JP7250309B2 - 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 middle casing of the heat exchanger and includes a cover-like exhaust casing with an open front surface covering the left, right, and rear portions, and a rectifying plate provided inside the exhaust casing.

JP 2018-31489 A

However, in the water heater described in Patent Document 1, when rainwater intrudes into the exhaust part at a shallow angle, rainwater does not collide with the inner wall of the exhaust casing and the straightening vanes, and the straightening vanes do not reach the inside wall of the exhaust casing as compared with the case where the intrusion angle is deep. There was a possibility that rainwater could enter the back side of the exhaust casing beyond the rear part. In particular, as water heaters become thinner, the length of the exhaust casing in the front-to-rear direction becomes shorter, or when the passage area is widened in order to suppress combustion noise and combustion vibration, the possibility of this becomes even higher. is expected.

SUMMARY OF THE INVENTION An object of the present invention is to provide a water heater capable of preventing rainwater that has entered an exhaust casing from entering the water heater over the rear part of the current plate.

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 gas; and an exhaust casing projecting forward from the opening and discharging the combustion exhaust gas discharged from the opening to the outside from an exhaust outlet formed in the front end portion. and a rectifying plate that is supported in the exhaust casing, receives the combustion exhaust that has passed upward through the heat exchanger, and rectifies it toward the opening, wherein the rectifying plate: a lower plate portion that slopes obliquely upward from the front side to the rear side; and an upper plate portion extending toward the upper plate portion, and a rain shield portion is provided on the upper surface of the upper plate portion to receive rainwater incident from the outside through the exhaust outlet , and the rain shield portion comprises a support plate which is substantially rectangular in plan view, and a support plate which hangs down from both left and right ends of the support plate, and whose lower ends are fixed to the upper surface so that the support plate is positioned above the upper surface. and a pair of left and right support portions that support the support plate, and a passage is formed on the lower side of the receiving plate for passing a part of the combustion exhaust flowing in the exhaust casing toward the opening. do.

In the water heater according to claim 2, a virtual line extending from the exhaust outlet of the exhaust pipe to the upper surface of the upper plate portion is a virtual incident line on which the rainwater enters from the outside through the exhaust outlet, and the virtual incident line is A virtual line reflected at the same angle as the virtual incident line at the virtual intersection of the line and the upper surface of the upper plate portion is defined as a virtual reflected line on which the rainwater is reflected, and the incident angle of the virtual incident line decreases from the larger one. When the imaginary reflection line is the upper surface of the upper plate portion and first contacts the portion excluding the imaginary intersection point when the virtual reflection line is changed in the direction of , The rain shield is preferably provided so as to cover at least the upper part of the reference point.

The exhaust casing of the hot water heater according to claim 3 has a rear curved portion that rises upward at the rear portion and extends curved forward, and an inclined portion that slopes downward from the front portion of the rear curved portion toward the exhaust outlet. The rain shield may be provided at a height position where the rainwater incident on and reflected from the upper surface of the rain shield collides with the lower surface of the inclined portion of the exhaust casing.

The upper plate portion of the hot water heater according to claim 4 includes a first inclined portion which is steeper downward than the lower plate portion toward the front side, and a first inclined portion from the front end portion of the first inclined portion. and a second inclined portion that slopes downward at a gentler slope and extends toward the lower edge portion of the opening, and the rain protection portion is preferably provided on the second inclined portion.

In the water heater according to claim 5, the rain shield may be provided below an intermediate portion in the height direction between the upper surface of the upper plate portion and the lower surface of the exhaust casing facing the upper surface.

According to the water heater of claim 1, even if rainwater enters the exhaust casing at a shallow angle through the exhaust outlet of the exhaust stack, the rainwater is more likely to enter the exhaust outlet side than in the case where there is no rain cover, and Light is reflected at a position above the upper plate. Therefore, since rainwater collides with the upper portion of the exhaust casing, it is possible to prevent rainwater from entering the water heater beyond the rear portion of the exhaust portion. Regarding "rainwater entering the exhaust casing at a shallow angle", the closer it is to the vertical drop direction, the deeper the incident angle to the exhaust outlet, and the closer to the horizontal direction, the shallower the incident angle to the exhaust outlet. means. Also, the shallower the incident angle with respect to the exhaust outlet, the smaller the incident angle with respect to the upper plate portion of the current plate.

