JPH05126097A - Silencer for air blower - Google Patents

Abstract

PURPOSE:To provide an air blower with a silencer reducing increase in air-flow resistance and noise generated from the air blower. CONSTITUTION:There is provided an air blower 6 having ventilating casings 5 with a fan suction port 4 facing to two main suction ports 3 in a main body 1 having the main suction ports 3 on its one face. An inside ventilating channel 10 having a ventilating area larger than that of the fan suction port 4 is provided between the fan suction port 4 in the main body 1 and the main suction ports 3. Sound insulating units 9 forming a plurality of air layers 14 in the direction crossing with the rotating axis 13 direction of the air blower 6 from the inside ventilating channel 10 are provided. Less air-flow resistance exists even if air passes through the sound insulating units 9. Therefore, noise admitted into a plurality of the air layers vigorously repeats reflection and sound adsorption without inviting a decrease in ventilation efficiency, reducing noise with good efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is applied to various blowers used for industrial and air conditioning in factories, buildings, warehouses, etc., and axial blowers used for ventilation in tunnels, etc., or various devices used for general households. Also relates to a silencer used.

[0002]

2. Description of the Related Art In recent years, it has been important to create a comfortable indoor / outdoor environment for various devices having a built-in blower. Therefore, it has been desired to reduce the noise generated from the device itself as much as possible. .

For this reason, a conventional device having a built-in blower is constructed as shown in, for example, Japanese Unexamined Patent Publication No. 1-006596.

The schematic structure will be described below with reference to FIG. That is, in a tubular double tube formed of an inner cylinder 101 made of a perforated plate such as punching metal and an outer cover plate 102, a sound absorbing material 103 such as glass wool is placed between the inner cylinder 101 and the outer cover plate 102 in the thickness direction. It is cut into strips of the same width, and one of the cut surfaces of the sound absorbing material 103 is the inner cylinder 10.
A sound deadening device having a sound absorbing material 103, which is arranged in contact with 1 and the other is in contact with the exterior plate 102 and whose entire surface is cross-bonded, is connected to a suction port or a discharge port of a blower 104.

In the above structure, the noise generated by the blower 104 is absorbed by the sound absorbing material 103 and its propagation to the surroundings is attenuated.

[0006]

In such a conventional silencer for a blower, noise is absorbed by the sound absorbing material 103 sandwiched between the perforated plates. Therefore, in order to enhance the sound absorbing effect, the sound absorbing material 103 is used. It is necessary to considerably increase the volume, and as a result, the exterior plate 102 becomes large, the outer shape becomes thick, and the weight becomes heavy, which poses a problem in terms of mounting and manufacturing.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a muffler for a blower that is easy to manufacture and has a small weight increase even if the noise generated from the blower is reduced.

A second object is to enhance the soundproof effect in order to increase the effect of reducing the noise generated from the blower.

[0009]

A first means for achieving the first object of the present invention is to provide a main body having a main body suction port with one surface opened, and a fan suction port facing the main body suction port. A blower having a provided ventilation casing is built-in, and an inner ventilation passage having a ventilation area larger than the fan suction opening is provided in a space between the fan suction opening and the main body suction opening, and the blower of the blower is provided from this inner ventilation passage. This is a structure of a muffler for a blower in which a cylindrical soundproof unit made of laminated plates forming a plurality of air layers is arranged in a direction intersecting with the rotation axis direction.

The second means for achieving the first object is to arrange the soundproof unit so that a space is formed between the outer peripheral portion and the inner side surface of the main body, and to arrange the air layer of the soundproof unit. The structure is such that the inner ventilation passage and the space are communicated with each other.

A third means for achieving the second object is a structure in which the widths of a plurality of air layers are changed at a substantially constant rate.

A fourth means for achieving the second object is a structure in which the air layer is divided into a large number of spaces by partition plates.

The fifth means for achieving the second object is such that the space formed by the partition plate is arranged substantially radially from the inner ventilation passage.

A sixth means for achieving the second object is that at least a part of the soundproof unit is made of a sound absorbing material.

A seventh means for achieving the second object is that at least a part of the laminated plate is made of a sound insulating material.

[0016]

According to the present invention, with the structure of the first means described above, the soundproof unit disposed in the space between the main body suction port and the fan suction port is provided with the inner ventilation passage having a larger ventilation area than the fan suction port. Since the air sucked from the fan suction port by the blower can pass through this inner ventilation path, the ventilation resistance is extremely small, and the noise generated by the blower is emitted from the fan suction port in all directions. Many enter the air layer formed by the laminate and are damped in the air layer.

Further, according to the structure of the second means, since the outer air passage on the outer peripheral side and the inner air passage on the inner peripheral side of the soundproof unit communicate with each other through the air layer, the blower sucks the air from the fan suction port. Since the generated air is also attracted to the inner ventilation passage from the outer ventilation passage through the air layer, the ventilation resistance can be further reduced.

Further, by the structure of the third means, air layers having a plurality of widths that change at a constant rate are formed, and not only the noise generated by the blower of a specific frequency but also a plurality of frequencies. The noise will be attenuated.

