JP4784266B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply device for a single can multi-channel that circulates hot water supplied through a hot water supply heat exchanger heated by combustion heat of a burner and supplies heat to a plurality of loads.

Conventionally, as this type of combustion apparatus, as disclosed in Patent Document 1, a hot water supply heat exchanger that heats water supplied through a water supply path by combustion of a burner to supply hot water to the hot water supply path, and heating supplied through an inlet path A hot water supply apparatus provided with a fluid heat exchanger that heats a target fluid by combustion of the burner and flows out to an outlet, and the hot water heat exchanger recovers sensible heat of combustion exhaust gas of the burner A sensible heat exchange unit for hot water supply, and a latent heat heat exchange unit for hot water supply that is disposed downstream of the sensible heat exchange unit for hot water supply in the flow direction of the combustion exhaust gas of the burner and recovers the latent heat of the combustion exhaust gas of the burner The fluid heat exchanger recovers sensible heat of the combustion exhaust gas of the burner, and the combustion exhaust gas of the burner than the fluid sensible heat exchange unit. Arranged downstream of the flow direction of And a fluid latent heat exchange part for recovering the latent heat of the combustion exhaust gas of the burner, and the sensible heat exchange part for hot water supply and the sensible heat exchange part for fluid are integrated in a state of conducting heat to each other. In addition, a hot water supply apparatus is disclosed which is integrally formed in a state in which the hot water latent heat exchange unit and the fluid latent heat exchange unit conduct heat with each other (see, for example, Patent Document 1).
JP 2002-267262 A

  However, since the conventional hot water supply apparatus forms two paths for hot water supply and fluid as the paths heated by the burner, the piping configuration becomes complicated, and the combustion gas outflow path of the burner A hot water supply heat exchanger and a fluid heat exchanger are arranged, the hot water supply heat exchanger is provided with a hot water sensible heat exchange part and a hot water latent heat exchange part, and the fluid heat exchanger is provided with a fluid sensible heat exchange part. Since the heat heat exchanger and the fluid latent heat exchanger are provided, it is necessary to integrally form the hot water heat exchanger and the fluid heat exchanger in the sensible heat exchanger and the latent heat exchanger, respectively. In addition, the heat exchanger for hot water supply and the heat exchanger for fluid are forced to have extremely complicated configurations. In particular, when the structure of the latent heat exchange section is a double pipe structure using a stainless steel pipe and a copper pipe in order to improve the corrosion resistance, there is a problem in workability.

  Also, in a configuration in which hot water heated by a burner is circulated and the amount of heat is supplied to multiple utilization circuits using the circulated water, the sensible heat exchanger for fluid is replaced with a heat exchanger for heating and a bath follower. If a plurality of fluid heat exchangers are provided, the fluid heated by the hot water supply heat exchanger will be supplied to the bath heat exchanger side even when heating alone, so that the heating capacity cannot be sufficiently obtained. I had it.

  The present invention solves the above-mentioned conventional problems, and forms one heating path with a hot water supply heat exchanger and a latent heat recovery heat exchanger, and uses circulating water in the heating path to form a heating circuit or a bath circuit. By adopting a structure for supplying heat, it is possible to configure a use-side heat exchanger that is not related to the heat exchanger for hot water supply and the latent heat recovery heat exchanger. It is possible to provide a hot water supply device that is easy to use and prioritizes hot water supply performance by realizing a reduction in weight and weight and making the heating path mainly a hot water supply circuit. It is another object of the present invention to provide a hot water supply device that improves the heating capability even when the use-side heat exchanger has a heating heat exchanger and a bath heat exchanger.

