Precautions for selecting asphalt pump

The diaphragm inside the asphalt pump is also made of nitrile rubber, neoprene, fluororubber, polyvinylidene fluoride, polytetraethylene hexaethylene material I according to different liquid media. The selection of asphalt pump shall be considered from the following aspects:

(1) The shape and structure of the valve core are mainly considered according to the selected flow characteristics, unbalanced force and other factors.

(2) When the fluid concentration is high, the valve seat surface will be seriously damaged by friction. Therefore, the flow path of the valve should be smooth and the internal material of the valve should be hard.

(3) As the medium is corrosive, the valve with simple structure shall be selected as far as possible under the condition of meeting the regulation function.

(4) Temperature and pressure of the medium when the temperature and pressure of the medium are high and change greatly, the valve with small temperature and pressure change of the material of the valve core and valve seat shall be selected.

(5) Prevent flash and cavitation. Flash and cavitation are only produced in liquid medium. In the actual production process, flash and cavitation not only affect the calculation of flow coefficient, but also form vibration and noise, which shortens the service life of the valve. Therefore, when selecting the valve, flash and cavitation should be prevented.

2、 Overview of asphalt pump: the asphalt pump is composed of actuator and valve. Using compressed air as the power source, all kinds of corrosive liquids, liquids with particles, high viscosity, volatile, flammable and highly toxic liquids can be pumped and absorbed. It is suitable for various occasions to pump media that cannot be pumped by conventional pumps. Asphalt pump actuators include pneumatic actuators and electric actuators, with models of QBY pneumatic asphalt pump and DBY electric asphalt pump respectively. There are four materials for the main body (valve body) of asphalt pump: plastic, aluminum alloy, cast iron and stainless steel, which are selected according to the requirements of liquid or gas medium. The diaphragm inside the asphalt pump is also made of nitrile rubber, neoprene, fluororubber, polyvinylidene fluoride and polytetraethylene hexaethylene according to different liquid media, so the media type shall be specified when ordering.

3、 Specific selection method of asphalt pump:

The action mode of asphalt pump is selected. The action mode of asphalt pump is only available when the pneumatic actuator is selected. Its action mode is formed by the combination of the positive and negative action of the actuator and the positive and negative action of the valve. There are four types of combination, namely positive (gas off type), positive and negative (gas on type), negative (gas on type) and negative (gas off type). The asphalt pump action modes formed by these four combinations include gas on and gas off. The selection of asphalt pump action mode is mainly considered from three aspects:

(1) Process production safety;

(2) Characteristics of medium;

(3) Product quality and small economic loss.
Liquid ring vacuum pump used in wind tunnel test

Principles to be followed when using gear oil pump

When using gear oil pump, we will encounter many faults, and the causes of these faults are also different. According to the troubleshooting methods of gear oil pump production over the years:

(1) Add or change the required engine oil at the specified oil level in season. Take out the foreign matters in the oil pipe and tighten the bolts or nuts at the joint

(2) Replace the aged or damaged skeleton oil seal or "O" seal rubber ring;

(3) Replace the worn gear oil pump or oil pump shaft sleeve. When the wear is slight, grind the end face flat on the plate. The allowable error of unevenness is 0.03mm; The end face of the upper shaft sleeve is lower than the upper plane of the pump body (the normal value is lower than 2.5 ~ 2.6mm). If it is poor, the lower shaft sleeve shall be added with 0.1 ~ 0.2mm copper sheet to compensate. During installation, it shall be installed on the rear shaft sleeve;

(4) Only when the unloading plate and sealing ring are installed into the oil chamber can the two shaft sleeves maintain balance. The sealing ring of unloading plate shall have 0.5mm preload;

(5) The elastic force of the guide steel wire shall be able to twist the upper and lower shaft sleeves by a small angle towards the rotation direction of the driven gear at the same time, so as to make the processing planes of the two shaft sleeves of the driving and driven gears closely fit;

(6) The unloading groove on the shaft sleeve is installed on one side of the low-pressure cavity to eliminate the harmful dead volume during gear meshing;

(7) Before pressing in the self tightening oil seal, apply a layer of lubricating oil on its surface, and pay attention to the oil blocking edge towards the front cover, which cannot be installed reversely;

( The "right-hand" pump cannot be installed on the "left-hand" machine, otherwise the skeleton oil seal will be damaged;

(9) Pour a small amount of engine oil into the pump housing and install it into the pump housing by hand;

(10) Before installing the oil pump cover and tightening the bolts, check whether the distance between the pump cover and the pump body is between 0.3 ~ 0.6mm. If it is too small, replace the sealing ring and pressure relief part. After the hydraulic oil pump is installed, it shall rotate flexibly without jamming.

This is the principle we follow when using gear oil pump.、
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What are the characteristics of wear-resistant multistage centrifugal pump

Design principle of wear-resistant multistage centrifugal pump: the existing multistage centrifugal pump generally adopts the unitary theory design for conveying clean water. For the multistage centrifugal pump used in coal mine, our company adds the design theory of two-phase flow to increase the suction performance and hydraulic design of the pump, which increases the suction head of the pump and reduces the impact wear of coal and water in the pump, It can convert energy, so as to increase the efficiency of the pump and increase the service life of the pump.

The wear-resistant multistage centrifugal pump is a segmented horizontal multistage pump, the suction port is horizontal and the discharge port is vertical upward. The water pump is directly driven by the prime mover through the coupling. Viewed from the end of the prime mover, the pump rotates clockwise and is mainly composed of stator, rotor, bearing and shaft seal:

1. The stator part is mainly composed of suction section, middle section, discharge section, guide vane, etc. each section is clamped with tensioning bolts to form a working chamber.

2. The rotor part is mainly composed of shaft, impeller, balance disc and shaft sleeve. The shaft transmits power to the impeller to make it work; The balance disc is used to balance the axial force; Both ends of the shaft are equipped with replaceable shaft sleeves to protect the shaft.

3. There are two kinds of bearings: rolling bearing and sliding bearing: rolling bearing is mainly composed of bearing body, bearing and bearing gland, which is lubricated with grease. The sliding bearing is mainly composed of bearing body, bearing cover, bearing bush, dust disc, oil level gauge, oil slinger, etc. it is lubricated with thin oil.

4. The shaft seal adopts packing seal, which is mainly composed of the water inlet section and the sealing box body on the packing box body, packing and water retaining ring. Seal the liquid in the working room and play the role of water seal, water cooling and water lubrication.
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Heat preservation pump high viscosity heat preservation pump

1. Title: insulation pump high viscosity insulation pump NYP insulation pump delivery notice

2. Key words: magnetic insulation pump no leakage insulation pump insulation pump manufacturer magnetic drive gear pump asphalt insulation pump

3. Mode of transportation: the whole machine is packed in wooden cases and has been delivered through deppon logistics. The order number has been sent to the customer's mobile phone. Please check it at any time.

