Drum washing machine

Abstract

A drum washing machine provided with a dynamic absorber capable of reducing the vibration of a low frequency band, the drum washing machine including a body, a drum rotatably installed at an inside the body, a tub installed to vibrate while surrounding the drum, and a dynamic absorber installed at the tub to directly reduce vibration delivered to the tub, wherein the dynamic absorber includes a mass body and an elastic member configured to elastically support the mass body for the mass body to move toward a direction of the vibration of the tub to reduce the vibration of the tub.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority benefit of Korean Patent Application No. 10-2011-0117287, filed on Nov. 11, 2011 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.BACKGROUND[0002]1. Field[0003]The following description relates to a drum washing machine having a dynamic absorber capable of reducing vibration thereof.[0004]2. Description of the Related Art[0005]A drum washing machine is an apparatus capable of washing a laundry using electricity, and generally includes a tub configured to store washing water therein, a drum rotatably installed at an inside the tub and configured to accommodate laundry at an inside thereof, and a driving apparatus configured to drive the rotation of the drum, and the laundry is performed by the rotation of the drum by the driving apparatus.[0006]However, the force generated during the rotation of the drum is delivered to the tub surrounding the drum,...

AI Technical Summary

Benefits of technology

The present invention provides a drum washing machine with a dynamic absorber that can reduce vibration in the low-frequency band. This results in a reduction of the gap between the frame and tub, which increases the washing capacity of the machine.

Problems solved by technology

However, the force generated during the rotation of the drum is delivered to the tub surrounding the drum, thereby generating vibration.

However, in a case when a ball is positioned in the same direction as the laundry at the uneven state during a transient state, that is, a range prior to the natural frequency of a system, the ball may cause the imbalance, resulting in increased vibration.

However, the natural frequency of the dynamic absorber is to reduce the vibration of a high frequency band, and thereby the vibration of a low frequency band may not be reduced.

In addition, in a case of a large-capacity drum washing machine, as the length of the tub is increased along with the increase of the capacity of the drum, the horizontal vibration of the rear surface of the tub is intensified during a resonance period at an initial stage of a spin-dry process, and thus, the horizontal vibration of the tub may result in a collision with the body of a drum washing machine.

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