JP2020085292A - Water heater - Google Patents

Abstract

To suppress excessive fuel gas supply to a nozzle region located on the extension of a mainstream of fuel gas.SOLUTION: In a gas distribution unit 6 of a water heater, a gas inlet is formed at the lower end of each passage part 45, 47, while a second nozzle region (extension upper nozzle region) located on the extension of a mainstream S of combustion gas in the first passage part 45 connected to a first distribution part 44, and first and third nozzle regions (non-extension upper nozzle regions) not located on the extension of the mainstream S are juxtaposed in the right-left direction in the first distribution part 44 of a body 30; and in a portion of a lid body 31 that covers the first passage part 45 and the second nozzle region, a first bulge part 66 bulging forward is formed, while in a portion that covers the second nozzle region E2, a flat part 69 (non-bulging part) that does not project forward is formed.SELECTED DRAWING: Figure 16

Description

The present invention relates to a water heater including a burner unit including a plurality of burners and a gas distribution unit that distributes and supplies a fuel gas to each burner of the burner unit.

The water heater is provided with a combustion device having a burner unit in which a plurality of burners are arranged side by side in the left-right direction in a housing, and a heat exchanger arranged above the combustion device. The combustion exhaust gas of the burner unit, which ignites and burns the mixture of air with, heats the water passing through the heat exchanger to discharge it.
Further, as disclosed in Patent Document 1, a manifold (gas distribution unit) for supplying fuel gas to each burner of the burner unit is provided on the front surface of the combustion device. This gas distribution unit is composed of a main body having a nozzle projecting toward the burner, a lid plate attached to the front side of the main body, and a seal member for sealing between the main body and the lid plate. The recessed portion and the raised portion provided on the inner surface of the lid form a gas passage on the downstream side to which the fuel gas is supplied, and a plurality of distribution passages each communicating with the gas passage and each having a different number of nozzle regions. ing.
Here, by controlling the opening and closing of the gas flow hole between the gas passage and the distribution passage with a solenoid valve, it is possible to select the burner group to be burned and change the combustion capacity.

JP, 2005-143588, A

In the conventional gas distribution unit described above, a long gas passage is formed in the left-right direction to kill the momentum of the supplied fuel gas, which makes it difficult to make the gas distribution unit compact. Therefore, it is conceivable to omit the gas passages for the sake of compactness. However, when the fuel gas that is not deenergized flows obliquely downward to the region where the nozzles are arranged side by side in the left and right direction Of the fuel gas is excessively supplied to the nozzle region located on the extension of the fuel cell, and the fuel gas is excessively supplied to the nozzle region deviating from the extension of the fuel gas so that the fuel gas is evenly distributed to each nozzle region even within one distribution passage. It becomes impossible to distribute and supply.

Therefore, the present invention suppresses the excessive supply of the fuel gas to the nozzle region located on the extension of the main flow of the fuel gas, and evenly supplies the fuel gas to the nozzle region located on the non-extension of the main flow. It is intended to provide a water heater that can be supplied.

In order to achieve the above object, the invention according to claim 1 has a burner unit in which a plurality of burners are juxtaposed in the left-right direction in an enclosure, and an inner case for housing the burner unit. On the front surface of the case, a plurality of nozzles for supplying fuel gas to each burner are arranged side by side in the left-right direction, and a plurality of distribution sections in which the nozzles are divided into a predetermined number and a lower portion of each distribution section are inclined. A water heater to which is attached a gas distribution unit comprising a main body having a plurality of passage portions connected to each other, and a lid body attached to the front surface of the main body and covering a plurality of distribution portions and a plurality of passage portions,
An inlet for fuel gas is formed at a lower end of each passage, and at least one distributor of the main body has an extension located above an extension of the main flow of the combustion gas in the passage connected to the distributor. The upper nozzle region and the non-extending upper nozzle region that is not located on the extension of the main flow are juxtaposed in the left-right direction, and a portion of the lid that covers the passage portion and at least a part of the non-extending upper nozzle region is located forward. A bulging portion that bulges is formed, while a non-bulging portion that does not bulge forward is formed in a portion that covers the extension upper nozzle region.
According to a second aspect of the present invention, in the structure of the first aspect, the boundary portion between the bulging portion and the non-bulging portion corresponding to the passage portion and the extension upper nozzle region is located at the lower end of the extension upper nozzle region. It is characterized in that it is formed in the left-right direction along.

