JPH09122376A - Washing and dewatering machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of abnormal vibration and noises and to improve dewatering efficiency, by starting dewatering at a high level of residual water in the rotary tub when washing amount is much and at a low level when little in performing from draining to dewatering. SOLUTION: For controlling a sequence from draining to dewatering by a control circuit, whether the sequence is after rinsing or not is judged at first, and, when the answer is 'YES', the level of dewatering start is set according to the amount of washing judged at the initial period of washing. That is, a higher water level A1 is set when the washing amount is 'MUCH', a medium level A2 when 'STANDARD', and a lower level A3 when 'LITTLE' respectively. At second, a drainage valve 9 is opened to drain water in a rotary tub 4 through a main drainage path 11, and when the residual water level is detected to be a level lower than a prescribed level, dewatering is started. At that time, washing is uniformly displaced toward periphery parts to suppress generation of imbalance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined washing machine having a rotary tub for pumping and dehydrating water.

[0002]

Conventionally, as a washing machine for combined use of dehydration, a rotating tank having a large number of dehydration holes in a peripheral wall and a bottom wall is provided inside a water receiving tank, and an agitator is provided at an inner bottom portion of the rotating tank. The arrangement is well known. In this case, since the rotary tank and the water receiving tank are in communication with each other at the time of washing, water is contained in both the tanks. Therefore, for example, when performing drainage and dehydration after rinsing, open the drain valve to drain the water in both tanks, and when the drainage is completed, rotate the rotary tank to perform dehydration. I have to.

However, in the above-mentioned conventional structure, the laundry in the rotary tub may be unevenly distributed or gathered in the central portion after drainage, which causes abnormal vibration and noise, and reduces the dehydration efficiency. Or There is also a problem that it takes time from drainage to completion of dehydration.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent abnormal vibration and noise from occurring, to improve the dehydration efficiency, and to complete the process from drainage to completion of dehydration. An object is to provide a washing machine for combined use of dehydration that can shorten the time.

[0005]

SUMMARY OF THE INVENTION The present invention is substantially non-perforated except for an outer tub and an outer tub provided inside the outer tub and having a drainage water passage at the top and a drainage water passage at the bottom. Make a state,
Determines the amount of laundry and the rotary tub that drains the internal water through the drainage water passage during drainage, and is rotated during dewatering to pump the internal water and discharge it from the dehydration water passage into the outer tub. About the laundry amount determination means, the water level detection means for detecting the water level in the rotary tub, and the dehydration from the drainage, when the laundry amount is large, the dehydration is started at a high residual water level in the rotary tub However, when the amount of laundry is small, it comprises drainage / dehydration control means for starting dehydration at a low water level in the rotary tub.

In the above-mentioned structure, since the dehydration is started while there is residual water in the rotary tub at the time of draining, the laundry is evenly located in the peripheral portion inside the rotary tub.
That is, when the rotary tub is rotated and dehydrated, the water in the tub is pumped and dehydrated, and as a result, the laundry is also displaced to the peripheral part of the rotary tub together with the water. As a result, unbalanced rotation is reduced and abnormal vibration and noise are prevented. Moreover, unlike the case where the laundry is present in the center of the rotary tub, a large rotational centrifugal force acts on the laundry, so that the dehydration efficiency can be improved. Furthermore, the time required from drainage to completion of dehydration is shortened.

Particularly, when the amount of laundry is large, dehydration is started at a high residual water level in the rotary tub, and when the amount of laundry is small, dehydration is started at a low residual water level in the rotary tub. Whether there is a large amount or a small amount, the laundry is always located evenly in the peripheral portion inside the rotary tub. That is, if dehydration is started with a small amount of residual water when the amount of laundry is large, the laundry is less likely to be displaced to the inner peripheral portion of the rotary tub, but in this case, the water level for starting dehydration is set according to the amount of laundry. There is no such thing. Therefore, the above-mentioned effects can be obtained regardless of the amount of laundry.

Further, when the washing water level is high, dehydration is started at a high residual water level in the rotary tank, and when the washing water level is low, dehydration is started at a low residual water level in the rotary tank. Good, since the washing water level is usually set to a high or low level depending on the amount of laundry, the same action and effect can be obtained.

