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

water jet vacuum unit working principle

Water jet vacuum unit (also known as jet vacuum pump, jet vacuum pump, jet pump, jet pump, water jet, jet, vacuum jet,)

Principle of water jet vacuum unit: a vacuum obtaining device that uses fluid to transfer energy and quality, uses water flow with certain pressure to spray out through nozzles symmetrically and evenly distributed into a certain side slope, and converges on a focus. Because of the high velocity of jet water, the pressure energy is changed into velocity energy, which reduces the pressure in the suction area and creates a vacuum. A number of high-speed water flows will be grabbed by the aspirated gas, which will be fully mixed and compressed through the contraction section of Venturi tube and throat diameter to exchange the molecular diffusion energy, and the velocity will be balanced. In the expansion section, when the velocity is reduced and the pressure is increased, the non condensable gas will be released when the pressure is greater than the atmospheric pressure and injected into the water storage tank (pool) from the outlet. Water is recycled by centrifugal pump to complete suction process.

Application of water jet vacuum unit: it is mainly used in vacuum suction process of various industries, such as material absorption and transportation, condensation, distillation and evaporation, concentration, decolorization and deodorization, oxygen supply and deoxidization, dry crystallization and filtration, chemical absorption, tail (waste) gas neutralization, vacuum pumping, vacuum modeling and other processes. It is widely used in light industry, chemical industry, chemistry, pharmacy, vacuum smelting, sugar making, salt making, monosodium glutamate, chemical fiber, paper making, food, plastic rubber, ceramics, large and medium hospitals, vacuum brick making, foundation pit dewatering, drainage, petroleum, environmental protection and other industries.

Structural features of water jet vacuum unit: the water jet is composed of pump cover, pump body, orifice plate and Venturi tube. It is made of cast iron, carbon steel, glass fiber reinforced plastic (FRP), reinforced polypropylene (PPR), glass fiber plastic composite and stainless steel. The orifice plate is made of molded epoxy phenolic resin, and the nozzle is made of polytetrafluoroethylene (commonly known as plastic king). Can adapt to different working environment and requirements. It can directly suck high concentration corrosive gas, inflammable and explosive gas, various liquids and granular media, and it can be used in environmental protection, tail gas absorption, dust reduction, environmental pollution improvement and working conditions, etc. it has incomparable advantages of mechanical vacuum pump and water ring vacuum pump.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

What are the components of water ring vacuum pump

The water ring vacuum pump is mainly used in the formation process of coarse vacuum. It is widely used in electric power, petrochemical industry, pharmaceutical industry, papermaking and other fields because of its advantages such as close to isothermal compression, insensitivity to dust, entrainment of liquid or large amount of water vapor by inhalation gas.

The water ring vacuum pump is mainly used in the formation process of coarse vacuum. It is widely used in electric power, petrochemical industry, pharmaceutical industry, papermaking and other fields because of its advantages such as close to isothermal compression, insensitivity to dust, entrainment of liquid or large amount of water vapor by inhalation gas.

In most applications, water ring vacuum pump uses water as working fluid, which is often called water ring vacuum pump. Among all the water ring vacuum pump products on the market, there are many different structures.

① According to the structure of suction and exhaust parts, it can be divided into cone pump and flat pump

② According to the stages of impeller, it can be divided into single-stage pump and double-stage pump. Among them, the cone pump and the flat pump have a single-stage impeller and two-stage impeller structure.

③ According to the process of suction and exhaust completed by each rotation of impeller, it can be divided into single acting and double acting vacuum pumps.

In the above vacuum pumps with different structures, each pump is composed of pump shaft, pump body, side cover, impeller, distribution plate (flat pump) or distributor (cone pump), shaft seal parts, bearing parts, etc. In the process of working, the parts contacting the working medium are called over-current parts, and the other parts are called non over-current parts.

Water Ring Vacuum Pump Operation Guide

Vacuum Pump Selection Guide

Water Ring Pump

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

Micro air pump

The essence of vacuum adsorption of micro vacuum pump: after the micro vacuum pump is powered on, the pressure difference between the negative pressure generated by the suction port and the external atmospheric pressure is used to firmly absorb the object through the contact elements such as suction cup, so as to hang, fix and move the object.

The next process of vacuum adsorption is the release of the adsorbed object. When it is necessary to release the sucked object, the pump must be shut down first, and do not continue to vacuumize. After the pump stops, the object will not fall off immediately, because the pump has a certain pressure holding capacity, and the vacuum will continue to maintain for a certain period of time (the length of time depends on the air leakage of the system).

But the actual situation is that the current micro air pump, micro vacuum pump and so on, including domestic micro air pump, micro vacuum pump and most foreign micro air pump, micro vacuum pump and so on, because of the internal process principle and other reasons, only allow the gas to flow from the air inlet to the exhaust port, and vice versa. It is not simple to reverse the motor to change the direction of air flow, so as to meet the requirements of releasing objects.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Magnetic pump

Magnetic drive pump is a new centrifugal chemical process pump based on centrifugal pump, which uses magnetic coupling to realize the non-contact transmission of torque, no shaft seal, full seal, no leakage, corrosion resistance and no pollution.

Magnetic pump is a kind of non leakage fluid conveying machinery without dynamic seal. It is mainly designed for the centrifugal pump in vane pump, which is usually composed of pump body, isolation sleeve and connecting parts to bear the pressure. There is a rotating permanent magnetic field on the outside of the seal chamber, which drives the magnetic rotor components in the seal chamber to rotate synchronously through the effect of magnetic field, while the rotor components in the seal chamber drive the impeller to work on the fluid.

Since there is no dynamic seal in the shielding seal cavity composed of stator components, and the rotating shaft driving the impeller to do work does not penetrate the shielding seal cavity, thus ensuring zero leakage and no pollution of the magnetic pump.

