JP2020000669A - Blower - Google Patents

Abstract

To provide a blower with an external diameter that can be reduced without reducing a discharge rate of an air flow.SOLUTION: A blower A comprises a rotor unit 1, a stator unit 2, a bearing holding part 3, and a connection part 5. The rotor unit includes an impeller 13 including a plurality of moving blades 131 and a magnet 12 and is rotatable around a center axis C. The stator unit comprises a stator core and an insulator 7 covering part of the stator core and is disposed outside in a radial direction of the magnet. The bearing holding part is positioned on one side in the axial direction of the stator unit and holds a bearing for rotatably supporting the rotor unit. The connection part fixes the stator unit's end on the one side in the axial direction and the bearing holding part's end on the other side in the axial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a blower.

  In the hair dryer described in Patent Literature 1, a blower fan, a motor that drives the blower fan to rotate, and a heater that heats air accelerated by the blower fan are disposed substantially coaxially within the housing. The motor is housed in a front opening mounting frame held by the support legs.

Japanese Patent Publication No. 04-036683

  However, in the hair dryer described in Patent Literature 1, since the motor is covered by the mounting frame, the motor is hardly cooled, and it is difficult to increase the current supplied to the motor. Therefore, it is difficult to reduce the size of the motor and the size of the hair dryer.

  An object of the present invention is to provide a blower that can reduce the outer diameter without reducing the discharge amount of airflow.

  An exemplary blower of the present invention includes a rotor unit, a stator unit, a bearing holding unit, and a connection unit. The rotor unit has an impeller including a plurality of rotor blades and a magnet, and is rotatable around a central axis. The stator unit includes a stator core and an insulator covering a part of the stator core, and is disposed radially outside the magnet. The bearing holding portion is located on one axial side of the stator unit and holds a bearing that rotatably supports the rotor unit. The connecting portion fixes one end in the axial direction of the stator unit and the other end in the axial direction of the bearing holding portion.

  According to the exemplary blower of the present invention, the outer diameter can be reduced without reducing the discharge amount of the airflow.

FIG. 1 is a longitudinal sectional view of the blower according to the present embodiment. FIG. 2 is a partial sectional perspective view of the blower shown in FIG. FIG. 3 is a cross-sectional perspective view of the blower according to the present embodiment. FIG. 4 is a cross-sectional view of the blower according to the present embodiment. FIG. 5 is an enlarged view of a connecting portion of the blower according to the present embodiment. FIG. 6 is a perspective view of the stator unit. FIG. 7 is a cross-sectional view of a connecting portion according to a first modification of the embodiment of the present invention. FIG. 8 is a cross-sectional view of a connecting portion of a second modification example according to the embodiment of the present invention. FIG. 9 is a diagram illustrating a connecting portion of a blower according to a third modification of the embodiment of the present invention. FIG. 10 is a perspective view of the stator unit. FIG. 10 is a perspective view of the stator unit. FIG. 11 is a diagram illustrating a connection portion of a blower of a fourth modification according to the embodiment of the present invention. FIG. 12 is a diagram illustrating a connecting portion of a blower according to a fifth modification of the embodiment of the present invention. FIG. 13 is a diagram illustrating a connecting portion of a blower according to a sixth modification of the embodiment of the present invention. FIG. 14 illustrates a hair dryer, which is an example of an application example of the blower according to the present invention, with reference to the drawings.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In this document, the direction in which the center axis of the blower extends is simply referred to as “axial direction”, the direction perpendicular to the center axis with respect to the center axis of the blower is simply referred to as “radial direction”, and the center axis of the blower is centered. The direction along the arc is simply referred to as the “circumferential direction”. In the drawings, the radial direction is denoted by Dd and the circumferential direction is denoted by Rd as necessary.

In this document, for convenience of description, the axial direction is defined as the up-down direction, and the up-down direction in FIG. The “upper side” of the blower is the “intake side”, and the “lower side” is the “exhaust side”. Note that the definition of the up-down direction does not limit the direction and the positional relationship when the blower is used. In this document, a cross section parallel to the axial direction is referred to as a “longitudinal cross section”, a cross section perpendicular to the axial direction is referred to as a “transverse cross section”, and an end face of the cut portion perpendicular to the axial direction is referred to as a “lateral end face”.

<1. Overall configuration of blower>
FIG. 1 is a longitudinal sectional view of the blower according to the present embodiment. FIG. 2 is a partial sectional perspective view of the blower shown in FIG. FIG. 3 is a cross-sectional perspective view of the blower according to the present embodiment. FIG. 4 is a cross-sectional view of the blower according to the present embodiment. FIG. 5 is an enlarged view of a connecting portion of the blower according to the present embodiment. FIG. 6 is a perspective view of the stator unit. The blower A includes a rotor unit 1, a stator unit 2, a bearing holding unit 3, a wind tunnel unit 4, and a connecting unit 5.

<1.1 Rotor unit 1>
As shown in FIG. 1, the rotor unit 1 is disposed radially inside the stator unit 2. The rotor unit 1 is rotatably arranged around a central axis C extending vertically. That is, the rotor unit 1 is rotatable around the central axis C. The rotor unit 1 includes a shaft 11, a magnet 12, and an impeller 13.

<1.1.1 Shaft 11>
The shaft 11 has a columnar shape. The shaft 11 is arranged along the central axis C. The shaft 11 is rotatably supported by the bearing holding unit 3 by bearings 31 and 32 described later.

<1.1.2 Magnet 12>
The magnet 12 has a cylindrical shape. The magnet 12 is fixed directly or indirectly to the shaft 11 inserted inside. The magnet 12 is arranged radially inward of a stator core 6 described later of the stator unit 2. The magnet 12 faces the stator core 6 with a gap in the radial direction in the radial direction. The fixing of the magnet 12 and the shaft 11 is performed by press-fitting and bonding. However, the present invention is not limited to this, and a fixing method capable of firmly fixing the magnet 12 to the shaft 11 can be widely used. As shown in FIG. 1, the magnet 12 is fixed to a lower end of the shaft 11.

<1.1.3 Impeller 13>
The impeller 13 is arranged radially inward of the wind tunnel portion 4. The impeller 13 is arranged above the rotor unit 1 and the stator unit 2. The impeller 13 is fixed directly or indirectly to the shaft 11. As shown in FIG. 1, the impeller 13 is fixed to an upper end of the shaft 11. The impeller 13 is rotated around a central axis C extending vertically by the rotation of the rotor unit 1. The impeller 13 includes a plurality of rotor blades 131 arranged at equal intervals in the circumferential direction. That is, the rotor unit 1 has the impeller 13 including the plurality of rotor blades 131 and the magnet 12. The impeller 13 rotates around the central axis C, so that an airflow is generated from above in the axial direction to below.

