Dryer control method
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Solution Overview
Problem
Conventional dryers face inefficiencies in heat exchange between drying target objects and air, particularly when the amount or volume of objects is large, leading to uneven drying due to limited movement of bulky items within the drum.
Innovation Solution
A method for controlling a dryer that involves a sequence of rotational motions and air supply operations to enhance heat exchange efficiency, including a first motion to rotate objects below a horizontal line, a second motion to move objects from upper to lower regions, and a third motion to keep objects in close contact with the drum surface, along with a second stirring operation that sequentially executes these motions to ensure comprehensive drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drum rotates at high speed to improve heat exchange efficiency, then drying efficiency improves, but bulky objects cannot move properly leading to uneven drying
Solution Approach 1:
The drum rotation speed is dynamically adjusted during the drying process. The control unit changes the rotation speed from a first speed to a second speed (and vice versa) multiple times during operation, allowing the system to adapt to different drying stages and object characteristics, thereby improving both drying efficiency and uniformity
Solution Approach 2:
The drum executes periodic stirring operations where it rotates at different speeds in a cyclic manner. The control unit causes the drum to rotate at a first rotation speed, then a second rotation speed, and repeats this pattern, creating periodic motion that enhances heat exchange while ensuring uniform drying of bulky objects
2Manufacturing precision
If the drum rotates slowly to allow object movement, then drying uniformity improves, but heat exchange efficiency decreases
Solution Approach 1:
The system dynamically adjusts rotation speed between a first speed (slower) and a second speed (faster) during the drying process. During phases requiring uniformity, the drum rotates at the first speed to allow object movement, while during phases requiring efficiency, it switches to the second speed for intense heat exchange
Solution Approach 2:
The drum performs periodic stirring by alternating between first and second rotation speeds. This periodic variation in rotation speed ensures that objects are periodically repositioned for uniform drying while also experiencing high-speed rotation for efficient heat exchange, resolving the contradiction between the two requirements
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 increases heat exchange efficiency between drying target objects and air, ensuring thorough drying irrespective of object size or volume, by optimizing drum rotation speeds and stirring sequences, thereby reducing drying time and improving drying uniformity.
Implementation Method 1
The second motion may rotate the drum at a rotational speed causing the drying target object located in a lower region below the horizontal line passing through the center of rotation of the drum to fall from an upper region above the horizontal line to the lower region
Implementation Method 2
an air supplier configured to supply air to the drum to remove moisture from the drying target object
Implementation Method 3
a dryer which supplies heated air (hot air) to a drum in which the drying target object is accommodated
Data Source
AI summary
The present invention relates to a dryer control method comprising: an air supply step for supplying air to a drum via an air supply unit; a first agitation step for controlling a drive unit so that the drum carries out a second motion and a third motion from when the air supply step begins until a preset reference time is reached; and a second agitation step for controlling the drive unit so that the drum carries out a first motion, the second motion and the third motion from when the reference time is reached until the completion of the air supply step.