JP4779571B2 - 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 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 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 that is disposed in the path to recover the latent heat of the combustion exhaust gas, and the hot water supply heat exchanger and the latent heat recovery heat exchanger are connected in series, and a latent heat recovery heat exchanger is connected from the water supply channel. A hot water supply circuit that passes through a hot water supply heat exchanger to a hot water supply path, and is branched from the hot water supply path and supplied to the use side heat exchanger via a circulation pump, and then returned to the latent heat recovery heat exchanger, for latent heat recovery. A hot water supply circulation circuit from a heat exchanger through a hot water supply heat exchanger to a use side heat exchanger via a circulation pump, and a portion where the hot water supply circulation circuit and the hot water outlet branch from the hot water supply heat exchanger. A flow path switching device;
A flow path shut-off device provided downstream from the intersection with the hot water supply circuit on the hot water supply circuit, and when the hot water supply circuit and the hot water supply circuit are used simultaneously, the latent heat recovery heat exchange from the water supply circuit The hot water supply heat exchanger and the circulation pump are supplied to the user side heat exchanger through a water heater, and then water is passed through the hot water outlet .

  As a result, one heating path is formed by the hot water supply heat exchanger and the latent heat recovery heat exchanger, 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 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. 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. A hot water supply circuit, a branch from the hot water supply path, and supplied to the use side heat exchanger via a circulation pump, and then returned to the latent heat recovery heat exchanger, from the latent heat recovery heat exchanger through the hot water supply heat exchanger. A hot water supply circulation circuit that reaches a user-side heat exchanger via a circulation pump, a flow path switching device provided at a portion that branches the hot water supply circulation circuit and the hot water supply path from the hot water supply heat exchanger, and the hot water supply circulation circuit conduit shutting provided downstream of the intersection between the tapping passage And a location, time of simultaneous use of the hot water supply circuit and the hot water supply circulation circuit, the water supply passage said latent heat recovery heat exchanger through the hot water supply heat exchanger from the utilization side heat exchanger through the circulating pump In this case, water is passed through the hot water outlet after being supplied to the vessel . 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. . In particular, a wide range of hot and cold water from hot water to low temperature water is supplied to the hot water supply circuit while securing high temperature water necessary for heating operation even during simultaneous operation.
Hot water supply priority operation that can be adjusted and supplied can be ensured.

  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)
1 and 3 are structural views showing a hot water supply apparatus according to the first embodiment of the present invention.

  In the figure, first, the water supplied from the water supply path 1 is heated by combustion of the burner 2 to rise to a predetermined temperature, and then supplied to the hot water supply path 3, and the bypass formed by communicating the water supply path 1 and the hot water supply path 3. A part of the water supplied from the water supply path 1 from the 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 provided with a gas source solenoid valve 7, a gas proportional valve 8, and a gas switching valve 9, and supplied with combustion air from a combustion fan 11, in advance. A combustion operation is performed according to a predetermined sequence. Then, the combustion gas generated by the combustion of the burner 2 passes through the combustion chamber 12, passes through the exhaust passage 13, and is discharged out of the instrument from the exhaust port 14.

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

  Next, the hot water 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. A circulation cutoff valve 28 provided on the hot water supply circulation circuit 19 on the upstream side of the circulation pump 17 is configured. 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 hot water supply circulation circuit 19 is connected to the hot water supply passage 3 through the flow passage switching means 27 as shown in the figure.

  Here, as an arrangement configuration of the flow path switching means 27 and the circulation shut-off valve 28, the outlet hot water passage 3 and the hot water supply circulation circuit 19 are branched at the outlet of the hot water supply heat exchanger 12 in FIG. A circulation shutoff valve 28 is provided in the hot water supply circulation circuit 19, and further, a flow path switching means 27 for switching the hot water supply path 3 and the flow path is provided in the hot water supply circulation circuit 19 via the heat exchanger 18 for heating provided downstream thereof. It is set as the structure provided, and it is trying to reduce the heat dissipation loss in the heat exchanger 18 side for heating at the time of hot water supply independent operation.

