KR100247649B1 - Damping apparatus of a washing machine - Google Patents

Abstract

The present invention relates to a dustproof device and a method of a washing machine, and in particular, a water tank hung in the main body with a plurality of suspension rods, a rotating tank installed inside the water tank and provided with stirring blades at the bottom thereof, and the rotating tank and the stirring vane are selected. A motor having a power switching device for driving the motor, the voltage generating means for generating a voltage by detecting the rotational speed of the motor, characterized in that it comprises a damper for controlling the flow of the fluid by applying the voltage generated by the voltage generating means As a result, when the rotating tub makes resonance rotation, the vibration is transmitted to the main body so that the noise during dehydration is reduced.

Description

Dustproof device and method of washing machine

1 is a schematic cross-sectional view of a conventional washing machine.

2 is a perspective view showing the resonant motion of the water tank and the rotating tank.

3a and b are conventional transmission curve diagrams.

Figure 4a, b, c is a characteristic diagram showing the force transmitted to the body up and down, left and right vibration conventional.

5 is an overall schematic view of the present invention.

6A is a cross-sectional view of the damper according to one embodiment of the present invention, and (b) is a cross-sectional view taken along the line A-A of FIG. 6A.

7 is a cross-sectional view showing the polarization phenomenon of the damper according to an embodiment of the present invention.

8a and b are diagrams showing voltage waveforms applied to the damper according to one embodiment of the present invention;

9a, b, and c are transfer rate curve diagrams of the present invention.

10a, b, c is a characteristic diagram showing the force transmitted to the upper and lower, left and right vibration and the main body of the present invention.

11 is a cross-sectional view of a damper according to another embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

1: body 10: tank

11: rotating tank 12: motor

20,20a: Damper 21,21a: Cylinder

23,23a: Piston 24,24a: Fluid passage

25: electric viscous fluid 25a: fluid

26: granule 27: insulation member

30: passage adjusting member 31: stopper

32: lifting rod 33: threaded portion

34: Spline 35: Bracket

36: drive shaft 36 ': spline

36 ": driven gear 37: control motor

38: pinion V: voltage generating means

MC: Microcomputer AM: Amplifier

The present invention relates to a dustproof device and a method of the washing machine, and more particularly, to reduce the amount of vibration due to the resonance generated during the initial driving of the rotating tub and the amount of the force transmitted to the main body during normal dehydration to reduce the noise The present invention relates to a dustproof device for washing machine and a method thereof.

Generally, the washing machine includes a water tank 10 suspended from a suspension rod 15 in a main body 1, a stirring blade 17 installed freely in a water tank 10, and a rotating tank as shown in FIG. 11), a power switching means 13 fixed to the bottom of the water tank 10 and selectively driving the stirring blade 17 and the rotating tank 11, and a motor 12 driving the power switching means 13; . On the other hand, the tube (14) with the liquid (W) is installed on the top of the rotating tub 11 to move in the opposite direction to the direction of the laundry when dewatering to minimize the vibration of the rotating tub.

The washing machine configured as described above typically puts the laundry (M) and water into the rotating tub (11) and then operates the motor (12). At this time, by operating the power switching means 13 performs the washing while the forward and reverse rotation of the stirring blade 17 of the inner bottom of the rotating tank (11). On the other hand, after the washing process, drain the water and perform dehydration. At this time, by operating the power switching means 12 to stop the drive of the stirring blades 17 and rotates the rotating tank 11 at high speed. The laundry M is dewatered by such a high speed rotation of the rotating tub 11.

On the other hand, as the laundry (M) is biased to one side by centrifugal force during dehydration, the rotating tank 11 vibrates. In this case, in order to reduce the vibration, a tube 14 having a liquid W embedded therein is provided at the top of the rotating tank 11. That is, when the rotating tub 11 rotates at a high speed, the laundry M is oriented to one side by centrifugal force. At this time, as the liquid (W) moves in the direction opposite to the centrifugal force of the laundry (M), the balance of the rotating tank is maintained to minimize vibration. Meanwhile, since the rotating tub 11 is suspended from the spring 16 at the lower end of the suspension rod 15, the vibration of the rotating tub is transmitted to the main body 1 through the suspension rod 15 at the bottom of the water tank 10. Is reduced.

