JP2011106806A - Gas cooking stove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas cooking stove performing roast cooking without using a cooking container from an initial period of ignition by receiving release of an operation of a cooking container detecting function before performing a manual igniting operation even in a case of providing a manual igniting operation type gas cooking stove with the cooking container detecting function, and ensuring safety even when the cooking container is removed during combustion of a gas burner. <P>SOLUTION: A control section 8 of this gas cooking stove 1 includes the cooking container detecting function for preventing heating of the gas burner 11 when non-existence of the cooking container is detected by a cooking container detecting means 15 when the manual igniting operation is performed by an ignition/extinction button 3, a fire power controlling function for reducing fire power of the gas burner 11 when the non-existence of the cooking container is detected by the cooking container detecting means 15 during combustion of the gas burner 11, and a releasing function for releasing the operation of the cooking container detecting function when a release key 9 disposed on a cooking stove body 10 is switched on. The releasing function cancels the release of the operation of the cooking container detecting function in a case when the manual igniting operation is not performed within a given time from the switching-on of the release key 9. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a gas stove provided with an appliance plug provided with a manual open / close valve that is manually opened during ignition operation of a gas burner.

  This type of gas stove is configured to be ignited by supplying a gas to the gas burner with the instrument plug fully opened by a manual ignition operation due to the mechanical structure of the instrument plug. Even in such a gas stove, in order to prevent combustion of the gas burner without a cooking container such as a pan on the gas burner from the beginning of ignition, a cooking container detection function for detecting the presence or absence of a cooking container on the gas burner by a cooking container detection sensor is provided. There is one provided (Patent Document 1). According to the gas stove of Patent Document 1, when the control unit is turned on by manual ignition operation with a point fire extinguishing button and it is detected that there is no cooking container on the gas burner, the heating power is reduced to a small fire immediately after ignition of the gas burner, and then the fire is extinguished. Therefore, the combustion of the gas burner is not continued in the state where there is no cooking container from the beginning of ignition.

JP 2007-46799 A

  However, since the gas burner does not continue the combustion of the gas burner in a state where the cooking container is not placed on the virtues during the manual ignition operation, it is not possible to perform paste cooking such as glue that is desired to be performed without the cooking container. Therefore, it is conceivable to provide a release key for releasing the operation of the cooking container detection function in the gas stove.

  In this case, when the power button is turned on, the control unit is turned on, and if a gas stove in which the ignition of the gas burner is automatically controlled by the motor operated valve by operating the operation button, the release setting by the release key is accepted before the ignition operation. Can be done easily. However, in the above-described manual ignition operation type gas stove, since the power is not turned on to the control unit unless the ignition operation is performed by the fire extinguishing button, the release setting is accepted even if the release key is turned on before the ignition operation. I can't. Therefore, in order to cook a paste such as glue, the user performs a manual ignition operation with the cooking container placed on the gas burner to ignite the gas burner, and then turns on the release key to activate the cooking container detection function. It is necessary to perform the operation of releasing the operation and performing the cooking with the cooking container retracted, which is not convenient. In this case, when it is desired to cook, the user is forced to perform a troublesome operation, and the user needs to move the cooking container in a state where the gas burner is lit.

  On the other hand, if the cooking container is withdrawn from the gas burner during combustion of the gas burner, there is a risk of causing a dangerous event of a direct fire due to a large fire when the gas burner is on a large fire, and it is desirable to prevent this appropriately.

  The present invention has been made in view of the above circumstances, and even when a manual ignition operation type gas stove is provided with a cooking container detection function, safety can be ensured by a normal use ignition operation, and during special cooking Before the manual ignition operation is performed, the release of the cooking container detection function can be accepted, and it is easy to use so that it can be cooked even if there is no cooking container from the beginning of ignition, and the cooking container is opened during gas burner combustion. It is an object to provide a gas stove that can ensure safety even if it is rejected.

