JPH0512581A - Fault detecting device for ultraviolet discharge tube - Google Patents
Fault detecting device for ultraviolet discharge tubeInfo
- Publication number
- JPH0512581A JPH0512581A JP18704691A JP18704691A JPH0512581A JP H0512581 A JPH0512581 A JP H0512581A JP 18704691 A JP18704691 A JP 18704691A JP 18704691 A JP18704691 A JP 18704691A JP H0512581 A JPH0512581 A JP H0512581A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- shutter
- discharge
- flame
- self
- 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.)
- Granted
Links
Landscapes
- Fire-Detection Mechanisms (AREA)
- Emergency Alarm Devices (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は燃焼装置の火炎監視等
に用いられる紫外線放電管の故障を検出するための紫外
線放電管の故障検出装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet discharge tube failure detection device for detecting a failure of an ultraviolet discharge tube used for flame monitoring of a combustion apparatus.
【0002】[0002]
【従来の技術】従来より燃焼装置においてバーナの火炎
を監視するために紫外線放電管(以下、UVチューブと
言う)が用いられている。UVチューブは火炎から放射
される紫外線が入射することにより、電極間に放電が生
じるように構成された放電管である。2. Description of the Related Art Conventionally, an ultraviolet discharge tube (hereinafter referred to as a UV tube) has been used in a combustion apparatus to monitor a burner flame. The UV tube is a discharge tube configured to generate a discharge between electrodes when ultraviolet rays emitted from a flame enter.
【0003】[0003]
【発明が解決しようとする課題】従来のUVチューブ
は、劣化等の異常により紫外線が入射していなくても、
何らかのきっかけで自己放電を誘発するような故障が生
じることがある。UVチューブを火炎の監視に用いる場
合、上記のような故障が発生すると、火炎が無いのに火
炎検出信号が得られることになり、非常に危険である。
このような場合従来では完全な自己放電状態となったと
き凝似火炎が検出されたものとして燃焼装置を停止させ
て安全を保つように成されているが、実際に装置が停止
するまでの時間は凝似火炎か否かが判断できず、この間
燃料が供給される等の不都合が生じ、システム運用上の
大きな問題となっていたものである。In the conventional UV tube, even if ultraviolet rays do not enter due to abnormality such as deterioration,
A failure that causes self-discharge may occur for some reason. When the UV tube is used for flame monitoring, if the above-mentioned failure occurs, a flame detection signal is obtained even if there is no flame, which is extremely dangerous.
In such a case, in the past, when a complete self-discharge state was reached, a similar flame was detected and the combustion device was stopped to maintain safety, but the time until the device actually stops It was not possible to determine whether or not the flame was a similar flame, and during this time, inconveniences such as fuel supply occurred, which was a major problem in system operation.
【0004】この発明は上記の実情に鑑み成されたもの
で、UVチューブの自己放電を早期に検出することので
きるUVチューブの故障検出装置を提供することを目的
としている。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a UV tube failure detection device capable of early detection of self-discharge of the UV tube.
【0005】[0005]
【課題を解決するための手段】この発明に係るUVチュ
ーブの故障検出装置においてはUVチューブの入射紫外
線を遮断するシャッタを設け、このシャッタの遮断時に
UVチューブの出力の変化率を測定し、一定の変化率よ
り小さいとき自己放電と見做して警報等の信号を出すよ
うにしたものである。In the UV tube failure detecting apparatus according to the present invention, a shutter for blocking the incident ultraviolet rays of the UV tube is provided, and the change rate of the output of the UV tube is measured at the time of blocking the shutter, and a constant value is measured. When the rate of change is smaller than the change rate, it is regarded as self-discharge and a signal such as an alarm is issued.
【0006】[0006]
【作用】UVチューブは自己放電の傾向が強くなると、
紫外線の入射状態からシャッタを閉じても、UVチュー
ブの出力が下がりにくくなるので、UVチューブが火炎
を検出している状態で定期的にシャッタを閉じ、その間
におけるUVチューブの変化を見ることにより、故障を
知ることができる。[Function] When the UV tube becomes more prone to self-discharge,
Even if the shutter is closed from the incident state of ultraviolet rays, the output of the UV tube is difficult to decrease. You can know the breakdown.
