JP2022045045A - Centrifugal fan - Google Patents

Abstract

To provide a centrifugal fan capable of improving its working efficiency by reducing a step of reversing work without lowering the stiffness of a lower casing.SOLUTION: In the centrifugal fan, a stator core 161 and a circuit board 135 are stored between an upper casing and a lower casing 130, an upper side insulator is provided on the upper side of the stator core 161, a lower side insulator is provided on the lower side of the stator core 161, a coil 163 is wound on the salient pole of the stator core 161 via the upper and lower insulators, the circuit board 135 is arranged on the lower side of the lower side insulator, and the stator core 161 and the circuit board 135 are stored in a recessed part 134 of the lower casing 130. A terminal 163a of the coil 163 is guided into a groove provided in the outer periphery rib of the lower side insulator, and pulled out on a land part 135c formed on the circuit board 135 for solder joint.SELECTED DRAWING: Figure 6

Description

The present invention relates to a centrifugal fan, and more particularly to a technique for simplifying the work of soldering a coil to a circuit board of a terminal.

Conventionally, as this type of centrifugal fan, for example, the centrifugal fan disclosed in Patent Document 1 is known. In this centrifugal fan, as shown in FIGS. 15 and 16, when the lower casing 240 is molded, the connector housing 261 is formed by integrally molding the resin at the same time. The connector pin 262 is mounted inside the connector housing 261, and the connector pin 262 is soldered to the wiring pattern of the circuit board 232 arranged in the recess 241 of the lower casing 240.

In this centrifugal fan, as shown in FIG. 16, the resin pin 294 formed on the lower surface of the lower insulator 292 is inserted into the through hole 234 formed in the circuit board 232, and the terminal of the coil 293 is formed in the circuit board 232. It is inserted through the through hole 233. Then, the terminal of the coil 293 protruding from the through hole 233 is solder-bonded to form a solder-bonded portion 237, and a stator assembly in which the circuit board 232 is mounted on the lower surface of the lower insulator 292 is obtained.

Then, the stator core 251 which is the main component of the stator assembly is fitted into the bearing holder 245, the resin pin 294 is inserted into the through hole 253 formed in the lower casing 240, and the resin protruding from the through hole 253 of the lower casing 240. The circuit board 232 is fixed to the lower casing 240 by plastically deforming the tip of the pin 294 to form the pin welded portion 294a. A relief portion 241a is formed in the lower casing 240 at a position corresponding to the solder joint portion 237, and the solder joint portion 237 is housed in the relief portion 241a. Further, Patent Document 1 shows an example in which a through hole 254 is formed in the lower casing 240 in place of the relief portion 241a (see FIG. 17).

Japanese Unexamined Patent Publication No. 2018-200048

However, in Patent Document 1, in order to obtain a stator assembly in which the circuit board 232 is mounted on the lower surface of the lower insulator 292, the terminal of the coil 293 protruding from the through hole 233 by inverting the circuit board 232 together with the stator core 251 is used. It requires work to connect with solder. In addition, when mounting the stator assembly to the lower casing 240, the lower casing 240 is inverted and the tip of the resin pin 294 protruding from the through hole 253 is plastically deformed by infrared caulking, thermal caulking, etc. to pin the pin. It is necessary to form the welded portion 294a and mount the circuit board 232 on the lower casing 240. As described above, in Patent Document 1, there is a problem that the work efficiency is low because the step of inverting the parts and working is required twice.

On the other hand, in the example of Patent Document 1 shown in FIG. 17, the terminal of the coil 293 and the resin pin 294 are inserted into the through holes 233 and 234 formed in the circuit board 232 and the through holes 254 and 253 formed in the lower casing 240, respectively. , The lower casing 140 is inverted and the tip of the resin pin 194 protruding from the back surface of the lower casing 140 is plastically deformed to form the pin welded portion 194a, and the terminal of the coil 193 is a through hole formed in the lower casing 140. It is solder-bonded to the circuit board 132 inside the 154.

