JP7265386B2 - centrifugal fan - Google Patents

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 a lower casing to an upper casing.

A centrifugal fan is known as a blower that is widely used for cooling, ventilating, and air-conditioning home appliances, OA equipment, and industrial equipment, and air-conditioning and blowing air for vehicles. As a conventional centrifugal fan, the case consists of an upper casing and a lower casing, and an impeller is housed between the upper casing and the lower casing. There is known a centrifugal fan that blows air toward the outside of the case from an opening formed in the side surface of the case (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 the struts 107 between the upper casing 101 and the lower casing 102 . The strut 107 is formed integrally with the upper casing 101 by injection molding of resin (PBT resin, including GF reinforcement of PBT). By inserting the protrusion 107a protruding from the through hole 119 into the through hole 119 formed in the second through hole 119 and welding (for example, ultrasonic welding, vibration welding, laser welding, etc.) or heat caulking, the support 107 and the lower The casing 102 is joined. A motor 110 integrated with a circuit board 112 is attached to 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 number of rotations of the motor. Vibration of the motor is electromagnetic vibration generated between the stator coil and the magnet of the motor, and this electromagnetic vibration is transmitted to the lower casing and becomes vibration of the centrifugal fan.

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

In the blower of Patent Document 2, a 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 transmission of vibration to the motor support plate 44 is suppressed by damping the vibration with the vibration isolator 45 .

As a means for suppressing the transmission of the vibration of the motor of the centrifugal fan described in Patent Document 1 to the upper casing, the anti-vibration rubber described in Patent Document 2 is interposed at the joint between the upper and lower casings. can be considered. Specifically, the outer periphery of the strut 107 integrally formed with the upper casing 101 is covered with an annular vibration-isolating rubber, and the upper casing 101 and the lower casing 102 are sandwiched between the upper casing 101 and the lower casing 102 . It is conceivable to connect 101 and lower casing 102 .

JP 2018-155188 A Japanese Patent Application Laid-Open No. 2007-198203

However, when the entire outer periphery of the support is covered with the vibration-isolating rubber as described above, the outer diameter around the support increases, and the outer diameter around the support reduces the area of the outlet. Therefore, it is conceivable to interpose an anti-vibration rubber between the lower end surface of the column and the lower casing. However, in such a configuration, vibration damping is insufficient because the anti-vibration rubber can be interposed only in a small portion of the lower end surface of the column.

The present invention has been made in view of the above circumstances, and is a centrifugal fan capable of efficiently suppressing transmission of vibrations of a motor mounted on a lower casing to an upper casing without increasing the outer diameter around the support. intended to provide

The present invention provides a first casing, a second casing that cooperates with the first casing to form a casing, an impeller that is rotatably provided in the casing, a motor that rotates the impeller, and the second casing. a plurality of struts connecting the first casing and the second casing, the struts having tapered portions extending from the first casing side to the second casing side, and the second casing a post receiving portion covering the periphery of the tapered portion; an elastic member interposed between the tapered portion and the post receiving portion; a fixing portion is provided on the tip end surface of the taper portion, and the fixing portion includes a shaft portion inserted into a through hole provided in the second casing and a crimped portion projecting from the through hole and having a larger diameter than the through hole. It is a centrifugal fan consisting of

In the present invention, since the elastic member is interposed between the tapered portion and the post receiving portion, both vertical and horizontal vibrations 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 support. Therefore, it is possible to efficiently suppress transmission of the vibration of the motor mounted on the lower casing to the upper casing.

In addition , the post is an integral body made of the same resin that is fused with the first casing, and has a pin-shaped projection on the tip surface of the tapered portion. Since the portion that has been pressed is crushed by heat and fixed , the number of parts can be reduced, and the number of assembling man-hours can be reduced, so that the manufacturing cost can be reduced.

