JPH0862021A - Method for ascertaining action of water level detection rod - Google Patents

Method for ascertaining action of water level detection rod

Info

Publication number
JPH0862021A
JPH0862021A JP22414694A JP22414694A JPH0862021A JP H0862021 A JPH0862021 A JP H0862021A JP 22414694 A JP22414694 A JP 22414694A JP 22414694 A JP22414694 A JP 22414694A JP H0862021 A JPH0862021 A JP H0862021A
Authority
JP
Japan
Prior art keywords
water level
level detection
detection rod
signal
rod
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.)
Pending
Application number
JP22414694A
Other languages
Japanese (ja)
Inventor
Shigehiro Watanabe
茂広 渡辺
Takashi Morimatsu
隆史 森松
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.)
Miura Co Ltd
Original Assignee
Miura 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 Miura Co Ltd filed Critical Miura Co Ltd
Priority to JP22414694A priority Critical patent/JPH0862021A/en
Publication of JPH0862021A publication Critical patent/JPH0862021A/en
Pending legal-status Critical Current

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  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

PURPOSE: To prevent erroneous action of a water level detection rod by ascertaining the normal action thereof accurately through a convenient method. CONSTITUTION: A water level detection rod delivers an ON signal when the detection end thereof touches a liquid and delivers an OFF signal when the detection end does not touch the liquid. When the output signal makes a transition from ON to OFF or from OFF to ON (ON→OFF→ON or OFF→ON→OFF), a decision is made that the water level detection rod is acting normally.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、液体を貯留する容器
内の水位を検出するための水位検出棒において、この水
位検出棒が正常に作動しているかどうかを確認する水位
検出棒の作動確認方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water level detecting rod for detecting the water level in a container for storing a liquid, and confirms whether or not the water level detecting rod is operating normally. It is about the method.

【0002】[0002]

【従来の技術】従来、液体を貯留する容器内の水位を検
出するための手段として、水位検出棒が広く用いられて
いる。この水位検出棒は、その検出端と液体との接触に
よりON信号が出力され、検出端と液体との接触がない
ときOFF信号が出力される構成になっている。
2. Description of the Related Art Conventionally, a water level detecting rod has been widely used as a means for detecting the water level in a container for storing a liquid. This water level detection rod is configured to output an ON signal when the detection end contacts the liquid, and outputs an OFF signal when the detection end does not contact the liquid.

【0003】ボイラの缶内水位の検出にも上記の水位検
出棒が一般的に用いられており、この水位検出棒からの
出力信号に応じて給水ポンプを稼動させ、缶内水位を所
定のレベルに維持するようにしている。特に、ボイラの
場合、前記水位検出棒が正常に作動していることが非常
に重要であり、水位検出棒が誤動作をして缶内水位を適
正なレベルに維持できないと、空焚き等を起こして重大
な事故につながる危険性がある。例えば、ボイラの缶水
に含まれる不純物が水位検出棒の絶縁部に付着すると、
短絡を生じることがあり、そうなると、缶水が水位検出
棒の検出端に達していなくてもON信号を発することに
なる。また、水位検出棒の表面にスケールが付着した
り、電気配線に断線が生じると、缶水が水位検出棒の検
出端に達していなくてもOFF信号を発することにな
る。
The above-mentioned water level detecting rod is generally used to detect the water level in the can of the boiler. The water supply pump is operated in accordance with the output signal from the water level detecting rod to set the water level in the can to a predetermined level. I try to keep it. Especially in the case of a boiler, it is very important that the water level detection rod is operating normally, and if the water level detection rod malfunctions and the water level inside the can cannot be maintained at an appropriate level, it will cause boiled water etc. There is a risk of causing a serious accident. For example, if impurities contained in boiler boiler water adhere to the insulation of the water level detection rod,
A short circuit may occur, and if so, an ON signal will be emitted even if the can water has not reached the detection end of the water level detection rod. Further, if a scale adheres to the surface of the water level detection rod or a break in the electric wiring occurs, an OFF signal will be emitted even if the can water has not reached the detection end of the water level detection rod.

【0004】[0004]

【発明が解決しようとする課題】この発明は、水位検出
棒が正常に作動していることを的確でかつ簡易な方法で
確認することにより、上述の誤動作を防止することを目
的としている。
SUMMARY OF THE INVENTION An object of the present invention is to prevent the above-mentioned malfunction by confirming that the water level detection rod is operating normally by an accurate and simple method.