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Water Ring Pump

Principle and performance characteristics of reciprocating vacuum pump

Principle and performance characteristics of reciprocating vacuum pump

Unlike the principle type of reciprocating pump transmission medium, the reciprocating vacuum pump is also a kind of equipment that uses the cylinder and the piston to reciprocate to generate suction, the difference is that one conveys the medium and draws a vacuum. Because the working medium of the reciprocating vacuum pump is gas, when the piston runs to the outer dead point, the stress will expel the gas in the cylinder as much as possible, so as to avoid too much residual gas and cause the piston to move inwards.This part of the gas expands and reduces the suction the amount.

Of course, compared with the structure of the intake valve and the discharge valve of the reciprocating pump, the structure of the intake valve and the exhaust valve is also different. When the eccentric wheel 2 on the main shaft of the reciprocating vacuum pump with a plane slide valve gas distribution mechanism rotates, the joystick 3 is driven to reciprocate, thereby driving the plane slide valve in the slide valve gas distribution mechanism 1 to make it reciprocate. The eccentric angle of the eccentric shaft is 90oa.

The flat slide valve gas distribution mechanism is an important feature of the reciprocating vacuum pump that is different from other delivery pumps:

Reciprocating vacuum pump plane slide valve gas distribution mechanism. There is an inverted "II" shaped air passage on the spool valve. When Huozhai moves to the dead point, the flat spool valve is in the middle position, and no high-pressure gas discharged from the cylinder clearance passes through this "II" shaped gas. Flow into the working chamber on the other side of the piston, that is to say, through this "n" shaped air passage, the pressure on the exhaust side is reduced, so that a considerable part of the exhaust side has not been exhausted into another instance, which can be Discharge on one side. In this way, the working efficiency of the cylinder of the vacuum pump is improved, and the pressure on both sides of the piston dead point is balanced.

The plane slide valve gas distribution mechanism mainly plays the role of pressure balance. The ratio of exhaust pressure to intake pressure is called the pressure ratio. If you want to get a 95% vacuum, when the suction pressure is 38x33.32Pa and the discharge pressure is 760x133.2Pa, the pressure ratio is ￡ one chip and two 20. In the case of such a high pressure ratio, the volume coefficient is easy The drop is so low that the pumping rate drops to near zero. Therefore, measures to improve the volume coefficient must be taken in the structure. This measure is generally a method of pressure balance.

Due to the complexity of the structure of the reciprocating vacuum pump, it also determines the difficulty of its maintenance. However, it does not need to be lubricated by Youfu, and it is also widely used in many fields. In order to better utilize the performance of reciprocating vacuum pumps and improve the needs of industrial production, in recent years, continuous research has been carried out, and many manufacturers have carried out good pumps. The improvement, for example, the plane slide valve is changed to the automatic spring intake and exhaust valve in the compressor, which not only simplifies the pump structure, but also provides side speed, of course, the pump volume can also be reduced.

Roots Vacuum Pump

Dry Type Oilless Vacuum Pumps

industrial vacuum pumps,vacuum furnaces

Water ring compressor

In order to improve the production efficiency of the enterprise, enhance the application strength of the overall development of the enterprise, enhance the practical application of water ring compressor products with high standard management mode, highlight the improvement of the whole product performance, further expand the actual application effect, accelerate the advantage level driven by the product strength, and improve the actual development performance of the product with the application ability of the equipment The promotion of the company has fully increased the embodiment of its strength in various aspects, and accelerated the drive of its productivity with a reliable level of development.

Through the application strength of water ring compressor, it is necessary to realize the advantage level of its application performance development with high quality product quality, develop the performance ability of its product advantage function, improve its value strength through reliable practical performance, enhance its actual development ability with reliable product performance, and further accelerate the continuous embodiment of the enterprise's practical advantage level, Thus, the operability of the equipment can reflect the internal value advantages, so that it can give full play to the promotion of product application strength.

From the perspective of the development of water ring compressor, the advantage level of its product's actual performance has continuously accelerated the application effect of the enterprise. From the development advantage level of the whole equipment, it is necessary to highlight the driving force of its product strength, realize the development advantage of its application value ability, and fully enhance the driving force of its product application strength.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

High performance vacuum unit

To expand the performance advantage of the overall improvement of the enterprise productivity, in the process of accelerating the driving of the product utilization advantage, we should make use of the advantage of the vacuum unit, accelerate the improvement of its product utilization ability, realize the continuous development of the product application performance and quality strength, increase the performance strength of the unit equipment through reasonable operation specifications, and further serve the enterprise Industry provides reliable equipment applications.

To speed up the overall development of enterprise productivity, we should make full use of the actual effect of all aspects of the application of the product, highlight the overall improvement of its advantages, highlight the driving force of the quality and performance of the vacuum unit in the application process of improving the application ability of the product, so that it will not Strengthen the performance of the product's own value ability and realize the overall promotion of the application effect in all aspects.

Through the vigorous application of the vacuum unit equipment, its high-performance product strength has highlighted the driving force of its overall advantages, expanded the application effect of the overall development of the enterprise, constantly improved its quality application advantages with reliable product application strength, and developed the overall improvement of all aspects of performance.

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Water Ring Pump

How to apply screw vacuum pump

In the long-term use of screw vacuum pump, there may be problems: oil return. In addition to the screw vacuum pump without check device, this phenomenon is more obvious when the screw vacuum pump stops working. Taking measures in time can reduce the loss. The placement position of the screw vacuum pump has nothing to do with the return oil.

