JP2012000277A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of resonance of a water tank during deceleration from high-speed rotation of a rotary tub such that a washing machine can be used with less vibration.SOLUTION: A suspension for elastically supporting a water tank including a drum (rotary tub) driven to rotate during dewatering operation has a damper for damping vibration of the water tank, and this damper can vary damping force. The damping force is made large in an area passing a resonance frequency (R) of the water tank during deceleration of the drum from high-speed rotation. With this structure, occurrence of resonance of the water tank during deceleration of the drum from high-speed rotation is prevented and the washing machine can be used with less vibration, so problems such as crashing of the water tank against an outer housing 1 or displacement of the entire washing machine are not caused during use of the washing machine.

Description

  Embodiments described herein relate generally to a washing machine.

  Conventionally, in a washing machine, especially a drum type washing machine, a water tank is located inside the outer box, and a drum that is a rotating tub is located inside the water tank, and this drum is driven to rotate by a motor outside the water tank. It has come to be. The water tank is elastically supported by a suspension on the bottom plate of the outer box, and a damper for attenuating vibration of the water tank accompanying the vibration of the drum is provided on the suspension. As this type of damper, one using a functional fluid as a working fluid is known.

  A functional fluid is a fluid whose rheological properties such as viscosity are functionally changed by controlling physical quantities applied from the outside, and is a magnetorheological fluid and an electric fluid that change in viscosity when electric energy is applied. Includes viscous fluids. Among them, the magnetorheological fluid is, for example, a dispersion of ferromagnetic particles such as iron and carbonyl iron in oil, and when a magnetic field is applied, the ferromagnetic particles form chain clusters. The viscosity increases, and the viscosity of an electrorheological fluid increases when an electric field is applied.

JP 2006-295906 A

  The above-described damper using a functional fluid as the working fluid can change the damping force by changing the viscosity of the functional fluid. Increase the damping force to avoid the resonance of the aquarium, and during the subsequent dehydration process, reduce the damping force to avoid the vibration of the aquarium from being transmitted to the outer box. It is possible to avoid being transmitted to the floor of the installed house.

  However, the water tank resonance appears at the same rotational speed range as the water tank resonance at the start-up, even during deceleration from the high-speed rotation of the drum at the end of the dehydration process. Vibrates greatly, causing problems such as a water tank colliding with the outer box or the entire washing machine moving. In particular, such a problem becomes prominent when there is an imbalance of laundry in the drum.

  Accordingly, a washing machine that can be used with less vibration by avoiding the occurrence of resonance of the water tank during deceleration from high-speed rotation of the rotating tank is provided.

  The washing machine of the present embodiment includes an outer box, a water tank located inside the outer box, a rotating tub located inside the water tank and driven to rotate, and the water tank elastically supported inside the outer box. And a suspension having a damper that attenuates the vibration of the water tank, and the damper is capable of changing the damping force, and the damping force is reduced during deceleration from the high-speed rotation of the rotating tank. It is characterized in that it is increased in the region passing through the resonance frequency of the water tank.

Time chart showing the first embodiment Longitudinal side view of the entire washing machine with a part broken away Longitudinal cross section of suspension unit Electrical configuration block diagram FIG. 1 equivalent diagram showing the second embodiment FIG. 1 equivalent view showing the third embodiment FIG. 1 equivalent view showing the fourth embodiment

The first embodiment will be described below with reference to FIGS.
First, FIG. 2 shows the overall structure of a washing machine, particularly a drum-type washing machine, and an outer box 1 is used as an outer shell. A laundry entry / exit 2 is formed at the center of the front surface of the outer box 1 (right side in FIG. 2). A door 3 for opening and closing the laundry entry / exit 2 is pivotally supported on the outer box 1. Provided. In addition, an operation panel 4 is provided at the upper part of the front surface of the outer box 1, and a control device 5 for operation control is provided on the back side (inside the outer box 1).

A water tank 6 is disposed inside the outer box 1. This water tank 6 has a horizontal cylindrical shape whose axial direction is front and rear (right and left in FIG. 2), which is placed on the bottom plate 1a of the outer box 1 by a pair of left and right suspensions 7 (only one is shown in FIG. 2). It is elastically supported in the form of an upward slope. The detailed structure of the suspension 7 will be described later.
A motor 8 is attached to the back of the water tank 6. In this case, the motor 8 is composed of, for example, a direct current brushless motor, and is an outer rotor type. A rotating shaft (not shown) attached to the center of the rotor 8 a is connected to the inside of the water tank 6 via the bearing housing 9. Is inserted.

