JP7448399B2 - 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, the silencers described in Patent Documents 1 and 2 are manufactured using a sound absorbing material and a steel plate, and have a complicated structure, which makes assembly work 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 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. It has a box body provided with
The wall surface constituting the gas flow path is made of a material containing inorganic fibers,
The gas flow path has at least a pair of opposing first and second wall surfaces,
The first wall surface and the second wall surface have a wave shape in which protrusions and recesses extending in a direction substantially perpendicular to the direction in which the combustion gas flows are repeated.

Further, the silencer for a combustion device of the present invention is preferably one of the following (2) to (11).

(2) When viewed from above in a direction in which the first wall surface and the second wall surface face each other, the protruding portion of the first wall surface and the concave portion of the second wall surface are formed at positions that substantially coincide with each other. The silencer for a combustion device according to (1).

(3) When viewed from above in a direction in which the first wall surface and the second wall surface face each other, the protruding portions of the first wall surface and the protruding portions of the second wall surface are located at substantially coincident positions. The silencer for a combustion device according to (1), which is formed.

(4) When the surface connecting the vertices of the protrusions on the first wall surface is a first virtual surface, and the surface connecting the vertices of the protrusions on the second wall surface is a second virtual surface, the first The silencer for a combustion device according to (2) or (3), wherein the virtual surface is located closer to the first wall surface than the second virtual surface.

(5) The difference in height between the apex of the protruding portion on the first wall surface and the second wall surface and the bottom point of the concave portion adjacent to the protruding portion is determined from the gas inlet to the gas outlet. The silencer for a combustion device according to any one of (1) to (4), which is formed to become smaller as it approaches.

(6) A partition plate having an opening for bending the gas flow path is formed inside the box,
The partition plate has a corrugated plate shape in which the concave portion and the protruding portion extending in a direction substantially perpendicular to the direction in which the combustion gas flows are repeated;
The noise reduction device for a combustion device according to any one of (1) to (5), wherein the first wall surface and the second wall surface are constituted by either an inner wall surface of the box body or a surface of the partition plate. vessel.

(7) The protruding portion on one surface of the partition plate and the concave portion on the other surface of the partition plate are formed at positions corresponding to each other,
The silencer for a combustion device according to (6), wherein the radius of curvature of the protruding portion and the radius of curvature of the concave portion are different from each other.

(8) The box body and the partition plate are made of a material containing inorganic fibers,
The silencer for a combustion device according to (6) or (7), wherein a part of the box and the partition plate are integrally formed.

(9) The box body includes a bottom member and a frame member stacked on the bottom member,
The silencer for a combustion device according to (8), wherein the partition plate and the frame member are integrally molded.

(10) 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 (9), 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.

(11) 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 (9) or (10).

According to the silencer for a combustion device of the present invention, the wall surface constituting the gas flow path is made of a material containing inorganic fibers, and a plurality of protrusions and concave portions are repeatedly formed on the first wall surface constituting the gas flow path. Since the second wall surface also has a wave shape in which a plurality of protrusions and recesses are repeatedly formed, the combustion gas passes through the gas flow path while colliding with the protrusions. Therefore, an excellent sound deadening effect can be obtained.

Further, according to the silencer for a combustion device according to a preferred embodiment of the present invention, the protruding portion of the first wall surface and the concave portion of the second wall surface are formed at substantially coincident positions in a plan view. , the combustion gas passes through the gas flow path while meandering little by little within the gas flow path. Therefore, the apparent length of the gas flow path can be increased, and an even more excellent sound damping effect can be obtained.

Furthermore, according to the silencer for a combustion device according to a preferred embodiment of the present invention, the protruding portion on the first wall surface and the protruding portion on the second wall surface are formed at substantially coincident positions in a plan view. Therefore, the cross-sectional area of the gas flow path changes depending on the position of the gas flow path, and the resonance frequency of absorbed sound changes. Therefore, excellent silencing effects can be obtained over a wide frequency range.

Furthermore, according to the silencer for a combustion device according to a preferred embodiment of the present invention, the difference in height between the apex of the protruding portion and the bottom point of the concave portion adjacent to the protruding portion is equal to the distance from the gas inlet. It is formed to become smaller as it approaches the gas exhaust port. Therefore, in an area close to the gas inlet and where the combustion noise is loud, the combustion gas flows through the gas flow path while colliding with the large protrusion, so that the combustion noise of the combustion gas can be more effectively reduced.

Furthermore, according to the silencer for a combustion device according to a preferred embodiment of the present invention, the box body includes 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 provided. Since the plate and the plate are integrally molded, a desired gas flow path can be constructed simply by assembling, and a muffler with a simple structure and excellent muffling effect can be easily manufactured.

