JPH11101503A - One boiler two water passage water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe one boiler two water passage water heater that can avoid the danger of low water on the side of a reheating heat exchanger in a reheating operation. SOLUTION: The one boiler two water passage water heater is provided with a hot water temperature sensor 33 for hot water supply heat exchange for detecting hot water temperature in a hot water supply heat exchanger. A burner combustion operation is started immediately driving a circulation pump by reheating combustion forced starting means 16 and without detecting the flow of the hot water in the reheating circulation circuit when a remote control 41 issues a reheating combustion command reheating sole operation combustion control part 45 stops combustion of a burner while the hot water temperature of hot water supply heat exchanger is detected to be not lower than an off temperature by the hot water temperature sensor 33 of a hot water supply heat exchange and restarts the burner combustion when it is detected to be not higher than the off temperature. The combustion of the burner is stopped immediately when the hot water temperature of the hot water supply heat exchanger rose abruptly caused by the shortage of hot water in a reheating circulation passage and combustion without water on the side of the reheating heat exchanger is prevented.

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. 3 shows an example of a system configuration of a one-can-two-channel bath water heater as a one-can-two-channel water heater developed by the 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 which is 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. A hot water supply confirmation switch for detecting the presence or absence of a water flow in the additional heating circulation passage 24, and a hot water supply switch 37 for detecting the presence or absence of a water flow in the additional heating circulation passage 24. A bath temperature sensor detects the temperature of the hot water produced by the hot water supply heat exchanger 3.

[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 water in the bathtub 22 through the reheating circulation passage 24, and after the flow of the water in the reheating circulation passage 24 is detected by the flowing water switch 36, 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.

[0018]

By the way, in the conventional one-can, two-channel bath water heater, as described above, when the reheating operation is performed, the flow of hot and cold water in the reheating circulation passage 24 caused by the driving of the circulation pump 20. The running water switch 3
6, the combustion of the burner 2 is started. However, since the bathtub hot water that has entered the reburning circulation passage 24 from the bathtub 22 contains dust such as hair, the dust is clogged in the running water switch 36. Even though there is no bath water in the reheating circulation passage 24 due to the dust clogging, or there is no flow of hot water, a flowing water detection signal is output from the flowing water switch 36, and the burner combustion is performed in response to the flowing water detection signal. Is performed, and there is a problem that an empty boil is generated.

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 reheating type heat exchanger having a reheating type heat exchanger which detects a flow of hot water in a reheating recirculation passage. Provide a one-can two-canal bath water heater that can prevent empty heating, and furthermore, a non-hot-water-side heat exchanger is provided in addition to the one-can two-canal bath water heater. Similarly, in a one-can two-channel water heater that heats both heat exchangers with a common burner, the one-can two-can water heater can similarly prevent the non-hot water supply side heat exchanger side from being idlely heated due to a malfunction of a running water switch or the like. It is to provide a channel water heater.

[0020]

In order to achieve the above object, the present invention provides means for solving the problem with the following constitution. 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. In a one-can two-channel water heater provided with a burner for heating, a hot water supply heat exchanger hot water temperature detecting means for detecting the hot water temperature of the hot water supply heat exchanger is provided, and only the operation on the non-hot water supply side is performed without performing hot water supply. If the hot water temperature of the hot water supply heat exchanger detected by the hot water supply heat exchanger hot water temperature detecting means during the non-hot water supply side alone operation becomes equal to or higher than the set temperature for stopping the burner combustion, the burner combustion is stopped. The temperature of the hot water in the exchanger is set to restart burner combustion. A non-hot-water-supply-side independent operation combustion control unit that restarts combustion of the burner when the temperature falls below the temperature; A non-hot water supply forced combustion start means for immediately starting the burner combustion operation without detecting the flow of air is provided as means for solving the problem.

