JPS5888619A - Annunciating device for amount of water in heat insulating pot - Google Patents

Abstract

PURPOSE:To detect the amount of water through simple constitution by comparing the power feeding time of a heater with the time of a timer wherein prescribed time is set. CONSTITUTION:This describes a decrease in the amount of water below a prescribed value. If feeding to a heater 3 is completed in the time of a timer determined by an oscillating circuit 5 and counter circuit 6 for the timer, the transistor 40 of a feed detecting circuit 8 in operation turns off. On the other hand, the Q' output of the flip-flop circuit 28 of the counter 6 is at a level H during timer counting operation and an annunciating and oscillating circuit 7 starts oscillating. Once said circuit 7 oscillates, a decrease in the amount of water is annunciated through a speaker 12. When the amount of water further decreases, the heating time of the heater 3 is further shortened and the annunciation time is extended.

Description

[Detailed Description of the Invention] The present invention is based on the on/off single grade control Ji41, which is used to energize and stop the heater. This system is intended to notify the user when the amount of water decomposed becomes less than a predetermined value at 70 o'clock without using a sensor or the like.

In general, a thermos pot that keeps warm by turning on and off will cause a constant amount of water to evaporate during heating due to heating and stopping. 1 (will gradually decrease) 16. At the end of the song, there is a risk of rL empty cooking [Ill].

Ushita, to the aforementioned warming bot"-3・te:r'x(J
l: Also, 1: The white X'I type is watered using a pump, etc., and the drawback is that it is difficult to check the remaining liquid in water). -I am. In this 2-type heat insulating bottle, a peephole was installed in the Vl, 11111, and a peephole was installed so that the water level could be checked. Therefore, it is inconvenient for the user to check the water level when using the water.
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i (invention & J, point e (kanka i) of 1-) ~ na l\J1
/(-thing, [stupid? 7+a bot water (j;・Detection 4
: 1 pile of heat 'd + : IL' + When the amount of water decreases, energization, time power sliding door] will be published.
17, it is intended to inform the user of the VC. .

The turning V(1) is described in detail below with reference to the gun A.1 drawing. Figure 1 i/(X:l
', 1 i1'J'<for i', 1i source, 2t1 bimetal thermostat ('S, IJl Re-Mostanoto and 111 luck), 3 & Ronita, 4Q1, timer recess circuit, 5 is oscillation circuit for timer, 6 is a counter circuit,
7 is a notification oscillation circuit, and 8 is an energization detection circuit.

9.13.36 is a rectifier diode, lo, 14°15.
17, 19, 20, 23, 24, 29, 32° 33.3
4, 38, 39 are resistors, 11 and 37 are smoothing capacitors, 12 is a notification speaker, 16 is a differential capacitor,
18, 35.40 are transistors, 21.30 are oscillation capacitors, 22 and 31 are programmable unijunction transistors (abbreviated as PUT), 25, 26
．． 27 and 28 are flip-flop circuits.

The operation in the above configuration will be explained. First, the characteristic graph of the heating time (the energization time of the heater 3 in the figure) and the amount of water shown in FIG. 2 will be explained. As is clear from Figure 2, in a device that heats with constant gravity, if the amount of water decreases,
Heating time will be shorter.

This characteristic has a certain correlation between the amount of water and the heating time as shown in the figure. Here, if you set the amount of water to be detected, the energization time of Heat 3 will be determined automatically (
Time T in the figure).

Next, the operation will be explained using FIGS. 3a and 3s. First, we will explain n)a about the condition where the amount of water is more than a predetermined value. Commercial power supply 1d: rectified by a rectifier diode 9, stepped down by a resistor 10, and normalized by a capacitor 11, giving a DC voltage to the circuit. Here, when the thermostat 2 that performs on-off vorticity control is turned on, the heater 3 is energized and starts heating. When the heater 3 is energized, the timer celler i.
Rectifier diode 13 of circuit 4, resistor 14, 7j 3-minute capacitor 16° Charge voltage of capacitor +7 to 16 for differentiation via the base-emitter of transistor 18 m, power cap e
hz I□ transistor 18 turns on instantaneously. When the transistor 18 turns on instantaneously, the flip-flop circuits 25 to 28 of the counter circuit 6 all turn on at 71. First jV
Becomes a + state. When the counter circuit 6 is reset, the Q Kawauchi *IL1 child of the final stage 7 reset circuit 28 becomes H.
level, and the timer oscillation circuit 5 iJ: starts oscillation (the timer oscillation circuit is a relaxation oscillation circuit using PUT, which has already been described in 9..11, and its operation will be omitted).

