Laundry treatment device
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Solution Overview
Problem
Existing washing machine dynamic absorbers fail to effectively absorb transient oscillations due to viscoelastic member deterioration, low attenuation ratio, and increased breakage risk, particularly when subjected to shear stress and bending, leading to inadequate absorption of horizontal oscillations.
Innovation Solution
A dynamic absorber design featuring a support plate with a partitioned top surface, where a first moving mass absorbs continuous oscillations and a second moving mass absorbs transient oscillations, with overlapping absorption regions to enhance oscillation displacement reduction, and elastic dampers to minimize frictional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a viscoelastic member is placed on the bottom surface of the moving mass to absorb oscillation, then the dynamic absorber can reduce oscillation displacement, but the continuous load causes breakage and deterioration of the viscoelastic member
Solution Approach 1:
The patent divides the moving mass into multiple separate masses (first moving mass and second moving mass) positioned at different locations. This segmentation distributes the load on the viscoelastic member, preventing concentration of stress at a single point and reducing deterioration while maintaining oscillation absorption effectiveness.
2Reliability
If the moving mass vibrates horizontally to absorb oscillation, then the dynamic absorber can counteract cabinet oscillation, but the attenuation ratio is low and transient oscillation is not effectively absorbed
Solution Approach 1:
The patent positions moving masses at specific locations (front and rear ends of the cabinet) rather than using a single central mass. This local placement optimizes the absorption of transient oscillations at different positions along the cabinet, improving the overall attenuation ratio and effectiveness.
3Device complexity
If the dynamic absorber uses a single moving mass structure, then the device complexity is low, but the ability to absorb both transient and continuous oscillation is insufficient
Solution Approach 1:
The patent designs the dynamic absorber with multiple moving masses that can simultaneously address different oscillation modes (transient and continuous). Each moving mass serves multiple functions: absorbing oscillations at different frequencies, distributing loads, and providing redundancy, thereby enhancing overall absorption capability without proportionally increasing complexity.
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 dynamic absorber effectively reduces oscillation displacement of both transient and continuous oscillations, improving absorption capability and extending the lifespan of the viscoelastic member by distributing load and stress more efficiently.
Implementation Method 1
The dynamic absorber is a dynamic absorber using the principle of absorbing the oscillation of the washing machine by vibrating in the horizontal direction in a phase opposite to the phase of the horizontal exciting force generated by the rotation of the drum by 180 degrees
Implementation Method 2
when the moving mass vibrates in a horizontal direction, the viscoelastic member absorbs the oscillation by using shear stress acting in the left and right direction
Implementation Method 3
elastic dampers to minimize frictional forces
Data Source
AI summary
A laundry treatment device according to an embodiment of the present invention includes: a cabinet; a drum accommodated in the cabinet; a tub configured to accommodate the drum; and a dynamic absorber provided to absorb oscillation of the cabinet, wherein the dynamic absorber includes: a support plate coupled to the cabinet; and a moving mass placed movably on the support plate to absorb oscillation transferred to the cabinet, and a partition wall configured to partition a top surface of the support plate, on which the moving mass is placed, into a first accommodation part and a second accommodation part protrudes from the top surface of the support plate.