WO2024053264A1

WO2024053264A1 - Combustion device

Info

Publication number: WO2024053264A1
Application number: PCT/JP2023/026703
Authority: WO
Inventors: 良祐弓削; 貴章中越; 剛宮田
Original assignee: リンナイ株式会社
Priority date: 2022-09-09
Filing date: 2023-07-21
Publication date: 2024-03-14
Also published as: JP2024039106A

Abstract

A combustion device 1 includes an exhaust port member 5, wherein: an upper inner wall surface 55a of an upper wall portion 55 of the exhaust port member 5 includes a first upper inner wall surface portion 55b extending from a front end opening portion 71 to a predetermined position located rearward of the front end opening portion 71, an upper projecting wall surface portion 55c which extends over the entirety of an exhaust gas passage in a left-right direction, and which projects from a rear end of the first upper inner wall surface portion 55b toward the inside of the exhaust gas passage, and a second upper inner wall surface portion 55d extending from an inward end of the upper projecting wall surface portion 55c toward a rear end opening portion 72; and the second upper inner wall surface portion 55d is inclined upward toward the front end opening portion 71.

Description

combustion device

The present invention relates to a combustion device having an outer case and a combustion device main body housed within the outer case. In particular, the present invention relates to an improvement in an exhaust port member for preventing drain from scattering to the outside.

In a gas combustion device, combustion exhaust gas is generated by combustion in a burner, and a sensible heat exchanger and a latent heat heat exchanger housed in a combustion case are heated by this combustion exhaust gas. Then, the sensible heat exchanger absorbs the sensible heat of the combustion exhaust gas, and the latent heat exchanger absorbs the latent heat from the combustion exhaust gas after the sensible heat has been absorbed. At this time, the water vapor in the combustion exhaust gas is cooled below the dew point and condensed, thereby producing acidic drain. Therefore, the drain generated within the combustion casing rides on the flow of combustion exhaust gas and scatters to the outside through the front end opening of the exhaust port member, which is the exhaust port.

In order to prevent drain from scattering to the outside from the front end opening of the exhaust port member, it has been proposed to provide a rising wall that rises upward from the lower surface of the exhaust port member (for example, Patent Document 1). According to this exhaust port member, the flow of combustion exhaust gas is blocked by the rising wall, so that drain accumulates near the rising wall.

By the way, unlike the upward combustion type combustion apparatus described in Patent Document 1, there is a downward combustion type combustion apparatus. A downward combustion type combustion device has a built-in burner that injects air-fuel mixture downward to combust it and generate combustion exhaust gas, and a heat exchanger that is heated by the combustion exhaust gas, and a combustion case installed below the burner. and an exhaust duct connected to the outlet of the combustion casing and extending upward from the outlet. In such a combustion device, the combustion exhaust gas is cooled to below the dew point not only in the combustion case but also in the long exhaust duct, so a large amount of drain is generated and flows into the exhaust port member. Therefore, there is a problem in that simply providing a drainage retention area below the inside of the exhaust port member does not prevent the drainage from scattering to the outside. Further, the temperature of the combustion exhaust gas exhausted to the outside from the exhaust port member is usually higher than the temperature of the exhaust port member. Therefore, when the combustion exhaust gas comes into contact with the periphery of the front end opening of the exhaust port member, drainage is generated and the drainage is scattered outside. In particular, in a combustion device connected to a hot water storage tank, when the temperature of hot water supplied from the hot water storage tank to the latent heat heat exchanger is high, combustion exhaust gas whose latent heat has not been sufficiently recovered flows into the exhaust duct from the combustion casing. When such combustion exhaust gas comes into contact with the inner wall surface of the exhaust port member, a large amount of condensate is generated inside the exhaust port member, and the condensate is likely to scatter to the outside.

JP2022-012812A

The present invention solves the above problems, and an object of the present invention is to prevent drain from scattering to the outside from the exhaust port member through the front end opening.

