JP2737886B2 - Combustion state monitoring device - Google Patents
Combustion state monitoring deviceInfo
- Publication number
- JP2737886B2 JP2737886B2 JP5017686A JP1768693A JP2737886B2 JP 2737886 B2 JP2737886 B2 JP 2737886B2 JP 5017686 A JP5017686 A JP 5017686A JP 1768693 A JP1768693 A JP 1768693A JP 2737886 B2 JP2737886 B2 JP 2737886B2
- Authority
- JP
- Japan
- Prior art keywords
- combustion state
- combustor
- detection circuit
- level
- combustion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Regulation And Control Of Combustion (AREA)
- Control Of Combustion (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、燃焼器の燃焼状態を監
視する燃焼状態監視装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion state monitoring device for monitoring a combustion state of a combustor.
【０００２】[0002]
【従来の技術】従来より、バーナに熱電対を臨ませ、該
熱電対の送出する熱起電力が入力される失火検知回路の
出力が所定値以上の場合はバーナが正常燃焼状態である
とし、所定値未満の場合はバーナが異常燃焼状態（不完
全燃焼、失火等）にあるとするガス燃焼器が知られてい
る。2. Description of the Related Art Conventionally, a thermocouple is exposed to a burner, and when the output of a misfire detection circuit to which a thermoelectromotive force transmitted from the thermocouple is input is equal to or more than a predetermined value, it is determined that the burner is in a normal combustion state. A gas combustor is known in which the burner is in an abnormal combustion state (incomplete combustion, misfire, etc.) when the value is less than a predetermined value.
【０００３】[0003]
【発明が解決しようとする課題】しかし、例えば、バー
ナの燃焼中に、何らかの原因で失火検知回路が故障し、
バーナが異常燃焼状態にあるにも係わらず、失火検知回
路の出力が所定値以上を維持する場合、バーナへの燃料
供給を断てないという不具合が生じる。However, for example, during combustion of the burner, the misfire detection circuit fails for some reason,
If the output of the misfire detection circuit maintains a predetermined value or more even though the burner is in an abnormal combustion state, a problem occurs in which the fuel supply to the burner is not cut off.
【０００４】本発明の目的は、燃焼器の燃焼状態を監視
する燃焼状態監視装置の信頼性向上にある。[0004] An object of the present invention is to improve the reliability of a combustion state monitoring device for monitoring the combustion state of a combustor.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決する為、
本発明は、以下の構成を採用した。燃焼状態監視装置
は、燃焼器に近接して配され、該燃焼器が正常燃焼状態
の場合には第一レベル、異常燃焼状態の場合には第二レ
ベルの電気信号を送出する燃焼状態検出センサと、前記
電気信号を入力し、該電気信号が第一レベルであると出
力が第一所定範囲、第二レベルであると出力が第二所定
範囲となる異常燃焼検知回路と、切替信号が入力される
と、前記異常燃焼検知回路の入力側を強制的に第二レベ
ルにする切替回路と、前記異常燃焼検知回路の出力を入
力し、該出力が第二所定範囲であると前記燃焼器が異常
燃焼状態にあるとする燃焼状態判定回路とを備え、該燃
焼状態判定回路は、前記燃焼器の動作中、所定時間毎に
切替信号を送出し、該送出時に前記異常燃焼検知回路の
出力が第一所定範囲である場合、前記異常燃焼検知回路
は故障しているとする。In order to solve the above-mentioned problems,
The present invention employs the following configuration. The combustion state monitoring device is disposed close to the combustor, and outputs a first level electric signal when the combustor is in a normal combustion state and a second level electric signal when the combustor is in an abnormal combustion state. An abnormal combustion detection circuit that receives the electric signal and outputs the first predetermined range when the electric signal is at the first level and outputs the second predetermined range when the electric signal is at the second level. Then, a switching circuit for forcibly setting the input side of the abnormal combustion detection circuit to the second level, and an input of the output of the abnormal combustion detection circuit, and when the output is within the second predetermined range, the combustor is A combustion state determination circuit that determines that the combustion chamber is in an abnormal combustion state. The combustion state determination circuit transmits a switching signal every predetermined time during the operation of the combustor. If the first predetermined range, the abnormal combustion detection circuit And it has failed.
