JP2001276474A - Drum type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum type washing machine capable of effectively restraining vibration by use of a cylindrical hollow balancer having a liquid sealed therein. SOLUTION: The cylindrical hollow balancer 9 having the liquid sealed therein is installed to surround the outside of a drum 2. If eccentric load due to the localization of laundry is great, a rotating speed is controlled to decrease at the time when the position where the eccentric load is located reaches the upper point of rotation, so that the liquid in a room located at or near the position of the eccentric load flows out into another room located at or near an opposite position. The liquid in the room at the position where the eccentric load is located is decreased and moves into the other room in the opposite position to vary the weight balance of the liquid to thereby reduce the eccentric load of the entire drum 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type washing machine in which laundry is accommodated in a washing tub having a horizontal rotating shaft, and the laundry is washed by rotating the washing tub.

[0002]

2. Description of the Related Art An example of a conventional drum type washing machine will be described with reference to the drawings. As shown in FIG. 3, an outer tub (3) is arranged inside the housing (1), and the outer tub (3) is supported from the housing (1) by a spring (5) and a damper (6). A washing tub (2) is rotatably installed inside the outer tub (3). On the front of the outer tub (3), a lid (4) to be opened when putting laundry is installed.

The washing tub (2) is driven to rotate by a drive mechanism (7) attached to the outer tub (3). The driving mechanism (7) includes a motor (8) as a driving source, and a driving pulley (71) is attached to an output shaft (81).

Further, a main shaft (21) serving as a rotating shaft of the washing tub (2) protrudes from the back surface of the outer tub (3).
A driven pulley (73) is attached to the tip of the main shaft (21), and a belt (7) is provided between the driven pulley (73) and the driven pulley (71).
2) is stretched.

Accordingly, when the motor (8) is driven to rotate, the rotation is transmitted to the main shaft (21) via the driving pulley (71), the belt (72) and the driven pulley (73).

In the above-mentioned drum type washing machine, the laundry and washing water are stored in the washing tub (2), and the laundry is washed by rotating the washing tub (2) at a low speed. After draining, the washing tub (2) is rotated at high speed to dehydrate the laundry.

When the washing tub (2) rotates, the laundry rotates while being pressed against the inner peripheral wall of the washing tub (2). ), The outer tub (3) vibrates violently, and loud noise is generated from the floor on which the washing machine is installed. Therefore,
In the conventional drum type washing machine, the outer tub (3) is supported by a spring (5) and a damper (6), and is formed of an annular hollow body in which liquid is sealed in the rear or front of the washing tub (2). A balancer (9) is installed to suppress vibration.

FIG. 4 is a schematic diagram showing the state of the liquid in the rotating balancer (9). The balancer (9) is a liquid-filled annular hollow body provided at the rear or front part of the washing tub (2), and the inner peripheral side communicates with the inner peripheral side by a radially provided partition wall on the inner peripheral side. It is partitioned into a plurality of rooms (91). In the balancer (9), when rotating at high speed, the centrifugal force exceeds the gravity, so that the liquid is smoothed and held on the inner peripheral wall of the balancer (9) as shown in FIG. I have. Here, if the rotation speed is reduced at a timing corresponding to the position of the eccentric load, gravity is also acting on the liquid in the rotating balancer (9), and as shown in FIG. Rooms (91a), (91b), (9) being lifted above tank (2)
The liquid drops from 1c), and most of the dropped liquid flows into the room (91d) located on the opposite side. As a result, as shown in FIG. 4C, the rooms (91a), (91b), and (91) near the position where the eccentric load due to the uneven distribution of the laundry exists.
The liquid in c) almost disappears, and the liquid in the room (91d) located on the opposite side and the adjacent room increases. This reduces the eccentric load of the entire washing tub (2).

[0009]

However, in the above-mentioned conventional drum-type washing machine, as shown in FIG. 5, a balancer (9) formed of an annular hollow body filled with a liquid has a structure in which the balancer (9) is a washing machine. Since the tub (2) is installed at the rear or front part, the eccentric load due to the uneven distribution of the laundry will
As shown in (b), when it is located in a place away from the balancer (9) in the front-back direction, the effect cannot be expected. An object of the present invention is to effectively suppress vibration of a drum type washing machine regardless of an eccentric load due to uneven distribution of laundry at any position on a washing tub.

