JP2551662B2 - Automatic water filling device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automatic water filling device that includes a water level sensor that detects a water level in a bathtub and that performs water filling according to a set water level.

[Prior Art] As an automatic filling device, there is an automatic filling device that detects the water level in a bathtub by a water level sensor and stops the water filling when the detected water level reaches a set water level.

[Problems to be Solved by the Invention] However, in a bathtub to be filled with a filling device,
Since there are various shapes and volumes, if you try to stop the filling when the water level in the bathtub reaches the set water level, you must always detect whether the water level in the bathtub reached the set water level. It is not possible to increase the filling flow rate because it must be done. Therefore, there is a problem that it takes time to fill the water.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an automatic water filling device that stops water filling according to a set water level, and can quickly fill the water in each bathtub.

[Means for Solving the Problem] The present invention forms a bath circulation path through an opening provided in a wall portion of a bathtub, connects the hot water supply pipe of the water heater to the bath circulation path, and further provides the hot water supply pipe. In an automatic water filling device that is provided with a water filling valve and opens the water filling valve in response to the operation of the water filling start instruction means, the water level setting for setting the water level higher than the opening of the bathtub. Means, a water level sensor provided in communication with the bath circulation path for detecting the water level of the bathtub, and a water amount detection for detecting the amount of filling water flowing from the hot water outlet pipe to the bathtub through the bath circulation path. Means, a filling water amount integrating means for integrating the filling water amount detected by the water amount detecting means, and a reference filling water detecting means for detecting whether or not the filling water is filled up to a reference water level for closing the opening of the bathtub. And the start of hot water filling In response to the first operation of the instructing device, the water amount detecting device detects the amount of water to be poured into the bathtub, and the first step of filling the water to the reference water level, and the summing of the amount of water to be filled in the first step. A second step of storing the value as the reference amount of water filling, and a third step of storing the detection value of the water level sensor at the end of the water filling of the first step as the reference detection value.
After the first step, and a fourth step of performing water filling to the minimum set water level based on the detection value of the water level sensor while detecting the amount of water filling the bathtub.
A fifth step of storing the integrated value of the amount of filling water in the fourth step as an additional amount of filling, and an initial filling operation for performing filling, and the filling start instructing means after the initial filling operation. A sixth step of calculating a target amount of water filling based on the set water level of the water level setting means, the reference amount of water filling and the additional amount of water filling stored in the initial water filling operation according to an operation; A seventh step of performing the water filling until the integrated value of the water filling water detected by the water amount detecting means reaches the target water filling amount;
After the water filling by the seventh step, there is an eighth step of performing the water filling until the detection value of the water level sensor reaches the set water level, and a subsequent water filling operation of performing the water filling. Use it as a means.

[Operation] In the present invention, when the start of the filling is first instructed by the filling start instructing means, as the initial filling operation, filling is first performed until the opening of the bathtub is closed. The amount of filling water is accumulated and stored as a reference amount of filling water, and at the same time, the detection value of the water level sensor at that time is stored as a reference detection value.

Then, the filling of water is further performed until the minimum set water level located above the opening of the bathtub is detected by the water level sensor. In this case, since the detection value of the water level sensor when the opening of the bathtub is blocked is stored as the reference detection value, it is detected by the water level sensor whether or not it becomes the lowest set water level that is higher than the opening. Can be easily identified by
At the time of this additional filling, the amount of filling water is integrated, and when the filling of water to the minimum set water level is completed, the integrated amount of filling water is stored as the additional filling amount.

At this time point, the reference amount of water filling and the amount of additional water filling corresponding to the minimum set water level are stored in the automatic water filling device.

After that, after the initial filling operation is performed, if the filling start instructing means is operated in order to perform the filling again,
This time, the subsequent filling operation is performed instead of the initial filling operation.

In the subsequent filling operation, when the filling start instructing means is operated, the set water level set by the water level setting means, the reference filling amount and the additional filling amount stored in the initial filling operation are displayed. Based on the above, the target amount of filling water is calculated, the filling is performed until the integrated value of the amount of filling water detected by the water amount detecting means reaches the calculated amount of filling water, and the operation is temporarily ended. If the detected value of No. has not reached the set water level, the water filling is performed again, and if the detected value of the water level sensor has reached the set water level, the water filling is finished.

