JP3931918B2 - Gas hot water heater - Google Patents

Description

  The present invention provides a hot water supply operation for supplying hot water to a kitchen, a washroom, a currant, a shower, etc., a heating operation for supplying hot water to a heating terminal such as a bathroom heating dryer, hot water air conditioner, floor heating hot water mat, etc. In a gas water heater / heater that performs bath operation to refill the set amount of hot water and set temperature and bath water, in a device configuration having a heat exchanger in which a hot water supply water pipe and a heating water pipe are arranged in one can The present invention relates to a technology that provides improved thermal efficiency during a bath chasing operation, and improved usability during simultaneous operation of a heating bath in which heating operation and bath chasing operation are performed simultaneously.

  Conventionally, the heat exchanger part of a gas hot water heater in which two water pipes of a hot water supply circuit water pipe and a heating circuit water pipe are disposed in a single can of this type is overheated in the other pipe that is not operated during each hot water supply or heating operation. In order to prevent this, the heat exchanger fin shape and the combustion system are devised (for example, refer to Patent Document 1).

  FIG. 17 shows a gas hot water supply system that can operate hot water supply, heating, and three water pipes of a bath in a heat exchanger configuration in which two water pipes of a hot water supply circuit water pipe and a heating circuit water pipe are arranged in one can devised as described above. The example of the conventional structure of a heater is shown.

  In FIG. 17, a heat exchanger 1 in which two water tubes of a hot water supply circuit water tube and a heating circuit water tube are arranged in one can, a combustion burner 2 for burning fuel gas, and a fuel gas supply unit for supplying fuel gas to the combustion burner 2 3, a combustion fan 4 that sends combustion air into the combustion burner 2, a bath warm water circulation pump 69 that conveys the bath water into the bath circuit, a bath return passage 55 through which the bath return warm water from the bathtub 67 flows, The bath forward flow path 56 through which the bath warm water from the equipment to the bathtub 67 flows, the heating return flow path 36 through which the heating return warm water from each heating terminal flows, and the high temperature side terminal represented by the equipment from the bathroom heating dryer A heating high-temperature forward flow path 33 through which high-temperature hot-warming water is heated, a heating low-temperature forward flow path 32 through which heating low-temperature warm water flows from equipment to a low-temperature side terminal represented by a floor heating hot water mat, and an appropriate amount of heating. To secure hot water A hot water tank 31, a heating passage circulating passage 39 through which heating hot water to be circulated only in the equipment flows, a heating bath heat exchange section 60 for exchanging heat between the heating hot water and the bath return hot water, and the heating outgoing flow passage And a flow path opening and closing valve 58 for opening and closing the bath heating flow path 59, and various operations. It is comprised from the control means 8 which controls.

  In the following, using hot water supply alone operation, heating single operation, pouring operation for supplying the amount of hot water in the bathtub, bath reheating independent operation, and heating bath simultaneous operation of heating operation and bath renewal operation using FIG. 17 Each operation will be described.

  First, in the case of a single hot water supply operation, when the user opens the hot water tap, the incoming water flow rate detecting means 27 detects the flow of the supplied water, and the control means 8 detects the temperature detected by the hot water supply heat exchange outlet thermistor 25 at a predetermined temperature. The combustion amount is adjusted while detecting the incoming water temperature with the incoming water thermistor 24 and the incoming water flow rate with the incoming water flow rate detecting means 27 so that the temperature (for example, 55 ° C.) is reached. Here, as the incoming water flow rate detection means 27, for example, an impeller type rotating body provided in the water passage of the incoming water flow rate detection means 27 rotates according to the incoming water flow rate, and the control means 8 detects the rotation speed pulse signal. A configuration for detecting the incoming water flow rate is conceivable. Combustion amount adjustment is performed by the fuel gas supply unit 3.

The fuel gas supply unit 3 opens and closes a gas proportional control valve 5 that adjusts the fuel gas supply amount according to the valve opening degree, and the fuel gas supply to each of the parts a, i, c, e, and o of the combustion burner 2. There are gas flow path opening / closing valves 6A, 6B, 6C, 6D, and the combustion amount is adjusted by adjusting the opening of the gas proportional control valve 5 and opening / closing the gas flow path opening / closing valves 6A, 6B, 6C, 6D. The fuel gas supplied from the fuel gas supply unit 3 is burned by the combustion burner 2 with the combustion air sent by the combustion fan 4. A high pressure discharge type igniter is provided in the portion of the combustion burner 2 at the time of ignition, and the control means 8 causes the igniter to spark discharge to start combustion at the time of ignition.

  Hot water that has been heat-exchanged to a predetermined temperature (for example, 55 ° C.) in the heat exchanger 1 flows through the hot water flow path 22 and is mixed with supply water that flows through the hot water supply bypass flow path 23. In the hot water supply bypass channel 23, a hot water supply bypass control valve 29 capable of opening and closing the channel diameter in stages is provided. Here, the hot water supply bypass control valve 29 may be configured such that the stepping motor is driven by the pulse opening / closing signal from the control means 8 to adjust the valve opening. When a user inputs a set hot water supply temperature (for example, 42 ° C.) with an external input means 9 such as a device remote controller, the hot water thermistor in which hot water flowing through the hot water flow path 22 and supply water flowing through the hot water supply bypass flow path 23 are mixed. The control means 8 performs control to adjust the valve opening degree of the hot water supply bypass control valve 29 so that the hot water temperature detected at 26 becomes the set hot water supply temperature (for example, 42 ° C.).

  When the amount of supplied water is large (for example, the amount of supplied water detected by the incoming water flow rate detection means 27 is 24 L / min or more), or when the incoming water temperature detected by the incoming water thermistor 24 is low and exceeds the combustion capacity of the gas water heater. First, the control means 8 controls the valve opening degree of the water amount control valve 28 in the closing direction so as to be within the combustion capacity range, thereby reducing the amount of supplied water. As the water amount control valve 28, for example, a configuration in which the valve opening degree is adjusted in accordance with a pulse opening / closing signal from the control means 8 similar to the hot water supply bypass control valve 29 can be considered.

  Next, in the case of heating independent operation, when the user inputs the heating operation start to the control means 8 by the external input means 9 such as a remote controller of the heating terminal or the equipment remote controller, the control means 8 is connected to the heating hot water circulation pump. 37 is driven to convey the heated hot water into the heating circuit. Then, similarly to the case of the hot water supply single operation, the control means 8 causes the high pressure discharge type igniter provided at the portion of the combustion burner 2 to spark discharge to start combustion. The combustion part of the combustion burner 2 in the case of heating independent operation is the part of (e) and (e) corresponding to the position of the heating circuit water pipe in the heat exchanger 1. Therefore, the combustion amount adjustment at the time of heating independent operation is performed by adjusting the opening degree of the gas proportional control valve 5 and opening and closing the gas flow path opening / closing valve 6D.

  In the heating operation of the gas hot water heater, it is usually possible to supply heating hot water having a plurality of temperatures according to the application to each heating terminal. In FIG. 17, a heating high-temperature forward flow path 33 for supplying heating hot water to a high-temperature terminal typified by a bathroom heating dryer, and a heating low-temperature forward flow for supplying heating hot water to a low-temperature terminal typified by a floor heating hot water mat. A configuration with a path 32 is shown. Gas water heaters can be operated with high-temperature single operation that supplies hot water to high-temperature terminals, low-temperature single operation that supplies hot water to low-temperature terminals, and high-temperature and low-temperature simultaneous operations that operate the high-temperature side and low-temperature side simultaneously. It can be performed.

  At the time of high-temperature independent operation, the heating hot water leaving the heat exchanger 1 flows as it is through the heating high-temperature forward flow path 33 and is supplied to the high-temperature terminal. Since the high-temperature terminal normally requires a heating hot water temperature of about 80 ° C., the control means 8 performs control to adjust the combustion amount so that the heating hot water temperature detected by the heating heat exchange outlet thermistor 38 becomes 80 ° C., for example.

At the time of low temperature independent operation, the heating return hot water flowing through the heating return passage 36 that has radiated heat at each heating terminal and the temperature decreased, and the heating bypass passage 35 provided with the check valve 34 are heated by the heat exchanger 1. The low temperature hot water mixed with the heating hot water leaving the heat exchanger 1 flows through the heating low temperature forward flow path 32 and is supplied to the low temperature terminal. During the low temperature single operation, the control means 8 adjusts the combustion amount so that the heating hot water temperature detected by the heating heat exchange outlet thermistor 38 becomes a predetermined temperature (for example, 70 ° C.).
The heating bypass passage 35 has a temperature required for the low-temperature terminal (for example, the low-temperature warm water temperature after mixing the heating-return hot water, which has radiated heat at each heating terminal and the temperature is reduced), and the heating hot water heated by the heat exchanger 1 (for example, The flow path is designed to be about 60 ° C.

  Since the operation on the high temperature terminal side is prioritized during the high temperature and low temperature simultaneous operation, the control means 8 has a heating hot water temperature detected by the heating heat exchange outlet thermistor 38 of, for example, 80 ° C. as in the high temperature single operation. The combustion amount control is performed so that Therefore, the low-temperature warm water temperature on the low-temperature terminal side has a desired value depending on the values of the low-temperature warm water flow rate and the heating return warm water temperature.

  By the way, in the heating circuit of the gas hot water heater, there is provided an in-heater circulation passage 39 for circulating the heating warm water only in the gas hot water heater. The purpose is from the beginning of the heating operation until the warm water flow opening / closing valve that supplies the heating warm water to each heating terminal is “open”, and the heating warm water is actually supplied to each heating terminal. Because it is necessary to circulate the heating / warming water only in the machine within time (for example, about 1 to 2 minutes), and to circulate the heating / warming water in order to prevent the heating circuit in the equipment from freezing in the severe winter season It is. Here, as the normal hot water flow path opening / closing valve, a configuration of a thermally operated valve in which the opening / closing valve is “open” when the electric heater is heated is used. Heating hot water flowing through the circulation channel 39 in the heater is not supplied to the heating terminal, so if the flow rate of heating warm water flowing through the circulation channel 39 in the heater is too large, the heating hot water is conveyed to each heating terminal of the gas hot water heater. The ability is impaired. Accordingly, the circulation path 39 in the heater is designed to have a minimum flow rate (for example, about 1 L / min) that does not impair the heating / warming water transfer capability of the gas hot water heater to each heating terminal. ing.

  Next, a pouring operation for supplying hot water in the bathtub 67 will be described. In FIG. 17, the pouring operation is performed by supplying hot water from a pouring flow path 68 branched from the hot water supply side of the hot water supply circuit and connected to the bath circuit. The pouring flow path 68 is provided with a pouring electromagnetic valve 53 that opens and closes the pouring flow path 68 and a check valve 54 that prevents reverse flow of bath water from the bath circuit side to the hot water supply circuit side. When the user sets the hot water temperature and quantity with the external input means 9 and inputs the start of pouring operation, the control means 8 opens the pouring solenoid valve 53 and starts the pouring operation.

  Here, regarding the amount of pouring, the water level type having a water level sensor for detecting the water pressure corresponding to the water level of the bathtub water provided in the bath circuit, the incoming water flow rate detecting means 27 for detecting the amount of supplied water, the pouring channel 68, a water amount formula that performs pouring with the integrated water amount detected by the pouring flow rate detecting means 52 that detects the pouring flow rate can be considered. Here, the latter water amount formula will be described. Similarly to the hot water supply operation, the control means 8 adjusts the combustion amount and controls the hot water supply bypass control valve 29 so that the hot water temperature detected by the hot water thermistor 26 becomes the set pouring temperature (for example, 42 ° C.) input by the user. Opening control is performed. Hot water at the set pouring temperature flows through the pouring channel 68 and is poured from both the bath return channel 55 and the bath going channel 56 into the bathtub. For example, when the integrated water volume of the supplied water volume detected by the incoming water flow rate detection means 27 reaches the set hot water volume (for example, 180 L), the control means 8 sets the hot water solenoid valve 53 to “closed” and stops the combustion to end the hot water pouring operation. .

