JPH11125460A - Automatic hot-water filling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic hot-water filling device which enables accurately calculating a sectional area of a bathtub without basing the calculation on its capacity and which is free from difference in water level between the time of calculating the sectional area of the bathtub and the time of usually filling the bathtub. SOLUTION: There are provided a hot-water supplying means 1, a water level sensor 25, a flow-rate sensor 16, a hot-water supply cumulating means 31 which cumulatively calculates hot water supplied to a bathtub 9, a hot-water supply port water level detective means 32 which detects a complete rise of the water level of the bathtub 9 to the hot-water supply port 22, and a bathwater-filling controlling means 30. The bathwater-filling controlling means 30, from the point of time of the detection that the water level of the bathtub 9 has reached the hot-water supply port 22, effects an additional supply of hot water to a prescribed quantity, has a sectional area-calculating means 33 which calculates the sectional area of the bathtub on the basis of the rise of the water level of the bathtub caused by the additional supply of hot water and the prescribed quantity referred to above, and has also a hot-water supply target-calculating means 34 which calculates the hot-water supply target from the target water level of bathfilling in a setup for the sectional area-calculating means 33 to set the more for the prescribed quantity referred to above, the larger the capacity of the bathtub 9 is.

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 device for supplying hot water to a bathtub to a predetermined target water level.

[0002]

2. Description of the Related Art Conventionally, there is known an automatic hot water filling apparatus in which a hot water supply device is connected to a hot water supply port provided below a side surface of a bathtub through a hot water supply pipe, and the hot water supply device supplies hot water to the bathtub. . In such an automatic hot water filling device, in the hot water supply pipe,
A water level sensor for detecting a water level in the bathtub by water pressure and a flow rate sensor for detecting a flow rate of hot water supply to the bathtub are provided, and a cumulative hot water supply amount to the bathtub is calculated from a detection value of the flow rate sensor.

Further, in order to perform so-called reheating, a circulation circuit having a part of a hot water supply pipe as a part thereof, a circulation pump for circulating hot water in a bathtub through the circulation circuit, and Some include a heat exchanger for heating the flowing hot water.

In such an automatic hot water filling apparatus, in order to perform hot water filling to a predetermined target water level, a process of calculating a bathtub cross-sectional area is performed at the time of the first hot water filling. And 2
At the time of the next bathing, the hot water is first supplied until it exceeds the hot water supply port of the bathtub, and the product of the difference between the water level at that time and the target water level and the bathtub cross-sectional area calculated at the time of the first bathing is used. Calculate the target hot water supply required to raise the water level.

Since the water level sensor installed in the hot water supply pipe detects the water level in the bath tub based on the pressure from the water in the bath tub, when the water level in the bath tub is detected, the hot water supply to the bath tub or the circulation pump is performed. It is necessary to stop operation to eliminate these effects. On the other hand, when the flow rate sensor detects the supply flow rate to the bathtub, it is not necessary to stop the hot water supply to the bathtub.

Therefore, as described above, the target water level is replaced with the target hot water supply amount, and the hot water supply for the target hot water supply amount is performed while calculating the cumulative value of the hot water supply amount to the bathtub from the detection value of the flow rate sensor. Thus, the hot water can be quickly filled to the target water level without interrupting the hot water supply for detecting the water level in the bathtub by the water level sensor.

Here, the bathtub cross-sectional area described above is calculated by the following processing.

First, a fixed amount (for example, 10 liters) of hot water is supplied from a water heater to a bathtub, and a circulation pump is operated each time the fixed amount of hot water is completed, and a water flow switch provided in a circulation circuit is turned on. Check whether or not. When the water flow switch is turned on, it is determined that hot water has been supplied to the height of the hot water inlet of the bathtub, and the water level of the bathtub at that time is set as a reference water level (first step).

Next, a predetermined amount (for example, 40 liters) of hot water is additionally supplied to the bathtub (second step).

