Scroll Compressor Frame Groove for Axial Clearance Control
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Solution Overview
Problem
In scroll compressors, excessive axial clearance between the revolving and fixed scrolls leads to increased sliding resistance and potential operation failures, while insufficient clearance results in fluid leakage, and frame deformation due to welding or press fit affects the axial clearance, causing performance deterioration.
Innovation Solution
A scroll compressor design with a frame that includes a first welded point for fixation and a frame outer peripheral groove between the revolving-scroll-receiving surface and the welded point, which localizes deformation and maintains appropriate axial clearance, reducing the risk of leakage and operation failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the axial clearance between the revolving scroll and the fixed scroll is minimized to prevent fluid leakage, then compressor performance is improved, but the revolving scroll may be excessively pressed against the fixed scroll causing operation failure
Solution Approach 1:
The frame is designed with differentiated structural properties: the compression mechanism section has high rigidity to maintain precise axial clearance between scrolls, while the drive mechanism section has lower rigidity to absorb thermal expansion and deformation, preventing excessive pressing force on the revolving scroll
2Manufacturing precision
If the frame is fixed to the sealed container by press fit to suppress deformation, then the fixed-scroll-fastening surface deformation is reduced, but the frame outer periphery deformation occurs
Solution Approach 1:
The press fit fixation is extracted from the compression mechanism section and relocated to the drive mechanism section, separating the functions of precision maintenance and deformation absorption. The compression mechanism section is extracted from the deformation constraint, allowing it to maintain precise dimensions without experiencing fixation-induced deformation
3Strength
If the frame is fixed to the sealed container by welding to ensure strong fixation, then fixation strength is improved, but the inner periphery of the frame deforms causing performance deterioration
Solution Approach 1:
The welding fixation is extracted from the compression mechanism section and applied only to the drive mechanism section. This separates the precision-critical compression area from the fixation process, eliminating welding-induced deformation in the scroll clearance zone while maintaining strong overall fixation
Solution Approach 2:
The frame is segmented into two functional zones with different fixation methods: the compression mechanism section uses precision machining without fixation to maintain scroll clearance, while the drive mechanism section uses welding for strong fixation, allowing each zone to be optimized independently
4Ease of operation
If the axial clearance between scrolls is increased to prevent excessive pressing, then the revolving scroll operation is maintained, but fluid leakage in the compression chamber increases
Solution Approach 1:
The frame's rigidity parameter is changed spatially: high rigidity in the compression mechanism section maintains precise axial clearance (small gap) for preventing leakage, while lower rigidity in the drive mechanism section allows for thermal expansion and deformation accommodation, maintaining operating clearance under varying conditions
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 improves the reliability and performance of the scroll compressor by maintaining optimal axial clearance and minimizing deformation, thus preventing excessive sliding friction and fluid leakage, even with refrigerants of small density like R32.
Implementation Method 1
fixation to the sealed container is made by press fit or welding
Implementation Method 2
deformation due to loads or heat occurs in the frame
Implementation Method 3
fixation to the sealed container is made by press fit or welding
Implementation Method 4
deformation due to loads or heat occurs in the frame
Implementation Method 5
a frame outer peripheral groove is provided in an outer periphery of the frame facing an inner periphery of the sealed container and between the revolving-scroll-receiving surface and the first welded point
Data Source
AI summary
A scroll compressor has a sealed container inside which a working fluid is sealed; a frame fixed inside the sealed container; a fixed scroll provided with a fixed-side spiral body formed in a spiral shape on a fixed-side base plate fixed inside the sealed container; and a revolving scroll in which a revolving-side spiral body meshing with the fixed-side spiral body is provided on a revolving-side base plate. The frame includes a first welded point at which the frame is fixed by welding to the sealed container, and a revolving-scroll-receiving surface supports a bottom surface of the revolving-side base plate opposite to a surface thereof on which the revolving-side spiral body is provided. A frame outer peripheral groove provided in an outer periphery of the frame faces an inner periphery of the sealed container between the revolving-scroll-receiving surface and the first welded point.