Configuration of high vacuum unit

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

The vacuum pump with high vacuum discharge can meet the requirements of vacuum pump on one side. Obviously, the simplest vacuum unit is a vacuum pump with direct discharge to the atmosphere. However, the high vacuum system generally needs three-stage units, and the medium vacuum system generally needs two-stage units.

It is difficult for a high vacuum pump and a low vacuum pump to form an effective high vacuum unit. There are several reasons for this. The continuity of traffic is one of them. High vacuum pump has the limitation of pressure resistance of the front stage, that is, if the former stage is higher than a certain pressure, the pump can not work normally. When the current stage pump reaches this critical pressure, the pumping speed will be reduced, so the exhaust flow of the front stage pump may be less than that of the main pump. The inconsistency of the flow rate destroys the requirement of flow continuity, which will inevitably cause the vacuum unit not to work normally. However, if a medium vacuum pump is connected between the high and low vacuum pumps, it can serve as a connecting link between the preceding and the following. The flow rate is continuous, and all pumps can work in the best state. Roots pump can work in the medium vacuum range, is the most suitable, so it is also known as roots booster pump, because its compression ratio is not high, just can connect a few PA to hundreds of PA range. When the three-stage high vacuum unit enters a higher vacuum degree, due to the obvious reduction of the exhaust flow of the main pump, the continuity of air extraction can be maintained only by a small front stage pump. In practical application, this method is often used, which can reduce the energy consumption of the unit.

Another reason why high vacuum units often need three-stage units is due to the limitation of suction pressure of high vacuum pump. All pumps have initial working pressure, and traditional high vacuum pumps are in the range of several PA. Therefore, the front stage pump must be pre pumped to this pressure before the main pump can start to work. However, it usually takes a long time for the front-stage pump to pump to this pressure, because the pumping speed of the pump decreases with the decrease of the pressure. Especially for the vacuum unit with periodic air pumping, the time required for reaching the working vacuum degree is required. The longer the pre pumping time is, the longer the time for entering the working vacuum degree is. Therefore, a medium vacuum pump is added to cooperate with the front stage low vacuum pump to realize the working vacuum degree It takes a short time to reach the working pressure of the main pump, so that the system can enter into the working pressure as soon as possible, thus ensuring the use efficiency of the equipment.

Rotary Vacuum Pump For Photoresist Removal

Water ring vacuum pump

Rotary Vane Vacuum Pump

Quality of Roots vacuum pump

The practical production of Roots vacuum pump is carried out through various processes. In order to strengthen the quality of the blank, the deep processing should be carried out strictly. The management system should be done in time to help the production of waste products. Under the condition of not affecting the order production, the waste parts should be treated well, and the man hour quota should be controlled well On the basis of the bottom operation, we should timely corresponding to the needs of the market, and strengthen the optimization of the processing technology of the products. 

The use of Roots vacuum pump strength has become an important condition to promote the development of enterprise productivity. Its use in different occupations has different application ability, but the same point is that it can not be used as a single pump, it can only be assembled with other equipment into unit products for use, playing a driving strength foundation. Through the use function of the equipment itself, it can be useful For the use of other equipment to achieve a higher functional strength, improve the driving effect of product application.

Under the premise of accelerating the development of Roots vacuum pump's useful effect, it is necessary to make continuous performance of product application and function, further enhance the improvement of its product superiority, let the application of its products drive the development of enterprise's productivity, promote the continuous improvement of its application function in all aspects, fully accelerate the driving of its product application ability, and make it continuously perform on the basis of rational use Show the outstanding performance of the product application effect, and then show the usable function of the equipment.

