Scroll Compressor Varying Wall Thickness Reduces Vibration
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Solution Overview
Problem
Scroll compressors experience significant vibration due to changes in compressing force immediately before fluid discharge, which existing technologies fail to adequately address.
Innovation Solution
The scroll compressor design incorporates a varying wall thickness in the fixed and orbiting spiral walls, with a specific configuration of involute and arcuate portions, optimizing the formation point distance and orbiting angles to minimize compressing force changes and reduce vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the wall thickness of spiral walls is increased to withstand high pressure immediately before compression is completed, then the strength and durability of the spiral walls is improved, but the vibration generated by the change in compressing force is not reduced
Solution Approach 1:
The patent applies local quality by differentiating the wall thickness of spiral walls at different locations. The first portion (near the center) has increased wall thickness to withstand high pressure, while the second portion (outer region) has reduced wall thickness to decrease mass and reduce vibration. This localized differentiation resolves the contradiction between strength requirements and vibration reduction.
Solution Approach 2:
The patent changes the parameter of wall thickness along the spiral wall length. By making the wall thickness vary from the center outward (thicker at the center, thinner at the outer region), the design optimizes both structural strength where pressure is highest and vibration reduction where mass reduction is most effective.
2Object-generated harmful factors
If the formation point distance is maximized to smooth compressing force changes, then the vibration is reduced, but the structural configuration becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-configuring the spiral walls with specific geometric parameters (involute curves with defined base circles, radial direction lines, and arcuate portions) before operation. The formation point distance is predetermined through careful design of these geometric elements, allowing the system to naturally smooth compressing force changes without requiring active control or complex additional mechanisms.
Data Source
AI summary
A scroll compressor includes a fixed scroll and an orbiting scroll. An orbiting angle of the orbiting scroll when a compression chamber is formed and compression of fluid is initiated is referred to as an orbiting initiation angle. An orbiting angle of the orbiting scroll when the compression of the fluid is terminated is referred to as an orbiting termination angle. An orbiting angle of the orbiting scroll when an end of the orbiting spiral wall initiates contact with an arcuate portion of the fixed spiral wall is referred to as a distal end contact initiation angle. The formation point distance is a peak in at least one of orbiting angles obtained by subtracting integer multiples of 360° from an orbiting angle in a range from the distal end contact initiation angle to the orbiting termination angle.