In order to solve the above-described conventional problems, the hot water supply apparatus of the present invention heats the water supplied from the water supply path by combustion of the burner and supplies it to the hot water supply path via the latent heat recovery heat exchanger and the hot water supply heat exchanger. And a heating heat exchanger for supplying heat to a heating circuit having a heating device that performs heating, bathroom drying, and the like by returning to the hot water supply heat exchanger again via the hot water circulation pump to form a hot water supply circulation circuit; A bath heat exchanger that supplies heat to the bath circuit that reheats the bath is installed, and either hot water supply or heating or bath reheating is used alone, or at least two simultaneous use of hot water and heating and bath retreat is selected. Branching from the hot water supply circulation circuit via the heating heat exchanger or bath heat exchanger to form a hot water supply circuit for currant or bath pouring, and the heating heat exchanger or A water heater having a flow rate sensor in the hot water supply circulation circuit until the branch to the hot water supply circuit after passing through a heat exchanger for bath, to enable switching of hot water supply to the bath heat exchanger, the hot water off valve bath heat exchanger circulation circuit, and the hot water supply circulation circuit to the heat exchanger side for the bath separately, and bath return pipe from the water heater to the water heater from the bath forward pipe and tub for piping up bathtub , A bath circulation pump on the bath return pipe side, a flow SW for detecting whether there is hot water in the bathtub, and a bath residue for determining whether there is hot water in the bathtub when the flow SW is turned on. The bath heat exchanger open / closed bathtub residue that opens the on-off valve of the bath heat exchanger of the hot water supply circulation circuit only when it is determined by the hot water determination means and the previous bath residual hot water determination means that there is hot water / water in the bathtub. Monodea with a hot water at judging means, .

  Thereby, one heating path is formed by the heat exchanger for hot water supply and the heat exchanger for latent heat recovery, and the heat amount is supplied to the heating circuit and the bath circuit using the circulating water of the heating path. Enables the configuration of the use side heat exchanger that is not related to the hot water supply heat exchanger or the latent heat recovery heat exchanger. It is possible to provide an easy-to-use hot water supply device that prioritizes hot water supply performance by using a hot water supply circuit as a main route, and has a single heating route configuration mainly including a hot water supply circuit, and further to the bath heat exchanger side. By providing the opening / closing valve in the hot water supply device, it is possible to provide a hot water supply device that improves the heating capacity during the single heating operation and improves the safety on the bath side.

  The hot water supply apparatus of the present invention forms one heating path with the hot water supply heat exchanger and the latent heat recovery heat exchanger, and uses the circulating water of the heating path only when a flow rate signal exists in the heating path. The configuration of supplying heat to the heating circuit and the bath circuit enables the configuration of the use side heat exchanger not related to the heat exchanger for hot water supply and the latent heat recovery heat exchanger, and the main body configuration including the piping configuration It is possible to provide an easy-to-use hot water supply apparatus that prioritizes hot water supply performance by making the heating path mainly a hot water supply circuit and bath heat exchange. By providing the opening / closing valve on the heater side, it is possible to provide a hot water supply device that is improved in heating capacity and safety in a single heating operation.

1st invention heats the water supplied from a water supply path by combustion of a burner, supplies it to a hot water supply path via a heat exchanger for latent heat recovery and a heat exchanger for hot water supply, and again through the hot water supply circulation pump A hot water supply circulation circuit is formed by returning to the hot water supply heat exchanger, and a use side heat exchanger is provided in the hot water supply circulation circuit to form a circuit for supplying heat to the load side, and the use side heat exchanger A hot water supply device of a single can multi-channel that branches off from a hot water supply circulation circuit via a water source to form a hot water supply circuit for currant or bath pouring, and enables switching of hot water supply to a heat exchanger for bath, a bath heat exchanger of the on-off valve of the hot water supply circulation circuit, wherein separately from the hot water circulation circuit for the heat exchanger side bath, bath from the water heater to the water heater from the bath forward pipe and tub for piping up bathtub return pipe And bath circulation on the bath return piping side A flow SW for detecting whether there is hot water in the bathtub, a bath remaining hot water determining means for determining whether there is hot water in the bathtub when the flow SW is turned on, A bath heat exchanger on / off bathtub remaining hot water judgment means for opening the on-off valve of the bath heat exchanger of the hot water supply circulation circuit only when the hot water judging means judges that there is hot water / water in the bathtub. It is a thing.

  And since one heating path is formed by the heat exchanger for hot water supply and the heat exchanger for latent heat recovery, and the amount of heat is supplied to the heating circuit or bath circuit using the circulating water of the heating path, the hot water supply It is possible to configure a heat exchanger on the use side that is not related to a heat exchanger for heat recovery or a heat exchanger for latent heat recovery. By using a hot water supply circuit as a main component, it is possible to provide an easy-to-use hot water supply device that prioritizes hot water supply performance. It is possible to provide a hot water supply device that is improved in safety.

