JP2000027799A - Fan device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the vibration buffering effect, to facilitate the assembling, and to simplify the structure of a fan fitting part. SOLUTION: In case of fitting a fan device 20 to a fan fitting part 51, a rubber bush 41 is fitted in a fitting hole 29 of a bush fitting part 25 at three positions in the peripheral part of a fan casing 21 through a notch 28, and a second cylindrical part 44 inside of each bush 41 is fitted on each fitting boss 53 of the fan fitting part 51 side. Thereafter, a fitting screw 54 is screwed into a screw hole 53a of each fitting boss 53 so as to fit the fan device 20 for fixation to the fan fitting part 51.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan device having an improved mounting structure for a fan mounting portion to be mounted.

[0002]

A mounting structure of a fan device used in a refrigerator, for example, will be described with reference to FIGS. The fan casing 2 of the fan device 1 integrally includes a cylindrical portion 3 forming a circular ventilation opening 3a, and mounting flange portions 4, 4 provided at both axial ends of the cylindrical portion 3. The configuration is as follows.
The two mounting flanges 4 have a rectangular outer shape, and screw insertion holes 4a are formed at four corners, respectively. The fan casing 2 is provided inside the ventilation opening 3a.
A motor 6 is provided via a plurality of support portions 5 (see FIG. 8) radially provided on the motor 6, and a blade of the motor 6 is provided so as to rotate integrally with the rotor.

With respect to the fan device 1 having such a configuration,
A circular ventilation hole 9 is formed in the fan mounting portion 8 to be mounted, and the circular ventilation hole 9 is located outside the ventilation hole 9.
The screw holes 10 are formed.

In the fan device 1, the mounting screws 11 inserted into the screw insertion holes 4a of the mounting flange portions 4 and 4 are screwed into the corresponding screw holes 10 of the fan mounting portion 8 so as to mount the fan. It is attached and fixed to the part 8. In this mounting state, the ventilation opening 3a of the fan casing 2 communicates with the ventilation port 9, and the wind is caused to flow in the direction of arrow A as the blades 7 are rotated in this state.

However, the conventional configuration described above has a drawback that vibration generated during operation of the motor 6 is easily transmitted to the fan mounting portion 8.

Conventionally, there is also one shown in FIGS. 9 and 10. In this embodiment, a triangular rubber bush 12 is placed over the four corners of both mounting flanges 4 and 4 in the fan casing 2. A convex portion 13 is formed on each outer surface of each bush 12. On the fan mounting portion 8 side, an L-shaped position regulating portion 14 and an elastic engaging claw 15 are formed at four positions outside the ventilation opening 9 respectively.

In this case, however, the fan device 1
Pushes the entire fan device 1 into the fan mounting portion 8 while elastically deforming the respective elastic engaging claws 15 in a state where the bushes 12 are put on the four corners of the fan casing 2. As a result, as shown in FIG. 10, the fan casing 2 is held by the respective elastic engagement claws 15 in a state where the fan casing 2 is positioned by the respective position restricting portions 14.

In such a configuration, since the rubber bushes 12 are put on the four corners of the fan casing 2, the vibration generated by the operation of the motor 6 is transmitted to the fan mounting portion 8. Can be suppressed as much as possible by each of the bushes 12. Moreover, each bush 12
By providing the projections 13 on the, a better vibration damping effect can be obtained.

However, when the fan device 1 is mounted on the fan mounting portion 8, the bush 12 tends to come off.
It is difficult to install, and at four places on the fan mounting part 8 side,
Since it is necessary to provide the position restricting portions 14 and the elastic engaging claws 15 respectively, there is a disadvantage that the structure of the fan mounting portion 8 side becomes complicated.

The present invention has been made in view of the above circumstances, and has as its object the purpose of the present invention is to provide a vibration-absorbing effect,
It is an object of the present invention to provide a fan device that can be easily assembled and has a simple structure on the side of a fan mounting portion.

[0011]

In order to achieve the above-mentioned object, a fan device according to the present invention comprises a fan casing having a ventilation opening, and a fan casing supported by the fan casing via a support. A motor disposed inside the ventilation opening, a blade provided to rotate with the rotor of the motor, and a blade for flowing wind in the axial direction with the rotation, and a plurality of blades provided at an outer peripheral portion of the fan casing. A bush mounting portion having a mounting hole in which a notch is formed in the outer peripheral portion, and a plurality of rubber bushes mounted on each bush mounting portion by fitting into the mounting hole through the notch. And a plurality of mounting screws for mounting and fixing the fan casing to a fan mounting portion to be mounted via the bush.

