JP6906403B2 - Gas stove - Google Patents

Description

The present invention relates to a gas stove having a function of detecting abnormal combustion of fuel gas supplied to a stove burner.

Gas stoves that heat cooking containers such as pots by burning fuel gas with a stove burner are widely used. The stove burner includes a burner body having a plurality of flame ports and a mixing tube extending from the burner body. The fuel gas supplied through the gas passage is injected from the nozzle to the opening end on the upstream side of the mixing pipe, and flows into the mixing pipe while sucking in the primary air for combustion. Then, the mixed gas of the fuel gas and the primary air that has passed through the mixing pipe is ejected from the flame port, and when ignited by the spark plug, combustion is started and a flame is formed in contact with the flame port. In addition, a thermocouple is installed with the temperature measuring contact close to the flame port, and when the thermocouple is heated by a flame, a thermoelectromotive force is generated. Therefore, extinction is detected based on the disappearance of the thermoelectromotive force. Therefore, the supply of fuel gas is cut off.

In such a stove burner, abnormal combustion of the supplied fuel gas may occur. For example, if the combustion speed becomes faster than the ejection speed of the mixed gas when adjusting (weakening) the thermal power of the control burner, the flame will sneak into the inside of the control burner from the flame port, and the fuel gas injected from the nozzle will enter the mixing pipe. A burning phenomenon (hereinafter referred to as flashback) may occur. In addition, when the flame port is blocked by boiling spills from the cooking container, fuel gas leaks from the opening end side of the mixing pipe, and the leaked fuel gas ignites and a flame is ejected from the opening end (hereinafter, (Reverse injection) may occur. Even if a flashback or a flashback occurs, some of the multiple flame ports may be maintained with the flame out, and the flame heats the thermocouple for extinguishing detection. If so, the fuel gas supply will continue.

Therefore, in order to detect a flashback or a flashback, it has been proposed to install a temperature detector such as a thermocouple near the open end of the mixing pipe (Patent Document 1). When a flashback or a flashback occurs, the temperature near the end of the mixing pipe rises, so abnormal combustion can be stopped by shutting off the fuel gas supply based on the temperature rise in the temperature detector. ..

Japanese Unexamined Patent Publication No. 2003-28428

However, with a gas stove, it may be difficult to secure a space for installing a temperature detector near the open end of the mixing pipe, and a new dedicated temperature detector has been added to detect flashback and backfight. There is a problem that the manufacturing cost of the gas stove increases due to the addition.

The present invention has been made in response to the above-mentioned problems in the prior art, and it is possible to detect abnormal combustion such as flashback or flashback without adding a new dedicated temperature detector. The purpose is to provide a gas stove.

In order to solve the above-mentioned problems, the gas stove of the present invention has adopted the following configuration. That is,
A burner main body having a plurality of flame ports and a control burner including a mixing pipe extending from the burner main body are mounted, and fuel gas supplied through a gas passage is sent from a nozzle to the opening end of the mixing pipe. When injected, a mixed gas of the fuel gas and the primary air is ejected from the flame port through the mixing pipe, and the mixed gas is ignited and burned in a gas stove.
A thermocouple installed with the temperature measuring contact close to the flame port,
A determination unit that acquires the thermoelectromotive force generated in the thermocouple and determines whether or not the value of the thermoelectromotive force is within the normal range from a predetermined lower limit value to the upper limit value.
Abnormal combustion of the fuel gas is detected based on the determination by the determination unit that the value of the thermoelectromotive force is smaller than the lower limit value or the value of the thermoelectromotive force is larger than the upper limit value. It is characterized in that it is provided with a detection unit.

The stove burner is generally equipped with a thermocouple in a state where the temperature measuring contact is close to the flame port in order to detect extinction, and the thermocouple is no longer heated by the flame and the thermoelectromotive force is lost. It is possible to detect extinction based on. In the gas stove of the present invention, it is determined whether or not the thermoelectromotive force value of this thermocouple is within the normal range, and based on the thermoelectromotive force value deviating from the normal range, flashback or reverse fire or reverse It is possible to detect abnormal combustion such as a jet. And, by diverting the existing thermocouple to detect the extinction and detecting abnormal combustion in this way, it is not necessary to add a new temperature detector to detect backfire and backjection. Therefore, it is not necessary to secure a space for installing the temperature detector near the opening end of the mixing pipe whose temperature rises due to the occurrence of flashback or backspout, and it is possible to reduce the manufacturing cost of the gas stove. ..

