Scroll Compressor Crankshaft Oil Passage Design for Thrust Wear
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Solution Overview
Problem
Current lubricating oil supply systems for scroll compressors fail to provide stable and sufficient lubrication to the thrust surface, leading to wear and potential failure during high-speed operation.
Innovation Solution
A lubricating oil supply system that utilizes specially designed upper counterweights and oil passages on the crankshaft to transport lubricating oil to the thrust surface using centrifugal force, ensuring effective lubrication and preventing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional lubricating oil supply system is used, then the structure is simple, but the lubrication of the thrust surface is insufficient during high-speed operation
Solution Approach 1:
The lubricating oil supply system is segmented into multiple independent oil passages (P1, P2, P3, P4, P5, P6) distributed at different locations on the crankshaft, allowing oil to be delivered to multiple thrust surface contact points simultaneously. This segmentation ensures comprehensive lubrication coverage without requiring a single complex supply mechanism.
Solution Approach 2:
The oil passages are pre-configured in the crankshaft structure with oil outlets positioned to deliver lubricating oil directly to the thrust surface contact points before wear occurs. The oil supply path is established in advance through the crankshaft's internal passages, ensuring immediate lubrication when the compressor operates.
2Productivity
If the scroll compressor operates at high speed, then the productivity increases, but the wear of the thrust surface accelerates
Solution Approach 1:
The crankshaft structure itself serves as the lubricating oil supply system, with oil passages integrated directly into the crankshaft body. The rotating crankshaft automatically delivers lubricating oil to the thrust surface contact points through its internal passages and external oil outlets, providing self-service lubrication that scales with operating speed without requiring additional external lubrication mechanisms.
3Reliability
If the lubricating oil supply passages are designed on the crankshaft, then the oil supply stability improves, but the manufacturing complexity increases
Solution Approach 1:
The lubricating oil supply passages are merged with the crankshaft structure, combining the functions of the crankshaft (power transmission) and the oil supply system into a single integrated component. The oil passages P1-P6 are formed as integral parts of the crankshaft, eliminating the need for separate oil supply components and reducing the number of assembly steps.
Solution Approach 2:
The crankshaft is designed with multi-functionality, serving both as the power transmission component and as the lubricating oil supply system. The same crankshaft structure that transmits rotational motion also contains the oil passages and outlets that deliver lubricating oil to the thrust surface, reducing the overall component count and simplifying the overall system architecture.
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 system effectively prevents wear on the thrust surface and enhances the reliability of the scroll compressor during high-speed operation, making it suitable for engineering applications.
Implementation Method 1
the lubricating oil can reach the thrust surface of the housing through the wall surface of the upper counterweight by the action of centrifugal force
Data Source
AI summary
The present disclosure relates to a scroll compressor and its lubricating oil supply system. The lubricating oil supply system includes: an oil passage P1 formed by a core hole extending longitudinally through the crankshaft; an oil pump, whose oil suction port is immersed in the lubricating oil in the oil pool, and the oil outlet is connected to the oil circuit P1; an oil passage P3 located in the gap between the upper end surface of the crankshaft and the lower surface of the orbiting scroll; an oil passage P4 formed by a longitudinal hole in the crankshaft, the longitudinal hole extending downwards from the upper end surface of the crankshaft; an oil passage P5 formed by a transverse hole in the crankshaft and a gap between the lower edge of the hub of the orbiting scroll and the upper surface of the upper counterweight, the transverse hole extending transversely from the outer peripheral surface of the upper end of the crankshaft to communicate with the longitudinal hole, the opening of the transverse hole on the outer peripheral surface of the upper end of the crankshaft is aligned with the gap between the lower edge of the hub and the upper surface of the upper counterweight; an oil passage P6 formed by the gap between the outer peripheral surface of the hub and the upright wall of the upper counterweight, and the gap between the outer peripheral surface of the hub and the inner peripheral surface of the center hole of the housing; and an oil passage P2 formed by an oil return pipe so that the lubricating oil circulates.