JP7685698B2 - Hybrid water heater - Google Patents

Description

The present invention relates to a hybrid hot water supply device that is configured to automatically supply hot water from a hot water storage tank to a hot water tap by setting the control unit to an emergency water extraction mode when the water supply is cut off.

In a hybrid hot water supply system that is equipped with a heat pump heat source unit, a combustion-type auxiliary heat source unit, a hot water storage tank, and a control unit, if the water supply is cut off, the water supply pressure to the hot water storage tank will no longer be applied, and hot water in the hot water storage tank cannot be supplied to the first valve. Therefore, hot water is normally drawn into a container from the drain valve that is used to drain the hot water from the hot water storage tank.

In the hot water storage unit described in Patent Document 1, the drain plug for draining hot water from the hot water storage tank is provided with an engagement member made of an elastic material that engages with the mouth of a plastic bottle that receives the drained water, on the screw-type plug body that drains water from the tip.

In the hot water storage type electric water heater described in Patent Document 2, a pump is provided in the bypass pipe connecting the bottom of the hot water storage tank to the hot water outlet pipe, and when the water supply is cut off, the pump is operated to allow hot water to be drawn from the hot water tap.

In the hot water storage type water heater described in Patent Document 3, hot water taken from the bottom of the hot water storage tank is sent to a heat pump by a hot water storage pump, and is configured so that it can be heated by the heat pump and then poured directly into the bathtub.

JP 2020-101347 A Patent No. 6066452 Patent No. 6895766

The object of the present invention is to provide a hybrid hot water supply system that can automatically supply hot water from a hot water storage tank to a hot water tap in the event of a water outage.

The hybrid hot water supply device of claim 1 is a hybrid hot water supply device including a heat pump heat source unit, a combustion-type auxiliary heat source unit, a hot water storage tank, and a control unit, and further includes an operation terminal for operating the hybrid hot water supply device, and when a water outage is detected, the operation terminal issues an alert, and when an emergency water extraction mode is set in the control unit from the operation terminal, the control unit operates a circulation pump provided in a hot water passage that supplies hot water from the hot water storage tank to the auxiliary heat source unit, and supplies hot water in the hot water storage tank to the hot water tap, provided that an air vent that introduces air into the hot water storage tank is opened.

According to the above configuration, when a water outage is detected, a notification is sent from the operation terminal, allowing the user to know about the occurrence of a water outage at an early stage. When the emergency water extraction mode is set for the control unit from the operation terminal, the control unit operates a circulation pump provided in a hot water passage that supplies hot water from the hot water storage tank to the auxiliary heat source unit, providing that an air vent that introduces air into the hot water storage tank is opened, and supplies the hot water in the hot water storage tank to the hot water tap, so that the hot water in the hot water storage tank can be extracted from the hot water tap. In this way, it is convenient to be able to extract hot water from the hot water storage tank from the hot water tap.

It is assumed that when the emergency water withdrawal mode is set, the hot water tap is opened.
Furthermore, when supplying hot water via the auxiliary heat source unit as described above, the hot water may be heated by the auxiliary heat source unit as necessary.

The hybrid hot water supply device of claim 2 is a hybrid hot water supply device including a heat pump heat source unit, a combustion-type auxiliary heat source unit, a hot water storage tank, and a control unit, and further includes an operation terminal for operating the hybrid hot water supply device, and when a water outage is detected, the operation terminal issues an alert, and when an emergency water extraction mode is set in the control unit from the operation terminal, the control unit operates a hot water storage pump provided in a hot water passage that supplies hot water from the hot water storage tank to the heat pump heat source unit, and supplies hot water in the hot water storage tank to the hot water tap, provided that an air vent that introduces air into the hot water storage tank is opened.

According to the above configuration, when a water outage is detected, a notification is sent from the operation terminal, allowing the user to know about the occurrence of a water outage at an early stage. When the emergency water extraction mode is set for the control unit from the operation terminal, provided that the air vent that introduces air into the hot water tank is opened, the control unit operates a hot water storage pump provided in a hot water passage that supplies hot water from the hot water storage tank to the heat pump heat source unit, and supplies the hot water in the hot water storage tank to the hot water tap, so that the hot water in the hot water storage tank can be extracted from the hot water tap. In this way, it is convenient to be able to extract hot water from the hot water storage tank from the hot water tap.

