Centrifugal Pump Seal Housing Fluoropolymer Lining
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Solution Overview
Problem
Current high-speed centrifugal pumps face issues with sticky or gritty fluids causing buildup and fouling in the seal chamber, leading to pump failure, and existing polymer-based solutions are limited to low-speed applications.
Innovation Solution
The use of hard polymer linings, such as fluoropolymers, is applied to specific surfaces within the seal casing to create a non-stick and protective barrier, isolating the seal chamber and preventing fluid penetration, while maintaining operational integrity at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer-based linings are used in seal housing, then fluid buildup and fouling are prevented, but the pump is limited to low speed applications below 3600 rpm
Solution Approach 1:
The patent changes the material parameter from conventional polymer-based linings to tungsten carbide composite lining, which has superior mechanical properties and wear resistance. This material substitution enables the seal housing to withstand high-speed operational conditions (above 3600 rpm) while maintaining the protective function against fluid buildup and fouling that conventional polymers provide only at low speeds.
2Strength
If metallic components are used for stationary surfaces in seal housing, then structural strength is maintained, but sticky or gritty fluids cause buildup and fouling leading to pump failure
Solution Approach 1:
The patent employs a composite material solution by applying tungsten carbide composite lining to the seal housing. This composite structure combines the structural strength of metal substrate with the non-stick and fouling-resistant properties of tungsten carbide coating, thereby maintaining structural integrity while preventing fluid buildup and reliability issues associated with pure metallic surfaces.
3Ease of operation
If the seal chamber is exposed to pumped fluid, then sealing function is performed, but fluid penetration causes fouling in the seal chamber
Solution Approach 1:
The tungsten carbide composite lining acts as an intermediary barrier between the pumped fluid and the seal chamber components. This protective layer allows the seal chamber to perform its sealing function while preventing direct contact between sticky or gritty fluids and the seal chamber internals, thereby avoiding fouling and maintaining reliability.
Data Source
AI summary
A centrifugal pump, and components thereof, operable at high speeds, is described under the present disclosure. A hard polymer sleeve can be applied to certain surfaces of a seal casing within the pump. If the sleeve is applied along surfaces near the center shaft, then the hard polymer will withstand the forces and pressures of the system. The hard polymer might not be used along the outer diameter, farther from the shaft, because velocities are higher the further out one goes. The current disclosure allows for the use of fluoropolymer in the lining sleeve. The benefits of fluoropolymer have been unavailable in high speed centrifugal pumps because the forces are too great on the periphery of the seal casing. However, the lower speeds along the interior, near the shaft, allow fluoropolymer to be used.