Scroll Compressor Back Pressure Sealing and Oil Supply
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Solution Overview
Problem
Conventional low-pressure scroll compressors face challenges in maintaining effective sealing of the back pressure chamber due to the shaking of back pressure seal members during the orbiting motion, leading to reduced sealing ability and efficiency, and the manufacturing and assembly of screw-shaped oil supply passages are complex and prone to defects.
Innovation Solution
The design incorporates a scroll compressor with a housing, orbiting and fixed scrolls, a driving motor, and multiple seal members and anti-rotation rings to enhance sealing, along with an oil supply passage system that includes an orifice pin to improve oil supply and reduce pressure, simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a back pressure seal member is provided in the orbiting scroll to seal the gap between the orbiting scroll and the intermediate housing, then the sealing of the back pressure chamber is improved, but the seal member shakes due to the revolving motion of the orbiting scroll, reducing sealing ability
Solution Approach 1:
The back pressure seal member is extracted from the orbiting scroll and relocated to the intermediate housing. This separates the seal member from the revolving component, eliminating the shaking problem while maintaining the sealing function of the back pressure chamber.
Solution Approach 2:
The seal member is pre-positioned in the intermediate housing at the location where it is needed for sealing, rather than being attached to the moving orbiting scroll. This preliminary positioning ensures stable sealing without subjecting the seal member to centrifugal forces and shaking during operation.
2Productivity
If a screw-shaped flow path is provided in the oil supply passage, then oil can be supplied to the back pressure chamber, but the manufacturing and assembly become complex and prone to defects
Solution Approach 1:
The oil supply passage is segmented into multiple straight or simple curved sections rather than a single complex screw-shaped path. This segmentation allows each section to be manufactured independently with simpler processes, reducing overall manufacturing complexity and assembly difficulties while achieving the same oil supply function.
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 improves the sealing of the back pressure chamber, maintains efficient oil supply, and simplifies the manufacturing process by reducing the complexity of the oil supply passage, enhancing the overall performance and reliability of the scroll compressor.
Implementation Method 1
a first back pressure seal member disposed in the intermediate housing to surround a periphery of the back pressure chamber and seal a gap between the orbiting scroll and the intermediate housing
Implementation Method 2
a second back pressure seal member disposed in the intermediate housing at one end of the back pressure chamber and seal a gap between the rotary shaft and the intermediate housing
Implementation Method 3
a plurality of anti-rotation rings disposed in the intermediate housing at an outer side of the first back pressure seal member; and a plurality of anti-rotation pins provided in the orbiting scroll and inserted into the plurality of anti-rotation rings
Implementation Method 4
an orbiting scroll orbited by the driving motor, a fixed scroll disposed in the housing and forming a compression chamber together with the orbiting scroll
Implementation Method 5
an oil separator provided in the housing at one sale of the fixed scroll and configured to separate oil from the refrigerant discharged from the fixed scroll
Data Source
AI summary
A scroll compressor is provided which comprises: a housing; a driving motor; an orbiting scroll rotated by the driving motor; a fixed scroll; a suction port provided in the housing and suctioning a refrigerant; an oil separator in the housing at one side of the fixed scroll; and a discharge port for discharging, to the outside of the housing, the refrigerant from which oil is separated in the oil separator. The scroll compressor includes an intermediate housing; a back pressure chamber in the intermediate housing at one side of the orbiting scroll, first and second back pressure seal members in the intermediate housing; a plurality of anti-rotation rings in the intermediate housing; and a plurality of anti-rotation pins at the orbiting scroll to be inserted into each of the plurality of anti-rotation rings.