【０００６】[0006]
【作用】燃焼器に近接して配される燃焼状態検出センサ
が送出する電気信号は、燃焼器の燃焼状態が正常燃焼の
場合は第一レベル、異常燃焼状態の場合には第二レベル
となる。When the combustion state of the combustor is normal combustion, the electric signal transmitted from the combustion state detection sensor disposed in close proximity to the combustor is at the first level, and when the combustion state of the combustor is abnormal, the electric signal is at the second level. .
【０００７】燃焼状態判定回路は、異常燃焼検知回路の
出力が第一所定範囲の場合は燃焼器が正常燃焼状態にあ
ると判定し、第二所定範囲の場合は異常燃焼状態にある
と判定する。The combustion state determination circuit determines that the combustor is in a normal combustion state when the output of the abnormal combustion detection circuit is within a first predetermined range, and determines that the combustor is in an abnormal combustion state when the output is within a second predetermined range. .
【０００８】また、燃焼器の動作中、燃焼状態判定回路
は、所定時間毎に切替信号を切替回路に送出し、一時的
に異常燃焼検知回路の入力側を強制的に第二レベルにす
る。この時、異常燃焼検知回路が正常に作動しておれ
ば、その出力は第二所定範囲になる筈であるので、第一
所定範囲である場合、異常燃焼検知回路は故障している
とする。Further, during the operation of the combustor, the combustion state determination circuit sends a switching signal to the switching circuit at predetermined time intervals to temporarily forcibly set the input side of the abnormal combustion detection circuit to the second level. At this time, if the abnormal combustion detection circuit is operating normally, its output should be in the second predetermined range. If it is in the first predetermined range, it is determined that the abnormal combustion detection circuit has failed.
【０００９】[0009]
【発明の効果】燃焼状態判定回路は、燃焼器の動作中
に、所定時間毎に切替信号を送出し、該送出時に異常燃
焼検知回路の出力が第一所定範囲である場合、異常燃焼
検知回路は故障しているとする構成であるので、異常燃
焼検知回路の動作チェックを燃焼器の動作中に行なう事
ができる。The combustion state determination circuit transmits a switching signal at predetermined intervals during operation of the combustor, and when the output of the abnormal combustion detection circuit is within the first predetermined range at the time of the transmission, the abnormal combustion detection circuit. Is configured to be out of order, so that the operation check of the abnormal combustion detection circuit can be performed during the operation of the combustor.
【００１０】この為、燃焼器が正常燃焼状態の場合には
第一レベル、異常燃焼状態の場合には第二レベルの電気
信号を送出する燃焼状態検出センサの電気信号を入力す
る異常燃焼検知回路の出力が第二所定範囲となる場合に
燃焼器の燃焼状態が異常状態にあるとする燃焼状態監視
装置の信頼性が向上するとともに、燃焼器を安全に燃焼
させる事ができる。For this reason, an abnormal combustion detecting circuit for inputting an electric signal of a combustion state detecting sensor for transmitting an electric signal of a first level when the combustor is in a normal combustion state and an electric signal of a second level when the combustor is in an abnormal combustion state. The reliability of the combustion state monitoring device that determines that the combustion state of the combustor is abnormal when the output of the combustion chamber falls within the second predetermined range is improved, and the combustor can be safely burned.
【００１１】[0011]
【実施例】本発明の一実施例を、図１〜図２に基づいて
説明する。図１に示す如く、燃焼状態監視回路Ａは、燃
焼状態検出センサに相当する熱電対１と、異常燃焼検知
回路である失火検知回路２と、切替回路に相当するトラ
ンジスタ３と、燃焼状態判定回路に相当するマイクロコ
ンピュータ４とで構成される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, a combustion state monitoring circuit A includes a thermocouple 1 corresponding to a combustion state detection sensor, a misfire detection circuit 2 serving as an abnormal combustion detection circuit, a transistor 3 corresponding to a switching circuit, and a combustion state determination circuit. And a microcomputer 4 corresponding to.
