JP2012075818A - Washing machine - Google Patents

Abstract

An object of the present invention is to prevent a decrease in electrical insulation of an electrical component such as a drying heater in a circulation air passage when washing using warm water.
A washing machine according to an embodiment performs washing using hot water in a water tank. A circulation air passage having an inlet and an outlet connected to the water tank, and the water tank provided in the circulation air passage. A blower that circulates the air in the circulation air passage, a drying heater that is provided in the circulation air passage and heats the air in the circulation air passage, and a control means that controls the blower and the drying heater. . The control means generates heat by energizing the drying heater when hot water is used.
[Selection] Figure 1

Description

  Embodiments described herein relate generally to a washing machine.

  2. Description of the Related Art Conventionally, washing machines such as drum-type washing machines are known that can be washed using warm water and can be washed to dried. In this apparatus, a heater for hot water provided at the bottom of a water tank that accommodates the rotating drum, a circulation air passage whose inlet and outlet are connected to the water tank, and a dehumidifier (heat) provided in the circulation air passage. Exchanger), a blower, and a heater for drying, and the water in the water tank is heated by the heater for warm water to make warm water, washing is performed using the warm water, and warm air heated by the heater for drying is used. Is supplied into the water tank to heat the laundry, and drying is performed by repeatedly dehumidifying the moisture taken away from the laundry in a dehumidifier. The washing effect can be improved by washing with warm water.

Japanese Patent Laid-Open No. 10-272278

  However, in the conventional configuration, when washing is performed using hot water, the water vapor generated in the water tank also enters the circulation air passage and the humidity in the circulation air passage rises. Condensation is likely to occur. In particular, if dew condensation is repeated over a long period of time on electrical components such as a drying heater in the circulation air passage, the electrical insulation of the electrical components is significantly reduced, and insulation failure may occur.

  In view of the above, a washing machine capable of preventing a decrease in electrical insulation properties of electrical components such as a drying heater in a circulation air passage is provided for washing using hot water.

  In the washing machine of this embodiment, washing is performed using hot water in a water tank, and a circulation air passage having an inlet and an outlet connected to the water tank, and air in the water tank provided in the circulation air passage. A blower that circulates through the circulation air passage, a drying heater that is provided in the circulation air passage and heats the air in the circulation air passage, and a control unit that controls the blower and the drying heater. The control means generates heat by energizing the drying heater when hot water is used.

The figure which shows 1st Embodiment and shows the time chart of the change of the water temperature at the time of use of warm water, and the heater for warm water and the heater for drying External perspective view of the drum-type washing and drying machine shown with the door open Schematic perspective view of the water tank and the circulation air passage shown with the outer box removed, as seen from the upper right rear Plan view of dry air generation unit Block diagram showing electrical configuration PTC heater resistance-temperature characteristics The figure which shows 3rd Embodiment and shows the example of electricity supply when both the heater for warm water and the heater for drying are energized The figure for demonstrating 4th Embodiment and showing the relationship between temperature and saturated water vapor pressure Flow chart showing threshold setting processing

Hereinafter, washing machines (washing and drying machines) according to a plurality of embodiments will be described with reference to the drawings. In addition, in each embodiment, the same code | symbol is attached | subjected to the substantially same component, and description is abbreviate | omitted.
(First embodiment)
A first embodiment will be described with reference to FIGS. In FIG. 2 showing the overall appearance of the drum type washing machine (drum type washing and drying machine), the outer box 1 has a substantially rectangular box shape, and a base plate 2 is provided at the bottom. The front portion 1a of the outer box 1 has a downwardly inclined shape, and a laundry doorway 3 including a circular opening is formed at a substantially central portion thereof. A door 4 is provided on the front surface portion 1 a so as to be able to turn in the horizontal direction via a hinge 5, and the laundry entrance 3 is opened and closed by the door 4. On the front face 1a, an operation panel 6 is provided above the laundry entrance 3 and a drawer-type detergent charging case 7 is provided at the upper left.

  As shown in FIG. 3, a substantially cylindrical water tank 8 having a closed rear surface is disposed in the outer box 1. The water tank 8 is elastically supported on the base plate 2 via an elastic support mechanism 9 in a state where the axial direction is a horizontal axis in the front-rear direction and is inclined slightly downward. The opening on the front surface of the water tub 8 communicates with the laundry entrance 3. Although not shown in detail, the water tank 8 has a blowing port 10 on the front upper surface 8a and a blowing port 11 on the upper portion of the rear back surface 8b.

