CN218335480U - Motor and blower - Google Patents

Abstract

A motor and a blower device, the motor includes: a stator core; an insulator; a coil formed by winding a wire around an insulator; and a circuit board disposed on one axial side of the stator core and electrically connected to the coil. The circuit board has a plurality of recesses recessed radially outward from edges of through-holes formed in a central portion. The insulator has a latch portion extending toward the circuit substrate side and received in the recess. The recess has an inner side surface. The outer side surfaces of both ends in the circumferential direction of the locking portion have an inclination that contacts at least one of the inner side surfaces of the recess.

Description

Motor and air supply device

Technical Field

The utility model relates to a motor and use air supply arrangement of motor.

Background

In a conventional motor, an engaging portion provided on an insulator attached to a stator is inserted into an opening in the center of a circuit board, thereby attaching the circuit board to the insulator.

(see, for example, patent document 1).

Documents of the prior art

Patent literature

Patent document 1: japanese patent laid-open publication No. 2011-166857

SUMMERY OF THE UTILITY MODEL

However, when the circuit board is mounted by inserting the engaging portion into the opening of the circuit board, the inner peripheral surface of the opening of the circuit board is positioned by contacting the engaging portion. In this case, in order to accurately position the circuit board, at least 3 points of the inner peripheral surface need to be in contact with the circuit board, which may complicate the manufacture of the insulator and the circuit board. Further, if the shape and position of the engaging portion and the shape and position of the opening of the circuit board are not accurate, the position of the circuit board in the motor may be deviated.

Therefore, an object of the present invention is to provide a motor having a simple structure and capable of accurately positioning a circuit board.

Further, an object of the present invention is to provide an air blower that can be manufactured by a simple operation.

The exemplary motor of the present invention has: a stator core centered on a vertically extending central axis; an insulator covering the stator core; a coil formed by winding a wire around an insulator; and a circuit board disposed on one axial side of the stator core and electrically connected to the coil. The circuit board has: a through hole formed in the central portion when viewed in the axial direction; and a plurality of recesses recessed radially outward from edges of the through-holes. The insulator has a latch portion extending toward the circuit board side in the axial direction and received in a recess of the circuit board. The recess has a pair of inner side surfaces opposed in a circumferential direction. The circumferential interval between the pair of inner side surfaces becomes narrower toward the radial direction side. The locking part has outer side surfaces arranged at two circumferential ends. The outer side surface has an inclination that contacts at least one of the inner side surfaces of the recess.

The utility model discloses an exemplary air supply arrangement has: a motor; an impeller mounted on the rotor; and a frame covering a radially outer side of the impeller. A base is integrally formed with the frame.

Effect of the utility model

According to the exemplary motor of the present invention, the structure is simple, and the circuit board can be accurately positioned.

In addition, according to the exemplary air supply device of the present invention, it is possible to form with a simple work.

Drawings

Fig. 1 is a perspective view showing an example of the air blowing device of the present invention.

Fig. 2 is an exploded perspective view of the blower device shown in fig. 1.

Fig. 3 is a perspective view of the second frame.

Fig. 4 is a longitudinal sectional view of the blower device shown in fig. 1.

Fig. 5 is a perspective view of the housing.

Fig. 6 is a plan view of the circuit board and the stator.

Fig. 7 is a bottom view of the circuit board.

Fig. 8 is a bottom view of the stator.

Fig. 9 is a perspective view of the stator and the circuit board in an exploded state.

Fig. 10 is an enlarged cross-sectional view of the locking portion.

Fig. 11 is an enlarged cross-sectional view of the first recess and the first locking portion.

Fig. 12 is an enlarged cross-sectional view of the second recess and the second locking portion.

Fig. 13 is a flowchart showing a manufacturing process of the blower device.

Fig. 14 is a sectional view of the case in a state where the stator and the circuit board are housed, the case being turned upside down.

Fig. 15 is a plan view showing a recess and a locking portion of a modification.

Detailed Description

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification, in the air blowing device a, a direction parallel to the central axis Cx of the air blowing device a is referred to as an "axial direction", a direction orthogonal to the central axis Cx of the air blowing device a is referred to as a "radial direction", and a direction along an arc centered on the central axis Cx of the air blowing device a is referred to as a "circumferential direction". In the present specification, the shape and positional relationship of each part will be described with the axial direction as the vertical direction and the side of the air intake port 121 of the frame 10 as the upper side with respect to the impeller 30 in the air blowing device a. The vertical direction is a name for explanation only, and does not limit the positional relationship and direction of the blower a in the use state. "upstream" and "downstream" respectively indicate upstream and downstream in the flow direction of the air flow generated when the impeller 30 is rotated.

<1. Construction of air blower A >

Fig. 1 is a perspective view showing an example of a blower device a according to the present invention. Fig. 2 is an exploded perspective view of the blower device a shown in fig. 1. Fig. 3 is a perspective view of the second frame 102. Fig. 4 is a sectional view of the blower device a shown in fig. 1.

As shown in fig. 1 to 4, the blower a of the present embodiment includes a frame 10, a motor 20, and an impeller 30. The motor 20 is fixed to the frame 10. A rotor 25 described later of the motor 20 is rotatable with respect to the frame 10. The impeller 30 is attached to the rotor 25 and rotates around the central axis Cx by the rotation of the rotor 25.

Specifically, the blower a includes a motor 20, an impeller 30 attached to a rotor 25, which will be described later, of the motor 20, and a frame 10 covering the outer side in the radial direction of the impeller 30.

In the air blower a, when the impeller 30 rotates in a predetermined rotation direction Rd (see fig. 1), air is pushed by the later-described blades 32 of the impeller 30, and an airflow is generated inside the later-described air tunnel portion 12 of the frame 10.

< 2> Structure of frame 10

As shown in fig. 1 to 4, the frame 10 includes a frame body 11 and an air tunnel 12. Frame 10 in the present embodiment is formed as an integral molded body with a base 261 of a cover 26, described later, of motor 20. That is, the base 261 is a part of the motor 20, and is a part of the frame 10. Details of the base 261 will be described later. That is, the base 261 is integrally formed with the frame 10.

The frame body 11 is an exterior member of the blower device a. The frame body 11 is formed of resin. The air channel portion 12 is disposed inside the frame body 11 and has a cylindrical inner peripheral surface. As shown in fig. 1, 4, and the like, the wind tunnel portion 12 extends along the central axis Cx. Further, the center line of the inner peripheral surface of the wind tunnel portion 12 coincides with the central axis Cx.

The wind tunnel portion 12 is a guide for guiding an airflow generated by the rotation of the impeller 30 along the central axis Cx. The air tunnel portion 12 has an air inlet 121 at the upper axial end and an air outlet 122 at the lower axial end. That is, when the impeller 30 rotates, air is sucked from the air inlet 121, and the air flow accelerated by the impeller 30 is discharged from the air outlet 122.

The frame body 11 has a square rectangular parallelepiped shape when viewed from the axial direction. As viewed in the axial direction, mounting holes 111 penetrating in the axial direction are formed at four corners of the square. For example, a screw, a boss, or the like provided in the device is inserted into the mounting hole 111. The frame body 11 is fixed to the device by fixing means such as a nut or a caulking boss to a projecting portion of a screw. The frame body 11 is square as viewed from the axial direction, but may be circular, rectangular, hexagonal, or other polygonal shape. The shape may be a shape corresponding to the shape of the position of the apparatus to which the air blowing device a is attached.

The frame 10 has a plurality of stationary blades 13 projecting radially inward from the inner peripheral surface of the air tunnel 12. The stationary blade 13 connects the wind tunnel portion 12 and the base 261 of the motor 20. In other words, the base 261 is held by the air tunnel portion 12 via the stationary blade 13. The airflow generated by the rotation of the impeller 30 is rectified by the stationary blades 13.