4. Remarks:

NYP high viscosity heat preservation pump is composed of inner and outer rotors, shafts, pump bodies, front covers, brackets, seals, bearings, etc. The sealing mode of the heat preservation pump has two forms: mechanical seal and packing seal. If it is a medium with high temperature, high viscosity and strong corrosivity, packing seal can be selected. When the heat preservation pump transports easily crystallized materials, a heat preservation jacket can be designed on the front cover and the pump body, which can be insulated and melted by steam during operation. It rotates clockwise when viewed from the extended end of the main shaft to the pump.

The heat preservation pump is especially suitable for the transportation of high viscosity media. NYP high viscosity heat preservation pump can be used to transport heavy oil, asphalt, glue, resin, detergent and other objects
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I hope you can understand the three taboos of using submersible pump

Any equipment has a service life. The length of service life is not only related to the quality and performance of the equipment itself, but also related to people's use specifications. If we do not use the equipment according to the conventional requirements, the service life of the equipment will be shortened. Today, Xiaobian will introduce you to the three taboos of submersible pump. I hope all readers in front of the screen can cheer up and have a good understanding of this content.

Do not rotate in the opposite direction

Submersible pumps are divided into single-stage pumps and multi-stage pumps. According to common sense, the single-stage pump with lower head and the multi-stage pump with higher head. In the process of using single-stage pump, it is recommended to distinguish the direction. Although the submersible pump can discharge water whether it is positive or negative, it is recommended that you turn forward rather than reverse. In case of reverse rotation, the motor winding may be damaged. And to be honest, when the single-stage pump of submersible pump is in the reverse state, the water output is still relatively small, so it is better to turn forward. In addition, a warm reminder. I hope you can check carefully before pumping the single-stage submersible pump into the water to see if the rotation direction of the single-stage submersible pump is abnormal. If it is abnormal, it should be adjusted in time. After it is normal, it can be put into the water.

Do not overload operation

Whether it is people or equipment, as long as they work overload, it will cause certain damage to themselves, and so will the stainless steel submersible pump. Xiaobian told you above that the head of single-stage submersible pump is generally small, so for those work fields that need high head submersible pump, single-stage submersible pump can not be used. If you have to use a single-stage submersible pump, you should pay attention to it in the process of use, so as to prevent the current value from exceeding the normal range and burning the equipment.

High frequency start

You know what? When the single-stage pump of the submersible pump is closed, the submersible pump will produce backflow. At this time, if you press the start button to make the submersible pump work, it may cause damage to the motor and make the motor load start. After the motor load starts, the starting current will become large. To a certain extent, it will inevitably cause various problems in the equipment. At the same time, shorten the service life of the equipment. Therefore, when using submersible pumps, we must not make taboos in this regard. According to common sense, if you want to start the submersible pump and single-stage pump again, it should be at least five minutes apart.
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Characteristics of spiral centrifugal pump

A key part of the spiral centrifugal pump is its unique spiral centrifugal impeller, which has both spiral section and centrifugal section. It combines the advantages of non clogging of the spiral pump of the traditional centrifugal pump, so it is called spiral centrifugal pump. The spiral centrifugal pump originated in Switzerland and is designed to help Peruvian fishing plants transport live fish from fishing boats. Relying on the non blocking and soft transportation characteristics of the spiral centrifugal impeller, the pump can transport live fish from the fishing net to the ship and then from the ship to the processing plant intact. With the increasing development and improvement of products, the application field of spiral centrifugal pump is gradually expanded. Compared with ordinary impurity pump and swirl pump, the structure of spiral centrifugal pump determines that it has the following characteristics:

1) No blockage, good performance

The large channel formed by the blade, coupled with the role of inlet guidance and spiral propulsion, can transport the liquid containing large particles and fiber materials, especially the long fiber objects can pass smoothly. The solid concentration transported is higher than that of other types of non clogging pumps. Compared with the traditional centrifugal impeller with similar outer diameter, the diameter can be greatly improved.

2) Soft conveying and good non-destructive performance

The solid-liquid two-phase fluid is gradually pushed forward under the action of balanced helical force, and there is no sudden change in the flow direction, so the flow is balanced. In the sludge treatment process, it is suitable for conveying sludge and can maintain the characteristics of sludge.

Screw centrifugal pump

3) High efficiency and wide area

4) Flat power curve

5) Characteristic curve with steep drop

When the head changes, the flow changes little, which can ensure continuous and stable operation.

6) The suction performance of the pump is good

The pump blade extends forward to the suction port, so it can pump the gas containing medium. When a trace of gas is inhaled, the performance, vibration and noise of the pump basically do not change. When the gas content exceeds 40%, the pump can still operate despite intermittent vibration.

7) High solid content
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Centrifugal pump commissioning method and precautions

Centrifugal pump test method and precautions for centrifugal pump test

The installation of centrifugal pump should be completed in advance according to the following items when the centrifugal pump and centrifugal pump are installed

1. Before starting the centrifugal pump, it is forbidden to run the pump with no-load and no-load. The test run with liquid shall be carried out according to the operating procedures specified above in the operating instructions of the centrifugal pump. For the forced lubrication system, the temperature rise of the bearing oil of the centrifugal pump shall not exceed 28 ° C and the temperature of the bearing metal shall be less than 93 ° C.

2. For centrifugal pumps with oil ring lubrication or splash lubrication system, the temperature of lubricating oil shall not exceed 39 degrees, and the temperature of bearing parts shall be less than 82 degrees.

3. When testing the centrifugal pump, the vibration value of the bearing of the centrifugal pump should also be checked. The vibration standard of the bearing of the centrifugal pump can refer to the vibration standard of relevant Petrochemical rotating machinery.

4. During the test run of the centrifugal pump, the operation of the centrifugal pump should be very balanced and noise free, the coolant and lubricating oil system should be normal, and the centrifugal pump and auxiliary pipelines should be free of leakage.

5. During the commissioning of the centrifugal pump, it should be noted whether the current of the centrifugal pump motor operates within the specified range. If the overcurrent indicates that the actual working condition head is lower than the pump head, it is recommended to turn down the outlet valve to control the flow of the centrifugal pump so that its current can be used within the rated current range.

6. The leakage of various seals and media of centrifugal pump shall not exceed the requirements of the following standards:

(1) Clean water centrifugal pump with mechanical seal: light oil 10 drops / min, heavy oil 5 drops / min

(2) Multistage centrifugal pump with packing seal: light oil 20 drops / min, heavy oil 10 drops / min

(3) For the magnetic drive pump conveying toxic, harmful, flammable and explosive media, no obvious leakage is allowed.
dry screw vacuum pump of rotor profile type

What common problems should be paid attention to in the selection of sewage pump?

What are the common problems of sewage pump selection? The blowdown pump is a kind of pump which is connected with the motor and intrudes into the underwater work together. Compared with the usual vertical pump or vertical sewage pump, the blowdown pump has compact structure and small total area. Convenient installation and maintenance. Large and medium-sized sewage pumps are usually equipped with automatic coupling equipment, which can carry out automatic installation. Installation and maintenance are equivalent to convenience. Long running time.

