JPH0450489B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a safety device for automatic control of gas stoves, electric ovens, and other heating cookers.

Conventional configuration and its problems Recently, cooking appliances with automatic control functions have appeared on the market. Figure 1 shows the configuration of a gas stove as an example. FIG. 1 shows an example of an automatic temperature control device for a gas stove. Gas flowing in from a gas inlet 1 is branched from a manual gas stove 2 through a safety valve 3 to a pilot burner 4 and a main burner 5.
A control valve 6 is provided in the passage leading to the main burner 5,
The main burner 5 is controlled on and off. Reference numeral 7 is a control circuit that detects whether the gas stove is in use by a switch 2' that is linked to the gas stove 2, outputs an output to open the safety valve 3, and ignites the pilot burner 4 with an igniter (not shown). A temperature sensor 8 detects the temperature of the food 9 and compares it with the set temperature of the setting variable resistor 10, and outputs an on/off signal for the control valve 6. As a result, the main burner 5 is controlled on and off, but the pilot burner 4 continues to burn while the safety valve 3 is open. A combustion detector 11 detects when the pilot burner 4 misfires or fails to ignite, and the control circuit 7 outputs an output to close the safety valve 3.

Here, when the temperature of the sensor 8 is higher than the set temperature of the variable resistor 10, the main burner 5 is extinguished and only the pilot burner 4 is in a state of combustion. In order to improve cooking performance, it is desired that the combustion amount of the pilot burner 4 is as small as possible, making it difficult for humans to check the combustion of the pilot burner. Therefore, if the user mistakenly assumes that all burners have been extinguished when the main burner 5 is extinguished and removes the food 9, the pilot burner 4 will continue to burn forever, depending on the state of the sensor 8. This is extremely dangerous as the main burner 5 may also restart combustion, causing a fire outbreak. Furthermore, even if the device does not have a pilot burner, when the burner is extinguished or the amount of calories is reduced due to control operation, it may be mistaken for cooking to be complete. The same can be said for gas stoves and electric stoves.

Purpose of the invention The present invention solves the above-mentioned conventional problems.
To provide a highly safe automatic control cooker that automatically stops all heating sources after a certain period of time even if the food 8 to be cooked is removed.

Structure of the Invention In order to achieve the above object, the present invention includes a heating source that heats a food to be cooked, a heating control means that controls the amount of heating of this heating source, and a heating source that heats a food to be cooked by the heating source in a predetermined control sequence. The control circuit includes a control circuit that starts measuring time when the heating source starts heating, and starts heating the heating source when a predetermined fixed time that is longer than the cooking time according to the control sequence has elapsed. The structure includes a safety timer that outputs a signal to the heating control means to stop all heating.

With this configuration, if you accidentally forget to stop the heating source when you remove the food during or at the end of the cooking sequence, all heating is automatically stopped to prevent dangers such as fire. .

DESCRIPTION OF EMBODIMENTS Examples of the present invention will be described below with reference to FIGS. 2 and 3. FIG. 2 is a system diagram showing an example in which the present invention is applied to a gas stove. In Figure 2, the same parts as in Figure 1 are marked with the same symbols. The control circuit 7 has a built-in safety timer 12, and the safety timer 12 starts counting from the moment when the switch 2' linked to the lock 2 detects that the lock 2 is opened, and the safety timer 12 starts counting when the lock 2 is opened. If the safety valve 2 is not closed, a closing output is automatically sent to the safety valve 3 to extinguish the burner 5. Here, the predetermined time of the safety timer 12 differs depending on the cooking appliance, but by selecting a time longer than the time used for normal cooking, the user will not feel inconvenienced. It is thought that about 2 hours is preferable on a stove or oven.

FIG. 3 shows this schematic flow diagram. The safety timer 12 is started immediately after the switch 2' is turned on.
Open safety valve 3 and control valve 6. (Cooking start section) Normally, the temperature sensor 8 and the set temperature 10 are compared, and the loop passes through the control valve 6 and a temperature control section that controls opening and closing. The loop includes a burner extinguishing section that closes the safety valve 3 when the burner 2 is closed midway or when the burner 5 misfires, and when a safety timer 12 in this burner extinguishing section completes counting for a predetermined time, the burner extinguishing section closes the safety valve 3. It is configured to have a function of closing the safety valve 3. When the lock 2 is closed before the safety timer 12 counts up the time, the safety timer is initialized, and when the lock is opened again, a new safety timer is started.

Although the embodiment has been described above with a configuration in which the burner is controlled on and off, any configuration may be used as long as the amount of heating is variably controlled, such as multi-stage control or proportional control. Furthermore, although the embodiment has been described as an example in which the present invention is applied to a temperature controller for a gas stove, the present invention can also be applied to a gas oven or an electric stove, and can also be applied to a cooking device that does not perform temperature control.

Effects of the Invention As explained above, the safety device of the automatically controlled heating cooker of the present invention automatically stops heating when a certain period of time, which is longer than the cooking time in the control sequence, has elapsed after the start of heating the food. Since the configuration is equipped with a safety timer, it has the following effects.

(1) When a user forgets to cook and goes somewhere else, it is possible to prevent cooking from continuing to heat and causing cooking failure or burning.

(2) In particular, with automatic cookers that control the amount of heating through temperature control, etc., the automatic control may cause the heating to temporarily stop, and at this time the user may mistakenly think that the heating has stopped and cook the food. When you remove the object and move on to the next task, the heating source starts heating again and continues to operate indefinitely, which is extremely dangerous and can cause a fire.However, in this case, the present invention also uses the safety timer period. It can be used with confidence because all heating stops after .

(3) Since the safety timer is preset to a fixed, predetermined time that is longer than the cooking time using the cooker in a controlled sequence, it is cumbersome for the user to set the timer each time it is used. There is no
In addition, the user does not need to worry about the safety timer when cooking, and there is no difference from normal cooking operations.

(4) Since unnecessary heating is eliminated after cooking is completed, there is no wasted energy consumption.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing a conventional example of a temperature-controlled gas table stove; Fig. 2 is a control system diagram showing an embodiment of the present invention in which a safety device for an automatically controlled heating cooker is applied to a gas table stove; FIG. 3 is a schematic flow diagram showing the operation of the control circuit. 3... Safety valve (heating control means), 5... Burner (heating source), 6... Control valve (heating control means), 7...
...Control circuit, 12...Safety timer.

Claims (1)

[Claims] 1. A heating source that heats the food to be cooked, a heating control means that controls the amount of heating of the heat source, and a control circuit that controls the amount of heating of the food by the heat source in a predetermined control sequence, The control circuit starts measuring time when the heating source starts heating, and sends a signal to the heating control means to stop all heating of the heating source when a predetermined fixed time longer than the cooking time according to the control sequence has elapsed. A safety device for an automatically controlled heating cooker configured to have a safety timer that outputs an output.