In this subsequent filling operation, the filling operation can be performed all at once until the integrated value of the filling amount or the calculated target filling amount is reached, so it is faster than when filling is performed while detecting the water level. Can be filled with hot water.

[Advantages of the Invention] In the present invention, when the filling of water is performed according to the first filling instruction, the standard filling amount and the additional filling amount according to the bathtub are automatically stored. The burden on the operator is small.

Further, in the present invention, since the amount of water filling from the reference water level to the minimum set water level is set as the additional water filling amount, no matter what level of water level is set by the user during the initial water filling operation, the additional water filling is surely performed. The amount of tension can be detected and stored.

In addition, at the time of the second and subsequent fillings of water, when the water level is set, the amount of filling water is automatically calculated according to the bathtub, and filling of water is performed according to the amount of filling water. You can fill it with water.

EXAMPLES Next, the present invention will be described based on examples.

The gas hot water bath system 1 shown in FIG. 1 is a combined hot water supply system having functions such as an automatic hot water filling function and a reheating function, and is designed to supply water passing through a water pipe 10 connected to a water supply source such as water supply. Heat it up to some hot water inlet A and bath B
A main heater 2 for supplying hot water to the bath, a bath heater 3 for circulating and heating hot and cold water in the bathtub B, and connecting the respective heaters 2, 3 and the hot water supply port A and the bath B to water. It consists of several pipes forming a circuit.

The water pipe 10 is provided with a flow rate sensor 31 for detecting the flow rate of passing water, and a feed water temperature thermistor 32 for detecting the temperature of the supplied water, and the water pipe 10 is branched downstream of these, Is connected to the main heat exchanger 11 of the main heater 2, and the other is a bypass pipe 12 that bypasses the main heat exchanger 11,
The bypass pipe 12 is provided with a bypass solenoid valve 13 that is opened as needed.

In the hot water outlet pipe 14 where the main heat exchanger 11 and the bypass pipe 12 join, an electric hot water amount servo 15 in which a valve element is driven by a gad motor to limit the amount of hot water flowing out, and a hot water outlet for detecting hot water temperature. A hot thermistor 33 is provided, and a hot water pipe 14
Are branched downstream of these, and one of them serves as a hot water supply pipe 16 to each hot water supply port A, and the other serves as a connection pipe 17 to the bath heater 3.

The connection pipe 17 has a water amount sensor for detecting the amount of water filling.
34, a vacuum breaker 35 that opens the hot water supply circuit to the atmosphere so that hot water in the bathtub does not flow backwards when water is cut off, a water filling valve 18 consisting of a ball valve that is opened when filling water, hot water in bath B Two check valves 19, 19a are provided to prevent backflow.

The connecting pipe 17 is branched into two upstream of the bath heater 3,
One is a water filling pipe 20 to the bathtub B and is connected to the bathtub B, and the other is connected to one side of the bath heat exchanger 21 of the bath heater 3.

The other side of the bath heat exchanger 21 is a circulation pipe 22 connected to the bath B in the same manner as the filling pipe 20 for circulating hot water from the bath B. A water level sensor 36, a pump 23, an opening / closing valve 24, a water flow switch 37, and a bath thermistor 38 are provided in order from the bath B side.

The water level sensor 36 uses a piezoresistive effect in which the electric resistance of the conductive layer changes when a conductive layer is formed by diffusion on a single crystal substrate made of a semiconductor such as silicon or germanium and the crystal is distorted by applying a force. A semiconductor diffusion resistance type pressure sensor is incorporated in a diaphragm chamber, one of which is connected to the circulation pipe 22 and the other of which is open to the atmosphere, and the resistance value according to the water level of the bath B can be detected.

When the pump 23 is energized, the pump 23 rotates at a constant speed and pumps the hot and cold water in the bathtub B from the circulation pipe 22 to provide a bath heat exchanger.
It is sent to 21, and is circulated again from the water filling pipe 20 to the bathtub B.

The on-off valve 24 is a rotary valve that drives a pipe-shaped valve body that allows hot water to pass in either direction by a servomotor, and when the open state is in the open state, the circulation pipe 22 and the spout pipe 20 are connected via the bath B. This is for closing the circulation pipe 22 when the pump 23 is stopped in order to form a bath circulation path and to detect the water level by the water level sensor 36.

