Laundry Drawer Position Detection Using Magnetic Proximity Sensing
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Solution Overview
Problem
Laundry appliances face inefficiencies and faults due to the inability to detect the position of the drawer, leading to incorrect washing cycles, improper dispensing of laundry treatment agents, and potential contamination.
Innovation Solution
A drawer position detecting system using a target element and a sensor element, such as a magnet and magnetic sensor, to differentiate between the retracted and extracted positions of the drawer, preventing incorrect washing cycles and ensuring proper operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the laundry appliance operates without a drawer position detecting system, then the device complexity is reduced, but the reliability of washing cycle operation deteriorates due to inability to detect drawer position
Solution Approach 1:
The patent replaces complex mechanical position detection mechanisms with a magnetic field-based detection system. A magnet is attached to the drawer and a magnetic sensor on the cabinet body detects the magnet's position, eliminating the need for mechanical switches, encoders, or complex linkages while achieving reliable position detection.
Solution Approach 2:
The patent changes the detection parameter from mechanical contact or optical reflection to magnetic field strength. By detecting changes in magnetic field parameters (presence, position, or strength of the magnet), the system reliably determines drawer position without adding mechanical complexity.
2Loss of information
If the drawer position is not detected, then the device complexity is reduced, but the loss of information increases due to lack of drawer position data
Solution Approach 1:
The patent uses a magnetic field-based detection system instead of mechanical sensors to obtain drawer position information. The magnet attached to the drawer creates a detectable magnetic field that provides continuous position information without requiring mechanical contact or complex sensing mechanisms.
Solution Approach 2:
The drawer itself provides the detection signal through the magnet attached to it. The magnet serves as both a functional component of the drawer and the detection target, eliminating the need for separate sensing mechanisms on the drawer while providing continuous position information.
3Productivity
If the drawer position detecting system is implemented, then the productivity of washing cycles is improved by preventing incorrect operations, but the device complexity increases due to additional components
Solution Approach 1:
The patent replaces potential mechanical detection systems with a magnetic field-based approach using a simple magnet and magnetic sensor. This substitution maintains washing cycle productivity by enabling reliable position detection while minimizing added complexity through the use of passive magnetic components rather than active mechanical systems.
4Measurement precision
If a complex drawer position detection system is used, then the measurement precision of drawer position is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The patent uses a magnet attached to the drawer and a magnetic sensor on the cabinet, replacing complex mechanical or optical detection systems. This approach achieves sufficient measurement precision for drawer position detection while greatly simplifying manufacturing, as magnets and magnetic sensors are easy to install and require minimal calibration or alignment.
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 system efficiently detects the drawer position, preventing faults and contamination by ensuring that washing cycles are only initiated when the drawer is in the correct position, enhancing the appliance's operational efficiency and user safety.
Implementation Method 1
a sensor element (320), such as a magnetic sensor, configured to sense a proximity of a target element (310), such as a magnet, to the sensor element (320)
Data Source
AI summary
A laundry appliance having a cabinet accommodating a laundry treatment chamber, a storage drawer comprising at least one compartment for containing laundry treatment agent and a drawer seat slidingly housing the storage drawer such that the storage drawer is slidable between a retracted position, in which the storage drawer is retracted inside the drawer seat, and an extracted position, in which the storage drawer is at least partially extracted from the drawer seat. The laundry appliance further comprises a drawer position detecting system for detecting when the drawer is in the retracted position. The drawer position detecting system comprises a target element on one of the cabinet and the drawer, and a sensor element on the other of the cabinet and the drawer. The detecting system is configured to sense a proximity of the target element to the sensor element.