JP6162750B2 - Combustion device - Google Patents

Description

  The present invention relates to a combustion apparatus having a pilot burner for ignition in a combustion chamber and a main burner ignited by the ignition of the pilot burner, and using a dry battery as a power source.

  FIG. 5 shows a schematic system diagram of the combustion apparatus under development by the present inventors. This system configuration is also applied to embodiments described later. This combustion apparatus is an apparatus that is disposed in a bathroom, for example, and is called a balance-type bath. This apparatus has a pilot burner 38 for the ignition, a hot water supply main burner 10, and a bath main burner 39 for replenishing the bath, and an igniter electrode 43 for igniting the fuel gas supplied to the pilot burner 38. Is provided. The igniter electrode 43 and the burners 38, 10, 39 are provided in a combustion chamber 60 covered with a metal case. The combustion chamber 60 includes an air inlet (not shown), Combustion gas exhaust ports 17 of the burners 38, 10, and 39 are provided.

  The hot water supply main burner 10 is provided with a capacity switching knob 49, and the combustion capacity (fuel gas supply amount) of the hot water supply main burner 10 is set by manual operation of the capacity switching knob 49 when the combustion apparatus is installed. However, after that, combustion is performed with the set capacity (it is not varied every time the hot water supply main burner 10 is combusted).

  A bath reheating heat exchanger 40 heated by the bath main burner 39 is provided on the upper side of the bath main burner 39, and hot water supply heat exchange heated by the hot water supply main burner 10 is provided on the upper side of the hot water supply main burner 10. A vessel 7 is provided. A hot water supply high limit switch 47 is provided on the outlet side of the hot water supply heat exchanger 7, and a bath high limit switch 46 is provided in the bath reheating heat exchanger 40. Reference numeral 45 represents an overheat prevention device.

  Connected to the hot water supply heat exchanger 7 are a water supply introduction passage 19 for introducing water into the hot water supply heat exchanger 7 and a hot water supply passage 11 for guiding water heated through the hot water supply heat exchanger 7 to a hot water supply destination. Yes. A hot-water tap 9 is provided at the distal end side of the hot-water supply passage 11, and in this example, the hot-water tap 9 is formed of a switching lever type plug. This type of hot water tap 9 selectively switches hot water that has passed through the hot water supply passage 11 from either the hot water discharge pipe 30 side of the currant side or the shower side passage 31 by switching the lever. A state where the hot water is selected from the side of the hot water discharge pipe 30 is shown. Reference numeral 57 denotes a check valve, and 58 denotes a hot water shutoff valve.

  A water amount adjusting mechanism 21 is connected to the water supply introduction passage 19, and the water amount adjusting mechanism 21 is provided with a water governor 15, a diaphragm case (diaphragm chamber) 13, and a water amount adjusting chamber 20. The diaphragm case 13 is provided with a diaphragm 14, and the diaphragm 14 divides the inside of the diaphragm case 13 into a primary chamber 13a and a secondary chamber 13b. The water amount adjustment chamber 20 is provided with a temperature regulator 23, and the temperature regulator 23 is connected to the temperature adjustment knob 22.

  In addition, a water supply passage 8 that supplies water to the water amount adjustment mechanism 21, a passage 16 that draws water from the water amount adjustment mechanism 21, and a drainage passage 24 are connected to the water amount adjustment mechanism 21. A filter 25 is interposed in the water supply passage 8, and a drain plug 26 is provided in the drainage passage 24.

  A gas passage 32 as a gas supply means is connected to the hot water supply main burner 10, and the gas passage 32 is connected to a gas introduction passage 35 through a water pressure automatic gas valve 33 and an appliance plug 34. Yes. Reference numeral 51 denotes a water self-valve switch. A gas electromagnetic valve 54 is provided on the lower side of the instrument plug 34, and the water pressure automatic gas valve 33 is connected to the diaphragm 14.

  The gas introduction passage 35 is for introducing fuel gas from the outside into the combustion apparatus, and the fuel gas introduced from the gas introduction passage 35 is supplied to the hot water supply main burner 10 through the gas passage 32 via the appliance plug 34. Is done. Further, gas passages 36 and 37 as gas supply means are connected to the instrument plug 34, and the fuel gas introduced from the gas introduction path 35 to the instrument plug 34 is introduced into the pilot burner 38 through the gas path 36. , The gas is supplied to the bath main burner 39 through the gas passage 37.

  Although not shown in the figure, in the vicinity of the flame outlet of the pilot burner 38, a thermocouple for detecting the heat of the flame emitted from the flame mouth by an electromotive force by the heat and the flame of the pilot burner 38 are detected. A frame rod electrode is provided. The thermocouple is electrically connected to the electromagnetic valve 54.

  The instrument plug 34 is formed to include an instrument plug knob (operation knob) 48, a shaft 50, and a closing member 53 that is a manual opening / closing passage. As indicated by the arrows in FIG. 5, it is manually operated by moving up and down or rotating. As shown in FIG. 4A, the instrument plug knob 48 is formed to be rotatable, and in this example, the side marked with the knob is “stop”, “fire”, “hot water supply / shower”, By appropriately adjusting to any position of “chase”, the corresponding burner among the pilot burner 38, the hot water supply main burner 10, and the bath main burner 39 is ignited and ignited.

  Hereinafter, ignition and ignition operations of these burners will be briefly described with reference to FIGS. As shown in FIG. 5, the shaft 50 is provided with an instrument plug switch 52 (52a, 52b, 52c), and these switches are formed by microswitches. In step S1 of FIG. 7, when the instrument plug knob 48 is pushed down in the “stop” position, the shaft 50 is lowered together with the instrument plug knob 48, and the instrument plug switch 52a is turned on (52a on, 52b off, 52c off). (See also Table 1).

  Then, due to the pressing force at this time, the electromagnetic valve 54 opens (see step S2 in FIG. 7), and the fuel gas flows through the gas introduction passage 35 to the inlet of the instrument plug 34. In this state, in step S3 of FIG. 7, the instrument plug knob 48 is turned to the “flame” position, and along with the rotation, as shown in FIG. When the angle between the position and the knob mark is, for example, 33 °, the fuel gas passes through the igniting passage formed in the closure 53 of the appliance plug 34 (the igniting passage opens), as shown in step S4 of FIG. , The gas passage 36 (for ignition) is opened, and the fuel gas is introduced into the gas passage 36 (that is, while the instrument plug 34 is moved from the fire extinguishing position to the ignition position, the pilot is removed from the gas passage 36). The supply of fuel gas to the burner 38 is started), and through the pilot nozzle provided at the tip of the gas passage 36, the primary air is sucked from the primary air hole of the pilot burner 38 toward the flame mouth side (pilot burner head). Flowing.

