JP2016097249A - Clothes dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clothes dryer which does not inhibit a flow of air in a circulation air passage even when heating means is provided in the circulation air passage for preventing frost formation in an evaporator, and which can suppress performance degradation of clothes drying.SOLUTION: A clothes dryer includes: a drying chamber 12 having an exhaust port 16 and an air supply port 17; a circulation air passage 30 provided outside the drying chamber 12 and for connecting the exhaust port 16 and the air supply port 17; a blower 41 for circulating air in the drying chamber 12 through the circulation air passage 30; a heat pump 40 including a condenser 37 for heating air in the circulation air passage 30 and an evaporator 36 for cooling and dehumidifying the air in the circulation air passage 30; a heating device 80 for heating the air between the exhaust port 16 and the evaporator 36 in the circulation air passage 30; an outside air temperature sensor 57 for detecting temperature of an installation atmosphere; and a control device 23 for controlling the heating device 80. The heating device 80 includes: a heat generation coating film 82 for coating a surface facing the circulation air passage 30 between the exhaust port 16 and the evaporator 36; and a power supply part 84 for applying a voltage to the heat generation coating film 82.SELECTED DRAWING: Figure 3

Description

  The present embodiment relates to a clothes dryer.

  2. Description of the Related Art Conventionally, clothes dryers equipped with a heat pump for drying clothes such as laundry have attracted attention because they have better drying efficiency and energy saving effects than those equipped with heaters for heating.

  In a clothes dryer equipped with a heat pump, a circulation air passage communicating with a drying chamber containing clothes is provided, and a blower for circulating the air in the drying chamber through the circulation air passage and the evaporation of the heat pump are provided in the circulation air passage. A condenser and a condenser are provided.

  The heat pump includes a compressor that compresses and discharges the refrigerant, a condenser that dissipates and liquefies the high-temperature and high-pressure gas refrigerant discharged from the compressor, a decompression device that decompresses the refrigerant that has passed through the condenser, An evaporator that vaporizes the liquefied refrigerant is sequentially connected by piping, and the refrigerant is circulated by driving the compressor.

  Then, the air in the circulation air passage heated by the heat released from the condenser is sent into the drying chamber, and the air deprived of moisture from the clothing is dehumidified by cooling in the evaporator in the circulation air passage. The clothes are dried by repeatedly heating the air again with a condenser and supplying the air to the drying chamber.

  By the way, in the clothes dryer as described above, when the temperature of the installation atmosphere is low as in winter, the temperature of the air flowing in the circulation air passage is low immediately after the start of the heat pump operation. So-called frost formation may occur in which the water condensed at the temperature of 0 ° C. or lower freezes. When frost forms on the evaporator, the frost becomes resistance of the air passing through the evaporator and the amount of air flowing through the circulation air passage is reduced. In some cases, the frosting of the evaporator proceeds and the drying performance is further deteriorated.

  On the other hand, in Patent Document 1 below, when the means for detecting the temperature of the installation atmosphere detects a temperature below a predetermined value, the heating means is energized to increase the temperature of the air to be circulated into the drying chamber. It is proposed to prevent frosting of the evaporator. However, since the heating means is composed of a heating element such as a heater disposed in the circulation air passage and obstructs the flow of air in the circulation air passage, there is a problem that the efficiency of drying clothes is reduced.

JP 2009-195363 A

  The present invention has been made in consideration of the above problems, and even if a heating means for preventing frosting of the evaporator is provided in the circulation air passage, the flow of air in the circulation air passage is not hindered, and clothing An object of the present invention is to provide a clothes dryer capable of suppressing a decrease in drying efficiency.

  The clothes dryer of the present embodiment includes a drying chamber having an exhaust port and an air supply port, a circulation air path provided outside the drying chamber and connecting the exhaust port and the air supply port, and the drying through the circulation air channel. A blower that circulates air in the room, a condenser that heats the air in the circulation air passage, an evaporator that cools and dehumidifies the air in the circulation air passage, and compresses and supplies the refrigerant to the condenser A heat pump provided with a compressor and a pressure reducing device for reducing the pressure of the refrigerant that has passed through the condenser; heating means for heating air between the exhaust port and the evaporator in the circulation air passage; and an installation atmosphere. An outside air temperature sensor that detects the temperature of the heat pump, and a control device that heats the heating means when the temperature of the installation atmosphere detected by the outside air temperature sensor when the heat pump is started is lower than a predetermined temperature. The exhaust port and the steam Comprising a heating coating covering the surface facing the air circulation path between the vessels, and a power supply unit for applying a voltage to the exothermic coating.

