screw vacuum pump analysis and advantage introduction

screw vacuum pump analysis and advantage introduction

The use and advantages of the screw vacuum pump are described. First, the use of the screw vacuum pump is described. The two screws of the screw vacuum pump are calibrated by precise dynamic balancing, supported by bearings. The device is in the pump shell, and there is a certain gap between the screw and the screw. Therefore, when the pump is working, there is no friction between them, the operation is stable, the noise is very low, and the working cavity does not need smooth oil, The dry screw vacuum pump can pump out the gas place which contains a lot of water vapor and a small amount of dust. It has the advantages of higher limit vacuum, lower power consumption, energy saving and maintenance free. It is an updated product of oil sealed vacuum pump.

Then analyze the advantages of screw vacuum pump. At present, the development of various vacuum pumps is more and more affected by vacuum applications. The general vacuum system cannot meet the requirements of clean, oil-free and corrosion-resistant. Therefore, in recent years, the market demand of dry vacuum pump is large, and the vacuum products have been updated, A large number of oil vacuum systems have been replaced by oil-free clean vacuum systems. Almost every large foreign vacuum company produces various types of dry vacuum pumps. Screw vacuum pump is a non-contact dry pump, which is an ideal pump in the early 1990s. It is widely used for its wide pumping speed range, simple and compact structure, no friction, long life, low energy consumption, no oil pollution and other advantages.

Due to its superior performance, dry screw vacuum pump has become the first choice of vacuum obtaining equipment in microelectronics, semiconductor, pharmaceutical, precision processing and other industries in Europe, America and Japan. Based on screw compressor, Japan has long developed the multi rotor profile of vacuum pump and put it into the market. Several vacuum equipment companies in Germany have gradually developed equal pitch and variable pitch rotor profiles, and have done a lot of research on rotor and body cooling. In 2008, Chinese enterprises also put the production of screw vacuum pump into mass production, which has been well applied in chemical and pharmaceutical industries.

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Dry Type Vacuum Pump

Maintenance of water ring vacuum pump

With the development of the times, the progress of science and technology, the gradual improvement of people's life style, the gradual renewal of the way of thinking, the development of the mechanical industry and society, more and more commitments, the mechanical application field is more and more extensive, and the pump industry is gradually popularized, from the previous single pump to each now, all kinds of other industrial pumps are used, the time span.

Today, the social development of this pump is becoming more and more powerful, especially in the main aspects of this project, which has a wide range of uses. The pump types may be more or even more than a few, such as: water pump, sewage pump, mud pump, mud pump and water ring vacuum pump. Each pump feeding is more or less the same, for example, the water ring vacuum pump, its maintenance is not very difficult, because its application range is very wide, so the ground is also a normal phenomenon, so we should regularly maintain, if not ready to use for a long time, in order to prevent rust in the pump, we should often coupling. If you want to get the next use flexibility, or regularly add lubricating oil or grease to the bearing, then you can keep the bearing flexible and convenient for the next use. Use the water ring vacuum pump and vacuum pump body to unscrew the guide plug and pour water. Especially in the mechanical seal of the water ring vacuum pump, the motor is starting again.

In case of abnormal sound of water ring vacuum pump, stop and check the cause of pump body to avoid damage and impact on the project. The water ring vacuum pump changes the lubricating oil in the first month, 100 hours later, and every 500 hours later, the oil has one time. In order to continue to use, there is no flexibility of this phenomenon. Check the worn casing regularly and replace the large-scale casing.

Roots Water Ring Vacuum Pump System Installation

Water Ring Pump

Water Ring Vacuum Pump

Classification of dry vacuum pumps

In the past, oil vacuum pumps were widely used in various semiconductor processes and vacuum pumps and piston vacuum pumps are important representatives. And they don't make people proud of their applications. Therefore, the dry vacuum pump came into being. Over the past year, there have been several different examples of dry vacuum pump planning and production, and they have significant differences in machine layout planning. Because of this difference, we can classify the dry vacuum pump into the following types: round blade type, claw type, combined type (root claw), screw type.

Today, these examples are widely used by different manufacturers. Round, claw and combination (root claw) are called multistage pumps. Because of their similar methods, vacuum is repeatedly compressed by multi-stage vacuum chamber to produce vacuum. In the process of repeated compression, the temperature and pressure of gas will also change greatly, so it is easier to change the physical properties of gas. Screw pump is called single-stage pump because it can only produce vacuum by vacuum cavity. According to the different gas compression method, it can be divided into internal pressure screw pump and external pressure screw pump. Here are some physical examples of these differential pumps that are expected to be funded.
The two peak scheme is that roots pump is the most popular and widely used very similar. In fact, the first dry pump plan was to pump roots together. This multi-stage scheme makes the gas path very large, and each stage needs a large nitrogen flow to dilute and cut off. At the same time, in order to get a good vacuum, all levels of customs clearance requirements are very strict. Of course, this program makes the power consumption relatively low due to the increase of internal compression ratio.

The principle of one three leaf circular scheme is exactly the same, two leaf segmentation scheme. It divides the gas into three parts, not a circular disc. It's two copies. There are similar advantages and disadvantages between three lobed ring programming and bicircle splitting scheme. In order to further reduce the power consumption, some manufacturers choose two DC motors in the transmission department, but this will also lead to the reduction of torque and the ability to restart. In the same way, the scheme of every three lobes needs a large flow of nitrogen dilution effect.

The progress of the combined (root and claw) program is that the claws with lower pressure are subject to pumping under the leadership of rocalay and the progress of pumps under higher pressure. The basic principle of the front gas path of the same type of program blade. Some manufacturers have changed their final phase to a star like program, such as allowing gas to be divided into five parts in a spinning cycle, such as the three-wheel program, which can be divided into three parts. Similarly, in many processes, each phase of a joint program requires a large flow of nitrogen to dilute and shut off.
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The reason of low speed of vacuum pump

The reason of low speed of vacuum pump

The vacuum pump has been used for a long time. It is inevitable that the rotating speed will be too low. Let's analyze the reasons.

1. The drive belt is worn. There are many pumps with belt transmission, because of long-term use, the transmission belt is worn and loose, and slip occurs, thus reducing its speed.

2. Improper installation. If the center distance between the two pulleys is too small or the two shafts are not parallel, if the tight side of the drive belt is installed on it, the wrap angle is too small, the diameter calculation of the two pulleys is wrong, and the eccentricity of the two shafts of the vacuum pump driven by the coupling is too large, the speed of the pump will change.