  In addition, when the fuel gas is supplied, the instrument plug switch 52c is turned on (52a on, 52b off, 52c on), and the control of the combustion control unit (not shown) using a dry battery (not shown) as a power source controls the operation shown in FIG. In step S6, an igniter (ignition transformer) (not shown) is energized, and the pilot burner 38 is ignited by the spark of the igniter electrode 43. That is, when the ignition operation for moving the appliance plug knob 48 from the “stop” position to the “flame” position and moving the appliance plug 34 from the extinguishing position to the ignition position is performed, Ignition operation is performed.

  In the combustion apparatus shown in FIG. 5, when the instrument plug knob 48 is turned to the “flame” position to release the instrument plug knob 48 (excluding the pushing down force), the shaft 50 returns to the original position, and the instrument plug switch 52a. Is turned off (52a off, 52b off, 52c on) (see Table 1). Immediately after the instrument plug knob 48 is turned to the "flame" position, the solenoid valve 54 is controlled by a combustion control unit (not shown). The current is passed through to keep the forced open state (see step S7 in FIG. 7). Thereafter, when the electromotive force of a thermocouple (not shown) provided near the flame opening of the pilot burner 38 becomes equal to or higher than a predetermined solenoid valve maintenance voltage as described above, the energization of the combustion control unit is stopped. That is, even if the hand is released from the instrument plug knob 48 in step S11 of FIG. 7 due to the energization of the combustion control unit before the electromotive force of the thermocouple is generated or the electromotive force of the thermocouple (excluding the pushing down force). The electromagnetic valve 54 is kept open (see steps S22 and S23 in FIG. 8). However, although the current flows as described above immediately after the solenoid valve 54 is opened, the energization is stopped when the electromotive force of the thermocouple becomes equal to or higher than the solenoid valve maintenance voltage. When the voltage drops below the electromagnetic valve maintenance voltage, the electromagnetic valve 54 operates in the closing direction.

  The energization of the solenoid valve 54 and the electromotive force of the thermocouple are only kept open, and even if the energization or the electromotive force equivalent of the thermocouple is given with the instrument plug knob 48 not pushed down. It is not open. Further, the thermocouple may be eliminated and the pilot burner 38 may be kept open with a current only by control of a combustion control unit (not shown) during combustion of the pilot burner 38.

  Further, when the instrument plug knob 48 is turned to the “hot water supply / shower” or “chasing” position, the fuel gas passes through the gas main passage formed in the closing member 53 according to the rotation angle of the instrument plug knob 48. The hot water supply main burner 10 and the bath main burner 39 are supplied through the gas passages 32 and 37. For example, when the appliance plug knob 48 is moved from the “flame” to the “hot water supply / shower” position in step S1 in FIG. 9, the appliance plug switch 52b is turned on during the movement (52a off, 52b on, 52c on). The pilot burner 38 is opened by opening the water pressure automatic gas valve 33 (see step S8 in FIG. 9) that opens and closes with a differential pressure generated in response to the water flow generated by opening the hot water tap 9 (see step S7 in FIG. 9). Ignites the hot water supply main burner 10.

  Further, as shown in FIG. 11, when the instrument plug knob 48 is moved to the “tracking” position in step S1, the instrument plug switch 52c is turned off during the movement (52a off, 52b on, 52c off). As shown in step S2, the gas passage 37 is opened (opened), whereby gas is supplied to the bath main burner 39, and the ignition of the pilot burner 38 ignites the bath main burner 39 (see step S3).

  As described above, an ignition operation for moving the appliance plug knob 48 from the “fire” position to the “hot water supply / shower” position and moving the appliance plug 34 from the ignition position to the ignition position of the hot water supply main burner 10, When an ignition operation is performed in which the appliance plug 34 is moved from the ignition position to the ignition position of the bath main burner 39 by moving it from the “flaming” position to the “following” position, Performs an ignition operation.

  Further, as shown in FIG. 12, when the instrument plug knob 48 is returned to the “stop” position in step S1, both the instrument plug switches 52b and 52c are turned off and the gas passage 36 is closed (see step S2, see FIG. 12). In step S3, when the instrument plug knob 48 is released from the hand, the instrument plug switch 52a is also turned off, the electromagnetic valve 54 is also closed (see step S4), and the fire is extinguished (see step S5). Table 2 shows the on / off states of the appliance plug switches 52b and 52c at the “stop”, “flame”, “hot water / shower”, and “chasing” positions of the appliance plug knob 48. . The on / off states of the appliance plug switches 52a, 52b and 52c are also shown in FIGS. 8, 9, and 12. In FIGS.・ The notation of “shower” is omitted and “hot water supply” is indicated. In the combustion apparatus, the notation of the instrument plug knob 48 may be “hot water supply” instead of “hot water supply / shower”.

  In this combustion apparatus, when a water tap (not shown) is opened, water flows through the water supply passage 8, the water governor 15, and flows into the primary chamber 13 a of the diaphragm case 13 and is branched by the water amount regulator 23. One of them passes through the passage 16 and is led to the hot water supply passage 11 side. The other is led to the hot water supply passage 11 side through the water supply introduction passage 19 and the hot water supply heat exchanger 7, and flows from the hot water supply passage 11 to the hot water discharge pipe 30 (or the shower side passage 31) to be discharged.

  In addition, the fuel gas flows to the position where the water pressure automatic gas valve 33 is disposed by setting the appliance plug knob 48 to the position of “hot water supply / shower”. When the hot water tap 9 is opened in this state and water begins to flow through the water supply passage 8, this water passes through the passage 16 from the primary chamber 13 a of the diaphragm case 13, and the low pressure obtained by the pressure loss due to water flow is reduced by the passage 16. The pressure is transmitted to the secondary chamber 13b, and the differential pressure from the primary chamber 13a (high pressure) acts as a load depending on the area of the diaphragm 14, and the diaphragm 14 moves to the secondary chamber 13b side.

