CN110657113A

CN110657113A - Air supply device

Info

Publication number: CN110657113A
Application number: CN201910565192.3A
Authority: CN
Inventors: 石田亮介
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2018-06-29
Filing date: 2019-06-27
Publication date: 2020-01-07
Also published as: JP2020000669A; CN211009178U

Abstract

The invention provides an air blowing device, which comprises a rotor unit, a stator unit, a bearing holding part and a connecting part. The rotor unit has a magnet and an impeller including a plurality of moving blades, and is rotatable about 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 positioned on one axial side of the stator unit and holds a bearing that rotatably supports the rotor unit. The coupling portion fixes an end portion of the stator unit on one axial side and an end portion of the bearing holding portion on the other axial side.

Description

Air supply device

Technical Field

The present invention relates to an air blowing device.

Background

In the hair dryer described in patent document 1, a blower fan, a motor for rotationally driving the blower fan, and a heater for heating air accelerated by the blower fan are disposed substantially coaxially in a casing. The motor is housed in a mounting frame which is held by the support legs and has a front opening.

Patent document 1: japanese examined patent publication (Kokoku) No. 04-036683

However, in the hair dryer described in patent document 1, since the motor is covered with the mounting frame, the motor is difficult to be cooled, and it is difficult to increase the current supplied to the motor. Therefore, it is difficult to miniaturize the motor and the blower.

Disclosure of Invention

The invention aims to provide a blower capable of reducing the outer diameter without reducing the discharge amount of airflow.

An exemplary blower device of the present invention includes a rotor unit, a stator unit, a bearing holding portion, and a coupling portion. The rotor unit has a magnet and an impeller including a plurality of moving blades, and is rotatable about 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 positioned on one axial side of the stator unit and holds a bearing that rotatably supports the rotor unit. The coupling portion fixes an end portion of the stator unit on one axial side and an end portion of the bearing holding portion on the other axial side.

An exemplary hair dryer of the present invention includes: a package housing; and the air supply device is arranged in the packaging shell.

According to the exemplary air blowing device of the present invention, the outer diameter can be reduced without reducing the discharge amount of the air flow.

Drawings

Fig. 1 is a longitudinal sectional view of the blower device of the present embodiment.

Fig. 2 is a partially cut-away perspective view of the air supply device shown in fig. 1.

Fig. 3 is a cross-sectional perspective view of the air blowing device of the present embodiment.

Fig. 4 is a cross-sectional view of the blower of the present embodiment.

Fig. 5 is an enlarged view of a connection portion of the blower of the present embodiment.

Fig. 6 is a perspective view of the stator unit.

Fig. 7 is a sectional view of a coupling portion according to a first modification of the embodiment of the present invention.

Fig. 8 is a sectional view of a coupling portion according to a second modification of the embodiment of the present invention.

Fig. 9 is a diagram showing a connection portion of an air blowing device according to a third modification of the embodiment of the present invention.

Fig. 10 is a perspective view of the stator unit.

Fig. 11 is a diagram showing a connection portion of an air blowing device according to a fourth modification of the embodiment of the present invention.

Fig. 12 is a diagram showing a connection portion of an air blowing device according to a fifth modification of the embodiment of the present invention.

Fig. 13 is a diagram showing a connection portion of an air blowing device according to a sixth modification of the embodiment of the present invention.

Fig. 14 shows a blower as an example of an application of the air blowing device of the present invention.

Description of the reference symbols

1: a rotor unit; 11: a shaft; 12: a magnet; 13: an impeller; 131: moving blades; 2: a stator unit; 21: a coil; 3: a bearing holding portion; 31. 32: a bearing; 33: a contact portion; 34: a flange portion; 4: a wind tunnel portion; 41: a rib; 5: a connecting portion; 51: a hook portion; 511: an extension portion; 512: a fixed part; 513: a fixed surface; 52: a clamping portion; 521: an insertion portion; 522: a contact portion; 523: a contact surface; 5 b: a connecting portion; 51 b: a hook portion; 511 b: an extension portion; 512 b: a fixed part; 513 b: a fixed surface; 514 b: an inclined surface; 52 b: a clamping portion; 521 b: an insertion portion; 522 b: a contact portion; 523 b: a contact surface; 5 c: a connecting portion; 51 c: a hook portion; 511 c: an extension portion; 512 c: a fixed part; 513 c: a fixed surface; 514 c: an inclined surface; 52 c: a clamping portion; 521 c: an insertion portion; 522 c: a contact portion; 523c, the weight ratio of the sodium hydroxide to the sodium hydroxide is 523 c: a contact surface; 5 d: a connecting portion; 51 d: a hook portion; 511 d: an extension portion; 512 d: a fixed part; 513 d: a fixed surface; 52 d: a clamping portion; 521 d: an insertion portion; 522 d: a contact portion; 523 d: a contact surface; 5 e: a connecting portion; 51 e: a hook portion; 511 e: an extension portion; 512 e: a fixed part; 513 e: a fixed surface; 514 e: an inclined surface; 52 e: a clamping portion; 521 e: an insertion portion; 522 e: a contact portion; 523e, the weight ratio of 523 e: a contact surface; 5 f: a connecting portion; 51 f: a hook portion; 511 f: an extension portion; 512 f: a fixed part; 513 f: a fixed surface; 52 f: a clamping portion; 521 f: an insertion portion; 522 f: a contact portion; 523 f: a contact surface; 5e 2: a connecting portion; 6: a stator core; 61: the back of the iron core; 62: teeth; 7: an insulating member; 71: an upper insulating member; 72: a lower insulating member; 610: dividing the back of the iron core; 711: a beam-like portion; a: an air supply device; c: a central axis; hd: a blower; hd 1: a main body portion; hd 2: a handle portion; ht: a heater; r1: the direction of rotation.

