JP2023109397A - Water heater - Google Patents

Abstract

To suppress the uneven supply of air into a combustion device in a water heater.SOLUTION: A water heater 1 comprises a combustion device 3, a blower 7 and an air guide part 40. The combustion device 3 comprises a plurality of burners 140 and a case 120. The air guide part 40 comprises a plate part 42 and an air passage plate 52. The plate part 42 is arranged apart from a bottom face part 121 at a distance in a constitution for covering a plurality of hole parts 132 of the bottom face part 121 of the case 120 from below, and constituted so as to guide air into a space which is formed around itself while receiving air which is sent from the blower 7 by its own lower face 42A. The air passage plate 52 comprises a penetration hole part 54 being a flow-in port. The penetration hole part 54 is an inlet for allowing air to intrude into a second space 92 between the plate part 42 and the bottom face part 121 from a first space 91 around the plate part 42. In the water heater 1, air which intrudes into the second space 92 is introduced into the case 120 via a plurality of hole parts 132.SELECTED DRAWING: Figure 9

Description

The present disclosure relates to water heaters.

Patent Literature 1 discloses an example of a combustion device for gas appliances. The combustion apparatus of Patent Document 1 has a plurality of burner units and a storage case 20 that stores the plurality of burner units. The burner unit introduces fuel gas and primary air from an inlet provided on the upstream side of the gas flow path, and jets and ignites the mixture from a flame port provided on the downstream side of the gas flow path. is configured to cause the flame port to form a flame. In the storage case, a plurality of burner units are stored side by side in a positional relationship in which the intervals between the burner units are constant. Furthermore, in the storage case, a distribution path for circulating the primary air of the external air flowing in from the opening formed on the lower end side to the inlet of each burner unit, and the secondary air of the external air to the burner unit. A distribution route is formed for distribution to the space formed between the units.

Japanese Unexamined Patent Application Publication No. 2011-027338

Due to space considerations, a water heater employs a structure in which a blower is positioned below a combustion device so that air sent out by the blower is introduced into the combustion device. However, this type of configuration has the problem that the air supply tends to be non-uniform. For example, a nearby area that is likely to receive the air flow from the blower is greatly affected by the supplied air, and thus a relatively large pressure is likely to be applied. , the pressure tends to be low, so the pressure locally increases in some areas.

An object of the present disclosure is to provide a technology that facilitates suppressing non-uniform supply of air into a combustion device in a water heater.

A water heater, which is one of the present disclosure,
A combustion apparatus comprising a plurality of burners for burning gas and a case for housing the plurality of burners, wherein a plurality of holes are provided in the bottom surface of the case;
a blower disposed below the combustion device to supply air;
a housing that houses the combustion device and the blower;
a plate portion which is arranged at a distance from the bottom portion so as to cover the plurality of holes from below, and receives the air sent from the blower by its lower surface and guides the air to a space around itself; ,
an inlet that is an inlet through which the air enters from the first space around the plate portion to the second space between the plate portion and the bottom portion;
has
The air entering the second space is introduced into the case through the plurality of holes.

The technology according to the present disclosure tends to suppress non-uniform supply of air into the combustion device in the water heater.

FIG. 1 is a front view illustrating the water heater according to the first embodiment. FIG. FIG. 2 is a front view schematically showing the configuration of the water heater of FIG. 1 with the front cover, operating device, etc. omitted. FIG. 3 is a front view schematically showing a configuration in which the gas distribution section and the like are omitted from the configuration in FIG. 4 is a perspective view schematically showing the vicinity of the gas distribution section in the water heater of FIG. 1. FIG. 5 is a perspective view schematically showing a heat exchanger, a combustion device, a blower, etc. in the water heater of FIG. 1. FIG. FIG. 6 is a perspective view schematically showing a configuration in which front wall portions, side wall portions, rear wall portions, etc. are omitted from the configuration of FIG. FIG. 7 is a perspective view schematically showing a configuration in which the air guide portion and the like are omitted from the configuration of FIG. 6. FIG. 8 is a perspective view showing a partial configuration, a gas distribution section, an air blower, etc. in the combustion device in the water heater of FIG. 1. FIG. FIG. 9 is a perspective cross-sectional view schematically showing a configuration obtained by cutting the configuration of FIG. 8 along a predetermined cutting plane. 10 is a perspective cross-sectional view schematically showing a configuration (including a combustion device, a gas distribution section, a bottom wall section, a blower, etc.) near the combustion device of the water heater of FIG. 1, cut at a predetermined position; FIG. .

