Corrosion resistant vacuum unit

When we use corrosion-resistant vacuum unit, we will add check valve. You may not know the reason. Next, Schindler vacuum pump will give you an analysis of why to add check valve to corrosion-resistant vacuum unit.

1. The main function of vacuum pump is to install check valve.

2. Protection system: at the moment of pump shutdown due to fault, the inlet and system connection of corrosion-resistant vacuum unit are in vacuum state, and the outlet is generally connected with the atmosphere. The pressure will bring water into the system and destroy the system vacuum. In order to protect the system, check valves are usually installed at the pump inlet and system connection.

3. In order to protect the pump body and other equipment, a check valve is usually installed at the outlet of the corrosion-resistant vacuum unit.

4. Now more and more corrosion-resistant vacuum units install the check valve at the outlet, which can protect the pump and system.

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Vacuum gauge commonly used in semiconductor operation

The common vacuum gauges in semiconductor industry include resistance vacuum gauge (Pirani vacuum gauge), thermocouple vacuum gauge, capacitance vacuum gauge, electric ion vacuum gauge, cold cathode ionization vacuum gauge and full range vacuum gauge. The cold cathode ionization vacuum gauge can be divided into penning gauge, magnetron gauge and anti magnetron gauge. 

Full range vacuum gauge is a combination of low vacuum gauge and high vacuum gauge; resistance vacuum gauge has wide measuring range and is commonly used; thermoelectric vacuum gauge has narrow vacuum measuring range and simple structure, which is not easy to be damaged; the measurement value of capacitance vacuum gauge is not affected by gas variety; ionization vacuum gauge belongs to high vacuum gauge and will generate heat; cold cathode ionization vacuum gauge belongs to high vacuum gauge, which is not hot and easy to repair; Full range vacuum gauge active range switching, easy to use. 

Most of today's vacuum gauge probes and signal processing circuits work together, which enables anti-interference ability and promotes its miniaturization. Most probes use metal material instead of glass material, which is more robust and delicate. The vacuum gauge display controller also requires miniaturization. Some of them have a volume of 105mmx110mmx250mm and a mass of 1.3KG, with three connectors. Each connector can be connected with a resistance vacuum gauge or a cold cathode ionization vacuum gauge. This intelligent vacuum meter controller is easy to carry and use.

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Roots Blowers

Roots Vacuum Pump 

Influence of working conditions on the service life of slurry pump

Slurry pump in different industries play a different role, then the wear conditions are different, so the service life is also different. Slurry pump has been used in mineral processing, electric power, coal washing, sand separation and other fields. In the mineral processing industry, the working condition of ore primary separation is bad, so the service life of slurry pump is low. Of course, different ores have different abrasivity. 

For example, in the concentrate transportation section, the relative abrasion resistance is reduced, and the overall service life of the pump is longer. In the field of coal washing, larger coal block and coal gangue are easy to block the slurry pump, which is also easy to reduce the service life of slurry pump. In the fields of electric power, sand selection and other fields, due to the different working environment, there are different degrees of abrasion on the special pump of aerated concrete, which has a certain impact on the service life of the submerged slurry pump. Therefore, in the purchasing process, the general user often asks the service life of the supplier's products. 

Strictly speaking, any manufacturer will not promise an accurate service life cycle for users without any basis, because the service life of flow passage components depends on many different factors, and the diversity and complexity of working conditions lead to different service life of materials with the same quality. But in the early selection aspect, we can let the powerful manufacturers help to select the type. The use of aerated concrete pump is easy to wear, and its service life is also greatly affected. However, the use efficiency of slurry pump can be higher through reasonable design, correct operation and regular maintenance.

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Roots Blowers

Roots Vacuum Pump 

Maintenance of oil free vacuum pump

Oil free vacuum pump is a kind of mechanical vacuum pump which can work without any oil for smooth operation. The utility model has the advantages of simple structure, convenient operation and maintenance, and no environmental pollution. Oil free vacuum pump is a durable vacuum pump. It is a vacuum pump for vacuumizing, tightening and dual-purpose. It is the basic equipment to obtain vacuum and has a wide range of applications. Compared with the oil pump, the oil-free vacuum pump has the advantages of low vacuum degree, small volume, convenient installation, simple maintenance, easy to move, no oil fume and no environmental pollution. 

This is one of the most common devices in the laboratory. Therefore, when purchasing an oil-free vacuum pump, it is necessary to confirm the work request of vacuum degree. If the vacuum degree is high and the vacuum degree is higher than the requested vacuum degree, or the vacuum degree cannot be satisfied, the work request cannot be satisfied. The second is the pumping speed of oil-free vacuum pump, which will be slightly higher than the requested pumping speed in order to better meet the demand.

