JP5538456B2 - Gas combustion equipment - Google Patents

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JP5538456B2
JP5538456B2 JP2012055491A JP2012055491A JP5538456B2 JP 5538456 B2 JP5538456 B2 JP 5538456B2 JP 2012055491 A JP2012055491 A JP 2012055491A JP 2012055491 A JP2012055491 A JP 2012055491A JP 5538456 B2 JP5538456 B2 JP 5538456B2
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典政 根笹
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Rinnai Corp
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本発明は、ガス燃焼装置に関する。特に、本発明は、ガスバーナの点火処理に関する。   The present invention relates to a gas combustion apparatus. In particular, the present invention relates to a gas burner ignition process.

一般に、ガス調理器などのガス燃焼装置は、燃料ガスが供給され、点火電極により点火されて燃焼するガスバーナと、ガスバーナの燃焼状態を検知するため、ガスバーナ近傍に配設され、ガスバーナの燃焼炎に炙られて熱起電力を出力する熱電対とを有している。この種のガス燃焼装置では、燃焼運転時の失火による燃焼不良を防止するため、熱電対の熱起電力が低下すると、ガスバーナへの燃料ガスの供給を停止して使用者に異常が報知される。また、点火処理時においても、着火不良によるガス漏れを防止するため、点火開始から一定時間内に熱電対の熱起電力が所定の着火検知レベルまで上昇しなければ、ガスバーナへの燃料ガスの供給を停止して、点火処理を強制終了させている(特許文献1)。   In general, a gas combustion apparatus such as a gas cooker is provided in the vicinity of a gas burner to be supplied with fuel gas and ignited by an ignition electrode and burned, and a combustion state of the gas burner. A thermocouple that is beaten and outputs a thermoelectromotive force. In this type of gas combustion device, in order to prevent combustion failure due to misfire during combustion operation, when the thermoelectromotive force of the thermocouple decreases, the supply of fuel gas to the gas burner is stopped and the user is notified of the abnormality. . In addition, even during ignition processing, in order to prevent gas leakage due to poor ignition, supply of fuel gas to the gas burner will be performed if the thermoelectromotive force of the thermocouple does not rise to a predetermined ignition detection level within a certain time from the start of ignition. The ignition process is forcibly terminated (Patent Document 1).

特開平9−222226号公報Japanese Patent Laid-Open No. 9-222226

しかしながら、ガスバーナ内や供給管のガス流路などに空気が入り込んでいた場合、点火処理中、不完全燃焼が生じ、燃焼炎が上方に延びる、いわゆるリフト現象が発生する場合がある。また、熱電対を炙る燃焼炎を形成する炎口が煮こぼれ等により詰まっていると、燃焼炎が正常に形成されない場合がある。さらに、グリル庫を有するガス調理器の場合、グリル使用時にガスコンロ用のガスバーナに点火すると、グリル庫からの排気により燃焼炎の形状が崩れる場合がある。特に、点火開始時のガスバーナへのガスの供給量は、通常、着火性を確保するため、大火の燃焼炎が形成されるガス供給量に設定されていることから、ガスバーナが着火すれば、大きな燃焼炎が形成される一方、燃焼炎の形状が崩れやすい。その結果、ガスバーナが着火しているにも関わらず、燃焼炎の高温の外炎部によって熱電対が炙られず、一定時間内に熱起電力が着火検知レベル以上となり難く、着火不良と判断されてガスバーナが消火される場合がある。そのため、使用者は点火処理を繰り返さなければならず、使い勝手が悪いという問題がある。   However, if air has entered the gas burner or the gas flow path of the supply pipe, incomplete combustion may occur during the ignition process, and a so-called lift phenomenon may occur in which the combustion flame extends upward. In addition, if the flame mouth that forms the combustion flame that burns the thermocouple is clogged due to boiling or the like, the combustion flame may not be formed normally. Further, in the case of a gas cooker having a grill cabinet, if the gas burner for the gas stove is ignited when the grill is used, the shape of the combustion flame may be destroyed by the exhaust from the grill cabinet. In particular, the amount of gas supplied to the gas burner at the start of ignition is usually set to a gas supply amount that forms a large flame to ensure ignitability. While the combustion flame is formed, the shape of the combustion flame tends to collapse. As a result, although the gas burner is ignited, the thermocouple is not blown by the high-temperature outer flame part of the combustion flame, and the thermoelectromotive force is unlikely to exceed the ignition detection level within a certain time, and it is determined that the ignition is poor. The gas burner may be extinguished. Therefore, the user has to repeat the ignition process, and there is a problem that the usability is bad.

