Solenoid Valve Core Gap Control With Rotation-Preventing Spring
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Solution Overview
Problem
Conventional solenoid valves experience reduced operation accuracy due to variations in the size of the gap between the umbrella-shaped movable core and the coil, leading to inconsistent suction speed and timing accuracy.
Innovation Solution
The solenoid valve incorporates a compression coil spring with rotation-preventing features and spacers to stabilize the movement of the umbrella-shaped movable core, ensuring precise dimensional accuracy and preventing rotation, along with integrally molded seal members to maintain consistent gap sizes and reduce deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the gap size between the umbrella-shaped movable core and the coil is allowed to vary, then the device complexity is reduced, but the operation accuracy deteriorates due to inconsistent suction speed
Solution Approach 1:
The patent applies parameter changes by introducing a spacer component that precisely controls the gap distance between the umbrella-shaped movable core and the coil. This spacer maintains a constant gap size, ensuring consistent suction speed and operation accuracy without requiring complex adjustment mechanisms. The spacer transforms the variable gap parameter into a fixed, controlled dimension.
Solution Approach 2:
The spacer acts as an intermediary component between the umbrella-shaped movable core and the coil, mediating the gap distance. This intermediary element ensures consistent spacing without requiring direct precision manufacturing between the core and coil, thereby maintaining operation accuracy while keeping the overall device structure relatively simple.
2Measurement precision
If fine adjustments are implemented to maintain consistent gap sizes, then the operation accuracy is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of implementing complex fine adjustment mechanisms, the patent changes the approach by using a spacer with a predetermined fixed dimension. This spacer is designed with the exact gap size required for optimal operation, eliminating the need for post-assembly adjustments while maintaining high operation accuracy and simplifying the manufacturing process.
Solution Approach 2:
The gap distance is determined in advance during the spacer manufacturing process rather than requiring adjustment after assembly. The spacer is pre-formed with the precise gap dimension, and this preliminary action ensures consistent operation accuracy without adding complexity to the final assembly or requiring skilled adjustment procedures.
3Ease of operation
If rotation of the umbrella-shaped movable core is permitted, then the ease of operation is improved, but the suction speed consistency deteriorates due to varying gap sizes
Solution Approach 1:
The patent introduces asymmetry by providing rotation prevention protrusions on the spacer that engage with corresponding features on the umbrella-shaped movable core. This asymmetric feature selectively restricts rotational movement while allowing the necessary linear reciprocating motion, thereby maintaining gap size consistency without completely constraining the core's operational movement.
Solution Approach 2:
The patent changes the degrees of freedom parameter of the umbrella-shaped movable core by introducing rotation prevention features. The core is allowed to move linearly along the axis for opening and closing operations, but rotational movement is prevented. This parameter change ensures consistent gap size between the core and coil while maintaining ease of linear operation.
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 configuration enhances the stability and accuracy of the solenoid valve's opening and closing operations, maintaining consistent characteristics across multiple units without the need for fine adjustments, thereby improving overall operation precision.
Implementation Method 1
an electromagnetic coil configured to attract the umbrella-shaped movable core, for operating by being energized by the electromagnetic coil so as to open the opening of the seal member by attracting the umbrella-shaped movable core
Implementation Method 2
a first spring configured to bias the valve body against the seal member so as to close the opening of the seal member
Implementation Method 3
a second spring configured to exert, on the umbrella-shaped movable core, a spring force weaker than a spring force of the first spring in a direction opposite to a biasing direction of the first spring
Data Source
AI summary
A solenoid valve includes an inlet port, an outlet port, a seal member arranged in a channel of a fluid between the inlet port and the outlet port and having an opening, a valve body configured to open and close the opening of the seal member, a first spring configured to bias the valve body against the seal member, electromagnetic driving device, including an umbrella-shaped movable core configured to move the valve body and an electromagnetic coil configured to attract the umbrella-shaped movable core, for operating so as to open the opening of the seal member by attracting the umbrella-shaped movable core, and a second spring configured to exert a spring force in a direction opposite to the first spring, wherein the second spring is provided with rotation preventing device.