JPH0241474Y2 - - Google Patents
Info
- Publication number
- JPH0241474Y2 JPH0241474Y2 JP17359585U JP17359585U JPH0241474Y2 JP H0241474 Y2 JPH0241474 Y2 JP H0241474Y2 JP 17359585 U JP17359585 U JP 17359585U JP 17359585 U JP17359585 U JP 17359585U JP H0241474 Y2 JPH0241474 Y2 JP H0241474Y2
- Authority
- JP
- Japan
- Prior art keywords
- flame current
- flame
- current
- pseudo
- burner
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 21
- 238000002485 combustion reaction Methods 0.000 claims description 16
- 150000002500 ions Chemical class 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000009499 grossing Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Landscapes
- Control Of Combustion (AREA)
Description
【考案の詳細な説明】
［考案の技術分野］
本考案は、炎電流を検出して燃焼量を測定する
装置に係わり、特に電源電圧変動による炎電流の
変動を補正する補正機能付き炎電流検出装置に関
する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a device that detects flame current and measures the amount of combustion, and particularly relates to a flame current detection device with a correction function that corrects fluctuations in flame current due to fluctuations in power supply voltage. Regarding equipment.
［考案の技術的背景］
従来、燃焼量を測定する装置として、例えば炎
電流を利用しているものがある。このような装置
は、バーナから発生される燃焼炎中に検出体を配
置し、バーナと検知体との間に交流電圧を印加す
る。そうすると、バーナと検知体との間に一方向
に多く流れる整流されたような微弱な炎電流が流
れる。そこで、この炎電流を検出して燃焼量を測
定することになる。ところで、バーナと検知体と
の間に印加される交流電圧は、トランスの２次側
に現われる出力電圧をもつて印加し、このトラン
スの１次側には、負荷が接続されるようになつて
いる。[Technical background of the invention] Conventionally, there are devices that use flame current, for example, as devices for measuring the amount of combustion. In such a device, a detection body is placed in a combustion flame generated from a burner, and an alternating current voltage is applied between the burner and the detection body. Then, a weak rectified flame current flows between the burner and the sensing body, with a large amount flowing in one direction. Therefore, the amount of combustion is measured by detecting this flame current. By the way, the AC voltage applied between the burner and the sensing object is applied with an output voltage appearing on the secondary side of the transformer, and a load is connected to the primary side of this transformer. There is.
［背景技術の問題点］
しかしながら、トランスの１次側に負荷が接続
されると電源電圧が低下しこれに伴つてトランス
の２次側の電圧も低下してしまい、炎電流値が減
少してしまう。このため、同一の燃焼量であつて
もこの燃焼量が小さくなつたとか、過燃焼量であ
るとかの判断が出来なくなつてしまう。[Problems with the background art] However, when a load is connected to the primary side of the transformer, the power supply voltage decreases, and the voltage on the secondary side of the transformer also decreases, resulting in a decrease in flame current value. Put it away. Therefore, even if the combustion amount remains the same, it becomes impossible to determine whether the combustion amount has become smaller or whether the combustion amount is over-combusted.
［考案の目的］
本考案は上記実情に基づいてなされたもので、
その目的とするところは、電源電圧が変動しても
正確に炎電流を検出でき高精度の補正機能付き炎
電流検出装置を提供することにある。[Purpose of the invention] This invention was made based on the above circumstances,
The purpose is to provide a flame current detection device with a highly accurate correction function that can accurately detect flame current even when the power supply voltage fluctuates.
［考案の概要］
本考案は、バーナと燃焼炎中に配置される検知
体との間に形成されて炎電流が流れる電気回路と
等価の作用を行なう疑似回路を備え、バーナと検
知体と間に所定電圧を印加したときに流れる炎電
流および疑似回路に電源電圧を印加したときの疑
似電流とを比較して炎電流を補正し、電源電圧が
変動しても炎電流を正確に検出するようにした補
正機能付き炎電流検出装置である。[Summary of the invention] The present invention includes a pseudo circuit that is formed between a burner and a sensing body placed in a combustion flame and has an effect equivalent to an electric circuit through which flame current flows. The flame current is corrected by comparing the flame current that flows when a predetermined voltage is applied to the pseudo circuit with the pseudo current that flows when the power supply voltage is applied to the pseudo circuit, so that the flame current can be detected accurately even when the power supply voltage fluctuates. This is a flame current detection device with a correction function.
