JPS62405B2 - - Google Patents

Info

Publication number
JPS62405B2
JPS62405B2 JP1372678A JP1372678A JPS62405B2 JP S62405 B2 JPS62405 B2 JP S62405B2 JP 1372678 A JP1372678 A JP 1372678A JP 1372678 A JP1372678 A JP 1372678A JP S62405 B2 JPS62405 B2 JP S62405B2
Authority
JP
Japan
Prior art keywords
voltage
combustion
voltage comparator
output
oscillator
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
Application number
JP1372678A
Other languages
Japanese (ja)
Other versions
JPS54106933A (en
Inventor
Yoshuki Adachi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP1372678A priority Critical patent/JPS54106933A/en
Publication of JPS54106933A publication Critical patent/JPS54106933A/en
Publication of JPS62405B2 publication Critical patent/JPS62405B2/ja
Granted legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/02Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/10Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • F23N5/102Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples 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】 本発明は燃焼安全装置に係るもので、燃焼炎を
検知する燃焼検知素子と、この燃焼検知素子の出
力電圧を入力とする電圧比較器とこの電圧比較
器に燃焼検知素子の出力電圧を打ち消す方向に
発振信号を重畳させる電圧比較器などで構成さ
れた発振器と、前記燃焼検知素子の入力により前
記発振器の発振周波数で駆動される前記電圧比較
器の出力信号で駆動される燃料弁を制御する燃
料弁駆動部を備えると共に前記電圧比較器の発
振出力信号を入力とする遅延回路を備え、その遅
延回路の出力を入力とする電圧比較器などで構
成された遅延タイマ回路の出力を前記電圧比較器
の基準電圧端子に接続し、その基準電圧(前記
燃焼検知素子の出力電圧の検知レベル)を、前記
燃焼検知素子による着火検出後に、着火以前の基
準電圧から前記燃焼検知素子の定常出力電圧に近
い基準電圧となるようにステツプ的に変化させる
ように構成することにより、燃焼炎の着火検出と
失火検出の高速化を計るとともに安全性、フエー
ルセーフ性、操作性の向上を計ることにある。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion safety device, which includes a combustion detection element that detects combustion flame, a voltage comparator that receives the output voltage of this combustion detection element, and a combustion detection device that detects combustion. It is driven by an oscillator composed of a voltage comparator or the like that superimposes an oscillation signal in a direction that cancels the output voltage of the element, and an output signal of the voltage comparator that is driven at the oscillation frequency of the oscillator by the input of the combustion detection element. A delay timer circuit comprising a fuel valve drive unit for controlling a fuel valve, a delay circuit receiving the oscillation output signal of the voltage comparator as input, and a voltage comparator etc. receiving the output of the delay circuit as input. The output of the is connected to the reference voltage terminal of the voltage comparator, and after the combustion detection element detects ignition, the reference voltage (detection level of the output voltage of the combustion detection element) is changed from the reference voltage before ignition to the combustion detection By configuring the device so that the reference voltage is changed in steps so that the reference voltage is close to the steady output voltage of the element, it is possible to speed up the detection of combustion flame ignition and misfire, and improve safety, fail-safe performance, and operability. The purpose is to measure the

従来、燃焼炎検出素子に熱電対を用いたものと
して湯沸器、風呂釜、ストーブなどに使用されて
いる押し回し安全弁方式がある。この方式は、押
ボタン、つまみ等の押圧で弁が開き、燃料に点火
させると共に着火によつて生じる燃焼炎で加熱さ
れる熱電対で電磁石を動作させ、前記電磁石と係
動するように構成された弁を開位置に保持吸着さ
せる構造である。
Conventionally, there is a push-and-turn safety valve system that uses a thermocouple as a combustion flame detection element and is used in water heaters, bathtubs, stoves, and the like. In this method, a valve is opened by pressing a push button, knob, etc., and the fuel is ignited, and an electromagnet is operated by a thermocouple that is heated by the combustion flame generated by the ignition, and is configured to engage with the electromagnet. This structure holds the valve in the open position and attracts it.

また、他の方式として、熱電対起電力で、直接
電磁リレーを動作させ、その接点で、燃料弁点火
器、タイマ等の燃焼制御部品を制御するものもあ
る。これらの安全装置は、いずれも熱電対で燃料
弁等の負荷を直接駆動する方式の為、太い素線径
の材料で熱電対を構成しないと、弁駆動電流が得
られない。従つて、燃焼検知素子の熱容量、すな
わち熱時定数が大きくなる為応答性が問題とな
り、燃料に着火しても熱電対が十分加熱されるま
で、安全弁を吸着保持できず、操作性に問題があ
ると共に、着火応答時間失火応答時間が長いとい
う問題があつた。
Another method is to directly operate an electromagnetic relay using the electromotive force of the thermocouple, and use its contacts to control combustion control parts such as a fuel valve igniter and a timer. Since all of these safety devices use a thermocouple to directly drive a load such as a fuel valve, the valve drive current cannot be obtained unless the thermocouple is made of a material with a large wire diameter. Therefore, the heat capacity, or thermal time constant, of the combustion detection element becomes large, which poses a problem in responsiveness, and even if the fuel ignites, the safety valve cannot be held by suction until the thermocouple is sufficiently heated, causing problems in operability. In addition, there was a problem that the ignition response time and the misfire response time were long.