The second aspect of the present invention provides 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 circulation circuit provided with a circulating 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 In a one-can two-channel water heater provided with a burner for heating the water heater in common, a hot water supply heat exchanger hot water temperature detecting means for detecting the hot water temperature of the hot water supply heat exchanger is provided, and the hot water supply is not performed and the operation on the non-hot water supply side When the hot water temperature of the hot water supply heat exchanger detected by the hot water supply heat exchanger hot water temperature detection means becomes higher than the set temperature at which the burner combustion performance is reduced during the non-hot water supply side alone operation in which the burner combustion performance is reduced, the burner combustion performance is reduced. And the hot water temperature of the hot water supply heat exchanger A non-hot water supply-side independent operation combustion control unit for increasing the combustion capacity of the burner when the temperature becomes equal to or lower than a set temperature at which the capacity is increased; and a non-hot water supply while driving the circulating pump when a non-hot water supply operation instruction is given. This is a means for solving the problem with a configuration in which a non-hot water supply combustion forced start means for immediately starting the burner combustion operation without detecting the flow of the heat medium in the side circulation passage is provided.

Further, the third invention provides a hot water supply heat exchanger for heating water introduced from the water supply passage and supplying hot water to the hot water supply passage, and a reheating system provided with a recirculation pump having a circulation pump. It has a reheating heat exchanger that heats the hot and cold water circulating in the circulation passage, and the hot water supply heat exchanger and the reheating heat exchanger are integrated to heat the hot water supply heat exchanger and the reheating heat exchanger in common. A hot water supply function for supplying hot water produced by the hot water supply heat exchanger through a hot water supply passage, and a hot water supply bath for heating a bath tub through a reheating heat exchanger of the reheating heating circulation passage to reheat a bath. In a one-can two-channel water heater having a heating function, a hot-water supply heat exchanger hot-water temperature detecting means for detecting the hot-water temperature of the hot-water supply heat exchanger is provided, and the hot-water supply is performed only during the reheating operation in which only the reheating is performed without the hot water being supplied. Heat exchanger When the hot water temperature of the hot water supply heat exchanger detected by the above becomes equal to or higher than the set temperature for stopping the burner combustion, the combustion of the burner is stopped, and the hot water temperature of the hot water supply heat exchanger becomes equal to or lower than the set temperature for restarting the burner combustion. When the reheating operation is performed, the recirculation pump is driven when the reheating instruction is given, and the burner combustion operation is performed without detecting the flow of hot or cold water in the reheating recirculation passage. This is a means for solving the problem with a configuration in which reburning combustion forced start means for immediately starting the combustion is provided.

Further, in the fourth invention, a hot water supply heat exchanger for heating water introduced from the water supply passage and supplying hot water to the hot water supply passage, and a reheating circulating passage provided with a circulation pump are provided. It has a reheating heat exchanger that heats the hot and cold water circulating in the circulation passage, and the hot water supply heat exchanger and the reheating heat exchanger are integrated to heat the hot water supply heat exchanger and the reheating heat exchanger in common. A hot water supply function for supplying hot water produced by the hot water supply heat exchanger through a hot water supply passage, and a hot water supply bath for heating a bath tub through a reheating heat exchanger of the reheating heating circulation passage to reheat a bath. In a one-can two-channel water heater having a heating function, a hot-water supply heat exchanger hot-water temperature detecting means for detecting the hot-water temperature of the hot-water supply heat exchanger is provided, and the hot-water supply is performed only during the reheating operation in which only the reheating is performed without the hot water being supplied. Heat exchanger When the hot water temperature of the hot water supply heat exchanger detected by the above becomes equal to or higher than the set temperature at which the burner combustion performance is reduced, the burner performance is reduced, and the hot water temperature of the hot water supply heat exchanger increases the burner combustion performance. When it becomes below, the reheating alone operation combustion control unit that increases the burning capacity of the burner, and when the reheating instruction is given, drives the circulation pump and does not detect the flow of hot water in the reheating circulation passage. A means for solving the problem is provided with a structure in which a reburning combustion forced start means for immediately starting the burner combustion operation is provided.

In the present invention having the above structure, for example,
In the fourth invention, when a reheating instruction is given,
The reheating combustion forced start means drives the circulation pump and immediately starts the burner combustion operation without detecting the flow of hot water in the reheating circulation passage. Then, by the reheating alone operation combustion control unit, for example, when the hot water temperature of the hot water supply heat exchanger becomes equal to or higher than the set temperature for stopping the burner combustion, the burner combustion is stopped,
When the hot water temperature of the hot water supply heat exchanger becomes equal to or lower than the set temperature at which burner combustion is restarted, combustion control for restarting burner combustion is performed.

