JPS6034996Y2 - Ventilation fan soundproofing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soundproofing device for a ventilation fan that deals with outdoor noise that enters through the ventilation fan body.

Ventilation fans are generally fitted into openings formed in room walls to exhaust indoor air outdoors during ventilation operation, but there is a problem that outdoor noise can enter the room through the ventilation fan itself. For this reason, in the past, sound-absorbing plates equipped with sound-absorbing materials were arranged in a staggered pattern inside a sound-absorbing casing to form a meandering labyrinth-like ventilation passage, and this sound-absorbing casing was connected to a ventilation fan to reduce outdoor noise. Sound was absorbed by the sound-absorbing casing, but in order to increase the sound-absorbing effect with this casing, we had to increase the number of sound-absorbing plates and increase the number of bends in the meandering ventilation passage, and at the same time make the overall length of the ventilation passage as long as possible. Therefore, the length of the sound-absorbing region made of the sound-absorbing material must be increased, which has the disadvantage that the sound-absorbing casing inevitably becomes large and occupies a large amount of installation space.

The present invention has been made to eliminate the above-mentioned drawbacks, and its purpose is to provide a soundproofing device for a ventilation fan that can be constructed in a small size, can effectively absorb outdoor noise, and can greatly improve the indoor soundproofing effect. .

A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

1 is a mounting opening formed in a wall 2 of a room such as a living room;
Reference numeral 3 denotes a rectangular outer frame that is fitted into this mounting opening 1 via a wooden frame 2a and has openings on both indoor A and outdoor B sides. A ventilation fan main body 8 includes a ventilation fan 7 fitted to a rotation shaft 6 of a motor 5.

Numeral 9 is a bell mouth fitted on the indoor A side of the outer frame 3, and 10 is a shirt flap piece pivotally installed in multiple stages on the outdoor B side of the outer frame 3.

11 is a sound-absorbing casing with a flat box shape, and this sound-absorbing casing 11 has a connecting tube 1 protruding from its back surface.
It is connected to the bell mouth 9 via the ventilating fan body 8 via the ventilating fan body 8.

Reference numeral 13 denotes a first vent hole formed in the center of the back surface of the sound-absorbing casing 11 so as to communicate with the bell mouth 9;
4 is a second vent formed by opening the outer circumference of the sound absorbing casing 11, for example, the bottom surface, and 15 is a second vent formed in a spiral shape from a sound absorbing material made of glass wool, rock wool, urethane foam, etc. A spiral ventilation passage 16 is formed by this cylinder wall body 15 in the sound absorbing casing 11, and each of the first and second ventilation holes 13 and 14 This ventilation passage 1
6 and communicate with each other.

Note that 17 is a reinforcing porous plate attached to one side of the cylindrical wall 15, and 18 is a reinforcing porous plate 18 attached to the other circumferential surface of the cylindrical wall 15 to prevent fine hairs from coming out of glass wool, rock wool, etc. It is a woven cloth.

Moreover, 19 is a grill fitted into the second vent hole 14 of the sound-absorbing casing 11.

Next, the operation of the above configuration will be explained.

Now, when the motor 5 is energized, the shirt flap piece 10 is rotated upward by the wind pressure, and the rotation of the ventilation fan 7 causes the indoor A
A ventilation operation is performed in which the air is sucked into the ventilation path 16 from the grill 19, thus the second vent 14, and then sucked into the outer frame 3 through the second vent 13 and exhausted to the outdoors B. It will be done.

By the way, especially during ventilation operation when the shirt flap piece 10 is opened, the noise from outside B directly enters the outer frame 3, but the noise is absorbed by the cylindrical wall cut out from the sound absorbing material before reaching the room A through the ventilation passage 16. It is absorbed by the sound absorbing action of the body 15, and as a result, the noise from outside B hardly ever enters into the room A.

Moreover, since the ventilation passage 16 of the sound absorption casing 11 is formed in a spiral shape, the ventilation passage 16 can be made smaller even when the sound absorption casing 11 is made smaller than the conventional ventilation passage formed in a meandering labyrinth.
The length of the cylindrical wall body 1 made of sound absorbing material can be increased dramatically.
The length of the sound absorption area No. 5 can be significantly increased, and as a result, the noise outside B can be effectively reduced even though the device is small.

In particular, in this embodiment, the sound-absorbing casing 11 can be attached to the ventilation fan main body 8 by simply connecting it to the bell mouth 9 via the connecting tube 12. It is also convenient to install.

Although this embodiment is applied to a device equipped with a shirt flap 10, it can also be applied to a device not equipped with a shirt flap.

In this case, noise tends to enter the room through the outer frame regardless of whether the ventilation is in operation or stopped, but it goes without saying that the room is soundproofed as in the first embodiment.

Next, a second embodiment of the present invention will be described with reference to FIG. 3, in which the same parts as those in the first embodiment are denoted by the same reference numerals.

In FIG. 3, the cylindrical wall body 20 is sequentially bent inward by 9 degrees from the second vent 14 of the sound-absorbing casing 11 toward the first vent 13, so that the ventilation passage 16 is formed into a rectangular spiral shape. is formed.

With this configuration, the noise reaches the bent corner of the ventilation passage 16 at a large angle of incidence of approximately 90 degrees, so each time the noise reaches a corner, the sound is absorbed to an almost geometrical progression, and the noise is further absorbed. Achieves high indoor soundproofing effects.

In this embodiment, the sound absorbing casing 11 is attached to a bell mouth 9.
However, the present invention is not limited to this, and the sound absorbing casing 11 may be connected to the outdoor B side of the outer frame 3, or may be integrally molded with the bell mouth 9 or the outer frame 3.

As described above, in this invention, the ventilation passage is formed in a spiral shape, so the length of the ventilation passage can be increased even if the sound-absorbing casing and the overall size are made smaller.This also lengthens the sound-absorbing area of the sound-absorbing material. Therefore, it is possible to provide a soundproofing device for a ventilation fan that is small in size yet can absorb outdoor noise with high efficiency, and can significantly improve the indoor soundproofing effect.

[Brief explanation of the drawing]

Figures 1 and 2 show the first embodiment of the present invention.
FIG. 1 is a longitudinal sectional view of the whole, FIG. 2 is a longitudinal sectional view of the sound absorbing casing, and FIG. 3 is a view corresponding to FIG. 2 showing another embodiment of the present invention. In the figure, 7 is a blower fan, 8 is a ventilation fan body, 11 is a sound-absorbing casing, 13 is a first vent, 14 is a second vent, 15.20 is a cylindrical wall (sound-absorbing material), and 16 is a ventilation It is a road.

Claims (1)

[Claims for Utility Model Registration] 1. A sound-absorbing casing is connected to a ventilation fan body in which a blower fan is installed, and a first vent communicating with the ventilation fan body is formed in the center of the sound-absorbing casing. 1. A soundproofing device for a ventilation fan, characterized in that a second ventilation hole is formed in the outer periphery of a ventilation fan casing, and the two side openings are communicated through a spiral ventilation path whose wall portion is made of a sound-absorbing material. 2. The soundproofing device for a ventilation fan according to claim 1 of the utility model registration, wherein the ventilation passage is formed in a rectangular spiral shape.