According to the water heater of claim 2, when the incident angle of the virtual incident line is changed from large to small, the virtual intersection point on the upper plate portion when the virtual reflected line first contacts the upper surface of the upper plate portion is a reference point, and a rain cover is provided so as to cover the upper part. As a result, the rainwater that would have entered the inner side of the exhaust casing in the absence of the rainshield can be received by the rainshield, so that the rainwater can reliably collide with the upper portion of the exhaust casing.

According to the water heater of claim 3, rainwater reflected on the upper surface of the rain shield collides with the lower surface of the inclined portion of the lower surface of the exhaust casing and flows along the lower surface of the inclined portion toward the exhaust outlet side. As a result, it is possible to prevent rainwater from entering the water heater over the rear portion of the rectifying plate.

According to the water heater of claim 4, since the rain shield is provided on the gently sloping portion, it is possible to lengthen the run-up distance for the combustion exhaust gas folded forward at the rear portion of the upper plate portion to move to the rain shield. Therefore, it is possible to prevent the rain shield from obstructing the flow of the combustion exhaust gas, so that the combustion exhaust gas can be smoothly discharged from the exhaust port.

According to the water heater of claim 5, since it is possible to prevent the flow of the combustion exhaust passing above the upper plate portion from being obstructed, the combustion exhaust can be discharged smoothly.

1 is a cross-sectional view of water heater 1. FIG. 3 is a cross-sectional view around an exhaust unit 30. FIG. 3 is a plan view of a rectifying plate 50; FIG. FIG. 4 is a diagram showing the paths of rainwater A1 and A2 that have fallen into the exhaust casing 40 (the rain cover is omitted). FIG. 4 is a diagram showing the paths of rainwater A3, A4, and A5 that have fallen into the exhaust casing 40 (rain shields are omitted). 4 is a diagram showing a virtual incident line P, reflection points Q1 and Q2, and virtual reflection lines R1 and R2 of rainwater that has fallen into the exhaust casing 40. 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 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, 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.

An inner body 17 is provided in the upper part inside the housing 2 . The inner shell 17 includes a burner unit 18, a heat exchanger 19, and an exhaust section 30 in this order from the bottom. The burner unit 18 has a lower casing 21 that communicates with the heat exchanger 19, and has a plurality of burners 181 arranged in the horizontal direction in the lower part of the lower casing 21. As shown in FIG. A nozzle base 22 is provided on the front side of the lower casing 21 . The nozzle base 22 is installed toward the rear end of the mixing pipe 182 provided in each burner 181, and supports a nozzle 221 connected to the gas inlet via a gas pipe (not shown). An air supply fan 25 for supplying combustion air to each burner group is provided below the burner unit 18 .

The heat exchanger 19 has a plurality of heat transfer tubes 19A arranged in parallel inside the middle casing 26, penetrating a plurality of fins (not shown) laminated in the left-right direction at predetermined intervals. Adjacent heat transfer tubes 19A are connected to each other by a U-shaped connecting tube (not shown) outside the middle casing 26 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 burner unit 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 . The exhaust casing 40 is fixed to the upper portion of the middle casing 26 and communicates with the exhaust pipe 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 FIG. 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 at the front. The opening 400 is substantially U-shaped opening downward when viewed from the front. The exhaust casing 40 has a curved portion 41, a top portion 42, a steeply inclined portion 43, and a gently inclined portion 44 in order from the rear to the front, and a pair of side portions 45 (the left side portion in FIG. 2) on both left and right sides thereof. 45 is shown). 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 crimp portion 49 . The mounting flange portion 46 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 protrudes outward in a flange shape and is formed in a substantially U-shape that opens downward when viewed from the front. 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 provided at the upper end portion of the middle casing 26 is arranged below the upper flange portion 47, and the crimp portion 49 is bent inward and crimped and fixed. Thereby, the exhaust casing 40 is fixed to the upper portion of the middle 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. The lower surface of the upper clamping portion 451 is in contact with the upper surface of an upper plate portion 52 of the straightening plate 50 , which will be described later. 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. The lower surface of the lower clamping portion 452 is in contact with the lower surface of the lower plate portion 51 of the current plate 50 , which will be described later. As a result, the upper holding portion 451 and the lower holding portion 452 sandwich and support the rear portion of the current plate 50 from both upper and lower sides.

