JP2024000785A - Combustion apparatus and heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion apparatus and a heating cooker capable of preventing the discharge of gas causing uncomfortable feeling and uneasiness to users, even if heating power adjustment control operation is carried out by using a latch type solenoid valve.

SOLUTION: A combustion apparatus 1 is equipped with a burner 3, a gas supply path 4 that supplies fuel gas to the burner 3, a latch type solenoid valve 5 that opens/closes the gas supply path 4, and a control portion 6 that instructs valve-opening or valve-closing of the latch type solenoid valve 5. The control portion 6 gives a continuous valve-closing instruction which instructs the latch type solenoid valve 5 to close valve repeatedly under a predetermined condition after the valve closing instruction of the latch type solenoid valve 5, when performing heating-power regulating control operation which alternately repeats a combustion process in which the latch type solenoid valve 5 is opened by a valve opening instruction to burn the burner 3 and an extinction process in which the latch type solenoid valve 5 is closed by a valve closing instruction to extinguish the burner 3.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2024,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a combustion device and a cooking device that are capable of performing a fire power adjustment control operation that alternately repeats a combustion process and an extinguishing process.

For example, Patent Document 1 discloses that in a grill device, a fire power adjustment control operation is performed in which combustion in a burner is temporarily extinguished and the internal temperature is kept within a certain range by repeating a combustion process and an extinguishing process. ing. Here, in general, switching between the combustion process and the extinguishing process in the above-mentioned thermal power adjustment control operation uses an on-off valve that can reliably maintain the open and closed states, such as an electric valve.

Japanese Patent Application Publication No. 2020-62104

By the way, a latch-type solenoid valve that uses a permanent magnet and an electromagnetic coil is known as a means for adjusting the thermal power of a burner. In a latch-type solenoid valve, a valve drive voltage is applied to the solenoid coil for the required time as an instruction to open or close the valve, causing the valve to open or close, and then the valve state is maintained by the action of a permanent magnet or spring. . After carefully considering a configuration that uses this latching type solenoid valve to switch between the combustion process and the extinguishing process in the thermal power adjustment control operation, we found that during the extinguishing process after the latch type solenoid valve is instructed to close, external noise etc. Therefore, if the latch type solenoid valve opens due to an abnormality such as malfunction of the microcomputer or circuit, gas continues to be released from the burner. If the gas release state continues for a long time, the gas smell caused by the gas release and the stagnant gas will be ignited when the combustion process starts again, causing combustion accompanied by loud noises, causing discomfort and anxiety to the user. There is a risk of giving.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent the release of gas that would cause a user to feel discomfort or anxiety even when the thermal power adjustment control operation is performed using a latch type solenoid valve. The purpose of the present invention is to provide a combustion device and a heating cooker that enable this.

The combustion device of invention 1 is
Burna and
a gas supply path that supplies fuel gas to the burner;
a latch type solenoid valve that opens and closes the gas supply path;
a control unit that instructs the latch type solenoid valve to open or close;
The control unit performs a combustion process in which the latching type solenoid valve is opened in response to an opening instruction to cause the burner to burn, and a fire extinguishing process in which the latching type solenoid valve is closed in response to a valve closing instruction to extinguish the burner. When carrying out a thermal power adjustment control operation that alternately repeats the above, the present invention includes a control configuration for sequentially instructing the latch-type solenoid valve to close under predetermined conditions after instructing the latch-type solenoid valve to close.

With the above configuration, during the fire extinguishing step executed by the closing instruction of the latching type solenoid valve in the thermal power adjustment control operation, a continuous valve closing instruction is given to the latching type solenoid valve to superimpose the valve closing instruction. As a result, even if the latching type solenoid valve opens due to some abnormality during the fire extinguishing process, the latching type solenoid valve can be closed and the gas supply path can be shut off by a continuous valve closing instruction and another valve closing instruction. can. Therefore, it is possible to stop the release of gas from the burner that causes discomfort and uneasiness to the user, such as gas odor and combustion accompanied by loud noise upon ignition when restarting the combustion process. Therefore, when performing a fire power adjustment control operation that alternately repeats the combustion process and extinguishing process using the latch type solenoid valve, the user can use the combustion device with confidence without feeling discomfort or anxiety due to gas discharge from the burner. It becomes possible to make it possible. Note that the predetermined condition may be a case where a condition for starting the extinguishing process is satisfied, a case where the start of the extinguishing process is confirmed, or the like.

The combustion device of invention 2 is
In the combustion device according to invention 1,
comprising flame detection means for detecting combustion flame of the burner,
The control unit may be configured to issue a valve closing instruction to the latch type electromagnetic valve as the continuous valve closing instruction when the flame detection means, which is the predetermined condition, detects extinguishing of the burner.

With the above configuration, the control unit can grasp the health (normal operation) of the latch type solenoid valve at that time by confirming that the burner is extinguished using the flame detection means. Therefore, the latch type solenoid valve can be normally closed by a valve closing instruction from the control section. Additionally, the start of the extinguishing process can be recognized by confirming that the burner is extinguished. Therefore, by detecting extinguishing of the burner with the flame detection means and determining that the extinguishment has been confirmed as a case where a predetermined condition is satisfied, it is possible to reliably issue a continuous valve closing instruction during the extinguishing process. Therefore, even if the latch type solenoid valve opens due to malfunction etc. during the extinguishing process, the latch type solenoid valve will be closed by continuous valve closing instructions, and gas from the burner that may cause discomfort or anxiety to the user will be prevented. emission can be stopped.

The combustion device of invention 3 is
In the combustion device according to invention 1,
It has a temperature detection means for detecting the temperature of the combustion space and/or the heated object,
The control unit may be configured to issue a valve closing instruction to the latch type electromagnetic valve as the continuous valve closing instruction when the temperature detection means detects predetermined temperature information that is the predetermined condition.

Here, the temperature of the combustion space includes the temperature of various spaces in which burners are disposed. The temperature of the object to be heated includes the temperature of the cooking utensil heated by the burner, the temperature of the food stored in the cooking utensil, and the like. The temperature information includes temperature values, temperature gradients, temperature changes, and the like.
With the above configuration, the control unit can confirm that the burner is extinguished by detecting predetermined temperature information with the temperature detection means, so it is possible to grasp the health (normal operation) of the latch type solenoid valve at that point. becomes. Therefore, the latch type solenoid valve can be normally closed by a valve closing instruction from the control section. Additionally, the start of the extinguishing process can be recognized by confirming that the burner is extinguished. Therefore, by detecting predetermined temperature information with the temperature detection means and confirming that the burner is extinguished, the predetermined condition is satisfied, so that continuous valve closing instructions can be reliably issued during the extinguishing process. Therefore, even if the latch type solenoid valve opens due to malfunction etc. during the extinguishing process, the latch type solenoid valve will be closed by continuous valve closing instructions, and gas from the burner that may cause discomfort or anxiety to the user will be prevented. emission can be stopped.