In order to improve the quality of Roots vacuum pump, it is necessary to combine the status of product application, improve the development of all application strength, and constantly complete the overall driving of product application ability, so that it can enhance the continuous improvement of its quality advantage under the advantage effect of reasonable use, and make it show internal use advantage in the development process.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Selection of vacuum system

Under its working pressure, the vacuum pump should be able to discharge all the gas in the process of vacuum equipment process, and recognize the vacuum volume of the system. Check the time required to acknowledge the required vacuum, the flow resistance and leakage of the vacuum pipe. Considering the requirement of vacuum degree, adhere to the pumping rate of vacuum demand under certain process requirements after reaching the required vacuum degree; correctly combine the vacuum pump and recognize the appropriate stage ratio between the main pump and the previous stage pump; when planning the vacuum pipeline, the short and thick pipeline should be selected as far as possible, and the general pipe diameter should not be less than the inlet of the true empty pump. 

In the planning of the vacuum system, the sealing performance of the system should be carried out to reduce the leakage rate of the system. Appropriate sealing data should be selected. The practical pumping volume flow of liquid ring vacuum pump is related to the working liquid. The higher the working fluid is, the higher the steam partial pressure is

The worse the condensing effect of the steam at the inlet of the pump is, the smaller the volume flow of the vacuum pump is. It is suggested to select the working fluid with low full vapor pressure. The temperature of the working fluid should be controlled together. As for the gas with high freezing point, such as glycerol, octamethylcyclotetrasiloxane and hexamethyltrisiloxane, etc., should be removed. In order to avoid these gases from entering roots pump and agglomerate and accumulate, it is necessary to move the temperature of roots pump, such as heating nitrogen; In the vacuum system planning, new skills should be selected to achieve active control and interlock protection.

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Influence of cooling system temperature on the performance of vacuum pump unit

 In summer, the temperature of closed water can reach 35 ℃. Therefore, it is difficult to guarantee the supercooling degree of 4.2 ℃ in the actual operation of vacuum pump. As the sealing water temperature approaches to saturation, its pumping capacity also decreases, until saturated vaporization and loss of working capacity. 

The working pressure of the vacuum pump and the pressure of the condenser is a dynamic balance process. No matter how high or low the circulating water temperature is, the suction pressure of the vacuum pump must be lower than that of the condenser in order to pump the non condensable gas from the condenser. Therefore, the sealing water temperature of vacuum pump must be lower than the saturation temperature corresponding to the exhaust pressure.

The situation of vacuum drop is that the sealing water in the vacuum pump is vaporized because the water in the gas water separator is not changed in time. A few days later, the test was carried out on vacuum pump a of No.2 unit. After adding 16 ℃ cold water into pump a, the temperature of separator was 16.2 ℃. After starting pump a, the temperature rose to 24.5 ℃. With the increase of temperature, the vacuum decreased. When the water temperature was 30 ℃, the vacuum increased about 1kPa and the current of vacuum pump increased about 0.85a. When the working water temperature drops by 1 ℃, the vacuum increases by about 0.19kpa. It can be seen from the test that it is an important means to ensure the vacuum of the vacuum unit to ensure the lower temperature of the sealing water of the vacuum pump in summer.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Characteristics of imported claw type dry vacuum pump

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

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

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

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

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

High temperature magnetic pump for mold temperature machine

High-temperature magnetic pump is a magnetic drive high-temperature pump specially designed for the mold temperature machine industry, which can reach a high temperature of 180°C to 360°C with high efficiency.

Features of high temperature magnetic pump:

(1) Since the drive shaft does not need to penetrate the pump casing, but uses the magnetic field to transmit torque through the air gap and the thin wall of the isolation sleeve to drive the inner rotor, thus fundamentally eliminating the leakage passage of the shaft seal and realizing a complete seal ,

(2) High requirements are used in the design of magnetic materials and magnetic circuits,

(3) The maintenance and repair workload of the magnetic pump is very small.

(4) The high temperature magnetic drive pump can only transport media without particles.

(5) Under normal and special use conditions, the high-temperature magnetic drive pump does not age and demagnetize over time.

