KR101367123B1 - Drum type Washing Machine - Google Patents

Abstract

     BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a drum washing machine, and more particularly, to a drum washing machine that improves the assembling performance of a balancer and a lifter installed in a rotary drum.

     The above and other objects can be accomplished by the provision of a washing machine comprising a washing machine main body, a rotatable washing machine rotatably installed in the washing machine main body, a lifter for washing laundry, a lifter installed inside the rotatable drum for lifting the laundry, The lifter is integrally formed with the balancer and is installed inside the rotary tub, thereby reducing the number of assembling holes, shortening the assembling time, and reducing the assembly cost.

Description

[0001] DRUM TYPE WASHING MACHINE [0002]

1 is a sectional view showing the internal structure of a drum type washing machine according to the present invention.

Fig. 2 is an exploded perspective view of the rotary tank shown in Fig. 1 with the balancer-integrated lifter. Fig.

                   Description of the Related Art [0002]

             10 ... rotatable trough 11 ... rotatable body

             20 ... lifter 30a ... front balancer

             30b ... rear balancer 31a ... front balancer housing

             31b ... rear balancer housing 32a ... front lower balancer housing

             32b ... rear lower balancer housing 33a ... front upper balancer housing

             33b ... rear upper balancer housing 40 ... balancer integral lifter

             50 ... balls

     BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a drum washing machine, and more particularly, to a drum washing machine that improves the assembling performance of a balancer and a lifter provided in a rotary drum.

     Generally, in a washing machine, a washing machine rotates a washing machine by rotating a washing machine with a washing machine. In the washing process, the washing machine rotates at a low speed in a direction opposite to the forward direction and the washing machine rotates at a high speed in a dehydrating process.

When the washing tub is rotated at a high speed during the dehydration process, or when the washing tub is rotated at a high speed while the washing tub is rotated at a high speed, the center of gravity of the tub and the center of rotation do not coincide with each other Vibration and noise. If this phenomenon is repeated, the parts including the rotating shafts, the rotating shafts, and the driving motors are broken or the service life is shortened.

In particular, the drum type washing machine has a structure in which the rotating tub containing the laundry is arranged horizontally, so that the laundry is rotated at a high speed while the laundry is collected at the bottom of the rotating tub by the gravity during the dehydration run, So that the possibility of vibration and noise is very high.

Therefore, in a vertical axis type washing machine including a drum type washing machine and a rotary drum set vertically, a balancer is usually provided to maintain dynamic balance of the rotary drum.

      An example of a drum washing machine having such a balancer is Korean Patent Laid-Open Publication No. 10-2005-0117004 (published on December 12, 2005). In the drum washing machine disclosed in this publication, a rotary tub is arranged horizontally, and when the rotary tub rotates in the forward and reverse directions about the horizontal axis, the lifter is lifted upwards along the inner peripheral surface of the rotary tub to drop the laundry, A liquid balancer for balancing the rotation of the rotating vessel and restraining the vibration is provided at the front end and the rear end of the rotating vessel, respectively.

     In the drum washing machine constructed as described above, the laundry is washed by the impact that the lifter lifts the laundry upward by the gravity when the rotating tub rotates at a low speed in the forward and reverse directions during the washing cycle, and the washing tub is rotated at a high speed in one direction during the spin- The liquid is disposed in a direction opposite to the direction in which the laundry is biased, so that balancing of the rotating tub is maintained.

     However, in the conventional drum type washing machine as described above, a plurality of lifters are usually assembled at predetermined intervals on the inner wall of the rotary tub by screwing. When the lifter is assembled, the operator inserts one hand into the rotary tub, And the other hand is screwed using a tool such as a screwdriver in the outside of the rotary drum, so that the assembling work is not easy.

     Further, since the lifter and the balancer are separately formed as separate parts and are installed inside the rotating tank, an assembling work for installing the balancer in the rotating tank is required separately from the lifting operation of the lifter, .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drum washing machine in which the assembling time and the assembling cost of the balancer and the lifter are reduced by improving the assembly and reliability of the balancer and the lifter.