  In the water tank 8, a drum 14 (see FIG. 2), which is a rotating tank, is rotatably disposed. Although not shown in detail, the drum 14 has a cylindrical shape with the rear surface closed as in the case of the water tank 8, and its axial direction is a horizontal axis in the front-rear direction and is slightly inclined in the rearward downward direction. The water tank 8 is disposed. A plurality of holes 15 through which water and air can be passed are formed in the peripheral wall portion of the drum 14. A plurality of baffles 16 (only one is shown in FIG. 2) are provided inside the peripheral wall portion of the drum 14. The front opening of the drum 14 is also communicated with the laundry entrance / exit 3, and the drum 14 accommodates the laundry (not shown) put in from the laundry entrance / exit 3.

  The drum 14 is rotationally driven by a motor 17 provided on the back surface 8b of the water tank 8 as a driving means. The drum 14 having such a configuration functions as a washing tub during washing, as a dehydrating tub during dehydration, and as a drying tub during drying. The motor 17 is composed of, for example, an outer rotor type DC brushless motor. A warm water heater 18 (see FIG. 5) is provided at the bottom of the water tank 8. The warm water heater 18 is composed of, for example, a sheathed heater, and is energized to heat the water in the water tank 8 when a course for washing laundry with warm water is performed.

  A circulation air passage 20 for drying is provided outside the water tank 8. The circulation air passage 20 has an inlet and an outlet. The inlet is connected to the outlet 10 of the water tank 8, and the outlet is connected to the inlet 11 of the water tank 8. 3 indicates the direction in which the dry air flows through the circulation air passage 20 during the drying operation, and the configuration of the circulation air passage 20 will be described along the flow.

  First, an exhaust duct 21 is provided in the upper part of the front portion of the water tank 8. One end of the exhaust duct 21 is connected to the outlet 10 of the water tank 8, and one end of the exhaust duct 21 constitutes the inlet of the circulation air passage 20. A filter duct 22 is connected to the other end on the rear side of the exhaust duct 21. The filter duct 22 includes a rectangular container-shaped filter case 22a having an open upper surface and a duct portion 22b extending rearward from the filter case 22a. The other end of the duct 21 is connected. A lint filter unit 23 (see FIG. 2) having a lint filter (not shown) is detachably mounted on the filter case 22a through the upper surface opening.

  A hanging duct 24 provided in a suspended state at the back of the water tank 8 is connected to the rear end of the duct portion 22b. A heat exchange duct 25 that extends upward is connected to the lower end of the hanging duct 24 so as to be folded upward. The heat exchange duct 25 is provided with a water sprinkling portion 26. One end of the sprinkler 26 is connected to a water supply valve 27 (see FIG. 5). In this case, the drying air flowing through the heat exchange duct 25 in the direction indicated by the dotted arrow is poured from the sprinkling unit 26, whereby the drying air is cooled and moisture contained in the drying air is condensed and dehumidified. The heat exchange duct 25 functions as a water-cooled dehumidification type heat exchanger (dehumidifier). A drain pipe 28 is provided at the lower end of the heat exchange duct 25, and a drain hose (not shown) is connected to the drain pipe 28.

  A dry air generating unit 30 is provided on the upper surface of the water tank 8. As shown in FIG. 4, the dry air generating unit 30 includes a blower 31 and a heating device 32. Among these, the air blower 31 includes a fan casing 33, a fan (not shown) provided in the fan casing 33, and a fan motor 34 that rotates the fan. An air inlet of the fan casing 33 is connected to the upper end of the heat exchange duct 25. The heating device 32 includes a heater case 35 and a drying heater 36 disposed in the heater case 35, and the inlet of the heater case 35 is connected to the discharge port of the fan casing 33. The outlet of the heater case 35 is connected to the suction port 11 via an air supply duct 37 and a cover member 38 provided on the back surface 8 b of the water tank 8. The cover member 38 is connected to the suction port 11 of the water tank 8 and constitutes the outlet of the circulation air passage 20. In this case, the drying heater 36 is composed of a PTC heater.

