JP2020176811A - Hybrid water heater - Google Patents

Abstract

To provide a hybrid water heater that automatically makes fuel gas confirmation for confirming the necessity of transfer to an emergency operation mode.SOLUTION: A hybrid water heater (1) including a heat pump unit (2), a hot water storage tank (5), an auxiliary heat source machine (4) using fuel gas and control means (7) has a normal operation mode and an emergency operation mode of boiling up hot water in the hot water storage tank by using the heat pump unit while fuel gas cut-off is detected. In the case where a combustion operation using fuel gas has not been performed for a predetermined time or longer in the auxiliary heat source machine (4), the control means (7) makes fuel gas confirmation for confirming the necessity of transfer to the emergency operation mode at predetermined timing associated with stored hot water heat quantity in the hot water storage tank in the normal operation mode.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hybrid hot water supply device, and more particularly to a hybrid hot water supply device that automatically detects a fuel gas cutoff state and shifts to an emergency operation mode.

Conventionally, a hybrid hot water supply device that stores hot water heated by an external heat source machine having high operating efficiency such as a heat pump unit in a hot water storage tank and adjusts the stored hot water to a set temperature for hot water supply has been widely put into practical use. This type of hybrid water heater has a heat pump unit, a hot water storage tank, an auxiliary heat source machine that uses fuel gas, a control means, and the like.
In this hybrid water heater, under normal operating conditions, learning control based on history information of hot water use is used to store hot water corresponding to the hot water load in the hot water storage tank about one hour before the use of hot water. ing.

By the way, when a gas shutoff accident occurs due to an earthquake or a typhoon and the fuel gas is shut off, the auxiliary heat source machine cannot be used, so the normal operation mode is switched to the emergency operation mode, and the power is used in this emergency operation mode. Hot water is stored by operating the heat pump unit.
In the above-mentioned emergency operation mode, in order to store as much heat as possible in the hot water storage tank, an operation is performed in which the hot water storage set temperature is raised and the hot water storage tank is always in a fully stored state, instead of the hot water storage by the learning control described above. ..

In Patent Document 1, when the fuel gas is shut off, the normal operation mode is switched to the emergency operation mode through the operation of the selection determination switch of the remote controller, and only the non-combustion type heat source device (heat pump unit or the like) operated by electric power is used for the hot water storage tank. A technique for performing boiling operation and displaying an emergency operation mode on the display unit of a remote controller is disclosed.

In Patent Document 2, in order to avoid gas leakage determination due to continuous supply of fuel gas, a gas shutoff period is set based on the continuous supply time information of fuel gas, and the required heat amount for the gas shutoff period is previously stored in the tank. The technology for storing hot water is disclosed.

Japanese Patent No. 6209916 Japanese Patent No. 6037640

When the fuel gas is shut off, the user must detect the fuel gas shutoff and switch from the normal operation mode to the emergency operation mode via the operation of the selection decision switch on the remote control as described above. If the user does not understand the function of the emergency operation mode or forgets the function, the operation is not switched to the emergency operation mode and the operation is performed in the normal operation mode.
In that case, if there is a hot water supply load equal to or greater than the predicted amount of heat and an attempt is made to supply hot water by the auxiliary heat source machine, it is noticed that hot water cannot be supplied by the auxiliary heat source machine due to the interruption of fuel gas.

The simplest way to detect the above-mentioned fuel gas shutoff is to check whether the auxiliary heat source machine can be ignited, but the auxiliary heat source machine is frequently ignited without the fuel gas shutoff. As a result, fuel gas is wasted, so it is desirable to check the fuel gas at an appropriate timing.

An object of the present invention is to provide a hybrid hot water supply device that automatically confirms fuel gas for confirming the necessity of shifting to an emergency operation mode.

The hybrid hot water supply device according to claim 1 is a hybrid hot water supply device provided with a heat pump unit, a hot water storage tank, an auxiliary heat source machine using fuel gas, and a control means, and is a heat pump in a normal operation mode and in a state where fuel gas cutoff is detected. The unit is provided with an emergency operation mode in which the hot water in the hot water storage tank is boiled, and the control means is the hot water storage mode in the normal operation mode when the combustion operation using the fuel gas is not performed in the auxiliary heat source machine for a predetermined time or longer. It is characterized by confirming the fuel gas for confirming the necessity of shifting to the emergency operation mode at a predetermined timing related to the amount of heat stored in the tank.

