EXHAUST ADAPTER

Abstract

An exhaust adapter comprises a packing 15 compressed and held between a flange 14 of an exhaust flow path portion 5 and an outer peripheral portion of an exhaust outlet 11, and a sliding guide portion 18 provided on an inner surface of the main body 2 and brought into pressure contact with an outer surface of a closing portion 16 that is an opposing wall of an opening 13 of the exhaust flow path portion 5 are included. The sliding guide portion 18 is formed with a concave arcuate portion 18a inclined in a direction of a side of the exhaust outlet 11 from a distal end side toward a proximal end side, and the exhaust flow path portion 5 is fixed to the main body 2 in a state where the outer surface of the closing portion 16 is formed in a convex arcuate surface 16a and the convex arcuate surface 16a is pushed along the concave arcuate portion 18a of the sliding guide portion 18.

Claims

1. An exhaust adapter connected to a combustion device including a box-shaped device main body forming an outer shell and an exhaust cylinder protruding outward from the device main body, the exhaust adapter comprising: a box-shaped main body provided with an exhaust outlet that discharges combustion exhaust gas from the combustion device; an exhaust flow guide body provided in the main body and connecting the exhaust cylinder to the exhaust outlet; an exhaust flow path portion constituting a part of the exhaust flow guide body and including an opening that communicates with the exhaust outlet and a flange provided on an outer peripheral edge of the opening; a packing that is compressed and held between the flange of the exhaust flow path portion and an inner surface of the main body at an outer peripheral portion of the exhaust outlet; and a sliding guide portion provided on an inner surface of the main body and brought into pressure contact with an outer surface of a closing portion, the outer surface being an opposing wall of the opening in the exhaust flow path portion, wherein the sliding guide portion is formed with a concave arcuate portion inclined in a direction on a side of the exhaust outlet from a distal end side toward a proximal end side, and the exhaust flow path portion is fixed to the main body in a state where an outer surface of the closing portion is formed in a convex arcuate surface, and the convex arcuate surface is pushed in along the concave arcuate portion of the sliding guide portion.

2. The exhaust adapter according to claim 1, wherein the exhaust flow path portion includes a bulging portion that bulges outward, and the bulging portion constitutes the closing portion.

3. The exhaust adapter according to claim 1, wherein the exhaust flow path portion is fixed to the main body by screw fixing, and a direction of the screw fixing is set to a direction intersecting a compression direction of the packing.

4. The exhaust adapter according to claim 2, wherein the exhaust flow path portion is fixed to the main body by screw fixing, and a direction of the screw fixing is set to a direction intersecting a compression direction of the packing.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0024] FIG. 1 is a front view illustrating a combustion device according to the present embodiment.

[0025] FIG. 2 is a schematic diagram illustrating an internal configuration of the combustion device in the present embodiment.

[0026] FIG. 3 is a perspective view illustrating the combustion device in a case where a front lid of an exhaust adapter of the present embodiment is in an open state.

[0027] FIG. 4 is a perspective view illustrating a state when the exhaust adapter of the present embodiment is installed on a top surface portion of the combustion device.

[0028] FIG. 5 is a perspective view (FIG. 5A) illustrating a case where a front lid is in a closed state and a perspective view (FIG. 5B) illustrating a case where the front lid is in an open state in the exhaust adapter of the present embodiment.

[0029] FIG. 6 is a cross-sectional view illustrating the exhaust adapter of the present embodiment.

[0030] FIG. 7 is a perspective view illustrating the exhaust adapter of the present embodiment from a bottom surface side.

[0031] FIG. 8 is a cross-sectional view of the exhaust adapter of the present embodiment as viewed from a rear side.

[0032] FIG. 9 is a cross-sectional perspective view of the exhaust adapter of the present embodiment in a state of being disassembled into a main body and an exhaust flow guide body.

[0033] FIG. 10 is an enlarged cross-sectional view illustrating a connection portion between an exhaust coupling portion and an exhaust cylinder of the combustion device in the exhaust adapter of the present embodiment.

[0034] FIG. 11 is a cross-sectional view for explaining an assembling method of the exhaust adapter of the present embodiment.

[0035] FIG. 12 is a cross-sectional view for explaining the assembling method of the exhaust adapter of the present embodiment.