It is a vertical side view partially broken and shown about a schematic structure of a clothes dryer concerning a first embodiment. It is a vertical rear view which is partially broken and shown about a schematic structure of the clothes dryer. It is a figure which shows schematic structure of the refrigerating cycle by a heat pump unit. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a block diagram which shows the control structure of the clothes dryer. It is a figure which shows each temperature when the starting of a refrigerating cycle is abnormal. It is a figure which shows each temperature when the starting of a refrigerating cycle is normal. It is a flowchart which shows the control content of the drying operation by a control apparatus. It is a table showing the applied voltage of a heating apparatus in 2nd Embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

  The clothes dryer of the present embodiment relates to a washing and drying machine that serves as both a washing machine and a clothes drying machine as shown in FIGS. 1 and 2, and includes an outer box 11, a water tank 12, a rotating drum 13, and a motor 14. , And a door 15. In the present embodiment, the door 15 side with respect to the outer box 11 is the front side of the washing / drying machine 10.

  The washing / drying machine 10 is a so-called drum-type washing / drying machine having a heat pump-type drying function, in which the rotation axis of the rotary drum 13 is inclined upward with respect to a horizontal plane. A laundry doorway 112 having a circular opening is formed on the front surface portion 11 a of the outer box 11 and is opened and closed by the door 15.

  A substantially cylindrical water tank 12 having a front surface opened and a rear surface closed is disposed in the outer box 11. The water tank 12 is connected to the laundry entrance / exit 112 through the elastic support mechanism in a state where the axial direction of the water tank 12 is a horizontal axis in the front-rear direction and slightly inclined rearward so that the front opening 121 communicates with the laundry entrance 112. It is supported on the base plate 11 b of the outer box 11.

  The water tank 12 is supplied with water such as tap water from the outside of the apparatus via a water supply hose 28 from a water supply opening provided at the upper part of the water tank 12 via a water supply valve 27, and a drain opening provided at the bottom lower end of the water tank 12. It is comprised so that the water in the water tank 12 can be drained out of the machine through the drain valve 19 and the drain hose 20 from 123. Further, the water tank 12 is provided with an exhaust port 16 on the upper surface of the front part and an air supply port 17 on the upper part of the rear surface in addition to the front opening 121, the water supply port and the drain port 123.

  A cylindrical rotating drum 13 having a front surface opened and a rear surface closed is rotatably disposed in the water tank 12. The rotary drum 13 is disposed in the water tank 12 in a state where the axial direction is a horizontal axis in the front-rear direction and is slightly inclined downward. A number of holes 21 through which water and air can be passed are formed in the peripheral wall of the rotating drum 13, and the inside of the rotating drum 13 communicates with the water tank 12 through the holes 21. The front opening 131 of the rotary drum 13 is also communicated with the laundry entrance 112, and the rotary drum 13 accommodates the laundry put in from the laundry entrance 112. The rotary drum 13 is rotationally driven by a motor 14 provided on the back surface of the water tank 12.

  The rotating drum 13 having such a configuration functions as a washing tub during the washing stroke, as a dehydrating tub during the dehydration stroke, and as a drying tub (drying chamber) during the drying operation.

  As shown in FIGS. 2 and 3, the exhaust port 16 and the air supply port 17 provided in the water tank 12 include an exhaust duct 31, a filter device 32, a connection duct 33, a heat exchange duct 34, and an air supply duct 35. A circulation air passage 30 configured is connected in communication, and air in the water tank 12 and the rotary drum 13 (drying chamber) can be circulated through the circulation air passage 30.

  As shown in FIG. 1, the exhaust duct 31 is configured by, for example, a bellows-like hose, and connects the exhaust port 16 of the water tank 12 and the filter device 32. The filter device 32 is provided inside the outer box 11 and above the water tank 12 and the rotating drum 13. The filter device 32 removes foreign matters such as lint contained in the air exhausted from the exhaust port 16 by the filter 321 provided therein, and supplies the air from which the foreign matters have been removed to the connection duct 33.

