Combustion device

Abstract

To provide a technology capable of preventing rainwater or the like suctioned from a drainage hole from adhering to components in a casing, in a combustor comprising a fan that suctions air in the casing.SOLUTION: A combustor disclosed herein comprises: a casing comprising a bottom plate; a combustion unit housed in the casing; and a fan that is housed in the casing, suctions air in the casing, and supplies the air to the combustion unit. The bottom plate is provided with a flat part, and a recess part recessed downward from the flat part. The recess part is provided with a drainage hole, and eaves arranged above the drainage hole. The drainage hole is located below the upper surface of the flat part. At least part of the eaves is located below the upper surface of the flat part.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] This specification relates to a combustion device.

Background Art

[0002] Patent Document 1 discloses a combustion device including a casing having a bottom plate, a combustion part housed in the casing, and a fan housed in the casing that sucks air in the casing and supplies the air to the combustion part. The bottom plate is provided with a flat part and a concave part recessed downward from the flat part. The concave part is provided with a drain hole. The drain hole is located below the upper surface of the flat part.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a combustion device including a fan that sucks air in a casing as in Patent Document 1, due to the negative pressure generated by the drive of the fan, rainwater or the like may be sucked into the casing from the drain hole. In this case, there is a risk that the rainwater or the like sucked from the drain hole scatters and adheres to the components in the casing. This specification provides a technique capable of suppressing the adhesion of rainwater or the like sucked from the drain hole to the components in the casing in a combustion device including a fan that sucks air in the casing.

Means for Solving the Problems

[0005] The combustion device disclosed in this specification includes a casing having a bottom plate, a combustion section housed within the casing, and a fan housed within the casing that sucks air within the casing and supplies the air to the combustion section. The bottom plate is provided with a flat portion and a concave portion that is recessed downward from the flat portion. The concave portion is provided with a drain hole and a cover disposed above the drain hole. The drain hole is located below the upper surface of the flat portion. At least a part of the cover is located below the upper surface of the flat portion.

[0006] Since the drain hole is provided in the bottom plate of the casing, usually, most of the components within the casing are disposed above the drain hole. For this reason, if rainwater or the like sucked in from the drain hole scatters upward, there is a risk that rainwater or the like will adhere to the components within the casing. According to the above configuration, a cover is disposed above the drain hole. For this reason, when rainwater or the like is sucked into the casing from the drain hole, the cover suppresses the scattering of rainwater or the like upward above the drain hole. According to the above configuration, in a combustion device including a fan that sucks air within the casing, it is possible to suppress rainwater or the like sucked in from the drain hole from adhering to the components within the casing. When providing such a cover, if the entire cover is disposed above the upper surface of the flat portion, in order to avoid interference between the components within the casing and the cover, it is necessary to increase the size of the casing. According to the above configuration, since at least a part of the cover is disposed below the upper surface of the flat portion, compared with the case where the entire cover is disposed above the upper surface of the flat portion, the size of the casing can be made smaller.

[0007] In one or more embodiments, the drain hole and the cover may be formed by performing a bending process directed inward on a part of the concave portion. In this specification, "inside" means the inside of the casing, and "outside" means the outside of the casing.

[0008] For example, when forming the drain hole and the eaves separately in the casing, it will lead to an increase in the manufacturing cost of the casing. According to the above configuration, by performing a bending process on the bottom plate of the casing, the drain hole and the eaves can be formed simultaneously. According to the above configuration, the manufacturing cost of the casing provided with the drain hole and the eaves can be reduced.

[0009] In one or more embodiments, the drain hole and the eaves may be formed by performing an inward throttling process on a part of the recess.

[0010] According to the above configuration, by performing a throttling process on the bottom plate of the casing, the drain hole and the eaves can be formed simultaneously, so the manufacturing cost of the casing provided with the drain hole and the eaves can be reduced. Also, according to the above configuration, the eaves formed by the throttling process rectify the inflow direction of the air passing through the drain hole along the direction of the bottom plate. According to the above configuration, rainwater or the like sucked into the casing from the drain hole is more likely to be guided along the direction of the bottom plate, so the scattering of rainwater or the like above the drain hole is more appropriately suppressed. According to the above configuration, in a combustion device provided with a fan for sucking air in the casing, it is possible to more appropriately suppress rainwater or the like sucked from the drain hole from adhering to the components in the casing.