3. Mechanical failure of the pump itself. If the fastening nut between impeller and pump shaft is loose or the pump shaft is deformed and bent, the impeller will move more, directly rub with the pump body, or the bearing is damaged, the speed of vacuum pump may be reduced.

4. Power machine maintenance is not recorded. Because of the burning of the motor winding and the loss of excitation, the change of winding turns, wire diameter and wiring method in the maintenance, or the failure in the maintenance is not completely eliminated, the speed of the vacuum pump will also change.

5. Human factors. Because of the damage of the original electric motor, quite a number of users are randomly equipped with another electric motor to drive, resulting in the consequences of less flow, low head or even no pumping water.

In short, when we use the vacuum pump, we must strictly follow the instructions.

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Liquid Ring Vacuum compressor

water ring vacuum pump pumping speed

The pumping speed of water ring vacuum pump, in short, is the volume of gas pumped out through the pump port in a certain unit time. The following is a detailed introduction.

1. The gas pumped from the suction port of the vacuum chamber can only be pumped by the vacuum pump through the flow guide u, except that the movement process of the gas pumped from the suction port of the vacuum chamber to the pump port is the flow from high pressure to low pressure, while the gas pumped from the pump port is the forced flow from low pressure to high pressure based on some pumping principle.

2. The connecting pipe between water ring vacuum pump and vacuum chamber can include cold well and valve, etc. if the flow guide between pump and vacuum chamber is u, the pump can only pump air to vacuum chamber through flow guide u, and its pumping capacity will be limited. At this time, the real significance of the pumping effect on the container is the effective pumping speed S0 at the pumping port of vacuum chamber

3. According to the basic vacuum equation, two extreme results can be obtained mathematically, that is, when the flow guide u is very large, the pumping speed of the water ring vacuum pump can be approximately equal to the pumping speed s of the pump, when the pumping speed s of the pump is very large, or the flow guide u is very small, the effective pumping speed S0 of the vacuum chamber is approximately equal to the flow guide U

4. If the pumping speed of water ring vacuum pump is very large, that is to say, relative to the pumping speed of the pump, the flow guide u is very small. At this time, the actual pumping capacity of the pump does not depend on its pumping speed, but on the ability of gas passing through the flow guide U. the flow guide value is exactly the effective pumping speed S0

5. The flow guide u is very large, that is, the amount of gas passing through it is not limited, so the pumping capacity of the pump depends on its own pumping speed, which is the same as that the pump port is directly connected with the vacuum chamber.

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Water Ring Vacuum Pump

Causes of motor overload of water ring vacuum pump

Causes of motor overload of water ring vacuum pump

Water ring vacuum pump used for a long time, there may be a series of problems, such as motor overload, so what is the reason?

1. In the process of pumping, if the pipeline is blocked and the water ring vacuum pump is overloaded, the motor will be overloaded after a long time.

2. Its water inlet generally does not need water inlet pressure. If the water inlet pressure is too large, too much water will cause motor overload.

3. Sometimes in use, the air inlet of the water ring vacuum pump will have a certain amount of water entering, if the water enters for a long time, it will cause its motor overload.

4. After a long time of use, the performance of the bearing will slow down. If there is a problem in the bearing, if it is not found in time, it will also cause overload.

5. In the pipeline installation of water ring vacuum pump, if the outlet pipeline is too long or the diameter of the outlet pipeline is smaller than the diameter of the exhaust port, it will often cause overload.

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Vacuum pump commonly used in antibiotic production

The vacuum pumps commonly used in antibiotic production are reciprocating, rotary, Yanqi jet pump and water jet pump, etc.

The reciprocating vacuum pump is usually W-type vacuum pump, which has five specifications of W1 to W5, and its pumping rate is 60-770m3 / h, and the pumping capacity of this kind of vacuum pump is generally large.

There are two types of rotary vacuum pump: vane type and water ring type. Type 1401 and type 150 are common rotary vane pumps. Generally, this kind of vacuum pump has smaller air extraction and higher vacuum degree. Water ring vacuum pump is another kind of rotary vacuum pump. It relies on the eccentric rotor equipped with a vane to rotate in the water filled pump body. The water of the vane is thrown into a water ring, which seals the vane into many chambers. When the eccentric rotor rotates, these chambers gradually expand or shrink, so that the gas is inhaled and discharged. The vacuum pump has the advantages of simple structure, durability and convenient installation, but its vacuum degree is not high. The commonly used model is SZ type

The steam jet pump uses the static pressure energy and kinetic energy to transform each other when the steam flows, inhales and discharges the gas. Yanqi jet pump has single stage and advanced Yanqi jet pump, and the vacuum degree increases with the increase of stages.

Water jet pump is also called water jet pump. This kind of vacuum pump belongs to coarse vacuum equipment. Its vacuum degree is not high, but it is simple and easy to operate, so it is widely used.

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Liquid Ring Vacuum compressor

Construction of mechanical vacuum pump

In order to obtain low vacuum, the most commonly used mechanical pump is oil sealed rotary pump, which is called vacuum pump for short. This kind of mechanical pump is widely used because of its high limit vacuum (0.133 ~ 0.0133pa) and its pumping rate is not very low when the pressure is about 133.3pa.

The structure of a common vacuum pump is shown in Figure 59. The inside of the pump is mainly a round simple stator. There is a precision machined solid circle as the rotor. The rotor is eccentrically arranged above the stator cavity wall to separate the air inlet and exhaust pipes, and plays an air tight role. The two wings s and s' are horizontally embedded in the diameter of the rotor body. They are compressed by a spring clamped in the middle of them (see Fig. 60). S and s' divide the space between the rotor and the stator into three parts. When the piece is boarded at position 60A in figure, the air enters space a from the container to be pumped through tube C. When s leaves with the rotation of rotor, area a in Figure 60b increases. The gas is inhaled through pipe C. When turning figure 60C, s' separates space a from air intake pipe C, and then the rotor continues to turn. The volume of space a gradually reduces. The gas is compressed. Until the pressure is greater than 101325p., the vent valve opens and the gas is expelled. In this way, when the rotor is rotating, the space separated by the two wings continuously aspirates and exhausts, making the evacuated container reach a certain degree of vacuum.

The compression ratio of this pump can be as high as 700:1. Therefore, if there is water gas or other condensable gas in the air to be pumped, when the gas is compressed, swallow gas may condense into liquid and become numerous small drops mixed into the oil. With the internal circulation of the oil in the pump, on the one hand, it will be sent to the pumped container, greatly reducing the vacuum degree of the system; on the other hand, it will damage the quality of the oil, reduce the sealing and lubricating effect of the oil in the pump, and also make the rotor stator wall rusty. In order to solve this problem, in addition to the air inlet in the pump to reduce the compression ratio of air and swallow gas, it is also necessary to install a cold trap or absorption tower before the inlet.

