JP4501700B2 - Water heater - Google Patents

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 in which a use side heat exchanger is provided in 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 exchanger for hot water supply, and a sensible heat exchanger for hot water supply, which is arranged downstream of the sensible heat exchanger 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 supply heat exchanger and a fluid heat exchanger are arranged in the outflow path of the combustion gas of the hot water supply and the heating burner, respectively, and the sensible heat exchange for hot water supply is performed in the hot water supply heat exchanger. And a latent heat exchange unit for hot water supply, and the fluid heat exchanger is provided with a sensible heat exchange unit for fluid and a latent heat exchange unit for fluid. In addition, it is necessary to integrally form a heat exchanger for hot water supply and a heat exchanger for fluid, respectively, and a very complicated configuration is required as a heat exchanger for hot water supply and a heat exchanger for fluid. 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.

  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 hot water supply apparatus which is easy to use and prioritizes hot water supply performance is provided by making the heating path mainly a hot water supply circuit. In addition, by adopting a single heating path configuration mainly composed of a hot water supply circuit, the configuration for improving the corrosion resistance of the latent heat recovery heat exchanger is solved while solving the problem of residual water boiling in the heat exchanger during single operation. It is an object of the present invention to provide a hot water supply device that is easy and has high efficiency and reduced running costs.

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, the latent heat recovery heat exchanger and the heat exchanger for the hot water supply are connected in series, the latent heat recovery heat from the water supply passage a hot water supply circuit leading to the tapping line via the street the hot water supply heat exchanger exchanger, after supplying to the usage-side heat exchanger via a branch circulating pump from the tapping line, in the latent heat recovery heat exchanger returning the hot water circulation circuit leading to the utilization side heat exchanger via the through the circulation pump heat exchanger for the hot water supply from the latent heat recovery heat exchanger, branches off from the hot water supply circulation circuit connecting said hot water passage a simultaneous passage, channel switching device or the A flow path interrupting device having the same function as the path switching device is provided at a portion where the hot water supply circuit and the hot water supply circulation circuit branch, or at a portion where the simultaneous passage is connected to the hot water supply path, and the flow path switching switching the hot water flow path by operating system or the flow path shut-off device, the hot water supply circuit by its sole use, the simultaneous use of a single use of the hot water supply circulation circuit, or with the hot water supply circuit and the hot water supply circulation circuit Each one can be selected.

  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, By making the heating path mainly a hot water supply circuit, it is possible to provide an easy-to-use hot water supply apparatus that prioritizes hot water supply performance, and by using a single heating path configuration mainly including the hot water supply circuit, Can solve the problem of boiling of residual water in the heat exchanger at the same time, facilitate the structure for improving the corrosion resistance of the heat exchanger for recovering latent heat, and provide a hot water supply device that is highly efficient and reduces running costs. .

  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, it is possible to provide an easy-to-use hot water supply apparatus that prioritizes the hot water supply performance by mainly using the hot water supply circuit as the heating path.

  In addition, by adopting a single heating path configuration mainly composed of a hot water supply circuit, the configuration for improving the corrosion resistance of the latent heat recovery heat exchanger is solved while solving the problem of residual water boiling in the heat exchanger during single operation. It is possible to provide a hot water supply device that is easy and highly efficient with reduced running costs.

