Dual-Drum Washing Machine with Nested Sub-Drum for 3D Laundry Movement
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Solution Overview
Problem
Conventional drum-type washing machines are limited by a single drum configuration, restricting laundry movement to 2D and resulting in reduced washing effectiveness, increased washing time, and higher power consumption.
Innovation Solution
A dual-drum washing machine design featuring a main drum and a sub drum that can rotate independently, with a dual-rotor driving motor and spiders connecting the drums, allowing for 3D laundry movement and enhanced roundness and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single drum configuration is used, then the device complexity is reduced, but the laundry movement is restricted to 2D resulting in reduced washing effectiveness
Solution Approach 1:
The sub drum is nested inside the main drum, with the sub drum rotating on an inner shaft while the main drum rotates on an outer shaft. This nested configuration enables 3D laundry movement without significantly increasing overall device complexity, as the sub drum utilizes the internal space of the main drum structure.
Solution Approach 2:
The washing drum is segmented into two independent rotating components: the main drum and the sub drum. Each drum can rotate independently on separate shafts, creating multiple movement dimensions for laundry while maintaining modular construction that doesn't excessively complicate the overall device.
2Reliability
If the sub drum and sub drum spider are integrated as a single member, then roundness and durability are enhanced, but the inner capacity of the sub drum is reduced
Solution Approach 1:
The sub drum is divided into two separate components: the sub drum body and the sub drum spider. The spider is formed independently and then coupled to the sub drum back, allowing the sub drum back to be processed separately for optimal inner capacity while the spider provides the necessary structural support and coupling function.
Solution Approach 2:
The sub drum spider acts as an intermediary component between the inner shaft and the sub drum back. This separate spider component enables the sub drum back to be optimized for capacity while the spider provides the mechanical coupling and support, resolving the conflict between structural integrity and internal volume.
3Productivity
If a dual-drum configuration is implemented, then washing effectiveness is enhanced through 3D laundry movement, but the device complexity increases
Solution Approach 1:
The dual-drum system is arranged in a nested configuration where the sub drum and its shaft are positioned inside the main drum structure. This nesting enables 3D laundry movement through independent rotation of both drums while minimizing the overall space requirement and reducing the apparent device complexity compared to a side-by-side dual drum arrangement.
Solution Approach 2:
The dual-drum system with independent shafts provides multi-functional movement capabilities: the main drum provides primary rotation for washing, while the sub drum provides secondary rotation for enhanced 3D movement. This multi-functionality achieves superior washing effectiveness while the shared space utilization keeps the device complexity manageable.
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 dual-drum configuration enhances washing effectiveness by enabling 3D laundry movement, reducing material costs, and improving the assembly process, while facilitating the processing of dehydration holes and patterns.
Implementation Method 1
a driving motor which drives the main drum and the sub drum independently from each other
Implementation Method 2
Laundry moves along the inner circumferential surface of the drum by a centrifugal force due to rotation of the drum
Implementation Method 3
by friction with the inner circumferential surface of the drum
Implementation Method 4
the laundry may perform a falling motion from an upper side of the drum by gravity
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Disclosed are a washing machine having a dual-drum of a main drum and a sub drum, and an assembly method thereof. The washing machine comprises: a cabinet; a tub provided in the cabinet; a main drum rotatably mounted in the tub; a sub drum mounted in the main drum so as to perform a relative rotation with the main drum; a hollow type outer shaft connected to the main drum; an inner shaft connected to the sub drum in the outer shaft; and a driving motor, wherein the driving motor comprises: a stator; an outer rotor connected to the inner shaft, and rotated outside the stator; and an inner rotor connected to the outer shaft, and rotated inside the stator, and wherein the driving motor drives the main drum and the sub drum in an independent manner.