JP2023034371A - Burner and water heater - Google Patents

Abstract

To provide a burner which can prevent a positional displacement of a burner unit.SOLUTION: A water heater comprises a burner 3 in a box body. The burner 3 comprises a unit group 23, an inner case 20, a support plate 22, a lower plate part 24 and a front plate part 25. Since the front plate part 25 and the lower plate part 24 are different bodies, the unit group 23 can be set between a right plate part 42 and a left plate part 43 in a state that the support plate 22 and the lower plate part 24 are fixed to the inside of the inner case 20. In a state that a plurality of burner units 51 are arranged at an upper face of the lower plate part 24, rear parts of the burner units can be supported to a back plate part, and a positional displacement of the burner units 51 in the inner case 20 can be thereby prevented. After that, a worker screw-fixes the front plate part 25 to a pair of left and right inner bent pieces 47, 48 of the support plate 22, and a pair of left and right upper bent pieces 66, 67 of the lower plate part 24 from the front.SELECTED DRAWING: Figure 3

Description

The present invention relates to a combustion device and a water heater.

A combustion device for a water heater disclosed in Patent Document 1 includes an inner case. A support plate, an inner plate, and a plurality of burner units are housed inside the inner case. The support plate has a pair of left and right horizontal plate portions and a back plate portion, and the pair of left and right horizontal plate portions are fixed so as to be positioned on the inner surfaces of the left and right side wall portions of the inner case. The inner plate is formed in an L-shape in side view, in which the lower plate portion and the front plate portion are integrated, and the lower plate portion is assembled so as to be close to the lower sides of the lower ends of the pair of left and right horizontal plate portions. . A plurality of burner units are arranged in a space surrounded by a front plate portion, a pair of left and right horizontal plate portions, and a back plate portion. The plurality of burner units are flat-shaped rich and thin burners, and are arranged so that their thickness direction is the left-right direction. The rear portion of the burner unit is locked by the back plate portion, the front portion is locked by the front plate portion, and the bottom portion is supported from below by the lower plate portion.

Japanese Patent Application Laid-Open No. 2020-67220

In the combustion apparatus described in Patent Document 1, the lower plate portion and the front plate portion, which are the inner plates, are integrated. It is necessary to assemble the inner plate after engaging the plate portion. Since the rear portion of each of the plurality of burner units is engaged with the back plate portion without the lower plate portion, it is difficult to stably perform the work. As a result, there is a possibility that the position of the burner unit will be displaced within the inner case.

SUMMARY OF THE INVENTION An object of the present invention is to provide a combustion apparatus and a water heater that can prevent a positional deviation of a burner unit.

A combustion apparatus according to claim 1 comprises a unit group in which a plurality of burner units are arranged in a horizontal direction, a rear wall portion, a pair of left and right side wall portions extending forward from both left and right ends of the rear wall portion, and the rear wall portion. an inner case for housing the unit group therein; and a pair of left and right side plate portions disposed on the inner surface sides of the pair of left and right side wall portions, and between the inner case and the unit group a lower plate portion disposed in close proximity to the lower ends of the pair of left and right horizontal plate portions to support the unit group from below; and the pair of left and right horizontal plates. and a front plate portion fixed to the front end portion of the lower plate portion and arranged on the front side of the unit group. A pair of left and right inward bending pieces that bend inward are provided, and a pair of left and right upward bending pieces that bend upward are provided on both left and right sides of the front end portion of the lower plate portion, and the inner A first fixing hole penetrating in the front-rear direction is provided in each of the bending piece and the upper bending piece, and a second fixing hole penetrating in the front-rear direction is provided in a portion of the front plate portion corresponding to the first fixing hole. Holes are provided, and the front plate portion is in contact with the front surfaces of the pair of left and right inward bending pieces and the pair of left and right upward bending pieces from the front so as to hold the first fixing hole and the second fixing hole. A screw is fastened to the hole from the front to fix the pair of left and right inward bending pieces and the pair of left and right upward bending pieces.

A protruding plate portion may be provided at a lower portion of the front end portion of each of the pair of left and right horizontal plate portions in the combustion apparatus according to claim 2, the protruding plate portion protruding further forward than the inwardly bent piece and the upwardly bent piece.

A portion of the outer edge portion of the upper bent piece of the combustion apparatus according to claim 3, which is located outside the lower plate portion in the left-right direction, is formed so that the height decreases toward the outer side, and the protruding plate portion A lower end portion of the may be provided with an inclined portion that is inclined so that the height position decreases from the front side to the rear side.

A gap corresponding to the thickness of the projecting plate portion may be formed between the upper bent piece and the inner case.

A water heater according to claim 5 is characterized by comprising the combustion device according to any one of claims 1 to 4.

