JP2006266557A - Hot water supply heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce size and weight of an appliance and to improve efficiency by applying a single heat source for supplying hot water, heating and bathing by combining a hot water supplying-heat exchanger and a latent heat recovering-heat exchanger. <P>SOLUTION: This hot water supply heating device is provided with a hot water supply circuit formed from a water supply passage 1 to a tapping passage 3 through the latent heat recovering-heat exchanger 16 and the hot water supplying-heat exchanger 15, and a hot water supplying circulating circuit 19 for taking out the water from the hot water supplying-heat exchanger 15, supplying the water to a use-side heat exchanger 18, and returning the water to the latent heat recovering-heat exchanger 16 through a circulation pump 17, and further comprises a first burner 2A performing combustion within a predetermined rated capacity range when the hot water supply circuit 3 is used, and a second burner 2B performing combustion within the predetermined rated capacity range when the hot water supplying circulating circuit 19 is used. The first burner and the second burner have the order of priority, so that a special operation mode is released and an ordinary operation mode is returned when the operation request is done from the burner of high priority during the operation of the burner of low priority in the special operation mode. <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 and heating 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). .

  Further, when the latent heat is recovered by the latent heat recovery heat exchanger, the combustion exhaust gas is condensed to generate strongly acidic drain water. As drainage configuration of this drain water, as in Patent Document 2, there is a drain receiver provided below the heat exchanger for latent heat recovery, and drain water received by the drain receiver is drained through a neutralizer, As a structure of the neutralizer, a loading space of a substantially U-shaped trap structure for loading a neutralizing agent is provided inside, and an inlet of drain water is provided at one upper end portion of the loading space, and the other upper end portion. The thing which provided the exit which discharges the treated water neutralized in is disclosed (for example, refer patent document 2).

Moreover, as a hot water supply / room heating device provided with a heat exchanger for recovering latent heat, as disclosed in Patent Document 3, gas burners 5 and 5a, primary heat exchangers 6 and 6a, and secondary heat exchangers 7 and 7a are provided, respectively. A bath water heater 1A and a hot water heater 1B are disclosed, and the hot water heater 1A is used for hot water and bath pouring, and the hot water heater 1B is used for heating and bathing ( For example, see Patent Document 3).
JP 2002-267262 A JP 2001-241764 A JP 2001-241641 A

  However, the conventional hot water heater is provided with a hot water heat exchanger and a fluid heat exchanger in the combustion gas flow path of the burner, and the hot water heat exchanger includes a sensible heat exchanger for hot water and Since a latent heat exchange unit for hot water supply is provided and the fluid heat exchanger is provided with a sensible heat exchange unit for fluid and a latent heat exchange unit for fluid, the sensible heat exchange unit and the latent heat exchange unit are respectively provided. It is necessary to integrally form the hot water supply heat exchanger and the fluid heat exchanger, and a very complicated configuration is imposed on the hot water supply heat exchanger and the fluid heat exchanger. 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.

  In addition, the drain water generated by the heat exchanger for latent heat recovery is structured to drain the treated water neutralized by the neutralizer directly into the drainage channel, so it is as simple as a detached house. There is no problem if it is installed in an environment where it can be drained outdoors, but it cannot be drained easily outdoors in apartment buildings, such as condominiums, and a separate drain pipe is installed near the heat source unit. It was a difficult task.

  Also, in terms of capacity, conventional large water heaters and the like cannot secure a burner turn-down ratio (TDR) that covers from the minimum combustion to the maximum combustion of the appliance. It is configured separately, and if the number of combustion surfaces to be burned or the size of the combustion surface is large or small, the combination method is switched to cover from the minimum combustion to the maximum combustion of the device. The maximum capacity is determined by the preset rated capacity, and cannot be burned beyond the rated capacity. When large capacity is required, it is necessary to select and use a device with a large rated capacity. In that case, there may be various restrictions depending on the size of the rated capacity. There was no hot water heater with the capability.

  Further, as in Patent Document 3, the hot water bath heating apparatus of the two cans and three water channels system is configured with separate hot water supply circuits and heating / bath circuits, and each can body is provided with a burner. Therefore, during the heating operation, it can be burned only within the range of the maximum combustion amount of the burner provided in the can body forming the heating circuit, and during the hot water supply operation, the burner provided in the can body forming the hot water supply circuit can be burned. It could burn only within the range of the maximum amount of combustion.

  Therefore, when using in such a way that simultaneous use is frequently performed in multiple places, it can be handled by installing multiple water heaters, and each water heater is used properly according to the application. The burden on the location, piping work, and cost was great.

  The present invention solves the above-mentioned conventional problems, and forms one heating path with a hot water supply heat exchanger and a latent heat recovery heat exchanger, and uses circulating water in the heating path to form a heating circuit or a bath circuit. By adopting a structure for supplying heat, it is possible to configure a use-side heat exchanger that is not related to the heat exchanger for hot water supply and the latent heat recovery heat exchanger. The heating path is mainly composed of a hot water supply circuit, and a hot water supply burner and a heating burner are provided as a heating source for the heating path, giving priority to hot water supply performance. An easy-to-use hot water supply apparatus capable of burning a burner having a rated capacity predetermined for each function exceeding the rated capacity under a predetermined condition 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-described conventional problems, a hot water supply and heating apparatus according to 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 of the burner. A latent heat recovery heat exchanger disposed in the exhaust gas 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 so that the latent heat recovery heat is supplied from the water supply path. A hot water supply circuit that passes through the exchanger, passes through the heat exchanger for hot water supply and reaches the hot water outlet, is taken out from the hot water heat exchanger and supplied to the use side heat exchanger, and then the heat exchange for latent heat recovery is performed via a circulation pump. A hot water supply / heating system is provided in which a hot water supply circulation circuit to be returned to the heater is formed, and the use of the hot water supply circuit, the use of the hot water supply circulation circuit, or the simultaneous use of the hot water supply circuit and the hot water supply circulation circuit can be selected. A device comprising: The burner is a first burner that performs combustion within a predetermined rated capacity range when the hot water supply circuit is used, and a second burner that performs combustion within a predetermined rated capacity range when the hot water supply circulation circuit is used. And a special operation mode for permitting the operation of the second burner or the first burner with a predetermined period as an upper limit when a load request exceeding the rated capacity is made during operation of the first burner or the second burner. The hot water supply operation using the first burner and the hot water circulation operation using the second burner have a predetermined priority order, and the priority order is determined while the low priority operation side is operating in the special operation mode. When the high driving side starts operation, the special operation mode is canceled and the normal operation mode is restored.

  According to the said invention, it is set as the structure which forms one heating path | route with the heat exchanger for hot_water | molten_metal supply, and the heat exchanger for latent heat collection | recovery, and supplies heat quantity to a heating circuit or a bath circuit using the circulating water of the said heating path | route. Therefore, it is possible to configure the use side heat exchanger not related to the hot water supply heat exchanger or the latent heat recovery heat exchanger, and realize the downsizing and weight reduction of the appliance by simplifying the main body configuration including the piping configuration. In addition, it is possible to provide an easy-to-use hot water supply apparatus that prioritizes hot water supply performance by mainly using the hot water supply circuit as the heating path, and by using a single heating path configuration mainly including the hot water supply circuit. 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. Can do.