  The connection duct 33 is a duct extending in the vertical direction that connects the filter device 32 disposed at the upper part inside the outer box 11 and the heat exchange duct 34 disposed at the lower part inside the outer box 11. At the lower end of the connection duct 33, that is, at the connection portion with the heat exchange duct 34, a compressor cover 42 protruding above the base plate 11 b protrudes into the duct. The compressor cover 42 divides a space for housing the compressor 38 between the base plate 11b.

  As shown in FIGS. 2 to 5, on the surface of the compressor cover 42 facing the heat exchange duct 34, a wind direction plate that guides the air blown out from the connection duct 33 toward the compressor cover 42 to the heat exchange duct 34. 42a is provided.

  The heat exchange duct 34 is placed on the base plate 11 b located below the water tank 12, and is a duct extending in the horizontal direction from the lower end portion of the connection duct 33. Inside the heat exchange duct 34, the air in the water tank 12 is circulated through the evaporator 36, the condenser 37 disposed away from the evaporator 36 to the downstream side of the heat exchange duct 34, and the circulation air passage 30. A blower 41 to be supplied is disposed.

  As shown in FIG. 4, the evaporator 36 and the condenser 37 have a large number of refrigerant pipes 36a and 37a formed in a meandering shape made of a material having high thermal conductivity such as copper, and a plurality of refrigerant pipes 36a and 37a at a predetermined pitch. It is a fin tube type heat exchanger having fins 36b and 37b mounted side by side, and air flowing through the circulation air passage 30 is interposed between the fins 36b and 37b of the evaporator 36 and the condenser 37 in the heat exchange duct 34. Circulate.

  As shown in FIG. 3, the evaporator 36 and the condenser 37 are a heat pump together with a compressor 38 that compresses the refrigerant supplied to the condenser 37, and a decompressor 39 that includes a capillary tube that decompresses the refrigerant discharged from the condenser 37. 40 is configured.

  In the heat pump 40, a compressor 38, a condenser 37, a decompression device 39, and an evaporator 36 are connected in this order via a connection pipe to constitute a refrigeration cycle, and refrigerant is circulated by the operation of the compressor 38. The evaporator 36 cools and dehumidifies the air flowing through the heat exchange duct 34, and the condenser 37 heats the air dehumidified by the evaporator 36. The compressor 38 and the pressure reducing device 39 are disposed outside the heat exchange duct 34.

Although not shown in detail, the compressor 38 includes a compression mechanism unit and a motor unit, and is configured such that the drive rotational speed of the compressor 38 can be changed by inverter control of the control device 23. The control device 23 changes the supply pressure of the refrigerant discharged from the compressor 38 by changing the drive rotational speed of the compressor 38, thereby changing the heating capacity of the condenser 37 and the cooling capacity of the evaporator 36. Let
In this example, the decompression device 39 is composed of a capillary tube, and decompresses the high-pressure liquid refrigerant discharged from the condenser 37 into a low-pressure gas-liquid mixed state. In this embodiment, a capillary tube is used as the decompression device 39, but a flow rate control valve may be used instead of the capillary tube.

  The downstream side of the heat exchange duct 34 is connected to the air supply port 17 of the water tank 12 via the air supply duct 35, and a blower 41 is provided at a connection portion between the heat exchange duct 34 and the air supply duct 35. . The blower 41 is configured by a sirocco fan, for example, and is configured such that the rotation speed can be changed by the control of the control device 23. The air blower 41 sucks the air in the heat exchange duct 34 and discharges it to the air supply duct 35 side, whereby the air flow circulating through the water tank 12 and the circulation air passage 30 as shown by arrows in FIGS. Occurs.

  The circulation air passage 30 is provided with a heating device 80 for heating the air between the exhaust port 16 and the evaporator 36. As shown in FIGS. 3 and 5, the heating device 80 covers the surface facing the inside of the circulation air passage 30 between the exhaust port 16 and the evaporator 36, in this example, the inner wall surface 33 a of the connection duct 33. A heat generation film 82 and a power supply unit 84 that applies a voltage to the heat generation film 82 are provided.