Furthermore, when the quality of the laundry is hard (so-called stiff), dehydration is started at a high residual water level in the rotary tub, and when the fabric is soft, the residual water level in the rotary tub is The dehydration may be started at a low position. In this case, the laundry is always located evenly in the peripheral portion inside the rotary tub regardless of the quality of the cloth. That is, when the cloth quality is stiff and the dehydration is started with a small amount of residual water, the laundry is less likely to be displaced to the inner peripheral portion of the rotary tub, but this is not the case.
Therefore, abnormal vibration and noise can be prevented, the dehydration efficiency can be improved, and the time required from drainage to completion of dehydration can be shortened.

In addition, a main drainage channel communicating with the drainage water passage portion of the rotary tank to the outside of the machine and having a drainage valve in the middle, and the main drainage passage from the inside of the outer tank by bypassing the drainage valve. In a configuration in which an auxiliary drainage channel communicating with the drainage channel is provided, the drainage valve may be closed when the rotation speed of the rotary tank reaches or exceeds a predetermined rotation speed during dehydration. In this case, the water discharged from the rotary tank into the outer tank can be quickly discharged, and a decrease in the rotation start-up of the rotary tank due to the accumulation of a large amount of water between the rotary tank and the outer tank can be prevented. Therefore, the dehydration efficiency can be improved.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. In FIG. 2, an outer tub 2 is swingably disposed in an outer box 1 via an elastic suspension mechanism 3. In the outer tub 2, a rotary tub 4 which doubles as a washing tub and a dehydrating tub is rotatably provided, and an agitator 5 having a large number of water passage holes is rotated at the inner bottom of the rotary tub 4. It is possible. The rotary tank 4 is
The peripheral wall portion is formed in a tapered shape that gradually expands as it goes upward. A dehydration hole 4a serving as a dehydration water passage portion is formed in the upper portion of the peripheral wall portion, a water passage port 4b serving as a drainage water passage portion is formed in the bottom portion, and the other portions are non-perforated.

At the inner bottom of the outer tank 2, the rotary tank 4 is provided.
A drainage passage 6 is provided so as to extend from the water passage 4b to the rear side. Further, in the outer tub 2, a rear end portion of the drainage passage 6 serves as a drainage port 7, and the drainage port 7 is provided with an air trap 8 for detecting a water level. The drain port 7 is configured to be opened and closed by, for example, a motor-type drain valve 9. A drain hose 10 communicating with the outside of the machine is connected to the lower portion of the drain valve 9. Then, the drain passage 6, the drain port 7, the drain valve 9 and the drain hose 10 are provided.
The main drainage channel 11 (also shown in FIG. 3) is configured by.

In this structure, when the drain valve 9 is opened, the water in the rotary tank 4 is discharged to the outside through the main drain passage 11 described above. In addition, an auxiliary drainage port 2a for draining the water discharged from the rotary tub 4 by the dehydration rotation is formed in the front part of the bottom of the outer tub 2. This auxiliary drainage port 2a bypasses the drainage valve 9 through a connecting hose 12 which is an auxiliary drainage channel and bypasses the main drainage channel 11a.
Is connected to the drainage hose 10. In this configuration,
The water in the rotary tank 4 passes through the dehydration hole 4a during the dehydration, etc.
When discharged to the inside, this drainage is configured to be discharged to the outside through the auxiliary drainage port 2a, the connecting hose 12 and the drainage hose 10. The air trap 8 has a water level sensor 13 (see FIG.
Are connected via an air pipe 14, and the water level sensor 13 detects the water level in the rotary tank 4.

A balance ring 15 is arranged above the rotary tank 4. A substantially drum-shaped inner basket 16 is disposed on the inner peripheral portion of the rotary tank 4, and the inner basket 16 is made of a stainless steel plate and has a large number of water passage holes formed on the peripheral wall portion. There is. A bottom cover 17 is arranged below the inner peripheral portion of the rotary tank 4. A predetermined gap for water passage is provided between the inner basket 16 and the rotary tub 4, and between the bottom cover 17 and the rotary tub 4. In the case of this configuration, the water in the rotary tank 4 flows downward or upward through the predetermined gap for water passage during drainage or dehydration.

On the other hand, on the outer bottom portion of the outer tub 2, a motor 18 and a drive mechanism portion 19 for washing and dehydrating operations are arranged. The rotational force of the motor 18 is transmitted to the drive mechanism section 19 via the belt transmission mechanism 20. The drive mechanism section 19 has a well-known configuration and includes a clutch mechanism, a speed reducer, a brake device, and the like. The clutch mechanism of the drive mechanism unit 19 has a state in which the rotational force of the motor 18 is decelerated and transmitted only to the stirring body 5 via the reduction gear when washing, and a state in which it is transmitted to the rotary tank 4 and the stirring body 5 at high speed during dehydration. It has a switching function.

