JP7315208B2 - Water heater - Google Patents

Description

The present disclosure relates to water heaters.

2. Description of the Related Art Conventionally, water heaters are known in which a secondary heat exchanger for recovering latent heat is provided above a primary heat exchanger for recovering sensible heat. A drain outlet connected to a rubber drain hose protrudes downward from the bottom surface of the front part of the secondary heat exchanger, and discharges drain generated with latent heat recovery toward the neutralizer. In recent years, for the purpose of weight reduction and cost reduction, a technique has been disclosed in which a primary heat exchanger in which two primary heat exchangers for hot water supply and circulation heating (for example, for bathing) are arranged side by side in a shared container via a partition, and a secondary heat exchanger in which two secondary heat exchangers are arranged in a shared container (see, for example, Patent Document 1).

JP 2016-114354 A

From the standpoint of ease of attachment, the drain hose is preferably arranged by extending downward as it is from the drain outlet projecting downward. However, in the latent heat recovery type water heater as in Patent Document 1, if the drain hose is arranged downward from the drain outlet as it is, the drain hose passes through the primary heat exchanger below the secondary heat exchanger and the front side of the can body of the combustion chamber. As a result, the drain hose may come into contact with the hot can body and be damaged. In order to avoid contact with the can body, it is conceivable to bend the drain hose to the side near the drain outlet, but in this case, there is a concern that the mountability will be sacrificed.

Therefore, in order to solve at least one of the above-described problems, a water heater is provided that can achieve both good attachability of the drain hose and suppression of breakage.

A water heater according to one aspect of the present disclosure includes
A primary heat exchange device having a can whose interior is partitioned left and right by a partition, and two primary heat exchangers arranged adjacent to each other in the left and right direction with the partition interposed in the can, and recovering sensible heat of combustion exhaust gas;
a secondary heat exchange device disposed above the primary heat exchange device and formed with a drain outlet for recovering the latent heat of the combustion exhaust gas and for discharging drain generated as the latent heat is recovered;
a drain hose connected to the drain outlet and guiding the drain discharged from the drain outlet;
A water heater comprising
The secondary heat exchange device is arranged in such a manner that a front end thereof protrudes forward from the front surface of the can body,
The drain outlet is formed below the front end portion and at a position corresponding to the partition portion in the left-right direction.

According to the water heater of the aspect described above, it is possible to achieve both good attachability of the drain hose and suppression of damage.

FIG. 1 is a front view schematically illustrating the internal structure of the water heater according to the first embodiment. FIG. 2 is an explanatory diagram conceptually illustrating the configuration of the water heater. FIG. 3 is a partially enlarged perspective view schematically illustrating the internal structure of the water heater according to the first embodiment. FIG. 4 is a partially enlarged perspective view schematically illustrating the internal structure of the water heater according to the first embodiment. FIG. 5 is a partially enlarged cross-sectional view taken along line AA (cutting position along line AA) in FIG. FIG. 6 is a partially enlarged cross-sectional view taken along line BB (cutting position BB) of FIG. FIG. 7 is a partially enlarged cross-sectional view showing a main part taken along line CC (cutting position CC) of FIG. FIG. 8 is a partially enlarged cross-sectional view taken along line DD (cutting position DD) of FIG. FIG. 9 is a partially enlarged perspective view schematically showing the winding form of the resin film in the water heater according to the first embodiment.

Hereinafter, embodiments of the present disclosure will be listed and exemplified.

In the water heater of the present disclosure, if the drain outlet of the secondary heat exchange device is formed at a position corresponding to the partition portion of the primary heat exchange device, it becomes easier to employ a configuration in which the drain hose is directly extended downward from the drain outlet. By adopting such a configuration, the drain hose can be extended along the partition of the primary heat exchange device. The partition is positioned between the left and right heat exchangers through which the combustion exhaust passes, and is a relatively low temperature portion of the primary heat exchange device. Therefore, even if the drain hose is flexed and comes into contact with the can body, damage to the drain hose can be suppressed as compared with the case where the drain hose comes into contact with and comes close to the part corresponding to the heat exchanger of the can body. Further, when the drain hose is arranged to extend straight downward, the attachment of the drain hose to the drain outlet is also improved. Furthermore, when the drain hose is arranged extending downward, the space on both sides of the drain hose in the primary heat exchange device can be effectively utilized.

The water heater of the present disclosure may include a resin film provided with a conductor. Further, the resin films may be arranged on both the front and rear sides and the left and right sides of the primary heat exchange device so as to surround the primary heat exchange device. The drain hose may extend downward from the drain outlet side so as to pass through the outside of the resin film. In this water heater, even when the drain hose is flexed or displaced in a direction approaching the can body, the resin film arranged inside the drain hose can suppress or prevent the drain hose from coming into contact with the can body.

