Hair dryer

Abstract

To provide a hair drier capable of efficiently radiating far infrared rays.SOLUTION: This hair dryer 1 is provided with a cylindrical body housing 2 incorporating a blower 7 and an inner cylinder body 31 arranged inside the body housing 2, a heater 8 is arranged inside a blow passage 3 formed between the body housing 2 and the inner cylinder body 3, a front cover 36 (front face plate) arranged on the front side of the body housing 2 has a second partition wall 39 (closed front face) closing a downstream side opening of the inner cylinder body 3, and a far-infrared ray emitting material layer 50 is provided on the surface of the second partition wall 39.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a hair dryer. [Background technology]

[0002] Conventionally, there has been known a hair dryer that is configured to have a conical hot air guide that guides the flow of hot air so that it forms a ring-shaped flow along the inner wall surface of the main housing, and a far-infrared emitting material layer on the front side of the main housing, and a heat-receiving member that extends continuously from this far-infrared emitting material layer and is positioned within the ring-shaped flow, thereby transferring heat received from the hot air to the far-infrared emitting material layer via the heat-receiving member made of a thin metal plate (see, for example, Patent Document 1).

[0003] According to the hair dryer described in Patent Document 1, when the hot air heated by the heater passes between the outer peripheral surface of the conical hot air guide and the inner wall surface of the main housing, the hot air heats the heat-receiving member and is thermally conducted to the far-infrared emitting material layer, thereby enabling stable emission of far-infrared rays. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4420059 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the hair dryer described in Patent Document 1, a band-shaped heat-receiving member extending from the periphery of the far-infrared emitting material layer is positioned in the flow of hot air, and the heat of the heat-receiving member heated by the hot air is transferred to the periphery of the far-infrared emitting material layer. This makes it difficult for the heat of the heat-receiving member to be transferred to the entire far-infrared emitting material layer, and there is room for improvement from the perspective of efficiently radiating far-infrared rays.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hair dryer that can efficiently radiate far infrared rays. [Means for solving the problem]

[0007] In order to achieve the above object, one aspect of the present invention is a hair dryer having a cylindrical main housing having an air outlet on a front side and an air intake on a rear side, an air blower disposed within the main housing, and a heater for heating the airflow generated by the air blower, the hair dryer further comprising: a front panel disposed on the front side of the main housing; and an inner cylinder disposed inside the main housing along the axial direction, wherein an air flow passage for the airflow is defined between the main housing and the inner cylinder, and the heater is disposed inside the air flow passage, the inner cylinder has an internal space that closes the upstream side of the airflow and is open on the downstream side, the front panel has a closed front surface located in the center of the main housing and covers the opening of the inner cylinder, and the air outlet is located around the closed front surface and communicates with the air flow passage, and the closed front surface is provided with a far-infrared emitting material. [Effects of the Invention]

[0008] According to the present invention, a hair dryer capable of efficiently emitting far infrared rays can be provided. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a hair dryer according to an embodiment of the present invention, as viewed from the front. [Figure 2] FIG. 2 is a perspective view of the hair dryer as viewed from the rear. [Figure 3] FIG. 2 is a cross-sectional view of the hair dryer. [Figure 4] FIG. 2 is an exploded perspective view of the hair dryer. [Figure 5] FIG. 2 is a perspective view of a front cover, an outer cylinder, an inner cylinder, a heater, a motor housing, and a motor. [Figure 6] FIG. 6 is a cross-sectional view of a main part taken along line VI-VI in FIG. [Figure 7] FIG. 3 is an enlarged cross-sectional view showing the front cover. [Figure 8] FIG. 10 is a perspective view of a main part of a hair dryer showing a modified example of the front cover. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0011] FIG. 1 is a perspective view of a hair dryer 1 according to an embodiment, as seen from the front; FIG. 2 is a perspective view of the hair dryer 1, as seen from the rear; FIG. 3 is a cross-sectional view of the hair dryer 1; and FIG. 4 is an exploded perspective view of the hair dryer 1.

[0012] [Overall configuration of Hair Dryer 1] As shown in Figures 1 to 4, the hair dryer 1 according to this embodiment mainly comprises a cylindrical main body housing 2, a handle portion 3 connected to the main body housing 2, a blower fan 4 arranged within the main body housing 2, and a motor 5 for driving the fan 4.