The gas stove according to the present invention is
A gas stove configured to manually turn on a fire extinguisher button installed on the stove body so that the manual opening / closing valve of the appliance plug is opened and gas is supplied to the gas burner, and the control unit is turned on.
A cooking container detection means for detecting the presence or absence of a cooking container on the gas burner is provided,
The control unit includes a cooking container detection function for preventing heating of the gas burner when the cooking container detection means detects that the cooking container is absent when a manual ignition operation is performed with a point fire extinguishing button, and a cooking container detection means during combustion of the gas burner. When the absence of a cooking container is detected, it has a thermal power control function that reduces the thermal power of the gas burner to a small fire, and a release function that releases the cooking container detection function when the release key provided on the stove body is turned on,
The release function of the control unit has a control configuration in which the release of the operation of the cooking container detection function is canceled when a manual ignition operation is not performed within a predetermined time after the release key is turned on.

  According to the above configuration, when there is no cooking container on the gas burner during the manual ignition operation by the cooking container detection function of the control unit, the gas burner is prevented from being heated. During the operation, it is possible to avoid a dangerous event caused by a direct fire due to the absence of a cooking container.

  In addition, if the cooking vessel is withdrawn from the gas burner by the thermal power control function of the control unit, the thermal power of the gas burner is reduced to a small fire. An event can be avoided and safety can be improved. And, when the cooking container is temporarily lifted by a pan shake or the like during gas burner combustion, the fire is merely extinguished and is not extinguished.

  Moreover, since the cancellation | release function which cancels | releases the said cooking container detection function is provided, the operation cancellation | release of a cooking container detection function can be received before manual ignition operation in the case of special cooking. As a result, the gas burner can be ignited and burned without the cooking container being placed on the gas burner at the user's will, so even if there is no cooking container from the beginning of ignition, the gas burner can be burned, and paste cooking such as paste It can be performed.

By the way, if the operation of the cooking container detection function can be canceled before the manual ignition operation and the operation of the cooking container detection function is always canceled if the release key is turned on, the user has canceled the cooking container detection function. It is possible to forget to manually operate the ignition without the cooking container. Then, even if it has a cooking container detection function, the gas burner is ignited and burned when manual ignition operation is performed without the cooking container without being aware of the release of the operation. Can cause dangerous events due to direct fire.
On the other hand, according to the release function of the above configuration, since the operation release of the cooking container detection function is effective only for a certain time before the manual ignition operation, there is no cooking container forgetting that the cooking container detection function has been released. In this state, manual ignition operation is prevented. At the same time, the user is aware of the release of the cooking container detection function and manually ignites the gas burner without the cooking container. Therefore, safety can be ensured even if a release key is provided.

It is desirable that the thermal power control function of the control unit has a control configuration in which the gas burner is extinguished when the heating power of the gas burner is reduced to a small fire and the state without the cooking container is continued for a predetermined time.
This prevents the combustion state of the gas burner from being left without a cooking container. Therefore, it is possible to improve safety by avoiding a dangerous event caused by direct fire when there is no cooking container, and it is possible to prevent wasteful consumption of fuel gas.

A gas amount adjusting valve is provided between the instrument plug and the gas burner,
The gas amount adjusting valve is provided with an opening / closing valve and an orifice passage having a narrow gas passage in parallel,
It is desirable that the heating power control mechanism of the control unit has a control configuration in which the on-off valve is controlled to be closed so that the gas flows only through the orifice passage and the heating power of the gas burner is reduced to a small fire.
Thus, by controlling the opening / closing valve to close, the heating power of the gas burner can be forced to be small regardless of the heating power setting of the heating power adjustment lever.

  As described above, according to the present invention, even in the case of a manually ignited gas stove, it is possible to avoid a dangerous event caused by a direct fire caused by the absence of a cooking container during the manual ignition operation by the cooking container detection function. Sex can be secured. Further, even when the gas burner is being burned by the thermal power control function, it is possible to ensure safety by avoiding a dangerous event caused by a direct fire without a cooking container. In addition, according to the release function, since the release of the cooking container detection function is accepted before the manual ignition operation is performed, the gas burner is burned without the cooking container from the beginning of ignition and cooked by the user's intention. In addition, the user-friendliness is not limited by the provision of the cooking container detection function.