Next, in the case of the bath reheating independent operation, when the user sets the hot water temperature (for example, 42 ° C.) with the external input means 9 and inputs the start of bath reheating, the control means 8 is in the high temperature independent operation during the heating independent operation. In the same manner as above, the flow path opening / closing valve 58 is set to “open”, and the bath hot water circulation pump 69 is driven to circulate the bath water in the bath circuit. Here, as the flow path opening / closing valve 58, for example, a configuration of a thermally operated valve that opens and closes when the electric heater is heated, similar to the hot water flow path opening / closing valve of the heating terminal, can be considered. When the passage open / close valve 58 is “open” and the heating hot water exiting the heat exchanger 1 flows into the bath heating flow channel 59, the heating warm water flowing through the bath heating flow channel 59 in the heating bath heat exchange section 60 Then, heat exchange is performed with the hot water returning from the bath flowing through the bath circuit, and the bath water is heated. Here, as the heating / bath heat exchanging unit 60, for example, a configuration in which a bath heating channel 59 and a bath circuit have a double tube structure is conceivable. When the bath water temperature detected by the bath return thermistor 55 reaches the hot water temperature set by the user (for example, 42 ° C.), the control means 8 stops the heating operation, sets the flow path opening / closing valve 58 to “closed”, and the bath The hot water circulation pump 69 is stopped and the chasing operation is finished.

Lastly, in the case of simultaneous heating and bathing operation of heating operation and bath reheating operation, it is necessary to heat the return water with heating warm water, so even if the operation request on the heating side is low temperature operation, the heating heat exchange outlet thermistor Combustion amount control is performed so that the heating hot water temperature detected at 38 becomes 80 ° C., for example. Therefore, the low temperature warm water temperature on the low temperature terminal side is the expected value. Further, the operation of the bath chasing operation is the same as that of the bath chasing single operation.
Japanese Patent Laid-Open No. 9-243166

  However, in the conventional configuration, in the case of the bath reheating operation, the hot water returning from the bath is not directly heated by the combustion burner 2, but the hot water returning from the bath is heated by the heated hot water heated directly by the heat exchanger 1. Since it is heated indirectly by the heat exchanging unit 60, there is a problem that the thermal efficiency of bathing is lower (for example, 70% to 75%) than when heated directly (for example, 80% to 85%). Was.

  In addition, in the case of the bath chasing operation, it is necessary to transport the heating / warming water in order to heat the bath return hot water in the heating bath heat exchanging unit 60 even if the heating operation is not performed. Therefore, the heating / warm water circulation pump 37 must also be driven, and there is a problem that the power consumption increases accordingly. Further, in the case of the heating bath simultaneous operation of the heating operation and the bath chasing operation, the heating / warming water conveyance flow rate on the heating operation side is equal to the amount of heating / warming water used by the heating / bath heat exchanging unit 60 for heating the bath return warm water. There was also a problem that it was reduced and accompanied by a decrease in heating capacity.

  The gas hot water heater of the present invention has a configuration in which a flow path switching means is provided between a heating circuit or a bath circuit for a heating circuit water pipe in a heat exchanger that is directly heated by a combustion burner. During operation, the heating circuit water pipe in the heat exchanger and the bath circuit are connected so that the bath return hot water can be directly heated in the heat exchanger by the combustion burner, so that the thermal efficiency at the time of the bath reheating operation can be improved. In addition, it is not necessary to drive both the heating hot water circulation pump and the hot water circulation pump of the bath hot water circulation pump as in the conventional case, so that the power consumption can be reduced as compared with the conventional case. . In addition, during simultaneous heating and bathing operation, where heating operation and bathing operation are performed at the same time, it is possible to perform optimal heat exchange distribution to the heating terminal side and heating bath heat exchange side according to the user's application, improving the usability. Can be planned.

According to a first aspect of the present invention, there is provided a single heat exchanger in which a heating circuit water pipe through which hot water used for heating and bath flows and a hot water supply circuit water pipe through which hot water used for hot water supply is disposed, and a single heat exchanger for heating the heat exchanger. A combustion burner, a fuel gas supply unit for supplying fuel gas to the combustion burner, a single combustion fan for sending combustion air to the combustion burner, a bath return flow path serving as a hot water transport path, and A bath-out channel, a bath-warm water circulating pump that transports hot bath water through the transport path, a heating return channel and a heating-out channel that serve as a transport path for heating hot water, and heating hot water through the transport path A heating / warming water circulation pump to be transported, a heating / warming water tank for securing an appropriate amount of heating / warming water, a circulation passage in the heating device for bypassing the heating / warming water to the inside of the device, and the bath conveyance path or the heating with respect to the heating circuit water pipe A return-side flow path switching means and a forward-side flow path switching means for switching the flow path between the heating path, a heating / warming water tank section closed flow path for flowing heating return warm water without passing through the heating / warming water tank, Heating / warming water tank section inflow side flow switching means for switching the flow path between the portion that flows into the heating / warming water tank in the heating return flow path and the heating / warming water tank section closed flow path; Heating / warming water tank section outflow side flow path switching means for switching the flow path between a portion flowing out of the heating / warming water tank and the heating / warming water tank section closed flow path, and the heating return warm water provided in the heating return flow path A heating return thermistor for detecting the temperature of hot water flowing through the flow path, and a bath circuit side pouring flow path through which hot water for pouring from the hot water supply circuit side to the bath circuit side is provided with a check valve and a check function In addition, a flow path opening / closing valve and a check function are provided to warm the A heating circuit side pouring flow path through which hot water for pouring hot water to the circuit side flows, and a control means, and by switching the transport path by the return side flow path switching means and the forward side flow path switching means, Enables hot water supply operation, heating operation, and bath operation with a single heat exchanger, and allows you to select whether to perform a bath reheating operation with a heating circuit or a bath reheating operation with a bath circuit It is characterized by having a function, and in the case of single operation after bathing, the hot water returning from the bath flows to the heating circuit water pipe in the heat exchanger so that it can be directly heated, improving the thermal efficiency during bathing operation. Can be achieved. In addition, when the bath is chasing alone, the hot water circulation pump to be driven may be either the heating hot water circulation pump or the bath hot water circulation pump, so that power consumption can be reduced.

  According to a second aspect of the present invention, there is provided a single heat exchanger in which a heating circuit water pipe through which hot water used for heating and bath flows and a hot water circuit water pipe through which hot water used for hot water supply is disposed, and a single heat exchanger for heating the heat exchanger. A combustion burner, a fuel gas supply unit for supplying fuel gas to the combustion burner, a single combustion fan for sending combustion air to the combustion burner, a bath return flow path serving as a hot water transport path, and A bath-out channel, a bath-warm water circulating pump that transports hot bath water through the transport path, a heating return channel and a heating-out channel that serve as a transport path for heating hot water, and heating hot water through the transport path A heating / warming water circulation pump to be transported, a heating / warming water tank for securing an appropriate amount of heating / warming water, a circulation passage in the heating device for bypassing the heating / warming water to the inside of the device, and the bath conveyance path or the heating with respect to the heating circuit water pipe A return-side flow path switching means and a forward-side flow path switching means for switching the flow path between the heating path, a heating bath heat exchange section for performing heat exchange between the heating hot water and the bath warm water, and a heating forward flow path A bath heating channel that branches from the heating bath heat exchanger, a channel opening / closing valve that opens and closes the bath heating channel, a bath return channel, and a bath forward channel Heating bath heat exchanging part bath channel flowing through the heating bath heat exchanging part, channel opening / closing valve for opening and closing the heating bath heat exchanging part bath channel, heating return without passing through the heating hot water tank Heating / warming water tank section closed flow path for flowing hot water, heating / warming water tank section inflow side for switching the flow path between the heating return water flow path to the heating / warming water tank section and the heating / warming water tank section closed flow path A flow path switching means, and a portion that flows out of the heating hot water tank in the heating return flow path; Heating / warming water tank section outflow side flow path switching means for switching the flow path between the heating / warming water tank section closed flow path and the temperature of hot water flowing in the heating return warm water flow path provided in the heating return flow path A heating return thermistor, a flow path opening / closing valve and a check function, and a hot water flow path for hot water flowing from the hot water supply circuit side to the bath circuit side, and a check valve and a check valve A heating circuit side pouring channel through which hot water for pouring hot water from the hot water supply circuit side to the heating circuit side and a control unit are provided, and the return side channel switching unit and the forward side channel switching unit By switching the transport path, the single heat exchanger enables hot water supply, heating, single operation of the bath, and simultaneous operation of the heating / bath. Machine that can choose whether to run the bath in In order to be able to directly heat the bath return hot water by flowing it into the heating circuit water pipe in the heat exchanger, the heat efficiency during the bath chasing operation is improved. Can be achieved. In addition, when the bath is chasing alone, the hot water circulation pump to be driven may be either the heating hot water circulation pump or the bath hot water circulation pump, so that power consumption can be reduced. Further, in the simultaneous operation of the heating bath, the bath return hot water is heated by the heating / warming water in the heating bath heat exchanging section, so that the simultaneous operation of the heating bath can be realized and the convenience of use of the device can be improved.

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

  The same functions and parts as those of the conventional example are denoted by the same reference numerals, and detailed description thereof is omitted.

(Embodiment 1)
FIG. 1 is a configuration diagram of a gas hot-water heater in the first embodiment of the present invention.

  In FIG. 1, a single heat in which a heating circuit water pipe 13 through which heated hot water flows, a hot water supply circuit water pipe 12 for heating hot water supply water, and a double water pipe of the heating circuit water pipe 13 are arranged in one can. Exchanger 1, single combustion burner 2 for burning fuel gas, fuel gas supply unit 3 having a single gas proportional control valve 5 for adjusting the supply amount of fuel gas, and combustion air are fed A single combustion fan 4, a bath warm water circulation pump 69 that circulates bathtub water in the bathtub 67 in the bath circuit, a bath return passage 55 through which bath return hot water from the bathtub 67 to the device flows, and a bath 67 from the device A bath-out passage 56 through which the bath-warming water flows, a heating / warming water circulation pump 37 that circulates the heating / warming water in the heating circuit, a heating return passage 36 through which heating / warming water from each heating terminal to the device flows, Heating from equipment to each heating terminal As a heating forward flow path through which hot water flows, a heating high temperature forward flow path 33 through which heating high temperature warm water flows to a high temperature terminal represented by a bathroom heating dryer and a low temperature side terminal represented by a floor heating hot water mat Heating low-temperature flow path 32 through which the heating low-temperature warm water flows, a heating / warming water tank 31 for securing an appropriate amount of heating / warming water in the device, and a circulation path in the heating device for circulating the heating warm-water only in the machine 39, return side channel switching means 61 for switching the channel between the heating circuit water tube 13 and the bath return channel 55 or the heating return channel 36, the heating circuit water tube 13 and the bath forward flow As the passage 56 or the heating forward passage, in particular, the forward passage switching means 62 for switching the passage between the heating high-temperature forward passage 33 and the heating circuit water pipe 13 side or the bath return passage 55 side Hot water reverse flow to the heating return flow path 36 side A check function 48 for preventing, and a control means 8 for controlling the various operations.

  Hereinafter, with reference to FIG. 1, the gas hot water heater according to the first embodiment of the present invention is operated independently, the pouring operation for supplying hot water in the bathtub, the bath reheating operation, and the heating operation Each operation at the time of simultaneous operation of the heating bath in which the bath chasing operation is performed simultaneously will be described.

  In addition, about the operation | movement at the time of hot water supply independent operation, it is the same as that of the prior art example shown in FIG. 17, and description is abbreviate | omitted.

  First, the operation at the time of heating independent operation will be described. In addition, as described in the above-described conventional example, at the time of heating independent operation, the high temperature independent operation for supplying heating warm water to the high temperature terminal, the low temperature independent operation for supplying heating warm water to the low temperature terminal, and the high temperature side and the low temperature side are performed. There are simultaneous high-temperature and low-temperature operations that operate at the same time. In the following description, the description will be made by representing the case of the high temperature single operation during the single heating operation.

