Scroll Compressor Deformable Sealing Ring Back Pressure Stability
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Solution Overview
Problem
Scroll compressors operating in low compression ratio regions experience unstable back pressure in the back pressure chamber, leading to reduced stability of the orbiting and fixed scrolls, causing potential failure in maintaining close contact and efficient operation.
Innovation Solution
Incorporation of deformable sealing rings with cut portions, including a first and second cut portion, arranged between the fixed and orbiting scrolls and between the frame and orbiting scroll, which adjust diameter to maintain close contact with the scroll and frame grooves, respectively, to prevent refrigerant leakage and maintain stable back pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid sealing ring is used between the fixed scroll and orbit scroll, then the sealing structure is simple, but the sealing effectiveness deteriorates under pressure changes causing refrigerant leakage
Solution Approach 1:
The sealing ring is designed with a cut portion that allows it to dynamically deform in response to pressure changes. When pressure differential increases, the sealing ring deforms to maintain contact with the groove, ensuring continuous sealing effectiveness under varying operating conditions without requiring complex adjustable mechanisms.
Solution Approach 2:
The sealing ring's physical state is changed by introducing a cut portion that enables deformation. This parameter change allows the sealing ring to transition from a rigid structure to a flexible one that can adapt its shape based on pressure conditions, improving sealing effectiveness while maintaining structural simplicity.
2Reliability
If the sealing ring is made deformable with cut portions, then the sealing effectiveness improves under pressure changes, but the manufacturing complexity increases
Solution Approach 1:
The sealing ring is segmented by introducing cut portions that divide the continuous ring structure. This segmentation enables the ring to deform independently in response to pressure changes, improving back pressure stability. The manufacturing process is simplified by creating discrete cut sections rather than requiring complex continuous deformation mechanisms.
3Productivity
If the orbiting scroll and fixed scroll maintain close contact, then the compression efficiency is high, but the stability deteriorates in low compression ratio regions due to reduced back pressure
Solution Approach 1:
The deformable sealing ring provides feedback mechanism by automatically adjusting its deformation based on back pressure conditions. When back pressure is sufficient, the ring maintains normal deformation. When back pressure decreases in low compression ratio regions, the ring's deformation responds to pressure changes, helping maintain the close contact between scrolls and ensuring operational stability.
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 deformable sealing rings effectively stabilize the back pressure chamber by adjusting to pressure changes, ensuring consistent contact and minimizing refrigerant flow, thereby enhancing the operational stability and efficiency of the scroll compressor.
Implementation Method 1
a sealing ring arranged between the fixed scroll and the orbit scroll to prevent the refrigerant in the back pressure chamber from flowing in or out through a gap between the fixed scroll and the orbit scroll, wherein the sealing ring includes a cut portion cut for the sealing ring to be deformable in a circumferential direction
Data Source
AI summary
Provided is a scroll compressor with enhanced sealing structure of a back pressure chamber. The scroll compressor includes a housing, a fixed scroll fixed to inside of the housing and including a fixed wrap, an orbit scroll including an orbit wrap which forms a compression chamber together with the fixed wrap, a back pressure chamber formed at a frame supporting the orbit scroll, and accommodating refrigerant for pressurizing the orbit scroll to a direction of the fixed scroll, and a sealing ring arranged between the fixed scroll and the orbit scroll to prevent the refrigerant in the back pressure chamber from flowing in or out through a gap between the fixed scroll and the orbit scroll, wherein the sealing ring includes a cut portion cut for the sealing ring to be deformable in a circumferential direction.