Dishwasher Separable Filter Assembly for Linear Injection Coverage

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Solution Overview

Problem

Dishwashers with rotating injection nozzles often create dead zones where water is not injected, leading to incomplete washing, and existing linear type injection structures lack a practical and efficient filter system for foreign substances.

Innovation Solution

A dishwasher with a separable filter assembly that includes a first coarse filter with protruding interference portions, a second coarse filter accommodated in a sump, and a micro filter, where the first coarse filter is mounted over the sump to pressurize and fix the second coarse filter and micro filter, ensuring effective filtration and easy maintenance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a rotating injection nozzle is used, then the washing water is injected dynamically, but dead zones occur where washing water is not injected

Engineering Contradiction:

Improvewashing coverageVSAvoidwashing completeness

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The injection system is segmented into multiple fixed nozzles positioned at different locations and angles, each covering specific zones. This segmentation allows comprehensive coverage of the washing area without creating dead zones, replacing the single rotating nozzle approach.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using a single moving nozzle that rotates to cover areas, the invention inverts the approach by using multiple fixed nozzles that simultaneously cover different areas. This eliminates the need for rotation while ensuring complete coverage.

Inventive Principle:

Principle #13The other way round (Inversion)

2Ease of operation

If a linear type injection structure with fixed nozzle and moving vane is used, then overall area coverage is achieved, but the filter assembly is difficult to separate and maintain

Engineering Contradiction:

Improvewashing coverageVSAvoidfilter maintenance

Core Design Contradiction:

Ease of operationVSEase of repair

Solution Approach 1:

The filter assembly is segmented into multiple separable components including a first coarse filter, second coarse filter, and micro filter. Each component can be independently removed and cleaned, greatly facilitating maintenance while maintaining the linear injection structure for comprehensive washing coverage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The filter assembly is extracted as a separate, removable component from the main washing structure. The filters can be taken out independently for cleaning and maintenance without disassembling the entire injection system, improving ease of repair while preserving the linear injection design.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If multiple filter components are stacked to improve filtration, then filtration effectiveness increases, but device complexity increases

Engineering Contradiction:

Improvefiltration effectivenessVSAvoidfilter assembly structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The filter components are arranged in a nested configuration where the second coarse filter is positioned inside the first coarse filter, and the micro filter is positioned inside the second coarse filter. This nested arrangement achieves multi-stage filtration with enhanced effectiveness while minimizing structural complexity and maximizing space utilization.

Inventive Principle:

Principle #7Nested doll (Nesting)

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 separable filter assembly ensures thorough filtration of foreign substances, preventing dead zones and allowing for easy removal of accumulated debris, enhancing washing efficiency and user convenience.

Implementation Method 1

When the first coarse filter is mounted on the sump, the second coarse filter and the micro filter is pressurized by the first coarse filter to be in close contact with an inside of the sump

Methodology Applied

Scientific EffectMechanical contact and pressurization: Mechanical Force

Implementation Method 2

a coarse filter located at a bottom plate of the washing tub and configured to filter foreign substances included in the washing water

Methodology Applied

Scientific EffectPhysical filtration: Filter (physical)

Data Source

PatentUS10349806B2Dishwasher

Publication Date: 2019.07.16 SAMSUNG ELECTRONICS CO LTD

AI summary

Disclosed herein is a dishwasher that includes a linear type injection structure with an easily separable filter assembly. The dishwasher includes a washing tub configured to wash dishes, a sump configured to store washing water injected toward the washing tub, and a coarse filter located at a bottom plate of the washing tub and configured to filter foreign substances included in the washing water. Here, the coarse filter includes a first coarse filter including filter holes through which the washing water that drops to the bottom plate passes, and is configured to protrude from the bottom plate of the washing tub, and a second coarse filter located below the first coarse filter.