JPH1163653A - One-drum and two-waterway type of hot water supply bath furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a one-drum and two-water passage type of hot water supply bath furnace which can let out hot water at a set temperature by the requested quantity from the hot water supply side even if it is operated simultaneously for hot water supply and reheating. SOLUTION: When the bath is in simultaneous service for hot water supply and reheating, the quantity of circulating water (the flow rate on reheating side) of a circulating pump is increased or decreased by feedback control so that the temperature may come to the set temperature for hot water supply, based on the temperature of hot water for delivery detected by a hot water delivery thermistor 29. For example, when the temperature of hot water for delivery falls under the set temperature, the quantity of heating on hot water supply side is increased relatively by decreasing the quantity of circulating water and lessening the calorific value absorbed on the side of reheating. Hereby, the simultaneous operation for hot water supply and reheating can be performed to the extent that it does not hinder the hot water supply side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for transferring heat from a burner to both water in a reheating channel in which water in a bathtub circulates and water in a hot water channel in which water is supplied. The present invention relates to a one-can, two-channel hot-water supply bath kettle provided with a circulation pump for circulating water in a bathtub through the reheating channel.

[0002]

2. Description of the Related Art Conventionally, a one-can, two-channel hot-water supply bath kettle is provided with a circulation pump for circulating water in a bathtub through a reheating channel through a heat exchanger. When performing the operation, the burner is ignited and the circulating pump is driven. Also,
When the operation was switched from the hot water supply alone operation or the reheating only operation to the simultaneous operation of the hot water supply and the reheating, the circulation pump was driven at a predetermined rated capacity.

[0003]

However, one can 2
In a canal-type hot water supply bath, if the hot water supply and the reheating of the bath are operated simultaneously, the heat generated by the burner is absorbed by both the reheating flow path and the hot water supply flow path. However, there has been a problem that hot water at the set temperature cannot be discharged from the hot water supply side by a required amount even when the burner is burned to the maximum.

[0004] The present invention has been made in view of such problems of the prior art. Even when the hot water supply and the reheating of the bath are operated simultaneously, only the required amount of hot water at the set temperature is supplied. It is an object of the present invention to provide a one-can, two-channel hot-water bath that can supply hot water from a hot-water supply side.

[0005]

The gist of the present invention to achieve the above object lies in the following inventions. [1] Reheating channel (3) in which water in bathtub (40) circulates
1) A heat exchanger (13) for transmitting heat from the burner (12) to both the water in the water and the hot water flow path (21) through which the water flows.
And water in the bathtub (40) to the reheating channel (3).
1) In a 1-can 2-channel water heater with a circulation pump (32) circulating through 1), the hot water supply channel (2
1) a hot water temperature detecting means (29) for detecting the temperature of hot water discharged through the hot water supply apparatus; and a circulating pump control means (51, 32a) for controlling a circulating water amount by the circulating pump (32). (51, 32a) is such that when the hot water supply and the reheating of the bath are used at the same time, based on the hot water temperature detected by the hot water temperature detecting means (29), the temperature becomes the hot water supply set temperature. A one-can-two-channel hot-water supply bath kettle characterized by increasing or decreasing the amount of circulating water by a circulation pump (32).

[2] When the operation is shifted from the hot water supply alone operation or the reheating alone operation to the simultaneous operation of the hot water supply and the reheating, the circulating water amount by the circulating pump (32) is once set to a predetermined minimum flow rate, and thereafter the hot water supply side is set. The one-can-two-channel hot-water supply bath kettle according to [1], wherein the circulating water amount is increased or decreased according to the tapping temperature of the hot water.

[3] The circulating pump control means (51, 3
2a) increases the circulating water amount when the required amount of hot water is supplied to the hot water supply side at the hot water supply set temperature, and increases the circulating water amount.
The one-can-two-drain type according to [1] or [2], wherein the amount of circulating water is reduced when the required amount of hot water is no longer supplied at the hot water supply set temperature to the hot water supply side even when 2) is burned to the maximum. Hot water bath kettle.

[4] The circulating pump control means (51, 3
2a), the required amount of hot water is no longer supplied to the hot water supply side at the hot water supply set temperature even if the circulating flow rate is limited to a preset minimum flow rate in a state in which the burner (12) is performing maximum combustion. At this time, the circulation pump (32) is stopped to temporarily stop the reheating operation [1],
The one-can, two-channel hot-water supply bath kettle according to [2] or [3].