Each primary heat exchanger is configured in a meandering manner by a plurality of heat transfer tubes extending in the longitudinal direction sequentially arranged from a side closer to the partition to a side farther from the partition, and a plurality of connection tubes connecting ends of the plurality of heat transfer tubes to each other, so that the front end of the heat transfer tube closest to the partition among the plurality of heat transfer tubes is connected in series to the rear end of the heat transfer tube farthest from the partition. An introduction pipe for introducing hot water may be connected to the front ends of adjacent heat transfer tubes. In this case, even if the drain hose is bent in the left-right direction, it will come into contact with the introduction pipe through which hot water before heating flows, that is, contact with the introduction pipe with a lower temperature. Therefore, damage to the drain hose due to heat can be suppressed as compared with the case of direct contact with the can body or the case of contact with piping through which hot water after heating flows.

<First Embodiment>
A first embodiment will be described below with reference to the drawings.
As shown in FIGS. 1 to 5, the water heater 1 includes a primary heat exchange device 100, a secondary heat exchange device 200, a burner device 300, and an exhaust hood 400. FIG. The primary heat exchange device 100 includes two heat exchangers, a hot water supply primary heat exchanger 110 and a bath primary heat exchanger 120 . The secondary heat exchange device 200 is arranged above the primary heat exchange device 100 . The secondary heat exchange device 200 includes two heat exchangers, a hot water supply secondary heat exchanger 210 connected to the upstream side of the hot water supply primary heat exchanger 110, and a bath secondary heat exchanger 220 connected to the upstream side of the bath primary heat exchanger 120. The burner device 300 is connected to the lower portion of the primary heat exchange device 100 . The burner device 300 includes two burner groups, a hot water supply burner group 310 and a bath burner group 320 , and a burner case 330 . Two burner groups are provided: a hot water supply burner group 310 that generates combustion exhaust gas to be sent to the hot water supply primary heat exchanger 110 and the hot water supply secondary heat exchanger 210, and a bath burner group 320 that generates combustion exhaust gas to be sent to the bath primary heat exchanger 120 and the bath secondary heat exchanger 220. The exhaust hood 400 has a lower end connected to the primary heat exchange device 100 and an upper end connected to the secondary heat exchange device 200 . The exhaust hood 400 opens downward at its lower end and communicates with the space inside the primary heat exchange device 100 . In addition, the exhaust hood 400 is open forward at its upper end and communicates with the space inside the secondary heat exchange device 200 .

Water heater 1 circulates combustion exhaust gas generated by burner groups 310 and 320 of burner device 300 to primary heat exchange device 100 above burner device 300 . In the primary heat exchange device 100, heat is exchanged between the water passing through the hot water supply primary heat exchanger 110 and the bath primary heat exchanger 120 and the combustion exhaust gas. The water heater 1 functions to recover the sensible heat of the combustion exhaust by means of the primary heat exchange device 100 . As shown in FIG. 5 , in water heater 1 , combustion exhaust from burner device 300 is led from primary heat exchange device 100 to secondary heat exchange device 200 via exhaust hood 400 . The combustion exhaust that has passed through the primary heat exchange device 100 enters the secondary heat exchange device 200 from behind through the exhaust hood 400 . In the secondary heat exchange device 200, heat is exchanged between the flow of water in the hot water supply secondary heat exchanger 210 and the bath secondary heat exchanger 220 and the combustion exhaust gas. The water heater 1 functions to recover the latent heat of the combustion exhaust by means of the secondary heat exchange device 200 .

As shown in FIG. 2, the water heater 1 is configured with two circuits, a hot water supply circuit 10 and a bath circuit 20, in terms of circuit configuration. The hot water supply circuit 10 is a circuit for heating water from a tap or the like and causing it to flow out as hot water. As shown in FIGS. 1 and 2, the hot water supply circuit 10 allows water to flow from a water inlet 11 connected to a water supply source such as tap water into a water inlet pipe 12, heat the water by exchanging heat with the combustion exhaust gas from the hot water supply burner group 310 while passing the water through a hot water supply secondary heat exchanger 210 and a hot water supply primary heat exchanger 110 in that order, and allows hot water to flow out from a hot water outlet 14 through a hot water outlet 13 (exemplified as a connection pipe according to the present invention). . The bath circuit 20 is a circuit for circulating and heating hot water in a bathtub B (exemplified as an external device according to the present invention). The bath circuit 20 sucks the hot water in the bathtub B into a return pipe 22 from a hot water inlet 21 communicating with an opening in the bathtub B by a circulation pump P, passes the water through a bath secondary heat exchanger 220 and a bath primary heat exchanger 120 in order, exchanges heat with the combustion exhaust of a bath burner group 320, reheats the hot water, and discharges hot water of higher temperature from a hot water outlet 24 to the bathtub B through a forward pipe 23. - 特許庁

Moreover, as shown in FIGS. 1 and 2, the water heater 1 includes a drain hose 31 and a neutralizer 32 . For the drain hose 31, for example, a heat-resistant and flexible material such as heat-resistant rubber may be molded into a predetermined shape. The drain hose 31 is connected to a later-described drain outlet 238 (see FIG. 5) of the secondary heat exchange device 200 on the upstream side, and is connected to the neutralizer 32 on the downstream side. Drainage generated by recovery of latent heat in the secondary heat exchange device 200 is discharged to the outside of the secondary heat exchange device 200 through the drain outlet 238 and sent to the neutralizer 32 through the drain hose 31 . The neutralizer 32 is filled with a neutralizing agent such as calcium carbonate, and neutralizes it by circulating acid drain.

