JPH04332596A - Washing machine - Google Patents

Abstract

PURPOSE:To prevent the influence of temperature change on a liquid balancer preliminarily. CONSTITUTION:A fixing boss 30 on a balancer 29 extends only in the radius direction of the balancer. The balancer 29 sealed with higher temperature liquid than normal temperature is fixed on a drum.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to washing machines.

0002

2. Description of the Related Art As a conventional example, a drum-type washing machine as shown in Japanese Patent Laid-Open No. 2-25294 (D06F33/02) will be described with reference to FIGS. 3 to 5.

1 is a frame made of sheet metal; 2 is a top plate disposed on the top of the frame 1; 3 is a clothing slot A formed in the center of the top plate 2; 4 is a clothes slot A formed in the center of the top plate 2; The upper lid 5 for opening and closing the input port A3 is an outer tank made of synthetic resin that is elastically suspended and supported within the frame 1, and has an opening 6 on the rear side.
It is formed into a cylindrical shape with a bottom. Reference numeral 7 denotes a rear plate that shields the opening 6, and a drying air passage 8, an air trap 9, etc. for introducing drying air into the outer tank 5 are integrally formed therein. Reference numeral 10 denotes a drying heater disposed within the drying air passage 8. Reference numeral 11 indicates a clothing input port B provided on the top surface of the outer tank 5, and 12 indicates the input port A3 and input port B11.
A bellows-shaped connecting pipe 13 for watertightly connecting the two is a transverse drum rotatably supported within the outer tank 5, and has a large number of through holes 14 around the periphery. 15 and 16 are a washing motor and a dewatering motor connected to the drum 13 via a pulley and a belt;
5 rotates the drum 13 at low speed during washing, and the dewatering motor 16 rotates the drum 13 in one direction at high speed during dewatering. 17 is an input key device.

The drum 13 is made of synthetic resin, and includes a bottomed cylindrical body 18, a fluid balancer 19 attached to the open end of the body 18, and a fluid balancer 19 fixed to the end face of the balancer 19. and an end plate 20.

The balancer 19 is a hollow annular body filled with a predetermined amount of salt water, and resistors 21 are provided inside at predetermined intervals to regulate the flow of salt water. 22・
. is a recess formed along the inner circumferential surface of the balancer 19, and the recess 22 also serves as a resistor. 2
Reference numeral 4 denotes a suction port provided at the center of the end plate 20 and facing the drying air path 8.

The balancer 19 is integrally formed with a boss 25 extending in the radial direction and a boss 26 extending in the axial direction.
and the bosses 26 are fixed to the end plate 20 with screws 28.

[0007]

[Problems to be Solved by the Invention] In the conventional example, the air inside the balancer 19 expands due to temperature changes, and the balancer itself swells to expand in the radial direction. Errors occur and assembly takes time,
After mounting on the drum, there is a problem that pressure is applied to the threaded portion, causing the threaded portion to loosen.

[0008] The present invention relates to improvements in washing machines and is intended to solve these problems.

[0009]

[Means for Solving the Problems] The washing machine of the present invention includes a balancer configured by sealing a liquid inside a hollow annular body and screwed onto a rotating tub. The fixing boss provided on the balancer is configured to extend only in the radial direction of the balancer.

Furthermore, the washing machine of the present invention has a balancer fixed to a rotating tub, which is constructed by filling a hollow annular body with a liquid having a temperature higher than room temperature.

[0011] The standard temperature is the average temperature for one year.

0012

[Operation] In other words, when the air inside the balancer expands, the balancer expands in the radial direction so that its inner diameter becomes smaller and its outer diameter becomes larger. Since there is only a boss extending in the direction, it is difficult to apply pressure from the side to the screw.

[0013] Furthermore, when sealing liquid in the balancer,
If you use a balancer with a temperature higher than room temperature, when the liquid cools down to room temperature, the air inside the balancer contracts and creates negative pressure. Therefore, even if the temperature around the balancer becomes higher than normal temperature, expansion of the air inside the balancer is suppressed because the pressure is initially negative.

[0014]

Embodiments Examples of the present invention will be explained based on the drawings.

FIG. 1 shows a first embodiment. The fixing boss 30 of the balancer 29 only extends in the radial direction. In FIG. 4, the balancer 19 is held between the body portion 18 and the end plate 20, but in this embodiment, an annular recess 32 is formed along the periphery of the end plate 31, and the balancer 29 is placed within this recess 32. It is accommodated. Furthermore, the end plate 31 (the recess 3
A 90-degree folded part 33 is provided at the peripheral end of 2), and this is inserted between the balancer 29 and the open end of the body part 18, and these three parts are held together by the screw 34 and the boss 30. It's tightened. At this time, the dimensional relationship is set so that a slight gap 35 is formed between the inner periphery of the balancer 29 and the recess 32.

As is well known in the art, the balancer 29 is constructed by aligning the open ends of a pair of annular groove bodies 29a and 29b and thermally welding them together to form a hollow annular body 29c.
A hole for liquid injection is provided in a part of 9c, and the hole is stopped after injection.

Therefore, when the balancer 29 expands in the radial direction due to a temperature change, the inward expansion of the balancer 29 is absorbed by the gap 35 being reduced, and the outward expansion is absorbed. Since this is the direction in which the screw 34 is tightened, this screw portion will not loosen.

At this time, if a disc spring 36 is interposed in the threaded portion as shown by the enlarged arrow, outward expansion can be absorbed.

In the second embodiment, the salt water inside the balancer 19 of the conventional example and the balancer 29 of the first embodiment is heated to a temperature higher than room temperature (in order to be used in a device that performs drying as in the present invention, it is necessary to (preferably at a temperature of approximately 70°C). By doing this, when the salt water cools down to below room temperature, the air inside the balancer contracts and the inside of the balancer is maintained at a negative pressure state.

The balancer of the first embodiment is employed in a conventional horizontal shaft type drum type washing machine or a washing machine having a vertical shaft type washing tub.

[0021]

[Effect of the invention] In the washing machine according to claim 1 of the present invention,
Even if the balancer expands due to temperature changes, pressure is unlikely to be applied to the threaded portion, allowing it to remain firmly fixed.

Furthermore, in the washing machine according to claim 2 of the present invention, since the liquid sealed in the balancer is at a temperature higher than normal temperature, when the liquid cools down to normal temperature, the liquid inside the balancer is heated. The air contracts and becomes negative pressure. Therefore, even if the temperature around the balancer becomes higher than room temperature, the expansion of the air inside the balancer is suppressed because the pressure is initially negative, thereby preventing problems such as dimensional errors and deformation due to expansion of the balancer. Can be done.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a balancer section in a drum-type washing machine of the present invention.

FIG. 2 is a schematic perspective view of a conventional drum-type washing machine.

FIG. 3 is a longitudinal sectional view as well.

FIG. 4 is an exploded perspective view of the drum.

FIG. 5 is a diagram corresponding to FIG. 1;

[Explanation of symbols]

13 Drum (rotating tank) 29 Balancer 29c Annular body 30 Boss

Claims (2)

[Claims] 1. A balancer configured by sealing liquid inside a hollow annular body is screwed onto a rotating tank, wherein a fixing boss provided on the balancer is configured to extend only in the radial direction of the balancer. A washing machine characterized by: 2. A washing machine comprising: a balancer configured by using liquid at a temperature higher than room temperature when sealing liquid inside a hollow annular body; fixed to a rotating tub;