JP2007107743A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain reduction in size/reduction in weight/increase in efficiency of an apparatus, by using a single heat source for hot water supply, heating and bath, with a combination of a hot water supply heat exchanger and a latent heat recovery heat exchanger. <P>SOLUTION: The water heater comprises the hot water supply heat exchanger 15, the latent heat recovery heat exchanger 16, the heat exchanger 15 and the heat exchanger 16 being connected in series, a hot water supply circuit extending from a water supply passage 1 to a hot water supply passage 3 through the heat exchanger 16 and then through the heat exchanger 15, and a hot water circulation circuit 19 branched from the hot water supply passage 3 to supply hot water to a using-side heat exchanger 18 through a circulation pump 17, then return it to the heat exchanger 16, and carry it from the heat exchanger 16 to the using-side heat exchanger 18 through the heat exchanger 16 and then through the circulation pump 17. The circulation pump 17 is operated when a water supply thermistor has a fixed temperature or lower. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hot water supply heat exchanger that is heated by combustion heat of a burner, and a hot water supply device that includes a latent heat recovery heat exchanger that recovers latent heat of combustion exhaust gas, and in particular, the hot water supply heat exchanger and latent heat recovery heat exchange. The present invention relates to a hot water supply apparatus 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 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. Simplification reduces the size and weight of the equipment, and protects the equipment from damage due to freezing in winter by operating the hot water circulation pump when the feed water thermistor that detects the feed water temperature falls below a certain temperature, preventing freezing A hot water supply apparatus that eliminates the heater and simplifies the configuration of the main body is provided. 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 the heat exchanger through the hot water supply heat exchanger to the use side heat exchanger via the circulation pump, and the circulation pump is operated when the feed water thermistor for detecting the feed water temperature falls below a certain temperature. It is what I did.

  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, Even when the hot water circulation circuit is not used for a long time, it is possible to prevent copper ions from depositing in the stagnant water and prevent germs from growing, providing a hygienic and easy-to-use hot water supply device, 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 configuration for improving the corrosion resistance of the latent heat recovery heat exchanger can be facilitated. With high efficiency It is possible to provide a water heater which thereby reducing the running costs.

  In addition, by operating the hot water supply circulation pump when the feed water thermistor that detects the feed water temperature falls below a certain temperature, the hot water supply device that protects the device from damage due to freezing in winter and eliminates the freeze prevention heater and simplifies the main body configuration. I will provide a.

  The hot water supply apparatus of the present invention forms one heating path with a hot water supply heat exchanger and a latent heat recovery heat exchanger, and supplies heat to a heating circuit or a bath reheating circuit using the circulating water of the heating path. By adopting a configuration, it is possible to configure a heat exchanger on the use side that is not related to the heat exchanger for hot water supply or the heat exchanger for recovering latent heat. In addition, the hot water supply circulation pump is operated when the feed water thermistor that detects the feed water temperature falls below a certain temperature, thereby protecting the device from damage due to freezing in the winter and eliminating the freeze prevention heater and simplifying the main body configuration. A hot water supply apparatus can be provided.

  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,
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 a use-side heat exchanger, and a single use of the hot water supply circuit, a single use of the hot water supply circulation circuit, or a simultaneous use of the hot water supply circuit and the hot water supply circulation circuit can be selected, The circulating pump is operated when the feed water thermistor for detecting the feed water temperature falls below a certain temperature.
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, It is possible to provide a hot water supply apparatus that protects equipment from damage due to freezing in winter, eliminates the antifreeze heater, and simplifies the main body configuration. To provide a hot water supply apparatus that eliminates the problem of residual water boiling in the heat exchanger during operation, facilitates the structure for improving the corrosion resistance of the latent heat recovery heat exchanger, and reduces the running cost with high efficiency. But Kill.

In the second aspect of the invention, the circulation pump is operated so that the timer is counted so as to operate for a certain period of time. As a result, the circulation pump does not need to be operated more than necessary, and unnecessary power consumption can be suppressed. The third aspect of the invention is that the circulation pump is operated for a certain period of time after the circulation pump is operated for a certain period of time. The circulating pump is not operated even when the temperature is below a certain level. Thereby, unnecessary power consumption can be suppressed.

  When the temperature detection thermistor such as a bathing thermistor for detecting the bathing temperature in addition to the water supply thermistor, a heating thermistor for detecting the heating hot water temperature, or the like falls below a certain temperature, The circulation pump is operated. As a result, the temperature drop can be detected more quickly, and freezing can be prevented more reliably.