It is a front view which shows the external appearance structure of the gas stove with a cooking container detection function by this embodiment. It is a schematic diagram explaining the operation | movement at the time of detecting the presence or absence of a cooking container by a cooking container detection means. It is a schematic diagram which shows the gas circuit structure of the gas stove with a cooking vessel detection function by this embodiment. It is sectional drawing which shows the structure of the latch type solenoid valve which comprises a gas cutoff valve. It is a side view which shows the structure of the microswitch provided in the point fire extinguishing button. It is a timing chart which shows the relationship between operation of a point fire extinguishing button, and operation | movement of an instrument plug. It is a block diagram which shows the circuit structure of a control unit. It is a flowchart which shows operation | movement of the cooking container detection function at the time of ignition operation. It is a flowchart which shows operation | movement of the cancellation | release function at the time of ignition operation. It is a flowchart which shows the operation | movement during gas burner combustion.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, the gas stove 1 has a rectangular box-shaped stove body 10, and a top plate on the top surface of the stove body 10 is provided with a two-hole stove unit 13 including a gas burner 11. In each stove unit 13, the virtue 12 is arranged around the gas burner 11. A cooking container temperature sensor 14 is provided at the center of each stove 13 for detecting the cooking container bottom temperature by contacting the bottom of the cooking container A such as a pan. The cooking vessel temperature sensor 14 is supported by the stove body 10 so as to be movable up and down. Furthermore, as shown in FIG. 2, a cooking container detection means 15 such as a micro switch for detecting the raising / lowering state of the cooking container temperature sensor 14 is provided at the base end of the cooking container temperature sensor 14. When there is no cooking container A in the virtues 12, the cooking container detection means 15 is in the off state because the cooking container temperature sensor 14 is in the raised position (see FIG. 2 (a)). Moreover, when the cooking container A is in the virtues 12, the cooking container temperature sensor 14 is lowered and turned on (see FIG. 2B). Therefore, the presence or absence of the cooking container A on the gas burner 11 is detected from the on / off signal of the cooking container detection means 15.

  Referring again to FIG. 1, on the front portion of the stove body 10, a fire extinguishing button 3 for turning off the gas burner 11 of each stove part 13, and a thermal power adjustment for adjusting the thermal power of the gas burner 11 of each stove part 13. A lever 4 is provided corresponding to each gas burner 11. A fire extinguishing button 3 and a heating power adjustment lever 4 corresponding to each stove 13 are provided in a gas passage between a gas pipe (not shown) and the gas burner 11 to control gas supply from the gas pipe to the gas burner 11. 2 is connected. Further, a release key 9 for releasing the operation of a cooking container detection function described later is provided on the front portion of the stove body 10.

  As shown in FIG. 3, the instrument plug 2 is a mechanical instrument plug that is manually opened during the ignition operation by the point fire extinguishing button 3. The instrument plug 2 is formed with an internal gas passage 23 communicating from the inlet 21 to the outlet 22 in the valve housing 20, and the internal passage 23 has an electromagnetic safety valve 25 and an original gas valve 24 from the upstream side. The needle valve 26 for adjusting the gas amount is accommodated. The original gas valve 24 is fixedly attached to a predetermined position of the rod 27, and the electromagnetic safety valve 25 is disposed so as to be pressed at the distal end portion of the rod 27. The base end portion of the rod 27 is opposed to the slider portion 30 of the point extinguishing button 3, and the rod 27 is moved to the distal end side via the slider portion 30 when the point extinguishing button 3 is pushed. The original gas valve 24 and the electromagnetic safety valve 25 are urged toward the valve closing side (the side on which the fire extinguishing button 3 is disposed) by the coil springs 28 and 29.

The appliance plug 2 is in a closed state in which the original gas valve 24 and the electromagnetic safety valve 25 are in contact with the valve seat in a state in which the fire extinguishing button 3 is in the starting position where the push-in operation (ignition operation) is not performed. The internal passage 23 is closed. When the point-extinguishing button 3 is pushed (ignited), the original gas valve 24 is opened away from the valve seat against the urging force of the coil spring 28, and then the point-extinguishing button 3 is predetermined. When pushed to the position, the electromagnetic safety valve 25 is pressed against the rod 27 and separated from the valve seat against the urging force of the coil spring 29 to be opened. The electromagnetic safety valve 25 has an adsorption piece 25a attached to the rear end thereof. When the fire extinguishing button 3 is pushed to a predetermined ignition position, the adsorption piece 25a is adsorbed to an electromagnet 25b disposed on the back side thereof, and the valve is opened. Retained. Thereby, the instrument plug 2 is maintained in an open state, and gas flows into the internal passage 23. In the present embodiment, the original gas valve 24 and the electromagnetic safety valve 25 constitute a manual open / close valve that is manually opened when the gas burner 11 is ignited, and both the original gas valve 24 and the electromagnetic safety valve 25 are opened. It is defined that the manual on-off valve is open.