[0011] In one or more embodiments, the recess may include a first plate portion inclined with respect to the flat portion. The drain hole may be provided in the first plate portion.

[0012] According to the above configuration, the suction direction when rainwater or the like is sucked into the casing from the drain hole becomes a direction inclined with respect to the upward direction. Therefore, the scattering of rainwater or the like above the drain hole is more appropriately suppressed. According to the above configuration, in a combustion device provided with a fan for sucking air in the casing, it is possible to more appropriately suppress rainwater or the like sucked from the drain hole from adhering to the components in the casing.

[0013] In one or more embodiments, the eaves may be connected to an upper portion of the periphery of the drain hole.

[0014] According to the above configuration, when rainwater or the like is sucked into the casing from the drain hole, the eaves can more appropriately suppress the scattering of rainwater or the like above the drain hole. According to the above configuration, in a combustion device provided with a fan for sucking air in the casing, it is possible to more appropriately suppress rainwater or the like sucked from the drain hole from adhering to the components in the casing.

[0015] In one or more embodiments, the recess may be inclined with respect to the flat portion, and may further include a second plate portion disposed opposite to the first plate portion in a direction along the flat portion.

[0016] According to the above configuration, when rainwater or the like is sucked into the casing from the drain hole, not only the eaves can suppress the scattering of rainwater or the like above the drain hole, but also the second plate portion can suppress the scattering of rainwater or the like in the direction along the flat portion. According to the above configuration, in a combustion device provided with a fan for sucking air in the casing, it is possible to more appropriately suppress rainwater or the like sucked from the drain hole from adhering to the components in the casing.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0018] (Embodiment) The water heater 2 of the present embodiment shown in FIG. 1 is arranged and used outdoors. The water heater 2 includes a casing 10. The casing 10 includes a front plate 12, a rear plate 14 (see FIG. 2), a right side plate 16 (see FIG. 2), a left side plate 18, a bottom plate 20 (see FIG. 2), and a top plate 22. The right side plate 16, the left side plate 18, and the top plate 22 are integrally formed. An exhaust port 122 for exhausting exhaust gas generated in a combustion unit 50 described later to the outside is provided at the upper part of the front plate 12. An air intake port 124 for taking in external air into the casing 10 is provided at the lower part of the front plate 12.

[0019] As shown in FIG. 2, the rear plate 14 and the bottom plate 20 are integrally formed. A water supply connection port 70 for connecting a water supply means for supplying water to the water heater 2, a hot water supply connection port 72 for connecting a hot water supply means for supplying hot water from the water heater 2, and a gas supply connection port 74 for connecting a gas supply means for supplying fuel gas to the water heater 2 are attached to the bottom plate 20.

[0020] As shown in FIG. 3, inside the casing 10, a control device 30, a fan 40, a combustion unit 50, an exhaust duct 60, a water supply pipe WP1, a hot water supply pipe WP2, and a gas supply pipe GP are accommodated.

[0021] The control device 30 is attached to the left side plate 18 at the lower part inside the casing 10. The control device 30 controls the operations of the fan 40, the combustion unit 50, and other components of the hot water supply device 2.

[0022] The fan 40 is provided in the central part inside the casing 10. The fan 40 has an air intake (not shown) that opens inside the casing 10. The fan 40 is connected to the combustion unit 50. While the fan 40 is driven, the air inside the casing 10 is sucked into the air intake of the fan 40 and supplied to the combustion unit 50.

[0023] The combustion unit 50 is provided above the fan 40. The combustion unit 50 includes a gas burner 52 and a heat exchanger 54. In the combustion unit 50, the heat exchanger 54 is provided above the gas burner 52. The gas burner 52 is connected to a gas supply connection port 74 via the gas supply pipe GP. The gas burner 52 burns the fuel gas supplied from the gas supply pipe GP using the air supplied from the fan 40 to generate combustion gas. The heat exchanger 54 heats the water flowing through the water pipe (not shown) inside the heat exchanger 54 with the combustion gas generated by the combustion of the gas burner 52. One end of the water pipe inside the heat exchanger 54 is connected to a water supply connection port 70 via the water supply pipe WP1. The other end of the water pipe inside the heat exchanger 54 is connected to a hot water supply connection port 72 via the hot water supply pipe WP2. Therefore, the water supplied to the hot water supply device 2 is heated by the heat exchanger 54 and supplied as hot water.

