JP2020153275A - Centrifugal fan - Google Patents

Abstract

To provide a centrifugal fan in which the transmission of vibration of a motor mounted on a lower casing to an upper casing can be efficiently suppressed without increasing the outer diameter of a support rod including a covered material therefor.SOLUTION: The centrifugal fan comprises: an upper casing 110; a lower casing 130 constituting a casing in cooperation with the upper casing 110; an impeller rotatably provided in the casing; a motor rotating the impeller; and a plurality of support rods 140 joining the upper casing 110 to the lower casing 130, each of the support rods 140 includes a tapered portion 141 extending from the side of the upper casing 110 to the side of the lower casing 130 while being tapered, the lower casing 130 comprises a support rod receiving portion 138 covering an area around the tapered portion 141. An elastic member 190 is interposed between the tapered portion 141 and the support rod receiving portion 138.SELECTED DRAWING: Figure 4

Description

The present invention relates to a centrifugal fan, and more particularly to a technique for suppressing transmission of vibration of a motor mounted on the lower casing to the upper casing.

Centrifugal fans are known as blowers widely used for cooling, ventilation, and air conditioning of home appliances, OA equipment, and industrial equipment, air conditioning for vehicles, and ventilation. As a conventional centrifugal fan, the case consists of an upper casing and a lower casing, the impeller is stored between the upper casing and the lower casing, and the air sucked from the suction port as the impeller rotates is taken between the upper casing and the lower casing. A centrifugal fan that blows air from an opening formed on the side surface of the casing toward the outside of the case is known (see, for example, Patent Document 1).

In the centrifugal fan of Patent Document 1, the resin upper casing 101 and the resin lower casing 102 are connected by interposing a support column 107 between the upper casing 101 and the lower casing 102. The support column 107 is integrally molded with the upper casing 101 by injection molding of resin (PBT resin, including GF reinforcement of PBT), and the protrusion 107a formed at the tip of the support column 107 is formed on the flange 118 of the lower casing 102. The protrusion 107a protruding from the through hole 119 is welded (for example, ultrasonic welding, vibration welding, laser welding, etc.), heat caulked, or the like through the through hole 119 formed in the above to lower the support column 107. It is joined to the casing 102. A motor 110 integrated with the circuit board 112 is mounted on the lower casing 102.

Normally, in this type of centrifugal fan, the amount of air blown by the centrifugal fan is adjusted by changing the rotation speed of the motor. Therefore, the vibration of the motor also changes according to the rotation speed for driving the motor. The vibration of the motor is an electromagnetic vibration generated between the stator coil of the motor and the magnet, and this electromagnetic vibration is transmitted to the lower casing to become the vibration of the centrifugal fan.

In order to attenuate the vibration of such a motor, a blower in which a vibration-proof rubber is interposed between the motor and the motor support plate has been proposed (see, for example, Patent Document 2).

In the blower of Patent Document 2, since the flange 42g for connecting the drive motor 42 and the motor support plate 44 is connected to the motor support plate 44 via the annular anti-vibration rubber 45, the drive motor 42 The vibration is dampened by the vibration isolator 45, so that the vibration transmission to the motor support plate 44 is suppressed.

As a means for suppressing the vibration of the motor in the centrifugal fan as described in Patent Document 1 from being transmitted to the upper casing, anti-vibration rubber as described in Patent Document 2 is interposed at the joint portion of the upper and lower casings. It is conceivable to do. Specifically, the outer periphery of the support column 107 formed integrally with the upper casing 101 is covered with an annular anti-vibration rubber, and the upper casing is sandwiched between the upper casing 101 and the lower casing 102. It is conceivable to connect the 101 and the lower casing 102.

Japanese Unexamined Patent Publication No. 2018-155188 JP-A-2007-1982203

However, if the entire outer circumference of the column is covered with the anti-vibration rubber as described above, the outer diameter around the column increases, and the outer diameter around the column becomes a factor that reduces the area of the outlet. Therefore, it is conceivable to insert anti-vibration rubber between the lower end surface of the column and the lower casing. However, in such a configuration, the vibration-proof rubber can be interposed only in a small part of the lower end surface of the column, so that the vibration damping is insufficient.