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 shape of the current plate 50 will be described with reference to FIGS. 2 and 3. FIG. The straightening plate 50 includes a lower plate portion 51 , an upper plate portion 52 and a rain shield portion 80 . The lower plate portion 51 is formed in a substantially rectangular shape in plan view, and is inclined obliquely upward from the front side to the rear side. A rear end portion of the lower plate portion 51 is provided with a lower engagement portion 511 that is bent upward at a substantially right angle. A front end portion of the lower plate portion 51 is provided with a mounting piece 512 that extends substantially horizontally toward the front and has a generally inverted L shape in a side view, the tip side of which is bent downward at a substantially right angle. Three support portions 513 (only one is shown in FIG. 2) are provided in the front region of the lower plate portion 51 at intervals in the left-right direction. The support portion 513 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 513 . Thereby, the support portion 513 supports the upper plate portion 52 .

The upper plate portion 52 is supported on the upper side of the lower plate portion 51 and has a generally rectangular shape in plan view. An upper engaging portion 521 that bends downward is provided at the rear end portion of the upper plate portion 52 . The upper engaging portion 521 engages with the lower engaging portion 511 of the lower plate portion 51 . 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 in a plan view, and is inclined upward from the upper end portion of the upper engaging portion 521 toward the front side. The horizontal portion 62 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 .

The rear sloped portion 63 slopes obliquely downward at a steep angle from the front end 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. The front sloped portion 64 slopes from the front end portion of the rear sloped portion 63 at a looser angle than the rear sloped portion 63 and protrudes forward from the opening 400 of the exhaust casing 40 . The lower engaging portion 511 of the lower plate portion 51 , the upper engaging portion 521 of the upper plate portion 52 , and the inclined portion 61 form a substantially U-shaped folded portion at the rear end portion of the current plate 50 .

Due to the rectifying plate 50 having the above shape, in the exhaust casing 40 , after moving backward along the slope of the lower plate portion 51 below the rectifying plate 50 , the 2, the exhaust passage is formed, which turns upward and makes a U-turn forward, moves forward above the upper plate portion 52, and reaches the opening 400 (see the flow of the combustion exhaust indicated by the chain double-dashed line in FIG. 2).

The rain cover 80 is fixed to the upper surface of the front inclined portion 64 . The rain shield part 80 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 that hits the rain shield 80 and rebounds rearward collides with the lower surface of the gently sloping portion 44 of the exhaust casing 40 . Rainwater hitting the lower surface of the gently sloping portion 44 drops onto the front side sloping portion 64 of the current plate 50 . 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 rain shield part 80 includes a receiving plate 81 , a right support part 82 and a left support part 83 . The receiving plate 81 is formed in a substantially rectangular shape extending in the horizontal direction in a plan view, and receives rainwater entering the exhaust casing 40 via the exhaust pipe 9 . The right support portion 82 hangs down from the right end portion of the receiving plate 81 and is formed in a substantially L shape when viewed from the front, with the lower end side folded back to the right. The left support portion 83 hangs down from the left end portion of the receiving plate 81 and is formed in a substantially inverted L shape in a front view in which the lower end side is folded leftward. The lower end sides of the right support portion 82 and the left support portion 83 are fixed (for example, by spot welding or the like) to the upper surface of the front inclined portion 64 . As a result, the receiving plate 81 is supported parallel to the upper surface of the front inclined portion 64 at a predetermined height position (height H described later) from the upper surface of the front inclined portion 64 . The fixed position of the rain cover 80 and the height H of the receiving plate 81 will be described later.

The structure of the exhaust pipe 9 will be described with reference to FIG. The exhaust pipe 9 is formed in a substantially square tubular shape extending in the front-rear direction. A front end portion of the exhaust pipe 9 is provided with a burring portion 91 bent inward. An exhaust outlet 92 is provided inside the burring portion 91 . The exhaust outlet 92 is formed in a substantially rectangular shape elongated in the left-right direction when viewed from the front. 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 when viewed from the front. An inwardly folded crimping piece 94 is provided on the outer peripheral portion of the flange portion 93 .