[0036] FIG. 13 is an enlarged cross-sectional view illustrating a compressed state of the packing between a flange of an exhaust flow path portion and a side wall of a main body in the exhaust adapter of the present embodiment.

DESCRIPTION OF EMBODIMENTS

[0037] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0038] A combustion device 30 illustrated in FIGS. 1, 2, and 3 constitutes a hot water supply device as an example of the present invention. The combustion device includes a box-shaped casing 32 including an open portion 31 on the front side, and a front cover 34 covering the open portion 31 and removably fixed to the casing 32. The casing 32 and the front cover 34 constitute a device main body that forms an outer shell of the device. The upper end of the front cover 34 is fixed to the casing 32 with latch locks 46, and the lower end is fixed to the casing with screws 49a. Note that the fixing means of the upper end portion of the front cover 34 may be another fixing means such as screw fastening in addition to the latch locks 46 In the present specification, as illustrated in FIG. 3, a side of the front cover 34 of the combustion device 30 is defined as a front surface, and a front-rear, left-right, and up-down positional relationship is defined.

[0039] As illustrated in FIG. 2, a combustion unit 35, a heat exchange unit 36, an air blowing means 37, an air supply unit 38, and an exhaust unit 39 are disposed in the casing 32. The exhaust unit 39 includes a cylindrical exhaust cylinder 40 in an exhaust downstream portion. The air supply unit 38 includes in an air supply upstream portion a cylindrical air supply cylinder 41 and a ring-shaped air supply cylinder 42 in which the exhaust cylinder 40 is disposed in an inner peripheral portion. The exhaust cylinder 40, the air supply cylinder 41, and the ring-shaped air supply cylinder 42 are disposed so as to protrude upward from a top surface portion 33 (that is also a top surface portion of the combustion device 30) of the casing 32. The air blowing means 37 mixes air introduced from the air supply unit 38 into the combustion device 30 with fuel gas supplied from a fuel supply pipe 43, and supplies the mixed gas to the combustion unit 35. The combustion unit 35 generates combustion exhaust gas by burning the mixed gas by a burner (not illustrated) provided in the combustion unit 35. The heat exchange unit 36 heats fluid (water) flowing from a water supply pipe 44 into a heat transfer pipe (not illustrated) by the combustion exhaust gas sent from the combustion unit 35. The fluid heated by the heat exchange unit 36 flows out from the heat transfer pipe to a hot water outlet pipe 45 and is supplied to a hot water supply terminal. The combustion exhaust gas after the fluid is heated by the heat exchange unit 36 is discharged from the exhaust unit 39 to the outside of the instrument.

[0040] In the present embodiment, an exhaust adapter 1 connected to the exhaust cylinder 40 is installed on the top surface portion 33 of the combustion device 30. The combustion device 30 in which the exhaust adapter 1 is not installed in the top surface portion 33 can be applied to an indoor installation type combustion device 30, and the combustion device in which the exhaust adapter 1 is installed in the top surface portion 33 can be applied to an outdoor installation type combustion device 30. That is, by installing the exhaust adapter 1 in the top surface portion 33 in the combustion device 30 of an indoor installation type, it is possible to convert the combustion device into the combustion device 30 of an outdoor installation type. As illustrated in FIG. 4, the exhaust adapter 1 of the present embodiment is attached to a top surface portion 33 of the combustion device 30 by fixing plate portions 51 as fastening portions provided at the left and right end portions in a main body 2 to fixing components 52 provided at the left and right end portions of the top surface portion 33 of the combustion device 30 with screws 51a. Furthermore, the exhaust adapter 1 is provided with an openable and closable front lid 8 that covers a cutout portion 20 provided in the front surface of the main body 2. By opening the front lid 8, the fixing plate portions 51 can be screwed from a front surface side of the combustion device 30 through the cutout portion 20 of the main body 2, and the attachment work of the exhaust adapter 1 can be easily performed as compared with the case of working from a side of the top surface portion 33 of the combustion device 30. Furthermore, by opening the front lid 8, the latch locks 46 on the upper portion of the front cover 34 can be unlocked through the cutout portion 20, and the front cover 34 can be removed without interference of the exhaust adapter 1 by the cutout portion 20 (See FIG. 3). Therefore, the front cover 34 can be removed from the casing 32 without removing the exhaust adapter 1 from the combustion device 30, and workability of removing the front cover 34 at the time of maintenance or the like of the combustion device 30 can be improved.