However, when the rotating tank 11 rotates at the initial rotation of the rotating tank (when the centrifugal force is weak), that is, below the natural frequency (1-2 Hz) of the spring 16 at the bottom of the suspension rod 15, the laundry (M) and the liquid (W There is a problem that the vibration of the rotating tub is rather increased because it is in the same direction. This is a certain point P of the rotating tank 11 as shown in FIG. 2 swings in the direction of the arrow. More specifically, when the natural frequency of the rotating tank coincides with the rotational speed of the motor, the rotating tank vibrates severely, which is called a resonant motion in the resonant speed section.

3 is a transmission rate curve generated in the conventional dehydration. When the motor 12 reaches the rotational speed Rs which is the normal dehydration speed while increasing the rotation speed, the constant speed rotation is maintained. At this time, the rotational tank and the water tank make a resonant motion oscillating at a certain speed section, that is, between a point and b point. At this time, the up, down, left and right displacement at the specific point P in FIG. 2 becomes large as shown in FIGS. 4A and 4B, and when the rotation speed reaches point b, the displacement decreases. That is, as shown in FIG. 3 (b), it can be seen that the amount of vibration transmitted to the main body rapidly increases from point a to point b.

The present invention was developed to solve such a problem, and an object of the present invention is to provide an anti-vibration apparatus and method for washing machine which minimizes the amount of vibration transmitted to the main body by reducing the amount of resonance of the rotating tank during dehydration. .

In order to achieve the above object, the present invention includes a water tank hung in the main body with a suspension rod, a rotating tank installed inside the water tank and having a stirring blade at the bottom thereof, and a power switching device for selectively driving the rotating tank and the stirring blade. The motor is configured to include a voltage generating means for generating a voltage by sensing the rotational speed of the motor, and a damper for controlling the flow of the fluid by receiving the voltage generated by the voltage generating means.

The present invention also provides a low voltage control step for controlling the flow of the fluid filled in the damper by applying a low voltage to the damper by detecting the voltage generation means when the initial rotation of the motor when the rotating tank is driven by the motor, the resonance of the motor The high voltage control step of controlling the flow of the fluid filled in the damper by applying a high voltage to the damper by sensing the voltage during rotation, and the voltage generating means senses the voltage to the damper when the motor rotates normally It is configured to include a voltage-free control step to normalize the flow of the fluid filled in the damper by not applying a.

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

5 is a schematic cross-sectional view of the present invention, in which a washing machine is suspended by a suspension rod 15 on a main body 1, a water tank 10, a stirring vane 17 and a rotating water tank freely installed inside the water tank 10 ( 11), a power switching means 13 fixed to the bottom of the water tank 10 and selectively driving the stirring blade 17 and the rotating tank 11, and a motor 12 driving the power switching means 13; . In addition, a tube 14 having a liquid W embedded therein is formed at an upper end of the rotating tank 11 to maintain a balance with laundry when dewatering.

On the other hand, the voltage generating means (V) for detecting the rotation of the motor 12 to generate a voltage according to the number of revolutions, and the rotating tank (11) installed in the rotating tank 11 according to the voltage applied from the voltage generating means (V) 11) a damper 20 for damping the vibration transmitted to the. The damper 20 controls the flow of the fluid filled therein according to the initial rotation of the motor 12, the resonance rotation, the normal rotation, etc., so that the damping amount is adjusted. The present invention is to reduce the vibration generated during the resonance rotation in particular and to reduce the amount of vibration transmitted during normal dehydration.

