JPH10132379A - Combined hot water feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable correction of the output of a pressure sensor to be easily carried out and shorten the time required to perform automatic hot water feeding operation. SOLUTION: In a combined hot water feeder comprised of a hot water feeding circuit 10 for heating fed water and supplying hot water, a circulation circuit 20 for circulating water in a bath tub and heating it and a hot water feeding circuit 30 for use in connecting the hot water feeding circuit 10 to the circulation circuit 20, a first valve S1 opened when the hot water is fed and a second valve S2 are arranged in series from the hot water supplying circuit within the hot water feeding circuit 30, a pressure sensor 33 is arranged between the first valve and the second valve through a three-way valve 32. There is provided a control section 40 for opening the first and second valves when hot water is fed to a bath tub 43, closing the first and second valves when the output of the pressure sensor is corrected, setting a three-way valve 32 at a position where the pressure sensor 33 is connected to the surrounding atmosphere and for sensing an output of the pressure sensor 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined hot water supply system comprising a hot water supply circuit for heating hot water to supply hot water, a circulation circuit for circulating and heating water in a bathtub, and a pouring circuit for connecting them. The present invention relates to a configuration capable of easily correcting a pressure sensor of a vessel.

[0002]

2. Description of the Related Art A complex type water heater having a hot water supply unit and a bath tub reheating unit and a hot water supply circuit and a pouring circuit for connecting the reheating unit is provided with a pressure sensor in a circuit connected to the bath tub. There is one that detects the water level in the bathtub.

In a water heater with a pressure sensor that is widely used at present, a pressure value in a pipe is stored as a pressure value of a reference water level at a reference water level above a circulating metal fitting of a bathtub in a storage mode performed at the time of construction. Then, at the time of actual operation, the pressure in the piping is detected by a pressure sensor via a circulation circuit connected to the bathtub, and the current water level of the bathtub is obtained by comparing the pressure value with the reference water level.

[0004]

However, widely used pressure sensors have fluctuations in the detection values and large fluctuations in the detection values due to aging, and it is necessary to frequently correct or calibrate the detection values. There is. A general pressure sensor has a diaphragm or the like inside, and the diaphragm is deformed by the pressure applied to the diaphragm,
The degree of the deformation is output as a detection value. Therefore, in the conventional water heater, the above-described reference water level state is reproduced by a complicated pouring process during the automatic hot water filling operation, and the detection value of the pressure sensor at that time is compared with the stored output value at the reference water level. Correction and calibration. This is because, in order to perform the correction at times other than the automatic hot water filling operation, it is necessary to pouring the bath so that the bathtub has the reference water level for the correction.

FIG. 6 is a flowchart of the automatic hot water filling operation. FIG. 7 is a reference diagram showing the water level in the bathtub 43 in the storage mode. FIG. 8 is a reference diagram showing the water level in the bathtub 43 during the conventional automatic hot water filling operation.

As shown in FIG. 7, immediately after the water heater and the bathtub are first installed, it is assumed that the inside of the bathtub is empty, and while pouring the water into the bathtub, the water amount Q up to the reference water level Pa is maintained.
a, the pressure sensor value at the reference water level and the bathtub area S are stored. For that purpose, it is confirmed by the water flow switch in the circulation circuit that the water level has reached the circulation fitting 44 in the bathtub, and the pouring amount up to the reference water level Pa above the circulation fitting 44 and the value of the pressure sensor are stored. Further, for example, 30 liters of water are poured and the area of the bathtub is calculated and stored from the pressure sensor value at the water level Pb and stored.

Next, the automatic hot water filling operation is started by setting a water level and a temperature from a remote controller and turning on an automatic switch as shown in a flowchart of FIG. 6 (S61). First, the circulation pump in the circulation circuit is operated (S62), and it is checked whether or not the bath water switch is off (S62).
63) If on, it is determined that there is more water remaining in the bathtub than the circulating metal fittings, and the operation shifts to reheating operation (S75). If off, first a small amount (10 liters) of the priming level of the circulation pump Is poured into the bathtub 47 by opening the pouring solenoid valve (S
64). Then, the circulating pump is turned on to check whether or not the water switch is off (S65, S66).
If it is on, the process proceeds to the reheating operation (S75), and if it is off, the amount of water reaching below the circulation fitting is poured (S6).
7). In the storage mode, the amount of water (10 + X liters) below the circulating metal fittings of the bathtub is stored. If the stored values are used, it is possible to know the amount of water required when the bathtub 47 is empty. Pouring of only that amount is performed.

