Scroll Compressor Oldham Ring Reinforcement and Chuck Clearance
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Solution Overview
Problem
The existing scroll type compressors face issues with the strength of the Oldham's ring fixing locking pawl, which is prone to breaking, and the processing efficiency is compromised due to obstruction from the escape portion during chuck fixation, leading to reduced accuracy and efficiency in machining operations.
Innovation Solution
The scroll type compressor design includes a reinforced fixing locking pawl with a pedestal-like reinforcing portion and a concave escape portion on the movable scroll's mirror plate, allowing for enhanced strength and reduced edge cut-outs to accommodate a three-point chuck, ensuring secure chucking and improved processing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the fixing locking pawl is made longer to extend beyond the movable scroll for fitting to the fixed scroll, then the positioning precision between fixed scroll and movable scroll is improved, but the strength of the fixing locking pawl is reduced making it prone to breaking
Solution Approach 1:
The fixing locking pawl is divided into two functional segments: a long extending portion for positioning and fitting to the fixed scroll, and a reinforced base portion with increased thickness for strength. This segmentation allows each part to optimize its function without compromising the other.
Solution Approach 2:
The base portion of the fixing locking pawl is given different local quality (increased thickness) compared to the extending portion. This local reinforcement provides the necessary strength at the critical stress point while maintaining the long length needed for positioning precision.
2Strength
If the escape portion is provided on the movable scroll to avoid the fixing locking pawl, then the strength of the fixing locking pawl is improved, but the processing efficiency is reduced due to obstruction during chuck fixation
Solution Approach 1:
The escape portion is designed as a concave-shaped notch that extends in the circumferential direction, creating additional dimensional space. This allows the three-point chuck to be positioned at three points displaced by 120° that are not blocked by the escape portion, enabling efficient machining operations.
Solution Approach 2:
The concave escape portion is pre-formed on the movable scroll to anticipate and accommodate the chuck fixation process. By preparing this escape route in advance, the design enables smooth chuck attachment without interference from the fixing locking pawl or other structural elements.
3Ease of operation
If the three-point chuck is secured to the outer periphery of the mirror plate avoiding the guide grooves, then the guide function is maintained, but the processing accuracy is reduced because any gripping point invades the escape portion
Solution Approach 1:
The concave escape portion creates an asymmetric configuration on the movable scroll that provides three specific gripping points for the chuck that are not blocked by the escape portion or guide grooves. These three points are displaced by 120° from each other, enabling accurate and efficient machining operations.
Data Source
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AI summary
In a scroll type compressor (1) including a fixed scroll (23) having a mirror plate (23A) and a lap (23B) provided to the mirror plate, a movable scroll (25) having a mirror plate (25A, 125A) and a lap (25B, 125B) that is provided to the mirror plate (25A, 125A) and engaged with the fixed scroll, and an Oldham's ring (61) that is disposed on the back side of the movable scroll and constrains rotation of the movable scroll on the axis thereof, the Oldham' s ring has a pair of fixing locking pawls (85) extending from the back side of the movable scroll and fitted to the fixed scroll, each of the fixing locking pawls is provided with a reinforcing portion (85A) at the base portion thereof, and the mirror plate of the movable scroll is cut out in a concave shape at the edge portion thereof in conformity with a movement range of the reinforcing portion to form a concaved escape portion (91, 191) at the edge portion of the mirror plate.