Then, the water level rise amount (current water level-reference water level) of the bathtub when the additional hot water supply in the second step is completed is calculated, and this water level rise amount and the constant hot water supply amount supplied in the second step are calculated. (40 liters), the bathtub cross-sectional area is calculated (third step).

As described above, in the conventional automatic hot water filling apparatus, a fixed amount of additional hot water is supplied from the reference water level (the second step), and the amount of rise in the water level of the bathtub at the end of the additional hot water supply and the additional hot water supply The bathtub cross-sectional area is calculated from the amount (the third step), but in this case, there are the following disadvantages.

That is, when the predetermined amount (the amount of additional hot water supply) in the second step is set to a relatively small amount, in a bathtub having a large volume, the rise in the water level of the bathtub due to the additional hot water supply becomes small. The water level of the bathtub detected by the water level sensor includes some detection errors. However, if the rise in the water level is so small, the influence of the detection errors on the detection value of the water level sensor at the end of the additional hot water supply. Therefore, there was a disadvantage that the bathtub cross-sectional area could not be accurately calculated.

Conversely, if the predetermined amount (additional hot water supply amount) in the second step is set to a relatively large amount, in a bathtub having a small capacity, the water level rise due to the additional hot water supply becomes large, and the additional hot water supply exceeds the target water level. May be performed. In this case, since the filling water level at the first time (when calculating the cross-sectional area) is different from the filling water level at the second and subsequent times, there is an inconvenience that the user feels strange.

[0014]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned disadvantages, and can accurately calculate the cross-sectional area of a bathtub regardless of the volume of the bathtub. It is another object of the present invention to provide an automatic hot water filling apparatus in which the hot water level during normal hot water filling does not differ.

[0015]

In order to achieve the above object, a first embodiment of the present invention is a hot water supply which is connected to a hot water supply port provided in a bathtub through a hot water supply path to supply hot water to the bathtub. Means, a water level sensor provided in the hot water supply passage for detecting a water level in the bathtub, a flow sensor for detecting a flow rate of hot water supplied from the hot water supply port to the bathtub, and a detection value of the flow sensor to the bathtub. Hot water supply amount accumulating means for calculating the accumulated hot water supply amount, and hot water supply water level detecting means for detecting that the water level in the bathtub has exceeded the hot water supply port, and supplying hot water at a predetermined target water level to the bathtub via the hot water supply means. A hot water filling control means for performing hot water filling, the hot water filling control means, after the start of hot water supply to the bathtub, the hot water supply water level detection means when the water level of the bathtub is detected to reach the hot water inlet The water level detected by the bath tub is used as the reference water level. Then, a predetermined amount of additional hot water is supplied from the reference water level, and a sectional area of the bathtub is calculated based on a difference between the detected water level of the bathtub by the water level sensor at the end of the additional hot water supply and the reference water level, and the predetermined amount. And a target hot water supply amount calculating means for calculating a target hot water supply amount according to a difference between the reference water level and the target water level based on the cross-sectional area of the bathtub calculated by the cross-sectional area calculating means. Have
After the start of hot water supply to the bathtub, the cumulative value of the hot water supply amount by the cumulative value calculation means after the water level of the bathtub reaches the reference water level,
By performing hot water supply until the target hot water supply amount is reached, in the automatic hot water filling apparatus that supplies hot water to the target water level, the cross-sectional area calculating means sets the predetermined amount to be larger as the volume of the bathtub is larger. It is characterized by.

According to the present invention, the cross-sectional area calculation means sets the predetermined amount of additional hot water supply from the reference water level to be larger as the capacity of the bathtub given in advance is larger. Therefore, when the capacity of the bathtub is large, a large amount of additional hot water is supplied from the reference water level, and the rise in the water level of the bathtub does not decrease. Thus, the influence of the detection error of the water level sensor is reduced, and the accuracy of the bathtub cross-sectional area calculated by the cross-sectional area calculating means can be improved.

