Capacity Control Valve Structure for Fast Compressor Start-Up
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Solution Overview
Problem
Conventional capacity control valves for variable capacity compressors face challenges in rapidly discharging liquid refrigerant during start-up and controlling control chamber pressure, leading to prolonged start-up times and reduced responsiveness.
Innovation Solution
The capacity control valve design includes a valve main body with a first valve part having a smaller opening area than the intermediate communication passage, allowing the second valve part to be disengaged from the second valve seat surface, which decreases the refrigerant flow out of the first valve chamber and increases the flow from the second valve chamber, enabling rapid pressure control of the control chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the first valve part opening area is made large to discharge liquid refrigerant quickly, then the start-up time is reduced, but the control chamber pressure cannot be controlled rapidly
Solution Approach 1:
The valve body is divided into two separate valve parts: a first valve part for discharging liquid refrigerant and a second valve part for controlling control chamber pressure. Each valve part has its own opening area that can be independently optimized, allowing the first valve part to have a larger opening for quick discharge while the second valve part has a smaller opening for precise pressure control.
Solution Approach 2:
Different opening areas are assigned to different valve parts based on their specific functions. The first valve part has a larger opening area optimized for rapid liquid refrigerant discharge, while the second valve part has a smaller opening area optimized for controlled pressure regulation, allowing each component to have locally optimized properties for its specific purpose.
2Speed
If the intermediate communication passage area is made large to increase refrigerant flow, then the pressure control speed is improved, but the liquid refrigerant discharge efficiency is reduced
Solution Approach 1:
The refrigerant flow paths are segmented into two distinct channels: one through the first valve part for liquid refrigerant discharge and another through the intermediate communication passage for pressure control. This segmentation allows each passage to be optimized for its specific function without compromising the other.
Solution Approach 2:
The intermediate communication passage is designed with specific dimensional characteristics that differ from the first valve part opening. The passage has a larger cross-sectional area to facilitate rapid pressure equalization, while the first valve part maintains an optimized opening size for efficient liquid discharge, creating locally optimized flow characteristics for each function.
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 allows for quick discharge of liquid refrigerant and improved responsiveness by controlling the pressure in the control chamber, reducing start-up time and enhancing the compressor's capacity control.
Implementation Method 1
a pressure sensitive body arranged in the interior space and having a communication part communicating with the interior space on a free end part side moving so as to extend and contract in response to the suction pressure
Implementation Method 2
a solenoid section attached to the valve main body and actuating the respective valve parts of the valve body so as to be opened and closed
Data Source
AI summary
In an exemplary embodiment, a capacity control valve includes: a valve main body 2 having a first valve chamber 7 through which a fluid at control pressure passes and which has a first valve seat surface 31A, and an interior space 4 through which a fluid at suction pressure passes; and a valve body 21 having an intermediate communication passage 26 for communicating the first valve chamber 7 and the interior space 4, and a first valve part 21C for opening and closing the intermediate communication passage 26 adjacent to the first valve seat surface 31A, wherein an opening area of the first valve part 21C is smaller than that of the intermediate communication passage 26. The capacity control valve is capable of simultaneously achieving reduction of a start-up time of the variable capacity compressor and improvement of responsiveness of capacity control at the time of control.