KR0136042Y1 - A balancer of drum washing machine - Google Patents

Abstract

The purpose of the present invention is to arrange a plurality of rolling elements in the rotating tub and to configure the rolling elements to move freely in the opposite direction to the eccentric direction of the laundry, to effectively maintain the balance in response to the eccentricity of the laundry generated during the washing or dehydration process. It is to provide a balancing device for a drum washing machine that can suppress the generation of noise as possible.

The balancing device of the drum washing machine according to the present invention is provided with a drum-shaped fixing tub 20 suspended in the main body case 10, a rotating tub 30 rotatably installed in the fixing tub, and being concentrically provided with the rotating tub. At least two races (41) provided in the longitudinal direction of the group, each race includes a plurality of rolling elements 42 inserted into the moving material.

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

41: race 42: rolling element

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 that the installation work is difficult, and as a whole, the weight of the product is increased, making 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 object of the present invention is to arrange a plurality of rolling elements in the rotary tub and to configure the rolling elements to move freely in the opposite direction of the eccentric direction of the laundry generated during washing or dehydration process It is to provide a balancing device of the 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.

Balancing device of the drum washing machine according to the present invention for achieving the above object, a drum-shaped fixing tank suspended in the main body case, a rotating tank rotatably installed in the fixing tank, is provided concentrically with the rotating tank, the rotation At least two races provided in the longitudinal direction of the jaw, the configuration characterized in that it comprises a plurality of rolling elements inserted into each of 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 1. 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 on 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.

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 comprises a groove-shaped race 41 (RACE) formed concentrically with the rotating tub 30 on the front plate 31 and the rear plate 32 of the rotating tub 30. The race 41 includes a plurality of rolling elements 42 inserted as moving materials. The race 41 is filled with oil, and a ball-shaped steel ball is used as the rolling element 42. Instead of metal balls, rollers may be used, or they may be made of plastic.

Balancing means 40 according to the present invention is installed symmetrically at both front and rear ends of the rotating tub 30, because the structure is the same will be described in detail with reference to FIG. 3 with respect to the front end of the rotating tub 30 would. As shown in the figure, the balancing means 40 has three races 41 formed in the same radius on the rim of the front plate 31 of the rotating tub 30 and the rolling elements 42 inserted in the races 41. ). The race 41 is formed by a groove portion formed in an annular shape at the edge of the front plate 31, two partitions 44 are provided in the groove portion to form three races 41 by dividing the groove portion. The groove is formed between the bolt 13 and the outer end of the front plate 31. The outer surface of the race 41 which is located at the outermost side is sealed by a separate cover 43. The cover 43 is coupled to the front plate 31 by welding or the like, and is then coupled to the rotating tub 30 by the bolt 13 again.

Meanwhile, in the present embodiment, three races 41 are formed, but of course, two or four races may be installed. In addition, the lace 41 may be formed as a separate member, and the balancing means 40 may be formed by combining the member in which the lace 41 is formed in the rotating tub 30.

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. The laundry inside the rotary tub 30 is rolled up by the rotation of the rotary tub 30 or pulled up by the lifter 33b to be washed. 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 high speed by the motor 37, the rolling element 42 moves to the opposite side of the eccentric along the race 41 by the centrifugal force generated by the high speed rotation of the rotating tub 30. This compensates for the eccentricity and prevents 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 element 42 accommodated in the race 41 receives the centrifugal force generated on the basis of the geometric center and the centrifugal force generated on the basis of the rotational center at the same time, thereby moving in the opposite direction of the eccentricity by the force of the force. The rolling element 42 moved as described above rotates with respect to the geometric center of the rotating tub 30 so that the center of rotation of the rotating tub 30 coincides 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 particular, the balancing means are distributed in the longitudinal direction of the rotating tub, so that the balancing force is dispersed and applied to the side of the rotating tub, thereby preventing the rotating tub from being deformed by the balancing means.

Claims (2)

A drum-shaped fixing tub 20 suspended in the main body case 10, a rotating tub 30 rotatably installed in the fixing tub, concentrically provided with the rotating tub, provided at least two or more in the longitudinal direction of the rotating tub. Racer 41, a balancing device for a drum washing machine comprising a plurality of rolling elements (42) inserted into the moving material in each race. The balancing device of a drum washing machine according to claim 1, wherein the race is symmetrically provided at both end portions of the rotating tub.