JP2017077394A - grill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect whether a grill door is opened or not without using a dedicated sensor in a grill for performing safety control of stopping combustion of a burner when the grill door is opened during the combustion of the burner, the grill including a burner chamber that stores a lower burner including laterally-facing flame holes on the lower side of a grill chamber and introduces a secondary air from the outside of the chamber, where the lower burner includes a thermocouple for detecting flame.SOLUTION: The grill includes: first discrimination means (STEPs 5 and 21) that, when an absolute value ΔTC of an amount of descent per unit hour of an electromotive voltage of a thermocouple becomes a first threshold YV1 or more, determines that a grill door is opened; and second discrimination means (STEPs 7 and 23) that, when an amount-of-ascent ΔTC per unit time of the electromotive voltage of the thermocouple becomes a second threshold value YV2 or more, determines that the grill door is closed. When a prescribed time t3 elapses after the first discrimination means determines that the grill door is opened without any determination made by the second discrimination means that the grill door is closed, the grill stops the combustion of the burner.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a grill provided with a grill, a grill door that opens and closes a front opening of the grill, and a lower burner that is long in the front-rear direction and has a plurality of flame openings that open sideways.

  Conventionally, as this type of grill, the lower fire burner is housed in a burner chamber provided at the lower part of the grill cabinet, an air intake for introducing secondary air from outside the grill cabinet is provided in the burner chamber, and the side of the burner chamber is provided. What opened the flame blower outlet which blows out the flame formed in the flame mouth of a lower-fired burner in the grill in the side part is known (for example, refer patent document 1). Moreover, in this thing, the thermocouple for the flame detection which faces some flame outlets of a lower-fired burner is provided.

  By the way, if the grill door is left open while the burner provided in the grill store including the lower fire burner is burned, the hot air in the grill store may leak out from the front opening to the outside. Therefore, conventionally, a temperature sensor that detects the temperature of the outer upper part of the grill door is provided, and when the grill door is open and hot air leaks and the temperature sensor detects that the temperature rises, the grill door is determined to be open. And what stops the combustion of a burner is also known (for example, refer patent document 2).

  However, providing the dedicated sensor for detecting the opening of the grill door in this way increases the cost.

JP 2012-254245 A JP 2012-157437 A

  In view of the above, an object of the present invention is to provide a grill that can detect whether a grill door is opened without using a dedicated sensor.

  In order to solve the above-mentioned problems, a first invention of the present application includes a grill cabinet, a grill door that opens and closes a front opening of the grill cabinet, and a lower fire burner that is long in the front-rear direction and has a plurality of flame openings that open sideways. The lower fire burner is housed in a burner chamber provided at the lower part of the grill cabinet, an air intake for introducing secondary air from outside the grill cabinet is provided in the burner chamber, and on the side of the burner chamber, A grill that has a flame outlet that blows out the flame formed in the flame outlet of the lower flame burner into the grill cabinet, and is further equipped with a thermocouple for detecting the flame that faces some flame outlets of the lower flame burner In the second embodiment, during the combustion of the lower fire burner, a determination process is performed to determine that the grill door is opened when the absolute value of the amount of decrease in the electromotive voltage of the thermocouple per unit time exceeds a predetermined first threshold value. 1 discriminating means and 1st discriminating means opened the grill door And a second discriminating unit for performing a discriminating process for determining that the grill door is closed when the increase amount per unit time of the electromotive voltage of the thermocouple is equal to or greater than a predetermined second threshold after the determination. Combustion of the burner provided in the grille including the lower-burn burner is stopped when a predetermined time has passed without the grilling door being closed by the second discriminating unit after the discriminating unit judges that the grille door has been opened. It is characterized by doing.