When the user inputs the heating operation start by the external input means 9 such as the remote controller of the heating terminal or the equipment remote controller and the heating operation start is input to the control means 8, the control means 8 returns the return side flow path switching means. 61 and the forward flow path switching means 62 are driven, the heating circuit water pipe 13 and the heating return flow path 36 are connected, and the flow path switching between the heating circuit water pipe 13 and the heating high temperature forward flow path 33 is performed. Here, as the return side flow path switching means 61 and the forward side flow path switching means 62, for example, a configuration of a motor-driven three-way valve in which the flow path switching is performed by driving the flow path switching valve body by a stepping motor can be considered. . Usually, it takes a certain time (for example, about 10 seconds) until the valve body position of the motor-driven three-way valve moves and the flow path is completely switched. Therefore, a check function 48 for preventing a backflow is provided particularly on the return side flow path switching means 61 side so that the hot water in the flow path does not flow back during the movement of the valve body. Here, as the check function 48, for example, a configuration in which the check valve body is “opened” when a fluid force equal to or greater than the spring force of the spring provided in the check valve “open” direction is applied.

  FIG. 2 shows the flow of the heated hot water when the return-side flow path switching means 61 and the forward-side flow path switching means 62 are driven in this way to switch the flow path during the heating-only operation. In FIG. 2, the return-side flow path switching means 61 and the forward-side flow path switching means 62 are represented by triangular schematic shapes, and the motor-driven three-way valve is used for each flow path switching means. A typical valve body configuration is also shown. Here, in the three-way valve of each flow path switching means shown by three triangular schematic shapes, the flow paths of the parts represented by two white triangles are “open” with each other, and another black triangle This indicates that the flow path of the portion expressed by is “closed”.

  When it is determined that the flow path switching by driving the return-side flow path switching means 61 and the forward-side flow path switching means 62 is completed, the control means 8 drives the heating / warming water circulation pump 37 to indicate the heating / warming water as indicated by an arrow in FIG. To be conveyed. Here, the judgment that the flow path switching by each flow path switching means is completed is, for example, if the time required for moving the valve body of the motor-driven three-way valve is 10 seconds, the control means 8 starts driving the valve body. Then, it may be assumed that 20 seconds have passed. After switching the flow path between the return-side flow path switching means 61 and the forward-side flow path switching means 62 in this way, the heating heat exchange outlet thermistor 38 at the time of high-temperature single operation as in the case of the conventional example. Control is performed to adjust the combustion amount by adjusting the opening of the gas proportional control valve 5 and opening / closing of the gas flow path opening / closing valve 6D so that the detected temperature of the heated hot water becomes 80 ° C.

  Here, if one or both of the two flow path switching means are out of order and the flow path switching is not performed correctly, heating is performed by the combustion burner 2 without fluid movement inside the heating circuit water pipe 13. When the internal water of the heating circuit water pipe 13 is overheated and the temperature detected by the heating heat exchange outlet thermistor 38 becomes equal to or higher than a predetermined temperature (for example, 90 ° C.), an error is detected and combustion is stopped. It is possible to make the user recognize by indicating the display portion 9.

  Next, the operation | movement at the time of the pouring operation which supplies the amount of hot water in a bathtub is demonstrated. The operation during the pouring operation may be performed when the pouring operation is performed alone or when the pouring operation is performed while performing the heating operation. The channel switching method of the channel switching means 62 is different.

  FIG. 3 shows the flow path switching positions of the return side flow path switching means 61 and the forward side flow path switching means 62 when the pouring operation is performed independently, and the flow of the pouring water at that time. Hereinafter, the operation when the pouring operation is performed independently will be described with reference to FIG. Here, similarly to the case described in the above-mentioned conventional example, the case of a water amount type will be described as the pouring function of the bath.

When the user inputs the pouring temperature (for example, 42 ° C.) and the pouring amount (for example, 180 L) by the external input means 9 such as a device remote controller and inputs the pouring operation start, the control means 8 is in that stage. Judge whether the heating operation is performed or not. And when heating operation is not performed, the control means 8 drives the return side flow path switching means 61 and the forward side flow path switching means 62, connects the heating circuit water pipe 13 and the bath return flow path 55, and the heating circuit water pipe 13 And switching the flow path connecting the bath flow path 56. Simultaneously with this flow path switching operation, the control means 8 opens the pouring electromagnetic valve 53 that opens and closes the pouring flow path 68 branched from the hot water supply side of the hot water supply circuit and connected to the bath circuit. The hot water supply operation similar to the case is performed, hot water having a pouring temperature (for example, 42 ° C.) set by the user flows from the pouring channel 68 to the bath circuit, and the pouring operation is started. Here, in the case of the pouring operation, the bath return channel 65 remains in the bathtub even if the channel switching of the two channel switching units of the return side channel switching unit 61 and the forward side channel switching unit 62 is not completely completed. Since it is connected to 67 in an air-released state, at least pouring from the bath return channel 65 to the bathtub 67 is performed without any problem. When the channel switching by the two channel switching means is completely completed, the bath return channel 6
The hot water is poured into the bathtub 67 from both the 5 side and the bath going-out flow path 64 side. Then, for example, when the integrated water volume of the supplied water volume detected by the incoming water flow rate detection means 27 reaches the set hot water volume (for example, 180 L), the control means 8 sets the hot water solenoid valve 53 to “closed” and stops the combustion to end the hot water operation.

  In addition, when the pouring operation is performed independently, the input of the heating operation start is made to the control means 8, and when it is assumed that the pouring operation and the heating operation are performed simultaneously, for example, the following equipment Driving patterns can be considered.

  First, the pouring operation is prioritized to wait for the heating operation, and when the pouring operation is completed, the control means 8 drives the return side flow path switching means 61 and the forward side flow path switching means 62 to perform the heating independent operation. As described in the description, it is conceivable that the heating operation is started by switching the flow path connecting the heating circuit water pipe 13 and the heating circuit.

  Alternatively, while the pouring operation is being performed, the control means 8 drives the return side flow path switching means 61 and the forward side flow path switching means 62 to switch the flow path connecting the heating circuit water pipe and the heating circuit, It is conceivable that the pouring operation and the heating operation are performed simultaneously. FIG. 4 shows the flow of pouring water and heating hot water when the heating operation is performed while performing the pouring operation in a state where the flow path connecting the heating circuit water pipe 13 and the heating circuit is switched. In this case, since the pouring operation can be performed only from one of the bath return passages 65, the pouring flow rate is reduced as compared with the case of pouring from both the bath return passage 65 and the bath forward passage 64. . Therefore, for example, the user can perform an input to prioritize the pouring operation with the external input means 9, and the pouring operation and the heating operation can be performed simultaneously with the parameter mode switching means in the control means 8 at the time of equipment installation. If it is possible to select whether to give priority to the pouring operation, the device operation pattern can be set according to the user's device usage.

  Alternatively, if the progress state of the pouring operation is a predetermined stage (for example, the integrated pouring amount at that time is 70% or more of the set pouring amount value (for example, 180 L)), the control means 8 waits for the heating operation. The pouring operation is prioritized, and if the progress of the pouring operation has not reached a predetermined stage, the control means 8 drives the return side flow path switching means 61 and the forward side flow path switching means 62 to perform heating. The flow path connecting the circuit water pipe and the heating circuit is switched, and the pouring operation and the heating operation are performed simultaneously. Such a method is conceivable.

  In addition, when the pouring operation is input during the heating operation, for example, as described above, whether the pouring operation is given priority or the pouring operation is performed while performing the heating operation. What is necessary is just to make it able to determine according to a user's apparatus use convenience.

Next, the operation at the time of bathing alone operation will be described. FIG. 5 shows the flow of hot bath water during a bath-only operation. When the user sets the hot water temperature (for example, 42 ° C.) with the external input means 9 and inputs the start of reheating, the control means 8 drives the return-side flow path switching means 61 and the forward-side flow path switching means 62, and the heating circuit The water pipe 13 and the bath return flow path 55 are connected, and the flow path switching between the heating circuit water pipe 13 and the bath forward flow path 56 is performed. After the control means 8 starts driving the return side flow path switching means 61 and the forward side flow path switching means 62, the control means 8 drives the bath hot water circulation pump 69 after a predetermined time (for example, 20 seconds). Here, the hot water circulating pump 69 is driven after a predetermined time (for example, 20 seconds) when the motor-driven three-way valve is applied to the two flow path switching means as described above. It is because it can be judged that it moved. By switching between the two flow path switching means, the heating circuit water pipe 13 and the bath circuit side are connected, the bath water is conveyed into the bath circuit by the bath hot water circulation pump 69, and the water flow detecting means 71 detects the water flow of the bath warm water. The control means 8 sparks a high-pressure discharge igniter provided at the o-portion of the combustion burner 2 to start combustion. Here, as the water flow detection means 71 provided in the bath circuit, for example, a configuration of a magnet-type butterfly-shaped switch is conceivable. A magnet having a certain weight is attached to the butterfly portion provided in the flow path, and when the water flow in the flow path exceeds a predetermined value (for example, 3 L / min), the butterfly section is pushed up, and the water flow detection means 71 When the detection part provided in the casing part detects the magnetic force of the magnet of the butterfly part, the electric circuit is conducted, and the water flow in the flow path can be detected. Further, when one or both of the two flow path switching means of the return side flow path switching means 61 and the forward side flow path switching means 62 are out of order and the flow path switching is not performed correctly, the bath hot water circulation pump 69 is used. However, since no water flow is generated in the bath circuit, the water flow detection means 71 does not operate. Therefore, if the structure of the water flow detection means 71 is utilized, the malfunction of the two flow path switching means can also be detected. The combustion part of the combustion burner 2 in the case of a single bath reheating operation is a part of A and E corresponding to the position of the heating circuit water pipe in the heat exchanger 1. The control means 8 is detected by the heating heat exchange outlet thermistor 38 while detecting the bath warm water temperature indicated by the heating heat exchange outlet thermistor 38 and the bath return hot water temperature which is the bath water temperature indicated by the bath return thermistor 57. The combustion amount is adjusted by adjusting the opening of the gas proportional control valve 5 and opening / closing the gas flow path opening / closing valve 6D so that the temperature becomes a predetermined value (for example, a set temperature (for example, 42 ° C.) + 5 ° C.). When the bath water temperature detected by the bath return thermistor 57 reaches the hot water temperature set by the user (for example, 42 ° C.), the control means 8 stops the combustion, stops the bath hot water circulation pump 69 and ends the reheating operation. To do.

  Next, the operation at the time of heating bath simultaneous operation in which heating operation and bath reheating operation are performed simultaneously will be described. In the gas hot water heater of this configuration shown in FIG. 1, the heating operation and the bath reheating operation cannot be performed completely simultaneously because there is only a single heating circuit water pipe 13. Therefore, for example, the following equipment operation pattern can be considered as a method of determining the priority order of the heating operation and the bath reheating operation.

  First, it is conceivable to prioritize one of the heating operation and the bath chasing operation and to wait for the other operation. For example, the user sets which operation is to be prioritized by the external input means 9, or has the parameter mode switching means or the like in the control means 8 at the time of installation of the device, which operation is prioritized. Can be selected, it is possible to set a device operation pattern according to the user's device usage.

  Alternatively, the bath driving operation is prioritized for the characteristics of the heating operation and the bath driving operation. In other words, the heating operation is usually monitored by the temperature at the heating terminal side, and the operation at the heating terminal side is turned on / off, but the normal bath reheating operation is performed once at a predetermined temperature ( When boiling up to 42 ° C., for example, the bath reheating operation is not performed unless the user again inputs the start of the bath reheating operation with the external input means 9. Therefore, for example, if an input for starting the heating operation is performed during the bath chasing operation, the heating operation is not started until the bath chasing operation is completed, and if an input for starting the bath chasing operation is performed during the heating operation, Once the heating terminal is in the state of heat dissipation “off”, the return side flow path switching valve 61 and the forward side flow path switching valve 62 are driven to switch the circuit to the heating circuit water pipe 13 and the bath circuit side to reheat the bath. Do not perform the heating operation again until is completed.