When the pump stops, the oil circuit is cut off, the negative pressure in the vacuum pump cavity of the pump is eliminated, the liquid level difference is reduced, and the oil return quantity is reduced. This is the basic principle to prevent oil return. The shaft seal and static seal of the screw vacuum pump shall be reliable and replaced when appropriate. The oil near the exhaust valve of the screw vacuum pump shall be separated from the rest of the oil. The oil level is only slightly higher than the partition wall?

The surface of the valve seat of screw vacuum pump should be flat, and the elasticity of the valve plate should be good? Set check valve structure, screw vacuum pump will automatically close the oil inlet when it stops, move the fuel tank and exhaust valve to one side to reduce the oil level and oil volume, add a pipe in the oil hole of screw vacuum pump, so that the oil level is only slightly higher than the oil inlet.

Screw vacuum pump suction valve? Screw vacuum pump and auxiliary structure are set to cut off the oil circuit when the pump is stopped? After stopping the pump, the suction port can be filled with gas to ensure the pressure balance at both ends of the screw vacuum pump. It is recommended to replace the check valve at the air inlet. Because of the vacuum pumping, when the screw vacuum pump stops running, the air pressure in the vacuum cavity is lower than the external pressure, the oil in the screw vacuum pump will be pumped out, resulting in oil return.

Dry Scroll Vacuum Pump

Dry Screw Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Explain the advantages of water ring vacuum pump

The water ring vacuum pump is equipped with an axial force motor rotor with fixed blades, which throws water (liquid) to the stator wall of the motor. The water (liquid) occurs in the same boat with the stator of the motor. The liquid ring and the rotor blades of the motor form a variable capacity imported true air pump. So what are the advantages of water ring vacuum pump? Here is a specific introduction.

The structure is simple, the production accuracy is not high, very simple production and processing; the structure is compact, the pump speed is relatively high, usually can be directly connected with the motor, without speed reduction equipment. Therefore, with a small structure standard, it can have a large displacement and a small floor area; most of the compressed air is isothermal, that is, the temperature of the whole process of the compressed air changes little; because there is no metal material conflict with the surface layer in the pump cavity, it is unnecessary to carry out the humidification in the pump, and the damage is not big.

The airtightness of the rotating parts and the fixed card center can be immediately carried out by the exhaust valve; the water ring vacuum pump also has the advantages of uniform suction, stable and reliable operation, convenient use, quick maintenance, etc. Together with the water ring vacuum pump is mainly used in coal, chemical plants, pharmaceutical industry, mining, paper industry, food, wine, decoration building materials, plastics, metallurgy, electrical and other industries.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Brief introduction of mechanical vacuum pump

A pump that uses mechanical movement (rotation or sliding) to obtain vacuum is called a mechanical vacuum pump. According to its working principle and structural characteristics, mechanical vacuum pump can be divided into the following categories: variable capacity vacuum pump: it uses the periodic change of pump cavity volume to complete the work of the pump. Suction and discharge. A vacuum pump for pumping water. The gas is compressed before leaving the pump room. This type of pump is divided into two types: reciprocating pump and rotary pump.

Reciprocating vacuum pump: reciprocating the piston in the pump room to suction, compress and discharge gas. This product is also called piston vacuum pump. The vacuum degree of this kind of product is usually about 1330pa, and the normal working pressure is 1330pa? 105Pa. It is mainly used for the process of removing air or containing a small amount of condensable gas, and the vacuum degree is not high.

Such as vacuum molding, vacuum concentration, vacuum impregnation, material vacuum transportation and other processes, rotary vacuum pump: This product uses the rotary motion of the rotor components in the pump room to pump, compress and discharge gas. It has the following classification: oil seal vacuum pump: it is a rotary variable displacement vacuum pump, which uses vacuum pump oil to seal the gap between moving parts in the pump and reduce harmful space in the pump.

Such pumps usually have gas ballast. It mainly includes rotary vane vacuum pump, fixed plate vacuum pump, slide valve vacuum pump, cycloid vacuum pump, etc. the vacuum degree of such products is usually about 0.05 to 0.5pa, and the normal working pressure is 0.5 to 103pa or higher. It is mainly used in the process of removing air or containing a small amount of condensable gas and requiring high vacuum.

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Roots Vacuum Pump In Vacuum Precooling Device

Water Ring Pump

Water ring vacuum pump with air ejector

The air ejector is a pre air ejector on the inlet pipe of the water ring vacuum pump. One end of the air ejector is open to the atmosphere. The air jet generated by the pressure difference between the negative pressure of the vacuum pump and the atmospheric pressure is used to obtain a lower suction pressure in the ejector than the vacuum pump, so as to eliminate the limitation of the "suction pressure" of the vacuum pump on the pressure improvement of the condenser. In practical application, it can be used to increase the pressure of equipment and expand its working range.

The suction area is in a vacuum state, the water after local vaporization rotates with the impeller, the pressure rises and the bubble breaks, and local cavitation occurs on the impeller surface. After the water ring vacuum pump is equipped with an air ejector, the air flow of the pump suction is greatly increased, and the pressure in the suction area of the vacuum pump is much higher than the "suction pressure" corresponding to the water ring water temperature. When the generator unit operates in winter, the pumping performance of the whole vacuum pump unit will be better, so the condenser vacuum can still be guaranteed at the current level or higher, but the internal vacuum degree of the equipment body is only At about 12kpa, the cavitation is effectively avoided, and the operation condition of the equipment is relatively stable, so the noise is smaller.

The cavitation of the vacuum pump after the installation of the air ejector can be effectively contained, that is, the service life of the equipment is extended, the operation reliability of the equipment is improved, and the safe operation of the unit is more guaranteed.

