JP2023048448A - Hybrid hot water supply device - Google Patents

Abstract

To provide a hybrid hot water supply device capable of automatically supplying hot water in a hot water storage tank into a hot water supply plug when water supply is suspended.SOLUTION: A hybrid hot water supply device (50) is equipped with a heat pump heat source machine (52), a combustion type auxiliary heat source machine (53), a hot water storage tank (51), and a control portion (75). The hybrid hot water supply device (50) is equipped with an operation terminal (76) for operating the hybrid hot water supply device (50). When detecting the suspension of water supply, it is notified from the operation terminal (76). When an emergency water takeout mode is set from the operation terminal (76) to the control portion (75), under a condition that an air vent for introducing air is opened in the hot water storage tank (51), the control portion (75) operates a hot water supply pump (54) provided in a hot water passage supplying hot water from the hot water storage tank (51) to a heat pump heat source machine (52), thereby automatically supplying the hot water in the hot water storage tank (51) to a hot water supply plug.SELECTED DRAWING: Figure 3

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hybrid hot water supply apparatus configured to automatically supply hot water from a hot water storage tank to a hot water tap by setting an emergency water take-out mode in a control unit when water supply is interrupted.

In a hybrid water heater comprising a heat pump heat source, a combustion-type auxiliary heat source, a hot water storage tank, and a control unit, when the water supply is cut off, the water supply pressure does not act on the hot water storage tank. cannot supply hot water to the tap. Therefore, hot water is normally taken out from the hot water storage tank through a drain plug for draining water into the container.

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

In the hot water storage type electric water heater described in Patent Document 2, a pump is provided in the bypass pipe that connects the bottom of the hot water storage tank and the hot water outlet pipe, and the pump is operated when the water supply is cut off so that hot water can be taken out from the hot water tap.

The storage-type water heater disclosed in Patent Document 3 is configured such that hot water taken out from the bottom of a hot water storage tank is sent to a heat pump by a hot water storage pump, heated by the heat pump, and then poured directly into a bathtub.

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

SUMMARY OF THE INVENTION An object of the present invention is to provide a hybrid water heater capable of automatically supplying hot water in a hot water storage tank to a hot water tap when the water supply is cut off.

A hybrid water heater according to claim 1 is a hybrid water heater comprising a heat pump heat source, a combustion-type auxiliary heat source, a hot water storage tank, and a control unit. In addition, when a water outage is detected, the operation terminal informs the control unit, and when the emergency water extraction mode is set from the operation terminal to the control unit, the air vent for introducing air into the hot water tank is opened. As a feature, the control unit operates a circulation pump provided in a hot water passage for supplying hot water from the hot water storage tank to the auxiliary heat source device to supply hot water in the hot water storage tank to the hot water supply valve.

According to the above configuration, when the water outage is detected, the operation terminal notifies the user, so that the user can know the water outage at an early stage. When the emergency water extraction mode is set from the operation terminal to the control unit, on condition that the air vent for introducing air into the hot water storage tank is opened, the control unit supplies hot water from the hot water storage tank to the auxiliary heat source machine. is operated to supply 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 taken out from the hot water tap. In this way, the hot water in the hot water storage tank can be taken out from the hot water tap, which is convenient.

It is assumed that the hot water tap is opened when the emergency water extraction mode is set.
Further, when hot water is supplied via the auxiliary heat source machine as described above, hot water may be heated by the auxiliary heat source machine as necessary.

A hybrid water heater according to claim 2 is a hybrid water heater comprising a heat pump heat source, a combustion-type auxiliary heat source, a hot water storage tank, and a control unit. In addition, when a water outage is detected, the operation terminal informs the control unit, and when the emergency water extraction mode is set from the operation terminal to the control unit, the air vent for introducing air into the hot water tank is opened. The control unit operates a hot water storage pump provided in a hot water passage for supplying hot water from the hot water storage tank to the heat pump heat source, thereby supplying the hot water in the hot water storage tank to the hot water tap.

According to the above configuration, when the water outage is detected, the operation terminal notifies the user, so that the user can know the water outage at an early stage. When the emergency water extraction mode is set from the operation terminal to the control unit, on condition that the air vent for introducing air into the hot water storage tank is opened, the control unit controls the hot water storage tank to the heat pump heat source machine. Since a hot water storage pump provided in a hot water passage for supplying hot water is operated to supply hot water in the hot water storage tank to the hot water tap, the hot water in the hot water storage tank can be taken out from the hot water tap. In this way, the hot water in the hot water storage tank can be taken out from the hot water tap, which is convenient.