By the way, in the one-tank two-channel water heater, which is an example of the one-tank two-channel water heater, the re-heating heat exchanger in the re-heating circulation passage and the hot water supply heat exchanger are integrated.
The circulating hot and cold water circulating in the reheating recirculation passage during the reheating alone operation removes heat from the hot water of the hot water supply heat exchanger heated by the combustion flame of the burner. The amount of heat that the circulating hot water in the reheating circulation passage takes away from the hot water in the hot water supply heat exchanger increases as the flow rate of the hot water circulation in the reheating circulation passage increases.

In the present invention, when a reheating instruction is given, the burner combustion operation is started immediately without detecting the flow of hot water in the reheating circulation passage. When there is no flow of water, the rate of absorption of the heat of the hot water in the hot water supply heat exchanger and the heat absorption by the hot water in the circulation passage is very small. The combustion of the burner is stopped immediately, for example, when the temperature exceeds the set temperature to be stopped. Also, in this way, if the heat absorption of the hot water in the hot water supply heat exchanger by the hot water in the reheating circulation passage is small, the hot water temperature of the hot water supply heat exchanger will gradually decrease after the burner combustion stops. It takes a long time until the temperature becomes lower than the set temperature for stopping the burner combustion.

As described above, according to the present invention, in order to start the burner combustion operation without detecting the flow of the hot and cold water in the additional heating circulation passage when the additional heating instruction is given,
There is no need to provide a water switch or the like in the reheating circulation passage to detect the flow of hot or cold water in the reheating circulation passage.Therefore, with the malfunction of the water flow switch, the reheating operation is not performed erroneously, and By the control of the reheating independent operation combustion control unit, the empty heating on the reheating recirculating heat exchanger side is prevented, and the above problem is solved.

In addition to the one-can-two-channel bath water heater,
A hot water supply heat exchanger, and a non-hot water supply side heat exchanger incorporated in the non-hot water supply side circulation passage for heating a heat medium circulating in the non-hot water supply side circulation passage. The heat exchanger is integrated and provided with a burner for heating the above-mentioned hot water supply heat exchanger and the non-hot water supply side heat exchanger in common. By providing the forced start means and the non-hot-water supply-side independent operation combustion control unit, the non-hot-water supply-side heat exchanger side is prevented from being idly fired as described above, and the above-mentioned problem is solved.

[0029]

Embodiments of the present invention will be described below with reference to the drawings. Note that the one-can two-channel water heater is a one-can two-channel water heater, and in the description of the present embodiment, the same reference numerals are assigned to the same parts as those of the proposed one-can two-channel water heater. , And the overlapping description is omitted.

The one-can two-channel water heater of this embodiment is
Although it has almost the same system configuration as the one-can-two-channel bath water heater of the proposal example shown in FIG. 3, in the present embodiment, the hot water supply heat exchanger hot water detector detects the hot water temperature of the hot water supply heat exchanger 3. A hot water supply hot water temperature sensor 33 as a temperature detecting means is provided in a U-shaped tube of the hot water supply heat exchanger 3 as shown by a broken line in the figure, and in FIG. The running water switch 36 is omitted. FIG. 1 is a block diagram showing a control configuration unique to the embodiment.

As shown in FIG. 1, the control device 40 of the one-tank two-channel bath water heater of the present embodiment includes a reheating combustion forced start means 46, a combustion control unit 42, a reheating single operation monitoring unit 43, It is configured to include a single combustion operation control unit 45 and a data storage unit 44.

The combustion control unit 42 is provided with various operation sequence programs such as hot water supply and reheating.
The combustion control unit 42 fetches information from the remote controller 41 and sensor outputs from the bath temperature sensor 37 and the like, and controls the combustion operation of the water heater in accordance with the fetched information and a sequence program.

The reheating combustion forced start means 46 is a non-hot water supply side combustion starting means. When a reheating instruction is given from the remote controller 41, the recirculation pump 20 is driven and the combustion control unit 42 is operated by the burner combustion operation. A start command is added, whereby the burner combustion operation is immediately started without detecting the flow of hot and cold water in the reheating circulation passage 24.

The reheating independent operation monitoring unit 43 captures the operation information of the combustion control unit 42, and based on this information,
For example, when the hot water supply confirmation switch 35 or the water amount sensor 31 does not detect the flow of water while detecting the driving of the circulation pump 20, the appliance detects that the appliance is operating alone and in other cases, Detects that the appliance is not in reheating alone operation.

