JP2014180406A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine which does not raise a question of increase in water consumption and prolonged operation time by a foam discharge step as much as a conventional one, and which can solve the problem about residual foam after the completion of the operation.SOLUTION: Cloth quality of laundry is determined during a washing step, and when the cloth quality is determined to be easy to absorb water, control is performed to promote water discharge from a tub in a first dewatering step after the washing step more than the time when the cloth quality is determined to be hard to absorb water.

Description

  Embodiments described herein relate generally to a washing machine.

2. Description of the Related Art Conventionally, a washing machine is provided with a tub for washing and dehydrating laundry, and a washing process for washing the laundry in the tub and a dehydration process for dehydrating the laundry by rotating the tub. Something that is supposed to be executed is provided.
In this case, during the operation, especially in the first dehydration process after the washing process, the washing liquid is agitated by the rotating tub and a lot of bubbles are generated due to an excessive amount of the detergent during the washing process. The bubbles may remain until the end of operation. In particular, in a drum type washing machine, washing is performed with a high-concentration washing liquid, so that more foam is generated when there is little dirt on the laundry or when a detergent with good foaming is used. Prone to rest.

  On the other hand, it has a bubble abnormality occurrence detecting means for detecting the occurrence of bubbles in the tank, and when bubbles are detected in the first dehydration process after the washing process, the bubbles are discharged from the tank. The one that is added and executed is provided. Although the process of discharging the bubbles is a small amount, water supply into the tank and drainage from the tank are repeated, and there is a problem that the amount of water used is increased and the operation time is prolonged.

  In addition, the following Patent Documents 1 to 4 include cloth quality determination means for determining the cloth quality of the laundry, and based on the determination result, the operation content of the subsequent dehydration process is determined according to the determined cloth quality. However, the content which deals with the above-mentioned bubble abnormality generation | occurrence | production and a bubble remainder is not described.

JP 2006-149614 A JP 2007-185357 A JP2011-239799A JP 2011-239938 A

  As described above, in the conventional apparatus, when the occurrence of foam abnormality is detected in the first dehydration process after the washing process, the process of discharging the foam from the tank is additionally performed. As a result, there was a problem that the amount of water used was increased and the operation time was prolonged.

  Accordingly, a washing machine is provided that can solve the problem of foam residue after the operation without incurring the problems of increase in the amount of water used and prolonging the operation time.

  The washing machine of the present embodiment includes a tub for washing and dehydration of the laundry, and also includes a cloth quality determination means for determining the quality of the laundry, and a washing step of washing the laundry in the tub. The dehydration process of dehydrating the laundry by rotating the tub is performed, the cloth quality of the laundry is determined during the washing process, and the cloth quality is determined to be easy to absorb water. In this case, control is performed to promote drainage from the tank in the first dehydration process after the washing process, rather than when it is determined that the cloth quality is difficult to absorb water.

The figure which shows the change of rotation of the tank in the 1st spin-drying | dehydration process of 1st Embodiment. Schematic longitudinal side view showing internal structure Schematic configuration diagram showing the heat pump along with the ventilation path Electrical configuration block diagram The figure which shows the rotation mode of the tank of a washing process The figure which shows the judgment aspect of the quality of the laundry Diagram showing control details of overall operation The figure which shows the detection mode of bubble abnormality occurrence FIG. 8 equivalent view showing the second embodiment

Hereinafter, a first embodiment applied to a drum type washing and drying machine will be described with reference to FIGS.
First, FIG. 2 schematically shows an in-machine structure 1 of a drum type washing and drying machine, and this in-machine structure 1 is mainly composed of a tub 2. The tank 2 is composed of a double tank of an outer tank 2a and an inner tank 2b. Of these, the outer tank 2a is a water tank capable of storing water, and has a horizontal axial cylindrical shape (drum-like) whose axial direction is front and rear (left and right in the figure). It is elastically supported in the form of a slope that rises forward, for example, by a pair of left and right suspensions (not shown).

  On the other hand, the inner tub 2b is a basket having a large number of small holes for water flow and ventilation (not shown) in the almost entire area of the peripheral wall. Drum shape).

A motor 3 is attached to the back of the outer tub 2a. The motor 3 is, for example, a direct current brushless motor, and is an outer rotor type. A rotating shaft 3a is inserted into the outer tub 2a. The inner tub 2b is supported in the form of a forwardly rising slope coaxial with the outer tub 2a by attaching the center of the rear part to the tip of the rotating shaft 3a of the motor 3.
As a result, the inner tub 2b is rotated directly by the motor 3, so that the inner tub 2b is a rotating tub and the motor 3 functions as a driving device for rotating the inner tub 2b. It has become.