As shown in fig. 1, 2, and the like, the frame 10 can be disassembled into a first frame part 101 and a second frame part 102. The first frame part 101 is disposed above the second frame part 102. That is, the frame 10 has a first frame portion 101 and a second frame portion 102 connected axially below the first frame portion 101. The first frame portion 101 and the second frame portion 102 may adopt a structure that is detachably combined using a snap mechanism, but are not limited thereto. For example, the fixing may be performed using a fixing member such as a screw.

The frame 10 has a lead arrangement portion 103 formed by combining the first frame portion 101 and the second frame portion 102. A lead 45 described later connected to a circuit board 40 described later of the motor is disposed in the lead disposing portion 103.

The blower device a configured as described above can stably discharge a constant air volume.

<3. Structure of Motor 20 >

The motor 20 is disposed inside the frame 10. The motor 20 includes a shaft 21, a bearing housing 22, a housing 23, a stator 24, a rotor 25, a cover 26, a resin portion 60, a circuit board 40, and a wiring portion 29.

<3.1 Axis 21>

The shaft 21 extends along the central axis Cx. The shaft 21 is cylindrical, and the center line coincides with the center axis Cx. The shaft 21 is rotatably supported at two axially separated places on the bearing housing 22 by bearings 211. That is, the shaft 21 can rotate around the central axis Cx extending in the vertical direction.

Here, the bearing 211 is a ball bearing, but is not limited thereto. A bearing capable of supporting the shaft 21 so as to be rotatable about the center axis Cx can be widely employed. The shaft 21 is inserted and fixed in the inner cylinder of the bearing 211. The fixation of the shaft 21 to the inner cylinder of the bearing 211 is performed by press fitting, but is not limited thereto. The shaft 21 and the inner cylinder of the bearing 211 may be fixed by a fixing method such as adhesion or screw fixation.

The shaft 21 is rotatably supported by bearings 211 at two axially separated places. This can suppress shaft chatter, shaft misalignment, and the like when the shaft 21 rotates. Thereby, the rotation of the shaft 21 is stabilized.

<3.2 bearing housing 22>

The bearing housing 22 is made of metal and has a cylindrical shape extending along the central axis Cx. The bearing housing 22 has a bearing holding portion 221 for holding the bearing 211 on its inner circumferential surface. The bearing holding portion 221 has a stepped shape extending from the inner peripheral surface in a direction orthogonal to the central axis Cx. Further, the bearing 211 can be positioned in the axial direction by bringing the outer ring of the bearing 211 into contact with the bearing holding portion 221. The bearing 211 is fixed to the inner peripheral surface of the bearing housing 22 by press fitting. However, the bearing 211 may be fixed by a fixing method other than press fitting such as screwing or bonding. The bearing housing 22 is cylindrical, and rotatably supports the shaft 21 via a bearing 211.

A stator 24 is fixed to an outer peripheral surface of the bearing housing 22. To explain further, a stator core 241 of the stator 24, which will be described later, is fixed to the outer peripheral surface of the bearing housing 22. The stator core 241 is fixed to the outer peripheral surface of the bearing housing 22 by press fitting. However, the stator 24 and the bearing housing 22 may be fixed by a fixing method other than press fitting.

A cover 26 is attached to a lower end portion of the outer peripheral surface of the bearing housing 22. The cover 26 will be described in detail later.

<3.3 case 23>

The housing 23 will be described below with reference to the new drawings. Fig. 5 is a perspective view of the housing 23. As shown in fig. 4, 5, and the like, the housing 23 is a bottomed cylinder extending in the axial direction about the central axis Cx, and holds the bearing housing 22.

The housing 23 has a cylindrical portion 231 and a lid portion 232. As shown in fig. 4, the tube 231 is cylindrical and extends along the central axis Cx. The center line of the tube 231 coincides with the center axis Cx. The cylindrical portion 231 of the housing 23 has an opening 230 at a lower end. Opening 230 is covered with cover 26.

The cover 232 extends radially inward from the upper end of the cylindrical portion 231 in the axial direction. The cover 232 has bearing housing mounting bosses 233. The bearing housing mounting boss 233 extends axially downward from the center of the cover 232. The bearing housing mounting boss 233 is cylindrical. The upper end portion of the outer peripheral surface of the bearing housing 22 is fixed to the inner peripheral surface of the bearing housing attachment boss 233. Further, the bearing housing 22 and the bearing housing mounting boss 233 are fixed by press-fitting, but the present invention is not limited thereto, and fixing methods such as adhesion and welding may be employed.

The tube portion 231 of the housing 23 has a first protrusion 291 of the wiring portion 29, which will be described later. The first projection 291 is formed integrally with the tube 231. The details of the wiring portion 29 and the first projecting portion 291 will be described later.

<3.4 mask portion 26>

Cover 26 expands in the direction orthogonal to central axis Cx. Cover portion 26 has a base 261 and a bushing 262. As shown in fig. 2 and 4, the base 261 has an annular shape. The outer edge of the base 261 is connected to the radially inner end of the stationary blade 13 of the frame 10. In the motor 20 of the present embodiment, the base 261 of the cover 26 and the second frame portion 102 of the frame 10 are integrally molded bodies of resin. That is, the second frame portion 102 and the base 261 are integrally formed.

The bushing 262 is annular and is disposed at the center of the base 261. The bushing 262 is integrally formed with the base 261. That is, at least a portion of the bushing 262 may be integrally fixed to the base 261. With this configuration, cover 26 can be easily manufactured.

In the present embodiment, the bushing 262 is made of metal, and the base 261 is made of resin. Therefore, cover 26 is, for example, an insert molded body. However, the present invention is not limited to this, and the bushing 262 may be fixed (integrated) to the base 261 by a fixing method such as adhesion or screwing. In the present embodiment, the bush 262 is made of a material harder than the bearing housing 22. However, the present invention is not limited thereto. The lower end portion of the bearing housing 22 is pressed into the bush 262. That is, the cover 26 includes an annular base 261 and a bush 262 disposed radially inside the base 261 and fixed to a lower end portion of the outer peripheral surface of the bearing housing 22.

As shown in fig. 4 and the like, the cover portion 26 has a cap portion 263 that closes an opening of the lower end portion of the bearing housing 22. The cap 263 is mounted on the lower surface of the base 261 of the cover 26. The cap 263 is in close contact with the inner peripheral surface of the bearing housing 22. Here, "close contact" means a state in which there is no gap through which foreign matter such as water, dust, or dirt can pass. That is, cover 26 covers opening 230 formed in the lower end of case 23. In this way, the cap 263 is in close contact with the opening at the lower end in the bearing housing 22, and foreign matter such as water, dust, and dirt is prevented from entering the bearing housing 22. This allows the bearing 211 to operate stably for a long period of time.

Cover 26 has a second projection 292. The second projecting portion 292 projects radially outward from the radially outer edge of the base 261. When cover 26 is attached to case 23, second protrusion 292 is disposed axially below first protrusion 291. The second protrusion 292 will be described in detail later.

<3.5 stator 24>

As shown in fig. 4 and the like, the stator 24 is housed in a space surrounded by the bearing housing 22, the housing 23, and the cover 26. The stator 24 has a stator core 241, an insulator 242, and a coil 243.

The stator core 241 has conductivity. The stator core 241 is centered on a central axis Cx extending in the vertical direction. In the present embodiment, the stator core 241 has a structure in which electromagnetic steel plates are laminated. However, the stator core 241 is not limited to this configuration, and may be a single member formed by sintering powder, casting, or the like. The stator core 241 has an annular core back 244 and a plurality of tooth portions 245. The core back 244 has a ring shape extending in the axial direction. The tooth portion 245 protrudes radially outward from the outer peripheral surface of the core back 244. The plurality of tooth portions 245 are arranged at equal intervals in the circumferential direction.