On the other hand, when the volume of the bathtub is small, the cross-sectional area calculating means sets the predetermined amount to a small amount.
The rise of the water level in the bathtub due to the additional hot water supply does not become very large. Therefore, when the cross-sectional area calculating means calculates the cross-sectional area of the bathtub, it is possible to prevent a large amount of additional hot water from exceeding a predetermined target water level. As a result, the filling water level at the first time (when calculating the bathtub cross-sectional area) and 2
It is possible to prevent the user from feeling uncomfortable due to the difference of the hot water level after the first time.

Further, the automatic hot water filling apparatus of the first embodiment is provided with a bathtub volume designating means for designating a volume of the bathtub by an operation of a user or an installer, and the sectional area calculating means is provided with the bathtub volume. The volume of the bathtub is indicated by the designation means.

According to the present invention, the sectional area calculating means instructs the volume of the bathtub according to the contents specified by the bathtub volume setting means.

Further, the cross-sectional area calculating means of the first embodiment is arranged so that the water level in the bathtub is detected by the hot water level detecting means until the water level in the bathtub exceeds the hot water port. The volume of the bathtub is indicated by the accumulated hot water supply amount when hot water is supplied.

According to the present invention, since the sectional area calculating means is instructed on the volume of the bathtub from the accumulated hot water supply amount, there is no need for the user or the installer to specify the volume of the bathtub.

The cross-sectional area calculating means of the first embodiment may be arranged such that the cross-sectional area calculating means supplies a predetermined amount of hot water from the reference water level while the additional hot water is supplied from the reference water level. At that time, the water level sensor detects the water level in the bathtub, calculates the difference between the detected water level and the reference water level, and calculates the approximate cross-sectional area of the bathtub based on the fixed amount, and calculates the approximate cross-sectional area. Is characterized by recognizing the volume of the bathtub.

According to the present invention, the sectional area calculating means calculates the approximate sectional area of the bathtub during the predetermined additional hot water supply from the reference water level, and recognizes the volume of the bathtub based on the approximate sectional area. . This eliminates the need for the user or installer to specify the bathtub volume.

A second embodiment of the present invention relates to a hot water supply means connected to a hot water supply port provided in a bath tub through a hot water supply path to supply hot water to the bath tub, and a bath tub provided in the hot water supply path. A water level sensor for detecting a water level in the bath, a flow rate sensor for detecting a flow rate of hot water supplied from the hot water supply port to the bathtub, and a hot water supply amount accumulating means for calculating a cumulative hot water supply amount to the bathtub from a detection value of the flow rate sensor. A hot water supply level detecting means for detecting that the water level in the bathtub has exceeded the hot water supply port, and a hot water filling control means for supplying hot water at a predetermined target water level to the bathtub via the hot water supply means; Tension control means, after the start of hot water supply to the bathtub, the detected water level of the bathtub by the water level sensor at the time when the water level of the bathtub is detected to reach the hot water inlet by the hot water outlet water level detection means as a reference water level, Additional hot water of a predetermined amount from the reference water level A cross-sectional area calculating means for calculating a cross-sectional area of the bath tub based on a difference between a detected water level of the bath tub by the water level sensor at the end of the additional hot water supply and the reference water level, and the predetermined amount; And a target hot water supply calculating means for calculating a target hot water supply according to a difference between the reference water level and the target water level, based on the cross-sectional area of the bathtub calculated by In an automatic hot water filling apparatus for supplying hot water up to the target water level, by performing hot water supply until the cumulative value of the hot water supply amount by the cumulative value calculating means after the water level reaches the reference water level reaches the target hot water supply amount, The cross-sectional area calculating means calculates the cross-sectional area of the bathtub by two.
The first time, when the sectional area of the bathtub is calculated, the predetermined amount is set to a predetermined reference amount, and when the second area of the bathtub is calculated, the predetermined amount is calculated when the first area is calculated. The larger the cross-sectional area of the bathtub is, the more the setting is made.

In the first embodiment, when calculating the cross-sectional area, the cross-sectional area calculating means needs to indicate the volume of the bathtub in advance. In the above aspect, at the time of the first time of calculating the cross-sectional area, the cross-sectional area calculating means indicates the volume of the bathtub by the cross-sectional area of the bathtub calculated by fixing the predetermined amount to the reference amount.

