JPS6324217B2 - - Google Patents
Info
- Publication number
- JPS6324217B2 JPS6324217B2 JP56175492A JP17549281A JPS6324217B2 JP S6324217 B2 JPS6324217 B2 JP S6324217B2 JP 56175492 A JP56175492 A JP 56175492A JP 17549281 A JP17549281 A JP 17549281A JP S6324217 B2 JPS6324217 B2 JP S6324217B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- timer
- output
- temperature
- predetermined period
- 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 11
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000006200 vaporizer Substances 0.000 claims description 4
- 230000008016 vaporization Effects 0.000 description 15
- 238000009834 vaporization Methods 0.000 description 14
- 239000003990 capacitor Substances 0.000 description 5
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 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
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Combustion (AREA)
- Regulation And Control Of Combustion (AREA)
Description
【発明の詳細な説明】
本発明は液体燃料燃焼装置の気化ヒータ制御用
サーミスタの断線時の安全装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety device when a thermistor for controlling a vaporization heater of a liquid fuel combustion apparatus is disconnected.
一般に気化ヒータの温度制御をサーミスタ等の
温度依存性素子を用いて行う場合、その使用温度
が約−20℃〜400℃と極端に広い為、サーミスタ
の変化幅も数10MΩ〜数100Ωという値となる。
このように極端に広い抵抗値幅を制御回路で検出
するのは不可能である為、運転スイツチオン後、
所定の時間は断線検知回路が作動しないようなタ
イマー回路が設けられていた。次に断線検知回路
が作動した場合、即時全動作を停止するという方
法をとるとリセツトの繰り返しを行つた場合、気
化部の温度が異常に上昇するという問題がある
為、断線検知回路が作動すると、気化ヒータをオ
フ状態とし、その後、所定時間バーナモータのみ
動作させ気化部を冷却し、その後、全動作を停止
させるという方法が考えられた。ここで従来前記
の断線検知回路のオフタイマーとバーナモータ強
制オンタイマーは、別々のタイマー回路で構成さ
れていた為、非常に高価なものになるという問題
があつた。 Generally, when the temperature of a vaporization heater is controlled using a temperature-dependent element such as a thermistor, the operating temperature is extremely wide from about -20℃ to 400℃, so the variation range of the thermistor is from several 10 MΩ to several 100 Ω. Become.
It is impossible for the control circuit to detect such an extremely wide range of resistance values, so after turning on the operation switch,
A timer circuit was provided to prevent the disconnection detection circuit from operating for a predetermined period of time. Next, if the disconnection detection circuit is activated, it is recommended to immediately stop all operations.If the reset is repeated, the temperature of the vaporizing section will rise abnormally, so if the disconnection detection circuit is activated, A method has been considered in which the vaporization heater is turned off, then only the burner motor is operated for a predetermined period of time to cool the vaporization section, and then all operations are stopped. Conventionally, the off-timer and burner motor forced-on timer of the disconnection detection circuit were constructed from separate timer circuits, which caused a problem in that they were very expensive.
本発明はこの様な問題を解消する為になされた
もので、バーナの気化部の温度を検出するサーミ
スタの断線を検出する比較器の出力で作動する微
分回路の出力を、タイマー回路のリセツト端子に
接続することにより、タイマー回路の初期に前記
比較器の出力をオフさせ、その後前記比較器の出
力があつた場合微分回路により瞬時タイマー回路
のリセツト端子を０とし、同一タイマー回路を、
今度はバーナモータ強制オンタイマーとして作動
させる。この様に１ケのタイマー回路を２つのタ
イマー動作として使用することにより部品点数を
削減し、安価なものとする訳である。 The present invention was made in order to solve this problem, and the output of the differentiating circuit, which is operated by the output of the comparator that detects the disconnection of the thermistor that detects the temperature of the vaporization part of the burner, is connected to the reset terminal of the timer circuit. By connecting the timer circuit to
This time, operate it as a burner motor forced on timer. In this way, by using one timer circuit for two timer operations, the number of parts can be reduced and the cost can be reduced.