A top cover 2 is provided on the top of the outer box 1.
1 is attached, and an electromagnetic water supply valve 22 and a detergent dispenser 22a are provided at a rear portion of the top cover 21. Detergent dispenser 22a
By containing the detergent in advance, the water is transferred into the tank by the water when the water is supplied by the water supply valve 22. The top cover 21 is provided with, for example, a half-foldable lid 23 that can be opened and closed so as to open and close the entrance of the laundry. A tank cover 24 is attached to the upper portion of the outer tank 2, and an inner lid 25 is provided on the tank cover 24 so as to be openable and closable.

Further, an operation panel 26 as shown in FIG. 4 is provided on the front upper surface of the top cover 21. On the operation panel 26, a start switch 27 for start and pause, a course change switch 28, stroke selection switches 29 to 31, a water level setting switch 32, a cloth quality designating switch 33 as a fabric quality information designating device, and a favorite rinse. A setting switch 34, a clock setting switch 35, a reservation setting switch 36, an hour setting switch 37, a minute setting switch 38, a course display 39, a numerical display 40 for displaying a travel time, a water level display 41, etc. are provided. .

On the other hand, in FIG. 1 showing the electrical configuration in combination of functional blocks, the control circuit 42 is composed of a microcomputer or the like and has a function of controlling the overall washing operation, and a control program therefor is provided. I remember. The control circuit 42 has a function as an operation control unit, a laundry amount determination unit, a drainage / dehydration control unit, and a drainage valve control unit. Then, the control circuit 42 outputs various switch signals from the switch input section 43 including various switches of the operation panel 26, a water level detection signal from the water level sensor 13, and a pulse signal according to the rotation of the motor 18. It is configured to receive a pulse signal from the rotation sensor 44 that is generated. In this case, the control circuit 42 detects the rotation speed of the motor 18 based on the pulse signal from the rotation sensor 44, and also detects the rotation speed of the rotary tub 4 from the rotation speed of the motor 18 at the time of dehydration. There is.

Further, the control circuit 42 includes a display section 45 having various indicators of the operation panel 26, a buzzer 46 as an informing means, a water supply valve 22, a drain valve 9 and a motor 18 via a drive circuit 46. It is configured to control energization (driving).

When the "standard" course is selected by the course setting switch 28 and the operation is started, the control circuit 42, as is well known, is water supply, washing, drainage, dehydration (intermediate dehydration), dehydration rinse, Dehydration (intermediate dehydration), water supply,
Each process of rinsing (trial rinsing), drainage, and dehydration (final dehydration) is performed. In each process of washing and rinsing, the stirring body 5 is driven to rotate to wash water and laundry in the rotary tub 4. Is designed to be stirred. Further, in the dehydration process, the rotary tank 4 is operated at a constant rotation speed (maximum rotation speed).
Is designed to rotate.

Now, when the above-mentioned "standard" course is set and the operation is started, the control circuit 42 carries out the control from drainage to dehydration according to the contents shown in the flowchart of FIG. There is. Hereinafter, the control of drainage and dehydration will be described with reference to FIG. 5, but the determination of the amount of laundry is executed in the initial stage of washing, and this determination method is used for the unknown amount in the rotary tub 4. In the state where the laundry is stored, the stirring body 5 is rotated in a predetermined pattern without water, and the rotation speed of the stirring body 5 at that time, that is, the motor 1
8 is measured, and the laundry amount is determined based on the magnitude of the rotation speed. In this case, the amount of laundry is determined to be one of three levels: "large amount", "standard amount" and "small amount". The laundry determination method is not limited to this, and may be a method of measuring the load current of the motor 18 or the like, or may be performed with a proper amount of water added.

In step S1 of FIG. 5, it is judged whether or not drainage and dehydration after rinsing are performed, and if so, the process proceeds to step S2. In this step S2,
Water level A for starting dehydration according to the determined laundry amount
Set. That is, specifically, when the amount of laundry is "large amount", the water level A is set to a higher water level A1 (see FIG. 2), when it is "standard amount", it is set to an intermediate water level A2, and when it is "small amount". Set lower water level A3 respectively.

Then, in step S3, the drain valve 9 is opened. At the end of rinsing, the water is stored only in the rotary tank 4, and by opening the drain valve 9, the rotary tank 4 is opened.
The water inside is discharged through the main drainage channel 11, whereby the residual water level in the rotary tank 4 gradually decreases.

