JP2016056990A - Hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply device capable of preventing hot water higher than a setting temperature from being tapped, when hot water supply is executed again after hot water supply is stopped in a hot water supply circuit.SOLUTION: A hot water supply device 1 includes a can body 10, a burner 11, a hot water supply circuit 2 and a bath after-burning circuit 3. A secondary heat exchanger 22 of the hot water supply circuit 2 is arranged above in a vertical direction with respect to a first primary heat exchanger 21. The bath after-burning circuit 3 has a second primary heat exchanger 32. A water inlet path 24 of the hot water supply circuit 2 is arranged between the secondary heat exchanger 22 and a bypass path 18, and has a curve part CP once extending downward in the vertical direction and extending upward.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot water supply apparatus, and more particularly to a hot water supply apparatus capable of recovering sensible heat and latent heat of fuel gas.

  Conventionally, so-called one-can two-water hot water supply apparatuses have been used. The single can / two-water type hot water supply apparatus includes two heat exchange circuit heat exchangers in one can. Each heat exchanger of the two heat exchange circuits shares one burner to perform heat exchange. The two heat exchange circuits are, for example, a hot water supply circuit and a bath remedy circuit. Japanese Patent Laid-Open No. 2001-91048 (Patent Document 1) discloses a single can / two-water type hot water supply apparatus in which each heat exchanger of a hot water supply circuit and a bath chase circuit is provided in one can.

  In addition, a latent heat recovery type hot water supply apparatus including a primary heat exchanger for recovering sensible heat of combustion exhaust gas and a secondary heat exchanger for recovering latent heat of combustion exhaust gas is provided in order to increase thermal efficiency. It has been put into practical use.

  And the hot water supply apparatus which combined said 1 can 2 water type hot water supply apparatus and a latent heat recovery type hot water supply apparatus is also developed.

JP 2001-91048 A

  In a hot water supply apparatus that combines the above-described one-can two-water hot water supply apparatus and a latent heat recovery type hot water supply apparatus, the secondary heat exchanger of the hot water supply circuit may be disposed above the primary heat exchanger. The outlet side of the primary heat exchanger and the incoming side of the secondary heat exchanger are connected by a bypass. In such a hot water supply apparatus, when hot water supply is stopped from a state in which hot water supply in the hot water supply circuit and reheating in the bath tracking circuit are simultaneously performed, the primary heat exchanger is caused by the inertial force of the hot water flowing through the hot water supply circuit. Hot water flows into the secondary heat exchanger through the bypass. Furthermore, since the reheating in the bath reheating circuit is executed, the primary heat exchanger of the hot water supply circuit is heated by the burner, and the hot water in the hot water supply circuit becomes high temperature. Moreover, since the secondary heat exchanger of the hot water supply circuit is disposed above the primary heat exchanger, hot hot water convects from the primary heat exchanger through the bypass path to the secondary heat exchanger. Therefore, in the hot water supply circuit, the hot water in the hot water supply circuit becomes hot despite the fact that the hot water supply is stopped. For this reason, when hot water supply is performed again after hot water supply is stopped in the hot water supply circuit, hot water having a temperature higher than the set temperature is discharged.

  The present invention has been made in view of the above problems, and its purpose is to prevent hot water having a temperature higher than the set temperature from being discharged when hot water is supplied again after hot water is stopped in the hot water supply circuit. It is to provide a hot water supply device that can be used.

  The hot water supply apparatus of the present invention can recover sensible heat and latent heat of combustion gas. The hot water supply apparatus includes a can, a burner, a hot water supply circuit, and another system circuit. The burner is disposed in the can and is for supplying combustion gas. The hot water supply circuit has a first primary heat exchanger, a secondary heat exchanger, a water inlet channel, a hot water outlet channel, and a bypass channel. The first primary heat exchanger is disposed in the can and is for recovering sensible heat of the combustion gas supplied by the burner. The secondary heat exchanger is disposed above the first primary heat exchanger in the vertical direction, is connected to the first primary heat exchanger, and is for recovering the latent heat of the combustion gas. The water intake channel is connected to the secondary heat exchanger and is used to enter the hot water supply device. The hot water outlet is connected to the first primary heat exchanger and is used to discharge hot water from the hot water supply device. The bypass route connects the water inlet and the hot water outlet. The other system circuit is disposed in the can and has a second primary heat exchanger for recovering sensible heat of the combustion gas supplied by the burner. The water inlet channel is disposed between the secondary heat exchanger and the bypass channel, and includes a curved portion that extends downward in the vertical direction and then extends upward.

