Capacity Control Valve With CS Valve for Compressor Efficiency
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Solution Overview
Problem
During continuous driving of a variable displacement compressor, the auxiliary communication passage allows refrigerant to flow from the control port into the suction port, deteriorating compression efficiency.
Innovation Solution
A capacity control valve with a CS valve that includes a CS valve seat and body, allowing communication between the control and suction ports, maintaining equal pressures and ensuring the main valve remains closed during normal operation, and opens to equalize pressures during maximum energization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an auxiliary communication passage is provided to discharge refrigerant from the control chamber to the suction chamber during startup, then the responsiveness of the variable displacement compressor is improved, but during continuous driving the compression efficiency is deteriorated due to refrigerant flowing from the control port into the suction port
Solution Approach 1:
The auxiliary communication passage is divided into two separate passages: a first auxiliary communication passage for startup operation and a second auxiliary communication passage for continuous driving. This segmentation allows each passage to serve its specific function without interfering with the other, resolving the contradiction between startup responsiveness and continuous driving efficiency
Solution Approach 2:
The function of the auxiliary communication passage is extracted and separated into two distinct passages based on operational conditions. The first passage is extracted for startup use only, while the second passage is extracted for continuous driving use, eliminating the harmful effect of refrigerant leakage during continuous operation
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 maintains high compression efficiency and effective fluid discharge during startup and continuous operation.
Implementation Method 1
a rod driven by a solenoid; and a main valve that includes a main valve seat and a main valve body to open and close communication between the discharge port and the control port in accordance with a movement of the rod
Data Source
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AI summary
There is provided a capacity control valve that displays good responsiveness during normal control. A capacity control valve V includes a valve housing 10 provided with a discharge port 12 through which a discharge fluid at a discharge pressure Pd passes, a suction port 13 through which a suction fluid at a suction pressure Ps passes, and a control port 14 through which a control fluid at a control pressure Pc passes; a rod 83 driven by a solenoid 80; and a main valve 50 that includes a main valve seat 53a and a main valve body 51 to open and close communication between the discharge port 12 and the control port 14 in accordance with a movement of the rod 83. The capacity control valve V further includes a CS valve 56 that includes a CS valve seat 82b and a CS valve body 53 to open and close communication between the control port 14 and the suction port 13. The CS valve body 53 is disposed so as to be movable relative to the main valve body 51. The main valve body 51 and the CS valve body 53 move together in accordance with the movement of the rod 83 while a closed state of the main valve 50 is maintained.