JP6269151B2 - Combustion device - Google Patents

Description

  The present invention relates to a combustion apparatus, and more particularly to a combustion apparatus capable of exhausting combustion gas.

  Conventionally, a reverse combustion type combustion apparatus that burns fuel sprayed from the top to the bottom has been used. In this reverse combustion type combustion apparatus, combustion air is supplied from the blower from the top to the bottom of the burner, and combustion gas is supplied from the top to the bottom by burning the fuel sprayed downward in the burner. The The combustion gas passes through the collecting cylinder disposed below the burner, flows into the silencer disposed above the collecting cylinder, and is exhausted out of the combustion apparatus through an exhaust port communicating with the silencer.

  In this combustion apparatus, when the combustion gas passes through the silencer, noise when the combustion gas is exhausted from the exhaust port can be reduced. However, it is not possible to reduce the noise caused by the combustion gas in the path from the burner to the silencer. For this reason, it has been proposed to provide a sound absorbing material in the collecting cylinder.

  For example, Japanese Patent Laid-Open No. 2000-74500 (Patent Document 1) includes a multi-layer structure in which a bottom portion of a collecting cylinder has a first bottom and a second bottom, and an inner side of the first bottom and a first bottom and a second bottom. A combustion apparatus in which a sound absorbing material is provided in a space between the two is disclosed.

JP 2000-74500 A

  However, in the combustion apparatus described in the above publication, the sound absorbing material is not fixed at the bottom. For this reason, there exists a problem that an assembly cylinder is difficult to assemble. In addition, the position of the sound absorbing material may be easily shifted when the assembly cylinder is assembled. For this reason, there is also a problem that a sufficient silencing effect cannot be obtained.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a combustion apparatus that is easy to assemble and can provide a sufficient silencing effect.

  The combustion apparatus of the present invention is capable of exhausting combustion gas, and includes a casing, a burner, and a collecting cylinder. The housing has an exhaust port for exhausting combustion gas. The burner is disposed in the housing and supplies combustion gas. The collecting cylinder is disposed in the housing, has a case member, and is configured so that the combustion gas supplied by the burner is introduced into the internal space surrounded by the case member and guided from the internal space to the exhaust port. Has been. The collecting cylinder includes first and second sound absorbing materials and a sound absorbing material positioning member. The first sound absorbing material is disposed in the internal space and has a first recess. The second sound absorbing material is disposed in the internal space and has a second recess. The sound-absorbing material positioning member is disposed in the internal space, and is sandwiched between the first sound-absorbing material and the second sound-absorbing material, and a first convex portion that engages with the first concave portion, And a second convex portion that engages with the two concave portions.

  According to the combustion apparatus of the present invention, in the state where the sound absorbing material positioning member is sandwiched between the first sound absorbing material and the second sound absorbing material, the first convex portion of the sound absorbing material positioning member is the first sound absorbing material. The second concave portion of the sound absorbing material positioning member is engaged with the second concave portion of the second sound absorbing material. For this reason, the first sound absorbing material and the second sound absorbing material can be fixed by the sound absorbing material positioning member. Thereby, a 1st sound absorbing material and a 2nd sound absorbing material can be positioned mutually. Therefore, since the first sound absorbing material and the second sound absorbing material are positioned by the sound absorbing material positioning member, the assembly cylinder can be easily assembled. Further, it is possible to make it difficult to shift the positions of the first and second sound absorbing materials when the assembly cylinder is assembled. For this reason, a sufficient silencing effect can be obtained.

  In the combustion apparatus described above, the first concave portion is formed of a first groove that penetrates the first sound absorbing material in a direction in which the sound absorbing material positioning member and the first sound absorbing material overlap. The second recess includes a second groove penetrating the second sound absorbing material in a direction in which the sound absorbing material positioning member and the second sound absorbing material overlap. The 1st convex part consists of the 1st claw inserted in the 1st slot. A 2nd convex part consists of a 2nd nail | claw fitted in a 2nd groove | channel. Therefore, the first sound absorbing material and the second sound absorbing material can be fixed by fitting the first claw into the first groove and the second claw into the second groove.

