JPH0420718A - Heating device for cooking - Google Patents

Abstract

PURPOSE:To prevent unnecessary continued heating with no objects being heated, which is caused by forgetting to stop heating, by providing a control means for carrying out a specified safety control when the absence of object being heated continues for a set allowable time in the heating condition. CONSTITUTION:A controller 5 has a safety control portion 5D for carrying out specified safety control, in addition to a overheat preventive control portion 5A, using a microcomputer 14 to prevent unnecessary continued burning with no object being heated, which is caused by forgetting to stop burning when a pan A is removed from a tripod 2. In carrying out the safety control, a limit switch 20 is positioned to detect the presence of pan A at the heating position. The limit switch 20 is turned on when the pan A is positioned on the tripod 2, and off when the pan A is removed from the tripod 2. With this safety control, when the absence of pan A continues for a set allowable time T3 in the burning condition, a buzzer sounds to urge user's extinguishing fire.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a heating device for cooking.

[Conventional technology]

BACKGROUND ART Conventionally, there have been heating devices for cooking that automatically stop heating when a set time has elapsed after starting heating, and devices that automatically stop heating when the temperature of the object to be heated rises to a set temperature.

[Problem to be solved by the invention]

However, devices that automatically stop heating when a set time has elapsed after the start of heating only specify the heating time after the start of heating. There is a problem in that if you forget to stop heating when the object to be heated is removed from the heating position when heating is no longer necessary and there is a considerable amount of time remaining, the heating state will continue unnecessarily for a long time remaining. .

Also, if the heating is automatically stopped when the temperature of the heated object rises to the set temperature, the heating is automatically stopped based on the temperature of the heated object, so the heating may stop before the heated object reaches the set temperature. If you forget to stop heating when the object to be heated is removed from the heating position because it is no longer needed, the automatic heating stop will not be executed and the heating state will continue unnecessarily because there is no condition for automatic heating stop. There was a problem.

An object of the present invention is to prevent unnecessary continuation of heating in a state where there is no object to be heated, as described above, which is caused by forgetting to stop heating when removing the object from the heating position.

[Means for Solving the Problems] A first characteristic configuration of the heating device for cooking according to the present invention is to provide a presence/absence detection means for detecting whether or not an object to be heated exists at a predetermined heating position, and to detect the presence/absence of the object. A control means is provided which executes a predetermined safety control when the non-existence state of the heated object continues for a set allowable time in the heating state based on the detection information of the means, and its functions and effects are as follows. It is.

[For production]

In other words, according to the first characteristic configuration, even if you forget to stop heating when the object to be heated is removed from the heating position, the object remains heated for the set allowable time from the time the object is removed from the heating position. If the object-absent state continues, the control means automatically executes a predetermined safety control, so as this predetermined safety control, a notification to prompt a heating stop operation or a control means to automatically stop the heating is executed. By doing so, unnecessary continuation of heating in a state where there is no object to be heated due to forgetting to stop heating when removing the object from the heating position can be prevented.

〔Effect of the invention〕

As described above, according to the first characteristic configuration of the present invention, unnecessary continuation of heating in a state where there is no object to be heated due to forgetting to stop heating as described above can be prevented, thereby preventing wasted heating energy and preventing fires. It is also possible to improve safety against such problems.

Incidentally, in order to prevent unnecessary continuation of heating when the object to be heated is not present, there is an alternative method, based on the detection of the presence or absence of the object to be heated, that can be performed immediately as soon as the object to be heated moves out of the predetermined heating position in the heated state. It is possible to automatically stop heating, but
This alternative method is used when it is necessary to temporarily remove the object from the heating position for a very short period of time and then return it to the heating position to continue heating (this is often the case in cooking). However, once the object to be heated is removed from the heating position, the heating automatically stops, which greatly reduces the usability of cooking.

In this regard, with the first characteristic configuration of the present invention, the control means executes the predetermined safety control when the non-existence state of the heated object continues for a set allowable time, in other words,
Even if the object to be heated is once removed from the heating position in the heating state, if the object to be heated is returned to the heating position before the set allowable time has elapsed, the predetermined safety control by the control means will not be executed. This has the advantage of preventing a decline in usability.

