Dishwasher Cam-Based Position Sensor for Discrete Spray Arm Control
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Solution Overview
Problem
Traditional dishwasher spray arm systems are inefficient as they waste resources by evenly distributing wash fluid across all areas, leading to inadequate cleaning in corners and unnecessary noise, and lack precision in directing fluid where needed.
Innovation Solution
A cam-based position sensor is used to control a discretely directable tubular spray element, allowing it to rotate to specific positions within the wash tub, optimizing fluid distribution and reducing noise by focusing wash fluid on needed areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If spray arms rotate continuously to distribute wash fluid evenly across all areas, then all areas receive wash fluid coverage, but resources (time, energy, water) are wasted and cleaning precision is reduced
Solution Approach 1:
The spray system transitions from continuous rotation to dynamic discrete positioning. The tubular spray element can rotate to specific angular positions and remain stationary to deliver focused spray bursts, enabling precise fluid application only where needed during specific time intervals, thereby eliminating water waste while maintaining comprehensive coverage
Solution Approach 2:
The spray element operates in periodic cycles, rotating to predetermined angular positions and delivering spray bursts at specific intervals. This periodic operation allows the system to focus wash fluid on different zones sequentially, ensuring all areas receive adequate coverage while minimizing overall water consumption and energy usage
2Manufacturing precision
If spray arms follow a circular path to cover all areas, then broad coverage is achieved, but corner areas receive insufficient washing
Solution Approach 1:
The system implements localized spray delivery by positioning the tubular spray element at specific angular locations tailored to target difficult-to-reach areas such as corners. Each angular position is optimized to deliver concentrated spray coverage to specific zones, ensuring high cleaning precision in corner areas while maintaining overall tub coverage through sequential positioning
3Object-affected harmful factors
If spray jets are directed to sides of wash tub during rotation, then continuous spray coverage is maintained, but unnecessary noise is generated
Solution Approach 1:
The spray system operates periodically by activating spray bursts only when the tubular spray element is positioned at optimal angles away from tub sides. This timing-based control eliminates noise-generating spray contact with tub walls while maintaining wash cycle efficiency through concentrated, targeted spray delivery at productive moments
4Extent of automation
If traditional spray arms are used with simple rotation mechanism, then device complexity is low, but position sensing and discrete direction control are not achieved
Solution Approach 1:
The system replaces complex mechanical position sensing mechanisms with a cam-based sensor system. The cam profile mechanically translates rotational position into detectable sensor signals, enabling precise discrete angular position detection and control while keeping the overall device complexity manageable through elegant mechanical-to-electrical transduction
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 solution enhances cleaning efficiency by ensuring precise fluid distribution, improving wash performance, and reducing noise by allowing the tubular spray element to rotate to targeted positions within the wash tub.
Implementation Method 1
the cam-based position sensor including one or more cam detectors and a plurality of cam lobes operably coupled to the tubular spray element to rotate therewith
Data Source
AI summary
A dishwasher and method utilize a cam-based position sensor that is configured to sense multiple rotational positions for a discretely directable tubular spray element driven by a tubular spray element drive.