  The circulation air passage 20 is provided with a plurality of temperature sensors. Specifically, a heat exchanger inlet temperature sensor 40 is provided in the lower part of the heat exchange duct 25, and a heat exchanger outlet temperature sensor 41 is provided in the upper part of the heat exchange duct 25 to generate hot air. A warm air outlet temperature sensor 42 is provided in the vicinity of the outlet of the heater case 35 serving as the outlet of the unit 30. A water temperature sensor 43 for detecting the water temperature in the water tank 8 is provided at the bottom of the water tank 8. Further, in the outer box 1, an outside air temperature sensor 44 is provided near the upper portion of the base plate 2. In this case, the heat exchanger inlet temperature sensor 40, the heat exchanger outlet temperature sensor 41, the warm air outlet temperature sensor 42, the water temperature sensor 43, and the outside air temperature sensor 44 are constituted by a thermistor. A water level sensor 45 (see FIG. 5) for detecting the water level in the water tank 8 is also provided.

  As shown in FIG. 2, the operation panel 6 is provided with various operation units 48 in addition to a power-on switch 46 a, a power-off switch 46 b, and a display unit 47. The operation unit 48 constitutes a course setting means for setting a course including a course for washing laundry with warm water. On the back side of the operation panel 6, a control device 50 (see FIG. 5) constituting control means is provided. The control device 50 is mainly composed of a microcomputer, for example, and controls the entire washing machine.

  FIG. 5 shows a block diagram of a schematic electrical configuration centering on the control device 50 in the washing machine of the present embodiment. The control device 50 includes a power-on switch 46a, a power-off switch 46b, various operation units 48, a heat exchanger inlet temperature sensor 40, a heat exchanger outlet temperature sensor 41, a hot air outlet temperature sensor 42, and a water temperature sensor. 43, signals from the outside air temperature sensor 44, the water level sensor 45, and the like are input. Based on these signals and a control program prepared in advance, the control device 50 includes a display unit 47, a water supply valve 27, a drain valve 51 for discharging water in the water tank 8, a motor 17 for rotating the drum 14, and a blower 31. The fan motor 34, the drying heater 36, the warm water heater 18 and the like are controlled.

  Next, the operation of the above configuration will be described. It is assumed that the user operates the operation unit 48 in a state where the laundry (not shown) is accommodated in the drum 14 through the laundry entrance 3 and sets a course for washing using hot water, for example. As a course using warm water, for example, the temperature can be selected in three stages of 30 ° C., 60 ° C., and 90 ° C. The course using warm water can be expected to improve the cleaning effect. In particular, the 90 ° C course can be expected to be sterilized. Here, for example, it is assumed that a course using hot water having a water temperature of 60 ° C. is selected.

  When the user operates the operation unit 48 to start the washing operation, the control device 50 first detects the weight of the laundry stored in the drum 14. In this case, the laundry weight is detected based on the fact that the drum 14 is rotated by the motor 17 and the current flowing in the motor 17 at that time is detected by a current transformer (not shown). The control device 50 sets a detergent amount, a water level at the time of washing, and the like according to the detected laundry weight, and displays the detergent amount on the display unit 47. The user inputs the amount of detergent displayed on the display unit 47 into the detergent charging case 7. Thereafter, the control device 50 opens the water supply valve 27 to supply tap water connected to the water supply valve 27 into the water tank 8 through the detergent charging case 7. Along with this, the detergent introduced into the detergent introduction case 7 is also supplied into the water tank 8 together with water. The water level in the water tank 8 is detected by the water level sensor 45, and the detection signal is also output to the control device 50.

  When determining that the water level in the water tank 8 has reached the set water level, the control device 50 closes the water supply valve 27 and stops water supply. Thereafter, as shown in FIG. 1, the control device 50 starts the stirring operation and energizes the warm water heater 18 to generate heat. In the stirring operation, the laundry is stirred by rotating the drum 14 forward and backward at a low speed (for example, 40 to 60 rpm) by the motor 17. As a result, the laundry is washed. Moreover, by energizing the warm water heater 18 to generate heat, the water in the water tank 8 is heated, and the temperature gradually rises to become warm water. Accordingly, the laundry in the drum 14 is washed using warm water. At the time of this hot water washing, since the circulation air passage 20 connected to the outside of the water tank 8 is also in communication with the water tank 8, the water vapor in the water tank 8 also enters the circulation air passage 20, and the circulation air passage The humidity within 20 also increases. The water temperature in the water tank 8 is detected by the water temperature sensor 43, and the detection signal (detection temperature) is also output to the control device 50.

