Dishwasher comprising a nozzle assembly
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Solution Overview
Problem
Conventional dishwasher nozzle assemblies create dead zones within the washing tub where wash water cannot reach, leading to incomplete cleaning of dishware.
Innovation Solution
A nozzle assembly comprising a rotating nozzle with an inside rotor and an outside rotor case, where the rotating axis revolves around the center of the outside rotor case, and the nozzle is designed with inclined outlet ports to ensure wash water is sprayed to all corners of the tub, utilizing the reaction force of the sprayed water to drive rotation without a separate driving mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the nozzle assembly is disposed to spray wash water at a fixed position, then the structure is simple, but dead zones are created where wash water cannot 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 center of the washing tub, creating continuous motion that eliminates dead zones and ensures comprehensive water coverage across all surfaces.
Solution Approach 2:
The nozzle assembly adds rotational and revolutionary movements to transition from a single-point fixed spray to a multi-dimensional coverage pattern. By rotating around its axis and revolving around the tub center, the nozzle covers multiple spatial dimensions, eliminating blind spots.
2Reliability
If a separate driving mechanism is added to rotate the nozzle, then the cleaning coverage is improved, but the device complexity increases
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 torque that automatically rotates the nozzle around its axis and propels the assembly to revolve around the center, eliminating the need for external motors or driving mechanisms.
Solution Approach 2:
The reaction force from the sprayed water, which could be considered waste energy, is converted into the driving force for rotation and revolution. This transforms what would normally be a byproduct into a useful function that enables comprehensive coverage without additional complexity.
3Device complexity
If the nozzle rotates on a fixed axis, then the structure is simple, but wash water cannot reach all corners of the washing tub
Solution Approach 1:
The system transitions from simple rotation around a fixed axis to a compound motion involving both rotation around the nozzle's own axis and revolution around the washing tub center. This two-dimensional motion pattern ensures water reaches all corners and surfaces of the tub.
Solution Approach 2:
The nozzle assembly employs dynamic motion where the rotation axis itself moves in a circular path around the tub center. This creates a sweeping motion that covers the entire washing area, transforming a static single-axis rotation into a dynamic multi-position coverage system.
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
The design ensures thorough cleaning by reaching all areas of the washing tub, eliminating dead zones and providing efficient water distribution without the need for additional driving forces, resulting in improved cleaning efficacy.
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
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AI summary
A nozzle assembly (100) capable of evenly spraying wash water at an inside a washing tub (20) and a dishwasher having the same, the nozzle assembly (100) including a nozzle (110) configured to rotate on a rotating axis (C110) thereof, an inside rotor (120) having a shape of a cylinder and configured to rotate according to a rotation of the nozzle (110) while coupled to the rotating axis (C110), and an outside rotor case (130) having a larger radius than a radius of the inside rotor (120) to accommodate the inside rotor (120) therein, and having an opening hole (141) through which the rotating axis passes (C110), and the rotating axis (C110) of the nozzle (110) revolves around a circumference of the opening hole (141).