KR100198333B1 - Damping apparatus of a washer - Google Patents

Abstract

The present invention relates to a shock absorber for a washing machine, which minimizes vibrations during dewatering by changing the center of gravity of the damper to vary the center of gravity of the damper. ; A wrinkle member formed on an outer peripheral surface of the water tank at a lower portion of the damper and extending and contracted up and down; A power switching member provided on a bottom surface of the water tank below the corrugated member to selectively drive the pulsator and the washing tub in the water tank; And a plurality of radially extending outer peripheral surfaces of the water tub are provided with variable means for forcibly expanding and contracting the corrugated members so that the centers of gravity of the laundry and the positions of the dampers coincide with each other.

Description

Washing machine shock absorber

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber for a washing machine, and more particularly, to a shock absorber for a washing machine which minimizes vibrations during dewatering by making the center of gravity variable according to the weight of a laundry.

Generally, as shown in FIG. 1, a washing machine is provided with a water tub 2 and a washing tub 3 inside a main body 1, and a pulsator 4 for generating a water flow inside the washing tub 3.

A motor 5 and a power switching member 5a for selectively driving the washing tub 3 and the pulsator 4 are provided on the bottom surface of the water tub 2.

Further, the water tub 2 is suspended from the hanging rods 6 installed in four directions inside the main body 1. At this time, a damper 6a having a spring incorporated therein is provided at the lower end of the hook rod 6, so that vibration of the water tub 2 is alleviated. In the conventional washing machine constructed as described above, when washing and washing water are supplied into the washing tub 3 during washing and the power switching member 5a is rotated in the forward and reverse directions by driving the motor 5, water flows by the pulsator 4, It proceeds. Dehydration is also carried out after washing.

When the washing water is drained at the time of dewatering and the power switching member 5a is operated by driving the motor 5, the washing tub 3 is rotated at a high speed and the laundry feeling is dewatered by the centrifugal force. In addition, the vibration generated during dewatering is alleviated by the damper 6a.

However, since the position of the damper 6a and the center of gravity of the laundry are inconsistent, there is a disadvantage that the vibration suppressing effect is reduced. That is, the center of gravity of the laundry to be dewatered is different according to the amount of the laundry, while the position of the damper 6a is fixed to the lower part of the water tub 2, and if the center of gravity of the laundry does not coincide with the position of the damper 6a There is a disadvantage that vibration is generated depending on the degree of discrepancy.

The present invention relates to a washing machine, a washing machine, and a washing machine, A wrinkle member formed on an outer peripheral surface of the water tank at a lower portion of the damper and extending and contracted up and down; A power switching member provided on a bottom surface of the water tank below the corrugated member to selectively drive the pulsator and the washing tub in the water tank; And a plurality of variable means provided radially on the outer circumferential surface of the water tank for forcibly expanding and contracting the corrugated member so that the center of gravity of the laundry is aligned with the position of the damper.

1 is a sectional view of a conventional washing machine;

FIG. 2 is an exploded perspective view of the shock absorber according to the present invention. FIG.

3 (a) and 3 (b) are sectional views of the washing machine of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

10: main body 11: aquarium

12: washing tub 13: pulsator

15: power transmission member 16: hooking rod

17: damper 12: wrinkle member

30: variable means 31: bracket

32: cylinder 33: piston rod

35: Pump

FIG. 2 is an exploded perspective view of the shock absorber according to the present invention. FIG. A damper 17 in which a spring 17a is embedded is installed on the lower side of the water tub 11 and each damper 17 is connected to the hooking rod 16. A flexible member 20 having an elasticity in the axial direction is formed on the outer circumferential surface of the water tub 11 under the damper 17 and a flexible member 20 is formed and the flexible member 20 is forcibly lifted and raised in the axial direction (30).

The variable means (30) comprises a bracket (31) radially coupled to the outer circumferential surface of the water tub (11) on the upper side of the corrugated member (20); A cylinder 32 fixed to each bracket 31; And a receiving portion 37 formed at the upper end of the piston rod 33 of each cylinder 32 and joined to the bottom surface of the water tub 11.

Each of the brackets 31 is fitted in a boss 34 protruding from the water tub 11 so that the screw 38 is fastened and the cylinder 32 is placed on the support piece 36 bent at the lower end of each bracket 31. Each of the cylinders 32 is operated by a pump 35 to be described later so as to move the piston rod 33 up and down.

3 is a sectional view of the washing machine of the present invention in which a water tub 11 and a washing tub 12 are provided inside a rectangular main body 10 and a lower end of a hook bar 16 provided in a square on the inside of the main body 10, And the water tub 11 is installed in the main body 10 so as to be suspended.