According to the first aspect of the present invention, the non-bulging portion is formed in the portion of the lid that covers the extension upper nozzle region, so that the fuel gas is prevented from being excessively supplied to the extension upper nozzle region. The fuel gas can be evenly supplied to the non-extended upper nozzle area.
According to the invention of claim 2, in addition to the effect of claim 1, the boundary portion between the bulging portion and the non-bulging portion is formed in the left-right direction along the lower end of the extension upper nozzle region. Therefore, the flow of fuel gas can be guided in the left-right direction. Therefore, it is possible to promote the supply of the fuel gas to the non-extending upper nozzle region where it is difficult to supply the fuel gas, and it is possible to uniformly supply the fuel gas to the non-extending upper nozzle region.

It is a front view of the water heater with the front cover removed. It is a perspective view of a combustion device. It is an exploded perspective view of a combustion device and a gas distribution unit. It is a front view of a main body. It is a rear view of a main body. 3A and 3B are explanatory views of the harness holding portion, in which FIG. 1A is an enlarged perspective view from the lower rear side, and FIG. FIG. 6 is an explanatory diagram of a fuel gas flow dividing action by the rear flow dividing protrusions. It is a front view of a lid. It is a rear view of a lid. It is a perspective view from the front of a lid. It is a perspective view from the back of a lid. It is explanatory drawing of the fuel flow dividing action by the front side flow dividing protrusion. It is a front view of a gas distribution unit. (A) is the sectional view on the AA line of FIG. 13, (B) is a sectional view on the BB line. 13A is a sectional view taken along the line CC of FIG. 13, and FIG. (A) is a plan view of the gas distribution unit, (B) is a sectional view taken along the line EE. (A) is an enlarged view of the A part of FIG. 14, and (B) is an enlarged view of the B part. FIG. 16A is an enlarged view of a C portion in FIG. 15, and FIG. It is explanatory drawing of the branching action of the fuel gas by a rear side and front side branching projection.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an explanatory view showing an example of a water heater, showing a housing 2 from the front with a front cover on the front removed. The water heater 1 includes a rectangular box-shaped casing 2 in which a combustion device 3, a heat exchanger 4, and an exhaust hood 5 are installed in order from below. A gas distribution unit 6 for distributing and supplying a fuel gas to a burner unit 21 described later in the combustion device 3 is attached to the front surface of the combustion device 3, and a supply air for supplying combustion air is supplied to the lower surface of the combustion device 3. The qi fan 7 is assembled. Below the combustion device 3 on the front side of the air supply fan 7, a controller 8 that houses an electric board is erected sideways on the inner bottom surface of the housing 2.
The heat exchanger 4 includes a plurality of fins (not shown) inside the casing at predetermined intervals in the left-right direction, and a heat transfer tube 9 penetrating each fin in a meandering manner. Combustion exhaust gas passing between the fins from below. It is possible to exchange heat with the water flowing in the heat transfer tube 9.
The exhaust hood 5 has an oblong exhaust cylinder 10 on the front surface, penetrates the front cover and projects forward, and is capable of discharging the combustion exhaust passing through the heat exchanger 4 to the outside.

A gas inlet 11 to which an external gas pipe is connected, a water inlet 12 to which a water pipe is connected, and a hot water outlet 13 to which a pipe to a hot water tap is connected are provided on the lower surface of the housing 2. .. Of these, the gas inlet 11 is connected to the gas distribution unit 6 in the housing 2 via a gas supply unit 14 including a main valve, a proportional valve, and the like. The water inlet 12 is connected to the upstream end of the heat transfer pipe 9 of the heat exchanger 4 via the water supply pipe 15, and the hot water outlet 13 is connected to the downstream end of the heat transfer pipe 9 via the hot water discharge pipe 16. ..

As shown in FIGS. 2 and 3, the combustion device 3 includes a plurality of flat light and dark burners 22, 22,... The burner unit 21 is accommodated via an L-shaped inner plate 23 in a side view. Each of the rich and thin burners 22 has a light-side inlet and a rich-side inlet, not shown, which are opened forward and into which fuel gas and primary air are introduced, and a thick-side inlet. It has a flame hole portion 24 composed of thick flame holes. On the front surface of the inner plate 23, the lower light gas supply holes 25, which are oval-shaped burring holes, are provided corresponding to the light-side inlets and the dark-side inlets of the respective dark-light burners 22, and a circular shape. An upper concentrated gas supply hole 26, which is a burring hole, is juxtaposed in the left-right direction, and is exposed at an opening formed in the lower front surface of the inner case 20. A discharge electrode 27 for ignition and a frame rod 28 for flame detection, which penetrates through the inner case 20 and protrudes above the burner unit 21, and a viewing window 29 are provided on the upper front surface of the inner case 20.