When there is no remaining hot water in the bathtub, by the bath heat exchanger off valve is closed, if there is not enough circulation flow rate by clogging the circulation circuit or if the bathtub there are no remaining hot water in the bathtub is Safety can be improved without emptying the bathtub side.

According to a second aspect of the present invention, there is provided a hot water solenoid valve for pouring hot water into the bathtub between the hot water outlet and the bath circuit of the bath heat exchanger, and when hot water is poured into the hot water bath, It is limited to a hot water supply device provided with a bath heat exchanger on / off pouring judgment means for closing the on / off valve of the exchanger, and the hot water in the pouring to the bathtub is not reheated by the bath heat exchanger. Thus, hot water temperature control during pouring can be simplified.

According to a third aspect of the present invention, there is provided a water level sensor for detecting the water level in the bathtub on the bath return pipe side, and the bath heat exchanger for closing the on-off valve of the bath heat exchanger of the hot water supply circulation circuit when detecting the water level of the bathtub The water level is limited to the hot water supply device provided with a means for detecting the open / closed bathtub water level, and detects the water level in the bathtub without heating the bath heat exchanger even when operated as a heat exchanger on the use side. The water level in the bathtub can always be accurately detected without affecting the sensor.

According to a fourth aspect of the present invention, when the heating heat exchanger and the bath heat exchanger are used simultaneously as the utilization heat exchanger, the bath heat exchanger depends on the output of the hot water circulation pump of the hot water circulation circuit. By using a hot water supply device provided with a bath heat exchanger on / off valve circulation pump judgment means that controls the on / off valve of the hot water, when heating operation is performed as a use side heat exchanger, heating heat exchange is performed according to the output of the hot water supply circulation pump When a large load on the heater side is required, the heating capacity can be improved by duty-controlling the bath heat exchanger on / off valve.

According to a fifth aspect of the present invention, a heat exchange temperature detecting means for detecting a heating temperature of water supplied from a water supply path by combustion of a burner is provided in the hot water supply circulation circuit, and the heat for bath is set according to the heat exchange temperature of the hot water supply circulation circuit. This is a hot water supply device equipped with a heat exchanger temperature judgment means for bath heat exchanger on / off valve that controls the on / off valve of the exchanger, and opens the bath heat exchanger on / off valve if the temperature in the hot water circulation circuit does not detect a predetermined temperature or higher. By not having this, the efficiency of the bath heat exchanger can be improved, and even when the chasing operation and the use of the hot water tap 6 overlap, it can be realized without impairing the hot water temperature characteristic of the hot water tap 6.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 shows a structural diagram of a hot water supply apparatus according to a first embodiment of the present invention.

In FIG. 1, first, water supplied from a water supply channel 1 is heated by combustion of a burner 2 and rises to a predetermined temperature, and then supplied to a tapping channel, and is a primary heat exchanger 18 for heating that is a use side heat exchanger. After passing through the side path, the hot water supply circulation circuit 19 is formed by joining again to the water supply path 1 via the circulation pump 17. Then, a hot water supply path 3 is formed by branching from the hot water supply circulation circuit 19 after passing through the heating heat exchanger 18, and from the water supply path 1 from the bypass passage 4 formed by connecting the hot water supply path 3 and the water supply path 1. By supplying a part of the supplied water through the bypass control valve 5, the hot water is adjusted to a desired hot water and discharged from the hot water tap 6.

  Here, the burner 2 is supplied with fuel from a gas supply passage 10 provided with a gas source solenoid valve 7, a gas proportional valve 8, and a gas switching valve 9, and supplied with combustion air from a combustion fan 11, in advance. A combustion operation is performed according to a predetermined sequence. Then, the combustion gas generated by the combustion of the burner 2 passes through the combustion chamber 12, passes through the exhaust passage 13, and is discharged out of the instrument from the exhaust port 14.

