JPH1183170A - Hot water supply unit having single storage water heater body and two water channels - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water supply unit having a signal storage water heater body and two water channels in which boiling up of bath water is prevented from being delayed at the time of simultaneous combustion. SOLUTION: A bypass 25 communicating between a water supply path 11 and a hot water supply path 12 while bypassing a hot water supply heat exchanger 10 is provided with means 26 for controlling the quantity of water passing through the bypass 25 variably by varying the valve opening. The quantity of combustion heat of a burner 3 is increased at the time of simultaneous combustion as compared with single operation of hot water supply. Consequently, the water passing through an additional burning heat exchanger 14 receives more heat and boiling up of bath water is prevented from being delayed. Although the temperature of hot water delivered from the hot water supply heat exchanger 10 increases, it can be lowered by increasing the valve opening of the bypass flow rate control means 26 and supplying water from the bypass 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply heat exchanger and a non-hot water supply side heat exchanger integrated with each other, and a burner for burning and heating the hot water supply heat exchanger and the non-hot water supply side heat exchanger in common. The present invention relates to a one-can, two-channel water heater.

[0002]

2. Description of the Related Art FIG. 5 shows a model example of a system configuration of a one-can, two-channel water heater (apparatus) by a solid line. This apparatus has a hot water supply function and a bath water function that is a non-hot water supply side function. It is equipped with a bath function such as upholstery and reheating. In this appliance, a burner 3 is provided in an appliance case 1, and a gas supply passage 4 for guiding fuel gas to the burner 3 is connected to the burner 3, and the gas supply passage 4 opens and closes the passage. Solenoid valves 5 and 6 and a proportional valve 8 that controls the supply amount of fuel gas based on the valve opening are provided.

[0003] Above the burner 3, a hot water supply heat exchanger 10 is provided.
Is provided, one end of a water supply passage 11 is connected to the inlet side of the hot water supply heat exchanger 10, and the other end of the water supply passage 11 is connected to a water supply source via an external pipe. One end of a hot water supply passage 12 is connected to the outlet side of the hot water supply heat exchanger 10, and the other end of the hot water supply passage 12 is connected to a hot water supply place such as a kitchen or a shower through an external pipe.

[0004] Above the hot water supply heat exchanger 10, a reheating heat exchanger 14 is provided integrally with the hot water supply heat exchanger 10 as a non-hot water supply side heat exchanger. Is connected to one end of a return pipe 15.
The other end of 5 is connected to a bathtub 17 via an external pipe, one end of a passage 16 is connected to the exit side of the reheater 14, and the other end of the passage 16 is suctioned by a circulation pump 18. Connected to the mouth. One end of an outgoing pipe 20 is connected to the discharge port of the circulation pump 18, and the other end of the outgoing pipe 20 is connected to the bathtub 17 via an external pipe. The recirculation passage, which is a non-hot water supply side circulation passage for recirculating the hot water in the bathtub 17 as a heat medium by the return pipe 15, the reheating heat exchanger 14, the passage 16, the circulation pump 18, and the outflow pipe 20. A passage 21 is formed.

The hot water supply passage 12 and the additional heating circulation passage 21
Is provided, and a pouring control valve 24 for opening and closing the passage is interposed in the hot water passage 22.

In FIG. 5, reference numeral 28 denotes a water flow sensor for detecting the flow rate of water flowing through the water supply passage 11, reference numeral 30 denotes a water input thermistor for detecting the temperature of hot water in the water supply passage 11,
Reference numeral 31 denotes a hot water supply thermistor that detects the temperature of hot water to be supplied, 32 denotes a water level sensor that detects a bathtub water level by water pressure, and 33 denotes a bath temperature sensor that detects the temperature of hot water in the reheating circulation passage 21 as a bath temperature. ing.

[0007] The one-can two-channel water heater is provided with a control device 35 for controlling equipment operation such as hot water supply, hot water filling, reheating, and heat retention. A remote control 36 is connected to the control device 35 by a signal. ing. The remote controller 36 is provided with hot water supply temperature setting means for setting hot water supply temperature, bath temperature setting means for setting bath temperature, water level setting means for setting bath water level, and the like.

The control device 35 controls the hot water supply operation as follows. For example, when a hot water tap (not shown) such as a kitchen or a shower in the hot water supply passage 12 is opened and the water amount sensor 28 detects a water flow rate equal to or higher than a predetermined hot water supply operation operating flow rate,
The solenoid valves 5 and 6 are opened to supply fuel gas to the burner 3 to start the combustion of the burner 3 and to control the proportional valve 8 so that the temperature of the hot water becomes the hot water set temperature set in the remote controller 36. Controlling the valve opening (that is, controlling the amount of fuel gas supplied to the burner 3) to control the amount of combustion heat of the burner 3;
The hot water supply heat exchanger 10 heats the water supplied from the water supply passage 11 by the heat of the combustion flame of the burner 3 to produce hot water, and supplies the hot water through the hot water supply passage 12. Then, when the hot water tap is closed and the water amount sensor 28 detects the stoppage of water supply, the solenoid valves 5 and 6 are closed to stop the combustion of the burner 3, and
The hot water supply operation ends.

When performing the hot water filling operation, the pouring control valve 24 is opened, hot water is produced by the hot water supply heat exchanger 10 in the same manner as described above, and the hot water is recirculated to the hot water supply passage 12 and the hot water filling passage 22 for recirculation. The hot water is poured into the bathtub 17 through the passage 21 in order. Then, when the bathtub water level detected by the water level sensor 32 reaches the set water level set in the remote controller 36, the pouring control valve 24 is closed to stop the combustion of the burner 3 and end the filling operation. .

Further, when performing the reheating operation, the circulation pump 18 is driven, and the return pipe 15, the reheating heat exchanger 14, the passage 16, the circulation pump 18, and the outgoing pipe 2 are returned from the bathtub 17.
In addition to circulating the bath water in the reheating circuit, which returns to the bath 17 in order through 0, burns the burner 3 and reheats the bath water in the reheat heat exchanger 14 by the heat of the combustion flame of the burner 3. When the bath temperature detected by the bath temperature sensor 33 reaches the bath set temperature set in the remote controller 36, the combustion of the burner 3 is stopped, and the circulation pump 18 is stopped to end the reheating operation. . During the reheating operation, the burner 3 is normally burned by controlling the heat of combustion of the burner 3 to be close to a predetermined maximum heat of combustion so that the bath can be heated as soon as possible.

Further, when a warming function is provided, the circulation pump 18 is driven at predetermined time intervals (for example, every 30 minutes) after the reheating operation, and the bath temperature sensor is operated. 33 detects the temperature of the bath,
When the detected bath temperature is lower than the bath set temperature and exceeds a predetermined allowable temperature, the burner 3 is burned,
The reheating of the bathtub is used to raise the temperature of the bath to the set temperature to keep the bath warm.

