JP2006317065A - Hot water supply apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain miniaturization, weight reduction and high efficiency of instruments by using a single heat source for hot water supply, heating and bath by a combination of a heat exchanger for hot water supply and a heat exchanger for latent heat recovery. <P>SOLUTION: This hot water supply apparatus comprises the heat exchanger 15 for hot water supply and the heat exchanger 16 for latent heat recovery. The heat exchanger 15 and the heat exchanger 16 are connected in series to form a hot water supply circuit extending from a water supply line 1 to a hot water discharge line 3 via the heat exchanger 16, the heat exchanger 15 and a utilization side heat exchanger 18 and to form a hot water supply circulating circuit 19 branched from downstream of the utilization side heat exchanger 18 on the hot water discharge line 3 to return hot water to the heat exchanger 16 through a circulating pump 17 and extending from the heat exchanger 16 to the utilization side heat exchanger 18 through the heat exchanger 15. The use of the hot water supply circuit, the use of the hot water supply circulating circuit, or the simultaneous use of the hot water supply circuit and hot water supply circulating circuit can be selected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hot water supply heat exchanger that is heated by combustion heat of a burner, and a hot water supply device that includes a latent heat recovery heat exchanger that recovers latent heat of combustion exhaust gas, and in particular, the hot water supply heat exchanger and latent heat recovery heat exchange. The present invention relates to a hot water supply apparatus provided with a hot water supply circulation circuit for circulating hot water heated by a heater.

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. And a hot water supply device in which the latent heat heat exchange part for hot water supply and the latent heat heat exchange part for fluid are integrally formed in a state of conducting heat to each other are disclosed (for example, see Patent Document 1). .
JP 2002-267262 A

  However, in the conventional hot water supply apparatus, a hot water heat exchanger and a fluid heat exchanger are respectively arranged in the flow path of the combustion gas of the burner, and a sensible heat exchanger for hot water supply and a hot water supply are provided in the hot water heat exchanger. And a fluid sensible heat exchange section and a fluid latent heat exchange section are provided in the fluid heat exchanger, so that hot water is supplied to the sensible heat exchange section and the latent heat exchange section respectively. Therefore, the heat exchanger for fluid and the heat exchanger for fluid need to be formed integrally, and a very complicated configuration has been imposed as a heat exchanger for hot water supply and a heat exchanger for fluid.

  In addition, since two paths for hot water supply and fluid are formed as the paths heated by the burner, the piping configuration becomes complicated and the boiling of the residual water in the heat exchanger on the shutdown side during single operation It has a problem of generating.

  The present invention solves the above-described conventional problems, and forms a single heating path with a hot water supply heat exchanger and a latent heat recovery heat exchanger, and uses a circulating water in the heating path to reheat a heating circuit and a bath. By adopting a configuration for supplying heat to the circuit, it is possible to configure a use-side heat exchanger not related to the hot water supply heat exchanger or latent heat recovery heat exchanger, and to simplify the main body configuration including the piping configuration. The heating path is mainly a hot water supply circuit, and the hot water supply circuit is operated independently, and the hot water supply circuit and the hot water supply circulation circuit are simultaneously passed through the use-side heat exchanger. Provided is an easy-to-use hot water supply apparatus that suppresses fluctuations in the water flow rate of the use side heat exchanger from the same time alone and prioritizes hot water supply performance while also considering the use side heat exchanger. In addition, by using a single heating path configuration mainly consisting of a hot water supply circuit, a hot water supply device is provided that eliminates the problem of residual water boiling in the heat exchanger during single operation and is highly efficient and reduces running costs. The purpose is to do.

  In order to solve the above-mentioned conventional problems, a hot water supply apparatus of the present invention includes a hot water supply heat exchanger that heats water supplied from a water supply channel by combustion of a burner and supplies hot water to a hot water supply channel, and combustion exhaust gas of the burner A latent heat recovery heat exchanger disposed in the path for recovering the latent heat of the combustion exhaust gas, and connecting the hot water supply heat exchanger and the latent heat recovery heat exchanger in series to exchange heat for latent heat recovery from the water supply channel A hot water supply circuit that passes through the heat exchanger and passes through the use side heat exchanger to the hot water outlet, branches off from the hot water supply circuit on the downstream side of the use side heat exchanger, and returns to the latent heat recovery heat exchanger via a circulation pump. Forming a hot water supply circulation circuit from the latent heat recovery heat exchanger through the hot water supply heat exchanger to the use side heat exchanger, using the hot water supply circuit, using the hot water supply circulation circuit, or hot water supply Whether to use the circuit and hot water circulation circuit It is obtained by allowing select.

