JP2001153457A - Bath furnace device provided with hot water supply function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bath furnace device provided with a hot water supply function which relaxes boiling sound or thermal stress occurring due to overheat condition of the hot water within a heat exchanger for hot water supply, and lessens the drop of bath additional stalking operation, the delay of boiling, etc., and further does not perform the draining more than necessary into a bathtub. SOLUTION: In a device, which heats a heat exchanger 21 for additional heating of a bath and a heat exchanger 31 for hot water supply with one burner 11 and can fill a bathtub 40 with hot water heated with the heat exchanger 31 for hot water supply via a bath additional heating circulation path 20 from a bath automatic hot water supply path 35, a control valve 71 (66) capable of adjustment of flow rate is provided in the bath automatic hot water supply path 35, while a means for directly or indirectly detecting the temperature of hot water within the heat exchanger 31 for hot water supply is provided, and when the temperature of the hot water within the heat exchanger 31 comes to a high temperature above a reference temperature, the control valve 71 (66) is opened to adjust the flow rate, whereby the hot water within a hot water supply circuit 30 is discharged to the side of the bath tub 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bath kettle apparatus having a hot water supply function, and more particularly to a one-can-two-circuit type in which a heat exchanger for hot-water supply and a heat exchanger for hot water supply are heated by one burner. The present invention relates to a bath kettle device having a hot water supply function.

[0002]

2. Description of the Related Art In a one-can, two-circuit type bath kettle apparatus having a hot water supply function sharing a burner, when a bath reheating operation is performed alone, heat for hot water supply provided in the same can body is used. As a result of the exchanger being heated without water flow, the temperature rises excessively, causing problems such as generation of boiling noise and generation of thermal stress. For this reason, conventionally, the temperature in the heat exchanger for hot water supply was monitored, and when the temperature reached a certain temperature or higher, the bath reheating operation was temporarily stopped or the combustion input of the burner was reduced. . Also, the applicant of the present application is disclosed in
In No. 9801, when the temperature in the heat exchanger for hot water supply becomes higher than a certain temperature, a bath for one-circuit and two-circuit water supply function, in which a certain time or a certain amount of water is dropped from the hot water supply circuit and dropped into the bathtub through a passageway. Equipment is provided.

[0003]

However, in order to prevent the temperature of the hot water in the heat exchanger for hot water / hot water supply from rising excessively as in the prior art, the bath reheating operation is temporarily stopped or the burner is turned off. In the method of reducing the combustion input, on the contrary, there is a problem that the output of the reheating of the bath is not sufficient. When the temperature of the hot water in the heat exchanger for hot water supply becomes equal to or higher than a certain temperature, a certain amount of time or a certain amount of water is drained. Not always possible. In addition, the temperature of the hot water in the hot water supply heat exchanger is lowered more than necessary by drainage, so that the burner burns a large amount of heat, thereby reducing the amount of combustion heat supplied to the heat exchanger for bath reheating. Problems arise. Further, when the amount of released water is set to be large, there is a problem that more water than necessary is discharged into the bathtub.

Accordingly, the present invention solves the above-mentioned drawbacks of the conventional bath kettle apparatus having a hot water supply function, and the hot water in the hot water / hot water supply heat exchanger becomes overheated when the bath reheating operation is performed alone. To reduce the generation of boiling noise and the thermal stress generated in the heat exchanger for hot water supply,
It is possible to reduce the drop in output during bath reheating operation and the drop in reheating efficiency such as delay in boiling, so that the bath reheating operation can be performed efficiently, and furthermore, there is no unnecessary drainage in the bathtub. An object of the present invention is to provide a bath kettle device with a hot water supply function that can prevent such a situation.

[0005]