本発明は上記課題を解決するためになされたものであり、本発明の目的は、安全性を確保しつつ、着火不良を防止して、ガスバーナの点火処理が円滑に行われるガス燃焼装置を提供することにある。   The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a gas combustion apparatus that prevents ignition failure and smoothly performs ignition processing of a gas burner while ensuring safety. There is to do.

本発明は、燃料ガスが供給され、点火手段により点火されて燃焼するガスバーナと、
前記ガスバーナの近傍に配設され、受熱温度に応じて熱起電力を出力する熱電対と、
前記ガスバーナへの燃料ガスのガス供給量を調節しながら、前記点火手段により点火を行い、前記熱電対の熱起電力が所定の着火検知レベルに達するかどうかから着火検知を行う制御ユニットと、を備えるガス燃焼装置であって、
前記制御ユニットは、点火開始時に、前記ガスバーナに所定の点火用ガス量で燃料ガスを供給しながら、前記点火手段によりガスバーナを点火し、
前記点火開始後、所定時間内に前記熱電対の熱起電力が着火検知レベルに達しない場合、前記ガスバーナへのガス供給量を前記点火用ガス量よりも絞った着火検知用ガス量に減少させ、
前記ガスバーナに前記着火検知用ガス量で燃料ガスを供給しながら、前記熱電対の熱起電力が着火検知レベルに達するかどうかを判定する、ガス燃焼装置である。
The present invention comprises a gas burner that is supplied with fuel gas and is ignited and burned by ignition means;
A thermocouple disposed in the vicinity of the gas burner and outputting a thermoelectromotive force according to a heat receiving temperature;
A control unit that performs ignition detection based on whether or not the thermoelectromotive force of the thermocouple reaches a predetermined ignition detection level while igniting by the ignition means while adjusting the gas supply amount of the fuel gas to the gas burner; A gas combustion apparatus comprising:
The control unit ignites the gas burner by the ignition means while supplying fuel gas at a predetermined ignition gas amount to the gas burner at the start of ignition.
If the thermoelectromotive force of the thermocouple does not reach the ignition detection level within a predetermined time after the ignition starts, the gas supply amount to the gas burner is reduced to an ignition detection gas amount that is narrower than the ignition gas amount. ,
It is a gas combustion apparatus that determines whether or not a thermoelectromotive force of the thermocouple reaches an ignition detection level while supplying fuel gas with the ignition detection gas amount to the gas burner.

上記ガス燃焼装置によれば、点火開始後、所定時間内に熱電対の熱起電力が着火検知レベルに達しない場合、ガスバーナへのガス供給量を点火用ガス量よりも絞った着火検知用ガス量に減少させるから、ガスバーナが着火していれば、着火検知用ガス量が供給されているときにガスバーナの炎口に形成される燃焼炎の大きさは、点火用ガス量が供給されているときのそれよりも小さくなる。従って、点火用ガス量が供給されている状態では、燃焼炎がリフトしていたり、燃焼炎の形状が崩れて、燃焼炎の内炎部で熱電対が炙られていても、ガス供給量の減少により、熱電対が燃焼炎の外炎部に炙られやすくなる。その結果、点火用ガス量でガスバーナが燃焼している場合よりも、着火検知用ガス量でガスバーナが燃焼している場合の方が、熱電対の熱起電力が早期に着火検知レベル以上になりやすい。それゆえ、熱起電力が着火検知レベルに達するかどうかから着火検知が行われるガス燃焼装置でも、ガスバーナが着火していれば、燃焼炎の形状等に起因する着火検知エラーを防ぐことができる。一方、点火開始後、ガスバーナに燃焼ガスを点火用ガス量で供給している状態で、所定時間内に熱電対の熱起電力が着火検知レベル以上になれば、燃焼運転が継続されるから、燃焼炎が正常に形成される場合の不都合もない。   According to the gas combustion apparatus, when the thermoelectromotive force of the thermocouple does not reach the ignition detection level within a predetermined time after the ignition starts, an ignition detection gas in which the amount of gas supplied to the gas burner is made smaller than the ignition gas amount. Therefore, if the gas burner is ignited, the size of the combustion flame formed in the flame outlet of the gas burner when the ignition detection gas amount is supplied is supplied with the ignition gas amount. It becomes smaller than that of time. Therefore, when the ignition gas amount is supplied, even if the combustion flame is lifted or the shape of the combustion flame collapses and the thermocouple is burned in the inner flame portion of the combustion flame, the gas supply amount The decrease makes it easier for the thermocouple to be beaten by the outer flame part of the combustion flame. As a result, the thermocouple's thermoelectromotive force quickly exceeds the ignition detection level when the gas burner is combusting with the amount of ignition detection gas compared to when the gas burner is combusting with the amount of ignition gas. Cheap. Therefore, even in a gas combustion apparatus in which ignition detection is performed based on whether the thermoelectromotive force reaches the ignition detection level, if the gas burner is ignited, an ignition detection error due to the shape of the combustion flame or the like can be prevented. On the other hand, after starting ignition, in a state where the combustion gas is supplied to the gas burner in the amount of ignition gas, if the thermoelectromotive force of the thermocouple becomes equal to or higher than the ignition detection level within a predetermined time, the combustion operation is continued. There is no inconvenience when the combustion flame is normally formed.