The present invention operates as follows. The circulation pump control means (51, 32a) sets the temperature to the hot water set temperature based on the hot water temperature detected by the hot water temperature detection means (29) when the hot water supply and the reheating of the bath are used simultaneously. The amount of circulating water by the circulating pump (32) is increased or decreased so as to be as appropriate. For example, when the hot water temperature becomes lower than the set temperature, the amount of circulating water is reduced, the amount of heat absorbed by the reheating side is reduced, and the amount of heating on the hot water supply side is relatively increased. Thereby, the tapping temperature can be raised toward the set temperature.

Further, when the operation is shifted from the hot water supply alone operation or the additional heating operation to the simultaneous operation of the hot water supply and the additional heating, the circulating water amount by the circulation pump (32) is once set to a predetermined minimum flow rate, and thereafter, the water supply side is set. Increase or decrease the amount of circulating water according to the tapping temperature. When the operation shifts to the simultaneous operation, since the heat absorption amount on the reheating side is once set to be small, the hot water supply side is prioritized from the beginning, and the tapping temperature does not decrease at the start of the simultaneous operation.

In addition, when the reheating operation is switched from the single operation to the simultaneous operation, the circulating pump (32) is operated because the circulating water amount is controlled based on the tap water temperature after the circulating water amount is once reduced to the minimum flow rate. The control in the case where the operation is shifted from the single operation with no hot water supply to the simultaneous operation and the operation in the case where the operation with the additional heating alone is shifted to the simultaneous operation can be shared, and the simplification can be achieved.

The circulating pump control means (51, 32a)
When the required amount of hot water is being supplied to the hot water supply side at the hot water supply set temperature, that is, when the hot water supply is being performed and the combustion capacity still has a margin, the circulating water amount on the reheating side is increased. On the other hand, when the required amount of hot water is no longer supplied to the hot water supply side at the hot water supply set temperature even when the burner (12) is burned to the maximum, that is, the burner (12) has priority over the hot water supply side.
When it is necessary to distribute heat from the refueling side, reduce the amount of circulating water on the reheating side. Thereby, the time required for reheating can be reduced to the maximum within a range that does not hinder the hot water supply side.

Circulating pump control means (51, 32a)
When the required amount of hot water is not discharged to the hot water supply side at the hot water supply set temperature even if the circulation flow rate is limited to a predetermined minimum flow rate in a state in which the burner (12) is performing maximum combustion, the circulation pump (32) ) To stop the reheating operation temporarily. Thereby, the hot water supply side can be more preferentially heated.

By controlling the circulating water amount by the feedback control based on the hot water temperature as described above, for example, the margin of the number is obtained based on the hot water supply temperature, the hot water supply set temperature, and the hot water supply flow rate. In comparison with the case of performing feedforward control for setting the circulating water amount based on this and the bath-side incoming water temperature and the bath-side set temperature, there is no calculation error, etc., and the required amount of hot water can be reliably supplied at the hot water supply set temperature. It is possible to maximize the amount of circulating water within the range while tapping.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Each drawing shows an embodiment of the present invention. 1-can 2-canal hot-water bath kettle 10 according to the present invention
Has a function of supplying hot water to the faucet or pouring water into the bathtub 40, a function of reheating the hot water in the bathtub, and the like. FIG.
As shown in FIG. 1, a one-can two-channel hot-water supply bath kettle 10 includes a combustion chamber 11, a burner 12 is provided below the combustion chamber 11, and a heat from the burner 12 is provided above the combustion chamber 11. Heat exchangers 13 that transmit the heat to the water supply or the like are arranged.

The heat exchanger 13 has both a hot water supply pipe 21 for supplying hot water or pouring water, and a reheating circulating pipe 31 for circulating water in the bathtub for reheating. The heat exchanger 13 has a function of transmitting heat from the burner 12 to the fluid in both of the pipes 21 and 31 for heating.