【0007】[0007]
【実施例】図1はUVチューブを燃焼装置の火炎監視に
用い場合の実施例を示す。図1において、バーナ1の火
炎2はUVチューブ3により監視される。火炎2とUV
チューブ3との間にはシャッタ4が配されていて、通常
はこのシャッタ4は開放され点線で示す位置にある。火
炎2が有るときはUVチューブ3は放電し、その放電電
流が測定手段としての火炎検出回路5に加えられ、ここ
で電圧VFに変換される。この電圧VF は火炎検出信号
として後段の燃焼制御システムに送られるとともに、A
/D変換回路6でディジタルデータに変換されてマイク
ロコンピュータ等の演算装置7に送られる。EXAMPLE FIG. 1 shows an example in which a UV tube is used for flame monitoring of a combustion apparatus. In FIG. 1, the flame 2 of the burner 1 is monitored by a UV tube 3. Flame 2 and UV
A shutter 4 is provided between the tube 3 and the tube 3. Normally, the shutter 4 is opened and is in a position shown by a dotted line. When the flame 2 is present, the UV tube 3 is discharged, and the discharge current is applied to the flame detection circuit 5 as the measuring means, where it is converted into the voltage V F. This voltage V F is sent to the combustion control system in the subsequent stage as a flame detection signal, and
The data is converted into digital data by the / D conversion circuit 6 and sent to the arithmetic unit 7 such as a microcomputer.
【0008】演算装置7はシャッタ制御回路8を制御す
ると共に上記ディジタルデータに基いて所定の演算を行
い、UVチューブ3の故障が検出されたときは故障検出
信号を出力する。シャッタ制御回路8は演算装置7の指
示に基いてシャッタ開閉信号VSHによりシャッタ4を定
期的に開閉制御する。The arithmetic unit 7 controls the shutter control circuit 8 and performs a predetermined arithmetic operation based on the digital data, and outputs a failure detection signal when a failure of the UV tube 3 is detected. The shutter control circuit 8 periodically controls the opening / closing of the shutter 4 by the shutter opening / closing signal V SH based on an instruction from the arithmetic unit 7.
【0009】次に上記構成による動作について図2のタ
イミングチャートを用いて説明する。シャッタ4はシャ
ッタ制御回路8からのシャッタ開閉信号VSHにより定期
的に所定時間tA づつ閉ざされるように制御される。バ
ーナ1に火炎2が有って正常な燃焼が行われている状態
では、この火炎2はシャッタ4の開放時にUVチューブ
3で検出され、このとき火炎検出回路5の出力電圧VF
は図2の略一定レベルVF1の火炎検出信号を出力してい
る。次に、この状態からシャッタ4が実線で示す位置に
移動して所定時間tA だけ閉ざされると、UVチューブ
3に入射する火炎2からの紫外線が遮断されて放電が停
止し、従って、火炎検出回路5の出力電圧VFはVF1か
ら下降する。Next, the operation of the above configuration will be described with reference to the timing chart of FIG. The shutter 4 is controlled by the shutter opening / closing signal V SH from the shutter control circuit 8 so as to be periodically closed for a predetermined time t A. In a state where the burner 1 has the flame 2 and the normal combustion is performed, the flame 2 is detected by the UV tube 3 when the shutter 4 is opened, and at this time, the output voltage V F of the flame detection circuit 5 is detected.
Outputs a flame detection signal having a substantially constant level V F1 in FIG. Next, when the shutter 4 is moved from this state to the position shown by the solid line and closed for a predetermined time t A , the ultraviolet rays from the flame 2 incident on the UV tube 3 are blocked and the discharge is stopped, and therefore the flame detection is performed. The output voltage V F of the circuit 5 drops from V F1 .
【0010】このときUVチューブ3が正常であれば、
電圧VF は図2のVF1からVF3まで速やかに下降し、時
間tA の経過後、シャッタ4が再び開放されると再びV
F1に復帰する。しかしUVチューブ3に自己放電の傾向
が強くなると、シャッタ4が閉じた後でも、放電が速や
かに停止せず徐々に放電が無くなっていくので、電圧V
F も徐々に下っていく。At this time, if the UV tube 3 is normal,
The voltage V F rapidly drops from V F1 to V F3 in FIG. 2, and when the shutter 4 is opened again after the time t A has elapsed, the voltage V F becomes V V again.
Return to F1 . However, when the tendency of self-discharge in the UV tube 3 becomes strong, even after the shutter 4 is closed, the discharge does not stop immediately and gradually disappears.
F gradually goes down.
【0011】この発明においては、電圧VF をA/D変
換回路6で変換したディジタルデータに基いて演算装置
7において、シャッタ4が閉じてから所定時間tB にお
ける電圧VF を経時的に測定し、その変化率Kを算出
し、この変化率KによりUVチューブ3の故障を判定す
るようにしている。[0011] In the present invention, the arithmetic unit 7 on the basis of the voltage V F to the digital data converted by A / D converter circuit 6, measured over time voltage V F at the predetermined time t B from the shutter 4 is closed Then, the change rate K is calculated, and the failure of the UV tube 3 is determined based on the change rate K.