  In addition, burner combustion can be controlled within the rated capacity of the appliance within the range of normal operating conditions assumed in advance when using hot water or heating alone, and rated without exceeding the predetermined appliance rating capability. Consistency with the display can be achieved. In addition, the usage that temporarily exceeds the rated capacity, for example, when using the hot water at the same time in two places at the same time in three places, the conventional method would exceed the rated capacity and the hot water temperature In the heating operation, it takes a long time for the room temperature to rise, and it does not take a long time to warm up. In the present invention, when the required hot water supply capacity or the required heating capacity exceeds the rated capacity in the present invention, the capacity set for the hot water circulation circuit, for example, the capacity set for heating or the capacity set for hot water supply is set. Because it has a configuration that can be used temporarily, burner combustion must be performed within the capacity range that includes the required hot water supply capacity or the rated hot water capacity and the rated heating capacity for the required heating capacity. Even if three places are used at the same time, the desired hot water supply temperature and amount can be secured, and the room temperature can be raised to an appropriate temperature in a short time even when the room is cold and cold. it can. Furthermore, priority is given to the hot water supply operation and the heating operation in advance. For example, if priority is given to the hot water supply operation, even if the heating operation is operating in the special operation mode, the hot water supply operation is performed. When started, the special operation mode of the heating operation can be canceled and the hot water supply operation can be preferentially operated, and even when the hot water supply operation is used during the heating operation, the simultaneous operation can be performed without any trouble.

  In addition, the special operation mode is limited to a predetermined period and can be changed only when there is a request exceeding the rated capacity for hot water supply. The period of use exceeding the capacity is extremely short, and there is no problem in consistency with the rating display.

  The hot water supply apparatus of the present invention is configured to form one heating path with a hot water supply heat exchanger and a latent heat recovery heat exchanger, and to supply heat to a heating circuit or a bath circuit using circulating water in the heating path. This makes it possible to configure the heat exchanger on the use side that is not related to the heat exchanger for hot water supply or the latent heat recovery heat exchanger, and realizes downsizing and weight reduction of equipment by simplifying the main body configuration including the piping configuration. In addition, it is possible to provide an easy-to-use hot water supply apparatus that prioritizes hot water supply performance by using the hot water supply circuit as a main component of 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.

  Also, within normal operating conditions, burner combustion can be controlled within the rated capacity of the appliance, and even if the required hot water supply capacity or heating capacity exceeds the rated capacity, the capacity or hot water supply set for heating is used. Therefore, burner combustion is controlled within the capacity range of hot water supply demand capacity or heating capacity plus hot water rated capacity and heating rated capacity. In addition, the desired hot water supply temperature and the amount of hot water supply can be secured even when three places are used simultaneously or at the time of cold start when the room temperature has cooled down, and the room temperature can be raised to an appropriate temperature in a short time.

  Furthermore, even if the heating operation is operating in the special operation mode, when the hot water supply operation is started, the special operation mode of the heating operation can be canceled and the hot water operation can be preferentially operated. Even when hot water operation is used, simultaneous operation can be performed without any trouble.

  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, Forming a hot water supply circuit leading to the passage, and forming a hot water supply circulation circuit that is taken out from the hot water heat exchanger and supplied to the use side heat exchanger and then returned to the latent heat recovery heat exchanger via a circulation pump. A hot water supply and heating device that can select whether to use a circuit, to use a hot water supply circulation circuit, or to use a hot water supply circuit and a hot water supply circulation circuit at the same time. Predetermined when using A first burner that performs combustion within the rated capacity range and a second burner that performs combustion within a predetermined rated capacity range when the hot water supply circulation circuit is used, and the first burner or the second burner operates. When there is a load request exceeding the rated capacity, a special operation mode for permitting the operation of the second burner or the first burner with a predetermined period as an upper limit is set, and the hot water supply operation using the first burner and the The hot water circulation operation using the second burner has a predetermined priority, and when the low priority operation side is operating in the special operation mode and the high priority operation side starts operation, the special operation mode is set. It is canceled and returned to the normal operation mode.

  And by forming one heating path with the heat exchanger for hot water supply and the heat exchanger for latent heat recovery, and using the circulating water of the heating path to supply heat to the heating circuit and the bath circuit, Enables the configuration of the use side heat exchanger that is not related to the hot water supply heat exchanger or the latent heat recovery heat exchanger. By using a hot water supply circuit as a main route, it is possible to provide an easy-to-use hot water supply device that prioritizes hot water supply performance, and by adopting a single heating route configuration mainly consisting of a hot water supply circuit, It is possible to provide a hot water supply apparatus that solves the problem of residual water boiling in the exchanger, facilitates the structure for improving the corrosion resistance of the latent heat recovery heat exchanger, and achieves high efficiency and reduced running costs.

  In addition, burner combustion can be controlled within the rated capacity of the appliance within the range of normal operating conditions assumed in advance when using hot water or heating alone, and rated without exceeding the predetermined appliance rating capability. Consistency with the display can be achieved. In addition, the usage that temporarily exceeds the rated capacity, for example, when using the hot water at the same time in two places at the same time in three places, the conventional method would exceed the rated capacity and the hot water temperature In the heating operation, it takes a long time for the room temperature to rise, and it does not take a long time to warm up. In the present invention, when the required hot water supply capacity or the required heating capacity exceeds the rated capacity in the present invention, the capacity set for the hot water circulation circuit, for example, the capacity set for heating or the capacity set for hot water supply is set. Because it has a configuration that can be used temporarily, burner combustion must be performed within the capacity range that includes the required hot water supply capacity or the rated hot water capacity and the rated heating capacity for the required heating capacity. Even if three places are used at the same time, the desired hot water supply temperature and amount can be secured, and the room temperature can be raised to an appropriate temperature in a short time even when the room is cold and cold. it can. Furthermore, priority is given to the hot water supply operation and the heating operation in advance. For example, if priority is given to the hot water supply operation, even if the heating operation is operating in the special operation mode, the hot water supply operation is performed. When started, the special operation mode of the heating operation can be canceled and the hot water supply operation can be preferentially operated, and even when the hot water supply operation is used during the heating operation, the simultaneous operation can be performed without any trouble.

  In addition, the special operation mode is limited to a predetermined period and can be changed only when there is a request exceeding the rated capacity for hot water supply. The period of use exceeding the capacity is extremely short, and there is no problem in consistency with the rating display.

  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, bathroom drying, etc. as a use side heat exchanger, hot water supply or single use of heating, or hot water supply and heating Hot water supply device configured to perform hot water supply and heating using a hot water circulation circuit composed of a hot water supply heat exchanger and a latent heat recovery heat exchanger. By configuring the hot water supply and heating with a single heating path, the main body structure including the piping structure can be simplified to reduce the size and weight of the appliance, and to improve the efficiency by collecting latent heat. Therefore, hot water supply performance and heating performance can be secured at the same time.

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

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

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

  According to a sixth aspect of the present invention, the latent heat recovery heat exchanger has a stainless steel heat receiving pipe arranged in parallel through a plurality of stainless steel plate fins, and a copper water pipe is inserted through the heat receiving pipe. It is supplied from the water supply path by arranging and providing a water inlet header that collects the water inlets of the water pipe to form one water inlet path, and a water outlet header that gathers the water outlets of the water pipe and collects the water outlets. Water is supplied to a hot water supply heat exchanger through a plurality of water pipe paths, and the latent heat of the combustion exhaust gas is recovered in the process, and one heating path supplied from the water supply path This configuration simplifies the parallel arrangement of the heat receiving pipe and the water pipe, and by collecting the inlet and outlet of the water pipe at the inlet header and outlet header, a plurality of latent heat recovery heat exchangers can be installed inside the heat exchanger. Pass through the water passage Bets can be, it is possible to reduce the flow resistance of the hot water supply circulation circuit, it can be reduced in size and weight of the circulating pump.

