JPS58191929A - Induction type level gauge - Google Patents

Induction type level gauge

Info

Publication number
JPS58191929A
JPS58191929A JP7336482A JP7336482A JPS58191929A JP S58191929 A JPS58191929 A JP S58191929A JP 7336482 A JP7336482 A JP 7336482A JP 7336482 A JP7336482 A JP 7336482A JP S58191929 A JPS58191929 A JP S58191929A
Authority
JP
Japan
Prior art keywords
coil
liquid level
circuit
coils
switching
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
JP7336482A
Other languages
Japanese (ja)
Inventor
Sakae Ogiwara
荻原　栄
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP7336482A priority Critical patent/JPS58191929A/en
Publication of JPS58191929A publication Critical patent/JPS58191929A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

PURPOSE:To improve the reliability, by switching optional one of >=3 coils to use as an exciting coil, and use another one as a detecting coil in an induction type level gauge which detects the level of a conductive liquid. CONSTITUTION:Lead wires 10a, 11a, and 12a of a level sensor 9 consisting of the first, the second, and the third exciting coils 10-12 wound around a single bobbin are connected to a switching circuit 16 consisting of changeover switches 17-19 through a connector 13 and a multicore cable 14. By switching of the circuit 16, an optional coil is connected to an energizing power source 20, and another one is connected to an indicator 22 and an alarm setter 23 through a detecting circuit 21, thereby constituting the level gauge. Thus, three kinds of combination of coils are available to use as the level gauge by switching when coils 10-12 and etc. are faulty, and further, mutual check is performed.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は導電性液体の液位な連続的に検出する誘導型液
面計に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an inductive liquid level gauge that continuously detects the level of a conductive liquid.

〔発明の技術的背景と問題点〕[Technical background and problems of the invention]

＾速増殖炉においては冷却材として液体ナトリウムが使
用されるが、このような導電性液体の液面の検出には保
守が容具で構造が簡単な誘導型液面針が用いられる。In fast breeder reactors, liquid sodium is used as a coolant, and to detect the level of such conductive liquid, an inductive liquid level needle, which is easy to maintain and has a simple structure, is used.

この誘導型液面針には、液位を連続して測定する連続式
と、固定点毎に測定する固定点式の２種類がある。There are two types of guide type liquid level needles: a continuous type that measures the liquid level continuously, and a fixed point type that measures the liquid level at each fixed point.

前者は固定点式に比べ精度の点で劣るが、液位を連続し
て測定出来る利点がある。Although the former method is inferior in accuracy to the fixed point method, it has the advantage of being able to measure the liquid level continuously.

最近の原子力発峨プラントでは、原子炉容器の冷却材の
液位を連続して、しかも誤動作なく監視することが最も
重要なこととなってきており、また原子炉容器の冷却材
の液位によって、プラントを停止したり、機器を起動・
停止させる機能も要求されるところから、冷却材の液位
な検知する液面針には、更に高い信頼性が要求されるよ
うにな〕てきた。In recent nuclear power plants, it has become most important to monitor the coolant level in the reactor vessel continuously and without malfunction. , shut down the plant, start up equipment,
Since a stop function is also required, the liquid level needle that detects the coolant level is required to have even higher reliability.

従来の連続式液面針は第１図に示すように、励磁電源１
にコネクタ２を介して・励磁コイル６を接続し、この励
磁コイル３と共軸に巻回した検出コイル４の出力をコネ
クタ２を介して検出回路５に導き、この検出回路５の出
力を指示針６に導いて液位な表示するよう構成されてい
る。As shown in Figure 1, the conventional continuous liquid level needle has an excitation power source 1.
An excitation coil 6 is connected to the excitation coil 6 via the connector 2, and the output of the detection coil 4 wound coaxially with the excitation coil 3 is led to the detection circuit 5 via the connector 2, and the output of the detection circuit 5 is instructed. It is configured to guide the needle 6 and display the liquid level.

励磁電＃１と検出回路５および指示針６は普通、液面計
センナ７から離れた制御室に設置されており、それらと
センナ７側のコネクタ２の間は、ケーブル８によって結
ばれている。The excitation electric #1, the detection circuit 5, and the indicator needle 6 are normally installed in a control room separate from the liquid level gauge senna 7, and a cable 8 connects them to the connector 2 on the senna 7 side. .