【0012】図2に示すようにシャッタ4が閉じてから
所定時間tB 後における電圧VF の大きさVF2を求め
る。変化率Kは上記VF2とVF1とにより、 K=(VF1−VF2)/tB で求めることができる。この変化率Kと所定の自己放電
判定レベルKA とを比較し、K≧K4 のときUVチュー
ブ3は正常と判断し、K<KA のときUVチューブ3は
故障があると判断し故障検出信号を出力する。As shown in FIG. 2, the magnitude V F2 of the voltage V F after a predetermined time t B has passed since the shutter 4 was closed is determined. The rate of change K can be obtained by K = (V F1 −V F2 ) / t B from the above V F2 and V F1 . This change rate K is compared with a predetermined self-discharge determination level K A, and when K ≧ K 4 , it is determined that the UV tube 3 is normal, and when K <K A , it is determined that the UV tube 3 has a failure. Output the detection signal.
【0013】上記自己放電判断レベルKA の決定方法と
して例えば次の方法が考えられる。 (1)シャッタ4の開放時の火炎検出信号のレベルVF1
に応じたKA を予めテーブル化して登録して置く。 (2)燃焼装置の初期運転時におけるシャッタ4の数回
の開閉により得られる変化率Kの平均値をKA とする。The following method can be considered as a method of determining the self-discharge determination level K A. (1) Level V F1 of flame detection signal when shutter 4 is open
The K A corresponding to the above is made into a table in advance and registered and placed. (2) Let K A be the average value of the rate of change K obtained by opening and closing the shutter 4 several times during the initial operation of the combustion apparatus.
【0014】[0014]
【発明の効果】この発明のよれば、UVチューブに入射
する紫外線を遮断するシャッタを設け、このシャッタが
閉じたときから所定時間における火炎検出信号のレベル
の変化率を監視し、変化率が所定の大きさを越えたとき
UVチューブの故障と判断するように構成したので、U
Vチューブの自己放電による故障を早期に検出すること
ができ、このため燃焼装置の安全性を高めることができ
ると共に、メンテナンス性を向上させることができ、さ
らにUVチューブのより厳密な寿命管理を行うことがで
きる等の効果が得られる。According to the present invention, a shutter for blocking the ultraviolet rays entering the UV tube is provided, and the rate of change of the level of the flame detection signal is monitored for a predetermined time after the shutter is closed, and the rate of change is predetermined. Since it is configured to judge that the UV tube has failed when the size exceeds U,
A failure due to self-discharge of the V tube can be detected at an early stage, so that the safety of the combustion device can be improved and the maintainability can be improved, and more strict life management of the UV tube is performed. It is possible to obtain effects such as being able to.
【図1】この発明の一実施例による紫外線放電管の故障
検出装置を示す構成図である。FIG. 1 is a configuration diagram showing a failure detection device for an ultraviolet discharge tube according to an embodiment of the present invention.
【図2】同装置の動作を説明するためのタイミングチャ
ートである。FIG. 2 is a timing chart for explaining the operation of the device.