Then, the pouring solenoid valve is closed, the circulation pump is turned on, and it is checked whether or not the bath water switch is off (S69). When the water level is higher than the circulation fitting, the water flow switch is turned on.
The operation shifts to 75), and if it is off, it is determined that the bath tub is initially empty, and the pouring solenoid valve is opened to pour the water to the reference water level A above the circulation fitting (S70). Also in this case, the value Y liter stored in the storage mode is used.

The circulation pump is turned on (S71), and after confirming that the bath water switch is on (S72), the circulation pump is stopped and the output from the pressure sensor is taken in (S73). The value of the pressure sensor detected at this time is a value corresponding to the reference water level Pa. Therefore, this detected value is compared with the sensor output value when pouring up to the reference water level above the circulating metal fitting stored in the storage mode, and if different, it means that the pressure sensor 45 has undergone aging. The water level pressure value is corrected to the new output value. Specifically, the data is rewritten to the nonvolatile memory connected to the microcomputer of the control device.

If it is determined in steps S63, 66, and 69 that there is a water level above the circulating metal fitting, the water is reheated to near the set temperature (S75). Thereafter, when the temperature rises to near the set temperature, the pressure value of the pressure sensor is detected (S76).

Thereafter, a step of pouring the molten metal to the set water level is performed according to steps S77, S78 and S79. In this pouring step, pouring is performed by opening the pouring solenoid valve, closing the pouring solenoid valve and stopping the circulation pump, and then the water level in the bathtub is detected by the pressure sensor. When it is determined that the set water level has been reached (S77), reheating is performed to the set temperature (S77).
80) Finally, a buzzer is output (S8).
1).

As described above, in order to perform correction and calibration based on aging of the pressure sensor, a small amount of water is poured and rotation of the circulation pump is performed during automatic filling operation when a filling command is received from the user. It is necessary to repeat the detection of the circulating water switch, and there is a problem that the time required for the automatic filling operation becomes long.

Accordingly, an object of the present invention is to provide a combined water heater that can easily perform correction and calibration of a pressure sensor at any time without the need to perform correction and calibration of a pressure sensor during automatic hot water filling operation. To provide.

[0014]

According to the present invention, there is provided a hot water supply circuit for heating hot water to supply hot water, a circulation circuit for circulating and heating water in a bathtub, and a hot water supply circuit. In a compound water heater having a pouring circuit for connecting a circulation circuit, a first valve which is opened at the time of pouring from the side of the hot water supply circuit in the pouring circuit, and a second valve are provided in series. A pressure sensor is provided between the first valve and the second valve via a three-way valve, and the first and second valves are opened when pouring into the bath, and the pressure sensor is corrected. A combined hot water supply comprising: a control unit for closing the first and second valves and setting the three-way valve to a position connecting the pressure sensor to the atmosphere and detecting an output of the pressure sensor. vessel. Is achieved by providing

Further, in the above invention, when the pouring is not performed, the control unit closes the first valve, opens the second valve, and connects the three-way valve to the pressure sensor and the circulation circuit. Is set at a connecting position, and the water level of the bathtub is detected from the output of the pressure sensor.

According to the above invention, the pressure sensor correction,
Instead of detecting the reference value for calibration in accordance with the reference water level of the bathtub, one outlet of a three-way valve provided between the pressure sensor and the circulation circuit or the pouring circuit is opened to the atmosphere,
The measurement is performed based on the water level when the pressure sensor connected to the other outlet is opened to the atmosphere. Therefore, the pressure sensor can be corrected and calibrated irrespective of the automatic operation of filling the bathtub. Accordingly, the time for the automatic hot water filling operation can be shortened accordingly.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. However, the technical scope of the present invention is not limited to the embodiment.