5 Second and third frame fine configuration of the present invention 2 A second characteristic configuration of the cooking heating device according to the present invention is that, as the safety control, notification is started when the set permissible time has elapsed, and from the start of this notification When the non-existence state of the object to be heated continues for a set grace period, the heating is automatically stopped when the set grace period has elapsed, and the presence/absence detecting means detects the presence of the object to be heated at the end of the set grace period. When detected, the control means is configured to execute control to continue the heating state even after the set grace period has elapsed. If this second characteristic configuration is adopted, The user can be prompted to stop heating, and if the user wants to continue cooking in response to this notification,
If the heated object is returned to the heating position at least once during the set grace period from the start of the notification, the heating state can be continued even after the set grace time has elapsed. When the object continues to be absent, the control means automatically stops heating when the set grace period has elapsed, thereby preventing unnecessary continuation of heating when the object to be heated is absent due to forgetting to stop heating. be done.

A third characteristic configuration of the heating device for cooking according to the present invention is to provide a temperature detection means for detecting the temperature of the object to be heated, and to control the control means when the temperature detected by the temperature detection means rises to a set temperature. The feature is that the configuration is configured to execute a predetermined overheating prevention control, and if this third characteristic configuration is adopted, the absence of the heated object due to forgetting to stop the heating operation when removing the heated object from the heating position can be avoided. In addition, unnecessary continuation of heating in a heated state can be prevented by the action of the first characteristic configuration described above, and in addition, if the heating stop operation is forgotten while the object to be heated is present in the heating position, the temperature detection means can detect. When the temperature of the heated object rises to the set temperature, the control means automatically executes a predetermined overheating prevention control.As this predetermined overheating prevention control, a notification prompting a heating stop operation and an automatic stop of heating are controlled. By having the heating device perform the operation, it is possible to reliably prevent overheating of the heated object due to forgetting to stop heating while the heated object is in the heating position. Overall, extremely high safety can be achieved against forgetting operations.

〔Example〕

Next, an example will be described.

Figure 1 shows the control configuration of a stove as an example of a heating device for cooking, where (1) shows the burner, (2) shows the 5 rL on which the pot (A) is placed, and (3) shows the gas to the burner (1). Appliance plug for intermittent fuel supply and adjustment of gas fuel supply amount, (4)
(5) is a controller.

Further, FIG. 2 shows the internal circuit configuration of the controller (5).

As for the operation configuration for ignition and extinguishing, the operating tool (4)
from the intermediate position (a), which is the extinguishing position, to the pushing position (
When the device is pressed down to b), the device plug (3) is opened by the force of the pressing operation, and the device plug switch (6), which is the energizing switch for the controller (5), is closed along with the pushing operation. At the same time, the ignition switch (7) is closed and the igniter (8) is turned on, causing the spark discharge of the spark plug (9) to start the burner (1).
ignites.

When the pushing operation is released, the operating tool (4) moves beyond the intermediate position (a) and moves to the protruding position (C) due to the biasing force.
However, due to the excitation of the electromagnetic coil (11) by the electromotive force of the thermocouple (10) heated by the burner ignition, the appliance stopper (3) resists the closing force even after the pushing operation is released. The valve is held open, thereby allowing combustion to continue.

Incidentally, if the ignition is ignited incorrectly, or if the ignition goes out or incomplete combustion occurs after ignition, the appliance stopper (3) will automatically close with a closing force due to insufficient electromotive force of the thermocouple (10).

When the instrument operating tool (4) is in the protruding position (c), the instrument stopper switch (6) is held in the open state. Further, by rotating the appliance control tool (4) located at the protruding position (c), the opening degree of the appliance plug (3) can be adjusted to adjust the firepower.

Then, when the appliance operating tool (4) at the protrusion value ff1 (C) is pushed to the intermediate position (a), which is the extinguishing position, the appliance tap (3) closes and the burner (1) extinguishes. At the same time, the device plug switch (6) is configured to open. In the figure, (12) is a power source battery.

In the controller (5), the temperature (tx) of the bottom of the pan detected by the thermistor (13) serving as a temperature detection means is set to the set temperature set by the temperature setting device (22) in order to prevent tempura from catching fire or burning. (ts), an overheating prevention control section (5A) that executes predetermined overheating prevention control, and a thermistor (
The microcomputer (14) is used to adjust each of the time adjustment units (5B) that adjust the required execution time of the overheating prevention control based on the comparison between the temperature (tx) detected by 13) and the separately set threshold temperature (tss). It is composed of:

Specifically, the overheating prevention control section (5A) is configured to execute the following control as the above-mentioned predetermined overheating prevention control (see FIG. 3(a)).

