Pollution prevention of vacuum pump unit

Different vacuum systems require different degrees of vacuum. Therefore, under different operating conditions, it is often necessary to use a set of vacuum units to complete the operation, that is, the vacuum pumps working in different pressure ranges are connected in series. Such as vacuum transportation, vacuum impregnation, vacuum filtration, vacuum monotony, vacuum degassing (liquid steel treatment) and other processes need to use low vacuum pump unit with high working pressure and large displacement. Reciprocating vacuum pump, oil sealed vacuum pump, steam radiation pump, water ring pump and roots pump are commonly used in this kind of low vacuum pumping unit. 

In addition, the application of vacuum pump unit also needs to be equipped with dust remover, monotone tank and other components according to the actual working environment gas cleanliness, humidity or other special environmental conditions.

Due to the complex working environment of vacuum pump unit, after long-term operation, the vacuum degree can not be pumped up, or the vacuum degree can not reach the original limit vacuum level and other faults. This is related to the oil vapor pollution of the vacuum chamber wall and the pollution of various pollutants in the vacuum process.

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vacuum pumps

Detailed introduction of magnetic pump

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

Magnetic pump is a kind of leakage free fluid conveying machinery without dynamic seal. The centrifugal pump in vane pump is mainly designed. It is usually composed of pump body, isolation sleeve and connecting parts, which can bear the pressure. There is a rotating permanent magnetic field outside the sealing cavity, and through the action of the magnetic field, the magnetic rotor parts inside the sealing cavity rotate synchronously, and the rotor parts inside the sealing cavity 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 pass through the shielding seal cavity, thus ensuring zero leakage and no pollution of the magnetic pump.

Magnetic drive pump (hereinafter referred to as magnetic pump) is usually composed of electric motor, strong coupling device and centrifugal pump. Its main feature is that the magnetic coupling device is used to transfer power. When the motor drives the external magnetic rotor of the magnetic coupling device to rotate, the magnetic line of force passes through the gap and isolation sleeve, acting on the inner magnetic rotor, so that the pump rotor and the motor rotate synchronously, and the torque is transmitted without mechanical contact Because the liquid is enclosed in a static isolation sleeve, there is no dynamic seal, so there is no leakage.

CL Sereis Cone Liquid Ring Vacuum Pump

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Roots Vacuum Pump

Screw vacuum pump in metal smelting

As we all know, in the metallurgical industry, high vacuum smelting is widely used for production or processing, especially in some high-end fields, the requirements of impurity content, oxygen, nitrogen and even hydrogen content of products are extremely strict, so high standards and requirements of vacuum system are required.

For example, vacuum distillation (the more advanced vacuum unit composed of dry screw vacuum pump and roots vacuum pump): in the distillation tank with vacuum degree higher than 1.3 PA, the reduction product is heated at 900-950 ° for a long time, and magnesium and magnesium chloride can volatilize and condense on the condenser.

This is mainly because of the following points:

1: It can greatly reduce the boiling point of the reduced product and make it easier to volatilize.

2: It can greatly increase the volatilization rate. The volatilization rates of different substances vary greatly under different vacuum degrees.

3: Prevent the production of Ti-Fe alloy or other compounds from affecting the product quality.

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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.

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Roots Vacuum Pump

Classification of mechanical pumps commonly used in laboratory

The commonly used mechanical pump in laboratory is rotary vane vacuum pump, also known as rotary vane pump. It is composed of a stator and an eccentric rotor, mainly composed of stator, vane and rotor.

The rotor is eccentrically installed in the stator cylinder, and two blades are tightly embedded in the rotor slot. Under the spring force, it is close to the stator cylinder wall, and the air inlet and exhaust port on the stator are separated into two parts. When the rotor rotates, the space of the air inlet will be gradually expanded to absorb gas, while the space of the exhaust part will be gradually reduced, and the inhaled gas will be compressed and discharged from the exhaust port, so as to achieve the purpose of vacuumizing. The vacuum pump oil is used as sealing fluid and lubricant in the vacuum pump oil with very small saturated vapor pressure.

2xz-2 rotary vane vacuum pump is commonly used in laboratory, "2XZ" refers to double-stage direct coupled pump, "X" refers to rotary vane vacuum pump, and data after "2XZ" represents pumping rate (L / s). The two-stage pump is composed of two chambers in series. Obviously, the limit vacuum of the two-stage direct coupled pump is better than that of the single-stage pump, which can reach a vacuum degree of about 10-1pa.

