hair dryer

Abstract

To provide a hair dryer capable of efficiently discharging a blown air current over a wide range. [Solution] The hair dryer has a cylindrical main housing with an air outlet on the front side and an air intake on the rear side, and an air blower. It also has an inner cylinder arranged inside the main housing, a heater arranged inside the air passage defined between the main housing and the inner cylinder, a cylindrical housing that holds the air blower inside and is arranged upstream of the inner cylinder, and a connecting portion that connects the air passage and the cylindrical housing and is formed in a truncated cone shape. The main housing has a front cover that covers the downstream side of the air passage, the inner cylinder has a first partition that closes the upstream side of the air flow, and the front cover has a second partition that closes the downstream side of the inner cylinder and multiple air outlets formed around the second partition, and the air outlets are formed in the shape of slits that communicate with the air passage and are arranged circumferentially.

Description

[Technical Field]

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

[0002] Conventionally, there has been known a hair dryer in which airflow blown by a blower is heated by a heater and then discharged from an outlet in a main body housing (see, for example, Patent Document 1). The blower is composed of a blowing fan and a motor that drives the fan.

[0003] Furthermore, in the hair dryer described in Patent Document 1, the air outlet is formed in the shape of a long, thin slit to increase the speed of the discharged airflow. Also, in the hair dryer described in Patent Document 1, a blower is built into the handle connected to the main body housing, and air is drawn in through a fluid inlet (air intake) formed at the bottom end of the handle. The air is then sent from the handle to the main body housing by the blower, and the airflow heated by the heater is discharged from the air outlet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6854109 Summary of the Invention [Problem to be solved by the invention]

[0005] When a small motor and fan are used as the air blower, it is preferable to incorporate the air blower into the main body housing in order to reduce the size and power consumption of the hair dryer. Furthermore, when a small motor and fan are used, the airflow blown by the air blower must be efficiently and widely dispersed. However, the hair dryer described in Patent Document 1 has the air blower mounted on the handle, which does not allow the airflow blown by the air blower to be efficiently and widely dispersed.

[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 spread and discharge the airflow over a wide range. [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 the front side and an air intake on the rear side, and an air blower disposed within the main housing, the hair dryer including an inner cylinder disposed within the main housing, an air passage defined between the main housing and the inner cylinder, a heater disposed within the air passage for heating the air flow generated by the air blower, a cylindrical housing that holds the air blower and has an inner diameter smaller than the air passage and is disposed upstream of the inner cylinder, and a heater disposed between the air passage and the cylindrical housing. a connecting portion formed in a truncated cone shape that connects the main housing to the housing and whose inner diameter increases from the upstream side to the downstream side of the airflow, the main housing having a front cover that covers the downstream side of the airflow relative to the airflow passage, the inner cylinder having a first partition wall that closes the upstream side of the airflow, the front cover having a second partition wall that closes the downstream side of the airflow relative to the inner cylinder and a plurality of air outlets formed around the second partition wall, the air outlets being formed in the shape of slits that communicate with the airflow passage and arranged circumferentially around the inner cylinder. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a hair dryer that can efficiently spread and discharge the airflow over a wide range. [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. 2 is a perspective view of an inner cylinder, a sensor support pole, and a temperature sensor attached to the sensor support pole. [Figure 8] 2 is a cross-sectional view of a main part of the hair dryer taken along a plane passing through the central axis of the main body housing and the temperature sensor. FIG. 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, seen from the front; FIG. 2 is a perspective view of the hair dryer 1, 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 3, 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 that drives 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 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 by the inner cylinder 31 and 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 cylindrical body 35. The front cover 36 has a second partition wall 39 that closes the downstream side of the inner cylindrical body 31, and a plurality of air outlets 22 formed around the second partition wall 39. The second partition wall 39 is formed in a concave shape that is concave from the downstream side to the upstream side.

[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] 3 to 5, the inner cylinder 31 is located inside the outer cylinder 35 and has a first partition wall 41 that closes the upstream side. A through hole 41a is formed in the first partition wall 41. The through hole 41a passes through the first partition wall 41 parallel to the central axis O.

[0025] The inner cylinder 31 has a first tapered outer peripheral surface 42, a constant diameter outer peripheral surface 43, and a second tapered outer peripheral surface 44. 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 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°. The heater 8 is, for example, a bent electric heating wire that is spirally wound around the outer edge of the heater support plate 45. Electric power is supplied to the heater 8 under the control of a control circuit (described later), and the temperature of the heater 8 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 air outlet 22.

[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] The second tapered outer peripheral surface 44 has a longer axial dimension than the narrowed portion 35a, and there is a distance D between the upstream end of the second tapered outer peripheral surface 44 and the upstream end of the narrowed portion 35a.