[0013] The main body housing 2 has, at both opposing ends, an air intake 21 and an air outlet 22. The air intake 21 is provided on the rear end side of the main body housing 2, and air is drawn into the main body housing 2 through the air intake 21.

[0014] The fan 4 and motor 5 constitute the blower 7, which outputs air drawn in through the air intake 21 as an airflow toward the air outlet 22. The motor 5 is a small motor such as a DC motor. The blower 7 is disposed on the central axis O (see FIG. 3) of the main body housing 2, with the fan 4 facing the air intake 21. Hereinafter, the upstream side of the airflow generated by the blower 7 (the side where the air intake 21 is located relative to the blower 7) will be referred to simply as the "upstream side," and the downstream side of the airflow (the side where the air outlet 22 is located relative to the blower 7) will be referred to simply as the "downstream side." A heater 8 is disposed inside the main body housing 2 to heat the airflow generated by the blower 7 to generate warm air.

[0015] The handle 3 is provided with a push switch 9 for turning the power on and off, a slide switch 10 for adjusting the airflow rate, and a push switch 11 for switching between hot and cold air modes. The handle 3 also houses a first circuit board 12 for a control circuit that controls the entire hair dryer 1, and electronic components such as switches and sensors are also mounted on this first circuit board 12. A power cord 13 is connected to the first circuit board 12, and this power cord 13 is led out from the bottom end of the handle 3.

[0016] The inside of the air intake 21 is covered with a mesh filter 23 and a grill cover 24 (rear cover). The mesh filter 23 makes it difficult for foreign matter such as dust and hair to get into the main housing 2. The grill cover 24 has a plurality of ribs 24a (see FIG. 2) arranged in parallel and at equal intervals. The grill cover 24 allows air to pass through the ventilation holes defined by the ribs 24a. The grill cover 24 is located upstream of the mesh filter 23.

[0017] An inner cylindrical body 31, a motor housing 32 (cylindrical housing), a connection part 33, a high-voltage generator 27, and a pair of ion generating electrodes (not shown) are provided inside the main body housing 2. The inner cylindrical body 31 is disposed along the direction of the central axis O of the main body housing 2.

[0018] The main housing 2 has an outer cylinder 35 that defines an air passage 34 together with the inner cylinder 31, a front cover 36 (front plate) that covers the downstream side of the air passage 34, an outer cover 37, and a fixing ring 38.

[0019] The outer cover 37 is disposed on the outer peripheral surface of the main housing 2. The outer cylinder 35 is a cylindrical member fixed to the inner peripheral surface of the outer cover 37. However, this is not limiting, and the outer cylinder 35 and the outer cover 37 may be formed integrally. The air passage 34 is an annular space defined between the outer peripheral surface of the inner cylinder 31 and the inner peripheral surface of the outer cylinder 35. The downstream end face of the outer cylinder 35 is connected to the front cover 36. In addition, the outer cylinder 35 has a narrowed portion 35a at its downstream end, the radial dimension of which narrows toward the front cover 36.

[0020] The front cover 36 is a disk-shaped member that fits onto the inner circumferential surface of the outer cover 37. The front cover 36 is formed integrally with the outer cylinder 35. The front cover 36 has a second partition wall 39 (closed front surface) that closes the downstream side of the inner cylinder 31, and a plurality of air outlets 22 formed around the second partition wall 39. The second partition wall 39 is located in the center passing through the central axis O of the main housing 2, and is formed into a concave curved surface that is concave from the downstream side to the upstream side. As will be described in detail later, a far-infrared emitting material layer 50 is provided on the surface of the front cover 36, including the second partition wall 39. Note that the far-infrared emitting material layer 50 is not shown in Figures 1, 3, 4, and 5.

[0021] The fixed ring 38 is located at the downstream end of the main housing 2 and is an annular member that fits onto the inner circumferential surface of the outer cover 37. The fixed ring 38 has a plurality of first locking holes 38a (see FIG. 4). The first locking holes 38a are through-holes that penetrate the fixed ring 38 in the radial direction. The inner circumferential surface of the outer cover 37 is formed with first locking claws 37a (see FIG. 4) that protrude radially inward. The first locking holes 38a are locked by the first locking claws 37a. This fixes the fixed ring 38 to the outer cover 37. The fixed ring 38 abuts against the front cover 36. This prevents the outer cylindrical body 35 and the front cover 36 from coming apart in the axial direction.