  The combustion apparatus further includes a sound absorbing material fixing member that sandwiches the second sound absorbing material between the sound absorbing material positioning member. At least one of the first and second sound absorbing materials has a third recess. In the sound absorbing material fixing member, the sound absorbing material positioning member is sandwiched between the first sound absorbing material and the second sound absorbing material, the first convex portion is engaged with the first concave portion, and the second convex portion is engaged with the second concave portion. In a state where the two convex portions are engaged, a third convex portion that engages with the third concave portion is provided. For this reason, the first and second sound absorbing materials can be fixed to the sound absorbing material fixing member by engaging the third convex portion with the third concave portion. Further, the first and second sound absorbing materials can be positioned with respect to the sound absorbing material fixing member.

  In the combustion apparatus described above, the outer wall portion includes a bottom portion and a side portion that rises from the bottom portion. At least one of the first and second sound-absorbing materials is disposed along both the bottom and the side. For this reason, the noise of the combustion gas is absorbed by at least one of the first and second sound absorbing materials in both the bottom portion and the side portion. Thereby, a sufficient silencing effect can be obtained.

  In the above combustion apparatus, the third convex portion is disposed along the side portion. By engaging the third concave portion with the third convex portion, it is possible to position one of the first and second sound absorbing materials along the side portion.

  As described above, according to the present invention, it is possible to provide a combustion apparatus that is easy to assemble and can provide a sufficient silencing effect.

It is a schematic diagram showing roughly the composition of the combustion device in one embodiment of the present invention. It is a perspective view which shows roughly the structure of the collection cylinder in one embodiment of this invention. FIG. 3 is an exploded perspective view schematically showing the configuration of the collecting cylinder in FIG. 2. It is sectional drawing which follows the IV-IV line of FIG. It is a perspective view which shows roughly a mode that the 1st and 2nd sound absorption material in one embodiment of this invention is fixed to the sound absorption material positioning member. It is a perspective view which shows roughly a mode that the 1st and 2nd sound absorption material in one embodiment of this invention is fixed to the sound absorption material fixing member. It is a perspective view which shows roughly a mode that the 1st and 2nd sound absorption material fixed to the sound absorption material fixing member in one embodiment of this invention is inserted in a case member. It is a perspective view showing roughly the state where the 1st and 2nd sound-absorbing materials fixed to the sound-absorbing material fixing member in one embodiment of the present invention were inserted in the case member.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First, the structure of the combustion apparatus of this Embodiment is demonstrated. The combustion apparatus of the present embodiment is a combustion apparatus that can exhaust combustion gas.

  Referring to FIG. 1, a combustion apparatus 1 according to the present embodiment includes a housing 2, a burner 3, a blower 4, a heat exchanger 5, a water supply pipe 6, a water inlet 6 a, a hot water supply pipe 7, It has mainly a gate 7a, a silencer 8, and a collecting cylinder 10.

  The housing 2 is configured to accommodate a burner 3, a blower 4, a heat exchanger 5, a water supply pipe 6, a hot water supply pipe 7, a silencer 8, and a collecting cylinder 10 inside. The housing 2 has an exhaust port EP on the front surface. The exhaust port EP is for exhausting the combustion gas generated in the burner 3, sent to the heat exchanger 5 by the blower 4 and then reaching the silencer 8 through the collecting cylinder 10. The exhaust port EP is configured to be able to exhaust the combustion gas whose heat has been recovered by the heat exchanger 5 to the outside of the housing 2. The exhaust port EP communicates with the silencer 8. Further, a water inlet 6a for water supply and a hot water outlet 7a for hot water supply are provided on the side surface of the housing 2.