In this case, the resonant rotation refers to a vibration of the rotating tub generated when the natural vibration of the rotating tub 11 and the rotational speed of the motor 12 coincide with each other. The laundry (M) and the liquid (w) Is rotated in the rotating tank 11 in a state that is in the same direction. That is, the state in which the rotating tank 11 vibrates to the maximum. On the other hand, during normal rotation, the centrifugal force of the laundry and the liquid act in the opposite direction to minimize the vibration of the rotating tub. Therefore, the damper of the present invention is not controlled in the flow of the fluid during the normal rotation.

In addition, the voltage generating means (V) is a microcomputer (MC) for detecting the number of revolutions of the motor 12 and outputs a control signal, the amplifier (AM) for amplifying the voltage in accordance with the output control signal applied to the damper 20 It is provided. That is, when the microcomputer MC detects the rotational speed of the motor 12 and outputs a control signal to the amplifier AM according to the rotational speed, the voltage is amplified by the amplifier AM and then applied to the damper 20. Actively control the flow of fluid.

FIG. 6A is a cross-sectional view of a damper according to an embodiment of the present invention, and FIG. 6B is a cross-sectional view taken along line A-A of FIG. 6A. Damper 20 is a cylinder 21, a cylinder (filled with an electric viscous fluid (ER fluid) 25 including a granule 26 made of a material such as silica and fixed to the bottom of the water tank 10, the cylinder ( A piston 23 having a fluid passage 24 installed therein and having a fluid 25 flowing therethrough, and having a lower end of the suspension rod 15 coupled through a boss 22 formed on an upper portion of the cylinder 21, and It is provided with a spring 28 which allows the piston 23 to be located in the inner center of the cylinder 21 when not washing and dehydrating. In addition, the suspension rod 15 and the piston 23 is to be coupled in a ball joint manner. In other words, a piston rod 23 'is formed at the upper center of the piston 23 to enter and exit the boss 22, and a ball support 23 "is formed at the upper end of the piston rod 23'. By forming a ball 15 'at the lower end, the piston rod 23' and the suspension rod 15 are bent freely by coupling to the ball support 23 ".

On the other hand, the insulating member 27 for polarizing the grains 26 by applying positive and negative voltages to both ends of the fluid passage 24, respectively. Polarization means that when positive and negative voltages are applied to both ends of the fluid passage 24 as shown in FIG. 7, particles 26 inside the fluid 25 are charged to narrow the passage 24. Thus, since the passage 24 is narrowed by the grains 26, the flow of the fluid 25 moving along the passage 24 is controlled less.

On the other hand, the insulating member 27 is to insulate the piston insulator 27 'and the boss 22 and the piston rod 23' to insulate the inner and outer periphery of the opposing inner and outer periphery of the fluid passage 24 facing each other Cylinder insulator 27 ". At this time, if a positive voltage is applied to the cylinder 21 and a negative voltage is applied to the piston rod 23 ', the piston insulator 27' is provided inside the piston insulator 27 '. A negative voltage is applied, and a positive voltage is applied to the outside because the inner periphery of the cylinder 21 and the outer periphery of the piston 23 are in contact with each other. A positive and negative voltage is applied to 24 to cause the grains 26 to be polarized.

The present invention configured as described above controls the flow of the fluid 25 inside the damper 20 by applying a voltage to the damper 20 by sensing the rotation speed of the motor 12.

When not washing and dehydrating, that is, when the washing machine is not used, the weight of the water tank 10 and the rotating tank 11 acts on the spring 28 of the damper 20 coupled with the suspension rod 15. In this case, if the elastic modulus of the spring 28 is designed such that the piston 23 is located in the middle of the cylinder 21, the piston 23 may be located in the middle of the cylinder 21. In this case, when the vibration is generated in the washing machine (vibration generated during transportation), the piston 23 moves up and down, and the fluid 25 enters and exits the fluid passage 24. 28). On the other hand, even when washing by driving the stirring blade 17, the vibration itself is also generated at this time the piston 23 flows up and down the inside of the cylinder 21 to alleviate the vibration and at the same time buffered by the spring 28 .

