JP4294580B2 - Control rod drive mechanism - Google Patents

Control rod drive mechanism Download PDF

Info

Publication number
JP4294580B2
JP4294580B2 JP2004373648A JP2004373648A JP4294580B2 JP 4294580 B2 JP4294580 B2 JP 4294580B2 JP 2004373648 A JP2004373648 A JP 2004373648A JP 2004373648 A JP2004373648 A JP 2004373648A JP 4294580 B2 JP4294580 B2 JP 4294580B2
Authority
JP
Japan
Prior art keywords
magnetic coupling
control rod
yoke
drive mechanism
coupling element
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.)
Active
Application number
JP2004373648A
Other languages
Japanese (ja)
Other versions
JP2006177882A (en
Inventor
芳浩 家中
宏一 赤塚
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.)
Hitachi GE Nuclear Energy Ltd
Original Assignee
Hitachi GE Nuclear Energy 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 Hitachi GE Nuclear Energy Ltd filed Critical Hitachi GE Nuclear Energy Ltd
Priority to JP2004373648A priority Critical patent/JP4294580B2/en
Publication of JP2006177882A publication Critical patent/JP2006177882A/en
Application granted granted Critical
Publication of JP4294580B2 publication Critical patent/JP4294580B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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

  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)

Description

本発明は、原子力プラントに使用する制御棒駆動機構に係わり、さらに詳しくは、対向配置された一対の磁気継手要素を介し電動機の回転トルクを伝達して制御棒を駆動する制御棒駆動機構に関する。   The present invention relates to a control rod drive mechanism used in a nuclear power plant, and more particularly to a control rod drive mechanism that drives a control rod by transmitting rotational torque of an electric motor through a pair of opposed magnetic coupling elements.

一般に、沸騰水型原子炉（ＢＷＲ）の圧力容器には、減速材を兼ねた冷却材が収容されるとともに、原子炉圧力容器の中央部には多くの燃料集合体が装荷された炉心が配置される。燃料集合体の間には制御棒（ＣＲ）が挿入・引抜自在に設置されており、原子炉の起動・停止、反応度補償、負荷追従等の制御は、炉心に対し制御棒を挿入・引抜することにより行われる。この制御棒は、原子炉圧力容器の下部に備わる制御棒駆動機構（ＣＲＤ）によって昇降駆動される。   In general, the pressure vessel of a boiling water reactor (BWR) contains a coolant that also serves as a moderator, and a core loaded with a large number of fuel assemblies is placed in the center of the reactor pressure vessel. Is done. Control rods (CR) are installed between the fuel assemblies so that they can be inserted and removed. Controls such as reactor start / stop, reactivity compensation, and load follow-up are inserted and removed from the reactor core. Is done. The control rod is driven up and down by a control rod drive mechanism (CRD) provided in the lower part of the reactor pressure vessel.

制御棒駆動機構は、原子炉圧力容器の下部に接続したハウジング内において、制御棒の下端に連結された中空ピストンをボールねじに螺合されたボールナット上に載置するよう構成されており、ボールねじを回転させボールナットを上下動させて制御棒を昇降駆動するようになっている。   The control rod drive mechanism is configured to place a hollow piston coupled to the lower end of the control rod on a ball nut screwed into a ball screw in a housing connected to the lower part of the reactor pressure vessel, The control rod is driven up and down by rotating the ball screw and moving the ball nut up and down.

また従来、ハウジングを挟んで対向配置された一対の磁気継手要素を設け、ハウジング外側の磁気継手要素は電動機の出力軸に連結し、ハウジング内側の磁気継手要素はボールねじへと連結した構造が開示されており（例えば、特許文献１参照）、一対の磁気継手要素の間で作用する磁力を用いて電動機の回転トルクを伝達し、ボールねじを回転させるようになっている。なお、磁気継手要素は、全体として筒状筐体内に磁石を密封収容した構成としている。   Conventionally, a structure is disclosed in which a pair of magnetic coupling elements arranged opposite to each other with a housing interposed therebetween are provided, the magnetic coupling elements on the outside of the housing are connected to the output shaft of the motor, and the magnetic coupling elements on the inside of the housing are connected to a ball screw. (For example, refer to Patent Document 1), the rotational torque of the electric motor is transmitted using the magnetic force acting between the pair of magnetic coupling elements, and the ball screw is rotated. The magnetic coupling element has a configuration in which a magnet is hermetically housed in a cylindrical housing as a whole.