[0024] The exhaust duct 60 is provided above the combustion unit 50. The exhaust duct 60 is connected to the exhaust port 122 (see FIG. 1) of the front plate 12 and exhausts the combustion gas generated inside the combustion unit 50. That is, the combustion gas of the gas burner 52 passes through the heat exchanger 54 and is discharged to the outside from the exhaust duct 60.

[0025] (Configuration of the bottom plate 20) As shown in FIG. 4, the bottom plate 20 includes a flat portion 202, a first convex portion 210, a second convex portion 220, a third convex portion 230, a first concave portion 240a, and a second concave portion 240b. The flat portion 202 is formed in a plate shape that extends in the front-rear, left-right directions. The first convex portion 210, the second convex portion 220, and the third convex portion 230 protrude upward with respect to the flat portion 202. The first convex portion 210 includes a first mounting hole 212 for attaching the hot water supply connection port 72. The second convex portion 220 includes a second mounting hole 222 for attaching the water supply connection port 70. The third convex portion 230 includes a third mounting hole 232 for attaching the gas supply connection port 74. Note that the hot water supply connection port 72 is attached by sealing the gap generated between the hot water supply connection port 72 and the first mounting hole 212. The water supply connection port 70 is attached by sealing the gap generated between the water supply connection port 70 and the second mounting hole 222. The gas supply connection port 74 is attached by sealing the gap generated between the gas supply connection port 74 and the third mounting hole 232. Therefore, rainwater or the like is prevented from entering the casing 10 through the first mounting hole 212, the second mounting hole 222, and the third mounting hole 232.

[0026] The first concave portion 240a is provided on the front left side of the bottom plate 20. The second concave portion 240b is provided on the front right side of the bottom plate 20. The first concave portion 240a and the second concave portion 240b are recessed downward with respect to the flat portion 202. Therefore, rainwater or the like that has entered the casing 10 is guided to the first concave portion 240a or the second concave portion 240b. In this embodiment, the first concave portion 240a and the second concave portion 240b have a mirror-symmetrical shape. Therefore, it should be noted that the following description of the first concave portion 240a can be similarly applied to the second concave portion 240b.

[0027] As shown in Fig. 5, the first recess 240a includes a first plate portion 242a, a second plate portion 244a, a first connection portion 246a, a second connection portion 248a, and a third connection portion 250a. The first plate portion 242a is located at the rear side of the first recess 240a. The second plate portion 244a is located at the front side of the first recess 240a. The first plate portion 242a and the second plate portion 244a are arranged to face each other in the front-rear direction. The first connection portion 246a smoothly connects between the lower end of the first plate portion 242a and the lower end of the second plate portion 244a. The second connection portion 248a smoothly connects between the right end of the first plate portion 242a and the right end of the second plate portion 244a. The third connection portion 250a smoothly connects between the left end of the first plate portion 242a and the left end of the second plate portion 244a. A drain hole 262a and a eaves 264a are provided on the first plate portion 242a. The drain hole 262a and the eaves 264a are formed by performing an inward bending process on the first plate portion 242a. A burring screw hole 266a is provided on the second plate portion 244a.

[0028] As shown in Fig. 6, the bottom plate 20 and the front plate 12 are fastened by a screw member 400a. The screw member 400a fastens the bottom plate 20 and the front plate 12 by screwing into the burring screw hole 266a (see Fig. 5) from the outside. The left-right center of the drain hole 262a and the eaves 264a is arranged at a position offset to the left with respect to the left-right center of the burring screw hole 266a and the screw member 400a. The bending line L2 of the bending process on the first plate portion 242a extends along the left-right direction. The bending process on the first plate portion 242a is performed to bend the portion in front of the bending line L2. The drain hole 262a is formed in a trapezoidal shape that is symmetric about the left-right direction. The left-right width of the drain hole 262a decreases from the rear to the front. In this embodiment, the left-right length of the bending line L2 is 6 mm. The left-right width w1 of the front portion of the drain hole 262a is 4 mm.