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Shanghai water ring vacuum pump characteristics

Water ring vacuum pump can transport both gas and liquid. It is only in the pumping liquid, the aging rate is low. When conveying gas, it can also be used as a low-pressure compressor, and its discharge pressure is about 0.1-0.2 MPa. The range of displacement is 0.25-30 m3 / min. The vacuum degree can reach 70-80%, while the vacuum degree can reach 99.5% when the manufacturing is excellent.

When the extracted gas should not contact with water, the pump can be filled with oil or other liquid medium (at this time, it is often called liquid ring pump). If oil is used as working medium, the vacuum degree of the first stage and the second stage can reach 99.98% and 99.999% respectively.

The biggest advantage of water ring vacuum pump is that it can pump gas containing liquid. In the use of the vacuum system, there are many conditions in which the inhalation contains liquid in the form of clouds. Even if it contains Yanqi state, it will liquefy in the compression process, and it is not suitable to use general reciprocating pump for such suction. Because the liquid is enclosed between the piston and the cylinder head, the valve and other channels become too narrow due to the existence of liquid. The gas resistance increases, that is, the success rate is lost. And the water ring vacuum pump is originally liquid as the piston, so in the suction containing liquid is completely OK.

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Notes on the use of reciprocating vacuum compressor

Notes on the use of reciprocating vacuum compressor

① Always pay attention to the change of gas pressure and temperature at all levels, whether the temperature of lubricating oil and bearing exceeds the allowable value, and the change of current and cooling water temperature.

② Switch the oil filter regularly, check and analyze the quality of lubricating oil frequently, and replace the oil if it does not meet the specified requirements.

③ Always keep the parts complete and in good condition, and keep the body clean and sanitary.

④ Carry out scheduled maintenance on time and implement the maintenance system carefully.

⑤ Check the efficiency of oil separator and cooler regularly. If the efficiency is reduced, check and repair it.

⑥ The standby compressor shall be kept in full swing. When it is out of service for a long time, it shall be driven once a half month and run for half an hour.

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Two requirements for selecting water ring vacuum pump

What should be paid attention to when selecting the imported water ring vacuum pump. The type of imported water ring vacuum pump is mainly determined by the air volume, vacuum degree or exhaust pressure required for operation. When the pump works, the following two aspects should be paid attention to:

1. As far as possible, it is required to operate in the high efficiency area, that is, in the area of critical vacuum degree or critical exhaust pressure.

2. Operation near the maximum vacuum or exhaust pressure shall be avoided. In this area, not only the efficiency is very low, but also the work is very unstable, easy to produce vibration and noise. For the imported vacuum pump with high vacuum degree, cavitation often occurs when it operates in this area. The obvious sign of this phenomenon is that there is noise and vibration in the pump. Cavitation will cause damage to pump body, impeller and other parts, so that the pump can not work.

According to the above principles, when the vacuum degree or gas pressure required by the pump is not high, it can be selected in the single-stage pump preferentially. If the vacuum degree or exhaust pressure is high, the single-stage pump is often unable to meet the requirements, or the pump is required to have a large amount of air under a high vacuum degree, that is, the performance curve is required to be relatively flat under a high vacuum degree, so the two-stage pump can be selected. If the vacuum degree is required to be more than - 710mmhg, water ring atmospheric pump or water ring roots vacuum unit can be selected as the vacuum pumping device.

If it is only used for imported vacuum pump, it is better to choose single acting pump. Because the structure of single acting pump is simple, easy to manufacture and maintain, and it has good cavitation resistance under high vacuum. If it is only used for compressor with larger air volume, it is suitable to select double acting pump. Because of the large air volume, small volume and light weight of the double acting pump, the radial force can be automatically balanced, the shaft is not easy to produce fatigue fracture, and the service life of the pump is long.

Water Ring Vacuum Pump

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Dry Type Oilless Vacuum Pumps

Chemical pumps will help chemical production

A chemical pump is a machine that pressurizes and transports fluids. It changes the mechanical energy or other energy of the prime mover into liquid energy

In the chemical plant system, pumps are often used to transport, pressurize or return liquid materials such as raw materials, intermediate products and products. Therefore, pumps must have the characteristics of long-term, reliable, continuous and stable operation, high efficiency and low cost.