Further, as shown in FIG. 1, the water heater 1 includes a controller 33 as a control device. The controller 33 is configured, for example, as a known microcomputer or the like, is configured to be able to acquire signals from various sensors provided in the water heater 1, and is configured to be able to control various actuators provided in the water heater 1. For example, the water heater 1 operates the hot water supply burner group 310 to generate hot water when a water flow sensor (not shown) detects water flow in the water inlet pipe 12 . As another example, the water heater 1 operates the bath burner group 320 to reheat the bath when a water sensor (not shown) detects the passage of water in the return pipe 22 .

Next, the configuration of the primary heat exchange device 100 will be described.
The primary heat exchange device 100 is a sensible heat recovery type heat exchange device. As shown in FIGS. 3 to 8, the primary heat exchange device 100 includes a can body 130, a hot water supply primary heat exchanger 110, and a bath primary heat exchanger 120. As shown in FIGS. The can body 130, the hot water supply primary heat exchanger 110, and the bath primary heat exchanger 120 may be made of, for example, copper, which has excellent thermal conductivity. As shown in FIG. 6, the can body 130 has a substantially rectangular shape in a plan view that is elongated in the left-right direction, and is formed in a rectangular tubular shape penetrating vertically. As shown in FIGS. 6 and 8 , the interior of the can body 130 is partitioned into left and right by a partition portion 131 . The hot water supply primary heat exchanger 110 and the bath primary heat exchanger 120 are arranged side by side in the horizontal direction in the can body 130 via the partition portion 131 . In other words, the hot water supply primary heat exchanger 110 is housed in the right space partitioned by the partition portion 131 in the can body 130, and the bath primary heat exchanger 120 is housed in the left space partitioned by the partition portion 131 in the can body 130.

As shown in FIG. 6 , the can body 130 has a front wall portion 132 , a rear wall portion 133 , a left wall portion 134 and a right wall portion 135 . As shown in FIGS. 7 and 8, the upper and lower open ends of the can body 130 are provided with brim portions 136 formed to extend outward in the shape of brim. As shown in FIG. 7, the primary heat exchange device 100 is fixed in the vertical direction by crimping the upper and lower collar portions 136 by crimping portions 334 and 404 provided on the exhaust hood 400 and the burner case 330 . As shown in FIG. 6, the can body 130 has a partition portion 131 spanning between a front wall portion 132 and a rear wall portion 133 at a position to the left of the center in the left-right direction, and both ends of the partition portion 131 in the front-rear direction are connected to the front wall portion 132 and the rear wall portion 133, respectively. That is, the left and right spaces partitioned by the partition part 131 are larger on the left side and smaller on the right side.

As shown in FIGS. 5 to 8, the primary heat exchanger 110 for hot water supply includes a plurality of heat transfer tubes 111 and a plurality of connection tubes 112 connecting them. The heat transfer tube 111 is a straight tube with a circular cross section. A plurality of heat transfer tubes 111 (in this embodiment, an odd number of seven) are provided. Each heat transfer tube 111 is arranged so as to extend forward and backward so that both ends thereof penetrate through the front wall portion 132 and the rear wall portion 133 of the can body 130 . Each heat transfer tube 111 is fixed to a penetrating portion of the can body 130 by brazing or the like. Each heat transfer tube 111 is arranged in the vertical center of the can body 130 . The heat transfer tubes 111 are arranged in a single stage along the left-right direction from the partition portion 131 toward the right wall portion 135 . In the plurality of heat transfer tubes 111, the rear end of the heat transfer tube 111 closest to the partition 131 and the rear end of the heat transfer tube 111 adjacent to the right thereof are connected by the connection tube 112, the front end of the heat transfer tube 111 adjacent to the right of the heat transfer tube 111 closest to the partition 131 is connected to the front end of the heat transfer tube 111 adjacent to the right of the heat transfer tube 111 by the connection tube 112, and so on. The heat pipe 111 is connected in series in a meandering manner. As shown in FIG. 6, a metal wire 111A is wired on the inner peripheral surface of each heat transfer tube 111 so as to extend spirally in the longitudinal direction. Further, as shown in FIG. 2 , heat transfer fins 113 are attached to the outer peripheral surface of each heat transfer tube 111 .

