JP2007050153A - Washing/drying machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize excellent drying finish with less wrinkles and with an airly feeling; and to suppress power consumption while maintaining high drying efficiency. <P>SOLUTION: While drying is performed by alternately executing the tub rotation of rotating a washing and dewatering tub at a high speed and the blade rotation of agitating laundry by rotating a pulsator, the laundry is positively dried with high efficiency in a tub rotation centralized operation [ii] wherein the time of the tub rotation in one cycle is longer than the time of the blade rotation; then the operation is shifted to a blade rotation centralized operation [iii] wherein the time of the blade rotation in one cycle is longer than the time of the tub rotation when the laundry is dried to some extent; hot air is applied while agitating the laundry; and an emphasis is put on the finish of smoothing wrinkles or the like. Since the effect of supplying the hot air is low in the second half of the tub rotation in each cycle during the tub rotation centralized operation [ii], useless power consumption is reduced by temporarily turning a heater off. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a washing and drying machine, and more particularly to control during a drying operation of a vertical (spiral) washing and drying machine including a bottomed cylindrical laundry dewatering tub and rotary blades.

  2. Description of the Related Art In recent years, laundry dryers that integrate a washing machine and a clothes dryer to automatically wash and dry clothes have been spreading. Conventionally, such a washing and drying machine has been mainly a drum type, but recently, various types of washing and drying machines are commercially available even in a so-called spiral type. Hereafter, a washing dryer having a spiral type in which a bottomed cylindrical laundry dewatering tub is rotatably arranged around a vertical or inclined axis will be described.

  In such a washing and drying machine, conventionally, when drying, the laundry dewatering tub is rotationally driven at a high rotational speed so that the laundry is stuck to the inner peripheral surface of the laundry dewatering tub by centrifugal force. However, it is known that warm air is supplied into the washing and dewatering tank. However, in such a method, among the laundry that is in a stacked state on the inner peripheral surface of the laundry dewatering tub, the laundry located on the center side of the laundry dewatering tub is exposed to strong warm air and drying proceeds. There is a problem that warm air is difficult to reach the laundry located on the inner peripheral surface side of the laundry dewatering tub, and the drying efficiency is poor as a whole and the drying time is long. Further, when such drying is performed, there is a problem that wrinkles are easily generated in the laundry and there are many unevennesses in drying.

  With respect to such problems, in the washing and drying machine described in Patent Document 1, the laundry is rotated by rotating the laundry dewatering tank at a high speed and the rotating blades (pulsator) provided on the inner bottom of the laundry dewatering tank are reversed left and right. By alternately performing the loosening operation of stirring the laundry, drying is promoted while changing the position of the laundry. Furthermore, in another laundry dryer described in the same document, in order to improve the finished quality of the laundry, the drying operation by the high-speed rotation of the laundry dewatering tank and the first unwinding operation by the rotation of the rotor blades are alternately performed. After the laundry is dried to a predetermined degree after execution, only the second unwinding operation by the rotation of the lower-speed rotating blade is appropriately performed.

  Usually, the drying progresses faster when the laundry dewatering tub rotates at a higher speed than when the rotor blades rotate. Therefore, if importance is attached to the drying efficiency, the drying operation by the high speed rotation of the laundry dewatering tub and the first rotation by the rotation of the rotor blades are performed. It is preferable to lengthen the period in which the loosening operation is alternately performed to shorten the time of the second loosening operation. However, when the laundry is dried, wrinkles are likely to occur during the high-speed rotation of the laundry dewatering tank, and the wrinkles once attached are difficult to remove, so the finish of the laundry tends to deteriorate. On the other hand, if the period for alternately performing the drying operation by the high-speed rotation of the washing and dewatering tank and the first unwinding operation by the rotation of the rotor blades is shortened, the drying efficiency is deteriorated. As described above, the conventional drying method has a problem that it is difficult to balance the drying efficiency and the finishing quality.

  In general, in the case of a washer / dryer, the power consumption of the heating means (heater) at the time of drying is the largest among the total power consumption. However, there is a problem that power consumption is large. In recent years, from the viewpoint of environmental protection such as prevention of global warming, there is a strong demand for reducing the power consumption of such home appliances. In the case of a washing dryer, the power consumption during drying is maintained while keeping the drying efficiency as much as possible. How to reduce the amount is a big issue.

JP-A-11-70288

  The present invention has been made to solve these problems, and the object of the present invention is to efficiently produce laundry while suppressing wrinkles and fabric damage and achieving a good finish with a soft feeling. It is in providing the washing-drying machine which can be dried.

  Another object of the present invention is to provide a laundry dryer that can efficiently dry laundry while suppressing power consumption as much as possible.

In order to solve the above-mentioned problems, the present invention comprises a laundry dewatering tub that also serves as a drying tub that is rotatably provided in an outer tub, and a rotary blade that is rotatably provided at the inner bottom of the laundry dewatering tub. A drive source for rotationally driving the washing / dehydrating tub and the rotating blades, a blade rotation mode in which only the rotating blades are rotated by a driving force by the driving source, and the rotating blades and the washing / dehydrating bath by the driving force. In a washing and drying machine comprising: a drive switching means for switching between a tank rotation mode for rotating the tank integrally; and a hot air supply means comprising a blowing means and a heating means for sending warm air into the washing and dewatering tank,
When drying the laundry in the washing and dewatering tub mainly using the warm air from the warm air supply means, a first period of rotational driving in the blade rotation mode and rotational driving in the tank rotation mode are performed. An operation control means for controlling the drive source and the drive switching means to repeat this with a second period to be performed as one cycle, and centering on the tank rotation in which the second period in one cycle is longer than the first period After performing the drying in the tank rotation center operation, the operation control means for performing the drying in the blade rotation center operation centered on the blade rotation in which the first period in one cycle is longer than the second period is provided. It is characterized by.

  In the washing / drying machine according to the present invention, the laundry is agitated by the rotating blades in the first period, that is, the period in which the rotating blades are rotationally driven, and the second period, that is, the laundry dewatering tub and the rotating blades are integrally rotated. During the period, the laundry is attached to the inner peripheral surface of the laundry dewatering tub by centrifugal force and rotates integrally with the tub. In both the tank rotation center operation and the blade rotation center operation, drying proceeds by alternately performing the blade rotation and the tank rotation, but the tank rotation is the center until an appropriate point in the middle of the operation. After that, blade rotation is the center. Drying with emphasis on the efficiency of drying in the center rotation of the tub, and after that the laundry has dried to some extent, with emphasis on good finishing to stretch wrinkles and give a soft feeling by rotating the wing rotation center I do.