A first aspect of the invention is 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 recovers the latent heat of the combustion exhaust gas disposed in the combustion exhaust gas path of the burner. to the latent heat recovery heat exchanger, the latent heat recovery heat exchanger and the hot water supply heat exchanger connected in series, the street the hot water supply heat exchanger the latent heat recovery heat exchanger from the water supply passage a hot water supply circuit leading to the tapping line through, after supplying to the usage-side heat exchanger via a branch circulating pump from the tapping line, back to the latent heat recovery heat exchanger, said from the latent heat recovery heat exchanger a hot water supply circulation circuit leading to the use side heat exchanger hot water supply heat exchanger via the street the circulation pump, branching from the hot water supply circulation circuit has a simultaneous passage connecting the said tapping channel, the channel switching device or A channel blocking device having the same function as the channel switching device. By providing a device at a portion where the hot water supply circuit and the hot water supply circulation circuit branch, or at a portion where the simultaneous passage is connected to the hot water supply passage, and operating the flow passage switching device or the flow passage shut-off device. switching the hot water flow path, and characterized in that to be able to select each of the simultaneous use of a single use, single use of the hot water supply circulation circuit, or with the hot water supply circuit and the hot water supply circulation circuit of the hot water supply circuit by its Is. Thereby, 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 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, By using the heating path mainly for the hot water supply circuit, it is possible to provide an easy-to-use hot water supply apparatus that prioritizes hot water supply performance, and by using a single heating path configuration mainly consisting of the hot water supply circuit, Can solve the problem of residual water boiling in the heat exchanger in the heat exchanger, facilitate the structure for improving the corrosion resistance of the heat exchanger for recovering latent heat, and provide a hot water supply apparatus that is highly efficient and reduces running costs. .

  The second invention has a flow switching device at a contact point connecting the simultaneous passage and the hot water supply passage, and when using the hot water supply circuit, the hot water supply heat passage passes through the latent heat recovery heat exchanger from the water supply passage through the hot water supply heat exchanger. Water is passed only through the hot water supply circuit leading to the road. Thereby, unnecessary heat radiation in the use side heat exchanger can be suppressed by passing water only through the hot water supply circuit.

  3rd invention has a flow-path switching apparatus in the contact which connects the said simultaneous channel | path and the said hot-water channel, and when using a circulation circuit, after branching from a hot-water channel and supplying to a utilization side heat exchanger via a circulation pump, , Returning to the latent heat recovery heat exchanger, and passing water only to the 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 via the circulation pump It is. Thereby, it can suppress that the circulating water by a circulation pump flows back through a hot-water supply path from a simultaneous passage, and detours around a heat exchanger.

  4th invention has a flow-path switching apparatus in the contact which connects the said simultaneous channel | path and the said hot-water supply channel | path, and when using a hot-water supply circuit and a hot-water supply circulation circuit simultaneously, it passes through a heat exchanger for latent heat recovery from a water supply channel | After being supplied to the use-side heat exchanger via the heat exchanger and the circulation pump, water is passed only to the simultaneous circuit passing through the simultaneous passage and reaching the hot water outlet. As a result, hot water can surely flow through the use side heat exchanger regardless of the water flow resistance of each of the circulation circuit and the hot water supply circuit, and depending on the flow rate of hot water and the required load of the use side heat exchanger, the circulation pump Can be stopped.

  According to a fifth aspect of the present invention, a flow path shut-off device is provided on the circulation circuit and upstream from the branch point of the simultaneous passage, and when using the hot water supply circuit, the heat for hot water supply passes through the latent heat recovery heat exchanger from the water supply path. Water is passed only through the hot water supply circuit that passes through the exchanger and reaches the hot water outlet. Thereby, unnecessary heat radiation in the use side heat exchanger can be suppressed by passing water only through the hot water supply circuit.

  According to a sixth aspect of the present invention, a flow path shut-off device is provided on the hot water outlet and upstream of the contact point with the simultaneous passage, and when using the circulation circuit, the use side heat exchanger is branched from the hot water outlet via a circulation pump. And then return to the latent heat recovery heat exchanger, and pass water only to the hot water circulation circuit from the latent heat recovery heat exchanger through the hot water supply heat exchanger to the use side heat exchanger via the circulation pump. It is what I did. Thereby, it can suppress that the circulating water by a circulation pump flows back through a hot-water supply path from a simultaneous passage, and detours around a heat exchanger.

