KR101205490B1 - Suspension damper having magneto rheological fluid type for washing machine - Google Patents

Abstract

The present invention relates to a damper for reducing vibration and noise generated in a laundry container during washing and dehydration of a washing machine. More particularly, the magneto-reologicla fluid is applied to a rod of a damper to vibrate vibration and noise. A magnetorheological fluid suspension damper for a washing machine can be reduced.
Accordingly, the present invention is supported by a cylinder 2 having a shaft 1 fixed to one end and a spring 5 disposed between the spring seat 3 and the cap 4 at the other end of the cylinder 2. In the suspension damper for a washing machine comprising a rod (9) in which the bearing (8) of the damper portion (7) contacts with the oil seal (6) inside the cylinder (2), the damper portion (7) is a cylinder The first yoke 10a and the second yoke 10b and the first yoke 10 which are spaced apart between the connecting cap 1a of the shaft 1 and the cap 4 of the cylinder 2 at the inner diameter of (2). The first solenoid 911a and the second solenoid 11b mounted between 10a and the second yoke 10b and the moving space 12 of the rod 9 are in contact with the outer diameter of the rod 9. The first solenoid 11a and the second solenoid (between the inner diameter of the first yoke 10a and the second yoke 10b and the gap 13 between the inner diameters of the first solenoid 11a and the second solenoid 11b are in contact with each other. Of 10b) A magnetorheological fluid 14 which acts upon application of a magnetic field is built in, and the magnetorheological fluid 14 is in close contact with the oil seal 6 and the packing 6a to have a leak-proof structure.

Description

Suspension damper having magneto rheological fluid type for washing machine

The present invention relates to a damper for reducing vibration and noise generated in a laundry container during washing and dehydration of a washing machine. More particularly, the magneto-reologicla fluid is applied to a rod of a damper to vibrate vibration and noise. A magnetorheological fluid suspension damper for a washing machine can be reduced.

The washing machine is supported by the main body in a three- or two-point support system for washing and dewatering laundry by rotating the laundry, and a plurality of suspension dampers are installed to absorb vibrations and shocks generated when the laundry is rotated.

The suspension damper holding the laundry tub not only absorbs the vibration, shock and noise of the rotating laundry tub during washing and dehydration, but also provides a holding force to the laundry tub to provide a separate suspension support. It is not necessary.

Conventionally, dampers have been installed to reduce noise and vibration when the washing machine is operating.However, the washing machine does not effectively attenuate the vibration and noise generated when the laundry in the laundry box is pulled to one side, causing noise between floors of the apartment due to late night washing machine operation. And, there was a problem that the noise and vibration instability caused by excessive shaking when washing the laundry like a large blanket still remains.

Meanwhile, among such dampers for washing machines, dampers for washing machines, such as Korean Utility Model Registration No. 410,220 and Utility Model Registration No. 383,889 and Utility Model Registration No. 372,686, registered by the present applicant, maintain a constant damper force and reduce vibration. The dampers, or the damping force against vibration and noise generation, need to be improved as described above.

Therefore, the present invention was invented in view of the conventional problems as described above, while the vibration and noise reduction is remarkably made as compared with the conventional damper for washing machine, while ensuring the stability of the washing machine during washing and dehydration, up and down impact, and quick response with quick response. It is an object of the present invention to provide a magnetorheological fluid suspension damper for a washing machine capable of reducing absorption.

The present invention for achieving the above object is a cylinder that is fixed to the shaft end, and the other end of the cylinder is burnt with a spring disposed between the spring seat and the cap and sealed through the oil seal inside the cylinder damper portion A suspension damper for a washing machine having a rod in contact with a bearing, wherein the damper portion is disposed between the connecting cap of the shaft and the cap of the cylinder at an inner diameter of the cylinder, and the first yoke and the second yoke, respectively. The first solenoid and the second solenoid mounted between the yoke and the gap between the inner diameter of the first yoke and the second yoke and the inner diameter of the first solenoid and the second solenoid while contacting the outer diameter of the rod in the moving space portion of the rod. Magnetorheological fluid is built in between.

The magnetorheological fluid type suspension damper for a washing machine according to the present invention as described above is suppressed by the vibration of the washing machine while reducing the vibration, shock and noise of the washing machine with a quick response by the damper part to which the magnetorheological fluid is applied when the washing machine is operated. It also has the function and effect to ensure the stability of the washing machine when washing.

1 is an external perspective view of a magnetorheological fluid suspension damper for a washing machine according to the present invention;
Fig. 2 is a sectional view of Fig. 1,
FIG. 3 is a graph showing rotation RPM (revolution per minute) with respect to shear force generated in a washing machine of a washing machine, and is a graph of comparison between a magnetorheological fluid damper force and a high and low damper force of the present invention. .

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

As shown in Figure 1 and 2, the present invention is a suspension damper is installed between the washing tub and the main body of a known washing machine to reduce vibration, shock and noise during the rotation operation of the washing machine, the shaft (1) is fixed to one end And a spring (5) disposed between the spring seat (3) and the cap (4) at the other end of the cylinder (2) and sealed with an oil seal (6) inside the cylinder (2). Suspension damper for a washing machine comprising a rod (9) in which the bearing (8) of the damper portion (7) is in contact with the damper portion (7), wherein the damper portion (7) is a connecting cap of the shaft (1) at the inner diameter of the cylinder (2). Between the first yoke 10a and the second yoke 10b and the first yoke 10a and the second yoke 10a, 10b, which are spaced apart between the 1a and the cap 4 of the cylinder 2. The first solenoid 11a and the second solenoid 11b to be mounted, and the first yaw in contact with the outer diameter of the rod 9 in the moving space portion 12 of the rod 9 Of the first solenoid 10a and the second solenoids 10b between the inner diameter of the second yoke 10b and the gap 13 between the inner diameters of the first solenoid 11a and the second solenoid 11b. The magnetorheological fluid 14 acting according to the magnetic field is sealed by the oil seal 6 and the packing 6a, and has a built-in structure to prevent leakage.