For this reason, in the second embodiment, there is no need to perform a process of instructing the volume of the bathtub in advance. When calculating the cross-sectional area of the bathtub for the second time, the cross-sectional area calculating means sets the predetermined amount to be larger as the cross-sectional area of the bathtub calculated in the first cross-sectional area calculation (proportional to the volume of the bathtub) is larger. . Therefore, at the time of calculating the bathtub cross-sectional area for the second time, the rise in the water level of the bathtub due to the predetermined amount of additional hot water does not decrease even when the volume of the bathtub is large. This allows
At the time of calculating the bathtub cross-sectional area for the second time, similarly to the first embodiment, the influence of the detection error of the water level sensor is suppressed,
The accuracy of the bathtub cross-sectional area calculated by the cross-sectional area calculating means can be improved.

[0027]

FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIGS. FIG. 1 is an overall configuration diagram of the automatic hot water filling device of the present invention, FIG. 2 is an explanatory diagram of a hot water filling level of a bathtub,
FIGS. 3 and 4 are flowcharts showing processing for calculating the bathtub cross-sectional area in the automatic hot water filling apparatus shown in FIG.

Referring to FIG. 1, the automatic hot water filling apparatus of the first embodiment includes a hot water supply means 1 and a reheating means 2, and a controller 3 operates the hot water supply means 1 and the reheating means 2. Is controlled.

The hot water supply means 1 is provided with a water pipe 5 penetrating through the heat exchanger 4 for hot water supply, and heats water supplied from a water pipe (not shown) to the water pipe 5 by means of a heat exchanger 4 for hot water supply (not shown) by a gas burner. ) Is heated in the hot water. The downstream end of the water pipe 5 branches into a regular water pipe 6 connected to a hot water tap (not shown) in a kitchen or a lavatory, and a bath water pipe 8 connected to a circulation path 14 (described later). The hot water can be supplied from the water pipe 5 to the kitchen or the like via the common water pipe 6, while the hot water can be supplied from the water pipe 5 to the bathtub 9 via the bathtub water pipe 8.

An incoming water temperature thermistor 10 and an incoming water flow sensor 11 are provided in the upstream part of the water pipe 5, and a hot water quantity servo 12 for controlling the hot water supply flow rate and an outgoing water temperature thermistor 13 are provided in the downstream part. Is provided.

The bathtub water pipe 8 includes an electromagnetic valve 15, a hot water supply flow sensor 16 (corresponding to the flow sensor of the present invention), and the hopper 1
7, a check valve 18 and a three-way valve 19 are provided in this order, and are connected to a circulation path 14 for circulating hot water in the bathtub 9.
Hot water supply flow rate sensor 16 outputs a signal corresponding to the flow rate of hot water flowing through bath hot water supply passage 7.

The reheating unit 2 is constituted by a circulation path 14, a circulation pump 20, and a heat exchanger 21 for a bathtub. The circulation path 14 is supplied from a three-way valve 19 through a circulation pump 20 and a heat exchanger 21 for a bath. Outgoing route 14a to bathtub 9 and three-way valve 1
The outgoing path 14a and the return path 14b are connected to a hot water supply port 22 provided on the lower side surface of the bathtub 9.

A water flow switch 23 for detecting the presence / absence of water flow in the circulation path 14 and a bath tub temperature thermistor 24 are provided in the middle of the forward path 14a, and the water level in the bath tub 9 is supplied in the middle of the return path 14b. A water level sensor 25 that detects through the mouth 22 is provided.

The water level sensor 25 comprises a pressure sensor for detecting the water level in the bathtub 9 as a hydrostatic pressure corresponding to the water level. When the hot water in the bathtub 9 is at a water level higher than the hot water supply port 22. And outputs a signal corresponding to the water level.