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 the lower plate portion 51 of the straightening plate 50 are arranged with respect to the rear surface of the flange portion 93, and a crimping piece It is crimped at 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 front end of the lower plate portion 51 of the current plate 50 extends to near the lower edge of the exhaust outlet 92 of the exhaust pipe 9 through the opening 400 of the exhaust casing 40 .

The exhaust pipe 9 having the structure described above is inserted from the rear side into a pipe fixing hole (not shown) provided in the upper portion of the front cover 8 and fixed to the rear surface of the front cover 8 . As a result, the exhaust pipe 9 is fixed in the upper portion of the front cover 8 so as to protrude forward.

The fixing position and height position of the rain cover 80 will be described with reference to FIGS. 4 to 6. FIG. For convenience of explanation, the rain cover 80 is omitted in FIGS. 4 and 5 . A1 to A5 indicated by two-dot chain lines in FIGS. 4 and 5 indicate paths of rainwater when the angle of incidence of the current plate 50 with respect to the upper surface of the upper plate portion 52 is changed from large to small. 4 shows the paths of rainwater A1 and A2, and FIG. 5 shows the paths of rainwater A3 to A5. Rainwater falls vertically when there is no wind, but the falling angle changes due to the influence of wind (air flow) and the like. Depending on the falling angle, rainwater may fall into the exhaust casing 40 from the exhaust outlet 92 of the exhaust stack 9 . When rainwater falls into the exhaust casing 40, it hits the upper surface of the upper plate portion 52 (the front inclined portion 64 or the rear inclined portion 63) of the current plate 50 and rebounds backward. The direction in which the rainwater rebounds changes depending on the incident angle of the rainwater with respect to the upper surface of the front inclined portion 64 .

As shown in FIG. 4, the rainwater A1 and A2 has a relatively large incident angle, so that it strikes the front side of the upper surface of the front inclined portion 64 of the current plate 50 and rebounds obliquely upward, and then hits the lower surface of the gently inclined portion 44 of the exhaust casing 40. collide with The rainwater that collides with the lower surface of the gently sloping portion 44 either flows along the gently sloping portion 44 toward the exhaust outlet 92 side, or drops onto the upper surface of the front side sloping portion 64 and flows toward the exhaust outlet 92 side. Therefore, even if the rainwater A1 and A2 hits the upper surface of the front inclined portion 64 and rebounds, it does not enter the exhaust casing 40 on the back side.

However, as shown in FIG. 5, the rainwater A3 and A4 are incident on the exhaust outlet 92 at a shallow angle, which is smaller than the incident angle of the rainwater A1 and A2. It hits the rear end side rather than the center of the. The rainwater A3 hits the center of the upper surface of the front sloped portion 64 and rebounds obliquely upward, and then hits the lower surface of the top portion 42 without colliding with the gently sloped portion 44 . Some of the rainwater that has collided with the lower surface of the top portion 42 may run backward along the top portion 42 and the curved portion 41 or drop onto the top surface of the horizontal portion 62 of the current plate 50 . Some of the rainwater that has fallen on the upper surface of the horizontal portion 62 may flow backward along the inclined portion 61 .

The rainwater A4 has a smaller incident angle than the rainwater A3. Therefore, after hitting the rear side of the upper surface of the front side inclined portion 64 and rebounding obliquely upward, it passes over the corner C where the horizontal portion 62 and the inclined portion 61 of the rectifying plate 50 connect, and the lower surface of the uppermost portion 42 . Collision in the rear. Rainwater that has collided with the lower surface of the top portion 42 may run backward along the top portion 42 and the curved portion 41 or drop onto the upper surface of the inclined portion 61 of the straightening plate 50 . Rainwater falling on the upper surface of the inclined portion 61 may flow backward as it is.

The rainwater A5 is rainwater that blows into the exhaust outlet 92 substantially horizontally, and is assumed in the case of a storm such as a typhoon or a tornado, for example. Rainwater A5 has a smaller incident angle than rainwater A4. Therefore, the rainwater A5 passes above the front inclined portion 64 of the current plate 50 and hits the upper surface of the rear inclined portion 63 . Since the rear inclined portion 63 is inclined at a steeper angle than the front inclined portion 64, rainwater A5 hitting the rear inclined portion 63 rebounds upward and collides with the lower surface of the steeply inclined portion 43 of the exhaust casing 40. - 特許庁The rainwater that collides with the lower surface of the steeply inclined portion 43 either flows along the steeply inclined portion 43 and the gently inclined portion 44 to the side of the exhaust outlet 92, or falls on the upper surface of the rear side inclined portion 63 and flows to the side of the exhaust outlet 92. . Therefore, the rainwater A5 does not enter the inner side of the exhaust casing 40, like the rainwater A1 and A2.

