JPS584041Y2 - Combustion control device - Google Patents
Combustion control deviceInfo
- Publication number
- JPS584041Y2 JPS584041Y2 JP3245978U JP3245978U JPS584041Y2 JP S584041 Y2 JPS584041 Y2 JP S584041Y2 JP 3245978 U JP3245978 U JP 3245978U JP 3245978 U JP3245978 U JP 3245978U JP S584041 Y2 JPS584041 Y2 JP S584041Y2
- Authority
- JP
- Japan
- Prior art keywords
- relay
- combustion
- normally open
- open contact
- energized
- 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
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- Regulation And Control Of Combustion (AREA)
- Control Of Combustion (AREA)
Description
【考案の詳細な説明】
この考案はボイラ等の燃焼制御を行う燃焼制御装置に関
する。[Detailed Description of the Invention] This invention relates to a combustion control device that controls the combustion of a boiler or the like.
燃焼制御装置には定常燃焼時に失火事故が生じると直ち
に全電源を遮断して燃焼を停止するとともに警報を発す
るタイプのものがあるが、これでは単なる失火でも上記
のような警報動作が行われてしまうという点からかえっ
て不便であるという見解も多く、近年は失火時には直ち
に警報を出さずプリパージ動作、点火動作および定常燃
焼動作の一連の動作を再び行う自動再着火方式が見直さ
れるに至っている。Some types of combustion control devices immediately shut off all power, stop combustion, and issue an alarm when a misfire occurs during steady combustion, but with these devices, the above-mentioned alarm action is not performed even in the event of a simple misfire. Many people believe that it is rather inconvenient due to the fact that it has to be put away, and in recent years the automatic re-ignition method, which does not immediately issue an alarm in the event of a misfire and restarts a series of operations including pre-purge operation, ignition operation, and steady combustion operation, has been reconsidered.
本考案は上記の自動再着火方式の燃焼制御装置において
失火時に不用意に点火装置が動作して爆発事故を起こす
恐れのないように改善することを目的とする。The object of the present invention is to improve the above-mentioned automatic re-ignition type combustion control device so that there is no possibility that the ignition device will operate inadvertently in the event of a misfire and cause an explosion accident.
以下本考案の1実施例について図面を参照しながら説明
する。An embodiment of the present invention will be described below with reference to the drawings.
第1図において、警報器ALには警報用リレーの常開接
点13が接続され、バーナモータBMには並列接続され
た燃焼用リレーの常開接点52と点火用リレーの常開接
点31とが接続されている。In FIG. 1, the normally open contact 13 of the alarm relay is connected to the alarm AL, and the normally open contact 52 of the combustion relay and the normally open contact 31 of the ignition relay, which are connected in parallel, are connected to the burner motor BM. has been done.
パイロット弁開閉器P■には警報用リレーの常閉接点1
1と燃焼用リレーの常開接点51とが直列接続されてお
り、点火器IGは点火用リレーの常開接点32をへて燃
焼用リレーの常開接点51に接続され、メイン弁開閉器
MVは点火用リレーの常閉接点33をへて常開接点51
に接続されている。The pilot valve switch P■ has the normally closed contact 1 of the alarm relay.
1 and the normally open contact 51 of the combustion relay are connected in series, and the igniter IG is connected to the normally open contact 51 of the combustion relay via the normally open contact 32 of the ignition relay, and the main valve switch MV is connected to the normally open contact 51 of the combustion relay. passes through the normally closed contact 33 of the ignition relay to the normally open contact 51
It is connected to the.
これら警報用リレー、燃焼用リレー、点火用リレーは次
に述べる制御回路に組み込まれて動作し、プリパージ動
作時にバーナモータBMのみが動作し、次の点火動作時
にはパイロット弁開閉器PVが動作してパイロット弁が
開くとともに点火器IGが動作し、かつバーナモータB
Mが動作する。These alarm relays, combustion relays, and ignition relays are incorporated into the control circuit described below and operate. During the pre-purge operation, only the burner motor BM operates, and during the next ignition operation, the pilot valve switch PV operates and the pilot When the valve opens, the igniter IG operates, and the burner motor B
M works.