特開２００２−１４１８９号公報（第５図及び第９図）JP 2002-14189 A (FIGS. 5 and 9)

しかしながら、上記従来技術には以下のような改善の余地があった。
すなわち、上記従来の外側磁気継手要素は、図示から明確なように、ヨークの内周側に磁石とほぼ同じ深さ寸法の複数の溝部が形成され、それら溝部に複数の磁石がそれぞれ挿嵌され磁着している。そのため、各磁石の内径側磁極とその側方に隣接するヨークの段差部（言い換えれば、磁性体）との間で磁束が生じ、そのぶんだけ内側磁気継手要素への磁束が減少していた。したがって、対向配置された一対の磁気継手要素の間で作用する磁力、すなわちトルク伝達の面で改善の余地があった。 However, the above prior art has room for improvement as follows.
That is, in the conventional outer magnetic coupling element, as is clear from the drawing, a plurality of groove portions having substantially the same depth as the magnet are formed on the inner peripheral side of the yoke, and the plurality of magnets are respectively inserted into the groove portions. It is magnetically attached. For this reason, a magnetic flux is generated between the inner diameter side magnetic pole of each magnet and a step portion (in other words, a magnetic body) adjacent to the side of the magnet, and the magnetic flux to the inner magnetic coupling element is reduced accordingly. Therefore, there is room for improvement in terms of the magnetic force acting between the pair of magnetic coupling elements arranged opposite to each other, that is, in terms of torque transmission.

本発明の目的は、対向配置された一対の磁気継手要素の間で作用する磁力を増加し、トルク伝達を向上させることができる制御棒駆動機構を提供することにある。   An object of the present invention is to provide a control rod drive mechanism that can increase the magnetic force acting between a pair of opposing magnetic coupling elements and improve torque transmission.

（１）上記目的を達成するために、本発明は、対向配置された一対の磁気継手要素を介し電動機の回転トルクを伝達して制御棒を駆動する制御棒駆動機構において、前記一対の磁気継手要素のうち少なくとも一の磁気継手要素は、一方側に複数の溝部が形成されたヨークと、前記ヨークの溝部にそれぞれ挿嵌され磁着した複数の磁石とを備え、前記ヨークにおける前記磁石間の段差部の高さ方向寸法を零より大きく且つ前記磁石の高さ方向寸法の半分以下となるように形成し、前記磁石間に位置するように前記ヨーク段差部の高さ方向側に非磁性体を配設する。 (1) In order to achieve the above object, the present invention provides a control rod driving mechanism for driving a control rod by transmitting rotational torque of an electric motor through a pair of opposing magnetic coupling elements. at least one magnetic coupling element of the element, whereas comprises a yoke having a plurality of grooves are formed on the side, and a plurality of magnets magnetically attached is inserted respectively into the groove of the yoke, between said magnets in said yoke The height of the step is larger than zero and less than half of the height of the magnet, and the non-magnetic material is formed on the height of the yoke step so as to be positioned between the magnets. Is disposed .

（２）上記（１）において、好ましくは、前記非磁性体は、前記ヨーク及び前記磁石に接着する接着剤である。 ( 2 ) In the above ( 1 ), preferably, the non-magnetic material is an adhesive that adheres to the yoke and the magnet.

本発明によれば、対向配置された一対の磁気継手要素の間で作用する磁力を増加し、トルク伝達を向上させることができる。   According to the present invention, it is possible to increase the magnetic force acting between a pair of opposing magnetic coupling elements and improve torque transmission.

以下、本発明の実施形態を、図面を参照しつつ説明する。   Embodiments of the present invention will be described below with reference to the drawings.

本発明の参考例を図１〜図６により説明する。
図２は、本発明の適用対象である原子炉圧力容器の一部断面図であり、図３は、本発明の制御棒駆動機構の参考例の全体構成を表す縦断面図である。 A reference example of the present invention will be described with reference to FIGS.
FIG. 2 is a partial cross-sectional view of a reactor pressure vessel to which the present invention is applied , and FIG. 3 is a vertical cross-sectional view illustrating the entire configuration of a reference example of a control rod drive mechanism of the present invention.

