JP7381382B2 - 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 fuel and discharges 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, since the silencers described in Patent Documents 1 and 2 have an extremely large number of parts, the number of assembly steps is also increased, making the manufacturing method 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 provides a silencer for combustion equipment that has an excellent noise reduction effect, has a simple structure, and can reduce the number of parts and assembly steps. The purpose is to provide.

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 noise of the combustion gas,
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, and a gas flow path which communicates the gas inlet and the gas outlet. A box with an assembled structure provided,
a partition plate disposed inside the box body and having an opening for bending the gas flow path;
The box body and the partition plate are made of a material containing inorganic fibers,
A silencer for a combustion device, wherein a part of the box body and the partition plate are integrally molded.

Further, the silencer for a combustion device of the present invention is preferably one of the following (2) to (9).

(2) The box body includes a bottom member and a frame member stacked on the bottom member,
The silencer for a combustion device according to (1), wherein the partition plate and the frame member are integrally molded.

(3) The box body is formed by laminating a plurality of the frame members integrally molded with the partition plate on the bottom member,
The noise reduction for a combustion device according to (2), 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.

(4) The box further includes a lid member made of a material containing inorganic fibers,
The bottom member, the frame member, and the lid member are stacked in this order,
The gas inlet is provided in any one of the bottom member, the frame member, and the lid member, and the gas outlet is provided in any one of the bottom member, the frame member, and the lid member. The silencer for a combustion device according to (2) or (3).

(5) The gas flow path has a bent part bent by the opening and a straight part through which the combustion gas flows linearly, and the opening area of the opening is determined by the combustion in the straight part. The silencer for a combustion device according to any one of (1) to (4), which has a cross-sectional area in a direction perpendicular to the direction in which the gas flows.

(6) The box further includes a resonance chamber adjacent to at least a portion of the wall constituting the gas flow path,
The silencer for a combustion device according to any one of (1) to (5), wherein a hole is provided in the wall located between the gas flow path and the resonance chamber.

(7) The silencer for a combustion device according to (6), wherein the wall is provided with a plurality of the holes having different diameters.

(8) The silencer for a combustion device according to (6) or (7), wherein the resonance chamber is provided at a position closer to the gas inlet than the gas outlet.

(9) The silencer for a combustion device according to (6) or (7), wherein a plurality of the resonance chambers are provided.

According to the silencer for a combustion device of the present invention, since it has a box body having a gas inlet and a gas outlet and a partition plate in which an opening is formed, the gas flow path can be bent. Further, since the box body and the partition plate are made of a material containing inorganic fibers, sound can be absorbed over the entire surface of the gas flow path with a small number of parts. Therefore, it is possible to improve the excellent silencing effect.

Furthermore, according to the silencer for combustion equipment of the present invention, a part of the box body and the partition plate are integrally molded, and a desired gas flow path can be configured just by assembling, so the structure is simple. The number of parts and assembly steps can be reduced.

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 having various gas flow path lengths can be easily assembled as required.

Furthermore, according to the silencer for a combustion device according to a preferred embodiment of the present invention, the gas flow path has a bent part bent by the opening and a straight part through which the combustion gas flows linearly, When the opening area of the opening is larger than the cross-sectional area of the straight portion, the cross-sectional area of the flow path can be changed, the resonance frequency can be changed, and the silencing effect can be further enhanced.

Furthermore, the silencer for a combustion device according to a preferred embodiment of the present invention has a resonance chamber adjacent to at least a part of the wall constituting the gas flow path, and has a resonance chamber between the gas flow path and the resonance chamber. If a hole is provided in the wall where the sound is located, an even greater sound deadening effect can be obtained. In addition, if a plurality of holes with different diameters are provided, it is possible to absorb sound in a wide frequency range, and if the resonance chamber is provided at a position closer to the gas inlet than the gas outlet, combustion Since the sound is absorbed by the resonance chamber in loud areas, it is possible to obtain a higher noise reduction effect.

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 cross-sectional view schematically showing a molded body in a silencer for a combustion device according to a third embodiment of the present invention.

As a result of intensive studies to solve the above problems, the inventors of the present application have found that, for example, the box that constitutes the bottom and side surfaces and the partition plate arranged inside the box are made of a material containing inorganic fibers. By integrally molding part of the box and the partition plate to create an assembled structure, it is possible to secure the combustion gas flow path length with a simple structure, and the number of parts can be significantly reduced. I found out what I can do.

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 having a silencing function is housed, and communicates with, for example, a combustion gas outlet formed on the side of the combustion device. It can be installed like this.