本発明は上記従来の問題点を解消するものであ
る。
The present invention solves the above-mentioned conventional problems.

以下、本発明の実施例を図面に基づき説明す
る。
Embodiments of the present invention will be described below based on the drawings.

1は電源、2は運転スイツチ、3は電源回路、
4は燃焼炎を検知する燃焼検知素子6の出力電圧
を入力とする電圧比較器5よりなる燃焼検出回
路、7は電圧比較器8を有する発振器、9は電
圧比較器5の交流駆動出力信号を入力とする遅
延回路、10は遅延回路9を入力とする電圧比較
器11を有する遅延タイマ回路、12は燃料弁
駆動部、13は燃料弁である。
1 is the power supply, 2 is the operation switch, 3 is the power supply circuit,
4 is a combustion detection circuit consisting of a voltage comparator 5 which inputs the output voltage of a combustion detection element 6 for detecting a combustion flame; 7 is an oscillator having a voltage comparator 8; 9 is an AC drive output signal of the voltage comparator 5; 10 is a delay timer circuit having a voltage comparator 11 that receives the delay circuit 9 as an input; 12 is a fuel valve drive unit; and 13 is a fuel valve.

運転スイツチ2はガスコツクと連動して作動す
るもので、別にコツク操作により種火に何らかの
方法で点火できるものとし、燃料弁本体も押圧保
持できる構成とする。
The operation switch 2 is operated in conjunction with a gas cock, and the pilot flame can be ignited in some way by separately operating the cock, and the fuel valve body is also configured to be able to be held under pressure.

14は電源回路3の変成器で、低電圧端子14
a,14bを有する。15は全波ブリツジ整流用
ダイオード、16は平滑用コンデンサ、17は抵
抗、18は定電圧ダイオードである。電源回路3
は上記部品で構成され、出力端子A,B,Cを有
する。
14 is a transformer of the power supply circuit 3, and the low voltage terminal 14
a, 14b. 15 is a full-wave bridge rectifier diode, 16 is a smoothing capacitor, 17 is a resistor, and 18 is a constant voltage diode. Power circuit 3
is composed of the above components and has output terminals A, B, and C.

5は電圧比較器で、電源端子5a,5b、入
力端子5c,5d、出力端子5eを持つ。
A voltage comparator 5 has power terminals 5a, 5b, input terminals 5c, 5d, and an output terminal 5e.

8は電圧比較器で、電源端子8a,8b、入
力端子8c,8d、出力端子8eを持つ。
A voltage comparator 8 has power terminals 8a, 8b, input terminals 8c, 8d, and an output terminal 8e.

19は抵抗、20はコンデンサ、21と22は
抵抗、23は抵抗、24はダイオード、25は抵
抗、26はダイオード、27と28は抵抗であ
る。上記部品で電圧比較器8を有する発振器7
を構成する。
19 is a resistor, 20 is a capacitor, 21 and 22 are resistors, 23 is a resistor, 24 is a diode, 25 is a resistor, 26 is a diode, and 27 and 28 are resistors. Oscillator 7 having voltage comparator 8 with the above components
Configure.

29はトランジスタで発振器7の発振周波数で
駆動される。30は抵抗、31は抵抗で熱電対等
の燃焼検知素子6と直列接続され、5の電圧比較
器の入力に接続されている。
A transistor 29 is driven at the oscillation frequency of the oscillator 7. A resistor 30 and a resistor 31 are connected in series with the combustion detection element 6 such as a thermocouple, and are connected to the input of the voltage comparator 5.

32,33,34,35,36は抵抗で電圧比
較器5の入力端子5a,5bに接続して、燃焼
検出回路4を構成している。
32, 33, 34, 35, and 36 are resistors connected to the input terminals 5a and 5b of the voltage comparator 5 to form the combustion detection circuit 4.

37はダイオード、38は抵抗、39はタイマ
用コンデンサ、40は抵抗であり、前記電圧比較
器5の出力端子5eにダイオード37を接続し
てなる電圧比較器5の交流駆動出力信号を入力
とする遅延回路9を構成する。
37 is a diode, 38 is a resistor, 39 is a timer capacitor, and 40 is a resistor, which inputs the AC drive output signal of the voltage comparator 5 formed by connecting the diode 37 to the output terminal 5e of the voltage comparator 5. A delay circuit 9 is configured.

11は電圧比較器で電源端子11a,11
b、入力端子11c,11d、出力端子11eを
持つ。
11 is a voltage comparator and power terminals 11a, 11
b, has input terminals 11c and 11d, and an output terminal 11e.

遅延回路9を入力として電圧比較器11に接
続している。
The delay circuit 9 is connected to the voltage comparator 11 as an input.

41,42,43,44,45は抵抗、46は
ダイオードで、上記部品で遅延タイマ回路10を
構成する。
41, 42, 43, 44, and 45 are resistors, and 46 is a diode, and these components constitute the delay timer circuit 10.

