Capacity Control Valve With CS Valve for Startup Pressure Control
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Solution Overview
Problem
The existing capacity control valve for variable displacement compressors experiences poor controllability and operation efficiency during continuous driving and restart conditions due to the auxiliary communication path, leading to reduced fluid discharge function and responsiveness.
Innovation Solution
A capacity control valve design featuring a primary valve and a CS valve with opposing spring forces, where the primary valve body is closed and the CS valve is open during startup to quickly discharge refrigerant from the control chamber, and vice versa during non-energized states to prevent fluid flow into the suction port, enhancing responsiveness and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an auxiliary communication path is formed to discharge refrigerant from the control chamber to the suction chamber at startup, then startup responsiveness is improved, but controllability of the control chamber pressure deteriorates during continuous driving
Solution Approach 1:
The patent divides the valve structure into two separate valves: a primary valve for controlling the main communication path between discharge chamber and control chamber, and a CS (communication stop) valve for controlling the auxiliary communication path between control chamber and suction chamber. This segmentation allows independent control of each path, enabling the auxiliary path to be closed during continuous driving while remaining open during startup, thus resolving the contradiction between startup responsiveness and pressure controllability.
2Productivity
If the auxiliary communication path remains open to improve startup fluid discharge, then startup performance is enhanced, but operation efficiency deteriorates when the compressor is restarted after short-time stop
Solution Approach 1:
The CS valve is designed to dynamically change its state based on operational conditions: it remains open during startup to enable rapid refrigerant discharge and improve responsiveness, but closes during continuous driving and restart conditions to prevent refrigerant leakage and maintain control chamber pressure. This dynamic state change allows the system to optimize performance for different operational phases, resolving the contradiction between startup fluid discharge and restart controllability.
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 improves startup responsiveness and maintains high operation efficiency by ensuring effective fluid discharge and control pressure management, maintaining high controllability and efficiency across various operational states.
Implementation Method 1
a primary valve including a primary valve seat and a primary valve body driven by a solenoid and opening and closing a communication between the discharge port and the control port by a movement of the primary valve body
Implementation Method 2
a CS valve which includes a CS valve body, a first spring configured to urge the CS valve body in a closing direction of the CS valve, and a second spring urging the CS valve body in an opening direction of the CS valve
Data Source
AI summary
A capacity control valve includes a valve housing provided with a discharge port, suction ports, a control port allowing a control fluid of a control pressure Pc to pass therethrough and a primary valve including a primary valve seat and a primary valve body driven by a solenoid and opening and closing a communication between the discharge port and the control port by the movement of the primary valve body. The capacity control valve further includes a CS valve which includes a CS valve body, a first spring urging the CS valve body in a closing direction, and a second spring urging the CS valve body in an opening direction, the control port and the suction port being opened at a valve closed position of the primary valve body, the control port and the suction port being closed at a valve opened position of the primary valve body.