定常燃焼時にはバーナモータBMが動作し、メイン弁開
閉器MVが動作してメイン弁が開かれる。During steady combustion, the burner motor BM operates, the main valve switch MV operates, and the main valve is opened.
警報動作時には警報器ALのみが動作し、他の全ての電
源は遮断される。When the alarm is activated, only the alarm AL is activated and all other power sources are shut off.
制御回路は第1図に示すように炎検出回路96、プリパ
ージタイマ回路97、安全タイマ回路99等からなって
いる。The control circuit consists of a flame detection circuit 96, a prepurge timer circuit 97, a safety timer circuit 99, etc., as shown in FIG.
炎検出回路96は例えば炎の熱に応動する炎検出素子9
5の出力に応じて炎があるときにトランジスタ81をオ
フ、炎がないときにトランジスタ81をオンするもので
ある。The flame detection circuit 96 includes, for example, a flame detection element 9 that responds to the heat of the flame.
According to the output of 5, the transistor 81 is turned off when there is a flame, and the transistor 81 is turned on when there is no flame.
電源投入した最初の状態では炎がないので、トランジス
タ81はオンとなり、炎検出用リレーのりレコイル2に
通電が行われ、その常開接点21がオン、常閉接点22
がオフとなる。When the power is first turned on, there is no flame, so the transistor 81 is turned on, and the flame detection relay recoil 2 is energized, its normally open contact 21 is turned on, and its normally closed contact 22 is turned on.
is turned off.
その結果点゛火用リレーのリレーコイル3に通電され、
その常開接点31.32がオン、常閉接点33がオフと
なる。As a result, the relay coil 3 of the ignition relay is energized,
The normally open contacts 31 and 32 are turned on, and the normally closed contacts 33 are turned off.
その結果バーナモータBMが動作する。As a result, burner motor BM operates.
点火器IGは常開接点51がオフであるため動作しない
。The igniter IG does not operate because the normally open contact 51 is off.
前記常開接点21がオンとなったことによりプリパージ
タイマ回路97が動作開始し、一定時間後にトランジス
タ82をオンする。When the normally open contact 21 is turned on, the prepurge timer circuit 97 starts operating and turns on the transistor 82 after a certain period of time.
するとプリパージ用リレーのリレーコイル4に通電され
、その常開接点41がオンとなり、燃焼用リレーのリレ
ーコイル5に通電される。Then, the relay coil 4 of the pre-purge relay is energized, its normally open contact 41 is turned on, and the relay coil 5 of the combustion relay is energized.
その結果前記常開接点51がオンとなってパイロット弁
開閉器P■が動作し、パイロット弁が開くとともに点火
器IGが動作する。As a result, the normally open contact 51 is turned on, the pilot valve switch P■ is operated, the pilot valve is opened, and the igniter IG is operated.
こうしてプリパージタイマ回路97によって決められる
プリパージ時間の終了後に点火動作に移行していくので
ある。In this way, after the pre-purge time determined by the pre-purge timer circuit 97 ends, the ignition operation starts.
パイロットバーナに点火がなされると炎検出回路96が
働いてトランジスタ81をオフとし、炎検出用リレーの
リレーコイル2への通電を停止する。When the pilot burner is ignited, the flame detection circuit 96 operates to turn off the transistor 81 and stop energizing the relay coil 2 of the flame detection relay.
そのため常開接点21はオフに、常閉接点22はオンに
それぞれ復帰する。Therefore, the normally open contact 21 returns to OFF, and the normally closed contact 22 returns to ON.