The rainwater A1 to A4 are examples of rainwater that passes through the vicinity of the upper edge of the exhaust outlet 92 and enters the upper surface of the upper plate portion 52 of the current plate 50 . On the other hand, in the case of rainwater passing below the upper edge of the exhaust outlet 92 and incident on the upper surface of the upper plate portion 52 at the same angle as the rainwater A1 to A4, the path is the path of the rainwater A1 to A4. is translated downward. Therefore, the incident position of the rainwater on the upper surface of the upper plate portion 52 is located in front of the incident position of the rainwater passing through the vicinity of the upper edge portion. Therefore, the position where the ball collides with the exhaust casing 40 after hitting the upper surface of the upper plate portion 52 and rebounding is also located on the front side. In other words, if rainwater impinging on the exhaust casing 40 by passing near the upper edge portion collides with the gently sloping portion 44 , rainwater passing below the upper edge portion will also strike the gently sloping portion 44 . collide with Therefore, in the present embodiment, the position at which the rainwater collides with the exhaust casing 40 after hitting the upper surface of the upper plate portion 52 and rebounding on the path of the rainwater passing near the upper edge portion of the exhaust outlet 92 is confirmed.

In this way, among the rainwater A1 to A5, the rainwater A3 and A4, which have a small incident angle, hit the upper surface of the front inclined portion 64 of the current plate 50 and rebound, and then reach both the gently inclined portion 44 and the steeply inclined portion 43. Since they do not collide, they may enter the inner side of the exhaust casing 40 and flow down inside the housing 2 . In order for the rainwater A3 and A4 with small incident angles to impinge on the upper surface of the front sloping portion 64, rebound, and then collide with the gently sloping portion 44 or the steep sloping portion 43 of the exhaust casing 40, It is sufficient to move the incident position of the incident rainwater forward and move the collision position of the rainwater colliding with the exhaust casing 40 forward. Therefore, in this embodiment, as shown in FIG. 2, a rain cover 80 is fixed to the upper surface of the front inclined portion 64 of the current plate 50, and rainwater is received at a position higher than the incident position of the upper surface of the front inclined portion 64. . As a result, the collision position with respect to the exhaust casing 40 can be moved forward.

As described above, the rainwater A4 hits the rear side of the upper surface of the front inclined portion 64 and rebounds obliquely upward. When the incident angle of rainwater is smaller than A4, the rainwater bounced off the upper surface of the front inclined portion 64 collides with the upper surface of the rear inclined portion 63 of the straightening plate 50 . Since the rear sloped portion 63 slopes at a steeper angle than the front sloped portion 64, rainwater that collides with the rear sloped portion 63 either flows forward along the rear sloped portion 63 or rebounds upward before , and flows forward against the lower surface of the steeply inclined portion 43 of the exhaust casing 40, so that it does not enter the inner side of the exhaust casing 40. - 特許庁

On the other hand, if the incident angle of rainwater is made larger than A4, the incident position with respect to the upper surface of the front inclined portion 64 moves forward like rainwater A3, A2 and A1 (see FIGS. 4 and 5). The rainwater A3 hits the upper surface of the front inclined portion 64 and rebounds, and then collides with the lower surface of the uppermost portion 42 of the exhaust casing 40, while the rainwater A2 collides with the lower surface of the gently inclined portion 44. - 特許庁For this reason, on the upper surface of the front inclined portion 64, for example, in the range from the incident position of the rainwater A2 to at least the incident position of the rainwater A4, if the rainwater is repelled at a position higher than the upper surface of the front inclined portion 64, the exhaust casing 40 can collide with the lower surface of the gently sloping portion 44 .

