Compressor Bushing Design for Scroll Sealing Efficiency
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Solution Overview
Problem
Existing compressors in climate-control systems face inefficiencies due to the reliance on large annular recesses and sealing members that are dependent on the drive bearing diameter, limiting the surface area and net axial biasing force, which affects the sealing and machining of orbiting scrolls.
Innovation Solution
The compressor design incorporates a bushing with a first and second member, where the second member extends radially to engage a sealing member in an annular recess, creating a biasing chamber that is not dependent on the drive bearing diameter, allowing for a smaller annular recess and increased surface area for sealing and axial biasing, and includes a needle bearing within the hub of the orbiting scroll.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large annular recesses and sealing members dependent on drive bearing diameter are used, then sealing is achieved, but surface area for axial biasing force is reduced and machining flexibility is limited
Solution Approach 1:
The bushing is divided into two distinct members: a first member (inner bushing) disposed within the hub between the hub and crankpin, and a second member (outer bushing) extending radially from the first member to engage the sealing member in the annular recess. This segmentation allows the sealing function to be decoupled from the biasing chamber surface area, resolving the contradiction by enabling both effective sealing and sufficient surface area for axial biasing force.
2Reliability
If sealing members with larger diameter are used to ensure sealing, then sealing reliability improves, but manufacturing complexity and device complexity increase
Solution Approach 1:
The bushing structure acts as an intermediary component between the crankpin and the sealing member. The second member of the bushing engages the sealing member in the annular recess, allowing the sealing function to be achieved independently of the drive bearing diameter. This intermediary structure eliminates the direct dependency between sealing member size and bearing diameter, reducing device complexity while maintaining sealing reliability.
Data Source
AI summary
A compressor includes a non-orbiting scroll, an orbiting scroll, a driveshaft, a bearing housing and a bushing. The non-orbiting scroll includes a first spiral wrap. The orbiting scroll includes an end plate having a first side and a second side. The first side has a second spiral wrap that extends therefrom and meshingly engages with the first spiral wrap of the non-orbiting scroll. The second side has a hub extending therefrom. The driveshaft has a crankpin that is received in the hub and that drives the orbiting scroll. The bushing includes a first member and a second member. The first member is disposed within the hub of the orbiting scroll between the hub and the crankpin of the driveshaft. The second member extends radially from the first member and is disposed between the hub and the bearing housing.