JP2023071341A - Water heater - Google Patents

Abstract

To suppress resonance vibration caused by exhaust air while suppressing exhaust resistance, in a water heater.SOLUTION: An exhaust part 5 includes an outer wall part 32, an exhaust passage 100, and a partition part 50. In the exhaust passage 100, a flow passage is constituted where combustion exhaust is flowed from an introduction port 102 to an exhaust port 104 so as to strive over the inside and outside of the outer wall part 32. The partition part 50 includes a tabular partition wall 50A for partitioning a space in the outer wall part 32. At the partition wall 50A, a plurality of through-holes 58, and an opening part 54 whose opening region is larger than each through-hole 58 are provided. The opening part 54 and the exhaust passage 100 continue to each other so that combustion air passing through the opening part 54 flows in the flow passage inside the exhaust passage 100. An upper side region of the partition wall 50A in the outer wall part 32 is blocked by the outer wall part 32 and the exhaust passage 100.SELECTED DRAWING: Figure 5

Description

The present disclosure relates to water heaters.

Patent Literature 1 discloses an example of a gas appliance. The combustion apparatus disclosed in Patent Document 1 includes a combustion housing containing a burner, a fan for supplying combustion air to the combustion housing, a heat exchanger disposed above the combustion housing, and a heat exchanger above the heat exchanger. an exhaust hood positioned in the This combustion device has an exhaust restriction cylinder inserted from below the exhaust port, and has a structure aimed at reducing fan noise and Helmholtz-type resonance noise.

JP 2013-120014 A

In the water heater disclosed in Patent Document 1, the combustion exhaust discharged from the exhaust port always passes through either the plurality of ventilation holes or the exhaust restriction cylinder, so part of the combustion exhaust passes through the ventilation holes. There is concern about an increase in exhaust resistance due to passage.

An object of the present disclosure is to provide a technique for easily suppressing resonance vibration caused by exhaust gas while suppressing exhaust gas resistance in relation to a water heater.

A water heater, which is one of the present disclosure,
a combustion device for burning gas;
a heat exchanger supplied with flue gas generated by combustion in the combustion device;
an exhaust section that is a route for discharging the combustion exhaust that has passed through the heat exchanger to the outside;
A water heater having
The exhaust part
an outer wall portion having an inlet into which the combustion exhaust flows, at least a portion of which is disposed above the heat exchanger, and which defines a space through which the combustion exhaust passes;
An inlet arranged inside the outer wall and an outlet arranged outside and above the outer wall; an exhaust path configured with a flow path through which combustion exhaust gas flows;
a partition section having a plate-shaped partition wall that partitions the space in the outer wall section;
has
The partition wall is provided with a plurality of through holes and an opening having a larger opening area than each of the through holes,
the opening and the exhaust path continue such that the combustion exhaust passing through the opening flows through the flow path;
A region above the partition wall in the space within the outer wall portion is blocked by the outer wall portion and the exhaust passage, and an upper region of the plurality of through holes is outside a region downstream of the opening. It has a communicating structure

The technology according to the present disclosure makes it easy to suppress resonance vibration caused by exhaust while suppressing exhaust resistance in a water heater.

FIG. 1 is a front view illustrating the water heater according to the first embodiment. FIG. 2 is a front view illustrating a state in which the front cover is removed in the water heater of FIG. 1; FIG. 3 is a perspective view partially and schematically showing the vicinity of the exhaust part and the heat exchanger of the water heater of FIG. 1. FIG. FIG. 4 is an exploded perspective view partially and schematically showing the configuration around the exhaust portion and the heat exchanger of the water heater of FIG. 5 is a perspective cross-sectional view partially and schematically showing the vicinity of the exhaust part and the heat exchanger of the water heater of FIG. 1. FIG. 6 is an exploded perspective view of the configuration of FIG. 5. FIG. FIG. 7 is a perspective cross-sectional view partially showing the connection structure between the exhaust section and the heat exchanger.

Embodiments of the present disclosure are listed and illustrated below. The features [1] to [7] exemplified below may be combined in any way in a consistent combination.

