JP3204498B2 - Cooker control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooker control device suitable for a gas stove or the like.

[0002]

2. Description of the Related Art Conventionally, a gas stove of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-219463. According to this publication, a gas stove is configured by an igniter for igniting a burner, a flame detection circuit for detecting a flame signal due to the flame of the burner, and a control unit. A lever for switching the burner between strong combustion and weak combustion is provided.

[0003]

On the other hand, in the above-mentioned gas stove, combustion is relatively stable during strong combustion, and it is difficult to misfire with a slight boil or wind. Sometimes, an electromagnetic valve provided in the gas passage to the burner is closed, so that it is necessary to perform an ignition operation each time, which is not convenient.

[0004]

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an igniter for igniting a burner, detects the flame of the burner, and outputs a flame signal corresponding to the state of the combustion flame. A flame detection circuit; and a control unit connected to the igniter and the flame detection circuit. The control unit is configured to operate the igniter when the flame signal becomes equal to or less than a predetermined value while the burner is weakly burning. It is what was constituted.

According to the present invention, an electromagnetic valve for opening and closing a gas passage to a burner is provided, and a control unit controls a igniter to perform a re-ignition operation when a flame signal becomes equal to or less than a predetermined value. Even if this re-ignition operation is performed, if the flame signal is equal to or less than a predetermined value within a predetermined time set in advance, the electromagnetic valve is closed to stop supplying fuel to the burner.

Further, according to the present invention, the control unit is configured to operate the igniter for a predetermined period of time when the flame signal becomes equal to or less than a predetermined value.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A control device for a cooker according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a gas stove using the control device, and FIG. 2 is an electric block diagram of the control device.

First, in FIG. 1, a main body 1 is made of, for example, an iron plate or the like, and is formed in a box shape so that an upper surface is open. The stove burners 2, 3 are arranged on the left and right of the upper surface of the main body 1, and the grill 4 is arranged between these stove burners 2, 3. The operation panel 5 is disposed on the front surface of the main body 1, and the push buttons 6, 7, and 8 are for performing ignition and fire extinguishing operations of the stove burner 2, the stove burner 3, and the grill burner (not shown), respectively.

Each of the push buttons 6 and 7 is provided with each valve device, and each of the valve devices is provided with each cock switch 9, each ignition switch 10 and each solenoid valve 11 (FIG. 2).
Then, for simplicity, cock switch 9 and ignition switch 1
0 and only one set of the solenoid valve 11 are shown). When the user pushes the push button 6 or 7 for the first time, the cock switch 9 is turned on, and at the same time, the solenoid valve 11 is turned on (open).
Then, after a short delay, the ignition switch 10 is turned on. Thus, the solenoid valve 11 opens and closes the gas passage to the stove burner 2 or 3.

Each ignition plug (not shown) is disposed near the stove burners 2, 3, and each ignition plug is
2 (FIG. 2 shows only one igniter 12)
Is connected. As described above, when the push button 6 or 7 is depressed for the first time, the ignition switch 10 is turned on for a certain time and the igniter 12 is turned on (spark) for a certain time.

When the user presses the push button 6 or 7 again, the cock switch 9 is turned off and the solenoid valve 11 is turned off (closed).

The operation panel 5 is provided with a stove burner 2 and a stove burner 3 by sliding operations in the left and right directions.
And thermal power control levers 13, 14, 15 for varying the amount of combustion of the grill burner. Thermal power control lever 1
A heating power control switch 16 is mounted on 4 and when the heating power adjustment lever 14 is slid to the left and set, the stove burner 3 burns strongly and the heating power control switch 16 is turned off (high heat side).
I do. When the heating power control lever 14 is slid rightward, the stove burner 3 burns weakly, and the heating power control switch 16 is turned on (low heat side).

The flame detection circuit 17 (see FIG. 2) detects a flame signal (electromotive force) according to a thermocouple which is heated by the combustion flame of the stove burners 2, 3 and generates an electromotive force.
The temperature sensor 19 is composed of a thermistor or the like, is arranged near the stove burner 3, and the temperature detection circuit 18 detects the temperature of the object to be cooked by the output of the temperature sensor 19.

The dry battery 20 is housed in the back of the cover of the operation panel 5 and supplies power to the power supply circuit 22. Grill 4
A grill door 23 is arranged on the front surface of the main body 1, a top plate 23 is arranged on the upper surface of the main body 1, a discharge hole 24 is formed behind the top plate 23, and a gotoku 25 is arranged around the stove burners 2 and 3. .

Next, as shown in FIG. 2, the control unit 26 comprises, for example, a microcomputer. The flame detection circuit 17 and the temperature detection circuit 18 are each connected to an input terminal of the control unit 26. The cock switch 9, the ignition switch 10, and the thermal power control switch 16 are each connected to an input terminal of a control unit 26 via a switch detection circuit 27, and the dry cell 20 is connected to an input terminal of the control unit 26 via a power supply circuit 22. ing.

The solenoid valve 11 is connected to an output terminal of a control unit 26 via a solenoid valve drive circuit 28, and the igniter 12 is connected to an output terminal of the control unit 26 via an igniter drive circuit 29. With these parts, the control device 30 for the cooking device
The gas stove 31 is constructed using the gas stove.

Next, the operation of the gas stove 31 will be described with reference to the time chart of FIG. In FIG. 3, when the user first pushes the push button 7, the cock switch 9 is turned on (FIG. 3a), and the solenoid valve 11 is opened (on) (FIG. 3g).
At the same time, the ignition switch is turned on (ignition) (FIG. 3b), and the igniter 12 is activated (FIG. 3f) to start sparking.