【0005】[0005]

【課題を解決するための手段】この発明は、上述の課題
に鑑みてなされたもので、検出端と液体との接触により
ON信号を出力し、検出端と液体との接触がないときO
FF信号を出力する水位検出棒において、ON→OFF
またはOFF→ON(ON→OFF→ONまたはOFF
→ON→OFF)の出力信号の変化があったとき、前記
水位検出棒が正常に作動していると判定することを特徴
としている。
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and outputs an ON signal when the detection end and the liquid come into contact with each other.
ON → OFF in the water level detection rod that outputs the FF signal
Or OFF → ON (ON → OFF → ON or OFF
When there is a change in the output signal (ON → OFF), it is determined that the water level detection rod is operating normally.

【0006】[0006]

【作用】水位が上昇あるいは下降するのに伴い、水位検
出棒からの出力信号がON→OFFまたはOFF→ON
(ON→OFF→ONまたはOFF→ON→OFF)の
ように変化したとき、その水位検出棒には短絡、断線等
の異常が生じていないということであり、その水位検出
棒が正常に作動していると判定する。
[Operation] As the water level rises or falls, the output signal from the water level detection rod turns ON → OFF or OFF → ON
When it changes like (ON → OFF → ON or OFF → ON → OFF), it means that there is no abnormality such as short circuit or disconnection in the water level detection rod, and the water level detection rod operates normally. It is determined that

【0007】[0007]

【実施例】以下、この発明の好ましい実施例について説
明する。図1において、所定の位置に固定された水位検
出棒1に対して、液面2が上昇あるいは下降する構成に
なっている。前記水位検出棒1の検出端(下端部)と液
体との接触によりON信号が出力され、前記水位検出棒
1の検出端(下端部)と液体との接触がないときOFF
信号が出力される。これらのON信号およびOFF信号
は制御装置3へ送られる。そして、予め設定した制御手
順に従って給水ポンプ(図示せず)を稼動、停止させる
ようにしている。前記制御装置3は、給水ポンプ等の機
器へ制御信号を送るための制御回路の他に、前記水位検
出棒1が正常に作動しいるかどうかを確認するための判
定回路も備えている。
The preferred embodiments of the present invention will be described below. In FIG. 1, the liquid level 2 rises or falls with respect to the water level detection rod 1 fixed at a predetermined position. An ON signal is output by the contact between the detection end (lower end) of the water level detection rod 1 and the liquid, and OFF when there is no contact between the detection end (lower end) of the water level detection rod 1 and the liquid.
The signal is output. These ON signal and OFF signal are sent to the control device 3. Then, the water supply pump (not shown) is operated and stopped in accordance with a preset control procedure. The control device 3 includes a control circuit for sending a control signal to a device such as a water supply pump, and a determination circuit for checking whether or not the water level detection rod 1 is normally operating.

【0008】例えば、ボイラの水位制御装置として上記
の構成を適用した場合、次のようになる。給水ポンプの
稼動により水位が上昇し、缶内の水位が水位検出棒1の
検出端に到達するとON信号が出力され、このON信号
受信後、設定時間経過後に給水ポンプが停止する。そし
て、燃焼装置の働きにより缶内の水が加熱されて蒸発
し、水位が水位検出棒1の検出端を切るとOFF信号が
出力され、このOFF信号受信後、設定時間経過後に給
水ポンプが起動する。このようにして、ボイラ缶内の水
位は所定のレベルに維持される。
For example, when the above configuration is applied as a water level control device for a boiler, it becomes as follows. When the water level rises due to the operation of the water supply pump, and the water level in the can reaches the detection end of the water level detection rod 1, an ON signal is output, and after receiving this ON signal, the water supply pump stops after a set time has elapsed. Then, the water inside the can is heated and evaporated by the action of the combustion device, and when the water level cuts off the detection end of the water level detection rod 1, an OFF signal is output, and after the OFF signal is received, the water supply pump is started after the set time has elapsed. To do. In this way, the water level in the boiler can is maintained at a predetermined level.