  As a result, the automatic water pressure gas valve 33 connected to the diaphragm 14 is opened, and fuel gas is supplied to the hot water supply main burner 10 through the gas passage 32. As described above, the hot water supply main burner 10 is ignited from the ignition of the pilot burner 38. To do. As described above, the hot water supply main burner 10 starts combustion when the amount of water flowing (introduced into the combustion device) by opening the hot water tap 9 becomes equal to or higher than a predetermined set operating flow rate. The water passing through the hot water supply heat exchanger 7 is heated by the combustion of the hot water supply main burner 10 and discharged from the hot water discharge pipe 30 (or the shower side passage 31).

  Although not shown in FIG. 5, the bath reheating heat exchanger 40 is connected to the bathtub through the bath circulation passage, and the hot water is moved to a position higher than the connection portion (upper circulation port) by, for example, 10 cm or more. Alternatively, the fuel gas is supplied to the bath main burner 39 through the passage 36 by setting the instrument plug knob 48 to the “pick-up” position in the state where water has been put in, and as described above, from the fire of the pilot burner 38. The bath main burner 39 is ignited, and the hot water in the bathtub is heated by circulating through the bath-heating heat exchanger 40.

  Note that in a combustion apparatus such as a balance-type bath pot, a balance-type bath pot provided with an ignition plug for igniting the pilot burner 38 with piezoelectric sparks is used instead of the igniter electrode 43. In the case of the combustion apparatus having the above-described configuration, the instrument plug knob 48 is set to the “flame” state, and the handle of the ignition device is manually rotated to strike the piezoelectric element, and the generated high voltage is applied to the ignition plug. It has a structure that can ignite by sparks. Note that even if the rotation speed is changed manually, the voltage generated from the piezoelectric element, that is, the voltage discharged from the spark plug does not change.

Japanese Patent Laid-Open No. 2000-346459 JP-A-11-2111080 Japanese Patent Laid-Open No. 10-169974 JP 2009-264610 A JP 2000-193233 A Japanese Patent Laid-Open No. 2005-83595 JP 2007-127324 A

  By the way, in the balance-type bath pot under development as described above, it was continuously reported that the pilot burner 38 was not ignited (ignition failure) even though the pilot burner 38 was ignited. When the fuel gas supplied to the pilot burner 38 is not ignited, the raw gas continues to be supplied in response to the ignition operation. When the fuel gas is propane gas, the raw gas is burned. Accumulate at the bottom. If the pilot burner 38 is ignited for the first time when the ignition operation is performed again in this state, the accumulated fuel gas will ignite at once, making a loud noise and disturbing the neighborhood, or surprised by people walking nearby. There was a case that trouble occurred.

  In addition, when the ignition operation is performed on the hot water supply main burner 10 or the bath main burner 39, the main burners 10 and 39 may not be ignited. Since the raw gas will continue to be supplied in response to the ignition operation while the supplied fuel gas is not ignited, it is desirable to avoid igniting at once. Further, the flame disappears during the combustion of the main burners 10 and 39 (the flame extinguishes despite the ignition of the pilot burner 38) as shown by the arrow W in FIG. It is considered that the fuel gas fluctuated by the wind that entered from outside and flowed in the case of the combustion device (combustion chamber), and the fluctuation was increased as shown in FIG. 6 (b). Since it is easy to touch the burner's flame outlet, once the flame disappears, a lot of gas is released by the time the misfire is detected, and it is considered to be a condition that is not suitable for use, such as a typhoon. I want to avoid using it. In addition, although the pilot burner 38 is ignited, a factor in the case where the main burners 10 and 39 are not ignited is caused by a plurality of flame outlets (for example, first to third flame outlets) of the pilot burner 38. ) Of the flame of the pilot burner 38 and the fuel gas supplied to the main burner 10, 39 even if only the flame of the crater facing the main burner 10, 39 disappears by the wind or not There may be factors such as the flow of wind entering between them and no fire.

  However, when such an ignition failure, ignition failure (fire transfer failure) or flame extinguishment occurs, these situations are accurately judged, and use in inappropriate situations such as typhoons is avoided, and No combustion apparatus has been proposed that can prevent the occurrence of problems such as a loud ignition sound during re-ignition.

  The present invention has been made to solve the above-mentioned problems, and its purpose is to use it in an improper situation in which ignition failure, ignition failure, or extinction of flame occurs, and subsequent large ignition during reignition. An object of the present invention is to provide a combustion apparatus that can prevent the occurrence of troubles such as sound generation.

In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, the first invention, the combustion chamber, a pilot burner for pilot flame and the main burner for ignition by the flame of the pilot burner, an ignition means is provided for igniting the pilot burner, fuel in the pilot burner An ignition operation for the pilot burner is performed when an ignition operation is performed to move the appliance plug from the fire extinguishing position to the ignition position. And performing an ignition operation of igniting the pilot burner to the main burner supplied with fuel gas when an ignition operation is performed to move the appliance plug from the ignition position to the ignition position of the main burner. In the combustion apparatus, the pilot burner was not ignited even though the pilot burner was ignited. Of the number of failures, the number of ignition failures in which the main burner was not ignited despite the ignition operation to the main burner, and the number of flame extinguishing times in which the flame disappeared during the combustion of the main burner There are frequency detection means for detecting two or more including at least one of the ignition failure frequency and the ignition failure frequency, and the ignition failure frequency and the ignition as conditions for determining prohibition of the reignition operation to the pilot burner. Two or more judgment reference times including at least one of the ignition failure frequency and the ignition failure frequency among the failure frequency and the flame extinction frequency are set, and the detected value of the ignition failure frequency and the ignition failure detected by the frequency detection means are set. The detected value of the number of times and the detected value of the number of times the flame disappears are distinguished from each other, and each detected value is compared with the corresponding number of times of determination. However, when the number of times corresponding to the determination criterion is reached, combustion of all the burners is forcibly stopped, and even if a reignition operation of the pilot burners is performed thereafter, the setting prohibition period is set to ignite the pilot burners by the ignition means. A combustion forbidden prohibition control means for forcibly prohibiting the operation, and the reference number of times of the number of ignition failures is the value of the case of the combustion apparatus that is released from the pilot burner and accommodates the burner for each ignition failure. The height of the surface of combustible raw gas accumulated and accumulated on the bottom side is lower than that of the flame burner near the flame burner of the pilot burner and is not ignited by the flame of the pilot burner. The ignition failure frequency value is set such that the total amount of raw gas released is high. The reference number of times of the ignition failure frequency is set to the main bar for each ignition failure. The height of the surface of combustible raw gas discharged from the burner and accumulated on the bottom side of the case of the combustion device housing the burner is higher than that of the flame burner near the flame burner of the pilot burner. It is a means to solve the problem with a configuration that is set at a low level and set to the value of the number of defective ignitions so that the total amount of released raw gas is not ignited by the flame of the pilot burner. .

