JP2007218568A - Exhaust device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently absorb noise without causing the disturbance of an air flow discharged and sucked into a hood, and to easily replace a sound absorbing body. <P>SOLUTION: This exhaust device comprises the hood H installed in an air suction port 11 of an outdoor machine 1 of a gas heat pump, and the sound absorbing body 3 which is arranged at a position opposed to a blow-off port 24 of the hood H and apart by a predetermined length from the hood H on the outer wall surface of the outdoor machine 1. The sound absorbing body 3 is arranged at a position opposed to the blow-off port 24 of a hood body 2 and apart by a predetermined length from the hood body 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an exhaust device, and more particularly, to an exhaust device that can efficiently absorb noise generated from an intake port and an exhaust port of an air conditioner (hereinafter referred to as “air conditioner”).

  In general, in an air conditioner installed in a building, it is desired to reduce noise generated from a compressor of the air conditioner or wind noise of a fluid discharged from a hood outlet attached to an outer wall surface of the building or the like.

  For this reason, in the conventional exhaust apparatus, the noise is reduced by using a soundproof hood in which a sound absorbing material is attached to the inner surface side of the hood (for example, see Patent Document 1).

  However, the exhaust device having such a noise reduction function has the following difficulties.

  First, it is impossible to efficiently absorb noise in a low frequency region of about 100 to 200 Hz only by attaching a normal sound absorbing material, that is, a glass wool or glass cloth, to the inner surface of the hood.

  Secondly, the sound absorbing material is deteriorated with age due to water vapor, oil mist, etc. contained in the exhausted exhaust or exhaust gas flowing in the soundproof hood, and the sound absorbing effect is reduced.

  Third, the flow of exhaust gas is disturbed due to adhesion of dust or the like to the sound absorbing material or a change in form due to aging of the sound absorbing material.

  Fourthly, in an exhaust device having a configuration in which a sound absorbing material is attached to the inner surface of the hood, replacement of a sound absorbing material that has deteriorated over time becomes complicated.

JP-A-6-2912

  The present invention does not disturb the flow of the airflow discharged and sucked into the hood, can efficiently absorb noise in a low frequency region of about 200 Hz or less, and can replace a sound absorber that has deteriorated over time. An object of the present invention is to provide an exhaust device that can be easily performed.

  The exhaust device according to the first aspect of the present invention includes a hood that forms a fluid flow path, and a sound absorber that is spaced apart from the hood at a position facing the air outlet of the hood.

  An exhaust system according to a second aspect of the present invention includes a hood that forms a fluid flow path, and a sound absorber that is disposed at a position facing the air outlet of the hood and is spaced apart from the hood. Is a laminate of other sound absorbers.

  According to a third aspect of the present invention, in the exhaust device according to the first aspect or the second aspect, the sound absorber and / or another sound absorber includes a low-frequency sound absorber.

  According to a fourth aspect of the present invention, in the exhaust device according to the third aspect, the low-frequency sound absorbing material includes a film made of rubber and a porous body layer laminated on a surface opposite to the sound source side of the film. It is to be prepared.

  According to a fifth aspect of the present invention, in the exhaust device according to the third aspect, the low-frequency sound absorbing material includes a film made of rubber, a porous body layer laminated on a surface opposite to the sound source side of the film, And another porous body layer laminated on the sound source side surface of the membrane.

  According to a sixth aspect of the present invention, in the exhaust device according to the fourth or fifth aspect, the rubber is made of silicone rubber.

According to a seventh aspect of the present invention, in the exhaust device according to any one of the fourth to sixth aspects, the combustion heat generation amount of the film is 8 MJ / m ² or less.

According to an eighth aspect of the present invention, in the exhaust device according to any one of the fourth to seventh aspects, the combustion heat generation rate of the film is set to [200 kW / m ² ] · 10 sec or less. It is.

  According to a ninth aspect of the present invention, in the exhaust device according to the fourth aspect or the fifth aspect, the rubber is natural rubber, isoprene rubber, styrene butadiene rubber, butadiene rubber, nitrile butadiene rubber, butyl rubber, ethylene propylene rubber, It is made of any rubber selected from fluorine rubber, chlorosulfonated polyethylene rubber, chlorinated polyethylene rubber, epichlorohydrin rubber, polysulfide rubber, and polyolefin.

  According to a tenth aspect of the present invention, in the exhaust device according to any one of the fourth to ninth aspects, the membrane includes an inorganic compound.

  According to an eleventh aspect of the present invention, in the exhaust apparatus according to the tenth aspect, the inorganic compound is a compound containing any one of Si, Ca, Sr, and Ba, or any one of Si, Ca, Sr, and Ba. It consists of a mixture of compounds containing seeds.

  According to a twelfth aspect of the present invention, in the exhaust device according to any one of the fourth to eleventh aspects, the porous body layer is formed of a material having flame retardancy.

  According to a thirteenth aspect of the present invention, in the exhaust device according to any one of the fourth to twelfth aspects, the porous body layer is made of glass wool, rock wool, or a mixture thereof. is there.

