JP3120137B2 - Cooker safety 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 safety device for a cooking appliance such as a gas table provided with a safety valve in a gas cock.

[0002]

2. Description of the Related Art Conventionally, as a safety device for a cooking device of this kind, there is one as shown in FIG. For example, this is an example of a circuit used for a gas table GT-705 manufactured by Matsushita Electric Industrial Co., Ltd. (catalog number G109). Hereinafter, the configuration will be described with reference to FIG.

FIG. 11 is an electric circuit diagram of a conventional safety device for a cooking appliance. In FIG. 11, reference numeral 1 denotes first opening / closing means;
Reference numeral 2 denotes a first thermocouple for supplying power for holding the safety valve open, 3 denotes a safety valve for opening and closing the valve using electromagnetic force, 4 denotes a power source such as a battery, 5 denotes a control device, 6 denotes ignition means, and 7 denotes ignition means. Burner.

When the ignition push button is pressed, the first opening / closing means 1 is closed, and current flows through the control means 5 to the first thermocouple 2 and the safety valve 3. This current allows the safety valve 3 to be forcibly attracted by the electromagnetic force without the current from the first thermocouple 2. At the same time, a signal is sent to the ignition means 6 to perform an ignition operation. When ignition is performed by the ignition means 6, the temperature near the burner 7 rises. Normally, the first thermocouple 2 is installed near the burner 7, so that the flame after the ignition generates a thermoelectromotive force.
The generated thermo-electromotive force can be self-adsorbed by flowing through the safety valve 3 without the current from the power supply 4.
Can be kept open. When the flame of the burner 7 disappears, the thermoelectromotive force of the first thermocouple 2 also decreases, and the safety valve cannot maintain the open state due to the absence of the open holding current, and is closed.

[0005]

However, in the above-described safety device, the same current as the current flowing to the safety valve 3 at the start of the ignition operation flows to the first thermocouple 2. For this reason, about twice the current is required. For example, when the battery is driven by a battery, the number of uses cannot be increased much.

The present invention solves such a conventional problem. When the ignition is ignited, the holding current of the first thermocouple 2 and the safety valve 3 can be supplied. It is better to form A first object of the present invention is to form a circuit that closes when the periphery of the first thermocouple 2 is sufficiently heated after the end of ignition, and to complete the operation of the safety valve 3 early.

In addition, the end of ignition is often determined by external influences. In this case, the time until ignition is varied. Therefore, the opening of the safety valve 3 cannot be maintained unless the ignition is reliably detected. A second object of the present invention is to provide a second thermocouple so that ignition detection can be made more reliable, and then the first thermocouple 2 circuit is closed to ensure that the safety valve 3 is kept open. It is to make.

Further, if the ignition end is not surely grasped,
For example, when a hot pot or the like is placed, it is difficult to detect ignition only by the temperature. A third object of the present invention is to detect a flame based on information other than heat to more reliably detect ignition and then perform a closing operation of the first thermocouple 2 circuit,
An object of the present invention is to ensure that the opening and holding operation of the safety valve 3 is ensured.

Further, the ignition time may change due to external influences. In this case, there has been a case where the ignition operation is performed even though the fuel is already ignited and burned. The present invention
A fourth object is to perform an efficient ignition operation by stopping the ignition operation after detecting the ignition by the temperature detecting means.

Furthermore, when the outside air temperature is low, ignition is often difficult, so the ignition operation must be lengthened, and the ignition operation may be repeated. A fifth object of the present invention is to reliably perform ignition by detecting the outside air temperature and adjusting the ignition operation time according to the detected value.

Further, the combustion gas does not reach the vicinity of the burner 7 immediately after the safety valve 3 is opened. The time was indefinite depending on the pipe shape and length, and it was not possible to determine when to start the ignition operation. A sixth object of the present invention is to perform ignition with certainty and effective use of electric power by performing a ignition operation by detecting a change in the temperature of the blown combustion gas by a temperature detection means installed near the burner 7 and then performing an ignition operation. Make it possible.