[0041] As illustrated in FIGS. 4-9, the exhaust adapter 1 of the present embodiment includes a main body 2 as an external component and an exhaust flow guide body 3 as an internal component provided in the main body 2. The exhaust flow guide body 3 includes an exhaust coupling portion 4 and an exhaust flow path portion 5.

[0042] The main body 2 includes a side wall 6 and an upper wall 7, and is formed in a box shape with a lower side opened. The upper wall 7 of the main body 2 has a rectangular shape, and a front portion is an inclined surface higher than a rear portion. The side wall 6 of the main body 2 extends downward from a peripheral edge portion of the upper wall 7. An openable front lid 8 is attached to the side wall 6 on the front side. The front lid 8 has a shape bulging forward and is formed with dimensions to be flush with the front cover 34 of the combustion device 30 in the closed state. The side wall 6 on the rear side is formed with dimensions to be flush with a back surface of the casing 32 of the combustion device 30. Lower ends of the front lid 8 and the side wall 6 on the rear side are formed with dimensions to substantially match the upper end of the front cover 34 and the upper end of the back surface of the casing 32. The side walls 6 on the left and right sides each have a bulging shape in which a lower portion from the vicinity of a vertically intermediate portion to the lower end bulges outward, and are formed with dimensions to be flush with the left and right surfaces of the casing 32 of the combustion device 30. The side walls 6 on the left and right sides are formed to have dimensions that extend to positions where lower ends of the side walls 6 on the left and right sides are covered with rounded corners between the left and right surfaces and the top surface of the casing 32. As described above, in the state where the exhaust adapter 1 is installed in the top surface portion 33 of the combustion device 30, the main body 2 of the external component covers the top surface portion 33 of the combustion device 30 and is flush with the front and rear surfaces and the left and right surfaces of the device main body of the combustion device 30, so that the exhaust adapter 1 has a sense of unity with the combustion device 30, and the designability from the front is improved. Note that the main body 2 of the exhaust adapter 1 may be slightly larger or smaller in size than the top surface portion 33 of the combustion device 30, or may extend to a position where the lower end portion of the main body 2 slightly covers the upper portion of the combustion device 30. Note that, in the present embodiment, the main body 2, the exhaust flow guide body 3, and the front lid 8 are formed of a resin material.

[0043] Air supply ports 9 opened horizontally in the front-rear direction are provided in lower portions of the side walls 6 on the left and right sides of the main body 2. In the vicinity of the side walls 6 on the left and right sides in the main body 2, there are provided guide plates 10 (See FIG. 7, and 8) facing the air supply ports 9 and extending in parallel with the side walls 6. The air flowing into the main body 2 from the outside through the air supply ports 9 by the guide plates 10 flows downward and is guided to the air supply cylinder 41 and the ring-shaped air supply cylinder 42 in the top surface portion 33 of the combustion device 30. An upper portion of the side wall 6 on the front side from the upper end to the vicinity of the intermediate portion is an inclined surface facing obliquely upward. The inclined surface is provided with an exhaust outlet 11 that opens horizontally long in the left-right direction. The exhaust flow path portion 5 is connected to the exhaust outlet 11 so as to communicate with the exhaust outlet in the main body 2. On an inner surface of the front side side wall 6 forming the exhaust outlet 11, plate-shaped insertion protrusions 12 protruding into the main body 2 are provided at an upper portion and a lower portion of the exhaust outlet 11. The upper and lower insertion protrusions 12 are disposed in the exhaust flow path portion 5, and can form a space in which the combustion exhaust gas is accumulated in a peripheral edge portion of the exhaust outlet 11 to prevent the temperature of the side wall 6 around the exhaust outlet 11 from lowering. Furthermore, on the inner surface of the side wall 6 on the front side, receiving plate portions 60 (See FIG. 8) whose outer end portions are curved upward are provided at right and left positions below the lower insertion protrusion 12. The left and right receiving plate portions 60 are provided along the outer periphery of the corner portion of a flange 14 of the exhaust flow path portion 5 disposed on the inner surface of the side wall 6 on the front side.