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Vacuum unit used in rare metal metallurgy

The process of vacuum system obtaining vacuum is called vacuumizing, also called vacuumizing or exhausting. The volume of gas pumped out per unit time under the specified air pressure is called pumping rate, i.e. pumping speed. It can also be called pump speed, and the unit is L / s. The minimum air pressure that a pump or a vacuum system can reach after exhausting for a long enough time is called ultimate vacuum degree

High vacuum condition is required for thin oil metallurgy. Therefore, a complete set of high vacuum unit equipped with mechanical pump and diffusion pump is often used. The vacuum can be pumped to 10-6pa in series with mechanical pump and booster pump. In order to further improve the vacuum degree, the adsorbent can be put in the working system or a cold well can be installed to absorb or condense the gas that has not been pumped out by the pump. Sometimes, the first level mechanical booster pump and unit are added In series or parallel connection, to improve the pumping capacity in a certain vacuum range.

In the high vacuum unit, the mechanical pump can reduce the air pressure from one atmospheric pressure, which is called the front stage pump; the diffusion pump can only pump from the lower air pressure to the lower air pressure, which is called the secondary pump. The air pressure at which the secondary pump starts to work is called the pre vacuum or pre vacuum. The best pumping speed of each kind of vacuum pump is corresponding to a certain inlet pressure. Therefore, it is necessary to allocate a reasonable vacuum unit in order to obtain the best vacuum efficiency. An unreasonable configuration will not only cause waste, but also cause the vacuum degree of the air system to fail to meet the expected requirements.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Great advantages of vacuum pump in practice

In the whole process of using water ring vacuum pump, we should contact the improvement of its commodity function, speed up the continuous development of its commodity application ability, enhance the development of its useful value with solid function, make it improve the development strength of commodity function continuously in the strength of stock commodity, outstanding the improvement of its all use advantage, and make it used reasonably In the process, it reflects the quality advantages of the equipment itself and improves the quality of the company's performance of all the talents.

In order to better show the advantages and talents of water ring vacuum pump, it is necessary to promote the quality function of all improvement according to the stock movement of all functions of the commodity, complete the whole performance of its value strength, increase the development advantages of its application ability, use all features of all useful functions in all aspects, and increase the embodiment of its commodity advantage ability, so as to enhance the development of commodity application and function strength In the process of exhibition, we will continue to accelerate the promotion of its commodity utilization and function advantage.

Solenoid Valves Types

What Is A Solenoid Valve

Water Ring Pump

Operation of roots water ring vacuum unit

Roots vacuum pump (hereinafter referred to as roots pump) is a kind of mechanical vacuum pump which uses a pair of high-speed rotating double leaf rotors (i.e. "s" shape, straw shoe type) to pump out gas. Its structure and working principle are similar to roots blower. Because the gap between the pump rotor and the cavity is often small (0.1-0.15 mm), so as to ensure that there is a large pumping speed between 10-1-10-2 Torr, which just makes up for the defect that the pumping speed of the oil seal mechanical pump and the oil diffusion pump is very small in this pressure range, and plays a role of increasing pressure in the vacuum system, so it is also called the mechanical booster pump.

Under high pressure, the average free path of gas molecules in roots pump is smaller than the width of the gap (< 0.1-0.15mm). Relatively speaking, the gap has a considerable conduction capacity, which is easy to make a large amount of gas flow back to the pumped container through the gap, so that the pump can not work effectively. On the contrary, under low pressure, the average free path of gas molecules increases, and the conduction capacity of the gap decreases greatly Small, that is to say, the resistance of gas leakage through the tiny gap increases, so that the pump can work effectively and obtain a higher compression ratio, that is to say, a higher vacuum degree.

Therefore, the roots pump can not directly discharge the gas to the atmosphere, so it must be equipped with a pre vacuum pump, so that the exhaust end of the roots pump creates a certain pre vacuum, otherwise it can not obtain a higher vacuum degree. And the rotor will be stuck or even damaged due to overload and overheating.

According to the purpose of the air extraction system, the pre-stage pump required by roots pump can select the pump that can operate from atmospheric pressure, such as the air pump of oil seal machinery, water ring vacuum pump, and water ring vacuum pump with air ejector, etc. The size of the front stage pump, according to the conditions of use and the pumping characteristics of the front stage pump, is generally 1 / 10-1 / 2 of the roots pump pumping speed. When the pump operates continuously under high pressure, the front pump with large pumping speed shall be selected. When the pump operates under high vacuum, the front pump with small pumping speed shall be selected. For the oil seal mechanical vacuum pump, the pumping speed is only 1 / 4-1 / 10 of that of Roots vacuum pump, but when the water ring vacuum pump is selected, the air volume should be 1 / 2 ^ - 1 / 3 of that of roots pump; in addition, when the small roots pump is used between roots pump and the front pump, the pumping speed is 1 / 2.5-1 / 5 of that of the large roots pump.

In many cases, water ring vacuum pump is more advantageous than other vacuum pumps. This is not only because the water ring vacuum pump has the advantages of simple maintenance, convenient operation and few faults, but also because it can pump out a lot of condensable steam. When the ability of removing condensable steam is not enough, or the pumped gas will deteriorate the pump oil and affect the performance, and the vacuum system does not allow oil pollution, the use of water ring vacuum pump is more effective Profit.

Roots Vacuum Pump

Piston Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Oil free vacuum pump

The working fluid of two series of rotary vane vacuum pump and water ring vacuum pump is used as the working fluid to seal the vacuum pump oil and water, so as to achieve the purpose of vacuum pump. However, in some vacuum processes, oil-free vacuum pump is required, which is a single-stage rotary vane vacuum pump. A basic device used to extract gas from a sealed container to obtain a vacuum.