According to the above configuration, when the amount of hot water stored in the hot water storage tank is small, it is desirable to detect the fuel gas shutoff as soon as possible and switch to the emergency operation mode to boil the hot water storage tank. Even if the detection of fuel gas shutoff is delayed to some extent, the hot water supply will not be hindered.
Therefore, by checking the fuel gas to confirm the necessity of shifting to the emergency operation mode at a predetermined timing related to the amount of hot water stored in the hot water storage tank, the fuel gas cutoff is detected at an appropriate timing while suppressing the fuel gas consumption. Then, it is possible to switch to the emergency operation mode.

The hybrid hot water supply device according to claim 2 is characterized in that, in the invention of claim 1, the control means performs the fuel gas confirmation when hot water is used.
According to the above configuration, since the fuel gas is confirmed when the hot water supply is used, the fuel gas shutoff can be detected as early as possible when the hot water supply is used.

The hybrid hot water supply device according to claim 3 is the invention of claim 1 or 2, wherein the control means confirms the fuel gas at the start of the hot water storage operation of the heat pump unit in addition to the predetermined timing in the normal operation mode. It is characterized by doing.
According to the above configuration, the fuel gas is confirmed at the start of the hot water storage operation of the heat pump unit. Therefore, when the fuel gas shutoff is detected, measures such as storing hot water until the hot water storage tank is fully stored are taken at an early stage. be able to.

According to the invention of claim 4, in the invention of any one of claims 1 to 3, the control means confirms the fuel gas for confirming the necessity of shifting to the normal operation mode after shifting to the emergency operation mode. Is performed at least every time hot water is supplied, and when it is detected by the fuel gas confirmation that the fuel gas cutoff has been resolved, the emergency operation mode is automatically switched to the normal operation mode.

According to the above configuration, it is desirable to detect the cancellation of the fuel gas cutoff as soon as possible in the emergency operation mode, but if the fuel gas cutoff is solved by checking the fuel gas at least every time the hot water is used, the hot water is supplied. It is possible to detect the cancellation of fuel gas cutoff without delay from use.
Moreover, when it is detected that the fuel gas cutoff has been resolved, the emergency operation mode is automatically switched to the normal operation mode, so that the normal operation mode can be automatically returned without the user's switch operation.

According to the present invention, various effects can be obtained as described above.

It is a block diagram of the hybrid hot water supply apparatus which concerns on embodiment of this invention. It is a flowchart of hot water storage control which stores hot water based on the hot water storage operation condition set by using the hot water supply use record. This is a part of the operation mode switching control flowchart that switches the operation mode between the normal operation mode and the emergency operation mode by checking the fuel gas in relation to the amount of hot water stored in the hot water storage tank, the use of hot water supply, and the hot water storage operation. It is a part of the flowchart of the above-mentioned operation mode switching control. It is the rest of the flowchart of the above-mentioned operation mode switching control. It is explanatory drawing explaining the hot water storage amount of a hot water storage tank, a flag and a counter. It is explanatory drawing which shows the display example on the display | display of an operation terminal.

Hereinafter, embodiments for carrying out the present invention will be described based on examples.
First, the overall configuration of the hybrid hot water supply device 1 of the present invention will be described with reference to FIG. The hybrid hot water supply device 1 includes a heat pump unit 2 (external heat source machine) and a hot water storage hot water supply unit 3. The hot water storage and hot water supply unit 3 includes a fuel gas combustion type auxiliary heat source machine 4, a hot water storage tank 5 for storing hot water heated by the heat pump unit 2, and a control unit 7 (control means) for controlling the hybrid hot water supply device 1. The control unit 7 predicts the future hot water supply usage based on the learning and memorized hot water supply usage record, and drives the external heat source machine 2 before using the hot water supply for the amount of heat (required heat amount) corresponding to the predicted hot water supply usage amount. The hot water storage operation is controlled so as to store hot water in the hot water storage tank 5.