  The needle valve 26 is connected to the heating power adjustment lever 4 via a cam plate 26a. Accordingly, the needle valve 26 is moved forward and backward through the cam plate 26a by the operation of the heating power adjusting lever 4, the flow rate of the gas flowing through the internal passage 23 is adjusted, and the heating power of the gas burner 11 is adjusted.

  The point-extinguishing button 3 is provided with a heart cam type push-push mechanism comprising a heart-shaped cam groove 31 and an engagement element 32 engaged therewith, and the pressing is released after the point-extinguishing button 3 is pushed to the end position. Then, the fire extinguishing button 3 is locked at the holding position before the starting end position. At the holding position of the point fire extinguishing button 3, the original gas valve 24 is held open, and the electromagnetic safety valve 25 is released from being pressed by the rod 27, but the attracting piece 25a is attracted and held by the electromagnet 25b against the coil spring 29 and opened. The valve is held.

  Further, a gas amount adjusting valve 6 and a gas shut-off valve 7 are arranged in series from the upstream side at a downstream position of the instrument plug 2 between the instrument plug 2 and the gas burner 11. The gas amount adjusting valve 6 is provided with an on-off valve 61 and an orifice passage 62 having a narrow gas passage in parallel. By the gas amount adjusting valve 6, the on-off valve 61 is closed, so that the gas flows only through the orifice passage 62, and the heating power of the gas burner 11 is forcibly reduced to a small fire.

  The gas shut-off valve 7 is constituted by a latch type electromagnetic valve (self-holding type electromagnetic valve). As a latch type electromagnetic valve, for example, as shown in FIG. 4, a plunger 71 is attached to a valve body 73, an electromagnetic coil 75 is arranged around the plunger 71, and an excitation current is supplied to the electromagnetic coil 75 to thereby move the plunger. The valve body 73 is opened and closed by moving 71. In the closed state of the valve body 73, the valve body 73 is urged by the spring 76 so as to close the valve port 72, and the valve body 73 is closed, and in the opened state of the valve body 73, the plunger 71 is moved by the permanent magnet 74. The valve element 73 is held open so as to adsorb and open the valve port 72. Therefore, since the latch-type solenoid valve does not require holding power in the open state and the closed state, power consumption can be suppressed. Can be prevented. The on-off valve 61 of the gas amount adjusting valve 6 can also be constituted by a latch type electromagnetic valve.

  Further, as shown in FIG. 5, a cam 33 is fixed to the slider portion 30 of the fire extinguishing button 3, and a micro switch 5 that is turned on and off by the cam 33 is disposed in the vicinity of the cam 33. Yes. The micro switch 5 constitutes a position detecting means for detecting the manual operation position from the start end position to the end position of the point extinguishing button 3 in two stages. The microswitch 5 is a two-contact type having two independent contacts inside, and includes a movable piece 51 that comes into contact with the surface of the cam 33, and the point-extinguishing button 3 is pushed to move the movable piece 51 to the intermediate position. When pushed, the first contact (SW1) is turned on, and when the fire extinguishing button 3 is pushed further and the movable piece 51 is pushed further, the second contact (SW2) is turned on.

As shown in FIG. 6, the first-stage manual operation position at which the first contact (SW1) is turned on is set to a position immediately after the original gas valve 24 is opened. When the first contact (SW1) is turned on, the electromagnet 25b of the electromagnetic safety valve 25 is excited. In the present embodiment, immediately after the micro switch 5 detects the first-stage manual operation position, the original gas valve 24 is in the opened state, but the electromagnetic safety valve 25 does not operate even if the electromagnet 25b is excited. Closed. The second-stage manual operation position where the second contact (SW2) is turned on is set to a position immediately before the electromagnetic safety valve 25 is opened. Therefore, at the time of detection of the second-stage manual operation position, only the original gas valve 24 of the instrument plug 2 which is a manual on-off valve is opened. When the cooking container A is on the gas burner 11 or when the operation of the cooking container detection function described below is canceled, when the second contact (SW2) is turned on, the valve opening control of the gas cutoff valve 7 and the driving of the igniter are performed. Control or the like is executed. Although the microswitch 5 is a two-contact type, the manual operation position of the fire extinguishing button 3 may be detected in two steps using two single-contact microswitches.

