Multi-Feed Dishwasher Rack Coupling for Adjustable Spray Coverage
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Solution Overview
Problem
Existing dishwasher systems lack an efficient configuration for delivering washing fluid to multiple, vertically adjustable spray arms, leading to inadequate cleaning coverage and flow distribution.
Innovation Solution
A dishwasher system featuring a movable rack with multiple spray arms, including a rotatable spray arm and a bifurcated spray arm unit, utilizing a multi-tube feed arrangement and a manifold with internal ports for selective fluid distribution, and a diverter valve mechanism to control fluid flow based on washing cycle selections and timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single fluid connection is used for the intermediate spray arm, then the structure is simple, but uniform fluid distribution to all spray arms cannot be achieved when the upper rack is vertically adjusted
Solution Approach 1:
The fluid distribution system is segmented into multiple independent fluid connections (first fluid connection and second fluid connection) that can be selectively engaged. Each connection serves specific spray arms, allowing the system to maintain proper fluid distribution to all spray arms regardless of the upper rack's vertical position, while keeping each individual connection structure relatively simple.
Solution Approach 2:
The fluid distribution system is made dynamic through the rack-supported manifold that moves with the upper rack. The manifold includes multiple ports that can be alternatively accessed based on the rack's vertical position, enabling the system to adaptively maintain uniform fluid distribution to all spray arms as the rack is adjusted vertically.
2Ease of operation
If multiple fluid connections are provided for the intermediate spray arm to accommodate vertical rack adjustment, then uniform fluid distribution is achieved, but the device complexity increases
Solution Approach 1:
The rack-supported manifold serves multiple functions: it supports the intermediate spray arm, provides multiple fluid connection ports for different rack positions, and maintains fluid distribution uniformity across all spray arms. This multi-functional design consolidates what would otherwise require separate complex systems into a single integrated component.
3Productivity
If flow control system with separate conduits and valving is used, then flow timing to each spray arm is regulated, but the device complexity increases
Solution Approach 1:
The fluid control system merges multiple functions into a single rack-supported manifold that combines fluid distribution, flow timing control, and rack position adaptation. By integrating these functions into one system rather than using separate conduits and valving mechanisms, the patent achieves regulated flow timing to each spray arm while reducing overall device complexity.
Data Source
AI summary
A dishwasher includes a shiftable rack provided with multiple, distinct washing fluid spray arms connected to a common, rack supported manifold. When the rack is shifted to a retracted position within a tub of the dishwasher, the manifold mates with a coupling of a fluid distribution system including a multi-tube feed arrangement configured to selectively distribute washing fluid from a pump assembly to the multiple spray arms.