Differential CS Capacity Valve for Startup Discharge and Pressure Control
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Solution Overview
Problem
The existing capacity control valve for variable displacement compressors experiences poor controllability and operation efficiency during continuous driving states due to the auxiliary communication path's through-hole allowing refrigerant flow from the control port to the suction port, affecting the pressure control chamber's efficiency.
Innovation Solution
A capacity control valve with a differential CS valve that divides the control pressure chamber into discharge and suction sides, using a spring to control the communication between the control ports and suction port based on pressure differences, ensuring efficient fluid discharge at startup and maintaining high operation efficiency by regulating the primary and differential CS valve movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the auxiliary communication path with through-hole is kept open during continuous driving state, then fluid discharge function at startup is improved, but controllability of control chamber pressure deteriorates and operation efficiency decreases
Solution Approach 1:
The patent applies the dynamics principle by making the auxiliary communication path dynamically controllable. The differential CS valve body moves between open and closed positions based on pressure differential, allowing the system to adapt its configuration: open during startup for rapid discharge, closed during continuous operation for precise pressure control. This transforms a static through-hole into a dynamic flow path controlled by pressure conditions.
2Reliability
If the auxiliary communication path is open, then refrigerant can be discharged quickly at startup, but pressure control in control chamber becomes poor
Solution Approach 1:
The patent applies parameter changes by utilizing pressure differential as the controlling parameter. When pressure in discharge side control chamber becomes lower than suction side, the differential pressure opens the auxiliary communication path for rapid discharge. During normal operation, pressure equilibrium keeps the path closed, ensuring precise pressure control. The system changes its flow characteristics based on pressure parameter variations.
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 responsiveness at startup by quickly discharging liquefied fluid from the control chamber into the suction chamber and maintains high operation efficiency by controlling the differential CS valve's opening and closing based on solenoid drive force, enhancing the controllability and efficiency of the variable displacement compressor.
Implementation Method 1
a spring configured to urge the differential CS valve body in a closing direction is disposed between the differential CS valve body and the primary valve body
Implementation Method 2
a primary valve which includes a primary valve seat and a primary valve body driven by a solenoid and controls a flow of a fluid between the discharge port and the control port by a movement of the primary valve body
Implementation Method 3
when a differential pressure is generated as a result that a pressure in the discharge side control chamber, which acts on the differential CS valve body in the axial direction, becomes smaller than a pressure in the suction side control chamber, which acts on the differential CS valve body in the axial direction, the differential CS valve body is operated by the differential pressure
Data Source
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AI summary
There is provided a capacity control valve having good operation efficiency while having a fluid discharge function at startup. A capacity control valve V includes a valve housing 10 provided with a discharge port 13, suction ports 14 and 17, and a control port (a first control port 15, a second control port 16) and a primary valve 50 which includes a primary valve seat 10a and primary valve bodies 51 and 54 driven by a solenoid 80 and controls a flow of a fluid between the discharge port 13 and the control port 15 by a movement of the primary valve bodies 51 and 54. The capacity control valve V further includes a differential CS valve 57 which includes a differential CS valve body 90 disposed so as to be relatively movable in an axial direction with respect to the primary valve bodies 51 and 54. The differential CS valve body 90 divides a control pressure chamber 30 into a discharge side control chamber 30A communicating with the first control port 15 and a suction side control chamber 30B communicating with the second control port 16 in the axial direction and operates the differential CS valve body 90 by a differential pressure between the discharge side control chamber 30A and the suction side control chamber 30B so as to open the second control port 16 and the suction port 17.