[0012]

In the case of simultaneous combustion in which both the hot water supply operation and the reheating operation are performed, the combustion of the burner 3 is performed with priority given to the hot water supply operation so that the hot water supply temperature becomes a predetermined hot water supply set temperature. Control of the amount of heat is performed. In the one-can two-channel water heater, as described above, the hot water supply heat exchanger 10 and the reheating heat exchanger 14 are integrated, and the heat of the combustion flame of the burner 3 causes the hot water supply heat exchanger 10 and the reheating heat exchanger to be integrated. 1
4 are heated together, it is inevitable that the combustion control of the burner 3 is performed with a combustion heat amount near a predetermined minimum combustion heat amount, such as when the hot water supply set temperature is set low. In particular, the amount of heat received by the water flowing through the reheating heat exchanger 14 was so small that it took a long time for the bath to be heated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to boil a bath while supplying hot water at a set hot water supply temperature during simultaneous combustion. An object of the present invention is to provide a one-can-two-channel water heater that can suppress an increase in time.

[0014]

In order to achieve the above object, the present invention has the following structure to solve the above-mentioned problems. That is, the first aspect of the present invention provides a hot water supply heat exchanger that heats water supplied from a water supply passage to produce hot water and sends the hot water to the hot water supply passage, and a non-water supply heat exchanger that heats a heat medium supplied through a non-hot water supply side circulation passage. The hot water supply heat exchanger, the hot water supply heat exchanger and the non-hot water supply side heat exchanger are integrated, and a burner for burning and heating the integrated hot water supply heat exchanger and the non-hot water supply side heat exchanger in common is provided. In a one-can two-channel water heater that can perform a hot water supply operation for supplying hot water produced by a hot water supply heat exchanger and a non-hot water supply side operation for heating a heat medium by a non-hot water supply side heat exchanger, A bypass passage connecting the passage and the hot water supply passage so as to bypass the hot water supply heat exchanger; a bypass flow rate control means capable of variably controlling a flow rate of the bypass passage by a valve opening; During simultaneous combustion with side operation A simultaneous combustion combustion heat amount increasing control unit for increasing the combustion heat amount of the burner over the combustion heat amount in the hot water supply alone operation to perform burner combustion control; and the simultaneous combustion combustion heat amount increase control unit increasing the burner combustion heat amount. When the valve is open, the valve opening of the bypass flow rate control means is controlled in the opening direction to control the opening of the hot water supply heat exchanger corresponding to the amount of combustion heat increase by the combustion heat increase control of the simultaneous combustion combustion heat increase control section. A hot water supply temperature decrease correction control unit that corrects the rise in temperature by water flowing from the bypass passage to the hot water supply passage;

According to a second aspect of the present invention, there is provided a hot water supply heat exchanger for heating water supplied from a water supply passage to produce hot water and sending the hot water to the hot water supply passage, and for heating and purifying bath water supplied through the reheating circulation passage. A reheating heat exchanger for performing the heating, the above-mentioned hot water supply heat exchanger and the reheating heat exchanger are integrated, and a burner for burning and heating the integrated hot water supply heat exchanger and the reheating heat exchanger in common is provided. In a one-can, two-channel water heater, which can perform a hot water supply operation for supplying hot water produced by the hot water supply heat exchanger and a reheating operation for reheating the bathtub water using the reheating heat exchanger. A bypass passage communicating between the passage and the hot water supply passage, bypassing the hot water supply heat exchanger;
A bypass flow rate control means capable of variably controlling a flow rate of the water in the bypass passage by a valve opening degree; in a simultaneous combustion in which both the hot water supply operation and the reheating operation are performed, the combustion heat amount of the burner is calculated from the combustion heat amount in the hot water supply alone operation. A simultaneous combustion combustion heat amount increase control unit for controlling burner combustion by increasing the burner combustion heat amount by the simultaneous combustion combustion heat increase control unit. The water flowing out of the bypass passage into the hot water supply passage from the bypass passage is controlled in the opening direction and the amount of increase in the hot water temperature on the outlet side of the hot water supply heat exchanger corresponding to the increase in combustion heat amount by the combustion heat increase control of the simultaneous combustion heat amount increase control unit. And a hot-water supply temperature decrease correction control unit that compensates for the decrease in temperature.

According to a third aspect of the present invention, there is provided a hot water supply heat exchanger for heating water supplied from a water supply passage to produce hot water and sending the hot water to the hot water supply passage, and for heating and purifying bath water supplied through a reheating circulation passage. A reheating heat exchanger for performing the heating, the above-mentioned hot water supply heat exchanger and the reheating heat exchanger are integrated, and a burner for burning and heating the integrated hot water supply heat exchanger and the reheating heat exchanger in common is provided. In a one-can, two-channel water heater, which can perform a hot water supply operation for supplying hot water produced by the hot water supply heat exchanger and a reheating operation for reheating the bathtub water using the reheating heat exchanger. A bypass passage communicating between the passage and the hot water supply passage, bypassing the hot water supply heat exchanger;
A bypass flow rate control means capable of variably controlling the flow rate of water in the bypass passage by the valve opening; and a flow rate on the hot water side where water flowing out from the bypass passage joins can be variably controlled by the valve opening. Hot water side flow rate control means; simultaneous combustion in which both the hot water supply operation and the reheating operation are performed, the combustion heat amount of the burner is increased to be greater than the combustion heat amount in the hot water supply alone operation, and the combustion heat amount increase control in simultaneous combustion is performed. When the combustion heat amount is controlled to increase by the simultaneous combustion combustion heat amount increase control unit, the valve opening of the bypass flow rate control means is controlled to open and the valve opening of the hot water side flow control means is closed. The bypass flow rate and hot-side flow flowing through the bypass passage in a direction in which the temperature of the hot water after mixing the water flowing out of the bypass passage with the hot water on the hot water side becomes a predetermined hot water supply set temperature. And a means for solving the problem with a the provided configuration; flow rate control means and for controlling the flow ratio of.

According to a fourth aspect of the present invention, there is provided the first, second or third aspect.
The simultaneous combustion combustion heat amount increase control unit constituting the invention according to the invention includes a water and hot water side flowing out of the bypass passage in a state where the valve opening of the bypass flow rate control means is controlled in the opening direction in accordance with the burner combustion heat amount increase control. The maximum amount of combustion heat capable of controlling the temperature of the hot and cold water after mixing with the hot water to the set hot water supply temperature is determined within a predetermined range of the amount of combustion heat, and the burner combustion control is performed with the obtained amount of combustion heat. It is a means to solve the problem.