Meanwhile, when dewatering, the rotating force of the motor 12 is transmitted to the rotating tank 11 through the power switching device 13 so that the rotating tank is driven. At this time, when the motor 12 reaches the resonance speed, the microcomputer MC detects this and outputs a control signal to the amplifier AM. At this time, the voltage is amplified by the amplifier AM, and a positive voltage is applied to the cylinder 23 of the damper 20, and a negative voltage is applied to the piston 23, respectively. Therefore, the particles 26 are polarized at both ends of the fluid passage 24, so that the fluid passage 24 is narrowed. At this time, the flow of the fluid is slowed down and the damping amount of the piston 23 is reduced.

Hereinafter, the damper control method of the present invention will be described.

FIG. 8A is a diagram showing voltage waveforms applied to the damper according to an embodiment of the present invention. In the initial rotation of the motor 12, the microcomputer MC detects this and does not output a control signal to the amplifier AM. Do not. At this time, no voltage is applied to the damper 20 from the amplifier AM. That is, since the polarization of the grains 26 does not occur in the fluid passage 24 in the damper 20, the flow of the fluid is normal, which is called a low voltage control step.

On the other hand, when the resonant rotation of the motor 12 detects the microcomputer MC and outputs a control signal to the amplifier AM, the voltage is amplified by V2 in the amplifier AM and applied to the damper 20. At this time, a lot of polarization of the grains 26 are generated in the fluid passage 24 in the damper 20 to be controlled to slow the flow of the fluid, which is called a high voltage control step.

On the other hand, when the normal rotation of the motor 12 is detected by the microcomputer (MC) does not output a control signal to the amplifier (AM). At this time, no voltage is applied to the damper 20 from the amplifier AM. That is, since the particles 26 are not polarized in the fluid passage 24 of the damper 20, the flow of the fluid becomes normal. Therefore, the damping is caused by the flow of the fluid determined by the elastic modulus of the spring 28 and the diameter of the fluid passage 24, etc. This is called a no-voltage control step.

According to this control, the transfer rate characteristic as shown in Fig. 9B is shown. That is, when the initial rotation of the motor 12 forms a C ₁ curve which is a basic dustproof characteristic that will not apply voltage at the initial rotation, and the rotation speed reaches between a point and b point, the voltage is increased to V2 to form a curved shape of C ₂ with damping controlled. When normal rotation is reached, no voltage is applied to form the C ₁ curve, which is the basic dustproof characteristic. Accordingly, it can be seen that the up, down, left and right vibrations and the transmission force decrease as shown in FIGS. 10A, 10B, and 10C when the motor rotates resonantly.

In addition, the eighth degree (a) maintains the straight line or curve in the gradually rounded up to a point before the V2 the voltage at a ₂ point as indicated by the dotted line, and in the b ₂ point after point b is also the voltage in the form of a line or curve of You can also get off. At this time, the amount of resonance force of the rotating tub is reduced to the main body.

Meanwhile, referring to another control method of the present invention, as shown in FIG. 8B, the microcomputer MC detects the initial rotation of the motor 12 and outputs a control signal to the amplifier AM. At this time, the voltage of V1 is amplified in the amplifier AM and applied to the damper 20. Therefore, the polarization of the grains 26 in the fluid passage 24 in the damper 20 is controlled to slow the flow of the fluid, which is called a low voltage control step.

On the other hand, when the resonant rotation of the motor 12 is detected by the microcomputer (MC) and outputs a control signal to the amplifier (AM). At this time, the voltage of V2 is amplified in the amplifier AM and applied to the damper 20. Therefore, a lot of polarization of the grains 26 in the fluid passage 24 in the damper 20 is controlled to slow the flow of fluid, which is called a high voltage control step.