Embodiments of the present disclosure are listed and illustrated below. It should be noted that the features exemplified below may be combined in any consistent combination.

[1] A combustion apparatus comprising a plurality of burners that burn gas and a case that houses the plurality of burners, wherein a plurality of holes are provided in the bottom surface of the case;
a blower disposed below the combustion device to supply air;
a housing that houses the combustion device and the blower;
a plate portion which is arranged at a distance from the bottom portion so as to cover the plurality of holes from below, and receives the air sent from the blower by its lower surface and guides the air to a space around itself; ,
an inlet that is an inlet through which the air enters from the first space around the plate portion to the second space between the plate portion and the bottom portion;
has
A water heater in which the air entering the second space is introduced into the case through the plurality of holes.

In the water heater of [1] above, the air sent from the blower can be received by the lower surface of the plate and guided to the space around the plate, so that the air from the blower can be prevented from entering the plurality of holes directly. can be suppressed. Therefore, this water heater can suppress uneven supply due to direct entry of air from the blower into the case. Moreover, in this water heater, the air supplied from the blower is guided from the vicinity of the plate portion to the surrounding space (first space), and then flowed into the space (second space) between the plate portion and the bottom portion. In addition, since it can be introduced into multiple holes located on the back side (upper side) of the plate, the effect of the blower's pressure in the vicinity of the multiple holes tends to be alleviated, and the air is more evenly distributed to the case. Easy to get inside.

[2] The blower has an air outlet for discharging the air,
The water heater according to [1], wherein the blower port and the lower surface of the plate portion are arranged to vertically face each other.

In the water heater of [2] above, the blower can be brought closer to the bottom part, so the blower and the combustion device can be configured more compactly. is planned.

[3] Pluralities arranged respectively on the front and rear sides and on the left and right sides of the second space so as to partially block the space between the front, rear, left, and right outer edge portions of the plate portion and the bottom portion and surround the second space. having an air passage plate of
A plurality of through holes are provided in each of the air passage plates,
The water heater according to [1] or [2], wherein the through hole portion is the inlet.

The water heater of [3] can introduce air into the second space through a plurality of air passage plates respectively arranged on both the front and rear sides and on the left and right sides of the second space. That is, since the air can be more evenly introduced into the second space from the front, back, left, and right of the second space, the air can more uniformly enter the second space. Moreover, in each air passage plate, since the air flows so as to pass through the plurality of through holes, it is possible to prevent the pressure from being excessively biased in a part of the region even in the process of passing through the air passage plate. Therefore, the air can be more uniformly introduced into the case.

[4] having a gas distribution unit having a plurality of nozzles for discharging the gas;
The case has a front wall portion provided with a plurality of inlets,
The gas distribution section is configured to cover the front wall section from the front side,
The plurality of inlets are paths for introducing the gas distributed from the gas distribution part into the case, and the gas introduced through each of the inlets is directed to each of the burners. comprising a configuration supplied to
a third space through which the air flows is defined between the front wall portion and the gas distribution portion;
part of the air guided by the lower surface enters the third space;
The water heater according to any one of [1] to [3], wherein the air in the third space enters the case through the plurality of inlets.

The water heater of [4] can allow part of the air received and guided by the lower surface of the plate portion to flow through the third space to the plurality of inlets. The plurality of inlets are paths for introducing gas from the gas distribution portion to each burner, and the presence of the plate portion allows the water heater to satisfactorily guide the air to the respective inlets. Therefore, in this water heater, it is easy to supply primary air for combustion to each burner, and it is easy to improve the combustion performance of the burner.

