WO2024106351A1

WO2024106351A1 - Exhaust adapter

Info

Publication number: WO2024106351A1
Application number: PCT/JP2023/040656
Authority: WO
Inventors: 良祐弓削
Original assignee: リンナイ株式会社
Priority date: 2022-11-16
Filing date: 2023-11-10
Publication date: 2024-05-23
Also published as: JP2024072638A

Abstract

Provided is an exhaust adapter capable of ensuring a high degree of airtightness between a main body and an exhaust flow guide inside the main body. An exhaust adapter 1 comprises: a main body 2 provided with an exhaust outlet 11 for discharging combustion exhaust from a combustion device 30; an exhaust flow guide 3 which is provided inside the main body and which connects an exhaust pipe of the combustion device to the exhaust outlet; an exhaust flow passage portion 5 which constitutes a portion of the exhaust flow guide and which includes a flange 14 provided on an outer peripheral edge of an opening portion 13 that communicates with the exhaust outlet; packing 15 held in a compressed state between the flange of the exhaust flow passage portion and a main body inner surface of an outer peripheral portion of the exhaust outlet; and a sliding guide portion 18 which is provided on a main body inner surface and which is in pressure contact with an outer surface of a closing portion 16, which is a wall opposing the opening portion of the exhaust flow passage portion. A concave arcuate portion 18a that is inclined increasingly toward the exhaust outlet side with increasing distance from a distal end side toward a base end side is formed in the sliding guide portion, and in the exhaust flow passage portion, an outer surface of the closing portion is formed with a convex arcuate surface 16a, and the exhaust flow passage portion is fixed to the main body in a state in which the convex arcuate surface has been pushed in along the concave arcuate portion of the sliding guide portion.

Description

Exhaust adapter

The present invention relates to an exhaust adapter that connects to a combustion device, for example, an exhaust adapter that allows an indoor combustion device to be adapted to an outdoor installation.

Combustion equipment such as hot water heaters are equipped with an exhaust pipe that discharges combustion exhaust. In indoor combustion equipment, the exhaust pipe is connected to an exhaust pipe installed in the wall of the building, so the exhaust pipe is often installed protruding from the top of the combustion equipment. In outdoor combustion equipment, the exhaust pipe is installed on the front or side of the combustion equipment to prevent the combustion exhaust from directly hitting the wall or eaves of the building. As the installation configuration of the exhaust pipe differs between indoor and outdoor combustion equipment, combustion equipment manufacturers must produce combustion equipment according to indoor and outdoor installation types, and users must also purchase a new combustion equipment when changing from an indoor installation to an outdoor installation.

In the past, a technology was known for a combustion device with an exhaust pipe on the top surface of the device in which an exterior case with an exhaust window on the front surface was installed on the top surface of the combustion device, allowing the combustion exhaust to flow only forward (Patent Document 1).

Japanese Patent Application Laid-Open No. 5-187721

However, the above-mentioned conventional technology does not convert a combustion device from an indoor installation type to an outdoor installation type. The present inventor has considered the development of a new exhaust adapter that can convert an indoor installation type combustion device into an outdoor installation type combustion device. When installing an exhaust adapter on a combustion device, in order to give the exhaust adapter a sense of unity with the combustion device and improve the design from the front, it is considered to be composed of a main body as an external part and an exhaust guiding fluid as an internal part that sends the combustion exhaust of the combustion device to the exhaust outlet of the main body. In this case, if the airtightness of the connection part between the exhaust outlet of the main body and the exhaust guiding fluid is low, the combustion exhaust and condensation water will leak from the exhaust guiding fluid into the main body. If the combustion exhaust leaks into the main body, the combustion exhaust will flow into the combustion device and reduce the combustion performance. If the condensation water leaks into the main body, the condensation water will adhere to the main body of the combustion device and deteriorate the main body.

The present invention was made in consideration of the above circumstances, and aims to provide an exhaust adapter that can ensure high airtightness between the main body and the exhaust guide fluid inside the main body.