In the gas stove of the present invention described above, the thermal power of the stove burner can be adjusted by changing the flow rate of the fuel gas supplied to the stove burner, and the lower limit value and the upper limit value of the normal range are set according to the thermal power of the stove burner. It may be set.

By doing so, it is possible to narrow down the normal range while suppressing false detections that deviate from the normal range due to the difference in thermoelectromotive force generated in the thermocouple according to the thermal power of the stove burner. It is possible to improve the detection accuracy of.

It is a perspective view which shows the appearance of the gas stove 1 of this Example. It is a vertical sectional view which showed the structure of the stove burner 5. It is a block diagram for controlling combustion in a stove burner 5. It is a flowchart of the abnormal combustion detection process which the controller 40 of this Example executes in order to detect the abnormal combustion of a fuel gas. It is a flowchart of the normal range setting process executed in the abnormal combustion detection process. It is explanatory drawing which showed the example which the value of the thermoelectromotive force of a thermocouple 30 deviates from a normal range by abnormal combustion such as a flashback fire and a flashback jet. It is explanatory drawing which showed the example which detects the abnormal combustion in the stove burner 5 according to the abnormal combustion detection processing.

FIG. 1 is a perspective view showing the appearance of the gas stove 1 of this embodiment. The gas stove 1 of this embodiment includes a box-shaped stove main body 2 having an opening on the upper surface side, and a top plate 3 installed so as to cover the upper surface of the stove main body 2. Two stove burners 5 for burning fuel gas are installed on the left and right sides of the stove main body 2, and the upper portion of the stove burner 5 projects from an insertion hole formed in the top plate 3. Further, on the top plate 3, a trivet 6 for placing a cooking container such as a pot above the stove burner 5 is installed surrounding the stove burner 5.

A grill door 7 is provided on the front surface of the gas stove 1 so that the front of the grill built in the stove body 2 can be opened and closed. On the right side of the grill door 7, a stove operation button 8 that the user operates at the time of ignition, extinguishing, or adjusting the heating power is provided corresponding to each of the two stove burners 5. Further, on the left side of the grill door 7, a grill operation button 9 is provided which is operated by the user when the grill is ignited, extinguished, or adjusted in heat power.

FIG. 2 is a vertical cross-sectional view showing the structure of the stove burner 5. As described above, the upper portion of the stove burner 5 protrudes from the insertion hole 4 formed in the top plate 3. The stove burner 5 includes a burner body 10 in which a ring-shaped mixing chamber 10a is formed, a mixing pipe 11 communicating with the mixing chamber 10a and extending from the burner body 10, and an opening on the upper surface of the mixing chamber 10a. A ring-shaped burner head 12 mounted on the burner body 10 so as to cover the burner body 10, a ring-shaped burner cover 14 mounted above the burner head 12 with a mounting bracket (not shown), and the like are provided.

A nozzle 21 connected to a gas passage 20 for supplying fuel gas is installed at the open end 11a of the mixing pipe 11 extending from the burner body 10. The gas passage 20 is provided with a gas shutoff valve 22 for opening and closing the gas passage 20 and a flow rate control valve 23 for adjusting the flow rate of fuel gas passing through the gas passage 20. When the gas shutoff valve 22 and the flow control valve 23 are opened, the fuel gas is supplied to the nozzle 21 through the gas passage 20, and the fuel gas injected from the nozzle 21 is sucked into the mixing pipe 11 while sucking the primary air for combustion. Inflow. Then, the fuel gas passing through the mixing pipe 11 and the primary air are mixed, and the mixed gas is supplied to the mixing chamber 10a.

In the burner head 12, a cylindrical outer peripheral wall 12a extends downward from the ring-shaped outer edge portion, and a cylindrical inner peripheral wall 12b longer than the outer peripheral wall 12a extends downward from the inner edge portion. It is installed. A plurality of grooves 12d are formed radially with respect to the center of the burner head 12 on the lower surface of the outer peripheral wall 12a (the surface mounted on the burner body 10). When the burner head 12 is placed on the burner body 10, the upper surface opening of the mixing chamber 10a is covered, and a plurality of flames communicating with the mixing chamber 10a by the plurality of grooves 12d of the outer peripheral wall 12a and the upper surface of the burner body 10 The mouth 13 is formed. The burner body 10 and the burner head 12 of this embodiment correspond to the "burner main body" of the present invention.

