Solenoid Capacity Control Valve Layout for Faster CS Valve Response
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Solution Overview
Problem
The responsiveness of the CS valve element in existing capacity control valves is decreased due to the drag force applied by the control pressure when the solenoid is driven, which affects the valve's ability to operate immediately.
Innovation Solution
A capacity control valve design that includes a CS valve element driven by a solenoid, a CS valve seat, and a biasing member to reduce drag force by allowing suction fluid with lower pressure to flow into a space opposite the solenoid, enabling immediate operation of the CS valve element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the Pc port is disposed in the solenoid driving direction and control pressure flows through it, then the valve structure is simplified, but the responsiveness of the CS valve element decreases due to drag force
Solution Approach 1:
The patent divides the valve body into separate functional sections: a suction fluid supply chamber and a control fluid supply chamber. The suction port and control port are positioned at different locations, creating distinct flow paths. This segmentation allows the suction fluid to enter from one side while control pressure acts from the other side, eliminating the drag force problem while maintaining structural simplicity.
Solution Approach 2:
The patent changes the spatial arrangement by positioning the suction port and control port in different dimensional locations within the valve body. Instead of having both ports aligned in the solenoid driving direction (one-dimensional arrangement), the suction port is positioned laterally opposite to the solenoid, creating a two-dimensional or three-dimensional spatial separation. This dimensional change allows independent optimization of both structural simplicity and valve responsiveness.
2Reliability
If the CS valve element is made larger to improve sealing, then sealing performance improves, but the drag force from control pressure increases
Solution Approach 1:
The patent inverts the traditional pressure application arrangement by having suction pressure (lower pressure) act on one side of the CS valve element and control pressure (higher pressure) act on the other side. This inversion creates a pressure balance where the lower suction pressure counteracts part of the control pressure, reducing the net drag force on the valve element while allowing the valve to maintain adequate sealing performance.
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 reduces the drag force on the CS valve element, allowing it to operate promptly and maintain a compact size, while also simplifying the structure and ensuring reliable operation by partitioning the space and control port effectively.
Implementation Method 1
a valve element which is axially driven by a solenoid
Implementation Method 2
since the suction fluid having a pressure lower than that of the control fluid flows into the space on the side opposite to the solenoid which is on the solenoid driving direction side in relation to the CS valve element, a drag force applied to the CS valve element at the time of driving the solenoid can be decreased
Data Source
AI summary
A capacity control valve includes: a valve housing provided with a suction port through which a suction fluid of a suction pressure passes and a control port through which a control fluid of a control pressure passes; a CS valve that includes a CS valve element which is axially driven by a solenoid and a CS valve seat provided between the suction port and the control port and is brought into contact with and separated from the CS valve element; and bias means for biasing the CS valve element in a valve closing direction of the CS valve, wherein a space is formed inside the valve housing in opposition to the solenoid through the CS valve element and the suction fluid flows into the space.