KR0136039Y1 - A balancer of drum washing machine - Google Patents

Abstract

An object of the present invention is to provide a balancing device for a drum washing machine to maximize the balancing effect by applying a centrifugal force of the rolling elements to the rotary tank at a right angle.

The present invention is provided with a drum-shaped fixing tub 20 suspended in a case 10, a rotating tub 30 rotatably installed in the fixing tub, concentrically provided with the rotating tub in the rotating tub, and having an inner third. The surface includes groove-shaped races 41a and 41b formed at right angles to the radius of rotation, and a plurality of rolling elements 42 inserted into the race as moving materials.

Description

Balancing Device for Drum Washing Machine

1 is a perspective view of a conventional drum washing machine.

2 is a cross-sectional view of the drum washing machine according to the present invention.

3 is a detailed view of the main portion of the balancing device of the drum washing machine according to the present invention.

* Explanation of symbols for main parts of the drawings

20: fixed tank 30: rotating tank

31: Front panel 32: Rear panel

41a, 41b: Race 411: First page

412: page 2 413: page 3

414: fourth page 42: rolling element

43: cover

The present invention relates to a drum washing machine, and more particularly, to a balancing device for a drum washing machine that installs races at both ends of a rotary tub and provides a plurality of steel balls as rolling elements to perform balancing during washing and dehydration.

The drum washing machine is a device for performing washing by a drop caused by the rotation of a drum having a drum shape, and washing, rinsing, and dehydration are automatically performed according to a pre-programmed program. During the dehydration operation of the drum washing machine, a balancing device is essential in the drum washing machine because severe vibration and noise may occur due to the eccentricity of the laundry.

1 is a perspective view showing a balancing structure of a conventional drum washing machine. Referring to this, the fixing tank (3) in which the drum-shaped rotating tank (2) is built into the main body case (1) is suspended by the upper suspension spring (4), and by the lower shock absorber (5). Supported. The rotating tub 2 is driven by a motor 6 installed at the bottom of the case 1, and a rotating shaft (not shown) is provided at the rear of the rotating tub 2 to transmit the rotational force of the motor 6 to the rotating tub 2. And pulleys (not shown) are installed. A plurality of small holes 7 are formed over the entire surface of the rotary tub 2, and a plurality of inwardly bent lifters 8 are arranged at predetermined intervals. The small holes 7 guide the fixed bath 3 and the rotating tank 2 to flow, and guide the water centrifuged from the laundry in the rotating tank 2 to the fixed tank 3 during dewatering. The lifter 8 functions to lift and drop the laundry.

In addition, counterweights 9a and 9b are mounted on the fixing tank 3 to prevent vibration generated during washing and dehydration. The counterweights 9a and 9b are composed of a front balance weight 9a attached to the front surface of the fixing tank 3 and an upper balance weight 9b attached to the upper side of the fixing tank 3, respectively, 11.4 kg and 12.2. It has a weight of about kg. The material of these counterweights 9a and 9b is cast iron, and is attached to the fixing tank 3 using the bolt 9c or the like.

However, such a conventional drum washing machine has the following problems. First, as described above, the weight of the counterweight is very large, so the installation work is difficult, and as a whole, the weight of the product is increased, which makes it difficult to handle in the distribution process. Second, during the washing or dehydration process, the amount of eccentricity of the laundry and the vibration thereof are directly transmitted to the fixing tank, and the balancing effect is lowered because the amount of the eccentricity and the vibration are simply suppressed or attenuated by the weight of the counterweight. Third, because the balance weight is bolted to the fixing tank, the coupling state of the balance weight is loosened due to corrosion or fatigue of the fastening portion generated by using for a long time, noise is generated, and in severe cases there is a problem that is broken.

Therefore, the present invention is to solve the above-mentioned problems, the main purpose of the present invention is to arrange a plurality of rolling elements in the rotating tank and to configure these rolling elements to move freely in the direction opposite to the eccentric direction of the laundry generated during washing or dehydration process It is to provide a balancing device for a drum washing machine that can effectively maintain the balance in response to the eccentric amount of the laundry to suppress the generation of vibration and noise as much as possible.

Another object of the present invention is to provide a balancing device for a drum washing machine to maximize the balancing effect by the centrifugal force of the rolling elements applied to the rotary tank at a right angle.

The balancing device of the drum washing machine according to the present invention for achieving the above object is provided with a drum-shaped fixing tank suspended in the case, a rotating tank rotatably installed in the fixing tank, concentric with the rotating tank in the rotating tank, Its inner three sides are characterized in that it comprises a groove-shaped race formed at right angles to the radius of rotation, a plurality of rolling elements inserted into the race as a moving material.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

Referring to FIG. 2, a drum-shaped fixing tub 20 is suspended inside the main body case 10. A plurality of suspension gas springs 11 are provided for the suspension of the fixing tank 20. The upper end of each suspension gas spring 11 is caught by the ceiling of the case and the lower end is coupled to the outer circumferential surface of the fixing tank 20. In addition, the shock absorber 12 is installed below the fixing tank 20.