  In the initial stage of drying, the laundry contains a lot of moisture, so the laundry is difficult to dry. Since an air flow is generated, strong wind hits the inner surface of the laundry stuck to the inner peripheral surface of the laundry dewatering tub, and moisture in that portion is quickly removed. At this time, the inside of the laundry and the part that is in close contact with the inner peripheral surface of the laundry dewatering tub are not dry well, but by putting the wing rotation in between, the laundry is attached to the laundry dewatering tub when the tub is rotating Can be changed, and extreme unevenness of dryness can be suppressed. In this case, the wing rotation may be performed so as to prompt the upper and lower sides of the laundry to be swapped, and it is not necessary to completely loosen each piece of the laundry.

  When the entire laundry becomes dry to some extent, the operation shifts from the tank rotation center operation to the blade rotation center operation, and the drying is performed while stirring the laundry by the rotation of the rotor blades, that is, moving the laundry. In the blade rotation, there is almost no air flow generated by the rotation of itself as in the case of the tank rotation, so the wind hitting the laundry is only due to the blowing means. For this reason, although the drying progresses slowly, the wind enters the inside of the laundry, and the laundry is subjected to a force that expands and contracts almost continuously, so that the wrinkles are stretched and the air enters the gaps between the fibers, giving a soft feeling. Get out. However, when the time for stirring the laundry by rotating the wings becomes longer, the laundry tends to be entangled with each other and become a dango shape. Therefore, by putting a short tank rotation between the blade rotations, the laundry can be peeled off one by one by centrifugal force, and the tangle of the laundry can be reduced. In addition, wrinkles can also be suppressed by suppressing the tank rotation in a short time.

  Thus, according to the washing and drying machine according to the present invention, by combining the tank rotation center operation and the blade rotation center operation, to achieve high drying efficiency and prevent the drying time from becoming extremely long, and It is possible to suppress wrinkles and drying unevenness of the laundry as much as possible, and to achieve a good dry finish having a soft feeling.

  In the washing / drying machine according to the present invention, the operation control means may perform a second operation at the time of the tank rotation center operation in the tank rotation mode before drying in the tank rotation center operation when drying the laundry. It is preferable to perform a dehydration drying operation in which the rotational drive is performed at a rotational speed higher than the rotational speed of the washing dewatering tank and the rotary blades during the period.

  Here, the rotational speed of the laundry dewatering tank during the dehydration drying operation may be approximately the same as the rotational speed of the laundry dewatering tank during the dewatering process (intermediate dewatering or final dewatering) during the washing operation. That is, in this configuration, by performing the dehydration drying operation prior to the drying by the tank rotation center operation, the water soaked in the laundry is further squeezed out by the centrifugal force to increase the dehydration rate. The moisture on the surface of the laundry located on the center side of the laundry dewatering tank is removed by a strong air flow. As a result, the amount of moisture contained in the laundry can be reduced before the tank rotation center operation is started. For example, the time for operating the heating means during the subsequent drying operation can be shortened to reduce the power consumption. it can.

  Further, in this case, when the dehydration drying operation is performed, the operation control means sends cold air to the laundry dewatering tub by the blowing means without operating the heating means at the initial stage, and operates the heating means in the middle. It is preferable that the warm air be sent to the washing and dewatering tank.

  According to this configuration, although the amount of power consumption is increased by operating the heating means, the laundry is switched to the warm air after the effect of dehydration and the effect of drying the surface of the laundry by the cold air is almost lost. Drying of the surface can be further promoted, contributing to improvement in drying efficiency.

  In the washing / drying machine according to the present invention, the operation control unit performs drying in the blade rotation center operation, and then sends cold air to the washing / dehydrating tank by the blowing unit without operating the heating unit. It is preferable to perform a cool-down in which a relatively low-speed rotation drive in the blade rotation mode and a relatively high-speed rotation drive in the tank rotation mode are alternately repeated.

  According to this structure, the temperature of the laundry which became hot at the time of drying can be reduced uniformly. In addition, the temperature in the laundry and the laundry dewatering tub can be quickly lowered as compared with the case of natural cooling, and the user can take out the dried laundry without waiting much. Furthermore, while cooling the hot laundry, you can loosen the twist and entanglement of the laundry and give a softer feeling.

  Further, as one aspect of the washing and drying machine according to the present invention, the operation control unit is configured to provide a period for temporarily stopping or weakening the heating by the heating unit at least during execution of the tank rotation center operation. it can.

  Specifically, a period during which heating by the heating means is temporarily stopped or weakened can be provided in the second half of the second period within one cycle in the tank rotation center operation.

  As described above, when the tub rotates, the inner surface of the laundry attached to the inner peripheral surface of the laundry dewatering tub dries, but if the temperature of the laundry is increased to some extent by supplying hot air, Even if the temperature of the wind that hits falls, it does not affect the progress of drying so much. Further, at the end of the rotation of the tub, the rotation speed of the laundry dewatering tub decreases, but the temperature of the wind hitting the laundry hardly affects the progress of drying. Therefore, according to the above configuration, by stopping or weakening the heating means in such a period that even if the heating means is stopped or the output is weakened during the tank rotation center operation, the drying efficiency is not significantly affected. , Wasteful power consumption can be suppressed and total power consumption can be reduced.

  In addition, as one aspect of the washing and drying machine according to the present invention, the washing and drying machine includes a temperature detecting unit that detects a temperature reflecting the temperature of the air in the washing and dewatering tub, and the operation control unit is configured to perform the tub rotation center operation. The temperature detected by the temperature detecting means is monitored, and at least when the temperature rises by a predetermined value or more than when the tank rotation center operation is started, the blade rotation center operation may be performed.

  Moreover, as another aspect of the washing and drying machine according to the present invention, the washing and drying machine includes a temperature detecting unit that detects a temperature reflecting the temperature of the air in the washing and dewatering tub, and the operation control unit is configured to perform the tub rotation center operation. The temperature detected by the temperature detection means may be monitored, and at the time when the temperature rises to a predetermined temperature determined in advance according to the load amount of the laundry, the blade rotation center operation may be performed. Of course, the structure of this aspect and the structure of the said aspect can also be used together.

  In the above two aspects, the predetermined value and the predetermined temperature are appropriately determined, so that the total drying efficiency can be made the best. Specifically, assuming a rated drying capacity of about 4 to 5 kg in this type of washing and drying machine, when the time ratio between the tank rotation center operation and the blade rotation center operation as described above is about 3: 1 In addition, the drying efficiency is the best, but a state close to such time distribution can be realized.