［考案の実施例］
以下、本考案の一実施例について図面を参照し
て説明する。[Embodiment of the invention] An embodiment of the invention will be described below with reference to the drawings.
第１図は補正機能付き炎電流検出装置の構成図
である。同図において交流電源１を１次側に接続
したトランス２の２次側の一端には、切換部３の
炎側接点３ａを介して検知棒４が接続されてい
る。この検知棒４は、バーナ５により発生する燃
焼炎中に配置されるものである。そして、バーナ
５はアースされることにより検知棒４とバーナ５
との間にトランス２の２次側出力電圧が印加され
るものとなつている。 FIG. 1 is a configuration diagram of a flame current detection device with a correction function. In the figure, a detection rod 4 is connected to one end of the secondary side of a transformer 2 to which an AC power source 1 is connected to the primary side, via a flame side contact 3a of a switching section 3. This detection rod 4 is placed in the combustion flame generated by the burner 5. By grounding the burner 5, the detection rod 4 and the burner 5 are connected to each other.
The secondary output voltage of the transformer 2 is applied between the two.
さて、切換部３の疑似側接点３ｂには、検知棒
４とバーナ５との間に交流電圧を印加したときに
形成され電気回路と同一の作用をもつた疑似回路
６が接続されている。ところで、この疑似回路６
は次のようにして設定される。つまり、炎電流は
負イオンと正イオンとの移量の差による整流性
と、負イオン濃度および正イオン濃度による抵抗
とに置換できる。従つて、整流性をDf、負イオ
ン濃度による抵抗をRff、正イオン濃度による抵
抗をRfrとすると、その電気的等価回路は第２図
に示すように構成される。そこで、正イオン濃度
による抵抗Rfrは負イオン濃度による抵抗Rffの
数十倍で、かつ逆方向分が与える影響が僅かであ
るので、検知棒４とバーナ５との間に交流電圧を
印加すると炎電流ifが流れる。そこで、実際に疑
似回路６として構成する場合は、第２図に示す電
気的等価回路を第３図に示すような抵抗Ｒ０およ
びダイオードＤ０から成る直列回路となる。な
お、ダイオードＤ０は整流機能のためであり、こ
のダイオードＤ０と抵抗Ｒ０との値は、トランス
２の２次側出力電圧に影響を与えない負荷７を接
続したときに所定電圧をトランス２の１次側に印
加した場合、所定の燃焼量で燃焼炎を得た場合に
おける炎電流ifに対応した値に設定する。 Now, a pseudo circuit 6 which is formed when an alternating current voltage is applied between the detection rod 4 and the burner 5 and has the same effect as an electric circuit is connected to the pseudo side contact 3b of the switching part 3. By the way, this pseudo circuit 6
is set as follows. In other words, the flame current can be replaced by rectification due to the difference in transfer amount between negative ions and positive ions, and resistance due to the negative ion concentration and positive ion concentration. Therefore, if the rectification property is Df, the resistance due to the negative ion concentration is Rff, and the resistance due to the positive ion concentration is Rfr, the electrical equivalent circuit is constructed as shown in FIG. Therefore, the resistance Rfr due to the positive ion concentration is several tens of times the resistance Rff due to the negative ion concentration, and the influence of the reverse direction is small, so when an AC voltage is applied between the detection rod 4 and the burner 5, the flame Current if flows. Therefore, when actually configured as a pseudo circuit 6, the electrical equivalent circuit shown in FIG. 2 becomes a series circuit consisting of a resistor R0 and a diode D0 as shown in FIG. Note that the diode D0 is for a rectification function, and the values of this diode D0 and the resistor R0 are such that when a load 7 that does not affect the secondary output voltage of the transformer 2 is connected, a predetermined voltage is set to 1 of the transformer 2. When applied to the next side, it is set to a value corresponding to the flame current if when a combustion flame is obtained with a predetermined combustion amount.
