JP2006136584A - Grill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly detect an misfire of an afterburner. <P>SOLUTION: A grill 5 of an embodiment 1 is so formed as to change the length and the thickness of a third conductor 34 of a thermocouple 27y for the afterburner 9 relative to those of the third conductor 34 of a thermocouple 27x for a cooking burner 8, increase a resistance to set a back electromotive force of the thermocouple 27y for the afterburner at a second connecting point 36 larger than that of a cooking thermocouple 27x. This constitution can quickly reduce the thermoelectromotive force to an misfire detecting level and promptly cut off the feed of fuel gas even in the afterburner part which is provided in an exhaust passage of the afterburner 8 and where the temperature is hard to decrease in the misfire. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a grill provided with an afterburner for purifying smoke generated from an object to be cooked.

2. Description of the Related Art Conventionally, there is known a grill that purifies smoke generated from an object to be cooked by an afterburner provided in an exhaust passage to make it odorless and smokeless (Patent Document 1). In such an odorless smokeless grill, the afterburner burns simultaneously with the cooking burner, and the smoke is always purified by the afterburner during cooking.
The above-described gas burning appliance such as a grill is provided with a safety device that prevents the release of raw gas by cutting off the supply of fuel gas when the flame goes out. Specifically, when the thermoelectromotive force generated from a thermocouple installed in the vicinity of a cooking burner or afterburner exceeds a predetermined value, the magnet coil of the magnet safety valve is energized and adsorbed as if there is ignition, and held below the predetermined value. In this case, the gas passage is shut off by stopping energization because of misfire.

In addition, recently, as a thermocouple of the safety device as described above, apart from the main electromotive portion that generates thermoelectromotive force by heating by burning of the burner, the thermoelectromotive force in the direction opposite to this main electromotive portion is used. What uses what is called a counter electromotive force type thermocouple provided with the counter electromotive part to generate | occur | produce is known. In such a counter electromotive force type thermocouple, the sum of the thermoelectromotive forces of the main electromotive portion and the counter electromotive portion when the burner is extinguished rapidly decreases. Furthermore, since the combined electromotive force in the steady state is also reduced, the combined electromotive force is quickly reduced in the event of a misfire, and the fuel supply path to the burner can be quickly cut off (see, for example, Patent Document 2).
Japanese Patent No. 2612826 JP 2003-279038 A

However, in the odorless smokeless grill described above, since the afterburner is provided in the exhaust passage, there is a problem that the afterburner thermocouple continues to be heated by the exhaust heat from the cooking burner even if the flame goes out. is there. For this reason, even if the same back electromotive force type thermocouple as the cooking burner thermocouple is used as the afterburner thermocouple, the thermoelectromotive force cannot be lowered to the misfire detection level.
The grill of this invention solves the said subject and aims at detecting the misfire of an afterburner rapidly.

The grill according to claim 1 of the present invention that solves the above problems is provided.
A cooking burner that heats the food in the grill;
An afterburner for purifying smoke provided in an exhaust passage for smoke generated from the food;
A cooking burner thermocouple whose thermoelectromotive force changes depending on the combustion state of the cooking burner;
An afterburner thermocouple whose thermoelectromotive force varies depending on the combustion state of the afterburner,
Cooking burner misfire detection means for detecting misfire of the cooking burner by electromotive force from the cooking burner thermocouple;
An afterburner misfire detecting means for detecting misfire of the afterburner by an electromotive force from the afterburner thermocouple,
The cooking burner thermocouple and the afterburner thermocouple each generate an electromotive force generated by combustion of the cooking burner or the afterburner, and an electromotive force in the opposite direction to the main electromotive portion. In the grill which is a counter electromotive force type thermocouple having a counter electromotive portion,
The ratio of the counter electromotive force generated in the counter electromotive force to the electromotive force generated in the main electromotive force in the afterburner thermocouple The main point is that the ratio is larger than the ratio of the counter electromotive force generated in step (b).