  A hot water supply heat exchanger 15 that recovers sensible heat of the combustion gas and a latent heat recovery heat exchanger 16 that recovers the latent heat of the combustion exhaust gas are disposed in the exhaust path of the combustion gas. Specifically, a hot water supply heat exchanger 15 is provided in the downstream combustion chamber 12 of the burner 2, a latent heat recovery heat exchanger 16 is provided in the downstream exhaust passage 13, and water supplied from the water supply passage 1 is supplied. First, the heat is supplied to the latent heat recovery heat exchanger 16 to recover the latent heat in the combustion exhaust gas, and then supplied to the hot water supply heat exchanger 15 to be heated to a predetermined high temperature water by combustion of the burner 2 and supplied to the hot water outlet 3. . Thus, in addition to heat recovery by the conventional hot water supply heat exchanger 15, by providing the latent heat recovery heat exchanger 16 for recovering the latent heat of the combustion exhaust gas, the overall thermal efficiency is improved and energy saving is achieved.

  The heating circuit 20 is connected to a load such as a radiator 21 on the secondary side of the heating heat exchanger 18 to form a closed circuit, and is circulated by the heating circulation pump 22, whereby the heating heat exchanger 18. Thus, heat is exchanged with the high-temperature water supplied from the hot water supply circuit 19 so as to ensure the amount of heating heat.

  About the combustion apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, at the time of hot water supply operation, when the hot water tap 6 is opened, the water supply side flow rate sensor 23 disposed in the water supply passage 1 detects water flow, and the combustion fan 11 is operated by this water flow signal and simultaneously the gas source solenoid valve 7, The gas proportional valve 8 is opened, fuel and combustion air are supplied to the burner 2, and combustion is started by an ignition operation. Combustion gas generated by the start of combustion of the burner 2 is discharged from the exhaust port 14 via the exhaust passage 13 from the combustion chamber 12. In the process of exhausting the combustion gas, the water supplied from the water supply passage 1 is heated by the hot water supply heat exchanger 15 disposed in the combustion chamber 12 and the latent heat recovery heat exchanger 16 disposed in the exhaust passage 13. .

  Hot water heated by the hot water supply heat exchanger 15 passes through a bypass passage 4 provided in communication between the water supply passage 1 and the hot water supply passage 3 so as to bypass the hot water supply heat exchanger 15 and the latent heat recovery heat exchanger 16. The bypass control valve 5 is mixed with the water on the incoming side. The opening of the bypass control valve 5 is adjusted by a signal from the hot water thermistor 25 so that the mixed hot water reaches a hot water supply set temperature set by the remote control remote controller 24, and hot water is supplied from the hot water tap 6 through the hot water connection port 26. .

  Thus, when selecting the hot water supply independent operation, the hot water set automatically can be secured by setting a desired temperature with the remote control remote controller 24 and opening the hot water tap 6.

  Next, at the time of heating operation, the heating circulation pump 22 provided in the heating circuit 20 is driven by an operation command of a controller (not shown) built in the heating terminal device such as the radiator 21, and the operation command is linked. Then, the circulation pump 17 for circulating the hot water in the hot water supply circulation circuit 19 is driven, and at the same time, combustion is started by the ignition operation of the burner 2. Combustion gas generated by the start of combustion of the burner 2 is discharged from the exhaust port 14 via the exhaust passage 13 from the combustion chamber 12. In the process of exhausting the combustion gas, the water supplied from the water supply passage 1 is heated by the hot water supply heat exchanger 15 disposed in the combustion chamber 12 and the latent heat recovery heat exchanger 16 disposed in the exhaust passage 13. .

Hot water heated by the hot water supply heat exchanger 15 circulates in the hot water supply circulation circuit 19 through the primary side path of the heating heat exchanger 18 by the circulation pump 17, and heat is exchanged by the water-water heat exchange configuration for heating. Heat is transferred to the circuit 20. Heat of the heating circuit 20 received by the heating heat exchanger 18 is radiated as warm air by the radiator 21. And the high temperature water heat-exchanged with the heat exchanger 18 for heating returns to the upstream water supply path 1 of the heat exchanger 16 for latent heat collection | recovery, forms the hot-water supply circulation circuit 19, and issues the heating operation command from the radiator 21 While it is being circulated, it is maintained at a predetermined hot water temperature and continues to circulate.

  In this way, the hot water supply path 3 is branched from the hot water supply circulation circuit 19 after passing through the heating heat exchanger 18 that is a use side heat exchanger, thereby securing high-temperature water necessary for the heating operation. The hot water supply priority operation that can adjust and supply hot water in a wide range from high temperature water to low temperature water to the hot water supply circuit can be ensured.