Further, the present invention provides a first casing, a second casing that cooperates with the first casing to form a casing, an impeller that is rotatably provided in the casing, a motor that rotates the impeller, a plurality of struts connecting the first casing and the second casing, the struts having tapered portions extending from the first casing side to the second casing side; The casing includes a post receiving portion that surrounds the tapered portion, an elastic member is interposed between the tapered portion and the post receiving portion, and the post receiving portion has a shape similar to the outer peripheral surface of the tapered portion . A taper recess having an inner peripheral surface is provided, the tapered cylindrical elastic member having a uniform thickness is disposed between the taper portion and the taper recess , and the end of the elastic member on the first casing side is disposed. A centrifugal fan in which a first flange portion protruding radially outward is provided on the portion of the fan, and the first flange portion is sandwiched between the first casing and the end portion of the support column receiving portion.

According to the centrifugal fan configured as described above, it is possible to obtain the same function and effect as the above-described centrifugal fan. Since a tapered cylindrical elastic member having a uniform thickness is arranged between the tapered portion and the tapered recess, the support and the support receiving portion can be easily centered. In this case, it is preferable that the tapered portion, the tapered recess, and the elastic member have a truncated cone shape. A first flange projecting radially outward is provided at the end of the elastic member on the first casing side, and the first flange is sandwiched between the first casing and the end of the column receiving portion. Therefore, vertical vibration can be efficiently damped. Furthermore, if a second flange projecting radially inward is provided at the end of the elastic member on the side of the second casing, and the second flange is sandwiched between the second casing and the end of the strut, the first , and the second flange portion can efficiently attenuate vibration in the vertical direction.

ADVANTAGE OF THE INVENTION According to this invention, it can suppress efficiently that the vibration of the motor with which the lower casing was mounted|worn is transmitted to the upper casing, without increasing the outer diameter of the circumference|surroundings of a support|pillar.

FIG. 7 is a cross-sectional view of the centrifugal fan of the embodiment, taken along line AA in FIG. 6. FIG. FIG. 7 is a cross-sectional view of the centrifugal fan of the embodiment, taken along the line AB in FIG. 6. FIG. FIG. 3 is a partially enlarged sectional view of FIG. 2; (A) is an enlarged cross-sectional view of a support column in FIG. 2, and (B) is a cross-sectional view showing a modification of an elastic member. (A) is a plan view of the elastic member shown in FIG. 4, and (B) is a cross-sectional view. It is the top view which looked at the thing before the assembly of the upper casing shown in FIG. 1 from the lower surface side. 2 is a plan view of the lower casing with the upper casing and the impeller shown in FIG. 1 removed; FIG.

[1] Configuration of Centrifugal Fan FIG. 1 is a cross-sectional view of a centrifugal fan 100 according to one 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 each having a substantially disc shape are connected by a strut 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 "top" and "bottom" attached to the components indicate the directions in FIGS. do not have.

A suction port 111 is provided in the center of the upper casing 110 . Further, on the upper surface of the upper casing 110, three grooves (thickening portions) 113 are formed around the entire circumference for weight reduction and material cost reduction. The upper casing 110 and the lower casing 130 are resin moldings, and as shown in FIG. 2, the upper casing 110 and the struts 140 are integrally formed as a unit.

Upper casing 110 and lower casing 130 are connected by a strut 140 interposed between upper casing 110 and lower casing 130 . In addition, the structure of the part of the support|pillar 140 is explained in detail later. A portion of the side surface of the casing 150 excluding the strut 140 forms a gap between the upper casing 110 and the lower casing 130 , and this gap portion serves as 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 backward-facing blades having the same shape and are evenly arranged in the circumferential direction. An annular protrusion 121a is formed on the inner peripheral portion of the upper surface of the shroud 121 so as to protrude upward. On the other hand, an annular groove 110a into which the annular protrusion 121a is fitted is formed in the lower surface of the inner peripheral side of the upper casing 110. As shown in FIG. 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, iron material) and a metal shaft 125 serving as a rotating shaft. That is, resin impeller 120 is formed by insert-molding rotor yoke 124 and shaft 125 .

