Horizontal centrifugal pump is selected for air conditioning water circulation pump

Air conditioning water circulating pump The horizontal centrifugal pump runs smoothly: the concentricity of the pump shaft and the excellent dynamic and static balance of the impeller ensure stable operation without vibration.

No leakage: cemented carbide seals of different materials ensure no leakage of different media.

Low noise of air conditioning circulating pump: the water pump supported by two low-noise bearings runs smoothly, and there is basically no noise except for the weak noise of the motor.

Low failure rate: the structure is simple and reasonable. The key parts are matched with * quality, and the working time of the whole machine is greatly improved.

Easy maintenance: easy to replace seals and bearings.

Less land occupation: the outlet can be left, right and upward, which is convenient for pipeline layout and installation and saves space.

Application scope of air conditioning water circulating pump:

1. Air conditioning water circulating pump is used for conveying clean water and other liquids with physical and chemical properties similar to clean water, which is suitable for industrial and urban water supply and drainage

Water, pressurized water supply for high-rise buildings, garden sprinkler irrigation, fire-fighting pressurization, long-distance transmission, HVAC refrigeration cycle, bathroom and other cold and warm water circulation pressurization and equipment matching, with the service temperature T ≤ 80 ℃.

2. The horizontal hot water pump is widely used in: metallurgy, chemical industry, textile, papermaking, hotels and restaurants, etc. boiler hot water pressurization and circulation transmission and urban heating system, with the service temperature T ≤ 120 ℃.

3. Horizontal chemical pump, which is used to transport liquid without solid particles, corrosive and with viscosity similar to water, suitable for petroleum and chemical industry

Industrial, metallurgical, electric power, paper, food and pharmaceutical, synthetic fiber and other departments, the use temperature is - 20 ℃ ~ + 120 ℃.

4. Iswb type horizontal pipeline oil pump is used to transport gasoline, kerosene, diesel and other oil products or flammable and explosive liquids. The temperature of the medium to be transported is

-20～ +120℃。
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How to isolate vibration of underwater pump

For the installation of submerged pumps, especially the newly installed pumps, vibration isolation measures must be taken, and laziness is not allowed, otherwise great vibration and noise will occur during use. When the underwater pump is running, the noise is large, which will damage the equipment and cause noise pollution. Therefore, vibration isolation must be done. How can the underwater pump achieve the effect of vibration isolation?

1. The vibration isolation elements shall be symmetrically arranged according to the central axis of the underwater pump unit. The plane arrangement of the rubber vibration isolation pad can be arranged clockwise or counterclockwise.

2. When rubber vibration isolator is used for vibration isolation installation of non sealing liquid underwater pump unit, steel frame should be set under the base of the pump unit and installed by anchor; Foundation bolts are set in the ground or floor, and the rubber vibration isolator is fixed on the ground or floor after passing through the foundation bolts.

3. Rubber vibration isolation pads are arranged in single layer. If the frequency ratio cannot meet the requirements, multi-layer series arrangement can be adopted, but the number of vibration isolation pads should not be more than five.

4. When the rubber vibration isolation pad is set in series, the steel plate shall be flat, and the vibration isolation pad and the steel plate shall be bonded with adhesive. Rubber vibration isolation pads bonded on the upper and lower layers of galvanized steel plate shall be staggered.

Attention should be paid to these aspects in the design, manufacture, use and maintenance of the submerged pump. Only by following the requirements can vibration and noise be reduced and equipment damage be reduced.

Improvement of mechanical seal of submerged pump

The mechanical seal of the submerged pump has a pair of end faces perpendicular to the rotation axis. Under the action of fluid pressure and compensating for the mechanical external force, the end face of the submerged pump maintains contact with the other end through the cooperation of the auxiliary seal and slides, so as to avoid fluid leakage.

The mechanical seal of the submerged pump is the cause of the rare leakage of the submerged pump. When using the mechanical seal of the submerged pump, various factors of using the mechanical seal of the submerged pump shall be analyzed, so as to ensure the temporary and reliable operation of the mechanical seal.

The shaft end face of the moving ring seal ring of the device and the end face of the sealing gland of the static ring seal ring of the device shall be chamfered and polished to avoid damaging the dynamic ring seal ring during disassembly.

The mechanical seal of the submerged pump is a fine component with high requirements, which has high requirements for design, machining and disassembly quality. When using the mechanical seal, this ensures the temporary and reliable operation of the underwater pump seal.
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Alignment method of horizontal centrifugal pump

Centrifugal pump alignment method, pump alignment method

The purpose of horizontal centrifugal pump alignment is to make the center line of the water inlet and outlet of the horizontal centrifugal pump and the pump axis line completely consistent with the corresponding center line planned during the concrete foundation pouring of the horizontal centrifugal pump, so as to be consistent with the motor or diesel engine.

Take the horizontal double suction centrifugal pump as an example to align the centrifugal pump: take the vertical and horizontal center lines as the standard, draw a mutually vertical intersection center line in the air above the horizontal centrifugal pump equipment, hang two vertical lines on the two lines, and move the horizontal centrifugal pump so that the center line of its inlet and outlet coincides with the vertical line hanging on the axis. See the following diagram for the alignment method of centrifugal pump

During the alignment of the horizontal centrifugal pump, if it is found that the position of the anchor bolt hole is incorrect, or the size of the anchor bolt hole of the horizontal centrifugal pump and the drawing in the attached instruction manual are not aligned, the bolt hole is not aligned with the bolt, or there is no room for movement after alignment, then appropriate measures must be taken, such as increasing the anchor bolt hole of the pump, knocking the bolt, etc., to make the alignment deviation of the horizontal centrifugal pump not exceed the specified value.

The alignment method of single-stage single suction centrifugal pump is the same as the above method. It is OK to align the axis line. It should be noted that the outlet center of the single-stage centrifugal pump should meet the design outlet pipeline installation position
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Sewage source heat pump promotes energy conservation and environmental protection in China

The survey shows that the annual discharge of urban sewage in China can reach about 40 billion tons. With the acceleration of urbanization, the discharge of sewage will continue to increase. According to the experts, about 40% of the low-level waste heat in the city is in the potential urban sewage. The reasonable recovery of this part of low-level heat and the simultaneous recovery and utilization of the water and heat of urban sewage treatment not only realize the recovery and utilization of urban waste heat, turn waste into treasure, but also develop a new renewable and clean energy utilization mode, which opens up a new way for the recycling of urban sewage and low-grade clean energy, which can be said to achieve two goals with one stone.

The research shows that urban sewage has the characteristics of large water volume, suitable and stable temperature, small seasonal variation, warm winter and cool summer, so it can be used as a good low-level renewable energy. The primary sewage source heat pump uses urban sewage as a cold and heat source. According to the characteristics of sewage temperature higher than outdoor temperature in winter and lower than outdoor temperature in summer, the heat energy that is difficult to be directly used in sewage is extracted by heat exchanger, sent to the intermediary, and then transmitted to the heat pump host to form high-temperature water for heating in winter. This system can also be used in reverse for cooling in summer.

Winter heating in northern China depends on coal, oil and natural gas. Heating and environmental protection have become a pair of difficult contradictions. Urban sewage is a rare heat pump cold and heat source in the cold regions of the north. Its temperature is relatively stable all the year round. It is higher than the ambient air temperature in winter and lower than the ambient air temperature in summer. This temperature characteristic makes the sewage source heat pump operate more efficiently than the traditional air conditioning system, and the effect of energy saving and operation cost saving is remarkable. As one of the application forms of the ground source heat pump technology, the promotion of the original sewage heat pump technology is an effective way to change the current situation of the energy consumption structure in cities, which is mainly coal-fired, and it also opens up a new space for the application and development of renewable energy.

Experts introduced the operation mode of the sewage source heat pump air conditioning system, so that the ratio of energy input to output can reach 1:4, that is, the input of 1 kilowatt of electric energy can reach more than 4 kilowatts of heat, saving 30% - 75%. The heating fee is 70% compared with coal-fired heating, 50% compared with gas and 30% compared with oil. When heating, each ton of sewage can obtain 5000-10000 kW of heat energy, which is equivalent to the effective heating value of 1.5kg-3kg standard coal.

