Scroll Compressor Fixed Scroll Asymmetric Fluid Channel Design
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Solution Overview
Problem
Conventional scroll compressors with fluid channels notched in the external wall facing the center of the base circle suffer from reduced strength and compression performance due to pressure differences and flow pressure losses, leading to potential damage and leakage.
Innovation Solution
The scroll compressor design features fluid channels with centerlines deviated from the center of the involute base circle, directing fluid flow towards the intake of the compression chamber, with parallel side walls and wider gaps to reduce pressure loss and enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fluid channels are notched in the external wall facing the center of the base circle, then fluid can be introduced into the compression chamber, but the strength of the fixed scroll decreases due to pressure differences causing bending
Solution Approach 1:
The fluid channel is positioned asymmetrically relative to the base circle center, specifically at a radial distance of 0.05 to 0.15 times the base circle radius. This asymmetric positioning prevents the fluid channel from being directly opposite another channel through the center, thereby distributing stress more evenly and preventing fixed scroll bending while still allowing effective fluid introduction into the compression chamber.
2Ease of operation
If the opening of the fluid channel is directed towards the center of the base circle, then fluid can reach the compression chamber intake, but flow pressure loss increases due to channel bending
Solution Approach 1:
The fluid channel is designed with varying cross-sectional properties along its length. The channel width and height are optimized at different positions: the inlet end has dimensions of 0.005 to 0.015 times the base circle radius, while the outlet end has dimensions of 0.01 to 0.02 times the base circle radius. This local variation in geometry reduces flow resistance and minimizes pressure loss while directing fluid effectively toward the compression chamber intake.
Data Source
AI summary
To improve the strength of a fixed scroll of a scroll compressor and suppress the compression performance, a scroll compressor includes a fixed scroll 3 in which a spiral wall 32 is provided on an inner face of an end plate 31, an external wall 34 is provided integrally with the end plate 31 so as to surround a periphery of the wall 32, and a pair of fluid channels 36 penetrating the external wall 34 is provided. A centerline S of the fluid channel 36 is arranged to be deviated from a center O of an involute base circle of the wall.