JP7195594B2 - Water heater - Google Patents

Description

The present invention relates to a water heater.

2. Description of the Related Art Conventionally, there is known a hot water heater having an exhaust portion at the top of a housing (see Patent Document 1, for example). The exhaust section is fixed to the upper side of the casing of the heat exchanger, and includes a cover-like exhaust casing that is open at the front and covers the left, right, and rear portions, and a rectifying plate provided inside the exhaust casing. The rectifying plate has a folded shape that slopes upward from the front end of the exhaust casing to the rear side on the heat exchanger side, extends upward, then folds forward, and further slopes downward toward the front. The current plate has such a folded shape to form an exhaust passage inside the exhaust casing.

JP 2018-31489 A

Since the rectifying plate has the above-described folded shape, there is a problem that when it is integrally formed, there are many processing steps and the cost becomes high. In order to solve this problem, for example, it is conceivable to reduce the cost by configuring the rectifying plate with a plurality of parts and connecting them at the folded portions. However, there is a possibility that the connection may be loosened due to vibration, impact, bending back of each component, etc. during transportation, and the pressure loss of the combustion exhaust within the exhaust casing may increase.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a water heater capable of firmly maintaining the connected state of a rectifying plate formed by connecting a plurality of parts.

The water heater according to claim 1 is provided above a heat exchanger that heats flowing water by heat of combustion exhaust from a burner, and a front portion protrudes forward from the heat exchanger, and the heat exchanger is positioned upward. an exhaust casing having an opening in the front portion for discharging the passing combustion exhaust to the outside; an exhaust pipe projecting forward from the opening and guiding the combustion exhaust discharged from the opening forward; and the exhaust casing. and a rectifying plate that is supported inside the heat exchanger and rectifies the combustion exhaust gas that has passed upward through the heat exchanger toward the opening, wherein the rectifying plate is arranged on the heat exchanger side and extends toward the front side. The rear ends of the lower plate portion that slopes upward toward the rear side and the upper plate portion that is positioned further away from the heat exchanger than the lower plate portion and slopes downward toward the front side from the rear side. The rear end portion of the lower plate portion is provided with a lower connecting portion bent upward, and the rear end portion of the upper plate portion is bent downward. One of the lower connecting portion and the upper connecting portion is formed with a plurality of tongue portions that are alternately shifted with respect to the front-rear direction, and the other is formed with a plurality of tongue portions arranged side by side in the left-right direction. a plurality of receiving portions corresponding to the plurality of tongue portions are formed so as to alternately face the front side and the rear side of the plurality of tongue portions, and the plurality of receiving portions are arranged in a horizontal direction; In contrast, the lower connecting portion and the upper connecting portion are connected to each other by inserting the plurality of tongue pieces so as to be shifted in the front-rear direction.

3. The water heater according to claim 2, wherein the rear end side of the side portion of the lower plate portion is provided with a first side portion projecting upward, and the rear end side of the side portion of the upper plate portion is provided downwardly. A second side surface portion is provided that protrudes and overlaps the first side surface portion in the left-right direction in a state in which the upper connection portion and the lower connection portion are connected to each other, and the first side surface portion has an engaging portion. It is preferable that an engaged portion with which the engaging portion engages is provided on the second side surface portion.

In the hot water heater of claim 3, it is preferable that a sandwiching portion for sandwiching the lower connecting portion and the upper connecting portion, which are connected to each other, from both sides in the vertical direction is provided inside the exhaust casing.

According to the water heater of claim 1, the lower plate side connecting portion and the upper plate side connecting portion are connected to each other by inserting the plurality of tongue portions into the plurality of receiving portions so as to be displaced in the front-rear direction. be. As a result, the stress in the same direction is applied to the lower plate portion and the upper plate portion in a distributed manner, so that the loosening of the connected state can be prevented. Therefore, it is possible to prevent the pressure loss in the exhaust casing from increasing while adopting an inexpensive structure.

According to the water heater of claim 2, the engaging portion provided on the first side surface portion of the lower plate portion and the engaged portion provided on the second side surface portion of the upper plate portion are engaged with each other. This facilitates temporary assembly of the lower plate portion and the upper plate portion. As a result, it is possible to improve work efficiency in the process of assembling the rectifying plate.