As described above, according to the configuration of the gas hot water heater in the first embodiment of the present invention shown in FIG. 1, the two of the return side channel switching unit 61 and the forward side channel switching unit 62 are provided during the bath reheating operation. The heating circuit water pipe 13 and the bath circuit are connected by the flow path switching means, and the bath water can be directly heated by the heat exchanger 1. Therefore, the heat loss is less than that of the indirect heating method in which the heating bath heat exchanging unit 60 performs heat exchange between the heating hot water and the bath returning hot water, which is described in the case of the single bathing operation of the conventional example. It is possible to improve the thermal efficiency at the time of reheating independent operation. In addition, as described in the above-described conventional example, it is not necessary to drive both the bath hot water circulation pump 69 and the heating hot water circulation pump 37, and only the bath hot water circulation pump 69 needs to be driven when the bath chasing operation is performed. Electric power can be reduced.

(Embodiment 2)
FIG. 6 is a configuration diagram of a gas hot water heater in the second embodiment of the present invention.

  In FIG. 6, the difference from FIG. 1 which shows the structure of the gas hot-water heater in the 1st Embodiment of this invention differs in the heating hot water and bath return hot water in the gas hot-water heater of the conventional structure shown in FIG. The function of the heating bath heat exchanging unit 60 for exchanging heat between the two is provided.

  Specifically, in FIG. 6, in addition to the configuration of FIG. 1, a heating bath heat exchanging unit 60 that performs heat exchange between the heating hot water and the bath return hot water, and a heating high temperature forward flow path 33 as a heating forward flow path in particular. A flow path opening / closing valve 58 that opens and closes the flow path of the bath heating flow path 59, and a flow path opening / closing valve 58 that opens and closes the flow path of the bath heating flow path. The flow of the heating bath heat exchanging portion bath passage 70 through which the bath returning hot water connected to the bath returning passage 55 and the bath outgoing passage 56 is heated by the heating bath heat exchanging portion 60 and the flow of the heating bath heat exchanging portion bath passage 70 It is comprised with the flow-path on-off valve 63 which opens and closes a path.

  Hereafter, the operation | movement at the time of the heating bath simultaneous operation which performs the heating operation and bath reheating operation of the gas hot-water supply heater in the 2nd Embodiment of this invention simultaneously is demonstrated, using FIG. In addition, each operation | movement at the time of the heating independent operation | movement at the time of the pouring operation which supplies the amount of hot water in a bathtub, and a bath reheating individual operation is the same as that of the case described in 1st Embodiment, and it abbreviate | omits.

  As a pattern for simultaneous operation of heating and bathing, input of starting bathing operation is performed when performing heating independent operation, or input of starting heating operation is performed when performing bathing independent operation There are two possible ways.

  First, a description will be given of a case where an input for starting a bath retreat operation is performed during a single heating operation and a simultaneous operation of the heating bath is performed. In this case, since the heating operation is performed, the return side channel switching unit 61 and the forward side channel switching unit 62 are configured to connect the heating circuit water pipe 13 and the heating circuit. Accordingly, the bath water cannot be led to the heating circuit water pipe 13 and directly heated by the heat exchanger 1, and the bath return hot water is heated by the heating bath heat exchanging unit 60. When the start of the bath reheating operation is input during the heating operation, the control means 8 causes the flow path opening / closing valve 58 provided in the bath heating flow path 59 and the flow provided in the heating bath heat exchange section bath flow path 70. The road opening / closing valve 63 is opened. Here, as a configuration of the flow path on / off valve 58 and the flow path on / off valve 63, for example, a configuration of a thermally operated valve in which the on / off valve is “open” when the electric heater described in the conventional example is heated can be considered. When the flow path opening / closing valve 58 and the flow path opening / closing valve 63 are “open”, the heating hot water flows from the heating high temperature forward flow path 33 to the bath heating flow path 59, and the heating bath heat exchange section bath flow path 70 receives The bath return hot water conveyed by the bath hot water circulation pump 69 flows, and heat exchange is performed from the high temperature side heating warm water to the low temperature side bath return hot water in the heating bath heat exchanging unit 60. When the bath return temperature, which is the bath water temperature detected by the bath return thermistor 57, reaches the hot water temperature set by the user (for example, 42 ° C.), the control means 8 stops the bath hot water circulation pump 69 to open and close the flow path. The valve 58 and the flow path opening / closing valve 63 are “closed”, and the bath chasing operation ends.

Next, a case will be described in which an input for starting a heating operation is performed during a bath chasing single operation and a simultaneous heating bath operation is performed. The operation at the time of bathing alone operation is as described in the above (Embodiment 1). In this case, since the bath chasing single operation is initially performed, the return side channel switching unit 61 and the forward side channel switching unit 62 are configured to connect the heating circuit water pipe 13 and the bath circuit side. . Further, the flow path opening / closing valve 63 is “closed”, and bath return hot water does not flow in the heating bath heat exchange section bath flow path 70. When the heating operation start is input in this state, the control means 8 drives the return side flow path switching means 61 and the forward side flow path switching means 62 to connect the heating circuit water pipe 13 to the heating circuit side, Control is performed so that the passage opening / closing valve 58 and the passage opening / closing valve 63 are opened. Heating of the bath return hot water is performed by the heating bath heat exchanging unit 60. When the bath return temperature, which is the bath water temperature detected by the bath return thermistor 57, reaches the hot water temperature set by the user (for example, 42 ° C.), the control means 8 stops the bath hot water circulation pump 69 to open and close the flow path. The valve 58 and the flow path opening / closing valve 63 are “closed”, and the bath chasing operation ends.

  Here, the input of the heating operation start is performed when the bath chasing single operation is performed, and the case where the heating bath simultaneous operation is performed is described in the case of the heating bath simultaneous operation of the first embodiment, for example. As described above, it is possible to give priority to the bath chasing operation side. In other words, heating the bath return warm water with the heat exchanger 1 can obtain higher thermal efficiency, so that the bath water is quickly boiled, so that the user gives priority to the bath reheating operation with the external input means 9. When the equipment is installed, the control means 8 can select the parameter mode switching means to give priority to the bath chasing operation, or the chasing operation can be performed at a predetermined stage (for example, the set boiling temperature from the initial bath temperature). If it is determined that it takes more time to switch the flow path, etc., the reheating operation is performed first, and the reheating operation is completed. Then, it is possible to perform device operations such as causing the heating operation to be performed.

  In addition, the configuration of the present invention is to operate hot water supply with a single can hot water supply side heat exchanger, perform heating operation with a single can heating side heat exchanger, and perform heating side heat exchange in the heating bath heat exchanger. The present invention can also be applied to a conventional gas hot water heater that reheats a bath by exchanging heat with hot and cold water heated by a heater. FIG. 18 shows a configuration of a gas hot water heater having such a configuration. 18 is different from FIG. 17 in that the hot water supply circuit water pipe 12 and the heating circuit water pipe 13 are disposed in a single can of the hot water supply side heat exchanger 81 and the heating side heat exchanger 82, respectively. Similarly to the configuration of FIG. 17, each of hot water supply single operation, heating single operation, pouring operation for supplying hot water in the bathtub, bath reheating independent operation, and heating bath simultaneous operation of heating operation and bath reheating operation You can drive. The operation of each operation is the same as that of the configuration of FIG. 17 described in the conventional example, and the details are omitted.

  FIG. 7 shows the configuration of the gas hot-water heater in the second embodiment of the present invention, in which the two-can heat exchanger shown in FIG. The block diagram at the time of applying to the gas hot-water supply heater of the conventional structure which can be shown is shown. The difference between the configuration shown in FIG. 7 and the configuration in FIG. 18 is that the return side channel switching means 61 that performs channel switching between the heating circuit water pipe 13 and the bath return channel 55 or the heating return channel 36, The present invention is provided with the forward flow path switching means 62 for switching the flow path between the heating circuit water pipe 13 and the bath forward flow path 56 or the heating high temperature forward flow path 33 as the heating forward flow path. According to this configuration, similarly to the configuration shown in FIG. 6, the bath water can be directly heated in the heating circuit water pipe 13 when the bath reheating operation is performed alone, and the return-side flow path switching means 61 and the outward flow are simultaneously operated during the heating bath simultaneous operation. By switching the path switching means 62, the heating circuit water pipe 13 and the heating circuit are connected, the heating hot water is directly heated by the heating-side heat exchanger 82, and the hot water returning from the heating is heated by the heating bath heat exchanging unit 60. Can be heated.

As described above, according to this configuration, when bathing alone is operated, the bath water can be directly heated in the heating circuit water pipe 13 as described in the first embodiment. By providing the heating bath heat exchanging unit 60 that exchanges heat between the heating warm water and the bath return warm water, it is possible to realize simultaneous heating bath operation, The user-friendliness can be improved as compared with the case of the first embodiment. In addition, as described in the above-described conventional example, it is not necessary to drive both the bath hot water circulation pump 69 and the heating hot water circulation pump 37, and only the bath hot water circulation pump 69 needs to be driven when the bath chasing operation is performed. Electric power can be reduced. Further, during the simultaneous operation of the heating bath, the bath return hot water is heated by the heating hot water in the heating bath heat exchanging unit 60, so that the simultaneous operation of the heating bath can be realized, and the gas hot water heating in the first embodiment is performed. It is possible to improve the user-friendliness over the machine.

(Embodiment 3)
FIG. 8 is a configuration diagram of a gas hot water heater in the third embodiment of the present invention. The gas hot water heater in the third embodiment of the present invention heats the bath return hot water with the heating hot water shown in FIG. 9 in the configuration of the gas hot water heater in the first embodiment of the present invention in FIG. The functional configuration of the heating bath heat exchanging unit 60 is a device configuration that can be added as necessary after the device is installed.

  In FIG. 8, the gas hot water heater according to the third embodiment of the present invention includes a heating bath heat exchange section bath channel bath return channel side connection port 72 </ b> A in the middle of the bath return channel 55 and the bath forward channel 56. The heating bath heat exchange section bath channel bath forward channel side connection port 73A, the heating heating channel in the middle of the heating return channel 36, and the heating return channel side connection port 45A. In the middle of the path 33, a bath heating channel heating forward channel side connection port 46A and closing plugs 74A, 74B, 74C, 74D for closing these four connection ports are configured. Although the gas hot water heater in the first embodiment of the present invention shown in FIG. 1 could not perform the simultaneous operation of the heating bath, the gas hot water heater in the third embodiment of the present invention It is possible to add a functional configuration of the heating bath heat exchange unit 60 shown in FIG. If the functional configuration of the heating bath heat exchanging unit 60 shown in FIG. 9 is added to the configuration of the present invention shown in FIG. 8, the equipment configuration of the gas hot water heater in the second embodiment of the present invention shown in FIG. It will be the same.

  When a contractor or the like adds the functional configuration of the heating / bath heat exchange unit 60, the four stopper plugs 74A, 74B, 74C, and 74D on the device side are removed, and the connection ports in FIGS. 8 and 9 are connected to each other. , Heating bath heat exchange section bath flow path bath return flow path side connection ports 72A and 72B, heating bath heat exchange section bath flow path bath forward connection ports 73A and 73B, bath heating flow path heating return flow path connection ports 45A and 45B The bath heating channel heating forward channel side connection ports 46A and 46B are connected. Further, in the control means 8, the bath return hot water is directly heated in the heating circuit water pipe 13 during the bath-only operation, and the return-side flow switching means 61 and the forward-side flow switching means 62 are switched during the simultaneous operation of the heating bath. The heating circuit water pipe 13 and the heating circuit are connected, the heating return hot water is directly heated in the heating circuit water pipe 13, and the bath return hot water is indirectly heated by the heating warm water heated by the heating bath heat exchanger 60. A means for switching to the method is provided in advance. When the functional configuration of the heating / bath heat exchanging unit 60 is added, the function of the heating / bath heat exchanging unit 60 can be used by switching the operation method using the parameter mode switching unit provided in the control unit 8. deep. When the functional configuration of the heating bath heat exchanging unit 60 shown in FIG. 9 is added to the configuration of the gas hot water heater of the present invention shown in FIG. 8, the gas hot water supply in the second embodiment of the present invention shown in FIG. Since the equipment configuration of the heater is the same, it is possible to operate in the same way, so when performing heating alone, pouring to supply the amount of hot water in the bathtub, bathing alone, and heating and bathing Detailed description of each operation at the time of simultaneous heating bath operation is omitted.

