JP4715438B2 - 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 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 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 configuring a hot water supply circulation circuit that supplies heat to the circuit, it is possible to configure a use side heat exchanger that is not related to the hot water heat exchanger or latent heat recovery heat exchanger, and a main body configuration including a pipe configuration. By simplifying the size and weight of the equipment, the heating path is mainly a hot water supply circuit, and a hot water circulation circuit that circulates hot water in the use side heat exchanger is provided with a check valve so that the hot water supply alone Provided is an easy-to-use hot water supply device that prioritizes hot water supply performance by improving hot water temperature characteristics during use. 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. Provided is a hot water supply device that facilitates, reduces the running cost with high efficiency.

  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 water heater, passes through the heat exchanger for hot water supply, and reaches the hot water supply passage, and is branched from the hot water supply passage and connected to the water supply passage through the use side heat exchanger to heat the hot water to recover the latent heat. Before connecting the hot water supply circulation circuit for supplying the hot water supply circuit to the use side heat exchanger from the exchanger, the circulation pump for supplying hot water to the hot water supply circulation circuit, and the water supply path of the hot water supply circulation circuit Check valve that prevents hot water from flowing back into the hot water circulation circuit It has, whether to use the hot water supply circuit, or whether to use the hot water circulation circuit, or whether to use the hot water supply circuit and the hot water supply circulation circuit while at the same time that you to select a.

  Thus, a hot water supply circulation circuit that forms one heating path with the hot water supply heat exchanger and the latent heat recovery heat exchanger and supplies heat to the heating circuit and the bath reheating circuit using the circulating water of the heating path is provided. By configuring, it is possible to configure the use side heat exchanger that is not related to the hot water supply heat exchanger or the latent heat recovery heat exchanger, and the simplification of the main body configuration including the piping configuration reduces the size and weight of the appliance. In addition to the above, the heating path is the main part of the hot water supply circuit, and a hot water circulation circuit for circulating hot water in the use side heat exchanger is provided with a check valve so that the circulation pump of the hot water supply circulation circuit is not operated alone. During use, due to pressure balance, water from the water supply side flows back through the hot water supply circulation circuit and flows into the hot water supply path, and the hot water temperature fluctuates. To prevent complications Therefore, it is possible to provide an easy-to-use hot water supply device that prioritizes hot water supply performance, and by making one heating path configuration mainly composed of a hot water supply circuit, residual water boiling in the heat exchanger during single operation It is possible to provide a hot water supply apparatus that solves the problem, facilitates the configuration for improving the corrosion resistance of the latent heat recovery heat exchanger, and achieves high efficiency and reduced running cost.

  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 configuring the hot water supply circulation circuit, it is possible to configure the use side heat exchanger not related to the hot water heat exchanger or latent heat recovery heat exchanger, and downsizing the appliance by simplifying the main body configuration including the piping configuration In addition to realizing light weight, the circulation path of the hot water supply circuit operates by making the heating path the main part of the hot water supply circuit and providing a check valve in the hot water supply circuit that circulates hot water in the use side heat exchanger. When hot water is not used alone, due to the pressure balance, water from the hot water supply circuit flows back to the hot water supply circuit and flows into the hot water supply path, and the hot water temperature fluctuates, and the combustion control takes into account the reverse water flow. Hot water temperature control becomes complicated It is possible to provide a hot water supply device convenient giving priority to the hot water supply performance by preventing.

  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. A latent heat recovery heat exchanger that connects the hot water supply heat exchanger and the latent heat recovery heat exchanger in series, passes through the latent heat recovery heat exchanger from the water supply channel, passes through the hot water supply heat exchanger, A hot water supply circuit leading to the road is formed, and it is branched from the hot water supply path and connected to the water supply path via the use side heat exchanger, and the hot water is used from the latent heat recovery heat exchanger through the hot water supply heat exchanger. A hot water supply circuit to the side heat exchanger, a circulation pump for supplying hot water to the hot water supply circuit, and a hot water flow in the hot water supply circuit before the hot water supply circuit is connected to the hot water supply circuit are prevented. Use a hot water supply circuit, or It is characterized by being able to select whether to use a hot water supply circuit or to use a hot water supply circuit and a hot water supply circuit at the same time. It is related to the heat exchanger for hot water supply and the heat exchanger for latent heat recovery by forming two heating paths and using the circulating water of the heating path to supply heat to the heating circuit and the bath reheating circuit. The use side heat exchanger can be configured, and the main body configuration including the pipe configuration is simplified to reduce the size and weight of the appliance, and the heating path is the main part of the hot water supply circuit, and the use side heat exchanger By providing a check valve in the hot water supply circulation circuit that circulates hot water in the hot water supply circuit, when the hot water supply circulation circuit is not operating, the water from the water supply side flows back through the hot water supply circuit due to the pressure balance. Flow on the road In addition, it provides a convenient hot water supply system that prioritizes hot water supply performance by preventing the temperature of the hot water from fluctuating and preventing the combustion control and hot water temperature control from becoming complicated in consideration of the water in the reverse flow. In addition, 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 the corrosion resistance of the heat exchanger for recovering latent heat can be improved. Therefore, it is possible to provide a hot water supply device that facilitates the configuration for the above-described purpose and that is highly efficient and reduces running costs.

