JP2000314554A - Method of controlling automatic filling of bathtub with water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To calculate remaining water inside a bathtub precisely for accurately filling a prescribed amount of hot water in the bathtub by the automatic filling of hot water. SOLUTION: Remaining water data Lr corresponding to the amount of remaining data is calculated with Lr=Qa.Tr/(d1-d0), where d0 is the temperature of water before the heating, and d1 is the prescribed temperature when the remaining water flowing through a circulation flow path 23 is heated by a heat exchanger 21 to a prescribed temperature d1, and Qa is correction heat quantity that is corrected with the design value of heat quantity Q0 per unit time transferred to the water passing through the heat exchanger 21. The correction heat quantity Qa is calculated from Qa=Q0(Ta/Ts), where ds0 is the temperature of water prior to heating and ds is the prescribed temperature of the water, when the prescribed amount of water is filled in the bath tub and heated to the prescribed temperature ds, Ts is the heating time of the prescribed amount of the water by the designed heat quantity Q0 which is transferred to the water passing through the heat exchanger 21 per unit time and Ta is the actual heating time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic hot water filling control method for filling hot water at a set water level (set water amount) set by a user in a bathtub, and more particularly, to a method for accurately detecting the amount of residual water in the bathtub. The present invention relates to a control method for correctly supplying a shortage of water required up to a set amount of water.

[0002]

2. Description of the Related Art In a recent automatic hot water system, it is common sense to use a microcomputer (hereinafter abbreviated as "microcomputer") for various controls. This is because the microcomputer has many advantages such as flexibility of programming, high-speed operation, and large capacity of the attached storage device, and can be realized at a low cost while being able to realize multiple functions. In fact, in an automatic hot water filling system using such a microcomputer, various devices have been devised to provide various added values from various viewpoints.
Every day, progress is made to give users more comfort and satisfaction. However, one of the most basic functions in an automatic hot water system using such a microcomputer is:
There is a function to automatically fill hot water up to the set water level in the bathtub set by the user.

In this case, in a device having a water level sensor capable of detecting a water level at each time by detecting a water pressure in a bathtub, etc., it is not so difficult to fill hot water to a set water level.
The microcomputer compares and monitors the set water level preset by the user's setting operation with the actual water level detected by the water level sensor at each time, and pours water when the actual water level reaches the set water level. You just need to stop it.

However, some models do not have a water level sensor. In such a system, the amount of water supplied to the bathtub is integrated and calculated in real time, and the integrated water amount is controlled so as to be a predetermined shortage amount so that the water level is maintained at the set water level. The problem is to know exactly whether or not there is residual water in the bathtub when entering the hot water filling operation, and in particular, if there is residual water, how much it is. This is because the amount of hot water added changes.

Conventionally, detection of the remaining water amount for this purpose has been performed as follows. First, regarding the detection of the presence or absence of residual water, usually in an automatic hot water system, the residual water in the bathtub is once introduced into a circulation flow path by a circulation pump for additional cooking, etc. Heat is given by a heat exchanger in the middle of the road and returned to the bathtub again. Therefore, utilizing this function, the circulation pump is operated for a certain period of time, and it is determined whether or not the bath water flow switch provided in the middle of the circulation flow path is turned on. Of course, when the water flow switch is turned on by flowing water (hot water) in the circulation flow path, it is determined that there is residual water, and when it is off, it is determined that there is no residual water.

[0006] When it is determined that there is no remaining water, with a simple system configuration, the amount of water required to fill the empty bathtub to the set water level set by the user is set as it is as a shortage of water, and The pouring is stopped at a point where the detected integrated water amount becomes the set insufficient water amount. However, this alone may not provide an accurate set water level. Usually, the inlet of the circulation channel is provided at a position slightly higher than the bottom of the bathtub, in contact with the bottom of the bathtub. For example, as described later with reference to FIG. 1, a height hr is expected from the bottom of the bathtub 11 to the circulation channel inlet 31a. Therefore, the bottom of the bathtub 11 and the entrance 31
Even if there is residual water within the range of height hr between a and the water flow switch remains off, it is determined that there is no residual water, and if the set water amount is added as it is as a shortage water amount, It will exceed the set water volume (set water level).

