Dryer

Abstract

To provide a dryer capable of increasing a heat quantity of a heater.SOLUTION: A dryer 10 includes: a casing 11; a fan 17 for forming the flow of air blown from the inside A1 of the casing 11 to the outside A2 of the casing 11; a heater arranged downstream of the fan 17 in an air flowing route in the inside A1 of the casing 11; and a heat sink 13 brought into contact with the heater downstream of the fan 17 in the air flowing route in the inside A1 of the casing 11, which diffuses the heat of the heater to the air in the inside A1 of the casing 11. A plurality of heat sinks 13 is provided. The heater is sandwiched by the plurality of heat sinks 13, and includes a first heater composed of carbon nano-tubes.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a hair dryer for drying a user's hair. [Background technology]

[0002] An example of a hair dryer for drying a user's hair is described in Patent Document 1. The hair dryer described in Patent Document 1 includes a housing having an air inlet and an air outlet, a fan installed in the housing near the air inlet and drawing air in through the air inlet and sending it out through the air outlet, a motor installed in the housing for rotating the fan, a thermoelectric module installed in the housing between the fan and the air outlet, and upper and lower heat sinks installed in the housing. The thermoelectric module is disposed between the upper and lower heat sinks, and the sides of the thermoelectric module are in contact with the upper and lower heat sinks.

[0003] In the dryer described in Patent Document 1, when the fan is rotated by the motor, air is drawn into the housing through the air inlet, forming an airflow within the housing. Heat from the thermoelectric module is transferred to the air within the housing via the upper and lower heat sinks. The air whose temperature has been increased within the housing is then released through the air outlet and used to dry the user's hair. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2011-521727 Summary of the Invention [Problem to be solved by the invention]

[0005] The inventors of the present application have recognized a problem in that the heat quantity of the heater in the dryer described in Patent Document 1 is insufficient.

[0006] An object of the present disclosure is to provide a dryer that can increase the heat output of the heater. [Means for solving the problem]

[0007] The present disclosure provides a dryer having a hollow casing, a blowing mechanism that forms a flow of air that is blown from inside the casing to outside the casing, a heater that is arranged inside the casing downstream of the blowing mechanism in the path along which the air flows, and a heat sink that is in contact with the heater inside the casing downstream of the blowing mechanism in the path along which the air flows and that dissipates heat from the heater into the air inside the casing, wherein a plurality of the heat sinks are provided, and the heater is sandwiched between the plurality of heat sinks and includes a first heater made of carbon nanotubes. [Effects of the Invention]

[0008] According to the dryer of the present disclosure, the heat quantity of the heater can be increased. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is an overall cross-sectional view showing an embodiment of a dryer. [Figure 2] 2 is a side cross-sectional view of the dryer of FIG. 1 taken along line II-II. [Figure 3] 2 is a side end view of the heat sink shown in FIG. 1 taken along line VV. [Figure 4] 4(A) is a side cross-sectional view showing another example of the configuration of the heat sink and first heater of FIG. 1, and FIG. 4(B) is a side end view of the heat sink and first heater shown in FIG. 4(A). [Figure 5] 1. FIG. 4 is a side cross-sectional view showing another example of the configuration of the heat sink and the first heater of FIG. [Figure 6]FIG. 6 is a side end view of the heat sink and first heater shown in FIG. 5. [Figure 7] FIG. 10 is a graph showing an example of measurement results of the temperature of air ejected from the outlet of the dryer. [Figure 8] FIG. 8(A) is a graph showing an example of the relationship between the voltage applied to the heater and the surface temperature of the heater, and FIG. 8(B) is a graph showing an example of the relationship between the wavelength of the heater (far infrared rays) and the emissivity. DETAILED DESCRIPTION OF THE INVENTION

[0010] (composition) One embodiment of a dryer is described with reference to the drawings. In all drawings for describing the dryer, the same components are generally designated by the same reference numerals, and repeated description thereof will be omitted. The dryer 10 includes a casing 11, a grip 12, a heat sink 13, a plate-shaped first heater 14, and a film-shaped second heater 15. The dryer 10 also includes an electric motor 16, a fan 17, a battery 18, a printed circuit board 19, a thermal fuse 20, a negative ion generator 21, and a heat retention layer 22. The casing 11 is, for example, a cylindrical body made of synthetic resin, as shown in FIG. 2.