Because the pump and motor are coaxial, the shaft is short and the rotating component is very light, the load (axial) borne on the bearing depends on the small, and the service life of the sewage pump is much longer than that of the usual pump. There are no problems such as cavitation damage and water filling. The latter ones are very convenient for the use staff. Low vibration noise, low motor leakage current, green environmental protection for the bad environment.

Type selection FAQ 1. Find out the bad environment of pump application and select the appropriate type of pump (usually wet test and dry test).

2. Calculate the required water pressure of the pump. Occasionally, customers calculate the flat transportation distance as the water pressure, which is incorrect. After the flat transportation distance is multiplied by the friction resistance, it can be calculated into the water pressure.

3. The damage of pipe bends and pipeline friction must be measured. In fact, this is all different. It is inconvenient to measure. Therefore, it is proposed to leave some space to ensure that the pump can get water.

4. If you choose a stainless steel sewage pump, you should also find out the pH value of the water body, including particle diameter, and choose a suitable metal material. Generally, 304 material is suitable for pH4 ~ 10. Beyond this scope, 316 or 316L stainless steel is proposed.

5. The pumping machine must be applied within the rated water pressure range to ensure that the motor has only load. For example, the specific required water pressure is 30m, but the pump with the standard water pressure less than 30m should be used for pumping. This situation should be an incorrect instruction, which will lead to the load of the motor. In serious cases, the motor will be burned.

6. The pump pipeline must be connected. If the pipeline is blocked, it will lead to motor load, and the motor can be burned under serious conditions.
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Several precautions for installing stainless steel self-priming pump should be kept in mind!

The stainless steel self-priming pump has made more changes in function and material in order to discharge gas more smoothly in the self-priming process, and it is also easy to connect the exhaust pipe or valve. However, special attention should be paid during installation to ensure that there will be no instability during operation.

1. Pay attention to stability

In order to ensure that the service life of the pump is increased when it is directly connected with the motor. Therefore, when installing and correcting, you must ensure that the installation of the whole pump is stable, including its pump shaft and motor output, which should be on the same shaft degree.

2. Firmly installed

When the stainless steel self-priming pump is running, the power is very strong. In order to ensure that the equipment can be used stably, it must be firm between various lock nuts during installation, so as to avoid mechanical failure caused by impeller movement.

3. Storage solution left

Although this kind of machine pump does not need to be filled with water, in order to avoid the occurrence of dry friction inside the machine, we must ensure that a certain amount of stored liquid is stored in the pump body.

4. Pipeline installation

In order to ensure that this kind of pump can complete a good self-priming process, the maximum height of its suction inlet must not exceed 5m. At the same time, the suction port must be used with the support, so as to reduce the load borne by the pipeline. Of course, there must be no solid sundries in the pipeline, and the filter surface should be checked regularly.

5. The axial deviation shall be controlled within 0.1mm

When installing between the shaft device and the shaft device, the maximum deviation of its shaft degree must be controlled, otherwise once the height difference deviates too much, it will lead to instability during the operation of the self-priming pump.
water ring vacuum pump unit of usage of working fluid

The sewage pump with mixing is very noisy

The sewage pump with mixing device is mostly used to suck sewage pits with more particles, such as slurry water in industrial production and urban underground sewage pits. The mixing device can float and discharge the precipitated foreign matters. Compared with the traditional sewage pump, it has higher treatment efficiency and medium overcurrent. However, recently, some customers have reported that the sewage pump with mixing device is very noisy, EVP pump industry provides relevant solutions.

The automatic mixing sewage pump is a submersible sewage pump. Although the mechanical operation itself will produce a certain amount of noise, because the operation is carried out under the liquid and the noise cannot be transmitted to the ground too much, the noise perceived by human beings should be limited. If the noise is unbearable in the actual process of using the pump, it is recommended to put forward the pump and carry out the following maintenance and treatment.

1. First check the pipeline system, mainly to ensure that the pipeline has a separate support frame, and all connections are fastened without looseness. If necessary, install damping devices to alleviate the noise caused by vibration;

2. Confirm the historical maintenance records of the sewage pump and check whether anyone has changed the factory structure and configuration components of the pump. Some users will modify the pipe size of the sewage pump to make the flow meet the transportation standards. This behavior will lead to the imbalance of water absorption and output, resulting in severe noise and shaking. If it is really necessary to change the configuration and internal structure of the sewage pump under special transportation conditions, it is recommended to contact the manufacturer and arrange professional technicians to implement it;

3. In addition to the behavior of modifying the pump structure by themselves, some users also replace the supporting motors of the original factory. Some newly replaced motors may have poor performance or mismatch with the pump power, resulting in unstable current during operation, pulse and noise.

The above content briefly introduces the relevant reasons and treatment measures for the high noise of the sewage pump with mixing. Such matters can be avoided in the actual process of using the pump, which only requires the operator to pay more attention. If you want to know more pump information such as screw pump and multi-stage pump, you are welcome to continue to pay attention to EVP pump industry.
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Benefits of using diaphragm pumps

The advantage of using diaphragm pump is that it is easy to install and use, and there is no need to monitor the operating parameters at all times. It can operate without fault for a long time, and there is no excessive vibration and noise interference in the process of use. It is a reliable new type of high-performance pump. Because of its wide versatility, it can have good adaptability even if the working conditions change. It is a high cost-effective transportation pump.

Diaphragm pump is a new type of pump, which overcomes many shortcomings of traditional water pump. For the benefits of using diaphragm pump, please refer to the following points.

1. It can be used away from the motor. There are no potential safety hazards such as electric leakage in flammable and explosive fields. It is easy to carry and can be used in various remote areas;

2. Idling for a long time does not generate heat and does no damage to the pump. There is no need to arrange special personnel to monitor. Due to the light volume, the vibration during operation is also very slight;

3. With reliable comprehensive performance, it can dive, self absorb, prevent leakage, transport chemical liquid, and transport viscous liquid like screw pump;

4. The installation of pneumatic diaphragm pump does not need foundation and does not occupy too much space. If necessary, it can be directly immersed in liquid for use;

5. High safety, no crash, overclocking or overload caused by overload operation, self-protection function, simple and convenient operation in daily use;

6. It can be customized. EVP pump's pneumatic diaphragm pump products support a variety of pump materials such as engineering plastics, stainless steel, cast iron and alloy for different transportation conditions;

7. The internal structure of the pneumatic diaphragm pump has been optimized and can be used for a long time without worrying about wear. However, the diaphragm is a consumable and it is recommended to check it regularly.

After understanding the benefits of using diaphragm pump, it should be noted that pneumatic diaphragm pump is limited by air source pressure, and the pump pressure of most models and specifications can only reach 6bar. If there is higher demand for flow, pressure and other parameters, electric diaphragm pump can be considered. If you have special transportation needs, you can also contact EVP pump industry in advance to customize the pump body.
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What are the common control methods of centrifugal pump flow?