The combustion device of invention 4 is
In the combustion device according to any one of inventions 1 to 3,
The control unit may be configured to issue a valve closing instruction to the latch type solenoid valve every predetermined period of time as the continuous valve closing instruction.

With the above configuration, the elapsed time of the predetermined time is set to be shorter than the amount of gas released from the burner that causes the user to smell the gas or cause combustion with loud noise when ignited. By issuing continuous valve closing instructions during this cycle time, even if the latching type solenoid valve opens due to malfunction during the extinguishing process, the latching type solenoid valve will be closed, cutting off the gas supply path and removing the gas from the burner. It becomes possible to suppress the release of gas to a range that does not cause discomfort or anxiety to the user.

The combustion device of invention 5 is
In the combustion device according to any one of inventions 1 to 4,
The control unit may be configured to interrupt the continuous valve closing instruction after instructing the latch type electromagnetic valve to open.

With the above configuration, the combustion process is executed after the latch-type solenoid valve is instructed to open. Therefore, by interrupting the continuous valve-closing instruction during the combustion process, the latch-type solenoid valve closes during the combustion process. It becomes possible to carry out the normal combustion process without the burner being extinguished.

The combustion device of invention 6 is
In the combustion device according to any one of inventions 1 to 5,
A plurality of burners are provided,
The gas supply path is branched to supply fuel gas to each of the burners,
The latch type solenoid valve is provided in each of the branched gas supply paths,
The control unit may have a control configuration capable of instructing the latch-type solenoid valve to open, close, and continuously close the latched electromagnetic valve for each burner individually.

With the above configuration, when a predetermined combustion space is formed by all or part of a plurality of burners, and a latching type solenoid valve is used to perform a fire power adjustment control operation in this combustion space, the latching type solenoid valve is activated during the extinguishing process. Even if the valve is opened due to malfunction or the like, by shutting off the gas supply path by issuing a continuous valve closing instruction, it is possible to stop the release of gas from the burner that would cause the user to feel uncomfortable or anxious.

The combustion device of invention 7 is
The heating cooker may include the combustion device according to any one of inventions 1 to 6 above.

For example, when using a latch-type solenoid valve to control the firepower in a cooking device such as a grill or a gas stove, even if the latch-type solenoid valve opens due to malfunction during the extinguishing process, it will continue to close the valve. By blocking the gas supply path, it is possible to stop the release of gas from the burner that would cause the user to feel uncomfortable or anxious.

It is a schematic diagram showing a grill device of an embodiment. FIG. 3 is a cross-sectional view showing a latch type solenoid valve in an open state and a closed state. It is a time chart for explaining the operation when a latch type solenoid valve is used when executing the combustion process and the extinguishing process in the thermal power adjustment control operation. It is a flow chart which shows operation of a control part which performs thermal power adjustment control operation in a grill device of an embodiment. It is a flowchart which shows the operation of the control part which performs thermal power adjustment control operation in the grill device of other embodiments. 7 is a flowchart showing the operation of a control unit in Modification 1. FIG. 7 is a flowchart showing the operation of the control unit in Modification 2. FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
The present embodiment is a grill device to which a combustion device according to the present invention is applied, and the grill device of the embodiment is installed, for example, in a housing of a gas stove (not shown).

As shown in FIG. 1, the grill device 1 of the embodiment is a double-sided grill device, and is provided with a grill compartment 2 for storing food F and a ceiling of the grill compartment 2, and heats the food F from above. the upper heat burner 3a, which is provided at the lower part of the left and right side walls of the grill chamber 2 and heats the food F from below, and the upper heat side gas supply path that supplies fuel gas to the upper heat burner 3a. 4a, a gas supply passage 4b on the lower flame side that supplies fuel gas to the lower flame burner 3b, and each gas supply passage 4a, 4b on the upper flame side and lower flame side, and are provided to open and close the gas supply passages 4a, 4b. The grill device 1 includes latch-type solenoid valves 5a and 5b, and a control section 6 that controls the operation of the grill device 1.

A grill door 21 is provided at the front opening of the grill store 2, and an exhaust port 22 is formed at the rear end of the grill store 2 to discharge exhaust gas and the like from the grill store 2. The food F is placed on a cooking utensil 23 such as a grill plate or a gridiron, and the cooking utensil 23 is supported by a support frame 24 attached to the grill door 21. In this embodiment, the cooking utensil 23 is an example in which a grill plate is used. The space inside the grill chamber 2 becomes a combustion space heated by the upper and lower burners 3a and 3b. The food F and the cooking utensils 23 are objects to be heated by the upper and lower burners 3a and 3b. A temperature sensor (temperature detection means) 26 is provided in the grill chamber 2 to detect the temperature of the cooking utensil 23 by contacting the bottom surface of the cooking utensil 23. The temperature detected by the temperature sensor 26 is used as the cooking temperature to control the cooking operation. Note that an internal temperature sensor for detecting the temperature inside the grill 2 may be provided as a temperature detection means in the grill 2, or only one of the temperature sensor 26 and the internal temperature sensor may be installed. It may also be provided.

The gas supply path 4a of the upper fire burner 3a and the gas supply path 4b of the lower fire burner 3b are arranged to branch from the main gas supply path 4c, and each gas supply path 4a on the upper fire side and the lower fire side , 4b are provided with latch type solenoid valves 5a, 5b. The mainstream gas supply path 4c is provided with an electromagnetic safety valve 25 that serves as an on-off valve that shuts off the mainstream gas supply path 4c. The upper and lower burners 3a, 3b are each provided with ignition electrodes 7a, 7b for igniting the burners, and flame detectors (flame detection means) 8a, 8b constituted by thermocouples and detecting the combustion flame of the burners. There is. In addition, the flame detection means may use a flame rod or the like instead of a thermocouple. Each ignition electrode 7a, 7b of the upper and lower burners 3a, 3b is connected to an igniter 9, and by operating the igniter 9, spark discharge is generated at each ignition electrode 7a, 7b. The igniter 9 and the ignition electrodes 7a, 7b constitute ignition means for burning the fuel gas supplied to the upper and lower burners 3a, 3b.

The front panel of the gas stove (not shown) includes an operation panel that includes a temperature setting section 11 for setting the cooking temperature in the grill device 1, a timer setting section 12 for setting the cooking time, etc., and an operation panel for igniting and extinguishing the upper and lower burners 3a and 3b. An extinguishing switch 13 and the like to be operated are provided. The temperature setting section 11, timer setting section 12, on/off switch 13, etc. are operated by the user. Furthermore, the grill device 1 includes an abnormality notification means 14 that performs abnormality notification. The abnormality notification means 14 can provide notification by, for example, voice, buzzer, display, or the like.