As shown in FIG. 6 , in the hot water primary heat exchanger 110, the opening at the rear end of the heat transfer tube 111 furthest from the partition 131 is the hot water inlet opening 114 into which the water from the hot water supply secondary heat exchanger 210 flows, and the opening at the front end of the heat transfer tube 111 closest to the partition 131 is the hot water outlet opening 115 through which the heated water flows out. In other words, water flowing from the rear side of primary heat exchanger 110 meanders and flows in a direction approaching partition portion 131 and flows out to the front side. One end of a hot water supply relay pipe 15 is connected to the hot water supply inlet opening 114 . The other end of the hot water supply relay pipe 15 communicates with an outlet of a hot water supply secondary heat exchanger 210, which will be described later.

As shown in FIG. 6 , the bath primary heat exchanger 120 includes a plurality of heat transfer tubes 121 and a plurality of connection tubes 122 similar to the heat transfer tubes 111 and connection tubes 112 of the hot water supply primary heat exchanger 110 . The bath primary heat exchanger 120 is composed of a smaller number of heat transfer tubes 121 than the heat transfer tubes 111 of the hot water supply primary heat exchanger 110 . That is, the bath primary heat exchanger 120 has a shorter heat exchange path than the hot water supply primary heat exchanger 110 . The bath primary heat exchanger 120 is the same as the hot water supply primary heat exchanger 110 in that the number of heat transfer tubes 121 is plural (in this embodiment, the number is an odd number of three). The plurality of heat transfer tubes 121 are arranged along the front-rear direction, and both ends thereof are fixed to the front wall portion 132 and the rear wall portion 133 of the can body 130, respectively. Each heat transfer tube 121 is arranged in a single stage in the horizontal direction from the left side of the partition portion 131 toward the left wall portion 134 at substantially the center of the can body 130 in the vertical direction. In the plurality of heat transfer tubes 121, the rear end of the heat transfer tube 121 closest to the partition portion 131 and the rear end of the heat transfer tube 121 adjacent to the left thereof are connected by the connection pipe 122, the front end of the heat transfer tube 121 adjacent to the left side of the heat transfer tube 121 closest to the partition portion 131 is connected to the front end of the heat transfer tube 121 adjacent to the right side by the connection pipe 122, and so on. The heat pipe 121 is connected in series in a meandering manner. As shown in FIGS. 6 and 7, a metal wire 121A is wired on the inner peripheral surface of each heat transfer tube 121 so as to extend spirally in the longitudinal direction. Moreover, as shown in FIG. 2 , a plurality of heat transfer fins 123 are attached to the outer peripheral surface of each heat transfer tube 121 .

As shown in FIG. 6, in the bath primary heat exchanger 120, the opening at the front end of the heat transfer tube 121 closest to the partition 131 is a bath inlet opening 124 into which water flows from the bath secondary heat exchanger 220, and the opening at the rear end of the heat transfer tube 121 furthest from the partition 131 is a bath outlet opening 125 through which heated water flows out. That is, in the bath primary heat exchanger 120, the water that has flowed in from the front side meanders and flows in a direction away from the partition portion 131, and then flows out to the rear side. One end of the bath relay pipe 40 is connected to the bath entrance opening 124 . The other end of the bath relay pipe 40 communicates with an outlet of a bath secondary heat exchanger 220, which will be described later. A feed pipe 23 is connected to the bath outlet opening 125 . The service pipe 23 bends leftward from the bath outlet opening 125 and then naturally extends downward.

Moreover, as shown in FIG. 9, a resin film 140 is wound around the outer circumference of the primary heat exchange device 100 . The resin film 140 detects whether flame or heat leaks from the burner device 300 . Specifically, the resin film 140 has a wiring pattern (not shown) of a conductor printed on its front or back surface. Resin film 140 detects flame or heat leakage by breaking the conductor due to the heat when flame or heat is leaked from burner device 300 .

Next, the configuration of the secondary heat exchange device 200 will be described.
The secondary heat exchange device 200 is a latent heat recovery type heat exchange device. As shown in FIGS. 3 to 5 and 8, the secondary heat exchange device 200 is arranged above the primary heat exchange device 100. As shown in FIG. The secondary heat exchange device 200 and the primary heat exchange device 100 are connected by an exhaust hood 400 , which will be described later, for introducing the combustion exhaust that has passed through the primary heat exchange device 100 into the secondary heat exchange device 200 . As shown in FIG. 8, the secondary heat exchange device 200 is provided larger than the primary heat exchange device 100 in the horizontal direction and the vertical direction. In addition, as shown in FIG. 5, the secondary heat exchange device 200 is arranged in such a manner that the bottom surface slopes downward toward the front. Furthermore, the front end portion of the secondary heat exchange device 200 is provided so as to overhang forward from the front surface of the can body 130 of the primary heat exchange device 100 . A drain outlet 238 is provided on the lower surface of this overhang portion, and the drain hose 31 is connected to the drain outlet 238 .

