Chopped Carbon Fibre Containment Shell for Magnetic Pump
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Solution Overview
Problem
The use of metallic containment shells in magnetic drive centrifugal pumps leads to eddy current losses, limiting their application range, while alternative composite materials like carbon fibre composites reduce eddy current losses but incur high set-up and manufacturing costs due to labor-intensive processes.
Innovation Solution
A containment shell made from a matrix material with randomly aligned chopped carbon fibre strands, manufactured using injection moulding, which reduces eddy current losses and lowers production costs while maintaining acceptable internal pressure capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If metallic containment shells are used, then manufacturing cost is low and ease of manufacture is high, but eddy current losses increase with shell diameter, rotational speed and wall thickness
Solution Approach 1:
The patent applies composite materials by combining carbon fibre reinforcement with a polymer matrix (such as PEEK or PP) to create a containment shell that eliminates eddy current losses while maintaining structural integrity. This composite construction resolves the contradiction by providing non-conductive material properties that prevent energy loss, while the injection moulding process keeps manufacturing costs reasonable.
Solution Approach 2:
The patent changes the material parameter from conductive metal to non-conductive composite material. This fundamental parameter change eliminates the eddy current effect entirely, as the composite material does not support the formation of eddy currents, thereby resolving the energy loss issue without requiring complex manufacturing processes.
2Loss of energy
If carbon fibre composite materials are used, then eddy current losses are reduced or eliminated, but set-up costs and unit manufacturing costs increase due to labor-intensive processes
Solution Approach 1:
The patent replaces the manual mechanical lay-up process with an automated injection moulding process. This substitution eliminates the labor-intensive positioning of carbon fibre mats and weaving, while maintaining the beneficial non-conductive properties of carbon fibre composites. The automated process significantly reduces manufacturing costs and increases production efficiency.
Solution Approach 2:
The patent changes the manufacturing process parameter from manual lay-up to automated injection moulding. This process parameter change transforms a labor-intensive, high-cost operation into an automated, efficient process that can produce containment shells with embedded carbon fibre reinforcement at scale, thereby resolving the manufacturing cost contradiction.
3Loss of energy
If standard carbon fibre mats are used in laying up process, then eddy current losses are reduced, but manufacturing time increases and labour intensity increases
Solution Approach 1:
The patent replaces the sequential manual lay-up operations with a single-step automated injection moulding process. This substitution eliminates the time-consuming positioning and alignment of multiple carbon fibre mat layers, while still achieving the goal of reducing eddy current losses through proper fibre orientation control during the automated injection process.
Solution Approach 2:
The patent incorporates the carbon fibre reinforcement into the mould tooling beforehand, creating pre-positioned fibre channels or mats that guide the injected material. This preliminary action eliminates the need for manual positioning during production, significantly increasing manufacturing rate while maintaining the eddy current reduction benefits of structured carbon fibre placement.
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 eliminates eddy current losses and reduces manufacturing costs, enabling more efficient and cost-effective production of magnetic drive pumps that can withstand high pressures and corrosive environments.
Implementation Method 1
one of the downsides with a metallic construction is that eddy currents are created and this leads to eddy current losses that increase with shell diameter, increasing rotational speed and increasing wall thickness
Implementation Method 2
provides a contactless transfer of motion by way of the magnetic coupling across a static physical barrier
Data Source
AI summary
A containment shell for a magnetic pump, the shell comprising: a body section having a continuous side wall defining a chamber, and an end wall closing the chamber at one end, the chamber being open at the other end, wherein the body section and the end wall are integrally formed from a matrix material in which chopped carbon fibre material is distributed.