一方、トランス２の他端には平滑回路として機
能する抵抗Ｒ１とコンデンサＣとの直列回路が接
続され、このコンデンサＣに所定電圧レベルの直
流電源Vssが接続されている。そして、コンデン
サＣに対して抵抗Ｒ２とダイオードＤ１との直列
回路が並列に接続され、炎電流が流れたときに抵
抗Ｒ２における電圧降下Vsをマイクロコンピユ
ータ８へ送出している。また、直流電源Vssには
ツエナダイオードZDが接続されて基準電圧Vrを
作成してマイクロコンピユータ８へ送出するよう
に構成している。なお、Ｒ３は抵抗である。 On the other hand, a series circuit of a resistor R1 and a capacitor C functioning as a smoothing circuit is connected to the other end of the transformer 2, and a DC power supply Vss of a predetermined voltage level is connected to the capacitor C. A series circuit of a resistor R2 and a diode D1 is connected in parallel to the capacitor C, and a voltage drop Vs across the resistor R2 is sent to the microcomputer 8 when a flame current flows. Further, a Zener diode ZD is connected to the DC power supply Vss to create a reference voltage Vr and send it to the microcomputer 8. Note that R3 is a resistance.
前記マイクロコンピユータ８は、第４図に示す
ような炎電流補正フローチヤートのプログラムを
有し、切換部３を炎側端子３ａと疑似側端子３ｂ
とに切換制御を行なつて、このときの炎電流ifと
疑似電流とを交互に入力して比較し、この比較結
果によつて炎電流を補正して実際の炎電流を演算
し求める機能を持つたものである。 The microcomputer 8 has a flame current correction flowchart program as shown in FIG.
The function is to perform switching control between the two, alternately input and compare the flame current if and the pseudo current, correct the flame current based on the comparison results, and calculate the actual flame current. It's something you have.
次に上記の如く構成された装置の動作について
第４図に示す炎電流補正フローチヤートに従つて
説明する。炎電流検出がスタートするとステツプ
ｓ１において切換信号が切換部３に送出されて切
換部３が炎側端子３ａに切換接続される。これに
より、トランス２の２次側出力電圧が検知棒４と
バーナ５との間に印加されて炎電流が流れる。こ
の炎電流はその整流性により直流電源Vssから抵
抗Ｒ２、ダイオードＤ１、抵抗Ｒ１、トランス２
の２次側コイルを介して検知棒４に流れ、さらに
この検知棒４からバーナ５へと流れる。ここで、
抵抗Ｒ２による電圧降下Vsつまり炎電流に比例
した電圧降下がマイクロコンピユータ８に送出さ
れてステツプｓ２においてこの電圧降下Vsをデ
イジタル信号に変換して取り込む。そして、マイ
クロコンピユータ８は基準電圧Vrもデイジタル
信号に変換して取り込み、もつて炎電流により電
圧降下Vsと基準電圧Vrとの差を演算し、例えば
ｎとして記憶する。次にステツプｓ３において切
換信号が切換部３に送出されて切換部３が疑似側
端子３ｂに切換接続される。これにより、トラン
ス２の２次側出力電圧が疑似回路６に印加されて
疑似電流が流れる。この疑似電流は直流電源Vss
から抵抗Ｒ２、ダイオードＤ１、抵抗Ｒ１、トラ
ンス２の２次側コイルを介してダイオードＤ０、
抵抗Ｒ０へと流れる。ここで、抵抗Ｒ２による電
圧降下Vsつまり疑似回路に比例した電圧降下が
マイクロコンピユータ８に送出されてステツプｓ
４においてこの電圧降下をデイジタル信号に変換
して取り込む。そして、マイクロコンピユータ８
は基準電圧Vrもデイジタル信号に変換して取り
込み、もつて疑似電流による電圧降下Vsと基準
電圧Vrとの差を演算し求めて記憶する。次にス
テツプｓ５において炎電流と疑似電流とが比較さ
れて炎電流が大きければステツプｓ６に移つて炎
電流を減少して補正する。なお、炎電流の減少値
は、燃焼量に対する炎電流値が設定されているの
で、この炎電流値に基づいて補正すれば良い。次
に炎電流が小さいとステツプｓ７において判断さ
れればステツプｓ８に移つて炎電流を増加して補
正する。かくして、ステツプｓ９において正確な
炎電流が求めら、次のステツプｓ１０に移つて次
のシーケンスを実行する。 Next, the operation of the apparatus constructed as described above will be explained according to the flame current correction flowchart shown in FIG. When flame current detection starts, a switching signal is sent to the switching section 3 in step s1, and the switching section 3 is switched and connected to the flame side terminal 3a. As a result, the secondary output voltage of the transformer 2 is applied between the detection rod 4 and the burner 5, and a flame current flows. This flame current flows from the DC power supply Vss to the resistor R2, the diode D1, the resistor R1, and the transformer 2 due to its rectifying property.