The sewage source heat pump system is a cold and heat source for heating in winter, air conditioning in summer and domestic hot water supply throughout the year. The boiler room systems such as coal, gas and oil are omitted for heating, and there is no combustion process, which avoids smoke exhaust pollution. The cooling tower is omitted for cooling, which avoids noise, mold pollution and air pollution of the cooling tower. Do not discharge any waste residue and wastewater into the atmosphere; The exhaust gas and soot have truly realized zero pollution and remarkable environmental benefits.

Under the current situation of global energy crisis and serious environmental pollution, the energy potential contained in urban sewage is huge and it is a clean energy that will not produce pollution. Therefore, the recovery and utilization of low-level energy in urban sewage not only helps to deepen people's comprehensive understanding of the recycling of urban sewage, realize the recycling of resources, turn waste into treasure, and fully reflect the concept of "developing circular economy"; Thus, it can greatly improve the energy utilization rate of the city, reduce the dependence of the city on fossil fuels, and have great practical significance for controlling air pollution, protecting the global environment and building an energy-saving city.

The successful implementation of many projects has proved that the use of primary sewage source heat pump system for heating and cooling has achieved an energy saving rate of 30% ~ 75%, which truly realizes zero emission and zero pollution, and does not discharge any waste gas, waste and waste residue into the atmosphere. Its investment and operation costs are also much lower than those of traditional methods. The vigorous development can save hundreds of millions of tons of coal per year, which will also reduce a large amount of greenhouse gas emissions.

Nowadays, the construction of green ecological civilization has become the focus of common concern of all walks of life. The sewage source heat pump system integrates many highlights such as energy conservation and emission reduction, low-carbon environmental protection, renewable and clean energy utilization, and lays a good foundation for the smooth progress of energy conservation and environmental protection in China.
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Why can't the magnetic pump idle? How to maintain?

Magnetic pump, also known as magnetic drive pump, is mainly made of engineering plastic or stainless steel. It plays an important role in the machinery manufacturing industry. Friends who have used the magnetic pump for a long time know that the magnetic pump cannot idle. Then, why can't it idle? Let's analyze it together today!

Prevent the magnetic cylinder from locking

If you have ever known the structure of the magnetic pump, you must know that the engineering plastic magnetic pump has a magnetic cylinder. What is the cooling of the magnetic cylinder? In fact, it depends on the medium of the magnetic pump. If the magnetic pump is idling, the normal state of the magnetic cylinder will be affected. It may cause the magnetic cylinder to lock, and then cause the magnetic pump to work abnormally.

Limited pump opening

If the magnetic pump wants to operate, it must be lubricated. So, how to lubricate? In fact, it depends on the medium of the magnetic pump. If there is no magnetic pump medium, the magnetic pump will face the problem of difficulty in starting the pump.

High temperature demagnetization

The design and working principle of the magnetic pump are related to the magnetic field, so we must ensure the stability of the magnetic field. When the magnetic pump is in the idle state, the temperature of its core components will rise, and the high temperature will have a certain impact on the magnetic field, and then cause demagnetization. In addition, you should know that the outer magnet assembly and the inner magnet assembly are the main components of the magnetic pump.

Why can't the stainless steel magnetic pump idle? After listening to the introduction of Xiaobian, I think you should have a clear idea. The above is the answer that Xiaobian will bring to you today. No matter what kind of magnetic pump, no matter what kind of equipment, it has a certain service life. If you want to extend the service life, you should timely maintain it in daily life. Then, how to maintain the magnetic pump? First, we should ensure that the magnetic pump is not cut off and there is no impurity in the magnetic pump. If the magnetic pump commits any of the above two taboos, it will cause certain damage to the bearing. Bearing is an important component of the magnetic pump. If it is affected, it will definitely shorten the service life of the magnetic pump. Second, we should pay attention to the proportion of liquid to be transported. If the proportion of liquid to be transported is too large, it will lead to insufficient lift. In addition, the impeller is damaged or there is a certain amount of air in the transmission medium, which also leads to this phenomenon. I hope you can avoid it as much as possible. Third, on weekdays, we should often check the suction pipe of the magnetic pump to see if there is air leakage. Especially when the magnetic pump cannot pump liquid, we should pay more attention to this problem.
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Magnetic pump is a common and widely used pump product. The steel used for the bearing of magnetic pump is high carbon chromium bearing steel. Because the smelting of high-quality bearing steel is through vacuum deoxidation and electromagnetic stirring, and the oxide content is small, it can withstand large contact pressure stress and high variable tensile stress at the same time. After heat treatment, the rolling track hardness of the shaft is 58-62hrc.

If the magnetic pump shaft has cracks or the surface has heavy wear, which will affect the strength of the centrifugal pump shaft, it should be replaced with a new shaft. If the pump shaft is slightly bent or slightly worn, and the hook is pulled, it shall be repaired. Then, what are the repair methods of the magnetic pump shaft?

1. Magnetic pump journal hook and repair after wear

For the pump shaft journal with sliding bearing, if the pump shaft journal is scratched or abraded due to poor lubrication or iron scraps and sand particles brought by lubricating oil, and the journal at the rubber guide bearing is worn, it is generally repaired by plating, copper plating and stainless steel plating, and then processed into standard diameter by car or grinding.

2. Repair of bending of magnetic pump shaft

For the pump shaft with small diameter, the bending part can be padded with copper sheet and straightened by hammering; Screw corrector can be used to straighten the pump shaft with larger diameter and less severe bending.

3. Repair of magnetic pump keyway

If the surface of the keyway is rough and the damage is not serious, it can be polished with a file. If the damage is serious, the old groove can be welded and a new groove can be opened elsewhere. However, the pump shaft with large transmission power must be replaced with a new shaft.

4. Repair of magnetic pump shaft thread

If the thread at the end of the pump shaft is slightly damaged, a mixed file can be used to repair the damaged thread and then continue to use. If the damage is serious, turn the pump shaft end down first, then press a bushing, and thread the bushing; Electric and gas welding can also be used to weld the threads at the pump shaft end, and then turn the threads.
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Centrifugal pump is composed of many parts. According to the working state of each part during operation, it can be roughly divided into three categories

Type: rotating part, fixed part J4: and handover part. Taking the single-stage single suction horizontal centrifugal pump as an example, as shown in Fig. 2.4, the function, composition, structure and material of each part are introduced.

1 impeller (also known as working wheel)

The drum is the main part of the water pump, and even the core part of the water pump. The centrifugal system relies on the high-speed rotation of the impeller

Water is used to realize energy conversion.

The N1 wheel rubber of the centrifugal pump is composed of two circular cover plates. There is a gap between the cover plates. 1: the bent blade will be two in front and back

The two cover plates are connected together, and the space groove surrounded by the two adjacent blades and the front and rear cover plates is generally called the flow of water.

(2) accumulated glaze

The beam rib is used to rotate the pump impeller. It receives power from the prime mover (motor) and drives the impeller to rotate. Thus, the pump

The shaft shall have sufficient torsional strength and rigidity, and its deflection shall not exceed the allowable value; The working speed cannot be close to resonance

The critical speed of the phenomenon. Common materials of pump shaft are carbon steel and stainless steel.

3. Key

The impeller and the pump rail are connected by keys. The chain is commonly known as the connecting piece of rotating parts. 3 in Fig. 2.4 is a centrifugal pump

The usually used flat key can only transmit torque and cannot fix the axial position of the impeller. In large and medium-sized fruits, the leaf

The axial position of the wheel is usually located by the shaft sleeve and the nut of the shaft sleeve.
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Does the stainless steel self-priming pump need a bottom valve?

Stainless steel self-priming pump

(1) Does the stainless steel self-priming pump need a bottom valve?

