JP2644943B2 - Duct ventilation fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation fan for a duct, which is mainly mounted on a ceiling surface of an office or a living room and is connected to a duct communicating with the outside to exchange indoor air.

[0002]

2. Description of the Related Art Heretofore, this type of duct ventilation fan has generally been configured as shown in FIGS. That is, a blower 106, which will be described later, is disposed inside a box-shaped ventilation fan main body 105 which is installed in the opening 102 of the ceiling 101 and has a suction port 103 on the lower surface and a discharge port 104 on one side. I have. The blower 106 includes an electric motor 108 to which the blades 107 are fixed, a steel plate ventilation casing 110 that covers the outer periphery of the blades 107 to form a ventilation path 109, and a casing suction port 111 that covers the lower surface of the blades 107 and has a central portion. And the orifice plate 112 provided. On the other hand, in the discharge port 104 of the ventilation fan body 105,
An adapter 113 is provided, and a duct 115 communicating with an outdoor (not shown) side is connected to the adapter 113.

In the above configuration, air contaminated by tobacco smoke (not shown) or the like generated in the room 114 is energized to the electric motor 108 and the blade 107 is rotated to be sucked from the suction port 103 to be blown. The air was discharged from the discharge port 104 to the outside of the room after passing through the ventilation path 109 of 106.

[0004]

In such a conventional duct ventilation fan, since the ventilation casing 110 and the orifice plate 112 constituting the outer shell of the blower 106 are all made of a steel plate, the indoor 114 side becomes dirty. When air is discharged to the outside of the room, blades 107 generated from blower 106
Noise such as wind noise of the wind and electric noise of the electric motor 108
06 and the ventilation casing 110 and the orifice plate 112 resonate to increase the noise of the blower 106, and the noise is directly transmitted from the suction port 103 to the indoor 11.
There was a problem of propagation to the four sides.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to prevent the noise generated from a blower from reverberating or increasing and to prevent the noise from directly transmitting to the indoor side. It is intended to provide.

[0006]

A first means for achieving the above object of the present invention is a box body which is inserted and installed in an opening on a ceiling surface and has a suction port on a lower surface and a discharge port on one side. Jo of the ventilating fan body, disposed inside the ventilating fan body, and an electric motor and a blower comprising a ventilation casing which covers the blade and the blade driven by the motor, the ventilation casing, axially of the vane The air layer formed between the laminated plates arranged in a direction intersecting with the
This is a configuration of a duct ventilation fan formed by laminating a plurality of stages in the axial direction .

A second means for achieving the above object is a duct ventilation fan in which the width of each of the air layers in a plurality of stages is changed at a substantially constant rate.

A third means for achieving the above object is a duct ventilation fan in which an air space is divided into a number of spaces by a partition plate.

A fourth means for achieving the above object is to partition an air space into a number of spaces by a partition plate.
This space is arranged almost radially with respect to the axial direction of the blade.
It has a duct ventilation fan configuration.

A fifth means for achieving the above object is a ventilation fan for a duct provided with a porous thin film having a plurality of holes having dimensions smaller than the width of the air layer on the inner peripheral surface of the ventilation casing. Configuration.

[0011]

According to the first aspect of the present invention, the noise such as the wind noise of the blades and the electric noise of the electric motor generated from the blower enters the air layer formed by the laminated plates of the ventilation casing. Is reduced within.

According to the configuration of the second means, a plurality of air layers having a plurality of widths varying at a constant rate are formed, so that the noise generated by the blower includes not only a specific frequency but also a plurality of frequencies. The noise will be attenuated.

Further, according to the configuration of the third means, the air layer is divided into a number of spaces by the partition plate, and the noise entering the space is frequently reflected and absorbed, thereby improving the noise attenuation effect. Can be done.

[0014] Further, according to the fourth means, the space formed by the partition plate is arranged substantially radially with respect to the axial direction of the blade, so that the wind noise of the blade can be efficiently reduced inside the space. Will be invited.

Further, according to the fifth means, since the porous thin film having a plurality of holes smaller than the width of the air layer is provided on the inner peripheral surface of the ventilation casing, it is possible to enter the space. The noise is surely attenuated without leaking out of the space again.