  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, the hot water supply performance and the heating performance can be secured at the same time, and the hot water circulation circuit for circulating the hot water in the heating heat exchanger is provided with a check valve so that the circulation pump of the hot water supply circulation circuit is not operated. When using hot water alone, the water from the water supply side flows back through the hot water circulation circuit due to pressure balance and flows into the hot water supply path, and the hot water temperature fluctuates or the water of the reverse flow is considered. An easy-to-use hot water supply device that ensures hot water supply performance by preventing the control from becoming complicated can be provided.

  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. The hot water supply performance and bath reheating performance can be secured at the same time, and the hot water circulation circuit that circulates hot water in the bath heat exchanger is provided with a check valve to circulate the hot water circulation circuit. When using hot water alone when the pump is not operating, water from the water supply side flows back to the hot water circulation circuit due to pressure balance and flows into the hot water supply path, and the hot water temperature fluctuates and the water of the reverse flow is taken into account. Thus, it is possible to provide an easy-to-use hot water supply apparatus that ensures hot water supply performance by preventing the combustion control and hot water temperature control from becoming complicated.

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. The hot water supply can be secured at the same time, and a hot water circulation circuit that circulates hot water in the heating and bath heat exchangers is provided with a check valve so that the circulation pump of the hot water circulation circuit is not operating alone. During use, due to pressure balance, water from the water supply side flows back through the hot water supply circulation circuit and flows into the hot water supply path, and the hot water temperature fluctuates. It is possible to provide an easy-to-use hot water supply device that ensures hot water supply performance by preventing complication.

  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. The passage resistance can be reduced, the circulation pump can be reduced in size and weight, and the parallel circuit of the hot water circulation circuit that circulates hot water to the use side heat exchanger connected in parallel can be connected. By providing a check valve before connecting to the water supply channel, when using only hot water when the circulation pump of the hot water supply circulation circuit is not operating, the water from the water supply side flows back into the hot water supply channel due to the pressure balance. The temperature of the hot spring fluctuates Considering the flow amount of water, combustion control can be hot water temperature control to provide a user-friendly water heater that ensures the hot water supply performance by preventing the or become complicated.

  A sixth aspect of the present invention is a hot water supply heat exchanger that heats water supplied from a water supply passage by combustion of a burner and supplies hot water to a hot water supply passage, and collects the latent heat of the combustion exhaust gas disposed in the combustion exhaust gas passage of the burner. The latent heat recovery heat exchanger, the hot water supply heat exchanger, and the latent heat recovery heat exchanger are connected in series, passing through the latent heat recovery heat exchanger from the water supply path to the hot water supply path through the hot water supply heat exchanger. Hot water supply circuit, and branching from the hot water supply path, connected to the water supply path via the use side heat exchanger, and passing hot water from the latent heat recovery heat exchanger to the use side heat exchanger through the hot water supply heat exchanger A hot water supply circulation circuit to be supplied; a circulation pump for supplying hot water to the hot water supply circulation circuit; and a check valve for preventing hot water from flowing back into the hot water supply circulation circuit before connection to the water supply passage of the hot water supply circulation circuit; And a simultaneous passage that branches from the hot water supply circulation circuit and connects to the hot water supply passage. , In which is characterized in that to be able to select a path passing water in each simultaneous use of a single use, single use of the hot-water circulation circuit or the hot water supply circuit and the hot water supply circulation circuit, the hot water supply circuit. 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, The heating path is the main part of the hot water supply circuit, and a check valve is provided in the hot water supply circulation circuit that circulates hot water in the use side heat exchanger. Due to the balance, water from the water supply side flows back through the hot water supply circulation circuit and flows into the hot water outlet, and the hot water temperature fluctuates, and the combustion control and hot water temperature control become complicated in consideration of the reverse water flow. Hot water supply by preventing It is possible to provide an easy-to-use hot water supply device that prioritizes performance, and to solve the problem of residual water boiling in the heat exchanger during single operation by adopting a single heating path configuration mainly composed of a hot water supply circuit. At the same time, it is possible to provide a hot water supply apparatus that facilitates the structure for improving the corrosion resistance of the heat exchanger for recovering latent heat, and that is highly efficient and reduces the running cost.