The insulator 242 is a resin molded body. The insulator 242 covers at least the tooth portion 245 in the stator core 241. That is, the insulator 242 covers at least a portion of the stator core 241. A coil 243 is formed at the tooth portion 245 covered with the insulator 242. That is, the coil 243 is formed by winding a wire around the insulator 242. The motor 20 is a dc brushless motor. Therefore, 3 wires 247 are led out from different coils 243, respectively. That is, the stator 24 has a coil 243 and a lead wire 247 led out from the coil 243.

The insulator 242 insulates the stator core 241 from the coil 243. In the present embodiment, the insulator 242 is a resin molded body, but is not limited thereto. A structure capable of insulating stator core 241 and coil 243 can be widely used.

The insulator 242 has an insulator cylinder 246 extending axially downward. The lower end of the insulator cylinder 246 is in contact with the upper surface of the circuit board 40.

In the present embodiment, the inner peripheral surface of the stator core 241 is fixed to the outer peripheral surface of the bearing housing 22 by press fitting. Thereby, the stator 24 is fixed to the bearing housing 22. The stator 24 is fixed to the bearing housing 22 by not only press fitting but also a fixing method such as welding or bonding. In the present embodiment, the stator 24 is fixed to the bearing housing 22, but the present invention is not limited to this, and the outer peripheral surface of the stator 24 may be fixed to the inner peripheral surface of the cylindrical portion 231 of the housing 23. The stator 24 may be fixed to both the bearing housing 22 and the housing 23. That is, the stator 24 is disposed inside the housing 23 and fixed to at least one of the housing 23 and the bearing housing 22.

<3.6 rotor 25>

The rotor 25 is disposed radially outward of the stator 24. The rotor 25 is fixed to the shaft 21. That is, the rotor 25 is fixed to the shaft 21 and disposed radially outward of the housing 23. The rotor 25 has a rotor cover 251 and a magnet 252. The rotor cover 251 has a cover tubular shape.

The rotor cover 251 has a rotor cylinder 253, a rotor top plate 254, and a shaft fixing boss 255. The rotor cylinder 253 has an annular shape extending in the axial direction. The rotor cylinder 253 is disposed radially outward of the housing 23.

The rotor top plate 254 extends radially inward from the axial upper end of the rotor cylinder 253. The shaft fixing boss 255 is disposed at the center of the rotor top plate 254 as viewed in the axial direction. The shaft fixing boss 255 and the rotor top plate 254 are integrally formed. The shaft fixing boss 255 is cylindrical and penetrates in the axial direction. The shaft 21 penetrates the shaft fixing boss 255, and the outer peripheral surface of the shaft 21 is fixed to the inner peripheral surface of the shaft fixing boss 255. Thereby, the rotor cover 251 of the rotor 25 is fixed to the shaft 21.

As shown in fig. 2, 4, and the like, the magnet 252 has a cylindrical shape. The magnet 252 is formed in a cylindrical shape in which N and S poles are alternately magnetized in the circumferential direction. The outer peripheral surface of the magnet 252 is fixed to the inner peripheral surface of the rotor tube 253.

In the present embodiment, the magnet 252 is an integrally molded body of a resin mixed with magnetic powder. However, the present invention is not limited to this configuration, and a plurality of magnets may be arranged in the circumferential direction and fixed with resin or the like.

As described above, the rotor 25 of the motor 20 in the present embodiment is disposed radially outward of the stator 24. The rotor 25 rotates around the stator 24. That is, the motor 20 is an outer rotor type motor.

Further, an impeller 30 is attached to the outside of the rotor cover 251. The impeller 30 is fixed to the rotor cover 251 by, for example, adhesion. Thereby, the impeller 30 is rotated by the rotation of the rotor 25. The fixation of the impeller 30 and the rotor cover 251 is not limited to adhesion, and may be performed by a fixation method such as press fitting, welding, or welding.

<3.7 Structure of Circuit Board 40 >

Fig. 6 is a plan view of the circuit board 40 and the stator 24. Fig. 7 is a bottom view of the circuit board 40. In the circuit substrate 40 shown in fig. 7, the conductive lines 247 are shown by dot-dash lines. The circuit board 40 is annular. An electronic component 41 is mounted on the surface of the circuit board 40, and a control circuit for supplying power to the coil 243 is formed.

A through hole 400 penetrating in the axial direction is formed in the center of the circuit board 40. The bearing housing 22 passes through the through hole 400. As shown in fig. 4 and the like, the circuit board 40 is disposed below the stator 24 and held by the insulator 242 of the stator 24. That is, the circuit board 40 is disposed on one axial side of the stator core 241. In this case, the circuit board 40 is disposed inside the case 23. That is, the motor 20 further includes a circuit board 40 disposed inside the housing 23.

The circuit board 40 has a recess 42 recessed radially outward from an edge of the through-hole 400. That is, the circuit board 40 includes: a through-hole 400 formed in the central portion when viewed in the axial direction; and a plurality of recesses 42 recessed radially outward from the edge of the through-hole 400.

The latch 50 provided on the insulator 242 is received in the recess 42. By housing the latch 50 in the recess 42, the circuit board 40 is held by the stator 24. The details of the recess 42 and the locking portion 50 will be described later.

The outer peripheral surface of the circuit board 40 has a notch 43 recessed radially inward. Different lead wires 247 are arranged in the cutout portions 43, and the leading ends of the lead wires 247 are wired on the lower surface side of the circuit board 40. The leading ends of the wires 247 are electrically connected to pads 44 disposed on the bottom surface of the circuit board 40 (see fig. 7). That is, the circuit board 40 is electrically connected to the coil 243. The lead wires 247 are routed from the upper surface side to the lower surface side of the circuit board 40 through the cutout portions 43, and are electrically connected to the circuit (pads 44) on the lower surface side of the circuit board 40. The electrical connection between the lead 247 and the pad 44 is performed by, for example, soldering. However, the connection between the lead 247 and the pad 44 is not limited to soldering, and bonding with a conductive adhesive, screwing, or the like may be employed.

Since the circuit board 40 has the cutout 43, the lead 247 can be wired to the lower surface of the circuit board 40 through the cutout 43. Thus, wiring of the lead wires 247 to the lower surface of the circuit board 40 is facilitated as compared with a case where the circuit board 40 is provided with a hole portion for passing the lead wires 247 therethrough instead of the notch portion 43. For example, after the circuit substrate 40 is mounted below the stator 24, the lead wires 247 are routed to the lower surface of the circuit substrate 40. At this time, since the lead wires 247 are routed through the notch 43 that opens at the outer edge in the radial direction of the circuit board 40, the stator 24 is less likely to be an obstacle, and the lead wires 247 are easily routed.

The stator 24 has a lead portion 248 from which a lead wire is led out from the coil 243. The lead-out portion 248 is provided at 3 points on the stator 24. A different lead 247 is led from each lead-out location 248.

As shown in fig. 6, when the circuit board 40 is mounted on the stator 24, the notch 43 and the lead-out portion 248 are circumferentially displaced from each other. With this configuration, the wires 247 can be wired along the tangential direction of the core back 244 of the stator core 241. This suppresses interference between the lead 247 and the housing 23 or other member, and suppresses disconnection of the lead 247.

The circuit board 40 is connected to a lead 45 (see fig. 4). That is, the motor 20 further includes a lead wire 45 connected to the circuit board. The lead wire 45 connects a power supply device disposed outside the motor 20, in other words, outside the blower device a, to the circuit board 40.