It is assumed that when the emergency water withdrawal mode is set, the hot water tap is opened.
Furthermore, when supplying hot water via the heat pump heat source unit as described above, the hot water may be heated by the heat pump heat source unit as necessary.

The hybrid water heating device of claim 3 is characterized in that, in the invention of claim 1, the emergency water extraction mode is terminated when a water outage is no longer detected, when the circulation pump is detected running freely, or when an operation to cancel the emergency water extraction mode is performed from the operating terminal.
According to the above configuration, when a water outage is no longer detected, or when the circulation pump is detected running idly, or when an operation to cancel the emergency water extraction mode is performed from the operation terminal, there is no need to continue the emergency water extraction mode, so the emergency water extraction mode is terminated.

The hybrid water heating device of claim 4 is characterized in that, in the invention of claim 2, the emergency water extraction mode is terminated when a water outage is no longer detected, when idling of the hot water storage pump is detected, or when an operation to cancel the emergency water extraction mode is performed from the operating terminal.
According to the above configuration, the same effects and advantages as those of claim 3 are achieved.

The present invention provides the various functions and effects described above.

1 is a configuration diagram of a hybrid water heater according to a first embodiment of the present invention. FIG. 2 is a configuration diagram of a heat pump heat source machine. FIG. 11 is a configuration diagram of a hybrid hot water supply device according to a second embodiment. FIG. 11 is a configuration diagram of a hybrid hot water supply device according to a third embodiment.

The following describes the embodiment of the present invention with reference to the drawings.

A hybrid hot water supply apparatus 1 according to a first embodiment will be described with reference to FIG.
This hybrid hot water supply device 1 has a heat pump heat source unit 10 and a hot water storage and supply unit 20 capable of storing hot water heated by this heat pump heat source unit 10.

The hot water storage and supply unit 20 includes a hot water storage tank 21 for storing hot water, a combustion-type auxiliary heat source unit 22 that uses the heat of fuel combustion to heat the hot water, a mixing valve 23 that mixes high-temperature hot water with tap water, and a control unit 24 (control means) that controls the hybrid hot water supply device 1. The hybrid hot water supply device 1 is configured to store high-temperature hot water in the hot water storage tank 21, which is heated by the heat of outside air using the heat pump heat source unit 10, mix the high-temperature hot water in the hot water storage tank 21 with tap water using the mixing valve 23, and supply hot water at the hot water supply setting temperature to, for example, the hot water tap 9.

The auxiliary heat source unit 22 includes a blower fan 22a, a burner 22b, a heat exchanger 22c, etc., and heats the drinking water using the heat of combustion of fuel (e.g., city gas) supplied from the outside.

The control unit 24 predicts future hot water usage based on the learned and stored hot water usage history, and controls the hot water storage operation so that the heat amount equivalent to the predicted hot water usage is stored in the hot water storage tank 21 before the predicted hot water usage. In addition to the hot water storage operation and hot water supply operation described above, the control unit 24 stores a control program that controls the hot water filling operation, reheating operation, etc. based on detection signals from various sensors. The control unit 24 also controls the heat pump heat source unit 10 based on the inlet water temperature to the heat pump heat source unit 10 and the outside air temperature.

A circulation forward passage 25 that supplies hot water from the hot water tank 21 to the heat pump heat source unit 10 is connected to the bottom of the hot water tank 21, and a circulation return passage 26 that returns hot water heated by the heat pump heat source unit 10 to the hot water tank 21 is connected to the top of the hot water tank 21. The circulation forward passage 25 is equipped with a hot water storage pump 27 for sending hot water from the hot water tank 21 to the heat pump heat source unit 10. Note that the heat pump heat source unit 10 may also be equipped with something equivalent to the hot water storage pump 27.

A circulation outgoing temperature sensor 25a is provided in the circulation outgoing passage 25 to detect the temperature of the hot water supplied to the heat pump heat source unit 10. A circulation return temperature sensor 26a is provided in the circulation return passage 26 to detect the temperature of the hot water heated by the heat pump heat source unit 10.

A water supply passage 28 is connected to the bottom of the hot water storage tank 21 to supply clean water from a water supply inlet 42 to the hot water storage tank 21. A pressure gauge 43 is provided in the water supply inlet 42 to detect the water pressure of the clean water, and the detection signal is supplied to the control unit 24.

