JPH11159865A - Single boiler/two water feed pipe water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect presence of a heat medium in a non-hot water supply side circulation path such as reheating circulation path and a circulation flow rate. SOLUTION: When temperature of delivered hot water is almost constant during a single hot water supply operation, a circulation pump 20 is driven. Quantity of a feed back supply gas to a burner prior to driving the circulation pump is defined as the feedback supply gas quantity prior to the driving of the pump, and the feedback supply gas quantity to the burner, after the temperature of delivered hot water reaches a set temperature of supplied water following the driving of the circulation pump, is defined as the feedback gas quantity after the driving of the pump. A reheating circulation path water flow judging section 43 determines that the flow of the hot water does not exist in the reheating circulation path, when a difference between the feedback gas quantity after the driving of the pump and the feedback gas quantity prior to the driving of the pump, is below a reference gas quantity for judging the presence of hot water in the reheating circulation path or judges that the flow exists when the difference is large beyond the reference gas quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single can in which a hot water supply heat exchanger and a non-hot water supply side heat exchanger such as a reheating heat exchanger are integrated, and the integrated heat exchanger is heated by a common burner. It relates to a two-channel water heater.

[0002]

2. Description of the Related Art FIG. 8 shows an example of a system configuration of a one-can, two-channel bath water heater which is an example of a one-can, two-channel water heater developed by the present applicants. In this figure, this one-can two-channel bath water heater (apparatus) has a combustion chamber 1, in which a burner 2 is disposed. Above the burner 2, a hot water supply heat exchanger 3 A reheating heat exchanger 4 as a hot water supply side heat exchanger is provided. The hot water supply heat exchanger 3 and the reheating heat exchanger 4 are disposed integrally. In other words, a hot water supply heat exchanger 3 is formed by penetrating a plurality of common fin plates 5 with a hot water supply-side pipe, and a reheating heat exchanger is similarly mounted by penetrating a fin plate 5 with a refueling-side pipe. The burner 2 heats both the hot water supply heat exchanger 3 and the reheating heat exchanger 4.

The combustion chamber 1 below the burner 2 communicates with an air supply passage 6, and a combustion fan 7 is incorporated in the air supply passage 6. Air is sent to the burner 2 via the burner 6, and exhaust gas generated by combustion of the burner 2 is discharged to the outside from an exhaust passage 9 communicating with the combustion chamber 1 above the burner 2.

[0004] A gas nozzle 19 is provided opposite to the gas inlet of the burner 2, and the gas nozzle 19 is connected to a gas supply passage 8 for introducing a fuel gas.
The fuel gas guided by the gas supply passage 8 is supplied to the burner 2 via a gas nozzle 19. The gas supply passage 8 has solenoid valves 10 and 11 for opening and closing the passage.
a, 11b, and a proportional valve 12 for controlling the gas supply amount based on the valve opening amount.

[0005] A water supply passage 1 is provided on the inlet side of the hot water supply heat exchanger 3.
3 is connected to one end of a hot water supply heat exchanger 3, and one end of a hot water supply passage 14 is connected to the outlet of the hot water supply heat exchanger 3.
Is connected to a water supply source through an external pipe, and the other end of the hot water supply passage 14 is guided to a desired hot water supply place such as a kitchen through the external pipe. The hot water supply heat exchanger 3
A bypass passage 15 for short-circuiting the inlet-side water supply passage 13 and the outlet-side hot water supply passage 14 is provided. The bypass passage 15 is provided with a bypass valve 16 for opening and closing the passage.

A line 1 is provided on the inlet side of the reheater 4.
8 is connected, the other end of the conduit 18 is connected to the discharge port of the circulation pump 20, one end of the return pipe 21 is connected to the suction port of the circulation pump 20, and the return pipe 21
Is connected to the bathtub 22 at the other end. One end of a pipe 23 is connected to the outlet side of the reheater 4, and the other end of the pipe 23 is connected to the bathtub 22. The return pipe 21, the circulation pump 20, the pipe 18, the reheating heat exchanger 4 and the pipe 23 constitute a reheating circulation path 24 as a non-hot water supply side circulation path.

The pipe line 18 of the additional heating circulation passage 24 and the hot water supply passage 14 are communicated by a hot water supply passage 25. The hot water supply passage 25 has a pouring control valve 26 for controlling opening and closing of the passage, and a bathtub. Water level sensor 2 for detecting the water level of 22
8 are provided.

Reference numeral 30 shown in the figure is an air volume sensor for detecting the air volume in the combustion chamber 1, 31 is a water volume sensor provided in the water supply passage 13 for detecting the flow rate of the water supply, and 32
Reference numeral 34 denotes an incoming water temperature sensor for detecting the temperature of water in the water supply passage 13, reference numeral 34 denotes a flow control valve provided in the hot water supply passage 14 to control the flow rate of water, and reference numeral 35 denotes a flow control valve provided in the hot water supply passage 14 to supply hot water. Reference numeral 36 denotes a hot water supply confirmation switch for detecting the presence or absence of water flow, a reference numeral 36 denotes a running water switch for detecting the presence or absence of a water flow in the additional heating circulation passage 24, and reference numeral 37 denotes hot water as a heat medium circulating in the additional heating circulation passage 24. A bath temperature sensor as a non-hot-water supply-side heat medium temperature detecting means for detecting a temperature as a bath water temperature (bath temperature), and a hot water supply temperature 38 for detecting a hot water supply temperature generated by the hot water supply heat exchanger 3. It is a tapping temperature sensor as a detecting means.

[0009] This one-can-two-channel water heater has a control device 4
0 is provided, and the remote controller 4
1 is connected. The remote controller 41 is provided with a hot water supply temperature setting means for setting a hot water supply temperature, a bath temperature setting means for setting a bath temperature of the bathtub 22, a bath water level setting means for setting a water level of hot water in the bathtub 22, and the like. ing.

The control device 40 takes in sensor output signals of various sensors and information of the remote controller 41, and performs various operations such as hot water supply operation, hot water filling operation, reheating operation and the like according to the information and a sequence program given in advance. The operation of the appliance operation is controlled as follows.

For example, when the faucet of the hot water supply passage led to the kitchen or the like is opened, water flows from the water supply source into the water supply passage 13 and the water amount sensor 31 detects the flow of water through the water supply passage 13.
The appliance starts hot water supply operation. First, the rotational drive of the combustion fan 7 is started to open the solenoid valve 10 and / or one or both of the solenoid valves 11a and 11b, thereby supplying fuel gas to the burner 2 through the gas supply passage 8 to a point not shown. The burner 2 is ignited by the ignition means to start combustion.

The proportional valve 12 is controlled so that the hot water temperature becomes the hot water set temperature set in the hot water temperature setting means.
By controlling the valve opening amount (by controlling the amount of gas supplied to the burner 2), the combustion capacity of the burner 2 is controlled, and the hot water supply heat exchanger 3 is controlled.
Is heated by the combustion flame of the burner 2 to produce hot water of a set temperature, and this hot water is supplied to a hot water supply place through a hot water supply passage 14.

When the use of hot water is finished and the faucet is closed,
When the water supply to the hot water supply heat exchanger 3 is stopped and the water amount sensor 31 stops detecting the water supply through the water supply passage 13, the solenoid valve 1
0 is closed to stop the burner 2 from burning. After that, when a predetermined post-purge period (for example, 5 minutes) has elapsed, the rotational drive of the combustion fan 7 is stopped to end the hot water supply operation and prepare for the next hot water supply.

When performing the filling operation, for example, the pouring control valve 26 is opened, and water flows from the water supply source into the water supply passage 13 by the opening operation of the pouring control valve 26, and the water amount sensor 31 supplies water. When the passage of water through the passage 13 is detected, the combustion of the burner 2 is started in the same manner as in the hot water supply operation.

Hot water produced in the hot water supply heat exchanger 3 by the combustion flame of the burner 2 is supplied to the hot water supply passage 14 and the hot water supply passage 2.
5, the hot water which has been sent into the reheating circulation passage 24 through the reheating circulation passage 24 is dropped into the bathtub 22 in two paths, a path passing through the return pipe 21 and a path passing through the reheating heat exchanger 4. It is. When the water level in the bathtub 22 detected by the water level sensor 28 reaches the set water level set in the remote controller 41, the pouring control valve 26 is closed, the solenoid valve 10 is closed, and the combustion of the burner 2 is stopped. Terminate the hot water operation.

When the reheating operation is performed, the circulation pump 20 is driven to circulate the hot water in the bathtub 22 as a heat medium through the reheating circulation passage 24,
After detecting the flow of hot water in the reheating circulation passage 24 by 6, the combustion of the burner 2 is started. Then, the circulating hot and cold water in the reheating heat exchanger 4 is heated by the combustion flame of the burner 2 to perform reheating, and the bath temperature detected by the bath temperature sensor 37 is set to the set temperature set by the bath temperature setting means. When it reaches, the combustion of the burner 2 is stopped, and the reheating operation is ended.