  The heat generation coating 82 is a coating made of a heating element such as Ni—Cr (nickel-chromium) alloy or Mo (molybdenum), for example, and covers the pair of application electrodes 84 a provided on the inner wall surface 33 a of the connection duct 33. Thus, the inner wall surface 33a of the connection duct 33 is covered.

  The pair of application electrodes 84 a is made of a conductive metal film that covers the inner wall surface 33 a of the connection duct 33 in a ring shape, and is provided at an interval in the axial direction of the connection duct 33. The pair of application electrodes 84a constitutes the power supply unit 84 together with the power supply generation unit 84b, and is connected to the power supply generation unit 84b through the lead wire 86 that passes through the wall surface of the connection duct 33 and is drawn to the outside of the circulation air passage 30. Has been. In the power supply generation unit 84b, the voltage applied to the heat generation coating 82 from the pair of application electrodes 84a is controlled by the control device 23, and thereby, the heat generation amount of the heating device 80 is controlled.

  Various sensors such as an air inlet temperature sensor 51 and an exhaust port temperature sensor 52 are disposed inside the circulation air passage 30.

  The air inlet temperature sensor 51 is provided between the condenser 37 and the air inlet 17 in the circulation air passage 30, and the air between the condenser 37 and the air inlet 17 in the circulation air passage 30. Detect the temperature. In this example, the air inlet temperature sensor 51 is provided in the air inlet duct 35 and in the vicinity of the air inlet 17. The air inlet temperature sensor 51 passes through the air supply duct 35 and is supplied into the water tank 12 and the rotary drum 13 which are drying chambers, that is, heated in the heat exchange duct 34 and supplied into the drying chamber. Detect air temperature.

  The exhaust port temperature sensor 52 is provided between the evaporator 36 and the exhaust port 16 in the circulation air passage 30, and the temperature of the air between the evaporator 36 and the exhaust port 16 in the circulation air passage 30. To detect. In this example, the exhaust port temperature sensor 52 is provided in the vicinity of the exhaust port 16 in the exhaust duct 31. The exhaust port temperature sensor 52 detects the temperature of the air that is exhausted from the water tank 12 and the rotary drum 13 that are drying chambers and passes through the exhaust duct 31.

  Further, the heat pump 40 includes a compressor discharge side temperature sensor 53 that detects the temperature of the refrigerant discharged from the compressor 38, a condenser temperature sensor 54 that detects the temperature of the condenser 37, and a refrigerant inlet of the evaporator 36. An evaporator inlet temperature sensor 55 for detecting the temperature in the vicinity and an evaporator outlet temperature sensor 56 for detecting the temperature in the vicinity of the refrigerant outlet of the evaporator 36 are provided. Inside the outer box 11 is provided an outside air temperature sensor 57 that detects the temperature (outside air temperature) of the installation atmosphere of the washing and drying machine.

  The washing / drying machine 10 according to the present embodiment is provided with a control device 23 that includes a microcomputer and a memory and controls the overall operation of the washing / drying machine. As shown in FIG. 6, the control device 23 includes an operation signal output from the operation panel 24 provided on the upper portion of the front surface portion 11 a of the outer box 11, an intake port temperature sensor 51, an exhaust port temperature sensor 52, a compression Various detection signals detected by the respective sensors such as the machine discharge side temperature sensor 53, the condenser temperature sensor 54, the evaporator inlet temperature sensor 55, the evaporator outlet temperature sensor 56, and the outside air temperature sensor 57 are input, and these various signals are input. The operation of the operation panel 24, the motor 14, the water supply valve 27, the drain valve 19, the blower 41, the compressor 38, and the heating device 80 is controlled based on the control program stored in the memory in advance.

  Next, an example of operation | movement of the washing dryer 10 of the said structure is demonstrated.

  First, a schematic operation of the washing / drying machine 10 will be described. When the user operates the operation button on the operation panel 24 to set the course of operation and instructs the start of the operation, the washing / drying machine performs the washing operation, the drying operation, or its operation according to the set operation course. A washing / drying operation is performed in which both operations are continued. As one of them, when the execution of the washing and drying operation is started, the washing process, the dehydrating process, and the drying process are executed in order.