The gas distribution unit 6 is assembled on the front surface of the inner case 20 so as to close the opening at the lower front surface of the inner case 20. The gas distribution unit 6 has a flat shape including a rear body 30, a front lid 31, and a seal body 32 interposed between the body 30 and the lid 31. The gas supply unit 14 is connected.

(Description of the body)
First, the main body 30 is in the form of a plate made of aluminum die casting, and as shown in FIG. 4, includes a horizontally long upper plate portion 33 and a lower plate portion 34 that is connected downward from the left side of the upper plate portion 33. It has an L-shape when viewed from the front, and through holes 35, 35 for screwing to the inner case 20 are formed on the outer peripheral side of the upper plate portion 33 and the lower plate portion 34. Also. As shown in FIG. 6, on the right end edge of the upper plate portion 33, two convex portions 37, 37 projecting forward and two L-shaped claw portions 38 projecting forward and then bending rightward. , 38 are alternately arranged to form a harness holding portion 36. That is, when a harness such as a temperature sensor provided on the heat exchanger 4 side is routed to the controller 8, the harness 39 (a plurality may be provided) is provided on the convex portion 37 and the claw portion 38, as shown by a two-dot chain line in FIG. By alternately locking the harness 39, the harness 39 can be linearly held along the right edge of the upper plate portion 33.

In particular, a notch 33a that is recessed to the left is formed at the right end edge of the upper plate portion 33 where the upper claw portion 38 is provided, and the claw portion 38 is displaced to the left side of the upper and lower convex portions 37, 37. Has been done. Therefore, the harness 39 caught on the claw portion 38 between the upper and lower convex portions 37, 37 is linearly routed without protruding to the right. As a result, even when the heater 18 (FIG. 1) provided in the hot water outlet pipe 16 of the heat exchanger 4 approaches the right side of the upper plate portion 33, the distance between the harness 39 and the heater 18 is secured and the heater 18 is secured. It is possible to prevent the harness 39 from being adversely affected by the heat.

A gas distribution portion 40 surrounded by an endless ridge 41 is formed in an inner region surrounded by each through hole 35 on the front surface of the main body 30. The upper side of the gas distributor 40 has a quadrangular shape that surrounds a region that overlaps the formation region of the light gas supply holes 25 and the rich gas supply holes 26 of each of the light and dark burners 22 provided in the inner plate 23 in the front-rear direction. The lower side of the gas distributor 40 is tapered toward the lower left side as it goes downward, and the width thereof is gradually narrowed. As shown in FIG. 5 and FIG. 6, in the upper region of the gas distributor 40, a pair of upper and lower portions are provided corresponding to the light gas supply holes 25 and the rich gas supply holes 26 of each of the light and dark burners 22, and are arranged in the rear. A pair of upper and lower nozzles 42, 42 formed to project to the side are arranged in parallel in the left-right direction according to the number of the light and dark burners 22.
However, the number of sets of nozzles 42, 42 (the number of density burners 22) is different between the left and right in the ridge 41 (here, the number of sets of the nozzles 42 on the right side is larger than the number of sets of the nozzles 42 on the left side). In this way, the upper region is divided, and the lower region is also formed with continuous middle ridges 43 which are divided left and right so that the right side width is larger than the left side width in accordance with the number of sets of nozzles 42, 42.

Therefore, in the gas distribution part 40, the first distribution part 44 in which the number of sets of the nozzles 42, 42 is increased on the right side of the middle protrusion 43, and the wide inclined first part connected to the lower part from the lower left end of the first distribution part 44. 1 passage part 45, a second distribution part 46 in which the number of nozzles 42, 42 on the left side of the middle ridge 43 decreases, and a second narrow sloped path connecting downward from the lower left end of the second distribution part 46 The part 47 is formed. The lower portions of the first passage portion 45 and the second passage portion 47 are formed so as to become deeper backward as they go downward, and the gas inlets 48, 48 are formed. The gas inlets 48, 48 are opened/closed by electromagnetic valves 17, 17 provided in the gas supply unit 14.
Further, the projecting ridges 41 and the middle projecting ridges 43 are provided with screw holes 49, 49 for screwing the lid 31 at predetermined intervals. At the uppermost horizontal portion of the ridge 41, short ridges 50, 50,... are continuously formed downward at predetermined intervals in the left-right direction, and screw holes 49 are also formed at the lower ends of the short ridges 50. Has been done. Further, on the front surface of the protrusion 41, positioning protrusions 51, 51,... For the seal body 32 are provided so as to protrude forward.