Further, according to the silencer for a combustion device according to a preferred embodiment of the present invention, the gas flow path is configured simply by 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 of 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 the molded body of the silencer for a combustion device shown in FIG. 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. 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. FIG. 5 is a cross-sectional view schematically showing a molded body of a silencer for a combustion device according to a fourth embodiment of the present invention. FIG. 6 is a perspective view showing the structure of the molded body of the silencer for a combustion device shown in FIG. 5.

As a result of intensive studies to solve the above problems, the inventors of the present application have found that the wall surface constituting the gas flow path is composed of a pair of first and second wall surfaces made of a material containing inorganic fibers. By making the first wall surface and the second wall surface have a corrugated plate shape in which concave portions and protruding portions extending in a direction substantially orthogonal to the direction in which combustion gas flows are repeated, even a simple structure can be achieved. It has been found that the silencing effect can be improved.

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 161 communicates a gas inlet 171 into which combustion gas 8 discharged from the combustion device is introduced, a gas outlet 172 through which the combustion gas 8 is discharged to the outside, and a gas inlet 171 and a gas outlet 172. The box body 160 is provided with a gas flow path 170a.
Note that the gas flow path 170a has a pair of opposing first and second wall surfaces 173 and 174. Further, the gas inlet 171 and the gas outlet 172 are provided on surfaces of the box 160 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 161 has a bottom member 162 and a lid member 169 laminated in this order. Note that 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 bottom member 162 has a vessel shape having a rectangular bottom 162a and wall portions 162b rising from the four sides of the bottom portion 162a, and a gas exhaust port 172 is formed by providing a cutout in a part of the wall portion 162b. ing. Further, on the gas flow path 170a side surface (first wall surface 173) of the bottom portion 162a of the bottom member 162, protruding portions 173a and recessed portions 173b extending in a direction perpendicular to the direction in which the combustion gas 8 flows are repeatedly formed. The first wall surface 173 has a continuous wave shape.

The lid member 169 has the same shape as the bottom member 162, but is arranged upside down and left and right, and has a vessel shape having an upper base portion 169a and wall portions 169b provided on its four sides. Further, like the bottom member 162, a notch is provided in a part of the wall portion 169b to form a gas inlet 171. Furthermore, protrusions 174a and recesses 174b extending in a direction perpendicular to the direction in which combustion gas 8 flows are repeatedly formed on the gas flow path 170a side surface (second wall surface 174) of the upper bottom portion 169a of the lid member 169. The second wall surface 174 also has a continuous wave shape.

Note that the wall portion 162b of the bottom member 162 has the same outer dimensions as the wall portion 169b of the lid member 169, and when the lid member 169 is stacked on the bottom member 162, the area excluding the gas inlet 171 and the gas outlet 172 It is designed to ensure that the two overlap. Furthermore, in the present embodiment, when viewed in plan from the direction in which the first wall surface 173 and the second wall surface 174 face each other, the protruding portion 173a of the first wall surface 173 and the recessed portion 174b of the second wall surface 174 are , are formed in matching positions.
Hereinafter, in the present specification, a plan view viewed from a direction facing the first wall surface and the second wall surface constituting the gas flow path may be simply referred to as a plan view.

As described above, the bottom member 162 and the lid member 169 are stacked in this order to form a molded body 161, and this molded body 161 is stored in a metal casing (not shown), so that the silencer is configured. Note that this housing has openings at positions corresponding to the gas inlet 171 and gas outlet 172 of the molded body 161 when the molded body 161 is stored, and the other parts are completely closed to the molded body. It has a shape that covers 161.

In the silencer configured in this way, when the combustion gas 8 is introduced from the gas inlet 171, the combustion gas 8 flows through the gas passage 170a between the lid member 169 and the bottom member 162, and the gas is exhausted. It is discharged from outlet 172.

In this embodiment, the wall surface constituting the gas flow path 170a is made of a material containing highly sound-absorbing inorganic fibers and has a corrugated shape, so that the combustion gas collides with the corrugated wall surface and the gas It passes through the flow path 170a. Therefore, the combustion sound is absorbed on the entire wall surface, and the sound damping effect can be significantly improved compared to a muffler having a metal wall.

Further, in this embodiment, a plurality of protrusions 173a and a recessed part 173b are repeatedly formed on the first wall surface 173 constituting the gas flow path 170a, and a plurality of protrusions 174a and a recessed part are also formed on the second wall surface 174. 174b are repeatedly formed, and both the first wall surface 173 and the second wall surface 174 have a wave shape. In the present embodiment, the protruding portion 173a of the first wall surface 173 and the recessed portion 174b of the second wall surface 174 are formed at the same position, so that the combustion gas 8 meanders inside the gas flow path 170a. pass through.