  Thus, a heating path is formed by the hot water supply heat exchanger and the latent heat recovery heat exchanger, and heat is supplied to the heating circuit and the bath reheating circuit using the circulating water of the heating path. , Enabling the configuration of the use side heat exchanger not related to the heat exchanger for hot water supply and the heat exchanger for recovering latent heat, realizing the downsizing and weight reduction of the appliance by simplifying the main body configuration including the piping configuration, The heating path is mainly a hot water supply circuit, and the hot water supply circuit is operated independently, and the hot water supply circuit and the hot water supply circulation circuit are simultaneously passed through the use side heat exchanger, so that the use side heat exchanger can be passed from the same time or simultaneously. It is possible to provide an easy-to-use hot water supply device that suppresses fluctuations in the water flow rate and prioritizes hot water supply performance and also takes into consideration the use side heat exchanger, and has a single heating path configuration mainly composed of a hot water supply circuit. So As well as eliminate the remaining water boiling problems in the heat exchanger during operation, it is possible to provide a water heater which thereby reducing the running cost with high efficiency.

  The hot water supply apparatus of the present invention forms one heating path with a hot water supply heat exchanger and a latent heat recovery heat exchanger, and supplies heat to a heating circuit or a bath reheating circuit using the circulating water of the heating path. By adopting a configuration, it is possible to configure a heat exchanger on the use side that is not related to the heat exchanger for hot water supply or the heat exchanger for recovering latent heat. In addition, the heating path is mainly composed of a hot water supply circuit, the hot water supply circuit is operated independently, and the hot water supply circuit and the hot water supply circulation circuit are simultaneously used via a use-side heat exchanger, so that they can be used independently or simultaneously. It is possible to provide an easy-to-use hot water supply apparatus that suppresses fluctuations in the side heat exchanger water flow rate, gives priority to hot water supply performance, and also takes into account the use side heat exchanger.

  In addition, by using a single heating path configuration mainly consisting of a hot water supply circuit, a hot water supply device is provided that eliminates the problem of residual water boiling in the heat exchanger during single operation and is highly efficient and reduces running costs. can do.

  A first aspect of the present invention is a heat exchanger for hot water supply that heats water supplied from a water supply channel by combustion of a burner and supplies hot water to a hot water supply channel, and recovers the latent heat of the combustion exhaust gas disposed in the combustion exhaust gas path of the burner. A heat exchanger for recovering latent heat, and connecting the heat exchanger for hot water supply and the heat exchanger for recovering latent heat in series, passing through the water supply passage through the heat exchanger for recovering latent heat and the heat exchanger for hot water supply, A hot water supply circuit that leads to the hot water outlet via the side heat exchanger, branches off from the hot water supply circuit on the downstream side of the use side heat exchanger, and returns to the latent heat recovery heat exchanger via a circulation pump, and the latent heat recovery heat A hot water supply circulation circuit from the exchanger through the hot water supply heat exchanger to the use side heat exchanger is formed, the hot water supply circuit is used, the hot water supply circulation circuit is used, or the hot water supply circuit and the hot water supply circulation circuit are used. Can be used at the same time or The heat exchanger for hot water supply and the heat exchanger for latent heat recovery form one heating path, and heat is supplied to the heating circuit and bath reheating circuit using the circulating water of the heating path. By adopting the configuration, it is possible to configure the use-side heat exchanger not related to the hot water supply heat exchanger or latent heat recovery heat exchanger, and the size and weight of the appliance can be reduced by simplifying the main body configuration including the piping configuration. While the heating path is mainly a hot water supply circuit, the hot water supply circuit is operated independently, and the hot water supply circuit and the hot water supply circulation circuit are simultaneously passed through the use side heat exchanger, so that they can be used independently or simultaneously. It is possible to provide an easy-to-use hot water supply device that takes into account the use-side heat exchanger while suppressing fluctuations in the water flow rate of the use-side heat exchanger and giving priority to hot water supply performance. One heating path configuration This eliminates the problem of residual water boiling in the heat exchanger during single operation, facilitates the structure for improving the corrosion resistance of the latent heat recovery heat exchanger, and achieves high efficiency and reduced running costs. Can be provided.