[0011] A cover 23 is provided to cover the opening of the casing 11. The cover 23 can be attached to and detached from the casing 11. The cover 23 is made of, for example, synthetic resin, and has an air intake 24. A mesh 25 is attached to the cover 23. The mesh 25 is made of, for example, metal, and has numerous air holes. The inner diameter of the air holes in the mesh 25 is, for example, 0.1 mm or less. The inner diameter of the air holes in the mesh 25 is smaller than the inner diameter of the air intake 24 of the cover 23. The interior A1 and exterior A2 of the casing 11 are connected through the air intake 24 and the mesh 25.

[0012] The electric motor 16 and the fan 17 are provided inside the casing 11. The electric motor 16 and the fan 17 are a blower mechanism for drawing air from the outside A2 of the casing 11 into the inside A1 of the casing 11. The air drawn into the inside A1 generates forced convection. The electric motor 16 is a DC motor that is rotated by current supplied from a battery 18. The fan 17 is a blower rotated by the electric motor 16. The electric motor 16 and the fan 17 are arranged coaxially with an imaginary line B1 as the center. The imaginary line B1 is a straight line arranged along the air flow direction in the inside A1 of the casing 11. The imaginary line B1 is located, for example, at the center of the casing 11. The heat sink 13 is arranged inside the casing 11. The electric motor 16 is arranged between the heat sink 13 and the cover 23, and the fan 17 is arranged between the electric motor 16 and the cover 23, in the direction along the imaginary line B1.

[0013] Also provided is a mount 26 that protrudes from the outer peripheral surface of the casing 11. The mount 26 is integrated with the casing 11. A printed circuit board 19 is provided within the mount 26. The printed circuit board 19 has an electric circuit that is connected to the electric motor 16, the first heater 14, the second heater 15, the battery 18, the negative ion generator 21, an operation switch (not shown), and the like. A terminal 27 is provided within the mount 26, and an insertion hole 28 is provided in the mount 26. The terminal 27 is electrically connected to the electric circuit.

[0014] Grip 12 is made of, for example, synthetic resin, and can be attached to and detached from mount 26. Grip 12 is the part that a user holds with their hand, and battery 18 is provided inside grip 12. Battery 18 is a secondary battery that is rechargeable and conductive. A pin-type terminal 29 is electrically connected to battery 18. When grip 12 is attached to mount 26, terminal 29 enters mount 26 through insertion hole 28, and terminal 27 and terminal 29 are electrically connected.

[0015] The heat sink 13 is a heat dissipation member that transfers heat from the first heater 14 and the second heater 15 to the air. The heat sink 13 is made of a metal material with excellent thermal conductivity, such as aluminum or copper. A plurality of heat sinks 13 are provided in the circumferential direction around the imaginary line B1. FIG. 2 shows an example in which four divided heat sinks 13 are arranged in the circumferential direction around the imaginary line B1. Each heat sink 13 is arranged over a 90-degree range around the imaginary line B1.

[0016] In a plane perpendicular to the imaginary line B1, a circumscribing circle (not shown) tangent to the tips of all the heat dissipation fins 13A is a circle with its center at the imaginary line B1. Each heat sink 13 has a plurality of heat dissipation fins 13A extending in a direction along the imaginary line B1. The heat dissipation fins 13A provided on each heat sink 13 are arranged parallel to each other, and air passages C1 are formed between the heat dissipation fins 13A. Each air passage C1 extends in a direction along the imaginary line B1. Air drawn into the interior A1 generates forced convection and enters the air passages C1.