高速増殖炉において、冷却材として使用される液体金属
ナトリウムは高温下で循環されるので、液ｔｉｏｇｔセ
ンサ７も２００℃〜５００℃程度の非常に高い温度雰囲
気下に置かれることになる。In a fast breeder reactor, liquid metal sodium used as a coolant is circulated at high temperatures, so the liquid tiogt sensor 7 is also placed in an extremely high temperature atmosphere of about 200°C to 500°C.

このため、液面針センナ７としては、励磁コイル６と検
出コイル４およびそれらのリード線３ａｐ４ａ　４に：
両温に銅えるよう、絶縁材に酸化マグネシウムを用い、
これをステンレスで被覆したＭＩケーブルで構成するよ
うにしている。Therefore, as the liquid level needle sensor 7, the excitation coil 6, the detection coil 4, and their lead wires 3ap4a4:
Magnesium oxide is used as an insulating material so that copper can withstand both temperatures.
This is made up of an MI cable coated with stainless steel.

この上うな尚温条件Ｆに設置される液面計センサ７には
各楠の構成材料に大きな熱応力かががるため、ＭＩケー
ブルに絶縁劣化や、断線等の故障が多発していた。Moreover, in the liquid level gauge sensor 7 installed under such a still temperature condition F, a large thermal stress was applied to the constituent materials of each camphor tree, so failures such as insulation deterioration and disconnection occurred frequently in the MI cable.

この場合、１ケ所の絶縁劣化や断線によっても、液面計
センナ７は、使用不能となり、新しい液面計と交換しな
ければならないため、その間、液位の監視ができないこ
とになり、場合によっては、プラントを停止しなければ
ならないという不都合があった。In this case, even if the insulation deteriorates or breaks in one place, the liquid level gauge senna 7 becomes unusable and must be replaced with a new liquid level gauge, making it impossible to monitor the liquid level during that time. had the inconvenience of having to shut down the plant.

また、１４！続式液面針は温度変化による出力のドリフ
トが大さく、温度補償を行なう必要がある。Also, 14! Continuous liquid level needles have large output drifts due to temperature changes, so temperature compensation is required.

従来は、検出コイルの温度変化による抵抗変化を検知し
て検出コイルの出力にフィードバツクさせ、温度ドリフ
ト分を補償するという方法が採用されていたが、この場
合にも上記したように、１本のＭＩケーブルで、検出コ
イル４と、温度補償コイルおよびコネクタ２までのリー
ド＆、　４　ｍを構成しているため、１ケ所の絶縁劣化
や断線で、液面針として作動しなくなるという不都合が
あった。Conventionally, a method was adopted in which resistance changes due to temperature changes in the detection coil were detected and fed back to the output of the detection coil to compensate for temperature drift. Since the MI cable consists of 4 m of leads from the detection coil 4 to the temperature compensation coil and connector 2, there is an inconvenience that if the insulation deteriorates or breaks in one place, it will no longer function as a liquid level needle. Ta.

〔発明の目的〕[Purpose of the invention]

本発明は背景技術における上述の如き不都合を除去する
ために創案されたもので、過酷な条件下においても（Ａ
軸性の商い、連続式の誘導型液面針を提供することを目
的とする。The present invention was devised to eliminate the above-mentioned disadvantages in the background art, and even under severe conditions (A
The purpose of the present invention is to provide an axial, continuous, guided liquid level needle.

〔発明の概要〕[Summary of the invention]

本発明の誘導型液面針は導電性液体の液位な検出する誘
導型液面＃１において、液面センサが狂いに結合する３
個以上のコイルを具備しており、これらのコイルからの
リード線と、励磁電源および検出回路との間に介挿した
切替回路により、前記３個以上のコイルのうちの任意の
１個を励磁コイルとし、他の１個を検出コイルとして切
替えることができるよう構成されている。The inductive liquid level needle of the present invention detects the liquid level of the conductive liquid at the inductive liquid level #1, where the liquid level sensor connects in an irregular manner.
It is equipped with three or more coils, and any one of the three or more coils can be excited by a switching circuit inserted between the lead wires from these coils and the excitation power supply and detection circuit. It is configured so that one coil can be used as a detection coil and the other one can be switched as a detection coil.

し発明の実施例〕 以ト、本発明の実施例を第２図を参照して説明Ｃる。１ 第２図において、液面針センサ９はＭｌケーブルから成
るｆｉｔのコイル１０、第２のコイル１１、第３のコイ
ル１２の計３個のコイルを単一ボビン（図示せず）に巻
装して構成されており、各コイルからのリード線１０ｍ
、ｌ１ｍ、１２ｍはコネクタ１６に接続されている。Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described with reference to FIG. 1 In Fig. 2, the liquid level needle sensor 9 consists of a total of three coils, a fit coil 10, a second coil 11, and a third coil 12, each made of an Ml cable, wound around a single bobbin (not shown). The lead wire from each coil is 10m.
, l1m, and 12m are connected to the connector 16.