FIG. 1 is a diagram showing a configuration of a water heater according to an embodiment. It has a circulation circuit 20 connected to the hot water supply circuit 10 and the bathtub, and a pouring circuit 30 connecting them.
In the hot water supply circuit 10, a heat exchanger 11, a water amount sensor 15,
An incoming water temperature sensor 16, a hot water temperature sensor 17, a water flow switch 18, and a hot water supply port 19 are provided. When the tap of the hot water supply port 19 is opened, the water amount sensor 15 detects and detects the gas source electromagnetic valve 14.
Is opened, the opening of the proportional valve 13 is adjusted, and the capability of the burner 12 is controlled. As a result, feedforward and feedback control are performed so that the tapping temperature becomes the set temperature.

In the circulation circuit 20, a heat exchanger 21, a temperature sensor 22, a circulation pump 23 and a water flow switch 24 are provided. Reference numeral 25 denotes a burner, which is connected to a gas inlet of the original gas valve 14 via an electromagnetic valve 26. The detection of whether or not there is a water level above the circulation fitting 44 in the bathtub 43 is performed by the circulation pump 2
3 is driven, and whether or not the water flow switch 24 detects flowing water is performed. The reheating operation is performed by the circulation pump 2
3 drives the burner 25 and ignites the temperature sensor 2
2 is performed by burning until the temperature reaches the set temperature.

In the pouring circuit 30, a pouring solenoid valve S1 as a first solenoid valve, a check valve 31,
A second solenoid valve S2 is provided in series. Further, a pressure sensor 33 is provided in the pouring circuit 30 via a three-way valve 32. The above-mentioned actuators such as sensors and solenoid valves are controlled by a control unit 40 having a microcomputer.
Are connected by wiring (not shown).

FIG. 2 is a table showing the open / closed state or set positions of the solenoid valves S1 and S2 and the three-way valve 32 in the pouring circuit 30 of the water heater. According to this chart, the respective operations during pouring, when pouring is not performed after pouring (pouring stop), and when the pressure sensor is corrected will be described. The operations of the solenoid valve and the three-way valve are all performed by drive signals from the control unit 40.

[At the time of pouring] When an automatic filling command is issued from a remote controller (not shown), solenoid valves S1 and S in the pouring circuit are provided.
2 is opened, the hot water supply burner 12 burns, and the hot water is supplied from the hot water supply circuit 10 to the bathtub 43 via the pouring circuit 30 and the circulation circuit 20. In this automatic operation, since the control is performed without performing correction and calibration of the pressure sensor 33 based on the reference water level of the bathtub 43 as described later, the time required for the automatic operation is shorter than in the conventional example.

[When pouring is stopped] When pouring is completed, the pouring solenoid valve S1 as the first solenoid valve is closed, as shown in FIG. In addition, the second solenoid valve S2 is opened, and the three-way valve 32 is set at a position where the pressure sensor 33 and the pouring circuit 30 are connected, so that the pressure sensor 33 is connected to the bathtub through the circulation circuit 20. I do. As a result, when pouring is not performed, the pressure sensor 33 detects the water level in the bathtub.

[Pressure Sensor Correction] Correction or calibration corresponding to the aging of the pressure sensor 33 is performed as follows. As shown in FIG. 2, the first solenoid valve S1 and the second solenoid valve S2 are closed, and one of the three-way valves 32 is opened to the atmosphere. As a result, the pressure sensor 33 is
The state is opened to the atmosphere via. Therefore, the pressure sensor 3
Numeral 3 detects the atmospheric pressure, more precisely, the pressure corresponding to the water level in the three-way valve 32. The detection value of the pressure sensor 33 in this state is stored as a reference value in a non-volatile memory (not shown), and the reference value is periodically compared with the detection value. That value is corrected.

The above state can be reproduced simply by opening and closing the solenoid valve and rotating the three-way valve 32, so that it can be easily performed in a process different from the automatic operation. Therefore, it can be performed periodically, for example, at midnight when combustion is not performed.

At the time of this correction, since the second solenoid valve S2 is closed, water in the circulation circuit 20 does not leak. If the three-way valve 32 does not accidentally open the circulation circuit 20 to the atmosphere, it is not necessary to provide the second solenoid valve S2.