その結果点火用リレーおよびプリパージ用リレーのリレ
ーコイル3,4およびプリパージタイマ回路97への通
電が停止するが、燃焼用リレーのリレーコイル5へは自
己保持用の常開接点53をへてオンに復帰した前記常閉
接点22より通電がなされるため、この燃焼用リレーは
動作し続ける。As a result, the energization to the relay coils 3 and 4 of the ignition relay and the pre-purge relay and the pre-purge timer circuit 97 is stopped, but the power is turned on to the relay coil 5 of the combustion relay through the normally open contact 53 for self-holding. Since the normally closed contact 22 which has returned to normal is energized, this combustion relay continues to operate.
点火用リレーのリレーコイル3への通電が停止したこと
によりその常開接点32がオフに、常閉接点33がオン
にそれぞれ復帰し、メイン弁開閉器MVが動作してメイ
ン弁が開き、メインバーナの点火へと移り定常燃焼とな
る。As the energization to the relay coil 3 of the ignition relay is stopped, the normally open contact 32 is turned off and the normally closed contact 33 is returned to on, and the main valve switch MV operates to open the main valve, and the main valve is opened. The burner starts to ignite, resulting in steady combustion.
万一点火動作にもかかわらず炎検出がなされない場合に
は次のようにして警報動作が行われる。In the unlikely event that no flame is detected despite the ignition operation, an alarm operation will be performed as follows.
プリパージタイマ回路97はプリパージ時間の終了後、
前記のようにトランジスタ82をオンさせるか゛、これ
と同時にトランジスタ83をオフさせる。After the prepurge time ends, the prepurge timer circuit 97
Either the transistor 82 is turned on as described above, or the transistor 83 is turned off at the same time.
従ってこのときよりコンテ゛ンサ74に充電が行われる
ことになる。Therefore, from this point on, the capacitor 74 will be charged.
このコンデンサ74と抵抗79とで時定数回路が構成さ
れており、この時、定数回路とスイッチング回路98と
で安全タイマ回路99が構成されている。The capacitor 74 and the resistor 79 constitute a time constant circuit, and at this time, the constant circuit and the switching circuit 98 constitute a safety timer circuit 99.
上記のように点火動作が行われのち一定時間以上経過し
ても炎検出がなされない場合には、コンデンサ74の両
端電圧が上昇してスイッチング回路98をオンさせ、ト
ランジスタ84をオンとする。If a flame is not detected even after a certain period of time has elapsed after the ignition operation is performed as described above, the voltage across the capacitor 74 increases, turning on the switching circuit 98 and turning on the transistor 84.
その結果警報用リレーのセットコイル1Sに通電が行わ
れてその常閉接点11.12がオフとなり、常開接点1
3がオンとなる。As a result, the set coil 1S of the alarm relay is energized, its normally closed contacts 11 and 12 are turned off, and its normally open contacts 1
3 is turned on.
この警報用リレーはこの状態で自己保持され、従って警
報器ALへの通電がなされるばか全ての電源が遮断され
る。This alarm relay is self-maintained in this state, so that all power to the alarm AL is cut off.
こうして警報動作がなされるとともに安全動作が行われ
る。In this way, an alarm operation is performed and a safety operation is performed.
なおこの制御回路でコンテ゛ンサ71は平滑用、コンテ
゛ンサ72は炎検出用、コンデンサ73はその放電電流
をプリパージ用リレーのリレーコイル4に流すことによ
ってこのリレーを駆動するためのものである。In this control circuit, the capacitor 71 is for smoothing, the capacitor 72 is for flame detection, and the capacitor 73 is for driving the pre-purge relay by passing its discharge current to the relay coil 4 of the relay.
抵抗76は電流制限用であり、トランジスタ82が短絡
故障した場合に抵抗76を通じて流れる電流のみではこ
のプリパージ用リレーが駆動されないようにしている。The resistor 76 is for current limiting, and prevents the prepurge relay from being driven by the current flowing through the resistor 76 alone when the transistor 82 is short-circuited.
