JPH06288351A - Soundproof unit - Google Patents

Abstract

PURPOSE:To provide a soundproof unit with good sealing property and high sound insulating effect with a simple work by fitting a lower sound insulating member to an upper sound insulating member to form a double sound insulating wall. CONSTITUTION:A lower sound insulating member 10 has a bottom plate 1 for placing an equipment 30 forming a noise source and a cylindrical first sound insulating wall 12 surrounding the circumference of the equipment 30, which are integrally formed. The first sound insulating wall 12 has a box form in which the upper part is opened in the state vertically stood on the surface of the bottom plate 11. An upper sound insulating member 20 has a top plate 21 for covering the opening part of the first sound insulating member 12 and a cylindrical second sound insulating wall 22 surrounding the circumference of the equipment 30 in the inner circumferential part of the first sound insulating wall 12, which are integrally formed. The second sound insulating wall 22 has a form smaller than the cross sectional form of the first sound insulating wall 12, so that it is situated on the inner circumferential part of the first sound insulating wall 12 when fitted. Thus, the second sound insulating wall 22 also has a box form having an opening in the lower part in the state stood on the top plate 21. Thus, a soundproof unit having high sound insulating effect can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof device, and more particularly to a soundproof unit suitable for soundproofing a compressor or the like in an outdoor unit of an air conditioner (hereinafter referred to as an air conditioner).

[0002]

2. Description of the Related Art The popularity of air conditioners in recent years has become extremely high. On the other hand, in air conditioners, the compressor and accumulator in the outdoor unit generate noise,
Under the housing situation in Japan, it often causes a dispute between neighbors. Therefore, various soundproofing measures have been conventionally proposed. For example, a sound absorbing material or sound insulating material molded in a plate shape or a predetermined plane shape is individually attached to the wall of a compressor or an accumulator or filled in a void, or a sound absorbing material molded in a flat shape. A relatively large number of methods have been adopted in which a material or sound insulating material is cut or bent into a predetermined shape and the ends are sewn together to form a three-dimensional shape, which is then covered with a compressor or an accumulator. However, in these methods, since the number of parts constituting the soundproof cover is large, the work for soundproofing is complicated, and the sealing performance of the soundproof cover is poor, so that a high soundproofing effect cannot be expected.

Therefore, in Japanese Unexamined Patent Publication No. 1-210735, a soundproof material having a three-layer structure of sound absorbing material / sound insulating material / sound absorbing material is formed into a plate shape, and then bent into a tubular shape with one side opened, and an overlapping portion To form a tubular cover that joins
It has been proposed to cover the cylindrical body with a compressor or an accumulator in an outdoor unit of an air conditioner for soundproofing.

[0004]

However, the soundproof cover needs the following improvements. It is very complicated to integrally mold a soundproof material having a three-layer structure of sound absorbing material / sound insulating material / sound absorbing material into a tubular body having one end open. The sealing property of the one end opening side of the cylindrical cover and the part joined by bending is poor, and noise leaks from the gap between the bottom plate of the outdoor unit of the air conditioner. In order to join the overlapping portions when bent into a tubular shape in a state where the soundproof effect is enhanced, it is necessary to remove the sound absorbing material and integrally join the sound insulating materials, which requires a great deal of labor for the joining work.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a soundproofing unit which can be constituted by a simple molding operation and an assembling operation and which has a good sealing property and a high soundproofing effect.

[0006]

In order to achieve the above object, a soundproof unit of the present invention comprises a bottom plate on which a device serving as a noise source is placed, and a cylindrical first soundproof wall surrounding the device. A molded lower soundproof member, a top plate having the same shape as or larger than the opening shape of the first soundproof wall, and a cylindrical soundproof wall surrounding the periphery of the device, which crosses the first soundproof wall. An upper sound deadening member integrally formed with a second sound deadening wall having a cross-sectional shape larger or smaller than the surface shape, and the lower sound deadening member and the upper sound deadening member, wherein the first and second sound deadening walls are double walls. The sound-absorbing material is provided between the soundproof walls and at least one of the innermost soundproof walls, if necessary.

