JP2000342884A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the occurrence of intensive rocking of inner and outer tubs when starting dehydration. SOLUTION: With the end of rinsing, water stored in an outer tub 5 is drained to a fixed water level (S1 and S2). After the level of water in the outer tub 5 reaches the fixed level, the rotation of an inner tub 6 is started and the number of rotations is increased to a prescribed number of stable rotations (about 150 rpm, for example), exceeding a number of resonant rotations (such as about 100 rpm, for example) (S4). When the number of rotations of the inner tub 6 reaches the number of stable rotations (YES in S4), drainage is restarted and after the completion of drainage, the number of rotations of the inner tub 6 is increased to the number of rotations required for dehydration (S7).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine which is less liable to vibrate when starting dewatering.

[0002]

2. Description of the Related Art Conventionally, an outer tank suspended in a housing via a hanging rod, an inner tank provided in the outer tank,
A pulsator provided in the inner tub, and a motor for generating a driving force for rotating the pulsator and the inner tub are provided. 2. Description of the Related Art There is known a washing machine in which both are rotated at a high speed to dehydrate laundry by centrifugal force. In such a washing machine, drainage is performed after washing or rinsing is completed, and dehydration is performed after drainage is completed.

[0003]

However, since the outer tub is hung by the hanging rod, the rotation speed of the inner tub (and the pulsator) is set to 100 rpm at the start of dehydration.
When it reaches the front and rear (resonance rotation speed), the inner tank and the outer tank resonate with the suspension rod, and the inner tank and the outer tank shake greatly.

[0004] Therefore, an object of the present invention is to provide a washing machine in which the inner tub and the outer tub are prevented from swaying at the start of dehydration.

[0005]

According to a first aspect of the present invention, there is provided a washing machine which is swingably held in a housing and is capable of storing water. The inner tub is provided rotatably in the outer tub and has a number of small holes formed on its peripheral surface. The inner tub is rotated at a high speed to remove moisture contained in the laundry stored in the inner tub. A washing machine that drains water in the outer tub out of the housing, and starts rotating the inner tub in a state where a predetermined amount of water is stored in the outer tub. After the rotation speed reaches a predetermined stable rotation speed exceeding the resonance rotation speed, the water in the outer tub is drained, and the dehydration processing means for increasing the rotation speed of the inner tub to the rotation speed required for dehydration is included. It is a washing machine.

[0006] During dehydration, the inner tub is rotated at a high speed in the outer tub, and the water contained in the laundry stored in the inner tub is dehydrated by centrifugal force. In this case, when the rotation of the inner tub is started and the rotation speed is increased, when the rotation speed becomes close to the resonance rotation speed (for example, about 100 rpm), the swing of the inner tub and the outer tub increases, and further, It is known that when the rotation speed of the inner tub is increased and the rotation speed exceeds the resonance rotation speed, the sway of the inner tub and the outer tub is substantially suppressed. In the configuration of the first aspect, in order to suppress shaking that occurs when the rotation speed of the inner tank is near the resonance rotation speed,
It uses water stored in the outer tank. Specifically, the rotation of the inner tank is started in a state where a predetermined amount of water is stored in the outer tank, and the rotation speed of the inner tank exceeds the resonance rotation speed. The number of rotations is set to be high enough to suppress the shaking of the tank, for example, 150 rpm. After that, the water in the outer tub is drained, and after draining, the rotation speed of the inner tub is increased to the rotation speed required for dehydration. In this case, when the rotation speed of the inner tank is around the resonance rotation speed, the water stored in the outer tank flows so as to prevent the inner tank and the outer tank from shaking, and when the inner tank is at the resonance rotation speed. In addition, it is possible to prevent the inner tank and the outer tank from shaking greatly.