Detailed Description

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification, a direction in which the center axis of the air blowing device extends is simply referred to as "axial direction", a direction perpendicular to the center axis with the center axis of the air blowing device as a center is simply referred to as "radial direction", and a direction along an arc with the center axis of the air blowing device as a center is simply referred to as "circumferential direction". Further, on the drawing, the radial direction is denoted as Dd and the circumferential direction is denoted as Rd as necessary.

In the present specification, for convenience of explanation, the shapes and positional relationships of the respective portions will be described with the axial direction as the vertical direction and the vertical direction in fig. 1 as the vertical direction of the air blowing device. The "upper side" of the air supply device is the "air suction side" and the "lower side" is the "air discharge side". The vertical direction is not limited to the orientation and positional relationship when the air blowing device is used. In the present specification, a section parallel to the axial direction is referred to as a "longitudinal section", a section perpendicular to the axial direction is referred to as a "cross section", and an end face of a cut portion perpendicular to the axial direction is referred to as a "lateral end face".

<1. integral Structure of air blowing device >

Fig. 1 is a longitudinal sectional view of the blower device of the present embodiment. Fig. 2 is a partially cut-away perspective view of the air supply device shown in fig. 1. Fig. 3 is a cross-sectional perspective view of the air blowing device of the present embodiment. Fig. 4 is a cross-sectional view of the blower of the present embodiment. Fig. 5 is an enlarged view of a connection portion of the blower of the present embodiment. Fig. 6 is a perspective view of the stator unit. The blower device a includes a rotor unit 1, a stator unit 2, a bearing holding portion 3, an air tunnel portion 4, and a coupling portion 5.

<1.1 rotor Unit 1>

As shown in fig. 1, the rotor unit 1 is disposed radially inward of the stator unit 2. The rotor unit 1 is disposed to be rotatable about a central axis C extending vertically. That is, the rotor unit 1 is rotatable about the center axis C. The rotor unit 1 includes a shaft 11, a magnet 12, and an impeller 13.

<1.1.1 Axis 11>

The shaft 11 is cylindrical. The shaft 11 is arranged along the center axis C. The shaft 11 is rotatably supported by

bearings

31 and 32 described later with respect to the bearing holding portion 3.

<1.1.2 magnet 12>

The magnet 12 has a cylindrical shape. The magnet 12 is directly or indirectly fixed to the shaft 11, and the shaft 11 is inserted inside the magnet 12. The magnet 12 is disposed radially inward of a stator core 6, which will be described later, of the stator unit 2. The magnet 12 is radially opposed to the stator core 6 with a gap therebetween. The magnet 12 and the shaft 11 are fixed by press-fitting or 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 adopted. As shown in fig. 1, a magnet 12 is fixed to a lower end portion of the shaft 11.

<1.1.3 impeller 13>

The impeller 13 is disposed radially inward of the air tunnel 4. The impeller 13 is disposed 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 portion of the shaft 11. The impeller 13 is rotated about a central axis C extending vertically by the rotation of the rotor unit 1. The impeller 13 has a plurality of rotor blades 131 arranged at equal intervals in the circumferential direction. That is, the rotor unit 1 includes a magnet 12 and an impeller 13 including a plurality of rotor blades 131. The impeller 13 rotates around the central axis C, and generates an air flow from the axially upward direction to the axially downward direction.

<1.2 stator Unit 2>

The stator unit 2 is disposed inside the air tunnel 4. The stator unit 2 is disposed radially outward of the rotor unit 1. To explain further, the stator unit 2 is disposed radially outward of the magnet 12. The stator unit 2 has a stator core 6, an insulator 7, and a coil 21.

<1.2.1 stator core 6>

The stator unit 2 has a stator core 6. The stator core 6 is annular with a center axis C as a center. The stator core 6 is formed by vertically stacking a plurality of electromagnetic steel plates such as silicon steel plates. The stator core 6 has a core back 61 and a plurality of (here, six) teeth 62. The core back 61 is annular with the center axis C as the center. A plurality of teeth 62 protrude radially from the core back 61. 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 portion 61 and a plurality of teeth 62 that protrude radially inward from the core back portion 61 and are arranged at intervals in the circumferential direction.

<1.2.2 coil 21>

The coil 21 is formed of a conductive wire wound around each tooth 62 of the stator core 6 with the insulator 7 interposed therebetween.

<1.2.3 insulating member 7>

The insulator 7 is disposed around the stator core 6. The insulator 7 covers at least a part of the stator core 6. That is, the insulator 7 covers 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. Further, the region of the inner periphery of the teeth 62 facing the magnet 12 of the rotor unit 1 and the outer peripheral surface of the core back 61 are exposed to the outside from the insulator 7. That is, the radially outer side surface of the stator core 6 is exposed to the outside of the insulator 7. 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. This can suppress a decrease in efficiency due to heat.

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

In addition, the insulator 7 has an upper insulator 71 and a lower insulator 72. The upper insulator 71 covers the core back 61 and the upper side of the teeth 62. The lower insulator 72 covers the core back 61 and the underside of the teeth 62. The lower end of the upper insulator 71 is in contact with the upper end of the lower insulator 72.

The stator unit 2 can be divided into six, for example. In the present embodiment, the number of divisions is six, but is not limited to six, and other numbers are also possible. 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 the stator units 2.

As shown in fig. 6, an upper insulator 71 and a lower insulator 72 are provided in accordance with 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 formed integrally.

