Scroll Compressor Relief Mechanism for Back Pressure Stabilization
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Solution Overview
Problem
In scroll-type compressors, the overturning of the movable scroll due to increased pressure in the compression chamber leads to leaks and difficulty in reversing the scroll, as refrigerant leaks from the back pressure chamber to the low-pressure side and high-pressure refrigerant leaks to the intake port, causing instability and reduced operational efficiency.
Innovation Solution
A scroll-type compressor design that includes a relief mechanism allowing communication between the compression chamber and the back pressure chamber when injection pressure exceeds back pressure chamber pressure, along with an introduction mechanism to increase back pressure chamber pressure, and a check valve to prevent pressure reduction, thereby stabilizing the back pressure and preventing scroll overturning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If refrigerant is injected into the compression chamber to improve operating efficiency, then the operating efficiency of the air conditioner is improved, but the pressure in the compression chamber increases causing overturning of the movable scroll
Solution Approach 1:
A relief mechanism is introduced as an intermediary component between the compression chamber and the back pressure chamber. This relief mechanism includes a relief passage that activates when injection pressure exceeds back pressure chamber pressure, allowing controlled communication between the chambers to prevent excessive pressure buildup that causes scroll overturning
Solution Approach 2:
The system dynamically changes pressure parameters by monitoring the relationship between injection pressure and back pressure chamber pressure. When injection pressure exceeds back pressure chamber pressure, the relief mechanism activates to adjust the pressure balance, preventing the pressure differential that leads to scroll overturning while maintaining efficient operation
2Object-generated harmful factors
If the movable scroll is overturned, then refrigerant can leak through gaps in the thrust surface and lap surfaces, but this makes it impossible to increase back pressure chamber pressure and difficult to reverse the overturning
Solution Approach 1:
The relief mechanism acts preliminarily to prevent the condition that leads to irreversible leakage. By activating when injection pressure exceeds back pressure chamber pressure, it prevents the pressure differential and gap formation that would cause refrigerant to leak from the back pressure chamber to the low-pressure side, thereby maintaining the ability to reverse scroll overturning
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 solution effectively suppresses overturning of the movable scroll by quickly increasing back pressure chamber pressure, preventing leaks and maintaining operational stability, even during intermediate injection, thus enhancing the compressor's reliability and efficiency.
Implementation Method 1
the compression chamber and the back pressure chamber communicating via the relief mechanism when the injection pressure, which is the pressure of the refrigerant flowing from the injection passage part into the compression chamber, is greater than the pressure in the back pressure chamber
Data Source
AI summary
A scroll-type compressor includes a compression-chamber-forming member, a housing, an injection passage part, and a relief mechanism. The compression-chamber-forming member forms a compression chamber and has a movable scroll and a fixed scroll. The housing forms a back pressure chamber. Refrigerant to apply back pressure to the compression-chamber-forming member is accumulated in the back pressure chamber. The injection passage part is linked to the compression chamber. The relief mechanism is configured to establish a communication between the compression chamber and the back pressure chamber communicating when injection pressure of the refrigerant flowing from the injection passage part into the compression chamber is higher than the pressure in the back pressure chamber.