In this embodiment, a surface connecting the vertices of the protrusions 173a on the first wall surface 173 is referred to as a first virtual surface 175, and a surface connecting the vertices of the protrusions 174a on the second wall surface 174 is referred to as a second virtual surface. 176, the first virtual surface 175 is designed to be located closer to the first wall surface 173 than the second virtual surface 176. That is, the main flow direction of the combustion gas 8 in the flow path 170a is not changed by the protrusions 173a and 174a, and the combustion gas 8 passes toward the gas outlet while meandering little by little. Therefore, in addition to the silencing effect obtained when the combustion gas 8 collides with the protrusions 173a and 174a, the apparent length of the gas flow path becomes longer in this embodiment, so that the silencing effect of the silencer is reduced. This can be further improved.

Note that in the first embodiment described above, the protruding portion 173a of the first wall surface 173 and the concave portion 174b of the second wall surface 174 are formed at positions that completely coincide with each other in plan view. It is not necessary to match the positions completely, but it is sufficient that the positions match approximately. That is, the relative positions of the protruding portion 173a and the recessed portion 174b may be determined so that the combustion gas 8 passes through the flow path 170a while meandering little by little toward the gas outlet 172.

(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 and fourth embodiments, 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 second embodiment is a modification of the first embodiment, and like the first embodiment, the molded body 181 has a bottom member 162 and a lid member 169 laminated in this order. Further, on the gas flow path 170a side surface (first wall surface 183) of the bottom portion 162a of the bottom member 162, a protruding portion 183a and a recessed portion 183b extending in a direction perpendicular to the direction in which the combustion gas 8 flows are repeatedly formed. The first wall surface 183 has a continuous wave shape.

On the other hand, a protruding portion 184a and a recessed portion 184b extending in a direction perpendicular to the direction in which the combustion gas 8 flows are repeatedly formed on the gas flow path 170a side surface (second wall surface 184) of the upper bottom portion 169a of the lid member 169. The second wall surface 184 also has a continuous wave shape.
However, in the second embodiment, the relative positions of the protrusion 183a and the protrusion 184a are different from the first embodiment, and the protrusion 183a of the first wall surface 183 and the protrusion 184a of the second wall surface 184 are are formed at the same position in plan view.

Also in this embodiment, the surface connecting the vertices of the protrusions 183a on the first wall surface 183 is the first virtual surface 175, and the surface connecting the vertices of the protrusions 184a on the second wall surface 184 is the second virtual surface 175. When the surface 176 is assumed, the first virtual surface 175 is designed to be located closer to the first wall surface 173 than the second virtual surface 176. Thereby, a gap is formed between the protruding part 183a of the first wall surface 183 and the protruding part 184a of the second wall surface 184, so that the combustion gas 8 can flow.
In addition, in this embodiment, since the protruding part 183a of the first wall surface 183 and the protruding part 184a of the second wall surface 184 are formed at the same position in plan view, the first virtual surface 175 and the first virtual surface 175 are If the two imaginary planes 176 are located close to each other, the gas flow path 170a becomes partially narrow, and the flowability of the combustion gas 8 is reduced. Therefore, it is preferable to design the heights of the protrusions 183a and 184a so as not to impede the flowability of the gas flow path 170a.

Also in the silencer according to the second embodiment configured in this way, when the combustion gas 8 is introduced from the gas inlet 171, the gas flow path 170a between the lid member 169 and the bottom member 162 is connected to the combustion gas 8. flows and is discharged from the gas outlet 172. At this time, since the wall surface constituting the gas flow path 170a is made of a material containing highly sound-absorbing inorganic fibers and a binder and has a corrugated shape, the combustion gas 8 collides with the corrugated wall surface. , passes through the gas flow path 170a. Therefore, the silencing effect can be significantly improved.

Further, in this embodiment, the protruding portion 183a and the protruding portion 184a are formed at the same positions in the opposing first and second wall surfaces 183 and 184 in plan view. Therefore, the cross-sectional area of the gas flow path 170a changes depending on the position where the combustion gas 8 flows. That is, in the first wall surface 183 and the second wall surface 184 constituting the gas flow path 170a, in the region where the protruding portions 183a and the protruding portions 184a are formed to face each other, a portion of the combustion gas 8 flows through the protruding portions. After colliding with the protruding portion 183a and the protruding portion 184a, the liquid passes through a narrow channel, and then passes through a wide channel formed by facing the concave portions 183b and 184b, so that the cross-sectional area of the channel changes greatly. do. As a result, the resonance frequency of the absorbed sound changes, so that the silencing effect can be improved in a wide frequency range.

Note that in the second embodiment described above, the protruding portion 183a of the first wall surface 183 and the protruding portion 184a of the second wall surface 184 are formed at the same position in plan view, but the present invention It is not necessary to completely match the positions, but it is sufficient if the positions approximately match. That is, the relative positions of the protrusion 183a and the protrusion 184a may be determined so that the cross-sectional area of the gas flow path 170a changes.