  In a seventh aspect of the present invention, there is provided a bypass passage for bypassing the water supplied from the water supply passage to bypass the latent heat recovery heat exchanger and the hot water supply heat exchanger to the outlet hot water passage, and the bypass passage is upstream of the hot water supply circulation circuit Water is supplied from a water supply channel, mixed with high-temperature water heated by a heat exchanger for hot water supply, and desired hot water is supplied from the hot water supply channel, and is supplied from the water supply channel. A part of the water is heated via the latent heat recovery heat exchanger and the hot water supply heat exchanger, and the remaining hot water is mixed with the heated water from the bypass passage to secure the desired hot water. Thus, the heating water can be heated to a high temperature, and by increasing the hot water temperature in the hot water supply heat exchanger, condensation in the heat exchanger can be prevented and durability can be improved.

  8th invention provides the pouring circuit which supplies the hot water supplied from the hot water supply path to the bath circuit which is the secondary side of a utilization side heat exchanger, and the said pouring circuit is from the hot water supply path downstream of a bypass channel. It is characterized in that mixed hot water is supplied, and hot water efficiently heated by the heat exchanger for latent heat recovery and the heat exchanger for hot water supply is mixed with the water supplied from the bypass passage, and desired. After securing hot water, supplying the bath circuit from the pouring circuit allows efficient bath operation.

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

(Embodiment 1)
FIG. 1 is a structural diagram of a hot water supply / room heating 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, high-temperature water heated by the latent heat recovery heat exchanger 16 and the hot water supply heat exchanger 15 is supplied from the outlet of the hot water supply heat exchanger 15 to the heating heat exchanger 18 which is a direct use side heat exchanger. After that, it is returned to the upstream water supply channel 1 of the latent heat recovery heat exchanger 16 via the circulation pump 17 and passes from the latent heat recovery heat exchanger 16 through the hot water supply heat exchanger 15 to the heating heat exchanger 18. A hot water supply circulation circuit 19 is configured. Since the hot water supply circulation circuit 19 supplies hot water directly from the outlet of the hot water supply heat exchanger 15 to the use side heat exchanger, the hot water supplied from the burner 2 is used as a load on the use side. The amount of heat can be supplied, and it is most suitable when used for the heating circuit described in this embodiment.

  The heating burner 2 of the hot water supply heat exchanger 15 which is a heat supply source for the hot water supply circuit 3 and the hot water supply circulation circuit 19 is set for heating with the first burner 2A having a rated combustion input set for hot water supply. It comprises the 2nd burner 2B which has the rated combustion input made, and combusts within the rated combustion input range according to each load demand. That is, during the hot water supply operation, the combustion amount is controlled according to the hot water supply load within the rated input range in which the first burner 2A can combust, and during the heating operation, according to the heating load within the rated input range in which the second burner 2B can combust. Within the rated input range for the bath, which is set within the range where the hot water supply performance is not affected when the hot water and the bath are operated simultaneously within the rated input range where the first burner 2A can burn during bath operation. The amount of combustion is controlled. The state of operation within the rated combustion input range set for each function is referred to as a rated operation mode, and the conventional two-can three-water channel hot water bath heater can only be operated in the rated operation mode. In other words, in the conventional hot water bath heating device, the hot water bath circuit and the heating circuit are composed of separate can bodies, and each can body has an independent configuration with a burner. It can be burned only within the range of the maximum combustion amount of the burner provided in the body, and can be burned only within the range of the maximum combustion amount of the burner provided in the can body forming the hot water supply circuit during hot water supply operation. It was impossible.

  In the present embodiment, as described above, the hot water heated by the hot water supply heat exchanger 15 and the latent heat recovery heat exchanger 16 is directly used for hot water supply, and the hot water circulation circuit 19 is formed and the circulating water is used. As a burner 2 that heats the heat exchanger 15 for hot water supply, the first burner 2A and the second burner 2B that are set in advance with the rated input are used. Because of the integrated configuration, it is possible to operate not only in the rated operation mode but also in the special operation mode exceeding the rated input in each function under a predetermined condition.

  The heating circuit 20 is connected to a load such as a radiator 21 on the secondary side of the heating heat exchanger 18 to form a closed circuit, and is circulated by the heating circulation pump 22, whereby the heating heat exchanger 18. Thus, heat is exchanged with the high-temperature water supplied from the hot water supply circuit 19 so as to ensure the amount of heating heat.

  The operation and action of the hot water heater configured as described above will be described 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 2A, and combustion is started by an ignition operation. Combustion gas generated by the combustion start of the burner 2 </ b> A is discharged from the exhaust port 14 through the exhaust passage 13 from the combustion chamber 12. In the process of exhausting the combustion gas, the water supplied from the water supply passage 1 is heated by the hot water supply heat exchanger 15 disposed in the combustion chamber 12 and the latent heat recovery heat exchanger 16 disposed in the exhaust passage 13. .

  The hot water heated to a predetermined temperature by the hot water supply heat exchanger 15 is provided by connecting the hot water supply path 1 and the hot water supply path 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 water on the incoming side by a bypass control valve 5 disposed in the bypass passage 4. 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, a plurality of hot-water taps 6 are installed, and when the hot water is discharged from the plurality of hot-water taps 6 at the same time, even if the burner 2A burns at the maximum combustion amount of the rated input, the remote control 24 for remote operation is set. The hot water supply temperature may not rise. In other words, when used simultaneously with a plurality of hot water taps 6, the amount of water flow through the hot water heat exchanger 15 increases, resulting in an insufficiency state that cannot be heated to a predetermined temperature with the rated input of the burner 2A. In such a case, conventionally, it has been necessary to use within the rated capacity range of the burner 2A by restricting the use location. Therefore, in the present embodiment, when the outlet temperature of the hot water supply heat exchanger 15 does not rise to a predetermined temperature even when the burner 2A burns at the maximum combustion amount of the rated input, the heating burner of the hot water supply circulation circuit 19 is used. Even if the burner 2B is used at the same time by switching to the special operation mode in which the burner 2B starts to burn and simultaneously burning the burner 2A and the burner 2B, the hot water supply heat exchanger 15 is heated. The hot water temperature is secured.

  The special operation mode is limited to a predetermined period and can be combusted. When the predetermined period ends, or when the hot water supply load decreases within the rated capacity range of the burner 2A within the predetermined period, the special operation mode is released. Return to the rated operation mode. By limiting the period of the special operation mode that operates beyond this rated input, it is possible to achieve consistency with each capacity display displayed on the appliance, for example, a hot water supply capacity display, a heating capacity display, and a bath capacity display. is there.

  As described above, when selecting the hot water supply single operation, the rated operation mode and the special operation mode are automatically selected according to the hot water supply load by setting a desired temperature with the remote control remote controller 24 and opening the hot water tap 6. Therefore, even if the hot water taps 6 are used at the same time, hot water having a set hot water temperature can be secured.