When the mixed gas supplied to the mixing chamber 10a is ejected from a plurality of flame ports 13 and sparks are blown by spark plugs (not shown), combustion of the mixed gas is started and the outside of the flame ports 13 in the radial direction of the burner head 12 is started. By forming a flame (around the outer peripheral wall 12a), the cooking container placed on the Gotoku 6 is heated. The thermal power (heat amount) of the stove burner 5 can be changed by controlling the opening degree (fuel gas supply amount) of the flow rate control valve 23. Further, the stove burner 5 includes a thermocouple 30, and the temperature measuring contact at the tip of the thermocouple 30 is located close to one of the flame ports 13 and outside the burner head 12 in the radial direction. When the tip of the thermocouple 30 is heated by the flame of the stove burner 5, a thermoelectromotive force is generated. Therefore, based on the disappearance of the thermoelectromotive force, the extinction (not burning) of the stove burner 5 is detected. It is possible to do.

The upper part of the burner head 12 is covered with the burner cover 14, and even if the spilled juice is spilled from the cooking container on the trivet 6, the spilled juice can be prevented from being applied to the burner head 12. A temperature sensor 32 is inserted inside the inner peripheral wall 12b of the burner head 12, and the upper part of the temperature sensor 32 projects from the through hole 14a of the burner cover 14. The temperature sensor 32 is urged upward by an urging spring (not shown), and the upper end of the temperature sensor 32 abuts on the lower surface of the cooking container placed on the trivet 6 to detect the temperature of the cooking container.

FIG. 3 is a block diagram for controlling combustion in the stove burner 5. The gas stove 1 of this embodiment is equipped with a controller 40 that controls combustion in the stove burner 5. The stove operation button 8, the gas shutoff valve 22, the flow rate control valve 23, the thermocouple 30, and the temperature sensor 32 are electrically connected to the controller 40.

When the stove operation button 8 is operated by the user for adjusting the thermal power, the controller 40 drives a stepping motor (not shown) built in the flow rate control valve 23 to control the opening degree of the flow rate control valve 23. The thermal power of the stove burner 5 is changed by changing the flow rate of the fuel gas supplied to the stove burner 5. The flow rate control valve 23 of this embodiment corresponds to the "control section" of the present invention. When the temperature sensor 32 detects overheating of the cooking container, the controller 40 closes the gas shutoff valve 22 to shut off the supply of fuel gas, thereby forcibly stopping combustion.

Further, the controller 40 of the present embodiment can detect not only ignition failure and extinguishing of the stove burner 5 but also abnormal combustion of fuel gas based on the thermoelectromotive force of the thermocouple 30. be. As an abnormal combustion, for example, when the ejection speed of the mixed gas is lower than the combustion speed when adjusting the thermal power of the burner 5, or when the burner head 12 is tilted with respect to the burner body 10, the flame is emitted from the flame port 13. A phenomenon (hereinafter referred to as flashback) may occur in which the fuel gas injected from the nozzle 21 burns in the mixing pipe 11 by sneaking into the inside of the control burner 5. Further, when the flame port 13 is blocked by a boiling spill from the cooking container on Gotoku 6, the fuel gas injected from the nozzle 21 leaks from the opening end 11a of the mixing pipe 11 and becomes the leaked fuel gas. A phenomenon in which a flame ignites and a flame is ejected from the opening end 11a (hereinafter referred to as a reverse injection) may occur. Then, even if a flashback or a flashback occurs, the flame may be maintained at any of the flame ports 13 among the plurality of flame ports 13, and the tip of the thermocouple 30 is heated by the flame. If so, a thermoelectromotive force is generated in the thermocouple 30.

