JP2021029931A - Washing and drying machine - Google Patents

Abstract

To provide a washing and drying machine capable of improving the effect of pre-heat dewatering.SOLUTION: A pre-heat dewatering step includes: a first period which is a period before the rotational frequency of a rotary tub reaches a target speed, in which a blower device is driven at initial rotational frequency, and a drain valve is kept at an open state; a second period which is a period after the first period and before the rotational frequency of the rotary tub reaches the target speed, in which the rotational frequency of the blower device is kept at a state of being lower than the initial rotational frequency, and in which the drain valve is kept at the open state; a third period which is a period after the second period, in which the rotational frequency of the rotary tub is kept at the target speed, in which the rotational frequency of the blower device is kept at a state of being lower than the initial rotational frequency, and in which the drain valve is kept at the open state; and a fourth period which is a period after the third period, in which the rotational frequency of the rotary tub is kept at the target speed, in which the rotational frequency of the blower device is kept at a state of being increased to be higher than the initial rotational frequency, and in which the drain valve is kept at a closed state.SELECTED DRAWING: Figure 12

Description

Embodiments of the present invention relate to a washer / dryer.

Conventionally, in order to realize a drying function, a washer / dryer has a circulation air passage for circulating air in the water tank and a circulation air passage for heating the air flowing through the circulation air passage to supply warm air into the water tank. Some are equipped with a hot air supply device. In such a washer / dryer, so-called preheat dehydration is known as one aspect of the dehydration step. Preheat dehydration is an operation mode in which warm air is blown into the water tank from the final dehydration step before the drying operation to raise the temperature of the laundry in advance, thereby shortening the time of the drying operation executed after the dehydration step. be able to.

However, in the conventional washer / dryer, the effect of preheat dehydration has not been sufficiently obtained, and there is room for improvement.

Japanese Unexamined Patent Publication No. 2016-52450

Therefore, a washer / dryer capable of improving the effect of preheat dehydration is provided.

The washer-dryer of the embodiment includes a water tank capable of storing water inside, a rotary tank rotatably provided in the water tank and capable of accommodating laundry inside, a motor for rotationally driving the rotary tank, and the like. A circulation air passage provided outside the water tank to connect the exhaust port and the air supply port of the water tank, and a blower device provided in the middle of the circulation air passage to blow air into the water tank and the rotary tank. A warm air supply device that heats the air in the circulation air passage, a filter device that is provided in the middle of the circulation air passage and collects lint contained in the air flowing through the circulation air passage, and water in the water tank. A drainage path for draining water to the outside, a drainage valve for opening and closing the drainage path, and a control device for controlling the drive of the motor, the blower, the warm air supply device, and the drainage valve are provided. The control device can execute a preheat dehydration process in which the hot air supply device is driven to supply warm air into the rotary tank while the rotation speed of the rotary tank is increased to a target speed for centrifugal dehydration. The preheat dehydration step is a period before the rotation speed of the rotary tank reaches the target speed, and is a first period in which the blower is driven at the initial rotation speed and the drain valve is maintained in an open state. In the period after the first period and before the rotation speed of the rotary tank reaches the target speed, the rotation speed of the blower device is lowered from the initial rotation speed. During the second period during which the drain valve is maintained and the drain valve is maintained in the open state and the period after the second period, the rotation speed of the rotary tank is maintained at the target speed, and the blower of the blower device. A third period in which the rotation speed is maintained lower than the initial rotation speed and the drain valve is maintained in an open state, and a period after the third period, in which the rotation speed of the rotary tank is maintained. Includes a fourth period in which the target speed is maintained and the rotation speed of the blower is maintained at a state higher than the initial rotation speed and the drain valve is maintained in a closed state. ..

Longitudinal side view showing a schematic configuration of a washer / dryer according to the first embodiment Longitudinal rear view showing the schematic configuration of the washer / dryer according to the first embodiment. The figure which shows typically the schematic structure of the heat pump unit about the washer-dryer according to 1st Embodiment. A block diagram showing the configuration of a control system for the washer / dryer according to the first embodiment. A flowchart showing the control contents of the washing / drying operation by the control device for the washing / drying machine according to the first embodiment. A flowchart showing the control contents of the preliminary dehydration process for the washer / dryer according to the first embodiment. A flowchart showing the control contents of the preheat dehydration process by the control device for the washer / dryer according to the first embodiment. The figure which shows the control condition of the pre-dehydration process and the preheat dehydration process by the weight of the laundry and the cloth quality of the laundry about the washer-dryer according to 1st Embodiment. The figure which shows the control content of the preliminary dehydration process by each control condition about the washer-dryer according to 1st Embodiment. For the washer / dryer according to the first embodiment, a time chart showing the control contents of the preliminary dehydration process under each control condition. The figure which shows the control content of the preheat dehydration process by each control condition about the washer-dryer according to 1st Embodiment. For the washer / dryer according to the first embodiment, a time chart showing the rotation speed of the drum in the preheat dehydration process, the rotation speed of the blower, the opening / closing of the drain valve, and the on / off of the heat pump unit. The figure which shows the control content of the preheat dehydration process by each control condition about the washer-dryer according to 2nd Embodiment. The figure which shows the control content of the preheat dehydration process by each control condition about the washer-dryer according to 3rd Embodiment. The figure which shows the control content of the preheat dehydration process by each control condition about the washer-dryer according to 4th Embodiment.

Hereinafter, a washer / dryer according to a plurality of embodiments will be described with reference to the drawings. In each embodiment, substantially the same constituent parts are designated by the same reference numerals, and the description thereof will be omitted.

(First Embodiment)
First, the first embodiment will be described with reference to FIGS. 1 to 12. As shown in FIG. 1, the washer / dryer 10 includes an outer box 11, a water tank 12, a rotary tank 13, a rotary tank motor 14, and a door 15. The washer / dryer 10 is a so-called drum type washer / dryer having a heat pump type drying function, for example, in which the rotation axis of the rotary tub 13 is horizontal or inclined with respect to the ground. The washer / dryer 10 is not limited to the drum type, and may be a so-called vertical type washer / dryer in which the rotation axis of the rotary tub 13 is oriented in the direction perpendicular to the ground.

The outer box 11 is formed in the rectangular box shape by a steel plate or the like. The water tank 12 is housed inside the outer box 11. The rotary tank 13 is housed inside the water tank 12. Both the water tank 12 and the rotary tank 13 are formed in a cylindrical shape. The water tank 12 is provided with an opening 121 formed at one end of a cylinder and a water tank end plate 122 at the other end. The opening 121 is located above the water tank end plate 122 in the inclined water tank 12.

Similarly, in the rotary tank 13, an opening 131 is formed at one end of the cylinder, and a rotary tank end plate 132 is provided at the other end. The opening 131 is located above the rotary tank end plate 132 in the tilted rotary tank 13. The opening 131 of the rotary tank 13 is surrounded by the opening 121 of the water tank 12. The water tank 12 and the rotary tank 13 function as a washing room and a drying room for accommodating laundry.

The water tank 12 has an exhaust port 16 and an air supply port 17. The exhaust port 16 is provided on the peripheral wall forming the tubular portion of the water tank 12, for example, in the upper front portion. The air supply port 17 is provided in the water tank end plate 122 at a portion slightly above the center of the water tank end plate 122. The exhaust port 16 and the air supply port 17 communicate the inside and the outside of the water tank 12.

The water tank 12 has a drainage portion 18 on the rear end side of the bottom portion located below in the direction of gravity. The drainage portion 18 is located below the exhaust port 16 and the air supply port 17. The drainage unit 18 includes a drainage port 123, a drainage valve 19, and a drainage hose 20. The drain port 123 is provided at the bottom of the water tank 12 and communicates the inside and the outside of the water tank 12. The drain valve 19 is composed of, for example, an electromagnetic on-off valve for liquid, and is provided between the drain port 123 and the drain hose 20. The drain hose 20 connects the drain port 123 and the outside of the machine, and functions as a drain path for draining the water in the water tank 12 to the outside. In this case, the drain valve 19 opens and closes the drainage path between the drainage port 123 and the drainage hose 20. That is, when the drain valve 19 is opened, the water in the water tank 12 is discharged from the drain port 123 to the outside of the washer / dryer 10 via the drain valve 19 and the drain hose 20.

The rotary tank 13 has a plurality of holes 21 and a plurality of communication ports 22. The hole 21 and the communication port 22 communicate the inside and the outside of the rotary tank 13. The holes 21 are formed in the entire peripheral wall forming the cylindrical tubular portion of the rotary tank 13. The communication port 22 is formed in the entire area of the rotary tank end plate 132. The hole 21 and the communication port 22 function mainly as a water passage hole through which water enters and exits during a washing operation including a washing step, a drainage step, a rinsing step, and a dehydration step, and functions as a ventilation hole through which air enters and exits during a drying operation. .. The holes 21 and the communication port 22 function as water passage holes and ventilation holes in the preheat dehydration step. Note that FIG. 1 shows only a part of the plurality of holes 21 and the communication port 22 for the sake of simplicity. Further, although details are not shown, the rotary tank 13 is provided with a plurality of baffles inside the tubular portion. The baffle stirs laundry such as clothes housed inside the rotary tub 13.

The rotary tank motor 14 is located on the outside of the water tank 12 and is provided on the water tank end plate 122. The rotary tank motor 14 is, for example, an outer rotor type DC brushless motor. The shaft portion 141 of the rotary tank motor 14 penetrates the water tank end plate 122, projects inward of the water tank 12, and is fixed to the central portion of the rotary tank end plate 132. As a result, the rotary tank motor 14 rotates the rotary tank 13 relative to the water tank 12. In this case, the shaft portion 141, the rotary shaft of the rotary tank 13, and the central shaft of the water tank 12 are coincident with each other.