According to the combustion apparatus of claim 1, since the front plate portion and the lower plate portion are separate members, the plurality of burner units are arranged on the upper surface of the lower plate portion while the support plate and the lower plate portion are arranged inside the inner case. are sequentially arranged, and the respective rear portions can be supported by the back plate portion. This allows the assembly worker to reliably place the plurality of burner units at the determined positions. Therefore, the combustion device can prevent positional deviation of the plurality of burner units within the inner case. After that, the worker moves forward with respect to a pair of left and right inward bending pieces provided at the front ends of the pair of left and right horizontal plate portions and a pair of left and right upward bending pieces provided at the front end portions of the lower plate portion. The plate portion is brought into contact from the front and fixed with screws. The front end portions of the pair of left and right lateral plate portions and the front end portion of the lower plate portion are fixed to the front plate portion. Thereby, the combustion device can prevent the mutual positional relationship between the horizontal plate portion and the lower plate portion from being deviated.

According to the combustion apparatus of claim 2, if an operator tries to assemble the lower plate from the front while the horizontal plate is curved inward, the rear surface of the upper bending piece interferes with the tip of the projecting plate. Therefore, the lower plate portion stops at a position where it protrudes further forward than the inwardly bent piece. As a result, the worker can notice that the lateral plate portion is curved inward, thereby preventing the product from being supplied in an erroneously assembled state.

According to the combustion apparatus of claim 3, even if the horizontal plate portion curves inward and the protruding plate portion interferes with the upper bent piece, the lower plate portion is further pushed forward so that the protruding plate portion The inclined portion formed at the lower end of the contact the outer edge of the upper bending piece. Then, the inclined portion slides down along the outer edge portion of the upwardly bent piece, so that the projecting plate portion is spread outward. As a result, the combustion device can guide the projecting plate portion to the outside and guide it to a normal position. Therefore, the combustion device can improve work efficiency when fixing the lower plate portion in the inner case.

According to the combustion apparatus of claim 4, even when the horizontal plate portion is curved inward, the projecting plate portion can be supported from the inside in the left-right direction by the outer edge portion of the upward bending piece.

According to the water heater of claim 5, since the combustion device according to any one of claims 1 to 4 is provided, it is possible to obtain the effect described in any one of claims 1 to 4.

1 is a front view of water heater 1. FIG. 3 is a perspective view of a combustion device 3; FIG. 3 is an exploded perspective view of the combustion device 3; FIG. 4 is a perspective view before fixing the lower plate portion 24 inside the case main body 21. FIG. 4 is a plan view before fixing the lower plate portion 24 inside the case main body 21. FIG. 3 is a perspective view of a state in which a lower plate portion 24 is fixed inside a case body 21; FIG. 3 is a plan view of a state in which a lower plate portion 24 is fixed inside a case body 21; FIG. FIG. 7 is a perspective view (with the right wall portion of the case main body 21 cut away) showing a state in which the unit group 23 is installed in the case main body 21 shown in FIG. 6 ; FIG. 9 is a perspective view (the right wall portion of the case body 21 is cut away) showing a state in which the front plate portion 25 is fixed to the front side of the case body 21 shown in FIG. 8 ; 4 is a plan view of the support plate 22 with the left plate portion 43 curved inward, before the lower plate portion 24 is fixed in the case main body 21. FIG. 4 is a plan view showing a state in which an upper bending piece 67 interferes with the tip of the projecting plate portion 50. FIG. 12 is a partially enlarged view of the periphery of the projecting plate portion 50 shown in FIG. 11; FIG. 13 is a partially enlarged view showing a state in which the lower plate portion 24 is further pushed inward from the state shown in FIG. 12; FIG.

Embodiments of the present invention will be described below. Unless there is a specific description, the device configurations and the like described below are merely illustrative examples and not intended to limit the scope of the present invention. The drawings are used to explain technical features that can be employed by the present invention.

The configuration of the water heater 1 will be described with reference to FIG. A water heater 1 has a combustion device 3, a heat exchanger 4, and an exhaust hood 5 arranged in order from below in a rectangular box-shaped housing 2. As shown in FIG. A gas supply unit 6 is attached to the front surface of the combustion device 3 . The gas supply unit 6 distributes and supplies the gas to a unit group 23 (see FIG. 2) in the combustion apparatus 3, which will be described later. A fan 7 is attached to the lower surface of the combustion device 3 . A fan 7 supplies combustion air to the combustion device 3 .