  The burner 3 is for supplying combustion gas. The burner 3 is disposed below the blower 4 in the housing 2. The burner 3 generates combustion gas for heat exchange with the heat exchanger 5 and supplies the combustion gas to the heat exchanger 5. The burner 3 is a reverse combustion type device in which liquid fuel such as kerosene is sprayed downward and burned. Specifically, the burner 3 is, for example, a gun type burner.

  The blower 4 is for supplying air necessary for combustion to the burner 3. The blower 4 is disposed above the burner 3 in the housing 2. The blower 4 is configured to be able to supply combustion air from above the burner 3 downward. Specifically, the blower 4 is a fan, for example.

  The heat exchanger 5 is a sensible heat recovery type heat exchanger. Hot water in the heat exchanger 5 is heated by heat exchange with the high-temperature combustion gas. The heat exchanger 5 is disposed below the burner 3 in the housing 2. A water supply pipe 6 is connected to one end of the heat exchanger 5, and a hot water supply pipe 7 is connected to the other end of the heat exchanger 5.

  The water inlet 6 a is connected to the water supply pipe 6 and configured to be able to supply water to the heat exchanger 5 through the water supply pipe 6. The hot water outlet 7 a is connected to the hot water supply pipe 7 and configured to be able to supply hot water heated by the heat exchanger 5. As a result, the water supplied from the water inlet 6 a is heated by the combustion gas when passing through the heat exchanger 5 via the water supply pipe 6 and supplied from the hot water outlet 7 a via the hot water supply pipe 7.

  The silencer 8 and the collecting cylinder 10 constitute a combustion gas flow path connected in series. The silencer 8 is a device for absorbing noise caused by combustion gas and muting it. The silencer 8 has a sound absorbing material inside. The silencer 8 is located on the downstream side of the collecting cylinder 10 in the housing 2. The silencer 8 is disposed above the collective cylinder 10. The silencer 8 extends from the collecting cylinder 10 toward the upper surface of the housing 2. The silencer 8 is connected to the exhaust port EP at the top.

  The collecting cylinder 10 is located on the downstream side of the heat exchanger 5 in the housing 2. The collecting cylinder 10 is disposed below the heat exchanger 5 in the housing 2. The collecting cylinder 10 extends in the lateral direction from one side surface side of the housing 2 toward the other side surface side. The collective cylinder 10 is connected to the heat exchanger 5 on one side surface of the housing 2 and is connected to the silencer 8 on the other side surface of the housing 2.

  As indicated by arrows in FIG. 1, the combustion gas generated in the burner 3 is sent downward by the blower 4. The fuel gas passes around the heat exchanger 5 and exchanges heat with water in the heat exchanger 5, and then is sent to the silencer 8 through the collecting cylinder 10. That is, the combustion gas generated in the burner 3 is guided to the silencer 8 through the heat exchanger 5 so as to make a U-turn in the collecting cylinder 10. The fuel gas sent to the silencer 8 passes through the silencer 8 and is discharged out of the housing 2 from the exhaust port EP.

  With reference to FIG. 2 and FIG. 3, the structure of the collection cylinder 10 of this Embodiment is demonstrated in detail. The collective cylinder 10 mainly includes a case member 11, a first sound absorbing material 12, a sound absorbing material positioning member 13, a second sound absorbing material 14, a sound absorbing material fixing member 15, and a support member 16. Yes. The collecting cylinder 10 has a case member 11. The collecting cylinder 10 is configured such that the combustion gas supplied by the burner 3 is introduced into the internal space surrounded by the case member 11 and is led from the internal space to the exhaust port EP.

  The case member 11 has a bottom part 11a and a side part 11b rising from the bottom part 11a. The case member 11 is configured to accommodate the first sound absorbing material 12, the sound absorbing material positioning member 13, the second sound absorbing material 14, and the sound absorbing material fixing member 15 in an internal space surrounded by the bottom portion 11a and the side portion 11b. Has been. Further, a flange portion 11c extending outward from the side portion 11b is provided at the upper end of the side portion 11b of the case member 11. The flange portion 11c is configured such that the support member 16 can be placed thereon.