  A fourteenth aspect of the present invention is the exhaust apparatus according to any one of the fourth to thirteenth aspects, wherein the membrane is integrated with the porous body layer.

  According to a fifteenth aspect of the present invention, in the exhaust device according to any one of the fifth to thirteenth aspects, the membrane is integrated with one of the porous body layer and the other porous body layer. It has become.

  A sixteenth aspect of the present invention is the exhaust apparatus according to the fourteenth aspect or the fifteenth aspect, wherein the membrane is integrated with the porous body layer and / or another porous body layer by adhesion. .

  According to a seventeenth aspect of the present invention, in the exhaust device according to the fourteenth aspect or the fifteenth aspect, the membrane is integrated with the porous body layer and / or another porous body layer by heat fusion. It is.

  According to an eighteenth aspect of the present invention, in the exhaust device according to the fourteenth aspect or the fifteenth aspect, the membrane is integrated with the porous body layer and / or another porous body layer by a silicone graft reaction. It is.

  According to a nineteenth aspect of the present invention, in the exhaust device according to the fourteenth aspect or the fifteenth aspect, a part of the film enters the pores of the porous body layer and / or another porous body layer. By this, it is integrated with the porous body layer and / or other porous body layers.

  The exhaust device according to the first to nineteenth aspects of the present invention has the following effects.

  First, it is possible to absorb noise efficiently without attaching a sound absorber to the inner surface of the hood, and as a result, a noise reduction function that does not disturb the flow of air that is exhausted and sucked into the hood. The exhaust apparatus which has can be provided.

  Second, since the sound absorber is not attached to the inner surface of the hood, and the sound absorber formed separately from the hood can be disposed in the vicinity of the hood so that the sound absorber can be replaced. If it has deteriorated over time, it can be easily replaced.

  Thirdly, when a low-frequency sound absorbing material is used as the sound absorber, noise in a low frequency region of about 100 to 200 Hz can be efficiently absorbed.

  Fourth, because the low frequency sound absorbing material itself as a sound absorber is given flame retardancy that complies with the flame retardant standards in the Building Standards Act, the low frequency sound absorbing material is required to be flame retardant. Can be arranged.

  Fifth, since low-frequency sound absorbing materials as sound absorbers do not use halogen-based flame retardants or lead-based compounds as flame retardants, there is no risk of toxic gases being generated during combustion, and environmental protection measures are taken. An exhaust device can be provided.

  Sixth, according to the low-frequency sound-absorbing material as a sound-absorbing body provided with porous layers on both sides of the film, it is possible to efficiently absorb noise not only in a low-frequency region of 200 Hz or less but also in a high-frequency region exceeding 200 Hz. it can.

  Seventh, according to the low-frequency sound-absorbing material as the sound-absorbing material in which the membrane is integrated with the porous body layer, the degree of freedom of the product form can be improved.

Hereinafter, a preferred embodiment to which an exhaust device of the present invention is applied will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is an explanatory diagram showing a preferred embodiment in which the exhaust device according to the present invention is applied to an outdoor unit of a gas heat pump (GHP).

  In the figure, an exhaust device according to the present invention includes a hood H installed at an inlet 11 of an outdoor unit 1 of a gas heat pump (not shown), and an outlet (described later) 24 of the hood H on an outer wall surface 12 of the outdoor unit 1. And a sound absorber 3 disposed at a position spaced apart from the hood H by a predetermined length. In the figure, reference numeral 12 denotes an exhaust port.

  The hood H includes a hood main body 2 that forms a flow path for fluid such as exhaust, and the hood main body 2 collects noise on the lower side (floor side) of the outer wall surface 12 of the outdoor unit 1. It is made up of things that can. Specifically, a side surface of the hood main body 2 is provided by including a roof member 21 having an arcuate curved surface and a pair of side wall members 22a and 22b arranged so as to face both side edges of the roof member 21. An open portion 23 is formed on the side (side facing the intake port 11 of the outdoor unit 1), and an air outlet 24 is formed on the lower side (side facing the floor (described later) 4).

  Further, the hood main body 2 is formed of a material that does not transmit noise to the outside of the hood main body 2. Specifically, the roof member 21 and the pair of side wall members 22a and 22b are an iron plate having a thickness of 1.6 mm or more, or a rigid body having a surface density equivalent to the iron plate, for example, an aluminum plate having a thickness of about 5 mm. Is formed. The roof member 21 and the pair of side wall members 22a and 22b are formed as a single body.

  The sound absorber 3 is composed of a plate-like member, and is disposed at a position facing the air outlet 24 of the hood main body 2 at a predetermined distance from the hood main body 2. Specifically, the exhaust gas discharged from the air outlet 24 is efficiently applied to the sound absorber 3 at a position separated from the lower end of the hood body 2 (opening surface of the air outlet 24) by about 450 to 900 mm, that is, the sound absorption. The horizontal surface of the body 3 is disposed so as to be parallel to the opening surface of the air outlet 24 of the hood body 2.