  Moreover, the stove body 10 incorporates a control unit 8 that controls the operation of the gas stove 1 (see FIG. 1). The control unit 8 includes a control circuit 80 constituted by a microcomputer or the like. This control circuit 80 is an ignition control that constitutes a cooking container detection function for preventing the gas burner 11 from being heated when the cooking container detection means 15 detects that there is no cooking container when a manual ignition operation is performed with the fire extinguishing button 3. , A release setting unit that constitutes a release function that enables the release of the cooking container detection function by turning on the release key 9 before the manual ignition operation is performed with the point fire extinguishing button 3, and combustion of the gas burner 11 When the cooking container A is withdrawn from the gas burner 11 inside, a thermal power control unit that constitutes a function for reducing the thermal power to a small fire is provided. In addition to the control circuit 80, the control unit 8 includes a power supply circuit 81, a first switch detection circuit 82, a second switch detection circuit 83, a power holding circuit 84, and the like (see FIG. 7).

  By the way, this gas stove 1 has a configuration in which the power to the control circuit 80 is turned on by a manual ignition operation with the fire extinguishing button 3 without a power button, but when the release key 9 is turned on before this manual ignition operation. Also, the control circuit 80 is configured to be turned on for a certain time (for example, 10 seconds). More specifically, as shown in FIG. 7, when the fire extinguishing button 3 is pushed and the micro switch 5 is turned on (for example, the first contact is turned on), the first switch detection circuit 82 causes the SW on signal sg1. Is input to the power supply circuit 81 and the control circuit 80. When the SW on signal sg1 is input from the first switch detection circuit 82, the power supply circuit 81 starts up the power supply and activates the control circuit 80. At the holding position of the above-mentioned fire extinguisher button 3, the micro switch 5 is kept on (for example, the first contact is on), so the first switch is detected even if the fire extinguisher button 3 is pushed and released. The output of the SW on signal sg1 from the circuit 82 to the power supply circuit 81 is maintained, and the power supply to the control circuit 80 is maintained. Thereby, each control of the gas stove 1 can be executed by the control circuit 80.

On the other hand, when the release key 9 is turned on, the release switch on signal sg 2 is input to the power supply circuit 81 and the control circuit 80 by the second switch detection circuit 83. When the release SW on signal sg2 is input from the second switch detection circuit 83, the power supply circuit 81 starts up the power supply and activates the control circuit 80. Since the release key 9 is a tact switch, when the release key 9 is released, the output of the release SW on signal sg2 from the second switch detection circuit 83 is stopped, but the control circuit 80 has a second switch detection circuit. When the release SW on signal sg 2 is input from 83, the power holding signal sg 3 is output to the power holding circuit 84. Then, the power holding circuit 84 continues to output the power holding signal sg3 to the power circuit 81 until a certain time (for example, 10 seconds) elapses, and thereby the power supply to the control circuit 80 is held. When a certain time has elapsed, the output of the power holding signal sg3 from the power holding circuit 84 to the power circuit 81 is stopped, and the power supply from the power circuit 81 to the control circuit 80 is stopped. In this way, the control circuit 80 is supplied with power when the release key 9 is turned on even before the manual ignition operation with the fire extinguishing button 3, and the release SW on signal is supplied only for a certain time before the manual ignition operation. Release of the operation of the cooking container detection function by sg2 can be accepted. Then, when the microswitch 5 is turned on by manual ignition operation of the fire extinguishing button 3 within the predetermined time, the power supply to the control circuit 80 is maintained as described above. Therefore, in this case, since the release of the cooking container detection function is accepted by the release setting unit of the control circuit 80, the gas burner 11 can be operated even when the cooking container A is not placed on the gas burner 11 by the user's intention. Can be ignited and burned.