Generally speaking, there is no need to install a bottom valve. Generally, the inlet of the stainless steel self-priming pump is equipped with a check valve. After the stainless steel self-priming pump is shut down, the liquid in the pump chamber cannot return to the original pool, but is stored in the pump chamber. Therefore, there is no need to add liquid for the second use. However, it does not mean that the stainless steel self-priming pump cannot be equipped with a bottom valve. The effect will be better after the bottom valve is installed, Because if the one-way valve is damaged sometimes, there is still a bottom valve to ensure that there will be no idling, and the installation of the bottom valve will effectively ensure the effective suction of the pump!

(2) Stainless steel self-priming pump with bottom valve?

If the bottom valve is installed, the effect will be better, because if the one-way valve is damaged sometimes, there is still the bottom valve as a guarantee that there will be no idling, and the installation of the bottom valve will effectively ensure the effective suction of the pump! Another special case, however, if the suction height difference is too large, or the diameter of the suction pipe is too large, and the volume exceeds the liquid storage volume in the pump chamber of the stainless steel self-priming pump, it will not work normally. At this time, the bottom valve must be installed to ensure the safety and speed of self-priming.

Therefore, the stainless steel self-priming pump does not need to be equipped with a bottom valve, but it does not mean that the bottom valve can not be installed. After the bottom valve is installed, the suction range of the pump will be more guaranteed, especially for some small stainless steel Self-priming pumps, because the small stainless steel self-priming pumps generally do not have a one-way valve and rely on the vacuum generated in the pump body to achieve the self-priming effect, so the suction effect of the pump will be better after the bottom valve is installed!
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Effective methods to reduce cavitation of centrifugal pump

Methods to reduce cavitation of centrifugal pump

1、 Improving cavitation resistance of centrifugal pump

1. Method 1 for reducing cavitation of centrifugal pump

(1) Water pump with double suction impeller. NPSH due to double suction pump Δ HC ratio: NPSH of single stage single suction centrifugal pump Δ HC is small. For pumps with the same speed n and flow Q, double suction impellers shall be used as much as possible.

(2) Appropriately increase the impeller inlet diameter and increase the blade inlet width. When the impeller inlet diameter and blade inlet width increase, the impeller inlet speed and relative speed decrease, which shows that the critical NPSH of the pump decreases. However, at this time, the area of the leakage reduction ring at the impeller inlet increases, the leakage increases, and the volumetric efficiency of the pump decreases.

(3) An inducer is added in front of the impeller. An inducer is arranged in front of the impeller of the centrifugal pump. The inducer operates with the blades of the pump, and the pressure wheel produced by the inducer operates together after being coaxially assembled. The pressure generated by the inducer pressurizes the inlet of the impeller and improves the anti cavitation performance of the pump. However, the performance of the pump will be unstable if the inducer is added. Therefore, further exploration and research are needed.

2. In order to reduce the damage of cavitation to the flow-through parts of the pump and prolong its service life, materials with strong cavitation resistance are often used to improve the cavitation resistance of the flow-through parts. Such as cast manganese, bronze, stainless steel and alloy steel; Or coating or laser spraying the surface of the flow passage part with polymer to resist cavitation damage. In addition, finishing the surface of the flow passage part can improve its smoothness and reduce the harm of cavitation.
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How many meters can a common self-priming pump reach?

The problem of how many meters the suction range of the self-priming pump can reach is what the user wants to know before buying. At present, the suction range of the self-priming pump can reach 9 meters. The self-priming pump products with a suction range of 9 meters include vacuum assisted self-priming pump, domestic tap water self-priming pump and screw self-priming pump. The following is the information about these Self-priming pumps for your reference.

1. Domestic tap water self-priming pump

The commonly used domestic self-priming pump can suck within 9 meters of the suction range, and the self-priming time is within 3 minutes. The voltage of the domestic self-priming pump is 220V, the pump body is made of cast iron, and the impeller is made of copper, which can avoid the phenomenon that the cast iron impeller is rusted and causes the impeller to jam and pollute the water source, and can suck the hot water medium of about 40 degrees. Basically, this self-priming pump can only be used as a home, If it is used under other working conditions, the corrosivity of the liquid and whether the required flow head can meet your needs should be considered. If it can meet your needs, you can also choose this series of self-priming pump products.

2. Screw self-priming pump

Screw self-priming pump is also a domestic self-priming pump. Its main feature is high lift, which fills the disadvantage of low lift of ordinary domestic self-priming pump. The lift of screw self-priming pump can reach 130 meters The material is only cast iron, which is suitable for conveying clean water. The screw self-priming pump is also a self-priming pump with a suction range of 9 meters. Some merchants mark the suction range of 10-26 meters on the nameplate of the screw self-priming pump. In fact, this data refers to the horizontal distance. Many users regard it as the suction height and find that it can not be so high when they buy it back. Therefore, special attention should be paid.

3. Vacuum self-priming pump

The vacuum self-priming pump is an industrial self-priming pump. The flow of this series of self-priming pumps is more than 100 cubic meters. This series of vacuum assisted Self-priming pumps can not only be driven by motors, but also be driven by various brands of diesel engines. They can be installed on various mobile pump trucks for use as flood prevention and rescue pumps. Moreover, they can also use the open impeller structure to transport sewage media containing impurities. The pump body materials include cast iron, stainless steel, ductile iron and other metal products for users to choose, The vacuum system can be enlarged according to the user's requirements, so that the water at a distance of 9 meters can be sucked up within 30-60 seconds. The vacuum assisted self-priming pump can be allowed to idle for a short time. Therefore, the vacuum assisted self-priming pump is a kind of flood prevention and rescue pump product.
How to control the noise of electric ball valve?

As we all know, the magnetic pump cannot be idled. Otherwise, the pump head of the magnetic pump will be damaged. If it is serious enough, the magnetic pump will not work normally. So, how to avoid the magnetic pump idling? Why does the magnetic pump idle? In the following, the editor will tell you the answer.

Insufficient flow

First, if you want to avoid the magnetic pump idling, you must give the magnetic pump sufficient flow. Many situations may lead to insufficient flow of the magnetic pump, such as air leakage of the bottom valve or suction pipe, and low rotation speed of the magnetic drive pump itself. In addition, it is recommended to check the inlet and outlet. If there is some garbage and waste at the inlet and outlet, it will also lead to insufficient flow of the magnetic pump. According to the specific reasons, we should take corresponding solutions. Insufficient flow is one of the main factors causing the magnetic pump to run idle. I hope you can pay attention to it. In addition, I also want to emphasize that some magnetic pumps have been used for a long time, so their impellers will be severely worn, which will also affect the flow of the magnetic pump. In the process of inspection, we can also consider checking the impeller of the magnetic pump to see if it is the situation mentioned by the Xiaobian.

No water injection

Before using the engineering plastic magnetic pump, we must inject a certain amount of water into it to maintain the normal operation of the magnetic pump. Of course, some people are careless and always ignore this problem. Once water is not injected into the magnetic pump, it will make the magnetic pump idle. Empty transfer will cause great damage to the magnetic pump. We must pay attention to this.

Foreign matter stuck at the impeller

In the above, the small editor told you about the impeller. When reading this article, I hope you can distinguish it: what the small editor told you in the above is that the impeller is worn, and what I want to emphasize here is that there is foreign matter stuck in the impeller. If there are foreign matters stuck at the impeller, the working efficiency of the impeller will be reduced accordingly. At the same time, when the magnetic pump is working, we can also hear some noise that we could not hear before. In order to avoid idling of the magnetic pump, it is recommended that you carefully check the impeller to see if there is any foreign matter before allowing the magnetic pump to operate, and timely clean the garbage at the impeller in daily life.
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Comprehensive analysis of mortar pump of secondary structural column

Origin of secondary structural column pump: because the secondary structural column pump has complete functions and wide uses, it is a new type of secondary structural column delivery pump, pouring pump and feeding pump. I Product introduction: the secondary structure pouring machine is specially designed to solve the problems of labor-consuming, laborious and low production efficiency in the secondary structure construction. 3. The piston adopts imported raw materials, and the oil cylinder seal and key electrical components adopt imported components. 4. The layout of the secondary structural column hydraulic pouring pump is reasonable and the maintenance space is large. Rigorous research and invention, taking into account economy and reliability, good quality and low price. The secondary structural column pump is mainly used for indoor secondary pouring construction, consolidation grouting and backfill grouting works of construction projects. It is a very useful concrete equipment. Sometimes, the problem of pipe blockage will be encountered during use. Find out the cause of blockage and make reasonable solutions.