  In addition, in the washing and drying machine of those aspects, basically, it may be determined that the drying of the laundry is finished when the detected temperature rises to a predetermined temperature when the blade rotation center operation is performed. The operation control means monitors the temperature detected by the temperature detection means at the time of execution of the blade rotation center operation, and is at least a predetermined value higher than the detection temperature after a predetermined time has elapsed since the start of the tank rotation center operation immediately before that. It is good also as a structure which judges that the drying of the laundry was complete | finished at the time of rising.

  According to this structure, even if it is especially a small load, it will not be overdried and the cloth damage of the laundry can be prevented.

  In particular, when there is a large amount of load or when laundry with properties that are difficult to dry is accommodated, even when it is determined that the drying is finished as described above, drying unevenness may remain. Therefore, the operation control means is configured to stop the heating means after continuing the blade rotation center operation for an appropriate time from the time when it is determined that the drying of the laundry has been completed, thereby further reducing unevenness in drying. Can be reduced.

The cool-down after the drying operation described above can be applied without depending on the control during the drying operation as described above. That is, another laundry dryer according to the present invention includes a laundry dewatering tub that also serves as a drying tub that is rotatably provided in the outer tub, and a rotary blade that is rotatably provided at the inner bottom of the laundry dewatering tub. A drive source for rotationally driving the washing / dehydrating tub and the rotating blades, a blade rotation mode for rotating only the rotating blades by a driving force by the driving source, and the rotating blades and the washing / dehydrating bath by the driving force. In a washing and drying machine comprising: a drive switching means for switching between the tank rotation modes to rotate integrally; and a hot air supply means comprising a blowing means and a heating means for sending warm air into the washing and dewatering tank;
After performing a drying operation for drying the laundry in the laundry dewatering tub mainly using the warm air supplied from the hot air supply means, air is supplied to the laundry dewatering tub by the blowing means without operating the heating means. An operation control means for performing a cool-down for controlling the drive source and the drive switching means to alternately and repeatedly perform the rotation drive in the blade rotation mode and the rotation drive in the tank rotation mode while feeding. It is a feature.

  According to this structure, the temperature of the laundry which became hot at the time of drying can be reduced uniformly by the combination of tank rotation and blade rotation. In addition, the temperature in the laundry and the laundry dewatering tub can be quickly lowered as compared with the case of natural cooling, and the user can take out the dried laundry without waiting much. Furthermore, while cooling the heated laundry, the twist and entanglement of the laundry can be loosened to give a softer feeling.

  Hereinafter, an embodiment of a washing and drying machine according to the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of the washing / drying machine according to the present embodiment, FIG. 2 is a top plan view showing a state where the rear decorative cover and the upper lid of the washing / drying machine of the present embodiment are removed, and FIG. It is a schematic side sectional view showing the internal configuration of the machine.

  First, the overall configuration of the washing / drying machine of this embodiment will be described. As shown in FIG. 1, the outer box 1 that forms the outer shape of the washing and drying machine has a substantially rectangular parallelepiped box shape as a whole, a pedestal part 2 having legs formed at the four corners of the bottom surface, both side surfaces and the front surface. A front side plate 3 having a U-shaped cross-section formed integrally, a top plate 4 mounted so as to close the top opening of the front side plate 3, and a rear plate 5 covering the back side of the front side plate 3. Including.

  As shown in FIG. 2, the top plate 4 is divided into three in the front-rear direction, that is, a front section 4a, a central section 4b, and a rear section 4c, and a laundry input port 6 is provided in the central section 4b. In order to open and close the laundry input port 6, a bi-foldable upper lid 7 that rotates about a horizontal axis in the lateral direction is attached. The upper lid 7 can be locked in a closed state by an upper lid locking mechanism 16 disposed at the right front portion of the upper surface plate 4. On the other hand, each of the front section 4a and the rear section 4c is formed with a recess for storing a predetermined part, and the front decorative cover 10 on which the operation panel is printed is formed on the upper surface of the recess of the front section 4a. The upper surface and the back surface of the recess of the rear section 4 c are covered with the rear decorative cover 11.

  A water supply hose connection port 12 is provided in the middle of the rear part of the rear decorative cover 11 to be slightly recessed and connected to a water supply hose, and a bath water absorption hose connection port 13 is provided in front of the water supply hose connection port 13. On the left side of the water supply hose connection port 12, when another clothes dryer is installed in the upper space of the present laundry dryer using an installation stand, a dehumidified water drain port is connected to the clothes dryer's dehumidified water discharge hose. 14 is provided.

  As shown in FIG. 3, a bottomed cylindrical outer tub 20 is suspended inside the outer box 1 by a plurality of springs (not shown) so as to freely swing freely. A bottomed cylindrical laundry dewatering tub 21 also serving as a drying tub is rotatably supported around a main shaft 22. A pulsator (rotary blade) 23 for agitating the laundry is disposed at the inner bottom of the laundry dewatering tank 21, and the pulsator 23 is rotatable by a drive shaft 24 inserted into the main shaft 22. Below the bottom surface of the outer tub 20, a direct drive main motor 25 corresponding to a drive source in the present invention, a power switching clutch 261 corresponding to a drive switching means in the present invention, a speed reduction mechanism, a band brake, and the like are included. A power transmission mechanism 26 is installed.

  The clutch 261 releases the connection between the main shaft 22 and the drive shaft 24 so that only the pulsator 23 is rotated in the washing operation and the rinsing operation by the operation of the torque motor 27, and the washing and dewatering tank 21 and the pulsator in the dehydration operation and the drying operation. Mechanical switching is performed so that the main shaft 22 and the drive shaft 24 are connected to rotate the motor 23 together. When the connection between the main shaft 22 and the drive shaft 24 is released, the rotation of the main shaft 22 is restrained by a band brake (not shown). Therefore, the washing / dehydrating tub 21 does not rotate and only the pulsator 23 can rotate. That is, the state in which the main shaft 22 and the drive shaft 24 are connected by the clutch 261 is the tank rotation mode in the present invention, and the state in which the connection between the main shaft 22 and the drive shaft 24 is released is the blade rotation mode in the present invention.

  A drain opening 30 is formed at the bottom of the outer tub 20, and one end of a drain pipe 31 is connected to the drain opening 30. The drain pipe 31 is opened and closed by a drain valve 32. The other end of the drainage pipe 31 is connected to an external drainage groove through a standing drainage hose (not shown). The opening / closing operation of the drain valve 32 is linked to the operation of the torque motor 27 in the same manner as the connection switching operation of the clutch 261. That is, by driving the torque motor 27, the drainage valve 32 is opened when the washing and dewatering tub 21 and the pulsator 23 are connected to rotate integrally by the clutch 261, and the washing and dewatering tub 21 and the pulsator are opened by the clutch 261. When the connection with 23 is released so that only the pulsator 23 rotates, the drain valve 32 is closed.

