Dual-Flow Dishwasher Nozzle Assembly for Lower Wash Tub Noise
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Solution Overview
Problem
Conventional dishwasher nozzle assemblies generate noise due to collisions between wash water and the wash tub when rotated, as they spray water directly towards the detergent box.
Innovation Solution
The nozzle assembly features a dual flow path system, where the first flow path sprays water towards objects for washing and the second flow path is controllable to direct water only towards the detergent box, minimizing unnecessary water contact with the wash tub by switching between open and closed states based on the sub nozzle's position relative to the detergent box.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the nozzle assembly sprays wash water while rotated rearward of the dishwasher, then the detergent box can be washed, but noise is generated due to collision between wash water and the wash tub
Solution Approach 1:
The nozzle assembly is divided into a main body and a rotatable sub-nozzle. The sub-nozzle can independently rotate to direct wash water toward the detergent box, while the main body remains positioned to avoid water collision with the wash tub. This segmentation allows the washing function to be separated from the noise-generating collision issue.
Solution Approach 2:
The washing function for the detergent box is extracted as a separate, controllable operation through the rotatable sub-nozzle. The sub-nozzle can be selectively activated to spray water at the detergent box while the main nozzle body maintains a position that prevents water from colliding with the wash tub, thereby removing the source of noise while preserving the washing capability.
2Ease of operation
If the nozzle assembly sprays wash water towards the detergent box, then the detergent box is washed, but wash water collides with the wash tub generating noise
Solution Approach 1:
The sub-nozzle is designed to be rotatable relative to the main body, providing dynamic positioning capability. This allows the system to adaptively direct water flow toward the detergent box when needed while repositioning to prevent water collision with the wash tub, thereby eliminating noise while maintaining cleaning functionality.
Solution Approach 2:
The rotatable sub-nozzle acts as an intermediary between the main nozzle body and the detergent box. It receives water from the main body and redirects it toward the detergent box, enabling the washing function to be performed without the main nozzle body directly facing the wash tub, thus preventing noise-generating collisions.
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 reduces noise generation by minimizing the contact area between wash water and the wash tub, ensuring effective washing while preventing unintended water leakage and enhancing operational efficiency.
Implementation Method 1
a first flow path and a second flow path independent of each other, wherein the first flow path allows wash water to be sprayed out towards objects to be washed in the wash tub, and the second flow path allows wash water to be sprayed out towards a detergent box
Data Source
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AI summary
A nozzle assembly and a dishwasher having the same. The dishwasher (1) includes a main body (101), a wash tub (103), and at least one first nozzle assembly (200) to wash the objects received in the wash tub. The first nozzle assembly (200) includes a main nozzle (210) configured to be rotatable about a rotation axis thereof, plural injection holes, a first flow path defined in the main nozzle for movement of wash water to be sprayed out toward the objects, a sub nozzle (220) provided at the main nozzle, the sub nozzle internally defining a second flow path for movement of wash water to be sprayed out in a radial direction of the main nozzle (210), and a valve (230) coupled to the main nozzle (210) to open or close the second flow path. Providing the nozzle assembly with the first and second flow paths independent of each other may reduce noise due to collision of wash water.