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

Abstract

The invention discloses a straight claw rotor of a claw type vacuum pump and a profile design method of the straight claw rotor. The straight claw rotor is composed of eleven segments of curves comprising four segments of arcs, two segments of elliptical arcs, two segments of elliptical arc envelope lines, one segment of equidistant curve of a cycloid, one segment of line segment and one segment of envelope line. The rotor uses the elliptical arcs and the envelope lines of the elliptical arcs to construct the profile at the top of a claw and the tip of the claw, and uses the arcs and the equidistant curve of the cycloid to construct the profile at the bottom of the claw, adjacent curves are all connected smoothly, no non-smooth connection point exists, and the mechanical properties, the meshing performance and the sealing performance of the straight jaw rotor are improved. Two rotors meshing with each other are identical and the correct meshing of the profile can be achieved. The rotorhas a smaller clearance volume and improves the compression ratio of the claw vacuum pump. The top of the claw is more flat, the meshing range is large, a mesh line is long, and abrasion is further reduced. The rotor enriches profile types of claw type rotors and promotes the development of claw type vacuum pumps.

Description

technical field [0001] The invention relates to a claw vacuum pump, in particular to a straight claw rotor of the claw vacuum pump and a design method thereof. Background technique [0002] The claw vacuum pump is a dry vacuum pump widely used in petrochemical, pharmaceutical, and food fields. It has the advantages of simple structure, stable operation, and low noise; the claw rotor is the core component of the claw vacuum pump, and the claw rotor It is composed of a pair of rotors that can realize conjugate meshing. The synchronous and opposite double-rotation motion of the rotors is realized through the synchronous gears, so as to realize the periodic change of the volume of the working chamber, complete the suction, compression and discharge process of the gas, and achieve the purpose of continuous vacuuming . [0003] The profile line and meshing performance of the claw rotor directly determine the performance of the claw vacuum pump. The common straight claw rotor prof...

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Problems solved by technology

[0003] The profile line and meshing performance of the claw rotor directly determine the performance of the claw vacuum pump. The common straight claw rotor profile consists of 3 arcs, 2 cycloids, 1 line and the envelope of 1 line. , the straight claw rotor is connected by a line segment at the claw arm, which improves the mechanical properties of the claw arm and reduces the stress concentration at the claw arm. The sealing performance is poor; in order to improve the performance of common straight claw rotors, a Chinese patent (patent number: ZL201610880226.4) proposes a fully smooth straight claw claw rotor. The equidistant curve of the epicycloid, the equidistant curve of a short epicycloid, the envelope of a line segment and a line segment, realize the smooth connection between all curves, there is no cusp, and improve The sealing performance, mechanical properties and meshing performance of the rotor are improved; however, when the pair of straight claw rotors mesh with each other, due to the existence of the clearance volume, the efficiency of the claw vacuum pump is reduced. Sharp point, but the range of engagement is still not flat enough, and the engagement line is shorter, which still causes some wear

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