The present invention has been made in view of the above circumstances, and is a centrifugal fan capable of efficiently suppressing the vibration of a motor mounted on the lower casing from being transmitted to the upper casing without increasing the outer diameter around the column. The purpose is to provide.

The present invention includes a first casing, a second casing that cooperates with the first casing to form a casing, an impeller rotatably provided in the casing, a motor that rotates the impeller, and the first. The support is provided with a plurality of columns for connecting the one casing and the second casing, and the column is provided with a tapered portion extending from the first casing side to the second casing side, and the second casing is , A centrifugal fan having a support column receiving portion that covers the periphery of the tapered portion, and having an elastic member interposed between the tapered portion and the support column receiving portion.

In the present invention, since the elastic member is interposed between the tapered portion and the support column receiving portion, both the vertical vibration and the horizontal vibration can be damped by the elastic member. Moreover, since the elastic member is provided along the tapered portion, the elastic member can be arranged in a large area of the tapered portion without increasing the outer diameter around the column. Therefore, it is possible to efficiently suppress the vibration of the motor mounted on the lower casing from being transmitted to the upper casing.

Here, the support column is an integral body of the same resin fused with the first casing, has a pin-shaped protrusion on the tip surface of the tapered portion, and the protrusion is penetrated through a through hole provided in the second casing, and is formed through the through hole. The protruding portion can be crushed by heat and fixed. In such an embodiment, the number of parts can be reduced and the assembly work man-hours can be reduced, so that the manufacturing cost can be reduced.

Further, the support column receiving portion is provided with a tapered concave portion having an inner peripheral surface similar to the outer peripheral surface of the tapered portion, and a tapered tubular elastic member having a uniform thickness is arranged between the tapered portion and the tapered concave portion. Suitable. In such an aspect, the centering of the support column and the support column receiving portion can be easily performed. In this case, it is preferable that the tapered portion, the tapered concave portion, and the elastic member have a truncated cone shape.

Further, a first flange portion protruding outward in the radial direction may be provided at the end portion of the elastic member on the first casing side, and the first flange portion may be sandwiched between the first casing and the end portion of the support column receiving portion. it can. Further, a second flange portion protruding inward in the radial direction may be provided at the end portion of the elastic member on the second casing side, and the second flange portion may be sandwiched between the second casing and the end portion of the column. In such an embodiment, the vibration in the vertical direction can be efficiently damped by the first and second flange portions.

According to the present invention, it is possible to efficiently suppress the vibration of the motor mounted on the lower casing from being transmitted to the upper casing without increasing the outer diameter around the column.

It is a figure which showed the sectional view of the centrifugal fan of an embodiment, and is the sectional view of the line AA in FIG. It is the figure which showed the sectional view of the centrifugal fan of an embodiment, and is the sectional view of the line AB in FIG. It is a partially enlarged sectional view of FIG. (A) is an enlarged cross-sectional view of a portion of a column in FIG. 2, and (B) is a cross-sectional view showing a modified example of an elastic member. (A) is a plan view of the elastic member shown in FIG. 4, and (B) is a sectional view. FIG. 1 is a plan view of the upper casing shown in FIG. 1 before assembly, as viewed from the lower surface side. It is a top view of the lower casing in the state where the upper casing and the impeller shown in FIG. 1 are removed.

[1] Configuration of Centrifugal Fan FIG. 1 is a cross-sectional view of the centrifugal fan 100 according to the embodiment of the present invention. The centrifugal fan 100 includes a casing 150 in which an upper casing (first casing) 110 and a lower casing (second casing) 130 having a substantially disk shape are connected by a support column 140. A resin impeller 120 is rotatably housed between the upper casing 110 and the lower casing 130. In the description of the embodiment, the descriptions of "upper" and "lower" attached to the components indicate the directions in FIGS. 1 to 3, and do not specify the posture of the centrifugal fan 100 in the actual machine. Absent.