  Here, the latent heat recovery heat exchanger 16 that recovers the latent heat of the combustion exhaust gas is located downstream of the hot water supply heat exchanger 15 with respect to the exhaust gas path, and is upstream of the hot water supply heat exchanger 15 with respect to the water supply path. The hot water remaining in the latent heat recovery heat exchanger 16 is heated by the hot water supply heat exchanger 15. As a result, the amount of heat generated by the combustion of the burner 2 can be efficiently exchanged, leading to energy saving.

  As a use side heat exchanger, a heat exchanger for heating that supplies heat to a heating circuit having a radiator 21 that performs heating, bathroom drying, and the like, and heat exchange for bath that supplies heat to a bath circuit that retreats the bath The present invention relates to a hot water supply device that uses a water heater. The heat exchanger 18 for heating and the heat exchanger 27 for bath 27 are connected in parallel to the hot water supply circulation circuit 19, and the high-temperature water heated by the latent heat recovery heat exchanger 16 and the hot water supply heat exchanger 15 is circulated by the circulation pump 17. Then, heat is exchanged to supply heat to the heating circuit 20 or the bath circuit 28.

  Next, the operation and action will be described. During the heating operation, the heating pump 22 provided in the heating circuit 20 is driven by the operation command of the radiator 21, and the pump 17 that circulates the hot water in the hot water supply circulation circuit 19 in conjunction with it. The warm water heated by the hot water supply heat exchanger 15 that ignites the burner 2 by driving and collects the burned heat is heat-exchanged by the heating heat exchanger 18 and transferred to the heating circuit 20. Heat of the heating circuit 20 received by the heating heat exchanger 18 is radiated as warm air by the radiator 21.

  Further, during bath operation, when the bath circulation pump 29 provided in the bath circuit 28 is driven by the operation command of the remote control remote controller 24 and the circulation is detected by the water flow detection unit 30, the hot water supply circulation circuit 19 is interlocked. When the pump 17 that circulates the hot water is driven, the burner 2 is ignited, and the hot water heated by the hot water heat exchanger 15 that recovers the burned heat is heat-exchanged by the bath heat exchanger 27 and the bath circuit 28 Heat is transferred to. The heat of the bath circuit 28 received by the bath heat exchanger 27 is circulated to the bathtub 31 and reheated.

  Further, during heating and bath simultaneous operation, the heating circuits 20 and the pumps 22 and 29 of the bath circuit 28 are driven by the operation commands from the radiator 21 and the remote control remote controller 24, and combustion is started by the ignition operation of the burner 2. By this combustion, the circulating water in the hot water supply circuit 19 is heated by the latent heat recovery heat exchanger 16 and the hot water heat exchanger 15 and circulates while maintaining a predetermined high-temperature water state. This high-temperature circulating water is supplied to the heating heat exchanger 18 and the bath heat exchanger 27 at substantially the same temperature, and is transferred to the heating circuit 20 and the bath circuit 28.

  Also, simultaneous operation by combinations other than the above is possible, and the heat exchanger 18 for heating and the heat exchanger 27 for bath 27 are configured in parallel with the hot water supply circulation circuit 19, so that the passage resistance of the circulation circuit is reduced. Therefore, the circulation pump 17 can be reduced in size and weight.

In this way, by using a configuration in which the hot water supply path 3 is branched from the hot water supply circulation circuit 19 after passing through the heating heat exchanger 18 and the bath heat exchanger 27 that are the use side heat exchangers, Hot water supply priority operation that can adjust and supply a wide range of hot water from high temperature water to low temperature water to the hot water supply circuit while ensuring high temperature water necessary for operation can be ensured, and the bath heat exchanger side By providing the bath opening / closing valve 34, it is possible to provide a hot water supply device that is improved in heating capability and safety in a single heating operation.

  Further, the bath circulation pump 29 provided in the bath circuit 28 is driven by the operation command of the remote control 24 for remote operation, and the water flow detector 30 detects the circulation in the bath heat exchanger open / close bathtub remaining hot water determination means. If there is no remaining hot water in the bathtub by providing a bath opening / closing valve 34 in the case, the bath heat exchanger on / off valve 34 is closed, so that there is no remaining hot water in the bathtub 31 or in the circulation circuit of the bathtub. When there is no sufficient circulation flow due to clogging or the like, safety can be improved without emptying the bathtub 31.