上記ガス燃焼装置において、好ましくは、
前記制御ユニットは、前記ガスバーナに前記着火検知用ガス量で燃料ガスを供給しているときの前記熱電対の熱起電力が着火検知レベル未満である場合、前記ガスバーナへの燃料ガスの供給を停止して、着火エラーを報知し、前記ガスバーナに前記着火検知用ガス量で燃料ガスを供給しているときの前記熱電対の熱起電力が着火検知レベル以上である場合、前記ガスバーナへの燃料ガスのガス供給量を前記着火検知用ガス量よりも多い燃焼用ガス量に増加させる。
In the gas combustion apparatus, preferably,
The control unit stops the supply of the fuel gas to the gas burner when the thermoelectromotive force of the thermocouple is less than the ignition detection level when the fuel gas is supplied to the gas burner with the ignition detection gas amount. Then, when an ignition error is reported and the thermoelectromotive force of the thermocouple when the fuel gas is supplied to the gas burner with the ignition detection gas amount is equal to or higher than the ignition detection level, the fuel gas to the gas burner The gas supply amount is increased to a combustion gas amount larger than the ignition detection gas amount.

上記ガス燃焼装置によれば、大きな燃焼炎が形成される点火用ガス量だけでなく、小さな燃焼炎が形成される着火検知用ガス量でガスバーナを燃焼させても、熱電対の熱起電力が着火検知レベル未満である場合、ガスバーナへの燃料ガスの供給が停止されて着火エラーが報知されるから、点火処理中のガス漏れの量も少なくなり、また着火不良を確実に防止することができる。一方、着火検知用ガス量でガスバーナを燃焼させて、熱電対の熱起電力が着火検知レベル以上であれば、ガスバーナへの燃料ガスのガス供給量を着火検知用ガス量よりも多い燃焼用ガス量に増加させるから、大きな燃焼炎が形成されている状態で燃焼運転を継続させることができる。   According to the gas combustion apparatus, the thermoelectromotive force of the thermocouple is not limited even when the gas burner is burned not only with the amount of ignition gas forming a large combustion flame but also with the amount of ignition detection gas forming a small combustion flame. If it is below the ignition detection level, the supply of fuel gas to the gas burner is stopped and an ignition error is notified, so the amount of gas leakage during the ignition process is reduced and ignition failure can be reliably prevented. . On the other hand, if the gas burner is burned with the ignition detection gas amount and the thermoelectromotive force of the thermocouple is equal to or higher than the ignition detection level, the amount of fuel gas supplied to the gas burner is larger than the ignition detection gas amount. Therefore, the combustion operation can be continued in a state where a large combustion flame is formed.

上記ガス燃焼装置において、好ましくは、
前記制御ユニットは、前記燃焼用ガス量が前記点火用ガス量と略同量となるようにガス供給量を調節する。
In the gas combustion apparatus, preferably,
The control unit adjusts the gas supply amount so that the combustion gas amount is substantially the same as the ignition gas amount.

上記ガス燃焼装置によれば、着火検知用ガス量で一時的に燃焼炎が小さくなっても、着火検知後は点火開始時と同程度の燃焼炎が形成されるから、使用者の違和感も少ない。   According to the gas combustion device, even if the combustion flame is temporarily reduced by the amount of gas for ignition detection, after the ignition is detected, the combustion flame is formed at the same level as at the start of ignition, so the user feels less uncomfortable. .

以上説明したように、本発明によれば、安全性を確保しつつ、着火不良を防止して、ガスバーナの点火処理を円滑に行うことができる。   As described above, according to the present invention, the ignition process of the gas burner can be performed smoothly while ensuring safety and preventing ignition failure.

図1は、本発明の実施の形態に係るガス燃焼装置の概略構成図である。FIG. 1 is a schematic configuration diagram of a gas combustion apparatus according to an embodiment of the present invention. 図2は、本発明の実施の形態に係るガス燃焼装置のガス回路図である。FIG. 2 is a gas circuit diagram of the gas combustion apparatus according to the embodiment of the present invention. 図3は、本発明の実施の形態に係るガス燃焼装置の点火処理の動作を示す制御フロー図である。FIG. 3 is a control flowchart showing the operation of the ignition process of the gas combustion apparatus according to the embodiment of the present invention.