抵抗75は定電圧ダイオード85の電流制限用であり、
抵抗77はトランジスタ83のベース安定用、抵抗78
はトランジスタ83に流れるコンデンサ74の放電電流
を制限するためのものである。The resistor 75 is for current limiting of the constant voltage diode 85,
Resistor 77 is for stabilizing the base of transistor 83, resistor 78
is for limiting the discharge current of the capacitor 74 flowing to the transistor 83.
ダイオード86〜89はリレーコイルに生じる逆起電力
吸収用、ダイオード90は逆流防止用である。Diodes 86 to 89 are used to absorb back electromotive force generated in the relay coil, and diode 90 is used to prevent backflow.
またプリパージタイマ回路97は警報用リレーのセット
コイル1Sの一端に接続されており、このセットコイル
1Sが断線したときにはタイマ動作を行わず、トランジ
スタ82を決してオンしないようにして危険時に警報動
作がなされない危険性を除去している。Further, the pre-purge timer circuit 97 is connected to one end of the set coil 1S of the alarm relay, and when the set coil 1S is disconnected, the timer operation is not performed and the transistor 82 is never turned on so that the alarm action is not performed in the event of danger. Eliminates the risk of not doing so.
前記のように着火ミスが生じて警報用リレーのセットコ
イル1Sに通電が行われ警報器ALが動作するとともに
他の全ての電源が遮断され、この状態が保持されている
とき電源回路に挿入されたスイゾチ6を操作して接点6
2に接続することにより警報用リレーのリセットコイル
1Rに通電され、上記の状態が解除されることになる。As mentioned above, when an ignition error occurs, the set coil 1S of the alarm relay is energized, the alarm AL is activated, and all other power sources are cut off.While this state is maintained, the alarm relay is inserted into the power circuit. Operate Suizochi 6 to close contact 6.
2, the reset coil 1R of the alarm relay is energized and the above state is released.
そしてその後接点61に接続するようにすれば運転を再
び開始することができる。Then, by connecting the contact point 61 after that, the operation can be restarted.
なおこの警報用リレーはセットコイル1Sとリセットコ
イル1Rとを持つ自己保持型の磁気キープリレーである
。This alarm relay is a self-holding type magnetic keep relay having a set coil 1S and a reset coil 1R.
ところで定常燃焼時に何らかの原因で失火事故が生じる
とトランジスタ81がオンする。By the way, if a misfire accident occurs for some reason during steady combustion, the transistor 81 is turned on.
その結果炎検出用リレーは動作し、その常開接点21が
オン、常閉接点22がオフとなる。As a result, the flame detection relay operates, and its normally open contact 21 is turned on and its normally closed contact 22 is turned off.
この状態をタイムチャートで示すと第2図のようになる
。This state is shown in a time chart as shown in FIG.
すなわち時刻でtlでトランジスタ81がオンすると所
定のル−動作時間を経過して時刻t2になったときまず
常閉接点22がオフとなり、その後トランスファ時間だ
け遅れて時刻t3で常開接点21がオンとなるのである
。That is, when the transistor 81 is turned on at time tl, the normally closed contact 22 is turned off at time t2 after a predetermined operating time has elapsed, and then the normally open contact 21 is turned on at time t3, delayed by the transfer time. It becomes.
従ってリレーコイル5への通電停止が時刻t2で、リレ
ーコイル3への通電開始が時刻t3で直ちに行われるが
、常開接点51は燃焼用リレーの復帰時間だけ遅れて時
刻t4でオフとなり、常開接点32は点火用リレーの動
作時間だけ遅れて時刻t5でオンとなる。Therefore, energization to the relay coil 5 is stopped at time t2, and energization to the relay coil 3 is immediately started at time t3, but the normally open contact 51 is turned off at time t4, delayed by the return time of the combustion relay. The open contact 32 is turned on at time t5, delayed by the operating time of the ignition relay.