  2nd invention is used as a heat exchanger for heating which supplies a heat quantity to a heating circuit which has a heating device which performs heating, bath drying, etc. as a use side heat exchanger, and uses hot water supply or heating alone, or hot water supply and heating Hot water supply device configured to perform hot water supply and heating using a hot water circulation circuit composed of a hot water supply heat exchanger and a latent heat recovery heat exchanger. By configuring the hot water supply and heating with a single heating path, the main body structure including the piping structure can be simplified to reduce the size and weight of the appliance, and to improve the efficiency by collecting latent heat. Therefore, hot water supply performance and heating performance can be secured at the same time.

  The third invention is used as a heat exchanger for a bath that supplies heat to a bath circuit that retreats a bath as a use-side heat exchanger, and uses either hot water or bath reheating alone, or hot water and bath reheating. Hot water supply that is configured to perform hot water supply and bath replenishment using a hot water circulation circuit consisting of a hot water supply heat exchanger and a latent heat recovery heat exchanger. The system is limited to equipment, and hot water supply and bath chase are configured with a single heating path, which reduces the size and weight of the equipment by simplifying the main body configuration including the piping configuration, and improves the efficiency by collecting latent heat. By improving the temperature, it is possible to ensure both hot water supply performance and bath reheating performance at the same time.

  4th invention supplies heat quantity to the heat circuit for heating which supplies a heat quantity to the heating circuit which has a heating device which performs heating, bath drying, etc. as a use side heat exchanger, and the bath circuit which retreats a bath A heat exchanger for bath is provided, and it is possible to select a single use of hot water supply or heating or bath reheating, or at least two simultaneous use of hot water supply and heating and reheating bath, It is limited to hot water supply devices that are configured to perform hot water supply, heating, and bath reheating using a hot water supply circulation circuit that consists of a heat exchanger for hot water supply and a heat exchanger for recovering latent heat. By using a single heating path, it is possible to reduce the size and weight of the equipment by simplifying the main body structure including the piping structure, and to improve the efficiency by recovering latent heat, thereby improving hot water supply performance, heating performance, and wind. Reheating performance can be secured simultaneously.

  In the fifth aspect of the present invention, when a plurality of use side heat exchangers are provided, the heat exchangers are connected in parallel to the hot water supply circulation circuit so that the hot water temperatures supplied from the hot water supply heat exchangers are substantially the same. A hot water supply circulation circuit by connecting a plurality of use side heat exchangers in parallel to a hot water supply circulation circuit composed of a hot water supply heat exchanger and a latent heat recovery heat exchanger. Therefore, the circulation pump can be made smaller and lighter.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the 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 path 1 is heated by combustion of a burner 2 to rise to a predetermined temperature, then supplied to a hot water supply path 3, and the water supply path 1 and the hot water supply path 3 are formed in communication with each other. A part of water supplied from the water supply channel 1 from the bypass passage 4 is supplied through the bypass control valve 5 to adjust to a desired hot water, and a hot water supply circuit for discharging hot water from the hot water tap 6 is configured.

  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.

  Next, the hot water supply circulation circuit 19 supplies the high temperature water heated by the latent heat recovery heat exchanger 16 and the hot water supply heat exchanger 15 to the heating heat exchanger 18 which is the use side heat exchanger, and then the outlet hot water path. 3, and returns to the upstream water supply path 1 of the latent heat recovery heat exchanger 16 through the circulation pump 17, and passes from the latent heat recovery heat exchanger 16 through the hot water supply heat exchanger 15 to the heating heat exchanger 18. A closed circuit is formed. The hot water supply circulation circuit 19 can supply heat to the use-side load by using high-temperature hot water heated by the burner 2, and is optimal for use in the heating circuit described in the present embodiment. .

  The heating circuit 20 forms a closed circuit by connecting a load such as a radiator 21 to the secondary side of the heating heat exchanger 18, and circulates it by the heating pump 22. Heat is exchanged with the high-temperature water supplied from the hot water supply circulation circuit 19 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, a heating 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 in conjunction with this operation command. A circulation pump 17 for circulating 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. .

  The hot water heated by the hot water supply heat exchanger 15 is supplied to the heating heat exchanger 18, and is heat-exchanged by the water-water heat exchange configuration and transferred to the heating circuit 20. Heat of the heating circuit 20 received by the heating heat exchanger 20 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 via the circulation pump 17, forms the hot water supply circulation circuit 19, and from the radiator 21 While the heating operation command is issued, the circulation is continued while maintaining a predetermined hot water temperature.

  In this way, the hot water supply circuit 19 is formed by branching the hot water supplied to the heating heat exchanger 18 from the hot water supply path 3 constituting the hot water supply circuit and returning it to the upstream water supply path 1 of the latent heat recovery heat exchanger 16. Thus, 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 while securing high temperature water necessary for heating operation.