Therefore, even in the conventional model, after the system is installed, the amount of water from the bottom of the bathtub to immediately below the inlet of the circulation channel (water does not enter the inlet) is detected before being used for the user. Pour the detected amount of water before detecting residual water, turn the circulation pump in this state, and if the water flow switch does not turn on, judge that the bath tub was actually `` empty '', so Otherwise, some may judge that at least some residual water remained. For this purpose, there are several methods for detecting the amount of water just below the inlet of the circulation channel, but as a pretreatment after installation, for example, a stepwise supply of a fixed amount of water from a completely empty bathtub is performed. There is a method in which the circulation pump is turned each time, and the amount of water injected up to the previous stage when the water flow switch is turned on is detected as the amount of water from the bottom of the bathtub to just below the inlet of the circulation channel. Therefore, after injecting this amount of water, turn the circulation pump, and if the water flow switch does not turn on, it can be determined that there is no residual water, and if there is residual water, the water injection switch is added to the residual water and the water flow switch is turned on. It can be determined that there was residual water.

If it is determined that there is residual water, it is then detected how much the amount is. A general method performed for this purpose is a method in which the temperature of residual water is detected by a bath temperature sensor and the residual water is heated to a set temperature. In other words, from the total amount of heat given at that time (= the amount of heat Q0 that is expected to be given per unit time x required time) and the temperature before boiling and the temperature after boiling, it is equivalent to the residual water amount in the following equation (1). Ask for data to do. Residual water amount data = Total heat given / (Temperature after boiling-Temperature before boiling) = (Heat quantity Q0 expected to be given per unit time x Required time) / (Temperature after boiling-Temperature before boiling)・ (1) If the remaining water volume is obtained, the amount of water shortage to be added can be determined from the difference from the set water volume.

[0009]

The problem with the conventional method is that the heat quantity Q0 expected to be given per unit time is transmitted to the water as it is, and is fixed. Rather, the amount of heat Q0 that can be given per unit time can naturally be known in design for each device specification, but since it is calculated using the value as it is, it is detected. An error may occur in the residual water volume. As is clear, even if the amount of heat given to the water stream via the heat exchanger is constant at a value very close to the design specification value Q0, due to the difference in the environment at the installation site of the equipment, it is difficult The amount of heat radiation is quite different. Actually, the heat efficiency of the heat exchangers often differs from one another, and the amount of heat per unit time Q0, which is considered to be given by the body temperature of the heat exchanger immediately before use or the temperature change of the four seasons, It is often different from the heat quantity Qa actually applied. Therefore, naturally, an error also occurs in the detected residual water amount, and the error is not uniform.

The present invention has been basically made in view of this point, and provides a method for more accurately detecting the amount of residual water. More preferably, the present invention provides a method for detecting temperature changes in the surrounding environment, such as changes in four seasons, and aging of equipment. It is an object of the present invention to provide an automatic hot water filling control method having a residual water amount detection function capable of coping with a change in heat exchange efficiency due to a change.

[0011]

According to the present invention, in order to attain the above object, the remaining water in the bathtub is added to the amount of insufficient water to fill a predetermined amount of hot water, and the remaining water is circulated in a circulation channel. Boil up to a predetermined temperature d1 through a heat exchanger while passing through, a unit d0 and a predetermined temperature d1 before boiling, a unit that may be known in design and given to water passing through the heat exchanger From the corrected heat quantity Qa which corrected the heat quantity Q0 per time and the time Tr actually started to boil, the residual water amount data Lr corresponding to the residual water amount is represented by Lr = Qa · Tr / (d1−d0) ··・ Calculate in (a), subtract the remaining water amount calculated based on the remaining water amount data obtained by the above equation (a) from the set water amount, obtain the insufficient water amount, and supply this insufficient water amount to the bathtub. Then, the above-mentioned corrected heat quantity Qa is obtained by supplying water having a predetermined water amount Ls into the bathtub, boiling the water having the predetermined water amount Ls to a predetermined temperature ds, a temperature ds0 before heating at that time and the predetermined temperature ds. From the above, it is necessary when the water having the predetermined water amount Ls is boiled to the predetermined temperature ds with the heat amount per unit time Q0 which can be given to the water passing through the heat exchanger, which can be known in the design and is considered to be given to the water. Qa = Q0 (Ta / Ts) (b) is calculated from the boil-up time Ts calculated as expected and the bake-up time Ta actually taken.

