Scroll Compressor Wraps with Recesses and Protrusions
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Solution Overview
Problem
Scroll compressors with irregular wrap curves between the fixed and orbiting wraps experience interference and gaps due to the orbiting motion, leading to abrasion and refrigerant leakage, which are not effectively managed by existing designs.
Innovation Solution
The design incorporates interference avoiding portions with increased spacing and gap compensating portions with reduced spacing on the sidewall surfaces of the wraps, specifically formed as recesses and protrusions to align with the irregular arc connections, ensuring the orbiting radius varies to prevent frictional loss and refrigerant leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the wrap curve of the fixed wrap and the orbiting wrap is irregular in the turning direction, then the compression ratio can be improved, but a great interference or gap is generated between the wraps
Solution Approach 1:
The patent applies local quality by creating specific recesses and protrusions at critical locations on the wrap curves. Instead of making the entire wrap uniform, the invention introduces localized geometric modifications (recesses at interference-prone areas and protrusions at gap-prone areas) to address the harmful effects only where they occur, while maintaining the beneficial irregular wrap curve shape for compression ratio improvement throughout the rest of the wrap structure.
2Ease of operation
If the Oldham ring is provided to prevent rotation of the orbiting scroll, then the orbiting motion is induced, but a gap is formed between the key and key groove which causes temporary rotation
Solution Approach 1:
The patent applies preliminary action by pre-positioning recesses and protrusions on the wraps before operation begins. These geometric features are designed in advance to compensate for the gap formation between the Oldham ring's key and the key groove. The recesses and protrusions act as pre-established compensation mechanisms that automatically adjust for rotational deviations, preventing temporary rotation issues before they affect compression chamber integrity.
3Power
If the number of turns of the wrap is increased to obtain sufficient compression ratio, then the compression ratio is improved, but the compressor size is increased
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the wrap curves through the introduction of recesses and protrusions. Instead of increasing the number of turns to achieve higher compression ratio, the invention changes the local geometry parameters (depth and position of recesses, height and position of protrusions) to optimize compression efficiency. This allows achieving sufficient compression ratio with fewer turns, thereby reducing compressor size while maintaining performance.
Data Source
AI summary
A compressor is provided. The compressor may include a fixed wrap, and an orbiting scroll having an orbiting wrap engaged with the fixed wrap to form compression chambers. The fixed wrap and the orbiting wrap may have irregular wrap curves. At least one interference avoiding portion at which a spacing between the wraps is greater than an orbiting radius or at least one gap compensating portion at which the spacing between the wraps is smaller than the orbiting radius, in a state in which a center of the fixed scroll and a center of the orbiting scroll are aligned with each other, may be provided on a sidewall surface of the fixed wrap or the orbiting wrap, whereby frictional loss or abrasion due to interference between the wraps or a refrigerant leakage due to a gap between the wraps may be prevented.