As described above, according to the present configuration, since the basic device configuration can directly heat the bath water in the heating circuit water pipe 13 as described in the first embodiment, it is possible to improve the thermal efficiency at the time of bathing alone operation. In addition, by adding a functional configuration of the heating bath heat exchanging unit 60 that performs heat exchange between the heating hot water and the bath return hot water after the installation of the device according to necessity, the second embodiment can be Since it can be made to be the same as the equipment configuration of the gas hot water heater and realize simultaneous operation of the heating bath, the equipment is more than the equipment configuration of the gas hot water heater of the first embodiment of the present invention. Usability can be improved. In addition, as described in the above-described conventional example, it is not necessary to drive both the bath hot water circulation pump 69 and the heating hot water circulation pump 37, and only the bath hot water circulation pump 69 needs to be driven when the bath chasing operation is performed. Electric power can be reduced.

(Embodiment 4)
FIG. 10 shows a configuration diagram of a gas hot water heater in the fourth embodiment of the present invention. In FIG. 10, the difference from FIG. 1 showing the configuration of the gas hot water heater in the first embodiment of the present invention is that the heating return hot water flows through the heating return passage 36 without passing through the heating hot water tank 31. Heating / warm water tank section closed flow path 103, heating / warming water tank section inflow side flow for switching the flow path between heating / warming water tank section closed flow path 103 and the portion that flows into heating / warm water tank 31 through heating return flow path 36 The path switching means 101 and the heating / warming water tank section outflow side flow path switching means 102 for switching the path between the portion of the heating return flow path 36 that flows out of the heating / warming water tank 31 and the heating / warming water tank section closed flow path 103. And a heating return thermistor 49 provided in the heating return flow path 36 for detecting the temperature of hot water flowing through the heating return flow path 36, a bath circuit side pouring electromagnetic valve 53A and a bath circuit side check valve 54A. Bath circuit provided In addition to the pouring flow path 68A, the heating circuit side pouring flow path 68B provided with the heating circuit side pouring electromagnetic valve 53B and the heating circuit side check valve 54B, and the reheating of the bath in the control means 8 by the heating circuit And a function capable of selecting a control method for performing an operation or a control method for performing a chasing operation of a bath in a bath circuit.

  A major feature of the gas hot water heater in the fourth embodiment of the present invention configured as described above is that it can perform a reheating operation of a bath using a heating circuit. The configuration of the gas hot water heater of the present invention capable of operating hot water supply, heating, and the three water pipes of a bath with a single heat exchanger in which a hot water supply water pipe and a heating water pipe are arranged in a single can. As a feature, it is possible to design a small equipment volume of the entire gas hot water heater by using a single heat exchanger. The hot water supply circuit heat pipe is heated by a conventional canned hot water supply side heat exchanger to perform hot water supply operation to supply hot water to a currant, shower, etc. It can be equivalent to a bath water heater capable of performing a reheating operation of a bath by heating a circuit water pipe and performing a pouring operation of supplying a constant amount of hot water to a bathtub using a hot water supply operation.

  Therefore, it is possible to re-install the gas hot-water heater of the present invention in a place where the conventional bath-water heater has been installed, and use the gas hot-water heater of the present invention as a heat source device that provides the function of the bath water heater. is there. The gas hot water heater in the fourth embodiment of the present invention focuses on the case where the gas hot water heater of the present invention is installed as a replacement for the bath water heater in this way, and retreats the bath in both the heating circuit and the bath circuit. An object of the present invention is to provide a gas hot water heater having a wider range of equipment installation by enabling operation. In addition, the gas hot water heater in the fourth embodiment of the present invention is installed as a replacement for a bath water heater, and is initially used as a function of the bath water heater, but it can improve the user's equipment usage afterwards. It is also possible to apply all the functions of the original gas hot water heater so that the heating operation can be performed.

  Hereafter, each operation | movement in the gas hot-water supply heater in the 4th Embodiment of this invention is demonstrated, using FIG.

First, the installation state when the bath circuit is installed so as to perform the reheating operation of the bath is exactly the same as the configuration of the gas hot water heater in the first embodiment of the present invention shown in FIG. In this case, when a heating terminal is installed and a heating operation function is added later, the heating / warming water tank section inflow side flow path switching means 101 and the heating / warming water tank section outflow side flow path switching means 102 are switched to The tank section closed flow path 103 is set to “closed” so that the heated hot water flows through the heated hot water tank 31. Here, as the configuration of the heating tank section inflow side flow path switching means 101 and the heating tank section outflow side flow path switching means 102, for example, the description of the configuration of the return side flow path switching means 61 and the forward side flow path switching means 62 is given. The configuration of the motor-driven three-way valve in which the flow path switching valve body is switched by the control signal from the control means 8 when the flow path switching valve body is driven by the stepping motor, and the heating operation function at or after the installation by the contractor A configuration of a manual switching three-way valve using a ball valve or the like that can manually switch the flow path when adding a valve is conceivable. The heating tank section inflow side flow path switching means 101 and the heating tank section outflow side flow path switching means 102 are considered to have the possibility of switching the flow path only at the time of installation of the equipment or after construction for which a heating operation function is added later. Therefore, it is considered that the configuration of the latter manual switching three-way valve is more appropriate in terms of simplifying the device configuration as the configuration of these two flow path switching means.

  By the way, generally the heating hot water tank 31 of the gas hot water heater is open to the atmosphere, and the amount of heating hot water in the heating hot water tank 31 decreases due to evaporation or the like over time. At that time, in order to replenish the reduced amount of heating hot water, a heating hot water tank 31 is provided with a heating hot water operation function for supplying heating hot water to the heating hot water tank 31. FIG. 19 shows an internal configuration of a general heating / warm water tank 31, and the heating replenishing water operation function will be described.

  In FIG. 19 and FIG. 17, the heating hot water tank 31 branches from the incoming water flow path 21 of the hot water supply flow path when the heating hot water amount decreases, and the heating hot water tank 31 for replenishing the heating hot water tank 31 with water is provided. Heating replenishment water solenoid valve 40 that opens and closes, tank full detection electrode 42 for detecting the full position of the heated hot water in the heated hot water tank 31, and the reduced position of the heated hot water in the heated hot water tank 31 The tank water reduction detection electrode 43 and a tank overflow channel 44 for discharging excess heating water to the outside of the heating water tank 31 when the heating water in the heating water tank 31 overflows are configured.

  Here, the heating replenishing water solenoid valve 40 has a configuration of a solenoid valve type on-off valve similar to the pouring solenoid valve 53. When the heated hot water in the heated hot water tank 31 decreases due to evaporation or the like, and becomes equal to or less than the tank low water detection electrode 43, the control means 8 opens the heating replenishing water electromagnetic valve 40, and the amount of heated hot water in the heated hot water tank 31 is reduced to the tank. Water is replenished from the water inlet channel 21 until the full water detection electrode 42 is reached. Here, as the tank full detection electrode 42 and the tank low water detection electrode 43, for example, a voltage existing in those electrode portions is applied, and when heating hot water is present, a potential difference occurs, and the presence or absence of the heating hot water in those electrode portions is determined. The system is able to detect. As described above, when the amount of heating hot water decreases, the heating replenishing water electromagnetic valve 40 is “open”, and the heating replenishing water operation for supplementing the reduced amount of heating hot water in the heating hot water tank 31 is performed.

  Regarding the heating replenishing water operation, the configuration of the heating circuit side pouring flow path 68B provided with the heating circuit side pouring electromagnetic valve 53B of the gas hot water heater in the fourth embodiment of the present invention shown in FIG. If it uses, it can serve as the function of the heating water replenishment flow path 41 provided with the heating replenishment water electromagnetic valve 40 in the previous term. That is, as described above, when the heating hot water amount in the heating hot water tank 31 becomes equal to or less than the tank water decrease detection electrode 43, the control means 8 opens the heating circuit side pouring electromagnetic valve 53B, and sets the heating water on the tank full detection electrode 42 or more. Water is replenished to the heating circuit until the heating hot water amount in the heating hot water tank 31 is reached.

  However, in order to perform the heating makeup water operation using the heating circuit side pouring flow path 68B provided with the heating circuit side pouring electromagnetic valve 53B, the gas hot water supply in the fourth embodiment of the present invention shown in FIG. This must be the case when the heating circuit of the heater is installed for heating operation. At this time, the heating / warming water tank section inflow side flow path switching means 101 and the heating / warming water tank section outflow side flow path switching means 102 set the heating / warming water tank section closed flow path to “closed” so that the heating / warming water flows into the heating / warming water tank 31. Set the device.

In addition, even during the hot water supply operation or the pouring operation, even if a command for the heating replenishment water operation is input from the tank water reduction detection electrode 43 to the control means 8, for example, the heating replenishment water until the hot water supply operation or the pouring operation is completed. The operation that keeps the operation waiting is performed. Further, during the heating replenishing water operation, the return-side flow path switching means 61 and the forward-side flow path switching means 62 need to connect the heating circuit water pipe 13 and the heating circuit. Even if a heating replenishing water operation command is input to the control means 8 from the detection electrode 43, an operation of waiting for the heating replenishing water operation until the bath reheating operation is completed is performed.

  When the bath circuit is installed so as to perform a reheating operation of the bath, each operation of the pouring operation to the bathtub, the reheating operation of the bath, or the heating operation that can be added later is described in the above (Embodiment 1). This is the same as described above, and details are omitted.

  Next, the operation at that time will be described for a case where the heater circuit is installed so as to perform a bath retreat operation. FIG. 11 shows a configuration diagram in a case where the heater circuit is installed so as to perform a bath chasing operation with a heating circuit. In FIG. 11, a bath return pipe 64 is connected to the heating high-temperature forward flow path 33, and a bath return pipe 65 is connected to the heating return flow path. Since the heating low-temperature forward flow path 32 is not used, the heating low-temperature forward flow path outlet is set to “closed” using, for example, a stopper plug. The heating / warming water tank section inflow side flow path switching means 101 and the heating / warming water tank section outflow side flow path switching means 102 return the bath to the heating / warming water tank 31 opened to the atmosphere by setting the heating / warming water tank section closed flow path 103 to “open”. The contractor, etc. should switch manually so that warm water does not flow. At this time, when the bath heating operation is performed by the heating circuit, the heating hot water tank 31 is set to “closed” and the heating circuit in the gas hot water heater is set to a closed loop because it is connected to the bathtub 67 opened to the atmosphere. is there. This is because a difference in height usually occurs between the water surface of the heating / warming water tank 31 and the bath water surface of the bathtub 67, and the water in either the heating / warm water tank 31 or the bathtub 67 falls off. Such a problem does not occur because the heating circuit in the case of the heating terminal is not open to the atmosphere. Then, the contractor or the like switches to the “control mode in which the bath reheating operation is performed in the heating circuit” provided in the control unit 8 at the time of installation of the device by the parameter mode switching unit or the like. When this mode switching is performed, for example, the control means 8 performs the flow path switching so that the return side flow path switching means 61 and the forward side flow path switching means 62 are connected to the heating circuit water pipe 13 and the heating circuit. The circuit water pipe 13 and the heating circuit are connected. As described above, the hot air outgoing flow path 33 and the heating return flow path 36 are connected to the hot air outgoing pipe 64 and the hot air return pipe 65, respectively, and the heating circuit in the gas hot water heater becomes a closed loop. This makes it possible to perform a bath chasing operation.

