Scroll Compressor Back-Pressure Chamber Tilt Control
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Solution Overview
Problem
In scroll compressors, once the orbiting scroll tilts due to differential pressure fluctuations, it is difficult to quickly restore normal operation as fluid leaks through widened gaps, leading to excessive time for pressure equalization and increased separation forces.
Innovation Solution
The implementation of an auxiliary introduction mechanism that supplies fluid to the back-pressure chamber before the introduction mechanism, using a check valve to maintain pressure and reduce tilt, along with overlapping supply periods to ensure continuous high-pressure fluid delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the orbiting scroll tilts due to differential pressure fluctuations, then the gap of the thrust surface widens, but fluid leaks from the back-pressure chamber into the suction side, making it difficult to restore normal operation
Solution Approach 1:
The patent introduces a back-pressure chamber that is pre-configured to receive fluid from the compression chamber. When the orbiting scroll tilts, this pre-established pressure chamber provides immediate counter-pressure to restore the scroll to its correct position, preventing the widening of thrust surface gaps and fluid leakage. The back-pressure chamber acts as a preliminary protective mechanism against tilt-induced failures.
Solution Approach 2:
The back-pressure chamber serves as an intermediary element between the compression chamber and the suction side. It mediates the pressure fluctuations by providing a controlled intermediate pressure zone that prevents direct communication between high-pressure and low-pressure regions when the orbiting scroll tilts, thereby stopping fluid leakage through widened gaps.
2Reliability
If the orbiting scroll tilts, then a gap is created between end faces of wraps and end plates, but high-pressure fluid leaks toward the suction port, causing excessive compression and pressure rise
Solution Approach 1:
The back-pressure chamber acts as an intermediary pressure zone that prevents direct leakage paths between the compression chamber and suction port. When the orbiting scroll tilts and creates gaps, the controlled pressure in the back-pressure chamber interrupts the high-pressure fluid flow, preventing excessive pressure build-up in the compression chamber.
Solution Approach 2:
The patent converts the potential harmful effect of pressure fluctuations into a beneficial control mechanism. By intentionally creating a back-pressure chamber with controlled pressure, the system uses pressure differential as a corrective force to maintain sealing integrity and prevent harmful leakage when tilts occur.
3Reliability
If fluid is supplied to the back-pressure chamber to reduce orbiting scroll tilt, then pressing force is applied opposite to thrust direction, but excessive time is required to raise back-pressure chamber pressure
Solution Approach 1:
The back-pressure chamber is pre-configured with fluid supply passages and pressure control mechanisms before any tilt occurs. This preliminary preparation allows the chamber to immediately begin counteracting tilt forces without requiring time-consuming pressure build-up, as the infrastructure is already in place to rapidly respond to alignment disturbances.
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 solution allows for quick pressure recovery in the back-pressure chamber, reducing the tilt of the orbiting scroll and facilitating a rapid return to normal operation by providing sustained pressing force and minimizing separation forces.
Implementation Method 1
the check valve (82) blocks the fluid of the back-pressure chamber (56) from back-flowing through an auxiliary introduction passage (81) to the compression chamber (31)
Implementation Method 2
the supply of the refrigerant creates pressing force to be applied to the orbiting scroll in a direction opposite to a thrust direction of the load of gas in the compression chamber, thereby reducing the tilt of the orbiting scroll
Data Source
Figure 1
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AI summary
A scroll compressor comprises a compression mechanism (30) including (i) an introduction mechanism (70) supplying, throughout a first period, a fluid of the compression chamber (31) to a back-pressure chamber (56) in back of the orbiting scroll (35), and (ii) an auxiliary introduction mechanism (80) supplying, throughout a second period, the fluid of the compression chamber (31) to the back-pressure chamber (56), and the second period including a time point prior to the first period.