JPH06331422A - Level switch - Google Patents
Level switchInfo
- Publication number
- JPH06331422A JPH06331422A JP5118145A JP11814593A JPH06331422A JP H06331422 A JPH06331422 A JP H06331422A JP 5118145 A JP5118145 A JP 5118145A JP 11814593 A JP11814593 A JP 11814593A JP H06331422 A JPH06331422 A JP H06331422A
- Authority
- JP
- Japan
- Prior art keywords
- float
- water
- stopper
- coil spring
- switch
- 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
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Level Indicators Using A Float (AREA)
- Examining Or Testing Airtightness (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は水位検出器に係り、特
に、沸騰水型原子炉に適用して使用時の健全性の維持を
図るのに好適な水位検出器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water level detector, and more particularly to a water level detector suitable for application to a boiling water reactor to maintain soundness during use.
【０００２】[0002]
【従来の技術】沸騰水型原子炉の制御棒駆動水圧系は制
御棒駆動水ポンプ，水圧制御ユニット，挿入，引抜配
管，圧力並びに流量調節弁及び検出器計測器等から構成
され、制御棒駆動機構の作動に必要な圧力と流量を制御
し、これを制御棒駆動機構に供給する系統でその基本系
統を図１に示す。2. Description of the Related Art A control rod drive hydraulic system of a boiling water reactor is composed of a control rod drive water pump, a water pressure control unit, an insertion / extraction pipe, a pressure and flow rate control valve, a detector measuring instrument, etc. The basic system of the system that controls the pressure and flow rate required for the operation of the mechanism and supplies this to the control rod drive mechanism is shown in FIG.
【０００３】制御棒の動作にはあらかじめ計画されたパ
ターンによる定常挿入及び引抜きと原子力発電プラント
の異常時の緊急挿入（スクラム）、すなわち、非常定挿
入とがある。The operation of the control rod includes steady insertion and withdrawal according to a preset pattern, and emergency insertion (scrum) when the nuclear power plant is abnormal, that is, emergency constant insertion.
【０００４】定常挿入及び引抜きは本発明に関係しない
ため説明は省略する。非定常挿入、すなわち、スクラム
時は水圧制御ユニットに組み込まれたピストンタイプア
キュムレータからの水圧で駆動される。従来の沸騰水型
原子炉用制御棒駆動水圧システムにおいて、Ｎ2 容器に
Ｎ2 ガスが約１３０kg／cm2 で封入され、アキュムレー
タ連結管によりピストンタイプアキュムレータのＮ2 ガ
ス室に接続されてピストンで仕切られた水室内のスクラ
ム駆動水を加圧している。定常状態では入口スクラム弁
及び逆止弁が閉じており、水室内の圧力はＮ2 ガス圧と
バランス状態にある。Steady insertion and withdrawal are not related to the present invention, and a description thereof will be omitted. During non-steady insertion, that is, during scram, it is driven by water pressure from a piston type accumulator incorporated in the water pressure control unit. In a conventional boiling water reactor control rod drive water pressure system, N 2 gas is sealed at about 130 kg / cm 2 in an N 2 container, and is connected to the N 2 gas chamber of a piston type accumulator by an accumulator connecting pipe and connected by a piston. The scram drive water in the partitioned water chamber is pressurized. In the steady state, the inlet scrum valve and the check valve are closed, and the pressure in the water chamber is in balance with the N 2 gas pressure.