  According to the hot water supply device of the present invention, the water inlet arranged between the secondary heat exchanger and the bypass passage includes a curved portion extending downward after extending downward in the vertical direction. Therefore, the length of the water inlet can be increased by the curved portion. Furthermore, hot water can be made difficult to flow by flowing hot water from below to above. Therefore, when the hot water supply in the hot water supply circuit is stopped, the hot water flowing from the first primary heat exchanger through the bypass path to the secondary heat exchanger by the inertial force of the hot water flowing through the hot water supply circuit is less than the curved portion. It can suppress flowing to the next heat exchanger side. Further, since the curved portion extends downward in the vertical direction, convection of hot hot water moving upward can be suppressed. As mentioned above, when hot water supply is performed again after hot water supply is stopped in the hot water supply circuit, hot water having a temperature higher than the set temperature can be prevented from being discharged.

  In the hot water supply apparatus described above, the lower end of the bending portion is located below the first primary heat exchanger in the vertical direction. For this reason, the lower end of a curved part can be arrange | positioned in a low position. Thereby, it is possible to make it difficult for hot water to flow upward from the lower end of the curved portion. Moreover, it can suppress that hot hot water flows to the lower end of a curved part.

  In the above hot water supply apparatus, the curved portion has a U-shape. For this reason, the bending portion has a bottom and an extending portion connected to both sides of the bottom. Thereby, the length of a bending part can be lengthened.

  In the hot water supply apparatus described above, the bending portion is disposed on the bypass path side and extends downward in the vertical direction, and is connected to the downward portion, and is disposed on the secondary heat exchanger side relative to the downward portion. And an upward portion that is connected to the intermediate portion, is disposed closer to the secondary heat exchanger than the intermediate portion, and extends upward in the vertical direction. The downward portion and the intermediate portion are connected at a right angle, and the intermediate portion and the upward portion are connected at a right angle. For this reason, it is possible to make it difficult for hot water to flow from the downward portion to the intermediate portion, and to prevent hot water from flowing from the intermediate portion to the upward portion.

  In said hot water supply apparatus, another system circuit is for circulating the bathtub water stored by the bathtub. The other system circuit is connected to the bathtub so that the bathtub water taken from the bathtub can be supplied to the bathtub again through the second primary heat exchanger. For this reason, bath water can be chased by making another system circuit into a bath chasing circuit.

  As described above, according to the present invention, it is possible to provide a hot water supply apparatus that can prevent hot water having a temperature higher than the set temperature from being discharged when hot water supply is performed again after hot water supply is stopped in a hot water supply circuit. Can do.

It is an operation principle figure showing roughly composition of a hot-water supply system in one embodiment of the present invention. It is a block diagram which shows schematically the structure of the hot water supply apparatus in one embodiment of this invention. It is a perspective view which shows roughly the structure of the water intake pipe of the hot water supply apparatus in one embodiment of this invention. It is an operation principle figure showing roughly composition of a hot-water supply system in a comparative example. It is a perspective view which shows roughly the structure of the water intake pipe of a comparative example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, with reference to FIG. 1, the structure of the hot water supply system of one embodiment of this invention is demonstrated. In addition, FIG. 1 is the figure which looked at the hot water supply apparatus 1 from the front side, and FIG. 2 is the figure which looked at the hot water supply apparatus 1 from the back side.

  The hot water supply system of the present embodiment includes a hot water supply device 1 and a bathtub 100. The hot water supply apparatus of the present embodiment includes two heat exchange circuit heat exchangers in one can. Moreover, the hot water supply apparatus 1 of this Embodiment is a hot water supply apparatus which can collect | recover sensible heat and latent heat of combustion gas. That is, the hot water supply device 1 of the present embodiment is a combination of a single can / two water type hot water supply device and a latent heat recovery type hot water supply device.

