JP2002235804A - Turbo fan having vibration insulation function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the bearing vibration insulation boss part of a turbo fan to couple a motor rotary shaft, in a turbo fan having a vibration isolation function. SOLUTION: In a turbo fan having a vibration insulation function, an outer wheel cylinder 23 is integrally molded with a boss part 20 of a fan body 21 through insert molding or by a mold. An annular lock part 23f protruding internally is formed at the rear end of the outer wheel cylinder 21 and a taper surface 23d decreased in size toward a rear end is formed on an inner peripheral surface. A vibration insulation absorbing cylinder 25 is fixed on the outer peripheral surface of an inner wheel cylinder 24 by an adhesive 27. A taper surface having a similar inclination angle as that of a taper surface 23 formed on the inner peripheral surface of the outer wheel cylinder 23 and a stepped part 25c engaged with the lock part 23f are formed in the outer peripheral surface of a vibration insulation cylinder 27, and the two parts are mechanically assembled together through a male and female system by taper surface joining.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbofan applied to a blower such as an air conditioner, and more particularly to a turbofan having an anti-vibration function.

[0002]

2. Description of the Related Art Conventionally, an inner race fitted to a rotating shaft of a motor and an outer race fitted to a boss portion of a turbofan body are each formed into a cylindrical shape with hard resin, and the inner race and the outer race are formed. The soft resin cylinder is simultaneously formed in the gap with insert molding, so that the rotational vibration of the motor's rotating shaft is absorbed by the soft resin cylinder, the vibration transmission from the turbo fan body is absorbed, and the noise due to vibration is prevented. A vibration-absorbing cylinder made of an elastic member such as rubber or the like having a vibration-proof function, or comprising the inner race and the outer race with a metal tubular part, and fitting the inner race and the outer race with a fitting gap between the inner race and the outer race. There is already known a configuration in which the vibration is absorbed by a vibration-absorbing absorption cylinder to prevent noise due to the vibration, which is provided in close contact with the rotating shaft of the motor.

FIGS. 1 and 2 illustrate the structure of a turbofan having an anti-vibration function according to the prior art.
In the figure, reference numeral 3 denotes an anti-vibration boss mounted on the rotating shaft 2 of the motor 1. The anti-vibration boss 3 is fixed to a through hole 5a for mounting the boss 5 of the turbofan main body 4. 1 is transmitted to the turbo fan body 4.

[0004] The vibration-proof boss portion 3 is shown in FIG.
As shown in (b), the concentric sleeve-shaped metal inner ring cylinder 6 and the outer ring cylinder 7 have an appropriate hardness having a vibration-proof function to be filled in the gap between the inner ring cylinder 6 and the outer ring cylinder 7. A vibration-absorbing cylinder 8 made of elastic rubber or soft resin, and the vibration-absorbing cylinder 8 is fixed to a gap between an outer peripheral surface of the inner ring cylinder 6 and an inner peripheral surface of the outer ring cylinder 7 with an adhesive. It is a thing. The rotating shaft 2 of the motor 1 is inserted into a through hole of the inner race 6 of the vibration isolating boss 3, and a nut is inserted through a holding plate 9 fitted into a screw portion protruding from a tip end of the vibration isolating boss 3. 10 are screwed together to fix them.

[0005]

However, the formation of the anti-vibration boss portion in the conventional turbofan described above requires the inner cylinder 6
Although a soft resin cylinder or rubber vibration-absorbing cylinder 8 is formed between the outer ring cylinder 7 and the outer ring cylinder 7 by insert molding, the vibration-absorbing cylinder 8 made of a soft resin or rubber molded at a high temperature is used.
Is likely to cause thermal shrinkage at cooling or normal temperature, so that the bonding strength of the bonding surface with the inner ring cylinder 6 and the outer ring cylinder 7 is weakened, or a strong load due to high speed rotation or a change in aging due to aging, etc. The vibration-absorbing cylinder 8 made of the soft resin or rubber or the like by cracking and peeling off.
Is prevented from slipping out of the inner race 6 and the outer race 7 or being unable to completely transmit the rotation of the rotating shaft 2 of the motor 1 to the turbo fan body 4 via the vibration isolating boss 3 and causing idling. I can't.