According to a fifth aspect of the present invention, there is provided a hot water supply heat exchanger for heating water supplied from a water supply passage to produce hot water and supply the hot water.
A reheating heater for heating the bathtub water supplied through the reheating circulation passage for reheating, the above-mentioned hot water supply heat exchanger and the reheating heat exchanger are integrated, and the integrated hot water supply heat exchanger There is a burner that burns and heats the boiler heat exchanger in common.Hot water supply operation to make hot water with a hot water supply heat exchanger and supply hot water at a predetermined hot water supply set temperature, and bath water with a reheating heat exchanger In a one-can two-channel water heater capable of performing a reheating operation for performing a reheating operation, a circulation pump capable of variably controlling a flow rate of circulating hot water flowing in the reheating heating circulation passage; and a hot water supply operation and a reheating operation A simultaneous-combustion circulation flow rate increase control unit that increases the circulation flow rate of the supplementary heating circulation passage by the circulation pump at the time of simultaneous combustion performed together with that of the supplementary heating operation. And a means for solving the problems I.

In the invention having the above structure, for example, the simultaneous combustion combustion heat amount increase control section performs burner combustion control by increasing the burner combustion heat amount in comparison with the combustion heat amount in the hot water supply alone operation at the time of simultaneous combustion. Since the temperature of flowing water flowing through the hot water supply heat exchanger rises due to the control of increasing the amount of combustion heat by the control unit for increasing the amount of combustion heat during simultaneous combustion, the non-hot water supply heat exchanger (reheater) is taken from the hot water supply heat exchanger. The amount of heat absorbed by the reheating heat exchanger is increased, and the amount of heat received by the water flowing through the reheating heat exchanger is increased, so that the time required for boiling the bath is suppressed from becoming longer.

As described above, the temperature of the hot water flowing out of the hot water supply heat exchanger is increased by the control of increasing the amount of combustion heat by the control unit for increasing the amount of combustion heat during simultaneous combustion. In this way, the water flows from the bypass passage into the hot water supply passage, is mixed with the hot water flowing out of the hot water supply heat exchanger, and the temperature of the hot water is reduced.

In the case where the circulating flow rate of the reburning circulation passage is controlled to be increased by the circulating pump by the simultaneous combustion circulating flow rate increasing control unit during the simultaneous combustion, the circulating flow rate of the simultaneous combustion circulating flow rate increasing control unit is simultaneously controlled. Due to the increase in the flow rate, the circulation flow rate in the reheating heat exchanger increases, and due to the increase in the circulation flow rate, the amount of heat absorbed by the reheating heat exchanger from the hot water supply heat exchanger increases. It is possible to prevent the time required for boiling up from becoming long.

As described above, when the amount of heat taken from the hot water supply heat exchanger to the reheating heat exchanger increases, the temperature of the hot water flowing out of the hot water supply heat exchanger decreases, but the burner combustion heat amount is automatically and immediately controlled by the hot water supply operation control. Is increased to compensate for the decrease in the hot water temperature, so that hot water at the hot water supply set temperature is supplied.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

The one-tank two-channel water heater of the first embodiment has the system configuration shown in FIG. 5, and FIG. 1 is a block diagram showing a characteristic control configuration in this embodiment. . In the description of this embodiment, FIG.
Since the description of the system configuration of the device has been described above, the duplicate description thereof will be omitted.

As shown in FIG. 1, a control device 35 characteristic of the first embodiment is a hot water supply operation control unit 37.
And the simultaneous combustion monitoring unit 38, the reheating operation control unit 40, the simultaneous flow circulation increase control unit 41, and the circulation flow variable control unit 4
2 are provided.

A hot water supply operation sequence program for controlling the hot water supply operation as described above is given to the hot water supply operation control unit 37 in advance, and the hot water supply operation control unit 37 includes a water amount sensor 28, a water input thermistor 30, and a hot water supply thermistor. 3
The hot water supply operation is performed according to the sequence program of the hot water supply operation described above by taking in information such as the hot water supply set temperature 1 and the hot water supply set temperature set in the remote controller 36. In this embodiment, the hot water supply operation control unit 37 controls the flow rate Q detected by the water quantity sensor 28.
The hot water supply temperature T set on the remote controller 36 from the water input temperature Tin detected by the water input thermistor 30 for the water of tl.
Feed forward combustion heat quantity Pff required to increase to st
(Pff = Qtl · (Tst−Tin) · η (η is thermal efficiency))
And hot water supply temperature T detected by hot water supply thermistor 31 flowing out of hot water supply heat exchanger 10 with respect to hot water supply set temperature Tst.
The combustion heat amount of the burner 3 is controlled by proportional control using the feedback combustion heat amount Pfb (Pfb = Qtl · (Tst−Tout) · η) required to correct the difference of out.

A sequence program for controlling the reheating operation is given to the reheating operation control unit 40 in advance, and the reheating operation control unit 40 will be described later when a reheating command is issued from the remote controller 36 or the like. The circulating pump 18 is driven by the predetermined drive amount in the reheating alone operation by the circulating flow variable control unit 42 to perform the reheating operation as described above according to the reheating operation sequence program.

When the circulating flow variable control unit 42 receives a circulating pump drive start command from the reheating operation control unit 40,
The circulating pump 18 is driven by supplying power to the circulating pump 18 from an electric power supply source (for example, a commercial power supply). 18 is stopped, and the amount of electric power supplied to the circulation pump 18 is variably controlled as described below, so that the circulation flow rate flowing through the reheating circulation passage 11 can be variably controlled.

When the amount of electric power supplied to the circulation pump 18 increases, the driving amount of the circulation pump 18 increases and the circulation flow rate of the reheating circulation passage 21 increases.
When the amount of power supplied to the circulation pump 8 decreases, the driving amount of the circulation pump 18 decreases and the circulation flow rate of the reheating circulation passage 21 decreases.
The circulating flow rate of the reheating circulation passage 21 is variably controlled by variably controlling the amount of electric power (that is, voltage) supplied to the circulating passage 21 by, for example, a phase control method.

In this embodiment, when the circulation flow variable control unit 42 receives a drive command for the circulation pump 18 from the reheating operation control unit 40, a predetermined pump supply voltage (for example, 80 V) during reheating alone operation is used. Is supplied to the circulation pump 18 to drive the circulation pump 18.

The simultaneous combustion monitoring unit 38 fetches each operation information of the hot water supply operation control unit 37 and the additional heating operation control unit 40, and monitors whether or not the appliances are performing simultaneous combustion based on the information. That is, when the water amount sensor 28 detects the flow of water through the water supply passage 11 and the circulation pump 18 is driven, it is detected that simultaneous combustion is being performed, and otherwise, simultaneous combustion is not being performed. Is detected. When the simultaneous combustion monitoring unit 38 detects that simultaneous combustion is being performed, the hot water supply operation is performed with priority.

