JP2019196888A - Combustion device - Google Patents

Abstract

To provide a combustion device free from degradation of appearance by preventing contamination and color change of a housing surface.SOLUTION: In a combustion device 1 including windshield means 17 having a front wall 20 covering a front part of an exhaust port 5, on a front surface of the exhaust port 5 of a combustor 3 and opened at upper and lower surfaces, straightening means 21 for restricting a flowing direction of a combustion gas discharged from the exhaust port 5, is disposed between the exhaust port 5 and the windshield means 17, the straightening means 21 has a dogleg-shaped guide plate 24 for guiding the combustion gas discharged from the exhaust port 5 to a front upper part and an oblique front lower part, and an extension line L1 of a plate portion forming the dogleg shape of the guide plate 24 is formed into the shape not overlapped to a front wall 20 of the windshield means 17, so that the flow of the combustion gas can be directed not toward the front wall 20 of the windshield means 17 by the guide plate 24, and the combustion gas rebounds on the front wall 20 of the windshield means 17, thus the surface of the housing 2 positioned at upper and lower portions of the exhaust port 5 can be prevented from being contaminated, and color change by heat of the combustion gas can be also prevented, which prevent degradation of appearance.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a combustion apparatus in which a wind filter is attached to the front surface of an exhaust port.

  Conventionally, in this type, a wind remover is provided on the front side of the exhaust port that discharges combustion gas, and even if wind blows from the front side of the exhaust port to the exhaust port during combustion, Some have prevented the wind and the wind pressure applied to the exhaust port from becoming high, thereby preventing problems such as incomplete combustion and misfire. (For example, refer to Patent Document 1.)

JP 2006-133246 A

  By the way, in this conventional type, the combustion gas discharged from the exhaust port during combustion bounces off the windshield, flows to the housing side of the combustion device, hits the surface of the housing, and is near the exhaust port and above and below the exhaust port. There is a possibility that the surface of the casing of the combustion apparatus located at the position will be contaminated by soot contained in the combustion gas, or discoloration may occur due to the heat of the combustion gas, deteriorating the appearance.

  In order to solve the above-mentioned problems, the present invention provides a combustion apparatus according to claim 1, wherein the combustion apparatus includes a windshield device having a front wall covering the front of the exhaust port on the front surface of the exhaust port of the combustor and having upper and lower surfaces opened. A rectifying means for defining a flow direction of the combustion gas discharged from the exhaust port is provided between the exhaust port and the windshielding means, and the rectifying means obliquely forwards the combustion gas discharged from the exhaust port. The guide plate has a dogleg-shaped guide plate that guides upward and obliquely forward and downward, and the extension line of the plate portion that forms the dogleg shape of the guide plate does not overlap the front wall of the windshield means. .

  According to a second aspect of the present invention, the rectifying means has an overhanging plate that protrudes forward from the exhaust port and the guide plate.

  According to a third aspect of the present invention, the rectifying means includes a lower projecting plate projecting forward from the exhaust port and the guide plate.

  According to a fourth aspect of the present invention, the guide plate has an upper inclined plate extending obliquely forward and upward and a lower inclined plate extending obliquely downward and downward as the plate portion forming the character shape. When the first oblique line, which is substantially the same angle as the angle formed by the upper inclined plate with respect to the opening surface of the exhaust port, extends forward from the upper end of the exhaust port, It is assumed that the position is on one oblique line and on the same vertical plane as the tip of the upper inclined plate or a position ahead of the tip of the upper inclined plate.

  According to a fifth aspect of the present invention, the guide plate includes an upper inclined plate extending obliquely forward and upward and a lower inclined plate extending obliquely downward and downward as the plate portion forming the character shape. When the second oblique line that forms substantially the same angle as the angle formed by the lower inclined plate with respect to the opening surface of the exhaust port is extended from the lower end of the exhaust port to the front side, It is assumed that the position is on the two diagonal lines and on the same vertical plane as the tip of the lower inclined plate or a position ahead of the tip of the lower inclined plate.

  According to the first aspect of the present invention, the rectifying means has a dog-shaped guide plate for guiding the combustion gas discharged from the exhaust port diagonally forward and upward and obliquely forward and downward. By forming the extension of the plate to be formed so that it does not overlap the front wall of the wind venting means, the flow of combustion gas discharged from the exhaust port is slanted by the guide plate so that it does not face the front wall of the wind venting means. Since it can be directed forward and upward and diagonally forward and downward, the combustion gas exhausted from the exhaust port bounces off the front wall of the wind vent and flows to the housing side of the combustion device, and is located above and below the exhaust port. It is possible to prevent problems such as contamination of the body surface with soot contained in the combustion gas, or occurrence of discoloration due to the heat of the combustion gas, and the appearance is not impaired.