これら図２及び図３において、原子炉圧力容器１は、内部に減速材を兼ねた冷却材を収容するとともに、その中央部に多数の燃料集合体が装荷された炉心が配置されている。制御棒（ＣＲ）２は、それら燃料集合体の間に挿入及び引抜自在に設置され、原子炉圧力容器１の下鏡部に貫通して設けた制御棒駆動機構（ＣＲＤ）３によって昇降駆動されるようになっている。制御棒駆動機構３は、原子炉の反応度制御を目的として、制御棒２と一体的に構成され、原子力プラントの運転及び安全上の重要性が特に高いものである。   2 and 3, the reactor pressure vessel 1 accommodates therein a coolant that also serves as a moderator, and a core loaded with a large number of fuel assemblies is disposed at the center thereof. The control rod (CR) 2 is installed between the fuel assemblies so as to be freely inserted and withdrawn, and is driven up and down by a control rod drive mechanism (CRD) 3 provided through the lower mirror portion of the reactor pressure vessel 1. It has become so. The control rod drive mechanism 3 is configured integrally with the control rod 2 for the purpose of controlling the reactivity of the nuclear reactor, and has particularly high importance in the operation and safety of the nuclear power plant.

制御棒駆動機構３のハウジングは、原子炉圧力容器１の下鏡部に接続されたハウジング４と、このハウジング４の下部フランジにアウタチューブ５を介しボルト締結され、一次冷却水の隔壁となるスプールピース６とで構成されている。スプールピース６の下部には、制御棒駆動機構３の駆動源である電動機７が着脱可能に設けられている。   The control rod drive mechanism 3 includes a housing 4 connected to the lower mirror portion of the reactor pressure vessel 1 and a spool that is bolted to the lower flange of the housing 4 via an outer tube 5 and serves as a partition wall for primary cooling water. It consists of pieces 6. An electric motor 7 that is a drive source of the control rod drive mechanism 3 is detachably provided below the spool piece 6.

ハウジング４（及びアウタチューブ５）内には、上記制御棒２の下端にカップリング８を介し連結された中空ピストン９と、この中空ピストン９が載置されたボールナット１０と、このボールナット１０が螺合され、上端側が中空ピストン９に収容されたボールねじ１１とが設けられている。スプールピース６内には、ボールねじ１１の下端側に連結された伝達軸１２が設けられている。また、スプールピース６を挟んで対向配置された一対の磁気継手要素１３，１４が設けられており、スプールピース６の内側の磁気継手要素１３は伝達軸１２に接続され、スプールピース６の外側の磁気継手要素１４は電動機７の出力軸７ａに接続されている。   In the housing 4 (and the outer tube 5), a hollow piston 9 connected to the lower end of the control rod 2 via a coupling 8, a ball nut 10 on which the hollow piston 9 is placed, and the ball nut 10 Are screwed together, and a ball screw 11 whose upper end side is accommodated in the hollow piston 9 is provided. A transmission shaft 12 connected to the lower end side of the ball screw 11 is provided in the spool piece 6. In addition, a pair of magnetic coupling elements 13 and 14 are provided opposite to each other with the spool piece 6 interposed therebetween. The magnetic coupling element 13 on the inner side of the spool piece 6 is connected to the transmission shaft 12 and is connected to the outer side of the spool piece 6. The magnetic coupling element 14 is connected to the output shaft 7 a of the electric motor 7.

そして、電動機７が駆動すると、その出力軸７ａを介し外側磁気継手要素１４が回転し、外側磁気継手要素１４と内側磁気継手要素１３との間で作用する磁力によって回転トルクが伝達されて、内側磁気継手要素１３が回転するようになっている。これにより、内側磁気継手要素１３に接続された伝達軸１２等を介しボールねじ１１が回転し、ボールナット１０及び中空ピストン９が上下方向に移動し、それに伴い制御棒２が昇降駆動する。このようにして制御棒２の炉心への挿入・引き抜き量が調整され、炉出力が調整されるようになっている。   When the electric motor 7 is driven, the outer magnetic coupling element 14 rotates via the output shaft 7a, and the rotational torque is transmitted by the magnetic force acting between the outer magnetic coupling element 14 and the inner magnetic coupling element 13, and the inner side. The magnetic coupling element 13 rotates. As a result, the ball screw 11 rotates via the transmission shaft 12 connected to the inner magnetic coupling element 13 and the ball nut 10 and the hollow piston 9 move in the vertical direction, and the control rod 2 is driven up and down accordingly. In this way, the amount of insertion / extraction of the control rod 2 into the core is adjusted, and the reactor power is adjusted.