A water supply temperature sensor 28a that detects the temperature of the tap water is provided in the water supply passage 28, and a drain passage 29 equipped with a drain plug 29a is connected near the connection of the water supply passage 28 with the hot water storage tank 21. A hot water outlet passage 30 is connected to the top of the hot water storage tank 21 for discharging hot water from the hot water storage tank 21 using the supply pressure of the tap water.

In the hot water storage tank 21, a plurality of hot water temperature sensors 21a to 21e are arranged at predetermined intervals in the height direction of the hot water storage tank 21 in order to detect the temperature of the hot water therein.
An air vent that is opened and closed by an electromagnetic on-off valve 41 is connected to the top of the hot water storage tank 21 .
A hot water storage tank outlet temperature sensor 21f is disposed near the connection of the hot water outlet passage 30 with the hot water storage tank 21 to detect the temperature of the hot water being discharged from the hot water storage tank 21 to the hot water outlet passage 30. The hot water storage tank 21, including the hot water storage temperature sensors 21a to 21e and the hot water storage tank outlet temperature sensor 21f, is covered with a heat insulating member (not shown) to prevent heat loss of the hot water stored during hot water storage operation and to slow down the temperature drop.

The mixing valve 23 is connected to a first branch passage 31 branched off from the water supply passage 28, a hot water outlet passage 30, and a hot water supply passage 32. The mixing valve 23 is configured to be able to adjust the mixing ratio of the high-temperature hot water supplied from the hot water outlet passage 30 and the low-temperature clean water supplied from the first branch passage 31. The hot water mixed by the mixing valve 23 is supplied to the hot water supply passage 32 and is supplied from the hot water tap 9, etc.

A mixing valve inlet temperature sensor 30a that detects the temperature of the hot water supplied to the mixing valve 23 is disposed in the hot water outlet passage 30 near the high-temperature water inlet of the mixing valve 23. A hot water supply passage 32 extending from the mixing valve 23 is disposed with a hot water supply flow rate sensor 32a that detects the hot water supply flow rate, a hot water supply temperature sensor 32b that detects the hot water supply temperature, and a hot water supply flow rate adjustment valve 32c that adjusts the hot water supply flow rate.

A second branch passage 33 branches off from the water supply passage 28, and this second branch passage 33 is connected to a reheating circulation passage 34. The reheating circulation passage 34 is connected to the auxiliary heat source unit 22 and the reheating heat exchanger 35, and has a circulation pump 36 on the hot water inlet side of the auxiliary heat source unit 22 to supply hot water to the auxiliary heat source unit 22.

Between the outlet of the circulation pump 36 of the reheating circulation passage 34 and the inlet of the auxiliary heat source unit 22, an inlet temperature sensor 34a that detects the temperature of the hot water supplied to the auxiliary heat source unit 22 and a circulation flow rate sensor 34b that detects the flow rate are arranged. An outlet temperature sensor 34c that detects the temperature of the hot water heated by the auxiliary heat source unit 22 is arranged in the reheating circulation passage 34 on the outlet side of the hot water of the auxiliary heat source unit 22. In addition, the reheating circulation passage 34 has an opening/closing solenoid valve 34d for opening and closing the reheating circulation passage 34 on the outlet side of the reheating heat exchanger 35. The second branch passage 33 is connected between the circulation pump 36 and the opening/closing solenoid valve 34d.

A reheating passage 38 equipped with a bathtub pump 37 for circulating hot water in a bathtub (not shown) is connected to the reheating heat exchanger 35. This reheating heat exchanger 35 heats the hot water in the bathtub circulating through the reheating passage 38 by exchanging heat with the high-temperature hot water heated by the auxiliary heat source unit 22. A hot water supply passage 39 branched off from the hot water supply passage 32 at the hot water supply flow rate adjustment valve 32c is connected to the reheating passage 38, and is configured so that hot water can be poured (filled) into the bathtub via the reheating passage 38.
The pouring passage 39 is provided with a pouring water amount sensor 39a, a pouring solenoid valve 39b, and a check valve 39c.

A combustion hot water outlet passage 40 branches off from the reheating circulation passage 34 between the outlet temperature sensor 34c and the reheating heat exchanger 35 and is connected to the hot water outlet passage 30. The combustion hot water outlet passage 40 is equipped with a flow control valve 40a (tank water proportional valve) for adjusting the amount of hot water supplied to the hot water outlet passage 30. Hot water heated by the auxiliary heat source unit 22 can be supplied to the hot water outlet passage 30 via the combustion hot water outlet passage 40.