<First embodiment>
The following description relates to the water heater 1 according to the first embodiment.
1. Overall Configuration of Water Heater 1 FIG. 1 is a front view illustrating a water heater 1 according to a first embodiment. FIG. 2 is a front view schematically illustrating a configuration in which the front cover 2A is removed from the housing 2 of the water heater 1. As shown in FIG.

As shown in FIG. 2, the water heater 1 includes a housing 2, a combustion device 3, a heat exchanger 4, an exhaust section 5, a fan 7, and the like. The housing 2 is a box-shaped case made of a metal material, and includes a housing main body 2B forming a box shape with an open front, and a front cover 2A (FIG. 1) detachable from the housing main body 2B. Prepare. The front cover 2A shown in FIG. 1 closes the housing body 2B from the front side. As shown in FIG. 2, the housing 2 accommodates components such as the combustion device 3, the heat exchanger 4, the exhaust section 5, the blower 7, and the like. The combustion device 3 is arranged near the center inside the housing 2 . The heat exchanger 4 is arranged above the combustion device 3 inside the housing 2 . The exhaust unit 5 is arranged above the heat exchanger 4 inside the housing 2 . The gas distributor 10 is arranged between the combustion device 3 and the front cover 2A. The blower 7 is arranged below the combustion device 3 inside the housing 2 .

In this specification, the longitudinal direction of the rectangular front cover 2A is the vertical direction, and the vertical direction when the water heater 1 is installed is the vertical direction. The direction in which the side wall portions provided on the left and right sides of the housing body 2B extend is the vertical direction. The lateral direction of the front cover 2A is the lateral direction, and the direction orthogonal to the vertical direction and the lateral direction is the front-rear direction. In the example of FIG. 1, the front-rear direction is the direction orthogonal to the flat surface having the largest area on the front surface of the front cover 2A. Further, in the example shown in FIG. 2 and the like, the shaft portion of the motor in the blower 7 is configured to rotate about the rotation axis, and the direction of this rotation axis is the front-rear direction. The thickness direction (plate thickness direction) of the portion (plate-like portion) of the front wall portion 124 where the introduction port 125 is formed is the front-rear direction. The direction in which the plurality of upper introduction ports 125A are arranged is the left-right direction, and the direction in which the plurality of lower introduction ports 125B are arranged is also the left-right direction. The direction in which the plurality of burners 140 are arranged is also the horizontal direction.

The combustion device 3 shown in FIGS. 2 and 3 is a device that burns gas (fuel gas) supplied through the gas distributor 10 . The combustion device 3 includes a case 120, a group of burners, and the like. The case 120 is a box-shaped case that fits inside the housing 2 . The burner group is a burner group in which burners 140, which are flattened dark and light burners, are arranged side by side in the horizontal direction. A discharge electrode for ignition, a flame rod for flame detection, and the like are provided on the upper front surface of the case 120 . Details of the combustion device 3 will be described later.

The heat exchanger 4 shown in FIGS. 2 and 3 is a device to which the combustion exhaust gas generated by the combustion of the gas in the combustion device 3 is supplied. The heat exchanger 4 includes a metal casing 4A forming an outer shell of the heat exchanger 4, and heat transfer tubes at least partially housed inside the casing 4A. The heat exchanger 4 introduces the combustion exhaust discharged from the combustion device 3 and passes it through the interior, and performs heat exchange between the combustion exhaust and the water flowing in the heat transfer tube, so that the water in the heat transfer tube to heat. The combustion exhaust that has passed through the heat exchanger 4 is discharged to the exhaust section 5 .

The exhaust section 5 shown in FIGS. 2 and 3 includes an exhaust section main body 5A and an exhaust tube 110 . The exhaust section main body 5A is a flow path for guiding upward combustion exhaust gas discharged from the heat exchanger 4, and is configured as a case body made of a metal material, for example. The exhaust pipe 110 is arranged so as to straddle the inside and outside of the exhaust portion main body 5A, and functions as a flow path for discharging the combustion exhaust inside the exhaust portion main body 5A to the outside of the water heater 1 .