[0031] [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.

[0032] 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.

[0033] [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.

[0034] 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.

[0035] 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.

[0036] 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).

[0037] Next, the sensor support pole 51 will be described with reference to Fig. 7 and Fig. 8. Fig. 7 is a perspective view of the inner cylinder, the sensor support pole, and the temperature sensor attached to the sensor support pole, and Fig. 8 is a cross-sectional view of the main part of the hair dryer taken along a plane passing through the central axis of the main housing and the temperature sensor. Note that Fig. 7 does not show the heater 8 supported by the heater support plate 45.

[0038] [Configuration of sensor support column 51] As shown in Figures 7 and 8, a pair of sensor support columns 51 are integrally provided on the inner cylindrical body 31. The pair of sensor support columns 51 have openings that support both ends of a temperature sensor 52. The temperature sensor 52 is, for example, a thermistor. The sensor support columns 51 are erected radially outward from the second tapered outer peripheral surface 44 of the inner cylindrical body 31. This causes the sensor support columns 51 to protrude into the air outlet 22. The temperature sensor 52 supported by the sensor support columns 51 can measure the temperature of the airflow passing through the inside of the air outlet 22. The temperature sensor 52 is also installed at the center of the heater support plate 45 in the circumferential direction of the inner cylindrical body 31.

[0039] The sensor support pole 51 is inserted into a notch 31a formed in the downstream tip of the inner cylindrical body 31 and is fixed to the inner cylindrical body 31 by adhesive or the like. The temperature sensor 52 is connected to the second circuit board 49.

[0040] As described above, second circuit board 49 is connected to first circuit board 12, and first circuit board 12 controls the power supplied to each component in response to the user's operation of switches 9 to 11. Second circuit board 49 controls motor 5 and heater 8 in response to a control signal from first circuit board 12 and a temperature detection signal from temperature sensor 52. Specifically, second circuit board 49 controls motor 5 and heater 8 in response to a temperature measurement value corresponding to the temperature detection signal and the selection state of switches 9 to 11.

[0041] Furthermore, the second circuit board 49 controls the high voltage generator 27 in response to a temperature detection signal from the temperature sensor 52. This allows the positive and negative ions to be emitted from the positive and negative ion generating electrodes in accordance with the temperature conditions of the outside air and the airflow, and allows the positive and negative ions to be mixed into the airflow discharged from the air outlet 22. Thus, an appropriate amount of positive and negative ions can be constantly emitted in accordance with the usage environment of the hair dryer 1.

[0042] [Effects of the embodiment] As described above, the hair dryer 1 according to this embodiment can achieve the following effects.

[0043] The connecting portion 33 connects the air flow 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 W1 (see FIG. 3) generated by the air blower 7 to be efficiently spread over a wide range and sent into the air flow passage 34. Furthermore, the airflow W1 generated by the air blower 7 is heated by the heater 8 disposed inside the air flow passage 34 defined between the main housing 2 and the inner cylinder 31, and the heated airflow W1 is discharged from the air outlet 22 communicating with the air flow passage 34. This allows the airflow W1 sent from the air blower 7 through the connecting portion 33 to be spread and discharged over a wide range. Furthermore, the multiple air outlets 22 are formed in slit shapes around the second partition wall 39 that closes the downstream side of the inner cylinder 31 and are arranged circumferentially around the inner cylinder 31. This allows the airflow W1 to be discharged over a wide range from the air outlet 22 and the speed of the airflow W1 to be increased.

[0044] Furthermore, since there is a distance D between the upstream end of the second tapered outer peripheral surface 44 and the upstream end of the narrowed portion 35a, the wind pressure of the airflow in the air passage 34 can be reduced compared to when the upstream end of the second tapered outer peripheral surface 44 and the upstream end of the narrowed portion 35a are aligned. Furthermore, reducing the wind pressure makes it possible to suppress noise generated by the hair dryer 1 and make the airflow W1 discharged from the air outlet 22 approximately parallel to the axial direction. Furthermore, heat generated by the heater 8 can be imparted to the entire airflow W1 passing through the air passage 34.

[0045] Furthermore, the inner cylinder 31 is formed with a first tapered outer peripheral surface 42 that is formed on the outer peripheral surface of the first partition wall 41 that closes the upstream side and that has an outer diameter that increases from the upstream side to the downstream side, so that the airflow W1 blown from the blower 7 can be smoothly expanded over a wide range and sent into the air passage 34. Furthermore, the inner cylinder 31 is formed with a second tapered outer peripheral surface 44 that has an outer diameter that increases toward the second partition wall 39 that closes the downstream side, so that the air passage 34 has a shape that tapers toward the air outlet 22, allowing the air to be discharged over a wide range from the air outlet 22 and further increasing the speed of the airflow W1.