According to one aspect of the invention,
A combustion device comprising an outer case and a combustion device main body housed in the outer case,
The exterior case has a case body having a front opening that opens forward, and a front cover that closes the front opening of the case body and has an exhaust port member insertion port,
The combustion device main body includes a burner that injects the air-fuel mixture downward and burns it to generate combustion exhaust gas, and a heat exchanger that is heated by the combustion exhaust gas, and includes a combustion case disposed below the burner. and an exhaust duct connected to the outlet of the combustion casing so that the combustion exhaust gas flows into the exhaust duct, and an exhaust port member connected to the downstream end of the exhaust duct and exhausting the combustion exhaust gas to the outside. have,
The exhaust duct includes an upright duct portion that extends from the outlet of the combustion casing to a predetermined position above the burner through the rear of the combustion device main body, and a standing duct portion that is bent from an upper end of the upright duct portion and extends to the front cover. a horizontal duct portion extending toward the air outlet member and connected to the exhaust port member;
The exhaust port member includes an upper wall portion and a lower wall portion that are spaced apart from each other in the vertical direction, a left side wall portion, and a right side wall portion so that an exhaust passage is formed inside the exhaust port member. death,
The exhaust port member has a flat front end opening that is long in the left-right direction, and a flat rear end opening that is long in the left-right direction,
The upper wall part and the lower wall part of the exhaust port member protrude forward from inside the exterior case through the exhaust port member insertion opening of the front cover,
The lower wall portion of the exhaust port member is inclined upward toward the front end opening,
The upper inner wall surface of the upper wall portion of the exhaust port member includes a first upper inner wall surface portion extending from the front end opening to a predetermined position located rearward from the front end opening, and the entire left and right direction of the exhaust passage, an upper protruding wall portion that protrudes inward from the rear end of the first upper inner wall portion into the exhaust passage; and a second upper inner wall extending from the inner end of the upper protruding wall portion toward the rear end opening. having a surface portion;
The exhaust passage located forward of the upper protruding wall portion extends upwardly than the exhaust passage located rearward of the upper protruding wall portion,
The second upper inner wall surface is inclined upward toward the front end opening,
In the front-back cross section, the inclination angle of the second upper inner wall surface with respect to the horizontal plane is determined by an imaginary line connecting the inner end of the upper protruding wall surface and the front end of the first upper inner wall surface forming the front end opening. A combustion device is provided that has an angle of inclination with respect to a horizontal plane that is less than that.

According to the present invention, it is possible to prevent drain from scattering to the outside from the front end opening of the exhaust port member.

FIG. 1 is a schematic perspective view showing an example of a combustion apparatus according to an embodiment of the present invention. FIG. 2 is a schematic vertical cross-sectional view of essential parts showing an example of a combustion device according to an embodiment of the present invention. FIG. 3 is a schematic perspective view showing an example of a combustion device main body according to an embodiment of the present invention. FIG. 4 is a schematic enlarged sectional view of essential parts showing an example of a combustion device according to an embodiment of the present invention.

Hereinafter, a combustion apparatus according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the combustion apparatus of this embodiment includes an outer case 100 and a combustion apparatus main body 1 housed within the outer case 100.

The exterior case 100 includes a rectangular box-shaped case body 101 having a front opening 103 that opens forward, and a front cover 102 that closes the front opening 103. In this specification, the side where the front cover 102 is provided is referred to as the front side, and when viewed from the front side, the depth direction of the exterior case 100 is referred to as the front-rear direction, the width direction of the exterior case 100 is referred to as the left-right direction, and the exterior The height direction of the case 100 is referred to as the up-down direction. An exhaust port member insertion opening 104 that is flat in the left and right direction is opened at the upper center of the front cover 102 in the left and right direction. An exhaust port member 5, which will be described later, is inserted into the exhaust port member insertion port 104. A rainproof plate 105 is attached to the back surface of the front cover 102 and stands up to a predetermined height from the lower end of the front cover 102. The case body 101 and the front cover 102 are each formed by molding sheet metal into a predetermined shape.

As shown in FIGS. 2 and 3, the combustion device main body 1 includes a burner 2 that injects a mixture of fuel gas and air downward and combusts it to generate combustion exhaust gas, and a combustion device that surrounds a combustion space of the burner 2. A combustion case 3 disposed below the burner 2, an exhaust duct 4 through which combustion exhaust gas discharged from the combustion case 3 flows, and an exhaust connected to the downstream end of the exhaust duct 4 to discharge the combustion exhaust gas to the outside. It has a mouth member 5.

The burner 2 includes a box-shaped burner body 21 that opens downward, and a combustion plate 22 that covers the downward opening surface of the burner body 21. The burner body 21 has an inlet 23 in its upper part that opens laterally. Therefore, air-fuel mixture is supplied into the burner body 21 from a fan (not shown) through the inlet 23. Then, this air-fuel mixture is ejected downward from the air-fuel mixture jetting part 24 provided on the combustion plate 22, and undergoes total primary combustion. Note that the combustion plate 22 has a large opening in its center. A woven fabric 24a made of heat-resistant fibers is attached to this opening, and a distribution plate 24b having a large number of distribution holes is superimposed on the woven fabric 24a. In this way, the air-fuel mixture jetting section 24 is constituted by the woven cloth 24a and the distribution plate 24b.