That is, in the combustion state where the appliance tap switch (6) is closed in step S1, the detected temperature (tx
) becomes equal to or higher than the set temperature (ts), the alarm operation of the buzzer (15) is started in step S3, and the alarm time (
Then, in step S5, it is determined whether or not the count of the notification time ('r+) has expired.

As a result of the determination in step S5, if the counting of the notification time (T1) has not been completed, it is determined in step S6 whether or not an artificial standby command has been given, and as a result, if the artificial standby command has not been given yet, In step S7, the detected temperature (
tx) is above the set temperature (ts) (that is, during the counting of the notification time (T1), the detected temperature (t
This is because there is a possibility that the temperature x) becomes lower than the set temperature (ts), and there is no need for notification).

As a result of the determination in step S7, if the detected temperature (tx) is lower than the set temperature (ts), there is no need for notification, so even though the count of open at notification (T1) has not yet been completed. First, in step S8, the notification operation of the buzzer (15) is stopped, and in step S9, the count value of the previous notification time (T1) is reset, and the process returns to step S2.

As a result of the determination in step S7, if the detected temperature (tx) is equal to or higher than the set temperature (ts), the process returns to step S5 because a subsequent notification is required.

As a result of the determination in the previous step S6, if an artificial standby command has been given, the notification time (TI) is counted in order to continue the combustion state (i.e., heating state) for a while according to the provision of this artificial standby command. is unfinished, but step S
At IO, the notification operation of the buzzer (15) is stopped, and at step Sll, the waiting time (T2) is started counting,
Subsequently, in step S12, it is determined whether or not the count of the waiting time (T2) has expired.

As a result of the determination in step SL2, if the count of the waiting time (T2) has expired, that is, if the waiting of the waiting time (T2) has been completed, the count value of the notification time (T1) up to that point is determined in step S13. and the waiting time (T
2), and then reset the detected temperature (t
x) is still above the set temperature (ts), the above-mentioned buzzer notification is to be performed again, and in case a manual standby command is given again during the second buzzer notification time (T1). In order to wait again for the waiting time (T2), the process returns from step 313 to step S2.

Furthermore, as a result of the determination in step S12, the waiting time (T2)
If the count has not yet been completed, it is determined in step S14 whether or not the set temperature (tS) has been changed during the counting of the standby time (T2), and as a result of the determination in step S14, the set temperature (ts ), the process returns to step SL2 to continue waiting, and if the set temperature (tS) has changed, the process returns to step 313 to return to the initial temperature monitoring state before the buzzer notification. The process returns to step S2 via .

In the first buzzer notification or subsequent repeated buzzer notifications, if the determination result in step S5 is that the count of the notification time (T1) has expired, that is, if the notification time (T1) has expired,
No manual standby command was given during the buzzer notification of T1),
If the detected temperature (tx) does not fall below the set temperature (ts), the buzzer (1) is activated in step S15.
Stop the notification operation of controller (5), and then
A transition is made to step S16 in which the automatic fire extinguishing execution a (5C) is caused to execute automatic fire extinguishing.

In other words, in the above-mentioned overheating prevention control, the detected temperature (tx) is basically the set temperature (ts
), a buzzer notification will start, and if the user gives a standby command during the buzzer notification time (T1) because immediate automatic extinguishing is rather inconvenient for cooking purposes, etc. The notification is stopped and the combustion state (heating state) continues for a predetermined standby time (T2), and then, at the expiration of the standby time (T2),
The buzzer notification is started again to inquire whether it is necessary to repeat the above waiting period.

Then, in the first buzzer notification or subsequent repeated buzzer notifications, if the user does not give the above standby command during the buzzer notification time (T1),
Extinguishes automatically when the buzzer notification time (T4) expires! (
5C), the burner (1) is automatically extinguished.

Specifically, in step S16, the automatic fire extinguishing execution R (5C) is performed by installing an intervening device in the electric circuit (16) connecting the thermocouple (10) and the electromagnetic coil (11) for holding the appliance valve open. By opening the relay switch (17), the device plug (3) is closed by a biasing force, and the burner (1) is extinguished.