It flows to the detection rod 4 via the secondary coil of , and further flows from this detection rod 4 to the burner 5. here,
The voltage drop Vs caused by the resistor R2, that is, the voltage drop proportional to the flame current, is sent to the microcomputer 8, and in step s2, this voltage drop Vs is converted into a digital signal and taken in. The microcomputer 8 also converts the reference voltage Vr into a digital signal and takes it in, calculates the difference between the voltage drop Vs and the reference voltage Vr using the flame current, and stores it as n, for example. Next, in step s3, a switching signal is sent to the switching section 3, and the switching section 3 is switched and connected to the pseudo side terminal 3b. As a result, the secondary output voltage of the transformer 2 is applied to the pseudo circuit 6, and a pseudo current flows. This pseudo current is the DC power supply Vss
from resistor R2, diode D1, resistor R1, and diode D0 through the secondary coil of transformer 2.
Flows to resistor R0. Here, the voltage drop Vs caused by the resistor R2, that is, the voltage drop proportional to the pseudo circuit, is sent to the microcomputer 8 and the voltage drop Vs is proportional to the pseudo circuit.
4 converts this voltage drop into a digital signal and captures it. And microcomputer 8
also converts the reference voltage Vr into a digital signal and takes it in, and then calculates and stores the difference between the voltage drop Vs due to the pseudo current and the reference voltage Vr. Next, in step s5, the flame current and the pseudo current are compared, and if the flame current is large, the process moves to step s6, where the flame current is reduced and corrected. Note that since the flame current value for the combustion amount is set, the flame current reduction value may be corrected based on this flame current value. Next, if it is determined in step s7 that the flame current is small, the process moves to step s8 and the flame current is increased to correct it. In this way, an accurate flame current is obtained in step s9, and the process moves to the next step s10 to execute the next sequence.
このように上記一実施例においては、バーナ５
と燃焼炎中に配置される検知棒４との間に形成さ
れて炎電流が流れる電気回路と等価の作用を行な
う疑似回路６を備え、バーナ５と検知体４と間に
交流電圧を印加したときに流れる炎電流および疑
似回路６に交流電圧を印加したときの疑似電流と
を比較して炎電流を補正しする構成としたので、
トランス２の１次側に負荷７が接続されて２次側
出力電圧が変動してもこの変動が疑似電流との比
較によつて判断されて炎電流を所定の２次側出力
電圧に対する値に常に補正できて、燃焼量に対応
した炎電流を求めることができる。従つて、燃焼
量が同一の場合に２次側出力電圧が変動しても２
次側出力電圧か変動しない状態と同様に正確な炎
電流が検知でき、消火および安全しや断等の誤動
作を防止できる。 In this way, in the above embodiment, the burner 5
A pseudo circuit 6 is formed between the burner 5 and the detection rod 4 disposed in the combustion flame, and performs an action equivalent to an electric circuit through which flame current flows, and an alternating current voltage is applied between the burner 5 and the detection body 4. The configuration is such that the flame current is corrected by comparing the flame current that sometimes flows with the pseudo current when an alternating current voltage is applied to the pseudo circuit 6.
Even if the load 7 is connected to the primary side of the transformer 2 and the secondary output voltage fluctuates, this fluctuation is judged by comparing it with the pseudo current, and the flame current is adjusted to a value corresponding to the predetermined secondary output voltage. It can always be corrected and the flame current corresponding to the combustion amount can be determined. Therefore, even if the secondary output voltage changes when the combustion amount is the same, the
Accurate flame current can be detected in the same way as when the output voltage on the next side does not fluctuate, and malfunctions such as extinguishing and safely cutting off the shield can be prevented.