[0022] Next, the configuration of the inner cylindrical body 31, heater 8, motor housing 32, connecting portion 33, etc. will be described with reference to FIGS.

[0023] 4 is an exploded perspective view of the hair dryer 1, FIG. 5 is a perspective view of the front cover, outer cylinder, inner cylinder, heater, motor housing, and motor, and FIG. 6 is a cross-sectional view of the main parts taken along line VI-VI in FIG.

[0024] [Configuration of inner cylinder 31] As shown in FIGS. 3 to 5, the inner cylinder 31 is located inside the outer cylinder 35 at a distance, and has a first partition 41 (closed rear surface) that closes the upstream side. The inner cylinder 31 has an internal space 51 that is closed on the upstream side by the first partition 41 and is open on the downstream side. A through-hole 41a is formed in the first partition 41. The through-hole 41a passes through the first partition 41 parallel to the central axis O. The radial dimension (diameter) of the first partition 41 is smaller than the radial dimension of the second partition 39 formed in the front cover 36.

[0025] The inner cylinder 31 has a first tapered outer peripheral surface 42, a constant diameter outer peripheral surface 43 (introduction cylinder portion), and a second tapered outer peripheral surface 44 (inclined cylinder portion). The first tapered outer peripheral surface 42 is formed on the outer peripheral surface of the first partition wall 41 and is a tapered outer peripheral surface whose outer diameter increases from the upstream side to the downstream side. The constant diameter outer peripheral surface 43 is an outer peripheral surface that extends with a constant diameter from the first tapered outer peripheral surface 42 along the direction of the central axis O. The second tapered outer peripheral surface 44 is a tapered outer peripheral surface whose outer diameter increases from the constant diameter outer peripheral surface 43 toward the second partition wall 39 of the front cover 36.

[0026] [Heater 8 Configuration] The heater 8 is disposed inside the air passage 34. Specifically, the heater 8 is supported by a heater support plate 45 (support plate) disposed inside the air passage 34. The heater support plates 45 are erected on the uniform outer peripheral surface 43 of the inner cylindrical body 31 at intervals in the circumferential direction of the inner cylindrical body 31. In the example shown in FIG. 5, six heater support plates 45 are provided on the uniform outer peripheral surface 43 and are disposed at equal angular intervals of 60° in the circumferential direction. The heater 8 is, for example, a bent electric heating wire, which is wound spirally around the outer edge of the heater support plate 45. The heater 8 is supplied with power under the control of a control circuit (not shown), and its temperature increases. As a result, the airflow blown from the blower 7 is heated inside the air passage 34, and the heated air is discharged from the outlet 22. The heat from the heater 8 also heats the air in the internal space 51 of the inner cylindrical body 31, causing the temperature to increase.

[0027] [Configuration of rectifying fin 46] A plurality of rectifying fins 46 are provided upright on the first tapered outer peripheral surface 42. The plurality of rectifying fins 46 are arranged at intervals in the circumferential direction of the inner cylindrical body 31. More specifically, the plurality of rectifying fins 46 are integrally formed inside the connecting portion 33, and the inner cylindrical body 31 and the connecting portion 33 are connected and integrated together, whereby the rectifying fins 46 are arranged to surround the first tapered outer peripheral surface 42.

[0028] The rectifying fins 46 are arranged at positions different from the heater support plates 45 in the circumferential direction of the inner cylinder 31. Specifically, the rectifying fins 46 are arranged such that their positions in the circumferential direction of the inner cylinder 31 are aligned between adjacent heater support plates 45. As a result, the airflow blown from the blower 7 is dispersed by the rectifying fins 46 and sent into the air passage 34. Because the airflow is dispersed by the rectifying fins 46, the airflow is more likely to hit the heater 8 evenly. Furthermore, because the airflow hits the heater 8 evenly, partial heating of the heater 8 can be prevented.