As described above, the one-can-two-channel water heater has a system in which the integrated hot water supply heat exchanger 3 and the reheat-fired heat exchanger 4 are heated using the common burner 2. The system configuration can be simplified as compared with the system in which the provided hot water heat exchanger and the reheater heat exchanger are each heated and burned using separate burners, and as a result, the size and cost of the system can be reduced. I can plan.

FIGS. 9 and 10 show an example of a hot water supply heater as a one-can two-channel water heater. In these figures, the same parts as those of the one-can two-channel bath water heater in FIG. 8 are shown. Have the same reference numerals. In the figure, reference numeral 57 denotes a heating heat exchanger as a non-hot water supply side heat exchanger.
(52a, 52b, 52c) are heating on / off valves,
53 (53a, 53b, 53c) is a radiator, and 54 (54
a, 54b, and 54c) are fans, 55 is a cis-turn tank, and 56 is a bypass passage. As the heat medium circulating in the heating circulation passage 51, for example, a mixture of ethylene glycol and propylene glycol with water is used.

[0019]

By the way, in the one-can, two-channel bath water heater, when the reheating operation is performed, conventionally, as described above, the circulating pump 20 is driven to drive the bathtub 2.
After the hot water in the furnace 2 is circulated through the reheating circulation path 24 and the flow of the hot water is detected by the flowing water switch 36, the combustion of the burner 2 is started. A lot of trash such as hair is contained, and trash such as hair is entangled with the running water switch 36,
Since failure often occurs, there has been a demand to detect the flow of hot and cold water in the reheating circulation passage 24 without using the water switch 36 if possible.

In the above-described one-can-two-water-bath type water heater, for example, the hot water supply and the hot water supply of the bath are reheated based on the heat absorption ratio between the reheating heat exchanger 4 side and the hot water supply heat exchanger 3 side. There is a demand to detect the circulation flow rate of the hot water through the additional heating circulation passage 24 in order to perform the combustion control at the same time as the simultaneous combustion. Although such a sensor has been previously proposed, such a sensor is liable to break down when dust in the bathtub hot water is entangled, similarly to the flow switch 36, and the measured circulating flow rate of the bathtub hot water is an incorrect value. I tended to be.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a one-can two-channel bath capable of accurately detecting the flow of hot and cold water in a reheating circulation path and the circulation flow rate. Another object of the present invention is to provide a water heater and a one-can-two-channel water heater capable of accurately detecting the presence or absence of a flow of a heat medium in a non-hot water supply side circulation passage and a circulating flow rate.

[0022]

In order to achieve the above-mentioned object, the present invention has the following structure to solve the problem. That is, the first invention is a hot water supply heat exchanger that heats water guided from a water supply passage and supplies hot water to the hot water supply passage, and the non-hot water supply side circulation passage that is incorporated in a non-hot water supply side circulation passage provided with a circulation pump. A non-hot water supply side heat exchanger that heats a heat medium circulating through the hot water supply, the hot water supply heat exchanger and the non-hot water supply side heat exchanger are integrated, and the hot water supply heat exchanger and the non-hot water supply side heat exchanger are shared. A hot water supply operation function of supplying hot water produced by the hot water supply heat exchanger through the hot water supply passage, and a non-hot water supply side circulation passage for driving the circulation medium by driving the circulation pump. In a one-can, two-channel water heater having a non-hot water supply side operation function of heating through a hot water supply side heat exchanger, a hot water supply / hot water temperature detection means for detecting a hot water supply water temperature, and the hot water supply / water supply temperature detection means during hot water supply alone operation Temperature and hot water setting temperature When the difference is within a predetermined allowable range and the non-hot water supply side operation instruction is received, the feedback supply gas amount to the burner before the driving of the circulation pump is performed as the feedback gas amount before the pump driving and after the circulation pump driving. The amount of feedback gas supplied to the burner after the temperature detected by the hot water supply / discharge temperature detection means reaches the set hot water supply temperature is set as the post-pump driving feedback gas amount, and the post-pump driving feedback gas amount is used as the pre-pump driving feedback gas. When the difference between the amount of feedback gas after pump driving and the amount of feedback gas before pump driving is less than a predetermined reference gas amount for determining that there is no flow of the heat medium in the non-hot water supply side circulation passage, Judging that there is no flow of heat medium in the circulation passage, the feedback gas amount and the pump It is determined that the difference with the pre-movement feedback gas amount is larger than a predetermined reference gas amount that determines whether there is a flow of the heat medium in the non-hot water supply side circulation passage. The configuration is provided with a non-hot water supply side flow presence / absence determination section as a means for solving the problem.

Further, the second aspect of the present invention is a hot water supply heat exchanger for heating water introduced from a water supply passage and supplying hot water to the hot water supply passage, and a non-hot water supply-side circulation passage provided with a circulation pump. A non-hot water supply side heat exchanger for heating a heat medium circulating in the side circulation passage, wherein the hot water supply heat exchanger and the non-hot water supply side heat exchanger are integrated, and the hot water supply heat exchanger and the non-hot water supply side heat exchange A hot water supply operation function for supplying hot water produced by the hot water supply heat exchanger through a hot water supply passage, and a drive of the circulation pump to circulate the heat medium to the non-hot water supply side are provided. In a one-can two-channel water heater having a non-hot water supply side operation function of heating through a non-hot water supply side heat exchanger in a passage, a hot water supply / hot water temperature detection means for detecting a hot water supply temperature, Temperature detected by temperature detection means and hot water supply A non-hot water supply side flow presence / absence determination mode for detecting the presence / absence of the flow of the heat medium in the non-hot water supply side circulation passage when the difference from the temperature is within a predetermined allowable range; A pump drive control unit for driving the circulation pump in response to a command, and a feedback gas amount fed back to the burner before the circulation pump is driven is set as a feedback gas amount before the pump is driven. The amount of feedback gas supplied to the burner after the detected temperature reaches the hot water supply set temperature is used as the amount of feedback gas after driving the pump, and the amount of feedback gas after driving the pump is compared with the amount of feedback gas before driving the pump. The difference between the gas amount and the feedback gas amount before driving the pump is When it is less than a predetermined reference gas amount, it is determined that there is no flow of the heat medium in the non-hot-water supply side circulation passage, and the difference between the feedback gas amount after the pump is driven and the feedback gas amount before the pump is driven is determined. A configuration in which a non-hot water supply flow presence / absence determination unit that determines that there is a flow of the heat medium in the non-hot water supply side circulation passage when the flow rate is larger than a predetermined reference gas amount that determines that there is a flow of the heat medium in the circulation passage is provided. Is a means for solving the problem.

Further, there is provided a non-hot water supply side operation abnormality judging section for outputting a non-hot water supply side abnormality signal when the non-hot water supply side flow presence / absence judgment section judges that there is no flow of the heat medium in the non-hot water supply side circulation passage. This is also a characteristic configuration of the first and second inventions.

Further, there is provided a non-hot water supply side forced stop means for forcibly stopping the non-hot water supply side operation when the non-hot water supply side abnormality signal is output from the non-hot water supply side abnormality determination section. The first and second aspects of the present invention also include a non-hot-water-supply-side abnormality notification means for notifying a non-hot-water-supply-side operation abnormality when a non-hot-water-supply-side abnormality signal is output from the hot-water-supply-side operation abnormality determination unit. It has a characteristic configuration.

Further, in the third invention, the hot water supply heat exchanger for heating the water introduced from the water supply passage and supplying the hot water to the hot water supply passage and the non-hot water supply side circulation passage provided with a circulation pump are provided. A non-hot water supply side heat exchanger for heating a heat medium circulating in the side circulation passage, wherein the hot water supply heat exchanger and the non-hot water supply side heat exchanger are integrated, and the hot water supply heat exchanger and the non-hot water supply side heat exchange A hot water supply operation function for supplying hot water produced by the hot water supply heat exchanger through a hot water supply passage, and a drive of the circulation pump to circulate the heat medium to the non-hot water supply side are provided. In a one-can, two-channel water heater having a non-hot water supply side operation function of heating through a non-hot water supply side heat exchanger of a passage, a hot water supply / hot water temperature detection means for detecting a hot water supply water temperature, and a heat medium of the non-hot water supply side circulation passage. Non-hot water supply heat medium temperature for detecting temperature The operation is performed when the non-hot water supply side operation instruction is received when the difference between the detected temperature of the hot water supply and hot water temperature detection means and the hot water supply set temperature is within a predetermined allowable range during the hot water supply alone operation. To the burner after the pump driving feedback gas amount, which is the feedback supply gas amount to the burner before driving the circulation pump, and after the circulation pump driving and after the detection temperature of the hot water supply / discharge temperature detection means reaches the hot water supply set temperature. The relationship data between the difference between the feedback supply gas amount after the pump driving, which is the feedback supply gas amount, and the circulation flow rate of the heat medium in the non-hot water supply side circulation passage is given in advance in accordance with the temperature of the heat medium in the non-hot water supply side circulation passage. The amount of feedback gas before driving the pump and the amount of feedback gas after driving the pump are detected, and the detected feedback gas before driving the pump is detected. The heat medium circulation flow rate of the non-hot water supply side circulation passage is detected based on the amount, the feedback gas amount after the pump is driven, the above-mentioned relationship data, and the temperature of the heat medium of the non-hot water supply side circulation passage detected by the non-hot water supply side heat passage temperature detection means. It has a configuration having a circulating flow rate detecting means for solving the problem.

