Capacity Control Valve With CS Valve for Compression Efficiency
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Solution Overview
Problem
The existing capacity control valve for variable displacement compressors experiences deteriorated compression efficiency during continuous driving due to refrigerant flow from the control port into the suction port through an auxiliary communication passage, which affects fluid discharge function during startup.
Innovation Solution
A capacity control valve design featuring a main valve and a CS valve that allows controlled communication between the discharge and control ports, with the CS valve closing during normal operation and opening during maximum energization to lower control pressure, assisted by a pressure drive unit operated by suction pressure, 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 to discharge control fluid 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 via the auxiliary communication passage and compression efficiency is deteriorated
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 the control port and suction port based on operating conditions. During startup, the CS valve opens to enable rapid pressure equalization and improve fluid discharge function. During continuous driving, the CS valve closes to prevent refrigerant leakage and maintain compression efficiency. This dynamic control mechanism resolves the contradiction by adapting the system state to different operational phases.
2Ease of operation
If the main valve body is disposed so as to be movable relative to the CS valve body, then the opening and closing of the main valve can be controlled in a state where the CS valve is closed during normal control, but the structure becomes more complex
Solution Approach 1:
The patent applies the merging principle by integrating the main valve body and CS valve body into a unified movable assembly. Both valve bodies are coupled to move together in response to solenoid actuation, allowing coordinated control of both valves through a single actuation mechanism. This merging approach enables precise control during normal operation (where CS valve remains closed) while reducing the complexity of requiring separate actuation systems for each valve.
Solution Approach 2:
The patent applies segmentation by dividing the valve system into distinct functional components - the main valve body for primary flow control and the CS valve body for auxiliary communication control. Each valve body can be independently designed and positioned, yet they move together as a coordinated unit when actuated. This segmentation allows for optimized control precision while maintaining manageable structural complexity through modular design.
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 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 CS valve body movement to manage pressures effectively, enhancing responsiveness and stability.
Implementation Method 1
a valve body moved in an axial direction by electromagnetic force which is generated in a solenoid when energization is controlled by a control computer
Implementation Method 2
when the suction pressure in the suction fluid supply chamber is high, since the pressure drive unit can be operated to assist the driving force of the solenoid
Data Source
AI summary
A capacity control valve includes: valve housings provided with a discharge port, a suction port, and a control port; and a main valve configured to open and close a communication between the discharge port and the control port as a rod driven by a solenoid moves. The capacity control valve further includes: a pressure drive unit disposed in a suction fluid supply chamber, operated by a suction pressure Ps, and coupled to the main valve body so as to be movable together; and a CS valve having a CS valve seat and a CS valve body to open and close a communication between the control port and the suction port. The CS valve body is movable relative to the main valve body. Upon the movement of the rod 83 in a closed state of the main valve, the main valve body and the CS valve body move together.