[1] a combustion device for burning gas;
a heat exchanger supplied with flue gas generated by combustion in the combustion device;
an exhaust section that is a route for discharging the combustion exhaust that has passed through the heat exchanger to the outside;
A water heater having
The exhaust part
an outer wall portion having an inlet into which the combustion exhaust flows, at least a portion of which is disposed above the heat exchanger, and which defines a space through which the combustion exhaust passes;
An inlet arranged inside the outer wall and an outlet arranged outside and above the outer wall; an exhaust path configured with a flow path through which combustion exhaust gas flows;
a partition section having a plate-shaped partition wall that partitions the space in the outer wall section;
has
The partition wall is provided with a plurality of through holes and an opening having a larger opening area than each of the through holes,
the opening and the exhaust path continue such that the combustion exhaust passing through the opening flows through the flow path;
A region above the partition wall in the space within the outer wall portion is blocked by the outer wall portion and the exhaust passage, and an upper region of the plurality of through holes is outside a region downstream of the opening. A water heater with a communication structure.

The water heater according to [1] has a configuration in which a partition wall provided with a plurality of through holes partitions the space in the outer wall portion, and an upper region of the partition wall is closed by the outer wall portion and the exhaust path. The lower region continues to the exhaust channel. In other words, the upper region of the partition wall has a structure that does not allow the gas that has flowed into the inside to escape outside the upper region except for the through holes, and the lower region of the partition wall is separate from the plurality of through holes. It has a structure in which the exhaust flows into the exhaust path through the route. With such a structure, when the combustion exhaust gas is discharged from the exhaust passage, the plurality of through holes are less likely to obstruct the discharge, and the combustion exhaust gas is more easily discharged through the exhaust passage.
In particular, in the water heater, the gas storage portion is configured on the upper side of the partition wall so as to be blocked by the outer wall portion and the exhaust path, and the upper region of the plurality of through holes is outside the downstream region of the opening. Because of the communication structure, it is difficult for the gas that flows upward through the through-holes to flow directly into the exhaust path. A situation like this is likely to occur. With such a configuration, even if there is a structure in which there is concern about "resonant vibration" in the path for discharging the combustion exhaust gas from the heat exchanger through the exhaust path, the inflow and outflow of gas through each through hole is " It is likely to affect the establishment of "resonant vibration", and the resonant vibration is likely to be suppressed.

[2] The partition wall has a plate-like portion with one plate surface facing upward and the other plate surface facing downward,
The water heater according to [1], wherein each of the through-holes penetrates the plate-like portion between the one plate surface and the other plate surface.

In the water heater described in [2], it is possible to more easily realize a partition wall that facilitates adjustment of vibration.

[3] The partition part has a tubular part continuous with the partition wall so as to continue upward or downward from the partition wall, and the inner wall part of the tubular part is configured as the opening,
The exhaust path has a cylindrical body, and an inner peripheral portion of the cylindrical body is configured as the flow path,
The water heater according to [1] or [2], wherein the exhaust passage is fixed to the partition portion so that the cylindrical body and the cylindrical portion are fitted to each other.

Since the water heater described in [3] has a configuration in which the tubular portion provided so as to be continuous with the partition wall is fitted with the tubular body constituting the exhaust passage, the vicinity of the connection portion between the partition portion and the exhaust passage , the combustion exhaust tends to flow into the exhaust passage more smoothly.

[4] The tubular portion is continuous with the partition wall so as to rise upward from the partition wall,
The water heater according to [3], wherein the lower end of the cylindrical body is located above the lower end of the opening.

In the water heater described in [4], in addition to the configuration in which the cylindrical body and the cylindrical portion are fitted together, the lower end of the cylindrical body is positioned above the lower end of the opening, so that the combustion exhaust entering the opening is further reduced. It smoothly enters the cylindrical body. Therefore, exhaust resistance can be further suppressed.

[5] The partition wall includes a first partition wall and a pair of second partition walls arranged on both sides in the left-right direction of the first partition wall,
Each of the second partition walls is connected to the first partition wall at one end in the left-right direction,
The water heater according to any one of [1] to [4], wherein the lower surface of each of the second partition walls is arranged so as to become lower as it moves away from the first partition wall in the left-right direction.

The water heater described in [5] guides the combustion exhaust to the first partition side (that is, the introduction port side of the exhaust passage) by the pair of second partition walls while realizing the above-described function of the partition walls. be able to. Therefore, this water heater can discharge the combustion exhaust more smoothly.

[6] The water heater according to [5], wherein the through holes are provided in at least each of the second partition walls.

In the water heater described in [6], the pair of second partition walls can have both a function of guiding combustion exhaust gas toward the first partition wall and a function of suppressing vibration.

[7] The water heater according to [5], wherein the through hole is provided in both the first partition wall and the second partition wall.

In the water heater described in [7], the pair of second partition walls can have both a function of guiding combustion exhaust to the first partition wall side and a function of suppressing vibration, and furthermore, the first partition wall can also be added with a function of suppressing vibration.