  According to the second aspect of the present invention, the rectifying means has an overhanging plate projecting forward from above the exhaust port and the guide plate, so that it tends to flow out from the exhaust port and directly upward. Since the flow of combustion gas can be prevented, there is no flow of combustion gas that goes out from the exhaust port and rises along the surface of the housing, soot that contains the surface of the housing located above the exhaust port in the combustion gas, etc. Can prevent problems such as contamination by the heat generated by the combustion gas or discoloration due to the heat of the combustion gas, without impairing the aesthetics, and preventing rainwater, etc. falling from above the combustion device from entering the exhaust port It can also be done.

  According to the third aspect of the present invention, the rectifying means has a lower projecting plate projecting forward from the exhaust port and the guide plate, so that the rectifying means flows out from the exhaust port and flows directly downward. Since the flow of combustion gas can be prevented, there is no flow of combustion gas that goes out from the exhaust port and descends along the surface of the housing, so that the surface of the housing located below the exhaust port is contained in the combustion gas, etc. Can prevent problems such as fouling or discoloration caused by the heat of the combustion gas, and does not impair the aesthetic appearance.

  According to a fourth aspect of the present invention, the guide plate includes an upper inclined plate extending obliquely forward and an upper inclined plate extending obliquely downward and downward as a plate portion forming a dogleg shape. When the first oblique line, which is substantially the same angle as the angle formed by the upper inclined plate with respect to the opening surface of the exhaust port, extends from the upper end of the exhaust port to the front side, the tip position of the outlet plate is on the first oblique line. In addition, by setting the position on the same vertical plane as the front end of the upper inclined plate or the position ahead of the front end of the upper inclined plate, the overhanging plate can guide rainwater or the like falling from above the combustion device. In front of the wind venting means, without dripping on the upper inclined plate, and reliably suppressing the intrusion of rainwater etc. into the exhaust port, without causing exhaust resistance obstructing the flow of combustion gas toward the diagonally upper front It is possible to discharge combustion gas smoothly outside without forming a strong flow of combustion gas toward the wall side. It is kill things.

  According to a fifth aspect of the present invention, the guide plate includes an upper inclined plate that extends obliquely forward and an upper inclined plate that extends obliquely downward and downward as a plate portion that forms a dogleg shape. When the second oblique line, which is substantially the same angle as the angle formed by the lower inclined plate with respect to the opening surface of the exhaust port, extends from the lower end of the exhaust port to the front side, the tip position of the outlet plate is above the second oblique line. In addition, exhaust gas that obstructs the flow of combustion gas that is directed obliquely forward and downward because the lower overhanging plate is positioned on the same vertical plane as the tip of the lower inclined plate or in front of the front end of the lower inclined plate. Without causing resistance, it is possible to smoothly discharge the combustion gas to the outside without forming a strong flow of the combustion gas toward the front wall side of the windshielding means.

The perspective view which shows the combustion apparatus of one Embodiment of this invention. The principal part disassembled perspective view of the combustion apparatus of the same embodiment. The schematic block diagram which shows the hot water heating system using the combustion apparatus of the same embodiment. The perspective view which shows a windshield. (A) The perspective view which shows a rectifier. (B) The longitudinal cross-sectional view of a rectifier. The principal part cross-sectional enlarged view of the combustion apparatus of the same embodiment.

  Next, a combustion apparatus according to an embodiment of the present invention will be described with reference to the drawings. In this embodiment, the case where the combustion apparatus is used in a hot water heating system is described.

  1 is an outdoor installation type combustion apparatus of the present embodiment, 2 is a casing of the combustion apparatus 1, and 3 is a combustor that is accommodated in the casing 2 and heats a fluid to be heated.

  The housing 2 includes a front plate 2a, a top plate 2b, a side plate 2c, and a bottom plate 2d. A hole 4 is formed in the upper portion of the front plate 2a, and an exhaust port 5 of the combustor 3 is provided. The combustion gas generated in the combustor 3 is discharged to the outside through the exhaust port 5 so as to face the hole 4. An air supply port (not shown) for taking air into the combustion device 1 is provided at an appropriate location on the housing 2, for example, the side plate 2c.