ダイオード46は電圧比較器5の入力端子5
dに接続されている。
The diode 46 is connected to the input terminal 5 of the voltage comparator 5.
connected to d.

47と48は抵抗、49はダイオード、50,
51,52は抵抗、53と54はトランジスタ、
55と56は抵抗、57は結合コンデンサで電力
増幅回路を構成し、変成器58に接続されてい
る。
47 and 48 are resistors, 49 is a diode, 50,
51 and 52 are resistors, 53 and 54 are transistors,
Resistors 55 and 56 and a coupling capacitor 57 constitute a power amplifier circuit, which is connected to a transformer 58.

59と60は整流用ダイオード、61は平滑用
コンデンサであり、燃料弁駆動部12は上記部品
で構成され、燃料弁13を構成する電磁石62の
巻線63への出力端子DとFを有する。
59 and 60 are rectifying diodes, 61 is a smoothing capacitor, and the fuel valve driving section 12 is composed of the above components, and has output terminals D and F to the winding 63 of the electromagnet 62 that constitutes the fuel valve 13.

次に動作を説明する。 Next, the operation will be explained.

ガスコツクを操作することにより、運転スイツ
チ2がオンすると共に、種火への点火が圧電点火
または点火器等の放電により点火される。
By operating the gas stove, the operation switch 2 is turned on, and the pilot flame is ignited by piezoelectric ignition or discharge from an igniter.

電流は運転スイツチ2を通り、電源回路3に加
わり、変成器14で低電圧となり、全波ブリツジ
ダイオード15で全波整流され、平滑用コンデン
サ16で平滑され、定電圧ダイオード18で定電
圧化された直流電圧が出力端子A,Bに得られる
と共に、C端子にも平滑された電圧が得られ、こ
れらが、燃焼検出回路4、発振器7、遅延タイマ
回路10及び燃料弁駆動部12の電源となる。
The current passes through the operation switch 2, is applied to the power supply circuit 3, becomes a low voltage by the transformer 14, is full-wave rectified by the full-wave bridge diode 15, is smoothed by the smoothing capacitor 16, and is made constant by the voltage regulator diode 18. A smoothed DC voltage is obtained at the output terminals A and B, and a smoothed voltage is also obtained at the C terminal. becomes.

発振器7は電圧比較器8の入力端子8cに抵
抗21,22が接続されており、抵抗21の抵抗
値をR21、抵抗22の抵抗値をR22とすると、
22/R21+R22×(A−B間電圧)で設定され
た基準電 圧Vs5で設定されており、もう一方の入力端子8
dに抵抗19とコンデンサ20が接続されてお
り、抵抗19を通してコンデンサ20に充電され
て、8dの電位が8cの基準電圧より高くなる
と、出力端子8eはL(オン)となる。なお電圧
比較器8の基本動作を参考に説明すると下記の
通りとなる。
The oscillator 7 has resistors 21 and 22 connected to the input terminal 8c of the voltage comparator 8, and if the resistance value of the resistor 21 is R 21 and the resistance value of the resistor 22 is R 22 , then
It is set at the reference voltage V s5 set by R 22 /R 21 +R 22 × (voltage between A and B), and the other input terminal 8
A resistor 19 and a capacitor 20 are connected to d, and when the capacitor 20 is charged through the resistor 19 and the potential of 8d becomes higher than the reference voltage of 8c, the output terminal 8e becomes L (on). The basic operation of the voltage comparator 8 will be explained as follows.

入力端子8c,8dの電圧をV8c,V8dとする
と、 (イ) V8d<V8cのとき、出力端子8eはH(オ
フ) (ロ) V8d>V8cのとき、出力端子8eはL(オ
ン) 8eがL(オン)となると、8cの基準電圧が抵
抗23の抵抗値をR23とすると、 (R22とR23の並列抵抗)/(R22とR23の並
列抵抗)+R21 ×(A−B間電圧) すなわち、 で設定された基準電圧VS6まで電位が下がる。
Assuming that the voltages at input terminals 8c and 8d are V 8c and V 8d , (a) When V 8d < V 8c , output terminal 8e is H (off) (b) When V 8d > V 8c , output terminal 8e is L (on) When 8e becomes L (on), if the reference voltage of 8c and the resistance value of resistor 23 are R 23 , (parallel resistance of R 22 and R 23 ) / (parallel resistance of R 22 and R 23 ) +R 21 × (voltage between A and B), that is, The potential drops to the reference voltage V S6 set in .

すると、コンデンサ20の電荷が抵抗25を通
して放電される。放電により入力端子8dの電位
が入力端子8cの電位より下がると、出力端子8
eはH(オフ)となる。この状態を第5図に示
す。
Then, the charge in the capacitor 20 is discharged through the resistor 25. When the potential of the input terminal 8d becomes lower than the potential of the input terminal 8c due to discharge, the output terminal 8
e becomes H (off). This state is shown in FIG.