     To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein,

A lifter provided in the washing tub and rotatable in the washing tub to wash laundry; a lifter installed in the tub to lift and drop the laundry when the tub is rotated; and an eccentric force generated by the laundry is offset Wherein the balancer is formed integrally with the lifter and is installed inside the rotating vessel.

In addition, the balancer is a ball balancer having an annular housing having a hollow inside and a ball moving in a circumferential direction inside the housing.

In addition, the lifter is provided in the longitudinal direction of the rotary tub, and the ball balancer is integrally formed at one end of the lifter.

The ball balancer may include a front balancer disposed in front of the rotary tub and a rear balancer disposed behind the rotary tub, wherein the lifter is integrally formed with the rear balancer.

Wherein the lifter and the balancer are integrally formed by plastic injection molding.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a cross-sectional view showing a schematic structure of a washing machine according to the present invention.

1, the washing machine according to the present invention includes a housing 1 forming an outer appearance, a water tub 2 installed inside the housing 1 and containing washing water, And a door 3 hinged to an opened front face of the housing 1. The door 3 is rotatably disposed in the housing 1,

A water supply pipe 4 and a detergent supply device 5 for supplying washing water and detergent to the water tub 2 are disposed at an upper portion of the water tub 2 and a washing tub 5 is disposed at a lower portion of the water tub 2, 2 is provided with a drain pipe 6 for discharging the washing water contained in the housing 1 to the outside of the housing 1.

A rotating shaft 7 is disposed on the rear surface of the rotary tub 10 so as to extend through the rear surface of the water tub 2 and a driving motor 8 is provided on the outer side of the rear surface of the water tub 2. Therefore, when the driving motor 8 is operated, the rotary shaft 7 rotates and rotates the rotary tub 10 together.

A plurality of dewatering holes 10a are formed in the circumferential surface of the rotary tub 10 so that the water contained in the tub 2 flows into the rotary tub 10 during the washing operation, So that water can be drained to the outside of the housing 1 through the drain pipe 6 during the dehydration process.

The laundry is washed by rotating the rotary tub 10 at a low speed while alternately rotating the rotary shaft 7 in the forward direction and the reverse direction by the drive motor 8 in the washing cycle. A plurality of lifters 20 are arranged in the longitudinal direction of the rotary tub 10 and the laundry is wetted as the rotary tub 10 rotates at a low speed and the laundry is lifted upward from the bottom of the rotary tub 10 The laundry is dropped to the bottom of the rotary tub 10 so that the laundry can be effectively washed.

During the dewatering process, the rotary drum 10 is rotated at a high speed by rotating the rotary shaft 7 in one direction to dehydrate the laundry. When the rotary drum 10 rotates at high speed at the beginning of the spinning cycle, In order to maintain the balance of the rotary tub 10 by canceling the eccentricity of the rotary tub 10 due to the biased laundry when the laundry adhered to the inner wall of the rotary tub 10 is unevenly distributed inside the rotary tub 10, Balancers 30a and 30b are provided in front of and behind the rotary tub 10, respectively.

The structure and the coupling structure of the lifter 20 and balancers 30a and 30b according to the present invention will be described with reference to Fig. FIG. 2 is an exploded perspective view showing a balancer-integrated lifter installed in a rotating tank and a rotating tank according to the present invention.

The structure and the coupling structure of the lifter 20 and balancers 30a and 30b according to the present invention will be described with reference to Fig. FIG. 2 is an exploded perspective view showing a balancer-integrated lifter installed in a rotating tank and a rotating tank according to the present invention.

As shown in the figure, the rotary tub 10 includes a cylindrical rotary tubular body 11 having a front portion and a rear portion open in the longitudinal direction of the rotary tub 10 and provided with a plurality of dewatering holes 10a, A front member 13 coupled to an open front portion of the rotary body 11 and provided with an opening 14 for allowing the laundry to be introduced into the body 11 or removed from the rotary body 11, And a rear member 15 coupled to an open rear portion of the rotary tub 10 and to which a rotary shaft 7 (see FIG. 1) for rotating the rotary tub 10 is coupled. A through hole 12 through which the screw is passed is formed on the outer circumferential surface of the rotatable tubular body 11 so that the balancer-integrated lifter 40 to be described later is engaged with the rotatable tubular body 11 by screwing. As shown in Fig.

