Scroll Compressor Housing Radial Pressure Buffering
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Solution Overview
Problem
The variation in the position of the supporting portion connected to the pressing portion in scroll compressors reduces sealing performance and efficiency due to the pressure applied from the casing, leading to inefficiencies in the compressor.
Innovation Solution
The configuration securely receives radial pressure from the casing through a body portion that extends radially, reducing position variation and enhancing sealing performance between the fastening face and the fixed scroll, while also allowing for a downsized housing and improved welding by arranging the pressing and weld portions side by side in the circumferential direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressing portion is pressed against the casing to fix the housing, then the housing is securely fixed to the casing, but the position of the supporting portion varies between before and after fixing, reducing sealing performance
Solution Approach 1:
A buffer portion is introduced as an intermediary element between the pressing portion and the supporting portion. This buffer portion absorbs the positional variation caused by pressing the housing against the casing, preventing the variation from being transmitted to the supporting portion. Consequently, both reliable fixing and maintained sealing performance are achieved simultaneously.
2Manufacturing precision
If the axial length of the gap is increased to accommodate pressing deformation, then the supporting portion position stability is improved, but the housing size increases
Solution Approach 1:
The housing is segmented into distinct functional portions: a pressing portion for securing the housing to the casing, a buffer portion for absorbing positional variation, and a supporting portion for supporting the scroll. This segmentation allows each portion to be optimized independently, enabling the buffer portion to compensate for pressing deformation without requiring an overall increase in housing size.
Solution Approach 2:
The axial length of the gap is optimized within a specific range (greater than or equal to the axial length of the inner peripheral surface of the supporting portion) to provide sufficient buffering capacity while minimizing housing size. This parameter optimization allows the buffer portion to effectively absorb pressing deformation without excessive increase in housing dimensions.
3Device complexity
If the pressing portion and supporting portion are integrated directly, then the housing structure is simplified, but the position variation of the supporting portion cannot be reduced
Solution Approach 1:
The housing is divided into functionally distinct portions including the pressing portion, buffer portion, and supporting portion. This segmentation introduces the buffer portion as a dedicated element to absorb positional variation, which would not be possible in a directly integrated structure. The segmentation enables the buffer portion to isolate the supporting portion from pressing-induced variations.
Solution Approach 2:
The buffer portion serves as an intermediary element between the pressing portion and the supporting portion. It mediates the mechanical connection by absorbing the positional variation generated during pressing, thereby protecting the supporting portion from position changes while maintaining the integrated housing structure.
Data Source
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AI summary
A housing (21) includes a bearing portion (22), a body portion (23) continuous with the bearing portion (22) and extending radially outward, a pressing portion (24) provided radially outside the body portion (23) and pressing a casing (10), and a supporting portion (25) extending toward a fixed scroll (30). An end face of the supporting portion (25) near the fixed scroll (30) is a fastening face (25a) to which the fixed scroll (30) is fastened. A gap (G1) is formed between an inner peripheral surface of the casing (10) and outer peripheral surfaces of the body portion (23) and the supporting portion (25). An axial length (L1) of the gap (G1) is greater than or equal to an axial length (L2) of an inner peripheral surface of the supporting portion (25).