The door 15 is provided on the outer surface side of the outer box 11 via a hinge (not shown). The door 15 rotates around a hinge as a fulcrum to open and close an opening (not shown) formed on the front surface of the outer box 11. The opening formed in the outer box 11 is connected to the opening 121 of the water tank 12 by the bellows 112. Laundry such as clothes is taken in and out of the rotary tub 13 through the openings 121 and 131 with the door 15 open.

The washer / dryer 10 includes a control device 23 and an operation panel 24 shown in FIG. 4, and a water supply device 25 shown in FIG. The control device 23 is mainly composed of a microcomputer having a storage area 232 such as a CPU 231, a ROM, a RAM, and a rewritable flash memory, and controls the overall operation of the washer / dryer 10.

As shown in FIG. 1, for example, the operation panel 24 is provided on the front surface of the outer box 11 and above the door 15. As shown in FIG. 4, the operation panel 24 is connected to the control device 23, and the user makes various settings such as selection of a driving course by operating the operation panel 24. Further, the operation panel 24 has a notification unit 241. The notification unit 241 is for notifying the user of various types of information. The notification unit 241 needs to notify the user of various information, for example, when the operation setting is changed, when the operation is completed, or when an abnormality occurs in the washer / dryer 10. In such a case, it has a function of notifying the user that the above has occurred due to, for example, an image or sound. The notification unit 241 is, for example, a liquid crystal panel, a speaker, or the like.

As shown in FIG. 2, the water supply device 25 includes a water supply case 26, a water supply valve 27, a water supply hose 28, and the like. The water supply valve 27 is connected to the control device 23 and is opened and closed under the control of the control device 23. One end of the water supply hose 28 is connected to the water supply valve 27, and the other end is connected to an external water source such as a water supply. By driving the water supply valve 27 to open and close, the control device 23 supplies water from the water source into the water tank 12 via the water supply hose 28, the water supply valve 27, and the water supply case 26.

As shown in FIG. 3, the washer / dryer 10 includes a circulation air passage 30 and a heat pump unit 40. The circulation air passage 30 is provided on the outside of the water tank 12, and connects the exhaust port 16 and the air supply port 17. Specifically, the circulation air passage 30 includes an exhaust duct 31, a filter device 32, a connection duct 33, a heat exchange unit 34, and an air supply duct 35.

As shown in FIG. 1, the exhaust duct 31 connects the exhaust port 16 of the water tank 12 and the filter device 32. The exhaust duct 31 is composed of, for example, a bellows-shaped hose. The filter device 32 is located above the inner upper part of the outer box 11 and above the water tank 12 and the rotary tank 13. A filter 321 is provided in the filter device 32. The filter device 32 removes foreign matter such as lint contained in the air exhausted from the exhaust port 16 by passing the air exhausted from the exhaust port 16 through the filter 321. The filter device 32 is connected to the upstream side of the heat exchange unit 34 via the connection duct 33. The heat exchange unit 34 is located above the inner upper part of the outer box 11 and above the water tank 12 and the rotary tank 13.

The heat pump unit 40 has a function of generating dry warm air by dehumidifying and heating the air passing through the inside of the heat exchange unit 34 in the circulation air passage 30. In the heat exchange unit 34, an evaporator 41 and a condenser 42 that form a part of the heat pump unit 40 are provided. The evaporator 41 is provided on the upstream side of the condenser 42 with respect to the flow of air in the heat exchange unit 34 during the drying operation. The air passing through the heat exchange unit 34 is cooled by the evaporator 41 and dehumidified by this. The air dehumidified by the evaporator 41 is then heated by the condenser 42 to become warm air.

The downstream side of the heat exchange unit 34 is connected to the air supply port 17 of the water tank 12 via the air supply duct 35. A blower 36 is provided at a connection portion between the heat exchange unit 34 and the air supply duct 35. As shown in FIG. 2, the blower device 36 includes a fan motor 361 and a fan 362. The blower device 36 is configured so that the rotation speed of the fan motor 361, that is, the rotation speed of the fan 362 can be changed by the control of the control device 23. In the following description, the rotation speed of the fan motor 361 and the fan 362 will be referred to as the rotation speed of the blower device 36.

The blower 36 sucks in the air in the heat exchange unit 34 and discharges it to the air supply duct 35 side. As a result, as shown by arrows A in FIGS. 1, 2, and 3, an air flow that circulates in the water tank 12 and the circulation air passage 30 is generated. In this case, looking at the air flow in the circulation air passage 30, the exhaust port 16 is on the most upstream side, and the air supply port 17 is on the most downstream side.

In this configuration, when the compressor 43 and the blower device 36 are driven, the warm air dehumidified and heated in the heat exchange unit 34 is blown by the blower device 36, and the air supply port 17 is passed through the air supply duct 35. Is supplied into the water tank 12. After that, the warm air mainly enters the rotary tub 13 from the communication port 22, raises the temperature of the laundry in the rotary tub 13, and removes moisture from the laundry, and then mainly from the hole 21 of the rotary tub 13. Go outside. Then, the moist air is sucked into the circulation air passage 30 from the exhaust port 16. The air sucked into the circulation air passage 30 first passes through the exhaust duct 31 and the filter device 32. After that, it flows to the heat exchange unit 34 via the connection duct 33. In this way, the air that has entered the circulation air passage 30 from the water tank 12 is dehumidified and heated in the circulation air passage 30, and then supplied to the water tank 12 again.

Next, the heat pump unit 40 will be described. The heat pump unit 40 functions as a hot air supply device for dehumidifying and heating the air flowing into the circulation air passage 30 from the water tank 12 to make it warm air and supplying it to the water tank 12 again. The washer / dryer 10 may be provided with a heater-type hot air supply device instead of the heat pump unit 40.

As shown in FIG. 3, the heat pump unit 40 includes a compressor 43 and a decompression device 44 in addition to the evaporator 41 and the condenser 42. The compressor 43 and the decompression device 44 are provided on the outside of the heat exchange unit 34. The heat pump unit 40 is configured by connecting the condenser 42, the decompression device 44, and the evaporator 41 in an annular shape in order with respect to the direction in which the refrigerant flows with respect to the compressor 43. The evaporator 41 and the condenser 42 are composed of, for example, a pipe having a large number of fins provided at minute intervals, and by passing a refrigerant through the inside of the pipe, heat between the air and the refrigerant passing between the fins is generated. Make a replacement. The evaporator 41 and the condenser 42 function as heat exchangers.

The compressor 43 supplies the refrigerant to the condenser 42 by pressure feeding. The compressor 43 is connected to the control device 23 and is driven and stopped under the control of the control device 23. Further, an accumulator 45 is provided on the suction side 431 of the compressor 43. The accumulator 45 suppresses pressure fluctuations of the refrigerant flowing into the compressor 43. The depressurizing device 44 decompresses the liquid refrigerant by the pressure discharged from the condenser 42 to bring it into a low-pressure gas-liquid mixed state. In this case, the pressure reducing device 44 is composed of, for example, a capillary tube, but may be an electromagnetic opening / closing type expansion valve or the like that can be opened / closed under the control of the control device 23.

As shown in FIGS. 3 and 4, the washing / drying machine 10 includes an air supply temperature sensor 51, an exhaust temperature sensor 52, a compressor temperature sensor 53, a condenser temperature sensor 54, an evaporator inlet temperature sensor 55, and an evaporator outlet temperature. It includes a sensor 56 and an outside temperature sensor 57. The supply air temperature sensor 51, the exhaust temperature sensor 52, the compressor temperature sensor 53, the condenser temperature sensor 54, the evaporator inlet temperature sensor 55, the evaporator outlet temperature sensor 56, and the outside temperature sensor 57 are respectively attached to the control device 23. It is connected.

As shown in FIG. 3, the supply air temperature sensor 51 and the exhaust temperature sensor 52 are provided in the circulation air passage 30, and detect the temperature of the air in the circulation air passage 30. Of these, the air supply temperature sensor 51 is provided between the condenser 42 and the air supply port 17 and in the vicinity of the air supply port 17. The air supply temperature sensor 51 determines the temperature of the air supplied to the water tank 12 and the rotary tank 13 which are the drying chambers through the air supply duct 35, that is, the temperature of the air heated by the heat exchange unit 34 and supplied to the drying chamber. To detect.

The exhaust temperature sensor 52 is provided between the evaporator 41 and the exhaust port 16. In the case of the present embodiment, the exhaust temperature sensor 52 is provided between the evaporator 41 and the exhaust port 16 closer to the exhaust port 16 side. In this case, the exhaust temperature sensor 52 is provided in the circulation air passage 30 downstream of the filter device 32 and upstream of the evaporator 41, but is upstream of the filter device 32, that is, the filter device 32 and the exhaust port. It may be provided between 16 and 16. The exhaust temperature sensor 52 detects the temperature of the air that is exhausted from the water tank 12 and the rotary tank 13 that are drying chambers and passes through the exhaust duct 31.

The compressor temperature sensor 53 is provided in the refrigerant pipe on the discharge side of the compressor 43, and detects the temperature of the refrigerant discharged from the compressor 43, that is, the temperature of the compressor 43. The condenser temperature sensor 54 is provided in the central portion of the condenser 42 and detects the temperature of the condenser 42. The evaporator inlet temperature sensor 55 detects the temperature of the inlet side portion of the evaporator 41, that is, the temperature of the refrigerant flowing into the evaporator 41. The evaporator outlet temperature sensor 56 is provided on the outlet side of the refrigerant with respect to the evaporator 41. The evaporator outlet temperature sensor 56 detects the temperature of the outlet side portion of the evaporator 41, that is, the temperature of the refrigerant flowing out from the evaporator 41.