図４は、上記内側磁気継手要素１３の詳細構造を表す縦断面図であり、図５は、図４中断面Ｖ−Ｖによる横断面図である。   FIG. 4 is a longitudinal sectional view showing the detailed structure of the inner magnetic coupling element 13, and FIG. 5 is a transverse sectional view taken along a section V-V in FIG.

これら図４及び図５において、内側磁気継手要素１３は、全体として円筒状筐体内に磁石（永久磁石）１５を密封収容した構成としている。詳細には、上記伝達軸１２が挿通可能な円筒部１６ａ及びこの円筒部１６ａの軸方向一方側（図４中下側）外周部に設けた円環部１６ｂを有するシャフト１６と、シャフト１６の円筒部１６ａの軸方向他方側（図３中上側）外周部に接合された円環状のカラー１７と、シャフト１６の円筒部１６ａの外周側に配設されたインナーヨーク（磁性体）１８と、シャフト１６の円筒部１６ａの外周側及び対応するインナーヨーク１８の内周側にそれぞれ形成された凹部に嵌合するキー１９と、インナーヨーク１８の外周側に磁着され、磁極が互い違いとなるように配置された複数の磁石１５と、シャフト１６の円環部１６ａ及びカラー１７に溶接手段等で接合され、複数の磁石１５の外周側を被覆する円筒状のスリーブ２０とで構成されている。   4 and 5, the inner magnetic coupling element 13 has a configuration in which a magnet (permanent magnet) 15 is hermetically housed in a cylindrical housing as a whole. Specifically, a shaft 16 having a cylindrical portion 16a through which the transmission shaft 12 can be inserted and an annular portion 16b provided on an outer peripheral portion on one axial side (lower side in FIG. 4) of the cylindrical portion 16a; An annular collar 17 joined to the outer peripheral portion of the other axial side of the cylindrical portion 16a (upper side in FIG. 3), an inner yoke (magnetic body) 18 disposed on the outer peripheral side of the cylindrical portion 16a of the shaft 16, Keys 19 that fit into recesses formed on the outer peripheral side of the cylindrical portion 16a of the shaft 16 and the inner peripheral side of the corresponding inner yoke 18 are magnetically attached to the outer peripheral side of the inner yoke 18 so that the magnetic poles are staggered. And a cylindrical sleeve 20 which is joined to the annular portion 16a of the shaft 16 and the collar 17 by welding means or the like and covers the outer peripheral side of the plurality of magnets 15.

図６は、本発明の要部である上記外側磁気継手要素１４の詳細構造を表す縦断面図であり、図１は、図６中断面Ｉ−Ｉによる横断面図である。   FIG. 6 is a longitudinal sectional view showing a detailed structure of the outer magnetic coupling element 14 which is a main part of the present invention, and FIG. 1 is a transverse sectional view taken along a section II in FIG.

これら図６及び図１において、外側磁気継手要素１４は、全体として円筒状筐体内に磁石（永久磁石）２１を密封収容した構成としている。詳細には、内周側に複数の溝部２２ａが形成された略円筒状のアウタヨーク（磁性体）２２と、アウタヨーク２２の溝部２２ａにそれぞれ挿嵌され磁着した複数の磁石２１と、これら磁石２１の内周側を被覆する円筒状のスリーブ２３と、複数の磁石２１の軸方向一方側（図６中上側）端部を被覆するカラー２４と、複数の磁石２１の軸方向他方側（図６中下側）端部を被覆するとともに、上記電動機７の出力軸７ａに連結されるエンドキャップ２５と、このエンドキャップ２５の外周側及び対応するアウタヨーク２２の内周側にそれぞれ形成された凹部に嵌合するキー２６とで構成されている。なお、アウタヨーク２２は、カラー２４及びエンドキャップ２５に嵌め込み構造で接合されており、スリーブ２３は、カラー２４及びエンドキャップ２５に溶接手段等で接合されている。   6 and 1, the outer magnetic coupling element 14 has a configuration in which a magnet (permanent magnet) 21 is hermetically housed in a cylindrical housing as a whole. Specifically, a substantially cylindrical outer yoke (magnetic body) 22 having a plurality of groove portions 22 a formed on the inner peripheral side, a plurality of magnets 21 that are respectively inserted and magnetically attached to the groove portions 22 a of the outer yoke 22, and these magnets 21. A cylindrical sleeve 23 covering the inner peripheral side of the magnet, a collar 24 covering one axial end of the plurality of magnets 21 (upper side in FIG. 6), and the other axial end of the plurality of magnets 21 (FIG. 6). An end cap 25 that covers the middle and lower end and is connected to the output shaft 7a of the electric motor 7, and a recess formed on the outer peripheral side of the end cap 25 and the inner peripheral side of the corresponding outer yoke 22 respectively. It is comprised with the key 26 to fit. The outer yoke 22 is joined to the collar 24 and the end cap 25 with a fitting structure, and the sleeve 23 is joined to the collar 24 and the end cap 25 by welding means or the like.

