Dryer Drum Motion Control to Prevent Laundry Shrinkage
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Solution Overview
Problem
Existing laundry treating apparatuses face challenges in preventing damage, shrinkage, and over-drying of laundry during the drying cycle due to limitations in controlling drum rotation speed and direction, leading to wear, fluff generation, and deformation.
Innovation Solution
The apparatus varies drum rotation speed and direction throughout the drying cycle, employing optimized motion combinations and temperature control to prevent damage and shrinkage, using a direct drive system to connect the motor to the drum for precise control and reducing mechanical stress on the laundry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a belt and pulley system is used to rotate the drum, then the motor can be positioned at the bottom of the cabinet, but the drum rotation speed and direction cannot be rapidly changed due to belt slippage
Solution Approach 1:
The patent removes the belt and pulley components from the system, eliminating the source of slippage. The motor is repositioned to directly drive the drum through a direct connection, extracting the problematic intermediate transmission elements while maintaining the bottom-mounted motor configuration.
Solution Approach 2:
The patent introduces a direct drive connection as an intermediary between the motor and drum, replacing the belt-pulley system. This direct mechanical coupling serves as a new mediator that eliminates slippage while allowing rapid changes in drum rotation speed and direction.
2Productivity
If the drum rotates at high speed to improve drying efficiency, then drying time is reduced, but the laundry may be over-dried and damaged by hot air
Solution Approach 1:
The patent implements dynamic control of drum rotation speed, allowing the system to vary speed based on drying stage and laundry condition. The drum can rotate at higher speeds during early drying phases for efficiency, then reduce speed as laundry approaches optimal dryness, preventing over-drying damage while maintaining high productivity.
Solution Approach 2:
The patent employs periodic changes in drum rotation speed and direction, alternating between high-speed rotation for efficient drying and lower-speed or reverse rotation to redistribute laundry and expose different surfaces to hot air. This periodic action prevents localized over-drying while maintaining overall drying 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 approach effectively prevents damage, shrinkage, and over-drying by ensuring even drying and minimizing mechanical stress on the laundry, while maintaining a temperature that protects the fabric without causing damage.
Implementation Method 1
a heat pump 6 accommodated in the circulation flow channel 5 to condense air and re-heat air
Implementation Method 2
a motor 500 that provides the rotational power
Implementation Method 3
a reducer 600 that reduces the rotational force of the motor 500 and transmits the reduced rotational force to the drum 200
Data Source
AI summary
The present disclosure relates to a clothing processing apparatus that provides various optimized drum motion combinations capable of preventing damage to or shrinkage of laundry in a preheating period, a constant-rate drying period, a falling-rate drying period, and a cooling period, respectively.