The exhaust adapter according to the present invention comprises:
An exhaust adapter connected to a combustion device having a box-shaped device body forming an outer shell and an exhaust pipe protruding outward from the device body,
A box-shaped main body having an exhaust outlet for discharging combustion exhaust from the combustion device;
An exhaust guide fluid is provided in the main body and connects the exhaust pipe to the exhaust outlet;
an exhaust flow passage portion that constitutes a part of the exhaust fluid guide and has an opening portion that communicates with the exhaust outlet and a flange provided on an outer periphery of the opening portion;
a packing that is compressed and held between a flange of the exhaust flow path portion and an inner surface of the main body at an outer periphery of the exhaust outlet;
a sliding guide portion provided on an inner surface of the main body and pressed against an outer surface of a closing portion that is an opposing wall of the opening in the exhaust flow path,
The sliding guide portion is formed with a concave arc portion that is inclined toward the exhaust outlet side from the tip end side toward the base end side,
The exhaust flow path portion is configured so that the outer surface of the blocking portion is formed into a convex arc-shaped surface, and the convex arc-shaped surface is fixed to the main body in a state where it is pressed along the concave arc-shaped portion of the sliding guide portion.

With the above configuration, the flange of the exhaust flow passage is placed against the inner surface of the main body at the outer periphery of the exhaust outlet with the packing sandwiched therebetween, and the exhaust flow passage is fixed to the main body with the blocking portion of the exhaust flow passage pushed from the tip side to the base end side of the sliding guide portion, and the exhaust adapter is assembled. During this assembly process, the convex arc surface of the outer surface of the blocking portion of the exhaust flow passage is pushed while sliding along the concave arc portion of the sliding guide portion, so that the exhaust flow passage is guided by the sliding guide portion and strongly pressed against the exhaust outlet side. This allows the packing placed between the flange of the exhaust flow passage and the inner surface of the main body to be held in a highly compressed state. Therefore, there is no variation in the compression of the packing, and a high level of airtightness can be ensured between the flange of the exhaust flow passage and the inner surface of the main body. As a result, it is possible to prevent the combustion exhaust from leaking into the main body from the opening of the exhaust flow passage, and to prevent the combustion exhaust from flowing into the combustion device and reducing the combustion performance. In addition, it is possible to prevent condensation water that has accumulated near the opening in the exhaust flow passage from entering the main body through the opening of the exhaust flow passage, and it is possible to prevent condensation water from adhering to the main body of the combustion device and deteriorating the main body.

In the exhaust adapter,
The exhaust flow passage portion may include a bulging portion that bulges outward, and the bulging portion may form the blocking portion.

With this configuration, the provision of the bulging portion lengthens the exhaust flow path, and when the blocking portion, which is the bulging portion, is pushed into the sliding guide portion, it becomes easier to press down the exhaust flow path, making it easier to assemble the exhaust flow path. In addition, the bulging portion increases the flow path length of the combustion exhaust flowing through the exhaust flow path, so the flow rate of the combustion exhaust can be reduced. As a result, even if the exhaust outlet becomes slightly blocked due to a gust of wind, the gasket can prevent the combustion exhaust from leaking into the main body through the opening of the exhaust flow path. In addition, the reduced flow rate of the combustion exhaust can prevent condensation water that has accumulated in the exhaust flow path or near the exhaust outlet from being scattered out of the exhaust outlet by the combustion exhaust.

In the exhaust adapter,
The exhaust passage portion is fixed to the main body by screws,
The screw fixing direction may be set in a direction intersecting with a compression direction of the packing.

The compression direction of the packing of the exhaust flow passage is the same as the exhaust outlet side direction in which the sliding guide presses the exhaust flow passage, and the compression repulsion force of the packing acts on the exhaust flow passage in the opposite direction to the exhaust outlet side direction. The screw fixing direction of the exhaust flow passage is parallel to the screw threading direction. If the screw fixing direction is set to a direction parallel to the compression direction of the packing with respect to the exhaust flow passage, the compression repulsion force of the packing acts in the direction in which the screw comes out. According to the above-mentioned configuration of the present invention, the compression repulsion force of the packing acts on the exhaust flow passage in a direction intersecting the screw fixing direction, so that the screw can be prevented from loosening and the screw can be maintained fixed. As a result, the exhaust flow passage assembled in a state where it is pressed into the sliding guide is stably maintained in a state where it is pressed against the exhaust outlet side by the sliding guide without being displaced in the direction of escaping from the sliding guide by the screw fixing. Therefore, the packing can be stably maintained in a high airtight state. In addition, the screw threading direction is the same as the direction in which the exhaust flow passage is pressed into the sliding guide, so that the assembly work of assembling the exhaust flow passage into the main body can be easily performed.