After the rotation speed of the inner tub exceeds the resonance rotation speed and reaches a stable rotation speed, the sway of the inner tub and the outer tub is almost subsided, so that the water in the outer tub is drained to dehydrate the inner tub. Increase to the required high speed. According to a second aspect of the present invention, in the washing machine according to the first aspect, the dehydration processing means includes means for draining the water stored in the outer tub until the amount of water reaches a predetermined amount. When the amount of water reaches the specified value, stop draining, start the rotation of the inner tank and start the inner tank to a stable rotation speed, and after the rotation speed of the inner tank reaches a stable rotation speed, It is characterized by including means for draining accumulated water and means for judging completion of drainage and increasing the rotation speed of the inner tank to the rotation speed for dehydration.

According to the second aspect of the invention, the water is drained after the rotation speed of the inner tank reaches the stable rotation speed. Therefore, when a predetermined amount of water is stored in the outer tub, the rotation speed of the inner tub exceeds the resonance rotation speed, and this water causes the rotation speed of the inner tub to reach the resonance rotation speed. The resulting shaking of the outer tank and the inner tank is suppressed. by this,
It is possible to more reliably prevent the inner tank and the outer tank from shaking.

Further, a part of the water to be drained is left in the outer tank,
Since the remaining water is used to prevent shaking at the start of dehydration, extra water is not required as compared with the conventional washing process, and water can be saved. A washing machine according to a third aspect of the present invention is the washing machine according to the first aspect, wherein the dehydration processing means determines that the amount of remaining water in the outer tub at the time of drainage has reached a predetermined water amount; When the amount of water in the inner tank is determined to be a predetermined amount of water, means for starting rotation of the inner tank and raising the rotation speed of the inner tank to a stable rotation number, and determining that drainage of water in the outer tank has been completed. And a means for increasing the rotation speed of the inner tub to the dewatering rotation speed after the completion of drainage is determined.

According to the structure of the present invention, in order to drain the water in the outer tub from the time when the amount of water is a predetermined amount, it takes much longer time until the rotation of the inner tub reaches a stable rotation speed. Therefore, the rotation speed of the inner tank exceeds the resonance rotation speed in a state where a certain amount of water is accumulated in the outer tank. The water that has accumulated to some extent in the outer tub can prevent the outer tub and the inner tub from swaying when the rotation speed of the inner tub reaches the resonance rotation speed.

Further, since the rotation of the inner tub is started while draining, the time from the start of drainage to the rotation of the inner tub until dehydration can be shortened. Also in the above-described configuration, the water stored in the outer tank for preventing the shaking is water that should be drained, so that no extra water is required and water can be saved. According to a fourth aspect of the present invention, in the washing machine according to the first or second aspect, the dehydration processing means includes a means for storing a predetermined amount of water in the outer tub, and a predetermined amount in the outer tub. Means for starting rotation of the inner tub for dehydration after the water has accumulated, and for raising the rotation speed of the inner tub to a stable rotation speed in a state where water is accumulated in the outer tub. It is a feature.

According to the structure of the invention described in claim 4, water is supplied to the outer tank to a predetermined amount after drainage, and the water can suppress the oscillation of the inner tank and the outer tank at the time of resonance. According to a fifth aspect of the present invention, in the washing machine according to any one of the first to fourth aspects, the washing machine includes performing a rinsing step, and the dehydration processing unit relates to a drainage process after the rinsing. It is characterized by being executed.

According to the fifth aspect of the invention, the drainage after rinsing can prevent the inner tank and the outer tank from swaying at the time of resonance. Further, since the water after rinsing does not contain a detergent, there is no foaming when the inner tank is rotated. Furthermore, since the inner tub is rotated halfway during drainage, the time from the start of drainage to the high speed rotation of the inner tub can be further reduced. A washing machine according to a sixth aspect of the present invention is the washing machine according to any one of the first to fifth aspects, further comprising a swing detecting means for detecting a swing of the outer tub at the time of spin-drying, wherein the spin-drying processing means is a swing sensing means. Means for supplying a predetermined amount of water into the outer tank when the outer tank detects shaking, and means for starting rotation of the inner tank after the water has accumulated to a predetermined amount. It is assumed that.

