micro vacuum pump exhaust condition

If the micro pump can not pump water to the equipment effectively, it will need to be used in the process of low water pumping. 

The advantage of the micro vacuum pump in the process of using is that the equipment directly vacuumizes when it does not contact with water. After the vacuum is formed in the equipment, it needs to rely on the air pressure to pump up the water pressure, and then it starts to pump water. In the process of using, it may directly vacuumize because there is no water in the pump. After the vacuum is formed, it depends on the air pressure to pump up the water pressure, and then it is turned on Start pumping.

Micro vacuum pump in the process of pumping resistance, and then according to its judgment conditions to narrow the scope of selection, but in the process of using, we need to consider the problem of the exhaust end of the equipment in time, so as to better select the scope of its choice.

In the actual application process of micro vacuum pump, the exhaust condition faced by the equipment is different. One is that the exhaust is relatively smooth and directly to the atmosphere. The other is that the exhaust resistance is relatively large, such as valves, large damping sensors and other parts on the exhaust pipeline.

In the process of design and manufacture of modern micro vacuum pump, different exhaust conditions need to be treated differently. The exhaust port of the equipment allows a large resistance value. Such a parameter is to calibrate the exhaust capacity of the pump. In this way, strict technical means can be used to determine its type selection.

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Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

What are the principles of rotary vane vacuum pump

The rotary vane vacuum pump is a series connection of the main pump and the former stage pump. The rotary vane vacuum pump selects the rotary vane pump as the front stage pump, so it overcomes the defect of low pumping rate of rotary vane vacuum pump under certain pressure when it is in use, and retains the advantages of roots pump, such as agile operation and relatively large pumping rate.

Because of its compact structure and small floor area, rotary vane vacuum pump can replace multiple mechanical vacuum pumps. Therefore, rotary vane vacuum pump units are widely used in vacuum training, power capacitor, transformer vacuum heat treatment, vacuum coating equipment pre pumping, electric vacuum semiconductors and other occupations, which will not react with pump oil and contain no particulate dust.

Next, I'd like to introduce you to the following introduction, and maybe you can make a profit from it. How does the rotary vane vacuum pump work? Let's learn about it. When the rotary vane vacuum pump in the laboratory is lower than the full steam pressure under the pump temperature, it can be filled with gas and discharged from the pump at any time to avoid condensation in the pump oil. In addition, when the closed pump mouth is working.

The condensate of condensable gas that has been mixed into the oil may be dissolved in the oil in the gas phase, which will overflow from the pump cavity. At this time, if the mission of opening the gas town, a certain amount of condensable substances can be pumped out, and then play a certain pollution effect, extending the operation period of the pump oil.

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Operation characteristics of oil-free vacuum pump

The oil-free vacuum pump is the operation cavity of the pump, there is no medium to recover the original gas. There are many other categories of products that are loved by many professions. In the purchase of oil-free vacuum pump time must not be greedy cheap to choose a low price, but should be on-site investigation, to choose a suitable for their own. 

The working principle of oil-free vacuum pump is the same as that of general positive displacement pump. It is composed of stator, rotor, rotating plate, cylinder block, motor and other primary parts. When the rotor rotates at high speed, the four radial sliding blades in the rotor slot will divide the pump chamber into four operating rooms, because of the centrifugal force effect, the vane is close to the cylinder wall.

Separate the inlet and outlet of the stator, operate in a circular manner, change the volume, discharge the inhaled gas from the exhaust port, and then reach the purpose of air extraction. How does the oil vapor discharged from the oil-free vacuum pump affect the environment. If the environment does not allow pollution, can choose oil-free oil-free vacuum pump, perhaps the oil vapor discharged to the outdoor. Correctly combine the oil-free vacuum pump.

Because the oil-free vacuum pump has selective pumping, sometimes one kind of pump can not meet the pumping requirements, and several pumps should be combined to make up for each other to meet the pumping requirements. If the titanium pump has a high pumping speed for hydrogen, but can not pump helium, and the tripolar sputtering ion pump (or bipolar asymmetric cathode sputtering ion pump) has a certain pumping speed for argon, the combination of the two will make the vacuum equipment get better vacuum degree.