Means for Solving the Problems To solve the above-mentioned problems, a bath kettle apparatus with a hot water supply function of the present invention is designed so that a heat exchanger for hot-water bath heating and a heat exchanger for hot water hot water supply are heated by one burner. A 1-can 2-circuit type bath water heater with a hot water supply function, wherein hot water heat-exchanged by the hot water / hot water supply heat exchanger is supplied to a bath reheating circuit through a bath automatic hot water supply path of a hot water supply circuit. In a device in which hot water can be filled in a bathtub by dropping, a control valve capable of adjusting a flow rate is provided in the bath automatic hot water supply path, while a hot water temperature in the hot water hot water supply heat exchanger is directly or indirectly controlled. When the temperature of the hot water in the heat exchanger for hot water supply becomes higher than a certain reference temperature, the control valve is opened to adjust the flow rate and the hot water in the hot water supply circuit is discharged to the bathtub side. The first thing that was configured to It is a symptom. Further, the bath kettle device with a hot water supply function of the present invention has, in addition to the first feature, a second feature that the discharge flow rate by the hot water filling valve is changed according to the degree of the temperature exceeding the reference temperature. The third feature of the bath kettle device with a hot water supply function of the present invention is that, in addition to the first or second feature, a temperature sensor for directly detecting a hot water temperature in the hot water / hot water supply heat exchanger is provided. I have. Further, in addition to the first or second feature, the bath kettle device with a hot water supply function of the present invention may further include: a hot water temperature in the hot water / hot water supply heat exchanger; A fourth feature is that the temperature is estimated from the temperature detected by the sensor and the amount of heat of combustion in the burner. Further, in addition to the first or second feature, the bath kettle device with a hot water supply function of the present invention may further include: a hot water temperature in the hot water / hot water supply heat exchanger; The fifth feature is that the temperature is estimated from the temperature detected by the sensor, the temperature detected by the circulation forward path temperature sensor provided in the circulation forward path of the bath additional heating circulation path, and the amount of heat of combustion in the burner.

According to the first feature, when the temperature of the hot water in the heat exchanger for hot water supply becomes equal to or higher than a predetermined reference temperature, the control valve capable of adjusting the flow rate is opened to pass through the control valve. The hot water in the hot water supply circuit is discharged to the hot water circulation circuit. Therefore, the hot water in the hot water / hot water supply heat exchanger is replaced by an amount corresponding to the flow rate of the drainage, thereby preventing the hot water from being overheated. The reference temperature is, for example, 9
An appropriate temperature for preventing overheating, such as 0 ° C. or 95 ° C., which may cause boiling or thermal stress, is determined in advance by experiment and stored in a controller or the like. The control valve is not a simple on-off valve, but is capable of adjusting the flow rate, so that the amount discharged to the bathtub side via the control valve is reduced as much as possible, and the hot water in the hot water / hot water supply heat exchanger is overheated. It is also possible to adjust the discharge flow rate so that the state can be prevented. that's all,
According to the first feature, the temperature of the hot water in the heat exchanger for hot water supply exceeds the reference temperature without temporarily stopping the bath reheating operation or reducing the combustion input of the burner, resulting in an overheating condition. Can be prevented or reduced due to the high temperature of the steel and the generation of boiling noise and thermal stress. Moreover, by using a control valve capable of adjusting the flow rate, it is possible to prevent the amount of drainage discharged into the bathtub from the bath reheating circuit from becoming unnecessarily large. In addition, since it is possible to adjust so that wastewater is not drained more than necessary, it is possible to prevent the heat exchanger for hot water and hot water from being taken away more than necessary, and more combustion heat is used for reheating the bath. It becomes possible to participate in the heat exchanger.

According to the second feature, in addition to the operation and effect of the first feature, when the temperature in the heat exchanger for hot water supply becomes higher than the reference temperature, the control valve is opened. The degree of release can be set to a degree corresponding to the degree of temperature exceeding the reference temperature. That is, as the temperature of the hot water in the heat exchanger for hot water supply becomes higher than the reference temperature, the degree of opening increases and the discharge flow rate increases,
If the temperature is slightly higher than the reference temperature, the discharge flow rate is reduced. As a result, it is possible to perform the discharge with a minimum amount of drainage required to make the temperature of the hot water in the heat exchanger for hot water supply to be equal to or lower than the reference temperature, and to more appropriately reduce the amount of discharge into the bathtub. The amount of heat deprived in the heat exchanger for hot water and hot water supply can be reduced, and the amount of heat applied to the heat exchanger for reheating the bath can be increased more effectively. In the above, as a method of changing the discharge flow rate by the control valve according to the degree of the temperature exceeding the reference temperature, one or more temperatures exceeding the reference temperature are determined in stages, and when each temperature is reached, the control is performed stepwise. The valve opening can be increased. Further, the opening of the control valve may be increased or decreased in a stepless manner in proportion to an increase or decrease in the temperature exceeding the reference temperature. Of course, when the temperature rises and reaches the reference temperature, the control valve is opened. However, the once opened control valve may be closed at a constant temperature slightly lower than the reference temperature. As described above, according to the second feature, by changing the discharge flow rate by the control valve in accordance with the degree of the temperature exceeding the reference temperature, it is necessary and sufficient according to the temperature of the hot water in the hot water supply heat exchanger exceeding the reference temperature. The drainage can be performed more reliably, the inconvenience due to the overheating of the hot water in the heat exchanger for hot water supply is sufficiently eliminated, and the amount of drainage to the bathtub is further reduced to the minimum necessary. A decrease in the amount of heat applied can be more preferably suppressed.