In the chemical industry, due to the different chemical production categories and process, the liquid delivered by the pump is very different. The corrosive range of these fluids ranges from non corrosive to strongly corrosive, such as hydrofluoric acid, concentrated alkali liquid, etc.; the viscosity range is from the liquid as thin as water to the high viscosity liquid of more than 100000 centipoises in the thick rubber industry, as well as the liquid containing suspended solids; there are non-toxic or highly toxic, highly volatile, flammable and explosive liquids; The temperature ranges from liquid hydrogen below the gas liquefying point of - 253 to thermal medium with a temperature of up to about 500, so there are many types of pumps.

Strictly speaking, chemical pump refers to the pump used to transport all kinds of liquid in the chemical process and the pump used to transport all kinds of chemical process liquid outside the process. In fact, the pumps used to transport industrial water and cooling water are not different from the pumps. Their main difference is that the chemical pumps often use special materials and designs to prevent corrosion and adapt to the characteristics of the chemical process.

Compared with water pumps, chemical pumps are much more complex in structure, shaft seal and pump materials. The technical difficulties and maintenance requirements of maintenance are much higher than those of ordinary pumps.

The normal operation of the pump is the key to ensure production. If the pump fails, it will affect production, or even cause half or full shutdown. Therefore, the maintenance and repair of the pump plays an extremely important role in the chemical production process.

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What is the configuration of water ring vacuum pump

Water ring vacuum pump is one of the vacuum pumps. In fact, water ring pump was used as a self-priming pump before, but with the continuous research and improvement of people, its application has been very extensive. So what is the general configuration of water ring vacuum pump?

Water ring vacuum pump is mainly composed of impeller, pump body, suction and exhaust disc, water ring formed by water on the inner wall of pump body, suction port, exhaust port, auxiliary exhaust valve, etc. Because of such high-quality configuration, the pump can be widely used in many industrial processes, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture return and vacuum degassing.

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Roots Vacuum Pump

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Advantages of vacuum pump planning

Vacuum pump is a kind of positive displacement pump. The size of the pump body determines the concave convex power of vacuum pump. At present, the round pump body is widely used in vacuum pump at home and abroad. The advantage of such planning lies in the convenience of processing and installation; therefore, the power of vacuum pump is not high. The main reason is that the impeller of vacuum pump needs more centrifugal force to make the sealing liquid separate the inlet and exhaust of vacuum pump.

The sealing liquid in the vacuum pump can transfer energy and seal effect in the vacuum pump, but the vacuum pump can only reach the planned volume as far as possible because of the structural constraints in the suction and discharge cavity, while the traditional vacuum pump body is the welding pump body, with smooth steel plate surface, and the straight impact of the sealing liquid on the smooth surface will show a straight-line repeated turn back, and then secondary noise will occur, which is smooth The surface of the vacuum pump has no ability to absorb noise.

Low noise vacuum pump features: compact structure, small floor area. Because the gas is compressed in the pump, the power consumption is low. Because there is no oil in the vacuum chamber, the dust will not stay in the pump chamber, but will be discharged out of the pump with the gas from the exhaust port. Moreover, it can deal with the problems of oil emulsification, frequent replacement of working fluid, frequent protection and maintenance, and save the use cost.

Piston Vacuum Pump

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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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Construction of mechanical vacuum pump

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

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

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

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Water Ring Pump

Water Ring Vacuum Pump

Vacuum pumps in the industrial sector

Vacuum pumps in the industrial sector

Vacuum pumps are widely used in industrial sectors, such as light bulb manufacturing, electronic tubes, food packaging, and semiconductor device manufacturing. Vacuum distillation, vacuum impregnation, ion nitriding, vacuum drying, vacuum carburizing, vacuum quenching, vacuum casting, etc. Under vacuum conditions, due to the small number of gas molecules, the harmful effects of gas can be avoided.

For example, heat treatment in vacuum can prevent oxidation and gas from penetrating into the metallographic structure, thereby improving the quality of parts; maintaining high vacuum in electronic devices can avoid the impact of electronic movement; maintaining high vacuum in vacuum packaging can improve the shelf life of food. In modern cutting-edge science and technology, vacuum technology is an indispensable means, such as high-energy accelerators, controlled thermonuclear reactions, universe simulation and other projects all require high vacuum or ultra-high vacuum technology.