Further, the opening time of the flow control valve provided after the safety valve 3 changes the time for pushing out the air staying inside the mixing pipe and for the combustion gas to reach the burner 7. For this reason, the combustion gas may not yet reach even when the ignition operation has ended. The present invention
The purpose of 7 is to reliably perform ignition by detecting the valve opening of the flow control valve and adjusting the ignition operation time based on the detected value.

[0013]

In order to achieve the first object, a safety device of the present invention comprises a safety valve for opening and closing a valve using an electromagnetic force in a gas cock, and a power supply for holding the safety valve open. A first thermocouple to be supplied, first opening / closing means for opening / closing a power supply circuit at the time of ignition, second opening / closing means for opening / closing the circuit in the first thermocouple circuit by temperature, and ignition means for igniting a burner And control means for controlling the ignition means, and a power supply.

In order to achieve the second object, a safety device of the present invention comprises a safety valve for opening and closing a valve using an electromagnetic force in a gas cock, and a first thermoelectric device for supplying power for holding the safety valve open. A pair, first opening / closing means for opening / closing the power supply circuit at the time of ignition, and a second opening / closing means for opening / closing the first thermocouple circuit.
Opening / closing means, a second thermocouple for detecting the start of combustion, control means for controlling opening / closing of the second opening / closing means by an output of the second thermocouple, and a power supply. is there.

In order to achieve a third object, a safety device of the present invention comprises a safety valve for opening and closing a valve using an electromagnetic force in a gas cock, and a first thermoelectric device for supplying power for holding the safety valve open. A pair, first opening / closing means for opening / closing the power supply circuit at the time of ignition, and a second opening / closing means for opening / closing the first thermocouple circuit.
, A flame detecting means for detecting the start of combustion, a control means for controlling the opening and closing of the second opening and closing means by an output of the flame detecting means, and a power supply.

In order to achieve the fourth object, a safety device of the present invention comprises a safety valve for opening and closing a valve using an electromagnetic force in a gas cock, and a first thermoelectric device for supplying power for holding the safety valve open. A pair, first opening / closing means for opening / closing a power supply circuit at the time of ignition, ignition means for igniting a burner, control means for controlling the ignition means, a power supply, and a second thermocouple for detecting the start of combustion. The control means sends a signal to the ignition means in response to the output of the second thermocouple after the first opening / closing means has closed.

In order to achieve the fifth object, a safety device of the present invention comprises a safety valve for opening and closing a valve using an electromagnetic force in a gas cock, and a first thermoelectric device for supplying power for holding the safety valve open. A pair of first opening / closing means for opening / closing a power supply circuit at the time of ignition, ignition means for igniting a burner, control means for controlling the ignition means, a power supply, and temperature detection means for detecting a temperature; The control means sends a signal to the ignition means in response to the output of the temperature detection means after the first opening / closing means has closed.

In order to achieve the sixth object, a safety device of the present invention comprises a safety valve for opening and closing a valve using an electromagnetic force in a gas cock, and a first thermoelectric device for supplying power for holding the safety valve open. A pair, first opening / closing means for opening and closing a power supply circuit at the time of ignition, ignition means for igniting a burner, control means for controlling the ignition means, a power supply, and temperature detecting means provided near a burner outlet. The control means sends a signal to the ignition means in response to the output of the temperature detection means after the first opening / closing means is closed.

In order to achieve the seventh object, a safety device of the present invention comprises a safety valve for opening and closing a valve using an electromagnetic force in a gas cock, and a first thermoelectric device for supplying power for holding the safety valve open. A pair, a flow control valve for adjusting a flow rate downstream of the safety valve, an opening detection means for detecting a valve opening of the flow control valve, a first opening and closing means for opening and closing a power supply circuit at the time of ignition, and a burner. An ignition means for igniting, a control means for controlling the ignition means, and a power supply, wherein the control means sends a signal to the ignition means in response to a signal from the opening degree detection means after the first opening / closing means has closed. Is sent.