  Next, at the time of heating operation, the heating circulation pump 22 provided in the heating circuit 20 is driven by an operation command of a controller (not shown) built in the heating terminal device such as the radiator 21, and the operation command is linked. Then, the circulation pump 17 for circulating the hot water in the hot water supply circulation circuit 19 is driven, and at the same time, combustion is started by the ignition operation of the burner 2B. The combustion gas generated by the start of combustion of the burner 2B 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. The heat of the heating circuit 20 received by the heating heat exchanger 18 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.

  In this way, hot water supplied to the heating heat exchanger 18 is directly taken out from the outlet of the hot water supply heat exchanger 15 to form a hot water supply circulation circuit 19, thereby securing high-temperature water necessary for the heating operation and heating. By branching off from the hot water supply circulation circuit 19 on the downstream side of the heat exchanger 18 and taking out the hot water supply circuit 3, it is possible to ensure hot water supply priority operation capable of efficiently supplying hot water in the hot water use range.

  Here, the latent heat recovery heat exchanger 16 that recovers the latent heat of the combustion exhaust gas is located downstream of the hot water supply heat exchanger 15 with respect to the exhaust gas path, and is upstream of the hot water supply heat exchanger 15 with respect to the water supply path. The hot water heated by the latent heat recovery heat exchanger 16 is heated by the hot water supply heat exchanger 15. As a result, the amount of heat generated by the combustion of the burner 2B can be efficiently exchanged, leading to energy saving.

  Further, in the heating operation, there is no problem in the normal operation in which the heating load determined by the size of the room, the outside air temperature, etc. is operated within the rated input range of the burner 2B, but the room is cooled in the initial stage of the heating operation. In such a case, even if the burner 2B burns at the maximum combustion amount of the rated input, it takes a long time for the room temperature to rise to an appropriate temperature. Therefore, in the present embodiment, at the time of cold start in which the heating operation is started in a state where the room is completely cooled, in addition to the burner 2B, combustion of the burner 2A which is a heating burner of the hot water supply circuit 3 is started, and the burner 2B and the burner are started. By switching to the special operation mode in which 2A is simultaneously burned and heating the hot water supply heat exchanger 15, an early start-up performance of the room temperature at the cold start is ensured.

  The special operation mode is limited to a predetermined period to allow combustion, and is released when the predetermined period ends, or when the heating load decreases within the rated capacity range of the burner 2B within the predetermined period. Return to the rated operation mode. By limiting the period of the special operation mode that operates beyond this rated input, it is possible to achieve consistency with each capacity display displayed on the appliance, for example, a hot water supply capacity display, a heating capacity display, and a bath capacity display. is there.

  As described above, when selecting the heating single operation, the rated operation mode and the special operation mode are automatically selected according to the heating load at the start of the heating operation, so that the early start-up performance of the room temperature is ensured. be able to.

  Next, using numerical values as an example of the rated operation mode and the special operation mode, the heating rated input of a normal hot water heater is 15000 kcal / h, and the hot water rated input is 45000 kcal / h, which are set independently. Has been. At least one of a second burner (heating burner) 2B having a total combustion input of 60000 kcal / h and a combustion input of 15000 kcal / h and a first burner (hot water supply burner) 2A having a combustion input of 45000 kcal / h It can burn.

  Then, at the time of a cold start where heating operation is first required such as early morning, the circulation pump 17 and the heating circulation pump 22 are driven as a special operation mode, and the air and gas of the combustion fan 11 are mixed by the burner 2 and the combustion input is 60000 kcal / Start maximum combustion of h. That is, by burning the first burner 2A and the second burner 2B simultaneously, when the combustion heat passes through the hot water supply heat exchanger 15 and the latent heat recovery heat exchanger 16, a large amount of heat is transferred to the heat absorption pipe via the fins. heat. The hot water absorbed by the heat absorption pipe circulates in the hot water supply circulation circuit 19 by the circulation pump 17 and heats the warm water in the heating circuit 20 by the heating heat exchanger 18, so that the heating rise time is set to the rated combustion input of 15000 kcal / h. Compared to the single operation of the second burner 2B, it is possible to significantly shorten the operation.

  An actual example will be described with reference to FIG. 2. When a cold start is first required for heating operation such as early morning, a heating amount of about 7000 kcal is necessary, exceeding the rated operation mode of 15000 kcal / h, and in the special operation mode. The first burner 2A and the second burner 2B constituting the burner 2 are combusted simultaneously up to a combustion input of 60000 kcal / h, so that heating is rapidly started, and it takes 60 minutes to reach 20 ° C. from room temperature. Can be realized in 30 minutes.

  Further, as shown in FIG. 3, the latent heat recovery heat exchanger 16 has a side plate 16a, 16b made of stainless steel, a plate fin 16c made of stainless steel arranged between the side plates 16a, 16b, Stainless steel sheath pipes 16d that are arranged side by side through openings provided in the side plates 16a and 16b and the plate fins 16c, and a plurality of copper pipes that are internally passed through the sheath pipe 16d and are provided with a water inlet 16e and a water outlet 16f. A water inlet pipe 16g, a water inlet header 16h that gathers the water inlet 16e of the water pipe 16g to form one water inlet path, and a water outlet header that gathers the water outlet 16f of the water pipe 16g to form a water inlet path. 16i, and the water pipe 16g has a double pipe structure in the exhaust gas path, and the heat exchange path in parallel through the water inlet header 16h and the water outlet header 16i. And so as to form a.

  With this configuration, the water supplied from the water supply channel 1 flows in parallel through the plurality of water pipes 16g from the water inlet header 16h, gathers at the water outlet header 16i, and is supplied to the hot water supply heat exchanger 15. And since the inside of the exhaust gas path covers the water conduit 16g with a stainless steel sheath tube 16d, the problem of corrosion due to condensed water is also suppressed, and the heat efficiency can be improved by recovering the latent heat in the combustion exhaust gas. it can.

  Further, by collecting the water inlet 16e and the water outlet 16f of the water pipe 16g with the water inlet header 16h and the water outlet header 16i, the latent heat recovery heat exchanger 16 can be passed through a plurality of water passages, The passage resistance of the hot water supply circulation circuit 19 can be reduced, and the circulation pump 17 can be reduced in size and weight. Furthermore, the arrangement of the water pipe 16g is simplified by simplifying the arrangement structure of the water pipe 16g by gathering on one side of the water pipe 16g to form the water inlet path and the water outlet path.

  As described above, in the present embodiment, one heating path is formed by the hot water supply heat exchanger 15 and the latent heat recovery heat exchanger 16, and the use side load circuit utilizes the circulating water of the heating path. Since the heat amount is supplied to the heating circuit 20, it is possible to configure the heating heat exchanger 18 that is a use side heat exchanger not related to the hot water supply heat exchanger 15 and the latent heat recovery heat exchanger 16. The simplification of the main body configuration including the piping configuration can reduce the size and weight of the appliance, and can provide an easy-to-use hot water supply device that prioritizes the hot water supply performance by mainly using the hot water supply circuit as the heating path. Moreover, by adopting a single heating path configuration mainly composed 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 latent heat recovery heat exchanger 16 can be improved. Easy to configure And, it is possible to provide a water heater which thereby reducing the running cost with high efficiency.