7th invention has a flow-path switching apparatus in the contact which connects the said simultaneous channel | path and the said hot-water supply channel, and when using a hot-water supply circuit and a hot-water supply circulation circuit simultaneously, it passes through the heat exchanger for latent heat recovery from a water supply channel, After passing through the heat exchanger and the use side heat exchanger, water is passed only to the simultaneous circuit that passes through the simultaneous passage and reaches the hot water outlet. As a result, it is possible to reliably flow hot water to the use-side heat exchanger regardless of the water flow resistance of the circulation circuit and the hot water supply circuit, and to reduce the influence of pressure loss of the circulation pump. Depending on the flow rate and the required load on the heat exchanger on the use side, the circulation pump can be stopped, and the hot water supply circulation circuit is connected to the water supply side from the water supply side due to the pressure balance even when the circulation pump of the hot water supply circulation circuit is not operating. The hot water supply performance is improved by preventing the water from flowing back and flowing into the hot water supply path to fluctuate the hot water temperature, and taking into account the water in the reverse flow, so that combustion control and hot water temperature control are not complicated. A hot water supply apparatus that is prioritized and easy to use can be provided.

(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 to rise to a predetermined temperature, then supplied to a hot water supply channel 3, and the water supply channel 1 and the hot water supply channel 3 are connected to each other. A part of water supplied from the water supply channel 1 from the bypass passage 4 is supplied via 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 in which a gas source solenoid valve 7, a gas proportional valve 8, and a gas switching valve 9 are disposed, and combustion air is supplied 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 from the exhaust port 14 to the outside of the appliance.

  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 the 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, after supplying the hot 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 branched from the hot water path 3 and is a use side heat exchanger, It returns to the upstream water supply channel 1 of the latent heat recovery heat exchanger 16, and constitutes a hot water supply circulation circuit 19 from the latent heat recovery heat exchanger 16 through the hot water supply heat exchanger 15 to the heating heat exchanger 18. A circulation pump 17 that circulates hot water in the hot water supply circulation circuit 19 and a check valve 27 that prevents the hot water from flowing back while connecting to the water supply path 1 after branching from the hot water supply path 3 of the hot water supply circulation circuit 19 are provided. 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 heated 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 in this 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 course of the exhaust operation of the combustion gas, the water supplied from the water supply path 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. . At this time, since there is a check valve 27 in the passage from the connection section of the hot water supply circulation circuit 19 to the hot water supply path 3 through the heat exchanger 18 for heating, water from the hot water supply path 1 goes to the hot water supply path 3 It does not flow, and does not affect the hot water temperature control in which the hot water heated by the hot water supply heat exchanger 15 is controlled to supply hot water having a set temperature by controlling the bypass control valve 5.

  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 course of the exhaust operation of the combustion gas, the water supplied from the water supply path 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 circulated through the hot water supply circulation circuit 19 by the circulation pump 17 and 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. It is. Heat of the heating circuit 20 received by the heating heat exchanger 20 is radiated as warm air by the radiator 21. Then, the hot water whose temperature has been lowered by heat exchange in the heating heat exchanger 18 flows through the hot water supply circuit 19 through the latent heat recovery heat exchanger 16 and the hot water heat exchanger 15 by the circulation pump 17 to a predetermined temperature. While being heated and supplied again to the heating heat exchanger 18 and a heating operation command from the radiator 21 is issued, the circulation is continued while maintaining a predetermined hot water temperature.

