Total-smooth claw type rotor

Abstract

The invention discloses a total-smooth claw type rotor. The rotor profile line is composed of 9 curves including the equidistant curve AB of the prolate epicycloid of a front claw arm, the front claw tip arc BC, the claw top arc CD, the rear claw tip arc DE, the equidistant curve EF of the curtate epicycloid, the pitch circle arc FG, the bottom claw tip arc GH, the equidistant curve HI of the prolate epicycloid of a rear claw arm and the claw bottom arc IA. Every two adjacent curves are connected smoothly, no non-smooth connection point or cuspidal point exists, and thus areas prone to abrasion, deformation and stress concentration are effectively avoided; the two claw type rotors which conduct synchronous opposite-direction double-rotation motion can be engaged correctly, and thus the sealing property, the mechanical property and the engagement property of the claw type rotors can be effectively improved; and the clearance volume is reduced, local high pressure is avoided in the mixing process, the power consumption of a claw type vacuum pump can be effectively reduced, the working efficiency of the claw type vacuum pump is remarkably improved, and the claw type rotor has important significance in the development of the claw type vacuum pump.

Description

technical field [0001] The invention relates to a claw vacuum pump, which is a fully smooth claw rotor suitable for the claw vacuum pump. Background technique [0002] The claw vacuum pump is a kind of positive displacement vacuum pump, which has the advantages of dry oil-free, simple and compact structure, and high pumping speed. The claw rotor is the key component of the claw vacuum pump; during work, the volume of the working chamber changes periodically through the synchronous and opposite double-rotation movements of two claw rotors with the same shape and meshing with each other to complete the gas recovery. Suction, compression and discharge process. [0003] The meshing characteristics of the rotor profile directly determine the working performance of the claw rotor. The commonly used claw rotor profile is composed of 3 cycloids and 3 arcs. In order to improve its performance, the Chinese patent (patent number: ZL201110308963.4 ) proposed a new claw rotor. The prof...

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Problems solved by technology

[0003] The meshing characteristics of the rotor profile directly determine the working performance of the claw rotor. The commonly used claw rotor profile is composed of 3 cycloids and 3 arcs. In order to improve its performance, the Chinese patent (patent number: ZL201110308963.4 ) proposed a new claw rotor. The profile of the claw rotor is composed of 5 segments of arcs and 3 segments of equidistant curves of cycloids. The smooth connection of the arc with the cycloid and the claw top arc, however, still has the following disadvantages: ① There are sharp points or The connection point is not smooth, and it is easy to generate stress concentration and deformation at the sharp point; ②The left rotor claw back EF and the right rotor claw back ef do not participate in the meshing during the working process, resulting in poor sealing and greater Large leaks greatly reduce the working efficiency of the claw vacuum pump

Chinese patent (publication number: CN104929942A) proposes a fully meshing claw rotor. The profile of the claw rotor consists of 5 circular arcs, 2 cycloid equidistant curves, 1 straight line and 1 straight line. Composed of envelope lines, the correct meshing between two claw rotors that perform synchronous and opposite double-rotation movements is realized; however, the claw rotor does not realize all the smooth connections between its rotor profiles, and there are still rough joints. Connection point, the connection point H between the envelope GH of the line segment and the equidistant curve HI of the cycloid is an unsmooth connection point

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