The control unit 6 is an electronic unit composed of a microcomputer, an electronic circuit, etc., and includes various programs, a calculation unit, a storage unit, a timer, etc., and controls combustion, ignition, extinguishing, etc. of the upper and lower burners 3a and 3b. Controls the operation of the grill device 1. In addition, in the heating cooking operation, the control unit 6 performs a combustion process in which the upper and lower burners 3a and 3b are combusted and an extinguishing process in which the upper and lower burners 3a and 3b are extinguished to stop combustion so as to maintain the cooking temperature within a certain range. It is equipped with a control configuration that enables execution of alternately repeated thermal power adjustment control operation. In the grill device 1 of this embodiment, the switching between the combustion process and the extinguishing process is performed using the latching type solenoid valves 5a and 5b, and the control unit 6 instructs the latching type solenoid valves 5a and 5b to open and close the valves. By giving instructions, the operation of the fire power adjustment control operation that alternately repeats the combustion process and the extinguishing process is controlled.

Here, the latch type solenoid valve 5 will be explained.
As shown in FIG. 2, the latch type solenoid valve 5 includes a permanent magnet 51, a core member 52 that contacts the permanent magnet 51, a plunger 53 provided with a valve body 56, and an electromagnetic coil 54 that moves the plunger 53. It includes a spring 55 that urges the plunger 53 in the valve closing direction.

When opening the latch type solenoid valve 5, a valve driving voltage (for example, a positive voltage) is applied to the solenoid coil 54 for a certain period of time so that a forward magnetic flux is generated with respect to the magnetic flux of the permanent magnet 51. 53 moves against the biasing force of the spring 55 (states from (a) to (b) in FIG. 2), and the valve body 56 separates from the valve port 57 to enter the valve open state. Even if the electromagnetic coil 54 is de-energized in this valve-open state, the plunger 53 is attracted and held by the permanent magnet 51 via the core member 52, and the valve-open state is maintained. On the other hand, when closing the latch type solenoid valve 5, a valve driving voltage (for example, a negative voltage) is applied to the solenoid coil 54 for a certain period of time so that a magnetic flux in the opposite direction to the magnetic flux of the permanent magnet 51 is generated. , the magnetic force of the permanent magnet 51 is canceled and the plunger 53 is moved by the biasing force of the spring 55 (states from (b) to (a) in FIG. 2), and the valve body 56 closes the valve port 57 and closes the valve. state. Even if the electromagnetic coil 54 is de-energized in this valve closed state, the plunger 53 is maintained separated from the core member 52 by the biasing force of the spring 55, and the valve closed state is maintained.

In this way, the latch type solenoid valve 5 is opened or closed by applying a valve driving voltage to the solenoid coil 54 for a required period of time, and is then maintained in the open or closed state by the permanent magnet 51 or the spring 55. be done. The latch type solenoid valve 5 does not have high reliability in maintaining the valve open and closed states because the electromagnetic coil 54 is de-energized after the valve body 56 moves. Compared to the valve body position which cannot be maintained unless the electromagnetic coil is continuously energized, the valve has advantages such as lower power consumption, less heat generated by the electromagnetic coil 54, and relatively low cost. Therefore, for example, it is desirable to be able to use the latching type solenoid valve 5 for switching between the combustion process and the extinguishing process without any problem in a combustion apparatus using a dry battery as a power source.

Next, the operation when the latch type solenoid valve 5 is used when performing the combustion process and the extinguishing process will be described.
In the time chart of FIG. 3, FIGS. 3(a) and 3(b) are examples before countermeasures are taken, and FIGS. 3(c) and (d) are examples of the embodiment. In addition, below, a combustion process and an extinguishing process are demonstrated as what burns and extinguishes both the upper fire burner 3a and the lower fire burner 3b. In the time chart of FIG. 3 and the following description, the burner 3, gas supply path 4, latching type electromagnetic valve 5, and ignition electrode 7 refer to both the upper fire side and the lower fire side.

As shown in FIG. 3(a), when starting the combustion process, a valve drive voltage (for example, +3V positive voltage) that instructs the latch type solenoid valve 5 to open is applied for a certain period of time. As a result, the latch type solenoid valve 5 opens, the gas supply path 4 opens, and fuel gas is supplied to the burner 3. At this time, the igniter 9 is operated for a certain period of time to cause the ignition electrode 7 to generate a spark discharge, so that the burner 3 is ignited and burned, and a combustion process is executed. Next, when the combustion process is temporarily interrupted and the extinguishing process is started, a valve drive voltage (for example, a negative voltage of -3V) that instructs the latch type solenoid valve 5 to close is applied for a certain period of time. As a result, the latch type solenoid valve 5 closes, the gas supply path 4 is cut off, the burner 3 is extinguished, and the extinguishing process is executed. By controlling the opening and closing of the latch type solenoid valve 5 as described above, it is possible to perform a thermal power adjustment control operation in which the combustion process and the extinguishing process are alternately repeated.

Here, when using the latch type solenoid valve 5, as shown in FIG. 3(b), the valve driving voltage (positive voltage) that causes the latch type solenoid valve 5 to open due to a malfunction due to external noise etc. during the extinguishing process. When is applied and the latch type solenoid valve 5 is opened, fuel gas is supplied from the gas supply path 4 to the burner 3, and gas continues to be released from the burner 3. If this state of gas release continues for a long time during the extinguishing process, a gas odor will occur, and when the combustion process starts again, the stagnant gas will also ignite, causing combustion accompanied by loud noise, which may be harmful to the user. This may cause discomfort and anxiety. Since the latch type solenoid valve 5 does not have a means for detecting the position of the valve body and does not output an answerback signal, the control unit 6 may cause the latch type solenoid valve 5 to open unexpectedly due to malfunction after the valve is instructed to close. However, it cannot be directly recognized.

Therefore, in this embodiment, as shown in FIG. 3(c), during the extinguishing process, a valve driving voltage (for example, -3 V A negative voltage (see the black part in FIG. 3(c)) is applied. That is, the control unit 6 has a control configuration that instructs the latch type solenoid valve 5 to close continuously every time a predetermined period of time S elapses upon the start of the extinguishing process. Here, the predetermined time S is the time during which the latch type solenoid valve 5 is opened when the burner 3 is in the extinguished state, so that the user may feel a gas odor or the combustion will be accompanied by a loud noise when ignited in the next combustion process. The time is set to be shorter than the amount of gas released from the burner 3. This predetermined time S can be determined through experiments or the like depending on the combustion device such as the grill device 1. Note that the timing of the valve closing instruction by the continuous valve closing instruction every predetermined time S is, for example, a predetermined timing based on the valve closing instruction to the latch type solenoid valve 5 that starts the extinguishing process or the time when it is confirmed that the burner 3 is extinguished. The time S may be counted periodically, and the timing of the first consecutive valve closing instruction after entering the extinguishing process is the timing of the valve closing instruction to the latch type solenoid valve 5 that starts the extinguishing process. Alternatively, a predetermined time S is counted based on the time when it is confirmed that burner 3 is extinguished, and for the timing of the valve closing instruction from the second and subsequent consecutive valve closing instructions, the predetermined time S is counted each time based on the previous valve closing instruction. may be equal.

