Scroll Compressor Boss Coupling Reduces Eccentric Load
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Solution Overview
Problem
In scroll compressors, the eccentric load on the crank shaft due to a height difference between the point of support and the point of operation leads to increased bearing load, frictional loss, noise, and reduced reliability, along with higher material costs and motor lamination height limitations.
Innovation Solution
The introduction of a boss coupling recess eccentric to the central axis with a self-lubricative bush bearing, press-fit to the boss portion of the orbiting scroll, reduces the eccentric load on the crank shaft, minimizes friction loss, and eliminates the need for a pocket recess in the main frame, thereby reducing material costs and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pocket recess is formed in the main frame to support the crank shaft, then the crank shaft can be supported, but the height difference between support point and operation point increases eccentric load
Solution Approach 1:
The patent introduces a boss coupling recess as an intermediary structure that directly couples the orbiting scroll to the crank shaft. This eliminates the need for the pocket recess in the main frame and reduces the height difference between support and operation points, thereby reducing eccentric load while maintaining support stability
Solution Approach 2:
The patent changes the structural arrangement from a vertical support configuration (with height difference) to a horizontal coupling configuration (boss coupling recess). This dimensional change eliminates the height difference between support point and operation point, reducing eccentric load on the crank shaft
2Stability of the object's composition
If the orbiting scroll is supported by the main frame with a pocket recess, then the structure is stable, but the main frame length increases the axial length of the compressor
Solution Approach 1:
The patent extracts the support function from the main frame by directly coupling the orbiting scroll to the crank shaft through the boss coupling recess. This eliminates the need for the pocket recess in the main frame, reducing the main frame length and consequently the axial length of the compressor while maintaining structural stability
Solution Approach 2:
The patent merges the support function and the driving function by directly coupling the orbiting scroll to the crank shaft. This integration eliminates the need for separate support structures (pocket recess), reducing the overall axial length while maintaining stability
3Force
If a bush bearing is installed in the boss portion, then the eccentric load is reduced, but friction loss increases without self-lubrication
Solution Approach 1:
The patent applies a self-lubricative material to the bush bearing, enabling it to reduce friction loss through its own inherent lubrication properties without requiring external lubrication systems. This self-service approach maintains the eccentric load reduction benefit while eliminating the friction penalty
Solution Approach 2:
The patent uses composite materials for the bush bearing, combining structural materials with self-lubricative materials. This composite structure provides both the mechanical strength needed to support the reduced eccentric load and the self-lubricating properties needed to minimize frictional energy loss
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 reduces the eccentric load on the crank shaft, enhances compression efficiency, decreases noise, and lowers material costs, while increasing the lamination height of the motor by minimizing the axial length of the compressor.
Implementation Method 1
A lubricating oil feed path is provided for supplying lubricating oil to a slide part of the compression part
Data Source
AI summary
In a scroll compressor the present invention, a boss portion of an orbiting scroll is inserted to be coupled to a boss coupling recess of a crank shaft, and thus, friction loss of the bearing portion is reduced, enhancing compression efficiency and reliability and reducing noise and material costs Also, a bush bearing is coated to be formed on the boss portion of the orbiting scroll, a thickness of a bearing portion may be reduced. Also, since an outer circumferential surface of the bearing portion is in contact with an inner circumferential surface of the boss coupling recess, damage to the bearing portion may be prevented.