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Pressure of stainless steel vacuum pump

For the knowledge of stainless steel vacuum pump, I believe you have a certain understanding, in order to have a better use of it, we should understand its calculation method, the following is a brief introduction for you. 

Vacuum degree = atmospheric pressure absolute pressure (atmospheric pressure is generally 101325pa, the ultimate absolute pressure of water ring vacuum pump is 3300pa, and the limit absolute pressure of vane vacuum pump is about 10Pa)

1. Limit relative pressure: the relative pressure is how much lower the measured internal pressure is than the "atmospheric pressure". It shows that the actual value of system pressure is lower than that of atmospheric pressure. As the air inside the container is pumped, the pressure inside is always lower than that outside the container. Therefore, when expressed in terms of relative pressure or gauge pressure, the value must be preceded by a negative sign, indicating that the internal pressure of the container is lower than the external pressure;

2. Limit absolute pressure: the absolute pressure is how much higher the measured internal pressure is than the "theoretical vacuum (theoretical vacuum pressure value is 0Pa)". It compares the absolute vacuum pressure of the theoretical state. Due to the limitation of technology, we can't pump the internal pressure to the absolute vacuum value of 0Pa in any case. Therefore, the vacuum value pumped by stainless steel vacuum pump is higher than the theoretical vacuum value. So when expressed in absolute vacuum, there is no negative sign in front of the value.


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Screw vacuum pump product market

Because the screw vacuum pump only needs a pair of screws, and there is a certain gap between the screw and the screw, so when the screw vacuum pump is working, the noise is very low, the speed is uniform, the most important thing is that there is no need for lubricating oil during the operation, so the dry screw vacuum pump can operate in the environment with a lot of water vapor, which is a very energy-saving vacuum product. 

Now in the market with the continuous screw vacuum pump products, the general vacuum pump can not be satisfied with the oil-free condition, so the dry screw vacuum pump competition in the market is growing, so the screw vacuum pump has replaced many vacuum pump products, many oil vacuum pump has been replaced by oil-free vacuum pump, now many companies have replaced screw vacuum pump 。

Therefore, the market of screw vacuum pump is getting better and better, so the prospect of screw vacuum pump is naturally very good. The future development trend of screw vacuum pump is environmental protection: with the increasingly serious pollution problem in recent years, the topic of environmental protection has been mentioned again and again, so the production and production of various products in the future should pay more attention to environmental protection.

What problems do vacuum pump need to deal with to achieve the purpose of environmental protection and energy conservation and emission reduction? The answer is noise reduction. The development of new materials and new skills will promote the reduction of oscillation and noise. We will work together to deal with the problem of oil injection and oil leakage of pumps, so as to achieve the purpose of cleaning the environment. We will carry out personalized and refined development: we will satisfy the increasingly diversified needs of different categories.

Water Ring Vacuum Pump

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Environmental protection water ring vacuum unit

The environmental protection water ring vacuum unit is designed and optimized according to the requirements of modern enterprises for environment and environmental protection, integrating the characteristics of various industries. The manufacturing unit is composed of water ring vacuum pump, waterway system, vacuum system, cooling system, silencing system and control system. It is mainly designed and manufactured according to the specific conditions of customers 

1. Ensure that the gas and liquid with pollution are concentrated and will not leak, and truly achieve zero pollution

2. Low noise, the use of noise abatement facilities, will not cause noise pollution, especially suitable for the working environment of man and machine together

Application: daily chemical, medical (especially dental), food, pharmaceutical, electronic, laboratory.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Heating problem of screw vacuum pump

With the development of industry now, we should be very familiar with the screw vacuum pump, because its characteristics are widely used, in order to understand it better, let's understand the heating problem of screw vacuum pump together. 