  The upper surface opening of the outer tub 20 is covered with an outer tub cover 34 having an openable / closable inner lid 35. When the inner lid 35 is closed, the outer tub 20 is substantially sealed. The outer tub cover 34 has two pipes arranged side by side, that is, a water supply duct 36 for supplying water into the washing / dehydrating tub 21 and a high-temperature air introduced into the washing / dehydrating tub 21 during drying operation. The warm air duct 37 is connected. The inner lid 35 is formed with an exhaust port 38 for exhaust. Both the ducts 36 and 37 have a bellows shape, and even if the outer tub 20 swings, the pipes can be bent appropriately.

  A balance ring 40 is attached to the upper edge portion of the washing / dehydrating tub 21 to suppress a large vibration of the head during high-speed rotation. A circulation water channel 41 extending in the vertical direction from the bottom of the laundry dewatering tank 21 to the bottom of the balance ring 40 is formed on the inner peripheral surface of the laundry dewatering tank 21, and the circulation water channel 41 is directed vertically toward the inside of the laundry dewatering tank 21. A slender water discharge port 42 is provided on the water discharge port 42, and a lint filter 43 is detachably attached to the water discharge port 42. When the pulsator 23 is rotationally driven in a state where appropriate water is stored in the outer tub 20, water between the bottom surface of the outer tub 20 and the bottom surface of the washing / dehydrating tub 21 is pumped by the back blades on the lower surface of the pulsator 23. Is sucked into the washing / dehydrating tub 21 through a water passage hole 44 formed in the bottom surface of the washing / dehydrating tub 21, pushed out to the periphery, and fed into the lower end opening of the circulation water channel 41. Then, water is pushed up into the circulation water channel 41 and discharged from the water outlet 42 into the washing and dewatering tank 21. At this time, dust such as yarn waste mixed in the water is collected by the lint filter 43.

  On the other hand, a detergent charging duct 45 extends vertically from the bottom of the laundry dewatering tank 21 on the inner wall surface of the laundry dewatering tank 21 facing the circulation water channel 41 with the pulsator 23 interposed therebetween. The detergent inlet 46 at the upper end of the detergent inlet duct 45 can be freely opened and closed by a detergent inlet cover 47 that is opened by turning around the substantially horizontal axis so as to fall into the laundry dewatering tub 21. Prior to the washing operation, the user opens the detergent inlet cover 47, accommodates the detergent on the inner surface, and closes the cover 47. Then, the detergent falls in the detergent charging duct 45 and falls to the bottom of the laundry dewatering tank 21. After that, when water is poured into the washing and dewatering tank 21 and the pulsator 23 is rotationally driven, the detergent is passed along with the water fed into the detergent charging duct 45 by the pumping action of the back blades of the pulsator 23 as described above. It is supplied from the hole 48 into the washing and dewatering tank 21.

  As shown in FIG. 2, a substantially rectangular parallelepiped water injection port 50 elongated in the front-rear direction is provided in the center of the rear section 4 c of the upper surface plate 4. A hot air supply unit 52 as a hot air supply unit including a fan 521, a fan motor 522, and a heater 523 as a heating unit is disposed. On the other hand, a bath water pump 53 that is thin in the depth direction is disposed on the right side of the water inlet 50, and a water supply valve 54 is arranged behind the water supply valve 54. A water level sensor 55 for detecting the water level stored in the water is disposed. Although not shown, an air trap is formed at the bottom of the outer tub 20, and the other end of the air hose connected to the air trap is connected to the water level sensor 55.

  The water injection port 50 includes a tray 51 serving as a softening agent container so that the tray 51 can be pulled forward. The water supply valve 54 is a double valve, and in response to a control signal from the outside, a flow path for flowing water supplied to the water supply hose connection port 12 through the tray 51 in the water injection port 50, and the tray 51 It flows in either of the flow paths that flow without going through, or interrupts the flow. In general, when supplying water for washing or for rinsing other than the final rinse, water is supplied without passing through the tray 51, and water is supplied into the washing and dewatering tub 21 through the water supply duct 36. On the other hand, at the time of water supply for the final rinse, water flows through the tray 51, and water is supplied into the washing and dewatering tub 21 through the water supply duct 36 with the softening finish previously stored in the tray 51. The bath water pump 53 sucks in hot water remaining in the bath from the outside via the bath water absorption hose connection port 13 and discharges water to the water injection port 50.

  In the hot air supply unit 52, when the fan 521 is rotationally driven by the fan motor 522, the outside air is sucked through the intake port 15 provided with the intake filter provided on the rear surface of the rear decorative cover 11 so as to be detachable. It is sent into the outer tub 20 through a hot air duct 37 extending downward. The heater 523 is a PTC heater (semiconductor heater). When the heater 523 is energized during the air blowing by the fan 521 as described above, the outside air heated by the heater 523, that is, warm air is supplied into the outer tub 20. The If the heater 523 is not energized, unheated outside air, that is, cold air is supplied into the outer tub 20.

  A temperature sensor (thermistor) 56 for detecting the temperature of the outer tub cylinder is closely attached to the outer side of the outer tub cylinder forming the peripheral surface of the outer tub 20. The temperature of the outer tub body substantially reflects the temperature of the air in the washing / dehydrating tub 21, and the temperature sensor 56 corresponds to the temperature detecting means in the present invention.

  In addition, in the washing / drying machine of the present embodiment, although not shown in the drawing, an electrolytic device for electrolyzing the stored water (for example, water added with saline) in the outer tub 20 is provided at the bottom of the outer tub 20. The electrolyzed water is electrolyzed to produce chlorine-containing substances such as hypochlorite ions that have bleaching action, and this can be used for washing without detergent (detergent zero course). Yes.

  FIG. 4 is an electrical system configuration diagram of the main part of the washing and drying machine of the present embodiment. At the center of control, a control unit 70 including a CPU, a RAM, a ROM, a timer and the like is installed as an operation control means in the present invention. The control unit 70 receives a key signal from an operation unit 72 having a plurality of operation keys such as a course selection key and a start key, and a water level detection signal corresponding to the water level stored in the outer tub 20 from the water level sensor 55. The lid opening / closing signal interlocked with the opening / closing of the upper lid 7 is input from the upper lid switch 74, and the temperature detection signal is input from the temperature sensor 56. The control unit 70 rotates the main motor 25, opens / closes the water supply valve 54, operates the torque motor 27, operates the bath water pump 53, and heats the heater 523 in the hot air supply unit 52 via the load driving unit 71. The operation of the fan motor 522 and the operation of the upper lid lock mechanism 16 are controlled. As described above, the connecting / disengaging operation of the main shaft 22 and the driving shaft 24 by the clutch 261 and the opening / closing operation of the drain valve 32 are achieved by the torque motor 27. Furthermore, the control unit 70 causes the display unit 73 to display the key input acceptance state of the operation unit 72 and the progress of washing.

