Scroll Compressor Back Pressure Chamber Sealing With Elastic Ring
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Solution Overview
Problem
The existing scroll compressors face issues with leakage due to the separation of movable and fixed scrolls, leading to reduced sealing performance and pressure loss in the back pressure chamber, which affects the compression efficiency.
Innovation Solution
A scroll compressor design incorporating a sealing assembly with a wear-resistant ring and an elastic ring, stacked along the depth direction of a groove on the periphery of the back pressure chamber, enhancing the sealing performance by providing an elastic force that maintains contact between the movable and fixed scrolls, and featuring recesses on the elastic ring to improve elasticity and prevent pressure leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a back pressure chamber is used to generate axial reaction force, then the separation between movable scroll and fixed scroll is reduced, but leakage of compressed medium still occurs due to insufficient sealing
Solution Approach 1:
The patent employs an elastic ring as a flexible sealing element that deforms under pressure to maintain contact between the movable scroll and fixed scroll. The elastic ring's flexibility allows it to adapt to pressure changes and maintain reliable sealing, solving the leakage problem while keeping the structure simple.
Solution Approach 2:
The sealing structure combines the elastic ring with the rigid scroll components to create a composite sealing system. The elastic ring provides compliant sealing while the rigid scrolls provide structural support, achieving both durability and effective leakage prevention.
2Reliability
If the movable scroll is pressed against the fixed scroll to improve sealing, then leakage is reduced, but friction and wear increase between the friction surfaces
Solution Approach 1:
The elastic ring acts as an intermediary element between the movable scroll and fixed scroll, providing the necessary contact pressure for sealing without requiring direct high-force contact between the friction surfaces. This mediator approach maintains sealing while reducing wear on the primary friction surfaces.
Solution Approach 2:
The patent changes the pressure distribution parameter by using the elastic ring to provide localized, controlled contact pressure. This allows sufficient sealing force to be applied at the sealing interface while distributing the load to minimize wear and extend service life.
3Reliability
If sealing components are made more robust to prevent leakage, then sealing performance improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The elastic ring provides effective sealing through its flexible, deformable nature rather than through complex rigid structures. This simple flexible component achieves reliable sealing without increasing device complexity or manufacturing cost.
Solution Approach 2:
The elastic ring is designed to automatically adjust its deformation based on operating pressure conditions, providing self-regulating sealing without requiring external control mechanisms or complex adjustment systems. This self-service capability maintains simple structure while ensuring reliable sealing.
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 solution effectively enhances the sealing performance of the back pressure chamber, reducing friction and wear, and maintaining the sealing efficiency over time, thereby preventing medium leakage and ensuring consistent axial reaction force.
Implementation Method 1
the elastic force provided by the elastic ring pushes the wear-resistant ring, so that the sealing assembly is always abutted and sealed between the movable scroll and the fixed portion
Implementation Method 2
the oil film between friction surfaces of the movable scroll and the fixed scroll generates an axial force
Data Source
AI summary
A scroll compressor includes a movable scroll and a fixed portion. The fixed portion has a first bearing surface. The movable scroll has a second bearing surface. The scroll compressor includes a back pressure chamber located between the movable scroll and the fixed portion. At least one of the movable scroll and the fixed portion is provided with a groove disposed on a periphery of the back pressure chamber. The scroll compressor further includes a sealing assembly at least partially installed in the groove. One end of the sealing assembly is in contact with a groove bottom surface in the groove, and another end of the sealing assembly is in contact with the first bearing surface or the second bearing surface. The sealing assembly includes a wear-resistant ring and an elastic ring. The elastic ring has at least one recess on a surface thereof.