<3.8 recesses 42 and engaging portions 50>

Fig. 8 is a bottom view of the stator 24. Fig. 9 is a perspective view of the stator 24 and the circuit board 40 in an exploded state. Fig. 10 is an enlarged cross-sectional view of the locking portion 50. As shown in fig. 8 and 9, the insulator 242 has two locking portions 50. The circuit board 40 has two recesses 42. The latch 50 is housed in a recess 42 formed in a through-hole 400 of the circuit board 40. That is, the insulator 242 has the latch portion 50 extending toward the circuit board 40 side in the axial direction and housed in the recess 42 of the circuit board 40. The insulator 242 has two latching portions 50, and the circuit board 40 has two recesses 42.

The circuit board 40 has two recesses 42 having different shapes. That is, the circuit board 40 has at least one recess 42 having a shape different from that of the other recesses 42 when viewed in the axial direction.

In the following description, one of the two recesses 42 is referred to as a first recess 42a (see fig. 7, 9, etc.) and the other recess 42 is referred to as a second recess 42b (see fig. 7, 9, etc.) as necessary. The two engagement portions 50 include a first engagement portion 50a accommodated in the first recess 42a and a second engagement portion 50b accommodated in the second recess 42b, as necessary.

Fig. 11 is an enlarged cross-sectional view of the first recess 42a and the first locking portion 50 a. In fig. 11, a line extending in the radial direction through the center (central axis Cx) of the through-hole 400 is defined as a reference line Sd.

As shown in fig. 11, the first recess 42a has an inward surface 421, and a first inward surface 422 and a second inward surface 423 that face each other in the circumferential direction. That is, the recess 42a (42 b) has a pair of circumferentially opposing inner surfaces (first inner surface 422 and second inner surface 423, third inner surface 425 and fourth inner surface 426). The inward facing surface 421 faces radially toward the center of the through-hole 400. The first inner surface 422 and the second inner surface 423 are connected to both ends of the inward surface 421 in the circumferential direction, respectively. The first inner side surface 422 circumferentially opposes the second inner side surface 423.

In the first recess 42a, the circumferential interval between the first inner surface 422 and the second inner surface 423 becomes narrower toward the radially outer side. That is, the circumferential intervals between the first inner surface 422 and the second inner surface 423 are narrowed toward the radial direction side. The first inner surface 422 and the second inner surface 423 approach each other radially outward. To be more specific, the first inner surface 422 and the second inner surface 423 are inclined with respect to the reference line Sd and are line-symmetrical with respect to the reference line Sd when viewed from the axial direction. That is, the first inner surface 422 and the second inner surface 423 of the at least one recess 42a are arranged line-symmetrically with respect to the reference line Sd. The first inner side surface 422 and the second inner side surface 423 may not be line-symmetric.

Further, the circumferential widths of the first inner surface 422 and the second inner surface 423 are narrowed toward the radial outside as the first recessed portion 42a, but the present invention is not limited thereto. As described later in detail, for example, the first inner surface 422 and the second inner surface 423 may have a shape in which the circumferential width is narrowed inward in the radial direction (see fig. 15).

Fig. 12 is an enlarged cross-sectional view of the second recess 42b and the second locking portion 50b. In fig. 12, similarly to fig. 11, a line extending in the radial direction through the center (central axis Cx) of the through-hole 400 is defined as a reference line Sd.

As shown in fig. 12, the second recess 42b has an inward facing surface 424, a circumferentially opposite third inward facing surface 425, and a fourth inward facing surface 426. The inward facing surface 424 faces radially toward the center of the through-hole 400. The third inner side surface 425 and the fourth inner side surface 426 are connected to both ends of the inward surface 424 in the circumferential direction. The third interior side 425 is circumferentially opposite the fourth interior side 426.

In the second recess 42b, the circumferential interval between the third inner side surface 425 and the fourth inner side surface 426 becomes narrower toward the radially outer side. That is, the circumferential interval between the third inner side surface 425 and the fourth inner side surface 426 becomes narrower toward the radial direction side. The third inner side surface 425 extends parallel to the reference line Sd. That is, the one inner side surface 425 of the at least one recess 42b extends in parallel with the reference line Sb that passes through the center (central axis Cx) of the through-hole and extends in the radial direction. Here, the term "parallel" includes not only a case of being completely parallel but also a case of being inclined by about several degrees to about ten and several degrees. Further, inner side surface 426 approaches inner side surface 425 toward the radially outer side.

As shown in fig. 9, 11, and the like, the first locking portion 50a includes an elastic support portion 51 and a claw portion 52. The elastic support portion 51 extends downward from the lower end of the insulator cylinder portion 246 along the center axis Cx. The elastic support portion 51 can be elastically bent and deformed.

The elastic support portion 51 has a first outer side surface 511 and a second outer side surface 512 disposed at both ends in the circumferential direction. That is, the locking portion 50a has outer side surfaces (a first outer side surface 511 and a second outer side surface 512) disposed at both ends in the circumferential direction. The first outer side surface 511 and the second outer side surface 512 are surfaces facing circumferentially opposite sides, respectively. The circumferential widths of the first outer side surface 511 and the second outer side surface 512 become narrower toward the radially outer side. First outer side surface 511 and second outer side surface 512 approach each other toward the radially outer side. The first outer side surface 511 and the second outer side surface 512 are line-symmetric with respect to a line (reference line Sd in fig. 11) passing through the circumferential center of the elastic support portion 51.

The claw portion 52 protrudes radially outward from the lower end portion of the elastic support portion 51. The pawl portion 52 has an inclined surface 521 and a contact surface 522. The inclined surface 521 is a surface having an inclination toward the radially outer side as it goes upward. The contact surface 522 is orthogonal to the central axis Cx and contacts the upper end of the inclined surface 521.

As shown in fig. 10 and 11, the first locking portion 50a is housed in the first recess 42a. The first locking portion 50a is inserted into the first recess 42a from above. At this time, the inclined surface 521 comes into contact with the inward surface 421 of the first recess 42a. When the first engaging portion 50a further moves downward, the inclined surface 521 is pressed by the inward surface 421, and the elastic support portion 51 elastically deforms radially inward. Thereby, the claw portion 52 of the first hooking portion 50a passes through the first recess 42a.

When the claw portion 52 moves below the lower surface of the circuit substrate 40, the elastic support portion 51 returns to the original shape. At this time, the contact surface 522 of the claw portion 52 contacts the lower surface of the circuit substrate 40. At this time, the lower surface of the insulator cylinder 246 is in contact with the upper surface of the circuit board 40.

When the claw portion 52 passes through the first recess 42a, the first outer surface 511 of the elastic support portion 51 contacts the first inner surface 422 of the first recess 42a, and the second outer surface 512 contacts the second inner surface 423. The first locking portion 50a is radially separated from the inward surface 421 of the first recess 42a (see fig. 11). That is, at least one of the outer side surfaces (first outer side surface 511 and second outer side surface 512) is in contact with at least one of the inner side surfaces (first inner side surface 411 and second inner side surface 412) of the recess 42a.

Further, the engaging portion 50 may be configured to be in point contact with at least one of the first inner surface 411 and the second inner surface 412 when viewed from the axial direction. Even in the case of such a structure, the catching portion 50 is positioned before contacting the inward surface 421. This enables the circuit board 40 to be positioned even when the shapes of the recess 42a and the hooking portion 50 are deviated.

As shown in fig. 9, 12, and the like, the second locking portion 50b includes an elastic support portion 53 and a claw portion 54. The elastic support portion 53 extends downward from the lower end portion of the insulator cylinder portion 246 along the center axis Cx. The elastic support portion 53 can be elastically bent and deformed.