[0007]

In the soundproofing unit having the above-described structure, a device as a noise source is placed (installed) on the bottom plate inside the first soundproof wall of the lower soundproofing member formed by integrally molding the bottom plate and the first soundproof wall, and then, An upper soundproof member formed by integrally molding a top plate and a second soundproof wall is engaged with a portion of the first soundproof wall of the lower soundproof member to cover the entire device. Then, when the noise generated from the device is large, before engaging the upper soundproof member, one of the first soundproof wall and the second soundproof wall, and the inner side of the innermost first or second soundproof wall. Or attach sound absorbing material to both.

[0008]

EXAMPLE An example in which the soundproof unit of the present invention is used for an outdoor unit of an air conditioner will be described below. FIG. 1 is a perspective view of a first embodiment of a soundproofing unit of the present invention in a state in which a main portion is cut off, and FIG. 2 is a sectional view of a main portion before a soundproofing member is fitted. In the figure, 10 is a lower soundproofing member, 20 is an upper soundproofing member, and 30 is a device such as a compressor or an accumulator which is a source of noise. The lower soundproof member 10 includes a bottom plate 11 for mounting (installing) a fan (not shown) that is an outdoor unit of an air conditioner and a device 30 that is a noise source.
A cylindrical first soundproof wall 1 surrounding a device 30 that is a noise source.
2 are integrally formed. The first soundproof wall 12 is integrally formed in a vertically standing state on the one end side surface of the bottom plate 11 in accordance with the mounting position of the device 30 as a noise source.
The first soundproof wall 12 is in the shape of a rectangular box with an open top.

The upper soundproof member 20 includes a top plate 21 that covers the opening of the first soundproof wall 12 and a second cylindrical soundproof that surrounds the inner peripheral portion of the first soundproof wall 12 which serves as a noise source. The wall 22 is integrally formed. Here, in order to prevent sound leakage from the opening of the first soundproof wall 12, the top plate 21 has the same shape as the opening (also referred to as the shape) or a slightly larger shape. The second soundproof wall 22 has a cross-sectional shape smaller than the cross-sectional shape of the first soundproof wall 12,
It is located on the inner peripheral portion of the first soundproof wall 12 when fitted together. Therefore, this second soundproof wall 22 also
In a state of standing on the surface of the top plate 11, it has a rectangular box shape having an opening at the bottom.

The lower soundproof member 10 and the upper soundproof member 2
A groove 23 that fits with the tip of the first soundproof wall 12 when 0 is fitted is provided in the top plate 21, and a groove 13 that fits with the tip of the second soundproof wall 22 is provided in the bottom plate 11. .

As the material of the lower soundproofing member 10 and the upper soundproofing member 20, various synthetic resins, metals, ceramics and the like can be used, but from the viewpoint of moldability, it is preferable to use the synthetic resin. In particular, various fillers such as talc, calcium carbonate, barium sulfate,
It is preferable to use glass fibers or the like to increase the density of the soundproof member to improve the sound insulation effect. Alternatively, a foaming resin or the like may be used.

When the top plate 21 itself of the upper soundproof member 20 is used as a mounting portion for electrical components, a flame-retardant material such as flame-retardant styrene resin, modified PPE (polyphenylene ether) resin or polycarbonate resin is used. Is preferably used. The molding method may be any method as long as it can mold a desired shape, but when a synthetic resin is used as a material, it is preferable to use an injection molding method or the like from the viewpoint of productivity and the like.

Further, in the soundproof unit of the embodiment shown in FIGS. 1 and 2, the sound absorbing material 25a is provided between the inner peripheral surface of the second soundproof wall 22 and the first and second soundproof walls 12 and 22. , 25b
Is provided. As the sound absorbing materials 25a and 25b, at least one or more kinds of plant, animal, mineral, and synthetic resin fibers and a synthetic resin binder, a bulky nonwoven fabric made of a flame retardant material, felt, urethane, vinyl chloride, A synthetic resin foam made of modified polyethylene or the like can be used. In the case of the present embodiment, the sound absorbing materials 25a, 25
b is provided on the upper soundproof member 20 side, and is provided with the sound absorbing material 25.
The a and 25b are attached to the upper soundproof member 20 by using an adhesive or integrally at the time of injection molding. If integrally performed during injection molding, the manufacturing process can be simplified. The thickness of the sound absorbing materials 25a and 25b is appropriately determined in consideration of the amount of noise generated from the device or various conditions such as the place where the outdoor unit of the air conditioner is installed.