Also, when the main heater 2 is filled with hot water, the open state
The filling of water is possible not only from the filling pipe 20 but also from the circulation pipe 22.

The water flow switch 37 is for detecting whether or not hot water is passing through the circulation pipe 22 when the pump 23 is operated, and detects the water flow when the hot water is poured in the opposite direction. do not do.

The bath thermistor 38 detects the temperature of the hot water in the bathtub B when the pump 23 is operated.

The main heater 2 heats the main heat exchanger 11 by performing combustion by the hot water supply burner 4 when water passes through the water pipe 10.

The fuel pipe 40 to the hot water supply burner 4 is provided with an original solenoid valve 40a for stopping all fuel supply, and downstream thereof, a governor proportional valve 41 for adjusting the fuel supply amount according to the required heating amount and a governor proportional valve 41. , Solenoid valves 42 and 43 for controlling the number of burners to be used out of all burners of the hot water supply burner 4 are provided.
Combusts by mixing the fuel gas regulated by these valves with the combustion air supplied by the hot-water blower 44.

The bath heater 3 has a bath fuel pipe 45 branched from the fuel pipe 40.
The fuel gas supplied from the above is burned in the bath burner 5 by the combustion air supplied from the bath blower 46 to heat the bath heat exchanger 21.

The bath fuel pipe 45 has a governor 47 for keeping the supply gas pressure constant and a bath solenoid valve 48 for controlling fuel supply. The bath burner 5 has a solenoid valve 49 for controlling the number of burners to be used.
Are provided respectively.

The gas hot water bath system 1 having the above configuration is
It is controlled by the control device 50 shown in the figure.

The control device 50 is mainly composed of a microcomputer, and the functional configuration thereof includes a hot water supply control unit 51 for controlling the main heater 2 and the water circuit, a bath combustion control unit 56 for controlling the bath heater 3, and It is roughly divided into a sequence control unit 57 for controlling a sequence, and is additionally provided with a main remote controller 60 and a flow remote controller 70 which are respectively installed in a kitchen or a bathroom, and a communication interface 58 for communication with each remote controller 60, 70. have.

Each remote controller 60, 70 is equipped with a small-capacity microcomputer that operates by the electric power supplied from the control device 50, and is connected to the control device 50 by two electric wires that both supply electric power and transmit signals. There is.

For each remote control 60, 70, as a preliminary operation switch,
There is a "setting switch" for setting the hot water supply temperature or filling temperature, setting the boiling time or setting the amount of filling water, and a "selection switch" for selecting the mode of the setting switch. "Hot water switch" to specify hot water supply or hot water filling, "Fully automatic switch", "Hot water switch" to raise or lower hot water filling temperature by a predetermined temperature than the preset temperature for automatic hot water filling There is a "lubricious water switch" and a "plenty switch" for increasing the amount of hot water so that the water level is higher by a predetermined water level than the preset water level when automatic hot water filling is performed.

Further, each remote controller 60, 70 has a display unit for displaying the setting state, the current time, etc., and a buzzer that operates at the end of the filling with water.

With respect to the setting contents of the switches of the remote controllers 60 and 70, every time a setting operation is performed, a transmission signal which is modulated by a predetermined carrier system by a microcomputer is transmitted, and the control device is controlled.
Stored within 50.

The hot water supply control unit 51 of the control device 50 is a communication interface.
According to the operation signal transmitted via 58, the main heater 2 is operated to perform hot water supply control or automatic water filling control.

The hot water supply control is performed when the hot water supply switch is operated. When the hot water supply port A connected to the hot water supply pipe 16 is opened and the water flow is detected by the flow rate sensor 31, the hot water supply burner 4 is burned and the hot water is burned. Combustion stops when the water stops.

In the automatic water filling control, when the fully automatic switch is operated, the water filling burner 4 is burned by opening the water filling valve 18 and starting water flow, and the water filling at the predetermined water level in the bathtub B is completed. Then, the water flow is stopped and the combustion of the hot water supply burner 4 is stopped.

 Hereinafter, the hot water supply control unit 51 will be described for each functional unit.

