Dishwasher Vane Control for Self-Cleaning Filter Flow
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Solution Overview
Problem
Dish washing machines often leave garbage at the bottom of the washing tub and on the filter, leading to user dissatisfaction and maintenance challenges.
Innovation Solution
A dish washing machine with a vane that moves between two positions to change the spray direction of washing water, allowing it to effectively remove garbage from the filter by rotating and deflecting the water to strike the rear wall of the tub, combined with a controller to manage the pump's rotation speed and water flow for optimal cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is installed at the bottom of the washing tub to filter garbage, then washing water can be cleaned, but garbage accumulates on the filter and at the bottom of the tub
Solution Approach 1:
The system automatically cleans the filter by redirecting washing water to flow over the filter surface, enabling self-cleaning without manual intervention. The controller automatically manages the vane rotation and water flow to remove accumulated garbage from the filter
Solution Approach 2:
The vane is designed to rotate between different positions to dynamically change the spray direction of washing water. This dynamic adjustment allows the system to switch between normal washing mode and filter cleaning mode, optimizing water flow direction based on operational requirements
2Reliability
If washing water is sprayed continuously, then washing performance is maintained, but energy consumption increases
Solution Approach 1:
The system implements periodic action by alternating between normal washing operation and filter cleaning operation. The controller manages the pump to operate at different phases - maintaining washing performance during normal operation and redirecting water flow periodically to clean the filter, thereby optimizing energy usage across the complete washing cycle
3Productivity
If the vane moves to change spray direction, then garbage removal capability is improved, but device complexity increases
Solution Approach 1:
The system segments the washing operation into distinct phases: normal washing mode and filter cleaning mode. The vane has specific positioned states for each phase, with the controller managing transitions between these segmented operational states, simplifying the control logic despite the added mechanical component
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
The solution ensures effective removal of garbage from the filter and bottom of the tub, improving washing performance and reducing user inconvenience by automatically washing the filter and preventing blockages.
Implementation Method 1
a pump which pumps and supplies the washing water stored in the sump to the nozzle
Implementation Method 2
the vane rotates toward the nozzle to allow the washing water sprayed by the nozzle to face a rear wall of the washing tub
Implementation Method 3
a filter installed on a bottom surface of the washing tub and filters garbage in the washing water
Implementation Method 4
removes the garbage which remains at the filter by rotation of the vane
Data Source
AI summary
Provided are a dish washing machine and a controlling method thereof. When water is sprayed from a nozzle while a vane is positioned at a reference position during a drainage operation, since a deflection angle of the vane is bent back and the water is sprayed toward a rear wall of a washing tub, the water forms a fast and strong water current over a bottom plate of the washing tub to remove garbage which remains at a filter while flowing over the bottom of the washing tub. Accumulation at a filter at a top end of a sump and that may block the filter during washing such as preliminary washing, main washing, etc., is washed, thereby eliminating the inconvenience of having to separate and wash the filter, and effectively improves performance by avoiding poor circulation of water that may occur due to a filter blockage or generation of bubbles.