【００１２】熱電対１は、クロメル- コンスタンタン等
の異種金属の両端を接合して構成され、燃焼器（図示せ
ず）に近接して配される。この熱電対１は、検出温度の
上昇に伴い熱起電力１０（電気信号）が直線的に上昇す
る特性を有し、燃焼器が正常燃焼状態している場合は、
第一レベルに相当する５５ｍＶ前後の熱起電力１０を送
出し、異常燃焼の場合には熱起電力１０は４５ｍＶ以下
（第二レベルに相当）に低下する。The thermocouple 1 is formed by joining both ends of a dissimilar metal such as chromel-constantan, and is arranged close to a combustor (not shown). The thermocouple 1 has a characteristic that the thermoelectromotive force 10 (electric signal) increases linearly with an increase in the detected temperature, and when the combustor is in a normal combustion state,
A thermoelectromotive force 10 of about 55 mV corresponding to the first level is sent out, and in the case of abnormal combustion, the thermoelectromotive force 10 drops to 45 mV or less (corresponding to the second level).
【００１３】失火検知回路２は、オペアンプ２１、抵抗
２２〜２４、失火判定レベル（本実施例では４５ｍＶ）
を調整する可変抵抗器２５等で構成され、燃焼器が正常
燃焼状態にある場合は出力電圧２０がＨｉレベルとな
り、不完全燃焼や立ち消え等の異常燃焼状態となると出
力電圧２０がＬｏレベルとなる。尚、出力電圧２０は抵
抗４１を介してマイクロコンピュータ４のＡＤポード４
２に入力される。また、本実施例では、熱起電力１０が
４５ｍＶ以下（検出温度６００℃以下）の場合を異常燃
焼状態としている。The misfire detection circuit 2 includes an operational amplifier 21, resistors 22 to 24, and a misfire determination level (45 mV in this embodiment).
The output voltage 20 is at the Hi level when the combustor is in a normal combustion state, and is at the Lo level when the combustor is in an abnormal combustion state such as incomplete combustion or extinguishment. . The output voltage 20 is supplied to the AD port 4 of the microcomputer 4 via the resistor 41.
2 is input. In the present embodiment, the case where the thermoelectromotive force 10 is 45 mV or less (the detected temperature is 600 ° C. or less) is regarded as the abnormal combustion state.
【００１４】トランジスタ３は、切替信号４０の入力に
より出力端が略導通状態になり、熱電対１の両端を略短
絡状態にする事で熱起電力１０を遮断して失火検知回路
２の入力側２６の電位を強制的に失火判定レベル以下に
する。また、切替信号４０が入力されない場合には、出
力端が略∞大になり、熱起電力１０は低下する事無く、
失火検知回路２の入力側２６に印加される。The input terminal of the transistor 3 becomes substantially conductive due to the input of the switching signal 40, and the two ends of the thermocouple 1 are substantially short-circuited to cut off the thermoelectromotive force 10 and to input the misfire detection circuit 2. 26 is forcibly reduced to the misfire determination level or less. When the switching signal 40 is not input, the output terminal becomes substantially large, and the thermoelectromotive force 10 does not decrease.
It is applied to the input 26 of the misfire detection circuit 2.
【００１５】マイクロコンピュータ４は、図２のフロー
チャートに示す様に、燃焼器が燃焼を開始して安定燃焼
状態となる所定時間経過後以降に、出力電圧２０のチェ
ック及び失火検知回路２の動作チェックを開始する。As shown in the flowchart of FIG. 2, the microcomputer 4 checks the output voltage 20 and the operation check of the misfire detection circuit 2 after a lapse of a predetermined time when the combustor starts combustion and enters a stable combustion state. To start.
