Dishwasher Detergent Dosing Sequence for Quick Wash Cleaning
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Solution Overview
Problem
Existing household dishwashers face challenges in achieving optimal cleaning and drying results due to negative interactions between multiple cleaning substances in powdered detergents and limitations with tablet-form combination products, especially in quick wash cycles where complete dissolution is not possible, leading to water stains on glasses.
Innovation Solution
A method for operating a household dishwasher that uses a detergent dosing system to meter individual cleaning substances at specific program steps, avoiding interactions by adding substances like alkali carriers, enzymes, surfactants, and bleaching agents at different times to optimize cleaning and drying, with control over pH and water hardness, and separate addition of bleaching agents to enhance effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If powdered detergent with multiple cleaning substances is used, then cleaning substances are added at once, but negative interactions between substances reduce cleaning performance
Solution Approach 1:
The patent segments the cleaning substances into multiple separate dosing systems, each releasing a specific cleaning substance at a predetermined time during the washing program. This prevents negative interactions between substances by controlling their release timing, thereby maintaining cleaning performance while using multiple cleaning substances.
2Reliability
If combination products in tablet form are used, then active ingredients are released at different times, but possible combinations and temporal sequences are limited
Solution Approach 1:
The patent employs multiple independent dosing systems that can be configured to release different cleaning substances at different times. This multi-functional approach allows for versatile combinations and temporal sequences of cleaning substances, overcoming the limitations of fixed combination products while maintaining optimized cleaning performance.
3Productivity
If combination products are used in quick wash programs, then program running time is reduced, but complete dissolution is not possible leading to water stains
Solution Approach 1:
The patent segments the cleaning substances and releases them at different times during the quick wash program through separate dosing systems. This staged release ensures complete dissolution of each substance within the shortened program time, preventing water stains on glasses while maintaining rapid wash cycle efficiency.
4Device complexity
If multiple cleaning substances are added simultaneously, then dosing system is simpler, but substance interactions negatively affect cleaning result
Solution Approach 1:
The patent divides the dosing system into multiple separate dosing units, each responsible for releasing a specific cleaning substance at a predetermined time. This segmentation prevents negative interactions between substances while maintaining a relatively simple overall system structure that can be integrated into existing washing machines.
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 approach improves cleaning performance by minimizing substance interactions, effectively removing tough soils and preventing water stains, while optimizing water hardness and bleaching efficiency, even at lower temperatures, resulting in enhanced cleaning and drying outcomes with minimal chemical use.
Implementation Method 1
enzymes that can decompose starch, protein or fat compounds
Implementation Method 2
Surfactants and alkali carriers
Implementation Method 3
dispersing and complexing agents, which reduce the water hardness through complex formation
Data Source
AI summary
The invention relates to a method for operating a water-conducting domestic appliance, in particular a domestic dishwasher, said water-conducting domestic appliance having a programme controller for executing a plurality of successive programme steps and the programme controller being at least operatively connected to one detergent dosing system. The invention is characterised in that at least during one programme step, a cleaning substance that fulfils a function is added in a dosed manner.