Further, in the case where the inner ring cylinder 6 and the outer ring cylinder 7 are made of metal, and the vibration damping absorption cylinder 8 is joined to the outer and inner peripheral surfaces of the inner ring cylinder 6 with adhesives 8a and 8b, Since the joining surfaces of the inner ring 6 and the outer ring 7 are rough, the adhesive 8a,
8b is incompletely joined, and when the anti-vibration absorption cylinder 8 is thermally contracted after molding, the inner and outer joints of the inner and outer ring cylinders 6, 7 are unbalancedly pulled by the anti-vibration absorption cylinder 8, Inner ring 6,
When the outer cylinder 7 is slightly inclined with respect to the rotating shaft 2 of the motor, it causes rotation vibration and noise, and also processes and forms the anti-vibration boss portion and the fan boss portion 5.
There is a problem that it takes a lot of man-hours to fix the device, and it becomes very expensive.

The present invention solves the above-mentioned problems, and in a configuration of a vibration isolating boss portion of a turbofan, wherein the outer cylinder is integrally molded with a boss section of a fan body by insert molding or a mold, and An annular locking portion protruding inward at a rear end portion, and a tapered surface having a tapered rear end portion on an inner peripheral surface, and the vibration-absorbing absorption cylinder bonded to an outer peripheral surface of the inner ring cylinder with an adhesive. The tapered surface having the same inclination angle as the tapered surface formed on the inner peripheral surface of the outer ring cylinder and the stepped portion engaging with the locking portion are formed on the outer peripheral surface of the vibration-proof absorbing cylinder. The influence of the deformation at the time of thermal shrinkage of the vibration-absorbing absorber can be reduced by mechanically assembling the inner cylinder to which the vibration-absorbing absorber is fixed in the outer cylinder, by fitting the inner cylinder into which the vibration-absorbing cylinder is fixed. Anti-vibration so as not to give to the boss An object of the present invention is to provide a turbo fan having a function.

[0008]

According to a first aspect of the present invention, there is provided a turbo fan having an anti-vibration function, wherein the anti-vibration bosses disposed between the bosses of the turbofan body are provided with inner and outer ring cylinders. And a vibration-absorbing cylinder formed by an elastic member interposed therebetween, and a nut of a rotating shaft of the motor fitted into the through-hole of the inner cylinder is fixed at a tip end side of the inner cylinder via a holding plate. In a turbo fan having an anti-vibration function that drives the turbo fan with the rotational force of the motor,
The outer cylinder is integrally molded with the boss of the fan body by insert molding or a mold, and an annular locking portion protruding inward at a rear end of the outer cylinder, and a rear end tapered on an inner peripheral surface. And an anti-vibration absorbing cylinder fixed to the outer peripheral surface of the inner race cylinder with an adhesive, and a taper formed on the inner peripheral surface of the outer race cylinder is formed on the outer peripheral surface of the vibration isolating absorption cylinder. A tapered surface having the same inclination angle as the surface and a stepped portion to be engaged with the locking portion are formed, and the inner ring cylinder to which the vibration damping absorption cylinder is fixed is fitted into the outer ring cylinder by an assembling method. It is characterized by.

According to a second aspect of the present invention, in the turbo fan having the vibration damping function according to the first aspect, the boss portion or the outer race is formed with a flat portion extending in the axial direction on the front and rear surfaces of the inner peripheral wall surface. It is characterized by having done.

According to a third aspect of the present invention, in the turbofan having the vibration isolating function according to the first aspect, flat portions extending in the axial direction are formed on the front and rear surfaces of the outer periphery of the vibration absorbing absorber. And

According to a fourth aspect of the present invention, there is provided the turbofan having an anti-vibration function according to the first aspect, wherein a rectangular hole having a through hole through which a threaded small-diameter portion of the rotary shaft penetrates is formed at a tip of the inner race. A notch surface on which a flat pressing plate is mounted is formed.