A fixed bypass passage 2 is provided between a water supply side flow path 21a of the hot water supply pipe 21 toward the inlet side of the heat exchanger 13 and a hot water supply side flow path 21b extending from the outlet side of the heat exchanger 13.
2 and a bypass passage 24 in which a flow control valve (GM1) 23 is inserted. The hot water heated by the heat exchanger 13 is mixed with feed water through the fixed bypass passage 22 and the bypass passage 24, and the bypass ratio can be controlled by the flow control valve 23. A flow control valve (GM2) 25 for controlling the total flow rate of hot water and the bypass ratio is provided on the hot water supply pipe 21 on the hot water outlet side flow path 21b side.

Flow sensors 26a and 26b for detecting the presence or absence of water flow and the amount of water flow are provided near the inlet and outlet of the hot water supply pipe 21, respectively. In addition, near the inlet of the hot water supply pipe 21, a water input thermistor 27 for detecting the temperature (Tin) of the water supply, and near the outlet of the heat exchanger 13, the hot water temperature (Tout) after heating is detected. A hot water thermistor 28 for detecting a hot water temperature (Tmix) is attached near the outlet of the hot water supply pipe 21.

The recirculating pipe 31 for reheating includes a bath return pipe section 31a for returning water in the bathtub 40 to the heat exchanger 13;
A bath pipe section 31b for sending hot water heated by the heat exchanger 13 to the bathtub 40. Bath return pipe part 3
In the middle of 1a, a circulation pump 32 and a bath return pipe section 31
and a bath running water switch 33 for detecting the presence or absence of water flow in a. A bath temperature thermistor 34 for detecting the temperature of hot water flowing from the bathtub 40 is attached near the bath water switch 33.

A tapping-side flow path 21b of the hot-water supply pipe 21;
It is connected to the bath return pipe portion 31a by a pouring pipe 36 provided with a pouring solenoid valve 35, and the hot water supplied by the heat exchanger 13 is poured into the bathtub 40 through the pouring pipe 36. Is available.

The supply and exhaust of air are forcibly performed by blowing supply air from below the combustion chamber 11 by the combustion fan 14, and the exhaust is discharged from the upper portion of the combustion chamber 11. An ignition device 15 not shown in FIG. 1 is provided near the burner 12. The combustion gas supplied to the burner 12 is supplied to the gas solenoid valve 16 and the original gas solenoid valve 1.
7. On / off control is performed by the gas switching valve 18. Further, the amount of combustion gas supplied to the burner 12 is adjusted by a gas proportional valve 19. The gas proportional valve 19
Is controlled by the proportional valve current (i) supplied thereto.

FIG. 2 shows a circuit configuration of a control board included in the one-can-two-canal-water-type hot-water bath tub 10. The control board includes a CPU (Central Processing Unit) 51 that performs a central function of various controls. Various circuit devices are connected to the CPU 51 via various buses 52 such as a data bus and an address bus.

The ROM (read only memory) 53 is a read-only memory for storing programs executed by the CPU 51 and various fixed data. R
An AM (random access memory) 54 is a working memory for storing data temporarily required for executing a program.

The bus 52 is connected to an input / output interface circuit section 56 for inputting and outputting electric signals between the various circuit devices and the CPU 51, in addition to the main body operation section 55. Although not shown, a main remote controller and a bath remote controller are connected in addition to the main body operation unit 55. The input / output interface circuit unit 56 includes a flow sensor 26
a, 26b, various thermistors 27 to 29, 34, an ignition device 15, a combustion fan 14, various gas control valves 16 to 19,
A pump drive circuit 32a for driving the flow control valves 23 and 25, the pouring solenoid valve 35 and the circulation pump 32 is connected. In addition, various control devices are connected to the input / output interface circuit unit 56 as needed.

Next, the operation will be described. The one-can-two-channel hot-water supply bath kettle 10 according to the present embodiment uses the circulation pump 32 so that the required amount of hot water at the hot water supply set temperature (Tsp) can be discharged when the hot water supply and the reheating are simultaneously performed. The amount of circulating water on the side of the reheating circulation pipe 31 is adjusted. That is, in the case of simultaneous operation, the hot water supply side is prioritized over the reheating side, and the amount of heat absorption on the reheating side is adjusted so as not to hinder hot water supply. Here, the required amount is the amount of hot water in accordance with the opening degree of the faucet at the hot water destination, and actually indicates the amount of hot water in a state where the amount of hot water is not limited by the flow rate control valve (GM2) 25.