The pump can be used for air conditioning, refrigeration equipment repair, medical equipment suction device, printing machinery, vacuum packaging, vacuum plastic suction, physical and chemical experiments and small devices that need vacuum environment. It can also be used as a small oil booster pump, oil diffusion pump, molecular pump, etc. The pump is not suitable for pumping out the gas which corrodes the ferrous metal, reacts with the pump oil, contains the particle dust, and contains the toxic gas which is too high in oxygen and explosive. It can not be used as a transfer pump (i.e. pumping from one container to another).

Oil free vacuum pump series rotary vane vacuum pump is a kind

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump
of mechanical vacuum pump which can run without any oil. The utility model has the advantages of simple structure, easy operation, convenient maintenance and no environmental pollution. The two series of oil-free vacuum pumps have good durability. They are vacuum pump, compression pump and dual-purpose vacuum pump. They are a basic equipment with a wide range of applications to obtain vacuum.

Characteristics of Roots vacuum pump

The positive exhaust blower can be used in series with the vane pump to obtain a higher pumping speed and lower ultimate pressure under medium vacuum than when the vane pump is used alone. Roots pumps, or roots blowers, consist of a pair of cocoon shaped rotors mounted on two parallel shafts. The clearance between the rotor itself and between the rotor and the pump housing is typically about 0.2mm. The two rotors rotate synchronously in reverse from 3000rpm to 3500rpm. Since the clearance between the rotor and the pump casing is not sealed by oil, such a speed is feasible.

The compression ratio of roots pump, or the pressure ratio of the inlet and outlet of the pump, is related to the pressure, and its maximum value is usually close to 100Pa. At a higher pressure, the compression ratio of the pump is smaller, which is due to the increase of the conductance in the clearance with the increase of the pressure. At low pressure, theoretically, the compression ratio should be kept constant, but actually it is decreased. The roughness of the outlet gas and the rotor surface makes the compression ratio loss at low pressure. When the rotor faces the high-pressure side, the gas will be adsorbed on the rotor surface, and when the rotor faces the low-pressure side, part of the adsorbed gas will be released. The maximum compression ratio is 44. The compression ratio of large J pump is higher than that of small pump, because the clearance of large pump is smaller than that of pump volume. The compression ratio of a light gas like nitrogen is 15-20% smaller than that of air. Compression ratio is a static quantity, which is obtained under the condition of zero flow. During the measurement, the air inlet of the pump is sealed and connected with a pressure gauge, and the air outlet is connected with the one-in-one coarse pumping pump, and the whole system is aspirated. Put the gas into the front pipe connecting the roots pump and the vane pump, measure the pressure P (front pressure) at the exhaust port of the roots pump, and measure the pressure P1 at the air inlet. The compression ratio is derived from P / P1.

When using roots pump to exhaust under high pressure, considerable heat will be generated, which will cause the rotor to expand and may damage the pump. In order to avoid overheating, the maximum pressure difference between the air inlet and the exhaust port of roots pump is specified. The maximum pressure difference is generally 1000Pa, but exceeding this value in a short time will not cause damage to the pump. In order to avoid heating, roots pump is connected by means of compression pump or transfer pump.

In the more common way of compressed exhaust, roots pump and vane pump are used in series. The rated pumping speed of vane pump is 5 to 10 times lower than that of roots pump. When pumping from atmospheric pressure, the bypass pipe bypassing the roots pump shall be opened or the roots pump shall be idle. At this time, the mechanical pump is responsible for all air extraction until the pressure of the previous stage is lower than the pressure difference recommended by the manufacturer, then start the roots pump and close the bypass valve. Some roots pumps have this bypass feature on the pump body.

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Water Ring Pump

importance of cleaning dry vacuum pump

Keeping the dry vacuum pump clean can guarantee the performance of the vacuum pump. No matter what kind of equipment, if any pollutant enters, it will affect the normal operation of the equipment. This is the case with the vacuum pump. Even if a particle enters the key operation part of the vacuum pump, it is likely to cause damage to the vacuum pump.

Dry vacuum pump is composed of many different parts, which are all finished by various machining, such as turning, milling, planing, grinding, filing, welding, etc. In this way, the surface of parts will inevitably be stained with a lot of processing grease, sweat marks, polishing paste, flux, metal chips, oil scale and other pollutants. These pollutants are easy to volatilize in vacuum and affect the vacuum of vacuum equipment. In addition, pollutants absorb a large number of gases at atmospheric pressure. In vacuum environment, these gases will also be released. The factors controlling the vacuum of dry vacuum pump are constituted. For this reason, contaminants must be removed before parts are assembled.

During the use of dry vacuum pump, the parts will be polluted. The pollution is related to the service conditions and vacuum pump. For example, the vacuum drying system will be polluted by the evaporated materials after being used frequently; the inner wall of the vacuum coating machine will be polluted by the evaporated materials; the inner wall of the ion beam etching equipment will be polluted by the sputtered splashes of the workpiece; the filament of the electron gun in the vacuum will form a metal film on the nearby surface due to the high temperature evaporation; the gauge filament will evaporate under the high temperature to make the ceramic insulator shape Film forming, damage insulation strength, affect the accuracy of measurement. The mechanical pump oil and diffusion pump oil in the vacuum system are more pollution sources. After the equipment works for a long time, obvious oil film will be formed inside the equipment. These pollutants will also affect the performance of the equipment, and should be removed at any time.

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water pump selection principle

The key to the selection and matching of water pump lies in the rational selection of water pump. Pump type selection is to determine the type, model and number of pumps according to the characteristic lift, design flow and its change rule of pump station.

(1) It should meet the requirements of design flow, design head and water supply and drainage in different periods.

(2) In the long-term operation of water pump, the efficiency of pump station is high and the operation cost is low under the multi-year average head; in the highest and lowest head, the water pump should be able to operate safely and stably without leaving the working range of high-efficiency area of water pump. Under various working conditions of the design standard, the pump unit does not appear cavitation, vibration, overload and other phenomena.