On the front side of the fan 7 and below the combustion device 3 , a controller 8 containing an electrical board is erected laterally on the inner bottom surface of the housing 2 . The heat exchanger 4 is provided with a plurality of fins (not shown) at predetermined intervals in the left-right direction inside the casing, and is provided with heat transfer tubes 9 that pass through each fin in a meandering manner. Heat exchange is performed between the exhaust gas and the water flowing through the heat transfer pipes 9 . The exhaust hood 5 has a laterally oblong exhaust pipe 10 on its front surface. The exhaust pipe 10 protrudes forward through a front cover (not shown) and discharges combustion exhaust that has passed through the heat exchanger 4 to the outside.

A gas inlet 11 , a water inlet 12 , and a hot water outlet 13 are provided on the bottom surface of the housing 2 . An external gas pipe (not shown) is connected to the gas inlet 11 . A water pipe (not shown) is connected to the water inlet 12 . A pipe (not shown) to a hot water tap is connected to the hot water outlet 13 . The gas inlet 11 is connected within the housing 2 to the gas supply unit 6 via a gas pipe 14 having a main valve, a proportional valve, or the like. The water inlet 12 is connected to the upstream end of the heat transfer tube 9 of the heat exchanger 4 via a water supply tube 15 . The hot water outlet 13 is connected to the downstream end of the heat transfer tube 9 via the hot water outlet pipe 16 .

The structure of the combustion device 3 will be described with reference to FIGS. 2 and 3. FIG. The combustion device 3 includes an inner case 20 shaped like a square box. The inner case 20 is housed inside the housing 2 . A unit group 23 is assembled inside the inner case 20 . The unit group 23 includes a plurality of flat burner units 51 stacked in the left-right direction, and has a substantially rectangular parallelepiped shape. The inner case 20 includes a case body 21 and a front wall 26, and is made of metal (for example, aluminized steel plate). The case body 21 is open at the top and front. The front wall 26 is attached to the front surface of the case body 21 . The unit group 23 is supported inside the case body 21 by a support plate 22, a lower plate portion 24, and a front plate portion 25, which will be described later.

As shown in FIG. 3 , the case body 21 includes a right wall portion 31 , a left wall portion 32 , a rear wall portion 33 , a bottom wall portion 34 and an overheat prevention plate 38 . The upper end of the rear wall portion 33 and the upper ends of the right wall portion 31 and the left wall portion 32 are bent upward over the entire length. The raised portion 36 has a substantially L-shaped cross section. A plurality of crimping pieces 37 are provided on each rising portion 36 at predetermined intervals. Fixed pieces 311 and 321 are bent outward at the front ends of the right wall portion 31 and the left wall portion 32, respectively. The front wall 26 and the gas supply unit 6 (see FIG. 1) are screwed to the fixing pieces 311 and 321 . A rectangular opening 35 to which the fan 7 is connected is provided in the left rear portion of the bottom wall portion 34 .

The overheating prevention plate 38 is a horizontally long rectangular metal plate (for example, a stainless steel plate), and is attached to cover the upper portion of the inner surface of the rear wall portion 33 with a gap therebetween. A bulging portion 331 projects backward from the rear wall portion 33 below the overheating prevention plate 38 . The bulging portion 331 has a horizontally long rectangular shape extending in the left-right direction. A rail portion 312 protruding inward is provided on the lower side of the inner surface of the right wall portion 31 . A rail portion 322 that protrudes inward is also provided at the lower side of the inner surface of the left wall portion 32 and at the same height as the rail portion 312 . The rail portions 312 and 322 extend substantially horizontally in the front-rear direction.

The support plate 22 includes a back plate portion 40, a right plate portion 42, and a left plate portion 43, and is formed in a generally U-shape in plan view that opens forward. The support plate 22 is also made of metal. The back plate portion 40 has a horizontally long rectangular shape when viewed from the front, and is provided along the inner surface of the rear wall portion 33 . The right plate portion 42 and the left plate portion 43 are bent forward from the right end portion and the left end portion of the back plate portion 40 . A fitting portion 44 is provided on the back plate portion 40 so as to protrude rearward. The fitting portion 44 has the same shape as the bulging portion 41 and fits into the bulging portion 41 from the front. A plurality of support pieces 45 are bent forward at equal intervals in the left-right direction on the upper edge of the back plate portion 40 . The support piece 45 is provided with a slit 45A. The slit 45A extends downward. A plurality of support pieces 46 are also bent forward at equal intervals in the left-right direction at the lower edge of the back plate portion 40 .

The right plate portion 42 and the left plate portion 43 have a lateral width that accommodates the unit group 23 , and extend forward inside the right wall portion 31 and the left wall portion 32 . The right plate portion 42 includes a rear extension portion 421, a stepped portion 422, and a front extension portion 423 in order from the rear side to the front side. The rear extending portion 421 extends forward from the right end portion of the back plate portion 40 to substantially the central portion of the right plate portion 42 in the front-rear direction. The step portion 422 is bent rightward from the front end portion of the rear extension portion 421 and extends rightward. The front extending portion 423 is bent forward from the right end portion of the stepped portion 422 and extends forward. An inward bending piece 47 having a fixing hole 471 is bent inward at a portion of the front extending portion 423 excluding the lower portion of the front end portion.