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Water Ring Pump

Water Ring Vacuum Pump

Vacuum pump and its type

A container is placed in a natural environment. If the internal gas pressure is not changed, the internal and external gas pressure of the container will reach a state of equilibrium, which is numerically equal to atmospheric pressure. In order to make the inside of the container reach the vacuum state, it is necessary to discharge the gas inside the container so that the internal gas pressure is less than the external atmospheric pressure. A vacuum pump is a kind of equipment that uses mechanical, physical, chemical or physicochemical methods to discharge gas from the container to obtain vacuum.

According to its working principle, vacuum pump can be divided into two types: compression type (variable volume type) and adsorption type. The working principle of compression vacuum pump is to compress the gas at the inlet end of the pump to the outlet end and discharge it to the outside of the pump. Common compression vacuum pumps are: rotary mechanical pump using expansion compression discharge process, turbine molecular pump using turbine blades to exhaust gas, etc. The working principle of adsorption vacuum pump is to adsorb gas in the pump body, which has achieved the purpose of reducing gas pressure.

Common adsorption vacuum pumps include: ion pump with ionization suction, adsorption pump with physical or chemical adsorption, suction pump and low-temperature condensate pump, etc. The biggest difference between the adsorption vacuum pump and the compression vacuum pump is that the adsorption vacuum pump does not discharge the gas out of the pump, but store it in the pump. The former can achieve higher vacuum degree than the latter, but the pumping speed is small, and the applicable container is also small. The vacuum resistance furnace adopts compression vacuum pump, such as mechanical pump, roots pump and diffusion pump.

All kinds of vacuum pumps have their own working range. Some pumps can work directly from the atmospheric state, such as mechanical pumps and adsorption pumps. Some pumps cannot work directly from the atmospheric state, such as diffusion pumps, molecular pumps, ion pumps, etc. only when the inlet vacuum reaches a certain value can they start to work.

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The reason of high temperature of vacuum pump

Now I'd like to introduce the cause analysis of the high temperature of the vacuum pump. I hope it can help you. Let's have a look together

1. The motor has high power, large working current and large heat output.

2. Fan speed is low, wind pressure, air volume is small.

3. The number of fan blades is small and the air volume produced is small.

4. The motor is attached with dust and oil, which reduces the heat dissipation capacity.

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

Do you understand the introduction of vacuum pump? I hope that a brief introduction can bring benefits to you and we will serve you wholeheartedly.

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Liquid Ring Vacuum compressor

Main classification of stainless steel vacuum pump

Stainless steel vacuum pump is widely used, and the vacuum pump on the market is also various, and its classification is different in different application environments. Let's briefly understand its main classification.

2BV water ring vacuum pump is suitable for continuous operation to form a vacuum and to remove dry and wet gases, mainly non flammable, non corrosive atmosphere and atmosphere / steam mixture. According to the requirements of customers, we can provide vacuum pumps suitable for flammable, explosive and toxic media.

In this case, users should take corresponding safety measures. The working fluid is usually water. 2BV vacuum pump is suitable for the occasions with more stringent requirements on corrosion prevention and sanitation. 2BV vacuum pump is used in the range of coarse vacuum; the limit vacuum is determined by the saturated vapor pressure of working fluid.

2SK series two-stage water ring vacuum pump is characterized by high vacuum degree and large pumping speed in high vacuum area; compact structure and convenient maintenance; wide application range, it can pump various gases containing water vapor, inflammable, explosive, small amount of dust and small amount of liquid; main water is used as working medium, with low maintenance cost; it can work in a relatively harsh environment.

It is suitable for working conditions with suction pressure lower than -0.08mpa. 2sk-p1 series is suitable for working conditions with suction pressure lower than - 0.096mpa. When equipped with air pump, the limit vacuum degree can reach - 750mmhg. The working vacuum range is -0.03-0.08mpa.

The direct water ring vacuum pump can be one of the series of water suction pumps. It is an upgraded product based on the traditional water ring vacuum pump in China. It adopts the coaxial direct connection design of the machine and pump, with high reliability, easy installation and maintenance, and 30% less volume than the traditional vacuum pump. It operates stably, with noise lower than 62 dB, has self-priming ability and is easy to operate.

Because of the oil-free design, it is basically free from maintenance, because of the use of mechanical seals to eliminate leakage. 50% of the working liquid of the gas water separator equipped with the pump can be recycled, which reduces pollution and operation cost. The pump adopts bronze impeller, which improves the corrosion resistance of the pump. According to the user's requirements, the pump is made of stainless steel, and it will operate normally in severe environment.

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Water Ring Pump

Water Ring Vacuum Pump

Measures to prevent cracks in vacuum pump

In the normal production of enterprises, if we don't use vacuum pump for a long time, there will be cracks and other phenomena on the blades. How can we solve this problem?

1. Before the maintenance, the shaft journal on both sides of the rotor, the bending degree of the rotor and the deflection degree of the processing surface of the gluten plate on both ends of the impeller shall be measured.

2. The obvious cracks on the rotor of the Nasim vacuum pump are polished and cleaned with an angle grinder, and the fillet of the welding joint is polished to ensure the welding quality.

3. Check the parts of vacuum pump that are prone to cracks by coloring method. If there are cracks, polish them and weld them.

4. The rougher part of the blade surface is punched with a grinder to improve the surface finish of the vacuum pump blade.

If any crack is found in the vacuum pump during production, it must be stopped in time and reported to the maintenance department for inspection, so as to avoid unnecessary situation and normal production.

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multistage vacuum pump

multistage vacuum pump

There are two reasons for the damage of multi-stage vacuum pump seal: man-made damage and natural damage. The seal of multistage vacuum pump will be scratched, bruised and squeezed when it is opened or closed. Mechanical damage between two sealing surfaces. Under the action of high temperature and high pressure, atoms permeate and exude each other, and adhesion occurs. When the two sealing surfaces move mutually, the adhesion part is easily pulled and torn. The coarser the surface of multi-stage vacuum pump sealing surface is, the more easily this phenomenon occurs.

When the medium is active, the sealing surface of the multi-stage vacuum pump is worn, washed and cavitating. The floating fine particles in the medium collide with the sealing surface, causing local damage. The high-speed moving medium directly washes the sealing surface, causing local damage. When the medium is mixed and partially vaporized, the gas producing bubble blasting impacts the sealing surface, causing local damage. The erosion of medium and chemical erosion alternately will strongly erode the sealing surface.