Finally, to see whether the gas can be corrosive and whether the corrosive gas can corrode the pump, special data must be used to meet the demand. The working principle of edit pump is the same as ordinary positive displacement pump. It is composed of stator, rotor, rotor, cylinder, motor and other main components. When the rotor rotates at high speed, the four radial sliding rotors in the rotor slot divide the pump chamber into four chambers.

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Dynamic equilibrium equation of vacuum system

In general, the design and calculation of vacuum system is based on the total outgassing quantity Q, and according to the characteristics of metallurgical process, the nature of gas source should also be taken as the basis of design. That is to say, the quality and quantity of gas source should be combined to determine the design scheme. 

In the process of vacuum smelting, the gas source is characterized by high temperature and a large amount of dust, oxygen, hydrogen and sometimes corrosive or toxic gases. Therefore, in some systems, it is usually equipped with dust remover, filter, chemical assembly and low pressure, and sometimes the pipeline needs water cooling. Some corrosive gases, such as the process of haimianqin, emit hydrogen chloride. The corrosion of dust on the mechanical pump oil and pump body parts is very serious, so that the pump oil has to be replaced frequently. According to the process requirements, the vacuum system composed of roots pump and water ring pump has good effect. In addition, there is the problem of discharging steam. If the vacuum system starts to be evacuated from the atmosphere, it starts to deflate at 1 ~ 10-1 Torr, while when 10-1 ~ 10-2 Torr, the surface mainly deflates water vapor in the air. This problem can be partly solved by pneumatic pump. In the ultra-high vacuum system, there is more hydrogen in the residual gas, so zirconium aluminum suction pump can also be selected.

The vacuum system can be brought into full play by selecting appropriate pumping equipment according to different gas source properties.

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Roots Blowers

Roots Vacuum Pump 

Principle and application range of diaphragm vacuum valve

Diaphragm vacuum valve is to use the valve stem to directly press the rubber diaphragm on the valve seat. 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 make the valve stem move downward, and press the rubber diaphragm directly on the valve seat to stop the air flow. Rotate the handwheel 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 valve body is made of aluminum alloy. It has the advantages of simple structure, light weight, small volume and good sealing performance. The diaphragm vacuum valve with nitrile rubber is used for the non corrosive gas on the front stage and pre pumping low vacuum pipeline and the temperature is - 25 ~ 80 ℃. The diaphragm vacuum valve with fluororubber can be used in high vacuum system with the service temperature ranging from - 30 ℃ to 150 ℃

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


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rotary vacuum pump overview

The equipment used to generate low-pressure space is called "vacuum pump", which can be generally divided into two types: the former is used to pump 1 atmospheric pressure of gas to a lower pressure, and the latter is used to pump the gas with lower pressure to lower pressure.

There are many types of front stage pumps. In terms of vacuum technology, the performance of the front stage pump is generally required to be:

1. It can pump the gas pressure in a specified container from atmospheric pressure (760 Torr) to about 10-3 Torr;

2. When the pressure is about 1 Torr, the pumping rate is comparable to its maximum pumping rate, that is, it will not fall too much.

Only the rotary vacuum pump can satisfy the two conditions at the same time. In a broad sense, rotating vacuum pump is to use mechanical rotor to expand space to obtain low pressure stock. Generally, it can be divided into rotary vane type, fixed piece type, slide valve type, centrifugal type and straw shoe type (roots pump). However, in general laboratories or industrial units requiring high vacuum, the first two are most commonly used.

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vacuum in electron beam melting furnace

Electron beam melting furnace: the electron beam melting furnace mainly uses the huge heat energy emitted by the electron beam as the heat source for smelting or alloy. It has the same function as vacuum induction furnace and vacuum arc furnace. Due to the high cost of smelting, it is only used for melting refractory metals, active metals or alloys. Most metals are smelted in other vacuum furnaces. In some special cases, such as high temperature and strict prevention of pollution, electron beam furnace is sometimes used to melt, refine and cast ingots, and the effect is very good.

The main difference between electron beam melting furnace and vacuum electric arc furnace is that the heat source comes from the arc between electrode and consumable electrode when melting metal or alloy in vacuum arc furnace. The heat of melting various materials in the electron beam melting furnace comes from the electron beam with high energy density emitted by the electron gun. Electron beam melting can avoid the pollution of electrode and keep the molten pool, so that it can be thoroughly purified, and the shape of melting material is not limited.

Generally, electron beam melting furnace consists of electron gun chamber and melting chamber. The electron gun chamber can be discharged by mechanical pump and diffusion pump to obtain the vacuum degree of 10-4 ~ 10-6 Torr. The smelting chamber can be composed of mechanical pump, booster pump and diffusion pump, or multi-stage Roots pump can be used for exhaust to obtain vacuum degree of 10-2 ~ 10-6 Torr.