以下、本発明のガス燃焼装置をガス調理器に適用した場合について、図面を参照しながら説明する。   Hereinafter, the case where the gas combustion apparatus of the present invention is applied to a gas cooker will be described with reference to the drawings.

図1に示すように、本発明の実施の形態に係るガス調理器は、ガステーブルの上面に、2つのガスコンロ1,3が設けられているとともに、手前側の正面に、ガステーブルの内部に設けられたグリル5へ調理物を出し入れするための開閉扉が設けられている。また、開閉扉の左右には、ガスコンロ1,3及びグリル5をそれぞれ操作するための、図示しないプッシュプッシュ機構を備える点消火ボタン11,31,51や火力調節ツマミ12,32,52の他、異常報知を行うブザー9が設けられている。また、点消火ボタン11,31,51は、押圧によってオン・オフされるマイクロスイッチ13,33,53(図2参照)と接続されている。   As shown in FIG. 1, the gas cooker according to the embodiment of the present invention is provided with two gas stoves 1 and 3 on the upper surface of the gas table, and in front of the front side, inside the gas table. An open / close door is provided for putting food into and out of the provided grill 5. Further, on the left and right of the open / close door, in addition to the fire extinguishing buttons 11, 31, 51 and the thermal power adjustment knobs 12, 32, 52 having a push push mechanism (not shown) for operating the gas stoves 1, 3 and the grill 5, A buzzer 9 for notifying abnormality is provided. Moreover, the point-extinguishing buttons 11, 31, and 51 are connected to micro switches 13, 33, and 53 (see FIG. 2) that are turned on and off by pressing.

図2は、ガス回路図であり、ガスコンロ1,3用のガスバーナ10,30及びグリル5用のガスバーナ50にはそれぞれ、燃料ガスを供給するガス管から分岐する供給管14,34,54が接続されている。なお、本実施の形態の点火処理方法は、ガスコンロ1,3に適用されているため、以下では主としてガスコンロ1,3の構成について具体的に説明する。   FIG. 2 is a gas circuit diagram, and supply pipes 14, 34 and 54 branched from gas pipes for supplying fuel gas are connected to the gas burners 10 and 30 for the gas stoves 1 and 3 and the gas burner 50 for the grill 5, respectively. Has been. In addition, since the ignition processing method of this Embodiment is applied to the gas stoves 1 and 3, the structure of the gas stoves 1 and 3 is mainly demonstrated concretely below.

ガスコンロ1,3用のガスバーナ10,30に接続されている供給管14,34には、点消火ボタン11,31の押圧により開閉するメイン弁15,35と、ガスバーナ10,30への点火開始時に開放される電磁弁よりなる安全弁16,36と、ガスバーナ10,30に供給する燃料ガスのガス供給量を調節する電磁弁よりなる流量調節弁17,37とが配設されている。また、供給管14,34には、流量調節弁17,37の前後で分岐して流量調節弁17,37と並行するバイパス路18,38が形成されており、バイパス路18,38にはオリフィス19,39が設けられている。従って、流量調節弁17,37が閉止されると、バイパス路18,38のみを通してガスバーナ10,30に燃料ガスが供給されるため、ガス供給量が減少する。一方、流量調節弁17,37が開放されると、ガス供給量が増加する。なお、既述したように、安全弁16,36及び流量調節弁17,37は電磁弁であり、これらは後述する制御ユニット7からの信号に応じて、その開度が調整される。   The supply pipes 14 and 34 connected to the gas burners 10 and 30 for the gas stoves 1 and 3 include main valves 15 and 35 that are opened and closed by pressing the fire extinguishing buttons 11 and 31, and when the ignition to the gas burners 10 and 30 is started. Safety valves 16 and 36 composed of electromagnetic valves that are opened, and flow rate control valves 17 and 37 composed of electromagnetic valves that adjust the amount of fuel gas supplied to the gas burners 10 and 30 are arranged. The supply pipes 14 and 34 are formed with bypass passages 18 and 38 that branch before and after the flow control valves 17 and 37 and are parallel to the flow control valves 17 and 37. 19 and 39 are provided. Therefore, when the flow rate control valves 17 and 37 are closed, the fuel gas is supplied to the gas burners 10 and 30 only through the bypass passages 18 and 38, so that the gas supply amount decreases. On the other hand, when the flow control valves 17 and 37 are opened, the gas supply amount increases. As described above, the safety valves 16 and 36 and the flow rate control valves 17 and 37 are electromagnetic valves, and their opening degrees are adjusted according to a signal from the control unit 7 described later.

