Capacity Control Valve With Differential CS Valve for Leakage-Free Control
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Solution Overview
Problem
The controllability of the pressure in the control chamber of a variable displacement compressor is poor during continuous driving, leading to deteriorated operation efficiency due to the auxiliary communication path allowing refrigerant flow from the control port to the suction port.
Innovation Solution
A capacity control valve with a primary valve, a differential CS valve, and an electromagnetic CS valve that opens and closes to manage the communication between the discharge, suction, and control ports, ensuring the control fluid does not flow into the suction port during normal operation, and rapidly discharges the control chamber fluid at startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an auxiliary communication path is formed to discharge refrigerant from the control chamber to the suction chamber at startup, then responsiveness at startup is improved, but controllability of the control chamber pressure deteriorates during continuous driving
Solution Approach 1:
The patent employs a differential CS valve that dynamically changes its state based on pressure differential. At startup when control chamber pressure is high, the differential pressure opens the auxiliary communication path for rapid discharge. During normal operation when control chamber pressure is maintained, the differential pressure closes the path to prevent leakage. This dynamic behavior resolves the contradiction between startup responsiveness and operational controllability.
Solution Approach 2:
The differential CS valve acts as an intermediary mechanism between the control chamber and suction chamber. It mediates the auxiliary communication path by opening it only when the pressure differential between control and suction chambers exceeds a threshold, enabling controlled fluid discharge at startup while preventing unwanted flow during normal operation, thus resolving the controllability issue.
2Productivity
If the auxiliary communication path remains open during continuous driving, then fluid discharge function is maintained, but operation efficiency of the variable displacement compressor deteriorates
Solution Approach 1:
The differential CS valve dynamically adjusts the auxiliary communication path based on real-time pressure differential between control and suction chambers. During continuous driving, the maintained control chamber pressure creates a pressure differential that closes the valve, preventing refrigerant leakage and energy loss while maintaining the capability for rapid discharge when pressure differential increases, thus resolving the efficiency contradiction.
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 configuration improves responsiveness at startup and maintains high operation efficiency by preventing fluid leakage during normal control states, ensuring precise control and efficient fluid management.
Implementation Method 1
a primary valve including a primary valve seat and a primary valve body driven by a solenoid, the primary valve being configured to open and close a communication between the discharge port and the control port in accordance with a movement of the primary valve body
Implementation Method 2
a differential CS valve that is openable and closable by a pressure difference between the control pressure and the suction pressure
Implementation Method 3
an electromagnetic CS valve that is openable and closable so as to close the control port and the suction port in a non-energized state of the solenoid
Data Source
AI summary
A capacity control valve includes a valve housing provided with a discharge port, suction ports, and a control port and a primary valve including a primary valve seat and a primary valve body driven by a solenoid, the primary valve being configured to open and close a communication between the discharge port and the control port in accordance with a movement of the primary valve body. The capacity control valve further includes a differential CS valve which is openable and closable by a pressure difference between the control pressure Pc and the suction pressure Ps and an electromagnetic CS valve that is openable and closable so as to close the control port and the suction port in a non-energized state of the solenoid 80 in accordance with the movement of the primary valve body.