Domestic dishwasher
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Solution Overview
Problem
Existing household dishwashers face challenges in ensuring precise assembly and disassembly of the spray arm, which can lead to incorrect positioning and potential operational issues, often requiring additional sensors for angular position detection.
Innovation Solution
The implementation of a rib geometry with an encoding groove on the spray arm and a corresponding encoding rib on the pump pot allows for precise alignment during assembly and disassembly, eliminating the need for additional sensors by ensuring the spray arm can only be assembled in one angular position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sensors are added to detect the angular position of the spray arm, then the assembly precision can be improved, but the device complexity increases
Solution Approach 1:
The spray arm assembly structure itself provides the positioning function through the encoding groove and encoding rib mechanism, eliminating the need for external sensors. The structure serves both its primary function of water spraying and the secondary function of angular position detection and control
Solution Approach 2:
The encoding groove and encoding rib act as an intermediary mechanical interface between the spray arm and pump pot, providing precise angular position information without requiring electronic sensors. This mechanical intermediary translates angular position into a physical constraint
2Measurement precision
If additional sensors are installed for angular position detection, then the measurement precision improves, but the ease of operation deteriorates
Solution Approach 1:
The assembly structure automatically provides angular position guidance through its geometric features (encoding groove and encoding rib), making the assembly process self-guiding and intuitive without requiring users to interpret sensor data or follow complex alignment procedures
3Ease of operation
If the spray arm allows free assembly at any angular position, then the ease of operation improves, but the reliability deteriorates due to incorrect positioning
Solution Approach 1:
The encoding groove and encoding rib create an asymmetric geometric relationship that permits assembly in only one correct angular position. This asymmetric constraint ensures reliable positioning while maintaining ease of operation, as users can freely assemble the component knowing the geometry will guide it to the correct orientation
Data Source
AI summary
A household dishwasher includes a washing container receiving a dishwasher load, a pump pot, and a spray arm for applying washing liquor and/or fresh water to the dishwasher load in the washing container. The spray arm is actively driven by a drive system and mounted on the pump pot for rotation about an axis of rotation. The spray arm has a rib geometry that revolves around the axis of rotation and includes an encoding groove running along the axis of rotation. The pump pot includes an encoding rib running along the axis of rotation and corresponding to the encoding groove. The encoding rib is configured for passage through the encoding groove along the axis of rotation during assembly and disassembly of the spray arm so as to enable the spray arm to be assembled on and disassembled from the pump pot in precisely one angular position.