The controller 40 of this embodiment has a determination unit 41 that acquires the thermoelectromotive force generated by the thermocouple 30 and determines whether or not the thermoelectromotive force value (voltage value) is within the normal range, and the thermoelectromotive force. Based on the determination by the determination unit 41 that the value of is not within the normal range, the detection unit 42 for detecting abnormal combustion of the fuel gas is built-in. Then, when abnormal combustion is detected, the controller 40 stops combustion by closing the gas shutoff valve 22. Further, when the thermal power of the stove burner 5 changes, the thermoelectromotive force generated in the thermocouple 30 changes. Therefore, the controller 40 has a setting unit 43 that sets a normal range of the thermoelectromotive force according to the thermal power of the stove burner 5. Is built-in.

FIG. 4 is a flowchart of the abnormal combustion detection process executed by the controller 40 of this embodiment in order to detect the abnormal combustion of the fuel gas. This process is started when the user performs an ignition operation on the stove operation button 8. In the abnormal combustion detection process, first, it is determined whether or not a predetermined sampling time (20 seconds in this embodiment) has elapsed (STEP100). In the gas stove 1 of this embodiment, the thermoelectromotive force of the thermocouple 30 is acquired every time the sampling time elapses, and if the sampling time has not elapsed yet (STEP100: no), the sampling time elapses. It will be in a standby state until it is done.

After that, when the sampling time elapses (STEP100: yes), the thermoelectromotive force of the thermocouple 30 is acquired (STEP102), and it is determined whether or not the acquired thermoelectromotive force value is equal to or less than a predetermined threshold value E0. (STEP104). When the value of the thermoelectromotive force is equal to or less than the threshold value E0 (STEP104: yes), it is determined that the tip of the thermocouple 30 is not heated by the flame and ignition is defective or extinguished, and the gas shutoff valve 22 is closed. After the valve is valved (STEP106), the abnormal combustion detection process of FIG. 4 is terminated.

On the other hand, when the value of the thermoelectromotive force is larger than the threshold value E0 (STEP104: no), it is assumed that the tip of the thermocouple 30 is heated by the flame, and the normal range of the thermoelectromotive force is set (hereinafter, normal). Range setting process) is executed (STEP108).

FIG. 5 is a flowchart of the normal range setting process executed in the abnormal combustion detection process. In the normal range setting process, first, the set thermal power of the stove burner 5 is acquired (STEP120). As described above, the thermal power of the stove burner 5 can be changed by controlling the opening degree of the flow rate control valve 23 according to the operation of the stove operation button 8 by the user, and the stove burner of the present embodiment can be changed. In 5, it is set from three stages of thermal power: large, medium, and small.

After acquiring the set thermal power of the stove burner 5, it is determined whether or not the acquired set thermal power is "small" (STEP122). Then, when the set thermal power of the stove burner 5 is "small" (STEP122: yes), the normal range is set from E1 to E2 (STEP124). E1 of this embodiment has a value larger than the above-mentioned threshold value E0.

On the other hand, if the set thermal power of the stove burner 5 is not "small" (STEP 122: no), then it is determined whether or not the set thermal power of the stove burner 5 is "medium" (STEP 126). Then, when the set thermal power of the stove burner 5 is "medium" (STEP126: yes), the normal range is set from E3 to E4 (STEP128). E3 in this embodiment has a larger value than E2 described above, and the width from E3 to E4 is wider than the width from E1 to E2.

On the other hand, if the set thermal power of the stove burner 5 is not "medium" (STEP126: no), the set thermal power of the stove burner 5 is "large", so the normal range is set from E5 to E6. (STEP130). E5 in this embodiment has a larger value than E4 described above, and the width from E5 to E6 is wider than the width from E3 to E4. After setting the normal range of the thermoelectromotive force according to the set thermal power of the stove burner 5 in this way, the normal range setting process of FIG. 5 is terminated, and the process returns to the abnormal combustion detection process of FIG.

In the abnormal combustion detection process, when returning from the normal range setting process (STEP108), it is determined whether or not the thermoelectromotive force value of the thermocouple 30 acquired in STEP102 is within the normal range set in STEP108 (STEP110). ). Then, when the value of the thermoelectromotive force is within the normal range (STEP110: yes), it is determined that the combustion in the stove burner 5 is normal, and then the user performs a fire extinguishing operation on the stove operation button 8. By doing so, it is determined whether or not the combustion in the stove burner 5 is stopped (STEP112).