  The hot water supply device 1 of the present embodiment is a bath with a hot water heater. Hereinafter, in the hot water supply apparatus 1 of this Embodiment, what provided the bath memorial circuit as another system circuit is demonstrated. The other system circuit is not limited to the bath chase circuit, and may be a heating circuit, for example. Further, the other system circuit is not limited to one circuit and may be two or more circuits. That is, the present invention is not limited to a single can / two-water type hot water supply device, and can be applied to a single can / multi-water type hot water supply device.

  The hot water supply apparatus 1 according to the present embodiment includes a housing 1a, a hot water supply circuit 2, a bath chase circuit (another system circuit) 3, a pouring circuit 4, a can body 10, a burner 11, and a blower 12. The exhaust collecting cylinder 13, the silencer 14, the neutralizer 15, the fuel pipe 16, the flow rate adjusting valve 17, and the pump 18 are provided.

  The casing 1a includes a hot water supply circuit 2, a bath chase circuit 3, a pouring circuit 4, a can 10, a burner 11, a blower 12, an exhaust collecting cylinder 13, a silencer 14, and a neutralizer. 15, a fuel pipe 16, a flow rate adjustment valve 17, and a pump 18 are accommodated. The housing 1a has an exhaust port EP. The exhaust port EP is for exhausting the combustion gas from which sensible heat and latent heat have been recovered to the outside of the housing 1a. The housing 1a is provided with a water inlet 20a for water supply and a hot water outlet 20b for hot water supply.

  The hot water supply circuit 2 is for realizing hot water supply. The hot water supply circuit 2 is for heating and supplying hot water supplied by the supply water pressure. The hot water supply circuit 2 mainly includes a first primary heat exchanger 21, a secondary heat exchanger 22, a connecting pipe 23, a water inlet path 24, a hot water outlet path 25, and a bypass path 26.

  The first primary heat exchanger 21 is for recovering sensible heat of the combustion gas supplied by the burner 11. The first primary heat exchanger 21 is disposed in the can body 10. The hot water in the first primary heat exchanger 21 is heated by heat exchange with the high-temperature combustion gas.

  The secondary heat exchanger 22 is for recovering the latent heat of the combustion gas. The secondary heat exchanger 22 is disposed above the first primary heat exchanger 21 in the vertical direction. The secondary heat exchanger 22 is connected to the first primary heat exchanger 21. Specifically, one end of the first primary heat exchanger 21 and one end of the secondary heat exchanger 22 are connected to each other by a connecting pipe 23. The combustion gas after heat exchange in the first primary heat exchanger 21 is passed to the secondary heat exchanger 22 so that hot water in the secondary heat exchanger 22 is preheated. In this process, the temperature of the combustion gas is lowered to about 60 ° C., so that moisture contained in the combustion gas is condensed and latent heat can be obtained.

  The water inlet 24 is for entering the hot water supply apparatus 1. The water inlet 24 is connected to the secondary heat exchanger 22. Further, the water inlet 24 is connected to the water inlet 20a. The water inlet 20a leads to the water supply. The water inlet 24 connects the water inlet 20 a and the secondary heat exchanger 22. The water inlet channel 24 includes a water inlet pipe 24 a, a distribution valve 27, a water amount sensor 28, and a temperature sensor 29. The water inlet pipe 24a is configured to be able to supply water to the secondary heat exchanger 22 from the water inlet 20a. The distribution valve 27 is configured to be able to distribute the water supply from the water inlet path 24 to the bypass path 26. Depending on the opening of the distribution valve 27, a part of the water supply amount is diverted from the water inlet 24 to the bypass 26. The water amount sensor 28 is configured to detect the amount of water supply. The water supply amount diverted by the distribution valve 27 is detected by the water amount sensor 28. The temperature sensor 29 is configured to detect the incoming water temperature. The temperature sensor 29 detects the incoming temperature of hot water passing through the distribution valve 27.

  Further, the water inlet 24 includes a curved portion CP. The curved portion CP is disposed between the secondary heat exchanger 22 and the bypass path 26. The bending portion CP is configured to extend downward and then upward in the vertical direction.

