Nozzle assembly for a dishwasher
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Solution Overview
Problem
Conventional dishwasher nozzle assemblies create dead zones within the washing tub where wash water does not reach, leading to incomplete cleaning of dishware.
Innovation Solution
A nozzle assembly design featuring a rotating nozzle with an inside rotor and outside rotor case, or a rotor with an eccentric rotation guide, which allows for the nozzle to revolve and rotate around a center, ensuring wash water is sprayed evenly across the entire tub without the need for a separate driving force, utilizing the reaction force from the water spray to drive the rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the nozzle assembly is disposed at a fixed position to spray wash water, then the structure is simple, but dead zones are created where wash water does not reach
Solution Approach 1:
The nozzle assembly is transformed from a fixed structure to a dynamic rotating structure. The nozzle rotates around its own axis while the entire assembly revolves around the washing tub center, enabling comprehensive coverage of all areas including previously unreachable dead zones.
Solution Approach 2:
The nozzle system is divided into multiple functional components: the nozzle itself, the inner rotor that rotates with the nozzle, and the outer rotor case that guides the revolving motion. This segmentation allows independent optimization of rotation and revolution mechanisms.
2Reliability
If a separate driving force is added to rotate the nozzle, then the spray coverage is improved, but the device complexity and energy consumption increase
Solution Approach 1:
The nozzle assembly utilizes the reaction force from the sprayed wash water itself to drive its rotation and revolution. The water jet creates a reactive torque that automatically rotates the nozzle around its axis and drives the inner rotor, eliminating the need for external motors or power sources.
Solution Approach 2:
The reaction force from the water spray, which could be considered a waste or byproduct, is converted into a useful driving force. This reaction force powers both the rotation of the nozzle and the revolution of the entire assembly, turning a potentially harmful force into a beneficial self-propulsion mechanism.
3Reliability
If the nozzle rotates on its axis, then the spray pattern is improved, but the structural complexity increases
Solution Approach 1:
The rotation function and the revolution function are merged into a single integrated rotor mechanism. The inner rotor rotates with the nozzle while simultaneously being driven by the reaction force to revolve around the outer rotor case, combining two motion functions in one structure.
Solution Approach 2:
The rotor mechanism serves multiple functions: it enables the nozzle to rotate for pattern control, allows the assembly to revolve for coverage, and acts as the structural connection between the nozzle and the washing tub. This multi-functionality reduces the need for separate components.
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
Ensures thorough coverage of wash water within the washing tub, effectively eliminating dead zones and enhancing cleaning efficiency by allowing the nozzle to reach all corners without additional mechanical assistance.
Implementation Method 1
At least one of the nozzle and the inside rotor may be rotated by a reaction against the wash water sprayed from the outlet hole
Data Source
AI summary
A nozzle assembly for spraying wash water at an inside a washing tub and a dishwasher having the same, the nozzle assembly including a nozzle configured to rotate on a rotating axis thereof, an inside rotor having a shape of a cylinder and configured to rotate according to a rotation of the nozzle while coupled to the rotating axis, and an outside rotor case having a larger radius than a radius of the inside rotor to accommodate the inside rotor therein, and having an opening hole through which the rotating axis passes, and the rotating axis of the nozzle revolves around a circumference of the opening hole.