ここで本参考例の大きな特徴として、アウタヨーク２２の溝部２２ａの深さ方向寸法（言い換えれば、磁石２１間の段差部２２ｂの高さ方向寸法）Ｌａは、磁石２１の高さ方向寸法Ｌｂの半分以下（本参考例では半分）となるように設けられている。また本参考例では、アウタヨーク２２の段差部２２ｂとスリーブ２３との間が空隙２７となっている。 Here, as a major feature of this reference example , the depth direction dimension of the groove portion 22a of the outer yoke 22 (in other words, the height direction dimension of the stepped portion 22b between the magnets 21) La is half of the height direction dimension Lb of the magnet 21. It is provided to be the following (half in this reference example ). In this reference example , a gap 27 is formed between the stepped portion 22 b of the outer yoke 22 and the sleeve 23.

次に、本参考例による作用効果を、従来構造の外側磁気継手要素を設けた場合と比較しながら以下に詳細に説明する。 Next, the operation and effect of the present reference example will be described in detail below in comparison with the case where an outer magnetic coupling element having a conventional structure is provided.

図７は、従来構造の外側磁気継手要素を表す横断面図であり、図８は、従来の外側磁気継手要素に生じる磁束を説明するための部分拡大横断面図である。なお、これら図７及び図８において、上記参考例と同等の部分には同一の符号を付し、適宜説明を省略する。また図９は、本参考例による外側磁気継手に生じる磁束を説明するための部分拡大横断面図である。 FIG. 7 is a cross-sectional view showing an outer magnetic coupling element having a conventional structure, and FIG. 8 is a partially enlarged cross-sectional view for explaining a magnetic flux generated in the conventional outer magnetic coupling element. 7 and 8, the same reference numerals are given to the same parts as those in the reference example, and the description will be omitted as appropriate. FIG. 9 is a partial enlarged cross-sectional view for explaining the magnetic flux generated in the outer magnetic coupling according to the present reference example .

図７及び図８に示すように、従来の外側磁気継手２８におけるアウタヨーク２９の溝部２９ａの深さ方向寸法（言い換えれば、磁石２１間の段差部２９ｂの高さ方向寸法）Ｌｃは、磁石２１の高さ方向寸法Ｌｂとほぼ同じとなるように設けている。そのため、各磁石２１の内径側磁極とこれに隣接するアウタヨーク２９の段差部２９ｂとの間で磁束が生じ、そのぶんだけ内側磁気継手要素１３側への磁束が減少する。   As shown in FIGS. 7 and 8, in the conventional outer magnetic coupling 28, the dimension in the depth direction of the groove portion 29 a of the outer yoke 29 (in other words, the height direction dimension of the step portion 29 b between the magnets 21) Lc is It is provided so as to be substantially the same as the height direction dimension Lb. Therefore, a magnetic flux is generated between the inner-diameter side magnetic pole of each magnet 21 and the stepped portion 29b of the outer yoke 29 adjacent thereto, and the magnetic flux toward the inner magnetic coupling element 13 is reduced accordingly.