[0016]

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 box-shaped ventilation fan main body 5 which is installed in an opening 2 of a ceiling surface 1 and has a suction port 3 on a lower surface and a discharge port 4 on one side surface is described later. A blower 6 is provided. The blower 6 includes a motor 8 to which the blades 7 are fixed, a ventilation casing 10 that covers the outer periphery of the blades 7 and forms a ventilation path 9 connecting the suction port 3 and the discharge port 4,
And a casing suction port 1 at the center
And an orifice plate 12 having the same. And the ventilation casing 10 is arranged in the axial direction of the blade 7.
Between the laminated plates 14 arranged in the crossing direction
Is formed in a plurality of stages in the axial direction of the blade 7.
It is formed by lamination. Also, each air layer 13 is constant
Are formed in widths a, b, c, d, and e, which change at a rate of
You. On the other hand, an outlet 15 of the ventilation fan main body 5 is provided with an adapter 15 to which a duct 16 communicating with an outdoor (not shown) side is connected.

With the above configuration, most of the noise such as the wind noise of the blades 7 and the electric noise of the electric motor 8 generated from the blower 6 does not reverberate or increase inside the blower 6, and much of the noise enters the air layer 13. It will be sounded.

The noise entering the air layer 13 has a width a, b, c, d, and e of the air layer 13 that changes at a constant rate. The noise at a plurality of frequencies is attenuated by the air layer, and a large noise reduction effect is exhibited as a whole.

As described above, according to the duct ventilation fan of the first embodiment of the present invention, it is possible to prevent the noise generated from the blower 6 from propagating directly to the indoor side. Also, a great effect can be obtained in noise reduction.

Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in the drawing, this embodiment is different from the first embodiment in that one air layer 13 of the ventilation casing 10A is further divided by a corrugated partition plate 17 into a plurality of spaces 18.
The feature is that it is divided into

With the above configuration, the noise such as the wind noise of the blades 7 and the electric noise of the electric motor 8 generated from the blower 6 does not reverberate or increase inside the blower 6, and most of the noises are formed by a large number of space portions 18. And noise is reduced in the space 18, but since the noise is subdivided by the partition plate 17, the noise that has entered the space 18 is repeatedly reflected and sound-absorbed, and the sound reduction effect is high. It will be.

As described above, according to the duct ventilation fan of the second embodiment of the present invention, the ventilation casing 1 having a higher soundproofing effect.
0A.

Next, a third embodiment of the present invention will be described with reference to FIG. The same components as those in the second embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in the drawing, this embodiment is different from the second embodiment in that a space 18A divided by a partition plate 17A is provided.
Are arranged substantially radially with respect to the axial direction of the blade 7.

With the above-described configuration, noise such as wind noise of the blades 7 generated from the blower 6 and electric noise of the electric motor 8 does not reverberate or increase inside the blower 6, and most of the noises are formed in a large number of space portions 18 A. And the sound is reduced.
Are arranged almost radially with respect to the axial direction of the blade 7, so that the inner end surface of the space 18 </ b> A is almost evenly opened in the direction of the wind noise generated from the outer periphery of the blade 7. Therefore, the generated noise efficiently enters the space 18A, and the noise reduction effect can be enhanced.

As described above, according to the duct ventilation fan of the third embodiment of the present invention, the soundproof effect of the ventilation casing 10B is
The volume can be increased without increasing the volume.

In the second and third embodiments, the partition plates 17 and 17A are formed in a corrugated form. However, the partition plates 17 and 17A may have other shapes as long as they partition the air layer 13 into a plurality of spaces. , Does not cause a difference in the operation effect.

Next, a fourth embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in the drawing, this embodiment is different from the first embodiment in that an air layer 13 is provided on the inner peripheral surface of the ventilation casing 10C.
Is characterized in that a porous thin film 20 having a plurality of holes 19 having a diameter smaller than the width dimension is provided.