[0020]

According to the present invention, the first thermocouple circuit is closed after ignition by providing an opening / closing means that opens and closes by heat near the first thermocouple, thereby improving the efficiency of the power supply.

Further, the operation of closing the first thermocouple circuit is performed after the ignition detection is more reliably performed by the second thermocouple, thereby ensuring the operation of maintaining the open state of the safety valve.

In addition, by detecting a flame based on information other than heat, the ignition operation is more reliably detected, and then the first thermocouple circuit is closed to ensure that the safety valve is kept open. It is.

Further, the ignition operation is stopped after the ignition is detected by the temperature detecting means, so that the ignition operation is reliably performed.

Further, by detecting the outside air temperature and adjusting the time for performing the ignition operation according to the detected value, the ignition is reliably performed.

Further, the temperature detecting means installed near the burner detects a change in the temperature of the blown combustion gas, and then performs an ignition operation to ignite reliably and with effective use of electric power.

Further, the ignition is reliably performed by adjusting the time for performing the ignition operation according to the opening degree of the flow control valve.

[0027]

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIG.

FIG. 1A is an electric circuit diagram of a safety device for a cooking appliance. The same parts as in FIG. 11 of the conventional example are denoted by the same reference numerals, and detailed description is omitted. In FIG. 1A, reference numeral 8 denotes second opening / closing means for opening / closing the first thermocouple circuit. FIG. 1B is a schematic sectional view of the safety device of the cooking device.

Next, the operation will be described. Normally, when the ignition operation is operated by a push button or the like in a gas table or the like, the first opening / closing means 1 forms a closed circuit, and the ignition means 6 is operated via the control means 5 and the coil part of the safety valve 3 is simultaneously operated. Apply current. As a result, current flows through the coil by the power supply 4 until the first thermocouple 2 generates a thermoelectromotive force due to the ignition of the burner 7 or the like, and the safety valve 3 is kept open. in this case,
When the first thermocouple 2 is connected to the safety valve 3, when a current flows from the power supply 4, the current flows to the first thermocouple 2. Usually, the resistance value of the first thermocouple 2 is set to a value close to the resistance value of the safety valve 3, so that the current needs to be doubled.

In this embodiment, a second opening / closing means 8 is provided between the first thermocouple 2 and the safety valve 3 in order to solve the above problem. Thus, when the ignition operation is performed, the second opening / closing means 8 is opened so that the current from the power supply 4 does not flow to the first thermocouple 2 side. When the ignition means 6 is ignited via the control means 5, a thermoelectromotive force is generated in the first thermocouple 2. After the ignition is sufficiently completed, the first thermocouple 2 and the safety valve 3 form a closed circuit by closing the second opening / closing means 8, and the safety valve 3 can be opened and held by the thermoelectromotive force generated by combustion.
In this case, the effective use of the power supply can be achieved by preventing the current from flowing from the first opening / closing means 1 to the safety valve 3 after the end of the ignition.

Embodiment 2 Next, a second embodiment of the present invention will be described with reference to FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. In FIG. 2A, reference numeral 9 denotes second opening / closing means for performing an opening / closing operation by heat. FIG. 2B is a schematic sectional view of the safety device of the cooking device.

After the ignition is completed, it is not necessary to supply a current from the power supply 4 to the safety valve 3. However, in the configuration in which the current is supplied to the first thermocouple 2, there is no method for determining whether the ignition has ended. In order to solve this problem, in the present invention, the second opening / closing means 9 that opens and closes by heat is installed near the first thermocouple 2. For example, a shape memory alloy whose shape changes by heat may be used. Thus, when the burner 7 is ignited by the ignition means 6, the first thermocouple 2 installed near the burner 7 is heated and starts to generate a thermoelectromotive force. At the same time, the second opening / closing means 9 made of a material that expands and contracts by heat closes the contact inside the second opening / closing means 9, and the thermoelectromotive force of the first thermocouple 2 flows toward the safety valve 3. As a result, the first thermocouple 2 and the safety valve 3 form a closed circuit only at the time of ignition, so that at the time of ignition, current does not flow to the first thermocouple 2 and efficient operation can be performed. When the fire is extinguished, the temperature in the vicinity of the burner 7 decreases, so the second opening / closing means 9
Can be opened automatically.