With the continuous valve closing instruction, as shown in FIG. 3(d), even if the latch type solenoid valve 5 opens due to malfunction during the fire extinguishing process, the latch type solenoid valve 5 is immediately closed and gas is supplied. By blocking the path 4, it is possible to prevent the burner 3 from continuing to release gas. In addition, after the control unit 6 instructs the latch type solenoid valve 5 to open in order to perform the combustion process after the extinguishing process, the continuous valve closing instruction is interrupted. Since the valve 5 is not closed and remains open, a normal combustion process can be performed.

Next, in the grill device 1 of the embodiment, the operation of the thermal power adjustment control operation by the control unit 6 will be described.
Referring to the flowchart in FIG. 4, the user sets the cooking temperature with the temperature setting section 11 of the operation panel, sets the cooking time with the timer setting section 12, and turns on the on/off switch 13, thereby controlling the control section. 6 ignites and burns the upper and lower burners 3a and 3b to start heating cooking operation (step S1). With the start of the cooking operation, the upper and lower burners 3a and 3b are combusted to perform a combustion process, so that the temperature inside the grill chamber 2 and the temperature of the food F rise. Then, in step S2, the control unit 6 determines whether the temperature detected by the temperature sensor 26 has risen to the extinguishing temperature a or higher. Here, the extinguishing temperature a is, for example, a temperature value several degrees higher than the cooking temperature set by the temperature setting unit 11, but can be determined by experiment etc. depending on the grill device 1.

If it is determined in step S2 that the temperature detected by the temperature sensor 26 has not risen above the extinguishing temperature a ("NO" in step S2), the process proceeds to step S12, and the control unit 6 determines the heating cooking operating time. However, it is determined whether the cooking time t set by the timer setting section 12 has elapsed. If it is determined that the operating time has exceeded the cooking time t ("YES" in step S12), an end notification is issued, the electromagnetic safety valve 25 (SV) is closed, and the heating cooking operation is ended (step S14). If it is determined that the operating time has not exceeded the cooking time t ("NO" in step S12), the process returns to step S2.

If it is determined in step S2 that the temperature detected by the temperature sensor 26 has risen to the extinguishing temperature a ("YES" in step S2), the process proceeds to step S3 to start the extinguishing process, and the control unit 6: A closing instruction is given to the latch type solenoid valves 5a and 5b. In response to this valve closing instruction, a valve driving voltage (for example, a negative voltage) that causes the latched electromagnetic valves 5a and 5b to close is applied for a certain period of time (for example, 0.5 seconds). As a result, the latch type solenoid valves 5a, 5b are closed, and the upper and lower burners 3a, 3b are extinguished. In subsequent step S4, the control unit 6 determines whether the detection voltage (TC detection voltage) of the flame detectors 8a, 8b has fallen below the extinguishing detection voltage V1 within a certain period of time after the instruction to close the latch type solenoid valves 5a, 5b. Decide whether or not. Here, the extinguishing detection voltage V1 is, for example, the thermocouple voltage value of the flame detectors 8a and 8b when there is no combustion flame in the burner. If the detection voltage of the flame detectors 8a, 8b on either the upper flame side or the lower flame side has not fallen below the extinguishing detection voltage V1 (in the case of "NO" in step S4), the latch type solenoid valves 5a, 5b It is determined that there is an open failure, and the process proceeds to step S5, where the cooking operation is stopped due to an error. In addition, when stopping due to an error, the control unit 6 issues an abnormality notification using the abnormality notification means 14 and closes the electromagnetic safety valve 25 (the operation of stopping due to an error described hereinafter is also basically the same). On the other hand, if the detection voltage of the flame detectors 8a, 8b falls below the extinguishing detection voltage V1 ("YES" in step S4), it can be determined that the upper and lower burners 3a, 3b are extinguished and the extinguishing process has started; Proceed to step S6.

When the extinguishing process is executed, the temperature inside the grill chamber 2 and the temperature of the food F are reduced. In step S6, the control unit 6 determines whether the temperature detected by the temperature sensor 26 has fallen below the combustion temperature b. Here, the combustion temperature b is, for example, a temperature value several degrees lower than the cooking temperature set by the temperature setting unit 11, but can be determined by experiment etc. depending on the grill device 1. While it is determined in step S6 that the temperature detected by the temperature sensor 26 has not decreased below the combustion temperature b (if "NO" in step S6), the extinguishing process is continued and the process proceeds to step A. A continuous valve closing instruction is given to the latch type solenoid valves 5a and 5b. Note that the processing operation of the continuous valve closing instruction in step A will be described later.

On the other hand, if it is determined in step S6 that the temperature detected by the temperature sensor 26 has fallen below the combustion temperature b ("YES" in step S6), the step Proceeding to S7, the control unit 6 instructs the latch type solenoid valves 5a, 5b to open. In response to this valve opening instruction, a valve driving voltage (for example, positive voltage) for opening the latched electromagnetic valves 5a and 5b is applied for a certain period of time (for example, 0.5 seconds). Thereby, the latch type solenoid valves 5a, 5b are opened, and fuel gas is supplied from the gas supply paths 4a, 4b to the upper and lower burners 3a, 3b. Subsequently, in step S8, the control unit 6 operates the igniter 9 for a certain period of time according to the ignition instruction, and causes the ignition electrodes 7a and 7b to generate spark discharge. This causes the upper and lower burners 3a, 3b to ignite and burn. In the following step S9, it is determined whether or not the detection voltage of the flame detectors 8a, 8b has risen to the ignition detection voltage V2 or higher within a certain period of time from the instruction to ignite the igniter 9 or the instruction to open the latch type electromagnetic valves 5a, 5b. . Here, the ignition detection voltage V2 is, for example, the thermocouple voltage value of the flame detectors 8a and 8b when a combustion flame is formed in the burner. If the detection voltage of the flame detectors 8a, 8b on either the upper flame side or the lower flame side has not risen above the ignition detection voltage V2 (in the case of "NO" in step S9), the latch type solenoid valves 5a, 5b It is determined that there is a closing failure, and the process proceeds to step S10, where the cooking operation is stopped due to an error. On the other hand, if the detection voltage of the flame detectors 8a, 8b rises to the ignition detection voltage V2 or higher ("YES" in step S9), it can be determined that the upper and lower burners 3a, 3b are burned and the combustion process is restarted, Proceed to step S11. When the combustion process is performed again, the temperature inside the grill chamber 2 and the temperature of the food F rise again.