The secondary heat exchange device 200 includes a housing 230, a hot water supply secondary heat exchanger 210, and a bath secondary heat exchanger 220, as shown in FIGS. The housing 230, the hot water supply secondary heat exchanger 210, and the bath secondary heat exchanger 220 may be made of stainless steel, which has excellent corrosion resistance. The housing 230 is formed in a box shape elongated in the left-right direction. The interior of the housing 230 is partitioned left and right by a partition portion 231 . The hot water supply secondary heat exchanger 210 and the bath secondary heat exchanger 220 are arranged horizontally in the housing 230 with the partition 231 interposed therebetween. Specifically, the hot water supply secondary heat exchanger 210 is housed in the right space partitioned by the partition 231 in the housing 230, and the bath secondary heat exchanger 220 is housed in the left space partitioned by the partition 231 in the housing 230. Further, as shown in FIG. 8 , partition portion 231 is arranged at a position further to the left than the center of water heater 1 compared to partition portion 131 of primary heat exchange device 100 .

As shown in FIGS. 3 to 5, the housing 230 has an inlet 232, an outlet 233, a hot water inlet 234, a hot water outlet 235, a bath inlet 236, a bath outlet 237, and a drain outlet 238. The inflow port 232 and the outflow port 233 are openings for allowing combustion exhaust gas to enter and exit the secondary heat exchange device 200 . Specifically, as shown in FIG. 5 , the inflow port 232 is formed to open in the rear wall of the housing 230 , and the outflow port 233 is formed to open in the front wall of the housing 230 . That is, in the secondary heat exchange device 200, the combustion exhaust flows through the housing 230 from the rear to the front.

The hot water supply inlet portion 234 and the hot water supply outlet portion 235 are openings for letting water flow in and out of the hot water supply secondary heat exchanger 210 . As shown in FIG. 4 , hot water supply inlet 234 and hot water supply outlet 235 are formed on the right side surface of housing 230 . The hot water supply inlet 234 is formed at a lower front position on the right side surface of the housing 230 so as to open rightward. Hot water supply inlet portion 234 communicates with the inlet of hot water supply secondary heat exchanger 210 . The downstream end of the water inlet pipe 12 is detachably connected to the hot water inlet 234 . Hot water supply outlet portion 235 is formed at a rear upper position on the right side surface of housing 230 so as to open rightward. Hot water supply outlet 235 communicates with an outlet of hot water supply secondary heat exchanger 210 . The upstream end of the hot water supply relay pipe 15 is detachably connected to the hot water supply outlet 235 . The downstream end of hot water supply relay pipe 15 communicates with hot water supply inlet opening 114 , which is the rear end opening of hot water supply primary heat exchanger 110 of primary heat exchange device 100 .

As shown in FIG. 8 , hot water supply secondary heat exchanger 210 is configured with a plurality of meandering tubes 211 . A plurality of meandering tubes 211 are stored in a housing 230 while being vertically stacked. Each meandering pipe 211 is arranged such that both ends communicate with the hot water supply inlet 234 and the hot water supply outlet 235, respectively. The hot water supply secondary heat exchanger 210 performs heat exchange by passing water through each meandering pipe 211 in parallel.

The bath inlet portion 236 and the bath outlet portion 237 are openings for allowing water to flow in and out of the bath secondary heat exchanger 220 . As shown in FIG. 3 , the bath entrance portion 236 and the bath exit portion 237 are formed on the left side surface of the housing 230 . The entrance part 236 for bath is formed in the left side of the housing 230 at a lower position near the front side so as to open leftward. The bath inlet 236 communicates with the inlet of the bath secondary heat exchanger 220 . The downstream end of the return pipe 22 is detachably connected to the bath inlet 236 . The bath outlet 237 is formed at a position near the upper rear side of the left side surface of the housing 230 so as to open leftward. The bath outlet 237 communicates with the outlet of the bath secondary heat exchanger 220 . The upstream end of the bath relay pipe 40 is detachably connected to the bath outlet 237 . A downstream end of the bath relay pipe 40 communicates with a bath inlet opening 124 that is a front end opening of the bath primary heat exchanger 120 of the primary heat exchange device 100 .

As shown in FIG. 8, the bath secondary heat exchanger 220 is configured with a plurality of serpentine tubes 221 . A plurality of serpentine tubes 221 are stacked vertically and stored in a housing 230 . Each serpentine pipe 221 is arranged in such a manner that both ends communicate with the bath entrance portion 236 and the bath exit portion 237, respectively. The bath secondary heat exchanger 220 performs heat exchange by passing water through each meandering tube 221 in parallel.

As described above, the bath relay pipe 40 connects the bath outlet 237 of the secondary heat exchange device 200 and the bath inlet opening 124 of the bath primary heat exchanger 120, and introduces hot water from the bath secondary heat exchanger 220 into the bath primary heat exchanger 120 through the bath inlet opening 124. As shown in FIG. 3 , the bath relay pipe 40 has a downstream pipe portion 41 and an upstream pipe portion 42 .