  According to a fifth aspect of the invention, a heating / warming water transport pump for transporting heating / warming water to each terminal is operated simultaneously with the operation of the circulation pump. Thereby, a heating hot water conveyance circuit can also prevent freezing.

In a sixth aspect of the invention, the burner is burned simultaneously with the operation of the circulation pump, and the hot water supply circulation circuit water is raised to a constant temperature. Accordingly, the time for operating the circulation pump can be shortened, and unnecessary power consumption can be suppressed. The seventh aspect of the invention is a heating / warming water transport pump for transporting heating / warming water to each terminal simultaneously with the operation of the circulation pump. Is operated, and the burner is combusted so that the hot water supply circuit water is raised to a certain temperature, so that the entire system can be more reliably prevented from freezing.

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

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

  In FIG. 1, first, water supplied from a water supply path 1 is heated by combustion of a burner 2 to rise to a predetermined temperature, then supplied to a hot water supply path 3, and the water supply path 1 and the hot water supply path 3 are formed in communication with each other. A part of water supplied from the water supply channel 1 from the bypass passage 4 is supplied through the bypass control valve 5 to adjust to a desired hot water, and a hot water supply circuit for discharging hot water from the hot water tap 6 is configured.

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

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

  Next, the hot water 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.

  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.

  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.

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.

  FIG. 2 shows the operating state of the circulation pump 17 in the first embodiment of the present invention.

  In FIG. 2, the circulation pump 17 is operated when the feed water thermistor 30 for detecting the feed water temperature falls below a certain temperature.

  As a result, it is possible to prevent the temperature in the winter from falling, the water in the device from freezing and the device from becoming unusable or from being damaged.

(Embodiment 2)
FIG. 3 shows the operating state of the circulation pump 17 in the second embodiment of the present invention.

In FIG. 3, the circulation pump 17 is operated for a certain time after being stopped for a certain time. This eliminates the need to operate the circulation pump more than necessary, and can suppress unnecessary power consumption (Embodiment 3).
FIG. 4 shows the operating state of the circulation pump 17 in the third embodiment of the present invention.

  In FIG. 4, after the circulating pump 17 has been operated for a certain period of time, the circulating pump 17 is not operated for a certain period of time even if the temperature of the feed water thermistor 30 is below a certain level. Thereby, unnecessary power consumption can be suppressed.

  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 The figure which shows the driving | running state of the circulation pump 17 in the same embodiment The figure which shows the driving | running state of the circulation pump 17 in the 2nd Embodiment of this invention. The figure which shows the driving | running state of the circulation pump 17 in the 3rd Embodiment of this 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 30 Water supply thermistor

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 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 After branching from the hot water supply path and supplying to the use side heat exchanger via the circulation pump, it is returned to the latent heat recovery heat exchanger and used from the latent heat recovery heat exchanger through the hot water supply heat exchanger via the circulation pump. A hot water supply circulation circuit that leads to the side heat exchanger, so that it is possible to select a path through which water flows through each of the single use of the hot water supply circuit, the single use of the hot water supply circuit, or the simultaneous use of the hot water supply circuit and the hot water supply circuit The circulating pump detects the feed water temperature Water heater feed water thermistor is to be operated with less than or equal to a predetermined temperature that. 2. The hot water supply apparatus according to claim 1, wherein the circulation pump is counted so that the operation of the circulation pump is performed for a predetermined time. The hot water supply apparatus according to claim 1, wherein after the circulating pump is operated for a certain period of time, the circulating pump is not operated for a certain period of time even if the temperature of the feed water thermistor is lower than a certain level. In addition to the water supply thermistor, when the temperature detection thermistor such as a bathing thermistor for detecting the bathing temperature or a heating thermistor for detecting the heating hot water temperature falls below a certain temperature, the circulating pump is operated. The hot water supply apparatus according to claim 1 The hot water supply apparatus according to claim 1, wherein the heating / warming water transport pump for transporting the heating / warming water to each terminal is operated simultaneously with the operation of the circulation pump. The hot water supply apparatus according to claim 1, wherein a burner is combusted simultaneously with the operation of the circulation pump to raise the hot water supply circulation circuit water to a certain temperature. A heating / warming water transport pump that transports heating / warming water to each terminal at the same time as the circulation pump operates, and burns the burner to raise the hot water circulation circuit water to a certain temperature. 1. Hot water supply device according to 1