KR101203422B1 - Clothes Washing Machine Having Balancer - Google Patents

Abstract

Provided is a washing machine having a balancer configured such that the balancer can be fixed simply and securely to a rotating tub. The balancer includes a first housing and a second housing, and a plurality of balls having a balancing action are disposed in an enclosed interior space formed by the first housing and the second housing, and the first housing and the second housing are injection molded. Is made. In the inner circumference of the balancer, a plurality of flanges having threaded holes are arranged at regular intervals so that the balancer is screwed into recesses provided in the front and rear of the rotary tub.

Description

Washing Machine Having Balancer

1 is a cross-sectional view showing a schematic structure of a drum washing machine according to the present invention.

Figure 2 is a perspective view showing that the balancer and the rotating tub is separated according to the present invention.

3 is an exploded perspective view of the balancer according to the present invention.

4 is a partial perspective view of a balancer according to the present invention.

5 is a cross-sectional view taken along the line A-A of FIG.

6 is a partial perspective view of a balancer according to another embodiment of the present invention.

Description of the Related Art [0002]

10: rotating tub 15: recess

20,20a: Balancer 21: Ball

22: flange 22a: screw hole

23: internal space 24: screw

30,30a: first housing 40,40a: second housing

The present invention relates to a washing machine having a balancer, and more particularly, to a washing machine having a balancer configured such that the balancer can be easily and firmly fixed to a rotating tub.

In general, a washing machine rotates a rotating tub containing laundry with a driving motor to wash the laundry. In the washing process, the rotating tub rotates at a low speed in the forward and reverse directions, and in the dehydration process, the rotating tub rotates at a high speed in the forward direction.

During the dehydration process, the rotating tub rotates at a high speed while the laundry is not evenly distributed in all areas of the rotating tub, but is concentrated in a specific part, or the rotating tub rotates at a high speed while the laundry is pushed to one side by the rapid rotation of the rotating tub early in the dehydration process. If the center of gravity of the rotating tub and the center of rotation do not coincide with each other, it causes vibration and noise, and if this phenomenon is repeated, components including the rotating tub, the rotating shaft, and the driving motor may fail or shorten the lifespan.

In particular, the drum type washing machine has a structure in which the rotating tub in which the laundry is placed is horizontally arranged so that the laundry rotates at high speed in the state where the laundry is collected at the bottom of the rotating tub by gravity during dehydration, so that the center of gravity and the rotation center do not coincide with each other. As a result, the possibility of vibration and noise is very high.

Therefore, a vertical shaft type washing machine including a drum type washing machine installed vertically is generally provided with a balancer for maintaining a dynamic balance of the rotating tank.

An example of a washing machine having such a balancer is Korean Laid-Open Patent Publication No. 1999-0038279. The ball balancer of the conventional washing machine has a racer installed in the upper and lower portions of the rotating tub to maintain a dynamic balance when the rotating tub rotates at a high speed, and a ball and a viscous oil made of steel material disposed freely in the racer. It is provided. The racer is formed by fusion of the annular upper plate and the lower plate.

Therefore, when the rotating tub rotates, the steel balls compensate for this when the rotating tub rotates without maintaining a dynamic balance due to the unbalanced eccentric structure of the rotating tub itself and the uneven distribution of laundry in the rotating tub. The dynamic balance can be maintained.

However, the ball balancer of the conventional washing machine as described above is made of a plastic material of relatively weak strength, and since the cross-sectional shape of the ball balancer is formed in a substantially rectangular shape, the ball balancer when a plurality of steel balls are circularly moved inside the ball balancer. The inner wall surface of the ball balancer is moved while being in contact with the ball balancer, so that the ball balancer's wall surface is deformed and the ball does not move smoothly, and the life of the ball balancer is shortened.

The present invention is to solve the above-mentioned problems of the prior art, an object of the present invention is to provide a washing machine having a balancer configured such that the balancer can be easily and firmly fixed to the rotating tub.

