Straight claw type rotor profile for dry vacuum pump and design method of straight claw type rotor profile

Abstract

The invention belongs to the technical field of dry vacuum pumps, and particularly relates to a straight claw type rotor profile for a dry vacuum pump and a design method of the straight claw type rotor profile. Comprising a claw tip straight line ef, a claw arm cycloid fg, a claw bottom arc gh, a claw bottom cycloid hi, a claw bottom straight line ij, an acute angle removed arc jk, a pitch circle arc kl, a pitch circle small arc la, a pitch circle arc ab, a claw arm arc bc, a claw arm straight line cd and a claw top arc de which are anticlockwise connected end to end; the cycloid fg at the claw arm is a long-breadth epicycloid f'g 'obtained according to a molded line equation of the long-breadth epicycloid, the long-breadth epicycloid f'g' is equidistantly obtained, and the equidistantly obtained cycloid fg at the claw arm intersects at a claw tip straight line ef and a claw bottom arc gh; according to the invention, the pitch circle position is changed into three sections of arcs with different radiuses, so that the rotor is prevented from being scratched due to high temperature or medium action in the working process, the uniformity of a meshing gap in a thermal state is improved, and stable and efficient operation is ensured.

Description

technical field [0001] The invention belongs to the technical field of dry vacuum pumps, in particular to a straight claw rotor profile for dry vacuum pumps and a design method thereof. Background technique [0002] The claw rotor is the core component of the claw vacuum pump. During the working process of the claw vacuum pump, the two rotors rotate counterclockwise, the suction port is connected to the pump chamber, the volume of the pump chamber becomes larger, and the suction is sucked. When the rotor closes the suction port When the suction ends, the pump cavity becomes smaller and the gas is compressed. When the exhaust port is opened, the pump cavity is exhausted, and when the exhaust port is closed, the exhaust is completed, and the cycle works. [0003] During the working process, the meshing characteristics of the two rotors play a key role in its vacuum performance, and the profile of the claw rotor directly determines the key performance of the vacuum pump. Exist...

AI Technical Summary

Problems solved by technology

The existing straight claw rotor profile, the common straight claw or curved claw rotor profile is composed of arcs, straight lines, straight line envelopes, cycloids, etc., while the existing straight claw rotor profile There are sharp angles and sharp points. When the claw vacuum pump is working, there is a gap between the rotors, which affects the pumping performance of the dry vacuum pump. Therefore, it is necessary to design a new type of straight claw rotor profile.

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