Compressor Capacity Control Valve for Startup Discharge and Efficiency
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Solution Overview
Problem
The existing capacity control valve for variable displacement compressors experiences deteriorated compression efficiency due to refrigerant flow from the control port into the suction port through an auxiliary communication passage during continuous driving, affecting fluid discharge function.
Innovation Solution
A capacity control valve design featuring a main valve and a CS valve that move together to open communication between the control port and suction port, allowing control pressure to be lowered, along with an opening and closing valve that connects the control fluid supply chamber and suction port, ensuring stable fluid discharge and high compression efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an auxiliary communication passage is always in communication between control port and suction port, then fluid discharge function during startup is improved, but compression efficiency is deteriorated during continuous driving
Solution Approach 1:
The patent applies the dynamics principle by making the auxiliary communication passage dynamically controllable rather than always open. A CS valve is introduced to selectively open or close the auxiliary communication passage between control port and suction port based on operational conditions. During startup, the CS valve opens to enable fluid discharge and improve responsiveness. During continuous driving, the CS valve closes to prevent refrigerant leakage and maintain compression efficiency. This dynamic control resolves the contradiction between startup performance and continuous operation efficiency.
2Measurement precision
If the main valve body moves independently to control main valve opening, then control precision is improved, but device complexity increases
Solution Approach 1:
The patent applies the merging principle by combining the control functions of the main valve and CS valve into a unified rod-driven mechanism. The rod simultaneously controls both the main valve body and CS valve body, coordinating their movements. When the rod moves, it first opens the main valve, then with further movement in the maximum energized state, it opens the CS valve while maintaining main valve closure. This merged control structure achieves precise control of multiple valves without requiring separate complex control systems, thus resolving the contradiction between control precision and device complexity.
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 provides a capacity control valve with improved fluid discharge function during startup and high compression efficiency by maintaining the closed state of the main valve and CS valve, allowing precise control of the valve body movement and pressure distribution.
Implementation Method 1
a rod driven by a solenoid; a main valve that includes a main valve seat and a main valve body to open and close a communication between the discharge port and the control port in accordance with a movement of the rod
Data Source
AI summary
A capacity control valve includes: a valve housing having a discharge port, a suction port and a control port; a rod driven by a solenoid; a main valve configured to open and close a communication between the discharge port and the control port; an opening and closing valve biased in a valve closing direction, and configured to open and close a CS communication passage communicating with the suction port and a control fluid supply chamber formed in the valve housing; and a CS valve to open and close a communication between the control port and the suction port, the CS valve body being movable relative to the main valve body, wherein the main valve body and the CS valve body move together as the rod moves in a closed state of the main valve.