Dishwasher Upper-Wall Spray Design for Inner Door Cleaning
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Solution Overview
Problem
Conventional dishwashing machines face difficulties in effectively cleaning the inner door and storm door due to the direction of washing water jets, which often result in incomplete dirt removal and increased noise, especially with crockery baskets having plastic parts that create shadow zones, and the existing solutions do not utilize the available pressure effectively to clean the storm door.
Innovation Solution
The dishwashing machine incorporates spraying means on the upper wall to direct washing water between the inner door and the fronts of the baskets, allowing for direct and pressured cleaning of the storm door and basket fronts, ensuring thorough dirt removal without excessive noise, and includes a hydraulic distributor to optimize water supply during the wash cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If washing water jets are directed at the storm door to clean it, then cleaning effectiveness improves, but impact noise increases
Solution Approach 1:
The patent applies different jet directions to different zones: tangential jets for the storm door surface (cleaning without impact noise) and direct jets for the inner door (effective cleaning). This local differentiation resolves the contradiction by optimizing jet direction for each specific cleaning target.
Solution Approach 2:
The cleaning function is segmented into two independent systems: one for the storm door (tangential jets from upper wall) and one for the inner door (direct jets). This segmentation allows each system to be optimized independently, achieving both low noise and effective cleaning.
2Reliability
If conventional spray means are used to clean both dishes and tank walls, then overall cleaning is achieved, but shadow zones behind plastic basket parts remain uncleansed
Solution Approach 1:
The patent introduces a new spatial dimension for cleaning by placing spray nozzles on the upper tank wall to direct jets horizontally across the storm door and inner door surfaces. This dimensional change allows cleaning of areas previously inaccessible to conventional spray arms, eliminating shadow zones behind basket parts.
Solution Approach 2:
The storm door acts as an intermediary surface that channels washing water flow between the spray nozzles and the inner door. The water flows over the storm door first, then continues to clean the inner door, creating a cascading cleaning effect that covers all surfaces including shadow zones.
3Quantity of substance
If wire baskets are used to allow water spread, then water circulation improves, but dirt from the inner door is not channeled and requires additional spray action
Solution Approach 1:
The storm door serves multiple functions: it acts as a cleaning surface for tangential jets, channels water flow to the inner door, and prevents direct water impact noise. This multi-functionality reduces the need for additional spray actions while maintaining effective cleaning.
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 solution enables effective cleaning of the inner door and storm door by utilizing the pressure of the washing water jets to remove dirt, ensuring thorough cleaning and minimizing noise, while also allowing for efficient detergent distribution and reduced water consumption by optimizing the wash cycle.
Implementation Method 1
sprinkler means sprays wash water directly onto the storm door
Implementation Method 2
The spraying means are arranged on the upper wall of the washing tank to spray washing water under pressure in an area between the inner door and the fronts of the baskets
Data Source
AI summary
The machine has a washing tub with a front side (3) closed by a door (4) comprising an outer wall (22) and an inner door (23) provided with washing product case. The tub has dish racks comprising walls (24) opposite to the side (3). Spraying unit sprays washing water on dishes disposed in the tub. Sprinkling unit (39) is arranged on an upper wall (28) of the tub to sprinkle water under pressure in a zone (40) comprised between the inner door and the walls (24). The unit (39) sprays the water directly on the inner door. The tub has is divided into washing zones with distinct drying temperature. An independent claim is also included for a method for washing dishes in a dish washing and drying machine.