  Each of the first sound absorbing material 12 and the second sound absorbing material 14 is a member that absorbs sound energy. The first sound absorbing material 12 and the second sound absorbing material 14 are each a porous material such as glass mat, glass wool, rock wool, and the like. In the present embodiment, the first sound absorbing material 12 and the second sound absorbing material 14 are glass mats. For this reason, the first sound absorbing material 12 and the second sound absorbing material 14 are not easily broken or frayed. Thereby, it is easy to arrange the first sound absorbing material 12 and the second sound absorbing material 14 as designed. Each of the first sound absorbing material 12 and the second sound absorbing material 14 has a substantially uniform thickness. The thickness of each of the first sound absorbing material 12 and the second sound absorbing material 14 is, for example, 5 mm.

  In the present embodiment, the first sound absorbing material 12 and the second sound absorbing material 14 have the same configuration. Thereby, the production efficiency of the first sound absorbing material 12 and the second sound absorbing material 14 can be improved. Note that the first sound absorbing material 12 and the second sound absorbing material can be formed of different dimensions and different materials, respectively.

  The first sound absorbing material 12 is disposed along the inner surface of the case member 11. The second sound absorbing material 14 is disposed between the first sound absorbing material 12 and the sound absorbing material positioning member 13. The first sound absorbing material 12, the sound absorbing material positioning member 13, and the second sound absorbing material 14 are sequentially stacked on the bottom 11 a of the case member 11 from the bottom. The first sound absorbing material 12 and the second sound absorbing material 14 are disposed along both the bottom portion 11 a and the side portion 11 b of the case member 11. That is, the first sound absorbing material 12 and the second sound absorbing material 14 cover the entire inner surface of the case member 11. It should be noted that at least one of the first and second sound absorbing materials only needs to be disposed along both the bottom portion 11a and the side portion 11b.

  The first sound absorbing material 12 has first recesses 12a to 12d. The first recesses 12 a to 12 d are disposed on the bottom 11 a of the case member 11. The first recesses 12a and 12c are disposed at both ends in the longitudinal direction of the first sound absorbing material 12, and are disposed so as to face each other. The first recesses 12b and 12d are arranged at both ends in the short direction of the first sound absorbing material 12, and are arranged so as to face each other.

  The second sound absorbing material 14 has second recesses 14a to 14d. The second recesses 14 a to 14 d are disposed on the bottom 11 a of the case member 11. The 2nd recessed parts 14a and 14c are arrange | positioned at the both ends of the longitudinal direction of the 2nd sound-absorbing material 14, and are arrange | positioned so that it may mutually oppose. The 2nd recessed parts 14b and 14d are arrange | positioned at the both ends of the transversal direction of the 2nd sound-absorbing material 14, and are arrange | positioned so that it may mutually oppose.

  Further, the first sound absorbing material 12 has third recesses 12e to 12h, and the second sound absorbing material 14 also has third recesses 14e to 14h. Each of the third recesses 12e to 12h is disposed so as to overlap with each of the third recesses 14e to 14h. It should be noted that at least one of the first and second sound absorbing materials 12 and 14 only needs to have the third recess.

  The third recesses 12e to 12h and 14e to 14h are arranged along the side portion 11b of the case member 11, respectively. The 3rd recessed parts 12e and 12g are arrange | positioned at the both ends of the longitudinal direction of the 1st sound-absorbing material 12, and are arrange | positioned so that it may mutually oppose. The 3rd recessed parts 12f and 12h are arrange | positioned at the both ends of the transversal direction of the 1st sound-absorbing material 12, and are arrange | positioned so that it may mutually oppose. The 3rd recessed parts 14e and 14g are arrange | positioned at the both ends of the longitudinal direction of the 2nd sound-absorbing material 14, and are arrange | positioned so that it may mutually oppose. The 3rd recessed parts 14f and 14h are arrange | positioned at the both ends of the transversal direction of the 2nd sound-absorbing material 14, and are arrange | positioned so that it may mutually oppose.