  Next, a cooking container detection function that operates when the gas stove 1 having the above-described configuration is ignited will be described. In the cooking container detection function, the following operation control is performed by the ignition control unit of the control circuit 80. Referring to the flowchart of FIG. 8, in order to start the ignition operation (S1), when the fire extinguishing button 3 is pushed in, the original gas valve 24 of the appliance plug 2 is opened (S2). When the first position of the instrument plug manual operation position is detected by the micro switch 5 by pressing the point fire extinguishing button 3 (S3), the control unit 8 (control circuit 80) is turned on and the instrument plug 2 is turned on. The electromagnetic safety valve 25 is excited by applying a current to the electromagnet 25b (S4). And the presence or absence of the cooking container A is monitored by the cooking container detection means 15, and it is determined whether the cooking container A is arrange | positioned on the gas burner 11 (S5).

  At this time, when it is determined that there is no cooking container A (“No” in S5), when the second switch on the manual operation position is detected by the micro switch 5 by further pressing of the fire extinguishing button 3 ( S6) The valve closing control for outputting a valve closing signal to the gas cutoff valve 7 for a predetermined time (for example, 0.1 second) is performed (S7), and the gas cutoff valve 7 is closed. This is because the gas shut-off valve 7 is a latch-type electromagnetic valve and it is not known whether the gas shut-off valve 7 is finally open or closed. This is because a valve closing signal is output to ensure that the valve is closed.

  Then, a notification means (not shown) such as a buzzer or an indicator notifies that there is no cooking container A (S8), and current application to the electromagnet 25b in the electromagnetic safety valve 25 is stopped (S9). At this time, since the gas shut-off valve 7 is closed, the gas burner 11 is not ignited (S10). In this case, the ignition electrode may not be subjected to spark discharge without applying a voltage to the igniter.

  As a result, when the gas burner 11 is ignited, the gas shutoff valve 7 blocks the gas passage to the gas burner 11 when there is no cooking container A on the gas burner 11. Therefore, the gas burner 11 is not ignited and no raw gas is released. Therefore, it is possible to reliably avoid a dangerous event caused by a direct fire when there is no cooking container A during the ignition operation. Further, when the ignition electrode is not subjected to spark discharge, power consumption can be reduced.

  Further, by notifying that there is no cooking container (S8), the user may mistakenly assume that the gas stove 1 has failed because the gas burner 11 is not ignited even though the fire extinguishing button 3 is operated. In addition, the user can be urged to place the cooking container A on the gas burner 11 and ignite the gas burner 11. Furthermore, the application of current to the electromagnet 25b in the electromagnetic safety valve 25 is stopped (S9), thereby preventing the electromagnetic safety valve 25 from being held open.

  On the other hand, when the presence of the cooking container is detected in step S5 (“Yes” in S5), when the second-stage instrument plug manual operation position is detected by the microswitch 5 (S11), the gas cutoff valve 7 and the gas A valve opening control is performed to output a valve opening signal to the opening / closing valve 61 of the quantity adjusting valve 6 for a predetermined time (for example, 0.1 second) (S12), and the gas cutoff valve 7 and the opening / closing valve 61 are opened. Since the open / close valve 61 of the gas amount adjusting valve 6 is also a latch type solenoid valve and it is not known whether it is finally open or closed, it can be opened and closed from the ignition control means 81 regardless of whether the open / close valve 61 is open or closed. This is because a valve opening signal is output to the valve 61 so that the valve 61 is reliably opened.

  Subsequently, a voltage is applied to the igniter (S13) to cause a spark discharge from the ignition electrode, and when the electromagnetic safety valve 25 is opened by further pressing of the fire extinguishing button 3 (S14), the gas burner 11 is ignited. When the pressing of the point fire extinguishing button 3 is released (S15), the application of voltage to the igniter is stopped (S16). When the pushing of the point fire button 3 is released, the point fire button 3 is held at the holding position, the original gas valve 24 and the electromagnetic safety valve 25 of the appliance plug 2 are opened and held, and the on-off valve 61 of the gas amount adjusting valve 6 is opened. Since the gas shut-off valve 7 is held open, the gas burner 11 continues to burn (S17).

  In addition, even if the ignition operation by the above-mentioned fire extinguishing button 3 is started, when the pushing of the fire extinguishing button 3 is interrupted and each contact of the micro switch 5 is not turned on, the ignition operation is finished (S18). .