There are many types of vacuum pumps, including mechanical vacuum pumps (such as reciprocating vacuum pumps, oil-sealed mechanical vacuum pumps, roots vacuum pumps, turbo molecular pumps, water ring vacuum pumps, etc.), jet vacuum pumps (such as water vapor jet pumps, water jet pumps, atmospheric jet pumps, Oil booster pumps, oil diffusion pumps, etc.), as well as physicochemical adsorption pumps (such as titanium pumps, molecular sieve adsorption pumps, cryogenic pumps, etc.). Mechanical vacuum pumps are mainly used in the machinery industry sector, and other types of pumps are less commonly used.


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Vacuum pumps in the chemical industry

Vacuum pumps in the chemical industry

In petroleum and chemical production, certain production processes are often carried out under atmospheric pressure. Any pressure lower than atmospheric pressure is called vacuum, and the degree of vacuum commonly used indicates the degree of lower than atmospheric pressure. The machine used to pump gas from equipment below atmospheric pressure is called a vacuum pump. Vacuum pumps are used in the petroleum industry for vacuum distillation, degreasing of lubricants, furfural recovery, etc. In the chemical industry, vacuum pumps are used for vacuum filtration, evaporation, concentration, drying, and crystallization of solutions. Vacuum pumps can also be used as large centrifugal pumps for drainage irrigation pumps.

Mechanical vacuum pumps can be classified into reciprocating type, rotary type (skateboard type), and water ring type according to their structural types.

Any vacuum pump generally uses the following two main parameters to indicate its working performance

(1) Air extraction rate refers to the volume of gas that the vacuum pump draws from the intake pipe under the residual pressure per unit time, that is, the production capacity of the vacuum pump (or called the worldly V), expressed in m³ or L / s.

(2) Residual pressure or ultimate vacuum refers to the lowest pressure (absolute) that the pump can reach.

A certain vacuum pump is used to suck the gas in a closed container. No matter how long the suction time is, the pressure in the container cannot be reduced to zero (that is, absolute vacuum) indefinitely. This is because when the inlet pressure is lower than a certain value, either because the liquid in the pump vaporizes, or because the air disc leaked from the high-pressure side is the same as the vacuum pump's pumping victory. , The volume coefficient is reduced to zero. Both will make the pump unable to continue to inhale fresh gas. In this case, the pressure in the container will never decrease again. The absolute pressure at this time is called the residual pressure or the ultimate vacuum.

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Water Ring Vacuum Pump

Influence of water temperature on water ring vacuum pump

Influence of water temperature on water ring vacuum pump

Water ring vacuum pump is a type of vacuum pump that we can often use. We all know that its service performance is very good, but it does not rule out accidents. After a period of use, it is easy to have some unexpected problems. There are many factors that affect the normal operation of the vacuum pump, so the water temperature is one of them, whether the water temperature is too high or too low, it will have a certain impact on the operation of the vacuum pump. So, why on earth is this? Now let's have a detailed understanding of the reasons.

1. Too high water temperature will make the water evaporate, and the negative pressure condition will further aggravate the occurrence of this kind of vaporization and evaporation, making the pump body produce too much water vapor. In this way, when the water ring vacuum pump inhales too much water vapor, but seldom inhales outside, resulting in a very low vacuum degree of the system. There are two main reasons for the high water temperature, one is that the water supply temperature is too high, the other is that the water temperature rises in the working process.

2. Because the water temperature is related to the suction capacity, the working fluid temperature is high, and the air volume will decrease. With the increase of temperature, the evaporation capacity increases, occupying the original displacement, and the suction capacity decreases, which will prolong the vacuumizing time. In addition, under the vacuum condition, the evaporation capacity of the sealing liquid will increase with the increase of temperature, and the larger the percentage of the displacement, the situation that cannot be vacuumized will occur. As for the data involved too much, the evaporation capacity of sealing liquid under various vacuum degrees and the evaporation capacity under various temperatures are not the same, so it is impossible to give specific data. Only under certain vacuum degrees can the temperature change be reflected and the evaporation capacity change be caused. In use, it must be combined with temperature, and the superposition of two performance curves of vacuum degree and pump performance curve can be seen.