The simultaneous combustion circulation flow rate increase control section 41 fetches the monitoring information of the simultaneous combustion monitoring section 38 from time to time, and when it is detected that simultaneous combustion is being performed based on the monitoring information, the circulating flow rate variable. The circulation flow rate increase command is issued to the control unit 42, and the circulation flow rate increase control by the circulation flow rate variable control unit 42 increases the drive amount of the circulation pump 18 so that the circulation flow rate of the reheating circulation passage 21 is increased as compared with the reheating alone operation. Let it.

For example, the circulating flow rate variable control unit 42 increases the amount of electric power supplied to the circulation pump 18 by a predetermined increase amount from the time of the sole-fired operation alone (for example, the pump supply voltage 80 V during the single-fired operation). From 100 V to 100 V), and increase the driving amount of the circulation pump 18 to increase the circulation flow rate of the reheating circulation passage 21.

As described above, at the time of simultaneous combustion, by increasing the circulation flow rate of the reheating circulation passage 21, the flow rate of water flowing through the reheating heat exchanger 14 naturally increases,
Since the amount of heat absorbed by the reheating heat exchanger 14 from the hot water supply heat exchanger 10 increases due to the increase in the flow rate of water flowing through the reheating heat exchanger 14, the amount of heat received by the water flowing through the reheating heat exchanger 14. And the temperature of the bath water rises faster, which can prevent the time required for the bath to boil up during simultaneous combustion from being lengthened.

By increasing the circulation flow rate in the reheating circulation passage 21 as described above, the amount of heat taken from the hot water supply heat exchanger 10 to the reheating heat exchanger 14 increases, so that the flow of water in the hot water supply heat exchanger 10 is received. Although the amount of heat decreases and the temperature of the hot water flowing out of the hot water supply heat exchanger 10 decreases, the amount of combustion heat of the burner 3 is increased by proportional control of the hot water supply operation control unit 37 so as to immediately compensate for the decrease in the hot water temperature. Hot water at a set temperature can be supplied.

According to this embodiment, at the time of simultaneous combustion, the circulation flow rate of the additional heating circulation passage 21 is set to be larger than that at the time of the additional combustion alone operation.
As compared with the case where hot water flows through the reheating heat exchanger 14 at the same circulation flow rate as during the reheating alone operation, the amount of heat absorbed by the reheating steam exchanger 14 from the hot water supply heat exchanger 10 increases due to the increase in the circulation flow rate. The heat exchanger 14
The amount of heat absorbed by the flowing water increases, the temperature of the bath water rises faster, and the time required for the bath to boil can be reduced.

In this embodiment, the hot water supply operation control unit 37 performs proportional control using the feedforward combustion heat amount Pff and the feedback combustion heat amount Pfb in combination with the burner 3.
As described above, the recirculation flow passage 2 is controlled by the simultaneous combustion circulation flow rate increase control unit 41 as described above.
Even if the circulation flow rate of 1 increases and the amount of heat absorbed from the hot water supply heat exchanger 10 to the reheating heat exchanger 14 increases, and the temperature of the hot water flowing out of the hot water supply heat exchanger 10 decreases, the feedback combustion heat amount Pfb remains unchanged. Since the amount of combustion heat of the burner 3 is controlled to increase, the decrease in the hot water temperature is immediately compensated,
Hot water at the hot water supply set temperature can be supplied stably without being affected by the increase control of the reheating circulation flow rate.

In the first embodiment, the voltage supplied to the circulation pump 18 is increased by a predetermined amount from the voltage supplied to the pump 18 in the reheating alone operation to reduce the circulation flow rate in the reheating circulation passage 21. Although it has been increased, for example, the maximum combustion heat amount or a predetermined vicinity thereof is determined in advance by a combination of the bath temperature detected by the bath temperature sensor 33, the water inlet temperature Tin detected by the water inlet thermistor 30, and the hot water supply set temperature Tst. A circulation flow rate at which hot water at a set hot water supply temperature can be supplied when the burner 3 is burned with the amount of combustion heat is determined in consideration of a variable drive amount range of the circulation pump 18, and is the determined circulation flow rate. Circulating pump 1
8 may be increased.

Hereinafter, a second embodiment will be described. In this embodiment, in addition to the system configuration shown by the solid line in FIG. 5, a bypass passage connecting the water supply passage 11 and the hot water supply passage 12 to bypass the hot water supply heat exchanger 10 and to communicate therewith as shown by the dotted line in FIG. The bypass passage 25 is provided with a bypass flow rate control means 26. The bypass flow rate control means 26 is a normally closed flow rate control valve capable of variably controlling the flow rate of water flowing through the bypass passage 25 by the valve opening degree, such as a gear motor for variably controlling the valve opening degree. Are provided. The hot water supply thermistor 31 is connected to the hot water supply passage 12 downstream of the connection X with the bypass passage 25,
Since the rest of the system configuration in FIG. 5 has been described above, a duplicate description thereof will be omitted.

FIG. 2 is a block diagram showing a characteristic control structure in the second embodiment. As shown in FIG. 2, the control device 3 shown in the second embodiment is different from the control system shown in FIG.
5 is a hot water supply temperature decrease correction control unit 44 in addition to a hot water supply operation control unit 37 for controlling hot water supply operation, a simultaneous combustion monitoring unit 38 for monitoring simultaneous combustion, and a reheating operation control unit 40 for controlling reheating operation. And the combustion heat quantity increase control unit 45 during simultaneous combustion.
And is configured. The configurations of the hot water supply operation control unit 37, the simultaneous combustion monitoring unit 38, and the additional heating operation control unit 40 are the same as those of the hot water supply operation control unit 3 shown in the first embodiment.
7, has the same configuration as the configuration of the simultaneous combustion monitoring unit 38 and the reheating operation control unit 40, and a duplicate description thereof is omitted here.

The simultaneous combustion combustion calorie increase control unit 45 fetches the monitoring information of the simultaneous combustion monitoring unit 38 every moment, and when it is detected based on this monitoring information that the simultaneous combustion is being performed, it is more than in the hot water supply alone operation. By opening the valve opening of the proportional valve 8, the amount of combustion heat of the burner 3 is increased more than the amount of combustion heat in the hot water supply alone operation.

For example, the control unit 4 for increasing the amount of combustion heat during simultaneous combustion
5 fetches information on the amount of combustion heat of the burner 3 from the hot water supply operation control unit 37, and sets a value higher than the proportional valve driving current of the proportional valve 8 (current controlling the valve opening of the proportional valve 8) corresponding to the amount of combustion heat. The proportional valve driving current, which is increased by a predetermined current, is supplied to the proportional valve 8, and the valve opening of the proportional valve 8 is controlled in the opening direction to increase the amount of combustion heat of the burner 3 as compared with the hot water supply alone operation.

By this combustion heat quantity increase control, inevitably,
As the amount of heat received by the reheating heat exchanger 14 from the combustion flame increases, the amount of heat received by the hot water supply heat exchanger 10 from the combustion flame also increases, and the temperature of the hot water flowing out of the hot water supply heat exchanger 10 increases.