In the grill according to claim 1 of the present invention having the above-described configuration, the cooking burner misfire detecting means detects misfire of the cooking burner due to a decrease in the thermoelectromotive force of the cooking burner thermocouple, and the afterburner misfire detecting means is the afterburner thermocouple. Afterburner misfire is detected by lowering the thermoelectromotive force. In order to quickly reduce the thermoelectromotive force, a counter electromotive force type thermocouple is used as both the cooking burner thermocouple and the afterburner thermocouple.
Furthermore, the sum of the back electromotive force of the afterburner thermocouple (synthetic electromotive force) is set by setting the ratio of the back electromotive force generated by the afterburner thermocouple to be larger than the ratio of the back electromotive force generated by the cooking burner thermocouple. Can be further promptly reduced. Also, the combined electromotive force in the steady state can be suppressed to a low level. As a result, even in the afterburner portion where the temperature is unlikely to decrease during a misfire because it is provided in the exhaust passage of the cooking burner, the thermoelectromotive force is quickly reduced to the misfire detection level, and the misfire can be reliably detected.

  In order to further clarify the configuration and operation of the present invention described above, preferred embodiments of the grill of the present invention will be described below.

FIG. 1 is a schematic perspective view of a gas built-in stove equipped with a gas grill as one embodiment, and FIG. 2 is a schematic side sectional view of the gas grill.
A built-in stove 1 shown in FIG. 1 is incorporated in a kitchen counter, and includes two sets of a stove part 4 facing a stove burner 3 from left and right openings of a top plate 2 and a grill 5 provided at the center of the main body. Prepare.
The front of the main body is provided with a grill door 6 for taking in and out an object to be cooked F such as fish in the center, and further, on both sides thereof, a fire extinguishing button 7 for igniting / extinguishing two sets of stove parts 4, respectively. A fire extinguishing button 10 for simultaneously igniting / extinguishing a cooking burner 8 of the grill 5 and an afterburner 9 described later, and a grill display unit for setting and displaying a combustion time timer of the grill 5 and displaying a misfire error of the grill 5 11.

As shown in FIG. 2, the grill 5 includes a grill box 12 that houses the cooking object F to form a combustion space, and an upper burner that is provided on both the upper left and right sides of the grill box 12 to heat the cooking object F from above. 8a, a lower burner 8b that is provided on the lower left and right sides of the grill cabinet 12, and heats the cooking object F from below, and a fire transfer burner that performs a fire transfer between the upper burner 8a and the lower burner 8b on the left and right sides of the grill cabinet 12 8c, a grill 13 on which the cooking object F is placed in the middle of the grill cabinet 12, a soup pan 14 that supports the grill 13 and receives oil falling from the cooking F, and a lower part of the grill door 6 And a grill handle 15 to which a soup saucer 14 is connected. The upper burner 8a, the lower burner 8b, and the transfer burner 8c correspond to the cooking burner in the present invention.
In the following description, when not distinguishing the upper, lower, left, and right burners, they are simply called the cooking burner 8, and when distinguishing between the left and right, L or R is added to the end of the code.

Behind the grill cabinet 12, there is provided an exhaust duct 16 that communicates with the lower portion of the rear surface 12a of the grill cabinet 12 to exhaust the exhaust outside the appliance. The exhaust duct 16 includes a vertical duct 16a formed in the vertical direction at the back of the grill cabinet 12, and an inclined duct 16b inclined upward from the upper end of the vertical duct 16a, and an exhaust port 17 is formed at the rear end thereof. . On the upper inclined surface 18 of the inclined duct 16b, a surface combustion type afterburner 9 having a combustion surface directed into the duct is provided. The afterburner 9 burns and eliminates smoke generated from the food F to be odorless and smokeless (purification of smoke).
The exhaust port 17 is provided facing the exhaust opening 19 formed in the top plate 2, and the catalyst filter 20 is mounted therein. The catalyst filter 20 is a heat-resistant ceramic plate having a plurality of openings, on which an oxidation catalyst such as platinum is supported, is provided so as to cover the entire passage of the exhaust port 17, and is provided in the vicinity of the exhaust upstream side. Further, it is activated by being heated by the afterburner 9, and when smoke passes through the catalyst filter 20, it is oxidized to make odorless and smokeless.
In the figure, reference numeral 21 denotes an exhaust cap that is attached to the exhaust opening 19 of the top plate 2 and prevents entry of dust or the like.