Therefore, in the example shown in FIG. 17, the step of inverting the lower casing 240 and performing the work may be performed once, but the terminal of the coil 293 is solder-bonded inside the through hole 254 formed in the lower casing 240. Is required. In this way, since the solder joining work is performed inside the through hole 254, it is necessary to increase the diameter of the through hole 254. However, if the diameter of the through hole 254 is increased, the rigidity of the lower casing 240 and the natural frequency are increased. As a result, there is a risk of causing vibration and noise of the centrifugal fan.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a centrifugal fan capable of reducing the steps of reversing work and improving work efficiency without lowering the rigidity of the lower casing. do.

In the present invention, the stator core and the circuit board are housed between the first casing and the second casing, the first insulator is provided on one end side in the axial direction of the stator core, and the second insulator is provided on the other end side in the axial direction of the stator core. A coil is wound around the salient pole of the stator core via the first and second insulators, a circuit board is arranged on the other end side in the axial direction of the second insulator, and the stator core and the circuit board are placed in the second casing. The centrifugal fan housed in the recess of the coil, the terminal of the coil is guided by a guide portion provided in the second insulator, pulled out onto a land portion formed on the circuit board, and solder-bonded. It is a centrifugal fan.

In the centrifugal fan having the above configuration, the terminal of the coil is guided by the guide portion provided in the second insulator when obtaining the stator assembly in which the circuit board is provided on the other end side in the axial direction of the second insulator. Since it is drawn out onto the land portion formed on the circuit board and solder-bonded, it is not necessary to invert the circuit board together with the stator core for solder-bonding. Therefore, not only the step of the reversing work is reduced, but also the solder bonding can be performed on the surface of the circuit board instead of in the through hole that reduces the rigidity of the second casing.

Here, it is preferable that the second insulator is provided with an outer peripheral rib that comes into contact with the circuit board, and is provided with a groove as a guide portion on the axial end surface of the outer peripheral rib. According to such an embodiment, since the opening of the groove is closed by the circuit board, the end of the coil is held in the groove, and even if an external force is applied to the coil, the end of the coil is difficult to move and the solder joint is damaged. hard.

Further, a configuration in which a resin pin for fixing the circuit board to the second casing is provided on the axial end surface of the outer peripheral rib is preferable. According to such an aspect, since the second insulator is supported on the circuit board by the outer peripheral rib and fixed to the second casing at that position, the second insulator is stably supported.

The groove has a substantially arcuate shape extending from the inner peripheral side of the outer peripheral rib toward the side surface, and the land portion formed on the circuit board is located at a position corresponding to the middle of the adjacent salient poles of the stator core. The configuration arranged in is preferable. According to such an aspect, since one end side of the land portion in the axial direction is open, the solder joining work can be easily performed.

Alternatively, in the above embodiment, the groove has a substantially linear shape extending from the inner peripheral side to the outer peripheral side of the outer peripheral rib, and the land portion formed on the circuit board is located at a position on the radial outer side of the outer peripheral rib. It can also be placed. In such an embodiment, since the end portion of the coil is linear from the groove to the land portion, there is an advantage that the stress applied to the coil is small and the solder joint at the land portion is unlikely to be damaged.

According to the present invention, it is possible to provide a centrifugal fan capable of reducing the steps of reversing work and improving work efficiency without lowering the rigidity of the lower casing.

It is a top view which shows the centrifugal fan of 1st Embodiment. FIG. 3 is a cross-sectional view taken along the line AA of FIG. It is a cross-sectional view which expanded the main part of FIG. It is a top view which shows the lower casing of the centrifugal fan of 1st Embodiment. It is a back view which shows the lower casing of the centrifugal fan of 1st Embodiment. It is a perspective view which shows the state which attached the circuit board and the stator to the lower casing of the centrifugal fan of 1st Embodiment. It is a top view which shows the state which attached the circuit board and the stator to the lower casing of the centrifugal fan of 1st Embodiment. It is a perspective view which shows the lower insulator of the centrifugal fan of 1st Embodiment. FIG. 3 is an enlarged perspective view of a portion indicated by an arrow B in FIG. FIG. 3 is an enlarged perspective view of a portion indicated by an arrow C in FIG. It is a perspective view which shows the state which attached the circuit board and the stator to the lower casing of the centrifugal fan of 2nd Embodiment. It is a top view which shows the state which attached the circuit board and the stator to the lower casing of the centrifugal fan of 2nd Embodiment. It is a perspective view which shows the lower insulator of the centrifugal fan of 2nd Embodiment. FIG. 3 is an enlarged perspective view of a portion indicated by an arrow D in FIG. It is sectional drawing which shows the conventional centrifugal fan disclosed in Patent Document 1. FIG. It is another cross-sectional view which shows the conventional centrifugal fan. It is sectional drawing which shows the other conventional centrifugal fan.

