JPH0437333B2 - - Google Patents
Info
- Publication number
- JPH0437333B2 JPH0437333B2 JP60142883A JP14288385A JPH0437333B2 JP H0437333 B2 JPH0437333 B2 JP H0437333B2 JP 60142883 A JP60142883 A JP 60142883A JP 14288385 A JP14288385 A JP 14288385A JP H0437333 B2 JPH0437333 B2 JP H0437333B2
- Authority
- JP
- Japan
- Prior art keywords
- flame
- current
- combustion
- voltage
- output
- 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 - Lifetime
Links
- 238000002485 combustion reaction Methods 0.000 claims description 38
- 238000001514 detection method Methods 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
- F23N5/123—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods using electronic means
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Combustion (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明はガス、石油等の燃焼装置の火炎の燃焼
状態を検出する装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a device for detecting the combustion state of a flame in a gas, oil, etc. combustion device.
従来の技術
従来、フアンヒータ等の燃焼式暖房器は室内で
燃焼するため、炎の着火、失火および室内の酸素
濃度の低下、あるいは不完全燃焼の確実な検出を
必要とする。この種の検知センサとしてフレーム
ロツドセンサが広く使用されている。このセンサ
は火炎中を流れるイオン電流により燃焼状態を検
出するもので例えば実開昭59−145422号公報のよ
うなものがある。この動作を第３図、第４図を用
いて説明する。BACKGROUND ART Conventionally, since combustion type heaters such as fan heaters burn indoors, it is necessary to reliably detect flame ignition, misfire, decrease in indoor oxygen concentration, or incomplete combustion. Frame rod sensors are widely used as this type of detection sensor. This sensor detects the combustion state by means of an ion current flowing through the flame, and there is, for example, one disclosed in Japanese Utility Model Application Publication No. 145422/1983. This operation will be explained using FIGS. 3 and 4.
第３図において燃料ガスはノズル１より噴出
し、混合管２により空気と混合され、金網で形成
した燃焼板３の内部４に火炎５を形成して燃焼す
る。６は火炎中に挿入されたフレームロツドで、
燃焼板３との間に直流電源７を印加し、火炎のイ
オン電流Ifを抵抗８により検出する構成としてい
る。第４図に空気中の酸素濃度と炎イオン電流
If、バーナより発生する一酸化炭素Coの特性を示
す。ここでトローラ（図示せず）は電流Ifが相対
値で0.5以下の時は不着火、あるいは失火と判断
し、また電流Ifが７以上の時には酸素不足等によ
る異常燃焼と判断して燃焼を強制的に停止する。
あるいは電流Ifが常に一定置を保つように燃料あ
るいは燃焼空気の量を増減制御するものである。 In FIG. 3, fuel gas is ejected from a nozzle 1, mixed with air through a mixing tube 2, and burned by forming a flame 5 inside a combustion plate 3 formed of a wire mesh. 6 is a flame rod inserted into the flame,
A DC power source 7 is applied between the combustion plate 3 and the ion current I f of the flame is detected by a resistor 8 . Figure 4 shows the oxygen concentration in the air and the flame ion current.
I f indicates the characteristics of carbon monoxide Co generated from the burner. Here, the troller (not shown) determines that there is no ignition or misfire when the current I f is less than 0.5 in relative value, and when the current I f is 7 or more, it determines that there is abnormal combustion due to lack of oxygen, etc. Forcibly stop.
Alternatively, the amount of fuel or combustion air is controlled to increase or decrease so that the current If always remains at a constant level.
発明が解決しようとする問題点
しかしながら火炎電流Ifと印加する直流電流７
の電圧l0との間には第５図に示すような関係にあ
り、電圧l0が変動すると電流Ifが大きく変動し、
前述の異常燃焼の判定や制御が不能となる。また
火炎電流Ifは通常数マイクロアンペアという微小
値であり電源からの雑音により誤動作することも
多いという問題点を有していた。Problems to be solved by the invention However, the flame current I f and the applied DC current 7
There is a relationship as shown in Figure 5 between the voltage l0 and the voltage l0, and when the voltage l0 fluctuates, the current I f fluctuates greatly.
Judgment and control of the above-mentioned abnormal combustion becomes impossible. In addition, the flame current I f is usually a small value of several microamperes, and there is a problem in that it often malfunctions due to noise from the power supply.