The detection data processing unit 52 is a part that performs a predetermined correction in order to use the detection signal from each sensor provided in each pipe such as the water pipe 10 and the connection pipe 17 as effective information, for example, a flow rate sensor. The time between the pulses of the pulse signals emitted from the water amount sensor 31 and the water amount sensor 34 is averaged, and the water amount value is calculated based on the average value and used for the processing of other functional units.

Alternatively, in consideration of the detection delay of each thermistor, the actual temperature from the change state of the detected temperature is estimated and used to reduce the response delay of the heating amount when the detected temperature changes.

The temperature control unit 53 stores the correction data based on the feed water temperature thermistor 32, the hot water temperature thermistor 33, and the flow rate sensor 31, which have been subjected to a predetermined process by the detection data processing unit 52, and transmitted and stored in advance by the communication interface 58. The required heating amount of the hot water supply burner 4 is calculated from the set temperature data of each remote controller.

The combustion control unit 54 controls the hot water supply blower 44, the original solenoid valve 40a, the solenoid valves 42, 43, and the ignition electrode 4a provided in the hot water supply burner 4 in a predetermined sequence according to the water flow information based on the flow rate sensor 31. In addition to controlling the ignition of the hot water supply burner 4, fire extinguishing control is performed based on the water flow stop information. Further, in the fuel of the hot water supply burner 4, the hot water supply blower 44, the governor proportional valve 41, and the solenoid valve 42 are controlled on the basis of the required heating amount calculated by the temperature control unit 53 to control the combustion amount of the hot water supply burner 4. do.

Here, the operation of the hot water blower 44 is detected by the number of rotations, the hot water blower 44 is controlled according to the required heating amount,
Depending on the operation of the hot water blower 44 detected by the number of revolutions,
The governor proportional valve 41 is controlled.

During combustion, flame detection is performed by the flame rod 4b provided in the hot water supply burner 4, and in the case of misfire, the solenoid valves such as the original solenoid valve 40a are closed to stop the fuel supply and stop the combustion. To do.

The respective functions of the detection data processing unit 52, the temperature control unit 53, and the combustion control unit 54 are the same without distinction between hot water supply control and automatic water filling control.

During the hot water supply control and the hot water filling control, the water amount control unit 55 reduces the passage flow rate of the hot water amount servo 15 to reduce the hot water supply flow rate when the hot water discharge temperature does not reach the set temperature even by the maximum combustion amount of the hot water supply burner 4. Alternatively, the hot water supply flow rate is limited, and when the combustion amount of the hot water supply burner 4 has a margin, the hot water supply servo 15 is increased in flow rate to increase the hot water supply flow rate or the hot water flow rate.

In this case, the voltage applied to the gad motor of the hot water servo 15 is kept constant in order to quickly drive the hot water servo 15 to the target flow rate and to obtain a sufficient drive torque for the water pressure. The voltage is continuously applied until the flow rate detected by the flow rate sensor 31 falls within a predetermined range with respect to the target flow rate, and when the flow rate is within the predetermined range, pulses of the same voltage are applied at intervals to gradually increase the voltage. Change to the target flow rate.

Further, the water amount control unit 55 opens the bypass solenoid valve 13 to guide unheated water to the hot water outlet pipe 14 both when hot water is filled and when water is filled, especially when the set temperature is relatively low and a large amount of hot water is required. At the same time, a large amount of hot water is supplied in a short time by utilizing the heating capacity of the hot water supply burner 4 to burn as much as possible.

In the automatic filling control, the filling water amount calculation control is performed in the case of the first filling such as when the installation work is completed, and the normal filling control is performed in the second and subsequent filling.

In this embodiment, the water level n set by each remote controller has six levels from water level 1 to water level 6, and as shown in FIG. 3, the circulation pipe connected to the bathtub B. When the depth of 22 is the reference level H and the depth to the reference level H is hcm, the depth of each of the other water level levels n is {h + 10} cm for the water level 1 and {h + 15} for the water level 2. The water level 6 is {h + 35} cm.

The filling water amount calculation control is a control for previously calculating and storing the amount of hot water supply Wa corresponding to the set water level according to the shape and size that differ depending on the bathtub, as shown in FIG.
This is done as follows.