1. 1. First Embodiment [1] Overall Structure of Centrifugal Fan FIG. 1 is a plan view of the centrifugal fan 100 of the first embodiment of the present invention, and FIG. 2 is a cross-sectional view including a center of a shaft 125 which is a rotation axis. The centrifugal fan 100 includes a casing 150 composed of an upper casing (first casing) 110 and a lower casing (second casing) 130 having a substantially disk shape. In the description of the embodiment, the description of "upper" and "lower" attached to the constituent elements indicates the direction in FIG. 2 and the like, and does not specify the posture of the centrifugal fan 100 in the actual machine.

The upper casing 110 is made of resin, and a suction port 111 is formed in the center thereof. Further, on the outer periphery of the upper casing 110, flanges 112 having a substantially triangular shape protruding outward in the radial direction are formed at four places thereof. As shown in FIG. 1, on the upper surface of the upper casing 110, a plurality of radial ribs 113 and one concentric rib 114 connecting the radial ribs 113 are formed on the outer peripheral side thereof, and a plurality of radial ribs 114 are also formed on the inner peripheral side thereof. One concentric rib 116 connecting the radial ribs 115 and those radial ribs 115 is formed.

A column 140 extending downward in FIG. 2 is integrally formed on the flange 112. It is also possible to form a counterbore on the lower surface of the flange 112, fit the support column 140 into the hole, and attach the support by means such as adhesion. The upper casing 110 and the lower casing 130 are connected to each other by a support column 140.

In this embodiment, a through hole 112a is formed in the flange 112 and the support column 140, the lower end surface of the support column 140 abuts on the bottom surface of the lower casing 130, and the through hole 130a formed in the lower casing 130 (see FIGS. 4 and 5). The fastener 140a is inserted into the fastener 140a, and the fastener 140a is screwed into the through hole 112a of the column 140, so that the upper casing 110 and the lower casing 130 are connected via the column 140. Even if a boss is formed on the lower surface of the support column 140, the boss is inserted into the through hole 130a of the lower casing 130, and the tip of the boss protruding from the through hole 130a is plastically deformed by heat caulking or infrared caulking to join. good.

The portion of the side surface of the casing 150 excluding the support column 140 is a gap between the upper casing 110 and the lower casing 130, and this gap portion is the ejection port 111a. A resin impeller 120 is housed between the upper casing 110 and the lower casing 130 in a rotatable state.

The impeller 120 includes a cup-shaped hub 121, a plurality of blades 122 extending radially outward from the vicinity of the outer periphery of the upper surface of the hub 121, and a disk-shaped main plate 123 arranged at the lower end of the blades 122. , It is composed of an annular shroud 124 arranged at the upper end of the blade 122. The blades 122 all have the same shape and are evenly arranged in the circumferential direction. The hub 121, the blade 122, the main plate 123, and the shroud 124 are integrally formed by injection molding of resin. The blade 122 rotates in the clockwise direction in FIG. 1 to eject air outward in the radial direction.

An annular yoke 127 and an annular magnet 128 serving as a rotor magnet are arranged on the inner peripheral surface of the cylindrical portion formed on the lower surface side of the hub 121 of the impeller 120. Inside the annular magnet 128 (on the axis center side), the stator core 161 is arranged via a predetermined gap. The stator core 161 is made by laminating thin plate-shaped soft magnetic materials such as electromagnetic steel sheets, and is configured by projecting a plurality of salient poles 161b radially outward from the annular core back 161a as shown in FIG. ..

A resin insulator 300 having a vertically split structure is mounted on the stator core 161, and a coil 163 is wound around each salient pole 161b of the stator core 161 via the insulator 300. The configuration of the insulator 300 will be described in detail later.