このように、基準電圧VS5とVS6の設定と、コ
ンデンサ20と抵抗19の充電時定数C20×R19
得られる時間T1とコンデンサ20と抵抗25の
放電時定数C20×R25で得られる時間T2で出力端
子8eがH(オフ)、L(オン)を繰返し発振
し、トランジスタ29が電圧比較器8のH(オ
フ)時にオフ、L(オン)時にオンしてオンオフ
する発振器7が得られる。
In this way, the time T 1 obtained by setting the reference voltages V S5 and V S6 , the charging time constant C 20 × R 19 of the capacitor 20 and the resistor 19, and the discharging time constant C 20 × R 25 of the capacitor 20 and the resistor 25 During the time T 2 obtained by , the output terminal 8e repeatedly oscillates H (off) and L (on), and the transistor 29 turns off when the voltage comparator 8 is H (off) and turns on and off when it is L (on). An oscillator 7 is obtained.

ここでT1=T2となるようにC20×R19とC20×
R25の時定数及び、抵抗値R21,R22,R23,R25
各々設定することにより、矩形波のduty1:1の
発振周波数で動作する発振器7を得ることができ
る。
Here, C 20 × R 19 and C 20 × so that T 1 = T 2
By setting the time constant of R 25 and the resistance values R 21 , R 22 , R 23 , and R 25 , it is possible to obtain the oscillator 7 that operates at a rectangular wave duty 1:1 oscillation frequency.

続いて燃焼検出前の燃焼検出回路4の動作を第
6図を利用して説明する。
Next, the operation of the combustion detection circuit 4 before combustion detection will be explained using FIG. 6.

電圧比較器5の入力端子5dは抵抗32と3
3で設定された基準電圧VS1=R33/R32+R33
×(A− B間電圧VAB)に設定されており、抵抗35と3
6及び34でその基準電圧VS1に対する電圧比較
器5の部品バラツキによる入力オフセツト調整
を行ない、入力端子5cに接続されている。
The input terminal 5d of the voltage comparator 5 is connected to the resistors 32 and 3.
Reference voltage V S1 set in 3 = R 33 /R 32 +R 33
× (A-B voltage V AB ), and resistors 35 and 3
6 and 34 adjust the input offset due to component variations of the voltage comparator 5 with respect to the reference voltage V S1 , and are connected to the input terminal 5c.

入力端子5dの基準電圧VS1に対して、入力端
子5cの電位は、燃焼検知素子6の起電力を受け
ない時には、抵抗30と31の抵抗値R30とR31
設定された電圧e2=R31/R30+R31×(R32
両端電圧す なわちVAB−VS1)が電圧比較器の入力端子5
cと5d間に発振器7の発振周波数でオン・オフ
するトランジスタ29により駆動されるため、基
準電圧VS1に発振信号e2が重畳されたものとな
る。
With respect to the reference voltage V S1 of the input terminal 5d, the potential of the input terminal 5c is the voltage e 2 set by the resistance values R 30 and R 31 of the resistors 30 and 31 when not receiving the electromotive force of the combustion detection element 6. =R 31 /R 30 +R 31 × (voltage across R 32, that is, V AB -V S1 ) is the input terminal 5 of the voltage comparator
Since it is driven by a transistor 29 that is turned on and off at the oscillation frequency of the oscillator 7 between c and 5d, the oscillation signal e 2 is superimposed on the reference voltage V S1 .

ところが、入力端子5cの電位が入力端子5d
の電位より高いため、出力端子5eはL(オン)
となり、トランジスタ53がオンして、結合コン
デンサ57へ一時的に充電電流が流れ変成器58
に通電されるがすぐに流れなくなり、変成器58
には交流電流が流れないため燃料弁13の巻線6
3には通電されない。
However, the potential of the input terminal 5c is lower than the potential of the input terminal 5d.
Since the potential is higher than that of , the output terminal 5e is L (on).
As a result, transistor 53 turns on, and a charging current temporarily flows to coupling capacitor 57 and transformer 58.
The current is applied to the transformer 58, but it soon stops flowing and the transformer 58
Because no alternating current flows through the winding 6 of the fuel valve 13
3 is not energized.

第7図は燃焼検出後を示し、燃焼炎により加熱
され、燃焼検知素子6に熱起電力が発生し、入力
端子5cに入力電圧e1が印加されると、入力端子
5cの電位が入力端子5dの電位VS1より下がる
ため、出力端子5eがH(オフ)となる。ところ
が入力端子5cと5d間に発振器7の発振信号が
重畳されているので、抵抗31の両端電圧e2によ
り出力端子5eがL(オン)、H(オフ)を繰返
し、発振周波数と連動して動作する。
FIG. 7 shows the state after combustion is detected. When the combustion detection element 6 is heated by the combustion flame and a thermoelectromotive force is generated, and the input voltage e 1 is applied to the input terminal 5c, the potential of the input terminal 5c changes to the input terminal. Since the potential is lower than the potential V S1 of 5d, the output terminal 5e becomes H (off). However, since the oscillation signal of the oscillator 7 is superimposed between the input terminals 5c and 5d, the output terminal 5e repeats L (on) and H (off) due to the voltage e2 across the resistor 31, and changes in conjunction with the oscillation frequency. Operate.