As shown in FIG. 3, when the operation is changed from the hot water single operation or the reheating only operation (step S101) to the simultaneous operation (step S102; Y),
First, it is checked whether or not the flow control valve (GM2) 25 is in a fully opened state (step S103). Flow control valve (GM2) 25
When the hot water at the set hot water supply temperature cannot be discharged even when the burner 12 is burned at the maximum capacity (input), the hot water supply temperature is narrowed down so as to give priority to the hot water temperature over the amount of hot water. Therefore, when the flow control valve (GM2) 25 is not fully opened, the required amount of hot water at the set hot water supply temperature cannot be supplied even though the burner 12 has already been burned with the maximum input.

In the case of the one-can-two-water-channel type, heat from the burner 12 is absorbed in both the flow path on the reheating side and the flow path on the hot water supply side. The amount of heat increases, and the amount of heat absorbed on the hot water supply side relatively decreases. Therefore, when the flow control valve (GM2) 25 is not in the fully open state (step S103; N), the reheating operation is interrupted and the operation is returned to the single hot water supply operation (to step S101), giving priority to the hot water supply side.

When the flow control valve (GM2) 25 is fully opened (step S103; Y), the required amount of hot water at the set hot water supply temperature is discharged, so that there is a possibility that the burner 12 still has room for combustion. is there. Therefore, it is determined that reheating can be performed in parallel with the hot water supply, and the circulating pump 32 is operated with an appropriate amount of circulating water (step S104). afterwards,
While operating the circulation pump 32 and performing the reheating operation in parallel with the hot water supply operation, the tapping temperature detected by the tapping thermistor 29 is monitored. When the hot water supply set temperature is equal to the hot water supply temperature or the hot water supply temperature is higher than the hot water supply set temperature (step S105; N), it is determined that there is still a sufficient combustion amount, and the circulating water amount by the circulation pump 32 is set to a predetermined amount (Δ
q) (step S106).

On the other hand, when the hot water temperature becomes lower than the hot water supply set temperature (step S105; Y), first, it is checked whether or not the burner 12 is burning at the maximum input (step S107). At this time (step S107; N), the input is increased (step S108). When the burner 12 is burning with the maximum input (Step S107; Y), the amount of circulating water by the circulation pump 32 is reduced by a predetermined amount in order to increase the amount of heat absorption on the hot water supply side (Step S110).
If the circulating water amount has already been reduced to the preset minimum value (step S109; Y), the reheating operation is interrupted and the operation returns to the hot water supply alone operation (to step S101).

As described above, the hot water supply temperature is monitored and the amount of circulating water on the reheating side is increased or decreased by feedback control so that the temperature does not fall below the set hot water supply temperature. Therefore, even during simultaneous operation of hot water supply and reheating, There is no decrease in the amount of hot water or the temperature of hot water.

Since the feedback control based on the hot water supply temperature is performed, the amount of circulating water on the reheating side is maximized within a range in which the required amount of hot water at the hot water supply set temperature can be supplied (a range that does not hinder the hot water supply side). It can increase the time required for reheating.

Further, even if the amount of circulating water is limited to the minimum flow rate, if the demand on the hot water supply side cannot be satisfied, the reheating operation is interrupted. For example, the circulating pump 32 is driven with the operable minimum power or less to degrade it. There is nothing.

FIGS. 4 and 5 show the operation shown in FIG. 3 in more detail. Here, the one-can-two-channel hot-water supply bath kettle 10 has a plurality of state modes, and the operation immediately after the start of the simultaneous operation differs depending on the state mode from which the simultaneous operation is started.

The state modes of the one-can-two canal type hot water supply bath kettle 10 include mode 1 to mode 4. Mode 4 of these
Is a state where the operation is stopped. Mode 1 is a state in which hot water may be stagnant in the heat exchanger 13 of the hot water supply pipe 21. For example, when there is no hot water supply operation and the reheating operation is performed, or only the reheating operation is performed. This corresponds to, for example, a state where the hot water supply operation has not been performed yet after the operation has been completed.

