Characteristics of imported claw type dry vacuum pump

The suction and exhaust process of the imported claw type dry vacuum pump is completed by the change of the volume of the closed cavity formed by the meshing of the pair of claw type rotors connected on two shafts, between the rotor and the inner wall of the pump chamber, and between the rotor and the clapboard. 

The structure of imported claw type dry vacuum pump generally adopts the form of multi-stage rotors in series or roots rotors in series with multi-stage rotors to form a multi-stage claw type dry vacuum pump.

The four stage pump cavities are in series in series, and each stage has a pair of claw rotors with conjugate meshing and synchronous reverse movement. The first stage of the fourth stage pump cavity is the suction stage, and its suction volume is larger than that of the last three stages, forming interstage compression. Four pairs of rotors are installed on two parallel shafts. The shafts are supported by bearings at the upper and lower ends. There are diaphragms between pump cavity stages and stages, and there are suction and exhaust channels on the diaphragms.

The motor is installed upside down, and the power is transmitted to the rotor shaft through the crossover gear. The rotor shaft is driven by a pair of synchronous timing gears, and the phase of the rotor is adjusted and fixed. There are small gaps between rotors and between rotors and pump cavity. The rotor is suspended in the pump cavity, which makes the overflow part free from any substantial contact friction and lubrication. This ensures that the claw pump can keep the limit vacuum, pumping speed and compression ratio unchanged for a long time, and has a long service life.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Roots vacuum pump unit will be widely used

With the continuous development of economy, roots vacuum pump unit also develops very fast, and because of its rapid development, vacuum pump factory thinks roots vacuum pump unit should be widely promoted and applied in China. Today, let's learn about the development of Roots vacuum pump unit.

1、 At present, almost all large or small high vacuum and medium vacuum systems at home and abroad are equipped with roots pumps in order to shorten the pumping time and improve the production efficiency. Therefore, the domestic roots vacuum pump must try to enter the international market on the basis of occupying the domestic market. In this way, we must further reduce the vibration and noise of the roots pump, thoroughly solve the problem of shaft seal oil leakage, and improve the pump The appearance quality of the pump can improve the smoothness and cleanliness of the pump;

2、 The sales of Roots vacuum pump units account for no more than 5% of the global sales volume of Roots pumps. The total sales volume of these five pumps is only 20%. The output of Roots pumps is not large, but the price of overseas Roots pumps (roots vacuum pump units) is much higher than that of domestic pumps;

3、 In order to meet the requirements of different limit vacuum degree, this kind of pump can be used in series. Generally, an air-cooled Roots pump is added in front of Roots vacuum pump unit, and the ultimate vacuum is one order of magnitude higher than that of the previous stage pump. Because there is no working medium in the pump cavity, this kind of pump is also a dry pump. At present, this kind of air-cooled direct exhaust air roots pump and its unit have been tested in petroleum, chemical, plastic, pesticide, steam turbine rotor dynamic balance, aerospace space simulation and other devices for a long time. Therefore, roots vacuum pump unit should be vigorously promoted and applied in China.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Structure characteristics of roots rotary vacuum unit

Roots vane vacuum unit can be used in various vacuum systems which need large pumping speed and low and high vacuum, which is closely related to its mechanism characteristics.

1、 An oil mist eliminator is installed inside the pump, which can effectively eliminate the oil mist in the gas discharged by the pump and avoid the pollution of the oil mist to the surrounding environment.

2、 The suction port of roots rotary vane vacuum unit is equipped with a check valve. When the pump stops, the check valve and the specially arranged hole in the pump can immediately isolate the pump from the pumped system, prevent the pump oil from returning to the pumped system, and maintain the vacuum degree of the pumped container at the same time. Therefore, this type of vacuum pump unit can not be equipped with a vacuum stop valve with air release It can reduce the user's use cost.

3、 The pump is equipped with an oil-gas separator, which, together with an oil mist eliminator, forms an effective noise elimination system, which can eliminate exhaust noise and avoid noise pollution.

4、 The pump and the motor are directly connected and installed, air-cooled and water-cooled pipes are not required, so this type of equipment is compact in structure and easy to install.

5、 The structure design of roots rotary vane vacuum unit is reasonable, the vibration is small, and it can work without anchor bolt.

The mechanism characteristics of roots rotary vane vacuum unit make it have the characteristics of high vacuum degree and wide range of pumping speed in use, which can greatly improve the working efficiency in many industries.