Further, after the non-hot water supply side operation instruction is given, it is first confirmed that the circulation flow rate of the heat medium in the non-hot water supply side circulation passage detected by the circulating flow rate detection means is equal to or higher than a predetermined operating flow rate. A third non-hot water supply lamp operating means for operating the non-hot water supply side combustion lamp and operating the non-hot water supply side until the non-hot water supply side operation is completed is provided.
Of the invention.

Further, the amount of feedback gas after driving the pump is stored in a feedback storage memory, and the amount of feedback gas after driving of the pump stored in the feedback storage memory is cleared after the end of the non-hot water supply side operation. The provision of the clearing means is also a characteristic configuration of the first and third inventions.

Further, the non-hot water supply side circulation passage is a reheating heating circulation passage, the non-hot water supply side heat exchanger is a reheating heating heat exchanger, the heat medium circulating in the reheating heating circulation passage is hot water, and the non-hot water supply side The operation is a reheating operation of the bath, which is also a characteristic configuration of the first, second, and third inventions.

For example, in a one-tank two-channel water heater such as a one-tank two-channel bath water heater, the non-hot-water supply-side heat exchanger of the non-hot-water supply-side circulation passage and the hot-water supply heat exchanger are integrated, so When the heat medium in the non-hot water supply side circulation passage is circulated during operation, the heat medium deprives the hot water of the hot water supply heat exchanger of heat. Therefore, in the present invention having the above configuration, when the hot water supply operation is being performed alone and the difference between the temperature detected by the hot water supply / discharge temperature detection means and the hot water supply set temperature is within a predetermined allowable range, the hot water supply side circulation passage is provided. When the circulating pump is driven, the heat medium in the non-hot water supply side circulation passage deprives the hot water of the hot water supply heat exchanger of heat.

Then, the hot water supply device controls the amount of the feedback supply gas of the burner so as to increase the hot water supply temperature to the hot water supply set temperature, but there is no heat medium in the non-hot water supply side circulation passage, or When there is no flow of the heat medium, the heat amount of the hot water in the hot water supply heat exchanger is not deprived by the heat medium in the non-hot water supply side circulation passage, so that the feedback supply gas amount increase control is not performed.

In the first and second aspects of the present invention, the non-hot-water supply side flow presence / absence determination unit is provided, and the amount of feedback supply gas to the burner before the circulating pump is driven during hot water supply alone operation, Thereafter, based on the difference between the amount of feedback supply gas to the burner after the temperature detected by the hot water supply / discharge temperature detection means reaches the hot water supply set temperature and the predetermined reference gas amount, the heat of the non-hot water supply side circulation passage is determined. In order to determine the presence or absence of the flow of the medium, it is possible to accurately determine the presence or absence of the flow of the heat medium in the non-hot water supply side circulation passage without being affected by dust such as hair in the non-hot water supply side circulation passage such as a reheating circulation passage. And the above-mentioned problem is solved.

In the third aspect of the present invention, the relational data between the difference between the feedback supply gas amount and the circulation flow rate of the heat medium in the non-hot water supply side circulation passage is made to correspond to the temperature of the heat medium in the non-hot water supply side circulation passage. Based on the difference between the relational data and the detected feedback supply gas amount and the temperature of the heat medium in the non-hot water supply side circulation passage detected by the non-hot water supply side heat medium temperature detection means. By detecting the circulating flow rate of the heat medium, the non-hot water supply can be performed without being influenced by dust such as hair in the non-hot water supply side circulation path such as the reheating heating circulation path as in the first and second inventions. This makes it possible to detect the circulation flow rate of the heat medium in the side circulation passage, and the above-mentioned problem is solved.

[0034]

Embodiments of the present invention will be described below with reference to the drawings. In the description of the embodiment, the same reference numerals are given to the same components as those of the water heater of the above proposed example, and the duplicate description thereof will be omitted. The one-can two-channel water heater of this embodiment is a one-can two-channel bath water heater, and has a system configuration almost similar to that of the proposed one-can two-channel water heater of FIG. In the present embodiment, the running water switch 3 provided in the reheating circulation passage 24 in FIG.
6 is omitted to constitute a one-can-two-channel bath water heater system.

FIG. 1 is a block diagram showing a specific control structure of the first embodiment. As shown in the figure, in the present embodiment, the control device 40 includes a pump drive control unit 39, a feedback storage memory 59, a data storage unit 44, a reheating circulation passage water flow determination unit 43, a combustion control unit 42, and a reheating unit. The apparatus includes a forced stop unit 45, a reheating abnormality determination unit 46, and a feedback amount clear unit 58. Further, the remote control 41 is provided with a reheating abnormality notification unit 50.

The combustion control unit 42 is provided with various operation sequence programs such as hot water supply and reheating.
The combustion control unit 42 captures information of the remote controller 41 and sensor outputs of the tap water temperature sensor 38 and the like, and controls the combustion operation of the water heater according to the captured information and a sequence program.

The pump drive control section 39 is operating during the hot water supply alone operation in which the hot water supply apparatus performs only the hot water supply operation without performing the reheating operation as the non-hot water supply side operation. When the difference is within a predetermined allowable range, for example, 2 ° C., the circulating pump 20 is driven when receiving a reheating operation instruction which is a non-hot water supply side operation instruction. The pump drive control unit 39 takes in the control information of the combustion control unit 42, and thereby performs the reheating operation when the hot water supply alone operation is being performed and the difference between the detection temperature of the tap water temperature sensor 38 and the hot water supply set temperature is within the allowable range. When receiving the instruction, the circulating pump 20 is driven. This circulation pump drive signal is applied to the combustion control unit 42 and the reheating circulation passage water flow determination unit 43.

The feedback storage memory 59 stores the amount of feedback gas before pump driving, which is the amount of feedback gas supplied to the burner 2 before the driving of the circulation pump 20 by the pump driving control section 39, and the amount of feedback gas after driving of the circulation pump 20. This is a memory for storing a post-pump driving feedback gas amount that is a feedback supply gas amount to the burner 2 after the detection temperature of the hot water temperature sensor 38 reaches the hot water supply set temperature. The value of the feedback supply gas amount is added from time to time to the feedback storage memory 59 from the combustion control unit 42.
9 before and after the circulation pump 20 is driven, and stored in the feedback storage memory 59.

The data storage section 44 has a predetermined reference gas amount for judging that there is no flow of hot water in the reheating circulation path 24 and a predetermined reference quantity for judging that there is flow of hot water in the reheating circulation path 24. The reference gas amount is stored.
In the present embodiment, both of these reference gas amounts are set to the same value α (α ≒ 0), but these reference gas amounts may be set to different values. The reference gas amount is obtained, for example, by an experiment or the like and given to the data storage unit 44.

That is, in a one-can two-channel water heater,
The hot water supply heat exchanger 3 and the additional heating heat exchanger 4 are integrated, and the hot water circulating in the additional heating circulation passage 24 is controlled by the pump drive control so as to remove heat from the hot water in the hot water supply heat exchanger 3. When the circulating pump 20 is driven by the section 39 when the hot water supply operation is being performed alone and the difference between the detected temperature of the hot water supply temperature sensor 38 and the hot water supply set temperature is within the allowable range, the flow of hot and cold water in the additional heating circulation passage 24 If there is, for example, as shown by a characteristic line a of FIG. 2B, when the hot water supply / outlet temperature fluctuates and there is no hot water or no hot water flow As shown by the characteristic line b in the figure, there is no change in the hot and cold water supply temperature.

Then, in the water heater, the combustion controller 4
2, the amount of the feedback supply gas to the burner 2 is controlled so that the hot water supply hot water temperature becomes the hot water supply set temperature of the remote controller 41. When a change occurs,
As shown by the characteristic line a in FIG. 2A, the gas amount control is performed in a direction to increase the feedback supply gas amount to the burner 2 in order to cancel the change of the hot water supply / outlet temperature. As a result, the amount of gas supplied to the burner 2 increases, and a difference (ΔF / B amount) between the feedback gas amount after pump driving and the feedback gas amount before pump driving occurs.