The potential difference and electrochemical erosion will occur due to the mutual contact of sealing surfaces, the contact between sealing surfaces and sealing body and valve body, as well as the concentration difference of medium and oxygen concentration difference, resulting in the erosion of sealing surfaces on the anode side. However, in the case of no current generated by the medium near the sealing surface, the medium directly plays a chemical role with the sealing surface, forming chemical erosion and eroding the sealing surface.

The processing quality of sealing surface is not good, which mainly indicates that there are cracks, air holes, ballast and other defects on the sealing surface. The hardness of sealing surface caused by improper selection of surfacing and heat treatment specifications and poor control in the process of surfacing and heat treatment is too high or too low. The hardness of sealing surface caused by wrong material selection or improper heat treatment is not uniform and corrosion-resistant, which is mainly caused by blowing the base metal to the top in the process of surfacing to dilute the alloy composition of sealing surface.

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Liquid Ring Vacuum compressor

Small vacuum pump

Small vacuum pump

Small vacuum pump is also called micro vacuum pump because of its small volume. Small vacuum pump (i.e. micro vacuum pump) refers to an instrument that has one suction nozzle and one exhaust nozzle, and can continuously form vacuum or negative pressure at the inlet; micro positive pressure is formed at the exhaust nozzle; the working medium is mainly gas, and the volume is small. Small vacuum pump can be used for air conditioning, refrigeration equipment repair, suction device of medical instruments, printing machinery, vacuum packaging, vacuum plastic suction, physical and chemical experiments and small devices requiring vacuum environment. The scope of application covers scientific research, gas sampling, instruments, chemical analysis, medical and health care, medical and health care, bioengineering, automatic control, environmental protection, water treatment and many other fields.

The small vacuum pump is not suitable for pumping out the gas which corrodes the ferrous metal, reacts with the pump oil chemically, contains the particle dust, as well as the toxic gas which contains too much oxygen and is explosive. It can not be used as a transfer pump (i.e. pumping from one container to another).

The circular motion of the small vacuum pump motor makes the diaphragm inside the pump do reciprocating motion through the mechanical device, so as to compress and stretch the air in the fixed volume pump cavity to form a vacuum (negative pressure), and generate a pressure difference with the external atmospheric pressure at the pump suction port, under the effect of the pressure difference, the gas pressure (suction) into the pump cavity, and then discharge from the exhaust port.

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How is the vacuum pump driven

How is the vacuum pump driven? Let's have a brief understanding next.

The two rotors of vacuum pump are operated synchronously by a pair of high precision gears. The driving shaft is connected with the motor through the coupling. There are mainly two types of transmission structure: one is that the motor and gear are placed on the same side of the rotor.

Driven rotor is directly driven by the motor end gear, so that the torsional deformation of the active rotor shaft is small, the gap between the two rotors will not be changed due to the large torsional deformation of the active shaft, so that the gap between the rotors is even in the operation process.

The biggest disadvantages of this kind of transmission mode are: A. There are three bearings on the driving shaft, which increases the difficulty of pump processing and assembly, and the disassembly and adjustment of gears are also inconvenient; B. the overall structure is uneven, and the center of gravity of the pump is inclined to one side of the motor and gearbox.

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Repair steps of vacuum pump unit

The gas compression of vacuum pump unit is isothermal, which can remove flammable and explosive gas. It is hard to avoid poor maintenance in use, and the conventional repair method is welding. However, some parts are made of cast iron, aluminum alloy and titanium alloy, which are difficult to be welded, and even some dangerous occasions prone to explosion are not easy to be welded. So how to fix this situation?

1. Apply a thin layer of material first to ensure the bonding and full coverage of the vacuum pump unit, and then evenly apply the material to the repair surface to achieve the required repair thickness.

2. When the material temperature is increased by 11 ℃, the curing time will be shortened by half, but the rising temperature shall not exceed the bearing temperature of the material.

3. Remove the oxide layer on the surface of vacuum pump unit and clean the surface with acetone.

4. Mix strictly according to the proportion, and mix evenly until there is no color difference.

The "cold welding" technology of vacuum pump unit can avoid thermal stress deformation, at the same time, the material has good adhesion, compression resistance, corrosion resistance and other comprehensive properties, which can meet the use requirements of various equipment components to a greater extent, so as to effectively ensure production with low cost investment. Safe, convenient and reliable. These repair methods must be kept in mind, very helpful.

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Liquid Ring Vacuum compressor

Vacuum drying technology of vacuum pump dryer

Vacuum drying technology of vacuum pump dryer

Vacuum drying technology of vacuum pump unit is applicable to the concentration, mixing and drying of powdery, granular and fibrous materials in chemical, pharmaceutical, food and other industries, and the materials requiring low-temperature drying (such as biochemical products, etc.) are more applicable to the drying of materials that are easy to oxidize, volatilize, heat sensitive, strong stimulation, toxic materials and materials that are not allowed to destroy crystal. Here is a specific introduction The technical advantages.

1, chemical, food, health products and other industries drying products, spray drying is conducive to the cost, but the solubility of products. There are big defects in the original taste and the shape of the powder, and there is nothing to do for the products with slightly higher viscosity and heat sensitivity requirements. Conventional freeze-drying can obtain the solubility and high quality products of inferior products, but the output is too low and the cost is expensive.

2. It can make the inner part of the dried product porous and loose. The technological indexes of the low temperature continuous vacuum pump dryer are just between the two kinds of equipment. The original material property and appearance of the product are good. Due to vacuum and low temperature drying, it can meet the processing requirements of local heat sensitive materials.

3. The static drying is transformed into dynamic drying. It greatly improves the output of dry products and reduces the production interest. The dryer of low temperature continuous vacuum pump unit breaks through the technical problem of continuous feeding and discharging under vacuum.

4. Drying of high fat, high sugar and other materials. And can adhere to the stability and consistency of product batch. Low temperature continuous unit dryer is especially suitable for spray drying and high viscosity which is difficult to solve in vacuum oven.

Therefore, when using the vacuum drying technology of vacuum pump unit, it is necessary to pay special attention to the above-mentioned content, so as to avoid damage to the unit due to some of its own wrong operation. At the same time, I suggest that you can learn more about the relevant knowledge of the unit, which is very helpful for your operation.

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Cooling method of water ring vacuum pump unit

Under the long-term use of the water ring vacuum pump unit, the equipment will emit heat. If the heat emitted in a certain period of time is too much, the equipment will be damaged to a certain extent. Therefore, we need to have certain treatment measures at this time. Today we will explain the four treatment methods about cooling for you.