It is assumed that the hot water tap is opened when the emergency water extraction mode is set.
Further, when hot water is supplied via the heat pump heat source device as described above, hot water may be heated by the heat pump heat source device as necessary.

In the hybrid water heater of claim 3, in the invention of claim 1, when the water supply stop is no longer detected, when the idling of the circulation pump is detected, and when an emergency water extraction mode release operation is performed from the operation terminal. In either case, the emergency water extraction mode is terminated.
According to the above configuration, when the water outage is no longer detected, when the circulating pump is detected to run idle, or when an operation to cancel the emergency water extraction mode is performed from the operation terminal, the emergency water extraction mode is continued. end its emergency water extraction mode because there is no need to

According to the hybrid water heater of claim 4, in the invention of claim 2, when water stoppage is no longer detected, when idling of the hot water storage pump is detected, and when there is an operation to cancel the emergency water extraction mode from the operation terminal. In either case, the emergency water extraction mode is terminated.
According to the above configuration, the same actions and effects as those of claim 3 can be obtained.

The present invention has various functions and effects as described above.

1 is a configuration diagram of a hybrid water heater according to Embodiment 1 of the present invention; FIG. It is a block diagram of a heat pump heat source machine. FIG. 10 is a configuration diagram of a hybrid water heater according to Embodiment 2; FIG. 11 is a configuration diagram of a hybrid water heater according to Embodiment 3;

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated based on drawing.

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

The hot water storage and hot water supply unit 20 includes a hot water storage tank 21 for storing hot water, a combustion-type auxiliary heat source device 22 for heating the hot water using combustion heat of fuel, and a mixing valve 23 for mixing high-temperature hot water and tap water. and a control unit 24 (control means) for controlling the hybrid water heater 1 . The hybrid water heater 1 stores high-temperature hot water in the hot water storage tank 21 by heating the hot water in the hot water storage tank 21 using the heat of the outside air by the heat pump heat source 10, and mixes the high-temperature hot water in the hot water storage tank 21 with the tap water through a mixing valve. The water is mixed at 23 and hot water at a hot water supply set temperature is supplied to, for example, a hot water tap 9 .

The auxiliary heat source device 22 includes a blower fan 22a, a burner 22b, a heat exchanger 22c, and the like, and heats tap water using combustion heat of fuel (for example, city gas) supplied from the outside.

The control unit 24 predicts future use of hot water supply based on the learned and stored hot water supply use history, and performs hot water storage operation so that hot water is stored in the hot water storage tank 21 before the predicted use of hot water supply corresponding to the predicted amount of hot water supply used. to control. In addition to the hot water storage operation and hot water supply operation, the control unit 24 stores a control program for controlling hot water filling operation, reheating operation, etc. based on detection signals from various sensors. Further, the control unit 24 controls the heat pump heat source device 10 based on the temperature of water entering the heat pump heat source device 10 and the outside air temperature.

A circulation passage 25 for supplying hot water from the hot water storage tank 21 to the heat pump heat source device 10 is connected to the lower portion of the hot water storage tank 21, and hot water heated by the heat pump heat source device 10 is supplied to the hot water storage tank 21 at the upper portion of the hot water storage tank 21. A return circulation return path 26 is connected. The circulation forward passage 25 includes a hot water storage pump 27 for sending hot water in the hot water storage tank 21 to the heat pump type heat source device 10 . Note that the heat pump heat source device 10 may include a hot water storage pump 27 .

A circulation going temperature sensor 25 a that detects the temperature of hot water supplied to the heat pump heat source device 10 is arranged in the circulation going passage 25 . A circulation return temperature sensor 26 a that detects the temperature of the hot water heated by the heat pump heat source device 10 is arranged in the circulation return passage 26 .

A water supply passage 28 for supplying clean water to the hot water storage tank 21 from the water supply introduction portion 42 is connected to the lower portion of the hot water storage tank 21 . A pressure gauge 43 for detecting the water pressure of tap water is provided in the water supply introduction section 42 , and the detection signal is supplied to the control section 24 .