FIG. 2 is a front view showing the combustion device according to the embodiment. 1 is a schematic diagram showing an internal configuration of a combustion device according to an embodiment of the present invention. 1 is a perspective view showing a combustion device according to an embodiment of the present invention when a front cover of an exhaust adapter is in an open state. FIG. 1 is a perspective view showing a state in which the exhaust adapter of the present embodiment is installed on a top surface of a combustion apparatus. FIG. 1A is a perspective view showing the exhaust adapter of the present embodiment when the front cover is in a closed state, and FIG. 1B is a perspective view showing the exhaust adapter of the present embodiment when the front cover is in an open state. FIG. 2 is a cross-sectional view showing the exhaust adapter of the present embodiment. 1 is a perspective view of the exhaust adapter of the present embodiment, seen from the bottom side. FIG. 2 is a cross-sectional view of the exhaust adapter of the present embodiment as viewed from the rear side. FIG. FIG. 2 is a cross-sectional perspective view of the exhaust adapter of the present embodiment disassembled into a main body and an exhaust guide. 4 is an enlarged cross-sectional view showing a connection portion between an exhaust connection portion and an exhaust stack of a combustion device in the exhaust adapter of the present embodiment. FIG. 5A to 5C are cross-sectional views for explaining a method of assembling the exhaust adapter of the present embodiment. 5A to 5C are cross-sectional views for explaining a method of assembling the exhaust adapter of the present embodiment. 4 is an enlarged cross-sectional view showing a compressed state of a packing between a flange of an exhaust flow path and a side wall of a main body in the exhaust adapter of the present embodiment. FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
The combustion device 30 shown in Figures 1, 2, and 3 constitutes a hot water supply device as an example of the present invention, and includes a box-shaped casing 32 having an open section 31 at the front, and a front cover 34 that covers the open section 31 and is removably fixed to the casing 32, and the casing 32 and the front cover 34 constitute the device body that is the outer shell of the device. The front cover 34 is fixed to the casing 32 at its upper end with a snap lock 46 and at its lower end with a screw 49a. The fixing means for the upper end of the front cover 34 may be other fixing means such as a screw fastener other than the snap lock 46. In this specification, as shown in Figure 3, the front cover 34 side of the combustion device 30 is defined as the front side, and the positional relationship of the front and rear, left and right, and up and down is specified.

As shown in FIG. 2, the casing 32 is provided with a combustion section 35, a heat exchange section 36, a blowing means 37, an air intake section 38, and an exhaust section 39. The exhaust section 39 has a cylindrical exhaust tube 40 at the exhaust downstream section. The air intake section 38 has a cylindrical air intake tube 41 at the air intake upstream section, and a ring-shaped air intake tube 42 with the exhaust tube 40 disposed on its inner periphery. The exhaust tube 40, the air intake tube 41, and the ring-shaped air intake tube 42 are disposed protruding upward from the top surface 33 of the casing 32 (which is also the top surface of the combustion device 30). The air blowing means 37 mixes the air introduced from the air intake section 38 into the combustion device 30 with the fuel gas supplied from the fuel supply pipe 43, and supplies the mixed gas to the combustion section 35. The combustion section 35 burns the mixed gas with a burner (not shown) provided in the combustion section 35 to generate combustion exhaust. The heat exchange unit 36 heats the fluid (water) flowing from the water supply pipe 44 to the heat transfer pipe (not shown) using the combustion exhaust air sent from the combustion unit 35. The fluid heated in the heat exchange unit 36 flows out of the heat transfer pipe into the hot water outlet pipe 45 and is supplied to the hot water supply terminal. The combustion exhaust air after the fluid is heated in the heat exchange unit 36 is discharged outside the appliance through the exhaust unit 39.