The coil 21 is formed by winding a wire around the teeth 62 covered with the insulator 7. The insulator 7 has insulation properties, and insulates the coil 21 from the teeth 62. By supplying electricity (current) to the wires constituting the coil 21, the coil 21 and the teeth 62 around which the coil 21 is wound are excited. In the blower a, the excited teeth 62 and the magnets 12 attract or repel each other by magnetic force, and the rotor unit 1 rotates. That is, the rotor unit 1 and the stator unit 2 constitute a so-called motor.

<1.3 bearing holder 3>

The bearing holding portion 3 is disposed above the stator unit. The bearing holding portion 3 holds the

bearings

31 and 32 therein with a gap therebetween. That is, the bearing holding portion 3 holds the

bearings

31 and 32 that rotatably support the rotor unit 1. Examples of the

bearings

31 and 32 include ball bearings. However, it is not limited thereto. The

bearings

31 and 32 may be formed of sleeve bearings or the like. The structure of the

bearings

31 and 32 is determined in consideration of the rotation speed, rotation torque, rotation accuracy of the shaft 11, mountability of the blower a, maintainability, and the like. Since the

bearings

31 and 32 are arranged with a gap in the vertical, i.e., axial direction, the shaft 11 is less likely to oscillate or vibrate during rotation. The rotational accuracy of the shaft 11 can be improved. The magnet 12 is disposed below the bearing holder 3, and the impeller 13 is disposed above the bearing holder 3.

The bearing holder 3 has a contact portion 33 at its lower end portion, which contacts the stator unit 2. The contact portion 33 has a cylindrical shape and has an outer shape larger than that of the upper insulator 71. The upper end of the contact portion 33 has a flange 34 extending inward. The upper insulator 71 is disposed inside the contact portion 33. The upper surface of the upper insulator 71 is in contact with the flange 34. That is, one axial end surface of the stator unit 2 is covered with the bearing holding portion 3. That is, the bearing holding portion 3 is located on one axial side of the stator unit 2. This can prevent foreign matter such as dust and dirt from entering the rotor unit 1. Therefore, the operation of the rotor unit 1 is less likely to become unstable, and stable air blowing operation can be performed over a long period of time.

<1.4 wind tunnel part 4>

The air tunnel 4 is disposed radially outward of the impeller 13 and the stator unit 2. That is, the air blower a further includes a cylindrical air channel portion 4 facing the radially outer side of the outer surface of the stator core 6 with a gap therebetween. Further, a gap between the inner wall surface of the air tunnel 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 is cylindrical with a circular cross section perpendicular to the axial direction. The air tunnel 4 has a plurality of ribs 41 therein. The rib 41 is disposed between the air tunnel 4 and the bearing holding portion 3. The rib 41 connects the inner peripheral surface of the air tunnel 4 and the outer peripheral surface of the bearing holding portion 3. That is, the rib 41 is disposed inside the flow passage FW. The rib 41 extends axially downward. The radially outer end of the rib 41 is connected to a portion of the air tunnel 4 facing the stator unit 2 in the radial direction. By providing the air tunnel portion 4, an air flow flowing around the stator unit 2 can be formed, and the stator core 6 can be cooled efficiently.

In the present embodiment, the bearing holding portion 3, the air tunnel portion 4, and the rib 41 are formed of the same member, but may be formed of different members independent of each other. The plurality of ribs 41 are arranged at predetermined intervals in the circumferential direction and extend in the vertical direction. The lower portion of the rib 41 is bent forward in the rotation direction of the impeller 13 with respect to the upper portion of the rib 41.

The air blowing device a can form a flow path FW between the air tunnel 4 and the stator unit 2. The core back 61 of the stator unit 2 is exposed to the flow passage FW. That is, the radially outer side surface of the stator core 6 is exposed to the outside of the insulator 7. Therefore, the cooling effect of the stator unit 2 can be improved. Further, since the rib 41 connecting the connection portion 5 and the air tunnel portion 4 has a vane shape, the flow of the air flowing through the flow passage FW between the air tunnel portion 4 and the stator unit 2 and the bearing holding portion 3 can be rectified.

<1.5 coupling part 5>

The coupling 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 a coupling portion 5 that fixes one axial end of the stator unit 2 and the other axial end of the bearing holder 3.

As shown in fig. 4, the air blower a has six connection portions 5. Furthermore, the six coupling portions 5 are arranged at equal intervals in the circumferential direction as viewed in the axial direction. That is, a plurality of coupling portions 5 are arranged in the circumferential direction. By arranging the plurality of connecting portions 5, the stator unit 2 and the bearing holding portion 3 can be more firmly fixed. The stator unit 2 and the bearing holding portion 3 are stably fixed by the coupling portions 5 arranged at equal intervals. In addition, the intervals may not be equal.

Each coupling portion 5 is disposed between adjacent teeth 62 as viewed in the axial direction. That is, the coupling portion 5 is disposed between the teeth 62 adjacent in the circumferential direction as viewed in the axial direction. This can simplify the shape of the mold for molding the insulator 7. Therefore, the manufacturing of the insulating member 7 becomes easy. Further, the winding operation in forming the coil 21 is not easily hindered, and workability is improved.

The coupling portion 5 includes a hook 51 and a clip 52. The hook 51 is provided on the insulator 7, and the clamp 52 is provided on the bearing holder 3. That is, the coupling portion 5 has a hook portion 51 provided on the insulator 7 and a clamping portion 52 provided on the bearing holding portion 3. This allows the hook 51 to be molded simultaneously when the insulator 7 is molded. In addition, since the stator unit 2 and the bearing holding portion 3 can be fixed by combining the hook portion 51 and the clip portion 52, the assembly is easy.

The coupling portion 5 is preferably disposed radially inward of the outer surface of the stator core 6. Since the coupling portion 5 is disposed radially inward of the outer surface of the stator core 6, the air flow generated by the rotation of the impeller 13 effectively contacts the stator core. Therefore, the cooling effect of the stator core 6 is improved. In addition, when the stator core 6 can be sufficiently cooled by the airflow, the position of the coupling portion 5 may be located radially outward of the outer surface of the stator core 6.