The blower 7 shown in FIGS. 2 and 3 is a fan that supplies combustion air. The blower 7 includes a drive unit having a motor, blades, etc., and a blower port 162 (FIGS. 8 and 9) that is an opening for supplying combustion air. The blower port 162 is arranged below the combustion device 3 . In the blower 7, for example, when the drive shaft of a motor (not shown) rotates, a plurality of blades interlocking with the drive shaft rotate, and the air flow generated by the rotation of the plurality of blades causes the upper side (combustion device 3 side) for forced air flow. Note that the configuration of the blower 7 illustrated here is merely an example, and fans of various known configurations can be employed as long as they are configured to forcibly supply air from the blower port 162 .

As shown in FIG. 2, the water heater 1 is provided with a gas inlet 191 to which an external gas pipe is connected, a water inlet 192 to which a water pipe is connected, and a hot water outlet 193 on the lower side of the housing 2. ing. The water inlet 192 is an inlet through which water is introduced from a water pipe provided outside the water heater 1 . Water introduced into the water inlet 192 is supplied to the heat transfer tubes of the heat exchanger 4 via the water supply pipe 115 . A portion of the water supply pipe 115 is illustrated in FIG. Hot water outlet 193 is a hot water outlet for leading hot water to the outside of water heater 1 . The hot water guided by the heat transfer pipe of the heat exchanger 4 is discharged from the hot water outlet 193 through the hot water discharge pipe 116 connected to the downstream end of the heat transfer pipe.

In water heater 1 shown in FIG. 2 , gas inlet 191 is an inlet through which gas is introduced from a gas pipe provided outside water heater 1 . The gas introduced into the gas inlet 191 is supplied into the gas distribution section 10 via a gas supply section 114 having a main valve, a proportional valve, and the like.

2. Detailed Configuration of Gas Distribution Unit 10 and Combustion Device 3 The gas distribution unit 10 is a flat gas distribution unit. The gas distribution unit 10 shown in FIG. 4 and the like divides the fuel gas introduced into the inside via the gas supply unit 114 and discharges the fuel gas into the combustion device 3 through the nozzle 34. is. The gas distribution unit 10 is assembled to the lower side of the front wall portion of the case 120 so as to cover the introduction port 125 provided in the front wall portion 124 of the case 120 . As shown in FIG. 10 , the gas distributor 10 includes a first plate-like closing member 11 , a second plate-like closing member 12 , and a sheet-like packing member 13 . The second closing member 12 shown in FIG. 2 overlaps the first closing member 11 in the front-rear direction so as to cover the first closing member 11 from the front side, and the packing member 13 is interposed therebetween. The first closing member 11, the second closing member 12, and the packing member 13 are arranged so as to overlap each other in the front-rear direction. A gas flow path 18 through which fuel gas flows is provided inside the gas distribution unit 10 . The first closing member 11 includes a plurality of inlets (not shown) for introducing fuel gas from the gas supply section 114 and a plurality of nozzles 34 , and the gas flow path 18 extends from the inlets to the plurality of nozzles 34 . It is configured as a flow path that guides gas to.

As shown in FIGS. 4 and 10, the multiple nozzles 34 include multiple upper nozzles 34A and multiple lower nozzles 34B. The plurality of upper nozzles 34A are arranged side by side in the horizontal direction. A plurality of lower nozzles 34B are arranged side by side in the horizontal direction. Nozzle pairs 33 are provided side by side in the left-right direction, each having one upper nozzle 34A and one lower nozzle 34B. Each nozzle pair 33 is provided in association with each burner 140 (concentration burner) shown in FIG. 8 and the like. That is, the gas supplied from one nozzle pair 33 is supplied to one burner 140 arranged at the point (rear side) to which this nozzle pair 33 faces. The gas supplied from the upper nozzle 34A is supplied into the burner 140 from the upper inlet 142 of the burner 140 . The gas supplied from the lower nozzle 34B is supplied into the burner 140 from the lower inlet 144 of the burner 140 . 8 to 10 show only some burners 140 among the plurality of burners 140 provided in the combustion device 3, and illustration of other burners 140 is omitted.

