Capacity Control Valve with Auxiliary Passage for Stable Compressor Flow
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Solution Overview
Problem
Conventional capacity control valves for variable capacity compressors face issues with maintaining constant fluid volume flow to the first valve chamber due to pressure fluctuations in the third valve chamber, leading to deteriorated control performance.
Innovation Solution
The capacity control valve includes an auxiliary communication part with an adjustable opening area, which allows for precise control of fluid volume flow to the first valve chamber, improving operation efficiency by maintaining constant fluid flow even with pressure fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the third valve chamber pressure is allowed to fluctuate to enable quick liquid refrigerant discharge at start-up, then the liquid refrigerant can be discharged quickly, but the fluid volume flow to the first valve chamber becomes unstable, deteriorating control performance
Solution Approach 1:
The patent divides the flow control function into two independent pathways: one for liquid refrigerant discharge (third valve chamber to suction chamber) and another for control fluid supply (third valve chamber to first valve chamber via auxiliary communication passage). This segmentation allows each pathway to operate independently, enabling quick discharge while maintaining stable control fluid flow.
Solution Approach 2:
The auxiliary communication passage acts as an intermediary pathway that provides a dedicated route for control fluid flow from the third valve chamber to the first valve chamber. This intermediary structure isolates the control fluid flow from the pressure fluctuations caused by liquid refrigerant discharge, ensuring stable control performance.
2Productivity
If the opening area of the auxiliary communication passage is increased to improve fluid volume flow, then the control response becomes faster, but the pressure stability in the first valve chamber deteriorates
Solution Approach 1:
The patent optimizes the opening area parameter of the auxiliary communication passage to achieve the best balance between control response speed and pressure stability. By carefully selecting this parameter, the system achieves fast control response while maintaining stable pressure in the first valve chamber.
3Device complexity
If the capacity control valve structure is simplified without the auxiliary communication passage, then the device complexity is reduced, but the control performance deteriorates due to unstable fluid volume flow
Solution Approach 1:
The auxiliary communication passage serves as a simple intermediary structure that provides a dedicated flow path for control fluid. This minimal addition to the valve structure ensures stable fluid volume flow to the first valve chamber without significantly increasing device 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
This design stabilizes the pressure of the suction chamber, enhancing the controllability of the variable capacity compressor by ensuring a constant fluid volume flow to the first valve chamber, thereby improving overall compressor performance.
Implementation Method 1
a pressure-sensitive body 178 which is arranged in the third valve chamber to extend and contract by ambient pressure
Implementation Method 2
a solenoid section 190 for exerting an electromagnetic driving force on the valve body 181
Data Source
AI summary
A capacity control valve (1) for controlling a flow rate or pressure of a variable capacity compressor according to a valve opening degree of a valve section includes: a valve main body (10) having a first valve chamber (14), a second valve chamber (15) and an interior space (16); a valve body (21) having an intermediate communication passage (26) for allowing communication between the first valve chamber and the interior space, a first valve part (21c1) arranged in the first valve chamber, a second valve part (21b1) for opening and closing communication between the interior space and the second valve chamber, and a shaft part (21a) arranged in the interior space; a solenoid (30); a pressure-sensitive body (22) arranged in the interior space; and an auxiliary communication part (21f) which is arranged in the interior space and which allows communication between the interior space and the intermediate communication passage.