<1.2 Stator unit 2>
Stator unit 2 is arranged inside wind tunnel section 4. The stator unit 2 is arranged radially outside the rotor unit 1. More specifically, the stator unit 2 is disposed radially outside the magnet 12. The stator unit 2 includes a stator core 6, an insulator 7, and a coil 21.

<1.2.1 Stator core 6>
Stator core 6 is annular with center axis C as the center. The stator core 6 is formed by vertically stacking a plurality of electromagnetic steel sheets such as silicon steel sheets. The stator core 6 includes a core back 61 and a plurality (here, six) of teeth 62. The core back 61 is annular with the center axis C as the center. The plurality of teeth 62 protrude from the core back 61 in the radial direction. The plurality of teeth 62 are arranged at equal intervals in the circumferential direction. That is, the stator core 6 includes an annular core back 61 and a plurality of teeth 62 projecting radially inward from the core back 61 and arranged at intervals in the circumferential direction.

<1.2.2 Coil 21>
The coil 21 is configured by a conductor wound around each tooth 62 of the stator core 6 via the insulator 7.

<1.2.3 Insulator 7>
The insulator 7 is arranged around the stator core 6. The insulator 7 covers at least a part of the stator core 6. The insulator 7 covers the upper and lower surfaces of the core back 61 and the teeth 62. More specifically, an inner peripheral portion of the teeth 62 and a region facing the magnet 12 of the rotor unit 1 and an outer peripheral surface of the core back 61 are exposed to the outside from the insulator 7. That is, the radially outer surface of the stator core 6 is exposed outside the insulator 7. Note that, as shown in FIG. 1 and the like, the core back 61 protrudes radially outward from the insulator 7. Therefore, heat generated in the stator core 6 can be released to the outside via the core back 61. Thereby, a decrease in efficiency due to heat can be suppressed.

  The insulator 7 is disposed between the stator core 6 and the coil 21. The insulator 7 is divided into the same number as the plurality of teeth 62 in the circumferential direction, and is individually arranged for the plurality of teeth 62. The insulator 7 is a member having an insulating property such as a synthetic resin.

  Further, the insulator 7 includes an upper insulator 71 and a lower insulator 72. The upper insulator 71 covers the upper side of the core back 61 and the teeth 62. The lower insulator 72 covers the lower side of the core back 61 and the teeth 62. The lower end of the upper insulator 71 contacts the upper end of the lower insulator 72.

  The stator unit 2 can be divided into, for example, six. Although the number of divisions is six in the present embodiment, the number is not limited to six and may be another number. The stator units 2 are arranged in the circumferential direction. The stator core 6 and the insulator 7 are also divided by the same number as that of the stator unit 2.

  As shown in FIG. 6, the upper insulator 71 and the lower insulator 72 are provided for each of the divided stator units 2. However, the present invention is not limited to this, and the upper insulator 71 and the lower insulator 72 may be integrally formed.

  The coil 21 is formed by winding a conductive wire around a tooth 62 covered with the insulator 7. The insulator 7 has an insulating property, and insulates the coil 21 from the teeth 62. By supplying electricity (current) to the conductive wire constituting the coil 21, the coil 21 and the teeth 62 around which the coil 21 is wound are excited. In the blower device A, the excited teeth 62 and the magnet 12 attract or repel by magnetic force, so that the rotor unit 1 rotates. That is, the rotor unit 1 and the stator unit 2 constitute a so-called motor.

<1.3 Bearing holding part 3>
The bearing holder 3 is arranged above the stator unit. The bearing holding part 3 holds the bearings 31 and 32 inside with a gap vertically. As the bearings 31 and 32, for example, ball bearings can be used. However, it is not limited to this. The bearings 31 and 32 may be constituted by a sleeve bearing or the like. The configuration of the bearings 31 and 32 is determined in consideration of the number of rotations of the shaft 11, the rotation torque, the rotation accuracy, the attachment of the blower A, the maintenance, and the like. By arranging the bearings 31 and 32 vertically, that is, with a gap in the axial direction, the shaft 11 is less likely to swing or vibrate during rotation. The rotation accuracy of the shaft 11 can be improved. Further, the magnet 12 is arranged below the bearing holder 3, and the impeller 13 is arranged above the bearing holder 3.

  In addition, a contact portion 33 that contacts the stator unit 2 is provided at a lower end portion of the bearing holding portion 3. The contact portion 33 has a cylindrical shape, and has an outer shape larger than the outer shape of the upper insulator 71. And the upper end part of the contact part 33 is provided with the flange part 34 extended inward. The upper insulator 71 is arranged inside the contact portion 33. Then, the upper surface of the upper insulator 71 contacts the flange portion 34. That is, the end face on one axial side of the stator unit 2 is covered with the bearing holding portion 3. This can prevent foreign substances such as dust and dirt from entering the rotor unit 1. Therefore, the operation of the rotor unit 1 is less likely to be unstable, and a stable blowing operation can be performed for a long period of time.

<1.4 Wind tunnel section 4>
The wind tunnel portion 4 is arranged radially outside the impeller 13 and the stator unit 2. That is, the blower A further includes the cylindrical wind tunnel portion 4 facing the outside of the outer surface of the stator core 6 in the radial direction with a gap therebetween. The gap between the inner wall surface of the wind tunnel portion 4 and the outer wall surface of the stator unit 2 and the outer wall surface of the bearing holding portion 3 is a flow path FW. The wind tunnel portion 4 has a circular cross section perpendicular to the axial direction. A plurality of ribs 41 are provided inside the wind tunnel portion 4. The rib 41 is arranged between the wind tunnel section 4 and the bearing holding section 3. The rib 41 connects the inner peripheral surface of the wind tunnel portion 4 and the outer peripheral surface of the bearing holding portion 3. That is, the rib 41 is arranged inside the flow path FW. The rib 41 extends downward in the axial direction. A radially outer end of the rib 41 is connected to a portion of the wind tunnel portion 4 which radially faces the stator unit 2. With the provision of the wind tunnel portion 4, a flow of air flowing around the stator unit 2 can be created, and the stator core 6 can be effectively cooled.