According to the water heater of claim 3, since the clamping portion clamps the lower connecting portion and the upper connecting portion from both sides in the vertical direction, separation of the lower plate portion and the upper plate portion within the exhaust casing can be prevented.

1 is a cross-sectional view of water heater 1. FIG. 3 is a perspective view of an exhaust section 30; FIG. 3 is a cross-sectional view of an exhaust section 30; FIG. 3 is a perspective view of a lower plate portion 51; FIG. 3 is a perspective view of an upper plate portion 52; FIG. 3 is a perspective view of a straightening plate 50; FIG. 3 is a cross-sectional perspective view of a straightening plate 50. FIG.

Embodiments of the present invention will be described below. Unless there is a specific description, the structure of the apparatus described below is merely an example of explanation and not intended to be limiting. The drawings are used to explain technical features that can be employed by the present invention. In the following description, left and right, front and rear, and top and bottom indicated by arrows in the drawings are used.

The structure of the water heater 1 will be described with reference to FIGS. 1 and 2. FIG. A water heater 1 includes a housing 2 and a front cover 8. - 特許庁An opening 7 is provided in the front surface of the housing 2 . A front cover 8 is detachable from the front surface of the housing 2 and closes the opening 7 . An exhaust pipe 9 protrudes forward from the upper portion of the front cover 8 (see FIG. 2), and an intake port (not shown) is provided at the lower portion. A bottom plate 4 of the housing 2 is provided with a hot water outlet 11 connected to an external hot water tap, a water inlet 12 to which a water pipe is connected from the outside, and a gas inlet (not shown) to which a gas pipe is connected from the outside. Brackets 16A and 16B for wall mounting are provided on the upper and lower portions of the back plate 6 of the housing 2, respectively.

A combustion section 18 , a heat exchanger 19 , and an exhaust section 30 are provided in this order from the bottom in the upper part of the housing 2 . The combustion section 18 is provided inside the burner-side casing 21 and has a plurality of burners 181 arranged in the left-right direction. An air supply fan 25 that supplies combustion air to the plurality of burners 181 is provided below the combustion section 18 .

The heat exchanger 19 is provided inside a heat exchanger-side casing 26 . The heat exchanger side casing 26 is fixed to the upper portion of the burner side casing 21 . The heat exchanger 19 has a plurality of heat transfer tubes 19A arranged parallel to each other and penetrating in the left-right direction through a plurality of laminated fins 20 spaced apart in the left-right direction. Adjacent heat transfer tubes 19A are connected to each other by a U-shaped connecting tube (not shown) to form a series of tubular bodies connected in a meandering manner. The downstream end of a water inlet pipe 27 connected to the water inlet 12 is connected to the upstream end of the pipe of the heat exchanger 19, and the hot water outlet pipe (illustrated) connected to the hot water outlet 11 is connected to the downstream end of the pipe. ) is connected. As the combustion exhaust gas from the combustion section 18 passes through the gaps between the heat transfer tubes 19A, heat is exchanged with the water passing through the heat transfer tubes 19A, and the water passing through the heat transfer tubes 19A is heated.

The exhaust section 30 includes an exhaust casing 40 and a current plate 50 (see FIG. 2). The exhaust casing 40 is fixed to the upper portion of the heat exchanger side casing 26 and communicates with the exhaust stack 9 . The front portion of the exhaust casing 40 protrudes forward from the heat exchanger 19 . The straightening plate 50 is supported inside the exhaust casing 40 and forms an exhaust passage for the combustion exhaust that has flowed into the exhaust casing 40 from the heat exchanger 19 .

The shape of the exhaust casing 40 will be described with reference to FIGS. 2 to 5. FIG. As shown in FIGS. 2 and 3, the exhaust casing 40 has a shape that bulges upward at the rear portion and gradually lowers toward the front. The exhaust casing 40 has an opening 400 (see FIG. 3) at the front. The opening 400 is substantially U-shaped opening downward when viewed from the front. The exhaust casing 40 includes, in order from the rear to the front, a curved portion 41, a top portion 42, a steeply inclined portion 43, and a gently inclined portion 44, and a pair of side portions 45 on both left and right sides thereof. The bending portion 41 bends forward while rising upward. The top portion 42 extends substantially horizontally forward from the front end portion of the curved portion 41 . The steep slope portion 43 slopes obliquely downward at a steep angle from the front end of the top portion 42 . The gently sloping portion 44 extends forward from the front end portion of the steeply sloping portion 43 at a gentler angle than the steeply sloping portion 43 . A pair of side surface portions 45 hang down from both left and right end portions of the curved portion 41 , the top portion 42 , the steeply inclined portion 43 , and the gently inclined portion 44 to form both left and right side surfaces of the exhaust casing 40 .