1. Oil film cooling of rotor

The cooling method is to connect an oil pipe at the inlet of the water ring vacuum pump unit, and take the heat of the rotor away with the evenly dripping cooling oil.

2. Air cooling

The so-called wet vacuum pump, that is, the air inhaled by the interstage or two-stage pump is compressed, and then transmitted through a combined muffler with comprehensive absorption and phase difference.


3. Water cooling

The water ring vacuum pump unit generates heat due to the transmission and compression of gas, which must be transmitted from the rotor to the shell.

4. Internal cooling of rotor

In order to make the water ring vacuum pump unit work under a higher pressure difference, a more effective cooling method can be adopted, that is, the rotor is cooled by circulating oil, and there are oil holes and oil diameter shaft heads at both ends of the pump shaft, which are respectively driven in, and then discharged from the other end through the inner wall of the rotor.

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Cooling mode of heat dissipation of roots water ring vacuum unit

Cooling mode of heat dissipation of roots water ring vacuum unit

When the roots water ring vacuum unit carries out energy conversion, there is always a small part of loss converted into heat. It must continuously dissipate the heat through the motor shell and surrounding medium. This process of heat emission is called cooling. There are four commonly used methods:

1. Internal cooling of the rotor. In order to make the roots water ring vacuum unit work under higher pressure difference, a more effective cooling method can be adopted, that is, the rotor is cooled by circulating oil, and the two ends of the vacuum unit shaft are respectively provided with oil holes and oil diameter shaft heads, which are driven through the inner wall of the rotor and then discharged from the other end.

2. Air cooling. That is to say, the air inhaled by the interstage or two-stage pump is compressed and transmitted through the combined muffler with comprehensive absorption and phase difference.

3. Cool down. The roots water ring vacuum unit generates heat due to the transportation and compression of gas, which must be transmitted from the rotor to the shell.

4. The oil film of the rotor is cooled. The cooling method is to connect an oil pipe at the inlet of roots water ring vacuum unit, and take the heat of the rotor away with the evenly dripping cooling oil.

When the temperature of roots water ring vacuum unit is too high, different cooling methods can be adopted to avoid loss

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Liquid Ring Vacuum compressor

An analysis of the important role of rotary vane vacuum pump in the process of pumping

The vane vacuum pump plays an important role in the process of pumping. It sucks gas from the air inlet, compresses the gas that has been absorbed, and then discharges the pump. The system can transport the extracted gas from the extracted space to the atmosphere outside the system from the direction of the air inlet to complete the extraction. Two parts of gas are sucked in and two parts are discharged by the rotor rotating once.

The rotary vane vacuum pump has the following functions:

(1) Seal the exhaust valve to prevent the atmosphere from entering the pump through the exhaust valve.

(2) A small amount of pump oil enters into the pump from the exhaust valve and other gaps to play the role of lubrication and cooling, and forms an oil film at the gap between the rotor and the pump body, between the rotor and the rotating disc, which improves the sealing performance and prevents the gas with high pressure discharged from the pump cavity from leaking back to the suction cavity.

(3) When the vacuum degree of the rotary vane vacuum pump is high, the amount of gas is small. After compression, the gas in the exhaust cavity is still not enough to open the exhaust valve. If there is vacuum pump oil in the pump cavity, the exhaust valve can be opened by means of the incompressibility of the oil to achieve exhaust.

In order to ensure good vacuum performance of mechanical vacuum system, there are certain requirements for vacuum pump oil:

(1) The saturated steam pressure of the mechanical pump oil of the rotary vane vacuum pump should be low enough, usually at 20 ℃, the saturated steam pressure is not more than 5.3 × 10-3 PA.

(2) Mechanical pump oil shall have proper viscosity, which is generally specified to be within the range of (47-57x10-6m2 / s) at 50 ℃.

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Knowledge of water temperature performance of water ring vacuum pump

The following vacuum pump factory introduces the water temperature performance of water ring vacuum pump, hoping to help you.

The water temperature of the water ring vacuum pump has a great influence on its performance, and the performance curves of the water ring vacuum pump are all measured under the water temperature of 15 ℃. Therefore, the pumping rate of the water ring vacuum pump should be modified when the water ring vacuum pump is actually selected.

The actual pumping speed of water ring pump can be calculated according to QT = q15k, k = (P1 PT) / (p1-p15), where:

1. QT - air volume at t ℃ (m3 / min) Q15 - air volume at 15 ℃ (m3 / min).

2. P1 - suction pressure of water ring pump mmHg Pt - saturated steam pressure mmHg at t ℃.

3. P15 - saturated steam pressure mmHg K at water temperature of 15 ℃ - gas volume correction coefficient.

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Method of reducing crankshaft wear of dry vacuum pump

Method of reducing crankshaft wear of dry vacuum pump

Crankshaft is an important part of engine. It receives the force from the connecting rod and converts it into torque output through the crankshaft and drives other accessories on the engine. If the crankshaft is seriously worn, the normal operation of the machine will be affected. Similarly, if the crankshaft of the dry vacuum pump is worn, it will not only affect the normal operation, but also cause danger. How can we reduce the wear and tear?


The surface wear of Crankshaft Journal of dry vacuum pump is uneven. The radial wear of main journal and connecting rod journal is mainly elliptical, and the wear parts correspond to each other, that is, the wear part of each main journal is close to the side of connecting rod journal; the wear part of connecting rod journal is also close to the side of main journal. The elliptical wear of crankshaft journal is caused by the uneven distribution of the force acting on the journal along the circumference.

When the engine is working, the general force on the connecting rod journal always acts on the inner side of the connecting rod journal, and the direction is outward along the crankshaft radius, so the inner side of the connecting rod journal is worn greatly, forming an ellipse. The reason for the wear of the connecting rod journal of the dry vacuum pump is that the oil passage leading to the connecting rod journal is inclined. Under the action of centrifugal force, the mechanical impurities in the lubricating oil tend to accumulate on one side of the connecting rod journal, making the wear of the connecting rod journal tapered.

There may also be scratches and burns on the surface of the journal when it is used. The abrasion is mainly caused by the unclean engine oil, during which the larger consolidation mechanical impurities are scratched on the surface of the journal. The burn on the surface of the journal is caused by the burning of the bearing, which is mainly caused by the thin oil and other reasons.

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How to solve the overload of Roots vacuum pump

The power required by roots vacuum pump to compress gas is directly proportional to the pressure difference. Once the gas pressure difference is too high, the pump may be overloaded and the motor winding may be burnt. There are several ways to deal with the problem of pump overload: select mechanical active pressure regulating bypass valve. The bypass valve is installed on the bypass pipe between the outlet and inlet of Roots vacuum pump.