問題点を解決するための手段
本発明の燃焼検出装置は上記問題点を解決する
ために、燃焼火炎に挿入したフレームロツドセン
サと、このセンサの電極間に電圧を印加する電源
回路と、フレームロツドセンサに流れる電流を検
出する炎電流検出回路と、この検出回路の出力に
より火炎の燃焼状態を判定する燃焼判定部を設
け、炎電流検出回路には電源回路からフレームロ
ツドセンサに印加する電圧に比例した出力を出す
基準電圧部と、フレームロツドセンサに流れる電
流Ifに応じた出力を出す電流計測部と、これ等の
出力の比を演算して燃焼判定部に出力する演算部
を有するという構成を備えたものである。Means for Solving the Problems In order to solve the above problems, the combustion detection device of the present invention includes a flame rod sensor inserted into a combustion flame, a power supply circuit that applies a voltage between the electrodes of this sensor, and a flame rod sensor inserted into a combustion flame. A flame current detection circuit that detects the current flowing to the rod sensor and a combustion determination section that determines the combustion state of the flame based on the output of this detection circuit are provided. A reference voltage section that outputs an output proportional to the voltage, a current measurement section that outputs an output according to the current I f flowing through the flame rod sensor, and a calculation section that calculates the ratio of these outputs and outputs it to the combustion determination section. It is equipped with a configuration that has the following.
作 用
本発明は上記構成により、炎電流検出回路の出
力は炎電流Ifと印加電圧l0の比の値If／l0となるた
め、印加電圧が変動してIfが変化しても出力は一
定となり、燃焼判定部は正確に燃焼状態を判定で
きるという作用を有する。Effects According to the present invention, with the above configuration, the output of the flame current detection circuit is the ratio I f /l 0 of the flame current I f and the applied voltage l 0 , so if the applied voltage changes and I f changes. The output is also constant, and the combustion determining section has the effect of accurately determining the combustion state.
実施例
以下本発明の実施例を第１図から第２図を用い
て説明していく。第１図は本発明の実施例を示す
回路のブロツク図である。図で９はフレームロツ
ドセンサでフレームロツド１０とバーナ１１によ
り電極を構成し、この電極間に流れる炎電流Ifを
検出するものである。１２はフレームロツドセン
サ９に電圧を印加する電源回路で、ここでは商品
交流電源１３を絶縁トランス１４、整流ダイオー
ドブリツジ１５、平滑コンデンサ１６により直流
電圧l0を得てフレームロツドセンサ９に電圧を供
給している。炎電流検出回路１７は電流計測部１
８と基準電圧部１９、演算部２０とからなる。電
流計測部１８はフレームロツドセンサ９と直列に
挿入された抵抗２１によりフレームロツドセンサ
９に流れる電流Ifにより生じる電圧降下を検出し
アナログ／デイジタル変換回路（以下Ａ／Ｄ回路
と呼ぶ）２２により炎電流Ifに比例したデイジタ
ル値If′に変換して演算部２０に出力する。基準電
圧部１９は電源回路１２の印加電圧l0を抵抗２
３，２４で分圧しＡ／Ｄ回路２５により印加電圧
l0と比例したデイジタル値l0′に変換して演算部２
０に出力する。２６，２７は演算増幅器で各々の
信号をインピーダンス変換している。演算部２０
では入力If′とl0′を演算するI0＝If′／l0′を行ない
燃
焼判定部２８に出力する。（演算はl0′／If′でもよ
い。）
ここでは演算部２０および燃焼判定部２８はマ
イクロコンピユータを使用して演算、判定する構
成で説明するが、これ以外にアナログ値を直接演
算、判定する回路構成でもよい。この時にはＡ／
Ｄ回路２２，２５は不要となる。Embodiments Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a block diagram of a circuit showing an embodiment of the present invention. In the figure, reference numeral 9 denotes a flame rod sensor, which constitutes an electrode by a flame rod 10 and a burner 11, and detects the flame current If flowing between the electrodes. Reference numeral 12 denotes a power supply circuit that applies voltage to the frame rod sensor 9. Here, a product AC power source 13 is connected to an isolation transformer 14, a rectifier diode bridge 15, and a smoothing capacitor 16 to obtain a DC voltage l0 , which is then applied to the frame rod sensor 9. It supplies voltage. The flame current detection circuit 17 is the current measurement section 1
8, a reference voltage section 19, and an arithmetic section 20. The current measuring section 18 detects the voltage drop caused by the current If flowing through the frame rod sensor 9 using a resistor 21 inserted in series with the frame rod sensor 9, and converts it into an analog/digital conversion circuit (hereinafter referred to as an A/D circuit). 22 converts it into a digital value I f ' proportional to the flame current I f and outputs it to the calculation section 20 . The reference voltage section 19 connects the applied voltage l0 of the power supply circuit 12 to the resistor 2.
The voltage is divided by 3 and 24 and applied by the A/D circuit 25.
