Scroll Compressor Thrust Plate Floating Restriction
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Solution Overview
Problem
In scroll compressors, excessive back-pressure control can lead to excessive pressing force on the tooth top of the wrap, potentially causing seizure or damage.
Innovation Solution
A scroll compressor design incorporating a back-pressure application mechanism and a floating amount restriction mechanism, which applies compressed refrigerant gas to a thrust plate to float the orbiting scroll and restrict its floating amount, preventing excessive force on the wrap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If back-pressure is increased to prevent refrigerant leakage, then sealing performance is improved, but pressing force on the tooth top becomes excessively large causing seizure or damage
Solution Approach 1:
A thrust plate is introduced as an intermediary component between the orbiting scroll and the fixed scroll. The thrust plate receives the thrust load from the orbiting scroll and transmits it to the fixed scroll, thereby mediating the force transmission and preventing excessive pressing force on the tooth top while maintaining effective sealing
2Reliability
If orbiting scroll is allowed to float to maintain constant contact, then sealing is improved, but thrust load causes excessive pressing force on tooth top
Solution Approach 1:
The thrust plate serves as a mediator that supports the thrust load generated during floating operation. It distributes the load away from the tooth top contact area, enabling the orbiting scroll to float for maintaining sealing while preventing tooth top damage from excessive pressing force
3Reliability
If back-pressure application mechanism is added to control floating, then sealing performance is improved, but device complexity increases
Solution Approach 1:
The thrust plate performs multiple functions: it supports the thrust load from the orbiting scroll, transmits force to the fixed scroll, and works with the back-pressure application mechanism to control floating. This multi-functionality allows effective sealing control without proportionally increasing device complexity
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 design effectively prevents excessive pressing force on the tooth top of the wrap, enhancing the reliability of the compressor by controlling back-pressure and reducing the risk of seizure or damage.
Implementation Method 1
the back-pressure application mechanism applies, as back pressure, the refrigerant gas compressed by the scroll compression mechanism to a rear surface of the thrust plate
Data Source
AI summary
A scroll compressor, includes: a scroll compression mechanism including an orbiting scroll, a fixed scroll, and a thrust plate supporting a load of the orbiting scroll in a thrust direction; a back-pressure application mechanism that applies, as back pressure, the refrigerant gas compressed by the scroll compression mechanism to a rear surface of the thrust plate; and a floating amount restriction mechanism that restricts an amount of floating of the thrust plate caused by the back pressure. The floating amount restriction mechanism includes a restriction pin that includes a shaft part and a head part, and locks the thrust plate to the head part to restrict the amount of floating. The shaft part passes through the thrust plate and has a front end part fixed to a front housing, and the head part has a diameter larger than a diameter of the shaft part.