<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 and the like are 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 fan 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 . A gas distribution unit 10 is arranged between the combustion device 3 and the front cover 2A. The fan 7 is arranged below the combustion device 3 inside the housing 2 .

In the example shown in FIG. 1 and the like, the vertical direction of the water heater 1 is the longitudinal direction of the water heater 1 when viewed from the front as shown in FIG. is. In the example of FIG. 1, the vertical direction of water heater 1 is the direction in which cylindrical body 106 extends. In the example of FIG. 1, the longitudinal direction (long side direction) of the rectangular front portion (front plate) of the front cover 2A is the vertical direction, and the short side direction (short side direction) of the front portion (front plate) is the vertical direction. ) is the left-right direction, and the direction perpendicular to the up-down direction and the left-right direction is the front-rear direction.

The combustion device 3 is a device that burns combustion gas supplied from the outside (specifically, fuel gas supplied via the gas distribution unit 10) to generate combustion exhaust gas. Combustion exhaust gas is high-temperature gas generated by combustion of combustion gas in the combustion device 3 . The combustion device 3 includes an inner case 3A, a burner unit (not shown), and the like. The inner case 3A is a rectangular box-shaped case that fits inside the housing 2 . In the inner case 3A, there is provided a burner unit group in which burner units, which are flat burners with high and low concentrations, are arranged side by side in the left-right direction. Each rich/lean burner (not shown) has a light side introduction port (not shown) and a rich side introduction port (not shown) which are open forward and into which fuel gas and primary air are introduced. It has a flame hole part consisting of thick flame holes on both left and right sides. A discharge electrode for ignition, a frame rod for flame detection, and the like are provided on the front upper portion of the inner case 3A.

The heat exchanger 4 includes a metal case 20 forming its outer shell, heat transfer tubes 22 ( FIG. 4 ) housed inside the case 20 , and a lower support member 80 . The heat exchanger 4 introduces the combustion exhaust gas from the combustion device 3 and passes through the inside thereof, and performs heat exchange between the combustion exhaust gas and the water flowing in the heat transfer pipes 22, thereby exchanging the water flowing in the heat transfer pipes 22. heat up. The combustion exhaust that has passed through the heat exchanger 4 is discharged to the exhaust section 5 . In the configuration of this embodiment, the case 20 of the heat exchanger 4 is configured in a box shape, and has a configuration in which the lower end and the upper end are open. 5 and 6, illustration of the heat transfer tubes 22 is omitted.

The exhaust part 5 is a part that guides the combustion exhaust discharged from the heat exchanger 4 upward and discharges it to the outside of the water heater 1 via the cylinder 106 . Details of the exhaust unit 5 will be described later.

The fan 7 is a fan that supplies combustion air. The fan 7 includes a driving portion having a motor, blades, etc., and a supply port for supplying combustion air, and the combustion air is sent from the supply port toward the combustion device 3 . A supply port of the fan 7 is fixed near the lower end of the combustion device 3 .

The water heater 1 shown in FIGS. 1 and 2 has a gas inlet 91 to which an external gas pipe is connected, a water inlet 92 to which a water pipe is connected, and a hot water outlet 93 on the lower side of the housing 2. be provided. The water inlet 92 is an inlet through which water is introduced from a water pipe provided outside the water heater 1 . Water introduced into the water inlet 92 is supplied to the heat transfer tube 22 ( FIG. 4 ) of the heat exchanger 4 through the water supply pipe 115 . A portion of the water supply pipe 115 is illustrated in FIG. The hot water outlet 93 is a hot water outlet for leading hot water to the outside of the water heater 1 . The hot water drawn out from the heat transfer pipe 22 of the heat exchanger 4 is discharged from the hot water outlet 93 through the hot water discharge pipe 116 connected to the downstream end of the heat transfer pipe 22 .

In water heater 1 shown in FIG. 2 , gas inlet 91 is an inlet through which gas is introduced from a gas pipe provided outside water heater 1 . The gas introduced into the gas inlet 91 is supplied to the gas distribution unit 10 via a gas supply section (not shown) having a main valve, a proportional valve, and the like. The gas supplied to the gas distribution unit 10 is distributed so as to pass through a plurality of holes (not shown) provided in the combustion device 3 and supplied to the combustion device 3 via these holes. The combustion device 3 burns gas (fuel gas) supplied into the combustion device 3 via the gas distribution unit 10 . Exhaust gas (combustion exhaust gas) generated by combustion of gas in the combustion device 3 is emitted upward from the combustion device 3 and flows into the heat exchanger 4 from the opening at the lower end of the heat exchanger 4, where the heat exchanger 4 It flows into the exhaust part 5 through the inside. The combustion exhaust that has flowed from the heat exchanger 4 to the exhaust portion 5 side is introduced into the exhaust portion 5 from the lower end portion of the exhaust portion 5 and discharged from the exhaust portion 5 to the outside (outside the water heater 1).