FIG. 3 is a schematic perspective view showing the relationship between the water heater and the bathtub according to the above embodiment. The configuration inside the water heater is the same as in FIG. FIG. 3 shows a water heater 100.
Is installed at a position higher than the bathtub 43. That is, in the pouring circuit 30 in the water heater 100, there is no hopper provided for separating the clean water on the hot water supply circuit side and the contaminated water on the circulation circuit side. Therefore, the installation location of the water heater 100 is
3 installed at a higher position than the pouring solenoid valve S1 and check valve 3
Even if 1 fails, the sewage in the bathtub is prevented from flowing back into the hot water supply circuit 10.

Therefore, when a hopper is provided between the solenoid valves S1 and S2 and closer to the hot water supply circuit than the pressure sensor 33, the bathtub 43 can be provided at a position higher than the water heater 100.

Further, in FIG. 3, the pressure sensor 33 and the three-way valve 32 are provided at the same height. Then, the three-way valve 32 is opened to the atmosphere with one of its outlets facing the horizontal direction. With such a height relationship, the pressure sensor 33 is applied with substantially the same pressure as the atmosphere, so that the reference value at the time of correction or calibration of the pressure sensor becomes more accurate.

In the above embodiment, the pressure sensor 3
Since the distance between the reference 3 and the reference water level of the hopper 32 is extremely short, the pressure value of the pressure sensor 33 with respect to the reference water level can be accurately detected. FIG. 9 is a diagram showing an example in which the water heater 1 is usually installed in a house. As shown in this figure, for example, 5 from the height at which the water heater 1 is attached.
The bathtub 43 between the high position and the low position
Is required to be installed. In that case, in the conventional method, the distance between the reference water level in the bathtub 43 and the pressure sensor 33 is extremely long as compared with the embodiment of the present invention. Therefore, it is difficult for the pressure sensor 33 to accurately detect such a difference of 1 to 2 cm at such a distant position. In this regard, in the above embodiment, since the position of the reference water level Pa is close to the same water heater, the pressure value of the reference water level can be accurately obtained.

[Automatic Filling (Pouring) Operation] As described above, in the water heater according to the embodiment of the present invention, it is not necessary to detect the reference value for correcting the pressure sensor 33 during the automatic operation. Therefore, the automatic operation can be performed in a shorter time than in the conventional example.

FIG. 5 is a reference diagram for explaining an example of the automatic hot water filling operation. FIG. 6 is a flowchart of an example of the automatic hot water filling operation. In this automatic operation, when it is first confirmed that there is no water in the circulation circuit 20, the water amount Z liter ((Ps−Pa) ×) from the reference water level Pa stored in the storage mode operation to the set water level Ps.
(S, S is the area of the bathtub) to check whether the water level has risen above the circulation fitting 44, and after confirming that the water level has risen above the circulation fitting 44, use the output value of the pressure sensor. Pouring to the set water level Ps. This pouring amount is obtained by calculation from the bathtub area S and the water level.

As shown in FIG. 6, when the automatic hot water filling operation switch is first turned on from the remote controller (S1).
0), and drives the circulation pump 23 in the circulation circuit 20 (S1).
1), it is detected whether or not the water switch 24 is turned on (S12). Then, when the flowing water switch 24 is turned on, it means that the water level in the bathtub is already higher than the circulation fitting 44, so that additional heating is performed to raise the temperature to the set temperature (S22). When the water switch 24 is off,
Although the water level is higher than the circulating metal fittings, the inside of the circulating circuit 20 may only be empty. Therefore, in Step S13, about 10 liters are poured and it is confirmed that the flowing water switch 24 is not turned on (S14, 15).

Then, after confirming that the flow water switch 24 is turned off, the above described Z liter is poured (S16). By pouring only Z liters, even if there is residual water below the circulating metal in the bathtub 43, pouring is never prevented above the set water level Ps.
Then, the circulation pump 23 is driven again to check whether or not the running water switch 24 is turned on.
Even if the position of the circulation fitting 44 is slightly moved up and down, the molten metal can be reliably poured to an arbitrary water level between the set water level Ps and the circulation fitting 44 (S17, 18).