At present, there are four flow control methods of centrifugal pump widely used in the market: outlet valve opening adjustment, bypass valve adjustment, impeller diameter adjustment and speed control.

Common flow control methods of centrifugal pumps and their influence on energy consumption

1. Outlet valve opening adjustment

The opening of the outlet valve is adjusted, and the pump is connected in series with the outlet pipeline regulating valve. Its actual effect is like using a new pump system. The maximum output head of the pump does not change, but the flow curve attenuates. Adjust the opening of the outlet valve, and the energy consumption is 94%. When the flow is low, the power consumption is large.

2. Bypass valve regulation

In this method, the valve and pump are connected in parallel. Its actual effect is like using a new pump system. When the maximum output head of the pump changes, the characteristics of the flow curve also change, and the flow curve is closer to linearity. For bypass valve regulation, the bypass valve reduces the pump head to 55m, which can only be achieved by increasing the pump flow. As a result, energy consumption increased by 10%.

3. Adjust impeller diameter

This method does not use any external components, and the flow characteristic curve changes with the diameter. After adjusting the impeller diameter and reducing the impeller diameter, the output flow and pressure of the pump are reduced, and the energy consumption is reduced to 67%.

4. Speed control

The change of impeller speed directly changes the flow curve of the pump, and the characteristics of the curve remain unchanged. When the speed decreases, the curve becomes flat and the head and maximum flow rate decrease. Through speed control, the speed is reduced, the flow and head of the pump are reduced, and the energy consumption is reduced to 65%.

1) Total efficiency of pump system

Both outlet valve regulation and bypass regulation methods will increase the pressure loss of the pipeline and greatly reduce the efficiency of the pump system. The adjustment of impeller diameter has little effect on the efficiency of the whole pump system. As long as the speed is not less than 50% of the normal speed, the speed regulation control mode basically does not affect the system efficiency.

2) Energy consumption level

Assuming that the output flow of the pump is adjusted from 60m3 / h to 50m3 / h through the above four methods, the power consumption when the output is 60m3 / h is 100% (at this time, the pressure head is 70m)
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What are the precautions before installation of mixed flow pump?
The mixed flow pump will be installed after you buy it, but how to install it to ensure its normal use is also a very important thing. In fact, it is also a technical activity in the installation process. So there will be a lot of things to do before. Next, let's talk about the precautions.
When you take back the mixed flow pump from the manufacturer, you should find a technician to install it. Before installation, all equipment shall be checked box by box according to the packing list, and then the appearance and quality of the equipment shall be checked when unpacking. When doing this, if you find any problems, contact the manufacturer in time to solve them for everyone. Under normal circumstances, there is not much problem. If so, it's also a small problem. If there are any defects, please contact the manufacturer and ask them to repair or repair them as soon as possible. Of course, you can also change a new one directly. Then we have to prepare all the tools and equipment. There are many tools and equipment you need to be special. These experts should know.
In addition, when installing the mixed flow pump, the master should be familiar with the structure and technology of the host, and these basic knowledge needs to be understood. You should also be familiar with safety precautions. Also, pay attention to the determination of the unit centerline and elevation. At this time, the building provided by the civil contractor can be used to determine its center. The elevation of the impeller center of the main engine shall be consistent with the elevation of the design drawing. Also check whether the embedded iron parts and reserved anchor bolt holes of the civil contractor meet their requirements. These are important things. I hope you will pay attention to them.
The above contents are some matters needing attention before installing the mixed flow pump. If you are engaged in this job, you can have a good understanding. If you want to know about other aspects, you can go to the website for consultation, and the technicians will answer for you. If you need to order, you can also contact us directly. After all, this is a company specializing in the production of mixed flow pumps, which ensures that you can buy products with high cost performance. I hope these contents can help more people.

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What are the filling methods of single-stage centrifugal pump

There are two main water filling methods before the start-up of single-stage centrifugal pump: one is to fill water by assembling the bottom valve, which is a one-way valve installed at the inlet of the inlet pipe. The disadvantage of this method is that the head loss of the bottom valve is large, which affects the device efficiency of single-stage centrifugal pump; The other is water filling without bottom valve. The advantage of this method is energy saving. Compared with the pump station with bottom valve, it can save energy by 10% ~ 15%.

Manual water filling method: for small pump stations with inlet pipe diameter less than 300mm, a bottom valve is usually set at the inlet of the inlet pipe. Generally, manual water filling method is adopted, that is, water is filled by a water filling funnel (or an inverted ordinary bottle with bottle bottom removed) from the special water filling exhaust hole on the upper part of the pump shell. For small pump stations with inlet pipe diameter less than 300mm, a bottom valve is usually set at the inlet of the inlet pipe, and the pump can also be filled with water from the outlet pipe orifice of the pump (pump station with short outlet pipeline). Because there is no need to buy other water filling equipment, this water filling method is more common in small rural pumping stations

Self diversion and water filling method: for the pump house with semi submerged type (i.e. the pump station with the elevation of the inlet pipe and the pump top below the water surface of the inlet pool), the water can be introduced into the pump by itself without manual irrigation and water diversion. The disadvantage of this pump station is that it does not make full use of the water absorption capacity of the pump, and the installation elevation of the pump is reduced, which not only increases the excavation of the foundation, but also inconvenient operation and management; But the advantages are also obvious, that is, it is easy to realize the automation of the pump station and has strong timeliness

Vacuum water tank filling method: for small pump stations without bottom valve, vacuum water tank filling method can be adopted. The vacuum water tank is a closed water tank welded with iron sheet, and its volume is three times that of the inlet pipe. The installation position of the water tank should be as close to the water pump as possible, and the bottom height of the water tank should also be slightly lower than the axis of the water pump. The height of the vacuum water tank is generally twice the diameter of the water tank.
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Reasons for lower head of sewage pump

Classification of sewage pumps: submersible sewage pump, pipeline sewage pump, self-priming sewage pump, submerged sewage pump and slurry pump

(1) Impeller passage blocked

If part of the flow passage of the impeller is blocked, it will affect the work of the impeller and lead to the decrease of outlet pressure. Therefore, the pump needs to be removed for inspection and removal of foreign matters. In order to prevent this problem from happening again, if necessary, a filtering device can be added in front of the pump inlet.

(2) Internal leakage

When the clearance between the rotating part and the stationary part in the pump exceeds the design range, it will lead to internal leakage, which is reflected in the decrease of the discharge pressure of the pump, such as the clearance between the impeller port ring and the interstage clearance of multi-stage pump. At this time, corresponding disassembly and inspection shall be carried out, and the parts causing excessive clearance shall be repaired or replaced.

(3) Cavitation at inlet

If the suction pressure of the pump is too low, which is lower than the saturated steam pressure of the pumped medium, cavitation will be formed. At this time, check whether the inlet pipeline system is blocked or whether the opening of the inlet valve is too small, or increase the liquid level of the suction pool.