  The combustor 3 receives the combustion air supplied from the blower fan 6 and burns the fuel, and recovers sensible heat from the combustion gas generated by the combustion of the burner 7 and circulates through the heat receiving pipe 8. Fin tube type heat exchanger 9 for heating a fluid to be heated such as an antifreeze liquid, an exhaust collecting chamber 10 through which the combustion gas after passing through the heat exchanger 9 circulates, and a combustion gas that has passed through the exhaust collecting chamber 10 And an exhaust part 11 having an exhaust port 5 for discharging the gas to the outside, and the exhaust port 5 as an opening formed at the most downstream in the combustion gas flow direction of the exhaust part 11 is an exhaust port of the combustor 3. This is equivalent to 5.

  Reference numeral 12 denotes a heat radiating terminal such as a floor heating panel or a panel convector for heating the air-conditioned space. Reference numeral 13 denotes a heat receiving terminal connected to the water inlet side of the heat receiving pipe 8 to receive the heated fluid returned from the heat radiating terminal 12. A return pipe 14 that leads to the heat pipe 8 connects the heat radiating terminal 12 and the water discharge side of the heat receiving pipe 8, and a forward pipe that guides the fluid to be heated heated by the heat exchanger 9 to the heat radiating terminal 12. A circulation pump 16 that circulates the heated fluid that is provided and heated by the heat exchanger 9 to the heat radiating terminal 12, and 16 is an air / water separator that is provided in the forward pipe 14 and separates air and liquid in the heated fluid.

  17 is attached to the exhaust part 11 on the surface where the exhaust port 5 is formed so as to be positioned on the front side of the exhaust port 5, and prevents wind blowing from the front side of the exhaust port 5 toward the exhaust port 5. As shown in FIG. 4, the wind remover 17 includes a left side wall 18 that covers the left side of the exhaust port 5 in the left-right width direction and has a mounting surface to the exhaust part 11. It has a right side wall 19 that covers the right side of the exhaust port 5 in the left-right width direction and has a mounting surface for the exhaust part 11, and a front wall 20 that covers the front of the exhaust port 5, and the left side wall 18 and the front wall 20 are curved. The right side wall 19 and the front wall 20 are also connected via a curved corner part, and the left side wall 18, the right side wall 19 and the front wall 20 are integrally formed, and the upper and lower surfaces are opened. When the windbreak device 17 is attached to the exhaust part 11, the windbreaker is substantially U-shaped. The front wall 20 of 17 is located so as to face the exhaust port 5 with a predetermined gap, and a space is formed between the exhaust port 5 and the front wall 20 of the windbreak plate 17, and upper and lower surfaces are opened. It will be in the state. The length in the vertical direction of the windbreaker 17 (the length from the lower end to the upper end of the windbreaker 17) is longer than the length of the exhaust port 5 (the length from the lower end to the upper end of the exhaust port 5), In a state where the wind vent 17 is attached to the front surface of the exhaust port 5, the lower end of the wind vent 17 is positioned below the lower end of the exhaust port 5, and the upper end of the wind vent 17 is higher than the upper end of the exhaust port 5. Is also located above.

  21 is provided between the exhaust port 5 and the wind vent 17 in the combustion gas discharge direction, and is attached to the exhaust part 11 on the surface where the exhaust port 5 is formed so as to be positioned on the front side of the exhaust port 5. The rectifier is a rectifier as a rectifier that regulates the flow direction of the combustion gas discharged from the exhaust port 5 to the outside. As shown in FIG. The upper inclined plate 22 that extends obliquely forward and upward toward the front and the front wall 20 side of the wind remover 17 that leads the combustion gas from the exhaust outlet 5 obliquely forward and upward extends obliquely forward and downward from the exhaust port 5. And a lower inclined plate 23 that guides the combustion gas obliquely forward and downward, and has a vertical cross-sectional shape in a side view for guiding the combustion gas discharged from the exhaust port 5 to the outside (see FIG. 5B). ), And the rectifying device 21 has an exhaust port 5 and a plan. Above the plate 24, below the exhaust plate 5 and the guide plate 24, and above the exhaust plate 5 extending substantially horizontally toward the front wall 20 of the wind remover 17, An underhanging plate 26 extending substantially horizontally toward the front wall 20 is provided. The upper projecting plate 25 projects so that its tip 25a is positioned in front of the tip 22a of the upper inclined plate 22 of the guide plate 24 in side view, and the lower projecting plate 26 is in side view. The tip 26a projects so as to be positioned forward of the tip 23a of the lower inclined plate 23 of the guide plate 24. The windshield 17 and the rectifier 21 may be fixed to the exhaust part 11 with screws, for example, or may be fixed by other methods such as welding.