In the filling water amount calculation control, it is assumed that any one of the above water level levels n is designated, or if the water level level 1 is designated, the filling amount up to the water level level n is detected by the water amount sensor 34. And water level sensor 36
Based on the detected water level of.

In the first stage, the water level sensor 36 is not used to detect the water level, and the amount of hot water W0 required for filling the water up to the reference level H is obtained. First, the water amount sensor 34 supplies 10 hot water (step 1), This hot water supply amount is used as an initial value for integration (step 2).

After that, the pump 23 is operated to determine whether or not the water is filled up to the reference level H to which the circulation pipe 22 is connected, depending on whether or not the water flow switch 37 is operated (step 3).

If the hot water is not filled up to the reference level H (NO in step 3), 10 more hot water is supplied (step 1), and this hot water supply amount is added to the previous initial value to make an integrated value (step 2). Similarly, it is determined whether or not the filling is performed up to the reference level H (step 3).

Thereafter, hot water is supplied in increments of 10 until the water flow switch 37 detects the water filling up to the reference level H, and the amount of water filling is integrated at this time.

When it is detected that the filling is performed up to the reference level H (YES in step 3), the integrated value of the amount of filling up to that point is stored as the hot water supply amount W0 (step 4).

At this time, the detection value of the water level sensor 36 is stored as the reference detection value at the reference level H.

Next, as a second step, hot water supply is continued based on the detection information from the water level sensor 36 (step 5), and the flow rates after reaching the reference level H are integrated (step 6).

When the detected water level reaches the water level 1 (YES in step 7), the integrated flow rate value up to the water level corresponding to the water level 1 is stored as the hot water supply amount W1 (step 8), and no further integration is performed.

When the set water level is water level 1, hot water supply is stopped at this time.

When the set water level is another water level n, hot water is continuously supplied, and when the water level detected by the water level sensor 36 reaches the set water level n (step 9).
YES), the hot water supply is finished (step 10), and the filling water amount calculation control is finished.

In the automatic hot water removal control after the hot water supply amount W0 required up to the reference level H and the hot water supply amount W1 required up to the water level level 1 are stored by the above-described hot water filling amount calculation control, normal hot water filling control is performed. As shown in FIG. 5, filling is performed as follows.

When the set water level is instructed by the remote controller and the fully automatic switch is operated, the water filling amount Wa is calculated by the following equation according to the water level level n (step 11).

Wa = W0 + (W1 / 10) × 5 × (n + 1) And when the filling is started (Step 1
2) The water filling flow rate is detected by the water amount sensor 34 and integrated to obtain the water filling integrated value w (step 1
3).

The filling is performed until the accumulated filling value w reaches the filling amount Wa, and when the accumulated filling value w reaches the filling amount Wa (YES in step 14), the filling is temporarily stopped (step 15). .

After that, the pump 23 is operated, the water level is detected by the water level sensor 36, and it is determined whether or not the water level in the bathtub B has reached the set water level. If the set water level is reached (step 16) In YES), the filling control is ended.

If the water level is lower than the set water level (N in step 16
O), as a filling correction control (step 17), the filling valve 18 is opened again to perform filling, and the filling is extended until the set water level is reached. close.

In this normal hot water filling control, the open / close valve is used to speed up the hot water filling time, especially when the hot water supply capacity is sufficient.
Open 24 and fill the circulation pipe 22 with hot water.

In this case, the on-off valve 24 is normally opened except when the temperature is kept warm.
When 18 is opened, a large shock is applied when hot water flows into the circulation pipe 22, and the water level sensor 36 installed in the circulation pipe 22
Since it may be damaged, the water filling valve 18 is opened after confirming that the open / close valve 24 is controlled to the closed state by the limit switch 24a provided on the valve body of the open / close valve 24. When 24 is open, the water filling valve 18 is opened after being closed once, and the on-off valve 24 is opened again after the water filling valve 18 is opened.

For the same reason, when the on-off valve 24 is opened and the water filling valve 18 is closed when the water filling is performed, the on-off valve 24 is closed to prevent a water hammer from being applied to the water level sensor 36. Close the water filling valve 18.