In the data storage section 44, an OFF temperature as a set temperature for stopping burner combustion and an ON temperature as a set temperature for restarting burner combustion are stored in advance. The above-mentioned off-temperature is a predetermined hot water temperature (for example, 90 ° C) indicating that the staying hot water in the peak temperature region of the hot-water supply heat exchanger 3 is close to boiling during the reheating alone operation.
° C) is the hot water temperature detected by the hot water supply hot water temperature sensor 33. The ON temperature is a hot water temperature lower than the OFF temperature by a predetermined temperature (for example, 3 ° C.).

The refueling single operation combustion control section 45 is a non-hot water supply side single operation combustion control section, and detects the sensor output of the hot water supply hot water temperature sensor 33 as the hot water temperature of the hot water supply heat exchanger 3 every moment. In addition, the ON temperature and the OFF temperature of the data storage unit 44 and the monitoring information of the additional heating independent operation monitoring unit 43 are fetched every moment, and the fetched detected hot water supply / heat exchanger hot water temperature is compared with the OFF temperature. When it is determined that the hot water supply heat exchanger 3 is at or above the off-temperature while detecting that the additional heating alone operation is being performed based on the monitoring information of the single heating operation monitoring unit 43, the combustion of the burner 2 is performed. Is determined to be necessary, the solenoid valve 10 is closed, and the combustion of the burner 2 is stopped.

Further, the reheating independent operation combustion control section 45 outputs a burner combustion stop signal to the combustion control section 42. The combustion control unit 42 receives the burner combustion stop signal, determines that the burner 2 has stopped burning by the reheating independent operation control, and determines that there is no abnormality of the appliance, and operates the appliance operation such as driving the circulation pump 20. Is performed continuously. For this reason, the drive of the circulation pump 20 is continued during the stop period of the burner 2 during the above-described independent heating operation.

Further, the reheating only operation combustion control unit 45
Continues to take in the sensor output of the hot water supply hot water temperature sensor 33 and the OFF temperature and the ON temperature of the data storage unit 44 even during the stop of combustion of the burner 2 during the reheating alone operation, and The hot water temperature of the hot water supply heat exchanger 3 detected by the temperature sensor 33 is compared with the ON temperature, and when it is determined that the hot water temperature of the hot water supply heat exchanger 3 has fallen below the ON temperature, the combustion of the burner 2 is restarted. Then, it is determined that the burner 2 may be started, and the burner 2 is ignited by using a spot igniting means (not shown) to restart the combustion of the burner 2.

As described above, during the reheating alone operation, the combustion control unit 45 turns on / off the burner 2 during the reheating alone operation.
The off-combustion control is performed so that the peak temperature of the hot water temperature of the hot water supply heat exchanger 3 is controlled to be substantially constant.

The present embodiment is constructed as described above. In this embodiment, when a reheating instruction is given to the water heater by operating the remote controller 41, the recirculating pump is activated by the reheating combustion forced starting means 46. 20 is performed, a burner combustion start command is added to the combustion control unit 42, and the burner combustion operation is immediately started without detecting the flow of hot and cold water in the reheating circulation passage 24. Then, when the water heater is not performing the hot water supply operation, the additional heating independent operation monitoring unit 43 detects that the appliance is performing the independent heating operation, and the additional heating independent operation combustion control unit 45 determines the temperature of the hot water supply hot and cold hot water. On / off combustion control of the burner 2 is performed based on the hot water temperature of the hot water supply heat exchanger 3 detected by the sensor 33 and the above-mentioned off temperature and on temperature.

Then, in the one-can-two-channel bath water heater, the hot water in the reheating circulation passage 24 removes the heat of the hot water in the hot water supply heat exchanger 3, and the reheating is performed by the amount of the absorbed heat. As in the embodiment, when the burner combustion is started immediately when the reheating instruction is given, the temperature of the hot water in the hot water supply heat exchanger 3 rises due to the burner combustion. As the flow of hot water in the reheating circulation passage 24 increases, more heat is deprived. Therefore, as shown by the characteristic line b in FIG.
When there is a flow of hot water 4, the hot water temperature of the hot water supply heat exchanger 3 gradually rises, while when there is no hot water in the reheating steam circulation passage 24 or when there is hot water but no flow of hot water As shown by a characteristic line a in FIG.
Water temperature rises suddenly.

