Capacitive Liquid Leak Detection for Pumps
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Solution Overview
Problem
Existing pumps, particularly hydraulic and electric boosters, face challenges in detecting oil leakage efficiently, which can lead to reduced performance and potential damage if not addressed promptly.
Innovation Solution
A leak detection system comprising a buffer tube to collect leaked fluid and a sensor to detect the fluid level, triggering an alarm when the leaked fluid reaches a threshold, along with a purge line to remove excess fluid, ensuring timely maintenance and preventing operational issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal is used to prevent drive fluid from entering the pump chamber, then the separation between drive fluid and working fluid is improved, but oil leakage may occur due to worn seals or cracks in the casing
Solution Approach 1:
The patent implements a leak detection system with a buffer tube and sensor that monitors for drive fluid leakage before it causes significant harm. The system proactively detects leakage through capacitive sensing and triggers alarms or shutdowns in advance, preventing the worsening of seal issues and potential damage to the pump system.
Solution Approach 2:
The buffer tube serves as an intermediary component that collects and contains leaked drive fluid, preventing it from directly contaminating the pump chamber or working fluid. The capacitive sensor acts as another intermediary, providing early detection of leakage without requiring direct contact with the seal interface.
2Reliability
If continuous monitoring of drive fluid levels is implemented, then leakage detection reliability is improved, but device complexity increases due to additional sensors and control systems
Solution Approach 1:
The patent replaces complex mechanical level sensing mechanisms with a capacitive sensor that uses electrical fields to detect drive fluid levels. This substitution maintains high detection reliability while significantly reducing mechanical complexity, as capacitive sensors have no moving parts and can be integrated into existing pump structures.
Solution Approach 2:
The control system is designed to perform multiple functions: monitoring capacitive sensor signals, determining leakage conditions, triggering alarms, and potentially coordinating with purge systems. This multi-functionality consolidates what could be multiple separate systems into a single integrated control unit, reducing overall device complexity while maintaining comprehensive monitoring capability.
3Measurement precision
If a buffer tube with sensor is used to detect leaked fluid, then detection precision is improved, but the device complexity increases due to additional components
Solution Approach 1:
The buffer tube is designed as a simple, thin-walled component that provides sufficient isolation while allowing capacitive sensing through its walls. This flexible, minimalistic design achieves precise fluid level detection without requiring complex thick-walled or multi-layered structures, thereby maintaining low device complexity while ensuring measurement precision.
4Productivity
If the pump operates continuously without leak detection, then productivity is maintained, but undetected leakage can lead to efficiency loss or damage over time
Solution Approach 1:
The pump system performs self-monitoring through the integrated capacitive sensor and control system that automatically detect drive fluid leakage conditions. The system can trigger alarms or shutdowns without external intervention, allowing continuous operation under normal conditions while automatically protecting against leakage-induced damage, thus maintaining both productivity and 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 system effectively detects oil leaks in pumps, allowing for timely maintenance and preventing efficiency loss or damage by alerting operators when the leakage reaches a critical level, thus ensuring continuous operation and extending the lifespan of the equipment.
Implementation Method 1
a capacitive sensor that detects when the leaked fluid reaches a predetermined level within the buffer tube
Data Source
AI summary
A liquid leak detector for a pump is described. The liquid leak detector is mountable on a pump to detect leaked fluid coming from the pump. The leak detector includes a buffer tube positioned on the pump to collect a leaked fluid from the pump and a sensor positioned on the buffer tube to detect the level of leaked fluid in the buffer tube and to generate a signal when the leaked fluid reaches a maximum fluid level. A purge line on the buffer tube removes leaked drive fluid from the buffer tube once the leaked drive fluid reaches a maximum level. Logic connected to the sensor receives the signal from the detector and generates an alarm.