Next, operation | movement of the combustion apparatus 1 of this one Embodiment is demonstrated.
When the start of operation of the combustion apparatus 1 is instructed by a remote controller (illustrated), combustion of the burner 7 is started upon receiving supply of combustion air from the blower fan 6, and the combustion gas generated by the combustion of the burner 7 is heated After passing through the exchanger 9, it flows into the exhaust collecting chamber 10, flows through the exhaust collecting chamber 10, and is discharged from the exhaust collecting chamber 10 to the outside of the combustion apparatus 1 through the exhaust port 5 of the exhaust unit 11. . The heated fluid supplied to the heat radiating terminal 12 circulates through the heat receiving pipe 8 by driving the circulation pump 15, is heated by heat exchange with the combustion gas in the heat exchanger 9, and travels from the heat receiving pipe 8. It is guided to the pipe 14 and supplied to the heat dissipation terminal 12.

  Here, with reference to FIG. 6, main parts in a state in which the rectifier 21 and the wind vent 17 are attached to the front surface of the exhaust port 5 will be described, and the combustion gas discharged from the exhaust port 5 to the outside of the combustion apparatus 1. The flow will be described.

  First, by providing the wind filter 17 on the front side of the exhaust port 5, even when wind blows from the front side (front side) of the exhaust port 5 toward the exhaust port 5 during combustion, By preventing the wind, the wind pressure applied to the exhaust port 5 is reduced, the combustion gas is smoothly discharged from the exhaust port 5, the combustion and ignition are stabilized, and incomplete combustion, misfiring, reignition failure, etc. are prevented. It is something that can be done.

  The rectifier 21 is arranged so that a guide plate 24 having a dogleg shape (in a reverse letter shape in FIG. 6) is positioned substantially at the center of the exhaust port 5 in the height direction (vertical direction). The front wall 20 is positioned closer to the front surface of the exhaust port 5, which is closer to the exhaust port 5. Then, the combustion gas discharged from the exhaust port 5 during combustion generates a flow that goes obliquely forward and upward along the upper inclined plate 22 and a flow that goes obliquely forward and downward along the lower inclined plate 23, The combustion gas discharged from the exhaust port 5 is guided outside by the guide plate 24 so as to be substantially divided into two.

  At this time, the U-shaped guide plate 24 is an imaginary extension line extending obliquely forward from the respective front ends 22a, 23a of the upper inclined plate 22 and the lower inclined plate 23 which are plate portions forming the U shape. L1 (refer to the broken line in FIG. 6) does not overlap the front wall 20 of the windbreaker 17 (in other words, each of the upper inclined plate 22 and the lower inclined plate 23 which are plate portions forming the character shape). The front wall 20 of the windbreak device 17 does not exist on the virtual extension line L1 extending obliquely forward from the tip), and the inclination angle of the character is set. By forming the shape with an angle, the flow of the combustion gas exhausted from the exhaust port 5 does not face the front wall 20 of the wind remover 17 (the back surface of the front wall 20). Oblique by guide plate 24 to avoid wall 20 (back side of front wall 20) Since it can be directed upward and obliquely forward and downward, the combustion gas discharged from the exhaust port 5 bounces back to the front wall 20 (the back surface of the front wall 20) of the wind vent 17 and the casing 2 of the combustion apparatus 1 The front plate 2a flows to the front plate 2a side, hits the surface of the front plate 2a, the surface of the front plate 2a located above and below the exhaust port 5 is contaminated by soot contained in the combustion gas, or discoloration due to the heat of the combustion gas occurs. It can be prevented and does not impair the aesthetics.

  Further, the rectifying device 21 is substantially above the exhaust port 5 and the guide plate 24 in the vertical direction, from the same vertical surface as the opening surface of the exhaust port 5 toward the front (the front wall 20 side of the windbreak device 17). An overhanging plate 25 that extends horizontally is provided, and a portion of the upper surface opening above the exhaust port 5 formed by providing the wind vent 17 on the front surface of the exhaust port 5 is closed. Thus, the flow of the combustion gas that flows out from the exhaust port 5 and flows directly upward can be prevented, so there is no flow of combustion gas that goes out from the exhaust port 5 and rises along the surface of the front plate 2a. It is possible to prevent problems such as the surface of the front plate 2a located above the exhaust port 5 being soiled by soot contained in the combustion gas, or the occurrence of discoloration due to the heat of the combustion gas, and the appearance is not impaired. , Falling from above the combustion device 1 Rainwater is one that can be prevented from entering the exhaust port 5.

