Laundry Drum Induction Heating with Lifter Overheating Prevention
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Solution Overview
Problem
Laundry treatment apparatuses face inefficiencies and safety concerns due to overheating issues with lifters in drum heating systems, particularly with induction heating methods that lack specific configurations for enhancing efficiency and safety.
Innovation Solution
A laundry treatment apparatus that controls the induction module output based on the sensed or estimated position of the lifter, reducing heat generation in the lifter area, and uniformly heating the drum to prevent overheating and enhance stability, while maintaining the conventional drum and lifter shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If induction heating is applied to heat the drum, then heating efficiency is improved, but the lifter may overheat due to direct exposure to the induction module
Solution Approach 1:
The patent applies dynamics by making the induction module's operation conditional on the lifter's position. The control unit dynamically adjusts the induction module's activation state based on real-time detection of lifter position, turning the heating process from static to adaptive. This resolves the contradiction by enabling high heating efficiency when the lifter is absent while preventing overheating when the lifter is present in the heating zone.
Solution Approach 2:
The patent implements feedback through a detection unit that continuously monitors the lifter's position and provides this information to the control unit. The control unit then adjusts the induction module's operation based on this feedback. This closed-loop feedback mechanism allows the system to maintain high heating efficiency while automatically preventing lifter overheating by modulating the induction heating based on actual conditions.
2Speed
If the induction module operates continuously, then heating speed is improved, but energy is wasted heating the lifter area
Solution Approach 1:
The patent applies partial action by activating the induction module only when and where needed - specifically, only when no lifter is present in the heating area. Instead of continuous operation, the system performs heating action partially and selectively based on detection unit feedback. This prevents energy waste on the lifter while maintaining heating speed by ensuring the module operates at full capacity during effective heating periods.
Solution Approach 2:
The patent implements periodic action through intermittent operation of the induction module. The module alternates between active heating states and inactive states based on the periodic detection of lifter position. This periodic on-off operation pattern prevents continuous energy waste while maintaining overall heating speed by ensuring heating occurs during all viable periods when the heating zone is clear of lifters.
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 solution effectively prevents lifter overheating, reduces energy loss, and increases heating efficiency by varying the induction module output according to the lifter's position, ensuring safety and stability without altering the drum or lifter shapes.
Implementation Method 1
an induction module spaced apart from a circumferential surface of the drum and configured to heat the drum via a magnetic field generated when current is applied to a coil
Implementation Method 2
heating the drum... uniformly heating the drum to prevent overheating
Data Source
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AI summary
Disclosed is a laundry treatment apparatus including a drum formed of a metal material and provided to accommodate laundry therein, an induction module spaced apart from a circumferential surface of the drum and provided to heat the circumferential surface of the drum via a magnetic field that is generated when current is applied to a coil, and a lifter formed of a metal material and provided in the drum to move the laundry inside the drum when the drum rotates. The lifter is provided so as to be recessed in a direction in which a distance between the induction module and the lifter, which face each other, increases.