This kind of pump can improve the construction efficiency dozens of times. It is an indispensable part of the building. The next 20 years will still be the golden development period of small secondary structure concrete pump. However, market competition and industry competition will become more and more fierce. Enterprises with a certain scale and strength should improve their innovative thinking and innovation ability, especially to constantly improve the level of production and manufacturing modernization, enhance the competitiveness of enterprises in the industry and lead the development of the industry. The small secondary structure concrete pump is a new type of multi-functional construction machinery developed on the basis of absorbing advanced technologies at home and abroad. The product has a wide range of uses, and can be used for building mortar transportation, geotechnical engineering grouting, tunnel construction and large-area spraying. It is easy to operate, safe and reliable, easy to maintain, compact in structure and flexible in movement. This product adopts cam type rotation. Small secondary structural column fine stone conveying pump equipment is small in size, easy to move, economical and practical, and high in efficiency. It fills the blank of structural column pouring mechanization Mobile small-scale concrete delivery pump is a special equipment for structural column pouring. It is exquisite in design, convenient in movement, can be poured on the floor, simple in operation, convenient in use, time-saving and labor-saving. It is the preferred product for structural column pouring. It is suitable for high-rise fine aggregate concrete transportation and building floor group structural column pouring.

The cutting ring adopts the structure that can automatically compensate the gap. The control mode is electro-hydraulic control, with perfect electro-hydraulic overload protection and instrument display system; With reverse pump operation function, it is easy to eliminate the blockage fault; The pumping speed can be adjusted to meet the requirements of various working conditions. The centralized lubrication system automatically controls the start-up, stop and operation time by the program, effectively extending the service life of the rotating parts. (1) The use power of the pump is very small, only 22KW. In the case of no power supply, only one * small generator can work. (2) It is a small concrete delivery pump in China, and is the * choice for many narrow construction environments. (3) The pump is light in weight and easy to move. (4) The pump has high configuration, full hydraulic operation, stable performance, compact structure, low failure rate and long service life. (5) The pump is affordable. There are three configurations for customers to choose: Micro mortar pump, micro fine aggregate concrete pump and small concrete pump. (6) Equipped with variable radial plunger high-pressure pump, the pump delivery pressure is high. The product adopts hydraulic slurry feeding and double cylinder reciprocating operation of vibrating screen filtration, which is fully capable of conveying all kinds of mortar and fine aggregate concrete in building applications. The product has the characteristics of large displacement, high pressure, labor and material saving, flexible movement and so on. It is an ideal mortar conveying equipment. The secondary structural column pump can meet the different requirements of many users for the discharge speed; Advanced wireless function: improve the distance, facilitate the operation, and make the product more humanized; High wear-resistant concrete cylinder: it ensures and increases the service life of the concrete pump and reduces the maintenance cost of the user; The main cylinder with chrome plating on the inner hole of the new process avoids the problem of damage to the main cylinder due to dirty oil.
A Complete Solution To The Failure Causes Of Various Sealing Methods If Pump Happen Leakag

The self-priming sewage pump mainly includes inlet connecting pipe, one-way valve, outlet connecting pipe, pump body, impeller, mechanical seal, bearing seat and pump shaft. Double blade impeller structure is adopted to improve the dirt passing capacity. The mechanical seal adopts a new friction pair and operates in the oil chamber for a long time. Compact structure, small volume, low noise, remarkable energy saving effect, convenient maintenance and replacement. The automatic control cabinet can automatically control the start and stop of the pump according to the required changes. It does not need to be supervised by special personnel, and it is convenient to use. The installation method can be provided according to the user's needs, so that people do not need to enter the sewage pit during installation. It can be used within the design range to ensure that the motor is not overloaded. The pump is equipped with an outdoor motor and can be directly installed outdoors without building a pump room.

Maintenance skills of self-priming sewage pump:

First of all, check whether the parts are abnormal regularly. If there is any abnormality, refer to the instructions or other materials for inspection. If necessary, replace the parts. Check whether the pipeline and joint of self-priming pump are loose. Rotate the self-priming pump with hands or tools to see if the sewage pump is flexible.

Second, try to control the flow and head of the self-priming pump within the range indicated on the label to ensure that the self-priming pump operates at the highest efficiency point, so as to obtain the maximum energy saving effect.

Third, during the operation of the self-priming pump, the bearing temperature shall not exceed the ambient temperature of 35C and the maximum temperature shall not exceed 80C.

Fourth, if any abnormal sound is found in the self-priming pump, stop the pump immediately to check the cause.

Fifth, when the sewage pump is to be stopped, first close the gate valve and pressure gauge, and then stop the motor.

Sixth, when the self-priming sewage pump is not used for a long time and is used in the cold winter season, after shutdown, it is necessary to unscrew the drain plug at the lower part of the pump body to drain the medium. Prevent frost cracking (if it is sewage, please clean the pump chamber with clean water).

Seventh, when the self-priming sewage pump is not used for a long time, it should be cleaned and hoisted to a ventilated and dry place, and attention should be paid to anti freezing. If it is placed in water, it shall be operated for at least 30min every 15 days (dry grinding is not allowed) to check its function and adaptability.

Eighth, the cable shall be inspected at least once a year. If it is damaged, please replace it.

Ninth, carefully listen to whether the running sound of the motor is abnormal. Because the machine room is noisy during operation, you can listen to both ends of the motor with the help of auxiliary tools such as a screwdriver or a listening stick. If you listen regularly, you can not only find the bad vibration of the motor and its driving equipment, but also judge the amount of internal bearing oil, so as to make timely measures such as adding bearing oil or replacing new bearings, Prevent the motor bearing from being blocked due to lack of oil and dry grinding, running out of the outer circle and burning out during cleaning.

Tenth, after the operation of the self-priming sewage pump fails, please remove it according to the given troubleshooting method. If it still cannot be solved and the cause cannot be determined, do not dismantle or repair it without permission, and immediately find a special person to repair it.
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What are the working characteristics of concentrated sulfuric acid horizontal chemical pump?

At present, many enterprises begin to use concentrated sulfuric acid horizontal chemical pumps for the transportation of various materials. In the actual use process, this high-quality product has won high praise from many enterprise users. However, although many users often use this product, they still know nothing about the functions of the product. So let's take a look at the main working characteristics of the excellent concentrated sulfuric acid horizontal chemical pump?

1. Characteristics of good trafficability

The easy-to-use concentrated sulfuric acid horizontal chemical pump is very quiet during operation. Unlike other water pump products, it cannot achieve the purpose of transmission through internal rotating parts. Therefore, this product has good trafficability when conveying materials. It can pass through the diameter of materials to nearly one centimeter. At the same time, in the process of operation, its own wear is small and will not cause damage to the transported materials. It is especially suitable for transporting viscous sludge and has a short service life.

2. Strong self absorption

Because many users need strong suction to absorb materials when using concentrated sulfuric acid horizontal chemical pump, the manufacturer has specially strengthened the self-priming ability of the product when producing this product. This product has strong self-priming ability, and will not damage the pump body even if it is dry for a long time. Once the pump body exceeds the load, it will automatically stop working, with good self-protection function.