As shown in FIG. 2, the outside temperature sensor 57 is located inside the outer box 11 outside the heat pump unit 40 and as far away from the heat pump unit 40 as possible, that is, a position that is not easily affected by heat generated in the heat pump unit 40. It is provided in. In this case, the outside temperature sensor 57 is provided inside the outer box 11 and near the outside of the outer box 11. The outside temperature sensor 57 detects the temperature of the air outside the heat pump unit 40 inside the outer box 11, that is, the room temperature of the room in which the washer / dryer 10 is substantially installed.

As shown in FIG. 4, the washer / dryer 10 includes a motor speed detection unit 61, an unbalance detection unit 62, a weight detection unit 63, a cloth quality detection unit 64, and a fan rotation speed detection unit 65. By executing the control program in the CPU, the control device 23 software-uses the motor speed detection unit 61, the unbalance detection unit 62, the weight detection unit 63, the cloth quality detection unit 64, and the fan rotation speed detection unit 65 shown in FIG. Realized virtually by. The control device 23 may realize the motor speed detection unit 61, the unbalance detection unit 62, the weight detection unit 63, the cloth quality detection unit 64, and the fan rotation speed detection unit 65 by hardware such as an integrated circuit. , It may be realized by a combination of software and hardware.

The motor speed detection unit 61 detects the rotation speed of the rotary tank motor 14. The motor speed detection unit 61 may detect the rotation speed of the rotary tank motor 14 by measuring the q-axis current in the vector control of the rotary tank motor 14, for example, or the rotary tank motor 14 is provided with a rotation sensor for rotation. The rotation speed of the rotary tank motor 14 may be detected by a sensor.

The unbalance detection unit 62 is configured so that the storage area 232 of the control device 23 can be accessed. The unbalance detection unit 62 is a command rotation speed Sr, which is the rotation speed instructed by the control device 23 to the rotary tank motor 14 at predetermined intervals, and an actual rotation speed of the rotary tank 13 detected by the motor speed detection unit 61. The difference from the rotation speed Rr is obtained, and the difference between the command rotation speed Sr and the actual rotation speed Rr is stored in the storage area 232. Further, the unbalance detection unit 62 uses the difference between the command rotation speed Sr and the actual rotation speed Rr stored in the storage area 232 to see if the laundry inside the rotary tub 13 is biased, that is, an imbalance occurs. Detects whether or not it is done. Further, the unbalance detection unit 62 detects the magnitude of the unbalance that has occurred based on the magnitude of the difference between the command rotation speed Sr and the actual rotation speed Rr stored in the storage area 232. The unbalance detection unit 62 is not limited to the above-described configuration, and may be configured by, for example, a sensor that directly measures the displacement of the rotary tank 13.

The weight detection unit 63 is configured so that the storage area 232 of the control device 23 can be accessed. The weight detection unit 63 detects the weight of the laundry inside the rotary tub 13. Further, the detected weight of the laundry is stored in the storage area 232. In the present embodiment, the weight detection unit 63 can detect the weight of the laundry between the washing step and the draining step. The weight detection unit 63 detects the current load acting on the rotary tub motor 14 by measuring the q-axis current in the vector control of the rotary tub motor 14, for example, and washes the inside of the rotary tub 13 based on the load. The weight of an object can be measured. The weight detection unit 63 may detect the load on the rotary tank motor 14 from the difference between the commanded rotation speed and the actual rotation speed.

The cloth quality detection unit 64 is configured so that the storage area 232 of the control device 23 can be accessed. The cloth quality detection unit 64 detects the cloth quality of the laundry inside the rotary tub 13. Further, the detected cloth quality of the laundry is stored in the storage area 232. The cloth quality detection unit 64 detects the cloth quality of the laundry based on, for example, the content of water absorbed by the laundry, for example, whether cotton is the main component or chemical fiber is the main component, and the ratio of cotton to chemical fiber. Etc. can be detected. In the present embodiment, the cloth quality detection unit 64 compares the weight of the laundry at the time of drying detected by the weight detection unit 63 with the weight of the laundry containing water during the period from the washing process to the drainage process. , Detects the quality of laundry. The cloth quality detection unit 64 is, for example, two of "cotton-based" indicating that the cloth quality of the laundry is mainly cotton-based clothing and "chemical fiber-based" indicating that the cloth quality of the laundry is mainly chemical fiber-based clothing. It may be judged by classification. In addition, the cloth quality detection unit 64, for example, "almost cotton", "mainly cotton", "mainly chemical fiber" and "almost" in the order of the proportion of cotton being high and the proportion of chemical fiber being small in the cloth quality of laundry. It may be judged in 4 categories of "chemical fiber".

The fan rotation speed detection unit 65 detects the rotation state of the blower device 36. The fan rotation speed detection unit 65 can detect the rotation speed nx of the blower device 36, for example, by detecting the induced voltage of the fan motor of the blower device 36. The fan motor of the blower device 36 may be provided with a rotation detector such as an encoder, and the rotation detector may be used to detect the rotation state of the blower device 36 in terms of hardware.

The control device 23 can selectively execute the washing operation, the drying operation, and the washing / drying operation. The washing / drying operation is an embodiment in which the washing operation is followed by the drying operation. In this case, the control device 23 can selectively execute the final dehydration step in the washing operation when executing the washing / drying operation from the normal dehydration step and the dehydration step by preheat dehydration. In the present embodiment, the normal dehydration step is an embodiment in which the heat pump unit 40 is not driven, that is, centrifugal dehydration is performed without supplying warm air into the water tank 12. On the other hand, the dehydration step by preheat dehydration is a mode in which the heat pump unit 40 is driven to supply warm air into the water tank 12 while centrifugal dehydration is performed.

In the following, the washing and drying operation when preheat dehydration is selected for the final dehydration step will be described with reference to FIGS. 5 to 12. When the washing / drying operation is started (start in FIG. 5), the control device 23 sequentially executes the washing step in step S11, the drainage / dehydrating step in step S12, and the rinsing step in step S13. The washing step, drainage / dehydration step, and rinsing step can be carried out by a commonly known method. If the rinsing step has not been completed a preset number of times (No in step S14), the process returns to step S12 and the drainage / dehydration step and the rinsing step are repeated. Then, when the rinsing step for a preset number of times is completed (Yes in step S14), the drainage step is executed in step S15. The control device 23 controls the drain valve 19 to be opened to drain the water stored in the water tank 12 and the rotary tank 13.

When it is detected by a water level sensor or the like (not shown) that the drainage is completed, the control device 23 performs a preliminary dehydration step in step S20. The pre-dehydration step is a dehydration step performed before the preheat dehydration step performed by supplying warm air into the rotary tank 13, and is performed without supplying warm air into the rotary tank 13. In this case, the maximum rotation speed of the rotary tank 13 in the preliminary dehydration step is equal to or less than the maximum rotation speed of the rotary tank 13 in the preheat dehydration step. That is, the preliminary dehydration step is a step of maintaining the drain valve 19 in an open state without driving the blower 36 and driving the rotary tank 13 at a rotation speed equal to or lower than the target rotation speed in the preheat dehydration step to perform centrifugal dehydration. is there. The control content of pre-dehydration will be described with reference to FIG.

When the pre-dehydration step is executed in step S20 of FIG. 5, the control device 23 executes the process of FIG. The control device 23 first opens the drain valve 19 in step S201. The control device 23 then drives the rotary tank motor 14 in step S202. The control device 23 gradually increases the rotation speed cx of the rotary tub 13 from 0 rpm to a predetermined rotation speed of the rotary tub 13 based on the weight of the laundry, the cloth quality, and the like.

The table of FIG. 8 classifies the conditions for the combination of the weight of the laundry and the cloth quality into four categories (1) to (4). In this case, if the weight of the laundry is 0.0 kg or more and less than 2.0 kg, the condition (1) is set regardless of the cloth quality of the laundry. Further, if the weight of the laundry is 2.0 kg or more and the cloth quality of the laundry is "cotton-based", the condition (2) is set. Further, if the weight of the laundry is 2.0 kg or more and less than 3.0 kg and the cloth quality of the laundry is "chemical fiber type", the condition (3) is set. Then, if the weight of the laundry is 3.0 kg or more and the cloth quality of the laundry is "chemical fiber type", the condition (4) is set. In this case, the control device 23 stores, for example, the data table shown in FIG. 8 in the storage area 232.

The table of FIG. 9 shows the number of stages in the preliminary dehydration step defined for each of the conditions (1) to (4) of FIG. 8, the maximum rotation speed of the rotary tank 13 at each stage, and each rotation. Indicates the maintenance time of the number. In this case, the control device 23 stores, for example, the data table shown in FIG. 9 in the storage area 232. The number of steps in the pre-dewatering step is how many steps are repeated from the start of the rotary tank motor 14 to the stop of the rotary tank motor 14 in the period of the preliminary dehydration step, that is, how many times the rotary tank motor 14 is operated. Indicates whether it has started or stopped. When the preliminary dehydration step is performed in a plurality of stages, the rotation speed of the rotary tank motor 14 is higher in the later stage than in the previous stage. That is, when the preliminary dehydration step is performed in a plurality of stages, the rotation speed of the rotary tank motor 14 is set to increase stepwise.

For example, in the case of condition (1), the number of stages of the preliminary dehydration step is set to two. Further, in the case of the condition (2), the number of steps in the preliminary dehydration step is set to three steps. Then, in the case of the condition (3) or the condition (4), the number of steps in the preliminary dehydration step is set to one step.

Comparing the conditions (2) with each other when the weight is 2.0 kg or more, that is, the conditions (3) and (4), the condition (2) when the cloth quality of the laundry is "cotton-based" is the laundry. Compared with the condition (3) or the condition (4) when the cloth quality is "chemical fiber type", the number of steps in the pre-dehydration step is larger. That is, the time required for dehydration differs depending on the cloth quality of the laundry because the water absorption differs. In other words, when the cloth quality of the laundry is "cotton-based", the water absorption is higher than when the cloth quality of the laundry is "chemical fiber-based". Carefully perform dehydration before the preheat dehydration process.