<1.5.1 hook 51>

As shown in fig. 5, 6, and the like, the hook 51 extends upward from the upper surface of the upper insulator 71 of the insulator 7. In addition, the hook 51 is formed integrally with the upper insulator 71. As shown in fig. 5, 6, and the like, the hook 51 has an extension portion 511 and a fixing portion 512.

The extension 511 extends upward from the upper surface of the upper insulator 71. In addition, the fixing portion 512 extends in the circumferential direction from the upper end portion of the extending portion 511. The fixing portion 512 has a fixing surface 513 at an axial lower end portion. Namely, the hook 51 has: an extension 511 extending from one axial end of the insulator 7 to one axial end; and a fixing portion 512 extending from a front end of the extending portion 511 in a direction intersecting the extending portion 511, and formed with a fixing surface 513 facing the other side in the axial direction.

The fixing portion 512 protrudes in a direction opposite to the rotation direction of the rotor unit 1, for example. Thus, even when a reaction force generated by the rotation of the rotor unit 1 acts on the stator unit 2, the fixation of the stator unit 2 and the bearing holding portion 3 by the coupling portion 5 can be maintained.

<1.5.2 clip part 52>

The clamping portion 52 is formed in the flange portion 34 of the bearing holding portion 3. Six clamping portions 52 are disposed on the flange portion 34. The six clamping portions 52 are arranged at equal intervals in the circumferential direction. The clip portion 52 has an insertion portion 521 and a contact portion 522. The insertion portion 521 is a through hole that penetrates the flange portion 34 in the axial direction. The insertion portion 521 extends along an arc centered on the central axis, i.e., in the circumferential direction, as viewed in the axial direction.

The circumferential length of the insertion portion 521 is equal to or longer than the circumferential length of the hook 51 when viewed in the axial direction. Therefore, by disposing the hook 51 and the insertion portion 521 to overlap in the axial direction, the hook 51 can be inserted into the insertion portion 521. That is, the hook 51 is inserted into the insertion portion 521. The width of the insertion portion 521 in the radial direction is narrower on the rear side in the rotation direction of the rotor unit 1 in the circumferential direction. In addition, the insertion portion 521 and the hook portion 51 are preferably curved in the circumferential direction around the central axis C.

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

As shown in fig. 5, the extension 511 of the hook 51 has the same length as the axial length of the insertion 521. Therefore, when the hook 51 is inserted into the insertion portion 521, the fixing surface 513 overlaps with the axial position of the contact surface 523.

<1.5.3 fixation by means of a connecting portion 5>

A method of fixing the stator unit 2 and the bearing holding portion 3 via the coupling portion 5 will be described. First, the stator unit 2 and the bearing holding portion 3 are arranged such that six hook portions 51 and six clip portions 52 overlap each other in the axial direction. Then, the six hook portions 51 are inserted into the six insertion portions 521, respectively. At this time, the fixing portion 512 of the hook 51 protrudes above the flange 34. Then, by rotating the stator unit 2 in the direction opposite to the rotation direction of the rotor unit 1, the fixing surface 513 of the fixing 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 width of the insertion portion 521 in the radial direction is narrower on the rear side in the rotation direction of the rotor unit 1 in the circumferential direction. Thereby, the extension 511 of the hook 51 is sandwiched by the insertion 521. Thereby, the hook portion 51 and the clamp portion 52 are fixed, and the upper insulator 71 and the bearing holding portion 3 are fixed. That is, the coupling portion 5 fixes one axial end of the insulator 7 and the other axial end of the bearing holder 3. Further, the insulator 7 is included in the stator unit 2. The stator unit 2 and the bearing holding portion 3 are fixed. Therefore, the blower a has a coupling portion 5 that fixes one axial end of the stator unit 2 and the other axial end of the bearing holder 3. Therefore, the stator unit 2 can be held without a member for holding the radially outer side of the stator unit 2. This exposes a part of the stator core 6 to the outside of the insulator 7, thereby improving the cooling efficiency of the stator unit 2.

As described above, the stator unit 2 and the bearing holding portion 3 are fixed by the coupling portion 5. That is, the stator unit 2 is fixed to the air tunnel 4 via the coupling portion 5. Further, the hook portion 51 is formed integrally with the insulator 7 of the stator unit 2, and the clip portion 52 is formed on the flange portion 34 of the bearing holding portion 3, so that a fixing member for fixing the stator unit 2 to the air tunnel portion 4 is not required.

Therefore, the number of components can be reduced in the blower a. This can reduce the cost required for manufacturing and can reduce the weight. Further, since the stator unit 2 is assembled by inserting the hook 51 into the clip 52 and rotating it about the center axis C, the air blower a can be easily assembled.

In the blower device a having the above-described configuration, when the 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 on each other to generate a torque in the rotor unit 1. By this torque, the rotor unit 1 and the impeller 13 rotate around the central axis C. When the impeller 13 rotates, an airflow is generated by the plurality of moving blades 131. That is, the air blowing device a can generate and blow an air flow having an upper side as an air suction side and a lower side as an air discharge side. The airflow generated in the air blowing device a passes between the air tunnel portion 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 to the outside of the insulator 7.

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

As described above, in the blower device a according to the present embodiment, the outer surface of the stator core 6 can be exposed to the outer surface of the insulator 7 without requiring a cover that covers the outer shape of the stator unit 2. This can improve the cooling efficiency of the stator unit 2. Therefore, a large current can be applied to the coil 21. This makes it possible to reduce the size of the air blower a without reducing the amount of air blown. Further, since the size of the stator unit 2 is not changed and a cover for covering the radially outer portion is not required, the radial gap between the stator unit 2 and the air tunnel portion 4 can be increased. This can increase the amount of air flowing inside the blower a, i.e., the discharge amount.