With the above structure, noise such as the wind noise of the blades 7 and the electric noise of the electric motor 8 generated from the blower 6 does not reverberate or increase inside the blower 6, and most of the noises are formed in the plurality of holes of the thin film 20. The noise enters the air layer 13 from the air layer 13 and is reduced in sound. However, since the diameter of the plurality of holes 19 of the thin film 20 is formed to be smaller than the width of the air layer 13, the noise entering the air layer 13 is again reduced to the air. Reflection inside the air layer 13 without leaking to the outside of the layer 13, that is, to the blade 7 side,
By repeating the sound absorption, the sound is reliably attenuated, and the sound reduction effect is high. Further, the inner wall surface of the ventilation casing 10C, that is, the surface of the ventilation passage 9 is formed more smoothly by the plurality of holes 19, so that the ventilation resistance of the ventilation passage 9 can be reduced.

As described above, according to the duct ventilation fan of the fourth embodiment of the present invention, the ventilation casing 10A having a higher soundproofing effect and a lower ventilation resistance is provided.

[0034]

As is clear from the above embodiments, according to the present invention, the noise generated from the blower is reduced by the ventilation casing.
For ducts that have the effect of being attenuated by entering the air layer formed by the laminated board , preventing them from reverberating or increasing inside the blower, and preventing noise from directly propagating indoors A ventilation fan can be provided.

Also, a plurality of widths of the sky varying at a fixed rate
By forming the air layer, noise of a plurality of frequencies can be easily reduced without increasing the volume of the ventilation casing, and the soundproof effect of the ventilation casing generated by the blower can be further enhanced.

Similarly, by dividing the air layer for attenuating noise into a large number of spaces without increasing the volume of the ventilation casing, the attenuating ability can be enhanced and the soundproofing effect can be further enhanced.

Similarly, without increasing the volume of the ventilation casing, the space formed by the partition plate can be
Almost radially with respect to the axial direction of the root
Thus, wind noise generated from the outer periphery of the blade can be efficiently induced to the space of the ventilation casing, and the soundproof effect can be further enhanced.

Further , an air layer is formed on the inner peripheral surface of the ventilation casing.
Porous thin with multiple holes smaller than width
By providing the membrane without leaking noise entering the air layer out again from the air layer, and the sound reduction in the inner air layer, it is possible to enhance the soundproofing effect more surely, the ventilation casing air passage The ventilation resistance can be further reduced, and the ventilation efficiency of the duct ventilation fan can be improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an installation state of a duct ventilation fan according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the ventilation fan for the duct.

FIG. 3 is a perspective view showing a ventilation casing of the duct ventilation fan according to the second embodiment.

FIG. 4 is a perspective view showing a ventilation casing of the duct ventilation fan according to the third embodiment.

FIG. 5 is a perspective view showing a ventilation casing of the duct ventilation fan according to the fourth embodiment.

FIG. 6 is a side sectional view showing an installation state of a conventional duct ventilation fan.

FIG. 7 is an exploded perspective view of the ventilation fan for the duct.

[Description of Signs] 1 ceiling surface 2 opening 3 suction port 4 discharge port 5 ventilation fan main body 6 blower 7 blade 8 motor 10 ventilation casing 10A ventilation casing 10B ventilation casing 10C ventilation casing 13 air layer 14 laminated plate 17 partition plate 17A partition plate 18 space part 18A space part 19 hole 20 thin film

Claims (5)

(57) [Claims] 1. A box-shaped ventilation fan main body which is inserted and installed in an opening of a ceiling surface, has a suction port on a lower surface, and a discharge port on one side, and is disposed inside the ventilation fan main body, and comprises an electric motor and the electric motor. and a blower comprising a driven vane and ventilation casing which covers the blade, the ventilation casing, disposed in a direction crossing the axial direction of the vane
The air layer formed between the laminated plates in the axial direction of the blade
Ventilation fan for ducts formed by stacking multiple stages . 2. A multi-stage approximately claim 1 ventilators duct according which is changed at a predetermined rate the width of each air layer. 3. The ventilation fan for a duct according to claim 1, wherein the air layer is divided into a number of spaces by a partition plate. 4. An air layer is divided into a large number of spaces by a partition plate.
Cut, according to claim 1 or 2 duct ventilators according disposed substantially radially with respect to the axial direction of the blades the space. 5. The ventilation fan according to claim 1, wherein the ventilation casing has a porous thin film having a plurality of holes having dimensions smaller than the width of the air layer on an inner peripheral surface of the ventilation casing.