Vacuum Valves Classification

industrial vacuum pumps,vacuum furnaces

Dry Type Oilless Vacuum Pumps

Introduction of heat dissipation mode of water ring vacuum pump

When the water ring vacuum pump draws vacuum in the fields of petroleum, chemical industry, medicine and so on, due to the high working pressure, it will produce certain heat. If the heat can't be dissipated in time, it will affect or even damage the internal parts of the pump for a long time. At this time, we will take an effective way to dissipate heat, which is determined according to the heat of different parts of the pump body Now, the water ring vacuum pump manufacturer will introduce it to us!

1. Add lubricating oil: since the working vacuum of water ring vacuum pump is not very high, generally, 46 mechanical oil can be used to replace the vacuum pump oil. Generally speaking, before start-up, the oil level in the oil window at both ends of the pump shall not be less than 2 / 3 of the height of the oil window, and shall not be less than 1 / 2 of the height during operation.

2. Use of the unit composed of the front-end pump: the main pump of the unit is water ring vacuum pump, and other mechanical vacuum pumps such as liquid ring vacuum pump, rotary vane vacuum pump and slide valve vacuum pump are the front-end pumps. The automatic operation, automatic overheating and overload protection of the unit are achieved through various vacuum instruments and control equipment. According to different process requirements and different configuration of the front stage pump, the pump can be composed of one or more pumps and the front stage pump.

Heat dissipation is conducive to slowing down the use pressure of the water ring vacuum pump, prolonging the service life of the pump and improving the working efficiency of the pump. Therefore, when using the water ring vacuum pump, we should choose the appropriate heat dissipation mode to ensure that the pump can be used for a long time.

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Causes of low pressure of vacuum pump unit

Causes of low pressure of vacuum pump unit

Vacuum pump unit is a kind of high efficiency equipment, so it is widely used, but there are also some problems in use, such as low pressure, resulting in the unit can not achieve the expected use effect, affecting the normal use, so what is the cause of low pressure, how to solve it?

The main reasons for the low pressure of vacuum pump unit are as follows:

1. If the vacuum pump unit is not filled with water or properly vented, it can be checked whether the pump casing and inlet pipeline are all filled with liquid.

2. Suction head is too high, check the existing clean head.

3. The water head of the system is too high, check the water head of the system (especially the friction loss).

4. If the speed is too low, check whether the wiring of the motor is correct, whether the voltage is normal or whether the steam pressure of the turbine is normal.

5. The impeller diameter of vacuum pump unit is too small. Consult the manufacturer for the correct impeller diameter.

6. If the submergence depth of bottom valve or inlet pipe is not enough, consult the manufacturer for correct submergence depth or use baffle to eliminate eddy current.

7. The position of pressure gauge is not correct. Check whether the position is correct. Check the outlet nozzle or pipe.

8. If there is leakage in the air or inlet pipeline, check whether there is cavitation or air leakage in the inlet pipeline.

The problem of low pressure of vacuum pump unit may be the result of one or more reasons. If this problem occurs during the operation of the unit, stop the work in time for inspection, find out the cause of the problem, and then formulate a solution for the cause of the problem.

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Advantages of liquid ring vacuum pump

The old vacuum pump has obvious defects in use. For example, it can only transport and extract gases with relatively clean air quality. It is difficult to realize the application of vacuum pump for some air containing relatively high quality water vapor or relatively high condensed particles or some poisonous, flammable and explosive gases. At this time, the vacuum pump is difficult to use, the emergence of liquid ring vacuum pump is in line with the market demand, to meet the market trend, its main application advantages have been widely recognized.

The new liquid ring vacuum pump can satisfy the function of suction with water, and its structure is relatively simple. You can assemble it yourself. Because of the integrated control, it is more convenient to use. Even inexperienced people don't have to worry about damaging the delivery pump, so they can make vacuum containers in a vacuum environment. Relatively speaking, this way is safer and greatly improves people's work efficiency.

With the emergence of liquid ring vacuum pump, people can pump in a relatively special air environment. For example, in flammable and explosive gas, toxic gas or gas containing water vapor, or gas containing condensed particles, free vacuum environment can be generated, which is not easy to cause danger in the use process. It is also relatively safe for staff. At present, this kind of mechanical equipment has been widely used in medicine, food, metallurgy, chemical industry, textile, leather printing and dyeing industries, and has been widely used.

