JP3554597B2 - Noise suppression device for combustion equipment - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a noise suppression device used for a combustion device.
[0002]
[Prior art]
In a general gas combustion device for hot water supply, when a combination of factors such as the thickness and length of a chimney, the volume of a housing, and the combustion characteristics of a burner satisfies resonance conditions, resonance of combustion noise occurs, and large low-frequency Noise is generated. In order to prevent this noise generation, Japanese Utility Model Laid-Open No. 5-45438 has a resonance box. This resonance box is intended to prevent the resonance of the combustion noise by receiving and absorbing the combustion noise through the pressure wave transmission passage, and to reduce the noise.
[0003]
[Problems to be solved by the invention]
The combustion device disclosed in the above publication cannot absorb frequency components in a wide band of combustion noise. For example, when the length of the chimney is significantly changed as compared with a predetermined length, resonance of a certain frequency component may occur. Could occur.
On the other hand, in order to prevent the combustion noise from leaking to the outside through the front wall of the housing, a shielding plate is provided on the rear side of the housing, and the combustion noise is shielded by the shielding plate. However, the combustion noise may be reflected by the shielding plate and leak from the other direction to the outside, and it has been required to reduce the leakage of the combustion noise.
[0004]
[Means for Solving the Problems]
Claim 1 In the noise suppression device for a combustion device according to the invention, a vibration sheet is disposed in a space connected to an exhaust passage of the combustion device, the vibration sheet includes a heat-resistant resin layer, and the heat-resistant resin layer is directly connected to the exhaust passage. It is characterized by confrontation.
Claim 2 In the noise suppression device for a combustion device according to the invention, a vibration sheet is disposed in a space connected to an exhaust passage of the combustion device, the vibration sheet includes a heat-resistant resin layer and a rubber layer, and the rubber layer is a heat-resistant resin. It is characterized in that it is arranged outside the layer, that is, on the side opposite to the exhaust passage.
Claim 3 In the noise suppression device for the combustion device according to the invention of the invention, A vibration sheet is provided in a space connected to an exhaust passage of the combustion device, and a partition wall is provided between the exhaust passage and a space in which the vibration sheet is provided, and the space is connected to the exhaust gas through a pressure wave transmission passage. Connecting to the aisle, A heat insulating sheet is provided on the partition wall.
Claim 4 In the invention of the claim, 3 In the noise suppression device for a combustion device according to the above, a heat equalizing plate having an opening is disposed between the partition wall and the vibration sheet.
[0005]
Claim 5 In the noise suppression device for the combustion device according to the invention of the invention, A vibration sheet is arranged in a space connected to the exhaust passage of the combustion device, The combustion device includes a burner, a heat exchanger disposed above the burner, a housing that houses the burner and the heat exchanger, and a chimney connected to an exhaust port of the housing. The space where the sheets are arranged should be connected to the exhaust passage downstream of the heat exchanger. Feature .
Claim In the invention of the sixth aspect, Claim 5 In the noise prevention device for a combustion device, a partition wall is disposed between the exhaust passage and the space in which the vibration sheet is disposed, and a pressure wave transmission passage is formed in the partition wall. I do.
Claim 7 Claim of the invention 5 In the noise suppression device for a combustion device of the above, the chimney is attached to the exhaust port via an attachment box, and an internal space in the attachment box is provided with a first chamber constituting a part of the exhaust passage. And a second chamber as a space for disposing the vibrating sheet.
Claim 8 In the invention of the claim, 7 Noise suppression device for a combustion device of the above, The first room and the second room are separated by a partition wall. The partition wall extends in a direction intersecting with the pair of side walls of the attachment box having a substantially rectangular parallelepiped shape, and a main wall portion whose both ends are separated from the side walls, and extends along both sides of the attachment box from both ends of the main wall portion. An opening formed in these auxiliary wall portions, a gap between the auxiliary wall portion and a side wall of the attachment box is provided as the pressure wave transmission passage, and the vibration sheet is provided with a pair of auxiliary wall portions. It is characterized by being disposed so as to be spaced apart from the main wall portion.
Claim 9 In the invention of the claim, 7 Noise suppression device for a combustion device of the above, The first room and the second room are separated by a partition wall. The partition wall has a pair of main wall portions extending in a direction intersecting the front wall of the attachment box and facing each other, and an auxiliary wall portion extending along the front wall of the attachment box by connecting one end of the main wall portion to each other. An opening formed in the auxiliary wall portion and a gap between the auxiliary wall portion and the front wall of the attachment box are provided as the pressure wave transmission passage, and the pair of vibrating sheets are spaced apart from the main wall portion. It is characterized by being arranged with.
[0006]
Claim 10 In the invention of the claim, 7 In the noise suppression device for a combustion device of the above, the attachment box is installed in an exhaust port formed on the front side of the housing, The first room and the second room are separated by a partition wall. The partition wall has a main wall portion substantially parallel to the front wall of the housing, an auxiliary wall portion substantially parallel to the bottom wall of the attachment box, an opening formed in the auxiliary wall portion, an auxiliary wall portion and the attachment. A gap between the bottom wall of the box and the bottom wall of the box is provided as the pressure wave transmission passage, and the vibration sheet is disposed so as to be spaced apart from the main wall portion.
Claim 11 In the invention of the claim, 7 In the noise suppression device for a combustion device of the above, the attachment box is installed in an exhaust port formed on the front side of the housing, The first room and the second room are separated by a partition wall. The partition wall has a main wall portion that extends substantially horizontally and is disposed below the exhaust port, and an auxiliary wall portion that is substantially parallel to at least one of a front wall and a pair of side walls of the attachment box. An opening formed in the wall portion, a gap between the auxiliary wall portion and the front wall or the side wall of the attachment box facing the auxiliary wall portion is provided as the pressure wave transmission passage, and the vibration sheet is provided below the main wall portion. It is characterized in that it is arranged facing away from the main wall.
Claim 12 In the invention of the claim, 7 ~ 11 In the noise prevention device for a combustion device, a protective cover is provided outside the vibrating sheet to cover the vibrating sheet, and the protective cover has an opening communicating with outside air. I do.
[0007]
[Action]
Claim 1 According to the invention, since the vibration sheet has the resin layer, the vibration sheet can be vibrated in a relatively wide frequency band to convert the combustion noise into heat energy, thereby favorably absorbing the combustion noise, and reducing the noise. Moreover, since the heat-resistant resin layer directly faces the exhaust passage, the combustion noise transmitted through the exhaust passage can be absorbed with a simple configuration.
Claim 2 According to the invention, even when the vibration sheet is arranged in the exhaust passage, the heat resistance can be effectively utilized by disposing the heat-resistant resin layer on the high temperature side, and the rubber layer is arranged on the low temperature side. A very good sound absorbing effect can be maintained for a long time without deterioration.
Claim 3 According to the invention, since the heat insulating sheet is provided on the partition wall, the heat received by the vibration sheet can be reduced, and the deterioration of the resin layer can be more reliably suppressed.
Claim 4 According to the invention, the temperature of the exhaust gas transmitted to the vibrating sheet can be equalized by the heat equalizing plate, and the vibrating sheet is not locally exposed to a high temperature, so that local deterioration can be prevented.
[0008]
Claim 5 According to the invention, even if the length of the chimney is significantly changed, for example, the resonance of the combustion noise, that is, the noise can be reliably eliminated by the vibration sound absorption by the vibration sheet having the resin layer.
Claim 6 Since the partition wall is provided between the chamber in which the vibration sheet is disposed and the exhaust passage, the vibration sheet does not receive the exhaust heat entirely. For this reason, even if the vibration sheet has a resin layer, its deterioration can be suppressed.
Claim 7 According to the invention, the chamber for disposing the vibrating sheet is formed in the attachment box, and the noise suppression device can be obtained at a low cost with a relatively simple configuration without changing the structure in the housing of the combustion device or the structure of the chimney. be able to.
Claim 8 According to the invention, the sound wave, that is, the pressure wave, is transmitted through the gap between the pair of auxiliary wall portions of the partition wall and the pair of side walls of the attachment box. Exhaust heat is radiated to the outside from the pair of side walls of the attachment box, and the deterioration of the vibration sheet can be further suppressed.
Claim 9 According to the invention, the sound wave is transmitted through the gap between the auxiliary wall portion of the partition wall and the front wall of the attachment box. Exhaust heat is radiated from the front wall of the attachment box to the outside, so that deterioration of the vibration sheet can be further suppressed. In addition, since a pair of vibration sheets is provided, the noise prevention function can be enhanced.
[0009]
Claim 10 According to the invention, the sound wave is transmitted through the gap between the auxiliary wall portion of the partition wall and the bottom wall of the attachment box. The heat of the exhaust gas is radiated to the outside from the bottom wall of the attachment box, and the deterioration of the vibration sheet can be further suppressed.
Claim 11 According to the invention, the sound wave is transmitted through the gap between the auxiliary wall portion of the partition wall and the front wall or the side wall of the attachment box facing the auxiliary wall portion. The heat of the exhaust gas is radiated to the outside from the front wall or the side wall of the attachment box, and the deterioration of the vibration sheet can be further suppressed. Further, since the vibration sheet is disposed below the exhaust port, the heat of the exhaust gas is not easily transmitted, and the deterioration of the vibration sheet can be suppressed from this point as well.
Claim 12 According to the invention, the vibration sheet can be protected by the protective cover. Since the protective cover has an opening communicating with the outside air, the vibration of the vibrating sheet can be smoothly performed. Further, the temperature of the vibrating sheet can be lowered by contact with the outside air, and from this point, the deterioration of the vibrating sheet can be suppressed.
[0010]
【Example】
1 and 2 show a first embodiment of the present invention. The combustion device shown in the figure is of an outdoor installation type and includes a housing 10. The housing 10 includes a housing body 11 and a front cover 12 (a front wall of the housing). Inside the housing 10, a fan (not shown), a gas burner 13, and a heat exchanger 14 are accommodated in order from the bottom. An exhaust port 15 is formed on the upper wall of the housing 10, and an exhaust chamber 16 a forming a part of an exhaust passage 16 is formed between the exhaust port 15 and the heat exchanger 14.
[0011]
A chimney 18 is connected to the exhaust port 15 via a metal attachment box 20. The internal space 16 b of the chimney 18 forms a main part of the exhaust passage 16.
[0012]
As shown in FIGS. 1 and 2, the attachment box 20 includes a box body 21 having an open front side, and a protective cover 28 (a front wall of the attachment box) covering the opening of the box body 21. It has a shape. The box body 21 includes a pair of side walls 22, a back wall 23, an upper wall 24, and a bottom wall 25. The bottom wall 25 has a tubular portion 25a connected to the exhaust port 15 of the housing 10, and the top wall 24 has a tubular portion 24a connected to the lower end of the chimney 18.
[0013]
In the attachment box 20, a partition wall 30 having a U-shaped planar shape is accommodated. The partition wall 30 divides the internal space of the attachment box 20 into a first chamber 16x and a second chamber 35. The first chamber 16x becomes a part of the exhaust passage 16. The partition wall 30 is parallel to the cover 28 and extends perpendicular to the side wall 22. Both ends of the partition wall 30 are separated from the side wall 22, and the partition wall 30 is connected to both ends of the main wall portion 31 and is parallel to the side wall 22 to the back wall 23. And a pair of auxiliary wall portions 32 extending. Each auxiliary wall portion 32 has an opening 32a formed at a position near the back wall 23. A gap 33 is formed between the auxiliary wall portion 32 and the side wall 22. As a result, the second chamber 35 is connected to the first chamber 16x via the opening 32a and the gap 33 of the auxiliary wall portion 32 serving as a pressure wave transmission passage.
[0014]
In the second chamber 35, a vibration sheet 40 is provided between the main wall portion 31 of the partition wall 30 and the protective cover 28 so as to be parallel to and separated from each other. The vibration sheet 40 is formed of a single rubber sheet (rubber layer, resin layer) made of foamed silicone resin, fluorine-based rubber, or the like. The periphery of the vibration sheet 40 is supported by being sandwiched between a flange 21a formed on the periphery of the front opening of the box body 21 and an elongated pressing plate 41 fixed to the flange 21a with screws or the like. Thus, the vibration sheet 40 closes the opening of the box body 21.
[0015]
A heat insulating sheet 45 is attached to the inner and outer surfaces of the main wall portion 31 and the auxiliary wall portion 32 of the partition wall 30. In the second chamber 35, a metal heat equalizing plate 46 is arranged between the main wall portion 31 of the partition wall 30 and the vibration sheet 40. The heat equalizing plate 46 is spaced apart from the main wall portion 31 and the vibration sheet 40 in parallel. The heat equalizing plate 46 has a large number of openings 46a. The protective cover 28 has an opening 28a connected to the outside air.
[0016]
In the above configuration, the heat exchanger 14 is heated by the heat of combustion in the gas burner 13. A tube is wound around the heat exchanger 14, and water passing through the tube is heated by the heat exchanger 14 to become hot water. The flue gas is discharged to the outside through the heat exchanger 14, through the exhaust chamber 16a, the first chamber 16x of the attachment box 20, and the internal space 16b of the chimney 18.
[0017]
In the gas burner 13, a sound is generated in accordance with the combustion. If the combustion device is configured to satisfy the resonance condition, the combustion noise may resonate and cause a very large noise. This resonance condition is satisfied, for example, when the chimney 18 reaches a certain length. Since the length of the chimney 18 is appropriately adjusted according to the installation location of the combustion device, there is a possibility that the resonance condition may be satisfied. However, the pressure wave of the combustion sound, that is, the sound wave, is transmitted from the first chamber 16x to the vibration sheet through the opening 32a of the auxiliary wall portion 32 and the gap 33 between the auxiliary wall portion 32 and the side wall 22 in the attachment box 20. And transmitted to the vibration sheet 40. Since the vibration sheet 40 is made of rubber, the vibration sheet 40 absorbs the entire frequency band of 1 KHz or less, and particularly absorbs the low frequency region of 200 Hz or less over the entire region. This absorption function is much better than other materials, such as metal sheets. Therefore, even if the length of the chimney 18 is largely changed, noise associated with resonance in a low frequency region can be reliably prevented. Since the opening 28a is formed in the protective cover 28, the space between the protective cover 28 and the vibration sheet 40 does not become a closed space, and does not hinder the vibration absorbing function of the vibration sheet 40.
[0018]
The exhaust gas passing through the first chamber 16x of the attachment box 20 has a much lower temperature (200 to 260 ° C.) as compared with the upstream side of the heat exchanger 14, but deteriorates when the rubber vibration sheet 40 is touched as it is. there is a possibility. The function for suppressing this deterioration will be described in detail. Since the first chamber 16x and the second chamber 35 are partitioned by the partition wall 30, it is possible to prevent the vibration sheet 40 from being entirely exposed to the exhaust gas. Since the heat insulating sheet 45 is provided on the partition wall 30, the heat received by the vibration sheet 40 can be further reduced. The opening 32a and the narrow gap 33 of the auxiliary wall portion 32 serving as the pressure wave transmission passage also serve as a passage for exhaust heat. Since the exhaust heat is radiated by the side wall 22, the exhaust heat is disposed in the second chamber 35. High heat can be prevented from being transmitted to the vibrating sheet 40. Further, since the exhaust heat is equalized by the heat equalizing plate 46, it is possible to prevent the vibration sheet 40 from being locally heated. Further, the opening 28a is formed in the protective cover 28, and the outside air enters between the protective cover 28 and the vibration sheet 40, so that the vibration sheet 40 can be maintained at a relatively low temperature from this point as well. In this way, the temperature of the vibration sheet 40 can be reduced to, for example, about 100 to 200 ° C., and the deterioration of the vibration sheet 40 can be suppressed.
[0019]
Since the vibration sheet 40 closes the opening of the box body 21, it is possible to prevent the exhaust gas from leaking from the attachment box 20.
[0020]
Next, another embodiment of the present invention will be described. In these embodiments, components corresponding to those of the preceding embodiment are denoted by the same reference numerals in the drawings, and detailed description thereof will be omitted.
In the second embodiment shown in FIG. 3, a plurality of openings 32 a serving as pressure wave transmission passages are formed in the auxiliary wall portion 32. Other configurations are the same as those of the first embodiment.
In the third embodiment shown in FIG. 4, the side wall 22 of the attachment box 20 is corrugated, thereby increasing the heat radiation area to enhance the heat radiation effect. It can be further reduced. Other configurations are the same as those of the first embodiment.
[0021]
In the fourth embodiment shown in FIG. 5, the end of the auxiliary wall portion 32 of the partition wall 30 is separated from the back wall 23 of the attachment box 20, and an opening 32a is formed therebetween. The opening 32a can be recognized as being formed in the auxiliary wall portion 32 near the back wall 23. In this embodiment, a pair of second partition walls 38 are arranged inside the auxiliary wall portion 32, and the partition walls 38 are also provided with a heat insulating sheet 45. Since the pressure wave transmission path is lengthened by the gap 39 between the second partition wall 38 and the auxiliary wall portion 32, the influence of heat on the vibration sheet 40 can be further reduced.
[0022]
In the fifth embodiment shown in FIG. 6, the attachment box 20 includes a box body 21A that is open on both sides and a pair of protective covers 22A (side walls of the attachment box 20) that close the opening of the box body 21A. The box body 21A has a front wall 28A, a back wall 23, an upper wall and a bottom wall. An opening 22a is formed in the protective cover 22A. The partition wall 30A has a U-shape in plan view, and includes a pair of main wall portions 31A orthogonal to the front wall 28A of the attachment box 20A and extending in parallel with the protective cover 22A. It has an auxiliary wall portion 32A extending along the front wall 28A of the 20A. An opening 32a is formed in the center of the auxiliary wall portion 32A. A gap 33A is formed between the auxiliary wall portion 32A and the front wall 28A of the attachment box 20. The opening 32a and the gap 33A are provided as a pressure wave transmission passage.
[0023]
In the fifth embodiment, a pair of second chambers 35 are formed on both sides of the attachment box 20. In each of the second chambers 35, a heat equalizing plate 46 and a vibrating sheet 40 are arranged so as to be separated from and opposed to the main wall portion 31A. In this embodiment, the front wall 28A plays a role of heat radiation. By providing the pair of vibration sheets 40, the noise prevention effect can be further enhanced. In this embodiment, the left and right sound absorbing characteristics are the same, but the left and right sound absorbing characteristics are changed by making the volumes of the pair of second chambers 35 different from each other or by making the thickness of the pair of vibrating sheets 40 different from each other. They may be different from each other.
[0024]
The first to fifth embodiments described above can be applied to the case where the attachment box 20 is installed in a different manner. For example, as shown in FIG. 7A, the chimney 18 may be connected to the back wall of the attachment box 20. Further, the attachment box 20 may be set in an exhaust port provided in the front cover 12 of the housing 10.
[0025]
In the installation mode of the attachment box 20 as shown in FIG. 7B, the structures of the sixth to eighth embodiments can be further adopted.
In the sixth embodiment shown in FIGS. 8 and 9, the basic structure of the attachment box 20, and the arrangement of the vibration sheet 40 and the heat equalizing plate 46 are the same as those in the first embodiment. The differences are as follows. A tubular portion 23 a is formed on a back wall 23 of the attachment box 20, and the tubular portion 23 a is connected to an exhaust port 15 provided in the front cover 12. The exhaust port 15 is connected to the front side of the exhaust chamber 16a (see FIG. 1). The partition wall 30B has a main wall portion 31B parallel to the front cover 12 and the protective cover 28, and a U-shaped auxiliary wall portion 32B as viewed from the front. The auxiliary wall portion 32B is a portion 32B parallel to the bottom wall 25 of the attachment box 20. ₁ And a portion 32B parallel to the pair of side walls 22 ₂ And These parts 32B ₁ , 32B ₂ Are formed with openings 32a near the back wall 23, respectively. Also, the bottom wall 25 and the portion 32B ₁ 33B between ₁ Is formed, and the side wall 22 and the portion 32B are formed. ₂ 33B between ₂ Is formed. The second chamber 35 is formed between the protective cover 28 and the main wall portion 31B of the partition wall 30B, and has the opening 32a and the gap 33B. ₁ , 33B ₂ Is provided as a pressure wave transmission passage connecting the first chamber 16x and the second chamber 35.
[0026]
In the sixth embodiment, the pair of side walls 22 and the bottom wall 25 play a role of heat radiation. In this embodiment, an opening 28a is formed at the bottom of the protective cover 28 to prevent rain from entering.
The auxiliary wall portion 32B is a portion 32B along the bottom wall 25. ₁ It may be constituted only by. In this case, the pressure wave is generated by the gap 33B. ₁ Through the vibration sheet 40.
[0027]
In the seventh embodiment shown in FIGS. 10 and 11, the attachment box 20C includes a box body 21C having an open bottom, and a protective cover 25C covering the opening. The protection cover 25C has an opening 25a communicating with the outside air. The box main body 21C has a front wall 28C, a back wall 23, an upper wall 24, and a pair of side walls 22. The partition wall 30C has a main wall portion 31C that extends horizontally perpendicular to the front cover 12 and that is disposed below the exhaust port 15, and an auxiliary wall portion 32C that has a U-shaped plane. The auxiliary wall portion 32C is a portion 32C parallel to the front wall 25 of the attachment box 20. ₁ And a portion 32C parallel to the pair of side walls 22 ₂ And These parts 32C ₁ , 32C ₂ An opening 32a is formed in the upper part of the. Also, the front wall 28C and the portion 32C ₁ 33C between ₁ Is formed, and the side wall 22 and the portion 32C are formed. ₂ 33C between ₂ Is formed. The second chamber 35 is formed at the bottom of the attachment box 20C between the protective cover 25C and the main wall portion 31C of the partition wall 30C. The opening 32a and the gap 33C ₁ , 33C ₂ Is provided as a pressure wave transmission passage connecting the first chamber 16x and the second chamber 35.
[0028]
In the seventh embodiment, the pair of side walls 22 and the front wall 28C play a role of heat radiation. Since the second chamber 35 is below the exhaust port 15, the exhaust heat is not easily transmitted to the vibration sheet 40, and the deterioration of the vibration sheet 40 can be suppressed from this point as well.
The auxiliary wall portion 32C is a portion 32C along the front wall 28C. ₁ Or a portion 32C along the side wall 22. ₂ It may be constituted only by.
[0029]
In the eighth embodiment shown in FIG. 12, the partition wall 30C has a flat plate shape and is disposed below the exhaust port 15, and an opening 32a is formed in the partition wall 30C. Other configurations are the same as those of the above-described seventh embodiment.
In the first to eighth embodiments, the protective cover may be omitted.
[0030]
In the ninth embodiment shown in FIG. 13, a casing 50 is connected to the peripheral wall of the chimney 18. The space in the casing 50 is provided as a chamber 35 connected to the internal space 16b of the chimney 18. In the chamber 35, the partition wall 30 provided with the heat insulating sheet 45, the heat equalizing plate 46, and the vibration sheet 40 are arranged in the order away from the chimney 18. A pressure wave transmission passage 32 a is formed in the partition wall 30, and an opening (not shown) is formed in the protective cover 51 that covers the vibration sheet 40. The detailed structure of the ninth embodiment may be the same as that of the first to eighth embodiments.
[0031]
In the tenth embodiment shown in FIG. 14, a partition wall 30 provided with a heat insulating sheet 45, a heat equalizing plate 46, and a vibration sheet 40 are arranged in this order at the front end of the exhaust chamber 16a. . A pressure wave transmission passage 32a is formed in the partition wall 30.
[0032]
In the eleventh embodiment shown in FIG. 15, an exhaust port is formed in the front cover 12. A chamber 35 is formed in the upper part of the housing 10 and communicates with the upper part of the exhaust chamber 16a. In the chamber 35, the partition wall 30 provided with the heat insulating sheet 45, the heat equalizing plate 46, and the vibration sheet 40 are arranged in order from the bottom. A pressure wave transmission passage 32a is formed in the partition wall 30.
[0033]
In the twelfth embodiment shown in FIG. 16, an exhaust top 19 is attached to the front cover 12 of the housing 10, and combustion exhaust gas is discharged from both ends of the exhaust top. A vibration sheet 40 is arranged in the exhaust top 19. The vibration sheet 40 faces the exhaust port of the front cover 12 and directly receives the combustion exhaust gas. Therefore, it is preferable that the vibration sheet 40 be formed of a heat-resistant resin sheet instead of a rubber sheet as described later.
[0034]
In the thirteenth embodiment shown in FIG. 17, for example, a rubber vibration sheet 40 is disposed at a place not related to the exhaust passage but at the back side of the front cover 12, away from the front cover 12. ing. The four sides of the vibration sheet 40 are fixed to the front cover 12 with brackets (not shown) or the like. In this embodiment, of the combustion noise of the burner, the combustion noise toward the front cover 12 is absorbed by the vibration of the vibration sheet 40.
[0035]
FIGS. 18A and 18B show a vibration sheet 40 used in place of the rubber sheet alone in all the above-described embodiments.
In FIG. 18A, the vibration sheet 40 is composed of a single heat-resistant resin sheet (resin layer) made of polytetrafluoroethylene. Although the vibration sheet 40 made of polytetrafluoroethylene has an inferior absorption function in a wide frequency band as compared with a rubber sheet, it still has a better absorption function than a thin metal plate or the like. Further, since it has heat resistance, there is no fear of deterioration even when it comes into contact with the combustion exhaust gas, and the cold resistance is good. In consideration of this heat resistance, in all the embodiments in which the vibration sheet 40 is arranged in the exhaust passage, the heat insulating sheet can be omitted, or the partition wall, the heat insulating sheet, and the heat equalizing sheet can be omitted to directly connect to the exhaust passage. You can also confront them. As the heat-resistant resin sheet, in addition to non-porous polytetrafluoroethylene, stretched porous polytetrafluoroethylene may be used, or another material may be used.
[0036]
In FIG. 18B, the vibration sheet 40 is configured by laminating a heat-resistant resin sheet 40A (heat-resistant resin layer) such as polytetrafluoroethylene and a rubber sheet 40B (rubber layer). ing. These sheets 40A and 40B may be bonded to each other with an adhesive or the like, or may be simply laminated without bonding. In the vibration sheet 40 of this embodiment, the resin sheet 40A faces the exhaust passage side, and the rubber sheet 40B faces the outside. This makes it possible to make use of the heat resistance of the resin sheet 40A. When applied to the above-described embodiment, some or all of the partition wall, the heat insulating sheet, and the heat equalizing plate can be omitted.
[0037]
In FIG. 18 (C), the heat-resistant resin sheet 40A and the rubber sheet 40B are disposed apart from each other with a spacer 42 interposed therebetween. Even with such a configuration, substantially the same operation and effect as those in FIG. 18B can be obtained.
[0038]
In the vibration sheet 40 of FIG. 18D, a rubber sheet 40B is interposed between two heat-resistant resin sheets 40A, and the rubber sheet 40B is protected from cold outside.
[0039]
In the vibration sheet 40 shown in FIG. 18E, a rubber sheet 40B is laminated outside the thin metal plate 40C. In this embodiment, the vibration absorbing ability of the rubber sheet 40B can be utilized while utilizing the mechanical strength and heat resistance of the thin metal plate 40C. The heat-resistant resin sheet 40 </ b> A may be laminated inside the thin metal plate 40.
[0040]
In all the embodiments using the above-mentioned partition wall, the heat insulating sheet may be omitted by forming the partition wall itself with a heat insulating material.
Further, for example, a box similar to the attachment box with the noise suppression device of the first embodiment may be used at the end of the chimney, or the end of the chimney extending from the housing is connected to another additional chimney via this box. You may.
[0041]
【The invention's effect】
As explained above, the claims 1 According to the invention, since the vibration sheet has the resin layer, the combustion noise can be favorably absorbed and the noise can be reduced. Moreover, the combustion noise transmitted through the exhaust passage can be absorbed with a simple configuration.
Claim 2 According to the invention, even when the vibration sheet is arranged in the exhaust passage, the heat resistance can be effectively utilized by disposing the heat-resistant resin layer on the high temperature side, and the rubber layer is arranged on the low temperature side. A very good sound absorbing effect can be maintained for a long time without deterioration.
Claim 3 According to the invention, the heat received by the vibration sheet can be reduced, and the deterioration of the resin layer can be suppressed more reliably.
Claim 4 According to the invention, since the vibration sheet is not locally exposed to the high temperature, local deterioration can be prevented.
[0042]
Claim 5 According to the invention, even if the length of the chimney is greatly changed, for example, the resonance of the combustion noise, that is, the noise can be reliably eliminated.
Claim 6 According to the invention, even if the vibration sheet has the resin layer, the deterioration can be suppressed.
Claim 7 According to the invention, the noise prevention device can be obtained at a low cost with a relatively simple configuration without changing the structure in the housing of the combustion device or the structure of the chimney.
Claim 8 According to the invention, the exhaust heat is radiated to the outside from the pair of side walls of the attachment box, and the deterioration of the vibration sheet can be further suppressed.
Claim 9 According to the invention, the exhaust heat is radiated to the outside from the front wall of the attachment box, and the deterioration of the vibration sheet can be further suppressed. In addition, since a pair of vibration sheets is provided, the noise prevention function can be enhanced.
[0043]
Claim 10 According to the invention, the exhaust heat is radiated to the outside from the bottom wall of the attachment box, and the deterioration of the vibration sheet can be further suppressed.
Claim 11 According to the invention, the exhaust heat is radiated to the outside from the front wall or the side wall of the attachment box, and the deterioration of the vibration sheet can be further suppressed. Further, since the vibration sheet is disposed below the exhaust port, the deterioration of the vibration sheet can be suppressed from this point as well.
Claim 12 According to the invention, the vibration sheet can be protected by the protective cover. In addition, the vibration of the vibration sheet can be smoothly performed by the opening of the protective cover, and the temperature of the vibration sheet can be reduced to suppress the deterioration of the vibration sheet.
[Brief description of the drawings]
FIG. 1 is a side view showing a main part of a combustion device provided with a noise prevention device according to a first embodiment of the present invention in a longitudinal section.
FIG. 2 is a transverse sectional view taken along line II-II in FIG.
FIG. 3 is a view corresponding to FIG. 2 showing a second embodiment of the noise prevention device.
FIG. 4 is a view corresponding to FIG. 2 showing a third embodiment of the noise prevention device.
FIG. 5 is a diagram corresponding to FIG. 2 showing a fourth embodiment of the noise prevention device.
FIG. 6 is a diagram corresponding to FIG. 2, showing a fifth embodiment of the noise prevention device.
FIGS. 7A and 7B are side views respectively showing other installation modes of the attachment box in which the noise suppression devices of the first to fifth embodiments are incorporated.
FIG. 8 is a longitudinal sectional view showing a sixth embodiment of a noise prevention device suitable for the attachment mode of the attachment box shown in FIG. 7 (B).
FIG. 9 is a transverse sectional view taken along line IX-IX in FIG.
FIG. 10 is a longitudinal sectional view showing a seventh embodiment of a noise prevention device suitable for the installation mode of the attachment box shown in FIG. 7 (B).
FIG. 11 is a transverse sectional view taken along line XI-XI in FIG.
FIG. 12 is a longitudinal sectional view showing an eighth embodiment of a noise prevention device suitable for the attachment mode of the attachment box shown in FIG. 7 (B).
FIG. 13 is a longitudinal sectional view showing a schematic configuration of a ninth embodiment of a noise prevention device.
FIG. 14 is a longitudinal sectional view showing a schematic configuration of a tenth embodiment of the noise prevention device.
FIG. 15 is a longitudinal sectional view showing a schematic configuration of an eleventh embodiment of the noise prevention device.
16A and 16B show a twelfth embodiment of the noise prevention device, wherein FIG. 16A is a side view and FIG. 16B is a front view.
17A and 17B show a thirteenth embodiment of the noise prevention device, wherein FIG. 17A is a side view and FIG. 17B is a rear view of a front cover.
FIGS. 18A to 18E are enlarged cross-sectional views showing other different modes of the vibration sheet.
[Explanation of symbols]
10 ... Housing
12… Front cover (front wall of housing)
13 ... gas burner
14… heat exchanger
15 ... exhaust port
16… Exhaust passage
16a: Exhaust chamber (part of exhaust passage)
16b… Internal space of chimney (part of exhaust passage)
16x ... 1st room of attachment box (part of exhaust passage)
18… chimney
20… Attachment box
22… Side wall of attachment box
22A, 25C, 28 ... Protective cover
22a, 25a, 28a ... opening of protective cover
25… Bottom wall of attachment box
28A, 28C ... front wall of attachment box
30, 30A, 30B, 30C ... partition wall
31, 31A, 31B, 31C ... main wall portion
32, 32A, 32B, 32C ... auxiliary wall part
32a ... opening (pressure wave transmission passage)
33, 33A, 33B ₁ , 33B ₂ , 33C ₁ , 33C ₂ … Gap (pressure wave transmission passage)
35… Second room (space where vibration sheet is arranged)
40… vibrating sheet
40A ... heat-resistant resin sheet (heat-resistant resin layer)
40B ... rubber sheet (rubber layer)
40C ... metal sheet
45… insulation sheet
46… soaking plate
46a ... opening

Claims (12)

Vibrating sheet in a space communicating with the exhaust passage of the combustion device is disposed, the vibrating sheet comprises a heat-resistant resin layer, for the heat-resistant resin layer of the combustion apparatus, characterized in that to face directly into the exhaust passage Noise control device. A vibration sheet is disposed in a space connected to the exhaust passage of the combustion device, the vibration sheet includes a heat-resistant resin layer and a rubber layer, and the rubber layer is disposed outside the heat-resistant resin layer, that is, on the side opposite to the exhaust passage. A noise suppression device for a combustion device, characterized in that: A vibration sheet is provided in a space connected to an exhaust passage of the combustion device, and a partition wall is provided between the exhaust passage and a space in which the vibration sheet is provided, and the space is connected to the exhaust gas through a pressure wave transmission passage. A noise prevention device for a combustion device, wherein a heat insulating sheet is provided on the partition wall , which is connected to the passage . The noise suppression device for a combustion device according to claim 3 , wherein a heat equalizing plate having an opening is disposed between the partition wall and the vibration sheet. A vibration sheet is provided in a space that communicates with an exhaust passage of the combustion device . The combustion device includes a burner, a heat exchanger disposed above the burner, a housing that houses the burner and the heat exchanger, and a housing. And a chimney connected to the exhaust port of the combustion device, wherein the space in which the vibration sheet is disposed is connected to an exhaust passage downstream of the heat exchanger. 6. The combustion apparatus according to claim 5 , wherein a partition wall is disposed between the exhaust passage and the space in which the vibration sheet is disposed, and a pressure wave transmission path is formed in the partition wall. Noise control device. The chimney is attached to the exhaust port via an attachment box, and an internal space in the attachment box has a first chamber forming a part of the exhaust passage and a second chamber serving as a space for disposing the vibration sheet. 6. The noise suppression device for a combustion device according to claim 5 , wherein the device has two chambers. The first chamber and the second chamber are partitioned by a partition wall, and the partition wall extends in a direction intersecting a pair of side walls of the attachment box having a substantially rectangular parallelepiped shape, and both ends thereof are separated from a main wall portion separated from these side walls. A pair of auxiliary wall portions extending from both ends of the main wall portion along the side wall of the attachment box, and an opening formed in the auxiliary wall portion, and a gap between the auxiliary wall portion and the side wall of the attachment box. 8. The noise suppression device for a combustion device according to claim 7 , wherein the vibration sheet is provided as the pressure wave transmission passage, and the vibration sheet is disposed so as to be spaced apart from the main wall portion. The first chamber and the second chamber are partitioned by a partition wall, and the partition wall is formed by a pair of main wall portions extending in a direction intersecting the front wall of the attachment box and facing each other, and one end of the main wall portion. An auxiliary wall portion extending along the front wall of the attachment box is provided, and an opening formed in the auxiliary wall portion and a gap between the auxiliary wall portion and the front wall of the attachment box are formed by the pressure wave transmission passage. 8. The noise prevention device for a combustion device according to claim 7 , wherein the pair of vibrating sheets are disposed so as to be spaced apart from the main wall portion. The attachment box is installed at an exhaust port formed on the front side of the housing, and the first chamber and the second chamber are partitioned by a partition wall. The partition wall includes a main wall portion substantially parallel to the front wall of the housing. , An auxiliary wall portion substantially parallel to the bottom wall of the attachment box, and an opening formed in the auxiliary wall portion and a gap between the auxiliary wall portion and the bottom wall of the attachment box are formed by the pressure wave transmission path. The noise suppression device for a combustion device according to claim 7 , wherein the vibration sheet is provided so as to be spaced apart from the main wall portion. The attachment box is installed at an exhaust port formed on the front side of the housing, and the first chamber and the second chamber are partitioned by a partition wall. The partition wall extends substantially horizontally and is disposed below the exhaust port. A main wall portion, an auxiliary wall portion substantially parallel to at least one of a front wall and a pair of side walls of the attachment box, an opening formed in the auxiliary wall portion, and an auxiliary wall portion facing the auxiliary wall portion. A gap between the front wall or the side wall of the attachment box to be provided is provided as the pressure wave transmission passage, and the vibration sheet is disposed below the main wall portion so as to be separated from and facing the main wall portion. A noise suppressor for a combustion device according to claim 7 . On the outside of the vibrating sheet, and a protective cover is provided to cover the vibrating sheet, according to any one of claims 7 to 11, characterized in that opening communicating with the outside air is formed in the protective cover Noise control device for combustion equipment in the country.

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