JPH08331803A - Vibration isolator for fan motor - Google Patents

Abstract

PURPOSE: To provide a vibration isolator for fan motor with which a fan motor does not produce much uncomfortable vibrations and noise even when the rotating speed of the fan motor is controlled frequently. CONSTITUTION: A motor-side rubber vibration isolator 22 the one end of which is fitted to a fan casing 16 housing a fan 15 with a fan-side rubber vibration isolator 12 between the outer periphery of a vane boss 11 and the cylindrical part 3 of a main plate fixture 5 and which supports the front-side bearing section 21 by means of a second fitting leg 23 fitted to a first fitting leg 20 with a motor-side rubber vibration isolator 19 which holds the rear-side bearing section 18 of the motor 17 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolation device for a fan motor provided in a range hood, a ceiling-embedded ventilation fan or the like.

[0002]

2. Description of the Related Art In recent years, in a range hood, a ceiling-embedded ventilation fan, etc., the fan motor rotation frequency is frequently controlled from the viewpoint of ventilation at an optimum air volume according to the cooking condition and the condition of the living room. This is due to the increasing fluctuations in fan motor vibration, and the tendency for unpleasant vibration and noise to increase. Is increasing.

A conventional fan motor of this type is shown in FIG.
This will be described with reference to 2. As shown, fan 5
The fan case 5 in which the ring-shaped portion 54 on the side opposite to the suction side is attached to the motor 52 to which 1 is attached via the motor attachment plate 53.
5, the fan case 5 is provided with a vibration-proof rubber 56 that engages with the annular portion 54 of the fan case 55 and is interposed between the motor mount plate 53 and the motor mount plate 53.
5 was attached to the motor 52.

[0004]

According to the conventional vibration isolator for the fan motor, the anti-vibration rubber 56 is interposed between the motor mounting plate 53 and the annular portion 54 of the fan case 55. The resonance between the motor shaft 57 and the fan 51 and the vibration generated from the motor 52 cannot be mitigated, and there is a problem that the vibration isolation device for the fan motor cannot be satisfied. Further, when the fan motor is driven at a low speed, low frequency vibration is generated. The hardness of the anti-vibration rubber 56 needs to be made extremely low in order to reliably prevent this low-frequency vibration, but if the hardness is made low, the anti-vibration rubber cannot be made flame-retardant. There is a problem that it cannot be used as a vibration isolator or that low frequency vibration cannot be damped.

SUMMARY OF THE INVENTION The first object of the present invention is to provide a vibration isolator for a fan motor, which produces less unpleasant vibration and noise even if the rotation speed of the fan motor is frequently controlled. And

It is a second object of the present invention to provide a vibration isolation device for a fan motor that produces less unpleasant vibration and noise even when the fan motor rotates at a low speed.

A third object of the present invention is to provide an anti-vibration device for a fan motor, which prevents the main plate of the fan from moving in the axial direction and further causes less vibration and noise.

[0008]

In order to achieve the above-mentioned first object, a fan motor vibration isolator according to the present invention has a first object.
The means of the main plate mounting tool provided with a cylindrical portion fitted in the central portion of the main plate provided with a number of blades and a flange for mounting the main plate, a cylindrical blade boss into which the motor shaft is inserted, and the blade boss A fan provided with a fan-side anti-vibration rubber provided by vulcanization adhesion between the outer periphery and the tubular portion of the main plate attachment,
A fan casing for accommodating the fan therein; a first mounting leg having an end attached to the fan casing and an annular motor-side anti-vibration rubber for holding a rear bearing portion of the motor in a central portion; A second mounting leg attached to the first mounting leg and provided with a ring-shaped motor-side anti-vibration rubber for holding the front side bearing portion of the motor; It will be installed.

Further, in order to achieve the second object, the second
This means is formed by molding a motor-side anti-vibration rubber with foamed silicone.

The third means is such that the motor side vibration isolating rubber is formed of a low hardness vibration isolating rubber inside and a high hardness vibration isolating rubber including this low hardness vibration isolating rubber is formed outside.