The upper portion of the first passage portion 45 is inclined toward the right side, and by the upper inclined portion 43a of the middle ridge 43 and the inclined portion 41a of the ridge 41, which are bent in a letter shape when viewed from the front, as the upper portion goes upward. The narrow passage 52 is formed below the left end of the first distribution portion 44 so that the passage width is tapered. The downstream side of the narrow portion 52 is an expanded portion 53 that expands to the right and communicates with the entire lower end of the first distribution portion 44.
As a result, the first distributing unit 44 includes the first nozzle region E1 at the left end closest to the narrow portion 52, the second nozzle region E2 adjacent to the first nozzle region E1 via one short protrusion 50, and the second nozzle region E2. It is semi-partitioned into two third nozzle regions E3 and E3 adjacent to the nozzle region E2 and farthest from the narrow portion 52. Here, the second nozzle region E2 is located on an extension of the main flow S of the fuel gas that flows along the shape of the first passage portion 45 and heads toward the narrow portion 52 at the substantially central portion of the tapered portion. The region E1 is located on the left side of the extension of the main flow S, and the third nozzle regions E3, E3 are located on the right side of the extension of the main flow S.

A rear flow dividing projection 55 is formed on the downstream side of the narrow portion 52 in the main flow S. As shown in FIG. 7, the rear flow dividing projection 55 has a horizontally long rectangular shape when viewed from the front, and the front surface is formed such that the left side surface 56 has a height slightly lower than that of the middle ridge 43. However, the front surface of the rear-side flow dividing projection 55 is gradually lowered from the front end of the left side surface 56 toward the right side, and is an inclined surface 58 that forms the lower surface 57 in a downwardly sloping slope. The rear-side flow dividing projection 55 is disposed in the left-right direction at the boundary between the first distribution portion 44 and the first passage portion 45, with the lower left corner portion 59 positioned substantially at the center downstream of the narrow portion 52.

Therefore, a part of the main flow S of the fuel gas flowing past the narrow portion 52 of the first passage portion 45 first comes into contact with the lower left corner portion 59 of the rear side flow dividing projection 55 to be divided into left and right, and is divided into the left side surface 56 side. A part of the fuel gas is guided upward along the left side surface 56 and flows into the first nozzle region E1 as shown by the solid arrow a. A part of the fuel gas branched to the lower surface 57 side gets over the lower surface 57 due to the inertia of the main flow S, passes in front of the rear flow dividing projection 55 as shown by a solid arrow b, and flows into the second nozzle region E2. The other part of the fuel gas branched to the lower surface 57 side is directly guided to the right side along the lower surface 57 as shown by the solid arrow c and flows from the expanded portion 53 to the third nozzle regions E3, E3. In this way, a part of the main flow S of the fuel gas is distributed to the first to third nozzle regions E1 to E3 by the rear side flow dividing projections 55, respectively.

(Explanation of lid)
As shown in FIGS. 8 and 9, the lid body 31 is a metal plate which has a substantially same shape as the gas distribution portion 40 of the main body 30 in a front view and is press-molded so as to cover the gas distribution portion 40 from the front. .. As shown in FIGS. 10 and 11, a peripheral edge portion 65 that covers the outer periphery of the protrusion 41 of the main body 30 is formed by folding back on the outer periphery of the lid body 31, and the first distribution portion 44 is formed on the front surface of the lid body 31. And a first bulge portion 66 that bulges forward and swells over the first passage portion 45, and a second bulge portion that bulges forward and overlaps over the second distribution portion 46 and the second passage portion 47. A projecting portion 67 is formed. Through holes 68, 68 for screwing are formed outside and between the bulging portions 66, 67.
In addition, a portion of the lid 31 that covers the first and second nozzle regions E1 and E2 is a flat portion 69 that does not bulge forward, and a lower end of the flat portion 69 (an upper end of the first bulging portion 66) is formed. A rising portion 70 in the left-right direction that rises forward and downward is provided corresponding to the boundary portion between the first distributing portion 44 and the first passage portion 45.

As shown in FIG. 12, a front shunting projection 71 having a substantially square shape in front view is projected rearward (inward) on the first bulging portion 66 at the leftward portion of the rising portion 70. Is drawn so that As shown in FIGS. 13 to 16, the front-side flow dividing projection 71 is located near the left end portion of the expanding portion 53 and overlaps with the upper left side of the rear-side flow dividing projection 55 of the main body 30 in the front-rear direction, and the lower left corner portion 72 is located at the rear side. It is located on the downstream side of the main flow S with respect to the lower left corner 59 of the flow dividing projection 55. In this state, a gap is formed in the front-rear direction between the front flow dividing protrusion 71 and the rear flow dividing protrusion 55.

