Generally, it can be defined as a device that produces, improves and maintains a vacuum state in a closed space connected by tones in an appropriate way. With the rapid development of vacuum technology application, the working principle, shape and application environment of vacuum acquisition equipment have been developed in a variety of ways. For example, the pumping speed range of pumps has risen from zero to hundreds of thousands or millions of liters per second.
According to different working principles, vacuum pumps can be divided into two types: gas delivery pumps and gas trapping pumps. Among them, the gas pump includes: liquid ring vacuum pump (water ring vacuum pump), reciprocating vacuum pump, rotary vane vacuum pump, fixed vane vacuum pump, slide valve vacuum pump, cycloid vacuum pump, dry vacuum pump, Roots vacuum pump, molecular vacuum pump, traction molecular pump, compound vacuum pump, water jet vacuum pump, gas jet pump. Jet pump, steam jet pump, diffusion pump, etc. Gas trapping pumps mainly include: adsorption pumps and low temperature pumps.
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