As shown in FIGS. 4 to 7, the lower casing 130 has a dish-shaped structure made of resin and has a recess 134. The recess 134 is provided with a step portion 134a whose one side is raised by one step. A circuit board 135 having a similar shape to the recess 134 is housed in the recess 134. The circuit board 135 includes a drive circuit that supplies a drive current to the coil 163. The circuit board 135 is provided with an opening 135b through which the protrusion 132 of the lower casing 130 penetrates in the center (see FIG. 3), and the wiring pattern, electronic components, control circuit, connector pin insertion hole, and the like are described in detail later on the upper surface thereof. Land part is formed.

As shown in FIG. 3, an annular protrusion 132 that projects upward is formed in the central portion of the lower casing 130. A bearing holder 170 made of metal (for example, brass) having a tubular shape is fixed to the protrusion 132 by insert molding. The above-mentioned stator core 161 is fitted on the outer periphery of the bearing holder 170. A step portion 170a protruding in the radial direction is provided on the outer peripheral surface of the bearing holder 170, and an inner peripheral portion of the stator core 161 is placed on the step portion 170a.

The stator 160 is composed of a stator core 161 and an insulator 300 and a coil 163. Further, the rotor 129 is composed of a shaft 125, an annular yoke 127 and a magnet 128. In this way, the stator 160 and the rotor 129 form an outer rotor type brushless DC motor.

As shown in FIG. 3, a pair of ball bearings 181 and 182 are arranged inside the bearing holder 170 so as to be separated in the vertical direction, and the shaft 125 is rotatably supported by the ball bearings 181 and 182. The shaft 125 is integrally molded with the hub 121 of the impeller 120 by insert molding. Therefore, the impeller 120 rotates together with the rotor 129.

As shown in FIG. 4, on the bottom surface of the lower casing 130, a plurality of concentric ribs 137 connecting the plurality of radial ribs 136 and the radial ribs 136 are formed. At the outer peripheral end of the radial rib 136, a triangular rib 136a joined to the side wall of the recess 134 is formed (see FIGS. 4 and 6). Further, as shown in FIG. 5, a plurality of triangular ribs 139 are formed on the back surface of the lower casing 130.

Further, as shown in FIG. 4, a circular convex portion 138 in a plan view is formed in the vicinity of the center of the lower casing 130 so as to overlap and integrally fuse with the radial rib 136 and the concentric rib 137 in a plan view. ing. The convex portion 138 is formed with a through hole 138a that penetrates to the back surface of the lower casing 130. The circuit board 135 is supported by the convex portion 138.

As shown in FIG. 2, a connector housing 190 is integrally molded with the lower casing 130 on the side of the lower casing 130. The connector housing 190 has a rectangular shape when viewed from the side, and an opening 191 is formed on the side surface thereof. Inside the connector housing 190, one end of a plurality of connector pins 192 integrally molded by insert molding with the lower casing 130 projects. The connector pin 192 has an L-shape, and the other end extends upward and protrudes through the circuit board 135. The connector pin 192 is soldered to the circuit board 135 and connected to the drive circuit wired to the circuit board 135. In FIG. 2, reference numeral 196 is a rib that reinforces the connector housing 190.

[2] Configuration around the insulator The insulator 300 is composed of an upper insulator (first insulator) 310 and a lower insulator (second insulator) 320. FIG. 8 is a perspective view of the lower insulator 320 turned upside down. The lower insulator 320 is made of resin and has a cylindrical portion 321 extending in the axial direction in the center thereof. A plurality of slits 322 (six places in this example) are formed in the cylindrical portion 321 in the circumferential direction. The slit 322 is formed on a line connecting the center of the slot 161c (see FIG. 10) formed between the adjacent salient poles 161b and the center of the axis.

Triangular ribs 132a formed on the outer peripheral surface of the protrusion 132 of the lower casing 130 are inserted into each of the slits 322 (see FIGS. 3 and 10). The triangular rib 132a is a portion at the base of the radial rib 136, and a portion extending radially outward from the triangular rib 132a is the radial rib 136. The insertion of the triangular rib 132a into the slit 322 also serves as the positioning of the stator core 151.