After satisfying this basic configuration, it is desirable that the calculation of the above equation (b) be performed after the bathtub is installed and before the bathtub is used for the user, and the predetermined water amount Ls is determined by the user. It is good to set the amount of water to set.

Further, according to the present invention, in order to cope with aging and aging of the equipment, changes in the surrounding environment, changes in the four seasons, and the like,
After installing the bathtub, before using it for the user,
After obtaining the set water amount, the set water amount is changed to the predetermined water amount L each time the set water amount is boiled to the set hot water temperature or every several times.
s, the set hot water temperature is set to the predetermined temperature ds, and the calculation of the above equation (b) is performed.In consideration of the correction heat amount newly obtained, the correction heat amount Qa obtained up to the previous time is corrected and updated. suggest.

In addition, as a more practical consideration, as described above, when correcting the corrected calorific value Qa obtained up to the previous time in view of the newly obtained corrected calorific value, the average of these two values is calculated as a new value. It is also proposed to follow the method of setting the corrected calorific value Qa.

Further, as a convenient method for use by the user, the above-mentioned predetermined temperature d1 at the time of obtaining the remaining water amount Lr based on the above-mentioned equation (a) is determined by the user when the set water amount is finally determined. There is also proposed a method of setting a set hot water temperature when it is desired to boil water to a set hot water temperature, and notifying a user when the remaining water is heated up to the set hot water temperature. In this way, even if the hot water has not reached the set water level, the user can be notified that the temperature has reached the temperature at which the hot water can be poured, so that the user can wait for the water level to rise while taking a bath. .

[0016]

FIG. 1 shows an automatic hot water filling system to which the method of the present invention can be applied.
You can pour hot water into the tub and re-cook the hot water remaining in the bathtub. The illustrated device configuration itself does not need to be changed in the present invention from the known configuration in particular, but it will be described step by step as if there is a heat exchanger 21 first and it is wrapped around it. Or two pipes 22 and 23 pass through it, one pipe 22 is connected to a water tap 12 such as a faucet or a shower, and the other pipe 23 is used for reheating when the temperature of hot water in the bathtub 11 is low. In order to do so, it is connected to a bathtub 11. A pipe 24 used for filling hot water as described later is also connected to a pipe 23 that forms a circulation flow path of hot water or residual water in the bathtub.

In the heat exchanger 21, tap water passing through a pipe 22 is heated and heated by a burner 14, and a bathtub circulating in a pipe 23 is provided.
The hot water in 11 is also heated and heated by burner 14. Gas is supplied to the burner 14 via a pipe 16 as fuel for combustion. However, even when kerosene or other fuel is used, the system configuration is almost the same, so if gas is read as such other fuel, the following description in this document can be generally used as it is, and the present invention is applied. There is no essential difference above.

The fuel gas through the fuel pipe 16 is supplied to the solenoid valve 17.
After that, it is sent to the burner 14 via the proportional valve 15. Burner
14 also receives an appropriate amount of air from the blower 18 from time to time. Depending on the system, different heat exchangers may be used for hot water supply to the bathtub 11 via the pipe 22 and for additional heating of hot water in the bathtub via the pipe 23 which is a circulation flow path. At this time, the burners 14 may be provided exclusively for the respective burners.

The flow rate of water in the pipe 22 passing through the heat exchanger 21 is detected by a flow rate sensor 25, and the temperature of the water before entering the heat exchanger 21 is detected by a feed water temperature sensor 26 from the heat exchanger 21. Hot water temperature is detected by hot water temperature sensor 27, respectively.

