Magnetic Float Position Sensor With Impact-Absorbing Contact Rod
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Solution Overview
Problem
Existing position detection sensors in liquid pumping devices face accuracy issues due to impact damage and deformation, which causes the contact part to deviate from the center of the float, leading to decreased detection precision.
Innovation Solution
A position detection sensor design featuring a rod-shaped contact part with a columnar outer member and a rod-shaped inner member, where the outer member is elastically deformable and the inner member has a higher elastic modulus, preventing damage and maintaining pivot accuracy by absorbing impacts and suppressing warpage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coil spring is used as the contact part to absorb impact, then damage to the contact part is prevented, but the contact part deviates from the center of the float after deformation, decreasing position detection accuracy
Solution Approach 1:
The contact part is divided into two distinct segments: an outer member (coil spring) for impact absorption and an inner member (rod-shaped) for maintaining positional accuracy. This segmentation allows each component to perform its specialized function without compromising the other.
Solution Approach 2:
The contact part uses a composite structure combining two different elastic members with different properties. The outer member has elasticity for cushioning, while the inner member has higher elastic modulus for structural stability, creating a composite system that achieves both impact resistance and measurement precision.
2Measurement precision
If a rigid rod is used as the contact part to maintain detection accuracy, then position detection accuracy is improved, but the contact part suffers damage from impact when the float abruptly rises
Solution Approach 1:
The outer member (coil spring) is positioned beforehand to absorb impact forces before they can reach and damage the inner member. This preemptive cushioning protects the precision component while allowing it to maintain its rigid structure for accurate detection.
Solution Approach 2:
The composite structure combines a rigid inner member for accuracy with a flexible outer member for protection, allowing the system to simultaneously achieve both high measurement precision and impact resistance that neither component could achieve alone.
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 effectively prevents damage and maintains position detection accuracy by absorbing impacts and ensuring the contact part remains centered, enhancing the durability and reliability of the sensor.
Implementation Method 1
The outer member has elasticity and constitutes an outer peripheral portion of the contact part
Implementation Method 2
the proximity switch is configured to sense a presence of the movable part and detect a position of the object when the movable part moves to approach a predetermined distance
Data Source
AI summary
A position detection sensor includes a rod-shaped contact part having a distal end and a proximal end, the contact part being configured such that an outer peripheral surface thereof at the distal end contacts an object and the contact part pivots about the proximal end in accordance with displacement of the object; a movable part configured to move with a pivot of the contact part; and a magnetic switch configured to sense a presence of the movable part and detect a position of the object when the movable part moves to approach a predetermined distance. The contact part is elastic and includes a columnar outer member constituting an outer peripheral portion of the contact part and a rod-shaped inner member inserted in the outer member and having an elastic modulus larger than that of the outer member.