The combustion housing 3 includes an upper housing 31 which is open to both upper and lower sides and whose upper end is fastened to the lower peripheral edge of the burner body 21, and a flat dish-shaped intermediate housing 32 which is fastened to the lower end of the upper housing 31. The lower housing 33 has an upper plate portion 33a fastened to a bottom plate portion 32a of the intermediate housing 32, and a lower housing 33 whose upper and lower surfaces are closed. A vent hole 34 is provided at the front of the bottom plate 32a of the intermediate housing 32 and at the front of the upper plate 33a of the lower housing 33 to communicate the internal space of the intermediate housing 32 and the internal space of the lower housing 33. . Furthermore, an outlet 35 through which combustion exhaust gas flows out is provided on the rear surface of the lower casing 33 of the combustion casing 3. Therefore, the combustion exhaust gas is arranged to flow from the interior of the upper housing 31 to the exhaust duct 4 via the interior of the intermediate housing 32, the vent 34, the interior of the lower housing 33, and the outlet 35.

The heat exchanger 30 is a fin-and-tube type main heat exchanger (sensible heat exchanger) disposed in an upper housing 31 and composed of a plurality of heat absorption fins 301a and a plurality of heat absorption pipes 301b penetrating the heat absorption fins 301a. 301, and an auxiliary heat exchanger (latent heat exchanger) 302, which is arranged in the lower casing 33 and consists of a plurality of upper and lower endothermic pipes 302b extending meanderingly in the left-right direction. A plurality of connection headers 301c are attached to the outer surfaces of the mutually opposing side plate portions 31a on one side and the other side in the left-right direction of the upper housing 31. There is. Therefore, all the heat absorption pipes 301b are arranged so as to be connected in series. Further, one connection header 301c defining a connection path connected to the heat absorption pipe 301b at the upstream end of the waterway is provided with a connection port 301d.

Further, on the outer surface of the side plate portion 33b on one side in the left-right direction of the lower housing 33, an inflow-side header defining a connection path connecting one side ends of the plurality of upper and lower endothermic pipes 302b of the auxiliary heat exchanger 302 is provided. 303b, and an outflow header 303c that defines a connection path that connects the other ends of the plurality of upper and lower endothermic pipes 302b. The inflow side header 303b is provided with a water inlet 303d that connects a water supply channel through which hot water is supplied from a hot water storage tank (not shown), and the outflow side header 303c is provided with a pipe (not shown) connected to the connection port 301d. A connection port 303e is provided to be connected via the connection port 303e. Therefore, hot water is arranged to flow from the water inlet 303d to the main heat exchanger 301 via the auxiliary heat exchanger 302. Furthermore, in the upper part of the upper case 31 above the main heat exchanger 301, in order to prevent the part from overheating, there is a water jacket consisting of a plurality of upper and lower water pipes through which the hot water that has passed through the main heat exchanger 301 flows. 310 is provided. The downstream end of the water jacket 310 is connected to a hot water supply path that returns hot water to the hot water storage tank.

The exhaust duct 4 is made of resin. The exhaust duct 4 includes a vertically long standing duct part 42 having a duct inlet 41 on the lower front surface connected to the outflow port 35, and a horizontally flat standing duct part 42 that is bent from the upper end of the standing duct part 42 and extends forward. A horizontal duct part 43 is provided. The upright duct portion 42 extends through the gap between the combustion device main body 1 and the rear surface of the case main body 101 to a predetermined position above the burner 2 .

As shown in FIGS. 2 to 4, the front end of the horizontal duct portion 43, that is, the downstream end of the exhaust duct 4, is connected to the exhaust port member 5. Therefore, the combustion exhaust gas flowing into the exhaust duct 4 from the outlet 35 of the combustion case 3 is discharged to the outside from the exhaust port member 5 via the upright duct part 42 and the horizontal duct part 43. In the vicinity of the front end of the horizontal duct part 43, a flange part 461 that stands outward from the outer peripheral surface of the horizontal duct part 43 and upper and lower ribs 462 that extend rearward from the upper and lower flange parts 461 are formed. The front surface of the flange portion 461 of the horizontal duct portion 43 contacts the rear surface of a flange portion 52 at the rear end of the exhaust port member 5, which will be described later, via an annular packing 200. Further, upper claw portions 501 and lower claw portions 502 that extend rearward from the upper and lower rear ends of the exhaust port member 5 engage with these upper and lower ribs 462, respectively. The horizontal duct portion 43 has a duct tip tube portion 430 that projects forward from the flange portion 461.