A hot water discharge passage 11 for discharging hot water stored in the hot water storage tank 5 is connected to the upper part of the hot water storage tank 5. The hot water discharge passage 11 is provided with a hot water temperature sensor 11a for detecting the hot water temperature of the hot water that flows through the hot water passage 11 and is supplied to the hot water mixing valve 12. A water supply passage 13 for supplying clean water from a clean water source to the hot water storage tank 5 is connected to the lower portion of the hot water storage tank 5. A water supply temperature sensor 13a for detecting the water supply temperature is attached to the water supply passage 13.

The water supply bypass passage 14 branches from the water supply passage 13 and is connected to the hot water mixing valve 12. The hot water mixing valve 12 adjusts and mixes the mixing ratio of the hot water in the hot water outlet passage 11 and the clean water in the water supply bypass passage 14 for hot water supply at the hot water supply set temperature. A hot water supply passage 16 is connected to the hot water mixing valve 12, so that hot water supply operation in which hot water mixed by the hot water mixing valve 12 and adjusted to the hot water supply set temperature is supplied from the hot water supply passage 16 to a hot water tap or the like (not shown) is possible. It is configured.

The hot water filling passage 18 branched from the hot water supply passage 16 is connected to the reheating circuit 17, and is configured to enable hot water filling operation in which the hot water mixed by the hot water mixing valve 12 is filled from the reheating circuit 17 to the bathtub 19. ing. A hot water supply temperature sensor 16a for detecting the hot water supply temperature and a hot water supply flow rate sensor 16b for detecting the hot water supply flow rate are arranged in the hot water supply passage 16, and an on-off valve 18a for opening control during the hot water filling operation is arranged in the hot water filling passage 18. It is installed.

A circulation passage 21a for supplying hot water to the heat pump unit 2 is connected to the lower part of the hot water storage tank 5, and a circulation return passage 21b for supplying hot water heated by the heat pump unit 2 to the hot water storage tank 5 is connected to the upper part of the hot water storage tank 5. Therefore, a circulation heating circuit 21 is formed between the hot water storage tank 5 and the heat pump unit 2 so that hot water can be circulated by the circulation pump 22. In the hot water storage operation, the detection temperature of the temperature sensor 21c arranged in the circulation return passage 21b is controlled to be the set target hot water storage temperature by adjusting the rotation speed of the circulation pump 22 and the like.

A plurality of temperature sensors 5a to 5e for detecting the temperature of hot water are arranged on the outer peripheral portion of the hot water storage tank 5 at predetermined intervals in the vertical direction. The temperature sensors 5a to 5e and the hot water storage tank 5 are covered with a heat insulating material (not shown) that reduces heat dissipation of the stored hot water.

The auxiliary heat source machine 4 is an instantaneous water heater that heats hot water by the heat of combustion of fuel gas. When the hot water in the hot water storage tank 5 cannot be supplied by adjusting the hot water supply set temperature, the hot water or clean water in the hot water storage tank 5 is heated by the auxiliary heat source machine 4 and supplied to the hot water mixing valve 12 to adjust to the hot water supply set temperature. Supply hot water.

The auxiliary heating passage 23 for reheating the hot water of the hot water storage tank 5 by the auxiliary heat source machine 4 branches from the hot water outlet passage 11 and is connected to the auxiliary heat source machine 4. The auxiliary hot water passage 24 for discharging the hot water heated by the auxiliary heat source machine 4 is connected to the hot water passage 11 on the downstream side of the branch portion of the auxiliary heating passage 23. The adjusting valve 25 arranged in the auxiliary hot water passage 24 adjusts the amount of hot water supplied from the auxiliary hot water passage 24 to the hot water passage 11. The auxiliary heating passage 23 is provided with a three-way valve 26 and a pump 27 for sending hot water to the auxiliary heat source machine 4.

The heat utilization passage 28 branched from the auxiliary hot water passage 24 is connected to the three-way valve 26. The three-way valve 26 is switched so that the auxiliary heat source machine 4 can be supplied with the hot water of the hot water storage tank 5 or the hot water of the heat utilization passage 28. A heat exchanger 28a and an on-off valve 28b are provided in the heat utilization passage 28. The heat exchanger 28a is used for a reheating operation in which the hot water of the bathtub 19 flowing through the reheating circuit 17 is heated by heat exchange with the hot water heated by the auxiliary heat source machine 4 by the operation of the reheating pump 29. Further, a branch passage portion 13b branched from the water supply passage 13 is connected to the heat utilization passage 28 so that clean water can be supplied to the heat utilization passage 28.