  Next, the operation release operation of the cooking container detection function will be described. Referring to the flowchart of FIG. 9, before the manual ignition operation is performed by the fire extinguishing button 3, when the release key 9 is pressed, the power is turned on (S21, S22), and the control unit 8 (control circuit 80) is activated to control the control circuit. An operation release of the cooking container detection function is accepted by the release setting unit 80 (S23). Thereby, the operation of the cooking container detection function in the ignition control unit described above is canceled. Then, within a certain period of time (for example, 10 seconds) after the release key 9 is pressed (“No” in S24), if the ignition button 3 is pressed and a manual ignition operation is performed (S25), the above-described cooking container detection is performed. Since the function is deactivated, the gas burner 11 is ignited and combustion is continued regardless of the presence or absence of the cooking container A on the gas burner 11 (S26, S27).

  On the other hand, after the release key 9 is pressed, if a certain time has passed without manual ignition operation by the point fire extinguishing button 3 (“Yes” in S24), the power is turned off and the control unit 8 (control circuit 80) is started and stopped. Then, the operation cancellation of the cooking container detection function in the cancellation setting unit of the control circuit 80 is canceled (S28). As a result, the cooking container detection function in the ignition control unit of the control circuit 80 becomes effective. As described above, if there is no cooking container A on the gas burner 11, the gas burner 11 is not ignited even if a manual ignition operation is performed.

  In this way, by turning on the release key 9, it is possible to accept the release of the cooking container detection function before performing the manual ignition operation with the fire extinguishing button 3. Accordingly, the gas burner 11 can be ignited and burned without the cooking vessel A being placed on the gas burner 11 at the user's intention, and the gas burner 11 can be burned even if there is no cooking vessel A from the beginning of ignition, and paste, etc. Can be cooked. Therefore, the convenience of the user is not limited with the above-described cooking container detection function.

  On the other hand, if the operation of the cooking container detection function can be canceled before the manual ignition operation and the operation of the cooking container detection function is always canceled if the release key 9 is turned on, the user cancels the cooking container detection function. It can happen that manual ignition is performed without the cooking container. Then, in spite of having the cooking container detection function, the gas burner 11 is ignited and burned when the manual ignition operation is performed without awareness of the release of the cooking container and without the cooking container. Hazardous events can occur due to direct fire in On the other hand, according to the release function of the present embodiment, the operation cancellation of the cooking container detection function is effective only within a certain time (for example, 10 seconds) before the manual ignition operation (S24 in FIG. 9). Forgetting that the container detection function is canceled and manual ignition operation without a cooking container is prevented. At the same time, the user recognizes the release of the cooking container detection function and manually ignites the gas burner 11 without the cooking container. Therefore, even if the release key 9 is provided, safety can be ensured.

Next, during the combustion of the gas burner 11, the following operation control is performed by the thermal power control unit. Referring to the flowchart of FIG. 10, during combustion of gas burner 11, the presence or absence of cooking container A is monitored by cooking container detection means 15 (S31). When the cooking container A is retreated from the gas burner 11 and it is detected that there is no cooking container (“No” in S32), the on-off valve 61 of the gas amount adjusting valve 6 is closed (S33). Then, as a result of the gas flowing through only the orifice passage 62 in the gas amount adjusting valve 6 and the gas supply amount being reduced, the heating power of the gas burner 11 becomes small regardless of the heating power setting of the heating power control lever 4 (S34). Thereby, even during combustion of the gas burner 11, it is possible to avoid a dangerous event caused by a direct fire of a large fire without a cooking container, and it is possible to improve safety. In addition, when the cooking container A is temporarily lifted by, for example, shaking the pan while the gas burner is being burned, the fire is merely extinguished and the fire is not extinguished.

  And if the state without a cooking container continues for a predetermined time (for example, 1 minute) after making the thermal power of the gas burner 11 small fire ("Yes" in S35), the valve opening holding current to the electromagnetic safety valve 25 of the appliance plug 2 (S36), the electromagnetic safety valve 25 is closed, and the gas burner 11 is extinguished (S37). This prevents the combustion state of the gas burner 11 from being left without a cooking container. Therefore, it is possible to improve safety by avoiding a dangerous event caused by direct fire when there is no cooking container, and it is possible to prevent wasteful consumption of fuel gas. On the other hand, when the cooking container A is arranged on the gas burner 11 within the predetermined time and the presence of the cooking container is detected (“No” in S35), the gas amount adjusting valve 6 is opened to cancel the throttle control (S38). ).