  A drum 10 is disposed inside the water tank 6. This drum 10 also has a horizontal cylindrical shape in which the axial direction is front and rear, and by attaching it to the tip of the rotating shaft of the motor 8 at the center of the rear part, the drum 10 is concentric with the water tank 6 and rises forward. I support it. As a result, the drum 10 is rotated by the motor 8, so that the drum 10 is a rotating tank, and the motor 8 functions as a rotating tank driving motor that rotates the drum 10. .

  A large number of small holes 11 are formed in the circumferential side portion (body portion) of the drum 10 over the entire area. The drum 10 and the water tub 6 both have openings 12 and 13 on the front surface, and the opening 13 of the water tub 6 and the laundry entrance / exit 2 are connected by an annular bellows 14. . As a result, the laundry entrance / exit 2 is connected to the inside of the drum 10 via the bellows 14, the opening 13 of the water tub 6, and the opening 12 of the drum 10.

  A drain pipe 16 is connected to the rear part of the bottom, which is the lowest part of the water tank 6, via a drain valve 15. A drying unit 17 is disposed above and in front of the back of the water tank 6. This drying unit 17 has a dehumidifier 18, a blower 19, and a heater 20, and dehumidifies the air in the water tank 6, and then heats the air to return it to the water tank 6. The laundry is to be dried.

  Here, the detailed structure of the suspension 7 will be described. The suspension 7 includes a shaft 22 attached to an attachment plate 21 included in the bottom plate 1 a of the outer box 1 and a cylinder 24 attached to an attachment plate 23 included in the water tank 6. Specifically, a connecting portion 22a shown in FIG. 3 is provided at the lower end portion of the shaft 22, and as shown in FIG. 2, a cushion 25 such as rubber is attached to the mounting plate 21 of the bottom plate 1a. The shaft 22 is attached to the attachment plate 21 by being fastened with a nut 26.

  On the other hand, a connecting member 27 shown in FIG. 3 is provided at the upper end portion of the cylinder 24. As shown in FIG. 2, the connecting member 27 is attached to the mounting plate 23 of the water tank 6 via a cushion 28 and the like. The cylinder 24 is configured so as to vibrate in the vertical direction (axial direction) together with the water tub 6.

  As shown in detail in FIG. 3, the cylinder 24 is composed of a double cylinder having an outer cylinder 24a and an inner cylinder 24b, and the upper ends of both the cylinders 24a and 24b are connected to the outer end lid 30 and the inner end lid. The lower end is closed by an outer sleeve 32 and an inner sleeve 33. The inner cylinder 24b of the cylinder 24 is filled with a functional fluid, in this case, a magnetorheological fluid (MR fluid) 34.

  As described above, the functional fluid is a fluid whose rheological properties such as viscosity are functionally changed by controlling the physical quantity applied from the outside, and is a fluid whose viscosity changes by application of electrical energy. The magnetorheological fluid 34 and the electrorheological fluid (not shown) are included. In the present embodiment, the magnetorheological fluid 34 whose viscosity characteristics change according to the strength of the magnetic field (magnetic field) is used. However, the electrorheological fluid (ER fluid) whose viscosity characteristics change according to the strength of the electric field (electric field). May be used. The magnetorheological fluid 34 is, for example, one in which ferromagnetic particles such as iron and carbonyl iron are dispersed in oil, and when a magnetic field is applied, the ferromagnetic particles form a chain cluster to reduce the viscosity. It will rise.

A piston valve 35 is also accommodated in the inner cylinder 24b of the cylinder 24. The piston valve 35 has a short cylindrical shape and is fixed to the upper end portion of the shaft 22. The outer peripheral surface is in close contact with the inner peripheral surface of the inner cylinder 24b so as to be able to reciprocate vertically. A plurality of orifice holes 36 penetrating in the axial direction are formed near the outer peripheral surface of the piston valve 35, and a coil 37 for generating the magnetic field (magnetic field) is attached to the center side of the orifice hole 36. Yes.
The lead wire 37a of the coil 37 is connected to an external drive circuit (not shown) through the center hole 38 of the shaft 22. Further, the center hole 38 of the shaft 22 is tightly closed by the seal member 39 at the upper end portion of the shaft 22.