出力端子5eがL(オン)時にトランジスタ5
3がオンし、出力端子5eがH(オフ)時にトラ
ンジスタ54がオンし、トランジスタ53と54
が交互にオン・オフし、結合コンデンサ57を通
して変成器58に交流電流が流れる。変成器58
の二次側で全波整流、平滑され、端子D,Eに直
流電源が得られ、燃料弁13の巻線63へ通電さ
れる。この通電される時間は第2図に示すt1とな
る。
When the output terminal 5e is L (on), the transistor 5
3 is turned on, and when the output terminal 5e is H (off), the transistor 54 is turned on, and the transistors 53 and 54 are turned on.
is alternately turned on and off, and an alternating current flows to the transformer 58 through the coupling capacitor 57. transformer 58
Full-wave rectification and smoothing are performed on the secondary side of the DC power supply, and DC power is obtained at terminals D and E, and the winding 63 of the fuel valve 13 is energized. The time during which this current is applied is t1 shown in FIG.

巻線63へ通電されることにより、コツク操作
で押圧された燃料弁13の電磁石62が吸着保持
される。そこで、コツク操作でメーンバーナへの
通路を開くことにより、メーンバーナへ着火され
る。
By energizing the winding 63, the electromagnet 62 of the fuel valve 13, which is pressed by the push operation, is attracted and held. Then, by opening the passage to the main burner with a quick operation, the main burner is ignited.

一方、電圧比較器5の出力端子5eがH(オ
フ)の時、ダイオード37を通して、遅延回路9
に入力される。タイマ用コンデンサ39の電圧は
抵抗38と40で分割された電圧でC39とR40の時
定数によりVC1=R40/R38+R40×(5eのH
(オフ) 時電圧)×(1−e−R38+R40/C3938
40t)で上昇する。
On the other hand, when the output terminal 5e of the voltage comparator 5 is H (off), the delay circuit 9
is input. The voltage of the timer capacitor 39 is the voltage divided by the resistors 38 and 40, and the time constant of C 39 and R 40 is V C1 = R 40 /R 38 + R 40 × (H of 5e).
(off) voltage) x (1-e-R 38 +R 40 /C 39 R 38 R
40 t).

抵抗41と42で設定された基準電圧 が電圧比較器11の入力端子11dに接続され
ており、入力端子11cへの入力電圧VC39がVS
よりt2時間を経て高くなると、出力端子11e
はL(オン)となる。従つて、燃焼していない時
は出力端子5eがL(オン)のため、遅延回路9
に入力されないので、入力端子11cの電圧は入
力端子11dより低いため、出力端子11eはH
(オフ)である。この状態を第3図に示す。
Reference voltage set by resistors 41 and 42 is connected to the input terminal 11d of the voltage comparator 11, and the input voltage V C39 to the input terminal 11c is V S
When t becomes higher than 3 after 2 hours, the output terminal 11e
becomes L (on). Therefore, when there is no combustion, the output terminal 5e is L (on), so the delay circuit 9
Since the voltage of the input terminal 11c is lower than that of the input terminal 11d, the output terminal 11e becomes H.
(off). This state is shown in FIG.

種火に着火してt2時間後に出力端子11eがL
(オン)すると、電圧比較器5の入力端子5d
の基準電圧VS1=R33/R32+R33×VABは抵抗
33と並 列に抵抗45が挿入されたことになるので、VS1
は、 で示されるVS1より低い電位となる。
Two hours after igniting the pilot flame, the output terminal 11e becomes L.
(ON), the input terminal 5d of the voltage comparator 5
The reference voltage V S1 = R 33 /R 32 + R 33 ×V AB means that a resistor 45 is inserted in parallel with the resistor 33, so V S1
teeth, The potential is lower than V S1 shown by .

すると、第2図に示すように、着火検出時のV
S1に比べ、着火後、出力端子11eがオンするこ
とにより、入力端子5dがVS2になるため、燃焼
検出素子6の出力電圧に対して、定常出力電圧に
近い電圧が基準電圧となり、入力端子5dに設定
されることになり、たとえば、燃焼炎が失火した
場合に燃焼検出素子6の出力電圧の降下時、入力
端子5cの入力電圧が、高い時に、出力端子5e
がL(オン)となり、発振器7の発振周波数で係
動しなくなり、t3時間で燃料弁駆動部12が動作
を停止し、燃料弁13の巻線63への通電が断た
れ、ガス遮断される。
Then, as shown in Fig. 2, V at the time of ignition detection
Compared to S1 , when the output terminal 11e turns on after ignition, the input terminal 5d becomes V S2 , so a voltage close to the steady output voltage becomes the reference voltage with respect to the output voltage of the combustion detection element 6, and the input terminal For example, when the output voltage of the combustion detection element 6 drops when the combustion flame misfires, and when the input voltage of the input terminal 5c is high, the output terminal 5e is set to 5d.
becomes L (on) and is no longer engaged at the oscillation frequency of the oscillator 7, and the fuel valve drive unit 12 stops operating at t3 hours, the power to the winding 63 of the fuel valve 13 is cut off, and the gas is cut off. Ru.