In the hot water supply means 1 and the additional heating means 2 configured as described above, when filling the bathtub 9 with water, the solenoid valve 15 is opened and the water supply pipe 5 of the hot water supply means 1 is opened. Hot water is supplied to the bathtub 9 via the bathtub water pipe 8 and the circulation path 14. In this case, the hot water flowing from the bathtub drainage pipe 8 into the circulation path 14 via the three-way valve 19 reaches the bathtub 9 from the three-way valve 19 through both the outward path 14a and the return path 14b of the circulation path 14, so-called two-way transport. Hot water is supplied to the bathtub 9.

When heating the hot water in the bathtub 9, that is, when performing so-called additional heating, the circulation pump 20 is operated with the electromagnetic valve 15 closed, so that the hot water in the bathtub 9 is circulated through the circulation path. The hot water in the bathtub 9 is heated by operating the bathtub heat exchanger 21 (heated by a gas burner not shown) at this time.

The controller 3 includes a CPU, a RAM, an RO
M and the like, and includes hot water filling control means 30 and hot water supply amount accumulating means 31. The hot water filling means 30 is provided in the bathtub 9.
A water inlet water level detecting means 32 for detecting that the water level in the inside reaches the hot water inlet 22, a cross-sectional area calculating means 33 for calculating a cross-sectional area of the bathtub 9, and when filling the bathtub 9 with a predetermined target water level, There is a target hot water supply calculating means 34 for calculating a target hot water supply from the target water level. Further, the controller 3 is connected with an operation device 35 and a display device 36.

The controller 3 includes an incoming water temperature thermistor 1
0, an incoming water flow sensor 11, an outlet hot water thermistor 13, a hot water supply flow sensor 16, a water flow switch 23, an output signal from a hot water temperature thermistor 24 for a bathtub, a water level sensor 25, and operation instruction data from an operation device 35 and hot water supply temperature. Setting data and the like are input. Then, the controller 3 controls the hot water level servo 1 of the hot water supply means 1 according to the input data.
2. The amount of heating to the electromagnetic valve 15 and the hot water supply heat exchanger 4 and the amount of heating to the circulation pump 20 and the bathtub heat exchanger 21 of the reheating unit 2 are controlled.

The operating device 35 includes switches for setting various operation modes such as "automatic filling operation" and switches for setting a target water level of the bathtub 9 and a target hot water supply temperature in "automatic filling operation". The display 36 displays hot water supply temperature, hot water level, and the like.

Next, the operation of the above-described automatic hot water filling apparatus for performing an automatic hot water filling operation of the bathtub 9 at a predetermined target water level will be described with reference to the flowcharts of FIGS.

FIGS. 3 and 4 are operation flowcharts when the automatic hot water filling operation is performed for the first time. In STEP1,
When the user operates a hot water switch (not shown) provided in the operation device 35, the hot water mode is set, and hot water filling operation to the bathtub 9 by the hot water control means 30 is started.
In STEP 2, 50 liters of hot water is supplied to the bathtub 9.
The amount of 50 liters is set so that the water level of the hot water supply port 22 does not reach when the hot water supply is started from an empty state of the bathtub 9.

The loop from STEP 3 to STEP 4 is an operation for detecting the water level of the hot water supply port 22 by the hot water supply water level detection means 32 provided in the hot water filling control means 30. The hot water supply water level detecting means 32 supplies hot water at a rate of 10 liters in STEP 23 and checks whether or not the water flow switch 23 is turned on in STEP 4 when the circulating pump 20 is operated in STEP 3, whereby the water level in the bathtub 9 is checked. Has reached the hot water supply port 22.

That is, when the water level in the bathtub 9 reaches the hot water supply port 22, the circulation path 14 is filled with hot water even if the hot water supply to the bathtub 9 is stopped (the solenoid valve 15 is closed). When the circulation pump 20 is operated in this state, the hot water recirculates in the circulation path 14 and the water flow switch 23 is turned on. On the other hand, when the water level in the bathtub 9 has not reached the hot water supply port 22, when the hot water supply to the bathtub 9 is stopped, the circulation path 14 becomes empty, so that even when the circulation pump 20 is operated, the water flow switch 23 is not turned on. . Therefore, the water flow switch 23 is turned on in STEP4.
When it is detected that the water level has been reached, it can be determined that the water level in the bathtub 9 has reached the hot water supply port 22.