【０００５】アキュムレータのＮ2 ガス室内圧力が上昇
したり下降するとスクラム機能に異常をきたすため検出
器を設けている。検出器は圧力の監視のため圧力スイッ
チを、水漏れ監視のためレベルスイッチをアキュムレー
タ連結管部に設けているレベルスイッチの構造を図２に
示す。レベルスイッチ２８は本体５０の中央円筒部の中
にリードスイッチ５１を有し、リードスイッチ５１はリ
ード線５５を介してコネクタ５６に接続し、コネクタ５
６は図示していない外部ケーブルを介し制御盤に接続さ
れる。円筒部の外側にはマグネット５２を内蔵したプラ
スチック製のフロート５３がある。フロート５３の下端
内側には直径約０.３mm の細いコイルばね５４がありそ
の下側にはストッパ５８がねじ５９で本体５０に固定さ
れている。系内に水が溜ればフロート５３は水による浮
力とコイルばね５４の揚力で浮き上がりフロート５３に
内蔵されたマグネット５２がリードスイッチ５１を動作
させ警報として信号を発する。A detector is provided because the scrum function becomes abnormal when the pressure in the N 2 gas chamber of the accumulator rises or falls. FIG. 2 shows the structure of the level switch in which the detector is provided with a pressure switch for monitoring pressure and a level switch for monitoring water leakage in the accumulator connecting pipe section. The level switch 28 has a reed switch 51 in the central cylindrical portion of the main body 50, and the reed switch 51 is connected to a connector 56 via a lead wire 55.
6 is connected to the control panel via an external cable (not shown). On the outside of the cylindrical portion, there is a plastic float 53 containing a magnet 52. Inside the lower end of the float 53 is a thin coil spring 54 having a diameter of about 0.3 mm, and a stopper 58 is fixed to the main body 50 with a screw 59 below the coil spring 54. When water is accumulated in the system, the float 53 is lifted by the buoyancy of water and the lift of the coil spring 54, and the magnet 52 built in the float 53 operates the reed switch 51 to issue a signal as an alarm.
【０００６】[0006]
【発明が解決しようとする課題】定期検査等でアキュム
レータや検出器計測器等の点検のため、Ｎ2 ガスは排気
及び充填されるが、図２に示すとおりレベルスイッチ部
のガス通路７０，７１は狭く、ガス圧力は高いため排気
は高速流となる。そのため、フロート５３は高速流のガ
スにより回転しコイルバネ５４も共に回転するがコイル
ばね５４の径は細いため上側のみが回転し、捩れた状態
となる。この状態はフロート５３が浮き上がった状態の
ため制御棒駆動水圧系の運転を再開すると水がないのに
「水位高」の警報を発し、再度、ガスを排気してレベル
スイッチを分解点検することになり工程上への影響や作
業員の被曝線量増加等につながり好ましくなかった。こ
の対策として従来は図１に示す弁２９の開度調整や閉止
栓３１部へオリフィスを取付けて排気及び充填時の流速
を制限してコイルばね５４の捩れ防止を図っていた。本
発明の目的はガスの排気及び充填時に、フロート５３が
回転しコイルばね５４が捩れることなく運転再開できる
レベルスイッチを提供することにある。The N 2 gas is exhausted and filled for the inspection of accumulators, detectors, measuring instruments, etc. in the periodic inspection and the like, but as shown in FIG. Is narrow and the gas pressure is high, resulting in a high-speed exhaust. Therefore, the float 53 is rotated by the high-speed gas and the coil spring 54 is also rotated, but since the diameter of the coil spring 54 is small, only the upper side is rotated and the coil 53 is twisted. In this state, the float 53 is in a floating state. When the control rod drive water pressure system is restarted, a "high water level" alarm will be issued even though there is no water, and gas will be exhausted again and the level switch will be disassembled for inspection. It was not preferable because it had an adverse effect on the process and increased the radiation dose to workers. As a countermeasure against this, conventionally, the opening of the valve 29 shown in FIG. 1 is adjusted and an orifice is attached to the closing plug 31 to limit the flow velocity at the time of exhaust and filling to prevent the coil spring 54 from twisting. An object of the present invention is to provide a level switch capable of resuming operation without rotating the float 53 and twisting the coil spring 54 at the time of exhausting and filling gas.
【０００７】[0007]
【課題を解決するための手段】上記の目的は、フロート
の外周にストッパと一体化したプロテクタを設け、なお
かつフロートの回転防止を図るストッパを設けることに
より達成できる。The above object can be achieved by providing a protector integrated with a stopper on the outer periphery of the float and also providing a stopper for preventing the rotation of the float.