The hot water supply temperature drop correction control unit 44 takes in the operation information of the simultaneous combustion combustion heat amount increasing control unit 45, and when it detects that the combustion heat amount has been increased based on the operation information, as shown below. By controlling the valve opening degree of the bypass flow rate control means 26 in the opening direction, the rise in the hot water temperature at the outlet side of the hot water supply heat exchanger 10 raised by the above combustion heat amount increase control flows from the bypass passage 25 to the water supply passage 11. To compensate for the drop.

For example, a hot water supply side hot water temperature sensor 27 for detecting hot water temperature flowing out of the hot water supply heat exchanger 10 is provided as shown by a chain line in FIG.
Is determined by the calculation of V = K · (Tdy−Tst) (where K is a coefficient) for the drive source such as the gear motor of the bypass flow rate control means 26 based on the hot water temperature Tdy and the hot water supply set temperature Tst detected by The voltage V is supplied to control the valve opening of the bypass flow control means 26 in the opening direction.

It is to be noted that the simultaneous heating combustion heat quantity increase control section 45 controls the hot water supply heat exchanger 10 corresponding to the increased combustion heat quantity.
Flow rate control means 26 for compensating for the rise in the temperature of the hot water on the outlet side by the water flowing out of the bypass passage 25
Various methods other than the above may be considered as the control method of the valve opening degree. Here, any of these methods may be used to control the valve opening degree of the bypass flow control means 26.

According to this embodiment, the amount of burner combustion heat is increased at the time of simultaneous combustion as compared with the case of solely hot water supply operation.
Not only does the amount of heat received by the burner 4 from the combustion flame of the burner 3 increase, but also the hot water supply heat exchanger 10
Since the temperature of the water flowing through the hot water supply heat exchanger 10 also increases, the amount of heat absorbed by the reheater heat exchanger 14 from the hot water supply heat exchanger 10 increases due to the increase in the water supply temperature of the hot water supply heat exchanger 10, and the reheater heat exchanger By increasing both the amount of heat received from the combustion flame and the amount of heat received from the hot water supply heat exchanger 10, the amount of heat absorbed by the water passing through the reheating heat exchanger 14 is greatly increased, and the temperature of the bath is quickly increased. It is possible,
The time required for the bath to boil during simultaneous combustion can be suppressed from becoming longer.

Further, a configuration is provided in which the hot water temperature at the outlet side of the hot water supply heat exchanger 10 raised by the combustion heat amount increase control is reduced by controlling the valve opening of the bypass flow rate control means 26 in the opening direction. Therefore, even if the amount of combustion heat of the burner 3 increases compared to the hot water supply alone operation and the temperature of the hot water on the outlet side of the hot water supply heat exchanger 10 rises, the bypass passage reaches the hot water temperature at which the hot water of the set hot water supply temperature can be supplied. Since the temperature can be lowered by the water flowing out of the hot water 25, even if the amount of combustion heat of the burner 3 is increased as compared with the time of the hot water supply alone operation, the hot water at the hot water supply set temperature can be stably supplied.

Hereinafter, a third embodiment will be described. Characteristic features of this embodiment are, as shown in FIG. 3, a bypass passage 25 that connects the water supply passage 11 and the hot water supply passage 12 so as to bypass the hot water supply heat exchanger 10, and is provided in the bypass passage 25. In addition to the bypass flow rate control means 26 provided, a hot water side flow rate control means 34 is provided in the hot water supply passage 12 upstream of the connection portion X with the bypass passage 25, and the flow rate ratio as shown in FIG. The control means 46 is provided in the control device 35. The system configuration other than the above is the same as the system configuration in FIG.
In FIG. 3, the illustration is omitted, and the overlapping description is omitted.

The bypass flow rate control means 26 is provided with the second
It has the same configuration as the bypass flow rate control means 26 described in the embodiment, and is normally controlled to be in the closed state. The hot water flow rate control means 34 is a flow rate control valve which can variably control the flow rate Q of the hot water side where the water flowing out from the bypass passage 25 merges with the valve opening degree, and is the same as the bypass flow rate control means 26 described above. A drive source such as a gear motor for controlling the valve opening is provided, and is normally controlled to an open state.

The control device 35 shown in the third embodiment example
Has a configuration in which a flow rate ratio control means 46 is provided in place of the hot water supply temperature drop correction control section 44 described in the second embodiment, and the configuration other than the flow rate ratio control means 46 is the second configuration. The configuration of the control device 35 shown in FIG.
In the figure, control components other than the flow ratio control means 46 are not shown, and in this embodiment, a duplicate description of the common parts is omitted.

The flow ratio control means 46 fetches the operation information of the simultaneous heat combustion heat increase control section 45 from time to time. When it is detected from the operation information that the combustion heat increase control is being performed, the combustion heat increase control is performed. As a result, the hot water temperature at the outlet side of the hot water supply heat exchanger 10 is increased, so that the bypass flow rate control means 26 is controlled in the opening direction to flow the water from the bypass passage 25 into the hot water supply passage 12 and from the hot water supply heat exchanger 10 side. After the hot water temperature is lowered, the hot water flow rate control means 34 is controlled in the closing direction to reduce the hot water flow, and the hot water and the water flowing out of the bypass passage 25 into the hot water supply passage 12 are mixed. The flow ratio W between the hot water side flow rate Q and the bypass flow rate Qbp in the bypass passage 25 is controlled so that the hot water temperature becomes the hot water supply set temperature Tst.

Various methods are conceivable for controlling the flow ratio W between the hot water side flow rate Q and the bypass flow rate Qbp so that hot water at the hot water supply set temperature can be supplied. In this embodiment, various methods are considered. The flow ratio control may be performed using any of the above methods. An example of the flow control method will be described below.

For example, the amount of heat released from the hot-water supply heat exchanger 10 at the flow rate Q having the temperature Tdy to the set hot-water supply temperature Tst is received by the water having the flow-in temperature Qbp flowing out of the bypass passage 25 and having the input water temperature Tin. From the relationship of the thermal equilibrium balance, the hot water flow rate Q and the bypass flow rate Qbp after the hot water temperature after mixing the hot water flow rate Q and the bypass flow rate Qbp become the hot water supply set temperature Tst.
The target flow ratio Wst (Wst = Qbp / Q) can be obtained by the following equation (1).

Wst = (Tdy−Tst) / (Tst−Tin) (1)

From the above, a hot water supply-side hot water temperature sensor 27 for detecting the temperature of hot water flowing out of the hot water supply heat exchanger 10 is provided, and the hot-water temperature Tdy detected by the hot water supply-side hot water temperature sensor 27 is provided. The target flow ratio Wst based on the hot water supply set temperature Tst set by the remote controller 36, the water input temperature Tin detected by the water input thermistor 30, and the above equation (1).
Ask for.