When the tapping of hot water is started from the state of mode 1 to the hot water supply side, there is a possibility that hot water at a temperature equal to or higher than the set hot water supply temperature will flow out, so in mode 1, the flow control valve (GM1) 2
3 is set to a predetermined opening degree, and when hot water starts, the bypass 2
4, a state is formed in which a large amount of low-temperature water is mixed from the beginning of hot water supply, thereby preventing hot water from flowing out.

Mode 3 corresponds to a period in which the flow control valve (GM1) 23, which has been waiting at a predetermined opening degree for lowering the tapping temperature, is gradually closed immediately after the tapping is started from mode 1. . Mode 2 is a flow control valve (GM1) 2
3 has been closed. This state corresponds to, for example, a state during the hot water supply alone operation, a simultaneous operation of hot water supply and reheating, or a state after stopping the hot water supply alone operation and before the reheating operation. The transition from mode 2 to mode 1
This is performed when the hot water supply operation is stopped from the simultaneous operation (that is, the reheating operation is started alone) or when the reheating operation is started from the hot water supply stopped state.

FIG. 4 shows a flow of the operation when the operation is shifted from the single operation of hot water supply (mode 2 or mode 3) to the simultaneous operation. When the bath automatic operation switch or the like is depressed in the state of the single hot water supply operation (step S201) and there is a reheating instruction (bath interruption) (step S202; Y), if the current state mode is mode 3, mode 2 (Step S203; N). Mode 3 is a period in which the flow control valve (GM1) 23 is gradually closed, so that the tapping temperature is not stable. Therefore, the flow control valve (G
M1) The reheating operation (control of the amount of circulating water) is started after waiting for the closing of 23 to be in the mode 2 state.

In the mode 2 (step S20)
3; Y), it is checked whether or not the flow control valve (GM2) 25 is in a fully open state (step S204). If it is not fully opened (step S204; Y), it is already in a state where the required amount of hot water at the hot water supply set temperature cannot be supplied even if the burner 12 is burned with the maximum capacity (input). Then, the hot water supply alone operation is left (step S2
01).

If the flow control valve (GM2) 25 is fully open (step S204; N), the circulating water amount of the circulating pump 32 is set to a predetermined minimum flow rate (qmin), and the reheating operation is started (step S204). Step S205). When the operation of the circulation pump 32 is started, and when the tapping temperature (Tmix) is lower than the hot water supply set temperature (Tsp) (step S2)
06; Y), it is checked whether the proportional valve current (i) is the maximum allowable proportional valve current (imax), that is, whether the input to the burner 12 is the maximum value (step S207). The current (i) is increased by Δi, and an attempt is made to increase the tapping temperature (Tmix) (step S20).
8). The proportional valve current (i) has already reached the maximum allowable proportional valve current (i
max), the circulation pump 32 is stopped (step S209), and the reheating operation is interrupted (step S20).
1).

If the tapping temperature (Tmix) does not fall below the set hot water supply temperature (Tsp) even when the circulation pump 32 is driven at the minimum flow rate (qmin) (step S206; N), there is still room for combustion capacity. Thus, the circulating water amount of the circulating pump 32 is increased by Δq (step S210). Thereafter, the tapping temperature (Tmix) is further monitored (step S21).
1) While the tap water temperature (Tmix) is not lower than the hot water supply set temperature (Tsp) (step S211; N), the circulating water amount is set to Δq until the maximum flow rate (qmax) of the circulating pump 32 is reached.
(Step S212, Step S213).

The outlet temperature (Tmix) is equal to the set hot water supply temperature (Ts).
(p) (step S211;
Y), it is checked whether or not the proportional valve current (i) is already the maximum value (imax) (step S214). If it is not the maximum value (imax) (step S214; Y), the proportional valve current (i) is set to △ i Then, the tapping temperature (Tmix) is increased (step S215).

On the other hand, the proportional valve current has already reached the maximum value (imax).
In the case of (1), the amount of circulating water of the circulating pump 32 is decreased by Δq (Step S217). However, when the circulating water amount has already been reduced to the minimum flow rate (qmin) (step S
216; N), and stops the circulation pump 32 (step S)
209), the reheating operation is interrupted (step S201)
What). By reducing the amount of circulating water in this way, the amount of heat absorbed on the reheating side is reduced, the amount of heat absorbed on the hot water supply side is relatively increased, and the outlet temperature (Tmix) is increased.