  According to a seventh aspect of the present invention, there is provided a flow path shut-off device on the hot water outlet and upstream of the contact point with the simultaneous passage, and when the hot water supply circuit and the hot water supply circulation circuit are used simultaneously, the heat exchanger for recovering latent heat from the water supply path After passing through the hot water supply heat exchanger and the circulation side pump, the water is supplied only to the simultaneous circuit passing through the simultaneous passage to the hot water supply passage. As a result, hot water can surely flow through the use side heat exchanger regardless of the water flow resistance of each of the circulation circuit and the hot water supply circuit, and depending on the flow rate of hot water and the required load of the use side heat exchanger, the circulation pump Can be stopped.

An eighth invention has a flow path switching device at a portion where the hot water supply circuit and the hot water supply circulation circuit branch, and when using the hot water supply circuit, the heat exchanger for hot water supply passes through the latent heat recovery heat exchanger from the water supply path. The water is passed through only the hot water supply circuit that reaches the hot water supply path via the. Thus, unnecessary heat radiation in the use side heat exchanger can be suppressed by passing water only through the hot water supply circuit.

A ninth aspect of the invention has a flow path switching device at a portion where the hot water supply circuit and the hot water supply circulation circuit branch. When the circulation circuit is used, the hot water supply circuit supplies the use side heat exchanger via a circulation pump. After that, it is returned to the latent heat recovery heat exchanger, and water is passed only to the 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 through the circulation pump. It is a thing. Thereby, it can suppress that the circulating water by a circulation pump flows back in a hot-water supply path from a simultaneous channel | path, and circulates around a heat exchanger.

In a tenth aspect of the invention, a flow path switching device is provided at a portion where the hot water supply circuit and the hot water supply circulation circuit branch, and when the hot water supply circuit and the hot water supply circulation circuit are used simultaneously, a heat exchanger for recovering latent heat from the water supply path is provided. After being supplied to the use-side heat exchanger via the passage hot water supply heat exchanger and the circulation pump, water is passed only to the simultaneous circuit that passes through the simultaneous passage and reaches the outlet hot water passage. As a result, hot water can surely flow through the use side heat exchanger regardless of the water flow resistance of each of the circulation circuit and the hot water supply circuit, and depending on the flow rate of hot water and the required load of the use side heat exchanger, the circulation pump Can be stopped.

  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 is a structural diagram showing 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 that recovers the latent heat of the combustion exhaust gas, the overall thermal efficiency is improved and energy saving is achieved.

  Next, the hot water branched from the hot water supply passage 3 and 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 via the circulation pump 17. Is then returned to the upstream water supply channel 1 of the latent heat recovery heat exchanger 16, passed from the latent heat recovery heat exchanger 16 through the hot water supply heat exchanger 15, and via the circulation pump 17, the heating heat exchanger 18. The hot water supply circulation circuit 19 leading to is constructed. Since this hot water supply circulation circuit 19 is branched from the hot water supply passage 3 near the outlet of the hot water supply heat exchanger 15, the hot water supplied by the burner 2 is used to supply heat to the use side load. Therefore, it is most suitable when used for a heating circuit described later.

  Further, the simultaneous passage 27 branched from the hot water supply circulation circuit 19 is connected to the hot water discharge passage 3 via the flow passage switching means 28 as shown in the figure.

  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.

  From the standpoint of hot water supply when the equipment is on standby, the flow path switching means 28 waits so as to block the simultaneous passage side and allow only the hot water passage to pass through as shown in the figure, and opens the hot water tap 6 during hot water supply operation. The water supply flow rate sensor 23 disposed in the water supply path 1 detects water flow, the combustion fan 11 is operated by this water flow signal, and the gas source solenoid valve 7 and the gas proportional valve 8 are opened at the same time. Combustion air is supplied and combustion starts 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.

  As described above, in the present embodiment, in the single operation of hot water supply, the flow path switching means 28 is always controlled so as to block the simultaneous passage side and become the passage of only the hot water supply path, and pass water only to the hot water supply circuit. Thus, unnecessary heat dissipation in the use side heat exchanger can be suppressed.

(Embodiment 2)
FIG. 2 is a structural diagram showing a hot water supply apparatus according to the second embodiment of the present invention. In addition, the thing of the same code | symbol as 1st Embodiment has the same structure, and abbreviate | omits description.

