Below by the dry vacuum pump manufacturers to introduce the dry vacuum pump structure is how the dry vacuum pump is made according to the task principle of screw compressor. On the market, there are two main types of its structure, mainly screw type and moment type. For details, I will introduce the structure of dry vacuum pump.
In the screw compressor, the number of turns of the rotor is within one turn, while that of the screw vacuum pump is more than two turns, which can increase the return flow and improve the compression ratio. The single-stage pump can pump from atmospheric pressure to the limit pressure of 1pA, and the pumping speed is 60-120m3 / H.
A pair of right and left rotors with rectangular cross section mesh, driven by synchronous gear to complete non-contact high-speed operation, gas enters from the upper side, condenses in the pump cavity, sweeps from the lower end of the rotor, and the rotor rotates once to exhaust. The rotor and the outer surface of the pump body form a sealing structure. There is less leakage in the rectangular section clearance, so a higher compression ratio can be lost. The compression ratio and pumping speed of the pump are related to the leading angle of the rotor, the meshing rate of the clearance between the rotor and the pump body, the number of turns, the diameter of the rotor and the rotation speed. Because of its large number of turns, higher compression ratio than the screw type mentioned above, and low pumping speed, the pump can be pumped from atmospheric pressure to the limit pressure of 10-1pa, and the pump with pumping speed of 40-80m3 / h is commercially available.
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