Compressor Endplate Through-Hole Layout for Sliding Surface Flatness
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Solution Overview
Problem
In compressors, the stress generated by welding or shrink fitting between the main body container and the end plate causes deformation of the recess portion, leading to increased resistance on the sliding surface due to distortion.
Innovation Solution
The compressor design includes a center portion with a shaft hole, an outer peripheral portion joined to the main body container, connection portions, and through holes between adjacent connection portions, forming a fan-shaped region with continuous through holes in the circumferential direction to prevent stress transmission to the recess portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the outer periphery of the end plate is joined to the inner periphery of the main body container by welding or shrink fitting, then the structural integrity and sealing of the compressor is improved, but stress is transmitted to the recess portion causing deformation and distortion on the sliding surface
Solution Approach 1:
The end plate is divided into a center portion (containing the recess portion and sliding surface) and an outer peripheral portion (containing the joining area), connected by connection portions. This segmentation isolates the recess portion from stress transmitted during joining of the outer periphery to the main body container, preventing deformation while maintaining structural integrity.
2Volume of moving object
If the distance between the outer periphery of the end plate and the recess portion is reduced to minimize the compressor size, then the compactness and portability is improved, but stress transmission to the recess portion increases causing easier deformation
Solution Approach 1:
By segmenting the end plate into distinct center and outer peripheral portions connected by connection portions, the design allows compact dimensions while preventing stress transmission to the recess portion. The connection portions act as stress isolation elements, enabling small compressor size without compromising recess portion stability.
3Adaptability or versatility
If the recess portion is made with lower rigidity to accommodate the discharge hole and reed valve, then the functionality for fluid discharge is improved, but the susceptibility to deformation under stress increases
Solution Approach 1:
The end plate is segmented to isolate the low-rigidity recess portion (necessary for discharge functionality) from the high-stress outer peripheral joining area. The connection portions transmit loads away from the recess portion, allowing it to maintain low rigidity for functional requirements while being protected from deformation-causing stresses.
Solution Approach 2:
The connection portions serve as intermediary elements between the outer peripheral portion and the center portion containing the recess. These intermediaries transmit and distribute stresses, preventing direct stress transmission to the vulnerable recess portion while maintaining structural continuity and load-bearing capability.
Data Source
AI summary
An end plate includes a plurality of connection portions coupling a center portion and an outer peripheral portion, and a plurality of through holes formed between the connection portions. The center portion includes a recess portion having a discharge hole, and a fixing hole through which a fixing member for fixing a reed valve to the end plate passes. In a fan-shaped region surrounded by a first half line starting from a center of a shaft hole and passing through a center of the discharge hole, a second half line starting from the center of the shaft hole and passing through a center of the fixing hole, and an outer peripheral surface, the through hole is formed to be continuous in a circumferential direction of the fan-shaped region, and both ends of the through hole in the circumferential direction of the fan-shaped region are located outside the fan-shaped region.