[0044] A side wall 6 on the front side is provided with a cutout portion 20 cut out over the entire left and right width at a predetermined height from the lower end to the vicinity of the intermediate portion. The front lid 8 covering the cutout portion 20 is attached to the side wall 6 on the front side. The front lid 8 is fixed to the main body 2 so as to be openable and closable with respect to the cutout portion 20 by a hinge 21. The hinge 21 has a configuration in which a hinge shaft is sandwiched between two hinge clamping plates, is provided at the upper end of the cutout portion 20 and the left and right positions on the upper portion of the front lid 8, and allows the front lid 8 to be turned upward to an open state. Furthermore, the hinge 21 is provided with an engaging portion (not illustrated) on the hinge shaft and the hinge clamping plates, and is configured such that when the front lid 8 is turned upward to be in the open state, the engaging portion is engaged to hold the front lid 8 at the position in the open state. Note that, in the present embodiment, the hinge 21 is provided on the upper portion of the front lid 8, but the hinge 21 may be provided at the right end portion or the left end portion of the front lid 8, and the front lid 8 may be opened to the right or the left. Alternatively, the front lid 8 may be divided into left and right portions, and the hinges 21 may be provided at the left and right end portions of the divided front lid 8, and the front lid 8 may be hinged double doors. Furthermore, as the hinge 21, any hinge means such as a combination of a shaft and a shaft hole, a shaft groove or the like, or a hinge or the like may be used.

[0045] Left and right side end portions of the front lid 8 are bent along the side walls 6 on the left and right sides of the main body 2, and engagement pieces 27 (See FIG. 9) are provided at rear end portions of the bent portions. Engaging protrusions 28 (See FIG. 9) that engage with the engagement pieces 27 of the front lid 8 are provided on the inner surfaces of the front edge portions in the side walls 6 on the left and right sides. In a position where the front lid 8 is in the closed state, the engagement piece 27 of the front lid 8 and the engaging protrusion 28 of the side walls 6 on the left and right sides are engaged with each other, and the front lid 8 is held at the position in the closed state so as not to be easily opened. Note that, in the present embodiment, the means for holding the front lid 8 in the closed state is an engagement means by the engagement piece 27 and the engaging protrusion 28 described above, but may be other holding means such as a magnetic attraction means.

[0046] As illustrated in FIG. 7, the exhaust flow guide body 3 includes the exhaust coupling portion 4 connected to the exhaust cylinder 40 of the combustion device 30 and the exhaust flow path portion 5 connecting the exhaust coupling portion 4 to the exhaust outlet 11 of the main body 2. The exhaust coupling portion 4 and the exhaust flow path portion 5 are integrated, and the respective internal spaces communicate with each other.

[0047] The exhaust coupling portion 4 is formed in a cylindrical shape so as to follow the inner peripheral shape of the exhaust cylinder 40 of the combustion device 30. An upper end portion of the exhaust coupling portion 4 is joined to the exhaust flow path portion 5. As illustrated in FIG. 10, a lower portion of the exhaust coupling portion 4 is inserted into the exhaust cylinder 40 and connected to communicate with the exhaust cylinder 40. A cylindrical packing 70 is disposed between a lower portion of the exhaust coupling portion 4 and the exhaust cylinder 40. In the cylindrical packing 70, an inward seal portion 71 is provided over the entire circumference at an upper end portion, and an outward extension portion 72 is provided over the entire circumference at a lower end portion. An upper end portion of the exhaust cylinder 40 is provided with a groove portion 40a over the entire circumference. The cylindrical packing 70 is inserted into and attached to the groove portion 40a of the exhaust cylinder 40, the extending portion 72 abuts on the inner wall of the groove portion 40a, and the seal portion 71 is disposed inside the exhaust cylinder 40 from the upper end portion of the exhaust cylinder 40. Therefore, the exhaust coupling portion 4 connected in the exhaust cylinder 40 is brought into pressure contact with the seal portion 71 of the cylindrical packing 70, and leakage of the combustion exhaust gas at the connection portion between the exhaust cylinder 40 and the exhaust coupling portion 4 is prevented.

