Co-Rotating Scroll Compressor Oil Cooling for Sliding Resistance
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Solution Overview
Problem
Conventional co-rotating scroll compressors face issues with insufficient lubricating oil supply and cooling in the sliding portions, leading to increased sliding resistance and decreased efficiency due to centrifugal force causing lubricating oil accumulation in the outermost peripheral portion of the scroll chamber.
Innovation Solution
A co-rotating scroll compressor design with an oil storage portion in the scroll chamber, a lubricating oil supply passage, and a lubricating oil cooling portion using refrigerant to supply cooled lubricating oil to the sliding portions and bearings, ensuring adequate lubrication and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If lubricating oil is supplied to the sliding portion in a conventional rotary compressor, then lubrication is achieved, but insufficient cooling occurs due to heat capacity limitations and centrifugal force causing oil accumulation in the outermost peripheral portion
Solution Approach 1:
The housing is divided into a scroll chamber and an oil storage chamber separated by a partition wall. The oil storage chamber is specifically designed to collect centrifugally separated lubricating oil at the bottom, while the scroll chamber contains the rotating scroll compression part. This spatial segmentation allows independent optimization of oil storage and compression functions.
Solution Approach 2:
A lubricating oil supply passage acts as an intermediary channel, extending from the oil storage chamber through the partition wall to the scroll chamber and finally to the sliding portion. This passage mediates the transfer of lubricating oil from the storage chamber to the sliding portion, ensuring continuous supply despite centrifugal forces during rotation.
2Productivity
If centrifugal force acts on the rotating scroll compression part, then compression function is achieved, but lubricating oil accumulates in the outermost peripheral portion reducing supply to sliding portion
Solution Approach 1:
The lubricating oil supply passage extracts lubricating oil from the oil storage chamber at the bottom of the scroll chamber and delivers it to the sliding portion. By taking oil out from the centrifugal accumulation zone and transporting it to the sliding portion, the system overcomes the centrifugal separation effect.
Solution Approach 2:
The oil storage chamber collects and stores lubricating oil in advance at the bottom of the scroll chamber, preparing a reservoir of oil before it is needed. This preliminary accumulation ensures that oil is available for continuous supply to the sliding portion during compression operations.
3Quantity of substance
If lubricating oil accumulates in the outermost peripheral portion of the scroll chamber, then centrifugal separation is achieved, but sliding resistance increases due to insufficient oil at the sliding portion
Solution Approach 1:
The lubricating oil supply passage serves as a mediator that transfers lubricating oil from the accumulation zone (outermost peripheral portion) to the sliding portion. This intermediary channel counteracts the harmful effect of centrifugal separation by actively transporting oil to where it is needed.
Solution Approach 2:
The system changes the flow direction and distribution parameters of lubricating oil by utilizing the pressure differential created by centrifugal force. The oil flows from the high-pressure outer peripheral portion through the supply passage to the sliding portion, effectively utilizing the centrifugal parameter change to achieve both accumulation and supply.
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 design effectively suppresses the increase in sliding resistance and maintains efficiency by ensuring sufficient lubricating oil supply and cooling, preventing viscosity decrease and sliding loss.
Implementation Method 1
a lubricating oil cooling portion that cools the lubricating oil in the lubricating oil supply passage with the refrigerant in the storage chamber
Implementation Method 2
due to an influence of centrifugal force of the scroll compression part which rotates, a flow of fluid in the rotational direction is generated, thereby generating centrifugal force. As a result, lubricating oil accumulates in an outermost peripheral portion in the scroll chamber
Data Source
AI summary
A co-rotating scroll compressor includes a housing; a driving mechanism; a driving scroll; a driven scroll; and a driven mechanism. The housing having a scroll chamber in which the driving scroll and the driven scroll are accommodated, a storage chamber that separates refrigerant drawn from an outside into gas and liquid and stores liquid refrigerant, and a partition wall that separates the storage chamber from the scroll chamber. The co-rotating scroll compressor includes a scroll compression part formed of the driving scroll and the driven scroll, an oil storage portion provided in the scroll chamber, and a lubricating oil supply passage through which the lubricating oil is supplied to the scroll compression part or a bearing. The lubricating oil supply passage has a lubricating oil cooling portion that cools the lubricating oil in the lubricating oil supply passage with the refrigerant in the storage chamber.