  On the other hand, a heat exchanging unit 4 together with a fan 5 is arranged in the lower part behind the outer tub 2a. The heat exchange unit 4 includes a compressor 8 with an accumulator 7 shown in FIG. 3, a condenser 9, a constrictor 10, and an evaporator 11 disposed in a unit case 6. The heat pump (refrigeration cycle) 12 is configured by cycle connection in the order shown in FIG. In the unit case 6, a refrigerant is enclosed in the heat pump 12, and although not shown in detail, an air passage that passes through the evaporator 11 and the condenser 9 in order from the windward side, and the compressor 8 and the throttle 10 are provided. The arranged space is separated by a partition wall.

  In the upper part of the left side of the unit case 6 in FIG. 2, an air inlet 13 connected to the air passage passing through the evaporator 11 and the condenser 9 is formed, and the air inlet 13 is connected to the outer tank 2 a. One end of the exhaust duct 14 is connected. The exhaust duct 14 is arranged upward from the rear part of the outer tub 2a, and the other end is connected to an exhaust port 15 formed in the front part at the top of the outer tub 2a. In addition, a filter housing portion 16 is provided in the upper middle portion of the exhaust duct 14, and a waste thread filter 17 is housed in the filter housing portion 16.

The fan 5 includes a blower blade 5b disposed inside the casing 5a, and a motor 5c that rotationally drives the blower blade 5b, as shown in FIG. 3, is disposed outside the casing 5a. The unit case 6 is arranged on the right side in FIG. 2, and the inlet portion (not shown) of the casing 5 a is connected to the outlet 11 (not shown) of the air passage passing through the evaporator 11 and the condenser 9 of the unit case 6. Communicating with
The casing 5a has an outlet portion 5d at the top, and the outlet portion 5d is connected to the lower end portion of the air supply duct 18, and the upper end portion of the air supply duct 18 is connected to the upper portion of the rear end portion of the outer tub 2a. It is connected to the air supply port 19 formed in the above.

  The exhaust duct 14, the air path passing through the evaporator 11 and the condenser 9 of the unit case 6, the fan 5 (casing 5 a), and the air supply duct 18, the exhaust port 15 and the air supply port 19 of the outer tub 2 a Is formed outside the inner tub 2b. FIG. 3 schematically shows the ventilation path 20 together with the heat pump 12.

  FIG. 4 shows a control device 21, which is arranged inside the outer box and is made up of, for example, a microcomputer, and controls the overall operation of the washing / drying machine. It is designed to function as a means. The control device 21 receives various operation signals from an operation unit 22 including various operation switches on an operation panel (not shown) for a user to perform operations related to the operation of the washing and drying machine. A water level detection signal is input from a water level sensor 23 provided to detect the water level in the outer tank 2a, and rotation detection is performed from a rotation sensor 24 provided to detect the rotation of the motor 3 (and hence the rotation of the inner tank 2b). A signal is input, and a current detection signal is input from a current sensor 25 provided to detect a current flowing through the motor 3.

  Accordingly, the control device 21 drains water from the water supply valve 26 provided to supply water into the outer tub 2a, the motor 3, and the outer tub 2a based on those inputs and a previously stored control program. The drain valve 27, the compressor 8, and the fan 5 (motor 5 c) provided as described above are driven and controlled via a drive circuit 28.

Next, the operation of the washing / drying machine having the above configuration will be described.
In the washing and drying machine having the above-described configuration, when a standard operation course is started, the laundry amount is first determined. The determination of the amount of cloth is performed, for example, by rotating the inner tub 2b to a predetermined rotational speed, the time required for the rotation, and then stopping the driving of the inner tub 2b to rotate the inner tub 2b by inertia, thereby The amount of laundry cloth is determined by the rotational load of the motor 3 from the time required for the rotational speed 2b to drop to a predetermined rotational speed. Accordingly, at this time, the rotation sensor 24 and the control device 21 function as a cloth amount determination unit.

  Next, the water level in the washing (washing and rinsing) process is set according to the determination result of the cloth amount. Then, as shown in FIG. 7, “washing”, “drainage”, “first dehydration”, “first rinse”, “drainage”, “second dehydration”, “second rinse”, “drainage”, “ In the first "washing" process, the water supply valve 26 is opened to supply water from the outer tank 2a to the inner tank 2b up to the set water level. Then, the detergent set in the water supply channel is put in, and then the inner tub 2b is alternately rotated in both forward and reverse directions at a low speed of about 50 [rpm] as shown in FIG. I do.