In this embodiment, an exhaust adapter 1 that connects to an exhaust pipe 40 is installed on the top surface 33 of the combustion device 30. The combustion device 30 can be applied to an indoor-installed combustion device 30 without the exhaust adapter 1 installed on the top surface 33, and to an outdoor-installed combustion device 30 with the exhaust adapter 1 installed on the top surface 33. In other words, by installing the exhaust adapter 1 on the top surface 33 of an indoor-installed combustion device 30, it can be converted to an outdoor-installed combustion device 30. As shown in FIG. 4, the exhaust adapter 1 of this embodiment is attached to the top surface 33 of the combustion device 30 by fixing the fixing plate part 51 as a fastening part provided at the left and right ends inside the main body 2 to the fixing parts 52 provided at the left and right ends of the top surface 33 of the combustion device 30 with screws 51a. In addition, the exhaust adapter 1 is provided with an openable front cover 8 that covers the cutout part 20 provided on the front surface of the main body 2. By opening the front cover 8, the fixing plate 51 can be screwed from the front side of the combustion device 30 through the notch 20 of the main body 2, making it easier to install the exhaust adapter 1 than when working from the top surface 33 of the combustion device 30. In addition, by opening the front cover 8, the snap lock 46 on the top of the front cover 34 can be unlocked through the notch 20, and the front cover 34 can be removed without interference from the exhaust adapter 1 due to the notch 20 (see Figure 3). Therefore, the front cover 34 can be removed from the casing 32 without removing the exhaust adapter 1 from the combustion device 30, improving the ease of removing the front cover 34 during maintenance of the combustion device 30.

As shown in Figures 4 to 9, the exhaust adapter 1 of this embodiment includes a main body 2, which is an external component, and an exhaust guiding fluid 3, which is an internal component, provided within the main body 2. The exhaust guiding fluid 3 is composed of an exhaust connection portion 4 and an exhaust flow path portion 5.

The main body 2 has side walls 6 and an upper wall 7, and is formed in a box shape with an open bottom. The upper wall 7 of the main body 2 has a rectangular shape and is an inclined surface with the front higher than the rear. The side walls 6 of the main body 2 extend downward from the peripheral edge of the upper wall 7. An openable front cover 8 is attached to the front side wall 6. The front cover 8 has a shape that bulges forward, and is formed with dimensions that make it flush with the front cover 34 of the combustion device 30 when closed. The rear side wall 6 is formed with dimensions that make it flush with the back surface of the casing 32 of the combustion device 30. The front cover 8 and the rear side wall 6 are formed with dimensions such that the lower ends approximately match the upper end of the front cover 34 and the upper end of the back surface of the casing 32. The left and right side walls 6 have a bulging shape with the lower parts bulging outward from near the middle part in the vertical direction to the lower ends, and are formed with dimensions that make them flush with the left and right sides of the casing 32 of the combustion device 30. The left and right side walls 6 are formed to a size that extends to a position where the lower ends cover the rounded corners between the left and right sides and the top surface of the casing 32. In this way, when the exhaust adapter 1 is installed on the top surface 33 of the combustion device 30, the main body 2 of the external part covers the top surface 33 of the combustion device 30 and is flush with the front, rear, left and right sides of the device main body of the combustion device 30, giving a sense of unity with the combustion device 30 and improving the design from the front. The main body 2 of the exhaust adapter 1 may be slightly larger or smaller than the top surface 33 of the combustion device 30, and the lower end of the main body 2 may extend to a position that somewhat covers the upper part of the combustion device 30. In this embodiment, the main body 2, the exhaust guiding fluid 3, and the front cover 8 are molded from a resin material.

The lower part of the left and right side walls 6 of the main body 2 is provided with an air intake port 9 that opens horizontally in the front-rear direction. Near the left and right side walls 6 in the main body 2, a guide plate 10 (see Figures 7 and 8) is provided facing the air intake port 9 and extending parallel to the side walls 6. The air that flows into the main body 2 from the outside through the air intake port 9 is guided downward by this guide plate 10 to the air intake cylinder 41 and the ring-shaped air intake cylinder 42 on the top surface 33 of the combustion device 30. The upper part of the front side wall 6 from the upper end to near the middle part is an inclined surface facing diagonally upward. This inclined surface is provided with an exhaust outlet 11 that opens horizontally in the left-right direction. The exhaust outlet 11 is connected to the exhaust flow path section 5 in the main body 2 so as to communicate with it. The inner surface of the front side wall 6 that forms the exhaust outlet 11 is provided with a plate-shaped insertion protrusion 12 that protrudes into the main body 2 at the upper and lower parts of the exhaust outlet 11. The upper and lower insertion protrusions 12 are arranged in the exhaust flow passage 5, and form a space that retains the combustion exhaust gas on the periphery of the exhaust outlet 11 to prevent a drop in temperature of the side wall 6 around the exhaust outlet 11. In addition, on the inner surface of the front side wall 6, receiving plate portions 60 (see FIG. 8) whose outer ends are curved upward are provided at left and right positions below the lower insertion protrusion 12. The left and right receiving plate portions 60 are provided so as to fit along the outer periphery of the corners of the flange 14 of the exhaust flow passage 5 arranged on the inner surface of the front side wall 6.