Next, a configuration for controlling ignition / extinguishing of the grill 5 will be described with reference to FIG.
The gas piping disposed in the appliance is provided with a magnet safety valve 22 and a main valve 23 from the upstream side, and branches downstream from the gas supply path to the left cooking burner 8L, the right cooking burner 8R, and the after burner 9. Is done. Therefore, when the magnet safety valve 22 and the main valve 23 are opened, the fuel gas is supplied to the cooking burner 8 and the afterburner 9 simultaneously.
The magnet safety valve 22 and the main valve 23 are opened and closed by a well-known push-push mechanism, and both valves are mechanically pushed by a push operation of the fire extinguisher button 10 to be opened. The main valve 23 is locked at the valve opening position by being released, and the magnet safety valve 22 is placed in a valve closeable state, but the valve coil is kept open by energization of the electromagnetic coil 24. By pressing again and releasing the hand, the main valve 23 is unlocked and the main valve 23 is closed.
Further, a cock switch 25 that is turned on only when the fire extinguishing button 10 is pushed is provided by using the advance / retreat of the push-push mechanism.

The left and right lower burners 8bL and 8bR detect cooking igniters 26xL and 26xR that ignite the fuel gas by spark discharge, and the left and right upper burners 8aL and 8aR are directly heated by the flame of the cooking burner 8 to detect the presence of flames. Cooking thermocouples 27xL and 27xR are provided, and the afterburner 9 is also provided with a similar igniter 26y (hereinafter referred to as after-igniter 26y) and a thermocouple 27y (hereinafter referred to as after-thermocouple 27y).
Here, the configuration of the thermocouple 27 will be described. The thermocouple 27 includes a main electromotive portion A that generates a thermoelectromotive force by heating due to combustion of the burners 8 and 9, and a counter electromotive portion B that generates a thermoelectromotive force opposite to the main electromotive portion A. Is a back electromotive force type thermocouple. If the cooking burner 8 and the afterburner 9 are not distinguished, they are simply referred to as a thermocouple 27, and when distinguished, x or y is added to the end of the code.
As shown in FIG. 4, the thermocouple 27 includes a rod-shaped second conductor 33 (for example, a dissimilar metal) in a cylindrical first conductor 32 (for example, Inconel) that becomes thinner toward the tip. 1st connection point 35 is formed by inserting both ends. The other end of the rod-shaped second conductor 33 is connected to another rod-shaped third conductor 34 (for example, chromel) made of a different metal, thereby forming a second connection point 36. The second conductor 33 and the third conductor 34 are covered with a glass tube 40.

The cylindrical first conductor 32 is fixed to the tip of a cylindrical brass electrode holder 37, and the second conductor 33 and the third conductor 34 are inserted through the electrode holder 37. . A lead wire 38 is connected to the outside of the electrode holder 37, and the other lead wire 39 is connected to the third conductor 34 inside the electrode holder 37.
The thermocouple 27 is arranged at a position where the first connection point 35 is the tip and is directly heated by the flame of the burners 8 and 9 to be detected, and the second connection point 36 is separated from the flame of the burners 8 and 9. Placed in a different position. The thermoelectromotive force generated at the second connection point 36 is opposite in polarity to the thermoelectromotive force generated at the first connection point 35, and the thermoelectromotive force at the second connection point 36 is higher than that of the first connection point 35. Configured to be smaller. Accordingly, the first connection point 35 becomes the main electromotive portion A that generates the thermoelectromotive force by the combustion of the burners 8 and 9, and the second connection point 36 generates the electromotive force in the opposite direction to the main electromotive portion A. It becomes the counter electromotive part B.