Further, according to the structure of the fourth means, the air layer is partitioned into a large number of space portions by the partition plate, and the noise that has entered the space portions is frequently reflected and absorbed, whereby a noise damping effect is obtained. Can be improved.

Further, according to the structure of the fifth means, since the space formed by the partition plate is arranged substantially radially outward from the inner ventilation passage, it is discharged from the fan suction port in all directions. The noise generated by the blower is effectively attracted to the space.

Further, according to the structure of the sixth means, the soundproof unit, at least a part of which is made of the sound absorbing material, effectively attenuates the noise entering the air layer.

Further, according to the structure of the seventh means, the soundproof unit in which at least a part of the laminated plate is made of a sound insulating material prevents noise entering the air layer from leaking to the inside of the room, effectively reducing the noise. Let

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG.

As shown in the drawing, the main body 1 of the blower has a built-in blower 6 having a ventilation casing 5 provided with a fan suction port 4 facing a main body suction port 3 opened downward, and is provided on one side surface. A discharge port 7 is formed, and the discharge port 7 is communicated with the outside through a duct 8. In the space between the fan suction port 4 and the main body suction port 3 in the main body 1, there is an inner ventilation path 10 having a ventilation area larger than that of the fan suction port 4.
A width 14a that changes at a constant rate in a direction intersecting the direction of the rotation axis 13 of the blower 6 from the inner ventilation passage 10;
A soundproof unit 9 including a laminated plate 15 forming a plurality of air layers 14 of 14b, 14c, 14d, and 14e is provided. Further, the soundproof unit is arranged so that a space is formed between the outer peripheral portion thereof and the inner side surface 11 of the main body 1,
This space communicates with the inner ventilation passage 10 through the air layer 14 to form an outer ventilation passage 12.

Reference numeral 16 in the figure is a protection network. With the above configuration, the noise generated by the blower 6 is emitted from the fan suction port 4 in all directions, but most of the noise enters the air layer 14 and is reduced in noise. At the same time, blower 6
The air in the room sucked from the fan suction port 4 by
Since it passes through the inner ventilation passage 10 having a ventilation area larger than that of the fan suction port 4 provided in the soundproofing unit 9, the ventilation resistance becomes extremely small.

Further, the air in the room sucked from the fan suction port 4 is the inner ventilation passage 10 provided in the soundproof unit 9.
In addition, since the air is drawn from the outer ventilation passage 12 to the inner ventilation passage 10 through the air layer 14, the ventilation resistance is further reduced.

Further, the noise entering the air layer 14 has a width 14a, 14b, 14c, 14d, 14e of the air layer 14 which changes at a constant rate, so that the noise having a width corresponding to a frequency with a high noise reduction effect is generated. Noise in 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 first embodiment, the blower 6
Even if the noise generated by the soundproofing unit is reduced by the soundproof unit, the ventilation resistance is extremely small, so that the reduction in ventilation efficiency can be eliminated. In addition, noise reduction can also be greatly effective.

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

The present embodiment is characterized in that one air layer 14 is further divided into a number of spaces by a corrugated partition plate 17.

With the above structure, the noise generated by the blower 6 is emitted from the fan suction port 4 in all directions, and most of it enters the large number of space portions 18 and the space portions 18
The sound is reduced inside, but since it is subdivided by the partition plate 17,
The noise that has entered the space 18 is highly reflected and absorbed, and the sound reduction effect is enhanced.

As described above, according to the muffler of the blower of the second embodiment of the present invention, the sound deadening unit having a higher sound deadening effect is provided.

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

In the present embodiment, as shown in the figure, in contrast to the first and second embodiments, the space portion 28 partitioned by the partition plate 17 is arranged substantially radially outward from the inner ventilation passage 10. There are features.

With the above structure, the noise generated by the blower 6 is emitted from the fan suction port 4 in all directions, and most of the noise enters the space portion 28 and is reduced in noise. Since the inner end surfaces of the space portions 28 are arranged substantially radially from the outer side of the fan 10, most of the inner end surfaces of the space portion 28 are opened substantially evenly with respect to the direction of the noise emitted from the fan suction port 4, so that it is efficient. The generated noise enters the cylindrical space 18a, and the noise reduction effect can be enhanced.

As described above, according to the muffler of the blower of the third embodiment of the present invention, the soundproof effect of the soundproof unit 9 can be further enhanced without increasing its volume.

In the second and third embodiments, the partition plate 17 is formed into a corrugated shape. However, even if the partition plate 17 has another shape, it will work as long as it divides the air layer 14 into a large number of spaces. There is no difference in effect.

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

As shown in the figure, a part of the laminated plate 15 which is a component of the soundproof unit 9 is formed by the sound absorbing material 19, and another part of the laminated plate 15 is formed by the sound insulating material 20. ing.

With the above structure, the noise generated by the blower 6 entering the air layer 14 is more absorbed by the sound absorbing material 19, and the soundproof effect of the soundproof unit 9 can be enhanced.