従つて、入力端子5dの基準電圧がVS2になる
ことにより失火検出レベルをずらして応答を早く
しようとするものである。
Therefore, when the reference voltage of the input terminal 5d becomes V S2 , the misfire detection level is shifted to speed up the response.

また、出力端子11eの出力は、出力端子5e
の出力がL(オン)になつて燃料弁13が遮断さ
れると、遅延回路9へ入力されないので、VC39
は抵抗40を通して放電してvC2=VC39e
t/C3940で降下する。ところが、入力端子11
dの 基準電圧は、 とVS3より下つているため、vC2がVS4より下つ
て出力端子11eがH(オフ)するまでt4時間だ
け入力端子5dの基準電圧VS2を維持し、熱起電
力の残留電圧で電圧比較器5が再動作しないよ
うに設定されている。
Furthermore, the output of the output terminal 11e is the output of the output terminal 5e.
When the output of V C39 becomes L (ON) and the fuel valve 13 is shut off, it is not input to the delay circuit 9.
is discharged through resistor 40 and v C2 = V C39e
Descend at t/C 39 R 40 . However, input terminal 11
The reference voltage of d is Therefore, the reference voltage V S2 of the input terminal 5d is maintained for 4 hours until v C2 falls below V S4 and the output terminal 11e turns H (off), and the residual voltage of the thermoelectromotive force The voltage comparator 5 is set not to operate again.

従つて、本発明では、失火検出レベルにおいて
従来と比べ高くしてあるので、失火応答時間が早
くできるものである。すなわち、従来は第2図に
おいて時間t5、本発明は時間t3と早くできる。な
お、第2図において、100は着火検出レベル、
101は失火検出レベル、102は従来の失火検
出レベル、103は燃焼検知素子6の熱起電力波
形、5cは入力端子5cの電圧波形、5dは入力
端子5dの電圧波形であり、上述レベルVS1とV
S2とからなる。第3図において、11cは入力端
子11cの電圧波形であり、vC1とvC2とからな
る。11dは入力端子11dの電圧波形であり、
上述レベルVS3とVS4とからなる。11eは出力
端子11eの電圧波形である。
Therefore, in the present invention, since the misfire detection level is set higher than that of the prior art, the misfire response time can be made faster. That is, in the conventional case, the time t 5 in FIG. 2 can be made as early as time t 3 in the present invention. In addition, in FIG. 2, 100 is the ignition detection level;
101 is a misfire detection level, 102 is a conventional misfire detection level, 103 is a thermoelectromotive force waveform of the combustion detection element 6, 5c is a voltage waveform of the input terminal 5c, 5d is a voltage waveform of the input terminal 5d, and the above-mentioned level V S1 and V
Consists of S2 . In FIG. 3, 11c is the voltage waveform of the input terminal 11c, which consists of v C1 and v C2 . 11d is the voltage waveform of the input terminal 11d,
It consists of the above-mentioned levels V S3 and V S4 . 11e is the voltage waveform of the output terminal 11e.

また、前記燃料駆動部12において、結合コン
デンサ57と変成器58の共振で得られる初期振
動周波数と前記発振器7の発振周波数を合致させ
ることにより、効率のよい正弦波交流が変成器5
8に得られる。
In addition, in the fuel drive unit 12, by matching the initial vibration frequency obtained by resonance between the coupling capacitor 57 and the transformer 58 and the oscillation frequency of the oscillator 7, an efficient sine wave alternating current is transmitted to the transformer 5.
Obtained at 8.

また、燃料弁駆動部12において、第4図に示
すように、電圧比較器が発振周波数で係動する
出力端子5eがH(オフ)の時、トランジスタ5
4を通して結合コンデンサ57を介して充電し、
L(オン)の時にトランジスタ53を通して結合
コンデンサ57の電荷を放電するようにした電力
増幅回路を構成することにより、部品点数も少な
く、且つ、トランジスタ53と54のオンオフを
確実にさせることができるものである。65,6
6,67は抵抗である。
In addition, in the fuel valve drive unit 12, as shown in FIG.
4 through a coupling capacitor 57,
By configuring a power amplifier circuit that discharges the charge of the coupling capacitor 57 through the transistor 53 when it is L (on), the number of parts is small and the transistors 53 and 54 can be turned on and off reliably. It is. 65,6
6 and 67 are resistances.

次に第1図に於ける部品故障時の安全性、フエ
ルセーフ性の説明を行う。
Next, safety and fail-safe properties in the event of component failure in FIG. 1 will be explained.

燃焼検知素子6の断線、短絡故障はいずれも燃
焼炎が発生しても、起電力が発生しない為、電圧
比較器5の出力端子5eがオンオフせず、発振
器7の発振周波数で駆動されないため、燃料弁1
3には通電されない。
In both cases of disconnection and short-circuit failure of the combustion detection element 6, even if a combustion flame occurs, no electromotive force is generated, so the output terminal 5e of the voltage comparator 5 does not turn on or off, and is not driven at the oscillation frequency of the oscillator 7. fuel valve 1
3 is not energized.