Since the triangular rib 132a is located in the center of the slot 161c when viewed from the direction perpendicular to the axis, the triangular rib 132a avoids interference (contact) with the coil 163 (see FIG. 3, not shown in FIG. 10). The dimensions of can be increased. As a result, the rigidity of the lower casing 130 and the rigidity of the integrated structure of the lower casing 130 and the bearing holder 170 can be increased.

The cylindrical portion 321 of the lower insulator 320 is formed with a plurality of protrusions 323 protruding outward in the radial direction in the circumferential direction. At the tip of the protrusion 323, an arc portion 324 extending in the circumferential direction is formed. The inside of the protrusion 323 and the arc 324 is hollow, and the salient pole 161b of the stator core 161 is accommodated therein.

A rectangular outer peripheral rib 325 that prevents the coil 163 from unwinding is formed on the lower surface of the arc portion 324. The outer peripheral rib 325 serves as a support portion that is placed on the circuit board 135 to support the stator 160 when the stator 160 is attached to the lower casing 130, and a resin pin 326 is formed in the center thereof. As shown in FIG. 3, the resin pin 326 is passed through the through hole 135a formed in the circuit board 135 and the through hole 138a formed in the convex portion 138 of the lower casing 130, and the tip portion protruding from the through hole 138a is thermally caulked. , Or by crushing by means such as infrared caulking, the lower casing 130 is attached.

As shown in FIGS. 6 and 7, a land portion 135c is provided on the upper surface of the circuit board 135 at the center of the slot 161c. The land portion 135c exposes the metal connected to the wiring pattern of the circuit board 135, and the terminal 163a of the coil 163 is solder-bonded to the land portion 135c. The terminal 163a of the coil 163 is guided to the land portion 135c by a groove (guide portion) 327 formed in the outer peripheral rib 325.

As shown in FIG. 9, a substantially arc-shaped groove 327 extending from the inner peripheral surface 325a of the outer peripheral rib 325 toward the side surface 325b is formed on one shoulder portion of the outer peripheral rib 325. Since the lower end surface 325c of the outer peripheral rib 325 is in contact with the circuit board 135, the groove 327 has a tunnel shape, and the terminal 163a of the coil 163 is held therein.

[3] Assembly Procedure Next, a procedure for accommodating and attaching the circuit board 135 and the stator core 161 to the bottom surface of the recess 134 of the lower casing 130 will be described. First, the bearing holder 170 is inserted through the opening 135b of the circuit board 135, and the connector pin 192 protruding from the bottom surface of the recess 134 of the lower casing 130 is inserted into the connector pin insertion hole (not shown) formed in the circuit board 135. do. Then, the through hole 135a for inserting the resin pin 326 formed in the circuit board 135 and the through hole 138a for inserting the resin pin 326 formed in the bottom surface of the recess 134 of the lower casing 130 substantially overlap in the axial direction. (See FIG. 3).

Next, the resin pin 326 formed on the outer peripheral rib 325 on the lower surface of the lower insulator 320 mounted on the lower end surface of the stator core 161 was formed in the through hole 135a formed in the circuit board 135 and the lower casing 130. It is inserted through the through hole 138a and engaged with the slit 322 formed in the cylindrical portion 321 of the lower insulator 320 and the triangular rib 132a formed on the outer peripheral side (the root side of the radial rib 136) of the protrusion 132 of the lower casing. (See FIG. 10), the annular core back 161a of the stator core 161 is fitted to the bearing holder 170.

At this time, the land portion 135c formed on the circuit board 135 is arranged in the central portion of the slot 161c, and the terminal 163a of the coil 163 drawn from the groove 327 of the outer peripheral rib 325 is the land portion formed on the circuit board 135. It is placed on 135c. The terminal 163a of the coil 163 mounted on the land portion 135c is solder-bonded to the land portion 135c from above without inverting the stator core 161 and the circuit board 135. Further, the connector pin 192 inserted into the connector pin insertion hole of the circuit board 135 is solder-bonded. The terminal 163a of the coil 163 located on the land portion 135c formed on the circuit board 135 is solder-bonded to the land portion 135c without inverting the stator core 161. Can be improved.

Next, the lower casing 130 is inverted, and the tip of the resin pin 326 protruding from the back surface of the recess 134 of the lower casing 130 is plastically deformed by infrared caulking, heat caulking, etc. to fix the circuit board 135 to the lower casing 130. As described above, the circuit board 135 and the stator core 161 are accommodated and attached to the bottom surface of the recess 134 of the lower casing 130. The following is a procedure for completing the centrifugal fan 100.

