JPH0212482Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention mainly relates to a cooking device in which a temperature control function is incorporated into a table stove.

(b) Conventional technology For example, a gas stove is equipped with a sensor that detects the temperature of an object to be heated, such as a cooking pot, and when the temperature of the object to be heated reaches a set temperature, an alarm is issued or a burner is controlled. As shown in Japanese Patent Application Laid-open No. 54-161468, this stove stops heating when the temperature of the heated object reaches the set temperature, and there is no function to continuously control heating to the set temperature. . On the other hand, if a device that issues an alarm when the temperature of the object to be heated reaches a set temperature is combined with a so-called temperature control function that controls heating to the set temperature, an alarm will be issued each time the set temperature is reached, which is not very desirable.

(c) Problems to be solved by the invention This invention controls the heating of the object to be heated to a set temperature, and when the set temperature is reached, a sounding element is used to notify the user. purpose.

(d) Means for solving the problem The present invention connects the output of a comparator that compares the temperature of the object to be heated with the set temperature to the set input of the R-S flip-flop, and connects one output of the flip-flop to the other. The output of a comparator is connected to a timer connected to the comparison input of this comparator, and the sound generating means is connected to the output of another comparator.

(E) Function When the heated object reaches the set temperature, the output of the comparator is reversed to operate the timer, and the output of the other comparator is reversed to drive the sounding means, and when the timer ends, the output of the other comparator is activated. The output of the flip-flop is inverted to stop driving the sound generating means, and one output of the flip-flop is locked to invalidate the set input.

(F) Embodiment An embodiment of the present invention is first constructed based on FIG. 1. 1 is a burner for a stove, which has a ring-shaped burner head 2, and a pot 4 etc. is placed in a ventilation hole 3 provided in the center thereof. A temperature sensor 5 for detecting the temperature of the object to be heated is disposed, and a pair of thermoelectric cells are arranged opposite to the flame hole part 6 provided on the outer periphery to generate an electromotive force when heated by the combustion flame formed in the part. Pairs 7 and 8 are arranged.

Reference numeral 9 denotes a gas flow path for supplying gas to the nozzle 10 provided in the burner 1, and one of the thermocouples 7 is connected upstream.
The main body 15 houses a solenoid valve 12 which is connected in series through a first relay contact piece 11', and a closure 14 which is located downstream of the solenoid valve and opens and closes by rotating the operating knob 13. At the same time, a temperature control solenoid valve 1 is located downstream of the main body and has a suction coil 17 arranged around the suction coil 16.
8 is interposed.

The adsorption coil 16 of the temperature control solenoid valve 18 is connected in series to the other thermocouple 8 via the second relay contact piece 19', and is connected in parallel to the valve hole 21 which is opened and closed by the valve body 20. A bypass 22 is provided through which weak combustion gas passes.

23 is a control circuit that receives the signal from the temperature sensor 5 and controls the first and second relay contacts 11', 19', etc., and as explained based on FIG.
The + side is grounded with a battery power supply of around 6V, and the power switch 2 is linked to the operation knob 13 above.
5 and the normally open contact 25' of this switch.
via the first and second relay contact pieces 11', 1
First and second latching type latching relays 11 and 19, each driving a latching type latching relay 9', are connected.

26 is a forced adsorption circuit for so-called instantaneous adsorption connected to the electromagnetic coil 12' of the electromagnetic valve 12, which controls a semiconductor switching element 27 connected in series to the electromagnetic coil 12', and this switching element.
It consists of a FET 28, a capacitor 29 connected to the gate of this FET, and the normally closed contact 25'' of the power switch 25. The FET 28 is set to a predetermined value by the charged charge of the switching capacitor 29 to the normally closed contact 25'' of the power switch 25'. The switching element 27 is turned on after being turned off for a period of time.

