Dishwashing appliances and pump assemblies
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Solution Overview
Problem
Existing dishwashing appliances face challenges in guiding fluid through pump housings without significant pressure variations, leading to inefficiencies and difficulties in assembling and sealing features that maintain fluid flow paths.
Innovation Solution
A dishwashing appliance design featuring a tub, sump, chamber pump, and threaded engagement joint with a vane and foil profile, where the vane is positioned within the chamber pump housing and secured with a complementary radial thread profile, directing fluid flow while preventing pressure leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluid channels or vanes are added to create a predefined path to gradually redirect fluid flow and mitigate pressure variations, then fluid flow control is improved, but device complexity and difficulty of assembly increase
Solution Approach 1:
The pump housing is divided into multiple segments or sections, each with integrated fluid channels. This segmentation allows for modular assembly while maintaining predefined fluid paths, reducing the complexity of assembling complex fluid redirection features into a single monolithic housing.
Solution Approach 2:
Fluid channels and vanes are integrated directly into the pump housing structure rather than being separate components. This merging of functions reduces the number of parts and assembly steps while maintaining the predefined fluid path necessary for reliable flow control.
2Reliability
If features such as fluid channels or vanes are incorporated to redirect fluid flow, then fluid flow control is improved, but sealing difficulty increases
Solution Approach 1:
Sealing features are integrated into the pump housing and fluid channel structures during manufacturing. This merging ensures that sealing surfaces are precisely formed as part of the housing itself, eliminating the need for separate sealing components and reducing assembly complexity.
Solution Approach 2:
Flexible sealing elements or gaskets are used at critical interfaces within the pump housing to ensure reliable sealing of fluid channels. These flexible elements can accommodate manufacturing tolerances and provide effective sealing without requiring extremely precise manufacturing.
3Device complexity
If existing pump configurations are used without predefined fluid paths, then device complexity is reduced, but pressure variations and fluid flow efficiency deteriorate
Solution Approach 1:
The pump housing incorporates localized fluid channels and vanes in specific regions where flow control is needed, rather than creating a completely complex predefined path throughout the entire housing. This local quality approach maintains pump efficiency by providing flow guidance only where necessary, balancing simplicity with performance.
Solution Approach 2:
The pump design incorporates adjustable or movable components that allow optimization of fluid flow paths based on operating conditions. This dynamic capability enables the pump to maintain high efficiency across varying flow rates and pressure conditions without requiring a completely complex fixed structure.
Data Source
AI summary
A dishwashing appliance is provided herein. The dishwashing appliance may include a tub, a sump, a chamber pump, a vane, and a threaded engagement joint. The chamber pump housing may be mounted within at least a portion of sump. The chamber pump housing may define an inner wall surface. The vane may be positioned within the chamber pump housing. The vane may extend from an inner radial end to an outer radial end. The vane may define a foil profile. The threaded engagement joint may include a first radial thread profile and a second radial thread profile. The first radial thread profile may extend radially from the vane at the outer radial end. The second radial thread profile may be formed on the inner wall surface. The second radial thread profile may be complementary to the first radial thread profile.