A protruding plate portion 49 is provided at the lower portion of the front end portion of the front extending portion 423 so as to protrude further forward than the inwardly bent piece 47 . The upper end portion of the protruding plate portion 49 extends substantially horizontally in the front-rear direction, and the front end portion of the protruding plate portion 49 extends parallel to the vertical direction. An inclined portion 491 (see FIG. 8) is provided on the front end side of the lower end portion of the projecting plate portion 49 . The inclined portion 491 is lowered in height toward the rear from the front end and is inclined downward.

Similarly to the right plate portion 42, the left plate portion 43 also includes a rear extending portion 431, a stepped portion 432, and a front extending portion 433 in order from the rear side to the front side. The rear extending portion 431 extends forward from the left end portion of the back plate portion 40 to substantially the central portion of the left plate portion 43 in the front-rear direction. The stepped portion 432 is bent leftward from the front end portion of the rear extension portion 431 and extends leftward. The front extending portion 433 is bent forward from the left end portion of the stepped portion 432 and extends forward. An inward bending piece 48 having a fixing hole 481 is bent inward at a portion of the front extending portion 433 excluding the lower portion of the front end portion.

A protruding plate portion 50 is also provided at the lower portion of the front end portion of the front extending portion 433 so as to protrude further forward than the inwardly bent piece 48 . The projecting plate portion 50 has the same shape as the projecting plate portion 49 , and an inclined portion 501 is provided on the front end side of the lower end portion of the projecting plate portion 50 . The inclined portion 501 also decreases in height toward the rear from the front end and slopes downward.

Each burner unit 51 constituting the unit group 23 is a well-known dark and light burner. The burner unit 51 includes a light side inlet 53 , a rich side inlet 54 , a mixing section 55 and a flame hole section 56 . The lean side introduction port 53 is a lower opening that opens forward and into which fuel gas and primary air are introduced, and the rich side introduction port 54 is an upper opening. The mixing section 55 is provided on the downstream side of the light side inlet 53 and the rich side inlet 54, and the interior is separated for each inlet. The flame hole portion 56 opens at the upper end of the mixing portion 55 and consists of a central light flame hole and both left and right thick flame holes.

The lower plate portion 24 is also made of metal, and is formed in a substantially rectangular shape elongated in the horizontal direction in a plan view. A plurality of small holes 611 are formed in the lower plate portion 24 at predetermined intervals in the front, rear, left, and right directions. A screwing piece 61 is bent downward at the rear end of the lower plate portion 24 . Downward bending pieces 63 and 64 are formed at the right and left edges of the lower plate portion 24 . The lower bending pieces 63 and 64 have a substantially rectangular shape elongated in the front-rear direction when viewed from the side.

An upper bent piece 66 is bent upward at the right end of the front end of the lower plate portion 24 . An upper bent piece 67 is bent upward at the left end of the front end of the lower plate portion 24 . The upper bent piece 66 has a substantially semicircular shape when viewed from the front, and the right portion of the outer edge portion 662 forms an arcuate tapered portion whose height decreases toward the right (see FIG. 4). The upper bent piece 67 is also symmetrical with the upper bent piece 66 and has a substantially semicircular shape when viewed from the front, and the left portion of the outer edge portion 672 forms an arcuate tapered portion whose height decreases toward the left. (See Figure 4). Fixing holes 661 and 671 penetrating in the front-rear direction are provided in the upper bending pieces 66 and 67, respectively.

The front plate portion 25 is also made of metal, and is formed in a generally rectangular shape that is horizontally long when viewed from the front. The front plate portion 25 is fixed to the inwardly bent pieces 47 and 48 of the support plate 22 and the upwardly bent pieces 66 and 67 of the lower plate portion 24 . A plurality of support pieces 65 are bent rearward at equal intervals in the left-right direction on the upper edge of the front plate portion 25 .

Below the plurality of support pieces 65, a plurality of upper and lower pairs of light gas supply holes 6A and rich gas supply holes 6B are arranged in parallel in the left-right direction. The lower low gas supply hole 6A is an oblong burring hole. The upper rich gas supply hole 6B is a circular burring hole. Front bending pieces 68 and 69 are formed at the right and left ends of the front plate portion 25 so as to face forward. Fixing holes 621 and 623 are provided in the middle portion and the lower portion in the height direction of the right end portion of the front plate portion 25 . Fixing holes 622 and 624 are provided in the middle and lower portions of the left end of the front plate portion 25 in the height direction.