On the other hand, if there is no hot water or no hot water flows in the reheating circulation passage 24, the circulation pump 2
Since there is no change in the hot water supply / outlet temperature due to the drive of 0, the increase control of the feedback supply gas amount to the burner 2 as described above is not performed, and the supply gas amount to the burner 2 as shown by the characteristic line b in FIG. Is substantially equal before and after the circulation pump 20 is driven.

In FIG. 2A, the feedback gas amount before driving the circulation pump 20 is zero,
The supply gas amount to the burner 2 before the driving of the circulation pump 20 is only the feedback supply gas amount (F / F amount). However, when there is a feedback supply gas amount before the circulation pump 20 is driven, the ΔF / B amount is the feedback gas amount after pump driving (F / _Ba amount) and the feedback gas amount before pump driving (F / B amount). _b amount),
That is, (F / B _a ) − (F / B _b ).

The applicant of the present invention pays attention to the difference in the amount of feedback supply gas to the burner 2 depending on the presence or absence of the water flow in the reheating circulation passage 24, and gives the above-mentioned reference gas amount to the data storage unit 44. The determination of the presence or absence of the water flow in the reheating circulation passage 24 can be made based on the amount.

The recirculation passage water flow judging section 43 compares the feedback gas amount before driving the pump with the feedback gas amount after driving the pump, and determines the difference between the feedback gas amount after driving the pump and the feedback gas amount before driving based on the above-mentioned reference value. When the gas amount is equal to or less than the gas amount, it is determined that there is no flow of hot water in the reheating circulation passage 24, and when the difference between the feedback gas amount after driving the pump and the feedback gas amount before driving is larger than the reference gas amount, the reheating circulation passage is determined. It is determined that there are 24 flows of hot and cold water.

The additional heating circulation passage water flow judging section 43 takes in the temperature detected by the tap water temperature sensor 38 every moment, and the circulation pump 2 added from the pump drive control section 39.
In response to the drive signal of 0, the feedback gas amount before pump driving and the feedback gas amount after pump driving are taken out from the feedback storage memory 59, and the difference between the feedback gas amount after pump driving and the feedback gas amount before pump driving is stored in the data storage unit. Compared with the reference gas amount stored in 44, the presence or absence of the flow of hot water in the reheating circulation passage 24 is determined as described above. The reheating circulation passage water flow determination unit 43 outputs a water flow presence signal when determining that there is a flow in the reheating circulation passage 24, and outputs a no water flow signal when determining that there is no hot water flow in the reheating circulation passage 24. Is output. The water flow presence signal and the water flow absence signal are applied to the reheating abnormality determination unit 46 and the combustion control unit 42.

The feedback amount clearing means 58 clears the post-pump driving feedback gas amount stored in the feedback storage memory 59 after the end of the reheating operation.

When the reheating recirculation passage water flow judging unit 43 judges that there is no hot water flow in the reheating recirculation passage 24, the reheating abnormal judgment unit 46 outputs a reheating abnormal signal as a non-hot water supply side abnormal signal. It functions as a non-hot water supply side abnormal operation abnormality determination unit. The reheating abnormality determination unit 46 receives the no-flow signal from the reheating circulation passage water flow determination unit 43, and adds the reheating abnormal signal to the reheating forced stop unit 45 and the reheating abnormality notification unit 50.

When the reheating abnormality signal is output from the reheating abnormality determining unit 46,
It functions as a non-hot-water supply-side forced stop means for forcibly stopping the reheating operation, which is a non-hot-water supply-side operation. Upon receiving the abnormal signal from the reheating abnormality determination unit 46, the reheating forcible stop unit 45 adds the reheating combustion operation stop signal to the combustion control unit 42 to forcibly stop the reheating operation.

When the reheating abnormality signal is output from the reheating abnormality determining unit 46,
It functions as a non-hot water supply side abnormality notification unit that reports an abnormality in the reheating operation that is the non-hot water supply side operation. The reheating abnormality notification unit 50 receives the reheating abnormality signal added from the reheating abnormality determination unit 46, and notifies the abnormality of the reheating operation by appropriate means such as turning on or blinking a buzzer or a lamp.

The present embodiment is configured as described above, and in this embodiment as well, the hot water supply operation, hot water filling and reheating operation are performed by the control of the control device 40 similarly to the proposed hot water supply device. Will be

In this embodiment, when the reheating alone operation is being performed and the difference between the temperature detected by the tapping water temperature sensor 38 and the set hot water supply temperature set in the remote controller 41 is within the above-mentioned allowable range, FIG. In step 101 of 3, the remote controller 41
When the reheating operation instruction is performed by the operation of the above, in step 102, the pump drive control unit 39 determines whether or not there is a reheating interrupt, and when it is determined that the reheating interrupt has occurred, in step 103, The circulation pump 20 is driven. Then, the reheating recirculation passage water flow determination unit 43 uses the circulation pump 2 by the pump drive control unit 39.
In response to the 0 drive signal, it is determined whether or not the detected temperature of the tap water temperature sensor 38 has reached the set hot water supply temperature after the drive of the circulation pump 20. When the detected temperature of the tap water temperature sensor 38 has reached the set hot water supply temperature, , And proceed to step 105.

In step 105, the re-heating circulation passage water flow judging section 43 judges whether or not hot water flows in the re-heating circulation passage 24. That is, the reheating circulation passage water flow determination unit 43 compares the pre-pump drive feedback gas amount and the post-pump drive feedback gas amount stored in the feedback storage memory 59, and compares the pre-pump drive feedback gas amount and the post-pump drive feedback gas. When the difference from the amount (ΔF / B amount) is equal to or less than the reference gas amount α,
In step 106, it is determined that there is no flow of hot water in the reheating circulation passage 24 (no residual water), and when the ΔF / B amount is larger than the reference gas amount α, it is determined in step 106a that the hot water flows in the reheating circulation passage 24. Judge that there is a flow (there is remaining water).

When it is determined that there is a flow of hot and cold water in the reheating circulation passage 24, the reheating circulation passage water flow determination unit 43 outputs a signal indicating that there is a water flow, adds the signal indicating that there is a water flow to the combustion control unit 42, and controls the combustion control unit 42. Simultaneous combustion control of hot water supply combustion and reheating combustion by the section 42 is performed. Then, in step 107 of FIG. 3, it is determined whether the temperature detected by the bath temperature sensor 37 has reached the bath set temperature and the reheating has been completed. When the reheating has been completed, the circulation pump 20 is turned on in step 108. At the same time, the additional heating signal is added to the feedback amount clearing means, and the feedback clearing means 58 causes the feedback storage memory 59 to stop.
Clears the feedback gas amount after driving the pump stored in.

On the other hand, in step 106b, when the hot water circulation flow rate detecting means 48 determines that there is no flow of hot water in the reheating circulation passage 24, a water flow absence signal is added to the reheating abnormality determination section 46, and the reheating abnormality determination is performed. The unit 46 determines whether the reheating operation is abnormal. Then, in addition to the additional heating forcible stopping means 45 and the additional heating abnormality notifying means 50 by outputting the additional heating abnormality signal by the additional heating abnormality determining unit 46, the additional heating forcible stop means 45 sends the additional heating stop command to the combustion control unit 42. In addition, the reheating operation is forcibly stopped, and the reheating abnormal notification unit 50 performs the reheating abnormal notification.

Incidentally, in the one-can two-channel water heater, the combustion control unit 42 stores in advance data on the relationship between the temperature of the incoming water to the hot water supply heat exchanger 3 and the amount of feedforward supply gas to the burner 2 during the hot water supply alone operation. The combustion control unit 42 controls the feedforward supply gas amount based on the relational data and the temperature detected by the incoming water temperature sensor 32, but the combustion control unit 42 Is also given in relation to the feed water temperature to the burner and the feedforward supply gas amount to the burner 2 at the time of simultaneous combustion of hot water supply and reheating, and there is a flow of hot water in the reheating circulation passage 24 in step 106a of FIG. After the determination is made, the feedforward supply gas amount control is switched to the feedforward supply gas amount control data at the time of the simultaneous combustion described above. It may be.

The difference between the feedforward supply gas amount during the simultaneous combustion and the feedforward supply gas amount during the hot water supply alone combustion may be regarded as the difference between the feedback supply gas amounts (ΔF / B amount). Needless to say, as in the present embodiment, the feedforward supply gas amount is controlled based on the control data at the time of hot water supply alone combustion, and the supply gas amount to the burner 2 at the time of simultaneous combustion is controlled by the feedback supply gas amount control. You may do it.

According to the present embodiment, by the above operation,
In order to determine the presence or absence of hot water flow in the reheating circulation passage 24 based on the difference between the pre-pump driving feedback gas amount and the post-pump driving feedback gas amount and the reference gas amount, for example, Running water switch 3
6 and the like, the presence / absence of water flow in the reheating circulation path 24 is determined differently from the case where the presence / absence of water flow in the reheating circulation path 24 is accurately determined without being influenced by dust such as hair contained in the bath water. can do. Therefore, in this embodiment, it is possible to omit the running water switch 36 conventionally provided in the one-can two-channel water heater, and by omitting the running water switch 36, the system configuration of the water heater can be simplified accordingly. And cost reduction can be achieved.