3. Features of high security

In recent years, the reason why the high-quality concentrated sulfuric acid horizontal chemical pump has been sincerely welcomed by many users is that the pipeline of this product is very spacious and suitable for conveying high viscosity products containing particles. At the same time, the concentrated sulfuric acid horizontal chemical pump has high sealing performance, will not pollute the environment when transporting volatile and corrosive substances, and has high safety.
pneumatic ball valve will affect the service life of the ball valve of air source quality

Common desulfurization pumps include fluorine lined centrifugal pumps, mortar pumps, stainless steel pumps, etc. the seals include mechanical seals, power seals, double face seals and packing seals, etc. What is the role of these seals?

1. Packing seal

Put the compressible and resilient packing into the stuffing box, and convert the axial compression force of the gland into radial sealing force, so as to play a sealing role. This sealing method is called packing sealing, and this packing is called sealing packing. Packing seal is widely used in pump design because of its simple structure, convenient replacement, low price, wide adaptability to speed, pressure and medium. When transporting normal temperature media, the packing seal is generally equipped with a packing ring, which is either connected with the high-pressure chamber of the pump or externally connected with a certain pressure of liquid media, which can play the role of cooling, lubrication, sealing or flushing.

As the packing seal is a contact seal, there must be friction and wear problems. The size of friction and wear mainly depends on the compression force of the packing gland. High pressure can improve the sealing effect, but it will increase the power consumption and wear of the shaft sleeve, otherwise it will produce large leakage. Therefore, the pressing force of the gland should be adjusted according to the leakage volume and the temperature of the leaking medium, and the packing should be replaced or supplemented if necessary. The reasonable leakage of packing seal is generally 10-20ml/min. When introducing liquid from the outside, it should be ensured that this liquid has good chemical stability, which will not pollute the medium delivered by the pump, nor react with the medium to produce sediment and solid particles. It should also have good impregnation and lasting retention with the filler, so as to have a good and lasting sealing effect.

2. Power seal

When the auxiliary impeller plus parking seal pump is running, the pressure head generated by the auxiliary impeller balances the high-pressure liquid at the outlet of the main impeller, so as to realize sealing. During shutdown, the auxiliary impeller does not work, so the shutdown sealing device must be equipped at the same time to solve the possible leakage during shutdown.

The sealing structure of the auxiliary impeller is simple, reliable, long service life, and no leakage can be achieved during operation. Therefore, it is often used in pumps conveying media containing impurities. The good sealing effect of the auxiliary impeller is conditional, that is, the working pressure is not allowed to exceed the allowable working pressure. Once exceeded, serious leakage will occur. The main reason for the change of working pressure is the pressure change at the suction port of the pump. Therefore, for the pump with auxiliary impeller seal, strict regulations must be made on the inlet pressure of the pump, otherwise the seal will fail. Due to many forms of parking seals, it is easy to find them after failure, so this article will not repeat it.
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Acid and alkali resistant self-priming pump can achieve the effect of exhaust and irrigation of inlet pipeline with the help of its own device characteristics without irrigation before starting. Self priming pump is divided into the following categories according to the action principle:

1. Gas liquid mixing type (including internal mixing type and external mixing type);

2. Water ring wheel type;

3. Jet type (including liquid jet and gas jet)

Working process of air-water mixed self-priming pump: due to the special structure of the self-priming pump body, after the pump stops running, there is a certain amount of water in the pump body. After the pump is restarted, due to the rotation of the impeller, the air and water in the suction pipe are fully mixed and discharged into the air-water separation chamber. The air and water overflow from the upper part of the chamber, and the water in the lower part returns to the impeller, and is mixed with the remaining air in the suction pipe again, until all the gas in the pump and suction pipe is discharged to complete self-priming

Self priming non clogging sewage pump is applicable to chemical, petroleum, pharmaceutical, mining, papermaking, fiber, pulp, textile, food, power plant and municipal sewage projects, sewage discharge of public facilities, pond aquaculture and other industries

The acid and alkali resistant self-priming pump flows in the direction of rotation. Then it combines with the water from the right return hole and flows along the volute As the liquid constantly impacts the cascade in the volute and is constantly broken by the impeller, it is strongly stirred and mixed with the air to generate a gas water mixture, which flows continuously, so that the gas and water cannot be separated. The mixture is stripped by the tongue at the volute outlet and enters the separation chamber along the short pipe In the separation room, the air is separated and discharged by the outlet pipe, while the water still flows to the outer edge of the impeller through the left and right return holes, and is mixed with the air in the suction pipe. Such repeated circulation gradually exhausts the air in the suction pipe, so that the water enters the pump to complete the self-priming process

Working principle of acid and alkali resistant self-priming pump:

Fill the pump casing with water before starting the pump (or there is water in the pump casing itself) After starting, the impeller rotates at a high speed to make the water in the impeller channel flow to the volute. At this time, a vacuum is formed at the inlet, so that the water inlet check valve is opened, and the air in the suction pipe enters the pump and reaches the outer edge through the impeller channel Self priming pump is a self-priming centrifugal pump, which has the advantages of compact structure, convenient operation, stable operation, easy maintenance, high efficiency, long service life, and strong self-priming capacity. There is no need to install the bottom valve in the pipeline, and it is only necessary to ensure that a certain amount of liquid is stored in the pump before work. Self priming pumps of different materials can be used for different liquids
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Maintenance of magnetic pump

Precautions before starting and operation of magnetic pump:

A remove the dirt around the machine and equipment that endangers the safety of the machine and equipment and the actual operating staff.

B before driving, fill the pump with the liquid to be transported (if the pump is sucking), open the inlet valve, close the outlet stop valve, and connect the power supply.

C. connect the power supply and check whether the rotation direction of the pump is appropriate.

D. the generator set shall be put into trial operation for 3-6 minutes. If there is no abnormal condition, funds can be put into operation.

F when starting up for the first time after long-term shutdown or pump maintenance, remove the cooling fan cover of the motor and manually switch it off, check whether the magnetic pump rotates flexibly, and install the cooling fan cover after confirming that there is no problem.

2. Normal shutdown of magnetic pump

First turn off the stop valve at the outlet, and then turn off the power supply.

3. Emergency braking

Stop the motor immediately, and then close the outlet valve and inlet valve.

4. Overhaul and maintenance of magnetic pump

Regularly maintain the pump and motor, and replace vulnerable parts.

When it is unnecessary to shut down for a long time, clean the flow passage in the pump with high pressure and disconnect the power supply.

No idling.

5. Common problems in the operation of magnetic pump

A pay attention to the pressure difference between the front, back, left and right of the suction end filter device. When the pressure difference rises, it means that the filter device is blocked by dirt, and the pump operation should be stopped to facilitate the cleaning of the coarse filter.

B. whether the discharge volume and working pressure meet the standard value; C. whether there is abnormal sound and vibration. If there is abnormal sound or vibration, it generally indicates cavitation or excessive bearing damage.

E. whether the pump produces cavitation: open the outlet gate valve of the pump. When the total flow reaches a certain amount, suddenly there is sound and vibration. At this time, amplify the gate valve again. If the total flow still does not increase, it indicates cavitation. In case of cavitation, the actual operation of exhaust pipe shall be carried out. Note: the magnetic pump must not run under cavitation conditions. If it runs again under such conditions, it will cause initial damage to the bearing.

F whether the current of the motor exceeds the rated voltage.

G. whether the temperature at each position of the pump is abnormally overheated.

H the working pressure of nitrogen pressure stabilization system shall be maintained within the required range.
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Function of centrifugal pump press out chamber

37. What is the function of centrifugal pump? How many forms of DP?

Answer: the function of screw pump press out chamber is to correctly guide the liquid with minimum loss

The next stage impeller may be led to the outlet pipe, and part of the kinetic energy is converted into pressure energy at the same time.

There are three common types of diaphragm pump press out chamber:

(1) Spiral volute is used to collect liquid gear pump. Kinetic energy becomes pressure energy

It is carried out in the diffuser.

(2) Radial guide vane, which is fixed outside the impeller outlet

The role of.