Therefore, a part of the main flow S that flows in the first bulge portion 66 beyond the narrow portion 52 of the first passage portion 45 comes into contact with the lower left corner portion 72 of the front side flow-dividing projection 71 and is divided into the left and right sides, and the left side surface 73 A part of the fuel gas branched to the side is guided upward as it is along the left side surface 73 as indicated by the dotted arrow a, passes over the rising portion 70, and flows toward the first nozzle region E1 side. A part of the fuel gas diverted to the lower surface 74 side passes behind the front diverter projection 71 and passes through the gap with the rear diverter projection 55 as shown by a dotted arrow b due to the inertia of the main flow S, or the dotted arrow As shown by c, it is guided by the lower surface 74 and flows to the right side of the front flow dividing projection 71. However, in the lid 31, the entrance to the second nozzle region E2 is narrowed by the flat portion 69, and the rising portion 70 is formed in the left-right direction at the upper end of the first bulging portion 66. As shown by d, most of the part of the fuel gas is guided to the right by the rising portion 70 and flows to the third nozzle regions E3, E3. That is, in the first bulging portion 66, only a part of the fuel gas that has submerged in the flat portion 69 flows into the second nozzle region E2.

The seal body 32 is formed of cork, rubber, or the like, and is formed along the protrusion 41, the middle protrusion 43, and the short protrusion 50 of the main body 30 as shown in FIG. Has a through hole 80 and a small hole 81 at a portion corresponding to the positioning protrusion 51. Further, it has a mesh shape including connecting portions 82, 82,... For connecting the through holes 80.

In this gas distribution unit 6, the sealing body 32 is fitted to the front surface of the main body 30, the through holes 80 are aligned with the positions of the screw holes 49, and the positioning projection 51 is inserted into the small hole 81. Set on the front surface of the short ridge 50. In this state, by covering the lid 31 from the front and screwing the bolts 85, 85,... Through which the through holes 68 of the lid 31 and the through holes 80 of the seal body 32 penetrate from the front into the screw holes 49, respectively. The assembly of the gas distribution unit 6 is completed as shown in FIGS.
In this state, the front surface of the first distributing portion 44 and the first passage portion 45 on the main body 30 side is closed by the lid 31, and the first bulging portion 66 is attached to the first distributing portion 44 and the first passage portion 45. 16 to 18, the rising portion 70 is located in front of the boundary position between the first distributing portion 44 and the first passage portion 45, and the front diversion protrusion 71 is located on the rear side. It is located in front of the flow dividing projection 55. Similarly, the front surface of the second distributing portion 46 and the second passage portion 47 on the main body 30 side is closed by the lid 31, and the second bulging portion 67 is formed in the second distributing portion 46 and the second passage portion 47. Straddle and cover from the front.
The main body 30 of the gas distribution unit 6 thus assembled is screwed to the lower front portion of the inner case 20 from the front with screws 86, 86... (FIG. 1), and the gas supply unit 14 is screwed to the rear surface of the lower end of the main body 30. Then, the assembling of the gas distribution unit 6 to the combustion device 3 is completed.

In the water heater 1 configured as described above, when the hot water tap connected to the pipe of the hot water outlet 13 is opened and water is passed through the appliance, the controller 8 which detects this opens the gas flow path of the gas supply unit 14. Is opened to supply the fuel gas to the gas distribution unit 6, and the air supply fan 7 is operated to supply the combustion air. Therefore, the fuel gas supplied from the nozzle 42 of the gas distribution unit 6 is supplied from the light gas supply holes 25 and the rich gas supply holes 26 of the inner plate 23 together with the primary air through the light side introduction ports and the dark side introduction ports. It is supplied to each density burner 22. When the discharge electrode 27 is continuously discharged by the controller 8, the air-fuel mixture ejected from the flame hole portion 24 of each density burner 22 burns. The combustion exhaust gas of the burner unit 21 is heat-exchanged with the water passing through the heat transfer pipe 9 of the heat exchanger 4 from the water supply pipe 15, becomes hot water of the set temperature, and is discharged from the hot water discharge pipe 16. The controller 8 controls the opening/closing of the gas inlets 48, 48 by operating the solenoid valves 17, 17 of the gas supply unit 14 in accordance with the required combustion amount, so that the burner unit 21 burns three light/dark burners 22 at a time. Control in stages.