ガスバーナ10,30近傍には、火花放電を行う点火電極20,40、及び燃焼炎に炙られて熱起電力を出力する熱電対21,41が、ガスバーナ10,30の炎口(図示せず)に臨んで配設されている。点火電極20,40は、制御ユニット7によりスパーカSPが通電制御されることで火花放電し、それによってガスバーナ10,30が点火される。これら点火電極20,40及びスパーカSPは、点火手段に対応する。   In the vicinity of the gas burners 10 and 30, there are ignition electrodes 20 and 40 that perform spark discharge, and thermocouples 21 and 41 that are burned by the combustion flame and output thermoelectromotive force, and a flame opening (not shown) of the gas burners 10 and 30. It is arranged to face. The ignition electrodes 20 and 40 are subjected to spark discharge when the control unit 7 controls the energization of the sparker SP, whereby the gas burners 10 and 30 are ignited. These ignition electrodes 20 and 40 and the sparker SP correspond to ignition means.

制御ユニット7は、図示しないが、マイコンを含み、機能的構成手段として、点消火ボタン11,31の操作に応じて、スパーカSPへの通電を制御するスパーカ制御部、安全弁16,36を開閉する安全弁駆動部、流量調節弁17,37を開閉する調節弁駆動部、熱電対21,41の熱起電力が所定の着火検知レベル以上であるかどうかを判定する着火検知部、所定の報知を行うブザー9をマイコンの指示により通電駆動するブザー駆動部や、タイマの他、所定の燃焼運転を行う燃焼運転制御部を備えており、安全弁16,36、流量調節弁17,37、点火電極20,40、熱電対21,41や、点消火ボタン11,31の操作と連動してオン・オフされるマイクロスイッチ13,33などと電気的に接続されている。   Although not shown, the control unit 7 includes a microcomputer, and opens and closes a sparker control unit for controlling energization to the sparker SP and safety valves 16 and 36 in accordance with the operation of the fire extinguishing buttons 11 and 31 as functional constituent means. Safety valve drive unit, control valve drive unit for opening and closing the flow rate control valves 17, 37, ignition detection unit for determining whether the thermoelectromotive force of the thermocouples 21, 41 is equal to or higher than a predetermined ignition detection level, and performing predetermined notification In addition to a buzzer drive unit for energizing and driving the buzzer 9 according to instructions from the microcomputer, a timer and a combustion operation control unit for performing a predetermined combustion operation are provided. Safety valves 16 and 36, flow rate control valves 17 and 37, ignition electrodes 20, 40, thermocouples 21 and 41, and microswitches 13 and 33 that are turned on and off in conjunction with the operation of the fire extinguishing buttons 11 and 31, and the like.

次に、本実施の形態のガス調理器における点火処理の動作制御について、図3の制御フロー図を参照して、具体的に説明する。なお、ガスコンロ1,3の点火処理の動作制御は同様であるため、以下では、ガスコンロ1を例に挙げて説明する。   Next, the operation control of the ignition process in the gas cooker of the present embodiment will be specifically described with reference to the control flowchart of FIG. In addition, since the operation control of the ignition process of the gas stoves 1 and 3 is the same, the gas stove 1 will be described below as an example.

使用者が点消火ボタン11を押圧して点火操作を行うと(ST1)、メイン弁15が開弁するとともに、マイクロスイッチ13がオンされて電源から通電が開始される。マイコンへの電源の供給が開始されると、制御ユニット7は、タイマをスタートさせ、スパーカSPへの給電を開始するとともに、安全弁16及び流量調節弁17に吸着電流を流すように信号を送出し、これらを開弁保持する。これにより、大火の燃焼炎となる点火用ガス量がガスバーナ10に供給され、点火電極20が火花放電して、ガスバーナ10の点火が開始される。   When the user performs an ignition operation by pressing the fire extinguishing button 11 (ST1), the main valve 15 is opened and the micro switch 13 is turned on to start energization from the power source. When the supply of power to the microcomputer is started, the control unit 7 starts a timer, starts supplying power to the sparker SP, and sends a signal so that an adsorption current flows to the safety valve 16 and the flow rate control valve 17. These are held open. As a result, the amount of ignition gas that becomes a combustion flame of a large fire is supplied to the gas burner 10, the ignition electrode 20 is sparked, and ignition of the gas burner 10 is started.

次いで、ガスバーナ10の燃焼炎により熱電対21が炙られて、熱電対21から出力される熱起電力が所定の着火検知レベル(例えば、3.5V±0.5mV)以上となっているか否かの判定が開始される(ST2)。   Next, whether or not the thermocouple 21 is burned by the combustion flame of the gas burner 10 and the thermoelectromotive force output from the thermocouple 21 is equal to or higher than a predetermined ignition detection level (for example, 3.5 V ± 0.5 mV). Is started (ST2).