Now the screw vacuum pump has excellent corrosion resistance. When using the screw vacuum pump, we will encounter the situation that the inner wall temperature of the reducer is very high two hours after starting. This situation is very unusual for machinery and equipment. Therefore, we should solve it immediately. If the temperature does not drop, please note that the oil window on the screw vacuum pump cannot be used with the plexiglass plate. Lift the low temperature cooler to the vacuum pumping position of screw vacuum pump, and apply cooling water of minus 10 degrees to reduce the temperature.

Screw vacuum pump manufacturers remind to reduce the temperature of working fluid in front of screw vacuum pump, measures should be taken to reduce the temperature, less than 20 degrees, in order to achieve better results.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Application of water jet pump

It is used in vacuum distillation, concentration, dehydration, decolorization, dryness, crystallization, filtration, degassing, material transportation, tail gas and dust absorption, etc. 

It is used for secondary steam eruption and condensation. In some process, many secondary steam will need to be condensed. At the same time, a small amount of non condensable gas also needs to be discharged to maintain normal production. This kind of water eruption pump is also called water eruption condenser, which takes condensation as the main and exhaust as auxiliary.

It is used in vapor-liquid mass transfer and absorption. The liquid flowing out at high speed meets the ejected gas. The process of gas flow trapped by jet is also the process of vapor-liquid two-phase mixing. Because the gas-liquid two-phase of the water jet pump has a large touch surface, and the high-speed jet has a great speed, which greatly strengthens the speed of the mass communication process in the absorption and mass transfer, and accelerates the chemical reaction or material transfer process. Therefore, the water jet pump has the effect of both the reactor and the pump

In many large chemical plants and chemical fertilizer plants, steam or hot water with certain energy is often discharged to form power waste. Water jet pump is used to eject low-energy fluid with few jars of high-energy fluid, so as to increase the energy of the fluid and then use it in the production process.

The high-energy fluid, which is used in the transfer of fluid power, ejects the low-energy fluid participating in the reaction to replace the power equipment for transporting the fluid.

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Knowledge of oil free vacuum pump

Oil free vacuum pump is a kind of mechanical vacuum pump which can run without any oil lubrication. The oil-free vacuum pump can only be used with the cooperation of the front stage pump. It has a large pumping speed in a wide pressure range and is not sensitive to dust and water vapor in the extracted gas. It is widely used in metallurgy, chemical industry, food, electronic coating and other industries. 

The advantages and disadvantages of oil-free vacuum pump have the advantages of simple structure, easy operation, convenient maintenance and no environmental pollution. The oil-free vacuum pump has good durability. It is a vacuum pump, compression and dual-purpose vacuum pump. It is a basic equipment with a wide range of applications to obtain vacuum.

Compared with oil pump, oil-free vacuum pump has low vacuum degree and small pumping capacity, but it is small in size, easy to install, easy to maintain, convenient to move, no oil fume and no pollution to the environment, especially in the laboratory with high requirements. It is also one of the most common equipment in the laboratory.

Therefore, when purchasing the oil-free vacuum pump, the vacuum degree required to work must be determined first. If the demand is high, the vacuum pump selected should be higher than the required vacuum degree. Otherwise, the vacuum pump can not meet the requirements of vacuum pumping, and the working requirements will not be met. Secondly, the pumping rate of oil-free vacuum pump should be slightly greater than the required pumping rate, so as to better meet the needs. Finally, see whether the extracted gas is corrosive. Corrosive gas will corrode the pump, so special materials must be used to meet the demand.

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Double stage slide valve vacuum pump with high pumping speed

For a long time, there are many difficulties and challenges in the development of double stage slide valve vacuum pump in our country. The production of 2H-150 and other products took more than 20 years after the standard was formulated. In fact, the design and manufacture of double stage slide valve vacuum pump with large pumping speed will encounter a series of problems, such as dynamic balance, control of two-stage oil supply, noise reduction and so on. However, the double stage slide valve vacuum pump with high pumping speed has a wide application prospect 

Due to the structural characteristics, the capacity of the slide valve pump is much larger than that of the rotary vane pump. Because the slide valve vacuum pump can work in poor vacuum environment for a long time, it is often used in large vacuum equipment. The limit pressure of single-stage pump is between 0.6 PA and 1.3 PA (gas shut-off) and that of double-stage pump is 0.06 PA.