(6) The high temperature magnetic drive pump should avoid dry running to avoid burning of the sliding bearing and isolating sleeve.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

How to select the type of pneumatic diaphragm pump

First of all, the plate filter press is driven by the flow of the pump. The flow is one of the important data for selecting the pump. The selection of the pump should be based on the processing capacity and processing period of the equipment. Secondly, according to the volume of the filter chamber of the plate and frame filter press, the moisture content of the sludge after dewatering, and the sludge concentration before entering the plate and frame, the amount of sludge required for each dewatering operation of the plate and frame is converted. Then, determine a reasonable mud feeding time, such as 2-3 hours. Calculate the flow rate.

Third, pneumatic diaphragm pump material: if it is common biological sludge, ordinary cast iron or aluminum alloy material is selected, which is more economical. Other special sludge, according to the specific sludge composition, choose pneumatic diaphragm pump material, such as engineering plastic, stainless steel 304 or 316L, fully lined fluoroplastic diaphragm pump.

Dry Screw Pump In Oil Field

Vacuum Pump Unit For Biodiesel Distillation Selection

Vacuum Pump Mechanical Seal 

Cleaning method of water ring vacuum pump cavity

The cleaning problem of water ring vacuum pump is an important aspect of water ring pump maintenance, because the water ring vacuum pump is used for a long time, it is inevitable to enter some dirty things in the pump cavity. With the increase of time, these dirt cover the inside of the pump cavity, which has a great adverse impact on the performance of the pump!

If you want to make the water ring vacuum pump use for a long time and keep its performance stable, the daily maintenance work is inevitable. Only by doing a good job of cleaning it can it work for us normally. The machine also needs to be taken care of, not only for the appearance of cleaning, but also for keeping the interior clean. Speaking of this, some may think that it is not enough to flush with water, in fact, only use it This method is not enough, because there may be scale or other substances in the vacuum pump which has been running for a long time. It is far from enough to use water only to clean the pump once.

How to clean the water ring vacuum pump correctly? Today I will teach you a simple and easy to learn method. Dilute nitric acid or other soluble substances, but do not use high purity ones, which will directly damage the internal components of the vacuum pump. Place it in the container for about an hour, and then wash it with water directly. If there is pressure, the effect will be achieved Will be better, such a cleaning step is not very simple, only regular maintenance of the pump, in order to extend its life.

Of course, cleaning the water ring vacuum pump is only one aspect. In daily maintenance, there are many components that need to be maintained by the user. For example, which part is seriously worn must be replaced, or it will directly affect the operation of the vacuum pump. If there is a problem in the pipeline, find out the cause of the leakage and repair it in time. All these works should be checked every day during the use As long as every detail is important, there will be big problems with the vacuum pump.

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Ultra High Vacuum Oil Diffusion Pump

diaphragm vacuum valve principle application range

Diaphragm vacuum valve uses the valve rod to press the rubber diaphragm directly on the valve seat. It is used to cut off or connect air flow. It is often installed between the pumped container and various low vacuum pumps. Its action principle is to rotate the handle to move the stem downward, press the rubber diaphragm directly on the valve seat, and cut off the air flow. Rotate the hand wheel in the opposite direction, and the valve rod moves upward to drive the rubber diaphragm away from the valve seat and connect the air flow.

The main body of the valve is made of aluminum alloy. Simple structure, light weight, small volume and good sealing performance. The diaphragm vacuum valve with NBR is used for the non corrosive gas on the low vacuum pipeline and the temperature of - 25 ~ 80 ℃. The diaphragm vacuum valve with fluororubber can be used for the high vacuum system with the temperature range of - 30 ~ 150 ℃

The existing series of diaphragm vacuum valves produced in China have nominal diameters of 10 mm, 25 mm, 40 mm and 50 mm respectively. Among them, GM type high vacuum diaphragm has five types: GM type, GMC type, gm-kf type, gm-d-h (I) and gm-d-h (II). The difference lies in the form of connecting flange of the valve.

SSR Roots Type Blowers

Dry Type Oilless Vacuum Pumps

Roots Vacuum Pump

water ring vacuum pump pumping speed

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

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

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

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

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

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

Dry Screw Vacuum Pump In Power Generation Plant

Water Ring Pump

Water Ring Vacuum Pump

What is the leakage rate of vacuum pump

What is the leakage rate of vacuum pump

It refers to the flow of a specific gas through the leakage hole under specified conditions.

