Flow Control Valve Nonmagnetic Flared Pipe Adherence Prevention
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Solution Overview
Problem
Conventional flow control valves face issues with the movable core adhering to the fixed core during full opening, leading to deteriorated proportional control and reduced attractive force, which affects sealing strength and accuracy in flow control.
Innovation Solution
A flow control valve design featuring a nonmagnetic flared pipe with a cylindrical part and disc, a movable core with a flange of larger diameter, and an adjustable spring urging mechanism, preventing adherence and enhancing attractive force through optimized magnetic flux area and adjustable spring load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the movable core and fixed core are designed with tapered facing portions to increase the linear stroke range, then the proportional control range is improved, but the movable core adheres to the fixed core during full opening
Solution Approach 1:
The patent extracts the harmful magnetic attraction effect by introducing a nonmagnetic material (such as plastic or ceramic) between the movable core and fixed core at their facing portions. This nonmagnetic layer prevents magnetic flux from directly coupling the two cores, thereby eliminating the adherence problem while preserving the tapered geometry needed for proportional control.
Solution Approach 2:
A nonmagnetic intermediary material is placed between the movable core and fixed core to mediate their interaction. This intermediary prevents direct magnetic attraction while allowing the mechanical structure to maintain the desired tapered facing portions for linear stroke control.
2Length of moving object
If the movable core and fixed core are designed with tapered facing portions, then the linear stroke range is increased, but the attractive force of the fixed core decreases
Solution Approach 1:
The patent applies different properties to different parts of the core structure. The facing portions have tapered geometry for proportional control but are separated by nonmagnetic material to prevent adherence, while other portions of the cores maintain full magnetic properties to generate sufficient attractive force for valve operation.
Solution Approach 2:
The harmful magnetic attraction at the tapered facing portions is extracted by removing the magnetic flux path through the use of nonmagnetic material, while preserving the geometric taper for stroke control. This allows the rest of the core structure to maintain full magnetic coupling for force generation.
3Force
If the attractive force of the fixed core is increased to improve valve opening operation, then the sealing strength during valve closed condition decreases
Solution Approach 1:
The patent employs a spring mechanism that dynamically adjusts the position of the movable core. During valve opening, the electromagnetic attractive force overcomes the spring force to open the valve. During valve closed condition, the spring maintains optimal contact pressure between the valve element and seat, ensuring sealing strength while allowing the electromagnetic force to be sufficiently strong for opening.
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 prevents adherence between the fixed and movable cores, increases attractive force, and enhances proportional control accuracy, allowing for precise flow control with improved sealing and reduced hysteresis.
Implementation Method 1
When the fluid flowing in the flow control valve 210 through the inlet passage 234 is allowed to flow from the inlet passage 234 to the outlet passage 235, the coil 222 is energized to excite the fixed core 223. The excited fixed core 223 attracts the movable core 224 to move against the urging force of the spring 225
Implementation Method 2
An end of the movable core 224 is provided with a valve element 231 and attached with a spring 225. This spring 225 urges the movable core 224 downward.
Data Source
AI summary
The invention has been made to provide a flow control valve capable of preventing adhesion between a fixed core and a movable core and increasing an attractive force, so that flow control can be performed with high accuracy. In a flow control valve 10, a first fixed core 23a is fixed in an upper part of a coil bobbin 21, a second fixed core 23b is fixed in a lower part of the coil bobbin 21, and the movable core 24 is formed at its lower end with a flange 24a having a diameter larger than an inner diameter of the coil bobbin 21. The movable core 24 is placed inside a cylindrical part 28a of the flared pipe 28 so that a distance D1 between the first fixed core 23a and the movable core 24 is larger than a distance D2 between the flange 24a and a disc part 28b of the flared pipe 28.