The balancer-integrated lifter (40) according to the present invention is formed integrally with the lifter (20) and the balancer and is coupled to the inside of the body. The balancer includes a front balancer 30a provided on the front side of the rotatable tubular body 11 in the direction of the door 4 and a rear balancer 30b provided on the rear side of the rotatable tubular body 11 in the direction of the driving motor 9 , And the lifter 20 is installed so as to be integrally coupled with the rear balancer 30b.

The front and rear balancers 30a and 30b are provided with balancer housings 31a and 31b having ring-shaped annular hollow portions, operating oil (not shown) filled in the balancer housings 31a and 31b, And a ball 50 made of a plurality of metallic materials that moves in the circumferential direction along the inside of the balls 31a and 31b to perform a balancing function.

The balancer housings 30a and 30b are formed such that the upper portion thereof is opened so that the ball can be inserted and the ball is rolled along the circumferential direction of the balancer housings 30a and 30b to have a substantially " And upper balancer housings 33a and 33b which cover the openings of the lower balancer housings 32a and 32b and are installed to the outside of the rotating body 11, ). The upper balancer housings 33a and 33b may cover the openings of the lower balancer housings 32a and 32b in the form of a plate but may have a cross section of which one side is open like the lower balancer housings 32a and 32b is substantially a " Side openings may be formed so as to be opposed to each other.

The balancer housings 31a and 31b are made of a plastic material and the lower balancer housings 32a and 32b and the upper balancer housings 33a and 33b to which a plurality of balls are inserted are joined by fusion. In the fusion method between the lower balancer housings 32a and 32b and the upper balancer housings 33a and 33b, the joining portions are melted with heat and then heat-sealed or the lower balancer housings 32a and 32b and the upper balancer housings 33a and 33b are brought into contact with each other A method of spin fusion bonding in which friction heat is generated in the contact portion to be melted and then bonded is used.

The balancers 30a and 30b are installed on the rear side of the rotary tub body 11 in the direction of the drive motor 9 and include a front balancer 30a and a front balancer 30a provided in front of the rotary tub body 11 in the direction of the door 4, And the lifter 20 is configured to be coupled between the front balancer 30a and the rear balancer 30b. That is, the front and rear balancers 30a and 30b are respectively installed at both ends of the lifter 20 so as to be integrated with the lifter 20.

The outer diameter of the rear balancer housing 31b is formed to be substantially the same as the inner diameter of the rotary tub body 11 and the lifter 20 is arranged at a predetermined interval in the circumferential direction of the rear balancer housing 31b And when the balance lifter 40 is assembled to the rotary tub body 11, the lifter 20 can be installed on the inner wall of the tub body 11 without being separated from the inner wall of the tub body 11 In the circumferential direction of the rear balancer housing 31b. The front balancer 30a is formed to have a size substantially equal to the inner diameter of the rotary tub body 11 so as to be installed inside the rotary tub

The lifter 20 is formed of a plastic material and has a substantially trapezoidal cross section and is formed into a rod shape having a hollow portion in the inside thereof. The lifter 20 has a bottom portion 21 of a tie portion coupled to the rotating tubular body 11, And a top surface portion 22 of an end portion (short portion) facing the central axis of the rotating tubular body 11. [ The bottom portion 21 is formed with a fastening hole 23 in which a screw is fastened to the rotary tub body 11 so as to be screwed.

The rear balancer housing 31a and the lifter 20 made of a plastic material are integrally formed by plastic injection molding. More specifically, one end of the lifter 20 is integrally fixed to the rear lower balancer housing 32b and the other end of the lifter 20 is injection-molded so as to be free. The rear balancer housing 31b and the lifter 20 are integrally formed in such a manner that the rear balancer housing 33b is engaged with heat or spin fusion after the ball 50 of the rear balancer housing 33b is inserted.