The heat pump unit 2 heats hot water with heat absorbed from the outside air during hot water storage operation and stores the hot water in the hot water storage tank 5. The operating efficiency of the heat pump unit 2 generally improves as the temperature of hot water after heating is lower. The hot water stored in the hot water storage tank 5 by the hot water storage operation is used for hot water supply and filling of the bathtub 19.

The heat pump unit 2 is configured by connecting a compressor 32, a condensing heat exchanger 33, an expansion valve 34, and an evaporation heat exchanger 35 by a refrigerant circuit 36. In the heat pump unit 2, the refrigerant sealed in the refrigerant circuit 36 is compressed by the compressor 32 to a high temperature, and the hot water flowing through the circulation heating circuit 21 is heated by the circulation pump 22 with the high temperature refrigerant in the condensed heat exchanger 33. Heat by replacement. The refrigerant after heat exchange expands by the expansion valve 34 to become lower than the outside air, absorbs heat from the outside air by the evaporation heat exchanger 35, and then is introduced into the compressor 32 again.

The heat of vaporization exchanger 35 includes an outside air temperature sensor 35a for detecting the outside air temperature and a blower 35b. Further, the heat pump unit 2 includes an auxiliary control unit 37 that controls a compressor 32, an expansion valve 34, a blower 35b, and the like. The auxiliary control unit 37 is communicably connected to the control unit 7, which is the main control means of the hybrid hot water supply device 1, and controls the heat pump unit 2 according to the command of the control unit 7.

An operation terminal 8 arranged in the bathroom is connected to the control unit 7 so as to be able to communicate. By operating the operation terminal 8, various operations can be started or ended, and the hot water supply set temperature and the like can be set.

In addition to the control program that controls hot water supply, hot water pouring into the bathtub, reheating of the bath, etc. based on the detection signals of various sensors, the control unit 7 records the hot water supply usage history such as the hot water supply usage amount and the hot water supply usage time. Prediction based on the hot water storage control control program that sets the hot water storage operation conditions including the required hot water storage amount, hot water storage start time, target hot water storage temperature, etc., and the fuel gas confirmation in relation to the hot water storage amount, hot water supply use, and hot water storage operation of the hot water storage tank 5. A flowchart of operation mode switching control for switching the operation mode between the normal operation mode and the emergency operation mode is stored in advance.

First, the hot water storage control will be described with reference to the flowchart of FIG. The reference numerals Si (i = 1, 2, ...) In the figure indicate each step. This hot water storage control is always executed.
In the hot water supply usage history storage control associated with the hot water storage control of FIG. 2, data of the date and time and the amount of hot water supply used is stored in the memory each time the hot water supply is used and accumulated as the hot water supply usage history.

In S1 of the hot water storage control of FIG. 2, the hot water supply usage is predicted based on the past hot water supply usage history, and in S2, the hot water storage including the required hot water storage amount, the hot water supply operation start time, the target hot water storage temperature, etc. is made based on the above hot water supply usage prediction. The operating conditions are set and stored in the memory. The hot water supply operation start time is set to store hot water for the amount of hot water supply used, for example, one hour before the predicted hot water supply usage time.

Next, in S3, it is determined whether or not the mode is the normal operation mode. This normal operation mode is a normal operation mode in which electric power and fuel gas are not cut off, and the normal operation mode is set in the initial setting at the start of the hot water storage control. On the other hand, when the fuel gas is cut off, the auxiliary heat source machine 4 cannot be operated, so that the mode is switched to the emergency operation mode, and the heat pump unit 2 stores hot water by electric power. The operation mode is stored via a flag.

As a result of the determination of S3, if it is in the normal operation mode, it shifts to S4, and if it is not in the normal operation mode, it shifts to S8. In S4, it is determined whether or not it is the hot water storage operation start time in this hot water storage control, and if the determination is Yes, the hot water storage operation is executed in S5, and then it is determined in S6 whether or not the required hot water storage amount is completed, and the determination is made. When is Yes, the hot water storage operation is terminated in S7 and the device returns. If the determination of S4 is No, the process returns, and if the determination of S6 is No, the process proceeds to S5.