  In addition, when filling the bathtub 31 with the operation command of the remote control 24 for remote operation, the hot water solenoid valve 35 is opened, and the hot water heated by the hot water supply heat exchanger 15 is supplied via the bath circuit 28 to the bathtub 31. Fill with water. At this time, the hot water heated by the hot water supply heat exchanger 15 passes through the bath heat exchanger 27, and when the bath heat exchanger 27 is heated, hot water poured into the bathtub 31 is poured. Heating is performed twice by the hot water supply heat exchanger 15 and the bath heat exchanger 27, and the temperature control becomes complicated. Therefore, when the hot water solenoid valve 35 is opened and poured, the bath heat exchanger on / off valve 34 is closed to provide a bath heat exchanger on / off pouring determination means so that the hot water to be poured into the bathtub 31 is supplied. The hot water temperature control at the time of pouring can be simplified without heating twice by the heat exchanger 15 for bath and the heat exchanger 27 for bath.

  Further, when filling the bathtub 31 with the operation command of the remote control 24 for remote operation, the hot water solenoid valve 35 is opened and whether or not the water has been filled up to the set water level of the remote control remote control 24 is returned to the bath. The water level in the bathtub 31 is detected by a water level sensor 36 that detects the water level in the bathtub on the piping side.

  Moreover, it is necessary to monitor the water level of the bathtub 31 during the bathtub heat insulation mode. When the hot water tap 6 is used in the previous period, the hot water heat exchanger is heated and the hot water circulation circuit is also heated, so that the bath heat exchanger 27 is also heated. When the bath heat exchanger 27 is heated, the bath circuit 28 is also affected by the temperature and a convection phenomenon occurs. When a convection phenomenon occurs, the water level sensor 36 that detects the water level in the bathtub on the bath return pipe side cannot accurately detect the water level in the bathtub 31. Therefore, when detecting the water level of the bathtub, there is provided a bath heat exchanger open / close bathtub water level detection judging means for closing the on-off valve of the bath heat exchanger 34 of the hot water supply circulation circuit, and the bath heat exchanger is not heated so that the bath heat exchanger is not heated. The water level in the bathtub 31 can always be accurately detected without affecting the water level sensor 36 that detects the water level. In addition, the same effect can be obtained during heating operation in this system.

  In addition, when the heating operation by the operation of the radiator 21 and the chasing operation for boiling the hot water in the bathtub 31 by the operation command of the remote control 24 are overlapped, and a load due to the heating operation is necessary, By raising the output voltage of the circulating pump 17 and increasing the circulating flow rate in the hot water supply circulation circuit 19, the output voltage of the hot water circulating pump 17 is determined by the bath heat exchanger on / off valve circulating pump determining means, and the heating load is In many cases, the on / off control (duty control) of the bath heat exchanger on / off valve 34 is performed to lower the output of the bath heat exchanger 27, so that the chasing operation is not stopped and heating is performed at the time of high load heating operation. You can give the side the necessary abilities.

Further, when performing a follow-up operation in which the hot water in the bathtub 31 is boiled by the operation command of the remote control 24 for remote operation, the heat for detecting the heat exchange temperature at the outlet of the hot water supply heat exchanger 15 in the hot water supply circulation circuit 19. When the output temperature in the hot water supply circulation circuit 19 exceeds a certain temperature, the bath heat exchanger on / off valve opens the bath heat exchanger on / off valve 34 by the bath heat exchanger on / off valve 34. The efficiency of the heat exchanger can be improved, and a stable tapping temperature can be provided on the hot water tap 6 side without lowering the hot water temperature even when the chasing operation and the use of the hot water tap 6 overlap.

  As described above, the hot water supply apparatus according to the present invention has hot water supply and heating, or hot water and bath, or hot water and heating and bath with a single circulation path as a heat source, and the presence or absence of hot water in the circulation path. After confirming the above, by controlling the combustion operation of the burner, it is possible to reliably prevent the air-burning operation, and by providing an on-off valve on the side of the bath heat exchanger, the heating capacity can be improved during single heating operation. It is possible to reduce the size and weight of the equipment, ensure sufficient installation space, improve workability, and provide a latent heat recovery heat exchanger to achieve high efficiency and save energy by reducing running costs. Therefore, the present invention can be applied to uses such as gas and oil hot water bath devices and hot water heaters.

