Motor Pump Cooling Housing Flow Guide Rib Gap Design

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Solution Overview

Problem

Motor pump units for high-pressure cleaning apparatuses face issues with liquid leakage due to vibrations causing damage to the motor housing surface, compromising the long-term water impermeability of the annular space.

Innovation Solution

Positioning flow guide ribs at a distance from the motor housing creates a gap, allowing liquid to flow in a defined direction while preventing direct contact and damage, combined with radial sealing rings to ensure the motor housing remains impermeable and effectively cooled.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If flow guide ribs are positioned in direct contact with the motor housing to guide liquid flow, then liquid flow guidance is improved, but the motor housing surface is damaged by vibrations causing liquid leakage

Engineering Contradiction:

Improveliquid flow guidance efficiencyVSAvoidwater impermeability of motor housing

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent introduces a gap as an intermediary space between the flow guide ribs and the motor housing. This gap prevents direct contact and vibration-induced damage to the motor housing surface while still allowing the flow guide ribs to effectively direct liquid flow through the annular space, thus resolving the contradiction between flow guidance efficiency and water impermeability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If flow guide ribs are spaced-apart from the motor housing to prevent damage, then water impermeability is maintained, but liquid flow direction control is reduced

Engineering Contradiction:

Improvewater impermeability of motor housingVSAvoidliquid flow direction control

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent utilizes the radial dimension by positioning flow guide ribs at a controlled distance from the motor housing surface. The ribs extend radially inward to guide flow while maintaining a gap that prevents contact with the motor housing. This dimensional arrangement allows simultaneous achievement of flow direction control and water impermeability.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If the annular space is sealed to prevent liquid leakage, then water impermeability is improved, but vibration-induced relative movement between flow guide ribs and motor housing increases

Engineering Contradiction:

Improvewater impermeability of annular spaceVSAvoidrelative position stability of flow guide ribs

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent segments the annular space into distinct functional zones: a sealed region maintaining water impermeability and a gap region accommodating vibration-induced movement. The flow guide ribs are positioned in the gap region, allowing them to move relative to the motor housing during vibration while the sealed annular space maintains its water-tight integrity, thus resolving the contradiction between sealing and vibration stability.

Inventive Principle:

Principle #1Segmentation

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 ensures reliable long-term water impermeability and effective cooling of the electric motor, preventing liquid leakage and maintaining the motor housing's integrity despite vibrations, while enhancing the thermal management of the motor pump unit.

Implementation Method 1

the cooling housing, on its inside, comprises at least one flow guide rib for guiding the liquid within the annular space

Methodology Applied

Scientific EffectFluid flow guidance:

Implementation Method 2

The liquid can flow through the annular space and reach the suction inlet of the pump by way of the annular space outlet, so that it can then be pressurized

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Data Source

PatentUS8734129B2Motor pump unit

Publication Date: 2014.05.27 ALFRED KARCHER SE & CO KG

AI summary

A motor pump unit for a high-pressure cleaning apparatus has an electric motor and a pump. The electric motor has a motor housing that is surrounded by a cooling housing with an annular space having an annular space inlet and an annular space outlet formed therebetween. The pump has a suction inlet connected to the annular space outlet and a pressure outlet. The liquid to be transported by the pump can be supplied to the annular space inlet. The cooling housing, on its inside, has at least one flow guide rib for guiding the liquid within the annular space. In order to ensure that no liquid can leak out of the annular space even in the long term, the at least one flow guide rib is spaced-apart from the motor housing.