ガスバーナ10の点火開始から所定の経過時間(例えば、7秒)内に、熱電対21の熱起電力が着火検知レベル以上となれば(ST2で、Yes、ST3で、No)、制御ユニット7は、ガスバーナ10の着火が完了したと判定して、スパーカSPへの給電を停止し、燃焼運転を継続する(ST8〜ST9)。   If the thermoelectromotive force of the thermocouple 21 becomes equal to or higher than the ignition detection level within a predetermined elapsed time (for example, 7 seconds) from the start of ignition of the gas burner 10 (Yes in ST2, No in ST3), the control unit 7 Then, it is determined that the ignition of the gas burner 10 is completed, the power supply to the sparker SP is stopped, and the combustion operation is continued (ST8 to ST9).

一方、ガスバーナ10に点火用ガス量で燃料ガスが供給されても、点火開始から所定の経過時間、熱電対21の熱起電力が着火検知レベル未満である場合(ST2で、No、ST3で、Yes)、制御ユニット7は、流量調節弁17への吸着電流を停止して、流量調節弁17を閉弁する(ST4)。これにより、ガス供給量が絞られ、バイパス路18のオリフィス19のみを通って燃料ガスがガスバーナ10に供給されるから、中火の燃焼炎となる着火検知用ガス量がガスバーナ10に供給される。   On the other hand, even if fuel gas is supplied to the gas burner 10 in the amount of ignition gas, when the thermoelectromotive force of the thermocouple 21 is less than the ignition detection level for a predetermined elapsed time from the start of ignition (in ST2, No, in ST3, Yes), the control unit 7 stops the adsorption current to the flow control valve 17 and closes the flow control valve 17 (ST4). As a result, the gas supply amount is reduced, and the fuel gas is supplied to the gas burner 10 only through the orifice 19 of the bypass 18, so that an ignition detection gas amount that becomes a combustion flame of the medium flame is supplied to the gas burner 10. .

ガス供給量が点火用ガス量から着火検知用ガス量に変更された後、点火開始から所定の経過時間(例えば、10秒)が経過するまで、熱電対21の熱起電力が着火検知レベル以上になるかどうかの判定が継続される(ST5〜ST6)。そして、所定の経過時間内に、熱電対21の熱起電力が着火検知レベル以上になると(ST5で、Yes、ST6で、No)、制御ユニット7は、ガスバーナ10の着火が完了したと判定して、スパーカSPへの給電を停止するとともに、流量調節弁17へ吸着電流を再度印加して、流量調節弁17を開弁する(ST7)。これにより、ガス供給量が着火検知用ガス量よりも多い燃焼用ガス量(本実施の形態では、点火用ガス量と同一のガス量)に増加されて、燃焼運転が継続される(ST9)。   After the gas supply amount is changed from the ignition gas amount to the ignition detection gas amount, the thermoelectromotive force of the thermocouple 21 exceeds the ignition detection level until a predetermined elapsed time (for example, 10 seconds) has elapsed from the start of ignition. The determination of whether or not will continue (ST5 to ST6). If the thermoelectromotive force of the thermocouple 21 becomes equal to or higher than the ignition detection level within a predetermined elapsed time (Yes in ST5, No in ST6), the control unit 7 determines that the ignition of the gas burner 10 is completed. Then, the power supply to the sparker SP is stopped and the adsorption current is again applied to the flow rate control valve 17 to open the flow rate control valve 17 (ST7). As a result, the gas supply amount is increased to a combustion gas amount that is larger than the ignition detection gas amount (in this embodiment, the same gas amount as the ignition gas amount), and the combustion operation is continued (ST9). .

一方、ガス供給量が着火検知用ガス量に変更されて、所定の経過時間が経過しても、熱電対21の熱起電力が着火検知レベル未満である場合(ST5で、No、ST6で、Yes)、制御ユニット7は、スパーカSPへの給電を停止するとともに、安全弁16への吸着電流を停止して閉弁し、ブザー9から着火エラーを報知する(ST10)。なお、燃焼炎のリフト等により着火検知レベルまで熱電対21の熱起電力が上昇しない場合、ガスバーナ10は着火している状態であるから、熱電対21は点火開始から燃焼炎に炙られていた状態にある。従って、ガス供給量を点火用ガス量から着火検知用ガス量に変更した後では、早期に着火検知レベルまで熱起電力が上昇するはずであるから、ガスバーナ10に点火用ガス量で燃料ガスが供給されているときの着火検知を判定する時間よりも短い時間で着火検知を判定できる。   On the other hand, even if the gas supply amount is changed to the ignition detection gas amount and the predetermined elapsed time has elapsed, the thermoelectromotive force of the thermocouple 21 is below the ignition detection level (in ST5, No, in ST6, Yes), the control unit 7 stops power supply to the sparker SP, stops the adsorption current to the safety valve 16 and closes it, and notifies the ignition error from the buzzer 9 (ST10). When the thermoelectromotive force of the thermocouple 21 does not rise to the ignition detection level due to the lift of the combustion flame or the like, the gas burner 10 is in an ignited state, so the thermocouple 21 has been beaten by the combustion flame from the start of ignition. Is in a state. Therefore, after changing the gas supply amount from the ignition gas amount to the ignition detection gas amount, the thermoelectromotive force should rise to the ignition detection level at an early stage, so that the fuel gas is supplied to the gas burner 10 with the ignition gas amount. It is possible to determine the ignition detection in a time shorter than the time for determining the ignition detection when being supplied.