In this embodiment, since the reheating abnormality determination section 46 is provided, the abnormality of the reheating system is determined based on the presence or absence of the water flow in the reheating circulation path 24 by the reheating circulation path water flow determination section 43. In addition, when the reheating abnormal signal is output from the reheating abnormal determination unit 46, the reheating heat exchanger 4 side is provided to stop the reheating combustion. It is possible to surely prevent the empty firing.

Further, according to the present embodiment, the reheating abnormality notification means 50 is provided, and when the reheating abnormality signal is output from the reheating abnormality determination unit 46, to notify the abnormality of the reheating combustion, The user of the water heater can be notified of an abnormality in the reheating system, such as a lack of a flow of hot water in the reheating circulation passage 24, and call for attention.

Further, in the present embodiment, the feedback clear means 58 is provided, and the feedback storage memory 5 is provided.
In order to clear the feedback gas amount after driving the pump stored in 9 after the end of the reheating operation, the amount of gas supplied to the burner 2 based on the feedforward supply gas amount during the hot water supply operation after the end of the reheating operation. Control can be performed accurately.

FIG. 4 is a block diagram showing a control configuration unique to the second embodiment of the one-can, two-channel water heater according to the present invention. In FIG. 4, the same configuration as that of the first embodiment is shown. The same reference numerals are given to the name portions. The present embodiment is different from the first embodiment in that a hot water circulation flow rate detecting means 48 is provided in place of the additional heating circulation passage water flow determination unit 43 to detect the hot water circulation flow rate of the additional heating circulation passage 24. That is, the configuration is as follows. In the present embodiment, the controller 40 is provided with a reheating lamp operating means 49, and the remote controller 41 is provided with a reheating lamp 47.

The data storage unit 44 stores data on the relationship between the difference between the feedback gas amount before the pump drive and the feedback gas amount after the pump drive and the hot water circulation flow rate in the additional heating circulation passage 24. Is provided in advance in correspondence with

As described above, in the one-can two-channel water heater, the circulating hot water in the reheating circulation passage 24 is supplied to the hot water heat exchanger 3.
When the circulation pump 20 is driven by the pump drive control unit 39 in order to remove heat from the hot water, the temperature change of the hot water supply hot water differs depending on the presence or absence of the flow of hot water in the additional heating circulation passage 24. The temperature change depends not only on the presence / absence of the flow of hot water in the additional heating circulation passage 24, but also on the circulating flow rate of hot water, and further on the temperature of the circulating hot water. Accordingly, the control of increasing the amount of feedback supply gas to the burner 2 controlled to cancel this temperature change also differs depending on the circulation flow rate of the hot and cold water in the additional heating circulation passage 24, and also differs depending on the temperature of the circulating hot water. is there.

For example, in FIG. 5, in a one-can, two-channel bath water heater, the hot water supply operation is being performed alone and the hot water temperature sensor 38 is shown.
When the difference between the detected temperature and the hot water supply set temperature is within a predetermined allowable range, the amount of gas supplied to the burner 2 when the circulating pump 20 is driven is changed by changing the hot water circulation flow rate of the additional heating circulation passage 24. When the temperature of the hot water in the additional heating circulation passage 24 is constant, and when the hot water circulation flow rate in the additional heating circulation passage 24 is large, the amount of gas supplied to the burner 2 varies as shown in FIG. whereas as shown in line a _1, chasing hot water circulation flow rate of the fired circulation passage 24 is the characteristic line a ₁
When less than for the amount of gas supplied to the burner 2 is as indicated by the characteristic line a ₂ in FIG. Note that a characteristic line b indicated by a broken line in the figure indicates the amount of gas supplied to the burner 2 when there is no flow of hot water in the reheating circulation path 24.

As shown by these characteristic lines a ₁ , a ₂ and b, the amount of gas supplied to the burner 2 is
The difference (ΔF / B amount) between the amount of feedback gas after pump drive and the amount of feedback gas before pump drive (ΔF / B amount) is ΔF shown in FIG. / B ₁ and
When the hot water circulation flow rate in the reheating circulation passage 24 is small, ΔF / B _{2 in} the figure is satisfied (ΔF / B ₁ > ΔF / B ₂ ).

On the other hand, even if the hot water circulation flow rate in the additional heating circulation passage 24 is the same, if the hot water temperature in the additional heating circulation passage 24 is different, the hot water in the additional heating circulation passage 24 when the circulation pump 20 is driven is Since the amount of heat absorbed by the hot water supply heat exchanger 3 from which the hot water is removed is different, the change in the hot water supply / outlet temperature is also different, and the burner 2 is performed to eliminate the change in the hot water supply / outlet temperature.
The amount of increase control of the amount of feedback supply gas to the fuel cell is also different.
That is, as the temperature of the hot water in the additional heating circulation passage 24 becomes lower, the amount of heat taken by the circulating hot water in the additional heating circulation passage 24 from the hot water in the hot water supply heat exchanger 3 increases. In other words, the amount of feedback gas supplied to the burner 2 in order to eliminate the change in hot water supply / outlet temperature also increases.

The applicant has determined that the difference between the hot water circulation flow rate and the hot water temperature in the additional heating circulation passage 24 as described above causes the feedback supply gas to the burner 2 to be performed after the pump drive control unit 39 drives the circulation pump 20. Paying attention to the fact that the amount increase control amount is different, the relation data between the ΔF / B amount, which is the difference between the feedback gas amount before the pump drive and the feedback gas amount after the pump drive, and the hot water circulation flow rate in the additional heating circulation passage 24 is added. The temperature is determined in advance by an experiment or the like in accordance with the temperature of hot and cold water circulating in the boil circulation path 24, and is given by, for example, graph data, table data, and calculation data as shown in FIG. Note that in the figure, T ₁ , T ₂ , T
₃ indicates the hot and cold water temperature of the reheating circulation passage 24, and T ₁
<T ₂ <T ₃ .

The hot and cold water circulation flow rate detecting means 48 fetches the detected temperature detected by the hot water temperature sensor 38 and the detected temperature detected by the bath temperature sensor 37 every moment, and the circulation pump 2 added from the pump drive control section 39.
In response to the drive signal of 0, the feedback gas amount before pump drive and the feedback gas amount after pump drive are taken out from the feedback storage memory 59 and detected, and the detected feedback gas amount before pump drive and feedback gas amount after pump drive are detected. And the above-mentioned relation data, and the additional heating circulation passage 2 detected by the bath temperature sensor 38.
Based on the hot water temperature of No. 4, the hot water circulation flow rate of the reheating circulation passage 24 is detected. The detected reheating circulation passage 24
The hot water circulation flow rate is applied to the combustion control unit 42, the reheating lamp operating means 49, and the reheating abnormality determination unit 46.

The reheating lamp operating means 49 determines that the hot water circulation flow rate in the reheating circulation passage 24 detected by the hot water circulation flow detecting means 48 after the reheating instruction is given becomes equal to or greater than a predetermined operating flow rate. Is checked for the first time, the reheating combustion lamp 50 is informed, and this notification operation is operated until the reheating operation is completed.

The reheating lamp operating means 49 is provided with a memory unit (not shown). The memory unit stores the value of the predetermined operating flow rate. Hot water circulation flow rate detecting means 48
Compared with the hot water circulation flow rate of the reheating circulation passage 24 and the working flow stored in the memory unit added from the first time, when it is first confirmed that the hot water circulation flow of the reheating circulation passage 24 is equal to or more than the working flow rate, The reburning combustion lamp 47,
For example, the notification operation is performed by an operation such as lighting. Then, when the reheating operation by the combustion control unit 42 ends, the reheating operation signal is received from the combustion control unit 42, and the notification operation of the reheating combustion lamp 47 is stopped (the reheating combustion lamp 47 is turned off). .

The additional heating abnormality judging section 46 receives the value of the hot water circulation flow rate of the additional heating circulation passage 24 added from the hot water circulation flow detecting means 48, and when the hot water circulation flow rate is 0, that is, the additional heating circulation passage 24, When it is detected that there is no hot water or no flow of hot water, a reheating abnormal signal is output and added to the reheating forced stop means 45 and the reheating abnormal notification means 50.

The structure and operation of the reheating forced forcible stopping means 45 and the reheating abnormal notification means 50 are the same as those in the first embodiment, and the description thereof will be omitted.

The present embodiment is configured as described above, and in this embodiment as well, similarly to the water heater of the proposed example and the water heater of the first embodiment, the hot water supply operation, the filling operation, and the like. Reheating operation is performed.