  In the present embodiment, the bearing holding section 3, the wind tunnel section 4, the rib 41, and the bearing holding section 3 are formed of the same member, but may be formed of separate members independent of each other. The plurality of ribs 41 are arranged at predetermined intervals in the circumferential direction, and each extend in the up-down direction. The lower part of the rib 41 curves forward with respect to the upper part of the rib 41 in the rotation direction of the impeller 13.

  Further, the blower A can form a flow path FW between the wind tunnel section 4 and the stator unit 2. The core back 61 of the stator unit 2 is exposed to the flow path FW. That is, the radially outer surface of the stator core 6 is exposed to the outside of the insulator 7, so that the cooling action of the stator unit 2 can be improved. Further, since the rib 41 connecting the connecting portion 5 and the wind tunnel portion 4 has a stationary blade shape, rectification of the airflow flowing through the flow path FW between the wind tunnel portion 4, the stator unit 2 and the bearing holding portion 3 is performed. Will be possible.

<1.5 Connecting part 5>
The connecting portion 5 fixes an axially upper end of the stator unit 2 and an axially lower end of the bearing holding portion 3. That is, the blower A includes the connecting portion 5 for fixing the axial end of the stator unit 2 to the axial end of the bearing holder 3.

  As shown in FIG. 4, the blower A includes six connecting portions 5. When viewed from the axial direction, the six connecting portions 5 are arranged at equal intervals in the circumferential direction. That is, a plurality of connecting portions 5 are arranged in the circumferential direction. By arranging a plurality of connecting portions 5, the fixing between the stator unit 2 and the bearing holding portion 3 can be further strengthened. Since the connecting portions 5 are arranged at equal intervals, the stator unit 2 and the bearing holding portion 3 are stably fixed. Note that the intervals need not be equal.

  When viewed from the axial direction, each connecting portion 5 is disposed between adjacent teeth 62. That is, when viewed from the axial direction, the connecting portion 5 is disposed between the teeth 62 adjacent in the circumferential direction. Thereby, the shape of the molding die of the insulator 7 can be simplified. Therefore, manufacture of insulator 7 becomes easy. Further, it is difficult to hinder the winding operation when configuring the coil 21, and the workability is improved.

  And the connection part 5 is provided with the hook part 51 and the pinching part 52. The hook portion 51 is provided on the insulator 7, and the holding portion 52 is provided on the bearing holding portion 3. That is, the connecting portion 5 includes the hook portion 51 provided on the insulator 7 and the holding portion 52 provided on the bearing holding portion 3. Thereby, the hook portion 51 can be formed at the same time when the insulator 7 is formed. Further, by combining the hook portion 51 with the sandwiching portion 52, the stator unit 2 and the bearing holding portion 3 can be fixed, so that assembly is easy.

  Preferably, the connecting portion 5 is provided radially inward of the outer surface of the stator core 6. Since the connecting portion 5 is disposed radially inward of the outer surface of the stator core 6, the airflow caused by the rotation of the impeller 13 effectively contacts the stator core. Therefore, the cooling effect of stator core 6 is enhanced. When the stator core 6 can be sufficiently cooled by the airflow, the connecting portion 5 may be disposed radially outside the outer surface of the stator core 6.

<1.5.1 Hook part 51>
As shown in FIGS. 5 and 6, the hook portion 51 extends upward from the upper surface of the upper insulator 71 of the insulator 7. The hook portion 51 is formed integrally with the upper insulator 71. As shown in FIGS. 5 and 6, the hook portion 51 includes an extension portion 511 and a fixing portion 512.

  The extending portion 511 extends upward from the upper surface of the upper insulator 71. The fixing portion 512 extends in the circumferential direction from the upper end of the extending portion 511. The fixing portion 512 has a fixing surface 513 at the lower end in the axial direction. That is, the hook portion 51 extends from one end in the axial direction of the insulator 7 to one side in the axial direction, and extends from the tip of the extension portion 511 in a direction intersecting the extension portion 511 and to the other side in the axial direction. And a fixing portion 512 having a fixing surface 513 facing the fixing portion 512.

  The fixing portion 512 protrudes, for example, in the direction opposite to the rotation direction of the rotor unit 1. Thereby, even when the reaction force due to the rotation of the rotor unit 1 acts on the stator unit 2, the fixing between the stator unit 2 and the bearing holding unit 3 by the connecting portion 5 is maintained.

<1.5.2 Nipping part 52>
The holding portion 52 is formed on the flange portion 34 of the bearing holding portion 3. The flange portion 34 is provided with six sandwich portions 52. The six sandwich portions 52 are arranged at equal intervals in the circumferential direction. The holding portion 52 includes an insertion portion 521 and a contact portion 522. And the insertion part 521 is a through-hole which penetrates the flange part 34 in an axial direction. When viewed in the axial direction, the insertion portion 521 extends along an arc centered on the central axis, that is, in the circumferential direction.

  The circumferential length of the insertion portion 521 is equal to or longer than the circumferential length when the hook portion 51 is viewed from the axial direction. Therefore, the hook portion 51 can be inserted into the insertion portion 521 by arranging the hook portion 51 and the insertion portion 521 so as to overlap each other in the axial direction. The radial width of the insertion portion 521 is narrow on the rear side in the rotation direction of the rotor unit 1 in the circumferential direction. Preferably, the insertion portion 521 and the hook portion 51 are curved in the circumferential direction about the center axis C.

  The contact portion 522 is formed on the upper surface of the flange portion 34. The contact portion 522 is provided with a contact surface 523 at a portion adjacent to the insertion portion 521 on the upper surface of the flange portion 34, where the fixing surface 513 of the fixing portion 512 of the hook portion 51 contacts. That is, the sandwiching portion 52 is formed with an insertion portion 521 into which the hook portion 51 is inserted, and a contact surface 523 facing the one side in the axial direction and contacting the fixing surface 513 of the fixing portion 512 inserted into the insertion portion 521. Contact portion 522.

  As shown in FIG. 5, the extending portion 511 of the hook portion 51 has the same length as the length of the insertion portion 521 in the axial direction. Therefore, when the hook portion 51 is inserted into the insertion portion 521, the fixing surface 513, the contact surface 523, and the axial position overlap.