As shown in the first and second embodiments, the present invention allows the relative positions of the wave shapes on the opposing wall surfaces to be freely designed depending on the required characteristics of the muffler. For example, when placing importance on the flowability of combustion gas, it is preferable to apply the first embodiment, which has less obstruction to the gas flow path, and when aiming for a silencing effect in a wide frequency range, it is preferable to apply the second embodiment. It is preferable to apply the form.
In the first and second embodiments, the lid member 169 can be manufactured in the same shape as the bottom member 162 if the relative positions of the wave shapes on the opposing wall surfaces are determined in advance. Therefore, it is not necessary to prepare molds of a plurality of shapes, and it is possible to easily manufacture a muffler having an extremely simple structure and excellent muffling function.

(Third embodiment)
FIG. 4 is a cross-sectional view schematically showing a molded body of a silencer for a combustion device according to a third embodiment of the present invention.

The third embodiment is a modification of the second embodiment, and like the second embodiment, the molded body 191 has a bottom member 162 and a lid member 169 laminated in this order. Further, on the gas flow path 170a side surface (first wall surface 193) of the bottom portion 162a of the bottom member 162, protrusions 193a, 193c and concave portions 193b, 193d, which extend in a direction perpendicular to the direction in which the combustion gas 8 flows, are provided. are repeatedly formed, and the first wall surface 193 has a continuous wave shape.

On the other hand, on the gas flow path 170a side surface (second wall surface 194) of the upper bottom portion 169a of the lid member 169, there are protrusions 194a, 194c and concave portions 194b, 194d extending in a direction perpendicular to the direction in which the combustion gas 8 flows. are repeatedly formed, and the second wall surface 194 also has a continuous wave shape.
Further, the relative positions of the protrusions 193a, 193c and the protrusions 194a, 194c are similar to the second embodiment. are formed at the same position in plan view, and the protruding part 193c of the first wall surface 193 and the protruding part 194c of the second wall surface 194 are formed in the same position in plan view.

However, in the third embodiment, the sizes of the protrusions are different within the same wall surface. For example, on the first wall surface 193, the height of the protrusion 193c formed near the gas outlet 172 is higher than the height of the protrusion 193a formed near the gas inlet 171. It is designed to be small. Similarly, on the second wall surface 194, the height of the protrusion 194c formed near the gas outlet 172 is higher than the height of the protrusion 194a formed near the gas inlet 171. It is also designed to be smaller.

Note that the height of the protruding portion in this embodiment refers to the difference in height between the apex of the protruding portion and the bottom point of the concave portion adjacent to the protruding portion. In addition, the concave portion adjacent to the protruding portion refers to the concave portion adjacent to the upstream side of the protruding portion and the concave portion adjacent to the downstream side of the protruding portion, the bottom point and the apex of the protruding portion. The concave portion with the larger height difference is selected.

Also in the silencer according to the third embodiment configured in this way, the wall surface constituting the gas flow path 170a is made of a material containing highly sound-absorbing inorganic fibers and a binder, and has a corrugated shape. Therefore, the combustion gas 8 passes through the gas flow path 170a while colliding with the corrugated wall surface. Therefore, the silencing effect can be significantly improved.
Further, in this embodiment, the height of the protruding portion 193a and the protruding portion 194a near the gas inlet 171 is set higher than the height of the protruding portion 193c and the protruding portion 194c near the gas outlet 172. It is formed. Therefore, the combustion gas 8, which generates a large noise just after being introduced into the muffler, collides with the large protrusions 193a and 194a, and can be effectively muffled. In addition, since the noise generated by the combustion gas 8 is small near the gas discharge port 172, the small protrusions 193c and 194c improve the circulation of the combustion gas 8 while maintaining the silencing effect. can be done.

In the third embodiment shown in FIG. 4, as the gas inlet 171 approaches the gas outlet 172, the heights of the protrusions 193a and 194a gradually decrease, and the heights of the protrusions 193c and 194a become smaller. 194c, but the present invention is not limited thereto. For example, when forming protrusions with two different heights, large protrusions 193a and 194a are formed on the upstream side of the gas flow path 170a, and small protrusions 193c and 194a are formed on the downstream side. It is only necessary to form the shaped portion 194c, and there is no need to gradually change the size.

In the first to third embodiments described above, a muffler is shown having a wave-shaped wall surface in which a gentle protrusion and a gentle concave part are continuously repeated. The portions are not limited to the shapes shown in FIGS. 1-4. For example, by forming a plurality of protrusions protruding in a semi-cylindrical shape, a concave portion may be formed between adjacent protrusions. Further, by forming a plurality of semi-cylindrical concave portions, a protrusion may be formed between adjacent concave portions. Further, the shapes of the protrusions and depressions are not particularly limited, and various shapes such as a V-shaped cross section and a quadrangular prism shape can be selected.

Further, in the first to third embodiments, the bottom member 162 is arranged so that the bottom portion 162a is horizontal, and the lid member 169 is arranged thereon, but the present invention is not limited to this. For example, the molded body 161, molded body 181, or molded body 191 can be used after being rotated 90° clockwise or counterclockwise from the position shown in FIGS. 1, 3, and 4. 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.