The leakage rate of the vacuum pump is directly related to the ultimate pressure. In the vacuum pump operating at the ultimate pressure, its gas state is close to the molecular flow, the molecular free path of the gas is large, and the gas molecules are not easy to penetrate the gap between the rotor and the relevant parts, that is to say, the time gap has a very small impact on the ultimate pressure, and the only factor that can affect the ultimate pressure is the leakage rate 。 The so-called vacuum pump has reached the limit pressure, that is, the gas leaking into the vacuum pump and the gas pumped out by the vacuum pump have reached a dynamic balance and entered a relatively stable state.

There are two methods to measure the leakage rate of vacuum pump, valve method and helium mass spectrometer method.

Belts Driven Liquid Water Ring Vacuum Pump And Compressor

Water Ring Pump

Water Ring Vacuum Pump

Oil sealed vacuum pump in semiconductor industry

The oil seal vacuum pump is the rotary vane vacuum pump, which is generally the front stage vacuum pump of the vacuum unit. This kind of pump compresses various mixed gases into atmospheric pressure and discharges them into the exhaust pipe in the range of 60-100 ℃. If the pressure, concentration and temperature of hazardous products in the pump are relatively high, these substances will accumulate in the pump and its accessories, and these substances will contact with the surrounding air in the exhaust pipe, etc., which will constitute a potential danger.

For the harmful gases produced or used in semiconductor manufacturing, appropriate measurement methods must be adopted to prevent fire and explosion, ensure the normal operation of the equipment, and prevent the acute or chronic poisoning of operators, maintenance personnel and service personnel. For the sake of safety, suitable vacuum pumps and accessories with sufficient pumping force shall be equipped, and reasonable operation and maintenance methods shall be adopted, and appropriate monitoring devices shall be equipped.

Vacuum Pump Features

Water Ring Pump

Water Ring Vacuum Pump

Working principle of dry vacuum pump

Dry vacuum pump (also referred to as dry mechanical pump) refers to a mechanical vacuum pump that can start pumping from atmospheric pressure and directly discharge the pumped gas to the atmosphere. There is no oil or other working medium in the pump cavity, and the limit pressure of the pump is the same or close to that of the oil sealed vacuum pump.

The dry vacuum pump is a suction and exhaust equipment which uses a pair of screws to make synchronous and high-speed reverse rotation in the pump shell. The two screws are supported by bearings after fine dynamic balance correction and installed in the pump shell. There is a gap between the screws and the screws. Therefore, there is no friction between them during the operation of the pump. The operation is stable, the noise is low, and the working cavity does not need lubricating oil. Therefore, the The dry-type screw pump can pump out the gas containing a large amount of water vapor and a small amount of dust, with higher limit vacuum, lower power consumption, energy saving, maintenance free, etc. It is an updated product of oil seal / water ring / jet vacuum pump.

The scroll of oil-free scroll vacuum pump is a scroll like structure formed by one or several involute helices connected with a plane at one end. A pair of scroll plates, composed of a static scroll plate and a dynamic scroll plate, constitute the basic suction mechanism of a vortex oil-free vacuum. For example, in a two-stage scroll oil-free vacuum pump, there are two fixed vortices with corresponding directions, and one rotating one between the two vortices. The dynamic and static vortices move relative to each other to form a crescent shaped real cavity with constant volume change, which enables the air to be sucked in from the suction port and discharged from the exhaust port, thus completing the exhaust cycle.