  As the sound absorber 3, a material that exhibits excellent sound absorption characteristics in a low frequency region of about 100 to 200 Hz, specifically, a low frequency sound absorbing material previously filed by the present inventors is suitable (Japanese Patent Application). 2005-77593).

  As shown in FIG. 2, a low-frequency sound absorbing material (hereinafter referred to as “first low-frequency sound absorbing material”) as the sound absorber 3 includes a film 31 made of silicone rubber and a sound source side (including noise) of the film 31. A porous body layer (hereinafter referred to as “first porous body layer”) 32 is provided on the opposite side (hereinafter referred to as “rear side”) to the side opposite to the exhaust or the like. Here, the first porous body layer 32 is laminated on the back side of the film 31 made of silicone rubber because the part of the film 31 acts as an additional mass, that is, the role of a weight. This is because the portion 32 acts as a spring, that is, an air spring, and performs sound absorption by membrane vibration.

  The first low-frequency sound-absorbing material 3a as the sound-absorbing body 3 having such a configuration has the first porous body layer 32 on the floor surface 4 side with respect to the floor surface 4 as a rigid wall layer made of concrete or the like. A predetermined sound-absorbing effect can be obtained by installing and parallel to the floor surface 4.

  The film 31 is made of a material that has flame retardancy and does not generate harmful gas during combustion. Specifically, it is formed by mixing barium sulfate with silicone rubber as will be described later.

  Next, various performances required for the film 31 having such a configuration will be described.

First, it is preferable to use a film 31 having a combustion heat generation amount per unit volume of 8 MJ / m ² or less. This is because if the calorific value per unit volume of the membrane 31 exceeds 8 MJ / m ² , it cannot conform to the non-combustible grade defined in the Building Standard Act Article 2 No. 9 which is the applicable regulation of the product according to this embodiment. . Note that the amount of combustion heat generated by the film 31 can be adjusted by the type and amount of the inorganic filler to be blended in the raw material resin for the film 31.

According to the above-described film 31 made of silicone rubber, in a test piece having a width of 100 mm, a length of 100 mm, and a thickness of 3 to 50 mm, a combustion heat value per unit volume is 8 MJ / m in a combustion heat value test specified by ISO5660. ² or less.

Second, it is preferable to use a film 31 having a heat generation rate of combustion of [200 kW / m ² ] · 10 sec or less. This is because if the heat generation rate of combustion of the film 31 exceeds [200 kW / m ² ] · 10 sec ³ , it does not conform to the non-combustible grade specified in Article 2, Item 9 of the Building Standard Law.

According to the above-described film 31 made of silicone rubber, in a test piece having a width of 100 mm, a length of 100 mm, and a thickness of 3 to 50 mm, the combustion heat generation rate is set to [200 kW / m ² ] in a combustion heat generation rate test defined by ISO5660. It can be 10 sec or less.

  Next, the 1st porous body layer 32 is formed with the material which has a flame retardance. Specifically, it is made of glass wool, rock wool or a mixture thereof. The first porous body layer 32 is formed with a thickness of 1 to 50 mm, preferably 10 to 25 mm. The first porous body layer 32 having such a configuration has excellent sound absorption characteristics over a wide range from a low frequency region to a high frequency region, and is effective in reducing solid propagation sound and vibration. Exhibits tremor.

  The film 31 having such a configuration is preferably integrated with the first porous body layer 32 by adhesion, silicone graft reaction, or the like in order to improve the degree of freedom of the product form and simplify the construction on site.

  According to the first low-frequency sound-absorbing material 3a having such a configuration, the low-frequency sound-absorbing material itself is provided with flame retardancy that complies with the flame-retardant standards in the Building Standards Act. It can be installed in a place where flame retardancy is required, and no halogen flame retardant or lead compound is used as a flame retardant. There is no possibility of occurrence, and furthermore, since the membrane 31 is integrated with the first porous body layer 32, construction on site can be easily performed.

  Here, in the above-described embodiment, the case where the film 31 is formed of only silicone rubber is described. However, the film 31 is formed of silicon, rubber, Si, Ca, Sr, Ba at a ratio of 2: 1 to 1: 1. It may be formed by mixing an inorganic compound composed of a compound containing any one of the above or a mixture of compounds containing any one of Si, Ca, Sr, and Ba.

  In the membrane 31 having such a structure, a high bulk density and a small particle size of barium sulfate or the like are mixed into the porous chamber portion of the silicone rubber having a network structure, so that it is nonflammable and flexible, and has a predetermined value. A film having an areal density can be formed.

  FIG. 3 is an explanatory diagram showing the sound absorption coefficient, surface density, film thickness, heat generation amount, and heat generation rate of the film in the first low frequency sound absorbing material 3a of the present invention together with a comparative example.

  Here, the film of this example is formed by mixing silicone rubber with silica, calcium carbonate, strontium carbonate, and barium sulfate at a ratio of 2: 1, and a film made of urethane is used as a comparative example. .