[0029] As shown in FIG. 7, the first plate portion 242a is inclined from above to below at a substantially constant inclination angle with respect to the flat portion 202 as it extends from the rear to the front. The inclination angle of the first plate portion 242a with respect to the flat portion 202 is within the range of 30° to 45°. The second plate portion 244a is inclined from above to below at a substantially constant inclination angle with respect to the flat portion 202 as it extends from the front to the rear. The inclination angle of the second plate portion 244a with respect to the flat portion 202 is within the range of 60° to 70°. The first connecting portion 246a is curved from below to above as it extends from the central portion to the end portion of the first connecting portion 246a.

[0030] The drain hole 262a and the eaves 264a are entirely located below the upper surface of the flat portion 202. The drain hole 262a is provided to extend forward and downward from the base end portion 302a of the eaves 264a. That is, the base end portion 302a of the eaves 264a is connected to the rear upper side portion of the peripheral edge of the drain hole 262a. The bending angle of the base end portion 302a with respect to the first plate portion 242a at the bending line L2 is within the range of 20° to 60°. The eaves 264a are curved so that the inclination angle with respect to the first plate portion 242a decreases as it extends from the base end portion 302a to the tip end portion 304a. The tip end portion 304a of the eaves 264a extends forward beyond the front lower side portion of the peripheral edge of the drain hole 262a. In this embodiment, the width w2 of the drain hole 262a in the inclination direction of the first plate portion 242a is 10 mm. The maximum depth d in the vertical direction of the first recess 240a is 10 mm.

[0031] In the water heater 2 of this embodiment, due to the negative pressure generated in the casing 10 by driving the fan 40, rainwater or the like may be sucked inward from the drain hole 262a. In this case, the rainwater or the like sucked from the drain hole 262a flows in vigorously due to the negative pressure, but the eaves 264a that spread in the front-rear and left-right directions above the drain hole 262a reduce the upward momentum of the rainwater or the like. Further, since the base end portion 302a of the eaves 264a is sufficiently bent with respect to the first plate portion 242a, the eaves 264a do not prevent the rainwater or the like from being discharged from the drain hole 262a. As described above, the eaves 264a suppress the upward scattering of the rainwater or the like sucked inward from the drain hole 262a while ensuring the drainage performance of the drain hole 262a.

[0032] The screw member 400a fastens the front plate 12 to the bottom plate 20 by being screwed into the burring screw hole 266a in a state of passing through a hole (not shown) provided in the front plate 12. The tip portion 402a of the screw member 400a in a state of being screwed into the burring screw hole 266a is located below the upper surface of the flat portion 202.

[0033] When providing such a screw member 400a, if the tip portion 402a of the screw member 400a is located above the upper surface of the flat portion 202, it is necessary to increase the size of the casing 10 in order to avoid interference between the components in the casing 10 and the screw member 400a. In the screw member 400a of this embodiment, the tip portion 402a is located below the upper surface of the flat portion 202. Therefore, the size of the casing 10 can be made smaller compared to the case where the tip portion 402a is located above the upper surface of the flat portion 202.

[0034] (Modification example) In the above embodiment, as an example of the combustion device, the water heater 2 that heats the hot water supplied from the outside to supply hot water has been described. In another embodiment, the combustion device may be a combustion device other than the water heater 2. For example, the combustion device may be a heating device that heats and circulates the heating water. For example, the heating water may be antifreeze.

[0035] In the above-described embodiment, the configuration in which the fan 40 is provided at the central portion within the casing 10 has been described. Different from this, the fan 40 may not be provided at the central portion within the casing 10. For example, the fan 40 may be provided at the upper or lower portion within the casing 10.

