Scroll Compressor Main Bearing Seat Stiffness Matching
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Solution Overview
Problem
The existing thrust design of scroll compressors experiences significant wear and deteriorated lubrication due to high temperatures and heavy loads, especially when using special refrigerants like R32, leading to uneven stress distribution and inadequate lubrication.
Innovation Solution
A main bearing seat with a thrust portion featuring multiple suspension portions arranged axially, having opposite rigid and flexible ends, and grooves that form suspension portions to adjust overall rigidity and facilitate better deformation coordination with the orbiting scroll, enhancing contact stress distribution and lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid thrust design is used to support heavy loads, then load-bearing capacity is improved, but wear increases due to uneven stress distribution and deteriorated lubrication
Solution Approach 1:
The thrust portion is divided into multiple suspension portions (first, second, third suspension portions) that can independently deform. This segmentation allows each portion to adapt to local stress conditions, distributing the load more evenly across the thrust surface and reducing concentrated wear while maintaining overall load-bearing capacity.
Solution Approach 2:
The suspension portions are designed with different rigidity characteristics (rigid end and flexible end) to create a dynamically adaptable thrust surface. Under heavy load, the flexible ends deform to accommodate surface irregularities and maintain uniform stress distribution, preventing localized wear while supporting the required load.
2Stability of the object's composition
If the thrust surface is made more rigid to maintain stability, then structural stability is improved, but lubrication deteriorates due to uneven contact stress
Solution Approach 1:
Different regions of the thrust portion are assigned different rigidity properties. The rigid ends provide structural stability and maintain overall geometric integrity, while the flexible ends locally adapt to ensure uniform contact stress distribution. This local differentiation of mechanical properties simultaneously achieves structural stability and improved lubrication conditions.
3Strength
If the thrust portion is designed with high rigidity to support compression mechanism, then load support is improved, but deformation coordination with orbiting scroll bottom surface deteriorates
Solution Approach 1:
The suspension portions are designed with varying rigidity along their length, with rigid ends for structural support and flexible ends for deformation coordination. This dynamic rigidity distribution allows the thrust portion to maintain overall load support capability while enabling local deformation to coordinate with the orbiting scroll bottom surface, ensuring uniform contact and stress distribution.
Data Source
AI summary
Disclosed are a main bearing seat for a scroll compressor, and a scroll compressor. The main bearing seat comprises substantially ring-shaped thrust parts for supporting a compressing mechanism of the scroll compressor, and a main part body provided with a bearing to support a driving shaft of the scroll compressor, wherein multiple suspension parts extending in a radial direction of the scroll compressor are provided in the thrust parts, and the suspension parts are arranged in an axial direction of the scroll compressor. The main bearing seat can adjust the stiffness of the thrust parts to better achieve stiffness matching and deformation coordination with a bottom face of a movable vortex, thereby increasing the effective contact area on a contact side of a thrust surface to achieve more uniform contact stress distribution and reduce the wear, and providing an appropriate gap on a non-contact side to facilitate lubrication.