The limit vacuum degree of dry screw vacuum pump, claw vacuum pump and oil-free scroll vacuum pump is very high, and the high limit vacuum can reach 1-2pa; the oil-free reciprocating vacuum pump is a coarse vacuum equipment, and the limit vacuum degree is low, so it needs to be combined with roots vacuum pump to improve the limit vacuum. Air extraction: due to internal structure problems, the oil-free scroll vacuum pump has small air extraction, which is only applicable to the process of small air extraction; the dry screw vacuum pump has complete models, which can be applied to the process of large air extraction, and can meet the needs of different customers with the help of roots vacuum pump. Stability: the dry screw vacuum pump has stable performance, low noise and low failure rate; the oil-free reciprocating vacuum pump has simple structure and high noise, which requires frequent replacement of slide. Due to the complex assembly of claw vacuum pump, the rotor and the shaft are not integrated. In case of failure, it is necessary to disassemble and assemble all the parts again and again, so as to reduce the product performance and stability.

Due to the flammable, explosive and corrosive gases in the process gas of chemical industry and pharmaceutical industry, the dry vacuum pump needs special treatment. The internal structure of dry screw vacuum pump is simple, two rotors and pump cavity can be treated with anti-corrosion treatment, and two kinds of coating, nickel phosphorus coating and Teflon coating, can be selected. It is difficult to do anti-corrosion treatment for claw vacuum pump, almost no surface treatment can be done between all stages of diaphragm, and the anti-corrosion coating on the rotor surface is easy to be damaged during assembly. The oil-free scroll vacuum pump is only suitable for pumping clean gas, and it can't pump inflammable, explosive and corrosive gas.

Vacuum Pump In Vacuum Freezing

Water Ring Pump

Water Ring Vacuum Pump

water ring vacuum pump characteristics and development

A new type of 2be series water ring vacuum pump is designed. The pump body of this kind of water ring vacuum pump is non cylindrical. This shape is suitable for the flow of gas and liquid, so it can significantly improve the performance.

Under the same conditions, the air volume of 2be water ring vacuum pump can be increased by 10% (when dry air is sucked in), or 20% (when wet air is sucked in), and the energy consumption is also small. Anti cavitation holes are designed in the pump to avoid cavitation. The 2be water ring vacuum pump has been successfully developed through a large number of experiments, rather than based on the theoretical research results. 2be water ring vacuum pump has been ordered since 1981.

Vacuum pump was first used in the heating system of New York, and then it was used in papermaking and other industrial sectors. After 1915, it was gradually widely used in industry.

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

industrial vacuum pumps,vacuum furnaces

Sealing of overflow valve of slide valve vacuum pump

The sealing degree of the exhaust valve directly affects the problem that the gas in the oil tank slightly higher than atmospheric pressure flows back to the pump cavity. If the valve is not closed tightly, it will seriously affect the vacuum degree of the vacuum pump. The main reason for the loose closing is that the valve plate is deformed, cracked, or the valve plate is not guided properly when it is bouncing, which causes the valve plate to stay.

If the exhaust valve is not closed in time, the vacuum degree of the pump will also be affected. For example, in order to reduce the power consumption and noise in high vacuum, when the composite exhaust valve combining the compression valve and the floating valve is used, the single-stage pump will not have problems generally. When the double-stage pump is used, because the pressure difference between the low true cavity and the oil tank is relatively small, especially when the rotating speed is high, the floating valve will not appear The phenomenon of timely closing affects the vacuum degree of the slide valve vacuum pump. If floating valve is used in the overflow valve of high true cavity of two-stage pump, the problem will be more prominent because the pressure difference between two sides is smaller.

The spring force of exhaust valve can be smaller on the premise of ensuring the valve tightness. If the pressing force is too large, the power consumption will be increased. In the past, the compression force of some imitated pump springs was up to 1.2x105pa. Through our repeated tests, it was found that 1.02 ~ 1.1x105pa was suitable, which not only reduced the power consumption, but also reduced the noise.

Piston Vacuum Pump In Coal Tar Distillation

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

Control of liquid seal in water ring of vacuum pump

The vacuum pumping of vacuum pump mainly depends on the water ring liquid seal in the pump body. The level of water ring liquid seal determines the pumping rate and vacuum degree of the pump. In the early stage, the liquid seal of water ring is of direct discharge mode, which has problems in process control, economic operation and environmental protection.