  In addition, it is possible to control the burner combustion within the rated capacity of the appliance within the range of normal use conditions, and even if the hot water required capacity or heating capacity exceeds the rated capacity, it is set for heating or hot water. Since the capacity can be temporarily used, the burner combustion can be controlled within the capacity range that includes the hot water rated capacity and heating rated capacity in addition to the hot water required capacity or the required heating capacity. Even when used at a plurality of locations at the same time, the desired hot water supply temperature and amount of hot water can be secured, and the room temperature can be raised to an appropriate temperature in a short time even during cold start heating operation where the room temperature has cooled down.

(Embodiment 2)
Next, a hot water supply and heating apparatus according to a second embodiment of the present invention will be described with reference to FIG.

  This embodiment relates to a hot water heater using a bath heat exchanger that supplies heat to a bath circuit that replenishes the bath as a use side heat exchanger of the hot water heater in the first embodiment. It is.

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

  Next, the operation and action will be described. When bath operation is instructed by the remote control remote controller 24 during bath operation, the bath circulation pump 29 provided in the bath circuit 28 is driven and the water flow detection unit 30 performs bath water. When the circulation is detected, the circulation pump 17 that circulates the hot water in the hot water supply circuit 19 is driven by the detection signal, and at the same time, the combustion is started by the ignition operation of the first burner 2A. In the present embodiment, the first burner 2A is used as a heat source during bath operation. However, similar effects can be obtained by using the second burner 2B.

  The combustion gas generated by the start of combustion of the first burner 2A 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 bath heat exchanger 27 by the circulation pump 17, and heat is exchanged by the water-water heat exchange configuration and is transferred to the bath circuit 28. The heat of the bath circuit 28 received by the bath heat exchanger 27 raises the hot water temperature of the bathtub 31 to ensure a predetermined hot water temperature. Then, the high-temperature water heat-exchanged by the bath heat exchanger 27 is returned to the upstream water supply channel 1 of the latent heat recovery heat exchanger 16 to form a hot water supply circulation circuit 19, and a predetermined set by the remote-control remote controller 24. The circulation is continued at a predetermined hot water temperature until the reheating condition is satisfied.

  Also, in the bath chasing operation, as long as the bath water is kept at a certain temperature and is slightly chased, there is no problem in the rated operation mode in which the operation is performed within the predetermined bath rated input range. When the bath is reheated when the water is cold, even if the first burner 2A is used to burn at the maximum combustion amount of the bath rated input, the temperature rises to the bath set temperature set by the remote control remote control 24 It takes a long time. Therefore, in the present embodiment, when the bath reheating operation is started in a cold start state in which the bath water has cooled, in addition to the first burner 2A, the combustion of the second burner 2B which is the heating burner of the hot water supply circulation circuit 19 is performed. Is started, and the hot water supply heat exchanger 15 is heated by switching to the special operation mode in which the first burner 2A and the second burner 2B are simultaneously burned, thereby ensuring the early start-up performance of the bath water temperature at the cold start. I am doing so.

  The special operation mode can be burned for a predetermined period of time, and is released when the predetermined period ends or when the bath water temperature rises and the load falls within the rated capacity range of the bath. The normal rated operation mode is restored. By limiting the period of the special operation mode that operates beyond this rated input, it is possible to achieve consistency with each capacity display displayed on the appliance, for example, a hot water supply capacity display, a heating capacity display, and a bath capacity display. is there.

  In this way, when selecting a bath only operation, the rated operation mode and the special operation mode are automatically selected according to the bath load at the start of the bath operation. Can be secured.

  An actual example will be described with reference to FIG. When reheating the bath water stored on the day before winter, a heating amount of about 6000 kcal is required, exceeding the rated combustion input of 11000 kcal / h, which is the normal rated operation mode, to the combustion input of 60000 kcal / h in the special operation mode. What was required for 32 minutes to boil from 10 ° C. to 40 ° C. with 200 L of bath water can be boiled in 19 minutes by rapid reheating of the first burner 2A and the second burner 2B.

  In this way, hot water supplied to the bath heat exchanger 27 is directly taken out from the outlet of the hot water supply heat exchanger 15 to form the hot water supply circulation circuit 19, thereby ensuring high-temperature water necessary for bath operation, and for bath use. By branching off from the hot water supply circulation circuit 19 on the downstream side of the heat exchanger 27 and taking out the hot water supply circuit 3, it is possible to ensure hot water supply priority operation capable of efficiently supplying hot water in the hot water use range.

  Here, the latent heat recovery heat exchanger 16 that recovers the latent heat of the combustion exhaust gas is located downstream of the hot water supply heat exchanger 15 with respect to the exhaust gas path, and is upstream of the hot water supply heat exchanger 15 with respect to the water supply path. The hot water heated by the latent heat recovery heat exchanger 16 is heated by the hot water supply heat exchanger 15. As a result, the amount of heat generated by the combustion of the burner 2 can be efficiently exchanged even during the bath chasing operation, leading to energy saving.

  Further, by supplying hot water mixed in the pouring circuit 32 from the hot water outlet 3 on the downstream side of the bypass passage 4, the hot water is efficiently heated by the latent heat recovery heat exchanger 16 and the hot water supply heat exchanger 15. After the hot water is mixed with the water supplied from the bypass passage 4 to secure the desired hot water, the hot water is supplied to the bath circuit 28 from the pouring circuit 32, thereby enabling an efficient bath operation.

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

  In addition, burner combustion can be controlled within the rated capacity of the appliance within the normal operating conditions, and even if the required bath capacity exceeds the rated capacity, the capacity set for heating and hot water supply is temporarily stored. Because it is configured so that it can be used on a regular basis, the burner combustion can be controlled within the capacity range including the hot water supply rated capacity and the heating rated capacity in addition to the required bath capacity, and the cold bath water is cold. The bath water can be raised to an appropriate temperature in a short time during the start-up bathing operation.

(Embodiment 3)
Next, a hot water supply / room heating apparatus according to a third embodiment of the present invention will be described with reference to FIG.

  This embodiment is a heating heat exchanger that supplies heat to a heating circuit having a radiator 21 that performs heating, bathroom drying, etc., as a use-side heat exchanger of the hot water heater in the first embodiment, The present invention relates to a hot water supply and heating device using a heat exchanger for a bath that supplies heat to a bath circuit that replenishes the bath.

  The heat exchanger 18 for heating and the heat exchanger 27 for bath 27 are connected in parallel to the hot water supply circulation circuit 19, and the high-temperature water heated by the latent heat recovery heat exchanger 16 and the hot water supply heat exchanger 15 is circulated by the circulation pump 17. Then, heat is exchanged to supply heat to the heating circuit 20 or the bath circuit 28.

  Next, the operation and action will be described. During the heating operation, the heating pump 22 provided in the heating circuit 20 is driven by the operation command of the radiator 21, and the pump 17 that circulates the hot water in the hot water supply circulation circuit 19 in conjunction with it. By driving, the hot water heated by the hot water heat exchanger 15 that ignites the second burner 2B and collects the burned heat is heat-exchanged by the heating heat exchanger 18 and transferred to the heating circuit 20. The heat of the heating circuit 20 received by the heating heat exchanger 18 is radiated as warm air by the radiator 21.