During the detection of the water level of the hot water supply port 22, the STE
In P21, the accumulated value of the hot water supply amount by the hot water supply amount accumulating means 31 is 3
When the water volume is equal to or more than 00 liters, the drain port (not shown) of the bathtub 9 may be open. In this case, the process proceeds to STEP 22 to stop the filling operation, and an error is displayed on the display 36.

When it is detected in STEP 4 that the water flow switch 23 has been turned ON, the filling system 30
In step 5, the operation of the circulation pump 20 is stopped, and in step 6
And the detected water level of the water level sensor 25 at that time is set to the reference water level H _0.
(See FIG. 2).

STEP 7 to STEP 11 are flow charts for calculating the cross-sectional area of the bathtub 9 by the cross-sectional area calculating means 33 provided in the hot water filling control means 30.

Referring to FIG. 2, the sectional area calculating means 33 includes:
The reference water level H mentioned above₀ Additional hot water for a predetermined amount Vx from
The water detected by the water level sensor 25 when the additional hot water is supplied.
Rank H _r From the water level rise h due to additional hot water supply₁(H₁=
H_r -H₀ By dividing Vx by), the cross-sectional area of bathtub 9 is calculated.
Put out.

Here, assuming that the predetermined amount Vx is a fixed value, V
Increase in water level in bathtub 9 when additional hot water is supplied for x minutes
Quantity h₁Varies depending on the size of the bathtub 9. Immediately
When the volume of the bathtub 9 is large, h₁Bath becomes smaller
When the volume of the tank 9 is small, h ₁Becomes larger. Soshi
And h₁Is small, the effect of the detection error of the water level sensor 25
And the calculation error of the cross-sectional area of the bathtub 9 increases.
There is an inconvenience. In addition, the volume of the bathtub 9 is small.
V_xWater level H when additional hot water is supplied_r
But hot water target water level H_aThe inconvenience of exceeding
is there.

Therefore, it should be noted that such inconvenience occurs.
In order to prevent this, the cross-sectional area calculation means 33 uses the bathtub in STEP7.
The larger the volume of 9 is, the more the additional hot water is supplied in STEP 8
Quantity V _xSet many. And additional hot water in STEP9
The water level Hr at the end is detected by the water level sensor 25, and
Standard water level H at 10₀ H₁And calculate the STE
At P11, the sectional area Ms of the bathtub 9 (Ms = Vx / h)₁)
Put out.

Then, the hot water filling control means 30
At 12, the target water level Ha is converted into a target hot water supply Va based on the cross-sectional area Ms of the bathtub 8 (Va = h ₂ × Ms, see FIG. 2). At STEP 13, hot water for the target hot water supply Va is supplied to fill the hot water. End the operation.

As a method of instructing the cross-sectional area calculating means 33 of the volume of the bathtub 9, the state in which the bathtub 9 is empty is set in STEP.
Until the water flow switch 22 is turned on in step 4, the hot water supply amount accumulated by the hot water supply amount accumulating means 31 is larger, and the volume of the bathtub 9 is designated by the user or the installer to indicate that the volume of the bathtub 9 is larger. A method of providing a bathtub volume designating means is adopted.

Alternatively, the cross-sectional area calculating means 33
In the course of the additional hot water supply after the water flow switch 22 is turned on (reference water level H ₀ ) at 4, the water level sensor 25 detects the water level in the bathtub 9 at the time when a certain amount of hot water is supplied from the reference water level H _0. and the difference between the water level and the reference level H ₀ detected, calculates the Ryakudan area tub from said predetermined amount, the larger the symbolic cross section, a method of determining the volume of the bath 9 is large is adopted You.