A suction port 111 is provided in the center of the upper casing 110. Further, on the upper surface of the upper casing 110, a three-row groove (meat stealing portion) 113 for weight reduction and reduction of material cost is formed so as to go around the entire circumference. The upper casing 110 and the lower casing 130 are molded products of resin, and as shown in FIG. 2, the upper casing 110 and the support column 140 are integrally molded and formed as an integral body.

The upper casing 110 and the lower casing 130 are connected by a support column 140 interposed between the upper casing 110 and the lower casing 130. The configuration of the support columns 140 will be described in detail later. 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 is the outlet 112.

The impeller 120 is made of resin and is composed of an annular shroud 121, a main plate 122, and a plurality of blades 123 arranged between the shroud 121 and the main plate 122. The blades 123 are all rearward blades having the same shape and are evenly arranged in the circumferential direction. An annular protrusion 121a that projects upward is formed on the inner peripheral portion of the upper surface of the shroud 121. On the other hand, an annular groove 110a into which the annular protrusion 121a is fitted is formed on the inner peripheral lower surface of the upper casing 110. A labyrinth seal is formed by the annular protrusion 121a and the annular groove 110a.

As shown in FIG. 2, the impeller 120 is integrally formed with an annular rotor yoke 124 made of a soft magnetic material (for example, an iron material) and a metal shaft 125 serving as a rotation shaft. That is, the resin impeller 120 is formed by insert molding the rotor yoke 124 and the shaft 125.

The impeller 120 has a boss 126 projecting in the direction of the suction port 111, and the shaft 125 is embedded in the boss 126 by insert molding. An annular protrusion 127 projecting in the axial direction is formed on the lower surface of the boss 126. An annular magnet 128 serving as a rotor magnet is fixed to the inner peripheral surface of the rotor yoke 124 by using an adhesive.

Inside the annular magnet 128 (on the axis center side), a stator core 161 that forms a part of the stator 160 is arranged via a gap. The stator core 161 is made by laminating thin plate-shaped soft magnetic materials such as electromagnetic steel plates, has an annular shape, and is provided with a plurality of salient poles on the outer periphery. A resin insulator 162 having a half-split structure is mounted on the stator core 161, and a stator coil 163 is wound around each salient pole via the insulator 162. The lower insulator 162 is, for example, mounted on the outer periphery of the bearing holder 170 described below, or a pin protruding downward is passed through a through hole formed in the lower casing 130 and protrudes from the through hole. The tip of the pin may be attached to the lower casing 130 by crushing it by means such as thermal caulking or infrared caulking.

A bearing holder 170 made of metal (for example, brass) having a tubular shape is fixed to the lower casing 130 by insert molding, and a stator core 161 is fixed to the outer periphery of the bearing holder 170. A flange portion 170a (see FIG. 3) is formed on the outer peripheral surface of the bearing holder 170, and the stator core 161 is fixed by utilizing the stepped portion of the flange portion 170a.

The stator 160 is composed of a stator core 161, an insulator 162, and a stator coil 163. Further, the rotor 129 is composed of the rotor yoke 124 and the magnet 128. Since the rotor 129 is integrated with the impeller 120, the impeller 120 rotates together with the rotor 129. An outer rotor type brushless DC motor is configured by the stator 160 and the rotor 129. Although the shaft 125 is embedded in the boss 126, the rotor yoke 124 may be formed in a cup shape having an opening at the center, and the opening edge thereof may be fixed to the shaft 125.

The lower casing 130 has a flat bottomed tubular structure and has a recess 132. The circuit board 133 is housed in the recess 132. The circuit board 133 is attached to the lower casing 130 and includes a drive circuit that supplies a drive current to the stator coil 163. In the lower casing 130, the connector housing 131 is integrally formed by integral molding. The connector housing 131 is provided with terminal pins 134 for making an external electrical connection to the circuit board 133. Reference numeral 135 in the figure is an electronic component.