In step S4, the residual water level Ak detected by the water level sensor 13 is the set water level A (A1, A2, A
(Any one of 3) or less, and if it becomes the following, the process proceeds to step S5 to start dehydration by rotating the rotary tank 4. As a result, the water in the rotary tank 4 spreads in the circumferential wall direction by the centrifugal force, and the circumferential wall is lifted and discharged into the outer tank 2 through the dehydration hole 4a. At this time, the movement of the water causes the laundry inside to be evenly displaced to the periphery. This suppresses the occurrence of imbalance.

Particularly, when the amount of laundry is large, dehydration is started at a place where the residual water level in the rotary tub 4 is high (water level A1), and when the amount of laundry is the standard amount, the residual water level is in the middle. Dewatering is started at (water level A2) and when the amount of laundry is small, dehydration is started at a place where the remaining water level in the rotary tub is low (water level A3). It is always located evenly in the peripheral portion inside the rotary tank 4. That is, when dehydration is started with a small amount of residual water when the amount of laundry is large, the laundry is less likely to be displaced to the inner peripheral portion of the rotary tub 4, but this is not the case.

Then, in step S6, it is determined whether or not a large imbalance has occurred, just in case. This unbalance detection method determines that the unbalance is large when the rise of the rotation speed of the motor 18 is low. If the imbalance is not large,
After shifting to step S7, the rotation speed of the rotary tank 4 is a predetermined rotation speed (for example, a value of 200 r.pm to 300 r.pm).
It is determined whether or not the above.

When the rotational speed is equal to or higher than the predetermined rotational speed, the process proceeds to step S8 and the drain valve 9 is closed. That is,
When the amount of laundry is large, the rotary tub 4 is 200 rpm to 300 rpm.
At the rotation speed of rpm, the amount of water dehydrated increases rapidly. That is, the amount of water (the flow of the water is indicated by the arrow X in FIG. 3 and the flow rate is indicated by the line Qx in FIG. 6) passing through the connection hose 12 serving as the auxiliary drainage channel is rapidly increased. In this case, since the water drained from the inside of the rotary tank 4 (the flow of the water is indicated by the arrow Y in FIG. 3 and the flow rate is indicated by the line Qy in FIG. 6) passes through the main drainage channel 11, the connecting hose is connected. The drainage of the water passing through 12 decreases, and as a result, the amount of water between the outer tub 2 and the rotary tub 4 increases, the rotation start-up of the rotary tub 4 deteriorates, and the dehydration noise also increases. However, in this embodiment,
Since the drain valve 9 is closed to stop draining as described above,
The drainage of water passing through the connecting hose 12 is improved, and as a result,
The amount of water between the outer tub 2 and the rotary tub 4 does not increase, the rotation of the rotary tub 4 rises better, and dehydration noise can be suppressed. Thereafter, in step S9, it is determined whether or not the dehydration time has expired, and if so, the process proceeds to the next step.

When it is determined in step S6 that the unbalance is large, the process proceeds to steps S10, S11 and S12. That is, step S10
Then, the drain valve 9 is closed, and the rotation of the rotary tub 4 is stopped to stop the dehydration. In step S11, after the water is supplied into the rotary tub 4, the agitator 5 is rotationally driven, thereby eliminating the imbalance. Then, in the next step S12, the drain valve 9 is opened and the process returns to step S4.

If it is determined in step S1 that the drainage and dehydration after rinsing are not performed (if intermediate dehydration is determined), the process proceeds to step S13 and the drainage valve 9 is opened.
Next, in step S14, it is determined whether or not the current water level has reached the reset water level (see FIG. 2), and when it reaches the reset water level, the process proceeds to step S15 and the rotary tank 4 is rotated to start dehydration. To do. Then, in step S16, it is determined whether or not the imbalance is large, and if it is large, the process proceeds to steps S10, S11 and S12 described above, and if it is not unbalanced, the process proceeds to step S17 and the dehydration time expires. It is judged whether or not it is done, and when it is completed, the process is shifted to the next step.

According to the above-mentioned embodiment, since the dehydration is started while there is residual water in the rotary tub 4 during drainage, the laundry is evenly located in the peripheral portion inside the rotary tub 4, As a result, unbalanced rotation is reduced and abnormal vibration and noise are prevented. Moreover, unlike the case where the laundry is present in the central part of the rotary tub, a large rotational centrifugal force acts on it, so that the dehydration efficiency can be improved. Furthermore, since the drainage is performed earlier, the time required to complete the dehydration becomes shorter.