  In the present embodiment, the first recesses 12a to 12d, the second recesses 14a to 14d, and the third recesses 12e to 12h and 14e to 14h are slit grooves that penetrate the first sound absorbing material 12 in the thickness direction, respectively. is there. The first recesses 12a to 12d include first grooves 12a to 12d penetrating the first sound absorbing material 12 in the direction in which the sound absorbing material positioning member 13 and the first sound absorbing material 12 overlap. Here, the direction in which the sound absorbing material positioning member 13 and the first sound absorbing material 12 overlap is the direction in which the sound absorbing material positioning member 13 and the first sound absorbing material 12 are stacked, and intersects the bottom 11 a of the case member 11. Direction. The first grooves 12 a and 12 c extend in the short direction of the first sound absorbing material 12. The first grooves 12 b and 12 d extend in the longitudinal direction of the first sound absorbing material 12.

  The second recesses 14a to 14d are formed of second grooves 14a to 14d penetrating the second sound absorbing material 14 in the direction in which the sound absorbing material positioning member 13 and the second sound absorbing material 14 overlap. Here, the direction in which the sound-absorbing material positioning member 13 and the second sound-absorbing material 14 overlap is the direction in which the sound-absorbing material positioning member 13 and the second sound-absorbing material 14 are stacked, and intersects the bottom portion 11 a of the case member 11. Direction. The second grooves 14 a and 14 c extend in the short direction of the second sound absorbing material 14. The second grooves 14 b and 14 d extend in the longitudinal direction of the second sound absorbing material 14.

  The third recesses 12e to 12h extend in the direction in which the sound absorbing material positioning member 13 and the first sound absorbing material 12 overlap each other. The third recesses 14e to 14h extend in the direction in which the sound absorbing material positioning member 13 and the second sound absorbing material 14 overlap each other.

  The sound absorbing material positioning member 13 is arranged along the bottom portion 11 a above the bottom portion 11 a of the case member 11. The sound absorbing material positioning member 13 is made of metal, for example. In the present embodiment, the sound absorbing material positioning member 13 is formed of sheet metal. For this reason, the sound absorbing material positioning member 13 can insulate the sound from the second sound absorbing material 14 toward the first sound absorbing material 12.

  The sound absorbing material positioning member 13 is for positioning the first sound absorbing material 12 and the second sound absorbing material 14. The sound absorbing material positioning member 13 is configured to hold the first sound absorbing material 12 and the second sound absorbing material 14, respectively. The sound absorbing material positioning member 13 has first convex portions 13b and 13d and second convex portions 13a and 13c. The first protrusions 13b and 13d protrude toward the first sound absorbing material 12, and the second protrusions 13a and 13c protrude toward the second sound absorbing material 14. That is, the first protrusions 13b and 13d protrude downward, and the second protrusions 13a and 13c protrude upward.

  In a state where the sound absorbing material positioning member 13 is sandwiched between the first sound absorbing material 12 and the second sound absorbing material 14, the first convex portions 13b and 13d engage with the first concave portions 12b and 12d, respectively. The second convex portions 13a and 13c are configured to engage with the second concave portions 14a and 14c, respectively. In the present embodiment, the first convex portions are not inserted into the first concave portions 12a and 12c. However, the first convex portions may be added and inserted into the first concave portions 12a and 12c. it can. Moreover, although the 2nd convex part is not inserted in the 2nd recessed parts 14b and 14d, a 2nd convex part can also be added and inserted in the 2nd recessed parts 14b and 14b.

  In the present embodiment, the first protrusions 13b and 13d are composed of first claws 13b and 13d that fit into the first grooves 12b and 12d. The 1st convex parts 13b and 13d have the plate-shaped part extended thinly in the direction where the 1st groove | channels 12b and 12d extend. The 2nd convex parts 13a and 13c consist of the 2nd nail | claws 13a and 13c fitted in the 2nd groove | channels 14a and 14c. The 2nd convex parts 13a and 13c have the plate-shaped part extended thinly in the direction where the 2nd grooves 14a and 14c extend.

