JP4759454B2 - Circuit breaker - Google Patents

Circuit breaker Download PDF

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JP4759454B2
JP4759454B2 JP2006168263A JP2006168263A JP4759454B2 JP 4759454 B2 JP4759454 B2 JP 4759454B2 JP 2006168263 A JP2006168263 A JP 2006168263A JP 2006168263 A JP2006168263 A JP 2006168263A JP 4759454 B2 JP4759454 B2 JP 4759454B2
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contact
movable frame
spring
movable
circuit breaker
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JP2007035619A (en
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和彦 加藤
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Hitachi Industrial Equipment Systems Co Ltd
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Hitachi Industrial Equipment Systems Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H2001/223—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member using a torsion spring

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  • Breakers (AREA)

Description

この発明は、事業所や工場などで用いられる高容量タイプの回路遮断器であって、通電回路に大電流が流れたとき、引き外し装置によって接触子機構を開離させることによって回路を遮断する回路遮断器に関する。   This invention is a high-capacity type circuit breaker used in an office or factory, and when a large current flows through an energizing circuit, the circuit is cut off by opening the contact mechanism by a tripping device. It relates to a circuit breaker.

従来の高容量型の回路遮断器として、可動接点を担持する可動接点台を可動フレーム内において回動可能に支持し、可動接点台を固定接点台に担持されている固定接点に向けて接点ばねによって付勢しておき、更に、可動フレームと手動操作用のハンドルとの間に駆動ばねとリンクとからトグル機構を配設し、駆動ばねのばね力の作用線がトグル機構の不安定点の前後いずれの方向においても離れる方向に付勢される特性を利用して、オン動作のときには固定接点と可動接点との当接状態を付勢するように、またオフ動作のときには固定接点と可動接点との開離させるようにした構造のものがある（特許文献１、特許文献２参照）。この種の回路遮断器においては、定格電流を超えて流れる電流の大きさに応じて、比較的小さい電流のときにバイメタル動作で遮断する機構と、更に比較的大きな電流のときに電磁石動作で高速に作動する機構とが組み込まれている。   As a conventional high-capacity type circuit breaker, a movable contact base supporting a movable contact is rotatably supported in a movable frame, and the movable contact base is directed toward a fixed contact carried on the fixed contact base. Further, a toggle mechanism is disposed between the movable frame and the manual operation handle from the drive spring and the link, and the line of action of the spring force of the drive spring is before and after the unstable point of the toggle mechanism. Utilizing the characteristic of being urged away in any direction, the contact state between the fixed contact and the movable contact is urged in the on operation, and the fixed contact and the movable contact in the off operation. There is a structure in which these are separated (see Patent Document 1 and Patent Document 2). In this type of circuit breaker, depending on the magnitude of the current that flows beyond the rated current, a mechanism that cuts off by a bimetal operation when the current is relatively small, and a high speed by an electromagnet operation when the current is relatively large And a mechanism that operates.

従来の回路遮断器の動作を図５〜図７を参照して説明する。図５は従来の回路遮断器の縦断面図、図６は図５に示す回路遮断器の平面図、図７は従来の回路遮断器の開閉機構に用いられるトグル機構の概略図である。図６から理解されるように、ほとんどの回路遮断器においては、３相交流用の遮断器であって３極それぞれに同じ構造の接点機構及びその作動機構を並列に備えている。なお、図の煩雑さを回避するため、図６においては、開閉機構についての符号を両側の極についてのみ付している。   The operation of the conventional circuit breaker will be described with reference to FIGS. FIG. 5 is a longitudinal sectional view of a conventional circuit breaker, FIG. 6 is a plan view of the circuit breaker shown in FIG. 5, and FIG. 7 is a schematic view of a toggle mechanism used in the open / close mechanism of the conventional circuit breaker. As can be seen from FIG. 6, most circuit breakers are circuit breakers for three-phase alternating current, and each of the three poles has a contact mechanism having the same structure and its operating mechanism in parallel. In order to avoid the complexity of the figure, in FIG. 6, reference numerals for the opening / closing mechanism are given only to the poles on both sides.