As shown in FIG. 3, the downstream pipe portion 41 is fixed in communication with the bath entrance opening 124 at its downstream end. The upstream end of the downstream pipe portion 41 is a connecting portion 41A detachably connected to the upstream pipe portion 42 . The connection portion 41A is formed so as to open rightward, which is the same direction as the opening direction of the bath outlet portion 237 . The downstream pipe portion 41 is configured to have an oblique portion 41B and a horizontal portion 41C. The inclined portion 41B is formed so that its downstream end is connected to the bath entrance opening 124 and extends forward, and is bent in front of the bath entrance opening 124 to extend obliquely upward to the left. The horizontal portion 41C has a downstream end that is continuous with an upstream end of the oblique portion 41B, and extends substantially horizontally leftward after passing over the upper end of the can body 130 . The upstream end of the horizontal portion 41C is the connecting portion 41A.

The upstream pipe portion 42 has an upstream end detachably connected to the bath outlet portion 237 of the secondary heat exchange device 200 and a downstream end detachably connected to the connecting portion 41A, which is the upstream end of the downstream pipe portion 41 . The upstream pipe portion 42 is formed in such a manner that both ends thereof open in the same direction. As shown in FIG. 3, the upstream pipe portion 42 has a connecting portion 42A, an oblique portion 42B, a descending portion 42C, and a connecting portion 42D. 42 A of connection parts are the upstream ends of the upstream pipe part 42, and are a part connected with the outlet part 237 for baths. The slanted portion 42B extends leftward from the upstream end, bends to the left of the bath outlet 237, and extends obliquely downward and forward when the connecting portion 42A is connected to the bath outlet 237. As shown in FIG. The descending portion 42C is continuous with the downstream end of the oblique portion 42B, extends downward beyond the bath entrance portion 236, and has its lower end bent rightward. The connecting portion 42D is provided at the downstream end of the descending portion 42C, and is detachably connected to the connecting portion 41A, which is the upstream end of the downstream pipe portion 41. As shown in FIG.

As shown in FIGS. 5 and 6, the drain outlet 238 is formed on the lower front end portion of the housing 230 . As shown in FIG. 5, the drain outlet 238 is provided by joining a tubular member to the periphery of the opening formed on the lower surface of the housing 230 by welding or the like. Specifically, it has a tubular shape (more specifically, a cylindrical shape) extending along the vertical direction. As described above, since the housing 230 is tilted forward, the drain generated from the latent heat-recovered combustion exhaust flows toward the front of the housing 230 and is preferably discharged from the drain outlet 238 . Further, as shown in FIGS. 6 and 8, the drain outlet 238 is formed at a position corresponding to the partition portion 131 of the primary heat exchange device 100 in the left-right direction.

The drain hose 31 is inserted into a cylindrical drain outlet 238 and fixed to the drain outlet 238 by a hose band 31Z. The drain hose 31 is made of, for example, a resin material, and is configured to retain a predetermined shape in a natural state without external pressing force and to be flexibly deformable. The drain hose 31 connected to the drain outlet 238 is arranged to extend downward in front of the partition portion 131 . Specifically, the drain hose 31 includes a first downwardly extending portion 31A, a first bent portion 31B, a laterally extending portion 31C, a second bent portion 31D, and a second downwardly extending portion 31E. The first downwardly extending portion 31A is a pipeline having one end (upper end) connected to the drain outlet 238 and extending downward along the front end of the partition 131 from the drain outlet 238 . Since the drain discharge port 238 extending along the vertical direction is fitted in the upper end portion of the first downward extension portion 31A, the first downward extension portion 31A is arranged along the vertical direction so as to follow the drain discharge port 238. In this configuration, the lateral region of the partition portion 131 is positioned within the lateral region of the first downwardly extending portion 31A. The first bent portion 31B is a pipeline that continues to the lower end of the first downwardly extending portion 31A, and is a pipeline that is bent forward from the first downwardly extending portion 31A and toward one side in the left-right direction. In this configuration, a part of the lower end side of the first downwardly extending portion 31A overlaps the can body 130 in the front-rear direction, and the first bent portion 31B is farther forward from the can body 130 than the first downwardly extending portion 31A. The laterally extending portion 31C is a duct that continues to the first bent portion 31B and extends to one side in the left-right direction from the first bent portion 31B. In this configuration, the laterally extending portion 31C is arranged in front of the first downwardly extending portion 31A, and has a positional relationship in which the laterally extending portion 31C is less likely to come into contact with the can body 130 or the like. The second bent portion 31D is a pipeline that continues to the laterally extending portion 31C, and is a pipeline that is bent downward from the laterally extending portion 31C. The second downwardly extending portion 31E is a pipeline that continues to the second bent portion 31D, extends along the vertical direction, and is configured such that the end opposite to the second curved portion 31D is connected to the neutralizer 32.