  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 heated by 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 described above, in the present embodiment, one heating path is formed by the hot water supply heat exchanger 15 and the latent heat recovery heat exchanger 16, and the use side load circuit utilizes the circulating water of the heating path. Since the heat amount is supplied to the heating circuit 20, it is possible to configure the heating heat exchanger 18 that is a use side heat exchanger not related to the hot water supply heat exchanger 15 and the latent heat recovery heat exchanger 16. The simplification of the main body configuration including the piping configuration realizes downsizing and weight reduction of the equipment, and the heating path is mainly made up of the hot water supply circuit, giving priority to hot water supply performance and considering the use side heat exchanger. An easy-to-use hot water supply device can be provided, and by using a single heating path configuration mainly consisting of a hot water supply circuit, the problem of residual water boiling in the heat exchanger during single operation can be solved and latent heat recovery can be achieved. Heat exchanger 16 To facilitate the configuration for improving corrosion resistance, it is possible to provide a water heater which thereby reducing the running cost with high efficiency.

(Embodiment 2)
FIG. 2 is a structural diagram of a hot water supply apparatus according to the second embodiment of the present invention.

  This embodiment relates to a hot water supply apparatus using a bath heat exchanger that supplies heat to a bath circuit that performs reheating of the bath as a use-side heat exchanger of the hot water supply apparatus in the first embodiment. . In addition, the thing of the same code | symbol as 1st Embodiment has the same structure, and abbreviate | omits description.

  The bath heat exchanger 27 is connected to the hot water supply circulation circuit 19, and heat is exchanged while circulating the high-temperature water heated by the latent heat recovery heat exchanger 16 and the hot water supply heat exchanger 15 by the circulation pump 17, and the bath reheating circuit. The amount of heat is supplied to 28. The bath reheating circuit 28 replenishes the bath water by supplying the hot water in the bath 31 to the bath heat exchanger 27 through the bath pump 29 and the water amount detection unit 30 and circulating it for a predetermined time. In addition, as the pouring circuit 32 for filling the bathtub 31 with water, a path is formed which communicates from the hot water outlet 3 on the downstream side of the bypass passage 4 to the bath reheating circuit 28.

  Next, the operation and action will be described. When bath operation is instructed by the remote control remote controller 24 during bath operation, the bath pump 29 provided in the bath reheating circuit 28 is driven and the water flow detection unit 30 performs bath water. When the circulation is detected, the circulation pump 17 that circulates the hot water in the hot water supply circulation circuit 19 is driven by the detection signal, 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. .

  The hot water heated by the hot water supply heat exchanger 15 is supplied to the bath heat exchanger 27, and is heat-exchanged by the water-water heat exchange configuration and transferred to the bath reheating circuit 28. The heat of the bath reheating circuit 28 received by the bath heat exchanger 27 raises the hot water temperature of the bathtub 31 to ensure a predetermined reheating water temperature. The high-temperature water heat-exchanged by the bath heat exchanger 27 is returned to the upstream water supply channel 1 of the latent heat recovery heat exchanger 16 by the circulation pump 17 to form a hot water supply circulation circuit 19, and the remote control remote controller 24 is used. Circulation is continued while maintaining a predetermined hot water temperature until a predetermined reheating condition set is satisfied.

  In this way, the hot water supply circuit 19 is formed by branching the hot water supplied to the bath heat exchanger 27 from the hot water supply path 3 constituting the hot water supply circuit and returning it to the upstream water supply path 1 of the latent heat recovery heat exchanger 16. Therefore, it is possible to ensure hot water supply priority operation capable of adjusting and supplying hot water in a wide range from high temperature water to low temperature water to the hot water supply circuit while securing high temperature water necessary for the bath chasing operation. .

  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 heated by 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 even during the bath chasing operation, leading to energy saving.

  As described above, in the present embodiment, the hot water supply and the bath reheating are configured by one heating path, thereby realizing a reduction in the size and weight of the appliance by simplifying the main body configuration including the piping configuration, and latent heat. By improving efficiency through recovery, it is possible to ensure both hot water supply performance and bath retreat performance at the same time.

(Embodiment 3)
FIG. 3 is a structural diagram of a hot water supply apparatus according to the third embodiment of the present invention.

  This embodiment is a heating heat exchanger that supplies heat to a heating circuit having a radiator 21 that performs heating, bath drying, and the like, as a use-side heat exchanger of the hot water supply apparatus in the first embodiment, and a bath The present invention relates to a hot water supply apparatus using a bath heat exchanger that supplies heat to a bath circuit that performs reheating. In addition, the thing of the same code | symbol as 1st Embodiment has the same structure, and abbreviate | omits description.