According to the structure of the invention, water is accumulated in the outer tub and dehydration is started, so that the outer tub and the inner tub generated when the rotation speed of the inner tub reaches the resonance rotation speed. Of water can be suppressed by water. A washing machine according to a seventh aspect of the present invention is the washing machine according to any one of the first to sixth aspects, wherein the outer tub and the inner tub have a central axis inclined at a predetermined angle to the front side of the housing with respect to a vertical line. In addition, it is characterized by being arranged in a housing.

In a washing machine in which the outer tub is inclined, vibration at the time of starting dehydration may increase. However, according to the configuration of the present invention, the water stored in the outer tub prevents the water from swaying. As a result, the water in the inner tub and the outer tub during the start of dehydration can be suppressed by the water.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a simplified configuration of a fully automatic washing machine according to one embodiment of the present invention. The fully automatic washing machine 1 includes a box-shaped housing 2 having an opening on an upper surface. Housing 2
An opening / closing lid 3 for opening and closing the opening on the upper surface
Is attached. In the housing 2, an outer tub 5 for storing water used for washing is swingably supported by a suspension rod 4 with a spring. In the outer tub 5, an inner tub 6 capable of storing laundry is rotatably provided.

Above the outer tank 5, there is provided a water supply passage 11 to which a water supply hose 12 extending from, for example, a water tap (not shown) is connected. A water supply valve 13 is provided in the middle of the water supply passage 11. When the water supply valve 13 is opened, the tap water passes through the water supply hose 12 and the water supply passage 11 and passes through the inner tank 6.
Into the outer tank 5 through a number of small holes formed in the inner tank 6.

A drain 14 is formed at the bottom of the outer tub 5 for discharging the water stored in the outer tub 5 out of the housing 2. A drain pipe 15 extending to the outside of the housing 2 is connected to the drain port 14. A drain valve 16 is provided in the middle of the drain pipe 15. When the drain valve 16 is opened, the water stored in the outer tank 5 is discharged to the outside of the housing 2 through the drain pipe 15.

An air trap 17 is provided at one corner of the bottom of the outer tank 5. The air trap 17 is connected to a water level sensor 18 provided above the housing 2 via an air hose 19. When water is supplied into the outer tub 5, water enters the air hose 19 from the air trap 17 as the water level in the outer tub 5 rises, and the air in the air hose 19 is compressed. Conversely, when water is drained from the outer tub 5, the air pressure in the air hose 19 decreases as the water level in the outer tub 5 decreases. The water level sensor 18 detects the water level in the outer tub 5 based on such a change in the air pressure in the air hose 19.

In the housing 2, there is provided a safety switch 20 as a swing detecting means for detecting the swing of the outer tub 5. If the outer tub 5 shakes more than the allowable amount during dehydration or the like, the outer tub 5 hits the safety switch 20 and turns on the safety switch 20. The inner tub 6 serves as both a washing tub and a dewatering tub, and a large number of fine dewatering holes (small holes) 6 a are formed on the peripheral surface of the inner tub 6.

At the upper part of the inner tank 6, a balance ring 26 is provided over the periphery thereof. Balance ring 2
A suitable amount of salt water 27 is stored in the inner tank 6. When the inner tank 6 rotates, the salt water flows so as to prevent the inner tank 6 from shaking. A pulsator 21 for stirring water stored in the outer tank 5 to generate a water flow is provided at the bottom of the inner tank 6. The inner tub 6 and the pulsator 21 are supported by an output shaft 25 of a bearing 23 provided below the outer tub 5 so as to be capable of normal and reverse rotation.