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water ring vacuum pump characteristic curve

water ring vacuum pump characteristic curve

For different types of water ring vacuum pumps, the suction volume flow curve is related to the suction volume cavity and the size of the suction port: when the suction port is small and the suction volume cavity is relatively large, the suction volume flow will increase with the suction pressure increasing; when the suction volume cavity is relatively small, the suction volume flow will fill the whole cavity with the suction pressure increasing and the suction volume flow increasing to a certain value When the suction pressure is increased, the suction volume flow will remain the same. 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 system details

Vacuum system details

Many places can't do without the use of vacuum pump unit, but in use, some places are easy to be ignored. In order to prevent unnecessary losses to users during use, we need to understand: where is easy to be ignored when using vacuum pump unit?

Generally, the head of the vacuum pump is very high. For the centrifugal water ring vacuum pump, after determining the model, the power consumption is proportional to the actual flow of the pump. The flow will also decrease with the increase of the head, such as high head, small flow and small power consumption.

In order to prevent motor overload, vacuum pump unit will require the actual pumping head of vacuum pump, which can not be 60% lower than the calibrated head. Therefore, when the high head is used to pump water with too low head, the motor capacity overload will heat up, and in serious cases, the motor will burn down. In case of emergency use, a gate valve shall be connected to the water outlet pipe to regulate the water output, so as to reduce the flow and prevent the motor overload.

It should be noted that if the motor heats up and the motor is too hot, it is necessary to turn off the water outlet flow or shut down in time. Many people will misunderstand this. Some operators will think that blocking the water outlet and forcibly reducing its flow can increase the motor load. This is not the case at all. Therefore, when using the vacuum pump unit, the problem of motor temperature rise should be solved in time.

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circulating water vacuum pump application

circulating water vacuum pump application

The circulating water multi-purpose vacuum pump series take the circulating water as the working fluid, uses the fluid jet to produce the negative pressure to carry on the jet vacuum pump, has become the domestic most favored circulating water multi-purpose vacuum pump indisputably. It provides vacuum conditions for evaporation, distillation, crystallization, drying, sublimation, filtration decompression, degassing and other processes, especially suitable for laboratories and small tests in Colleges and universities, scientific research institutes, chemical industry, medicine, biochemistry, food, pesticide, agricultural engineering, bioengineering and other industries.

Features of circulating water vacuum pump:

1. Recycle water to save valuable water resources.

2. Save more than 35% power than other types of vacuum pump.

3. Special fluid muffler to reduce gas in water.

4. Double tap, double meter display, can be used alone or in parallel.

5. Resistant to acid, alkali and solvent corrosion.

6. The special motor is produced by a well-known motor manufacturer with fluororubber seal, and there is no corrosive gas intrusion inside the motor.

7. The water in the water tank shall be replaced regularly to ensure the purity of water quality, vacuum degree and avoid scaling.

8. It can be used to extract corrosive gas and shorten the water change cycle.

9. The pump body is made of PP material, and the jet device and suction nozzle are made of stainless steel, more suitable for acid gas.

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Influence of particulate matter on water ring vacuum unit and its solution

During the operation of water ring vacuum unit, some users reported that the gap was increased and the leakage was also large. This is because the pumped material contains a large number of solid particles. With the friction between the solid particles and the pump body, it will greatly affect the service life and cause various problems.

If the pumped gas contains solid particles, some of the particles will be discharged out of the pump with the gas, and some of the particles will continue to rub in the gap of the pump, resulting in the increase of the gap, resulting in the increase of the leakage, and the decrease of the vacuum degree and air volume. Therefore, the water ring vacuum unit is not suitable for pumping the gas containing a large number of solid particles, especially the solid particles with larger particle size and higher hardness.

Solutions when it is necessary to pump gas containing particles:

If it is unavoidable, the gas can be purified before entering the water ring vacuum unit (such as setting filter screen or adding vacuum buffer tank). If purification is difficult, the particles in the unit shall be washed clean after pumping.

Before using the water ring vacuum unit, confirm the use environment and the materials to be pumped, so that the corresponding treatment measures can be taken in advance to avoid the damage to the equipment caused by solid particles and other materials.

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