Dishwasher Switching Unit for Diverted Spray-Arm Water Flow
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Solution Overview
Problem
Conventional dishwashers face challenges in efficiently rotating the spray arm without a separate driving mechanism, leading to reduced washing efficiency and potential clogging due to foreign substances.
Innovation Solution
The dishwasher incorporates a spray arm assembly with a rotary gear unit and link member system, where the rotary gear unit engages with the fixed gear unit to rotate the auxiliary arms, utilizing the repulsive force generated by water spray to rotate the main arm, and an elastic unit to maintain gear coupling, ensuring efficient washing without a separate driving source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate driving mechanism is used to rotate the spray arm, then rotation control is improved, but device complexity increases
Solution Approach 1:
The spray arm assembly rotates itself by utilizing the repulsive force generated from the water spray. The water flow creates a reaction force that automatically drives the rotation of the main arm and auxiliary arms, eliminating the need for an external driving mechanism while maintaining operational effectiveness.
Solution Approach 2:
The patent replaces a mechanical driving system (motor, gears, belts) with a fluid dynamics-based system. The repulsive force from water spray, governed by fluid mechanics principles, substitutes for the mechanical driving force, simplifying the overall system architecture.
2Area of stationary object
If water flow is diverted to multiple passages, then washing coverage is improved, but flow distribution control becomes more difficult
Solution Approach 1:
The water flow is divided into multiple separate flow passages, each serving different spray functions. The main flow passage supplies the main arm while the auxiliary flow passage supplies the auxiliary arms, creating segmented flow paths that simplify control and improve washing coverage through distributed spraying.
Solution Approach 2:
The switching unit acts as an intermediary component that controls the distribution of water flow between different passages. It mediates the flow allocation based on operational requirements, enabling easy control of washing coverage without complex distribution mechanisms.
3Reliability
If gear coupling is maintained under water pressure, then rotational transmission is improved, but gear disengagement becomes difficult
Solution Approach 1:
The gear coupling system is designed to be dynamic rather than static. The gears can automatically engage and disengage based on the operational state and water pressure conditions, allowing reliable rotational transmission during operation while enabling easy disengagement when needed through natural pressure changes.
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 solution enables efficient rotation of the spray arm and auxiliary arms, enhancing washing efficiency while preventing clogging and reducing operational complexity, as the repulsive force from water spray drives the rotation, and the elastic unit maintains gear coupling, ensuring consistent performance.
Implementation Method 1
The spray arm may be configured to rotate by a repulsive force generated based on water being sprayed through spray holes in the main arm or each of the pair of the auxiliary arms
Implementation Method 2
a rotary gear unit rotatably mounted on the spray arm and configured to engage the gear teeth of the fixed gear unit
Implementation Method 3
an elastic unit to maintain gear coupling
Data Source
AI summary
A dishwasher may include a tub configured to accommodate one or more items to be washed, a spray arm rotatably mounted to the tub, and configured to spray water onto the one or more items to be washed, a sump disposed at a bottom surface of the tub and configured to store water and to supply stored water to the spray arm, a fixed gear unit fixed to the tub with gear teeth arranged along an outer circumferential surface of the fixed gear unit, a rotary gear unit rotatably mounted on the spray arm and configured to engage the gear teeth of the fixed gear unit, and a link member connected to the rotary gear unit and the spray arm, where the spray arm may include, a main arm with a pair of arms, and a pair of auxiliary arms rotatably connected to the main arm.