As described above, the heat transfer pipes 111 and 121 on the left and right sides of the partition 131 are connected to the hot water discharge pipe 13 and the downstream pipe portion 41 of the bath relay pipe 40, respectively. The drain hose 31 extends downward between the hot water outlet pipe 13 and the bath relay pipe 40 . Specifically, the drain hose 31 is formed to extend straight downward from the drain outlet 238 beyond the height of the flange 136 at the upper end of the can body 130 in a state of being connected to the drain outlet 238, and then extend obliquely downward and forward away from the can body 130. - 特許庁After that, the drain hose 31 is bent to the left, gently downwardly inclined, extends to the left of the side surface of the can body 130, bends obliquely downward to the rear, and extends to a neutralizer 32 arranged on the lower left side surface to be connected. Also, the drain hose 31 is routed so as to pass outside the resin film 140 wound around the outer periphery of the primary heat exchange device 100 .

The burner device 300 burns combustion gas to generate combustion exhaust. As shown in FIG. 8 , the burner device 300 includes a burner case 330 , a hot water supply burner group 310 and a bath burner group 320 . The burner case 330 is provided below the can body 130 of the primary heat exchange device 100 . The burner case 330 has a substantially rectangular shape in a plan view that is long in the left-right direction and has an open upper end. The burner case 330 has a rectangular tubular shape similar to the can body 130 . The interior of the burner case 330 is partitioned left and right by a partition portion 331 .

As shown in FIG. 8 , the hot water supply burner group 310 and the bath burner group 320 are arranged side by side in the left-right direction inside the burner case 330 via the partition portion 331 . In other words, the hot water supply burner group 310 is housed in the right space partitioned by the partition part 331 in the burner case 330, and the bath burner group 320 is housed in the left space partitioned by the partition part 331 in the burner case 330. Accordingly, hot water supply burner group 310 is arranged below hot water supply primary heat exchanger 110 and supplies combustion exhaust gas to hot water supply circuit 10 . The bath burner group 320 is arranged below the bath primary heat exchanger 120 and supplies combustion exhaust gas to the bath circuit 20 . As shown in FIG. 8 , the partition 331 is connected to the lower end of the partition 131 of the primary heat exchange device 100 . As a result, the left and right spaces within the burner case 330 are partitioned so as to be connected to the left and right spaces within the can body 130 of the primary heat exchange device 100 .

As shown in FIGS. 1 and 2, a spark plug 311 and a flame rod 312 are arranged in the space above the hot water supply burner group 310 . Similarly, an ignition plug 321 and a flame rod 322 are arranged above the bath burner group 320 . These spark plugs 311 , 321 and flame rods 312 , 322 are inserted into the burner case 330 from the front surface of the burner case 330 . Rear ends of the spark plugs 311 and 321 and the flame rods 312 and 322 protrude forward from the front surface of the burner case 330, respectively. Wires (not shown) are connected to the spark plugs 311, 321 and the rear ends of the frame rods 312, 322, respectively.

The burner device 300 and the primary heat exchange device 100 are connected and fixed by caulking. Specifically, as shown in FIG. 7, a flange portion 332 is formed at the upper end portion of the burner case 330 to receive the flange portion 136 of the can body 130 from below through the packing 50 . The flange portion 332 is formed to extend outward from the upper end of the burner case 330 in a flange shape. A vertical wall portion 333 is provided at the tip of the flange portion 332 so as to rise upward. A plurality of crimped portions 334 are provided along the circumferential direction at the upper end of the standing wall portion 333 . By bending these crimped portions 334 inward, the collar portion 136 is crimped and fixed, and the burner device 300 and the primary heat exchange device 100 are connected.

As shown in FIGS. 5 and 8 , the exhaust hood 400 is arranged between the primary heat exchange device 100 and the secondary heat exchange device 200 . The exhaust hood 400 communicates the upper end opening of the can body 130 of the primary heat exchange device 100 with the inlet 232 in the rear wall of the housing 230 of the secondary heat exchange device 200 to form a combustion exhaust passage. The inside of the exhaust hood 400 is partitioned left and right by a partition portion 401 . Partition 401 connects the upper end of partition 131 of primary heat exchange device 100 and the rear end of partition 231 of secondary heat exchange device 200 to form spaces corresponding to hot water supply circuit 10 and bath circuit 20, respectively.

Further, as shown in FIG. 7, the lower end of the exhaust hood 400 is provided with a flange portion 402, an upright wall portion 403, and a plurality of crimped portions 404, which are connected and fixed to the upper end of the primary heat exchange device 100 by crimping. Specifically, the flange portion 402 extends outward from the lower end of the exhaust hood 400 in a flange shape, and receives the flange portion 136 at the upper end portion of the can body 130 from above via the packing 50 . The standing wall portion 403 is provided in a form extending downward from the tip of the flange portion 402 . A plurality of crimped portions 404 are provided along the circumferential direction at the lower end of the standing wall portion 403 . By bending these crimped portions 404 inward, the collar portion 136 of the primary heat exchange device 100 is crimped and fixed, and the exhaust hood 400 and the primary heat exchange device 100 are connected.