A motor 22 for rotating the inner tank 6 and the pulsator 21 and a transmission mechanism 24 for transmitting the rotational force of the motor 22 to the bearing 23 are provided at the bottom of the housing 2.
And are provided. The driving of the inner tank 6 and the pulsator 21 and the driving of only the pulsator 21 can be switched. For example, at the time of washing and rinsing, the rotation of the motor 22 causes the pulsator 21 to rotate forward and backward. Further, at the time of dehydration, both the inner tub 6 and the pulsator 21 are rotated by the rotation of the motor 22. During this dehydration, the inner tub 6 and the pulsator 21 are rotated in one direction at a high speed, and the moisture contained in the laundry stored in the inner tub 6 is removed by centrifugal force.

Incidentally, the outer tub 5 and the inner tub 6 are sized to accommodate laundry having a dry weight of, for example, 7 kg. On the other hand, since the size of the housing 2 is the same as the conventional one, the space between the outer tub 5 and the housing 2 is narrow. Therefore, there is a problem that it is desired to prevent the outer tub 5 from shaking during dehydration or the like as much as possible. Balance ring 2 described above
6, the salt water 27 stored in it flows,
Although this is to prevent the inner tank 6 from shaking, in the present invention,
The same operation as that of the salt water 27 stored in the balance ring 26 is performed by storing water in the outer tub 5 so as to suppress the vibration caused by the resonance of the inner tub 6 and the outer tub 5 when the dehydration rises. Details will be described later.

FIG. 2 is a block diagram showing a configuration of a control circuit of the fully automatic washing machine 1 according to this embodiment. wash,
A series of washing operations including the rinsing and dewatering steps is performed by
It is executed under the control of the PU 41. The CPU 41 includes a ROM 42 storing a control program, a CPU 4
1 is connected to a RAM 43 used as a work area when the control program is executed, and a timer 44 for measuring an operation time and the like.

The water level sensor 18 and the safety switch 20 are connected to the CPU 41.
A signal from the water level sensor 18 and a signal from the safety switch 20 are input. Further, the CPU 41 controls opening and closing of the water supply valve 13 and the drainage valve 16, driving / stopping of the motor 22, switching of the rotation direction, and the like based on each of the above input signals and a control program stored in the ROM 42. I do.

FIG. 3 is a flowchart showing an example of the control performed by the CPU 41. The washing operation includes, for example, a washing step, an intermediate dehydrating step after washing, a rinsing one step, an intermediate dehydrating step after rinsing, a rinsing two step, and a final dehydrating step, and these steps are executed in this order. In this embodiment, a dehydration process for suppressing the swing of the outer tub 5 is performed in the intermediate dehydration step after rinsing and the final dehydration step.

FIG. 4 is a flowchart of a dehydration process for suppressing the shaking of the outer tub 5. FIG. 5 is a diagram showing a change in the amount of water in the outer tub 5 during the dehydration process. In this dehydration process, first, the drain valve 16 is opened, and the water level A
The drainage of the water stored up to this point is started (step S
1, FIG. 5 (a)) During drainage, the output of the water level sensor 18 is constantly referred to by the CPU 41, and it is checked whether the water level in the outer tub 5 has dropped to a predetermined constant water level B. I have. When the water level in the outer tub 5 reaches the fixed water level B (YES in step S2, FIG. 5B), the drain valve 16 is closed, and the drain is stopped once.

The rotation of the motor 22 is started simultaneously with the stop of the drainage, and the inner tub 6 and the pulsator 21 are started to rotate in one direction for dehydration (step S3). When the inner tank 6 and the like are rotated in the outer tank 5 suspended by the hanging rod 4,
In general, resonance occurs at a certain rotation speed (for example, around 100 rpm), and the entire outer tub 5 shakes greatly. Therefore, in this embodiment, the swing of the outer tank 5 at the time of resonance is reduced by using the water in the outer tank 5.

Specifically, the inner tank 6 and the like are started to rotate in a state where the water of the water level B is stored in the outer tank 5, and the rotation speed is increased to a predetermined stable rotation speed exceeding the resonance rotation speed (for example, about 100 rpm). (For example, about 150 rpm) (step S4). When the rotation speed of the inner tub 6 reaches the stable rotation speed (YES in step S4), the drain valve 16 is opened,
The drainage of water in the outer tank 5 is restarted. The stable rotation speed is set higher than the resonance rotation speed, but is preferably set so as not to become too high in consideration of resistance due to water.

