Dishwasher Top Nozzle Layout for Uniform Rack Water Distribution
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Solution Overview
Problem
Conventional dishwashing machines face challenges in efficiently utilizing the washing space due to the placement and rotation of spray arms, which restrict the size of objects that can be washed and hinder uniform water distribution, particularly when a third arm is positioned above the upper rack, limiting the tub's volume and washing efficiency.
Innovation Solution
The dishwashing machine incorporates a top nozzle with an asymmetric impeller and a channel change device that adjusts water flow based on pressure, allowing for uniform water distribution across the upper and lower racks, and a tower nozzle that extends to the upper rack, optimizing space utilization and washing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a third arm is positioned above the upper rack to spray wash water, then washing coverage is improved, but the tub volume is reduced and space utilization is hindered
Solution Approach 1:
The third arm positioned above the upper rack is extracted and replaced by a top nozzle integrated into the tub structure. This removes the space-consuming arm while maintaining washing coverage through strategically positioned spray holes that direct water onto the upper rack and surrounding areas.
Solution Approach 2:
The top nozzle merges multiple functions: it provides washing coverage for the upper rack, contributes to overall tub washing, and maintains tub volume by being integrated into the tub structure rather than occupying separate arm space. The nozzle body with its spray holes combines washing functionality with space-efficient design.
2Quantity of substance
If spray arms are rotated to improve water distribution, then washing uniformity is enhanced, but the size of objects that can be washed is restricted
Solution Approach 1:
The water distribution system is segmented into multiple independent nozzles (top nozzle, front nozzle, rear nozzle) with spray holes positioned at different locations and angles. This segmentation allows water to be distributed uniformly across the tub and racks without requiring rotation, accommodating larger objects that cannot be washed by rotating arms.
Solution Approach 2:
Instead of achieving water distribution through rotation in the horizontal plane, the invention uses vertical positioning and angular orientation of spray holes in three-dimensional space. The top nozzle's spray holes are arranged to cover the upper rack from above, while front and rear nozzles provide additional coverage, creating uniform distribution without rotational movement.
3Reliability
If conventional spray arms are used, then washing function is provided, but channel clogging occurs and washing efficiency is reduced
Solution Approach 1:
The nozzles are designed with locally optimized spray hole configurations tailored to specific washing needs. The top nozzle has spray holes positioned to target the upper rack, while front and rear nozzles have different orientations. This localized optimization ensures effective washing in each area while preventing clogging through appropriate hole sizing and positioning.
Solution Approach 2:
The invention changes key parameters of the spray system: instead of using large-diameter spray arms with few holes, it employs multiple nozzles with numerous smaller spray holes. This parameter change improves water distribution uniformity, reduces clogging risks through smaller hole sizes that are less prone to blockage, and enhances washing efficiency by targeting specific areas effectively.
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 configuration enhances washing efficiency by ensuring uniform water supply to all areas of the racks, reducing clogging risks, and allowing for larger objects to be washed within the tub's space, thereby improving overall washing performance and space utilization.
Implementation Method 1
an asymmetric impeller that is rotatable about a shaft, the impeller being provided with a first hole and a second hole extending from the shaft to an edge of the impeller body, a distance from the shaft to the first hole being greater than a distance from the shaft to the second hole
Implementation Method 2
a water supply pump to supply wash water
Data Source
AI summary
A dishwashing machine is provided. The dishwashing machine may include a rack disposed in a tub to provide a washing space to receive objects to be washed, a water supply pump to supply wash water, a nozzle body disposed at an upper side of the rack to receive the wash water from the water supply pump, a discharge hole provided at the nozzle body to discharge the wash water supplied to the nozzle body to the rack, and an asymmetric impeller rotatably provided at the nozzle body to supply the wash water discharged from the discharge hole to at least two divided areas of the rack.