Oil-sealed mechanical vacuum pump according to the structure can be divided into fixed-chip, rotary chip and slide valve three. They all use vacuum pump oil to lubricate, seal and cool down. Both are driven by the rotor in the pump housing to periodically change the volume between the rotor, the vane and the pump housing so as to achieve the purpose of pumping and exhausting. First, the fixed-slice vacuum pump Its simple structure and long service life, easy maintenance, two-stage pump ultimate vacuum up to 10-3Torr, but the pumping speed is small, the application is small. Second, the rotary vane vacuum pump is divided into single-stage rotary vane vacuum pump (stator, rotary vane, rotor and other components, only one studio) and two-stage rotary vane vacuum pump (which consists of two studios, two rooms before and after the series , With the same speed rotation, â… room for the former room â…¡). Third, the slide valve vacuum pump is mainly made by the pump body and the eccentric rotation of the internal slide valve components, semi-circular slide valve guide, exhaust valve, shaft and other components.