Domestic dishwasher having a spray device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing household dishwashers face issues with jamming and blocking of spray devices due to dirt particles, which can hinder effective cleaning, especially for heavily soiled items.
Innovation Solution
A spray device with a rotary element mounted in a cage, featuring a radially distanced bearing surface and multiple bearing portions with intermediate spaces to prevent jamming, combined with a conical hub and rotor blades for efficient water distribution, creating a hemispherical spray pattern for enhanced cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotary element is centrally mounted on the axis of rotation, then the structure is compact and simple, but blocking or jamming occurs due to dirt particles
Solution Approach 1:
The rotary element is mounted eccentrically on the bearing surface, which is radially distanced from the axis of rotation. This asymmetric mounting creates large bearing clearances in both axial and radial directions, preventing dirt particles from blocking the rotary element while maintaining a compact overall structure.
Solution Approach 2:
The bearing surface is positioned in a radial direction away from the axis of rotation, transitioning the mounting location from the central axis to a radial offset position. This dimensional change enables simultaneous achievement of large bearing clearance and compact structure.
2Reliability
If the bearing clearance is reduced for compact design, then the structure is more compact, but blocking by dirt particles occurs
Solution Approach 1:
The eccentric mounting of the rotary element on the radially distanced bearing surface creates asymmetric bearing clearances that are large in both axial and radial directions. This asymmetric design prevents dirt particle blocking while maintaining a compact overall device volume.
Solution Approach 2:
The large bearing clearances are pre-established through the eccentric mounting design before operation begins. This preliminary structural arrangement ensures that dirt particles cannot block the rotary element during operation, preventing future jamming issues.
3Productivity
If the spray device is designed for intensive washing of heavily soiled items, then cleaning performance improves, but the device becomes more complex
Solution Approach 1:
The eccentric mounting of the rotary element creates a dynamic spray pattern that enhances cleaning effectiveness for heavily soiled items. The asymmetric position allows the rotary element to effectively distribute washing liquor while preventing blocking, achieving intensive washing without excessive structural complexity.
Solution Approach 2:
The large bearing clearances created by the eccentric mounting enable the spray device to handle heavily soiled items and dirt particles without blocking. The design allows the device to effectively clean difficult-to-clean items while the bearing structure itself resists blocking by the same dirt particles.
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 design ensures reliable operation by preventing jamming, improving cleaning performance for difficult-to-clean items with a freely definable spray pattern and minimal dead regions, while maintaining a compact and resistant structure.
Implementation Method 1
a rotary element (18) that is mounted in said cage so as to rotate about an axis of rotation
Data Source
AI summary
A household dishwasher includes a washing compartment and a spray device arranged inside the washing compartment and configured to spray washing liquor and/or clean water within the washing container. The spray device includes a cage and a rotary element which is mounted in the cage for rotation about an axis of rotation. The rotary element includes a bearing surface which is radially distanced from the axis of rotation and extending around the axis of rotation for enabling the rotary element to be mounted rotatably in the cage.