Next, the characteristics of the thermocouple 27 will be described.
During combustion of the burners 8 and 9, the first connection point 35 is heated directly by the flame of the burners 8 and 9 and thus becomes very hot, but the second connection point 36 is considerably lower than that. The thermoelectromotive force generated at the first connection point 35 is sufficiently larger than the thermoelectromotive force generated at the second connection point 36. On the other hand, when the burners 8 and 9 are extinguished, the temperature of the first connection point 35 that has been directly heated by the flame of the burners 8 and 9 rapidly decreases, so the difference from the temperature of the second connection point 36 is The ratio of the back electromotive force at the second connection point 36 in the combined electromotive force of the thermocouple 27 as a whole is increased, and the combined electromotive force is drastically compared with the electromotive force at the first connection point 35 alone. descend. In this way, the electromotive force of the thermocouple 29 can be lowered quickly when the burners 8 and 9 are extinguished.
Furthermore, in the present invention, the length and thickness of the third conductor 34 of the thermocouple 27y for the afterburner 9 are made different from those of the third conductor 34 of the thermocouple 27x for the cooking burner 8.
For example, the third conductor 34 for the afterburner 9 is made longer than the third conductor 34 for the cooking burner 8 (for the cooking burner 8: for the afterburner 9 with respect to diameter 1.6 mm × length 17 mm: The third conductor 34 for the after burner 9 is made thinner than the third conductor 34 for the cooking burner 8 (for cooking burner 8: diameter 1.6 mm × length 17 mm). And for afterburner 9: diameter 1.2 mm × length 17 mm). That is, the electrical resistance of the third conductor 34 for the afterburner 9 is increased so that the back electromotive force at the second connection point 36 is larger than that of the thermocouple 27 x for the cooking burner 8.
Further, when the third conductor 34 is lengthened or the wire diameter is reduced, not only the electric resistance is increased, but also the third conductor 34 is connected to the second conductor 33 when the afterburner 9 is misfired. The temperature changes (decreases) greatly compared to the temperature on the connection side with the lead wire 39. For this reason, a back electromotive force becomes still larger and a synthetic | combination thermoelectromotive force falls quickly.

A controller 28 for controlling ignition / extinguishing of the grill 5 is provided in the main body.
The controller 28 is connected to the igniter 26, the thermocouple 27, the electromagnetic coil 24 of the magnet safety valve 22, and the cock switch 25 as well as the grill display unit 11 provided on the body front panel.
Further, when the thermoelectromotive force generated from the thermocouple 27 exceeds a predetermined value, it is determined that there is ignition, and the electromagnetic coil 24 of the magnet safety valve 22 is energized. When the thermoelectromotive force is below the predetermined value, misfire (non-ignition and misfire) occurs. And a drive circuit for stopping energization.
Furthermore, a cooking time timer is provided that starts counting down from the initial cooking time at the same time that the thermocouple 27 detects that there is ignition.

  The grill display unit 11 includes a display panel 29 composed of two 7-segment LEDs, a + switch 30 and a -switch 31. Then, simultaneously with the detection of ignition by the thermocouple 27, the initial cooking time is displayed on the display panel 29, and then the remaining time (minutes) of the cooking time timer corresponding to the passage of time is displayed. Further, the cooking time can be adjusted in minutes by the + switch 30 and the-switch 31.

Next, the smoke purification mechanism of the grill 5 will be described.
When the cooking burner 8 in the grill cabinet 12 starts burning by the ignition operation of the user, the high temperature exhaust gas generated by the combustion fills the grill cabinet 12 and heats the cooking object F. The combustion exhaust gas heats the cooking object F and then overflows into the exhaust duct 16 and is discharged from the grill cabinet 12. At this time, smoke generated from the cooking object F also flows into the exhaust duct 16 together with the exhaust gas.
The afterburner 9 burns and eliminates smoke and odor components contained in the exhaust gas, and heats and activates the catalyst filter 20 to enhance its purification function.
Smoke and odor components contained in the exhaust gas flowing through the exhaust duct 16 almost disappear when they come into contact with the flame of the afterburner 9, but may not be completely eliminated. Therefore, the remaining smoke and odor components are passed through the catalyst filter 20 and oxidized to realize odorless smokelessness.