  Further, the upper projecting plate 25 has a first oblique line L2 (in FIG. 6), the position of the tip 25a of which is substantially the same as the angle formed by the upper inclined plate 22 with respect to the same vertical plane as the opening surface of the exhaust port 5. ) When extending from the upper end of the exhaust port 5 (the upper end on the opening surface of the exhaust port 5) to the front side (the front wall 20 of the windbreaker 17), on the first oblique line L2, In addition, since the upper projecting plate 25 is positioned in front of the tip 22 a of the upper inclined plate 22, rainwater or the like that falls from above the combustion device 1 is caused on the upper inclined plate 22 of the guide plate 24. On the front wall 20 side of the windbreaker 17 without causing exhaust resistance that obstructs the flow of the combustion gas heading obliquely forward and upward while preventing drooping into the exhaust port 5 and reliably preventing rainwater and the like from entering the exhaust port 5. The exhaust gas can be discharged smoothly to the outside without creating a strong flow of It is kill things. Note that the angle formed by the first oblique line L2 is substantially the same as the angle formed by the upper inclined plate 22 with respect to the same vertical plane as the opening surface of the exhaust port 5. The angle formed by the inclined plate 22 with respect to the same vertical plane as the opening surface of the exhaust port 5 is defined as an angle within a range of ± 5 ° from the reference angle.

  Further, the rectifying device 21 is substantially below the exhaust port 5 and the guide plate 24 in the vertical direction and from the same vertical plane as the opening surface of the exhaust port 5 toward the front (the front wall 20 side of the wind vent 17). A horizontally extending lower projecting plate 26 is provided so as to block a portion of the lower opening near the exhaust port 5 below the exhaust port 5 formed by providing the wind vent 17 on the front surface of the exhaust port 5. Therefore, it is possible to prevent the flow of combustion gas from going out from the exhaust port 5 and flowing downward, so there is no flow of combustion gas going out from the exhaust port 5 and descending along the surface of the front plate 2a. It is possible to prevent problems such as the surface of the front plate 2a located below the exhaust port 5 being soiled by soot contained in the combustion gas, or the occurrence of discoloration due to the heat of the combustion gas, and the appearance is not impaired. .

  Furthermore, the lower overhanging plate 26 has a second oblique line L3 (in FIG. 6), the position of the tip 26a of which is substantially the same as the angle formed by the lower inclined plate 23 with respect to the same vertical plane as the opening surface of the exhaust port 5. 2) is extended from the lower end of the exhaust port 5 (the lower end on the opening surface of the exhaust port 5) to the front side (the front wall 20 of the windbreaker 17), and is on the second oblique line L3. In addition, since the lower overhanging plate 26 is positioned in front of the tip 23a of the lower inclined plate 23, the underhanging plate 26 does not become exhaust resistance that obstructs the flow of combustion gas toward the front and lower side of the lower inclined plate 23. The combustion gas can be smoothly discharged to the outside without forming a strong flow of the combustion gas toward the front wall 20 of the removal tool 17. The angle formed by the second oblique line L3 is substantially the same as the angle formed by the lower inclined plate 23 with respect to the same vertical plane as the opening surface of the exhaust port 5. The angle formed by the inclined plate 23 with respect to the same vertical plane as the opening surface of the exhaust port 5 is taken as a reference angle, and the angle is within a range of ± 5 ° from the reference angle.