In the second or subsequent automatic hot water filling operation,
Since the cross-sectional area Ms of the bathtub 9 has already been calculated at the time of the first automatic hot water filling operation, the processing in STEP6 to STEP11 becomes unnecessary, and in STEP12 the target water level Ha is converted into the target hot water supply amount Vb (Vb = ha × Ms, 2), STE
Hot water is supplied by supplying the target hot water supply amount Vb at P13, thereby executing hot water filling.

Next, a second embodiment of the present invention will be described. The configuration of the automatic hot water filling device according to the second embodiment is the same as that of the first embodiment, and the method for calculating the cross-sectional area of the bathtub 9 is different.

That is, in the second embodiment, the calculation of the sectional area of the bathtub 9 is executed twice. When the first (first time) automatic hot water filling operation is performed, S in the flowcharts of FIGS.
The predetermined area Vx for additional hot water supply is set as a fixed value in TEP 7 to calculate the cross-sectional area Ms1 of the bathtub 9. The first calculation of the cross-sectional area of the bathtub 9 is a process for instructing the cross-sectional area calculating means 33 of the volume of the bathtub 9.

When the second filling operation is performed, the sectional area calculating means 33 determines in step 7 that the larger the sectional area Ms1 of the bathtub 9 (proportional to the volume of the bathtub) calculated at the time of performing the first filling operation. In step 8, the predetermined amount Vx for performing additional hot water supply is set to a large value, and the sectional area Ms of the bathtub 9 is calculated.

Thus, similarly to the first embodiment, when the volume of the bathtub 9 is large, the rise in the water level of the bathtub 9 due to the additional hot water supply of Vx is prevented from decreasing, and the detection error of the water level sensor 24 is reduced. The cross-sectional area of the bathtub 9
s can be calculated accurately.

In the first and second embodiments, the bathtub 9 having a constant cross-sectional area has been described as an example. However, when the cross-sectional area of the bathtub becomes larger toward the top, the bathtub is not used. The increase rate of the cross-sectional area may be obtained, and the hot water supply amount may be determined according to the water level of the bathtub in consideration of the increase rate.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an example of an automatic hot water filling device of the present invention.

FIG. 2 is an explanatory diagram of a water level change when hot water is applied to a bathtub.

FIG. 3 is a flowchart for explaining an automatic filling operation.

FIG. 4 is a flowchart for explaining an automatic filling operation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hot-water supply means, 2 ... Additional heating means, 3 ... Controller, 4
... Heat exchanger for hot water supply, 5 ... water pipe, 6 ... normal water pipe, 7 ...
Hot water supply channel for bath tub, 8 ... water pipe for bath tub, 9 ... bath tub, 10 ... incoming water temperature thermistor, 11 ... incoming water flow sensor, 12 ... hot water volume servo, 13 ... outgoing water temperature thermistor, 14 ... circulation path, 15 ...
Solenoid valve, 16 hot water supply flow sensor, 17 hopper, 18
... check valve, 19 ... three-way valve, 20 ... circulation pump, 21 ... heat exchanger for bathtub, 22 ... hot water supply port, 23 ... water flow switch, 2
4 ... bath temperature thermistor for bathtub, 25 ... water level sensor, 30 ...
Hot water filling control means, 31 hot water supply amount accumulating means, 32 hot water supply water level detecting means, 33 cross-sectional area calculating means, 34 target water supply amount calculating means, 35 operating device, 36 display

Claims (5)