Embodiment 3 Next, a third embodiment of the present invention will be described with reference to FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. In FIG.
0 is a second opening / closing means for opening / closing the first thermocouple 2 circuit;
Reference numeral 11 denotes control means for closing the second opening / closing means at a preset time after the first opening / closing means 1 performs the closing operation.

The generation of the thermoelectromotive force in the first thermocouple 2 after the termination of the ignition does not change so much even if there is some variation. Normally, the ignition operation is performed longer for safety. During this operation, if a current is applied to the first thermocouple 2 and the safety valve 3 as in the conventional example, the power is consumed quickly.

In order to solve this problem, in the embodiment of the present invention, when the first opening / closing means 1 performs a closing operation, this is detected by the control means 11 and the second opening / closing means 1 is operated until the preset time comes.
Of the opening / closing means 10 is opened, and the current from the power supply 4
To the thermocouple 2 side. After a lapse of time during which the ignition is sufficiently completed, the control means 11 closes the second opening / closing means 10 to form a closed circuit with the first thermocouple 2 and the safety valve 3, and the safety valve 3 is activated by the thermoelectromotive force. The opening holding operation is enabled. When a closed circuit is formed, the safety valve 3 can sufficiently maintain the opening operation even when the current from the power supply 4 to the safety valve 3 stops. As a result, the ignition operation can be ended without flowing a current through the first thermocouple 2.

Embodiment 4 Next, a fourth embodiment of the present invention will be described with reference to FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. In FIG. 4A, reference numeral 12 denotes second opening / closing means for opening / closing the first thermocouple 2 circuit, 13 denotes a second thermocouple for detecting the start of combustion, and 14 denotes a second thermocouple based on a signal from the second thermocouple 13. This is control means for controlling the opening and closing of the second opening and closing means 12. FIG. 4B is a plan view near the burner.

Normally, the ignition time is often constant. In this case, since ignition is not detected, if an ignition error occurs due to disturbance or the like, the ignition operation must be performed again.

In order to solve this problem, in the embodiment of the present invention, a second thermocouple 13 is installed near the burner 7. Thus, the ignition operation is performed after the first opening / closing means 1 is closed and the safety valve 3 is forcibly sucked. At this time, the second opening / closing means 12 is opening. When the burner 7 is ignited, the second thermocouple 13 detects the temperature rise. The control means 14 closes the second opening / closing means 12 after detecting the thermoelectromotive force of the second thermocouple 13. Further, if the second thermocouple 13 is installed at a position facing the first thermocouple 2 of the burner 7, after the flame is surely covered around the burner 7 after ignition, the second thermocouple 13 is It is possible to reliably detect the ignition for the detection. Since a thermoelectromotive force is generated in the first thermocouple 2 by the ignition, the safety valve 3
Thus, the opening holding operation can be sufficiently performed without passing a current through the opening.

Embodiment 5 Next, a fifth embodiment of the present invention will be described with reference to FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. In FIG. 5A, reference numeral 15 denotes second opening / closing means for opening / closing the first thermocouple 2 circuit, 16 denotes flame detecting means for detecting flame after ignition, and 17 denotes second flame based on a signal from the flame detecting means 16. Control means for controlling the opening and closing means. FIG. 5B is a plan view near the burner 7.

If the ignition is determined based only on the normal temperature, if a frying pan or the like sufficiently heated by another stove is placed near the burner 7 on a gas table or the like, there is a possibility that the ignition may be erroneously detected.