  Operation programs corresponding to various courses are stored in advance in the ROM of the control unit 70, and the control unit 70 controls each unit according to the operation program corresponding to the course selected by the user using the course selection key of the operation unit 72. By doing so, washing operation and drying operation corresponding to each course are performed.

  In the washing and drying machine of the present embodiment, for example, from the start of the washing process of washing, rinsing, and dehydration to the end of the drying process can be automatically performed, or only the drying process can be selectively performed. However, in any case, it has the feature especially in the control of the drying operation for drying the laundry. Hereinafter, the control at the time of the drying operation performed mainly by the control unit 70 will be described in detail with reference to FIGS.

  FIG. 5 is a schematic flowchart at the time of drying operation in the washing and drying machine of the present embodiment, and FIG. 6 is a schematic timing chart of each part at the time of drying operation. As shown in FIG. 6, the drying operation is roughly divided into a main drying process, an additional drying process, and a cool-down process, and the main drying process is further performed in a dehydration drying operation period, a tank rotation center operation period, and a blade rotation center operation. Can be divided into periods.

  When the drying operation is started in a state where the wet laundry is accommodated in the washing / dehydrating tub 21, the control unit 70 drives the fan motor 522 via the load driving unit 71, and the rotational speed of the fan 521 is 4200 rpm. It sets to weak ventilation and waits for a predetermined time (for example, about 9 seconds) in that state. For example, it is possible to check whether or not the fan 521 is rotating during this period. Thereafter, execution of the dehydration drying operation is started (step S1).

  When the dehydration drying operation is started, first, the control unit 70 drives the main motor 25 in a state where the main shaft 22 and the drive shaft 24 are connected (tank rotation mode), and the washing dewatering tank 21 and the pulsator 23 are integrated at high speed. Start up to rotate. The target rotational speed at this time is set to 900 rpm, for example. This is the same as the rotation speed during dehydration during the previous washing process.

  Therefore, the laundry is firmly attached to the inner peripheral wall surface of the laundry dewatering tub 21 and rotated in the same manner as during dehydration, and a spiral air flow is generated in the laundry dewatering tub 21 as the rotation occurs. Although not heated at this time, outside air (cold air) is continuously supplied from the hot air duct 37 into the washing and dewatering tank 21 by the fan 521. Therefore, the wet laundry sticking to the inner peripheral surface of the laundry dewatering tank 21 is exposed to a strong air flow, and moisture is discharged from the laundry. Air containing moisture from the laundry passes through the exhaust port 38 and is discharged from the outside of the outer tub 20 to the outside of the machine. Instead, relatively dry outside air is taken into the laundry dewatering tub 21. In addition, since the water remaining in the laundry without being squeezed out before the dehydration is squeezed out by centrifugal force and scattered to the outer tub 20 side through the water passage hole of the laundry dewatering tub 21, Drying by dehydration also proceeds together with the drying effect by blowing.

  When the predetermined time t1 has elapsed from the start of the dehydration drying operation (YES in step S2), the control unit 70 starts energizing the heater 523 while continuing the high speed rotation of the washing dewatering tub 21 (step S3). At this time, the rotational speed of the fan motor 522 is increased to 4500 rpm, and the air blowing by the fan 521 is changed to strong air blowing. Thereby, the warm air heated by the heater 523 is sent into the washing / dehydrating tub 21 with a larger air flow than before. Here, the predetermined time t1 is determined according to the load amount of the laundry, for example, and the time t1 is lengthened as the load amount increases.

  In this example, when the load is large and the total length of the dehydration drying operation (a predetermined time t2 described later) is 60 minutes, the predetermined time t1 is 40 minutes. Most of the water that can be scattered by dehydration from the start of the dehydration drying operation until the elapse of the predetermined time t1 has come out of the laundry, and the inner surface of the laundry stuck to the inner peripheral surface of the laundry dewatering tank 21 Is also quite dry. When warm air begins to be supplied into the laundry dewatering tank 21 in step S3, drying of the laundry attached to the inner peripheral surface of the laundry dewatering tank 21 is further promoted by the heat, and the laundry and the laundry dewatering tank are also washed. 21 itself will be warmed. Thus, if the predetermined time t2 has elapsed from the start of the dehydration drying operation (YES in step S4), the control unit 70 temporarily turns off the heater 523 and drops the fan motor 522 to weak air blowing to stop the main motor 25. The laundry dewatering tank 21 is stopped. This completes the dehydration drying operation [i].

  The reason why the fan 521 is weakly blown when the heater 523 is turned off is to reduce the noise caused by the high-speed rotation of the fan 521 as much as possible in addition to the effect of increasing the blown air volume when it is not warm air. It is.

  When the dehydration drying operation [i] period ends, the tank rotation center operation [ii] is performed (step S5). That is, first, the control unit 70 operates the torque motor 27 to release the connection between the main shaft 22 and the drive shaft 24 by the clutch 261 and restrains the rotation of the washing and dewatering tank 21 by the band brake. Thereby, it becomes a blade rotation mode in which only the pulsator 23 can rotate. Then, by driving the main motor 25 with the drive pattern A, the pulsator 23 is rotated in the left-right direction. Specifically, in this example, the blade rotation of the drive pattern A is performed by setting the target rotational speed of the pulsator 23 at the time of ON to 700 rpm and turning on the right 0.8 seconds-1.5 seconds off-left 0.8. The intermittent energization of seconds on-1.5 seconds off is one cycle, and this is repeated for 3 minutes. However, since the ON time of the main motor 25 is short, the rotational speed of the pulsator 23 does not actually increase to 700 rpm.

  In addition, the controller 70 reduces the rotational speed of the fan motor 522 to 4200 rpm for a short time, then increases the speed again to 4500 rpm to perform strong air blowing, and for a short time in synchronization with the change in the rotational speed of the fan 521, the heater 523. After turning off, heating is performed again by turning it on. When the pulsator 23 is reversed left and right by the above driving, the laundry being dried in the laundry dewatering tub 21 is agitated, and the laundry that has been thinly compressed by centrifugal force at the time of high-speed rotation of the previous laundry dewatering tub 21 spreads. Warm air can easily enter between the overlapping fabrics. As a result, the entire laundry is evenly warmed.

