Capacity Control Valve With Movable CS Valve for Compressor Efficiency
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Solution Overview
Problem
During continuous driving of a variable displacement compressor, the auxiliary communication passage leads to a deterioration in compression efficiency due to refrigerant flow from the control port into the suction port, affecting fluid discharge function.
Innovation Solution
A capacity control valve design featuring a main valve and a CS valve, where the CS valve body is movable relative to the main valve body, allowing the CS valve to be closed during normal control and opened during maximum energization to equalize control and suction pressures, ensuring effective fluid discharge and high compression efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an auxiliary communication passage is formed to discharge refrigerant from the control chamber to the suction chamber during startup, then the fluid discharge function during startup is improved, but during continuous driving the refrigerant flows from the control port into the suction port causing deterioration in compression efficiency
Solution Approach 1:
The single auxiliary communication passage is divided into two separate passages: a first auxiliary communication passage that operates during startup to discharge refrigerant from the control chamber to the suction chamber, and a second auxiliary communication passage that operates during continuous driving to discharge refrigerant from the control port to the suction port. This segmentation allows each passage to be optimized for its specific operational phase, preventing the deterioration of compression efficiency during continuous driving while maintaining effective fluid discharge during startup.
2Productivity
If the auxiliary communication passage remains open during continuous driving to maintain fluid discharge capability, then the responsiveness is improved, but the compression efficiency deteriorates due to refrigerant flow from control port to suction port
Solution Approach 1:
The system dynamically switches between different auxiliary communication passages based on the operational state of the variable displacement compressor. During startup, the first auxiliary communication passage is activated to provide rapid pressure equalization and improve responsiveness. During continuous driving, the system transitions to using the second auxiliary communication passage, which is configured to maintain responsiveness while preventing harmful refrigerant flow that would reduce compression efficiency. This dynamic switching allows the system to adapt its fluid discharge characteristics to match the current operational requirements.
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
The design maintains high compression efficiency and effective fluid discharge during both startup and continuous operation by maintaining equal pressures between the control and suction ports, improving the responsiveness and performance of the variable displacement compressor.
Implementation Method 1
a valve body moved in an axial direction by electromagnetic force which is generated in a solenoid when energization is controlled
Data Source
AI summary
A capacity control valve includes a valve housing provided with a discharge port, a suction port, and a control port a rod driven by a solenoid; and a main valve that includes a main valve seat and a main valve body between the discharge port and the control port in accordance with a movement of the rod. The capacity control valve V further includes a CS valve that includes a CS valve seat and a CS valve body communication between the control port and the suction port. The CS valve body is disposed so as to be movable relative to the main valve body. The main valve body and the CS valve body move together in accordance with the movement of the rod while a closed state of the main valve is maintained.