Therefore, as shown in FIG. 6, in the present embodiment, a virtual line extending from the upper edge of the exhaust outlet 92 of the exhaust pipe 9 to the upper surface of the upper plate portion 52 of the rectifying plate 50 is drawn through the exhaust outlet 92 to the outside. A virtual incident line P on which rain is incident from the top plate portion 52 is assumed to be a virtual incident line P, and a virtual intersection point between the virtual incident line P and the upper surface of the front inclined portion 64 of the upper plate portion 52 is assumed to be a reflection point Q1. A virtual line of reflection at an angle is assumed to be a virtual reflection line R1 on which rain reflects. Then, when the incident angle of the virtual incident line P is changed from large to small, the virtual intersection Q1 on the upper plate portion 52 when the virtual reflected line R1 first contacts the corner C of the upper plate portion 52 is Let Q1 be the reference point. The corner portion C corresponds to the vertex of the horizontal portion 62 and the rear inclined portion 63 . The path formed by the virtual incident line P and the virtual reflection line R1 at this time matches the path of the rainwater A4.

Then, on the upper surface of the front inclined portion 64 of the current plate 50, the rain cover 80 is fixed so as to cover at least the upper side of the reference point Q1. The receiving plate 81 is supported so as to be parallel to the upper surface of the front inclined portion 64 . With this configuration, a virtual incident line P that enters from the outside through the exhaust outlet 92 is reflected at the virtual intersection Q2 on the receiving plate 81 . That is, the rainwater A4 is reflected at a position closer to the exhaust outlet 92 and above the upper plate portion 52 than when the rain cover portion 80 is not provided. A virtual line reflected at the same angle as the virtual incident line P at the reflection point Q2 is a virtual reflection line R2. As the reflection point moves from Q1 to Q2, the imaginary reflection line also moves in parallel from R1 to R2. The virtual reflected line R2 collides with the lower surface of the gently sloping portion 44 of the exhaust casing 40 . In other words, the rainwater A4 is reflected at the reflection point Q2 on the receiving plate 81 of the rain shield 80, and flies along the route of the virtual reflection line R2, thereby colliding with the lower surface of the gently sloping portion 44 of the exhaust casing 40.

Further, the receiving plate 81 of the rain shield 80 also covers the upper surface of the front inclined portion 64 above the incident position (see FIG. 5) of the rainwater A3, so that the rainwater A4 hits the upper surface of the receiving plate 81 and rebounds. The rainwater A3 thus collected collides with the lower surface of the gently sloping portion 44 of the exhaust casing 40 . As a result, even if rainwater A3 and A4 is incident at a shallow angle through the exhaust outlet 92 of the exhaust pipe 9, the rainwater A3 and A4 passes through the rear portion of the rectifying plate 50 and flows through the exhaust section 30. 2 can be prevented from entering.

Regarding the area covered by the receiving plate 81 on the upper surface of the front inclined portion 64, the rainwater that hits the upper surface of the front inclined portion 64 and rebounds, and then collides with the uppermost portion 42 of the exhaust casing 40, including the reference point Q1. It is preferable to cover at least the incident position with respect to the upper surface of the front inclined portion 64 . As a result, the rainwater rebounding from the upper surface of the front inclined portion 64 can reliably collide with the gently inclined portion 44 .

Further, as described above, the reference point Q1 is set on the front inclined portion 64 of the upper plate portion 52 , so the rain cover 80 is fixed to the front inclined portion 64 . As a result, the combustion exhaust that is folded back forward at the rear portion of the upper plate portion 52 reaches the rain shield portion 80 on the front inclined portion 64 after flowing over the rear inclined portion 63 . That is, the run-up distance for the combustion exhaust gas to move to the rain cover 80 can be lengthened. Therefore, the rain shield part 80 can be prevented from obstructing the flow of the combustion exhaust gas, so that the exhaust part 30 can smoothly discharge the combustion exhaust gas from the exhaust outlet 92 .

Also, the height H of the receiving plate 81 of the rain shield 80 is preferably set so that the virtual reflection line R2 reliably collides with the lower surface of the gently sloping portion 44 of the exhaust casing 40 . The height H is the height from the upper surface of the front inclined portion 64 . If the height H is too low, there is a possibility that the upper surface of the front inclined portion 64 and the lower surface of the gently inclined portion 44 will not collide with each other. By defining the height H at which rainwater can collide with the lower surface of the gently sloping portion 44, the rainwater A4 reflected at the reflection point Q2 on the receiving plate 81 can reliably collide with the lower surface of the gently sloping portion 44.