[0048] The exhaust flow path portion 5 includes an internal space through which the combustion exhaust gas of the combustion device 30 flows, and is formed in a flat box shape in which an opening 13 opened horizontally is provided on a front end side and a rear end side facing the opening 13 is a closing portion (16). The exhaust coupling portion 4 is joined to a central portion of the bottom surface of the exhaust flow path portion 5 so as to communicate with the internal space. The outward flange 14 is formed on an outer peripheral edge of the opening 13 of the exhaust flow path portion 5. The flange 14 of the exhaust flow path portion 5 is provided with an annular packing 15 and is pressed against and connected to the side wall 6 on the front side in the main body 2 at the outer peripheral portion of the exhaust outlet 11. As a result, the opening 13 of the exhaust flow path portion 5 communicates with the exhaust outlet 11 of the main body 2, and the combustion exhaust gas of the combustion device 30 is discharged from the exhaust cylinder 40 to the outside from the exhaust outlet 11 through the exhaust coupling portion 4 and the exhaust flow path portion 5.

[0049] A closing portion on the rear end side of the exhaust flow path portion 5 includes a bulging portion 16 that bulges outward in a substantially U shape, and an outer surface of the bulging portion 16 is formed on a convex arcuate surface 16a. An outer surface of the bulging portion 16 is provided with a fixing portion 17 that is screwed to the main body 2 at an intermediate portion in the left-right width direction.

[0050] On the other hand, a rear portion of the inner surface of the upper wall 7 of the main body 2 is provided with a sliding guide portion 18 that is brought into pressure contact with the outer surface of the bulging portion 16 of the exhaust flow path portion 5, and a fixed base 19 that is screwed to the fixing portion 17 of the exhaust flow path. A total of four sliding guide portions 18 are provided at two locations corresponding to positions of the left and right end portions of the bulging portion 16 and two left and right locations corresponding to the central position. The fixed base 19 includes a screw hole and is provided at one location corresponding to an intermediate portion of the bulging portion 16. The exhaust flow path portion 5 is attached to the main body 2 by fixing the fixing portion 17 to the fixed base 19 with screws in a state where the bulging portion 16 is pressed against the sliding guide portion 18.

[0051] The sliding guide portion 18 is provided at a position where the exhaust flow path portion 5 disposed in the main body 2 can be pushed in a direction of a side of the exhaust outlet 11. A concave arcuate portion 18a inclined in the direction on the side of the exhaust outlet 11 on the front side from the distal end side toward the proximal end side of the sliding guide portion 18 is formed in the front portion of the sliding guide portion 18. On the distal end side of the concave arcuate portion 18a, a receiving portion 18b formed obliquely so that the distal end side opens is provided. The exhaust flow path portion 5 is fixed to the main body 2 in a state where the convex arcuate surface 16a which is an outer surface of the bulging portion 16 is pushed into the concave arcuate portion 18a of the sliding guide portion 18.

[0052] Next, assembly of the exhaust adapter 1 will be described.

[0053] As illustrated in FIGS. 11 and 12, a packing 15 is disposed on a flange 14 of the exhaust flow path portion 5, the exhaust flow path portion 5 is disposed in the main body 2 from the open portion 31 of the main body 2, and the insertion protrusion 12 in the main body 2 is inserted and locked into an opening 13 of the exhaust flow path portion 5 (See FIG. 11). Subsequently, the flange 14 on the front side of the exhaust flow path portion 5 is brought into contact with the side wall 6 of the outer peripheral portion of the exhaust outlet 11 via the packing 15, and the bulging portion 16 on the rear side of the exhaust flow path portion 5 is disposed in the sliding guide portion 18 (See FIG. 12(a)). At this time, the bulging portion 16 of the exhaust flow path portion 5 is smoothly guided to the front portion of the sliding guide portion 18 by abutting on the receiving portion 18b of the sliding guide portion 18. In this state, the bulging portion 16 is pushed from the distal end side to the proximal end side of the sliding guide portion 18. As the bulging portion 16 is pushed, the convex arcuate surface 16a, which is the outer surface of the bulging portion 16, is pushed in while sliding along the concave arcuate portion 18a of the sliding guide portion 18, and the exhaust flow path portion 5 is guided by the sliding guide portion 18 and strongly pressed toward the side of the front exhaust outlet 11 (See FIG. 12(b)). In this state, the fixing portion 17 of the exhaust flow path portion 5 and the fixed base 19 of the main body 2 are fixed with a screw 17a. In this way, the exhaust flow guide body 3 including the exhaust flow path portion 5 and the exhaust coupling portion 4 is attached in the main body 2, and the exhaust adapter 1 is assembled.