[0029] [Configuration of air outlet 22] The air passage 34 communicates with a plurality of air outlets 22 formed in the front cover 36. The air outlets 22 are arranged in a circumferential direction around the inner cylinder 31 and the second partition wall 39. More specifically, the air outlets 22 are formed in the shape of arcuate slits centered on the central axis O. However, the shape of the air outlets 22 is not limited thereto, and they may be linear slit-shaped openings or multiple circular or polygonal through-holes. Alternatively, a combination of these slit-shaped openings and circular or polygonal through-holes may be used. As described above, the inner cylinder 31 has the second tapered outer peripheral surface 44, and the outer cylinder 35 has the narrowed portion 35a, so that the air passage 34 tapers toward the air outlets 22.

[0030] [Configuration of motor housing 32] The motor housing 32 holds the blower 7 therein and is formed in a cylindrical shape with an inner diameter smaller than the air passage 34. More specifically, the motor 5 is coaxially fixed to the motor housing 32 along the central axis O. The motor housing 32 is disposed upstream of the inner cylindrical body 31. The upstream end of the motor housing 32 is connected to the upstream end of the main housing 2. More specifically, the inner diameter of the motor housing 32 is approximately the same as the outer diameter of the constant diameter outer peripheral surface 43 of the inner cylindrical body 31.

[0031] A high-voltage generator 27 is also disposed on the outer peripheral surface of the motor housing 32. The high-voltage generator 27 supplies positive and negative high-voltage pulse voltages to a positive ion generating electrode and a negative ion generating electrode (not shown), respectively. The positive ion generating electrode and the negative ion generating electrode are disposed symmetrically with respect to the central axis O, and at least a portion of each electrode protrudes into the air passage 34. The positive and negative high voltages supplied from the high-voltage generator 27 cause positive and negative ions to be emitted from the tips of the positive ion generating electrode and the negative ion generating electrode, respectively.

[0032] [Configuration of connection part 33] The connecting portion 33 connects the air passage 34 and the motor housing 32, and is formed in a truncated cone shape with an inner diameter that increases from the upstream side to the downstream side. This allows the airflow generated by the blower 7 to pass through the connecting portion 33 and be sent into the air passage 34.

[0033] The connecting portion 33 is integrally formed with the aforementioned rectifying fin 46 and abutment portion 47. The abutment portion 47 is a disk-shaped member located at the center of the connecting portion 33 and has a female screw hole 47a in its center. The rectifying fin 46 connects the outer circumferential surface of the abutment portion 47 to the inner circumferential surface of the connecting portion 33. In other words, the abutment portion 47 is connected to the connecting portion 33 via the rectifying fin 46. The connecting portion 33 has a plurality of second engaging holes 33a (see FIG. 5). The second engaging holes 33a are through holes that penetrate the connecting portion 33 in the radial direction. Second engaging claws 35b that protrude radially outward are formed on the outer circumferential surface of the outer cylindrical body 35. The second engaging holes 33a are engaged with the second engaging claws 35b. This connects the connecting portion 33 to the outer cylindrical body 35.

[0034] The female screw hole 47a is threadedly engaged with a screw 48 (see FIG. 3) inserted into the through hole 41a of the first partition wall 41. This fastens the first partition wall 41 to the abutment portion 47. In other words, fastening the first partition wall 41 to the abutment portion 47 connects the inner cylinder body 31 to the connecting portion 33 and the motor housing 32.

[0035] A second circuit board 49 is disposed in the space defined between the motor housing 32 and the main housing 2. The second circuit board 49 is connected to the motor 5 and the first circuit board 12 via wiring (not shown).

[0036] Next, a description will be given of the far-infrared emitting material provided on the front cover 36. Fig. 7 is an enlarged cross-sectional view of the front cover 36.

[0037] [Far infrared structure of front cover 36] As shown in Fig. 7, a far-infrared emitting material layer 50 is provided on the entire surface of the front cover 36, including the second partition walls 39. The far-infrared emitting material layer 50 contains a far-infrared emitting material. Examples of far-infrared emitting materials include carbon, ceramic, iron oxide, nickel oxide, silicon carbide, and zircon. The far-infrared emitting material layer 50 is formed by applying a paint containing one or more of the above-mentioned far-infrared emitting materials to the surface of the front cover 36. The front cover 36 may be made of a molding material containing the far-infrared emitting material, or the front cover 36 itself may be made of the far-infrared emitting material.