以下本発明の一実施例を図に基づき説明する。
１は制御回路用電源、２は液体燃料の気化部温度
検知用サーミスタ、３〜８は抵抗で各検出レベル
設定用、９〜１１は比較器で９は過昇温度検知
用、１０は気化ヒータ制御用、１１は前記気化部
温度検出用サーミスタの断線検知用、１２は気化
ヒータ駆動回路で前記気化ヒータ制御用比較器１
０の出力により作動する、１３は論理和回路で比
較器９と１１の出力を入力とし出力を決定する。
１４はダイオード、１５はプレヒート中後記バー
ナモータ駆動回路３１をオフにロツクしておく為
の自己保持回路、１６〜１８は論理和回路１３の
出力により作動する駆動回路、１９は論理回路、
２０はコンデンサ、２１は抵孔、２２はトランジ
スタでこの20〜22の部品で微分回路を構成、２３
は抵抗、２４はコンデンサ、２５は論理積回路、
２６はタイマー回路、２７はトランジスタ、２８
は抵抗、２９はコンデンサ、３０は安全回路、３
１はバーナモータ駆動回路、３２は燃焼制御回
路、３３は前記安全回路３０により作動する常閉
接点である。 An embodiment of the present invention will be described below based on the drawings.
1 is a power supply for the control circuit, 2 is a thermistor for detecting the temperature of the liquid fuel vaporization part, 3 to 8 are resistors for setting each detection level, 9 to 11 are comparators, 9 is for detecting excessive temperature, 10 is a vaporization heater 11 is for detecting disconnection of the thermistor for detecting the temperature of the vaporization section; 12 is a vaporization heater drive circuit; the comparator 1 for controlling the vaporization heater;
13 is an OR circuit which is activated by the output of 0 and receives the outputs of comparators 9 and 11 as inputs and determines the output.
14 is a diode, 15 is a self-holding circuit for locking off the burner motor drive circuit 31 described later during preheating, 16 to 18 are drive circuits operated by the output of the OR circuit 13, 19 is a logic circuit,
20 is a capacitor, 21 is a resistor, 22 is a transistor, and these components 20 to 22 constitute a differential circuit, 23
is a resistor, 24 is a capacitor, 25 is an AND circuit,
26 is a timer circuit, 27 is a transistor, 28
is a resistor, 29 is a capacitor, 30 is a safety circuit, 3
1 is a burner motor drive circuit, 32 is a combustion control circuit, and 33 is a normally closed contact operated by the safety circuit 30.
以上のような構成を有する制御回路に於いて、
その動作を説明すると、まず正常状態で液体燃料
燃焼装置の気化部温度が断線検知レベル以下より
スタートした場合について述べると気化部温度が
低い為各比較器の入力関係はVa＜Vd＜Vc＜Vb
となり、比較器９の出力は０比較器１０，１１は
出力１となる。これによりヒータ駆動回路１２は
オンでヒータ通電開始、同時に自己保持回路１５
が作動して、バーナモータ駆動回路３１にオフ信
号を出し燃焼停止状態にする。又、比較器１１の
１信号はタイマー回路２６の出力ｆが１の為トラ
ンジスタ２７がオンし、０にロツクさせ論理和回
路１３の出力を０状態とし安全回路３０が作動し
ないようにする。ヒータへの通電により気化部温
度が上昇し、Va＞Vdになると比較器１１の出力
は０となりタイマー回路２６がタイムアツプし出
力ｆが０となり、トランジスタ２７がオフとなつ
ても論理和回路１３の出力は０のまゝであり、安
全回路３０は動作せず正常に動作を続ける。更に
温度が上昇しVa＞Vcになると比較器１０が０と
なりヒータ駆動回路１２がオフとなる。これによ
り気化ヒータへの通電が停止され、同時に自己保
持回路１５に０信号が供給され、バーナモータ駆
動回路３０へのオフ信号が解除される。自己保持
回路１５は一度０信号が入ると０を保持するよう
に構成している。この時点でバーナモータ駆動回
路３１が動作し、バーナモータが駆動、同時に燃
焼制御回路３２へ信号を供給し、燃焼動作を行わ
せる訳である。 In the control circuit having the above configuration,
To explain its operation, we will first discuss the case where the temperature of the vaporization part of the liquid fuel combustion device starts from below the disconnection detection level under normal conditions. Since the temperature of the vaporization part is low, the input relationship of each comparator is Va<Vd<Vc<Vb.
