Dryer Drum Reverse Rotation Control for Dust and Mite Separation
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Solution Overview
Problem
Existing dryers fail to effectively remove dust and mites from bedclothes when they are adhered to the inner circumference of the drum, as the rotation direction and speed do not facilitate sufficient separation and discharge of foreign materials.
Innovation Solution
A method that alternates the rotation direction and speed of the drying drum between clockwise and counterclockwise, utilizing a first set speed for initial dust separation and a second set speed for discharge, with the drying fan generating a forced air flow to separate and discharge dust without initial hot air supply, and later supplying hot air for bedclothes heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drum rotates in one direction with bedclothes adhered to the inner circumference surface, then the drum can maintain stable rotation, but foreign materials cannot be effectively separated from the bedclothes
Solution Approach 1:
The patent applies reverse rotation to separate foreign materials from bedclothes. The drum rotates in a first direction to adhere bedclothes to the inner circumference surface, then rotates in a second opposite direction to separate foreign materials. This inversion of rotation direction enables effective dusting off while maintaining stable rotation during each phase.
2Object-generated harmful factors
If hot air is supplied continuously during dusting, then dust separation may be improved, but power consumption increases significantly
Solution Approach 1:
The patent performs preliminary dusting off action before hot air supply. The drum rotates in the second direction to separate foreign materials from bedclothes first, and only after dusting is completed does the system supply hot air. This preliminary mechanical separation reduces or eliminates the need for continuous hot air supply during dusting, significantly reducing power consumption.
Solution Approach 2:
The patent maintains continuous useful action by rotating the drum throughout the entire process. The drum rotates in the first direction to adhere bedclothes, then continues rotating in the second direction to separate foreign materials, and finally rotates again to discharge dust. This continuous rotation ensures that the dusting function is performed effectively without interruption, while hot air is supplied only when necessary for heating.
3Productivity
If the drum rotates at high speed continuously, then dust discharge may be improved, but bedclothes cannot be properly adhered to the drum surface
Solution Approach 1:
The patent dynamically adjusts drum rotation speed and direction based on the operational phase. During the adhesion phase, the drum rotates in the first direction at a speed that allows bedclothes to adhere to the inner circumference surface. During the separation phase, it rotates in the second direction to separate foreign materials. During dust discharge, it rotates again to discharge accumulated dust. This dynamic adjustment of rotation characteristics optimizes both adhesion and dust discharge efficiency.
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 method ensures thorough dusting of bedclothes by alternating rotation speeds and directions, minimizing power consumption and providing a warm, soft feeling to the bedclothes by controlled hot air supply, effectively separating foreign materials like mites and dust.
Implementation Method 1
when the drying drum rotates in the first direction, the separated dust is discharged to the outside of the drying drum by a forced air flow generated by the drying fan
Implementation Method 2
rotating a drying drum at a first rotational speed V1 in a first direction for a first set time; rotating the drying drum at a second rotational speed V2 in a second direction opposite to the first direction
Data Source
AI summary
A method for controlling a dryer according to an embodiment of the present invention includes: an operation of, when a dusting mode is selected and a start command is input, rotating a drying drum at a first rotational speed V1 in a first direction for a first set time; an operation of, after the first set time elapses, rotating the drying drum at a second rotational speed V2 in a second direction opposite to the first direction for a first set time; and an operation of rotating a drying fan along with the drying drum, when the drying drum rotates in the second direction, dust staining on an object introduced into the drying drum is separated from the object, and when the drying drum rotates in the first direction, the separated dust is discharged to the outside of the drying drum by a forced air flow generated by the drying fan.