Here, when the fuel gas is supplied from the first distribution portion 44 and the first passage portion 45 of the gas distribution unit 6, the first distribution portion 44 and the first bulge portion 66 have the first passage portion 45 as described above. A part of the main flow S of the fuel gas that has passed through the narrow portion 52 comes into contact with the rear flow dividing projection 55 of the main body 30 and is divided as shown by solid arrows a to c in FIGS. 7 and 19. Further, the other part of the mainstream S abuts on the front side flow-dividing projection 71 of the lid 31 and the rising portion 70 located at the lower end of the flat portion 69, so that the dotted arrows a to d of FIGS. Shunted to. Therefore, the fuel gas is evenly distributed to the first nozzle region E1 and the third nozzle region E3 without being concentrated in the second nozzle region E2 which is an extension of the main flow S.
When the fuel gas is supplied from the second distributing portion 46 and the second passage 47, the main flow of the fuel gas flowing through the second passage 47 flows substantially in the center of the second distributing portion 46, so that there is no diversion protrusion. The fuel gas is evenly distributed to each nozzle 42.

(Effects related to invention of rear side flow dividing projection of main body)
As described above, according to the water heater 1 of the above-described embodiment, the gas inlets 48 are formed at the lower ends of the passages 45 and 47, respectively, while the first distributor 44 of the main body 30 includes the first distributor. The second nozzle region E2 (extension upper nozzle region) located on the extension of the main flow S of the combustion gas in the first passage portion 45 connected to the first passage portion 44 and the second nozzle region E2 not located on the extension of the main flow S of the first passage portion 45. The first and third nozzle regions E1 and E3 (non-extended upper nozzle regions) are arranged side by side in the left-right direction, and the first passage portion 45 is provided between the first passage portion 45 and the second nozzle region E2 in the main body 30. Since the rear-side flow dividing projection 55 that distributes a part of the fuel gas flowing from the first to third nozzle regions E1 and E3 is provided, the main flow S of the fuel gas flowing toward the second nozzle region E2 is It is possible to divide the flow into the nozzle region E1 and the third nozzle region E3, and it is possible to supply the fuel gas to the first and third nozzle regions E1 and E3 in which the fuel gas hardly flows. Therefore, the fuel gas can be uniformly distributed and supplied to each of the nozzle regions E1 to E3 without forming the gas passage for depressurizing the fuel gas so as to extend in the left-right direction. The weight can be reduced.

In particular, here, since the rear-side flow dividing projection 55 is formed in a horizontally long rectangular shape extending in the left-right direction when viewed from the front, it is possible to reliably divide the fuel gas into the first nozzle region E1 and the third nozzle region E3. it can.
Further, since the rear flow dividing projection 55 is formed so as to gradually lower from the end portion on the side closer to the first passage portion 45 to the end portion on the far side, the second nozzle region E2 side has the same height. It is possible to prevent the pressure loss in the vicinity of the second nozzle region E2 from being excessively increased as compared with the case of being blocked by the shunting protrusions. Therefore, an appropriate amount of fuel gas can be passed over the rear flow dividing projection 55 and guided to the second nozzle region E2. Further, by making the side closer to the narrow portion 52 higher, it is possible to suppress the fuel gas that has branched into the first nozzle region E1 from flowing over the rear side flow dividing projection 55 to the second nozzle region E2 side, and the first nozzle It is possible to secure the outflow amount to the area E1.
A part of the fuel gas from the first passage portion 45 is located at a position where the first passage portion 45 and the second nozzle region E2 of the lid 31 overlap with the rear flow dividing projection 55 in the front-rear direction. Since the front-side flow dividing projections 71 that distribute the fuel gas to the first and third nozzle regions E1 and E3 are provided, the fuel gas can be divided more reliably in combination with the rear-side flow dividing projections 55.

The shape of the rear flow dividing projections is not limited to the above-described form, and for example, the front view shape may be an ellipse or an ellipse, or the front view inverted L-shape including the vertical wall portion and the horizontal wall portion. It can be appropriately changed such as by forming a slant so that it becomes lower. A plurality of rear flow dividing projections may be provided, or a separate rear flow dividing projection may be attached to the front surface of the main body.
Further, in the invention relating to the rear flow dividing projections, it is possible to eliminate the front flow dividing projections and distribute the fuel gas only by the rear flow dividing projections. The flat part of the lid can also be omitted.
Further, depending on the configurations of the second distributing portion and the second passage portion, the rear flow dividing protrusion may be provided between the second distributing portion and the second passage portion. The same applies when three or more sets of the distribution unit and the passage unit are provided.