A water supply temperature sensor 28a for detecting the temperature of tap water is provided in the water supply passage 28, and a water discharge passage 29 having a drain plug 29a is connected near the connection of the water supply passage 28 with the hot water storage tank 21. there is A hot water discharge passage 30 is connected to the top of the hot water storage tank 21 for discharging the hot water in the hot water storage tank 21 by the water supply pressure of the tap water.

A plurality of stored hot water temperature sensors 21a to 21e are arranged in the hot water storage tank 21 so as to be 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 in the hot water storage tank 21. .
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 outlet temperature sensor 21f for detecting the temperature of the hot water discharged from the hot water storage tank 21 to the hot water outlet passage 30 is arranged near the connecting portion of the hot water outlet passage 30 with the hot water storage tank 21 . The hot water storage tank 21, including the hot water temperature sensors 21a to 21e and the hot water outlet temperature sensor 21f, is covered with a heat insulating member (not shown) to prevent the hot water stored in the hot water storage operation from radiating heat and moderate the temperature drop. .

The mixing valve 23 is connected to a first branch passage 31 branched 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 supply 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 supplied from the hot water tap 9 or the like.

A mixing valve inlet temperature sensor 30 a for detecting the temperature of the hot water supplied to the mixing valve 23 is arranged 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 provided with a hot water supply flow rate sensor 32a for detecting the hot water supply flow rate, a hot water supply temperature sensor 32b for detecting the hot water supply temperature, and a hot water supply flow rate adjustment valve 32c for adjusting the hot water supply flow rate.

A second branch passage 33 is further branched 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 device 22 and the reheating heat exchanger 35, and has a circulation pump 36 on the hot water inlet side of the auxiliary heat source device 22 to supply hot water to the auxiliary heat source device 22. .

Between the outlet of the circulation pump 36 of the reheating circulation passage 34 and the inlet of the auxiliary heat source machine 22, an inlet temperature sensor 34a for detecting the temperature of hot water supplied to the auxiliary heat source machine 22 and a circulation sensor 34a for detecting the flow rate thereof are provided. A flow rate sensor 34b is provided. An outlet temperature sensor 34c for detecting the temperature of the hot water heated by the auxiliary heat source machine 22 is arranged in the reheating circulation passage 34 on the hot water outlet side of the auxiliary heat source machine 22 . Further, the reheating circulation passage 34 has an opening/closing electromagnetic valve 34 d 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 electromagnetic valve 34d.

The reheating heat exchanger 35 is connected to a reheating passage 38 having a bathtub pump 37 for circulating hot water in a bathtub (not shown). The reheating heat exchanger 35 heats hot water in the bathtub flowing through the reheating passage 38 by exchanging heat with the hot water heated by the auxiliary heat source device 22 . The reheating passage 38 is connected to a hot water pouring passage 39 branched from the hot water supply passage 32 at the hot water supply flow rate adjustment valve 32c so that hot water can be poured (filled) into the bathtub through the reheating passage 38. there is
The pouring passage 39 is provided with a pouring water quantity sensor 39a, a pouring electromagnetic valve 39b, and a check valve 39c.

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

The control unit 24 controls devices such as valves and pumps installed in each part based on the temperature detected by temperature sensors such as the hot water storage temperature sensor 21a and the flow rate detected by the hot water supply flow sensor 32a. It is operated to perform various operational controls. In addition, the control unit 24 has a timekeeping function and a function of learning and storing hot water supply usage history. An operation terminal 24a is communicably connected to the control unit 24 . The operation terminal 24a has an operation unit and a display unit for operation of the hot water storage and hot water supply system 1 and various setting operations such as hot water supply set temperature, and a communication unit for communication connection to a domestic communication network (home network). . Even when the commercial power source 2 fails, the home network receives power from a battery (not shown) and maintains communication capability.