(Fourth embodiment)
FIG. 5 is a sectional view schematically showing a molded body of a silencer for a combustion device according to a fourth embodiment of the present invention, and FIG. 6 is a sectional view schematically showing the structure of the molded body of a silencer for a combustion device shown in FIG. FIG.

The molded body 121 includes a gas inlet 111 into which combustion gas discharged from the combustion device is introduced, a gas outlet 172 through which the combustion gas is discharged to the outside, and a gas inlet 111 that communicates the gas outlet 111 with the gas outlet 172. The box body 120 has an assembled structure in which flow paths 20a, 20b, 20c, 20d, and 20e are provided.
Further, inside the box body 120, a partition plate 106 in which an opening 113 is formed and a partition plate 107 in which an opening 114 is formed are arranged substantially in parallel with a desired interval. The opening 113 of the partition plate 106 is formed close to the wall of the box body 120 on the gas inlet 111 side, and the opening 114 of the partition plate 107 is formed close to the wall of the box body 120 on the gas outlet 172 side. Formed close to the wall.

Hereinafter, with reference to FIG. 6, the structure of the molded body of the silencer for a combustion device according to the fourth embodiment will be described in further detail.
The rectangular parallelepiped-shaped molded body 121 is obtained by laminating a bottom member 162, a first frame member 103, a second frame member 104, and a lid member 105 in this order.

The bottom member 162 has a vessel shape having a rectangular bottom 162a and wall portions 162b rising from the four sides of the bottom portion 162a, and a gas outlet 172 is formed by providing a cutout in a part of the wall portion 162b. There is. Further, on the gas flow path 170a side surface (first wall surface 183) of the bottom portion 162a of the bottom member 162, a protruding portion 183a and a recessed portion 183b extending in a direction perpendicular to the direction in which the combustion gas 8 flows are repeatedly formed. The first wall surface 183 has a continuous wave shape.

The first frame member 103 is vessel-shaped and includes a rectangular partition plate 106 serving as a bottom surface and wall portions 103b rising from the four sides of the partition plate 106. However, the opening 113 is formed in the partition plate 106 at a position close to the surface opposite to the surface on which the gas discharge port 172 is formed. Furthermore, the partition plate 106 has a corrugated plate shape in which protrusions and recesses extending in a direction perpendicular to the direction in which the combustion gas 8 flows are repeated.
Specifically, the surface of the partition plate 106 on the gas flow path 20e side has a recessed part 135b having a semi-cylindrical shape and a protruding part 135a formed between adjacent recessed parts 135b, which are repeated. The surface of the partition plate 106 on the gas flow path 20c side has repeated gentle protrusions 134a and gentle concave parts 134b, and the partition plate 106 as a whole has a corrugated plate shape.

Note that the bottom surface of the first frame member 103 has the same outer dimensions as the peripheral end surface 162c of the wall portion 162b of the bottom member 162, so that when the first frame member 103 is stacked on the bottom member 162, both are securely connected. It is designed to overlap.

The second frame member 104 is vessel-shaped and includes a rectangular partition plate 107 serving as a bottom surface and wall portions 104b rising from the four sides of the partition plate 107. However, in the wall portion 104b, a gas inlet 111 is formed by cutting out a part of the surface opposite to the surface on which the gas outlet 172 is formed. Furthermore, an opening 114 is formed in the partition plate 107 at a position close to the surface opposite to the surface on which the gas inlet 111 is formed. Furthermore, the partition plate 107 has a corrugated plate shape in which protrusions and recesses extending in a direction perpendicular to the direction in which the combustion gas 8 flows are repeated.
Specifically, the surface of the partition plate 107 on the gas flow path 20c side has a recessed part 133b having a semi-cylindrical shape and a protruding part 133a formed between adjacent recessed parts 133b, which are repeated. The surface of the partition plate 107 on the gas flow path 20a side has a repeated gentle protruding portion 132a and a gentle concave portion 132b, and the partition plate 107 as a whole has a corrugated plate shape.

Note that the bottom surface of the second frame member 104 has the same outer dimensions as the peripheral end surface 103c of the wall portion 103b of the first frame member 103, and the second frame member 104 is laminated on the first frame member 103. Sometimes the two are designed to ensure that they overlap.

The lid member 105 has a rectangular plate shape, and a protruding portion 131a and a recessed portion 131b extending in a direction perpendicular to the direction in which the combustion gas 8 flows are repeatedly formed on the surface on the gas flow path 20a side. The surface on the flow path 20a side has a continuous wave shape.
Note that the lid member 105 has the same outer dimensions as the peripheral end surface 104c of the wall portion 104b of the second frame member 104, so that when the lid member 105 is stacked on the second frame member 104, the two will surely overlap. It is designed to.
That is, the gas flow path 20a has a pair of opposing first and second wall surfaces 132 and 131, the gas flow path 20c has a pair of opposing first and second wall surfaces 134 and 133, and the gas flow path 20e has a pair of opposing first and second wall surfaces 134 and 133. has a pair of opposing first and second wall surfaces 183 and 135. Each wall surface has a wavy shape in which protrusions and recesses are repeatedly formed.