Next, the control operation executed by the controller 30 of the grill 5 of this embodiment will be described with reference to the flowchart of FIG.
When the fire extinguishing button 10 is pressed, the main valve 23 and the magnet safety valve 22 are mechanically pushed open, and fuel gas flows into the cooking burner 8 and the afterburner 9, and at the same time, the igniters 26x and 26y spark and start combustion. (S1). The cooking heat couple 27x and the after thermocouple 27y are heated by this combustion heat to generate a thermoelectromotive force. The output voltage V (the output voltage of the cooking thermocouple 27 is V1, and the output voltage of the after thermocouple 29 is V2) is read, and each output voltage V is larger than a preset voltage Vs (for example, 2 mV). It is determined whether or not (S2). In the cooking thermocouple 27x, the left and right cooking burners 8L and 8R are provided as a left cooking thermocouple 27xL and a right cooking thermocouple 27xR, respectively, and each thermoelectromotive force is detected separately. If either one of the thermoelectromotive forces does not reach the set voltage Vs, the following control performs the process of V1 <Vs, and the process of V1> Vs is performed only when both the thermoelectromotive forces reach Vs.
Immediately after the start of ignition, V <Vs because of the heating delay of the thermocouples 27x and 27y (S2: NO), but when the thermocouples 27x and 27y are heated by combustion heat and V> Vs (S2: YES), The energization of the electromagnetic coil 24 is started (S3), the initial time 9 minutes of the cooking time timer is displayed on the display panel 31, and the countdown of the timer is started (S4).
The igniters 26x and 26y are stopped by releasing the hand from the fire extinguishing button 10 by the user, and the combustion is continued by holding the suction opening of the magnet safety valve 22.

If V1 <Vs or V2 <Vs (S2: NO), it is considered that the burner has not been ignited, and it is determined whether or not the cock switch 25 is OFF to confirm whether or not the ignition operation is continued. (S5, S6), when the cock switch 25 is OFF (S5: YES, S6: YES), it is considered that the ignition operation has ended, and “11” indicating an ignition failure error is displayed on the display panel 31 (S7, S8) To finish the operation. When the cock switch 25 is ON (S5: NO, S6: NO), it is considered that the ignition operation is continuing, and the process returns to step 2 to check the thermoelectromotive force V.
Here, when V1> Vs is satisfied in step 2, but V2 <Vs, that is, when misfire is detected earlier in the after thermocouple 29 (S2: V2 <Vs), ignition is performed. In order to determine that the failure has occurred in the afterburner 9 and to notify that, “11” which is an error code indicating an ignition failure in step 8 and a region code indicating an error region (afterburner 9) “ A5 "is alternately displayed on the display panel 29 at intervals of 1 second (FIG. 6).
Conversely, if V2> Vs in step 2, but V1 <Vs (S2: V1 <Vs), that is, if a misfire is detected earlier in the cooking thermocouple 27x. In order to determine that an ignition failure has occurred in the cooking burner 8 and to notify that, “11” indicating an ignition failure and “05” indicating an error part (cooking burner 8) are displayed on the display panel 31. Are displayed alternately at intervals of 1 second.
Therefore, even if one of the cooking burner 8 and the afterburner 9 is misfired, both of them are extinguished at the same time. Therefore, even in the grill as in this embodiment, it is difficult to know which burner is abnormal. , You can see at a glance which burner caused the ignition failure.

Next, it is monitored whether the thermoelectromotive force V of the thermocouples 27x and 27y is larger than the set voltage Vs from when the burners 8 and 9 are ignited until cooking is finished (S9), and V1 <Vs or In the case of V2 <Vs (S9: NO), it is considered that a misfire has occurred midway, and energization to the electromagnetic coil 24 is stopped (S10, S11), and “10” is displayed on the display panel 31 to indicate a midway misfire error. Display (S12, S13) and the operation ends.
Here, when V2 <Vs is first detected in step 9 (S9: V2 <Vs), in order to determine that a misfire has occurred in the middle of the afterburner 9, In step 13, “10” indicating a misfire failure and “A5” indicating an error part (afterburner 9) are alternately displayed on the display panel 31 at intervals of 1 second.
Conversely, if V1 <Vs is first detected in step 9 (S9: V1 <Vs), it is determined that a misfire has occurred on the cooking burner 8, and this is indicated. In step 12, “10” indicating an ignition failure and “A5” indicating an error part (cooking burner 8) are alternately displayed on the display panel 31 at intervals of 1 second.
Therefore, even if one of the cooking burner 8 and the afterburner 9 is misfired, both of them are extinguished at the same time. Therefore, even in the grill as in this embodiment, it is difficult to know which burner is abnormal. , You can see at a glance which burner caused the ignition failure.
When both V1 and V2 are larger than Vs (S9: YES), it is considered that combustion is continued, and it is determined whether or not the cooking end time has been reached (S14). When the cooking time has been reached (S14: YES), energization to the electromagnetic coil 24 is stopped and the magnet safety valve 22 is closed (S15).
Finally, the user presses the fire extinguishing button 10 again to close the main valve 23 and finish the operation.