以上のように、本実施の形態のガス燃焼装置によれば、点火開始から所定時間経過するまで大きな燃焼炎が形成される点火用ガス量で燃焼ガスをガスバーナに供給しても、熱電対の熱起電力が所定の着火検知レベルまで上昇しない場合、ガスバーナへのガス供給量が点火用ガス量から着火検知用ガス量に絞られるから、ガスバーナが着火していれば、小さな燃焼炎が形成される。従って、点火用ガス量が供給されている状態では、燃焼炎のリフトや燃焼炎の形状の崩れ等に起因して燃焼炎の内炎部で熱電対が炙られていても、ガス供給量が着火検知用ガス量に減少されることにより燃焼炎が小さくなり、燃焼炎の外炎部で熱電対が炙られやすくなる。その結果、熱電対の熱起電力が着火検知レベルまで早期に上昇するから、不完全燃焼などが生じていた場合でも、短時間で確実に着火検知することができる。   As described above, according to the gas combustion apparatus of the present embodiment, even if the combustion gas is supplied to the gas burner with the amount of ignition gas that forms a large combustion flame until a predetermined time has elapsed from the start of ignition, When the thermoelectromotive force does not rise to the predetermined ignition detection level, the gas supply amount to the gas burner is reduced from the ignition gas amount to the ignition detection gas amount, so if the gas burner is ignited, a small combustion flame is formed. The Therefore, in the state where the ignition gas amount is supplied, even if the thermocouple is burned in the inner flame portion of the combustion flame due to the lift of the combustion flame or the collapse of the shape of the combustion flame, the gas supply amount is By reducing the amount of ignition detection gas, the combustion flame is reduced, and the thermocouple is easily burned at the outer flame portion of the combustion flame. As a result, since the thermoelectromotive force of the thermocouple rises early to the ignition detection level, even if incomplete combustion or the like has occurred, it is possible to reliably detect ignition in a short time.

しかも、本実施の形態では、着火検知用ガス量で着火検知されると、ガス供給量を点火用ガス量と同程度の燃焼用ガス量に増加させるから、燃焼炎は点火用ガス量が供給されていた状態と同程度の大きさに戻る。それゆえ、使用者は短時間、燃焼炎が小さくなっても、違和感が少ない。   In addition, in this embodiment, when the ignition detection is performed with the amount of ignition detection gas, the gas supply amount is increased to a combustion gas amount comparable to the ignition gas amount, so the combustion flame is supplied with the ignition gas amount. It returns to the same size as it was. Therefore, even if the user reduces the combustion flame for a short time, the user feels uncomfortable.

また、点火開始から所定時間経過するまでは、点火用ガス量がガスバーナに供給され、その間で着火検知レベル以上の熱起電力が得られていれば、ガス供給量を減少させることなく、燃焼運転が継続されるから、使用者の使い勝手がよい。   Also, until a predetermined time has elapsed from the start of ignition, if the ignition gas amount is supplied to the gas burner, and a thermal electromotive force greater than the ignition detection level is obtained during that time, the combustion operation is performed without reducing the gas supply amount. Since it is continued, user convenience is good.

一方、ガス供給量を着火検知用ガス量に減少させて点火を行っても、熱電対の熱起電力が上昇しない場合、大きな燃焼炎が形成される点火用ガス量でも、小さな燃焼炎が形成される着火検知用ガス量でも熱電対の熱起電力が上昇しないから、着火不良が生じていると判断して、早期に点火処理を終了させることができる。これにより、生ガスの漏れも少なくなり、高い安全性を確保できる。   On the other hand, if ignition is performed by reducing the gas supply amount to the ignition detection gas amount, if the thermoelectromotive force of the thermocouple does not increase, a small combustion flame is formed even if the ignition gas amount is large. Since the thermoelectromotive force of the thermocouple does not increase even with the amount of ignition detection gas to be determined, it is determined that an ignition failure has occurred, and the ignition process can be terminated early. Thereby, the leakage of raw gas is reduced and high safety can be secured.