これに対し図９に示すように、本参考例による外側磁気継手要素１４は、アウタヨーク２２の段差部２２ｂの高さ方向寸法Ｌａを磁石２１の高さ方向寸法Ｌｂの半分以下となるように設ける。これにより、アウタヨーク２２の段差部２２ｂ（言い換えれば、磁性体）が磁石２１の内径側磁極に隣接しなくなるので、各磁石２１の内径側磁極における側方への磁束が低減し、そのぶんだけ内側磁気継手要素１３への磁束を増加させることができる。したがって、対向配置された一対の磁気継手要素１３，１４の間で作用する磁力が増加し、トルク伝達を向上させることができる。また、本願発明者らは、本参考例による磁気継手要素１３，１４の伝達トルクを数値解析した結果、従来の磁気継手要素１３，２６の伝達トルクに対し約２〜３％上昇することがわかった。また、この磁気継手要素１３，１４における伝達トルクの向上により、例えば過大な回転トルクが掛けられたとき等に発生する外側磁気継手要素１４と内側磁気継手要素との間のすべり現象を抑えることができ、信頼性の向上が図れる。 On the other hand, as shown in FIG. 9, the outer magnetic coupling element 14 according to the present reference example is provided so that the height direction dimension La of the step portion 22 b of the outer yoke 22 is less than half of the height direction dimension Lb of the magnet 21. . As a result, the stepped portion 22b (in other words, the magnetic body) of the outer yoke 22 is not adjacent to the inner diameter side magnetic pole of the magnet 21, so that the magnetic flux to the side of the inner diameter side magnetic pole of each magnet 21 is reduced. The magnetic flux to the magnetic coupling element 13 can be increased. Therefore, the magnetic force which acts between a pair of magnetic coupling elements 13 and 14 arranged oppositely increases, and torque transmission can be improved. In addition, as a result of numerical analysis of the transmission torque of the magnetic coupling elements 13 and 14 according to the present reference example , the inventors of the present application have found that the transmission torque of the conventional magnetic coupling elements 13 and 26 increases by about 2 to 3%. It was. Further, by improving the transmission torque in the magnetic coupling elements 13 and 14, for example, it is possible to suppress the slip phenomenon between the outer magnetic coupling element 14 and the inner magnetic coupling element that occurs when an excessive rotational torque is applied. And reliability can be improved.

本発明の一実施形態を図１０により説明する。本実施形態は、外側磁気継手要素のアウタヨーク２２における段差部２２ａの内周側（高さ方向側）に非磁性体を配設した実施形態である。 An embodiment of the present invention will be described with reference to FIG. The present embodiment is an embodiment in which a nonmagnetic material is disposed on the inner peripheral side (height direction side) of the stepped portion 22a in the outer yoke 22 of the outer magnetic coupling element.

図１０は、本実施形態による外側磁気継手要素の詳細構造を表す横断面図である。なお、この図１０において、上記参考例と同等の部分には同一の符号を付し、適宜説明を省略する。 FIG. 10 is a cross-sectional view showing the detailed structure of the outer magnetic coupling element according to the present embodiment. In FIG. 10, the same parts as those in the reference example are given the same reference numerals, and description thereof will be omitted as appropriate.

本実施形態による外側磁気継手要素１４’は、アウタヨーク２２の段差部２２ａの内周側に非磁性体３０をそれぞれ配設する。非磁性体３０は、例えばアウタヨーク２２及び磁石２１に接着する接着剤であり、液体状態で充填され時間の経過とともに固化するようになっている。   In the outer magnetic coupling element 14 ′ according to the present embodiment, the nonmagnetic material 30 is disposed on the inner peripheral side of the stepped portion 22 a of the outer yoke 22. The non-magnetic body 30 is an adhesive that adheres to, for example, the outer yoke 22 and the magnet 21, and is filled in a liquid state and solidifies over time.

以上のように構成された本実施形態においても、上記参考例同様、対向配置された一対の磁気継手要素１３，１４’の間で作用する磁力が増加し、トルク伝達を向上させることができる。また、上記参考例のようにアウタヨーク２２の段差部２２ｂの内周側を空隙２７とした場合、周囲の熱環境により空気が熱膨張して磁石２１等を破損させる可能性が生じるが、本実施形態においてはアウタヨーク２２の段差部２２ｂの内周側に空気より熱膨張係数の小さい非磁性体３０を配設することにより、磁石２１等の破損を未然に防止することができる。また、上記参考例に比べ、非磁性体３０を配設することで磁石２１に隣接する側方面積を大きくし、磁石２１の保持力を高めることもできる。 Also in the present embodiment configured as described above, the magnetic force acting between the pair of opposed magnetic coupling elements 13 and 14 'increases as in the above reference example , and torque transmission can be improved. In addition, when the inner peripheral side of the stepped portion 22b of the outer yoke 22 is formed as the gap 27 as in the above reference example , there is a possibility that the air may thermally expand due to the surrounding thermal environment and damage the magnet 21 or the like. In the embodiment, by disposing the nonmagnetic material 30 having a smaller thermal expansion coefficient than air on the inner peripheral side of the stepped portion 22b of the outer yoke 22, damage to the magnet 21 and the like can be prevented in advance. Moreover, compared with the reference example, by increasing the lateral area adjacent to the magnet 21 by a non-magnetic member 30 is disposed, it is possible to increase the holding power of the magnet 21.