The front wall 26 has a substantially oblong rectangular shape when viewed from the front, and is made of metal. A raised portion 74 is provided on the upper edge of the front wall 26 . The raised portion 74 is bent upward over the entire length of the upper edge of the front wall 26 and has a substantially L-shaped cross section. A plurality of crimping pieces 75 are arranged side by side in the lateral direction on the raised portion 74 at predetermined intervals. A mounting hole 71, a mounting hole 72, and a through hole 73 are provided at predetermined intervals in order from the right side to the left side in the middle portion of the front wall 26 in the height direction. A discharge electrode (not shown) for ignition is attached to the attachment hole 71 . A frame rod (not shown) as a flame detection electrode is attached to the attachment hole 72 . A viewing window (not shown) is attached to the through hole 73 so as to face it.

An example of a method for assembling the combustion device 3 will be described with reference to FIGS. 3 to 9. FIG. As shown in FIGS. 3 and 4, the operator places the support plate 22 inside the case main body 21, and attaches the support plate 22 to the rear wall portion 33 at a position where the fitting portion 44 of the support plate 22 fits into the bulging portion 331. As shown in FIGS. Fix with rivets (not shown). At this time, the upper portion of the support plate 22 is overlapped with the lower portion of the overheating prevention plate 38 from the front, and the lower portion of the overheating prevention plate 38 is pressed against the rear wall portion 33 side and fixed. The right surface of the front extending portion 423 of the right plate portion 42 of the support plate 22 contacts the inner surface of the right wall portion 31 . The left surface of the front extending portion 433 of the left plate portion 43 contacts the inner surface of the left wall portion 32 .

Next, as shown in FIGS. 3 to 5, the operator places the lower plate portion 24 on the front side of the case main body 21, and bends the lower bent pieces 63 and 64 of the lower plate portion 24 to the rail portions 312 in the case main body 21. , 322 toward the back of the case body 21 . At this time, a predetermined gap P1 is formed between the upper bent piece 66 and the inner surface of the right wall portion 31 on the right side of the lower plate portion 24, as shown in FIG. A predetermined gap P2 is formed between the upper bent piece 67 and the inner surface of the left wall portion 32 on the left side of the lower plate portion 24 .

From this state, by moving the lower plate portion 24 to the inner side of the case main body 21, the projecting plate portion 49 on the right side of the support plate 22 is inserted into the gap P1 from behind, thereby supporting the gap P2. The projecting plate portion 50 on the left side of the plate 22 is inserted from behind (see FIGS. 6 and 7). At this time, the protruding plate portions 49 and 50 protrude further forward than the upper bent pieces 66 and 67 and the inward bent pieces 47 and 48 .

The gaps P1 and P2 are preferably designed to have widths corresponding to the respective thicknesses of the protruding plate portions 49 and 50, and more specifically, to be the same as the thickness of the protruding plate portions 49 and 50. In this case, the protruding plate portions 49 and 50 are inserted into the gaps P1 and P2 and sandwiched and locked between the upper bending pieces 66 and 67 and the right wall portion 31 and the left wall portion 32. . As a result, the projecting plate portions 49 and 50 are supported from the inside by the outer edge portions 662 and 672 of the upper bent pieces 66 and 67 .

A screwing piece 61 of the lower plate portion 24 contacts the front surface of the rear wall portion 33 . The operator screw-fastens the screw-fastening piece 61 to the front surface of the rear wall portion 33 with two left and right screws 81 and 82 from the front. Thereby, as shown in FIGS. 6 and 7 , the lower plate portion 24 is fixed inside the case body 21 and arranged directly below the support plate 22 . The lower bending pieces 63 and 64 are supported from below by the rail portion 312 of the right wall portion 31 and the rail portion 322 of the left wall portion 32 . The lower bending pieces 63 and 64 contact the inner surfaces of the right wall portion 31 and the left wall portion 32, respectively. In the front-rear direction of the case body 21, the right upper bent piece 66 of the lower plate portion 24 is arranged at the same position as the right inner bent piece 47 of the support plate 22, and the left upper bent piece 66 of the lower plate portion 24 is arranged at the same position. 67 is arranged at the same position as the left inward bending piece 48 of the support plate 22 .

Next, as shown in FIG. 8, the worker arranges the 12 burner units 51 on the upper surface of the lower plate portion 24 in order in the horizontal direction. A plurality of support pieces 45 and 46 provided on the back plate portion 40 of the support plate 22 are engaged between the burner units 51 . The worker can place the burner unit 51 on the upper surface of the lower plate portion 24 and support the rear portion thereof on the back plate portion 40, so that the burner unit 51 can be stably set.