  The hot water supply passage 25 is for discharging hot water from the hot water supply apparatus 1. The hot water outlet 25 is connected to the first primary heat exchanger 21. Further, the hot water outlet 25 is connected to the hot water outlet 20b. The hot water outlet 20 b is connected to the hot water tap 200. The hot water outlet 25 connects the hot water outlet 20b and the first primary heat exchanger 21 to each other. The water supplied from the inlet 20a is heated by the combustion gas when passing through the first primary heat exchanger 21 and the secondary heat exchanger 22, and is supplied from the outlet 20b. The hot water passage 25 has a hot water pipe 25a and a water amount servo WS. The tapping pipe 25a is configured to be able to supply hot water from the first primary heat exchanger 21 to the tapping outlet 20b. The water amount servo WS is configured to be able to control the flow rate discharged from the hot water outlet 20b.

  The bypass path 26 connects the water inlet path 24 and the hot water path 25. The bypass path 26 has a bypass pipe 26a. The bypass passage 26 is connected to the distribution valve 27 of the water inlet passage 24 and the hot water outlet pipe 25 a of the hot water outlet passage 25. The bypass path 26 is connected to the hot water supply path 25 at the junction portion JP. Accordingly, the hot water supplied from the hot water outlet 25 and the water supplied from the bypass 26 are mixed at the junction JP. Thereby, hot water of an appropriate temperature is supplied to the hot water pouring circuit 4 that leads to the hot water tap 200 or the bathtub 100.

  The bath memorial circuit 3 is for realizing a bath memorial function. The bath memorial circuit 3 is for chasing hot water in the bathtub 100. The bath memorial circuit 3 is for circulating the bathtub water stored in the bathtub 100. The hot water supply device 1 and the bathtub 100 are connected by a bath return pipe 101 and a bath outlet pipe 102. The bath return pipe 101 and the bath return pipe 102 are each connected to the bath chase circuit 3. The upstream end of the bath return pipe 101 is connected to the suction side of the circulation adapter 103 installed in the bathtub 100. Further, the downstream end of the bath outlet pipe 102 is connected to the discharge side of the circulation adapter 103.

  The bath remedy circuit 3 includes a pipe 31, a second primary heat exchanger 32, a circulation pump 33, a water flow switch 34, a water level sensor 35, and a temperature sensor 36. The second primary heat exchanger 32 is for recovering sensible heat of the combustion gas supplied by the burner 11. The second primary heat exchanger 32 is disposed in the can 10. The hot water in the second primary heat exchanger 32 is heated by heat exchange with the high-temperature combustion gas. The bath memory circuit 3 is connected to the bathtub 100 so that the bathtub water taken from the bathtub 100 can be supplied again to the bathtub 100 through the second primary heat exchanger 32.

  The circulation pump 33 is configured to be able to circulate hot water and water in the bath chase circuit 3. When the circulation pump 33 is operated, the bath water of the bathtub 100 is supplied from the suction port of the circulation adapter 103 via the bath return pipe 101, the second primary heat exchanger 32, and the bath outlet pipe 102. It circulates the path to the discharge port. The bath water circulating in the bath chase circuit 3 is heated by the second primary heat exchanger 32 to realize the chase function.

  The water flow switch 34 is disposed on the downstream side of the circulation pump 33. The water flow switch 34 is configured to be able to detect the water flow of hot water flowing through the bath chase circuit 3. The temperature sensor 36 is configured to be able to measure the temperature of hot water flowing through the bath chase circuit 3. The water level sensor 35 is connected to the bath return pipe 101. The water level sensor 35 is configured to be able to measure the water level of the bathtub water in the bathtub 100.

  The pouring circuit 4 is for realizing a bath filling function. The pouring circuit 4 is for supplying hot water to the bathtub 100. The pouring circuit 4 includes a pipe 41, a pouring electromagnetic valve 42, a water amount sensor 43, a check valve 44, and a check valve 45. A water pouring solenoid valve 42 is connected to the water amount servo WS via a pipe 41 and a water amount sensor 43. The hot water solenoid valve 42 is controlled to open and close, and is configured to be able to supply and stop hot water from the hot water supply circuit 2 to the hot water supply circuit 4 and the bath chase circuit 3. The water amount sensor 43 detects the amount of hot water supplied from the hot water supply circuit 2 to the pouring circuit 4 via the water amount servo WS. The check valve 44 is connected to the pouring electromagnetic valve 42. The check valve 44 can prevent the hot water supplied to the pouring circuit 4 and the bath chase circuit 3 from flowing backward to the water amount servo WS side.