  Moreover, 2nd invention of this application is equipped with a grill warehouse, the grill door which opens and closes the front opening of a grill warehouse, and the lower flame burner long in the front-back direction which has several flame openings opened horizontally, A lower fire burner Is housed in a burner chamber provided in the lower part of the grill cabinet, an air intake for introducing secondary air from the outside of the grill cabinet is provided in the burner chamber, and a flame outlet of the lower fire burner is provided on the side of the burner chamber. In the grill provided with a thermocouple for detecting a flame facing a part of the lower flame burner, a flame outlet for blowing out the flame formed in the grill chamber was opened. Counts the number of times that the absolute value of the change amount per unit time of the electromotive voltage of the thermocouple becomes equal to or greater than a predetermined threshold value (hereinafter referred to as the third threshold value to distinguish it from the first and second threshold values) during combustion. When this number reaches the specified number, the grill door is opened. It is determined that the grill door is opened by the third determination means, and includes a determination means for performing a determination process for determining that it is present (hereinafter referred to as a third determination means to distinguish from the first and second determination means). The combustion of the burner provided in the grill warehouse including the lower fire burner is stopped.

  Here, in a state where the grill door is closed, the inside of the grill has a slightly negative pressure due to the draft effect due to the discharge of the combustion exhaust gas from the exhaust passage communicating with the rear end of the grill, and is sucked from the air intake port. Air (secondary air) flows laterally from the flame outlet through the burner chamber into the grill, and the flame generated at the flame outlet of the lower flame burner extends in the lateral direction. And a thermocouple is arrange | positioned so that the external flame of the flame extended in a horizontal direction may be touched. On the other hand, if the grill door is opened widely to check the condition of the food to be cooked, a large amount of air suddenly flows from the front into the grill cabinet, increasing the pressure in the cabinet and sucking air from the air intake. Is inhibited. Therefore, the flame generated at the flame outlet of the lower flame burner does not spread in the horizontal direction, the inner flame of the flame touches the thermocouple, the electromotive voltage of the thermocouple greatly decreases, and the amount of decrease in electromotive voltage per unit time The absolute value of becomes greater than or equal to the first threshold. After that, when the grill door is closed, the suction of air from the air intake is resumed, the flame spreads again in the horizontal direction, the flame outside the flame touches the thermocouple, the electromotive voltage of the thermocouple increases greatly, The amount of increase in voltage per unit time is greater than or equal to the second threshold value.

  Therefore, according to the first aspect of the present invention, when the grill door is largely opened, this can be detected by the above-described determination processing by the first determination means, and when the grill door is closed thereafter, this is determined by the second determination means. Can be detected by processing. If the grill door is left open for a predetermined time or more, the burner combustion is stopped, which is safe.

  Also, if the grill door is left in a slightly open half-open state, the flame generated at the flame outlet of the lower flame burner will shake, and the absolute value of the change amount per unit time of the electromotive force of the thermocouple will be over the third threshold value. This happens repeatedly. Therefore, according to the second aspect of the invention, when the grill door is left in a half-open state, this can be detected by the above-described discrimination process by the third discrimination means, and combustion of the burner can be stopped safely.

  In both the first invention and the second invention, since the opening of the grill door can be detected using a thermocouple for detecting the flame of the lower flame burner, a dedicated sensor for detecting the opening becomes unnecessary, and the cost is reduced. You can go down.

  Note that the electromotive force of the thermocouple changes even after the grill door is closed for a while after the lower fire burner is ignited or for a while after the heating power of the lower fire burner is changed. Therefore, in order to prevent misjudgment, in the first invention, until the predetermined waiting time elapses after the lower fire burner is ignited, or after the heating power of the lower fire burner is changed, the predetermined second waiting time. It is desirable not to perform the discrimination process by the first discrimination means until the time has elapsed. Similarly, in the second invention, until the predetermined waiting time elapses after the lower fire burner is ignited, or until the predetermined second waiting time elapses after changing the heating power of the lower fire burner, It is desirable not to perform the discrimination process by the third discrimination means.