(4) Speed reduction

The important factors affecting the pump head are the outer diameter of the impeller and the speed of the pump. When other conditions remain unchanged, the pump head is in positive proportion to the quadratic power of the speed. It can be seen that the speed has a great impact on the head. Sometimes if the speed of the pump is reduced due to some external reason, the pump head will be reduced accordingly. At this time, check the speed of the pump. If the speed is not enough, check the cause and solve it reasonably.

(5) The operating point deviates to large flow and low head

Generally, centrifugal pumps have a continuous downward performance curve, and the flow increases gradually with the decrease of head. In the process of operation, due to some reason, the back pressure of the pump decreases, and the working point of the pump passively shifts to the point of low head and large flow with the curve of the device, which will reduce the head. In fact, this is caused by external factors such as the change of the device, which has no special relationship with the pump itself. At this time, the problem can be solved by increasing the pump back pressure, such as closing the outlet valve a little.
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Common faults of self-priming pump

① No response after power on. Most of them are caused by short circuit of power plug, power outgoing line and motor winding.

② , difficult to start or unable to start, accompanied by "buzzing" sound. During maintenance, small bamboo can be used to quickly move the fan blade according to the running direction. If the motor runs quickly, it indicates that the starting capacitor or starting winding is damaged. Replace the capacitor with the same capacity or repair the starting winding; If the motor is stuck, it is mostly the mechanical failure of the motor and pump head, such as bearing damage, impeller jamming, etc.

③ The motor can run, but the speed is slow, and the casing is overheated and has a burning smell. Most of them are caused by short circuit of motor winding. The motor shall be disassembled and repaired by welding, jumper, isolation, rewinding and other measures according to the damage.

④ Large noise and vibration during operation. In most cases, the bearing is damaged or the fit between the bearing and the casing is improper. The motor needs to be disassembled for inspection. If the bearing is damaged, it should be replaced; If the bearing runs out of the outer circle, the matching surface of the pump shell can be chiseled; If the bearing runs inside the circle, the worn parts of the motor shaft can be chiseled. If the wear is serious, the method of surfacing first and then turning shall be adopted for repair.

Our self-priming pump products include: ZW Self-priming sewage pump, ZX self-priming (clean water, chemical) pump, zcq stainless steel self-priming magnetic pump, zcq-f fluoroplastic self-priming magnetic pump, ZBF self-priming plastic magnetic pump, fzb fluoroplastic self-priming centrifugal pump, WFB unsealed automatic self-priming pump and CYZ self-priming centrifugal pump
Roots vacuum pump and maintenance of exhaust filter element of treatment of vacuum drop

Do you know the classification of self-priming sewage pump-- ZW Self-priming sewage pump

Sewage pump is a kind of pump product which is connected with pump and motor and works underwater at the same time. Compared with general horizontal pump or vertical sewage pump, sewage pump has compact structure and small floor area. The installation and maintenance are convenient. Large sewage pumps are generally equipped with automatic coupling devices, which can be installed automatically. The installation and maintenance are quite convenient.

According to different sewage discharge modes, sewage pumps can be divided into Self-priming sewage pump, submerged sewage pump, knife type sewage pump and automatic mixing sewage pump. The vertical sewage pump adopts a unique single blade or double blade impeller structure, which greatly improves the sewage passing capacity, and can effectively pass through the fiber material 5 times the diameter of the pump and the solid particles with a diameter of about 50% of the diameter of the pump. The vertical sewage pump, which can be moved or fixed, is used for the sewage, suction and discharge in construction, farmland drainage and irrigation, enterprises and institutions. In addition to conveying sewage, it is also suitable for drainage pump, pulp pump, irrigation, etc.

However, the self-priming sewage pump can also be classified according to the action principle, which can be divided into the following categories:

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

Working process of gas-liquid mixed Self-priming sewage pump: due to the special structure of the pump body of the self-priming sewage pump, there is a certain amount of water in the pump body after the pump stops running. After the pump is started again, due to the rotation of the impeller, the air and water in the suction pipeline are fully mixed and discharged to the gas-water separation chamber. The gas in the upper part of the gas-water separation chamber overflows and the water in the lower part returns to the impeller, Re mix with the remaining air in the suction pipeline until all the gas in the pump and suction pipe is discharged, complete self suction and pump water normally.

2. Water ring wheel type

The water ring wheel type self-priming sewage pump combines the water ring wheel and the water pump impeller in a shell to discharge the gas with the help of the water ring wheel to realize self-priming. When the pump works normally, the passage between the water ring wheel and the pump impeller can be cut off through the valve, and the liquid in the water ring wheel can be discharged.

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

The jet type self-priming sewage pump is composed of a centrifugal pump and a jet pump (or ejector). It relies on the injection device to create a vacuum at the nozzle to realize suction.
EVP's Dry Chlorine Liquid Ring Compressor

Why does fluoroplastic self-priming pump absorb water very slowly

Self priming pump is a centrifugal pump that can automatically pump water up without filling the suction pipeline with water. There are many structural types of fluoroplastic self-priming pump.

Generally speaking, the structure of fzb self-priming pump adopts self-priming structure, the pump body adopts metal shell lined with fluoroplastic, all flow-through parts are made of fluoroplastic alloy, the pump cover and impeller are made of metal insert wrapped with fluoroplastic, sintered and pressed as a whole, the shaft seal adopts external advanced bellows mechanical seal, and the static ring adopts 99.9% alumina ceramic (or silicon nitride), The moving ring is made of Teflon filling material, and its corrosion resistance, wear resistance and sealing performance are very stable.

Fzb fluoroplastic self-priming pump sometimes experiences slow water absorption during use. Here are the reasons and solutions:

1. When the fluoroplastic self-priming pump is used for the first time, the pump body needs to be filled with liquid to absorb water normally. If the pump cavity is not filled with water, resulting in water shortage in the pump control, there is air in the pump cavity that needs to be discharged by the self-priming pump, which will greatly prolong the water filling time of the self-priming pump, Therefore, the pump control must be filled with liquid to make the self-priming pump water quickly.

2. Air leakage may not be found in the suction pipe of the self-priming pump, such as weak air leakage at the pipe joint, flange joint and quick joint joint joint, which may be the reason for the slow water filling and rotation of the self-priming pump, Therefore, before installing the pipeline, both ends of the pipeline must be completely sealed, and then pressurize or pump negative pressure to test whether the pipeline has air leakage points, and then install the fixed pipeline after confirmation, If the pipeline has been installed, the method to check the suction leakage point of the self-priming pump is to fill the self-priming pump with liquid and turn it on for 5-6 minutes, then stop the machine, and then close your ears to the place where the leakage is suspected, listen to whether there is a whistling sound, find the leakage point and repair it.