In addition, this invention is not limited to the said embodiment, A various change can be given within the scope of the present invention.
For example, in the above embodiment, the gas cutoff valve 7 is provided, and when the cooking container A is not present in the cooking container detection function, the gas cutoff valve 7 is closed and the gas burner 11 is not ignited (S5 in FIG. 8). S10) When the gas shut-off valve 7 is not provided and there is no cooking container A in the cooking container detection function, immediately after the gas burner 11 is ignited, the on-off valve 61 of the gas amount adjusting valve 6 is closed to make a small fire, and then a predetermined time has elapsed. The electromagnetic safety valve 25 may be closed and fire extinguished later, or the electromagnetic safety valve 25 may be closed and extinguished immediately after the gas burner 11 is ignited.

  Further, at the time of ignition operation, when the cooking vessel A is present, the timing of opening the on-off valve 61 of the gas shut-off valve 7 or the gas amount adjusting valve 6 (S12 in FIG. 8) is after the electromagnetic safety valve 25 is opened. You may control as follows. Thus, even when the gas pressure in the gas passage between the electromagnetic safety valve 25 and the gas shut-off valve 7 is in a high pressure state, when the gas shut-off valve 7 is controlled to open, the electromagnetic safety valve 25 is already opened and the gas passage The internal gas pressure is reduced to a normal pressure equivalent to the pressure in the gas pipe upstream of the electromagnetic safety valve 25. Therefore, when the gas shut-off valve 7 is controlled to open, strong gas pressure does not act in the valve closing direction of the gas shut-off valve 7 and the valve is smoothly opened, and the gas burner 11 can be reliably ignited.

Further, the gas amount adjusting valve 6 is provided at the downstream position of the instrument plug 2, but may be provided at the downstream position of the original gas valve 24 in the instrument plug 2.
The on / off valve 61 of the gas shut-off valve 7 and the gas amount adjusting valve 6 may be a motor valve that is opened and closed by motor driving instead of the latch type electromagnetic valve. Since this motor valve does not require holding power for holding the valve closed or holding the valve as in the case of the latch type electromagnetic valve, it is possible to suppress power consumption.
Further, as the manual on-off valve, the electromagnetic safety valve 25 may be eliminated and only the original gas valve 24 may be configured. In this case, the gas cutoff valve 7 may be closed when the gas burner 11 is misfired.
Moreover, the point-extinguishing button 3 is not limited to a push-in type, and may be a rotary type.

1 Gas stove 2 Instrument plug 3 Point fire button 5 Micro switch (position detection means)
6 Gas amount adjusting valve 7 Gas shut-off valve 8 Control unit 9 Release key 11 Gas burner 15 Cooking container detection means 24 Original gas valve 25 Electromagnetic safety valve 61 On-off valve 62 Orifice passage 80 Control circuit A Cooking container

Claims (3)

A gas stove configured to manually turn on a fire extinguisher button installed on the stove body so that the manual opening / closing valve of the appliance plug is opened and gas is supplied to the gas burner, and the control unit is turned on.
A cooking container detection means for detecting the presence or absence of a cooking container on the gas burner is provided,
The control unit includes a cooking container detection function for preventing heating of the gas burner when the cooking container detection means detects that the cooking container is absent when a manual ignition operation is performed with a point fire extinguishing button, and a cooking container detection means during combustion of the gas burner. When the absence of a cooking container is detected, it has a thermal power control function that reduces the thermal power of the gas burner to a small fire, and a release function that releases the cooking container detection function when the release key provided on the stove body is turned on,
The control unit has a control function in which the release function of the controller is canceled when the manual ignition operation is not performed within a predetermined time after the release key is turned on. The gas stove according to claim 1, wherein
The above-mentioned control unit has a heating power control function in which the gas burner is controlled to extinguish the gas burner when the state of no cooking container is continued for a predetermined time after the heating power of the gas burner is reduced. The gas stove according to claim 1 or 2,
A gas amount adjusting valve is provided between the instrument plug and the gas burner,
The gas amount adjusting valve is provided with an on-off valve and an orifice passage with a narrow gas passage provided in parallel,
A gas stove having a control structure in which the heating power control mechanism of the control unit controls the opening and closing of the on-off valve so that the gas is circulated only through the orifice passage to reduce the heating power of the gas burner.

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