  In the gas hot-water heater which performs the bath reheating operation with the heating circuit configured as described above, the pouring operation for supplying the hot water in the bathtub and the bath reheating operation operation will be described with reference to FIG. explain. The hot water supply operation is the same as that in the first embodiment and will not be described.

  First, in the case of the pouring operation, it is the same as in the case of the first embodiment except that hot water from the hot water supply circuit is supplied from the heating side pouring flow path 68B provided with the heating side pouring electromagnetic valve 53B. is there. At this time, for example, one of the hot water supplied from the heating side pouring channel 68B flows directly from the heating return channel 36 to the bathtub 67 through the bath return pipe 65, and the other is heated to the heating return channel 36, It flows to the bathtub 67 through the heating hot water tank section closed flow path 103, the heating circuit water pipe 13, the heating high temperature forward flow path 33, and the bath forward piping 64.

Next, in the case of a bath chasing operation, when the user inputs a bath water chasing temperature (for example, 42 ° C.) with the external input means 9 and the start of the bath chasing operation is input to the control means 8, The control means 8 drives the heating / warm water circulation pump 37. When the heating / warm water circulation pump 37 starts to be driven, the bath water flows through the bath return pipe 65, the heating return flow path 36, the heating circuit water pipe 13, the heating high temperature forward flow path 33, and the bath return pipe 64 and circulates in the heating circuit. As a means for detecting whether the bath return hot water is circulating in the heating circuit, the water flow detection means 71 as described in the first embodiment is attached to the heating high temperature forward flow path 33 to detect the water flow. Can be considered. As another water flow detection method, in the configuration shown in FIG. 11, for example, the heating return thermistor 49 detects a predetermined time (for example, 2 minutes) after the control means 8 drives the heating / warm water circulation pump 37. Comparing the temperature and the temperature detected by the heating heat exchange outlet thermistor 38, and taking into consideration the individual difference variation of the detected temperature of each thermistor, if those temperature differences are within a predetermined value (for example, 0.5K), It can be judged that those temperatures are the same, and it can be judged that the bathtub water is circulating in the heating circuit.

  Here, it is considered that it takes time until the bath hot water 64 and the bath return piping 65 are longer than a predetermined value (for example, 15 m) until the bath warm water completely circulates in the bath piping and the equipment, and the water flow detection determination time. If you want to ensure enough, set a longer value (for example, 4 minutes) as the water flow detection judgment time in the control means beforehand, and when installing the equipment, the contractor etc. will set this bath pipe length with the parameter mode switching means etc. It may be switched so that the water flow detection determination time is long. When the water flow of the bath return hot water from the bathtub is detected in the heating circuit by these methods, the control means 8 starts combustion in the combustion burner 2, and the bath warm water temperature indicated by the heating heat exchange outlet thermistor 38, While detecting the bath return hot water temperature, which is the temperature of the bath water indicated by the heating return thermistor 49, the temperature detected by the heating heat exchange outlet thermistor 38 is a predetermined value (for example, set temperature (eg 42 ° C.) + 5 ° C.). Thus, the amount of combustion is adjusted by adjusting the opening degree of the gas proportional control valve 5 and opening / closing the gas flow path opening / closing valve 6D. When the bath water temperature detected by the heating return thermistor 49 reaches the hot water temperature set by the user (for example, 42 ° C.), the control means 8 stops combustion, stops the heating hot water circulation pump 37 and ends the reheating operation. To do.

  In the gas hot water heater according to the fourth embodiment of the present invention shown in FIG. 11, after the installation for performing the bath reheating operation in the heating circuit, the heating terminal is installed for the purpose of improving the user's convenience in using the equipment. In order to perform the heating operation by attaching, the contractor or the like reconnects the bath return pipe 64 to the bath return flow path 56 and the bath return pipe 65 to the bath return flow path 55 so that the heating terminal of the heating terminal is heated. The piping is connected to the heating high temperature forward flow path 33 or the heating low temperature forward flow path 32, and the heating return piping is connected to the heating return flow path 36.

  Then, the heating / warming water tank section inflow-side flow path switching means 101 and the heating / warming water tank section outflow-side flow path switching means 102 are switched so that the heating tank section closed flow path 103 is “closed”. To flow. Then, the control mode is switched to the “control mode for performing the bath reheating operation in the bath circuit” by the parameter mode switching unit provided in the control unit 8.

  Since this configuration is the same as that in the case of performing the bath reheating operation in the above-described bath circuit, the description is omitted.

  As described above, according to the present configuration, the bath reheating operation can be performed in the heating circuit or the bath circuit, and the bath water can be directly heated in the heating circuit water pipe 13, so that the thermal efficiency during the bath reheating operation can be improved. it can. In addition, even if the gas water heater / heater with this configuration is limited to the function of the bath water heater at first, due to the replacement of the bath water heater, etc. Since it can be used, the range of the purpose of using the device can be widened, and the user can easily use the device. Further, when the bath reheating operation is performed alone, only one of the bath hot water circulation pump 69 and the heating hot water circulation pump 37 needs to be driven, so that power consumption can be reduced.

(Embodiment 5)
FIG. 12 shows the configuration of a gas hot water heater in the fifth embodiment of the present invention. The difference from the second embodiment shown in FIG. 6 and the third embodiment shown in FIG. 8 in the gas hot water heater according to the fifth embodiment of the present invention is in the heating return passage 36. In addition, a heating / warming water tank section closed flow path 103 that allows heating return warm water to flow without passing through the heating / warming water tank 31, a portion that flows into the heating / warming water tank 31 through the heating return flow path 36, and the heating / warming water tank section closed flow path 103. Between the heating hot water tank section inflow side channel switching means 101 that switches the flow path between the heating hot water tank section and the heating hot water tank section closed flow path 103 and the portion that flows out of the heating hot water tank 31 in the heating return path 36. Heating / warming water tank section outflow side passage switching means 102 for switching the passage, a heating return thermistor 49 for detecting the temperature of hot water provided in the heating return passage 36 and flowing in the heating return passage 36, and a bath circuit Side pouring solenoid valve 53A and bath circuit In addition to the bath circuit side pouring flow path 68A provided with the check valve 54A, the heating circuit side pouring flow path 68B provided with the heating circuit side pouring electromagnetic valve 53B and the heating circuit side check valve 54B, and the control The means 8 is provided with a function capable of selecting a control method for performing a reheating operation of a bath with a heating circuit or a control method for performing a reheating operation of a bath with a bath circuit.

  Further, in the embodiment of the present invention, return-side channel switching means 61 for switching the channel between the heating circuit water pipe 13 and the bath return channel 55 or the heating return channel 36 shown in FIG. Outward flow path switching means 62 for switching the flow path between the heating circuit water pipe 13 and the bath forward flow path 56 or the heating high temperature forward flow path 33 as a heating forward flow path, and the heating circuit water pipe 13 side and the bath return There may or may not be a device configuration of the check function 48 for preventing the hot water backflow from the flow channel 55 side to the heating return flow channel 36 side. Therefore, in FIG. 5, in order to characterize the functions of the heating / warming water tank section closed flow path 103, the heating / warming water tank section inflow side flow path switching means 101, and the heating / warming water tank section outflow side flow path switching means 102, the return side The apparatus structure of the gas hot-water supply heater which abbreviate | omitted the flow-path switching means 61, the said outgoing side flow-path switching means 62, and the non-return function 48 is shown.

  The gas hot water heater in the fifth embodiment of the present invention shown in FIG. 12 is similar to the feature of the gas hot water heater in the fourth embodiment of the present invention, and the heating hot water tank section inflow channel switching means. 101, heating hot water tank section outflow side flow path switching means 102, heating hot water tank section closed flow path 103, heating side pouring flow path 68B provided with heating side pouring electromagnetic valve 53B, and heating return thermistor 49 are provided. This makes it possible to drive the bath with a heating circuit. Therefore, for example, even if the gas hot water heater in the fifth embodiment of the present invention is initially used only for the function of the bath water heater, the heating terminal is connected later and the original It is possible to use the function. In FIG. 12, the bath return pipe 65 is connected to the bath return flow path 55 and the bath return pipe 64 is connected to the bath forward flow path 56. However, when the bath reheating operation is performed in the heating circuit, FIG. 11, the bath return pipe 65 is connected to the heating return flow path 36, the bath return pipe 64 is connected to the heating high temperature forward flow path 33, and the heating / warming water tank section inflow side flow switching means 101 and the heating / warming water tank section outflow are connected. The side flow switching means 102 is switched so that the hot water returning from the bath flows through the heating hot water tank section closed flow channel 103.

  Hereinafter, FIG. 12 and the configuration of the bath piping will be described with reference to FIG. 11 for a pouring operation and a bath reheating operation when the heater circuit is installed so that a bath reheating operation can be performed. The hot water supply operation is similar to the case of the hot water supply operation in the configuration of the conventional gas hot water heater shown in FIG.

  First, in the case of the pouring operation, it is the same as in the case of (Embodiment 1) except that hot water from the hot water supply circuit is supplied from the heating side pouring flow path 68B provided with the heating side pouring electromagnetic valve 53B. It is. At this time, for example, one of the hot water supplied from the heating side pouring channel 68B flows directly from the heating return channel 36 to the bathtub 67 through the bath return pipe 65, and the other is heated to the heating return channel 36, It flows to the bathtub 67 through the heating hot water tank section closed flow path 103, the heating circuit water pipe 13, the heating high temperature forward flow path 33, and the bath forward piping 64.

Next, in the case of a bath chasing operation, when the user inputs a bath water chasing temperature (for example, 42 ° C.) with the external input means 9 and the start of the bath chasing operation is input to the control means 8, The control means 8 drives the heating / warm water circulation pump 37. When the heating / warm water circulation pump 37 starts to be driven, the bathtub water passes through the bath return pipe 65, the heating return flow path 36, the heating / warm water tank section closed flow path 103, the heating circuit water pipe 13, the heating high temperature forward flow path 33, and the bath forward pipe 64. It flows and circulates in the heating circuit. As a means for detecting whether the bath return hot water is circulating in the heating circuit, the water flow detecting means 71 as described in the first embodiment is attached in the heating high temperature forward flow path 33, and the heating circuit is here. The water flow inside is detected. When the flow of hot water returning from the bathtub is detected in the heating circuit, the control means 8 starts combustion in the combustion burner 2 as described in the fourth embodiment, and the heating heat exchange outlet thermistor 38. The temperature detected by the heating heat exchange outlet thermistor 38 is detected at a predetermined value (for example, a set temperature (for example, set temperature ( For example, the combustion amount is adjusted by adjusting the opening degree of the gas proportional control valve 5 and opening / closing the gas flow path opening / closing valve 6D so that it becomes 42 ° C. + 5 ° C.). When the bath water temperature detected by the heating return thermistor 49 reaches the hot water temperature set by the user (for example, 42 ° C.), the control means 8 stops combustion, stops the heating hot water circulation pump 37 and ends the reheating operation. To do.

  In addition, in the gas hot-water heater according to the fifth embodiment of the present invention shown in FIG. 12, after the installation for performing the bath renewal operation in the heating circuit, the heating terminal is used for the purpose of improving the user's equipment usage. When installing a machine and enabling heating operation, the contractor or the like reconnects the bath-out pipe 64 to the bath-out path 56 and the bath-out pipe 65 to the bath-out path 55, so that the heating terminal The heating forward pipe is connected to the heating high temperature forward path 33 or the heating low temperature forward path 32, and the heating return pipe is connected to the heating return path 36. Then, the heating / warming water tank section inflow side flow switching means 101 and the heating / warming water tank section outflow side flow path switching means 102 are switched so that the heating tank section closed flow path 103 is “closed”. Make it flow. Then, the control mode is switched to the “control mode for performing the bath reheating operation in the bath circuit” by the parameter mode switching unit provided in the control unit 8. In this case, since the return-side flow path switching means 61 and the forward-side flow path switching means 62 are not attached, the bath return hot water cannot be guided to the heating circuit water pipe 13 after the heating terminal is connected. The hot water cannot be directly heated, and even in the case of a single bathing operation, as in the case of the configuration shown in FIG. Hot water must be heated. Even after the heating terminal is connected, if the bath return warm water is led to the heating circuit water pipe 13 and directly heated during the bath independent operation, the return side flow switching means 61 and the forward flow path switching means 62 are provided. Good.