As shown in FIG. 3, a pair of ball bearings 181, 182 are mounted inside the bearing holder 170 so as to be separated from each other in the vertical direction, and the ball bearings 181, 182 allow the bearing holder 170 to rotate the shaft 125. It is held inside the. An annular protrusion 127 formed on the boss 126 is in contact with the inner ring 181a of the upper ball bearing 181.

A flange portion 170b that projects inward is formed on the inner peripheral surface of the bearing holder 170. A coil spring 183 is mounted between the flange portion 170b and the outer ring 181b of the ball bearing 181. The inner ring 181a of the ball bearing 181 is press-fitted or adhered to the shaft 125 to prevent its movement in the vertical direction. On the other hand, the outer ring 181b is movable with respect to the bearing holder 170. Then, the outer ring 181b is urged upward by the coil spring 183, so that a preload is applied to the ball bearing 181.

Further, the outer ring 182b of the ball bearing 182 is in contact with the lower surface of the flange portion 170b, and the lower surface of the inner ring 182a of the ball bearing 182 is pressed upward by the E ring 185 attached to the lower end of the shaft 125. There is. The outer ring 182b of the ball bearing 182 is press-fitted (or adhered at that position) to the bearing holder 170 until it comes into contact with the flange portion 170b, and is prevented from moving in the vertical direction. On the other hand, the inner ring 182a is movable with respect to the shaft 125. Then, the inner ring 182a is urged upward by the E ring 185, so that the ball bearing 182 is preloaded. The inner ring 182a may be press-fitted or adhered to the shaft 125 with a preload applied.

Next, the configuration around the support column 140 will be described with reference to FIGS. 4 to 7.
As shown in FIG. 6, the upper casing 110 is formed with a plurality of flange portions 116 (four in this embodiment) protruding outward in the radial direction, and the support columns 140 are formed on the flange portions 116. The support column 140 is an integral body of the same resin fused with the upper casing 110, and has a truncated cone-shaped tapered portion 141 that tapers downward. A pin-shaped protrusion 142 is formed on the tip surface of the tapered portion 141.

On the other hand, as shown in FIG. 7, the lower casing 130 is formed with a plurality of flange portions 136 aligned with the flange portions 116 of the upper casing 110, and the flange portions 136 are formed with through holes 137. As shown in FIG. 4 (A), the pin-shaped protrusion 142 penetrates the through hole 137, and the pin-shaped protrusion 142 protruding from the through hole 137 is welded (for example, ultrasonic welding, vibration welding, laser welding, etc.). Etc.) or by heat caulking or the like to form a caulked portion 144, whereby the support column 140 and the lower casing 130 are connected.

Further, the flange portion 136 is formed with a column receiving portion 138 which is cylindrical and surrounds the through hole 137. A tapered recess 139 similar to the tapered portion 141 and forming a truncated cone shape is formed on the inner peripheral surface of the support column receiving portion 138, and an elastic member 190 is interposed between the tapered recess 139 and the tapered portion 141. ing. The elastic member 190 may be simply inserted into the tapered recess 139, but may also be adhered to the tapered recess 139.

FIG. 5A is a plan view showing the elastic member 190, and FIG. 5B is a cross-sectional view thereof. As shown in FIG. 5, the elastic member 190 has a truncated cone shape having openings 191 and 192 at both ends and having a uniform thickness. A pin-shaped protrusion 142 is inserted through the lower opening 192. An annular first flange portion 193 projecting outward in the radial direction is formed at the upper end portion of the elastic member 190, and an annular second flange portion 194 projecting inward in the radial direction is formed at the lower end portion. Such an elastic member 190 is made of a flexible material such as silicone rubber or urethane foam. The thickness and material of the elastic member 190 are determined in consideration of the damping level of vibration.

As shown in FIG. 4A, the first flange portion 193 of the elastic member 190 is sandwiched between the lower surface of the upper casing 110 and the upper end surface of the support column receiving portion 138. Further, the second flange portion 194 of the elastic member 190 is sandwiched between the stepped portion 143 formed at the boundary between the tapered portion 141 of the support column 140 and the pin-shaped protrusion 142 and the upper surface of the lower casing 130.