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

A stator core 161 that constitutes a part of the stator 160 is arranged inside the ring-shaped magnet 128 (on the shaft center side) with a gap therebetween. The stator core 161 is made by stacking thin plate-like soft magnetic materials such as electromagnetic steel sheets, has an annular shape, and has a plurality of salient poles on the outer periphery. The stator core 161 is fitted with a resin insulator 162 having a vertically split structure, and each salient pole is wound with a stator coil 163 via the insulator 162 . For example, the lower insulator 162 is attached to 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 to protrude from the through hole. The tip of the pin may be attached to the lower casing 130 by crushing it by means such as heat crimping or infrared crimping.

A cylindrical bearing holder 170 made of metal (for example, brass) 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 using the step portion of the flange portion 170a.

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

The lower casing 130 has a flat cylindrical structure with a bottom and has a recess 132 . A circuit board 133 is accommodated in the recess 132 . The circuit board 133 is attached to the lower casing 130 and has a drive circuit that supplies a drive current to the stator coil 163 . A connector housing 131 is integrally formed with the lower casing 130 by integral molding. Terminal pins 134 for external electrical connection to the circuit board 133 are arranged in the connector housing 131 . Reference numeral 135 in the drawing denotes an electronic component.

As shown in FIG. 3, a pair of ball bearings 181 and 182 are mounted inside the bearing holder 170 so as to be spaced apart in the vertical direction. is held inside the An annular protrusion 127 formed on the boss 126 is in contact with the inner ring 181 a of the upper ball bearing 181 .

An inner peripheral surface of the bearing holder 170 is formed with a flange portion 170b protruding inward. A coil spring 183 is mounted between the flange portion 170b and the outer ring 181b of the ball bearing 181. As shown in FIG. An inner ring 181a of the ball bearing 181 is press-fitted or adhered to the shaft 125 to prevent vertical movement. On the other hand, the outer ring 181 b is movable with respect to the bearing holder 170 . A coil spring 183 urges the outer ring 181b upward to apply a preload to the ball bearing 181 .

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 an 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 into the bearing holder 170 until it comes into contact with the flange portion 170b (or is adhered at that position), 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. As shown in FIG. A preload is applied to the ball bearing 182 by urging the inner ring 182 a upward by the E-ring 185 . Note that the inner ring 182a may be press-fitted or adhered to the shaft 125 in a preloaded state.

Next, the configuration around the column 140 will be described with reference to FIGS. 4 to 7. FIG.
As shown in FIG. 6, the upper casing 110 is formed with a plurality of (four in this embodiment) flange portions 116 protruding radially outward, and the flange portions 116 are formed with struts 140 . The strut 140 is a single body made of the same resin that is 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. 4A, the pin-shaped projection 142 passes through the through-hole 137, and the pin-shaped projection 142 protruding from the through-hole 137 is welded (for example, ultrasonic welding, vibration welding, laser welding, etc.) or by heat crimping or the like to form a crimped portion 144, by which the column 140 and the lower casing 130 are connected.

Further, the flange portion 136 is formed with a column receiving portion 138 that has a cylindrical shape and surrounds the through hole 137 . A tapered recess 139 having a truncated cone shape similar to the tapered portion 141 is formed on the inner peripheral surface of the support post 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 or may be adhered to the tapered recess 139 .

5A is a plan view showing the elastic member 190, and FIG. 5B is a sectional view thereof. As shown in FIG. 5, the elastic member 190 has a truncated cone shape with a uniform thickness having openings 191 and 192 at both ends. A pin-shaped projection 142 is inserted through the opening 192 on the lower side. An annular first flange portion 193 projecting radially outward is formed at the upper end portion of the elastic member 190, and an annular second flange portion 194 projecting radially inward is formed at the lower end portion. Such 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 vibration damping level.

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 column receiving portion 138 . 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 140 and the pin-shaped projection 142 and the upper surface of the lower casing 130 .

