Fluff Filter Electrode Layout for Reliable Dryer Moisture Sensing
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Solution Overview
Problem
Existing laundry drying devices face challenges in reliable moisture sensing and optimal operation, particularly in ensuring proper contact between laundry items and electrodes for conductivity measurements, and in detecting the presence of a fluff filter to prevent airway contamination.
Innovation Solution
A laundry drying device with a rotatably mounted drum and a measuring device featuring electrodes, where one electrode is attached to the fluff filter and the other to a housing part, allowing for improved contact and detection of the fluff filter's presence, ensuring accurate conductivity measurements and preventing airway contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrodes are arranged on the lint screen and removed with it, then the lint screen can be easily cleaned and replaced, but moisture sensing becomes unreliable when the lint screen is removed
Solution Approach 1:
The patent divides the electrode system into two separate electrodes: one integrated with the lint screen (first electrode) and one integrated with the housing (second electrode). This segmentation allows the lint screen to be independently removed for cleaning while the housing-mounted electrode remains in place, ensuring continuous moisture sensing capability.
2Reliability
If electrodes are attached to the drum air outlet grille, then moisture sensing is maintained during operation, but the drum structure becomes more complex and harder to clean
Solution Approach 1:
The patent extracts the moisture sensing function from the drum structure by placing one electrode on the housing instead of the drum. This separation simplifies the drum structure, making it easier to clean and maintain, while still enabling reliable moisture sensing through the combination of the lint screen-mounted and housing-mounted electrodes.
3Productivity
If the lint filter is missing and not detected, then the drying program continues, but lint contaminates the airways and damages the appliance
Solution Approach 1:
The patent implements preliminary detection of the lint filter's presence by using the first electrode (attached to the lint screen) as a sensor. Before the drying program begins, the system checks whether the lint screen is properly installed by detecting the electrical connection through this electrode. If the lint screen is missing, the program is aborted, preventing lint contamination of the airways.
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 enhances the reliability of moisture sensing, optimizes the drying process, and promptly alerts the user to a missing fluff filter, preventing contamination and extending the dryer's lifespan.
Implementation Method 1
a measuring device for measuring the conductivity of the laundry items is provided, comprising electrodes that can be brought into contact with the laundry items during a drying program for conductivity measurement
Implementation Method 2
a screen carrier covered with a fine-mesh screen material and a head with perforations through which process air from the interior can enter the screen housing
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a laundry drying appliance 1, in particular a tumble dryer 1, comprising a rotatably mounted drum 6, into the interior of which items of laundry can be placed and through which process air can be passed as part of a drying program for the items of laundry and then routed via a fluff filter 11. A measuring device 12 for measuring the conductance of the items of laundry is provided, which comprises electrodes 13, 14 which can be brought into contact with the items of laundry during the drying program for measuring the conductance. In order to create a laundry drying device in which reliable moisture sensing is possible, but at the same time optimal operation can be realized, the fluff filter 11 carries a first electrode 13 of the measuring device 12. The invention also relates to a fluff filter 11 for a laundry drying device 1, as well as a method for operating a laundry drying device 1.