  By the way, the grill door may be opened from the beginning of ignition of the lower fire burner and left as it is. In order to deal with such a situation, the third invention of the present application is a longitudinally extending lower burner having a grill cabinet, a grill door that opens and closes the front opening of the grill cabinet, and a plurality of flame openings that open sideways. The lower fire burner is housed in a burner chamber provided at the lower part of the grill cabinet, and an air intake for introducing secondary air from outside the grill cabinet is provided in the burner chamber, on the side of the burner chamber. In addition, a flame outlet that blows out the flame formed in the flame outlet of the lower flame burner to the inside of the grill chamber is opened, and further, a thermocouple for detecting the flame facing a part of the flame outlet of the lower flame burner, and the grill chamber In a grill provided with a temperature sensor for detecting the temperature inside, when a predetermined time has elapsed since the lower burner was ignited, the electromotive voltage of the thermocouple is less than the predetermined reference voltage and the lower fire burner Temperature detected by the temperature sensor from the ignition point Discriminating means for performing a discriminating process for determining that the grill door is open when the amount of increase is less than a predetermined reference value (hereinafter referred to as a fourth discriminating means for distinguishing from the first to third discriminating means). And the combustion of the burner provided in the grill warehouse including the lower fire burner is stopped when it is determined by the fourth determining means that the grill door is open.

  Here, if the grill door has been opened from the beginning of the ignition of the lower fire burner, the electromotive voltage of the thermocouple becomes less than the reference voltage when a predetermined time has elapsed since the lower fire burner was ignited, and The temperature increase amount of the temperature detected by the temperature sensor from the time of ignition of the lower fire burner is less than a predetermined reference value. Therefore, according to the third aspect of the invention, when the grill door is opened from the beginning of ignition of the lower flame burner, this is detected by the discrimination process by the fourth discrimination means, and combustion of the burner can be stopped and it is safe. In addition, the temperature sensor that detects the temperature in the grill cabinet is a sensor that has been conventionally provided to perform automatic cooking by controlling the heating power of the burner and the fire extinguishing timing of the burner according to the detected temperature, Also in the third aspect of the invention, a dedicated sensor for detecting the opening of the grill door becomes unnecessary, and the cost can be reduced.

  In the following embodiments, STEPs 5 and 21 correspond to the first determination means, STEPs 7 and 23 correspond to the second determination means, and the third determination means corresponds to the third determination means. STEP18 to STEP20, and STEP12 and 13 correspond to the fourth discriminating means.

The cut side view of the grill of the embodiment of the present invention. The cut front view cut | disconnected by the II-II line | wire of FIG. The perspective view of the lower fire burner provided in the grill of an embodiment. (A) The graph which shows the change of the electromotive voltage TC of the thermocouple after ignition, and the detection temperature TH of a temperature sensor, (b) The graph which shows the change of variation | change_quantity (DELTA) TC per unit time of the electromotive voltage of a thermocouple. The graph which shows the change of variation | change_quantity (DELTA) TC per unit time of the electromotive force of a thermocouple when a grille door is made into a half open state. The graph which shows the change of the electromotive voltage TC of a thermocouple when the grill door is opened from the beginning of ignition, and the detection temperature TH of a temperature sensor. The flowchart which shows the content of the safety control which detects the opening of the grill door performed in the grill of embodiment.

  Referring to FIGS. 1 and 2, A shows a grill according to an embodiment of the present invention incorporated in a gas stove (not shown). The grill A includes a grill cabinet 1 installed in a stove body (not shown), and a grill door 2 that opens and closes the front opening of the grill cabinet 1. A grill pan 1 and a grill net 4 above it are stored in the grill cabinet 1. A slide frame 21 extending rearward is connected to the grill door 2, and the grill pan 3 is supported by the slide frame 21. A support frame 22 that supports the grill 4 is erected before and after the slide frame 21. And the grill pan 3 and the grill 4 are pulled out to the front of the grill warehouse 1 by opening the grill door 2 forward.

  An upper fire burner 5 is provided on the ceiling of the grill cabinet 1, and a heat shield cover 11 is further provided so as to cover the upper fire burner 5 from above. The upper fire burner 5 is composed of a surface combustion burner having a ceramic combustion plate 51 in which a large number of flame holes (not shown) are formed, and is placed above the ceiling of the grill cabinet 1 with the combustion plate 51 facing downward. A fire burner 5 is installed. Note that the air-fuel mixture is supplied to the upper fire burner 5 from a mixing pipe 52 provided at the rear part thereof.

