Drum-type washing machine

Abstract

A washing machine according to the present invention comprises: a drum (3) which is rotatably supported by a rotation axle (3a) which is horizontal or oblique; a drive motor (12) which rotationally drives the drum (3); a water tank (2) which houses the drum (3); and a first balancer (8A) which is disposed at the front end part of the drum (3) and / or a second balancer (8B) which is disposed at the rear end part of the drum (3). The first balancer (8A) and the second balancer (8B) are configured of a ring-shaped container (11) which houses a moving body which includes a turning body (19) and / or a viscous fluid (10). When starting the rotation of the drum in a spin step, a control unit increases the RPMs of the drum to prescribed RPMs greater than or equal to the resonance RPMs of the water tank, and after sustaining the prescribed RPMs for a prescribed time, increases the RPMs of the drum to steady RPMs of the spin step.

Description

technical field [0001] The invention relates to a drum type washing machine which performs washing, rinsing and dehydration of laundry in a drum having a horizontal or inclined rotating shaft. Background technique [0002] In a drum-type washing machine having a horizontal or inclined rotation shaft, laundry may be out of balance in the drum during the spin-drying process. When the spin-drying process is performed in an unbalanced state, a biased force is applied to the rotating shaft of the drum to generate vibration. The amplitude of the vibration increases in proportion to the square of the rotational speed of the drum. When the drum vibrates, the main body of the washing machine moves, or the noise is intense, and therefore there are problems such as being unable to operate at a predetermined rotational speed or higher. [0003] In order to solve these problems by reducing the vibration caused by the unbalance of the laundry, it is known to provide a balancer device fo...

AI Technical Summary

Problems solved by technology

[0011] And, when the rotational speed of the drum exceeds the resonance rotational speed, the moving body moves in the direction of the 180-degree phase that cancels the imbalance. The situation of the location

If the resonance speed is exceeded and then the state is maintained and the speed is suddenly increased, the moving body cannot move to the position of the 180-degree phase that cancels out of balance due to the centrifugal force.

In this case, there is a problem that the vibration at a stable rotational speed is not sufficiently reduced

In addition, when the viscosity of the viscous fluid is high, there is a problem that the movement of the mobile body is slow and the vibration is enlarged when the resonance speed is exceeded.

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