A dishwasher

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Solution Overview

Problem

Conventional dishwashers with larger spray arms for increased washing area require higher water flow rates, leading to increased water consumption and inefficient washing performance at low flow rates.

Innovation Solution

A dishwasher design featuring a circular spray arm with movable covering members and nozzles, allowing for regional and homogeneous washing by adjusting the flow rate through the use of a trapezoid-shaped movement member and elastic flaps, which enables high flow rates without increasing water usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If spray arms with larger washing area are used, then washing area is enlarged, but water consumption increases

Engineering Contradiction:

Improvewashing areaVSAvoidwater consumption

Core Design Contradiction:

Area of stationary objectVSQuantity of substance

Solution Approach 1:

The spray arm is divided into multiple spray zones with individual nozzles arranged in specific patterns. Each nozzle sprays water in a targeted direction toward specific areas of the washing tub, creating segmented spray zones that cover the entire washing area efficiently without requiring excessive water flow

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the spray arm have nozzles with different spray characteristics optimized for local washing needs. The nozzle arrangement and spray angles are tailored to specific areas, ensuring effective cleaning with minimal water consumption in each local zone while maintaining overall coverage

Inventive Principle:

Principle #3Local quality

2Area of stationary object

If spray arms with larger washing area are used, then washing area is enlarged, but washing performance at low flow rates deteriorates

Engineering Contradiction:

Improvewashing areaVSAvoidwashing performance

Core Design Contradiction:

Area of stationary objectVSProductivity

Solution Approach 1:

The spray arm creates multiple focused spray zones rather than a single diffuse spray pattern. This segmentation allows each zone to maintain adequate spray pressure and intensity even when overall water flow is reduced, preserving washing performance across the entire large washing area

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The spray arm has a circular configuration with nozzles arranged to create radially outward spray patterns. This curved geometry naturally distributes water flow evenly across the washing area while maintaining spray velocity and pressure, enabling effective washing performance at lower flow rates compared to linear or flat spray arm designs

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 design achieves improved washing efficiency by optimizing water flow and distribution, enabling effective cleaning with reduced water consumption and allowing for user-adjustable regional or homogeneous washing modes.

Implementation Method 1

a movement member moving by the force of water coming out of a nozzle. The movement member is positioned adjacent to the covering member. Water pushes the movement member backwards.

Methodology Applied

Scientific EffectWater pressure: Pressure Increase

Data Source

PatentEP3515274B1A dishwasher

Publication Date: 2022.02.09 ARCELIK AS

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AI summary

The present invention relates to a dishwasher (1) comprising a body (2), a washing tub (3) provided on the body (2), in which washing is performed, a circular spray arm (4) enabling spraying of water in the washing tub (3), and a plurality of nozzles (5) arranged on the spray arm (4), enabling guiding of water.