The heat pump heat source equipment 10 will be described based on FIG.
The heat pump heat source device 10 is configured by connecting a compressor 11 , a condensation heat exchanger 12 , an expansion valve 13 , and an evaporative heat exchanger 14 with a refrigerant circuit 15 . The heat pump heat source device 10 compresses the refrigerant enclosed in the refrigerant circuit 15 with the compressor 11 to raise the temperature. The hot water in the hot water storage tank 21 supplied from the circulation passage 25 by driving the hot water storage pump 27 is heated by heat exchange with the high-temperature refrigerant in the condensation heat exchanger 12 . The refrigerant, whose temperature has decreased after heat exchange, expands in the expansion valve 13 to become lower in temperature than the outside air, absorbs heat from the outside air in the evaporative heat exchanger 14, and is introduced into the compressor 11 again. The evaporative heat exchanger 14 includes 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 future hot water supply time and hot water consumption based on the hot water supply usage history learned and stored, for example, and controls the hot water storage operation so that hot water storage is completed immediately before the predicted hot water supply usage. At this time, the controller 24 operates the hot water storage pump 27 and the heat pump heat source device 10 to start the hot water storage operation, and ends the hot water storage operation when the amount of heat corresponding to the predicted amount of hot water to be supplied is stored.

Next, the hot water supply operation will be explained.
In the hot water supply operation in which hot water is supplied at the hot water supply set temperature, the control unit 24 adjusts the mixture 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 supply temperature sensor 32b. Hot water adjusted to the set temperature of hot water supply is supplied by this. At this time, the controller 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 the hot water supply operation, the control unit 24 controls the hot water supply time (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 usage time, the hot water supply flow rate, and the hot water storage tank 21 calculated from the mixing ratio of the mixing valve 23. It learns and stores the history of hot water supply usage, including the amount of hot water supplied.

For example, if the stored hot water is used up during the hot water supply operation and there is no hot water of a temperature that can be used for hot water supply in the hot water storage tank 21, the control unit 24 drives the circulation pump 36, and the water supply passage 28 and the reheating A hot water supply operation is performed using high-temperature hot water obtained by heating the clean water supplied from the circulation passage 34 by the auxiliary heat source machine 22.例文帳に追加In addition, for example, when hot water having a higher temperature than the stored hot water is supplied by changing the hot water supply set temperature, the control unit 24 allows the tap water supplied from the water supply passage 28 and the reheating circulation passage 34 to be supplied to the auxiliary heat source machine. The hot water supply operation is performed using the hot water heated at 22.

Next, a description will be given of hot water supply control during water outage, 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 water outage occurs.
A control program for hot water supply control during water outage is stored in the control unit 24 in advance.

When the water supply is interrupted and the water supply pressure drops to near zero, the control unit 24 detects the occurrence of the water supply interruption based on the detection signal from the pressure sensor 43, and transmits it to the operation terminal 24a. When this water outage is detected, the operation terminal 24a notifies the user. Then, the user sets the emergency water take-out mode to the control unit 24 from the operation terminal 24a and opens the hot water tap.

When the emergency water extraction mode is set, the control unit 24 controls the flow rate of The adjustment valve 40a (tank water proportional valve) is opened, the electromagnetic on-off valve 34d is closed, and the circulation pump 36 is operated.

Then, as indicated by the thick line in FIG. 1, the hot water in the hot water storage tank 21 and the reheating circulation passage 34 is supplied by the circulation pump 36, and passes through the auxiliary heat source machine 22 and the flow control valve 40a (tank water proportional valve). Then, the hot water flows into the hot water supply passage 30, flows from the hot water supply passage 30 to the hot water supply passage 32, and is taken out from the hot water supply valve.
Incidentally, when the temperature of the hot water in the hot water storage tank 21 is low, the auxiliary heat source machine 22 may be operated to appropriately heat the hot water.

The emergency water take-out mode ends when the water outage is no longer detected, when idling of the circulation pump 36 is detected, or when the emergency water take-out mode is canceled from the operation terminal 24a. , this hot water supply control during water outage ends. At the end of this process, the controller 24 closes the electromagnetic on-off valve 41 of the air vent of the hot water storage tank 21 .

According to the above-described hot water supply control during water outage, as long as hot water is stored in the hot water storage tank 21, the hot water can be automatically taken out from the hot water tap. This is much more convenient than taking out the hot water in the hot water storage tank 21 from the drain plug. Moreover, the auxiliary heat source machine 22 can be effectively used to supply hot water while heating with the auxiliary heat source machine 22 .

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

The hot water storage tank 51 is provided with temperature sensors 51a to 51e, and the top of the hot water storage tank 51 is provided with an air vent having an electromagnetic on-off valve 66. As shown in FIG. A circulation forward passage 57 connects the bottom of the hot water storage tank 51 to the heat pump heat source device 52 , and a hot water storage pump 54 is interposed in this circulation forward passage 57 . A circulation return passage 58 connects the heat pump heat source 52 to the top of the hot water storage 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 .