  Further, during bath operation, when the bath circulation pump 29 provided in the bath circuit 28 is driven by the operation command of the remote control remote controller 24 and the circulation is detected by the water flow detection unit 30, the hot water supply circulation circuit 19 is interlocked. When the pump 17 for circulating the hot water is driven, the first burner 2A is ignited, and the hot water heated by the hot water supply heat exchanger 15 for recovering the burned heat is heat-exchanged by the bath heat exchanger 27 and bathed. Heat is transferred to the circuit 28. The heat of the bath circuit 28 received by the bath heat exchanger 27 is circulated to the bathtub 31 and reheated.

  During simultaneous heating and bath operation, the heating circuits 20 and the pumps 22 and 29 of the bath circuit 28 are driven by the operation commands from the radiator 21 and the remote control remote controller 24 to ignite the first burner 2A and the second burner 2B. Combustion is started by operation. By this combustion, the circulating water in the hot water supply circuit 19 is heated by the latent heat recovery heat exchanger 16 and the hot water heat exchanger 15 and circulates while maintaining a predetermined high-temperature water state. This high-temperature circulating water is supplied to the heating heat exchanger 20 and the bath heat exchanger 27 at substantially the same temperature, and is transferred to the heating circuit 20 and the bath circuit 28.

  Moreover, simultaneous operation by a combination other than the above is possible, and the heat exchanger 20 for heating and the heat exchanger 27 for bath 27 are configured in parallel to the hot water supply circulation circuit 19, so that the passage resistance of the circulation circuit is reduced. Therefore, the circulation pump 17 can be reduced in size and weight.

  Here, the simultaneous operation by each combination will be described in detail. For example, in the case of simultaneous operation of a hot water supply circuit and a heating circuit, when each circuit is used with a load within the rated input range, the first burner 2A and the first The 2-burner 2B can be operated by controlling the combustion amount within the rated input range in accordance with each load requirement. However, if one of the load requirements exceeds the rated input range and the operation is continued as it is, the operation must be performed in a state where the supply capability is insufficient to meet the load requirement. Therefore, in this embodiment, when each operation mode is operated simultaneously, a priority order is set, and when there is a load request exceeding the rated input from an operation mode with a high priority, switching to the special operation mode is permitted. Like to do. For example, when performing hot water supply operation and heating operation simultaneously, give priority to hot water supply operation, and if the hot water supply load is used beyond the rated input, the heating operation is restricted or paused for heating The second burner 2B, which is a burner, is used as a heat source for hot water supply. Thereby, even when it becomes the condition where the hot water supply load which is used simultaneously in several places becomes large, desired hot water can be ensured. In addition, when the hot water supply load falls within the rated input range or when the predetermined period ends, the special operation mode is canceled and the rated operation mode is restored, so the heating operation is temporarily limited or stopped. However, there is no big influence.

  In addition, when the heating operation is performed in the special operation mode in the initial stage of the heating operation, when the hot water supply operation having a high priority is started, the special operation mode of the heating operation is canceled and returned to the normal operation mode, Furthermore, if the hot water supply load exceeds the rated input, the hot water supply priority operation is ensured by switching the hot water supply operation to the special operation mode with the heating operation restricted or temporarily stopped. And when the period of the special operation mode of the heating operation is not completed at the time when the hot water supply operation is finished, the heating operation is returned to the special operation mode again to continue the heating operation, and when the predetermined period is finished, Alternatively, when the heating load drops below the rated input range, the special operation mode is canceled and the normal operation mode is restored. In the present embodiment, as a condition for switching to the special operation mode of the heating operation after the hot water supply operation is completed, the switching can be performed within the period set at the beginning of the heating operation. The period may be set again, and it may be determined according to the state of the heating load at the end of the hot water supply operation, and is not limited to the present embodiment.

  In addition, in the case of simultaneous operation of other combinations, for example, hot water supply operation and bath reheating operation, priority is given to the hot water supply operation as described above, but first, the first burner 2A and the second burner 2B are burned simultaneously, If the supply capacity for the hot water supply load is still insufficient, the bath chasing operation is restricted or temporarily stopped, and the first burner 2A and the second burner 2B are used as heat sources for hot water supply. Thereby, even when it becomes the condition where the hot water supply load which is used simultaneously in several places becomes large, desired hot water can be ensured. In addition, when the hot water supply load falls within the rated input range or when the predetermined period ends, the special operation mode is canceled and the rated operation mode is restored. Even if it stops, there is no big influence.

  Next, when bathing and heating operation are performed simultaneously, priority is given to bathing operation, and heating operation is restricted or paused when the bath load exceeds the rated input. As a state, the 2nd burner 2B which is a heating burner is utilized as a heat source for bathing. This makes it possible to start up to a desired hot water temperature in a short time even when a chasing operation is performed from a state where the bath water is cold and the bath load is large. In addition, the special operation mode is canceled when the bath load decreases within the rated input range or the predetermined period ends, and the heating operation is temporarily limited or stopped because the mode is returned to the rated operation mode. However, there is no big influence.

  Also, when performing hot water supply operation, bath reheating operation and heating operation at the same time, give priority to hot water operation, and if the hot water supply load exceeds the rated input, bath reheating operation and heating operation The second burner 2B, which is a heating burner, is used as a heat source for hot water supply.

  As described above, when simultaneously operating a plurality of operation modes, give priority to the operation modes, and switch from the rated operation mode to the special operation mode when a high priority operation mode makes a load request exceeding the rated input. Thus, by releasing the special operation mode when a predetermined condition is satisfied, a plurality of simultaneous operations can be performed while ensuring hot water supply priority operation.

  Here, the latent heat recovery heat exchanger 16 that recovers the latent heat of the combustion exhaust gas is located downstream of the hot water supply heat exchanger 15 with respect to the exhaust gas path, and is upstream of the hot water supply heat exchanger 15 with respect to the water supply path. The hot water heated by the latent heat recovery heat exchanger 16 is heated by the hot water supply heat exchanger 15. Thereby, the heat quantity generated by the combustion of the burner 2 can be efficiently exchanged even during operation of a plurality of usage-side loads, leading to energy saving.

(Embodiment 4)
Next, a hot water heater according to the fourth embodiment of the present invention will be described with reference to FIG.

  In the present embodiment, similarly to the first to third embodiments, a hot water supply circuit for heating hot water supplied from the water supply passage 1 by the hot water supply heat exchanger 15 and supplying hot water to the hot water supply passage 3, and for hot water supply After being taken out from the heat exchanger 15 and supplied to the use side heat exchanger, the hot water supply circulation circuit 19 reaches the hot water supply heat exchanger 15 via the hot water supply circulation pump 17, and heating heat as the use side heat exchanger. A heating circuit 20 in which hot and cold water circulates between the exchanger 18 and a radiator 21 that is a heating device that performs heating, bathroom drying, and the like, and heat for the bath as the use side heat exchanger A bath circuit 28 in which hot and cold water circulates between the exchanger 27 and the bathtub 31 via a bath circulation pump 29 is provided.

  The hot water circulation pump 17 and the gas proportional valve 8 that adjusts the amount of gas supplied to the burner 2 are controlled by the control device 43, and the control device 43 is controlled by a kitchen remote control 24a, which is a remote control remote control. A command such as temperature is issued from the heating remote controller 24b, the bathroom remote controller 24c, or the like.

