Dishwasher Rack Adjustment Mechanism for Comprehensive Spray Coverage
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Solution Overview
Problem
Dishwashers often fail to satisfactorily wash items due to the typical orientation of washing racks being perpendicular to the upwardly sprayed water, resulting in incomplete cleaning, particularly for items like plates where front and rear faces are not fully subjected to the spray water.
Innovation Solution
A dishwasher with an adjustment mechanism comprising independently controllable adjusters at each corner of the washing compartment, allowing the rack to be tilted and adjusted in height and orientation according to a pre-determined program, ensuring comprehensive exposure to spray water by moving the rack from one orientation to another during a washing cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rack is kept in a fixed perpendicular orientation to the spray water, then the device structure is simple, but the washing effectiveness is insufficient as items are not thoroughly cleaned
Solution Approach 1:
The rack is transformed from a static fixed-orientation structure to a dynamic adjustable structure. Four independently controllable adjusters are installed at the corners of the rack, enabling each corner to be adjusted individually. This allows the rack to change its orientation and angle during the washing cycle, dynamically adapting to maximize exposure to spray water and improve washing effectiveness on both front and rear faces of items.
Solution Approach 2:
The rack adjustment system is segmented into four independent adjusters located at each corner of the rack. Each adjuster can be controlled independently by the controller, allowing selective adjustment of different rack corners to achieve optimal orientation for washing different types of items. This segmentation provides flexibility and precision in controlling rack position and angle.
2Reliability
If the rack orientation is adjusted during washing, then comprehensive exposure to spray water is achieved, but the device complexity increases with multiple adjusters and control systems
Solution Approach 1:
The four corner adjusters serve multiple functions: they can adjust rack height, tilt angle, and rotational orientation. The same adjuster mechanism is used for different adjustment purposes, reducing the need for separate mechanisms for each function. The controller integrates the control of all adjusters, providing universal control for the entire rack positioning system.
Solution Approach 2:
The controller automatically controls the adjusters based on pre-programmed sequences, enabling the rack to self-adjust to optimal positions without manual intervention. The system performs multiple adjustment cycles automatically during the washing process, with the controller managing the timing and coordination of all four adjusters to achieve comprehensive washing coverage.
Data Source
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AI summary
There is disclosed a dishwasher. The dishwasher comprises a controller (234). The dishwasher further comprises a washing compartment (204) having a first corner region (262), a second corner region (264), a third corner region (266) and a fourth corner region (268). The dishwasher also comprises a rack (212) arranged in the washing compartment (204) for holding one or more items to be washed. An adjustment mechanism (277) is provided for adjusting a position and/or orientation of the rack (212) in the washing compartment. The adjustment mechanism (277) comprises a first adjuster (278) located at the first corner region of the washing compartment, a second adjuster (280) located at the second corner region of the washing compartment, a third adjuster (282) located at the third corner region of the washing compartment, and a fourth adjuster (284) located at the fourth corner region of the washing compartment. Each of the first to fourth adjusters is independently adjustable by the controller (234).