Further, when the filling of water with the amount of filling Wa is completed and the filling is corrected by detecting the water level, the pump 23 is once operated to check whether the filling of the bath B is performed or not.
Make sure that you have remembered to close the plug in, and then fill the water with the water level.

In the case of fully automatic operation, heat retention control is performed until 4 hours have passed, and even after the filling of water is completed, in order to supplement the amount of hot water decreased by bathing and maintain the water level in bathtub B at the set water level, The on-off valve 24 is closed to grasp the change of the water level based on the detection information of the water level sensor 36, and when the detected water level is lower than the set water level by a predetermined value (for example, 5 cm), the water filling valve 18 is opened. , Add water until the set water level is reached, and close the water filling valve 18 when the set water level is reached.

Further, in order to keep the temperature of the hot water in the bathtub B at a constant temperature, the pump 23 is set every predetermined time (for example, 30 minutes) after the filling of the hot water is completed.
Is operated to circulate the hot water in the bath circulation path composed of the water filling pipe 20 and the circulation pipe 22, and the bath thermistor 38 detects the hot water temperature.

At this time, the on-off valve 24 is once opened before operating the pump 23, and then the pump 23 is driven.

Therefore, when the on-off valve 24 is open or when the pump 23 is operating, the correct water level cannot be detected,
To read the detection information of the water level sensor 36 for the foot bath,
This is performed only when it is confirmed that the pump 23 is stopped and the on-off valve 24 is closed, and in other cases, the detection information of the water level sensor 36 is not read.

In the fully automatic operation, the bath combustion control unit 56 sets a predetermined value when the hot water temperature is lower than the set temperature when the hot water temperature is detected by the bath thermistor 38 every predetermined time after the hot water filling is completed. In this sequence, the bath blower 46, the bath solenoid valve 48, and the ignition electrode 5a provided in the bath burner 5 are controlled to control the ignition of the bath burner 5, and the water flow in the bath circulation path is accompanied by the operation of the pump 23. Heating is performed while being detected by the switch 37, and heating is performed until the temperature of hot water circulating in the bath circulation path rises to a set temperature.

The amount of combustion of the bath burner 5 during combustion is determined by the solenoid valve 49 which is controlled according to the temperature difference between the detected temperature and the set temperature.

Further, the flame of the bath burner 5 is detected by the frame rod 5b provided in the bath burner 5, and when misfire occurs, the fuel supply is stopped and the combustion is stopped.

The sequence control unit 57 controls the hot water supply burner 4 or the bath burner 5 by the hot water supply control unit 51 or the bath combustion control unit 56.
When the ignition is controlled, the original solenoid valve 40a is opened to supply the fuel and burn the fuel.

In addition, it has a clock function for notifying the current time, is equipped with a timer 57a for setting the boiling time, measures the time according to the setting signal from each remote controller 60, 70, and 30 minutes before the setting time. In addition to starting the automatic hot water filling control by the hot water supply control unit 51, after the completion of the hot water filling, the time is maintained to keep the temperature warm, and after the boiling time, the hot water supply control unit 51 performs the warming control until four hours have elapsed. To do.

The communication interface 58 is a signal conversion circuit for exchanging information between the control device 50 and each remote controller. Based on a setting signal transmitted each time the remote controller performs a setting operation, the set temperature and the setting are set. Information such as water level and boiling time is transferred to other functional units.

Next, the operation relating to the filling of the gas hot water bath system 1 of the present embodiment configured as described above will be described with reference to FIG.

When the installation work of the gas hot water bath system 1 is completed and the filling of water is instructed for the first time (in step 20, YE
S), filling water amount calculation control shown in FIG. 4 (step 21)
Thus, the hot water supply amount W0 and the hot water supply amount W1 are integrated and stored.

After that, when the second and subsequent filling of water is instructed (NO in step 20), the normal filling of water (step 22) shown in FIG. 5 is performed.

In the normal water filling control, the water filling is performed based on the water amount sensor 34 until the water filling amount Wa corresponding to the set water level n is reached.
The water level sensor 36 detects the water level and corrects the water filling. When the set water level is reached, the water filling valve 18 is closed and the water filling is completed.

