Dishwasher Spray Rotor Assembly for Stable Multi-Level Water Flow
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Solution Overview
Problem
Conventional dishwashers with multiple rotors face issues such as foreign substances getting caught between the rotors, rotor instability, and flow loss during water introduction, leading to inefficient washing and potential contamination.
Innovation Solution
The dishwasher incorporates a spray device with a first and second spray rotor, where the second rotor is rotatably coupled to a shaft with a shaft hole and communication hole, and a holder to support the rotor, reducing friction and leakage through guide protrusions and sealing members, and a supporting tube to stabilize the shaft, eliminating the need for separate bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple rotors are coupled together to spray washing water, then washing coverage is improved, but foreign substances may be caught between the rotors and rotor stability deteriorates
Solution Approach 1:
The spray device is divided into multiple independent rotors (first rotor, second rotor, third rotor) that can be separately assembled and disassembled. Each rotor has its own spray arms and nozzles, allowing them to be positioned at different heights and angles to achieve comprehensive washing coverage without interfering with each other's rotation stability
Solution Approach 2:
A support structure with support arms connects the multiple rotors to the housing, acting as an intermediary that provides stable mounting positions for each rotor. The support arms are fixed to the housing and extend to hold the rotors at appropriate positions, preventing the rotors from contacting each other while maintaining their rotational stability
2Productivity
If multiple rotors are coupled together to increase washing coverage, then washing efficiency is improved, but the structure becomes complex and difficult to manufacture
Solution Approach 1:
The spray device is divided into multiple independent rotors (first rotor, second rotor, third rotor) that can be separately assembled and disassembled. Each rotor has its own spray arms and nozzles, allowing them to be positioned at different heights and angles to achieve comprehensive washing coverage without interfering with each other's rotation stability
Solution Approach 2:
Multiple rotors serve universal functions of spraying washing water onto dishes from different positions and angles. Each rotor can be configured with spray arms extending in different directions to cover various areas of the washing chamber, making the system adaptable to different washing needs while maintaining a relatively simple modular structure
3Area of stationary object
If washing water is pumped from the sump to multiple rotors, then washing coverage is improved, but flow loss increases
Solution Approach 1:
The rotors are positioned at different heights (upper, middle, lower positions) along the vertical axis of the washing chamber, allowing washing water to be sprayed continuously from top to bottom. This vertical arrangement enables the water flow to act on dishes at multiple levels in sequence, maximizing the utilization of each unit of water and reducing flow loss while improving overall washing coverage
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 design enhances the stability of the rotor system, reduces pressure loss, and prevents foreign substances from being caught, resulting in improved washing efficiency and ease of cleaning.
Implementation Method 1
a rotation guide formed in the shaft hole to reduce friction with the shaft
Data Source
AI summary
A dishwasher includes a tub, a basket, a spray device configured to spray washing water, and a sump configured to supply the washing water to the spray device. The spray device includes a first spray rotor including a first spray arm and a shaft integrally formed with the first spray arm to guide the washing water supplied from the sump to the first spray arm, a second spray rotor rotatably coupled to the shaft and including a second spray arm configured to spray the washing water branched from the washing water guided to the first spray arm through the shaft, and a shaft hole formed in the second spray arm to allow the shaft to pass therethrough, and a communication hole formed in the shaft to allow the shaft to communicate with the second spray arm.