JPS63315855A - Method of controlling hot water surface and hot water temperature in bath of metallic container - Google Patents

Abstract

PURPOSE:To enable a hot water level and a hot water temperature to be controlled with a convenient process by a method wherein some detectors are fixed to a wall of a bath tub. CONSTITUTION:A target hot water level detector 1-5 is installed at an outer wall of a bath tub 20 of metallic container and a hot water level detector 1-6 just above a boiling port 22 of a burner part 21 is provided with an electromagnetic coil type water surface level detector. A hot water level measurement is performed such that an oscillator 3' is connected to one coil and an amplifier 4' is connected while the other coil is being applied as a receiving coil. When a low frequency is applied in the oscillator 3', a magnetic flux phi passes through a wall of a bath tub and then is connected to a receiving coil. The hot water surface level detectors 1-5 and 1-6 are set in such a way as they may show a resonance condition when the hot water level reaches the detectors so as to detect a presence or non-presence of the hot water surface. Then, a measurement of the hot water within the bath tub is performed such that some temperature detectors 1-1-1-4, for example, a thermocouple of thermistor are connected in series to an outer wall of the bath tub. With this arrangement, it is possible to make an easy measurement of mean hot water temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for detecting the scene level and water temperature of a bath (bathtub and burner portion) and a management system that is extremely effective for safety management of the bath.

[Conventional technology] Conventionally, level measurement of tanks, etc. has been mainly performed using floats, but capacitance level gauges using bridge circuits have also been put into practical use (Mitsuru Terao; Modern Electrical Engineering Course Industrial Measurement 203)
~204 pages, 84B, 6. Ohmsha).

However, in the management system for baths in homes, etc., ON-OFF control using a method that combines a valve 71 and a level meter that detects the hot water level L by floating a float 70 in the bathtub 20 is practical, as shown in Fig. 7. has been made into Furthermore, the reality is that no system has been proposed that detects the temperature of water in a bathtub and estimates the target temperature.

[Problem to be solved by the invention The float type level meter used in baths etc. is directly connected to the water valve, so it is impossible to reach 0N-of at the target level.
I can only judge f. It also gets in the way while bathing, so
Since it is removed, it is not possible to know the water level after taking a bath. Therefore, if the water level drops or if a child accidentally removes the bath frame, there is a possibility that the bath will be heated dry.

The present invention uses a level meter as a bathtub made of a metal container (hereinafter referred to as a bathtub).
The present invention provides a detection device that continuously measures water surface level and hot water temperature by attaching it to the outer wall or inner corner of a water heater, and a scene level management system using the detection device.

[Means for solving the problem] It is difficult to determine whether water is boiling over in a gas bath or the like. In a gas bath, heated water is discharged from the spout and rises to the surface of the water. Therefore, the temperature inside the bathtub is high at the top and low at the bottom. Normally, stirring is done to eliminate temperature distribution on the surface of the hot water, and the temperature is determined intuitively by hand.

The present invention provides one or more temperature detectors on the outer wall of a bathtub or a corner inside the bathtub, and accurately estimates the average temperature of the water from the measured temperature values in combination with a water level meter.

The present invention will be explained in detail below with reference to the drawings.

Figure 1 shows a measurement system for realizing the present invention, Figure 2 shows a cross-sectional view of the bath and the mounting positions of the hot water temperature detector and the hot water level detector, and Figure 3 shows the hot water level. An example of a detector circuit that uses an electromagnetic coil to detect the level is shown in Figures 4 and 5, and an example of a temperature detection circuit that uses a thermocouple, thermistor, resistor, etc. to measure the temperature of hot water. It is.

A case where the bathtub is made of metal, such as stainless steel or cast metal, will be explained.

The hot water level is measured using an electromagnetic coil. The basic method is shown in Figure 3(a), and an example of the measurement circuit is shown in Figure 3(a).
Shown in b).

This method is attached to the side of the bathtub 20. The electromagnetic coil method consists of two coils, with an oscillator 3' connected to one coil and an amplifier 4 connected to the other coil as a receiving coil.
Connect ′.

Stainless steel is non-magnetic, and cast metal has low magnetic permeability, so if the frequency of the oscillator 3' connected to the coil is low (several kllz or less, for example around 50011z), the magnetic flux φ will be as low as the bathtub. Figure 3 (
Combine with the receiving coil as shown in a). The voltage V generated in the receiving coil is V=dφ/dt.

When there is no water in the bathtub, there is only the receiving coil, and when there is water, coupling with capacitance C occurs, forming a parallel circuit between the receiving coil and C, resulting in the configuration shown in Figure 3 (b). .

The scene level is hot water level detector 1-5. When the temperature reaches 1-6, the detector is set to resonate and detects the presence or absence of the hot water level.

Next, the principle of measuring the temperature of hot water in a bathtub (hereinafter referred to as hot water temperature) will be explained. Note that the more temperature measurement points there are, the better the accuracy, but here we will explain a method of detecting the temperature of hot water by measuring the temperature at four points.

As shown in Figure 2 (a)' and (b), 1-1 to 1-4
Attach a temperature sensor, such as a thermocouple or thermistor, in series to the outside wall of the bathtub. A thermocouple generates an electromotive force that depends on temperature, and a thermistor changes its resistance value.

FIG. 4 shows a basic circuit for determining voltage changes caused by a thermocouple, and FIG. 5 shows a basic circuit for reading resistance changes of a thermistor.

In the present invention, the average temperature can be easily determined by connecting temperature detectors in series.