30 is a temperature adjustment circuit, and the output of the temperature sensor 5 consisting of a thermistor is connected to the temperature setting volume 3.
IC ₁ 33 consists of a first comparator 32 for comparison with 1, and a monostable multivibrator that outputs a high output for a predetermined period of time in response to the up pulse of this comparator.
IC ₂ 34, which is the same as IC ₁ that outputs high for a predetermined period of time in response to the down pulse of the first comparator 32;
A first drive transistor 36 drives a transistor 35 for driving the opening side coil 19'' of the second latching relay 19 with the output of the IC _{1 33} ;
The output of 4 drives the transistor 38 for driving the closing side coil 19 of the second latching relay 19 via the diode 37, and the transistor 40 for driving the attraction coil 17 via the diode 39.
When the temperature of the object to be heated reaches the temperature set by the regulator 31, the output of the first comparator 32 is inverted to high, and this rising pulse drives the first drive transistor 36 to a predetermined value. is turned on for an instant of time to energize the open coil 19'', open the second relay contact 19', and close the valve body 20 of the temperature control solenoid valve 18. As a result, gas is supplied to the burner 1 through the bypass 20. There is weak combustion, and when the temperature of the heated object falls below the set temperature due to this weak combustion, the output of the first comparator 32 is reversed to low, and this falling pulse turns on the second drive transistor 41 for a predetermined moment. At the same time as the closing side coil 19 is energized, the attraction coil 1
7 is energized, the valve body 20 of the temperature control solenoid valve 18 is opened, and the burner 1 is intensely burned.

42 is a notification circuit, and the first comparator 32
A second comparator 44 that compares the output of the second comparator with a reference voltage using resistors 43, 43, 43, a timer 47 consisting of a resistor 45 and a capacitor 46 that operate at the high output of this second comparator, and a timer 47 that is driven by the output of this timer. an R-S flip-flop 50 with the output of this transistor connected to the set input 49, an output 51 connected to one output 52 of the flip-flop 50, and a comparison input 53 also connected to the one output 52. A CR timer 56 consisting of a resistor 54 and a capacitor 55 is connected, and this output is connected to resistors 57 and 57.
A third comparator 58 for comparing with a reference voltage according to
and a sounding means 61 connected to the output 51 of the comparator and comprising a piezoelectric buzzer 59 and its oscillation circuit 60.

The operation of the notification circuit 42 will be explained as follows.
When the temperature of the object to be heated such as the pot 4 reaches the temperature set by the regulator 31 and the output of the first comparator 32 is reversed to high, the output of the second comparator 44 is also set to be reversed to high, and at this high output. When capacitor 46 begins to charge, the charging time transistor 48 turns on and causes the set input 49 of flip-flop 50 to go high, causing one output 52 of flip-flop 50 to go high and begin charging capacitor 55, which stops the charging. time 3rd
The output 51 of the comparator 58 is inverted to low to cause the oscillation circuit 60 to oscillate, thereby driving the piezoelectric buzzer 59. When the capacitor 55 is charged, the output 51 of the third comparator 58 is inverted to high, and the oscillation circuit 60 stops oscillating, and the capacitor 55
5 is fixed at a high output, and even if the transistor 48 is turned on and off repeatedly thereafter, the oscillation circuit 60 does not oscillate.

Reference numeral 62 designates a drive circuit for the first latching relay 11. When the power switch 25 is switched to the normally open contact 25' by the ignition operation, the transistor 63 for driving the closing side coil 11'' is turned on, and the first relay contact 11 is turned on. ′
At the same time, in the event of an abnormality such as a drop in the battery 24 voltage, the opening side coil 11 drive transistor 6 is closed.
4 to open the first relay contact piece 11.

(g) Effects of the invention With the configuration of the invention, heating of the object to be heated can be started, and a notification can be given only the first time when the temperature of the object to be heated reaches the set temperature, and thereafter the temperature can be maintained by controlling the strength and weakness of the burner, etc. There is no risk of misunderstandings such as misfires due to notification when heating occurs.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of the present invention, and FIG. 2 is an electric circuit diagram. 44...Second comparator, 49...Set input, 50...R-S flip-flop, 51...
Output, 52... One output, 56... CR timer, 58... Third comparator, 61... Sound generation means.

Claims (1)

[Scope of utility model registration request] The output of a comparator that compares the temperature of the heated object with the set temperature is connected to the set input of an R-S flip-flop, and one output of this flip-flop is connected to the output of another comparator and the comparison input of this comparator. A cooking device which is connected to a timer and also has a sounding means connected to the output of the other comparator, and operates the sounding means for a predetermined period of time only the first time when the object to be heated reaches a set temperature.