Dual Valve Seat Structure for Lower Solenoid Closing Force
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Solution Overview
Problem
The capacity control valve in air conditioning systems requires a significant driving force to close due to the strong opposing force from high fluid pressures, particularly when the valve opening is narrow, necessitating a solution to reduce the driving force required for closure.
Innovation Solution
A valve design featuring a primary pressure port and a secondary pressure port, with a second valve seat on the radially inner side of the first valve seat, moved by differential pressure to reduce the valve diameter when closed, thereby decreasing the drag force from the primary pressure, allowing closure with a smaller driving force. This design includes a movable body with a pressure-receiving surface for the secondary pressure and an urging member to improve responsiveness and prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the valve opening degree is narrowed to control fluid flow, then the control precision is improved, but the driving force required to close the valve increases due to strong opposing force from high fluid pressure
Solution Approach 1:
The valve seat is divided into a first valve seat and a second valve seat positioned at different radial locations. The second valve seat has a smaller diameter and is positioned on the radially inner side. This segmentation allows the valve to close at a smaller effective diameter, reducing the drag force from primary pressure while maintaining precise control capability through the dual-seat configuration.
Solution Approach 2:
The invention introduces a radial dimension to the valve seat configuration by positioning the second valve seat on the radially inner side of the first valve seat. This dimensional change enables the valve to utilize different radial positions for sealing, allowing closure at a smaller effective area and thereby reducing the force required to overcome fluid pressure.
2Force
If the valve diameter is reduced to decrease drag force, then the driving force required is reduced, but the sealing reliability may be compromised
Solution Approach 1:
The dual valve seat configuration provides multiple sealing surfaces at different radial positions. The second valve seat with smaller diameter reduces drag force for closure, while the first valve seat with larger diameter provides additional sealing capability. This segmentation ensures reliable sealing is maintained even when utilizing the smaller second valve seat for closure.
Solution Approach 2:
Different regions of the valve system are assigned different functions: the second valve seat on the radially inner side is optimized for reducing closure force with its smaller diameter, while the first valve seat on the radially outer side provides enhanced sealing capability. This local differentiation of quality allows the system to achieve both reduced driving force and maintained sealing reliability.
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 valve can be closed with a smaller driving force due to the reduced drag force from the primary pressure, enhancing the responsiveness and reliability of the valve operation while preventing fluid leakage.
Implementation Method 1
the second valve seat being configured for moving in a direction toward the valve body due to a differential pressure between a primary pressure and a secondary pressure
Implementation Method 2
a valve body is moved in an axial direction by electromagnetic force generated in a solenoid
Data Source
AI summary
A valve includes: a valve housing provided with a primary pressure port and a secondary pressure port; a valve body configured to be driven by a solenoid; a valve seat on which the valve body is seated; and a spring that urges the valve body in a valve opening direction. The valve seat includes a first valve seat and a second valve seat disposed on a radially inner side of the first valve seat. The second valve seat is configured for moving in a direction toward the valve body due to a differential pressure between a primary pressure and a secondary pressure.