The bathtub 11 is provided with a circulation port 31 comprising an inlet (suction port) 31a and an outlet (discharge port) 31b. Hot water in the bathtub 11 is supplied to a pipe (circulation flow path) 23 by a circulation pump 32. It is sucked from the inlet 31a provided on the way, guided into the circulation channel 23, discharged through the outlet 31b after passing through the heat exchanger 21, and returned to the bathtub 11 again. Bath water is circulated
When flowing through 23, the water flow is detected by a bath water flow switch 33, and its temperature is detected by a bath temperature sensor. In addition, the arrangement of the inlet 31a and the outlet 31b of the circulation flow path is arranged in a vertical relationship in which the inlet 31a is downward in the illustrated case, but there are cases where the arrangement is reversed, and there are cases where they are arranged side by side, , May be concentric. However, the circulation flow path inlet 31a is hardly open at the bottom of the bathtub 11, and almost from the bottom of the bathtub 11 to immediately below the inlet 31a.
Usually there is a certain height hr, which is why
Even if there is no water flowing in the circulation flow path as in the present invention, there is a possibility that there is residual water whose quantity is unknown at each time, and it is necessary to accurately detect this. come.

The pipe 22 is branched after the heat exchanger 21, before the hot water tap 12, and after passing through a hot water filling solenoid valve 35,
24 is connected to the circulation channel 23. Therefore hot water solenoid valve
When 35 is opened, hot water heated from tap water is supplied to the bathtub 11 through the pipe 22,
It is supplied via 24 and 23 and is filled with hot water.

The filling controller 1 is mainly composed of a microcomputer and controls the entire automatic filling system. The flow sensor 25, the feed water temperature sensor 26, and the water flow switch disposed in the circulation passage are described above. 33, the detection signals of the bath temperature sensor 34 and the hot water temperature sensor 27 are inputted, and the solenoid valve 17 for opening and closing the fuel, the proportional valve 15 for adjusting the fuel flow rate, the hot water filling solenoid valve 11, the circulation pump 32, and the blower Outputs a control signal to 18.

A remote controller (hereinafter referred to as "remote controller") 3 is connected to the filling controller 1, and the filling controller 1 is based on the operation of various operation switches (not shown) attached to the remote controller 3. Signals and the above various sensors 2
Automatic filling control is performed in response to detection signals from 5, 26, 27, 33 and 34. Although only one remote controller 3 is shown in the figure, it can be installed at a plurality of locations such as a bathroom and a kitchen. In the automatic hot water filling system having such a configuration, the hot water control device 1 performs the following control.

When the user turns on the hot water tap 12 such as a faucet or a shower when the power is turned on and the hot water filling control device 1 is in an operable state, a water flow passing through the heat exchanger 21 is generated. Then, the flow sensor 25, which has been issuing the water flow stop signal (the zero flow signal), firstly shows a signal indicating that the water has started to flow (therefore, the flow signal can also serve as an on / off detection signal of the water flow). ) The hot water filling control device 1
Send to Receiving this, the filling system 1 sends a signal for giving a predetermined amount of valve opening to the proportional valve 15 (the electromagnetic valve 17 is of course opened before that), and the amount corresponding to the valve opening is Is supplied to the burner 14, and an air amount adjustment signal (rotation speed control signal) is sent to the blower 18 to supply an appropriate amount of air to the burner 14 for combustion, and also activate an ignition mechanism (not shown). .

When the combustion in the burner 14 starts in this way, the heat exchanger 21 is heated, and the water passing through the pipe 22 is warmed and supplied as hot water from the hot water tap 12 such as a faucet. Is also detected by the tapping temperature sensor 27, and if there is an error between the tapping temperature and the set temperature set by the user, the filling control device 1 moves in a direction to eliminate such an error. The degree of opening and closing of the proportional valve 15 and the number of revolutions of the blower 18 are adjusted, so that the combustion energy in the burner 14 is adjusted.