Bearings 181, 182 are mounted on the bearing holder 170, and the impeller 120 in which the shaft 125 is insert-molded is rotatably supported by the bearings 181, 182. Next, the upper casing 110 having the suction port 111 formed in the center is attached. The upper casing 110 and the lower casing 130 are connected to each other by using four columns 140 integrally formed with the upper casing 110. Specifically, a fastening member 140a such as a bolt is inserted into a through hole 130a (see FIGS. 4 and 5) formed in the lower casing 130, and is screwed into a support column 140 to be connected. Alternatively, a cylindrical convex portion formed on the lower end surface of each column 140 is inserted into a through hole formed in the lower casing 130, and the tip of the convex portion protruding from the lower casing is plasticized by infrared caulking, thermal caulking, etc. It may be deformed and combined. The openings formed between the upper casing 110 and the lower casing 130 and between the adjacent columns 140 form the spout 111a. With the above, the centrifugal fan 100 is completed.

[4] Operation of the Embodiment In the centrifugal fan 100 having the above configuration, when obtaining a stator assembly in which the circuit board 135 is provided on the lower side of the lower insulator 320, the terminal 163a of the coil 163 has an outer peripheral rib 325. Since the circuit board 135 is drawn out onto the land portion 135c formed on the circuit board 135 and solder-bonded by being guided by the groove 327 formed in the circuit board 135, it is not necessary to invert the circuit board 135 together with the stator core 161 for solder bonding. .. Therefore, not only the step of the reversing work is reduced, but also the solder bonding can be performed on the surface of the circuit board 135 instead of in the through hole that reduces the rigidity of the lower casing 130. Therefore, the work efficiency can be improved by reducing the step of the reversing work without lowering the rigidity of the lower casing 130.

In particular, in the first embodiment, since the lower end surface 325c of the outer peripheral rib 325 is in contact with the circuit board 135, the groove 327 has a tunnel shape, and the terminal 163a of the coil 163 is held therein, so that the coil 163 There is an advantage that the terminal 163a of the coil 163 is hard to move even if an external force is applied to the coil 163, and the solder joint in the land portion 135c is hard to be damaged.

Further, since the resin pin 326 for fixing the lower insulator 320 to the lower casing 130 is provided on the lower end surface of the outer peripheral rib 325, the lower insulator 320 is supported by the outer peripheral rib 325 on the circuit board 135 and at that position. Since it is fixed to the lower casing 130, the lower insulator 320 is stably supported.

Further, the groove 327 has a substantially arcuate shape extending from the inner peripheral surface 325a of the outer peripheral rib 325 toward the side surface 325b, and the land portion 135c formed on the circuit board 135 is a slot of the stator core 161. Since it is arranged at the position of 161c, the upper part of the land portion 135c is open, so that the solder joining work can be easily performed.

2. 2. Second Embodiment A second embodiment of the present invention will be described with reference to FIGS. 11 to 14. The second embodiment has the same configuration as that of the first embodiment except that the shape of the groove is different from that of the first embodiment. The same reference numerals are given and the description thereof will be omitted.

As shown in FIGS. 11 and 12, a land portion 135c is provided on the upper surface of the circuit board 135 located on the radial outer side of the outer peripheral rib 325. The land portion 135c exposes the metal connected to the wiring pattern of the circuit board 135, and the terminal 163a of the coil 163 is solder-bonded to the land portion 135c. The terminal 163a of the coil 163 is guided to the land portion 135c by the groove 327 formed in the outer peripheral rib 325.

As shown in FIG. 14, a groove (guide portion) 328 extending linearly from the inner peripheral surface 325a of the outer peripheral rib 325 toward the outer peripheral surface 325d is formed on one shoulder portion of the outer peripheral rib 325. .. Since the lower end surface 325c of the outer peripheral rib 325 is in contact with the circuit board 135, the groove 328 has a tunnel shape, and the terminal 163a of the coil 163 is held therein.