  During this “washing” process, the quality of the laundry is determined. The determination of the cloth quality is performed by, for example, determining the magnitude of the torque fluctuation of the motor 3 for each rotation when the inner tub 2b is rotated in the forward direction for several minutes from the q axis of the current detected by the current sensor 25. The current is calculated by the control device 21 and viewed. Accordingly, at this time, the current sensor 25 and the control device 21 function as cloth quality determination means. In general, the parallel direction (rotational direction) is referred to as a d-axis current and the perpendicular direction is referred to as a q-axis current with respect to the magnetic flux generated by the S and N poles of the motor 3 that rotates the inner tank 2b. Since the q-axis current affects the rotational torque of the motor 3, if the torque fluctuation is large, the rotational torque increases and the q-axis current increases.

  As for the cloth quality of the laundry, if the proportion of cotton in the laundry is large and the proportion of chemical fiber is small, it becomes easy to absorb water, so that the total moisture content of the laundry increases and the torque fluctuation of the motor 3 is large. Become. On the contrary, if the ratio of cotton in the laundry is small and the ratio of synthetic fiber is large, it becomes difficult to absorb water, so that the total water content of the laundry is reduced and the fluctuation of the torque of the motor 3 is reduced.

The change in the torque of the motor 3 can be determined from the q-axis current to determine the quality of the laundry, and FIG. 6 shows an example of the determination. In this case, if the q-axis current is larger than the determination threshold value for the cloth quality, it is determined that the cloth quality is easy to absorb water (the ratio of cotton in the laundry is large and the ratio of synthetic fibers is small). If the q-axis current is smaller than the quality judgment threshold, it is judged that the fabric quality is difficult to absorb water (the ratio of cotton in the laundry is small and the ratio of synthetic fibers is large).

  In accordance with the determination result, in this case, although not shown, the control device 21 sets and executes the operation content of the washing process, sets the operation content of the next dehydration process, and performs the drying process. Set the operation details.

In the “drainage” process, the drain valve 27 is opened to drain water from the outer tank 2a and the inner tank 2b.
In the subsequent “first dehydration” step, the laundry is centrifugally dehydrated by rotating the inner tub 2b in one direction at a set speed. FIG. 1 shows a change in the rotation of the inner tank 2b in this dehydration process. In the first stage (low-speed rotating shelf) of increasing the rotation of the inner tank 2b stepwise, 100 to 170 [rpm]. At this time, if it is determined in the previous cloth quality determination that the cloth quality is likely to absorb water, it is determined that the cloth quality is difficult to absorb water for, for example, 40 seconds. For example, this low-speed rotation is performed for 20 seconds.

  That is, when it is determined that the cloth quality of the laundry is easy to absorb water, the first time after the washing process is compared to when it is determined that the cloth quality of the laundry is difficult to absorb water. When the low speed rotation time of the inner tub 2b in the dehydration process is controlled, and it is determined that the cloth quality is easy to absorb water, it is determined that the cloth quality is difficult to absorb water. Control is performed to promote drainage from the inner tub 2b in the first dehydration process after the washing process, compared to when the washing process is performed.

  In the next stage (dehydrated foam detection shelf) in which the rotation of the inner tank 2b is gradually increased, the bubbles generated in the outer tank 2a and the inner tank 2b are detected. This bubble detection is also performed by calculating the q-axis current out of the current detected by the current sensor 25 with the control device 21, and abnormally many bubbles are generated in the outer tank 2a and the inner tank 2b. In this case, the rotation of the inner tank 2b is hindered by bubbles and is difficult to rotate, so that the q-axis current is increased by increasing the rotational torque.

  FIG. 8 shows a threshold value (for example, 1.33 [V]) indicating an abnormal bubble generation level with respect to the q-axis current, and the laundry cloth quality is easy to absorb water and not easy to absorb water. Even in this case, when the q-axis current exceeding this threshold is calculated, it is determined that the occurrence of bubble abnormality has been detected. Therefore, at this time, the current sensor 25 and the control device 21 function as bubble abnormality occurrence detection means, and control the dehydration operation at this stage according to the detection result.