In the present embodiment, the operation of detecting the hot water circulation flow rate in the additional heating circulation passage 24 is performed according to the flowchart shown in FIG. In FIG. 7, the reheating circulation passage 2 in the first embodiment shown in FIG.
The same operation as the water flow presence / absence determination operation of No. 4 is denoted by the same step number. As shown in FIG. 7, in this embodiment, the same operation as in the first embodiment is performed up to Step 103, and then in Step 104 of FIG. Means 48 determines whether or not the temperature detected by tapping temperature sensor 38 has reached the hot water supply set temperature. Then, when the temperature detected by the tapping temperature sensor 38 reaches the set hot water supply temperature, in step 201, the hot water circulation flow rate detecting means 48 performs a hot water circulation flow rate detection operation of the additional heating circulation passage 24.

This operation is performed, as described above, with the relation data as shown in FIG. 6, for example, the difference between the feedback gas amount before the pump is driven and the feedback gas amount after the pump is driven, and the temperature detected by the bath temperature sensor 37. It is based on. For example, the hot and cold water circulation flow rate detecting means 48 determines the difference (ΔF / B amount) between the detected feedback gas amount before pump driving and the detected feedback gas amount after pump driving as shown in FIG.
And the detected temperature of the bath temperature sensor 37 at this time is T ₁
When the hot water circulation flow rate is detected to be Q _1, when the detected temperature of the bath temperature sensor 37 is T ₂ are, hot water circulation flow rate of reheating circulation passage 24 is detected to be Q _2.

Then, the value of the hot water circulation flow rate of the reheating circulation passage 24 detected by the hot water circulation flow means 48 is added to the combustion control section 42 and the reheating lamp operating means 49, and the reheating lamp operating means 49 When it is first confirmed that the hot water circulation flow rate in the reheating circulation passage 24 has become equal to or higher than the operating flow rate, the reheating combustion lamp 47 is turned on to perform a notification operation.

Next, the operations after step 107 in FIG. 7 are performed in the same manner as in the first embodiment, and in this embodiment, when the reheating operation is completed, the reheating lamp operating means 49 operates. Then, the reheating combustion lamp 47 is turned off, and the notification operation of the reheating combustion lamp 47 is stopped.

According to the present embodiment, by the above operation,
Based on the relation data, the detected feedback gas amount before pump driving, the detected feedback gas amount after pump driving, and the hot and cold water temperature of the reheating circulation passage 24 detected by the bath temperature sensor 37, the Since the hot water circulation flow rate is detected, unlike, for example, a case in which a ball type water volume sensor or the like is directly provided in the reheating heating circulation passage 24, the reheating heating circulation passage 24 is not affected by dust such as hair contained in the bath water. It is possible to accurately detect the hot and cold water circulation flow rate of the hot water circulation passage 24.
The presence or absence of the flow of hot and cold water can also be detected.

Therefore, according to the present embodiment, the same effects as those of the first embodiment can be obtained. Further, the hot water circulation flow rate of the additional heating circulation passage 24 can be accurately detected. Based on the above, the heat absorption ratio between the reheating heat exchanger 4 side and the hot water supply heat exchanger 3 side is obtained, and the combustion control during simultaneous combustion of the reheating and the hot water supply can also be accurately performed.

Further, according to the present embodiment, the hot water circulation flow rate in the reheating circulation path 24 is accurately detected, and when the flow rate reaches a predetermined operation flow rate, the reheating lamp operating means 49 By turning on the reheating combustion lamp 50, the reheating combustion lamp 50 is turned on only when the reheating combustion operation is being performed reliably with the hot water circulation flow rate of the reheating circulation passage 24 at or above the operating flow rate. In addition, it is possible to notify the user of the water heater that the reheating combustion operation is being performed.

The present invention is not limited to the above-described embodiment, but can adopt various embodiments. For example,
In each of the above-described embodiments, the pump drive control unit 39 determines whether the difference between the detection temperature of the hot water supply temperature sensor 38 and the set hot water supply temperature is within a predetermined allowable range during the hot water supply alone operation, and Although the circulation pump 20 was driven when receiving the heating operation instruction, the non-hot-water supply side flow determination such as the additional heating circulation passage water flow presence / absence determination mode for detecting the presence or absence of the flow of hot water in the additional heating circulation passage 24 in the water heater. A mode is provided, and instead of driving the circulation pump 20 when the reheating operation instruction is given, the pump drive control unit 39 receives the operation command of the non-hot water supply side flow presence / absence determination mode,
0 may be driven. As described above, by providing the non-hot-water supply side flow presence / absence determination mode to the water heater, the operation command of the non-hot-water supply side flow presence / absence determination mode is given to the water heater by operating the remote controller 41 or the like during the hot water supply alone operation. It is possible to arbitrarily determine the presence / absence of water flow in the reheating circulation passage 24.

In the above embodiment, when it is determined in step 107 in FIGS. 3 and 5 that the reheating operation has been completed, in step 108, the circulation pump 20 is stopped and the feedback gas However, in the one-can two-channel bath water heater in which the feedforward supply gas amount control is switched from the feedforward supply gas amount control during the hot water supply alone operation to the feedforward supply gas amount control during the simultaneous combustion, The feedforward supply gas amount may be switched from control based on control data during simultaneous combustion to feedforward supply gas amount control during hot water supply alone operation.

Further, in each of the above-described embodiments, the additional heating forced stopping means 45 is provided so that the additional heating operation is forcibly stopped when the additional heating abnormality signal is output from the additional heating abnormality determination unit 46. In addition, a reheating abnormality notification unit 50 is provided to notify the abnormality of the reheating operation when the reheating abnormality signal is output from the reheating abnormality determination unit 46. However, the reheating forcible stopping unit 45 and the reheating abnormality are provided. One or both of the notification means 50 can be omitted.

Further, in each of the above embodiments, the reheating abnormality determining section 46 is provided, and the reheating circulation passage water flow determining section 4 is provided.
When it is determined that there is no hot water in the reheating circulation passage 24 or no flow of hot water by the hot water circulation flow rate detecting means 48 or the hot water circulation flow detecting means 48, the reheating abnormal signal is output. It can be omitted.

Further, in each of the above embodiments, the feedback amount clearing means 58 is provided to clear the feedback gas amount after the pump is driven after the completion of the reheating operation. However, the feedback amount clearing means 58 may be omitted. it can.

Further, in the second embodiment, the reheating lamp operating means 49 is provided, and when it is first confirmed that the hot and cold water circulation flow rate of the reheating heating circulation passage 24 becomes a predetermined operation flow rate abnormality, the reheating lamp is operated. Although the notification operation of the burning combustion lamp 47 is performed to operate the notification operation until the end of the reheating operation, the notification operation of the reheating combustion lamp by the reheating lamp operating means is not limited to the operation described above. Rather, it is set appropriately. Further, the reheating lamp operating means 49 can be omitted.

Further, in the above-described embodiment, the water heater is constituted by providing one of the additional heating circulation passage water flow judging section 45 and the hot water circulation flow rate detecting means 46. However, the water heater can be constituted by providing both of them. Good.

Further, each of the above embodiments has been described with reference to the one-can-two-channel bath water heater shown in FIG. 10, but the one-can-two-channel water heater uses a hot water supply heat exchanger for detecting the hot water temperature of the hot water supply heat exchanger. The present invention can be applied to any one-can-two-channel bath water heater provided with a hot water temperature detecting means and having a hot water supply function and a reheating function.

Further, the present invention is not necessarily applied only to the one-can-two-channel bath water heater as in the above embodiment.
For example, as shown in FIGS. 9 and 10, the heat medium that is incorporated in the hot water supply heat exchanger 3 and the non-hot water supply side circulation passage provided with the circulation pump 20 and circulates in the non-hot water supply side circulation passage is used. It has a non-hot water supply heat exchanger etc. to heat, a hot water supply heat exchanger and a non-hot water supply side heat exchanger are integrated, and a burner is provided to heat the hot water supply heat exchanger and the non-hot water supply side heat exchanger in common. It is widely applied to various one-can-two-channel water heaters having a hot water supply operation function and a non-hot water supply side heat exchanger.

When the present invention is applied to a heating / water heater as shown in FIG. 10, there are the following merits. For example, all the radiators 53a, 53b,
When the heater 53c is not operating, the heating on / off valves 52a, 52b, and 52c are all closed, so that the heat medium flowing through the heating circulation passage 51 flows only through the bypass passage 56. Therefore, the circulation flow rate of the heat medium passing through the heating circulation passage 51 is small. On the other hand, all the radiators 53a, 5
When 3b and 53c are operating, the circulation flow rate of the heat medium passing through the heating circulation passage 51 is the largest. Therefore,
The radiator 53 is not operated when the circulation flow rate of the heating circulation passage 51 is, for example, 5 liters based on the flow rate detected by the non-hot water supply circulating flow rate detection means. It is possible to know the number of radiators 53 that are being operated, such as when the radiators 53 are being operated, or when three 20 liters are used, three radiators 53 are being operated.