Because this kind of liquid ring vacuum delivery pump can meet the needs of bad working conditions, it has been widely used in many chemical fields, greatly improving the safety of users and preventing accidents.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Why oil free vacuum pump is widely used

The oil-free vacuum pump has the advantages of simple structure, easy operation, convenient maintenance and no environmental pollution. In order to use oil-free vacuum pump products at ease, it is very necessary to choose a regular manufacturer to buy products, and for the sake of operation, it seems that we must follow the instructions in the manual! Today's products are suitable for many industries and have many advantages. The following is an introduction to the relevant information of the products:

The oil-free vacuum pump has good durability. It is a vacuum pumping, compression and dual-purpose vacuum pump. It is a basic equipment with a wide range of applications to obtain vacuum.

Compared with the oil pump, the oil-free vacuum pump has the advantages of low vacuum degree, small air volume, small size, easy installation, simple maintenance, convenient movement, no oil smoke and no environmental pollution, especially in the laboratory with high requirements. It is also one of the regular equipment in the laboratory. Therefore, when choosing oil-free vacuum pump, the vacuum degree required to work should be determined first. If the true degree of demand is high, the selected vacuum pump should be higher than the required vacuum degree, otherwise, it will fail to meet the requirements of vacuumizing. Secondly, the pumping rate of oil-free vacuum pump should be slightly higher than the required pumping rate in the selection, so as to meet the needs. See if the extracted gas is corrosive. The corrosive gas will corrode the pump. Special materials must be used to meet the requirements.

Oil free vacuum pump products are widely used because of its many advantages. And with the continuous progress of society, the product has made a qualitative leap in all aspects.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Configuration of vacuum unit

Configuration of vacuum unit

Different vacuum systems require different vacuum degrees. Therefore, it is often necessary to complete by a set of vacuum units, that is, the vacuum pumps working in different pressure ranges are connected in series.

The vacuum pump on the high vacuum side can reach the vacuum degree required by the system, while the vacuum pump on the low vacuum side is directly discharged to the atmosphere. Obviously, the vacuum unit is a vacuum pump directly discharging the atmosphere. However, the high vacuum system generally needs three-stage units, and the medium vacuum system generally needs two-stage units.

It is difficult for a high vacuum pump and a low vacuum pump to form an effective high vacuum unit. There are several reasons for this. Flow continuity is one of them. The high vacuum pump has the limitation of pressure resistance of the front stage, that is, if the front stage is higher than a certain pressure, the pump cannot work normally. When the current stage pump reaches this critical pressure, the pumping speed will often decrease, so the exhaust flow of the former stage pump may be less than the exhaust flow of the main pump, and the inconsistent flow will destroy the requirements of flow continuity, which will inevitably cause the vacuum unit not to work normally. However, if another middle vacuum pump is connected between the high and low vacuum pumps, it can play a connecting role, with continuous flow, and each pump can work in the state. Roots pump can work in the middle vacuum range, which is suitable, so it is also called roots booster pump. Because of its low compression ratio, it can connect several PA to several hundred PA. When the three-stage high vacuum unit enters into a higher vacuum degree, because the exhaust flow of the main pump is significantly reduced, at this time, only a small front pump can maintain the continuity of pumping, which is often used in practice, so as to reduce the energy consumption of the unit.

Another reason why high vacuum units often need three-stage units is due to the limitation of suction pressure of high vacuum pump. All pumps have initial working pressure, and traditional high vacuum pumps are in the range of several PA. Therefore, the primary pump must be pre pumped to this pressure to start working. However, it often takes a long time for the front stage pump of direct exhaust to pump to this pressure, because the pumping speed of the pump is decreasing as the pressure decreases, especially for the vacuum unit with periodic pumping, there is a requirement for the time to reach the working vacuum degree. The longer the pre pumping time is, the longer the time to enter the working vacuum degree is. Therefore, adding a middle vacuum pump to cooperate with the front stage low vacuum pump can A short time to reach the main pump can work pressure, so that the system can enter the working pressure as soon as possible, to ensure the efficiency of the equipment.

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How To Choose The Right Pneumatic Valve

Water Ring Pump

dry rotary vane vacuum pump characteristics and application

dry rotary vane vacuum pump characteristics and application

Features of dry rotary vane vacuum pump:

1. As the dry-type pump will not produce oil vapor gas, the environment of the production workshop and the items to be treated will not be polluted. It is a vacuum equipment used in the purification workshop and other industries.