  A sound absorbing material fixing member 15 is disposed inside the second sound absorbing material 14. The sound absorbing material fixing member 15 sandwiches the second sound absorbing material 14 between the sound absorbing material positioning member 13. The sound-absorbing material fixing member 15 has third convex portions 15a to 15d on the side surfaces. The third protrusions 15a to 15d protrude outward from the side surfaces. The sound absorbing material positioning member 13 is sandwiched between the first sound absorbing material 12 and the second sound absorbing material 14, the first convex portions 13b and 13d are engaged with the first concave portions 12b and 12d, and the second In a state where the second convex portions 13a and 13c are engaged with the concave portions 14a and 14c, the third convex portions 15a to 15d are engaged with the third concave portions 12e to 12h and 14e to 14h.

  The 3rd convex parts 15a-15d consist of the nail | claw fitted in the 3rd recessed parts 12e-12h and 14e-14h. The 3rd convex parts 15a-15d are arrange | positioned along the side part 11b. Moreover, the 3rd convex parts 15a-15d have the plate-shaped part extended thinly in the direction where the 3rd recessed parts 12e-12h and 14e-14h extend. The sound-absorbing material fixing member 15 has notches 15e at the four corners and a plurality of through holes 15f at the bottom.

  The support member 16 is attached on the flange portion 11 c so as to cover the internal space of the case member 11. The support member 16 is disposed above the first sound absorbing material 12, the sound absorbing material positioning member 13, the second sound absorbing material 14, and the sound absorbing material fixing member 15 while being accommodated in the internal space. The support member 16 has through holes 16 a and 16 b communicating with the internal space of the case member 11. The through hole 16a is configured to be connected to the heat exchanger 5 shown in FIG. 1, and the through hole 16b is configured to be connected to the silencer 8 shown in FIG.

  Further, referring to FIG. 4, the combustion gas flows downward from the through hole 16 a into the internal space of the collecting cylinder 10 via the heat exchanger 5. The combustion gas travels in the inner space of the collecting cylinder 10 in the longitudinal direction of the collecting cylinder 10 and is supplied to the silencer 8 upward from a through hole 16b (not shown).

Next, the manufacturing method of the collection cylinder of this Embodiment is demonstrated.
Referring to FIG. 5, the first sound absorbing material 12 and the second sound absorbing material 14 are arranged with the sound absorbing material positioning member 13 interposed therebetween.

  The first claws 13b and 13d are respectively inserted into the first grooves 12b and 12d of the first sound absorbing material 12 from the sound absorbing material positioning member 13 toward the first sound absorbing material 12. And the front-end | tip part of 1st nail | claw 13b, 13d is bend | folded so that the surface on the opposite side with respect to the 2nd sound-absorbing material 14 of the 1st sound-absorbing material 12 may be hold | suppressed, respectively. Thereby, the first sound absorbing material 12 is firmly fixed to the sound absorbing material positioning member 13.

  Further, the second claws 13a and 13c are inserted into the second grooves 14a and 14c of the second sound absorbing material 14 from the sound absorbing material positioning member 13 toward the second sound absorbing material 14, respectively. And the front-end | tip part of 2nd nail | claw 13a, 13c is bent so that the surface on the opposite side with respect to the 1st sound-absorbing material 12 of the 2nd sound-absorbing material 14 may be hold | suppressed, respectively. Thereby, the second sound absorbing material 14 is firmly fixed to the sound absorbing material positioning member 13. In this way, the first sound absorbing material 12 and the second sound absorbing material 14 are fixed to the sound absorbing material positioning member 13. For this reason, the shift | offset | difference of the 1st sound absorbing material 12 and the 2nd sound absorbing material 14 is suppressed.