[0038] The second partition wall 39 of the front cover 36 is disposed opposite to the opening of the internal space 51 of the inner cylinder 31 so as to close the opening. As described above, the air in the internal space 51 of the inner cylinder 31 is heated by the heat of the heater 8, and the second partition wall 39 is heated by the heated air in the internal space 51. As a result, far-infrared rays are radiated from the far-infrared emitting material layer 50 provided on the second partition wall 39. Since the second partition wall 39 has a concave curved surface, the surface area of ​​the far-infrared emitting material layer 50 is large, allowing for efficient radiation of far-infrared rays. In addition, since the front cover 36 is disposed downstream of the air passage 34 and is heated by the hot air from the air passage 34, far-infrared rays are also radiated from the far-infrared emitting material layer 50 provided on the front cover 36 around the second partition wall 39.

[0039] In the hair dryer 1 configured as described above, as indicated by the arrow W1 in Fig. 3, the airflow W1 generated by the blower device 7 passes through the air passage 34 from the air intake port 21 and heads toward the air outlet 22 of the front cover 36. At this time, since the heater 8 is disposed inside the air passage 34, the airflow W1 blown from the blower device 7 is heated inside the air passage 34, and the heated air is discharged from the air outlet 22. In addition, the air in the internal space 51 of the inner cylinder 31 is heated by the heat of the heater 8, and the second partition 39 of the front cover 36 is heated by the heated air in the internal space 51. As a result, far infrared rays are emitted from the far infrared emitting material layer 50 provided on the second partition 39.

[0040] [Effects of the embodiment] As described above, the hair dryer 1 according to this embodiment can achieve the following effects.

[0041] The inner cylinder 31 disposed inside the main housing 2 has an internal space 51 that blocks the upstream side of the airflow and opens the downstream side, and the heater 8 is disposed inside the air passage 34 defined between the main housing 2 and the inner cylinder 31, and the front cover 36 (front plate) disposed on the front side of the main housing 2 has a second partition wall 39 (closed front surface) that blocks the downstream opening of the inner cylinder 31, and a far-infrared emitting material layer 50 is provided on the surface of this second partition wall 39. Therefore, the second partition wall 39 is heated by the heated air in the internal space 51 of the inner cylinder 31 that rises in response to the heat of the heater 8, and far-infrared rays can be efficiently radiated from the far-infrared emitting material layer 50.

[0042] Moreover, since the airflow W1 generated by the blower 7 does not directly hit the second partition wall 39 on which the far-infrared emitting material layer 50 is provided, far-infrared rays are radiated without reducing the thermal energy to the far-infrared emitting material, and good radiation efficiency can be maintained. In this embodiment, the far-infrared emitting material layer 50 is provided on the entire surface of the front cover 36, but it is sufficient that it is provided on at least the surface of the second partition wall 39 facing the downstream opening of the inner cylinder 31.

[0043] Furthermore, since the second partition wall 39 of the front cover 36 is formed as a concave curved surface that is concave from the downstream side to the upstream side, the surface area of ​​the far-infrared emitting material layer 50 provided on the second partition wall 39 is large, and far-infrared rays can be radiated efficiently. Conversely, the second partition wall 39 may be formed as a convex curved surface that is convex from the upstream side to the downstream side.

[0044] The inner cylinder 31 also has a first partition wall 41 (rear blocking surface) that blocks the upstream side, a first tapered outer peripheral surface 42 formed on the outer peripheral surface of the first partition wall 41, a constant diameter outer peripheral surface 43 (introduction cylinder portion) that extends from the first tapered outer peripheral surface 42 in a constant diameter dimension along the direction of the central axis O, and a second tapered outer peripheral surface 44 (inclined cylinder portion) that continues from the constant diameter outer peripheral surface 43 while widening in diameter toward the second partition wall 39 of the front cover 36, with the diameter of the first partition wall 41 being smaller than the diameter of the second partition wall 39. This allows the airflow blown from the blower 7 to be sent into the air passage 34 outside the constant diameter outer peripheral surface 43, and then to be widened over a wide range along the second tapered outer peripheral surface 44 and discharged from the air outlet 22.