When the inner tub 6 is rotated in a state where the water of the constant water level B is stored in the outer tub 5, the water stored in the outer tub 5 is
Like the salt water 27 of the balance ring 26, the fluid flows so as to prevent the outer tank 5 and the inner tank 6 from swaying. Specifically, when the outer tub 5 shakes, the water accumulated at the bottom of the outer tub 5 flows in a direction in which the outer tub 5 does not shake due to its fluid properties and inertia. This makes it possible to suppress the swing of the outer tub 5 and the inner tub 6 that occurs when the rotation speed of the inner tub 6 reaches the resonance rotation speed at the start of the dehydration. This constant water level B will be an effective water level to prevent shaking,
Determined based on experimental data.

After the drainage of the water stored in the outer tub 5 is completed, the rotation speed of the inner tub 6 and the pulsator 21 is increased to the dewatering rotation speed required for dewatering (step S7), and dewatering is performed for a predetermined time. . In this embodiment, the sway of the outer tub 5 due to resonance at the start of dehydration can be reduced, and the inner tub 6 is rotated halfway through the drainage after rinsing, so that dehydration is started after drainage is completed. In comparison, the time from the start of drainage to the high speed rotation of the inner tub 6 can also be reduced.

It should be noted that this control routine is not executed when the dehydration is started in the intermediate dehydration process after the washing, because if the dehydration is started by using the water after the washing, This takes into account the fact that when the tank 6 is rotated, a lot of foaming occurs, which may hinder dehydration. In this embodiment, as shown in steps S3 to S5, the drainage is temporarily stopped and then the rotation of the inner tub 6 is started, and the drainage is started after the rotation speed reaches a stable rotation speed. However, the drainage is continued (step S
It is also possible to start the rotation of the inner tank 6 without stopping the drainage at 3). In order to drain the water at the constant water level B stored in the outer tank 5, a considerably longer time is required than the time required for the rotation speed of the inner tank 6 to exceed the resonance rotation speed. This is because the rotation speed of the inner tub 6 exceeds the resonance rotation speed in a state where water close to the constant water amount B is accumulated. In this case, since the drainage is not stopped, the time from the start of drainage to the high speed rotation of the inner tub 6 can be further reduced.

Further, in the above-described embodiment, the rinsed water is used for the start of the dehydration. However, after all the rinsed water is drained, the water for the start of the dehydration is again placed in the outer tank 5. May be supplied. Hereinafter, the embodiment will be described with reference to FIG. First, the drain valve 16
Is opened, the water stored in the outer tank 5 is drained (step S11), and when the drainage is completed (step S12),
The drain valve 16 is closed, the water supply valve 13 is opened, and the outer tank 5 is closed.
Water supply to the inside is started (step S13). When it is detected that the water level in the outer tub 5 has reached the predetermined water level B by the water supply (YES in step S14), the water supply valve 13 is closed, and the water supply is stopped.

The subsequent control is performed in the same manner as the control after step S3 in FIG. That is, with the stop of the water supply, the inner tank 6 and the pulsator 21 start to rotate in one direction, and the rotation speed of the inner tank 6 becomes a stable rotation speed (about 150 rpm).
Is reached, the rotation of the inner tank 6 is maintained at this stable rotation speed (steps S15 to S17). When the rotation speed of the inner tub 6 reaches a stable rotation speed, the drainage of the water in the outer tub 5 is started, and after the drainage is completed, the inner tub 6 and the pulsator 21 are discharged.
Is increased to the spinning speed required for spinning (steps S16 to S19).

As shown in steps S15 to S17, rotation of the inner tub 6 is started, and the drainage is started after the rotation speed reaches a stable rotation speed. Drainage may be started simultaneously with the start of rotation of. This method of supplying water for the start of dehydration after drainage is completed can be used not only for the intermediate dehydration step after rinsing and the final dehydration step but also for the intermediate dehydration after washing. This is because the supplied water is not the water used for washing and has little foaming at the start of dehydration.

