JP2020098062A - Water heater - Google Patents

Abstract

To provide a water heater capable of firmly holding a connection state of a straightening plate formed by connecting a plurality of parts.SOLUTION: A straightening plate 50 in an exhaust casing is composed by connecting the respective rear end parts of a lower plate part 51 and an upper plate part 52 together. A lower side connection part 513 bent upward is provided to the rear end part of the lower plate part 51. An upper side connection part 521 bent downward is provided to the rear end part of the upper plate part 52. A first tongue piece part 81 and a second tongue piece part 82 alternately shifted relative to the front-back direction are formed side by side in the right and left direction in the upper side connection part 521. A first receiving part 71 and a second receiving part 72 are formed side by side in the right and left direction in the lower side connection part 513. The first receiving part 71 and the second receiving part 72 are alternately opposed to the opposed front side of the first receiving part 71 and the rear side of the second receiving part 72. The first tong piece part 81 and the second tong piece part 82 are inserted into the first receiving part 71 and the second receiving part 72 so as to be shifted in the front-back direction.SELECTED DRAWING: Figure 6

Description

The present invention relates to a water heater.

BACKGROUND ART Heretofore, there is known a water heater having an exhaust part on an upper part of a housing (see, for example, Patent Document 1). The exhaust unit is fixed to the upper side of the casing of the heat exchanger, and includes a cover-shaped exhaust casing having a front surface opened to cover the left and right and rear portions, and a rectifying plate provided inside the exhaust casing. The current plate has a folded shape in which the heat exchanger side is inclined upward from the front end of the exhaust casing to the rear side, extends upward, is then folded back toward the front side, and is further inclined downward toward the front. The straightening vane has such a folded shape to form an exhaust passage inside the exhaust casing.

JP, 2008-31489, A

Since the current plate has the above-mentioned folded shape, there is a problem in that, when integrally formed, the number of processing steps is large and the cost is high. In order to solve this problem, for example, it is conceivable to reduce the cost by constructing the current plate by a plurality of parts and connecting them at the folded portions. However, there is a possibility that the connected state becomes loose due to vibrations, shocks, and bending back of each component during transportation, resulting in a high pressure loss of the combustion exhaust gas in the exhaust casing.

An object of the present invention is to provide a water heater which can firmly hold the connected state of the current plate formed by connecting a plurality of parts.

The water heater according to claim 1 is provided above a heat exchanger that heats water by heat of combustion exhaust gas from a burner, and a front portion projects forward from the heat exchanger so that the heat exchanger moves upward. An exhaust casing having an opening in the front portion for discharging the passed combustion exhaust to the outside, an exhaust cylinder projecting forward from the opening and guiding the combustion exhaust discharged from the opening forward, the exhaust casing A water heater provided with a rectifying plate that rectifies the combustion exhaust gas that has passed through the heat exchanger upward toward the opening, wherein the rectifying plate is disposed on the heat exchanger side, and the front side The rear ends of the lower plate portion that inclines upward from the rear side to the rear side, and the upper plate portion that is disposed on the side farther from the heat exchanger than the lower plate portion and that inclines downward from the rear side to the front side. The lower plate portion is provided with a lower connecting portion that is bent upward, and the rear end portion of the upper plate portion is bent downward. A plurality of tongue pieces that are staggered with respect to the front-rear direction are formed side by side in one of the lower connection portion and the upper connection portion, and the other is provided in the other. A plurality of receiving portions corresponding to the plurality of tongue portions are formed side by side in the left-right direction so as to alternately face the front surface side and the rear surface side of the plurality of tongue portion portions, and the plurality of receiving portions. On the other hand, the lower connecting portion and the upper connecting portion are connected to each other by inserting the plurality of tongue portions so as to be displaced in the front-rear direction.

The water heater according to claim 2, wherein a first side surface portion protruding upward is provided on a rear end side of a side portion of the lower plate portion, and a first side surface portion protruding downward is provided on a rear end side of the side portion of the upper plate portion. A second side surface portion that overlaps with the first side surface portion in the left-right direction is provided in a state of protruding and the upper side connecting portion and the lower side connecting portion are connected to each other, and the first side surface portion has an engaging portion. An engaged portion with which the engaging portion is engaged may be provided on the second side surface portion.

In the water heater of the third aspect of the present invention, inside the exhaust casing, it is preferable to provide a sandwiching 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.