(Effects related to the invention of the front side flow dividing projection of the lid)
As described above, according to the water heater 1 of the above-described embodiment, the gas inlets 48 are formed at the lower ends of the passages 45 and 47, respectively, while the first distributor 44 of the main body 30 includes the first distributor. A second nozzle region E2 located on the extension of the main flow S of the combustion gas in the first passage portion 45 connected to the first and third nozzle regions E2 not located on the extension of the main flow S of the first passage portion 45. E1 and E3 are arranged side by side in the left-right direction, and a part of the fuel gas flowing from the first passage portion 45 is provided between the first passage portion 45 and the second nozzle region E2 in the lid 31 as a first and a second portion. Since the front-side flow dividing projection 71 that distributes to the three-nozzle regions E1 and E3 is provided, the main flow S of the fuel gas flowing toward the second nozzle region E2 is divided into the first nozzle region E1 and the third nozzle region E3. Therefore, the fuel gas can be supplied also to the first and third nozzle regions E1 and E3 where the fuel gas hardly flows. Therefore, the fuel gas can be uniformly distributed and supplied to each of the nozzle regions E1 to E3 without forming the gas passage for depressurizing the fuel gas so as to extend in the left-right direction. The weight can be reduced.

In particular, here, the narrow portion 52 having the narrowest passage width is formed in the first passage portion 45 in which the front diversion protrusion 71 is provided, and the front diversion protrusion 71 is arranged on the downstream side of the narrow portion 52. Therefore, the main flow S of the fuel gas can be split more effectively.
In addition, the first passage portion 45 is connected to the left end portion of the first distribution portion 44, and the downstream side of the narrow portion 52 is expanded to the right end portion to be an expanded portion 53 that is connected to the front side shunt. Since the protrusion 71 is arranged closer to the left end of the expanding portion 53, even if the first passage portion 45 has a shape expanding rightward from the narrow portion 52, the front side flow dividing protrusion 71 makes the fuel gas uniform. Can be supplied to.
Furthermore, since the lid 31 is a metal plate to be press-molded and the front side flow-dividing projection 71 is formed by drawing on the metal plate, the manufacturing cost can be kept low.

The shape of the front-side flow-dividing projections is not limited to the above-described form, and the front-side flow-dividing projections may be formed to have a horizontally long rectangular shape that extends in the left-right direction like a rear-side flow-dividing projection, or may be drawn into an inverted L shape. It doesn't matter. It is also possible to make the depth gradually shallower from the left end to the right side like the rear shunt. It is also possible to attach the front-side flow dividing projection to the inner surface of the lid as a separate body.
Further, in the invention relating to the front flow dividing projection, it is possible to eliminate the rear flow dividing projection and distribute the fuel gas only by the front flow dividing projection. The flat part of the lid can also be omitted.

(Effects related to invention of flat portion of lid)
As described above, according to the water heater 1 of the above-described embodiment, the gas inlets 48 are formed at the lower ends of the passages 45 and 47, respectively, while the first distributor 44 of the main body 30 includes the first distributor. A second nozzle region E2 located on the extension of the main flow S of the combustion gas in the first passage portion 45 connected to the first and third nozzle regions E2 not located on the extension of the main flow S of the first passage portion 45. E1 and E3 are arranged side by side in the left-right direction, and a first bulging portion 66 that bulges forward is provided at a portion of the lid 31 that covers the first passage portion 45 and the first and third nozzle regions E1 and E3. On the other hand, since the flat portion 69 (non-bulging portion) that does not bulge forward is formed in the portion that covers the second nozzle region E2, the fuel gas is excessively supplied to the second nozzle region E2. It is possible to supply the fuel gas evenly to the first and third nozzle regions E1 and E3 by preventing this.

In particular, here, the boundary portion (the rising portion 70) between the first bulging portion 66 and the flat portion 69 corresponding to the first passage portion 45 and the second nozzle region E2 is located at the lower end of the second nozzle region E2. Since it is formed in the left-right direction, the flow of the fuel gas can be guided in the left-right direction. Therefore, it is possible to promote the supply of the fuel gas to the third nozzle region E3 which is difficult to supply the fuel gas away from the narrow portion 52, and the fuel gas can be uniformly supplied to the third nozzle region E3. ..