The molded body 1 includes a gas inlet 11 into which combustion gas discharged from a combustion device is introduced, a gas outlet 12 through which the combustion gas is discharged to the outside, and a gas inlet 11 that communicates the gas inlet 11 and the gas outlet 12. The box body 10 has an assembled structure in which flow paths 20a, 20b, 20c, 20d, and 20e are provided.
Further, inside the box body 10, a partition plate 6 in which an opening 13 is formed and a partition plate 7 in which an opening 14 is formed are arranged substantially in parallel with a desired interval. The opening 13 of the partition plate 6 is formed close to the wall of the box body 10 on the gas inlet 11 side, and the opening 14 of the partition plate 7 is formed close to the wall of the box body 10 on the gas outlet 12 side. Formed close to the wall.

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 1 is obtained by laminating a bottom member 2, a first frame member 3, a second frame member 4, and a lid member 5 in this order. All of these members are made 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 then drying the material. It is integrally molded. 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 bottom member 2 has a vessel shape having a rectangular bottom 2a and a wall 2b rising from the four sides of the bottom 2a, and a gas outlet 12 is formed by providing a cutout in a part of the wall 2b. There is. The first frame member 3 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 12 is formed. Note that the bottom surface of the first frame member 3 has the same outer dimensions as the peripheral end surface 2c of the wall portion 2b of the bottom member 2, so that when the first frame member 3 is stacked on the bottom member 2, 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 12 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 bottom member 2, the first frame member 3, the second frame member 4, and the lid member 5 are laminated in this order to form the molded body 1, and this molded body 1 is placed in a metal casing. (not shown) to constitute a muffler. Note that this housing has openings at positions corresponding to the gas inlet 11 and gas outlet 12 of the molded body 1 when the molded body 1 is stored, and the other parts are completely closed to the molded body. It has a shape that covers 1.

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 the gas flow path 20e between the partition plate 6 and the bottom part 2a of the bottom member 2 is bent. It circulates and is discharged from the gas outlet 12.

In the present 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 are further away from the gas inlet 11. Since the opening 14 is arranged at the position and the opening 13 is arranged at a position away from the gas discharge port 12, a meandering long gas flow path is formed. In addition, since all the members are made of materials containing inorganic fibers, when the combustion gas 8 passes through the gas channels 20a to 20e, the combustion sound is absorbed by the entire wall surface, making it possible to obtain a sufficient muffling effect.
The molded body 1 is made up of four members: a bottom member 2, a first frame member 3, a second frame member 4, and a lid member 5, all of which have a simple structure and are stacked together. ) It can be assembled by simply storing it in the case. Therefore, 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, when configuring with one frame member, the bottom member 2, second frame member 4, and lid member 5 shown in FIG. 2 are used, and when laminating the second frame member 4 on the bottom member 2, , so that the gas inlet 11 and the gas outlet 12 are arranged in the same direction. As a result, the combustion gas introduced from the gas inlet 11 flows through the gas flow path between the lid member 5 and the partition plate 7, and after passing through the opening 14, it is bent and changes its direction of travel. The gas flows through the gas flow path between the partition plate 7 and the bottom part 2a of the bottom member 2, and is discharged from the gas outlet 12.

In addition, in the case of three frame members, a bottom member 2, a first frame member 3, a frame member (not shown) having the same shape as the first frame member 3, and a second frame member shown in FIG. A frame member 4 and a lid member 5 are used, and the gas inlets 11, the openings of adjacent frame members, and the gas exhaust ports 12 are arranged alternately in a plan view as viewed from the stacking direction. 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, the bottom member 2, the first frame member 3, the second frame member 4, and the lid member 5 were manufactured using molds with four different shapes. A bottom member and A frame member can be manufactured. Thereby, the muffler can be manufactured with an extremely small number of molds.

Next, a silencer for a combustion device according to a second embodiment of the present invention will be described in detail below.

(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. In the second embodiment and the subsequent third 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.

In the second embodiment, similarly to the first embodiment, the molded body 21 is constructed by laminating the bottom member 2, the first frame member 3, the second frame member 4, and the lid member 5 in this order. ing. However, in the partition plate 26 serving as the bottom surface of the first frame member 3, an opening 23 having a larger area than in the first embodiment is formed. Furthermore, an opening 24 having a larger area than that in the first embodiment is also formed in the partition plate 27 that serves as the bottom surface of the second frame member 4.

Specifically, among the gas flow paths 20a, 20b, 20c, 20d, and 20e, the gas flow paths 20a, 20c, and 20e through which combustion gas flows linearly are defined as straight portions, and the gas flow paths through which combustion gas flows in a curved manner are defined as straight portions. When the flow paths 20b and 20d are bent portions, the opening areas of the openings 24 and 23 that constitute the bent portions (gas flow paths 20b and 20d) are the same as those of the straight portions (gas flow paths 20a, 20c, and 20e). The openings 24 and 23 are formed so as to have a larger cross-sectional area in a direction perpendicular to the direction in which combustion gas flows.