The duct tip cylinder part 430 has an inner cylindrical protrusion 432 forming a flat duct outlet 431 in the left-right direction at its front end, and an inner diameter larger than the outer diameter of the inner cylindrical protrusion 432, An outer cylindrical protrusion 433 protrudes slightly forward than the inner cylindrical protrusion 432, and a rearward recess formed between the inner cylindrical protrusion 432 and the outer cylindrical protrusion 433. It has an annular duct engagement groove 434. The front end of the outer cylindrical protrusion 433 engages with an engagement groove 553 in the exhaust port member 5 when the duct tip cylinder portion 430 is fitted into the rear end of the exhaust port member 5, which will be described later. Further, in the duct engagement groove 434 between the inner cylindrical protrusion 432 and the outer cylindrical protrusion 433, a rear end of a cylindrical protrusion 60 that protrudes rearward within the exhaust port member 5, which will be described later, is provided. engage. In addition, the duct lower inner wall surface 435a of the duct lower wall portion 435 at the front end of the duct tip cylinder portion 430 forming the duct outlet 431 has an inclination angle Ad (for example, about 3 to about 4 degrees) with respect to the horizontal plane. It is inclined upward toward the outlet 431. In addition, in FIG. 4, the broken line at each inclination angle indicates a horizontal line.

The exhaust port member 5 is made of resin. The exhaust port member 5 includes a distal end tube portion 51 located at the front end and flat in the left-right direction, a flange portion 52 erected outward from the outer peripheral surface of the rear end of the distal end tube portion 51, and an outer side of the flange portion 52. It has a rain catch part 53 extending rearward from the end, a bank part 54 standing from the rear edge of the rain catch part 53, and an upper claw part 501 and a lower claw part 502 extending rearward from the rear surface of the bank part 54.

The tip tube part 51 has an upper wall part 55 and a lower wall part 56 made of flat plates facing each other with a certain space in the vertical direction, and a cross section in the left-right direction connecting the left ends of the upper and

lower walls

55 and 56 is half-shaped. It has a left side wall portion 57 having an arcuate shape, and a right side wall portion 58 which connects the right ends of the upper and

lower wall portions

55 and 56 and has a semicircular cross section in the left-right direction. The tip tube portion 51 is open in the front and rear. The front end portions of these peripheral wall portions 55 to 58 of the tip tube portion 51 protrude from the inside of the exterior case 100 to the outside through the exhaust port member insertion opening 104 of the front cover 102. Therefore, the opening at the front end of the tip tube portion 51 forms a front end opening 71 that is a flat exhaust port in the left-right direction. Further, the opening at the rear end of the tip tube portion 51 forms an insertion port 75 into which the duct tip tube portion 430 of the horizontal duct portion 43 described above is inserted. Further, the front end portion of the tip tube portion 51 forms a protrusion portion 51a that protrudes forward from the exhaust port member insertion opening 104 of the front cover 102.

The upper wall portion 55 includes a first upper wall portion 551 that extends rearward and approximately horizontally from the front end of the tip tube portion 51 to the flange portion 52, and a first upper wall portion that is located in front of the central portion of the tip tube portion 51 in the front-rear direction. 551, protrudes downward from a predetermined position on the upper inner wall surface 55a located rearward of the front end of the tip tube portion 51, bends backward at the lower end (inner end) E, and extends downward to the center of the tip tube portion 51 in the front-rear direction. It has a second upper wall portion 552 that extends at an angle.

The lower wall portion 56 includes a first lower wall portion 561 that extends from the front end of the tip tube portion 51 to a position vertically facing the rear end portion of the second upper wall portion 552 and tilting downward toward the rear side; It protrudes downward from a predetermined position of the first lower outer wall surface 561b located in front of the rear end of the first lower wall part 561 and behind the front end of the tip tube part 51, and is bent rearward from the protruding end, A second lower wall portion 562 extends substantially horizontally to the flange portion 52. Although not shown, the left and right rear end portions of the second upper wall portion 552 and the first lower wall portion 561 are left inner wall portions that are provided inwardly from the left and right

side wall portions

57 and 58 and have a semicircular cross section in the left and right direction. and are interconnected at the right inner wall. For this reason, a cylindrical protrusion 60 having a flat opening in the left-right direction is formed at the center in the front-rear direction inside the tip tube part 51. The opening at the rear end of the cylindrical protrusion 60 in the tip tube portion 51 communicates with the duct outlet 431 of the exhaust duct 4 when the exhaust port member 5 and the exhaust duct 4 are connected to each other. Therefore, the opening at the rear end of the cylindrical protrusion 60 within the tip tube portion 51 forms the rear end opening 72 of the exhaust port member 5. In addition, the first lower outer wall surface 561b of the first lower wall section 561 and the second lower outer wall surface 562b of the second lower wall section 562 in the region of the protrusion 51a are connected to each other from the exhaust port member insertion opening 104 of the front cover 102. This forms the lower surface of the protruding portion 51a that protrudes forward.

