JPS5849250B2 - automatic boiling pot - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic simmering pot that has a function of detecting and notifying the heating state of food by detecting the temperature of steam generated from the food being heated in the simmering pot.

Traditionally, cooking using a pot involves placing food in a pot, heating it with a heat source such as a gas or electric stove, and then removing the lid at any time after an appropriate amount of time to check the heating status of the food in the pot. The method used is to increase the heating time.

When using such a heating cooking method, the finished state of the food depends on cooking experience and skill level.

Furthermore, in order to check the doneness of the food being heated, it is necessary for the concubines to remove the lid and examine it, which is often inconvenient as they are tied up next to the pot while the food is being heated.

In order to eliminate this inconvenience, it is possible to set a timer at the start of cooking, but it is also recommended to set an appropriate heating time on the timer, taking into consideration factors such as the amount of food, the finished state, the amount of heat from the heat source, etc. It's not easy to do.

The present invention relates to a pot for boiling food that has a built-in electronic circuit that has the function of automatically setting a timer and notifying you after a certain period of time has passed after detecting a temperature change in water vapor that occurs when food is boiled.

According to the present invention, the temperature of the exhaust steam when boiling food is constant regardless of the amount of food, the initial temperature, or the amount of heat of the heating source.

Therefore, if you start the timer after detecting the temperature at the point of boiling, the finished state of the food after the time set on the timer has elapsed will be affected by the amount of food, the initial temperature, and the amount of heat from the heating source. It will end up in a certain state without any problems.

FIG. 1 shows the structure of a conventional boiling pot.

1 is a lid, 2 is a pot container, and 3 is a handle.

FIG. 2 shows a heating situation using a pot constructed in accordance with the principles of the present invention.

In FIGS. 1 and 2, a steam outlet such as 7l is made at the joint 7 between the container 2 and the handle 3.

When food 4 is placed in a container 3 and heated by a heat source 5, the steam pressure in the container increases rapidly when the food 4 boils, and high-temperature water vapor is vigorously discharged from the outlet T.

This state is shown in FIG.

In FIG. 3, T is the warm fit of the steam 6, and t is the heating time.

The temperature near t1 is near the boiling point of the food, and the temperature of the water vapor 6 at that time is t1 (° C.).

In the above state, if a temperature-sensitive sensor is installed near the outlet T as shown in FIG. 4, the temperature of the water vapor 6 can be detected.

FIG. 5 shows an example of the temperature characteristics of a temperature-dependent resistor used as a temperature sensor.

T is ambient temperature, R/R25 is ambient temperature 1i25[:'C,
The resistance ratio to the resistance value when l is shown.

FIG. 6 shows an embodiment of the control circuit.

In FIG. 6, a resistor 9 is connected in series with a temperature-dependent resistor 8 having the characteristics shown in FIG.

10 is a binary logic element, the switching value of which is determined by the supply voltage E.

When Ea exceeds the threshold, the output level of element 10 is inverted.

An IC is an integrated circuit for a long time timer, and a typical example is: ．．
The specifications of XR-2 2 4 2 (EXAR Co., Ltd.) are the first
An example of its configuration and a recommended example of a connection diagram are shown in FIG.

Resistor 11 connected to terminals 2, 3, 5, 7, and 8 of the IC
, 12, 13, and 14 are based on FIG.

The product of the resistance value R of the variable resistor 20 and the capacitance value C of the capacitor 22 determines the set time of the timer.

Terminal 6 is the trigger terminal of the timer, and Eb is I+1
Triggered at ++ level.

(Refer to Figure 8) Terminal 3 is the output signal terminal of the timer, and is always at the el 1 11 level. When the timer is triggered, it becomes the '0 97 level. When the set time determined by CR-F has elapsed, the terminal 3 becomes the f+ 1 level. Return to level 11.

17 is a two-manufactured NAND gate element, which outputs a negative signal of the logical product of input signals.

18 is a transistor that drives a buzzer B as a notification means.

15 is a base current limiting resistor of the transistor 18;
16 is a resistor for stabilizing the switching operation.

19 is a power switch, and E is a DC power supply.