  FIG. 7 shows the contents of the control. When an abnormal bubble generation (foam NG) is detected at this stage of the “first dehydration” process, the dehydration operation is interrupted and the laundry cloth determined previously is displayed. It is determined whether or not the quality is easy to absorb water (step S1). If it is determined in this step S1 that the cloth quality of the laundry is likely to absorb water (YES), the “foam discharge” process is executed (step S2). This “foam discharge” process is a process in which a small amount of water is supplied into the outer tank 2a and drained from the tank 2a. Thereafter, the process returns to the “first dehydration” step, and the above steps S1 and S2 are repeated until the abnormal bubble generation (bubble NG) is not detected again.

  On the other hand, if it is determined in step S1 that the cloth quality of the laundry is not easy to absorb water (NO: it is difficult to absorb water), the number of abnormal bubble occurrences (bubble NG) is 2 or less. It is determined whether or not there is (step S3), and if it is determined that it is twice or less (YES), the process returns to the “first dehydration” step.

In addition, even if the occurrence of foam abnormality (foam NG) is detected in the returned “first dehydration” process, if the cloth quality of the laundry is difficult to absorb water, it is less than twice in step S3 (YES). Since the determination is made, the process returns to the “first dehydration” process as described above.
Furthermore, if the occurrence of foam abnormality (foam NG) is detected in the returned “first dehydration” process, the cloth quality of the laundry is difficult to absorb water, and in this case, it is not less than twice in step S3 ( NO: 3 times or more), the process proceeds to step S2 to execute the “bubble discharge” process.

  That is, in this case, if the laundry cloth is easy to absorb water, the “foam discharging” step is repeatedly executed until no abnormal foam is detected in the “first dehydration” step. If the water quality is difficult to absorb, return to the “first dehydration” process without performing the “foam discharge” process until the occurrence of foam abnormality is detected twice in the “first dehydration” process. If the occurrence is detected three or more times, the “foam discharging” process is repeatedly executed until the occurrence of the abnormal bubble is not detected in the “first dehydration” process. When it is easy to absorb water, when an abnormality of foam is detected in the first dehydration process after the washing process, an additional process of discharging the foam from the tank 2 is executed, and the laundry cloth If the quality is difficult to absorb, the first removal after the washing process When the abnormality occurrence of bubbles is detected in the step, and suspend dehydration of the laundry, it is intended to control to perform a dehydration again.

  In the final stage (highest rotation shelf) of gradually increasing the rotation of the inner tub 2b, when it is determined that the cloth quality of the laundry is difficult to absorb water, the maximum rotation speed of the inner tub 2b is increased. In contrast to 950 [rpm], when it is determined that the laundry cloth is easy to absorb water, the maximum rotation speed of the inner tub 2b is 1300 [rpm], that is, The first dehydration process after the washing process when the laundry cloth quality is determined to be easy to absorb water than when the laundry cloth quality is determined to be difficult to absorb water The maximum rotation speed of the inner tank 2b is controlled to be increased.

  The subsequent “first rinsing” process is to wash the laundry by rotating the inner tub 2b alternately in both forward and reverse directions at low speed after water supply to the set water level, as in the “washing” process. . The “drainage” process is the same as the drainage process, and the “second dehydration” process performs centrifugal dehydration of the laundry by gradually increasing the rotation of the inner tub 2b in the same manner as the “first dehydration” process. The “second rinsing” process is the same as the “first rinsing” process, the “drainage” process is the same as the drainage process, and the “final dehydration” process is the “first dehydration” process. Similarly to the “second dehydration” step, the rotation of the inner tub 2b is increased stepwise to perform centrifugal dehydration of the laundry.

  In the last “drying” step, the fan 5 is driven while the inner tub 2b is alternately rotated in both forward and reverse directions at a set low speed. Thereby, the air in the inner tub 2b passes through the exhaust duct 14 from the exhaust port 15 of the outer tub 2a and the unit case 6 in the heat exchange unit 4 by the operation of the fan 5 while the clothes after the final dehydration are stirred. From the air inlet 13 through the air passage through the evaporator 11 and the condenser 9 in the unit case 6, further through the fan 5, from the outlet 5 d of the fan 5 through the air supply duct 18, and through the outer tank 2 a. Is circulated through the air supply port 19 into the outer tank 2a and returned to the inner tank 2b.

  In this drying process, the compressor 8 of the heat pump 12 is driven. As a result, the refrigerant sealed in the heat pump 12 is compressed by the compressor 8 to become a high-temperature and high-pressure refrigerant, and the high-temperature and high-pressure refrigerant flows into the condenser 9, and the evaporator 11 and the condenser 9 in the unit case 6 are passed through. Exchanges heat with the air in the air passage. As a result, the air in contact with the condenser 9 in the unit case 6 is heated, and conversely, the temperature of the refrigerant is lowered and liquefied. Next, the liquefied refrigerant passes through the throttle 10 and is decompressed, and then flows into the evaporator 11 and vaporizes. Thereby, the evaporator 11 cools the air which contacts the evaporator 11 in the unit case 6. The refrigerant that has lost its heat by cooling the air in contact with the evaporator 11 then returns to the compressor 8.