Further, the following hot water flow rate detecting means capable of detecting the hot water flow rate Q is provided. For example, a hot water side flow rate detection sensor capable of detecting the flow rate of water flowing in the water supply passage 11 downstream of the connection portion Y with the bypass passage 25 is provided as hot water side flow rate detection means. Side flow rate Q is detected. Or, bypass passage 2
5, a bypass flow rate detection sensor capable of detecting the bypass flow rate Qbp is provided, and the bypass flow rate Qbp detected by the bypass flow rate detection sensor is subtracted from the total flow rate Qtl detected by the water flow rate sensor 28 to obtain a flow rate Q on the hot water side.
Hot water side flow rate detecting means for obtaining (Q = Qtl-Qbp) may be provided.

The total flow rate Q detected by the water quantity sensor 28
A flow ratio W between the hot water side flow rate Q and the bypass flow rate Qbp is detected based on tl and the hot water side flow rate Q detected by the hot water side flow rate detection means.

The target flow ratio Wsp obtained as described above,
Based on the detected flow ratio W, the drive source of the bypass flow control means 26 is supplied with the voltage V26 obtained by the calculation of V26 = α · (Wst−W) (α is a coefficient), The valve opening is controlled in the opening direction, and a voltage V34 determined by an operation of V34 = β · (Wst−W) (β is a coefficient) is supplied to the hot water side flow control means 34, and the valve of the hot water side flow control means 34 is controlled. Controls the opening in the closing direction.

When the amount of combustion heat of the burner 3 is controlled to increase during simultaneous combustion, the valve opening of the bypass flow control means 26 is controlled in the opening direction as described above, and the hot water flow control means 34 is controlled.
By controlling the valve opening degree in the closing direction to control the flow ratio W of the hot water side flow rate Q and the bypass flow rate Qbp, the hot water temperature can be controlled to approximately the hot water set temperature.

According to this embodiment, as in the case of the second embodiment, the amount of combustion heat of the burner 3 is increased during simultaneous combustion as compared to when the hot-water supply alone is operated. In addition, both the amount of heat received by the reheating heat exchanger 14 from the combustion flame of the burner 3 and the amount of heat received from the hot water supply heat exchanger 10 increase, and the amount of heat received by the reheating heat exchanger 14 through the water increases. The time required for boiling can be prevented from becoming long.

Further, in this embodiment, the bypass flow rate control means 26 and the hot water side flow rate control means 34 are provided, and when the control for increasing the amount of combustion heat is performed during simultaneous combustion, hot water at the set hot water supply temperature can be supplied. As described above, the valve opening degree of the bypass flow rate control means 26 is set in the opening direction,
4 is controlled in the closing direction to control the flow ratio of the hot water side flow rate Q to the bypass flow rate Qbp.
Hot water supply heat exchanger 1 by simultaneous combustion increase control
Even if the temperature of the hot water flowing from 0 rises, hot water at the hot water supply set temperature can be supplied stably and accurately by the flow rate ratio control. Further, the bypass flow rate control means 2
By controlling the respective valve openings of the hot water flow rate control means 6 and the hot water side flow control means 34, it is also possible to suppress fluctuations in the hot water supply amount.

It should be noted that the present invention is not limited to the above embodiments, and various embodiments can be adopted. For example, in the second and third embodiments, the bypass flow rate control means 26 is constituted by a flow rate control valve capable of continuously or stepwise variably controlling the valve opening. An electromagnetic valve or the like for controlling the passage 25 to be in an open state or a closed state may be provided as the bypass flow rate control means 26. In this case, the valve opening degree of the bypass flow rate control means 26 is controlled to be closed at normal times, and the bypass flow rate control means 2 is controlled by the hot water temperature decrease correction control section 44 during simultaneous combustion.
6 is opened, the temperature of the hot water having a flow rate Q on the hot water side that can be reduced to the hot water set temperature Tst by the water having the flow rate Qbp flowing out of the bypass passage 25 into the hot water supply passage 12 is determined, and the hot water flowing out of the hot water supply heat exchanger 10 is obtained. By increasing the combustion heat amount of the burner 3 by the simultaneous combustion combustion heat amount increasing control unit 45 so that the temperature becomes the above-determined hot water temperature, the boiling of the bath at the time of simultaneous combustion is delayed similarly to the above-described embodiments. Can be suppressed, and hot water at a hot water supply set temperature can be supplied.

In the second and third embodiments,
By the combustion heat amount increase control by the simultaneous combustion heat amount increase control unit 45, the combustion heat amount is increased by a predetermined amount of combustion heat compared with the hot water supply alone operation. However, the bypass flow rate control means 26 of the bypass passage 25 is controlled in the opening direction. The maximum amount of combustion heat that can control the temperature of the hot water after mixing the water flowing out of the bypass passage 25 and the hot water on the hot water side to the set hot water supply temperature is determined within a predetermined combustion heat amount. The combustion control of the burner 3 may be performed using the combustion heat quantity.

For example, when the bypass flow control means 26 is opened to a predetermined maximum valve opening, the hot water having the flow rate Q on the hot water side and the water having the bypass flow rate Qbp flowing out from the bypass passage 25 are mixed. The amount of combustion heat of the burner 3 required for the temperature to reach the hot water supply set temperature Tst is obtained. When the obtained amount of combustion heat is equal to or less than the maximum amount of combustion heat, the simultaneous combustion combustion heat amount increase control unit 45 controls the amount of combustion heat using the amount of combustion heat obtained above. And the bypass flow rate control means 26 is controlled to open to the maximum valve opening degree. When the calculated combustion heat amount is larger than the maximum combustion heat amount, the simultaneous combustion combustion heat amount increase control unit 45 controls the burner 3 at the maximum combustion heat amount. In addition to controlling the combustion, as described in the above embodiments, when the valve opening of the bypass flow rate control means 26 and the hot water side flow rate control means 34 are provided, The valve opening of the hot water side flow control means 34 is also controlled to prevent slowing down of the boiling of the bath and to supply hot water at the set hot water supply temperature during simultaneous combustion. .

Further, in the second and third embodiments, only one bypass passage 25 is provided, but a plurality of bypass passages may be provided. When an electromagnetic valve or the like capable of opening and closing the passages is provided as bypass flow control means in the plurality of bypass passages 25, the hot water supply passage 12 may be provided depending on the number of bypass flow control means that are open. The amount of flowing water can be variably controlled stepwise.

Further, in the second and third embodiments, the bypass flow rate control means 26 is normally in the closed state, but may be opened with a predetermined minute valve opening.

