Rotary Compressor Vane Oil Communication for Friction Reduction
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Solution Overview
Problem
Conventional rotary compressors experience refrigerant leakage between the roller and vane, leading to performance degradation, increased frictional resistance, and wear, which shortens the lifespan of components due to thermal expansion and sliding loss.
Innovation Solution
A rotary compressor design featuring a communication part between the vane slot and oil space, with an oil supply groove and sidewall path to selectively allow oil communication and cooling, reducing friction and thermal expansion by maintaining vane temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a combined vane-roller structure is used to prevent refrigerant leakage, then sealing performance is improved, but frictional resistance between the vane and vane slot increases due to circumferential force bias
Solution Approach 1:
A communication part is introduced as an intermediary element between the vane slot and the oil-filled space. This communication part includes an oil supply groove that selectively communicates with the vane slot, allowing oil to be supplied to the contact area between the vane and vane slot. The oil acts as a lubricant mediator, reducing frictional resistance while maintaining the sealing function of the combined vane-roller structure.
2Power
If the vane moves linearly in the vane slot under circumferential force, then compression function is maintained, but thermal expansion of the vane increases due to sliding loss
Solution Approach 1:
The communication part serves as a mediator to introduce oil into the vane slot area. The oil supply groove within the communication part selectively allows oil to reach the contact interface between the vane and vane slot. This oil intermediary cools the vane by removing heat generated during sliding, thereby reducing thermal expansion while preserving the compression function.
Solution Approach 2:
The selective communication feature of the communication part changes the physical state of the system by introducing a lubricating fluid (oil) into the contact area. This parameter change (from dry sliding to lubricated sliding) reduces friction and associated thermal generation, thereby controlling vane temperature and thermal expansion during the compression cycle.
3Temperature
If the communication part selectively communicates between vane slot and oil space, then cooling efficiency is improved, but device complexity increases
Solution Approach 1:
The communication part is merged with the vane structure itself. The oil supply groove is formed as an integral feature of the vane, combining the cooling function with the existing vane component. This merging approach provides effective cooling while minimizing additional structural complexity, as the communication part does not require separate mounting or complex assembly mechanisms.
Data Source
AI summary
A rotary compressor is disclosed. The rotary compressor includes a sidewall path formed in an inner wall of a cylinder facing a vane slot and configured to form a space facing a side surface of a vane, and the vane is provided with a communication part configured to selectively communicate between the outside of the vane slot and the sidewall path according to a position of the vane.