Further, when comparing the cases of "cotton-based" having the same cloth quality, that is, the condition (1) and the condition (2), the condition (1) in which the weight of the laundry is 0.0 kg or more and less than 2.0 kg is the washing. Compared with the condition (2) when the weight of the object is 2.0 kg or more, the number of steps in the preliminary dehydration step is small. That is, when the weight of the laundry is large, the amount of water absorbed by the entire laundry generally increases, so the number of steps in the pre-dehydration step is increased, and dehydration before the preheat dehydration step is carefully performed.

Here, the maximum rotation speed of the rotary tank 13 in the first stage is the first preliminary dehydration rotation speed u1, the maximum rotation speed of the rotary tank 13 in the second stage is the second preliminary dehydration rotation speed u2, and the rotation in the third stage. The maximum rotation speed of the tank 13 is defined as the third preliminary dehydration rotation speed u3. Further, the period for maintaining the first preliminary dehydration rotation speed u1 in the first stage is defined as the first preliminary rotation speed maintenance period Ti, and the period for maintaining the second preliminary dehydration rotation speed u2 in the second stage is the maintenance of the second preliminary dehydration rotation speed. The period Tj is defined as the period for maintaining the third preliminary dehydration rotation speed u3 in the third stage, and the period for maintaining the third preliminary dehydration rotation speed u3 is defined as the third preliminary rotation speed maintenance period Tk. The first to third preliminary dehydration rotation speeds u1 to u3 can be, for example, 250 rpm to 1000 rpm. Each of the first to third preliminary rotation speed maintenance periods Ti to Tk can be, for example, 1s to 10s.

In the present embodiment, for example, in the case of the condition (1), the first preliminary dehydration rotation speed u1 is 400 rpm, the first preliminary dehydration rotation speed maintenance period Ti is 1s, the second preliminary dehydration rotation speed u2 is 700 rpm, and the second preliminary dehydration rotation speed. The maintenance period Tj is set to 5 s, respectively. Further, in the case of the condition (2), the first preliminary dehydration rotation speed u1 is 400 rpm, the first preliminary dehydration rotation speed maintenance period Ti is 1s, the second preliminary dehydration rotation speed u2 is 780 rpm, and the second preliminary dehydration rotation speed maintenance period Tj is 1s. , The third preliminary dehydration rotation speed u3 is set to 1000 rpm, and the third preliminary rotation speed maintenance period Tk is set to 5 s, respectively. Then, in the case of the condition (3) or the condition (4), the first preliminary dehydration rotation speed u1 is set to 950 rpm, and the first preliminary dehydration rotation speed maintenance period Ti is set to 5 s.

Here, the entire period of the preliminary dehydration step, that is, the period including dehydration at each stage is defined as the preliminary dehydration process period T0. In this case, if the final preliminary stage is the stage in which the rotary tank motor 14 is finally driven within the preliminary dehydration process period T0 under the respective conditions (1) to (4), each preliminary rotation speed is maintained in the case of the final preliminary stage. The period Ti to Tk is 5 s. Further, among the preliminary dehydration maintenance periods, each preliminary rotation speed maintenance period in the stage other than the final preliminary stage is 1 s.

Comparing the conditions (2) and the conditions (3) and (4) when the same weight is 2.0 kg or more, the condition (2) when the cloth quality of the laundry is "cotton-based" is the final preliminary stage. The third preliminary dehydration rotation speed u3, which is the rotation speed, is 1000 rpm, and is the first rotation speed in the final preliminary stage of the condition (3) or the condition (4) when the cloth quality of the laundry is "chemical fiber type". The rotation speed of the rotary tank 13 in the final preliminary stage is higher than that of the preliminary dehydration rotation speed u1 of 950 rpm. That is, when the cloth quality of the laundry is "cotton-based", the water absorption is higher than when the cloth quality of the laundry is "chemical fiber-based", so that the rotation of the rotary tub 13 in the final preliminary stage Increase the number and carefully perform dehydration before the preheat dehydration process.

Comparing the cases of "cotton-based" with the same cloth quality, that is, the condition (1) and the condition (2), the final preliminary stage of the condition (1) in which the weight of the laundry is 0.0 kg or more and less than 2.0 kg. The second preliminary dehydration rotation speed u2, which is the rotation speed of the rotary tank 13, has a larger number of preliminary dehydrations than the condition (2) when the weight of the laundry is 2.0 kg or more. That is, when the weight of the laundry is large, the amount of water absorbed by the entire laundry generally increases, so the number of rotations of the rotary tank 13 in the final preliminary stage is increased, and dehydration before the preheat dehydration step is carefully performed. To do.

In this embodiment, as shown in FIG. 8, the laundry cloth is divided into two categories: "cotton-based", which has a large amount of cotton laundry, and "chemical fiber-based", which has a large amount of chemical fiber laundry. The quality is classified into 3 or more categories, for example, "almost cotton", "mainly cotton", "mainly chemical fiber", in descending order of the proportion of cotton in the entire laundry and the proportion of chemical fiber. The cloth quality of laundry may be classified into 4 categories such as "almost chemical fiber". In that case, the larger the ratio of cotton in the entire laundry, the larger the number of steps in the pre-dehydration process is set, and the larger the ratio of chemical fibers in the entire laundry, the smaller the number of steps in the pre-dehydration process. Set. In addition, the higher the ratio of cotton in the entire laundry, the higher the pre-dehydration rotation speed in the final preliminary stage, and the higher the ratio of chemical fibers in the entire laundry, the higher the pre-dehydration rotation speed in the final preliminary stage. Is set small.

Returning to FIG. 6, the description of the control contents of the preliminary dehydration step will be continued. In step S203, the control device 23 determines whether or not the first preliminary rotation speed maintenance period Ti has elapsed after the rotation speed cx of the rotary tank 13 reaches the first preliminary dehydration rotation speed u1. When the first preliminary rotation speed maintenance period Ti has not elapsed (No in step S203), the control device 23 repeats step S203. Then, when the first preliminary rotation speed maintenance period Ti has elapsed (Yes in step S203), the control device 23 stops the rotary tank motor 14 in step S204.

In step S205, the control device 23 determines whether or not the condition (3) or the condition (4) is satisfied from the cloth quality and weight of the laundry stored in the storage area 232. When the condition (3) or the condition (4) is satisfied (Yes in step S205), the control device 23 advances the process to the return, and in step S30 of FIG. 5, the preheat dehydration step as the final dehydration step is executed. If the condition (3) or the condition (4) is not met (No in step S205), the control device 23 starts the rotary tank motor 14 in step S206.

In step S207, the control device 23 determines whether or not the second preliminary rotation speed maintenance period Tj has elapsed after the rotation speed cx of the rotary tank 13 reaches the second preliminary dehydration rotation speed u2. When the second preliminary rotation speed maintenance period Tj has not elapsed (No in step S203), the control device 23 repeats step S207. Then, when the second preliminary rotation speed maintenance period Tj has elapsed (Yes in step S207), the control device 23 stops the rotary tank motor 14 in step S208.

In step S209, the control device 23 determines whether or not the condition (1) is satisfied from the cloth quality and weight of the laundry stored in the storage area 232. When the condition (1) is satisfied (Yes in step S209), the control device 23 advances the process to the return, and in step S30 of FIG. 5, the preheat dehydration step as the final dehydration step is executed. If the condition (1) is not met (No in step S209), the control device 23 starts the rotary tank motor 14 in step S210.

In step S211 the control device 23 determines whether or not the third preliminary rotation speed maintenance period Tk has elapsed after the rotation speed cx of the rotary tank 13 reaches the third preliminary dehydration rotation speed u3. When the third preliminary rotation speed maintenance period Tk has not elapsed (No in step S211), the control device 23 repeats step S211. Then, when the third preliminary rotation speed maintenance period Tk has elapsed (Yes in step S211), the control device 23 stops the rotary tank motor 14 in step S212. Then, the control device 23 completes (returns) the preliminary dehydration step.

When the pre-dehydration step is completed, the control device 23 proceeds to step S30 of FIG. 5 to execute the preheat dehydration step as the final dehydration step. The control content of the preheat dehydration step will be described with reference to FIG. When the preheat dehydration step is executed, the control device 23 rotates the blower device 36 at the initial rotation speed n1 in step S301. The control device 23 also opens the drain valve 19 in step S301. The initial rotation speed n1 of the blower device 36 is a rotation speed per unit time of the blower device 36 set in advance according to the weight of the laundry, the cloth quality of the laundry, and the like. The initial rotation speed n1 of the blower 36 can be set, for example, in the range of 1000 rpm to 3000 rpm. In the case of this embodiment, the initial rotation speed n1 is set to, for example, 2350 rpm. In another embodiment, the initial rotation speed n1 may be set to, for example, 1500 rpm.

To open the drain valve 19 in step S301, it is necessary to open the drain valve 19 in the closed state and keep the drain valve 19 in the open state as it is. Including. That is, in the previous step, in the present embodiment, when the drain valve 19 is already in the open state in the drain step of step S15, in order to open the drain valve 19, the open state of the drain valve 19 is maintained. Including that.

The control device 23 repeats step S302 from the start of driving the blower device 36 until a predetermined period Ta elapses (No in step S302). The predetermined period Ta is set, for example, in the range of 15s to 60s. Then, when the control device 23 determines that Ta has elapsed for a predetermined period after starting the rotation of the blower device 36 (Yes in step S302), the control device 23 starts the rotation of the rotary tank motor 14 in step S303. The control device 23 controls the rotation of the rotary tank motor 14 so as to gradually increase the rotation speed of the rotary tank motor 14 from 0 rpm to the target speed ct. The target speed ct is the number of rotations of the rotary tub motor 14 set in advance according to the weight of the laundry and the cloth quality of the laundry. In this embodiment, the rotation speed of the rotary tank motor 14 and the rotation speed of the rotary tank 13 are synonymous. In the case of the present embodiment, the target speed ct is set in the range of, for example, 1000 rpm to 1500 rpm.