  The backflow prevention valve 45 normally closes the overflow port due to the pressure difference between the pressure on the water supply source side (primary pressure) and the pressure on the supply destination side (secondary pressure). The backflow prevention valve 45 is connected to the distribution valve 27 through the pipe 50 in order to introduce the primary pressure, and is connected to the hot water solenoid valve 42 through the check valve 44 in order to introduce the secondary pressure.

  The can 10 accommodates the burner 11, the first primary heat exchanger 21, and the second primary heat exchanger 32. The burner 11 is disposed in the can 1a and supplies combustion gas. The burner 11 generates a combustion gas for performing heat exchange with the first primary heat exchanger 21, the second primary heat exchanger 32, and the secondary heat exchanger 22 to generate a first primary heat exchange. For supplying to the heat exchanger 21, the second primary heat exchanger 32 and the secondary heat exchanger 22.

  The burner 11 is a reverse combustion type device in which liquid fuel such as kerosene is sprayed downward and burned. Specifically, the burner 11 is, for example, a gun type burner. The burner 11 has a fuel nozzle 11a and an igniter 11b. The burner 11 ignites the fuel supplied from the fuel nozzle 11a from the fuel tank (not shown) via the fuel pipe 16, the flow rate adjusting valve 17 and the pump 18 by the igniter 11b, thereby burning the fuel and generating combustion gas. It is configured to let you.

  A blower 12 is attached to the can 10. The blower 12 is for supplying air necessary for combustion to the burner 11. The blower 12 is configured to be able to supply combustion air downward from above the burner 11. Specifically, the blower 12 is a fan, for example.

  The exhaust collecting cylinder 13 and the silencer 14 constitute a combustion gas flow path connected in series. The exhaust collecting cylinder 13 is located downstream of the first primary heat exchanger 21 and the second primary heat exchanger 32. The silencer 14 is located on the downstream side of the exhaust collecting cylinder 13. The combustion gas generated in the burner 11 passes around the first primary heat exchanger 21 and the second primary heat exchanger 32 and is in the first primary heat exchanger 21 and the second primary heat exchanger 32. After exchanging heat with the hot and cold water, it is sent to the silencer 14 through the exhaust collecting cylinder 13 and discharged from the exhaust port EP to the outside of the housing 1a.

  Since the condensed water (drain) is generated due to the structure that condenses the water vapor of the combustion gas in the secondary heat exchanger 22 as described above, drainage of the drain is necessary. A neutralizer 15 is disposed below the secondary heat exchanger 22, and drainage is drained from the secondary heat exchanger 22 to the neutralizer 15. Since the combustion gas contains nitrogen oxides and the like, it dissolves in the drain and the drain becomes acidic. The neutralizer 15 is for neutralizing the acidic drain. The neutralizer 15 is filled with a neutralizing agent for neutralizing acidic drain. The drain neutralized by the neutralizer 15 is discharged out of the housing 1a through a drainage channel (not shown).

Subsequently, the configuration of the bending portion CP of the present embodiment will be described in detail.
With reference to FIG. 2, the curved portion CP is disposed between the side surface of the housing 1 a and the can 10. The curved portion CP is disposed on the opposite side of the silencer 14 with respect to the can body 10. The curved portion CP is formed from the lower end of the burner 11 to the lower end of the can body 10 in the vertical direction. The lower end of the curved portion CP is located below the first primary heat exchanger 21 in the vertical direction VD. Specifically, the lower end of the bending portion CP is located below the heat receiving pipe 21a of the first primary heat exchanger 21 in the vertical direction VD. In addition, when the heat receiving pipe 21a of the first primary heat exchanger 21 is configured in a plurality of stages, the lower end of the bending portion CP is more vertical than the upper heat receiving pipe 21a disposed on the side closer to the burner 11. What is necessary is just to be located below in the direction VD. Further, the curved portion CP has a U shape.

  Referring to FIGS. 1 and 3, one end EP <b> 1 of the water inlet pipe 24 a is connected to the water amount sensor 28, and the other end EP <b> 2 of the water inlet pipe 24 a is connected to the secondary heat exchanger 22. As indicated by the arrows in the figure, the hot water flows into the water inlet pipe 24a from one end EP1, flows through the curved portion CP, and flows out from the other end EP2. Since the bending portion CP extends downward in the vertical direction VD and then extends upward, the hot water flows into the inlet pipe 24a from one end EP1 and once flows downward after passing through the bending portion CP. Later, it flows out from the other end EP2. Further, the curved portion CP may have a bent portion VP. The length of the path of the curved portion CP can be increased by the bent portion VP.