In the above configuration, since rubber bushings are mounted on the bush mounting portions of the fan casing, vibrations generated during operation of the motor are absorbed by the bushes, and the vibrations are absorbed by the fan. Transmission to the mounting portion side can be suppressed as much as possible.

Further, since each bush is mounted by fitting it into a mounting hole of the bush mounting portion, the bush does not come off easily when the fan casing is mounted on the fan mounting portion. Moreover,
Since the cutout is formed in the bush mounting portion, the bush can be easily mounted in the mounting hole through the cutout.

Further, since the fan casing is configured to be mounted and fixed to the fan mounting portion by a mounting screw via a bush, the fan mounting portion only needs to have a configuration in which the mounting screw can be screwed in. The structure on the part side can be prevented from becoming complicated.

In this case, the bush has a first cylindrical portion whose outer peripheral portion fits into the mounting hole of the bush mounting portion, and a second cylindrical portion whose inner peripheral portion fits the outer peripheral portion of a mounting boss provided on the fan mounting portion. 2
And a configuration in which a radial gap is formed between the inner peripheral portion of the first tubular portion and the outer peripheral portion of the second tubular portion. Preferred (the invention of claim 3).

In such a configuration, since a gap is formed in the radial direction between the first cylindrical portion and the second cylindrical portion, the bush is formed as a single cylindrical member. The vibration damping action in the direction parallel to the mounting surface of the fan mounting portion is superior to that described above.

Further, it is preferable that the bushing has an axially protruding portion at an axial end thereof, which protrudes in the axial direction and abuts against the inner surface of the head of the mounting screw. In the case of such a configuration, the convex portion provides an excellent vibration damping action in the axial direction.

Furthermore, it is preferable that the notch in the bush mounting portion is located outside the center of the mounting screw when viewed from the center of rotation of the blade (the invention of claim 5). With such a configuration, even if an excessive force is applied to the fan casing and the bush is deformed, the bush can be prevented from coming off the notch.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. First, in FIG. 1 to FIG.
Is a cylindrical portion 23 having a circular ventilation opening 22, a ring-shaped flange portion 24 provided so as to protrude outward from the cylindrical portion 23, and an outer peripheral portion of the flange portion 24. A bush mounting portion 25 provided so as to protrude therefrom;
And a plurality of support portions 26 and 27 (see FIGS. 3 and 4) provided so as to extend radially from the center portion.

Each of the bush mounting portions 25 has a substantially circular mounting hole 29 having a cutout 28 formed in the outer peripheral portion. Each notch 28 is provided with a bush mounting portion 25.
Is formed on the outside of the side opposite to the center of the ventilation opening 22. 3 is formed thicker than the other support portions 26, and the terminal block 30 is provided here.

A motor 31 is provided inside the ventilation opening 22 via the support portions 26 and 27. As shown in FIG. 4, the motor 31 faces a stator 34 having a stator core 32 and a stator coil 33, and a rotor yoke 35 and an outer peripheral surface of the stator core 32 arranged to cover the stator 34 from outside. And a rotor 39 having a shaft 38 rotatably supported by the stator 34 via bearings 37a and 37b, and has an outer rotor shape. On the outer periphery of the rotor yoke 35 of the rotor 39, blades 40 made of an axial fan are provided. The blades 40 are rotated integrally with the rotor 39, and flow with the rotation in the direction of the arrow A which is the axial direction.

A rubber bush 41 is detachably mounted on each bush mounting portion 25 of the fan casing 21. This bush 41
As shown in FIGS. 5 and 6, the outer peripheral portion has a fitting groove 42a.
And a second cylindrical portion 44 disposed inside the first cylindrical portion 42 and connected to the first cylindrical portion 42 via a connecting portion 43. A gap 45 is formed in the radial direction between the inner peripheral portion of the first cylindrical portion 42 and the outer peripheral portion of the second cylindrical portion 44. At both ends in the axial direction of the second cylindrical portion 44, a plurality of convex portions 46a and 46b projecting in the axial direction are provided, and on the inner peripheral portion of the second cylindrical portion 44, Are provided.