<1.5.3 Fixing by connecting part 5>
A method of fixing the stator unit 2 and the bearing holding unit 3 by the connecting unit 5 will be described. First, the stator unit 2 and the bearing holding portion 3 are arranged such that the six hook portions 51 and the six holding portions 52 are respectively overlapped in the axial direction. Then, the six hook portions 51 are inserted into each of the six insertion portions 521. At this time, the fixing portion 512 of the hook portion 51 projects above the flange portion 34. Then, by rotating the stator unit 2 in the direction opposite to the rotation direction of the rotor unit 1, the fixed surface 513 of the fixed portion 512 comes into contact with the contact surface 523 of the contact portion 522.

  The stator unit 2 is fixed to the bearing holder 3 in the axial direction. Further, the radial width of the insertion portion 521 is narrow on the rear side in the rotation direction of the rotor unit 1 in the circumferential direction. Therefore, the extension portion 511 is sandwiched between the insertion portion 521 and the hook portion 51. As a result, the hook portion 51 and the sandwiching portion 52 are fixed, and the upper insulator 71 and the bearing holding portion 3 are fixed. That is, the connecting portion 5 fixes the end of the insulator 7 on one side in the axial direction and the end of the bearing holding portion 3 on the other side in the axial direction. Further, the insulator 7 is included in the stator unit 2. The stator unit 2 and the bearing holder 3 are fixed. Therefore, blower A is provided with connecting portion 5 for fixing an end of stator unit 2 on one axial side and an end of bearing holding unit 3 on the other axial side. Therefore, the stator unit 2 can be held without a member that holds the outside of the stator unit 2 in the radial direction. Thereby, a part of the stator core 6 is exposed to the outside of the insulator 7, so that the cooling efficiency of the stator unit 2 is increased.

  As described above, the stator unit 2 and the bearing holding unit 3 are fixed by the connecting unit 5. That is, the stator unit 2 is fixed to the wind tunnel portion 4 by the connecting portion 5. The hook portion 51 is formed integrally with the insulator 7 of the stator unit 2, and the holding portion 52 is formed on the flange portion 34 of the bearing holding portion 3 to fix the stator unit 2 to the wind tunnel portion 4. No fixing member is required.

  Therefore, in the blower A, the number of components can be reduced. Thereby, the cost required for manufacturing can be reduced, and the weight can be reduced. Further, since the assembly is performed by inserting the hook portion 51 into the holding portion 52 and rotating the stator unit 2 around the central axis C, the assembly of the blower A is easy.

  In the blower A having the above configuration, when a drive current is supplied to the coil 21, a radial magnetic flux is generated in the teeth 62. The magnetic field generated by the magnetic flux of the stator unit 2 and the magnetic field generated by the magnet 12 act to generate torque in the rotor unit 1. This torque causes the rotor unit 1 and the impeller 13 to rotate about the central axis C. When the impeller 13 rotates, an airflow is generated by the plurality of rotor blades 131. That is, in the air blower A, the air can be blown by generating an airflow in which the upper side is the intake side and the lower side is the exhaust side. The airflow generated by the blower A passes between the wind tunnel section 4 and the stator unit 2.

  In the blower A, the radially outer surface of the core back 61 of the stator unit 2 is exposed outside the insulator 7.

  According to the blower A of the present embodiment, the radially outer surface of the core back 61 of the stator unit 2 is exposed outside the insulator 7. The core back 61 is cooled by the airflow generated by the rotation of the impeller 13. Thereby, cooling of the coil 21 wound around the teeth 62 extending from the core back 61 is also possible. That is, the stator unit 2 can be efficiently cooled by the airflow.

  From the above, in the blower A of the present embodiment, a cover that covers the outer shape of the stator unit 2 is not required, and the outer surface of the stator core 6 can be exposed to the outer surface of the insulator 7. Thereby, the cooling efficiency of the stator unit 2 can be increased. Therefore, a large amount of current can flow through the coil 21. Thereby, it is possible to reduce the size of the blower A without reducing the amount of blown air. The radial gap between the stator unit 2 and the wind tunnel 4 can be increased by removing the cover that covers the outside in the radial direction without changing the size of the stator unit 2. Thereby, the amount of air flowing inside the blower A, that is, the discharge amount can be increased.

<2. First Modification of Blower>
FIG. 7 is a cross-sectional view of a connecting portion according to a first modification of the embodiment of the present invention. Note that the blower of this modification is the same as the embodiment except for the configuration of the connecting portion 5b. Therefore, in this modification, detailed description other than the connecting portion 5b is omitted. As shown in FIG. 7, the connecting portion 5b includes a hook portion 51b and a sandwiching portion 52b. The number of the connecting parts 5b is the same as that of the connecting parts 5, that is, six.

<2.1 Hook part 51b>
The hook portion 51b includes an extending portion 511b and a fixing portion 512b. The extending portion 511b protrudes upward from the upper surface of the upper insulator 71. The extending portion 511b has a plate shape extending in the axial direction, the longitudinal direction is along the axial direction, and the short direction is along the circumferential direction. That is, when viewed from the radial direction, the extending portion 511b has a rectangular shape having a long side in the axial direction. The lower end of the extension 511b is elastically displaceable in the radial direction. That is, the extending portion 511b is elastically deformable in the radial direction.

  The fixing portion 512b protrudes radially outward from the upper end of the extension portion 511b. The fixing portion 512b includes a fixing surface 513b and an inclined surface 514b. The fixing surface 513b is a lower surface of the fixing portion 512b. The fixed surface 513b is a surface orthogonal to the central axis C. The inclined surface 514b expands radially downward from the upper end. Then, the lower end of the inclined surface 514b is connected to the radial outer edge of the fixed surface 513b. That is, the fixing portion 512b has a wedge shape that becomes thinner radially upward. That is, the hook portion 51b is a so-called snap fit. That is, the extending portion 511b is elastically deformable in the radial direction. Since the extending portion 511b is elastically deformed, the stator unit 2 can be fixed to the bearing holding portion 3 only by approaching in the axial direction. Thereby, assembly is easy.

<2.2 Pinching part 52b>
The holding portion 52b is formed on the flange portion 34 of the bearing holding portion 3. The holding portion 52b includes an insertion portion 521b and a contact portion 522b. And the insertion part 521b is a through-hole which penetrates the flange part 34 in an axial direction. The circumferential length of the insertion portion 521b is equal to or longer than the circumferential length of the extending portion 511b when viewed from the axial direction. The radial width of the insertion portion 521b is equal to or larger than the radial width of the hook portion 51b when viewed from the axial direction.