2. Details of Heat Exchanger The following description relates to details of the heat exchanger 4 in the water heater 1 .
As shown in FIG. 4, the heat exchanger 4 to which the exhaust part 5 is fixed has an open upper side so that an opening 20A is provided at the upper end. The case 20 of the heat exchanger 4 is, for example, a metal case made of a metal material. The case 20 includes a front wall portion 23, a rear wall portion 24, and a pair of side wall portions 25 and 26. The front wall portion 23, the rear wall portion 24, and the pair of side wall portions 25 and 26 are annularly connected. Eggplant. Both the front wall portion 23 and the rear wall portion 24 are provided so as to extend in the left-right direction with the front-rear direction as the plate thickness direction, and are arranged facing each other in the front-rear direction. Both of the pair of side wall portions 25 and 26 are provided so as to extend in the front-rear direction with the left-right direction as the plate thickness direction, and are arranged facing each other in the left-right direction. The upper end portions of the front wall portion 23, the rear wall portion 24, and the pair of side wall portions 25 and 26 form the opening portion 20A.

An upper end portion of the case 20 is provided with a projecting portion 20B configured in a flange shape so as to project outward. The projecting portion 20B includes a front projecting portion 23A, a rear projecting portion 24A, and side projecting portions 25A and 26A. The front projecting portion 23</b>A is provided so as to bend forward from the upper end of the front wall portion 23 and protrude forward from the front wall portion 23 . The rear projecting portion 24</b>A is provided so as to bend rearward from the upper end of the rear wall portion 24 and protrudes rearward from the rear wall portion 24 . The side protruding portion 25A is provided so as to bend from the upper end of the side wall portion 25 to one side in the left-right direction (left side in front view), and protrudes from the side wall portion 25 to one side in the left-right direction (left side in front view). The side protruding portion 26A is provided so as to bend from the upper end of the side wall portion 26 to the other side in the left-right direction (right side in front view), and protrudes from the side wall portion 26 to the other side in the left-right direction (right side in front view).

3. Details of Exhaust Portion The following description relates to details of the exhaust portion 5 in the water heater 1 .
The exhaust part 5 shown in FIGS. 2 and 3 is a device that forms a path for introducing the combustion exhaust that has passed through the heat exchanger 4 inside and discharging it to the outside. The exhaust part 5 is fixed to the upper end of the heat exchanger 4 and arranged above the heat exchanger 4 . As shown in FIGS. 4 and 6 , the exhaust section 5 mainly includes a case 30 , a partition section 50 and a packing 70 .

The case 30 shown in FIG. 3 is, for example, a metal case made of a metal material. The case 30 is fixed to the upper end of the heat exchanger 4 and arranged above the heat exchanger 4 so as to cover the heat exchanger 4 . The case 30 has an outer wall portion 32 and a fixing portion 34 . The outer wall portion 32 includes a peripheral wall portion 35 that surrounds both the front and rear sides and the left and right sides of the space where the combustion exhaust gas is discharged from the heat exchanger 4, and the upper wall portion 37 that is continuous with the upper side of the peripheral wall portion 35. be done. As shown in FIG. 3, the peripheral wall portion 35 includes a front wall portion 35A, a rear wall portion 35B, and side wall portions 35C and 35D, which are integrally connected to surround the space inside the case 30 on the front, rear, left, and right. The front wall portion 35A, the rear wall portion 35B, and the side wall portions 35C and 35D are all provided so as to rise upward from the annular fixing portion 34, and the upper wall portion 37 is connected to the upper end portion of each. The fixed portion 34 extends outward (specifically, on both front and rear sides and on both left and right sides) in an annular shape from the lower end portion of the peripheral wall portion 35 and has a flange shape. As shown in FIG. 5, the fixed part 34 is arranged on the protruding part 20B of the heat exchanger 4 and fixed to the protruding part 20B with the packing 70 interposed therebetween (see also FIG. 7). In the example of FIG. 3, the fixed portion 34 and the projecting portion 20B are fixed by a crimping process that bends the crimped portion 34Z provided on the fixed portion 34. In the example shown in FIG. 4 shows a state in which the crimped portion 34Z is not bent, and FIG. 3 shows a fixed state after the crimped portion 34Z is bent.