In order to solve this problem, in the embodiment of the present invention, the termination of the ignition is determined by using the flame detecting means 16 for detecting the ignition at a temperature other than the temperature. As the flame detecting means 16, a photodiode for detecting light of a flame, an element for detecting a spectrum specific to a flame, or the like may be used. When the first opening / closing means 1 is closed, a current is supplied to the safety valve 3 and an ignition operation is performed, and the burner 7 is ignited by the ignition, the flame detection means 16 detects the flame. The control means 17 detects the occurrence of a flame in the burner 7 based on the signal of the flame detection means 16 and closes the second opening / closing means 15. First thermocouple 2 due to flame
Since sufficient thermal electromotive force has been generated, the current can be supplied to the safety valve 3, and the opening holding operation can be realized. The control means 17 closes the second opening / closing means 15 and stops the current supply from the power supply 4 to the safety valve 3. As a result, the power supply 4 does not use useless current, and can be used for a long time.

Embodiment 6 Next, a sixth embodiment of the present invention will be described with reference to FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. In FIG. 6A, reference numeral 18 denotes control means for driving the ignition means after a lapse of a predetermined time after the first opening / closing means has closed.

Normally, even if the ignition operation is performed immediately after the safety valve 3 is opened, the combustion gas has not yet reached the vicinity of the burner 7, so that the power may be wasted.

In order to solve this problem, in the embodiment of the present invention, the ignition operation is performed after a certain time has elapsed after the safety valve 3 is opened. This operation will be described with reference to a timing chart. In FIG. 6B, (1) shows the operation of the first opening / closing means 1, (2) shows the operation of the safety valve 3, and (3) shows the operation of the ignition means 6. After the first opening / closing means 1 is closed and the safety valve 3 is opened, gas flows through the safety valve 3. Even if the ignition operation is performed before the gas reaches, there is no ignition. Therefore, the control means 18 delays the operation of the ignition means 6 by a time which can be predicted in advance by the pipe length or the like, for example, Δt in FIG. 6B. This promotes effective use of electric power by eliminating waste of the ignition operation.

Embodiment 7 Next, a seventh embodiment of the present invention will be described with reference to FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. In FIG. 7A, reference numeral 19 denotes a second thermocouple for detecting the start of combustion, and reference numeral 20 denotes control means for sending a signal to the ignition means based on the output of the second thermocouple.

Normally, the ignition time may change due to external influences. For this reason, the ignition time is set longer so that there is no ignition mistake. However, if the ignition operation is performed while the ignition is on, the power wasted and the sound at the time of ignition was unpleasant.

In order to solve this problem, in the embodiment of the present invention, the signal of the second thermocouple 19 is used to detect the ignition. After the first opening / closing means 1 performs the closing operation, the control means 20 detects the state of the second thermocouple 19. At the same time, the ignition means 6 is driven to perform an ignition operation. When ignition occurs, the signal of the second thermocouple 19 changes greatly. The control means 20 detects the ignition signal and stops the signal to the ignition means 6 to stop the ignition operation. This operation will be described with reference to a timing chart. In FIG. 7B, (1) shows the operation of the first opening / closing means 1, (2) shows the operation of the ignition means 6, and (3) shows the signal of the second thermocouple 19. At t1, the ignition operation is started. The first opening / closing means 1 is opened, and the ignition means 6 is also turned on. The ignition operation is continued, and at t2, the output of the second thermocouple 19 rises, and the control means 20 recognizes that the ignition has occurred, and the ignition means 6
Stop the signal to This makes it possible to shorten the ignition time, which was set longer for safety reasons, in consideration of an ignition mistake, until the net ignition occurs, thereby saving energy of the power supply and reducing unpleasant ignition noise.

(Eighth Embodiment) Next, an eighth embodiment of the present invention will be described with reference to FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. In FIG. 8A, reference numeral 21 denotes a temperature detecting means, and 22 denotes a control means for sending a signal to the ignition means 6 according to the output of the temperature detecting means 21. FIG. 8B is a schematic sectional view of the present embodiment.

Normally, when the outside air temperature is low, ignition is often difficult, so that the ignition operation must be lengthened, and the ignition operation may be repeatedly performed.