This valve operates the differential pressure between the pump inlet and the pump outlet without exceeding the additional value. When the pressure difference reaches the extra value, the valve will open actively by the effect of pressure difference, so that the outlet of Roots vacuum pump is connected with the inlet, so that the pressure difference between the inlet and the outlet drops rapidly. At this time, roots vacuum pump operates under the load without pressure difference. When the pressure difference is lower than the additional value, the valve is actively closed, and the gas is pumped out by the front stage pump through the roots vacuum pump.

The roots vacuum pump with bypass overflow valve can be started together with the previous pump, which makes the operation of the unit simple and convenient. The selection of hydraulic coupling can also avoid overload of the pump, so that the pump can operate under high pressure difference. The hydraulic coupling is installed between the pump and the motor. In normal operation, the hydraulic coupling transmits additional torque from the motor end to the pump.

The maximum pressure difference of Roots vacuum pump is determined by the maximum torque transmitted by the hydraulic coupling, while the maximum torque transmitted by the hydraulic coupling is regulated by the amount of liquid in between. When the pump works under high pressure difference or starts together with the front pump, there is a speed difference in the liquid coupling, that is, sliding, which only transmits a certain moment to slow down the pump. With the pumping process, the gas load is reduced, and the roots vacuum pump is gradually accelerated to an additional speed.

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How to disassemble liquid ring vacuum pump

Liquid ring vacuum pump can be divided into single stage and double stage, and the difference between single effect and double effect. The single-stage and double-stage vacuum pumps refer to the stages of their impellers; the single / double effect refers to the way of their impellers / casings. The impellers of the single effect impeller vacuum pump rotate once and experience one suction / discharge of gas; the impellers of the double effect vacuum pump rotate once and experience two suction and discharge of gas.

All parts of the liquid ring vacuum pump shall be completely cleaned in the process of repair. The specific steps of disassembly and assembly are as follows: unscrew and remove the screws, and remove the diaphragm of the liquid ring vacuum pump cover and O-ring assembly along the axial direction. Generally, it is not necessary to remove the diaphragm from the pump cover, but if it is necessary to replace the diaphragm, clean or replace the valve plate, or if the cavitation maintenance pipe and O-ring are dropped, the diaphragm shall be removed from the pump cover.

When the diaphragm is disassembled from the pump cover, it can be pierced into a Φ 12M, l = 140mm round rod from the emptying port of the liquid ring vacuum pump cover. After the diaphragm is removed, the valve plate baffle, valve plate and cavitation maintenance pipe can be removed from the disc. Unscrew the bolts and remove the pump cover, diaphragm and O-ring together.

Screw out the screw, take out the impeller pressing plate and adjusting washer, pull out the impeller through pulling force, and remove the flat key from the main shaft. Remove the mechanical seal. In order to remove the mechanical seal more simply, the motor shaft before the mechanical seal can be coated with water and smooth (rubber bellows seal prevents oil or grease from being smooth). If there are calcifications such as scale on the electric shaft, the mechanical seal shall be removed after it is cleaned, otherwise the mechanical seal will be damaged simply.

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What is the vacuum degree of water ring vacuum pump

In theory, vacuum means that there is no substance in the volume. Usually, the pressure in the container is lower than the normal atmospheric pressure (101325pa), which is called the vacuum state. Many people don't understand the vacuum degree of water ring vacuum pump, so follow this article to understand it.

Vacuum degree refers to the thinness of gas in vacuum state, usually expressed by pressure value. The value of vacuum degree indicates that the actual value of the system pressure is lower than the atmospheric pressure. The value expressed from the table is also called the table pressure, which is also called the limit relative pressure in the industry. In practical application, the vacuum degree usually has two expressions: absolute vacuum and relative vacuum. The value read from the vacuum gauge is called vacuum degree. Vacuum degree = atmospheric pressure - absolute pressure (atmospheric pressure is generally 101325pa, and the ultimate absolute pressure of water ring vacuum pump is 3300pa; the ultimate absolute pressure of rotary vane water ring vacuum pump is about 10Pa)

The relative pressure is how much lower the measured internal pressure is than the "atmospheric pressure". It shows that the actual value of system pressure is lower than that of atmospheric pressure. Because the air inside the container is pumped, the internal pressure is always lower than the external pressure of the container. When expressed in terms of relative pressure or gauge pressure, the value must be preceded by a minus sign, indicating that the internal pressure of the container is lower than the external pressure.

The absolute pressure is how much higher the measured internal pressure is than the theoretical vacuum (the theoretical vacuum pressure value is 0Pa). The object of comparison is the absolute vacuum pressure value of theoretical state. Due to the limitation of technology, we can not pump the internal pressure to the absolute vacuum value of 0Pa in any case. The vacuum value of water ring vacuum pump is higher than the theoretical vacuum value. So when we use absolute vacuum, there is no minus sign in front of the value.

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Selection of Roots vacuum unit

Selection of Roots vacuum unit

It is very important to choose the pumping speed ratio of vacuum unit and vacuum pump. Next, I will briefly talk about the precautions for the selection of Roots vacuum unit.

Because the compression ratio of vacuum pump is very limited. This compression ratio determines the capacity of the previous pump, because the compression ratio is the inverse ratio of the pumping speed of the two pumps. Generally, the compression ratio is selected within 2-10. In addition, we should consider the requirements of pre pumping time. Vacuum equipment is used as auxiliary equipment in all kinds of mechanical equipment. If the normal working time is much longer than the pre pumping time, a smaller front pump can be selected (the compression ratio can be larger), if the vacuum is larger. Moreover, it is required to pre pump soon, so a larger pre pump is used.

Sometimes, in order to give full play to the efficiency of the equipment, a larger pre pumping pump is installed in front of the unit, which is stopped after normal operation, and maintained by a smaller pre pump, so as to save power. The requirements for the ultimate pressure of Roots vacuum pump unit are also necessary to be considered when selecting the front stage pump. The high requirements for the ultimate vacuum degree (up to 1 × 10-3pa ~ 1 × 10-2Pa pressure) generally select the two-stage rotary vane oil seal mechanical pump or two-stage sliding Yan mechanical pump as the front stage pump.

The mechanical pump with single-stage oil seal can be used as the front pump when the limit vacuum is between (1 × 10-2Pa ~ 1 × 10-1pa), and the reciprocating vacuum pump or liquid ring vacuum pump can be used as the front pump when the limit vacuum is between 133 ~ 1333pa. In order to obtain a high pumping rate at a low inlet pressure (1-100pa), a Roots vacuum pump can be used as a three-stage or four-stage unit composed of a front stage pump of another roots vacuum pump. At this time, the pumping ratio between roots vacuum pumps is generally between 2 and 5.