As shown in FIGS. 8 to 10, the combustion device 3 is provided with a plurality of burners 140 inside a case 120. FIG. The case 120 is an inner case provided inside the housing 2 and is a case that accommodates a plurality of burners 140 . The case 120 includes a front wall portion 124, a rear wall portion 128, side wall portions 126 and 127, and a bottom portion 121, which are configured in a box shape. The upper end of case 120 is configured as an open opening. Specifically, the front wall portion 124 and the rear wall portion 128 face each other in the front-rear direction, and the side wall portion 126 and the side wall portion 127 face each other in the left-right direction. . The front wall portion 124, the rear wall portion 128, and the side wall portions 126 and 127 are formed in a plate shape from one or more metal plates. The upper ends of the front wall portion 124 , the rear wall portion 128 , and the side wall portions 126 and 127 are the openings. Acts as an outlet for

As shown in FIGS. 3 and 10 , the front wall portion 124 of the case 120 is provided with a plurality of inlets 125 . Each inlet 125 is a path for introducing the gas distributed from the gas distributor 10 into the case 120 . The combustion device 3 is configured such that gas introduced through each inlet 125 is supplied to each burner 140 . The plurality of inlets 125 includes a plurality of upper inlets 125A and a plurality of lower inlets 125B. A plurality of upper introduction ports 125A are arranged side by side in the left-right direction. A plurality of lower introduction ports 125B are arranged side by side in the left-right direction. A pair of inlets 125Z, each of which includes one upper inlet 125A and one lower inlet 125B, is provided side by side in the horizontal direction. Each inlet pair 125Z is provided in association with each burner 140 (concentration burner) shown in FIG. 8 and the like. The gas entering through one inlet pair 125Z is supplied to one burner 140 adjacent to this inlet pair 125Z from the rear side. Specifically, each inlet pair 125Z is provided so as to correspond to each nozzle pair 33. In each nozzle pair 33, the gas discharged through the upper nozzle 34A is supplied to the upper nozzle 34A. Gas introduced into the burner 140 through the adjacent upper inlet 125A and discharged through the lower nozzle 34B is introduced into the burner 140 through the lower inlet 125B adjacent to the lower nozzle 34B. be done.

The bottom portion 121 functions as the bottom of a box-shaped space (a space for burning gas) that accommodates the plurality of burners 140 . The bottom portion 121 is formed in a plate shape by using a metal plate, for example. The plurality of holes 132 are evenly distributed to the left and right so as to extend from the area near the left end to the area near the right end of the bottom surface 121, and extend from the area near the front end to the area near the rear end of the bottom surface 121. They are evenly distributed in the front and rear so as to extend. The plurality of holes 132 are provided as through holes vertically penetrating the plate-shaped bottom surface portion 121 . Air is configured to pass through each of the plurality of holes 132 .

The combustion device 3 functions to burn gas (fuel gas) supplied into the combustion device 3 via the gas distribution section 10 within the case 120 . Exhaust gas (combustion exhaust gas) generated by the combustion of gas in the case 120 is discharged from the opening at the upper end of the case 120, flows into the casing 4A of the heat exchanger 4, passes through the heat exchanger 4, and passes through the exhaust port. Flow into 5. The exhaust that has flowed into the exhaust portion 5 is discharged to the outside of the water heater 1 through the exhaust pipe 110 .

3. Air Guide Section The following description relates to the air guide section 40 and its peripheral configuration.
As shown in FIG. 10 , the rear wall portion 128 of the combustion device 3 extends below the bottom surface portion 121 . Both side wall portions 126 and 127 also extend below the bottom surface portion 121 . The gas distribution section 10 is fixed to the front wall section 124 and extends below the bottom surface section 121 . The gas distribution part 10 is fixed to the front wall part 124 while overlapping the front wall part 124 in the vicinity of the upper end. The space below the bottom surface portion 121 is surrounded by the gas distribution portion 10, the side walls 126 and 127, and the rear wall portion 128, and the bottom wall portion 129 closes the space below the bottom portion. is provided. That is, the bottom wall portion 129 is provided so as to close the opening at the lower end of the peripheral wall portion formed by the gas distribution portion 10, the side wall portions 126 and 127, and the rear wall portion 128. As shown in FIG. The bottom wall portion 129 is arranged below the bottom surface portion 121 with a distance from the bottom surface portion 121 . The bottom wall portion 129 is formed in a plate shape, one plate surface, which is an upper surface, faces upward, and the other plate surface, which is a lower surface, faces downward. An air guiding portion 40, which will be described later, is provided in a space between the bottom portion 121 and the bottom wall portion 129. As shown in FIG.