At this point, the instantaneous turning on of the transistor 18 described above is completed,
When turned off, the counter circuit 6 starts counting the output pulses of the timer oscillation circuit 6. On the other hand, when the heater 3 is energized, the transistor 40 of the energization detection circuit 8 is connected to the rectifier diode 36. Since current flows through the base-emitter of the resistor 38° transistor 40, it turns on and short-circuits the oscillation capacitor 30 of the notification oscillation circuit 7. If the oscillation capacitor 30 is short-circuited, the notification oscillation circuit 7 will not operate and the speaker 12 will not operate even if the Q output of the 7-lip 70-tub circuit 28 of the counter circuit 6 is at H level.

This point is the timer start point in FIG. 3a. and,
When the counter circuit 6 finishes counting, the Q output of the 7 lip 70 tube circuit 28 goes from H level to L level, the timer oscillation circuit 5 stops oscillating, the counter circuit 6 stops operating, and at the same time the notification oscillation circuit ends. (at the end of the timer in FIG. 3d). Even if the heater 3 is de-energized and the transistor 40 of the de-energization detection circuit 8 is de-energized after the timer ends, the Q output of the flip-flop circuit 28 remains at the L level, so the notification oscillation circuit EIJ, It doesn't work and the speaker 12 doesn't work either. Then, when the water temperature falls and the heater 3 is energized again, the above-mentioned operation is repeated.

Next, the case where the amount of water becomes less than a predetermined value will be explained. The operation of resetting the counter circuit 6 and starting the timer is the same as in the case where the amount of water is greater than the predetermined value described above (timer start point b in FIG. 3). When the energization of the heater 3 ends during the timer time (T in FIG. 3) determined by the timer oscillation circuit 6 and the counter circuit 6, the transistor 4o of the energization detection circuit 8, which was currently turned on, turns off. It turns off because there is no base current. On the other hand, 7 of the counter circuit 6
As described above, the Q output of the lip 70 tube circuit 28 is at the H level during timer counting, and the notification oscillation circuit 7 starts oscillating. The structure of the notification oscillation circuit 7 is also a well-known PUTK relaxation oscillation circuit, and its operation will be omitted. When the notification oscillation circuit 7 oscillates, the speaker 12 notifies you that the amount of water has decreased. Then, when the timer time T ends, the Q output i of the Norinob flop circuit 28
It becomes L level and the notification from the speaker 12 ends. Then, when the water temperature drops and the heater 3 is energized again, the above-described operation is repeated. Here, if the amount of water further decreases, the heating time T of the heater 3 will further become shorter, and the notification time will become longer.

As described above, according to the water level notification device of the present invention, the configuration is simple by comparing the energization time of the heater with an internal predetermined timer without using a special sensor such as a float switch to detect the water level. Furthermore, when the amount of water decreases below a predetermined value, the notification time increases in proportion to the amount of water decrease, which is effective in notifying the user. In the above embodiment, a speaker was used as the notification means, but it is of course possible to use a blinking light emitting element, for example. In addition, although the heater energization time was compared with a timer in the embodiment, the same effect can be obtained by comparing the heater stop (non-energization) time.

[Brief explanation of drawings]

Electrical circuit diagram, Fig. 2k, lt of water sprinkling and heating time to explain the operating principle of 1 piece i'υM], -Drawing, Fig. 3a
, b are reliable waveform diagrams of the essential parts of the electric circuit, and FIG. 3a shows the case where the amount of water is larger than the predetermined value, and FIG. 3 shows the case where the amount of water is less than the predetermined value. 3... Heater, 4... Timer reset circuit,
5...Timer oscillation circuit, 6...Counter circuit, 7...Notification oscillation circuit, 8...Electrification detection circuit.

Claims (1)

[Claims] The series circuit of the heater and the bimetal thermostat contact connected to the power supply, the timer circuit connected to the terminal of the heater 110 and activated when the heater starts or starts, and the output of this circuit connected to /ζ The alarm circuit and the heater terminal (/(connected energization detection circuit and the output of this energization detection circuit are connected to the above-mentioned This is a water flow alarm device for a water control pot that notifies you when the water volume is shorter than the set time.