Dishwasher and method for operating a dishwasher
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Solution Overview
Problem
Existing dishwashers require users to manually select between heavy-duty and delicate loads for separate baskets, making operation inconvenient and increasing the risk of damage to delicate items due to temperature variations.
Innovation Solution
A dishwasher design with an upper and lower basket system, where the upper basket receives delicate items and the lower basket receives stable items, utilizing an upper and lower spray arm with temperature control, where the washing liquid supply to the upper arm is stopped when the temperature exceeds a certain level, and the pump speed is reduced during heating, ensuring a softer treatment for delicate items.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the washing liquid temperature is increased to improve cleaning performance for heavy-duty dishes, then the cleaning effectiveness is improved, but the risk of damage to delicate items increases
Solution Approach 1:
The washing chamber is divided into two separate baskets (upper and lower) that can be independently controlled. The lower basket receives hot washing liquid for heavy-duty dishes requiring high cleaning effectiveness, while the upper basket receives cold or warm washing liquid for delicate items that are sensitive to high temperatures. This segmentation allows different temperature zones to coexist within the same washing cycle.
Solution Approach 2:
Different regions of the washing chamber are provided with different washing liquid temperatures according to the specific needs of the dishes placed in each basket. The lower basket area is characterized by high temperature for effective cleaning of sturdy dishes, while the upper basket area is characterized by lower temperature to protect delicate items from thermal damage.
2Object-affected harmful factors
If the pump speed is reduced during heating to protect delicate items, then the temperature control is improved, but the cleaning performance for heavy-duty dishes may be compromised
Solution Approach 1:
The washing liquid circulation system is segmented into separate supply lines for the upper and lower baskets. The pump can selectively direct washing liquid to different baskets at different speeds and temperatures. During heating phases, the pump reduces speed for the upper basket to protect delicate items while maintaining adequate flow to the lower basket for effective cleaning of heavy-duty dishes.
Solution Approach 2:
The pump speed is dynamically adjusted during the washing cycle based on the phase and the basket being served. The pump operates at higher speeds during main washing phases for heavy-duty dishes and reduces speed during heating phases or when serving the upper basket to protect delicate items. This dynamic control allows the system to optimize cleaning performance while protecting sensitive items throughout the cycle.
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 design allows for simultaneous washing of heavy-duty and delicate items in the same cycle while preventing damage to delicate items by controlling temperature and detergent exposure, ensuring effective cleaning and user convenience.
Implementation Method 1
liquid heating means for heating the washing liquid, such that the washing liquid can be heated up at least to a first temperature T1 and subsequently to a second temperature T2
Implementation Method 2
a pump, a first supply branch for said first sprayer and a second supply branch for said second sprayer, where in order to wash the crockery said pump provides for forcing liquid from the bottom of said tub into said supply branches
Data Source
Figure 1
AI summary
Dishwasher, comprising a washing chamber in which at least one upper basket and at least one lower basket for receiving the washing load are or can be arranged, wherein the upper basket can receive more delicate washing load and the lower basket can receive more stable washing load, further comprising a washing liquid circulation system distributing washing liquid within the washing chamber by means of an upper spray arm and a lower spray arm and having at least one pump for supplying washing liquid to both spray arms and further comprising liquid heating means for heating the washing liquid, such that the washing liquid can be heated up at least to a first temperature ?1 and to a second temperature T2, wherein the first temperature ?1 is lower than the second temperature T2, and wherein the washing liquid circulation system stops the supply of the washing liquid to the upper spray arm when the washing liquid temperature exceeds the first temperature T1 and wherein the pump speed of the at least one pump can be reduced during heating up the washing liquid from the first temperature ?1 to the second temperature T2.