The user closes the faucet or the like from which the hot water is being discharged,
When the hot water is stopped, the flow sensor 25 sends a water flow stop signal (zero flow signal) to the filling controller 1, and upon receiving the signal, the filling controller 1 sends a fully closed signal to the proportional valve 15 and the solenoid valve 17. The burner 14 is sent out to function to extinguish the fire immediately.

When the user operates a filling command switch (not shown) provided on the remote controller 3 and selects automatic filling in the bathtub 11, the filling control is performed on the filling control device 1. In response to the request signal, the filling controller 1 opens the filling electromagnetic valve 35 and transfers the hot water of the pipe 22 heated by the heat exchanger 21 from the branch pipe 24 to the bathtub 11 via the circulation flow path 23. Pour water.

Set water level data is given to the water filling control device 1 in advance as one of the data groups necessary for automatic hot water filling. However, as described above, in a system without a water level sensor, the water level data is the water amount relative to the water level. It is represented by In addition, as described above, when entering the bathing operation, the bathtub
Since the amount of hot water to be added changes depending on whether or not there is residual water in 11, the presence or absence of residual water is detected before the filling operation, and if there is residual water, the residual water amount is calculated.

The detection of residual water may be in accordance with a known technique. In this embodiment, as one of such known techniques, a bath water flow switch provided in a circulation path for additional cooking is provided.
It depends on whether 33 is turned on. That is, the circulation pump 32 is operated for a certain period of time, and when the bath water flow switch 33 is turned on, the hot water control device 1 determines that there is residual water, and when it is off, there is no residual water.

However, as described above, if it is determined that there is no residual water by simply turning on / off the water flow switch as described above without taking any countermeasures, the circulation from the bottom of the bathtub 11 is performed. Even when residual water remains in the range of the height hr up to the inlet 31a of the flow channel 31, it is determined that there is no residual water.
Therefore, after installing the system, in the bathtub 11 used there, water does not enter the circulation flow path inlet 31a, but if water is filled up to the height hr immediately below, the amount of water is It is desirable to know what will happen. The technique,
This may also be in accordance with known techniques and is not directly specified in the present invention, but may be, for example,
11 is to supply water in a constant amount step by step from a completely empty state, turning the circulation pump 32 slightly each time, and when the water flow switch 33 is turned on, the water injection amount up to the previous stage. Is detected as the amount of water from the bottom of the bathtub 11 to immediately below the circulation channel inlet 31a.

Therefore, after injecting the water amount obtained in this way, the circulation pump 32 is turned as described above, and if the water flow switch 33 is not turned on, it can be determined that there is no residual water, and there is residual water. For example, since the water injection amount is added to the residual water, the water flow switch 33 is turned on, and it can be determined that there is residual water.

However, even if it can be determined that there is residual water, the amount is not known, so the operation for detecting the amount of residual water is started next. The present invention makes an improvement here, and in this embodiment, the remaining water is accurately obtained by the following method.

That is, the filling controller 1 instructs the operation of heating the remaining water to the predetermined temperature d1 through the heat exchanger 21 while passing the remaining water through the circulation channel 23. And the bath temperature sensor 34
After the completion of heating is detected by detecting the temperature via the heater, the hot water control device 1 determines the temperature d0 of the water (hot water) in the bathtub 11 and the temperature after heating (the temperature (d0)) before the heating. The above-mentioned predetermined temperature) d1, a corrected calorific value Qa obtained by correcting the calorific value Q0 per unit time which can be known in the design of the system and considered to be given to the water passing through the heat exchanger 21, and the actual heating From the time Tr, the residual water amount data Lr corresponding to the residual water amount is calculated by Lr = Qa · Tr / (d1−d0) (a).

In this way, when the actual remaining water amount is obtained from the data, the filling controller 1 subtracts the obtained remaining water amount from the set water amount to obtain the insufficient water amount, and in accordance with the already described pouring mechanism, The water (hot water) heated to the set hot water temperature via the heat exchanger 21 is supplied to the bathtub 11 while the accumulated water amount up to that time is grasped via the flow rate sensor 25 until the amount reaches the calculated insufficient water amount. .