As shown in FIG. 3, the upper wall portion 37 of the case 30 includes a first upper wall portion 37Z covering the upper side of the first partition wall 51 and second upper wall portions arranged on both left and right sides of the first upper wall portion 37Z. 37A and 37B. The first upper wall portion 37Z and the second upper wall portions 37A and 37B are both plate-shaped. The first upper wall portion 37Z is provided in an arrangement in which the plate thickness direction is the vertical direction. As shown in FIGS. 4 and 6, the first upper wall portion 37Z is provided with an opening 39 penetrating through the first upper wall portion 37Z. An exhaust path 100 is inserted through the opening 39 . Specifically, a tubular portion 38 is provided so as to rise upward from the first upper wall portion 37Z, and the inner peripheral portion of the tubular portion 38 is an opening 39. As shown in FIG. As shown in FIG. 3, the exhaust path 100 and the tubular portion 38 are in close contact so that the tubular portion 38 and the tubular body 106 are fitted.

As shown in FIG. 5, the second upper wall portion 37A is arranged to cover the upper side of the second partition wall 52A. The second upper wall portion 37A is arranged to be inclined along the second partition wall 52A, and the lower surface of the second upper wall portion 37A is positioned downward as it moves away from the first upper wall portion 37Z in the left-right direction. Inclined. The second upper wall portion 37B is arranged to cover the upper side of the second partition wall 52B. The second upper wall portion 37B is arranged to be inclined along the second partition wall 52B, and the lower surface of the second upper wall portion 37B is positioned downward as it moves away from the first upper wall portion 37Z in the left-right direction. Inclined.

The case 30 configured in this way is arranged entirely above the heat exchanger 4 and has a space inside itself through which combustion exhaust gas passes. In the case 30 , an opening provided at the lower end of the outer wall portion 32 is an inlet 42 , and the inlet 42 is an inlet through which the combustion exhaust that has passed through the heat exchanger 4 flows. The inlet 42 communicates with the opening 20A of the heat exchanger 4, and the gas discharged upward from the heat exchanger 4 through the opening 20A flows through the inlet 42 into the case 30 (specifically, inside the outer wall portion 32).

The exhaust passage 100 shown in FIGS. 3 and 4 is a component for discharging the combustion exhaust that has entered the case 30 to the outside of the case 30, and is for discharging the combustion exhaust to the outside of the water heater 1. is the route. As shown in FIG. 5 , the exhaust path 100 includes an inlet 102 arranged inside the outer wall 32 and an outlet 104 arranged outside and above the outer wall 32 . The exhaust path 100 forms a flow path through which the combustion exhaust flows from the inlet 102 to the outlet 104 so as to straddle the inside and outside of the outer wall portion 32 .

As shown in FIG. 4, the exhaust path 100 includes a cylindrical body 106 configured in a cylindrical shape. A flow path is formed inside the cylinder 106 for flowing combustion exhaust gas. The inner wall portion of the cylindrical body 106 functions as the flow path. In the examples of FIGS. 3 and 4, the cylinder 106 has a cylindrical shape. The cylindrical body 106 has a plurality of cylindrical portions 106A, 106B, 106C configured as cylinders centered on a predetermined central axis. The central axis is, for example, a vertical axis. The inner and outer peripheral surfaces of the cylindrical portions 106A, 106B, 106C are cylindrical surfaces centered on the central axis. A plurality of cylindrical portions 106A, 106B, and 106C are integrally configured in a form that is vertically connected.

As shown in FIG. 5, the introduction port 102 is an opening provided at the lower end of the cylinder 106 . The introduction port 102 is an inlet for introducing gas present in the space outside the cylinder 106 inside the outer wall portion 32 into the cylinder 106 . The discharge port 104 is an opening provided at the upper end of the cylindrical body 106 . The discharge port 104 is an outlet for discharging the gas inside the cylindrical body 106 to the outside of the water heater 1 . The cylindrical body 106 has a configuration in which at least a part of the upper end side is exposed to the outside of the housing 2 (FIG. 1). Specifically, the outlet 104 and the vicinity of the outlet 104 are exposed to the space outside the water heater 1 . Because of this configuration, the combustion exhaust gas flowing upward through the cylinder 106 is discharged to the outside of the water heater 1 through the discharge port 104 .

