Variable-section scroll tooth of scroll compressor and profile design method of variable-section scroll tooth

Abstract

The invention discloses a variable-section scroll tooth of a scroll compressor and a profile design method of the variable-section scroll tooth. The profile of the scroll tooth is a variable circle radii involute based on a trigonometric function, namely, a trigonometric function involute; the profile of a static scroll tooth (1) comprises a first trigonometric function involute AB and a fourth trigonometric function involute GH, and the profile of a dynamic scroll tooth (2) comprises a second trigonometric function involute CD and a third trigonometric function involute EF; the dynamic scroll tooth (2) and the static scroll tooth (1) can be meshed correctly in the work process. According to the variable-section scroll tooth, the profile is simple, the number of rings of the scroll tooth and the length of a leakage line can be reduced due to the fact that the tooth thickness of the outer ring and that of the center of the static scroll tooth are relatively small and the tooth thickness of the middle of the static scroll tooth is relatively large, and therefore, the leakage rate is reduced; meanwhile, the tooth thickness of the dynamic scroll tooth is equal and relatively small, the mass of the dynamic scroll tooth is small, the inertia force is small during rotation and the dynamic property is good.

Description

technical field [0001] The invention belongs to the technical field of compressor engineering, in particular to a variable-section scroll tooth of a scroll compressor. Background technique [0002] The scroll compressor is a volumetric fluid machine. The movable scroll performs revolution and translation during the working process. The movable scroll and the fixed scroll mesh with each other to form several pairs of periodically changing crescent-shaped working chambers. With the crankshaft The continuous rotation completes the working process of gas suction, compression and discharge. Due to its remarkable features of simple structure, few parts, smooth operation, low noise and high reliability, it is widely used in the fields of air conditioning and refrigeration, medical equipment and vacuum systems. The profile of the scroll directly affects the performance of the scroll compressor, so the profile design of the scroll is extremely critical. [0003] When the compressio...

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Problems solved by technology

[0004] In view of the above-mentioned problems of high compression ratio requirements, the number of turns required for the scroll is large, the leakage line is long, and the profile composition of the existing variable-section scroll is complex, and the dynamic characteristics of the orbiting scroll are poor due to the large mass, The present invention proposes a scroll compressor with a variable cross-section scroll and its profile design method. The profile of the scroll is composed of a variable-diameter base circle involute based on a trigonometric function, that is, a trigonometric function involute , the pitch first increases and then decreases from the center to the outside, which can achieve correct meshing, and the composition of the profile is simple. The tooth thickness of the outer ring of the fixed scroll tooth and the tooth thickness at the center are small, and the tooth thickness at the middle position is relatively large. It can reduce the number of scroll rings and the length of the leakage line, and reduce the leakage; at the same time, the tooth thickness of the orbiting scroll remains unchanged, which is equal to the tooth thickness and the tooth thickness is small, the quality of the orbiting scroll is small, and the process of revolution and translation is more stable , good dynamic characteristics; the proposed variable-section scroll and its profile design method for scroll compressors are of great significance for enriching the profile types of scrolls and improving the working performance of compressors

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