In order to solve this problem, in the embodiment of the present invention, the outside temperature is detected by the temperature detecting means 21, and the time for performing the ignition operation is adjusted according to the detected value. For example, a sensor for detecting the temperature at the bottom of the pan of the gas table may be used as the temperature detecting means 21. The first opening / closing means 1 is closed to perform an ignition operation. At this time, the outside air temperature is detected using the temperature detecting means 21. The control means 22 sets the ignition operation time of the ignition means 6 based on the outside air temperature. For example, when the outside air temperature is low, it is difficult to ignite because the mixing ratio of gas and air is different, so that the ignition time is set longer. Conversely, when the outside air temperature is high, the ignition time is shortened because ignition is easy.
By performing this operation, ignition can be reliably performed.

Embodiment 9 Next, a ninth embodiment of the present invention will be described with reference to FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. In FIG. 9A, reference numeral 23 denotes temperature detecting means for detecting the temperature near the burner 7; and 24, control means for sending a signal to the ignition means 6 based on the output of the temperature detecting means 23.

Normally, immediately after the safety valve 3 is opened, the burner 7
Combustion gas does not reach the vicinity. The time was indefinite depending on the pipe shape and length, and it was not possible to determine when to start the ignition operation.

In order to solve this problem, in the embodiment of the present invention, the temperature detecting means 23 installed near the burner 7 detects a change in the temperature of the blown out combustion gas, and then performs the ignition operation.

For example, when the gas that has passed through the safety valve 3 blows out from the nozzle, the pressure rapidly changes and the temperature drops. When the low-temperature gas reaches the vicinity of the burner 7, the temperature detecting means 23 detects the low temperature and the output changes. The control means 24 catches the signal change of the temperature detection means 23, knows that the gas has reached the vicinity of the burner 7, sends a signal to the ignition means 6, and starts the ignition operation. This operation will be described with reference to a timing chart. In FIG. 9B, (1) shows the operation of the first opening / closing means 1, (2) shows the detection signal of the temperature detecting means 23, and (3) shows the operation of the ignition means 6. . When the first opening / closing means 1 is opened for ignition at t1, gas reaches the vicinity of the burner 7 at time t2 after a while, and the signal of the temperature detecting means 23 changes. The control means 24 detects this change and sends a signal to ignite the ignition means 6. Since the ignition means 6 is driven after the ignition becomes possible by this operation, it is possible to reliably ignite without wasting the power supply 4.

Embodiment 10 Next, a tenth embodiment of the present invention will be described with reference to FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. FIG.
In (a), 25 is a flow control valve, 26 is an opening detection means for detecting the valve opening of the flow control valve 25, and 27 is a control means for sending a signal to the ignition means 6 based on the output of the opening detection means 26. is there.

Normally, the flow control valve 2 provided after the safety valve 3
Due to the opening degree of 5, the time that the air remaining inside the mixing pipe is pushed out and the combustion gas reaches the burner 7 has changed. For example, when the flow rate was reduced, the gas flow rate was small, so that the gas could not easily reach the burner 7.
For this reason, there has been a case where the gas has not yet reached even when the ignition operation is performed.

In order to solve this problem, in the embodiment of the present invention, the opening degree of the flow control valve 25 is detected by the opening degree detecting means 26, and the control means 27 adjusts the time for performing the ignition operation based on the detected value. . Referring to FIG. 10B, when the gas flow rate is reduced, it takes time for the gas to reach the burner 7. For this reason, the ignition time is lengthened so as to ensure ignition. Conversely, when the ignition operation is performed with a large flow rate for high calorie combustion, the gas reaches the burner 7 quickly. In this case, since the ignition is easy, the ignition time may be short. The control means 27 estimates this time from the value of the opening degree detection means 26 and sets it. Also, by having a memory function, it is possible to learn the relationship between the valve opening degree and the ignition time, and to gradually become smarter.

[0058]

As described above, according to the cooking device safety device of the present invention, the following effects can be obtained.