  The present invention is not limited to the above-described embodiment. In this embodiment, the position of the tip 25a of the overhang plate 25 is on the first oblique line L2 and above. Although the front end 22a of the inclined plate 22 is positioned forward, the position of the front end 25a of the overhanging plate 25 is on the first oblique line L2 and with the front end 22a of the upper inclined plate 22. The position on the same vertical plane may be set. In this case, the position of the tip 25a of the overhanging plate 25 is located on the first oblique line L2 and in front of the tip 22a of the upper inclined plate 22. Similar to the above, the overhanging plate 25 prevents rainwater or the like falling from above the combustion device 1 from dripping onto the upper inclined plate 22 of the guide plate 24 and prevents rainwater or the like from entering the exhaust port 5. Exhaust resistance that obstructs the flow of combustion gas heading diagonally forward and upward while reliably suppressing Rukoto without without forming strong flow of combustion gases towards the front wall 20 side of the Kazejogu 17 is intended to exert an effect that it is possible to perform the discharge of smoothly combustion gases to the outside. Furthermore, in the present embodiment, the position of the tip 26a of the underhang plate 26 is on the second oblique line L3 and in front of the tip 23a of the lower inclined plate 23. The position of the tip 26a of the lower projecting plate 26 may be on the second oblique line L3 and on the same vertical plane as the tip 23a of the lower tilted plate 23. As in the case where the position of the tip 26a of the 26 is located on the second oblique line L3 and in front of the tip 23a of the lower inclined plate 23, the lower overhanging plate 26 faces obliquely forward and downward. Without causing an exhaust resistance that obstructs the flow of the combustion gas, the combustion gas can be smoothly discharged to the outside without forming a strong flow of the combustion gas toward the front wall 20 of the windbreaker 17. It demonstrates the effect.

  In the present embodiment, the wind remover 17 and the rectifying tool 21 are independent members. For example, the wind remover 17 includes the configuration of the rectifying tool 21 (guide plate 24, upper projecting plate 25, lower projecting plate). The plate 26) may be provided as a single member, and various modifications are possible without departing from the scope of the invention.

  In this embodiment, the combustion apparatus 1 is used as a boiler for hot water heating that heats a fluid to be heated that is circulated to the heat radiating terminal 12, but a water supply pipe instead of a return pipe 13 on the water inlet side of the heat receiving pipe 8. And a hot water supply pipe connected to the water discharge side of the heat receiving pipe 8 instead of the forward pipe 14, and the combustion apparatus 1 may be used as a hot water supply device for supplying hot water to a hot water tap provided at a predetermined location. is there.

  In this embodiment, the combustion apparatus 1 is a sensible heat recovery type. However, the combustion apparatus 1 includes a latent heat exchanger, a neutralizer, and the like, and is a latent heat recovery type that recovers not only sensible heat but also latent heat. Is also good.

DESCRIPTION OF SYMBOLS 1 Combustion device 3 Combustor 5 Exhaust port 17 Wind remover 20 Front wall 21 Rectifier 22 Upper inclined plate 23 Lower inclined plate 24 Guide plate 25 Upper extended plate 26 Lower extended plate L1 Extension line L2 First oblique line L3 Second Diagonal line

Claims (5)

  In a combustion apparatus comprising a windshield device having a front wall covering the front of the exhaust port in front of an exhaust port of a combustor and having upper and lower surfaces opened, the exhaust gas is disposed between the exhaust port and the windshield device. A rectifying means for defining the flow direction of the combustion gas discharged from the outlet is provided, and the rectifying means includes a dog-shaped guide plate that guides the combustion gas discharged from the exhaust outlet diagonally forward and upward. The combustion apparatus is characterized in that the extension line of the plate portion forming the character shape of the guide plate has a shape that does not overlap the front wall of the windshield means.   The combustion apparatus according to claim 1, wherein the rectifying means includes an upper projecting plate projecting forward from the exhaust port and the guide plate.   3. The combustion apparatus according to claim 1, wherein the rectifying means includes a lower projecting plate projecting forward from the exhaust port and the guide plate.   The guide plate has an upper inclined plate extending obliquely forward and upward and a lower inclined plate extending obliquely downward and downward as the plate portion forming the character shape, and the tip position of the upper projecting plate When the first oblique line that forms substantially the same angle as the angle formed by the upper inclined plate with respect to the opening surface of the exhaust port is extended forward from the upper end of the exhaust port, 4. The combustion apparatus according to claim 2, wherein the combustion apparatus is located at a position on the same vertical plane as the tip of the upper inclined plate or a position ahead of the tip of the upper inclined plate.   The guide plate includes an upper inclined plate extending obliquely forward and upward and a lower inclined plate extending obliquely downward and downward as the plate portion forming the dogleg shape, and the tip position of the lower projecting plate When the second oblique line that forms substantially the same angle as the angle formed by the lower inclined plate with respect to the opening surface of the exhaust port is extended forward from the lower end of the exhaust port, the second oblique line is on the second oblique line, 5. The combustion apparatus according to claim 3, wherein the combustion apparatus is set to a position on the same vertical plane as a tip of the lower inclined plate or a position ahead of a tip of the lower inclined plate.

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