On the other hand, the time adjustment section (5B) specifically controls the above-mentioned third
When the detected temperature (tx) becomes high and exceeds the threshold temperature (tss) due to periodic timer interrupts (see FIG. 3 (0)) for the control flow shown in FIG. Set the buzzer notification time (T1) and standby time (T2) to normal values (for example, T, , T2 = 60 seconds).
to a shortened value (for example, T l + T2 = 10 seconds) (
In this example, by doubling the counting speed of each of T, T2, TI is effectively achieved.

In addition, when the detected temperature (tx) returns below the threshold temperature (tss) due to thermal power adjustment, etc., the buzzer notification time (TI) and standby rvJ (T2) are changed from the above shortened value to normal. It is intended to execute control to return to the value.

In other words, when the detected temperature (tx) exceeds the threshold temperature (tss) and the risk of tempura fire or burnt food increases, the buzzer notification time (T4) and standby time (T2) are shortened and the above-mentioned overheating prevention control is activated. By shortening the required execution time, it is possible to avoid transitioning to automatic extinguishing in overheating prevention control from being too late due to buzzer notification or standby.

The thermistor (13), which serves as a temperature detection means for detecting the temperature (tx) of the bottom of the pot, has upper and lower parts that are pressed into contact with the bottom of the pot (A) placed on the trivet (2) by upward biasing by a spring (18). It is attached to the tip of the rod (19).

In addition, the command receiver for receiving manual standby commands is equipped with two types of means. One type is a limit switch (20) that is turned on by the downward movement of the upper and lower rods (19) and turned off by the upward movement. This limit switch (20) is set to O.
The microcomputer (14) is configured to determine that when the N state turns OFF and then turns ON again within a predetermined period of time, the microcomputer (14) processes this operation as a manual standby command. That is, the user can issue a manual standby command by moving the pan (A) up and down.

Furthermore, the other type is a push-button standby switch (2
1), and the push operation of this standby switch (21) is received as a manual standby command, and the user can control the above-mentioned up and down movement of the pot and press the standby switch (21) according to the working condition. It is now possible to issue an artificial standby command through any push-and-search operations.

The controller (5) has the above-mentioned overheat prevention control B (5
In addition to A), five? Safety that executes prescribed safety controls to prevent unnecessary continuation of combustion (continuation of heating) in the absence of a superheated object due to forgetting to connect the fire extinguisher when m(A) is removed from breather (2). side? il n (;ID) is configured by using a microcomputer (14), and in order to execute the above safety control, it is turned on when the pot (A) is placed on the trivet (2), From the trivet (2) to the pot (A
The aforementioned limit switch (20), which is turned OFF when the switch (A) is removed, is used as the presence/absence pressure detection means to detect the presence or absence of the pot (A) at the heating position.

And the safety controls mentioned above! Specifically, (5D) is a configuration in which, as the above-mentioned prescribed safety control, the following control is executed by periodic timer interrupts to the control flow shown in Fig. 3 (A). )reference).

That is, in step 3.20 the limit switch (2
The presence or absence of 1 (A) is determined based on the ON/OFF state of pot (A), and as a result of the determination in step S20, if the limit switch (20) is in the OFF state (i.e., the pot (A)
) is not on the trivet (2) which is the predetermined heating position), in step S21 the count of the set allowable time (T3)' (for example T3 = 60 seconds) is started, and then in step S22 the above setting is It is determined whether or not the count of the allowable time (T3) has expired.

As a result of the determination in step S22, the allowable setting time (T3)
If the count is not yet completed, this setting allowable time (
Since the pot (A) may be returned to the trivet (2) to continue heating during the counting of T3), step S
23, it is determined whether the limit switch (20) is in the ○N state or the OFF state, and as a result of this determination, if the limit switch (20) is still in the OFF state, the setting is changed. The process returns to step S22 to continue counting the allowable time (T3).

As a result of the determination in step S22, the allowable setting time (T3)
If the count has expired, the notification operation of the buzzer (15) is started in step S24, and the process is continued in step S24.
In step S25, the set grace time (T4) (for example, T, -60 seconds) for which the buzzer (15) should be activated is counted, and then, in step S26, the set grace time (T4) is counted.
) has expired.