Therefore, the output of comparator 9 is 0, and the output of comparators 10 and 11 is 1. This turns on the heater drive circuit 12 and starts energizing the heater, and at the same time the self-holding circuit 15
is activated and sends an off signal to the burner motor drive circuit 31 to stop combustion. Further, since the output f of the timer circuit 26 is 1, the 1 signal from the comparator 11 turns on the transistor 27 and locks it to 0, thereby setting the output of the OR circuit 13 to the 0 state and preventing the safety circuit 30 from operating. When the temperature of the vaporizer rises due to the energization of the heater and Va>Vd, the output of the comparator 11 becomes 0, the timer circuit 26 times up, the output f becomes 0, and even though the transistor 27 is turned off, the output of the OR circuit 13 remains unchanged. The output remains 0, and the safety circuit 30 does not operate and continues to operate normally. When the temperature further increases and Va>Vc, the comparator 10 becomes 0 and the heater drive circuit 12 is turned off. As a result, the energization to the vaporization heater is stopped, and at the same time, a 0 signal is supplied to the self-holding circuit 15, and the off signal to the burner motor drive circuit 30 is released. The self-holding circuit 15 is configured to hold 0 once a 0 signal is input. At this point, the burner motor drive circuit 31 operates, driving the burner motor, and at the same time supplies a signal to the combustion control circuit 32 to perform the combustion operation.
次に気化部温度検知用サーミスタ２が断線した
場合について述べると、断線状態に於いてはVa
はOvであり、気化部温度がいくら上昇してもVa
＜Vd＜Vc＜Vbの関係が続く、つまり前記説明
した通りヒータへの通電が続く訳である。しかし
ここで比較器１１の出力も１のまゝである為、タ
イマー回路２６がタイムアツプし出力ｆが０、ト
ランジスタ２７がオフ状態になると、論理和回路
１３は１状態となり、駆動回路１６〜１８をオン
させ、ヒータ駆動回路１２をオフし、バーナモー
タ駆動回路３１をオンさせる。同時に論理和回路
１９を１状態とし、抵抗２１、コンデンサ２０、
トランジスタ２２で構成する微分回路を作動させ
る。つまりコンデンサ２０、抵抗２１で定まる時
定数でトランジスタ２２を瞬時オンさせ、タイマ
ー回路２６のリセツト端子ｅを瞬時０とし、リセ
ツトする。これによりタイマー回路２６は再度カ
ウントし、所定時間前記シーケンスつまりバーナ
モータのみオン状態を継続する。所定時間経過す
ると、論理積回路２５が１状態となり安全回路３
０へ信号を供給し接点３３を開状態とし、全動作
を停止する。 Next, we will discuss the case where the thermistor 2 for detecting the temperature of the vaporizer is disconnected.
is Ov, and no matter how much the vaporizer temperature rises, Va
The relationship <Vd<Vc<Vb continues, that is, the heater continues to be energized as explained above. However, since the output of the comparator 11 also remains at 1, when the timer circuit 26 times out and the output f becomes 0 and the transistor 27 turns off, the OR circuit 13 goes to the 1 state, and the driving circuits 16 to 18 is turned on, the heater drive circuit 12 is turned off, and the burner motor drive circuit 31 is turned on. At the same time, the OR circuit 19 is set to 1 state, and the resistor 21, capacitor 20,
The differential circuit made up of the transistor 22 is activated. That is, the transistor 22 is turned on instantaneously with a time constant determined by the capacitor 20 and the resistor 21, and the reset terminal e of the timer circuit 26 is instantaneously set to 0, thereby resetting it. As a result, the timer circuit 26 counts again and continues the above sequence, that is, only the burner motor remains on for a predetermined period of time. After a predetermined period of time has elapsed, the AND circuit 25 enters the 1 state and the safety circuit 3
0, the contact 33 is opened, and all operations are stopped.