For example, the electromotive force V generated by a thermocouple is ■=α('r-'ro)...
...(1) α: Seebeck coefficient T: Measured temperature To22 humidity temperature cold junction) Temperature T1. T2. T3. The electromotive force of T4 is Vl.

Let V2, Vs, Va. Since the cold junction is common, the output voltage V connected in series is v = v1 + V2 + v3 + v4 = α (T1 + T2 + T3
+T4-4To)=Σ α(T To) ・・・・・・・・・・・・
(2) Since the temperature characteristic of the n-1n thermistor is B: constant number of thermistors, similarly R becomes S (3).

In addition, since a general resistance temperature sensor has R=Ro (1+γT), R1-Σ Ro(1+γTn)... (4) Low 1 γ: Temperature coefficient composite value of each detector V, R8, No problem occurs even if Rt is used as is and applied to the estimated temperature value. That is, suppose that the composite value is amplified by an amplifier to obtain Vt.

If the set voltage of target temperature T is V, then VtS If it becomes 4v with respect to V, it matches the target value and S That means that.

Furthermore, by providing the signal processing device 7, Vt/4 can be easily determined. That is, R=4R2,v,n=
Therefore, the present invention can provide an inexpensive measuring device with high measurement accuracy using a simple measuring circuit.

By combining the scene detector and temperature detector described above, a management system for a bath in a home or the like can be realized.

This will be explained in detail below using FIG.

This system receives the signals from the temperature and scene level detector 1,
The temperature is processed by a signal amplifier 2. The signal processing device 7 (for example, an electronic computer) is a device having a function of storing processing contents in advance and processing the contents.

Since the signal processing device 7 stores the contents to be processed in equations (1) to (6) mentioned above, it is read from the signal amplifier 2 and calculates Vt and the target set by the setting device 8. It is constantly judged from the set voltage V of the temperature T whether the water temperature S has reached the target value, and when the target temperature is reached, the buzzer 10 is activated through the output device 9.
The content of the alarm is notified by displaying the lamp 11.

Furthermore, when automatically opening and closing the water valve and gas valve, this can be achieved by sending signals (WCV, GCV) to the solenoid valves 23 and 24.

Next, the scene level is processed by a signal amplifier shown in FIG. 3, consisting of a current amplifier 4', an AC/DC converter 5', and an AC oscillator 3'. The signal VΩ from the signal amplifier is input to the comparator 12-1, 12-2 in FIG.

The signal Vn from the signal amplifier is set to the lower limit level LN.

Set the target level to L. First, before filling the bathtub with water, the scene level detection system is activated. Then begin pouring into the bathtub. Water level signal, 12. LS is comparator 1
2-1.12-2, setter 17-1.17-
2, the result is sent to the OR circuit 13-1.
13-2 combines the analog circuit and the digital circuit, inverter 5-1, 15-2 and AND circuit 14-1
．． Signal processing with 14-2, 5W116-1 and 5W21
6-2 is activated.

That is, when water injection starts and the scene reaches the target level, the target level alarm buzzer is activated.

When the alarm buzzer is activated, reset the reset 5W17-1 and close the water valve at the same time.

Next, when the hot water level falls below the lower limit level, that is, just above the boiling point of the burner part, during use, the lower limit level alarm bell is activated, so the alarm buzzer is reset and water is immediately poured to prevent dry heating. Of course, solenoid valve 23.2
By sending a signal to 4, it is also possible to automatically open and close the water valve and gas valve.

The signal coming out of the comparator and SWl.

FIG. 6 illustrates the operating status of SW2.

That is, when Ln and LS are in the H state, the target level alarm S
W, 16-1 is activated. Alarm reset 5W17-1
It is canceled by Also, when LΩ and L8 are both L,
Since the reset 5W17-1 is in the ON state, the lower limit level alarm 5W21B-2 is activated.

As explained above, the present invention makes it possible to control the water surface level and water temperature in a simple manner by attaching a detector to the wall of the bathtub.

[Effects of the Invention] The present invention makes it possible to safely and easily control the water level and temperature of the bath from the outer wall of the bathtub, eliminating the narrow space in the bathtub that was a disadvantage of internal bathtubs. Or, it is now possible to prevent the possibility of empty heating due to removal during bathing.

[Brief explanation of drawings]

Fig. 1 is a detailed explanatory diagram of the present invention, Fig. 2 (a) is a sectional view of the bath, Fig. 2 (b) is an illustration of the mounting position of the hot water temperature detector and the hot water level detector, and Fig. 3 Figure (a) is an explanatory diagram of a detector using an electromagnetic coil to detect the hot water level, (b) is the same circuit diagram, and Figure 4.5 is a thermocouple and sensor for measuring the temperature of hot water. A temperature detection circuit diagram using a mister resistor, FIG. 6 is an explanatory diagram showing the relationship between a hot water level detection signal and an alarm signal, and FIG. 7 is an explanatory diagram of a conventional example. 1: Temperature, scene level detector 9: Output device 12: Comparator 13: O
R circuit 14: AND circuit 15: Inverter 20: Bathtub attorney Tatsuo Chanoki (Fig. 2r) Fig. 3 I Fig. 3 (b) Fig. 4

Claims (1)

[Claims] Electromagnetic coil type water level detectors are installed on the outer wall of the metal container bathtub at two locations directly above the target hot water level and the boiling point of the burner section. A method for controlling the water level and water temperature of a bath made of a metal container, characterized in that temperature detection ends above a point are installed in series below a target water surface level, and the average water temperature in the bathtub is determined.