Electromagnetic Valve Fluid Flow Stabilization
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Solution Overview
Problem
Electromagnetic valves experience unstable fluid flow between the valve seat surface and valve body, leading to operation noise and variability in performance due to uncertain fluid flow paths and interference with return springs, which affects controllability.
Innovation Solution
The valve body design features a larger diameter semi-spherical seal portion and a diameter expanding portion, ensuring fluid flows along the valve seat surface instead of the valve body, reducing noise and stabilizing performance by avoiding unnecessary force on return springs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the valve body has a tapered surface extending continuously from the semi-spherical distal end face, then fluid flows along the tapered surface of the valve body, but fluid may be separated from the valve body and flow along the valve seat surface due to attraction towards both surfaces
Solution Approach 1:
The valve body is segmented into distinct functional zones: a semi-spherical distal end face for sealing, a cylindrical intermediate portion with specific diameter relationships, and a stem portion. This segmentation creates clear flow path guidance that prevents uncertain fluid behavior between surfaces.
Solution Approach 2:
Different portions of the valve body have locally optimized geometries: the semi-spherical distal end face provides smooth sealing contact, while the cylindrical portion with controlled diameter ratios creates specific flow attachment conditions. This local quality optimization ensures reliable fluid flow along the intended path.
2Ease of manufacture
If the valve body has a smoothly connected stem portion to the semi-spherical distal end, then manufacturing is easier, but fluid flow path becomes uncertain between valve body and valve seat surface
Solution Approach 1:
Specific diameter parameters are defined to control fluid flow behavior: the cylindrical portion has a diameter larger than the stem portion but controlled relative to the valve seat surface diameter. This parameter optimization creates stable flow attachment without requiring complex smooth transitions, balancing manufacturability with flow stability.
3Quantity of substance
If fluid flows along the valve body to the return spring portion, then the return spring is subjected to fluid force, but the controllability of the electromagnetic valve is worsened
Solution Approach 1:
The harmful fluid force acting on the return spring is extracted/eliminated by designing the flow path to detach from the valve body before reaching the spring portion. The cylindrical geometry with controlled diameter ratios ensures fluid flows along the valve seat surface instead, protecting the return spring from destabilizing forces.
4Reliability
If the diameter of the end portion of the semi-spherical seal portion is larger than the stem portion, then a difference in level is formed to separate fluid flow from the valve body, but the valve body structure becomes more complex
Solution Approach 1:
The semi-spherical distal end face provides natural curvature for smooth fluid flow and sealing. By combining this spherical geometry with a cylindrical portion of controlled diameter, the design achieves flow separation and stability without requiring complex shaped transitions, maintaining structural simplicity while ensuring reliable 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
This design stabilizes fluid flow, suppresses operation noise, and enhances controllability by ensuring consistent fluid path alignment with the valve seat surface, reducing the impact of minor production errors and maintaining performance stability.
Implementation Method 1
an electromagnetic valve is configured to have a coil, a fixed core and a movable core and generates a magnetic field by an electric current being caused to flow through the coil so as to attract the movable core towards the fixed core
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
An electromagnetic valve (1) has a fixed core (3), a movable core (7), a coil (4) attract the fixed core (3) and the movable core (7) each other, a valve body (5) and a valve seat member (6) including a funnel-shaped valve seat surface (61) and an inlet path (62). The flow path is closable by retreat/advance of the valve body (5) relative to the valve seat surface (61). The valve body (5) includes a semi-spherical seal portion (51) and a stem portion (52) extending from the seal portion (51) towards the movable core (7), a diameter of an end portion (53) of the seal portion (51) at the stem portion (52) side is larger than a diameter of an end portion of the stem portion (52) at the seal portion side (51). A space (84) is defined in an area located on an extended line extending from a small diameter end portion to a large diameter end portion of the valve seat surface (61).