JPH09291900A - Assembly type silencer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute assembly or disassembly work easily and economically by the use of a light noise eliminating panel having high noise insulating performance even in a low frequency area, by surrounding the circumference of a blower with the noise eliminating panel in which a plurality of sound absorbing materials are polymerized. SOLUTION: A noise eliminating panel 5 in which a plurality of sound absorbing materials are polymerized, is arranged to be suspended from the lower surface of a ceiling slab 20 so as to surround the circumference of an axial flow fan 4 while taking in consideration balance between a column 2a and a beam 2b in the ceiling. This noise eliminating panel 5 is so formed that glass wool is arranged on both sides of a two-layer gypsum plaster board arranged in a central cross section, zinc steel plates are arranged on both sides of this glass wool, and many small holes are formed on a side composing the inner wall of a silencer 1. Hereby, in a job site or in a factory, this silencer 1 can be manufactured easily and economically in a desired shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly-type muffler used to muffle a large blower (axial fan) for exhausting air conditioning equipment installed in a building.

[0002]

2. Description of the Related Art Conventionally, a method of silencing an exhaust axial fan connected to a duct has generally been to install a temporary shed at a predetermined position inside or outside a building and install the axial fan inside the hut. It is housed in the hut, and sound absorbing material such as glass wool, felt, and sound absorbing board is attached to the inner wall of the hut for noise reduction.

Further, in order to muffle noise particularly in a low frequency range, lightweight cellular concrete (AL
C) A sound absorbing material such as a plate is lined. Further, other than this, there is also a method in which a blower is housed in the machine room and connected to each room through a duct.

[0004]

However, in the conventional method for silencing the axial blower as described above, in particular,
In order to block the noise in the low frequency region, the sound absorbing material installed around the blower becomes heavy, and therefore the equipment becomes large in scale, the construction efficiency deteriorates, and a sufficient installation space must be secured. There was a problem that it had to be.

Further, the distance between the axial blower and the air conditioner on the upper side of the living room becomes long, and the duct connecting them becomes long, resulting in a problem of low energy efficiency.

Therefore, the present invention has been made by paying attention to the above-mentioned unsolved problems of the prior art, and it is simple and economical to use a lightweight silencing panel having a high sound insulation performance even in a low frequency region. It is an object of the present invention to provide an assembly-type muffler that can be assembled or disassembled.

[0007]

In order to solve the above problems, the present invention relates to a silencer for silencing noise generated from a blower of an air conditioner installed in a building, (EN) Provided is an assembled silencer, which is characterized in that a blower is surrounded by a silencer panel in which a plurality of sound absorbing materials are superposed.

Thus, according to the individual shape of the blower for air conditioning installed inside the assembled silencer, the surroundings of the equipment are appropriately surrounded by the silencer panel so that the inside of the ceiling is narrow. The space can be effectively used for installation, and the assembled silencer can be easily disassembled even when repairing or inspecting internal equipment.

By constructing a sound deadening panel by superimposing a plurality of different sound absorbing materials, for example, a sound absorbing material such as a sound absorbing plaster having sufficient sound insulation in a low frequency range, It is composed of different cotton-like sound-absorbing materials such as glass wool and felt that have high sound insulation in the middle and high frequency range, and noise such as wind noise generated from the blower installed inside the assembly type silencer from low frequency to high frequency. Cut off in a wide range up to the band.

The sound deadening panel is placed on the gypsum board arranged in the center of the cross section, glass wool placed on both sides of the gypsum board, and on both sides of the glass wool, on the side forming the inner wall of the assembly type silencer. In the case of a zinc iron plate with a large number of holes, a sound deadening panel with the optimum sound insulation performance of a blower is realized, and a low-frequency area noise is blocked by a lightweight plaster board made of sound absorbing plaster in the center of the cross section. , The cotton wool on both sides of the glass block the noise in the middle and high frequency range, and the zinc-iron plates on both sides protect the gypsum board, which has a relatively low strength, to improve the rigidity of the sound deadening panel.

Further, by forming an uneven portion on the joint surface of the sound deadening panel and by assembling the uneven portion with each other, the sound deadening panel is assembled. The above embodiment is embodied, and each joint surface has a labyrinth shape, so that noise is reflected on the joint surface and leakage to the outside of the device is prevented.

Further, by assembling the silencer panel in a box shape and surrounding the blower, a silencer panel made of one kind of flat plate is formed in a predetermined size and each silencer panel is appropriately joined. As a panel structure to be assembled by assembling, the manufacturing period of the assembly type sound deadening panel is shortened and the quality is stabilized.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the assembled silencer of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes an assembly-type silencer (hereinafter, abbreviated as silencer), which is generated from an exhaust axial fan 4 in an air conditioner 3 arranged inside a ceiling 2 above a living room. It is for muffling wind noise and other noise.