The exhaust casing 40 further includes a mounting flange portion 46 , an upper flange portion 47 , an outer folded portion 48 and a plurality of crimped portions 49 . The mounting flange portion 46 (see FIG. 3) is the front end portion of the exhaust casing 40 and is provided along the front end portion of the gently sloping portion 44 and the front end portions of the pair of side portions 45 . The mounting flange portion 46 (see FIGS. 3 and 5) protrudes outward in a flange shape and is formed in a substantially U-shape opening downward in a front view. The upper flange portion 47 is provided along the lower end portion of the curved portion 41 and the respective lower end portions of the pair of side portions 45 . The upper flange portion 47 protrudes outward in a flange shape and is formed in a substantially U-shape that opens forward in a bottom view. The outer folded portion 48 is provided along the outer peripheral portion of the upper flange portion 47 and folds downward to protrude. The crimping portion 49 is provided along the lower end portion of the outer folded portion 48 . A lower flange portion 261 (see FIG. 3) provided at the upper end portion of the heat exchanger side casing 26 is arranged below the upper flange portion 47, and each of the plurality of crimping portions 49 is bent inward and pressed. Fasten. Thereby, the exhaust casing 40 is fixed to the upper portion of the heat exchanger side casing 26 .

An upper clamping portion 451 and a lower clamping portion 452 are provided on each of the pair of side surface portions 45 . The upper holding portion 451 is provided near the top portion 42 of the side portion 45 and protrudes inward in a substantially rectangular shape. Note that the upper holding portion 451 is preferably formed by drawing. The lower clamping portion 452 is provided below and toward the rear of the upper clamping portion 451 and protrudes inward in a substantially rectangular shape. The upper surface of the lower clamping portion 452 slopes forward.

One end of a substantially L-shaped bracket 55 in a side view is fixed to the upper surface of the uppermost portion 42 with a screw 38 . The other end of the bracket 55 is fixed to the back plate 6 of the housing 2 with screws (not shown). Thereby, the exhaust casing 40 is fixed to the rear surface of the housing 2 .

The structure of the exhaust pipe 9 will be described with reference to FIGS. 2 and 3. FIG. The exhaust pipe 9 is fixed to the front part of the exhaust casing 40 and is formed in a substantially square tubular shape that protrudes forward. The front portion of the exhaust pipe 9 is provided with an annular open end portion 90 elongated in the left-right direction, and an exhaust outlet 92 is provided inside the open end portion 90 . The exhaust outlet 92 is formed in an oval shape that is long in the left-right direction when viewed from the front. A peripheral portion of the exhaust outlet 92 is provided with a burring portion 91 bent toward the inner rear side for injury prevention. Two loopholes 95 (see FIG. 2) are provided on both left and right sides of the lower portion of the open end 90 . As a result, the rainwater that has fallen into the exhaust pipe 9 is discharged to the outside through the loop hole 95 .

A rear end portion of the exhaust pipe 9 is provided with a flange portion 93 projecting outward in a flange shape. The flange portion 93 is formed in a substantially rectangular ring shape elongated in the left-right direction when viewed from the front. An inwardly folded crimping piece 94 is provided on the outer peripheral portion of the flange portion 93 (see FIG. 3). A mounting flange portion 46 provided at the front end portion of the exhaust casing 40 and a mounting piece 512 provided at the front end portion of a lower plate portion 51 of the rectifying plate 50 are arranged with respect to the rear surface of the flange portion 93 to increase the pressure. It is crimped with a tightening piece 94 . Thereby, the exhaust pipe 9 is fixed to the front end portion of the exhaust casing 40 and the front end portion of the lower plate portion 51 of the current plate 50 .

An exhaust outlet 92 of the exhaust stack 9 is arranged in front of the opening 400 of the exhaust casing 40 . Thereby, the exhaust pipe 9 can satisfactorily discharge the combustion exhaust gas flowing from the opening 400 of the exhaust casing 40 from the exhaust outlet 92 . The exhaust pipe 9 is inserted from the rear side into a pipe fixing hole (not shown) provided in the upper portion of the front cover 8 (see FIG. 1). Therefore, the exhaust pipe 9 is fixed in the upper part of the front cover 8 in a state of protruding forward.