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 pieces into the plurality of receiving portions so as to be displaced in the front-rear direction. It As a result, the stress applied to the lower plate portion and the upper plate portion in the same direction is dispersed and applied, so that the loosened connection state can be prevented. Therefore, it is possible to prevent an increase in pressure loss into the exhaust casing while taking 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. Thus, it becomes easy to temporarily assemble the lower plate portion and the upper plate portion. Thereby, the work efficiency in the assembly process of the current plate can be improved.

According to the water heater of claim 3, since the sandwiching portion sandwiches the lower connecting portion and the upper connecting portion from both sides in the vertical direction, it is possible to prevent the lower plate portion and the upper plate portion from being separated in the exhaust casing.

It is sectional drawing of the water heater 1. 3 is a perspective view of an exhaust unit 30. FIG. 3 is a cross-sectional view of the exhaust unit 30. It is a perspective view of the lower plate part 51. FIG. 6 is a perspective view of an upper plate portion 52. 6 is a perspective view of a current plate 50. FIG. 6 is a cross-sectional perspective view of the current plate 50. FIG.

Hereinafter, embodiments of the present invention will be described. Unless otherwise specified, the structure of the device described below is not intended to be limited thereto and is merely an example. The drawings are used for explaining the technical features that can be adopted by the present invention. In the following description, left and right, front and rear, and up and down indicated by arrows in the drawing will be used.

The structure of the water heater 1 will be described with reference to FIGS. 1 and 2. The water heater 1 includes a housing 2 and a front cover 8. An opening 7 is provided on the front surface of the housing 2. The front cover 8 is removable from the front surface of the housing 2 and closes the opening 7. An exhaust pipe 9 projects forward (see FIG. 2) at the upper part of the front cover 8 and an intake port (not shown) is provided at the lower part. The 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 connected to a water pipe from the outside, and a gas inlet (not shown) connected to a gas pipe from the outside. Metal fittings 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 unit 18, a heat exchanger 19, and an exhaust unit 30 are provided in this order from the bottom in the upper part of the housing 2. The combustion section 18 is provided in the burner side casing 21, and includes a plurality of burners 181 arranged side by side 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 unit 18.

The heat exchanger 19 is provided in the heat exchanger side casing 26. The heat exchanger side casing 26 is fixed to the upper part of the burner side casing 21. The heat exchanger 19 has a plurality of heat transfer tubes 19A which are arranged in parallel with each other so as to pass through the fins 20 in which a plurality of laminated sheets are stacked at a predetermined interval in the left-right direction and which are arranged in parallel with each other. The adjacent heat transfer tubes 19A are connected by a U-shaped connecting tube (not shown) to form a series of tube bodies connected in a meandering shape. The upstream end of the pipe of the heat exchanger 19 is connected to the downstream end of the water inlet pipe 27 connected to the water inlet 12, and the downstream end of the pipe is connected to the outlet port 11 (shown in the figure). Is omitted) is connected. When the combustion exhaust gas from the combustion section 18 passes through the gap between the heat transfer tubes 19A, heat exchange is performed with the water passing through the heat transfer tubes 19A, and the water passing through the heat transfer tubes 19A is heated.

The exhaust unit 30 includes an exhaust casing 40 and a rectifying 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 pipe 9. A front portion of the exhaust casing 40 projects forward of the heat exchanger 19. The baffle plate 50 is supported in the exhaust casing 40, and forms an exhaust passage for the combustion exhaust flowing into the exhaust casing 40 from the heat exchanger 19.