In this sound deadening device 1, a sound deadening panel 5 in which a plurality of sound absorbing materials are superposed surrounds the circumference of the axial flow fan 4 in consideration of the connection with the pillars 2a and the beams 2b in the ceiling or in the field. Pre-assembled in a box at the factory,
It is installed in a state of being suspended from the lower surface of the ceiling slab 20.

As shown in FIG. 2, the muffling panel 5 is
Here, two layers of gypsum board 6 having a thickness of 12 mm arranged in the center of the cross section, glass wool 7 having a density of 24 kg / m ³ and a thickness of 35 mm, which are arranged on both sides of the gypsum board 6, and the glass wool 7, a 1.6 mm zinc iron plate 8a arranged on the side forming the outer wall of the muffler 1 and a number on the side forming the inner wall of the muffler 1, in order to suppress reflection of noise inside the muffler 1. Thickness 0.8 with small holes
mm zinc iron plate 8b.

Further, as shown in FIG. 3 (a), the joint structure of the sound deadening panel 5 has a joint portion structure in which the upper sound deadening panel 5 is adhered to the ceiling slab 20 and each sound deadening panel is bonded. In the joint surface of the panel 5, the plaster board 6 of the two layers in the center is projected or depressed, and the periphery thereof is a zinc-iron plate 8
It is covered with a, and these concavo-convex portions 10 are fitted to each other and the packing 9 made of rubber sponge is interposed on the joint surface so that they are in close contact with each other without a gap.

Further, the structure of the joint portion of the sound deadening panel 5 as shown in FIG. 3 (b) is such that the gypsum board 6 of the sound deadening panel 5 whose end surface is a joining surface among the sound deadening panels 5 to be joined is depressed. In addition, the concave portion is formed by covering the periphery thereof with the zinc iron plate 8, and the convex portion is further formed on the side surface of the mating panel 5 on the other side, and the concave and convex portions 10 are fitted to each other to interpose the packing 9. , They are closely attached without any gaps.

On the other hand, as shown in FIG.
Here, the interior is partitioned into three silencing chambers 12 by a partition panel 11, and each partition panel 11 is provided with a communication port 13.

Here, an axial flow fan 4 is arranged in the central silencing chamber 12, one end of a flexible expansion joint 14 is connected to both ends of the air supply side and the exhaust side thereof, and the other end is a panel for partitioning. It is attached to the communication port 13 of 11.

A tubular sound-absorbing duct 16 is arranged inside the central sound-absorbing chamber 12 on the air supply side, and a cotton-like sound-absorbing material such as glass wool or felt is provided in the surrounding space. 17 are packed.

Further, a duct 18 is connected to the opening of the muffler chamber 12 on the air supply side, and the duct 18 is a T-tube, and one of the ducts 18 bifurcating is attached to the ceiling of each room. It is connected to an air supply port (not shown) provided, and the other is connected to a suction port 19 in the ceiling via a sound absorbing duct.

In order to verify the sound insulation performance of the muffler 1 thus constructed, the axial fan 4 inside the muffler 1 is operated to generate noise, and this noise is generated by the axial fan inside the muffler 1. Microphones were installed in the vicinity of 4 and above and on both sides of the muffler 1 outside the muffler 1, and the sound insulation for each frequency was measured and evaluated by comparing with the sound insulation planned at the design stage. Are shown in Table 1 below.

[0023]

[Table 1] As a result, sufficient sound insulation at the planning stage was ensured, and as shown in FIG. 4, it was possible to achieve an NC equivalent value of 40 or less in all frequency bands for the indoor noise. In addition, especially in the low frequency region (6
Suitable results were obtained in sound transmission loss at 3 Hz and 125 Hz).

As described above, since the lightweight muffling panel 5 can ensure sufficient sound insulation performance for a wide range of noises from the low frequency band to the high frequency band, a narrow space such as the ceiling near the living room can be effectively used. It can be installed easily and economically.

Also, when inspecting the axial fan 4 inside the silencer 11, it can be easily disassembled and the maintainability can be improved. It should be noted that in the above-described embodiment, 1 formed on the joint surface of each muffling panel 5
The two concavo-convex surfaces are fitted to each other to join them, but the invention is not necessarily limited to this, and the plural concavo-convex portions can be fitted to each other to improve the sealing performance.

In addition, as shown in FIG. 5 (a), the other joining structure of the muffling panel 5 is such that the insert 21 is embedded in the ceiling slab at the position where the muffling device 1 is to be installed in advance and installed at that position. The basic bolt 22 is penetrated from the recess formed at the lower end of the sound deadening panel 5 to be screwed into the inside of the insert, and the long nut 24 is halved to the base bolt 22 protruding from the recess 23 at the lower end of the sound deadening panel 5. The sound deadening panel 5 is fixed to the ceiling slab 20 by screwing to some extent.

Similarly, the sound deadening panel 5 connected to the sound deadening panel 5 also penetrates the base bolt 22 at the center of the cross section and has the base bolt 22 projecting from the upper end thereof.
4, the long nut 24 is screwed into the base bolt 22 projecting from the recess 23 at the lower end of the muffling panel 5, and fixed by tightening.