FIG. 5 shows a flow of the operation in the case where tapping to the hot water supply side starts during the additional heating alone operation.
During reheating alone operation (heat exchanger 13 of hot water supply pipe 21)
In the state of mode 1 in which hot water is stagnant in the part (step S301), when a hot water supply operation request (hot water supply interruption) occurs (step S302; Y), the state mode of the one-can-two-water-channel-type hot-water bath kettle 10 From the mode 1 to the mode 2 via the mode 3 (step S30).
3; Y), the circulation pump 32 is turned off (step S30)
4). Subsequent operations are the same as those in step S204 and subsequent steps in FIG. 4, and description thereof will be omitted.

As described above, when the hot water supply interrupt occurs during the reheating operation, the circulation pump 32 is once turned off.
The operation of step S305 and subsequent steps can be shared with the operation of step S204 and subsequent steps when a bath interruption occurs during the hot water supply alone operation, and control can be simplified.
Further, since the circulation pump 32 is gradually increased from the minimum flow rate (qmin) when shifting to the simultaneous operation, the tapping temperature (Tmix) does not suddenly drop at the start of the simultaneous operation, so that the tapping is comfortable. It can be performed.

Further, when the required amount of hot water at the set hot water supply temperature (Tsp) cannot be discharged even when the burner 12 is burned to the maximum, the amount of circulating water is reduced for the first time. Can be shortened to the maximum.

FIG. 6 shows a case in which, when a hot water supply interrupt occurs during the reheating alone operation, the circulating pump 32 is not once turned off, and the circulating water amount at the time of the hot water supply interrupt is used as an initial value to shift to the simultaneous operation control. The operation is shown. FIG.
5 are different from those in FIG. 5 in that step S304 for once turning off the circulation pump 32 and step S306 for initializing the amount of circulating water of the circulation pump 32 to the minimum flow rate (qmin).
To prevent the tapping temperature (Tmix) from decreasing due to reheating at the minimum flow rate (qmin) (step S
307 to step S309) and step S312 of increasing the circulating water amount by Δq from the minimum flow rate (qmin) are deleted. Also, when the opening of the flow control valve (GM2) 25 is not fully open (step S305; Y), the process of stopping the circulation pump 32 (step S310) is performed, and the other steps are different from those shown in FIG. It is the same.

If the required amount of hot water at the hot water supply set temperature (Tsp) can be supplied to the hot water supply side at the initial circulating water amount at the time of shifting to the simultaneous operation (step S30).
5; N), the reheating operation is continued while increasing or decreasing the circulating water amount within a range that does not hinder the hot water supply side (step S31).
3 to step S319). On the other hand, when the required amount of hot water at the hot water supply set temperature (Tsp) cannot be supplied to the hot water supply side at the initial circulating water amount at the time of shifting to the simultaneous operation (step S305; Y), the circulating pump 32 is stopped. (Step S310), and temporarily shifts to the hot water supply alone operation (Step S311). As described above, once the operation shifts to the hot water supply independent operation, the operation shown in FIG. 4 is performed thereafter, and the reheating operation is performed within a range where the hot water supply side is not hindered.

In the embodiment described above, the amount of increase / decrease △ q per cycle of the circulating water amount and the amount of increase / decrease △ i per cycle of the proportional valve current (i) are set to constant values. You may make it. For example, tapping temperature (Tmi
The magnitudes of △ q and △ i may be set according to the deviation between x) and the hot water supply set temperature (Tsp).

[0049]

According to the one-can-two-channel hot-water supply bath kettle of the present invention, when hot water supply and reheating of the bath are used simultaneously, the temperature is set based on the detected hot water temperature. Since the amount of circulating water by the circulating pump is increased or decreased by feedback control so as to reach a temperature, simultaneous operation of hot water supply and reheating can be performed without disturbing the hot water supply side. The time required for firing can be reduced to the maximum.