【００１６】燃焼器が燃焼を開始して安定燃焼状態とな
る所定時間が経過する（ステップｓ１でＹＥＳ）と、ス
テップｓ２で１５秒タイマを始動する。ステップｓ３
で、失火検知回路２の出力電圧２０がＨｉレベルである
か否か判定し、Ｈｉレベルの場合（ＹＥＳ）はステップ
ｓ４に進み、Ｌｏレベルの場合（ＮＯ）はステップｓ９
に進む。ステップｓ４で、１５秒経過したか否か判定
し、経過している場合（ＹＥＳ）、ステップｓ５に進
み、経過していない場合（ＮＯ）、ステップｓ３に戻
る。ステップｓ５で、マイクロコンピュータ４は、トラ
ンジスタ３に切替信号を送出するとともに、０．５秒タ
イマを始動させ、ステップＳ６に進む。ステップｓ６
で、失火検知回路２の出力電圧２０がＬｏレベルである
か否か判定し、Ｌｏレベルの場合（ＹＥＳ）はステップ
ｓ７に進み、Ｈｉレベルの場合（ＮＯ）はステップｓ１
０に進む。ステップｓ７で、０．５秒経過したか否か判
定し、経過している場合（ＹＥＳ）、ステップｓ８に進
み、経過していない場合、ステップｓ６に戻る。ステッ
プｓ８で、切替信号４０の送出を停止し、ステップｓ２
に戻り、燃焼器の燃焼を継続する。ステップｓ９で、燃
焼器が失火状態になっていると判定し、ブザー（図示せ
ず）を鳴動させるとともに、電磁弁を直ちに閉弁状態に
し、燃焼器へのガス供給を停止する。ステップｓ１０
で、失火検知回路２が故障していると判定し、ブザーを
鳴動させ故障警告ランプを点灯状態にし、電磁弁を閉弁
状態にし、燃焼器へのガス供給を停止する。When a predetermined time elapses for the combustor to start combustion and enter a stable combustion state (YES in step s1), a 15-second timer is started in step s2. Step s3
Then, it is determined whether or not the output voltage 20 of the misfire detection circuit 2 is at the Hi level. If the output voltage 20 is at the Hi level (YES), the process proceeds to step s4. If it is at the Lo level (NO), the process proceeds to step s9.
Proceed to. In step s4, it is determined whether or not 15 seconds have elapsed. If it has elapsed (YES), the process proceeds to step s5, and if not (NO), the process returns to step s3. In step s5, the microcomputer 4 sends a switching signal to the transistor 3, starts a 0.5 second timer, and proceeds to step S6. Step s6
It is determined whether the output voltage 20 of the misfire detection circuit 2 is at the Lo level. If the output voltage 20 is at the Lo level (YES), the process proceeds to step s7. If the output voltage 20 is at the Hi level (NO), the process proceeds to step s1.
Go to 0. In step s7, it is determined whether or not 0.5 seconds have elapsed. If it has elapsed (YES), the process proceeds to step s8, and if not, the process returns to step s6. In step s8, the transmission of the switching signal 40 is stopped, and in step s2
And the combustion of the combustor is continued. In step s9, it is determined that the combustor is in a misfire state, a buzzer (not shown) is sounded, the solenoid valve is immediately closed, and the gas supply to the combustor is stopped. Step s10
Then, it is determined that the misfire detection circuit 2 has failed, the buzzer sounds, the failure warning lamp is turned on, the solenoid valve is closed, and the gas supply to the combustor is stopped.
【００１７】燃焼状態監視回路Ａは、以下の利点を有す
る。 （あ）失火検知回路２は、燃焼器の燃焼中、１５秒経過
する毎に切替信号４０を０．５秒間送出し（ステップｓ
５→ステップｓ６でＹＥＳ→ステップｓ７）、該送出時
に失火検知回路２の出力電圧２０がＨｉレベルとなる場
合（ステップｓ６でＮＯ）、失火検知回路２は故障して
いるとする構成であるので、失火検知回路２の動作チェ
ックを燃焼器の燃焼中行なう事ができる。この為、燃焼
器の燃焼中に、何らかの原因で失火検知回路２が故障し
て出力電圧２０がＨｉレベルに固定された場合、電磁弁
が閉弁状態になって燃焼器へのガス供給が停止するの
で、安全性に優れる。また、故障警告ランプが点灯状態
になるので、故障内容が容易に判る。The combustion state monitoring circuit A has the following advantages. (A) The misfire detection circuit 2 sends the switching signal 40 for 0.5 seconds every 15 seconds during the combustion of the combustor (step s).