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According to an aspect of the present invention, a washing machine includes: a water tank accommodating water therein; and a rotating water tank rotatably disposed in the water tank and having an annular recess; and to compensate for dynamic unbalance during rotation of the water tank. A balancer installed in the annular recess of the rotating tub; wherein the balancer has an opening, an inner circumferential wall and an outer circumferential wall disposed to face each other, and a wall formed between the inner circumferential wall and the outer circumferential wall. A first housing, a second housing coupled to the first housing to cover the opening of the first housing to form an annular inner space, a plurality of balls movably disposed in the inner space of the balancer, and It is provided in the first housing, characterized in that it comprises a plurality of flanges having a fastening portion so that the balancer is coupled to the rotary bath.
The plurality of flanges may be arranged at regular intervals along the circumferential direction of the balancer.
The plurality of flanges may be integrally formed with the first housing.
The plurality of flanges may be formed on the inner circumferential wall of the first housing.
The second housing may protrude outward of the inner circumferential wall and the outer circumferential wall of the first housing to cover the inner circumferential wall and the outer circumferential wall.
The second housing may contact the inner wall of the recess when the balancer is installed in the recess of the rotating tub.
The first housing and the second housing may be injection molded from plastic.
The fastening part of the plurality of flanges may include a screw hole so that the balancer is screwed to the rotary bath.
The rotating tub includes a cylindrical body and a front member and a rear member disposed respectively at the front and the rear of the body, and the annular recess is formed at the front member and the rear member of the rotary tub, respectively, and the balancer Is provided in plurality, each balancer may be installed in the annular recess formed in the front member and the rear member.
In each balancer, a wall formed between the inner circumferential wall and the outer circumferential wall of the first housing may be disposed to contact the front of the front member and the rear of the rear member, respectively.
In addition, the balancer according to the spirit of the present invention is a balancer for a washing machine that can be installed in an annular recess formed in the rotating tub of the washing machine, the opening, the inner circumferential wall and outer circumferential wall disposed to face each other, the inner circumferential wall and the outer circumference An annular first housing having a wall formed between the wall; and a second housing coupled to the first housing to cover the opening of the first housing to form a space in the balancer; and the inside of the balancer. And a plurality of balls protruding from the first housing, the plurality of flanges protruding from the first housing and having a screw hole to screw the balancer to the rotary tub when the balancer is installed in the annular recess. Characterized in that.
The plurality of flanges may be arranged at regular intervals along the circumferential direction of the balancer.
The first housing and the second housing may be an injection molded material made of plastic, and the plurality of flanges may be integrally formed with the first housing.
The plurality of flanges may protrude from any one of the inner circumferential wall and the outer circumferential wall of the first housing.
The second housing protrudes to cover the outer circumference of the inner circumferential wall and the outer circumferential wall of the first housing, and may contact the inner wall of the recess when the balancer is installed in the recess of the rotary tub.
Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a cross-sectional view showing a schematic structure of a washing machine according to the present invention.

As shown in FIG. 1, the washing machine according to the present invention includes a housing 1 forming an external appearance, a water tank 2 installed inside the housing 1 and containing wash water, and an inside of the water tank 2. It is rotatably disposed and has a rotating tub (10) to put the laundry into the laundry and a door (4) hinged to the open front of the housing (1).

In the upper part of the water tank 2, a water supply pipe 5 for supplying washing water and detergent to the water tank 2 and a detergent supply device 6 are disposed, and in the lower part of the water tank 2, when the washing operation of the laundry is completed, the water tank ( A drain pipe 7 for discharging the wash water contained in 2) to the outside of the housing 1 is installed.

The rear side of the rotating tank 10 is disposed so that the rotating shaft 8 extends through the rear side of the water tank 2, and a drive motor 9 to which the rotating shaft 8 is coupled to the outer side of the rear water tank 2 is installed. Accordingly, when the driving motor 9 is operated, the rotating shaft 8 rotates to rotate the rotating tub 10 together.

A plurality of dehydration holes (10a) is formed on the circumferential surface of the rotary tub 10, during the washing stroke water contained in the water tank (2) flows into the interior of the rotary tub (10) and is washed by water in which detergent is dissolved This can be done, and during the dehydration stroke, the water can be drained out of the housing 1 through the drain pipe 7.

As the plurality of lifters 10b are disposed in the longitudinal direction inside the rotary tub 10, the laundry soaked with water is rotated upward from the bottom of the rotary tub 10 as the rotary tub 10 rotates at a low speed during the washing stroke. It is pulled up and dropped back to the bottom of the rotating tub 10 so that the laundry can be washed effectively.

Therefore, in the washing stroke, the rotating shaft 8 rotates in a reverse direction from the forward direction by the driving motor 9 to wash the laundry by rotating the rotating tub 10 at low speed. The laundry is dehydrated by rotating the rotary tub 10 at high speed while rotating in the direction.