【０００８】[0008]
【作用】フロートの下部外側を薄い円筒状のプロテクタ
で囲い充填時、周囲を通るＮ2ガスと隔離する。Ｎ2 ガ
スの排気時は回転防止用ストッパによりフロートの回転
を防止する。水が漏れて溜った時はプロテクタ底部に設
けた穴からフロート側に水が浸入し、フロートを浮き上
がらせる。The outer bottom of the float is surrounded by a thin cylindrical protector to isolate it from the N 2 gas passing through it. When exhausting N 2 gas, the rotation prevention stopper prevents the rotation of the float. When water leaks and collects, water penetrates into the float side through the hole provided in the bottom of the protector and lifts the float.
【０００９】[0009]
【実施例】図３は本発明による一実施例である。レベル
スイッチ２８は本体５０の中央円筒部の中にリードスイ
ッチ５１を有し、リードスイッチ５１はリード線５５を
介してコネクタ５６に接続し、コネクタ５６は図示して
いない外部ケーブルを介して制御盤に接続される。円筒
部の外側にはマグネット５２を内蔵したプラスチック製
のフロート５３がある。フロート５３の下端内側には直
径約０.３mm の細いコイルばね５４がありその外側には
ストッパと一体化したプロテクタ６１がねじ６２で本体
５０に固定されている。フロート５３の外側にはフロー
ト回転防止用ストッパを受け入れる切欠き部を設けてい
る。プロテクタ６１の底部には適当数の通水孔６３が明
けられている。アキュムレータのシール部から水漏れし
た場合、系統内に水が溜まり水は通水孔６３を通ってフ
ロート５３を押し上げる。フロート５３は水による浮力
とコイルばね５４の揚力で浮き上がる。フロート５３内
にはマグネット５２を内蔵しておりこのマグネット５２
によりリードスイッチ５１を動作させ警報として信号を
発する。FIG. 3 shows an embodiment according to the present invention. The level switch 28 has a reed switch 51 in the central cylindrical portion of the main body 50, the reed switch 51 is connected to a connector 56 via a lead wire 55, and the connector 56 is a control panel via an external cable (not shown). Connected to. On the outside of the cylindrical portion, there is a plastic float 53 containing a magnet 52. A thin coil spring 54 having a diameter of about 0.3 mm is provided inside the lower end of the float 53, and a protector 61 integrated with a stopper is fixed to the body 50 with a screw 62 on the outside thereof. A notch is provided on the outside of the float 53 to receive the float rotation preventing stopper. An appropriate number of water passage holes 63 are formed in the bottom of the protector 61. When water leaks from the seal portion of the accumulator, water is accumulated in the system and the water pushes up the float 53 through the water passage hole 63. The float 53 floats due to the buoyancy of water and the lift of the coil spring 54. A magnet 52 is built in the float 53, and the magnet 52
Then, the reed switch 51 is operated to issue a signal as an alarm.
【００１０】Ｎ2 ガスの充填時、フロートは下部外側を
プロテクタで囲われているためフロートとガスは直接接
することがなくフロートの回転は防止できる。また、Ｎ
2 ガスの排気時には排気ガスは直接フロートに当るがフ
ロートに回転力が働いてもフロート回転防止用ストッパ
によりフロートの回転を防止することができる。When the N 2 gas is filled, the float is surrounded by a protector on the lower outer side, so that the float and the gas are not in direct contact with each other and rotation of the float can be prevented. Also, N
When the two gases are exhausted, the exhaust gas directly hits the float, but even if rotational force acts on the float, the float rotation prevention stopper can prevent the rotation of the float.
【００１１】図４も本発明による一実施例である。フロ
ート６４下端側にはストッパと一体化したプロテクタ６
５がねじ６２で本体５０に固定されている。フロート６
４内部にフロート回転防止用ピンの入る穴を有しストッ
パに埋め込まれたピン６６により排気ガスによるフロー
ト６４の回転を防止する。FIG. 4 is also an embodiment according to the present invention. A protector 6 integrated with a stopper is provided on the lower end side of the float 64.
5 is fixed to the main body 50 with screws 62. Float 6
The rotation of the float 64 due to the exhaust gas is prevented by the pin 66 embedded in the stopper having a hole for receiving the float rotation prevention pin inside.