As a result of the determination in step S26, the set grace period (T4)
If the count is not yet completed, this configured grace period (
During the count of T4) (that is, during the buzzer notification), the pot (A)
Since there is a possibility that the limit switch (20) is returned to the trivet (2) due to continued heating, it is determined again in step S27 whether the limit switch (20) is in the ON state or the OFF state. As a result, the limit switch (20
) is still in the OFF state, the process returns to step S26 to continue buzzer notification and counting of the set grace period (T4).

As a result of the determination in step S26, the set grace period (T4)
If the count has expired, the alarm operation of the buzzer (15) is stopped in step S28, and then the process proceeds to step S29, in which the automatic fire extinguishing unit (5C) in the controller (5) executes automatic fire extinguishing. conduct.

On the other hand, if the limit switch (20) is in the ON state as a result of the determination in each of the aforementioned steps S20, Step 323, and Step S27 (i.e., fi(A) is the predetermined heating position of 5 ft (2 ) on ), then
In step S30, the notification operation of the buzzer (5) is stopped, and the count value of the set allowable time (T3) and the count value of the set grace period (T4) are reset, and one step of the timer interrupt is completed.

In other words, in the above-mentioned safety control, the pot (A
) continues for the set allowable time (T3), a buzzer alarm is started to prompt the user to simulate extinguishing the fire, and then the combustion state is stopped for a set grace period (T4) from the start of the buzzer alarm. As it is (II! l] Chi, without the user performing a fire extinguishing imitation) Pot (
If the non-existence state of A) continues, the set grace period (T4
), the burner (1) is automatically turned on.

Also, because the pot (A) continues to heat up while counting the set allowable time (T3) or counting the set grace time (T4);=
If it is returned to the top of the trivet (2), it will continue to burn.

In summary, as a whole, pot (A) is five (afflicted (2)).
In case of accidental overheating caused by forgetting to simulate extinguishing while the heating position is on the upper heating position, the above-mentioned overheating prevention control can be used to reliably prevent m(A) from the heating position on the trivet (2). The above-mentioned safety control is used to reliably prevent unnecessary continuation of combustion when the pot is not present due to forgetting to prepare a fire extinguisher when removing the pot from the pot.

[Another example]

Next, another example will be listed.

(a) The object to be heated (A) is not limited to a pot, and the present invention can be applied to various heating devices for cooking other than stoves.

(b) The predetermined safety control may include only automatic heating stop or only notification, and the specific control content may be determined as appropriate.

(c) The specific structure and detection method of the detection means for detecting whether or not the object to be heated (A) exists at a predetermined heating position can be improved in various ways. It is also possible to employ a detection configuration in which the end of the sensor is used as the edge.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

Figures 1 to 3 show embodiments of the present invention, with Figure 1 being a control configuration diagram of the stove, Figure 2 being a circuit diagram, Figure 3 (A),
(B) and (C) are flowcharts. (5)... Control means, (13)... Temperature detection means, (20)... Existence detection means, (A
)...Overheated object, (T3)...Setting allowable time, (T4)...Setting grace time, (tx)...Detected temperature, ( ts)......Set temperature.

Claims (1)

[Claims] 1. Presence/absence detection means (20) for detecting whether or not the object to be heated (A) exists at a predetermined heating position is provided, and based on the detection information of the presence/absence detection means (20), In the heating state, the object to be heated (A) remains absent for a set allowable time (T_3)
A cooking heating device provided with a control means (5) that performs predetermined safety control when continued over a period of time. 2. As the safety control, the setting allowable time (T_3)
If the object to be heated (A) continues to be absent for a set grace period (T_4) from the start of the notification, heating will be automatically started at the time when the set grace time (T_4) has elapsed. and the set grace period (T_
When the existence of the object to be heated (A) is detected by the presence/absence detection means (20) during 4), control is executed to continue the heating state even after the set grace period (T_4) has elapsed. 2. The heating device for cooking according to claim 1, wherein said control means (5) comprises: . 3. Temperature detection means (13) for detecting the temperature of the object to be heated (A) is provided, and the control means (5) is controlled so that the detected temperature (tx) by the temperature detection means (13) is a set temperature (ts
3. The heating device for cooking according to claim 1, wherein the cooking heating device is configured to execute predetermined overheat prevention control when the temperature rises to .