< 2> first modification of air blowing device

Fig. 7 is a sectional view of a coupling portion according to a first modification of the embodiment of the present invention. The blower of the present modification is the same as the embodiment except for the configuration of the connection portion 5 b. Therefore, in the present modification, detailed description of the portions other than the coupling portion 5b is omitted. As shown in fig. 7, the coupling portion 5b has a hook 51b and a clip 52 b. The number of the coupling portions 5b is the same as the number of the coupling portions 5, i.e., six.

<2.1 hook 51b >

The hook 51b has an extension portion 511b and a fixing portion 512 b. The extension 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, and has a longitudinal direction along the axial direction and a short direction along the circumferential direction. That is, the extension 511b has a rectangular shape with a long side in the axial direction when viewed in the radial direction. The lower end portion of the extension portion 511b is elastically displaceable in the radial direction. That is, the extension 511b can be elastically deformed in the radial direction.

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

<2.2 clip part 52b >

The clamping portion 52b is formed in the flange portion 34 of the bearing holding portion 3. The clip portion 52b has an insertion portion 521b and a contact portion 522 b. The insertion portion 521b is a through hole that penetrates the flange portion 34 in the axial direction. The length of the insertion portion 521b in the circumferential direction is the same as or longer than the length of the extension portion 511b in the circumferential direction when viewed in the axial direction. The radial width of the insertion portion 521b is equal to or longer than the radial width of the hook portion 51b when viewed in the axial direction.

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

<2.3 fixation by means of the connecting portion 5b >

A method of fixing the stator unit 2 and the bearing holding portion 3 via the coupling portion 5b will be described. First, the stator unit 2 and the bearing holding portion 3 are arranged such that six hook portions 51b and six clip portions 52b overlap in the axial direction, respectively. When viewed in the axial direction, a part of the inclined surface 514b of the hook 51b is located radially outward of the clamping portion 52 b. In this state, the stator unit 2 is moved axially downward. The inclined surface 514b contacts an edge portion of the insertion portion 521b of the lower surface of the flange portion 34.

In this state, the inclined surface 514b is press-fitted into the inner surface of the insertion portion 521b by moving the stator unit 2 upward in the axial direction. Thereby, the extension 511b is elastically deformed in the radial direction. Then, when the fixing portion 512b moves to a position above the upper surface of the flange portion 34, the force acting on the fixing portion 512b from the insertion portion 521b is released. Thus, the elastically deformed extension 511b is restored. The fixing surface 513b of the fixing portion 512b axially contacts the contact surface 523b of the clamping portion 52 b. This can prevent the stator unit 2 and the bearing holding portion 3 from being separated in the axial direction. In addition, since the extension portion 511b is inserted into the insertion portion 521b, the relative movement of the stator unit 2 and the bearing holder 3 in the circumferential direction is restricted. That is, the stator unit 2 and the bearing holding portion 3 are fixed by the coupling portion 5 b.

In the first modification, the insertion portion 521b is a through hole, but is not limited thereto. For example, a recess recessed in the radial direction is also possible. Further, the recess may be formed on the outer surface or the inner surface of the upper end portion of the bearing holding portion 3 and may be recessed in the radial direction. 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 portion of the bearing holding portion 3. When the fixed portion 512b is moved by a predetermined amount in the axial direction, the fixed portion is inserted into the insertion portion. Thereby, the coupling portion 5b fixes the stator unit 2 and the bearing holding portion 3.

In the present modification, the fixing portion 512b protrudes outward in the radial direction, but the present invention is not limited to this. For example, the projection may be radially inward. In this case, the fixing surface 513b is fixed in contact with the contact surface 523b formed at the radially inner edge of the insertion portion 521 b.

<3. second modification of air blowing device >

Fig. 8 is a sectional view of a coupling portion according to a second modification of the embodiment of the present invention. The blower of the present modification is the same as the embodiment except for the configuration of the connection portion 5 c. Therefore, in the present modification, detailed description of the coupling portion 5c is omitted. As shown in fig. 8, the coupling portion 5c has a hook 51c and a clip 52 c.

<3.1 hook 51c >

The hook 51c has an extension portion 511c and a fixing portion 512 c. The extension 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, and has a longitudinal direction along the axial direction and a short direction along the radial direction. That is, the extension portion 511c has a rectangular shape with a long side in the axial direction when viewed in the circumferential direction. The upper end portion of the extension portion 511c is elastically displaceable in the circumferential direction.

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

<3.2 clip part 52c >

The clamping portion 52c is formed in the flange portion 34 of the bearing holding portion 3. The clip portion 52c has an insertion portion 521c and a contact portion 522 c. The insertion portion 521c is a through hole that penetrates the flange portion 34 in the axial direction. The length of the insertion portion 521c in the radial direction is equal to or longer than the length of the extension portion 511c in the radial direction when viewed in the axial direction. The radial width of the insertion portion 521c is equal to or longer than the radial width of the hook portion 51c when viewed in 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 that contacts the fixing surface 513c of the fixing portion 512b of the hook portion 51c at a portion adjacent to the insertion portion 521c in the upper surface of the flange portion 34.

In the fixation of the stator unit 2 and the bearing holder 3 by the coupling portion 5c, the extending portion 511c is elastically deformed in the circumferential direction, and is the same as the fixation of the stator unit 2 and the bearing holder 3 by the coupling portion 5 b.

As in modification 1 and modification 2, since the

extension portions

511b and 511c are elastically deformed, the air blower a can be easily assembled.