According to the third aspect, in addition to the function and effect of the first or second aspect, a temperature sensor can be provided to directly detect the temperature of the hot water in the hot water / hot water supply heat exchanger. The control valve can be driven by accurately detecting the temperature of hot water in the heat exchanger for hot water supply in the bathtub.

According to the fourth aspect, in addition to the function and effect of the first or second aspect, the detection of the temperature of the hot water in the heat exchanger for supplying hot water and hot water is provided in the circulation return path of the bath reheating circuit. Since the temperature is estimated from the temperature detected by the temperature sensor and the amount of combustion heat of the burner, a temperature sensor for detecting the temperature of the hot water in the hot water / hot water supply heat exchanger is not required. The detection of the temperature of the hot water in the heat exchanger for hot water and hot water supply from the temperature detected by the temperature sensor provided in the circulation return path of the bath reheating circuit and the amount of combustion heat of the burner is performed in advance by an experiment, Obtain the relationship between the temperature of the circulation return path from the bathtub to the heat exchanger for bath reheating, the heat of combustion of the burner, and the temperature of the hot water in the heat exchanger for hot water and hot water supply. The relationship between the temperature and the temperature of the hot water in the hot water / hot water supply heat exchanger can be stored in a controller or the like using a relational expression or a table.

According to the fifth aspect, in addition to the function and effect of the first or second aspect, the detection of the temperature of the hot water in the hot water / hot water supply heat exchanger is performed in the circulation return path of the bath additional heating circuit. By estimating from the temperature detected by the provided temperature sensor, the temperature detected by the temperature sensor provided on the circulation forward path of the bath reheating circuit, and the amount of combustion heat of the burner, the hot water in the hot water supply heat exchanger can be estimated. There is no need for a temperature sensor to detect temperature. In addition, it is possible to obtain the circulation flow rate of the bath reheating circuit from the detection temperature of the circulation return path and the detection temperature of the circulation outward path, and it is possible to estimate the hot water temperature in the hot water hot water supply heat exchanger for each circulation flow rate. Accurate temperature estimation and drainage control are possible. The bath reheating cycle is performed by a circulation pump provided in the bath reheating circuit, but since the capacity of the circulation pump is normally not switched, the circulation flow rate is basically constant. The circulation flow rate may vary depending on the length and the like. Also, in the case of a circulating pump capable of switching the capacity, the circulating flow rate naturally differs depending on the switching. The hot water temperature in the hot-water / hot-water supply heat exchanger varies depending on the amount of circulation in the bath reheating circuit, even if the detected temperature and the amount of combustion heat in the other circulation return paths are the same.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a bath kettle device with a hot-water supply function according to an embodiment of the present invention, FIG. 2 is a flow chart for controlling drainage by a hot-water valve showing an example of the embodiment of the present invention, and FIG. Fig. 4 is a diagram for explaining a method for estimating the temperature of hot water in a heat exchanger for supplying hot water and hot water, Fig. 4 is a flowchart for controlling drainage by a hot water valve, showing another example of the embodiment of the present invention, and Fig. FIG. 8 is a diagram for explaining another method of estimating the temperature of hot water in the heat exchanger for hot water supply without using the hot water. FIG. 6 is a flow chart for controlling drainage by a hot water valve, showing still another example of the embodiment of the present invention.

Referring to FIG. 1, first, the overall configuration of a bath kettle apparatus with a hot water supply function will be described. Reference numeral 10 denotes a can body, in which combustion by a gas burner 11 is performed. The gas burner 11 may be another type of burner such as an oil burner. Air is supplied from the blower 12 for the combustion of the burner 11. In the upper part of the can body 10, a heat exchanger 21 for hot water heating in the hot water recirculation circuit 20 and a heat exchanger 31 for hot water hot water supply in the hot water hot water supply circuit 30 are arranged. The vessels 21 and 31 are also used by one gas burner 11 and are heated.