The front side wall 6 has a notch 20 cut out across the entire width from the bottom end to near the middle at a predetermined height. A front cover 8 that covers the notch 20 is attached to the front side wall 6. The front cover 8 is fixed to the main body 2 by a hinge 21 so that it can be opened and closed relative to the notch 20. The hinge 21 has a structure in which a hinge shaft is sandwiched between two hinge clamping plates, and is provided at the left and right positions at the upper end of the notch 20 and the top of the front cover 8, and the front cover 8 can be rotated upward to an open state. In addition, the hinge 21 has engagement portions (not shown) provided on the hinge shaft and the hinge clamping plates, and is configured so that when the front cover 8 is rotated upward to an open state, the engagement portions engage with each other to hold the front cover 8 in an open position. In this embodiment, the hinge 21 is provided at the top of the front cover 8, but the hinge 21 may be provided at the right or left end of the front cover 8 to make the front cover 8 open to the right or left, or the front cover 8 may be divided into left and right halves and the hinges 21 provided at both the left and right ends of the divided front cover 8 to make the front cover 8 open like a double door. The hinge 21 may be any hinge means such as a combination of an axis and an axis hole or axis groove, or a hinge.

The left and right side ends of the front cover 8 are bent to fit the left and right side walls 6 of the main body 2, with engagement pieces 27 (see FIG. 9) provided at the rear ends of these bent portions, and engagement protrusions 28 (see FIG. 9) that engage with the engagement pieces 27 of the front cover 8 are provided on the inner surfaces of the front edges of the left and right side walls 6. When the front cover 8 is in the closed position, the engagement pieces 27 of the front cover 8 engage with the engagement protrusions 28 of the side walls 6, and the front cover 8 is held in the closed position so that it does not open easily. In this embodiment, the means for holding the front cover 8 in the closed position is the engagement means between the engagement pieces 27 and the engagement protrusions 28, but it may also be an attraction means such as a magnet.

As shown in FIG. 7, the exhaust guiding fluid 3 includes an exhaust connection part 4 that is connected to the exhaust tube 40 of the combustion device 30, and an exhaust flow path part 5 that connects between the exhaust connection part 4 and the exhaust outlet 11 of the main body 2. The exhaust connection part 4 and the exhaust flow path part 5 are integrated, and their respective internal spaces are connected to each other.

The exhaust connection part 4 is formed in a cylindrical shape so as to follow the inner peripheral shape of the exhaust tube 40 of the combustion device 30. The upper end of the exhaust connection part 4 is joined to the exhaust flow path part 5. As shown in FIG. 10, the lower part of the exhaust connection part 4 is inserted into the exhaust tube 40 and connected so as to communicate with the exhaust tube 40. A cylindrical gasket 70 is arranged between the lower part of the exhaust connection part 4 and the exhaust tube 40. The cylindrical gasket 70 has an inward-facing seal part 71 provided around the entire circumference at the upper end and an outward-facing extension part 72 provided around the entire circumference at the lower end. A groove part 40a is provided around the entire circumference at the upper end of the exhaust tube 40. The cylindrical gasket 70 is inserted into the groove part 40a of the exhaust tube 40 and attached, the extension part 72 abuts against the inner wall of the groove part 40a, and the seal part 71 is arranged inside the exhaust tube 40 from the upper end of the exhaust tube 40. Therefore, the exhaust connection part 4 connected to the inside of the exhaust tube 40 is pressed against the seal part 71 of the cylindrical packing 70, preventing the leakage of combustion exhaust gas at the connection part between the exhaust tube 40 and the exhaust connection part 4.