( 1 ) A second opening / closing means that opens and closes by heat is installed near the first thermocouple, and the second opening / closing means is opened when the burner is ignited.
The opening and closing means has a structure in which a contact is closed by heat and the thermoelectromotive force of the first thermocouple flows to the safety valve. As a result, the first thermocouple and the safety valve self-form a closed circuit only at the time of ignition, so that at the time of ignition, current flows only to the safety valve and efficient operation can be performed.

( 2 ) When the burner is ignited, the second thermocouple near the burner detects the temperature rise, and then the second opening / closing means is closed via the control means to reliably detect the ignition. It becomes possible. Since the first thermocouple generates thermoelectromotive force due to the ignition, the first switching means 1
Therefore, the opening holding operation can be sufficiently performed without passing a current to the safety valve 3.

( 3 ) When the burner is ignited, the flame is detected by the flame detecting means, and the second opening / closing means is closed via the control means. Since the first thermocouple generates sufficient thermoelectromotive force due to the flame, it is possible to supply a current to the safety valve and realize the opening and holding operation. Since the flame is detected directly instead of judging the ignition only by the temperature, erroneous detection of the ignition is eliminated and the termination of the ignition can be determined with certainty. The second opening / closing means is closed and the current supply from the power supply to the safety valve is stopped. The power supply does not use useless current and can be used for a long time.

( 4 ) When the signal of the second thermocouple for detecting ignition greatly changes, the control means detects this signal, stops the signal to the ignition means, and stops the ignition operation. This makes it possible to shorten the ignition time, which was set longer for safety reasons, in consideration of an ignition mistake, until the net ignition occurs, thereby saving energy of the power supply and reducing unpleasant ignition noise.

( 5 ) It is possible to reliably perform ignition by detecting the outside air temperature by the temperature detecting means and flexibly adjusting the ignition operation time based on the detected value.

( 6 ) The temperature detecting means installed near the burner detects a change in the temperature of the blown combustion gas, and the ignition means is driven after the ignition is enabled in order to perform the ignition operation. As a result, it is possible to reliably perform ignition without wasting power.

( 7 ) The opening of the flow control valve is detected by the opening detecting means, and the control means adjusts the time for performing the ignition operation based on the detected value. As a result, the ignition operation is performed after the time that the combustion gas reaches the burner is pushed out by pushing out the air that has accumulated between the safety valve and the burner, and the ignition can be reliably performed.

[Brief description of the drawings]

FIG. 1 (a) is an electric circuit diagram of a cooker safety device according to a first embodiment of the present invention. FIG. 1 (b) is a schematic sectional view of the cooker safety device.

FIG. 2A is an electric circuit diagram of a cooker safety device according to a second embodiment of the present invention; FIG. 2B is a schematic sectional view of the cooker safety device;

FIG. 3 is an electric circuit diagram of a safety device for a cooking appliance according to a third embodiment of the present invention.

FIG. 4 (a) is an electric circuit diagram of a cooker safety device according to a fourth embodiment of the present invention. FIG. 4 (b) is a plan view of the cooker safety device near a burner.

FIG. 5 (a) is an electric circuit diagram of a cooking device safety device according to a fifth embodiment of the present invention. FIG. 5 (b) is a plan view of the cooking device safety device near a burner.

FIG. 6 (a) is an electric circuit diagram of a cooking device safety device according to a sixth embodiment of the present invention; FIG. 6 (b) is a timing waveform diagram of the cooking device safety device;

FIG. 7A is an electric circuit diagram of a cooking device safety device according to a seventh embodiment of the present invention. FIG. 7B is a timing waveform diagram of the cooking device safety device.

FIG. 8 (a) is an electric circuit diagram of a cooker safety device according to an eighth embodiment of the present invention. FIG. 8 (b) is a schematic sectional view of the cooker safety device.

FIG. 9A is a schematic cross-sectional view of a cooking device safety device according to a ninth embodiment of the present invention. FIG. 9B is a timing waveform diagram of the cooking device safety device.

