Scroll Compressor Discharge Cover Axial Spacing
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Solution Overview
Problem
In low pressure scroll compressors, the fixed scroll is pressed toward the orbiting scroll by refrigerant pressurization, increasing frictional loss between the two, which degrades compressor performance.
Innovation Solution
A discharge cover with a sealing portion that is spaced apart from the fixed scroll in the axial direction and supported by a support portion, preventing the fixed scroll from being deformed by the pressurization force and reducing frictional loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge cover is tightly fixed to the fixed scroll to prevent refrigerant leakage, then sealing performance is improved, but the fixed scroll is pressed toward the orbiting scroll by refrigerant pressurization, increasing frictional loss
Solution Approach 1:
The discharge cover is divided into two functional regions: a support protrusion at the outer circumference for axial support, and a sealing portion at the inner circumference for sealing. This segmentation allows the support function and sealing function to be separated, so the sealing portion does not press the fixed scroll against the orbiting scroll, reducing frictional loss while maintaining sealing performance.
Solution Approach 2:
The support protrusion acts as an intermediary element between the discharge cover and the container/main frame. It provides axial support to the discharge cover, preventing the sealing portion from transmitting pressurization force to the fixed scroll, thereby mediating between the need for tight sealing and the need to reduce frictional loss.
2Reliability
If the discharge cover is tightly fixed to prevent refrigerant leakage, then sealing performance is improved, but the fixed scroll deforms toward the orbiting scroll, worsening compression performance
Solution Approach 1:
The discharge cover is segmented into a support protrusion region and a sealing portion region. The support protrusion bears the axial load from refrigerant pressurization, while the sealing portion remains spaced from the fixed scroll, preventing deformation while maintaining sealing effectiveness.
Solution Approach 2:
Different regions of the discharge cover have different functions: the outer circumference (support protrusion) provides mechanical support to resist pressurization, while the inner circumference (sealing portion) provides sealing without contact under pressure. This local differentiation prevents fixed scroll deformation while maintaining sealing performance.
3Ease of manufacture
If the discharge cover structure is simplified for easier processing and assembly, then manufacturing ease is improved, but sealing effectiveness may be compromised
Solution Approach 1:
The discharge cover is designed with a simple segmented structure consisting of a support protrusion and a sealing portion. This segmentation is achieved through straightforward forming processes and requires minimal assembly steps, maintaining ease of manufacture while ensuring sealing effectiveness through the functional separation of the two regions.
Solution Approach 2:
The support protrusion automatically positions and supports the discharge cover axially during assembly, while the sealing portion self-seals against the fixed scroll discharge opening. This self-service mechanism simplifies assembly procedures while maintaining reliable sealing without requiring complex adjustment or additional components.
Data Source
AI summary
In a scroll compressor, a sealing portion of a discharge cover placed between a suction spacer and a discharge space is formed to be spaced apart in an axial direction from a fixed scroll, whereby the discharge cover is in contact with a fixture in an axial direction only on a single circumference, facilitating fabrication and assembling of the discharge cover. Also, after assembly, when the discharge cover is pressurized toward the fixed scroll by a discharge pressure of a refrigerant discharged to the discharge space, the discharge cover does not transfer pressurization force to the fixed scroll, thus reducing a frictional loss between the fixed scroll and an orbiting scroll.