[2] Assembling Method of Centrifugal Fan Next, an assembling method of the centrifugal fan 100 having the above configuration will be described with reference to FIGS. 2 to 4.
(1) The circuit board 133 and the stator 160 are attached to the lower casing 130 to which the bearing holder 170 is fixed. Further, the elastic member 190 is attached to the support column receiving portion 138.
(2) The lower ball bearing 182 is press-fitted from the lower side of the bearing holder 170, and the outer ring 182b of the ball bearing 182 is brought into contact with the lower end surface of the flange portion 170b for mounting. In this case, after the outer ring 182b is brought into contact with the flange portion 170b, an adhesive may be applied to the outer ring 182b to bond the outer ring 182b, if necessary.

(3) The upper ball bearing 181 is mounted on the shaft 125 coupled to the impeller 120 on which the rotor 129 is mounted. Specifically, the shaft 125 is press-fitted into the inner ring 181a of the upper ball bearing 181, and the ball bearing 181 is mounted at a predetermined position. If necessary, an adhesive may be applied to the inner ring 181a of the ball bearing 181 to bond them.

(4) Next, the coil 183 spring and the washer (not shown) are inserted from the upper side of the bearing holder 170.

(5) After inserting the coil spring 183 and the washer into the bearing holder 170, the upper ball bearing 181 mounted on the shaft 125 is inserted into the bearing holder 170 from the upper side of the bearing holder 170, and the shaft 125 is inserted into the lower side. It is inserted into the inner ring 182a of the ball bearing 182, and the E ring 185 is attached to the lower end of the shaft 125.

(6) As a result, the upper ball bearing 181 is mounted on the bearing holder 170. At this time, the outer ring 181b of the upper ball bearing 181 is mounted on the bearing holder 170 in a loose state. Further, the E-ring 185 mounted on the lower end of the shaft presses the inner ring 182a of the lower ball bearing 182 via the washer 184, so that pressure is applied to the inner ring 182a of the lower ball bearing 182. Further, the elastic force of the coil spring 183 is applied to the outer ring 181b of the upper ball bearing 181. Instead of using the E-ring 185, the shaft 125 may be press-fitted into the inner ring 182a or an adhesive may be applied to bond the shaft 125 in a state where an upward pressure is applied to the inner ring 182a.

(7) According to the above assembly procedure, the elastic force of the coil spring 183 is applied to the outer ring 181b of the upper ball bearing 181 via the washer, and the annular protrusion 127 formed on the lower surface of the boss 126 is the inner ring of the ball bearing 181. By pressing 181a, a preload is applied to the ball bearing 181. Further, by pressing the inner ring 182a of the lower ball bearing 182 with the E ring 185, pressure is applied to the inner ring 182a of the ball bearing 182, and the outer ring 182b of the ball bearing 182 comes into contact with the flange portion 170b, so that the ball bearing 182 Is preloaded.

(8) Next, the support column 140 is inserted into the support column receiving portion 138 on which the elastic member 190 is mounted. At that time, the pin-shaped protrusion 142 of the support column 140 is passed through the through hole 137 of the lower casing 130, and the pin-shaped protrusion 142 protruding from the through hole 137 is heated and crushed to form the crimped portion 144. As a result, the upper casing 110 is coupled to the lower casing 130.

[3] Operation of Centrifugal Fan When the impeller 120 is rotated by a DC brushless motor equipped with a stator 160 and a rotor 129, air is sucked into the casing 150 from the suction port 111 and sucked in along with the rotation. The air passes between the blades 123 of the impeller 120, blows out radially outward from the impeller 120, and is ejected from the outlet 112 toward the outside of the casing 150.

