Scroll Compressor Step Portion Placement for Chip Gap Control
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Solution Overview
Problem
In scroll compressors with three-dimensional compression structures, the reduced area of the reference surface for determining parallelism between spiral wraps leads to variations in chip gaps, increasing fluid leakage and reducing efficiency.
Innovation Solution
A scroll fluid machine design where one scroll has a step portion on the blade bottom surface and the other on the blade tip surface, with the blade bottom surface without a step portion serving as the reference surface, increasing the reference surface area and reducing chip gap variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If step portions are provided on the blade tip surface and blade bottom surface of both the fixed scroll and the orbiting scroll to achieve three-dimensional compression, then the compression efficiency is improved, but the reference surface area for determining parallelism is reduced, causing chip gap variation and fluid leakage
Solution Approach 1:
The patent divides the step portions into different locations on different scrolls: one scroll has a step portion only on its blade bottom surface, while the other scroll has a step portion only on its blade tip surface. This segmentation allows each scroll to maintain a complete reference surface on the opposite side, resolving the parallelism issue while preserving three-dimensional compression capability
Solution Approach 2:
The patent creates an asymmetric configuration where the fixed scroll and orbiting scroll have step portions at different locations (one on blade bottom, the other on blade tip). This asymmetric arrangement ensures that each scroll has an uninterrupted reference surface, allowing for accurate chip gap setting while maintaining the three-dimensional compression structure
2Shape
If the reference surface area is reduced due to step portions on both scrolls, then the three-dimensional compression structure is achieved, but the chip gap parallelism varies, increasing fluid leakage
Solution Approach 1:
By segmenting the step portions to different scrolls and different surfaces (blade bottom vs. blade tip), the patent ensures that each scroll maintains a complete reference surface area, preventing chip gap variation and reducing fluid leakage while preserving the three-dimensional compression shape
Solution Approach 2:
The patent converts the potential harm of reduced reference surface area into a benefit by strategically placing step portions only on specific surfaces of specific scrolls. This allows the three-dimensional compression structure to be maintained while the unaffected surfaces provide adequate reference areas for parallelism, thus converting the structural complexity into an advantage
Data Source
AI summary
One of a pair of a fixed scroll and an orbiting scroll is the scroll including a step portion provided only at a predetermined position along a spiral direction on a blade bottom surface of a spiral wrap, and the other one of the scrolls is the scroll including a step portion provided only at a predetermined position along a spiral direction on a blade tip surface of a spiral wrap. A blade bottom surface of an end plate of the fixed scroll is set as a reference surface for setting a chip gap between both the scrolls. When a wrap height of the spiral wrap of the orbiting scroll is represented by (L) (Lo, Li) and a wrap height of the spiral wrap of the fixed scroll is represented by (lo, li), L (Lo, Li)>1 (lo, li) is satisfied.