  When the temperature detected by the water temperature sensor 43 reaches a preset threshold value, for example, 45 ° C., the control device 50 energizes the drying heater 36 to generate heat. As a result, the temperature of the drying heater 36 and the vicinity of the drying heater 36 increases, and the occurrence of condensation can be prevented. When the temperature detected by the water temperature sensor 43 reaches the set temperature of hot water, in this case 60 ° C., the control device 50 cuts off the hot water heater 18 while the drying heater 36 is still energized. The control device 50 continues the stirring operation with warm water, and when a predetermined stirring time has elapsed, stops the rotation of the drum 14 to end the stirring operation and disconnects the heater 36 for drying. Thereafter, the control device 50 performs a draining operation of opening the drain valve 51 and discharging the water (hot water) in the water tank 8 to the outside of the apparatus. Thus, the warm water washing process is completed.

  Even when the user selects a course using hot water having a water temperature of 90 ° C. and the control device 50 executes the course, the control device 50 detects that the temperature detected by the water temperature sensor 43 is 45 ° C., which is the threshold value. Is exceeded, the drying heater 36 is energized to generate heat, thereby preventing condensation. In addition, when the user selects a course using hot water having a water temperature of 30 ° C. and the control device 50 executes this, the temperature detected by the water temperature sensor 43 does not exceed the threshold value of 45 ° C. The control device 50 does not energize the drying heater 36 on the assumption that no condensation occurs in the circulation air passage 20.

  When this warm water washing process is completed, the controller 50 performs the intermediate dehydration, the rinsing process, and the final dehydration to complete the washing operation. In the intermediate dehydration, the laundry is centrifugally dehydrated by rotating the drum 14 in one direction at a high speed (for example, 1300 rpm). In the rinsing process, rinsing is performed by supplying tap water into the water tank 8 and rotating the drum 14 forward and backward at a low speed. In the final dehydration, the laundry is centrifugally dehydrated by rotating the drum 14 at a high speed (for example, 1300 rpm) in one direction as in the intermediate dehydration. Thus, the washing operation of the course using hot water is completed.

  In addition, when performing to drying operation, the control apparatus 50 drives the air blower 31 and the heating apparatus 32 in the dry wind generation | occurrence | production unit 30, rotating the drum 14 forward / reversely at a low speed to loosen the laundry. Specifically, the fan is rotated by a fan motor 34 in the blower 31 and the drying heater 36 of the heating device 32 is energized to generate heat. As a result, the air heated by the drying heater 36 is supplied as drying air from the blowing port 11 into the water tank 8 and eventually into the drum 14 by the blowing action of the blower 31. The drying air supplied into the drum 14 heats the laundry and removes moisture from the laundry, and is discharged from the outlet 10 to the exhaust duct 21 side of the circulation air passage 20. The dry air discharged to the exhaust duct 21 side passes through the filter duct 22, the drooping duct 24, and the heat exchange duct 25 in order, and flows so as to be sucked into the fan casing 33 of the blower 31 (see the dotted line arrow in FIG. 3).

  At this time, the lint contained in the dry air is captured and removed by the lint filter as the dry air passes through the filter duct 22. Further, when the drying air passes through the heat exchange duct 25, the drying air is cooled by water injection from the water sprinkling unit 26, and moisture contained in the drying air is removed. The drying air from which the moisture has been removed passes through the fan casing 33 and the heater case 35 and is heated again by the drying heater 36, and the heated drying air is repeatedly supplied into the water tank 8. Thereby, the laundry in the drum 14 is dried.

According to the first embodiment described above, the following operational effects can be obtained.
The control device 50 is configured to generate heat by energizing the drying heater 36 in the circulation air passage 20 when washing with warm water using warm water. As a result, even if water vapor generated in the water tank 8 due to hot water washing enters the circulation air passage 20 and the humidity in the circulation air passage 20 rises, the drying heater 36 which is an electrical component and its surroundings It is possible to prevent the occurrence of dew condensation, and it is possible to prevent the electrical insulation of the drying heater 36 from being lowered and causing an insulation failure.

  A water temperature sensor 43 for detecting the temperature of the water in the water tank 8 is provided, and when the control device 50 determines that the detected temperature of the water temperature sensor 43 has exceeded a threshold value of 45 ° C. in this case, a heater for drying. 36 was energized to generate heat. Accordingly, when the drying heater 36 needs to be energized (when condensation is likely to occur), the drying heater 36 is energized to prevent condensation from occurring in the drying heater 36 and its surroundings. In other cases, it is possible to suppress wasteful power consumption by cutting off the drying heater 36.