The first lower wall 561 includes a plurality of (hereinafter referred to as In this example, five (5) thin plate-like hanging portions 80 are formed. The plurality of hanging parts 80 are provided at predetermined intervals in the front-rear direction. Therefore, a plurality of grooves 82 recessed upward are formed between the two hanging parts 80 adjacent to each other in the front-rear direction and between the hanging part 80 located at the rear end and the second lower wall part 562. ing. Each hanging portion 80 is formed across the entire first lower wall portion 561 in the left and right direction. Further, the lower end of each hanging portion 80 extends to approximately the same position in the vertical direction as the lower end of the second lower outer wall surface 562b of the second lower wall portion 562 described above. Therefore, although the concave groove portion 82 is formed on the lower surface of the exhaust port member 5, the protruding portion 51a of the exhaust port member 5 has a uniform appearance. Further, since the first lower wall portion 561 is inclined downward toward the rear side, the depth from the first lower outer wall surface 561b of the groove portion 82 to the lower open end becomes deeper toward the front.

The front and rear surfaces of the plurality of hanging parts 80 are substantially vertical upright surfaces, except for the rear surfaces of the hanging parts 80 that extend downward from the front end of the first lower wall part 561 forming the front end opening 71. Further, the rear surface of the hanging portion 80 located at the front end of the first lower wall portion 561 includes a rear inclined surface portion that slopes backward from the lower end toward the upper side at a predetermined inclination angle with respect to the horizontal plane, and an upper end of the rear inclined surface portion. It has a rear upright surface portion extending substantially perpendicularly upward toward the first lower outer wall surface 561b. Therefore, the lower end of the hanging portion 80 located at the front end has an acute V-shape in the longitudinal cross section.

An annular engagement that opens rearward is formed between the cylindrical protrusion 60 and the first upper wall 551, second lower wall 562, and left and

right side walls

57 and 58 that surround the cylindrical protrusion 60. A groove 553 is formed. In order to connect the exhaust port member 5 and the exhaust duct 4 to each other, the duct tip cylinder portion 430 of the horizontal duct portion 43 of the exhaust duct 4 is inserted into the exhaust port member 5 from the insertion port 75 at the rear end of the exhaust port member 5. When inserted into the horizontal duct section 43, the outer cylindrical protrusion 433 of the duct tip tube section 430 of the horizontal duct section 43 engages with the engagement groove 553. Further, the rear end of the cylindrical protrusion 60 that protrudes rearward engages with a duct engagement groove 434 between the outer cylindrical protrusion 433 and the inner cylindrical protrusion 432. Then, when the exhaust port member 5 and the exhaust duct 4 are connected to each other, an exhaust passage Pa for combustion exhaust gas that communicates with the exhaust passage Pu of the exhaust duct 4 is formed inside the exhaust port member 5.

The upper inner wall surface 55a of the upper wall portion 55 of the exhaust port member 5 is formed by a first upper inner wall surface portion 55b formed by the first upper wall portion 551 and a second upper wall portion 552 having an L-shaped cross section in the front-rear direction. It has an upper protruding wall surface portion 55c and a second upper inner wall surface portion 55d. The first upper inner wall surface portion 55b extends from the front end opening 71 to the front end of the second upper wall portion 552. The upper protruding wall surface portion 55c extends downward from the rear end of the first upper inner wall surface portion 55b. The second upper inner wall surface portion 55d extends from the lower end of the upper protruding wall surface portion 55c toward the rear end opening 72. The first upper inner wall surface portion 55b extends rearward substantially horizontally. Further, the upper protruding wall surface portion 55c hangs down from the first upper inner wall surface portion 55b over the entire left and right direction of the exhaust passage Pa. For this reason, a downwardly convex stepped portion is formed at a predetermined position on the upper inner wall surface 55a located behind the front end opening 71 of the exhaust port member 5. Moreover, the exhaust passage Pa located in front of the upper protruding wall surface portion 55c in the exhaust port member 5 extends upwardly than the exhaust passage Pa located behind the upper protruding wall surface portion 55c.

The second upper inner wall surface portion 55d connected to the upper protruding wall surface portion 55c is inclined upward toward the front end opening 71 at an inclination angle Ai (for example, about 3 to about 4 degrees) with respect to the horizontal plane (inclination angle The dashed line Ai indicates an extension of the second upper inner wall surface portion 55d). Further, in the front-rear cross section of the first upper inner wall surface portion 55b, the upper protruding wall surface portion 55c, and the second upper inner wall surface portion 55d, the inclination angle Ai of the second upper inner wall surface portion 55d described above is the lower end of the upper protruding wall surface portion 55c. (Inner end) A predetermined angle (for example, about 11 to about 12 degrees) smaller than the inclination angle Aj with respect to the horizontal plane of the imaginary line Lj connecting E and the front end of the first upper inner wall surface portion 55b forming the front end opening 71. It is formed to be. Note that the inclination angle and length in the front-rear direction of the first upper inner wall surface portion 55b, the upper protruding wall surface portion 55c, and the second upper inner wall surface portion 55d are such that the inclination angle Ai of the second upper inner wall surface portion 55d is the inclination of the virtual line Lj. As long as it is smaller than the angle Aj, it can be set as appropriate.