A bath reheating circuit 20 is a circulation recirculation path 22 for guiding hot water from the can 10 (bath reheating heat exchanger 21) to the bathtub 40 in addition to the bath reheating heat exchanger 21.
And a circulation return path 23 for guiding warm water from the bathtub 40 to the can body 10 (heat exchanger 21 for post-bath heating). The circulation forward path 22 and the circulation return path 23 are connected to a bath 40 via a circulation fitting 41. The circulation return path 23 includes a water flow switch 51, a bath temperature sensor 52, and a bath water level sensor 53.
And a circulation pump 54 are provided. In addition, 55 is a bypass for short-circuiting the circulation forward path 22 and the circulation return path 23, 56 is a three-way switching valve, and 57 is a drain plug.

The hot water supply circuit 30 includes, in addition to the heat exchanger 31 for hot water supply, an inlet 32 for guiding water from a water supply such as a water supply to the can 10 (heat exchanger 31 for hot water supply),
The hot water supply system includes a hot water supply path 33 for discharging hot water heated by the (hot water supply heat exchanger 31), a general hot water supply path 34 branched from the hot water supply path 33, and an automatic bath water supply path 35. The water inlet passage 32 is provided with a water flow sensor 61 and a water temperature sensor 62. The heat exchanger 31 for hot water supply is provided with a hot water temperature sensor 63 in the heat exchanger for detecting the temperature of the hot water in the exchanger 31. Numeral 64 denotes an embers safety device. Also, a tapping temperature sensor 65 is provided in the tapping path 33.
And an overflow prevention adjustment valve 66 are provided. Note that 67
Is a bypass between the water inlet channel 32 and the hot water channel 33, and a bypass flow rate control valve 68 is provided. A hot water supply temperature sensor 69 is provided downstream of the junction of the bypass 67 with the hot water discharge passage 33.

In the middle of the bath automatic hot water supply passage 35, there is provided a hot water filling valve 71 which is a control valve capable of adjusting a flow rate. Downstream, a drop flow rate detection sensor 72 and a check valve 73 are provided. 74 is a vacuum breaker.

Reference numeral 80 denotes a controller of the apparatus, and 81 denotes a remote controller. The remote controller 81 may be composed of a plurality of remote controllers such as a remote controller for bath operation and a remote controller for hot water supply operation. The controller 80 inputs information from a sensor provided in each section of the apparatus, and receives a command from the remote controller 81, and issues a predetermined operation command to each section of the apparatus by built-in software.

When the bath reheating operation is commanded by the remote controller 81 while the main operation switch of the apparatus is turned on, the controller 80 first drives the circulation pump 54. And the water flow switch 5
When 1 detects the minimum operating water amount or more, the combustion of the gas burner 11 is started. The bath water is circulated through the can 10 and is heated in the bath reheating heat exchanger 21 to reheat the bath. When the bath temperature sensor 52 detects a predetermined bath set temperature, the operation is terminated. When the main operation switch of the apparatus is turned on, the general hot water supply path 3
When Curran No. 4 is opened, water is supplied through the water inlet passage 32, and when the incoming water flow sensor 61 detects the minimum operating water amount or more, the controller 80 burns the gas burner 11. The hot water that has been supplied from the hot water supply path 33 to the general hot water supply path
General hot water is passed through. In addition, when the bath automatic dropping operation is commanded by the remote controller 81 while the main operation switch of the apparatus is turned on, the controller 80 opens the hot water filling valve 71 fully or at a constant opening. Thus, when the incoming water flow rate sensor 61 detects the minimum operating water amount or more, the gas burner 11 is burned, and the hot water discharged from the hot water supply path 33 passes through the bath automatic hot water supply path 35, enters the bath reheating circuit 20, and further enters the circulation outward path. It is dropped into the bathtub 40 by the two conveyances from the 22 and the circulation return path 23.
When the set flow rate is dropped and the flow rate detection sensor 72 detects the set flow rate, the operation is terminated.

In the above-described mechanism and function of the apparatus, when the bath reheating operation is performed alone, in the hot-water / hot-water supply heat exchanger 31 in which the operation is not performed, the water is in a stopped state where there is no water flow. Since the hot water is heated as it is, the temperature of the hot water may be increased to a very high temperature. Also, the temperature of the hot water in the hot water / hot water supply heat exchanger 31 may be raised to a very high temperature in an overheated state due to the after-boiling phenomenon that occurs after the stop of the hot water / hot water supply operation. Also, due to other unexpected circumstances, the temperature of the hot water in the hot water / hot water supply heat exchanger 31 may be increased to a high temperature. If the temperature of the hot water in the hot-water / hot-water supply heat exchanger 31 continues to rise, it will eventually be overheated, causing boiling noise and thermal stress due to boiling.

