Dishwasher Detergent Compartment Spraying for Predictable Dissolution

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Solution Overview

Problem

Dishwashers face issues with the unpredictable and incomplete dissolution of detergent tablets, leading to reduced cleaning efficiency and potential detergent residue problems, especially with rotating spray arms getting stuck or liquid detergent leaking and causing greasy surfaces.

Innovation Solution

Incorporating two or more static nozzle openings in the dishwasher to directly spray water into the detergent compartment, ensuring efficient and predictable detergent dissolution, reducing residue buildup, and minimizing the risk of undissolved detergent displacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If rotating spray arms are used to spray water into the detergent compartment, then detergent dissolution can be achieved, but the dissolution time becomes random and unpredictable

Engineering Contradiction:
Improvedetergent dissolution reliabilityVSAvoiddetergent dissolution time
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The single rotating spray arm system is segmented into multiple static nozzle openings distributed around the washing chamber. Each nozzle independently sprays water into the detergent compartment, ensuring that at least one nozzle effectively delivers water regardless of rotation position, thereby making dissolution time predictable and reliable.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Instead of using a rotating spray arm that moves around the chamber, the invention inverts the approach by using multiple static nozzles that remain fixed in position. This inversion transforms the system from dynamic (rotating) to static, eliminating the randomness associated with rotation and ensuring consistent detergent dissolution.

Inventive Principle:
Principle #13The other way round (Inversion)

2Ease of operation

If liquid detergent is used in the detergent compartment, then detergent can be easily applied, but the liquid detergent may flow out and cause greasy surfaces

Engineering Contradiction:
Improvedetergent application easeVSAvoidgreasy surface residue
Core Design Contradiction:
Ease of operationVSObject-generated harmful factors

Solution Approach 1:

Water is sprayed into the detergent compartment before the wash cycle begins, preliminarily wetting the detergent and creating a more viscous mixture that is less prone to leaking. This preliminary action prevents liquid detergent from flowing out and causing greasy surfaces on the door.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The invention changes the physical parameters of the detergent by introducing water that alters its viscosity and flow characteristics. This parameter change transforms liquid detergent from a low-viscosity state prone to leakage to a more stable state that remains contained in the detergent compartment.

Inventive Principle:
Principle #35Parameter changes

3Quantity of substance

If detergent tablets are used, then correct detergent dosage is provided, but the tablets may fall out of the detergent compartment into the washing chamber

Engineering Contradiction:
Improvedetergent dosage accuracyVSAvoidundissolved detergent displacement
Core Design Contradiction:
Quantity of substanceVSObject-generated harmful factors

Solution Approach 1:

Water is sprayed into the detergent compartment at the beginning of the wash cycle, preliminarily dissolving the detergent tablet before the main wash proceeds. This preliminary dissolution action prevents undissolved tablets from falling out or being displaced into the washing chamber, while still providing the correct detergent dosage.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The invention replaces the mechanical action of rotating spray arms with a water spray system that uses fluid dynamics to dissolve detergent. This substitution eliminates the mechanical disturbance that could cause tablets to fall out, while still achieving effective detergent dissolution through controlled water spraying.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

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 solution provides a quicker, more reliable detergent dissolution, ensuring complete dissolution before peak water temperature is reached, improving cleaning results and maintaining the dishwasher's functionality and appearance over time.

Implementation Method 1

each of the two or more static nozzle openings is configured to spray water into the detergent compartment, via the opening, during operation of the dishwasher

Methodology Applied
Scientific EffectDissolution: Solvation

Data Source

PatentEP4018905B1dishwasher
Publication Date: 2023.08.23 ELECTROLUX APPLIANCES

AI summary

A dishwasher (1) is disclosed comprising a washing chamber (3) and a detergent compartment (5). The detergent compartment (5) comprises an opening (7) facing the washing chamber (3). The dishwasher (1) further comprises two or more static nozzle openings (9) arranged in the washing chamber (3). Each of the two or more static nozzle openings (9) is configured to spray water into the detergent compartment (5), via the opening (7), during operation of the dishwasher (1). The dishwasher (1) comprises a rack (17) for accommodating items to be washed in the washing chamber (3). The two or more static nozzle openings (9) are arranged on the rack (17). The dishwasher (1) comprises a door (23) arranged to provide a closure of the washing chamber (3), and wherein the detergent compartment (5) is arranged on an upper portion (23') of the door (23).