KR19990066051A - Centrifugal balancing device of washing machine - Google Patents

Abstract

The present invention relates to a device for reducing the dehydration vibration of a washing machine and a washing tub 4 and a dewatering tank 5 are provided in multiple layers on a rotary shaft 61 in a case 1 and a rotary shaft 61 And an upper liquid balancer 9 is mounted on the inner periphery of the upper portion of the dewatering tank 5 and an inner bottom portion of the dewatering tank 5 is connected to the rotary shaft 2 and the clutch 3, And a pulsator 60 coupled to the pulsator 61. The lower balancer B is fixed to the bottom of the pulsator 60. The pulsator 60 is provided with a laundry remover 12, The lower balancer B is mounted on the bottom of the pulsator 60 so as to prevent interference with the laundry debris collecting passage 12 in the dehydrator 5 of the washing machine, Absorbs vibration and noise caused by imbalance caused by ubiquitous and stable Of being able to maintain the system, the initial transient suppressing vibration relates to a centrifugal balance adjustment device of the washing machine being able to improve the performance balance.

Description

Centrifugal balancing device of washing machine

The present invention relates to an apparatus for reducing dehydration vibration of a washing machine, and more particularly, to a washing machine having a washing debris collecting path, in which a lower balancer is mounted so as not to interfere with the laundry debris collecting path, The present invention relates to a centrifugal balance adjusting device for a washing machine, which can maintain a stable system by absorbing vibrations and noise generated due to an imbalance caused by an omnipresence of a balancer, and to improve balancing performance by suppressing initial transient vibration of the balancer.

1 schematically shows a structure of a pulsator washing machine provided with a laundry waste collecting duct 12 which is generally used. A motor 2 is fixedly installed on a lower side of a washing machine case 1, A clutch 3 connected to the motor 2 is mounted on the lower end of the center shaft of the case 1 and a washing tank 4 and a dewatering tank 5 And a pulsator 6 is coupled to the inner bottom surface portion of the dewatering tank 4 on the central axis and the washing tub 4 is mounted on the outer circumference of the lower end of the washing tub 4 A damper 7 and a snubber bar 8 coupled to the damper 7 and absorbing vibrations are symmetrically fixed to each other and are arranged along one inner wall from the lower end to the upper end of the dewatering tank 5, A laundry waste recovery passage 12 for removing the generated lint is formed And a ring-shaped upper and lower liquid balancers 9 and 10 for compensating unbalanced translational and rotational movements of the washing tub 4 and the dewatering tub 5 are provided at the upper and lower inner peripheral edges of the dewatering tank 5 It has a fixed structure.

The conventional washing machine can smoothly dewater by rotating the washing tub 4 and the dewatering tub 5 without eccentricity when the laundry 11 is balanced at the time of dewatering. However, if the laundry 11 is in an unbalanced state Centrifugal force acts on the side of the center of gravity where the center of gravity is deviated in the centrifugal dewatering process, so that the washing tub 4 and the dewatering tank 5 are severely shaken.

The damper 7 and the snubber bar 8 support the washing tub 4 as described above so that the impact generated in the washing tub 4 and the dewatering tub 5 can be absorbed by the washing machine 4, Thereby preventing noise and vibration from being transmitted to the case 1.

Meanwhile, the upper and lower liquid balancers 9 and 10 are attached to compensate for the unbalanced mass generated when the laundry 11 is unevenly distributed at the time of dewatering the laundry 11, And a balancing liquid is accommodated to flow in a direction corresponding to the unbalanced mass to maintain equilibrium.

The operation of centrifugal balancing by the conventional upper and lower liquid balancers 9 and 10 having the above-described structure will be described as follows.

2A and 2B are views for explaining the centrifugal balance adjustment operation of the upper and lower liquid balancers 9 and 10 when the laundry 11 having a balancing capacity exceeding the balancing capacity is put into a state of being unevenly distributed in the upper part or the lower part of the washing machine according to the related art FIG. 2A is a schematic view showing a state in which vibration is reduced when the laundry 11 is loaded at a height of 2/5 of the lower portion of the washing machine dewatering apparatus 5. FIG. Of the laundry 11 is loaded on the upper 4/5 height.

That is, as shown in FIG. 2A, when the maximum amount of compensation by the upper and lower liquid balancers 9 and 10 is 200 g, the laundry 11 in the dewatering stage 2 / 5, and an unbalanced mass of about 500 g which slightly exceeds the maximum compensating capacity of the upper and lower liquid balancers 9, 10 is loaded, the unbalanced mass causes a predetermined eccentric distance between the center of rotation and the center of gravity And the unbalanced mass and the balancing liquid are unevenly distributed in the same direction until the first resonance occurs, thereby causing a large amplitude and causing vibration noise. When the first resonance occurs thereafter, the balancing liquid maintains a phase difference of 180 °, and the unbalanced mass is largely compensated for, so that the translational vibration displacement is significantly reduced.