The rotating tub 30 is rotatably installed inside the fixed tub 20. The rotating tub 30 includes a front plate 31 and a rear plate 32 and a cylindrical side plate 33 connecting them. The front plate 31 is formed with an opening 31a for inputting and withdrawing laundry. In the side plate 33, a plurality of small holes 33a are formed over the entire surface, and a plurality of lifters 33b bent inwardly in a V shape are arranged at predetermined intervals. The small holes 33a guide water to the fixing tank 20 and the rotating tank 30 during washing, and during dewatering, the centrifuged water is separated from the laundry in the rotating tank 30 to the fixing tank 20. To guide. The lifter 33b serves to lift and drop the laundry. The rotating shaft 34 is coupled to the back plate 32. The rotary shaft 34 is supported by a bearing 23 installed in the bearing housing 21 coupled with the fixing tank 20, and a pulley 35 is installed at the end. The belt 36 is coupled to the pulley 35 to transmit the rotational force of the motor 37 to the rotation shaft 34.

The balancing means 40 will be described with reference to FIGS. 2 and 3. Balancing means 40 are provided on the front plate 31 and the rear plate 32 to solve the imbalance caused by the eccentricity of the laundry during washing or dehydration. The balancing means 40 is a race 41a shaped like a groove 43a formed concentrically with the rotating tub 30 in the front plate 31 and the rear plate 32 of the rotating tub 30 ( 41B) (RACE) and a plurality of rolling elements 42 inserted into the race 41a and 41b as moving materials. Two races 41a and 41b are provided on the inner side and the outer side, the inner races 41a and 41b protrude inwardly into the rotating tub 30, and the outer races 41a and 41b protrude outwards. . Between each race 41a and 41b is sealed by welding, and oil is filled in the race 41a and 41b. As the rolling element 42, a ball-shaped steel ball is used.

At this time, it is preferable that the fourth surface 414 of the races 41a and 41b is formed with a large number of gradients so that the races 41a and 41b are easily removed from the mold during manufacture of the races 41a and 41b. Meanwhile, the laces 41a and 41b are formed by the cover 43 overlapping the front plate 31 and the back plate 32. The outer race 41b is the front plate 31 and the back plate 32. The inner race 41a is defined by the front plate 31 and the rear plate 32 and the cover 43, and the grooves 31b and 43a formed on the cover 43. Is defined by

Referring to FIG. 3, the races 41a and 41b may have a ring-shaped space including a first surface 411, a second surface 412, a third surface 413, and a fourth surface 414. Form. In this case, the third surface 413 and the fourth surface 414 are defined based on the rotation center of the rotating tub 30 or the races 41a and 41b, which are centers of rotation of the inner surfaces of the races 41a and 41b. The surface located outside of the surface, that is, the surface to which the centrifugal force of the rolling element 42 is applied is defined, and the fourth surface 414 defines the surface on the rotation center side. The third third surface 413 is formed to be perpendicular to the rotation radius of the rolling element 42, which is such that the centrifugal force of the rolling element 42, which is a balancing force, is applied to the races 41a and 41b at right angles. To maximize.

Next, the effect of the balancing device configured as described above will be described. In the washing stroke, the rotating tub 30 receives the rotational force of the motor 37 and rotates forward and backward. By the rotation of the rotating tub 30, the laundry inside the rotating tub 30 is rolled up by the lifter 33b, and is wash | cleaned by falling. During the dehydration stroke, the water is centrifuged out of the laundry by the high speed rotation of the rotating tub 30 and drained to the outside by an unshown drainage device. During such washing or dehydration administration, the rolling element 42 maintains balancing by moving in the direction opposite to the eccentric direction of the laundry. Therefore, almost perfect balancing is achieved and vibration-free and noise-free can be realized.

In detail, the laundry is located below the rotary tub 30. In this eccentric state, when the rotating tub 30 rotates at a high speed by the motor 37, the rolling element 42 follows the races 41a and 41b due to the centrifugal force generated by the high-speed rotation of the rotating tub 30. By moving to the opposite side of the eccentricity to compensate for the eccentricity to prevent the vibration and eccentric rotation of the rotating tub (30). That is, the center of rotation of the rotating tub 30 rotates in a state in which it is shifted from its geometric center by the eccentricity of the laundry. The rolling elements 42 accommodated in the races 41a and 41b receive the centrifugal force generated based on the geometric center and the centrifugal force generated based on the rotational center at the same time, thereby moving them in the opposite direction of the eccentricity by the force of the forces. . The rolling element moved in this manner rotates with respect to the geometric center of the rotating tank to match the center of rotation of the rotating tank with the geometric center. As a result, the eccentricity of the rotating tub is eliminated so that the vibration is eliminated and the noise is lost.

In addition, both sides of the race are formed to be inclined, and the rolling element is orthogonal to the third side of the race so that the balancing force is always applied to the race at right angles, thereby eliminating the reduction due to the dispersion of the balancing force generated, thereby maximizing the balancing effect. Can be. That is, the balancing effect is maximized because all the forces by the centrifugal force of the rolling elements are applied to the race to reduce the unbalance.

Claims (1)

A drum-shaped fixing tub 20 suspended in the case 10, a rotating tub 30 rotatably installed in the fixing tub, and provided in the rotating tub concentrically with the rotating tub, the inner third surface of which is rotated. And a groove-shaped race (41a) (41b) formed at right angles with respect to the raceway, and a plurality of rolling elements (42) inserted into the race as moving materials.