Therefore, in order to prevent inconvenience due to the overheating of the hot water in the hot water / hot water supply heat exchanger 31, means for directly or indirectly detecting the temperature in the hot water / hot water supply heat exchanger 31 is provided. And a heat exchanger 3 for hot water supply
When the temperature in the hot water supply system 1 becomes equal to or higher than a predetermined reference temperature, the hot water filling valve 71 is opened so that the flow rate can be adjusted, and the hot water in the hot water supply circuit is discharged to the bathtub side so as to be a necessary minimum. The temperature of the hot water in the heat exchanger is kept below the reference temperature.

Referring to FIG. 2, heat exchanger 31 for hot water supply is provided.
Control of drainage by the filling valve 71 when directly detecting the hot water temperature in the inside using the hot water temperature sensor 63 in the heat exchanger will be described. Now, when the bath reheating switch is turned on by the remote controller 81 (YES in step S1), the controller 80 drives the circulation pump 54, and when the water flow switch 51 is turned on, the combustion of the gas burner 11 is started. The reheating cycle of the bath is started (step S2). The controller 80 detects the hot water temperature in the hot water / hot water supply heat exchanger 31 with the heat exchange internal hot water temperature sensor 63 (step S3), and further checks whether the detected temperature T is higher than a predetermined reference temperature T _S. Monitoring is performed (step S4), and when this is the case (yes in step S4), control of the filling valve 71 is started (step S4).
5). When the temperature falls below the reference temperature T _S (step S
Then, the control of the filling valve 71 ends (step S5). How to control the filling valve 71 will be described later.

Next, a method for estimating and detecting the temperature of the hot water in the hot water / hot water supply heat exchanger 31 with or without the heat exchange internal hot water temperature sensor 63 will be described with reference to FIG. In the case of the one-can two-circuit system, the rise of the hot water temperature in the hot water / hot water supply heat exchanger 31 when the bath reheating operation is performed alone is caused by the temperature of the circulation return path 23 and the circulation flow rate of the bath reheating circulation path 20. , The amount of heat of combustion by the burner 11. That is, when the temperature of the circulation return path 23 increases,
The hot water temperature in the hot water / hot water supply heat exchanger 31 increases. In addition, the smaller the circulation flow rate, the higher the temperature of the hot water in the hot water / hot water supply heat exchanger 31 tends to be. Now, assuming that the circulation flow rate of the circulation pump 54 is constant and the bath reheating operation is performed with a certain amount of combustion heat, the relationship between the temperature of the circulation return path 23 and the hot water temperature in the hot water / hot water supply heat exchanger 31 is as follows. The relationship is as shown in FIG. That is, the temperature of the circulating return path 23 rises with the lapse of time, at a constant temperature T ₁ of where that temperature, hot water temperature in the heat for hot water heating exchanger 31 becomes the reference temperature T _S. Therefore, in a device in which the circulating flow rate in the bath reheating operation is actually constant or can be considered to be constant, an experiment is performed in advance to determine the circulating return path 23 for each combustion heat amount at the constant circulating flow rate. By obtaining a relationship between the temperature (the temperature detected by the bath temperature sensor 52) and the temperature of the hot water in the hot water / hot water supply heat exchanger 31, and storing this in a relational expression or a table in the controller 80, the hot water / hot water supply is possible. The hot water temperature in the heat exchanger 31 for use can be estimated and detected.

Referring to FIG. 4, an example in which the hot water temperature in the hot water / hot water supply heat exchanger 31 is estimated and detected from the temperature detected by the bath temperature sensor 52 and the amount of combustion heat to control the hot water filling valve 71 will be described. Now, when the bath reheating switch is turned on by the remote controller 81 (Yes in step S11), the controller 80 drives the circulation pump 54, and when the water flow switch 51 is turned on, the combustion of the gas burner 11 is started. The reheating cycle of the bath is started (step S12). The controller 80 detects the temperature of the hot water in the circulation return path 23 by the bath temperature sensor 52 (step S13). Further, based on the detected temperature and the heat of combustion of the burner 11 in which combustion is being performed, the heat exchanger 31 for supplying hot water and hot water is used.
The hot water temperature in the inside is estimated and detected (step S14). Then, the obtained estimated detected temperature T is set to a predetermined reference temperature T _S.
It is monitored whether or not it has become the above (step S15). When it becomes the above (yes in step S15), the hot water filling valve 71
Is started (step S16). When the temperature is lower than the reference temperature T _S (No in step S15), the control of the filling valve 71 is terminated (step S17).