The transition of the electromotive force V from the after thermocouple 27y with respect to the elapsed time T from the ignition of the afterburner 9 is as shown in the graph of FIG. A curved line L1 represented by a dotted line is a characteristic when the same thermocouple as the cooking thermocouple 27x is used, and a curved line L2 represented by a solid line is the after thermocouple 27y used in this embodiment (from the cooking thermocouple 27x). This is a characteristic with a large back electromotive force).
Since the after burner 9 is provided in the exhaust passage, the after-heat thermocouple 27y continues to be heated by the exhaust from the cooking burner 8 even if a misfire occurs in the middle, so the thermocouple 27y for the after-burner 9 is used for the cooking burner 8 When the same thermocouple as the thermocouple (cooking thermocouple 27x) is used, the electromotive force does not decrease to the misfire detection level Vs (for example, 2 mV) as shown in FIG. There's a problem.
On the other hand, in the present embodiment, the ratio of the counter electromotive force generated in the after thermocouple 27y is cooked by making the third conductor 34 of the after thermocouple 27y longer or thinner to increase the electric resistance value. Since it is set to be larger than the ratio of the counter electromotive force generated in the thermocouple 27x, as shown in FIG. 7, the sum of thermoelectromotive forces (synthetic electromotive force) is further quickly reduced, and the misfire detection level Vs is quickly detected. It can be:

As described above, according to the grill 5 of the present embodiment, the back burner 8 is provided in the exhaust passage of the cooking burner 8 by setting the back electromotive force of the after thermocouple 27y large, so that the after burner is unlikely to decrease in the event of a misfire. Also in the section, the thermoelectromotive force can be quickly reduced to the misfire detection level, and the supply of fuel gas can be quickly cut off.
Further, when the output voltage from either one or both of the cooking thermocouple 27x and the after thermocouple 27y falls below a predetermined electromotive force, that is, misfire is detected from either the cooking burner 8 or the afterburner 9. Then, the gas flow path to both the burners 8 and 9 is closed by one magnet safety valve 22, and the fire is extinguished simultaneously. Therefore, it is not necessary to separately provide two magnet safety valves for the cooking burner 8 and for the afterburner 9, and a single safety valve can be used, so that the manufacturing cost can be reduced.