[0036] In the above-described embodiment, the configuration in which the fan 40 is connected to the combustion unit 50 and while the fan 40 is being driven, the air within the casing 10 is sucked into the intake port of the fan 40 and supplied to the combustion unit 50 has been described. In another embodiment, the fan 40 may be disposed between the combustion unit 50 and the exhaust duct 60 and connected to each of the combustion unit 50 and the exhaust duct 60. In this case, the combustion unit 50 may be provided with an intake port. In this case, while the fan 40 is being driven, the air within the casing 10 may be sucked into the intake port of the combustion unit 50, and the combustion gas from the combustion unit 50 may pass through the fan 40 and the exhaust duct 60 and be discharged to the outside of the water heater 2 from the exhaust port 122 of the front plate 12.

[0037] In the above-described embodiment, the configuration in which the first recess 240a is provided in front of the bottom plate 20, the first recess 240a is provided with a burring screw hole 266a, and the front plate 12 is fastened to the first recess 240a of the bottom plate 20 by screwing the screw member 400a into the burring screw hole 266a has been described. Different from this, the first recess 240a may not be provided in front of the bottom plate 20. For example, the first recess 240a may be provided behind the bottom plate 20. The first recess 240a may not be provided with a burring screw hole 266a. In this case, the front plate 12 may be fastened to a portion of the bottom plate 20 that is not the first recess 240a.

[0038] In the above-described embodiment, the configuration in which, in the first plate portion 242a, the entire eaves 264a is located below the upper surface of the flat portion 202 has been described. In another embodiment, a part of the eaves 264a may be located above the upper surface of the flat portion 202, and the remaining part of the eaves 264a may be located below the upper surface of the flat portion 202.

[0039] In the above-described embodiment, the configuration in which the drain hole 262a and the eaves 264a are provided in the first plate portion 242a has been described. In another embodiment, the drain hole 262a and the eaves 264a may be provided in the second plate portion 244a. In still another embodiment, instead of the first recess 240a, the first recess 240a may include a flat portion connecting between the lower end of the first plate portion 242a and the lower end of the second plate portion 244a, and the drain hole 262a and the eaves 264a may be provided in the flat portion of the first recess 240a.

[0040] In the above-described embodiment, the bending line L2 of the bending process is along the left-right direction, and the configuration in which the bending process is performed to bend the portion below the bending line L2 has been described. Different from this, the bending line L2 of the bending process may not be along the left-right direction, and the bending process may be performed to bend the portion below the bending line L2. For example, the bending line L2 of the bending process may be along the up-down direction, and the bending process may be performed to bend the portion on the left side of the bending line L2.

[0041] In the above-described embodiment, the configuration in which the drain hole 262a and the eaves 264a are formed by performing a bending process on the first plate portion 242a inward has been described. In another embodiment, the drain hole 262a and the eaves 264a may be formed separately. For example, the drain hole 262a may be formed by performing a punching process on the first plate portion 242a, and the eaves 264a formed as a separate member may be welded to the peripheral portion of the drain hole 262a.

[0042] In yet another embodiment, as shown in FIG. 8, instead of the drain hole 262a and the eaves 264a, a drain hole 282a and an eaves 284a may be provided in the first plate portion 242a. The drain hole 282a and the eaves 284a may be formed by performing an inwardly tapered process on the first plate portion 242a. The eaves 284a have a tapered shape. An opening S2 is formed by a portion of the peripheral edge of the drain hole 282a that is not connected to the base end portion 322a of the eaves 284a and the tip end portion 324a of the eaves 284a. The opening S2 opens in a direction along the first plate portion 242a. Therefore, by the eaves 284a, the inflow direction of air through the drain hole 282a is rectified in the direction along the first plate portion 242a. Thus, even when rainwater or the like is sucked inward from the drain hole 282a due to the negative pressure generated in the casing 10 by the driving of the fan 40, the rainwater or the like is guided downward along the first plate portion 242a, so that the scattering of rainwater or the like above the drain hole 282a is suppressed.

[0043] (Corresponding relationship) As described above, in one or more embodiments, the water heater 2 (an example of a combustion device) includes a casing 10 having a bottom plate 20, a combustion unit 50 housed in the casing 10, and a fan 40 housed in the casing 10 that sucks air in the casing 10 and supplies air to the combustion unit 50. The bottom plate 20 is provided with a flat portion 202 and a first recess 240a that is recessed downward from the flat portion 202. The first recess 240a is provided with a drain hole 262a (or a drain hole 282a) and an eaves 264a (or an eaves 284a) disposed above the drain hole 262a (or the drain hole 282a). The drain hole 262a (or the drain hole 282a) is located below the upper surface of the flat portion 202. At least a part of the eaves 264a (or the eaves 284a) is located below the upper surface of the flat portion 202.

