Capacity Control Valve With Startup Pressure Relief and Flow Blocking
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Solution Overview
Problem
The existing capacity control valve configuration for variable displacement compressors experiences decreased operating efficiency due to increased refrigerant circulation when the auxiliary communication passage allows refrigerant flow from the control port into the suction port during continuous operation.
Innovation Solution
A capacity control valve with a pressure sensitive valve member and an opening and closing member that restricts fluid flow from the control port to the suction port during normal operation, while allowing communication between the ports at startup to quickly lower control pressure, enhancing discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the auxiliary communication passage allows communication between control port and suction port, then the control pressure is quickly lowered at startup, but the refrigerant circulation amount increases during continuous operation and operating efficiency decreases
Solution Approach 1:
The patent applies the dynamics principle by making the auxiliary communication passage dynamically controllable through a pressure-sensitive valve member. The passage is opened during startup to quickly lower control pressure and improve responsiveness, then automatically closed during continuous operation to prevent unnecessary refrigerant circulation and maintain operating efficiency. The pressure-sensitive valve member responds to pressure changes to automatically transition the system between these two states, enabling the auxiliary passage to serve different functions at different operational phases.
2Productivity
If the main valve is closed to lower control chamber pressure, then the tilt angle of swash plate is maximized, but the refrigerant flows from control port into suction port through auxiliary communication passage
Solution Approach 1:
The patent applies the extraction principle by separating the functions of the auxiliary communication passage into distinct operational phases. The pressure-sensitive valve member extracts the harmful refrigerant circulation pathway during continuous operation by closing the auxiliary passage, while maintaining the beneficial quick-pressure-lowering function during startup. This effectively removes the energy loss mechanism during normal operation while preserving the productivity enhancement capability when needed.
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 solution improves the fluid discharge function at startup and maintains high operating efficiency by preventing refrigerant circulation during continuous operation, thus enhancing the responsiveness and efficiency of the variable displacement compressor.
Implementation Method 1
a valve body moved in an axial direction by electromagnetic force generated in a solenoid
Implementation Method 2
a pressure sensitive body disposed in a pressure sensitive chamber; and a pressure sensitive valve member extending from the valve body to the pressure sensitive chamber and forming a pressure sensitive valve, together with the pressure sensitive body
Data Source
AI summary
Disclosed is a capacity control valve includes a valve housing. A main valve including a valve body is driven by a solenoid, and a main valve seat which is between a discharge port and a control port and with which the valve body can contact, a pressure sensitive valve member forms a pressure sensitive valve, together with a pressure sensitive body disposed in a pressure sensitive chamber. The control port and a suction port communicate with each other through an intermediate communication passage by opening and closing of the pressure sensitive valve. The pressure sensitive valve member has a through-hole communicating with the intermediate communication passage, and has an opening and closing member attached thereto such that the opening and closing member is restricted in movement with respect to the valve housing by restriction device and slides relative to the pressure sensitive valve member to open and close the through-hole.