各コイル１０，１１．１２の巻装長さは３個とも等しく
、液位の測定範囲によって決定される。The winding length of each coil 10, 11.12 is the same for all three coils, and is determined by the measurement range of the liquid level.

コネクタ１６は１本の多芯ケーブル１４によって、制御
室に設置されている切替回路１６へ接続されている。The connector 16 is connected by one multicore cable 14 to a switching circuit 16 installed in the control room.

切替回路１６は３個の切替スイク’ＰＩ　７　、１８゜
１９により構成されており、各切替スイッチは双投式の
３点接点より成り、第１僧点は励磁ｉｉｌ源２０に、＄
２２接は検出回路２１に接続されている。The switching circuit 16 is composed of three switching switches 'PI 7, 18° 19, each switching switch is composed of a double-throw type three-point contact, and the first point is connected to the excitation IIL source 20,
The 22nd contact is connected to the detection circuit 21.

第３接点はブランクである。The third contact is blank.

この切替回路１６と励磁電源２０および検出回路２１は
同一の盤に収納されており、また検出回路２１の出力は
液位表示用の指示針２２と、警報用の警報設定器２６に
接続されている。This switching circuit 16, excitation power source 20, and detection circuit 21 are housed in the same panel, and the output of the detection circuit 21 is connected to an indicator 22 for liquid level display and an alarm setting device 26 for alarm. There is.

第６図は１個のコイル（例えば１０）と切替スイッチ（
例えば１７）のみを取り出して示すもので、コイル１０
は切替スイッチ１７内の端子２４゜２５に接続され、切
替スイッチ１７の励磁用端子２４ｍ　、２５ｍは励磁電
源２０に、検出用端子２４ｂ。Figure 6 shows one coil (for example 10) and a selector switch (
For example, only coil 17) is shown.
are connected to the terminals 24 and 25 in the changeover switch 17, and the excitation terminals 24m and 25m of the changeover switch 17 are connected to the excitation power supply 20, and the detection terminal 24b.

２５ｂ　　は検出回路２１に接続されている。25b is connected to the detection circuit 21.

また、あき端子２４ｅ　、２５ｃは、コイル１０を励磁
用にも、検出用にも用いないときに使用される。Further, the open terminals 24e and 25c are used when the coil 10 is not used for excitation or detection.

上述のように構成した本発明の誘導型液面針において、
３つのコイル１０，１１．１２は同一ボビンに、特性が
同じになるよう巻装されており、したがって、どのコイ
ルが励磁用コイルとして用いられようとも、あるいは検
出用コイルとして用いられようとも、同じ出力信号が得
られるようになっている。In the guided liquid level needle of the present invention configured as described above,
The three coils 10, 11, and 12 are wound on the same bobbin so that they have the same characteristics, so no matter which coil is used as the excitation coil or the detection coil, they have the same characteristics. An output signal is now available.

ｆ例えば、弔１のコイル１ｏを励磁用に、第２のｊイル
１１を検出用に使用する場合には、切替回路１６を第２
図の状態に接続すれば、第１のコイル１０には励磁電源
２０が接続されて励磁コイルとなり、第２のコイル１１
には検出回路２１が接続されて検出コイルとなる。For example, when using the coil 1o of the coil 1 for excitation and the second coil 11 for detection, the switching circuit 16 is
When connected in the state shown in the figure, the first coil 10 is connected to the excitation power source 20 and becomes an excitation coil, and the second coil 11
A detection circuit 21 is connected to the detection coil 21 to serve as a detection coil.

この場合、第３のコイル１２はあきコイルとなる。In this case, the third coil 12 becomes an open coil.

その結果、第ｌのコイル１ｏと第２のコイル１１によっ
て連続式液面針が構成されることになる。As a result, the first coil 1o and the second coil 11 constitute a continuous liquid level needle.

