Capacity Control Valve Slide Valve for Refrigerant Bypass Control
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Solution Overview
Problem
The existing capacity control valve configuration for variable displacement compressors leads to increased refrigerant circulation and decreased operating efficiency during continuous operation due to the auxiliary communication passage allowing refrigerant flow from the control port into the suction port at start-up.
Innovation Solution
A capacity control valve design featuring a pressure-sensitive valve member with an intermediate communication passage and a slide valve body that opens to connect the control port and suction port at start-up, and closes during normal operation to prevent refrigerant flow, utilizing a biasing device to ensure quick pressure reduction and maintain efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an auxiliary communication passage is formed to provide communication between control port and suction port for rapid pressure reduction at start-up, then the responsiveness of the variable displacement compressor is improved, but the refrigerant circulation amount increases and operating efficiency decreases during continuous operation
Solution Approach 1:
The patent applies a slide valve body that can dynamically change position between open and closed states. During start-up, the slide valve body is in the open position allowing communication between control port and suction port for rapid pressure reduction. During continuous operation, the slide valve body moves to the closed position to prevent refrigerant flow through the auxiliary communication passage, thereby eliminating energy loss while maintaining responsiveness capability when needed.
2Speed
If the auxiliary communication passage remains open during continuous operation to maintain quick pressure reduction capability, then responsiveness is maintained, but refrigerant flows continuously from control port to suction port causing increased circulation and decreased efficiency
Solution Approach 1:
The patent segments the flow control function into two separate controllable elements: the main valve for primary flow control and the slide valve body for auxiliary communication control. This segmentation allows independent control of the auxiliary communication passage, enabling it to be opened only when needed for rapid pressure reduction and closed during normal operation to prevent unnecessary refrigerant circulation.
3Speed
If the slide valve body is made lightweight for quick response, then responsiveness is improved, but the biasing force required to open the through-hole increases
Solution Approach 1:
The patent employs a biasing device that pre-applies opening force to the slide valve body, preparing it for rapid movement when pressure differential occurs. This preliminary action ensures that during start-up or maximum capacity operation, the slide valve body can quickly respond and open the through-hole without requiring excessive force, as the biasing device has already positioned it favorably for rapid actuation.
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 design enhances the fluid discharge function at start-up and improves the operating efficiency of the variable displacement compressor by controlling refrigerant flow effectively, reducing circulation and maintaining high responsiveness.
Implementation Method 1
a valve body driven by a solenoid
Implementation Method 2
A biasing device that biases the slide valve body in an opening direction is provided
Data Source
AI summary
A capacity control valve includes a valve housing; a main valve including a valve body driven by a solenoid, and a main valve seat between a discharge port and a control port and with which the valve body is contactable; and a pressure sensitive valve member disposed in a pressure sensitive chamber and forming a pressure sensitive valve, together with a pressure sensitive body. The control port and a suction port communicate with each other through an intermediate communication passage by opening the pressure sensitive valve. The pressure sensitive valve member has a through-hole communicating with the intermediate communication passage and has a slide valve body attached thereto such that the slide valve body slides relative to the pressure sensitive valve member to open and close the through-hole. A biasing device is provided on a radially outer side of the slide valve body.