  The curved portion CP has a downward portion CP1, an intermediate portion CP2, and an upward portion CP3. The downward portion CP1 is disposed on the bypass path 26 side. The downward portion CP1 is configured to extend downward in the vertical direction VD. The intermediate part CP2 is connected to the downward part CP1. The intermediate part CP2 is arranged closer to the secondary heat exchanger 22 than the downward part CP1. The upward portion CP3 is connected to the intermediate portion CP2. The upward portion CP3 is disposed closer to the secondary heat exchanger 22 than the intermediate portion CP2. The upward portion CP3 is configured to extend upward in the vertical direction VD. The downward portion CP1 and the intermediate portion CP2 are connected at a right angle. The intermediate part CP2 and the upward part CP3 are connected at a right angle.

  Next, the effect of this Embodiment is demonstrated compared with a comparative example. Since the configuration of the comparative example is the same as that of the above-described embodiment unless otherwise described, the same elements are denoted by the same reference numerals, and the description thereof is not repeated.

  Referring to FIGS. 4 and 5, hot water supply device 1 of the comparative example is different from hot water supply device 1 of the present embodiment in that water inlet pipe 24 a does not have a curved portion. In the hot water supply apparatus 1 of the comparative example, when hot water supply is stopped from a state where hot water supply in the hot water supply circuit 2 and hot water supply in the bath chase circuit 3 are performed simultaneously, the hot water supply circuit 2 is shown as indicated by an arrow in the figure. Hot water flows into the secondary heat exchanger 22 from the first primary heat exchanger 21 through the bypass 26 by the inertial force of the flowing hot water. Furthermore, since the reheating in the bath renewal circuit 3 is being performed, the first primary heat exchanger 21 of the hot water supply circuit 2 is heated by the burner 11, and the hot water in the hot water supply circuit 2 becomes high temperature. Further, since the secondary heat exchanger 22 of the hot water supply circuit 2 is disposed above the first primary heat exchanger 21, the secondary heat exchange from the first primary heat exchanger 21 through the bypass path 26. Hot water convects in the vessel 22. Therefore, in the hot water supply circuit 2, the hot water in the hot water supply circuit 2 becomes high temperature even though the hot water supply is stopped. For this reason, when hot water supply is performed again after hot water supply is stopped in the hot water supply circuit 2, hot water having a temperature higher than the set temperature is discharged.

  On the other hand, as shown in FIGS. 1 and 3, according to the hot water supply apparatus 1 of the present embodiment, the water inlet 24 arranged between the secondary heat exchanger 22 and the bypass 26 is in the vertical direction. A curved portion CP that extends downward and then extends upward is included. Therefore, the length of the water inlet 24 can be increased by the curved portion CP. Furthermore, hot water can be made difficult to flow by flowing hot water from below to above. Therefore, when the hot water supply in the hot water supply circuit 2 is stopped, the hot water flowing into the secondary heat exchanger 22 from the first primary heat exchanger 21 through the bypass path 26 by the inertia of the hot water flowing through the hot water supply circuit 2 is generated. It can suppress that it flows into the secondary heat exchanger 22 side rather than curved part CP. In addition, since the curved portion CP extends downward in the vertical direction, convection of hot hot water that moves upward can be suppressed. As mentioned above, when hot water supply is performed again after hot water supply is stopped in the hot water supply circuit 2, it is possible to prevent hot water having a temperature higher than the set temperature from being discharged.

  Further, as shown in FIG. 2, in the hot water supply device 1 of the present embodiment, the lower end of the curved portion CP is located below the first primary heat exchanger 21 in the vertical direction. For this reason, the lower end of the curved portion CP can be arranged at a low position. Thereby, it is possible to make it difficult for hot water to flow upward from the lower end of the curved portion CP. Moreover, it can suppress that hot hot water convects to the lower end of curved part CP.

  Moreover, in the hot water supply apparatus 1 of this Embodiment, the curved part CP has U shape. For this reason, the curved portion CP has a bottom and extending portions connected to both sides of the bottom. Thereby, the length of the curved portion CP can be increased.

