Dishwasher Satellite Wash Arm Nozzle Layout for Wider Coverage
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Solution Overview
Problem
Conventional dishwasher wash arm arrangements often fail to provide comprehensive coverage of the washing area, especially when limited by the number of nozzles on the satellite arm.
Innovation Solution
A wash arm arrangement featuring a central arm connected to a first shaft for liquid supply and a satellite arm connected to a second shaft, with strategically positioned nozzles, including an outer nozzle positioned at a specific radial distance from the central arm's axis of rotation to maximize coverage, and optionally skewed for enhanced cleaning and propulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of nozzles on the satellite arm is limited, then the device complexity is reduced, but the coverage of the washing area deteriorates
Solution Approach 1:
The patent positions the outer nozzle at an optimized radial distance from the central arm's axis of rotation, creating an extended coverage pattern that spans across the central axis. This dimensional optimization of nozzle placement allows a single nozzle to cover a larger area by leveraging the rotational motion and radial positioning, effectively compensating for the reduced number of nozzles while maintaining comprehensive washing area coverage.
2Stress or pressure
If liquid pressure is maintained high, then the cleaning effectiveness is improved, but the liquid usage increases
Solution Approach 1:
The patent optimizes the radial distance parameter of the outer nozzle from the central arm axis to achieve maximum coverage efficiency. By carefully selecting this geometric parameter, the system achieves comprehensive area coverage with high-pressure liquid application, ensuring that each unit of liquid traverses the maximum possible path length and covers the largest area, thereby reducing overall liquid consumption while maintaining high pressure for effective cleaning.
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 ensures high coverage and increased liquid jet density over the washing area, minimizing liquid usage while maintaining high pressure and flow for effective cleaning and soil removal.
Implementation Method 1
When the cleaning liquid is released a thrust is created moving both arms in circles around their individual axis of rotation
Implementation Method 2
The nozzles are arranged having different spray angles for covering the different areas of the washing area of the treatment chamber with cleaning liquid
Data Source
AI summary
A wash arm arrangement (20) for a dishwasher is disclosed which has a central arm (21) adapted to be rotatably connected with a first shaft (23) through which liquid under pressure is fed into said central arm during operation. A satellite arm (22) is rotatably connected with a second shaft (24) arranged on the central arm, and which is arranged separated a first radial distance rcs from the axis of rotation of the central arm. The second shaft supplies liquid to the satellite arm during operation. To provide the liquid to a washing area of the dishwasher, the satellite arm comprises at least one outer nozzle (25) for providing liquid to a washing area of the dishwasher. The centre of the outer nozzle is arranged at a second radial distance rn with respect to the axis of rotation for the satellite arm which is at least equal to the first radial distance rcs minus half the width of the nozzle in a radial direction, and at most equal to the first radial distance rcs plus half the width of the nozzle in a radial direction. Thereby, an alternative and improved wash arm arrangement which has a high coverage of the washing area is achieved.