  A lower fire burner that is long in the front-rear direction and has a plurality of flame openings 61 that are open laterally, specifically, inwardly in the horizontal direction, at the lower part of the side portion of the grill 1 (lower part than the grill 4). 6 is arranged. In addition, as shown in FIG. 3, the lower fire burner 6 arrange | positioned at the horizontal side part lower part of the one side of the grill warehouse 1, and the lower fire burner 6 arrange | positioned at the horizontal side part lower part of the other side of the grill warehouse 1 are rear end. The air-fuel mixture is supplied to the lower fire burners 6 and 6 from a mixing pipe 63 communicating with the connecting pipe part 62. Further, a bracket 64 is fixed to the rear upper side of each lower fire burner 6, the thermocouple 7 for detecting the flame facing a part of the flame openings 61, and the target part 81 integrated with the bracket 64 are opposed to the bracket 64. An ignition electrode 8 is attached.

  On the inner surface of each side wall 12 on both sides in the horizontal direction of the grill cabinet 1, an upper plate 13 projecting inward in the lateral direction above the lower fire burner 6, and inward in the lateral direction at a lower position of the lower fire burner 6. A lower plate 14 is provided, and a burner chamber 15 for storing the lower fire burner 6 is defined between the upper plate 13 and the lower plate 14. In each side wall 12, a first air intake port 15 a on the upper side of the lower fire burner 6 and a first air intake port on the lower side of the lower fire burner 6 for introducing secondary air into the burner chamber 15 from outside the grill 1. A second air intake hole 15b smaller than 15a is opened. Further, a flame outlet 15 c for blowing a flame formed in the flame outlet 61 of the lower flame burner 6 into the grill chamber 1 is opened at the lateral side portion inward in the horizontal direction of the burner chamber 15.

  In addition, the grill A includes an exhaust passage 16 that extends rearward and upward from the upper rear end of the grill cabinet 1. In the state where the grill door 2 is closed, the inside of the grill cabinet 1 is slightly negative pressure due to the draft effect due to the discharge of the combustion exhaust gas from the exhaust passage 16, and the air (secondary air) sucked from the air intakes 15a and 15b. ) Flows through the burner chamber 15 from the flame outlet 15c in the horizontal direction into the grill cabinet 1, and the flame generated in the flame port 61 of the lower flame burner 6 extends in the horizontal direction along the flow of the secondary air. And the thermocouple 7 is arrange | positioned so that the external flame of the flame extended in a horizontal direction may be touched.

  Further, the grill A includes a temperature sensor 9 disposed on the bottom surface of the exhaust passage 16 in order to detect the temperature in the grill cabinet 1. A cover 9a is provided to cover the temperature sensor 9 from above in order to prevent foreign matter such as spillage from entering the exhaust passage 16 from above.

  By the way, if the grill door 2 is greatly opened during the combustion of the lower fire burner 6 in order to confirm the condition of the cooked food on the grill 4, a large amount of air suddenly flows into the grill compartment 1 from the front. Thus, the internal pressure increases and the suction of air from the air intake ports 15a and 15b is hindered. Therefore, the flame generated at the flame outlet 61 of the lower flame burner 6 rises without extending in the lateral direction, the inner flame of the flame touches the thermocouple 7, and the electromotive voltage TC of the thermocouple 7 is as shown in FIG. The absolute value of the drop amount −ΔTC per unit time (for example, 4 seconds) of the electromotive voltage becomes not less than a predetermined first threshold YV1 (for example, 2.0 mV) as shown in FIG. 4B. After that, when the grill door 2 is closed, the suction of air from the air intakes 15a and 15b is resumed, the flame spreads again in the horizontal direction, the flame outside the flame touches the thermocouple 7, and the electromotive voltage of the thermocouple 7 TC greatly increases as shown in FIG. 4A, and the amount of increase + ΔTC per unit time (for example, 4 seconds) of the electromotive voltage TC becomes equal to or greater than a predetermined second threshold YV2 (for example, 2.0 mV). FIG. 4A also shows changes in the detected temperature TH of the temperature sensor 9 after the upper fire burner 5 and the lower fire burner 6 are ignited.