[0017] A storage space 40 is provided between the inner ends of the four heat sinks 13, extending between adjacent heat sinks 13. As shown in FIG. 2 , when each heat sink 13 is viewed in a plane perpendicular to the imaginary line B1, the storage space 40 has a generally cross-shaped configuration, with two straight lines intersecting. The storage space 40 has a width L2 in a region 40B farther from the imaginary line B1 than a width L1 in a region 40A closer to the imaginary line B1. Two first heaters 14 are accommodated in the storage space 40. The two first heaters 14 are both plate-shaped (sheet-shaped) and are accommodated in the storage space 40 in an L-shaped folded state. Therefore, the two first heaters 14 are sandwiched between the heat sinks 13 at portions corresponding to the regions 40A, and are in surface contact with the heat sinks 13.

[0018] Each of the two first heaters 14 is a planar heating element made of a large number of carbon nanotubes (CNTs). A single carbon nanotube is a cylindrical structure formed by carbon atoms linked together like a network, and the diameter of the single carbon nanotube is in the range of approximately 1 nm to 4 nm. A positive electrode (not shown) and a negative electrode (not shown) are connected to each of the two first heaters 14. Both the positive electrode and the negative electrode are arranged in region 40B. The two first heaters 14 are arranged spaced apart within the accommodation space 40. The first heater 14 is adapted to emit far infrared rays including terahertz (growth rays).

[0019] 3, a portion of the accommodation space 40 that is closest to the electric motor 16 in the direction along the imaginary line B1 is covered with a shielding material 30. The shielding material 30 is a heat-resistant synthetic resin, and is fixed to the end faces of the four heat sinks 13. The shielding material 30 is an element that prevents air drawn into the interior A1 of the casing 11 from entering the accommodation space 40, specifically, an element that separates the air from the first heater 14.

[0020] The thermal fuse 20 is disposed within the interior A1 of the casing 11. The thermal fuse 20 is attached, for example, to an end face of the heat sink 13. The thermal fuse 20 has the function of interrupting the electrical circuit applying voltage from the battery 18 to the first heater 14 and the second heater 15 when the temperature of the heat sink 13 reaches a predetermined temperature, for example, 300°C. The negative ion generator 21 is disposed between the heat dissipation fins 13A of one of the heat sinks 13, i.e., in the air passage C1. The negative ion generator 21 is, for example, of a corona discharge type. The negative ion generator 21 is electrically connected to the electrical circuit of the printed circuit board 19. When a high negative voltage is applied from the battery 18 to the electrodes of the negative ion generator 21 via the printed circuit board 19, the negative ion generator 21 generates a discharge in the air. At this time, electrons are emitted from the electrodes and attach to oxygen molecules in the air, converting the oxygen molecules into negative ions.

[0021] The film (sheet)-shaped second heater 15 is disposed inside the casing 11 and is disposed over the entire area of each heat sink 13 in the direction along the imaginary line B1. The film-shaped second heater 15 is wrapped around the outer periphery of the four heat sinks 13. That is, the second heater 15 is disposed in a circular shape centered on the imaginary line B1. The second heater 15 may be a single sheet, or multiple sheets may be disposed in the circumferential direction centered on the imaginary line B1. Furthermore, the second heater 15 may be divided into multiple pieces in the direction along the imaginary line B1 shown in FIG. 1. The second heater 15 is in contact with the tips of the heat dissipation fins 13A of the four heat sinks 13, respectively. The second heater 15 is configured similarly to the first heater 14 and has the same function as the first heater 14, for example.

