Sheet Steel Multistage Pump Base With Carrier Pipe Reinforcement

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Solution Overview

Problem

Multistage rotary pumps made with cast iron base elements are expensive and heavy, while those made with sheet metal suffer from stability issues when replacing cast iron.

Innovation Solution

A multistage pump design using a sheet steel base element with an elongate carrier pipe mechanically connecting the inlet and outlet ports, providing stability and serving as channels, which is produced at lower costs and maintains robustness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If cast iron is used for the base element, then stability and mechanical strength are sufficient, but the pump becomes heavy and expensive

Engineering Contradiction:

Improvemechanical strengthVSAvoidweight

Core Design Contradiction:

StrengthVSWeight of stationary object

Solution Approach 1:

The patent replaces expensive cast iron with sheet metal (cold-formed steel), which is lighter and more cost-effective. The sheet metal base element achieves sufficient durability through the reinforcing carrier integration rather than relying on the inherent strength of cast iron

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The base element combines sheet metal with an integrated carrier structure, creating a composite construction that achieves the mechanical strength of cast iron while maintaining the weight and cost advantages of sheet metal

Inventive Principle:

Principle #40Composite materials

2Strength

If cast iron is used for the base element, then mechanical strength is sufficient, but the pump becomes expensive

Engineering Contradiction:

Improvemechanical strengthVSAvoidmanufacturing cost

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The carrier structure is merged with the base element through integration, where the carrier serves dual purposes as both structural reinforcement and fluid conduit, eliminating the need for separate cast iron base and reducing manufacturing complexity

Inventive Principle:

Principle #5Merging (Combining)

3Weight of stationary object

If sheet metal is used for the base element, then the pump becomes light-weight and less expensive, but stability problems occur

Engineering Contradiction:

ImproveweightVSAvoidstability

Core Design Contradiction:

Weight of stationary objectVSStability of the object's composition

Solution Approach 1:

The carrier is strategically positioned at critical locations within the base element where stability is most needed, providing localized reinforcement rather than uniform thickening. This allows the base element to remain lightweight overall while achieving sufficient stability at key structural points

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Inventive Principle:

Principle #40Composite materials

4Ease of manufacture

If sheet metal is used for the base element, then the pump becomes less expensive, but stability problems occur

Engineering Contradiction:

Improvemanufacturing costVSAvoidstability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10900495B2Multistage pump

Publication Date: 2021.01.26 GRUNDFOS HLDG

AI summary

The invention relates to a multistage pump (1), including a pump body (4), at a lower end of which a base element (2) is arranged, and at an upper end of which a head element (3) is arranged. At least the base element (2) is made from sheet steel and has an inlet port (5) and an outlet port (16). The inlet port (5) and the outlet port (16) are mechanically connected to each other by a pipe (6) running through the base element (2).