Then, after the circulation pump is stopped, the output of the pressure sensor 33 is detected, and based on the relative relationship with the output value of the pressure sensor at the reference water level of the bathtub, the current bathtub water level P1 is detected.
Is detected (S19). Then, the required pouring amount to the set water level is calculated and pouring is performed (S21). When pouring is performed to the set water level (S20), reheating is performed to the set temperature (S23), and when the pouring is completed, a buzzer for terminating the filling is sounded (S24).

As described above, at the time of automatic operation of hot water filling,
It is not necessary to perform a step of setting the water level of the bathtub to the reference water level Pa as in the conventional case. Therefore, it is simply checked whether or not the circulation circuit 20 is empty, and if it is empty, replenishment of Z liters is repeated to fill the circulation circuit 20 with water. Since only hot water is required, the time required for automatic operation can be significantly reduced.

[0037]

As described above, according to the present invention, the detection of the reference output for correcting or calibrating the pressure sensor can be performed by using the pressure sensor through the three-way valve without using the reference water level of the bathtub. Since the pressure is made open to the atmosphere and the pressure at that time is used as a reference, correction or calibration of the pressure sensor can be easily performed. Therefore, the time required for the automatic filling operation can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a water heater according to an embodiment.

FIG. 2 is a table showing open / closed states or set positions of solenoid valves S1 and S2 and a three-way valve 32 in a pouring circuit 30 of the water heater of the embodiment.

FIG. 3 is a schematic perspective view showing a relationship between a water heater and a bathtub according to the embodiment.

FIG. 4 is a reference diagram for explaining an example of an automatic filling operation.

FIG. 5 is a flowchart of an example of an automatic hot water filling operation.

FIG. 6 is a flowchart of a conventional automatic hot water filling operation.

FIG. 7 is a reference diagram showing a water level in a bathtub 43 in a storage mode.

FIG. 8 is a reference diagram showing a water level in a bathtub 43 during a conventional automatic hot water filling operation.

FIG. 9 is a diagram showing a relationship between a bathtub and a pressure sensor when a water heater is installed in a house.

[Explanation of symbols]

 Reference Signs List 10 hot water supply circuit 20 circulation circuit 30 pouring circuit S1, S2 first and second valves 32 three-way valve 33 pressure sensor 40 control unit

Claims (4)

[Claims] 1. A composite water heater comprising a hot water supply circuit for heating hot water to supply hot water, a circulation circuit for circulating and heating water in a bathtub, and a pouring circuit for connecting the hot water supply circuit and the circulation circuit. In the pouring circuit, a first valve opened at the time of pouring sequentially from the hot water supply circuit side, a second valve is provided in series, between the first valve and the second valve A pressure sensor is provided via a three-way valve, the first and second valves are opened when pouring into the bath, and the first and second valves are closed when the pressure sensor is corrected. And a controller for setting the pressure at a position where the pressure sensor is connected to the atmosphere and detecting an output of the pressure sensor. 2. The combined water heater according to claim 1, wherein the control unit further closes the first valve and opens the second valve when the pouring is not performed. A valve is set at a position where the pressure sensor and the circulation circuit are connected to each other, and a water level of the bathtub is detected from an output of the pressure sensor. 3. A combined water heater having a hot water supply circuit for heating and supplying hot water, a circulation circuit for circulating and heating water in the bathtub, and a pouring circuit for connecting the hot water supply circuit and the circulation circuit. In the pouring circuit, a first valve that is opened at the time of pouring is provided in the pouring circuit, and a pressure sensor is provided via a three-way valve in the pouring circuit or the circulation circuit. And a control unit for detecting the output of the pressure sensor by setting the three-way valve to a position connecting the pressure sensor and the atmosphere when correcting the pressure sensor. vessel. 4. The combined water heater according to claim 3, wherein the control unit further connects the three-way valve to the pouring circuit or the circulation circuit and the pressure sensor when the pouring is not performed. And the water level of the bathtub is detected from the output of the pressure sensor.