Scroll Compressor Floating Member Clearance for Tilt Lubrication
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Solution Overview
Problem
The tilting of the movable scroll in a scroll compressor can lead to a decrease in bearing reliability due to the floating member losing contact with the movable scroll, resulting in poor lubrication and seizing, as the floating member follows the tilt, preventing effective oil flow.
Innovation Solution
A configuration where a clearance is maintained between specific portions of the movable scroll and the floating member, allowing for continuous oil supply and formation of an oil film even when the movable scroll tilts, thereby preventing seizing and maintaining the floating member's support function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the floating member closely contacts the movable scroll to follow its tilt, then the floating member maintains support function, but oil flow is blocked causing poor lubrication and seized contact portions
Solution Approach 1:
The back surface of the movable scroll is divided into different regions: a first portion that contacts the floating member and a second portion that does not contact, creating local quality differences. This allows the contact region to provide lubrication while the non-contact region accommodates tilt movement, resolving the contradiction between maintaining contact for support and preventing seizing through oil flow.
2Reliability
If the floating member follows the tilt of the movable scroll, then support function is maintained, but clearance between components decreases blocking oil supply
Solution Approach 1:
The back surface of the movable scroll is segmented into a first portion facing the floating member and a second portion facing away, allowing differential behavior between regions. The first portion maintains contact for lubrication while the second portion provides clearance for tilt accommodation, ensuring continuous oil supply even during tilt movement.
3Adaptability or versatility
If the movable scroll tilts during operation, then compression function is maintained, but the floating member contact geometry changes causing poor lubrication
Solution Approach 1:
By creating local quality differences on the back surface of the movable scroll through the first and second portions, the design allows the contact region to adapt to tilt while maintaining lubrication, and the non-contact region to accommodate the tilt geometry, resolving the contradiction between adaptability and reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures consistent lubrication and supports the movable scroll effectively, preventing the floating member from impairing its function, even under conditions of tilt and deformation, thus enhancing the bearing reliability.
Implementation Method 1
oil is less likely to flow into a space between the movable scroll and the floating member, causing poor lubrication
Data Source
AI summary
A scroll compressor includes a compression mechanism having a fixed scroll and a movable scroll, and a floating member supporting the movable scroll. The floating member includes an opposing surface opposed to a back surface of the movable scroll. The back surface of the movable scroll includes a first portion facing an inner portion of the opposing surface of the floating member, and a second portion facing an outer portion of the opposing surface of the floating member. A clearance is present between the inner portion of the opposing surface and the first portion of the back surface.