  As described above, according to the present configuration, the bath reheating operation can be performed in the heating circuit or the bath circuit, and the bathtub water can be directly heated in the heating circuit water pipe 13, so that the thermal efficiency during the bath reheating operation can be improved. it can. In addition, even if the gas water heater / heater with this configuration is limited to the function of the bath water heater at first, due to the replacement of the bath water heater, etc. Since it can be used, the range of the purpose of using the device can be widened, and the user can easily use the device. Further, when the bath reheating operation is performed alone, only one of the bath hot water circulation pump 69 and the heating hot water circulation pump 37 needs to be driven, so that power consumption can be reduced.

(Embodiment 6)
FIG. 13 shows a configuration of a gas hot water heater in the sixth embodiment of the present invention. 6 shows the configuration of the gas hot water heater in the sixth embodiment of the present invention in the second embodiment shown in FIG. 6 and the heating bath heat exchanger 60 in the third embodiment shown in FIG. Heating for heating the bath return hot water in the functional configuration of the heating bath heat exchanging unit 60 is different from the device configuration when the functional configuration is attached or the device configuration of the fifth embodiment shown in FIG. This is because the flow path through which the warm water flows is not the bath heating flow path 59 but the in-heater circulation flow path 39. By adopting this configuration, the bath heating channel 59 and the channel opening / closing valve 58 can be eliminated, so that the configuration of the heating circuit can be simplified.

  In FIG. 13, the operations during the heating independent operation, the pouring operation, and the bath reheating independent operation are the same as those described in the second embodiment shown in FIG.

  In the heating bath simultaneous operation, for example, a difference from the configuration described in the second embodiment shown in FIG. Heat exchange is performed between the heating warm water flowing through 39 and the bath return warm water flowing through the heating bath heat exchange section bath flow path 70, and the bath return warm water is heated.

  As described above, according to this configuration, at the time of bath-only operation, the return-side flow path switching means 61 and the forward-side flow path switching means 62 are switched to connect the bath circuit and the heating circuit water pipe 13 to directly heat the bath return hot water. Therefore, it is possible to improve the thermal efficiency at the time of bathing operation. Further, in the functional configuration of the heating bath heat exchanging unit 60 that performs the bath reheating operation by heating the bath return hot water with the heating warm water during the simultaneous operation of the heating bath, a dedicated bath for flowing the heating warm water to the heating bath heat exchanging unit 60 Instead of the configuration of the heating channel 59 and the channel opening / closing valve 59, the existing circulation channel 39 in the heater is used, so that the configuration of the heating circuit can be simplified. Further, when the bath is chasing alone, only the bath hot water circulation pump 69 needs to be driven, so that power consumption can be reduced.

(Embodiment 7)
FIG. 14 shows the configuration of the gas hot water heater in the seventh embodiment of the present invention. The gas water heater according to the seventh embodiment of the present invention is different from the apparatus configuration of the sixth embodiment shown in FIG. 13 in that the flow path diameter is variable in the circulation channel 39 in the heater. An in-machine circulation flow path varying means 104 is provided.

  Heating hot / warm water flowing through the circulation path 39 in the heater is circulated only in the machine and is not supplied to each heating terminal, and therefore cannot be reflected in the heat radiation action in each heating terminal. Therefore, in terms of the heating / warming water transfer performance for transporting the heating / warming water to each heating terminal, the flow path design is such that the heating / warming water flow rate flowing through the circulation passage 39 in the heater is normally about 1 L / min. Further, for example, in the configuration of the gas hot water heater in the second embodiment of the present invention shown in FIG. 6, the heating hot water flowing through the bath heating channel 59 is not supplied to each heating terminal. When the number of heating terminal use systems is large at the time of simultaneous operation (for example, six systems), the heating warm water is not sufficiently conveyed to each heating terminal, and the heating performance at each heating terminal is deteriorated. Therefore, it is better that the flow rate of the heating / warming water flowing through the bath heating channel 59 is small in terms of the capability of conveying the heating / warming water to each heating terminal during the simultaneous operation of the heating bath. On the other hand, in the aspect of heating the hot water in the heating / bath heat exchanging unit 60, the heat flow to the hot water returning to the hot water is promoted when the flow rate of the hot heating / warming water is large, and the time until the bath reheating operation is completed. Shortened.

  Therefore, in the configuration of the gas hot water heater in the seventh embodiment of the present invention, the heater circulation path variable means 104 is provided in the heater circulation path 39, and each of the heating independent operation and the heating bath simultaneous operation is provided. It is possible to supply the heating outgoing / warm water flow rate that flows through the optimum circulation path 39 in the heater during operation. Here, as the circulating passage variable means 104 in the heater, for example, a hot water supply bypass control valve 29 that adjusts the valve opening degree by driving the stepping motor by the pulse opening / closing signal from the control means 8 described in the conventional example. A configuration of a flow path variable valve is conceivable.

Hereinafter, the operation and action of the gas hot water heater according to the seventh embodiment of the present invention will be described with reference to FIG. In addition, each operation | movement at the time of the pouring operation which supplies the amount of hot water in a bathtub, and a bath chasing single operation is the same as that of the case described in 2nd Embodiment, for example, and it abbreviate | omits. However, in the configuration of the gas hot water heater that does not have the return-side channel switching unit 61 and the forward-side channel switching unit 62 cited in FIG. In the apparatus configuration in which the warm water is not allowed to flow and the bath return warm water is indirectly heated with the heating warm water heated by the heating bath heat exchanging unit 60, the circulation channel variable means in the heater according to the seventh embodiment of the present invention is used. In the case of applying the function 104, the heating-in-circulation flow path varying means 104 is fully opened in order to supply more heating outgoing / warm-up water to the in-heater circulation flow path 39 during the bath-only operation.

  First, at the time of heating independent operation, a certain period of time (for example, 1 to 2 minutes) from the start of heating operation to the opening of the flow path opening / closing valve in the heating forward pipe to each heating terminal is the circulation path 39 in the heater. It is preferable that the flow rate of heating warm water flowing through the channel is higher because the internal pressure in the heating circuit does not increase. Therefore, for example, when the apparatus is not performing the heating operation, the control means 8 drives the heater circulation path variable means 104 to the fully open side, and after the heating operation start input is made to the control means 8, After a time (for example, 3 minutes), it is determined that the flow path opening / closing valve in the heating forward pipe to each heating terminal is “open”, and the control means 8 fully closes the circulation path variable means 104 in the heater, Alternatively, control is performed so that the valve opening is such that a very minimum flow rate (for example, 0.5 L / min) flows. In this way, during heating independent operation, when heating warm water actually flows to each heating terminal, more heating warm water can be conveyed to each heating terminal.

  Next, at the time of heating bath simultaneous operation, it is better that the flow amount of heating warm water flowing through the circulation passage 39 in the heater is larger when the bath reheating operation side that heats the return water of the bath is heated. If it is on the heating operation side that transports the air, it is better that the flow rate of the heating warm water flowing through the circulation passage 39 in the heater is small. Therefore, for example, an operation control may be considered in which the opening degree of the circulation channel variable means 104 in the heater is adjusted according to the number of systems used for the heating terminal.

  Assuming that the total number of heating terminals connected to the gas hot water heater is six, the number of heating terminals used during simultaneous heating bath operation is one to two, and three to four. In the case of 5 to 6 systems and 3 stages, for example, in the case of 1 to 2 systems in which the number of heating terminal use systems is small and the heating hot water transfer flow rate is sufficient, the circulation channel variable means 104 in the heater is used. The heating recirculation operation is promoted by increasing the flow rate of heating hot water flowing through the circulation path 39 in the heater by setting the opening degree of the heater to 70%. In the case of 5 to 6 systems, when the number of heating use systems increases with the opening degree of the circulation channel variable means 104 in the heater being 30%, the heating hot water flowing through the circulation channel 39 in the heater Reduce flow rate Controlling operation that enhances the heating 往温 water carrying capacity to the heating terminal Te.

  Or, even when the number of heating-use terminal systems is large, such as 5 or 6 systems, when the user wants to prioritize the bath chasing operation, priority is given to the bath chasing operation using the external input means 9, for example. If such an input is performed, it is possible to perform an operation control so that the opening degree of the circulation channel variable means 104 in the heater is set to 50%.

  As described above, according to this configuration, at the time of bath-only operation, the return-side flow path switching means 61 and the forward-side flow path switching means 62 are switched to connect the bath circuit and the heating circuit water pipe 13 to directly heat the bath return hot water. Therefore, it is possible to improve the thermal efficiency at the time of bathing operation. Further, in the functional configuration of the heating bath heat exchanging unit 60 that performs the bath reheating operation by heating the bath return warm water with the heating warm water during the simultaneous operation of the heating bath, it flows through the circulation channel 39 in the heater according to the sixth embodiment. In addition to the configuration in which heat exchange is performed with the heating warm water, the heating warm water flow rate flowing through the circulation channel 39 in the heater can be adjusted according to the number of heating terminal use systems and the usage pattern of the user. It is possible to improve the heating performance at the time of heating bath simultaneous operation or the bath reheating operation performance. Further, when the bath is chasing alone, only the bath hot water circulation pump 69 needs to be driven, so that power consumption can be reduced.

(Embodiment 8)
FIG. 15 shows the configuration of the gas hot water heater in the eighth embodiment of the present invention. FIG. 6 shows the configuration of the gas hot water heater in the eighth embodiment of the present invention according to the second embodiment. FIG. 8 shows the configuration of the heating bath heat exchanger 60 in the third embodiment shown in FIG. The difference between the device configuration when the functional configuration is attached or the device configuration of the fifth embodiment shown in FIG. 12 is provided with the heater circulation path variable means 104 in the heater circulation path 39. By the way. By providing the heater internal circulation flow path variable means 104, the heating air circulation flow path variable means 104 is driven to realize the optimum flow rate of the heating warm water flowing through the circulation path 39 in the heater according to the operating condition of the equipment. Can be made.

  Hereinafter, the operation and action of the gas hot water heater in the eighth embodiment of the present invention will be described with reference to FIG. In addition, each operation | movement at the time of the pouring operation which supplies the amount of hot water in a bathtub, and a bath chasing single operation is the same as that of the case described in 2nd Embodiment, for example, and it abbreviate | omits. However, in the configuration of the gas hot water heater without the return side channel switching unit 61 and the forward side channel switching unit 62 cited in FIG. In the device configuration in which the warm water cannot flow but the heated hot water heated by the heated bath heat exchanging unit 60 is indirectly heated by the heated warm water, the circulation channel variable means in the heater according to the eighth embodiment of the present invention is used. When the function 104 is applied, during the bath reheating independent operation, in order to supply more heating warm water to the bath heating flow path 59, the circulation channel variable means 104 in the heater is fully closed.

  First, at the time of heating independent operation, as in the case of the seventh embodiment, at the start of heating operation, the flow rate of the heating warm water flowing through the circulation passage 39 in the heater is increased to suppress the increase of the internal pressure in the heating circuit. When the heating warm water is supplied to the terminal, the heating warm water flow through the circulation passage 39 in the heater is set to zero or the minimum amount, and as much heating warm water as possible is conveyed to each heating terminal, thereby improving the heating performance. Can be improved.

  Next, at the time of simultaneous operation of the heating bath, the heating hot water flow rate through the circulation passage 39 in the heater is set to zero or a very minimum amount (for example, 0.5 L / min), and as much heating outgoing hot water as possible for each heating terminal or bath heating. It can be made to convey to the flow path 59, and can improve the heating performance at the time of simultaneous operation of a heating bath, and a bath reheating performance.