図６中断面Ｉ−Ｉによる横断面図であり、本発明の制御棒駆動機構の参考例を構成する外側磁気継手要素の詳細構造を表す。FIG. 7 is a cross-sectional view taken along section I-I in FIG. 6 and shows a detailed structure of an outer magnetic coupling element constituting a reference example of the control rod drive mechanism of the present invention. 本発明の適用対象である原子炉圧力容器の一部断面図である。1 is a partial cross-sectional view of a reactor pressure vessel to which the present invention is applied . 本発明の制御棒駆動機構の参考例の全体構成を表す縦断面図である。It is a longitudinal cross-sectional view showing the whole structure of the reference example of the control-rod drive mechanism of this invention. 本発明の制御棒駆動機構の参考例を構成する内側磁気継手要素の詳細構造を表す縦断面図である。It is a longitudinal cross-sectional view showing the detailed structure of the inner side magnetic coupling element which comprises the reference example of the control-rod drive mechanism of this invention. 図４中断面Ｖ−Ｖによる横断面図であり、本発明の制御棒駆動機構の参考例を構成する内側磁気継手要素の詳細構造を表す。FIG. 5 is a transverse sectional view taken along a section V-V in FIG. 4 and shows a detailed structure of an inner magnetic coupling element constituting a reference example of the control rod drive mechanism of the present invention. 本発明の制御棒駆動機構の参考例を構成する外側磁気継手要素の詳細構造を表す縦断面図である。It is a longitudinal cross-sectional view showing the detailed structure of the outer magnetic coupling element which comprises the reference example of the control-rod drive mechanism of this invention. 従来構造の外側磁気継手要素を表す横断面図である。It is a cross-sectional view showing the outside magnetic coupling element of a conventional structure. 従来構造の外側磁気継手要素に生じる磁力を説明するための部分拡大横断面図である。It is a partial expanded cross-sectional view for demonstrating the magnetic force which arises in the outer side magnetic coupling element of a conventional structure. 本発明の制御棒駆動機構の参考例を構成する外側磁気継手要素に生じる磁力を説明するための部分拡大横断面図である。It is a partial expanded cross-sectional view for demonstrating the magnetic force which arises in the outer magnetic coupling element which comprises the reference example of the control-rod drive mechanism of this invention. 本発明の制御棒駆動機構の一実施形態を構成する外側磁気継手要素の詳細構造を表す横断面図である。It is a cross-sectional view showing the detailed structure of the outer magnetic coupling element which comprises one Embodiment of the control-rod drive mechanism of this invention.

符号の説明Explanation of symbols

２ 制御棒
３ 制御棒駆動機構
１３ 内側磁気継手要素
１４ 外側磁気継手要素
２１ 磁石
２２ アウタヨーク
２２ａ 溝部
２２ｂ 段差部
３０ 非磁性体
Ｌａ アウタヨークの段差部の高さ方向寸法
Ｌｂ 磁石の高さ方向寸法 2 Control rod 3 Control rod drive mechanism 13 Inner magnetic coupling element 14 Outer magnetic coupling element 21 Magnet 22 Outer yoke 22a Groove 22b Stepped portion 30 Nonmagnetic body La Height dimension of stepped portion of outer yoke Lb Height dimension of magnet

Claims (2)