The control unit 24 operates devices such as valves and pumps arranged in each part based on the detected temperature of the temperature sensors arranged in each part such as the hot water storage temperature sensor 21a, and the detected flow rate of the hot water supply flow rate sensor 32a, to perform various operational controls. The control unit 24 also has a timekeeping function and a function to learn and store the hot water supply usage history. An operation terminal 24a is communicatively connected to this control unit 24. The operation terminal 24a has an operation unit and a display unit for operating the hot water storage and hot water supply system 1 and various setting operations such as the hot water supply setting temperature, and a communication unit for communicating with a communication network (home network) within the home. The home network is maintained in a communicative state by receiving power from a battery (not shown) even during a power outage of the commercial power source 2.

The heat pump heat source unit 10 will be described with reference to FIG.
The heat pump heat source unit 10 is configured by connecting a compressor 11, a condensing heat exchanger 12, an expansion valve 13, and an evaporative heat exchanger 14 by a refrigerant circuit 15. In this heat pump heat source unit 10, the refrigerant sealed in the refrigerant circuit 15 is compressed by the compressor 11 to a high temperature. Then, hot water in the hot water storage tank 21, which is supplied from the circulation path 25 by driving the hot water storage pump 27, is heated by heat exchange with the high-temperature refrigerant in the condensing heat exchanger 12. The refrigerant whose temperature has been reduced after the heat exchange expands in the expansion valve 13 to a temperature lower than the outside air, absorbs heat from the outside air in the evaporative heat exchanger 14, and is then introduced back into the compressor 11. The evaporative heat exchanger 14 is equipped with a blower 16 and an outside air temperature sensor 17 that detects the outside air temperature.

Next, the hot water storage operation will be described.
The control unit 24 predicts the future hot water usage time and hot water usage amount based on the learned and stored hot water usage history, and controls the hot water storage operation so that hot water storage is completed just before the predicted hot water usage. At this time, the control unit 24 operates the hot water storage pump 27 and the heat pump heat source unit 10 to start the hot water storage operation, and ends the hot water storage operation when the amount of heat equivalent to the predicted hot water usage amount is stored.

Next, the hot water supply operation will be described.
In the hot water supply operation for supplying hot water at the hot water supply set temperature, the control unit 24 adjusts the mixing ratio of the mixing valve 23 based on the temperatures detected by the mixing valve inlet temperature sensor 30a, the water supply temperature sensor 28a, and the hot water temperature sensor 32b, thereby supplying hot water adjusted to the hot water supply set temperature. At this time, the control unit 24 performs the hot water supply operation using the hot water stored in the hot water storage tank 21 by the hot water storage operation. In addition, the control unit 24 learns and stores the hot water supply usage history during the hot water supply operation, including, for example, the time of hot water supply use (hot water supply usage time), the hot water supply flow rate detected by the hot water supply flow rate sensor 32a, the hot water supply time, the hot water supply flow rate, and the hot water supply amount of the hot water storage tank 21 calculated from the mixing ratio of the mixing valve 23.

For example, if the stored hot water is used up during hot water supply operation and there is no hot water in the hot water storage tank 21 that is at a temperature that can be used for hot water supply, the control unit 24 drives the circulation pump 36 and performs hot water supply operation using high-temperature hot water obtained by heating clean water supplied from the water supply passage 28 and the reheating circulation passage 34 with the auxiliary heat source unit 22. Also, for example, when hot water at a higher temperature than the stored hot water is to be supplied due to a change in the hot water supply setting temperature, the control unit 24 performs hot water supply operation using high-temperature hot water obtained by heating clean water supplied from the water supply passage 28 and the reheating circulation passage 34 with the auxiliary heat source unit 22.

Next, a hot water supply control during a water outage will be described, in which hot water in the hot water storage tank 21 is automatically supplied to the hot water tap 9 by the control of the control unit 24 in response to a command from the operation terminal 24a when a water outage occurs.
The control program for controlling hot water supply during water outage is stored in advance in the control unit 24.

When a water outage occurs and the water supply pressure drops to near zero, the control unit 24 detects the water outage based on the detection signal from the pressure sensor 43 and transmits the information to the operation terminal 24a. When this water outage is detected, the operation terminal 24a notifies the user. The user then sets the emergency water extraction mode for the control unit 24 from the operation terminal 24a and opens the hot water tap.