The bush 41 is attached to each bush mounting portion 28 by fitting the fitting groove 42a of the first cylindrical portion 42 into the mounting hole 29 through the cutout portion 28 of each bush mounting portion 25. It is supposed to be.

On the other hand, a circular vent 52 is formed in the fan mounting portion 51 of, for example, the duct 50 to which the fan device 20 is mounted, and three circular vents 52 are located outside the vent 52. A boss 53 is formed. A screw hole 53a is formed in each mounting boss 53, and a mounting screw 54 can be screwed into the screw hole 53a. The outer diameter of the mounting boss 53 is set slightly smaller than the inner diameter of the second cylindrical portion 44 of the bush 41 so that the second cylindrical portion 44 can fit outside the mounting boss 53. Has become.

The case where the fan device 20 is mounted on the fan mounting portion 51 in the above configuration will be described. In order to attach the fan device 20 to the fan attachment portion 51, first, each bush attachment portion 2
The bush 41 is attached to 5. At this time, bush 4
1 through the notch 28 of the bush mounting portion 25,
The fitting is performed by fitting the fitting groove 42a of the cylindrical portion 42 into the mounting hole 29.

Next, the second tubular portion 44 of each bush 41 is connected to each mounting boss 53 of the fan mounting portion 51 while the ventilation opening 22 of the fan casing 21 corresponds to the ventilation hole 52 of the fan mounting portion 51. To fit. Thereafter, the screw portion 54a of the mounting screw 54 is screwed into the screw hole 53a of each mounting boss 53. At this time, the convex portion 46 of the bush 41
Of the a and b, the rear convex portion 46a comes into contact with the front surface 51a of the fan mounting portion 51, and the front convex portion 6b comes into contact with the inner surface of the head portion 53b of the mounting boss 53.
In this manner, the fan casing 21 and thus the fan device 20 can be mounted on the fan mounting portion 51 by the three mounting screws 54 via the bush 41.

In the above embodiment, the following effects can be obtained. First, since the bush 41 made of rubber is attached to each bush attachment portion 25 of the fan casing 21, the vibration generated by the operation of the motor 31 is absorbed by each bush 41, and the vibration is absorbed by the fan attachment portion. Transmission to the 51 side can be suppressed as much as possible.

In this case, in particular, the bush 41 has a double tubular shape having a first tubular portion 42 and a second tubular portion 44, and has a diameter between the first and second tubular portions 42, 44. Gap 4 in the direction
5, the bush 41 effectively absorbs the vibration even in the gap 45, and the bush 41 has a fan mounting portion 51 which is smaller than a single bush. The vibration damping action in the direction parallel to the front surface 51a (mounting surface) is excellent.

In addition, at both ends in the axial direction of the bush 41, there are provided convex portions 46a, 46b projecting in the axial direction. These convex portions 46a, 46b are connected to the front surface 51a of the fan mounting portion 51 and the mounting screw Since it is configured to come into contact with the inner surface of the head 54b, the vibration damping action in the axial direction (front-back direction) is excellent.

Further, since each bush 41 is mounted by fitting it into the mounting hole 29 of the bush mounting portion 25, when the fan casing 21 is mounted on the fan mounting portion 51, the bush 41 can be easily mounted. It does not come off and can be easily assembled. Moreover, since the cutout portion 28 is formed in the bush mounting portion 25, the bush 41 can be easily mounted to the mounting hole 29 through the cutout portion 28, which also facilitates assembly. .

The notch 28 in the bush mounting portion 25 is located outside the center of the mounting screw 54 (the center of the mounting boss 53) when viewed from the center of rotation of the blade 40, so that the fan Even if an excessive force is applied to the casing 21 and the bush 41 is deformed, the bush 4
1 can be prevented from coming off the notch 28.

Further, since the fan casing 21 is configured to be mounted and fixed to the fan mounting portion 51 by the mounting screw 54 via the bush 41, the mounting screw 54 can be screwed into the fan mounting portion 51 side. Unlike the conventional configuration in which the position restricting portion and the elastic engaging claw need to be provided on the fan mounting portion side, it is possible to prevent the structure of the fan mounting portion 51 from becoming complicated. Further, in the present embodiment, since only three bushes 41 are required, the number of parts can be reduced, workability can be improved, and cost can be reduced as compared with a configuration requiring four bushes. .