Next, another method for estimating and detecting the temperature of the hot water in the hot water / hot water supply heat exchanger 31 with or without the heat exchange internal hot water temperature sensor 63 will be described with reference to FIG. . In the method shown in FIG. 3, the hot water temperature in the hot water / hot water supply heat exchanger 31 is estimated on the assumption that the circulation flow rate in the bath reheating operation is constant. The hot water temperature in the hot water / hot water supply heat exchanger 31 is estimated in consideration of the circulation flow rate flowing through the heat exchanger. Since the degree of increase in the temperature of the hot water in the heat exchanger 31 for hot water supply depends on the circulation flow rate flowing through the bath reheating circuit 20, the method uses the circulation flow rate of the bath reheating circuit 20 as a bath pot device. This is effective for those in which the flow rate can be switched, or for those in which the pipe length of the bath reheating circuit 20 changes and the circulation flow rate is not known.
Now, for each different circulation flow rate, for example, in each of the circulation flow rates A and B, the temperature of the circulation return path 23 and the temperature of the hot water The relationship with the temperature is as shown in FIG. That is, the circulation flow rate to show the different temperature rise curve for each, the temperature of each constant temperature T _A, becomes a T _B, the hot water temperature is the reference temperature T in the heat for hot water heating exchanger 31
It becomes _S. Therefore, the relationship between the temperature of the circulation return path 23 (the temperature detected by the bath temperature sensor 52) and the temperature of the hot water in the hot-water / hot-water supply heat exchanger 31 is obtained in advance by experiments for various circulation flow rates, By storing this in the controller 80 as a relational expression or a table, it is possible to estimate and detect the hot water temperature in the hot water / hot water supply heat exchanger 31. In the actual operation, the circulation flow rate of the bath additional heating circulation path 20 can be calculated from the combustion heat quantity at that time by measuring the temperature of the circulation return path 23 and the temperature of the circulation outward path 22. For this reason, the circulation forward path temperature sensor 58 is also provided on the circulation forward path 22. The calculation of the circulation flow rate can be calculated by the following formula: circulation flow rate = combustion heat quantity × thermal efficiency / (temperature of circulation forward path 22−temperature of circulation return path 23). The thermal efficiency may be obtained in advance by experiment under each condition, or may be a representative value (for example, 80% =
0.8) may be used simply.

Referring to FIG. 6, the hot water temperature in the hot water / hot water supply heat exchanger 31 is estimated and detected from the temperature detected by the bath temperature sensor 52, the temperature detected by the circulation outward temperature sensor 58, and the amount of combustion heat. An example will be described in which the controller 71 is controlled.
Now, when the bath reheating switch is turned on by the remote controller 81 (Yes in step S21), the controller 80 drives the circulation pump 54, and when the water flow switch 51 is turned on, the combustion of the gas burner 11 is started. The reheating cycle of the bath is started (step S
22). The controller 80 detects the hot water temperature of the circulation return path 23 with the bath temperature sensor 52, and detects the hot water temperature of the circulation forward path 22 with the circulation forward path temperature sensor 58 (Step S23). Then, the circulation flow rate of the hot water circulating through the bath additional heating circulation path 20 is calculated from the obtained detected temperature of the circulation forward path 22, the detected temperature of the circulation return path 23, and the amount of combustion heat (step S24). Further, the hot water temperature in the hot water / hot water supply heat exchanger 31 is estimated and detected from the detected temperature of the circulation return path 23, the calculated circulation flow rate, and the combustion heat amount of the burner 11 (step S25). Then, it is monitored whether or not the obtained estimated detected temperature T is higher than or equal to a predetermined reference temperature T _S (step S26).
Then, control of the filling valve 71 is started (step S27). When the temperature is lower than the reference temperature T _S (No in Step S26), the control of the filling valve 71 ends (Step S28).

