JPH05168188A - Vibration isolator to fan motor - Google Patents

Abstract

PURPOSE:To eliminate unpleasant vibration or noise by breaking the transmission of vibration to the body of a room air conditioner or the body of a hot-water supplier where fan case is installed. CONSTITUTION:This vibration isolator is equipped with a fan case 19, the circular part 2 on the anti-suction side of which is attached through a motor mounting plate 3 to a motor 11 having a fan 21 installed, and the fan case 19 is attached to the motor 11 through vibration-proof rubber 1, which is interposed between the motor mounting plate 3 and the circular part, engaging with the circular part of the fan case and engages with the motor mounting plate 3.

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 room air conditioner, a water heater or the like.

[0002]

2. Description of the Related Art In recent years, the number of revolutions of a fan motor has been frequently controlled from the viewpoint of ventilation or combustion efficiency, and the fluctuation of vibration of the fan motor has become larger and larger.
The generation of unpleasant vibration and noise tends to increase.

A conventional fan motor of this type is shown in FIG.
Also, description will be made with reference to FIG. As shown in the figure,
The motor 11 is composed of a stator 12 and a rotor 13,
A permanent magnet 14 is arranged on the rotor 13 and a rotor shaft 15
Was fixed to. In addition, the rotor 13 is a bearing 16
It is rotatably provided on the motor frame 11a of the motor 11 provided with the stator 12 via the. A motor mounting plate 17 is fixed to the motor frame 11a with bolts 18, and a fan case 19 is attached via the motor mounting plate 17.
In addition, the fan 20 is fixed to the rotor shaft 15 by the bolt 20, and the fan 21 is fixed to the rotor shaft 15 by the nut 22.

Further, in order to prevent vibration transmission to the room air conditioner main body and the water heater main body, as shown in FIG. 5, the bolt 2 for mounting the motor mounting plate 17 and the fan case 19 is simply used.
If the vibration damping rubber 23 is only interposed between 0, the entire weight of the motor 11 is added to the vibration damping rubber 23, so that the dimension L of the vibration damping rubber 23 between the motor mounting plate 17 and the bolt 20 is not significantly increased. The vibration generated by the motor 11 is transmitted to the fan case 19 side as shown by the arrow 24. In addition, anti-vibration rubber 2 to increase the vibration prevention effect.
It was difficult to increase the dimension L of 3 due to the mounting space of the motor 11 and the cost.

[0005]

In the conventional fan motor, when the motor 11 rotates due to the rotating magnetic field of the stator 12, the vibration generated by the rotation is transmitted to the fan case 19, and the room air conditioner body to which the fan case 19 is mounted is mounted. , Or vibrating the water heater itself, causing unpleasant vibrations,
There was a problem that noise was generated.

The present invention solves the above problems and provides a vibration isolation device for a fan motor that shuts off vibration transmission to the room air conditioner main body or the water heater main body to which the fan case is attached and does not generate unpleasant vibration or noise. The purpose is to provide.

[0007]

In order to achieve the above-mentioned object, a vibration isolation device for a fan motor according to the present invention comprises a motor to which a fan is attached and an annular portion on the side opposite to the suction side through the motor attachment plate. With a fan case that can be attached,
The fan case is attached to the motor through an anti-vibration rubber that engages with the annular portion of the fan case and is interposed between the motor mounting plates.

[0008]

According to the present invention, since the anti-vibration rubber is engaged with both the annular portion of the fan case and the motor mounting plate as in the above-mentioned structure, it is possible to increase the volume of the anti-vibration rubber. The vibration generated by the rotation of the motor is absorbed by the anti-vibration rubber to prevent the vibration from being transmitted to the fan case.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. The same parts as those of the conventional example are designated by the same reference numerals and detailed description thereof will be omitted. As shown in the figure, the vibration-proof rubber 1 is integrally formed with an annular packing portion 1a that engages with the annular portion 2 of the fan case 19 and an annular protrusion 1b with which the groove 3a formed in the motor mounting plate 3 engages. To form.

In the above structure, when the fan case 19 is attached, after the packing portion 1a of the vibration isolating rubber 1 is attached to the inner diameter 2a of the annular portion 2 of the fan case 19, the bolt 20 is inserted into the grooved annular protrusion 1b. And is screwed to the annular portion 2 of the fan case 19 to be attached.

With the above-described structure, the motor 11
Self-weight is the packing part 1a of the anti-vibration rubber 1 and the fan case 1
Since it is received by the annular portion 2 of 9, it is possible to increase the volume of the anti-vibration rubber 1, and it is possible to significantly absorb and damp vibrations.

Further, as a result of measuring the vibration reducing effect of the fan motor having the above-mentioned structure, as shown in FIG. 3, the fan motor B of the present invention has a vibration level significantly reduced over the whole as compared with the conventional fan motor A. I was able to confirm that it is doing.

[0013]

As is apparent from the above embodiments, according to the present invention, the vibration-proof rubber which engages with the annular portion of the fan case and is interposed between the motor mounting plates and which engages with the motor mounting plate. Since the fan case is attached to the motor via the above, it is possible to provide a vibration isolating device for a fan motor that can reduce vibration at a low cost by using the vibration isolating rubber as a packing structure in addition to the vibration reducing effect.

[Brief description of drawings]

FIG. 1 is a sectional view of a fan motor according to an embodiment of the present invention.

FIG. 2 is a partially cutaway exploded perspective view showing a mounting state of the vibration isolator.

FIG. 3 is a vibration acceleration-frequency characteristic diagram of the vibration isolator.

FIG. 4 is a partially cutaway cross-sectional view of a fan motor in which a conventional anti-vibration rubber is not attached.

FIG. 5 is a cross-sectional view showing a state in which the rubber vibration isolator is attached.

[Explanation of symbols]

 1 anti-vibration rubber 2 annular part 3 motor mounting plate 11 motor 19 fan case 21 fan

Front page continuation (72) Inventor Akihiko Watanabe 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Fumitoshi Yamashita, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A motor having a fan attached thereto, and a fan case to which an annular portion on the side opposite to the suction side is attached to the motor via a motor attachment plate, the motor attaching by engaging with the annular portion of the fan case. An anti-vibration device for a fan motor, wherein the fan case is attached to a motor via an anti-vibration rubber that is interposed between the motor mounting plate and the motor mounting plate.