(3) Series, standardization and renewal products are preferred. The pump type with good performance, wide high efficiency area and suitable for the change of pump head and flow shall be selected. When the series of products can not meet the requirements, new products can be developed and trial manufactured according to the specified procedures. For the pump station with large head variation, the pump with steep Q ~ H curve should be selected; for the pump station with large flow variation, the pump with gentle Q ~ H curve should be used.

(4) According to the selected unit to build the station, the equipment investment and civil construction investment are required to be the most economical, easy to construct, operate, maintain and manage.

(5) For cascade pump station, the model and number of pumps shall ensure the flow coordination requirements between the upper and lower pump stations.

(6) Try to take into account the characteristics of comprehensive utilization and development of water conservancy.

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Flow and head of circulating water pump

The flow determination of circulating water pump should follow the following principles

(1) When circulating water by-pass filtration is adopted, the maximum hourly water consumption plus by-pass filtration shall be the maximum hourly design water consumption of circulating water pump

(2) When circulating return water bypass filtration is adopted, the maximum hourly water consumption shall be the maximum hourly design water consumption of circulating water pump. Determine the head of circulating water pump. The total head of circulating water pump shall include the sum of the following values.

(1) The elevation difference between the allowable lowest water level elevation (or lowest water pressure elevation) at the water pump suction pipe and the terrain elevation at the most unfavorable point in the system. (Note: the most unfavorable point refers to the highest total head of water pump calculated according to this point)

(2) The required working water pressure at the most unfavorable point.

(3) Head loss of water pump suction and discharge pipes (including system pipes).

(4) The sum of head loss plus suction height and steam partial pressure of suction pipe shall be less than the allowable suction height provided by pump sample.

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What are the sealing requirements of vacuum pump

Vacuum pump is a common vacuum equipment, so what are the sealing requirements of vacuum pump?

Under its working pressure, the vacuum pump should be able to discharge all the gas produced in the process of vacuum equipment. Combine the vacuum pump correctly. Because of the selective pumping of vacuum pump, sometimes selecting one pump can not meet the pumping requirements. Several pumps need to be combined to supplement each other to meet the pumping requirements. For example, the titanium sublimation pump has a very high pumping speed for hydrogen, but it can't pump helium, while the three pole sputtering ion pump (or the two pole asymmetrical cathode sputtering ion pump) has a certain pumping speed for argon, and the combination of the two will make the vacuum device get a better vacuum degree.

Vacuum pump can not work under atmospheric pressure, need pre vacuum, some vacuum pump outlet pressure is lower than atmospheric pressure, need pre pump, so we need to combine the pump. Requirements of vacuum equipment for oil pollution. If the equipment is strictly oil-free, various oil pumps should be selected, such as: water ring pump, molecular sieve adsorption pump, sputtering ion pump, low temperature pump, etc. If the requirements are not strict, oil pump can be selected, and some anti oil pollution measures, such as cold trap, baffle, oil trap, etc., can also meet the requirements of clean vacuum.

The vacuum pump shall be installed in a solid place on the ground, and there shall be sufficient space around it for inspection, maintenance and repair. The foundation level shall be kept under the vacuum pump base. It is recommended to pad damping rubber or install it with bolts at the four corners of the base to ensure the smooth operation and small vibration of the vacuum pump.

The connecting pipeline between vacuum pump and system shall be sealed reliably. For small vacuum pump, metal pipeline connection gasket can be used, and oil-resistant rubber can be used. For small vacuum pump, vacuum rubber pipe connection can be used. The pipe diameter shall not be less than the suction diameter of vacuum pump, and the pipeline shall be short with few elbows.

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Roots vacuum pump unit extraction rate

Roots vacuum pump set should consider various parameters, such as working efficiency and pumping speed. Each problem may be the cause of equipment failure. Therefore, in order to better use the device, we need to further understand and understand it. Today I will concentrate on you. A simple analysis of the pumping speed of the Roots vacuum pump unit, I hope to help everyone.

The pumping speed of the Roots vacuum pump unit varies greatly due to the difference in the front pump and the working pressure. In the design, the roots vacuum pump unit should have good applicability and economy according to the specific working conditions and the requirements of the vacuum system.

When the Roots vacuum pump is used in vacuum engineering, it is usually connected in series with the front vacuum pump, such as a rotary vane pump, spool valve pump, water ring pump or other dry pumps that directly discharge the atmosphere to form a unit. Used as a mechanical booster pump in the medium and low vacuum range. The working principle is the same as the Roots blower. The actual pumping speed of the Roots vacuum pump is closely related to the theoretical pumping speed and the zero flow compression ratio.

 In summary, the pumping speed parameter of the Roots vacuum pump unit is a very important parameter in practical applications. I hope that by understanding the pumping rate of the equipment, you can better understand the points of use of the equipment.

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How to prevent scaling of vacuum pump

Vacuum pump in use for a period of time will scale, these dirt will affect the normal use of vacuum pump, then, how to prevent vacuum pump scaling?

1. Hardness of circulating cooling water

The operation process of circulating water in vacuum pump is very similar to that of boiler water in low pressure hot water boiler. Therefore, to manage the water quality of vacuum pump according to the water quality standard of hot water boiler can not only prevent the scaling of vacuum pump, but also prevent the corrosion of vacuum pump.

Most of the circulating water systems of vacuum pump are open circulation systems with high return rate. In the case of not using ion exchange equipment for water treatment due to capital and other reasons, a softened water tank and a high water tank are generally used to supply water to the vacuum pump.