However, in the present invention, in order to detect an accurate residual water amount, in the calculation of the above equation (a), a unit which may be known in the design of the system and is considered to be given to the water passing through the heat exchanger 21 It is characterized in that the calorific value Q0 per time is not used as it is, but the corrected calorific value Qa is used to correct this. Conventionally, the known amount of heat Q0 was used as it was, so that the above-mentioned problem which was a problem to be solved by the present invention occurred, and it was not possible to accurately detect the amount of residual water.

The corrected heat quantity Qa in the present invention is desirably obtained immediately after the system is installed and before it is used for the user. In the method, an appropriate predetermined amount of water Ls is set in advance, and water of the amount Ls is supplied into the bathtub 11, and the predetermined amount of water Ls
Is boiled to a predetermined temperature ds. From the temperature ds0 before boiling at this time and the predetermined temperature ds, a predetermined amount of water Ls is supplied at a predetermined amount of heat Q0 per unit time which can be known by design and given to water passing through the heat exchanger. Boil-up time Ts estimated to be required when boiling to temperature ds
Qa = Q0 (Ta / Ts) (b) from the actual heating time Ta that was applied.

Since the residual water amount detection is performed using the corrected heat amount Qa obtained in this manner, even if the heat radiation amount in the pipes and bathtubs is considerably different due to the difference in the environment at the site where the equipment is installed, the heat amount is not changed. This can be compensated for even if the heat efficiencies of the exchangers are different. As in the related art, the possibility that the residual water amount is erroneously calculated due to such a fluctuation factor is greatly reduced.

It should be noted that the accuracy increases as the predetermined amount of water Ls for obtaining the corrected heat quantity increases to some extent. Time error ratio (Ta / Ts)
Is also easy to come out clearly. Therefore, for example, during the installation work, ask the user, ask how much hot water is actually used to take a bath, etc. If there is, the set water amount is preferably set as the predetermined water amount Ls at the time of calculating the corrected heat amount. If so, the amount is sufficient, and the boil-up time becomes longer, so that the above requirement can be satisfied. However, this predetermined water volume Ls
May be initialized by the manufacturer in advance.

Further, in accordance with a specific embodiment of the present invention, even after the corrected heat quantity Qa is first determined, the set value is set every time the user boiles the set amount of water to the set hot water temperature, or every several times. Assuming that the water amount is the predetermined water amount Ls and the set hot water temperature is the predetermined temperature ds, the filling controller 1 performs the calculation of the equation (b) described above, and in view of the correction heat amount newly obtained by this, It is preferable to correct and update the corrected calorific value Qa obtained up to the previous time. It is clear that this is an advantage,
It is possible to cope with a change over time, a surrounding environment, a change in temperature in the four seasons, and the like, so that an error hardly occurs in the detection of the amount of residual water even after time. When updating the corrected calorific value, in order to avoid a sudden change, for example, the corrected calorific value obtained up to the previous time
The average of Qa and the newly obtained corrected calorific value is calculated as the new corrected calorific value Qa.
It is desirable that The averaging includes, of course, a simple arithmetic mean and a geometric mean, as well as an empirically determined weighted averaging process. What is necessary is just to adopt an appropriate thing.

The correction heat quantity that can be updated in this manner is stored in, for example, the auxiliary storage device 2 connected to the hot water filling device 1.
If the information is stored in an electrically rewritable nonvolatile memory such as an EEPROM, the information does not volatilize even in the event of a power failure, so that the corrected calorific value can be stably used for a long time.

Further, before the automatic hot water filling, (a)
Predetermined temperature d1 set when detecting residual water amount according to the formula
Is asked to the user at the time of installation of the equipment, and given to the filling controller 1 as the set hot water temperature desired by the user, when the calculation of the remaining water amount is completed, the remaining water has already reached the set hot water temperature. Since the notification means is not shown in the figure, using an appropriate notification sound generation means or lighting or blinking means, etc.
Alternatively, a display such as a liquid crystal display means
It is convenient to notify the user when the residual water has been fired. The amount of hot water has not reached the set hot water amount, but at least the hot water temperature has reached the set hot water temperature, so that the user can start bathing early.