When the emergency water extraction mode is set, the controller 24 opens the flow rate control valve 40a (tank water proportional valve), closes the electromagnetic on-off valve 34d, and operates the circulation pump 36, provided that the electromagnetic on-off valve 41 of the air vent that introduces air into the hot water tank 21 is opened to allow air to be introduced into the hot water tank 21.

Then, as shown by the bold line in Figure 1, the hot water in the hot water storage tank 21 and the re-heating circulation passage 34 is supplied by the circulation pump 36, passes through the auxiliary heat source unit 22 and the flow control valve 40a (tank water proportional valve) and flows to the hot water outlet passage 30, and then flows from the hot water outlet passage 30 to the hot water supply passage 32 and is taken out from the hot water tap.
When the temperature of the hot water in the hot water storage tank 21 is low, the auxiliary heat source unit 22 may be operated to heat the hot water appropriately.

Then, when the water outage is no longer detected, when the circulation pump 36 is detected running idly, or when the emergency water extraction mode is released from the operation terminal 24a, the emergency water extraction mode ends and the hot water supply control during a water outage ends. At this time, the control unit 24 closes the electromagnetic opening/closing valve 41 of the air vent of the hot water storage tank 21.

According to the above-mentioned hot water supply control during a water outage, as long as hot water is stored in the hot water storage tank 21, the hot water can be automatically drawn from the hot water tap during a water outage. This is much more convenient than drawing hot water from the hot water storage tank 21 through a drain tap. In addition, it is possible to effectively use the auxiliary heat source unit 22 and supply hot water while heating it with the auxiliary heat source unit 22.

Second Embodiment A hybrid water heater 50 according to a second embodiment will be described with reference to FIG.
This hybrid hot water supply device 50 has a hot water storage tank 51, a heat pump heat source unit 52, a combustion type auxiliary heat source unit 53, a hot water storage pump 54, a circulation pump 55, a water supply passage 56, a circulation forward passage 57, a circulation return passage 58, reheating circulation passages 59, 60, a water supply passage 61, a bypass branch passage 62, a hot water outlet passage 63, a hot water supply passage 64, a mixing valve 65, a control unit 75, an operation terminal 76, and other sensors, valves, etc. The control unit 75 is connected to the sensors, valves, and pumps, and controls these devices.

The hot water tank 51 is provided with temperature sensors 51a-51e, and an air vent with an electromagnetic opening/closing valve 66 is provided at the top of the hot water tank 51. The circulation forward passage 57 connects the bottom of the hot water tank 51 to the heat pump heat source unit 52, and the hot water pump 54 is interposed in the circulation forward passage 57. The circulation return passage 58 connects the heat pump heat source unit 52 to the top of the hot water tank 51 via a three-way valve 67. The circulation forward passage 57 and the circulation return passage 58 are connected via a three-way valve 68 and a bypass passage 69.

The water supply passage 56 is connected to the bottom of the hot water tank 51, and the reheating circulation passage 59 extending from the water supply passage 56 extends to the auxiliary heat source unit 53. The reheating circulation passage 59 is connected to the water supply passage 61 via a three-way valve 59a.

The reheating circulation passage 60 extending from the auxiliary heat source unit 53 extends to the bath heat exchanger, and an electromagnetic opening/closing valve 70 is interposed in this reheating circulation passage 60. A hot water outlet passage 63 extending from the top of the hot water storage tank 51 is connected to a hot water supply passage 64 via a mixing valve 65, and a bypass branch passage 62 branching off from the water supply passage 56 is connected to the mixing valve 65.

An electromagnetic on-off valve 71 is installed in the hot water supply passage 64, and the reheating circulation passage 60 and the hot water outlet passage 63 are connected by a connection passage 73 having a tank water proportional valve 72. A connection passage 74 extends from the circulation return passage 58 through a three-way valve 67, and this connection passage 74 is connected to the hot water outlet passage 63.

Next, a hot water supply control during a water outage will be described, in which hot water in the hot water storage tank 51 is automatically supplied to the hot water tap by the control of the control unit 75 in response to a command from the operation terminal 76 when a water outage occurs.
The flow of hot and cold water at this time is shown by a thick line in Fig. 3. The control program for this hot water supply control during water outage is stored in the control unit 75 in advance.