3 紫外線放電管 4 シャッタ 5 火炎検出回路 7 演算装置 3 UV discharge tube 4 Shutter 5 Flame detection circuit 7 Arithmetic device
Claims (1)
手段と、上記紫外線放電管に入射する紫外線を遮断する
シャッタ手段と、上記シャッタ手段により紫外線の入射
が遮断されているときに上記測定回路の出力を経時的に
測定しその変化率が所定の値より小さいとき信号を出力
する演算手段とを備えた紫外線放電管の故障検出装置。Claim: What is claimed is: 1. A measuring means for measuring a discharge current of an ultraviolet discharge tube, a shutter means for blocking ultraviolet rays entering the ultraviolet discharge tube, and a shutter means for blocking incident ultraviolet rays. An apparatus for detecting a failure of an ultraviolet discharge tube, comprising: an arithmetic means for measuring the output of the measuring circuit over time when the change rate is present and outputting a signal when the rate of change is smaller than a predetermined value.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3187046A JP2561981B2 (en) | 1991-07-02 | 1991-07-02 | UV discharge tube failure detection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3187046A JP2561981B2 (en) | 1991-07-02 | 1991-07-02 | UV discharge tube failure detection device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0512581A true JPH0512581A (en) | 1993-01-22 |
JP2561981B2 JP2561981B2 (en) | 1996-12-11 |
Family
ID=16199227
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3187046A Expired - Lifetime JP2561981B2 (en) | 1991-07-02 | 1991-07-02 | UV discharge tube failure detection device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2561981B2 (en) |
Cited By (10)
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---|---|---|---|---|
KR100830779B1 (en) * | 2005-04-06 | 2008-05-20 | 오므론 가부시키가이샤 | Ultraviolet illuminating apparatus |
WO2016182732A1 (en) * | 2015-05-13 | 2016-11-17 | Honeywell International Inc. | Utilizing a quench time to deionize an ultraviolet (uv) sensor tube |
WO2016182734A1 (en) * | 2015-05-13 | 2016-11-17 | Honeywell International Inc. | Determining failure of an ultraviolet sensor |
JP2020153754A (en) * | 2019-03-19 | 2020-09-24 | アズビル株式会社 | Fire detection system and received light quantity measuring method |
JP2020153753A (en) * | 2019-03-19 | 2020-09-24 | アズビル株式会社 | Fire detection system, discharge probability calculation method, and received light quantity measuring method |
JP2020165831A (en) * | 2019-03-29 | 2020-10-08 | アズビル株式会社 | Flame detection system and fault diagnosis method |
KR20210105298A (en) | 2020-02-18 | 2021-08-26 | 아즈빌주식회사 | Light detection system and discharge probability calculation method |
KR20210105299A (en) | 2020-02-18 | 2021-08-26 | 아즈빌주식회사 | Light detection system, discharge probability calculation method, and light receiving amount measurement method |
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-
1991
- 1991-07-02 JP JP3187046A patent/JP2561981B2/en not_active Expired - Lifetime
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100830779B1 (en) * | 2005-04-06 | 2008-05-20 | 오므론 가부시키가이샤 | Ultraviolet illuminating apparatus |
WO2016182732A1 (en) * | 2015-05-13 | 2016-11-17 | Honeywell International Inc. | Utilizing a quench time to deionize an ultraviolet (uv) sensor tube |
WO2016182734A1 (en) * | 2015-05-13 | 2016-11-17 | Honeywell International Inc. | Determining failure of an ultraviolet sensor |
US11280672B2 (en) | 2019-03-19 | 2022-03-22 | Azbil Corporation | Flame detection system, discharge probability calculating method, and received light quantity measuring method |
JP2020153754A (en) * | 2019-03-19 | 2020-09-24 | アズビル株式会社 | Fire detection system and received light quantity measuring method |
JP2020153753A (en) * | 2019-03-19 | 2020-09-24 | アズビル株式会社 | Fire detection system, discharge probability calculation method, and received light quantity measuring method |
CN111721404A (en) * | 2019-03-19 | 2020-09-29 | 阿自倍尔株式会社 | Flame detection system and light receiving amount measurement method |
CN111721404B (en) * | 2019-03-19 | 2023-01-24 | 阿自倍尔株式会社 | Flame detection system and light receiving amount measurement method |
US11428575B2 (en) | 2019-03-19 | 2022-08-30 | Azbil Corporation | Flame detection system and received light quantity measuring method |
JP2020165831A (en) * | 2019-03-29 | 2020-10-08 | アズビル株式会社 | Flame detection system and fault diagnosis method |
KR20210105299A (en) | 2020-02-18 | 2021-08-26 | 아즈빌주식회사 | Light detection system, discharge probability calculation method, and light receiving amount measurement method |
CN113340413A (en) * | 2020-02-18 | 2021-09-03 | 阿自倍尔株式会社 | Light detection system, discharge probability calculation method, and light receiving amount measurement method |
US11346711B2 (en) | 2020-02-18 | 2022-05-31 | Azbil Corporation | Light detection system, discharge probability calculating method, and received light quantity measuring method |
US11359962B2 (en) | 2020-02-18 | 2022-06-14 | Azbil Corporation | Light detection system, discharge probability calculating method, and received light quantity measuring method |
US11402261B2 (en) | 2020-02-18 | 2022-08-02 | Azbil Corporation | Light detection system, discharge probability calculating method, and received light quantity measuring method |
KR20210105293A (en) | 2020-02-18 | 2021-08-26 | 아즈빌주식회사 | Light detection system, discharge probability calculation method and light receiving amount measurement method |
KR20210105298A (en) | 2020-02-18 | 2021-08-26 | 아즈빌주식회사 | Light detection system and discharge probability calculation method |
Also Published As
Publication number | Publication date |
---|---|
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