【0009】前記水位検出棒1が正常に作動しているか
どうかの確認は、次のようにして行う。上述のように、
水位検出棒1からは液面2の上昇および下降に伴って、
ON信号とOFF信号が交互に出力される。従って、O
N→OFFまたはOFF→ONの出力信号の変化があっ
たとき、前記水位検出棒1には短絡、断線等の異常が生
じていないということであり、前記水位検出棒1が正常
に作動していると判定する。また、より確実に水位検出
棒1の作動確認を行う場合には、ON→OFF→ONま
たはOFF→ON→OFFの出力信号の変化を検出し、
これらの出力信号の変化があったとき、前記水位検出棒
1が正常に作動していると判定するようにする。
The confirmation as to whether the water level detecting rod 1 is operating normally is carried out as follows. As mentioned above,
As the liquid level 2 rises and falls from the water level detection rod 1,
The ON signal and the OFF signal are output alternately. Therefore, O
When there is a change in the output signal from N to OFF or from OFF to ON, it means that there is no abnormality such as a short circuit or disconnection in the water level detection rod 1, and the water level detection rod 1 operates normally. Determine that Moreover, in order to confirm the operation of the water level detection rod 1 more reliably, a change in the output signal of ON → OFF → ON or OFF → ON → OFF is detected,
When there is a change in these output signals, it is determined that the water level detection rod 1 is operating normally.

【0010】図2に示す実施例は、第1水位検出棒11
および第2水位検出棒12の2本の水位検出棒を設けた
構成である。同図に示す構成をボイラの水位制御装置に
適用した場合、第1水位検出棒11が給水ポンプ稼動・
停止用、第2水位検出棒12が燃焼装置停止用として用
いられる。即ち、水位が上昇し第1水位検出棒11の検
出端に到達すると、第1水位検出棒11からON信号が
出力され、このON信号受信後、設定時間経過後に制御
装置3からの指令信号を受けて給水ポンプが停止する。
そして、水位が下降し第1水位検出棒11の検出端を切
ると、第1水位検出棒11からOFF信号が出力され、
このOFF信号受信後、設定時間経過後に制御装置3か
らの指令信号を受けて給水ポンプが起動する。このよう
にして、缶内の水位は所定のレベルに維持される。ま
た、不測の事態により、水位が第1水位検出棒11の検
出端を切った後も下降し続け、第2水位検出棒12の検
出端を切ると、第2水位検出棒12からOFF信号が出
力され、このOFF信号受信後、燃焼装置が停止する。
In the embodiment shown in FIG. 2, the first water level detecting rod 11 is used.
The second water level detecting rod 12 is provided with two water level detecting rods. When the configuration shown in the figure is applied to the water level control device of the boiler, the first water level detection rod 11 operates the water supply pump.
The second water level detection rod 12 for stopping is used for stopping the combustion device. That is, when the water level rises and reaches the detection end of the first water level detection rod 11, an ON signal is output from the first water level detection rod 11, and after receiving this ON signal, a command signal from the control device 3 is sent after a set time has elapsed. In response, the water supply pump stops.
Then, when the water level drops and the detection end of the first water level detection rod 11 is cut, an OFF signal is output from the first water level detection rod 11,
After the OFF signal is received, a command signal from the control device 3 is received and a water supply pump is activated after a set time has elapsed. In this way, the water level in the can is maintained at a predetermined level. Further, due to an unexpected situation, the water level continues to drop even after the detection end of the first water level detection rod 11 is cut, and when the detection end of the second water level detection rod 12 is cut, an OFF signal is output from the second water level detection rod 12. After being output and receiving this OFF signal, the combustion device stops.

【0011】図2に示す実施例においても、前述の実施
例と同様に、第1水位検出棒11および第2水位検出棒
12の各水位検出棒において、液面2の上昇および下降
に伴ってON信号とOFF信号が交互に出力される。従
って、各水位検出棒においてON→OFFまたはOFF
→ONの出力信号の変化があったとき、その水位検出棒
には短絡、断線等の異常が生じていないということであ
り、この出力信号の変化があった水位検出棒は正常に作
動していると判定する。また、より確実に第1水位検出
棒11および第2水位検出棒12の作動確認を行う場合
には、ON→OFF→ONまたはOFF→ON→OFF
の出力信号の変化を検出し、これらの出力信号の変化が
あったとき、この出力信号の変化があった水位検出棒は
正常に作動していると判定するようにする。
Also in the embodiment shown in FIG. 2, similarly to the above-mentioned embodiment, the liquid level 2 of each of the first water level detecting rod 11 and the second water level detecting rod 12 rises and falls as the liquid level 2 rises and falls. The ON signal and the OFF signal are output alternately. Therefore, ON → OFF or OFF for each water level detection rod
→ When there is a change in the ON output signal, it means that there is no abnormality such as short circuit or disconnection in the water level detection rod, and the water level detection rod with this output signal change is operating normally. Determine that Further, when confirming the operation of the first water level detection rod 11 and the second water level detection rod 12 more reliably, ON → OFF → ON or OFF → ON → OFF.
Change of the output signal is detected, and when there is a change of these output signals, it is judged that the water level detection rod having the change of this output signal is operating normally.