  The contact portion 522b is formed on the upper surface of the flange portion 34. The contact portion 522b includes a contact surface 523b at a portion adjacent to the insertion portion 521b on the upper surface of the flange portion 34, where the fixing surface 513b of the fixing portion 512b of the hook portion 51b contacts.

<2.3 Fixing by connecting part 5b>
A method of fixing the stator unit 2 and the bearing holder 3 by the connecting portion 5b will be described. First, the stator unit 2 and the bearing holding portion 3 are arranged so that the six hook portions 51b and the six holding portions 52b are respectively overlapped in the axial direction. When viewed from the axial direction, a part of the inclined surface 514b of the hook portion 51b is located radially outside of the sandwiching portion 52b. In this state, the stator unit 2 is moved downward in the axial direction. The inclined surface 514b is in contact with the edge of the insertion portion 521b on the lower surface of the flange portion 34.

  By moving the stator unit 2 upward in the axial direction in this state, the inclined surface 514b is pressed against the inner surface of the insertion portion 521b. Thereby, the extending portion 511b is elastically deformed in the radial direction. When the fixing portion 512b moves above the upper surface of the flange portion 34, the force acting on the fixing portion 512b from the insertion portion 521b is released. Therefore, the elastically deformed extending portion 511b returns to its original state. The fixing surface 513b of the fixing portion 512b contacts the contact surface 523b of the sandwiching portion 52b in the axial direction. Thereby, it is possible to prevent the stator unit 2 and the bearing holder 3 from separating in the axial direction. Further, since the extending portion 511b is inserted into the insertion portion 521b, the relative movement of the stator unit 2 and the bearing holding portion 3 in the circumferential direction is restricted. That is, the stator unit 2 and the bearing holding part 3 are fixed by the connecting part 5b.

  In addition, in the first modification, the insertion portion 521b is a through hole, but is not limited thereto. For example, a concave portion that is concave in the radial direction may be used. Further, a concave portion formed on the outer surface or inner surface of the upper end portion of the bearing holding portion 3 and concaved in the radial direction may be used. In this case, when the stator unit 2 is moved in the axial direction, the extending portion 511b is elastically deformed by the upper end of the bearing holding portion 3. Then, when the fixed portion 512b is moved by a certain amount in the axial direction, the fixed portion 512b is inserted into the insertion portion. Thus, the connecting portion 5b fixes the stator unit 2 and the bearing holding portion 3 to each other.

  In this modification, the fixing portion 512b projects radially outward, but is not limited to this. For example, it may project radially inward. In this case, the fixing surface 513b is brought into contact with the contact surface 523b formed on the radially inner peripheral portion of the insertion portion 521b, and is fixed.

<3. Second modification of blower>
FIG. 8 is a cross-sectional view of a connecting portion of a second modification example according to the embodiment of the present invention. Note that the blower of this modification is the same as the embodiment except for the configuration of the connecting portion 5c. Therefore, in this modified example, detailed description other than the connecting portion 5c is omitted. As shown in FIG. 8, the connecting portion 5c includes a hook portion 51c and a sandwiching portion 52c.

<3.1 Hook part 51c>
The hook part 51c includes an extension part 511c and a fixing part 512c. The extending portion 511c protrudes upward from the upper surface of the upper insulator 71. The extending portion 511c has a plate shape extending in the axial direction, the longitudinal direction is along the axial direction, and the short direction is along the radial direction. That is, when viewed from the circumferential direction, the extending portion 511c has a rectangular shape having a long side in the axial direction. The extension 511c has an upper end that is elastically displaceable in the circumferential direction.

  The fixing portion 512c protrudes radially outward from the upper end of the extending portion 511c. The fixing portion 512c includes a fixing surface 513c and an inclined surface 514c. The fixing surface 513c is a lower surface of the fixing portion 512c. The fixed surface 513c is a surface orthogonal to the central axis C. The inclined surface 514c expands radially downward from the upper end. Then, the lower end of the inclined surface 514c is connected to the radial outer edge of the fixed surface 513c. That is, the fixing portion 512c has a wedge shape that becomes thinner radially upward. That is, the hook portion 51c is a so-called snap fit. That is, the extending portion 511c is elastically deformable in the circumferential direction. Since the extending portion 511c is elastically deformed, the stator unit 2 can be fixed to the bearing holding portion 3 only by approaching in the axial direction. Thereby, assembly is easy.

<3.2 pinching portion 52c>
The holding portion 52c is formed on the flange portion 34 of the bearing holding portion 3. The holding portion 52c includes an insertion portion 521c and a contact portion 522c. And the insertion part 521c is a through-hole which penetrates the flange part 34 in an axial direction. The radial length of the insertion portion 521c is equal to or longer than the radial length when the extending portion 511c is viewed from the axial direction. The radial width of the insertion portion 521c is equal to or larger than the radial width of the hook portion 51c when viewed from the axial direction.

  The contact portion 522c is formed on the upper surface of the flange portion 34. The contact portion 522c has a contact surface 523c at a portion adjacent to the insertion portion 521c on the upper surface of the flange portion 34, where the fixing surface 513c of the fixing portion 512b of the hook portion 51c contacts.

  The fixing between the stator unit 2 and the bearing holding portion 3 by the connecting portion 5c is the same as the fixing between the stator unit 2 and the bearing holding portion 3 by the connecting portion 5b, except that the extension portion 511c is elastically deformed in the circumferential direction. is there.

  As shown in the first modified example and the second modified example, since the extending portions 511b and 511c are elastically deformed, the assembly of the blower A is easy.

<4. Third modification of blower>
FIG. 9 is a diagram illustrating a connecting portion of a blower according to a third modification of the embodiment of the present invention. FIG. 10 is a perspective view of the stator unit. The present modified example has the same configuration as the insulator 7 and the connection portion 5 of the stator unit 2 of the embodiment except for the configuration of the insulator 7d and the connection portion 5d of the stator unit 2d. Therefore, in this modified example, detailed description other than the insulator 7d and the connecting portion 5d is omitted. As shown in FIG. 9, the connecting portion 5d according to the third modified example includes a hook portion 51d and a sandwiching portion 52d. The hook portion 51d is provided on the bearing holding portion 3, and the holding portion 52d is provided on the insulator 7d. That is, the connecting portion 5 d includes a sandwiching portion 52 d provided on the insulator 7 and a hook portion 51 d provided on the bearing holding portion 3. By combining the hook portion 51d with the sandwiching portion 52d, the stator unit 2 and the bearing holding portion 3 can be fixed. Therefore, assembly is easy.