5 → YES in step s6 → step s7), if the output voltage 20 of the misfire detection circuit 2 becomes Hi level at the time of the transmission (NO in step s6), the misfire detection circuit 2 is configured to be faulty. The operation check of the misfire detection circuit 2 can be performed during the combustion of the combustor. Therefore, if the misfire detection circuit 2 fails for some reason and the output voltage 20 is fixed at the Hi level during the combustion of the combustor, the solenoid valve is closed and the gas supply to the combustor is stopped. Because it is excellent in safety. Further, since the failure warning lamp is turned on, the details of the failure can be easily understood.
【００１８】（い）切替回路をトランジスタ３で構成し
ているので短絡動作を早く行なえ、失火検知回路２の動
作チェック時間（この時間中は失火判定ができない）を
短くする事ができ、失火判定に殆ど支障が無い。(I) Since the switching circuit is constituted by the transistor 3, the short-circuit operation can be performed quickly, and the operation check time of the misfire detection circuit 2 (the misfire cannot be determined during this time) can be shortened. Almost no problem.
【００１９】（う）失火検知回路２の熱起電力１０をト
ランジスタ３で短絡させて失火検知回路２の入力側２６
を強制的に失火判定レベル以下にする構成であるので、
切替回路の機構が簡単になる（トランジスタ一個）とと
もに、可変抵抗器２５を回して失火判定レベルを増減し
ても、失火検知回路２の動作チェックに関しての調整を
行なう必要がない。(C) The thermal electromotive force 10 of the misfire detection circuit 2 is short-circuited by the transistor 3 so that the input side 26 of the misfire detection circuit 2
Is forced to be equal to or lower than the misfire determination level,
The mechanism of the switching circuit is simplified (one transistor), and even if the variable resistor 25 is turned to increase or decrease the misfire determination level, there is no need to make adjustments regarding the operation check of the misfire detection circuit 2.
【００２０】本発明は、上記実施例以外に、つぎの実施
態様を含む。 ａ．燃焼状態検出センサは熱電対１以外に、フレームロ
ッド５でも良く（抵抗５１、コンデンサ５２、トランス
５３が必要）、この場合、失火検知回路６は図３に示す
様な構成となり、切替回路はトランジスタ３、３１等に
より構成される。この燃焼状態監視回路Ｂでは、正常燃
焼状態の場合、炎電流が流れて失火検知回路６の入力側
６１が低電位となり（第一レベル）、異常燃焼の場合は
炎電流が流れないので失火検知回路６の入力側６１が高
電位（第二レベル）になる。また、失火検知回路６の動
作チェックの際、切替信号４０によりトランジスタ３１
をオフして炎電流を遮断し、失火検知回路６の入力側を
強制的に高電位（第二レベル）にしている。 ｂ．切替回路は、他の半導体素子やリレー等で構成して
も良い。 ｃ．燃焼状態判定回路は、電気信号を増幅する増幅器を
有していても良い。The present invention includes the following embodiments in addition to the above embodiment. a. In addition to the thermocouple 1, the combustion state detection sensor may be a frame rod 5 (a resistor 51, a capacitor 52, and a transformer 53 are required). In this case, the misfire detection circuit 6 has a configuration as shown in FIG. 3, 31 and the like. In the combustion state monitoring circuit B, in a normal combustion state, a flame current flows and the input side 61 of the misfire detection circuit 6 has a low potential (first level). The input 61 of the circuit 6 goes high (second level). When the operation of the misfire detection circuit 6 is checked, the switching signal 40 causes
Is turned off to cut off the flame current, and the input side of the misfire detection circuit 6 is forcibly set to the high potential (second level). b. The switching circuit may be configured by another semiconductor element, a relay, or the like. c. The combustion state determination circuit may include an amplifier that amplifies the electric signal.