The first lower wall portion 561 of the exhaust port member 5 forming the front end opening 71 is inclined upward from the rear end opening 72 toward the front end opening 71. The lower inner wall surface 56a of the first lower wall portion 561 is inclined upward from the rear end opening 72 toward the front end opening 71 at an inclination angle As (for example, about 9 to about 11 degrees) with respect to the horizontal plane. (The dashed line with the inclination angle As indicates an extension of the lower inner wall surface 56a).

The second upper inner wall surface 55d of the upper wall section 55 and the lower inner wall surface 56a of the lower wall section 56 preferably have an inclination angle As with respect to a horizontal plane of the lower inner wall surface 56a that faces the second upper inner wall surface 55d in the vertical direction. , is formed to be larger than the inclination angle Ai of the second upper inner wall surface portion 55d with respect to the horizontal plane. Further, preferably, the lower inner wall surface 56a of the first lower wall portion 561 is formed such that the inclination angle As is smaller than the inclination angle Aj. Further, the lower inner wall surface 56a of the lower wall portion 56 forming the rear end opening 72 and the duct lower wall portion 435 forming the duct outlet 431 of the exhaust duct 4 communicating with the rear end opening 72 of the exhaust port member 5. The duct lower inner wall surface 435a is preferably formed such that the above-mentioned inclination angle As of the lower inner wall surface 56a is larger than the above-mentioned inclination angle Ad of the duct lower inner wall surface 435a.

According to the present embodiment, the tip tube portion 51 forming the downstream end of the exhaust port member 5 is provided with an inner portion of the exhaust passage Pa from a predetermined position of the first upper inner wall surface portion 55b located rearward than the front end opening 71. An upper protruding wall surface portion 55c that protrudes in the direction, and a second upper inner wall surface portion 55d extending rearward from the lower end of the upper protruding wall surface portion 55c are formed. Therefore, the exhaust passage Pa in the exhaust port member 5 located in front of the upper protruding wall portion 55c extends upwardly than the exhaust passage Pa in the exhaust port member 5 located in the rear of the upper protruding wall portion 55c. Therefore, the combustion exhaust gas flowing into the exhaust port member 5 from the rear end opening 72 and flowing along the second upper inner wall surface 55d is directed to the first upper inner wall surface at the periphery of the front end opening 71 where it is cooled most by the outside air. It is difficult to flow toward 55b. As a result, it is possible to suppress the combustion exhaust gas from coming into contact with the first upper inner wall surface portion 55b at the peripheral edge of the front end opening 71. This makes it possible to suppress the occurrence of drainage at the periphery of the front end opening 71.

Further, according to the present embodiment, in the front-rear cross section, the inclination angle Ai of the second upper inner wall surface portion 55d with respect to the horizontal plane is the same as that between the lower end E of the upper protruding wall surface portion 55c and the first upper inner wall surface portion forming the front end opening 71. It is smaller than the inclination angle Aj of the imaginary line connecting the front ends of 55b with respect to the horizontal plane. Therefore, the combustion exhaust gas flowing forward from the front end of the second upper inner wall surface portion 55d is difficult to spread upward. Therefore, the combustion exhaust gas can be reliably prevented from coming into contact with the first upper inner wall surface portion 55b at the peripheral edge of the front end opening 71. This makes it possible to suppress the occurrence of drainage at the periphery of the front end opening 71. In this embodiment, the second upper inner wall surface portion 55d is formed with a single inclination angle. However, the second upper inner wall surface portion 55d may have a plurality of inclination angles. In this case, the first upper inner wall surface 55b and the upper A protruding wall surface portion 55c and a second upper inner wall surface portion 55d are formed.

Further, according to the present embodiment, the lower inner wall surface 56a of the lower wall portion 56 is inclined upward toward the front end opening 71. Therefore, even if condensate generated within the exhaust duct 4 flows into the exhaust port member 5 or is generated within the exhaust port member 5, the condensate can be returned to the exhaust duct 4.

As described above, according to the present embodiment, since the combustion exhaust gas is unlikely to come into contact with the periphery of the front end opening 71 of the exhaust port member 5, the occurrence of drainage at the periphery of the front end opening 71 can be suppressed. Further, drain flowing into the exhaust port member 5 from the exhaust duct 4 or drain generated within the exhaust port member 5 can be returned to the exhaust duct 4. For this reason, a downward combustion type combustion device having a long exhaust duct 4 is connected to a hot water storage tank, high temperature hot water is supplied from the hot water storage tank to the secondary heat exchanger 302, and the latent heat is sufficiently recovered in the secondary heat exchanger 302. Even if unused combustion exhaust gas flows into the exhaust duct 4, it is possible to reliably prevent the drain from scattering to the outside from the front end opening 71 of the exhaust port member 5.