  During the 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 hot water circulation is linked to the operation command. The circulation pump 17 for circulating hot water in the 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 is supplied to the heating heat exchanger 18 by the circulation pump 17, and heat is exchanged by the water-water heat exchange configuration and is 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, 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. At this time, the flow path switching means 28 can be prepared for the simultaneous operation described later by setting the flow path 28 to the position where the simultaneous passage and the hot water supply passage pass as shown in the figure.

  During the simultaneous operation, hot water heated by the hot water supply heat exchanger 15 is supplied to the heating heat exchanger 18 by the circulation pump 17, and heat is exchanged by the water-water heat exchange configuration and is 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. The high-temperature water heat-exchanged by the heating heat exchanger 18 passes through the illustrated flow path by the flow path switching means 28 so as to bypass the hot water supply heat exchanger 15 and the latent heat recovery heat exchanger 16. The water is mixed with the water on the incoming side by a bypass control valve 5 provided in a bypass passage 4 provided in communication with the water supply passage 1 and the hot water supply passage 3. 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. .

  As described above, during the heating independent operation, the hot water supplied to the heating heat exchanger 18 can be branched from the hot water supply path 3 constituting the hot water supply circuit, and the hot water supply circulation circuit 19 can be formed. At this time, by setting the flow path switching means to the position where the simultaneous passage and the hot water passage pass, the high temperature water required for the heating operation is ensured from the high temperature water to the low temperature water for the hot water supply circuit even during the simultaneous operation. Hot water supply priority operation capable of adjusting and supplying hot water in a wide range can be ensured.

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

  In this embodiment, as an alternative to the flow path switching means in the first embodiment described above, a circulation shutoff valve 29 provided on the hot water supply circulation circuit as shown in the figure, and a hot water supply shutoff valve provided on the hot water supply passage 30 is provided.

  From the standpoint of hot water supply when the equipment is on standby, the hot water shutoff valve 30 is on standby and the circulation shutoff valve 29 is on standby. During hot water operation, the hot water tap 6 is opened to open the hot water supply line 1 as described above. The flow sensor 23 detects water flow, the combustion fan 11 is operated by this flow signal, and the gas source solenoid valve 7 and the gas proportional valve 8 are opened at the same time, and fuel and combustion air are supplied to the burner 2 for ignition operation. The combustion starts. 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. .

  As described above, in the present embodiment, in the single operation of hot water supply, the hot water supply shut-off valve 30 is always open and the circulation shut-off valve 29 is closed, thereby shutting off the simultaneous passage side and providing only a hot water supply passage. By controlling so that water is passed only through the hot water supply circuit, unnecessary heat dissipation in the use side heat exchanger can be suppressed.

  During the 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 the hot water supply is cut off in conjunction with the operation command. The valve 30 is closed, the circulation shut-off valve 29 is opened, the circulation pump 17 that circulates 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 is supplied to the heating heat exchanger 18 by the circulation pump 17, and heat is exchanged by the water-water heat exchange configuration and is 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, 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.

  During the simultaneous operation, the hot water heated by the hot water supply heat exchanger 15 is supplied to the heating heat exchanger 18 by the circulation pump 17, heat is exchanged by the water-water heat exchange configuration, and is 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. The high-temperature water exchanged by the heating heat exchanger 18 bypasses the hot water supply heat exchanger 15 and the latent heat recovery heat exchanger 16 via the simultaneous passage 27 so as to bypass the hot water supply path 1 and the hot water supply path 3. Is mixed with water on the inflow side by a bypass control valve 5 disposed in a bypass passage 4 provided in communication with the water. 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. .