  A PTC heater is used as the drying heater 36. As shown in FIG. 6, the PTC heater has a characteristic that resistance increases and operating current decreases as the temperature rises. During the stroke where condensation may occur, the PTC heater maintains the energized state constantly to prevent condensation. Can be prevented. Further, due to the same characteristics, there is an advantage that fine on-off control is unnecessary during the heat generation of the PTC heater, and control is easy.

(Second Embodiment)
A second embodiment will be described. In the second embodiment, the condition for energizing the drying heater 36 is different from that in the first embodiment in order to prevent the occurrence of condensation in the circulation air passage 20 when performing a washing operation using hot water. Yes. That is, in the course using the hot water set by the operation unit 48, the control device 50 has a set temperature of 60 ° C. and 90 ° C. at which condensation is likely to occur in the circulation air passage 20. When the course is selected, the drying heater 36 is energized to generate heat, and when the set temperature is 30 ° C., which is a temperature at which the possibility that condensation occurs in the circulation air passage 20 is low. The drying heater 36 is not energized. In this case, the timing of starting energization of the drying heater 36 may be energized simultaneously with the start of the stirring operation, may be energized after a lapse of a predetermined time from the start of the stirring operation, or the water temperature may be The power may be supplied when the threshold value of 45 ° C. is exceeded.
In such a second embodiment, the same operational effects as those of the first embodiment can be obtained.

(Third embodiment)
A third embodiment will be described with reference to FIG. When executing a course using warm water, the control device 50 controls to energize alternately while avoiding simultaneous energization when energizing both the warm water heater 18 and the drying heater 36.
Thereby, it is possible to prevent condensation from occurring in the drying heater 36 and the vicinity thereof in the circulation air passage 20 while preventing the power consumption from being concentrated and increased at a time.

(Fourth embodiment)
A fourth embodiment will be described with reference to FIGS. FIG. 8 shows the relationship between temperature and saturated water vapor pressure. The vertical axis in FIG. 8 represents the saturated water vapor pressure, which can be read as the saturated water vapor amount. However, numerical values and units are different. As can be seen from FIG. 8, the amount of moisture that can be contained in the air varies depending on the temperature, and therefore, even if the water temperature in the water tank 8 is the same, it is generated depending on the temperature of the contacting component (for example, the drying heater 36). The amount of water is different. In a washing machine, the outside air temperature and the temperature of parts in the washing machine (for example, the drying heater 36) are considered to be the same unless they are in continuous use. For this reason, the lower the outside air temperature, the higher the risk of condensation on the component (drying heater 36) when using hot water.

  In this embodiment, when washing is performed using hot water, if the outside air temperature is a predetermined temperature, for example, 30 ° C. or higher, the threshold value for energizing the drying heater 36 is set to 45 ° C., and the outside air temperature is set. When the temperature is less than 30 ° C., the threshold value is lowered.

  For example, when the outside air temperature is 30 ° C. and the temperature of the water in the water tank 8 is 45 ° C., when controlling the energization of the drying heater 36, assuming that the humidity in the water tank 8 is 100%, The amount of moisture that is expected to condense in a part having a temperature of 30 ° C. is A1 in FIG. On the other hand, when the outside air temperature is low, for example, around 0 ° C., when the drying heater 36 is energized when the water temperature in the water tank 8 reaches 45 ° C., the temperature is about 0 ° C. The amount of water expected to condense is B1 in FIG. 8, which is much larger than A1 (B1> A1). In order to make the amount of moisture B2 that is expected to condense in parts having a temperature near 0 ° C. to be substantially the same as A1, the temperature at which the heater 36 is energized is around 40 ° C.

  Therefore, in this embodiment, when the outside air temperature (the temperature detected by the outside air temperature sensor 44) is 30 ° C. or higher, the threshold value for energizing the drying heater 36 is 45 ° C., and the outside air temperature is less than 0 ° C. In some cases, the threshold value is changed to 40 ° C., and the threshold value is between 40 ° C. and 45 ° C. when the outside air temperature is in the range of 0 ° C. to 30 ° C. , Change it to be proportional to the outside temperature.