According to a fifth aspect of the present invention, in the turbo fan having the vibration isolating function according to the first aspect, a large-diameter portion is loosely fitted to a middle diameter portion of the rotating shaft at a tip end of the vibration boss portion. The turbo fan having an anti-vibration function according to claim 1, further comprising an annular elastic member and a washer locked at the stepped portion.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A turbo fan having an anti-vibration function according to an embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a cross-sectional view of a main part of a turbo fan having a vibration isolating function according to a first embodiment of the present invention, in which the turbo fan is attached to a rotating shaft of a motor via a vibration isolating boss.
4A and 4B show an outer race tube constituting a vibration isolating boss portion, wherein FIG. 4A is a half sectional view of a front view, and FIG. 4B is a bottom view. 5A and 5B show a state in which an anti-vibration absorbing cylinder is adhered and fixed to an inner ring cylinder constituting an anti-vibration boss portion, wherein FIG. 5A is a half sectional view of a front view, and FIG. 5B is a bottom view.

In FIG. 1, reference numeral 20 denotes an anti-vibration boss mounted on a boss 22 of a turbo fan body 21.
Is constituted by a metal outer ring cylinder 23 formed in a cylindrical shape, and a vibration-proof absorption cylinder 25 made of rubber or the like, which is an elastic member fixed to the outer peripheral surface of the metal inner ring cylinder 24 with an adhesive 27, The anti-vibration absorption cylinder 25 is located between the outer race 23 and the inner race 24.

Further, the outer race 23 is shown in FIG.
(B), the outer peripheral surface 23a is formed straight, has an annular concave portion 23b near the front end, and has a knurl 23c for preventing slippage near the rear end. Further, the inner peripheral surface has a tapered surface 23d whose diameter decreases toward the rear end side, and a flat surface 23e formed only on the front and rear surfaces in the outer peripheral axis direction. A locking portion 23f protruding in the direction is formed.

On the other hand, as shown in FIGS. 5A and 5B, an anti-vibration absorption cylinder 25 bonded to the outer peripheral surface of the inner race 24 with an adhesive 27 has an outer peripheral surface 25a which is fixed to the outer race. A tapered surface 25b having an inclination angle similar to that of the tapered surface 23d of the outer ring 23 is formed, and an annular small-diameter stepped portion 25c that is locked by the locking portion 23f of the outer race 23 is formed around the rear end portion. And flat surfaces 25d for rotation prevention are provided on the front and rear surfaces, respectively. The tip of the inner race 24 protrudes from the tip of the anti-vibration absorption cylinder 25, and the projection 26 has a cutout surface 26a on which a rectangular pressing plate 28 described later is mounted. .

Further, on the rear end side of the vibration isolating boss portion 20 composed of the inner and outer wheel cylinders 23, 24 and the vibration isolating absorption cylinder 25, a middle diameter portion 31b of the rotating shaft 31 of the motor is arranged from the distal end side. A loosely fitted annular elastic member 31d and a washer 31e
Is mounted and is locked by the step portion 34 of the large-diameter portion 31a of the rotary shaft so as to prevent the anti-vibration boss portion 20 from coming off due to floating.

The anti-vibration boss 2 constructed as described above
Reference numeral 0 denotes an annular raised portion 29a which is fitted to a mounting through hole 29 formed in the boss portion 22 of the turbofan main body 21, and the outer ring tube 23 and the outer ring tube 2
3 and the concave portion 23b formed on the outer peripheral surface 23a by elastic deformation. Then, an anti-vibration absorber 25 is fixed to the outer peripheral surface of the inner race 24 with an adhesive 27 so that a flat surface 25 d of the anti-vibration absorber 25 and a flat surface 23 e formed on the inner surface of the outer race 23 are aligned with each other, With the rotation restricted, the rear end portion is wedge-fitted into the outer ring cylinder 23 from the side of the small diameter tapered surface by taper surface joining, and the locking portion 23f and the stepped portion 25c are engaged with each other, so that the vibration isolating boss is formed. The mounting of the part 20 is completed.

Thereafter, an annular elastic member 31d and a washer 31e are mounted on the rotating shaft 31 of the motor 30, and the inner ring tube 24 of the vibration isolating boss 20 fixed to the boss 22 of the turbofan body 21 is mounted. The rotating shaft 31 is inserted into the through hole 24a.
Of the inner ring cylinder 24, and is prevented from falling off by a nut 33 via a rectangular holding plate 28 attached to a cutout surface 26 a formed in a protruding portion 26 protruding from the tip of the inner ring cylinder 24. The rotation of the motor is controlled by the vibration isolating boss 20.
Through the fan main body 21.