The hot water temperature T in the hot water / hot water supply heat exchanger 31 is
Reference temperature T_SIn the case of the above, control of the hot water filling valve 71
I will talk about it. The reference temperature T_SHot water when it becomes more than
Control of the tension valve 71 is such that the discharge flow rate is as small as possible.
And the hot water temperature T in the hot water supply heat exchanger 31 is the reference temperature.
Degree T_SBasically control so that it does not become higher than
And One of the specific methods is the heat exchanger 3 for hot water supply.
1 is the reference temperature T_SWhen it comes to control
The la 80 is flushed with a predetermined minimum amount of water.
Hot water temperature is the reference temperature T _SIf the flow rate falls below
The reference temperature T in consideration of the steresis_S1 to several degrees lower than
Temperature may be used as the flow stop temperature).
If the hot water temperature rises even after a low flow rate,
The discharge flow rate is increased in accordance with the temperature rise.
In this case, the degree of increase in the discharge flow rate is, for example,
Reference temperature T _SDouble the flow rate every 1 ° C rise above
The relationship between the temperature rise and the flow rate rise is determined by the reference temperature T
_SSet the minimum amount of water and how much
Can be determined in advance by experimentation
You. As another method, the hot water temperature is set to the reference temperature T._SUntil
When the temperature rises, it reliably stops any further temperature rise
First, a certain amount of discharge flow that can be
If this reduces the temperature, depending on the reduced temperature
Decrease the amount of released water, the reference temperature T_SMore constant temperature than
Release will stop when the temperature reaches a lower, predetermined temperature.
You may do it. In this case, too,
Flow rate when the temperature reaches the reference temperature and subsequent temperature changes
Experiment on the degree of flow reduction and release stop temperature
Value depending on the model and other conditions.
Will be determined.

In the above description, the embodiment using the filling valve 71 capable of adjusting the flow rate as the control valve has been described. However, the present invention is not limited to this embodiment. A similar effect can be obtained by controlling the overflow prevention adjusting valve 66 by setting the valve 71 as an on-off valve, setting the hot water filling valve 71 in an open state, and controlling the overflow prevention adjusting valve 66. In this case, although the tapping temperature characteristic at the time of tapping hot water is slightly deteriorated, the filling valve can be configured at a low cost.

[0027]

The present invention has the above-described structure and operation. According to the bath kettle apparatus having the hot water supply function according to the first aspect, the heat exchanger for hot-water supply of the bath and the heat exchanger for hot water supply are one. A 1-can 2-circuit type bath water heater with a hot water supply function, which is heated by a burner, wherein hot water heat-exchanged by the hot water / hot water supply heat exchanger is passed through a bath automatic hot water supply path of a hot water hot water supply circuit. In a system in which hot water is supplied to a bathtub by dropping it into a reheating circuit, a control valve capable of adjusting a flow rate is provided in the bath automatic hot water supply path, while hot water in the heat exchanger for hot water supply is provided. A means for directly or indirectly detecting the temperature is provided, and when the temperature of the hot water in the hot water / hot water supply heat exchanger becomes higher than a certain reference temperature, the control valve is opened so that the flow rate can be adjusted and the hot water in the hot water / hot water supply circuit is opened. Was designed to discharge to the bathtub side Without temporarily stopping the bath reheating operation or reducing the combustion input of the burner, the temperature of the hot water in the heat exchanger for hot water supply becomes higher than the reference temperature and becomes overheated. This makes it possible to prevent or reduce the generation of boiling noise and the generation of thermal stress. Moreover, by using a control valve capable of adjusting the flow rate, it is possible to prevent the amount of drainage discharged into the bathtub from the bath reheating circuit from becoming unnecessarily large. In addition, since it is possible to adjust so that wastewater is not drained more than necessary, it is possible to prevent the heat exchanger for hot water and hot water from being taken away more than necessary, and more combustion heat is used for reheating the bath. It becomes possible to participate in the heat exchanger. According to the bath heater device with the hot water supply function of the second aspect, in addition to the effect of the configuration of the first aspect, the discharge flow rate of the control valve is changed according to the degree of the temperature exceeding the reference temperature. As a result, the necessary and sufficient drainage according to the hot water temperature in the hot water supply heat exchanger that exceeds the reference temperature can be performed more reliably, and the inconvenience due to overheating of the hot water in the hot water supply heat exchanger is sufficiently eliminated. In addition, it is possible to further minimize the amount of water discharged into the bathtub, and more preferably to suppress a decrease in the amount of heat applied to the heat exchanger for bath reheating. According to the third aspect of the present invention, in addition to the effect of the first or second aspect, the temperature sensor for directly detecting the temperature of the hot water in the hot water / hot water supply heat exchanger is provided. Since it is provided, the temperature sensor can directly detect the temperature of the hot water in the heat exchanger for hot water supply, and the temperature of the hot water in the heat exchanger for hot water supply can be accurately detected to drive the filling valve. It becomes possible. According to the bath kettle device with a hot water supply function of the fourth aspect, in addition to the effect of the configuration of the first or second aspect, the temperature of the hot water in the heat exchanger for hot water supply is controlled by a bath reheating circuit. It is configured to estimate from the temperature detected by the bath temperature sensor provided in the circulation return path and the amount of heat of combustion in the burner, so a temperature sensor for detecting the temperature of the hot water in the heat exchanger for hot water supply is required. Without using the temperature detected by the bath temperature sensor and the amount of combustion heat in the burner, the temperature of the hot water in the hot water / hot water supply heat exchanger can be estimated and detected. According to the bath kettle device with a hot water supply function of the fifth aspect, in addition to the effect of the configuration of the first or second aspect, the temperature of the hot water in the heat exchanger for hot water / hot water supply is adjusted by a bath reheating circuit. The temperature detected by the bath temperature sensor provided in the circulation return path of the bath, the temperature detected by the circulation forward path temperature sensor provided in the circulation forward path of the bath follow-up heating circuit, and the amount of combustion heat in the burner. From the detected temperature of the return path and the detected temperature of the circulation forward path, it is possible to obtain the circulation flow rate of the bath follow-up heating circulation path. Thus, the temperature of the hot water in the heat exchanger for hot water supply can be estimated and detected. Therefore, it is possible to estimate the temperature of the hot water in the heat exchanger for hot water supply without requiring a temperature sensor for detecting the temperature of the hot water in the heat exchanger for hot water supply, and for each circulation flow rate. Temperature estimation and drainage control become possible.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a bath kettle device with a hot water supply function according to an embodiment of the present invention.