Pumping speed ≥ 150L / s can be regarded as a large-scale slide valve pump. For a long time, there are only 70L / s two-stage slide valve pump in China. However, if there is a double-stage slide valve vacuum pump with high pumping speed, it is particularly beneficial to simplify the unit structure of vacuum equipment, reduce power consumption, achieve energy-saving effect, simplify operation and improve control reliability.

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Pump valve industry market

 

Driven by industrialization, urbanization, reform and globalization, the prospect of China's pump and valve equipment manufacturing industry is still broad. In the future, high-end, localization and modernization of pump and valve industry will be the main development direction of pump and valve industry in the future. The pursuit of continuous innovation, to create a new market for valve enterprises, so that enterprises in the increasingly fierce competition in the pump valve industry tide to survive and seek development.

With the continuous development of pump valve technology and the continuous expansion of pump valve application field, the corresponding pump valve standard is more and more indispensable. The products of pump and valve industry have entered a period of innovation. Not only the product categories need to be updated, but also the internal management of enterprises needs to deepen the reform according to the industry standards.

Therefore, it is necessary to make full use of the existing standards, look forward to the future, and develop new standards and systems that can be applied in the future, so as to promote the development of pump valve technology at a higher level. In the future, the industry of pump and valve will develop in two main directions: one is to develop from single product to multi variety and multi specification; the other is to develop in the direction of energy saving.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Mixing principle of vacuum pump oil

According to the understanding of the vacuum pump factory: at present, the vacuum pump oil is not supplied in time in the market or there is a lack of suitable varieties in the market. Sometimes, there are problems of mixed use of vacuum pump oil in the process of using, including domestic oil and foreign oil, different types of oil in domestic oil, different manufacturers or different brands of the same kind of oil, mixing of new oil with "old" oil in use, etc. 

At present, many users have a lot of randomness in choosing alternative oil or mixed use of vacuum pump oil. However, it should be noted that different types of vacuum pump oil have different physical and chemical properties. Its chemical composition, viscosity, acid value and various additives (anti-wear agent, preservative, antioxidant, rust inhibitor) and other main components and indicators directly affect the operation of the machine. Zhaoqing vacuum pump factory is located here The improper use of the pump will not only remind the user of the use of oil, but also change the service life of the pump. Therefore, the following principles should be observed when using the mixed oil.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Pressure parameters of vacuum system

Pressure parameter can be seen everywhere in vacuum system, which refers to the vertical force of gas on the surface of solid or liquid, and it is synonymous with pressure in vacuum system.

The most common pressure parameter is naturally the limit pressure. Limit pressure is one of the main parameters of vacuum pump performance in vacuum system. Popular understanding is that in the process of vacuum system pumping, after a long time of pumping, when the pumping speed of vacuum pump or vacuum unit is 0 or the pressure parameters of vacuum chamber are always maintained at a certain value, that is the limit pressure of vacuum pump or vacuum unit.

The second is work pressure. Working pressure is the pressure parameter necessary to ensure the process implementation and product quality in the enterprise production process. In the process of vacuum equipment selection, in order to meet the process requirements, the limit pressure of the equipment will be about an order of magnitude lower than the working pressure.

Foundation pressure. In some process fields or technicians, the base pressure is also called background pressure, which refers to the pressure in the vacuum chamber when the production process begins to be implemented. For example, magnetron sputtering applications may need to pump the local pressure to 10-4 PA, while the working pressure of sputtering process may be about 1 PA.

Residual pressure. In some cases, residual pressure is the same as the limit pressure, which refers to the total pressure of residual gas in the vacuum chamber after a period of pumping operation of vacuum pump or vacuum unit. If the vacuum system has no pumping speed at this time, the residual pressure is the limit pressure of vacuum pump or vacuum unit.