10A is a schematic sectional view of a safety device for a cooking appliance according to a tenth embodiment of the present invention, and FIG. 10B is an ignition time characteristic diagram of the safety device for the cooking appliance.

FIG. 11 is an electric circuit diagram of a conventional safety device for a cooking appliance.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st opening / closing means 2 1st thermocouple 3 Safety valve 4 Power supply 5,11,14,17,18,20,22,24,27
Control means 6 Ignition means 7 Burner 8, 9, 10, 12, 15 Second opening / closing means 13, 19 Second thermocouple 16 Flame detecting means 21, 23 Temperature detecting means 25 Flow control valve 26 Opening detecting means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F23N 5/10 330 F24C 3/12

Claims (7)

(57) [Claims] 1. A safety valve for opening and closing a valve using an electromagnetic force in a gas cock, a first thermocouple for supplying power for holding the safety valve open, and first opening and closing means for opening and closing a power supply circuit at the time of ignition. Temperature in the first thermocouple circuit .
A second opening / closing means for opening and closing the circuit, an ignition means for igniting a burner, a control means for controlling the ignition means, and a power supply. 2. A safety valve for opening and closing a valve using an electromagnetic force in a gas cock, a first thermocouple for supplying power for holding the safety valve open, and first opening and closing means for opening and closing a power supply circuit at the time of ignition. , Which opens and closes the first thermocouple circuit
Opening / closing means, a second thermocouple for detecting the start of combustion,
Opening and closing the second opening / closing means by the output of the second thermocouple;
A safety device for a cooker, comprising a control means for controlling the operation and a power supply. 3. A safety valve for opening and closing a valve using an electromagnetic force in a gas cock, a first thermocouple for supplying power for holding the safety valve open, and first opening and closing means for opening and closing a power supply circuit at the time of ignition. , Which opens and closes the first thermocouple circuit
Opening and closing means, flame detection means for detecting the start of combustion,
The opening and closing of the second opening and closing means is controlled by the output of the flame detecting means.
And control means for control, safety device cooker comprising a power source. 4. A safety valve for opening and closing a valve using an electromagnetic force in a gas cock, a first thermocouple for supplying power for holding the safety valve open, and first opening and closing means for opening and closing a power supply circuit at the time of ignition. Ignition means for igniting a burner;
The control means for controlling the ignition means , the power supply, and the start of combustion are detected.
A second thermocouple to be known.
After the first opening / closing means is closed , the output of the second thermocouple is
A safety device for a cooking appliance configured to send a signal to the ignition means in response . 5. A safety valve for opening and closing a valve using an electromagnetic force in a gas cock, a first thermocouple for supplying power for holding the safety valve open, and first opening and closing means for opening and closing a power supply circuit at the time of ignition. Ignition means for igniting a burner;
Control means for controlling the ignition means , a power supply, and temperature detection
Temperature control means, wherein the control means comprises
After the opening / closing means closes, according to the output of the temperature detecting means
It sends a signal to the point fire means Te configuration as the cooker safety device. 6. A safety valve for opening and closing a valve using an electromagnetic force in a gas cock, a first thermocouple for supplying power for maintaining the opening and closing of the safety valve, and first opening and closing means for opening and closing a power supply circuit at the time of ignition. , Ignition means for igniting a burner, control means for controlling the ignition means, a power supply, and a burner outlet
Consists of a temperature detector installed in the near, the control means out of said temperature detecting means after said first switching means is sealed closed
A safety device for a cooker configured to send a signal to the ignition means according to a force . 7. A safety valve that opens and closes a valve using an electromagnetic force in a gas cock, a first thermocouple that supplies power to keep the safety valve open, and a flow downstream of the safety valve.
A flow control valve for adjusting the flow rate, and a valve opening of the flow control valve.
Openness detection means to detect and open / close the power supply circuit at ignition
A first opening / closing means; an ignition means for igniting a burner; a control means for controlling the ignition means; and a power supply, wherein the control means detects an opening after the first opening / closing means closes.
A cooker safety device configured to send a signal to the ignition means in response to a signal from the means .