① In order to prevent scaling of equipment and pipelines, industrial water shall not be used during the suction of C02 gas. In addition, some enterprises have acid corrosion and Cl corrosion in their vacuum pump operation system, so the pump body is lined with stainless steel and desalted water is used in selection.


② In addition, the maximum working fluid volume of 12 vacuum pumps is 155m3 / h when they are operating at the same time. Considering economic operation and environmental protection, the working fluid must be recycled. How to ensure the circulation and control of working fluid? Through demonstration, a feasible scheme is finally determined, that is, four vacuum pumps are used for the first time to share one gas-water separator. By adjusting the liquid level of the gas-water separator, the water ring liquid seal level of the vacuum pump is controlled, and the effect is good after being put into use.

As a physical adsorption decarbonization process, PSA has obvious energy saving and emission reduction effect, but it also has the problem of effective gas yield. How to ensure a more optimized yield and a more stable process operation needs to be summarized, improved, optimized and improved in the future production operation to create better economic benefits for enterprises.

What is water ring vacuum pump

Liquid Ring Vacuum Pump


liquid ring comprssor

Common types of vacuum pumps in vacuum distillation

Common types of vacuum pumps in vacuum distillation

For the refining process of liquid products, the last step is often distillation. The main purposes are: to maintain the physical and chemical properties of the product; the refining yield of the product is as high as possible; taking the product as the positive fraction, to remove the low boiling part as the solvent and the high boiling part of the waste material, so as to achieve the product quality index. Liquid products usually have the heat sensitivity of thermal deterioration, so it is very important to achieve refining at a lower temperature.

Similarly, from the consideration of economy and environmental protection, the removed solvent must be recycled. The refining of liquid products is required to be carried out under high vacuum as much as possible, and the normal operating pressure is below 10Pa (one standard atmospheric pressure is 101325pa). There are two kinds of single pumps, slide valve vacuum pump and claw pump, and roots vacuum unit.

(1) Roots vacuum unit.

Its operating power is quite high. For the unit with the same pumping capacity of the front stage pump as the lh-70ph claw pump, the unit power is 20kW. For the vacuum generating device running continuously day and night, the difference of 12.5KW means the difference of electricity cost of 90000 yuan (calculated by 300 working days and nights every year) after one year. 1 yuan / kWh).

(2) Spool pump.

It must have a vacuum pump to work effectively. When the gas flows through the vacuum pump, it is inevitable that the vacuum pump oil will be entrained out. This means that the recovered solvent cannot be applied directly, or the environment can be wasted and polluted. In addition, the slide valve pump requires high operation and maintenance. In the cold season, if the switch is a little careless, it is very easy to damage.

(3) Claw pump.

Using claw pump, there is no problem in recovering solvent under normal pressure after pump. In addition, due to its good structure, excellent processing and complete accessories, once put into use, it has low requirements, wide range of use, long service life and convenient cleaning and maintenance. When a higher vacuum is needed, it can be used as a front stage pump to form a vacuum unit conveniently.

It can be seen that in the case of high vacuum refining of liquid products, claw pump is a quite reasonable option.


Professional Liquid Ring Vacuum Pump Manufacturer

Liquid Ring Vacuum Pump And Pump Set

Water Ring Pump

Vacuum pump in lithium bromide hot and cold water unit

Vacuum pump in lithium bromide hot and cold water unit

1. Strong drainage steam capacity

Due to the special working conditions of lithium bromide hot and cold water units, the vacuum pump must have a high drainage steam capacity. Our 2XZ rotary vane vacuum pump has a high pump temperature and a complete gas ballast device, which makes the pump have a higher drainage steam capacity. .

2.Reliable anti-return oil safety valve

This valve plays a vital role for this pump. Direct-connected pumps from other domestic manufacturers (even Japan) do not have this device. In order to prevent oil return, an additional electromagnetic bleed-off valve is required. Since the valve plate is directly pulled by the electromagnetic force against the spring force, the current is large and the reliability is poor.