この様に本発明によると、バーナの気化部の温
度を検出するサーミスタの断線を検出する比較器
の出力で作動する微分回路の出力をタイマー回路
のリセツト端子に接続することにより２つのタイ
マー動作を１ケのタイマー回路で構成することが
出来、部品点数の削減し、コストの低減が図れる
ものである。 As described above, according to the present invention, two timer operations can be performed by connecting the output of the differential circuit operated by the output of the comparator that detects disconnection of the thermistor that detects the temperature of the vaporization part of the burner to the reset terminal of the timer circuit. It can be configured with one timer circuit, reducing the number of parts and cost.
図は本発明の一実施例にかかる液体燃料燃焼装
置の安全回路を示す電気回路図である。
２……温度検知用サーミスタ、２６……タイマ
ー回路、ｅ……リセツト端子。
The figure is an electrical circuit diagram showing a safety circuit of a liquid fuel combustion device according to an embodiment of the present invention. 2...Thermistor for temperature detection, 26...Timer circuit, e...Reset terminal.
Claims (1)
用サーミスタと直列に抵抗を接続し、その接続点
を１つの入力とし、通常のON・OFF制御温度以
下のレベルに設定した基準レベルをもう一方の入
力とする比較器により構成された断線検知回路
と、運転開始初期所定時間作動しリセツト端子に
信号を供給することにより、タイマー動作が初期
化されるようなタイマー回路と、このタイマー回
路の出力により前記断線検知回路の出力をオフ状
態にロツクする回路と、前記断線検知回路の作動
時、前記タイマー回路の出力により所定時間バー
ナモータ駆動回路をオンさせる回路を備え、前記
タイマー回路のタイムアツプ時に前記断線検知回
路の出力により作動する微分回路の出力を前記タ
イマー回路のリセツト端子に接続し、１つのタイ
マー回路で前記オフ回路とオン回路を制御する液
体燃料燃焼装置の安全回路。1 Connect a resistor in series with the temperature detection thermistor installed in the vaporizer that vaporizes liquid fuel, use the connection point as one input, and use the reference level set below the normal ON/OFF control temperature as the other input. A disconnection detection circuit constituted by a comparator as an input, a timer circuit that operates for a predetermined period at the beginning of operation and initializes the timer operation by supplying a signal to the reset terminal, and the output of this timer circuit. and a circuit that turns on the burner motor drive circuit for a predetermined period of time according to the output of the timer circuit when the disconnection detection circuit is activated, and when the timer circuit times up, the burner motor drive circuit is turned on for a predetermined period of time. A safety circuit for a liquid fuel combustion device, in which the output of a differential circuit activated by the output of the detection circuit is connected to the reset terminal of the timer circuit, and the off-circuit and on-circuit are controlled by one timer circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56175492A JPS5875624A (en) | 1981-10-30 | 1981-10-30 | Safety circuit for liquid fuel burning apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56175492A JPS5875624A (en) | 1981-10-30 | 1981-10-30 | Safety circuit for liquid fuel burning apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5875624A JPS5875624A (en) | 1983-05-07 |
| JPS6324217B2 true JPS6324217B2 (en) | 1988-05-19 |
Family
ID=15996986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56175492A Granted JPS5875624A (en) | 1981-10-30 | 1981-10-30 | Safety circuit for liquid fuel burning apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5875624A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH036413U (en) * | 1989-06-09 | 1991-01-22 |
-
1981
- 1981-10-30 JP JP56175492A patent/JPS5875624A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH036413U (en) * | 1989-06-09 | 1991-01-22 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5875624A (en) | 1983-05-07 |
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