When the rotating tub 10 rotates at a high speed in the dehydration process, the rotating tub 10 itself is not made to have a center of gravity and the same center of rotation, or laundry is not evenly distributed in the rotary tub 10 so that the laundry is placed in a specific area. In this case, the rotating tub 10 may not maintain a dynamic balance.

The balancer 20 according to the present invention is installed at the front and rear ends of the rotating tub 10 to prevent the dynamic unbalance so that the rotating tub 10 can be rotated at a high speed in a state where the rotating center and the center of gravity are matched. The configuration and coupling structure of the balancer 20 of the present invention will be described with reference to FIGS. 2 to 6.

Figure 2 is a perspective view showing that the balancer and the rotating tub is separated according to the present invention.

As shown in FIG. 2, the rotating tub 10 has a cylindrical body 11 in which the whole and the rear part are opened and the dehydration hole 10a and the lifter 10b are provided, and in the entire opened part of the body 11. Coupled to the front member 12 provided with an opening 14 for allowing laundry to be introduced into or taken out of the body 11, and coupled to the open rear portion of the body 11 and rotating the tub 10. It comprises a rear member 13 to which a rotating shaft 8 (see FIG. 1) for rotation is coupled.

In the rim of the front member 12 is provided with an annular recess 15 formed in an approximately 'c' shape and open toward the front so that the balancer 20 is accommodated. Similarly, the rim is provided with an annular recess 15 (not shown) that is open toward the rear to accommodate the balancer 20.

As shown in FIG. 3, the front member 12 and the rear member 13 are fitted to the front and rear edges of the body 11, respectively, to be screwed together or otherwise joined.

Balancer 20 according to the present invention is installed in the recess 15 of the front member 12 and the rear member 13, the balancer 20 is formed in an annular shape and a plurality of metals having a balancing function therein The ball 21 of the material and the viscous fluid (not shown) to be able to adjust the moving speed of the plurality of balls 21 is filled.

The annular balancer 20 has a plurality of flanges 22 having a screw hole 22a at an inner circumference thereof, and has an annular shape provided at the front member 12 and the rear member 13 of the rotating tub 10. The recess 15 is simply and quickly screwed together to be firmly assembled.

Next, a configuration of the balancer according to the present invention will be described with reference to FIGS. 3 to 5.

3 is an exploded perspective view of the balancer according to the present invention, FIG. 4 is a partial perspective view of the balancer according to the present invention, and FIG. 5 is a cross-sectional view taken along the line A-A of FIG.

3 to 5, the balancer 20 of the present invention is composed of an annular first housing 30 and an annular second housing 40 coupled to the first housing 30. Thus, one annular housing corresponding to the recess 15 (see FIG. 2) of the rotating tub 10 is formed. The first and second housings 30 and 40 are made by injection molding a synthetic resin such as plastic.

The first housing 30 having an approximately c-shaped cross section has both edges thermally bonded to both edges of the second housing 40 so that the balancer 20 is sealed to the ball 21 and the viscous fluid. The space 23 is formed.

The internal space 23 of the balancer 20 formed by the combination of the first and second housings 30 and 40 has a cross-section that forms a curved surface such that a plurality of balls 21 having a spherical shape have a balancer 20. By making contact with the inner wall of the inner wall surface rather than point contact, the force applied to the inner wall surface of the balancer 20 is distributed when a plurality of balls 21 are circularly moved in the inner space 23 of the balancer 20. To make it possible. Preferably, the inner space 23 of the balancer 20 has a circular cross section so that the movement of the ball 21 can be made stably and smoothly, and the force can be more effectively distributed.

The balancer 20 according to the present invention is fitted into the recess 15 provided in the front member 12 of the rotating tub 10 and the plurality of flanges 22 arranged at regular intervals on the inner circumference of the balancer 20. The screw hole 22a formed in the front member 12 is coupled to the screw 24 so that it can be easily and firmly assembled.

The balancer 20 of the present invention is coupled to the recess 15 provided in the rear member 13 of the rotating tub 10 in the same manner as described above to have a balancing action.

6 is a view corresponding to FIG. 4, showing a partial perspective view of a balancer according to another embodiment of the present invention.

As shown in FIG. 6, the balancer 20a according to another embodiment of the present invention is configured not to have a cross-sectional shape as a whole, but to have only one side as a curved surface.