2. Compared with water ring vacuum pump, water ring pump is limited by geography and resources, and causes serious waste of water resources. At the same time, the humidity in the production workshop will increase sharply, which is very easy to cause the goods to suffer from wet deterioration, while the dry pump does not have these problems.

3. Dry pump does not need oil and water, so compared with other vacuum pumps, regular maintenance work can be greatly reduced.

4. The dry-type pump adopts the high-speed operation of multiple blades, which avoids the pulse fluctuation of other vacuum pumps' suction and exhaust, and the transmission and suction are very stable.

Application scope of dry rotary vane vacuum pump:

Compared with the general vacuum pump, the dry vacuum pump is more widely used. It can be applied to:

Capsule filling, capsule printing, medicine mixing, conveying, vacuum drying and medicine packaging machine on pharmaceutical machinery;

Vacuum drawing, bag opening and loading on the automatic packaging line;

Low energy consumption vacuum suction on printing machine;

High efficiency vacuum filling of various liquid injection bottles;

Vacuum molding of various concurrent products; air tightness test of object surface in vacuum;

Vacuum delivery and pasting of labels of cartons and bottles;

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Features of Roots vacuum pump

Roots vacuum pump is a kind of pump caused by two "8-shaped" relative rotating rotors, which causes volume change to produce vacuum, so it is also called positive displacement pump. During operation, it is necessary to have a continuous contact line at the point where the rotor of the pump is required to engage, so as to prevent gas from flowing back from the vent to the vacuum pump. Therefore, it is necessary to check the engagement of the two rotors frequently during operation. With the extension of construction time, the impeller has been worn for a long time, and restricted by the directional rotation, forming the non-uniformity of meshing space between the two impellers, and even collision, making the impeller appear a circular and solitary external depression.

1. It is necessary to install roots vacuum pump in a dry, well ventilated and clean place.

2. The ambient temperature of Roots vacuum pump is 5-40 ° C.

3. Roots vacuum pump has necessary horizontal device, and there should be enough space around for daily inspection and maintenance, so it is easy to install and disassemble.

4. After connecting the power supply, the direction of the motor shall be as shown by the direction arrow on the pump.

5. It is necessary to clean the pipes connecting the pumping vessel. There should be no impurities and other foreign matters, the diameter of the hole should not be less than the diameter of the pump port, and the length should be short to ensure that it has enough conductivity, and the pipe connection is necessary to seal.

6. It is necessary for the gas to be pumped to be free of solid particles entering the pump room.

Therefore, the two impeller rotors are worn in different degrees in terms of outer diameter and length, and the gap between the impeller rotor and the shell is also increased. Therefore, the vacuum degree of Roots vacuum pump is reduced, and the time is large and small. It is necessary to adjust and adjust the clearance between the impeller and the clearance between the end cover and the pump housing in time.

Roots Vacuum Pump

Piston Vacuum Pump

industrial vacuum pumps,vacuum furnaces

What about the leakage rate of water ring vacuum pump

With the development of vacuum industry, water ring vacuum pump has been widely used. In use, the most difficult problem for users is to detect the leakage rate of water ring vacuum pump. And it includes internal leakage and external leakage. The external leakage is better to detect, while the internal leakage is more difficult to handle. Here is a brief introduction to the leakage rate detection of the water ring vacuum pump:

1. Most of the internal leakage occurred on the equipment with water-cooled jacket. No doubt was found through checking the external leakage, but there were the following phenomena: the pumping speed of the mechanical pump was obviously low, the indication value of the vacuum gauge was low, the mechanical pump oil was quickly emulsified, and the iron-based parts in the vacuum chamber were obviously rusted. If the above conditions are met, internal leakage can be basically determined. Clean the inner wall first, and then pass cooling water to see if there is any wet point. The wet point is the leakage point.

2. Small leakage and micro leakage are difficult to check. The commonly used method is to use the ionization tube sensitive to some gases in high vacuum state to detect leakage, such as acetone or ethanol. Use a medical syringe to spray acetone or ethanol to the suspicious place. When it is sprayed to the leakage point, the pointer of the ionization meter will swing obviously. In this way, it is necessary to be patient and wait until the indicator value of the ionization meter is stable - that is, the pumping capacity and leakage rate of the vacuum unit are balanced, and then spray. It is better to repeat several times to confirm the leakage point.

