Magnetic Valve Position Detection Under Piston Inclination
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Solution Overview
Problem
Existing valve detection systems face accuracy issues when the piston is inclined, leading to potential detection failures, especially with small piston displacement, which affects the accuracy of opening and closing operations.
Innovation Solution
A valve design incorporating a ring-shaped magnetic body fixed by an elastic member on the stem, with a magnetic sensor detecting changes in the magnetic field, and an actuator cap with a pressure chamber and sensor cap for accurate detection, including an inclined part for secure attachment and enhanced detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detection is performed based on piston movement, then valve operation detection is achieved, but detection accuracy deteriorates when piston is inclined or displacement is small
Solution Approach 1:
The patent replaces the mechanical detection system (detection switch detecting physical contact with piston) with a magnetic detection system. A magnetic body is attached to the stem, and a magnetic sensor detects changes in magnetic field strength as the stem moves vertically. This substitution eliminates the need for direct mechanical contact, allowing accurate detection even when the piston is inclined or has small displacement, as the magnetic field changes remain detectable along the vertical axis regardless of piston orientation.
2Ease of operation
If detection switch and indication member are used, then valve operation detection is achieved, but detection accuracy is affected by piston inclination and small displacement
Solution Approach 1:
The patent replaces the mechanical indication member and detection switch system with a magnetic sensor system. The magnetic sensor non-contactively detects the position of the magnetic body attached to the stem by measuring magnetic field strength changes. This eliminates mechanical wear and positioning errors, providing both ease of operation and high detection accuracy independent of piston inclination or displacement magnitude.
3Measurement precision
If magnetic sensor detects magnetic field changes, then high-accuracy detection is achieved, but device complexity increases due to additional components
Solution Approach 1:
The magnetic body serves multiple functions: it acts as a permanent magnet generating the magnetic field for detection, and simultaneously serves as a position indicator whose movement relative to the magnetic sensor indicates stem position. This multi-functionality reduces the need for separate components, achieving high detection accuracy while minimizing the increase in device complexity.
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 solution enables high-accuracy detection of valve operations, preventing detection failures and ensuring precise monitoring of valve opening and closing operations, even when the piston is inclined.
Implementation Method 1
a magnetic sensor detecting a change in a magnetic field of the magnetic body
Data Source
AI summary
A valve which can accurately detect an operation of the valve is provided.The valve includes a valve body defining a fluid flow passage, a valve disk operating to be able to open and close the fluid flow passage, an actuator driving the valve disk by supplying or interrupting a working fluid, a stem transmitting a driving force of the actuator to the valve disk, a detection means detecting an opening and closing operation of the valve disk, and an elastic member fixing a ring-shaped magnetic body inserted through an end of the stem to the stem. The detection means includes the magnetic body fixed by the elastic member, and a magnetic sensor detecting a change in a magnetic field of the magnetic body.