Further, when connecting the muffling panel 5 from the lower end of the muffling panel 5 in the lateral direction, the side face which is the contact surface with the muffling panel 5 is penetrated by the base bolt 22 to form a recess at the lower end of the muffling panel 5. It is also possible to screw the base bolt 22 inside the long nut 24 attached to the screw 23, and fix the base bolt 22 protruding from the lower end of the muffling panel 5 with the nut 25.

Further, in the above embodiment, the insert 21 is embedded inside the ceiling slab 20, and the foundation bolt 22 is screwed into the inside of the insert 21, thereby
Although the silencer 1 and the ceiling slab 20 are fixed to each other, as shown in FIG. 5B, a through hole 26 is provided in the ceiling slab 20 on both upper sides of the position where the silencer panel 5 is arranged. Is installed to penetrate the foundation bolt 22, and the ceiling slab 2
The upper and lower ends of the foundation bolt 22 protruding from
The foundation bolts 22 protruding from the lower surface of the ceiling slab 20 can be fixed by the nuts 25 via the mounting brackets 27 made of angle steel attached to both sides of the sound deadening panel 5.

Further, the method of joining the sound deadening panels 5 of the sound deadening device 1 is not limited to the above-described embodiment, and zinc iron plates can be welded together. It should be noted that the material forming the sound deadening panel 5 in the above embodiment is not necessarily limited to this, and instead of the gypsum board 6, for example,
It may be made of a porous sound absorbing material such as a sound absorbing plaster.

Further, instead of glass wool, cotton, such as felt, soft fiberboard and cloth may be used. further,
Instead of the zinc-iron plate, various steel plates such as stainless steel and aluminum can be used.

Furthermore, in the above embodiment, the case where the muffler 1 is applied to an axial fan for air conditioning has been described, but the present invention is not limited to this, and it can be applied to all kinds of noise generating devices. Of course, you can

[0033]

As described above, the assembled muffler of the present invention has a structure in which a blower is surrounded by a muffler panel in which a plurality of sound absorbing materials are superposed, so that the muffler can be installed at a desired location or in a factory. The shape can be manufactured easily and economically, a small space such as the ceiling of a building can be effectively used, and the maintainability such as repair and inspection of internal equipment can be improved.

As described in claim 2, the sound deadening panel comprises two layers of gypsum board arranged in the center of the cross section, and glass wool arranged on both sides of the gypsum board.
By arranging on both sides of the glass wool and consisting of a zinc iron plate with a large number of holes on one side, it is possible to reduce the weight of the entire device and also to sufficiently insulate the living space below the ceiling. Can be secured.

Further, as described in claim 3, by forming an uneven portion on the joint surface of the sound deadening panel and assembling the uneven portions by fitting them together, noise is reflected on the joint surface and is transmitted to the outside of the device. Leakage is prevented.

Further, as described in claim 4, by assembling the sound deadening panel into a box shape and surrounding the blower to form the assembled sound deadening device as a panel structure, the workability is improved and the quality is improved. Stabilization can be achieved.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view showing an assembly-type silencer according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing a sound deadening panel of the assembly-type sound deadening device shown in FIG.

FIG. 3 is a side sectional view showing details of the sound deadening panel joint portion of FIG. 2;

FIG. 4 is a line graph showing the results of a sound insulation test of the assembly-type silencer according to the embodiment of the present invention.

FIG. 5 is a side sectional view showing a modified example of the joint portion of the sound deadening panel of the assembly-type sound deadening device.

[Explanation of symbols] 1 …… Silence reducer 2 …… Ceiling 3 …… Air conditioning equipment 4 …… Axial fan 5 …… Silence panel 6 …… Gypsum board 7 …… Glass wool 8 …… Zinc iron plate 9 …… Packing 10… … Uneven part 11 …… Panel 12 …… Silence room 13 …… Communication port 14 …… Flexible expansion joint 17 …… Sound absorption material 18 …… Duct 19 …… Suction port 20 …… Ceiling slab 22 …… Foundation bolt 27 …… Mounting bracket

Claims (4)

[Claims] 1. A silencer for silencing noise generated from a blower of an air conditioner installed in a building, wherein the blower is surrounded by a silencer panel in which a plurality of sound absorbing materials are polymerized. A built-in silencer characterized by 2. The assembly-type silencer according to claim 1, wherein the silencer panel is a gypsum board arranged in the center of the cross section, and glass wool arranged on both sides of the gypsum board.
An assembling silencer, which is arranged on both sides of the glass wool and comprises a zinc-iron plate having a large number of holes on the side forming the inner wall of the assembling silencer. 3. The assembly-type silencer according to claim 1, wherein an uneven portion is formed on a joint surface of the silencer panel, and the uneven portion is fitted to each other to assemble the silencer panel. Assembled silencer. 4. The assembled silencer according to claim 1, wherein the silencer panel is assembled in a box shape to surround the blower.