The shape of the current plate 50 will be described with reference to FIGS. 3 to 7. FIG. As shown in FIGS. 3 and 6 , the current plate 50 includes a lower plate portion 51 , an upper plate portion 52 and a rain shield portion 100 . As shown in FIG. 4 , the lower plate portion 51 has a body portion 511 . The body portion 511 is formed in a substantially rectangular shape in a plan view, and is inclined obliquely upward from the front side to the rear side. At the front end of the main body 511, there is provided a mounting piece 512 that extends substantially horizontally toward the front and has a generally inverted L shape in a side view, the tip of which is bent downward at a substantially right angle.

A rear end portion of the body portion 511 is provided with a lower connecting portion 513 that bends upward at a substantially right angle. The lower connecting portion 513 includes four first receiving portions 71 and three second receiving portions 72 arranged alternately in the left-right direction. The first receiving portion 71 is a plate-like portion formed in an elongated substantially rectangular shape that is elongated in the vertical direction when viewed from the rear. Similarly to the first receiving portion 71, the second receiving portion 72 is also a plate-like portion formed in an elongated substantially rectangular shape that is elongated in the vertical direction when viewed from the rear, and is recessed forward from the first receiving portion 71. . The lower connecting portion 513 connects with an upper connecting portion 521 of the upper plate portion 52, which will be described later.

In the region on the front side of the lower plate portion 51, three support portions 517 (only one is shown in FIGS. 3 and 7) are provided at intervals in the left-right direction. The support portion 517 has a substantially rectangular shape in plan view and protrudes upward. The lower surface of the upper plate portion 52 described later contacts the upper surface of the support portion 517 . Thereby, the support portion 517 supports the upper plate portion 52 . Further, a pair of left and right protruding pieces 514 that protrude upward in a rib shape are provided at both left and right end portions of the main body portion 511 . Each protruding piece 514 is formed in a substantially rectangular shape elongated in the front-rear direction when viewed from the side. On the rear side of the upper end of each protruding piece 514, there is provided a side surface portion 515 which further protrudes upward and has a substantially rectangular shape in a side view. The pair of left and right side portions 515 are opposed to each other. An engaging protrusion 516 is provided at a substantially central portion of each side portion 515 . The engaging protrusion 516 is cut and raised so as to protrude inward, and is formed in a substantially triangular shape when viewed from the side.

As shown in FIG. 5 , the upper plate portion 52 is supported on the upper side of the lower plate portion 51 and has a substantially rectangular shape in plan view. The upper plate portion 52 includes an inclined portion 61, a horizontal portion 62, a rear inclined portion 63, and a front inclined portion 64 in order from the rear. The inclined portion 61 has a substantially rectangular shape elongated in the left-right direction in a plan view, and is inclined upward from the upper end portion of the upper connecting portion 521 (to be described later) toward the front side. The horizontal portion 62 has a substantially rectangular shape elongated in the horizontal direction in a plan view, extends substantially horizontally forward from the upper end portion of the inclined portion 61, and faces the lower surface of the uppermost portion 42 of the exhaust casing 40 (see FIG. 3). . Left and right ends of the horizontal portion 62 are provided with a pair of left and right side portions 66 extending downward. Each side portion 66 is formed in a substantially rectangular shape when viewed from the side, and a substantially rectangular opening portion 67 is provided in a substantially central portion thereof.

The rear inclined portion 63 has a substantially rectangular shape elongated in the horizontal direction in a plan view, and is inclined downward at a steep angle from the front end portion of the horizontal portion 62 . The inclination angle of the rear inclined portion 63 is substantially the same as the inclination angle of the steeply inclined portion 43 of the exhaust casing 40 . The rear inclined portion 63 is positioned below the steeply inclined portion 43 of the exhaust casing 40 and faces the lower surface thereof (see FIG. 3). The front inclined portion 64 has a substantially rectangular shape elongated in the horizontal direction in a plan view, and is inclined from the front end portion of the rear inclined portion 63 at a looser angle than the rear inclined portion 63 . A pair of substantially rectangular baffle plates 68 and 69 in a side view are erected on both left and right sides of the front portion of the front inclined portion 64 . The baffle plate portions 68 and 69 incline toward the central portion side in the left-right direction toward the front in plan view. As a result, the baffle plates 68 and 69 guide the combustion exhaust flowing from the exhaust passage of the exhaust casing 40 into the exhaust pipe 9 toward the central portion of the exhaust outlet 92 in the left-right direction.