【0012】図3に示す実施例は、第1水位検出棒1
1、第2水位検出棒12および第3水位検出棒13の3
本の水位検出棒を設けた構成である。同図に示す構成を
ボイラの水位制御装置に適用した場合、第1水位検出棒
11が給水ポンプ停止用、第2水位検出棒12が給水ポ
ンプ起動用、第3水位検出棒13が燃焼装置停止用とし
て用いられる。即ち、水位が上昇し第1水位検出棒11
の検出端に到達すると、第1水位検出棒11からON信
号が出力され、このON信号受信後、給水ポンプが停止
する。そして、水位が下降し第2水位検出棒12の検出
端を切ると、第2水位検出棒12からOFF信号が出力
され、このOFF信号受信後、給水ポンプが起動する。
このようにして、水位は、第1水位検出棒11の検出端
と第2水位検出棒12の検出端との間に維持される。ま
た、不測の事態により、水位が第2水位検出棒12の検
出端を切った後も下降し続け、第3水位検出棒13の検
出端を切ると、第3水位検出棒13からOFF信号が出
力され、このOFF信号受信後、燃焼装置が停止する。
In the embodiment shown in FIG. 3, the first water level detecting rod 1
1, 3 of the second water level detection rod 12 and the third water level detection rod 13
This is a structure provided with a water level detection rod of a book. When the configuration shown in the figure is applied to the water level control device of the boiler, the first water level detection rod 11 is for stopping the water supply pump, the second water level detection rod 12 is for starting the water supply pump, and the third water level detection rod 13 is for stopping the combustion device. Used for. That is, the water level rises and the first water level detection rod 11
When it reaches the detection end of, the ON signal is output from the first water level detection rod 11, and after receiving this ON signal, the water supply pump is stopped. Then, when the water level is lowered and the detection end of the second water level detection rod 12 is cut, an OFF signal is output from the second water level detection rod 12, and after receiving this OFF signal, the water supply pump is activated.
In this way, the water level is maintained between the detection end of the first water level detection rod 11 and the detection end of the second water level detection rod 12. Further, due to an unexpected situation, the water level continues to drop even after the detection end of the second water level detection rod 12 is cut off, and when the detection end of the third water level detection rod 13 is cut off, an OFF signal is output from the third water level detection rod 13. After being output and receiving this OFF signal, the combustion device stops.

【0013】図3に示す実施例においても、前述の実施
例と同様に、第1水位検出棒11、第2水位検出棒12
および第3水位検出棒13の各水位検出棒において、液
面2の上昇および下降に伴ってON信号とOFF信号が
交互に出力される。従って、各水位検出棒においてON
→OFFまたはOFF→ONの出力信号の変化があった
とき、その水位検出棒には短絡、断線等の異常が生じて
いないということであり、この出力信号の変化があった
水位検出棒は正常に作動していると判定する。また、よ
り確実に第1水位検出棒11、第2水位検出棒12およ
び第3水位検出棒13の作動確認を行う場合には、ON
→OFF→ONまたはOFF→ON→OFFの出力信号
の変化を検出し、これらの出力信号の変化があったとき
この出力信号の変化があった水位検出棒は正常に作動し
ていると判定するようにする。
Also in the embodiment shown in FIG. 3, the first water level detecting rod 11 and the second water level detecting rod 12 are similar to the above-mentioned embodiments.
Further, in each water level detection rod of the third water level detection rod 13, an ON signal and an OFF signal are alternately output as the liquid level 2 rises and falls. Therefore, it is turned on at each water level detection rod.
When there is a change in the output signal → OFF or OFF → ON, it means that there is no abnormality such as short circuit or disconnection in the water level detection rod, and the water level detection rod with this output signal change is normal. It is determined that it is working. Further, when the operation confirmation of the first water level detection rod 11, the second water level detection rod 12 and the third water level detection rod 13 is performed more reliably, it is turned on.
Changes in the output signal of OFF → ON or OFF → ON → OFF are detected, and when there is a change in these output signals, it is determined that the water level detection rod that operates with this output signal is operating normally. To do so.

