Scroll Compressor Backpressure Relief Groove for Fixed Scroll Stability
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Solution Overview
Problem
The scroll compressor experiences decreased compression efficiency and risk of fixed scroll deformation due to excessive pressure in the backpressure chamber and localized reaction forces from fastening members acting on thin-walled portions, which are more susceptible to deformation.
Innovation Solution
The fixed scroll peripheral wall includes grooves in thick-walled portions to accommodate elastic deformation of the elastic plate, allowing communication between the backpressure chamber and intake passage when a pressure difference exceeds a predetermined value, thereby equalizing pressures and reducing deformation risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the fixed scroll peripheral wall uses thin-walled portions to reduce size, then the scroll compressor becomes smaller, but the thin-walled portions are more susceptible to deformation from localized reaction forces of fastening members
Solution Approach 1:
The fixed scroll peripheral wall is designed with different wall thicknesses in different locations: thin-walled portions for size reduction and thick-walled portions for structural strength. The grooves are specifically formed in the thick-walled portions to accommodate elastic plate deformation, creating local quality variations that simultaneously achieve compact size and adequate strength.
2Reliability
If the backpressure chamber pressure increases to maintain sealing, then sealing performance improves, but compression efficiency decreases and the risk of fixed scroll deformation increases
Solution Approach 1:
The grooves in the thick-walled portions allow the elastic plate to dynamically deform and accommodate pressure differences between the backpressure chamber and intake passage. When pressure difference exceeds a predetermined value, the elastic plate deforms into the grooves, maintaining sealing while allowing pressure equalization to prevent excessive backpressure chamber pressure.
3Reliability
If grooves are formed in thin-walled portions to accommodate elastic plate deformation, then pressure equalization is achieved, but the thin-walled portions become more susceptible to deformation from fastening member reaction forces
Solution Approach 1:
Grooves are strategically formed only in the thick-walled portions of the fixed scroll peripheral wall, not in the thin-walled portions. This local quality differentiation ensures that the grooves provide pressure equalization functionality while the thick-walled portions maintain sufficient strength to resist localized reaction forces from fastening members.
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 enhances compression efficiency by equalizing pressures and prevents deformation of the fixed scroll, ensuring stable orbital motion and improved performance.
Implementation Method 1
an elastic plate having an annular shape, and configured to urge the orbiting scroll toward the fixed scroll
Implementation Method 2
the groove accommodating elastic deformation of the elastic plate so that the backpressure chamber and the intake passage are in communication with each other when a pressure difference between the backpressure chamber and the intake passage exceeds a predetermined value
Data Source
AI summary
A scroll compressor include a housing, a rotary shaft rotatably supported by the housing, a fixed scroll including a fixed scroll base plate, a fixed scroll spiral wall, a fixed scroll peripheral wall, an orbiting scroll including an orbiting scroll base plate, and an orbiting scroll spiral wall, and an elastic plate. The fixed scroll peripheral wall includes a plurality of thick-walled portions spaced from each other in the circumferential direction of the fixed scroll peripheral wall. A groove is formed in at least one of end surfaces of the plurality of thick-walled portions facing the elastic plate, and accommodates elastic deformation of the elastic plate so that a backpressure chamber and an intake passage are in communication with each other when a pressure difference between the backpressure chamber and an intake passage exceeds a predetermined value.