In the above embodiment, the upper inner wall surface 55a of the upper wall portion 55 is formed with a first upper inner wall surface portion 55b, an upper protruding wall surface portion 55c, and a second upper inner wall surface portion 55d. However, corresponding wall portions may be provided on the lower inner wall surface 56a of the lower wall portion 56, or may be provided on both inner wall surfaces 55a and 56a of the upper wall portion 55 and the lower wall portion 56. When the lower inner wall surface 56a of the lower wall portion 56 is provided with a first lower inner wall surface portion, a lower protruding wall surface portion, and a second lower inner wall surface portion corresponding to the configuration of the above embodiment, the front end is disposed along the second lower inner wall surface portion. In order to suppress the flow of combustion exhaust gas flowing toward the front end of the first lower inner wall surface forming the opening 71, and to suppress the contact of the periphery of the front end opening 71 of the combustion exhaust gas to the first lower inner wall surface, The inclination angles and longitudinal lengths of the first lower inner wall surface, the lower protruding wall surface, and the second lower inner wall surface are designed as appropriate.

Furthermore, in the above embodiment, the combustion device is supplied with hot water from the hot water storage tank. However, the combustion device may also be supplied with circulating hot or cold water.

Although the present invention has been described in detail above, the present invention can be summarized as follows.
According to one aspect of the invention,
A combustion device comprising an outer case and a combustion device main body housed in the outer case,
The exterior case has a case body having a front opening that opens forward, and a front cover that closes the front opening of the case body and has an exhaust port member insertion port,
The combustion device main body includes a burner that injects the air-fuel mixture downward and burns it to generate combustion exhaust gas, and a heat exchanger that is heated by the combustion exhaust gas, and includes a combustion case disposed below the burner. and an exhaust duct connected to the outlet of the combustion casing so that the combustion exhaust gas flows into the exhaust duct, and an exhaust port member connected to the downstream end of the exhaust duct and exhausting the combustion exhaust gas to the outside. have,
The exhaust duct includes an upright duct portion that extends from the outlet of the combustion casing to a predetermined position above the burner through the rear of the combustion device main body, and a standing duct portion that is bent from an upper end of the upright duct portion and extends to the front cover. a horizontal duct portion extending toward the air outlet member and connected to the exhaust port member;
The exhaust port member includes an upper wall portion and a lower wall portion that are spaced apart from each other in the vertical direction, a left side wall portion, and a right side wall portion so that an exhaust passage is formed inside the exhaust port member. death,
The exhaust port member has a flat front end opening that is long in the left-right direction, and a flat rear end opening that is long in the left-right direction,
The upper wall part and the lower wall part of the exhaust port member protrude forward from inside the exterior case through the exhaust port member insertion opening of the front cover,
The lower wall portion of the exhaust port member is inclined upward toward the front end opening,
The upper inner wall surface of the upper wall portion of the exhaust port member includes a first upper inner wall surface portion extending from the front end opening to a predetermined position located rearward from the front end opening, and the entire left and right direction of the exhaust passage, an upper protruding wall portion that protrudes inward from the rear end of the first upper inner wall portion into the exhaust passage; and a second upper inner wall extending from the inner end of the upper protruding wall portion toward the rear end opening. having a surface portion;
The exhaust passage located forward of the upper protruding wall portion extends upwardly than the exhaust passage located rearward of the upper protruding wall portion,
The second upper inner wall surface is inclined upward toward the front end opening,
In the front-back cross section, the inclination angle of the second upper inner wall surface with respect to the horizontal plane is determined by an imaginary line connecting the inner end of the upper protruding wall surface and the front end of the first upper inner wall surface forming the front end opening. A combustion device is provided that has an angle of inclination with respect to a horizontal plane that is less than that.

According to the above combustion device, the combustion exhaust gas flowing along the second upper inner wall surface within the exhaust passage of the exhaust port member is unlikely to come into contact with the periphery of the front end opening of the exhaust port member. Moreover, according to the above-mentioned combustion device, drain flowing into the exhaust port member from the exhaust duct and drain generated inside the exhaust port member can be returned to the exhaust duct. Thereby, it is possible to prevent the drain from scattering to the outside from the front end opening of the exhaust port member.

Preferably, in the combustion device,
A lower inner wall surface of the lower wall portion of the exhaust port member is inclined upward toward the front end opening,
The horizontal duct part of the exhaust duct has a duct outlet connected to the rear end opening of the exhaust port member,
A duct lower inner wall surface of a duct lower wall portion forming the duct outlet is inclined upward toward the duct outlet;
The angle of inclination of the lower inner wall surface of the lower wall portion forming the rear end opening of the exhaust port member with respect to the horizontal plane is as follows: greater than the tilt angle.