The soundproof unit having such a structure is
Use by fitting as follows. Lower soundproof member 10
Is placed in a place where an outdoor unit of an air conditioner is installed, and devices such as a fan and a compressor are placed (installed) on the bottom plate 11. At this time, the device 30, which is a noise source, is placed inside the cylindrical first soundproof wall 12. Next, sound absorbing material 25
The upper soundproof member 20 to which a and 25b are attached is fitted from the opening side of the lower soundproof member 10 so that the second soundproof wall 22 is located on the inner peripheral side of the first soundproof wall 12. Then, the upper soundproofing member 10 is pressed down from above, and the tip end of the first soundproof wall 12 is fitted into the groove 23 of the top plate 21, and the tip end of the second soundproof wall 22 is fitted into the groove 13 of the bottom plate 11, respectively. The upper and lower soundproof members 10 and 20 are fixed. In addition,
Although not shown in the drawing, holes for piping and wiring are formed in the lower and upper soundproof members 10 and 20, and the piping and wiring required for the device 30 are performed through these holes, and
After wiring, seal this hole to prevent noise from leaking. Further, when the bottom plate 11 is thinly formed, when the device 30 such as a fan and a compressor is placed on the bottom plate 11, the bottom plate 11 may bend, but in such a case, It is also possible to attach ribs or the like to the bottom surface of the bottom plate 11 for reinforcement.

FIG. 3 is a sectional view of the essential parts of a second embodiment of the soundproofing unit of the present invention. In the case of this embodiment, the lower soundproof member 10
The second soundproof wall 22 of the upper soundproof member 20 is located on the outer peripheral side of the first soundproof wall 12 of
5a and 25b are attached to the lower soundproof member 10 side.
Also in the case of the second embodiment, the same soundproof effect as that of the soundproof unit of the first embodiment is exhibited.

FIG. 4 shows a sectional view of the essential parts of a third embodiment of the soundproofing unit of the present invention. In the case of this embodiment, the lower soundproof member 10
First soundproof wall 12 and second soundproof wall 22 of the upper soundproof member 20
No sound absorbing material is provided between the spaces. In the case of the third embodiment, it can be applied to a device that does not generate much noise, and the cost can be reduced. In the case where the sound absorbing material is not provided, the soundproof walls 12 and 22 may be in close contact with each other without forming a space between the first soundproof wall 12 and the second soundproof wall 22.

FIG. 5 is a sectional view of the essential parts of a fourth embodiment of the soundproofing unit of the present invention. In the case of this embodiment, the lower soundproof member 10
The first soundproof walls 12 and 12 are doubled, and the second soundproof wall 22 of the upper soundproof member 20 is fitted between the doubled first soundproof walls 12 and 12. FIG. 6 shows a sectional view of the essential parts of a fifth embodiment of the soundproofing unit of the present invention. In the case of this embodiment, the first and second soundproof walls 12 and 22 of the lower and upper soundproof members 10 and 20, respectively, are doubled and alternately fitted. When one or both of the first and second soundproof walls are multiplexed, as in the soundproofing unit shown in the fourth and fifth embodiments, the soundproofing effect can be enhanced without providing a sound absorbing material. . In addition, the second and first soundproof walls 2 are provided on the bottom plate 11 and the top plate 21.
Grooves 13 and 24 for fitting the tips of 2 and 12 are unnecessary.

The soundproofing unit of the present invention can be variously modified within the scope of the invention other than the above-mentioned embodiment, for example, the first and second soundproofing walls 12 and 22 may be formed in a circular shape, A sealing material may be used to fix (seal) the first and second soundproof walls 12 and 22 when the lower soundproof member 10 and the upper soundproof member 20 are fitted to each other.