なお、本考案は上記一実施例に限定されるもの
ではなく、その主旨を逸脱しない範囲で変形する
ことができる。例えば、炎電流値の判断を第５図
に示すようなフローチヤートに従つて実行しても
よい。これは、ステツプｓ４の次のステツプｓ１
１において炎電流が疑似電流に対して2μA以上大
きいかを判断し、次のステツプｓ１２において炎
電流が疑似電流に対して1μA以上大きいかを判断
し、さらに続いて炎電流値を判断するようにす
る。そして、補正は2μA以上であればステツプｓ
１３において−2.5μAの減算を実行し、1μA以上
であればステツプｓ１４において−1.5μAの減算
を実行するものとしている。 Note that the present invention is not limited to the above-mentioned embodiment, and can be modified without departing from the spirit thereof. For example, the flame current value may be determined according to a flowchart as shown in FIG. This is the next step s1 after step s4.
In Step 1, it is determined whether the flame current is 2 μA or more larger than the pseudo current, and in the next step s12, it is determined whether the flame current is 1 μA or more larger than the pseudo current, and then the flame current value is determined. do. Then, if the correction is 2 μA or more, step s is applied.
In step s13, a subtraction of -2.5 .mu.A is executed, and if it is 1 .mu.A or more, a subtraction of -1.5 .mu.A is executed in step s14.
［考案の効果］
以上詳記したように本考案によれば、電源電圧
が変動しても正確に炎電流を検出できる高精度の
補正機能付き炎電流検出装置を提供できる。[Effects of the Invention] As detailed above, according to the present invention, it is possible to provide a highly accurate flame current detection device with a correction function that can accurately detect flame current even when the power supply voltage fluctuates.
第１図は本考案に係わる補正機能付き炎電流検
出装置の一実施例を示す構成図、第２図および第
３図は本考案装置における疑似回路の構成を説明
するための図、第４図は本考案装置の炎電流補正
フローチヤート、第５図は本考案装置の変形例を
説明するためのフローチヤートである。
２……トランス、３……切換部、４……検知
棒、５……バーナ、６……疑似回路、７……負
荷、８……マイクロコンピユータ、ZD……ツエ
ナダイオード。
FIG. 1 is a configuration diagram showing an embodiment of the flame current detection device with a correction function according to the present invention, FIGS. 2 and 3 are diagrams for explaining the configuration of a pseudo circuit in the device of the present invention, and FIG. 4 is a flame current correction flowchart of the device of the present invention, and FIG. 5 is a flowchart for explaining a modification of the device of the present invention. 2...Transformer, 3...Switching section, 4...Detection rod, 5...Burner, 6...Pseudo circuit, 7...Load, 8...Microcomputer, ZD...Zena diode.
Claims (1)
に配置される検知体と、前記バーナと前記検知体
との間に所定電圧を印加する電源と、前記バーナ
と前記検知体との間に形成される炎電流が流れる
電気回路と等価の作用を行なう疑似回路と、前記
炎電流および前記疑似回路に前記電源電圧を印加
したときの疑似電流とを比較して前記炎電流を補
正する補正部とを具備し、前記電源電圧が変動し
ても前記炎電流を高精度に検出することを特徴と
する補正機能付き炎電流検出装置。 A burner, a sensing body disposed in a combustion flame generated by the burner, a power source that applies a predetermined voltage between the burner and the sensing body, and a sensor formed between the burner and the sensing body. A pseudo-circuit that performs an action equivalent to an electric circuit through which a flame current flows, and a correction unit that corrects the flame current by comparing the flame current and a pseudo-current when the power supply voltage is applied to the pseudo-circuit. A flame current detection device with a correction function is characterized in that the flame current is detected with high accuracy even if the power supply voltage fluctuates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17359585U JPH0241474Y2 (en) | 1985-11-13 | 1985-11-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17359585U JPH0241474Y2 (en) | 1985-11-13 | 1985-11-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6288152U JPS6288152U (en) | 1987-06-05 |
| JPH0241474Y2 true JPH0241474Y2 (en) | 1990-11-05 |
Family
ID=31111200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17359585U Expired JPH0241474Y2 (en) | 1985-11-13 | 1985-11-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0241474Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008089195A (en) * | 2006-09-29 | 2008-04-17 | Noritz Corp | Flame current detecting device and combustion device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013015232A (en) * | 2011-06-30 | 2013-01-24 | Edwards Kk | Combustion-type exhaust gas treatment apparatus |
-
1985
- 1985-11-13 JP JP17359585U patent/JPH0241474Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008089195A (en) * | 2006-09-29 | 2008-04-17 | Noritz Corp | Flame current detecting device and combustion device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6288152U (en) | 1987-06-05 |
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