Scroll Compressor Oldham Ring Key Protrusion Design
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Solution Overview
Problem
The existing scroll compressors with Oldham rings face issues of increased overall height and potential damage due to increased pressure, leading to limitations in compression ratio and vibration/noise problems.
Innovation Solution
The design includes a scroll compressor with an Oldham ring where the second keys temporarily protrude from their recesses during orbiting, maximizing contact area at the start of discharging to reduce pressure and minimize abrasion, and the Oldham ring is integrated with a stepped portion to reduce its height and space occupation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the rotation shaft extends up to the orbiting wrap to apply repulsive force and reaction force at the same point, then the orbiting scroll inclination is reduced, but the moment transferred to the Oldham ring increases causing key damage and abrasion
Solution Approach 1:
The patent applies local quality by creating an asymmetric key recess configuration where the first key recess has a greater depth than the second key recess. This local differentiation allows the first key to engage deeper into the Oldham ring, providing enhanced support and load distribution at the critical location where the moment is transferred, thereby reducing key damage and abrasion while maintaining the orbiting scroll's stability
2Stability of the object's composition
If the Oldham ring is disposed between the fixed scroll and the orbiting scroll to prevent rotation, then the orbiting scroll is constrained, but the overall height of the scroll compressor increases
Solution Approach 1:
The patent applies dimensionality change by transitioning the Oldham ring from a traditional horizontal configuration to a vertical configuration. The ring is positioned between the fixed scroll and orbiting scroll in the vertical direction, with keys extending vertically into key recesses. This vertical arrangement prevents orbiting scroll rotation while minimizing the horizontal space occupied, thereby reducing the overall compressor footprint
3Reliability
If the second keys temporarily protrude from the second key recesses during orbiting, then the contact area is maximized at discharging start, but the key recess design becomes more complex
Solution Approach 1:
The patent applies dynamics by designing the second key recesses with a specific geometric configuration that allows the second keys to dynamically protrude during the orbiting motion. The key recesses are shaped to provide minimal engagement during suction and compression phases, then maximize contact area at the critical discharging start moment when pressure is highest. This dynamic engagement pattern optimizes pressure distribution and reduces abrasion without requiring additional components
Data Source
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AI summary
A scroll compressor is provided. The scroll compressor may include a fixed scroll having a fixed wrap and a plurality of first key recesses, an orbiting scroll engaged with the fixed scroll to define a compression chambers and having an orbiting wrap and a plurality of second key recesses, the orbiting scroll performing an orbiting motion with respect to the fixed scroll, a drive having a rotation shaft coupled to the orbiting scroll such that one end portion thereof overlaps the orbiting wrap in a lateral direction, and an Oldham ring having a plurality of first and second keys coupled to the plurality of first key recesses and the plurality of second key recesses, respectively. The plurality of second keys may at least temporarily protrude from the plurality of second key recesses in a radial direction during the orbiting motion. Further, the plurality of second key recesses and the plurality of second keys may be disposed to obtain maximum contact areas therebetween at a moment of start of discharging.