Numerically, the vibrations of the translational and rotational motion are numerically calculated,

The size for the translational vibration,

(The mass of the laundry 11 is 500 g) - {the mass of the upper and lower liquid balancers 9 and 10 is 400 g} = 100 g "

The size for the rotational vibration is,

(Mass of the upper liquid balancer 9: 200 g × Arm length height (L3) 5} + {mass of the lower liquid balancer (10) 200g × Arm length height (L1) 1} - {mass of laundry (11) 500 g × Arm length height (L2) 2} = 200g "

.

2B, when the laundry 11 is dewatered, the maximum amount of compensating ability by the upper and lower liquid balancers 9 and 10 is 200 g, 5, and an unbalanced mass of about 500 g which slightly exceeds the maximum compensating capacity of the upper and lower liquid balancers 9, 10 is loaded, the unbalanced mass causes a predetermined eccentric distance between the center of rotation and the center of gravity And the unbalanced mass and the balancing liquid are unevenly distributed in the same direction until the first resonance occurs, thereby causing a large amplitude and causing vibration noise. When the first resonance occurs thereafter, the balancing liquid maintains a phase difference of 180 °, and the unbalanced mass is largely compensated for, so that the translational vibration displacement is significantly reduced.

Numerically, the vibrations of the translational and rotational motion are numerically calculated,

The size for the translational vibration,

(The mass of the laundry 11 is 500 g) - {the mass of the upper and lower liquid balancers 9 and 10 is 400 g} = 100 g "

The size for the rotational vibration is,

&Quot; {mass of laundry (11) " 500 g × Arm length height (L2) 4} - {{mass of upper liquid balancer 9: 200 g × Arm length height (L3) 5} + {mass of the lower liquid balancer (10) 200g × Arm length height (L1) 1}] = 800 g "

.

Therefore, when there is an unbalanced mass on the lower side of the dehydrator 5, the magnitude of the up / down translation vibration increases, and when there is an unbalanced mass on the dehydrator 5, do.

In addition, when the user operates the washing machine 11 after putting the laundry 11 at a rate of 60% or less of the rated washing capacity, the direction of the unbalance mass that actually occurs is close to the lower side, and particularly, a small amount of laundry 11 and then operates, the leaning of the washing tub 4 and the dewatering tank 5 is further excited from the lower side.

Therefore, there is a need to provide a large-capacity ball balancer capable of replacing the lower liquid balancer 10 described above.

However, in the conventional washing machine, as described above, in most conventional washing machines provided with the laundry waste collecting passage 12, the laundry waste collecting passage 12 is located at the inner lower end of the dehydrating tank 5, There is a problem in that it is difficult to secure a separate space in which the ball balancer can be installed in the lower part of the structure of the motor 5.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a washing machine with a washing machine, Which is capable of maintaining a stable system by absorbing vibrations and noise generated due to an imbalance caused by the omnipresence of laundry during a washing operation, and improving balancing performance by suppressing initial transient vibration of the balancer. There is a purpose.

1 is a schematic view showing the structure of a conventional pulsator washing machine,

FIGS. 2A and 2B are diagrams illustrating a vibration reduction state by a centrifugal balance adjustment action of upper and lower liquid balancers when laundry having a balancing capacity exceeding a balancing capacity is put in a state where it is unevenly distributed in an upper portion or a lower portion of a conventional washing machine.

FIG. 2A is a schematic view showing a vibration-reduced state when laundry is loaded at a predetermined position under the washing machine dewatering tank,

FIG. 2B is a schematic view showing a vibration reduction state when laundry is loaded at a predetermined position on the upper portion of the washing machine dewatering apparatus,

3 is a schematic view showing a centrifugal balance adjusting device of a washing machine according to the present invention,

FIG. 4 is a partial cross-sectional view illustrating a structure of a lower ball balancer fixedly installed on a pulsator of the present invention.

DESCRIPTION OF REFERENCE NUMERALS

B; Lower balancer 1; case

2 ; Motor 3; clutch

4 ; Washing tub (outer tub) 5; Dewatering tank (inner tank)

7; Damper 8; Snubber bar

9; An upper liquid balancer 10; Bottom liquid balancer

11; Laundry 12; Washing residue recovery

60; Pulsator 61; Rotating shaft

63; Upper lace 64; Lower race

65; Space portion 66; Vertical diaphragm

67; Metal ball 68; Working oil

69; Sealing chamber

According to an aspect of the present invention, there is provided a centrifugal balance adjuster for a washing machine, comprising: a washing tub and a dewatering tank provided in a double layer on a rotating shaft of a case; a motor and a clutch for driving the rotating shaft are connected to the lower portion, And a lower balancer is fixed to a lower surface of the pulsator, wherein the lower balancer is fixed to the lower surface of the pulsator, wherein the upper liquid balancer is mounted on the periphery of the upper part of the tank and the pulsator is coupled to the rotation shaft on the inner bottom surface of the dewatering tank.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 and 3, a washing machine according to the present invention is provided with a motor 2 fixed to a lower one side of a case 1 and a motor 2 installed at a lower center of the case 1, A washing tank 4 and a dewatering tank 5 are provided in a plurality of layers on the rotary shaft 61 of the clutch 1. The inner bottom surface of the dewatering tank 4 is provided with a pulsator A damper 7 for supporting the washing tub 4 in all directions is attached to the outer circumference of the lower end of the washing tub 4 and a snubber bar (8) are symmetrically fixed to each other, and a washing residue collecting passage (12) is formed along one inner wall from the lower end to the upper end of the dewatering tank (5) The unbalanced translational / rotational motion of the washing tub 4 and the dehydrating tub 5 is compensated for at the upper and lower inner peripheral edges of the dehydrating tub 5, The upper and lower liquid balancers 9 and 10 are fixed in a ring shape.