  In the washing process, after supplying the washing water into the water tank 12 by opening the water supply valve 27, an operation of rotating the rotary drum 13 at a low speed is performed. In the dehydration process, after the drain valve 19 is opened and the water in the water tank 12 is discharged, the rotating drum 13 is rotated at a high speed.

  In the drying process, the control device 23 operates the motor 14, washes, and rotates the rotating drum 13 containing the wet clothes after rinsing in both forward and reverse directions at low speed, while the evaporator 36 and the heat exchanger duct 34 in the heat exchange duct 34. An operation of supplying the heated air dehumidified by the condenser 37 into the rotary drum 13 is performed.

  The operation of supplying the dehumidified heated air into the rotary drum 13 is performed by operating the heat pump 40 while driving the blower 41. When the temperature of the installation atmosphere of the washing / drying machine 10 is low, the compressor 38 is turned on. When started, as shown in FIG. 7, the evaporator inlet side temperature and the evaporator outlet side temperature rapidly decrease to cause frost formation in the evaporator 36. As a result, the supply air temperature sensor 51 detects the supply air. The temperature of the air supplied from the air vent 17 to the water tank 12 will not rise sufficiently.

  Therefore, when starting the operation of the compressor 38 and starting the heat pump 40, the control device 23 detects the temperature of the installation atmosphere of the washing and drying machine with the outside air temperature sensor 57, and the heating device according to the detected temperature. 80 is controlled.

  That is, as shown in FIG. 9, in the control device 23, the temperature Tr of the installation atmosphere of the washing / drying machine detected by the outside air temperature sensor 57 before the compressor 38 is started is equal to or lower than a predetermined temperature T1 (for example, 20 ° C.). Whether or not (step S1).

  If the detected temperature Tr of the outside air temperature sensor 57 is equal to or lower than the predetermined temperature T1, the control device 23 controls the power source generator 84b to apply a voltage from the pair of application electrodes 84a to the heat generating film 82 via the lead wires 86. The heat generation film 82 is applied to generate heat, the heating device 80 is operated (step S2), and then the compressor 38 is started (step S3). On the other hand, if the detected temperature Tr of the outside air temperature sensor 57 is higher than the predetermined temperature T1, the control device 23 assumes that there is no possibility of frost formation in the evaporator 36 after the start of the compressor 38, and does not operate the heating device 80. The compressor 38 is started (step S3).

  When the compressor 38 is started, the control device 23 detects the temperature near the refrigerant outlet of the evaporator 36 by the evaporator outlet temperature sensor 56, and if the detected temperature To is equal to or lower than a predetermined temperature T2 (for example, 5 ° C.) ( In step S4, the compressor 38 is operated while maintaining the state in which the heat generating film 82 is heated (step S5). On the other hand, if the temperature To near the refrigerant outlet of the evaporator 36 detected by the evaporator outlet temperature sensor 56 is higher than the predetermined temperature T2 (No in step S4), it is assumed that there is no possibility of frost formation in the evaporator 36. The device 23 stops the voltage application to the heat generating coating 82 and stops the heating device 80 (step S6).

  In step S7, the control device 23 satisfies a predetermined drying end condition such that the temperature difference between the temperature detected by the air inlet temperature sensor 51 and the temperature detected by the exhaust air temperature sensor 52 is within a predetermined value. If the drying end condition is satisfied, the drying process is terminated. If not satisfied, the compressor 38 is continuously operated to continue the drying process.

  When continuing a drying process, the control apparatus 23 returns to step S4, and judges whether temperature To the refrigerant | coolant exit vicinity of the evaporator 36 detected by the evaporator exit temperature sensor 56 is below predetermined temperature T2. If the detected temperature To of the evaporator outlet temperature sensor 56 is higher than the predetermined temperature T2 (No in step S4), the compressor 38 is continuously operated while the heating device 80 is stopped (step S6). If (Yes in step S4), the compressor 38 is operated while operating the heating device 80 again because the temperature of the evaporator 36 is low and frost may be formed (step S5).