3. The self-priming height of fzb self-priming pump is about meters. Due to the error between the self-priming height published by some manufacturers and the high bottom of the actual self-priming pump, it will lead to the difficulty of filling water for the self-priming pump after the user is installed according to the standard of more than 3m during installation and use. In this case, you can consider replacing the high suction pump, The suction pipe diameter of the pump can also be reduced, which can effectively improve the self-priming height of the self-priming pump. After reduction, the outlet should also be reduced by one grade, but the flow will also be reduced.

4. Due to the fierce competition in the market, many manufacturers have made the self-priming pump body relatively small, so the cost will be reduced. After the pump body is small, there will be little liquid stored by the self-priming pump, and the self-priming capacity of the self-priming pump itself will be very general. At the same time, they do not consider optimizing and upgrading the self-priming performance, which will reduce the self-priming capacity of the self-priming pump, Therefore, you will find that this kind of self-priming pump with small pump body has very low self-priming capacity, and it is likely to add water again every time in use.

5. Due to the design problems of some self-priming pump products, the steam water separation speed is very slow and the separation effect is poor. It is difficult to feel the gas discharged from the exhaust valve of the self-priming pump in the process of self-priming and exhaust, which indicates that the steam water separation effect of the self-priming pump is not good.

6. The reason for the slow suction of the self-priming pump may also be that the user has changed the diameter of the suction pipe of the self-priming pump during installation and use, making the diameter larger. Due to the larger diameter, there will be more air in the pipe and reduce the suction of self-priming. For example, sucking a small suction pipe and a large suction pipe with a mouth clearly feels that the suction of the small pipe is large.
What is the material of rotary vane of rotary vane vacuum pump? Is it fiberglass or carbon fiber?

Causes of high noise of water injection pump

The water injection pump vibrates and makes large noise, which is caused by pump evacuation, cavitation or mechanical failure.

(1) The pump is not vented before starting or the air in the pump is not completely vented;

(2) The impeller and inlet pipeline support are not fixed firmly and the filter screen is blocked, resulting in insufficient water supply;

(3) The connection part at the inlet end of the pump or the sealing packing is not tightly sealed and has air leakage;

(4) The bearing bush is seriously worn and the clearance is too large;

(5) The pump displacement is controlled too large or too small, causing cavitation or pump suffocation;

(6) Impeller damage or vibration caused by rotor imbalance;

(7) The pump shaft is bent or the pump shaft is not concentric, resulting in mutual friction between the rotor and stator;

( The balance disc is seriously worn and fails, resulting in excessive axial thrust;

(9) The foundation bolt is not fixed firmly, which makes the motor vibrate and then causes the pump vibration, or the construction, design and installation quality is unqualified;

(10) The coupling is not concentric, the connecting bolt is loose or the damping rubber ring is damaged, resulting in imbalance and non vibration absorption.
EVP VACUUM NEW OIL FREE SCROLL VACUUM PUMP ON THE MARKET

Fluoroplastic magnetic pump

Fluoroplastic magnetic pumps are widely used in various fields of national economic construction, such as petrochemical industry, mining, metallurgy, electric power, water conservancy, national defense, farmland irrigation and drainage, urban water supply and drainage, etc. Because ordinary magnetic pumps are cast parts, they are generally delivered after simple grinding at the factory. The fluid surface of the pump is rough, and the resistance of the fluid in the pump is too large, which will increase the shaft power of the pump and cause a waste of energy. In addition, due to the different operating environment of the pump, the flow-through parts of the pump, such as impeller and shell, will be infringed to varying degrees, and the impeller will fall off and damage in the form of groove and honeycomb, which will affect the operating efficiency of the pump. Therefore, it has far-reaching social benefits to improve and maintain the efficiency of water pump and reduce energy consumption.

Yuanxiang pump valve fluoroplastic magnetic pump

1. Fluoroplastic magnetic drive pump has the advantages of stable and reliable performance, good sealing performance, beautiful appearance, convenient use and maintenance, etc. It plays a great role in improving product quality, reducing running, emitting, dripping and leakage, preventing pollution and improving the environment.

2. It is suitable for extracting corrosive liquid from bottles, barrels, cylinders, pools or other containers.

3. It is suitable for chemical, petroleum, metallurgy, power station, food, pharmaceutical, synthetic fiber and other departments to transport corrosive media with temperature of various ℃ or media with high physical and chemical properties.

4. Suitable for pumping clean water, containing abrasive substances harmful to ordinary pump body materials, suspended substances corrosive to stainless steel materials and non explosive substances; At the same time, it is widely used for water supply.

5. Suitable for heating, air conditioning, cooling and circulation systems, fire fighting, irrigation, rainwater storage engineering, daily use, civil, horticultural and industrial purposes;

6. Suitable for occasions where low noise is necessary;

7. It is suitable for pressurization and conveying corrosive and explosive water or liquid
If you want the dry screw vacuum pump to have a long service life, these 12 maintenance points should be done in place

Analysis of asphalt insulation pump in use

Article source: unknown editor: screw pump Author: screw pump publication time: November 10, 2011 10:49 font size: [large, medium and small]

It is often encountered in practice that the head of asphalt insulation pump is lower than that of the design working point. One situation is that the pump head is too high in pump selection, but the pump is used with lower head in actual use; Another situation is that the operating point of the pump is not easy to determine in use. In other words, the flow of the pump needs to be adjusted frequently; There is also a case that the pump needs to be used in different places frequently These three conditions may overload the pump and affect the reliability of the pump It can be said that the application range of pumps without full head characteristics (including submersible sewage pumps) will be limited to a great extent

The non overload design technology of asphalt insulation pump is used in different fields and plays an important role and value in the industry. The following briefly introduces the use of asphalt insulation pump in the industry and uses it according to the corresponding ways and methods to ensure the good use value and function of asphalt insulation pump in use

In the general centrifugal oil pump, the power always increases with the increase of flow, that is, the power curve is a curve rising with the increase of flow, which will bring a problem to the use of asphalt insulation pump: when the pump runs at the design working point, the power of the pump is less than the rated power of the motor, and the use of this pump is safe; However, when the pump head decreases, the flow will increase (as can be seen from the pump performance curve) and the power will increase When the flow exceeds the flow at the design operating point and reaches a certain value, the input power of the asphalt insulation pump may exceed the rated power of the motor, resulting in motor overload and burning When the motor is overloaded, either the protection system acts to stop the pump; Either the protection system fails and the motor burns out
Roots vacuum pump unit of treatment of high current

What are the common tools for repairing vacuum pump?