The exhaust flow passage section 5 has an internal space through which the combustion exhaust of the combustion device 30 flows, and is formed in a flat box shape with a horizontally long opening 13 at the front end side and a closed section (16) at the rear end side opposite the opening 13. The exhaust connection section 4 is joined to the center of the bottom surface of the exhaust flow passage section 5 so as to communicate with the internal space. An outward flange 14 is formed on the outer periphery of the opening 13 of the exhaust flow passage section 5. The flange 14 of the exhaust flow passage section 5 is connected by pressing it against the front side wall 6 inside the main body 2 at the outer periphery of the exhaust outlet 11 with an annular packing 15 arranged thereon. As a result, the opening 13 of the exhaust flow passage section 5 is connected to the exhaust outlet 11 of the main body 2, and the combustion exhaust of the combustion device 30 is discharged from the exhaust tube 40 through the exhaust connection section 4 and the exhaust flow passage section 5 to the outside from the exhaust outlet 11.

The blocking portion at the rear end of the exhaust flow passage portion 5 has a bulge portion 16 that bulges outward in a roughly U-shape, and the outer surface of this bulge portion 16 is formed into a convex arc-shaped surface 16a. A fixing portion 17 is provided on the outer surface of the bulge portion 16 at the midpoint in the left-right width direction to be fixed to the main body 2 with a screw.

Meanwhile, at the rear part of the inner surface of the upper wall 7 of the main body 2, there is provided a sliding guide part 18 that is pressed against the outer surface of the bulge part 16 of the exhaust flow passage part 5, and a fixed base 19 that is fixed with screws to the fixed part 17 of the exhaust flow passage. A total of four sliding guide parts 18 are provided, two at the left and right end positions of the bulge part 16 and two at left and right positions that correspond to the central position. The fixed base 19 has a screw hole and is provided at one position that corresponds to the middle part of the bulge part 16. The exhaust flow passage part 5 is attached inside the main body 2 by fixing the fixed part 17 to the fixed base 19 with screws while the bulge part 16 is pressed against the sliding guide part 18.

The sliding guide 18 is provided in a position that allows the exhaust flow passage 5 disposed within the main body 2 to be pushed toward the exhaust outlet 11. A concave arc-shaped portion 18a is formed at the front of the sliding guide 18, inclining forward toward the exhaust outlet 11 as it moves from the tip end of the sliding guide 18 to the base end. A receiving portion 18b is provided at the tip end of the concave arc-shaped portion 18a, which is formed at an angle so that the tip end opens. The exhaust flow passage 5 is fixed to the main body 2 with the convex arc-shaped surface 16a, which is the outer surface of the bulge 16, pushed into the concave arc-shaped portion 18a of the sliding guide 18.

Next, the assembly of the exhaust adapter 1 will be described.
As shown in Figures 11 and 12, the packing 15 is placed on the flange 14 of the exhaust flow passage 5, the exhaust flow passage 5 is placed 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 the opening 13 of the exhaust flow passage 5 (see Figure 11). Next, the front flange 14 of the exhaust flow passage 5 is abutted against the side wall 6 of the outer periphery of the exhaust outlet 11 via the packing 15, and the rear bulge 16 of the exhaust flow passage 5 is placed in the sliding guide 18 (see Figure 12(a)). At this time, the bulge 16 of the exhaust flow passage 5 is smoothly guided to the front part of the sliding guide 18 by abutting against the receiving portion 18b of the sliding guide 18. In this state, the bulge 16 is pushed from the tip side to the base end side of the sliding guide 18. As the bulge 16 is pressed in, the convex arc surface 16a, which is the outer surface of the bulge 16, is pressed in while sliding along the concave arc surface 18a of the sliding guide 18, and the exhaust flow path 5 is guided by the sliding guide 18 and strongly pressed forward against the exhaust outlet 11 (see FIG. 12(b)). In this state, the fixing portion 17 of the exhaust flow path 5 and the fixing base 19 of the main body 2 are fixed with screws 17a. In this manner, the exhaust guiding fluid 3 having the exhaust flow path 5 and the exhaust connecting portion 4 is attached inside the main body 2, and the exhaust adapter 1 is assembled.