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Factors affecting sealing effect of water ring vacuum pump

When we use the water ring vacuum pump, sometimes the sealing effect will decline. How can we deal with this situation? To solve the problem, we first need to understand the reasons for this situation. The following article explains the factors that affect the sealing effect of water ring vacuum pump in detail. Let's take a look at them.

1. The biological slime of the water ring vacuum pump fills the gap of the tension spring day by day, which affects the compensation effect of the tension spring in the seal, also intensifies the wear of the dynamic and static ring conflict pairs, and affects the sealing effect of the auxiliary sealing ring. The presentation of this situation requires us to carry out the vacuum pump cleaning regularly.

2. It is inevitable that the working fluid (containing calcium ion) of water ring vacuum pump and the calcium carbonate generated by the reaction of carbon dioxide in the compressed medium will damage the mechanical seal, but we can carry out regular protection to minimize this problem.

3. The corrosion of the metal parts of the whole mechanical seal body caused by the induction effect of the isooxybacteria, biological slime, calcium ions and related chemicals contained in the working fluid seriously affects the sealing effect and application time of the mechanical seal.

4. Although most of the dust in the upstream adsorbent is removed through selection and other steps during loading, with the increase of operation time and the flushing of medium air flow, new dust will be generated more or less, and the dust entering the water ring vacuum pump may enter the sealing position of the machine seal at any time, causing damage to it, so we need to carry out regular maintenance and cleaning.

5. The slow corrosion of the added relevant chemicals to the sealing ring of the water ring vacuum pump will cause the sealing failure. In fact, prior to the selection of chemical reagents for use, the experienced manufacturers will select chemicals with less corrosiveness or even without.

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Application of vacuum pump unit

When a vacuum pump can not meet the requirements of pumping and vacuum, several pumps need to be combined to complement each other to meet the process requirements. The combined vacuum pump is called vacuum pump unit. The vacuum pump unit can make the vacuum system obtain better vacuum degree and exhaust volume, and the vacuum pump unit with high adaptability can make the working condition application obtain high application efficiency. Therefore, we should select the vacuum pump unit correctly.

The application of vacuum pump unit needs to make corresponding preparations, such as the selection and assembly of vacuum pump unit.

The vacuum pump unit shall be selected and applied according to the medium conditions, environmental requirements and working condition specifications of the application project. When extracting the gas, it is necessary to know the composition of the gas and the composition of the extracted gas. The gas contains no condensable steam, whether there is particle dust, whether there is corrosiveness, etc. Select the appropriate pump for the extracted gas. If the gas contains steam, particles and corrosive gas, auxiliary equipment, such as condenser, dust remover, etc., shall be installed on the air inlet pipeline of vacuum pump unit.

When the vacuum pump unit with oil seal vacuum pump is applied, it is necessary to determine whether the vacuum system has requirements for oil pollution. If the equipment is strictly required to be oil-free, various oil pumps should be selected, such as: water ring vacuum pump, low temperature pump, etc. In addition, the impact on environmental pollution should be considered. If the environment is not allowed to be polluted, the oil-free vacuum pump should be selected, or the oil vapor should be discharged to the outdoor. If the requirements are not strict, oil pump can be selected, and some anti oil pollution measures, such as adding cold well, oil trap, baffle, etc., can also meet the requirements of clean vacuum.

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Performance curve of water ring vacuum pump

Vacuum pump unit is a form of using multiple pumps in groups. For such a vacuum pump unit, its performance curve will be more changed with the previous single water ring vacuum pump, so it has a clear understanding.

The typical engine cooling water pump of water ring vacuum pump is a special application of single-stage centrifugal pump in automobile, which has simple type and complex structure. Because the space size of the engine cooling water pump is seriously limited, the water ring vacuum pump and the operating environment are bad, resulting in its low efficiency and serious cavitation damage. Therefore, it is very important to study the relationship between the efficiency and the structural parameters of the engine cooling water pump, and to explore the key factors that restrict the development of the engine cooling water pump.

As an important part of engine water cooling system, the applicability and reliability of engine cooling water pump are paid more and more attention by the design, manufacture and users. Especially with the continuous quality of the engine, the poor working environment of the engine cooling water pump makes the reliability and cavitation damage of the pump especially prominent, which seriously affects the safe, stable and reliable operation of the cooling system. It is of great significance for the development of engine cooling system to discuss how to improve the reliability of engine cooling water pump and study the cavitation mechanism. Aiming at the key factors restricting the development of engine cooling water pump.

And some scholars have carried out in-depth research from three aspects of energy performance, cavitation performance and reliability, and made a lot of related research results, constantly improving the performance and quality of engine cooling water pump. The efficiency of the engine cooling water pump is 10% - 20% lower than that of the ordinary centrifugal pump, while the efficiency of the engine cooling water pump in China is 7% - 15% lower than that in foreign countries. In order to improve the efficiency of the engine cooling water pump, many scholars have carried out a lot of research work in the performance prediction and internal flow. On this basis, the hydraulic performance of the engine cooling water pump has been optimized design and structural improvement. The research on the internal flow of engine cooling water pump is of great significance to improve the efficiency, improve and optimize the structure. However, these research methods are not perfect. In view of the particularity of high temperature and variable speed of engine cooling water pump, the accuracy of numerical simulation needs to be further improved. High speed photography and PIV test are widely used in common centrifugal pumps as effective test methods to study the internal flow of pumps.

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Start up of vacuum pump

Start up of vacuum pump

No matter what device is used for a long time, there will be such and such problems. Vacuum pump is so, when normal operation suddenly strike, it is really confusing. Let's talk about several starting problems of vacuum pump.

1、 The device cannot be started

1. Possible causes: insufficient power supply of motor leads to insufficient speed; insufficient water supply; too large clearance between impeller and distribution board; mechanical seal damage leads to water leakage and air leakage; impeller wear is too much; circulating water cannot be discharged.

2. Troubleshooting: check whether the power supply voltage is within the rated voltage range of the motor; increase the water supply (control within the correct range, otherwise the motor will be overloaded and heated); reduce the clearance between the impeller and the distribution board (generally 0.15-0.20mm); replace the mechanical seal; replace the impeller; check the pipeline at the water outlet.

2、 The vacuum pump is noisy after starting

1. Possible causes: insufficient power supply voltage of the motor; lack of phase operation of the motor; corrosion caused by long-time unused pump; suction of sundries in the pump; impeller drag distribution board.