Next, the results of a comparison experiment between an embodiment in which the soundproofing unit of the present invention is more concretely shown and a comparative example will be shown. Example 25 Polypropylene containing 20 wt% of glass fiber
Injection molding is performed at a molding temperature of 0 ° C. to form a bottom plate having a thickness of 3.0 mm and a first soundproof wall having a thickness of 2.5 mm, and flame-retardant polystyrene is molded at a temperature of 220 ° C. Was injection-molded to form an upper soundproof member having a top plate / electrical component mounting box having a thickness of 3.0 mm and a second soundproof wall having a thickness of 2.5 mm. Also, as a sound absorbing material, 15 mm is provided on both sides of the second soundproof wall of the upper soundproof member and the lower surface of the top plate.
The thickness of the flexible urethane foam was adhered. The compressor and accumulator were covered with such a lower soundproof member and an upper soundproof member as shown in FIG. Comparative Example 1.5 consisting of butyl rubber, asphalt and inorganic filler
A cylindrical three-dimensional sound insulation in which a material having a thickness of 15 mm and a felt with a thickness of 15 mm is attached as a sound absorbing material to form a tubular body, and one of them is bent and adhered, and only the other is opened. The unit was molded. Then, the compressor and accumulator 30 placed (installed) on the bottom plate 51 were covered with this soundproofing unit (see FIG. 7). Experimental method Set the control of the indoor unit of the air conditioner installed in a room with a room temperature of 30 ° C or higher to 16 ° C and leave it for 10 minutes for input.
The noise of the air conditioner indoor unit was measured. Experimental Results [Hz] 250 500 1K 2K 4K Example [dB] 34 38 37 35 26 Comparative Example [dB] 39 43 44 35 30 From this, it was found that the soundproofing unit of the example is superior in soundproofing effect. did.

[0020]

As described above, according to the present invention, it is possible to obtain a soundproofing unit which can be constructed only by simple forming work and assembling work and which has a high soundproofing effect.

[Brief description of drawings]

FIG. 1 is a perspective view of a soundproofing unit according to a first embodiment of the present invention, in which a main part is cut off.

FIG. 2 is a cross-sectional view of a main part before fitting the soundproofing unit of FIG.

FIG. 3 is a cross-sectional view of an essential part of a second embodiment of the soundproofing unit of the present invention.

FIG. 4 is a cross-sectional view of an essential part of a third embodiment of the soundproofing unit of the present invention.

FIG. 5 is a cross-sectional view of an essential part of a fourth embodiment of the soundproofing unit of the present invention.

FIG. 6 is a sectional view of the essential parts of a fifth embodiment of the soundproofing unit of the present invention.

FIG. 7 shows a sectional view of a soundproofing unit used in an experiment of a comparative example.

[Explanation of symbols]

 10 ... Lower soundproof member 11 ... Bottom plate 12 ... First soundproof wall 13 ... Groove 20 ... Upper soundproof member 21 ... Top plate 22 ... Second soundproof wall 23 ... Groove 25a, 25b ... Sound absorbing material 30 ... Equipment

Claims (3)

[Claims] 1. A bottom plate on which a device as a noise source is placed, a lower soundproof member integrally formed with a cylindrical first soundproof wall surrounding the device, and an opening shape of the first soundproof wall. A top plate having the same or a large shape, and a cylindrical soundproof wall surrounding the periphery of the device, the second soundproof wall having a cross-sectional shape larger or smaller than the cross-sectional shape of the first soundproof wall are integrally formed. A soundproofing unit comprising a molded upper soundproofing member, wherein the lower soundproofing member and the upper soundproofing member are fitted to each other so that the first and second soundproof walls form a double wall. 2. The soundproof unit according to claim 1, wherein a soundproof wall similar to the first and second soundproof walls is multiply provided on at least one of the bottom plate and the top plate. 3. The soundproof unit according to claim 1, wherein a sound absorbing material is provided between at least one of the soundproof walls and at least one of the innermost soundproof walls.