また、発振器7が発振しない電圧比較器8の
断線、短絡故障及び電圧比較器5の断線、短絡
故障時にも発振が変成器58に伝わらない為、燃
料弁13には通電されない。
Furthermore, even when the oscillator 7 does not oscillate and the voltage comparator 8 is disconnected or short-circuited, and the voltage comparator 5 is disconnected or short-circuited, the oscillation is not transmitted to the transformer 58, so the fuel valve 13 is not energized.

また、トランジスタ53,54の断線、短絡故
障時でも同様である。要するに各部品故障時に発
振系が成立しないので安全性を確保できる。
The same applies when the transistors 53 and 54 are disconnected or short-circuited. In short, safety can be ensured because the oscillation system is not established when each component fails.

以上のように本発明の燃焼安全装置によれば次
の効果を奏する。
As described above, the combustion safety device of the present invention provides the following effects.

(1) 燃焼炎を検知する燃焼検出素子の出力電圧を
入力とする電圧比較器を動作させると共に、発
振器の発振周波数を重畳させて、燃料弁駆動部
に交流成分を印加することにより、あらゆる部
品の故障に対する安全性、フエールセーフ性が
確保できる。
(1) By operating a voltage comparator that inputs the output voltage of the combustion detection element that detects combustion flame, and by superimposing the oscillation frequency of the oscillator and applying an alternating current component to the fuel valve drive unit, all parts It is possible to ensure safety and fail-safe performance against breakdowns.

(2) 発振器の発振周波数と結合コンデンサと変成
器の共振回路の周波数と合致させることによ
り、正弦波交流が得られ、変成器としての効率
を最大限に利用することができ、小型変成器で
大容量の電流を得ることができる。
(2) By matching the oscillation frequency of the oscillator with the frequencies of the coupling capacitor and the resonant circuit of the transformer, a sine wave alternating current can be obtained and the efficiency of the transformer can be maximized, making it possible to use a small transformer. A large amount of current can be obtained.

(3) 燃焼検知素子の出力電圧を電圧比較器の入力
に印加しているため、数mVで電圧比較器を動
作させることができるので、応答性を高速化す
ることができ、着火応答時間、失火応答時間を
高速にできる。
(3) Since the output voltage of the combustion detection element is applied to the input of the voltage comparator, the voltage comparator can be operated at a few mV, resulting in faster response times and shorter ignition response times. The misfire response time can be made faster.

(4) 失火応答が高速となるので、ガス流出の時間
が従来に比べ短くなり、より安全となる。
(4) Since the misfire response is faster, the time for gas outflow is shorter than before, making it safer.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例を示す回路図、第2
図は電圧比較器の動作波形図、第3図a,bは
電圧比較器の動作波形図、第4図は他の実施例
を示す要部回路図、第5図a,bは電圧比較器
の入力側と出力側の動作波形図、第6図a,bは
電圧比較器の燃焼検出前の入力側と出力側の動
作波形図、第7図a,bは電圧比較器の燃焼検
知後の入力側と出力側の動作波形図である。 4……燃焼検出回路、5……電圧比較器、6
……燃焼検知素子、7……発振器、8……電圧比
較器、9……遅延回路、11……電圧比較器
、12……燃料弁駆動部、53,54……トラ
ンジスタ(スイツチング素子)、57……結合コ
ンデンサ、58……変成器。
Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
The figure is an operating waveform diagram of a voltage comparator, Figures 3a and b are operating waveform diagrams of a voltage comparator, Figure 4 is a main circuit diagram showing another embodiment, and Figures 5a and b are voltage comparators. Figures 6a and b are operating waveform diagrams of the input and output sides of the voltage comparator before combustion detection, and Figures 7a and b are the voltage comparator after combustion detection. FIG. 3 is an operation waveform diagram of the input side and output side of the . 4... Combustion detection circuit, 5... Voltage comparator, 6
... Combustion detection element, 7 ... Oscillator, 8 ... Voltage comparator, 9 ... Delay circuit, 11 ... Voltage comparator, 12 ... Fuel valve drive section, 53, 54 ... Transistor (switching element), 57...Coupling capacitor, 58...Transformer.

Claims (1)