図５〜図７に示す回路遮断器においては、ケース１とその上に設けられたカバー２とによってケーシングが構成され、そのケーシング内に回路遮断器の開閉機構４が設けられている。ケース１とカバー２とからなるケーシング内には、可動フレーム７が回転中心７ａによって回動可能に保持されている。可動フレーム７には、可動接点台１０が支軸１０ａによって軸支されている。可動接点台１０は、可動フレーム７に対して接点ばね３２のばね力で回動付勢されている。可動接点台１０に担持される可動接点９は、通常、ケース１に固定されている固定接点台１２に担持される固定接点１１に対し、接点ばね３２によって一定の接触圧が与えられて接触している。一方、カバー２の上部に形成された開口部２ａから外部にハンドル３が突出している。図７に特に示すように、ハンドル３に一体的に取付けられたハンドルレバー５が軸６によってケース１に回転自在に保持されている。ハンドルレバー５に連結された上レバー１３、可動フレーム７に連結された下レバー１４、及び両レバー１３，１４を回動可能に連結する枢支軸１５とから２節リンクが構成されており、ハンドルレバー５と２節リンク機構の枢支軸１５との間に駆動ばね３１が張設されている。上記２節リンクと駆動ばね３１とにより、両レバー１３，１４が真っ直ぐになったときの不安定点からいずれの側にも駆動ばね３１によって付勢されるトグル機構が形成されている。また、上レバー１３は、その上端に設けられたピン１６によってハンドルレバー５に回動可能に連結されており、下レバー１４は、その下端に設けられたピン１７によって可動フレーム７に回動可能に連結されている。   In the circuit breaker shown in FIGS. 5 to 7, a casing is constituted by a case 1 and a cover 2 provided thereon, and a circuit breaker switching mechanism 4 is provided in the casing. In the casing composed of the case 1 and the cover 2, a movable frame 7 is rotatably held by a rotation center 7a. A movable contact base 10 is pivotally supported on the movable frame 7 by a support shaft 10a. The movable contact base 10 is urged to rotate with respect to the movable frame 7 by the spring force of the contact spring 32. The movable contact 9 carried on the movable contact base 10 normally contacts the fixed contact 11 carried on the fixed contact base 12 fixed to the case 1 with a constant contact pressure applied by a contact spring 32. ing. On the other hand, a handle 3 protrudes from an opening 2 a formed in the upper part of the cover 2. As shown particularly in FIG. 7, a handle lever 5 integrally attached to the handle 3 is rotatably held on the case 1 by a shaft 6. The upper lever 13 connected to the handle lever 5, the lower lever 14 connected to the movable frame 7, and the pivot shaft 15 that rotatably connects both levers 13, 14 constitute a two-bar link, A drive spring 31 is stretched between the handle lever 5 and the pivot shaft 15 of the two-bar linkage mechanism. The two-link and the drive spring 31 form a toggle mechanism that is biased by the drive spring 31 on either side from the unstable point when the levers 13 and 14 are straight. The upper lever 13 is rotatably connected to the handle lever 5 by a pin 16 provided at the upper end thereof, and the lower lever 14 is rotatable to the movable frame 7 by a pin 17 provided at the lower end thereof. It is connected to.

