Scroll Compressor Discharge Cover for Noise Reduction
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Solution Overview
Problem
Low-pressure type scroll compressors generate noise due to the high discharge rate of refrigerant and oil, and there is a shortage of oil for lubrication as they are discharged together, leading to direct collisions and increased noise.
Innovation Solution
A scroll compressor design with multiple discharge chambers and an oil return path, where the discharge cover guides the refrigerant and separates oil, reducing noise by slowing down the discharge rate and allowing oil to return to the oil storage through a capillary pipe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If refrigerant and oil are discharged together through a single discharge port, then the discharge process is simple, but noise is generated due to high discharge rate and direct collision with the upper cover
Solution Approach 1:
The single discharge port is divided into multiple discharge ports (first discharge port, second discharge port, third discharge port) that discharge refrigerant and oil separately at different locations and directions. This segmentation prevents the high-speed collision of mixed refrigerant and oil with the upper cover, thereby reducing noise while maintaining a relatively simple overall discharge structure.
2Productivity
If refrigerant and oil are discharged together at high rate, then the discharge efficiency is high, but noise is generated due to direct collision
Solution Approach 1:
Oil is extracted from the mixed refrigerant-oil flow and discharged through a separate oil discharge port located at the lower portion of the discharge cover. This allows the main refrigerant discharge to occur at optimized locations and angles, reducing high-speed collision noise while maintaining high discharge efficiency for both refrigerant and oil.
3Device complexity
If refrigerant and oil are discharged together through discharge pipe, then the discharge system is simple, but oil shortage occurs for lubrication
Solution Approach 1:
The discharge system is segmented into separate refrigerant discharge paths and oil discharge paths with dedicated discharge ports. The oil discharge port is specifically positioned at the lower portion of the discharge cover to enable oil to return to the oil sump for reuse, ensuring adequate lubrication while maintaining a simple overall discharge system architecture.
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 design significantly reduces noise by decelerating the discharge of refrigerant and oil, preventing direct collisions, and ensures adequate oil lubrication by separating and returning the oil, resulting in improved performance and reduced noise levels.
Implementation Method 1
allowing return of the separated oil through a capillary pipe
Data Source
AI summary
A scroll compressor includes a fixed scroll, an orbiting scroll orbiting the fixed scroll to perform compression on a refrigerant, a discharge cover provided at an upper end of the fixed scroll and guiding discharge of a compressed refrigerant, a first discharge chamber from which the compressed refrigerant is discharged; a second discharge chamber communicating with the first discharge chamber and separating oil from the discharged refrigerant, and a third discharge chamber communicating with the second discharge chamber and guiding discharge of the separated refrigerant.