Next, as shown in FIG. 9 , the operator arranges the front plate portion 25 so as to face the front side of the unit group 23 . A plurality of support pieces 65 provided on the upper end portion of the front plate portion 25 are engaged between the burner units 51 . Next, the fixing hole 621 on the right side of the front plate portion 25 is aligned with the position of the fixing hole 471 of the inwardly bent piece 47 on the right side of the support plate 22 and fixed with screws 83 from the front. Further, the fixing hole 623 on the right side of the front plate portion 25 is aligned with the fixing hole 661 of the upper bent piece 66 of the lower plate portion 24 and fixed with a screw 95 from the front.

Next, the left fixing hole 622 of the front plate portion 25 is aligned with the fixing hole 481 of the left inwardly bent piece 48 of the support plate 22 and fixed with a screw 84 from the front. Further, the fixing hole 624 on the left side of the front plate portion 25 is aligned with the position of the fixing hole 671 of the upper bent piece 67 of the lower plate portion 24 and fixed with a screw 96 from the front. As a result, the front plate portion 25 is fixed to the support plate 22 and the lower plate portion 24 , and the unit group 23 is sandwiched between the front plate portion 25 and the back plate portion 40 of the support plate 22 .

The front bent pieces 68 and 69 of the front plate portion 25 abut against the inner surfaces of the right wall portion 31 and the left wall portion 32, respectively. The light gas supply hole 6A of the front plate portion 25 faces the corresponding light side introduction port 53 of the burner unit 51. As shown in FIG. The rich gas supply hole 6B faces the corresponding rich side inlet 54 of the burner unit 51 . Thereby, the gas supply unit 6 can supply gas to each of the plurality of burner units 51 through the plurality of low gas supply holes 6A and the high concentration gas supply holes 6B.

Next, as shown in FIG. 2, the operator arranges the front wall 26 so as to cover the upper half of the front surface of the case body 21, and attaches the fixing piece 311 of the right wall portion 31 and the fixing piece 321 of the left wall portion 32 to each other. It is fixed with screws 87 , 91 , 88 and 92 to the front plate portion 25 with screws 89 and 90 . Thus, the combustion device 3 is completed.

10 to 13, the case where the lower plate portion 24 is fixed while the left plate portion 43 of the support plate 22 is curved inward will be described. As described above, the support plate 22 is made of metal and has a substantially U-shape that opens toward the front side in a plan view. and the left plate portion 43, or both of them may be curved inward.

For example, as shown in FIG. 10, it is assumed that the left plate portion 43 is slightly curved inward. In this case, the protruding plate portion 50 provided at the front end portion of the left plate portion 43 is positioned slightly to the right from the right surface of the left wall portion 32 . If the curvature of the left plate portion 43 is small, the operator often does not notice it. The operator slides the lower plate 24 along the rails 312 and 322 of the case main body 21 from the front to the back in order to fix the lower plate 24 without noticing the bending of the left plate 43 .

When the case main body 21 shown in FIG. 10 is viewed from the front, the protruding plate portion 50 does not face the gap P2, but faces the rear surface of the upward bent piece 67. As shown in FIG. In this state, the operator slides the lower plate portion 24 from the near side to the far side.

In this case, as shown in FIGS. 11 and 12, the protruding plate portion 50 interferes with the rear surface of the upward bent piece 67 without being inserted into the gap P2. The lower plate portion 24 stops at the position where the projecting plate portion 50 interferes with the rear surface of the upper bending piece 67 . The left side of the lower plate portion 24 protrudes greatly toward the front with respect to the normal position. The normal position means the position of the lower plate portion 24 when the lower plate portion 24 is normally fixed inside the case main body 21 . By confirming the position of the lower plate portion 24 , the operator can easily notice the incorrect assembly of the lower plate portion 24 .

In order to eliminate erroneous assembly of the lower plate portion 24, for example, the operator pulls back the lower plate portion 24 once and straightens the inwardly curved left plate portion 43 along the right surface of the left wall portion 32. In this state, the lower plate portion 24 is again slid to the back side. As a result, the protruding plate portion 50 can be inserted from behind into the gap P2, and the lower plate portion 24 can be fixed at a regular position within the case body 21. As shown in FIG. Therefore, the mutual positional relationship between each burner unit 51 of the unit group 23 and the plurality of small holes 611 of the lower plate portion 24 does not shift. Therefore, the combustion device can stably supply a predetermined amount of secondary air from the plurality of small holes 611 toward each burner unit 51 .

