Scroll Compressor Arcuate Clearance Design
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Solution Overview
Problem
In scroll compressors, the thermal expansion of arcuate portions leads to positional deviations of seal points, causing refrigerant leaks and reduced compression performance, especially when using high-temperature refrigerants.
Innovation Solution
The design includes a fixed and movable scroll with arcuate portions having a smaller radius of curvature than the spiral portions, with the arcuate portion side surface clearance being at least 1.2 times larger than the spiral portion clearance, and the thickness of the arcuate portions being at least 1.2 times greater than the spiral portions, to accommodate thermal expansion and reduce positional deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the arcuate portion side surface clearance is made larger to accommodate thermal expansion, then positional deviation of seal points is reduced, but the clearance between scroll wraps increases which may affect compression efficiency
Solution Approach 1:
The patent applies different clearance values to different regions of the scroll wrap. Specifically, the arcuate portion side surface clearance is set larger than the spiral portion side surface clearance. This local differentiation allows the arcuate portion to accommodate thermal expansion while maintaining tighter clearances in the spiral portion to preserve compression efficiency.
2Stability of the object's composition
If the thickness of the arcuate portion is increased to accommodate thermal expansion, then the structural stability improves, but the manufacturing complexity and material usage increase
Solution Approach 1:
The patent specifies that the thickness of the arcuate portion is greater than the thickness of the spiral portion. This local thickening provides the necessary structural stability to accommodate thermal expansion in the arcuate region without increasing the thickness of the entire scroll wrap, thereby minimizing manufacturing complexity and material usage.
3Productivity
If the arcuate portion is designed with smaller radius of curvature to improve compression ratio, then the compression performance improves, but the thermal expansion causes greater positional deviation
Solution Approach 1:
The patent changes the clearance parameter specifically for the arcuate portion side surface, making it larger than the spiral portion side surface clearance. This parameter adjustment compensates for the positional deviation caused by thermal expansion in the arcuate portion with smaller radius of curvature, while maintaining the compression ratio benefits.
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 effectively suppresses positional deviations of the scroll wraps, thereby reducing degradation in compression performance and maintaining efficiency even with high-temperature refrigerants.
Implementation Method 1
such an arcuate portion thermally expands to cause positional deviation of a seal point
Data Source
AI summary
A fixed scroll wrap (52) includes a fixed spiral portion (57) having a spiral shape and a fixed arcuate portion (58) having an arcuate shape. A movable scroll wrap (62) includes a movable spiral portion (67) having a spiral shape and a movable arcuate portion (68) having an arcuate shape. An arcuate portion side surface clearance (GA) is defined by the fixed arcuate portion (58) and one of the movable spiral portion (67) and the movable arcuate portion (68), or is defined by the movable arcuate portion (68) and one of the fixed spiral portion (57) and the fixed arcuate portion (58). A spiral portion side surface clearance (GI) is defined by the fixed spiral portion (57) and the movable spiral portion (67). The arcuate portion side surface clearance (GA) is larger than the spiral portion side surface clearance (GI).