Next, the effects of the water heater 1 according to this embodiment will be described.
In the water heater 1 of the first embodiment, the drain outlet 238 of the secondary heat exchange device 200 is formed at a position corresponding to the partition portion 131 of the primary heat exchange device 100 . Therefore, the drain hose 31 can be extended along the partition portion 131 of the primary heat exchange device 100 by arranging the drain hose 31 to extend downward from the drain outlet 238 as it is. The partition 131 is positioned between the left and right primary heat exchangers 110 and 120 through which combustion exhaust passes, and is a relatively low temperature portion of the primary heat exchange device 100 . Therefore, even if the drain hose 31 is bent and comes into contact with and close to the can 130, damage to the drain hose 31 can be suppressed compared to the case of contact with and close to the portions corresponding to the primary heat exchangers 110 and 120 of the can 130.例文帳に追加Moreover, since the drain hose 31 is arranged to extend straight downward from the drain outlet 238, the attachment of the drain hose 31 to the drain outlet 238 is also improved. Furthermore, since the drain hose 31 is arranged extending downward, the space on both sides of the drain hose 31 in the primary heat exchange device 100 can be effectively utilized.

Therefore, the water heater 1 of the first embodiment can achieve both good attachability of the drain hose and suppression of breakage.

Water heater 1 may include resin film 140 provided with a conductor. The resin films 140 surround the primary heat exchange device 100 and are arranged on both the front and rear sides and the left and right sides of the primary heat exchange device 100 . The drain hose 31 extends downward from the drain outlet 238 so as to pass through the outside of the resin film 140 . Specifically, the resin film 140 has a configuration in which a conductor for detecting leakage of combustion exhaust is printed, and is wound around the outer periphery of the primary heat exchange device 100, and the drain hose 31 is arranged outside the resin film 140. This water heater 1 can suppress or prevent the drain hose 31 from contacting the can body 130 by the resin film 140 disposed inside the drain hose 31 even when the drain hose 31 is flexed or displaced in a direction approaching the can body 130.

In addition, the primary heat exchanger 120 for bath includes a plurality of heat transfer tubes 121 extending in the front-rear direction sequentially arranged from a side closer to the partition 131 toward a side farther from the partition 131, and a plurality of connecting tubes 122 connecting ends of the plurality of heat transfer tubes 121 to each other. A bath relay pipe 40 for introducing hot water heated in the bath secondary heat exchanger 220 into the bath primary heat exchanger 120 is connected as an introduction pipe to the front end portion of the heat transfer pipe 121 closest to the partition portion 131. Therefore, even when the drain hose 31 is bent in the left-right direction, it comes into contact with the bath relay pipe 40 having a temperature lower than that of hot water before being heated. Therefore, damage to the drain hose due to heat can be suppressed as compared with the case of direct contact with the can body or the case of contact with piping through which hot water after heating flows.

<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 first embodiment, the bath relay pipe for introducing the hot water heated by the bath secondary heat exchanger to the bath primary heat exchanger was exemplified as the introduction pipe in the first embodiment.

In the first embodiment, the resin film is wound around the outer periphery of the can body, and the drain hose is arranged outside the resin film.

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.

DESCRIPTION OF SYMBOLS 1... Water heater 31... Drain hose 32... Neutralizer 100... Primary heat exchange device 110, 120... Primary heat exchanger 111, 121... Heat transfer tube 112, 122... Connection pipe 130... Can body 131... Partition part 140... Resin film 200... Secondary heat exchange device 238... Drain outlet

Claims (2)

A primary heat exchange device having a can whose interior is partitioned left and right by a partition, and two primary heat exchangers arranged adjacent to each other in the left and right direction with the partition interposed in the can, and recovering sensible heat of combustion exhaust gas;
a secondary heat exchange device disposed above the primary heat exchange device and formed with a drain outlet for recovering the latent heat of the combustion exhaust gas and for discharging drain generated as the latent heat is recovered;
a drain hose connected to the drain outlet and guiding the drain discharged from the drain outlet;
A water heater comprising
The secondary heat exchange device is arranged in such a manner that a front end thereof protrudes forward from the front surface of the can body,
The drain outlet is formed below the front end portion and at a position corresponding to the partition portion in the left-right direction ,
Each of the primary heat exchangers includes a plurality of heat transfer tubes extending in the front-rear direction and sequentially arranged from a side closer to the partition toward a side farther from the partition, and a plurality of connection tubes connecting ends of the plurality of heat transfer tubes to each other.
In at least one of the two primary heat exchangers, an introduction pipe for introducing hot water is connected to the front end of the heat transfer tube closest to the partition.
Water heater. comprising a resin film provided with a conductor,
The resin film is arranged on both front and rear sides and on both left and right sides of the primary heat exchange device so as to surround the primary heat exchange device,
The water heater according to claim 1, wherein the drain hose extends downward from the drain outlet side so as to pass through the outside of the resin film.

Images