If combustion is still continuing (STEP112: no), the process returns to STEP100, and when the sampling time elapses, the thermoelectromotive force of the thermocouple 30 is acquired again, and the subsequent processing described above is repeated. On the other hand, when the combustion in the stove burner 5 is stopped by the fire extinguishing operation on the stove operation button 8 (STEP112: yes), the abnormal combustion detection process of FIG. 4 is terminated.

On the other hand, in the judgment of STEP110, if the thermoelectromotive force value is smaller than the lower limit value of the normal range or the thermoelectromotive force value is larger than the upper limit value of the normal range (STEP110: no), the above-mentioned flashback or the above-mentioned flashback or After determining that the combustion is abnormal such as back injection and forcibly stopping the combustion by closing the gas shutoff valve 22 (STEP106), the abnormal combustion detection process of FIG. 4 is terminated. When abnormal combustion is detected, the countermeasure is not limited to closing the gas shutoff valve 22, and for example, the user may be notified of abnormal combustion by issuing a predetermined alarm.

FIG. 6 is an explanatory diagram showing an example in which the value of the thermoelectromotive force of the thermocouple 30 deviates from the normal range due to abnormal combustion such as flashback or flashback. In the figure, the cross section of the flame port (hereinafter, TC flame port) 13a in which the tips of the thermocouples 30 are close to each other among the plurality of flame ports 13 is enlarged and shown. First, FIG. 6A shows a state of normal combustion. In the illustrated example, the flame formed on the outer side of the burner head 12 in the radial direction in contact with the TC flame port 13a. The tip of the thermocouple 30 is located in the flame portion. Therefore, a thermoelectromotive force is generated in the thermocouple 30 according to the temperature of the internal flame. Then, the normal range is defined so that the value of the thermoelectromotive force at this time is included.

On the other hand, when abnormal combustion such as a flashback or a flashback occurs, the fuel gas burns in the mixing pipe 11 or the fuel gas leaking from the opening end 11a burns as described above, so that the TC The shape of the flame emitted from the flame port 13a changes. For example, as shown in FIG. 6 (b), the flame emitted from the TC flame port 13a may be smaller than that in the normal combustion state of FIG. 6 (a), and the example shown in FIG. 6 (b). Then, the tip of the thermocouple 30 is located at the outer flame portion of the flame. In general, flames tend to have a higher temperature of the outer flame than the inner flame, and the thermocouple 30 generates a thermoelectromotive force according to the temperature of the outer flame, so that the thermoelectromotive force value is the upper limit of the normal range. May be higher than.

Further, as shown in FIG. 6C, the tip of the thermocouple 30 may be located outside the outer flame because the flame emitted from the TC flame port 13a becomes smaller. Even in this case, since the tip of the thermocouple 30 receives heat from the flame, a thermoelectromotive force is generated in the thermocouple 30, but the temperature of the outside of the outer flame tends to be lower than that of the inner flame. The value may be lower than the lower limit of the normal range.

Further, when an abnormal combustion such as a flashback or a flashback occurs and no flame is formed at the TC flame port 13a, the tip of the thermocouple 30 is not heated, so that the value of the thermoelectromotive force of the thermocouple 30 naturally increases. It is lower than the lower limit of the normal range. Moreover, when the value of the thermoelectromotive force becomes equal to or less than the threshold value E0, the gas shutoff valve 22 is closed as in the case of ignition failure or extinguishing, so that abnormal combustion can be stopped.

Note that FIG. 6 shows an example, and even if abnormal combustion occurs, the flame does not always become smaller. For example, among a plurality of flame ports 13, some flame ports other than the TC flame port 13a When 13 is blocked by boiling spills or the like, the flame emitted from the unblocked TC flame port 13a may become large. Further, since the normal range is determined based on the positional relationship between the flame formed in contact with the TC flame port 13a in the normal combustion state and the tip of the thermoelectric pair 30, for example, in the normal combustion state, the figure is shown. Assuming that the tip of the thermoelectric pair 30 is located in the outer flame part of the flame as shown in 6 (b), the flame becomes large and the inside of the flame becomes large as shown in FIG. 6 (a) in an abnormal combustion state. By locating the tip of the thermocouple 30 in the flame portion, the thermomotive force value may be lower than the lower limit of the normal range.