The rotating shaft 31 has a large diameter portion 31a extending from the inside of the motor 30 from the rear end to the front end.
A middle diameter portion 31b penetrating through the inside of the inner ring cylinder 34 via a stepped portion 34, and a small diameter portion 31c with a screw protruding toward the distal end side of the inner ring cylinder 34. The small diameter portion 31c has a notch in the axial direction. A flat portion 31d is formed, and is penetrated through a D-shaped cut hole 28a formed in the holding plate 27 so as to prevent rotation.

The first embodiment of the present invention configured as described above
As shown in FIG. 3, the turbo fan having an anti-vibration function according to the embodiment, as shown in FIG. An annular locking portion 23f protruding inward at the rear end of the outer cylinder 23, and a tapered surface 23d having a tapered rear end at the inner peripheral surface. The anti-vibration absorption cylinder 25 is fixed to the surface of the anti-vibration absorption cylinder 25 with an adhesive 27, and the outer peripheral surface 25a of the anti-vibration absorption cylinder 25 has a tapered surface 23d formed on the inner peripheral surface of the outer race cylinder 25.
Taper surface having the same inclination angle as that of the locking portion 23
By forming a step 25c that engages with the f and mechanically assembling them by a fitting method, the inner ring cylinder 24 and the outer ring cylinder 23 are separated from the vibration isolating absorption cylinder 25 by a gap. Preventing deformation of the inner and outer ring cylinders 23 due to thermal deformation,
In addition, the rotation of the motor shaft 31 and the fan main body 21 are prevented from coming off and idling is prevented, and the vibration of the rotation shaft 31 of the motor can be absorbed by the anti-vibration absorption cylinder 25, thereby preventing the noise caused by the vibration. . Also, the work of assembling the rotating shaft 31 of the motor and the turbofan main body 21 can be simplified, and the defect rate during product production can be greatly improved.

FIG. 6 shows a second embodiment of the present invention, which has substantially the same configuration as the above-described first embodiment.
In the second embodiment, the outer cylinder 23 to which the inner cylinder 24 to which the vibration-proof absorption cylinder 25 is adhered is omitted, and the configuration of the outer cylinder 23 in the first embodiment, that is, the inner cylinder is provided at the rear end. An annular locking portion 23f protruding toward the rear and a tapered surface 23d tapered toward the rear end side and a flat surface 23e for front and rear rotation prevention are formed through a through hole of the boss portion 41 of the turbofan main body 40. 42 is formed on the inner wall surface. Since other configurations are the same as those described in the first embodiment, the same portions are denoted by the same reference numerals and description thereof will be omitted.

In the second embodiment, the boss 41 of the fan body 40 has the function of the outer cylinder even if the outer cylinder 23 in the first embodiment is omitted.
The same operation and effects as those of the first embodiment are provided,
The work of assembling the rotating shaft of the motor and the turbofan can be further simplified, the defect rate during product production can be significantly improved, and the product can be provided at low cost.

[0024]

As described above, in the structure of the vibration isolating boss of the turbofan, the outer cylinder is inserted or molded integrally with the boss of the fan body, and protrudes inward from the rear end of the outer cylinder. An annular protrusion and a tapered surface with a tapered rear end formed on the inner peripheral surface, and a vibration-proof absorbing cylinder fixed to the outer peripheral surface of the inner ring cylinder with an adhesive; On the surface, a tapered surface having the same inclination angle as the tapered surface formed on the inner peripheral surface of the outer ring cylinder and a stepped portion to be locked to the projecting portion are formed, and both are mechanically assembled by a fitting method. With this configuration, it is possible to prevent deformation of the inner and outer cylinders due to thermal deformation of the vibration isolating cylinder interposed between the inner cylinder and the outer cylinder, and to prevent the inner peripheral surface of the outer cylinder and the vibration isolating cylinder from being deformed. Since the outer peripheral surface is wedge-coupled by taper, the two are securely connected. Together, there is an advantage that assembling work is facilitated.

