In oil-sealed rotary vane vacuum pump, the belt-driven rotary vane vacuum pump is customarily called in China, while the direct-coupled rotary vane vacuum pump is directly connected with the motor or with the coupling. In each pump, there are single-stage and double-stage. In single-stage pumps, the limit pressure and usage of pumps are different due to the different structure and parameters.
Their common characteristics are simple structure, easy use, starting from atmospheric pressure, direct discharge of the atmosphere, small eccentric mass, simple maintenance, the limit pressure of two-stage pump is 6 *10-2~l *10-2 Pa, one single-stage pump can reach about 4 Pa, the other single-stage pump is about 50-200 Pa.
Dual-stage rotary vane vacuum pump station can be widely used in refrigerators, air conditioners, light bulbs, fluorescent lamps, bottle gall production and electronics, metallurgy, medicine, chemical industry, oil filter, printing machinery, packaging machine and other industries. It can be used as the front-stage pump of diffusion pump, Roots pump, molecular pump, etc., to supply electronic instruments, medical instruments and other supporting and experimental research applications. Because direct pump has no dust pollution caused by belt friction, its volume is small, weight is light, material is saved, function is improved day by day, and it is more widely used.
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