Scroll Compressor Asymmetric Step Mesh Gap Design
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Solution Overview
Problem
The existing scroll compressors with step-like shaped scroll members suffer from reduced compression efficiency due to gas leakage through minute gaps formed between the stepped sections, as one step mesh gap becomes smaller while the other becomes larger during operation, leading to inefficient compression.
Innovation Solution
The scroll compressor design optimizes step mesh gaps by setting different step-mesh-gap values for when the scrolls move together and apart, with a smaller gap at the end of the meshing process and an asymmetrical cross-sectional shape to increase contact area, reducing leakage and enhancing sealing ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If equal step mesh gaps are set between stepped sections when operation is stopped, then manufacturing and setup are simplified, but gas leakage increases during operation due to tilting of the revolving scroll
Solution Approach 1:
The patent applies asymmetry by setting different step mesh gap values for the fixed scroll and revolving scroll. Specifically, the step mesh gap on the fixed scroll is set larger than that on the revolving scroll, creating an asymmetric configuration that compensates for the tilting effect during operation. This asymmetric design ensures that even when the revolving scroll tilts, the overall gap configuration maintains optimal sealing, thereby reducing gas leakage while remaining manufacturable.
2Power
If the revolving scroll tilts during compression operation, then compression ability is improved, but step mesh gaps become unbalanced causing increased leakage
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring asymmetric step mesh gap values before operation begins. The fixed scroll is designed with a larger step mesh gap than the revolving scroll, creating a compensatory effect that counteracts the tilting-induced gap imbalance during compression. This preliminary configuration ensures that the tilting motion, while necessary for compression ability, does not result in excessive leakage, thus maintaining energy efficiency.
3Productivity
If step mesh gaps are minimized to reduce leakage, then compression efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by differentiating the step mesh gap specifications at different locations - specifically, the fixed scroll has a larger step mesh gap while the revolving scroll has a smaller gap. This localized differentiation allows each component to have optimized gap dimensions that collectively achieve low leakage without requiring ultra-precise manufacturing across all surfaces. The asymmetric local specifications balance compression efficiency with manufacturability.
Data Source
AI summary
A scroll compressor having an improved compression efficiency by optimizing a step mesh gap in an operating state is provided. The scroll compressor having a step-like shape has a step-mesh-gap set value (Hf) occurring between step side surfaces of a connecting wall 12h of a fixed scroll 12 and a connecting edge 13e of a revolving scroll 13 and a step-mesh-gap set value (H0) occurring between step side surfaces of a connecting wall 13h of the revolving scroll 13 and a connecting edge 12e of the fixed scroll 12, and a fixed-side set value (Hf in the example shown in the drawing) for when the two move close together due to the revolving scroll tilting by receiving gas pressure during operation is set greater than that (H0 in the example shown in the drawing) for when the two move apart.