The shape of the exhaust casing 40 will be described with reference to FIGS. 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) in the front part. The opening 400 has a substantially U-shape that opens downward when viewed from the front. The exhaust casing 40 includes a curved portion 41, an uppermost portion 42, a steep slope portion 43, and a gentle slope portion 44 in order from the rear to the front, and includes a pair of side surface portions 45 on the left and right sides thereof. The bending portion 41 bends forward while rising upward. The uppermost portion 42 extends substantially horizontally from the front end of the curved portion 41 toward the front. The steeply inclined portion 43 inclines obliquely downward from the front end of the uppermost portion 42 at a steep angle. The gently sloping portion 44 inclines from the front end portion of the steeply sloping portion 43 at a gentler angle than the steeply sloping portion 43 and extends forward. The pair of side surface portions 45 hang down from the left and right ends of the curved portion 41, the uppermost portion 42, the steeply inclined portion 43, and the gently inclined portion 44, and form the 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 swaging portions 49. The mounting flange portion 46 (see FIG. 3) is a front end portion of the exhaust casing 40 and is provided along the front end portion of the gently inclined portion 44 and the front end portions of the pair of side surface portions 45. The mounting flange portion 46 (see FIGS. 3 and 5) is formed in a substantially U-shape that protrudes outward in a flange shape and opens downward in a front view. The upper flange portion 47 is provided along the lower end portion of the curved portion 41 and the lower end portions of the pair of side surface portions 45. The upper flange portion 47 is formed in a substantially U-shape that protrudes outward in a flange shape and opens frontward in bottom view. The outer folded portion 48 is provided along the outer peripheral portion of the upper flange portion 47, and is folded back and protrudes. The crimp portion 49 is provided along the lower end portion of the outer folding portion 48. The lower flange portion 261 (see FIG. 3) provided at the upper end of the heat exchanger side casing 26 is arranged below the upper flange portion 47, and each of the plurality of caulking portions 49 is bent inward to apply pressure. Tighten and fix. As a result, the exhaust casing 40 is fixed to the upper part of the heat exchanger side casing 26.

An upper sandwiching portion 451 and a lower sandwiching portion 452 are provided on each of the pair of side surface portions 45. The upper sandwiching portion 451 is provided in the vicinity of the uppermost portion 42 of the side surface portion 45 and projects inward in a substantially rectangular shape. Note that the upper holding portion 451 may be formed by drawing. The lower sandwiching portion 452 is provided below the upper sandwiching portion 451 and near the rear, and projects inward in a substantially rectangular shape. The upper surface of the lower holding part 452 is inclined downward to the front side.

One end of a bracket 55, which is substantially L-shaped in 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 a screw (not shown). As a result, the exhaust casing 40 is fixed to the back surface of the housing 2.

The structure of the exhaust stack 9 will be described with reference to FIGS. 2 and 3. The exhaust pipe 9 is fixed to the front portion of the exhaust casing 40, and is formed in a substantially rectangular tube shape protruding forward. An annular open end 90 that is long in the left-right direction is provided at the front of the exhaust pipe 9, and an exhaust outlet 92 is provided inside the open end 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 burring portion 91 for preventing damage is provided on the peripheral edge of the exhaust outlet 92 and is bent inward and rearward. Two through holes 95 (see FIG. 2) are provided on the left and right sides of the lower side of the opening end 90. As a result, the rainwater that has fallen into the exhaust stack 9 is discharged to the outside through the through hole 95.

At the rear end portion of the exhaust pipe 9, a flange portion 93 that protrudes outward in a flange shape is provided. The flange portion 93 is formed in a generally rectangular ring shape in a front view that is long in the left-right direction. A crimping piece 94 that is folded back inward is provided on the outer peripheral portion of the flange portion 93 (see FIG. 3 ). On the rear surface of the flange portion 93, the mounting flange portion 46 provided at the front end portion of the exhaust casing 40 and the mounting piece 512 provided at the front end portion of the lower plate portion 51 of the rectifying plate 50, which will be described later, are arranged. It is crimped with a fastening piece 94. As a result, the exhaust pipe 9 is fixed to the front end of the exhaust casing 40 and the front end of the lower plate portion 51 of the straightening plate 50.

The exhaust outlet 92 of the exhaust pipe 9 is arranged in front of the opening 400 of the exhaust casing 40. As a result, the exhaust stack 9 can satisfactorily discharge the combustion exhaust flowing from the opening 400 of the exhaust casing 40 from the exhaust outlet 92. The exhaust pipe 9 is inserted from the back side into a cylinder fixing hole (not shown) provided in the upper portion of the front cover 8 (see FIG. 1). Therefore, the exhaust pipe 9 is fixed at the upper portion of the front cover 8 so as to project forward.

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

At the rear end of the main body 511, a lower connecting portion 513 that is bent upward at a substantially right angle is provided. The lower connecting portion 513 includes four first receiving portions 71 and three second receiving portions 72 alternately arranged in the left-right direction. The first receiving portion 71 is a plate-like portion that is formed in an elongated rectangular shape that is long 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 rectangular shape that is long in the up-down direction when viewed from the rear, and is formed to be recessed to the front side of the first receiving portion 71. .. The lower side connecting portion 513 is connected to an upper side connecting portion 521 of the upper plate portion 52, which will be described later.