Here, in the damper part 7, the first and second yokes 10a and 10b and the cap 4 are provided with a plurality of packings 6a to allow the magnetorheological fluid 14 to flow between the gaps between the respective parts. While preventing, the connecting portion of the cap 4, which is the end of the cylinder 2, is not only to prevent leakage of the magnetorheological fluid 14 even when a tolerance occurs between the parts by the pipe rolling 17, Since all the parts surrounding the magnetorheological fluid 14 are in close contact, leakage of the magnetorheological fluid 14 is prevented.
That is, the magnetorheological fluid 14 is attached to the picking 6a disposed in the first yoke 10a and the second yoke 10b and the oil seal 6 inside the cap 4. Leakage is prevented.

The cylinder 2 is formed with a wire lead wire hole 16 for connecting the electric wire 15 to the first solenoid 11a and the second solenoid 11b, and the bearing 8 includes a bearing cylinder 2. Is held by the cap (4).

Meanwhile, the magnetorheological fluid 14 applied to the present invention is a fluid made by dispersing the magnetron particles of macron size in a mineral O-ring or a silicone oil medium, which is known in the art. It is a fluid that forms and hardens into a solid state.

The bearing 8, which is in contact with the rod 9, is made of a steel bearing. When the magnetic field is formed by the first solenoid 11a and the second solenoid 11b, the magnetic field is also applied to the inner diameter of the bearing 8; This is formed to help change the viscosity of the magnetorheological fluid (14).

Meanwhile, in the damper according to the present invention, the damper force is strengthened because the magnetic field increases as the rod 9 enters the inside of the moving space 12 of the cylinder 2, which is the first solenoid 11a and the second solenoid. (11b) because the damper force increases from the first yoke 10a and the second yoke 10b between the middle, and the position of the rod 9 is of course determined by the weight of the laundry. In the structure of the washing machine, the more the laundry, the damper force is strengthened, and the less the laundry, the damper force is weaker.

Next, the operation of the present invention will be described.

In general, the washing machine requires a high damper force in the period A ~ C in the initial over-vibration as shown in the graph of Figure 3 and a low damper force at normal RPM.

As shown in the graph of Figure 3, the high damper force is low vibration in the A ~ C section but high vibration occurs in the normal RPM, the low damper force is high vibration in the A ~ C section but low in the normal RPM Vibration occurs.

However, when the damper 7 to which the magnetorheological fluid 14 applied to the present invention is applied, the damper force can be adjusted by applying and blocking the input voltage through the wire 15.

Accordingly, the high damper force is given in the A ~ C section, and the low damper force can be adjusted at the normal RPM, so that the vibration, shock and noise of the washing machine can be properly controlled and reduced during washing to always maintain low vibration.

That is, the damper part 7 of the present invention applies power to the first solenoid 11a and the second solenoid 11b during the initial process of driving the washing machine, and the magnetic field changes the viscosity of the magnetorheological fluid 14 so that the rod 9 The damper force is constrained by constraining the outer diameter, and at normal RPM, the power supply of the first solenoid 11a and the second solenoid 11b is cut off to maintain the magnetorheological fluid 14 in a fluid state. The damper force is reduced by reciprocating in the moving space part 12 of the cylinder 2 along the arrow (a) direction of FIG.

As described above, the present invention uses a damper using the magnetorheological fluid 14 to rapidly change the damper force by applying the power of the solenoid, thereby rapidly responding to the vibration and noise generated from the shaft and the rod. Can be absorbed and dispersed.

1 axis, 2 cylinders,
3: spring seat, 4: cap,
5: spring, 6: oil seal,
6a: packing,
7: damper portion, 8: bearing,
9: rod, 10a, 10b: yoke,
11a, 11b: solenoid, 12: moving space part,
13: niche,
14: magneto Rheological Fluid,
15: wires,
16: lead wire hole,
17: rolling pipe.

Claims (3)

The cylinder 2 is fixed to one end of the shaft 2, and the other end of the cylinder 2 is supported by a spring 5 disposed between the spring seat 3 and the cap 4 and the cylinder 2 In the suspension damper for a washing machine comprising a rod (9) in which the bearing (8) of the damper portion (7) is contacted while being sealed with an oil seal (6),
The damper portion 7 has a first yoke 10a and a second yoke, which are spaced apart between the connecting cap 1a of the shaft 1 and the cap 4 of the cylinder 2 at the inner diameter of the cylinder 2. 10b), the first solenoid 11a and the second solenoid 11b mounted between the first yoke 10a and the second yoke 10b, and in the moving space portion 12 of the rod 9 The first gap between the gap 13 between the inner diameter of the first yoke 10a and the second yoke 10b and the inner diameter of the first solenoid 11a and the second solenoid 11b while contacting the outer diameter of the rod 9. Washing machine, characterized in that the magnetorheological fluid (14) acting according to the magnetic field of the solenoid (11a) and the second solenoid (11b) is sealed by the oil seal (6) and the packing (6a) to prevent leakage Magnetorheological fluid suspension dampers. The method of claim 1,
The bearing (8) in contact with the rod (9) is a magnetorheological fluid suspension damper for a washing machine, characterized in that the steel bearing. delete

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