In this specification, it is a space below the bottom surface portion 121 and above the bottom wall portion 129 and outside the second space 92, and is a space outside the region immediately below the plate portion 42 (plate portion 42 ) is the first space 91 . The second space 92 is a space between the plate portion 42 and the bottom portion 121 and surrounded by the air passage plate 52 on both front and rear sides and on both left and right sides.

As shown in FIG. 10, the front wall portion 124 of the case 120 includes an upper front wall portion 124A and a lower front wall portion 124B. The upper front wall portion 124A and the lower front wall portion 124B are stepped so as to be in the rear position. The front surfaces of the upper front wall portion 124A and the lower front wall portion 124B both face forward. The plate thickness direction of the upper front wall portion 124A and the lower front wall portion 124B is the front-rear direction. Specifically, a plate-like bent portion 124C is provided so as to be bent rearward from the lower end portion of the upper front wall portion 124A configured in a plate shape, and is bent downward from the rear end portion of the bent portion 124C. A lower front wall portion 124B is provided in a plate shape. The gas distribution part 10 is connected to the upper front wall part 124A and integrally formed so as to continue downward from the upper front wall part 124A, and is formed in a plate shape with the gas distribution part 10 formed in a plate shape. Together with the upper front wall portion 124A, the front wall of the unit in which the gas distribution portion 10 and the combustion device 3 are integrated is configured. The lower front wall portion 124</b>B is arranged on the rear side of the gas distribution portion 10 with a distance from the rear surface portion of the gas distribution portion 10 . The rear surface (rear surface) of the gas distribution unit 10 and the front surface of the lower front wall portion 124B are arranged to face each other, and a third space 93 is provided between the rear surface (rear surface) of the gas distribution unit 10 and the front surface of the lower front wall portion 124B. is configured. The third space 93 is a space through which air can flow. The third space 93 is partitioned on the front side by the gas distribution portion 10, on the rear side by the lower front wall portion 124B, on both left and right sides by the side wall portions 126 and 127, and on the upper side by the bent portion 124C. Space. That is, the third space 93 is a space surrounded by the bent portion 124C, the gas distribution portion 10, the lower front wall portion 124B, and the side wall portions 126 and 127 on both front and rear sides, on both left and right sides, and on the upper side. It is a space that continues to the 1 space 91 . In the above unit, when the air supplied from the blower 7 flows into the first space 91 , part of the air flowing into the first space 91 flows into the third space 93 .

The blower 7 is arranged below the combustion device 3 and operates to supply air from a blower port 162 provided in the blower case 161 . Specifically, at least part of the air blowing port 162 faces the lower surface 42A of the plate portion 42, and the air blowing port 162 and the lower surface 42A are arranged to face each other vertically. The upper end portion of the blower 7 is fixed to the bottom wall portion 129 , and an opening (not shown) formed in the bottom wall portion 129 communicates with the space inside the blower case 161 . The air outlet 162 is arranged facing upward. The blower port 162 communicates with the opening of the bottom wall portion 129 , and the air discharged from the blower port 162 is sent upward through the opening of the bottom wall portion 129 . The wind (air from the blower 7 ) passing through the opening of the bottom wall portion 129 is upward wind, and this upward wind directly hits the lower surface 42 A of the plate portion 42 provided above the air blow port 162 . Since there is no member blocking the wind between the opening of the bottom wall portion 129 and the lower surface 42A, the lower surface 42A directly receives the wind from the air blowing port 162. As shown in FIG.