The backwind suppression mechanism 90 shown in FIG. 5 is a mechanism that suppresses gas from flowing back to the housing 2 side in the cylindrical body 106 (specifically, gas flowing from the discharge port 104 side to the introduction port 102 side). is. The headwind suppression mechanism 90 is provided inside the cylinder 106 . The headwind suppression mechanism 90 mainly includes a mounting member 110 and a flap 120 . The mounting member 110 is a member mounted inside the cylinder 106 . Mounting member 110 rotatably supports flap 120 . The flap 120 has a plate-like shape as a whole, and is displaced between a closed position that closes a predetermined position in the cylindrical body 106 and an open position that opens the predetermined position more than the closed position. When the gas flows from the discharge port 104 side to the introduction port 102 side, the flap 120 is displaced to the closed position, and when the gas flows from the introduction port 102 side to the discharge port 104 side, the flap 120 is moved to the open position (Fig. 5).

As shown in FIG. 5, the partition portion 50 is a portion that vertically partitions the space inside the outer wall portion 32 . The partition part 50 includes a plate-like partition wall 50A that partitions the space inside the outer wall part 32 . The partition wall 50A is provided with a plurality of through holes 58 and an opening 54 having an opening area larger than that of each through hole 58 (see also FIGS. 4 and 6). In the configuration of FIG. 5 , a region of the space inside the outer wall portion 32 above the partition wall 50A is blocked by the outer wall portion 32 and the exhaust path 100 .

As shown in FIG. 5, the partition wall 50A has a plate-like portion 60 with one plate surface 60A (upper surface) facing upward and the other plate surface (lower surface) facing downward. The plate-shaped portion 60 includes a plate-shaped portion that forms the first partition wall 51 and plate-shaped portions that form the second partition walls 52A and 52B. Each through-hole 58 penetrates the plate-like portion 60 between one plate surface 60A and the other plate surface (lower surface).

The partition part 50 has a cylindrical part 56 that continues to the partition wall 50A so as to continue upward or downward from the partition wall 50A. The tubular portion 56 is configured as a cylinder. The central axis of the cylinder of the tubular portion 56 coincides with the central axis of the cylinder of the tubular body 106 . An inner wall portion of the cylindrical portion 56 is configured as the opening portion 54 . The cylindrical portion 56 is continuous with the partition wall 50A so as to rise upward from the partition wall 50A. As shown in FIG. 5 , the tubular portion 56 and the tubular body 106 are fitted so as to be fitted into the tubular portion 56 from the outside, and the exhaust passage 100 is fixed to the partition portion 50 . The lower end of the cylindrical body 106 is located above the lower end of the opening 54 . With such a configuration, the opening 54 and the exhaust path 100 are continued so that the combustion exhaust passing through the opening 54 flows through the flow path in the exhaust path 100 .

As shown in FIGS. 4 and 5, the partition wall 50A includes a first partition wall 51 and a pair of second partition walls 52A and 52B arranged on both sides of the first partition wall 51 in the left-right direction. Each of the second partition walls 52A and 52B is connected to the first partition wall 51 at one end in the left-right direction. The lower surface of each of the second partition walls 52A and 52B is arranged so as to become lower as it moves away from the first partition wall 51 in the left-right direction. The second partition wall 52A arranged on one side in the left-right direction is configured so that one side in the left-right direction is lowered (specifically, left slanted in a downward configuration). The second partition wall 52B arranged on the other side in the left-right direction is configured such that the other side in the left-right direction is lowered (specifically, the right slanted in a downward configuration).

In such a partition wall 50A, through holes 58 are provided in at least each of the second partition walls 52A and 52B. In the examples of FIGS. 4 to 6, through holes 58 are provided in both the first partition wall 51 and the second partition walls 52A and 52B. Specifically, a plurality of rows (specifically, three rows) of through holes 58 arranged in the left-right direction are provided so as to straddle the second partition wall 52A and the first partition wall 51 . In each row of through holes 58, the through holes 58 are arranged at regular intervals. Similarly, a plurality of rows (specifically, three rows) of through holes 58 arranged in the left-right direction are provided so as to straddle the second partition wall 52</b>B and the first partition wall 51 . In each row of through holes 58, the through holes 58 are arranged at regular intervals.