On the other hand, when the normal rotation of the motor 12 is detected by the microcomputer (MC) does not output a control signal to the amplifier (AM). At this time, since the particles 26 are not polarized in the fluid passage 24 of the damper 20, the flow of the fluid is normal. Therefore, the damping is caused by the flow of the fluid determined by the elastic modulus of the spring 28 and the diameter of the fluid passage 24, etc. This is called a no-voltage control step.

According to this control, the transfer rate characteristic as shown in Fig. 9C is shown. That is, when a constant voltage V1 is applied to the damper 20 during the initial rotation of the motor 12, the damping is large, and the C ₅ curve is formed. When the rotation speed reaches between the points a and b, the damping is increased by increasing the voltage to V2. A curve of C ₄ is formed, and when the normal rotation is reached, no voltage is applied to form a curve of C ₃ , which is a basic dustproof characteristic. Therefore, it can be seen that the vertical and horizontal vibrations and the transmission force decrease when the motor rotates resonantly.

11 is a cross-sectional view of a damper according to another embodiment of the present invention, in which a plurality of dampers 20a are coupled to the outer periphery of the water tank 10 and filled with a pure fluid 25a containing no particles therein. 21a, a piston 23 'installed inside each cylinder 21a, coupled to each suspension rod 15, and having a plurality of fluid passages 24a, and applied from the voltage generating means V of FIG. The passage adjusting member 30 which opens and closes the fluid passage 24a by raising and lowering the stopper 31 installed in the fluid passage 24a according to the voltage. At this time, the fluid passage 24a has a tapered shape that narrows toward the upper portion, and the stopper 31 also has a tapered shape so as to correspond to the fluid passage 24a. In addition, the suspension rod 15 and the piston (23a) is to be coupled in a ball joint manner. In other words, a piston rod 23a 'is formed in the upper center of the piston 23a to enter and exit the boss 22a, and a ball holder 23a "is formed at the upper end of the piston rod 23a'. By forming a ball 15 'at the lower end, the piston rod 23a' and the suspension rod 15 are bent freely by coupling to the ball support 23a ".

According to another embodiment of the present invention, when the microcomputer MC, which is the voltage generating means V, outputs a control signal to the amplifier AM according to the rotation speed of the motor 12, the amplifier AM amplifies the voltage. It is applied to the adjustment member (30). At this time, the stopper 31 of the passage adjusting member 30 is moved up and down along the fluid passage 24 'to control the flow of the fluid 25' by narrowly or broadly adjusting the passage 24 '.

The passage adjusting member 30 is fixed to the elevating rod 32 having the screw portion 33 and the spline portion 34 at the lower portion of the stopper 31 and the lower portion of the piston 23a near the fluid passage 24a, and the screw portion 33 ), And a spline 36 'coupled to the spline portion 34 is formed on the inner side thereof, and a lower gear is driven to the pinion 38 driven by the control motor 37. Is provided with a drive shaft 36 and a bearing 39 which is coupled to the lower portion of the cylinder 21a to limit the lifting of the drive shaft 36 and to allow rotation.

The damper 20a according to another embodiment of the present invention configured as described above controls the voltage amplified by the amplifier AM when the microcomputer MC detects the rotation speed of the motor 12 and outputs a control signal to the amplifier AM. It is applied to the motor 37. If it is assumed that the stopper 31 is located in the middle of the fluid passage (24a) is a neutral, when the motor 12 is at the resonant speed, the control motor 37 is driven so that the stopper 31 rises and the normal speed Drives the control motor 37 to be in a neutral position.

On the other hand, when the stopper 31 is controlled, the stopper 31 and the piston 23a are raised and lowered in the cylinder 21a according to the vibration of the rotating tub 11 while maintaining the adjustment position thereof. That is, when the forward and reverse rotation of the control motor 37 is transmitted to the drive shaft 36 through the pinion 38 and the driven gear 36 ", the lifting rod 32 is connected to the elevating rod 32 through the spline 34 coupled with the spline 36 '. At this time, the drive shaft 36 rotates without being lifted by the bearing 39. The lifting rod 32 is lifted along the thread by the threaded portion 33 screwed with the bracket 35. On the other hand, when the elevating adjustment is completed, the elevating rod 32 does not change the elevating position unless the control motor 37 is driven, so that the gap between the top end cap 31 and the fluid passage 24 'is maintained. do.

