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    Vacuum pump refers to the device or equipment that makes full use of mechanical, physical, chemical or physicochemical methods to extract gas from the pumped container to obtain vacuum. Generally speaking, vacuum pump is a device that uses various methods to improve, generate and maintain vacuum in a certain enclosed space.

    According to the working principle of vacuum pump, vacuum pump can be basically divided into two types, namely gas capture pump and gas transmission pump. It is widely used in metallurgy, chemical industry, food, electronic coating and other industries.

    With the development of vacuum application, many kinds of vacuum pumps have been developed, and their pumping speed has increased from a few tenths of liters per second to hundreds of thousands and millions of liters per second. With the increasing requirements for the application pressure range of vacuum technology in the field of production, manufacturing and scientific research, most of them need to be composed of several vacuum pumps to extract gas together before they can meet the requirements of production, manufacturing and scientific research process. Due to the wide range of working pressure involved in vacuum application department, Therefore, any type of vacuum pump can not be fully suitable for all working pressure ranges. Only different types of vacuum pumps can be used according to different working pressure ranges and different working requirements. In order to facilitate use and meet the needs of various vacuum processes, various vacuum pumps are sometimes combined according to their performance requirements to be applied in the form of units.

    Common vacuum pumps include dry screw vacuum pump, water ring pump, reciprocating pump, slide valve pump, rotary vane pump, roots pump and diffusion pump. These pumps are indispensable main pumps in the vacuum process in various application fields of China's national economy. In recent years, with the sustained and rapid 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 vacuum pump application field and other factors, China's vacuum pump industry has achieved sustained, stable and rapid development.