In this case, when the filling of water is started, it is determined whether or not the open / close valve 24 is open, and the open / close valve 24 is open and the pump is open.
When 23 is operating, water filling control is not performed, and when the on-off valve 24 is closed and the pump 23 is stopped,
Filling control is started.

At this time, if the hot water supply burner 4 has sufficient capacity, the on-off valve 24 is opened after the water filling valve 18 is opened, and the water filling pipe 20 and the circulation pipe 22 are filled into the bath B. .

When the normal water filling control is over, the water temperature is controlled and the water level sensor 36 continuously detects the water level in the bathtub B. When the water level falls below the set water level by a certain level, the water filling valve 18 opens to add hot water. To be done.

Further, when the open / close valve 24 is opened and the pump 23 is operated and the temperature of the hot water in the bathtub B is detected by the bath thermistor 38 at predetermined time intervals, and the hot water temperature in the bathtub B has decreased by a certain temperature or more, The reheating is performed by the bath burner 5.

At this time, for example, even if an instruction to fill the water is made by mistake, since the on-off valve 24 is open, the water filling valve 18 is not opened and the water filling is not performed.

As described above, in the present embodiment, once the water filling is performed, the water filling amount is controlled by the water amount detected by the water amount sensor from the second time, so that the water filling flow rate can be increased.

 Therefore, the filling of water can be completed in a short time.

In the above embodiments, the gas hot water bath system is shown, but the present invention can also be applied to a burner using other fuel such as oil or a hot water filling device using electric heat.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a gas hot water bath system showing an embodiment of the present invention, FIG. 2 is a functional block diagram of a control device of the present embodiment, and FIG. 3 is a set water level and a bathtub by a remote controller in the present embodiment. 4 is a flow chart showing the filling water amount calculation control of the present embodiment, FIG. 5 is a flow chart showing the normal filling control of the present embodiment, and FIG. 6 is a control of the present embodiment. 3 is a flow chart showing a module. In the figure, 1 ... Gas hot water bath system (automatic water filling device), 17 ... Connection pipe (hot water supply pipe of the water heater), 18 ... Water filling valve, 20 ... Water filling pipe (bath circulation path), 22 ...... Circulation piping (bath circulation path), 34 …… Water volume sensor (water volume detection means),
36: Water level sensor, 55: Water volume control unit (filling water amount integrating means, reference water filling detection means), 70 ... Flow remote control (filling start instruction means, water level setting means), B ... Bathtub.

Claims (1)

(57) [Claims] 1. A bath circulation path is formed through an opening provided in a wall portion of a bathtub, a hot water supply pipe of a water heater is connected to the bath circulation path, and a hot water filling valve is provided in the hot water supply pipe. In an automatic water filling device which opens the water filling valve according to the operation of the water filling start instruction means to fill the water, a water level setting means for setting a water level higher than the opening of the bathtub and the bath circulation path. A water level sensor provided in communication for detecting the water level of the bath, a water amount detecting means for detecting the amount of filling water flowing from the hot water outlet pipe to the bath via the bath circulation path, and the water amount detecting means. A filling water amount integrating means for adding up the detected filling water amount,
Reference water filling detection means for detecting whether or not water filling has been performed up to a reference water level that closes the opening of the bathtub, and according to the first operation of the water filling start instruction means, the water amount detection means A first step of performing water filling to the reference water level while detecting the amount of water filling the bathtub; a second step of storing the integrated value of the water filling water in the first step as a reference water filling amount; A third step of storing the detection value of the water level sensor at the end of the filling of water in the first step as a reference detection value, and after the first step, while detecting the amount of filling water in the bathtub, It has a fourth step of filling water to the minimum set water level based on the detection value of the water level sensor, and a fifth step of storing the integrated value of the filling water amount in the fourth step as an additional filling amount. In response to the initial filling operation for performing the filling and the operation of the filling start instructing means after the initial filling operation, the set water level of the water level setting means and the reference filling stored in the initial filling operation. A sixth step of calculating a target amount of filling water based on the amount and the additional amount of filling water, and filling is performed until the integrated value of the amount of filling water detected by the water amount detecting means reaches the target amount of filling water. A subsequent filling operation, which includes a seventh step and an eighth step after the filling step according to the seventh step, until the detection value of the water level sensor reaches the set water level. An automatic water filling device characterized by having.