Further, since the number of operating radiators 53 is known as described above, the operating capacity of the radiator 53 can be known from the amount of combustion heat and the temperature information of the hot water supply hot water temperature sensor 33. For example, it is possible to know that only one radiator 53 is operated, but its capacity is operating at the maximum fan capacity, or that three radiators 53 are operated, but all three have low fan capacity.

Further, in the hot water supply / heating unit as shown in FIG. 10, the heating on / off valve 52 has a configuration of manually opening and closing and a solenoid on / off valve. Conventionally, which heating on
Because it is not known whether the off valve 52 is open or closed,
For example, a heat medium having a temperature close to the set temperature of the remote controller is always circulated in the circulation passage 51 for heating.

On the other hand, when the present invention is applied to the apparatus shown in FIG. 10, the number of radiators 53 operated can be known, and when all the radiators 53 are not operating, the heat circulated through the heating circulation passage 51 can be obtained. The temperature of the medium is controlled to be lower than the set temperature of the remote controller, and the heating circulation passage 5 is controlled.
When the operation of the radiator 53 is confirmed from the circulation flow of No. 1, the temperature of the heat medium in the heating circulation passage 51 is increased according to the number of operating radiators 53 (circulation flow of the heating circulation passage 51). In this case, it is possible to achieve energy saving as compared with the conventional case where the temperature of the heat medium in the heating circulation passage 51 is controlled to be high regardless of the number of radiators 53 operated. Can be.

[0095] Furthermore, in both hot water heaters and hot water heaters,
Although the length of the piping of the non-hot water supply side circulation passage is not known until after the construction, according to the present invention, the result of detecting the circulation flow rate of the heat medium in the non-hot water supply side circulation passage and the piping of the previously known non-hot water supply side circulation passage The flow velocity of the heat medium calculated from the diameter of
For example, when the speed is 2 m / s or more and it is determined that there is a danger of erosion and corrosion, measures such as reducing the flow rate of the heat medium in the non-hot water supply side circulation passage by reducing the capacity of the circulation pump may be taken. it can.

Further, for example, in a bath water heater,
Even when the circulating metal fittings are clogged, the circulation flow rate of the additional cooking circulation passage changes (decreases), so it is possible to know the status of circulating metal fittings clogging according to the change, and inform the user. Can be.

[0097]

According to the present invention, the circulation pump is driven when the difference between the hot water supply temperature and the hot water supply set temperature is within a predetermined allowable range during the hot water supply alone operation, and the non-hot water supply side circulation passage is driven. In the first and second inventions, based on the feedback gas supply amount increase control to the burner, which is performed to suppress the decrease in the hot water supply temperature caused by the driving of the circulation pump when the heat medium flows, The amount of increase in the supply gas amount (the difference between the feedback gas amount before the pump is driven and the feedback gas amount after the pump is driven) is compared with a predetermined reference gas amount to determine whether or not the heat medium flows in the non-hot water supply side circulation passage. Therefore, even if the heating medium in the non-hot water supply side circulation passage such as the reheating heating circulation passage contains dust such as hair, it is not affected by such dust. It is possible to accurately determine whether the flow of the heat medium of the non-hot-water-supply-side circulation path.

In the third aspect of the invention, similarly to the first and second aspects of the invention, the temperature of the heat medium in the non-hot-water supply-side circulation passage is given in advance based on the increase amount of the feedback supply gas amount. Corresponding data between the corresponding increase in the amount of feedback supply gas and the circulation flow rate of the heat medium in the non-hot water supply side circulation passage, and the detected increase in the feedback supply gas amount and the temperature of the heat medium in the non-hot water supply side circulation passage Since the circulating flow rate of the heat medium in the non-hot-water supply side circulation passage is detected on the basis of the above, it is influenced by dust and the like included in the non-hot-water supply side circulation passage, as in the first and second inventions. Without
It is possible to accurately detect the circulation flow rate of the heat medium in the non-hot water supply side circulation passage. Therefore, according to the third aspect, the presence / absence of the flow of the heat medium in the non-hot water supply side circulation passage can also be accurately detected.

As described above, according to the present invention, in order to be able to accurately detect the presence or absence of the heat medium in the non-hot water supply side circulation passage, a one-can two-channel water heater is conventionally provided in the non-hot water supply side circulation passage. It is also possible to omit means for detecting the presence or absence of the flow of the heat medium, such as a running water switch, so that the system configuration of the water heater can be simplified by that much, and the cost can be reduced.

According to the third aspect of the present invention, since the flow rate of the heat medium circulating in the non-hot water supply side circulation passage can be accurately detected as described above, for example, based on the detected flow rate, It is possible to accurately obtain the heat absorption ratio between the non-hot water supply side heat exchanger side and the hot water supply heat exchanger side, and based on the obtained heat absorption ratio, accurately perform combustion control during simultaneous combustion of non-hot water supply side combustion and hot water supply combustion. Can be done.

Further, a non-hot-water-supply-side operation abnormality judging unit for outputting a non-hot-water-supply-side abnormality signal when the non-hot-water-supply-side flow existence / non-existence judging unit judges that there is no flow of the heat medium in the non-hot-water supply side circulation passage is provided. According to the first and second inventions,
The non-hot-water-supply-side operation abnormality determining unit can accurately determine the non-hot-water-supply-side operation abnormality.

According to the present invention, there is provided a non-hot water supply side forced stop means for forcibly stopping the non-hot water supply side operation when the non-hot water supply side abnormality signal is output from the non-hot water supply side abnormality determination section. For example, when there is no flow of the heat medium in the non-hot-water supply side circulation passage and the non-hot-water supply side operation is determined to be abnormal, the non-hot-water supply side operation is forcibly stopped to prevent the non-hot-water supply side system from being idle. it can.

Further, according to the present invention, there is provided non-hot water supply side abnormality notification means for notifying the non-hot water supply side operation abnormality when the non-hot water supply side abnormality signal is output from the non-hot water supply side abnormality determination section. For example, when the abnormality of the non-hot water supply side operation is determined, the abnormality of the non-hot water supply side operation is notified, so that the user of the water heater can be notified of the abnormality of the non-hot water supply side system and urged to take measures.

Further, after the non-hot water supply side operation instruction is given, it is first confirmed that the circulation flow rate of the heat medium in the non-hot water supply side circulation passage detected by the circulating flow rate detection means is equal to or higher than a predetermined operating flow rate. According to the third aspect of the present invention, the non-hot-water-supply side combustion lamp is provided with a non-hot-water supply-side lamp operating means for operating the non-hot-water supply-side combustion lamp until the non-hot-water supply-side operation is completed. In order to notify the reheating combustion lamp after the circulation flow rate of the non-hot water supply side has been confirmed to be equal to or greater than the operation flow rate, Until the operation is completed, the non-hot water supply lamp is operated to notify the user of the water heater that the non-hot water supply operation is being performed.

Further, the post-pump driving feedback gas amount is stored in a feedback feedback storage memory, and the post-pump driving feedback gas amount stored in the feedback storage memory is cleared after the end of the non-hot water supply side operation. According to the first and third aspects of the present invention having the amount clearing means, after confirming the presence or absence of the flow of the heat medium in the non-hot water supply side circulation passage or the circulation flow rate of the heat medium, the feedback gas amount after driving the pump is reduced. By clearing, the control of the amount of gas supplied to the burner in the next hot water supply alone operation can be performed very smoothly.

Further, the non-hot water supply side circulation passage is a reheating heating circulation passage, the non-hot water supply side heat exchanger is a reheating heating heat exchanger,
According to the present invention, wherein the heat medium circulating in the reheating circulation passage is hot and cold, and the operation on the non-hot water supply side is the reheating operation of the bath, a one-can two-channel water heater with excellent effects as described above is provided. Can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a control configuration of a first embodiment of a one-can two-channel water heater according to the present invention.

FIG. 2 shows a change in hot water supply temperature and a change in supply gas amount to a burner when the circulation pump in the additional heating circulation passage is turned on when the hot water supply temperature is substantially constant during the hot water supply operation alone in the embodiment. Is a graph showing the comparison between the presence and absence of hot and cold water in the additional heating circulation passage.

FIG. 3 is a flowchart illustrating an operation of determining the presence or absence of hot or cold water in a reheating circulation path in the embodiment.

FIG. 4 is a block diagram showing a control configuration of a second embodiment of the one-can two-channel water heater according to the present invention.

FIG. 5 is a flow chart showing a change in the amount of gas supplied to the burner when the circulation pump in the reheating circulation path is driven during the hot water supply operation alone and when the temperature of the hot water supply is substantially constant, in the above-described embodiment. It is a graph shown in comparison by the difference of the hot water circulation flow rate of a passage.

FIG. 6 shows a difference (ΔF / B amount) between a feedback gas amount before the pump drive and a feedback gas amount after the pump drive applied to the one-can two-channel water heater of the second embodiment and the circulation of hot and cold water in the reheating circulation passage. It is a graph which shows the relationship data with a flow rate.

