Pressure-Actuated Diverter for Selective Spray Arm Flow in Dishwashers
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Solution Overview
Problem
Conventional dishwashers face challenges in efficiently controlling fluid flow among spray arms, leading to increased energy consumption, water usage, and complexity due to complex valve assemblies and mechanisms, limiting the ability to selectively operate specific spray devices for improved energy efficiency and cleaning.
Innovation Solution
A diverter mechanism with a normally-closed valve that opens at a predetermined pressure to direct fluid flow between upper and lower spray arm assemblies or upper and middle spray arm assemblies, allowing for more flexible operation without complex solenoid mechanisms and reduced fluid volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex valve assemblies and multi-channel conduits are used to selectively activate spray arms, then fluid flow control capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent divides the fluid distribution system into separate single-channel conduits for each spray arm location. Instead of using complex multi-channel conduits with integrated valve assemblies, the system segments the fluid delivery into independent pathways that can be selectively activated by simple diverter valves positioned at each spray arm location.
Solution Approach 2:
The patent extracts the valve mechanism from a centralized complex assembly and distributes simple diverter valves to individual spray arm locations. This removes the need for complex multi-channel conduits and centralized valve assemblies, simplifying the overall system while maintaining selective activation capability.
2Productivity
If multiple spray arms operate simultaneously, then cleaning coverage is improved, but energy consumption and water usage increase
Solution Approach 1:
The patent implements dynamic selection of spray arm operation through simple diverter valves that can be adjusted based on washing needs. This allows the system to adaptively activate only the necessary spray arms for each washing scenario, optimizing the balance between cleaning coverage and energy/water consumption rather than operating all spray arms simultaneously or using fixed configurations.
3Adaptability or versatility
If conventional valve mechanisms are used for diverter operation, then fluid flow selection is improved, but device complexity and cost increase
Solution Approach 1:
The patent employs simple, inexpensive diverter valves at each spray arm location that can be easily manufactured and replaced if needed. These basic valves provide sufficient functionality for fluid flow selection without the complexity and cost of conventional solenoid or multi-channel valve mechanisms, aligning with the principle of using simple, cost-effective 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
The diverter provides enhanced control over fluid distribution, reducing energy consumption and water usage while enabling more efficient operation of dishwasher spray devices, thereby improving energy efficiency and cleaning effectiveness.
Implementation Method 1
a valve moveable between i) a closed position where the valve is seated against the exit port so as to block fluid flow from the main supply conduit and ii) an open position where the valve is positioned away from the exit port when fluid pressure at the exit port exceeds a predetermined value
Data Source
AI summary
A diverter for a dishwasher appliance that can be used to provide more options for directing fluid among various spray arms or spray devices in a dishwasher appliance. The diverter can be used e.g., to select between fluid delivery to both the upper and lower spray arm assemblies or to both the upper and middle spray arm assemblies.