The elastic support portion 53 has a third outer surface 531 and a fourth outer surface 532 disposed at both ends in the circumferential direction. That is, the engaging portion 50b has outer side surfaces (third outer side surface 531 and fourth outer side surface 532) disposed at both ends in the circumferential direction. The third outer side surface 531 and the fourth outer side surface 532 are surfaces facing circumferentially opposite sides, respectively. The circumferential widths of the third outer side surface 531 and the fourth outer side surface 532 become narrower toward the radially outer side. The third outer side surface 531 extends along a line (reference line Sd in fig. 12) passing through the circumferential center of the elastic support portion 53. The fourth outer side surface 532 approaches the outer side surface 531 toward the radially outer side.

The claw portion 54 has the same structure as the claw portion 52. The inclined surface 541 and the contact surface 542 of the pawl portion 54 correspond to the inclined surface 521 and the contact surface 522 of the pawl portion 52. Therefore, detailed description of the claw portion 54 is omitted.

As shown in fig. 10 and 12, the second locking portion 50b is housed in the second recess 42b. The second locking portion 50b is inserted into the second recess 42b from above. At this time, the inclined surface 541 contacts the inward surface 424 of the second recess 42b. When the second engaging portion 50b further moves downward, the inclined surface 541 is pushed toward the inner surface 424, and the elastic support portion 53 is elastically deformed radially inward. Thereby, the claw portion 54 of the second hooking portion 50b passes through the second recess 42b.

When the claw portion 54 moves below the lower surface of the circuit substrate 40, the elastic support portion 53 returns to the original shape. At this time, the contact surface 542 of the claw portion 54 contacts the lower surface of the circuit board 40. At this time, the lower surface of the insulator cylinder 246 is in contact with the upper surface of the circuit board 40.

When the claw portion 54 passes through the second recess 42b, the third outer surface 531 of the elastic support portion 53 contacts the third inner surface 425 of the second recess 42b, and the fourth outer surface 532 contacts the fourth inner surface 426. That is, at least one of the outer side surfaces (third outer side surface 531 and fourth outer side surface 532) is in contact with at least one of the inner side surfaces (third inner side surface 431 and fourth inner side surface 432) of the recess 42b. Thereby, the second locking portion 50b and the second recess 42b are positioned in the circumferential direction. The second hooking portion 50b is radially separated from the inward surface 424 of the second recess 42b.

In this way, the circuit board 40 is mounted on the stator 24 by housing the two engaging portions 50 in the corresponding recesses 42. Specifically, the lower surface of the insulator cylinder 246 is in contact with the upper surface of the circuit board 40. The contact surface 522 of the claw portion 52 of the first locking portion 50a and the contact surface 542 of the claw portion 54 of the second locking portion 50b are in contact with the lower surface of the circuit board 40. Thereby, the circuit board 40 is held by the insulator cylinder 246 and the latch 50.

The first outer surface 511 and the second outer surface 512 of the elastic support 51 of the first locking portion 50a contact the first inner surface 422 and the second inner surface 423 of the first recess 42a. Thereby, the first recess 42a is held in the circumferential direction with respect to the first hooking portion 50 a. The circuit board 40 is held by the contact between the first outer side surface 511 and the second outer side surface 512, which are inclined in the radial direction, and the first inner side surface 422 and the second inner side surface 423, which are also inclined in the radial direction. Therefore, even if there is a variation in the radial thickness of the first engaging portion 50a, the radial length of the first recess 42a, and the circumferential positions of the first inner surface 422 and the second inner surface 423, the circumferential positioning of the circuit board 40 can be accurately performed. Further, since the first and second inner surfaces 422 and 423 of the recess 42a and the first and second outer surfaces 511 and 512 of the locking portion 50a are formed in line symmetry, the circuit board 40 can be held with the same strength in the circumferential direction, and the contact force between the first and second inner surfaces 422 and 423 and the first and second outer surfaces 511 and 512 is substantially uniform when the locking portion 50a is fixed. Therefore, the positioning accuracy of the circuit board 40 in the circumferential direction can be improved.

The third outer surface 531 and the fourth outer surface 532 of the elastic support portion 53 of the second locking portion 50b contact the third inner surface 425 and the fourth inner surface 426 of the second recess 42b. Thereby, the second recess 42b is retained in the circumferential direction with respect to the second locking portion 50b. The circuit substrate 40 is held by the contact of the fourth outer side surface 532 inclined in the radial direction and the fourth inner side surface 426 also inclined in the radial direction. Therefore, even if there is a variation in the radial thickness of the second locking portion 50b, the radial length of the second recess 42b, and the circumferential positions of the third inner surface 425 and the fourth inner surface 426, the circuit board 40 can be accurately positioned. Further, since the third outer surface 531 is in contact with the third inner surface 425 of the second recess 42b, the movement of the circuit board 40 in the circumferential direction can be effectively restricted.

Since the circuit board 40 is held in the circumferential direction at two different positions in the circumferential direction, the movement in the circumferential direction is restricted. With this configuration, the circuit board 40 can be positioned in the circumferential direction with respect to the insulator 242 by the locking portion 50. Therefore, the member and the recess for positioning can be omitted.

By adopting the above configuration, the first outer side surface 511 and the second outer side surface 512 of the first engaging portion 50a are in contact with the first inner side surface 422 and the second inner side surface 423 of the first recess 42a in the circumferential direction, and the third outer side surface 531 and the fourth outer side surface 532 of the second engaging portion 50b are in contact with the third inner side surface 425 and the fourth inner side surface 426 of the second recess 42b in the circumferential direction. Therefore, the two latching portions 50a and 50b and the two recesses 42a and 42b can position the circuit board 40 in the circumferential direction with high accuracy. Therefore, the number of the engaging portions 50 and the recesses 42 can be reduced. By reducing the number of the recesses, the area of the circuit board 40 in which the recesses are formed can be reduced, the area of the portion where the wiring pattern is formed can be increased, and the degree of freedom of the wiring pattern can be increased.

Further, by making the two concave portions 42 and the two engaging portions 50 have different shapes, the circuit board 40 can be mounted on the stator 24 in a correct orientation and position.

Further, by making one inner side surface (third inner side surface 425) of the second recessed portion 42b parallel to the reference line Sb, the positioning accuracy in the circumferential direction of the inner side surface (third inner side surface 425) of the recessed portion 42b and the outer side surface (third outer side surface 531) of the click portion 50b can be improved.

The circumferential interval of the pair of inner side surfaces of the at least one recess 42 becomes narrower in the circumferential direction toward the radially outer side. With this configuration, the pair of inner side surfaces of the recess 42 contact the outer side surfaces of the locking portion 50, and the locking portion 50 is disposed inside the recess 42. Therefore, the engaging portion 50 easily enters the recess from the radially inner side, and workability improves.

<3.9 Structure of Wiring part 29 >

The wiring portion 29 protrudes radially outward from the radially outer edge of the housing 23 when viewed in the axial direction. The wiring section 29 has a wiring space 290 in which the lead 45 is disposed. That is, the motor 20 further includes a wiring unit 29, and the wiring unit 29 includes a wiring space 290 in which the lead wires 45 are arranged.

The wiring portion 29 has a first projection 291 and a second projection 292. As described above, the first projection 291 is formed integrally with the housing 23, and the second projection 292 is formed integrally with the hood 26. When the first projection 291 and the second projection 292 are vertically overlapped, a wiring space 290 extending in the radial direction is formed inside the wiring portion 29.

The wiring section 29 includes: a first projection 291 extending radially outward from a lower end of the housing 23; and a second protrusion 292 extending radially outward from the outer peripheral surface of the base 261.