Further, the protruding portion 132a of the first wall surface 132 and the protruding portion 131a of the second wall surface 131 constituting the gas flow path 20a are formed at the same position in a plan view. Similarly, the protruding portion 134a of the first wall surface 134 and the protruding portion 133a of the second wall surface 133 constituting the gas flow path 20c are formed at the same position in plan view. Further, the protruding portion 183a of the first wall surface 183 and the protruding portion 135a of the second wall surface 135 constituting the gas flow path 20e are formed at the same position in plan view.

As described above, the bottom member 162, the first frame member 103, the second frame member 104, and the lid member 105 are stacked in this order to form a molded body 121, and this molded body 121 is a metal casing. (not shown) to constitute a muffler. Note that this housing has openings at positions corresponding to the gas inlet 111 and gas outlet 172 of the molded body 121 when the molded body 121 is stored, and the other parts are completely closed to the molded body. It has a shape that covers 121.

In the silencer configured in this manner, when the combustion gas 8 is introduced from the gas inlet 111, the combustion gas 8 flows through the gas flow path 20a between the lid member 105 and the partition plate 107, and the gas flow is By passing through the opening 114 serving as the path 20b, the combustion gas 8 bends and changes its traveling direction, and flows through the gas flow path 20c between the partition plate 107 and the partition plate 106. Thereafter, the combustion gas 8 is bent by passing through the opening 113 that becomes the gas flow path 20d, and further changes its traveling direction, thereby forming the gas flow path 20e between the partition plate 106 and the bottom 162a of the bottom member 162. It circulates and is discharged from the gas outlet 172.

Also in this embodiment, all the members constituting the gas flow paths 20a to 20e are made of materials containing inorganic fibers, and the first wall surface and the second wall surface have a wave shape, so that the combustion gas 8 is The gas passes through the gas channels 20a to 20e while colliding with the corrugated wall surface. Further, the opening 113 of the partition plate 106 and the opening 114 of the partition plate 107 are provided at different positions in plan view from the stacking direction, and the opening 114 is located at a position away from the gas inlet 111. is arranged and the opening 113 is arranged at a position away from the gas discharge port 172, so a long meandering gas flow path is formed compared to the first to third embodiments, which is even more superior. It is possible to obtain a sound deadening effect.
Furthermore, in this embodiment, a plurality of protrusions 131a, 132a, 133a, 134a are provided at opposing positions of the first wall surface and the second wall surface that constitute the gas flow path 20a, the gas flow path 20c, and the gas flow path 20e. , 135a and 183a are formed, a portion of the combustion gas 8 repeatedly passes through the narrow flow path and the wide flow path. Therefore, compared to the first to third embodiments, it is possible to obtain an excellent silencing effect in a wider frequency range.

Further, in this embodiment, the uneven shapes of the partition plate 106 and the partition plate 107 are different on one side and the other side, and one side (the gas flow path 20c side of the partition plate 106 and the gas flow side of the partition plate 107) The radius of curvature of the protruding portion 134a and the protruding portion 132a on the side (path 20a side) is the same as that of the concave portion 135b and the concave portion on the other surface (the gas flow path 20e side of the partition plate 106 and the gas flow path 20c side of the partition plate 107). The radius of curvature is designed to be larger than that of 133b.
Thereby, the stress applied to the partition plates 106 and 107 can be alleviated. Furthermore, the gas flow path 20e and the gas flow path 20c including the surface where the concave portion 135b and the concave portion 133b are formed are different from the gas flow path 20e and the gas flow path 20c which include only the surface where the gentle protrusion portion 131a and the protrusion portion 132a are formed. Compared to the path 20a, the sound is scattered more easily, so that a sound deadening effect can be obtained.

The molded body 121 is made up of four members: a bottom member 162, a first frame member 103, a second frame member 104, and a lid member 105, all of which have a simple structure and are stacked (stacked). ) 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.

In this embodiment, each member constituting the molded body 121 is made of a material including, for example, the above-mentioned inorganic fibers and a binder made of a thermosetting resin, in the same manner as in the first to fourth embodiments. Each can be integrally molded by suction filtering into a mold formed into a desired shape and drying. Note that the corrugated plate shape of the partition plate 106 and the partition plate 107 can be formed by providing a plurality of semi-cylindrical protrusions extending in a desired direction on the surface of the mold for suction filtration.