[0022] Additionally, a shielding material 31 is provided outside the second heater 15, with the imaginary line B1 as the center. The shielding material 31 is non-air-permeable and is made of, for example, aluminum or a heat-resistant synthetic resin. The shielding material 31 is disposed inside the casing 11 in the direction along the imaginary line B1. The shielding material 31 covers the entire outer peripheral surface of the second heater 15, and an inward flange 31A is provided on the second heater 15 at a location closest to the electric motor 16 in the direction along the imaginary line B1. The inward flange 31A is provided in an annular shape with the imaginary line B1 as the center. The shielding material 31 is an element that separates the air drawn into the interior A1 of the casing 11 from the outside A2 of the casing 11, from the end of the second heater 15, and from the outer peripheral surface of the second heater 15.

[0023] The heat retention layer 22 covers a portion of the shielding material 31 in the direction along the imaginary line B1. In other words, the heat retention layer 22 has a cylindrical shape. The heat retention layer 22 is made of, for example, a material such as mica that has electrical insulation and heat resistance. Furthermore, an inward flange 11A is provided on the casing 11 at a location that is furthest from the cover 23 in the direction along the imaginary line B1. The inward flange 11A is provided in an annular shape with the imaginary line B1 as its center, and an outlet 32 is formed by the inward flange 11A. The inward flange 11A is in contact with an end of the shielding material 31, an end of the heat retention layer 22, and an end of the second heater 15.

[0024] (Examples of use and effects of a hair dryer) A user can turn on an operation switch provided at a predetermined location, for example, on the outer surface of the mount 26. This causes current to be supplied from the battery 18 to the electric motor 16, causing the electric motor 16 and the fan 17 to rotate. When the fan 17 rotates, air from the outside A2 of the casing 11 is sucked into the inside A1 of the casing 11 through the air intake 24 and mesh 25.

[0025] Furthermore, when the operation switch is turned on, the current from the battery 18 is supplied to the first heater 14 and the second heater 15 through the electrical circuit of the printed circuit board 19. This causes the first heater 14 and the second heater 15 to generate heat, i.e., their temperatures rise. The heat from the first heater 14 and the second heater 15 is transferred (diffused) to the heat sink 13. Air drawn into the interior A1 of the casing 11 passes through the air passage C1. The heat transferred from the first heater 14 and the second heater 15 to the heat dissipation fins 13A of the heat sink 13 is transferred to the air passing through the air passage C1, causing the temperature of the air to rise. The air (warm air) that has passed through the air passage C1 is blown out from the outlet 32 to the outside A2. Therefore, the user's hair can be dried with warm air.

[0026] The dryer 10 of this embodiment can ensure an air temperature of approximately 60°C at a position, for example, approximately 10 cm away from the air outlet 32. In addition, the heat from the first heater 14 and the second heater 15 is transferred to the heat sink 13, and far infrared rays, including terahertz rays, are emitted into the air from the carbon nanotubes that make up the first heater 14 and the second heater 15. Therefore, the user's hair can be dried with the warm air and far infrared rays.

[0027] Furthermore, the first heaters 14 are sandwiched between the heat sink 13, which is divided into multiple pieces. Therefore, the resistance of each first heater 14 can be reduced, thereby increasing the heat output of the first heater 14. The resistance of the carbon nanotubes constituting each first heater 14 can be reduced, thereby increasing the heat output of the first heater 14. Furthermore, if multiple second heaters 15 are provided, the resistance of each second heater 15 can be reduced, thereby increasing the heat output of the second heater 15. Furthermore, the resistance of the carbon nanotubes constituting each second heater 15 can be reduced, thereby increasing the heat output of the second heater 15. Furthermore, by electrically connecting multiple first heaters 14 in parallel, the resistance of the carbon nanotubes can be reduced, thereby increasing the heat output of the first heater 14. Furthermore, by electrically connecting multiple second heaters 15 in parallel, the resistance of the carbon nanotubes can be reduced, thereby increasing the heat output of the second heater 15.