  At the upper end of the upper insulator 71d, there is provided a beam-shaped portion 711 connected in the radial direction. The beam-shaped portion 711 is provided at the upper end of the upper insulator 71d and has a plate shape extending in the radial direction. And six beam-shaped parts 711 are provided, and are arranged between adjacent teeth 62.

<4.1 Hook 51d>
As shown in FIG. 9, the hook portion 51d is provided on the lower surface of the bearing holding portion 3. The hook portion 51d extends downward in the axial direction. The hook 51d is formed integrally with the bearing holder 3. As shown in FIG. 9, the hook portion 51d includes an extending portion 511d and a fixing portion 512d.

  The extending portion 511d extends downward from the lower surface of the bearing holding portion 3. The fixing portion 512d extends in the circumferential direction from the lower end of the extending portion 511d. The fixing portion 512d has a fixing surface 513d at the upper end in the axial direction. The fixing portion 512 protrudes, for example, in the direction opposite to the rotation direction of the rotor unit 1. Thereby, even when the reaction force due to the rotation of the rotor unit 1 acts on the stator unit 2, the fixing of the stator unit 2 and the bearing holding unit 3 by the connecting portion 5d is maintained. That is, the hook portion 51d extends from the end of the bearing holding portion 3 on the other side in the axial direction to the other side in the axial direction, and extends from the tip end of the extension portion 511d in a direction intersecting with the extension portion 511d and extends in the axial direction. And a fixing portion 512d formed with a fixing surface 513d facing the side.

<4.2 sandwiching part 52d>
The sandwiching portion 52d is provided on the upper insulator 71d. The beam-shaped portion 711 of the upper insulator 71d is provided with six sandwiching portions 52d. The six sandwiching portions 52d are arranged at equal intervals in the circumferential direction. The holding portion 52d includes an insertion portion 521d and a contact portion 522d. And the insertion part 521d is a through-hole which penetrates a part of upper insulator 71d in the axial direction. In the insertion portion 521d, the circumferential length of the insertion portion 521d is equal to or longer than the circumferential length of the hook portion 51d when viewed from the axial direction. Therefore, by arranging the hook portion 51d and the insertion portion 521d so as to overlap in the axial direction, the hook portion 51d can be inserted into the insertion portion 521d. The radial width of the insertion portion 521d is narrow on the rear side in the rotation direction of the rotor unit 1 in the circumferential direction. Preferably, the insertion portion 521d and the hook portion 51d are curved in the circumferential direction about the central axis C.

  The contact portion 522d is formed on the lower surface of the beam portion 711. The contact portion 522d has a contact surface 523d on the lower surface of the beam portion 711 adjacent to the insertion portion 521d, with which the fixing surface 513d of the fixing portion 512d of the hook portion 51d contacts. That is, the sandwiching portion 52d has an insertion portion 521d into which the hook portion 51d is inserted, and a contact surface 523d facing the other side in the axial direction and contacting the fixing surface 513d of the fixing portion 512d inserted into the insertion portion 521d. 522d.

  The fixing of the stator unit 2 and the bearing holding part 3 by the connecting part 5 d is the same as the fixing of the stator unit 2 and the bearing holding part 3 by the connecting part 5. That is, the hook portion 51d is inserted into the sandwiching portion 52d, and the stator unit 2 is rotated around the central axis C in a direction opposite to the rotation direction R1 of the rotor unit 1. Thereby, the stator unit 2 and the bearing holder 3 can be fixed.

<5. Fourth modification of blower>
FIG. 11 is a diagram illustrating a connection portion of a blower of a fourth modification according to the embodiment of the present invention. The connecting portion 5e of the present modification has the same configuration as the connecting portion 5d of the third embodiment, except that a sandwiching portion 52e is provided on the stator core 6. Therefore, in this modified example, detailed description other than the connecting portion 5e is omitted. As shown in FIG. 11, the connecting portion 5e in the fourth modification includes a hook portion 51d and a sandwiching portion 52e. The hook portion 51d is provided on the bearing holding portion 3, and the holding portion 52d is provided on the insulator 7. That is, the connecting portion 5 e includes a sandwiching portion 52 e provided on the stator core 6 and a hook portion 51 d provided on the bearing holding portion 3. The hook portion 51d can be formed at the same time when the bearing holding portion 3 is formed.

<5.1 Nipping part 52e>
The sandwiching portion 52e is formed on the stator core 6. The core back 61 of the stator core 6 is provided with six sandwiching portions 52e. The six sandwiching portions 52e are arranged at equal intervals in the circumferential direction. The sandwiching portion 52e includes an insertion portion 521e and a contact portion 522e. The insertion portion 521 e is a concave portion that is recessed axially downward from the upper surface of the core back 61. The contact portion 522e has a lateral hole shape extending in the circumferential direction from the innermost portion of the concave portion of the insertion portion 521e, that is, from the lower end in the axial direction. On the upper surface of the contact portion 522e, a contact surface 523e that comes into contact with the fixing surface 513d of the hook 51d is provided.

  The circumferential length of the insertion portion 521e is equal to or longer than the circumferential length of the hook portion 51e when viewed from the axial direction. Therefore, the hook portion 51d can be inserted into the insertion portion 521e by arranging the hook portion 51d and the insertion portion 521e so as to overlap each other in the axial direction. The radial width of the insertion portion 521e is narrow on the rear side in the rotation direction of the rotor unit 1 in the circumferential direction. Preferably, the insertion portion 521e and the hook portion 51d are curved in the circumferential direction about the central axis C.

  That is, the sandwiching portion 52d is formed with an insertion portion 521e into which the hook portion 51d is inserted, and a contact surface 523e facing the other side in the axial direction and contacting the fixing surface 513d of the fixing portion 512d inserted into the insertion portion 521e. Contact portion 522e. Further, by combining the hook portion with the sandwiching portion, the stator unit and the bearing holding portion can be fixed, so that assembly is easy.