なお、上記実施の形態では、ガスコンロ用のガスバーナの点火処理に本発明を適用した場合について説明したが、グリル用のガスバーナに適用してもよい。また、ガス調理器以外のガスバーナを使用する、ガス温風暖房機やガス給湯器などのガス燃焼装置に適用してもよい。   In addition, although the case where this invention was applied to the ignition process of the gas burner for gas stoves was demonstrated in the said embodiment, you may apply to the gas burner for grills. Moreover, you may apply to gas combustion apparatuses, such as a gas hot air heater and a gas water heater, which use gas burners other than a gas cooker.

10,30 ガスバーナ
21,41 熱電対
20,40 点火電極
7 制御ユニット
SP スパーカ
10, 30 Gas burner 21, 41 Thermocouple 20, 40 Ignition electrode 7 Control unit SP Sparker

Claims (3)

燃料ガスが供給され、点火手段により点火されて燃焼するガスバーナと、
前記ガスバーナの近傍に配設され、受熱温度に応じて熱起電力を出力する熱電対と、
前記ガスバーナへの燃料ガスのガス供給量を調節しながら、前記点火手段により点火を行い、前記熱電対の熱起電力が所定の着火検知レベルに達するかどうかから着火検知を行う制御ユニットと、を備えるガス燃焼装置であって、
前記制御ユニットは、点火開始時に、前記ガスバーナに所定の点火用ガス量で燃料ガスを供給しながら、前記点火手段によりガスバーナを点火し、
前記点火開始後、所定時間内に前記熱電対の熱起電力が着火検知レベルに達しない場合、前記ガスバーナへのガス供給量を前記点火用ガス量よりも絞った着火検知用ガス量に減少させ、
前記ガスバーナに前記着火検知用ガス量で燃料ガスを供給しながら、前記熱電対の熱起電力が着火検知レベルに達するかどうかを判定する、ガス燃焼装置。
A gas burner supplied with fuel gas and ignited and burned by ignition means;
A thermocouple disposed in the vicinity of the gas burner and outputting a thermoelectromotive force according to a heat receiving temperature;
A control unit that performs ignition detection based on whether or not the thermoelectromotive force of the thermocouple reaches a predetermined ignition detection level while igniting by the ignition means while adjusting the gas supply amount of the fuel gas to the gas burner; A gas combustion apparatus comprising:
The control unit ignites the gas burner by the ignition means while supplying fuel gas at a predetermined ignition gas amount to the gas burner at the start of ignition.
If the thermoelectromotive force of the thermocouple does not reach the ignition detection level within a predetermined time after the ignition starts, the gas supply amount to the gas burner is reduced to an ignition detection gas amount that is narrower than the ignition gas amount. ,
A gas combustion apparatus that determines whether or not a thermoelectromotive force of the thermocouple reaches an ignition detection level while supplying fuel gas with the ignition detection gas amount to the gas burner.
請求項1に記載のガス燃焼装置において、
前記制御ユニットは、前記ガスバーナに前記着火検知用ガス量で燃料ガスを供給しているときの前記熱電対の熱起電力が着火検知レベル未満である場合、前記ガスバーナへの燃料ガスの供給を停止して、着火エラーを報知し、前記ガスバーナに前記着火検知用ガス量で燃料ガスを供給しているときの前記熱電対の熱起電力が着火検知レベル以上である場合、前記ガスバーナへの燃料ガスのガス供給量を前記着火検知用ガス量よりも多い燃焼用ガス量に増加させる、ガス燃焼装置。
The gas combustion apparatus according to claim 1, wherein
The control unit stops the supply of the fuel gas to the gas burner when the thermoelectromotive force of the thermocouple is less than the ignition detection level when the fuel gas is supplied to the gas burner with the ignition detection gas amount. Then, when an ignition error is reported and the thermoelectromotive force of the thermocouple when the fuel gas is supplied to the gas burner with the ignition detection gas amount is equal to or higher than the ignition detection level, the fuel gas to the gas burner A gas combustion apparatus that increases the gas supply amount of the gas to a combustion gas amount larger than the ignition detection gas amount.
請求項2に記載のガス燃焼装置において、
前記制御ユニットは、前記燃焼用ガス量が前記点火用ガス量と略同量となるようにガス供給量を調節するガス燃焼装置。

The gas combustion apparatus according to claim 2,
The control unit is a gas combustion apparatus that adjusts a gas supply amount so that the amount of combustion gas is substantially equal to the amount of ignition gas.

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