3. Example of Effect As shown in FIG. The lower region of the partition wall 50A continues to the exhaust path 100 in a configuration blocked by . In other words, the upper region of the partition wall 50A has a structure that does not allow the gas that has flowed into the interior to escape outside the upper region from locations other than the through holes 58, and the lower region of the partition wall 50A has a plurality of through holes. The structure is such that the exhaust flows into the exhaust passage 100 through a route different from that of 58 . With such a structure, when the combustion exhaust gas is discharged from the exhaust passage 100 , the plurality of through holes 58 are less likely to hinder the discharge, and the combustion exhaust gas is more easily discharged through the exhaust passage 100 . In particular, in the water heater 1, the gas storage portion is configured on the upper side of the partition wall 50A so as to be blocked by the outer wall portion 32 and the exhaust path 100, and the upper regions of the plurality of through holes 58 are on the downstream side of the opening portion 54. Since the non-communication structure is outside the region, it is difficult for the gas that has passed through the plurality of through holes 58 to flow upward to flow into the exhaust path 100 as it is. A state in which gas enters and exits without accompanying is likely to occur. With such a configuration, even if there is a structure in which there is concern about "resonant vibration" in the path for discharging the combustion exhaust gas from the heat exchanger 4 via the exhaust path 100, gas flow through each through hole 58 Entering and exiting easily affects establishment of "resonant vibration", and resonance vibration is easily suppressed.

In the water heater 1 configured in this way, when the gas flows into the upper region of the through hole 58 through the through hole 58, the internal pressure of the upper region, especially the internal pressure near the through hole 58 increases. When this internal pressure becomes higher than the inflow pressure of the gas, the gas near the through hole 58 in the upper region overcomes the inflow pressure and is pushed back to the lower region of the through hole 58 . When the gas is pushed back to the lower region of the through hole 58, the internal pressure near the through hole 58 in the upper region becomes lower. A portion overcomes the internal pressure and flows into the upper region through the through holes 58 . As a result of repeated entry and exit of the gas through the through-hole 58 in this way, a spring-like action (a sudden increase in the internal pressure of the lower region is reduced so as to be absorbed by the upper region, and then the pressure from the upper region to the lower region is reduced). As the internal pressure of the lower region is increased again by returning to Therefore, resonance vibration in the exhaust portion 5 is suppressed. Moreover, in the partition wall 50A, the plurality of through holes 58 are dispersed over a wide range so as to extend from a position near one end in the left-right direction to a position near the other end in the left-right direction in the space inside the outer wall 32. Since they are dispersed over a wide range from a position near the front end to a position near the rear end of the space within the outer wall portion 32 , the suppression effect can be easily obtained over a wide range within the space within the outer wall portion 32 .

The height of the first partition wall 51 from the upper end of the heat exchanger 4 when the upper end of the heat exchanger 4 is the reference position is 30% or more of the maximum height (height of the highest portion) of the outer wall portion 32. It is desirable that If it is lower than this, the exhaust resistance tends to increase, but if it is within the above range, it is easy to suppress the increase in the exhaust resistance. On the other hand, when the upper end of the heat exchanger 4 is taken as a reference position, the height of the first partition wall 51 from the upper end is 70% or less of the maximum height (height of the highest portion) of the outer wall portion 32. It is desirable that If it is higher than this, there is a concern that the resonance frequency f' will be significantly different from the frequency to be attenuated, and the effect of suppressing resonance vibration will be reduced.

In addition, the area of the opening region at the lower end of each of the plurality of through holes 58 is smaller than the area of the opening region at the lower end of the opening 45 . The opening area of the lower end of the through-hole 58 is the inner area of the inner peripheral edge of the lower end of the through-hole 58 . The opening area of the lower end of the opening 45 is the inner area of the inner peripheral edge of the lower end of the opening 45 . The area of the opening region at the lower end of each of the plurality of through-holes 58 is preferably 30% or less of the area of the opening region at the lower end of the opening 45, and is 10% or less. is more desirable, and a size of 5% or less is particularly desirable. However, the area of the opening region at the lower end of each of the plurality of through holes 58 is preferably 0.05% or more of the area of the opening region at the lower end of the opening 45, and is 0.1% or more. is more desirable. It is desirable that the total area of the opening regions at the lower ends of the plurality of through holes 58 is smaller than the area of the opening regions at the lower ends of the openings 45 . It is desirable that each through-hole 58 has a size such that a flow from the lower side to the upper side and a flow from the upper side to the lower side do not occur simultaneously in one through-hole 58 .

In the water heater 1, the partition wall 50A has a plate-like portion 60 with one plate surface 60A facing upward and the other plate surface facing downward. Each through-hole 58 penetrates the plate-like portion 60 between one plate surface 60A and the other plate surface. This water heater 1 can more easily realize the partition wall 50A that easily suppresses vibration.

Since the water heater 1 has a configuration in which the tubular portion 56 provided so as to be continuous with the partition wall 50A is fitted with the tubular body 106 forming the exhaust passage 100, the connecting portion between the partition portion 50 and the exhaust passage 100 In the vicinity, the combustion exhaust tends to flow into the exhaust passage 100 more smoothly.