  FIG. 9 shows a threshold value setting process for energizing the drying heater 36 performed by the control device 50. This threshold value setting process will be described. First, the control device 50 determines whether or not the detected temperature (outside air temperature) detected by the outside air temperature sensor 44 is 30 ° C. or higher (step S11). If it is 30 ° C. or higher, step S12 is performed according to “YES”. , The threshold value for energizing the drying heater 36 is set to 45 ° C., and the process returns to the main routine. When the detected temperature (outside air temperature) detected by the outside air temperature sensor 44 is less than 30 ° C., the process proceeds to step S13 according to “NO” in step S11, and whether or not the detected outside air temperature is less than 0 ° C. is determined. If it is determined that the temperature is less than 0 ° C., the process proceeds to step S 14 according to “YES”, the threshold value for energizing the drying heater 36 is set to 40 ° C., and the process returns to the main routine.

  When the detected temperature (outside air temperature) detected by the outside air temperature sensor 44 is in the range of 0 ° C. to 30 ° C. (0 ° C. or higher and lower than 30 ° C.), the process proceeds to step S15 and the drying heater 36 is energized. The threshold value is set between 40 ° C. and 45 ° C. to be proportional to the outside air temperature, and then the process returns to the main routine.

  According to such an embodiment, the threshold value for energizing the drying heater 36 is changed in accordance with the outside air temperature. Therefore, even when the outside air temperature is low, condensation occurs on the drying heater 36 and its surroundings. Occurrence can be more effectively prevented.

(Other embodiments)
When washing is performed using hot water, a plurality of temperature sensors (heat exchanger inlet temperature sensor 40, heat exchanger outlet temperature sensor 41, hot air outlet temperature sensor 42) in the circulation air passage 20, It is also possible to control the energization of the drying heater 36 based on the information on the detected temperatures of the water temperature sensor 43 and the outside air temperature sensor 44. For example, in the case of washing using hot water, even if the outside air temperature sensor 44 is at a low detection temperature in a state before water supply, other heat exchanger inlet temperature sensors 40 and heat exchanger outlets are used. When the temperature sensor 41, the temperature sensor 42 for the hot air outlet, and the temperature detected by the water temperature sensor 43 are relatively high, a washing operation using hot water may be performed continuously, or a drying operation may be performed immediately before. If it can be determined that the drying heater 36 and its surroundings are warm and the possibility of condensation is low, the timing of energization of the drying heater 36 and the threshold for energization should be changed. Is possible.

The present invention is not limited to a drum-type washing machine (drum-type washing / drying machine) whose axis of the water tank 8 is a horizontal axis, but can also be applied to a vertical-type washing machine (washing / drying machine) in which the axis of the water tank is oriented vertically.
The heater 18 for hot water is not necessarily required. For example, the hot water of the remaining hot water in the bath is supplied into the water tank 8 by a water supply pump or the like, or hot water heated by a water heater or the like is supplied into the water tank 8. It can also be applied to those washing with warm water.

  In the drawings, 1 is an outer box, 8 is a water tank, 14 is a drum, 18 is a heater for hot water, 20 is a circulation air passage, 21 is an exhaust duct (inlet), 30 is a dry air generating unit, 31 is a blower, and 32 is heating. Device, 36 is a drying heater, 38 is a cover member (exit), 43 is a water temperature sensor, 44 is an outside air temperature sensor, 48 is an operation unit (course setting means), and 50 is a control device (control means).

Claims (5)

In a washing machine that performs washing using hot water in the aquarium,
A circulation air passage whose inlet and outlet are connected to the water tank;
A blower provided in the circulation air passage to circulate the air in the water tank through the circulation air passage;
A drying heater provided in the circulation air passage for heating air in the circulation air passage;
Control means for controlling the blower and the drying heater,
The washing machine according to claim 1, wherein the control means generates heat by energizing the drying heater when hot water is used. It has a water temperature sensor that detects the temperature of hot water,
2. The washing machine according to claim 1, wherein, when it is determined that the temperature detected by the water temperature sensor exceeds a threshold value, the control unit energizes the drying heater to generate heat. A course setting means for setting a course including a course using hot water is provided.
2. The washing machine according to claim 1, wherein when the course that uses hot water having a temperature equal to or higher than a predetermined temperature is set by the course setting unit, the control unit causes the drying heater to energize to generate heat. It has an outside air temperature sensor that detects outside air temperature,
The washing machine according to claim 2, wherein the control means lowers the threshold value for energizing the drying heater when the temperature detected by the outside air temperature sensor is lower than a predetermined temperature. A heater for hot water for heating the water in the water tank,
The washing machine according to any one of claims 1 to 4, wherein when the hot water heater and the drying heater are energized, the control means avoids simultaneous energization and energizes alternately. .

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