  The calorific value was measured by the method specified in Article 2, Item 9 of the Building Standard Law, and the heat generation rate was measured by the method specified by ISO5660.

From the figure, it is possible to obtain the sound absorption coefficient and the surface density equivalent to those of the comparative example, even if the film thickness of the present example is about 1/3 thinner than that of the comparative example. Moreover, it can adapt to the nonflammable grade prescribed | regulated to Building Standard Act Article 2 No. 9, and also can make a combustion heat release rate less than [200kW / m < ² >] * 10sec.

  FIG. 4 shows the sound absorption characteristics of the first low-frequency sound absorbing material 3 a as the sound absorber 3. Here, in the figure, the dotted line L1 indicates the sound absorption characteristics of a conventional sound absorbing material in which the thickness of the porous body layer (glass wool) is 100 mm, and the solid line L2 indicates the thickness of the film (silicone rubber film) 31 by 0.5 mm. The sound absorption characteristics of the first low-frequency sound absorbing material 3a in which the thickness of the first porous body layer (glass wool) 32 is 50 mm are shown.

  From the figure, the conventional sound absorbing material (L1) has a high sound absorption rate in a high frequency region exceeding about 200 Hz, but has a low sound absorption rate in a low frequency region of about 200 Hz or less, whereas the first low frequency sound absorption material. It can be seen that the material 3a (L2) has a low sound absorption rate in a high frequency region of 200 Hz or higher, but has a high sound absorption rate in a low frequency region of 200 Hz or less. Therefore, if the 1st low frequency sound-absorbing material 3a is used, the exhaust apparatus which can respond to a low frequency area | region can be provided.

  FIG. 5 shows a comparison of power levels depending on whether or not the first low-frequency sound absorbing material 3 a as the sound absorbing body 3 is installed on the floor surface 4. Here, in the comparative example, the measurement point P when a so-called normal air conditioner is operated at a rated value without installing a sound absorber on the floor surface 4 (at a position spaced 1 m forward from the outdoor unit 1 and 1 m above the floor surface 4) In the embodiment, the first low-frequency sound-absorbing material 3a (the film 31 made of silicone rubber has a thickness of 0.5 mm, and is made of glass wool. The power level of the exhaust device according to the first embodiment in which a low-frequency sound absorbing material in which the thickness of the first porous body layer 32 is 50 mm is disposed. The noise level was measured according to JIS A 1409: 1998 “Method for measuring sound absorption coefficient of reverberation room method”.

  From the figure, the exhaust system in the present embodiment shows a superior difference of about 8 dB in the sound absorption characteristic of 200 Hz, which is the dominant noise in the living room, compared to the comparative example, and the exhaust system in the present invention is an extremely effective noise prevention measure. It turns out to be effective.

As described above, according to the exhaust device having such a configuration, first, since the sound absorbing body is not attached to the inner surface of the hood, the flow of the airflow discharged and sucked into the hood is disturbed. Second, since the sound absorbing body separate from the hood is disposed in the vicinity of the hood so that the sound absorbing body is deteriorated over time, it can be easily replaced. Thirdly, when a low-frequency sound absorbing material is used as the sound absorber, noise in a low-frequency region of about 100 to 200 Hz can be efficiently absorbed, and fourth, the building standard is applied to the low-frequency sound absorbing material itself. Since the flame retardancy conforming to the flame retardance standard in the law is given, the low frequency sound absorbing material can be disposed in a place where the flame retardancy is required. Fifth, the low frequency sound absorbing material Does not use halogen flame retardants or lead compounds, There is no possibility that toxic gas is generated during firing, and an exhaust device with environmental protection measures can be provided. Sixth, according to the low-frequency sound absorbing material having porous layers on both sides of the membrane, 200 Hz It can efficiently absorb noise not only in the following low frequency region but also in a high frequency region exceeding 200 Hz. Seventh, according to the low frequency sound absorbing material in which the membrane is integrated with the porous body layer, The degree of freedom can be improved.
[Second Embodiment]
FIG. 6 shows a sectional view of a film-like sound absorbing structure using the first low-frequency sound absorbing material 3a. In the figure, the same reference numerals are given to the parts common to those in FIG.

  In FIG. 6, the film-like sound absorbing structure according to the present invention has a floor surface 4 made of concrete or the like as a rigid wall layer, the sound source side of the floor surface 4 and the first porous body layer 32 facing the floor surface 4 side. The film-like first low-frequency sound absorbing material 3a installed parallel to the floor surface 4 via the pair of support members 33a and 33b, the first low-frequency sound absorbing material 3a, and the floor surface 4 are partitioned. And a back air layer 34.