At that time, the vibration generated by the DC brushless motor is transmitted to the lower casing 130, but since the elastic member 190 is interposed between the tapered portion 141 of the support column 140 and the support column receiving portion 138, the vibration in the vertical direction is also transmitted in the horizontal direction. The vibration of is also damped by the elastic member 190. Moreover, since the elastic member 190 is provided along the tapered portion 141, the elastic member 190 can be arranged in a large area of the tapered portion 141 without increasing the outer diameter around the column 140. Therefore, it is possible to efficiently suppress the vibration of the DC brushless motor mounted on the lower casing 130 from being transmitted to the upper casing 110.

In particular, in the above embodiment, the support column 140 is made into an integral body of the same resin fused with the upper casing 110, and the pin-shaped protrusion 142 formed on the tip surface of the tapered portion 141 is passed through the through hole 137 formed in the lower casing 130. Since the portion protruding from the through hole 137 is crushed and fixed by heat, the number of parts can be reduced and the assembly work man-hours can be reduced, so that the manufacturing cost can be reduced.

Further, in the above embodiment, the support column receiving portion 138 is provided with a tapered recess 139 which is an inner peripheral surface similar to the outer peripheral surface of the tapered portion 141, and the thickness is uniform between the tapered portion 141 and the tapered recess 139. Since the truncated cone-shaped elastic member 190 is arranged, the centering of the support column 140 and the support column receiving portion 138 can be easily performed. As a result, the positioning accuracy of the labyrinth seal composed of the annular protrusion 121a and the annular groove 110a is not impaired.

Further, in the above embodiment, the first flange portion 193 projecting outward in the radial direction is provided at the end portion of the elastic member 190 on the upper casing 110 side, and the first flange portion 193 is the end of the upper casing 110 and the support column receiving portion 138. A second flange portion 194 that is sandwiched between the portions and projects inward in the radial direction is provided at the end portion of the elastic member 190 on the lower casing 130 side, and the second flange portion 194 is provided on the lower casing 130 and the support column 140. Since it is sandwiched between the step portion 143 and the step portion 143, the vibration in the vertical direction can be efficiently dampened by the first and second flange portions 193 and 194.

[4] Modification Example In the above embodiment, the pin-shaped protrusion 142 is formed on the lower end surface of the support column 140, and the tip of the pin-shaped protrusion 142 protruding from the through hole 137 of the lower casing 130 is, for example, infrared rays or heat. The lower casing 130 and the upper casing 110 are joined by plastically deforming (crushing), but instead, a hole is formed in the center of the lower end surface of the support column 140, and the through hole 137 of the lower casing 140 is elastic. The lower casing 130 and the upper casing 110 may be connected by inserting tapping screws into the openings 192 of the member 190 and the holes of the columns 140.

In the above embodiment, the column 140 is integrally molded with the upper casing 110, but a counterbore is formed on the lower surface of the upper casing 110, and a strut of another part is fitted into the counterbore and bonded. It may be fixed. Similarly, in the above embodiment, the strut receiving portion 138 is integrally molded with the lower casing 130, but a counterbore is formed on the upper surface of the lower casing 130, and a strut receiver of another part is formed in the counterbore. The part may be fitted and fixed by adhesion or the like.

In the above case, since a mold for manufacturing only the support column receiving portion is used, a vortex generator having a plurality of small recesses formed on the surface thereof can be easily formed on the outer peripheral surface of the support column receiving portion as a means for generating turbulence. Can be done. That is, when the air flow blown out from the outer periphery of the impeller 120 collides with the support column receiving portion, the air flow may be disturbed by the separation from the surface of the support column receiving portion to generate a large vortex. In such a case, by forming a vortex generator as a turbulent flow generating means and generating a small vortex by the vortex generator, it is possible to suppress the generation of a large vortex and suppress the increase in noise.

In the above embodiment, the tapered portion 141 of the column 140, the tapered recess 139 of the column receiving portion 138, and the elastic member 190 are all configured in a truncated cone shape, but the present invention is not limited to such a configuration. Instead, the tapered portion 141 of the column 140 is configured in a tapered shape that tapers downward (toward the lower casing 130 side) such as a truncated cone, and the tapered recess 139 of the column receiving portion 138 and the elastic member 190 are combined with the tapered portion 141. It may be configured in a similar polygonal truncated cone shape.