In step S11, the control unit 6 determines whether or not the heating cooking operation time has elapsed the cooking time t set by the timer setting unit 12, and if it is determined that the operation time has elapsed the cooking time t ( If "YES" in step S11), the process proceeds to step S14 to end the heating cooking operation, and if it is determined that the operating time has not elapsed the cooking time t (if "NO" in step S11), the process is continued. Return to step S2. Therefore, the processes from step S2 to step S12 are repeatedly performed until the heating cooking operation time reaches the cooking time t. That is, in the cooking operation, a fire power adjustment control operation is performed in which a combustion process and an extinguishing process are alternately repeated.

Next, the operation of the continuous valve closing instruction in step A will be explained.
In Step A1, the control unit 6 determines whether or not the period of the extinguishing process time has exceeded a predetermined time S due to the start of the extinguishing process. Here, the predetermined time S is defined as a period in which the upper and lower burners 3a are in a state in which the latched solenoid valves 5a and 5b are opened in the burner extinguished state, such that the user senses a gas odor or combustion occurs with a loud noise when ignited. , 3b is set to a shorter time (for example, 15 seconds) than the amount of gas released from the gases.

If it is determined that the period of the extinguishing process time has exceeded the predetermined time S ("YES" in step A1), in the subsequent step A2, the control unit 6 closes the latch type solenoid valves 5a and 5b. Give instructions. In response to this valve closing instruction, a valve drive voltage (for example, a negative voltage) is applied for a certain period of time to the latch type solenoid valves 5a and 5b to cause the valves to close. With this valve closing instruction again, if the latching type solenoid valves 5a, 5b were closed normally, the closed state will be maintained, and if the latching type solenoid valves 5a, 5b were opened due to an abnormality, the valve will remain closed. The valve is closed.

On the other hand, if the cycle of the extinguishing process time has not exceeded the predetermined time S ("NO" in step A1) or after the valve closing instruction is given in step A2, the process proceeds to step S13. In step S<b>13 , the control unit 6 determines whether the cooking operation time has exceeded the cooking time t set by the timer setting unit 12 . If it is determined that the operating time has exceeded the cooking time t ("YES" in step S13), the process proceeds to step S14, where the heating cooking operation is ended, and it is determined that the operating time has not exceeded the cooking time t. (“NO” in step S13), the process returns to step S6. Therefore, as long as the heating cooking operation time has not exceeded the cooking time t (in the case of "NO" in step S13) and the temperature detected by the temperature sensor 26 has not decreased below the combustion temperature b (step In the case of "NO" in S6), the extinguishing process is continued, and during this extinguishing process, in step A, the control unit 6 controls the latch type solenoid valves 5a and 5b so that the cycle of the extinguishing process time is a predetermined time S. A continuous valve closing instruction is executed in which the valve closing instruction is repeated each time the valve passes.

As described above, according to the present embodiment, the latch type solenoid valves 5a and 5b open unexpectedly due to an abnormality such as external noise or circuit malfunction during the extinguishing process, and gas is released from the upper and lower burners 3a and 3b. Even if this occurs, the latch type solenoid valves 5a, 5b are promptly closed by the continuous valve closing instruction (step A2), so gas release from the upper and lower burners 3a, 3b continues for a long time. can be prevented. Therefore, it is possible to prevent the release of gas from the upper and lower burners 3a and 3b that may cause discomfort or anxiety to the user, such as gas odor or combustion accompanied by loud noise upon ignition when restarting the combustion process. becomes. Therefore, by using the latch-type solenoid valves 5a and 5b, it is possible to provide a grill device 1 that can be used with peace of mind by the user while reducing costs by using the latch type solenoid valves 5a and 5b.

Further, when the flame detectors 8a, 8b detect extinguishing after the instruction to close the latch type solenoid valves 5a, 5b for starting the extinguishing process, a continuous valve closing instruction is issued ("YES" in step S4). ”→If “NO” in step S6). That is, when the flame detectors 8a, 8b detect the extinguishing of the upper and lower burners 3a, 3b at the start of the extinguishing process, it is determined that a predetermined condition is satisfied, and a continuous valve closing instruction is issued. Thereby, the control unit 6 can grasp the soundness (normal operation) of the latch type solenoid valves 5a, 5b at the time of starting the extinguishing process by confirming that the upper and lower burners 3a, 3b are extinguished using the flame detectors 8a, 8b. It is also possible to confirm the start of the fire extinguishing process. Therefore, the latch type solenoid valves 5a, 5b can be normally closed by the valve closing instruction from the control unit 6, so even if the latch type solenoid valves 5a, 5b open due to malfunction etc. during the extinguishing process, The continuous valve closing instruction causes the latch type solenoid valves 5a, 5b to close, thereby blocking the gas supply paths 24a, 24b, thereby preventing the gas from being released from the upper and lower burners 3a, 3b from continuing.

During the combustion process, continuous valve closing instructions are not given. That is, when the temperature detected by the temperature sensor 26 becomes lower than the combustion temperature b ("YES" in step S6), after the latch type solenoid valves 5a and 5b are instructed to open (step S7), or after the latch type solenoid valves 5a and 5b are instructed to open, After the combustion flames of the upper and lower burners 3a, 3b are detected by the flame detectors 8a, 8b after the instruction to open the valves 5a, 5b (in the case of "YES" in step S9), the continuous valve closing instruction is interrupted. As a result, the latched electromagnetic valves 5a and 5b are not closed due to continuous valve closing instructions during the combustion process, but are kept open, so that a normal combustion process can be performed.

In the embodiment, when executing the continuous valve closing instruction, if extinguishing is detected by the flame detectors 8a and 8b, which is a predetermined condition, and it is confirmed that the upper and lower burners 3a and 3b are extinguished (if "YES" in step S4). However, the continuous valve closing instruction may be executed regardless of whether the flame detectors 8a and 8b detect extinguishment. In addition, the predetermined conditions for issuing a continuous valve closing instruction during the extinguishing process are not limited to confirming that the upper and lower burners 3a and 3b are extinguished, but when the conditions for starting the extinguishing process are met (for example, when the temperature sensor 26 When the detected temperature exceeds the extinguishing temperature a, when the latch type solenoid valves 5a and 5b are instructed to close in order to carry out the extinguishing process), or when the start of the extinguishing process is confirmed (when the temperature sensor 26 detects a predetermined temperature (e.g., when information is detected).

(Other embodiments)
Next, another embodiment will be described.
Another embodiment differs from the previous embodiment in that during the extinguishing process, an ignition instruction is repeatedly given every predetermined time S elapses. The operation of the control unit 6 in another embodiment will be described below according to the flowchart in FIG. Note that in FIG. 5, steps given the same numbers as in FIG. 4 follow the operations in the embodiment described above, and a description thereof will be omitted if necessary.