The above control at the start of dehydration can also be used for control at the start of re-dehydration when the swing is detected by the safety switch 20. Safety switch 2
0 is made to work by the shaking of the outer tub 5 as described above. When the shaking of the outer tub 5 exceeds the allowable amount,
It is possible that the laundry in the inner tub 6 is biased. In order to eliminate the unevenness of the laundry, for example, approximately one cup of water is stored in the outer tub 5 and rinsing is performed for a short time. However, in that case, a large amount of water is used and it takes time. Therefore, in this embodiment, the dehydration start-up control is performed.

FIG. 7 is a flowchart for explaining the control. At the start of the conventional dehydration without storing water in the outer tub 5, if the swing of the outer tub 5 is less than allowable, the dehydration is performed as it is (Step S 31). Turns on (step S2)
1 and YES). Then, the CPU 41 stops the dehydration operation, opens the water supply valve 13, and supplies a fixed amount of water into the outer tub 5 (step S22).

When it is detected that the water level in the outer tub 5 has reached a certain level by the water supply (YES in step S23), the water supply valve 13 is closed and the water supply is stopped (step S2).
4). At the same time as the water supply is stopped, the spin-drying is started. With the start of the spin-drying operation, the inner tank 6 and the pulsator 2
1 starts rotating in one direction (step S21). Until the rotation speed reaches a stable rotation speed (for example, about 150 rpm) exceeding a resonance rotation speed (for example, 100 rpm), it is confirmed whether or not the rotation starts without turning on the safety switch 20 (step S25, S2
9).

As described above, one of the causes of the swing of the outer tub 5 during dehydration is that the laundry accommodated in the inner tub 6 is eccentric. When the fluctuation of the inner tub 6 is not so large, the water can be prevented from oscillating during resonance by storing water in the outer tub 5 and starting dehydration. On the other hand, if the laundry is too uneven and you want to start up to a stable speed,
In addition, when the swinging occurs and the detection by the safety switch 20 is performed again (YES in step S29), the loosening for eliminating the unevenness of the laundry is performed (step S30).

When dehydration is started by storing water in the outer tank 5,
When the rotation speed of the inner tub 6 reaches a stable rotation speed without turning on the safety switch 20, the resonance range is exceeded, and the inner tub 6 and the outer tub 5 do not greatly shake thereafter. In the state where the rotation speed of the outer tub 6 is maintained at the stable rotation speed, the drainage of the water remaining in the outer tub 5 is started (step S2).
6) When drainage is completed (step S27), the rotation speeds of the inner tub 6 and the pulsator 21 are increased to the high rotation speed required for dehydration (step S28).

In this embodiment, the drainage is started after the rotation speed of the inner tub 6 reaches a stable rotation speed. However, the invention is not limited to this. The drainage may be started at the same time.
In this case, since the rotation of the inner tub 6 is started while the drainage is being performed, the time until the inner tub 6 reaches the dehydration rotation can be shortened.

In the above description, a conventional orthodox fully automatic washing machine as illustrated in FIG. 1 has been described as an example, but not only the orthodox fully automatic washing machine but also a specific form of the full automatic washing machine. The present invention can be applied to an automatic washing machine. For example, the applicant of the present application is Japanese Patent Application No. Hei.
No. 1-124551 proposes a washing machine in which a washing tub is inclined at a predetermined angle to the front side in a housing. In the case of a washing machine in which such a washing tub is inclined, that is, in the case of a washing machine in which the outer tub and the inner tub provided therein are arranged so that their central axes are inclined with respect to the vertical line, the dehydration start-up is performed. Is expected to increase. This is because, when the rotation center axis of the inner tank is inclined, it is expected that vibration accompanying resonance will increase. If the technical idea of the present invention is applied to such a washing machine in which the inner tub and the outer tub are inclined, water stored in the outer tub flows so as to prevent resonance vibration at the time of dehydration startup, and the inner tub and The shaking of the outer tank can be suppressed.