3. Easy maintenance

The high and low vacuum stages of the vacuum pump can be separated separately, positioned by positioning pins, and can be easily disassembled, cleaned and cleaned according to the instructions of the manual. In addition, we have also made some adjustments to this vacuum pump based on the application of lithium bromide refrigeration for two years to make it more suitable for this application.

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Vacuum Pump For Sealing Materials Requirements

Vacuum Pump Use Details

Research and Improvement of Rotor Blade Vacuum Pump Stator Profile

Research and Improvement of Rotor Blade Vacuum Pump Stator Profile

Rotary vane vacuum pump is a kind of small volume, light weight, low noise, convenient starting, low cost among many vacuum equipment. It can be used alone or in combination with other vacuum equipment. It is used as the foreline pump of the Roots rotary vane vacuum unit. It is widely used in laboratories, metallurgy, machinery, printing, electronics, chemicals, light industry, petroleum and medicine field.

The traditional rotary vane vacuum pump eccentrically places a rotor in the circular stator cavity. When the rotor rotates, due to the eccentric action, the rotary vane on the rotor slides against the inner curved surface of the stator under the action of centrifugal and spring forces to achieve volume change. Complete the suction and exhaust process. This causes greater friction and abrasion between the rotary vane and the pump cavity, which causes the temperature of the high-speed rotary vane pump to increase, which reduces the mechanical efficiency and working life of the rotary vane pump.

Aiming at the above disadvantages of the traditional rotary vane vacuum pump, a new type of rotary vane vacuum pump with a stator profile is proposed. The traditional rotary vane and spring structure is replaced with a through rotor. The entire rotor is placed in the rotor slot above the rotor, and both ends of the rotor contact the inner surface of the stator at the same time. When the rotor rotates, the rotating blade is driven to move, and both ends of the rotating blade always slide along the inner wall of the stator. Since the movement of the rotor is always constrained by the inner wall of the stator, the stator internal profile (also known as the pump cavity profile, hereinafter referred to as the stator profile) is a profile generated based on the rotor's movement mechanism.

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Vacuum System In Fertilizer Manufacturing

What kinds of vacuum pumps are there in the vacuum system?

What kinds of vacuum pumps are there in the vacuum system?

Vacuum system is composed of vacuum chamber, vacuum pump or vacuum unit, vacuum pipeline, vacuum valve, trap and other vacuum components, electrical control system, etc. it is widely used in electronic semiconductor industry, photoelectric backlight module, mechanical processing and other industries. Vacuum system is often composed of several vacuum pumps, which play a role in different fields according to their characteristics.

1. Main pump

The main pump is used to obtain the required vacuum degree to meet the specific process requirements of the vacuum pump. According to the different limit pressure required by the vacuum system, the limit pressure of the main pump in the selection process is generally half to an order of magnitude lower than the limit pressure required by the system.

2. Crude pump

Crude pumping pump is a vacuum pump that starts pumping at atmospheric pressure and reduces the pressure of the pumped system to that of the main pump system.

The pressure reached by the crude pump must be less than the starting working pressure of the main pump. The crude pump can also be used as a pre-stage pump.

3. Front pump

The former stage pump is a vacuum pump which maintains the pressure of the former stage of a pump lower than the critical pressure of the former stage. The pre pump can also be used as a crude pump, but it must meet the requirements of pre pumping time and vacuum degree.

At the same time, the pre vacuum condition required for the operation of the main pump shall be met by the pre stage pump; under the maximum allowable exhaust pressure of the main pump, the pre stage pump must discharge the maximum amount of gas discharged by the main pump in time, and the pumping speed of the pre stage pump shall be in accordance with the actual pumping speed of the pump at the actual inlet pressure.

4. Maintenance pump

Maintenance pump means that when the air volume in the vacuum system is very small, it can not effectively use the previous pump. Therefore, an auxiliary pump with a smaller pumping speed is equipped in the vacuum system to maintain the normal operation of the main pump or the low pressure vacuum pump required by the evacuated system.

How To Select Vacuum Pump In Chemical Industry

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers