JP7448398B2 - Silencer for combustion equipment - Google Patents

Description

The present invention relates to a silencer for a combustion device that is attached to a combustion device that burns combustion gas and discharges the combustion gas, and that reduces combustion noise of the combustion gas.

BACKGROUND ART Some water heaters and the like used in general homes, factories, etc. use a combustion device that exchanges heat by burning combustion gas. 2. Description of the Related Art Conventionally, various mufflers have been disclosed that are attached to combustion devices in order to reduce noise generated when combustion gas is combusted and when combustion exhaust gas is discharged.

For example, Patent Documents 1 and 2 disclose a box body having an inlet and an outlet for combustion gas, and a plurality of partition plates disposed inside the box body having openings, and a curved line from the inlet to the outlet. A silencer with a passageway has been proposed.
In addition, in the silencer described in Patent Document 1, the box body and the partition plate are formed of a sound-absorbing material, and the surface of the sound-absorbing material is lined with a steel plate or a perforated steel plate.
Further, in the silencer described in Patent Document 2, the case that constitutes the outer wall and the cylindrical exhaust passage member that constitutes the bent passage are partially formed from a metal plate having a plurality of through holes, and the case and A sound absorbing material formed into a plate shape, for example, by adding a thermosetting resin to rock wool as a binder, is filled between the sound absorbing material and the metal plate.

In the conventional silencer configured in this way, combustion gas can flow into the sound absorbing material through multiple holes formed in the steel plate (metal plate) in the bent passage, and the sound absorbing material can muffle the noise. effect can be obtained.

On the other hand, Patent Document 3 discloses a cylindrical sound-muffling cylinder part, a disc-shaped inflow side plate provided at one opening end of the muffling cylinder part, and a disc-shaped outflow side plate provided at the other opening end. A silencer made of rock wool has been proposed. Note that an exhaust outlet and an exhaust outlet are formed in the center of the outflow side plate, a center opening is formed in the center of the inflow side plate, and a plurality of side openings are formed around the center opening.
Since the silencer described in Patent Document 3 configured in this way is provided with an inflow side plate on the exhaust gas inflow side, a part of the sound waves of combustion sound is reflected by this inflow side plate. Further, the unreflected sound waves are propagated inside through the central opening and the side openings, and the sound waves resonate over a wide range of frequencies and are muffled.

Japanese Patent Application Publication No. 11-159739 Unexamined Japanese Patent Publication No. 2016-42007 JP2004-308988A

However, the silencers described in Patent Documents 1 and 2 are manufactured using a sound absorbing material and a steel plate, making assembly complicated.
Further, although the silencer described in Patent Document 3 is composed of three parts and has an extremely simple structure, the passage length of the combustion gas is short, so that a sufficient noise reduction effect cannot be obtained.

The present invention has been made in view of the above-mentioned situation, and an object of the present invention is to provide a muffler for a combustion device that has a simple structure and can improve the muffling effect.

The above object is achieved by the following (1) muffler for a combustion device according to the present invention.

(1) A silencer for a combustion device that is attached to a combustion device that burns fuel and discharges combustion gas, and reduces the combustion sound of the combustion gas,
Made of materials containing inorganic fibers,
a gas inlet into which combustion gas discharged from the combustion device is introduced; a gas outlet which discharges the combustion gas to the outside; a gas flow path which communicates the gas inlet and the gas outlet; A box body provided with a resonance chamber adjacent to at least a part of the wall constituting the gas flow path,
A hole is provided in the wall located between the gas flow path and the resonance chamber, and a hardened layer is provided on the surface of the gas flow path side in at least a part of the wall excluding the hole. A silencer for combustion equipment.

Further, the silencer for a combustion device of the present invention is preferably one of the following (2) to (7).

(2) The silencer for a combustion device according to (1), wherein the hole is composed of a plurality of holes having different diameters.

(3) The silencer for a combustion device according to (1) or (2), wherein the resonance chamber is provided at a position closer to the gas inlet than the gas outlet.

(4) The silencer for a combustion device according to (1) or (2), wherein a plurality of the resonance chambers are provided.

(5) A partition plate made of a material containing inorganic fibers and having an opening for bending the gas flow path is provided inside the box;
The silencer for a combustion device according to any one of (1) to (4), wherein a part of the box and the partition plate are integrally formed.

(6) The box body includes a resonance chamber member constituting the resonance chamber, a bottom member laminated on the resonance chamber member, and a frame member laminated on the bottom member,
The resonance chamber member is vessel-shaped with one side open,
The bottom member has the wall that covers the opening of the resonance chamber member,
The bottom member and the wall are integrally molded, and
The silencer for a combustion device according to (5), wherein the partition plate and the frame member are integrally molded.

(7) The box body is formed by laminating the resonance chamber member, the bottom member integrally molded with the wall, and the plurality of frame members integrally molded with the partition plate,
The noise reduction for a combustion device according to (6), wherein the meandering gas flow path is configured by providing the openings of the two adjacent partition plates at different positions in a plan view from the stacking direction. vessel.

According to the silencer for a combustion device of the present invention, it has a box body provided with a gas flow path and a resonance chamber adjacent to at least a part of a wall forming the gas flow path, and the wall has a hole. is provided, and a hardened layer is formed on the gas flow path side in the area excluding this hole, making it difficult for combustion noise that has entered the resonance chamber to return to the gas flow path side, improving the noise reduction effect with a simple structure. be able to. Furthermore, since the box body is made of a material containing inorganic fibers, it is possible to absorb sound throughout the gas flow path with a small number of parts. Therefore, an excellent sound deadening effect can be obtained.

Further, according to the silencer for combustion equipment according to the preferred embodiment of the present invention, since the hole is formed of a plurality of holes with different diameters, the frequency range that passes through differs depending on the diameter of the hole, and the sound in a wide frequency range can absorb sound.

Further, according to the silencer for a combustion device according to a preferred embodiment of the present invention, since the resonance chamber is provided at a position closer to the gas inlet than the gas exhaust port, the resonance chamber absorbs sound at locations where combustion noise is large. Therefore, a higher noise reduction effect can be obtained.

Further, according to the silencer for a combustion device according to a preferred embodiment of the present invention, since a plurality of resonance chambers are provided, sounds in different frequency ranges can be effectively silenced.

Further, the silencer for a combustion device according to a preferred embodiment of the present invention has a partition plate in which an opening for bending the gas flow path is formed, and a part of the box body and the partition plate are integrally molded. Therefore, a desired gas flow path can be constructed simply by assembling the structure, and a muffler with a simple structure and excellent muffling effect can be obtained.

Further, according to the silencer for a combustion device according to a preferred embodiment of the present invention, the gas flow path is configured by simply laminating the bottom member and the frame member integrally molded with the partition plate, and the number of frame members is Since it can be designed freely, silencers with various gas flow path lengths can be easily assembled as required.

FIG. 1 is a sectional view schematically showing a molded body in a silencer for a combustion device according to a first embodiment of the present invention. FIG. 2 is a perspective view showing the structure of a molded body in the silencer for a combustion device shown in FIG. FIG. 3 is a sectional view schematically showing a molded body in a silencer for a combustion device according to a second embodiment of the present invention. FIG. 4 is a perspective view showing the structure of a molded body in the silencer for a combustion device shown in FIG. 3.

As a result of intensive studies to solve the above problems, the inventors of the present application have discovered that the box body is made of a material containing inorganic fibers and has a gas flow path and a resonance chamber, and the box body resonates with the gas flow path. To improve the sound deadening effect even with a simple structure by providing a hole in the wall located between the chamber and forming a hardened layer on the surface of at least a part of the area on the gas flow path side excluding the hole. I discovered that it can be done.

A silencer for a combustion device according to a first embodiment of the present invention will be described in detail below.

(First embodiment)
FIG. 1 is a sectional view schematically showing a molded body of a silencer for a combustion device according to a first embodiment of the present invention, and FIG. 2 shows a structure of the molded body of a silencer for a combustion device shown in FIG. FIG. A silencer for a combustion device is, for example, a metal housing (not shown) in which a molded body with a silencing function is housed, and is configured to communicate with a combustion gas outlet formed on the side of the combustion device. It is attached.

The molded body 91 includes a gas inlet 51 into which combustion gas discharged from the combustion device is introduced, a gas exhaust port 102 through which the combustion gas is discharged to the outside, and a gas inlet 51 that communicates the gas inlet 51 and the gas exhaust port 102. It has a box body 90 in which a flow path 100a and a resonance chamber 34 adjacent to the gas flow path 100a are provided.
Note that the gas inlet 51 and the gas outlet 102 are provided on surfaces of the box 90 that face each other.

Hereinafter, with reference to FIG. 2, the structure of the molded body of the silencer for a combustion device according to the first embodiment will be described in further detail.
The rectangular parallelepiped-shaped molded body 91 is obtained by laminating the vessel-shaped resonance chamber member 31, the bottom member 92, and the lid member 9 in this order. These members are each integrally molded by suction filtering a material containing inorganic fibers such as rock wool and a binder made of thermosetting resin into a mold formed into a desired shape, and drying the material. It is what was done. As the inorganic fiber, at least one selected from alumina fiber, RCF (Refractory Ceramic Fiber), AES (Alkaline.Earth Silicate) fiber, basalt fiber, silica fiber, zirconia fiber, glass wool, rock wool, etc. can be selected. , or may be used in combination.

The resonance chamber member 31 has a rectangular resonance chamber bottom 31a and a resonance chamber wall 31b rising from the four sides of the resonance chamber bottom 31a, and is not provided with a gas inlet or a gas outlet, and has one side. It is shaped like a container with an opening.

The bottom member 92 has a vessel shape having a rectangular bottom 92a and wall portions 92b rising from the four sides of the bottom portion 92a, and a gas exhaust port 102 is formed by providing a cutout in a part of the wall portion 92b. ing. Furthermore, a plurality of holes 93a, 93b, 93c, and 93d having mutually different diameters are provided in the bottom 92a of the bottom member 92. Further, on the gas flow path 100a side of the bottom portion 92a, a hardened layer 95 is formed by applying an inorganic binder to an area excluding the holes 93a to 93d.
The bottom portion 92a of the bottom member 92 has the same outer dimensions as the opening of the resonance chamber member 31 (peripheral end surface 31c of the resonance chamber wall 31b), and is shaped to cover the opening of the resonance chamber member 31. Therefore, when the bottom member 92 is stacked on the resonance chamber member 31, the two will surely overlap, and the resonance chamber 34 will be formed between the resonance chamber member 31 and the bottom portion 92a of the bottom member 92.

The lid member 9 has a similar shape to the bottom member 92 but is arranged upside down, and is vessel-shaped having an upper base portion 9a and wall portions 9b provided on the four sides thereof. Further, similarly to the bottom member 92, a notch is provided in a part of the wall portion 9b to form the gas inlet 51. Note that the wall portion 92b of the bottom member 92 has the same outer dimensions as the wall portion 9b of the lid member 9, and when the lid member 9 is stacked on the bottom member 92, the area excluding the gas inlet 51 and the gas outlet 102 Then, the two are surely overlapped, and a gas flow path 100a is formed between the bottom member 92 and the lid member 9.

As described above, the resonance chamber member 31, the bottom member 92, and the lid member 9 are stacked in this order to form a molded body 91, and this molded body 91 is stored in a metal housing (not shown). This constitutes a muffler. Note that this housing has openings at positions corresponding to the gas inlet 51 and gas outlet 102 of the molded body 91 when the molded body 91 is stored, and the other parts are completely closed to the molded body. It has a shape that covers 91.

In the silencer configured in this manner, when the combustion gas 8 is introduced from the gas inlet 51, the combustion gas 8 flows through the gas flow path 100a between the lid member 9 and the bottom member 92. Thereafter, part of the combustion gas 8 is directly discharged from the gas outlet 102, and the other combustion gas 8 flows into the resonance chamber 34 through the holes 93a to 93d. A part of the combustion gas 8 that has flowed into the resonance chamber 34 is reflected by the resonance chamber bottom 31a and the resonance chamber wall 31b, which are the walls of the resonance chamber 34, and then passes through the holes 93a to 93d again to the gas flow path 100a. , and is discharged from the gas exhaust port 102.

In this embodiment, since the resonance chamber member 31, the bottom member 92, and the lid member 9 are all made of a material containing highly sound-absorbing inorganic fibers and a binder, the combustion gas 8 flows through the gas flow path 100a. As it passes through, the combustion sound is absorbed by the entire wall surface.
Further, in this embodiment, the resonance chamber 34 is adjacent to the wall (bottom 92a of the bottom member 92) constituting the gas flow path 100a, and the holes 93a to 93d are provided in the bottom 92a, so that the combustion gas When the sound waves 8 are reflected on the wall inside the resonance chamber 34 or go in and out of the holes 93a to 93d, the sound waves cancel each other out, and a high sound silencing effect can be obtained.

Furthermore, in this embodiment, a hardened layer 95 is formed on the gas flow path 100a side of the bottom portion 92a of the bottom member 92. Therefore, when the combustion sound that has entered the resonance chamber 34 together with the combustion gas 8 attempts to pass through the area other than the holes 93a to 93d in the bottom portion 92a toward the gas flow path 100a, it is reflected by the hardened layer 95 and is reflected in the resonance chamber 34. Repeated reflection on the wall inside 34. As a result, compared to the case where the hardened layer 95 is not formed, the sound deadening effect can be significantly improved with a simple structure.
Further, the holes 93a to 93d each have a different diameter, and the frequency range through which the holes pass differs depending on the diameter of the hole, so it is possible to absorb sound in a wide frequency range. Note that the shape of the hole is preferably circular or square.

(Second embodiment)
FIG. 3 is a sectional view schematically showing a molded body of a silencer for a combustion device according to a second embodiment of the present invention, and FIG. 4 shows the structure of the molded body of a silencer for a combustion device shown in FIG. 3. FIG. In the second embodiment, the same or equivalent parts as in the first embodiment are given the same reference numerals in the drawings, and the explanation thereof will be omitted or simplified.

The molded body 101 includes a gas inlet 11 into which combustion gas discharged from a combustion device is introduced, a gas exhaust port 102 through which the combustion gas is discharged to the outside, and a gas inlet 11 that communicates the gas inlet 11 and the gas exhaust port 102. It has a box body 110 with an assembled structure provided with flow paths 20a, 20b, 20c, 20d, and 20e, and a resonance chamber 34 adjacent to the gas flow path 20e via a wall (bottom 92a).
Further, inside the box body 110, a partition plate 6 in which an opening 13 is formed, a partition plate 7 in which an opening 14 is formed, and a wall ( The bottom portions 92a) are arranged substantially parallel to each other with a desired distance therebetween.

The opening 13 of the partition plate 6 is formed close to the wall of the box 110 on the gas inlet 11 side, and the opening 14 of the partition plate 7 is formed close to the wall of the box 110 on the gas outlet 102 side. Formed close to the wall.

Hereinafter, with reference to FIG. 4, the structure of the molded body of the silencer for a combustion device according to the second embodiment will be described in more detail.
The rectangular parallelepiped-shaped molded body 101 has a resonance chamber member 31 and a bottom member 92 similar to those in the first embodiment, and a first frame member 3, a second frame member 4, and a lid member 5 stacked in this order. It is. Note that all of these members are integrally molded, for example, by suction filtering a material containing the above-mentioned inorganic fibers and a binder made of a thermosetting resin into a mold formed into a desired shape, and drying the material. It is what was done. Note that a plurality of holes 93a, 93b, 93c, and 93d are formed in the bottom portion 92a of the bottom member 92, and a hardened layer 95 is formed in an area excluding the plurality of holes 93a to 93d.

The first frame member 3 stacked on the bottom member 92 is vessel-shaped and includes a rectangular partition plate 6 serving as a bottom surface and wall portions 3b rising from the four sides of the partition plate 6. However, the opening 13 is formed in the partition plate 6 at a position close to the surface opposite to the surface on which the gas discharge port 102 is formed. Note that the bottom surface of the first frame member 3 has the same external dimensions as the peripheral end surface 92c of the wall portion 92b of the bottom member 92, so that when the first frame member 3 is stacked on the bottom member 92, both are securely connected. It is designed to overlap.

The second frame member 4 is vessel-shaped and includes a rectangular partition plate 7 serving as a bottom surface and wall portions 4b rising from the four sides of the partition plate 7. However, in the wall portion 4b, a gas inlet 11 is formed by cutting out a part of the surface opposite to the surface on which the gas outlet 102 is formed. Furthermore, an opening 14 is formed in the partition plate 7 at a position close to the surface opposite to the surface on which the gas inlet 11 is formed. Note that the bottom surface of the second frame member 4 has the same outer dimensions as the peripheral end surface 3c of the wall portion 3b of the first frame member 3, and the second frame member 4 is laminated on the first frame member 3. Sometimes the two are designed to ensure that they overlap.

The lid member 5 has a rectangular plate shape. Furthermore, the lid member 5 has the same outer dimensions as the peripheral end surface 4c of the wall portion 4b of the second frame member 4, so that when the lid member 5 is stacked on the second frame member 4, the two are reliably overlapped. It is designed to.
As described above, the resonance chamber member 31, the bottom member 92, the first frame member 3, the second frame member 4, and the lid member 5 are stacked in this order to form the molded body 101. A muffler is constructed by storing the muffler in a metal casing (not shown). Note that when the molded body 101 is stored in this housing, openings are provided at positions corresponding to the gas inlet 11 and the gas outlet 102 of the molded body 101, and the other parts are completely closed to the molded body. It has a shape that covers 101.

In the silencer configured in this way, when the combustion gas 8 is introduced from the gas inlet 11, the combustion gas 8 flows through the gas flow path 20a between the lid member 5 and the partition plate 7, and the gas flow is By passing through the opening 14 serving as the path 20b, the combustion gas 8 is bent and changes its traveling direction, and flows through the gas flow path 20c between the partition plate 7 and the partition plate 6. Thereafter, the combustion gas 8 is bent by passing through the opening 13 that becomes the gas flow path 20d, and further changes its traveling direction, and enters the gas flow path 20e between the partition plate 6 and the bottom part 92a of the bottom member 92. reach.

Thereafter, part of the combustion gas 8 is directly discharged from the gas outlet 102, and the other combustion gas 8 flows into the resonance chamber 34 through the holes 93a to 93d. A part of the combustion gas 8 that has flowed into the resonance chamber 34 is reflected by the resonance chamber bottom 31a and the resonance chamber wall 31b, which are the walls of the resonance chamber 34, and then passes through the holes 93a to 93d again to the gas flow path 20e. , and is discharged from the gas exhaust port 102.

In this embodiment as well, similarly to the first embodiment, the resonance chamber 34 is adjacent to the wall (bottom 92a of the bottom member 92) constituting the gas flow path 20e, and the combustion sound passes through the holes 93a to 93d. Since the noise is canceled by going in and out of the resonance chamber 34, a high silencing effect can be obtained. Furthermore, since the hardened layer 95 is formed on the gas flow path 20e side of the bottom portion 92a of the bottom member 92, the combustion sound that has entered the resonance chamber 34 is absorbed in areas other than the areas where the holes 93a to 93d are formed. It becomes difficult for the gas to permeate from the resonance chamber 34 toward the gas flow path 20e. Therefore, the silencing effect can be significantly improved with a simple structure.

Furthermore, in this embodiment, the opening 13 of the partition plate 6 and the opening 14 of the partition plate 7 are provided at different positions in a plan view from the stacking direction, and furthermore, the openings 13 of the partition plate 6 and the openings 14 of the partition plate 7 are provided at different positions in a plan view from the stacking direction. Since the opening 14 is arranged at a position away from the gas discharge port 12 and the opening 13 is arranged at a position away from the gas discharge port 12, a long meandering gas flow path is formed. The resonance chamber member 31, the bottom member 92, the first frame member 3, the second frame member 4, and the lid member 5, which constitute these gas flow paths, are all made of a material containing inorganic fibers. Therefore, the combustion sound is absorbed by the entire wall surface, and a sufficient noise reduction effect can be obtained.

Further, in this embodiment, the first frame member 3 is formed by integrally molding the partition plate 6 and the wall portion 3b, and the second frame member 4 is formed by integrally molding the partition plate 7 and the wall portion 4b. The bottom member 92 is formed by integrally molding a wall located between the gas flow path 20e and the resonance chamber 34 (the bottom 92a of the bottom member 92) and a wall 92b. In this way, the molded body 101 is composed of five members, each of which has a simple structure: the resonance chamber member 31, the bottom member 92, the first frame member 3, the second frame member 4, and the lid member 5. be able to. Since the silencer can be assembled simply by overlapping (stacking) these members and storing them in the housing, the number of assembly steps is reduced and the manufacturing process can be significantly simplified.

Although this embodiment shows an example in which two frame members 3 and 4 are used, the present invention is not limited to this, and even if there is only one frame member or three or more frame members, A muffler according to the present invention can be constructed.
For example, in the case of one frame member, the resonance chamber member 31, the bottom member 92, the second frame member 4, and the lid member 5 shown in FIGS. 3 and 4 are used, and the bottom member 92 has a second When stacking the frame members 4, they are arranged so that the gas inlet 11 and the gas outlet 102 are in the same direction. As a result, the combustion gas 8 introduced from the gas inlet 11 flows through the gas flow path between the lid member 5 and the partition plate 7, and when it passes through the opening 14, it is bent and the traveling direction is changed. Thereafter, a part of the gas flows through the gas flow path between the partition plate 7 and the bottom part 92a of the bottom member 92, enters and exits the resonance chamber 34, and is then discharged from the gas outlet 102.

In addition, when configured with three frame members, a frame member having the same shape as the resonance chamber member 31, the bottom member 92, the first frame member 3, and the first frame member 3 shown in FIGS. 3 and 4. (not shown), the second frame member 4 and the lid member 5 are used, and the gas inlet 11, the opening of the adjacent frame member, and the gas outlet 12 are arranged in a plan view from the stacking direction. Arrange them so that they are staggered. As a result, a longer meandering gas flow path is formed, and the noise reduction effect can be further improved.
Furthermore, in the same way, by increasing the number of frame members having the same shape as the first frame member 3, the gas flow path can be easily extended. There is no need to prepare. Therefore, by simply preparing casings of different sizes as needed, it is possible to easily manufacture silencers of various sizes with different performances.

In addition, in this embodiment, molds of five types, ie, the resonance chamber member 31, the bottom member 92, the first frame member 3, the second frame member 4, and the lid member 5, are used to mold each member. However, for example, a vessel-shaped member having the same shape as the resonance chamber member 31 in which the gas inlet 11, the opening, the holes 93a to 93d, and the gas outlet 12 are not formed is produced, and then hardened at the desired location. The bottom member and the frame member can be manufactured by forming the layer 95 and cutting out gas inlets, openings, holes, gas outlets, etc. at locations as required. Thereby, the muffler can be manufactured with an extremely small number of molds.

Further, in this embodiment, the rectangular lid member 5 is stacked on the top layer, but the present invention does not necessarily require the lid member 5 to be stacked. For example, the resonance chamber member 31, the bottom member 92, the first frame member 3, and the second frame member 4 are stored in a metal container with an open top, and the container is closed with a metal lid. Functions similar to those of the second embodiment can be obtained.

Note that in the first and second embodiments described above, the bottom member 92 having a plurality of holes 93a to 93d having different diameters was used, but in the present invention, it is not necessary to provide a plurality of holes, and only one hole is sufficient. Further, the shape of the hole is not limited to a circle, but can be formed in various shapes such as an ellipse or a polygon.

Further, a plurality of resonance chambers may be provided at a plurality of locations as long as they are adjacent to the wall that constitutes the gas flow path, and there are no particular restrictions on the number of resonance chambers or the locations where they are formed. Specifically, a hole is provided in a wall located between a plurality of resonance chambers and a flow path. For example, a hole having a different diameter is formed for each of a plurality of resonance chambers, and at least the area excluding the hole is formed with a hole. A configuration may be adopted in which a hardened layer is formed in a portion. For example, by providing a plurality of walls in a direction parallel to the resonance chamber wall 31b inside the resonance chamber member 31 shown in FIGS. 3 and 4, a plurality of resonance chambers can be provided, and one resonance chamber can be Compared to the case where the filter is provided, it is possible to effectively muffle sounds in a wider frequency range.
Furthermore, in the first and second embodiments, the resonance chamber 34 is located close to the gas outlet 102, but if the resonance chamber is provided closer to the gas inlet 11 than the gas outlet 102, Since the combustion sound is absorbed by the resonance chamber in areas where it is loud, a higher noise reduction effect can be obtained.

Further, in the present invention, the material of the hardened layer and the method of forming the hardened layer are not limited. For example, it can be formed by coating or spraying an inorganic binder.

Further, in the first and second embodiments, the resonance chamber member 31 is arranged so that the resonance chamber bottom 31a is horizontal, the bottom member 32 is arranged thereon, and the first frame is arranged as necessary. Although the structure is such that the member 3 and the second frame member 4 are laminated, and the lid member 5 or the lid member 9 is further laminated, the present invention is not limited thereto. For example, the molded body 91 shown in FIG. 1 or the molded body 101 shown in FIG. 3 can be used after being rotated 90° clockwise or counterclockwise. That is, not only when the outlet of the combustion gas discharged from the combustion device (not shown) is formed on the side of the combustion device, but also when the outlet of the combustion gas is formed above or below the combustion device. Even if there is, the silencer for a combustion device according to the present invention can be installed.

3, 4 Frame members 5, 9 Lid members 6, 7 Partition plate 8 Combustion gas 11, 51 Gas inlet 13, 14 Openings 20a, 20b, 20c, 20d, 20e, 100a Gas flow path 31 Resonance chamber member 34 Resonance Chambers 90, 110 Boxes 91, 101 Molded body 92 Bottom members 93a, 93b, 93c, 93d Hole 95 Hardened layer 102 Gas outlet

Claims (7)

A silencer for a combustion device that is attached to a combustion device that burns fuel and discharges combustion gas, and reduces the combustion sound of the combustion gas,
Made of materials containing inorganic fibers,
a gas inlet into which combustion gas discharged from the combustion device is introduced; a gas outlet which discharges the combustion gas to the outside; a gas flow path which communicates the gas inlet and the gas outlet; A box body provided with a resonance chamber adjacent to at least a part of the wall constituting the gas flow path,
A hole is provided in the wall located between the gas flow path and the resonance chamber, and a hardened layer is provided on the surface of the gas flow path side in at least a part of the wall excluding the hole. A silencer for a combustion device , wherein the hardened layer reflects combustion sound that has passed through the wall from the resonance chamber toward the resonance chamber . The muffler for a combustion device according to claim 1, wherein the hole is composed of a plurality of holes having different diameters. The silencer for a combustion device according to claim 1 or 2, wherein the resonance chamber is provided at a position closer to the gas inlet than the gas outlet. The silencer for a combustion device according to claim 1 or 2, wherein a plurality of the resonance chambers are provided. A partition plate is provided inside the box and is made of a material containing inorganic fibers and has an opening for bending the gas flow path;
The silencer for a combustion device according to any one of claims 1 to 4, wherein a part of the box body and the partition plate are integrally formed. The box body includes a resonance chamber member constituting the resonance chamber, a bottom member laminated on the resonance chamber member, and a frame member laminated on the bottom member,
The resonance chamber member is vessel-shaped with one side open,
The bottom member has the wall that covers the opening of the resonance chamber member,
The bottom member and the wall are integrally molded, and
The silencer for a combustion device according to claim 5, wherein the partition plate and the frame member are integrally formed. The box body is formed by laminating the resonance chamber member, the bottom member integrally molded with the wall, and the plurality of frame members integrally molded with the partition plate,
7. The noise reduction device for a combustion device according to claim 6, wherein the meandering gas flow path is configured by providing openings of two adjacent partition plates at different positions in a plan view from the stacking direction. vessel.

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