Further, in each of the above-described embodiments, the one-can two-channel water heater shown in FIG. 5 has been described as an example. However, the present invention is not limited to the one-can two-channel water heater shown in FIG. It can also be applied to vessels. For example, as shown by the chain line in FIG. 3, a continuous bypass passage having no open / close valve for connecting the water supply passage 11 and the hot water supply passage 12 to bypass the hot water supply heat exchanger 10 may be provided. A plurality of the constant bypass passages may be provided. As described above, when the constant bypass passage is provided, the hot water supply operation is controlled in consideration of the water flowing from the constant bypass passage into the hot water supply passage 12.

Although the one-can two-canal water heater shown in FIG. 5 has a hot-water supply function with a bath function, the present invention provides a one-can two-canal water system with a hot-water supply function other than the bath function. It is also possible to apply to the type. For example,
In addition to the above hot water supply function, the present invention can also be applied to a one-can-two-channel water heater with a heating function having a heating function as shown in FIG. In the appliance of FIG. 6, the non-hot water supply heat exchanger 48 is provided integrally with the hot water supply heat exchanger 10, and the tank is passed from the tank through the pump, the non-hot water supply side heat exchanger 8, the on-off valve, and the radiator. A non-hot water supply side circulation passage for circulating a heat medium (for example, ethylene glycol or propylene glycol) in the return path is formed. When performing heating, the on-off valve is opened to drive the pump, and the drive of the pump supplies the heat medium in the tank to the non-hot water supply side heat exchanger 48 via the pump. The heat medium flowing into the non-hot water supply side heat exchanger 48 is heated by the heat of the burner combustion flame, passes from the non-hot water supply side heat exchanger 48 to the radiator through the on-off valve, and is held by the radiator by the wind driven by the fan. To radiate heat to heat the wind, and heat the room by the hot wind. The heat medium radiated by the radiator returns to the tank. Although the appliance of FIG. 6 has the hot water supply system configuration shown in FIG. 5, the hot water supply system configuration is not shown in FIG.

As described above, when the present invention is applied to a water heater with a heating function, the conventional hot water supply operation is performed during simultaneous combustion in which both the heating operation on the non-hot water supply side operation and the hot water supply operation are performed. Is given priority, it is possible to avoid a problem of a decrease in the heating capacity such as a decrease in the temperature of the air for heating, and, of course, it is possible to supply hot water at a set hot water supply temperature.

[0071]

According to the structure provided with the simultaneous combustion combustion heat amount increase control unit, the simultaneous combustion combustion heat amount increase control unit increases the burner combustion heat amount in the simultaneous combustion compared to the single hot water supply operation. In addition to the increase in the amount of heat received by the non-hot water supply side heat exchanger or the reheating heat exchanger from the burner combustion flame, the temperature of hot water flowing through the hot water supply heat exchanger increases due to the increase in the amount of combustion heat, so the hot water supply heat exchanger Therefore, the amount of heat absorbed by the non-hot water supply side heat exchanger or the reheater heat exchanger also greatly increases, and the burner combustion with substantially the same amount of combustion heat as in the hot water supply alone operation due to the large increase in the amount of heat received by these heat exchangers. Compared with the case where the bath is performed, for example, the temperature of the bathtub water rises faster, so that it is possible to prevent the time required for the bath to boil longer.

Further, in addition to the above configuration, a bypass passage
In the apparatus provided with the bypass flow rate control means and the hot water supply temperature decrease correction control unit, the combustion heat amount increase control increases the combustion heat amount of the burner and the hot water temperature flowing out of the hot water supply heat exchanger increases. The bypass flow rate control means is controlled in the opening direction by the hot water supply temperature drop correction control unit, so that the rise in the hot water temperature on the outlet side of the hot water supply heat exchanger is corrected by the water flowing from the bypass passage into the hot water supply passage. It is possible to supply hot water at a set hot water supply temperature, and to avoid slowing down of boiling water in a simultaneous combustion, for example, and to stably supply hot water at a set hot water supply temperature. The effect can be obtained.

In the configuration having the bypass passage, the bypass flow rate control means, the hot water side flow rate control means, and the flow rate ratio control means in addition to the above-described simultaneous combustion combustion heat amount increase control section, Although the hot water temperature on the outlet side of the hot water supply heat exchanger rises due to the combustion heat amount increase control, the valve opening of the bypass flow rate control means is controlled in the opening direction, and the valve opening of the hot water flow rate control means is controlled in the closing direction. The flow rate of the bypass flow rate in the bypass passage and the flow rate of the hot water flow in a direction in which the hot water temperature after mixing the water flowing out of the bypass passage into the hot water supply passage and the hot water on the hot water side where the water flowing out of the bypass passage merges becomes the hot water supply set temperature. By controlling the ratio by the flow ratio control means, the hot water at the hot water supply set temperature can be supplied in the same manner as described above. The hot water set temperature can be obtained an effect that it is possible to stably supply.

The simultaneous combustion combustion heat amount increase control section controls the temperature of hot water after mixing the water flowing out of the bypass passage with the hot water on the hot water side in a state where the valve opening of the bypass flow control means is controlled in the opening direction. The maximum amount of combustion heat that can be controlled to the set temperature is determined within the range of the set amount of combustion heat, and the burner combustion control that uses the calculated amount of combustion heat is possible for simultaneous combustion. It is possible to perform the burner combustion with the combustion heat amount close to the predetermined maximum combustion heat amount of the burner as much as possible, or the maximum combustion heat amount, and it is possible to suppress the slowing of the boiling of the bath at the same time as the simultaneous combustion. The effect can be obtained.

In the case where the circulation pump capable of variably controlling the circulation flow rate of the reheating circulation passage and the simultaneous combustion circulation flow rate increase control unit are provided, the simultaneous combustion circulation flow rate increase Since the recirculation flow rate is controlled by the control unit to be increased by the circulation pump compared to the reheating alone operation, the amount of heat absorbed by the water flowing through the reheating heat exchanger from the hot water supply heat exchanger increases due to the increase in the recirculation flow rate. However, this makes it possible to prevent the time required for boiling the bath from becoming longer during simultaneous combustion.

As described above, the amount of heat absorbed from the hot water supply heat exchanger to the reheating heat exchanger due to the circulation flow rate increase control decreases the temperature of the hot water at the outlet side of the hot water supply heat exchanger. However, the control of the hot water supply operation immediately increases the burner combustion heat in order to compensate for the decrease in the hot water temperature at the outlet side of the hot water supply heat exchanger. Even if the temperature of the hot water on the outlet side of the vessel drops, the amount of combustion heat of the burner immediately increases and hot water at the hot water supply set temperature can be supplied.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a characteristic control configuration in a first embodiment.

FIG. 2 is a block diagram showing a characteristic control configuration in a second embodiment.

FIG. 3 is a model diagram extracting and showing characteristic system components in the third embodiment.

FIG. 4 is a block diagram showing a control configuration of a flow rate control unit which is characteristic in the third embodiment.

FIG. 5 is a model diagram showing an example of a one-can two-channel water heater.

FIG. 6 is a model diagram showing another example of the one-can two-channel water heater.