When there is no hot water in the reheating circulation passage 24 or when there is no hot water flow, the hot water temperature of the hot water supply heat exchanger 3 rises to the off-temperature due to a sudden rise in the hot water temperature of the hot water supply heat exchanger 3. As soon as the burner 2 is reached, the combustion of the burner 2 is stopped immediately. Also, at this time, even after the burner combustion is stopped, the hot water in the hot water supply heat exchanger 3 gradually decreases because there is almost no heat absorption from the hot water in the hot water supply heat exchanger 3 due to the hot and cold water in the reheating circulation passage 24. The burner combustion is not restarted because the temperature does not easily fall below the ON temperature. Therefore, when there is no hot water in the reheating circulation passage 24, or when there is no flow of hot water, the reheating combustion operation is performed for only a short time until the hot water temperature of the hot water supply heat exchanger 3 reaches the off-temperature, The refired heat exchanger 4 is temporarily heated only by the amount of heat absorbed by the hot water from the hot water supply heat exchanger 3 to prevent the empty heating.

On the other hand, when there is a flow of hot and cold water in the additional heating circulation passage 24, the combustion of the burner 2 is stopped when the hot water temperature of the hot water supply heat exchanger 3 becomes higher than the OFF temperature, and the hot water of the hot water supply heat exchanger 3 is turned off. When the temperature of the hot water supply heat exchanger 3 is restarted when the temperature becomes equal to or lower than the ON temperature, the peak temperature of the hot water supply heat exchanger 3 is kept substantially constant.
The hot water temperature does not exceed the peak temperature and become very high. And the hot and cold water passing through the reheating circulation passage 24 is
Reheating is performed by the amount of heat absorbed from the hot water in the hot water supply heat exchanger 3.

According to the present embodiment, when the reheating instruction is given as described above, the circulation pump 20 is driven, and the burner combustion operation is performed without detecting the flow of hot water in the reheating circulation passage 24. To start immediately,
It is possible to omit the operation of detecting the flow of hot water in the reheating circulation passage 24 by the water switch 36, which has been conventionally performed, thereby simplifying the reheating operation and the malfunction of the water switch 36. The malfunction of the reheating operation start due to the above can be suppressed. Further, since it is not necessary to detect the flow of the hot water in the reheating circulation passage 24 by the running water switch 36, the running water switch 36 can be omitted, and the system configuration of the water heater is simplified by the omission of the running water switch 36. It is possible to reduce the cost of the device.

In the one-can-two-channel bath water heater of the present embodiment, the hot water in the reheating circulation passage 24 removes heat from the hot water in the hot water supply heat exchanger 3 to perform reheating. Based on the hot water temperature of the hot water supply heat exchanger 3 and the off-temperature and on-temperature, the burner on / off combustion control is performed by the reheating independent operation combustion control unit 45 as described above, so that the hot water in the reheating circulation passage 24 is controlled. Can be suppressed from becoming higher than the peak temperature, and when there is no hot water in the reheating circulation passage 24 or when there is no flow of hot water, the heat of the hot water in the hot water supply heat exchanger 3 Since the hot water temperature of the hot water supply heat exchanger 3 suddenly rises and becomes equal to or higher than the above-mentioned off-temperature without being absorbed by the hot water, the burner combustion is immediately stopped to suppress the empty heating on the reheating heat exchanger 4 side. Can do Kill.

Further, according to this embodiment, the peak temperature of the hot water of the hot water supply heat exchanger 3 is maintained substantially constant by the on / off combustion control of the burner 2 by the reheating independent operation combustion control section 45. Since the control is performed, for example, even if hot water is supplied on the hot water supply side during the reheating alone operation, it is possible to avoid high-temperature hot water caused by the reheating alone operation.

The present invention is not limited to the above-described embodiment, but can adopt various embodiments. For example,
In the above embodiment, the reheating combustion forced start means 46 is provided, and when the reheating instruction is added from the remote controller 41, the circulating pump 20 is driven and the burner is detected without detecting the flow of the reheating circulation passage 24. Although the combustion operation is started immediately, for example, as shown by a dashed line in FIG. 1, a bath automatic warming control unit 48 and the like are provided, and the temperature of the bath water (the temperature detected by the bath temperature sensor 37) is measured by the bath. In a device with an automatic warming function for giving a reheating instruction so that the temperature does not become lower than a predetermined temperature than the preset temperature, even when the reheating instruction is given, the reheating combustion forced starting means 46 The circulation pump 20 is driven, and the burner combustion is immediately started without detecting the flowing water in the reheating circulation passage 24.