Further, in order to achieve the third object, the fourth object
In the above means, a concave portion is provided in the flange formed on the main plate mounting member, and the fan-side anti-vibration rubber is vulcanized and bonded to the outer periphery of the blade boss, the inner surface of the cylindrical portion and the flange concave portion.

The fifth means is such that the fan-side anti-vibration rubber is formed by integrally molding the outer periphery of the blade boss, the inner surface of the cylindrical portion and the flange concave portion with foamed silicon.

[0013]

According to the present invention, by virtue of the construction of the above-mentioned first means, resonance between the motor shaft and the fan is prevented by the vibration isolator on the fan side, and vibrations generated from the motor can be transmitted to the fan casing by the antivibration rubber on the motor side. The vibration is blocked even if the rotation speed control is frequently performed.

Further, according to the structure of the second means, the low-frequency vibration generated when the fan motor is rotated at a low speed is absorbed by the deformation of the bubble portion inside the vibration damping rubber on the motor side,
Vibration can be prevented from being transmitted to the fan casing.

With the structure of the third means, the low-frequency vibration generated when the fan motor is rotated at a low speed is absorbed by the deformation of the low hardness portion inside the vibration damping rubber on the motor side, so that the vibration is generated in the fan casing. It can be prevented from being transmitted to.

Further, according to the structure of the fourth means, the fan main plate is prevented from swinging in the axial direction by the vibration isolating rubber of the flange concave portion of the fan side antivibration rubber.

Further, according to the structure of the fifth means, the low frequency vibration generated when the fan motor is rotated at a low speed is absorbed by the deformation of the bubble portion inside the vibration damping rubber on the fan side,
Resonance with the motor shaft fan is prevented, and the fan main plate is prevented from swinging and shaking in the axial direction.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. As shown in the figure, a main plate attachment 5 having a cylindrical portion 3 fitted from the side of the blade office 1 and a flange 4 for attaching the main plate 2 is provided at the central portion of the main plate 2 provided with a large number of blade offices 1, and a tip is provided. A threaded portion 7 for engaging a nut 6 is formed on a cylindrical portion, and a motor shaft 9 provided with a pin 8 in the middle thereof is inserted into a cylindrical shape, and an engaging groove 10 for engaging the pin 8 provided on the motor shaft 9 is provided at a rear portion thereof. Outer periphery of the blade boss 11 and the main plate attachment 5
The fan-side anti-vibration rubber 12 provided between the cylindrical portions 3 of the blades is joined to the outer surface of the blade boss 11 and the inner surface of the cylindrical portion 3 by vulcanization adhesion to form the blade boss assembly 14, The flange 4 is attached to the main plate 2 to form the fan 15.
Then, a first mounting leg 20 having an end attached to a fan casing 16 that houses the fan 15, and an annular motor-side anti-vibration rubber 19 that holds a rear bearing portion 18 of the motor 17 in the central portion, A second mounting leg 23, which is attached to the first mounting leg 20 and provided with an annular vibration damping rubber 22 for holding the front side bearing portion 21 of the motor 17, is attached to the fan casing 16. Motor 1
The fan boss 11 of the fan 15 is fitted into the motor shaft 9 of the fan 7, and the fan 15 is attached to the screw portion 7 of the motor shaft 9 through the attaching means for attaching the nut 6 to form a fan motor.

In the above configuration, when the fan 15 is driven by the motor 17, the motor shaft 9 and the fan 15 are in a floating state with respect to the motor shaft 9 without a metal connection, so Resonance with the fan 15 is prevented by the fan-side vibration isolation rubber 12, and the motor-side vibration isolation rubbers 19 and 22 prevent the motor 17 from floating with respect to the fan casing 16 without metal connection between the motor 17 and the fan casing 16. As a result, the vibration of the motor 17 is absorbed, and the vibration transmitted to the fan casing 16 through the first mounting leg 20 is prevented.