Similarly, the blower 6 entering the air layer 14
Since the noise generated by the sound is blocked by the sound insulating material 20, the noise propagating inside the room can be further attenuated.

As described above, according to the muffler of the blower of the fourth embodiment of the present invention, the soundproof effect of the soundproof unit 9 can be further enhanced without increasing the volume.

In the embodiment, the sound absorbing material 19 and the sound insulating material 2 are used.
Although 0 is alternately laminated, even if all the components constituting the soundproofing unit 9 are made of sound absorbing material or the laminated plate 15 is made of sound insulating material, there is a slight difference in soundproofing. There is no difference in the basic operation effect in terms of enhancing the soundproof effect of the unit 9.

In the first to fourth embodiments described above, the present invention is applied to the blower with the suction port facing downward. However, the invention is implemented in any other direction (for example, upward or horizontal direction). It is needless to say that the same effect can be obtained by applying it to the blower installed in, or to the air outlet.

Further, although the type of the blower is shown as a centrifugal type, the same applies to an axial flow type or a through flow type (so-called cross flow fan etc.). However, in the case of a cross flow fan, it is necessary to make the outer shape of the soundproofing unit and the shape of the inner ventilation path rectangular.

[0046]

As is apparent from the above embodiments, according to the present invention, a soundproof unit for reducing the noise generated by the blower is provided in the space between the fan suction port and the main body suction port. Even so, it is possible to provide a muffler for a blower that does not impair the sound reduction effect of the soundproof unit, prevents an increase in ventilation resistance, has good ventilation efficiency, and enables low-noise operation.

Further, the ventilation efficiency can be further enhanced by further reducing the increase in ventilation resistance caused by disposing the soundproof unit without impairing the sound reduction effect of the soundproof unit.

Further, by facilitating noise reduction of a plurality of frequencies without increasing the volume of the soundproof unit, it becomes possible to further enhance the soundproof effect of the noise generated by the blower by the soundproof unit.

Similarly, by partitioning the air layer for attenuating noise into a number of spaces without increasing the volume of the soundproofing unit, the damping capacity can be enhanced and the soundproofing effect can be further enhanced.

Further, similarly, without increasing the volume of the soundproofing unit, the noise generated by the blower discharged from the fan suction port in all directions can be effectively attracted to the space of the soundproofing unit to further improve the soundproofing effect. Can be increased.

Similarly, without increasing the volume of the soundproofing unit, by using the sound absorbing material for the soundproofing unit parts such as the laminated plate forming the air layer having the sound reducing effect, the sound absorbing effect is enhanced and further reduced. The sound effect can be enhanced.

Similarly, without increasing the volume of the soundproofing unit, the laminated plate forming the air layer having a sound reducing effect is made of a sound insulating material, so that the noise entering the air layer is leaked to the indoor side. By not doing so, a soundproof unit having a high soundproofing effect can be obtained.

[Brief description of drawings]

FIG. 1 is a mounting cross-sectional view of a silencer for a blower according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a soundproofing unit according to the second embodiment.

FIG. 3 is a perspective view of a soundproofing unit according to the third embodiment.

FIG. 4 is a mounting cross-sectional view of a muffler for a blower according to the fourth embodiment.

FIG. 5 is a mounting cross-sectional view of a conventional silencer for a blower.

[Explanation of symbols]

 1 Main Body 3 Main Body Suction Port 4 Fan Suction Port 5 Ventilation Casing 6 Blower 9 Soundproofing Unit 10 Inner Ventilation Channel 11 Inner Side 12 Outer Ventilation Channel 13 Rotating Axis 14 Air Layer 14a Width 14b Width 14c Width 14d Width 14e Width 15 Partition Plate 17 Board 18 Space portion 19 Sound absorbing material 20 Sound insulation material 28 Space portion

Claims (7)

[Claims] 1. A blower having a ventilation casing provided with a fan suction port facing the main body suction port is built in a main body having a main body suction port opened on one side, and the fan suction port and the main body suction port are connected to each other. A tube made of a laminated plate having an inner ventilation passage having a ventilation area larger than the fan suction port in the space between them and forming a plurality of air layers in a direction intersecting with the rotation axis direction of the blower from the inner ventilation passage. Fan silencer with a soundproof unit. 2. The soundproof unit is arranged so that a space is formed between the outer peripheral portion of the soundproof unit and the inner surface of the main body, and an air layer of the soundproof unit is communicated with the inner ventilation passage and the space. Blower silencer. 3. The silencer for a blower according to claim 1, wherein the widths of the plurality of air layers are changed at a substantially constant rate. 4. The silencer for a blower according to claim 1, wherein the air layer is divided into a number of spaces by partition plates. 5. The space formed by the partition plate is arranged substantially radially outward from the inner ventilation passage.
The muffler of the blower according to 2, 3 or 4. 6. The silencer for a blower according to claim 1, 2, 3, 4 or 5, wherein at least a part of the soundproof unit is made of a sound absorbing material. 7. The silencer for a blower according to claim 1, 2, 3, 4 or 5, wherein at least a part of the laminated plate is made of a sound insulating material.