(3) Ring type press out chamber, used on segmented multi-stage pump*

38. What is the texture color given by centrifugal spring leaves 7

Answer: the impeller of centrifugal pump is generally made of metal, which enters according to the liquid flow

It can be divided into single suction PR force and double suction impeller, which are mainly composed of blade and wheel

The two-part 6-wheel is used to fix the blade and fix the calling wheel on the pump shaft-l.

39. What is the function of centrifugal spring coupling 7

Answer: the function of centrifugal pump coupling is to connect the pump shaft with the prime mover shaft

Play a role in transmitting the energy of the prime mover, buffering axial and radial vibrations, and

Automatically adjust the operation of the prime mover and the slave machine.

40. How many LP couplers are used?

Answer: there are three commonly used couplings:

(1) Rigid coupling, suitable for small, low-speed words with little vibration

On each;

(2) Elastic coupling is suitable for high-speed equipment with variable load,

(3) Gear couplings are mostly used on low-speed heavy equipment.
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Daily maintenance of high temperature heat transfer oil pump

1. Shutdown: cut off the power supply. Empty the liquid in the heat transfer oil pump, clean it, and rotate the impeller 180 degrees regularly to prevent shaft deformation until the oil pump cools down.

2. The heat transfer oil pump uses fuel with appropriate grade. Generally, No.0 diesel oil is used in summer and No.10 light diesel oil is used in winter.

3. The fuel used by the heat transfer oil pump shall be clean and free of any impurities and moisture. 4. It is normal to have a small amount of leakage at the beginning of the operation of the heat transfer oil pump. After time, the leakage will be reduced or stopped after the sealing surface runs in. Because the heat transfer oil pump shaft is equipped with a stuffing box at the front end, the sealing performance is relatively good, and at the same time, a mechanical sealing device is set in the bearing seat, so a large amount of leakage is impossible to occur, and a small amount of leakage can be discharged and received through the leakage pipe orifice.

5. The heat transferred from the transmission medium to the pump cover and bearing of the heat transfer oil pump is dissipated by the surface of the pump cover and bearing seat, so that the temperature of the bearing seat can adapt to the temperature of the shaft sealing performance. Therefore, when selecting the installation position of the heat transfer oil pump, the heat of the pump cover and bearing seat should be easy to diffuse without any heat storage.

6. Two ball bearings are set in the bearing seat. A ball bearing on the pump impeller side of the heat transfer oil pump is lubricated with the transmitted heat transfer oil, and a ball bearing on the coupling side is lubricated with high-temperature grease: after 3000 hours of operation, each ball bearing is removed and cleaned with diesel oil, and the contact surface is checked for damage. If it is damaged, replace it with a new bearing. When installing the ball bearing near the impeller side, the side with dust cover should be installed towards the impeller, and heat transfer oil should be injected for lubrication before startup. The ball bearing near the coupling side is lubricated with compound calcium base high temperature grease. When the bearing is reinstalled, the side with dust cover should also be installed towards the impeller side, and the grease should be filled during installation. After the bearing runs for 48 hours, use a grease gun to inject supplementary grease into the pressure injection cup on the bearing cover.
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What is a shaft seal free centrifugal pump?

1、 Overview of shaft seal free centrifugal pump

Shaft seal free centrifugal pump is also known as packing free centrifugal pump. It is usually a vertical canned motor or a horizontal canned motor, which is driven by a wet winding motor without a shielding pad.

In this case, the pump and motor share a pressure pump housing, and there is a heat shield between the pump parts and the motor parts. The heat shield can be active or passive. The allowable medium temperature is as high as 420 ℃

2、 Characteristics of shaft seal free centrifugal pump

The bearing is lubricated by discharging medium. In practice, there is no limit to the system pressure, because the total leakage rate is slightly higher than the mark, so it can be used for dangerous media or valuable media.

3、 Special form of shaft seal free centrifugal pump

The special form of shaft seal free centrifugal pump is designed according to the application purpose.

·Special impellers for liquid and gas mixtures or suspended solids

·Sealing system specially used for nuclear reactor technology or sealing system with protective gas gasket

·Heating device specially used for quick condensing fluid, such as hot water circulating pump

·Protective cover with abrasion protection
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large flow portable submersible pump for your reference:

Easily damaged parts: mechanical seal

Portable submersible pump oil chamber

The way to check in advance is to loosen the screw and check whether the oil level inside is full. If there is no oil inside, it is likely that an oil seal at the bottom is broken. If the oil seal is broken, it is recommended to return to the factory for maintenance and replacement. If there is still oil inside, please turn the pump upside down to let the oil inside out into a container and observe whether the oil contains water, If there is water in the oil, it means that the waterproof mechanical seal needs to be replaced.

The method to replace the waterproof mechanical seal is as follows: first remove the fixing screws at the water outlet of the submersible pump and remove the water outlet, then remove the impeller screws, find a rectangular wood, put one end on the bottom of the impeller, and use a hammer to knock down the upper end of the square wood with a hammer to lift the impeller down, and then remove the three bolts of the oil chamber cover plate and remove the cover plate to see the relevant parts of the mechanical seal, Before removing the mechanical seal, remember the installation sequence of the mechanical seal. It is recommended to take photos and archive them. After removing the old mechanical seal, install the new mechanical seal in the correct sequence, and then install the cover plate of the oil chamber according to the removal sequence, fill the oil chamber with transformer oil, and then install the impeller and water outlet.

Large flow portable submersible pump

To learn more about large flow portable submersible pump, recommended reading: Portable submersible pump

If you want to choose a self-priming pump and configure it on the power pump truck, it is recommended to read: large flow self-priming pump

If the delivered liquid contains a lot of impurities, it is recommended to choose stainless steel submersible pump for sewage
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Does the self-priming pump need to install a bottom valve?

The common self-priming pump refers to the external mixing suction and filtration self-priming pump. According to the rotation of the centrifugal impeller, the liquid flows into the volute, and then the pump shell generates a vacuum pump. In that way, the product of the self-priming pump will start, suck the liquid in from the inlet, and transport the liquid out according to the path of the impeller. It is the principle of the self-priming pump.

An obvious feature of self-priming pump different from centrifugal pump is that it does not need to inject water in the case of application. However, in the case of a single application, you must remember to inject water into the pump cavity. Because the pump shell itself does not store liquid, if you do not inject water in the case of a single application, the pump will rotate at a high speed, which will not only prevent the liquid from being sucked up, but also continue to burn the mechanical seal and other parts of the pump shell due to the high rotation speed. Therefore, you must pay attention to this.

So should the self-priming pump be installed with a bottom valve

01

If the bottom valve is not installed

What is the situation?

Generally speaking, there is no need to install the bottom valve. Generally, the inlet of the self-priming pump is equipped with a check valve, which is often referred to as this product, so after the pump is terminated, the liquid in the pump body cannot flow back to the original pool and be stored in the pump body, so there is no need to add liquid in the case of the second application,

02

If the bottom valve is installed

What about the situation?

If the bottom valve is refitted, the actual effect will be better, because sometimes if this product is destroyed, there is also a bottom valve as a guarantee, which is not easy to appear high speed, and after refitting the bottom valve, it will also reasonably ensure the reasonable suction lift of the pump!

Another special case, but if there is too much difference in the suction height width ratio, or the suction pipe is large, and the volume exceeds the liquid storage in the self-priming pump cavity, everything cannot work normally. At this time, it is necessary to refit the bottom valve to ensure the rapid safety of natural suction.
What is the liquid viscosity of acid resistant vacuum pump?

What are the common problems of diaphragm pump?

In essence, pneumatic diaphragm pump belongs to embolic pump, also known as control pump. There are four main combinations of it, which you can choose according to your personal needs.

Low flow

When you are faced with the problem of small flow of QBY pneumatic diaphragm pump, it is suggested that you consider these factors. First, check whether the inlet and outlet check valves of the diaphragm pump have been slightly worn. If the wear is serious, you must replace it in time. Otherwise, it will affect the normal operation of the diaphragm pump. Moreover, we need to check whether the inlet and outlet check valves are stuck by large particles. If it is stuck by large particles, the diaphragm pump will encounter certain difficulties in the process of suction, and discharge will also be abnormal to a certain extent. After finding the cause, we must solve it immediately to prevent affecting the work process and causing damage to interests.