The assembling process and operation effects of the drum washing machine having the balancer-integrated lifter according to the present invention constructed as described above will be described.

First, in the assembling process, the balancer-integrated lifter 40 integrally formed by plastic injection molding and fusion is press-fitted into the rotating tubular body 11 so as to press the fastening hole 23 of the lifter 20 and the rotating tubular body 11 After the balancer-integrated lifter 40 is coupled to the rotary tub body 11 using the fastening screws 60 after the through holes 12 are aligned with each other, the front balancer 30a is coupled to the front of the tub body 11 do.

Since the rear balancer 30b is integrally coupled to the lifter 20, the lifter 20 is fixed within the rotary tub body 11 by coupling the lifter 20 to the tub body 11. Therefore, However, the front balancer 30a needs to be separately fastened to fix the rotary balancer body 11.

After the front balancer 30a and the balancer-integrated lifter 40 are coupled to each other inside the rotary tub body 11, the front member 13 and the rear member 15 are respectively connected to the front portion They are fitted to the rim and the rear rim and are screwed or otherwise joined together.

Next, as for the action effect, in the washing stroke, the rotation shaft 10 rotates at a low speed while the rotary shaft 7 alternately rotates in the forward and reverse directions by the driving motor 8 so that the balancer-integrated lifter 40 is rotated 10, the lifter 20 lifts the laundry upward from the bottom of the rotary tub 10 and then drops to the floor to wash the laundry.

The balancer-integrated lifter 40 is rotated integrally with the rotary tub 10 by rotating the rotary tub 10 while rotating the rotary shaft 7 in one direction so that the balancer housings 31a and 31b are rotated together with the rotary tub 10, And the balls 50 are rotated by the centrifugal force of the balancer housings 31a and 31b when the rotational speed of the rotatable tub 10 is increased to reach a predetermined rotational speed and a predetermined time has elapsed, 31b. If the laundry is unevenly distributed in the rotary tub 10, the balls 50 are moved to the opposite side of the laundry by the centrifugal force, and the balls 50 generated by the laundry by the balls 50 moved to the opposite side of the laundry Thereby suppressing the vibration of the rotary tub 10 by canceling the cardiac force.

As described above, since the drum washing machine according to the present invention is formed integrally with the lifter and the balancer and is installed in the rotary drum, it is not necessary to separately assemble the balancer into the rotary drum, thereby reducing the assembly cost and the assembling time have.

In addition, since a plurality of lifters are screwed to the rotary tub body in a state in which they are pressed into the rotary tub with the balancer at one time, there is no need for the operator to fix the lifter separately for screw tightening, and the assembly work is facilitated .

Claims (7)

A washing machine body; A rotary tub rotatably installed in the washing machine main body to wash laundry; And an integral lifter coupled to the inside of the rotary tub and detachable from the rotary tub, The integrated lifter includes: An annular balancer provided at an end of the rotary tub and having a hollow portion for canceling eccentric force generated by the laundry; And a lifter that extends from the balancer to be lifted up and falls down and is seated in the rotary drum. The method according to claim 1, The outer diameter of the annular balancer, Wherein the drum washing machine is provided so as to correspond to the inner diameter of the rotary tub. The method according to claim 1, Wherein the lifter is provided so as to be parallel to a rotation axis direction of the rotary tub. The method according to claim 1, Wherein the balancer is a ball balancer having an annular housing having a hollow inside and a ball moving in a circumferential direction inside the housing. The method according to claim 1, Wherein the lifter is installed long in the longitudinal direction of the rotary tub. The method according to claim 1, The balancer includes: A front balancer installed in front of the rotating tub; And a rear balancer disposed behind the rotary tub, And the lifter is extended from the rear balancer. The method according to claim 1, Wherein the lifter and the balancer are coupled to the rotary tub at the same time.

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