  Further, if the grill door 2 is left in a partially opened half-open state during combustion of the lower fire burner 6, the flame generated at the flame outlet 61 of the lower fire burner 6 is shaken, and the electromotive force of the thermocouple 7 is unit time. A situation in which the absolute value of the change amount ± ΔTC per (for example, 4 seconds) becomes a predetermined third threshold YV3 (for example, 0.5 mV) or more as shown in FIG. 5 repeatedly occurs.

  Furthermore, if the grill door 2 has been opened from the beginning of the ignition of the lower fire burner 6, a predetermined t1 time (corresponding to the waiting time of claim 5 and the predetermined time of claim 7) after the lower fire burner 6 is ignited. When, for example, 3 minutes have elapsed, as shown in FIG. 6, the electromotive voltage TC of the thermocouple 7 becomes less than a predetermined reference voltage YV (for example, 10 mV), and the lower burner 6 is ignited. The temperature increase amount ΔTH of the detected temperature TH of the temperature sensor 9 from the time point becomes less than a predetermined reference value YTH (for example, 50 ° C.).

  Therefore, in this embodiment, when the grill door 2 is opened, it is detected by using the above-described phenomenon by the grill control means comprising a microcomputer (not shown), and safety control is performed to extinguish the burners 5 and 6. I did it. Hereinafter, this safety control will be described in detail with reference to FIG.

  In the safety control, first, it is determined whether or not the upper fire burner 5 and the lower fire burner 6 are ignited in STEP1, and when ignited, it proceeds to STEP2 and it is determined whether or not the heating power is changed. If the heating power is not changed, the process proceeds to STEP 3 to determine whether or not the time t1 has elapsed since the burners 5 and 6 were ignited. If not, the process proceeds to STEP 4 and the burners 5 and 6 are fired. It is determined whether or not a predetermined t2 time (corresponding to the waiting time of claim 2, for example, 1 minute) has elapsed since ignition, and the process returns to STEP 2 before the ignition.

  When t2 hours have elapsed since the burners 5 and 6 were ignited, the process proceeds to STEP5, and whether or not the absolute value ΔTC of the amount of drop −ΔTC per unit time of the electromotive voltage TC of the thermocouple 7 has become equal to or greater than the first threshold YV1. To determine. If ΔTC <YV1, the process returns to STEP2. However, if ΔTC ≧ YV1, it is determined that the grill door 2 has been opened, and the process proceeds to STEP6. After ΔTC ≧ YV1, a predetermined t3 time (see claim 1). It is equivalent to a predetermined time, for example, it is determined whether or not 2 minutes have elapsed. The process proceeds to STEP 7 until the time t3 elapses, and it is determined whether or not the amount of increase ΔTC per unit time of the electromotive voltage TC of the thermocouple 7 has become equal to or greater than the second threshold YV2, that is, whether or not the grill door 2 is closed. . If t3 time has passed without ΔTC ≧ YV2, that is, it is not determined that the grill door 2 is closed, the process proceeds to STEP 8, and the burner provided in the grill 1 including the lower fire burner 6, that is, An error stop is performed to stop the combustion of the upper fire burner 5 and the lower fire burner 6.

  If ΔTC ≧ YV2 before the time elapsed since ΔTC ≧ YV1 reaches t3 hours, whether or not a predetermined t4 time (for example, 15 seconds) has elapsed since ΔTC ≧ YV2 in STEP 9 The process proceeds to STEP 15 to be described later.