Referring to the flowchart of FIG. 5, the extinguishing process is started by issuing a first valve closing instruction to the latch type solenoid valves 5a and 5b in step S3, and when the process proceeds to step A, the control unit 6 executes the extinguishing process in step A1. It is determined whether the period of process time has passed a predetermined time S or not. The first valve closing instruction is an instruction to apply a valve driving voltage (for example, a negative voltage) to the latch type solenoid valves 5a and 5b for a certain period of time to cause them to close. If it is determined that the cycle of the extinguishing process time has not exceeded the predetermined time S ("NO" in step A1), the process proceeds to step B2. If it is determined that the cycle of the extinguishing process time has exceeded the predetermined time S ("YES" in step A1), the process proceeds to step B1, where the igniter 9 is operated for a predetermined period of time. When the igniter 9 is activated, spark discharge is generated at the ignition electrodes 7a and 7b, so if the latching type solenoid valves 5a and 5b are opened due to malfunction during the extinguishing process, spark discharge is generated from the upper and lower burners 3a and 3b. The gas ignites and a combustion flame is formed.

In subsequent step B2, the control unit 6 determines whether the detection voltages of the flame detectors 8a and 8b have risen to or above the ignition detection voltage V2. By determining whether or not the upper and lower burners 3a, 3b are burning according to the judgment in step B2, it is confirmed whether or not the latch type solenoid valves 5a, 5b are opened during the extinguishing process. If the detection voltage of the flame detectors 8a, 8b on either the upper flame side or the lower flame side rises to the ignition detection voltage V2 or higher ("YES" in step B2), the ignition of the upper and lower burners 3a, 3b is detected. Yes, it can be determined that the latch type electric valves 5a and 5b were open. In this case, the process proceeds to step A2, and the control unit 6 issues a second valve closing instruction, which is a continuous valve closing instruction, to the latch type solenoid valves 5a and 5b. In response to the second valve closing instruction, a valve driving voltage (for example, a negative voltage) that causes the latch type solenoid valves 5a and 5b to close is applied for a certain period of time. This second valve closing instruction makes it possible to close the latch type solenoid valves 5a, 5b that have been opened due to an abnormality, and attempt to return to the normal state. The flame detectors 8a and 8b are provided corresponding to the upper burner 3a and the lower burner 3b, respectively, and can individually detect the combustion flames of the upper burner 3a and the lower burner 3b. Therefore, the second valve closing instruction in step A2 is issued to the latch-type solenoid valves 5a, 5a, and 5b on the burner 3a, 3b side corresponding to the flame detectors 8a, 8b whose detection voltage has increased to the ignition detection voltage V2 or higher as determined in step B2. 5b.

On the other hand, if the detection voltages of the flame detectors 8a and 8b have not risen above the ignition detection voltage V2 in step B2 ("NO" in step B2), the latch type solenoid valves 5a and 5b close normally. In this case, the control unit 6 does not issue a valve closing instruction (second valve closing instruction) to the latch type solenoid valves 5a and 5b, advances the process to step S13, and continues the thermal power adjustment control operation. do.

When the second valve closing instruction is given to the latch type electromagnetic valves 5a, 5b in step A2, in the subsequent step B3, the control unit 6 controls the flame detectors 8a, 8b by the time a certain period of time elapses after the second valve closing instruction. It is determined whether the detection voltage has decreased below the valve failure detection voltage V3. Note that the valve failure detection voltage V3 is, for example, the thermocouple voltage value of the flame detectors 8a and 8b when there is no combustion flame in the burner. If the detection voltage of the flame detectors 8a, 8b falls below the valve failure detection voltage V3 ("YES" in step B3), the upper and lower burners 3a, 3b burned by the ignition instruction (step B1) during the extinguishing process. It has been confirmed that the fire has been extinguished, and it can be determined that the latch type solenoid valves 5a and 5b are operating normally and closed. This returns to the normal extinguishing process. Therefore, since the extinguishing process can be executed normally, the control unit 6 advances the process to step S13 and continues the thermal power adjustment control operation.

If it is determined in step B3 that the detection voltage of the flame detectors 8a, 8b on either the upper flame side or the lower flame side does not fall below the valve failure detection voltage V3 (in the case of "NO" in step B3), the latch It is determined that the electromagnetic valves 5a and 5b have an open failure, and in step B4, the control unit 6 stops the cooking operation due to an error. Note that the valve failure detection voltage V3 determined in step B3 may be the same as the extinguishing detection voltage V1 determined in step S4.

As described above, according to the other embodiments, when the flame detectors 8a, 8b detect combustion flames of the upper and lower burners 3a, 3b as a result of issuing an ignition instruction during the extinguishing process, a continuous valve closing instruction is issued. By issuing a second valve closing instruction to the latch type solenoid valves 5a, 5b, if the opening of the latch type solenoid valves 5a, 5b during the fire extinguishing process is a temporary abnormality, the second valve closing instruction is issued to the latch type solenoid valves 5a, 5b. It becomes possible to close the valves 5a and 5b and return to the normal extinguishing process. That is, when the flame detectors 8a, 8b no longer detect the combustion flames of the upper and lower burners 3a, 3b that were combusted by the ignition instruction during the extinguishing process as a result of issuing the second valve closing instruction for the latch type solenoid valves 5a, 5b. Since it is determined that the latched electromagnetic valves 5a and 5b have closed and the fire extinguishing process has returned to the normal state, the firepower adjustment control operation is continued, thereby improving convenience for the user. Therefore, when performing fire power adjustment control operation using the latch type solenoid valves 5a and 5b, even if the latch type solenoid valves 5a and 5b are unexpectedly opened during the extinguishing process, there will be no gas odor or ignition at the start of the combustion process. It is possible to prevent gas discharge from the upper and lower burners 3a and 3b, which sometimes causes a user to feel discomfort and anxiety, such as combustion accompanied by loud noise, and to improve convenience for the user.

On the other hand, even if the second closing instruction for the latch-type solenoid valves 5a, 5b is issued as a continuous valve closing instruction, the flame detectors 8a, 8b detect the combustion flames of the upper and lower burners 3a, 3b that were combusted by the ignition instructions during the extinguishing process. If detected, it is determined that the latch-type solenoid valves 5a and 5b have opened failure, and the cooking operation is stopped due to an error. In this case, by closing the electromagnetic safety valve 25 and cutting off the gas supply path 24c, the upper and lower burners 3a and 3b that were burned by the ignition instruction during the extinguishing process are extinguished, and the gas is released from the upper and lower burners 3a and 3b. This makes it possible to safely stop the grill device 1.

Therefore, according to another embodiment, as the grill device 1 that can execute the thermal power adjustment control operation, the grill device 1 that the user can use with peace of mind while suppressing the cost by using the latch type solenoid valves 5a and 5b is provided. can be provided.

In other embodiments, the second valve closing instruction is issued only once in step A2, but while the combustion flames of the upper and lower burners 3a and 3b are detected (in the case of "NO" in step B2), The second valve closing instruction may be issued several times. Thereby, the latch-type solenoid valves 5a and 5b, which have opened due to a temporary abnormality, can be easily returned to a normal closed state.

