Magnetic Drive Liquid Ring Pump Corrosion Resistance
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Solution Overview
Problem
Liquid ring pumps face challenges when handling corrosive effluent gas streams that react with or are soluble in the service liquid, leading to corrosion and abrasion within the pump, particularly in semiconductor manufacturing processes, due to the limitations of traditional materials of construction.
Innovation Solution
A liquid ring pump design featuring a magnetic drive assembly with a rotor offset from the central axis, using corrosion-resistant materials for the rotor, stator, and service liquid circulation to minimize corrosion, along with a vertically mounted configuration to reduce blockages and enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional materials of construction (stainless steel, cast iron, brass) are used in liquid ring pumps, then the pump structure is simple and cost-effective, but the pump cannot handle strongly corrosive or reactive gases for long term use
Solution Approach 1:
The patent applies composite materials by combining a corrosion-resistant coating layer with a structural base material. The coating layer (e.g., ceramic, polymer, or metal alloy) provides chemical resistance to corrosive gases, while the underlying structure maintains mechanical strength and dimensional stability. This composite approach enables long-term reliability with corrosive effluent streams while avoiding the need to manufacture entire pumps from exotic materials like titanium or ceramics, thus balancing manufacturing feasibility with corrosion resistance.
2Reliability
If exotic materials (titanium, ceramics, polymers) are used to resist corrosion, then the pump can handle corrosive gases, but manufacturing close dimensional tolerances between rotor and stator becomes difficult and costly
Solution Approach 1:
The patent segments the pump components into distinct functional zones: a corrosion-resistant coating layer applied to surfaces exposed to corrosive effluent, and a separate structural substrate that provides dimensional stability. This segmentation allows the coating to be optimized for corrosion resistance while the substrate maintains precise dimensional tolerances for rotor-stator clearance, solving both requirements independently.
Solution Approach 2:
By using composite material systems where a corrosion-resistant layer is bonded to a dimensionally stable substrate, the patent achieves both corrosion resistance and manufacturing precision. The substrate can be manufactured from traditional materials with tight tolerances, while the coating provides the necessary chemical resistance without compromising dimensional accuracy.
3Object-affected harmful factors
If service liquid is used to treat corrosive effluent gas streams, then the gas stream is treated, but corrosion products are generated that cause additional corrosion and abrasion within the pump
Solution Approach 1:
The patent converts the harmful corrosive service liquid into a beneficial cooling and sealing medium by directing it through channels that cool the rotor and stator while maintaining the liquid seal. The system is designed to handle corrosion products through controlled circulation and filtration, transforming the corrosive environment from a damaging factor into a functional part of the pumping process that can be managed and utilized.
Solution Approach 2:
The patent implements protective measures beforehand by applying corrosion-resistant coatings to all surfaces that contact the service liquid or effluent stream. This prior protection prevents corrosion products from forming and causing damage, cushioning the system against the harmful effects of corrosive environments before they can occur during operation.
4Reliability
If magnetic drive assembly is used to drive the rotor, then leakage risk is reduced, but the drive chamber requires fluid communication with the pumping chamber
Solution Approach 1:
The patent merges the drive chamber with the pumping chamber by establishing fluid communication between them. This allows the magnetic drive assembly to operate within the corrosive environment without requiring separate sealing mechanisms, as the service liquid serves both as the pumping medium and the lubrication/cooling medium for the magnetic drive components. This integration reduces leakage risk while managing the increased complexity through functional consolidation.
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 solution effectively mitigates corrosion and abrasion issues, allowing for the safe and efficient treatment of corrosive effluent gas streams by using resistant materials and a magnetic drive system, reducing the risk of leakage and improving pumping performance.
Implementation Method 1
a magnetic follower received in a drive chamber that can be magnetically coupled with a magnetic drive outside the drive chamber such that when the magnetic drive is driven by a motor the magnetic follower imparts rotation to the rotor
Implementation Method 2
the rotor having a plurality of rotor blades which, on rotation of the rotor, cause liquid in the pumping chamber to form a ring having a centre coincident with the central axis of the pumping chamber and compression of effluent gas conveyed from an inlet to an outlet of the pumping chamber
Data Source
AI summary
Liquid ring pumps are used to pump a variety of fluid types. Corrosive fluids are easily handled by the work fluid but can cause corrosion of pumping mechanisms. The present invention provides a magnetically driven liquid ring pump with corrosion resistant pumping mechanisms which achieves a longer time between service intervals.