Next, in step S304, the control device 23 determines whether or not the rotation speed cx of the rotary tank 13 has reached the first rotation speed c1 by the motor speed detection unit 61. The first rotation speed c1 is a reference for determination when starting the drive of the heat pump unit 40, and is the rotation speed of the rotary tank 13, that is, the rotation speed of the rotary tank motor 14.

The first rotation speed c1 is set in advance according to, for example, the weight of the laundry, the cloth quality of the laundry, and the like. Further, the first rotation speed c1 is set within the range from 0 rpm to the target speed ct. In the present embodiment, the first rotation speed c1 is set to, for example, 400 rpm, which is 1/2 or less of the target speed ct, and further 1/3 or less. When it is detected that the rotation speed cx of the rotary tank 13 is less than the first rotation speed c1 (No in step S304), the control device 23 repeats step S304. When it is detected that the rotation speed cx of the rotary tank 13 is equal to or higher than the first rotation speed c1 (Yes in step S304), the process proceeds to step S305.

The control device 23 drives the heat pump unit 40 in step S305. Specifically, the control device 23 drives the compressor 43. Next, in step S306, the control device 23 determines whether or not the rotation speed cx of the rotary tank 13 has reached the second rotation speed c2. The second rotation speed c2 is set in advance according to, for example, the weight of the laundry, the cloth quality of the laundry, and the like. The second rotation speed c2 is higher than the first rotation speed c1 and lower than the target speed ct. For example, the second rotation speed c2 can be set to 1/2 or more of the target speed ct. In the present embodiment, the second rotation speed c2 is set to 950 rpm.

When the rotation speed cx of the rotary tank 13 is less than the second rotation speed c2 (No in step S306), the control device 23 repeats step S306. When the rotation speed cx of the rotary tank 13 becomes the second rotation speed c2 or more (Yes in step S306), the control device 23 proceeds to the process in step S307. Here, the period from the start of the preheat dehydration step to the determination that the rotation speed cx of the rotary tank 13 has reached the second rotation speed c2 in step S306 is referred to as a first period T1. That is, the first period T1 is a period after the start of the preheat dehydration step and before the rotation speed cx of the rotary tank 13 reaches the target speed ct, and the blower 36 is driven at the initial rotation speed n1 and the drain valve. This is the period for keeping 19 open.

In step S307, the control device 23 lowers the rotation speed nx of the blower device 36 from the initial rotation speed n1. In the present embodiment, the control device 23 reduces the rotation speed nx of the blower device 36 to the second rotation speed n2. The second rotation speed n2 is 0 rpm, or a rotation speed higher than 0 rpm and lower than the initial rotation speed n1. The second rotation speed n2 may be a rotation speed that generates a circulating air at a speed that does not cause the water in the drainage ditch to be blown through the open drain valve 19. The second rotation speed n2 can be set, for example, in the range of 250 rpm to 1000 rpm. In the present embodiment, the second rotation speed n2 is set to 500 rpm.

Next, in step S308, the control device 23 operates the unbalance detection unit 62 to detect the unbalance of the rotation of the rotary tub 13, that is, the imbalance of the arrangement of the laundry in the rotary tub 13. In the present embodiment, the imbalance is detected in the preheat dehydration step, but the imbalance may be detected in the pre-dehydration step. Further, the imbalance may be detected in both the pre-dehydration step and the preheat dehydration step. The control device 23 can classify the rotation imbalance into, for example, four categories based on the presence / absence and magnitude of the imbalance detected by the imbalance detection unit 62. The control device 23 classifies the unbalanced rotation into, for example, "small unbalanced", "medium unbalanced", "large unbalanced", and "redo" in ascending order of unbalanced rotation. If the unbalance of rotation is not detected, it is included in "small unbalance". Further, when the control device 23 determines that "redo" is performed (Yes in step S309), the process is returned to step S13 of FIG. 5 and the rinsing step is executed again to eliminate the imbalance in the arrangement of the laundry.

When the detection result of the unbalance detection unit 62 is not "redo" (No in step S309), that is, when it is any of "small unbalance", "medium unbalance", and "large unbalance". The control device 23 proceeds to the process in step S310. The control device 23 corrects the target speed ct of the rotary tank 13 in step S310. Further, the control device 23 sets a target speed maintenance period Tb, which is an operation time at the target speed ct. That is, the target speed maintenance period Tb is a period for maintaining the target speed ct.

The correction of the target speed ct of the rotary tub 13 and the setting of the target speed maintenance period Tb are, for example, any one of the weight of the laundry, the cloth quality of the laundry, or the detection result of imbalance, or a combination of two or more of them. Can be done based on. In the present embodiment, the control device 23 corrects the target speed ct of the rotary tub 13 based on the detection result of the weight of the laundry, the cloth quality of the laundry, and the imbalance, and maintains the target speed at the target speed ct. Set the period Tb.

Specifically, the control device 23 determines a condition based on the combination of the weight of the laundry and the cloth quality, and further determines the target speed ct and the target speed ct based on the condition and the imbalance detection result. The target speed maintenance period Tb, which is the period to be maintained, is set. In this case, the control device 23 stores, for example, the data tables shown in FIGS. 8 and 11 in the storage area 232.

In the table of FIG. 11, the target speed ct and the target speed maintenance time Tb are set based on the combination of the conditions set in FIG. 8 and the imbalance detection result. In this case, under the condition (1), the target speed ct and the target speed maintenance time Tb are set to be constant regardless of whether the imbalance detection result is large, medium, or small. Further, in the cases of the conditions (2) to (4), the larger the imbalance detection result, the lower the target speed ct and the longer the target speed maintenance period Tb.

In this case, in relation to the weight of the laundry, the heavier the weight of the laundry, the longer the target speed maintenance period Tb is set. That is, as the total amount of laundry increases, the amount of water absorbed by the entire laundry generally increases, so that the time for dehydrating the rotary tub 13 at high speed is lengthened. In this case, the weight of the laundry is divided into a plurality of categories, for example, less than 2.0 kg and 2.0 kg or more. Then, for the same target speed ct, the target speed maintenance period Tb is set for each category.

For example, when the condition (1) and the condition (2) are compared, the weight of the laundry is heavier in the condition (2) than in the condition (1). When the target speed ct is 1000 rpm, the target speed maintenance period Tb of the condition (2) is set to 485 s, which is longer than the target speed maintenance period Tb of the condition (1) of 305 s. Further, for example, when the condition (1) is compared with the conditions (3) and (4), the weight of the laundry is heavier in the conditions (3) and (4) than in the condition (1). When the target speed ct is 1000 rpm, the target speed maintenance period Tb of the conditions (3) and (4) is set to 660 s, which is longer than the target speed maintenance period Tb of 305 s of the condition (1). ..

Further, in relation to the cloth quality of the laundry, when the cloth quality of the laundry is mainly composed of chemical fibers, the target speed maintenance period Tb is compared with the case where the cloth quality of the laundry is mainly composed of cotton. Is set long. This is because when the cloth quality of the laundry is mainly cotton, dehydration is performed more carefully in the above-mentioned pre-dehydration step than when the cloth is mainly composed of chemical fibers, and preheat dehydration is performed. This is because the amount of water remaining in the laundry at the start of the process is small. For example, when looking at the case where the target speed ct is 1400 rpm under the "cotton-based" condition (2) and the "chemical fiber-based" condition (4), the target speed maintenance period of the "chemical fiber-based" condition (4) Tb is set to 480 s, which is longer than 300 s of the target speed maintenance period Tb of the condition (2).

Further, for example, in the case of the "cotton-based" condition (2) and the "chemical fiber-based" conditions (3) and (4) when the target speed ct is 1200 rpm, the "chemical fiber-based" condition (3) ) And (4), the target speed maintenance period Tb is set to 575s, which is longer than the target speed maintenance period Tb of the condition (2) of 385s. Further, for example, in the case of the "cotton-based" condition (2) and the "chemical fiber-based" conditions (3) and (4) when the target speed ct is 1000 rpm, the "chemical fiber-based" condition (3) ) And (4), the target speed maintenance period Tb is set to 660 s, which is longer than the target speed maintenance period Tb of the condition (2) of 485 s.

It should be noted that there are three or more categories, for example, "almost cotton", "mainly cotton", "mainly chemical fiber", and "almost chemical fiber" in descending order of the proportion of cotton in the entire laundry and the proportion of chemical fiber. The cloth quality of the laundry may be classified into 4 categories as described above. In that case, the higher the ratio of cotton in the entire laundry, the shorter the target speed maintenance period Tb is set, and the larger the ratio of chemical fibers in the entire laundry, the longer the target speed maintenance period Tb is set. To. This is because, as described above, the higher the ratio of cotton in the entire laundry, the more carefully the dehydration is performed in the pre-dehydration step than in the case where the ratio of chemical fibers in the entire laundry is large, and preheat dehydration is performed. This is because the amount of water remaining in the laundry at the start of the process is small.

Next, in step S311, the control device 23 determines whether or not a predetermined period Tc has elapsed since the rotation speed cx of the rotary tank 13 reached the target speed ct. The predetermined period Tc may be any time as long as the water discharged from the laundry is sufficiently dehydrated by high-speed rotation at the target speed ct and the water is discharged from the drainage unit 18 to the outside of the machine, for example, in the range of 150 s to 210 s. Can be set within. In the present embodiment, the predetermined period Tc is constant and is set to, for example, 180 s.

