Dishwasher Spray Arm Guide Vanes for Coherent Wash Jets
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Solution Overview
Problem
Existing dishwasher spray arm designs face challenges in maintaining coherent washing liquid jets due to rotating movement, which can lead to inefficient cleaning and rinsing, and are difficult to manufacture with flow obstacles that can trap debris.
Innovation Solution
Incorporating guide vanes in the vicinity of the openings on the dishwasher spray arm to reduce the rotating movement of the washing liquid, allowing it to be dispensed as a coherent jet, with features such as radial extension and arrangement on the inner surface to prevent breakup and improve flow directionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flow obstacles are arranged on the opposite side of nozzles to create jet geometry, then the cleaning effect is improved, but the device complexity increases and debris entrapment occurs
Solution Approach 1:
The invention extracts and removes the flow obstacles from the spray arm structure, replacing them with guide vanes that achieve the same jet geometry control without creating debris entrapment zones. The guide vanes are positioned to redirect water flow smoothly without the complex obstacle arrangements of prior art.
Solution Approach 2:
The guide vanes act as an intermediary element between the nozzle and the surrounding environment, controlling the water jet geometry through smooth redirection rather than through complex obstacle interactions. This intermediary structure simplifies the overall design while maintaining cleaning effectiveness.
2Area of stationary object
If spray arms rotate to reach all parts of racks, then washing coverage is improved, but washing liquid jets break up due to rotating movement
Solution Approach 1:
The guide vanes are positioned to preemptively counteract the rotating movement of washing liquid before it exits the nozzle. By redirecting the flow path within the spray arm, the guide vanes prevent the development of excessive rotation that would cause jet breakup, thereby maintaining jet coherence despite spray arm rotation for comprehensive coverage.
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 guide vanes significantly enhance the cleaning and rinsing effect by maintaining the coherence of the washing liquid jet, improving dirt removal efficiency and reducing the risk of debris entrapment, while allowing for efficient washing of dishes in all parts of the chamber.
Implementation Method 1
the one or more guide vanes being arranged to at least partly prevent a rotating movement of washing liquid dispensed via the at least one opening
Implementation Method 2
The spray arms are sometimes rotatably arranged inside the washing chamber, and they may be forced to rotate when the washing liquid is dispensed. The rotation may be caused by the pressure of the washing liquid.
Data Source
AI summary
A dishwasher with a dishwasher spray arm is provided. The dishwasher spray arm may include a washing liquid intake, an inner volume, and at least one opening arranged to dispense washing liquid from the inner volume to a washing chamber. The dishwasher spray arm may also include one or more guide vanes in a vicinity of the at least one opening. The one or more guide vanes may at least partly prevent a rotating movement of washing liquid dispensed via the at least one opening.