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

A reheating circulation passage 60 extending from the auxiliary heat source machine 53 extends to the bath heat exchanger. A hot water supply passage 64 is connected via a mixing valve 65 to the hot water supply passage 63 extending from the top of the hot water storage tank 51 , and a bypass branch passage 62 branched from the water supply passage 56 is connected to the mixing valve 65 .

An electromagnetic on-off valve 71 is interposed in the hot water supply passage 64 , and the reheating circulation passage 60 and 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 the three-way valve 67 and is connected to the hot water discharge passage 63 .

Next, a description will be given of hot water supply control during water outage, in which hot water in the hot water storage tank 51 is automatically supplied to the hot water tap under the control of the control unit 75 in response to a command from the operation terminal 76 when water outage occurs.
It should be noted that the flow of hot water at this time is illustrated by a thick line in FIG. A control program for hot water supply control during water outage is stored in the control unit 75 in advance.

When the water supply is interrupted and the water supply pressure drops to near zero, the control unit 75 detects the occurrence of the water supply interruption based on the detection signal from the pressure sensor 56a and notifies the operation terminal 76 of the detection signal. When this water cutoff is detected, the operation terminal 76 notifies the user. Then, the user sets the emergency water take-out mode to the control unit 75 from the operation terminal 76 and opens the hot water tap.

When the emergency water extraction mode is set, on the condition that the electromagnetic on-off valve 66 of the air vent of the hot water storage tank 51 is opened so that air can be introduced into the hot water storage tank 51, the control unit 75 operates the valve as follows. After controlling the type, the hot water storage pump 54 is operated.

In the control of the above valves, the three-way valve 68 is switched to conduct in the direction of hot water flow indicated by the thick line, and the three-way valve 67 is similarly switched to conduct in the direction of hot water flow indicated by the thick line. The water proportional valve 72 is closed, the electromagnetic on-off valve 70 is closed, and the electromagnetic on-off valve 71 is opened.

Then, the hot water in the hot water storage tank 51, circulation forward passage 57 and circulation return passage 58 is supplied by the hot water storage pump 54, flows into the hot water supply passage 32 through the connection passage 74 and the hot water discharge passage 30, and is taken out from the hot water supply valve.
When the temperature of the hot water in the hot water storage tank 51 is low, the heat pump heat source device 52 may be operated to appropriately heat the hot water.

The emergency water extraction mode is terminated when the water outage is no longer detected, when idle rotation of the hot water storage pump 54 is detected, or when the emergency water extraction mode is canceled from the operation terminal 76. , this hot water supply control during water outage ends. At the end of this operation, the controller 75 closes the electromagnetic on-off valve 66 of the air vent of the hot water storage tank 51 .

According to the above-described hot water supply control during water outage, as long as hot water is stored in the hot water storage tank 51, the hot water can be automatically taken out from the hot water tap. This is much more convenient than taking out the hot water in the hot water storage tank 51 from the drain plug. Moreover, the heat pump heat source device 52 can be effectively used to supply hot water while heating with the heat pump heat source device 52 .

A hybrid water heater 80 according to Embodiment 3 will be described with reference to FIG.
This hybrid water heater 80 includes a hot water storage tank 81, a heat pump heat source 82, a combustion auxiliary heat source 83, a hot water storage pump 84, a circulation pump 85, a water supply passage 86, a circulation forward passage 87, and a circulation return. A passage 88, a bypass passage 89, a three-way valve 90, an auxiliary water supply passage 91 in which a circulation pump 85 is interposed, a bypass branch passage 92, a hot water discharge passage 93, a hot water supply passage 94 having an on-off valve 94a, and a mixing A 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 controller 98, and an operation It has a terminal 99 and other sensors and valves. The control unit 98 is connected to sensors, valves, and pumps, and controls these devices.

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

A water supply passage 86 is connected to the bottom of the hot water storage tank 81 , and an auxiliary water supply passage 91 extending from this water supply passage 86 extends to the auxiliary heat source machine 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 93 extending from the top of the hot water storage tank 81 is connected to a hot water supply passage 94 via a mixing valve 95 , and a bypass branch passage 92 branched from the water supply passage 86 is connected to the mixing valve 95 .