According to the combustion device described above, it is possible to suppress drain generated within the exhaust duct from flowing into the exhaust port member.

Preferably, in the combustion device,
The angle of inclination of the region of the lower inner wall surface facing the second upper inner wall surface with respect to the horizontal plane is greater than the angle of inclination of the second upper inner wall surface with respect to the horizontal plane.

According to the above combustion device, when the combustion exhaust gas passes through the inside of the exhaust port member, the combustion exhaust gas comes into contact with the lower inner wall surface more easily than the second upper inner wall surface. Therefore, even if drainage occurs inside the exhaust port member, the drainage can be smoothly returned to the exhaust duct.

Preferably, in the combustion device,
The protruding portion of the exhaust port member that protrudes forward from the exhaust port member insertion opening of the front cover is recessed upward between a hanging portion extending downward from the lower surface thereof and the hanging portion and the front cover. It has a concave groove part.

According to the above combustion device, the protrusion protruding forward from the exhaust port member insertion port of the front cover has a hanging portion extending downward from the lower surface of the protrusion, so that the drain flowing from the front end opening of the exhaust port member can be drained. flows downward. According to the above-mentioned combustion device, since the groove portion recessed upward is formed between the hanging portion and the front cover, the drain can be dripped downward from the hanging portion. Thereby, even if drain is scattered from the front end opening of the exhaust port member, it is possible to prevent the drain from flowing along the lower surface of the exhaust port member toward the front cover.

Although the present invention has been described above with reference to the present embodiments, the present invention is not limited thereto. The configuration and details of the present invention may be modified in various ways within the scope of the present invention by those skilled in the art.

According to the present invention, it is possible to provide a combustion device that can prevent drain from scattering from the exhaust port member to the outside.

Claims

A combustion device comprising an outer case and a combustion device main body housed in the outer case,
The exterior case has a case body having a front opening that opens forward, and a front cover that closes the front opening of the case body and has an exhaust port member insertion port,
The combustion device main body includes a burner that injects the air-fuel mixture downward and burns it to generate combustion exhaust gas, and a heat exchanger that is heated by the combustion exhaust gas, and includes a combustion case disposed below the burner. and an exhaust duct connected to the outlet of the combustion casing so that the combustion exhaust gas flows into the exhaust duct, and an exhaust port member connected to the downstream end of the exhaust duct and exhausting the combustion exhaust gas to the outside. have,
The exhaust duct includes an upright duct portion that extends from the outlet of the combustion casing to a predetermined position above the burner through the rear of the combustion device main body, and a standing duct portion that is bent from an upper end of the upright duct portion and extends to the front cover. a horizontal duct portion extending toward the air outlet member and connected to the exhaust port member;
The exhaust port member includes an upper wall portion and a lower wall portion that are spaced apart from each other in the vertical direction, a left side wall portion, and a right side wall portion so that an exhaust passage is formed inside the exhaust port member. death,
The exhaust port member has a flat front end opening that is long in the left-right direction, and a flat rear end opening that is long in the left-right direction,
The upper wall part and the lower wall part of the exhaust port member protrude forward from inside the exterior case through the exhaust port member insertion opening of the front cover,
The lower wall portion of the exhaust port member is inclined upward toward the front end opening,
The upper inner wall surface of the upper wall portion of the exhaust port member includes a first upper inner wall surface portion extending from the front end opening to a predetermined position located rearward from the front end opening, and the entire left and right direction of the exhaust passage, an upper protruding wall portion that protrudes inward from the rear end of the first upper inner wall portion into the exhaust passage; and a second upper inner wall extending from the inner end of the upper protruding wall portion toward the rear end opening. having a surface portion;
The exhaust passage located forward of the upper protruding wall portion extends upwardly than the exhaust passage located rearward of the upper protruding wall portion,
The second upper inner wall surface is inclined upward toward the front end opening,
In the front-back cross section, the inclination angle of the second upper inner wall surface with respect to the horizontal plane is determined by an imaginary line connecting the inner end of the upper protruding wall surface and the front end of the first upper inner wall surface forming the front end opening. A combustion device whose angle of inclination is less than the horizontal plane.
The combustion device according to claim 1,
A lower inner wall surface of the lower wall portion of the exhaust port member is inclined upward toward the front end opening,
The horizontal duct part of the exhaust duct has a duct outlet connected to the rear end opening of the exhaust port member,
A duct lower inner wall surface of a duct lower wall portion forming the duct outlet is inclined upward toward the duct outlet;
The angle of inclination of the lower inner wall surface of the lower wall portion forming the rear end opening of the exhaust port member with respect to the horizontal plane is as follows: Combustion device larger than the angle of inclination.