  As described above, according to this configuration, at the time of bath-only operation, the return-side flow path switching means 61 and the forward-side flow path switching means 62 are switched to connect the bath circuit and the heating circuit water pipe 13 to directly heat the bath return hot water. Therefore, it is possible to improve the thermal efficiency at the time of bathing operation. Further, since the circulating flow rate in the heater can be zero or a minimum amount at the time of the simultaneous operation of the heating bath, more heating warm water can be conveyed to each heating terminal or the bath heating channel 59, and the heating performance In addition, bathing performance can be improved. Further, when the bath is chasing alone, only the bath hot water circulation pump 69 needs to be driven, so that power consumption can be reduced.

(Embodiment 9)
FIG. 16 shows the configuration of the gas hot water heater in the ninth embodiment of the present invention. 6 shows the configuration of the gas hot water heater in the ninth embodiment of the present invention in the second embodiment shown in FIG. 6, and the heating bath heat exchanger 60 in the third embodiment shown in FIG. The difference between the device configuration when the functional configuration is attached or the device configuration of the fifth embodiment shown in FIG. 12 is that the diameter of the bath heating channel 59 is varied in the bath heating channel 59. A bath heating flow path varying means 105 is provided. Since the bath heating channel varying means 105 can be fully closed, the channel opening / closing valve 58 for opening and closing the bath heating channel 59 is omitted in FIG. Here, as the configuration of the bath heating flow path variable means 105, for example, the stepping motor is driven by a pulse opening / closing signal from the control means 8 similar to the circulating flow path variable means 104 in the heater to adjust the valve opening. A configuration of a variable flow path valve is conceivable. By driving the bath heating flow path varying means 105, the heating warm water flow rate flowing through the bath heating flow path 49 can be adjusted.

  Hereinafter, operation | movement and an effect | action of the gas water heater in the 9th Embodiment of this invention are demonstrated, using FIG. In addition, each operation | movement at the time of the pouring operation which supplies the amount of hot water in a bathtub at the time of heating independent operation, and the time of the bath reheating independent operation is the same as that of the case described in 2nd Embodiment, for example, and it abbreviate | omits. However, in the configuration of the gas hot water heater that does not have the return-side channel switching unit 61 and the forward-side channel switching unit 62 cited in FIG. The bath heating channel variable means according to the ninth embodiment of the present invention has a device configuration in which warm water cannot flow and the bath return warm water is indirectly heated by the heating warm water heated by the heating bath heat exchanging unit 60. When the function 105 is applied, the bath heating flow path changing means 105 is fully opened in order to supply more heating outgoing hot water to the bath heating flow path 59 during the bath reheating independent operation.

  At the time of heating bath simultaneous operation, as described in the seventh embodiment, for example, operation control may be considered in which the opening degree of the bath heating flow path varying means 105 is adjusted according to the number of heating terminal use systems. Assuming that the total number of heating terminals connected to the gas hot water heater is six, the number of heating terminals used during simultaneous heating bath operation is one to two, and three to four. In the case of 5 to 6 systems and 3 stages, for example, in the case of 1 to 2 systems where the number of heating terminal use systems is small and the heating / warming water transfer flow rate is sufficient, the bath heating channel variable means 105 The opening amount of the heating is increased to 70% to increase the flow rate of the heating warm water flowing through the bath heating flow path 59 to promote the bath replenishment operation. In the case of 5 to 6 systems, the heating heating temperature water flowing through the bath heating channel 59 is increased when the number of heating systems increases with the opening of the bath heating channel variable means 105 being 30%. Reduce the flow rate for each heating Controlling operation that enhances the heating 往温 water conveying capacity to end machine.

  Alternatively, even when the number of heating-use terminal systems is large, such as 5 or 6 systems, when the user wants to prioritize the bath chasing operation, priority is given to the bath chasing operation using the external input means 9, for example. If such an input is performed, operation control can be performed so that the opening degree of the bath heating flow path variable means 105 is 50%.

  As described above, according to this configuration, at the time of bath-only operation, the return-side flow path switching means 61 and the forward-side flow path switching means 62 are switched to connect the bath circuit and the heating circuit water pipe 13 to directly heat the bath return hot water. Therefore, it is possible to improve the thermal efficiency at the time of bathing operation. Moreover, at the time of heating bath simultaneous operation, the flow rate of heating warm water flowing through the bath heating flow path 59 can be adjusted according to the number of systems used for the heating terminal and the usage pattern of the user. The performance or the performance of bathing can be improved. Further, when the bath is chasing alone, only the bath hot water circulation pump 69 needs to be driven, so that power consumption can be reduced.

  As described above, the gas hot water heater according to the present invention can be operated with hot water supply, heating, and bath water pipes by arranging two water pipes of a hot water circuit water pipe and a heating circuit water pipe in a single heat exchanger. In the apparatus configuration, bath hot water or heating hot water can be guided to the heating circuit water pipe by switching the flow path, and the hot water can be directly heated in the heat exchanger, so that the thermal efficiency can be improved. Therefore, it is not limited to gas water heaters and heat source machines that have fewer water pipes that are directly heated in the heat exchanger than the number of hot water pipes to be heated. The present invention can also be applied to an application for improving the thermal efficiency by directing each hot water to the heating water pipe and directly heating it.

The block diagram of the gas hot-water heater in Embodiment 1 of this invention The figure which showed the flow of the heating hot water at the time of heating independent operation of the gas hot-water heater The figure which showed the flow of the pouring water at the time of performing pouring operation of the gas hot-water supply heater alone The figure which showed the flow of the pouring water and the heating hot water when performing the heating operation while performing the pouring operation of the gas hot water heater The figure which showed the flow of the bath warm water at the time of the bath chasing independent operation of the gas hot water heater The block diagram of the gas hot-water heater in Embodiment 2 of this invention The figure which shows another structure of the gas hot-water supply heater The block diagram of the gas hot-water heater in Embodiment 3 of this invention Configuration diagram of the heating bath heat exchanger showing the retrofit state of the gas hot water heater The block diagram of the gas hot-water heater in Embodiment 4 of this invention The figure which shows the structure which performs the bath chasing operation with the heating circuit of the same gas hot-water heater The block diagram of the gas hot-water heater in Embodiment 5 of this invention The block diagram of the gas hot-water heater in Embodiment 6 of this invention The block diagram of the gas hot-water heater in Embodiment 7 of this invention Configuration diagram of gas hot water heater in Embodiment 8 of the present invention The block diagram of the gas hot-water heater in Embodiment 9 of this invention Configuration diagram of conventional gas hot water heater Configuration diagram of another conventional gas hot water heater Configuration diagram of heating and hot water tank

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Combustion burner 3 Fuel gas supply part 4 Combustion fan 8 Control means 13 Heating circuit water pipe 31 Heating hot water tank 33 Heating high temperature forward flow path 36 Heating return flow path 37 Heating hot water circulation pump 39 Heating machine circulation flow path 48 Non-return function 49 Heating return thermistor 55 Bath return flow path 56 Bath forward flow path 58 Flow path opening / closing valve 59 Bath heating flow path 60 Heating bath heat exchange section 61 Return side flow path switching means 62 Outward flow path switching means 63 Flow Path opening / closing valve 68A Bath circuit side pouring flow path 68B Heating circuit side pouring flow path 69 Bath hot water circulation pump 70 Heating bath heat exchange section bath flow path 101 Heating hot water tank section inflow path switching means 102 Heating hot water tank section outflow Side flow path switching means 103 Heating hot water tank section closed flow path 104 Heating machine circulation flow path variable means 105 Bath heating flow path variable means

Claims (2)

A single heat exchanger in which a heating circuit water pipe through which hot water used for heating and bath flows and a hot water circuit water pipe through which hot water used for hot water supply flows, a single combustion burner for heating the heat exchanger, A fuel gas supply unit for supplying fuel gas to the combustion burner, a single combustion fan for sending combustion air to the combustion burner, a bath return channel and a bath outbound channel as a transport path for bath hot water, Bath hot water circulation pump for transporting hot bath water through the transport path, heating return flow path and heating forward flow path as a transport path for heating hot water, and heating hot water circulation pump for transporting heating hot water through the transport path A heating / warming water tank for securing an appropriate amount of heating / warming water, a circulation passage in the heater for bypassing the heating / warming water to the inside of the apparatus, and the bath conveyance path or the heating conveyance path with respect to the heating circuit water pipe A return-side channel switching means and a forward-side channel switching means for performing channel switching, a heating / warming water tank section closed channel for flowing heating return warm water without passing through the heating / warming water tank, and the heating return channel Heating / warming water tank section inflow side flow switching means for switching the flow path between a portion flowing into the heating / warming water tank and the heating / warming water tank section closed flow path, and outflowing from the heating / warming water tank through the heating return flow path Heating hot water tank section outflow side flow path switching means for switching the flow path between the portion and the heating hot water tank section closed flow path, and the hot water temperature that is provided in the heating return flow path and flows through the heating return hot water flow path A heating return thermistor for detecting water, a flow opening / closing valve and a check function, a bath circuit side pouring channel through which hot water for pouring from the hot water supply circuit side to the bath circuit side flows, A check function is provided to pour hot water from the hot water supply circuit side to the heating circuit side. A heating circuit side pouring flow path through which hot water flows and control means, and the single heat exchange is performed by switching the transport path by the return side flow path switching means and the forward side flow path switching means. Gas with a function that enables hot water supply operation, heating operation, and bath operation with a heater, and also allows you to select whether to perform bath reheating operation with a heating circuit or bath reheating operation with a bath circuit Hot water heater. A single heat exchanger in which a heating circuit water pipe through which hot water used for heating and bath flows and a hot water circuit water pipe through which hot water used for hot water supply flows, a single combustion burner for heating the heat exchanger, A fuel gas supply unit for supplying fuel gas to the combustion burner, a single combustion fan for sending combustion air to the combustion burner, a bath return channel and a bath outbound channel as a transport path for bath hot water, Bath hot water circulation pump for transporting hot bath water through the transport path, heating return flow path and heating forward flow path as a transport path for heating hot water, and heating hot water circulation pump for transporting heating hot water through the transport path A heating / warming water tank for securing an appropriate amount of heating / warming water, a circulation passage in the heater for bypassing the heating / warming water to the inside of the apparatus, and the bath conveyance path or the heating conveyance path with respect to the heating circuit water pipe Return-side flow path switching means and forward-side flow path switching means for performing flow path switching, a heating / bath heat exchanging section for exchanging heat between heating hot water and bath hot water, and the heating branched from the heating forward flow path A bath heating flow path that flows through a bath heat exchange section, a flow path opening / closing valve that opens and closes the bath heating flow path, and a heating bath heat exchange section connected to a bath return flow path and a bath forward flow path Heating bath heat exchange section bath flow path flowing through, a flow path opening / closing valve for opening and closing the heating bath heat exchange section bath flow path, and a heating hot water tank for flowing heating return hot water without passing through the heating hot water tank A heating / warm water tank unit inflow channel switching means for switching a channel between a part closed channel, a portion that flows into the heating / warming water tank in the heating return channel, and the heating / warm water tank unit closed channel; A portion of the heating return passage that flows out of the heating / warming water tank and the heating / warming water tank A heating / warming water tank section outflow side flow path switching means for switching the flow path to / from the closed section flow path, and a hot water temperature that is provided in the heating return flow path and that flows through the heating return warm water path Heating return thermistor, flow path opening / closing valve and check function provided, bath circuit side pouring flow path for supplying hot water from the hot water supply circuit side to the bath circuit side, and flow check valve and check function A heating circuit side pouring channel through which hot water for pouring hot water from the hot water supply circuit side to the heating circuit side and a control unit are provided, and the transport path is defined by the return side channel switching unit and the forward side channel switching unit. By switching, the single heat exchanger enables hot water supply, heating, single operation of the bath, and simultaneous operation of heating and bath, and also performs the bath reheating operation with the heating circuit or the bath circuit with the bath circuit. Gas with a function that allows you to choose whether to drive after Hot water heater.

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