Domestic dishwasher and method
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Solution Overview
Problem
Existing dishwashers struggle to reliably clean the interiors of bottles with varying sizes and shapes, particularly tall bottles, due to user misalignment of holding facilities and component tolerances, leading to inadequate cleaning of the bottle interiors.
Innovation Solution
A dishwasher with an actively driven spray arm and an open-loop and closed-loop control system that adjusts its rotational movement based on the position of the holding facility to ensure the spray arm pauses near the washware, allowing wash liquor to effectively clean the washware, regardless of user positioning or component tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the holding facility is positioned freely by the user in the washware receptacle, then the ease of operation is improved, but the reliability of cleaning the washware interior is worsened due to misalignment with the spray arm
Solution Approach 1:
The spray arm transitions from passive rotation to active driven rotation with programmable control. The control facility enables the spray arm to pause at specific positions corresponding to the holding facility location, dynamically adapting the spraying pattern to ensure reliable cleaning regardless of user positioning variations
Solution Approach 2:
The control facility receives input about the holding facility position (either pre-programmed or detected) and uses this information to adjust the spray arm's rotational movement, creating a feedback loop that ensures the spray jets are directed accurately into the washware opening even when user positioning varies
2Productivity
If the spray arm rotates continuously to cover all areas, then the productivity is improved, but the cleaning effectiveness of specific washware areas is worsened due to insufficient pause time
Solution Approach 1:
The spray arm rotation is converted from continuous motion to periodic action with programmed pauses. The control facility directs the spray arm to pause at predetermined positions where washware is located, maintaining overall washing productivity while ensuring sufficient contact time for effective cleaning at each position
Solution Approach 2:
The control facility is pre-programmed with position information about where the holding facility is located in the washware receptacle. This preliminary information allows the spray arm to be directed accurately to the correct positions and pause long enough to ensure thorough cleaning before moving to the next position
Data Source
AI summary
A household dishwasher includes a washware receptacle, a holding facility positioned in or on the washware receptacle to hold washware, an actively driven spray arm, and an open-loop and closed-loop control facility designed to influence a rotational movement of the spray arm as a function of a position of the holding facility in or on the washware receptacle so that the spray arm pauses close to the holding facility to apply wash liquor and/or fresh water to the washware held by the holding facility.