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

Gas drainage by vacuum pump / compressor

There are several basic forms of gas drainage by imported vacuum pump / compressor 

According to the relationship between coal mining and drainage: pre pumping before mining, that is, the drainage of coalbed methane from the undeveloped coal seam. Because the mining area is wide and the pipeline is long, it usually has dozens of kilometers. The working environment is bad, so the imported vacuum pump / compressor is required to have large air volume, high vacuum degree and reliable operation. At present, the imported vacuum pump / compressor is designed and manufactured with international advanced technology, and the gas volume can reach 500 ~ 70000m3 / h, which can fully meet the needs of coal mining industry. This pumping method has gradually become the mainstream. This method not only becomes the guarantee of safe production, but also becomes a new clean energy, which has strategic significance for China, a big coal country. Pumping while excavating and mining while pumping, that is, CBM drainage in the process of coal seam mining. After mining drainage, namely abandoned mine, mining roadway CBM drainage.

The drainage method is divided into: drilling drainage, drilling coal seam, and using loosening technology to increase the release area and conduction of coalbed methane, so as to make the rapid release of coalbed methane. Reduce the release in the process of excavation. This method has good effect and high utilization rate of coalbed methane. Generally, imported vacuum pump / compressor is used for pumping. Roadway method drainage, the goaf roadway, mining roadway gas drainage, to ensure the safe concentration. It includes surface vertical well pumping, mixed pumping, etc.

The target layers of electric drainage include: extraction from mining layer, drainage from adjacent strata, drainage from goaf, etc. The technology of gas drainage is to set up a gas pumping station on the ground and connect with the drainage borehole through the underground gas drainage pipeline system. When the pump is running, it will cause negative pressure, and the gas will be pumped out into the gas tank or directly supplied to the user. If the amount of gas extracted is small or unstable, it can be directly discharged into the atmosphere.

According to the specific location and layout of the mine excavation, the imported vacuum pump station is generally set on the ground (underground). The enclosure (shed) of the gas drainage room should ensure that there are no residents within 50m around the gas drainage room, no open fire within 20m, no inflammable and explosive materials, and four dry powder fire extinguishers and no less than 0.5m ~ yellow sand are installed.

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Corrosion resistant high suction self priming pump

In many working conditions, because the suction inside the container itself is negative pressure, a large suction self-priming pump is needed to suck out the liquid in the container. Then the self-priming pump must first consider the vacuum negative pressure higher than the container. For example, the negative pressure value in a container is -0.08mpa. Under this condition, the vacuum degree of the self-priming pump must be higher than-0.09mpa, so it must be considered Select high negative pressure self-priming pump products. 

For example, our self-priming pump with fast water absorption has a negative pressure of -0.09mpa at the inlet. If the container and the pump are installed on the same plane, we can choose the high suction self-priming pump product. However, we should consider the choice of high suction self-priming pump products when the flow rate should be doubled.

For example, if the required flow rate is 2m3 / h, then we should select 4m3 / h self-priming pump when selecting high suction self-priming pump products. It should be noted that if the pump outlet pipeline system is not the same negative pressure, we need to install linkage valve and check valve at the outlet, and then close the outlet valve before starting the high suction self-priming pump, and then open the outlet valve after the high suction self-priming pump runs Just the door. The series of corrosion-resistant high suction self-priming pump materials are mainly divided into various stainless steel materials, PP polypropylene materials, PVDF fluoroplastic materials, Hastelloy steel materials for different working conditions.

CL Sereis Cone Liquid Ring Vacuum Pump

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Parameters and classification of vacuum pump

The selection of pumping principle or vacuum pump is limited by specific parameters. These parameters are: minimum pressure, pressure range, pumping speed, exhaust pressure. In the ultra-high vacuum range, there are two other parameters: Pump selectivity and residual gas composition. The exhaust pressure is the pressure that the pump can exhaust under this pressure. According to this point of view, vacuum pumps can be roughly divided into three categories:

1) A pump that exhausts air into the atmosphere. This kind of pump is generally called rough pump or front stage pump. The air in the system is removed to a certain required working pressure, which is called rough pumping of the system. At the outlet of another pump to maintain a required low pressure is called the pre stage pressure. Mechanical rotary pump and jet pump are typical crude pump or pre stage pump.

