Centrifugal Pump Seal Leakage Detection
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Solution Overview
Problem
Multi-stage centrifugal pumps face challenges in achieving tightness at high pressure areas, leading to increased friction and reduced efficiency and seal life, as existing mechanical seals struggle to balance leakage prevention with operational efficiency.
Innovation Solution
A ring-shaped container is placed around the shaft to collect and monitor liquid leakage through the seal, using electrically insulated contacts to detect fluid presence and level, allowing for controlled leakage and early detection of seal wear, thereby reducing friction and extending seal life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact pressure of the seal is increased to prevent liquid escape, then sealing tightness is improved, but frictional forces increase and efficiency decreases
Solution Approach 1:
The patent applies partial action by intentionally allowing a small, controlled amount of liquid to pass through the seal rather than achieving complete tightness. This controlled leakage is monitored by the detection system, which enables the seal to operate at lower contact pressure, thereby reducing frictional forces and improving efficiency while maintaining acceptable sealing performance.
2Reliability
If the sealing gap is reduced to prevent liquid escape, then sealing tightness is improved, but frictional forces increase and wear accelerates
Solution Approach 1:
The patent intentionally allows partial liquid passage through the seal rather than achieving complete tightness. This controlled leakage is monitored by the detection system, enabling the seal to operate with reduced friction and wear, thereby extending seal service life while maintaining acceptable sealing performance.
Solution Approach 2:
The patent incorporates a detection system with electrical contacts that monitor liquid passage through the seal. This feedback mechanism detects when liquid begins to pass through the sealing gap, providing early warning of seal wear. The system enables proactive maintenance before complete seal failure occurs, extending the effective service life of the seal.
3Reliability
If complete tightness is achieved through high contact pressure, then liquid escape is prevented, but efficiency decreases due to increased friction
Solution Approach 1:
The patent deliberately accepts partial liquid passage through the seal rather than achieving complete tightness. The detection system monitors this controlled leakage, allowing the seal to operate at optimal contact pressure that balances sealing performance with minimal friction, thereby maintaining high pump efficiency.
4Reliability
If the seal is designed for complete tightness, then liquid escape is minimized, but detection of seal wear becomes more difficult
Solution Approach 1:
The patent incorporates a feedback-based detection system with electrical contacts positioned to detect liquid passage through the seal. As the seal wears and liquid begins to pass through the sealing gap, the liquid conducts electricity between the contacts, triggering an alarm signal. This feedback mechanism provides early warning of seal wear while the seal maintains complete tightness during normal operation.
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 solution enables efficient operation by reducing frictional forces, increasing seal life, and providing reliable function monitoring, applicable to various types of seals, including mechanical and O-rings, while allowing a controlled amount of leakage to maintain pump efficiency.
Implementation Method 1
at least two contacts which are electrically insulated from one another and which are electrically conductively connected by the liquid are provided
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The centrifugal pump has an impeller that is rotatably mounted on a shaft, which is sealed off by seal (11) to a surrounding housing. The seal is opened towards a container (12) for the collection of the fluid, and is configured to detect fluid in or out of the container. The container is annular and is configured to surround the shaft. A sensor (20) configured for detecting the flow rate of drops. A discharge opening is followed by the tubes (21,22) formed by the sensor whose other end is open to the outside or to a discharge line.