It is converted into a digital value l 0 ' proportional to l 0 and sent to the calculation unit 2.
Output to 0. Operational amplifiers 26 and 27 convert the impedance of each signal. Arithmetic unit 20
Then, the input I f ' and l 0 ' are calculated as I 0 =I f '/l 0 ', and the result is output to the combustion determination section 28. (The calculation may be l 0 ′/I f ′.) Here, the calculation section 20 and the combustion determination section 28 will be explained using a microcomputer to perform calculations and judgments, but in addition to this, analog values can be directly calculated, A circuit configuration for making the determination may also be used. At this time A/
The D circuits 22 and 25 become unnecessary.
次に動作を説明する。炎電流Ifと燃焼状態との
関係は第３図で説明したが、ここで電源電圧l0が
変動すると第４図で説明したように炎電流Ifもこ
れに応じて変動する。第２図にこの状態を示す。
第２図においてＡは電流電圧l0、Ｂは炎電流If、
Ｃは演算部２０の出力I0を示し、横軸は時間Ｔを
示す。今、時間T1で電源電圧l0がl01からl02に変
動した時、炎電流Ifもl0に応じてlf1からlf2に変動
する。しかし演算部２０の出力I0はIfとl0の比の
値となるためT1では変化は出ない。同様な時間
T2においてl02からl03に変動した時、あるいは時
間T2において電源から雑音△l0が入つた時もI0は
一定値を保つ。時間T4で酸素欠乏等の異常燃焼
になつた時には炎電流Ifが増加し始める。この時
にl0は一定であるため出力I0もIfに応じて変化し、
燃焼判定部２８がしきい値IA以上になつた時T5
に異常燃焼を検知して燃焼を停止したり、異常を
報知する出力を出す。 Next, the operation will be explained. The relationship between the flame current I f and the combustion state was explained in FIG. 3, but if the power supply voltage l 0 changes, the flame current I f also changes accordingly, as explained in FIG. 4. FIG. 2 shows this state.
In Fig. 2, A is the current voltage l 0 , B is the flame current I f ,
C indicates the output I 0 of the calculation unit 20, and the horizontal axis indicates time T. Now, when the power supply voltage l0 changes from l01 to l02 at time T1 , the flame current If also changes from lf1 to lf2 in accordance with l0 . However, since the output I 0 of the arithmetic unit 20 is the value of the ratio of If and l 0 , no change occurs at T 1 . similar time
I 0 remains constant even when it changes from l 02 to l 03 at time T 2 or when noise Δl 0 is introduced from the power supply at time T 2. At time T4 , when abnormal combustion occurs due to oxygen deficiency, etc., the flame current I f starts to increase. At this time, since l 0 is constant, the output I 0 also changes according to I f ,
When the combustion determination unit 28 becomes equal to or higher than the threshold value I A T 5
It detects abnormal combustion and stops combustion, or outputs an output to notify of the abnormality.
燃焼判定部２８はこの他に出力I0が減少したこ
とを検知するしきい値を設けてもよく、また出力
I0が増減した時にこの増減の度合いに応じて供給
空気量や燃料の量を制御する空燃比制御を行なう
構成であつてもよい。さらに演算部２０ではIfと
l0との差を演算する構成でも類似の効果を得られ
る。 In addition to this, the combustion determination unit 28 may set a threshold value for detecting a decrease in the output I0 , or
The structure may be such that when I 0 increases or decreases, air-fuel ratio control is performed to control the amount of supplied air or the amount of fuel depending on the degree of increase or decrease in I 0 . Furthermore, in the calculation unit 20, I f and
A similar effect can be obtained with a configuration that calculates the difference from l 0 .
発明の効果
以上説明したように本発明の燃焼検出装置は次
のような効果を有する。Effects of the Invention As explained above, the combustion detection device of the present invention has the following effects.
(1) 演算部により炎電流Ifと、フレームロツドセ
ンサに印加する電源電圧の比を演算し、この結
果I0により燃焼状態を判定する構成であるた
め、印加電圧が変動して炎電流Ifが変化しても
出力I0は変動せず、燃焼状態の変化によるIfの
変化時にのみI0が変動するため、正確な燃焼状
態の判定ができる上に、燃焼判定部は演算部の
演算結果と一定のしきい値を比較するのみであ
るので安定したノイズに強い判定ができる。(1) The calculation unit calculates the ratio between the flame current I f and the power supply voltage applied to the flame rod sensor, and the combustion state is determined based on the result I 0 , so the applied voltage varies and the flame current Even if I f changes, the output I 0 does not change, and I 0 changes only when I f changes due to a change in the combustion state, so the combustion state can be determined accurately. Since the calculation result is only compared with a certain threshold value, a stable and noise-resistant judgment can be made.