As described above, in the assembly process of the exhaust adapter 1 of the embodiment, the convex arc surface 16a on the outer surface of the bulge portion 16 of the exhaust flow path portion 5 is pushed in while sliding along the concave arc portion 18a of the sliding guide portion 18, so that the exhaust flow path portion 5 is guided by the sliding guide portion 18 and strongly pressed against the exhaust outlet 11 side. This allows the packing 15 placed 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 to be held in a highly compressed state all around. Therefore, there is no variation in the compression of the packing 15, and a high level of airtightness can be ensured between the flange 14 of the exhaust flow path portion 5 and the side wall 6 of the main body 2, allowing for a high level of sealing. As a result, it is possible to prevent the combustion exhaust from leaking into the main body 2 from the opening 13 of the exhaust flow path portion 5, and to prevent the combustion exhaust from flowing into the combustion device 30 and reducing the combustion performance. In addition, it is possible to prevent condensation water that has accumulated near the opening 13 in the exhaust flow passage 5 from penetrating into the main body 2 through the opening 13 of the exhaust flow passage 5, and to prevent the condensation water from adhering to the device main body 2, such as the casing 32 of the combustion device 30, and causing deterioration of the device main body 2.

However, if the exhaust flow passage portion 5 is pressed against the exhaust outlet 11 side by human force alone, the compression state of the packing 15 varies partially, and it is difficult to compress the packing 15 to a high compression state all around until the dimensional tolerance of each part is absorbed. According to this embodiment, the rear bulge portion 16 of the exhaust flow passage portion 5 is slid along the sliding guide portion 18 while being pushed in, so that the exhaust flow passage portion 5 can be easily and strongly pressed against the exhaust outlet 11 side, and the packing 15 can be compressed to a high compression state all around. Incidentally, in this embodiment, the compression rate of the packing 15 can be set to a high compression state of about 70% to 75%. On the other hand, if the packing 15 is compressed too strongly, there is a risk that the elasticity of the packing 15 itself will be lost. Therefore, as shown in FIG. 13, the flange 14 is provided with a receiving groove 14a in which the packing 15 is placed, and a protrusion 14b is provided on the outer periphery of this receiving groove 14a, and this protrusion 14b abuts against the side wall 6 of the main body 2 to prevent the packing 15 from being excessively compressed.

In addition, in this embodiment, the exhaust flow passage section 5 is configured as a bulging section 16 that bulges backward at the blocking section, which is the opposing wall of the opening 13. As a result, the bulging section 16 lengthens the exhaust flow passage section 5, and when the bulging section 16 is pushed into the sliding guide section 18, the exhaust flow passage section 5 is easily pressed down, making it easy to assemble the exhaust flow passage section 5. In addition, the bulging section 16 lengthens the flow path length of the combustion exhaust flowing through the exhaust flow passage section 5, so the flow rate of the combustion exhaust can be reduced. As a result, even if the exhaust outlet 11 tends to be blocked by a gust of wind, the packing 15 can prevent the combustion exhaust from leaking into the main body 2 from the opening 13 of the exhaust flow passage section 5. In addition, the slowing down of the flow rate of the combustion exhaust can prevent condensation water that has accumulated near the exhaust flow passage section 5 or the exhaust outlet 11 from being scattered outside from the exhaust outlet 11 by the combustion exhaust.

In this embodiment, the fixing portion 17 of the exhaust flow path portion 5 and the fixing base 19 of the main body 2 are fixed with a screw 17a, so that the bulge portion 16 of the exhaust flow path portion 5 is held in a state pressed toward the base end side of the sliding guide portion 18. The fixing direction by this screw 17a is the up-down direction, and is set to the horizontal direction in which the sliding guide portion 18 presses the exhaust flow path portion 5, that is, the direction intersecting the 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 exhaust outlet 11 side direction in which the sliding guide portion 18 presses the exhaust flow path portion 5, and the compression repulsion force of the packing 15 acts on the exhaust flow path portion 5 in the direction opposite to the exhaust outlet 11 side direction. The screw fixing direction of the exhaust flow path portion 5 is parallel to the screw-in direction of the screw 17a. If the screw fixing direction for the exhaust flow path portion 5 is set to a direction parallel to the compression direction of the packing 15, the compression repulsion force of the packing 15 acts in the direction in which the screw comes out. In this embodiment, the compressive repulsive force of the packing 15 acts on the exhaust flow passage section 5 in a direction intersecting the screw fixing direction, preventing the screw 17a from loosening and maintaining the fixation by the screw 17a. As a result, the exhaust flow passage section 5 assembled in a state pressed into the sliding guide section 18 is stably maintained in a state of being pressed against the exhaust outlet 11 by the sliding guide section 18 without shifting in the direction of escaping from the sliding guide section 18 due to the fixation of the screw 17a. Therefore, the packing 15 can be stably maintained in a high airtight state. In addition, the screw 17a is threaded in the same direction as the exhaust flow passage section 5 is pushed into the sliding guide section 18, so the assembly work of assembling the exhaust flow passage section 5 into the main body 2 can be easily performed.

