Dishwasher Spray Arm Layout With Magnetic Speed Synchronization
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Solution Overview
Problem
Domestic dishwashers with traditional spray arm configurations face inefficiencies in washing liquor distribution due to the shape of the washing compartment, leading to areas that cannot be optimally loaded, and require mechanical coupling for synchronization of multiple spray arms, which increases complexity and space requirements.
Innovation Solution
A domestic dishwasher design featuring multiple spray arms in a common plane with magnetic fields of the same polarization to synchronize their rotation without mechanical coupling, ensuring efficient washing liquor distribution and minimizing space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple spray arms are arranged in different spray arm planes, then spray coverage is improved, but device complexity increases due to required mechanical coupling for synchronization
Solution Approach 1:
The patent replaces mechanical coupling devices (belts, pulleys, gears, stepper motors, electronic brakes) with a magnetic field-based synchronizing device. The magnetic field interacts with magnetizable elements on the spray arms to synchronize their rotation without direct mechanical contact, thereby reducing device complexity while maintaining synchronized operation of multiple spray arms in different planes.
Solution Approach 2:
The magnetic field serves as an intermediary between the spray arms, enabling synchronization without mechanical coupling. The magnetic field transmits rotational information and control between spray arms through magnetic interaction with magnetizable elements, acting as a non-contact mediator that simplifies the overall system architecture.
2Productivity
If multiple spray arms are used to minimize spray shadows, then washing efficiency is improved, but space requirements increase
Solution Approach 1:
The patent arranges multiple spray arms in different spray arm planes (vertical stacking) rather than spreading them out horizontally. This dimensional reorganization allows multiple spray arms to operate in a compact vertical space, maintaining comprehensive spray coverage while minimizing the horizontal footprint and overall space requirements of the dishwasher.
3Speed
If mechanical coupling devices are used for spray arm synchronization, then rotational speed matching is achieved, but noise and energy consumption increase
Solution Approach 1:
The patent eliminates mechanical coupling devices (belts, pulleys, gears, stepper motors, electronic brakes) that generate noise and consume energy, replacing them with a magnetic field-based synchronizing system. The magnetic field interacts with magnetizable elements on the spray arms to synchronize rotation without mechanical contact, friction, or electrical power consumption during operation, thereby reducing noise and energy consumption while maintaining speed synchronization.
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 magnetic synchronization allows for synchronized rotational speeds of spray arms, ensuring intensive washing liquor exposure in overlapping areas, reducing mechanical complexity, space requirements, and enhancing cleaning efficiency while minimizing noise and energy consumption.
Implementation Method 1
the first and second magnetic fields have the same polarity, such that during operation of the household dishwasher, the first and second magnetic fields repel each other to prevent contact between the first and second spray arms during rotation
Implementation Method 2
The synchronizing device includes a first magnetic field associated with the first spray arm and a second magnetic field associated with the second spray arm, wherein the first and second magnetic fields have the same polarity
Data Source
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AI summary
The invention relates to a domestic dishwasher (1) having a first spray arm (15), which has a first spray circle (19), having a second spray arm (20), which has a second spray circle (24) overlapping with the first spray circle (19), and having a synchronizing device (41), which is intended to adapt a rotational speed of the first spray arm (15) to a rotational speed of the second spray arm (20), or vice versa, wherein the synchronizing device (41) has a first magnetic field (42), which is assigned to the first spray arm (15), and a second magnetic field (43), which is assigned to the second spray arm (20), wherein the first magnetic field (42) and the second magnetic field (43) have the same polarization, and therefore the first magnetic field (42) and the second magnetic field (43) repel one another during operation of the domestic dishwasher (1), so as to prevent contact between the first spray arm (15) and the second spray arm (20) when said arms are rotating.