The logic element 10 is a CMOS (complementary me) whose value is determined depending on the DC power supply voltage E.
talOxide Semiconductor)
The configuration is appropriate.

FIG. 7 is an operation timing chart of the control circuit shown in FIG. 6.

FIG. 7 will be explained with reference to FIG.

In FIG. 7, Ta is the warmth of the water vapor 6 discharged from the outlet T in FIG. 2, and is detected by a sensor 8 having characteristics as shown in FIG.

t indicates heating time.

Ea, EbtEct and Ed indicate voltage changes at each point shown in FIG.

When the food in the pot is heated, the temperature Ta of the discharged steam is 7
It changes like a.

After around time t1, the food becomes boiling.

As shown in FIG. 5, the temperature sensor 8 changes its resistance in a switching manner after 75° C. (approximately 11), so if the resistor 9 is appropriately selected, Ea changes as shown in 7b.

Corresponding to the change in Ea, the output voltage Eb of the logic element 10 changes as shown in 7c.

Here, Eth is the value of the logic element 10.

Since Eb is a trigger signal for the timer IC, the timer is triggered when it reaches the "191 level" at t1.

Ec is the change in the output signal of the timer IC from t1 to t2
The time TD becomes the set time.

After TD has elapsed, the output state returns to the "1" level at t2.

(7d) Ed is a negation signal of the logical product of the timer output signal Ec and the trigger signal Eb, and its state changes to 'O l+ level at t2.

That is, at t2, the transistor 18 becomes conductive, so that the buzzer B is energized to issue a notification.

Since the circuit shown in FIG. 6 can be constructed compactly with a small number of parts and integrated circuits, it can be implemented entirely within the pot handle 3 as shown in FIG. 9.

In FIG. 9, 19 is a power switch, and 21 is a high temperature steam discharge section.

2σ is a knob of the variable resistor 20 shown in FIG. 6, and since the resistance value can be adjusted from the outside, the timer time can be set freely.

Furthermore, it is also possible to easily prepare several types of fixed resistors instead of variable resistors, and to enable selection and setting of these resistors using a changeover switch.

By using a pot based on the above principles and configuration, (1) it can be used regardless of the type of heating source (gas, electricity, etc.);

(2) Since it can be integrated with the handle of a conventional pot, handling is no different from that of a conventional pot.

(3) Since automatic notification is provided, there is no need to constantly pay attention to the status of the pot during heating.

(4) After the temperature of the steam exceeds a certain value, the timer circuit allows you to set an arbitrary heating time and notify the completion of heating, so that the item to be heated can be heated once, such as when cooking in a pot for a long time. This is particularly effective for dishes that need to be heated continuously after they have been boiled, making it possible to realize an automatic notification pot for a wide range of uses.

[Brief explanation of drawings]

FIG. 1 is a side view of a conventional boiling pot, FIG. 2 is a structural diagram of an automatic boiling pot showing an embodiment of the present invention, and FIG. 3 is a diagram showing temperature variation of heated steam. 4 is a diagram explaining the principle of the present invention, FIG. 5 is a characteristic diagram of a temperature sensor, FIG. 6 is a specific circuit diagram of the present invention, and FIG. 7 is an operation timing chart of the same circuit. The figure is a schematic diagram of a timer IC used in the automatic simmering pot of the present invention, and FIG. 9 is an external view of the automatic simmering pot according to the present invention. 1...Lid, 2...Pot container, 3...
...Handle, 5...Heat source, 6...Water vapor, 7...Joining part, γ...Exhaust port,
8... Warm concubine dependent resistance.

Claims (1)

[Claims] 1. A water vapor discharge section, a sensor means for detecting the temperature of this water vapor and converting it into an electrical signal, and a value of this electrical signal,
The device is equipped with a circuit for comparing a reference signal value set in advance, a timer circuit driven by the output signal of the comparison circuit, and a notification means driven by the output signal of the timer circuit. . The automatic boiling pot, wherein the timer circuit is driven from the time when the reference signal value is reached, and when the time set in the timer circuit has elapsed, the notification means is activated.