An upper connecting portion 521 that bends downward is provided at the rear end portion of the inclined portion 61 . The upper connecting portion 521 includes four first tongue pieces 81 and three second tongue pieces 82 arranged alternately in the left-right direction. The first tongue portion 81 is a plate-like portion formed in an elongated substantially rectangular shape that is elongated in the vertical direction when viewed from the rear. Like the first tongue piece 81, the second tongue piece 82 is also a plate-like portion formed in an elongated substantially rectangular shape elongated in the vertical direction when viewed from the back. A gap is formed between the adjacent first tongue portion 81 and second tongue portion 82 . A method of connecting the upper connecting portion 521 and the lower connecting portion 513 of the lower plate portion 51 will be described later.

The rain cover 100 is fixed to the upper surface of the front inclined portion 64 . The rain shield part 100 is formed in a substantially rectangular shape elongated in the left-right direction in a plan view, and receives rainwater that is vigorously incident from the exhaust pipe 9 toward the current plate 50 in the exhaust casing 40 . The rainwater splashed back against the rain shield 100 collides with the lower surface of the gently sloping portion 44 of the exhaust casing 40 . The rainwater that collides with the lower surface of the gently sloping portion 44 drops onto the front side sloping portion 64 of the straightening plate 50 and flows toward the exhaust outlet 92 side. As a result, it is possible to prevent rainwater from passing over the rear part of the rectifying plate 50 and entering the housing 2 in the exhaust casing 40 . The rainwater that has flowed to the exhaust outlet 92 side is discharged to the outside through the two loopholes 95 of the open end portion 90 .

A method of assembling the current plate 50 and a method of installing it in the exhaust casing 40 will be described with reference to FIGS. 4 to 7. FIG. First, the upper plate portion 52 is arranged above the lower plate portion 51 . The upper connecting portion 521 of the upper plate portion 52 is inserted from above into the lower connecting portion 513 of the lower plate portion 51 . At this time, the four first tongue portions 81 and the three second tongue portions 82 of the upper connecting portion 521 are attached to the four first receiving portions 71 and the three second receiving portions 72 of the lower connecting portion 513. and slide it back and forth. Specifically, the four first tongue portions 81 are inserted along the front sides of the four first receiving portions 71, and the three second tongue portions 82 are inserted along the rear sides of the three second receiving portions 72. insert along The four first tongue portions 81 and the three second tongue portions 82 are alternately bent in the front-rear direction, and are attached to the front surfaces of the four first receiving portions 71 and the back surfaces of the three second receiving portions 72. close to each other.

Thereby, the upper connecting portion 521 can be firmly connected to the lower connecting portion 513 . Therefore, since the stress in the same direction is applied to the lower plate portion 51 and the upper plate portion 52 in a dispersed manner, it is possible to prevent loosening of the connection between the lower connecting portion 513 and the upper connecting portion 521 . Since the shape of the rectifying plate 50 can be stably maintained, a favorable flow of combustion exhaust gas in the exhaust casing 40 can be maintained. As a result, it is possible to prevent the pressure loss of the combustion exhaust in the exhaust casing 40 from increasing while adopting an inexpensive configuration.

Then, the pair of side surface portions 66 of the upper plate portion 52 are inserted from above into the inside of the pair of side surface portions 515 of the lower plate portion 51 . The right side surface portion 66 of the upper plate portion 52 overlaps the left surface of the right side surface portion 515 of the lower plate portion 51 . The left side surface portion 66 of the upper plate portion 52 overlaps the right surface of the left side surface portion 515 of the lower plate portion 51 . Furthermore, when the upper connecting portion 521 is connected to the lower connecting portion 513 , the openings 67 of the facing side portions 66 are engaged with the engaging projections 516 of the respective side portions 515 . As a result, the lower plate portion 51 and the upper plate portion 52 are firmly connected to each other at their respective rear portions, so that the lower plate portion 51 and the upper plate portion 52 can be easily assembled temporarily before being assembled to the exhaust casing 40 . Therefore, the work efficiency in the assembly process of the exhaust part 30 can be improved. Further, since the lower surface of the front inclined portion 64 of the upper plate portion 52 is placed on the upper surfaces of the three support portions 517 of the lower plate portion 51, the upper plate portion 52 is stably above the lower plate portion 51. supported by

