Coiled Envelope Bladder for Submersible Pump Seal
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Solution Overview
Problem
Submersible pumping systems face challenges with seal bags that allow water permeation at high temperatures, requiring expensive metal barriers that are prone to mechanical failure due to repeated flexing, necessitating an improved seal bag that is both water-impermeable and durable.
Innovation Solution
A volumetric compensator assembly featuring a flat envelope bladder secured to a bladder support tube, constructed with impermeable metal materials and a coiled configuration to accommodate fluid expansion and contraction, allowing the use of high-temperature metallic materials while maintaining durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal barrier materials are used in seal bags to prevent water permeation at high temperatures, then water impermeability is improved, but mechanical reliability deteriorates due to repeated flexing causing mechanical failure
Solution Approach 1:
The seal bag employs a composite structure combining a polymer barrier material with an embedded metal mesh reinforcement. The polymer layer provides water impermeability at high temperatures, while the metal mesh embedded within the polymer provides mechanical strength and flexibility to withstand repeated flexing without failure. This composite approach resolves the contradiction by integrating the advantages of both materials.
2Strength
If conventional polymer seal bags are used, then mechanical flexibility and durability are maintained, but water impermeability deteriorates at high temperatures due to water permeation
Solution Approach 1:
The seal bag employs a composite structure combining a polymer barrier material with an embedded metal mesh reinforcement. The polymer layer provides water impermeability at high temperatures, while the metal mesh embedded within the polymer provides mechanical strength and flexibility to withstand repeated flexing without failure. This composite approach resolves the contradiction by integrating the advantages of both materials.
3Reliability
If metal barrier materials are used to replace polymer materials in seal bags, then water impermeability at high temperatures is improved, but manufacturing cost increases
Solution Approach 1:
The seal bag employs a composite structure combining a polymer barrier material with an embedded metal mesh reinforcement. The polymer layer provides water impermeability at high temperatures, while the metal mesh embedded within the polymer provides mechanical strength and flexibility to withstand repeated flexing without failure. This composite approach resolves the contradiction by integrating the advantages of both materials.
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 provides a flexible and durable fluid isolation mechanism that prevents water permeation at high temperatures, enhancing the longevity and performance of submersible pumping systems by using metallic materials effectively.
Implementation Method 1
a flexible envelope bladder secured to a support tube... accommodate the expansion and contraction of the dielectric motor lubricant
Implementation Method 2
At high temperatures, water can permeate through the polymeric barrier materials that are used in modern seal bags. In such high temperature applications, metal barrier materials must be used.
Data Source
Figure 1
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AI summary
A volumetric compensator assembly for use in the seal section of a pumping system includes an envelope bladder that in turn includes a flexible top sheet and a bottom sheet connected to the top sheet along a pair of side seams and an end seam. The top sheet and bottom sheet together define a bladder interior that has a variable capacity. The volumetric compensator assembly also has a bladder support tube and the envelope bladder is coiled around the bag support tube.