  When the blade rotation of 3 minutes in the drive pattern A has elapsed, the control unit 70 operates the torque motor 27 to connect the main shaft 22 and the drive shaft 24 by the clutch 261 and releases the band brake. Thereby, it becomes the tank rotation mode in which the washing | cleaning dehydration tank 21 and the pulsator 23 can rotate integrally. Then, the control unit 70 drives the main motor 25 to increase the rotational speed of the washing dewatering tub 21 to 350 rpm, which is lower than the rotational speed at the time of the previous dehydration drying, and keeps the state in that state for a predetermined time, for example, 10 minutes. The energization to the motor 25 is stopped. Even after the energization is stopped, the washing and dewatering tub 21 continues to rotate due to inertia and takes about 2 minutes to stop. Therefore, the period of tank rotation is about 12 minutes. Of these 12 minutes, the heater 523 is initially turned on following the blade rotation, and warm air is supplied into the washing / dehydrating tub 21, but the heater 523 is turned on when, for example, 9 minutes have elapsed since the start of the tub rotation. Turn off.

  That is, in the tank rotation center operation [ii] in step S5, for example, about 15 minutes including the blade rotation for 3 minutes and the tank rotation for 12 minutes is set as one cycle, and this is repeated a plurality of times. During this one cycle, the heater 523 is turned on for about 12 minutes, and is turned off for the remaining period of about 3 minutes, that is, the period of about 3 minutes in the latter half of the tank rotation. The drying of the inner surface of the laundry stuck to the inner peripheral surface of the washing / dehydrating tub 21 by the rotation of the tub until the heater 523 is turned off has advanced considerably, so even if the heater 523 is turned off and the temperature of the blast is lowered There is not much influence on drying efficiency. Furthermore, since the rotation speed of the washing / dehydrating tub 21 is lowered for 2 minutes out of 3 minutes, the drying efficiency is not further affected. As described above, the power consumption per unit time of the heater 523 is considerably larger than the power consumption of the motors 25 and 522, but the heater 523 is frequently energized in such a period that does not greatly affect the drying efficiency. By stopping, power consumption can be reduced without reducing the drying efficiency. Here, instead of completely stopping energization to the heater 523, the output may be lowered.

  As an actual control by the control unit 70, after starting the tank rotation center operation [ii], the control unit 70 uses the temperature sensor 56 to set the temperature T1 of the outer tub cylinder reflecting the temperature of the air in the washing and dewatering tub 21. It is detected (step S6), and it is determined whether or not the detected temperature T1 has increased by ΔT1 or more than the detected temperature at the start of the tank rotation center operation (step S7). Here, ΔT1 is set to 5 ° C., for example. That is, if the detected temperature T1 is higher than the detected temperature at the start of the tank rotation center operation by 5 ° C. or more, the process proceeds from step S7 to S9. Otherwise, the process proceeds to step S8. It is determined whether the temperature is equal to or higher than a specified temperature lower than the set upper limit temperature TH by ΔT2. In this example, the upper limit temperature TH is changed according to the load amount, but is set to 52 ° C., for example, with respect to the maximum load amount. ΔT2 may be set to a value of about 2 to 5 ° C.

  For example, if the detected temperature at the start of the tank rotation center operation is 40 ° C. and ΔT2 is 5 ° C., the determination reference temperature in step S7 is 45 ° C., and the determination reference temperature in step S8 is 47 ° C. When the detected temperature T1 reaches 45 ° C., the process proceeds from step S7 to S9. On the other hand, for example, if the detected temperature at the start of the tank rotation center operation is 43 ° C. and ΔT2 is 5 ° C., the determination reference temperature in step S7 is 48 ° C., and the determination reference temperature in step S8 is 47 ° C. Therefore, when the detected temperature T1 reaches 47 ° C., the process proceeds from step S8 to S9.

  And since it returns from step S8 to S5 until it determines with YES by either step S7 or S8, until then, the tank rotation which made the blade rotation for 3 minutes and the tank rotation for 12 minutes as mentioned above one cycle The drying by the center operation is repeated. As described above, the number of repetitions varies depending on the degree of drying due to the amount of load and the quality of the laundry, but generally one cycle is repeated about 6 to 8 times. At this time, as described above, since the time for rotating the tub is longer than that for rotating the wings, the laundry can be efficiently dried. In addition, the laundry is agitated when the blades are rotated, and the upper and lower sides are interchanged, and the inside and the outside of the mass are interchanged. Since things are replaced, high drying performance as a whole can be achieved while suppressing drying unevenness.

  Next, when proceeding to step S9, the tank rotation center operation [ii] shifts to the blade rotation center operation [iii]. In the blade rotation center operation [iii], first, the control unit 70 is set to the blade rotation mode, and the pulsator 23 is rotated in the reverse direction by driving the main motor 25 with the drive pattern B different from the drive pattern A. Specifically, in this example, the blade rotation of the drive pattern B is set such that the target rotational speed of the pulsator 23 at the time of ON is set to 100 rpm and the right direction is 0.8 seconds on-1.5 seconds off-left direction 0. An intermittent energization of 8 seconds on-1.5 seconds off is one cycle, and this is repeated for 30 minutes.

  Further, the controller 70 reduces the rotational speed of the fan motor 522 to 4200 rpm for a short period of time as in the case of the tank rotation center operation, then increases the speed again to 4500 rpm to perform strong air blowing, and changes in the rotational speed of the fan 521. The heater 523 is also turned off for a short time in synchronism with the above, and then turned on again for heating.

  When the blade rotation of 30 minutes in drive pattern B has elapsed, the control unit 70 switches to the tank rotation mode, drives the main motor 25 and energizes for 5 seconds with a target rotation speed of 350 rpm. As a result, the rotational speed of the washing / dehydrating tub 21 is rapidly increased, and the laundry sticks to the inner peripheral surface of the washing / dehydrating tub 21. It falls again to the inner bottom of the washing and dewatering tank 21. Actually, the duration of the tank rotation is about 1 minute. As described above, in the blade rotation center operation [iii] in step S9, about 31 minutes including the blade rotation of about 30 minutes and the tank rotation of about 1 minute is set as one cycle, and this is repeated a plurality of times. In addition, after shifting to the blade rotation center operation [iii], the heater 523 continues to be turned on, and the rotational speed of the fan motor 522 is maintained at 4500 rpm, that is, a strong air blowing state.