  The stator core 6 according to the present modification is a laminated body in which a plurality of electromagnetic steel sheets are arranged side by side in the axial direction. Then, a through-hole or a concave portion constituting the sandwiching portion 52e is provided in the electromagnetic steel sheet constituting each layer, and the sandwiching portion 52e is formed by stacking. For example, when the stator core 6 is used, it is difficult to form the sandwiching portion 52e inside. Therefore, when the integrally formed stator core 6 is used, the holding portion 52e may have a shape that opens on the radially outer surface or the radially inner surface of the stator core 6. With such a configuration, since the processing can be performed from the radial outer surface or the radial inner surface of the stator core 6, the sandwiching portion 52e can be easily manufactured.

  The fixing of the stator unit 2 and the bearing holding part 3 by the connecting part 5 d is the same as the fixing of the stator unit 2 and the bearing holding part 3 by the connecting part 5. That is, the hook portion 51d is inserted into the sandwiching portion 52e, and the stator unit 2 is rotated around the central axis C in a direction opposite to the rotation direction R1 of the rotor unit 1. Thereby, the stator unit 2 and the bearing holder 3 can be fixed.

<6. Fifth Modified Example of Blower>
FIG. 12 is a diagram illustrating a connecting portion of a blower according to a fifth modification of the embodiment of the present invention. The connecting portion 5e2 of this modified example has the same configuration as the connecting portion 5e of the fourth modified example, except that the hook portion 51e is provided on the stator core 6. Therefore, in this modified example, detailed description other than the connecting portion 5e2 is omitted. As shown in FIG. 11, the connecting portion 5e2 in the fifth modification includes a hook portion 51e and a sandwiching portion 52e. The hook portion 51e is provided on the bearing holding portion 3, and the holding portion 52d is provided on the insulator 7.

<6.1 Hook 51e>
The hook part 51e includes an extending part 511e and a fixing part 512e. The extending portion 511e extends downward from the lower surface of the bearing holding portion 3. The extending portion 511e has a plate shape extending in the axial direction, the longitudinal direction is along the axial direction, and the short direction is along the circumferential direction. That is, when viewed from the radial direction, the extending portion 511e has a rectangular shape having a long side in the axial direction. The extension 511e has an upper end that is elastically displaceable in the radial direction.

  The fixing portion 512e protrudes radially outward from the upper end of the extension portion 511e. The fixing portion 512e includes a fixing surface 513e and an inclined surface 514e. The fixing surface 513e is the upper surface of the fixing portion 512e. The fixed surface 513e is a surface orthogonal to the central axis C. The inclined surface 514e extends radially upward from the lower end. Then, the upper end of the inclined surface 514e is connected to the radial outer edge of the fixed surface 513e. That is, the fixing portion 512e has a wedge shape that becomes thinner radially downward. That is, the hook 51e is a so-called snap fit.

  In addition, in the connection part 5e, the extension part 511e is connected to the pinching part 52e by being elastically deformed. As a result, the stator unit 2 and the bearing holder 3 are fixed. Note that the deformation of the extending portion 511e is the same as 5b of the first modification.

  Other configurations are the same as those of the fourth modification.

<7. Sixth Modified Example of Blower>
FIG. 13 is a diagram illustrating a connecting portion of a blower according to a sixth modification of the embodiment of the present invention. The connecting portion 5f of the present modified example has the same configuration as the connecting portion 5e2 of the third embodiment, except that a sandwiching portion 52f is provided on the stator core 6. Therefore, in this modified example, detailed description other than the connecting portion 5f is omitted. As shown in FIG. 13, the connecting portion 5f in the sixth modification includes a hook portion 51e and a sandwiching portion 52f. The hook portion 51e is provided on the bearing holding portion 3, and the holding portion 52f is provided on the insulator 7.

<7.1 Hook part 51f>
The hook portion 51f includes an extending portion 511f and a fixing portion 512f. The extending portion 511f extends downward from the lower surface of the bearing holding portion 3. The extending portion 511f has a plate shape extending in the axial direction, the longitudinal direction is along the axial direction, and the short direction is along the radial direction. That is, when viewed from the circumferential direction, the extending portion 511f has a rectangular shape having a long side in the axial direction. The extension 511f has an upper end that is elastically displaceable in the radial direction.

  The fixing portion 512f protrudes in the circumferential direction from the upper end of the extension portion 511f. The fixing portion 512f includes a fixing surface 513f and an inclined surface 514f. The fixing surface 513f is an upper surface of the fixing portion 512f. The fixed surface 513f is a surface orthogonal to the central axis C. The inclined surface 514f extends circumferentially upward from the lower end. Then, the upper end of the inclined surface 514f is connected to the radial outer edge of the fixed surface 513f. That is, the fixing portion 512f has a wedge shape that becomes thinner in the circumferential direction downward. That is, the hook portion 51f is a so-called snap fit.

<7.2 sandwiching part 52f>
The sandwiching portion 52f is formed on the core back 61 of the stator core 6. The sandwiching portion 52f includes an insertion portion 521f and a contact portion 522f. The insertion portion 521f is a concave portion that is recessed downward from the upper surface of the core back 61. The radial length of the insertion portion 521f is equal to or longer than the radial length of the extending portion 511f when viewed from the axial direction. The circumferential width of the insertion portion 521f is equal to or larger than the circumferential width of the hook portion 51f when viewed from the axial direction. The depth of the insertion portion 521f, that is, the axial length, is equal to or longer than the protrusion length of the hook portion 51f, that is, the axial length.

  The contact portion 522f is a lateral hole provided at the lower end of the insertion portion 521f. The lower surface of the contact portion 522f includes a contact surface 523f with which the fixing surface 513f of the fixing portion 512f of the hook portion 51f contacts.

  In addition, in the connecting portion 5f, the extending portion 511f is elastically deformed to be connected to the sandwiching portion 52f. As a result, the stator unit 2 and the bearing holder 3 are fixed. The deformation of the extending portion 511f is the same as 5c of the second modification.

<8. Usage example>
FIG. 14 illustrates a hair dryer, which is an example of an application example of the blower according to the present invention, with reference to the drawings. FIG. 14 is a cross-sectional view of the hair dryer. The hair dryer Hd illustrated in FIG. 14 includes a main body Hd1, a heater Ht, a handle Hd2, and a blower A. The main body Hd1 has a cylindrical shape. The heater Ht is disposed inside the main body Hd1. The handle portion Hd2 has a cylindrical shape, and has an upper end connected to the main body Hd1. The inside of the main body Hd1 communicates with the inside of the handle Hd2.