More specifically, the first protrusion 291 includes a wiring top plate 2911 and a pair of wiring side walls 2912. The wiring portion top plate portion 2911 has a plate shape extending in a direction intersecting the central axis Cx. The wiring portion top plate 2911 is a rectangle extending in the axial direction when viewed from the axial direction. The pair of wiring portion side walls 2912 extend axially downward from both circumferential ends of the wiring portion top plate 2911. The wiring portion top plate portion 2911 and the pair of wiring portion side wall portions 2912 are integrally molded bodies. The axially lower surface of the first projection 291 is recessed axially upward and is recessed radially.

The second protrusion 292 is plate-shaped and extends in a direction intersecting the central axis Cx. The second protrusion 292 has a rectangular shape and is disposed axially opposite to the wiring portion top plate 2911 of the first protrusion 291.

The wiring portion 29 is disposed in contact with the axial lower ends of the pair of wiring portion side walls 2912 of the first protrusion 291. That is, the second protrusion 292 covers the recess of the lower surface of the first protrusion 291. Thus, a wiring space 290 extending in the radial direction is formed in the wiring portion 29. The wiring portion top plate 2911 is in close contact with the second protrusion 292. This can prevent foreign matter such as water, dust, and dirt from entering the wiring space 290 of the wiring unit 29. In addition, inflow of the airflow generated by the impeller 30 is also suppressed.

The wiring portion 29 formed in the case 23 and the base 261 holds the lead 45.

That is, the lead 45 is reliably held by the case 23 and the base 261. By reliably holding the lead 45, even when a force that pulls the lead 45 acts, the force acting on the lead 45 is applied to the wiring portion 29. Therefore, the force acting on the connection portion of the lead 45 and the circuit board 40 is reduced. This can prevent the lead 45 from coming off the circuit board 40.

A lead arrangement portion 103 for arranging the lead 45 is formed at a gap between the first frame portion 101 and the second frame portion 102 in the axial direction, and the lead arrangement portion 103 is connected to the wiring portion 29. With this configuration, the lead 45 can be stably held.

In addition, the first projection 291 may be in contact with at least the first frame portion 101. With this configuration, air leakage to the lead arrangement portion 103 can be suppressed.

<3.10 Structure of resin part 60 >

Stator 24 and circuit board 40 are disposed in a space surrounded by housing 23, bearing housing 22, and cover 26. After the stator 24 and the circuit board 40 are arranged at the correct positions, the molten resin is poured into the case 23. Then, the resin portion 60 is formed by curing the resin. That is, resin portion 60 covers stator 24 in a space surrounded by bearing housing 22, housing 23, and cover portion 26.

That is, in the motor 20 of the present embodiment, the stator 24 and the circuit board 40 housed in the case 23 are sealed by the resin portion 60. The motor 20 has the structure shown above.

In the motor 20, an upper end portion of the bearing housing 22 is held by the housing 23, and a lower end portion is held by the cover portion 26. Therefore, when the motor 20 is driven, the forces applied to the upper end portion and the lower end portion in the axial direction of the bearing housing 22 are balanced, and the vibration of the motor 20 is suppressed. When the bearing housing 22 and the cover 26 are connected, the base 261 and the bearing housing 22 are connected via the bush 262. Thus, deformation of the bearing housing 22 and the base 261 can be suppressed by a force acting when the bearing housing 22 and the cover 26 are connected.

<4. Construction of impeller 30 >

The impeller 30 includes an impeller hub 31 and a plurality of blades 32. The impeller 30 is, for example, an injection molded body of resin, but is not limited thereto. The impeller 30 is not limited to resin, and may be metal. The blades 32 may be formed separately from the impeller hub 31 and fixed by a fixing method such as bonding or welding.

As shown in fig. 1, 2, and the like, the impeller hub 31 includes a cover portion 311 and an impeller cylinder portion 312. The lid portion 311 has a disk shape expanding in the radial direction. The impeller cylinder 312 is a cylinder extending axially downward from the radially outer edge of the cover 311.

The rotor 25 is fixed to the inner circumferential surface of the impeller tube 312. Further, the outer peripheral surface of the rotor tube 253 of the rotor 25 is bonded to the inner peripheral surface of the impeller tube 312, whereby the impeller 30 and the rotor 25 are fixed. The impeller 30 and the rotor 25 are fixed to each other by bonding, but the present invention is not limited thereto. For example, a fixing method such as press fitting, welding, or screwing may be employed.

The plurality of blades 32 are arranged in a circumferential direction on the outer surface of the impeller hub 31. In the present embodiment, the blades 32 are arranged at equal intervals in the circumferential direction. In the impeller 30 of the air blower a of the present embodiment, the blades 32 and the impeller hub 31 are, for example, integrally molded bodies of resin. The upper portion of the blade 32 is arranged forward of the lower portion in the rotation direction Rd (see fig. 1).

<5. Process for producing Motor 20 >

Here, a manufacturing process of the blower a having the motor 20 will be described with reference to the drawings. Fig. 13 is a flowchart illustrating a manufacturing process of the blower device a. As shown in fig. 13, first, the upper end of the bearing housing 22 is press-fitted into the bearing housing mounting boss 233 of the lid portion 232 of the housing 23 (bearing housing mounting step: step S101). That is, the bearing housing mounting step S101 mounts the bearing housing 22 to the housing 23. Thereby, the bearing housing 22 is mounted to the housing 23.

The bearing 211 is mounted in advance on the bearing housing 22, and the shaft 21 is rotatably disposed via the bearing 211. Since the bearing housing mounting boss 233 penetrates in the axial direction, the upper end of the shaft 21 mounted to the bearing housing 22 protrudes upward beyond the upper end of the housing 23.

Further, the bearing housing 22 is in close contact with the bearing housing mounting boss 233. As a result, when resin is injected in the resin injection step S104 described later, leakage of resin from between the bearing housing 22 and the bearing housing mounting boss 233 can be suppressed.

In the present embodiment, the bearing 211 and the shaft 21 are mounted in advance on the bearing housing 22, but the present invention is not limited to this. For example, the bearing 211 and the shaft 21 may be attached at an appropriate timing after the bearing housing 22 is attached to the bearing housing attachment boss 233. However, the bearing 211 and the shaft 21 are attached to the bearing housing 22 and the bearing 211 by press fitting. Therefore, it is preferable that the bearing housing 22 is attached to the bearing housing attachment boss 233 in a state where the bearing 211 and the shaft 21 are attached to the bearing housing 22 in advance.

Then, the circuit board 40 is disposed on the stator 24 (circuit board mounting step: S102). In the circuit board mounting step S102, the engaging portion 50 of the stator 24 is inserted into the through hole 400 of the circuit board 40. The engaging portion 50 is fitted into the recess 42. Thereby, the circuit board 40 is positioned in the circumferential direction with respect to the stator 24.

The lower end portion of the insulator cylinder 246 of the insulator 242 contacts the upper surface of the circuit board 40, and the claw portions 52 and 54 of the locking portion 50 contact the lower surface of the circuit board 40. Thereby, the circuit board 40 is held. Then, the lead wires 247 at the end portions of the coil 243 are led to the lower surface side of the circuit board 40 via the cutout portions 43. The lead 247 is electrically connected to the pad 44 on the lower surface of the circuit board 40 (see fig. 7).

Next, the stator 24 with the circuit board 40 mounted thereon is housed inside the case 23. Fig. 14 is a sectional view of the housing 23 with the stator 24 and the circuit board 40 housed therein turned upside down. As shown in fig. 14, the inner peripheral surface of the core back 244 of the stator core 241 of the stator 24 is press-fitted and fixed to the outer peripheral surface of the bearing housing 22 (stator mounting step: step S103). That is, in the stator mounting step (step S103), the stator 24 is mounted on at least one of the housing 23 and the bearing housing 22. Further, after the circuit board arranging step (step S102), a stator mounting step (step S103) is performed.