In the area 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 a plan view and protrudes upward. The lower surface of the upper plate portion 52, which will be 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 projecting pieces 514 projecting upward in a rib shape are provided at both left and right ends of the main body 511. Each protruding piece 514 is formed in a substantially rectangular shape that is long in the front-rear direction in a side view. On the rear side of the upper end portion of each projecting piece 514, a side surface portion 515 having a substantially rectangular shape in a side view further protruding upward is provided. The pair of left and right side surface portions 515 face each other. An engagement protrusion 516 is provided at a substantially central portion of each side surface portion 515. The engagement protrusion 516 is cut and raised so as to protrude inward, and is formed in a substantially triangular shape in a side view.

As shown in FIG. 5, the upper plate portion 52 is supported on the upper side of the lower plate portion 51 and is formed in a substantially rectangular shape in a 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 that is long in the left-right direction in a plan view, and inclines upward from the upper end of an upper coupling portion 521, which will be described later. The horizontal portion 62 has a substantially rectangular shape that is long in the left-right direction in plan view, extends substantially horizontally from the upper end of the inclined portion 61 toward the front side, and faces the lower surface of the uppermost portion 42 of the exhaust casing 40 (see FIG. 3 ). .. A pair of left and right side surface portions 66 extending downward are provided at both left and right ends of the horizontal portion 62. Each side surface portion 66 is formed in a substantially rectangular shape in a side view, and a substantially rectangular opening 67 is provided at a substantially central portion thereof.

The rear-side inclined portion 63 has a substantially rectangular shape that is long in the left-right direction in plan view, and is inclined obliquely downward from the front end of the horizontal portion 62 at a steep angle. The inclination angle of the rear inclined portion 63 is substantially the same as the inclination angle of the steep inclined portion 43 of the exhaust casing 40. The rear inclined portion 63 is located below the steep inclined portion 43 of the exhaust casing 40 and faces the lower surface thereof (see FIG. 3 ). The front sloped portion 64 has a substantially rectangular shape that is long in the left-right direction in plan view, and inclines from the front end of the rear sloped portion 63 at a lesser angle than the rear sloped portion 63. A pair of baffle plates 68 and 69, which are substantially rectangular in a side view, are erected on both left and right sides of the front side of the front sloped portion 64. The baffle portions 68 and 69 incline toward the central portion in the left-right direction as they face forward in a plan view. As a result, the baffle portions 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 of the inclined portion 61. The upper connecting portion 521 includes four first tongue pieces 81 and three second tongue pieces 82 alternately arranged in the left-right direction. The first tongue piece portion 81 is a plate-like portion formed in an elongated rectangular shape that is long in the vertical direction when viewed from the rear. Similarly to the first tongue piece portion 81, the second tongue piece portion 82 is also a plate-like portion formed in an elongated rectangular shape that is long in the up-down direction when viewed from the rear. A gap is formed between the adjacent first tongue piece portion 81 and second tongue piece 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 shield 100 is fixed to the upper surface of the front sloped portion 64. The rain shelter 100 is formed in a substantially rectangular shape that is long in the left-right direction in a plan view, and receives rainwater that is vigorously incident from the exhaust pipe 9 toward the flow straightening plate 50 in the exhaust casing 40. The rainwater that hits the rain shield 100 and bounces backwards collides with the lower surface of the gently inclined portion 44 of the exhaust casing 40. The rainwater that collides with the lower surface of the gently inclined portion 44 drops onto the front inclined portion 64 of the straightening vane 50 and flows toward the exhaust outlet 92 side. Thereby, in the exhaust casing 40, it is possible to prevent rainwater from entering the housing 2 beyond the rear portion of the straightening plate 50. The rainwater flowing to the exhaust outlet 92 side is discharged to the outside from the two through holes 95 of the opening end 90.