When the predetermined period Tc has not elapsed since the rotation speed cx of the rotary tank 13 reached the target speed ct (No in step S311), the control device 23 sets the rotation speed nx of the blower 36 to the second rotation speed n2. And keep the drain valve 19 open. Then, when a predetermined period Tc elapses after the rotation speed cx of the rotary tank 13 reaches the target speed ct (Yes in step S311), the control device 23 proceeds to the process in step S312.

In step S312, the control device 23 increases the rotation speed nx of the blower device 36 to a value higher than the initial rotation speed n1. In the present embodiment, the control device 23 increases the rotation speed nx of the blower device 36 to the third rotation speed n3. The third rotation speed n3 is a rotation speed higher than the second rotation speed n2 and a value higher than the initial rotation speed n1. The third rotation speed n3 can be set, for example, in the range of 1500 rpm to 4500 rpm. In the case of this embodiment, the third rotation speed n3 is set to, for example, 3900 rpm.

Further, in step S312, the control device 23 closes the drain valve 19. That is, the drain valve 19 is in an open state from the start of the preheat dehydration step to step S311. The drain valve 19 is then closed in step S312, after which it is closed until the preheat dehydration and subsequent drying steps are complete.

Here, the period from when the rotation speed cx of the rotary tank 13 reaches the second rotation speed c2 to when the rotation speed cx of the rotary tank 13 reaches the target speed ct is referred to as a second period T2. The second period T2 is a period after the first period T1 and before the rotation speed cx of the rotary tank 13 reaches the target speed ct, and the rotation speed nx of the blower 36 is set from the initial rotation speed n1. It is a period during which the second rotation speed n2 is maintained and the drain valve 19 is maintained in an open state.

The period from when the rotation speed cx of the rotary tank 13 reaches the target speed ct until the rotation speed nx of the blower device 36 is increased to the third rotation speed n3 is referred to as a third period T3. The third period T3 is a period after the second period T2, in which the rotation speed cx of the rotary tank 13 is maintained at the target speed ct and the rotation speed nx of the blower 36 is lower than the initial rotation speed n1. This is a period during which the drain valve 19 is maintained in an open state while maintaining the second rotation speed n2. That is, the length of the third period corresponds to the predetermined period Tc.

Further, the period from the decrease of the rotation speed nx of the blower device 36 to the second rotation speed n2 to the increase of the rotation speed nx of the blower device 36 to the third rotation speed n3 is referred to as a rotation speed reduction period Td. The length of the combined period of the second period T2 and the third period T3 corresponds to the rotation speed decrease period Td.

Next, in step S313, the control device 23 determines whether or not the target speed maintenance period Tb set in step S310 has elapsed since the rotation speed cx of the rotary tank 13 reached the target speed ct. When it is determined that the target speed maintenance period Tb has not elapsed since the rotation speed cx of the rotary tank 13 reached the target speed ct (No in step S313), the control device 23 repeats step S313. When it is determined that the target speed maintenance period Tb has elapsed since the rotation speed cx of the rotary tank 13 reached the target speed ct (Yes in step S313), the control device 23 proceeds to the process in step S314. Then, the control device 23 decelerates or stops the rotary tank motor 14 and the rotary tank 13 in step S314. Then, the control device 23 completes the preheat dehydration step (return), and executes the drying operation in step S17 of FIG.

Here, the period from the increase of the rotation speed nx of the blower 36 to the third rotation speed n3 to the lapse of the operation time at the target speed ct, that is, the target speed maintenance period Tb is referred to as the fourth period T4. The fourth period T4 is a period after the third period T3, in which the rotation speed cx of the rotary tank 13 is maintained at the target speed ct and the rotation speed nx of the blower 36 is increased from the initial rotation speed n1. This is a period during which the drain valve 19 is maintained in a closed state while maintaining the third rotation speed n3. That is, the length of the combined period of the third period T3 and the fourth period T4 coincides with the target speed maintenance period Tb.

Here, usually, a house or the like where the washer / dryer 10 is installed is provided with a drainage facility for draining the wastewater discharged from the washer / dryer 10 into the sewage. Although the details are not shown, the drainage facility includes a drainage pipe connected to the sewage, a drainage trap provided in the middle of the drainage pipe, and the like. The drain trap can prevent backflow of sewage such as a foul odor by always storing water in the drain trap and sealing the drain pipe.

When the washer / dryer 10 executes the above-mentioned preheat dehydration step, in order to properly drain the water discharged from the laundry with the rotation of the rotary tub 13 to the outside of the water tub 12, the drainage of the washer / dryer 10 is performed. It is preferable to keep the valve 19 open for as long as possible. However, if the preheat dehydration step is performed with the drain valve 19 open, the water in the drain trap may be blown off by the warm air discharged to the outside of the water tank 12 through the drain valve 19. Then, the inside of the water tank and the drain pipe communicate with each other, and the drain trap does not function, which may cause the odor of sewage to flow into the water tank 12. As a result, there is a concern that the water tank 12 will be filled with the odor of sewage and the laundry will be odorized.

In this case, by performing the preheat dehydration step with the drain valve 19 closed, it is possible to prevent the backflow of the sewage odor. However, if the preheat dehydration step is performed with the drain valve 19 closed, the water discharged from the laundry is not drained to the outside of the water tank 12 and remains in the water tank 12. Then, the water accumulated in the water tank 12 is carried by the circulating air and reaches the filter device 32 provided in the middle of the circulating air passage, which may wet the filter 321 and the collected lint. When the filter 321 and the collected lint get wet, the flow of air in the circulation air passage 30 is obstructed and the amount of air circulation decreases, so that the temperature of the laundry does not rise easily, and the drying operation time is rather extended. There is a possibility that it will end up.

Therefore, the washer / dryer 10 of the present embodiment includes a water tank 12, a rotary tank 13, a rotary tank motor 14, a circulation air passage 30, a blower 36, a heat pump unit 40, a filter device 32, and a drain hose. 20, a drain valve 19, and a control device 23 are provided. The water tank 12 can store water inside. The rotary tub 13 is rotatably provided in the water tub 12 and can accommodate laundry inside. The rotary tank motor 14 rotationally drives the rotary tank 13. The circulation air passage 30 is provided outside the water tank 12 and connects the exhaust port 16 and the air supply port 17 of the water tank 12. The blower device 36 is provided in the middle of the circulation air passage 30 and has a function of blowing air into the water tank 12 and the rotary tank 13.

It functions as a hot air supply device that heats the air in the heat pump unit 40 and the circulation air passage 30. The filter device 32 is provided in the middle of the circulating air passage 30 and has a function of collecting lint contained in the air flowing through the circulating air passage 30. The drain hose 20 functions as a drainage route for draining the water in the water tank 12 to the outside. The drain valve 19 opens and closes between the drain path, that is, the drain hose 20 and the drain port 123. The control device 23 controls the drive of the rotary tank motor 14, the blower device 36, the heat exchange unit 34, and the drain valve 19. The control device 23 can execute a preheat dehydration step of driving the heat exchange unit 34 to supply warm air into the rotary tank 13 and increasing the rotation speed cx of the rotary tank 13 to a target speed to perform centrifugal dehydration.

The preheat dehydration step includes a first period T1, a second period T2, a third period T3, and a fourth period T4. The first period T1 is a period before the rotation speed cx of the rotary tank 13 reaches the target speed, and is a period during which the blower 36 is driven at the initial rotation speed n1 and the drain valve 19 is maintained in an open state. is there. The second period T2 is a period after the first period T1 and before the rotation speed cx of the rotary tank 13 reaches the target speed ct, and the rotation speed nx of the blower 36 is set from the initial rotation speed n1. It is a period during which the drain valve 19 is maintained in an open state as well as in a lowered state.

The third period T3 is a period after the second period T2, in which the rotation speed cx of the rotary tank 13 is maintained at the target speed ct and the rotation speed nx of the blower 36 is lower than the initial rotation speed n1. This is a period during which the drain valve 19 is maintained in an open state as well as being maintained in a closed state. The fourth period T4 is a period after the third period T3, in which the rotation speed cx of the rotary tank 13 is maintained at the target speed ct, and the rotation speed nx of the blower 36 is set from the initial rotation speed n1. This is the period during which the drain valve 19 is maintained in the closed state while maintaining the increased state.

According to this, since the rotary tank 13 is rotated while the drain valve 19 is kept open during the first period T1 to the third period T3, the water discharged from the wet laundry is sufficiently drained from the drain hose. It is discharged to the outside of the machine through 20. Therefore, even if the rotation speed nx of the blower device 36 is maintained at a high speed in the fourth period T4 following the third period T3, the moisture discharged from the laundry may reach the filter device 32 through the circulation air passage 30. It will be reduced. As a result, the possibility of wetting the filter 321 and the collected lint is reduced, so that the air flow in the circulation air passage 30 is less likely to be obstructed. Therefore, it is possible to suppress a decrease in the amount of air circulation, and it is difficult to prevent the laundry from drying.

Then, between the second period T2 after the rotation speed cx of the rotary tank 13 reaches the second rotation speed c2, which is relatively high speed, and the third period T3 after reaching the target speed ct, the blower 36 Since the rotation speed nx is maintained in a state lower than the initial rotation speed n1, even if the drain valve 19 is kept in the open state, the water in the drain trap is not excessively blown by the circulating wind. Therefore, since the function of the drain trap is not easily impaired, it is possible to prevent the bad odor of the sewage from flowing back to the rotary tub 13 and adhering the odor to the laundry. Then, in the fourth period T4, since the drain valve 19 is maintained in the closed state, even if the rotation speed nx of the blower device 36 is maintained higher than the initial rotation speed n1, it becomes difficult for the water in the drain trap to fly. Backflow of sewage malodor to the rotary tank 13 can be effectively suppressed.

