Centrifugal Pump Housing Flat Cover Impact Absorption
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Solution Overview
Problem
Centrifugal pumps used in abrasive and high-impact applications face challenges with heavy and costly steel or cast iron casings that are prone to rupture under pressure surges and lump material impacts, leading to material ejection and safety risks, while existing designs complicate impeller replacement and are inefficient due to deformation under overpressure.
Innovation Solution
A centrifugal pump design featuring a single-piece plastic cover part with reinforcement rings and a cup-shaped outer casing made from tough, yieldable materials to absorb impacts and maintain structural integrity, reducing weight and cost, and allowing for simpler impeller replacement by eliminating a separate inlet lid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a separate inlet cover is used to close the opening in the cover part, then the impeller can be replaced without removing the cover part, but the inlet cover complicates the structure and creates additional components that increase device complexity
Solution Approach 1:
The inlet cover function is merged into the cover part itself by providing a closing surface that forms an integrated unit. The cover part includes a closing surface at its outlet end that can be closed by a closing element, eliminating the need for a separate inlet cover component while maintaining the ability to replace the impeller.
2Ease of manufacture
If the cover part is made as a single integrated piece with the closing surface, then the structure is simplified and manufacturing is easier, but the closing surface may deform under internal overpressure reducing sealing effectiveness
Solution Approach 1:
The cover part is constructed as a composite structure with a closing surface made of a material selected for its resistance to deformation under pressure. The closing surface may be made of a different material than the main body of the cover part, allowing optimization of each component for its specific function while maintaining overall structural integrity and sealing effectiveness.
3Strength
If steel or cast iron is used for the outer casing to withstand abrasive materials, then the casing has high hardness and abrasion resistance, but it cannot yield well under impact forces from pressure surges or lumps of material
Solution Approach 1:
The material properties of the outer casing are optimized by selecting materials with appropriate yield strength and ductility characteristics. The casing is designed to yield controllably under impact loads from pressure surges or lumps of material, absorbing energy while maintaining structural integrity. This allows the casing to adapt to dynamic loading conditions while still providing protection against abrasive wear.
Data Source
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AI summary
The above mentioned invention is related to a centrifugal pump, comprising an outer casing, an inner casing contained in the outer casing, an impeller rotatably supported within the inner casing, an outer casing inlet concentrically arranged with respect to the impeller as well as a tangential outlet, said outer casing comprising a cup shaped part as well as a cover part mounted onto the cup shaped part. The cover part comprises a single element which extends as a unity continuously between the cup shaped part and the outer casing inlet.