According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the forced combustion prohibition control means releases the forced prohibition of the ignition operation of the pilot burner after a set prohibition period has elapsed. And Furthermore, the third invention in addition to the configuration of the first or second invention, the combustion forcible prohibition control means, wherein when the forcibly stopping the combustion of the burner by one of misfires and misfires After the elapse of a setting prohibition period set in advance as the time required to ventilate the raw gas of the fuel that has left the burner and stored at the bottom of the case of the combustion apparatus containing the burner by an ignition or ignition operation, or , After the elapse of the preset prohibition period as an interval time to judge whether or not the improper use environment of the combustion device where the flame extinguishes when the burning of the burner is forcibly stopped due to flame extinction failure Is characterized in that the ignition operation of the pilot burner is not prohibited.

  Furthermore, in addition to the configuration of the first, second or third invention, the fourth invention moves the instrument plug from the fire extinguishing position to the ignition position and performs an ignition operation to the pilot burner once. The pilot burner cannot be re-ignited until the appliance plug is returned from the ignition position to the fire-extinguishing position. Further, in a fifth aspect of the invention, in addition to the configuration of any one of the first to fourth aspects, the ignition means is formed by an igniter, and the combustion forbidden control means forcibly energizes the igniter. The ignition operation of the pilot burner is forcibly prohibited by prohibiting the operation of sparking by the igniter electrode.

According to the present invention, the number of ignition failures in which the pilot burner is ignited but not ignited, and the ignition is performed even though the main burner is ignited. ignition and bad times that were not cracks, the detected two or more including at least one of ignition defective ignition failure of the flame extinction times the flame is extinguished during the combustion of the main burner, by distinguishing each detected value, the burner This is compared with a predetermined number of times of judgment given in advance for prohibiting the forced combustion stop and reignition operation. When at least one of the detected values reaches the corresponding number of times of determination, the combustion of all the burners is forcibly stopped, and the pilot burner is then re-ignited after that. Since the ignition operation of the pilot burner by the ignition means is forcibly prohibited during the setting prohibition period, it is used in an inappropriate situation where ignition failure or ignition failure or flame extinguishment occurs, or large ignition during subsequent reignition It is possible to reliably prevent troubles such as sound generation.

  In addition, each time the instrument plug is moved from the fire extinguishing position to the ignition position and the pilot burner is ignited once, the instrument burner must be returned from the ignition position to the fire extinguishing position before the pilot burner is re-ignited. By adopting a configuration that does not allow operation, the instrument plug must be returned from the ignition position to the fire extinguishing position once during the reignition operation of the pilot burner, so that the fuel gas is naturally ventilated during this period. It is possible to reduce the rate at which raw gas accumulates due to poor ignition of the pilot burner, and it is even more certain that a loud ignition sound will be generated by reigniting the raw gas accumulated due to poor ignition at once. Can be prevented.

  Further, the ignition means is used as an igniter, and the forced combustion prohibition control means prohibits the ignition operation of the pilot burner by prohibiting the ignition operation of the pilot burner. The prohibition of the ignition operation can be performed very easily and accurately.

It is a block diagram which shows the control structure of one Example of the combustion apparatus which concerns on this invention. It is the perspective view (a) for demonstrating the burner applied to the Example, and the plane explanatory drawing (b) of a pilot burner. It is explanatory drawing which shows typically the structure of the burner shown in FIG. It is a top view which shows the example of the instrument plug knob of a combustion apparatus. It is a system block diagram of the balance type bathtub which is a combustion apparatus under development. It is explanatory drawing which shows typically the state of the fuel gas when a wind flows in a combustion apparatus, and the state of the fuel gas at the time of a disappearance occurring. FIG. 9 is a flowchart showing an example of an ignition operation of the combustion apparatus of the embodiment together with FIG. 8. It is a flowchart which shows the example of the ignition operation of the combustion apparatus of an Example with FIG. It is a flowchart which shows the hot water supply operation example of the combustion apparatus of an Example with FIG. It is a flowchart which shows the hot-water supply operation example of the combustion apparatus of an Example with FIG. It is a flowchart which shows the reheating operation example of the combustion apparatus of an Example. It is a flowchart which shows the fire-extinguishing operation example of the combustion apparatus of an Example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the present embodiment, the same reference numerals are assigned to the same names as those in the conventional example, and the duplicate description is omitted or simplified.

  The combustion apparatus of the present embodiment has a configuration in which a hot water supply side frame rod electrode 5 is added to the system configuration of the combustion apparatus shown in FIG. In addition, the present embodiment has a burner configuration as shown in FIGS. 2A and 3 and a pilot burner configuration as shown in the plan view of FIG. The frame rod electrode is referred to as a pilot side frame rod electrode.

  As shown in FIGS. 2 and 3, in this embodiment, the pilot burner 38 has first, second, and third flame ports 1, 2, and 3, and when using a thermocouple, The crater 1 is provided with a thermocouple 44 that detects the heat of the flame that comes out of the first crater 1, and the second crater 2 detects a flame that comes out of the second crater 2. A pilot-side frame rod electrode 4 is provided, and an igniter electrode 43 for igniting the pilot burner 38 is provided in the third flame port 3. The hot water supply main burner 10 is provided with a hot water supply side frame rod electrode 5 for detecting a flame coming out of the hot water supply main burner 10 near the pilot burner 38 at the flame outlet.

  The location of the hot water supply side frame rod electrode 5 is not necessarily the vicinity of the pilot burner 38. Further, in the case where a thermocouple is not used in this embodiment, for example, a pilot side frame rod electrode 4 for detecting flames emitted from the first flame port 1 and the third flame port 3 is provided (two electrodes 4 are provided). An igniter electrode 43 for igniting the pilot burner 38 may be provided on the second flame outlet 2.

  In this embodiment, the instrument plug 34 is not moved from the ignition position to the fire extinguishing position every time the instrument plug 34 is moved from the fire extinguishing position to the ignition position and the pilot burner 38 is ignited once. (That is, the instrument plug knob 48 must be returned from the “flame” position to the “stop” position), so that the reignition operation of the pilot burner 38 cannot be performed.

  Further, in the present embodiment, as shown in FIG. 1, the number-of-times detecting means 61, the memory unit 62, the combustion forced prohibition control means 63, the valve closing control means 64, the timepiece mechanism 65, and the energization means 66 are included in the control device 55. It has a provided control configuration.