When a water outage occurs and the water supply pressure drops to near zero, the control unit 75 detects the water outage based on the detection signal from the pressure sensor 56a and transmits the signal to the operation terminal 76. When this water outage is detected, the operation terminal 76 notifies the user. The user then sets the emergency water extraction mode for the control unit 75 from the operation terminal 76 and opens the hot water tap.

When the emergency water extraction mode is set, the controller 75 controls the valves as follows, and then operates the hot water pump 54, provided that the electromagnetic on-off valve 66 of the air vent of the hot water tank 51 is opened to allow air to be introduced into the hot water tank 51.

In controlling the above valves, the three-way valve 68 is switched to conduct in the direction of hot and cold water flow shown by the thick line, the three-way valve 67 is similarly switched to conduct in the direction of hot and cold water flow shown by the thick line, the tank water proportional valve 72 is closed, the solenoid valve 70 is closed, and the solenoid valve 71 is opened.

Then, hot water in the hot water storage tank 51, the circulation forward passage 57, and the circulation return passage 58 is pumped by the hot water storage pump 54, flows through the connecting passage 74 and the hot water outlet passage 30 to the hot water supply passage 32, and is taken out from the hot water tap.
When the temperature of the hot water in the hot water storage tank 51 is low, the heat pump heat source unit 52 may be operated to heat the hot water appropriately.

Then, when the water outage is no longer detected, when the hot water pump 54 is detected running idly, or when the emergency water extraction mode is released from the operation terminal 76, the emergency water extraction mode ends and the hot water supply control during a water outage ends. At this time, the control unit 75 closes the electromagnetic opening/closing valve 66 of the air vent of the hot water tank 51.

According to the above-mentioned hot water supply control during a water outage, as long as hot water is stored in the hot water storage tank 51, the hot water can be automatically drawn from the hot water tap during a water outage. This is much more convenient than drawing hot water from the hot water storage tank 51 through a drain tap. In addition, it is possible to effectively utilize the heat pump heat source unit 52 and supply hot water while heating it with the heat pump heat source unit 52.

Third Embodiment A hybrid water heater 80 according to a third embodiment will be described with reference to FIG.
This hybrid hot water supply device 80 includes a hot water storage tank 81, a heat pump heat source unit 82, a combustion type auxiliary heat source unit 83, a hot water storage pump 84, a circulation pump 85, a water supply passage 86, a circulation forward passage 87, a circulation return passage 88, a bypass passage 89, a three-way valve 90, an auxiliary water supply passage 91 in which the circulation pump 85 is interposed, a bypass branch passage 92, a hot water outlet passage 93, a hot water supply passage 94 having an opening/closing valve 94a, a mixing valve 95, a three-way valve 96 interposed in the circulation return passage 88, a hot water extraction passage 97 extending from the three-way valve 96 and connected to the hot water supply passage 94, a control unit 98, an operation terminal 99, and other sensors, valves, etc. The control unit 98 is connected to the sensors, valves, and pumps, and controls these devices.

The hot water tank 81 is equipped with temperature sensors 81a-81e, and the top of the hot water tank 81 is equipped with an air vent 100 having a manually operated on-off valve. The circulation forward passage 87 connects the bottom of the hot water tank 81 to the heat pump heat source unit 82, and a hot water pump 84 is installed in the circulation forward passage 87. The circulation return passage 88 connects the heat pump heat source unit 82 to the top of the hot water tank 81 via three-way valves 90, 96. The circulation forward passage 87 and the circulation return passage 88 are connected via the three-way valve 90 and a bypass passage 89.

The water supply passage 86 is connected to the bottom of the hot water storage tank 81, and the auxiliary water supply passage 91 extending from this water supply passage 86 extends to the auxiliary heat source unit 83. The hot water extraction passage 97 is connected to the circulation return passage 88 via a three-way valve 96.

A hot water supply passage 94 is connected to a hot water outlet passage 93 extending from the top of the hot water storage tank 81 via a mixing valve 95, and a bypass branch passage 92 branching off from the water supply passage 86 is connected to the mixing valve 95.

Next, a hot water supply control during a water outage will be described, in which hot water in the hot water storage tank 81 is automatically supplied to the hot water tap by the control unit 98 in response to a command from the operation terminal 99 when a water outage occurs.
The flow of hot and cold water at this time is shown by a thick line in Fig. 4. The control program for this hot water supply control during water outage is stored in the control unit 98 in advance.