Further, the shaft 22 has a portion below the upper end to which the piston valve 35 is fixed, penetrates the inner sleeve 33, the outer sleeve 32, and the seal member 40 of the cylinder 24, and projects downward from the cylinder 24. Thus, the damper 41 is configured.
A spring seat 42 is fixed to the lower portion of the shaft 22 of the damper 41, and a coil spring 43 is telescopically interposed between the spring seat 42 and the outer sleeve 32. The water tank 6 is elastically supported by the suspension 7.

  In the suspension 7 as described above, when the water tank 6 vibrates in the vertical direction, the cylinder 24 of the damper 41 reciprocates up and down in the axial direction together with the expansion and contraction of the coil spring 43. At this time, the piston valve 35 reciprocates up and down relatively in the magnetorheological fluid 34 in the cylinder 24, so that the magnetorheological fluid 34 passes through the orifice hole 36 of the piston valve 35. At this time, a damping force is generated in the suspension 7 due to the viscosity of the magnetorheological fluid 34, and the amplitude of the water tank 6 is attenuated.

At that time, if a magnetic field is applied to the magnetorheological fluid 34 by energizing the coil 37, the viscosity of the magnetorheological fluid 34 increases. Thereby, since the friction loss when the magnetorheological fluid 34 passes through the orifice hole 36 increases, the damping force increases. That is, in the suspension 7, the damping force can be changed by energizing the coil 37, and the magnetorheological fluid 34 and the coil 37 constitute a damping force variable mechanism 44 that changes the damping force. ing. In this case, the variable damping force mechanism 44 includes a coil 37 as a magnetic field generating device that generates a magnetic field, and the damping force is changed by changing the magnetic field.
In the case where the damping force variable mechanism 44 changes the damping force by changing the electric field (electric field), it has an electric field generator that generates an electric field.

  FIG. 4 is a block diagram showing an electrical configuration centering on the control device 5. The control device 5 is composed of, for example, a microcomputer and functions as a control means for controlling the overall operation of the drum type washing machine. The control device 5 includes various operations that the operation panel 4 has. Various operation signals are input from an operation input unit 45 including a switch.

  In addition, the control device 5 receives a water level detection signal from a water level sensor 46 provided to detect the water level in the water tank 6 and from a rotation sensor 47 provided to detect the rotation of the motor 8. A rotation detection signal is input, and vibration detection signals are input from vibration sensors 48 and 49 which are vibration detection means provided to detect the vibration of the water tank 6.

The rotation sensor 47 uses, for example, a Hall element. As shown in FIG. 2, the rotation sensor 47 is provided inside the motor 8 and detects the rotation of the motor 8 by detecting the rotation of the rotor 8a. ing. Further, the control device 5 calculates the number of revolutions of the motor 8 and thus the number of revolutions of the drum 10 by the required detection time based on the rotation detection signal from the rotation sensor 47, thereby the drum 10. It also functions as a rotational speed detecting means for detecting the rotational speed of the motor.
In this case, the vibration sensors 48 and 49 are composed of acceleration sensors, and are arranged in a front portion and a rear portion of the outer lower portion of the water tank 6 as shown in FIG.

  And the control apparatus 5 is based on those inputs, a detection result, and the control program memorize | stored previously, the water supply valve 50 provided so that it may supply in the said water tank 6, the motor 8, the said drain valve 15, and the said drying In the unit 17, the motor 19 b (see FIG. 2) that drives the blower blades 19 a (see FIG. 2) of the blower 19, the heater 20 a (see FIG. 2) of the heater 20 in the drying unit 17, and the damper 41 of the suspension 7 A drive control signal is given to a drive circuit 51 that drives the coil 37.

Next, the operation of the above configuration will be described.
In the above configuration, when a standard driving course is started based on the operation of the operation panel 4, a washing (washing and rinsing) operation is started first. In this washing operation, the operation of supplying water into the water tub 6 is performed by the water supply valve 50, and then the motor 8 is operated, whereby the drum 10 containing the laundry is alternately rotated in both forward and reverse directions at low speed. The

When the washing operation is completed, the dehydration operation is then started. Details of the dehydration operation will be described later.
When the dehydration operation is completed, a drying operation is next performed. In this drying operation, the drying unit 17 is caused to function while rotating the drum 10 in both forward and reverse directions at low speed, and the air in the water tank 6 is circulated through the dehumidifier 18, the blower 19, and the heater 20 in this order.

