Capacity Control Valve With Startup-Only CS Port Communication
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Solution Overview
Problem
The existing capacity control valve for variable displacement compressors has poor controllability and operation efficiency due to refrigerant flow from the control port to the suction port during continuous operation, affecting the pressure control chamber's efficiency.
Innovation Solution
A capacity control valve with a primary valve and a CS valve that allows communication between the control port and suction port only during startup and maximum energized states, maintaining equal pressures and preventing refrigerant flow during normal operation, utilizing a solenoid-driven rod and an urging member for precise control and movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the auxiliary communication path is kept open to discharge refrigerant from the control chamber to the suction chamber at startup, then the responsiveness of the variable displacement compressor is improved, but the controllability of the control chamber pressure deteriorates during continuous operation
Solution Approach 1:
The single valve structure is segmented into two functional valves: the primary valve for controlling discharge pressure and the CS valve for controlling communication between control chamber and suction chamber. This segmentation allows independent control of each function, resolving the contradiction between responsiveness (achieved through CS valve) and controllability (maintained through primary valve).
Solution Approach 2:
The CS valve is designed to dynamically open only during specific states (startup and maximum capacity) and remain closed during normal operation. The valve body moves axially to open/close the communication path between control port and suction port based on operational conditions, providing dynamic responsiveness while maintaining stable pressure control.
2Productivity
If the auxiliary communication path is kept in communication state during continuous operation, then the fluid discharge function is excellent at startup, but the operation efficiency of the variable displacement compressor deteriorates
Solution Approach 1:
The auxiliary communication path is activated periodically only when needed (during startup and maximum capacity states) rather than remaining continuously open. The CS valve opens temporarily to discharge refrigerant when required, then closes to maintain proper pressure control, eliminating continuous energy loss while preserving necessary discharge functionality.
3Device complexity
If the primary valve body and rod are fixed together, then the valve structure is simpler, but the ability to independently control the CS valve opening and closing is lost
Solution Approach 1:
The valve assembly is segmented into the primary valve body and the rod as separate movable components. The rod can move axially relative to the primary valve body to open/close the CS valve, while the primary valve body independently controls the main discharge path. This segmentation enables independent control of each valve function while maintaining a relatively simple overall structure.
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
Improves the discharge and operation efficiency of the variable displacement compressor by maintaining control and suction pressures equal, enhancing the compressor's responsiveness and stability during startup and maximum capacity states.
Implementation Method 1
a valve body is moved in the axial direction by an electromagnetic force generated in a solenoid
Implementation Method 2
an urging member configured to urge the primary valve body and the rod in opposite directions
Data Source
AI summary
A capacity control valve includes a CS valve which opens and closes a communication between the control fluid and the suction fluid by the movement of rods and an urging member configured to urge the primary valve body and the rods in opposite directions and the primary valve body and the rods are disposed so as to be relatively movable in an axial direction.