  If it is determined in STEP 2 that the heating power has been changed, the process proceeds to STEP 10, and after changing the heating power, it corresponds to a predetermined t5 time (corresponding to the second waiting time in claims 3 and 6, for example, 15 seconds). ) It is determined whether or not it has elapsed, and before proceeding, the process proceeds to STEP 11 to determine whether or not t1 time has elapsed since the burners 5 and 6 were ignited. Then, if the elapsed time from the change of thermal power reaches t5 hours before the elapsed time from the ignition reaches t1 time, the process returns to STEP2, and the elapsed time from ignition before the elapsed time from the change of thermal power reaches t5 hours. When t1 has reached t1, the process proceeds to STEP 12 described later. Further, if the elapsed time from ignition reaches t1 time without changing the heating power after ignition, the process proceeds from STEP3 to STEP12.

  According to the above control, when the grill door 2 is largely opened, this can be detected by the discrimination process in STEP 5, and when the grill door 2 is closed thereafter, this can be detected by the discrimination process in STEP 7. If the grill door 2 remains open for t3 hours or more, the combustion of the burners 5 and 6 is stopped, which is safe. Furthermore, since the opening of the grill door 2 can be detected using the thermocouple 7 for detecting the flame of the lower fire burner 6, a dedicated sensor for detecting the opening becomes unnecessary, and the cost can be reduced.

  Further, for a while after ignition or for a while after changing the heating power of the lower fire burner 6, even if the grill door 2 is closed, the electromotive voltage of the thermocouple 7 changes, which may cause erroneous determination. However, in the above control, the determination process in STEP 5 is not performed until t2 time elapses after ignition and until t5 time elapses after the heating power is changed, so that erroneous determination can be effectively prevented.

  When t1 time has elapsed after ignition, the process proceeds to STEP 12 as described above, and it is determined whether or not the temperature increase ΔTH from the ignition point of the temperature TH detected by the temperature sensor 9 is less than the reference value YTH, and ΔTH <YTH. If there is, the process proceeds to STEP 13 to determine whether or not the electromotive voltage TC of the thermocouple 7 at that time is less than the reference voltage YV. If ΔTH <YTH and TC <YV, it is determined that the grill door 2 has been opened from the beginning of ignition, and the routine proceeds to STEP 14 where error stop is performed to stop the combustion of the burners 5 and 6.

  Thus, even when the grill door 2 is opened from the beginning of ignition, this is detected by the discrimination processing in STEPs 12 and 13 using the thermocouple 7 for flame detection and the temperature sensor 9 for automatic cooking. Thus, the combustion of the burners 5 and 6 can be stopped, which is safe. Further, since a sensor dedicated to detecting the opening of the grill door 2 is not necessary, the cost can be reduced.

  If it is determined in STEP 12 that ΔTH ≧ YTH or STEP 13 is determined as TC ≧ YV, the process proceeds to STEP 15 where the determination number N is set to a predetermined number, for example, “6”. Next, the process proceeds to STEP 16 to determine whether or not the heating power has been changed. If the heating power has been changed, it is determined whether or not t5 hours have elapsed since the heating power was changed in STEP 17 and the process returns to STEP 16. Then, when the thermal power is not changed or when t5 time has elapsed since the thermal power is changed, the process proceeds to STEP 18, where the absolute value ΔTC of the change amount ± ΔTC per unit time of the electromotive voltage TC of the thermocouple 7 is the third threshold value YV3. It is determined whether or not the above has been reached. If ΔTC ≧ YV3 when the grill door 2 is in the half-open state, the number of determinations N is updated to “1” subtracted in STEP 19 and then it is determined in STEP 20 whether or not the determination number N has become “0”. If N = 0 or ΔTC <YV3, the process proceeds to STEP 21 and whether or not the absolute value ΔTC of the amount of drop −ΔTC per unit time of the electromotive voltage TC of the thermocouple 7 is equal to or greater than the first threshold YV1. If ΔTC <YV1, the process returns to STEP16.

  If the number of times ΔTC ≧ YV3 is determined to be “6” in STEP18 without being determined as ΔTC ≧ YV1 in STEP21, N = 0 is determined in STEP20. In this case, it is determined that the grill door 2 is opened, and the process proceeds to STEP 14 where error stop is performed to stop the combustion of the burners 5 and 6.