  The number-of-times detecting means 61 includes the number of times of ignition failure in which the pilot burner 38 was not ignited even though the pilot burner 38 was ignited, and the hot water supply main burner 10 was ignited. Nevertheless, the number of ignition failures where the hot water supply main burner 10 was not ignited and the ignition failure where the bath main burner 39 was not ignited even though the bath main burner 39 was ignited. The number of times and the number of flame extinguishing times when the flame has disappeared during combustion of at least one of the hot water supply main burner 10 and the bath main burner 39 are detected.

  Specifically, the frequency detection means 61 receives an ON signal and an OFF signal of the appliance plug switch 52 (52a, 52b, 52c), and performs an ignition operation of the pilot burner 38 by manual operation of the appliance plug 34 or a hot water supply main burner 10. It is detected that the ignition operation of the bath main burner 39 has been performed.

  For example, when the instrument plug switch 52c is turned on after the instrument plug switch 52a is turned on (the instrument plug switch 52b is turned off), the number-of-times detecting means 61 is shown in Table 1, Table 2, FIG. As shown in FIG. 9, it is detected that the instrument plug knob 48 is operated to the “flame” position and the ignition operation to the pilot burner 38 is performed. In this case, the number detection means 61 detects whether or not the pilot burner 38 has been ignited by the discharge from the igniter electrode 43 by using the pilot side frame rod electrode 4 (see step S8 in FIG. 7). When flame detection by the flame rod electrode 4 is not performed (when no flame is detected and, for example, after 5 seconds as shown in step S12 of FIG. 7), the pilot burner 38 is not ignited. Judgment is made (see step S13 in FIG. 7) and counted as the number of ignition failures. The number detection means 61 may determine whether the pilot burner 38 has been ignited based on the electromotive force of the thermocouple 44.

  In addition, after the ignition operation of the pilot burner 38, the appliance plug switch 52a is turned off, the appliance plug knob 48 is operated to the "hot water / shower" position, and the appliance plug switch 52b is turned on in addition to the appliance plug switch 52c being turned on. When the water self-valve switch 51 is turned on (see Tables 1 and 2), the frequency detection means 61 detects that the hot water supply main burner 10 has been ignited. In this case, the frequency detection means 61 detects whether or not the ignition operation is normally performed on the hot water supply main burner 10 by the hot water supply side frame rod electrode 5 (see step S9 in FIG. 10), and in step S10 in FIG. If no flame is detected by the hot-water supply side frame rod electrode 5 even after 3 seconds, it is determined that the hot-water supply main burner 10 has not been ignited (see step S11 in FIG. 10). The number of ignition failures is counted as 10 (see step S12 in FIG. 10).

  Further, after the hot water supply main burner 10 is ignited, when the hot water supply main burner 10 detects a flame extinguishing state by the hot water supply side frame rod electrode 5, that is, the appliance plug switch 52a is turned off and the appliance plug switches 52b and 52c are turned on. When the water supply main burner 10 should be burning when the water self-valve switch 51 is on, the flame detection signal from the hot water supply side frame rod electrode 5 is not output (see FIG. 10). It is determined that the flame extinguishing of the hot water supply main burner 10 has occurred (see step S16 in FIG. 10), and counted as the number of times of extinguishing the flame of the hot water supply main burner 10.

  Then, the number detection means 61 adds the number of ignition failures, the number of ignition failures, and the number of times of extinction detected (counted) as described above to the combustion forced prohibition control means 63.

  Further, in this embodiment, the conditions for determining the forced combustion stop of all the burners 10, 38, 39 and the prohibition of the reignition operation to the pilot burner 38 are the number of ignition failures, the number of ignition failures, and the flame extinguishing. The determination reference number may be set in advance for each number of times. For example, as an example of the judgment reference number, the judgment reference number for the ignition failure number is set to 10, the judgment reference number for the ignition failure number is set to three, and the judgment reference number for the flame extinction number is set to one, and these values are stored in the memory unit. 62 may be stored in advance.

  The combustion forbidden prohibition control means 63 distinguishes the detected value of the number of ignition failures detected by the number of times detection means 61, the detected value of the number of ignition failures, and the detected value of the number of times of flame extinction, respectively, and corresponds to each detected value. Compared with the number of times of judgment (for example, the number of times of judgment of ignition failure is 10 times, the number of times of judgment of ignition failure is 3 times, the number of times of judgment of flame extinction is 1), and at least one of the detected values is When the corresponding number of determination criteria is reached (see step S15 in FIG. 7 and step S13 in FIG. 10), a command is given to the valve closing control means 64, and the electromagnetic valve 54 is forcibly closed by the valve closing control means 64, The combustion of all the burners 10, 38, 39 is forcibly stopped (see step S16 in FIG. 7). Since the reference number of times of extinction of the flame is set to 1, when it is determined that the extinction of flame has occurred in step S16 of FIG. 10, the process proceeds directly to step S16 of FIG.

  In addition, the forced combustion prohibition control means 63 performs a predetermined setting prohibition period (for example, 5 minutes) even if the reignition operation of the pilot burner 38 is performed together with the forced stop operation of the burners 10, 38, 39. Forcibly prohibits the ignition operation of the pilot burner 38 by forcibly prohibiting energization of the igniter as the ignition means. That is, the combustion forced prohibition control means 63 takes in the time detected by the timepiece mechanism 65, and forcibly prohibits the energization of the igniter (ignition transformer) (not shown) by the energization means 66 during the setting prohibition period. By prohibiting the operation of sparking by the electrode 43, the ignition operation of the pilot burner 38 is forcibly prohibited. In this way, for example, by setting a setting prohibition period of 5 minutes and forcibly prohibiting the ignition operation of the pilot burner 38 (see step S21 in FIG. 7), ventilation of the fuel gas accumulated at the bottom of the case during this period Make sure.

  Note that the number of determination criteria for each of the number of ignition failures, the number of ignition failures, and the number of flame extinctions as described above is set based on the following matters. In the example, a large amount of fuel gas (raw gas) that generates a loud ignition sound, etc. is accumulated under the burner's flame outlet, and a large ignition sound is generated when the raw gas is ignited at once, It is possible to reliably prevent problems such as a blackout during bathing and slipping in the dark.