  Next, referring to FIG. 6 and FIG. 7, the sound absorbing material is placed on the second sound absorbing material 14 in a state where the first sound absorbing material 12 and the second sound absorbing material 14 are fixed to the sound absorbing material positioning member 13. A fixing member 15 is attached. From the sound absorbing material fixing member 15 toward the second sound absorbing material 14, third convex portions 15a to 15d are inserted into the third concave portions 14e to 14h, respectively. And the front-end | tip part of 3rd convex part 15a-15d is bent so that the surface on the opposite side with respect to the 2nd sound-absorbing material 14 of the 1st sound-absorbing material 12 may be hold | suppressed, respectively. Since the first sound absorbing material 12 and the second sound absorbing material 14 are fixed by the sound absorbing material positioning member 13, it is easy to attach the first sound absorbing material 12 and the second sound absorbing material 14 to the sound absorbing material fixing member 15. It is. Further, the displacement of the first sound absorbing material 12 and the second sound absorbing material 14 from the sound absorbing material fixing member 15 is suppressed. In the present embodiment, each of the third convex portions 15a to 15d is inserted into the third concave portions 14e to 14h and also continuously inserted into the third concave portions 12e to 12h shown in FIG. As a result, the first sound absorbing material 12 and the second sound absorbing material 14 are formed along the outer shape of the sound absorbing material fixing member 15. Since the first sound absorbing material 12, the sound absorbing material positioning member 13, the second sound absorbing material 14, and the sound absorbing material fixing member 15 are integrated into the case member 11, the assembly is easy. Moreover, the shift | offset | difference at the time of an assembly can be suppressed.

  Next, referring to FIGS. 7 and 8, the first sound absorbing material 12 and the second sound absorbing material 14 attached to the sound absorbing material fixing member 15 are inserted into the internal space of the case member 11. Thereafter, the support member 16 is attached to the flange portion 11c of the case member 11, and the collective cylinder 10 shown in FIG. 2 is manufactured.

Next, the effect of the combustion apparatus 1 of this Embodiment is demonstrated.
The reverse combustion type combustion apparatus generates a swirling flow in the burner 3 in order to promote mixing of the sprayed fuel and the combustion air. This swirling flow is one of the causes of noise. Also, the combustion noise of the burner and the blowing noise of the blower cause noise.

  According to the combustion apparatus 1 of the present embodiment, the sound absorbing material positioning member 13 is sandwiched between the first sound absorbing material 12 and the second sound absorbing material 14, and the first sound absorbing material positioning member 13 has the first sound absorbing material positioning member 13. The convex portions 13 b and 13 d engage with the first concave portions 12 b and 12 d of the first sound absorbing material 12, and the second convex portions 13 a and 13 c of the sound absorbing material positioning member 13 are the second of the second sound absorbing material 14. Engages with the recesses 14a and 14c. For this reason, the first sound absorbing material 12 and the second sound absorbing material 14 can be fixed by the sound absorbing material positioning member 13. Thereby, the 1st sound absorbing material 12 and the 2nd sound absorbing material 14 can be positioned mutually. Therefore, since the first sound absorbing material 12 and the second sound absorbing material 14 are positioned by the sound absorbing material positioning member 13, the assembly cylinder 10 can be easily assembled. Further, it is possible to make it difficult to shift the positions of the first and second sound absorbing materials 12 and 14 when the assembly cylinder 10 is assembled. For this reason, a sufficient silencing effect can be obtained.

  Further, since the first sound absorbing material 12 and the second sound absorbing material 14 are overlapped via the sound absorbing material positioning member 13, the first and second sound absorbing materials 12 and 14 are attached to the case member 11. Sometimes it becomes difficult to form a gap in the corners (corners) of the first and second sound absorbing materials 12 and 14. Therefore, it is difficult for sound leakage from the first and second sound absorbing materials 12 and 14 and the noise reduction effect can be enhanced.

  Further, in the combustion apparatus 1 of the present embodiment, the first claws 13b and 13d are fitted into the first grooves 12b and 12d, and the second claws 13a and 13c are fitted into the second grooves 14a and 14c. Thus, the first sound absorbing material 12 and the second sound absorbing material 14 can be fixed.