  Thus, when the grill door 2 is left in a half-open state, this can be detected by the discrimination processing in STEPs 18 to 20 using the thermocouple 7 for detecting the flame, and the combustion of the burners 5 and 6 can be stopped safely. Further, since a sensor dedicated to detecting the opening of the grill door 2 is not required, the cost can be reduced.

  Further, for a while after ignition or for a while after changing the heating power of the lower fire burner 6, even if the grill door 2 is closed, the electromotive voltage of the thermocouple 7 changes, which may cause erroneous determination. However, in the above control, since the discrimination process in STEP 18 to 20 is not performed until t1 time has elapsed since ignition and until t5 time has elapsed since the heating power was changed, erroneous discrimination is effectively prevented. it can.

  If it is determined in STEP 21 that ΔTC ≧ YV1, the same processing as in STEPs 6 to 9 described above is performed. That is, first, it is determined whether or not t3 time has elapsed since ΔTC ≧ YV1 in STEP22, and the process proceeds to STEP23 until it elapses, where the amount of increase ΔTC per unit time of the electromotive voltage TC of the thermocouple 7 is the second. It is determined whether or not the threshold value YV2 has been reached. Then, when t3 time has passed without ΔTC ≧ YV2, the routine proceeds to STEP 14 where error stop is performed to stop the combustion of the burners 5 and 6. On the other hand, if ΔTC ≧ YV2 before the elapsed time after reaching ΔTC ≧ YV1 reaches t3 hours, it is determined in STEP 24 whether t4 hours have elapsed since ΔTC ≧ YV2. By the way, it returns to STEP16.

  Therefore, the determination process in STEP 18 is not performed until it is determined in STEP 21 that ΔTC ≧ YV1 until it is determined in STEP 23 that ΔTC ≧ YV2, and until t4 time has elapsed since it was determined in STEP 23 that ΔTC ≧ YV2. . Here, immediately after the grill door 2 is closed, the electromotive voltage TC of the thermocouple 7 fluctuates. However, since the discrimination process in STEP 18 is not performed until t4 hours have passed since the grill door 2 is closed, an erroneous discrimination is made. Can be prevented.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above embodiment, the discrimination process based on the electromotive voltage of the thermocouple 7 attached to one of the two lower fire burners 6 and 6 arranged in the grill warehouse 1 is performed. It is also possible to perform the above-described determination processing in consideration of the electromotive voltage of the thermocouple 7 attached to the other lower burner 6. In this case, the absolute value of the drop amount per unit time of the electromotive voltage of the thermocouple 7 attached to at least one of the lower burner 6 in STEPs 5 and 21 is equal to or greater than the first threshold set for this thermocouple. It is determined that the grill door 2 is sometimes opened, and the amount of increase per unit time of the electromotive force of the thermocouple 7 attached to at least one of the lower burner 6 in STEP 7 and 23 is set for this thermocouple. It is determined that the grill door 2 is closed when the threshold value is exceeded, and in STEP 13, the electromotive voltage of the thermocouple 7 attached to one of the lower burner 6 is less than the reference voltage set for this thermocouple and the other When it is determined that the electromotive voltage of the thermocouple 7 attached to the lower fire burner 6 is less than the reference voltage set for this thermocouple, the routine proceeds to STEP 14 to stop the error. Bayoi.

  Moreover, in the said embodiment, although the lower fire burner 6 is accommodated in the burner chamber 15 provided in the lower side part of the grill warehouse 1, a burner chamber is provided in the lower center part of a grill warehouse, The pair of left and right lower fire burners may be housed such that the left lower flame burner has a flame outlet facing left and the right lower flame burner has a flame outlet facing right. In this case, flame outlets are opened on the lateral sides of the left and right sides of the burner chamber, and an air intake is opened on the bottom wall of the grill cabinet. Moreover, although the said embodiment applies this invention to the grill built in a gas stove, this invention is applicable similarly to the grill provided independently, without incorporating in a gas stove.