  As shown in FIG. 3, in the hot water supply device 1 of the present embodiment, the downward portion CP1 and the intermediate portion CP2 of the curved portion CP are connected at a right angle, and the intermediate portion CP2 and the upward portion CP3 are at a right angle. It is connected to the. For this reason, it is possible to make it difficult for hot water to flow from the downward portion CP1 to the intermediate portion CP2, and to prevent hot water from flowing from the intermediate portion CP2 to the upward portion CP3.

  As shown in FIG. 1, in the hot water supply apparatus 1 of the present embodiment, the bath chase circuit 3 can supply the bathtub water taken from the bathtub 100 to the bathtub 100 again through the second primary heat exchanger 32. It is connected to the bathtub 100. For this reason, bath water can be re chased.

  The embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is shown not by the above description but by the claims, and It is intended to include meanings equivalent to the scope of and all modifications within the scope.

  DESCRIPTION OF SYMBOLS 1 Hot-water supply apparatus, 1a housing | casing, 2 Hot-water supply circuit, 3 Tracking circuit, 4 Pouring circuit, 10 Can body, 11 Burner, 11a Fuel nozzle, 11b Igniter, 12 Blower, 13 Exhaust collecting cylinder, 14 Silencer, 15 Neutralizer, 16 Fuel piping, 17 Flow rate adjustment valve, 18 Pump, 28, 43 Water quantity sensor, 20a Water inlet, 20b Hot water outlet, 21 First primary heat exchanger, 21a Heat receiving pipe, 22 Secondary heat exchanger, 23 Connecting pipe, 24 Inlet pipe, 24a Inlet pipe, 25 Outlet pipe, 25a Outlet pipe, 26 Bypass path, 26a Bypass pipe, 27 Distribution valve, 29, 36 Temperature sensor, 31, 41, 50 Piping, 32 Second primary Heat exchanger, 33 Circulation pump, 34 Water flow switch, 35 Water level sensor, 42 Pouring solenoid valve, 44 Check valve, 45 Backflow prevention valve, 100 Bathtub, 101 Bath return distribution Pipe, 102 Bath outlet pipe, 103 Circulation adapter, 200 Hot water tap, CP curved part, CP1 downward part, CP2 middle part, CP3 upward part, EP exhaust port, VD vertical direction, WS water quantity servo.

Claims (5)

A hot water supply device capable of recovering sensible heat and latent heat of combustion gas,
Can body,
A burner disposed in the can and for supplying the combustion gas;
A first primary heat exchanger disposed in the can and for recovering sensible heat of the combustion gas supplied by the burner, and disposed above the first primary heat exchanger in the vertical direction. A secondary heat exchanger connected to the first primary heat exchanger and for recovering the latent heat of the combustion gas; and an inlet for connecting to the secondary heat exchanger and entering the hot water supply device. A hot water supply circuit having a water channel, a hot water supply channel connected to the first primary heat exchanger for discharging hot water from the hot water supply device, and a bypass channel connecting the water input channel and the hot water supply channel;
Another system circuit having a second primary heat exchanger disposed in the can and for recovering sensible heat of the combustion gas supplied by the burner,
The hot water supply apparatus includes a curved portion that is disposed between the secondary heat exchanger and the bypass passage, and includes a curved portion that extends downward in the vertical direction and then extends upward.   The hot water supply device according to claim 1, wherein a lower end of the bending portion is located below the first primary heat exchanger in a vertical direction.   The hot water supply apparatus according to claim 1 or 2, wherein the curved portion has a U shape. The curved portion is disposed on the bypass path side and extends downward in the vertical direction, is connected to the downward portion, and is disposed on the secondary heat exchanger side with respect to the downward portion. An intermediate part, and an upward part connected to the intermediate part, disposed on the secondary heat exchanger side than the intermediate part, and extending upward in the vertical direction;
The hot water supply device according to any one of claims 1 to 3, wherein the downward portion and the intermediate portion are connected at a right angle, and the intermediate portion and the upward portion are connected at a right angle. The other system circuit is for circulating bathtub water stored in the bathtub,
The said other system circuit is connected to the said bathtub so that the said bathtub water taken in from the said bathtub can be again supplied to the said bathtub through a said 2nd primary heat exchanger. The hot water supply device described.

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