That is, the balancer 20a is formed in an annular shape and heat-sealed with the first housing 30a so as to cover the open side of the first housing 30a having a 'c'-shaped cross section and the first housing 30a. And a second housing 40a coupled to each other, and only the outer circumferential side wall surface that receives the most weight and centrifugal force of the plurality of balls 21 in the first housing 30a is formed to have a curved surface.

Accordingly, when the plurality of balls 21 are circularly moved in the inner space 23 of the balancer 20a, the balls 21 are in surface contact with the outer circumferential side wall surface of the curved surface which receives the most weight and centrifugal force of the balls 21 by centrifugal force. It will move stably and smoothly.

In the embodiment of the present invention has been described by illustrating that the balancer is installed in the washing machine of the drum type, it is obvious that the rotating tub can also be applied to a vertical washing machine having a vertically arranged structure.

As described in detail above, the washing machine according to the present invention has a circular motion because the inner space of the ball balancer is formed in a circular cross section so that a plurality of spherical balls make circular motions while making surface contact with the inner wall of the balancer. The force acting on the inner wall surface of the balancer is distributed by a plurality of balls to make the ball move smoothly, and the deformation of the balancer is prevented, thereby extending the life of the balancer.

In addition, the washing machine according to the present invention has the structure that the balancer is easily and firmly screwed to the recess of the rotating tub has the effect that the assembly time of the balancer can be shortened and have a stable coupling structure.

Claims (15)

A water tank containing water; A rotating tank disposed rotatably inside the tank and having an annular recess; And a balancer installed in the annular recess of the tumbler to compensate for dynamic unbalance during rotation of the tumbler. A first housing having an opening, an inner circumferential wall and an outer circumferential wall disposed to face each other, and a wall formed between the inner circumferential wall and the outer circumferential wall; A second housing coupled to the first housing to cover the opening of the first housing to form an annular inner space; A plurality of balls movably disposed in an inner space of the balancer; And a plurality of flanges provided in the first housing and having a fastening portion to couple the balancer to the rotating tub. The method of claim 1, The plurality of flanges are washing machine, characterized in that arranged at regular intervals along the circumferential direction of the balancer. The method of claim 1, The plurality of flanges are washing machine, characterized in that formed integrally with the first housing. The method of claim 1, The plurality of flanges are formed on the inner circumferential wall of the first housing. The method of claim 1, And the second housing protrudes outward from the inner circumferential wall and the outer circumferential wall of the first housing to cover the inner circumferential wall and the outer circumferential wall. The method of claim 5, And the second housing contacts the inner wall of the recess when the balancer is installed in the recess of the rotating tub. The method of claim 1, The first housing and the second housing is a washing machine, characterized in that the injection molding of plastic. The method of claim 1, The fastening part of the plurality of flanges washing machine characterized in that it comprises a screw hole so that the balancer is screwed to the rotating tank. The method of claim 1, The rotating tub includes a cylindrical body and a front member and a rear member disposed respectively at the front and the rear of the body, The annular recess is formed in each of the front member and the rear member of the rotating tub, The balancer is provided in plural, each balancer is installed in the annular recess formed in the front member and the rear member. 10. The method of claim 9, And a wall formed between the inner circumferential wall of the first housing and the outer circumferential wall of the first housing in contact with the front surface of the front member and the rear surface of the rear member. In the washing machine balancer that can be installed in the annular recess formed in the rotating tub of the washing machine, An annular first housing having an opening, an inner circumferential wall and an outer circumferential wall disposed to face each other, and a wall formed between the inner circumferential wall and the outer circumferential wall; A second housing coupled to the first housing to cover the opening of the first housing to form a space in the balancer; A plurality of balls movably disposed in an inner space of the balancer; A plurality of flanges protruding from the first housing and having screw holes to screw the balancer to the rotary tub when the balancer is installed in the annular recess; Balancer for a washing machine comprising a. 12. The method of claim 11, Balancer for a washing machine, characterized in that the plurality of flanges are arranged at regular intervals along the circumferential direction of the balancer. 12. The method of claim 11, The first housing and the second housing is an injection molded material of plastic, And a plurality of flanges are integrally formed in the first housing. 12. The method of claim 11, And a plurality of flanges protrude from any one of the inner circumferential wall and the outer circumferential wall of the first housing. The method of claim 11, wherein the second housing, And a protruder so as to cover the outer circumference of the inner circumferential wall and the outer circumferential wall of the first housing, and contacting the inner wall of the recess when the balancer is installed in the recess of the rotary tub.

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