[0044] Generally, since the drain hole 262a (or the drain hole 282a) is provided in the bottom plate 20 of the casing 10, most of the components such as the control device 30, the fan 40, the combustion unit 50, the exhaust duct 60, the water supply pipe WP1, the hot water supply pipe WP2, and the gas supply pipe GP in the casing 10 are arranged above the drain hole 262a (or the drain hole 282a). According to the above configuration, a cover 264a (or a cover 284a) is arranged above the drain hole 262a (or the drain hole 282a). Therefore, when rainwater or the like is sucked into the casing 10 from the drain hole 262a (or the drain hole 282a), the cover 264a (or the cover 284a) suppresses the scattering of rainwater or the like above the drain hole 262a (or the drain hole 282a). According to the above configuration, in the water heater 2 including the fan 40 that sucks the air in the casing 10, it is possible to suppress the rainwater or the like sucked from the drain hole 262a (or the drain hole 282a) from adhering to the components in the casing 10. When providing such a cover 264a (or a cover 284a), if the entire cover 264a (or the cover 284a) is arranged above the upper surface of the flat portion 202, in order to avoid interference between the components in the casing 10 and the cover 264a (or the cover 284a), it is necessary to increase the size of the casing 10. According to the above configuration, since at least a part of the cover 264a (or the cover 284a) is arranged below the upper surface of the flat portion 202, compared with the case where the entire cover 264a (or the cover 284a) is arranged above the upper surface of the flat portion 202, the size of the casing 10 can be made smaller.

[0045] In one or more embodiments, the drain hole 262a and the cover 264a are formed by performing a bending process directed inward on a part of the first recess 240a.

[0046] For example, in the casing 10, when the drain hole 262a and the eaves 264a are formed separately, it will lead to an increase in the manufacturing cost of the casing 10. According to the above configuration, by performing a bending process on the bottom plate 20 of the casing 10, the drain hole 262a and the eaves 264a can be formed simultaneously. According to the above configuration, the manufacturing cost of the casing 10 provided with the drain hole 262a and the eaves 264a can be reduced.

[0047] In one or more embodiments, the drain hole 282a and the eaves 284a are formed by performing an inward necking process on a part of the first recess 240a.

[0048] According to the above configuration, by performing a necking process on the bottom plate 20 of the casing 10, the drain hole 282a and the eaves 284a can be formed simultaneously, so the manufacturing cost of the casing 10 provided with the drain hole 282a and the eaves 284a can be reduced. Further, according to the above configuration, the eaves 284a formed by the necking process rectify the inflow direction of air through the drain hole 282a in a direction along the first plate portion 242a (an example of the bottom plate). According to the above configuration, rainwater or the like inhaled into the casing 10 from the drain hole 282a is easily guided in a direction along the first plate portion 242a, so that the scattering of rainwater or the like above the drain hole 282a is more appropriately suppressed. According to the above configuration, in the water heater 2 provided with the fan 40 that sucks the air in the casing 10, it is possible to more appropriately suppress the adhesion of rainwater or the like inhaled from the drain hole 282a to the components in the casing 10.

[0049] In one or more embodiments, the first recess 240a includes a first plate portion 242a that is inclined with respect to the flat portion 202. The drain hole 262a (or the drain hole 282a) is provided in the first plate portion 242a.

[0050] According to the above configuration, when rainwater or the like is sucked into the casing 10 from the drain hole 262a (or the drain hole 282a), the suction direction is inclined with respect to the upward direction. For this reason, the scattering of rainwater or the like above the drain hole 262a (or the drain hole 282a) is more appropriately suppressed. According to the above configuration, in the water heater 2 including the fan 40 that sucks the air in the casing 10, it is possible to more appropriately suppress the adhesion of rainwater or the like sucked from the drain hole 262a (or the drain hole 282a) to the components in the casing 10.