ここで燃焼用リレーの復帰時間と点火用リレーの動作時
間とが等しいとしても、時刻t4の方が時刻t5より早
く到来するため常開接点51.32がいずれもオンとな
る時間がなく、点火器IGは動作しない。Even if the recovery time of the combustion relay and the operating time of the ignition relay are equal, time t4 arrives earlier than time t5, so there is no time for both the normally open contacts 51 and 32 to turn on, and the ignition starts. The device IG does not work.
更に時刻t4を時刻t5より早く到来させるために、第
1図に示すように燃焼用リレーのリレーコイル5に逆起
電力吸収用として抵抗80とコンテ゛ンサ70との直列
回路を並列接続することが好ましい。Furthermore, in order to arrive at time t4 earlier than time t5, it is preferable to connect a series circuit of a resistor 80 and a capacitor 70 in parallel to the relay coil 5 of the combustion relay for absorbing back electromotive force, as shown in FIG. .
こうすると他のリレーコイルで接続しているダイオード
の場合よりも復帰時間を短くすることができ、時刻t4
を時刻t5より早めることが一層確実となる。In this way, the recovery time can be made shorter than in the case of diodes connected with other relay coils, and at time t4
It is more reliable to bring the time earlier than time t5.
従って失火時には点火器IGが動作しないため、爆発等
の危険性を回避することができる。Therefore, in the event of a misfire, the igniter IG does not operate, so it is possible to avoid risks such as explosion.
なお従来の燃焼制御装置では点火用リレーの常開接点3
2の代りに炎検出用リレーの他の常開接点を点火器IG
に接続したと同様の構成をとっていた。In addition, in conventional combustion control devices, the normally open contact 3 of the ignition relay
Connect the other normally open contact of the flame detection relay to the igniter IG instead of 2.
It had the same configuration as the one connected to .
そのため第2図の例で言えば時刻t3〜t4までの間点
火器IGが動作し、失火中に蓄えられた生ガスがあるに
もかかわらず点火動作が行われて極めて危険な状態とな
っていた。Therefore, in the example shown in Figure 2, the igniter IG operates from time t3 to time t4, and the ignition operation is performed even though there is raw gas stored during the misfire, creating an extremely dangerous situation. Ta.
本考案によればこの危険性が除去できるのである。According to the present invention, this risk can be eliminated.
また従来では炎検出用リレーは第1図に示す接点21.
22に加えて点火器IGを制御するための常開接点を備
えているため比較的接点容量の大きなリレーを用いる必
要があるが、こうすると微少負荷を遮断する接点21.
22で接触不良が起こることが心配されるし、更に点火
器IGへの通電遮断時のアークで両接点の絶縁が悪化し
、混触の恐れも生じる。Furthermore, in the conventional flame detection relay, the contact point 21 shown in FIG.
In addition to the contact 21.22, it is equipped with a normally open contact for controlling the igniter IG, so it is necessary to use a relay with a relatively large contact capacity.
There is concern that a contact failure may occur at the igniter IG, and furthermore, the insulation between both contacts may deteriorate due to arcing when power is cut off to the igniter IG, resulting in a risk of cross-contact.
本考案では炎検出用リレーと点火用リレーとを別のリレ
ーで構成しているため、上記のような不都合はない。In the present invention, the flame detection relay and the ignition relay are configured as separate relays, so the above-mentioned disadvantages do not occur.
この考案によれば、炎検出用リレーの常開接点によって
点火用リレーへの通電が、常閉接点によって燃焼用リレ
ーへの通電が制御されているので、再着火時においても
点火用リレーと燃焼用リレーとが同時にON動作を行な
わず、不用意に燃焼動作を行なわない。According to this invention, the normally open contact of the flame detection relay controls the energization of the ignition relay, and the normally closed contact controls the energization of the combustion relay, so even when re-igniting, the ignition relay and the combustion Do not turn on the relay at the same time as the relay, and do not perform the combustion operation inadvertently.