First, the setting of the determination reference number for the number of ignition failures will be described. The calorific value of propane gas is 23680 kcal / Nm ^3. On the other hand, in the case of the pilot burner 38 having a bottom area of 540 mm × 230 mm and a height from the bottom surface to the flame outlet of 70 mm, for example, the flame of the pilot burner 38 The volume of the space formed below the mouth (to which gas can flow) is 540 × 230 × 70 = 0.0669694 m ³ . When the calorie generated by the heat generated by the pilot burner 38 is 250 kcal / h (h is time), the combustion limit (also referred to as the explosion limit) is, for example, 1.8% (the propane gas combustion limit is usually 9.5). ~ 2.1%, but it may be about 1.8% when butane is mixed), the combustible raw gas that accumulates on the bottom of the instrument is 250 [kcal / h] ÷ 60 [min (min) / h ] ÷ 23680 [kcal / Nm ³ ] ÷ 1.8% (0.018) = 0.0001775Nm ³ / min.

The generation of raw gas due to poor ignition of the pilot burner 38 causes a problem that a loud noise is generated when the pilot burner 38 is ignited (hereinafter also referred to as abnormal ignition). The case where the dense raw gas released becomes thin (for example, 1.8% of the lower limit of combustion limit because it is released over time), the bottom area of the instrument, the flame outlet of the pilot burner 38 and the bottom of the instrument , The amount of gas consumed by the pilot burner 38, and the combustion limit, the time when abnormal ignition is expected to occur is 53 seconds (0.008694 m ² ÷ 0.009775 m ² × 60 seconds). = 53 seconds).

  In this embodiment, since the determination time (ignition failure detection time) required for determining the ignition failure of the pilot burner 38 is 5 seconds at a time, the ignition failure of the pilot burner 38 occurs 10 times continuously. 50 seconds, which is shorter than the time (53 seconds) in which it is assumed that abnormal ignition of the pilot burner 38 occurs due to generation of raw gas due to poor ignition of the pilot burner 38. Therefore, even if the pilot burner 38 is ignited after the ignition failure of the pilot burner 38 occurs ten times continuously, the abnormal ignition does not occur.

  It should be noted that the determination time required for determining the ignition failure of the pilot burner 38 is 5 seconds per time, but there are also users who release their hands in, for example, 2 seconds. In such a case, it may be locked at a total time (time when 52a and 52b are ON) 50 seconds (2 seconds + 5 seconds +...). In other words, instead of the number of times of judgment for each of the number of ignition failures, the number of ignition failures, and the number of flame extinguishing times, a judgment reference time shorter than the time when abnormal ignition is expected to occur may be used.

  Further, in this embodiment, as described above, every time the pilot burner 38 is ignited once, the instrument plug knob 48 must be returned from the “flame” position to the “stop” position. 38, the instrument plug knob 48 is naturally ventilated during the work of returning the instrument plug knob 48 from the “flame” position to the “stop” position, further improving safety and ensuring that the pilot burner 38 is Ignition can be prevented.

  In this embodiment, if the control device 55 is turned off by the operation of returning the instrument plug knob 48 from the “flame” position to the “stop” position, the number of detections by the number detection means 61 is reset. Therefore, for example, even if the power is turned off, the number-of-times detecting means 61 is configured to store the number of times of detection for the set storage time of, for example, 1 minute. That is, if the ignition operation of the pilot burner 38 is repeated again within the set storage time, the number of ignition failures detected by the number detection means 61 is continuously stored. If the pilot burner 38 is not ignited within the set storage time (in the case of a user who performs the reignition operation after a long time exceeding the set storage time), the operation until the reignition operation is performed. The fuel gas will be ventilated during this period, and there will be no problem that the fuel gas accumulates at the bottom of the burner and makes a loud noise during ignition as in the case where the reignition operation is continuously repeated. It is done.

  Further, the set storage time may be varied according to the number of times stored by the number detecting means 61. In other words, after the ignition failure of the pilot burner 38 has occurred 9 times continuously, and after the set storage time of 1 minute has elapsed, the pilot burner 38 again has 9 consecutive ignition failures, the ventilation time (for example, per ignition failure) 0.5 minutes = Initial value of setting prohibition period (for example, 5 minutes) ÷ number of determination criteria (for example, 10 times)) is insufficient. Therefore, the number of times that the ignition failure has occurred continuously is set to Y times (Y is a positive integer), and the set storage time after the continuous Y times has occurred is set according to a predetermined setting prohibition period (that is, the ventilation time). Accordingly, it is preferable to change the setting storage time from a fixed value such as 1 minute as described above. For example, the setting storage time when there are nine consecutive ignition failures is the initial value of the setting prohibition period (for example, 5 minutes) × the setting storage time (for example, 1 minute) × Y times / the number of judgment references (for example, 10 times) = 4 .5 minutes is preferable. Note that monitoring may be strengthened by simply setting the setting prohibition period (for example, 5 minutes) and the setting storage time to be the same.

Next, the setting of the number of times for judging the number of ignition failures will be described. The calorific value generated by the heat generated by the hot water supply main burner 10 is usually 9.5 to 2.1% when the maximum manually set value of the capacity switching knob 49 is 15000 kcal / h (h is time), but it is dark. When the raw gas comes out instantly, it is assumed that the lower side of the gas accumulated in the lower part of the case is thicker, the upper side is thin and the combustion limit is usually 9.5%, and the average is, for example, 20.4%. The combustible raw gas accumulated on the bottom of the appliance is 15000 [kcal / h] ÷ 60 [min (min) / h] ÷ 23680 [kcal / Nm ³ ] ÷ 20.4% (0.204) = 0.586524Nm ³ / Min.

  That is, when raw gas is generated due to poor ignition (fire transfer) of the hot water supply main burner 10, a large amount of this rich raw gas is instantaneously released, so that it is as thin as the thick raw gas released from the pilot burner 38 (for example, 1. There is no time margin of 8%). As a condition for causing ignition (fire transfer) failure, it is considered that a strong wind is flowing into the case from the intake port. That is, since the wind flowing through the combustion apparatus as shown in FIG. 6A is strong, the fluctuation of the fuel gas is large as shown in FIG. 6B, and the surface of the fuel gas accumulated by the fluctuation is diluted. Easy state. That is, even if raw gas richer than 9.5 to 2.1%, which is the combustion limit, is accumulated, a part of the surface is considered to enter the combustion limit range. Assuming a slightly lower value (for example, 20.4%), the time when it is assumed that there will be a problem that the raw gas coming out from the flame outlet of the hot water supply main burner 10 will ignite at once and make a loud noise during ignition will occur. Based on the bottom area, the distance between the flame outlet of the pilot burner 38 and the bottom of the appliance, the maximum amount of gas consumed by the hot water supply main burner 10, and the concentration of gas emitted from the flame outlet of the hot water supply main burner 10, it is assumed to be 10 seconds at the shortest. .

