Scroll Compressor Auxiliary Discharge Grooves
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Solution Overview
Problem
In scroll compressors, the presence of liquid refrigerant can lead to abnormal pressure buildup in compression chambers, potentially deforming the volute walls and reducing the compressor's reliability, and existing solutions that incorporate auxiliary discharge ports to mitigate this issue require a wider volute wall design, which increases the compressor's size and reduces compression chamber volume.
Innovation Solution
The design includes auxiliary discharge ports on the fixed base plate positioned differently from the main discharge port, with grooves connected to these ports that are partially covered by the orbiting volute wall, ensuring that the compression chamber connected to the auxiliary discharge port is isolated from other compression chambers and the main discharge port, allowing for early discharge of refrigerant and preventing pressure buildup without increasing the compressor's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If auxiliary discharge ports are formed in the volute wall, then liquid refrigerant can be discharged early to prevent abnormal pressure buildup, but the volute wall width must be increased which reduces compression chamber volume and increases compressor size
Solution Approach 1:
The auxiliary discharge ports are relocated from the volute wall to the base plate, changing the spatial dimension where the discharge function is implemented. This allows the volute wall to maintain its original width while still providing auxiliary discharge capability through ports in the base plate, thereby preserving compression chamber volume while preventing liquid compression
2Reliability
If auxiliary discharge ports are formed in the volute wall, then liquid refrigerant can be discharged early to prevent abnormal pressure buildup, but the compressor size must be increased
Solution Approach 1:
The auxiliary discharge ports are positioned in the base plate rather than the volute wall, transferring the discharge function to a different component and spatial location. This eliminates the need to increase volute wall width, allowing the compressor to maintain its original compact size while still achieving early discharge of liquid refrigerant through the base plate ports
3Reliability
If the volute wall is made wider to accommodate auxiliary discharge ports, then auxiliary discharge function is achieved, but the compression chamber volume is reduced
Solution Approach 1:
The discharge function is segmented between the main discharge port and auxiliary discharge ports, with the auxiliary ports located in the base plate rather than requiring expansion of the volute wall. This segmentation allows the volute wall to maintain its original dimensions and preserve compression chamber volume while the auxiliary ports in the base plate provide the additional discharge pathway needed for pressure control
Data Source
AI summary
A scroll compressor includes a fixed scroll and an orbiting scroll. A base plate of at least one of the fixed scroll and the orbiting scroll includes an auxiliary discharge port and a groove. The groove is partially covered with an orbiting volute wall facing the groove, so that a compression chamber that is in a compression process and is connected to the auxiliary discharge port is not connected to other compression chambers in a compression process or to a compression chamber connected to a main discharge port. The groove is always connected to one of the compression chambers.