Vacuum pump is a device which can produce, improve and maintain vacuum in a closed space by various methods. Vacuum pump can be defined as a device or equipment that uses mechanical, physical, chemical or physical chemical methods to extract air from the container to obtain vacuum. With the development of vacuum application, there are many kinds of vacuum pumps, whose pumping speed is from 0.5 liter per second to hundreds of thousands and millions of liters per second. Limit pressure (limit vacuum) ranges from coarse vacuum to extremely high vacuum above 10-12pa.
Vacuum pumps are used in many different fields. They mainly exist in the fields of laboratory, pharmaceutical industry, filtration and mass spectrometry.
Each application requires a special type of vacuum. For example, mass spectrometry requires a pressure between 10-3 and 10-4 mbar. Therefore, it is not necessary to use the technology that can produce ultra-high vacuum.
If your application involves the agricultural food industry, drying, vacuum metallurgy or distillation, then you will need a rough vacuum.
If you are involved in vacuum mixing or beam welding, we recommend that you switch to a high vacuum.
However, if you are engaged in surface state physics or particle acceleration, we recommend ultra-high vacuum.
Due to the wide range of working pressure involved in the vacuum application department, it is impossible for any type of vacuum pump to be fully applicable to all working pressure ranges. Different types of vacuum pumps can only be used according to different working pressure ranges and different working requirements. In order to use conveniently and meet the needs of various vacuum processes, various vacuum pumps are sometimes combined according to their performance requirements and applied in the form of units.
In recent years, with the continuous and high-speed development of China’s economy, the downstream application industry related to vacuum pump has maintained a rapid growth momentum. At the same time, driven by the continuous expansion of the application field of vacuum pump and other factors, China’s vacuum pump industry has achieved sustained, stable and rapid development.
According to the performance of vacuum pump, it can undertake the following tasks in various vacuum systems.
(1) Main pump. In a vacuum system, a vacuum pump used to obtain the required vacuum.
(2) Crude pump. A vacuum pump that starts at atmospheric pressure and reduces the system pressure to another pumping system.
(3) Front stage pump. A vacuum pump used to maintain the front stage pressure of another pump below its maximum allowable front stage pressure. The front pump can also be used as a crude pump.
(4) Maintain the pump. In the vacuum system, when the air volume is very small, the main pre-stage pump cannot be used effectively. Therefore, a small capacity auxiliary pre-stage pump is arranged in the vacuum system to maintain the normal operation of the main pump or the low pressure vacuum pump required for the evacuated container.
(5) Coarse (low) vacuum pump. A vacuum pump that starts at atmospheric pressure, reduces vessel pressure and operates in a low vacuum range.
(6) High vacuum pump. Vacuum pump working in high vacuum range.
(7) Ultra high vacuum pump. Vacuum pump working in ultra-high vacuum range.
(8) Booster pump. It is installed between the high vacuum pump and the low vacuum pump to improve the air extraction system, the air extraction within the intermediate pressure range or the vacuum pump (such as mechanical booster pump and oil booster pump) to reduce the capacity requirements of the front stage pump.
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