Scroll Compressor Shaft Support Stabilization via Discharge Pressure
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Solution Overview
Problem
Existing scroll compressors face challenges in stabilizing the load acting on the upper surface of the shaft support portion and experience significant energy loss due to friction between the shaft support portion and the fixed scroll portion, leading to unstable operation and reduced efficiency.
Innovation Solution
The implementation of a scroll compressor design that includes a high-pressure space on the outer surface of the closing portion of the shaft support portion, which communicates with the discharge space, and an auxiliary oil supply passage to lubricate the friction surface, stabilizes the load on the shaft support portion and reduces frictional energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shaft support portion slides while in contact with the inner surface of the fixed scroll portion, then the orbiting scroll portion can be supported, but the load on the shaft support portion becomes unstable and frictional energy loss increases
Solution Approach 1:
A high-pressure space is introduced as an intermediary between the shaft support portion and the fixed scroll portion. This high-pressure space acts as a mediator that applies a stable counteracting force to balance the fluctuating load, thereby stabilizing the shaft support portion's operation while reducing frictional energy loss through the auxiliary oil supply passage
2Reliability
If the shaft support portion has a large contact area with the fixed scroll portion, then support stability is improved, but frictional energy loss increases
Solution Approach 1:
The high-pressure space serves as a mediator that provides stable load balancing, allowing the shaft support portion to maintain support stability without requiring a large contact area, thereby reducing frictional energy loss
Solution Approach 2:
The auxiliary oil supply passage introduces hydraulic pressure (oil) to the friction surface between the shaft support portion and fixed scroll portion, reducing frictional energy loss while maintaining support stability through pressure-based lubrication
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 stabilizes the operation of the orbiting scroll portion by minimizing the thrust load and reducing frictional energy loss, enhancing the reliability and efficiency of the scroll compressor.
Implementation Method 1
a high-pressure space formed in an outer surface of a closing portion covering an end portion of the rotating shaft, and on which a discharge pressure acts
Implementation Method 2
since the area of an upper surface of the shaft support portion that makes friction with the inner surface of the fixed scroll portion is large, energy loss due to the friction is also great
Data Source
AI summary
Provided is a scroll compressor including a sealed case, a fixed scroll portion fixed at an inside of the sealed case and provided with a fixed scroll vane, an orbiting scroll portion provided with an orbiting scroll vane that is coupled to the fixed scroll vane, and a rotating shaft formed to allow the orbiting scroll portion to orbit. The orbiting scroll portion is provided at a center thereof with a shaft support portion such that the orbiting scrolling portion is coupled to the rotating shaft. The shaft support portion includes a closing portion provided to cover an end portion of the rotating shaft, and slide while in contact with an inner surface of the fixed scroll portion, and a high-pressure space formed in an outer surface of the closing portion that faces the inner surface of the fixed scroll portion, and on which a discharge pressure acts.