In S8, it is determined whether or not it is in the emergency operation mode, and if the determination is Yes, the hot water storage operation is executed in S9, and in the next S10, it is determined whether or not the hot water storage tank 5 is in the full state, and it is not in the full state. In that case, the hot water storage operation is continued by returning to S9, and S9 and S10 are repeated until the state of full storage is reached.
After that, when the hot water storage tank 5 becomes full, it returns. Regarding the target hot water storage temperature for storing hot water in the hot water storage tank 5, the target hot water storage temperature is, for example, 46 to 60 ° C. in the normal operation mode, but in view of the fact that the auxiliary heat source machine 4 cannot be used in the emergency operation mode, the amount of hot water storage is as large as possible. Therefore, the target hot water storage temperature is set to, for example, 65 ° C. Also, in the emergency operation mode, reheating operation of the bath is prohibited.

As described above, in the normal operation mode, the hot water is systematically stored in the hot water storage tank 5 so as not to be late for the timing of hot water supply use based on the prediction of the hot water storage control, but in the emergency operation mode, the auxiliary heat source machine 4 is used. In view of the fact that the hot water tank 5 cannot be used, hot water is always stored so as to fill the hot water storage tank 5.

Next, the operation mode switching control will be described with reference to the flowcharts of FIGS. 3 to 5. In the figure, each step of reference numeral Si (i = 20, 21, ...) Is shown.
Before the explanation of this flowchart, the temperature sensors 5b to 5e provided in the hot water storage tank 5, the flags F1 to F4, and the counters N1 to N4 will be described.

The temperature sensors 5b to 5e actually detect the hot water storage temperature, but when they detect a hot water temperature equal to or higher than the target hot water storage temperature, it becomes "high", and otherwise it becomes "low". Flags F1 to F4 corresponding to temperature sensors 5b to 5e are provided, flags F1 to F4 become "1" when temperature sensors 5b to 5e are "high", and flags F1 when temperature sensors 5b to 5e are "low". ~ F4 becomes "0".

As shown in FIG. 6, the counter N1 indicates the number of times the hot water supply is used when only the temperature sensor 5b is in the “high” state (first stage hot water storage), and the counter N2 shows only the temperature sensors 5b and 5c being “high”. Indicates the number of times hot water is used in the "1st and 2nd stage hot water storage" state, and the counter N3 shows that only the temperature sensors 5b, 5c and 5d are in the "high" state (1st to 3rd stage hot water storage). The counter N4 indicates the number of times the hot water supply is used at that time, and the counter N4 indicates the number of times the hot water supply is used when all of the temperature sensors 5b to 5e are in the "high" state (first to fourth stages of hot water storage).

Next, it will be described based on the flowchart of FIGS. 3 to 5.
When this control is started, various signals necessary for this control are read in S20 and stored in the memory, and then in S21, it is determined whether or not the normal operation mode is in effect. If the determination is No, FIG. It shifts to S39, and when the determination of S21 is Yes, it shifts to S22, and in S22, it is determined whether or not the auxiliary heat source machine 4 is stopped for a predetermined time (for example, 6 hours) or more, and when the determination is Yes, it goes to S23. The transition is made, and when the determination in S22 is No, a return is made.
Next, in S23, it is determined whether or not hot water supply is used. As a result of the determination, if the hot water supply is not used, the process returns to S20. If hot water is used, the process proceeds to S24.

In S24, the flags F1 to F4 are set according to the “high” and “low” of the temperature sensors 5b to 5e. The flag F1 is set to 1 or 0 according to the "high" and "low" of the temperature sensor 5b. Similarly, the flag F2 is set to 1 or 0 according to the "high" and "low" of the temperature sensor 5c, and the flag F3 is set to 1 or 0 according to the "high" and "low" of the temperature sensor 5d. , The flag F4 is set to 1 or 0 according to the "high" and "low" of the temperature sensor 5e.

In S25 following S24, the counters N1 to N4 are set according to the flags F1 to F4. First, when the flags F1 to F4 are 0, the counters N1 to N4 corresponding to the flags are reset to 0, respectively.
Next, if the flag F1 is 1 and the flags F2, F3, and F4 are 0, the counter N1 is incremented by "1". If the flags F1 and F2 are 1 and the flags F3 and F4 are 0, the counter N2 is incremented by "1". If the flags F1, F2 and F3 are 1 and the flag F4 is 0, the counter N3 is incremented by "1". If the flags F1, F2, F3, and F4 are 1, the counter N4 is incremented by "1".