Further, in the rain shield part 80, the receiving plate 81 is located below the intermediate part in the height direction between the upper surface of the front inclined part 64 and the lower surface of the gently inclined part 44 of the exhaust casing 40 facing the upper surface. It is better to set As a result, it is possible to prevent the flow of the combustion exhaust passing above the upper plate portion 52 from being obstructed, so that the combustion exhaust can be smoothly discharged from the exhaust outlet 92 .

Note that, as described above, rainwater, such as rainwater A5, which enters the exhaust outlet 92 at a shallower angle and does not hit the rain cover 80, collides with the rear inclined portion 63 of the straightening plate 50. Such rainwater does not enter the housing 2 either.

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 that heats the flowing water with the heat of the combustion exhaust from the burner 181. An opening 400 is provided at the front to discharge the burned exhaust gas. The exhaust pipe 9 protrudes forward from the opening 400 and discharges the combustion exhaust discharged from the opening 400 to the outside from an exhaust outlet 92 formed at the front end. The rectifying plate 50 is supported in the exhaust casing 40 , receives the combustion exhaust that has passed through the heat exchanger 19 upward, and rectifies it 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 inclined obliquely upward from the front side to the rear side. The upper plate portion 52 is bent forward and folded back from the rear portion of the lower plate portion 51 , and then slopes downward toward the front side and extends toward the lower edge portion of the exhaust outlet 92 .

In the above configuration, the rain shield part 80 is fixed to the upper surface of the upper plate part 52 . As a result, even if rainwater enters the exhaust casing 40 at a shallow angle through the exhaust outlet 92 of the exhaust pipe 9, the rainwater is directed to the exhaust outlet 92 side and the upper plate 40 more than the case where the rain cover 80 is not provided. Reflected at a position above the portion 52 . Therefore, since rainwater collides with the upper portion of the exhaust casing 40 , it is possible to prevent the rainwater from entering the housing 2 beyond the rear portion of the current plate 50 .

A virtual line extending from the exhaust outlet 92 of the exhaust pipe 9 to the upper surface of the upper plate portion 52 is assumed to be a virtual incident line P on which rainwater enters from the outside through the exhaust outlet 92, and the virtual incident line P and the upper plate portion When the virtual line that reflects at the same angle as the virtual incident line P at the virtual intersection with the upper surface of 52 is assumed to be a virtual reflection line R1 on which rainwater is reflected, and the incident angle of the virtual incident line P is changed from large to small. In addition, when the imaginary intersection point of the upper plate portion 52 when the virtual reflection line R1 first contacts the upper surface of the upper plate portion 52 is set as a reference point Q1, the rain cover 80 covers at least the upper side of the reference point Q1. It should be provided as

In the above description, the curved portion 41 and the uppermost portion 42 of the exhaust casing 40 are examples of the "rear curved portion" of the present invention, and the steeply inclined portion 43 and the gently inclined portion 44 are examples of the "slanted portion" of the present invention. is. The rear inclined portion 63 of the upper plate portion 52 of the current plate 50 is an example of the "first inclined portion" of the present invention, and the front inclined portion 64 is an example of the "second inclined portion" of the present invention.

The present invention is not limited to the above embodiments, and various modifications are possible. The exhaust casing 40 of the present embodiment includes a steep slope portion 43 and a gentle slope portion 44 having different slope angles, and slopes in two stages, but may have a single slope.

The straightening plate 50 is composed of two members, a lower plate portion 51 and an upper plate portion 52, but may be formed by bending a single sheet metal. The upper plate portion 52 is provided with a rear inclined portion 63 and a front inclined portion 64 having different inclination angles, so that the upper plate portion 52 is inclined in two stages. good too. Also, the inclined portion may be curved, for example, instead of linearly inclined. Further, the support structure of the current plate 50 in the exhaust casing 40 is not limited to the above embodiment.

The rain shield part 80 has a structure in which the receiving plate 81 is supported by the right support part 82 and the left support part 83, but may have a structure other than this. The receiving plate may be directly fixed onto the upper plate portion 52 of the straightening plate 50 .

The rain cover 80 receives rainwater that has entered through the exhaust outlet 92 and collides with the gently sloping portion 44 of the exhaust casing 40. good too.

