Differential Pressure Regulating Valve with Segmented Communication Passages
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Solution Overview
Problem
Existing differential pressure regulating valves in scroll type compressors experience irregular refrigerant flow and generate abnormal noise due to turbulent flow when the valve opens, especially when the compressor is stopped.
Innovation Solution
A differential pressure regulating valve with a cylindrical valve chamber, a valve hole, a support member, and an urging member, where the support member has a communication passage with uniformly spaced openings to the outer periphery, preventing lateral displacement of the valve body and ensuring smooth refrigerant flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bleed passage is formed extending from the lateral side of the valve chamber, then the pressure regulating valve can release excess pressure from the back pressure chamber, but irregular flow of refrigerant gas occurs causing turbulent flow and abnormal noise
Solution Approach 1:
The single lateral bleed passage is segmented into multiple communication passages (first, second, third, and fourth communication passages) opening at different locations around the valve chamber. This segmentation distributes the refrigerant flow path, preventing concentrated turbulent flow and reducing abnormal noise while maintaining effective pressure regulation.
2Ease of operation
If the valve body is allowed to move freely in the valve chamber, then the valve can respond to pressure differential, but the valve body is displaced in directions perpendicular to the spring axis causing turbulent flow
Solution Approach 1:
A guide pin is introduced as an intermediary component between the valve body and the valve chamber wall. The guide pin fits into a guide hole in the valve body and extends into the valve chamber, constraining the valve body to move only along the urging spring axis while allowing pressure-responsive movement. This prevents lateral displacement and eliminates turbulent flow caused by unstable valve body position.
3Reliability
If refrigerant gas flows around the valve body through the space between the valve body and valve chamber, then the valve chamber can be sealed, but irregular flow occurs and abnormal noise is generated
Solution Approach 1:
The single flow path around the valve body is segmented into multiple controlled communication passages at different locations. This segmentation creates multiple small, controlled flow paths instead of one large uncontrolled path, distributing the flow and preventing turbulent flow and abnormal noise while maintaining sealing effectiveness.
Solution Approach 2:
Different communication passages are positioned at specific locations around the valve chamber to create locally optimized flow patterns. The first and second communication passages are positioned to control flow in one region, while the third and fourth passages control flow in another region, ensuring smooth, laminar flow throughout the entire valve chamber and eliminating abnormal noise.
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 suppresses irregular refrigerant flow and associated noise by ensuring uniform distribution of refrigerant around the valve body, maintaining smooth operation and reducing noise generation.
Implementation Method 1
an urging spring adapted to urge the valve body in the direction that causes the valve body to close the valve hole
Implementation Method 2
The support member has a communication passage for fluid communication between a first valve chamber formed on the valve body side of the support member in the valve chamber and a second valve chamber formed on the opposite side of the support member in the valve chamber. At least a part of the communication passage is opened at uniformly spaced intervals to the outer periphery of the support member on the first valve chamber side.
Data Source
AI summary
A differential pressure regulating valve is disposed in a fluid passage. The differential pressure regulating valve includes a valve chamber, a valve hole, a valve body, a support member and an urging member. The valve chamber is formed in the fluid passage and having a cylindrical shape. The valve hole is formed in the fluid passage as an opening which communicates with the valve chamber. The valve body is disposed in the valve chamber and adapted to open and close the valve hole. The support member is fixedly mounted to the valve chamber and extending across flowing direction of the fluid in the valve chamber. The support member has a communication passage for fluid communication between a first valve chamber and a second valve chamber. The urging member is disposed between the support member and the valve body for urging the valve body toward the valve hole.