As described above, according to the vibration isolation device for the fan motor of the first embodiment of the present invention, the vibration isolation rubber 12 on the fan side prevents the fan 15 from resonating with the motor shaft 9, thereby preventing the vibration on the motor side. The vibrating rubbers 19 and 22 prevent the vibration generated from the motor 17 from being transmitted to the fan casing 16. Therefore, even if the rotation speed control of the fan motor is frequently performed, it is possible to prevent the generation of unpleasant vibration and noise.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. As shown in the figure, a ring-shaped motor-side anti-vibration rubber 24 holding the rear-side bearing 18 of the motor 17 and a ring-shaped motor-side anti-vibration rubber 25 holding the front-side bearing 21 of the motor 17 are made of silicone foam. Is molded into a three-layer structure having a dense structure on the surface and a bubble structure on the inside, and the other structures are the same as those of the first embodiment.

In the above structure, when the fan 17 is driven at a low speed by the motor 17, the low-frequency vibration of the motor 17 is absorbed by the deformation of the internal bubble portion 26 of the motor-side vibration-proof rubbers 24 and 25, and the first mounting leg. Vibration transmitted through the fan 20 to the fan casing 16 is prevented.

As described above, according to the vibration isolation device for the fan motor of the second embodiment of the present invention, the vibration is generated from the motor 17 by the vibration damping rubbers 24 and 25 on the motor side, which are formed by molding with foamed silicon. Since the low frequency vibration is prevented from being transmitted to the fan casing 16, even if the rotation speed control of the fan motor is frequently performed, or even when the fan motor is operated at a low speed, uncomfortable vibration and noise are not deteriorated without impairing the flame retardancy. Can be prevented.

Next, a third embodiment of the present invention will be described with reference to FIGS. 6 and 7. The same parts as those of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. As shown in the drawing, an annular motor-side anti-vibration rubber 27 that holds the rear bearing 18 of the motor 17 and an annular motor-side anti-vibration rubber 28 that holds the front bearing 21 of the motor 17 are installed inside. It has a three-layer structure in which a low hardness vibration isolating rubber 29 having a hardness of 10 degrees or less is formed, and a high hardness vibration isolating rubber 30 having a hardness of 25 degrees or more including the low hardness vibration isolating rubber 29 is formed outside. The configuration of is the same as that of the first embodiment.

In the above structure, when the fan 17 is driven at a low speed by the motor 17, the low frequency vibration of the motor 17 is absorbed by the deformation of the internal low hardness vibration damping rubber 29 of the motor side vibration damping rubbers 27 and 28. The vibration transmitted to the fan casing 16 through the mounting legs 20 is prevented.

As described above, according to the vibration isolator for the fan motor of the third embodiment of the present invention, the low hardness vibration isolator 29 is provided inside.
And a high hardness vibration isolating rubber 30 including the low hardness vibration isolating rubber 29 is formed on the outside.
Since the vibrations generated from the motor 17 are prevented from being transmitted to the fan casing 16 by and 28, the flame retardancy is impaired even when the rotation speed control of the fan motor is frequently performed or the fan motor is operated at a low speed. It is possible to prevent the generation of unpleasant vibration and noise.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 8 and 9. The same parts as those of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. As shown in the figure, a recess 33 is formed in the surface of the flange 32 of the main plate fixture 31 on the side opposite to the main plate, and the fan-side vibration-damping rubber 36 is provided in the recess 33, the inner surface of the tubular portion 34, and the blade boss 1.
1 and the outer surface of No. 1 are bonded by vulcanization adhesion to form the blade boss group 35, and the other structures are the same as those of the first embodiment.

In the above structure, when the fan 17 is driven by the motor 17, the vibration damping rubbers 24 and 25 on the motor side are provided.
Thus, the vibration of the motor 17 is absorbed, the transmission of the vibration to the fan casing 16 through the first mounting leg 20 can be prevented, and the resonance between the motor shaft 9 and the fan 15 is prevented by the fan-side vibration isolation rubber 36. In addition, the vibration of the main plate 2 forming the fan 15 in the axial direction is prevented by the vibration damping rubber 3 on the fan side.
It can be prevented by the recess 33 of the flange 32 of 6.