[0054] As described above, in the exhaust adapter 1 of the embodiment, the convex arcuate surface 16a of the outer surface of the bulging portion 16 of the exhaust flow path portion 5 is pushed in while sliding along the concave arcuate portion 18a of the sliding guide portion 18 in the assembly process, whereby the exhaust flow path portion 5 is guided to the sliding guide portion 18 and strongly pressed toward the side of the exhaust outlet 11. Accordingly, the packing 15 disposed between the flange 14 of the exhaust flow path portion 5 and the side wall 6 forming the exhaust outlet 11 of the main body 2 can be held in a highly compressed state over the entire circumference.

[0055] Therefore, there is no variation in compression of the packing 15, and it is possible to ensure high airtightness between the flange 14 of the exhaust flow path portion 5 and the side wall 6 of the main body 2, and to highly hermetically seal the exhaust flow path portion 5. As a result, it is possible to prevent the combustion exhaust gas from leaking into the main body 2 from the opening 13 of the exhaust flow path portion 5, and it is possible to prevent the combustion exhaust gas from flowing into the combustion device 30 and deteriorating combustion performance. Furthermore, it is also possible to prevent dew condensation water staying in the vicinity of the opening 13 in the exhaust flow path portion 5 from entering the main body 2 from the opening 13 of the exhaust flow path portion 5, and it is possible to prevent dew condensation water from adhering to the main body 2 such as the casing 32 of the combustion device 30 and deteriorating the main body 2.

[0056] By the way, in a case where the exhaust flow path portion 5 is pressed toward the side of the exhaust outlet 11 only by human force, the compressed state of the packing 15 partially varies, and it is difficult to compress the packing 15 to a high compressed state over the entire circumference until the dimensional tolerance of each component is absorbed. According to the present embodiment, by pushing the bulging portion 16 behind the exhaust flow path portion 5 while sliding along the sliding guide portion 18, the exhaust flow path portion 5 can be easily strongly pressed against the side of the exhaust outlet 11, and the packing 15 can be compressed to a high compressed state over the entire circumference. Incidentally, in the present embodiment, a high compression state of about 70% to 75% can be obtained as the compression ratio of the packing 15. On the other hand, when the packing 15 is excessively compressed, the elasticity of the packing 15 itself may be lost. Therefore, as illustrated in FIG. 13, the flange 14 is provided with a receiving groove 14a in which the packing 15 is disposed, a protruding portion 14b is provided on an outer peripheral edge of the receiving groove 14a, and the protruding portion 14b abuts on the side wall 6 of the main body 2, thereby restricting the packing 15 from being excessively compressed.

[0057] Furthermore, in the present embodiment, in the exhaust flow path portion 5, a closing portion that is an opposing wall of the opening 13 is formed as the bulging portion 16 bulging rearward. As a result, the exhaust flow path portion 5 is lengthened by the bulging portion 16, and the exhaust flow path portion 5 is easily pressed when the bulging portion 16 is pushed into the sliding guide portion 18, so that the exhaust flow path portion 5 can be easily assembled. Furthermore, since the flow path length of the combustion exhaust gas flowing through the exhaust flow path portion 5 is increased by the bulging portion 16, the flow velocity of the combustion exhaust gas can be reduced. As a result, even in a case where the exhaust outlet 11 is almost blocked by the blowing of the gust, the packing 15 can prevent the combustion exhaust gas from leaking into the main body 2 from the opening 13 of the exhaust flow path portion 5. Furthermore, it is possible to prevent dew condensation water staying in the exhaust flow path portion 5, the vicinity of the exhaust outlet 11, and the like from scattering out of the exhaust outlet 11 due to the combustion exhaust gas as the flow velocity of the combustion exhaust gas decreases.