この状態で、例えば第１のコイル１０又は、そのリード
線を形成するＭＩケーブルに絶縁劣化や断線が生じた場
合は、切替回路１６の第１のコイル用切替スイッチ１７
をあき端子側に切り替え、第３のコイル用切替スイッチ
１９を励磁用に切換えれば、第３のコイル１２が励磁コ
イルとなり、第３のコイル１２と第２のコイル１１とに
よって　　　１連続式液面計が構成されることになる。In this state, for example, if insulation deterioration or disconnection occurs in the first coil 10 or the MI cable forming its lead wire, the first coil changeover switch 17 of the changeover circuit 16
If the switch is switched to the open terminal side and the third coil selector switch 19 is switched to excitation, the third coil 12 becomes an excitation coil, and the third coil 12 and second coil 11 operate one continuous liquid. A face meter will be constructed.

従って、３つのコイルを交互に機能を切替えること≦二
より、ｓｃ＊　”　３通りの液面針としての組合せが”
Ｔ能となり、それぞれ３つの液面計の出力を比較し音う
ことにより、液面針の健全性の相互チェックを行なうこ
ともできる。Therefore, since the functions of the three coils are alternately switched ≦2, there are three possible combinations for the liquid level needle.
The soundness of the liquid level needles can also be mutually checked by comparing the outputs of the three liquid level gauges and making a sound.

本発明は第４図に例示するように変形して実施すること
もできる。The present invention can also be modified and implemented as illustrated in FIG.

この斐形例は第２図における切替回路１６のあき端子に
信号処理回路２６を接続し、その出力を湿度補償回路２
７を介して指示計２２にインプットするよう構成し７た
もので、第３のコイル１２は温度補償コイルとして使用
される。In this example, a signal processing circuit 26 is connected to the open terminal of the switching circuit 16 in FIG.
The third coil 12 is used as a temperature compensation coil.

この場合、第３のコイル１２に生じた出力の温度変化分
を信号処理回路２６によって取出し、温度補償回路２７
によって検出回路２１からの信号に温度補償妄す１】え
た後、指示計２２に表示するので、炉内の雰囲気温度が
変化しても、その影響によって誤差を生ずることがなく
、高い精噴で液位な検出表示することができる。In this case, the temperature change in the output generated in the third coil 12 is extracted by the signal processing circuit 26, and the temperature compensation circuit 27
After temperature compensation is applied to the signal from the detection circuit 21, it is displayed on the indicator 22, so even if the atmospheric temperature inside the furnace changes, there will be no error due to its influence, and high ejection can be achieved. The liquid level can be detected and displayed.

なお、本発明においては液面計センサな４いに結合する
４個またはそれ以−ヒのコイルで構成するようにしても
よい。In the present invention, the liquid level gauge sensor may be constructed of four or more coils connected to each other.

〔発明の効果〕〔Effect of the invention〕

以Ｆ説明したように、本発明によれば、コイルまた番′
より一ド線の１個が故障した場合には切替用スイッチの
切替で新たな液面針が構成されるので、故障液ｔｈ＋１
の交換をしなくとも液面監視を継続でき、従って故障液
面針の交換のためにプラントを体重する必要もなくなる
。As explained below, according to the present invention, the coil or the
If one of the twisted wires fails, a new liquid level needle is configured by switching the changeover switch, so the faulty liquid th+1
Liquid level monitoring can be continued without the need to replace the liquid level needle, and therefore there is no need to increase the plant weight to replace a failed liquid level needle.

また、１個の液面針の中で、出力の相、互チェックも可
能となり、液面計の健全性を常時確認することもでさる
。It is also possible to mutually check the outputs within one liquid level needle, making it possible to constantly check the health of the liquid level gauge.

また史に予備のコイルを温度補償コイルとすることによ
り、温度補償を行なうことも可能である。Furthermore, it is also possible to perform temperature compensation by using a spare coil as a temperature compensation coil.

従って、本発明によれば、液面計の信頼性が向、にし、
プラントの稼動率も向トする。Therefore, according to the present invention, the reliability of the level gauge is improved;
Plant operation rates will also improve.