Further, the operator may further push the lower plate portion 24 inward from the state shown in FIG. 12 (see arrow F1 in FIG. 12). In this case, the inclined portion 501 of the projecting plate portion 50 contacts the left portion of the outer edge portion 672 of the upper bending piece 67 . Then, as shown in FIG. 13, by further pushing the lower plate portion 24 inward (see arrow F1 in FIG. 13), the upper bending piece 67 moves further inward (see arrow T1 in FIG. 13). , the inclined portion 501 of the projecting plate portion 50 slides down along the left portion of the outer edge portion 672 . Along with this, the protruding plate portion 50 is pushed leftward (see arrow T2 in FIG. 13), and as a result, is automatically arranged in the gap P2 between the upper bending piece 67 and the right surface of the left wall portion 32. be done. Therefore, the projecting plate portion 50 is stably supported from the inner side in the left-right direction by the outer edge portion 672 of the upper bent piece 67 .

In this manner, even when the left plate portion 43 of the support plate 22 is curved inward, the lower plate portion 24 can be slid inwardly of the case main body 21 and pushed into the case main body 21 to the left through the projecting plate portion 50 . The plate portion 43 is spread outward, and the lower plate portion 24 is guided to a regular position. That is, since there is no need to correct the position of the curved left plate portion 43 , the combustion device 3 can improve work efficiency when fixing the lower plate portion 24 inside the case body 21 . Although the present embodiment describes the case where the left plate portion 43 of the support plate 22 curves inward, the same applies to the case where the right plate portion 42 curves inward.

As described above, the water heater 1 of this embodiment includes the combustion device 3 . The combustion device 3 includes a unit group 23 , an inner case 20 , a support plate 22 , a lower plate portion 24 and a front plate portion 25 . The unit group 23 is formed by arranging a plurality of burner units 51 side by side in the horizontal direction. The inner case 20 includes a rear wall portion 33, a right wall portion 31, a left wall portion 32, and a bottom wall portion 34, and accommodates the unit group 23 inside. The right wall portion 31 and the left wall portion 32 extend forward from both left and right ends of the rear wall portion 33 . The bottom wall portion 34 is connected to the rear wall portion 33, the right wall portion 31, and the left wall portion 32 to close the bottom surface. The support plate 22 includes a back plate portion 40 , a right plate portion 42 and a left plate portion 43 , and is arranged between the inner case 20 and the unit group 23 . The lower plate portion 24 is arranged close to the lower end portions of the right plate portion 42 and the left plate portion 43, and supports the unit group 23 from below. The front plate portion 25 is fixed to the front end portion of each of the right plate portion 42 and the left plate portion 43 and arranged on the front side of the unit group 23 .

A pair of left and right inward bending pieces 47 and 48 are provided at the front ends of the right plate portion 42 and the left plate portion 43, respectively. The inwardly bent pieces 47 and 48 are bent inward in the left-right direction of the inner case 20 . A pair of left and right upper bent pieces 66 and 67 are provided on both left and right sides of the front end portion of the lower plate portion 24 . The upper bending pieces 66, 67 are bent upward. The inward bending pieces 47 and 48 are provided with fixing holes 471 and 481 penetrating in the front-rear direction. Fixing holes 661 and 671 are provided through the upper bending pieces 66 and 67 in the front-rear direction. Fixing holes 621 , 622 , 623 , 624 penetrating in the front-rear direction are provided in portions corresponding to the fixing holes 471 , 481 , 661 , 671 of the front plate portion 25 . The front plate portion 25 is in contact with the front surfaces of the inwardly bent pieces 47, 48 and the upwardly bent pieces 66, 67 from the front, and the fixing holes 471, 481, 661, 671, the fixing holes 621, 622, 623, 621, 622, 623, . Screws 83 , 84 , 95 , 96 are fastened to 624 from the front to fix to the inwardly bent pieces 47 , 48 and upwardly bent pieces 66 , 67 .

Since the front plate portion 25 and the lower plate portion 24 are separate members, the right plate portion 42 and the left plate portion 43 of the support plate 22 and the lower plate portion 24 are arranged inside the inner case 20. A unit group 23 can be set between the portion 42 and the left plate portion 43 . With the unit group 23 arranged on the upper surface of the lower plate part 24, the rear part of each of the plurality of burner units 51 can be supported by the back plate part, so the unit group 23 can be stably set. After that, a pair of left and right inward bending pieces 47 and 48 provided at the front ends of the right plate portion 42 and the left plate portion 43, and a pair of left and right upper bending pieces 66 provided at the front end portion of the lower plate portion 24, The front plate portion 25 is brought into contact with 67 from the front and fixed by screwing. Since the front ends of the right plate portion 42 and the left plate portion 43 and the front end portion of the lower plate portion 24 are fixed to the front plate portion 25, the right plate portion 42 and the left plate portion 43 and the lower plate Mutual positional relationship with the portion 24 can be prevented from being deviated.