In FIG. 3, the outlet hot water passage 3 and the hot water supply circulation circuit 19 are branched at the outlet of the hot water supply heat exchanger 12, and the flow path switching means 27 is provided at the branch, and the downstream heat exchanger for heating is provided. A circulation shutoff valve 28 is provided in the hot water supply circulation circuit 19 via 18 so as to reduce a heat radiation loss on the heating heat exchanger 18 side during hot water supply single operation.

  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 viewpoint of hot water supply priority when the equipment is on standby, the circulation shut-off valve 28 is on standby, the flow path switching means 27 is on standby to shut off the hot water supply circulation circuit side as shown in the figure and allow only the hot water supply path to pass through, During the 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 and the gas proportional. The valve 8 is opened, fuel and combustion air are supplied to the burner 2, and combustion is started by an ignition operation. Combustion gas generated by the start of combustion of the burner 2 is discharged from the exhaust port 14 via the exhaust passage 13 from the combustion chamber 12. In the process of exhausting the combustion gas, the water supplied from the water supply passage 1 is heated by the hot water supply heat exchanger 15 disposed in the combustion chamber 12 and the latent heat recovery heat exchanger 16 disposed in the exhaust passage 13. .

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

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

  As described above, in the present embodiment, in the single operation of hot water supply, the flow path switching means 27 always controls the hot water supply circulation circuit side so as to be a passage only for the hot water supply path, and passes water only to the hot water supply circuit. By this, 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 circulation shut-off valve 28 is set in a standby state, and the flow path switching means 27 is set at a position where water flows through the hot water supply circulation circuit and the hot water supply passage as shown in the drawing, so that it is possible to prepare for the simultaneous operation described later.

  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. Then, the high-temperature water heat-exchanged by the heating heat exchanger 18 passes through the illustrated flow path by the flow path switching means 27 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, the flow path switching means is located at a position where the hot water supply circulation circuit and the hot water supply passage pass, so that high temperature water required for heating operation can be secured from the high temperature water to low temperature water for the hot water supply circuit even during simultaneous operation. It is possible to ensure hot water supply priority operation capable of adjusting and supplying hot water in a wide range.

(Embodiment 3)
FIG. 4 is a structural diagram showing a hot water supply apparatus according to the third 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 circulation shut-off valve 28 is set in a standby state, and the flow path switching means 27 is set at a position where water is passed through the hot water supply circulation circuit as shown in the figure, so that it is possible to prepare for the simultaneous operation described later.

  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. Then, the high-temperature water heat-exchanged by the heating heat exchanger 18 passes through the illustrated flow path by the flow path switching means 27 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, the circulation shut-off valve 28 is set in a standby state, and the flow path switching means 27 is set at a position where water is supplied to the hot water supply circulation circuit, so that high temperature water necessary for heating operation can be secured even during simultaneous operation. Therefore, it is possible to secure hot water supply priority operation capable of adjusting and supplying a wide range of hot water from high temperature water to low temperature water.

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

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 Flow path switching means 28 Circulation shut-off valve

Claims (1)

A hot water supply heat exchanger that heats the water supplied from the water supply channel by combustion of the burner and supplies hot water to the hot water supply channel;
A latent heat recovery heat exchanger that is disposed in the combustion exhaust gas path of the burner and recovers the latent heat of the combustion exhaust gas;
The heat exchanger for hot water supply and the heat exchanger for latent heat recovery are connected in series,
A 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,
After branching from the hot water supply path and supplying it to the use side heat exchanger via a circulation pump, it is returned to the latent heat recovery heat exchanger and passed from the latent heat recovery heat exchanger through the hot water supply heat exchanger via the circulation pump. A hot water supply circulation circuit leading to the use side heat exchanger,
A flow path switching device provided at a portion that branches the hot water supply circulation circuit and the hot water supply path from the hot water supply heat exchanger ;
A flow path shut-off device provided downstream from the intersection with the hot water supply circuit on the hot water supply circuit, and when the hot water supply circuit and the hot water supply circuit are used simultaneously, the latent heat recovery heat exchange from the water supply circuit A hot water supply apparatus which supplies water to the use side heat exchanger through the hot water supply heat exchanger and the circulation pump, and then allows water to flow into the hot water outlet .