【図１】本発明の一実施例に係る燃焼状態監視回路の電
気回路図である。FIG. 1 is an electric circuit diagram of a combustion state monitoring circuit according to one embodiment of the present invention.
【図２】その燃焼状態監視回路の作動を示すフローチャ
ートである。FIG. 2 is a flowchart showing the operation of the combustion state monitoring circuit.
【図３】本発明の他の実施例に係る燃焼状態監視回路の
電気回路図である。FIG. 3 is an electric circuit diagram of a combustion state monitoring circuit according to another embodiment of the present invention.
Ａ、Ｂ 燃焼状態監視回路（燃焼状態監視装置） １ 熱電対（燃焼状態検出センサ） ２ 失火検知回路（異常燃焼検知回路） ３ トランジスタ（切替回路） ４ マイクロコンピュータ（燃焼状態判定回路） １０ 熱起電力（電気信号） ２６、６１ 入力側 A, B combustion state monitoring circuit (combustion state monitoring device) 1 thermocouple (combustion state detection sensor) 2 misfire detection circuit (abnormal combustion detection circuit) 3 transistor (switching circuit) 4 microcomputer (combustion state determination circuit) 10 heat generation Electric power (electric signal) 26, 61 Input side
Claims (1)
常燃焼状態の場合には第一レベル、異常燃焼状態の場合
には第二レベルの電気信号を送出する燃焼状態検出セン
サと、 前記電気信号を入力し、該電気信号が第一レベルである
と出力が第一所定範囲、第二レベルであると出力が第二
所定範囲となる異常燃焼検知回路と、 切替信号が入力されると、前記異常燃焼検知回路の入力
側を強制的に第二レベルにする切替回路と、 前記異常燃焼検知回路の出力を入力し、該出力が第二所
定範囲であると前記燃焼器が異常燃焼状態にあるとする
燃焼状態判定回路とを備え、 該燃焼状態判定回路は、前記燃焼器の動作中、所定時間
毎に切替信号を送出し、該送出時に前記異常燃焼検知回
路の出力が第一所定範囲である場合、前記異常燃焼検知
回路は故障しているとする燃焼状態監視装置。 1. A disposed in proximity to the combustor, a first level when the combustor is in a normal combustion state, in the case of abnormal combustion state and the combustion state detection sensor for delivering an electrical signal of a second level An abnormal combustion detection circuit that receives the electric signal, outputs a first predetermined range when the electric signal is at a first level, and outputs a second predetermined range when the electric signal is at a second level, and a switching signal is input. Then, a switching circuit for forcibly setting the input side of the abnormal combustion detection circuit to the second level, an output of the abnormal combustion detection circuit is input, and if the output is within the second predetermined range, the combustor is abnormal. A combustion state determination circuit that is in a combustion state. The combustion state determination circuit transmits a switching signal every predetermined time during the operation of the combustor. If it is within a predetermined range, the abnormal combustion detection circuit has failed. It is said that the combustion state monitoring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5017686A JP2737886B2 (en) | 1993-02-04 | 1993-02-04 | Combustion state monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5017686A JP2737886B2 (en) | 1993-02-04 | 1993-02-04 | Combustion state monitoring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06229542A JPH06229542A (en) | 1994-08-16 |
| JP2737886B2 true JP2737886B2 (en) | 1998-04-08 |
Family
ID=11950709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5017686A Expired - Fee Related JP2737886B2 (en) | 1993-02-04 | 1993-02-04 | Combustion state monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2737886B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR980003185A (en) * | 1996-06-25 | 1998-03-30 | 이영서 | Safety control device and method of gas machine with self test function |
| JP5378947B2 (en) * | 2009-10-26 | 2013-12-25 | リンナイ株式会社 | Gas combustion equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5416901U (en) * | 1977-07-06 | 1979-02-03 |
-
1993
- 1993-02-04 JP JP5017686A patent/JP2737886B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06229542A (en) | 1994-08-16 |
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