Particularly, when the amount of laundry is large, dehydration is started when the residual water level in the rotary tub 4 is high, and when the amount of laundry is small, dehydration is started when the residual water level in the rotary tub 4 is low. Whether the amount of laundry is large or small, the laundry can always be evenly placed in the peripheral portion inside the rotary tub 4, so that the above-described effects can be obtained regardless of the amount of laundry.

Further, according to this embodiment, the rotary tank 4 is used at the time of dehydration.
Drainage valve 9 when the rotation speed of
Since the drainage is stopped when the amount of dehydrated water rapidly increases, the water can be quickly discharged without being retained between the outer tub 2 and the rotary tub 4, and It is possible to prevent the rotation start-up from decreasing,
It is possible to improve the dehydration efficiency and suppress the generation of noise.

Next, FIG. 7 shows a second embodiment of the present invention. This embodiment is different from the first embodiment in the following points. That is, as can be seen from step R2, the wash water level (water level set manually or automatically during washing)
The water level A for starting dehydration is set according to the above. Specifically, when the wash water level is "high" (see Fig. 2), the water level A is set to a higher water level A1 (see Fig. 2), and when it is "medium", it is set to an intermediate water level A2 and "low". At that time, the water level is set to a low water level A3. In this case, since the washing water level is set higher as the amount of laundry increases, the same effect as that of the first embodiment can be obtained. In addition, for example, when the amount of laundry is determined and the wash water level is manually set, the above-mentioned water level A may be determined by prioritizing the determination result of the amount of laundry.

FIG. 8 shows a third embodiment of the present invention, which is different from the first embodiment in the following points. In the third embodiment, as can be seen from step G2, the water level A is set according to the quality of the laundry. In this case, when the switch input by the cloth quality designation switch 33 shown in FIG. 4 is the cloth quality “hard”, the water level A is set to a higher water level A1 (see FIG. 2) and the cloth quality “ When it is "standard", it is set to an intermediate water level A2, and when it is "flexible", it is set to a lower water level A3. In this case, the laundry is always located evenly in the peripheral portion inside the rotary tub 4 regardless of the cloth quality.

That is, when the dehydration is started with a small amount of residual water when the cloth quality is stiff, the laundry is unlikely to be displaced to the inner peripheral portion of the rotary tub 4, but this is not the case. Therefore, abnormal vibration and noise can be prevented, the dehydration efficiency can be improved, and the time required from drainage to completion of dehydration can be shortened.

Information about the cloth quality may be automatically obtained. In this case, as the cloth quality information designating means, the motor 18 is intermittently energized for a predetermined number of times in a predetermined time in a state where a proper amount of water is contained in the rotary tub 4 containing laundry, and the stirring member at each energization is used. 5 rotations (motor 1
8 rotations), take the absolute value of the difference between the previous measurement and the current measurement, and add up the absolute values. The higher the cumulative value, the closer the cloth quality is to "stiff" There is a method to do.

[0037]

As apparent from the above description, the present invention has the following effects. According to the invention of claim 1, since the dehydration is started while there is residual water in the rotary tub at the time of drainage, the laundry is evenly located in the peripheral portion inside the rotary tub. Balance rotation can be reduced, abnormal vibration and noise can be prevented, and moreover, dehydration efficiency can be improved.
Furthermore, the time required from drainage to completion of dehydration can be shortened. Moreover, when the amount of laundry is large, dehydration is started at a high water level in the rotary tub, and when the amount of laundry is low, dehydration is started at a low water level in the rotary tub. Regardless, the above effect can be obtained.

According to the second aspect of the present invention, when the wash water level is high, dehydration is started at a high residual water level in the rotary tank, and when the wash water level is low, dehydration is performed at a low residual water level in the rotary tank. It is possible to reduce unbalanced rotation, prevent abnormal vibrations and noises, improve drainage efficiency, and shorten the time required from drainage to completion of dehydration. it can.

According to the third aspect of the invention, when the cloth quality of the laundry is hard, dehydration is started at a high water level in the rotary tub, and when the cloth quality is soft, the water level in the rotary tub is high. Since dehydration is started at a low temperature, unbalanced rotation can be reduced regardless of cloth quality, abnormal vibration and noise can be prevented, and dehydration efficiency can be improved. Moreover, the time required from drainage to completion of dehydration can be shortened.