【特許請求の範囲】 1 燃焼炎を検知する燃焼検知素子と、この燃焼
検知素子の出力電圧を入力とする電圧比較器
と、この電圧比較器に燃焼検知素子の出力電圧
を打ち消す方向に発振信号を重畳させる電圧比較
器などで構成された発振器と、前記燃焼検知素
子の入力により前記発振器の発振周波数で駆動さ
れる前記電圧比較器の出力信号で駆動される燃
料弁を制御する燃料弁駆動部を備えると共に前記
電圧比較器の発振出力信号を入力とする遅延回
路を備え、その遅延回路の出力を入力とする電圧
比較器などで構成された遅延タイマ回路の出力
を前記電圧比較器の基準電圧端子に接続し、そ
の基準電圧(前記燃焼検知素子の出力電圧の検知
レベル)を前記燃焼検知素子による着火検出後
に、着火以前の基準電圧から前記燃焼検知素子の
定常出力電圧に近い基準電圧となるようにステツ
プ的に変化させるように構成した燃焼安全装置。 2 燃料弁駆動部において、発振器の発振周波数
で作動する電圧比較器の出力状態がL(オン)
の時、一方のスイツチング素子を通して結合コン
デンサを介して充電し、H(オフ)の時にもう一
方のスイツチング素子を通して結合コンデンサを
介して放電するように構成した電力増幅回路に変
成器を結合し、その二次側で直流成分を得るよう
にしたことを特徴とする特許請求の範囲第1項記
載の燃焼安全装置。 3 電力増幅回路において、結合コンデンサと変
成器とのLC共振の切期振動周波数と発振器の発
振周波数とを合致させ、変成器に正弦波交流を得
るようにしたことを特徴とする特許請求の範囲第
2項記載の燃焼安全装置。 4 燃料弁駆動部において、発振器の発振周波数
で作動する電圧比較器の出力状態が、H(オ
フ)の時、一方のスイツチング素子を通して結合
コンデンサを介して充電し、L(オン)の時にも
う一方のスイツチング素子を通してコンデンサを
介して放電するように構成した電力増幅回路に変
成器を結合し、その二次側で直流成分を得るよう
にしたことを特徴とする特許請求の範囲第1項記
載の燃焼安全装置。 5 電力増幅回路において、発振器の発振周波数
とLC共振の振動周波数とを合致させ、変成器に
正弦波交流を得るようにしたことを特徴とする特
許請求の範囲第4項記載の燃焼安全装置。 6 電圧比較器の出力のL(オン)により、燃
焼炎の失火検出レベルを燃焼検知素子の出力電圧
の着火検出レベルより高くして、失火検出を高速
とならしめるべく電圧比較器に接続したことを
特徴とする特許請求の範囲第1項記載の燃焼安全
装置。
[Claims] 1. A combustion detection element that detects a combustion flame, a voltage comparator that receives the output voltage of the combustion detection element as input, and an oscillation signal applied to the voltage comparator in the direction of canceling the output voltage of the combustion detection element. an oscillator configured with a voltage comparator or the like that superimposes the oscillator, and a fuel valve drive unit that controls a fuel valve that is driven by an output signal of the voltage comparator that is driven at the oscillation frequency of the oscillator based on the input of the combustion detection element. and a delay circuit that receives the oscillation output signal of the voltage comparator as an input, and outputs the output of a delay timer circuit composed of a voltage comparator or the like that receives the output of the delay circuit as the reference voltage of the voltage comparator. terminal, and after the combustion detection element detects ignition, the reference voltage (detection level of the output voltage of the combustion detection element) becomes a reference voltage close to the steady output voltage of the combustion detection element from the reference voltage before ignition. A combustion safety device configured to change in steps. 2 In the fuel valve drive unit, the output state of the voltage comparator that operates at the oscillation frequency of the oscillator is L (ON).
The transformer is coupled to a power amplifier circuit configured to charge through a coupling capacitor through one switching element when the switch is in the high state (off), and discharge through the coupling capacitor through the other switching element when the switch is in the high (off) state. The combustion safety device according to claim 1, characterized in that a direct current component is obtained on the secondary side. 3. Claims characterized in that in a power amplification circuit, the cut-off frequency of LC resonance between a coupling capacitor and a transformer is matched with the oscillation frequency of an oscillator, so that a sine wave alternating current is obtained in the transformer. Combustion safety device according to paragraph 2. 4 In the fuel valve drive unit, when the output state of the voltage comparator that operates at the oscillation frequency of the oscillator is H (off), one switching element is charged via the coupling capacitor, and when it is L (on), the other is charged. Claim 1, characterized in that a transformer is coupled to a power amplifier circuit configured to discharge electricity through a switching element and a capacitor, and a DC component is obtained on the secondary side of the transformer. Combustion safety device. 5. The combustion safety device according to claim 4, wherein in the power amplification circuit, the oscillation frequency of the oscillator and the vibration frequency of the LC resonance are matched to obtain a sine wave alternating current to the transformer. 6. Connected to a voltage comparator in order to make the misfire detection level of the combustion flame higher than the ignition detection level of the output voltage of the combustion detection element by turning the output of the voltage comparator L (on), and to speed up misfire detection. A combustion safety device according to claim 1, characterized in that:
JP1372678A 1978-02-08 1978-02-08 Combustion safety device Granted JPS54106933A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1372678A JPS54106933A (en) 1978-02-08 1978-02-08 Combustion safety device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1372678A JPS54106933A (en) 1978-02-08 1978-02-08 Combustion safety device

Publications (2)

Publication Number Publication Date
JPS54106933A JPS54106933A (en) 1979-08-22
JPS62405B2 true JPS62405B2 (en) 1987-01-07

Family

ID=11841241

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1372678A Granted JPS54106933A (en) 1978-02-08 1978-02-08 Combustion safety device

Country Status (1)

Country Link
JP (1) JPS54106933A (en)

Also Published As

Publication number Publication date
JPS54106933A (en) 1979-08-22

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