Magnetic Drive Water Pump Isolation Shell Against Corrosion

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing water pumps fail due to water seepage into the pump body, causing corrosion and reducing their lifespan, as they often need to be submerged, leading to thermal expansion and contraction issues that create gaps in the sealing structure.

Innovation Solution

A water pump design featuring a pump body, pump head, isolation shell, and impeller assembly where the drive assembly is magnetically connected to the impeller, allowing the impeller to rotate within the water inlet pipe without submerging the entire pump, preventing water from entering the pump body through the isolation shell's separation effect.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the water pump is submerged in water for pumping, then water pumping function is achieved, but water penetrates into the pump body through gaps causing corrosion and failure

Engineering Contradiction:

Improvewater pumping functionVSAvoidpump body waterproofing

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The water pump is divided into two separate spaces: a dry space containing the pump body and drive assembly, and a wet space containing the pump head and impeller assembly. The isolation shell creates this segmentation, allowing the pump to function while preventing water from reaching the motor components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The isolation shell acts as an intermediary barrier between the water environment and the pump body. It physically separates the wet pump head from the dry pump body, preventing water penetration while still allowing the magnetic drive to transmit power across the boundary.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the pump body is exposed outside water, then water infiltration is prevented, but thermal expansion and contraction create gaps in sealing structure

Engineering Contradiction:

Improvewater infiltration preventionVSAvoidsealing structure integrity

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The mechanical connection between drive assembly and impeller assembly is replaced with a magnetic field coupling system. The first magnet on the drive assembly magnetically connects to the second magnet on the impeller assembly, eliminating the need for direct mechanical contact and associated sealing requirements.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The isolation shell provides a flexible yet effective barrier that can accommodate thermal expansion and contraction of components without compromising the seal. This flexible containment allows for dimensional changes while maintaining the waterproof boundary.

Inventive Principle:

Principle #30Flexible shells and thin films

3Reliability

If magnetic connection is used between drive assembly and impeller assembly, then water infiltration is prevented, but device complexity increases

Engineering Contradiction:

Improvewater infiltration preventionVSAvoidmagnetic drive structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The magnetic coupling system serves multiple functions simultaneously: it transmits rotational power from the drive assembly to the impeller assembly, prevents water infiltration between the two assemblies, and accommodates thermal expansion without compromising sealing. This multi-functionality reduces the need for separate mechanical seals and couplings.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

This design prevents water from entering the pump body, thereby protecting internal components from corrosion and extending the pump's lifespan while allowing effective water pumping without submersion.

Implementation Method 1

the drive assembly is magnetically connected to the impeller assembly to drive the impeller assembly to rotate in the water inlet pipe

Methodology Applied

Scientific EffectMagnetic force: Magnetism

Data Source

PatentEP4187098A1Water pump, cold water storage tank and water dispenser

Publication Date: 2023.05.31 FOSHAN SHUNDE MIDEA WATER DISPENSER MFG

Figure 1~2
Figure 3~4
Figure 5~6

AI summary

Disclosed are a water pump, a cold water storage tank and a water dispenser. The water pump includes a pump body, a pump head, an isolation shell and an impeller assembly. The pump body includes a drive assembly. The pump head includes a water inlet pipe and a water outlet pipe communicating with the water inlet pipe. The isolation shell is provided between the pump body and the pump head. The impeller assembly is provided in the water inlet pipe. The drive assembly is magnetically connected to the impeller assembly to drive the impeller assembly to rotate in the water inlet pipe.