  As described above, the blowing device A according to the present invention can be reduced in diameter without reducing the air volume. Therefore, in the hair dryer Hd, the blower A in an upside down state in FIG. 1 is arranged inside the handle portion Hd2. Then, air is taken in from the lower end of the handle portion Hd2, and an airflow that flows upward in the inside is generated. Then, the airflow that has flowed through the handle portion Hd2 flows inside the main body portion Hd1 in the axial direction. At this time, the airflow is heated by the heater Ht disposed inside the main body Hd1, becomes warm air, and is discharged from the discharge portion of the main body Hd1 to the outside.

  By arranging the blower A in the handle Hd2 in this manner, the same airflow as when the blower A is placed on the main body Hd1 can be discharged, and the axial length of the main body Hd1 can be shortened. That is, it is possible to reduce the size of the hair dryer Hd.

<9. Others>
Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention. Also,
The above embodiment and its modified examples can be arbitrarily combined as appropriate.

  Although the embodiment of the present invention has been described above, the embodiment can be variously modified within the scope of the gist of the present invention.

  The blower of the present invention can be used, for example, as an airflow generator of a device using an airflow such as a hair dryer, a ventilation fan, and a vacuum cleaner.

DESCRIPTION OF SYMBOLS 1 Rotor unit 11 Shaft 12 Magnet 13 Impeller 131 Moving blade 2 Stator unit 21 Coil 3 Bearing holding part 31, 32 Bearing 33 Contact part 34 Flange part 4 Wind tunnel part 41 Rib 5 Connecting part 51 Hook part 511 Extension part 512 Fixed part 513 Fixed Surface 52 Nipping portion 521 Inserting portion 522 Contacting portion 523 Contacting surface 5b Connecting portion 51b Hook portion 511b Extension portion 512b Fixed portion 513b Fixed surface 514b Inclined surface 52b Nipping portion 521b Inserting portion 522b Contacting portion 521b Contacting portion 5c 5c Connecting surface 5c Extension portion 512c Fixed portion 513c Fixed surface 514c Inclined surface 52c Nipping portion 521c Insertion portion 522c Contact portion 523c Contact surface 5d Connecting portion 51d Hook portion 511d Extension portion 512d Fixed portion 513d Fixed surface 52d Part 521d Insertion part 522d Contact part 523d Contact surface 5e Connection part 51e Hook part 511e Extension part 512e Fixation part 513e Fixation surface 514e Inclined surface 52e Nipping part 521e Insertion part 522e Contact part 523e Contact part 5f Connection part 5f Connection part 5f Connection part Fixing portion 513f Fixing surface 52f Nipping portion 521f Inserting portion 522f Contact portion 523f Contact surface 5e2 Connecting portion 6 Stator core 61 Core back 62 Teeth 7 Insulator 71 Upper insulator 72 Lower insulator 610 Split core back 711 Beam upper section A Beam section C Center axis Hd Hair dryer Hd1 Main body Hd2 Handle Ht Heater R1 Rotation direction

Claims (14)

A rotor unit having an impeller and a magnet including a plurality of rotor blades and rotatable around a central axis,
A stator unit disposed radially outside the magnet;
A bearing holding portion that holds a bearing that rotatably supports the rotor unit,
The stator unit includes:
A stator core,
An insulator covering a part of the stator core,
The bearing holding portion is located on one axial side of the stator unit,
A blower, comprising: a connecting portion for fixing an axial end of the stator unit to an axial end of the bearing holding portion.   The blower according to claim 1, wherein the connection portion is provided radially inward of an outer surface of the stator core.   The blower according to claim 1 or 2, wherein a plurality of the connecting portions are arranged in a circumferential direction. The stator core includes an annular core back and a plurality of teeth projecting radially inward from the core back and arranged at intervals in a circumferential direction,
The blower according to any one of claims 1 to 3, wherein the connecting portion is disposed between teeth adjacent in the circumferential direction when viewed from the axial direction.   The blower according to any one of claims 1 to 4, wherein the connecting portion fixes an end of the insulator on one side in the axial direction and an end of the bearing holding portion on the other side in the axial direction. The connecting portion includes a hook portion provided on the insulator, and a holding portion provided on the bearing holding portion,
The hook portion,
An extending portion extending to one axial side from one end in the axial direction of the insulator,
A fixing portion extending from the tip of the extending portion in a direction intersecting with the extending portion and having a fixing surface facing the other side in the axial direction,
The sandwiching portion,
An insertion portion into which the hook portion is inserted,
The air blower according to claim 5, further comprising: a contact portion facing one axial side and having a contact surface with which the fixed surface of the fixed portion inserted into the insertion portion comes into contact. The coupling portion includes a clip portion provided on the insulator and a hook portion provided on the bearing holding portion,
The hook portion,
An extending portion extending from the other end in the axial direction to the other end in the axial direction of the bearing holding portion,
A fixing portion extending from the tip of the extending portion in a direction intersecting with the extending portion and having a fixed surface facing one axial side.
The sandwiching portion,
An insertion portion into which the hook portion is inserted,
The air blower according to claim 5, further comprising: a contact portion facing the other side in the axial direction and having a contact surface with which the fixed surface of the fixed portion inserted into the insertion portion comes into contact. The connecting portion includes a sandwiching portion provided on the stator core, and a hook portion provided on the bearing holding portion,
The hook portion,
An extending portion extending from the other end in the axial direction to the other end in the axial direction of the bearing holding portion,
A fixing portion extending from the tip of the extending portion in a direction intersecting with the extending portion and having a fixed surface facing one axial side.
The sandwiching portion,
An insertion portion into which the hook portion is inserted,
The blower according to any one of claims 1 to 4, further comprising: a contact portion facing the other side in the axial direction and having a contact surface with which the fixing surface of the fixing portion inserted into the insertion portion comes into contact. apparatus.   The blower according to any one of claims 6 to 8, wherein the extension portion is elastically deformable in a circumferential direction.   The blower according to any one of claims 6 to 8, wherein the extending portion is elastically deformable in a radial direction.   The blower according to any one of claims 1 to 10, wherein an end surface on one axial side of the stator unit is covered with the bearing holding portion.   The air blower according to any one of claims 1 to 11, further comprising: a cylindrical wind tunnel portion facing a radially outer side of an outer surface of the stator core with a gap therebetween.   The blower according to any one of claims 1 to 12, wherein a radially outer surface of the stator core is exposed outside the insulator. An outer case,
A hair dryer comprising: the blower according to any one of claims 1 to 13, which is disposed inside the outer case.

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