Rotating Dishwasher Nozzle With Dual Flow Paths for Noise Control
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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 rotatable main nozzle with a sub-nozzle that controls wash water flow paths, allowing for directional adjustment to prevent wash water from colliding with the wash tub, incorporating a valve to open or close the second flow path based on the nozzle's rotation, and a shock-absorbing member to reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the nozzle assembly sprays wash water while rotated rearward to wash the detergent box, then the washing function is improved, 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 nozzle and a sub-nozzle. The main nozzle sprays wash water toward the detergent box for washing, while the sub-nozzle sprays wash water toward the wash tub to prevent noise-generating collisions. This segmentation allows different parts of the system to perform different functions simultaneously, resolving the contradiction between washing effectiveness and noise reduction.
Solution Approach 2:
The sub-nozzle acts as an intermediary element that intercepts wash water before it collides with the wash tub. By introducing this intermediate component, the harmful collision is prevented while the primary washing function of the main nozzle remains intact. The sub-nozzle mediates between the water spray and the wash tub surface.
2Adaptability or versatility
If the nozzle assembly rotates to change injection direction, then adaptability is improved, but friction and resistance increase
Solution Approach 1:
The nozzle assembly utilizes the kinetic energy of the rotating nozzle itself to spray wash water in different directions. The rotation of the nozzle body automatically directs the spray without requiring additional actuators or mechanisms. This self-service approach reduces mechanical friction and resistance while maintaining adaptability in injection direction.
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 by controlling wash water direction and minimizing contact with the wash tub, ensuring efficient washing while minimizing noise generation.
Implementation Method 1
a valve coupled to the main nozzle to open or close the second flow path
Implementation Method 2
incorporating a valve to open or close the second flow path based on the nozzle's rotation, and a shock-absorbing member to reduce friction
Data Source
AI summary
A nozzle assembly and a dishwasher having the same. The dishwasher includes a main body, a wash tub, and at least one first nozzle assembly to wash the objects received in the wash tub. The first nozzle assembly includes a main nozzle 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 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, and a valve coupled to the main nozzle 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.