[2] Method for Assembling Centrifugal Fan Next, a method for assembling the centrifugal fan 100 configured as described above will be described with reference to FIGS.
(1) Attach the circuit board 133 and the stator 160 to the lower casing 130 to which the bearing holder 170 is fixed. Also, an elastic member 190 is attached to the post receiving portion 138 .
(2) The lower ball bearing 182 is press-fitted into the bearing holder 170 from below so that the outer ring 182b of the ball bearing 182 is brought into contact with the lower end surface of the flange portion 170b. In this case, after bringing the outer ring 182b into contact with the flange portion 170b, if necessary, an adhesive may be applied to the outer ring 182b for adhesion.

(3) The upper ball bearing 181 is mounted on the shaft 125 coupled with 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, the inner ring 181a of the ball bearing 181 may be adhered by applying an adhesive.

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

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

(6) Thereby, 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 attached to the bearing holder 170 in a loose state. An E-ring 185 attached to the lower end of the shaft presses the inner ring 182a of the lower ball bearing 182 via the washer 184, thereby applying pressure to the inner ring 182a of the lower ball bearing 182. Also, 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 while an upward pressure is applied to the inner ring 182a, or may be adhered by applying an adhesive.

(7) Due 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 projection 127 formed on the lower surface of the boss 126 is brought into contact with the inner ring of the ball bearing 181. A preload is applied to the ball bearing 181 by pressing the ball bearing 181a. Also, 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 contacts the flange portion 170b. is preloaded.

(8) Next, the post 140 is inserted into the post receiving portion 138 to which the elastic member 190 is attached. At this time, the pin-shaped projection 142 of the strut 140 is passed through the through-hole 137 of the lower casing 130 , and the pin-shaped projection 142 projecting from the through-hole 137 is heated and crushed to form the crimped portion 144 . Thereby, upper casing 110 is coupled to lower casing 130 .

[3] Operation of Centrifugal Fan When the impeller 120 rotates by being driven by a DC brushless motor having a stator 160 and a rotor 129, air is sucked into the casing 150 through the suction port 111 along with the rotation. The air passes between the blades 123 of the impeller 120 and blows out from the impeller 120 radially outward and out of the casing 150 from the blowout port 112 .

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 140 and the support support 138, the vibration in the vertical direction is also transmitted in the horizontal direction. 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 over a large area of the tapered portion 141 without increasing the outer diameter around the post 140 . Therefore, it is possible to efficiently suppress transmission of the vibration of the DC brushless motor attached to the lower casing 130 to the upper casing 110 .

In particular, in the above-described embodiment, the strut 140 is integrated with the upper casing 110 and made of the same resin. Since the portion protruding from the through hole 137 is crushed by heat and fixed, the number of parts can be reduced and the man-hours for assembling work can be reduced, so that the manufacturing cost can be reduced.

Further, in the above-described embodiment, the post receiving portion 138 includes the tapered recess 139 that is the 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 conical elastic member 190 is arranged, the support 140 and the support 138 can be easily centered. As a result, the positioning accuracy of the labyrinth seal formed by the annular protrusion 121a and the annular groove 110a is not hindered.

Furthermore, in the above-described embodiment, the end portion of the elastic member 190 on the upper casing 110 side is provided with the first flange portion 193 protruding radially outward. A second flange portion 194 protruding radially inward 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 strut 140. Since it is sandwiched between the stepped portion 143 and the first and second flange portions 193 and 194, the vibration in the vertical direction can be efficiently damped.

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

In the above embodiment, the strut 140 is integrally formed with the upper casing 110, but a counterbore is formed in the lower surface of the upper casing 110, and a separate strut can be fitted into the counterbore and bonded. May be fixed. Similarly, in the above-described embodiment, the support post receiving portion 138 is integrally formed with the lower casing 130, but a counterbore hole is formed in the upper surface of the lower casing 130, and the support post support portion of a separate component is formed in the counterbore hole. The parts may be fitted and fixed by adhesion or the like.