  As described above, during the heating independent operation, the hot water supplied to the heating heat exchanger 18 can be branched from the hot water supply path 3 constituting the hot water supply circuit, and the hot water supply circulation circuit 19 can be formed. At this time, since the hot water supply shut-off valve is closed, the flow of the circulating water by the circulation pump 17 flows back through a part of the hot water outlet passage 3 through the simultaneous passage 27 and the hot water supply heat exchanger 15 and the latent heat recovery heat exchanger. There is no detour of 16. Further, during the simultaneous operation as in the second embodiment, hot water in a wide range from high temperature water to low temperature water can be adjusted and supplied to the hot water supply circuit while securing high temperature water necessary for heating operation. Hot water supply priority operation can be secured.

(Embodiment 4)
FIG. 4 is a structural diagram showing a hot water supply apparatus according to the fourth embodiment of the present invention.

In the present embodiment, as an alternative to the flow path switching means in the first embodiment described above, a flow path switching device 31 is provided at a portion where the hot water supply circuit and the hot water supply circulation circuit branch as shown in the figure. is there.

From the viewpoint of hot water supply priority when the equipment is on standby, the flow path switching device 31 waits so as to block the hot water supply circulation circuit side and allow only the hot water supply passage to pass as shown in the figure. When the plug 6 is opened, the water supply side flow rate sensor 23 disposed in the water supply channel 1 detects water flow, the combustion fan 11 is operated by this water flow signal, and simultaneously the gas source solenoid valve 7 and the gas proportional valve 8 are 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. .

As described above, in the present embodiment, in the hot water supply independent operation, the hot water circulation circuit side is cut off and controlled to be a passage only for the hot water supply path, and water is passed only through the hot water supply circuit, so that use side heat exchange is performed. Unnecessary heat dissipation in the instrument can be suppressed.

During the 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 always flows in conjunction with this operation command. The path switching means 31 controls the hot water supply path so as to block only the hot water supply circuit, and the circulation pump 17 for circulating the hot water in the hot water supply circuit 19 is driven. 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 is supplied to the heating heat exchanger 18 by the circulation pump 17, and heat is exchanged by the water-water heat exchange configuration and is 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, 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.

  During the simultaneous operation, the hot water heated by the hot water supply heat exchanger 15 is supplied to the heating heat exchanger 18 by the circulation pump 17, heat is exchanged by the water-water heat exchange configuration, and is 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. The high-temperature water exchanged by the heating heat exchanger 18 bypasses the hot water supply heat exchanger 15 and the latent heat recovery heat exchanger 16 via the simultaneous passage 27 so as to bypass the hot water supply path 1 and the hot water supply path 3. Is mixed with water on the inflow side by a bypass control valve 5 disposed in a bypass passage 4 provided in communication with the water. 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. .

  As described above, the hot water supply apparatus according to the present invention has a hot water supply and heating system, a hot water supply and a bath, or a hot water supply and a heating and a bath as a single heat source. Since it is possible to reduce the weight, the installation space is secured, the workability is improved, and the latent heat recovery heat exchanger is provided, so it is possible to achieve high efficiency and save energy by reducing running costs. It can also be applied to uses such as petroleum hot water bath equipment and hot water heaters.

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 Structure diagram of hot water supply apparatus in Embodiment 4 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)
DESCRIPTION OF SYMBOLS 19 Hot water supply circulation circuit 27 Simultaneous passage 28 Flow path switching means 29 Circulation shut-off valve 30 Hot water shut-off valve 31 Flow path switching means

Claims (10)