[0042]

As described above, according to the hot water filling method of the present invention, even if the heat radiation amount in the entire system is different or the heat efficiency is different due to the heat exchanger, the bath tub is not affected. Can be accurately obtained, and the accuracy can be improved when the set amount of hot water is filled with automatic hot water filling. Further, according to the specific mode of the present invention, since the corrected heat amount used for the calculation of the residual water amount is updated in consideration of the previous data, the heat release amount differs in a season even in the same device, and furthermore, the heat exchange amount is changed. Even if the combustion efficiency varies depending on the temperature of the heat exchanger body at the start of use of the heat exchanger, the effects can be totally corrected. In any case, according to the present invention, even a system without a water level sensor can be filled with the same accuracy as a system with a water level sensor.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an automatic filling system to which the method of the present invention can be applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automatic filling controller 2 Auxiliary storage device 3 Remote controller 11 Bathtub 14 Burner 15 Proportional valve 16 Fuel piping 17 Solenoid valve 18 Blower 21 Heat exchanger 22 Hot water supply piping 23 Circulation flow path 25 Flow rate sensor 26 Water supply temperature sensor 27 Water supply temperature sensor 31 Circulating port 31a Circulating channel inlet 31b Circulating channel outlet 32 Circulating pump 33 Water flow switch 34 Bath temperature sensor

Claims (6)

[Claims] 1. To add a shortage of water to the remaining water in the bathtub to fill a predetermined set amount of hot water, boil the remaining water to a predetermined temperature d1 via a heat exchanger while passing the remaining water through a circulation flow path. Temperature, the temperature d0 before heating and the predetermined temperature d1, the corrected calorific value Qa corrected for the calorific value Q0 per unit time which can be known by design and given to the water passing through the heat exchanger, and the actual The remaining water amount data Lr corresponding to the amount of the remaining water is calculated from the time Tr required for the boil-up by Lr = Qa · Tr / (d1−d0) (a), and from the above set water amount, subtracting the determined residual water amount based on the residual water amount data determined by the equation (a) to obtain a shortage water amount, and supplying the shortage water amount into the bathtub;
The corrected calorie Qa supplies a predetermined amount of water Ls to the bathtub,
The water having the predetermined water amount Ls is boiled to a predetermined temperature ds, and from the temperature ds0 before boiling at that time and the predetermined temperature ds, given to the water passing through the heat exchanger, which can be known in design and given. The amount of heat Q0 per unit time considered to be the predetermined amount of water Ls
Qa = Q0 (Ta / Ts) (b) from the boil-up time Ts estimated to be required when boiling the water to the above-mentioned predetermined temperature ds and the boil-up time Ta actually taken. ) The method for controlling automatic filling of hot water into a bath tub. 2. The method of claim 1, wherein (b).
The method according to claim 1, wherein the calculation of the formula is performed after the bathtub is installed and before the bath is provided for the user. 3. The method according to claim 1, wherein the predetermined water amount Ls is the set water amount. 4. The method according to claim 1, wherein after setting the bath tub and before obtaining the corrected heat quantity Qa before using the bath for the user, the water of the set water amount is boiled to the set hot water temperature. In each or every several times, the set water amount is the predetermined water amount Ls, the set hot water temperature is the predetermined temperature ds, and the formula (b) is calculated. Correcting and updating the corrected calorific value Qa obtained up to the previous time;
A method characterized by the following. 5. The method according to claim 4, wherein when correcting the corrected calorific value Qa obtained up to the previous time in view of the newly calculated corrected calorific value, an average of these two values is calculated as a new corrected calorific value. Following the method of Qa; 6. The method according to claim 1, wherein the predetermined temperature d1 for obtaining the residual water amount Lr based on the equation (a) is determined by the user. The set hot water temperature when it is desired to boil the set water amount to the set hot water temperature,
Notifying the user when the residual water has been heated to the set hot water temperature.