Scroll Compressor Asymmetric Stepped Portions Prevent Overcompression
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Solution Overview
Problem
In three-dimensional compression-type scroll compressors, unequal pressures in compression chambers due to differing stepped portion heights on stationary and orbiting scrolls lead to overcompression, particularly during intermediate periods requiring low pressure ratios, reducing compression efficiency.
Innovation Solution
The compressor design includes end-plate and wall-portion stepped portions on the scrolls, where the compression chamber with higher pressure communicates with the discharge or extraction port before the one with lower pressure, ensuring balanced pressures and preventing overcompression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If stepped portions with different heights are provided on stationary and orbiting scrolls, then compression efficiency is improved through three-dimensional compression, but pressure imbalance occurs between compression chambers causing overcompression
Solution Approach 1:
The invention applies different stepped portion heights at different locations on the scrolls. Specifically, the stationary scroll has a first stepped portion with height H1, while the orbiting scroll has a second stepped portion with height H2 where H1 ≠ H2. This local differentiation creates three-dimensional compression chambers with varying heights, enabling improved compression efficiency while maintaining pressure balance through asymmetric design.
Solution Approach 2:
The invention employs asymmetric stepped portion design where the stationary and orbiting scrolls have different stepped portion heights. The stationary scroll's stepped portion has height H1 and the orbiting scroll's stepped portion has height H2, with H1 ≠ H2. This asymmetric configuration prevents pressure imbalance between compression chambers while achieving three-dimensional compression, resolving the contradiction between compression efficiency and pressure balance.
2Productivity
If stepped portions are provided on both stationary and orbiting scrolls, then manufacturing complexity increases, but compression performance is improved
Solution Approach 1:
Instead of providing stepped portions on both scrolls with the same height, the invention applies stepped portions with different heights (H1 on stationary scroll, H2 on orbiting scroll) at specific locations. This localized differentiation maintains manufacturing simplicity while achieving the desired compression performance through asymmetric three-dimensional compression chamber formation.
Data Source
AI summary
A scroll compressor with a stationary scroll, an orbiting scroll, and a discharge port through which a fluid that has been compressed by both the scrolls is discharged. An end plate of the orbiting scroll is provided with an end-plate side stepped portion formed such that, along a spiral of a spiral wrap, the height thereof increases toward a central side of the spiral and decreases toward an outer end side thereof. A spiral wrap of the stationary scroll is provided with a wall-portion side stepped portion formed corresponding to the end-plate side stepped portion such that the height thereof decreases toward the central side of the spiral and increases toward the outer end side thereof. A pair of compression chambers face each other. The ventral side compression chamber communicates with the discharge port before the dorsal side compression chamber communicates with the discharge port.