In the above-described embodiment, the circulation pump 20 is directly driven by the reheating combustion forced starting means 46 when the reheating instruction is given. A pump drive command is applied to the control unit 42, and the command is supplied to the combustion control unit 42.
May be used to drive the circulation pump 20.

Further, in the above-described embodiment, the additional heating single operation combustion control unit 45 determines that the hot water temperature of the hot water supply heat exchanger 3 detected by the hot water supply hot water temperature sensor 33 during the additional heating alone operation is equal to or higher than the OFF temperature. , The combustion of the burner 2 is stopped, and when the hot water temperature of the hot water supply heat exchanger 3 becomes lower than the ON temperature, the combustion of the burner 2 is restarted. When the hot water temperature of the hot water supply heat exchanger 3 becomes equal to or higher than the set temperature at which the burner combustion performance is reduced, the combustion performance of the burner 2 is reduced, and the hot water temperature of the hot water supply heat exchanger 3 is lower than the set temperature at which the burner combustion performance is increased. , The combustion capacity of the burner 2 may be increased.

Further, in the above embodiment, the hot water supply hot water temperature sensor 33 is provided in the U-shaped tube of the hot water supply heat exchanger 3, but as shown by a chain line in FIG. It may be provided on the exit side.

Further, in the above embodiment, the hot water temperature of the hot water supply heat exchanger 3 is directly detected from the hot water supply hot water temperature sensor 33. However, the hot water temperature of the hot water supply heat exchanger 3 is reduced to the exhaust gas temperature. Since it is possible to indirectly detect the hot water, the relation data between the exhaust gas temperature and the hot water temperature of the hot water supply heat exchanger 3 is obtained in advance through experiments, calculations, and the like, and given. A hot water supply heat exchanger hot water temperature detecting means for indirectly detecting the hot water temperature of the heat exchanger 3 may be provided. More preferably, the hot-water supply heat exchanger hot-water temperature detected based on the above-mentioned relational data and the exhaust temperature is used as the hot-water circulation passage temperature detected by the bath temperature sensor 37, a predetermined hot-fired circulation hot water amount, and the supply air temperature. In consideration of the above, it is possible to detect the hot water temperature of the hot water supply heat exchanger 3 more accurately.

Further, in the above embodiment, the running water switch 36 is omitted, but the running water switch 36 may be provided to constitute a one-can-two-channel bath water heater.

Further, each of the above embodiments has been described with reference to an example of a one-can, two-channel bath water heater shown in FIG. 3, but a one-can, two-channel water heater for detecting the hot water temperature of a hot water 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 limited to a one-can two-channel bath water heater, but also a hot water supply heat exchanger and a non-hot water supply side incorporated in a non-hot water supply side circulation passage for heating a heat medium circulating in the non-hot water supply side circulation passage. A heat exchanger, wherein the hot water supply heat exchanger and the non-hot water supply side heat exchanger are integrated, and a burner for heating the hot water supply heat exchanger and the non-hot water supply side heat exchanger in common is provided.
For example, the present invention can also be applied to a one-can, two-channel water heater such as a hot water supply heater shown in FIG. In FIG. 4, reference numeral 51 denotes a heating circulation passage as a non-hot-water supply side circulation passage, and reference numeral 57 denotes a heating heat exchanger as a non-hot-water supply side heat exchanger. For example, a mixture of ethylene glycol and propylene glycol with water is used. In FIG. 4, reference numeral 52 denotes a heating on / off valve, 53 denotes a radiator, 54 denotes a fan, 55 denotes a cistern tank, and 56 denotes a bypass passage.