Also, the motor shaft and the fan main body can be prevented from coming off and idling can be prevented, and the rotational vibration of the motor shaft can be absorbed by the anti-vibration absorbing cylinder, thereby preventing the noise caused by the vibration. Furthermore, the assembling work of the rotating shaft of the motor and the turbofan can be simplified, and the defect rate during product production can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a front view of a part cutaway of a turbofan having a vibration damping function according to a conventional invention.

FIGS. 2A and 2B are enlarged views of an anti-vibration boss in FIG. 1, wherein FIG.

FIG. 3 is a cross-sectional view of a main part of the first embodiment of the turbo fan having an anti-vibration function according to the present invention, in a state where the turbo fan is attached to a rotating shaft of a motor via an anti-vibration boss.

FIG. 4 shows an outer race that constitutes the anti-vibration boss of FIG. 3,
(A) is a half-mounted cross section of the front view, and (b) is a bottom view.

5A and 5B show a state in which an anti-vibration absorption cylinder is adhered and fixed to an inner ring cylinder constituting an anti-vibration boss part in FIG. 3, wherein FIG. 5A is a half-mounted cross section of a front view and FIG. 5B is a bottom view.

FIG. 6 is a diagram corresponding to FIG. 3, showing a second embodiment of a turbofan having an anti-vibration function according to the present invention.

[Explanation of symbols]

 Reference Signs List 20 Vibration-proof boss part 21 Turbo fan main body 22 Boss part 23 Outer ring tube 23a Outer surface 23b Recess 23d Tapered surface 23e Flat surface 23f Locking unit 24 Inner tube 24a Through hole 25 Vibration absorber 25a Outer surface 25b Tapered surface 25c Step Part 26 projecting part 26a notch surface 27 adhesive 28 holding plate 29 through hole 29a raised part 30 motor 31 rotating shaft 31a large diameter part 31b medium diameter part 31c small diameter part with screw

Claims (5)

[Claims] An inner ring includes a vibration isolating boss portion provided between boss portions of a turbofan body, an inner and outer ring cylinders, and a vibration isolating absorption cylinder formed by an elastic member interposed therebetween. A vibration isolating function is provided in which the rotating shaft of the motor fitted into the through hole of the cylinder is fixed to the distal end side of the inner ring cylinder with a nut via a holding plate, and the turbo fan is driven by the rotating force of the motor. In the turbo fan, the outer cylinder is integrally formed with a boss of a fan body by insert molding or a mold, and an annular locking portion protruding inward at a rear end portion of the outer cylinder, and a rear portion formed on an inner peripheral surface. An end portion is formed with a tapered surface which is tapered, and the anti-vibration absorbing cylinder is fixed to an outer peripheral surface of the inner race cylinder with an adhesive, and an inner peripheral surface of the outer race cylinder is fixed to an outer peripheral surface of the anti-vibration absorbing cylinder. And a taper surface having the same inclination angle as the taper surface formed on the surface A turbo fan having an anti-vibration function, wherein a step portion that engages with the locking portion is formed, and an inner ring cylinder to which the anti-vibration absorption cylinder is fixed is fitted into the outer ring cylinder by a fitting method. . 2. The turbo fan with vibration damping function according to claim 1, wherein the boss portion or the outer ring cylinder is formed with a flat portion extending in the axial direction on a front surface and a rear surface of an inner peripheral wall surface. . 3. The turbo fan having an anti-vibration function according to claim 1, wherein flat portions extending in the axial direction are formed on the front and rear surfaces of the outer periphery of the anti-vibration absorption cylinder. 4. A notch surface on which a rectangular flat pressing plate having a through hole through which a threaded small diameter portion of the rotating shaft penetrates is formed at a tip end of the inner ring cylinder. Item 7. A turbofan having the vibration isolation function according to Item 1. 5. An annular elastic member and a washer, which are loosely fitted to a middle diameter portion of the rotating shaft and locked at a step portion of a large diameter portion, are attached to a tip end side of the vibration boss portion. The turbo fan provided with a vibration isolation function according to claim 1.