In the above case, since a mold is used to manufacture only the pillar receiving part, it is possible to easily form a vortex generator with a plurality of small recesses formed on the surface as turbulent flow generating means on the outer peripheral surface of the pillar receiving part. can be done. That is, when the airflow blown out from the outer periphery of the impeller 120 collides with the support support portion, the separation from the surface of the support support portion may disturb the airflow and generate a large vortex. In such a case, a vortex generator is formed as a turbulence generating means, and a small vortex is generated by the vortex generator, thereby suppressing the generation of a large vortex and suppressing an increase in noise.

In the above embodiment, the tapered portion 141 of the post 140, the tapered recess 139 of the post 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 post 140 is tapered downward (toward the lower casing 130 side) such as a pyramidal frustum, and the tapered recess 139 of the post receiving portion 138 and the elastic member 190 form the tapered portion 141. It may be configured in a similar polygonal truncated pyramid shape.

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

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

INDUSTRIAL APPLICABILITY The present invention can be used in the technical field of centrifugal fans as air blowers that are widely used for cooling, ventilation, and air conditioning of home appliances, OA equipment, and industrial equipment, and air conditioning and air blowing for vehicles.

DESCRIPTION OF SYMBOLS 100... Centrifugal fan, 110... Upper casing (1st casing), 110a... Annular groove, 111... Suction port, 112... Air outlet, 113... Groove (thickness part), 116... Flange part, 120... Impeller, 121... Shroud 121a Annular projection 122 Main plate 123 Blade 124 Rotor yoke 125 Shaft 126 Boss 127 Annular projection 128 Magnet 129 Rotor 130 Lower casing (second Casing) 131 Connector housing 132 Concave portion 133 Circuit board 134 Terminal pin 137 Through hole 138 Post receiving portion 139 Tapered concave portion 140 Post 141 Tapered portion 142 Pin 143 stepped portion 144 crimped portion 150 casing 160 stator 161 stator core 162 insulator 163 stator coil 170 bearing holder 170a flange portion 170b flange portion 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... Third 1 flange portion, 194...second flange portion, 195...gap, 196...gap.

Claims (4)

a first casing;
a second casing that forms a casing in cooperation with the first casing;
an impeller rotatably provided within the casing;
a motor that rotates the impeller;
a plurality of struts connecting the first casing and the second casing;
with
The strut has a tapered portion extending from the first casing side to the second casing side, and the second casing includes a strut receiving portion covering the tapered portion. An elastic member is interposed between the post receiving part,
The post is an integral body made of the same resin that is fused with the first casing, and has a fixed portion on the tip end surface of the tapered portion, and the fixed portion is a shaft portion inserted into a through hole provided in the second casing. and a crimped portion projecting from the through hole and having a larger diameter than the through hole . a first casing;
a second casing that forms a casing in cooperation with the first casing;
an impeller rotatably provided within the casing;
a motor that rotates the impeller;
a plurality of struts connecting the first casing and the second casing;
with
The strut has a tapered portion extending from the first casing side to the second casing side, and the second casing includes a strut receiving portion covering the tapered portion. An elastic member is interposed between the post receiving part,
The post receiving portion includes a tapered recess having an inner peripheral surface similar in shape to the outer peripheral surface of the tapered portion, and the tapered cylindrical elastic tube having a uniform thickness is provided between the tapered portion and the tapered recess. Place the parts and
A first flange projecting radially outward is provided at the end of the elastic member on the first casing side, and the first flange is sandwiched between the first casing and the end of the support post receiving portion. centrifugal fan. 3. The centrifugal fan according to claim 2, wherein the tapered portion, the tapered recess, and the elastic member have a truncated cone shape. A second flange projecting radially inward is provided at the end of the elastic member on the side of the second casing, and the second flange is sandwiched between the second casing and the end of the strut. 4. A centrifugal fan according to item 2 or 3.

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