  In this blade rotation center operation, the blade rotation time is much longer than the tank rotation time. Here, the main purpose of the tank rotation is not to dry the laundry, but the main purpose is to promote the peeling of the laundry that is becoming tangled during the rotation of the wings and to reduce the entanglement And the laundry dewatering tank 21 is rotated at a high speed to generate a strong spiral air flow in the laundry dewatering tank 21 so that the moist air staying inside is actively discharged from the outer tank 20. There is to make it. On the other hand, the rotation of the wings rather than replacing the position of the laundry, moderately stirring the laundry, creating a moderate space between the fabric, while applying warm air, stretch the wrinkles of the laundry, It is intended to give a soft feeling or to dry a part that has been partially moistened with uneven drying.

  As actual control by the control unit 70, when the blade rotation center operation [iii] is started, the control unit 70 detects the temperature T2 of the outer tub cylinder by the temperature sensor 56 (step S10), and the detected temperature T2 It is determined whether or not the temperature has reached the above-described upper limit temperature TH (step S11). If the detected temperature T2 is equal to or higher than the upper limit temperature TH, for example, 52 ° C., the process proceeds to step S13. Otherwise, the process proceeds to step S12, and the detected temperature 15 minutes after the start of the tank rotation center operation is used as the reference temperature. Tp is determined, and it is determined whether or not the detected temperature T2 is higher than the reference temperature Tp by ΔT3. In this example, ΔT3 is set to a value of about several to 10 ° C.

  In general, since the air flow in the outer tub 20 is fast when the tub rotates, the detected temperature of the outer tub body tends to decrease, and the temperature of the laundry that rises as the drying progresses is accurately captured by the temperature sensor 56. Is difficult. On the other hand, in the blade rotation center operation [iii], the blade rotation time is much longer than the tank rotation time, so the temperature of the laundry that rises with the progress of drying is reduced during the blade rotation period. It can be obtained with high accuracy by the temperature sensor 56. Thereby, the degree of drying of the laundry can be accurately grasped.

  And since it returns to step S9 from step S12 until it determines with YES in either step S11 or S12, the drying which makes the blade rotation of about 30 minutes and the tank rotation of about 1 minute as mentioned above until 1 period become 1 cycle. Is repeated. As described above, the number of repetitions varies depending on the amount of drying, the quality of the laundry, and the like, but generally one cycle is repeated about 2 to 3 times.

  At the time of proceeding to step S13, the blade rotation center operation [iii] is completed and the additional drying process is continued. First, the additional drying time is determined in accordance with the time required for drying so far and the load amount (step). S13). In general, when the time required for drying is long, it can be estimated that clothes (for example, jeans) that are difficult to dry even if the load amount is the same are stored in the washing / dehydrating tub 21. Increase the additional drying time. The additional drying process itself in step S14 is the same as the blade rotation center operation, and it can be considered that the time of the blade rotation center operation is extended. If the previously determined additional drying time has elapsed (YES in step S15), the additional drying process is terminated and the process proceeds to the cool-down process (step S16).

  With the transition to the cool-down process, the control unit 70 turns off the heater 523 and sends room temperature air (cold air) into the washing and dewatering tub 21. At this time, since it is necessary to lower the temperature of the laundry as quickly as possible, the rotational speed of the fan 521 is set to 4500 rpm to ensure a large air volume. The control unit 70 operates the torque motor 27 to release the connection between the main shaft 22 and the drive shaft 24 by the clutch 261, and restrains the rotation of the washing and dewatering tank 21 by the band brake. Thereby, it becomes a blade rotation mode in which only the pulsator 23 can rotate. Then, the pulsator 23 is rotated in the left-right direction by driving the main motor 25 with a drive pattern C that is different from the drive patterns A and B. Specifically, in this example, the blade rotation in the drive pattern C is set such that the target rotational speed of the pulsator 23 at the time of ON is set to 150 rpm, and the right direction is 3 seconds on-1.5 seconds off-left direction 3 seconds on-1 . 5 seconds off intermittent energization is one cycle, and this is repeated for 5 minutes. In this case, since the ON time is longer than the blade rotation of the drive patterns A and B, the maximum rotation speed reached by the pulsator 23 is the highest.

  When the 5-minute blade rotation in drive pattern C has elapsed, control unit 70 operates torque motor 27 to connect main shaft 22 and drive shaft 24 by clutch 261 to release the band brake. Thereby, it becomes the tank rotation mode in which the washing | cleaning dehydration tank 21 and the pulsator 23 can rotate integrally. Then, the main motor 25 is driven, the target rotation speed is set to 350 rpm, and high speed rotation is performed for 5 minutes. Thus, the blade rotation for 5 minutes and the tank rotation for 5 minutes are combined to make one cycle, and this is repeated a plurality of times. At this time, the wing rotation is mainly aimed at accelerating the cooling by uniformly applying the cold air to the laundry by stirring the laundry, and the tank rotation is mainly intended to dissipate the dung-like laundry at the time of the wing rotation. It is said.

  As the actual control by the control unit 70, when the cool-down process is started, the control unit 70 detects the temperature T3 of the outer tub body by the temperature sensor 56 (step S17), and the detected temperature T3 is a predetermined temperature, for example, It is determined whether or not the temperature has decreased to 50 ° C. If the temperature has decreased to 50 ° C or less, the cool-down process is terminated. That is, all the drying steps are completed. On the other hand, if the detected temperature T3 has not decreased to the predetermined temperature, it is next determined whether or not a predetermined time, for example, 20 minutes has elapsed since the start of the cool-down process (step S19), and 20 minutes have elapsed. If so, the cool-down process ends. Until the detected temperature T3 is not lowered to 50 ° C. and 20 minutes have passed, the process returns from step S19 to S16, and the cool-down process is continued.

  In the washing / drying machine of the present embodiment, both efficient drying and good drying finish can be achieved by the above procedure.

  In addition to the standard drying process, the present washing / drying machine has an iron course that is suitable for ironing and can be selected by the operation of the operation unit 72. . When the drying operation by the iron course is set, instead of the upper limit temperature TH, a temperature lower than the upper limit temperature TH by a predetermined temperature, for example, 2 ° C. is set. Accordingly, the drying is completed with the moisture remaining in the laundry as compared with the normal drying operation, and it is suitable for subsequent ironing.

  Further, in the washing / drying machine of the present embodiment, if the intake filter provided in the intake port 15 is clogged or if the PTC heater 523 itself is clogged due to operation without the intake filter attached, the fan 521 Even if the rotation speed is the same, the air volume decreases. Then, the difference between the temperature detected by the outer tub body temperature sensor 56 and the temperature of the air in the washing / dehydrating tub 21 widens, and there is a risk of overdrying in the control described above. Therefore, the control unit 70 monitors the power consumption of the entire washing / drying machine including the power consumption of the heater 523, and when the power consumption is lower than a specified value, the power consumption of the heater 523 is reduced due to the decrease in the air flow rate. As in the case of the ironing course, instead of the upper limit temperature TH, control is executed by setting a temperature lower than the upper limit temperature TH by a predetermined temperature, for example, 2 ° C. Thereby, even when the intake filter is clogged, overdrying and wrinkling of the laundry can be prevented.