In addition, various changes can be made within the scope described in the claims.

[Brief description of the drawings]

FIG. 1 is a simplified sectional view showing a configuration of a fully automatic washing machine according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a control circuit.

FIG. 3 is a flowchart illustrating an example of control performed by a CPU.

FIG. 4 is a flowchart of a dehydration process that suppresses shaking of the outer tub.

FIG. 5 is a diagram showing a change in the amount of water in an outer tank.

FIG. 6 is a flowchart of a dehydrating process of a washing machine according to another embodiment.

FIG. 7 is a flowchart illustrating a spin-drying start-up of a washing machine according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fully automatic washing machine 5 Outer tub 6 Inner tub 13 Water supply valve 16 Drainage valve (drainage mechanism) 18 Water level sensor

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B155 AA06 AA18 BA04 BB16 CA16 KA19 KA33 KA35 KB02 LA02 LA14 LB02 LB05 LB18 LC30 LC33 MA01 MA02 MA06 MA08

Claims (7)

[Claims] 1. An outer tank which is swingably held in a housing and is capable of storing water, and an inner tank rotatably provided in the outer tank and having a plurality of small holes formed in a peripheral surface thereof. A washing machine for rotating the inner tub at a high speed to remove water contained in the laundry stored in the inner tub, wherein a drainage mechanism for discharging water in the outer tub to the outside of the housing; Start the rotation of the inner tank in a state where a predetermined amount of water is stored in the tank, and drain the water in the outer tank after the rotation speed of the inner tank reaches a predetermined stable rotation speed exceeding the resonance rotation speed. A dehydrating means for increasing the rotation speed of the inner tub to the rotation speed required for dehydration. 2. The washing machine according to claim 1, wherein the dehydrating means drains water until the water stored in the outer tub reaches a predetermined amount, and the water in the outer tub reaches a predetermined amount. Means to stop the drainage, start the rotation of the inner tank and start the inner tank to a stable rotation speed, and the water accumulated in the outer tank after the rotation speed of the inner tank reaches the stable rotation speed. A washing machine comprising: means for draining water; and means for determining completion of drainage and increasing the rotation speed of the inner tub to the rotation speed for dehydration. 3. The washing machine according to claim 1, wherein the dehydration processing means includes means for determining that the amount of remaining water in the outer tub at the time of drainage has reached a predetermined water amount; When it is determined that the amount of water is determined in advance, means for starting rotation of the inner tank, raising the rotation speed of the inner tank to a stable rotation speed, means for determining that drainage of water in the outer tank has been completed, Means for increasing the number of rotations of the inner tub to the number of rotations for dehydration after completion of drainage is determined. 4. The washing machine according to claim 1, wherein the dehydration processing means includes means for storing a predetermined amount of water in the outer tub, and means for storing a predetermined amount of water in the outer tub. A means for starting rotation of the inner tub for dehydration and raising the rotation speed of the inner tub to a stable rotation speed in a state where water is accumulated in the outer tub. 5. The washing machine according to claim 1, wherein the washing machine performs a rinsing step, and the dehydration processing means is executed in connection with a drainage treatment after rinsing. A washing machine characterized by being a thing. 6. The washing machine according to any one of claims 1 to 5, further comprising a swing detecting means for detecting a swing of the outer tub at the time of dehydration, wherein the dehydration processing means is provided with an outer tub. A washing machine comprising: means for supplying a predetermined amount of water into an outer tub when a shake is detected; and means for starting rotation of the inner tub after the water has accumulated to a predetermined amount. . 7. The washing machine according to claim 1, wherein the outer tub and the inner tub are arranged inside the housing such that a center axis is inclined at a predetermined angle toward a front side of the housing with respect to a vertical line. A washing machine characterized by being arranged in a washing machine.