  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 reheating 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. The 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 pump 29 provided in the bath circuit 28 is driven by the operation command of the remote control remote controller 24 and circulation is detected by the water flow detection unit 30, hot water in the hot water supply circulation circuit 19 is interlocked. The hot water heated by the hot water supply heat exchanger 15 for igniting the burner 2 and recovering the burned heat is heat-exchanged by the bath heat exchanger 27 and transmitted to the bath circuit 28. Be heated. 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 20 and the bath heat exchanger 27 at substantially the same temperature, and is transferred to the heating circuit 20 and the bath circuit 28.

  Moreover, simultaneous operation by a combination other than the above is possible, and the heat exchanger 20 for heating and the heat exchanger 27 for bath 27 are configured in parallel to 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 forming the hot water supply circulation circuit 19 which branches the hot water supplied to the use side heat exchanger from the hot water supply path 3 constituting the hot water supply circuit and returns it to the upstream water supply path 1 of the latent heat recovery heat exchanger 16. It is possible to secure hot water supply priority operation capable of adjusting and supplying hot water in a wide range from high temperature water to low temperature water to the hot water supply circuit while securing high temperature water necessary for operation of the use side load. it can.

  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 heated by the latent heat recovery heat exchanger 16 is heated by the hot water supply heat exchanger 15. Thereby, the heat quantity generated by the combustion of the burner 2 can be efficiently exchanged even during operation of a plurality of usage-side loads, leading to energy saving.

  The hot water supply apparatus of the present invention can be easily configured in a plurality of usage forms by one heating path, and can be used as a multifunctional heat source machine that prioritizes hot water supply performance.

Structure diagram of hot water supply apparatus in Embodiment 1 of the present invention Structure diagram of hot water supply apparatus in Embodiment 2 of the present invention Structure diagram of hot water supply apparatus in Embodiment 3 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water supply path 2 Burner 3 Hot water supply path 15 Heat exchanger for hot water supply 16 Heat exchanger for latent heat recovery 17 Circulation pump 18 Heat exchanger for heating (use side heat exchanger)
19 Hot water supply circulation circuit 27 Heat exchanger for bath (use side heat exchanger)

Claims (5)

A hot water supply heat exchanger that heats the water supplied from the water supply passage by combustion of the burner and supplies hot water to the hot water supply passage, and heat exchange for latent heat recovery that is arranged in the combustion exhaust gas passage of the burner and recovers the latent heat of the combustion exhaust gas A hot water supply heat exchanger and a latent heat recovery heat exchanger connected in series, passing through the water supply passage through the latent heat recovery heat exchanger, the hot water heat exchanger, and the use side heat exchanger A hot water supply circuit that leads to the hot water outlet is formed, branched from the hot water supply circuit downstream of the use side heat exchanger, returned to the latent heat recovery heat exchanger via a circulation pump, and supplied from the latent heat recovery heat exchanger Whether to form a hot water supply circulation circuit that passes through the heat exchanger to the use side heat exchanger, uses the hot water supply circuit, uses the hot water supply circulation circuit, or uses the hot water supply circuit and the hot water supply circulation circuit at the same time , A hot water heater that can be selected. Used as a heat exchanger for heating that supplies heat to a heating circuit that has a heating device that performs heating, bath drying, etc., as the use-side heat exchanger, and selects either hot water supply or heating alone or simultaneous use of hot water and heating The hot water supply apparatus according to claim 1, which can be made. As a use side heat exchanger, it can be used as a bath heat exchanger that supplies heat to the bath circuit that performs bath renewal, and can select either hot water supply or bath reheating alone, or simultaneous use of hot water and bath reheating The hot water supply apparatus according to claim 1, which is configured as described above. A heat exchanger for heating that supplies heat to a heating circuit having a heating device that performs heating, bath drying, etc. as a use-side heat exchanger, and a heat exchanger for bath that supplies heat to a bath circuit that retreats the bath The hot water supply apparatus according to claim 1, wherein hot water supply or heating or bath reheating can be used alone, or at least two simultaneous use of hot water supply, heating, and bath reheating can be selected. When a plurality of use-side heat exchangers are provided, the heat exchangers are connected in parallel to the hot water supply circulation circuit so that the hot water temperatures supplied from the hot water supply heat exchangers are substantially the same. 4. A hot water supply apparatus according to 4.