In the above embodiment, the inner peripheral surface of the support column receiving portion 138 is a truncated cone-shaped tapered recess 139, but it is formed in a cylindrical shape, the outer peripheral surface of the elastic member 190 is formed into a cylindrical curved surface, and the inner peripheral surface thereof is tapered. It can be formed in a truncated cone shape that is in close contact with the portion 141.

Further, an elastic member without the first and second flange portions 193 and 194 is also within the scope of the present invention. In this case, as shown in FIG. 4B, the elastic member 190'extends from the upper end of the tapered portion 141 to the lower end of the tapered recess 139, and is formed between the upper casing 110 and the end of the support column receiving portion 138. A gap of 195,196 is formed between the space and the step portion 143 provided on the lower casing 130 and the support column 140.

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, and ventilation.

100 ... Centrifugal fan, 110 ... Upper casing (first casing), 110a ... Circular groove, 111 ... Suction port, 112 ... Air outlet, 113 ... Groove (meat stealing part), 116 ... Flange part, 120 ... Impeller, 121 ... Shroud, 121a ... annular protrusion, 122 ... main plate, 123 ... blade, 124 ... rotor yoke, 125 ... shaft, 126 ... boss, 127 ... annular protrusion, 128 ... magnet, 129 ... rotor, 130 ... lower casing (second) Casing), 131 ... Connector housing, 132 ... Concave, 133 ... Circuit board, 134 ... Terminal pin, 137 ... Through hole, 138 ... Support receiving part, 139 ... Tapered concave part, 140 ... Support, 141 ... Tapered part, 142 ... Pin Shaped protrusions, 143 ... steps, 144 ... caulking, 150 ... casing, 160 ... stator, 161 ... stator core, 162 ... insulator, 163 ... stator coil, 170 ... bearing holder, 170a ... flange, 170b ... flange, 181 ... ball bearing, 181a ... inner ring, 181b ... outer ring, 182 ... ball bearing, 182a ... inner ring, 182b ... outer ring, 190 ... elastic member, 190'... elastic member, 191 ... opening, 192 ... opening, 193 ... th 1 flange portion, 194 ... second flange portion, 195 ... gap, 196 ... gap.

Claims (6)

With the first casing
A second casing that cooperates with the first casing to form a casing,
An impeller rotatably provided in the casing and
The motor that rotates the impeller and
A plurality of columns connecting the first casing and the second casing,
With
The support column includes a tapered portion that tapers from the first casing side to the second casing side, and the second casing includes a support column receiving portion that covers the periphery of the tapered portion, and the tapered portion and the support portion. Centrifugal fan with an elastic member interposed between the support and the support. The support column is an integral body of the same resin fused with the first casing, has a pin-shaped protrusion on the tip surface of the tapered portion, and has the protrusion penetrated through a through hole provided in the second casing. The centrifugal fan according to claim 1, wherein a portion of the protrusion protruding from the through hole is crushed by heat and fixed. The strut receiving portion includes a tapered recess having an inner peripheral surface similar to the outer peripheral surface of the tapered portion, and the elastic taper tubular shape having a uniform thickness between the tapered portion and the tapered recess. The centrifugal fan according to claim 1 or 2, wherein the members are arranged. The centrifugal fan according to claim 3, wherein the tapered portion, the tapered concave portion, and the elastic member have a truncated cone shape. A first flange portion that protrudes outward in the radial direction is provided at the end portion of the elastic member on the first casing side, and the first flange portion is sandwiched between the first casing and the end portion of the support column receiving portion. The centrifugal fan according to claim 3 or 4. A claim in which a second flange portion protruding inward in the radial direction is provided at an end portion of the elastic member on the second casing side, and the second flange portion is sandwiched between the second casing and the end portion of the support column. Item 2. The centrifugal fan according to any one of Items 3 to 5.

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