Scroll Compressor Resin Rubber Sealing Member
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Solution Overview
Problem
Existing scroll compressors face issues with refrigerant leakage due to inadequate sealing and excessive mechanical loss caused by the use of metal sealing members, which result in increased sliding resistance and wear.
Innovation Solution
A scroll compressor design incorporating an annular sealing member with a rubber portion that elastically deforms and a resin portion, where the resin portion projects out to contact the opposing wall, reducing friction and enhancing sealing, thereby minimizing refrigerant leakage and mechanical loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal sealing member is used to seal the back pressure chamber, then the sealing function is improved, but the sliding resistance and mechanical loss increase
Solution Approach 1:
The sealing member is constructed as a composite structure with a metal base plate providing structural support and a resin portion providing low-friction sealing. This combination allows the sealing member to maintain both sealing effectiveness and low sliding resistance, resolving the contradiction between reliability and energy loss.
Solution Approach 2:
Different portions of the sealing member have different material properties: the metal base plate provides strength and structural integrity, while the resin portion provides low-friction contact with the opposing wall. This local differentiation of material qualities allows simultaneous achievement of sealing function and reduced mechanical loss.
2Reliability
If the urging force is increased to enhance sealing, then the sealing performance is improved, but the sliding resistance increases
Solution Approach 1:
The invention changes the material parameter of the sealing surface from metal to resin, which has a lower coefficient of friction. This parameter change allows the sealing member to maintain adequate sealing performance with reduced urging force, thereby reducing sliding resistance and mechanical loss.
3Strength
If a metal sealing member is used, then the structural strength is improved, but the refrigerant leakage increases
Solution Approach 1:
The composite structure combines the structural strength of metal with the sealing properties of resin. The metal base plate maintains structural integrity while the resin portion creates an effective seal that prevents refrigerant leakage, resolving the contradiction between strength and leakage prevention.
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 effectively restricts refrigerant leakage and reduces mechanical loss by controlling the urging force of the movable scroll against the fixed scroll, using a resilient rubber portion and a harder resin portion to maintain sealing without excessive pressure, thus improving operational efficiency.
Implementation Method 1
a rubber portion (53), which elastically deforms in the groove (50)
Implementation Method 2
a back pressure in the back pressure region urges the movable scroll toward the fixed scroll
Data Source
AI summary
A scroll compressor includes a housing, a fixed scroll, and a movable scroll. A compression chamber is formed between the movable scroll and the fixed scroll. An opposing wall is located in and fixed to the housing. A back pressure region is formed between the opposing wall and the movable scroll, and a back pressure in the back pressure region urges the movable scroll toward the fixed scroll. An annular sealing member is arranged between the movable scroll and the opposing wall. The movable scroll includes a holding portion that holds the sealing member. The sealing member includes a rubber portion, which elastically deforms in the holding portion, and a resin portion, which is made of a material harder than the rubber portion. The resin portion at least partially projects out of the holding portion toward the opposing wall. The resin portion is in contact with the opposing wall.