Now, the dehydration operation is as shown in FIG. That is, the drum 10 is rotated in one direction, and the rotation speed is changed as indicated by R. In particular, as shown in the R ₁ part, the rotation speed of the drum 10 is increased to, for example, 55 to 60 [rpm] before and after the laundry sticks to the inner peripheral portion of the drum 10, and then the heel is lowered. After that, the rotational speed of the drum 10 is increased. As a result, the laundry is evenly dispersed in the inner peripheral portion of the drum 10.

The subsequent increase in the rotational speed of the drum 10 is stepwise, and when the rotational speed is increased (accelerated), the drum 10 passes the resonance frequency of the water tank 6 as indicated by the R ₂ portion. The region including the portion that passes through the resonance frequency of the water tank 6 is, for example, up to 300 [rpm]. During that time, the water tank 6 vibrates, and particularly, when the water tank 6 passes the resonance frequency, the water tank 6 vibrates greatly. It is normal. The resonance frequency of the water tank 6 is in the rotational speed range of the drum 10 such as 200 to 250 [rpm] for the vertical vibration of the water tank 6, and 150 to 200 [rpm] of the drum 10 for the front and rear, left and right vibrations. It has been confirmed by experiment that it is in the rotational speed range of

  On the other hand, in the above configuration, the coil 37 in the damper 41 of the suspension 7 is energized (ON) as shown in FIG. 1B in the region including the portion that passes the resonance frequency of the water tank 6. . When the coil 37 is energized, the damper 41 applies a magnetic field to the magnetorheological fluid 34 as described above, thereby increasing the viscosity of the magnetorheological fluid 34, thereby causing the magnetorheological fluid to pass through the orifice hole 36. Since the friction loss when 34 passes increases, the damping force of the damper 41 increases. Thus, the vibration of the water tank 6 is suppressed, and the occurrence of problems such as the collision of the water tank 6 with the outer box 1 or the movement of the entire washing machine can be avoided.

It should be noted that while the rotational speed of the drum 10 is increased stepwise, at each stage (R ₃ portion) at a constant speed, the water discharged from the laundry is smoothly discharged while avoiding excessive accumulation in the water tank 6. “Draining” is performed.

  Thereafter, the rotational speed of the drum 10 passes the above 300 [rpm] and reaches the high speed dewatering region. In the deceleration region after a predetermined time, the coil 37 in the damper 41 of the suspension 7 is energized until 300 [rpm]. Stop (OFF). Accordingly, during this time, the damping force of the damper 41 has a magnitude that can be obtained by the natural viscosity of the magnetorheological fluid 34, thereby avoiding the vibration of the water tank 6 from being transmitted to the outer case 1 and further installing the washing machine. Try to avoid getting to the floor of the house.

Even during the deceleration after 300 [rpm], the rotational speed of the drum 10 passes the resonance frequency of the water tank 6 as indicated by the R ₄ portion.
On the other hand, in the above configuration, the coil 37 in the damper 41 of the suspension 7 is energized (ON) even in the region including the portion that passes through the resonance frequency of the water tank 6 when the rotational speed of the drum 10 is reduced. . As a result, as described above, a magnetic field is applied to the magnetorheological fluid 34, the viscosity of the magnetorheological fluid 34 is increased, the damping force of the damper 41 is increased, and the vibration of the water tank 6 is suppressed.

  As described above, in the above configuration, the suspension 7 that elastically supports the water tank 6 having the drum 10 that is rotationally driven during the dehydrating operation includes the damper 41 that attenuates the vibration of the water tank 6, and the damper 41 is attenuated. The force can be changed, and the damping force is increased in a region that passes through the resonance frequency of the water tank 6 during deceleration from the high-speed rotation of the drum 10. This avoids the occurrence of resonance of the water tank 6 during deceleration from the high-speed rotation of the drum 10 and can be used with less vibration, so that the water tank 6 collides with the outer case 1 or the entire washing machine moves. It can be used without causing such problems.

  5 to 7 show the second to fourth embodiments. The same parts as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Only the part is described.

[Second Embodiment]
In the second embodiment shown in FIG. 5, the damping force of the damper 41 is increased in the region passing through the resonance frequency of the water tank 6 during the deceleration from the high-speed rotation of the drum 10 described above. This is executed based on the detection result of the rotation speed detection means comprising the rotation sensor 47 and the control device 5.

