Pressure Washer Housing Shape Prevents Motor Water Accumulation

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Solution Overview

Problem

Pressure washers risk electric motor failure due to water accumulation inside the housing, which can lead to the motor being wetted and malfunctioning.

Innovation Solution

The pressure washer is designed with a housing outer surface shape that prevents it from standing on its own when used as a placement surface near the electric motor, thereby preventing water from accumulating and reaching the motor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the pressure washer is designed to stand on its own with the outer surface of the housing most proximate to the electric motor as the placement surface, then the ease of operation is improved, but the reliability deteriorates due to water accumulation wetting the electric motor

Engineering Contradiction:

Improveease of placementVSAvoidmotor reliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The housing outer surface is designed with a specific shape that creates preliminary anti-action against water accumulation. The curved or inclined surface prevents water from pooling near the electric motor by directing it away, thus preventing the harmful effect before it can occur.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The placement surface is designed with an asymmetric shape that is not suitable for stable standing. This asymmetric design prevents the pressure washer from being placed on the housing surface near the electric motor, thereby preventing water accumulation and motor wetting while maintaining operational ease through other means.

Inventive Principle:

Principle #4Asymmetry

2Ease of operation

If the outer surface of the housing is made flat and stable for placement, then the ease of operation is improved, but water can accumulate and wet the electric motor causing failure

Engineering Contradiction:

Improveplacement stabilityVSAvoidwater accumulation effect

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The outer surface of the housing is designed with curvature rather than being flat. This curved surface prevents water accumulation by allowing water to flow off the surface easily, eliminating the harmful effect of water pooling near the electric motor while maintaining placement stability through other design features.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Adaptability or versatility

If the housing shape allows stable standing on the motor-proximate surface, then usability is improved, but the electric motor is at risk of wetting and failure

Engineering Contradiction:

Improveusage flexibilityVSAvoidmotor protection

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The harmful function of the housing surface (which could allow stable placement leading to water accumulation) is extracted or removed by designing the surface shape to be unsuitable for stable placement. This eliminates the risk pathway while preserving the essential functions of the housing.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS11845112B2Pressure washer

Publication Date: 2023.12.19 MAKITA CORP

AI summary

A pressure washer disclosed herein may include a pump mechanism configured to pressurize water supplied through a water inlet and pump out the water through a water outlet, an electric motor configured to drive the pump mechanism, and a housing that houses the pump mechanism and the electric motor. An outer surface of the housing most proximate to the electric motor may have a shape that does not allow the pressure washer to stand on its own when the outer surface is used as a placement surface.