Pump Casing Cutter Geometry for Sewage Blockage Prevention

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Solution Overview

Problem

Sewage containing foreign matter such as fibrous or solid substances can cause blockages in pumps by adhering to and accumulating on the impeller vanes.

Innovation Solution

A pump casing with a cutter having a specific upper surface design that includes regions with varying angles to cut and grind foreign matter, preventing blockages by effectively cutting and grinding foreign substances before they can accumulate on the impeller.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional pump casing without a cutter is used, then the pump structure is simple and manufacturing is easy, but foreign matter accumulates on the impeller vanes causing blockage

Engineering Contradiction:

Improveblockage preventionVSAvoidcutter structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The cutter is positioned to perform preliminary cutting of foreign matter before it reaches the impeller vanes. The upper surface of the cutter is designed with specific angles to intercept and cut foreign matter in advance, preventing accumulation on the impeller and subsequent blockage.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The cutter acts as an intermediary component between the suction port and the impeller. It intercepts foreign matter from the liquid flow and performs cutting action before the foreign matter can contact the impeller vanes, thus protecting the impeller from blockage.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the cutter upper surface has a single angle design, then manufacturing is simple, but cutting effectiveness varies across different regions

Engineering Contradiction:

Improvecutting effectivenessVSAvoidmulti-region angle structure

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The upper surface of the cutter is divided into multiple regions (first region, second region, third region) with different angles. Each region is designed with a specific angle optimized for its location and function, allowing effective cutting of foreign matter across different areas while maintaining manufacturability through modular design.

Inventive Principle:

Principle #3Local quality

3Reliability

If the gap between the cutter and leading edge portion is large, then manufacturing is easy and assembly is simple, but cutting precision and effectiveness are reduced

Engineering Contradiction:

Improvecutting precisionVSAvoidgap control

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The gap between the cutter and the leading edge portion is controlled within a specific range (0.1mm to 2.0mm). This parameter optimization ensures sufficient cutting precision and effectiveness while maintaining reasonable manufacturing tolerances and assembly simplicity.

Inventive Principle:

Principle #35Parameter changes

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 cutter design in the pump casing effectively cuts and grinds foreign matter, preventing blockages and ensuring smooth operation of the pump by discharging foreign substances through the discharge port.

Implementation Method 1

the cutter cuts (and/or grinds) the foreign matter

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentUS12510081B2Pump casing and pump

Publication Date: 2025.12.30 EBARA CORP

AI summary

A pump casing and a pump. The pump casing includes a cutter having an upper surface facing a leading edge portion of an impeller when the impeller is housed in the pump casing. The upper surface has a region with at least two angles.