In the exhaust part 30 of the above-described embodiment, the rainwater incident toward the upper surface of the upper plate part 52 of the rectifying plate 50 is received by the receiving plate 81 of the rain shield part 80, thereby causing the lower surface of the gently inclined part 44 of the exhaust casing 40 to fall. However, it is sufficient if the rainwater bounced off the upper surface of the upper plate portion 52 of the current plate 50 does not collide with the rear end side of the uppermost portion 42 of the exhaust casing 40 . . Therefore, the effect of the present application can be obtained even if the front end side of the uppermost portion 42 of the exhaust casing 40 is received by the receiving plate 81 of the rain cover 80 .

The burring portion 91 provided at the front end portion of the exhaust pipe 9 may be omitted.

1 Water heater 9 Exhaust pipe 19 Heat exchanger 40 Exhaust casing 41 Curved part 42 Top part 43 Steeply inclined part 44 Gently inclined part 50 Straightening plate 51 Lower plate part 52 Upper plate part 63 Rear side inclined part 64 Front side inclined part 80 Rain shield Part 92 exhaust outlet 181 burner 400 opening P1 virtual incident line Q1 reference point R1 virtual reflected line

Claims (5)

It is provided above a heat exchanger that heats the water flow with the heat of the combustion exhaust from the burner, the front portion projects forward from the heat exchanger, and the combustion exhaust that has passed upward through the heat exchanger is discharged. an exhaust casing with an opening in the front;
an exhaust pipe that protrudes forward from the opening and discharges the combustion exhaust discharged from the opening to the outside from an exhaust outlet formed at a front end thereof;
A water heater comprising a rectifying plate that is supported in the exhaust casing and receives the combustion exhaust that has passed upward through the heat exchanger and rectifies it toward the opening,
The current plate is
a lower plate portion that inclines obliquely upward from the front side to the rear side;
an upper plate portion that is bent forward from the rear portion of the lower plate portion and folded back, then inclined downward toward the front side, and extends toward the lower edge portion of the exhaust outlet;
The upper surface of the upper plate portion is provided with a rain protection portion above the upper surface that receives rainwater entering from the outside through the exhaust outlet ,
The rain protection part is
a receiving plate having a substantially rectangular shape in a plan view;
a pair of left and right support portions hanging down from both left and right end portions of the receiving plate and supporting the receiving plate at a position above the upper surface by fixing lower end portions thereof to the upper surface;
with
A water heater according to claim 1, wherein a passage is formed below said receiving plate for allowing part of said combustion exhaust flowing in said exhaust casing to pass toward said opening. A virtual line extending from the exhaust outlet of the exhaust pipe to the upper surface of the upper plate portion is assumed to be a virtual incident line on which the rainwater enters from the outside through the exhaust outlet, and the virtual incident line and the above-described A virtual line that reflects at the same angle as the virtual incident line at the virtual intersection with the upper surface is defined as a virtual reflection line that reflects the rainwater, and when the incident angle of the virtual incident line is changed from a large one to a small one, When the imaginary reflection line is the upper surface of the upper plate portion and the imaginary intersection point on the upper plate portion when first contacting the portion other than the imaginary intersection point is set as a reference point,
2. The water heater according to claim 1, wherein said rain shield is provided so as to cover at least an upper part of said reference point. The exhaust casing is
a rear curved portion that rises upward at the rear portion and extends curved forward;
a sloped portion that slopes downward from the front portion of the rear curved portion toward the exhaust outlet;
3. The rain shield part is provided at a height position where the rainwater incident on the upper surface of the rain shield part and reflected collides with the lower surface of the inclined part of the exhaust casing. water heater. The upper plate portion
a first inclined portion that is steeper and downwardly inclined forward than the lower plate portion;
a second inclined portion inclined downward from the front end portion of the first inclined portion at a gentler gradient than the first inclined portion and extending toward the lower edge portion of the opening;
The water heater according to any one of claims 1 to 3, wherein the rain shield is provided on the second inclined portion. The rain protection part is
5. The hot water supply system according to any one of claims 1 to 4, wherein the hot water supply is provided below an intermediate portion in the height direction between the upper surface of the upper plate portion and the lower surface of the exhaust casing facing the upper surface. vessel.

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