【0014】前述した実施例は、ボイラに適用した場合
を中心に説明したが、この発明は、ボイラ以外にも給水
タンク等の液体を貯留する容器であれば適用することが
できる。また、ボイラ等の装置の起動後、予め設定した
時間内に上記の出力信号の変化が得られないときは警報
を発するようにすることもできる。
Although the above-described embodiments have been mainly described in the case of being applied to the boiler, the present invention can be applied to any container for storing liquid such as a water supply tank other than the boiler. Further, it is possible to issue an alarm when the above-mentioned change of the output signal is not obtained within a preset time after the activation of the apparatus such as the boiler.

【0015】[0015]

【発明の効果】この発明は、以上のような構成であり、
水位検出棒からの出力信号の変化の有無、即ちON→O
FFまたはOFF→ON(ON→OFF→ONまたはO
FF→ON→OFF)の出力信号の変化を検出すること
により、水位検出棒が正常に作動していることを的確に
かつ簡易に確認することできる。従って、水位検出棒の
誤動作を未然に防止して確実な水位検出を行うことがで
きる。また、この発明は水位検出棒が1本でも複数本で
も適用することが可能であり、ON信号およびOFF信
号が出力される水位検出棒全般に用いることができ、実
用上、頗る効果的である。
The present invention has the above-mentioned structure.
Whether or not there is a change in the output signal from the water level detection rod, that is, ON → O
FF or OFF → ON (ON → OFF → ON or O
By detecting a change in the output signal (FF → ON → OFF), it is possible to accurately and simply confirm that the water level detection rod is operating normally. Therefore, it is possible to prevent the malfunction of the water level detection rod and to reliably detect the water level. Further, the present invention can be applied to a single water level detection rod or a plurality of water level detection rods, and can be applied to all water level detection rods that output an ON signal and an OFF signal, which is very effective in practice. .

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の一実施例を示す説明図である。FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

【図2】この発明の他の実施例を示す説明図である。FIG. 2 is an explanatory view showing another embodiment of the present invention.

【図3】この発明のさらに他の実施例を示す説明図であ
る。
FIG. 3 is an explanatory diagram showing still another embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1 水位検出棒 2 液面 3 制御装置 11 第1水位検出棒 12 第2水位検出棒 13 第3水位検出棒 1 Water Level Detection Rod 2 Liquid Level 3 Control Device 11 First Water Level Detection Rod 12 Second Water Level Detection Rod 13 Third Water Level Detection Rod

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 検出端と液体との接触によりON信号を
出力し、検出端と液体との接触がないときOFF信号を
出力する水位検出棒において、ON→OFFまたはOF
F→ONの出力信号の変化があったとき、前記水位検出
棒が正常に作動していると判定することを特徴とする水
位検出棒の作動確認方法。
1. A water level detection rod that outputs an ON signal when the detection end contacts the liquid and outputs an OFF signal when there is no contact between the detection end and the liquid.
A method for confirming the operation of a water level detecting rod, characterized in that it is determined that the water level detecting rod is operating normally when there is a change in the output signal of F → ON.
【請求項2】 検出端と液体との接触によりON信号を
出力し、検出端と液体との接触がないときOFF信号を
出力する水位検出棒において、ON→OFF→ONまた
はOFF→ON→OFFの出力信号の変化があったと
き、前記水位検出棒が正常に作動していると判定するこ
とを特徴とする水位検出棒の作動確認方法。
2. A water level detection rod that outputs an ON signal when the detection end contacts the liquid and outputs an OFF signal when there is no contact between the detection end and the liquid: ON → OFF → ON or OFF → ON → OFF The method for confirming the operation of the water level detecting rod is characterized by determining that the water level detecting rod is operating normally when there is a change in the output signal.
JP22414694A 1994-08-24 1994-08-24 Method for ascertaining action of water level detection rod Pending JPH0862021A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22414694A JPH0862021A (en) 1994-08-24 1994-08-24 Method for ascertaining action of water level detection rod

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22414694A JPH0862021A (en) 1994-08-24 1994-08-24 Method for ascertaining action of water level detection rod

Publications (1)

Publication Number Publication Date
JPH0862021A true JPH0862021A (en) 1996-03-08

Family

ID=16809269

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22414694A Pending JPH0862021A (en) 1994-08-24 1994-08-24 Method for ascertaining action of water level detection rod

Country Status (1)

Country Link
JP (1) JPH0862021A (en)

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