Scroll Compressor Anti-Rotation Ring Structure for Tilt Prevention
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Solution Overview
Problem
Conventional anti-rotation mechanisms in scroll compressors face issues with ring tilting due to protrusion from recesses, leading to vibration and wear, as the rings can move axially and tilt within the clearance, causing unstable orientation and contact with thrust plates.
Innovation Solution
The design incorporates ring mating portions with a retreat portion on the inner circumferential surface of the rings, positioned to prevent tilting by setting the force transmission point away from the ring end face, using a clearance fit with anti-rotation pins to maintain stable linear contact and prevent axial displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rings are fitted in recesses with a clearance fit to eliminate press-fit deformation, then the risk of deformation of the movable scroll or housing is eliminated, but the rings can move axially and tilt within the clearance, causing vibration and wear
Solution Approach 1:
The invention introduces a new dimensional constraint by adding a protrusion on the ring that engages with a corresponding recess in the movable scroll. This protrusion-recess engagement adds a radial dimension constraint to the existing axial clearance fit, preventing the ring from tilting and moving axially while maintaining the clearance fit benefits.
Solution Approach 2:
The protrusion on the ring acts as an intermediary element that mediates between the ring and the movable scroll. This protrusion transfers the anti-rotation function from direct pin-ring contact to protrusion-movable scroll contact, stabilizing the ring's orientation while maintaining the clearance fit between the ring and the stationary recess.
2Length of moving object
If the length of rings is greater than the depth of recesses, then the near-side end faces of the rings protrude from the retreat face, but this causes the rings to tilt within the clearance, leading to unstable orientation and contact with thrust plates
Solution Approach 1:
The protrusion on the ring extends in the radial direction from the ring's inner circumferential surface. This radial extension provides a new dimensional constraint that prevents the ring from tilting axially within the clearance, stabilizing the ring's orientation even when the ring length exceeds the recess depth.
Solution Approach 2:
The protrusion-recess engagement mechanism provides preliminary anti-action by preventing the ring from tilting and moving axially before these movements can cause instability or contact with thrust plates. The protrusion预先 (in advance) constrains the ring's position, preventing the harmful tilting motion.
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 prevents ring tilting, reducing vibration and wear, ensuring stable operation and minimizing noise and contact pressure, thereby enhancing the reliability and performance of the scroll compressor.
Implementation Method 1
the rings are mated in the recesses without being press-fit, so it is possible to eliminate the risk of deformation of the movable scroll or the housing which would be caused by a press-fit. While one side of the pin is press-fit into the housing, the other side engages with the ring, so the pin receives a load from the ring as a 'cantilever'.
Data Source
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AI summary
[Problem] To prevent a phenomenon of tilting of a ring with respect to a ring fitting portion of a rotation prevention mechanism. [Solution] A scroll compressor (10) comprises a rotation prevention mechanism (120) that prevents rotation of a movable scroll (80). The movable scroll (80) has an opposing surface (81b) that faces a flat surface (31a) of a partition member (30). The opposing surface (81b) has an annular sliding surface (111) capable of sliding on the flat surface (31a), and a retracted surface (112) on a radially inner side of the sliding surface (111). The rotation prevention mechanism (120) comprises: a ring fitting portion (130) recessed from the retracted surface (112); a ring (140) that is clearance-fitted in the ring fitting portion (130); and a rotation prevention pin (150) extending from the partition member (30) into the ring (140). The ring (140) has, on the second end surface (143) side of the inner circumferential surface (144), a retracted portion (145) that does not contact the pin (150).