Scroll Compressor Thrust Mechanism for Refrigerant Leakage Suppression
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Solution Overview
Problem
In scroll compressors, there is a significant risk of refrigerant leakage from the high-pressure chamber to the low-pressure chamber due to the flow of fluid between the sliding surfaces of the movable and fixed scrolls, which reduces efficiency and increases noise.
Innovation Solution
A thrust receiving mechanism with dynamic pressure generation portions and a buffer space is implemented on the movable scroll, directing low-pressure fluid into high-pressure areas and storing excess fluid in a buffer space to prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spiral groove mechanisms are formed on the ring-shaped plate to generate dynamic pressure, then slidability is increased and leakage is reduced, but fluid from the high-pressure chamber leaks to the low-pressure chamber through the gap between sliding surfaces
Solution Approach 1:
The ring-shaped plate is divided into multiple independent spiral groove mechanisms arranged in the circumferential direction. Each groove mechanism independently generates dynamic pressure to control fluid flow in its specific region, preventing high-pressure fluid from leaking to the low-pressure chamber while maintaining slidability.
Solution Approach 2:
Different regions of the ring-shaped plate have different groove configurations optimized for local fluid flow control. The grooves are designed with specific inclinations and tapers to locally generate dynamic pressure that directs fluid from high-pressure to low-pressure sides, preventing leakage at each location.
2Loss of substance
If grooves are formed to direct low-pressure fluid to high-pressure side, then fluid leakage is suppressed, but the structure becomes more complex
Solution Approach 1:
Multiple spiral groove mechanisms are merged into a single integrated ring-shaped plate structure. This unified design allows the plate to simultaneously perform thrust reception and fluid flow control through its groove patterns, reducing overall structural complexity while effectively suppressing fluid leakage from the high-pressure chamber.
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
This configuration suppresses the leakage of high-pressure fluid to the low-pressure side, maintaining stable slidability and enhancing the compressor's efficiency and reducing noise.
Implementation Method 1
a fluid on a low-pressure side is directed toward a high-pressure side by each groove, and a fluid on a high-pressure side outside sliding surfaces is less likely to enter a gap between the sliding surfaces
Implementation Method 2
the fluid that has flowed out from the first groove into the gap between the sliding surfaces can be stored in the buffer space
Data Source
AI summary
Disclosed is a thrust receiving mechanism that makes it difficult for a fluid in a high-pressure space to leak to a low-pressure space side. A thrust receiving mechanism is provided on a back surface of a movable scroll that slides relative to a fixed scroll while rotating eccentrically, and is configured for generating a dynamic pressure on the back surface of the movable scroll, and the thrust receiving mechanism includes a dynamic pressure generation portion including a first groove communicating with a low-pressure side, and a second groove communicating with a buffer space between a radial inner end and a radial outer end of the thrust receiving mechanism.