As described above, according to the present embodiment, the moisture discharged from the laundry is appropriately discharged to the outside of the water tank 12, and the filter 321 and the collected lint are suppressed from getting wet, so that the air flowing through the circulation air passage 30 is prevented. A sufficient amount can be secured and the inflow of foul odor from sewage can be prevented. As a result, according to the washer / dryer 10 of the present embodiment, the effect of preheat dehydration can be improved.

(Second Embodiment)
Next, the second embodiment will be described with reference to FIG.
Conventionally, when there is an imbalance in the rotation of the rotary tank during the dehydration process, the rotation speed of the rotary tank is controlled. That is, when the rotation is unbalanced due to the unevenness of the laundry in the rotary tub, if the rotary tub is continuously rotated at high speed, a load is applied to the rotary tub motor, which may cause a failure or the like. Therefore, when the rotation imbalance is detected, the maximum rotation speed of the rotary tank in the dehydration step is suppressed, and the load on the rotary tank motor is reduced. However, if the rotation speed of the rotary tank is suppressed, the time required for dehydration generally becomes long, so it is necessary to lengthen the operation time at the maximum rotation speed. Therefore, even if an imbalance is detected, if the rotation speed of the rotary tank is uniformly suppressed regardless of the magnitude of the imbalance, the time required for the dehydration process may be prolonged and the convenience of the user may be impaired. There is.

In the present embodiment, the control device 23 detects the imbalance by the unbalance detection unit 62 before the rotation speed cx of the rotary tank 13 reaches the target speed ct. Then, in step S310 of FIG. 7, as shown in FIG. 13, the larger the imbalance detected by the unbalance detection unit 62, the smaller the target speed ct and the longer the third period T3.

For example, in the case of the condition (1), the third period T3 is set to 180s. Further, in the case of the condition (2), if the detection result of the unbalance detection unit 62 is "small", the third period T3 is set to 180s. If the detection result of the unbalance detection unit 62 is "medium", the third period T3 is set to 200s. If the detection result of the unbalance detection unit 62 is "large", the third period T3 is set to 220s.

Further, in the case of the condition (3), if the detection result of the unbalance detection unit 62 is "small" or "medium", the third period T3 is set to 200s. If the detection result of the unbalance detection unit 62 is "large", the third period T3 is set to 220s.

Further, in the case of the condition (4), if the detection result of the unbalance detection unit 62 is "small", the third period T3 is set to 180s. If the detection result of the unbalance detection unit 62 is "medium", the third period T3 is set to 200s. If the detection result of the unbalance detection unit 62 is "large", the third period T3 is set to 220s.

As described above, according to the present embodiment, the washer / dryer 10 further includes an unbalance detection unit 62 that detects the unbalance of the rotation of the rotary tub 13. The control device 23 detects the imbalance by the unbalance detection unit 62 before the rotation speed cx of the rotary tank 13 reaches the target speed ct, and the larger the unbalance detected by the unbalance detection unit 62, the higher the target speed. The ct is reduced and the third period is lengthened.

According to this, even if the target speed ct is reduced when the unbalance of the rotary tank 13 is large, the drain valve 19 is maintained in the open state and dehydrated at the target speed ct by setting the third period T3 for a long time. Since the period for performing the above can be secured, the same effect as that of the first embodiment can be obtained more reliably. Further, when the imbalance of the rotary tank 13 is small, the target speed ct is set to be large, so that the laundry is efficiently dehydrated and drained to the outside in a short period of time, which is also the first embodiment. The same effect as the above can be obtained more reliably.

In the present embodiment, even if the third period T3 is set based on the imbalance determination result, the target speed maintenance period Tb is set in the same manner as the target speed maintenance period Tb of the first embodiment shown in FIG. .. That is, although the length of the combined period of the third period T3 and the fourth period T4 has not been changed, the target speed maintenance period Tb may be changed according to the change in the length of the third period T3.

That is, for example, in the case of the condition (2), if the detection result of the unbalance detection unit 62 is "small", the third period T3 is 180s, which is the same as the case of the first embodiment, and therefore the target speed maintenance period. Tb may also be 300 s as in the first embodiment. If the detection result of the unbalance detection unit 62 is "medium", the third period T3 is 200s, so the target speed maintenance period Tb may be set to 405s. Further, if the detection result of the unbalance detection unit 62 is "large", the third period T3 is 220s, so the target speed maintenance period Tb may be set to 505s. The same applies to other conditions.

(Third Embodiment)
Next, the third embodiment will be described with reference to FIG.
The amount of water contained in the entire laundry varies depending on the weight of the laundry contained in the rotary tub 13. For example, when the weight of the laundry is heavy, it is generally considered that the laundry is bulky, and the amount of water contained in the entire laundry is considered to be large. Therefore, when the weight of the laundry is heavy, the time required to discharge a certain amount of water becomes long.

In the present embodiment, the control device 23 detects the weight of the laundry by the weight detecting unit 63 in a step before the start of the preheat dehydration step, that is, in a washing step or the like. Then, as shown in FIG. 14, the control device 23 lengthens the third period T3 as the weight of the laundry detected by the weight detecting unit 63 increases in step S310. Further, the control device 23 detects the cloth quality of the laundry by the cloth quality detection unit 64 in the step before the start of the preheat dehydration step, that is, the washing step and the like, and in step S310, as shown in FIG. 14, the weight detection unit When the cloth quality of the laundry detected by 63 is mainly composed of chemical fibers, the third period T3 is lengthened as compared with the case where the cloth quality of the laundry is mainly composed of cotton. That is, when the cloth quality of the laundry is mainly composed of cotton, the third period T3 is shortened as compared with the case where the cloth quality is mainly composed of chemical fibers. This is because when the cloth quality of the laundry is mainly cotton, dehydration is performed more carefully in the above-mentioned pre-dehydration step than when the cloth is mainly composed of chemical fibers, and preheat dehydration is performed. This is because the amount of water remaining in the laundry at the start of the process is small.

For example, in the case of condition (1), that is, when the cloth quality of the laundry is "cotton-based" or "chemical fiber-based" and the weight of the laundry is less than 2.0 kg, that is, 0.0 kg to 1.9 kg, the third The period T3 is set to 180 s. Further, when the condition (2), that is, the cloth quality of the laundry is "cotton-based" and the weight of the laundry is 2.0 kg or more, the third period T3 is set to 200 s. Further, in the case of the condition (3), that is, when the cloth quality of the laundry is "chemical fiber type" and the weight of the laundry is 2.0 kg to 2.9 kg, the third period T3 is set to 220 s. Further, in the case of the condition (4), that is, when the cloth quality of the laundry is "chemical fiber type" and the weight of the laundry is 2.0 kg or more, the third period T3 is set to 240 s.

In this case, looking at the conditions (1) and (2) in which the weight of the laundry is different, the third period T3 is set to 200s under the condition (2) in which the weight of the laundry is heavier than the condition (1). This is longer than 180s of the third period T3 in the condition (1). Looking at the condition (1) in which the weight of the laundry is different and the conditions (3) and (4), the third period T3 is 220 s under the condition (3) in which the weight of the laundry is heavier than the condition (1). It is set, which is longer than 180s of the third period T3 in the condition (1). Similarly, in the condition (4) where the weight of the laundry is heavier than the condition (3), the third period T3 is set to 240s, which is longer than the 200s of the third period T3 in the condition (3).

Looking at the conditions (2) and the conditions (3) and (4) in which the weight of the laundry is the same but the cloth quality is different, the third period T3 under the conditions (3) and (4) mainly composed of chemical fibers. Is set to 220 s and 240 s, respectively, which is longer than the 200 s of the third period T3 under the cotton-based condition (2).

As described above, according to the present embodiment, the washer / dryer 10 further includes a weight detection unit 63 that detects the weight of the laundry housed in the rotary tub 13. The control device 23 lengthens the third period T3 as the weight of the laundry detected by the weight detecting unit 63 becomes heavier. According to this, when the weight of the laundry is heavy, it is possible to extend the period for keeping the drain valve 19 in the open state while operating at the target speed ct, and to sufficiently drain the water to the outside of the machine. The same effect as that of the first embodiment can be obtained more reliably. Further, when the weight of the laundry is not so heavy, it is considered that the total amount of water contained in the laundry is also small. Therefore, the amount of water discharged from the laundry is carried to the filter 321 by the circulating air, and the filter 321 or Since it is considered that the period required for draining the collected lint to the extent that it can be suppressed from getting wet is also shortened, the third period T3 is shortened, and the same effect as that of the first embodiment is obtained while efficiently performing the dehydration step. Can be obtained.

Further, according to the present embodiment, the washer / dryer 10 further includes a cloth quality detecting unit 64 for detecting the cloth quality of the laundry housed in the rotary tub 13. The control device 23 is executed before the preheat dehydration step, keeps the drain valve 19 open without driving the blower 36, and drives the rotary tank 13 at a rotation speed of ct or less to perform centrifugal dehydration. Preliminary dehydration steps to be performed can be further performed.
The control device 23 sets the number of steps, which is the number of starts and stops of the rotary tub motor 14 in the preliminary dehydration step, according to the cloth quality of the laundry detected by the cloth quality detection unit 64. When the cloth quality of the laundry detected by the cloth quality detection unit 64 is mainly composed of chemical fibers, the control device 23 has a number of steps in the preliminary dehydration step as compared with the case where the cloth quality is mainly composed of cotton. To lengthen the third period T3.

Since the water absorption and dehydration are different depending on the cloth quality of the laundry, the period required for a certain amount of water to be discharged from the laundry is different. Since the water absorption of the laundry mainly composed of chemical fibers is lower than that of the laundry mainly composed of cotton, the number of steps in the pre-dehydration step can be reduced and the washing and drying operation can be efficiently performed. On the other hand, since the number of steps in the preliminary dehydration step is reduced, in the preheat dehydration step, the moisture discharged from the laundry is dehydrated to the extent that it does not move to the filter device 32 due to the circulating air blown by the blower device 36. By securing the time required for the operation, that is, by prolonging the period for maintaining the drain valve 19 in the open state while operating at the target speed ct, the drainage valve 19 is sufficiently drained to the outside of the machine. Therefore, the same effect as that of the first embodiment can be obtained more reliably, and efficient washing and drying operation becomes possible.