3. For larger leakage point, flame method can be used. Based on the principle that air flow can make the flame deviate, vacuum first. For example, use candle or lighter to gradually search around the suspicious point, and it will be found that the flame deviates to the leakage point, then the leakage point can be found.

4. The stainless steel water ring vacuum pump can be selected. It has strong corrosion resistance and will not be used properly!

2BE3 Series Liquid Ring Vacuum Pump

2BV series Liquid ring vacuum pump

industrial vacuum pumps,vacuum furnaces

Introduction to the connection mode of water ring vacuum pump

1. When wrapping with polyester insulating tape, it is necessary to press half of the first circle, wrap 8-12 layers. After wrapping with water ring vacuum pump, wrap two layers with plastic tape for strength.

2. Strip the copper core of the cable on the water ring vacuum pump about 30-35mm long, and wipe the copper wire with abrasive cloth to make it bright. Similarly, strip the copper wire of the external three-core cable 30-35mm, and wipe it with abrasive cloth.

3. Insert the three core cable and the stripped copper wire part of the external cable in pairs, then bind and tie with a thin copper wire as shown in the figure, cut off the remaining part, and press flat with scissors to prevent tying.

4. The three wire ends shall be firmly welded with solder respectively, and the surface of the solder joint shall be smooth without burr and false welding. If the welding is not firm or smooth, the water ring vacuum pump shall be re welded until the requirements are met.

5. Wrap three wires together with plastic tape and bind two layers. The first layer shall be more than 50mm over the end of each conductor insulation layer and the second layer shall be more than 50mm over the end of the first layer.

6. After binding, take a basin of cold water to soak the wrapped thread in water safely. After 12 hours, use a 500V megohmmeter to measure the insulation not less than 50 megohm. Otherwise, bind it again until it meets the requirements.

7. The grounding wire of the water ring vacuum pump shall also be wrapped according to the wiring process requirements of the submersible cable.

Dry Type Oilless Vacuum Pumps

Liquid Ring Vacuum compressor

industrial vacuum pumps,vacuum furnaces

Wide application of vacuum unit

Wide application of vacuum unit

When the vacuum unit is used, it can be used to pump not only the general gas, but also the gas containing moisture, organic solvent or a small amount of dust. Compared with the general mechanical vacuum pump, it is not afraid of oil pollution, water gas and dust. Compared with the general water ring vacuum pump, it has the characteristics of high vacuum degree and high pumping speed under high vacuum degree.

Vacuum unit is widely used in chemical, electronic, mechanical, pharmaceutical, food sublimation drying, high altitude simulation test and other vacuum systems. Because the 2BV series water ring pump with high efficiency and energy saving is used as the front stage pump, jzj2b series vacuum unit has the advantages of high efficiency, compact structure, no leakage (2BV pump is designed as mechanical seal, different from the packing seal of 2SK Series), corrosion resistance (2BV uses aluminum bronze impeller), and high protection level compared with jzj2s series.

When the working fluid in the front pump of the vacuum unit is changed to oil, the limiting vacuum degree of the roots vacuum unit can be effectively improved (see the parameter table). The roots oil ring unit is a closed-circuit circulating system, which can reduce pollution and save water. Roots oil ring vacuum unit is widely used in vacuum impregnation, vacuum drying, vacuum degassing and other processes.

The working liquid of the pre-stage pump can also be organic solvent (methanol, ethanol, xylene, aniline, acetone and other organic solvents with low viscosity can be used) or other liquids. The pre-stage pump can be used as a closed-circuit circulation system, which greatly reduces the environmental pollution and greatly improves the recovery of organic solvent. The limiting vacuum is determined by the saturated vapor pressure of the working fluid.

Water ring pump is more advantageous than other vacuum pumps in vacuum unit, because it can pump out a large number of condensable steam, especially when the ability of removing condensable steam is not enough, or the solvent used can make the pump oil deteriorate and affect the performance, or the vacuum system does not allow oil pollution. In the selection of vacuum units, it is generally required that the limiting vacuum degree of the vacuum units should be half to more than one order of magnitude higher than the working vacuum degree in order to meet the use requirements, that is, the working pressure should be ≥ the limiting pressure × (5-10).

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

dry screw vacuum pump

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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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

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

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.

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Liquid Ring Vacuum compressor

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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