[0051] In one or more embodiments, the eaves 264a (or the eaves 284a) are connected to the upper portion of the peripheral edge of the drain hole 262a (or the drain hole 282a).

[0052] According to the above configuration, when rainwater or the like is sucked into the casing 10 from the drain hole 262a (or the drain hole 282a), the eaves 264a (or the eaves 284a) more appropriately suppress the scattering of rainwater or the like above the drain hole 262a (or the drain hole 282a). According to the above configuration, in the water heater 2 including the fan 40 that sucks the air in the casing 10, it is possible to more appropriately suppress the adhesion of rainwater or the like sucked from the drain hole 262a (or the drain hole 282a) to the components in the casing 10.

[0053] In one or more embodiments, the first recess 240a is inclined with respect to the flat portion 202, and further includes a second plate portion 244a disposed opposite to the first plate portion 242a in the direction along the flat portion 202.

[0054] According to the above configuration, when rainwater or the like is sucked into the casing 10 from the drain hole 262a (or the drain hole 282a), not only is the scattering of rainwater or the like above the drain hole 262a (or the drain hole 282a) suppressed by the eaves 264a (or the eaves 284a), but also the scattering of rainwater or the like in the direction along the flat portion 202 is suppressed by the second plate portion 244a. According to the above configuration, in the water heater 2 including the fan 40 that sucks the air in the casing 10, it is possible to more appropriately suppress the adhesion of rainwater or the like sucked from the drain hole 262a (or the drain hole 282a) to the components in the casing 10.

[0055] As described above, the embodiments have been described in detail, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in this specification or the drawings can achieve a plurality of purposes simultaneously, and achieving one of those purposes itself has technical utility.

Explanation of Reference Numerals

[0056] 2: Water heater 10: Casing 12: Front plate 14: Rear plate 16: Right side plate 18: Left side plate 20: Bottom plate 22: Top plate 30: Control device 40: Fan 50: Combustion unit 52: Gas burner 54: Heat exchanger 60: Exhaust duct 70: Water supply connection port 72: Hot water supply connection port 74: Gas supply connection port 122: Exhaust port 124: Air intake 202: Flat part 210: First convex part 212: First mounting hole 220: Second convex part 222: Second mounting hole 230: Third convex part 232: Third mounting hole 240a: First concave part 240b: Second concave part 242a: First plate part 244a: Second plate part 246a: First connecting part 248a: Second connecting part 250a: Third connecting part 262a, 282a: Drain hole 264a, 284a: Eaves 266a: Burring screw hole 302a, 322a: Base end part of eaves 304a, 324a: Tip end part of eaves 400a: Screw member 402a: Tip end part of screw member GP: Gas supply pipe L2: Bend line S2: Opening WP1: Water supply pipe WP2: Hot water supply pipe

Claims

1. A casing having a bottom plate, a combustion section housed in the casing, and a fan housed in the casing that sucks air in the casing and supplies the air to the combustion section. The combustion device is characterized in that, the bottom plate is provided with a flat portion and a recess recessed downward from the flat portion, the recess is provided with a drain hole and a canopy disposed above the drain hole, the drain hole is located below the upper surface of the flat portion, and at least a part of the canopy is located below the upper surface of the flat portion. A combustion device.

2. The combustion device according to claim 1, wherein the canopy includes a base end portion connected to a linearly extending portion of a peripheral edge portion of the drain hole and a tip end portion extending from the base end portion.

3. The canopy includes a base end portion connected to a peripheral edge portion of the drain hole and a tip end portion extending from the base end portion. The combustion device according to claim 1, wherein an opening portion that opens in a direction along the bottom plate is formed by a portion of the peripheral edge portion of the drain hole that is not connected to the base end portion of the canopy and the tip end portion of the canopy.

4. the recess includes a first plate portion inclined with respect to the flat portion, and the drain hole is provided in the first plate portion. The combustion device according to any one of claims 1 to 3.

5. The combustion device according to claim 4, wherein the canopy is connected to an upper portion of a peripheral edge portion of the drain hole.

6. The combustion device according to claim 4 or 5, wherein the recess is inclined with respect to the flat portion and further includes a second plate portion disposed opposite to the first plate portion in a direction along the flat portion.

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