In other embodiments, the second valve closing instruction (step A2), which is a continuous valve closing instruction, is an instruction to apply a valve driving voltage for a certain period of time to cause the latching type solenoid valves 5a and 5b to close. As a second valve closing instruction (continuous valve closing instruction), the latch type solenoid valves 5a and 5b are closed until the extinguishing process ends or the remaining time of the extinguishing process becomes less than the predetermined time S. The valve driving voltage for operating the valve may be continuously applied.

Next, a modification will be explained.
(1) Modification example 1
Modified example 1 is such that the predetermined condition for issuing a continuous valve closing instruction in the above embodiment is a case where the temperature detected by the temperature sensor 26 detects predetermined temperature information. In this first modification, when the temperature detected by the temperature sensor 26 drops to a predetermined temperature due to the start of the extinguishing process, it is assumed that a predetermined condition is satisfied and a continuous valve closing instruction process is executed.

Referring to the flowchart of FIG. 6, in the first modification, after step S3, there is provided a step (steps S411 to S413) of checking whether the upper and lower burners 3a, 3b are extinguished based on the temperature detected by the temperature sensor 26. That is, after instructing the latch-type solenoid valves 5a and 5b to close in order to start the extinguishing process in step S3, in the subsequent step S411, the control unit 6 determines that the temperature detected by the temperature sensor 26 is the extinguishing confirmation temperature c (for example, the extinguishing temperature Determine whether the temperature has decreased to less than a-1℃). When the latch type solenoid valves 5a, 5b are closed in response to a valve closing instruction and the upper and lower burners 3a, 3b are extinguished, the temperature detected by the temperature sensor 26 decreases. Therefore, if the temperature detected by the temperature sensor 26 falls below the extinguishing confirmation temperature c (step If "NO" in S412 → "YES" in step S411), it is determined that the upper and lower burners 3a and 3b have been confirmed to be extinguished, and the process proceeds to step A, which instructs continuous valve closing after processing in step S6. do. That is, it is determined that the temperature detected by the temperature sensor 26 has fallen below the extinguishing confirmation temperature c by the time a certain period of time (t1) has elapsed after the instruction to close the latched electromagnetic valves 5a and 5b. It is assumed that certain conditions are met.

On the other hand, in a state where the temperature detected by the temperature sensor 26 does not fall below the extinguishing confirmation temperature c (in the case of "NO" in step S411), the valve failure detection time t1 has elapsed after the instruction to close the latch type solenoid valves 5a and 5b is given. If so ("YES" in step S412), it is determined that the latch type solenoid valves 5a and 5b have an opening failure, and the cooking operation is stopped due to an error (step S413).

The determinations in steps S411 and S412 are to confirm that the upper and lower burners 3a and 3b are extinguished, and also to determine whether or not there is an opening failure in the latch type solenoid valves 5a and 5b. In other words, if the latching type solenoid valves 5a, 5b have an opening failure, the latching type solenoid valves 5a, 5b will not be closed even if a valve closing instruction is issued in step S3, and the combustion of the upper and lower burners 3a, 3b will continue. Therefore, the temperature detected by the temperature sensor 26 does not decrease. When the latch type solenoid valves 5a and 5b operate normally, the latch type solenoid valves 5a and 5b are closed by issuing a valve closing instruction in step S3, the upper and lower burners 3a and 3b are extinguished, and the temperature inside the grill chamber 2 is The temperature of the food F decreases, and the temperature detected by the temperature sensor 26 decreases. Therefore, the control unit 6 can check the extinguishing of the upper and lower burners 3a, 3b based on the temperature detected by the temperature sensor 26, so it can grasp the health (normal operation) of the latch type solenoid valves 5a, 5b at the time of starting the extinguishing process. It is also possible to recognize the start of the extinguishing process. Therefore, even if the latching type solenoid valves 5a, 5b open due to malfunction or the like during the extinguishing process, the latching type solenoid valves 5a, 5b are closed by a continuous valve closing instruction, and gas is released from the upper and lower burners 3a, 3b. can be prevented from continuing.

In the first modification, the extinguishing confirmation temperature c in step S411 is set to a temperature value lower than the extinguishing temperature a, but in the judgment in step S411, it is determined whether the temperature detected by the temperature sensor 26 is less than the extinguishing confirmation temperature c. Therefore, the extinguishing confirmation temperature c, which is the judgment value of the temperature information, may be the same temperature value as the extinguishing temperature a.

(2) Modification 2
In the second modification, the predetermined condition for issuing a continuous valve closing instruction in the embodiment is a case where the temperature detected by the temperature sensor 26 detects predetermined temperature information. In this modification example 2, when a predetermined temperature drop gradient is confirmed in the temperature detected by the temperature sensor 26 at the start of the extinguishing process, it is assumed that a predetermined condition is satisfied and a continuous valve closing instruction process is executed.

Referring to the flowchart in FIG. 7, in the second modification, after step S3, there is provided a step (steps S421 to S423) of checking whether the upper and lower burners 3a, 3b are extinguished based on the temperature detected by the temperature sensor 26. That is, after instructing the latch-type solenoid valves 5a and 5b to close in order to start the fire extinguishing process in step S3, the control unit 6 performs the command in step S421 until the valve failure detection time t2 (for example, 10 seconds) has elapsed. If "NO"), it is determined in step S422 whether the temperature detected by the temperature sensor 26 does not exceed a predetermined temperature increase ΔT (for example, extinguishing temperature a+5° C.). When the latch-type electromagnetic valves 5a and 5b are closed in response to a valve-closing instruction and the upper and lower burners 3a and 3b are extinguished, the temperature detected by the temperature sensor 26 shows a temperature decreasing gradient. Therefore, if the valve failure detection time t2 elapses without the temperature detected by the temperature sensor 26 exceeding the temperature rise ΔT ("NO" in step S422 → "YES" in step S421), the upper and lower burners 3a, 3b It is determined that the extinguishment of the fire has been confirmed, and after the processing in step S6, the process proceeds to step A where a continuous valve closing instruction is issued. In other words, it is continuously confirmed that no rise in temperature is observed in the temperature detected by the temperature sensor 26 (indicating a tendency for the temperature to fall) even after a certain period of time (t2) has elapsed after the instruction to close the latch type solenoid valves 5a and 5b. It is assumed that predetermined conditions for issuing a valve closing instruction are met.

On the other hand, if a temperature increase gradient exceeding the temperature increase ΔT is detected in the temperature detected by the temperature sensor 26 before the valve failure detection time t2 elapses after the instruction to close the latch type solenoid valves 5a and 5b (step S422 If "YES"), it is determined that the latch-type solenoid valves 5a and 5b have an opening failure, and the cooking operation is stopped due to an error (step S423).

