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 consistent fluid volume flow to the first valve chamber due to pressure fluctuations in the third valve chamber, leading to deteriorated control performance.
Innovation Solution
A capacity control valve design featuring an auxiliary communication part with a smaller opening area than the intermediate communication passage, allowing for adjustment of fluid volume flowing to the first valve chamber, and including a pressure-sensitive body and solenoid section to manage pressure and flow effectively.
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 flowing to the first valve chamber becomes unstable, deteriorating control performance
Solution Approach 1:
The patent segments the fluid flow paths by introducing a fourth valve chamber that is selectively communicable with either the third valve chamber or the first valve chamber, but not both simultaneously. This segmentation allows independent control of liquid discharge path and control fluid supply path, resolving the contradiction between quick discharge and stable control.
Solution Approach 2:
The fourth valve chamber acts as an intermediary chamber that receives control fluid from the third valve chamber and then supplies it to the first valve chamber. This intermediary structure buffers pressure fluctuations, ensuring stable fluid volume delivery to the first valve chamber even when the third valve chamber experiences pressure changes during liquid discharge.
2Device complexity
If a conventional communication path is used between the third valve chamber and the first valve chamber, then the structure is simple, but the fluid volume varies with pressure fluctuations, reducing control precision
Solution Approach 1:
The fourth valve chamber serves as an intermediary that decouples the pressure fluctuations in the third valve chamber from the first valve chamber. By introducing this intermediate stage, the system achieves precise control of fluid volume to the first valve chamber without significantly increasing overall structural complexity.
Solution Approach 2:
The patent employs dynamic selective communication mechanisms (sol enoid valves or shift valves) that can change the connectivity state between valve chambers based on operational requirements. This dynamic reconfiguration allows the system to switch between different operational modes while maintaining control precision.
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 fluid volume flowing to the first valve chamber, improving the control performance and efficiency of the variable capacity compressor by maintaining constant fluid flow despite pressure fluctuations.
Implementation Method 1
a pressure-sensitive body which is arranged in the third valve chamber to extend and contract by ambient pressure
Implementation Method 2
a solenoid section for exerting an electromagnetic driving force on the valve body 181
Data Source
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AI summary
The purpose of the present invention is to provide a capacity control valve for controlling a flow rate or pressure of a variable capacity compressor according to a valve opening degree of a valve section, the capacity control valve capable of improving operation efficiency of the variable capacity compressor. 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 14 and the interior space 16, a first valve part 21c1 arranged in the first valve chamber 14, a second valve part 21b1 for opening and closing communication between the interior space 16 and the second valve chamber 15, 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 16 and which allows communication between the interior space 16 and the intermediate communication passage 26.