また点火器への通電の前にバーナーモータが駆動されて
燃焼室内の残留燃料を排気し、プリパージ動作後点火器
への通電とともに燃料弁開閉器への通電が行なわれて点
火が行なわれるので、定常燃焼中の失火事故時の再点火
を極めて安定に行なうことができる。Also, before the igniter is energized, the burner motor is driven to exhaust residual fuel in the combustion chamber, and after the pre-purge operation, the igniter is energized and the fuel valve switch is energized to ignite. Re-ignition can be performed extremely stably in the event of a misfire accident during steady combustion.
第1図は本考案の1実施例を示す回路図、第2図は第1
図の動作を説明するためのタイムチャートである。
AL・・・・・・警報器、BM・・・・・・バーナモー
タ、■G・・・・・・点火器、PV・・・・・・パイロ
ット弁開閉器、MV・・・・・・メイン弁開閉器、95
・・・・・・炎検出素子、96・・・・・・炎検出回路
、97・・・・・・プリパージタイマ回路、98・・・
・・・スイッチング回路、99・・・・・・安全タイマ
回路。Fig. 1 is a circuit diagram showing one embodiment of the present invention, and Fig. 2 is a circuit diagram showing one embodiment of the present invention.
3 is a time chart for explaining the operation shown in the figure. AL...Alarm, BM...Burner motor, ■G...Igniter, PV...Pilot valve switch, MV...Main Valve switch, 95
...Flame detection element, 96...Flame detection circuit, 97...Prepurge timer circuit, 98...
...Switching circuit, 99...Safety timer circuit.
Claims (1)
炎検出を行なう炎検出手段と、この炎検出手段が炎無し
検出出力を導出したとき駆動される炎検出用リレーと、
この炎検出用リレーの常開接点を通じて通電される点火
制御用リレーと、前記炎検出用リレーの常開接点を通じ
て通電されタイマ動作を開始するプリパージタイマと、
点火動作時プリパージタイマの出力に基づいて動作しか
つ定常燃焼時に前記炎検出用リレーの常閉接点を通じて
通電される燃焼用リレーと、この燃焼用リレーの常開接
点と前記炎検出用リレーの常開接点とが閉状態のとき通
電される点火器と、前記点火制御用リレーの常開接点を
通じて通電されるバーナーモータと、前記燃焼用リレー
の常開接点により通電される燃料弁開閉器とを備えた燃
焼制御装置。In a combustion control device that performs ignition operation again in the event of a misfire,
a flame detection means for detecting a flame; a flame detection relay that is driven when the flame detection means derives a flameless detection output;
an ignition control relay that is energized through the normally open contact of the flame detection relay; a prepurge timer that is energized through the normally open contact of the flame detection relay to start timer operation;
A combustion relay that operates based on the output of the prepurge timer during ignition operation and is energized through the normally closed contact of the flame detection relay during steady combustion, and the normally open contact of the combustion relay and the flame detection relay. an igniter that is energized when the normally open contact is in a closed state; a burner motor that is energized through the normally open contact of the ignition control relay; and a fuel valve switch that is energized by the normally open contact of the combustion relay. Combustion control device with
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3245978U JPS584041Y2 (en) | 1978-03-13 | 1978-03-13 | Combustion control device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3245978U JPS584041Y2 (en) | 1978-03-13 | 1978-03-13 | Combustion control device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54135735U JPS54135735U (en) | 1979-09-20 |
JPS584041Y2 true JPS584041Y2 (en) | 1983-01-24 |
Family
ID=28885995
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3245978U Expired JPS584041Y2 (en) | 1978-03-13 | 1978-03-13 | Combustion control device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS584041Y2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5620928A (en) * | 1979-07-30 | 1981-02-27 | Matsushita Electric Ind Co Ltd | Safety system for combustion apparatus |
JPS62728A (en) * | 1985-06-26 | 1987-01-06 | Rinnai Corp | Failsafe for burner |
-
1978
- 1978-03-13 JP JP3245978U patent/JPS584041Y2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS54135735U (en) | 1979-09-20 |
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