Scroll Compressor Intermediate Pressure Extraction for Orbiting Scroll Stability
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Solution Overview
Problem
Under low compression ratio conditions, the orbiting scroll in scroll compressors tends to separate from the fixed scroll, leading to excessive intermediate pressure in the compression chamber, which destabilizes the orbiting behavior.
Innovation Solution
A scroll compressor design featuring a fixed scroll with an intermediate pressure extraction hole and communication path, a high pressure communication path with a balance valve, and an oil storage system to manage lubricant oil distribution and pressure regulation, preventing orbiting scroll separation and enhancing airtightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If intermediate pressure in the compression chamber is reduced under low compression ratio conditions, then the orbiting scroll remains stable and maintains contact with the fixed scroll, but the compression efficiency decreases
Solution Approach 1:
The compression chamber pressure is segmented into different zones: a high-pressure region near the discharge port, an intermediate pressure region in the mid-flow area, and a low-pressure region near the suction port. The intermediate pressure extraction hole selectively extracts pressure from the intermediate region, allowing the high-pressure zone to maintain compression efficiency while the overall intermediate pressure is controlled to prevent orbiting scroll separation.
Solution Approach 2:
The intermediate pressure extraction hole acts as an intermediary mechanism that selectively removes excessive pressure from the intermediate region of the compression chamber. This mediator allows the system to maintain high pressure where needed for compression while preventing excessive intermediate pressure that causes orbiting scroll instability, thus resolving the contradiction between compression efficiency and stability.
2Reliability
If the compression ratio is reduced to prevent orbiting scroll separation, then the orbiting scroll maintains stable contact with the fixed scroll, but the pressure regulation capability deteriorates
Solution Approach 1:
Different regions of the compression chamber are given different pressure characteristics: the discharge region maintains high pressure for efficient compression, while the intermediate region has its pressure extracted to prevent orbiting scroll separation. The intermediate pressure extraction hole is strategically positioned to affect only the intermediate region, allowing local pressure optimization without compromising overall pressure regulation capability.
Solution Approach 2:
The system dynamically adjusts pressure distribution through the intermediate pressure extraction hole, which actively removes excessive pressure from the intermediate region during compression. This dynamic pressure regulation maintains stable orbiting scroll contact while preserving the ability to regulate pressure across different compression stages, preventing both separation and pressure regulation deterioration.
3Stability of the object's composition
If an intermediate pressure extraction hole and communication path are added, then intermediate pressure is controlled and orbiting scroll separation is prevented, but the device complexity increases
Solution Approach 1:
The intermediate pressure extraction hole and communication path are merged into the existing fixed scroll structure. The extraction hole is formed directly in the fixed scroll, and the communication path utilizes the existing chamber spaces, eliminating the need for separate external components. This integration achieves intermediate pressure control while minimizing increases in device complexity.
Solution Approach 2:
The fixed scroll serves multiple functions: it provides the structural framework for the compression chamber, forms the high-pressure region boundary, and incorporates the intermediate pressure extraction hole and communication path. This multi-functionality reduces the need for additional dedicated components, achieving pressure control with minimal added complexity.
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 adjusts intermediate pressure and reduces the compression ratio, preventing orbiting scroll separation and improving airtightness, especially under low compression ratio conditions.
Implementation Method 1
an intermediate pressure extraction hole which extracts intermediate pressure of the compression chamber
Implementation Method 2
a balance valve is provided in a high pressure opening of the high pressure communication path
Implementation Method 3
an orbiting scroll, and a rotation shaft for driving the orbiting scroll in an orbiting manner
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
According to a scroll compressor of the present invention, a fixed scroll mirror plate 11a is provided with an intermediate pressure extraction hole 41 through which intermediate pressure of a compression chamber 15 is taken out, an intermediate pressure communication path 42 for bringing the intermediate pressure extraction hole 41 and an intermediate pressure region B into communication with each other is formed in a fixed scroll 11, a high pressure communication path 71 for bringing the intermediate pressure extraction hole 41 and a high pressure space in a hermetic container 1 into communication with each other is formed in the fixed scroll 11, and a balance valve 73 is provided in a high pressure opening 72 of a high pressure communication path 71. According to this, intermediate pressure in mid-flow of compression of the compression chamber 15 is adjusted to predetermined pressure, and a compression ratio of a low compression ratio condition in which an orbiting scroll 12 separates from the fixed scroll 11 can be made small.