When a water outage occurs and the water supply pressure drops to near zero, the control unit 98 detects the water outage based on the detection signal from the pressure sensor 86a and transmits the signal to the operation terminal 99. When this water outage is detected, the operation terminal 99 notifies the user. The user then sets the emergency water extraction mode for the control unit 98 from the operation terminal 99 and opens the hot water tap.

When the emergency water extraction mode is set, and the air vent 100 of the hot water tank 81 is opened, the control unit 98 switches the three-way valve 90 to conduct water in the direction shown by the bold line, and switches the three-way valve 96 to conduct water in the direction shown by the bold line, and then operates the hot water pump 84.

Then, the hot water in the hot water storage tank 81, the circulation forward passage 87, and the circulation return passage 88 is pumped by the hot water storage pump 84 and taken out from the hot water tap via the hot water take-out passage 97.
When the temperature of the hot water in the hot water storage tank 81 is low, the heat pump heat source unit 82 may be operated to heat the hot water appropriately.

Then, when the water outage is no longer detected, when the hot water pump 84 is detected running idly, or when the emergency water extraction mode is released from the operation terminal 99, the emergency water extraction mode ends and the hot water supply control during a water outage ends. At this time, the user closes the air vent 100.

According to the above-mentioned hot water supply control during a water outage, as long as hot water is stored in the hot water storage tank 81, the hot water can be automatically drawn from the hot water tap during a water outage. This is much more convenient than drawing hot water from the hot water storage tank 81 through a drain tap. In addition, it is possible to effectively utilize the heat pump heat source unit 82 and supply hot water while heating it with the heat pump heat source unit 82.

It should be noted that the above-mentioned Examples 1, 2, and 3 are merely illustrative, and a person skilled in the art could implement the present invention in a form in which various modifications are made to each part without departing from the spirit of the present invention, and the present invention also encompasses such modified examples.
For example, the air vents in the first and second embodiments may be manually opened and closed, and the air vent in the third embodiment may be opened and closed by an electromagnetic opening and closing valve.

1, 50, 80: Hybrid hot water supply device 9: Hot water tap 10, 52, 82: Heat pump heat source unit 21, 51, 81: Hot water storage tank 22, 53, 83: Auxiliary heat source unit 24, 75, 98: Control unit 24a, 76, 99: Operation terminal 25, 57, 87: Circulation forward passage 26, 58, 88: Circulation return passage 27, 54, 84: Hot water storage pump 36, 55, 85: Circulation pump 41, 66: Solenoid opening and closing valve (air vent)
100: Air vent

Claims (4)

A hybrid hot water supply device including a heat pump heat source unit, a combustion type auxiliary heat source unit, a hot water storage tank, and a control unit,
This hybrid hot water heating device is equipped with an operation terminal for operating the hybrid hot water heating device, and when a water outage is detected, the operation terminal notifies the user, and when an emergency water extraction mode is set to the control unit from the operation terminal, the control unit operates a circulation pump provided in a hot water passage that supplies hot water from the hot water storage tank to an auxiliary heat source unit, provided that an air vent that introduces air into the hot water storage tank is opened, to supply hot water in the hot water storage tank to the hot water tap. A hybrid hot water supply device including a heat pump heat source unit, a combustion type auxiliary heat source unit, a hot water storage tank, and a control unit,
A hybrid hot water supply device comprising an operation terminal for operating the hybrid hot water supply device, which notifies the user from the operation terminal when a water outage is detected, and when an emergency water extraction mode is set to the control unit from the operation terminal, the control unit operates a hot water storage pump provided in a hot water passage that supplies hot water from the hot water storage tank to a heat pump heat source unit, provided that an air vent that introduces air into the hot water storage tank is opened, to supply the hot water in the hot water storage tank to a hot water tap. The hybrid hot water supply device according to claim 1, characterized in that the emergency water extraction mode is terminated when a water outage is no longer detected, when the circulation pump is detected running idly, or when an operation to cancel the emergency water extraction mode is performed from the operation terminal. The hybrid hot water supply device according to claim 2, characterized in that the emergency water extraction mode is terminated when a water outage is no longer detected, when the hot water storage pump is detected running idly, or when an operation to cancel the emergency water extraction mode is performed from the operation terminal.