  As a result, the air that has flowed into the air passage through the evaporator 11 and the condenser 9 in the unit case 6 in the ventilation passage 20 from the inside of the outer tub 2a by the operation of the fan 5 is cooled by the evaporator 11 and dehumidified. Then, it is heated by the condenser 9 and warmed. Then, the warm air passes through the air supply duct 18 and is blown into the outer tank 2a from the air supply port 19 of the outer tank 2a, and is sent into the inner tank 2b.

The warm air sent into the inner tub 2b comes into contact with the clothes in the inner tub 2b to remove its moisture, and then the evaporator in the unit case 6 from the exhaust port 15 of the outer tub 2a through the exhaust duct 14. 11 and the air passage through the condenser 9.
In this way, the air circulates between the air path passing through the evaporator 11 and the condenser 9 in the unit case 6 and the inside of the outer tub 2a having the inner tub 2b, so that the laundry in the inner tub 2b is Dried.

  As described above, in the present embodiment, the cloth quality of the laundry is determined during the washing process, and when it is determined that the cloth quality is easy to absorb water, it is determined that the cloth quality is difficult to absorb water. Rather than when it is, control to promote drainage from the tank 2 in the first dehydration process after the washing process is performed.

  If the laundry cloth is easy to absorb water, the laundry contains a large amount of detergent liquid and the amount of detergent liquid discharged from the laundry is large. In such a case, the washing process can be performed by controlling drainage from the tank 2 in the first dehydration process after the washing process, rather than when it is determined that the cloth quality is difficult to absorb water. In the subsequent first dehydration step, the amount of foam generated by the detergent liquid being stirred by the rotation of the inner tank 2b can be reduced. As a result, it is possible to eliminate or reduce the need for additional execution of the “foam discharge” process, thereby increasing the amount of water used and extending the operating time due to the additional execution of the “foam discharge” process. The problem of remaining bubbles after the operation can be solved without inviting as much as before.

  Particularly in this embodiment, when it is determined that the cloth quality of the laundry is easy to absorb water in order to promote drainage from the tank 2 in the first dehydration process after the above-described washing process, Control is performed to increase the low-speed rotation time of the tank in the first dehydration process after the washing process, compared to when it is determined that the laundry fabric is less likely to absorb water. In particular, the generation of bubbles increases as the rotational speed of the inner tub 2b increases, and it is controlled to increase the low-speed rotation time of the tub in the first dehydration process after the washing process. Therefore, it is possible to promote the discharge of the detergent liquid from the tank 2 while suppressing the generation of bubbles, and more reliably eliminate or reduce the need for additional execution of the “bubble discharge” process. As a result, the remaining bubbles after the end of operation can be ensured without causing the problems of increased water consumption and prolonged operation time due to the additional execution of the “bubble discharge” process. The problem can be solved.

  In the present embodiment, when it is determined that the laundry cloth is easy to absorb water, the tank 2 is detected when the occurrence of foam abnormality is detected in the first dehydration process after the washing process. In the first dehydration process after the washing process, when it is determined that the process of discharging the foam from the inside ("foam discharging" process) is performed and it is determined that the cloth quality of the laundry is difficult to absorb water, When the occurrence of foam abnormality is detected, the dehydration of the laundry is temporarily suspended and the dehydration is controlled again.

  When the cloth quality of the laundry is difficult to absorb water, the amount of the laundry containing the detergent liquid is small, and the amount of the detergent liquid discharged from the laundry is also small. For this reason, even if rotation of the inner tub 2b after detecting foam in the first dehydration process after the washing process, the washing liquid can be discharged by the dehydration operation without being disturbed by further generation of foam. It is believed that there is. Therefore, even when the occurrence of foam abnormality is detected in the first dehydration process after the laundry process, the dehydration of the laundry is temporarily suspended and the dehydration is performed again without performing the additional process of discharging the foam. After that, the dehydration operation may be continued without detecting the occurrence of foam abnormalities.In this case, the problem of increased water consumption and prolonged operation time due to the additional execution of the `` bubble discharge '' process Without inviting, the problem of remaining bubbles after the operation can be solved.