  In this embodiment, since the determination time (ignition failure detection time) required for determining the ignition failure of the hot water supply main burner 10 is 3 seconds at a time, the ignition failure of the hot water supply main burner 10 occurs three times in succession. 9 seconds, which is shorter than the time (10 seconds) where the abnormal ignition is expected to occur. Therefore, when the ignition failure of the hot water supply main burner 10 occurs three times in succession, the solenoid valve 54 is closed, and the raw gas that has been generated due to the ignition failure of the hot water supply main burner 10 and accumulated at the bottom of the burners 10 and 39 is immediately turned on. It can prevent you from making a loud noise.

  Note that when the hot water supply main burner 10 is poorly ignited, the set storage time may be varied in accordance with the number of times the number detecting means 61 stores the same, and this is the same as when the pilot burner 38 is poorly ignited. That is, if the ignition failure of the hot water supply main burner 10 occurs again twice after the set storage time of 1 minute has elapsed after the failure of ignition of the hot water supply main burner 10 has occurred twice continuously, the ventilation time is poor. For example, 1.7 minutes is insufficient per time. (Initial value of setting prohibition period (for example, 5 minutes) ÷ number of judgment criteria (for example, 3 times) = 1.7 minutes) Therefore, the set time after the ignition failure occurs continuously Y times is set as a predetermined setting prohibition period. It is preferable to vary the set storage time according to the above (that is, according to the scavenging time), for example, by the following calculation. That is, for example, when the ignition failure occurs twice consecutively, the setting storage time is the initial value of the setting prohibition period (for example, 5 minutes) × the setting storage time (for example, 1 minute) × Y times ÷ the number of times for determination (for example, 3 times). = 3.3 minutes are preferable.

  Further, the monitoring may be strengthened by simply setting the setting prohibition period (for example, 5 minutes) and the setting storage time to be the same. Furthermore, although the determination time required to determine the ignition failure of the hot water supply main burner 10 is 3 seconds per time, there are users who close the hot water tap 9 in 2 seconds, for example. In such a case, the lock may be performed for a total time (a time during which both the micro switches 52b and 52c and the water self-valve switch 51 are ON) 10 seconds (2 seconds + 5 seconds +...).

  Further, for example, when ignition failure of the hot water supply main burner 10 occurs immediately after successful ignition of the pilot burner 38 after seven consecutive ignition failures of the pilot burner 38 (70% of the number of ignition failure determination criteria) For example, the setting of the number of ignition failure determination criteria may be changed from three times to one time. That is, if the ignition failure of the pilot burner 38 occurs seven times continuously, the raw gas combustible on the bottom surface of the appliance will reach a certain level (in this case, for example, about 70%, for example) when the ignition failure judgment reference count reaches 70%. Therefore, if the number of ignition failure determination criteria is set to 3 so that the ignition failure determination count reaches 100% of the number of ignition failure determination criteria after that, the ignition burner of the pilot burner 38 is A combustible gas with a volume larger than the space formed below is accumulated.

  Therefore, in such a case, the number of ignition failure determination reference times may be set from three times to one time. In addition, when the setting of the number of times of one ignition failure is changed from 3 times to 1 time in this way, the amount of raw gas combustible on the bottom surface of the appliance is 70% of the number of times of ignition failure determination + the number of times of ignition failure determination criteria. 33% = 103%. Similarly, for example, when ignition failure of the hot water supply main burner 10 occurs immediately after the ignition of the pilot burner 38 succeeds after the ignition failure of the pilot burner 38 has occurred four times in succession (40% of the reference number of ignition failure determination). For example, the setting of the number of ignition failure judgment criteria may be changed from 3 times to 2 times. In this case, the amount of raw gas combustible on the bottom surface of the appliance is 40% of the number of ignition failure judgment criteria + ignition. 66% = 106% of the defect judgment reference count.

  As described above, when the ignition failure of the hot water supply main burner 10 occurs immediately after the ignition to the pilot burner 38 succeeds after the ignition failure continuously occurs, the number of ignition failure determination criteria and the ignition failure determination criteria. The total amount of combustible raw gas that accumulates on the bottom of the appliance due to poor ignition and poor ignition is 103% or 106%, for example, 100% or more, and a value close to 100% As described above, the determination reference frequency may be varied by making a determination based on the amount of combustible raw gas accumulated on the bottom surface of the instrument. In addition, when it is determined that the total amount of combustible raw gas that accumulates on the bottom of the appliance due to poor ignition and poor ignition is large, such as 103% or 106%, as described above, the setting prohibition period May be variable. Further, the number of times of the determination reference may be made variable according to the installation conditions of the combustion device (wind sash installation, duct installation, etc.).

  Next, the setting of the reference number of times for the number of extinguishing flames will be described. As a condition for causing the flame extinction of the hot water supply main burner 10, fluctuation due to wind in the apparatus is considered as one factor. That is, since the wind flowing through the combustion apparatus as shown in FIG. 6 (a) is strong, the judgment reference number of times of extinction of flame is set to one, and when extinguishing of flame is detected, the burners 10 and 38 immediately. , 39 can be stopped.

  This is because, for example, the fluctuation is considered to be caused by a typhoon or the like, and if a power failure or the like occurs during bathing, it is considered to be a condition unsuitable for bathing, such as being easy to fall in the bathroom. In a device using a normal commercial power supply, it cannot be used at the same time as a power failure, so it cannot be used immediately under conditions unsuitable for bathing.However, in a device used for bathing using a battery as in the present application, It could be used even under unsuitable conditions. Therefore, in order to avoid the use in an inappropriate situation, if the extinction of the flame is detected, it can not be used immediately, and a period for re-determining whether the wind has weakened, for example, 5 minutes A setting prohibition period will be provided, and the reuse of hot water will be forcibly prohibited. The difference from the setting prohibition period due to poor ignition and poor ignition is that the setting prohibition period after extinguishing the flame is not provided for ventilation of the fuel gas accumulated at the bottom of the case.

  In addition, this invention is not limited to the said Example, It sets suitably. For example, in the above-described embodiment, the ignition means is an igniter, and the combustion forced prohibition control means 63 forcibly inhibits the energization of the igniter by the energization means 66 during the setting prohibition period, and the igniter electrode 43 performs an operation of sparking. Although the ignition operation of the pilot burner 38 is forcibly prohibited by prohibiting, the ignition operation of the pilot burner 39 may be forcibly prohibited by another method.