対向配置された一対の磁気継手要素を介し電動機の回転トルクを伝達して制御棒を駆動する制御棒駆動機構において、
前記一対の磁気継手要素のうち少なくとも一の磁気継手要素は、一方側に複数の溝部が形成されたヨークと、前記ヨークの溝部にそれぞれ挿嵌され磁着した複数の磁石とを備え、
前記ヨークにおける前記磁石間の段差部の高さ方向寸法を零より大きく且つ前記磁石の高さ方向寸法の半分以下となるように形成し、前記磁石間に位置するように前記ヨーク段差部の高さ方向側に非磁性体を配設したことを特徴とする制御棒駆動機構。 In a control rod drive mechanism for driving the control rod by transmitting the rotational torque of the electric motor through a pair of opposed magnetic coupling elements,
At least one magnetic coupling element of the pair of magnetic coupling elements includes a yoke having a plurality of groove portions formed on one side thereof, and a plurality of magnets that are respectively fitted and magnetically attached to the groove portions of the yoke,
Half formed to be equal to or less than the height direction dimension of larger and the magnet than zero height dimension of the step portion between the magnets in the yoke, the yoke of the stepped portion height so as to be positioned between the magnet A control rod drive mechanism characterized in that a non-magnetic material is disposed on the lateral side . 請求項１記載の制御棒駆動機構において、前記非磁性体は、前記ヨーク及び前記磁石に接着する接着剤であることを特徴とする制御棒駆動機構。   2. The control rod drive mechanism according to claim 1, wherein the non-magnetic material is an adhesive that adheres to the yoke and the magnet.
JP2004373648A 2004-12-24 2004-12-24 Control rod drive mechanism Active JP4294580B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004373648A JP4294580B2 (en) 2004-12-24 2004-12-24 Control rod drive mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004373648A JP4294580B2 (en) 2004-12-24 2004-12-24 Control rod drive mechanism

Publications (2)

Publication Number Publication Date
JP2006177882A JP2006177882A (en) 2006-07-06
JP4294580B2 true JP4294580B2 (en) 2009-07-15

Family

ID=36732120

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004373648A Active JP4294580B2 (en) 2004-12-24 2004-12-24 Control rod drive mechanism

Country Status (1)

Country Link
JP (1) JP4294580B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101504040B1 (en) 2013-11-20 2015-03-18 한국원자력연구원 Control rod drive mechanism
KR101599003B1 (en) 2014-11-13 2016-03-02 한국전력기술 주식회사 Magnetic Jack Type Control Element Drive Mechanism for Precision Position Control of the Control Element Assembly

Also Published As

Publication number Publication date
JP2006177882A (en) 2006-07-06

Similar Documents

Publication Publication Date Title
EP0523353B1 (en) Heat resistant and explosion-proof type permanent magnetic synchronous motor
US11242230B2 (en) Mine explosion-isolating hoisting device with built-in type permanent magnet motor
US4748361A (en) Permanent magnet electric motor
GB2293281A (en) An energy storage and conversion apparatus
US9035511B2 (en) Electric motor braking system for rotolinear actuator
US20150171190A1 (en) Valve for fluid circulation
EP0160132A1 (en) Limited angle torque motor
US4508984A (en) Variable reluctance electric motor for the translation of control rods in a nuclear reactor
EP3739603B1 (en) Electromagnetic coil assembly for control rod drive mechanism, and fabrication method for same
US2780740A (en) Linear motion device
JP4294580B2 (en) Control rod drive mechanism
CN105788669A (en) Built-in type control bar driving mechanism
CN208285181U (en) Motor, electronic shield formula liquid pump, fluid circulation system and vehicle
US9852817B2 (en) Control rod drive mechanism built in nuclear reactor
CA1170910A (en) Electric rail propulsion unit
US10304571B2 (en) Magnetic jack type in-vessel control element drive mechanism
KR101169731B1 (en) Hybrid bottom mounted control rod drive device
US5307384A (en) Segmented coil assembly for control rod drive
EP0169421A2 (en) Control rod for a nuclear reactor
JPH1130683A (en) Nuclear reactor control rod driving device
CN205725198U (en) A kind of coreless permanent magnet formula generating and electric device
CN110867259A (en) Fuel rod with weak PCI effect for liquid lead bismuth cooling ADS reactor
JPH0197896A (en) Nuclear fusion device
CN219760837U (en) Cylindrical linear motor
JP2001088717A (en) Electric power steering device

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20070213

A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A712

Effective date: 20071206

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20080124

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20080129

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20080331

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20090407

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20090408

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120417

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Ref document number: 4294580

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120417

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130417

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140417

Year of fee payment: 5