Further, in the grill of the present embodiment, when the cooking thermocouple 27x first detects misfire, a misfire error (ignition failure or misfire) of the cooking burner 8 is displayed on the display panel 29, and conversely, the after thermocouple 27y is first. When misfire is detected, a misfire error (ignition failure or midway misfire) of the afterburner 9 is displayed on the display panel 29. For this reason, even in a grill where one magnet safety valve 22 shuts off the supply of gas fuel to both the burners 8 and 9 when one of the cooking burner 8 and the afterburner 9 fails, the fire is extinguished at the same time. , You can see at a glance which one failed.
As a result, when the service person makes repairs, it is not necessary to specify the malfunctioning burner, and the repair work can be completed in a short time.
In particular, since the afterburner 9 is provided at a position where the afterburner 9 cannot be seen from the outside of the instrument (inside the exhaust duct 16), it is effective to perform error display as distinguished in this embodiment.
As described above, in the present embodiment, as a safety measure in the event of a misfire failure, the fuel gas is shut off at the same time with one magnet safety valve 22 and the error display is distinguished according to the part, so that repair can be performed while suppressing the manufacturing cost. Can be performed appropriately.
In addition, since the burner in which the misfire abnormality has occurred is identified and displayed using the common indicator (grill display portion 11), the misfire abnormality indicator for the cooking burner 8 and the afterburner 9 purposely are used. It is not necessary to provide a separate misfire abnormality indicator, and an increase in manufacturing cost can be suppressed. Furthermore, since the indicator (grill display unit 11) for displaying the misfire abnormality is also used as the indicator of the grill timer, an increase in manufacturing cost can be further suppressed.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention.
For example, in this embodiment, inconel, constantan, and chromel are used as the materials of the first conductor 32, the second conductor 33, and the third conductor 34, respectively, but the present invention is not limited to these. Any combination of materials may be used as long as the thermoelectromotive force generated at the first connection point 35 and the second connection point 36 has a reverse polarity.
In this embodiment, the third conductor 34 of the thermocouple 27y for the after burner 9 is made longer than the cooking burner 8 with the same thickness, or the length is the same for the after burner 9. Although the resistance of the third conductor 34 for the afterburner 9 is increased by making the side thinner, the present invention is not limited to this. For example, the length of the after burner 9 may be longer and thinner, or the thickness of the after burner 9 may be thicker as long as the electrical resistance value becomes larger than that of the longer length. Even if the burner 9 is shortened, it does not matter as long as the electrical resistance value is increased by making it thinner at a higher rate.

Further, the combustion method and arrangement of the cooking burner 8 and the afterburner 9 can be arbitrarily changed, and the catalyst filter 20 is not necessarily provided.
In the present embodiment, the misfire of the burners 8 and 9 is detected and displayed in both cases of ignition failure in which ignition was not performed normally and misfire in which the flame disappears in the middle. , It may be performed only in either case.

  The present invention can be applied not only to gas appliances incorporating a grill such as a gas table stove or a gas built-in stove, but also to a cooker having a single grill such as a fish grill.

1 is a schematic configuration diagram of a built-in stove equipped with a gas grill as Example 1. FIG. 1 is a schematic side cross-sectional configuration diagram of a gas grill as Example 1. FIG. 1 is a system configuration diagram of a gas grill as Example 1. FIG. 1 is a cross-sectional view of a thermocouple as Example 1. FIG. 3 is a flowchart showing error display control as Example 1. It is explanatory drawing which shows the display form of an ignition failure error (after burner). It is a graph which shows the relationship between the elapsed time from the ignition start, and the electromotive force of an after thermocouple.

Explanation of symbols

5 Grill 8 Cooking Burner 9 After Burner 12 Grill Box 16 Exhaust Duct 22 Magnet Safety Valve 27x Cooking Thermocouple 27y After Thermocouple 28 Controller 32 First Conductor 33 Second Conductor 34 Third Conductor 35 First Connection Point 36 Second Connection point A Main electromotive part B Back electromotive part

Claims (1)

A cooking burner that heats the food in the grill;
An afterburner for purifying smoke provided in an exhaust passage for smoke generated from the food;
A cooking burner thermocouple whose thermoelectromotive force changes depending on the combustion state of the cooking burner;
An afterburner thermocouple whose thermoelectromotive force varies depending on the combustion state of the afterburner,
Cooking burner misfire detection means for detecting misfire of the cooking burner by electromotive force from the cooking burner thermocouple;
An afterburner misfire detecting means for detecting misfire of the afterburner by an electromotive force from the afterburner thermocouple,
The cooking burner thermocouple and the afterburner thermocouple each generate an electromotive force generated by combustion of the cooking burner or the afterburner, and an electromotive force in a direction opposite to the main electromotive portion. In the grill which is a counter electromotive force type thermocouple having a counter electromotive portion,
The ratio of the counter electromotive force generated in the counter electromotive force portion to the electromotive force generated in the main electromotive force portion in the afterburner thermocouple is defined as the counter electromotive force portion relative to the electromotive force generated in the main electromotive force portion in the cooking burner thermocouple. A grill characterized in that it is larger than the ratio of back electromotive force generated in the above.

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