  Further, in this embodiment, when it is determined that the laundry cloth is easy to absorb water, the laundry is more difficult to absorb than after the washing process. In the first dehydration process, the maximum rotation speed of the inner tank 2b is increased.

  As described above, if the laundry cloth is easy to absorb water, the laundry contains a large amount of detergent liquid and the amount of the detergent liquid discharged from the laundry is also large. In such a case, even if the process of discharging the bubbles from the tank 2 is additionally performed, the bubbles may not be sufficiently discharged, and the remaining bubbles after the operation may be generated. For this reason, when it is determined that the laundry cloth is easy to absorb water, the first dehydration after the washing process is performed more than when the laundry cloth is determined to be difficult to absorb water. By controlling to increase the maximum rotation speed of the inner tub 2b in the stroke, more detergent liquid can be discharged from the laundry, and foam residue after the operation can be prevented.

In contrast to this, FIG. 9 shows the second embodiment, and only the parts different from the first embodiment will be described.
In this case, the cloth quality of the laundry is likely to absorb water at the threshold value at which the bubble abnormality occurrence detection means detects the occurrence of the foam abnormality when it is determined that the cloth quality of the laundry is difficult to absorb water. It is set higher than the threshold value when it is determined to be a thing.

  Specifically, when the cloth quality of the laundry is determined to be easy to absorb water, the bubble abnormality occurrence detecting means detects the occurrence of the bubble abnormality, as shown in FIG. For example, when it is determined that the cloth quality of the laundry is difficult to absorb water while it is set to 1.33 [V], the threshold value is set to 1.40, for example, as shown in FIG. [V] is set.

  By doing this, when the laundry fabric is difficult to absorb water (it is difficult for foam to be generated), it is less likely to detect the occurrence of foam abnormalities, thus adding a process for discharging foam. Being able to perform dehydration operation without executing it will result in problems of remaining foam after the end of operation without causing the problems of increased water consumption and prolonged operation time due to the additional execution of the `` bubble discharge '' process. Can be eliminated.

  The washing machine described above is not limited to the above-described embodiment. In particular, the washing machine as a whole is not limited to the drum type, and is also a vertical washing machine having a tub in a vertical axis. The present invention can be applied in the same manner, and may be implemented with appropriate modifications within a range not departing from the gist, such as not having a drying function.

  In addition, although embodiments of the present invention have been described, these embodiments are presented as examples, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 2 is a tank, 3 is a motor, 21 is a control device (cloth quality determination means, bubble abnormality occurrence detection means), and 25 is a current sensor (cloth quality determination means, bubble abnormality occurrence detection means).

Claims (5)

In addition to having a tub for washing and dehydrating laundry, it also has cloth quality judging means for judging the quality of the laundry,
In a washing machine that executes a washing process of washing laundry in the tub and a dehydration process of dehydrating the laundry by rotating the tub,
When the cloth quality of the laundry is determined during the washing process and it is determined that the cloth quality is easy to absorb water, the washing is performed more than when it is determined that the cloth quality is difficult to absorb water. A washing machine that performs control for promoting drainage from the tank in the first dehydration process after the process.   When it is determined that the laundry cloth is easy to absorb water, the tank in the first dehydration process after the washing process is more than when it is determined that the laundry cloth is difficult to absorb water. 2. The washing machine according to claim 1, wherein control is performed to increase the low-speed rotation time.   When there is a foam abnormality detection means for detecting the occurrence of foam abnormality in the tub, and it is determined that the quality of the laundry cloth is easy to absorb water, the abnormality of the foam in the first dehydration process after the washing process When an occurrence is detected, an additional process of discharging foam from the tank is performed, and if it is determined that the laundry fabric is difficult to absorb water, the first dehydration after the laundry process The washing machine according to claim 1 or 2, wherein when the occurrence of foam abnormality is detected in the process, the dehydration of the laundry is temporarily interrupted and the dehydration is executed again.   When it is determined that the cloth quality of the laundry is difficult to absorb water, the bubble abnormality occurrence detection means detects the occurrence of the bubble abnormality, and the laundry cloth quality is likely to absorb water. The washing machine according to any one of claims 1 to 3, wherein the washing machine is set to be higher than a threshold value when judged.   When it is determined that the laundry cloth is easy to absorb water, the tank in the first dehydration process after the washing process is more than when it is determined that the laundry cloth is difficult to absorb water. The washing machine according to any one of claims 1 to 4, wherein control is performed to increase the maximum rotation speed of the washing machine.

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