FIG. 7 is an explanatory diagram showing an example of detecting abnormal combustion in the stove burner 5 according to the abnormal combustion detection process. In the graph of FIG. 7, the horizontal axis represents the elapsed time from ignition and the vertical axis represents the thermoelectromotive force of the thermocouple 30, and the change in thermoelectromotive force in a normal combustion state is shown by a solid line. The change in thermoelectromotive force in an abnormal combustion state such as back injection is shown by a broken line. Further, in the stove burner 5 of this embodiment, the change in thermoelectromotive force at each thermal power is shown corresponding to the fact that the thermal power can be set from three stages of large, medium and small.

When the stove burner 5 is ignited, a flame is formed on the outside of the flame port 13 in the radial direction of the burner head 12, and the tip of the thermocouple 30 is heated by the flame, so that the thermoelectromotive force rises sharply. Generally, the thermocouple 30 has a quick response to a temperature change at the tip (temperature measuring contact), and when it stabilizes in a normal combustion state, the value of the thermoelectromotive force becomes almost constant. Then, as described above, the thermoelectromotive force is acquired every time a predetermined sampling time Δt (20 seconds in this embodiment) elapses from ignition, and this sampling time Δt is the response time of the thermocouple 30. It is set longer than (for example, 10 seconds). In the case of ignition failure or extinguishing, since the tip of the thermocouple 30 is not heated by the flame, it can be detected based on the value of the thermoelectromotive force being equal to or less than the threshold value E0.

Further, the thermoelectromotive force of the thermocouple 30 in the normal combustion state depends on the positional relationship between the flame formed in contact with the TC flame port 13a and the tip of the thermocouple 30, and depends on the thermal power of the controller 5. Since the shape (size) of the flame changes, the value of thermoelectromotive force also differs. Corresponding to this, the normal range of thermoelectromotive force is set for each thermal power of the stove burner 5, the normal range of "small" thermal power is set from E1 to E2, and the normal range of thermal power is "medium". The range is set from E3 to E4, and the normal range with "large" firepower is set from E5 to E6. Then, if the normal combustion state is maintained, the value of the thermoelectromotive force remains substantially constant and does not deviate from the normal range.

On the other hand, when abnormal combustion such as flashback or reverse jet occurs, the flame is not formed at the TC flame port 13a, or even if the flame is emitted from the TC flame port 13a, the shape of the flame changes from the normal combustion state. By doing so, the value of thermoelectromotive force changes. Therefore, abnormal combustion of the fuel gas is detected based on the value of the thermoelectromotive force acquired every time the sampling time Δt elapses, which is smaller than the lower limit of the normal range or larger than the upper limit of the normal range. Can be done.

As described above, in the gas stove 1 of the present embodiment, based on the thermoelectromotive force of the thermocouple 30, not only the ignition failure and extinction in the stove burner 5 are detected, but also abnormal combustion is detected. ing. The stove burner 5 is generally provided with a thermocouple 30 in order to detect ignition failure or extinguishing. In the conventional gas stove 1, the thermoelectromotive force generated by heating the thermocouple 30 with a flame is generated. The gas shutoff valve 22 is kept open by the electromagnetic coil, and in the case of ignition failure or extinguishing, the thermocouple 30 is not heated and no thermoelectromotive force is generated, so that the gas shutoff valve 22 is closed. It is designed to do. Therefore, even if a flashback or a flashback occurs, if the flame is maintained as it is emitted from the TC flame port 13a, abnormal combustion is continued without being detected. On the other hand, in the gas stove 1 of this embodiment, it is determined whether or not the thermoelectromotive force value of the thermocouple 30 is within the normal range, and the thermoelectromotive force value is out of the normal range. Based on this, it is possible to detect abnormal combustion such as flashback or flashback.

Then, in this way, the existing thermocouple 30 for detecting ignition failure and extinguishing is diverted to detect abnormal combustion such as backfire and backspout, thereby detecting backfire and backspout. Since it is not necessary to add a new temperature detector, it is not necessary to secure a space for installing the temperature detector near the opening end 11a of the mixing pipe 11 whose temperature rises due to the occurrence of flashback or backfire. It is possible to reduce the manufacturing cost of the gas stove 1.

