Magnetic-Drive Pump Containment With Secondary Leak Barrier
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Solution Overview
Problem
Magnetic-drive centrifugal pumps are prone to leakage and bursting due to exposure to excessive heat, hydraulic pressure, corrosive fluids, and particulate matter, posing health and safety risks from hazardous fluids.
Innovation Solution
A secondary containment system using non-metallic static barriers and magnetic couplings to create a sealed secondary containment area, isolating the drive motor from the primary containment area, with static seals and magnetic couplings to transmit mechanical energy without dynamic seals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a magnetic-drive centrifugal pump is used to pump hazardous fluids, then the pump can handle caustic and corrosive liquids, but the containment shell may leak or burst due to exposure to excessive heat, hydraulic pressure, and corrosive fluids
Solution Approach 1:
The patent implements a nested containment structure where a secondary containment shell is placed inside the primary containment shell. The secondary containment shell is positioned concentrically within the primary shell, creating a nested arrangement. This allows the pump to handle hazardous fluids while providing an additional barrier that prevents leakage to the environment if the primary containment shell fails due to corrosion, excessive pressure, or other degradation mechanisms.
2Use of energy by moving object
If dynamic seals are used to transmit mechanical energy from motor to pump, then energy transmission is achieved, but leakage may occur through the dynamic seals
Solution Approach 1:
The patent replaces dynamic mechanical seals with a magnetic coupling system. The magnetic coupling consists of magnetized components that transmit rotational force through the containment shell walls without physical contact or penetrating seals. This substitution eliminates the leakage pathway that would otherwise exist through dynamic seals, while still achieving the required mechanical energy transmission from the motor to the pump impeller.
3Adaptability or versatility
If the containment shell is exposed to corrosive fluids over time, then the pump can process hazardous materials, but the interior of the containment shell erodes and integrity degrades
Solution Approach 1:
The nested secondary containment shell provides an additional protective barrier that extends the service life of the containment system. When the primary containment shell interior erodes from corrosive fluid exposure, the secondary containment shell remains intact and continues to prevent hazardous fluid leakage, thereby extending the operational duration of the pump system.
Solution Approach 2:
The patent incorporates a monitoring system that detects the condition of the containment shells and provides feedback about their integrity. Sensors monitor for signs of corrosion, cracks, or degradation in both the primary and secondary containment shells, allowing for early detection and maintenance scheduling that prevents catastrophic failure and extends the effective service life of the containment system.
4Reliability
If static barriers are used to provide sealing, then leakage is prevented, but the device complexity increases with additional containment layers
Solution Approach 1:
While the nested containment structure does increase the number of containment layers, the patent designs the secondary containment shell to be integrated with the existing pump structure. The secondary shell is positioned within the existing pump housing space, and the magnetic coupling system is incorporated into the nested arrangement, thereby minimizing the increase in overall device complexity while maximizing leakage prevention capability.
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
Provides enhanced safety by containing leaks within a secondary containment area, reducing the risk of hazardous fluid exposure to the environment and allowing for early detection of leaks.
Implementation Method 1
a magnetic drive for providing a magnetic coupling across the first static barrier
Data Source
AI summary
Intermediate drives may provide containment for fluid handling devices, such as pumps. Such intermediate drivees may one or more utilize magnetic drives to provide static barriers for mechanical devices. A fluid handling assembly may include a fluid handling device comprising a housing, a housing cavity, a fluid inlet, and a fluid outlet. An intermediate drive may be positioned and configured to transmit energy from a motor to the fluid handling device while providing a secondary containment area that is separate from the primary containment area provided by the fluid handling device.