In water heater 1, in addition to the configuration in which cylindrical body 106 and cylindrical portion 56 are fitted together, the lower end of cylindrical body 106 is positioned above the lower end of opening 54, so that the combustion exhaust entering opening 54 is further reduced. It smoothly enters into the cylindrical body 106 . Therefore, exhaust resistance can be further suppressed.

The water heater 1 realizes the above-described function of the partition wall 50A, and directs the combustion exhaust to the first partition wall 51 side (that is, the introduction port 102 side of the exhaust passage 100) by the pair of second partition walls 52A and 52B. can guide you. Therefore, the water heater 1 can discharge the combustion exhaust more smoothly.

In the water heater 1, the pair of second partition walls 52A and 52B can serve both the function of guiding the combustion exhaust to the first partition wall 51 side and the function of suppressing vibration. can also be added with a function of suppressing vibration.

<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 embodiments described above, the entire outer wall 32 is arranged above the heat exchanger 4 , but only part of the outer wall is arranged above the heat exchanger 4 , the other part is above the heat exchanger 4 . It does not have to be placed above the

In the above-described embodiment, the lower end of the exhaust passage 100 is fixed to the partition wall 50A, and the lower end of the exhaust passage 100 is positioned above the lower end of the opening 54 . The exhaust path 100 may be inserted through the opening 54 so as to be positioned below the lower end of the .

In the above-described embodiment, the tubular body 106 is configured in a cylindrical shape, but the tubular body may have any tubular shape, for example, a rectangular tubular shape.

In the above-described embodiment, both the first partition wall 51 and the second partition walls 52A and 52B are provided with the through holes 58. However, even if the first partition wall 51 is not provided with the through holes 58, good.

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.

1: Water heater 2: Housing 3: Combustion device 4: Heat exchanger 5: Exhaust part 32: Outer wall part 38: Cylindrical part 39: Opening part 42: Inlet 50A: Partition wall 51: First partition wall 52A: Second partition wall 52B: Second partition wall 54: Opening 56: Cylindrical portion 58: Through hole 60: Plate-like portion 60A: Plate surface 100: Exhaust passage 102: Inlet 104: Outlet 106: Cylindrical body

Claims (7)

a combustion device for burning gas;
a heat exchanger supplied with flue gas generated by combustion in the combustion device;
an exhaust section that is a route for discharging the combustion exhaust that has passed through the heat exchanger to the outside;
A water heater having
The exhaust part
an outer wall portion having an inlet into which the combustion exhaust flows, at least a portion of which is disposed above the heat exchanger, and which defines a space through which the combustion exhaust passes;
An inlet arranged inside the outer wall and an outlet arranged outside and above the outer wall; an exhaust path configured with a flow path through which combustion exhaust gas flows;
a partition section having a plate-shaped partition wall that partitions the space in the outer wall section;
has
The partition wall is provided with a plurality of through holes and an opening having a larger opening area than each of the through holes,
the opening and the exhaust path continue such that the combustion exhaust passing through the opening flows through the flow path;
A region above the partition wall in the space within the outer wall portion is blocked by the outer wall portion and the exhaust passage, and an upper region of the plurality of through holes is outside a region downstream of the opening. A water heater with a communication structure. The partition wall has a plate-like portion with one plate surface facing upward and the other plate surface facing downward,
The water heater according to claim 1, wherein each of the through-holes penetrates the plate-like portion between the one plate surface and the other plate surface. The partition part has a tubular part continuous with the partition wall so as to continue upward or downward from the partition wall, and the inner wall part of the tubular part is configured as the opening,
The exhaust path has a cylindrical body, and an inner peripheral portion of the cylindrical body is configured as the flow path,
The water heater according to claim 1 or 2, wherein the exhaust passage is fixed to the partition portion so that the tubular body and the tubular portion are fitted. The cylindrical portion is continuous with the partition wall in a configuration that rises upward from the partition wall,
4. The water heater according to claim 3, wherein a lower end of said cylindrical body is located above a lower end of said opening. The partition wall includes a first partition wall and a pair of second partition walls arranged on both sides in the left-right direction of the first partition wall,
Each of the second partition walls is connected to the first partition wall at one end in the left-right direction,
The water heater according to any one of claims 1 to 4, wherein the lower surface of each of the second partition walls is arranged so as to become lower as it moves away from the first partition wall in the left-right direction. The water heater according to claim 5, wherein the through hole is provided in at least each of the second partition walls. The water heater according to claim 5, wherein the through hole is provided in both the first partition wall and the second partition wall.

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