The determinations in steps S421 and S422 are to confirm that the upper and lower burners 3a and 3b are extinguished, and also to determine whether or not there is an opening failure in the latch type solenoid valves 5a and 5b. In other words, if the latching type solenoid valves 5a, 5b have an opening failure, the latching type solenoid valves 5a, 5b will not be closed even if a valve closing instruction is issued in step S3, and the combustion of the upper and lower burners 3a, 3b will continue. Therefore, the temperature detected by the temperature sensor 26 continues to rise. When the latch type solenoid valves 5a and 5b operate normally, the latch type solenoid valves 5a and 5b are closed by issuing a valve closing instruction in step S3, the upper and lower burners 3a and 3b are extinguished, and the temperature inside the grill chamber 2 is The temperature of the food F decreases, and the temperature detected by the temperature sensor 26 decreases. Therefore, the control unit 6 can check the extinguishing of the upper and lower burners 3a, 3b based on the temperature detected by the temperature sensor 26, so it can grasp the health (normal operation) of the latch type solenoid valves 5a, 5b at the time of starting the extinguishing process. It is also possible to recognize the start of the extinguishing process. Therefore, even if the latching type solenoid valves 5a, 5b open due to malfunction or the like during the extinguishing process, the latching type solenoid valves 5a, 5b are closed by a continuous valve closing instruction, and gas is released from the upper and lower burners 3a, 3b. can be prevented from continuing.

In the second modification, the temperature increase ΔT is used as the judgment value in step S422, but the temperature gradient of the temperature drop may be used as the judgment value, and temperature information including any temperature gradient, temperature change, etc. may be used as the judgment value. You can.

Note that the present invention is not limited to the above-described embodiments and the above-mentioned modifications, and various changes can be made within the scope of the claims.

For example, in the embodiment, the latch-type solenoid valves 5a and 5b are provided in the gas supply paths 4a and 4b on the upper and lower fire sides, respectively, but the latch-type solenoid valve 5 is provided in the mainstream gas supply path 4c on the upstream side. It is also possible to provide one latch type solenoid valve 5 and issue the continuous valve closing instruction to the latch type solenoid valve 5. That is, the combustion apparatus of the present invention includes a plurality of burners, a gas supply path is branched to supply fuel gas to each burner, and a latching type electromagnetic wire is connected to the gas supply path at a position upstream of the branch. In a device having a valve, the latch type solenoid valve may be configured to issue the continuous valve closing instruction.

In the embodiment, in the combustion process, both the upper burner 3a and the lower burner 3b are burned, but during all or part of the combustion process (including all or part of one combustion process), the upper burner 3a is burned. Alternatively, only one of the lower burners 3b may be burned.

In the embodiment, a valve closing instruction is given as a continuous valve closing instruction by applying a valve driving voltage for a certain period of time to the latch type solenoid valves 5a and 5b to cause the valves to close every time a predetermined period of time S has elapsed (step A). The continuous valve closing instruction in the present invention is a valve drive that causes the latch type solenoid valves 5a and 5b to close until the extinguishing process ends or the remaining time of the extinguishing process becomes less than the predetermined time S. The voltage may be continued to be applied. The timing for starting the continuous application of the valve drive voltage to cause the valve to close may be when the valve is first entered into step A, or when the valve is instructed to close in step S3.

The present invention may be applied to a single-sided grilling device that includes only either an upper burner or a lower burner.

Further, the present invention may be applied to a gas stove. In this case, the gas stove is equipped with a plurality of stove burners, the gas supply path is branched to supply fuel gas to each stove burner, and the latch corresponding to each stove burner in the branched gas supply path is The control unit may be configured to be able to individually instruct each stove burner to open and close the latch-type solenoid valve, as well as to instruct the latch-type solenoid valve to close continuously. That is, in some or all of the plurality of stove burners, the control section enables execution of a thermal power adjustment control operation that alternately repeats a combustion process and an extinguishing process, and issues the continuous valve closing instruction during this thermal power adjustment control operation. The configuration can be configured to do this. In addition, a stove burner is a type of burner that forms a parent-child burner (one in which the burner parts forming the flame hole are stacked in several stages, one in which the burner part forming the flame hole is arranged inside and outside in an annular shape, etc.). The unit may be configured to be able to individually instruct each burner unit of the parent-child burner to open and close the latch type solenoid valve, as well as instruct the valve to close continuously.

1 Grill device (combustion device)
2 Grill chamber 3a Upper burner 3b Lower burner 4a, 4b, 4c Gas supply paths 5a, 5b Latch type solenoid valve 6 Control section 7a, 7b Ignition electrode 8a, 8b Flame detector (flame detection means)
9 Igniter 11 Temperature setting section 12 Timer setting section 13 Fire extinguishing switch 21 Grill door 22 Exhaust port 23 Cooking utensil 24 Support frame 25 Electromagnetic safety valve 26 Temperature sensor (temperature detection means)
51 Permanent magnet 52 Core member 53 Plunger 54 Electromagnetic coil 55 Spring 56 Valve body 57 Valve port F Food to be cooked

Claims (7)

Burna and
a gas supply path that supplies fuel gas to the burner;
a latch type solenoid valve that opens and closes the gas supply path;
a control unit that instructs the latch type solenoid valve to open or close;
The control unit performs a combustion process in which the latching type solenoid valve is opened in response to an opening instruction to cause the burner to burn, and a fire extinguishing process in which the latching type solenoid valve is closed in response to a valve closing instruction to extinguish the burner. When performing a thermal power adjustment control operation that alternately repeats the above, the combustion method is provided with a control configuration that issues a continuous valve closing instruction to the latching electromagnetic valve in a predetermined condition after instructing the latching electromagnetic valve to close. Device. The combustion device according to claim 1,
comprising flame detection means for detecting combustion flame of the burner,
The control unit is configured to issue a valve closing instruction to the latch type solenoid valve as the continuous valve closing instruction when the flame detection means, which is the predetermined condition, detects extinguishing of the burner. The combustion device according to claim 1,
It has a temperature detection means for detecting the temperature of the combustion space and/or the heated object,
The control unit is configured to issue a valve closing instruction to the latch type electromagnetic valve as the continuous valve closing instruction when the temperature detection means detects predetermined temperature information that is the predetermined condition. The combustion device according to any one of claims 1 to 3,
The control unit is configured to issue a valve closing instruction to the latch type solenoid valve every predetermined period of time as the continuous valve closing instruction. The combustion device according to any one of claims 1 to 3,
In the combustion device, the control unit suspends the continuous valve closing instruction after instructing the latch type electromagnetic valve to open. The combustion device according to any one of claims 1 to 3,
A plurality of burners are provided,
The gas supply path is branched to supply fuel gas to each of the burners,
The latch type solenoid valve is provided in each of the branched gas supply paths,
A combustion apparatus, wherein the control unit includes a control configuration capable of instructing the latch type solenoid valve to open, close, and continuously close the latched electromagnetic valve for each burner individually. A heating cooker comprising the combustion device according to any one of claims 1 to 3.