Compressor Capacity Control Valve With Startup Discharge Isolation
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Solution Overview
Problem
The existing capacity control valves for variable displacement compressors suffer from poor controllability and operation efficiency during continuous driving states, as the auxiliary communication path leads to refrigerant flow from the control port to the suction port, affecting the pressure control of the control chamber.
Innovation Solution
A capacity control valve design incorporating a differential CS valve and an electromagnetic CS valve, which opens to communicate the control port with the suction port at startup for improved responsiveness and closes to prevent fluid flow in the non-energized state, ensuring high operation efficiency by regulating the pressure difference between the control and suction pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the auxiliary communication path is formed to communicate the control port and suction port, then the responsiveness at startup is improved by quickly discharging refrigerant from the control chamber, but the controllability of the control chamber pressure deteriorates during continuous driving state due to refrigerant flow from control port to suction port
Solution Approach 1:
The patent divides the single communication path into two separate communication paths: a first communication path for rapid refrigerant discharge at startup, and a second communication path for controlled refrigerant flow during normal operation. This segmentation allows each path to be optimized for its specific function, resolving the contradiction between startup responsiveness and operational controllability
Solution Approach 2:
The patent employs dynamic valve mechanisms (first and second communication valves) that can change their state based on operating conditions. During startup, the first communication path is activated for rapid discharge, while during normal operation, the second communication path is activated for controlled flow, allowing the system to adapt its behavior to different operational phases
2Productivity
If the primary valve is closed to decrease control chamber pressure for maximum capacity operation, then the discharge amount is maximized, but the operation efficiency deteriorates due to continuous refrigerant flow through the auxiliary communication path
Solution Approach 1:
The patent segments the communication paths and valve mechanisms into distinct first and second systems, allowing the second communication path to be specifically optimized for maximum capacity operation. This enables controlled refrigerant flow that maintains high discharge amount while preventing the energy losses associated with uncontrolled continuous flow through a single auxiliary path
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 enhances the responsiveness at startup by quickly discharging refrigerant from the control chamber and maintains high operation efficiency during normal control states by preventing fluid flow from the control port to the suction port, thereby improving the controllability and efficiency of the variable displacement compressor.
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 includes a differential CS valve body of a cylindrical shape and a differential CS spring which urges the differential CS valve body in a valve opening direction and is openable and closable by a pressure difference between the control pressure and the suction pressure
Implementation Method 3
an electromagnetic CS valve includes an electromagnetic CS valve body and an electromagnetic CS spring configured to urge the electromagnetic CS valve body in a valve closing direction and 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
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AI summary
There is provide 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 12 allowing a discharge fluid of a discharge pressure Pd to pass therethrough, suction ports 13 and 15 allowing a suction fluid of a suction pressure Ps to pass therethrough, and a control port 14 allowing a control fluid of a control pressure Pc to pass therethrough and a primary valve 50 including a primary valve seat 10a and a primary valve body 51 driven by a solenoid 80, the primary valve 50 being configured to open and close a communication between the discharge port 12 and the control port 14 in accordance with a movement of the primary valve body 51. The capacity control valve V further includes a differential CS valve 57 which is openable and closable by a pressure difference between the control pressure Pc and the suction pressure Ps and an electromagnetic CS valve 58 that is openable and closable so as to close the control port 14 and the suction port 15 in a non-energized state of the solenoid 80 in accordance with the movement of the primary valve body 51.