FIG. 2 is a flow chart for controlling drainage by a hot water filling valve according to an embodiment of the present invention.

FIG. 3 is a diagram for explaining a method of estimating a hot water temperature in a hot water / hot water supply heat exchanger without using a temperature sensor.

FIG. 4 is a flow chart for controlling drainage by a hot water valve according to another example of the embodiment of the present invention.

FIG. 5 is a diagram illustrating another method for estimating the temperature of hot water in the heat exchanger for supplying hot water without using a temperature sensor.

FIG. 6 is a control flowchart of drainage by a hot water valve, showing still another example of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Can body 11 Gas burner 20 Bath reheating circuit 21 Bath reheating heat exchanger 22 Circulation forward path 23 Recirculation return path 30 Hot water supply circuit 31 Hot water supply heat exchanger 32 Water supply path 33 Hot water supply path 34 General hot water supply path 35 Automatic bath water supply Road 40 Bathtub 51 Water flow switch 52 Bath temperature sensor 53 Bath water level sensor 54 Circulating pump 58 Circulating forward path temperature sensor 61 Incoming water flow sensor 62 Incoming water temperature sensor 63 Hot water temperature sensor in heat exchanger 65 Outgoing water temperature sensor 69 Hot water supply temperature sensor 71 Hot water filling valve 80 Controller 81 Remote control

Claims (5)

[Claims] 1. A one-tank, two-circuit type bath kettle having a hot water supply function, wherein a heat exchanger for hot water for bath heating and a heat exchanger for hot water supply are heated by one burner. In the one in which the hot water heated and exchanged by the heat exchanger is dropped into the bath reheating circuit through the bath automatic hot water supply path of the hot water supply circuit, so that the bath can be filled with water.
A control valve capable of adjusting the flow rate to the bath automatic hot water supply path is provided, and a means for directly or indirectly detecting hot water temperature in the hot water hot water supply heat exchanger is provided. The hot water temperature in the hot water supply circuit is discharged to the bathtub side when the hot water temperature becomes higher than a certain reference temperature. apparatus. 2. The bath kettle device with a hot water supply function according to claim 1, wherein the discharge flow rate of the control valve is changed according to the degree of the temperature exceeding the reference temperature. 3. The bath kettle device with a hot water supply function according to claim 1, further comprising a temperature sensor for directly detecting the temperature of the hot water in the heat exchanger for supplying hot water. 4. The method according to claim 1, wherein the temperature of the hot water in the heat exchanger for supplying hot water and hot water is estimated from a temperature detected by a bath temperature sensor provided in a circulation return path of the hot water recirculation path and a combustion heat amount in a burner. Item 3. The bath kettle device with hot water supply function according to item 1 or 2. 5. The temperature of the hot water in the heat exchanger for supplying hot water and the temperature detected by a bath temperature sensor provided in a circulation return path of a bath follow-up heating circuit and a circulation outward path provided in a circulation return path of the bath follow-up circulation circuit. 3. The bath kettle device with a hot water supply function according to claim 1, wherein the configuration is such that the temperature is estimated from a temperature detected by the temperature sensor and a calorific value of combustion in the burner. 4.