In the motor 20 of the present embodiment, the inner peripheral surface of the core back 244 of the stator 24 is fixed in contact with the outer peripheral surface of the bearing housing 22, but the present invention is not limited to this. The radially outer edge of the tooth 245 of the stator 24 may be fixed in contact with the inner circumferential surface of the cylindrical portion 231 of the housing 23. Alternatively, both may be fixed in contact with each other.

The circuit board 40 is mounted with a lead 45. When the circuit board 40 is housed in the case 23, the lead 45 is disposed in a recess formed in a lower portion of the first projection 291 in the radial direction, and the first projection 291 projects radially outward from the case 23.

In the manufacturing process of the present embodiment, after the circuit board 40 is mounted on the stator 24 in the circuit board mounting step S102, the stator 24 is mounted on the housing 23 in the stator mounting step S103. However, the order is not limited thereto. That is, the stator 24 may be mounted to the housing 23 in the stator mounting step, and then the circuit board may be mounted to the stator 24 in the circuit board mounting step. Thus, even if the order is reversed, the notch 43 is formed in the outer peripheral surface of the circuit board 40, and the lead 247 is routed to the lower side of the circuit board 40 through the notch 43. Therefore, the handling of the lead wires 247 is facilitated, and workability can be improved.

As described above, the stator 24 and the circuit board 40 are mounted inside the housing 23. Next, the housing 23 containing the stator 24 and the circuit board 40 therein is turned upside down and held, and resin is injected from the opening 230 positioned at the upper portion (resin injection step: step S104). That is, in the resin injection step (step S104), resin is injected from the opening 230 at the lower end portion in the axial direction of the housing 23, and the stator 24 is covered with resin.

In the resin injection step S104, the case 23 is disposed in the decompression region Dp. The reduced pressure region is a region lower than the atmospheric pressure. For example, an internal region of a container, such as a vacuum chamber, which can be depressurized therein may be used. The case 23, the stator 24, and the circuit board 40 of fig. 14 are located in the decompression region Dp. Then, in the decompression region Dp, a resin having fluidity is injected into the case 23.

When the resin having fluidity is caused to flow into the case 23, it is necessary to suppress the resin having fluidity from overflowing from the case 23. As described above, the cylinder portion 231 of the housing 23 has the first projecting portion 291 extending radially outward. The first protrusion 291 is opened radially outward to form a wiring space.

When the resin having fluidity flows into the housing 23 from the opening 230, the flow is stopped before the liquid surface of the resin having fluidity reaches the upper end portion of the inner peripheral surface of the first protrusion 291. This can prevent the resin having fluidity from overflowing from the case 23.

As shown in fig. 14, in the case 23, a boundary line 23L of the resin having fluidity is determined. In the stator mounting step S103, when the stator 24 is mounted to the housing 23, the electronic component 41 mounted on the circuit board 40 is positioned on the inner side of the housing 23, that is, on the upper side of the limit line 23L. That is, in the resin injection step (step S104), the liquid surface of the resin injected into the case 23 with the opening 230 directed upward is positioned above the upper end of the electronic component 41 mounted on the circuit board 40. With this configuration, the circuit board 40 and the electronic component 41 mounted on the circuit board 40 are sealed together with the stator 24 by the resin portion 60, and therefore, the circuit board 40 and the electronic component 41 can be prevented from being waterproofed and from coming into contact with foreign matter.

As shown in fig. 14, the boundary line 23L is set above the opening 230. That is, the lower end portion (end portion on the cover portion 26 side) of the resin portion 60 is positioned above the opening portion 230 of the case 23 (on the side opposite to the cover portion 26). With this configuration, the resin can be prevented from overflowing due to expansion and contraction during molding of the resin portion 60. In addition, cover 26 can be reliably attached to opening 230.

Then, in resin injection step S104, in case 23 turned upside down, resin having fluidity is injected until the upper end face is located above the upper end of electronic component 41 and below critical line 23L. That is, in the resin injection step (step S104), the resin is injected in a state in which the opening 230 of the case 23 is directed upward, and the injection of the resin is terminated while the upper surface of the resin injected into the case 23 is positioned below the upper limit (the limit line 23L) of the liquid surface that can be stored in the case 23. This can prevent the resin from overflowing from the case 23 when the resin is injected into the case 23. When cover 26 is attached to case 23, interference between resin portion 60 and cover 26 can be suppressed, and cover 26 can be accurately attached to case 23.

Thereby, the stator 24, the circuit board 40, and the electronic component 41 mounted with the circuit board 40 are reliably covered with the resin having fluidity. At this time, the resin having fluidity may cover the leads 45 disposed on the first protrusion 291.

When the resin having fluidity is injected, cover 26 is not attached to opening 230. For example, as compared with the case where a resin injection port is provided in the lid portion 26, a resin having fluidity can be injected from the larger opening portion 230. Therefore, the inflow amount of the resin having fluidity per unit time can be increased, and the resin injection can be completed in a short time. Therefore, the start of partial curing in the middle of injection can be suppressed, and unevenness in curing can be suppressed.

Further, since the opening 230 is large and injection is performed in the reduced pressure region Dp, air in the case 23 during resin injection is easily discharged, and a defect of the resin portion 60 formed by curing the resin is not easily formed.

Further, since the resin having fluidity flows into the decompression region Dp, even if bubbles exist in the resin filled in the case 23, the bubbles are compressed when returning to the atmospheric pressure. Therefore, the ratio of air bubbles in the resin portion 60 can be reduced, and a decrease in the rigidity of the resin portion 60 can be suppressed.

Next, after filling the case 23 with the resin, the resin is cured (resin curing step S105). That is, after the resin injection step (step S104), there is also a resin curing step (step S105) of curing the injected resin. That is, before cover 26 is mounted, case 23 can be easily moved. This can improve the work efficiency in manufacturing.

The resin curing step S105 may be performed in the reduced pressure region Dp, or may be performed in an atmosphere of atmospheric pressure. In the resin curing step S105, the resin may be heated or irradiated with ultraviolet rays. A treatment corresponding to the curing characteristics of the resin used is carried out.

In the resin curing step S105, the resin is cured to complete the resin portion 60. At this time, the electronic component 41 is disposed on the lower surface of the circuit board 40, and the lower end of the electronic component 41 is located above the lower end of the resin portion 60. By completing the resin portion 60, it is possible to prevent foreign matter such as water, dust, and dirt from coming into contact with the stator 24, the circuit board 40, and the electronic component 41 mounted on the circuit board 40. That is, the waterproof and dustproof performance of the stator 24, the circuit board 40, and the electronic component 41 can be improved.

Thereafter, the lower end portion of bearing housing 22 is press-fitted into bush 262 of cover portion 26 (cover step: step S106). That is, the covering step (step S106) is performed after the resin injection step (step S104) by covering the opening portion 230 of the case 23 with the cover portion 26.

After resin is injected from opening 230 at the lower end of case 23, cover 26 is attached. Further, since the opening 230 is the entire lower end portion of the housing 23, the resin can be more easily introduced than in the case where an inlet is formed in the cover portion 26 and the resin is injected from the inlet. Therefore, the resin can be spread over a deep portion or a narrow region, and generation of voids not filled with the resin can be suppressed.

Cover 26 covers opening 230 at the lower end of case 23. Thereby, the opening 230 of the case 23 is closed by the cover 26. A cap 263 is attached to the lower end of the cover 26. A part of the cap 263 is inserted into the lower end of the bearing housing 22 to seal the bearing housing 22. This can prevent foreign matter such as water, dust, and dirt from entering the bearing 211.