A method for assembling the current plate 50 and a method for installing the current plate 50 in the exhaust casing 40 will be described with reference to FIGS. 4 to 7. First, the upper plate portion 52 is arranged on the upper side of the lower plate portion 51. The upper connecting portion 521 of the upper plate portion 52 is inserted into the lower connecting portion 513 of the lower plate portion 51 from above. At this time, the four first tongue pieces 81 and the three second tongue pieces 82 of the upper connecting portion 521 are set to the four first receiving portions 71 and the three second receiving portions 72 of the lower connecting portion 513. And insert it so that it shifts in the front-back direction. Specifically, the four first tongue pieces 81 are inserted along the front sides of the four first receiving portions 71, and the three second tongue pieces 82 are attached to the rear sides of the three second receiving portions 72. Insert along. The four first tongue pieces 81 and the three second tongue pieces 82 are arranged on the front surface of the four first receiving portions 71 and the back surface of the three second receiving portions 72 in a state of being alternately bent in the front-rear direction. Closely contact each other.

Accordingly, the upper connecting portion 521 can be firmly connected to the lower connecting portion 513. Therefore, since stress in the same direction of the lower plate portion 51 and the upper plate portion 52 is dispersed and applied, it is possible to prevent the connected state of the lower connecting portion 513 and the upper connecting portion 521 from being loosened. Since the shape of the current plate 50 can be stably maintained, a favorable flow of combustion exhaust gas in the exhaust casing 40 can be maintained. From this, it is possible to prevent the pressure loss of the combustion exhaust gas in the exhaust casing 40 from increasing while adopting an inexpensive structure.

Then, the pair of side surface portions 66 of the upper plate portion 52 are inserted from above and arranged inside 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. Further, when the upper connecting portion 521 is connected to the lower connecting portion 513, the opening 67 of the facing side surface portion 66 engages with the engaging protrusion 516 of each side surface portion 515. Accordingly, the lower plate portion 51 and the upper plate portion 52 are firmly connected to each other at their rear portions, so that the lower plate portion 51 and the upper plate portion 52 can be easily temporarily assembled 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 side 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 stable above the lower plate portion 51. Supported.

The temporarily assembled straightening plate 50 is arranged in the exhaust casing 40. At this time, the rear part of the straightening plate 50 is inserted from the front between the upper holding part 451 and the lower holding part 452 provided on the pair of left and right side surfaces 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 straightening 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. Accordingly, the upper holding portion 451 and the lower holding portion 452 sandwich and support the rear portion of the straightening plate 50 from both upper and lower sides, so that the lower connecting portion 513 and the upper connecting portion 521 are further firmly connected. Therefore, it is possible to reliably prevent the lower plate part 51 and the upper plate part 52 from being separated from each other in the exhaust casing 40.

As described above, the water heater 1 of the present 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 a front portion projecting forward of the heat exchanger 19 and an opening 400 for discharging the combustion exhaust gas passing through the heat exchanger 19 to the outside. Prepare The exhaust pipe 9 is connected to the opening 400 and projects forward in a tubular shape. The exhaust pipe 9 has an exhaust outlet 92 that is longer in the left-right direction than in the vertical direction at the front part, and discharges the combustion exhaust gas discharged from the opening 400 to the outside. The rectifying plate 50 is supported in the exhaust casing 40 and rectifies the combustion exhaust gas 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 inclines 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 current plate 50 is configured by connecting the rear end portions of the lower plate portion 51 and the upper plate portion 52 to each other. At the rear end portion of the lower plate portion 51, a lower connecting portion 513 bent upward is provided. An upper connecting portion 521 bent downward is provided at a rear end portion of the upper plate portion 52.

A plurality of first tongue pieces 81 and second tongue pieces 82, which are staggered in the front-rear direction, are formed side by side in the left-right direction on the upper coupling portion 521. 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 are alternately opposed to the front surface side of the first receiving portion 71 and the rear surface side of the second receiving portion 72 which face each other. By inserting the first tongue piece portion 81 and the second tongue piece 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 inserted. Are firmly connected to each other. As a result, stress in the same direction of the lower plate portion 51 and the upper plate portion 52 is dispersed and applied, so that it is possible to prevent the connected state from loosening. Therefore, it is possible to prevent an increase in pressure loss of the combustion exhaust gas inside the exhaust casing 40, while taking an inexpensive configuration.

