Eccentric Dishwasher Spray Arm Layout for Full Basket Coverage
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Solution Overview
Problem
Dishwashers with rectangular washing containers of different widths and depths face challenges in achieving even cleaning and dissolving cleaning agents, as centrally mounted spray arms cannot effectively reach the front and rear walls, leaving unexposed areas and reducing the effectiveness of cleaning agents held on the front edge or door.
Innovation Solution
An eccentrically arranged spray arm offset from the central bearing, combined with an additional rear spray system in the same plane, ensures that cleaning agents on the front end can be directly acted upon by the spray arm's jet, while the rear system covers the entire surface of the washing basket, maintaining an even application without height restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a centrally mounted spray arm is used in a rectangular washing container with different width and depth, then the spray arm can be positioned at the center, but it cannot reach the front and rear walls effectively, leaving unexposed areas
Solution Approach 1:
The spray arm is positioned eccentrically (asymmetrically) relative to the center of the washing container, specifically offset toward the rear wall. This asymmetric positioning allows the spray arm to extend further toward the front wall while maintaining adequate coverage toward the rear, eliminating the unexposed areas that would result from a symmetric central mounting in a rectangular container with unequal dimensions.
2Device complexity
If a centrally mounted spray arm is used, then the structure is simple, but cleaning agents on the front edge or door cannot be effectively exposed to the spray jet
Solution Approach 1:
The eccentric positioning of the spray arm toward the rear wall creates an asymmetric spray pattern that directs the spray jet forward toward the front wall and door area. This ensures that cleaning agents placed on the front edge or door are effectively exposed to the spray, enabling proper dissolving and activation without increasing structural complexity.
3Ease of operation
If multiple spray arms are used to cover different areas, then coverage is improved, but device complexity and cost increase
Solution Approach 1:
Instead of using multiple spray arms in a symmetric arrangement, the invention employs a single spray arm positioned asymmetrically. This asymmetric single-spray-arm configuration achieves comprehensive coverage of the rectangular washing container by optimizing the position to maximize spray reach in all directions, thereby avoiding the increased complexity and cost associated with multiple spray arms while maintaining effective surface 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
This configuration allows for effective washing and dissolving of cleaning agents across the entire surface, ensuring that all areas are evenly wetted and cleaned, even in narrow installations, without compromising the loading height or increasing complexity and cost.
Implementation Method 1
Rotatable spray arm can be acted upon with water and/or so-called rinsing liquor, which can be dispensed by the spray arm with an upward component
Implementation Method 2
spray arm that can be rotated about a vertical central axis, so that the spray arm rotates during its rotation reaches equally close to the front and rear edges as well as to the two side edges
Data Source
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AI summary
A dishwasher (1), in particular a household dishwasher, with a washing tub (2) having at least an essentially rectangular plan with a front (V) facing a user in the operating position and which is provided with at least one washing basket (4;5) in which items to be cleaned can be held and which can be sprayed with water (FW) and/or so-called washing liquor (S) via a rotatable spray arm (6;7) assigned to the respective washing basket (4;5) is provided with at least one receiving container (27) for cleaning agents on its front (V) facing edge region or on a door (3) closing the wash tub (2) on its front (V), is designed such that at least one spray arm (7) is arranged eccentrically below the wash basket (5) along the transverse center (Q) of the dishwasher (1) in a position offset towards the front (V) such that a receiving container (27) for cleaning agents, in particular for cleaning agents in solid form, arranged at the front end of the wash basket (5) facing the door (3) or in the door (3), can be acted upon by a jet (29) of water (FW) and/or wash liquor (S) emerging from said spray arm (7), and that an additional spray system (8;9) is provided with one or more further outlet openings (13) for water (FW) and/or rinsing solution (S) at least nearly in the horizontal plane of the said spray arm (7).