Scroll Compressor Seal Ring Pressure Regulation
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Solution Overview
Problem
In scroll compressors, when the pressure of the high-pressure line decreases, the pressure reduction in the compression chamber at the discharge position leads to a reduction in the separating force between the orbiting and fixed scrolls, resulting in an excessive pressing force on the orbiting scroll due to the imbalance in pressures between the high-pressure and back pressure spaces.
Innovation Solution
A scroll compressor design that includes a fluid passage between the high-pressure and back pressure spaces, with a seal ring that expands to block fluid flow when the back pressure is lower and contracts to allow flow when it is higher, regulating the pressure and preventing excessive force on the orbiting scroll by ensuring the back pressure space does not exceed the high-pressure space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the back pressure space is used to press the orbiting scroll against the fixed scroll, then the separation between scrolls is improved, but when high-pressure line pressure decreases, excessive pressing force is generated causing thrust loss
Solution Approach 1:
The patent applies a dynamic sealing ring that can freely expand and contract within a ring groove to automatically regulate the oil flow through the fluid passage. This dynamic adjustment mechanism allows the system to adapt to varying pressure conditions, maintaining appropriate pressing force on the orbiting scroll while preventing excessive thrust loss when high-pressure line pressure decreases.
Solution Approach 2:
The patent changes the physical state parameters of the sealing ring (expansion and contraction) in response to pressure differential changes. When the pressure difference between the back pressure space and high-pressure space exceeds a predetermined value, the sealing ring expands to block the fluid passage; when the pressure difference is within the predetermined range, the sealing ring contracts to allow oil flow, thus regulating the pressing force dynamically.
2Reliability
If the seal ring blocks fluid flow to regulate pressure, then excessive pressing force is reduced, but the device complexity increases
Solution Approach 1:
The sealing ring constitutes a self-regulating mechanism that automatically responds to pressure differential changes without external control. The ring freely expands and contracts within the ring groove based on the pressure difference between the back pressure space and high-pressure space, blocking or allowing oil flow as needed. This self-service mechanism maintains reliability while minimizing the need for additional complex control systems.
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 effectively reduces the excessive pressing force on the orbiting scroll by regulating the pressure difference between the high-pressure and back pressure spaces, enhancing the reliability and reducing thrust loss by maintaining balanced pressures within the compressor.
Implementation Method 1
an oil flow regulating mechanism constituted by a seal ring configured to freely expand and contract within a ring groove to regulate the oil flow through the fluid passage
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A scroll compressor (10) includes a high-pressure space (54) capable of communicating with a discharge port (32) and a back pressure space (56) capable of communicating with an intermediate port (33). A fluid passage (4) includes a seal ring (1) that closes the fluid passage (4) when the pressure of the back pressure space (56) is lower than that of the high-pressure space (54), and opens the fluid passage (4) when the pressure of the back pressure space (56) is higher than that of the high-pressure space (54).