In this way, the hot water supplied to the heating heat exchanger 18 is branched from the hot water supply path 3 constituting the hot water supply circuit to form a hot water supply circulation circuit 19, thereby securing high-temperature water necessary for the heating operation, 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.
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 structure including the piping structure realizes downsizing and weight reduction of the appliance, and the heating path is used as the main body of the hot water supply circuit, and the hot water is circulated through the heating heat exchanger 18 of the use side heat exchanger. By providing the check valve 27 in the hot water supply circuit 19, the water from the water supply side flows back through the hot water supply circuit 19 due to the pressure balance when the hot water supply alone is not operated by the circulation pump 17 on the hot water supply circuit 19. Hot spring 3 An easy-to-use hot water supply system that prioritizes hot water supply performance by preventing the temperature of the hot water from fluctuating and preventing the combustion control and hot water temperature control from becoming complicated by taking into account the backflow water. In addition, by adopting a single heating path configuration mainly including a hot water supply circuit, the problem of residual water boiling in the heat exchanger during single operation can be solved, and the latent heat recovery heat exchanger 16 can be provided. It is possible to provide a hot water supply device that facilitates a structure for improving corrosion resistance, and that is highly efficient and reduces running costs.

(Embodiment 2)
FIG. 2 is a structural diagram of a hot water supply apparatus according to the second embodiment of the present invention.
In this embodiment, components having the same reference numerals as those in the first embodiment have the same structure, and description thereof is omitted. A difference from the first embodiment is that a branch of the hot water supply circulation circuit 19 is provided from the hot water supply path 3 after passing through the use side heat exchanger, and the circulation is made between the branch from the hot water supply path 3 and the connection to the water supply path 1. The pump 17 and the check valve 27 are provided.

  About operation | movement and an effect | action, it is the same as 1st Embodiment, Such a form is also possible by an instrument structure.

(Embodiment 3)
FIG. 3 shows 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.

  Heating heat exchanger 18 and bath heat exchanger 28 are connected in parallel to hot water supply circulation circuit 19, and high-temperature water heated by latent heat recovery heat exchanger 16 and hot water supply heat exchanger 15 is circulated by circulation pump 17. Then, heat is exchanged to supply heat to the heating circuit 20 or the bath reheating circuit 29. The hot water whose temperature has decreased due to heat exchange is pulled by a circulation pump 17 provided downstream of the heating heat exchanger 18 and the bath heat exchanger 28, and the latent heat recovery heat exchanger 16 passes through the hot water supply circuit 19. And flows to the hot water supply heat exchanger 15 where it is heated and supplied again. In addition, a check valve 27 is provided before connecting the heat exchanger 20 for heating and the heat exchanger 28 for bath connected in parallel and connecting to the water supply channel 1 to exchange heat for heating of the use side heat exchanger. The hot water flow to the vessel 20 and the bath heat exchanger 28 is limited to one direction.

  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 hot 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 pump 30 provided in the bath circuit 29 is driven by the operation command of the remote control remote controller 24 and circulation is detected by the water flow detector 31, the hot water in the hot water supply circuit 19 is interlocked. The hot water heated by the hot water supply heat exchanger 15 that ignites the burner 2 by driving the pump 17 that circulates and recovers the burned heat is heat-exchanged by the bath heat exchanger 28 and transferred to the bath circuit 29. Be heated. The heat of the bath circuit 29 received by the bath heat exchanger 28 is circulated to the bathtub 32 and reheated.

During simultaneous heating and bath operation, the heating circuits 20 and the pumps 22 and 30 of the bath circuit 29 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 28 at substantially the same temperature, and is transferred to the heating circuit 20 and the bath circuit 29.

  Moreover, simultaneous operation by combinations other than the above is possible, and the heat exchanger 20 for heating and the heat exchanger 28 for bath 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 addition, since a check valve 27 is provided before the heating heat exchanger 20 and the bath heat exchanger 28 connected in parallel are connected to the water supply channel 1, Even through the circuit, the water from the water supply channel 1 does not flow back and flows into the hot water supply channel 3, and does not affect the hot water temperature control. Even when hot water supply and each use side heat exchanger are used at the same time, the water from the water supply channel 1 flows backward and flows into the hot water supply channel 3 without affecting the hot water supply temperature control. By preventing the control from becoming complicated, it is possible to provide an easy-to-use hot water supply device that prioritizes hot water supply performance.

  In this way, hot water supplied to the use side heat exchanger is branched from the hot water supply path 3 constituting the hot water supply circuit to form a hot water supply circulation circuit 19 to secure high temperature water necessary for operation of the use side load. However, it is possible to ensure hot water supply priority operation capable of adjusting and supplying a wide range of hot water from high temperature water to low temperature water to the hot water supply circuit.