Also in the second embodiment 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 27, By passing through the opening 24, the combustion gas 8 bends and changes its traveling direction, and flows through the gas flow path 20c between the partition plate 27 and the partition plate 26. Thereafter, the combustion gas 8 passes through the opening 23, bends and further changes its traveling direction, flows through the gas flow path 20e between the partition plate 26 and the bottom 2a of the bottom member 2, and flows through the gas outlet. It is discharged from 12.

Therefore, as in the first embodiment, a long meandering gas flow path is formed, and all members are made of a material containing inorganic fibers, so that a sufficient sound damping effect can be obtained. Furthermore, the molded bodies 21 have a simple structure and can be assembled by simply stacking them, so the number of assembly steps is reduced and the manufacturing process can be significantly simplified.

Furthermore, in the second embodiment, when the combustion gas 8 that has passed through the gas flow path 20a passes through the gas flow path 20b, the cross-sectional area of the flow path becomes large. Then, after the combustion gas 8 passes through the gas flow path 20c having a narrow cross-sectional area, the cross-sectional area of the flow path increases when passing through the gas flow path 20d. In this way, the combustion gas 8 passes through a narrow channel in the straight section, and momentarily passes through a wide channel when passing through the bent section (openings 24 and 23), so the cross-sectional area of the channel increases. By changing , the resonant frequency can be changed. Therefore, compared to the first embodiment, the silencing effect can be further enhanced.

Note that the areas of the openings 23 and 24 can be appropriately designed depending on the balance between the above-mentioned degree of silencing effect and the strength of the molded body 21. In order to further enhance the silencing effect, the area of the opening 23 or the opening 24 is preferably 300% or more, more preferably 600% or more of the cross-sectional area in the direction perpendicular to the direction in which the combustion gas flows in the straight section. It is better to In addition, when the cross-sectional area of the straight part differs depending on the gas flow path, it is taken as a ratio with respect to the straight part located immediately before the opening (bending part) with reference to the direction in which combustion gas flows.

Next, a silencer for a combustion device according to a third embodiment of the present invention will be described in detail below.

(Third embodiment)
FIG. 4 is a sectional view schematically showing a molded body of a silencer for a combustion device according to a third embodiment of the present invention.
A molded body 30 of a silencer for a combustion device according to the third embodiment has a bottom member 32, a first frame member 3, a second frame member 4, and a lid member 5 stacked on a vessel-shaped resonance chamber member 31. It is something that Specifically, the resonance chamber member 31 is made of a material containing inorganic fibers and a binder made of a thermosetting resin, and has a rectangular resonance chamber bottom 31a and a resonance chamber shaped to rise from the four sides of the resonance chamber bottom 31a. It has a wall 31b and is shaped like a container without a gas inlet, gas outlet, etc.

Further, the bottom member 32 is shaped like a container having a rectangular bottom portion 32a and wall portions 32b rising from the four sides of the bottom portion 32a, and a gas exhaust port 12 is formed by cutting out a portion of the wall portion 32b. There is. Further, the bottom portion 32a of the bottom member 32 is provided with a plurality of holes 33a, 33b, 33c, and 33d having mutually different diameters. The bottom part 32a of the bottom member 32 has the same outer dimensions as the peripheral edge surface 31c of the resonance chamber wall 31b of the resonance chamber member 31, so that when the bottom member 32 is stacked on the resonance chamber member 31, both sides are securely stacked. A resonance chamber 34 is formed between the resonance chamber member 31 and the bottom portion 32a of the bottom member 32 in an overlapping manner.
The configurations of the first frame member 3, second frame member 4, and lid member 5 stacked on the bottom member 32 are the same as in the first embodiment.

Also in the third embodiment 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 paths 20a, 20b, 20c, 20d, and 20e. Thereafter, when the combustion gas 8 passes through the gas flow path 20e, part of it flows into the resonance chamber via the holes 33a to 33d. Then, these combustion gases 8 return to the gas flow path 20e again through the holes 33a to 33d and are discharged from the gas outlet 12.

Similar to the first embodiment, the third embodiment has a meandering long gas flow path, and all members are made of a material containing inorganic fibers, so that a sufficient sound damping effect can be obtained. Moreover, the molded bodies 21 have a simple structure and can be assembled by simply stacking them, so the number of assembly steps is reduced and the manufacturing process can be significantly simplified.