[0010]

A drum type washing machine according to the present invention is a drum type washing machine in which a rotatable washing tub is installed horizontally in an outer tub elastically supported by a housing. A balancer which is provided to surround and is a cylindrical hollow body in which a liquid is sealed therein, and is partitioned into a plurality of rooms in which the inner peripheral side communicates with a partition provided radially on the inner peripheral side, After rotating the washing tub at a predetermined rotation speed to substantially uniformly fill the plurality of rooms inside the balancer with the liquid, the rotation speed is temporarily reduced at a timing according to the position of the eccentric load, and Operation control means for moving the liquid from the room to the second room.

The balancer is a cylindrical hollow body surrounding the washing tub and filled with a liquid therein. The eccentric load due to uneven distribution of the laundry is located at any position in the front-rear direction on the inner peripheral wall of the washing tub. Even when the eccentric load exists, the balance adjustment can be achieved by reducing the liquid at the same position as or near the position of the eccentric load.

In the above configuration, the operation control means rotates the washing tub near a rotation speed at which the centrifugal force acting on the liquid in the balancer and the gravity are substantially balanced. Then, the liquid that has overflowed from a certain room in the balancer enters another room where the amount of liquid is small, and the same amount of liquid is finally held in each of the divided rooms. In this state, since the eccentric load by the balancer can be ignored, the eccentric load detecting means detects the magnitude and position of the eccentric load due to the uneven distribution of the laundry. When the eccentric load is large, the operation control means causes the liquid in the room located at or near the position of the detected eccentric load to flow out, and the liquid to flow into the room located at or near the opposing position. Then, an instruction is given to the rotation control means to temporarily reduce the rotation speed. Specifically, control is performed such that the rotation speed is reduced when the position where the eccentric load exists reaches the rotation upper position. The liquid in the room at the position where the eccentric load exists is reduced, and the weight balance of the liquid is changed by moving into the room located at or near the opposing position, whereby the eccentric load of the entire washing tub is reduced. Decrease.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The main configuration is the same as that of the drum type washing machine of the related art, and the description is omitted.

During the rotation of the washing tub (2), the laundry rotates while being pressed against the inner peripheral wall of the washing tub (2). ), The outer tub (3) vibrates violently, and loud noise is generated from the floor on which the washing machine is installed. here,
A balancer (9) composed of a cylindrical hollow body filled with a liquid is installed so as to be wrapped around the washing tub (2). As a result, even if there is an eccentric load due to the uneven distribution of the laundry at any position in the front-rear direction on the inner peripheral wall of the washing tub (2), the liquid at the same position as the eccentric load or a nearby position is reduced. This makes it possible to achieve balance adjustment.

The state of the liquid in the rotating balancer (9) of the present invention is the same as the state of the liquid in the rotating balancer (9) in the conventional drum type washing machine of FIG. The description is omitted.

The description of the above embodiments is for describing the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. Also, the configuration of each part of the present invention is not limited to the above-described embodiment,
It goes without saying that various modifications are possible within the technical scope described in the claims.

[0017]

As described above, according to the present invention,
Regardless of where the laundry is unevenly distributed on the inner peripheral wall of the washing tub, the balance adjustment can be achieved by reducing the liquid at the same position as or near the position of the eccentric load. Therefore, vibration can be suppressed in a short time with a simpler structure.

[Brief description of the drawings]

FIG. 1 is a cutaway side view of a drum type washing machine according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a state of vibration suppression by a balancer of the drum type washing machine according to the embodiment of the present invention.

FIG. 3 is a cutaway side view of a conventional drum-type washing machine.

FIG. 4 is a schematic diagram showing a state of a liquid in a balancer during a balance adjustment operation in a conventional drum-type washing machine.

FIG. 5 is a schematic view showing a state of vibration suppression by a balancer of a conventional drum type washing machine.

[Explanation of symbols]

 Reference Signs List 1 housing 2 washing tub 21 main shaft 3 outer tub 4 lid 5 spring 6 damper 7 drive mechanism 8 motor 9 balancer 91 liquid storage room

Continued on the front page (72) Inventor Komei Noguchi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3B155 AA06 BA04 BA16 CA02 CA16 CB06 DC03 DC09 DC10 DC21 KA01 KA33 KB27 LA03 LB18 LC07 MA01 MA02

Claims (1)

[Claims] 1. A drum type washing machine in which a rotatable washing tub is installed horizontally in an outer tub elastically supported by a housing, wherein a liquid is sealed inside the washing tub provided around the washing tub. A balancer which is a cylindrical hollow body partitioned into a plurality of rooms in which the inner peripheral side communicates with a partition provided radially on the inner peripheral side of the cylindrical hollow body; An operation in which the liquid is transferred from the first room to the second room by temporarily lowering the rotation speed at a timing according to the position of the eccentric load after substantially uniformly filling the plurality of rooms with the liquid. And a control means.