Scroll Compressor Discharge Groove for Reduced Resistance
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Solution Overview
Problem
In scroll compressors, the differing compression ratios of the first and second compression chambers lead to operational inefficiencies and increased vibration and noise due to the misalignment of the repulsive and reaction forces, and the limited opening area of the second compression chamber discharge inlet results in discharge resistance and noise during initial discharge.
Innovation Solution
The scroll compressor design features a connection groove connecting the first and second discharge inlets to a single discharge outlet, and the fixed and orbiting wraps have non-involute curves to optimize compression ratios, reducing the number of discharge valves and enhancing the opening area for initial discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the orbiting wrap and boss are spaced apart in axial direction, then the compression ratio is improved, but the repulsive force and reaction force act at different positions causing tilt and increased vibration
Solution Approach 1:
A communication hole is introduced as an intermediary structure connecting the first and second compression chambers. This allows the refrigerant to flow between chambers and balance the forces acting on the orbiting scroll, reducing vibration and noise while maintaining the improved compression ratio from axial spacing.
2Device complexity
If the second compression chamber has a small opening area of discharge inlet, then the structure is compact, but discharge resistance increases and noise occurs during initial discharge
Solution Approach 1:
The communication hole is positioned to open in advance before the main discharge inlet, allowing the refrigerant to begin flowing through a larger combined area. This preliminary opening action reduces discharge resistance and prevents noise during the initial discharge phase, while the overall structure remains compact.
Solution Approach 2:
The discharge inlets of the first and second compression chambers are merged into a common discharge passage through the communication hole. This combination creates a larger effective opening area for discharge, reducing resistance and noise while maintaining structural compactness.
3Productivity
If the first and second compression chambers individually include discharge holes and discharge valves, then each chamber can discharge independently, but the number of valves increases causing more valve-hitting noise
Solution Approach 1:
The discharge valves of the first and second compression chambers are merged into a single common discharge valve that controls flow through the communication hole and main discharge inlet. This reduces the number of valves from two to one, significantly reducing valve-hitting noise while maintaining efficient discharge capability through the combined passage.
Data Source
AI summary
A scroll compressor is provided, that may include a connection groove to reduce discharge resistance. The scroll compressor may include a fixed scroll including a fixed end plate and a feed wrap and an orbiting scroll, rotating with respect to the fixed scroll and including an orbiting end plate and an orbiting wrap, and structure in which a connection groove having a concave groove shape provided at an inner surface of the fixed end plate to allow a refrigerant to flow through the connection groove depending on an overlapping state of the fixed wrap and the connection groove, thereby providing an effect of increasing opening efficiency of discharge holes at a beginning of discharge.