  In the present embodiment as described above, when the outside air temperature Tr detected by the outside air temperature sensor 57 is lower than a predetermined temperature when the heat pump 40 is started up, it is between the exhaust port 16 and the evaporator 36 in the circulation air passage 30. Since the heating device 80 heats the air, the frosting of the evaporator 36 can be prevented even when the temperature of the installation atmosphere of the washing / drying machine 10 is low, and the amount of air circulating through the circulation air passage 30 (air volume) ) Can be prevented. Therefore, the temperature of the air circulating through the circulation air passage 30 reaches a temperature suitable for drying clothes at an early stage, and the heat pump can be quickly started up.

  In addition, since the heat generating film 82 that heats the air in the circulation air passage 30 in the heating device 80 has a film shape that covers the surface facing the circulation air passage 30, the heating device 80 is provided in the circulation air passage 30. It does not impede the flow of air and reduce the efficiency of drying clothes.

  In addition, since the heat generation coating 82 has a high degree of freedom in the shape and position of the surface on which the heating coating 82 is provided, the heating device 80 can be easily placed in the circulation air passage 30.

  In the present embodiment, since the heat generation coating 82 covering the inner wall surface 33a of the connection duct 33 heats the air in the circulation air passage 30, the heat generation portion in the heating device 80 can be provided in a wide range. Therefore, the air in the circulation air passage 30 can be heated without setting the heat generation temperature of the heat generation coating 82 to a high temperature.

  In this embodiment, after the compressor 38 is started, the heat pump 40 is normally started and the exhaust port 16 and the exhaust port 16 are stopped in order to stop the heat generation of the heating device 80 when the temperature near the refrigerant outlet of the evaporator 36 is higher than the predetermined temperature T2. When heating of the air between the evaporator 36 becomes unnecessary, the heating device 80 is stopped and the power consumption can be suppressed, and the temperature of the air supplied to the evaporator 36 becomes excessively high, and the evaporator 36. It can suppress that the dehumidification performance of this falls.

  In the present embodiment, after the compressor 38 is started, when the temperature near the refrigerant outlet of the evaporator 36 becomes equal to or lower than the predetermined temperature T2, the control device 23 operates the heating device 80 to evaporate with the exhaust port 16 in the circulation air passage 30. Since the air between the evaporator 36 is heated, even when the evaporator 36 is likely to be frosted after the start of the drying process, the frosting of the evaporator 36 can be prevented and the circulation air passage 30 can be prevented. It is possible to prevent a reduction in drying efficiency due to a decrease in the amount of air circulating through the air.

  In the above-described embodiment, the heating device 80 is operated and stopped based on the temperature near the refrigerant outlet of the evaporator 36 after the compressor 38 is started. The operation and stop of the heating device 80 may be controlled based on the temperature in the vicinity of the refrigerant inlet of the evaporator 36, the temperature of the fins constituting the evaporator 36, and the like.

  In the first embodiment described above, the case where the heat generating film 82 constituting the heating device 80 is provided on the inner wall surface 33a of the connection duct 33 has been described. The surface is not limited and may be a surface facing the inside of the circulation air passage 30 between the exhaust port 16 and the evaporator 36. A heat generation film 82 can be provided on the surface of the fin 36b to be formed.

  When the heat generating coating 82 is provided on the surface of the wind direction plate 42a, the wind direction plate 42a guides the air blown from the connection duct 33 extending in the vertical direction to the heat exchange duct 34 extending in the horizontal direction. Since the heat of the heat generation coating 82 can be efficiently transmitted easily through contact with the air flowing through the air, the air in the circulation air passage 30 can be heated even if the heat generation coating 82 has a small arrangement area, and evaporation The frosting of the container 36 can be prevented. Further, when the heat generating film 82 is provided on the surface of the fin 36b constituting the evaporator 36, the evaporator 36 can be directly heated, and the frosting of the evaporator 36 can be efficiently prevented.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to the drawings.

  In the present embodiment, the amount of heat generated during operation of the heating device 80 changes based on the temperature difference between the detected temperatures detected by the outside air temperature sensor 57 and the exhaust port temperature sensor 52.

  Specifically, as shown in FIG. 10, the temperature Te of the air exhausted from the water tank 12 and the rotating drum 13 detected by the exhaust outlet temperature sensor 52 and passing through the exhaust duct 31, and the washing detected by the outside air temperature sensor 57 are detected. When the temperature difference ΔT (= Te−Tr) with respect to the temperature Tr of the installation atmosphere of the dryer 10 is 0 ° C. or less, from 0 ° C. to 15 ° C., from 15 ° C. to 30 ° C., the control device 23 Is set to 20V, 15V, and 10V, and the voltage applied to the heat generating film 82 is set to 0V when the temperature difference ΔT is larger than 30 ° C. Stop.