The air guide portion 40 includes a plate portion 42 and an air passage plate 52 . The plate portion 42 is formed on a flat plate and arranged at a distance from the bottom portion 121 so as to cover the plurality of holes 132 from below. The plate thickness direction of the plate portion 42 is, for example, the same direction as the plate thickness direction of the bottom portion 121 . The upper surface of the plate portion 42 is arranged along the lower surface of the bottom surface portion 121 and parallel to the lower surface. 42 A of lower surfaces of the board part 42 are arrange|positioned so that the air blow port 162 may be covered from the upper side. The plate portion 42 functions to receive the air sent from the blower 7 by the lower surface 42A and guide the air to the surrounding space. That is, when the air sent from the blower 7 hits the lower surface 42A, the air is dispersed in the front, rear, left, and right directions along the lower surface 42A. The air dispersed in the front, rear, left, and right directions along the lower surface 42</b>A tends to move to the first space 91 out of the region immediately below the plate portion 42 .

The air passage plate 52 is a portion that allows air to flow from the first space 91 to the second space 92 . The air passage plates 52 are arranged on both the front and rear sides and the left and right sides of the second space 92 so as to partially block the space between the front, rear, left, and right outer edges of the plate portion 42 and the bottom portion 121 and surround the second space 92 . be done. Specifically, the air passage plate 52 has a front passage plate 52A, a rear passage plate 52B, one side passage plate 52C, and the other side passage plate 52D. is provided integrally with the

The front passage plate 52</b>A rises from the front end of the plate portion 42 and partially closes the space between the front end of the plate portion 42 and the bottom surface portion 121 . The rear passage plate 52</b>B is arranged to rise from the rear end of the plate portion 42 and partially blocks the space between the rear end of the plate portion 42 and the bottom surface portion 121 . The one-side passage plate 52C is disposed so as to be tilted from one end of the plate portion 42 in the left-right direction, and partially extends between the one end of the plate portion 42 in the left-right direction and the bottom surface portion 121. Block. The other-side passage plate 52</b>D is disposed so as to be inclined and raised from the other-side end of the plate portion 42 in the left-right direction, and partially extends between the other-side end of the plate portion 42 in the left-right direction and the bottom surface portion 121 . Block. A plurality of through holes 54 are formed in each of the front passage plate 52A, the rear passage plate 52B, the one side passage plate 52C, and the other side passage plate 52D. The through-hole portion 54 corresponds to an example of an inflow port, and functions as an inlet through which air enters from the above-described first space 91 to the above-described second space 92 . Air entering the second space 92 from the first space 91 is introduced into the case 120 through the plurality of holes 132 .

A region of the first space 91 on the front side of the front passing plate 52</b>A communicates with the third space 93 . That is, the air passage partitioned by the lower front wall portion 124B and the gas distribution portion 10 communicates with the air passage partitioned by the front passage plate 52A and the gas distribution portion 10 . Therefore, of the air that is supplied from the blower 7 and guided by the plate portion 42, part of the air that is led to the front side flows into the space between the front passage plate 52A and the gas distribution portion 10 (a part of the first space 91). part) to enter the third space 93 . Part of the air that has flowed into the third space 93 enters the case 120 through a plurality of inlets 125 formed in the lower front wall portion 124B. This entrained air acts as primary air during combustion in burner 140 .

4. Example of Effect In the water heater 1, the air sent from the blower 7 is received by the lower surface 42A of the plate portion 42, and can be guided to the space around the plate portion 42. 132 can be suppressed. Therefore, the water heater 1 can suppress uneven supply caused by air from the blower 7 directly entering the case 120 . Moreover, the water heater 1 guides the air supplied from the blower 7 from the vicinity of the plate portion 42 to the surrounding space (first space 91), and then the space between the plate portion 42 and the bottom portion 121 (second space 91). 92), and can be introduced into the plurality of holes 132 arranged on the back side (upper side) of the plate portion 42, so that the pressure from the blower 7 does not affect the vicinity of the plurality of holes 132. It is easily relieved, and the air easily enters into the case 120 more uniformly.