Specifically, when the rotational speed of the drum 10 reaches the R ₄ portions described above passing through the resonance frequency of the water tank 6, the coil 37 of the damper 41 is energized (ON) when detected by the rotational speed detecting means. ) As a result, a magnetic field is applied to each of the magnetorheological fluids 34 in the region where the resonance frequency of the water tank 6 passes, and the viscosity of the magnetorheological fluid 34 is increased to increase the damping force of the damper 41. In this case, not only during the deceleration of the drum 10 but also during the acceleration, the rotation speed detection means detects that each R ₂ portion passing through the resonance frequency of the water tank 6 is reached. The coil 37 of the damper 41 is energized (ON).

  The resonance frequency of the aquarium 6 is determined by the vibration system in the structure of the washing machine, such as the spring constant of the suspension 7 and the lateral vibration dimension. By grasping the rotational speed of the drum 10, the aquarium 6 undergoes resonance vibration. It is possible to determine whether or not Therefore, as in this embodiment, increasing the damping force of the damper 41 in the region that passes through the resonance frequency of the water tank 6 is the detection result of the rotation speed detection means that includes the rotation sensor 47 and the control device 5. By performing based on this, the resonance vibration of the water tank 6 can be reliably suppressed.

In this case, it is possible to avoid increasing the damping force of the damper 41 outside the region where the resonance frequency of the water tub 6 is passed, so that the vibration of the water tub 6 is not transmitted to the floor of the house where the washing machine is installed. be able to. Further, in this case, since it is possible to avoid increasing the damping force of the damper 41 unnecessarily, power consumption can be reduced.
In this case, the damping force of the damper 41 is increased in a plurality of areas that pass through the resonance frequency of the water tank 6 based on the detection result of the rotation speed detecting means. By executing the above, the resonance vibration of the water tank 6 can be further reliably suppressed.

[Third Embodiment]
In the third embodiment shown in FIG. 6, the damping force of the damper 41 is increased based on the detection result of the rotation speed detection means, which is the largest in the water tank 6 during deceleration from the high speed rotation of the drum 10. The process is executed only in a region that passes the resonance frequency at which resonance appears (in this case, the portion R ₄ where the rotational speed of the drum 10 is higher). In this case, not only during the deceleration of the drum 10, but also during the acceleration, a region that passes through the resonance frequency at which the largest resonance of the water tank 6 appears (in this case, the R having the higher rotational speed of the drum 10). _In part ₂ , the coil 37 of the damper 41 is energized (ON).

  By doing in this way, the resonance vibration of the water tank 6 can be sufficiently suppressed and the power consumption can be further reduced.

[Fourth Embodiment]
In the fourth embodiment shown in FIG. 7, the vibration detecting means increases the damping force of the damper 41 in the region passing through the resonance frequency of the water tank 6 during deceleration from the high-speed rotation of the drum 10. The process is executed based on the detection results of certain vibration sensors 48 and 49.
Specifically, as shown in FIG. 7B, the vibration sensors 48 and 49 continue to detect the vibration of the water tank 6, and the detection result (vibration data indicated by the waveform in FIG. 7) exceeds the threshold value. As shown in FIG. 7C, the coil 37 of the damper 41 is energized (ON).

Since the resonance of the water tank 6 can be determined by detecting the vibration of the water tank 6, the region that passes through the resonance frequency of the water tank 6 during the deceleration from the high speed rotation of the drum 10 (each R ₄ portion described above). Thus, by increasing the damping force of the damper 41 based on the detection results of the vibration sensors 48 and 49, the resonance vibration of the water tank 6 can be reliably suppressed.
In this case, not only when the drum 10 is decelerated, but also during acceleration, the vibration sensors 48 and 49 detect that the R ₂ portions passing through the resonance frequency of the water tank 6 are reached. The coil 37 of the damper 41 is energized (ON).

  Even in this case, the resonance vibration of the water tank 6 can be reliably suppressed, and the power consumption can be reduced. In particular, when there is little laundry misalignment (unbalance) in the drum 10 during the dehydrating operation, the water tank 6 is less vibrated, and in such a case, the detection results of the vibration sensors 48 and 49 are detected. Since the threshold value is not reached, there is no particular problem even if the damping force of the damper 41 is not increased. Therefore, power consumption can be reduced by avoiding energization of the coil 37.