[0055]

According to the present invention, a means for forcibly starting non-hot water supply, such as reheating, is provided, and when an operation instruction for the non-hot water supply side, such as reheating, is given, the non-hot water supply side, such as a reheating circulation passage, is provided. Since the circulating pump in the circulating passage is driven and the burner combustion operation is started immediately without detecting the flow of the heat medium in the circulating passage, a non-hot water supply side operation instruction such as reheating is given. In this case, the operation of detecting the flow of the heat medium in the non-hot water supply side circulation passage such as the additional heating circulation passage, which has been conventionally performed, can be omitted, thereby simplifying the non-hot water supply side operation start operation such as additional heating. be able to.
Further, in order to start the burner combustion operation without detecting the flow of the heat medium in the non-hot water supply side circulation passage such as the reheating heating circulation passage, the flow detection means such as a flowing water switch conventionally provided in the non-hot water supply side circulation passage is used. It is possible to suppress that a non-hot water supply side driving operation such as reheating is performed by mistake due to a malfunction,
It is also possible to omit the flow detection means, and it is possible to simplify the system configuration of the water heater by that much,
The cost of the device can be reduced.

Further, according to the present invention, a hot water supply heat exchanger hot water temperature detecting means for detecting hot water temperature of hot water supply heat exchange is provided, and the hot water supply heat exchanger hot water temperature detecting means is provided during non-hot water supply side alone operation such as reheating. When the hot water temperature of the hot water supply heat exchanger detected by the above becomes equal to or higher than the set temperature for stopping the burner combustion, the combustion of the burner is stopped, and the hot water temperature of the hot water supply heat exchanger falls below the set temperature for restarting the burner combustion. Occasionally, the burner combustion is restarted, or the burner combustion capacity is reduced when the temperature falls below a set temperature at which the burner combustion capacity is reduced. It is equipped with a reheat-only operation control unit and a non-hot water supply-side operation control unit that increase the temperature of the hot water supply heat exchanger. The temperature of the hot water medium in the non-hot-water supply side circulation passage in which the non-hot-water supply side operation such as reheating by taking out the heat of the hot water in the hot-water supply heat exchanger is performed by the set temperature or the burner for stopping the burner combustion It is possible to prevent the temperature from greatly increasing beyond the set temperature for increasing the combustion capacity.

In the one-can two-channel water heater, when there is no heat medium such as hot water in the non-hot water supply side circulation passage such as the additional heating circulation passage, or when there is no flow of the heat medium, the hot water supply heat exchanger side According to the present invention, since the heat of the hot water supply heat exchanger rises sharply by the burner combustion because the heat of the hot water is hardly taken away by the heat medium of the non-hot water supply side circulation passage, Even if the burner combustion is started without detecting the flow of water, the hot water temperature of the hot water supply heat exchanger immediately reaches the set temperature for stopping the burner combustion, and the burner combustion is stopped. Since it is possible to prevent empty heating on the exchanger side, it is possible to provide a very safe water heater.

Further, according to the present invention, when there is a flow of the heat medium in the non-hot water supply side circulation passage, the temperature of the hot water in the hot water supply heat exchanger rises slowly and the set temperature for stopping the burner combustion or the burner combustion capacity is reduced. The set temperature to be lowered is reached, whereby the burner combustion is stopped, or the burnability of the burner is reduced, and thereafter, the temperature of the hot water in the hot water heat exchanger gradually decreases after the post-boiling, and the burner combustion is stopped. When the set temperature to be restarted or the set temperature to increase the burner combustion capacity becomes equal to or less than the set temperature, the burner combustion is restarted or the burner combustion capacity is increased and such burner combustion control is performed. Thereby, the non-hot water supply side operation such as reheating can be performed safely.

[Brief description of the drawings]

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

FIG. 2 shows the hot water temperature characteristic of the hot water supply heat exchanger which varies depending on the hot water circulation flow rate of the reheating steam circulation passage in the one-can two-water water heater of the embodiment, and on / off combustion control of the burner performed according to the hot water temperature characteristic. It is an explanatory view of an operation.

FIG. 3 is an explanatory diagram showing a model example of a one-can-two-channel bath water heater.

FIG. 4 is an explanatory diagram of a main part system showing a model example of a hot water supply heater as a one-can two-channel water heater.