Since the water heater 1 is arranged such that the blower port 162 and the lower surface 42</b>A face each other vertically, the blower 7 can be brought closer to the bottom surface portion 121 . Therefore, in the water heater 1, the blower 7 and the combustion device 3 can be configured more compactly, and even with such a compact configuration, uniformity of supplied air can be achieved.

The water heater 1 can introduce air into the second space 92 through a plurality of air passage plates 52 arranged on both front and rear sides and on both left and right sides of the second space 92 . That is, since the air can be more evenly introduced into the second space 92 from the front, back, left, and right of the second space 92 , the air can more uniformly enter the second space 92 . Moreover, in each air passage plate 52, the air flows so as to pass through the plurality of through holes 54, so that even in the process of passing through the air passage plate 52, the pressure is prevented from being excessively biased in a part of the region. can. Therefore, the air can be introduced into the case 120 more uniformly.

The water heater 1 can allow part of the air received and guided by the lower surface 42A of the plate portion 42 to flow through the plurality of inlets 125 via the third space 93 . The plurality of inlets 125 are paths for introducing gas from the gas distribution section 10 to each burner 140, and the presence of the plate portion 42 allows the water heater 1 to favorably introduce air to each of the inlets 125. can. Therefore, the water heater 1 can easily supply the primary air for combustion to each burner 140 and easily improve the combustion performance of the burner 140 .

<Other embodiments>
The invention is not limited to the embodiments illustrated by the above description and drawings. For example, the features of the embodiments described above or below can be combined in any consistent manner. Also, any feature of the embodiments described above or below may be omitted if not explicitly indicated as essential. Furthermore, the embodiments described above may be modified as follows.

In the above embodiment, the through holes 54 are provided on both the front and rear sides and on the left and right sides of the plate section 42, but they may be provided on one or more of the front, rear, left, and right sides.

In the above embodiment, the air passage plate 52 is provided between the outer edge portion of the plate portion 42 and the bottom surface portion 121. May be open.

It should be noted that the embodiments disclosed this time should be considered as examples in all respects and not restrictive. The scope of the present invention is not limited to the embodiments disclosed this time, and includes all modifications within the scope indicated by the claims or within the scope equivalent to the claims. is intended.

Reference Signs List 1: Water heater 2: Housing 3: Combustion device 7: Blower 10: Gas distributor 34: Nozzle 42: Plate 42A: Lower surface 52: Air passage plate 54: Through hole (inlet)
91 : first space 92 : second space 93 : third space 120 : case 121 : bottom portion 124 : front wall portion 125 : inlet 132 : hole 140 : burner 162 : air outlet

Claims (4)

A combustion apparatus comprising a plurality of burners for burning gas and a case for housing the plurality of burners, wherein a plurality of holes are provided in the bottom surface of the case;
a blower disposed below the combustion device to supply air;
a housing that houses the combustion device and the blower;
a plate portion which is arranged at a distance from the bottom portion so as to cover the plurality of holes from below, and receives the air sent from the blower by its lower surface and guides the air to a space around itself; ,
an inlet that is an inlet through which the air enters from the first space around the plate portion to the second space between the plate portion and the bottom portion;
has
A water heater in which the air entering the second space is introduced into the case through the plurality of holes. The blower has an air outlet for discharging the air,
The water heater according to claim 1, wherein the blower port and the lower surface of the plate portion are arranged to vertically face each other. an air passage plate arranged to partially block a space between the outer edge of the plate portion and the bottom portion;
A plurality of through holes are provided in the air passage plate,
The water heater according to claim 1 or 2, wherein the through hole portion is the inlet. a gas distribution unit having a plurality of nozzles for discharging the gas;
The case has a front wall portion provided with a plurality of inlets,
The gas distribution section is configured to cover the front wall section from the front side,
The plurality of inlets are paths for introducing the gas distributed from the gas distribution part into the case, and the gas introduced through each of the inlets is directed to each of the burners. comprising a configuration supplied to
a third space through which the air flows is defined between the front wall portion and the gas distribution portion;
part of the air guided by the lower surface enters the third space;
The water heater according to any one of claims 1 to 3, wherein the air in the third space enters the case through the plurality of inlets.

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