[0028] Furthermore, the shielding material 30 covers the portion of the accommodation space 40 that is closest to the fan 17 in the direction along the imaginary line B1. This prevents the air drawn into the interior A1 from coming into contact with the first heater 14 before passing through the ventilation path C1 and being ejected to the exterior A2. This makes it difficult for the temperature rise of the first heater 14 to be hindered.

[0029] Furthermore, the inward flange 31A of the shielding material 31 covers the portion of the second heater 15 closest to the fan 17 in the direction along the imaginary line B1. This prevents air drawn into the interior A1 of the casing 11 from coming into contact with the end of the second heater 15. This prevents the temperature rise of the second heater 15 from being hindered. The electric motor 16 and the fan 17 are driven by a DC battery 18, which significantly reduces power consumption and allows for a unified power source. The shielding material 31 and the heat retention layer 22 are provided outside the heat sink 13 in the radial direction centered on the imaginary line B1. This prevents heat from the heat sink 13 from being transferred to the casing 11. This prevents heat from being transferred to the user's hand holding the casing 11.

[0030] A negative ion generator 21 is also provided in the air passage C1. This allows oxygen molecules contained in the air passing through the air passage C1 to be negatively ionized. Furthermore, when the temperature of the heat sink 13 reaches a predetermined temperature, for example, 300°C or higher, the thermal fuse 20 cuts off the electrical circuit of the printed circuit board 19. This prevents the first heater 14 and the second heater 15 of the dryer 10 from overheating.

[0031] (Another example of a heat sink) Other examples of the heat sink 13 and first heater 14 provided in the interior A1 of the casing 11 shown in FIG. 1 are shown in FIGS. 4(A) and 4(B). Six heat sinks 13 are arranged side by side in the circumferential direction around the imaginary line B1. That is, one heat sink 13 is arranged over a 60-degree range in the circumferential direction around the imaginary line B1. Similar to the heat sink 13 shown in FIG. 2, each of the six heat sinks 13 has heat dissipation fins 13A, and an air passage C1 is formed between the heat dissipation fins 13A. Furthermore, a storage space 40 is formed between adjacent heat sinks 13, and a first heater 14 is disposed in each storage space 40.

[0032] The first heater 14 is arranged in the accommodation space 40 in a V-shaped bent state within a plane perpendicular to the imaginary line B1. Therefore, due to the elastic restoring force of the first heater 14, a part of the surface of the first heater 14 is pressed against the heat sink 13, i.e., is in surface contact with the heat sink 13. The heat sink 13 and first heater 14 shown in Figures 4(A) and 4(B) can also achieve the same effects as the heat sink 13 and first heater 14 shown in Figures 2 and 3.

[0033] Other examples of heat sinks provided in the interior A1 of the casing 11 shown in FIG. 1 are shown in FIGS. 5 and 6. Two heat sinks 41 are provided inside the casing 11. The two heat sinks 41 are arranged adjacent to each other across an imaginary line B1. In other words, one heat sink 41 is divided so as to occupy a range of 180 degrees centered on the imaginary line B1. An accommodation space 42 is provided between the two heat sinks 41. The accommodation space 42 is arranged in a straight line passing through the imaginary line B1. The accommodation space 42 is provided over the entire longitudinal area of the heat sink 41.

[0034] In the accommodation space 42, the width L1 of an area 42A including the imaginary line B1 is greater than the width L2 of areas 42B located on both sides of the area 42A. Furthermore, the first heater 14 is accommodated in the accommodation space 42. Both first heaters 14 are plate-shaped. The first heater 14 is sandwiched between the areas of the heat sinks 13 corresponding to the areas 42A, and is in surface contact with the two heat sinks 13. In the accommodation space 42, a portion closest to the fan 17 in the direction along the imaginary line B1 is covered by a shielding material 30. Furthermore, the end of the second heater 15 closest to the fan 17 in the direction along the imaginary line B1 is covered by an inward flange 31A.

