Magnetic Drive Pump Leak Detection via Capacitive Sensor
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Solution Overview
Problem
Conventional magnetic drive pumps used in chemical processing equipment fail to detect leaks in the inner lining, allowing chemical liquids to corrode the outer rotor and cause malfunctions due to the lack of a detection mechanism.
Innovation Solution
Incorporation of a leak detector with a capacitive proximity sensor that detects changes in electrostatic capacity between a liquid-receiving space and the sensor, which alerts users to potential leaks and prevents corrosion by collecting leaked chemicals in a defined space within the pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional magnetic drive pump is used without a leak detection mechanism, then the pump structure remains simple, but chemical liquid leaks cannot be detected allowing corrosion of the outer rotor and malfunction
Solution Approach 1:
The leak detector is nested within the motor unit structure, with the sensor integrated into the outer case body. The liquid-receiving space is formed by structural features within the existing motor unit components, creating a compact nested arrangement that adds detection functionality without significantly increasing overall device complexity
Solution Approach 2:
A liquid-receiving space is introduced as an intermediary structure between the inner case body and outer case body. This space collects leaked chemical liquid and prevents it from reaching the stator, serving as a protective mediator that enhances reliability while maintaining structural simplicity
2Productivity
If the inner lining is damaged allowing chemical liquid to leak, then the pump continues operating without interruption, but the chemical liquid corrodes the outer rotor and stator causing malfunction
Solution Approach 1:
The leak detector with sensor is pre-installed to detect leaks before they cause corrosion damage. The liquid-receiving space is pre-configured to collect and contain leaked chemical liquid, preventing it from reaching and corroding the stator and outer rotor, thus enabling continuous operation without malfunction
Solution Approach 2:
The liquid-receiving space acts as a cushioning structure that intercepts and contains leaked chemical liquid before it can cause harmful corrosion effects on critical components. This preliminary protective measure allows the pump to maintain continuous operation by preventing corrosion damage in advance
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
Prevents pump malfunction by detecting chemical leaks and alerting users or ceasing operation, thereby protecting the stator from corrosion and ensuring continuous operation.
Implementation Method 1
a sensor for detecting a change in electrostatic capacity between the liquid-receiving space and the sensor
Data Source
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AI summary
A magnetic drive pump (1) includes a motor unit (3) and a leak detector (4). The motor unit (3) includes an inner case body (32) and an outer case body (33). The inner case body (32) has an inner end wall (322) . The outer case body (33) is sleeved on the inner case body (32) and has an outer end wall (332). The outer end wall (332) cooperates with the inner end wall (322) to define a liquid-receiving space (337) therebetween. The leak detector (4) is disposed on one side of the outer end wall (332) opposite to the liquid-receiving space (337) and includes a sensor (41) for detecting a change in electrostatic capacity between the liquid-receiving space (337) and the sensor (41).