  A ... grill, 1 ... grill storage, 15 ... burner chamber, 15a, 15b ... air intake, 15c ... flame outlet, 2 ... grill door, 6 ... lower fire burner, 7 ... thermocouple, 9 ... temperature sensor.

Claims (7)

A grill cabinet, a grill door that opens and closes the front opening of the grill cabinet, and a longitudinal lower flame burner having a plurality of flame openings that open sideways, the lower fire burner being provided at the lower portion of the grill cabinet Is installed in the burner chamber, and the burner chamber is provided with an air intake port for introducing secondary air from outside the grill chamber, and the flame formed at the flame outlet of the lower fire burner is placed in the grill chamber on the side of the burner chamber. In the grill provided with a thermocouple for detecting a flame facing a part of the bottom of the lower burner,
During the combustion of the lower flame burner, a first determination is performed for determining that the grill door has been opened when the absolute value of the amount of decrease in the electromotive force of the thermocouple per unit time exceeds a predetermined first threshold value. When the amount of increase per unit time of the electromotive voltage of the thermocouple is equal to or greater than a predetermined second threshold after it is determined that the grill door has been opened by the means and the first determining means, it is determined that the grill door has been closed. Second discriminating means for performing discriminating processing, and when the first discriminating means determines that the grill door has been opened and the second discriminating means does not determine that the grill door has been closed, a lowering time has elapsed. A grill characterized by stopping combustion of a burner provided in a grill cabinet including the burner.   2. The grill according to claim 1, wherein the determination process by the first determination unit is not performed until a predetermined waiting time elapses after the lower burner is ignited.   The grill according to claim 1 or 2, wherein the discrimination processing by the first discrimination means is not performed until a predetermined second waiting time elapses after the heating power of the lower fire burner is changed. A grill cabinet, a grill door that opens and closes the front opening of the grill cabinet, and a longitudinal lower flame burner having a plurality of flame openings that open sideways, the lower fire burner being provided at the lower portion of the grill cabinet Is installed in the burner chamber, and the burner chamber is provided with an air intake port for introducing secondary air from outside the grill chamber, and the flame formed at the flame outlet of the lower fire burner is placed in the grill chamber on the side of the burner chamber. In the grill provided with a thermocouple for detecting a flame facing a part of the bottom of the lower burner,
During the combustion of the lower flame burner, the number of times the absolute value of the change in the thermocouple electromotive voltage per unit time exceeds a predetermined threshold is counted, and when this number reaches the predetermined number, the grill door is opened. And a discriminating means for performing discriminating processing for judging that the grill door is open, and stopping the combustion of the burner provided in the grill warehouse including the lower fire burner when the discriminating means judges that the grill door is opened. Features a grill.   The grill according to claim 4, wherein the determination process by the determination unit is not performed until a predetermined waiting time elapses after the lower burner is ignited.   6. The grill according to claim 4, wherein the discriminating process by the discriminating means is not performed until a predetermined second waiting time elapses after the heating power of the lower fire burner is changed. A grill cabinet, a grill door that opens and closes the front opening of the grill cabinet, and a longitudinal lower flame burner having a plurality of flame openings that open sideways, the lower fire burner being provided at the lower portion of the grill cabinet Is installed in the burner chamber, and the burner chamber is provided with an air intake port for introducing secondary air from outside the grill chamber, and the flame formed at the flame outlet of the lower fire burner is placed in the grill chamber on the side of the burner chamber. In the grill provided with a flame outlet to be blown out, and further provided with a thermocouple for detecting a flame facing a part of the flame outlet of the lower burner, and a temperature sensor for detecting the temperature in the grill cabinet,
When a predetermined time elapses after ignition of the lower flame burner, the electromotive voltage of the thermocouple is less than the predetermined reference voltage, and the temperature rise amount of the temperature sensor detected from the ignition timing of the lower flame burner is predetermined. A discriminating means for performing a discriminating process for judging that the grill door is opened when it is less than a reference value of the grill, and including a lower burner when the discriminating means judges that the grill door is opened. A grill characterized in that the combustion of a burner provided in is stopped.

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