Measurement Device With Concave Casing for Magnetic Rotation Detection
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Solution Overview
Problem
Conventional measurement devices face challenges in maintaining adequate waterproof and dustproof properties due to the presence of holes for setting changing mechanisms, which can lead to failures in harsh environments.
Innovation Solution
A measurement device design featuring a concave portion in the casing for the shaft insertion, with a gasket and lid to prevent water and dust ingress, and a magnetic sensor system to detect shaft rotation without penetrating holes, ensuring reliable waterproof and dustproof properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hole is formed in the casing to allow shaft penetration for setting changes, then the setting changing mechanism can be operated, but waterproof and dustproof properties deteriorate
Solution Approach 1:
The patent extracts the shaft from the interior space of the casing by forming a concave portion that receives the shaft externally. The shaft is positioned in the concave portion without penetrating through the casing, allowing setting changes to be made by rotating the shaft from the outside while maintaining the integrity of the casing for waterproof and dustproof protection.
Solution Approach 2:
The concave portion acts as an intermediary structure that receives the shaft and allows rotational operation without requiring the shaft to penetrate through the casing. This intermediate structure enables the setting changing function while preserving the sealing properties of the casing.
2Reliability
If a gasket is used to seal the shaft in a through-hole, then some waterproof protection is achieved, but adequate waterproof and dustproof properties cannot be ensured in harsh environments
Solution Approach 1:
The patent eliminates the need for shaft penetration through the casing by providing a concave portion that receives the shaft externally. This removes the vulnerability point where water and dust could ingress through the through-hole, even with gasket sealing.
Solution Approach 2:
The patent uses a gasket in the concave portion to provide flexible sealing around the shaft where it is received, preventing water and dust ingress while allowing rotational movement. The gasket compensates for manufacturing tolerances and maintains sealing effectiveness.
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 achieves enhanced waterproof, dustproof, and explosion-proof properties while allowing seamless operation and downsizing of the device, with simplified assembly and the ability to make precise setting changes.
Implementation Method 1
a magnetic sensor that detects a change in a magnetic field when the shaft rotates
Data Source
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AI summary
A measurement device includes a casing in which a storage space is formed thereinside; a board that has a mounting surface, and that is housed in the storage space; a magnetic sensor mounted on the mounting surface; and a detecting unit that is arranged outside the casing, and that detects a state quantity of a measured medium. A protruding portion that is formed by protruding an inner circumferential surface of the storage space is formed in the casing. A concave portion formed by recessing toward the storage space from an outer circumferential surface of the casing is formed in the protruding portion. The board is arranged such that the mounting surface faces the protruding portion.