  As the temperature Te of the air exhausted from the water tank 12 and the rotary drum 13 to the exhaust duct 31 becomes higher than the temperature Tr of the installation atmosphere of the washing / drying machine 10, the temperature of the air passing through the evaporator 36 becomes higher. Since it becomes difficult to form frost, the temperature of the air supplied to the evaporator 36 is excessively high by reducing the voltage applied to the heat generation coating 82 as the ΔT increases as in the present embodiment. Therefore, it can suppress that the dehumidification performance of the evaporator 36 falls.

  As mentioned above, although embodiment of this invention was described, these embodiment was shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

DESCRIPTION OF SYMBOLS 10 ... Washing and drying machine, 11 ... Outer box, 12 ... Water tank, 13 ... Rotating drum, 16 ... Exhaust port, 17 ... Air supply port, 23 ... Control device, 30 ... Circulation air path, 31 ... Exhaust duct, 33 ... Connection Duct, 33a ... inner wall surface, 34 ... heat exchange duct, 36 ... evaporator, 37 ... condenser, 38 ... compressor, 39 ... decompression device, 40 ... heat pump, 41 ... blower, 42 ... compressor cover, 42a ... wind direction Plate 57: Outside air temperature sensor 80 ... Heating device 82 ... Heat generation film 84 ... Power supply unit 84a ... Application electrode 84b ... Power generation unit 86 ... Lead wire

Claims (7)

A drying chamber having an exhaust port and an air supply port;
A circulation air passage provided outside the drying chamber and connecting the exhaust port and the air supply port;
A blower for circulating air into the drying chamber through the circulation air passage;
A condenser that heats the air in the circulation air passage, an evaporator that cools and dehumidifies the air in the circulation air passage, a compressor that compresses a refrigerant and supplies the refrigerant to the condenser, and a condenser. A heat pump comprising a decompression device for decompressing the refrigerant,
A heating device for heating air between the exhaust port and the evaporator in the circulation air passage;
An outside air temperature sensor that detects the temperature of the installation atmosphere;
A controller that generates heat when the temperature of the installation atmosphere detected by the outside air temperature sensor when the heat pump is started is lower than a predetermined temperature, and
The said heating apparatus is a clothes dryer provided with the heat generating film which coat | covers the surface which faced in the said circulation air path between the said exhaust port and the said evaporator, and the power supply part which applies a voltage to the said heat generating film.   The clothes dryer according to claim 1, wherein the heat generation coating covers an inner wall surface of the circulation air passage. The circulation air path includes a connection duct extending in a vertical direction, a heat exchange duct extending in a horizontal direction from a downstream side of the connection duct and having the evaporator and the condenser disposed therein, and air in the connection duct. A wind direction plate for guiding to the heat exchange duct,
The clothes dryer according to claim 1, wherein the heat generation coating covers a surface of the wind direction plate. The evaporator includes a refrigerant pipe through which a refrigerant flows, and fins attached to the refrigerant pipe,
The clothes dryer according to claim 1, wherein the heat generation coating covers a surface of the fin. An evaporator temperature sensor for detecting the temperature of the evaporator;
The clothes dryer according to any one of claims 1 to 4, wherein when the temperature detected by the evaporator temperature sensor is equal to or higher than a predetermined temperature, the control device stops heat generation of the heating device. An exhaust port temperature sensor for detecting the temperature of air between the evaporator and the exhaust port in the circulation air passage;
The said control apparatus sets the voltage which the said power supply part applies to the said heat generating film based on the difference of the detected temperature detected by the said external temperature sensor and the said exhaust-port temperature sensor. The clothes dryer according to item. An evaporator temperature sensor for detecting the temperature of the evaporator;
The clothes dryer according to any one of claims 1 to 6, wherein the control device causes the heating device to generate heat when a temperature detected by the evaporator temperature sensor becomes equal to or lower than a predetermined temperature after the heat pump is started.

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