There is no pressure at the outlet

Why is there no pressure at the outlet of the diaphragm pump? First, check whether the silencer of the diaphragm pump is blocked. If there is blockage, there is no way to discharge a large amount of gas in the diaphragm pump in a short time. In this way, the pumping speed is seriously affected, the speed is greatly slowed down, and there will be no pressure at the inlet and outlet. Second, it is recommended to check the upper and lower covers of the valve to determine whether the valve cover has air leakage or damage due to the impact of the valve core. Third, I hope you can pay attention to the inside of the pump. There is a central shaft inside the pump, and the central shaft has four sealing rings. If these four sealing rings are damaged, there will also be no pressure at the outlet of the diaphragm pump.

To sum up, this is the analysis of common problems of stainless steel diaphragm pump that Xiaobian will introduce to you today. In fact, to be honest, in addition to the above two problems, the diaphragm pump may sometimes not work.
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Why does the self-priming pump stop and then start without water?

Some users reported that in the process of using the self-priming pump, the water can be sucked up after the first filling, but the water can't be sucked up after the pump is stopped and then started. I don't know what the reason is. Let's analyze it below:

There are many kinds of self-priming pumps. The commonly used Self-priming pumps are ZX self-priming pump and ZW Self-priming sewage pump. There is a check valve disc at the inlet and the pump body is large, so this phenomenon is relatively rare. Some self-priming pump products, such as small stainless steel self-priming pump, have no check valve disc at the inlet, and the pump body is small. Some customers do not install the bottom valve at the bottom of the suction pool during the installation process. After stopping the pump, it is easy to backflow the water in the pump body back to the pool, so there is no water in the pump body when starting next time, Therefore, there is a phenomenon that water cannot be sucked after the pump is stopped. In this case, the problem can be solved by installing a bottom valve at the bottom of the water pipe, or installing a check valve at the inlet of the self-priming pump to prevent the water in the pump from flowing back.

Some users do not install a check valve in the vertical upward direction of the outlet pipe. After stopping the pump, the water in the outlet pipe will return to the pump body. If ZX and ZW Self-priming pumps are used, the water will also slowly return to the pool because the check valve disc at the inlet of the self-priming pump is not completely sealed. After stopping the pump for a long time, only part of the water in the pump body is left, and the water can be sucked up only when the pump is restarted.

Some of the outlet pipelines are very short. As a self-priming pump for temporary drainage, almost no valve is installed at the outlet. After the pump is stopped, because the water level in the pool is lower than that of the pump, the bottom valve is usually not installed in the installation of the self-priming pump, and no valve is installed at the outlet, so the air will be sucked into the pump body, and the water will flow back. If a valve is installed at the outlet, close the valve before stopping the pump, and the atmosphere cannot enter the pump body. The negative pressure formed before the self-priming pump will not be damaged, and it will be difficult for the water to flow back, and there will be no failure to suck water after stopping the pump.
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How to deal with the failure of mortar pump?

Mortar pump is a kind of pump that can adapt to various working conditions, such as conveying acidic and alkaline clear liquid or pulp

Various corrosive pulp in smelting industry; Various dilute acids in sulfuric acid industry; All kinds of sewage produced by environmental protection industry. The pump is corrosion-resistant, wear-resistant and widely used. However, we must also understand the common faults of mortar pump in various applications, and the common faults and solutions of mortar pump

1) : reasons for rapid wear and tear of the pump: poor construction conditions (large particles), long escort interval, long water inlet pipe. Treatment methods: change the battlefield, increase the pressurization device, shorten the length of the water inlet pipe, and reduce cavitation.

2) : reasons for rapid wear of impeller Journal: low head of high-pressure pump, wrong packing position, divergence between pump shaft and rear cover. Treatment method: replace the high-pressure pump higher than the head of mud pump, replace the packing and adjust the degree of alignment.

3) : cause of pump vibration: the pump shaft and diesel engine (or motor) are in different centers, the impeller is unbalanced, and the bearing is damaged. Treatment method: adjust the concentricity, conduct balance test on the impeller, and replace the bearing.

4) : reasons for low outlet pressure and flow: there is air in the pump, the gap between the impeller and the front cylinder liner is large, the separator is closed loose, and the impeller or cylinder liner is worn. Treatment: discharge the gas in the pump, adjust the clearance, adjust the clearance of the separator friction plate, and replace the impeller or lining plate.

5) : the reason for the slow water filling of the pump: the gap between the front lining plate and the impeller is large, the outlet pipe cannot seal the air, and the air is completely emptied. Treatment method: adjust the gap, adjust the outlet pipe and vacuum device.

6) : the reason why the pump does not absorb water: the water is insufficient, the air in the pump cannot be discharged, the suction pipe leaks, and the gap between the front lining plate and the impeller is too large. Treatment method: water continuously, check whether the pipeline leaks, and adjust the gap between the impeller and the front lining plate.
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Maintenance method of pipeline centrifugal pump

ISG single-stage single suction pipeline centrifugal pump adopts the performance parameters of is centrifugal pump, which is cleverly combined and designed on the basis of general vertical pumps. At the same time, according to the needs of users, it can be made into a high-temperature pump, which is suitable for conveying hot water, high-temperature corrosive chemical pumps and oil pumps.

Measures to be maintained during the use of the pump:

1. The pipeline is full of liquid, and it is forbidden to pump for a long time under cavitation condition;

2. Regularly check the current value of the motor, which shall not exceed the rated current of the motor;

3. After long-term operation of the pump, when the noise and vibration of the unit increase due to mechanical wear, the pump should be stopped for inspection, and the vulnerable parts and bearings can be replaced when necessary. The overhaul period of the unit is generally one year.

4. Mechanical seal lubrication should be clean and free of solid particles;

5. It is strictly forbidden to work the mechanical seal under the condition of dry grinding.

6. Before starting, the pump should be turned for several rounds to prevent the graphite ring from being broken and damaged due to sudden starting;

7. The allowable difference of seal leakage is 3 drops / minute. Otherwise, it should be checked.
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Why can't the pipeline pump fill water?

There are many pump products, even if it is the same pump, the model will be different. Different kinds of pumps have different effects, so there are pumps in many fields. Of course, we also know that the pump with the best quality will encounter some thorny problems. For example, in the process of using the pipeline pump, some friends will find that it suddenly can't fill water. Why? Let's analyze it today.

There is air in the water inlet pipe and pump body

When encountering the problem that the pipeline pump can't supply water, don't panic first. We should recall whether we poured enough water into the pipeline pump before starting it? Some pumps do not need to be filled with water before starting, while some pumps must be filled with water before starting. Pipeline pumps belong to the latter category. If there is insufficient water in the pipeline pump, a small amount of air will remain at the inlet pipe. In this way, the pipeline pump will not be able to pump water. Even if you are filled with water sometimes, the water may overflow from the vent hole. I hope you can pay more attention.

Packing wear

You can check your stainless steel pipe pump to see if there is a problem of packing wear. The packing of some pipeline pumps is seriously worn due to long-term use. If the packing is worn to a large extent, it will affect the normal operation of the pipeline pump, which will not only make the pipeline pump unable to fill water, but also cause other problems. At this time, it is recommended to replace the packing. In addition, if the packing is not worn, you should check whether the packing is too loose. Too loose packing will also cause the pipeline pump to fail to fill with water.

The installation screw cap is not tight

Are the mounting screws of your pipeline pump tightened? If it is not tightened, then hurry to solve it. If the installation screw cap is not tightened, it will cause water leakage or electric leakage of the pipeline pump. At the same time, the pipeline pump may not be able to pump water.