Further, since the motor 31 is of the outer rotor type, the size in the axial direction can be reduced, the size can be reduced, and the arrangement space can be effectively used.

[0034]

As is clear from the above description, according to the present invention, the following effects can be obtained. Claim 1
According to the fan device described above, a good vibration damping effect can be obtained by using the rubber bush. Further, each bush is mounted by fitting it into a mounting hole of the bush mounting portion, and since a cutout portion is formed in the mounting hole, assembly can be facilitated. Furthermore, since the fan casing is configured to be mounted and fixed to the fan mounting portion with mounting screws via bushes, the fan mounting portion side only needs to have a configuration in which the mounting screws can be screwed in. The structure can be simplified.

According to the fan device of the second aspect, since the motor adopts the outer rotor type, the size in the axial direction can be reduced, the size can be reduced, and the arrangement space can be effectively reduced. Will be available. According to the fan device of the third aspect, the bush has a double tubular shape having the first tubular portion and the second tubular portion, and a radial gap is provided between the first and second tubular portions. The bushing effectively absorbs the vibrations even in the gaps between the bushing and the direction parallel to the mounting surface of the fan mounting part, compared to the case where the bushing is simply a single cylinder. Has an excellent vibration damping effect.

According to the fan device of the fourth aspect, the protrusion is provided at the end of the bush in the axial direction, so that the vibration damping action in the axial direction is excellent. According to the fan device of the fifth aspect, since the cutout portion in the bush mounting portion is located outside the center of the mounting screw when viewed from the center of rotation of the blade, an excessive force is applied to the fan casing. As a result, even if the bush is deformed, the bush can be prevented from coming off the notch.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention.

FIG. 2 is a front view of the fan device.

FIG. 3 is a rear view

FIG. 4 is a longitudinal sectional side view.

FIG. 5 is a perspective view of a bush.

FIG. 6 is a longitudinal sectional view of a main part in an attached state.

FIG. 7 is a diagram corresponding to FIG. 1 showing a conventional configuration.

FIG. 8 is a diagram corresponding to FIG. 3;

FIG. 9 is a diagram corresponding to FIG. 1, showing another conventional configuration.

FIG. 10 is a front view in an attached state.

[Explanation of symbols]

20 is a fan device, 21 is a fan casing, 22 is a ventilation opening, 25 is a bush mounting portion, 26 and 27 are support portions, 28 is a cutout portion, 29 is a mounting hole, 31 is a motor, 34
Is a stator, 38 is a shaft, 39 is a rotor, 40 is a blade, 41 is a bush, 42 is a first cylindrical portion, 44 is a second cylindrical portion, 45 is a gap, 46a and 46b are convex portions, and 51 is a fan mounting. , 52 is a vent, 53 is a mounting boss, 53a is a screw hole, 54 is a mounting screw, and 54b is a head.

Claims (5)

[Claims] 1. A fan casing having a ventilation opening, a motor disposed inside the ventilation opening while being supported by the fan casing via a supporting portion, and rotating together with a rotor of the motor. Are provided so as to flow the wind in the axial direction along with the rotation thereof, and provided at a plurality of locations on the outer peripheral portion of the fan casing,
A bush mounting portion having a mounting hole with a notch formed in an outer peripheral portion thereof; and a plurality of rubber bushes mounted on each bush mounting portion by fitting the mounting hole through the notch. And a plurality of mounting screws for mounting and fixing the fan casing to a fan mounting portion to be mounted via a bush. 2. The fan device according to claim 1, wherein the motor is of an outer rotor type. 3. The bush has an outer peripheral portion fitted into a mounting hole of the bush mounting portion, and an inner peripheral portion fitted into an outer peripheral portion of a mounting boss provided on the fan mounting portion. And a configuration in which a radial gap is formed between the inner peripheral portion of the first tubular portion and the outer peripheral portion of the second tubular portion. The fan device according to claim 1, wherein: 4. The fan device according to claim 1, further comprising a projection at an axial end of the bush, the projection protruding in the axial direction and abutting against an inner surface of a head of the mounting screw. 5. The fan device according to claim 1, wherein the notch in the bush mounting portion is located outside the center of the mounting screw when viewed from the center of rotation of the blade.