In the film-like sound absorbing structure as the sound absorber 3 having such a configuration, the back air layer 34 acts as a spring with respect to the mass of the film-like first low-frequency sound absorbing material 3a to form a single resonance system. When the frequency of the sound wave coincides with the resonance frequency of this single resonance system, the film-like first low-frequency sound absorbing material 3a vibrates and is absorbed by internal friction. Therefore, according to the film-like sound absorbing structure using the first low-frequency sound absorbing material 3a, it is possible to further improve the sound absorption rate compared to the exhaust device in the first embodiment described above.
[Third Embodiment]
FIG. 7 is a cross-sectional view showing another low frequency sound absorbing material (hereinafter referred to as “second low frequency sound absorbing material”) as the sound absorbing body 3 in the present invention. In the figure, parts common to those in FIG. 2 are denoted by the same reference numerals and detailed description thereof is omitted.

  In FIG. 7, the second low frequency sound absorbing material 3b as the sound absorbing body 3 of the present invention includes a film 31 made of silicone rubber, a first porous body layer 32 laminated on the back side of the film 31, and a film. And a porous body layer (hereinafter referred to as “second porous body layer”) 35 laminated on the sound source side (front side of the film 31).

  Here, the first and second porous body layers 32 and 35 are laminated on both surfaces of the membrane 31 because the membrane 31 portion acts as an additional mass, that is, a role of a weight, and the first and second porous layers. This is because the material layers 32 and 35 act as a spring, that is, an air spring, and perform sound absorption by membrane vibration.

  The second porous body layer 35 is composed of the same material as the first porous body layer 32 described above. The membrane 31 is preferably integrated with at least one of the first and second porous body layers 32 and 35 by the same means as described above.

  The second low-frequency sound-absorbing material 3b as the sound-absorbing body 3 having such a configuration has the first porous body layer 32 facing the floor surface 4 side with respect to the floor surface 4 serving as a rigid wall layer, and By installing in parallel with the floor surface 4, an exhaust device according to the present invention is formed.

  FIG. 8 shows the sound absorption characteristics of the second low-frequency sound absorbing material 3b. Here, in the figure, the dotted line L1 is the sound absorption characteristic of a conventional sound absorbing material in which the thickness of the porous body layer (glass wool) is 100 mm, and the solid line L3 is a film (silicone rubber film), as shown in FIG. ) The second low frequency, in which the thickness of 31 is 0.5 mm, the thickness of the first porous body layer (glass wool) 32 is 50 mm, and the thickness of the second porous body layer (glass wool) 35 is 50 mm. The sound absorption characteristic of the sound absorbing material 3b is shown.

  As shown in the figure, the conventional sound absorbing material (L1) has a high sound absorption rate in a high frequency region exceeding about 200 Hz, but has a low sound absorption rate in a low frequency region of about 200 Hz or less. 2 shows that the low-frequency sound absorbing material 3b (L3) exhibits excellent sound absorption characteristics not only in a low frequency region of about 200 Hz or less but also in a high frequency region of about 200 Hz or more. Therefore, if the second low-frequency sound absorbing material 3b as the sound absorbing body 3 is used, an exhaust device that can efficiently absorb noise in a wide frequency range can be provided.

  FIG. 9 shows a comparison of power levels depending on whether or not the second low-frequency sound absorbing material 3 b as the sound absorbing body 3 is installed on the floor surface 4. Here, the comparative example shows the power level at the measurement point P when a so-called normal air conditioner is operated at a rated value, in which a sound absorber is not installed on the floor surface 4 as described above. 4. The second low-frequency sound absorbing material 3b (the thickness of the film 31 made of silicone rubber is 0.5 mm, and the thickness of the first and second porous layers 32 and 35 made of glass wool is 50 mm. The power level of the exhaust device in which the low-frequency sound absorbing material is disposed is shown. The noise level was measured in accordance with JIS A 1409: 1998 “Measurement method of sound absorption coefficient of reverberation chamber” in the same manner as described above.

  From the figure, the exhaust system in the present embodiment shows a superior difference of about 5 dB in the sound absorption characteristics of 200 Hz, which is the dominant noise in the living room, compared with the comparative example, and the exhaust system in the present invention is an extremely effective noise prevention measure. It turns out to be effective.

Therefore, if the second low-frequency sound absorbing material 3b as the sound absorber 3 is used, the same effect as the exhaust device in the first embodiment described above can be obtained, and noise in a high frequency region exceeding about 200 Hz can be efficiently obtained. An exhaust device that can absorb well can be provided.
[Fourth Embodiment]
FIG. 10 shows a sectional view of a film-like sound absorbing structure using the second low-frequency sound absorbing material 3b. In the figure, parts common to those in FIGS. 2, 6 and 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 10, the sound absorber in the present invention is a pair of support members, with the floor surface 4 as a rigid wall layer and the sound source side of the floor surface 4 and the first porous body layer 32 facing the floor surface 4 side. A film-like second low-frequency sound absorbing material 3b installed parallel to the floor surface 4 through 33a and 33b, and a back air layer 34 partitioned by the second low-frequency sound absorbing material 3b and the floor surface 4 I have.