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Water Ring Vacuum Pump

SSR Roots Type Blowers

High vacuum system with throttling

The pressure range of sputtering and other plasma processes is higher than that of various high vacuum pumps. These pumps can be used in the range of 0.5 to 10 Pa by adding a throttle valve between the pump and the vacuum chamber. This kind of throttle valve with small flow conductivity allows the gas from the high pressure and strong vacuum chamber to flow into the pump, while keeping the pump inlet pressure below the maximum pump pressure or critical inlet pressure. The typical sputtering chamber with cathode diameter of 150 to 200 mm has a diameter of 500 mm and a height of 250 mm. The traditional pumping unit is equipped with a 6-inch diffusion pump, but there are also some similar low-temperature pump or turbine molecular pump. The maximum displacement of such a pump is 100 to 200 PA · L / s. The pump is larger and, although more expensive, it also removes gas faster.

The problem of residual gas in the sputtering system is much larger than that in the high vacuum evaporation system. On the one hand, the plasma desorption of impurities on the wall is increased; on the other hand, the conventional sputtering deposition rate is much lower than the typical evaporation rate. Even if the production rates of the two processes are in the same order of magnitude, the sputtering films are more likely to be exposed to the residual gas impurities than the films condensed by the evaporation source. Electron ion collision desorption is an effective way to release gas from the wall of vacuum chamber, which is even more effective than mild baking. In the plasma, the desorbed gases appear to exist in the atomic state, so they can easily react with the sputtered films.

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The relationship between vapor pressure and temperature in vacuum system

The relationship between vapor pressure and temperature in vacuum system

When an airtight vacuum system is exposed to air and then pumped, if it is not baked, the partial pressure analyzer will show the peak at the mass of 18 (H2O). This will continue for weeks and months.

The table of water vapor pressure as a function of temperature indicates that the vapor pressure doubles when the temperature is increased by 12 ℃ near the room temperature. Although there is no liquid water in the system after prolonged pumping, there may be a very similar pressure temperature relationship between the surface layer of adsorbed water and the vapor pressure in equilibrium above the adsorbed layer

Honig plotted the vapor pressure of the elements over a wide temperature range in logarithmic coordinates. In the discussion, it is particularly significant that the slope of the curve. At room temperature, it is typical that the temperature increases by 20 ℃ and the pressure changes by 10 times.

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Working principle of oil sealed vacuum pump

Working principle of oil sealed vacuum pump:

By changing the mechanical vacuum pump exhaust, maintenance and Realization of collective vacuum seal oil seal, pump cavity volume of moving parts. They work in the whole plant mechanical pump cavity volume, reduce the increase in emissions. When the pump chamber becomes the capacity of the working chamber, the pump inlet is connected to the air chamber and the largest until the re suction volume is far away from the pump suction chamber for the longest time. When the volume is reduced until the atmospheric pressure of the gas is higher than that of the compressed gas discharge valve, the discharge pressure of the gas is lower.


For oil seal pump fluid:

Large mechanical vacuum pumps, even the best design, and the relative motion between components are currently used, even with high precision. Vacuum pump limit, which is difficult to prevent low true air "break through" the end of the return inlet. In addition, due to the design, manufacture and inevitable harm of the pump, and reduce the assembly clearance limit vacuum. The components of relative movement between oil sealed vacuum pumps and the sealing of exhaust valves; the opportunity of harmful space filling to make it a "breakthrough" of high pressure gas is much less, more, better sealing performance, it can pump higher vacuum.

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Extrusion process of PVC transparent sheet with vacuum unit

In plastic processing, also known as extrusion molding or extrusion, in rubber processing, also known as extrusion. It refers to a kind of processing method that materials are heated and plasticized, pushed forward by the screw through the action between the extruder barrel and the screw, and continuously made into various cross-section products or semi products through the head.

In chemical fiber industry, extruders are also used to feed spinnerets for melt spinning. Extrusion is applied to the processing of thermoplastic and rubber. It can be used for batching, granulation, rubber filtering, etc. it can be used for continuous production. It can manufacture various continuous products, such as pipe, profile, plate (or sheet), film, wire and cable coating, rubber tire tread, inner tube, sealing strip, etc., with high production efficiency. In the production of synthetic resin, the extruder can be used as a reactor for continuous polymerization and molding.

The application of vacuum unit in PVC transparent sheet extrusion production can provide a sheet extrusion production line with reasonable design, no need of labor and reduced labor intensity. It has the advantages of simple operation, convenient use, low cost, high production efficiency, energy saving and environmental protection. At the same time, it can improve the performance of plastic sheet and reduce the production cost of plastic sheet. Most of the plastic sheet production lines are adopted The multi-layer coextrusion method has the advantages of material saving, material diversification, no toxic adhesive, composite environmental protection requirements, etc.

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