回路遮断器を手動でオン・オフ動作させる場合には、外殻を構成するカバー２より突出したハンドル３の操作により行われる。ハンドル３を軸６の回りに回動することにより、駆動ばね３１のばね力の作用線が、２節リンクが真っ直ぐになった状態である不安定点を越えてトグル機構を有する開閉機構４の上レバー１３及び下レバー１４を含む２節リンクが働き、開閉機構４の一端に位置しており３極分の可動接点台１０を回転させて可動フレ−ム７が回動する。固定接点１１に対し可動接点９が接触して回路がオン状態にある図５に示す状態から、ハンドル３を負荷側方向（時計方向）に操作すると、開閉機構４の作動によって駆動ばね３１のばね力により上レバー２１がピン１６を中心として反時計方向に回り下レバー１４が持ち上げられるので、可動フレ−ム７が回転中心７ａを中心にして時計方向に回転する。その結果、可動接点台１０も同方向に回ることによって、図７に示すように、可動接点９が固定接点１１から開離し、遮断器がオフとなる。そしてオフ状態のとき、ハンドル３を反時計方向に回転させると、ハンドルレバー５も同様に回り、駆動ばね３１のばね力により上レバー１３がピン１６を中心として時計方向に回ると共に、下レバー１４を下方に押し下げ、下レバー１４の下方への移動によって可動フレーム７が反時計方向に回転し、可動接点台１０も同方向に回ることによって可動接点９が固定接点１１に接触し、回路がオン状態となる。   When the circuit breaker is manually turned on / off, the operation is performed by operating the handle 3 protruding from the cover 2 constituting the outer shell. By rotating the handle 3 about the shaft 6, the line of action of the spring force of the drive spring 31 exceeds the unstable point where the two-bar link is straight, and the top of the opening / closing mechanism 4 having the toggle mechanism. A two-bar link including the lever 13 and the lower lever 14 works, and is positioned at one end of the opening / closing mechanism 4. The movable contact base 10 for three poles is rotated to rotate the movable frame 7. When the handle 3 is operated in the load side direction (clockwise) from the state shown in FIG. 5 in which the movable contact 9 comes into contact with the fixed contact 11 and the circuit is on, the spring of the drive spring 31 is actuated by the opening / closing mechanism 4. Due to the force, the upper lever 21 rotates counterclockwise about the pin 16 and the lower lever 14 is lifted, so that the movable frame 7 rotates clockwise about the rotation center 7a. As a result, when the movable contact base 10 also rotates in the same direction, the movable contact 9 is separated from the fixed contact 11 as shown in FIG. 7, and the circuit breaker is turned off. When the handle 3 is rotated counterclockwise in the off state, the handle lever 5 rotates in the same manner, and the upper lever 13 rotates clockwise around the pin 16 by the spring force of the drive spring 31 and the lower lever 14 Is moved downward, the movable frame 7 is rotated counterclockwise by the downward movement of the lower lever 14, and the movable contact base 10 is also rotated in the same direction, so that the movable contact 9 contacts the fixed contact 11, and the circuit is turned on. It becomes a state.

このように、遮断器をオン動作又はオフ動作させるには、ハンドル３を移動させることにより、開閉機構４において、駆動ばね３１のばね力の作用線が２節リンクが真っ直ぐになった状態に対応する不安定点を越えてトグル機構が作動し、駆動ばね３１の力により開閉機構４の２節リンクが可動フレ−ム７の回転中心７ａを中心に回動する。可動フレ−ム７の回転によって可動接点台１０も回転し、可動接点９が固定接点１１に当接又は開離して接点接触状態となるときには通電可能になり、接点が離れるときには遮断状態となる。
可動接触子９と固定接触子１１との接点接触時の接点間圧力は、可動フレ−ム７と可動接点台１０との間に掛け渡して配置されている接点ばね３２により生じる。接点ばね３２は、可動フレ−ム７を時計方向に付勢し、可動接点台１０を可動フレ−ム７への枢支軸の回りに反時計方向に付勢する態様で介装されており、可動接触子９を固定接触子１１に押し当てる方向に回動付勢している。接点ばね３２による押し当て力によって、通電の安定性、接点接触信頼性が維持される。 As described above, in order to turn on or off the circuit breaker, by moving the handle 3, the action line of the spring force of the drive spring 31 corresponds to the state where the two-bar link is straightened in the opening / closing mechanism 4. The toggle mechanism operates beyond the unstable point, and the two-link of the opening / closing mechanism 4 is rotated about the rotation center 7 a of the movable frame 7 by the force of the drive spring 31. When the movable frame 7 is rotated, the movable contact base 10 is also rotated. When the movable contact 9 comes into contact with or is separated from the fixed contact 11 and becomes in a contact state, it can be energized.
The contact pressure at the time of contact between the movable contact 9 and the fixed contact 11 is generated by a contact spring 32 arranged between the movable frame 7 and the movable contact base 10. The contact spring 32 is interposed in such a manner that the movable frame 7 is urged clockwise and the movable contact base 10 is urged counterclockwise around the pivot shaft to the movable frame 7. The movable contact 9 is urged to rotate in a direction in which the movable contact 9 is pressed against the fixed contact 11. By the pressing force by the contact spring 32, the stability of energization and the contact contact reliability are maintained.

