Scroll Compressor Pin-and-Ring Engagement Geometry
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Solution Overview
Problem
Scroll compressors experience decreased compression performance due to increased compression leakage caused by improper engagement between gear surfaces of orbiting and fixed scrolls, resulting from mismatched orbiting radii defined by pins, rings, and ring holes.
Innovation Solution
The orbiting scroll is engaged with a front case using pins and rings or ring holes, where the inside diameter of the rings or ring holes defines an orbiting radius larger than the theoretical orbiting radius, and the pins or rings are shifted to relieve twisting, ensuring proper engagement and preventing rotation relative to the fixed scroll.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the orbiting radius defined by pins and rings is made larger than the theoretical orbiting radius, then engagement failure between gear surfaces is prevented, but the orbiting scroll may twist (rotate) relative to the fixed scroll
Solution Approach 1:
The patent applies parameter changes by deliberately setting the orbiting radius defined by pins and rings to be larger than the theoretical orbiting radius, and by positioning pins at specific angular locations (e.g., 0°, 180°) relative to the theoretical engagement points. This parameter adjustment simultaneously prevents engagement failure while controlling scroll orientation through the geometric relationship between pin positions and gear tooth profiles.
2Stability of the object's composition
If the orbiting radius defined by pins and rings is made smaller than the theoretical orbiting radius, then the orbiting scroll engages properly with the fixed scroll, but engagement failure may occur
Solution Approach 1:
The patent applies beforehand cushioning by designing the pin-and-ring mechanism with an orbiting radius deliberately larger than the theoretical minimum, creating a safety margin that prevents engagement failure under various operating conditions. This design cushioning ensures reliable engagement while maintaining proper scroll orientation.
3Object-generated harmful factors
If pins and rings are positioned at theoretical engagement points, then compression leakage is minimized, but assembly difficulty increases due to precise positioning requirements
Solution Approach 1:
The patent applies asymmetry by positioning pins at specific angular locations (e.g., 0°, 180°) that are asymmetric relative to the gear tooth profiles, rather than at symmetric theoretical engagement points. This asymmetric positioning simplifies assembly by providing clear alignment references while maintaining effective engagement to minimize compression leakage.
Data Source
AI summary
A scroll compressor includes an orbiting scroll engaged with a front case by pins and rings or ring holes to prevent rotation of the orbiting scroll. The rings or the ring holes have such an inside diameter that an orbiting radius defined by the pins and the rings or the ring holes is larger than a theoretical orbiting radius defined by engagement between gear surfaces of a fixed scroll and the orbiting scroll. The pins, the rings, or the ring holes are shifted in such a direction as to relieve twisting of the orbiting scroll relative to the fixed scroll.