Although the pipeline pump is only one kind of pump, it involves a wide range of fields. What I'm going to introduce here today is only one aspect of the pipeline pump.
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Treatment of eccentric reducer at the inlet of corrosion-resistant centrifugal pump

As for the installation of the eccentric reducer on the inlet pipe of the end suction centrifugal pump (i.e. the pump inlet is a horizontal inlet), in the teaching materials related to the pump piping standards, it is stipulated that the eccentric reducing pipe diameter orientation on the horizontal pipe (whether the horizontal part is upward or downward) is determined by the absence of liquid bags or air bags (in two cases):

1. When the medium enters the pump from top to bottom, the bottom flat eccentric reducer is used for installation, and there is no liquid bag;

2. When the medium enters the pump from bottom to top, the top flat eccentric reducer is used for installation, and there is no air bag;

Generally speaking, it is "from top to bottom, from bottom to top" To understand this reason, first understand a knowledge point: cavitation phenomenon. Of course, if you only do industrial installation, you don't need to know so much, because there are complete and correct installation methods in the instructions of each pump manufacturer, and you only need to construct according to the drawings

1、 Cavitation phenomenon

Working principle of centrifugal pump: the driving machine drives the impeller to rotate through the pump shaft to generate centrifugal force. Under the action of centrifugal force, the liquid is thrown to the impeller outlet along the blade channel, and the liquid is collected through the volute and sent to the discharge pipe. The liquid gets energy from the impeller, which increases the pressure energy and speed energy, and relies on this energy to transport the liquid to the working place. When the liquid is thrown to the impeller outlet, a low pressure is formed at the center of the impeller inlet, and a pressure difference is generated between the liquid in the suction tank and the liquid in the impeller center. Under the action of this pressure difference, the liquid in the suction tank continuously enters the impeller through the suction pipeline and the suction chamber of the pump.

According to the working principle of the centrifugal pump, the liquid flow flows into the impeller under the action of the pressure difference (PA PK) formed between the suction tank pressure PA and the low pressure PK at the impeller inlet. The lower the pressure PK at the impeller inlet, the greater the suction capacity. However, if PK decreases to a certain limit value (at present, the saturated vapor pressure pt of the liquid at the transmission temperature is mostly taken as the critical value of the liquid vaporization pressure), cavitation will occur.

2、 Methods to improve the cavitation resistance of centrifugal pumps include:

A. Improve the pump structure and reduce Δ HR, it is a pump design problem.

B. Improve the effective NPSH in the device: the main common method is to use the filling head suction device.

In addition, try to reduce the resistance loss of the suction pipeline and reduce the saturated vapor pressure of the liquid, that is, when designing the suction pipeline, try to choose measures such as larger pipe diameter, shorter length, fewer elbows and valves, and lower temperature of the transmitted liquid, which can improve the effective cavitation allowance of the device.

Well, after understanding the above knowledge points, let's take a look. What is the role of big and small heads? It is used to change the size of pipe diameter. So what is the use of changing the size of the pipe diameter at the inlet and outlet of the pump? It is mainly to reduce the flow velocity of the medium in the pipe, so as to reduce the friction when the medium flows in the pipe.
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After purchasing the fluorine lined centrifugal pump, the knowledge about how to use the centrifugal pump is relatively lacking, and it is easy to damage the centrifugal pump. So it is necessary to know and master the knowledge about how to use centrifugal pump correctly. When using a centrifugal pump, after the power is connected, carefully observe the operation of the centrifugal pump. The water outlet should be continuous and uniform, and the centrifugal pump can be used only when there is no vibration and noise. In case of sudden shutdown during operation, immediately disconnect the power supply and check the cause. The interval between two starts of a centrifugal pump shall be limited to the return of all the water in the pump. If it is started too early, the motor will be burned due to excessive resistance and water hammer in the water pipe. In addition, if the centrifugal pump is installed in the well, it should be noted that the flow of the centrifugal pump should meet the normal water output of the well, otherwise it will cause the empty machine to run and burn the motor.

Precautions for installation and use of fluorine lined centrifugal pump

1. Before the operation of the centrifugal pump, use a megger to check the insulation resistance of the motor stator winding to the ground, which shall not be less than 50 megohms at least;

2. When the voltage of the water pump exceeds ± 10% of the rated voltage, the water pump shall not be started.

3. To ensure the safety of use, the grounding wire in the four core cable must be reliably grounded to prevent electric shock accidents.

4. When the centrifugal pump is used, it should be lifted vertically, and it is not allowed to stand on the ground vertically, let alone fall into the sludge. When the pump is out of use, it should be cleaned and placed in a dry place, and pay attention to antifreeze;

5. Check the running direction of the rotor. It should rotate clockwise from top to bottom;

6. Outdoor switches or terminals shall be provided with rain proof and moisture-proof measures. It is forbidden to touch the switch when wet hands or bare feet to prevent electric shock;

7. When moving the centrifugal pump, the power supply must be cut off, and people are not allowed to contact the water source when the electric pump is running, so as to prevent personal accidents caused by electric leakage;

8. It is strictly forbidden to operate the motor in phase failure. If the fuse is found to be blown, it should be checked before continuing to use. It is not allowed to thicken the fuse arbitrarily;

9. When the centrifugal pump is running, it should be managed by a specially assigned person. If abnormal phenomena are found, it should be stopped immediately for inspection and troubleshooting;

10. After the centrifugal pump operates normally for half a year under the specified working medium conditions, the sealing condition of the oil chamber should be checked. If the oil in the oil chamber is milky or there is water precipitation, the mechanical oil and mechanical seal should be replaced in time. The water pump used under bad working conditions should be overhauled frequently;

11. The user should choose the appropriate flow head according to the actual working conditions to achieve the use effect. It is forbidden to use over flow, otherwise the motor will be overloaded if the flow is too large and the head is too low.
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How to deal with the blockage of sewage pump? Cold water should be used to cooperate with solvent for cleaning. If the blockage is relatively serious, the human resources will be connected after the pump body is disassembled and disassembled. Frequent disassembly of the pump will accelerate the damage of relevant components of the pump mouth ring. Therefore, it is necessary to avoid blockage as much as possible. In the process of operation, the following common problems can be used to reduce the blockage of the sewage pump.

After knowing how to deal with the blockage of the sewage pump, it is very necessary for the operators of machinery and equipment to apply appropriate maintenance methods to reduce the probability of blockage of machinery and equipment. As long as it is a sewage pump with qualified quality, there is very little blockage when solving the wastewater matching the specifications. The blockage is usually caused by the untimely daily maintenance. For example, if the pump is not cleaned immediately after the wastewater with high liposuction viscosity, the material will inevitably solidify over time, causing the centrifugal impeller of the pump to be stuck and blocked.

In order to better reduce this situation, customers must formulate timely maintenance and repair plans according to the application of sewage pumps and well-known brands, so as to lubricate the grease on time and ensure the actual effect of the lubrication of machinery and equipment. At the same time, the internal parts such as gear rack, centrifugal impeller, rolling bearing, piston rod, etc. should be inspected, the brittle or seriously damaged parts should be replaced immediately, and the hydraulic machine should be cleaned. In addition, before using the sewage pump and placing it for a long time, it must be operated in the sewage well for several minutes to achieve the actual effect of high-pressure cleaning of the pump chamber.

On the whole, the operators should be more concerned about how to deal with the problem of sewage pump blockage. It is generally proposed to assign full-time personnel to supervise and manage the sewage pump in the whole process, and regularly maintain the winding resistance of the submersible pump and the grounding resistance in the middle of the shell. Every 400 hours, the automobile oil in the grooves is removed and replaced up and down, especially the value traceability of the sealing ring between the centrifugal impeller and the pump housing. If it is a deep submersible sewage pump, it must be removed from the water in the future when it is not easy to reuse, so as to reduce the opportunity of motor rotor winding resistance and moisture return.

After the detailed introduction of the above content, I firmly believe that you also have a detailed understanding of how to deal with the blockage of the sewage pump. You only need to select the sewage pump with matching characteristics according to the specific working conditions and transported substances, and the blockage condition is very rare
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