In the above description, the right wall portion 31 and the left wall portion 32 of the inner case 20 are an example of "a pair of left and right side wall portions" of the present invention. The right plate portion 42 and the left plate portion 43 of the support plate 22 are an example of "a pair of left and right horizontal plate portions" of the present invention. The fixing holes 471, 481 provided in the inwardly bent pieces 47, 48 and the fixing holes 661, 671 provided in the upwardly bent pieces 66, 67 are examples of the "first fixing holes" of the present invention. The fixing holes 621, 622, 623, 624 provided in the front plate portion 25 are examples of the "second fixing holes" of the present invention. The screws 83, 84, 95, 96 are examples of "screws" of the present invention.

The present invention is not limited to the above embodiments, and various modifications are possible. The water heater 1 shown in FIG. 1 is a normal water heater provided with one heat exchanger 4, but a latent heat recovery type water heater provided with two heat exchangers for sensible heat recovery and latent heat recovery good.

The outer edge portions 662 and 672 of the upper bending pieces 66 and 67 have a mountain shape in which the height decreases on both left and right sides from a substantially center portion in the left and right direction when viewed from the front, but other shapes may be used. Preferably, the portion of the lower plate portion 24 located on the outer side in the left-right direction has a height that decreases toward the outer side. For example, only the right side of the outer edge 662 of the upper bent piece 66 is formed so that the height decreases toward the right, and only the left side of the outer edge 672 of the upper bent piece 67 is formed so as to decrease toward the left. You may form so that height may become low. The shape of the inwardly bent pieces 47 and 48 is also not limited to the above embodiment.

The protruding plate portions 49 and 50 have inclined portions 491 and 501 at their respective lower ends, but these may be omitted. The tip shape of the projecting plate portions 49 and 50 may be, for example, a rectangular shape, an arc shape, a triangular shape, etc., in addition to the shape of the above embodiment.

The number of burner units 51 constituting the unit group 23 may be plural, and may be more or less than 12 in the above embodiment.

Reference Signs List 1 water heater 3 combustion device 20 inner case 22 support plate 23 unit group 24 lower plate portion 25 front plate portion 31 right wall portion 32 left wall portion 33 rear wall portion 34 bottom wall portion 40 back plate portion 42 right plate portion 43 left plate Portions 47, 48 Inwardly bent pieces 49, 50 Protruding plate portion 51 Burner unit 66, 67 Upper bent pieces 83, 84, 95, 96 Screws 471, 481 Fixing holes 491, 501 Inclined parts 621 to 624 Fixing holes 661, 671 Fixing holes 662, 672 Outer edge P1, P2 Gap

Claims (5)

a unit group in which a plurality of burner units are arranged side by side;
a rear wall portion, a pair of left and right side wall portions extending forward from both left and right ends of the rear wall portion, and a bottom wall portion connected to the rear wall portion and the pair of left and right side wall portions to block a lower surface, an inner case that accommodates the unit group inside;
a back plate portion arranged on the inner surface side of the rear wall portion and supporting the rear portions of the plurality of burner units; and a pair of left and right horizontal plate portions arranged on the inner surface side of each of the pair of left and right side wall portions. a support plate disposed between the inner case and the unit group;
a lower plate portion disposed in the vicinity of the respective lower end portions of the pair of left and right horizontal plate portions and supporting the unit group from below;
The pair of left and right horizontal plate portions, and a front plate portion fixed to the front end portion of the lower plate portion and arranged on the front side of the unit group,
A pair of left and right inward bending pieces that are bent inward in the left-right direction of the inner case are provided at front ends of the pair of horizontal plate portions,
A pair of left and right upward bending pieces that are bent upward are provided on both left and right sides of the front end portion of the lower plate portion,
A first fixing hole penetrating in the front-rear direction is provided in each of the inwardly bent piece and the upwardly bent piece,
A portion of the front plate portion corresponding to the first fixing hole is provided with a second fixing hole penetrating in the front-rear direction,
The front plate portion is screwed into the first fixing hole and the second fixing hole while abutting on the front surfaces of the pair of left and right inward bending pieces and the pair of left and right upward bending pieces from the front. are fastened from the front to be fixed to the pair of left and right inward bending pieces and the pair of left and right upward bending pieces. 2. The pair of left and right horizontal plate portions according to claim 1, wherein projecting plate portions are provided at lower portions of the front end portions of the pair of left and right horizontal plate portions so as to project further forward than the inwardly bent pieces and the upwardly bent pieces. combustion device. A portion of the outer edge portion of the upper bending piece located outside the lower plate portion in the left-right direction is formed so that the height decreases toward the outer side,
3. The combustion apparatus according to claim 2, wherein a lower end portion of the projecting plate portion is provided with an inclined portion that is inclined so that the height position decreases from the front side to the rear side. 4. The combustion apparatus according to claim 2, wherein a gap corresponding to the thickness of said projecting plate portion is formed between said upper bent piece and said inner case. A water heater comprising the combustion device according to any one of claims 1 to 4.

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