1、 Common tools

1. One set of general fitter tools;

2. Box wrench, socket wrench and Allen wrench set;

3. Special oil drill - for pulling and inserting rubber pipe;

4. Cutter holder - for rounding rubber washer;

5. Rubber knife - draw a straight rubber block and cut a rubber tube (it can be ground with a saw blade);

6. Punches - various punches are used to punch screw holes of rubber pads;

7. Crank winch - several crank winches can be self-made to wind leaf springs, and the diameter is selected according to the inner diameter of the spring;

8. Scissors and blade;

9. Three "0" large flat plates;

10. Others: including camera, brush, brush, various emery abrasives, coarse and fine metallographic sandpaper, etc.

2、 Auxiliary oil, soluble Vitex and chemical reagent

1. Gasoline, alcohol, acetone, benzene and other solvents;

2. Castor oil - for taking and inserting vacuum rubber tube, lubrication and auxiliary sealing;

3. Kerosene - thickened and refined valve sand is used as abrasive;

4. Shellac paint solution - auxiliary seal;

5. Vacuum sealing grease, vacuum sealing wax and other sealants;

6. Caustic soda - for boiling and washing vacuum rubber.

3、 Instruments for metering and leak detection

1. Micrometer (micrometer), caliper (vernier card), angle ruler ("grade 0&quot, marking ruler, depth ruler, dial indicator, etc.

2. High frequency spark leak detector, thermocouple meter, ionization meter (or combined vacuum meter), Michaelis meter, etc.

3. Helium mass spectrometer leak detector and pumping speed test device can be prepared if possible.
The relationship between absorbed power and shaft power of the motor

What if the vacuum degree of imported vacuum pump is low?

During the operation of the imported vacuum pump, sometimes the vacuum degree of the imported vacuum pump is low. So, how can we find out the cause of the problem and solve the problem? Let's take a look:

1、 Air leakage of inlet vacuum pump

1. The sealing ring leaks. Check the sealing condition of all seals and replace damaged sealing rings. 2. The gasket of ballast valve is damaged or not tightened. The gasket should be replaced and the ballast valve tightened. 3. The exhaust valve is damaged and the seal is not good. The valve plate should be replaced. 4. The diaphragm is pressed too much, and the vacuum pump chamber is deformed and leaking. The vacuum pump chamber should be repaired or replaced. 5. Air leakage is caused by poor oil seal on the end face of the imported vacuum pump. Remove the end cap, check for sundries or unevenness, and clean or repair it.

Imported vacuum pump

2、 There is a problem with the imported vacuum pump oil. 1. The oil level of the inlet vacuum pump is too low. The center line of the oil standard shall be filled with enough oil. 2. The engine oil is polluted and deteriorated. The oil should be replaced with a new one. 3. The brand of oil does not match. Replace the vacuum pump oil of the specified brand. 4. The oil circuit is blocked and an appropriate amount of oil is not maintained in the vacuum pump chamber. Check the oil circuit and the oil inlet of the oil valve to keep the oil circuit unblocked.

3、 The inlet filter screen of the inlet vacuum pump is blocked. The filter screen shall be removed and cleaned before installation.

4、 The rotor spring of the imported vacuum pump is deformed or broken, and the rotor fails. The spring deformation shall be repaired or replaced so that the rotor product is in good contact with the rotor.
The Mechanical seal pump and the gland packing seal pump can be directly interchangeable sealing mode ?

Do you know the anti foaming property of vacuum pump oil

When the vacuum pump is working, air bubbles always cause bubbles, especially when there are active additives in the oil, and the foam is not easy to disappear. The use of foam in smooth oil will destroy the oil film, not only cause the friction surface to attack or increase wear, but also cause the oxidation of smooth oil to undergo metamorphosis. The gas in the operating vacuum system is discharged from time to time in the sealed vacuum pump oil layer. The discharged gas will generate a large number of bubbles on the surface of the oil layer and overflow from the exhaust hole of the vacuum pump, resulting in oil loss and equipment pollution. The pump oil with anti foaming agent has made obvious progress in anti foaming effect.

Confirmation of seals:

(1) Confirm whether the installed seal is the same as the required model.

(2) Before installation, carefully compare with the general assembly drawing to see if the number of parts is correct.

(3) For mechanical seals with parallel coil spring drive, the spring can be divided into left and right rotation, which must be selected according to the rotation direction of the rotating shaft.
How to resolve the corrosive medium problem in the vacuum pump?

How to distinguish the quality of vacuum pumps on the market

Through news reports, we learned that many people just bought vacuum pumps, which soon had problems such as oil leakage and belt cracking. In terms of losses, the amount is not large, but the problem is very serious. Here, Xiaobian can only say that fake and shoddy products are rampant. In the past, when we didn't have data, we couldn't judge whether it was quality or operation. However, a large number of data show that the quality of vacuum pumps on the market is worrying. Some products are not energy-saving, but whether they can be used.

Many people know the brand very well and pay too much attention to the price without considering the product quality, function and product parameters. If you use dim sum a little, you can know the product quality problem of vacuum pump.

Absence of market supervision. The supervision, testing and supervision of products on the market are relatively poor. Many counterfeit products have not been seized and cannot be managed at all. After the revocation of the production license of the compactor, this phenomenon may be more, which requires the joint efforts of enterprises, shopping malls and occupations to eliminate the fittest.

There is fierce competition among vacuum pump peers. It is not only reflected in digging customers, talent, comparing prices and selling scripts, but also in the search for product quality and the protection of orderly career development. As long as the career is well developed, individual enterprises can develop well.
Why does roots vacuum pump unit trap oil

The quality application of vacuum pump can speed up the embodiment of equipment performance strength, improve the development advantages of its quality strength, fully accelerate the overall drive of product value performance, make the vacuum pump realize the development advantages of its product value ability and enhance the sustainable development of its quality practice advantages in the process of reliable application and continuous development of performance application effect.
Highlight the improvement of vacuum pump product force, enhance the exertion of its product utilization advantages, and improve its quality and practical effect with the overall driven product force. The oil-free vacuum pump accelerates the exertion of its product utilization ability, continuously accelerates the embodiment of equipment value and performance, realizes the development of product utilization advantage ability, and further enhances the exertion of its quality strength with the development of overall application.
Vacuum pump
In the actual development process of accelerating the application of vacuum pump products, it has promoted the continuous promotion of its product strength, enhanced its overall application strength, accelerated its product application and advantages, enhanced its quality and practical performance, highlighted the development force of its quality and practical ability, improved the practical performance of the equipment and accelerated the overall improvement of its quality strength, It improves the driving force of its product application performance, enhances its product strength, and enhances the overall driving force of its product performance.
The vacuum pump unit reflects the simplification of single pump performance. The system combines various equipment together, which not only enhances the performance strength of products, but also greatly enhances the exertion of equipment application advantages, better provides high-performance equipment application for production, fully reflects the application strength of the unit, and further accelerates the driving of product application strength.
On the basis of accelerating the productivity development of the vacuum pump unit, the application characteristics of the product fully reflect its inherent application advantages. In the development process, the advantages of the vacuum pump unit develop from product strength to performance. The reasonable application of vacuum pump unit is a promotion to the production development of enterprises, which should be directly applied in combination with the performance advantages of its products.




[url="https://www.evpvacuum.com/water-ring-vacuum-pump-negative-pressure-unit-of-typical-configuration.html
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What about the heating of vacuum pump motor?

In the process of using the vacuum pump, friends have encountered the sudden feeling of high motor temperature. At this time, you need to check one by one to eliminate problems.