Next, in S26 of FIG. 4, it is determined whether or not the counter N1 is 2 or more, and if the determination is Yes, the counter N1 is reset to 0 in S27 before shifting to S35.
When the determination in S26 is No, it is determined in S28 whether or not the counter N2 is 3 or more, and when the determination is Yes, the counter N2 is reset to 0 in S29 before proceeding to S35. When the determination in S28 is No, it is determined in S30 whether or not the counter N3 is 4 or more, and when the determination is Yes, the counter N3 is reset to 0 in S31 and then the process proceeds to S35. When the determination in S30 is No, it is determined in S32 whether or not the counter N4 is 5 or more, and when the determination is Yes, the counter N4 is reset to 0 in S33 and then the process proceeds to S35.

When the determination of S32 is No, it is determined in S34 whether or not the hot water storage operation performed in the hot water storage control has been started. When the determination is Yes, the process proceeds to S35, and when the determination of S34 is No, the process proceeds to S38. To do.
In S35, the fuel gas is confirmed to confirm the necessity of shifting to the emergency operation mode. This fuel gas confirmation is performed by igniting the auxiliary heat source machine 4 a plurality of times and confirming the generation of flame with the frame rod.
Next, in S36, it is determined whether or not the fuel gas is shut off based on the presence or absence of flame generation, and if the determination is Yes, the operation mode is switched to the emergency operation mode in S37, and then the process proceeds to S39 in FIG. When the determination in S36 is No, the process proceeds to S38, and the operation mode is set to the normal operation mode in S38 before returning.

Next, in S39 of FIG. 5, it is determined whether or not hot water supply is used, and when the determination is Yes, fuel gas confirmation is performed in S40 in the same manner as described above. In S41 following S40, it is determined whether or not the fuel gas cutoff has been resolved, and if the determination is Yes (fuel gas cutoff resolved), in S42, the operation mode is switched to the normal operation mode before returning.

When the determination in S39 is No, the process proceeds to S43, in S43 it is determined whether or not the display of the number of stages of the amount of hot water stored in the hot water storage tank 5 is switched, when the determination is No, a return is made, and when the determination in S43 is Yes, S44 Move to.
FIG. 7 shows a display example of the display 8a of the operation terminal 8, and this display example shows the number of hot water storage stages 8b of the hot water storage tank 5, the presence / absence of [emergency operation] (8c), the hot water supply set temperature 8d, and the like. Has been done.

Even when hot water is not used, when the hot water storage operation is started by hot water storage control, the amount of hot water stored in the hot water storage tank 5 changes, so the "high" and "low" states of the temperature sensors 5b to 5e change, and the amount of hot water stored. The number of stages display is switched. Further, even when the hot water storage tank 5 is in a full storage state, or when the hot water storage amount in the hot water storage tank 5 is exhausted and the hot water is exhausted, the display of the number of stages of the hot water storage amount is switched, so that the process proceeds to S44.
When the display of the number of stages of the hot water storage amount is switched, the fuel gas confirmation is performed in the same manner as described above in S44, and it is determined in the next S45 whether or not the fuel gas cutoff is canceled. If the determination is Yes, the operation mode is normal operation. The mode is switched, and when the determination in S45 is No, the mode is returned.

Next, the operation and effect of the hybrid hot water supply device 1 described above will be described.
When the amount of hot water stored in the hot water storage tank 5 is small, it is desirable to detect the fuel gas shutoff as soon as possible and switch to the emergency operation mode to boil the hot water storage tank 5, and when the amount of hot water stored is large, the fuel gas shutoff is detected. Even if there is a slight delay, the hot water supply will not be hindered.

Therefore, as shown in S26 to S35, in the state where only the hot water is stored in the first stage, the fuel gas is confirmed every time the use of hot water is detected, for example, twice in view of the small amount of hot water stored. In the state where the hot water is stored in the first stage and the second stage, the fuel gas is checked every time the use of hot water is detected three times, for example. In the state where the hot water is stored in the first stage, the second stage, and the third stage, the fuel gas is checked every time the use of hot water is detected, for example, four times. In a state where hot water is stored (full state) from the first stage to the fourth stage, the fuel gas is checked every time the use of hot water is detected, for example, five times. Note that "2", "3", "4", and "5" in S25, S27, S29, and S31 indicate an example and are not limited to these numerical values.