  In the film-like sound absorbing structure using the second low-frequency sound absorbing material 3b as the sound absorbing body 3, the back air layer with respect to the mass of the film-like second low-frequency sound absorbing material 3b as described above. 34 acts as a spring to form a single resonance system, and when the frequency of the sound wave matches the resonance frequency of this single resonance system, the film-like second low-frequency sound absorbing material 3b vibrates and is absorbed by internal friction. Will be.

Therefore, according to the film-like sound absorbing structure using the second low frequency sound absorbing material 3b as the sound absorbing body 3, the sound absorption rate can be further improved as compared with the above-described exhaust device.
[Fifth Embodiment]
FIG. 11 shows an embodiment in which a sound absorbing hood Ha is used instead of the hood H shown in FIG. In the figure, parts common to those in FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted.

  11, in this embodiment, the low frequency sound absorbing material 3 a shown in FIG. 2 or the low frequency sound absorbing material 3 b shown in FIG. 7 attaches the first porous body layer 32 of the hood main body 2 to the inner surface of the hood main body 2. It is laminated toward the inner surface side.

  According to the exhaust device using the hood Ha having such a sound absorbing structure, noise can be absorbed also in the hood Ha, and therefore, noise in a lower frequency region can be absorbed more efficiently than the above-described exhaust device. be able to.

  FIG. 12 shows a comparison of power levels depending on whether or not the second low-frequency sound absorbing material 3b as the sound absorbing body 3 and the sound absorbing hood Ha are installed on the floor surface 4. Here, the comparative example shows the power level at the measurement point P when a so-called normal air conditioner is operated at a rating without installing a sound absorber on the floor surface 4 as described above. In addition, the thickness of the second low-frequency sound absorbing material 3b (the film 31 made of silicone rubber is 0.5 mm, and the thickness of the first and second porous layers 32 and 35 made of glass wool is 50 mm. Low-frequency sound absorbing material), and further, the power of the exhaust device in which the first low-frequency sound absorbing material 3a is laminated on the inner surface side of the hood body 2 with the first porous body layer 32 facing the inner surface side of the hood body 2. Indicates the level. The noise level was measured in accordance with JIS A 1409: 1998 “Measurement method of sound absorption coefficient of reverberation chamber” in the same manner as described above.

  From the figure, the exhaust system in the present embodiment shows a superior difference of about 10 dB in the sound absorption characteristic of 200 Hz, which is the dominant noise in the living room, compared with the comparative example, and the exhaust system in the present invention is an extremely effective noise prevention measure. It turns out to be effective.

Therefore, if the sound absorbing hood Ha is used, noise can be absorbed more efficiently than the above-described exhaust device.
[Sixth Embodiment]
FIG. 13 is an explanatory view showing a preferred embodiment in which the exhaust device according to the present invention is applied to an outdoor unit of a domestic air conditioner. In the figure, parts common to those in FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted.

  In the drawing, the exhaust device according to the present invention is provided with a hood h at an exhaust port 51 of an outdoor unit 5 of a home air conditioner (not shown).

  In this embodiment, the air outlet 24 is disposed toward the ceiling 6 of the building at a position where the open portion 23 of the hood body 2 faces the exhaust port 51 of the outdoor unit 5, and further, a plate-like sound absorber. 3 is located at a position separated from the upper end of the hood main body 2 (opening surface of the air outlet 24) by about 450 to 900 mm so that the exhaust discharged from the air outlet 24 efficiently strikes the sound absorber 3, that is, the sound absorber 3 The horizontal plane is disposed so as to be parallel to the opening surface of the air outlet 24 of the hood body 2.

  FIG. 14 shows a comparison of power levels depending on whether or not the first low-frequency sound absorbing material 3 a as the sound absorbing body 3 is installed on the ceiling 6. Here, the comparative example is a measurement point P when a so-called normal air conditioner is not operated on the ceiling 6 and is operated at a rating (at a position 1 m forward from the outdoor unit 1 and 1 m above the floor 4. The power level at the separated position is shown. In the embodiment, the first low-frequency sound absorbing material 3a (the film 31 made of silicone rubber is 0.5 mm in thickness and the first made of glass wool is formed on the ceiling 6. The power level of the exhaust device in which a low-frequency sound absorbing material having a thickness of the porous body layer 32 of 50 mm is disposed is shown. The noise level was measured in accordance with JIS A 1409: 1998 “Measurement method of sound absorption coefficient of reverberation chamber” in the same manner as described above.

  From the figure, the exhaust system in the present embodiment shows a superior difference of about 8 dB in the sound absorption characteristic of 200 Hz, which is the dominant noise in the living room, compared to the comparative example, and the exhaust system in the present invention is an extremely effective noise prevention measure. It turns out to be effective.