Further, in the fourth embodiment, the protrusions formed on the pair of opposing first and second wall surfaces are formed at the same positions in plan view, but the present invention is not limited to this. Instead, the protruding portion on the first wall surface and the concave portion on the second wall surface may be formed at a matching position. With such a configuration, it is possible to obtain the same effect as in the first embodiment, and the combustion proceeds toward the gas outlet 172 while meandering little by little within the gas flow paths 20a to 20e, which are the main flow directions. Gas passes through. Therefore, the apparent length of the gas flow path can be further increased, and an excellent silencing effect can be obtained.

Further, in the first to third embodiments, a silencer without a frame member and a partition plate was shown, and in the fourth embodiment, an example was shown in which two frame members (frame member 103 and frame member 104) were used. However, the present invention is not limited to this, and the silencer of the present invention can be configured with one frame member or with three or more frame members.
For example, in the case of one frame member, the bottom member 162, second frame member 104, and lid member 105 shown in FIGS. 5 and 6 are used, and the second frame member 104 is laminated on the bottom member 162. When doing so, the gas inlet 111 is arranged in the same direction as the gas outlet 172. As a result, the combustion gas introduced from the gas inlet 111 flows through the gas flow path between the lid member 105 and the partition plate 107, and after passing through the opening 114, it is bent and changes its traveling direction. The gas flows through the gas flow path between the partition plate 107 and the bottom part 162a of the bottom member 162, and is discharged from the gas outlet 172.

In addition, when configured with three frame members, the bottom member 162 shown in FIG. 2, the first frame member 103, a frame member (not shown) having the same shape as the first frame member 103, A frame member 104 and a lid member 105 are used, and the gas inlets 111, the openings of adjacent frame members, and the gas exhaust ports 172 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 a similar manner, by increasing the number of frame members having the same shape as the first frame member 103, the gas flow path can be easily extended.
In either case, the pair of first and second wall surfaces constituting the gas flow path are formed with a wave shape in which protrusions and recesses are repeated, so that an excellent sound deadening effect can be obtained. be able to.

In addition, in the case of configuring with three or more frame members, the gas flow path can be extended by using a plurality of frame members having the same shape as the first frame member 103, as described above. There is no need to prepare a mold for manufacturing frame members of other shapes. 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 the fourth embodiment, the bottom member 162, the first frame member 103, the second frame member 104, and the lid member 105 were manufactured using molds with four different shapes. , a bottom member is manufactured by manufacturing a container-shaped member in which the gas inlet 111, the opening, and the gas outlet 172 are not formed, and cutting out the gas inlet, opening, gas outlet, etc. at necessary locations. and frame members can be manufactured. Therefore, the silencer can be manufactured with an extremely small number of molds. In addition, when each member of the molded body 121 is molded using a common mold in this way, the outer surface of the bottom member 162 (the surface opposite to the channel 20e side) and the outer surface of the lid member 105. A concave portion is also formed on the surface (the surface opposite to the flow path 20a side), but since the molded body 121 is eventually stored in the casing, this does not affect the effects of the present invention. .

Furthermore, in the fourth embodiment, the lid member 105 having a wavy shape in which the protruding portions 131a and the recessed portions 131b are repeatedly formed is laminated as the top layer, but the present invention does not necessarily require laminating the lid member 105. There isn't. For example, the molded body 121 is stored in a metal casing, but the bottom member 162, frame members 103, and frame members 104 are stored in a metal container with an open top, and the lid member 5 is not stacked and is made of metal. By closing with a lid made of aluminum, it is possible to obtain the same function as in the fourth embodiment.

Furthermore, in the fourth embodiment, the bottom member 162 is arranged so that the bottom part 162a is horizontal, and the frame member 103 and the frame member 104 are placed on top of it so that the partition plate 106 and the partition plate 107 are horizontal. Although the structure is such that the lid member 105 is further laminated, the present invention is not limited thereto. For example, the molded body 121 can be used while being rotated 90 degrees clockwise or counterclockwise, so even if the combustion gas outlet is formed above or below the combustion device, The silencer for combustion equipment according to the present invention can be installed.

Note that in the first to fourth embodiments, the protruding portion and the concave portion extend in a direction perpendicular to the direction in which the combustion gas flows, but in the present invention, the protruding portion and the recessed portion extend completely in the direction in which the combustion gas flows. The directions do not have to be orthogonal. In addition, the protrusions and recesses do not need to be formed to extend over the entire area in the direction perpendicular to the direction in which combustion gas flows (width direction of the box body); The effects of the present invention can be obtained even when the

Furthermore, in the first to fourth embodiments, the height of the protrusion provided on the first wall surface is opposite to the height of the protrusion portion provided on the second wall surface, or the protrusion portion is provided at a position that is half phase shifted from the opposing position. The sum of the height of the protrusion and the height of the gas flow path is preferably 15 to 40%, more preferably 25 to 33%. The height of the protrusion in the present invention is as described above. In addition, the height of the gas flow path is defined as a position where the protruding part of the first wall surface and the protruding part of the second wall surface coincide in plan view (in the second to fourth embodiments shown in FIGS. 3 to 6). (in the case of a shape), it refers to the distance between the bottom surfaces of concave portions adjacent to the protruding portion to be measured. However, if the protruding part of the first wall surface and the concave part of the second wall surface match in plan view (in the case of the first embodiment shown in FIGS. 1 and 2), the first wall surface The distance between the bottom surfaces of the concave portions is calculated by assuming that the combustion gas is shifted by half a phase in the direction of flow, and that the protruding portions of the first wall surface and the protruding portions of the second wall surface are at the same position in plan view. The height of the gas flow path.