The temporarily assembled current plate 50 is arranged in the exhaust casing 40 . At this time, the rear portion of the rectifying plate 50 is inserted from the front between the upper holding portion 451 and the lower holding portion 452 provided on the pair of left and right side portions 45 of the exhaust casing 40 . At this time, the upper surface of the horizontal portion 62 of the upper plate portion 52 of the current plate 50 is brought into contact with the lower surface of the upper holding portion 451 . The lower surface of the main body portion 511 of the lower plate portion 51 of the current plate 50 is brought into contact with the upper surface of the lower holding portion 452 . As a result, the upper clamping portion 451 and the lower clamping portion 452 sandwich and support the rear portion of the rectifying plate 50 from both upper and lower sides, so that the connection between the lower connecting portion 513 and the upper connecting portion 521 is further strengthened. Therefore, it is possible to reliably prevent the separation of the lower plate portion 51 and the upper plate portion 52 in the exhaust casing 40 .

As described above, the water heater 1 of this embodiment includes the exhaust casing 40 , the exhaust pipe 9 , and the current plate 50 . The exhaust casing 40 is provided above the heat exchanger 19, and has an opening 400 extending forward from the heat exchanger 19 and discharging combustion exhaust gas passing upward through the heat exchanger 19 to the outside. Prepare. The exhaust pipe 9 is connected to the opening 400 and protrudes forward in a cylindrical shape. The exhaust pipe 9 has an exhaust outlet 92 that is longer in the horizontal direction than in the vertical direction at the front, and exhausts the combustion exhaust discharged from the opening 400 to the outside. The straightening plate 50 is supported in the exhaust casing 40 and straightens the combustion exhaust that has passed through the heat exchanger 19 upward toward the opening 400 .

The current plate 50 includes a lower plate portion 51 and an upper plate portion 52 . The lower plate portion 51 is arranged on the heat exchanger 19 side and is inclined upward from the front side to the rear side. The upper plate portion 52 is arranged on the side farther from the heat exchanger 19 than the lower plate portion 51 and is inclined downward from the rear side to the front side. The straightening plate 50 is configured by connecting rear end portions of the lower plate portion 51 and the upper plate portion 52 to each other. A lower connecting portion 513 that is bent upward is provided at the rear end portion of the lower plate portion 51 . An upper connecting portion 521 bent downward is provided at the rear end portion of the upper plate portion 52 .

A plurality of first tongue pieces 81 and second tongue pieces 82 that are alternately displaced in the front-rear direction are formed in the upper connecting portion 521 so as to be aligned in the left-right direction. A first receiving portion 71 and a second receiving portion 72 are formed side by side in the left-right direction on the lower connecting portion 513 . The first receiving portion 71 and the second receiving portion 72 alternately face the front side of the first receiving portion 71 and the rear side of the second receiving portion 72 facing each other. By inserting the first tongue portion 81 and the second tongue portion 82 into the first receiving portion 71 and the second receiving portion 72 so as to be displaced in the front-rear direction, the lower connecting portion 513 and the upper connecting portion 521 are connected. are rigidly connected to each other. As a result, since the stress in the same direction is applied to the lower plate portion 51 and the upper plate portion 52 in a dispersed manner, it is possible to prevent loosening of the connected state. Therefore, it is possible to prevent the pressure loss of the combustion exhaust in the exhaust casing 40 from increasing while adopting an inexpensive configuration.

In the above description, the first tongue portion 81 and the second tongue portion 82 of the upper connecting portion 521 of the upper plate portion 52 are examples of the "tongue portion" of the present invention. The first receiving portion 71 and the second receiving portion 72 of the lower connecting portion 513 of the lower plate portion 51 are examples of the "receiving portion" of the present invention. The pair of side surface portions 515 of the lower plate portion 51 is an example of the "first side surface portion" of the present invention, and the pair of side surface portions 66 of the upper plate portion 52 is an example of the "second side surface portion" of the present invention. The engaging protrusion 516 provided on the side surface portion 515 is an example of the "engaging portion" of the present invention, and the opening 67 provided on the side surface portion 66 is an example of the "engaged portion" of the present invention. The upper holding portion 451 and the lower holding portion 452 provided on the pair of left and right side portions 45 of the exhaust casing 40 are examples of the "holding portion" of the present invention.