In the above embodiment, the front side of the first nozzle region of the lid is also a flat portion, but only the front side of the second nozzle region may be a flat portion. The lower end of the flat portion is not limited to the boundary portion between the first distribution portion and the first passage portion, and may be set above or below the boundary portion. The shape of the rising portion and the length in the left-right direction can be changed as appropriate. The non-bulging portion is not limited to the flat portion, but may be a concave portion that is recessed rearward.
Further, in the invention relating to the flat portion of the lid body, it is possible to dispense with the rear flow dividing projections and the front flow dividing projections to distribute the fuel gas only by the flat portion.

(Effects related to invention of harness holding portion of main body)
As described above, according to the water heater 1 of the above-described embodiment, the front surface of the right end portion of the main body 30 is provided with the convex portion 37 protruding forward and the claw portion 38 having the tip protruding outward rightward. Since the harness holding portions 36 that are alternately arranged in the direction are formed, the main body 30 of the gas distribution unit 6 is used to easily collect the harness 39 of electronic components such as a temperature sensor without increasing the number of components. It will be possible.
In particular, here, one of the claw portions 38 is arranged so as to be shifted toward the center portion in the left-right direction of the main body 30 from the convex portions 37, 37 located above and below, so that a part of the harness 39 is separated from the convex portion 37. Can also be hooked in a straight line at the center side. Therefore, even when the heater 18 provided in the hot water outlet pipe 16 of the heat exchanger 4 is close to the right side of the upper plate portion 33, the harness 39 can be separated from the heater 18 and the adverse effect of the heat of the heater 18 can be prevented. ..

Note that the number of convex portions and claw portions is not limited to the above-described form, and may be increased or decreased as appropriate, and a plurality of claw portions may be arranged rather than the upper and lower convex portions so as to be shifted toward the central portion side. Further, the harness holding portion may be provided at the left end portion or both end portions. The shapes of the convex portion and the claw portion can be changed as appropriate.

Then, in common with each invention, the configuration of the water heater itself is not limited to the above-mentioned form, but is of a latent heat recovery type having a sub heat exchanger, or an exhaust hood having an exhaust tube protruding upward from the housing. Alternatively, each of the above inventions can be applied even if each burner of the burner unit is not a light and dark burner and one inlet and one supply hole are provided.

1... Water heater, 2... Casing, 3... Combustion device, 4... Heat exchanger, 6... Gas supply unit, 7... Air supply fan, 8... Controller, 14... Gas supply unit , 18・・Heater, 20・・Inner case, 21・・Burner unit, 22・・Dark burner, 24・・Flame hole, 30・・Main body, 31・・Lid, 32・・Seal, 36・・Harness holding part, 37・・Convex part, 38・・Claw part, 39・・Harness, 40・・Gas distribution part, 41・・Ridge, 41a・・Inclined part, 42・・Nozzle, 43・・Medium Ridge, 43a...upper side inclined part, 44...first distribution part, 45...first passage part, 46...second distribution part, 47...second passage part, 48...gas inlet, 52...・Narrow portion, 53・・Opening portion, 55・・Rear side flow dividing projection, 56,73・・Left side surface, 57,74・・Bottom surface, 58・・Sloping surface, 59,72・・Lower left corner portion, 66 ..First bulge portion, 67..Second bulge portion, 69..Flat portion, 70..Rising portion, 71..Front side flow dividing projection, E1. Area, E3... No. 3 nozzle area, S... Mainstream.

Claims (2)

In the housing,
A burner unit in which a plurality of burners are arranged side by side in the left-right direction,
An inner case that houses the burner unit,
On the front surface of the inner case, a plurality of nozzles for supplying a fuel gas to each of the burners are arranged side by side in the left-right direction, and a plurality of distributors that divide the nozzles into a predetermined number and the lower part of each distributor. A water heater to which a gas distribution unit including a main body having a plurality of passages connected in an inclined shape and a lid mounted on the front surface of the main body and covering the distribution unit and the passages is attached. hand,
While a fuel gas inlet is formed at the lower end of each of the passage portions,
At least one of the distributors of the main body has an extension upper nozzle region located on an extension of the main flow of the combustion gas in the passage connected to the distribution unit and a non-extension upper nozzle region not located on the extension of the main flow. The nozzle area is arranged side by side in the left-right direction,
A bulging portion that bulges forward is formed in a portion that covers the passage portion and at least a portion of the non-extending upper nozzle region in the lid body, while a portion that covers the extending upper nozzle region is formed. A water heater having a non-bulging portion that does not bulge forward. A boundary portion between the bulging portion and the non-bulging portion corresponding to the passage portion and the extension upper nozzle region is formed in the left-right direction along a lower end of the extension upper nozzle region. The water heater according to claim 1.

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