8 Combustion gases 20a, 20b, 20c, 20d, 20e, 170a Gas channels 103, 104 Frame members 105, 169 Lid members 106, 107 Partition plates 111, 171 Gas inlets 113, 114 Openings 120, 160 Box body 121, 161, 181, 191 Molded body 131a, 132a, 133a, 134a, 135a, 173a, 183a, 193a, 193c Projecting portion 131b, 132b, 133b, 134b, 135b, 173b, 183b, 193b, 193d Recessed portion 162 Bottom member 172 Gas outlet 175, 176 virtual surface

Claims (10)

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. It has a box body provided with
The wall surface constituting the gas flow path is made of a material containing inorganic fibers,
The gas flow path has at least a pair of opposing first and second wall surfaces,
The first wall surface and the second wall surface have a wave shape in which protrusions and recesses extending in a direction substantially perpendicular to the direction in which the combustion gas flows are repeated;
When the protruding part of the first wall surface and the protruding part of the second wall surface match in plan view, the distance between the bottom surfaces of the concave parts adjacent to the protruding part to be measured is Let the distance be the height of the gas flow path,
When the protruding portion of the first wall surface and the concave portion of the second wall surface match in plan view, the first wall surface is shifted by half a phase in the direction in which combustion gas flows, and The height of the gas flow path is defined as the distance between the bottom surfaces of the concave portion assuming that the protruding portion of the first wall surface and the protruding portion of the second wall surface are at the same position in plan view. ,
The sum of the height of the protruding portion provided on the first wall surface and the height of the protruding portion provided on the second wall surface at an opposing position or a position shifted by half a phase from the opposing position. The muffler for a combustion device , wherein the protruding portion is formed so that the height is 15 to 40% of the height of the gas flow path . 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. It has a box body provided with
The wall surface constituting the gas flow path is made of a material containing inorganic fibers,
The gas flow path has at least a pair of opposing first and second wall surfaces,
The first wall surface and the second wall surface have a wave shape in which protrusions and recesses extending in a direction substantially perpendicular to the direction in which the combustion gas flows are repeated;
The difference in height between the apex of the protruding portion on the first wall surface and the second wall surface and the bottom point of the concave portion adjacent to the protruding portion becomes smaller as it approaches the gas outlet from the gas inlet. A silencer for combustion equipment , which is formed to be . 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. It has a box body provided with
The wall surface constituting the gas flow path is made of a material containing inorganic fibers,
The gas flow path has at least a pair of opposing first and second wall surfaces,
The first wall surface and the second wall surface have a wave shape in which protrusions and recesses extending in a direction substantially perpendicular to the direction in which the combustion gas flows are repeated;
A partition plate having an opening for bending the gas flow path is formed inside the box,
The partition plate has a corrugated plate shape in which the concave portion and the protruding portion extending in a direction substantially perpendicular to the direction in which the combustion gas flows are repeated;
The first wall surface and the second wall surface are constituted by either an inner wall surface of the box body or a surface of the partition plate,
The protruding portion on one surface of the partition plate and the concave portion on the other surface of the partition plate are formed at positions corresponding to each other,
A silencer for a combustion device , wherein a radius of curvature of the protruding portion and a radius of curvature of the concave portion are different from each other . When viewed in plan from a direction in which the first wall surface and the second wall surface face each other, the protruding portion of the first wall surface and the concave portion of the second wall surface are formed at substantially coincident positions; A silencer for a combustion device according to any one of claims 1 to 3 . When viewed in plan from a direction in which the first wall surface and the second wall surface face each other, the protruding portion of the first wall surface and the protruding portion of the second wall surface are formed at substantially coincident positions. A silencer for a combustion device according to any one of claims 1 to 3 . When the surface connecting the vertices of the protrusions on the first wall surface is defined as a first virtual surface, and the surface connecting the vertices of the protrusions on the second wall surface is defined as a second virtual surface, the first virtual surface is The silencer for a combustion device according to claim 4 or 5 , wherein the silencer is located closer to the first wall surface than the second virtual plane. The box body and the partition plate are made of a material containing inorganic fibers,
The muffler for a combustion device according to claim 3 , wherein a part of the box and the partition plate are integrally formed. 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 7 , 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,
9. The noise reduction device for a combustion device according to claim 8 , 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 8 or 9 .

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