In this way, by confirming the fuel gas for confirming the necessity of shifting to the emergency operation mode at a predetermined timing related to the amount of hot water stored in the hot water storage tank 5, it is appropriate to shut off the fuel gas while suppressing the fuel gas consumption. It can be detected at the timing and switched to the emergency operation mode.

Since the fuel gas is confirmed at the timing of hot water supply use, it is possible to detect the fuel gas shutoff as soon as possible when the hot water supply is used and the amount of hot water stored fluctuates.

As shown in S34 and S35, the fuel gas is confirmed at the timing when the heat pump unit 2 starts the hot water storage operation. Therefore, when the fuel gas shutoff is detected, measures such as storing hot water until the hot water storage tank is fully stored are taken. Can be taken early.

It is desirable to detect the cancellation of the fuel gas cutoff as soon as possible in the emergency operation mode, but as shown in S37 and S40, when the fuel gas cutoff is solved by checking the fuel gas at least every time the hot water is used. It is possible to detect the cancellation of the fuel gas cutoff without delay from the use of hot water supply.
Moreover, when it is detected that the fuel gas cutoff has been resolved, the emergency operation mode is automatically switched to the normal operation mode, so that the normal operation mode can be automatically returned without the user's switch operation.

As shown in S35 to S37, when the fuel gas shutoff is detected, the normal operation mode is automatically switched to the emergency operation mode, and as shown in S40 to S42 and S44 to S46, the cancellation of the fuel gas shutoff is detected. When it occurs, it automatically shifts from the emergency operation mode to the normal operation mode, so it automatically shifts from the normal operation mode to the emergency operation mode and from the emergency operation mode to the normal operation mode without the need for a user switch operation. , The operation mode can be switched easily, efficiently and surely.

As shown in S39 to S41, by checking the fuel gas every time the hot water is used, it is possible to check the fuel gas as soon as possible after using the hot water, and it is possible to prevent the return to the normal operation mode from being delayed. ..
As shown in S43 to S45, in the emergency operation mode, by checking the fuel gas each time the display of the number of stages of the hot water storage amount is switched, it is possible to check the fuel gas at appropriate time intervals in relation to the hot water storage amount.
The equipment of the auxiliary heat source machine 4 can be effectively used to confirm the combustion and automatically confirm the fuel gas.

Next, an example of partially modifying the embodiment will be described.
1) The fuel gas may be confirmed before the set time (for example, 4 hours) of the scheduled pouring time for pouring the hot water into the bath. This is to store hot water in advance when the fuel gas is shut off.
2) In addition, a person skilled in the art can carry out the embodiment by adding various modifications to the embodiment without departing from the spirit of the present invention.

1 Hybrid water heater 2 Heat pump unit 3 Hot water storage unit 4 Auxiliary heat source machine 5 Hot water storage tank 7 Control unit (control means)
8 Operation terminal

Claims (4)

In a hybrid hot water supply device equipped with a heat pump unit, a hot water storage tank, an auxiliary heat source machine that uses fuel gas, and a control means.
It has a normal operation mode and an emergency operation mode in which the hot water in the hot water storage tank is boiled by the heat pump unit when the fuel gas cutoff is detected.
The control means shifts to the emergency operation mode at a predetermined timing associated with the amount of heat stored in the hot water storage tank in the normal operation mode when the combustion operation using the fuel gas is not performed in the auxiliary heat source machine for a predetermined time or longer. A hybrid hot water supply device characterized by checking fuel gas for confirmation of necessity. The hybrid hot water supply device according to claim 1, wherein the control means confirms the fuel gas when hot water is used. The hybrid hot water supply device according to claim 1 or 2, wherein the control means performs the fuel gas confirmation at the start of the hot water storage operation of the heat pump unit in addition to the predetermined timing in the normal operation mode. After shifting to the emergency operation mode, the control means checks the fuel gas to confirm the necessity of shifting to the normal operation mode at least every time hot water is used, and detects that the fuel gas cutoff has been resolved by this fuel gas check. The hybrid hot water supply device according to any one of claims 1 to 3, wherein the emergency operation mode is automatically switched to the normal operation mode when the operation is performed.