As described above, according to the vibration isolator for the fan motor of the fourth embodiment of the present invention, the flange 32 formed on the main plate mounting member 31 is provided with the recess 33, and the fan side anti-vibration rubber 3 is provided.
Since the outer peripheral surface of the blade boss 11 is connected to the inner surface of the cylindrical portion 34 and the recess 33 of the flange 31 by vulcanization adhesion, it is possible to prevent axial displacement of the main plate of the fan.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. The first
The same parts as those of the embodiment are given the same numbers and their detailed description will be omitted. As shown in the figure, a recess 33 is formed on the surface of the flange 32 of the main plate mounting member 31 on the side opposite to the main plate, and the fan-side anti-vibration rubber 37 foams the recess 33, the inner surface of the tubular portion 34, and the outer surface of the blade boss 11. The blade boss set 38 is integrally molded with silicon to form a three-layer structure in which the inside is a bubble state and the outside is a dense state. The other configurations are the same as those of the first embodiment. .

In the above structure, when the motor 17 drives the fan 15 at a low speed, the vibration damping rubbers 24 and 25 on the motor side absorb the low frequency vibration of the motor 17,
Vibrations can be prevented from being transmitted to the fan casing 16 through the first mounting leg 20, and low-frequency resonance between the motor shaft 9 and the fan 15 is prevented by the deformation of the internal bubble portion 39 of the fan-side vibration-proof rubber 37. In addition, the axial deviation of the main plate 2 forming the fan 15 can be prevented by the recess 33 of the flange 32 of the fan-side vibration-proof rubber 37.

As described above, according to the vibration isolator for the fan motor of the fifth embodiment of the present invention, the fan-side anti-vibration rubber 37 is integrally molded with foamed silicone, so that the fan 15 and the motor are It is possible to prevent low-frequency resonance of the shaft 9 and shake of the main plate 2 in the axial direction.

[0033]

As is apparent from the above description of the embodiments, according to the present invention, the cylindrical portion fitted in the central portion of the main plate provided with a large number of blades and the flange attached to the main plate are provided. A fan provided with a main plate mounting member, a cylindrical blade boss into which a motor shaft is inserted, and a fan-side anti-vibration rubber provided between the outer periphery of the blade boss and the cylindrical portion of the main plate mounting member, and this fan And a fan casing that stores
An end portion is attached to the fan casing, and a first mounting leg having an annular anti-vibration rubber for holding the rear bearing portion of the motor in the center portion, and the first mounting leg,
A second mounting leg having an annular vibration-proof rubber for holding the front bearing portion of the motor is provided, and the fan is mounted on the motor shaft via a mounting means. It is possible to provide an anti-vibration device for a fan motor that produces less unpleasant vibration and noise even if the above operation is frequently performed.

Further, since the motor-side anti-vibration rubber is molded with foamed silicone to form a bubble structure inside and a dense structure outside, flame resistance is maintained and uncomfortable low level is maintained even when the fan motor rotates at a low speed. An anti-vibration device for a fan motor can be provided that produces less vibration and noise at high frequencies.

Further, even if the motor-side anti-vibration rubber is formed to have a low-hardness anti-vibration rubber structure inside and a high-hardness anti-vibration rubber structure inside, even if the fan motor rotates at low speed, the anti-vibration property is maintained and uncomfortable It is possible to provide a vibration isolation device for a fan motor that generates less low-frequency vibration and noise.

Further, since the flange formed on the main plate mounting member is provided with a recess, and the fan-side anti-vibration rubber is joined by vulcanizing and adhering the outer periphery of the blade boss, the inner surface of the cylindrical portion and the flange recess, the fan vibration damping rubber is joined. Prevents the main plate from shaking in the axial direction,
It is possible to provide a vibration isolation device for a fan motor with less vibration and noise.