1、 Causes of high motor temperature

1. The motor has high power, large working current and high calorific value.

2. The fan speed is low, the air pressure is small, and the air volume is small.

3. The number of fan blades is small, resulting in small air volume.

4. Dust and oil stain adhere to the motor, reducing the heat dissipation capacity.

5. The bus voltage where the vacuum pump motor is located is 380V. Due to the uneven cable voltage drop and load distribution, the actual voltage applied by the motor is only 365v. The low voltage causes large operating current.

2、 Measures to solve high motor temperature

The machine power and speed match the SK vacuum pump and cannot be changed. The fan is installed on the motor spindle. The motor speed determines the fan speed and cannot be replaced. Although increasing the number of fan blades can play a certain role, it is difficult to find dynamic balance after increasing the number of blades. If the alignment is not good, the vibration of the motor will increase.

1. Lengthen the original fan cover by 40cm and install an axial fan with the same diameter as the internal fan cover. The motor power of axial flow fan is 850 W, the speed is 1489 R / min and the voltage is 380 v. Keep the original fan. The axial flow fan is controlled by another power supply, and the axial flow fan is not interlocked with the main motor. After the vacuum pump is started, the axial flow fan shall be started in time. 30 minutes after the vacuum pump is stopped, the axial flow fan shall be stopped to fully cool the main motor.

2. Regularly remove the motor dust, keep the motor heat sink clean and increase its heat dissipation capacity.

3. Adjust the bus voltage of vacuum pump to 400V

4. After voltage adjustment, the operating current of the vacuum pump is reduced to 210a and the calorific value is relatively reduced.

5. The insulation aging speed of the main motor slows down and the service life is prolonged.

There are many unexpected problems when using. We can adjust our vacuum pump according to the instructions here. After use, do not forget to maintain the vacuum pump regularly.
What about the preparation before operation of water ring vacuum pump and insufficient negative pressure?

How many maintenance methods of vacuum pump?

The vacuum pump starts the winding and transpiration system respectively to investigate whether the reading of the vacuum gauge climbs after a short decline, which can preliminarily judge the direction of the internal leakage point. The internal leakage mostly occurs on the equipment with water cooling points. No doubt is found in the external leakage inspection, but there are the following phenomena: the pumping speed of the mechanical pump is significantly low, the indication value of the vacuum gauge is low, and the mechanical pump oil emulsifies quickly.

The iron-based parts in the vacuum chamber are significantly rusted. With the above conditions, it is basically possible to guess the internal leakage. First clean the cavity, then pass the cooling water, and carefully check whether the water pipeline has wet points. The wet points are the leakage points. The ionization tube can be used to detect the leakage by being sensitive to some gases under high vacuum, such as or ethanol, Use a medical syringe to spray or ethanol into the suspected area.

Combined with the pointer vacuum gauge, the pointer of the ionization gauge will swing significantly when it is sprayed to the leakage point. In this way, you must be patient to detect the leakage. Wait until the indication of the ionization gauge is stable, that is, the extraction capacity and leakage rate of the vacuum unit are balanced, then erupt, repeat several times, recognize the leakage point, and pay attention to several links in repair, disassembly, cleaning, inspection and installation, It is important that vacuum equipment, large or small, be attributed to precision mechanical equipment.
How to confirm the oil level of 2X-70A rotary vane vacuum pump

The main causes of high working noise of vacuum pump

Vacuum pump is one of the major noise sources affecting vehicle idle speed noise. In order to suppress this noise source and reduce the working noise of vacuum pump, the mounting bracket and rubber pad are abstracted as the spring series model of bracket vibration isolation rubber block bracket, and the influence of the vibration isolation system composed of mounting bracket and vibration reduction rubber block on the vibration transmission of vacuum pump during operation is further analyzed, When the vacuum pump works, the mounting bracket produces strong high-frequency vibration, and the vibration of the bracket causes large structural noise at the body connection, which is the main reason for the large working noise of the vacuum pump

Secondly, the sealing condition of the whole vehicle is poor. After checking the sealing performance of the whole vehicle, it is found that:

1) There are no sound insulation and sealing measures for the engine compartment cover between the extended range engine compartment and the cab, and the noise generated during the operation of the vacuum pump is directly transmitted to the vehicle through the air;

2) There are many useless holes in the front compartment, middle passage, upper part of wheel side motor of rear axle and seat floor in the vehicle, which are not filled. In addition, the openings of steering gear, heating and air conditioning in passenger area and front wall harness are not sealed, and the vehicle is directly connected with the outside world;

3) The installation clearance between the cab door and the sliding door in the middle of the carriage is large, and the door is still connected with the outside after being closed. As shown in Figure 7, the poor sealing of the whole vehicle will reduce the sound insulation effect of the vehicle, and too much noise generated during the operation of the vacuum pump will be transmitted to the vehicle through the air, resulting in large interior noise
2BE series liquid ring vacuum pump in inlet/outlet compensator

Is the vacuum pump after maintenance so different?

At present, some customers are not very clear about the maintenance of the vacuum pump, mainly focusing on the simple replacement of three filters and one oil, thus ignoring other maintenance. The efficient and energy-saving operation of the vacuum pump provides a strong guarantee for production and is inseparable from correct maintenance. Therefore, in addition to the normal maintenance of three filters and one oil, attention should also be paid to the maintenance of the motor and valve parts of the vacuum pump.

#Maintenance of motor

The motor runs every 4000 hours or once a year, whichever comes first, and special high-temperature grease needs to be added (Atlas Copco motor high-temperature grease part No. 2901033803). The motor speed of the vacuum pump is very high. For a commonly used pump, the Z high speed of GHS 900 VSD + is close to 5600 rpm, which is nearly twice as fast as that of the air compressor with the same power of 22KW. Therefore, it is necessary to pay attention to the lubrication of motor bearings. If the motor grease with the wrong model is not added for a long time, it is easy to cause poor lubrication of the motor and damage the motor in serious cases.

The bearing of the vacuum pump on the customer's site was damaged and the motor was burnt out due to neglect of the maintenance of the motor. It is suggested that the motor grease filling gun Z of the vacuum pump should be dedicated to avoid mixing with the filling gun used by other different equipment using different types of motor grease.

In addition, the motor needs to be overhauled every 24000 hours to avoid sudden damage to the motor and greater loss due to the service life of the motor bearing.

#Maintenance of temperature control valve

The main function of the temperature control valve is to control the oil temperature and prevent the oil temperature from being too high and too low. If the oil temperature is too low, it will not only affect the lubrication efficiency of the system, but also have the risk of condensate precipitation, which will accelerate the emulsification of vacuum pump lubricating oil and bring risks to the normal operation of the equipment. If the oil temperature is too high, it will accelerate the aging and deterioration of the lubricating oil of the vacuum pump, increase the oil change frequency of customers, bring more maintenance costs and affect the service life of the equipment.
Explosion proof and high temperature resistant vacuum unit