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

第１図は従来の誘導型液面針を示す回路図、第２図は本
発明の誘導型液面針の実施例を示す回路図、弔６図は第
２図における切替回路の一部を拡大して示す回路図、第
４図は本発明の他の実施例な示す回路図である。 １．２０　　・・・・・・　励磁電源 ２，１６　　・・・・・・　コネクタ ６　・・・・・・・・・・・・　励磁コイル４　・・・
・・・・・・・・　検出コイル５．２１　　・・・・・
・　検出回路 ６．２２　　・・・・・・　指示針 ７．９　　・・・・・・　液面針センサ８．１４　　・
・・・・・　ケーブル １０　　・・・・・・・・・・・・第１のコイル１１　
　・・・・・・・・・・・・　第２のコイル１２　　・
・・・・・・・・・・・　第３のコイル１６　　・・・
・・・・・・・・・　切替回路１７．１８．１９・・・
　切替スイッチ２６　　・・・・・・・・・・−・　警
報設定器２４　、２５　　・・・・・・　端子 ２６　　・・・・・・・・・・・・　信号処理回路２７
　　・・・・・・・・・・・・　温度補償回路（７３１
７）　　代理人弁理士　則　近　憲　佑（ほか１名）Figure 1 is a circuit diagram showing a conventional induction type liquid level needle, Figure 2 is a circuit diagram showing an embodiment of the induction type liquid level needle of the present invention, and Figure 6 shows a part of the switching circuit in Figure 2. FIG. 4 is an enlarged circuit diagram showing another embodiment of the present invention. 1.20 ...... Excitation power supply 2, 16 ...... Connector 6 ...... Excitation coil 4 ...
...... Detection coil 5.21 ...
・ Detection circuit 6.22 ・・ Indicator needle 7.9 ・・ Liquid level needle sensor 8.14 ・
...... Cable 10 ...... First coil 11
...... Second coil 12 ・
......Third coil 16...
...... Switching circuit 17.18.19...
Selector switch 26 ......... Alarm setter 24 , 25 ...... Terminal 26 ...... Signal processing circuit 27
・・・・・・・・・・・・ Temperature compensation circuit (731
7) Representative Patent Attorney Noriyuki Chika (and 1 other person)

Claims (1)

【特許請求の範囲】 １、導電性液体の液位な検出する誘導型液面針において
、液面センサが互いに結合する３個以上のコイルを具備
しており、これらのコイルからのリード線と、励磁電源
および検出回路との間に介挿した切替回路により、前記
３個以上のコイルのうちの任意の１個を励磁コイルとし
、他の１個を検出コイルとして切替えることができるよ
う構成したことを特徴とする誘導型液面針。 ２、切替回路が３点接点を備えた３個の切替スイッチか
ら構成されており、第１接点には励磁電源が接続され、
第２接点には検出回路が接続され、Ｉ８３８点接ブラン
クとされていることを特徴とする特許請求の範囲第１項
に記載の誘導型液面針。 ３、切替回路が３点接点を備えた３個の切替スイッチか
ら構成されており、第１接点には励磁電源が接続され、
第２接点には検出回路が接続され、第３接点には４８号
処理回路を介して温度補償回路が接続されていることを
特徴とする特許請求の範囲１１項に記載の誘導型液面針
。 ４、温度補償回路が検出回路と指示針の間に介挿されて
いることを特徴とする特許請求の範囲第６項に記載の誘
導型液面計。[Claims] 1. In an inductive liquid level needle for detecting the liquid level of a conductive liquid, the liquid level sensor is provided with three or more coils coupled to each other, and the lead wires from these coils and , a switching circuit inserted between the excitation power source and the detection circuit is configured such that any one of the three or more coils can be switched as the excitation coil and the other one as the detection coil. An inductive liquid level needle characterized by: 2. The switching circuit is composed of three changeover switches with three-point contacts, and the excitation power source is connected to the first contact.
2. The induction type liquid level needle according to claim 1, wherein a detection circuit is connected to the second contact, and the second contact is an I838 point contact blank. 3. The switching circuit is composed of three switches with three-point contacts, and the excitation power source is connected to the first contact.
The inductive liquid level needle according to claim 11, wherein a detection circuit is connected to the second contact, and a temperature compensation circuit is connected to the third contact via a processing circuit No. 48. . 4. The induction type liquid level gauge according to claim 6, characterized in that a temperature compensation circuit is interposed between the detection circuit and the indicator needle.
JP7336482A 1982-05-04 1982-05-04 Induction type level gauge Pending JPS58191929A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7336482A JPS58191929A (en) 1982-05-04 1982-05-04 Induction type level gauge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7336482A JPS58191929A (en) 1982-05-04 1982-05-04 Induction type level gauge

Publications (1)

Publication Number Publication Date
JPS58191929A true JPS58191929A (en) 1983-11-09

Family

ID=13516041

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7336482A Pending JPS58191929A (en) 1982-05-04 1982-05-04 Induction type level gauge

Country Status (1)

Country Link
JP (1) JPS58191929A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6468623A (en) * 1987-09-09 1989-03-14 Mitsubishi Heavy Ind Ltd Induction type liquid level detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6468623A (en) * 1987-09-09 1989-03-14 Mitsubishi Heavy Ind Ltd Induction type liquid level detector

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