[0035] Each of the two heat sinks 41 has a plurality of heat dissipation fins 41A. The heat dissipation fins 41A are arranged parallel to each other. A circumscribing circle (not shown) connecting the tips of all of the heat dissipation fins 41A of the two heat sinks 41 is a circle with its center at the imaginary line B1. An air passage C2 is provided between the heat dissipation fins 41A. The negative ion generator 21 is disposed in one of the air passages C2. Furthermore, a second heater 15 is wound around the outer periphery of the two heat sinks 41.

[0036] When the dryer 10 shown in FIG. 1 includes the heat sink 41 shown in FIGS. 5 and 6, when an air flow in the interior A1 is formed by the fan 17, the air passes through the air passage C2 and is blown out from the outlet 32. Heat from the first heater 14 and the second heater 15 is dissipated into the air via the heat sink 13, and warm air is blown out from the outlet 32. The shielding material 30 also prevents the air flowing in the interior A1 from entering the accommodation space 42. This prevents contact between the first heater 14 and the air flowing in the interior A1. The inward flange 31A also prevents the air flowing in the interior A1 from contacting the end of the second heater 15. This provides the same effects as a dryer 10 having a heat sink 13.

[0037] (Temperature measurement results) FIG. 7 shows an example of measurement results of the temperature of air (hot air) blown out from the air outlet 32 of the dryer 10. Here, it is assumed that the rotation speed of the electric motor 16 is constant. The solid temperature line D1 is the measurement result at the center of the air outlet 32, i.e., the position corresponding to the imaginary line B1. The dashed temperature line D2 is the measurement result at a position corresponding to the outer side of the air outlet 32. Both temperature lines D1 and D2 tend to increase over time. Furthermore, in the example shown in FIG. 7, at the same time, the temperature of temperature line D1 is lower than the temperature of temperature line D2. Although not shown in FIG. 7, when the rotation speed of the electric motor 16 increases, the difference between temperature line D1 and temperature line D2 decreases relatively.

[0038] (Characteristics of the first heater 14 and the second heater 15) The characteristics of the first heater 14 and the second heater 15 are shown in Figures 8(A) and 8(B). Figure 8(A) is a graph showing an example of the relationship between the voltage applied to the heaters and the surface temperature of the heaters. The characteristics of the first heater 14 and the second heater 15 are shown by characteristic line F1, and the characteristics of the heater of the comparative example are shown by characteristic line F2. The heater of the comparative example is a metal heater. Both characteristic lines F1 and F2 show a tendency for the surface temperature to increase relatively as the applied voltage increases. It can be seen that, when the applied voltage is the same, the surface temperatures of the first heater 14 and the second heater 15 are higher than the surface temperature of the heater of the comparative example.

[0039] FIG. 8(B) is a graph showing an example of the relationship between the wavelength and emissivity of the heater (far infrared rays). The characteristics of the first heater 14 and the second heater 15 are shown by characteristic line G1, and the characteristics of the heater of the comparative example are shown by characteristic line G2. The heater of the comparative example is a metal-based heater. Both characteristic lines G1 and G2 show a tendency for the emissivity to decrease relatively as the wavelength increases. It can be seen that, for the same wavelength, the emissivity of the first heater 14 and the second heater 15 is higher than that of the heater of the comparative example. Although not shown, the thermal conductivity of the carbon nanotubes constituting the first heater 14 and the second heater 15 is, for example, 4,000 (W / m·k). Furthermore, the electrical conductivity of carbon nanotubes is, for example, 120 times higher than that of metal-based materials.

[0040] (others) The blower that draws air from outside the casing into the interior is not limited to a fan. The blower may have a push-type (not shown) structure, for example. A push-type blower has a structure in which air from outside the casing is drawn into the interior of the casing when a user operates a push lever. A stand (not shown) may also be provided so that the dryer can be placed upright. The stand has a structure into which the tip of the grip of the dryer is inserted. The stand may be connected to an AC power source and may have a mechanism for charging the battery. Furthermore, at least one of the first heater and the second heater may be formed of a graphene heater.