A separate lower balancer B is fixed to the bottom of the pulsator 60. 4, the lower balancer B includes upper and lower races 63 and 64 which are fixed to the bottom of the pulsator 60, upper and lower races 63 and 64, A vertical diaphragm 66 formed to have a space 65 communicating with the ball 65 and a plurality of metal balls 67 filled in the space 65 and a hydraulic oil 68, .

The upper and lower races 63 and 64 are each formed by an injection molding and are formed by high frequency welding or heat welding of the adjacent portions of the upper and lower races 63 and 64, And is integrally formed on the columnar surface. The material of the upper and lower races 63 and 64 is made of a synthetic resin or a metal product. In the drawing, reference numeral 69 denotes a sealing chamber for sealing the rotating shaft 61 of the clutch 3.

In some cases, the lower balancer B may be fixed to the bottom surface of the pulsator 60 by means of fastening means such as screws or the like so as to be disassembled and assembled.

Therefore, according to the present invention, it is possible to mount the lower balancer B without changing the structure of the conventional washing machine dewatering apparatus 5.

The liquid balancer may be fixed to the bottom surface of the pulsator 60 in addition to the ball balancer described above. A pair of upper and lower races 63 and 64 fixed to the bottom of the pulsator 60 and a space 65 communicating with the upper and lower races 63 and 64, And a balancing liquid which is filled in the space 65 and whose flow rate is controlled by the vertical diaphragm 66. The liquid balancer may be fixed to the vertical balancer.

An operation process of centrifugal balance by the upper and lower balancers 9 and 9 according to the present invention having the above-described structure will be described as follows.

When the unbalanced mass is loaded in the dewatering tank 5 due to the dehydration of the laundry 11 during dewatering, a predetermined eccentric distance exists between the center of rotation and the center of gravity due to the unbalanced mass, and until the first resonance occurs, And the metal balls 67 in the lower balancer B are unevenly distributed in the same direction to generate vibration noise, and when the first resonance occurs thereafter, the phase difference of 180 ° is maintained The unbalanced mass of the lower balancer B is compensated for by the mass action of the lower balancer B because the unbalanced mass of the lower portion of the dehydrating tank 5 is quickly compensated for by the action of the mass of the lower balancer B, Can be significantly reduced.

In some cases, the mass of the metal ball 67 may be increased to further increase the lower eccentricity compensation capability.

The effects of the present invention, which can be expected from the above-described configuration and operation, are as follows.

The centrifugal balance adjusting device of the washing machine according to the present invention is characterized in that the bottom of the pulsator 60 is disposed in the dehydrating tank 5 of the washing machine provided with the washing debris collecting passage 12 so as not to interfere with the washing debris collecting passage 12 The lower balancer B is mounted on the lower portion of the laundry 11 to absorb the vibration and noise generated due to the unevenness caused by the lower portion of the laundry 11 during the centrifugal dewatering so as to maintain a stable system and to suppress the initial transient vibration, Can be improved.

Claims (6)

A washing machine and a dewatering tank are provided in a double layer on a rotating shaft in a case, and a motor and a clutch for driving the rotating shaft are connected to a lower portion thereof. An upper liquid balancer is mounted on the inner periphery of the upper part of the dewatering tank. And a pulsator coupled to a rotating shaft, wherein a lower balancer is fixed to a bottom portion of the pulsator. The lower balancer according to claim 1, wherein the lower balancer comprises: a vertical diaphragm formed to have a pair of upper and lower races fixed to a bottom portion of the pulsator, and a space portion communicating with the upper and the lower races, Wherein the ball balancer is a ball balancer composed of a plurality of metal balls and working oil to be filled in the washing machine. The lower balancer according to claim 1, wherein the lower balancer comprises: a vertical diaphragm formed to have a pair of upper and lower races fixed to a bottom portion of the pulsator, and a space portion communicating with the upper and the lower races, And a balancing liquid which is filled in the vertical diaphragm and whose flow rate is controlled by the vertical diaphragm. The centrifugal balance adjuster according to claim 2 or 3, wherein the upper and lower races are each formed of an injection molding, and adjacent portions of the upper and lower races are welded together. The apparatus of claim 1, wherein the balancer is integrally formed on a circumference of the pulsator bottom portion. The centrifugal balance adjuster according to claim 1, wherein the balancer is fixed to a bottom surface of the pulsator using a fastening means such as a screw or the like so as to be disassembled and assembled.