Next, a description will be given of hot water supply control during water interruption, in which hot water in the hot water storage tank 81 is automatically supplied to the hot water tap under the control of the control unit 98 in response to a command from the operation terminal 99 when the water supply is interrupted.
It should be noted that the flow of hot water at this time is illustrated by a thick line in FIG. A control program for hot water supply control during water outage is stored in the control unit 98 in advance.

When the water supply is interrupted and the water supply pressure drops to near zero, the controller 98 detects the occurrence of the water supply interruption based on the detection signal from the pressure sensor 86 a and notifies the operation terminal 99 of the detection signal. When this water cutoff is detected, the operation terminal 99 notifies the user. Then, the user sets the emergency water take-out mode to the control unit 98 from the operation terminal 99 and opens the hot water tap.

On the condition that the air vent 100 of the hot water storage tank 81 is opened when the emergency water extraction mode is set, the control unit 98 switches the three-way valve 90 so as to conduct in the flow direction of the hot water indicated by the thick line. , the three-way valve 96 is switched so as to conduct in the flow direction of the hot water indicated by the thick line, and then the hot water storage pump 84 is operated.

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

The emergency water extraction mode is terminated when the water outage is no longer detected, when the hot water storage pump 84 is detected to run idle, or when the emergency water extraction mode is canceled from the operation terminal 99. , this hot water supply control during water outage ends. At the end of this process, the user closes the air vent 100 .

According to the above-described hot water supply control during water outage, as long as hot water is stored in the hot water storage tank 81, the hot water can be automatically taken out from the hot water tap. This is much more convenient than taking out the hot water in the hot water storage tank 81 from the drain plug. Moreover, it is also possible to effectively use the heat pump heat source device 82 and supply hot water while heating with the heat pump heat source device 82 .

The above-described Embodiments 1, 2, and 3 are examples, and a person skilled in the art can implement them in a form in which various modifications are added to each part without departing from the scope of the present invention. Such modifications are also included.
For example, the air vents of Embodiments 1 and 2 may be manually opened and closed, and the air vent of Embodiment 3 may be opened and closed by an electromagnetic on-off valve.

1, 50, 80: hybrid water heater 9: hot water taps 10, 52, 82: heat pump heat source machines 21, 51, 81: hot water storage tanks 22, 53, 83: auxiliary heat source machines 24, 75, 98: control units 24a, 76 , 99: operation terminals 25, 57, 87: circulation forward passages 26, 58, 88: circulation return passages 27, 54, 84: hot water storage pumps 36, 55, 85: circulation pumps 41, 66: electromagnetic on-off valves (air vents)
100: Air vent

Claims (4)

A hybrid water heater comprising a heat pump heat source, a combustion auxiliary heat source, a hot water storage tank, and a controller,
An operation terminal for operating the hybrid water heater is provided, and when a water outage is detected, the operation terminal notifies the controller, and when an emergency water extraction mode is set from the operation terminal to the control unit, the hot water storage tank is operated. On the condition that the air vent for introducing air into the hot water storage tank is opened, the control unit operates the circulation pump provided in the hot water passage for supplying hot water from the hot water storage tank to the auxiliary heat source machine, thereby discharging the hot water in the hot water storage tank. A hybrid water heater characterized by supplying hot water to a hot water tap. A hybrid water heater comprising a heat pump heat source, a combustion auxiliary heat source, a hot water storage tank, and a controller,
An operation terminal for operating the hybrid water heater is provided, and when a water outage is detected, the operation terminal notifies the controller, and when an emergency water extraction mode is set from the operation terminal to the control unit, the hot water storage tank is operated. On the condition that an air vent for introducing air into the hot water storage tank is opened, the control unit operates a hot water storage pump provided in a hot water passage for supplying hot water from the hot water storage tank to the heat pump heat source machine, thereby causing the hot water in the hot water storage tank to operate. to a hot water tap. Terminate the emergency water extraction mode in any of the following cases: when the water outage is no longer detected, when the idling of the circulation pump is detected, or when an operation for canceling the emergency water extraction mode is performed from the operation terminal. The hybrid water heater according to claim 1, characterized by: To terminate the emergency water extraction mode in any of the following cases: when the water outage is no longer detected, when the hot water storage pump idles, and when an operation for canceling the emergency water extraction mode is performed from the operation terminal. The hybrid water heater according to claim 2, characterized by:

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