<4. third modification of air blowing device >

Fig. 9 is a diagram showing a connection portion of an air blowing device according to a third modification of the embodiment of the present invention. Fig. 10 is a perspective view of the stator unit. In the present modification, the same structure as the insulator 7 and the coupling portion 5 of the stator unit 2 of the embodiment is provided except for the structure of the insulator 7d and the coupling portion 5d of the stator unit 2 d. Therefore, in the present modification, a detailed description of the insulator 7d and the coupling portion 5d is omitted. As shown in fig. 9, the coupling portion 5d in the third modification includes a hook portion 51d and a clip portion 52 d. The hook 51d is disposed on the bearing holding portion 3, and the clamp 52d is disposed on the insulator 7 d. That is, the coupling portion 5d has a clamping portion 52d provided on the insulator 7 and a hook portion 51d provided on the bearing holding portion 3. The stator unit 2 and the bearing holding portion 3 can be fixed by combining the hook portion 51d and the clip portion 52 d. Therefore, the assembly is easy.

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

<4.1 hook 51d >

As shown in fig. 9, the hook 51d is disposed on the lower surface of the bearing holding portion 3. The hook 51d extends axially downward. Further, the hook portion 51d is formed integrally with the bearing holding portion 3. As shown in fig. 9, the hook 51d has an extension portion 511d and a fixing portion 512 d.

The extending portion 511d extends downward from the lower surface of the bearing holding portion 3. Further, the fixing portion 512d extends in the circumferential direction from the lower end portion of the extending portion 511 d. The fixing portion 512d has a fixing surface 513d at an axial upper end portion. The fixing portion 512 protrudes in a direction opposite to the rotation direction of the rotor unit 1, for example. Thus, even when a reaction force generated by the rotation of the rotor unit 1 acts on the stator unit 2, the fixation of the stator unit 2 and the bearing holding portion 3 by the coupling portion 5d can be maintained. That is, the hook 51d includes: an extension 511d extending from an end portion on the other axial side of the bearing holder 3 to the other axial side; and a fixing portion 512d extending from a front end of the extending portion 511d in a direction intersecting the extending portion 511d, and formed with a fixing surface 513d facing one side in the axial direction.

< 4.2 clamping part 52d >

The clamping portion 52d is disposed on the upper insulator 71 d. The upper insulator 71d has six clamping portions 52d on the beam portion 711. The six gripping portions 52d are arranged at equal intervals in the circumferential direction. The clip portion 52d has an insertion portion 521d and a contact portion 522 d. The insertion portion 521d is a through hole that penetrates a part of the upper insulator 71d in the axial direction. The length of the insertion portion 521d in the circumferential direction is equal to or longer than the length of the hook portion 51d in the circumferential direction when viewed in the axial direction. Therefore, by disposing 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 521 d. The width of the insertion portion 521d in the radial direction is narrower on the rear side in the rotation direction of the rotor unit 1 in the circumferential direction. In addition, the insertion portion 521d and the hook portion 51d are preferably curved in the circumferential direction around 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 that contacts the fixing surface 513d of the fixing portion 512d of the hook 51d at a portion of the lower surface of the beam-like portion 711 adjacent to the insertion portion 521 d. That is, the clamping portion 52d has: an insertion portion 521d into which the hook 51d is inserted; and a contact portion 522d formed with a contact surface 523d, the contact surface 523d facing the other axial side and contacting the fixing surface 513d of the fixing portion 512d inserted in the insertion portion 521 d.

The fixation of the stator unit 2 to the bearing holder 3 by the coupling portion 5d is the same as the fixation of the stator unit 2 to the bearing holder 3 by the coupling portion 5. That is, the hook 51d is inserted into the clamping portion 52d, and the stator unit 2 is rotated about the center axis C in the direction opposite to the rotation direction R1 of the rotor unit 1. This enables the stator unit 2 and the bearing holding portion 3 to be fixed.

<5. fourth modification of air blowing device >

Fig. 11 is a diagram showing a connection portion of an air blowing device according to a fourth modification of the embodiment of the present invention. In the coupling portion 5e of the present modification, the clip portion 52e is provided on the stator core 6, and has the same configuration as the coupling portion 5d of the third embodiment. Therefore, in the present modification, detailed description of the portions other than the coupling portion 5e is omitted. As shown in fig. 11, a coupling portion 5e in the fourth modification includes a hook portion 51d and a clip portion 52 e. The hook 51d is disposed on the bearing holding portion 3, and the clamp 52d is disposed on the insulator 7. That is, the coupling portion 5e has a clamping portion 52e provided to the stator core 6 and a hook portion 51d provided to the bearing holding portion 3. The hook portion 51d can be molded at the same time when the bearing holding portion 3 is molded.

<5.1 clip part 52e >

The clamping portion 52e is formed in the stator core 6. The core back 61 of the stator core 6 has six clamping portions 52 e. The six clamping portions 52e are arranged at equal intervals in the circumferential direction. The clip portion 52e has an insertion portion 521e and a contact portion 522 e. The insertion portion 521e is a recess recessed axially downward from the upper surface of the core back 61. Further, a lateral hole-shaped contact portion 522e is provided, which extends in the circumferential direction from the axially lower end portion, which is the innermost portion of the recess of the insertion portion 521 e. The contact portion 522e has a contact surface 523e on an upper surface thereof, which contacts the fixing surface 513d of the hook 51 d.

The length of the insertion portion 521e in the circumferential direction is equal to or longer than the length of the hook portion 51e in the circumferential direction when viewed in the axial direction. Therefore, by disposing the hook portion 51d and the insertion portion 521e to overlap in the axial direction, the hook portion 51d can be inserted into the insertion portion 521 e. The width of the insertion portion 521e in the radial direction is narrower on the rear side in the rotation direction of the rotor unit 1 in the circumferential direction. The insertion portion 521e and the hook portion 51d are preferably curved in the circumferential direction around the central axis C.