Therefore, when the rotating tank 11 and the water tank 10 vibrate, the inside of the cylinder 21a is elevated by the piston 23a and the stopper 31 being integrated. At this time, the fluid 25a is damped because the upper and lower portions of the piston 23a enter and exit along the fluid passage 24a controlled by the stopper 31. On the other hand, because the spline is a rotational force is transmitted in a state capable of flowing in the axial direction, the lifting bar 32 can be raised and lowered inside the drive shaft 36 during damping.

As described above, according to the present invention, when the rotating tub makes resonance rotation, the vibration is less transmitted to the main body, thereby reducing the noise during dehydration.

Claims (3)

A water tank (10) hung in the main body (1) with a plurality of suspension rods (15), a damper (20) fixed to the water tank (10) and coupled to an end of the suspension rods (15), and the water tank (10). A motor having a rotating tank 11 installed therein and having a stirring blade 17 at the bottom thereof so as to be rotatable, and a power switching device 13 for selectively driving the rotating tank 11 and the stirring blade 17. In the washing machine provided with (12), the damper (20) is installed to partition the cylinder 21 fixed to the lower end of the water tank (10), the cylinder 21 up and down and at the same time the suspension rod (15) Piston 23 having a fluid passage 24 coupled to an end of the piston and an electrical viscosity filled in the cylinder 21 to enable flow through the fluid passage 24 of the piston 23. And a voltage generating means (V) for generating a voltage by sensing the rotational speed of the motor 12, including the fluid 25, and the voltage The living means V applies a voltage to the piston 23 so that the viscosity of the electric viscous fluid 25 is changed when the rotation speed of the motor 12 coincides with the natural frequency of the rotating tank 11 during the dehydration stroke. Dustproof apparatus of the washing machine characterized by including the microcomputer (MC) to apply. 2. The piston (23) according to claim 1, wherein the piston (23) is provided with an insulating member (27 ') for applying a positive voltage and a negative voltage to both ends of each of the fluid passages (24) to polarize the electric viscous fluid (25). Dustproof device of the washing machine characterized in that. A water tank 10 suspended from the main body 1 by a suspension rod 15, a damper 20 fixed to the water tank 10, and coupled to an end of the suspension rod 15, and in the water tank 10. A rotating tank 11 rotatably installed and having a stirring blade 17 at a bottom thereof, and a motor 12 having a power switching device 13 to selectively drive the rotating tank 11 and the stirring blade 17. And a damper 20 coupled to an end of the suspension rod 15 while being installed to partition the cylinder 21 fixed to the bottom of the water tank 10 up and down. And a piston 23 having a fluid passage 24 and an electrically viscous fluid 25 filled in the cylinder 21 to enable flow through the fluid passage 24 of the piston 23. In the washing machine provided with a voltage generating means (V) for generating a voltage by sensing the rotational speed of the motor 12, the rotating tank 11 to the motor 12 When driving, the voltage generating means (V) detects the initial rotation of the motor 12 and applies a low voltage to the piston 23, thereby flowing the electric viscous fluid 25 through the fluid passage 24. Low voltage control step of slowing down, when the resonant rotation of the motor 12 is detected by the voltage generating means (V) and applies a high voltage to the piston 23 by the electric viscous fluid 25 through the fluid passage (24) The high voltage control step of relatively slowing the flow of the fluid, and the voltage generating means (V) when the normal rotation of the motor 12 detects this does not apply a voltage to the piston (23) by opening the fluid passage (24) Dustproof method of the washing machine characterized in that it comprises a voltage-free control step to normalize the flow of the electrical viscous fluid (25) through.