2. Temperature control of circulating cooling water

From the above analysis, it can be seen that the difference between the water ring temperature in the vacuum pump and the water temperature in the softened water tank is an important factor leading to scaling. Therefore, increasing the circulating water supply and improving the cooling effect is an important guarantee to minimize the scaling rate.

Therefore, in the process of circulating cooling water operation, it is necessary to monitor the return water temperature and return water volume of each pump to ensure that the normal water supply and return water temperature of each pump do not exceed 40 ℃. The water supply can be controlled by valves. If the return water temperature exceeds the requirements, it is necessary to supplement low-temperature cold water or use other cooling methods to reduce the temperature of the softened water in the softened water pool.

3. Wash the pump body regularly

The pump body drain gate valve of the water ring vacuum pump can not only discharge the accumulated water in the pump normally, but also wash the dirt and water slag in the pump regularly by using the water pressure of the pump body during the operation. On the one hand, it can prevent the dirt from accumulating, on the other hand, it can prevent the water slag from transforming into the scale.

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High vacuum system with throttling

The pressure range of sputtering and other plasma processes is higher than that of all kinds of high vacuum pumps. Adding a throttle valve between the pump and the vacuum chamber can use these pumps in the range of 0.5 to 10 PA. This kind of throttle valve with small flow guide allows the gas from the high pressure and strong vacuum chamber to flow into the pump, while keeping the pressure of the air inlet of the pump below the maximum pressure or critical air inlet pressure of the pump. The diameter and height of the typical sputtering chamber with cathode diameter of 150-200mm are 5oomm and 250mm respectively.

The traditional pumping unit is equipped with a 6-in diffusion pump, but there are also low-temperature pumps or turbo molecular pumps that are equivalent to them. The maximum discharge capacity of such a pump is 100-200pa · L / s. The pump is bigger, and although it's more expensive, the gas removal rate is faster.

The problem of residual gas in sputtering system is much larger than that in high vacuum evaporation system. On the one hand, the plasma desorption of impurities on the wall is increased, on the other hand, the deposition rate of sputtering is much lower than that of typical evaporation rate. Even if the production rates of the two processes are in the same order of magnitude, the chance of the sputtered films exposed to residual gas impurities is more than that of the films condensed from the evaporation source. Electron ion collision desorption is an effective way to release gas from the wall of vacuum chamber. It is even more effective than light baking. In a plasma, the desorption gases appear as atoms, so that they can easily react with the sputtered film.

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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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What is water ring vacuum pump

What is an air-cooled Roots vacuum pump

Air cooled roots vacuum pump is a kind of Roots vacuum pump which can operate continuously under high pressure difference without overtemperature. It also has the advantages of high speed and small volume of ordinary roots vacuum pump. Its work and capital depend on the mechanical strength of the pump itself.

Air cooled roots vacuum pump adopts three blade rotor profile, which has large volume utilization coefficient and small volume. Equipped with a suitable motor and condenser, it can be started at any pressure or operated at any differential pressure. The air-cooled Roots vacuum pump can be used alone or form a unit. In some cases, that is, in the middle stage of the unit, the air-cooled Roots vacuum pump relies on the cooler outside the pump to achieve heat balance. If it is used as the end stage of the unit or separately, it can be cooled by air without condenser.

The pump and unit can reach various limit pressures and working pressures. Air cooled roots vacuum pump and unit 1 can be selected under the following conditions.

1. The load is very large;

2. Short extraction time;

3. High pumping speed is needed from low vacuum to high vacuum;

4. It is necessary to avoid the situation of ordinary pump working medium.

The pump and unit can be widely used in vacuum melting, vacuum drying, vacuum impregnation, vacuum distillation, vacuum degassing, aviation simulation experiment, gas transmission, vacuum suction, power station dust removal and other vacuum operations.

1、 How it works

When the air-cooled Roots pump is running, the extracted gas is vertically inhaled and vertically discharged. There are cooling air outlets at both ends of the pump to provide cooling air for the pump or use a cooler for cooling.

During the operation of the air-cooled pump, the rotor is driven by two synchronous gears, which rotate synchronously and reversely in the pump body, forming the process of upper air inlet, side air conditioner and lower air exhaust. Through the dynamic balance test, the rotor runs smoothly, the gearbox and lubricating oil are completely separated from the working chamber, and the working chamber is free of oil.

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Characteristic curve of water ring vacuum pump

For different types of water ring vacuum pumps, the suction volume flow curve is related to the suction volume cavity and the size of suction port: when the suction port is small and the suction volume cavity is relatively large, the suction volume flow increases with the increase of suction pressure; When the suction volume cavity is relatively small, with the increase of suction pressure, the suction volume flow will be full of the whole cavity when the suction volume flow increases to a certain value. When the suction port is large and the suction volume cavity is relatively small, the speed of air filling the cavity is faster to keep the suction volume flow unchanged. When the inspiratory pressure increases to a certain value, the inspiratory pressure in the volume cavity will increase and the inspiratory volume flow will decrease due to the constant inspiratory volume cavity and the continuous increase of the maximum flow rate of the inspiratory gas.

When the water ring pump is running, its suction temperature, working water temperature and suction cavity remain unchanged. According to the gas state equation PV = MKT, the suction mass flow is basically proportional to the suction pressure, that is, P1 / P'1 ≈ M1 / m'1

According to the relationship between inspiratory mass flow and inspiratory volume flow, with the increase of inspiratory pressure, inspiratory volume flow begins to increase, and then slowly decreases.

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Vacuum pump in vacuum grouting technology

Vacuum grouting is a commonly used technology in bridge concrete structure, and grouting is a key link. The traditional grouting technology will cause corrosion and component expansion crack after long-term use, which has a great potential safety hazard.