Further, in the gas stove 1 of this embodiment, the lower limit value and the upper limit value of the normal range of the thermoelectromotive force are set according to the thermal power of the stove burner 5. By doing this, it is possible to narrow down the normal range while suppressing false detections that deviate from the normal range due to the difference in thermoelectromotive force for each thermal power, so it is possible to improve the detection accuracy of flashbacks and flashbacks. Become.

Although the gas stove 1 of the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and can be carried out in various modes without departing from the gist thereof.

For example, in the above-described embodiment, the larger the thermal power of the controller 5, the larger the thermoelectromotive force value of the thermocouple 30 in the normal combustion state (see FIG. 7). The "large" normal range (E5 to E6) is set to the side where the thermoelectromotive force is larger than the normal range (E3 to E4) of the thermal power "medium", and the normal range of the thermal power "medium" (E3 to E4). Up to) was set to the side where the thermoelectromotive force was larger than the normal range (from E1 to E2) of the thermal power "small". However, as described above, the thermoelectromotive force of the thermocouple 30 in the normal combustion state depends on the positional relationship between the flame formed in contact with the TC flame port 13a and the tip of the thermocouple 30, and the controller 5 has. Even if the thermal power increases, the value of the thermoelectromotive force of the thermocouple 30 does not necessarily increase, so that the order of the normal range may be changed.

Further, in the above-described embodiment, the heating power of the stove burner 5 can be set from three stages of large, medium, and small, but the heating power is not limited to the three stages as long as the heating power can be changed. .. Further, the normal range of the thermoelectromotive force may be set so as to include the value of the thermoelectromotive force of the thermocouple 30 in the normal combustion state for each thermal power of the stove burner 5, and one of the normal ranges with different thermal powers. The parts may overlap.

Further, in the stove burner 5 of the above-described embodiment, the flame port 13 is opened on the outer peripheral surface of the ring-shaped burner body (burner head 12 and burner body 10), and the flame port 13 is outward from the flame port 13 in the radial direction of the burner body. It was explained as an external flame type burner in which a flame is formed toward the burner. However, even in the case of an internal flame type burner in which a flame port 13 is opened on the inner peripheral surface of the ring-shaped burner body and a flame is formed from the flame port 13 toward the inside in the radial direction of the burner body, the present invention is used. Can be preferably applied. In the case of an internal flame type burner, the thermocouple 30 may be installed so that the temperature measuring contact at the tip is close to the flame port 13 and located inside the burner body in the radial direction.

1 ... gas stove, 2 ... stove body, 3 ... top plate,
4 ... Insertion hole, 5 ... Stove burner, 6 ... Gotoku,
8 ... stove operation button, 10 ... burner body, 10a ... mixing chamber,
11 ... Mixing tube, 11a ... Open end, 12 ... Burner head,
12a ... Outer wall, 12b ... Inner wall, 12d ... Groove,
13 ... Flame mouth, 13a ... TC flame mouth, 14 ... Burner cover,
14a ... through hole, 20 ... gas passage, 21 ... nozzle,
22 ... Gas shutoff valve, 23 ... Flow control valve, 30 ... Thermocouple,
32 ... Temperature sensor, 40 ... Controller, 41 ... Judgment unit,
42 ... Detection unit, 43 ... Setting unit.

Claims (2)

A burner main body having a plurality of flame ports and a control burner including a mixing pipe extending from the burner main body are mounted, and fuel gas supplied through a gas passage is sent from a nozzle to the opening end of the mixing pipe. When injected, a mixed gas of the fuel gas and the primary air is ejected from the flame port through the mixing pipe, and the mixed gas is ignited and burned in a gas stove.
A thermocouple installed with the temperature measuring contact close to the flame port,
A determination unit that acquires the thermoelectromotive force generated in the thermocouple and determines whether or not the value of the thermoelectromotive force is within the normal range from a predetermined lower limit value to the upper limit value.
Abnormal combustion of the fuel gas is detected based on the determination by the determination unit that the value of the thermoelectromotive force is smaller than the lower limit value or the value of the thermoelectromotive force is larger than the upper limit value. A gas stove characterized by being equipped with a detection unit. In the gas stove according to claim 1,
An adjusting unit that can adjust the thermal power of the stove burner by changing the flow rate of the fuel gas supplied to the stove burner.
A gas stove comprising a setting unit for setting the lower limit value and the upper limit value in the normal range according to the thermal power of the stove burner adjusted by the adjusting unit.

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