[0046] Furthermore, a plurality of rectifying fins 46 are provided upright at intervals in the circumferential direction on the first tapered outer peripheral surface 42, and the rectifying fins 46 are arranged at different positions in the circumferential direction from the heater support plate 45 that supports the heater 8, so that the airflow W1 dispersed by the rectifying fins 46 hits the heater 8. More specifically, the airflow W1 blown from the blower 7 is efficiently dispersed by the rectifying fins 46, so that it can hit the heater 8 with uniform pressure and volume. Furthermore, the airflow W1 heated to an appropriate temperature by the heater 8 can be discharged from the air outlet 22.

[0047] Furthermore, since the sensor support column 51 integrally provided with the inner cylindrical body 31 protrudes into the air outlet 22, the temperature sensor 52 supported by the sensor support column 51 can measure the temperature of the airflow W1 passing through the inside of the air outlet 22. This allows the temperature of the airflow W1 near the air outlet 22 to be accurately measured and fed back to the control circuit, thereby enabling appropriate control of the motor 5 and the heater 8. Furthermore, since the temperature sensor 52 supported by the sensor support column 51 is installed at the center of the heater support plate 45 in the circumferential direction of the inner cylindrical body 31, it can accurately measure the temperature of the airflow W1 heated by the heater 8. Furthermore, since the temperature sensor 52 is supported by the sensor support column 51, its radial and circumferential positions within the air passage 34 are accurately positioned. This reduces variations in the assembly process of the temperature sensor 52, making it possible to achieve high-precision and uniform performance in measuring the temperature of the airflow W1.

[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. [Explanation of symbols]

[0049] 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 32 Motor housing 33 Connection 34 Ventilation passage 35 outer cylinder 36 Front cover 37 Outer cover 38 Fixed ring 39 Second bulkhead 41 First Bulkhead 42 First tapered outer surface 43 Equal diameter outer circumferential surface 44 Second tapered outer surface 45 Heater support plate 46 Straightening fin 51 Sensor support column 52 Temperature Sensor

Claims

1. A hair dryer having a cylindrical main body housing having an air outlet on a front side and an air intake on a rear side, and a blower device disposed within the main body housing, an inner cylinder disposed inside the main body housing; a heater disposed inside an air passage defined between the main housing and the inner cylinder, the heater heating the airflow generated by the air blower; a cylindrical housing that holds the air blower therein, that is formed in a cylindrical shape with an inner diameter smaller than the air blowing passage, and that is disposed upstream of the air flow relative to the inner cylinder; a connecting portion that connects the air passage and the cylindrical housing and is formed in a truncated cone shape whose inner diameter increases from the upstream side to the downstream side of the air flow, the main body housing has a front cover that covers a downstream side of the airflow with respect to the airflow passage, the inner cylinder has a first partition wall that closes the upstream side of the airflow, The front cover is a second partition wall that closes the inner cylinder body on a downstream side of the airflow; a plurality of the air outlets formed around the second partition wall, The air outlet is A hair dryer characterized in that the air passages are formed in a slit shape communicating with the air passage and are arranged in a circumferential direction around the inner cylinder.

2. The hair dryer according to claim 1, The inner cylinder is a first tapered outer circumferential surface formed on an outer circumferential surface of the first partition wall, the outer diameter of which increases from the upstream side to the downstream side of the airflow; a constant diameter outer circumferential surface extending from the first tapered outer circumferential surface along the axial direction of the main body housing with a constant diameter dimension; a second tapered outer peripheral surface whose outer diameter increases from the constant diameter outer peripheral surface toward the second partition wall.

3. 3. The hair dryer according to claim 2, a plurality of flow straightening fins are provided on the first tapered outer peripheral surface at intervals in the circumferential direction, a plurality of heater support plates are provided on the uniformly sized outer peripheral surface at intervals in the circumferential direction, and the heater is supported by the heater support plates; The hair dryer according to claim 1, wherein the rectifying fins are disposed at positions different from the heater support plate in the circumferential direction.

4. The hair dryer according to claim 1, a sensor support column provided integrally with the inner cylinder; The sensor support column protrudes into the air outlet and supports a temperature sensor. A hair dryer characterized by:

5. The hair dryer according to claim 1, the main body housing includes an outer cylinder body that defines the air passage together with the inner cylinder body and has a downstream end surface connected to the front cover; the outer cylinder body has a tapered portion whose radial dimension decreases toward the front cover, the second tapered outer peripheral surface has a longer axial dimension than the throttle portion, a gap between the upstream end of the second tapered outer peripheral surface and the upstream end of the throttle portion;

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