[0058] Furthermore, in the present embodiment, the fixing portion 17 of the exhaust flow path portion 5 and the fixed base 19 of the main body 2 are fixed by the screw 17a, so that the bulging portion 16 of the exhaust flow path portion 5 is held in a state of being pushed toward the proximal end side of the sliding guide portion 18. The fixing direction by the screw 17a is a vertical direction, and is set to a lateral direction in which the exhaust flow path portion 5 is pressed by the sliding guide portion 18, that is, a direction intersecting a compression direction of the packing 15. The compression direction of the packing 15 of the exhaust flow path portion 5 is the same direction as the direction of the side of the exhaust outlet 11 in which the sliding guide portion 18 presses the exhaust flow path portion 5, and the compression repulsive force of the packing 15 acts on the exhaust flow path portion 5 in the opposite direction to the direction of the side of the exhaust outlet 11. The screw fixing direction of the exhaust flow path portion 5 is a direction parallel to the screwing direction of the screw 17a. In a case where the screw fixing direction is set to be parallel to the compression direction of the packing 15 with respect to the exhaust flow path portion 5, the compression repulsive force of the packing 15 acts in the direction in which the screw is released. In the present embodiment, since the compressive repulsive force of the packing 15 acts on the exhaust flow path portion 5 in the direction intersecting the screw fixing direction, the screw 17a can be prevented from loosening, and the fixing by the screw 17a can be held. As a result, the exhaust flow path portion 5 assembled in the state of being pushed into the sliding guide portion 18 is stably held in the state of being pushed toward the side of the exhaust outlet 11 by the sliding guide portion 18 without being displaced in the direction of escaping from the sliding guide portion 18 by the fixing of the screw 17a. Therefore, the airtightness of the packing 15 can be stably maintained in a high state. Furthermore, since the screwing direction of the screw 17a is the same direction as the direction in which the exhaust flow path portion 5 is pushed into the sliding guide portion 18, the assembly work of assembling the exhaust flow path portion 5 in the main body 2 can be easily performed.

[0059] Note that the present invention is not limited to the above embodiment, and any modification can be made within the scope of claims. For example, in the present embodiment, the air supply cylinder 41 and the ring-shaped air supply cylinder 42 are provided on the top surface portion 33 of the combustion device 30, and the air flowing into the main body 2 from the outside through the air supply port 9 is guided to the air supply cylinder 41 and the ring-shaped air supply cylinder 42. However, one of the air supply cylinder 41 and the ring-shaped air supply cylinder 42 may be closed, and the air may be supplied into the combustion device 30 only from the other, or only one of the air supply cylinder 41 and the ring-shaped air supply cylinder 42 may be provided on the top surface portion 33 of the combustion device 30.

INDUSTRIAL APPLICABILITY

[0060] The exhaust adapter of the present invention is used for an exhaust adapter connected to a combustion device such as a hot water supply device. The exhaust adapter can be applied to an outdoor installation type hot water supply device installed on a top surface of an indoor installation type hot water supply device, for example.

[0061] According to the present invention, there is provided an exhaust adapter capable of ensuring high airtightness of an exhaust flow path portion inside the exhaust adapter while enhancing design from the front by providing a sense of unity with a hot water supply device.

REFERENCE SIGNS LIST

[0062] 1 . . . exhaust adapter; 2 . . . main body; 3 . . . exhaust flow guide body; 4 . . . exhaust coupling portion; 5 . . . exhaust flow path portion; 6 . . . side wall; 7 . . . upper wall; 8 . . . front lid; 9 . . . air supply port; 10 . . . guide plate; 11 . . . exhaust outlet; 12 . . . insertion protrusion; 13 . . . opening; 14 . . . flange; 15 . . . packing; 16 . . . bulging portion; 16a . . . convex arcuate surface; 17 . . . fixing portion; 18 . . . sliding guide portion; 18a . . . concave arcuate portion; 18b . . . receiving portion; 19 . . . fixed base; 20 . . . cutout portion; 21 . . . hinge; 22 . . . arm; 23 . . . hinge shaft; 24 . . . hinge clamping plate; 25 . . . protrusion; 26 . . . recess; 27 . . . engagement piece; 28 . . . engaging protrusion; 30 . . . combustion device; 31 . . . open portion; 32 . . . casing; 33 . . . top surface portion; 34 . . . front cover; 35 . . . combustion unit; 36 . . . heat exchange unit; 37 . . . air blowing means; 38 . . . air supply unit; 39 . . . exhaust unit; 40 . . . exhaust cylinder; 41 . . . air supply cylinder; 42 . . . ring-shaped air supply cylinder; 43 . . . fuel supply pipe; 44 . . . water supply pipe; 45 . . . hot water outlet pipe; 46 . . . latch lock; 47 . . . hook; 48 . . . attachment portion; 49 . . . fixing piece; 51 . . . fixing plate portion; 52 . . . fixing component; 60 . . . receiving plate portion