Also in the second embodiment of the above configuration, the same operations and effects as those of the first embodiment can be obtained. In particular, in the second embodiment, since the terminal 163a of the coil 163 is linear from the groove 328 to the land portion 135c, the stress applied to the coil 163 is small, and the solder joint at the land portion 135c is damaged. It has the advantage of being difficult.

3. Modification example The present invention is not limited to the above embodiment, and various modifications can be made. For example, the grooves 327 and 328 are not limited to those provided on the outer peripheral rib 325, and the grooves can be provided on the protrusion 323 of the lower insulator 320. Alternatively, a pin can be erected on the protrusion 323 instead of the groove, and the terminal 163a of the coil 163 can be hooked on the pin to guide the pin to the land portion 135c. In that case, a groove into which the coil 163 fits can be formed on the outer peripheral surface of the pin.

INDUSTRIAL APPLICABILITY The present invention can be used in the technical field of a centrifugal fan as a blower widely used for cooling, ventilation, air conditioning of home appliances, OA equipment, industrial equipment, air conditioning for vehicles, blowing air, and the like.

100 ... Centrifugal fan, 110 ... Upper casing (first casing), 111 ... Suction port, 111a ... Spout, 112 ... Flange, 112a ... Through hole, 113 ... Radial rib, 114 ... Concentric rib, 115 ... Radial rib, 116 ... concentric ribs, 120 ... impeller, 121 ... hub, 122 ... blades, 123 ... main plate, 124 ... shroud, 125 ... shaft, 128 ... magnet, 129 ... rotor, 130 ... lower casing (second casing), 130a ... Through hole, 132 ... protrusion, 132a ... triangular rib, 134 ... recess, 134a ... step, 135 ... circuit board, 135a ... through hole, 135b ... opening, 135c ... land, 136 ... radial rib, 136a ... Triangular ribs, 137 ... concentric ribs, 138 ... convex parts, 138a ... through holes, 139 ... triangular ribs, 140 ... columns, 140a ... fasteners, 150 ... casing, 160 ... stator, 161 ... stator cores, 161a ... cores Back, 161b ... salient pole, 161c ... slot, 163 ... coil, 163a ... terminal, 170 ... bearing holder, 170a ... stage, 181 ... ball bearing, 182 ... ball bearing, 190 ... connector casing, 191 ... opening, 192 ... Connector pin, 196 ... Rib, 300 ... Insulator, 310 ... Upper insulator (first insulator), 320 ... Lower insulator (second insulator), 321 ... Cylindrical part, 322 ... Slit, 323 ... Protrusion part, 324 ... Arc 325 ... Outer peripheral ribs, 325a ... Inner peripheral surface, 325b ... Side surface, 325c ... Lower end surface, 326 ... Resin pin, 327 ... Groove (guide portion), 325d ... Outer surface surface, 328 ... Groove (guide portion).

Claims (5)

The stator core and circuit board are housed between the first casing and the second casing.
A first insulator is provided on one end side in the axial direction of the stator core, a second insulator is provided on the other end side in the axial direction of the stator core, and a coil is wound around the salient pole of the stator core via the first and second insulators. The circuit board is arranged on the other end side in the axial direction of the second insulator, and the circuit board is arranged.
A centrifugal fan in which the stator core and the circuit board are housed in a recess of the second casing.
The terminal of the coil is a centrifugal fan guided by a guide portion provided in the second insulator and drawn out onto a land portion formed on the circuit board and solder-bonded. The centrifugal fan according to claim 1, wherein the second insulator is provided with an outer peripheral rib that abuts on the circuit board, and the axial end surface of the outer peripheral rib is provided with a groove as the guide portion. The centrifugal fan according to claim 2, wherein the outer peripheral rib is provided with a resin pin for fixing the second insulator to the lower casing. The groove has a substantially arcuate shape extending from the inner peripheral side of the outer peripheral rib toward the side surface, and the land portion formed on the circuit board is a salient pole adjacent to the stator core. The centrifugal fan according to claim 2, which is arranged at a position corresponding to the middle of the above. The groove has a substantially linear shape extending from the inner peripheral side to the outer peripheral side of the outer peripheral rib, and the land portion formed on the circuit board is located at a position on the radial outer side of the outer peripheral rib. The centrifugal fan according to claim 2, which is arranged in.

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