A pulsator 13 is installed in the washing tub 12 and a power switching member 15 and a motor 140 are installed on the bottom surface of the tub 11 to selectively drive the pulsator 13 and the washing tub 12 A pump 35 for raising and lowering the piston rod 33 by supplying hydraulic pressure to the cylinder 32 provided on each bracket 31 is provided inside the main body 10. [

As shown in FIG. 3 (a), if the state in which the cylinders 32 are not operated is assumed to be neutral, the washing process proceeds in the neutral state. In other words, the washing feeling and washing water are contained in the washing tub 12, and then the pulsator 13 is rotated in the forward and reverse directions by the operation of the motor 14 and the power switching member 15, so that the laundry is washed by the water flow.

The vibration generated in the washing tub 12 during washing is transmitted to the brackets 31 via the piston rod 33 and the cylinder 32. At this time, since the upper end of each bracket 31 is coupled to the water tub 11 above the corrugated member 20, the vibration of the washing tub 12 is transmitted to the water tub 11 and the damper 17 The vibration is relaxed.

Also, after the washing is completed, the washing water is drained and dehydration proceeds. At this time, the washing tub 12 is raised or lowered depending on the weight of the laundry. For example, when washing is performed on a high water level, the weight of the laundry is large, and the center of gravity is placed on the upper side of the damper 17. Therefore, when dewatering, the piston rod 33 of each cylinder 32 is lowered to a state of the state shown in FIG. 3 (b). At this time, the folding member 20 is stretched, and the power switching member 15 and the motor 14 are lowered, and the washing tub 12 and pulsator 13 are lowered.

The center of gravity of the laundry is matched with the height of the damper 17. At this time, the operation of the motor 14 and the power switching member 15 causes the washing tub 12 to rotate at a high speed and dehydration proceeds. The vibration generated during dewatering is transmitted to the cylinder 32 and the bracket 31 via the receiving portion 37 and the piston rod 33. At this time, the water tank 11 to which the bracket 31 is fixed is vibrated, and the vibration is mitigated by the damper 17.

In addition, when the dewatering is performed, the center of gravity of the laundry is matched with the height of the damper 17, so that vibration is mitigated. The water tub 11 is suspended from the main body 10 by the damper 17 so that the centrifugal force of the laundry is moved away from the damper 17 to the water tub 11. [ At this time, the moment of the circumferential direction in which the center of gravity of the laundry acts on the side of the water tub 11 through the damper 17 is increased to increase the vibration. Accordingly, when the center of gravity of the laundry is matched with the height of the damper 17 as in the present invention, the moment is reduced, and as a result, the vibration is reduced.

Further, when washing is performed at a low level, the weight of the laundry is small, and the washing machine is positioned below the damper 17 at the center of gravity. At this time, the piston rod 33 is raised to raise the pulsator 13, the washing tub 12, the power switching member 15 and the motor 14 as shown in the virtual line of FIG. 3 (a) ). When dehydration proceeds in this state, the water tub 11 is not oscillated in the circumferential direction, and the vibration thereof is mitigated by the damper 17.

In order to accurately measure the weight of the laundry, a weight sensor may be provided on the receiving portion 37 at the upper end of the piston rod 33. When the weight sensor is installed as described above, the lifting and lowering of the piston rod 33 is determined in proportion to the measured weight of the laundry when dewatering, and accordingly, the center of gravity of the laundry and the position of the damper 17 can be accurately set.

According to the present invention, the height of the washing tub is changed according to the weight of the laundry to match the center of gravity of the laundry and the position of the damper formed in the tub. When this is done, the moment generated in the circumferential direction of the water tank during dehydration is reduced, and the vibration is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shock absorber of a washing machine which changes the center of gravity of a laundry to match the height of a damper, thereby minimizing vibration during dewatering.

Claims (2)

A water tub (11) suspended from the inside of the main body (10) through a lower end of a hook bar (16) formed in four directions and a damper (17); A folding member 20 formed on the outer circumferential surface of the water tub 11 under the damper 17 and extending and contracted up and down; A power switching member 15 installed on the bottom of the water tub 11 under the corrugated member 20 to selectively drive the pulsator 13 and the washing tub 12 in the water tub 11; And a variable means (30) radially provided on the outer circumferential surface of the water tub (11) for forcibly expanding and contracting the corrugated member (20) so that the center of gravity of the laundry and the position of the damper Shock absorber. The washing machine according to claim 1, wherein the variable means (30) comprises: a plurality of brackets (31) coupled to an outer circumferential surface of the water tub (11) and extending to a bottom surface of the water tub (11); A plurality of cylinders 32 provided at the lower ends of the brackets 31; And a piston rod (33) installed on each cylinder (32) and lifted by a pump (35) and having an upper end coupled to a bottom surface of the water tub (11).