  It should be noted that the above embodiment is merely an example, and it is obvious that even if changes, modifications, and additions are made as appropriate within the scope of the present invention, they are included in the scope of the claims of the present application. In particular, the various numerical values described in the above embodiments are merely examples, and can be changed as appropriate.

1 is an external perspective view of a washing / drying machine according to an embodiment of the present invention. The upper surface top view which shows the state which removed the rear decorative cover and upper cover of the washing-drying machine of a present Example. The schematic side surface sectional view which shows the internal structure of the washing-drying machine of a present Example. The electric system block diagram of the washing dryer of a present Example. The schematic flowchart at the time of the drying operation in the washing dryer of a present Example. The timing chart of the principal part at the time of drying operation in the washing / drying machine of a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Outer box 2 ... Base part 3 ... Front side plate 4 ... Top plate 5 ... Rear plate 6 ... Laundry input 7 ... Upper lid 10 ... Front decorative cover 11 ... Rear decorative cover 15 ... Inlet 20 ... Outer tub 21 ... Washing and dewatering tank 22 ... main shaft 23 ... pulsator 24 ... drive shaft 25 ... main motor 26 ... power transmission mechanism 261 ... clutch 27 ... torque motor 34 ... outer tank cover 35 ... inner lid 37 ... hot air duct 38 ... exhaust port 52 ... temperature Wind supply unit 521 ... fan 522 ... fan motor 523 ... heater 56 ... outer shell temperature sensor

Claims (11)

A washing / dehydrating tub also serving as a drying tub provided rotatably in the outer tub, a rotary blade provided rotatably at the inner bottom of the washing / dehydrating tub, and the laundry dewatering tub and the rotary wing for driving the rotation Drive switching means for switching between a drive source of the blade, a blade rotation mode in which only the rotor blade is rotated by the driving force of the drive source, and a tank rotation mode in which the rotor blade and the washing and dewatering tank are rotated together by the driving force And a hot and cold air supply means comprising a blowing means and a heating means for sending warm air into the washing and dewatering tank,
When drying the laundry in the washing and dewatering tub mainly using the warm air from the warm air supply means, a first period of rotational driving in the blade rotation mode and rotational driving in the tank rotation mode are performed. An operation control means for controlling the drive source and the drive switching means to repeat this with a second period to be performed as one cycle, and centering on the tank rotation in which the second period in one cycle is longer than the first period After performing the drying in the tank rotation center operation, the operation control means for performing the drying in the blade rotation center operation centered on the blade rotation in which the first period in one cycle is longer than the second period is provided. A washing dryer characterized by.   When the laundry is dried, before the drying in the tank rotation center operation is performed, the operation control means is configured in the tank rotation mode so that the washing and dehydration tank and the rotor blades in the second period at the time of the tank rotation center operation. The washing / drying machine according to claim 1, wherein a dehydrating and drying operation is performed in which the rotational drive is performed at a rotational speed higher than the rotational speed.   When the dehydrating and drying operation is performed, the operation control unit sends cold air to the washing and dewatering tub by the blowing unit without operating the heating unit in the initial stage, and operates the heating unit on the way to warm air. The washing / drying machine according to claim 2, wherein the washing / drying tank is fed into the washing / dehydrating tank.   The operation control means performs the drying in the blade rotation center operation, and then sends the cold air to the washing and dewatering tub by the air blowing means without operating the heating means, and relatively in the blade rotation mode. 4. The washing / drying machine according to claim 1, wherein cool-down is performed in which low-speed rotation driving and relatively high-speed rotation driving in the tank rotation mode are alternately repeated.   The said operation control means provides the period which stops or weakens the heating by the said heating means temporarily at least during execution of the said tank rotation center driving | operation, Washing and drying in any one of Claims 1-4 characterized by the above-mentioned. Machine.   The washing / drying machine according to claim 5, wherein a period in which heating by the heating unit is temporarily stopped or weakened is provided in the second half of the second period within one cycle in the tank rotation center operation.   Temperature detection means for detecting a temperature reflecting the temperature of the air in the washing and dewatering tub, and the operation control means monitors the temperature detected by the temperature detection means during execution of the tub rotation center operation, and at least the tub The washing / drying machine according to any one of claims 1 to 6, wherein the operation is shifted to the blade rotation center operation when the temperature rises by a predetermined value or more from the start of the rotation center operation.   Temperature detection means for detecting a temperature reflecting the temperature of the air in the laundry dewatering tub, and the operation control means monitors the temperature detected by the temperature detection means during execution of the tank rotation center operation, and at least the laundry The washing / drying machine according to any one of claims 1 to 7, wherein the operation is shifted to the blade rotation center operation when the temperature rises to a predetermined temperature according to a load amount of the blade.   The operation control means monitors the temperature detected by the temperature detection means at the time of execution of the blade rotation center operation, and the temperature is at least a predetermined value higher than the detection temperature after a predetermined time has elapsed since the start of the tank rotation center operation immediately before. The laundry dryer according to any one of claims 7 and 8, wherein the laundry is determined to have been dried at the time of rising.   10. The laundry drying according to claim 9, wherein the operation control unit stops the heating unit after continuing the blade rotation center operation for an appropriate time from the time when it is determined that the drying of the laundry is finished. Machine. A washing / dehydrating tub also serving as a drying tub provided rotatably in the outer tub, a rotary blade provided rotatably at the inner bottom of the washing / dehydrating tub, and for rotating the washing / dehydrating tub and the rotary wing. Drive switching means for switching between a driving source of the blade, a blade rotation mode in which only the rotor blade is rotated by the driving force of the driving source, and a tank rotation mode in which the rotor blade and the washing and dewatering tank are rotated integrally by the driving force And a hot and cold air supply means comprising a blowing means and a heating means for sending warm air into the washing and dewatering tank,
After performing a drying operation for drying the laundry in the laundry dewatering tub mainly using the warm air supplied from the hot air supply means, air is supplied to the laundry dewatering tub by the blowing means without operating the heating means. An operation control means for performing a cool-down for controlling the drive source and the drive switching means to alternately and repeatedly perform the rotation drive in the blade rotation mode and the rotation drive in the tank rotation mode while feeding. Features a washing dryer.

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