According to the invention of claim 4, the main drainage channel communicating with the drainage water passage portion of the rotary tank to the outside of the machine and having a drainage valve in the middle thereof, and the drainage valve from the inside of the outer tank. In the configuration in which an auxiliary drainage channel that bypasses the above and leads to the main drainage channel is provided, the drain valve is closed when the rotation speed of the rotary tank becomes equal to or higher than a predetermined rotation speed during dewatering. The water discharged into the tank can be quickly discharged, and it is possible to prevent a decrease in the rotation start-up of the rotary tank due to the accumulation of a large amount of water between the rotary tank and the outer tank.
The dehydration efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of an electrical configuration showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view of the washing machine.

FIG. 3 is a schematic side view showing a drainage route.

FIG. 4 is a plan view of an operation panel.

FIG. 5 is a flowchart showing control contents.

FIG. 6 is a diagram showing the relationship between the rotation speed of the rotary tank and the drainage flow rate.

FIG. 7 is a view corresponding to FIG. 5, showing a second embodiment of the present invention.

FIG. 8 is a view corresponding to FIG. 5 showing a third embodiment of the present invention.

[Explanation of symbols]

2 is an outer tank, 4 is a rotating tank, 4a is a dehydration hole (water passage for dehydration), 4b is a water passage (water passage for drainage), 5 is a stirrer, 1
1 is a main drain, 12 is a connecting hose (auxiliary drain), 13
Is a water level sensor (water level detection means), 22 is a water supply valve, 33 is a cloth quality designation switch (cloth quality information designation means), and 42 is a control circuit (laundry amount determination means, drainage / dehydration control means, drainage valve control means). Show.

Claims (4)

[Claims] 1. An outer tub, which is provided inside the outer tub, is substantially non-perforated except that it has a water passage for drainage at the top and a water passage for drainage at the bottom. A rotary tub that drains water through the drainage water passage part, and is rotated during dehydration to pump the internal water and discharge it from the dehydration water passage part into the outer tub, and a laundry amount determination that determines the laundry amount Means, a water level detecting means for detecting the water level in the rotary tub, and dehydration from drainage, when the amount of laundry is large, the dehydration is started at a high residual water level in the rotary tub, and the washing is performed. A washing machine for combined use of dehydration, comprising drainage / dehydration control means for starting dehydration when the residual water level in the rotary tub is low when the quantity of the product is small. 2. An outer tub, which is provided inside the outer tub, is substantially non-perforated except that it has a water passage for drainage at the top and a water passage for drainage at the bottom. A rotating tank for draining water through the drainage water passage portion, which is rotated at the time of dehydration to pump up the internal water and discharge it from the dehydration water passage portion into the outer tank, and a washing tank provided in the rotation tank. An agitator that is rotatably driven at some time, a water level detection unit that detects the water level in the rotary tank, and dehydration from the drainage.When the washing water level is high, the dehydration is performed at a high residual water level in the rotary tank. A washing machine for combined use of dewatering, comprising drainage / dewatering control means for starting dewatering when the level of residual water in the rotary tub is low when the washing water level is low. 3. An outer tub, which is provided inside the outer tub, has a dewatering water passage portion at an upper portion, and has a substantially non-perforated shape except that it has a drainage water passage portion at a bottom portion, and has an internal structure at the time of draining. The drainage water is drained through the drainage water passage, and the rotation tank that is rotated during dewatering to pump the water inside and discharge it from the dewatering water passage into the outer tank, and information on the cloth quality of the laundry are provided. Cloth quality information designating means, water level detecting means for detecting the water level in the rotary tub, and dewatering from drainage, when the qualities designated by the cloth quality information designating means are hard, the rotary tub Drainage / dehydration control means that starts dehydration when the residual water level in the inside is high, and when the designated cloth quality is soft, starts dehydration when the residual water level in the rotary tank is low Combined washing machine. 4. An outer tub, which is provided inside the outer tub, has substantially no pores except that it has a water passage for drainage at the top and a water passage for drainage at the bottom. The water is drained through the drainage water passage portion, and at the same time the water tank is rotated during dehydration to pump the internal water and discharge the water from the dehydration water passage portion into the outer tank. A main drainage channel that communicates from the water section to the outside of the machine and has a drainage valve in the middle, an auxiliary drainage channel that bypasses the drainage valve and leads to the main drainage channel from the inside of the outer tub, and A washing machine for combined use of dehydration, comprising: drain valve control means for closing the drain valve when the rotation speed of the rotary tub reaches or exceeds a predetermined rotation speed.