Magnetic Drive Pump Leak Detection via Capacitive Sensor
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Solution Overview
Problem
Conventional pumps used in chemical processing equipment fail to detect leaks in the inner lining, allowing chemical liquids to leak into the outer rotor and cause corrosion, leading to malfunction.
Innovation Solution
A pump design incorporating a seat unit, motor unit, and a leak detector with a capacitive proximity sensor that detects changes in electrostatic capacity between a liquid-receiving space and the sensor, alerting for leakage and preventing exposure to corrosive chemicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner lining is made of fluoroplastic material to prevent corrosion, then corrosion resistance is improved, but leak detection capability deteriorates
Solution Approach 1:
A liquid-receiving space is introduced as an intermediary between the inner lining and outer rotor. This space collects leaked chemical liquids before they reach the motor unit, and the leak detector monitors this space to provide early warning of leaks without requiring direct contact with the corrosive chemicals.
Solution Approach 2:
The leak detection mechanism replaces mechanical inspection methods with a capacitive sensor that detects changes in electrostatic capacity. When chemical liquid enters the liquid-receiving space, it alters the capacitance between the sensor and the liquid, providing an electrical signal for leak detection without mechanical contact.
2Strength
If the double-layered structure is used to reinforce the rear cover, then structural strength is improved, but leak detection capability deteriorates
Solution Approach 1:
The liquid-receiving space acts as an intermediary layer between the double-layered rear cover structure and the motor unit. It utilizes the structural strength of the reinforced rear cover while providing a separate monitoring zone that enables leak detection without compromising the integrity of the double-layered structure.
3Device complexity
If no leak detector is installed to simplify the pump structure, then device complexity is reduced, but reliability deteriorates due to undetected leaks
Solution Approach 1:
A capacitive proximity sensor is used to detect leaks through electrical field changes rather than mechanical means. The sensor monitors the liquid-receiving space by detecting changes in electrostatic capacity when chemical liquid is present, providing a simple yet reliable detection mechanism that does not require complex mechanical inspection systems.
Solution Approach 2:
The pump system performs self-diagnosis through the leak detector that continuously monitors the liquid-receiving space. The system automatically detects leaks and can trigger alerts or shutdowns without requiring external inspection, enabling the pump to monitor its own health status and maintain reliability.
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 pump effectively detects leaks and prevents chemical corrosion, ensuring the motor unit does not malfunction by collecting leaked liquids and alerting users or ceasing operation when leakage is detected.
Implementation Method 1
a sensor for detecting the change of the electrostatic capacity between the liquid-receiving space and the sensor
Data Source
AI summary
A pump includes a seat unit, a motor unit and a leak detector. The motor unit includes a rotor, an inner case body, an outer case body and a stator. The inner case body has an inner end wall. The outer case body is sleeved on the inner case body and has an outer end wall. The outer end wall cooperates with the inner end wall to define a liquid-receiving space therebetween. The leak detector is disposed on one side of the outer end wall opposite to the liquid-receiving space and includes a sensor for detecting the change of the electrostatic capacity between the liquid-receiving space and the sensor.