Vacuum grouting is a new technology in the construction of post tensioned prestressed concrete structure, which solves the problems left by the traditional grouting technology to a large extent. The adoption of vacuum grouting technology is an effective measure to improve the safety and durability of post tensioned prestressed concrete structure.

The main application of vacuum pump in vacuum grouting is that one end of the duct is vacuumized by vacuum pump to produce a vacuum of about - 0.1pA, and then the optimized special cement slurry is poured from the other end of the duct to fill the whole duct with a positive pressure of ≤ 0.7MPa to improve the fullness and compactness of the prestressed duct grouting.

Main technical advantages

1. In the vacuum state, the air and water in the duct and the bubbles mixed in the cement slurry are eliminated to reduce the porosity and bleeding.

2. In the process of grouting, the duct has good sealing performance, so that the slurry can keep pressure and fill the whole duct.

3. The optimization of technology and slurry can eliminate the generation of cracks and ensure the fullness and strength of grouting.

4. The vacuum grouting process is a continuous and rapid process, which shortens the grouting time.

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The working principle of different types of vacuum pump

The working principle of different types of vacuum pump

Different types of vacuum pumps have different functions and working principles, and the specific processes used are different. In this paper, the specific functions of various vacuum pumps are described as follows:

1. The working principle of Roots vacuum pump is: it has a pair of soled rotors with synchronous high-speed rotation, because of the continuous rotation of the rotors, The extracted gas is sucked into the gap between the rotor and the pump shell from the air inlet and discharged through the exhaust port. Since the gap is completely closed after suction, the gas in the pump cavity is not compressed and expanded. However, when the top of the rotor turns around the edge of the exhaust port and the gap is connected with the exhaust side, because of the high pressure of the gas in the exhaust side, a part of the gas in the side flows back into the gap, making the gas When the rotor continues to turn to the outlet, the gas is discharged out of the pump.

2. The function principle of water ring vacuum pump is: the impeller is eccentrically installed in the nearly circular pump body. When the impeller rotates clockwise, the water injected into the pump body forms a rotating water ring due to the centrifugal effect, and a crescent shaped space is formed between the inner surface of the water ring and the impeller hub. When the space increases, the gas is inhaled from the outside. When the impeller continues to rotate, the corresponding space becomes smaller, and the original suction is made When the pressure reaches or slightly exceeds the gas pressure, the gas is discharged.

3. The working principle of reciprocating vacuum pump is: it uses the reciprocating motion of piston to pump air. This kind of pump has poor continuity and is relatively simple.

4. The principle of the steam jet pump is: the medium pressure steam of 8-12kg / cm2 is expanded through the heat insulation of the nozzle, the speed is increased to more than 1000m / s, the secondary steam and non condensable gas are sucked into the mixing chamber, after the secondary steam and non condensable gas are sucked and mixed with medium pressure steam, the speed is increased to about 200m / s, the medium pressure steam carrier inhales the steam into the diffuser, and the mixed steam is compressed and decompressed in the compressor After that, discharge the pump. The imported steam jet pump has high concentricity, good material and ingenious nozzle design. At present, the domestic steam jet production technology cannot be compared with the imported advanced steam jet.


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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.

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Common troubles of water ring vacuum pump

Water ring vacuum pump in use after a period of time there will be some failures, water ring vacuum pump common failures?

1、 Insufficient water ring vacuum pump

Possible causes: insufficient power supply of motor leads to insufficient speed; insufficient water supply; excessive 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.

Troubleshooting: check whether the power supply voltage is within the rated voltage range of the motor; increase the water supply (it must be controlled 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、 It can't be started or it's noisy

Possible causes: insufficient power supply voltage of the motor; lack of phase operation of the motor; corrosion of the water ring vacuum pump due to long-term failure; suction of debris in the pump; impeller drag distribution board.

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、 Motor overheating

Possible causes: motor overload due to excessive water supply; motor phase loss; exhaust hole blockage; impeller driving other components.

Troubleshooting: reduce the water supply to the normal range (refer to the pump's operating instructions for the liquid supply); check whether the wiring is firm; check the exhaust port; open the water ring vacuum pump cover to adjust the clearance between the impeller and other components.

4、 Insufficient flow

Possible causes: pipeline air leakage and liquid leakage; increase of resistance loss;

Troubleshooting: check the mechanical seal at the connection; check the pipeline and check valve for failure.

The above is the main reason for the common failure of water ring vacuum pump.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

How does the vacuum unit work?

The roots vacuum pump needed by roots vacuum unit can't directly exhaust the atmosphere. For example, the pressure difference between the suction port and the exhaust port of Roots vacuum pump will be too large, which will overload the roots vacuum pump. For example, simply increasing the motor power of Roots vacuum pump will form the overheating of roots vacuum pump, which will cause the tiny gap between the roots vacuum pump rotors to get stuck quickly due to thermal contraction.

In order to ensure that the roots vacuum pump can reach a higher vacuum, the gap between the rotors of Roots vacuum pump must be ensured. Therefore, the roots vacuum pump must be equipped with a front-end pump when it is used. When the pressure in the system is pumped to a certain range, the roots vacuum pump can be started again, so as to prevent the overload of Roots vacuum pump. The front stage pump can select water (liquid) ring vacuum pump, rotary vane vacuum pump, slide valve vacuum pump, reciprocating vacuum pump and other vacuum pumps that can directly exhaust the atmosphere.

In general, water ring pump is more advantageous than other vacuum pumps in Roots vacuum unit. This is mainly because it can pump a lot of condensable steam, especially when the mechanical vacuum pump of gas ballast oil seal can not remove condensable steam, or the solvent used can make the pump oil deteriorate and affect the performance, or when the vacuum system does not allow oil pollution, it is more obvious Obvious.

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