[Claims] 1. A hot water supply means connected to a hot water supply port provided in a bath tub through a hot water supply path to supply hot water to the bath tub, and a water level sensor provided in the hot water supply path to detect a water level in the bath tub. A flow rate sensor for detecting a flow rate of hot water supplied from the hot water supply port to the bathtub; a hot water supply amount accumulating means for calculating a cumulative hot water supply rate to the bathtub from a detection value of the flow rate sensor; A hot water supply water level detecting means for detecting that the water has exceeded the hot water supply means, and a hot water filling control means for supplying hot water at a predetermined target water level to the bath tub via the hot water supplying means; After the hot water supply is started, the detected water level of the bath tub by the water level sensor at the time when the water level of the bath tub reaches the hot water outlet by the hot water outlet water level detecting means is set as a reference water level, and a predetermined amount of additional hot water is supplied from the reference water level. At the end of the additional hot water supply A difference between the detected water level of the bathtub by the water level sensor and the reference water level, and a cross-sectional area calculating means for calculating a cross-sectional area of the bathtub based on the predetermined amount; and a cross-sectional area of the bathtub calculated by the cross-sectional area calculating means. And a target hot water supply amount calculating means for calculating a target hot water supply amount according to a difference between the reference water level and the target water level, based on the water level of the bath tub reaching the reference water level after the start of hot water supply to the bath tub. In the automatic hot water filling apparatus for supplying hot water to the target water level by supplying hot water until the cumulative value of the hot water supply amount by the cumulative value calculating means of the present invention reaches the target hot water supply amount, the cross-sectional area calculating means may include: An automatic hot water filling apparatus characterized in that the larger the volume of the bathtub, the larger the amount of the fixed amount is set. 2. A bathtub volume designating means for designating a bathtub volume by an operation of a user or an installer, wherein said cross-sectional area calculating means designates a bathtub volume by said bathtub volume designating means. The automatic filling system according to claim 1, wherein 3. A method according to claim 1, wherein said cross-sectional area calculating means calculates a cumulative amount of the hot water supplied from the empty bath tub until the water level in the bath tub is detected by the hot water level detecting means to exceed the hot water port. 2. The automatic hot water filling apparatus according to claim 1, wherein the volume of the bathtub is indicated by the hot water supply amount. 4. The method according to claim 1, wherein the cross-sectional area calculating means is configured to perform a predetermined amount of additional hot water supply from the reference water level and, when a predetermined amount of hot water is supplied from the reference water level, use the water level sensor to detect a water level in the bathtub. Detecting the difference between the detected water level and the reference water level, and calculating the approximate sectional area of the bathtub based on the constant amount, and recognizing the volume of the bathtub based on the approximate sectional area. The automatic hot water filling device according to 1. 5. A hot water supply means connected to a hot water supply port provided in a bathtub through a hot water supply path to supply hot water to the bathtub, a water level sensor provided in the hot water supply path to detect a water level in the bathtub,
A flow rate sensor for detecting a flow rate of hot water supplied from the hot water supply port to the bathtub, a hot water supply amount accumulating means for calculating a cumulative hot water supply rate to the bathtub from a detection value of the flow rate sensor, and a water level of the bathtub exceeds the hot water supply port. A hot water supply water level detecting means for detecting that the hot water is supplied to the bathtub through the hot water supply means at a predetermined target water level. After the start, the detected water level of the bath tub by the water level sensor at the time when the water level of the bath tub reaches the hot water port by the hot water level detecting means is set as a reference water level, and a predetermined amount of additional hot water is supplied from the reference water level. A cross-sectional area calculating means for calculating a cross-sectional area of the bath tub based on a difference between a detected water level of the bath tub by the water level sensor at the end of the additional hot water supply and the reference water level, and the predetermined amount; Bath calculated by A target hot water supply calculating means for calculating a target hot water supply amount according to a difference between the reference water level and the target water level based on a cross-sectional area of the bath; In an automatic hot water filling apparatus that supplies hot water up to the target water level by performing hot water supply until the cumulative value of the hot water supply amount by the cumulative value calculating means after reaching the water level reaches the target hot water supply amount, The means calculates the cross-sectional area of the bathtub twice, sets the predetermined amount to a predetermined reference amount at the time of the first calculation of the cross-sectional area of the bathtub, and sets the predetermined amount at the time of the second calculation of the cross-sectional area of the bathtub. An automatic hot water filling apparatus, wherein the fixed amount is set to be larger as the cross-sectional area of the bathtub calculated at the time of the first cross-sectional area calculation is larger.