[0045] In addition, a plurality of heater support plates 45 are provided at intervals in the circumferential direction on the uniformly shaped outer peripheral surface 43 of the inner cylindrical body 31, and the heater 8 is supported on these heater support plates 45. This allows the heat generated by the heater 8 to be imparted to the entire airflow passing through the air passage 34, and the internal space 51 of the inner cylindrical body 31 to be efficiently heated by the heat from the heater 8.

[0046] [Variations] Next, a description will be given of a modified example of the front cover 36. Fig. 8 is a perspective view of the essential parts of the hair dryer 1 showing a modified example of the front cover 36.

[0047] In the modification shown in FIG. 8 , the second partition wall 39 of the front cover 36 that closes the downstream opening of the inner cylinder 31 is formed to have a shape with a plurality of (e.g., four) recesses 39a. Although not shown, the far-infrared emitting material layer 50 is provided on the entire surface of the front cover 36, including the recesses 39a. By forming a plurality of recesses 39a in the second partition wall 39 in this way, the surface area of ​​the far-infrared emitting material layer 50 provided on the second partition wall 39 is increased by the number of recesses 39a, thereby enabling efficient radiation of far-infrared rays. Note that the second partition wall 39 may be formed with a plurality of protrusions instead of the recesses 39a. Alternatively, the second partition wall 39 may be formed as a flat surface, although this does not increase the surface area of ​​the far-infrared emitting material layer 50.

[0048] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the gist of the present invention. The present invention covers all technical matters included in the technical ideas described in the claims. The above-described embodiments are preferred examples, but a person skilled in the art can realize various alternatives, modifications, variations, or improvements from the contents disclosed in this specification, and these are included in the technical scope described in the appended claims.

[0049] For example, in the above embodiment, a hair dryer 1 is described in which air is blown out from the air outlet 22 of the front cover 36, but it may also be provided with an air collection hood (not shown) that collects the air blown out from the air outlet 22, and such an air collection hood may be removably attached to the front end of the main housing 2. [Explanation of symbols]

[0050] 1 hair dryer 2 Main body housing 3 Handle 4 Fans 5 motors 7. Blower 8 Heater 21 Air intake 22 Air outlet 31 Inner cylinder 34 Ventilation passage 35 outer cylinder 36 Front cover (front panel) 39 Second bulkhead (front of occlusion) 39a Recess 41 First bulkhead (rear of occlusion) 42 First tapered outer surface 43 Equal diameter outer circumferential surface (introduction cylinder part) 44 Second tapered outer surface (inclined tube portion) 45 Heater support plate (support plate) 50 Far-infrared emitting material layer (far-infrared emitting material) 51 Interior Space

Claims

1. A hair dryer comprising: a cylindrical main body housing having an air outlet on a front side and an air intake on a rear side; an air blower disposed in the main body housing; and a heater for heating an airflow generated by the air blower, a front plate disposed on the front side of the main body housing; and an inner cylinder disposed inside the main body housing along the axial direction, an air passage for the air flow is defined between the main body housing and the inner cylinder, and the heater is disposed inside the air passage; the inner cylinder has an internal space that is closed on the upstream side of the airflow and is open on the downstream side, the front plate has a closing front surface located in a central portion of the main body housing and covering the opening of the inner cylinder body, and the air outlet located around the closing front surface and communicating with the air passage, The blocking front surface is provided with a far infrared emitting material. A hair dryer characterized by:

2. The hair dryer according to claim 1, The occluding front surface is a convex or concave curved surface. A hair dryer characterized by:

3. The hair dryer according to claim 1, a rear closed surface of the inner cylinder that covers the upstream side of the airflow has a diameter dimension that is smaller than the front closed surface of the front plate; A hair dryer characterized by:

4. The hair dryer according to claim 3, The inner cylindrical body has an introduction cylindrical portion extending with a constant diameter along the axial direction of the main body housing, and an inclined cylindrical portion extending continuously from the introduction cylindrical portion while increasing in diameter toward the closure front surface. A hair dryer characterized by:

5. The hair dryer according to claim 1, a plurality of support plates are provided on the outer surface of the inner cylinder body at intervals in the circumferential direction, and the heater is disposed inside the air passage while being supported by the support plates; A hair dryer characterized by:

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