Structure diagram of hot water supply apparatus in Embodiment 1 of the present invention

Explanation of symbols

1 Water supply path 2 Burner (heating means)
3 Hot water supply passage 13 Exhaust passage (exhaust heat passage)
DESCRIPTION OF SYMBOLS 15 Heat exchanger for hot water supply 16 Heat exchanger for latent heat recovery 17 Circulation pump for hot water supply 18 Heat exchanger for heating (use side heat exchanger)
DESCRIPTION OF SYMBOLS 19 Hot water supply circulation circuit 20 Heating circuit 21 Radiator 22 Circulation pump 23 for heating 23 Water side flow sensor 27 Heat exchanger for baths (use side heat exchanger)
28 Bath Circuit 29 Bath Circulation Pump 31 Bathtub 33 Hot Water Supply Flow Sensor 34 Bath Open / Close Valve 35 Pouring Solenoid Valve 36 Water Level Sensor 37 Hot Water Circulation Pump

Claims (5)

The water supplied from the water supply passage is heated by combustion of the burner and supplied to the hot water supply passage through the latent heat recovery heat exchanger and the hot water supply heat exchanger, and again to the hot water supply heat exchanger through the hot water circulation pump. A heat exchanger for heating that supplies heat to the heating circuit having a heating device that forms a hot water supply circulation circuit and performs heating, bathroom drying, etc., and heat for the bath that supplies heat to the bath circuit that retreats the bath An exchanger is provided so that it is possible to select hot water supply or heating or bath reheating alone, or at least two simultaneous use of hot water supply and heating and bath reheating, and the heat exchanger for heating or heat exchange for bath Branch from the hot water circulation circuit via the heater to form a hot water supply circuit for currant or bath pouring, and branch to the hot water circuit after passing through the heat exchanger for heating or the heat exchanger for bath A water heater having a flow rate sensor in the hot water supply circulation circuit,
Enables switching of hot water supply to the heat exchanger for bath, and the on / off valve of the heat exchanger for bath of the hot water supply circulation circuit, separately from the hot water supply circulation circuit on the side of the heat exchanger for bath, from the hot water supply device Bath flow piping to be connected to the bathtub, bath return piping from the bathtub to the hot water supply device, a bath circulation pump on the bath return piping side, a flow SW for detecting whether there is hot water or water in the bathtub, and the flow SW Bath remaining hot water determining means for determining whether there is hot water or water in the bathtub and the bath of the hot water supply circulation circuit only when it is determined that there is hot water or water in the bathtub by the previous-term bathtub remaining hot water determining means A hot water supply apparatus comprising: a bath heat exchanger on / off bathtub remaining hot water determination means for opening the on-off valve of the heat exchanger for use . A hot water solenoid valve for pouring water into the bathtub is provided between the hot water passage and the bath circuit of the bath heat exchanger, and when the hot water is poured into the bathtub, the on / off valve of the bath heat exchanger of the hot water supply circulation circuit is provided. The hot water supply apparatus according to claim 1, further comprising a bath heat exchanger for closing and closing pouring determination means. A water level sensor that detects the water level in the bathtub is provided on the bath return pipe side, and when the water level of the bathtub is detected, the on / off valve of the bath heat exchanger in the hot water circulation circuit is closed. The hot water supply apparatus according to claim 2 , further comprising means. When simultaneously using a heating heat exchanger and a bath heat exchanger as the utilization heat exchangers, the on / off valves of the bath heat exchanger are controlled according to the output of the hot water circulation pump of the hot water circulation circuit. The hot-water supply apparatus of Claim 1 or 2 provided with the bath heat exchanger on-off valve circulation pump determination means to perform. A heat exchange temperature detecting means for detecting the heating temperature of the water supplied from the water supply path by combustion of the burner is provided in the hot water supply circulation circuit, and the on / off valve of the heat exchanger for bath is provided according to the heat exchange temperature of the hot water supply circulation circuit. The hot-water supply apparatus of Claim 1 or 2 provided with the bath heat exchanger on-off valve heat exchanger temperature determination means to perform control.

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