Therefore, in this embodiment as well as the above-described exhaust device, the flow of the airflow exhausted and sucked into the hood is not disturbed, and the sound absorber that has deteriorated over time can be easily replaced. When a low-frequency sound absorbing material is used as the body, it is possible to efficiently absorb noise in a low-frequency region of about 100 to 200 Hz.
[Seventh Embodiment]
FIG. 15 shows an embodiment in which a sound absorbing hood ha is used instead of the hood h shown in FIG. In the figure, parts common to those in FIG. 13 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, the low frequency sound absorbing material 3 a shown in FIG. 2 or the low frequency sound absorbing material 3 b shown in FIG. 7 is directed to the inner surface of the hood body 2 on the inner surface of the hood body 2. Are stacked.

  According to the exhaust device using the hood ha having such a sound absorbing structure, noise can be absorbed also in the hood ha, and therefore, noise in a lower frequency region can be absorbed more efficiently than the above-described exhaust device. be able to.

  FIG. 16 shows a comparison of power levels depending on whether or not the second low-frequency sound absorbing material 3 b as the sound absorbing body 3 and the hood ha having a sound absorbing structure are installed on the ceiling 6. Here, the comparative example shows the power level at the measurement point P when a so-called normal air conditioner is operated at a rating without installing a sound absorber on the ceiling 6 as described above. The second low-frequency sound-absorbing material 3b described above (low frequency with the thickness of the film 31 made of silicone rubber being 0.5 mm and the thickness of the first and second porous layers 32 and 35 made of glass wool being 50 mm) Further, the power level of the exhaust device in which the first low-frequency sound absorbing material 3a is laminated on the inner surface side of the hood body 2 with the first porous body layer 32 facing the inner surface side of the hood body 2 is arranged. Show. The noise level was measured in accordance with JIS A 1409: 1998 “Measurement method of sound absorption coefficient of reverberation chamber” in the same manner as described above.

  From the figure, the exhaust system in the present embodiment shows a superior difference of about 5 dB in the sound absorption characteristics of 200 Hz, which is the dominant noise in the living room, compared with the comparative example, and the exhaust system in the present invention is an extremely effective noise prevention measure. It turns out to be effective.

  Accordingly, if the sound absorbing hood ha is used, noise can be absorbed more efficiently than the above-described exhaust device.

  The present invention can be changed and modified as follows within the scope of the claims.

  First, in the above-described embodiment, the case where silicone rubber is used as the film is described. However, instead of silicone rubber, natural rubber, isoprene rubber, styrene butadiene rubber, butadiene rubber, nitrile butadiene rubber, butyl rubber are used. Any rubber selected from ethylene propylene rubber, fluorine rubber, chlorosulfonated polyethylene rubber, chlorinated polyethylene rubber, epichlorohydrin rubber, polysulfide rubber, and polyolefin may be used.

  Secondly, in the above-described embodiment, the case where the film 31 is integrated with at least one of the first and second porous body layers 32 and 35 by means such as adhesion or silicone graft reaction is described. However, the film 31 and / or the first and second porous body layers 32 and 35 are heated to soften the film 31 and / or the first and second porous body layers 32 and 35 (for example, , 80 ° C.), both can be integrated by applying some pressure.

  Thirdly, in the above-described embodiment, the case where the present invention is applied to an outdoor unit of a gas heat pump (GHP) or an outdoor unit of a home air conditioner has been described. You may apply.

  Fourthly, in the above-described embodiment, the case where the first and second low-frequency sound absorbing materials are used is described. However, other sound absorbing materials, for example, a foam layer and a back side of the foam layer are provided. You may use the sound-absorbing material which consists of a porous body layer laminated | stacked.

Fifth, in the above-mentioned embodiment, the combustion heat generation amount and the combustion heat generation rate of the film constituting the low-frequency sound absorption material are described. However, the heat generation amount of the sound absorption material itself is 8 MJ / m ² or less, the combustion heat generation rate. [200 kW / m ² ] · 10 sec or less.