Furthermore, in the third embodiment, since the resonance chamber 34 is adjacent to the wall (bottom 32a of the bottom member 32) constituting the gas flow path 20e, and the holes 33a to 33d are provided in the bottom 32a, the combustion When the gas 8 is reflected on the wall inside the resonance chamber 34 or goes in and out of the holes 33a to 33d, the sound waves cancel each other out, thereby achieving a high noise reduction effect.
Further, since the holes 33a to 33d each have a different diameter, it is possible to absorb sound in a wide frequency range.

In this embodiment, the bottom member 32 having a plurality of holes 33a to 33d with different diameters is used, but in the present invention, it is not necessary to provide a plurality of holes, and only one hole is sufficient. 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. Furthermore, in the present embodiment, the resonance chamber is placed close to the gas outlet 12, but if the resonance chamber is provided closer to the gas inlet 11 than the gas outlet 12, the combustion noise may be louder at a location where the combustion noise is louder. Since the sound is absorbed by the resonance chamber, it is possible to obtain a higher sound silencing effect.

In the first to third embodiments described above, the rectangular lid member 5 is stacked on the uppermost layer, but the present invention does not necessarily require the lid member 5 to be stacked. For example, the molded bodies 1, 21, and 30 are stored in a metal case, but by storing the bottom member and frame member in a metal container with an open top and closing it with a metal lid, the above-mentioned Functions similar to those of the first to third embodiments can be obtained.

Further, in the first to third embodiments, the bottom member is arranged so that the bottom part is horizontal, and the frame member is laminated on top of it so that the partition plate is horizontal. For example, the molded body 1 shown in FIG. 1 can be used after being rotated 90 degrees 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.

1, 21, 30 Molded body 2, 32 Bottom member 3, 4 Frame member 5 Lid member 6, 7, 26, 27 Partition plate 8 Combustion gas 10 Box body 11 Gas inlet 12 Gas outlet 13, 14, 23, 24 Openings 20a, 20b, 20c, 20d, 20e Gas flow path 31 Resonance chamber members 33a, 33b, 33c, 33d Hole 34 Resonance chamber

Claims (8)

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,
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, and a gas flow path which communicates the gas inlet and the gas outlet. A box with an assembled structure provided,
a partition plate disposed inside the box body and having an opening for bending the gas flow path;
The box body and the partition plate are made of a material containing inorganic fibers,
A part of the box body and the partition plate are integrally molded ,
The gas flow path has a bent part bent by the opening, and a straight part through which the combustion gas flows, and the opening area of the opening is such that the combustion gas in the straight part flows. 300% or more larger than the cross-sectional area in the direction perpendicular to the direction,
Silencer for combustion equipment. The box body includes a bottom member and a frame member stacked on the bottom member,
The silencer for a combustion device according to claim 1, wherein the partition plate and the frame member are integrally formed. The box body is formed by laminating a plurality of the frame members integrally molded with the partition plate on the bottom member,
The noise reduction device for a combustion device according to claim 2, 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. The box further includes a lid member made of a material containing inorganic fibers,
The bottom member, the frame member, and the lid member are stacked in this order,
The gas inlet is provided in any one of the bottom member, the frame member, and the lid member, and the gas outlet is provided in any one of the bottom member, the frame member, and the lid member. The silencer for a combustion device according to claim 2 or 3. The box further includes a resonance chamber adjacent to at least a portion of the wall constituting the gas flow path,
The silencer for a combustion device according to any one of claims 1 to 4 , wherein a hole is provided in the wall located between the gas flow path and the resonance chamber. 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,
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, and a gas flow path which communicates the gas inlet and the gas outlet. A box with an assembled structure provided,
a partition plate disposed inside the box body and having an opening for bending the gas flow path;
The box body and the partition plate are made of a material containing inorganic fibers,
A part of the box body and the partition plate are integrally molded,
The box further includes a resonance chamber adjacent to at least a portion 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,
The wall is provided with a plurality of holes having different diameters,
Silencer for combustion equipment. 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,
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, and a gas flow path which communicates the gas inlet and the gas outlet. A box with an assembled structure provided,
a partition plate disposed inside the box body and having an opening for bending the gas flow path;
The box body and the partition plate are made of a material containing inorganic fibers,
A part of the box body and the partition plate are integrally molded,
The box further includes a resonance chamber adjacent to at least a portion 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,
The resonance chamber is provided at a position closer to the gas inlet than the gas outlet,
Silencer for combustion equipment. 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,
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, and a gas flow path which communicates the gas inlet and the gas outlet. A box with an assembled structure provided,
a partition plate disposed inside the box body and having an opening for bending the gas flow path;
The box body and the partition plate are made of a material containing inorganic fibers,
A part of the box body and the partition plate are integrally molded,
The box further includes a resonance chamber adjacent to at least a portion 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,
A plurality of the resonance chambers are provided,
Silencer for combustion equipment.

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