Scroll Compressor Thrust Plate Reduces Wear
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Solution Overview
Problem
In scroll compressors, the surface pressure on the tip of the winding terminal portion of the orbiting scroll's spiral wall increases due to tilting, leading to wear and damage, as efficiency improves and size and weight are reduced.
Innovation Solution
A scroll compressor design featuring an annular thrust plate and thrust sheet with elastic deformation capabilities, along with annular sealing members, to distribute the back pressure load and reduce surface pressure on the winding terminal portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the orbiting scroll is pressed against the fixed scroll with high back pressure load to improve compression efficiency, then compression efficiency is improved, but surface pressure on the winding terminal portion increases causing wear and damage
Solution Approach 1:
A thrust plate is introduced as an intermediary component between the orbiting scroll and the back pressure chamber. The thrust plate distributes the back pressure load over a larger area, preventing concentration of force on the winding terminal portion of the orbiting scroll, thereby reducing surface pressure and wear while maintaining compression efficiency
Solution Approach 2:
The thrust plate is divided into multiple segments or features (such as recesses or protrusions) that correspond to different functional zones. This segmentation allows different regions of the thrust plate to handle different aspects of load distribution, protecting various parts of the orbiting scroll including the vulnerable winding terminal portion
2Productivity
If the orbiting scroll is pressed against the fixed scroll with high back pressure load to improve compression efficiency, then compression efficiency is improved, but the orbiting scroll tilts due to turning moments
Solution Approach 1:
The thrust plate is designed with asymmetric features, including recesses and protrusions positioned at specific locations, to counteract the turning moments that cause tilting. The asymmetric geometry creates counterbalancing forces that offset the centrifugal force-induced tilting, maintaining the orbiting scroll's stability while preserving compression efficiency
3Device complexity
If the back pressure load acts on a limited area to reduce device complexity, then device complexity is reduced, but surface pressure increases causing wear and damage
Solution Approach 1:
The thrust plate incorporates local quality variations through strategically positioned recesses and protrusions. These local structural modifications create zones of different pressure distribution and mechanical properties, allowing the thrust plate to effectively distribute load and protect the winding terminal portion without requiring a complete redesign of the entire back pressure chamber structure
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
The design effectively reduces surface pressure on the winding terminal portion of the orbiting scroll, thereby minimizing wear and damage, while maintaining efficient compression.
Implementation Method 1
an annular sheet member that is provided between the back surface of the orbiting base plate of the orbiting scroll and the plate member, has a diameter substantially equal to the diameter of the plate member, and is capable of being elastically deformed
Data Source
AI summary
To reduce surface pressure acting on a tip of a winding terminal portion of a spiral wall of an orbiting scroll in a scroll compressor. In a scroll compressor 10, a thrust plate 81 and a thrust sheet 82 capable of being elastically deformed are provided between an opposing surface 237 serving as a thrust receiving part and an orbiting base plate 521 of an orbiting scroll 52. A first sealing member 83 seals between the orbiting base plate 521 and the thrust sheet 82 and a second sealing member 84 having a diameter greater than that of the first sealing member 83 seals the opposing surface 237 of a second partition wall 232 and the thrust plate 81. A back pressure chamber H5 is partitioned from a suction pressure area (space H6) by the thrust plate 81, thrust sheet 82, the first sealing member 83, and the second sealing member 84. A circular concave portion 816 is formed on a surface of the thrust plate 81 on the thrust sheet 82 side.