(Embodiment 4)
FIG. 4 shows a structural diagram of a hot water supply apparatus according to the fourth 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. The difference from the first embodiment is that a simultaneous passage 33 that branches from the hot water supply circulation circuit 19 and connects to the hot water discharge passage 3 and a flow passage switching means 34 are provided at the contact point connecting the simultaneous passage 33 and the hot water discharge passage 3 in the previous period. The circulation pump 17 is arranged downstream from the branch with the simultaneous passage 33 of the hot water supply circulation circuit 19.
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 unit 34 waits so as to block the simultaneous passage side and allow only the hot water outlet to pass through. When the hot water supply operation is performed, the water supply path 1 is opened. The water supply side flow rate sensor 23 arranged in the flow sensor detects water flow, the combustion fan 11 is operated by this water flow signal, 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. Is supplied and combustion starts by the ignition operation. At this time, since there is a check valve 27 in the passage from the connection section of the hot water supply circulation circuit 19 to the hot water supply path 3 through the heat exchanger 18 for heating, water from the hot water supply path 1 goes to the hot water supply path 3 It does not flow, and does not affect the hot water temperature control in which the hot water heated by the hot water supply heat exchanger 15 is controlled to supply hot water having a set temperature by controlling the bypass control valve 5.

At the time of simultaneous operation, the flow path switching means 34 is controlled so that the simultaneous path side is opened as shown in the figure, and the high-temperature water heat-exchanged by the heating heat exchanger 18 passes through the simultaneous path 33 and the flow path switching means 34. Bypass control that is led to the hot water supply passage 3 and disposed in a bypass passage 4 that is provided in communication with the hot 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 water is mixed with the water on the incoming side by the valve 5. 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. . Even in this case, since there is a check valve 27 between the connection portion 33 of the hot water supply circulation circuit 19 and the connection portion of the water supply passage 1, water from the water supply passage 1 does not flow to the hot water supply passage 3, The hot water heated by the heat exchanger 15 does not affect the hot water temperature control for controlling the bypass control valve 5 to supply hot water at the set temperature, and the combustion control and the hot water temperature control are complicated. Therefore, it is possible to provide an easy-to-use hot water supply apparatus that prioritizes hot water supply performance.

  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)
19 Hot-water supply circulation circuit 27 Check valve 28 Heat exchanger for bath (use side heat exchanger)

Claims (7)

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 circuit that connects the heat exchanger for hot water supply and the heat exchanger for latent heat recovery in series, passes from the water supply passage through the heat exchanger for latent heat recovery, passes through the heat exchanger for hot water supply, and reaches the hot water supply passage. The hot water is supplied from the latent heat recovery heat exchanger through the hot water supply heat exchanger to the use side heat exchanger. A hot water supply circulation circuit, a circulation pump for supplying hot water to the hot water supply circulation circuit, and a check valve for preventing hot water from flowing back into the hot water supply circulation circuit before connection to the water supply passage of the hot water supply circulation circuit. Use the hot water supply circuit or hot water circulation cycle Or use of, or the hot water supply apparatus that whether to use the hot water supply circuit and the hot water supply circulation circuit simultaneously, 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. 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 circuit that connects the heat exchanger for hot water supply and the heat exchanger for latent heat recovery in series, 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, and A hot water supply circulation circuit that branches from the hot water supply path and connects to the water supply path via the use side heat exchanger, and supplies hot water from the latent heat recovery heat exchanger to the use side heat exchanger through the hot water supply heat exchanger; A circulating pump for supplying hot water to the hot water circulation circuit, a check valve for preventing hot water from flowing back into the hot water circulation circuit before connection to the water supply path of the hot water circulation circuit, and the hot water circulation circuit It has a simultaneous passage that branches and connects the hot water supply path, Single use, hot water supply apparatus which can select through water route for each simultaneous use alone use or hot water supply circuit and the hot water supply circulation circuit, the hot water supply circulation circuit. At the time of simultaneous use of the hot water supply circuit and the hot water supply circulation circuit, the hot water supply heat exchanger passes through the latent heat recovery heat exchanger from the water supply path when using the hot water supply circuit and the hot water supply circulation circuit. The hot water supply apparatus according to claim 6, wherein after passing through a heat exchanger, water is supplied only to a simultaneous circuit that passes through the simultaneous passage and reaches a hot water outlet.