  From the above configuration, only the hot water supply heat exchanger 15 heats water to make hot water, and all the functions such as hot water supply, heating, bathing, etc. are performed on the hot water heated by the hot water supply heat exchanger 15. Therefore, the full capacity of the hot water supply heat exchanger 15 can be used if necessary when performing any one of functions such as hot water supply, heating, and bathing. Thereby, compared with the case where the heating means is provided for each function, the result is that the capability of each function is improved.

  In the hot water supply circuit 3, as described above, the latent heat recovery heat exchanger 16 is provided downstream of the exhaust passage 13 that is the combustion exhaust gas path of the burner 2 of the hot water supply heat exchanger 15 and upstream of the water supply path 1. Has been placed.

  Accordingly, water or the like supplied from the water supply channel 1 is first preheated to some extent by the latent heat recovery heat exchanger 16 and then heated by the hot water supply heat exchanger 15.

  Below the latent heat recovery exchanger 16, there is provided a latent heat recovery heat exchanger tray 16j that receives condensed water from the latent heat recovery heat exchanger 16, and water received by the latent heat recovery heat exchanger tray 16j. A neutralizing device 42 is provided for neutralizing and draining water.

  The neutralizing device 42 is provided with an electrode 42a for detecting the water level in the neutralizing device 42, and a signal from the electrode 42a is sent to the control device 43. Then, the water accumulated in the neutralizing device 42 is discharged out of the appliance by the drain pump 42b through the check valve 42c, and drained through a drain pipe connected to the drain outlet of the bathtub. The drain pump 42b is configured to perform a drain operation by being supplied with an ON / OFF signal from the control device 43 in accordance with a signal sent from the electrode 42a.

  Further, as shown in FIG. 5, the neutralizing device 42 includes a container 42g integrally formed with a plurality of neutralizing agent storage chambers 42e and a neutralized water storage chamber 42f partitioned by a partition plate 42d, and an upper portion of the container 42g. The lid 42h covers the opening, and the lid 42h has a water inlet for introducing condensed water supplied from the latent heat recovery heat exchanger tray 16j to a portion corresponding to the most upstream side of the neutralizing agent storage chamber 42e. 42i is provided, an electrode 42a is provided on the lid 42h corresponding to the neutralized water storage chamber 42f, and a water outlet 42j for taking out the neutralized water is provided below the neutralized water storage chamber 42f. . The neutralizing agent storage chamber 42e is filled with granules such as magnesium oxide and calcium carbonate as a neutralizing agent 42k in order to neutralize strongly acidic condensed water supplied from the latent heat recovery heat exchanger tray 16j. ing.

  The neutralizing device 42 configured in this way is configured to remove acidic condensed water generated when heat is exchanged in the latent heat recovery heat exchanger 16 disposed in the exhaust passage 13, in the latent heat recovery heat exchanger tray 16 j. The partition provided on the most downstream side is neutralized by passing through a substantially U-shaped neutralizing agent 42k supplied from the water inlet 42i through a pipe and filled in the neutralizing agent storage chamber 42e. It is sent to the neutralized water storage chamber 42f from the slit hole above the plate 42d and stored until it reaches a predetermined water level.

  And if the water level of the neutralization water storage chamber 42f rises to the electrode 42a provided above, the drainage pump 42b will be driven and drained from the water outlet 42j, and if it falls to the electrode 42a provided below, the drainage pump 42b will be stopped. By repeating this process, the dew condensation water generated in the latent heat recovery heat exchanger 16 is forcibly discharged to a drain outlet of a bathroom or the like. Further, a check valve 42c is connected to the drainage path from the water outlet 42j so as to prevent backflow when the drainage pump 42b is stopped. By providing this check valve 42c, the volume of the neutralized water storage chamber 42f can be reduced, and the space in the instrument can be saved by reducing the size of the neutralizer 42.

  Further, the heating circuit 20 is provided with a tank 44 that heats hot water heated on the secondary side of the heating heat exchanger 18 to the radiator 21 by the heating circulation pump 22 to radiate heat and temporarily stores the returned hot water. Yes. This absorbs an increase in volume when hot water expands during heating, and compensates for a decrease in the amount of hot water circulating in the heating circuit 20 due to evaporation or the like. The tank 44 is provided with a water level gauge 44 a that measures the amount of hot water contained in the tank 44. Further, when the water level in the tank 44 falls below a certain value, water is replenished by a replenishment pipe 45 branched from the water supply channel 1 and connected to the tank 44, and the heating circuit 20 Prevents the water from emptying. On the other hand, the hot water overflowing the tank 44 is discarded.

  The heating circulation pump 22 is controlled by the heating remote controller 24b via the control device 43. The water level gauge 44 a is connected to the control device 43, and the water level data in the tank 44 is sent to the control device 43.

  In the bath circuit 28, hot water filled in the bathtub 31 is pumped up by the bath circulation pump 29, sent to the secondary side of the bath heat exchanger 27, and heated (reheated). The heated hot water is supplied to the bathtub 31. It comes to return. The bath circulation pump 29 is controlled via the control device 43 by the bathroom remote controller 24c.

  Next, control of the hot water supply circulation pump 17 by the control device 43 during hot water supply, heating, and chasing will be described.

  When hot water supply is started after the hot water supply is stopped, hot water (so-called “dead water”) that is not used because it is not sufficiently heated is generated. In order to eliminate this, the control device 43 operates the hot water supply circulation pump 17 from time to time even when hot water supply is stopped, so as to keep the temperature of the hot water circulated by the hot water supply heat exchanger 15 above a certain level. Thereby, dead water can be reduced and hot water can be supplied immediately at the time of hot water supply start.

  Further, when the hot water supply is stopped, the hot water supply is stopped when the hot water tap 6 is closed, and the water supply is also stopped. In the hot water supply heat exchanger 15, the hot water remaining in the hot water supply heat exchanger 15 is further heated by the remaining heat (so-called “so-called hot water supply”). "After boiling"), the next time the hot water tap 6 is opened, hot hot water will be discharged first, which is dangerous. Therefore, the control device 43 operates the hot water supply circulation pump 17 to circulate hot water for a while after stopping the hot water supply, and stops the hot water supply circulation pump 17 after the remaining heat of the hot water supply heat exchanger 15 is reduced. Control.

  Next, control during heating will be described.

  The control device 43 controls the flow rate of the hot water supply circulation pump 17 in accordance with the size of the heating load.

  When the load of the radiator 21 that is a heating device is large, that is, when the amount of heat released by the radiator 21 as heating is large, the amount of heat that must be supplied from the heating heat exchanger 18 to the heating circuit 20 increases. The hot water circulation pump 17 is controlled to increase the flow rate of hot water circulating through the hot water supply circulation circuit 19 so that a large amount of heat can be transmitted to the heating circuit 20.

  On the other hand, when the heating load is small, the flow rate of the hot water supply circulation pump 17 is controlled to be reduced. That is, when a large amount of hot water is circulated to the heating heat exchanger 18 by the hot water supply circulation pump 17 even though the heating load is small, the hot water is returned to the hot water supply heat exchanger 15 as it is. Decreases. For this reason, the thermal efficiency is prevented from being reduced by reducing the flow rate of the hot water supply circulation pump 17.

  In addition, the flow rate of the hot water supply circulation pump 17 is controlled to increase at the start of heating so that a large amount of hot water circulates in the heating heat exchanger 18 at the start of heating. Thereby, it can be made to become warm immediately at the time of heating start-up.