[0041] The heat-retaining layer may be formed by applying a heat-shielding paint (thermal insulating paint). The heat sinks provided inside the casing may be multiple, arranged in the circumferential direction around the imaginary line. The heat sinks may be divided into five parts in the circumferential direction around the imaginary line, or may be divided into eight parts in the circumferential direction around the imaginary line. The number of first heaters and second heaters may be either single or multiple. The shape of the casing in a plane perpendicular to the imaginary line passing through the center of the casing may be circular, elliptical, rectangular, or the like. The second heater may be, for example, a film heater, i.e., an electric heater composed of a planar heating element. The film heater may have a structure in which a heater wire is provided on a film substrate, or a structure in which a heater layer (conductive film) is provided on a film substrate.

[0042] An example of the technical meaning of the configuration described in this embodiment is as follows. The dryer 10 is an example of a dryer. The casing 11 is an example of a casing. The interior A1 is an example of the interior of a casing. The exterior A2 is an example of the exterior of a casing. The electric motor 16 and the fan 17 are examples of a blower mechanism. The electric motor 16 is an example of an electric motor. The fan 17 is an example of a fan. The first heater 14 is an example of a first heater. The second heater 15 is an example of a second heater. The heat sink 13 is an example of a heat sink. The shielding materials 30 and 31 are each an example of a shielding material. The battery 18 is an example of a battery. The storage space 40 is an example of a storage space. The heat retention layer 22 is an example of a heat retention material. The imaginary line B1 shown in FIG. 2 is an example of a predetermined position. The shape of a circumscribed circle is an example of an outer periphery shape. A heater can also be defined as a heat generating element or a heat source. The imaginary line of the casing may also be defined as the centerline of the casing. [Industrial Applicability]

[0043] This embodiment can be used as a hair dryer for drying the user's hair. [Explanation of symbols]

[0044] 10... dryer, 11... casing, 13... heat sink, 14... first heater, 15... second heater, 16... electric motor, 17... fan, 18... battery, 22... heat retention layer, 30, 31... shielding material, A1... interior, A2... exterior, C1... ventilation path

Claims

1. a hollow casing; a blowing mechanism that forms a flow of air that blows from the inside of the casing to the outside of the casing; a heater disposed inside the casing and downstream of the blower mechanism along a path through which the air flows; a heat sink that is in contact with the heater inside the casing downstream of the blower mechanism along the air flow path and that dissipates heat from the heater into the air inside the casing; A dryer having The heat sink is provided in plurality, The heater includes a first heater sandwiched between the plurality of heat sinks and made of carbon nanotubes.

2. The dryer according to claim 1, The dryer, wherein the plurality of heat sinks are arranged in a plane perpendicular to an imaginary line along the air flow direction and in a circumferential direction around the imaginary line.

3. The dryer according to claim 2, In the dryer, four or more of the heat sinks are arranged in a plane perpendicular to the imaginary line, along a circumferential direction of a circle centered on the imaginary line.

4. The dryer according to claim 2, The dryer includes a second heater wound around the outside of the plurality of heat sinks in a radial direction centered on the imaginary line within a plane perpendicular to the imaginary line, and made of carbon nanotubes.

5. The dryer according to claim 1, The blower mechanism includes: an electric motor that is supplied with power and rotates; a fan rotated by the electric motor; and The dryer further includes a battery that supplies power to the electric motor.

6. 2. The dryer according to claim 1, The first heater is in surface contact with the heat sink.

7. 2. The dryer according to claim 1, The dryer further comprises a shielding material provided inside the casing and separating the air from the heater inside the casing.

8. 8. The dryer according to claim 7, The shielding material covers a portion of the heater that is closest to the air blowing mechanism.

9. The dryer according to claim 4, The dryer further comprises a heat retaining material provided inside the casing and covering the outside of the second heater.

Images