[Explanation of symbols]

 3 Burner 10 Hot water supply heat exchanger 11 Water supply passage 12 Hot water supply passage 14 Reheating heat exchanger 18 Circulation pump 21 Reheating heating circulation passage 25 Bypass passage 26 Bypass flow control means 34 Hot water side flow control means 41 Simultaneous combustion circulation flow increase control unit 44 Hot water temperature decrease correction control unit 45 Simultaneous combustion combustion heat amount increase control unit 46 Flow rate ratio control means

Claims (5)

[Claims] 1. A hot water supply heat exchanger for heating water supplied from a water supply passage to produce hot water and sending the hot water to the hot water supply passage, and a non-hot water supply side heat for heating a heat medium supplied through a non-hot water supply side circulation passage. The heat exchanger and the hot water supply heat exchanger and the non-hot water supply side heat exchanger are integrated, and a burner that burns and heats the integrated hot water supply heat exchanger and the non-hot water supply side heat exchanger in common is provided. In a one-can two-channel water heater that can perform a hot water supply operation of supplying hot water produced by a heat exchanger and a non-hot water supply side operation of heating a heat medium by a non-hot water supply side heat exchanger, a water supply passage and hot water supply are provided. A bypass passage connecting between the passages bypassing the hot water supply heat exchanger and communicating therewith; a bypass flow rate control means capable of variably controlling the flow rate of the bypass passage by a valve opening; and a hot water supply operation and a non-hot water supply side operation. Burner combustion heat during simultaneous combustion A simultaneous combustion combustion heat amount increase control unit for increasing the amount of combustion heat during the hot water supply alone operation to control burner combustion; and when the simultaneous combustion combustion heat amount increase control unit controls the burner combustion heat amount. By controlling the valve opening degree of the bypass flow rate control means in the opening direction, the rise of the water temperature at the outlet side of the hot water supply heat exchanger corresponding to the increase in combustion heat quantity by the combustion heat quantity increase control of the simultaneous combustion heat quantity increase control section. A hot water supply temperature decrease correction control unit for compensating for a decrease in water flow from the bypass passage to the hot water supply passage. 2. A hot water supply heat exchanger for heating water supplied from a water supply passage to produce hot water and sending the hot water to the hot water supply passage, and a heater for heating and reheating the bath water supplied through the reheating circulation passage. The heating heat exchanger, the above-mentioned hot water supply heat exchanger and the additional heating heat exchanger are integrated, and a burner for burning and heating the integrated hot water supply heat exchanger and the additional heating heat exchanger is provided. A water supply passage and a hot water supply passage in a one-can-two-water supply water heater capable of performing a hot water supply operation for supplying hot water produced by a heat exchanger and a reheating operation for reheating the bathtub water using a reheating heat exchanger. A bypass passage connecting between the bypass passages and bypassing the hot water supply heat exchanger; bypass flow rate control means capable of variably controlling the flow rate of the bypass passage by the valve opening; and performing both hot water supply operation and reheating operation During simultaneous combustion Is a simultaneous combustion combustion heat amount increasing control unit for increasing the combustion heat amount of the burner from the combustion heat amount in the hot water supply alone operation and performing burner combustion control; and controlling the burner combustion heat amount by the simultaneous combustion combustion heat amount increase control unit. When it is, the valve opening degree of the bypass flow rate control means is controlled in the opening direction, and the outlet side of the hot water supply heat exchanger corresponding to the combustion heat amount increase amount by the combustion heat amount increase control of the simultaneous combustion heat amount increase control unit is controlled. A two-channel hot water supply device comprising: a hot water supply temperature decrease correction control unit that corrects a rise in hot water temperature by water flowing from the bypass passage to the hot water supply passage. 3. A hot water supply heat exchanger for heating water supplied from a water supply passage to produce hot water and sending the hot water to the hot water supply passage, and a heater for heating bath tub water supplied through the reheating circulation passage to perform reheating. The heating heat exchanger, the above-mentioned hot water supply heat exchanger and the additional heating heat exchanger are integrated, and a burner for burning and heating the integrated hot water supply heat exchanger and the additional heating heat exchanger is provided. A water supply passage and a hot water supply passage in a one-can-two-water supply water heater capable of performing a hot water supply operation for supplying hot water produced by a heat exchanger and a reheating operation for reheating the bathtub water using a reheating heat exchanger. A bypass passage connecting between the bypass heat exchanger and the hot water supply heat exchanger; a bypass flow rate control means capable of variably controlling the flow rate of the bypass passage by the valve opening; and water flowing out of the bypass passage. Hot water to join -Side flow rate control means capable of variably controlling the flow rate on the side by the valve opening degree; in the simultaneous combustion in which both the hot water supply operation and the reheating operation are performed, the combustion heat amount of the burner is increased from the combustion heat amount in the hot water supply alone operation. A control unit for increasing the amount of combustion heat during simultaneous combustion, which controls combustion of the burner; controlling the valve opening of the bypass flow control means in the opening direction when the amount of combustion heat is controlled to increase by the control unit for increasing simultaneous combustion heat. Then, by controlling the valve opening degree of the hot water side flow control means in the closing direction, the hot water temperature after mixing the water flowing out of the bypass passage with the hot water side becomes a predetermined hot water supply set temperature. Flow rate control means for controlling a flow rate ratio between a bypass flow rate flowing through the bypass passage and a flow rate on the hot water side; 4. The simultaneous combustion combustion heat amount increase control section includes a water and hot water side flowing out of the bypass passage in a state where the valve opening of the bypass flow rate control means is controlled to open in accordance with the burner combustion heat amount increase control. The maximum amount of combustion heat that can control the temperature of hot and cold water after mixing with hot water to the set hot water supply temperature is determined within a predetermined combustion heat amount, and the burner combustion control is performed using the calculated combustion heat amount. The one-can two-channel water heater according to claim 1, 2 or 3. 5. A hot water supply heat exchanger for heating the water supplied from the water supply passage to produce hot water and supplying the hot water, and a reheating heat exchanger for heating and reheating the bath water supplied through the reheating circulation passage. The hot water supply heat exchanger and the reheating heat exchanger are integrated, and a burner for burning and heating the integrated hot water supply heat exchanger and the reheating heat exchanger in common is provided. In a one-can two-channel water heater that can perform a hot water supply operation of making hot water and supplying hot water of a predetermined hot water supply set temperature and a reheating operation of reheating the bathtub water by a reheating heat exchanger, A circulating pump capable of variably controlling the flow rate of the circulating hot water flowing through the reheating circulating passage; and a circulating pump for controlling the circulating flow rate of the reheating circulating passage by the circulating pump during simultaneous combustion in which both the hot water supply operation and the reheating operation are performed. A simultaneous-combustion circulating flow rate increase control unit for increasing the flow rate compared to a single-fired single operation.