(2) 同様に印加電圧に雑音が加わつた場合もI0は
これを除去するため数マイクロアンペア以下の
微小電流の炎電流に対しても確実な検知が可能
となる。(2) Similarly, even if noise is added to the applied voltage, I 0 removes it, making it possible to reliably detect even a small flame current of several microamperes or less.
(3) また印加電圧l0の変動の影響を受けないため
電源回路を定電圧回路にする必要がなく簡単安
価な構成でよい。さらに定電圧回路が不要であ
るためトランスにより高電圧をフレームロツド
センサに印加することも容易となり、第５図で
説明したように炎電流Ifを大きな値で検知する
ように設計可能となり、電流検知回路の簡略化
をはかれる。(3) Furthermore, since it is not affected by fluctuations in the applied voltage l 0 , the power supply circuit does not need to be a constant voltage circuit, and the configuration can be simple and inexpensive. Furthermore, since a constant voltage circuit is not required, it is easy to apply a high voltage to the flamerod sensor using a transformer, and as explained in Fig. 5, it is possible to design the flamerod sensor to detect a large value of the flame current I f . The current detection circuit can be simplified.
第１図は本発明の一実施例を示す燃焼検出装置
のブロツク回路図、第２図は同回路特性を示すタ
イムチヤート、第３図は従来の燃焼状態検出回路
の構成を説明する構成図、第４図は同回路特性
図、第５図はフレームロツドセンサの印加電圧l0
と炎電流Ifの関係を示す特性図である。
９……フレームロツドセンサ、１２……電源回
路、１７……炎電流検出回路、１８……電流計測
部、１９……基準電圧部、２０……演算部、２８
……燃焼判定部。
FIG. 1 is a block circuit diagram of a combustion detection device showing an embodiment of the present invention, FIG. 2 is a time chart showing characteristics of the circuit, and FIG. 3 is a configuration diagram explaining the configuration of a conventional combustion state detection circuit. Figure 4 is the circuit characteristic diagram, and Figure 5 is the applied voltage l 0 of the flamerod sensor.
FIG. 3 is a characteristic diagram showing the relationship between flame current I f and flame current I f . 9... Flame rod sensor, 12... Power supply circuit, 17... Flame current detection circuit, 18... Current measuring section, 19... Reference voltage section, 20... Calculating section, 28
... Combustion judgment section.
Claims (1)
の燃焼状態を検出するフレームロツドセンサと、
前記フレームロツドセンサの電極間に電圧を印加
する電源回路と、前記フレームロツドサンセに流
れる電流を検出する炎電流検出回路と、前記炎電
流検出回路の出力により火炎の燃焼状態を判定す
る燃焼判定部を有し、前記炎電流検出回路は、前
記電源回路からフレームロツドセンサに印加する
電圧に比例した出力を出す基準電圧部と、前記フ
レームロツドセンサに流れる電流に応じた出力を
出す電流計測部と、これ等の出力値の比を演算し
て出力する演算部とから構成した燃焼検出装置。1. A flame rod sensor that is inserted into the combustion flame and detects the combustion state of the flame using flame ion current;
A power supply circuit that applies a voltage between the electrodes of the flame rod sensor, a flame current detection circuit that detects the current flowing through the flame rod sensor, and a combustion system that determines the combustion state of the flame based on the output of the flame current detection circuit. The flame current detection circuit includes a reference voltage section that outputs an output proportional to the voltage applied to the flame rod sensor from the power supply circuit, and an output that outputs an output proportional to the current flowing through the flame rod sensor. A combustion detection device consisting of a current measurement section and a calculation section that calculates and outputs the ratio of these output values.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14288385A JPS625013A (en) | 1985-06-28 | 1985-06-28 | Combustion detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14288385A JPS625013A (en) | 1985-06-28 | 1985-06-28 | Combustion detecting system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS625013A JPS625013A (en) | 1987-01-12 |
| JPH0437333B2 true JPH0437333B2 (en) | 1992-06-19 |
Family
ID=15325809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14288385A Granted JPS625013A (en) | 1985-06-28 | 1985-06-28 | Combustion detecting system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS625013A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54149939A (en) * | 1978-05-17 | 1979-11-24 | Sanyo Electric Co Ltd | Combustor controller |
-
1985
- 1985-06-28 JP JP14288385A patent/JPS625013A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54149939A (en) * | 1978-05-17 | 1979-11-24 | Sanyo Electric Co Ltd | Combustor controller |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS625013A (en) | 1987-01-12 |
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