The washing machine described above is not limited to the above embodiment, and can be implemented with appropriate modifications within a range not departing from the gist.
For example, when the damper 41 has the above-described configuration in which the damping force can be changed by energization, the secondary battery may be energized. The secondary battery is, for example, a rechargeable battery (85) described in Japanese Patent Application Laid-Open No. 2008-6182, and the control circuit (12) described in the same publication is replaced with the coil 37 of the damper 41 as an energization target of the rechargeable battery. By doing so, the change of the damping force of the damper 41 can be realized.

  By doing so, even if a power failure occurs during the dehydrating operation or the user accidentally unplugs the plug from the power outlet, the charged secondary battery causes the damper from the control device 5. Since the coil 37 of 41 can be energized, the resonance vibration of the water tank 6 can be reliably suppressed.

  As another example, when the damper 41 has the above-described configuration in which the damping force can be changed by energization, the damper 41 is energized by the regenerative power generated in the motor 8 when the drum 10 decelerates from the high speed rotation. Good. The regenerative power is, for example, regenerative power generated in the motor (20) described in JP-A-2002-374694 when the motor (20) is braked. By changing to the coil 37 of the damper 41, a change in the damping force of the damper 41 can be realized.

  In this way, as described above, even when a power failure occurs during the dehydration operation or when the user accidentally unplugs the plug from the power outlet, the charged secondary battery controls the control device. Since the coil 37 of the damper 41 can be energized from 5, the resonance vibration of the water tank 6 can be reliably suppressed.

Even in a situation where energization is possible from the main power supply (commercial power supply), power consumption can be reduced by energizing the coil 37 of the damper 41 using the regenerative power.
These secondary batteries and regenerative power are used not only in the first embodiment, but also in the second to fourth embodiments. In particular, in the second to fourth embodiments, Since the energization to the coil 37 of the damper 41 is limited, it is possible to cope with these secondary batteries and regenerative electric power that do not have a large capacity.

  In addition, the washing machine as a whole is not limited to the drum type, and can be similarly applied to a vertical washing machine having a water tank and a rotating tank in a vertical axis. Moreover, it does not need to have a drying function.

  In the drawings, 1 is an outer box, 5 is a control device (control means, rotational speed detection means), 6 is a water tank, 7 is a suspension, 8 is a motor (rotary tank drive motor), 10 is a drum (rotary tank), and 34 is Magnetorheological fluid (functional fluid), 37 is a coil, 41 is a damper, 44 is a damping force variable mechanism, 47 is a rotation sensor (rotational speed detection means), and 48 and 49 are vibration sensors (vibration detection means).

Claims (7)

An outer box,
A water tank located inside the outer box,
A rotating tub located inside the aquarium and driven to rotate;
The water tank is elastically supported inside the outer box, and includes a suspension having a damper that attenuates vibration of the water tank,
The damper is capable of changing the damping force, and the damping force is increased in a region passing through the resonance frequency of the water tank during deceleration from the high speed rotation of the rotating tank. A washing machine featuring.   2. A washing machine according to claim 1, further comprising a rotational speed detecting means for detecting the rotational speed of the rotating tub, wherein the damping force of the damper is increased based on a detection result of the rotational speed detecting means. .   The damping force of the damper is increased in a plurality of regions that pass through the resonance frequency of the water tank during deceleration from the high speed rotation of the rotating tank based on the detection result of the rotation speed detecting means. Item 2. A washing machine according to Item 2.   Based on the detection result of the rotation speed detection means, the damping force of the damper is increased only in the region that passes through the resonance frequency at which the largest resonance of the water tank appears during deceleration from the high speed rotation of the rotating tank. The washing machine according to claim 2, wherein:   There is a vibration detection means for detecting the vibration of the aquarium, and based on the detection result of this vibration detection means, when the vibration of the aquarium exceeds the threshold during deceleration from the high speed rotation of the rotation tank, the damper 2. The washing machine according to claim 1, wherein the damping force is increased.   The washing machine according to any one of claims 1 to 5, wherein the damper is capable of changing a damping force by energization, and is energized by a secondary battery.   The damper is capable of changing a damping force by energization, and is energized by regenerative electric power generated in the rotating tank drive motor when decelerating from the high speed rotation of the rotating tank. The washing machine according to any one of 5.

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