The present invention is not limited to the above embodiment, and can be modified as desired within the scope of the 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 33 of the combustion device 30, and the air that flows 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, but either one of the air supply cylinder 41 or the ring-shaped air supply cylinder 42 may be closed and air may be supplied into the combustion device 30 only from the other, or only one of the air supply cylinder 41 or the ring-shaped air supply cylinder 42 may be provided on the top surface 33 of the combustion device 30.
(Industrial Applicability)

The exhaust adapter of the present invention is used as an exhaust adapter that is connected to a combustion device such as a water heater. For example, this exhaust adapter can be installed on the top surface of an indoor water heater and applied to an outdoor water heater. According to the present invention, an exhaust adapter is provided that can ensure high airtightness of the exhaust flow passage inside the exhaust adapter while improving the design from the front by creating a sense of unity with the water heater.

1 exhaust adapter, 2 main body, 3 exhaust fluid guide, 4 exhaust connection section, 5 exhaust flow path section, 6 side wall, 7 upper wall, 8 front cover, 9 air intake port, 10 guide plate, 11 exhaust outlet, 12 insertion protrusion, 13 opening, 14 flange, 15 packing, 16 bulge, 16a convex arc surface, 17 fixing section, 18 sliding guide section, 18a concave arc section, 18b receiving section, 19 fixing base, 20 notch, 21 hinge, 22 arm, 23 hinge shaft, 24 hinge clamping plate , 25 convex part, 26 concave part, 27 engaging piece, 28 engaging convex part, 30 combustion device, 31 open part, 32 casing, 33 top surface part, 34 front cover, 35 combustion part, 36 heat exchange part, 37 ventilation means, 38 air supply part, 39 exhaust part, 40 exhaust pipe, 41 air supply pipe, 42 ring-shaped air supply pipe, 43 fuel supply pipe, 44 water supply pipe, 45 hot water outlet pipe, 46 snap lock, 47 hook, 48 mounting part, 49 fixing piece, 51 fixing plate part, 52 fixing part, 60 receiving plate part

Claims

An exhaust adapter connected to a combustion device having a box-shaped device body forming an outer shell and an exhaust pipe protruding outward from the device body,
A box-shaped main body having an exhaust outlet for discharging combustion exhaust from the combustion device;
An exhaust guide fluid is provided in the main body and connects the exhaust pipe to the exhaust outlet;
an exhaust flow passage portion that constitutes a part of the exhaust fluid guide and has an opening portion that communicates with the exhaust outlet and a flange provided on an outer periphery of the opening portion;
a packing that is compressed and held between a flange of the exhaust flow path portion and an inner surface of the main body at an outer periphery of the exhaust outlet;
a sliding guide portion provided on an inner surface of the main body and pressed against an outer surface of a closing portion that is an opposing wall of the opening in the exhaust flow path,
The sliding guide portion is formed with a concave arc portion that is inclined toward the exhaust outlet side from the tip end side toward the base end side,
The exhaust flow path portion is fixed to the main body in a state where the outer surface of the blocking portion is formed into a convex arc-shaped surface, and the convex arc-shaped surface is pressed along the concave arc-shaped portion of the sliding guide portion.
2. The exhaust adapter of claim 1,
An exhaust adaptor, wherein the exhaust flow passage portion has an outwardly expanding bulging portion, and the bulging portion constitutes the blocking portion.
3. The exhaust adapter according to claim 1,
The exhaust passage portion is fixed to the main body by a screw,
An exhaust adapter, wherein the screw fixing direction is set to a direction intersecting the compression direction of the packing.