(Fourth Embodiment)
Next, the fourth embodiment will be described with reference to FIGS. 3, 4, and 15.
If the temperature in the circulation air passage 30, the temperature of the refrigerant in the heat pump unit 40, the temperature of the room in which the washer / dryer 10 is installed, and the like are high, the temperatures inside the water tank 12 and the rotary tank 13 which are the drying chambers are also high. Expected to be higher. That is, the supply air temperature sensor 51, the exhaust temperature sensor 52, the compressor temperature sensor 53, the condenser temperature sensor 54, the evaporator inlet temperature sensor 55, the evaporator outlet temperature sensor 56, and the outside temperature sensor 57 are directly or indirectly. It can be said that the temperature inside the water tank 12 and the rotary tank 13 which are drying chambers can be measured.

In the present embodiment, when the preheat dehydration step is started, the supply air temperature sensor 51, the exhaust temperature sensor 52, the compressor temperature sensor 53, the condenser temperature sensor 54, and evaporation are performed at predetermined timings instructed by the control device 23. The vessel inlet temperature sensor 55, the evaporator outlet temperature sensor 56, and the outside temperature sensor 57 measure the temperature. For example, the control device 23 instructs to measure the temperature when the heat pump unit 40 is driven in step S23. Then, the storage area 232 stores each measured temperature.

In the present embodiment, the control device 23 measures the temperature at each location by the temperature sensors 51 to 57 before the rotation speed cx of the rotary tank 13 reaches the target speed ct. Then, in step S310, the control device 23 sets the third period T3 according to the temperature measured by each of the temperature sensors 51 to 57 as shown in FIG. The control device 23 may set the third period T3 based on the measurement results of one or a plurality of temperature sensors among the temperature sensors 51 to 57. For example, in the present embodiment, the third period T3 can be set using the temperature measured by the outside temperature sensor 57 as the temperature measured by the temperature sensors 51 to 57.

In this case, in any of the conditions (1) to (4), if the temperature outside the machine is less than 10 ° C., the third period T3 is set to 180 s. If the temperature outside the machine is 10 ° C to 20 ° C, the third period T3 is set to 200 s. If the temperature outside the machine is 20 ° C. or higher, the third period T3 is set to 220 s.

According to the present embodiment, the washing / drying machine 10 directly or indirectly measures the temperature in the water tank 12, for example, an air supply temperature sensor 51, an exhaust temperature sensor 52, a compressor temperature sensor 53, and a condenser. It includes a temperature sensor 54, an evaporator inlet temperature sensor 55, an evaporator outlet temperature sensor 56, and an outside temperature sensor 57. The control device 23 shortens the third period T3 as the temperature measured by each of the temperature sensors 51 to 57 increases.

That is, if the temperature inside the water tank 12 is high, the water contained in the laundry and the water dehydrated from the laundry are likely to evaporate, and the laundry is likely to dry faster. That is, the water contained in the laundry is discharged from the laundry not only as liquid water but also as gaseous water vapor, but the higher the temperature in the water tank 12, the more water is discharged as water vapor, and the liquid water. The amount of water discharged is reduced. Therefore, when the temperature inside the water tank 12 is high, the period required to prevent the filter 321 and the collected lint from being wetted by discharging the water from the laundry is shortened, so that the third period T3, that is, The period of dehydration at the target speed ct is shortened while the drain valve 19 is maintained in the open state.

Further, when the temperature inside the water tank 12 is high, it is considered that the temperature of the drainage portion 18 is also high, and it can be said that the water in the drainage trap is likely to evaporate. Therefore, when the temperature inside the water tank 12 is high, shortening the third period T3 shortens the period for keeping the drain valve 19 in the open state, and thereby there is a risk that the water in the drain trap will be blown off. Can be reduced.

In the present embodiment, the target speed maintenance period Tb is the same as in the first embodiment regardless of the temperature outside the machine, but the target speed maintenance period Tb is changed according to the change in the third period T3. You may. In that case, for example, under the condition (1), if the temperature outside the machine is less than 10 ° C., the third period T3 is maintained at 180s, so that the target speed maintenance period Tb may also be maintained at 305s. Further, if the temperature outside the machine is 10 ° C. to 20 ° C., the third period T3 is set to 200 s, so that the target speed maintenance period Tb may be changed to, for example, 325 s. Further, since the third period T3 is set to 220 s if the temperature outside the machine is 20 ° C. or higher, the target speed maintenance period Tb may be changed to, for example, 345 s.

In the present embodiment, the washer / dryer 10 has, as temperature sensors, an air supply temperature sensor 51, an exhaust temperature sensor 52, a compressor temperature sensor 53, a condenser temperature sensor 54, an evaporator inlet temperature sensor 55, and an evaporator outlet. Each of the temperature sensor 56 and the outside temperature sensor 57 is provided, but one or a plurality of combinations thereof may be used. Even in that case, the same effect as described above can be obtained.

Although a plurality of embodiments of the present invention have been described above, 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 embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

In the drawing, 10 is a washer / dryer, 11 is an outer box, 12 is a water tank, 13 is a rotary tank, 14 is a rotary tank motor, 16 is an exhaust port, 17 is an air supply port, 18 is a drainage section, and 19 is a drain valve. 23 is a control device, 30 is a circulation air passage, 31 is an exhaust duct, 32 is a filter device, 321 is a filter, 33 is a connection duct, 34 is a heat exchange part, 35 is an air supply duct, 36 is a blower, and 40 is a heat pump. Unit, 41 is an evaporator, 42 is a condenser, 43 is a compressor, 44 is a decompression device, 45 is an accumulator, 51 is an air supply temperature sensor, 52 is an exhaust temperature sensor, 53 is a compressor temperature sensor, 54 is a condenser. Temperature sensor, 55 is an evaporator inlet temperature sensor, 56 is an evaporator outlet temperature sensor, 57 is an external temperature sensor, 61 is a motor speed detector, 62 is an unbalance detector, 63 is a weight detector, and 64 is a cloth material. A detection unit, 65 indicates a fan rotation speed detection unit.

Claims (5)

A water tank that can store water inside,
A rotary tank that is rotatably provided in the water tank and can store laundry inside.
A rotary tank motor that rotationally drives the rotary tank,
A circulation air passage provided outside the water tank and connecting the exhaust port and the air supply port of the water tank, and
A blower device provided in the middle of the circulation air passage to blow air into the water tank and the rotary tank, and
A hot air supply device that dehumidifies and heats the air that has entered the circulating air passage from the water tank and supplies warm air to the water tank.
A filter device provided in the middle of the circulating air passage and collecting lint contained in the air flowing through the circulating air passage, and a filter device.
A drainage route for draining the water in the aquarium to the outside,
A drain valve that opens and closes the drainage path,
A control device that controls the drive of the rotary tank motor, the blower, the hot air supply device, and the drain valve, and
With
The control device can execute a preheat dehydration step of driving the hot air supply device to supply warm air into the rotary tank, increasing the rotation speed of the rotary tank to a target speed, and performing centrifugal dehydration.
The preheat dehydration step is
The first period, which is the period before the rotation speed of the rotary tank reaches the target speed, and which drives the blower at the initial rotation speed and keeps the drain valve open.
The period after the first period and the period before the rotation speed of the rotary tank reaches the target speed is maintained in a state where the rotation speed of the blower device is lower than the initial rotation speed. And the second period to keep the drain valve open, and
In the period after the second period, the rotation speed of the rotary tank is maintained at the target speed, and the rotation speed of the blower is maintained at a state lower than the initial rotation speed, and the rotation speed is maintained. The third period to keep the drain valve open and
In the period after the third period, the rotation speed of the rotary tank is maintained at the target speed, and the rotation speed of the blower is maintained in a state of being increased from the initial rotation speed, and the rotation speed is maintained. The fourth period to keep the drain valve closed and
Including,
Washing and drying machine. Further provided with an unbalance detection unit for detecting the unbalance of rotation of the rotary tank,
The control device is
The unbalance is detected by the unbalance detection unit before the rotation speed of the rotary tank reaches the target speed.
The larger the imbalance detected by the unbalance detection unit, the smaller the target speed and the longer the third period.
The washer / dryer according to claim 1. Further provided with a weight detector for detecting the weight of the laundry housed in the rotary tub,
The control device is
The heavier the weight of the laundry detected by the weight detector, the longer the third period.
The washer / dryer according to claim 1 or 2. Further equipped with a cloth quality detection unit for detecting the cloth quality of the laundry housed in the rotary tub,
The control device is
Preheat dehydration step that is executed before the preheat dehydration step, keeps the drain valve open without driving the blower, and drives the rotary tank at a rotation speed equal to or less than the target rotation speed to perform centrifugal dehydration. Is more feasible,
The number of steps, which is the number of starts and stops of the rotary tub motor in the preliminary dehydration step, is set according to the cloth quality of the laundry detected by the cloth quality detection unit.
When the cloth quality of the laundry detected by the cloth quality detection unit is mainly composed of chemical fibers, the number of steps in the preliminary dehydration step is reduced as compared with the case where the cloth quality is mainly composed of cotton. To lengthen the third period,
The washer / dryer according to any one of claims 1 to 3. Further equipped with a temperature sensor that directly or indirectly measures the temperature inside the water tank,
The control device is
The higher the temperature detected by the temperature sensor, the shorter the third period.
The washer / dryer according to any one of claims 1 to 4.

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