That is, the clamping portion 52d has: an insertion portion 521e into which the hook portion 51d is inserted; and a contact portion 522e formed with a contact surface 523e, the contact surface 523e facing the other axial side and contacting the fixing surface 513d of the fixing portion 512d inserted in the insertion portion 521 e. In addition, the stator unit and the bearing holding portion can be fixed by combining the hook portion and the clip portion, and therefore, assembly is easy.

The stator core 6 in the present modification is a laminated body in which a plurality of electromagnetic steel plates are stacked and arranged in an axial direction. Then, the electromagnetic steel sheets constituting each layer are provided with through holes or recesses constituting the clamping portions 52e in advance, and then laminated to form the clamping portions 52 e. For example, when the stator core 6 is used, it is difficult to form the sandwiching portion 52e inside. Therefore, when the stator core 6 is integrally formed, the holding portion 52e may have a shape that is open on the radially outer surface or the radially inner surface of the stator core 6. With such a configuration, since the outer surface or the inner surface in the radial direction of the stator core 6 can be processed, the clip portion 52e can be easily manufactured.

The fixation of the stator unit 2 to the bearing holder 3 by the coupling portion 5e is the same as the fixation of the stator unit 2 to the bearing holder 3 by the coupling portion 5. That is, the hook 51d is inserted into the clamping portion 52e, and the stator unit 2 is rotated about the center axis C in the direction opposite to the rotation direction R1 of the rotor unit 1. This enables the stator unit 2 and the bearing holding portion 3 to be fixed.

<6. fifth modification of air blowing device >

Fig. 12 is a diagram showing a connection portion of an air blowing device according to a fifth modification of the embodiment of the present invention. In the coupling portion 5e2 of the present modification, the hook portion 51e is provided on the stator core 6, and the configuration is the same as that of the coupling portion 5e of the fourth modification. Therefore, in the present modification, detailed description of the portions other than the connection portion 5e2 is omitted. As shown in fig. 11, a coupling portion 5e2 in the fifth modification includes a hook 51e and a clip 52 e. The hook 51e is disposed on the bearing holding portion 3, and the clamp 52d is disposed on the insulator 7.

<6.1 hook 51e >

The hook 51e has an extension portion 511e and a fixing portion 512 e. 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, and has a longitudinal direction along the axial direction and a short direction along the circumferential direction. That is, the extension 511e has a rectangular shape with a long side in the axial direction when viewed in the radial direction. The upper end of the extension 511e is elastically displaceable in the radial direction.

The fixing portion 512e protrudes radially outward from the upper end of the extending portion 511 e. The fixing portion 512e has a fixing surface 513e and an inclined surface 514 e. The fixing surface 513e is an upper surface of the fixing portion 512 e. The fixing surface 513e is a surface perpendicular to the central axis C. The inclined surface 514e expands in the radial direction as going upward from the lower end portion. Further, the upper end of the inclined surface 514e is connected to the radially outer edge of the fixed surface 513 e. That is, the fixing portion 512e has a wedge shape that tapers in the radial direction as it goes downward. That is, the hook portion 51e is a so-called snap-fit portion.

In the coupling portion 5e, the extension portion 511e is elastically deformed to be coupled to the clip portion 52 e. Thereby, the stator unit 2 and the bearing holding portion 3 are fixed. The modification of the extension portion 511e is the same as that of 5b of the first modification.

The other structure is the same as the fourth modification.

< 7> sixth modification of air blowing device

Fig. 13 is a diagram showing a connection portion of an air blowing device according to a sixth modification of the embodiment of the present invention. In the coupling portion 5f of the present modification, the sandwiching portion 52f is provided in the stator core 6, and has the same configuration as the coupling portion 5e2 of the third embodiment. Therefore, in the present modification, detailed description of the portions other than the coupling portion 5f is omitted. As shown in fig. 13, a coupling portion 5f in the sixth modification includes a hook portion 51f and a clamping portion 52 f. The hook 51f is disposed on the bearing holding portion 3, and the clamp 52f is disposed on the insulator 7.

<7.1 hook 51f >

The hook 51f has an extension portion 511f and a fixing portion 512 f. 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, and has a longitudinal direction along the axial direction and a short direction along the radial direction. That is, the extension portion 511f has a rectangular shape with a long side in the axial direction when viewed in the circumferential direction. The upper end of the extension 511f is elastically displaceable in the radial direction.

The fixing portion 512f protrudes in the circumferential direction from the upper end portion of the extending portion 511 f. The fixing portion 512f has a fixing surface 513f and an inclined surface 514 f. The fixing surface 513f is an upper surface of the fixing portion 512 f. The fixing surface 513f is a surface perpendicular to the central axis C. The inclined surface 514f expands in the circumferential direction as going upward from the lower end portion. Further, the upper end of the inclined surface 514f is connected to the radially outer edge of the fixed surface 513 f. That is, the fixing portion 512f is tapered in the circumferential direction as it goes downward. That is, the hook portion 51f is a so-called snap-fit portion.

<7.2 clip part 52f >

The clamping portion 52f is formed in the core back portion 61 of the stator core 6. The clip portion 52f has an insertion portion 521f and a contact portion 522 f. The insertion portion 521f is a recess recessed downward from the upper surface of the core back 61. The length of the insertion portion 521f in the radial direction is equal to or longer than the length of the extension portion 511f in the radial direction when viewed in the axial direction. The width of the insertion portion 521f in the circumferential direction is equal to or longer than the width of the hook portion 51f in the circumferential direction when viewed in the axial direction. The depth of the insertion portion 521f, that is, the axial length is equal to or longer than the axial length, that is, the protruding length of the hook portion 51 f.