【００１２】[0012]
【発明の効果】本発明によればレベルスイッチ本体の構
造及びレベルスイッチ取付部を変更すること無くストッ
パと一体構造のプロテクタを追加することでコイルばね
の捩れ防止を図ることができる。According to the present invention, the twist of the coil spring can be prevented by adding a protector integrated with the stopper without changing the structure of the level switch body and the level switch mounting portion.
【図１】制御棒駆動水圧系の系統図。FIG. 1 is a system diagram of a control rod drive hydraulic system.
【図２】従来技術によるレベルスイッチの断面図。FIG. 2 is a cross-sectional view of a conventional level switch.
【図３】本発明によるレベルスイッチの断面図。FIG. 3 is a sectional view of a level switch according to the present invention.
【図４】本発明によるレベルスイッチの断面図。FIG. 4 is a sectional view of a level switch according to the present invention.
１…原子炉圧力容器、２…制御棒駆動機構、３…制御棒
駆動水ポンプ、７…挿入側配管、８…引抜側配管、９…
スクラム排出容器、１０…水圧制御ユニット、１１…定
常挿入及び引抜き操作部、１２…アキュムレータ、１３
…Ｎ2 容器、１４…アキュムレータ連結管、１５…Ｎ2
ガス、１６…Ｎ2 ガス室、１７…水室、１８…ピスト
ン、１９〜２０…出入口スクラム弁、２１…流量調節
弁、２２…圧力調節弁、２３〜２６…逆止弁、２７…ス
クラム排出ヘッダー、３０…圧力スイッチ、５７…締付
けナット、６０…Ｏリング、７２…充填時ガスの流れ方
向、７３…排出時ガスの流れ方向。DESCRIPTION OF SYMBOLS 1 ... Reactor pressure vessel, 2 ... Control rod drive mechanism, 3 ... Control rod drive water pump, 7 ... Insertion side piping, 8 ... Extraction side piping, 9 ...
Scrum discharge container, 10 ... Water pressure control unit, 11 ... Steady insertion and extraction operation section, 12 ... Accumulator, 13
... N 2 container, 14 ... accumulator connecting pipe, 15 ... N 2
Gas, 16 ... N 2 gas chamber, 17 ... Water chamber, 18 ... Piston, 19-20 ... Inlet / outlet scram valve, 21 ... Flow control valve, 22 ... Pressure control valve, 23-26 ... Check valve, 27 ... Scrum discharge Header, 30 ... Pressure switch, 57 ... Tightening nut, 60 ... O-ring, 72 ... Gas flow direction during filling, 73 ... Gas flow direction during discharging.
Claims (1)
て、スクラムアキュムレータ用のアキュムレータピスト
ン部水漏れ検出器にフロート回転防止装置を設けたこと
を特徴とする水位検出器。1. A water level detector in a control rod drive water pressure system of a boiling water reactor, wherein a float rotation preventing device is provided in an accumulator piston water leak detector for a scrum accumulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5118145A JPH06331422A (en) | 1993-05-20 | 1993-05-20 | Level switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5118145A JPH06331422A (en) | 1993-05-20 | 1993-05-20 | Level switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06331422A true JPH06331422A (en) | 1994-12-02 |
Family
ID=14729195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5118145A Pending JPH06331422A (en) | 1993-05-20 | 1993-05-20 | Level switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06331422A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100386606C (en) * | 2005-07-18 | 2008-05-07 | 杨尚明 | Electromagnetic type bin level meter |
| CN112098123A (en) * | 2020-08-28 | 2020-12-18 | 清华大学 | Hydraulic cylinder performance measuring method of driving mechanism |
-
1993
- 1993-05-20 JP JP5118145A patent/JPH06331422A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100386606C (en) * | 2005-07-18 | 2008-05-07 | 杨尚明 | Electromagnetic type bin level meter |
| CN112098123A (en) * | 2020-08-28 | 2020-12-18 | 清华大学 | Hydraulic cylinder performance measuring method of driving mechanism |
| CN112098123B (en) * | 2020-08-28 | 2021-11-09 | 清华大学 | Hydraulic cylinder performance measuring method of driving mechanism |
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