The present invention is not limited to the above embodiments, and various modifications are possible. The inclination angles, inclination shapes, and the like of the exhaust casing 40, the lower plate portion 51, and the upper plate portion 52 are not limited to those in the above embodiment, and can be freely changed.

In the straightening plate 50, the lower connecting portion 513 of the lower plate portion 51 includes four first receiving portions 71 and three second receiving portions 72, but the number and shape of each can be freely changed. The number of the first tongue portion 81 and the second tongue portion 82 of the upper connecting portion 521 of the upper plate portion 52 may correspond to the number of the first receiving portion 71 and the second receiving portion 72. . The shapes of the first receiving portion 71, the second receiving portion 72, the first tongue portion 81, and the second tongue portion 82 are not limited to those of the above embodiments.

A plurality of first receiving portions 71 and second receiving portions 72 are provided on the lower connecting portion 513 of the lower plate portion 51, and a plurality of first tongue portions 81 are provided on the upper connecting portion 521 of the upper plate portion 52. , and the second tongue portion 82 is provided. It may be provided in the upper connecting portion 521 .

The rain cover 100 fixed to the upper surface of the upper plate portion 52 of the current plate 50 may be omitted. The baffle plate portions 68 and 69 on both left and right sides of the upper plate portion 52 of the straightening plate 50 may also be omitted. The pair of side surface portions 515 of the lower plate portion 51 and the pair of side surface portions 66 of the upper plate portion 52 may also be omitted.

1 Water Heater 7 Opening 9 Exhaust Stack 19 Heat Exchanger 40 Exhaust Casing 45 Side Portion 50 Current Plate 51 Lower Plate Portion 52 Upper Plate Portion 66 Side Portion 67 Opening Portion 71 First Receiving Portion 72 Second Receiving Portion 81 First Tongue Part 82 Second tongue portion 181 Burner 451 Upper holding portion 452 Lower holding portion 513 Lower connecting portion 515 Side portion 516 Engagement protrusion 521 Upper connecting portion

Claims (3)

It is provided above a heat exchanger that heats the water flow with the heat of the combustion exhaust from the burner, and the front part projects forward from the heat exchanger, and the combustion exhaust that has passed upward through the heat exchanger is released to the outside. an exhaust casing with an exhaust opening in the front;
an exhaust pipe projecting forward from the opening and guiding forward the combustion exhaust discharged from the opening;
A water heater comprising a rectifying plate that is supported in the exhaust casing and rectifies the combustion exhaust that has passed upward through the heat exchanger toward the opening,
The current plate is
a lower plate portion disposed on the heat exchanger side and inclined upward from the front side to the rear side;
The lower plate portion is disposed on the side away from the heat exchanger and is configured by connecting the rear end portions of the upper plate portion and the upper plate portion that slopes downward from the rear side to the front side,
The rear end portion of the lower plate portion is provided with a lower connecting portion that is bent upward,
The rear end portion of the upper plate portion is provided with an upper connecting portion that is bent downward,
A plurality of tongue portions that are alternately displaced in the front-rear direction are formed side by side in the left-right direction on either one of the lower connection portion and the upper connection portion,
On the other hand, a plurality of receiving portions corresponding to the plurality of tongue portions are formed in a horizontal direction so as to alternately face the front side and the rear side of the plurality of tongue portions,
The water heater, wherein the lower connecting portion and the upper connecting portion are connected to each other by inserting the plurality of tongue pieces into the plurality of receiving portions so as to be offset in the front-rear direction. A first side surface portion protruding upward is provided on the rear end side of the side portion of the lower plate portion,
A second side portion projecting downward from the rear end side of the side portion of the upper plate portion and overlapping the first side portion in the left-right direction when the upper connecting portion and the lower connecting portion are connected to each other. is provided,
The first side surface portion is provided with an engaging portion,
2. The water heater according to claim 1, wherein the second side surface portion is provided with an engaged portion with which the engaging portion engages. Inside the exhaust casing,
3. The water heater according to claim 1, further comprising a clamping portion that sandwiches the lower connecting portion and the upper connecting portion that are connected to each other from both sides in the vertical direction.

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