FIG. 7 is a flow chart showing an operation of detecting a hot water circulation flow rate in a reheating steam circulation passage in the second embodiment.

FIG. 8 is a system configuration diagram showing a model example of a one-can-two-channel bath water heater.

FIG. 9 is a system diagram showing a main configuration of a model example of a hot water supply / heating unit that is a one-can two-channel water heater.

FIG. 10 is a system diagram showing a main part configuration of another example of the hot water supply / room heater.

[Explanation of symbols]

 39 Pump drive control unit 42 Combustion control unit 43 Additional heating circulation passage water flow judging unit 44 Data storage unit 45 Additional heating forcible stop unit 46 Additional heating determination unit 48 Hot water circulation flow rate detection unit 49 Additional heating lamp operating unit 50 Additional auxiliary heating notification Means 58 Feedback amount clearing means

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Toshihisa Saito 3-4 Fukamidai, Yamato City, Kanagawa Prefecture Inside Gaster Co., Ltd.

Claims (9)

[Claims] 1. A hot water supply heat exchanger that heats water guided from a water supply passage and supplies hot water to the hot water supply passage, and heat that is incorporated in a non-hot water supply side circulation passage provided with a circulation pump and circulates in the non-hot water supply side circulation passage. A burner having a non-hot-water supply heat exchanger for heating a medium, wherein the hot-water supply heat exchanger and the non-hot-water supply heat exchanger are integrated and commonly heating the hot-water supply heat exchanger and the non-hot-water supply side heat exchanger A hot water supply operation function of supplying hot water produced by the hot water supply heat exchanger through a hot water supply passage, and a non-hot water supply side heat exchange of the non-hot water supply side circulation passage by driving the circulating pump. In a one-can, two-channel water heater having a non-hot water supply side operation function of heating through a water heater, a hot water supply / water temperature detection means for detecting a hot water supply temperature, and a detection temperature of the hot water supply / hot water temperature detection means during hot water supply alone operation. The difference from the hot water set temperature is predetermined The amount of feedback supply gas to the burner before driving the circulation pump performed when the non-hot water supply side operation instruction is received within the allowable range is set as the feedback gas amount before pump driving, and after the circulation pump driving, The amount of feedback gas supplied to the burner after the temperature detected by the hot water supply / discharge temperature detection means reaches the set hot water supply temperature is used as the feedback gas amount after the pump is driven, and the feedback gas amount after the pump is driven is compared with the feedback gas amount before the pump is driven. When the difference between the amount of feedback gas after pump driving and the amount of feedback gas before pump driving is smaller than a predetermined reference gas amount for judging that there is no flow of the heat medium in the non-hot water supply side circulation passage, the heat in the non-hot water supply side circulation passage is Judging that there is no medium flow, the feedback gas amount after pump drive and the feed before pump drive When the difference from the heat gas amount is larger than a predetermined reference gas amount that determines whether there is a flow of the heat medium in the non-hot water supply side circulation passage, it is determined that there is a flow of the heat medium in the non-hot water supply side circulation passage. A one-can-two-channel water heater comprising a side flow presence / absence determination unit. 2. A hot water supply heat exchanger that heats water guided from the water supply passage and supplies hot water to the hot water supply passage, and heat that is incorporated in the non-hot water supply side circulation passage having a circulation pump and circulates in the non-hot water supply side circulation passage. A burner having a non-hot-water supply heat exchanger for heating a medium, wherein the hot-water supply heat exchanger and the non-hot-water supply heat exchanger are integrated and commonly heating the hot-water supply heat exchanger and the non-hot-water supply side heat exchanger A hot water supply operation function of supplying hot water produced by the hot water supply heat exchanger through a hot water supply passage, and a non-hot water supply side heat exchange of the non-hot water supply side circulation passage by driving the circulating pump. In a one-can, two-channel water heater having a non-hot water supply side operation function of heating through a water heater, a hot water supply / water temperature detection means for detecting a hot water supply temperature, and a detection temperature of the hot water supply / hot water temperature detection means during hot water supply alone operation. The difference from the hot water set temperature is predetermined A non-hot-water supply side flow presence / absence determination mode for detecting the presence / absence of the flow of the heat medium in the non-hot-water supply side circulation passage when the flow rate is within the given allowable range. And a pump drive control section for driving the burner, and the feedback gas amount to the burner before the circulation pump is driven is set as the feedback gas amount before the pump drive. The post-pump feedback feedback gas amount is compared with the above-described pre-pump drive feedback gas amount, and the post-pump drive feedback gas amount and the pre-pump drive feedback amount are set as the post-pump drive feedback gas amount. The difference with the gas amount is determined in advance to determine that there is no flow of the heat medium in the non-hot water supply side circulation passage. It is determined that there is no flow of the heat medium in the non-hot water supply-side circulation passage when the reference gas amount is equal to or less than the reference gas amount. A non-hot water supply side flow presence / absence determination unit that determines that there is a flow of the heat medium in the non-hot water supply side circulation passage when the flow rate exceeds a predetermined reference gas amount for determining that there is a flow; Two channel water heater. 3. A non-hot-water supply-side operation abnormality determination unit that outputs a non-hot-water supply-side abnormality signal when the non-hot-water supply-side flow presence / absence determination unit determines that there is no flow of the heat medium in the non-hot-water supply-side circulation passage. The one-can two-channel water heater according to claim 1 or 2, characterized in that: 4. A non-hot water supply side forced stop means for forcibly stopping the non-hot water supply side operation when a non-hot water supply side abnormality signal is output from the non-hot water supply side operation abnormality determination section. The one-can two-channel water heater according to claim 3. 5. A non-hot water supply side abnormality notification means for notifying an abnormality of the non-hot water supply side operation when a non-hot water supply side abnormality signal is output from the non-hot water supply side abnormality determination section. The one-can two-channel water heater according to claim 3 or 4. 6. A hot water supply heat exchanger that heats water guided from the water supply passage and supplies hot water to the hot water supply passage, and heat that is incorporated in the non-hot water supply side circulation passage having a circulation pump and circulates in the non-hot water supply side circulation passage. A burner having a non-hot-water supply heat exchanger for heating a medium, wherein the hot-water supply heat exchanger and the non-hot-water supply heat exchanger are integrated and commonly heating the hot-water supply heat exchanger and the non-hot-water supply side heat exchanger A hot water supply operation function of supplying hot water produced by the hot water supply heat exchanger through a hot water supply passage, and a non-hot water supply side heat exchange of the non-hot water supply side circulation passage by driving the circulating pump. In a one-can two-channel water heater having a non-hot water supply side operation function of heating through a water heater, a hot water supply / water discharge temperature detecting means for detecting a hot water supply temperature and a non-hot water supply side for detecting a temperature of a heat medium in the non-hot water supply side circulation passage. Heat medium temperature detection means and hot water supply independent operation And when the difference between the detected temperature of the hot water supply / discharge temperature detecting means and the set hot water supply temperature is within a predetermined allowable range and when the non-hot water supply side operation instruction is received, before the driving of the circulation pump is performed. The feedback gas amount before the pump operation, which is the amount of feedback supply gas to the burner, and the feedback supply gas amount to the burner after the circulation pump is driven and the temperature detected by the hot water supply / discharge temperature detection means reaches the hot water supply set temperature. Relation data between the difference between the feedback gas amount after driving a certain pump and the circulating flow rate of the heat medium in the non-hot water supply side circulation passage is given in advance in correspondence with the temperature of the heat medium in the non-hot water supply side circulation passage. The pre-feedback gas amount and the post-pump drive feedback gas amount are detected. Circulating flow rate detecting means for detecting the heat medium circulating flow rate in the non-hot water supply-side circulation passage based on the back gas amount, the relational data, and the temperature of the heat medium in the non-hot water supply-side circulation path detected by the non-hot water supply side heat medium temperature detecting means. A one-can, two-channel water heater. 7. After the non-hot water supply side operation instruction is given, it is first confirmed that the circulating flow rate of the heat medium in the non-hot water supply side circulation passage detected by the circulating flow rate detection means is equal to or greater than a predetermined operating flow rate. 7. The one-can two-channel water heater according to claim 6, further comprising a non-hot water supply side lamp operating means for informing the non-hot water supply side combustion lamp and operating the notification operation until the non-hot water supply side operation is completed. . 8. A feedback amount clear for clearing the post-pump driving feedback gas amount stored in the feedback storage memory after the end of the non-hot water supply side operation. The one-can two-channel water heater according to any one of claims 1 or 3 to 7, further comprising means. 9. The non-hot water supply side circulation passage is a reheating heating circulation passage, the non-hot water supply side heat exchanger is a reheating heating heat exchanger, and the heat medium circulating in the reheating heating circulation passage is hot water. The one-can two-channel water heater according to any one of claims 1 to 8, wherein a reheating operation of the bath is performed.