2. Troubleshooting: check whether the power supply voltage is too low; check whether the motor wiring is reliable; if the pump is not used for a long time, add a little rust remover or open the pump cover to remove the rust manually; open the pump cover to remove the sundries; adjust the distance between the impeller and the distribution board.

3、 The device is difficult to start

1. Possible causes: the water level in the vacuum pump is very high when starting; the packing gland is too tight; the internal parts are rusted; the discharge pressure is increased or the back road is not smooth; the power distribution room is in fault.

2. Treatment method: start according to the specified water level (below the automatic drain valve); loosen the packing gland; pull the rotor hard and wash it with water supply; check whether the back path is smooth and reduce the pressure; contact the electrician for treatment.

The above is a detailed introduction to several problems of vacuum pump start-up. Failure to start, difficulty in start-up, loud noise after start-up, etc. are common problems of abnormal equipment. If similar problems are encountered, they can be remedied in time according to the above content to avoid affecting the work.

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How to reduce vibration of water ring vacuum pump

Compared with the most common SK series water ring vacuum pump, the water ring vacuum pump has the characteristics of strong corrosion resistance, high limit vacuum degree and large exhaust volume. It is widely used in food, petroleum, chemical industry, metallurgy and other fields. It can also pump various gases and corrosive gases without solid particles.

There are two main shock absorption methods: to reduce the vibration of the motor and the transmission shaft, SK water ring vacuum pump is used for transmission, and the rigid connection between it and the transmission shaft is changed to elastic connection. By using elastic sleeve pin coupling, the maximum compensation displacement and compensation angle can be adjusted, so that the vibration of motor and transmission shaft can be compensated by elastic coupling, and will not be directly transmitted to sk water ring vacuum pump.

Considering that it is difficult to reinforce SK water ring vacuum pump, the method of welding "stiffener" in the outlet steel pipe is adopted. Along the inlet and outlet direction, the two end flanges of the connecting steel pipe between the expansion pipe at the outlet of SK water ring vacuum pump and the outlet valve can be welded with several steel plates of specified thickness and width after consulting the seller. Add the rigidity of steel pipe, reduce the deformation and resist the displacement.

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Selected water ring vacuum pump

As for the water ring vacuum pump, to ensure its safe and stable operation, it is for power and stability. If it operates near the limit vacuum degree and Zui high exhaust pressure, the power of the vacuum pump is very low, and the operation is very unstable, so it is easy to have vibration and noise. And the water ring vacuum pump is easy to have cavitation phenomenon, resulting in damage to pump body, impeller and other parts, and even unable to work.

After having basic parameters, in the process of pump selection: if the vacuum degree or exhaust pressure required by the pump is not high, the single-stage pump can be selected preferentially; if the vacuum degree or exhaust pressure is high, the single-stage pump is often not satisfied, and it may be required that the pump still has large air extraction capacity and safe air extraction function under the condition of high vacuum degree, the double-stage pump can be selected.

If the vacuum degree is required to be more than - 710mmhg, the water ring pump unit of gas injector can be selected as the vacuum pumping equipment to improve the pumping speed of the equipment under low pressure and prevent the cavitation phenomenon of the water ring vacuum pump together. If it is only used for vacuum pump, it is better to choose single effect pump, with simple structure, easy protection and good cavitation resistance under high vacuum.

If still be used as compressor perhaps, choose double effect pump more appropriate. The double effect pump has the advantages of large air volume, small volume, active balance of radial force, less fatigue cracking of shaft and long service life.

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Water ring vacuum pump in chemical industry

Water ring vacuum pump in chemical industry

The application of water ring vacuum pump in chemical industry mainly includes anticorrosive water ring vacuum pump, 2BV liquid ring vacuum pump and water ring vacuum unit. There are many main factors that affect the working power of water ring vacuum pump, such as scale inside, and its exhaust pressure to be mentioned in this paper.

During the operation of vacuum pump, air will be continuously discharged from the pump body, forming the vacuum degree required by the operation at the suction port, so the exhaust pressure is also another main factor affecting the working power of water ring vacuum pump. The exhaust pressure will have a huge impact on the suction capacity and shaft working power consumption of vacuum pump. When the vacuum pump system is working, if its exhaust pressure is higher.

The smaller the suction capacity of the vacuum pump, the greater the power consumption of the corresponding shaft. On the contrary, when the exhaust pressure of the system is smaller, the larger the suction capacity of the vacuum pump, and the smaller the power consumption of the corresponding shaft.

In the process of practical work protection, it is necessary to investigate the exhaust pressure data of vacuum pump system in real time. In case of abnormal exhaust pressure data, corresponding measures shall be taken immediately to update and reconstruct the whole vacuum system, so as to improve the working mechanical power of water ring vacuum pump.

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Installation and test run of vacuum pump

Vacuum pump is an important part of oil and gas recovery device, and its reliability determines the reliability of long-term operation of the device. The low installation quality of vacuum pump will directly cause system vibration and affect the normal use of the whole device. Therefore, the correct installation and commissioning of vacuum pump is very important.

Vacuum pump installation

1) Check the foundation quality.

2) The foundation surface shall be leveled around the installation pad iron, and the pad iron shall be installed after the trial installation and good contact.

3) Install the base plate. Put the unit on the basis of embedded foundation bolts, and keep the unit level by adjusting the iron wedge pad. After correction, the anchor bolts shall be tightened to prevent movement.

4) Pour the base and foundation bolts with concrete (secondary grouting). The base must be filled and tamped at the same time.

5) After the concrete is solidified (generally one week later), check whether the base and anchor bolts are loose, then tighten the anchor bolts and recheck the levelness of the pump shaft. At the same time, a 10-15mm thick smooth cement mortar protective layer shall be applied on the foundation, and the sizing block shall not be exposed.

6) Correct the concentricity of pump shaft and motor shaft. The general method is to adjust the motor based on the pump. When there is a gearbox between the pump and the motor, install the gearbox first, and then install the pump and the motor based on it.

7) After installing the pipeline and accessories of the unit, recheck the concentricity.

8) The pipeline shall have a separate support, and the pump unit is not allowed to bear the pipeline load. Sundries in the pipeline shall be cleaned.

9) After the foundation strength reaches 100%, the test run can be carried out. Before the test run, check whether the rotation direction of the motor is consistent with the mark, and conduct the test run for 4H according to the pump operation regulations.

10) During the test run, the operation of each part of the pump shall be checked comprehensively, and the test run record shall be filled in, and the pump shall be handed over for use after it is normal.

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