2) A pump that exhausts only below atmospheric pressure. This kind of pump needs a front stage pump (Shenlian) to exhaust air into the atmosphere. Diffusion pump, roots pump and molecular pump all belong to this type. They all need a front stage pump.

3) A pump that binds the gas and steam in the system. This kind of pump does not need air outlet and is made according to the principle of ionization or absorption.

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Introduction of air-cooled self circulating water ring vacuum pump unit

In the process of using water ring vacuum pump, because water is used as working fluid, and working fluid water is continuously injected into the pump, many users do not pay attention to environmental protection when directly working fluid (water) is discharged through the drain outlet of vacuum pump, which makes the waste of water resources and environmental pollution, and even increases the use cost of enterprises. Some users will make water tank for water ring vacuum pump alone or use soda separator at the upper position. The water ring vacuum pump will enter the water pump into the water tank or soda separator, and then it will be sucked into the pump cavity through the self-priming capacity of the pump itself, and then it will be discharged into the water tank to make the reciprocating cycle, but the working process of the water ring vacuum pump will generate heat, such as the invalid power heat of the vacuum pump and the heat of the vacuum pump As a result, the heat of the vacuum pump will be higher and higher in the water temperature of the water tank, and the higher the water temperature of the working fluid, the efficiency of the vacuum pump, many users will add water to the side of the water tank, so it will also lead to waste of water resources and environmental pollution.

In view of the above problems, the R & D team of Feiyao company independently developed the air-cooled self circulating water ring vacuum pump unit in combination with the characteristics of the water ring vacuum pump, cooled the circulating working liquid water through air cooling to ensure the water temperature requirements of the water ring vacuum pump, thus ensuring the service life of the water ring vacuum pump and zero discharge of the used working liquid (water).

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How to use vacuum solenoid valve in vacuum system

How to use vacuum solenoid valve in vacuum system?

How to use vacuum solenoid valve in vacuum system Vacuum solenoid valve is a special valve for vacuum installed on mechanical vacuum pump. The valve and the pump are connected to the same power source. The opening and stopping of the pump directly control the opening and closing of the valve. How to use vacuum solenoid valve in vacuum system?

Vacuum solenoid valve is a special vacuum valve installed on a mechanical vacuum pump. The valve and the pump are connected to the same power source. The opening and stopping of the pump directly control the opening and closing of the valve. When the pump stops working or the power supply is suddenly interrupted, the valve can automatically close the vacuum system and fill the atmosphere into the pump cavity through the air inlet of the pump to prevent the pump oil from flowing back and polluting the vacuum system. The working medium for vacuum solenoid valve is air and non-corrosive gas.

How to use the vacuum solenoid valve in the vacuum system mainly includes the following points:

1. Before installing the vacuum solenoid valve, you should carefully read the instruction manual of the product, check whether the product fully meets the requirements for use, be familiar with the installation points, and make preparations.
2. During installation, the coil of the vacuum solenoid valve is upward and maintains a vertical position. The arrow or mark on the ZCA vacuum solenoid valve should be consistent with the flow direction of the pipeline.

3. Ordinary vacuum solenoid valves should not be used in flammable and explosive dangerous places.

4. When the vacuum solenoid valve fails, in order to isolate the ZCA vacuum solenoid valve in time and ensure the normal operation of the system, it is best to install a bypass device.

5. Do not install the vacuum solenoid valve in the low recess of the pipeline, so as to avoid steam condensate, impurities and other deposits in the valve and hinder the action.

6. In the case of insufficient pipeline rigidity, it is recommended to fix the front and rear pipes of the vacuum solenoid valve with a bracket to prevent vibration caused by the ZCA vacuum solenoid valve during operation.

7. Before taking over, fully flush the pipeline with a pressure of 0.3MPa to completely remove the metal powder sealing material residues and rust in the pipeline; the working medium of the vacuum solenoid valve should be clean and free of particles; impurities, it is recommended to install a filter in front of the valve. Install steam traps in the steam line; dirt and filters on the inner surface of the inlet solenoid valve must be cleaned regularly.

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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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