Further, when the operation is shifted from the hot water supply alone operation or the additional heating operation to the simultaneous operation of the hot water supply and the additional heating, the amount of circulating water by the circulation pump is once set to a predetermined minimum flow rate, and thereafter, according to the outlet temperature on the hot water supply side. In the case of increasing or decreasing the circulating water amount, the hot water supply side is prioritized from the beginning, and it is possible to prevent the tapping temperature from temporarily lowering at the start of the simultaneous operation. In addition, even when the operation shifts from reheating alone to simultaneous operation, once the circulating water volume is reduced to the minimum flow rate, the circulating water volume is controlled based on the tap water temperature. In this case, the control in the case of shifting to the reheating operation and the case of shifting from the reheating alone operation to the simultaneous operation can be shared, and the simplification can be achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a one-can, two-way hot water supply bath kettle according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of a control board included in a one-can, two-channel hot-water supply bath kettle according to an embodiment of the present invention.

FIG. 3 is a flowchart showing a flow when the flow rate of the circulation pump is controlled by the one-can-two-channel hot-water supply bath kettle according to one embodiment of the present invention during the simultaneous operation of hot water supply and reheating.

FIG. 4 is a flowchart showing a flow of flow control of a circulation pump performed when the one-can-two-channel hot-water supply bath kettle according to the embodiment of the present invention shifts from hot-water supply alone operation to simultaneous operation with reheating. .

FIG. 5 is a flow chart showing a flow of flow control of a circulation pump performed when the one-can-two-channel hot-water supply bath kettle according to the embodiment of the present invention shifts from reheating alone operation to simultaneous operation with hot water supply. .

FIG. 6 shows another example of the flow of the flow control of the circulating pump performed when the one-can-two-channel hot-water supply bath kettle according to one embodiment of the present invention shifts from the additional heating alone operation to the simultaneous operation with hot water supply. It is a flowchart shown.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... 1 can 2 canal type hot water supply bath kettle 11 ... Combustion chamber 12 ... Burner 13 ... Heat exchanger 14 ... Combustion fan 19 ... Gas proportional valve 21 ... Hot water supply pipe 22 ... Fixed bypass 23 ... Flow control valve (GM1) 24 ... Bypass path 25 ... Flow control valve (GM2) 26a, 26b ... Flow sensor 27 ... Incoming thermistor 28 ... Heat exchange thermistor 29 ... Tapping thermistor 31 ... Circulation pipe for reheating 32 ... Circulation pump 33 ... Bath water switch 34 ... Bath temperature Thermistor 35: Pouring solenoid valve 36: Pouring pipe 40: Bathtub

Claims (4)

[Claims] 1. A heat exchanger for transferring heat from a burner to both water in a reheating channel in which water in a bathtub circulates and water in a hot water supply channel through which water is supplied, and the water in the bathtub is supplied to the heat exchanger. In a 1-can 2-channel water heater with a circulation pump that circulates through a reheating channel, a tap water temperature detecting means for detecting a temperature of hot water discharged through the hot water supply channel, and a circulating water amount controlled by the circulation pump is controlled. Circulating pump control means, wherein when the hot water supply and the reheating of the bath are used at the same time, the circulating pump control means supplies the hot water based on the hot water temperature detected by the hot water temperature detecting means. A one-can, two-channel hot-water supply bath kettle wherein the amount of circulating water by the circulating pump is increased or decreased so as to reach a set temperature. 2. When the operation is switched from the hot water supply alone operation or the additional heating operation to the simultaneous operation of the hot water supply and the additional heating, the circulating water amount by the circulating pump is once set to a predetermined minimum flow rate, and then the outlet temperature on the hot water supply side is set. 2. The one-can, two-channel hot-water supply bath kettle according to claim 1, wherein the circulating water amount is increased or decreased according to the amount of the circulating water. 3. The circulating pump control means increases the circulating water amount when the required amount of hot water is supplied to the hot water supply side at the hot water supply set temperature, so that the required amount of hot water is supplied to the hot water supply side even when the burner is burned to the maximum. The one-can-two-channel hot-water supply bath pot according to claim 1 or 2, wherein the amount of circulating water is reduced when hot water is no longer supplied at the set hot water supply temperature. 4. The circulation pump control means supplies a required amount of hot water to a hot water supply side even when the circulation flow rate is limited to a predetermined minimum flow rate in a state where the burner is performing maximum combustion. The one-tank two-channel hot-water supply bath kettle according to claim 1, 2 or 3, wherein when the hot water is no longer supplied, the circulation pump is stopped and the reheating operation is temporarily stopped.