[Explanation of symbols]

 2 Burner 3 Hot water supply heat exchanger 4 Reheating heat exchanger 20 Circulation pump 24 Reheating heating circulation passage 33 Hot water supply hot water temperature sensor 45 Reheating single combustion control unit 46 Reheating combustion forced start means

Claims (4)

[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 Is provided with a hot water supply heat exchanger hot water temperature detecting means for detecting the hot water temperature of the hot water supply heat exchanger, and the non-hot water supply side only performs the operation on the non-hot water supply side without performing hot water supply. During operation, when the hot water temperature of the hot water supply heat exchanger detected by the hot water supply heat exchanger hot water detecting means becomes equal to or higher than a set temperature for stopping burner combustion, the burner combustion is stopped, and the hot water of the hot water supply heat exchanger is turned off. Temperature is below the set temperature for restarting burner combustion. When the non-hot water supply side operation instruction is given, the non-hot water supply side operation control unit that restarts combustion of the burner drives the circulation pump and controls the flow of the heat medium in the non-hot water supply side circulation passage. Non-hot water supply forced combustion start means for immediately starting a burner combustion operation without detection is provided. 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 Is provided with a hot water supply heat exchanger hot water temperature detecting means for detecting the hot water temperature of the hot water supply heat exchanger, and the non-hot water supply side only performs the operation on the non-hot water supply side without performing hot water supply. During operation, when the hot water temperature of the hot water supply heat exchanger detected by the hot water supply heat exchanger temperature detecting means becomes equal to or higher than a set temperature at which the burner combustion performance is reduced, the combustion performance of the burner is reduced. Setting to increase burner combustion capacity A non-hot-water-supply-side independent operation combustion control unit for increasing the combustion capacity of the burner when the temperature becomes lower than or equal to a temperature; A one-can, two-channel water heater comprising a non-hot water supply forced combustion start means for immediately starting a burner combustion operation without detecting a medium flow. 3. 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 a hot water that is incorporated in the additional heating circulation passage provided with a circulation pump and circulates through the additional heating circulation passage. Having a reheating heat exchanger for heating, the hot water supply heat exchanger and the reheating heat exchanger are integrated, a burner for heating the hot water supply heat exchanger and the reheating heat exchanger in common is provided, One can with a hot water supply function of supplying hot water produced by the hot water supply heat exchanger through the hot water supply passage and a reheating function of heating the bathtub hot water through the reheating heat exchanger of the reheating circulation circuit to reheat the bath In the water channel water heater, a hot water supply heat exchanger hot water temperature detecting means for detecting the hot water temperature of the hot water supply heat exchanger is provided, and the hot water supply heat exchanger hot water temperature detecting means is provided during the additional heating only operation in which hot water is not supplied and only the additional heating is performed. Hot water detected by When the temperature of the hot water of the exchanger becomes equal to or higher than the set temperature for stopping the burner combustion, the combustion of the burner is stopped, and when the temperature of the hot water of the hot water supply heat exchanger becomes equal to or lower than the set temperature for restarting the burner combustion, the combustion of the burner is stopped. The reheating reheating independent operation combustion control unit, and the reheating that drives the circulation pump when a reheating instruction is given and immediately starts the burner combustion operation without detecting the flow of hot water in the reheating circulation passage A one-can, two-channel water heater comprising a forced combustion start means. 4. 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 hot water that is incorporated in the supplementary heating circulation passage provided with a circulation pump and circulates through the supplementary heating circulation passage. Having a reheating heat exchanger for heating, the hot water supply heat exchanger and the reheating heat exchanger are integrated, a burner for heating the hot water supply heat exchanger and the reheating heat exchanger in common is provided, One can with a hot water supply function of supplying hot water produced by the hot water supply heat exchanger through the hot water supply passage and a reheating function of heating the bathtub hot water through the reheating heat exchanger of the reheating circulation circuit and reheating the bath In the water channel water heater, a hot water supply heat exchanger hot water temperature detecting means for detecting the hot water temperature of the hot water supply heat exchanger is provided, and the hot water supply heat exchanger hot water temperature detecting means is provided during the additional heating only operation in which hot water is not supplied and only the additional heating is performed. Hot water detected by When the hot water temperature of the exchanger becomes equal to or higher than a set temperature at which the burner combustion capacity is reduced, the burner combustion capacity is reduced. When the hot water temperature of the hot water supply heat exchanger becomes equal to or lower than the set temperature at which the burner combustion capacity is increased, the burner is reduced. The reheating alone operation combustion control unit for increasing the combustion capacity of the reheating and the recirculation pump is driven when the reheating instruction is given, and the burner combustion operation is immediately performed without detecting the flow of hot water in the reheating recirculation passage. A one-can, two-channel water heater comprising a reburning combustion forced start means for starting.