When cover 26 covers opening 230 of case 23, second protrusion 292 formed integrally with cover 26 covers the lower portion of first protrusion 291. Thus, a wiring space 290 in which the lead 45 is arranged is formed inside the wiring portion 29. The upper ends of base 261 and bushing 262 of cover 26 are disposed below the lower end of resin portion 60. This can suppress interference between cover portion 26 and resin portion 60.

In the present embodiment, cover 26 is integrally formed with second frame portion 102 of frame 10 of blower a. Therefore, in the covering step S106, the housing 23 having the resin portion 60 formed therein is disposed inside the second frame portion 102, and the lower end portion of the bearing housing 22 is press-fitted into the bush 262. That is, the cover portion 26 is integrally formed with the bush 262 on the radial inner side of the annular base 261, and in the cover step (step S106), the lower end portion of the bearing housing 22 is press-fitted into the bush 262.

Since the metal bearing housing 22 is press-fitted into the bush 262, which is also made of metal, the bearing housing 22 can be firmly fixed to the cover portion 26. In other words, the mounting rigidity of the bearing housing 22 to the cover 26 can be improved. This can suppress inclination and wobbling of the shaft 21 with respect to the central axis Cx.

Then, the upper end of the shaft 21 protruding from the upper end of the bearing housing 22 is press-fitted into the shaft fixing boss 255 of the rotor 25, and the rotor 25 is mounted on the shaft 21 (rotor mounting step: step S107). Thus, the magnet 252 of the rotor 25 is disposed at a predetermined distance radially outward of the stator 24. The motor 20 is formed in the above order.

Then, the impeller cylinder portion 312 of the impeller 30 is bonded to the outer peripheral surface of the rotor cylinder portion 253 of the rotor 25, and the impeller 30 is fixed to the rotor 25 (impeller fixing step: step S108).

Then, the first frame part 101 is superposed on the upper part of the second frame part 102, and the first frame part 101 and the second frame part 102 are fixed to complete the frame 10 (frame assembling step: step S109). When the first frame portion 101 is fixed above the second frame portion 102, a lead arrangement portion 103 formed by the first frame portion 101 and the second frame portion 102 is formed on the frame 10. Further, the lead 45 is disposed in the lead disposing part 103. The lead wire 45 is routed to the outside of the blower a via the wiring unit 29 and the lead wire placement unit 103. This allows the current from the power supply device outside the air blower a and the control signal from the external device to be transmitted to the circuit board 40.

By using the method of manufacturing motor 20 of the present embodiment, resin having fluidity can be poured in before cover 26 is mounted on housing 23. This enables the resin to flow into the case 23 quickly before the resin is solidified to have a high viscosity. Therefore, the resin can be spread widely inside the housing 23, and formation of a space where no resin is disposed can be suppressed.

Further, when the resin is introduced, the atmosphere is reduced in pressure from the atmospheric pressure, and thus the air inside the case 23 is easily discharged to the outside when the resin is introduced. This also suppresses formation of a space where no resin is disposed. The resin is poured in a reduced pressure environment and cured in an atmospheric pressure environment, so that the atmospheric pressure is higher than the pressure of the air in the resin. Therefore, the bubbles formed inside the resin can be reduced. This can suppress a decrease in the rigidity of the resin portion 60 after the resin is cured. Further, since the formation of holes due to bubbles can be suppressed, the waterproof, dustproof, and explosion-proof properties of the motor 20 can be improved.

<6. Modified examples, etc. >

Fig. 15 is a plan view showing a recess 46 and a locking portion 55 according to a modification. As shown in fig. 15, the circumferential widths of the inner side surfaces 461 and 462 of the recess 46 are wider toward the radially outer side. That is, the circumferential interval of the pair of inner side surfaces 461, 462 of the at least one recess 46 becomes wider in the circumferential direction toward the radially outer side. The circumferential widths of the outer surfaces 551 and 552 of the locking portion 55 are also increased toward the radial outer side, similarly to the inner surfaces 461 and 462.

Even in the case of using such a structure, the same effect as in the case of using the concave portion 42 and the locking portion 50 can be obtained.

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

The utility model discloses an air supply arrangement can be used for the air supply arrangement that cooling etc. of electrical equipment used etc..

Description of the symbols

A air supply device

10. Frame structure

101. First frame part

102. Second frame part

103. Lead arrangement part

11. Frame main body

111. Mounting hole

12. Wind tunnel part

121. Air inlet

122. Exhaust port

13. Stationary blade

20. Motor with a stator having a stator core

21. Shaft

211. Bearing assembly

22. Bearing housing

221. Bearing holding part

23. Shell body

23L critical line

230. Opening part

231. Cylinder part

232. Cover part

233. Bearing housing mounting boss

24. Stator with a stator core

241. Stator core

242. Insulator

243. Coil

244. Iron core back

245. Toothed section

246. Insulator barrel

247. Conducting wire

248. Lead-out part

25. Rotor

251. Rotor cover

252. Magnet body

253. Rotor barrel

254. Rotor top plate part

255. Shaft fixing boss

26. Cover part

261. Base seat

262. Bush

263. Cap part

29. Wiring part

290. Wiring space

291. First protruding part

2911. Top board of wiring part

2912. Side wall part of wiring part

292. Second protrusion

30. Impeller

31. Impeller hub

311. Cover part

312. Impeller barrel part

32. Blade

40. Circuit board

400. Through hole

41. Electronic component

42. Concave part

42a first recess

421. Inward facing surface

422. A first inner side surface

423. Second inner side surface

42b second recess

424. Inward facing surface

425. Third inner side surface

426. The fourth inner side surface

43. Cut-out part

44. Bonding pad

45. Lead wire

50. Fastening part

50a first fastening part

51. Elastic support part

511. First outer side surface

512. Second outer side surface

52. Claw part

521. Inclined plane

522. Contact surface

50b second latch part

53. Elastic support part

531. Third outer side

532. Fourth outer side surface

54. Claw part

541. Inclined plane

542. Contact surface

60. Resin part

Cx center axis

Dp reduced pressure region

Direction of rotation of Rd

Sd reference line.

Claims (7)

1. A motor, comprising:

a stator core centered on a central axis extending vertically;

an insulator covering at least a portion of the stator core;

a coil formed by winding a wire around the insulator; and

a circuit board disposed on one axial side of the stator core and electrically connected to the coil,

the circuit board includes:

a through hole formed in the central portion when viewed in the axial direction; and

a plurality of recessed portions recessed radially outward from an edge portion of the through-hole,

the insulator has a locking portion extending toward the circuit board side in an axial direction and received in the recess of the circuit board,

the recess has a pair of inner side surfaces opposed in a circumferential direction,

the circumferential interval of the pair of inner side surfaces becomes narrower toward one radial side,

the buckling part is provided with outer side faces arranged at two ends in the circumferential direction,

the outer side surface has an inclination that contacts a surface of at least one of the inner side surfaces of the recess.

2. The motor of claim 1,

the insulator is provided with two buckling parts,

the circuit substrate has two of the concave portions.

3. The motor of claim 1,

at least one of the recesses has a shape in an axial plan view different from the other recesses.

4. The motor of claim 1,

the pair of inner side surfaces of at least one of the concave portions is arranged line-symmetrically with respect to a reference line that passes through a center of the through-hole and a circumferential center of the concave portion and extends in a radial direction.

5. The motor of claim 1,

the circumferential interval of the pair of inner side surfaces of at least one of the recesses becomes narrower in the circumferential direction toward the radially outer side.

6. The motor of claim 1,

the circumferential interval of the pair of inner side surfaces of at least one of the recesses becomes wider in the circumferential direction toward the radially outer side.

7. An air blowing device is characterized by comprising:

the motor of any one of claims 1 to 6; and

an impeller mounted to the motor.

Images