Scroll Compressor Shoulder Segmentation for Stress Distribution
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Solution Overview
Problem
The challenge is to increase the shoulder section height in scroll compressors for three-dimensional compression while ensuring sufficient wrap strength, particularly under high suction pressure conditions, where stress concentration at the base of the shoulder sections is a concern.
Innovation Solution
The solution involves constructing the shoulder sections on the end and bottom surfaces of the spiral wraps as multiple shoulder sections with equal base stresses, where the shoulder-to-shoulder distance is set to H ≥ 2L1 or H ≥ α(L + Lr) to disperse stress evenly, and providing ribs at the bases to enhance strength, along with chamfers or braces to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the shoulder section height is increased to achieve three-dimensional compression and increase displacement, then the compression volume increases, but the stress concentration at the base of the shoulder sections increases, reducing wrap strength
Solution Approach 1:
The shoulder sections are divided into multiple segments (first, second, third, and fourth shoulder sections) arranged at different angular positions around the spiral wrap. This segmentation distributes the stress concentration that would otherwise occur at a single base location, allowing the shoulder height to be increased for three-dimensional compression while maintaining wrap strength through distributed stress support.
2Productivity
If the shoulder section height is increased to increase displacement, then the compression volume increases, but the stress due to pressure difference at the outward side becomes large, requiring greater wrap strength
Solution Approach 1:
Multiple shoulder sections are positioned at different angular locations (including inward and outward sides) to distribute the pressure difference stress. The first and second shoulder sections are on the inward side while the third and fourth are on the outward side, creating a balanced stress distribution that enables increased displacement without excessive stress concentration.
Solution Approach 2:
The shoulder sections are asymmetrically positioned with different numbers on the inward side (first and second) versus the outward side (third and fourth). This asymmetric arrangement optimizes the stress distribution pattern to specifically address the higher stress conditions on the outward side where the spiral wrap height is greater, while maintaining overall structural integrity.
Data Source
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AI summary
Provided is a scroll compressor that is capable of three-dimensional compression, sufficiently ensuring a required wrap strength while sufficiently increasing a shoulder section height of a spiral wrap, and facilitating wrap processing. The scroll compressor includes shoulder sections (16F and 16G) at an end surface (16D) and a bottom surface (16E) of spiral wraps (15B and 16B) of a paired fixed scroll member (15) and revolving scroll member (16) and configured to be capable of three-dimensional compression in a circumferential direction and a height direction of the spiral wraps by setting a spiral wrap height of the spiral wraps further toward the outside of the shoulder sections greater than the spiral wrap height of the inward side, and wherein the shoulder sections provided on the end surface (16D) and the bottom surface (16E) at the spiral wrap are constructed of a plurality of shoulder sections (16L and 16M), and the heights of the shoulder sections (16F and 16G) are set to heights in which base stresses at the shoulder sections are substantially equal.