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

Further, the coupling portion 5f is elastically deformed by the extending portion 511f and coupled to the holding portion 52 f. Thereby, the stator unit 2 and the bearing holding portion 3 are fixed. The modification of the extending portion 511f is the same as that of 5c of the second modification.

<8. application example >

A hair dryer as an example of an application example of the air blowing device of the present invention will be described with reference to the drawings. Figure 14 is a cross-sectional view of a blower. The blower Hd shown in fig. 14 includes a main body Hd1, a heater Ht, a handle Hd2, and an air blower a. The main body portion Hd1 and the handle portion Hd2 constitute an enclosure of the hair dryer. Specifically, the blower Hd includes a casing and an air blower a disposed inside the casing. The body Hd1 has a cylindrical shape. The heater Ht is disposed inside the body Hd 1. The grip portion Hd2 has a cylindrical shape, and the upper end portion thereof is connected to the main body portion Hd 1. The interior of the body Hd1 communicates with the interior of the handle Hd 2.

As described above, the blower device a of the present invention can be reduced in diameter without reducing the air volume. Therefore, the blower Hd can be miniaturized. In the blower Hd, a blower a in a state opposite to the top-bottom direction in fig. 1 is disposed inside the handle portion Hd 2. Air is sucked from the lower end of the handle Hd2, and an upward flow of air is generated inside. Then, the airflow having passed through the grip portion Hd2 flows axially inside the body portion Hd 1. At this time, the air flow is heated by the heater Ht disposed inside the main body Hd1 to become warm air, and then discharged to the outside from the discharge portion of the main body Hd 1.

By disposing the blower a in the grip portion Hd2 in this manner, the same airflow as when the blower a is placed in the main body Hd1 can be discharged, and the axial length of the main body Hd1 can be shortened. That is, the blower Hd can be downsized.

<9. others >

While the embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and various modifications can be made without departing from the scope of the present invention. The above embodiments and modifications thereof can be combined as appropriate.

While the embodiments of the present invention have been described above, the embodiments can be variously modified within the scope of the present invention.

Industrial applicability

The air blowing device of the present invention can be used as an airflow generating unit of an apparatus using an airflow, such as a blower, a ventilation fan, or a vacuum cleaner.

Claims

1. An air supply device includes:

a rotor unit having a magnet and an impeller including a plurality of rotor blades, the rotor unit being rotatable about a central axis;

a stator unit disposed radially outside the magnet; and

a bearing holding portion that holds a bearing that rotatably supports the rotor unit,

the stator unit has:

a stator core; and

an insulator covering a portion of the stator core,

the bearing holding portion is located at one side in the axial direction of the stator unit,

the blower has a coupling portion that fixes one axial end of the stator unit and the other axial end of the bearing holder.

2. The air supply arrangement of claim 1,

the connection portion is disposed radially inward of an outer surface of the stator core.

3. The air supply device according to claim 1 or 2,

the plurality of connecting parts are arranged along the circumferential direction.

4. The air supply device according to any one of claims 1 to 3,

the stator core has an annular core back portion and a plurality of teeth that protrude radially inward from the core back portion and are arranged at intervals in a circumferential direction,

the connecting portion is disposed between circumferentially adjacent teeth when viewed in the axial direction.

5. The air supply device according to any one of claims 1 to 4,

the coupling portion fixes an end portion of the insulator on one axial side and an end portion of the bearing holding portion on the other axial side.

6. The air supply arrangement of claim 5,

the coupling portion has a hook portion provided to the insulator and a clamping portion provided to the bearing holding portion,

the hook portion has:

an extension portion extending from an end portion on one side in the axial direction of the insulating member to one side in the axial direction; and

a fixing portion extending from a front end of the extending portion in a direction intersecting the extending portion and formed with a fixing surface facing the other side in the axial direction,

the clamping part comprises:

an insertion portion into which the hook portion is inserted; and

a contact portion formed with a contact surface facing an axial direction side and contacting the fixing surface of the fixing portion inserted in the insertion portion.

7. The air supply arrangement of claim 5,

the coupling portion has a clamping portion provided to the insulator and a hook portion provided to the bearing holding portion,

the hook portion has:

an extending portion extending from an end portion on the other axial side of the bearing holding portion to the other axial side; and

a fixing portion extending from a front end of the extending portion in a direction intersecting the extending portion and formed with a fixing surface facing one side in an axial direction,

the clamping part comprises:

an insertion portion into which the hook portion is inserted; and

a contact portion formed with a contact surface facing the other side in the axial direction and contacting the fixing surface of the fixing portion inserted in the insertion portion.

8. The air supply device according to any one of claims 1 to 4,

the coupling portion has a clamping portion provided to the stator core and a hook portion provided to the bearing holding portion,

the hook portion has:

the clamping part comprises:

an insertion portion into which the hook portion is inserted; and

9. The air supply device according to any one of claims 6 to 8,

the extension portion is capable of elastic deformation in the circumferential direction.

10. The air supply device according to any one of claims 6 to 8,

the extension portion is capable of elastic deformation in the radial direction.

11. The air supply device according to any one of claims 1 to 10,

an end surface of the stator unit on one axial side is covered with the bearing holding portion.

12. The air supply device according to any one of claims 1 to 11,

the air blowing device further includes a cylindrical air tunnel portion facing the outer side surface of the stator core with a gap therebetween on a radially outer side of the outer side surface of the stator core.

13. The air supply apparatus according to any one of claims 1 to 12,

the radial outer side surface of the stator core is exposed to the outer side of the insulating member.

14. A hair dryer, comprising:

a package housing; and

the air blowing device according to any one of claims 1 to 13, which is disposed inside the package casing.