  Further, when the flow rate of hot water supplied from the hot water supply passage 3 is a certain amount (for example, about 10 L / min) or more, sufficient hot water is supplied to the heating heat exchanger 18 without turning the hot water supply circulation pump 17. Therefore, the hot water supply circulation pump 17 is controlled to be stopped. Thereby, power consumption can be reduced.

  When heating is performed in parallel with hot water supply, the flow rate of the hot water supply circulation pump 17 is controlled to be reduced or stopped. That is, in the case where hot water supply and heating are performed in parallel, if the flow rate of the hot water supply circulation pump 17 is increased when the water supply water pressure is low (for example, about 50 kPa or less), the circulating hot water pressure exceeds the water supply pressure. Therefore, the amount of hot water can be reduced by reducing the amount of circulating hot water, thereby preventing a decrease in the amount of hot water and increasing the amount of hot water.

  As described above, during hot water supply, heating, or simultaneous operation, the load requirement is satisfied in the special operation mode in which combustion exceeds the rated input according to the load, and the flow rate control of the hot water supply circulation pump 17 is performed according to the load. Thus, it is possible to provide operation without capacity shortage for a wider range of load requirements.

  Next, control during chasing will be described.

  The control device 43 controls the flow rate of the hot water supply circulation pump 17 according to the size of the additional load. When the reheating load of the bath is large, that is, when reheating the hot water filled in the bathtub 31 with a large temperature difference, the amount of heat that must be supplied from the bath heat exchanger 27 to the bath circuit 28 is large. Become. For this reason, by controlling so that the flow rate of the hot water circulated by the hot water supply circulation pump 17 is increased, a large amount of heat can be transmitted to the bath circuit 28.

  In addition, when bathing is performed in parallel with hot water supply, the flow rate of the hot water supply circulation pump 17 is controlled to be reduced or stopped. This is because, when performing hot water supply and bath retreating in parallel, when the water supply water pressure is low (for example, about 50 kPa or less), if the flow rate of the hot water supply circulation pump 17 is increased, the pressure of the circulating hot water is increased. This is because the water supply is suppressed by overcoming the pressure and the water supply amount is reduced. Therefore, by reducing the amount of circulating hot water, it is possible to prevent a decrease in the amount of water supply and increase the amount of hot water supply.

  As described above, during hot water supply, bathing or simultaneous operation, the load requirement is satisfied in the special operation mode in which combustion exceeds the rated input according to the load, and the flow rate control of the hot water supply circulation pump 17 is controlled according to the load. By doing so, it is possible to provide operation without capacity shortage for a wider range of load requirements.

  As described above, the hot water supply and heating device according to the present invention is a downsized appliance by using a hot water supply circulation circuit as a main circuit and hot water supply and heating, or hot water supply and bath, or hot water supply, heating, and bath as a single heat source.・ Because it can be reduced in weight, installation space is secured, workability is improved, and a 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 gas and oil hot water bath equipment and hot water heaters.

Structure diagram of hot water supply and heating device in Embodiments 1 to 4 of the present invention The figure which shows an example of the heating operation of the hot-water supply heating apparatus in Embodiment 1 of this invention Structure diagram of latent heat recovery heat exchanger of the hot water heater The figure which shows an example of the bath operation of the hot-water supply heating apparatus in Embodiment 2 of this invention Structure diagram of neutralization apparatus in Embodiment 4 of the present invention

Explanation of symbols

1 Water supply path 2 Burner (heating means)
2A 1st burner 2B 2nd burner 3 Hot water outlet 13 Exhaust passage (exhaust heat passage)
DESCRIPTION OF SYMBOLS 15 Heat exchanger for hot water supply 16 Heat exchanger for latent heat recovery 16j Heat exchanger tray for latent heat recovery 17 Circulating pump for hot water supply 18 Heat exchanger for heating (use side heat exchanger)
DESCRIPTION OF SYMBOLS 19 Hot-water supply circulation circuit 20 Heating circuit 21 Radiator 22 Heating circulation pump 23 Flow rate sensor 27 Bath heat exchanger (use side heat exchanger)
28 Bath Circuit 29 Circulation Pump for Bath 31 Bathtub 42 Neutralizer 44 Tank

Claims (8)

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 Equipped with
The hot water supply heat exchanger and the latent heat recovery heat exchanger are connected in series to form a hot water supply circuit from the water supply path through the latent heat recovery heat exchanger to the hot water supply path through the hot water supply heat exchanger, and A hot water supply circulation circuit is formed by returning from the hot water supply heat exchanger to the utilization side heat exchanger and then returning to the latent heat recovery heat exchanger via a circulation pump. The hot water supply circuit is used, or the hot water supply circulation circuit Or a hot water supply and heating device that can select whether to use a hot water supply circuit and a hot water supply circulation circuit at the same time,
The burner is a first burner that performs combustion within a predetermined rated capacity range when using a hot water supply circuit, and a second burner that performs combustion within a predetermined rated capacity range when using a hot water circulation circuit. Configure
When there is a load request exceeding the rated capacity during operation of the first burner or the second burner, a special operation mode is set to permit the operation of the second burner or the first burner with a predetermined period as an upper limit,
The hot water supply operation using the first burner and the hot water supply circulation operation using the second burner have predetermined priorities,
A hot water supply and heating device that releases the special operation mode and returns to the normal operation mode when the operation side with the higher priority starts operation while the operation side with the lower priority is operating in the special operation mode. Use as a heat exchanger for heating that supplies the amount of heat to a heating circuit that has a heating device that performs heating, bathroom drying, etc. The hot water supply and heating device according to claim 1, wherein the hot water supply and heating device can be made. As a use side heat exchanger, it can be used as a heat exchanger for baths that supplies heat to the bath circuit that retreats the bath, and can select either hot water or bath reheating alone or simultaneous use of hot water and bath reheating The hot water supply and heating device according to claim 1, which is configured as described above. Heating heat exchanger for supplying heat to a heating circuit having a heating device that performs heating, bathroom 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 and heating device according to claim 1, wherein the 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. The hot water supply / heating device according to 4. The heat exchanger for latent heat recovery has a stainless steel heat receiving pipe arranged side by side through a plurality of stainless steel plate fins, and a copper water pipe arranged in the heat receiving pipe. A water inlet header that collects the water inlets of the water pipes to form a single water inlet route, and a water outlet that gathers the water outlets of the water pipes to provide one water outlet header, thereby supplying water supplied from the water supply channel to a plurality of water pipes. The hot water supply and heating device according to any one of claims 1 to 5, wherein the hot water supply / heater is supplied to a heat exchanger for hot water supply via a path, and the latent heat of the combustion exhaust gas is recovered in the process. A bypass passage is provided for supplying water supplied from the water supply passage to the outlet hot water passage bypassing the latent heat recovery heat exchanger and the hot water supply heat exchanger, and the bypass passage draws water from a water supply passage upstream of the hot water supply circulation circuit. The hot water supply and heating device according to any one of claims 1 to 6, wherein the hot water is supplied and mixed with high-temperature water heated by a heat exchanger for hot water supply to supply desired hot water from a hot water outlet. A hot water supply circuit is provided for supplying hot water supplied from the hot water outlet to the bath circuit on the secondary side of the use side heat exchanger, and the hot water supply circuit supplies hot water mixed from the hot water outlet downstream of the bypass circuit. The hot water supply / room heating device according to any one of claims 1 to 7, wherein:

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