  Sixthly, in the above-described embodiment, the hood that forms the fluid flow path, the exhaust device that includes the sound absorber disposed at a position facing the air outlet of the hood and spaced from the hood, the hood, and the sound absorber Although the exhaust device in which another sound absorber is laminated on the inner surface of the hood is described, the present invention is not limited to the exhaust device having such a configuration. For example, the sound absorber (facing the air outlet of the hood) The first low-frequency sound-absorbing material 3a or the second low-frequency sound-absorbing material 3a described above is simply formed on the inner surface of the hood H or h that forms a fluid flow path. You may use the exhaust apparatus of the structure which affixed the low frequency sound-absorbing material 3b with the 1st porous body layer 32 facing the inner surface side of the hoods H and h.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of an exhaust device according to a first embodiment of the present invention. FIG. 1A is a perspective view of the exhaust device, FIG. 2B is an exploded perspective view of the exhaust device, and FIG. Sectional drawing of the exhaust apparatus. Sectional drawing which shows the Example of the low frequency sound absorption material (1st low frequency sound absorption material) as a sound absorber of this invention. Explanatory drawing which shows the mixing ratio of the silicone rubber and a filler in the low frequency sound absorption material (1st low frequency sound absorption material) of this invention. Explanatory drawing which shows the sound absorption characteristic of the low frequency sound absorption material (1st low frequency sound absorption material) of this invention. Explanatory drawing which shows the relationship between the power level and frequency of the exhaust apparatus in the 1st Embodiment of this invention. Sectional drawing of the film-form sound absorption structure which uses the low frequency sound absorption material (1st low frequency sound absorption material) of this invention. Sectional drawing which shows the Example of the sound absorber using the other low frequency sound-absorbing material (2nd low frequency sound-absorbing material) of this invention. Explanatory drawing which shows the sound absorption characteristic of the other low frequency sound-absorbing material (2nd low frequency sound-absorbing material) of this invention. Explanatory drawing which shows the relationship between the power level and frequency of the exhaust apparatus which uses the 2nd low frequency sound-absorbing material of this invention. Sectional drawing of the film-form sound absorption structure using the 2nd low frequency sound-absorbing material of this invention. Sectional drawing of the exhaust apparatus which uses the other hood of this invention. Explanatory drawing which shows the relationship between the power level and frequency of the exhaust apparatus which uses the other hood of this invention. Sectional drawing of the exhaust apparatus in the other embodiment of this invention. Explanatory drawing which shows the relationship between the power level and frequency of the exhaust apparatus in the other embodiment of this invention. Sectional drawing of the exhaust apparatus in the other embodiment of this invention. Explanatory drawing which shows the relationship between the power level and frequency of the exhaust apparatus in the other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Outdoor unit 11 ... Intake port H ... Hood 2 ... Hood main body 21 ... Roof member 22a, 22b ... Side wall member 23 ... Opening part 24 ... Air outlet 3 ... Sound absorber 3a ... First low frequency sound absorbing material 3b ... Second low frequency sound absorbing material 31 ... Film made of silicone rubber 32 ... Porous body layer (first porous layer Body layer)
35 ... porous body layer (second porous body layer)
4 ... Floor 6 ... Ceiling

Claims (19)

  An exhaust system comprising: a hood that forms a fluid flow path; and a sound absorber disposed at a position facing the air outlet of the hood and spaced apart from the hood. A hood that forms a fluid flow path; and a sound absorber that is spaced apart from the hood at a position facing the air outlet of the hood,
An exhaust system, wherein another sound absorbing body is laminated on the inner surface of the hood.     The exhaust device according to claim 1 or 2, wherein the sound absorber and / or the other sound absorber includes a low-frequency sound absorber.     The exhaust device according to claim 3, wherein the low-frequency sound absorbing material includes a film made of rubber and a porous body layer laminated on a surface opposite to the sound source side of the film.   The low-frequency sound absorbing material includes a film made of rubber, a porous body layer laminated on a surface opposite to the sound source side of the film, and another porous body layer laminated on a sound source side surface of the film The exhaust apparatus according to claim 3, further comprising:   6. The sound absorbing material according to claim 4, wherein the rubber is made of silicone rubber. The sound absorption material according to any one of claims 4 to 6, wherein a combustion heat generation amount of the film is 8 MJ / m ² or less. The sound absorption material according to any one of claims 4 to 7, wherein a combustion heat generation rate of the film is [200 kW / m ² ] · 10 sec or less.   The rubber is natural rubber, isoprene rubber, styrene butadiene rubber, butadiene rubber, nitrile butadiene rubber, butyl rubber, ethylene propylene rubber, fluorine rubber, chlorosulfonated polyethylene rubber, chlorinated polyethylene rubber, epichlorohydrin rubber, polysulfide rubber, The sound-absorbing material according to claim 4 or 5, comprising any rubber selected from polyolefins.   The sound absorbing material according to claim 4, wherein the film includes an inorganic compound.   11. The inorganic compound comprises a compound containing any one of Si, Ca, Sr, and Ba or a mixture of compounds containing any one of Si, Ca, Sr, and Ba. Sound absorbing material.   The sound absorbing material according to any one of claims 4 to 11, wherein the porous body layer is formed of a flame retardant material.   The sound absorbing material according to any one of claims 4 to 12, wherein the porous layer is made of glass wool, rock wool, or a mixture thereof.   The sound absorbing material according to claim 4, wherein the film is integrated with the porous body layer.   The sound absorbing material according to any one of claims 5 to 13, wherein the film is integrated with one of the porous body layer and the other porous body layer.   16. The sound absorbing material according to claim 14, wherein the film is integrated with the porous body layer and / or the other porous body layer by adhesion.   16. The sound absorbing material according to claim 14, wherein the film is integrated with the porous body layer and / or the other porous body layer by heat fusion.   16. The sound absorbing material according to claim 14, wherein the film is integrated with the porous body layer and / or the other porous body layer by a silicone graft reaction. The membrane is integrated with the porous body layer and / or the other porous body layer by allowing a part of the membrane to enter the pores of the porous body layer and / or the other porous body layer. 16. The sound absorbing material according to claim 14, wherein the sound absorbing material is provided.

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