  Moreover, in the combustion apparatus 1 of the present embodiment, the first and second protrusions 15a to 15d are engaged with the third recesses 12e to 12h and 14e to 14h, so that the sound absorbing material fixing member 15 has the first and second members. The sound absorbing materials 12 and 14 can be fixed. Further, the first and second sound absorbing materials 12 and 14 can be positioned with respect to the sound absorbing material fixing member 15.

  Further, in the combustion apparatus 1 of the present embodiment, the noise of the combustion gas is absorbed by the first and second sound absorbing materials 12 and 14 at both the bottom portion 11 a and the side portion 11 b of the case member 11. Thereby, a sufficient silencing effect can be obtained.

  Moreover, in the combustion apparatus 1 of this Embodiment, the 1st and 2nd sound-absorbing materials 12 and 14 are engaged by making the 3rd recessed parts 12e-12h and 14e-14h engage with the 3rd convex parts 15a-15d. Can be positioned along the side 11b of the case member 11.

  In the above description, the first convex portions 13b and 13d are engaged with the first concave portions 12b and 12d, respectively, and the second convex portions 13a and 13c are engaged with the second concave portions 14a and 14c, respectively. However, one each of the first convex portion and the first concave portion, and the second convex portion and the second concave portion may be provided. One third convex portion and one third concave portion may also be provided.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Combustion apparatus, 2 housings, 3 burner, 4 air blower, 5 heat exchanger, 6 water supply piping, 6a water inlet, 7 hot water supply piping, 7a hot water outlet, 8 silencer, 10 collecting cylinder, 11 case member, 11a bottom part, 11b Side part, 11c Flange part, 12 1st sound absorption material, 12a-12d 1st recessed part, 12e-12h, 14e-14h 3rd recessed part, 13 Sound absorption material positioning member, 13a, 13c 2nd convex part, 13b , 13d First convex part, 14 Second sound absorbing material, 14a to 14d Second concave part, 15 Sound absorbing material fixing member, 15a to 15d Third convex part, 16 Support member.

Claims (5)

A combustion device capable of exhausting combustion gas,
A housing having an exhaust port for exhausting the combustion gas;
A burner disposed in the housing for supplying the combustion gas;
The combustion gas supplied by the burner is introduced into an inner space surrounded by the case member, and is led from the inner space to the exhaust port. And a collecting cylinder configured in
The collecting cylinder is
A first sound-absorbing material disposed in the internal space and having a first recess;
A second sound absorbing material disposed in the internal space and having a second recess;
A first protrusion that is disposed in the internal space and that is sandwiched between the first sound absorbing material and the second sound absorbing material; And a sound absorbing material positioning member having a second convex portion engaged with the second concave portion. The first recess comprises a first groove penetrating the first sound absorbing material in a direction in which the sound absorbing material positioning member and the first sound absorbing material overlap.
The second recess comprises a second groove that penetrates the second sound absorbing material in a direction in which the sound absorbing material positioning member and the second sound absorbing material overlap.
The first convex portion includes a first claw that fits into the first groove,
2. The combustion apparatus according to claim 1, wherein the second convex portion includes a second claw that fits into the second groove. A sound absorbing material fixing member that sandwiches the second sound absorbing material with the sound absorbing material positioning member;
At least one of the first and second sound absorbing materials has a third recess,
The sound absorbing material fixing member has the sound absorbing material positioning member sandwiched between the first sound absorbing material and the second sound absorbing material, and the first convex portion engages with the first concave portion, The combustion apparatus according to claim 1, further comprising a third convex portion that engages with the third concave portion in a state in which the second convex portion is engaged with the second concave portion. The case member includes a bottom part and a side part rising from the bottom part,
The combustion apparatus according to claim 3, wherein at least one of the first and second sound absorbing materials is disposed along both the bottom portion and the side portion.   The combustion apparatus according to claim 4, wherein the third convex portion is disposed along the side portion.

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