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 and vessel, the latent heat recovery heat exchanger and the hot water supply heat exchanger connected in series, leading to the tapping line via the street the hot water supply heat exchanger the latent heat recovery heat exchanger from the water supply passage and hot water supply circuit, after supplying to the usage-side heat exchanger via a branch circulating pump from the tapping line, back to the latent heat recovery heat exchanger, the heat exchanger for the hot water supply from the latent heat recovery heat exchanger a hot water supply circulation circuit leading to the utilization side heat exchanger via the through the circulation pump, the simultaneous passage branched from the hot water supply circulation circuit connecting said tapping channel,
A channel switching device or a channel blocking device having a function similar to that of the channel switching device is divided into a portion where the hot water supply circuit and the hot water supply circulation circuit branch, or a portion where the simultaneous passage is connected to the hot water supply channel, respectively. provided, switch them the flow channel switching device or the flow path block unit water flow paths by operating a single use of the hot water supply circuit by its alone use of the hot water supply circulation circuit, or with the hot water supply circuit and the A hot water supply device that can select either simultaneous use of the hot water circulation circuit. It has a flow path switching device that connects the simultaneous passage and the hot water supply passage. When using the hot water supply circuit, it passes only through the hot water supply circuit from the water supply passage through the latent heat recovery heat exchanger to the hot water supply passage through the hot water supply heat exchanger. The hot water supply apparatus according to claim 1, wherein water is supplied. The heat exchanger for latent heat recovery is provided with a flow path switching device that connects the simultaneous passage and the hot water passage, and when the circulation circuit is used, after being branched from the hot water passage and supplied to the use side heat exchanger via the circulation pump The hot water supply apparatus according to claim 1, wherein water is passed only through the hot water supply circulation circuit from the latent heat recovery heat exchanger through the hot water supply heat exchanger to the utilization side heat exchanger through the circulation pump. It has a flow path switching device that connects the simultaneous passage and the hot water supply passage, and when using the hot water supply circuit and the hot water supply circulation circuit simultaneously, it passes through the heat exchanger for latent heat recovery from the water supply passage through the hot water supply heat exchanger and the circulation pump. The hot water supply apparatus according to claim 1, wherein water is supplied only to a simultaneous circuit that passes through the simultaneous passage and reaches a hot water outlet after being supplied to the use side heat exchanger. A flow path shut-off device is provided on the circulation circuit and upstream from the branch point of the simultaneous passage. When using the hot water supply circuit, the hot water supply path passes through the latent heat recovery heat exchanger and the hot water supply heat exchanger. The hot water supply apparatus according to claim 1, wherein water is passed only through the hot water supply circuit leading to. A flow path shut-off device is provided on the hot water path and upstream of the contact point with the simultaneous path, and when using the circulation circuit, after branching from the hot water path and supplying the utilization side heat exchanger via the circulation pump, 2. Returning to the latent heat recovery heat exchanger, water is passed only through the hot water circulation circuit from the latent heat recovery heat exchanger through the hot water supply heat exchanger to the use side heat exchanger through the circulation pump. The hot water supply device described. A flow path shut-off device is provided on the hot water outlet and upstream of the contact point with the simultaneous passage. When using the hot water supply circuit and the hot water supply circulation circuit at the same time, the heat exchange for hot water supply passes through the latent heat recovery heat exchanger from the water supply path. The hot water supply apparatus according to claim 1, wherein water is supplied only to a simultaneous circuit that passes through the simultaneous passage and reaches a hot water supply passage after being supplied to the use-side heat exchanger via a heater and a circulation pump. A flow path switching device is provided at a portion where the hot water supply circuit and the hot water supply circulation circuit branch, and when using the hot water supply circuit, it passes through the heat exchanger for latent heat recovery from the water supply path to the hot water supply path through the heat exchanger for hot water supply. The hot water supply apparatus according to claim 1, wherein water is supplied only to the hot water supply circuit. A flow path switching device is provided at a portion where the hot water supply circuit and the hot water supply circulation circuit branch, and when the circulation circuit is used, the latent heat recovery is performed after the hot water supply circuit is supplied to the use side heat exchanger via the circulation pump. The water flow is returned only to the hot water supply circulation circuit from the latent heat recovery heat exchanger through the hot water supply heat exchanger to the user side heat exchanger through the circulation pump. Hot water supply device. The hot water supply circuit and the hot water supply circulation circuit have a flow path switching device at a branch portion, and when the hot water supply circuit and the hot water supply circulation circuit are used at the same time, the heat exchanger for hot water supply passes through the latent heat recovery heat exchanger from the water supply path. The hot water supply apparatus according to claim 1, wherein water is supplied only to a simultaneous circuit that passes through the simultaneous passage and reaches a hot water supply passage after being supplied to the use side heat exchanger via a circulation pump.

Images