Further, since the fan-side anti-vibration rubber is integrally molded with foamed silicon, low-frequency resonance between the fan and the motor shaft is prevented and the main plate of the fan is prevented from being shaken in the axial direction. As a result, it is possible to provide a vibration isolation device for a fan motor with less vibration and noise.

[Brief description of drawings]

FIG. 1 is a sectional view showing a vibration isolation device for a fan motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a blade boss assembly of the vibration isolation device for the fan motor.

FIG. 3 is an enlarged view of a vibration isolation device for the fan motor.

FIG. 4 is a cross-sectional view of a motor-side anti-vibration rubber of a fan motor anti-vibration device according to a second embodiment of the present invention.

FIG. 5 is an enlarged view of the vibration isolation device for the fan motor.

FIG. 6 is a cross-sectional view of a motor-side anti-vibration rubber of a fan motor anti-vibration device according to a third embodiment of the present invention.

FIG. 7 is an enlarged view of the vibration isolation device for the fan motor.

FIG. 8 is a sectional view of a blade boss assembly of a vibration isolator for a fan motor according to a fourth embodiment of the present invention.

FIG. 9 is an enlarged view of a vibration isolation device for the fan motor.

FIG. 10 is a sectional view of a blade boss assembly of a vibration isolator for a fan motor according to a fifth embodiment of the present invention.

FIG. 11 is an enlarged view of a vibration isolation device for the fan motor.

FIG. 12 is a cross-sectional view showing a conventional vibration isolation device for a fan motor.

[Explanation of symbols]

 1 Blade Office 2 Main plate 3 Cylindrical part 4 Flange 5 Main plate mounting tool 9 Motor shaft 11 Blade boss 12 Fan side vibration isolating rubber 15 Fan 16 Fan casing 17 Motor 18 Rear bearing part 19 Motor side vibration isolating rubber 20 First installation Leg 21 Front bearing 22 Motor side anti-vibration rubber 23 Second mounting leg 24 Motor side anti-vibration rubber 25 Motor side anti-vibration rubber 27 Motor side anti-vibration rubber 28 Motor side anti-vibration rubber 29 Low hardness anti-vibration rubber 30 High Hardness anti-vibration rubber 31 Main plate mounting tool 32 Flange 33 Recess 34 Cylindrical part 36 Fan-side anti-vibration rubber 37 Fan-side anti-vibration rubber

Claims (5)

[Claims] 1. A main plate fixture having a cylindrical portion fitted in the central portion of a main plate provided with a large number of blades and a flange attached to the main plate, a cylindrical blade boss into which a motor shaft is inserted, and this blade. A fan provided with a fan-side anti-vibration rubber provided by vulcanization adhesion between the outer periphery of the boss and the tubular portion of the main plate fixture, a fan casing for accommodating the fan inside, and an end portion of the fan casing. And a first mounting leg having an annular motor-side anti-vibration rubber for holding the rear bearing portion of the motor in the center, and the front bearing portion of the motor mounted on the first mounting leg. And a second mounting leg provided with a ring-shaped motor-side anti-vibration rubber for holding the fan. The fan-motor anti-vibration device is configured to be mounted on the motor shaft via mounting means. 2. The vibration isolation device for a fan motor according to claim 1, wherein the vibration isolation rubber on the motor side is formed by molding silicone foam. 3. The fan according to claim 1, wherein the vibration damping rubber on the motor side is formed of a low hardness vibration damping rubber inside, and a high hardness vibration damping rubber including this low hardness vibration damping rubber is formed outside. Anti-vibration device for motors. 4. A structure in which a concave portion is provided on a flange formed on the main plate mounting member, and the fan-side anti-vibration rubber is bonded by vulcanizing and adhering the outer periphery of the blade boss, the inner surface of the cylindrical portion and the flange concave portion. The vibration isolation device for a fan motor according to 2 or 3. 5. The fan-side anti-vibration rubber is formed by integrally molding the outer periphery of the blade boss, the inner surface of the tubular portion, and the flange recess with foamed silicon.
The vibration isolation device for a fan motor according to item 3 or 4.