  In the above-described embodiment, each time the pilot burner 38 is ignited once, the instrument plug knob 48 must be returned from the “flame” position to the “stop” position before the pilot burner 38 is re-ignited. Although the configuration is such that the operation cannot be performed, this configuration may not be provided. In that case, it is preferable that the number of times of determination criteria set for the number of times of ignition failure be less than 10.

  Furthermore, the structure of the burner applied to the combustion apparatus of the present invention is not limited to the structure shown in FIGS. 2 and 3 and is set as appropriate. A configuration that can detect the disappearance may be used.

  Further, in the above-described embodiment, the number detection means 61 is configured to detect the number of ignition failures, the number of ignition failures, and the number of times of extinguishing, but may be configured to detect any one or more.

  Further, in the above embodiment, both the hot water main burner 10 and the bath main burner 39 are provided in the combustion chamber 60. However, either the hot water main burner 10 or the bath main burner 39 and the pilot burner 38 are provided. A combustion apparatus having a configuration provided in the metal combustion chamber 60 may be used.

  Furthermore, the combustion apparatus of the present invention is not limited to a balance-type bath pot (BF-W) in which the air supply / exhaust top is directly attached to the appliance, and may be a closed combustion type apparatus without a fan. It may be a chamber-type duct-type combustion device as a power source, or may be a DP (double pipe) type combustion device (BF-DP). Further, only the ignition failure of the hot water supply main burner 10 has been described, but a flame rod electrode corresponding to the bath main burner 39 may be provided to deal with the ignition failure and flame extinction of both the hot water supply and the bath. Only the bath main burner 39 may be provided with a frame rod electrode so as to cope with poor ignition and extinction of the flame only in the bath.

  The present invention avoids danger when ignition failure, ignition failure or flame extinguishment occurs, and prevents abnormal ignition due to subsequent re-ignition, so that safe combustion having functions such as bath and hot water supply Can be used as a device.

DESCRIPTION OF SYMBOLS 1 1st flame port 2 2nd flame port 3 3rd flame port 4 Pilot side frame rod electrode 5 Hot water supply side frame rod electrode 10 Hot water supply main burner 38 Pilot burner 39 Bath main burner 43 Igniter electrode 44 Thermocouple 54 Solenoid valve 55 Control Device 61 Count Detection Unit 62 Memory Unit 63 Combustion Force Prohibition Control Unit 64 Valve Close Control Unit 65 Clock Mechanism 66 Energization Unit

Claims (5)

A combustion chamber, a pilot burner for pilot flame and the main burner for ignition by the flame of the pilot burner, an ignition means is provided for igniting the pilot burner, a gas supply means for supplying fuel gas to the pilot burner An ignition plug that is manually operated, and when the ignition operation is performed to move the appliance plug from the fire extinguishing position to the ignition position, the pilot burner is ignited, and the appliance plug is ignited. In a combustion apparatus that performs an ignition operation of igniting the pilot burner to the main burner to which fuel gas is supplied when an ignition operation for moving from a position to an ignition position to the main burner is performed, to the pilot burner The number of ignition failures in which the pilot burner was not ignited even though the ignition operation was performed, and the main -The number of ignition failures in which the main burner was not ignited despite the ignition operation to the burner, and the number of ignition failures out of the number of flame extinctions in which the flame disappeared during the combustion of the main burner There are frequency detection means for detecting two or more including at least one of the ignition failure frequency, and the conditions for determining the prohibition of the reignition operation to the pilot burner are the ignition failure frequency, the ignition failure frequency, and the flame. Two or more judgment reference times including at least one of the ignition failure frequency and the ignition failure frequency among the number of times of extinction are set, and a detection value of the ignition failure frequency and a detection value of the ignition failure frequency detected by the frequency detection means, The detected values of the number of extinctions of flames are distinguished from each other, and each detected value is compared with the corresponding number of times of determination, and at least one of the detected values corresponds to the detected value. When the reference number of times is reached, the combustion of all the burners is forcibly stopped and the ignition operation of the pilot burner by the ignition means is forcibly prohibited during the setting prohibition period even if the pilot burner is re-ignited thereafter. Combustion forbidden prohibition control means is provided, and the reference number of times of the number of ignition failures is accumulated from the bottom side of the case of the combustion apparatus that is discharged from the pilot burner and accommodates the burner for each ignition failure. Total raw gas discharge with a combustible raw gas surface height level lower than that of the pilot burner in the vicinity of the pilot burner and not ignited by the pilot burner flame The number of times of ignition failure is set to be a quantity, and the reference number of times of the number of ignition failures is released from the main burner for each ignition failure and burner The height of the surface of the combustible raw gas accumulated and accumulated on the bottom side of the case of the combustion apparatus housing the combustion chamber is lower than the flame opening near the flame opening of the pilot burner, and A combustion apparatus characterized in that it is set to a value of the number of defective ignitions so that the total amount of raw gas released is not ignited by the flame of the pilot burner.   2. The combustion apparatus according to claim 1, wherein the forced combustion prohibition control means is configured to cancel the forced prohibition of the ignition operation of the pilot burner after the set prohibition period has elapsed. Combustion forcible prohibition control means, the case of a combustion device that accommodates the burner out of the burner by the ignition or ignition operations when forcibly stopping combustion of the burner by one of misfires and misfires Combustion that causes the flame to extinguish after elapse of the preset prohibition period set as the time required to ventilate the raw gas of fuel accumulated at the bottom of the burner or when the burner combustion is forcibly stopped due to flame extinction failure 2. The ignition operation of the pilot burner is not prohibited after a setting prohibition period set in advance as an interval time for determining whether or not an inappropriate use environment of the apparatus is stopped. Item 3. A combustion apparatus according to Item 2.   Each time the instrument plug is moved from the fire extinguishing position to the ignition position and the pilot burner is ignited once, the pilot burner must be reignited only after the instrument plug is returned from the ignition position to the fire extinguishing position. 4. The combustion apparatus according to claim 1, wherein the combustion apparatus is configured so that it cannot be performed.   The ignition means is formed by an igniter, and the forcible combustion prohibition control means forcibly prohibits the ignition operation of the pilot burner by forcibly prohibiting the energization of the igniter and prohibiting the operation of sparking by the igniter electrode. The combustion apparatus according to any one of claims 1 to 4, wherein

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