As a result, the gas ejected from the stove burner 3 ignites and forms a combustion flame. The thermocouple is heated,
When the flame signal output by the flame detection circuit 17 increases and exceeds a predetermined value (electromotive force of 3 mV), the control unit 26 determines that "flame exists". And the stove burner 3 continues stable strong combustion (FIG. 3d).

On the other hand, when the user slides the heat control lever 14 to the right to set the combustion mode to weak combustion, the heat control switch 16 is turned on (FIG. 3c). At this time, when the combustion flame becomes unstable and the electromotive force of the thermocouple decreases, and the flame signal output from the flame detection circuit 17 falls below a predetermined value (for example, 3 mV), the control unit 26 detects this. Then, a Hi-level re-ignition signal is output to the igniter drive circuit 29 for a predetermined period of time (for example, about 3 seconds) (FIG. 3E).

As a result, the igniter 12 is actuated again (FIG. 3f) to start sparking. If the stove burner 3 is in a misfire state, it ignites again to form a combustion flame, and in an unstable combustion state. If there is, combustion is promoted to continue stable weak combustion (FIG. 3d).

In this case, as shown in FIG. 3D, during a predetermined time (for example, about 8 seconds) elapse (point A) after the flame signal becomes equal to or less than a predetermined value (for example, 3 mV), the flame signal is output. When the value has recovered to the predetermined value or more, the control unit 26 controls the electromagnetic valve 11 to continue opening. On the other hand, if the flame signal is less than the predetermined value (point B) even after the predetermined time has elapsed after the flame signal has dropped below the predetermined value,
The electromagnetic valve 11 is closed to shut off gas supply to the stove burner 3.

If the flame signal does not exceed the predetermined value even after the predetermined time has elapsed after the flame signal has become less than the predetermined value and the re-ignition operation has been performed, the stove burner 3 has a large amount of boiling water. Is adhered and the flame holes are clogged. Therefore, in the above case, it is better to shut off the supply gas to prevent danger.

Further, after the flame signal becomes equal to or less than a predetermined value (3 mV), the igniter 12 may be ignited for a predetermined time (for example, about 3 seconds), and the flame signal becomes equal to or less than the predetermined value (3 mV). And then a second predetermined value (for example, about 1.5 mV)
The ignition device 12 may be caused to perform an ignition operation until the pressure reaches the threshold value. Thus, the stove burner 3 performs stable weak combustion.

Thereafter, when a flame signal of a predetermined value (3 mV) or less is again input to the control unit 26, the control unit 26 outputs a Hi-level re-ignition operation signal (FIG. 3E), and the igniter 12 starts sparking. Perform ignition operation. However, at this time, if a large amount of boil-off has adhered to the stove burner 3, after a lapse of a predetermined period of time (B
(Point), the flame signal is less than the predetermined value (FIG. 3d).

As a result, at the time point B, the control unit 26
The solenoid valve 11 is turned off (FIG. 3g), and the supply gas is shut off. Thereafter, when the user presses the push button 7 again, the cock switch 9 is turned off and returns to the original state. This concludes the description of the operation of the gas stove 31.

[0027]

As described above, according to the present invention, when the flame signal becomes equal to or less than a predetermined value while the burner is weakly burning, the igniter is operated to perform a re-ignition operation. Even if the combustion becomes unstable, it detects this and activates the igniter to prevent misfire as much as possible, and automatically reignites even if it is misfired due to temporary boiling or blowing out. Is performed to continue the combustion, so that the user does not need to perform the re-ignition operation, and the usability can be improved.

Also, according to the present invention, if the flame signal continues to be lower than the predetermined value even after a predetermined time has elapsed after the flame signal is reduced to a predetermined value or less and the igniter is operated and the reignition operation is performed, By closing the solenoid valve and stopping the fuel supply to the burner, if the burner has a large amount of boil-off and it cannot be ignited even if the re-ignition operation is performed, The gas supply to the burner is stopped at an early stage to prevent the spouting of raw gas and to avoid danger.

Further, the present invention is configured such that when the flame signal drops below a predetermined value, the igniter is operated only for a certain period of time. If the ignition is not possible even after performing the above, the gas supply to the burner can be stopped at an early stage to perform the safe operation.

[Brief description of the drawings]

FIG. 1 is a perspective view of a gas stove using a cooker control device according to an embodiment of the present invention.

FIG. 2 is an electric block diagram of the cooker control device.

FIG. 3 is a time chart of the gas stove.

[Explanation of symbols]

 3 Burner (for stove) 12 Igniter 17 Flame detection circuit 26 Control unit

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Akira Beef Akira 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori Sanyo Electric Co., Ltd. (56) References JP-A-8-219463 (JP, A) JP Hei 2-195114 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 5/24 106 F23N 5/00 F24C 3/12

Claims (3)

(57) [Claims] And 1. A igniter to ignite the bar burner detects a flame of the burner, a flame detection circuit for outputting a fire signal according to the state of the combustion flame, the flame detection circuit and the igniter A control unit connected thereto, wherein the control unit is configured to operate the igniter when the flame signal becomes equal to or less than a predetermined value while the burner is weakly burning. Control device for cooker characterized by the following. Wherein Rutotomoni provided an electromagnetic valve for opening and closing the gas passage to the burner, the control unit, the flame signal is pre-set
When the value falls below the specified value, the igniter is operated to re-start.
Even if a fire operation is performed and this re-ignition operation is performed,
If the flame signal is equal to or less than a predetermined value within a predetermined time,
Closes the solenoid valve and stops fuel supply to the burner
The control device for a cooker according to claim 1, wherein the control device is configured as described above. 3. The controller according to claim 1 , wherein said flame signal is set in advance.
When the igniter falls below a predetermined value,
The above-mentioned claim, characterized in that it is configured to operate for a time.
3. The control device for a cooker according to 2 .