In the above description, the first tongue piece portion 81 and the second tongue piece portion 82 of the upper connection portion 521 of the upper plate portion 52 are examples of the “tongue piece portion” in 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” in the present invention. The pair of side surface portions 515 of the lower plate portion 51 are examples of the “first side surface portion” of the present invention, and the pair of side surface portions 66 of the upper plate portion 52 are an example of the “second side surface portion” of the present invention. The engagement protrusion 516 provided on the side surface portion 515 is an example of the “engagement portion” in the present invention, and the opening portion 67 provided in the side surface portion 66 is an example of the “engaged portion” in the present invention. The upper sandwiching portion 451 and the lower sandwiching portion 452 provided on the pair of left and right side surface portions 45 of the exhaust casing 40 are examples of the “sandwiching portion” in the present invention.

The present invention is not limited to the above embodiment, and various modifications can be made. The inclination angles, the 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 current 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 numbers of the first tongue piece portion 81 and the second tongue piece portion 82 of the upper connecting portion 521 of the upper plate portion 52 may correspond to the numbers of the first receiving portion 71 and the second receiving portion 72, respectively. .. The shapes of the first receiving portion 71, the second receiving portion 72, the first tongue piece portion 81, and the second tongue piece portion 82 are not limited to those in the above embodiment.

The lower connecting portion 513 of the lower plate portion 51 is provided with a plurality of first receiving portions 71 and the second receiving portion 72, and the upper connecting portion 521 of the upper plate portion 52 has a plurality of first tongue pieces 81. The second tongue piece portion 82 is provided, and the plurality of first tongue piece portions 81 and the second tongue piece portion 82 are provided in the lower connecting portion 513, and the plurality of first receiving portions 71 and the second receiving portion 72 are provided. You may provide in the upper side connection part 521.

The rain shield part 100 fixed to the upper surface of the upper plate part 52 of the current plate 50 may be omitted. The baffle plates 68 and 69 on both the left and right sides of the upper plate portion 52 of the current plate 50 may 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.

DESCRIPTION OF SYMBOLS 1 Water heater 7 Opening 9 Exhaust pipe 19 Heat exchanger 40 Exhaust casing 45 Side part 50 Rectifier plate 51 Lower plate part 52 Upper plate part 66 Side part 67 Opening part 71 First receiving part 72 Second receiving part 81 First tongue piece Part 82 Second tongue part 181 Burner 451 Upper clamping part 452 Lower clamping part 513 Lower coupling part 515 Side part 516 Engagement protrusion 521 Upper coupling part

Claims (3)

The combustion exhaust gas is provided above the heat exchanger that heats the water flow by the heat of the combustion exhaust gas from the burner, the front portion of the heat exchanger is projected forward of the heat exchanger, and the combustion exhaust gas that has passed through the heat exchanger is exposed to the outside. An exhaust casing having an opening for discharging in the front portion,
An exhaust pipe that projects forward from the opening and guides the combustion exhaust discharged from the opening forward,
A water heater provided in the exhaust casing, comprising: a rectifying plate that rectifies the combustion exhaust gas that has passed through the heat exchanger upward toward the opening,
The current plate is
A lower plate portion arranged on the heat exchanger side and inclined upward from the front side to the rear side,
It is arranged on the side farther from the heat exchanger than the lower plate portion, and is configured by connecting the respective rear end portions of the upper plate portion and the upper plate portion that are inclined downward from the rear side to the front side,
At the rear end portion of the lower plate portion, a lower connecting portion that is bent upward is provided,
An upper connecting portion bent downward is provided at the rear end portion of the upper plate portion,
In either one of the lower side connecting portion and the upper side connecting portion, a plurality of tongue pieces that are staggered in the front-rear direction are formed side by side in the left-right direction,
On the other hand, a plurality of receiving portions corresponding to the plurality of tongue pieces are formed side by side in the left-right direction so as to alternately face the front surface side and the rear surface side of the plurality of tongue pieces,
The water heater, wherein the lower connecting portion and the upper 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. On the rear end side of the side portion of the lower plate portion, a first side surface portion protruding upward is provided,
On the rear end side of the side portion of the upper plate portion, a second side surface portion that protrudes downward 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. Is provided,
An engagement portion is provided on the first side surface portion,
The water heater according to claim 1, wherein an engaged portion with which the engaging portion engages is provided on the second side surface portion. Inside the exhaust casing,
The water heater according to claim 1 or 2, further comprising a sandwiching portion sandwiching the lower coupling portion and the upper coupling portion that are coupled to each other from both sides in a vertical direction.

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