遮断器を流れる過電流の検出については、比較的小さい過電流が流れる過負荷領域では温度上昇に伴うバイメタル２１の動作により検出を行い、比較的大きな過電流が流れる短絡電流領域では電磁石２２，２３の動作により、その過電流の大きさに応じた引き外し時間で開閉機構４のラッチ２４を引き外す。ラッチ２４の外し動作により、２節リンクの働きで可動接点９が開極して固定接点１１との接触から外れ、過電流を遮断する。極数については、配電の相数（三相配電ならば三つ）に相当する極を持っており、三極の遮断器ならばバランスを考慮し中央の極に過電流の際に作動する開閉機構が設けられている。また、アークが発生したときには、アークガスの爆風は、種として消弧装置２５により誘導されて外部に排出される。   The overcurrent flowing through the circuit breaker is detected by the operation of the bimetal 21 accompanying the temperature rise in the overload region where a relatively small overcurrent flows, and the electromagnets 22 and 23 in the short-circuit current region where the relatively large overcurrent flows. With this operation, the latch 24 of the opening / closing mechanism 4 is detached with a trip time corresponding to the magnitude of the overcurrent. With the release operation of the latch 24, the movable contact 9 is opened by the action of the two-node link, and is disconnected from the contact with the fixed contact 11, thereby interrupting the overcurrent. As for the number of poles, it has poles corresponding to the number of phases of power distribution (three if it is three-phase power distribution). A mechanism is provided. When an arc is generated, the arc gas blast is guided by the arc extinguishing device 25 as a seed and discharged to the outside.

この形式の回路遮断器では、可動制御点９と固定接点１１間の接触圧力を発生させる接点ばね３２は、可動フレ−ム７では殆ど覆われておらず、その周囲が外殻を構成するカバー２内では露出されている。電路での短絡事故等により回路遮断器が大電流を遮断する場合、アークが発生するが、そのア−クの熱により隣接する金属部が溶解し周辺に飛び散ることがある。図示されているように、接点ばね３２については、可動接点９を固定接点１１に押し当てる方向に付勢するため、可動接点台１０を跨いでいる連結部３３が露出している。アークが発生した場合に、接点ばね３２の連結部３３はアークの影響を受け易く、連結部３３を溶断すると接点ばね３２としての機能を奏することができなくなり、接点圧力が消失して接点接触不良となり、短絡状態回復後には回路遮断器が通電不能状態を回復できない。また、接点ばね３２以外にも、可動接点を保持する可動接点台１０に溶融金属が飛び、可動接点台１０の動作不円滑やア−クの熱により溶解することがある。いずれも、従来の回路遮断器では大電流遮断時の部品に対する考慮が不十分であり、短絡事故のように大電流遮断が生じると、遮断後の通電性能の確保が難しく、通電の安定性、接点接触信頼性が維持されず、交換を余儀なくされる。   In this type of circuit breaker, the contact spring 32 that generates the contact pressure between the movable control point 9 and the fixed contact 11 is hardly covered by the movable frame 7, and the periphery of the contact spring 32 constitutes the outer shell. 2 is exposed. When a circuit breaker interrupts a large current due to a short circuit accident in an electric circuit, an arc is generated, but the adjacent metal part may be melted and scattered around by the heat of the arc. As shown in the drawing, the contact spring 32 is biased in the direction in which the movable contact 9 is pressed against the fixed contact 11, and therefore the connecting portion 33 straddling the movable contact base 10 is exposed. When an arc is generated, the connecting portion 33 of the contact spring 32 is easily affected by the arc, and if the connecting portion 33 is melted, the function as the contact spring 32 cannot be achieved, the contact pressure is lost, and the contact contact is poor. Thus, after the short-circuit state is recovered, the circuit breaker cannot recover from the inability to energize. In addition to the contact spring 32, the molten metal may fly to the movable contact base 10 that holds the movable contact, and may be melted due to unsmooth operation of the movable contact base 10 or arc heat. In any case, the conventional circuit breaker has insufficient consideration for the components at the time of large current interruption, and if a large current interruption occurs like a short-circuit accident, it is difficult to ensure the energization performance after interruption, the stability of energization, Contact contact reliability is not maintained, and replacement is forced.

特開平５−７４３１３号公報（段落［０００８］〜［００２２］，図９）JP-A-5-74313 (paragraphs [0008] to [0022], FIG. 9) 特開２０００−１１３７９８号公報（段落［０００２］〜［０００５］、［００２２］〜［００２５］、図１０、図１１）JP 2000-113798 A (paragraphs [0002] to [0005], [0022] to [0025], FIGS. 10 and 11)

そこで、可動フレーム、可動制御点台及び接点ばねの構造及び配置に工夫を凝らすことにより、短絡事故が生じたときに発生するアークの熱や或いはその熱によって周囲に飛び散った金属部が可動接点台や接点ばねに及ぼうとする影響を防止する点で解決すべき課題がある。   Therefore, by devising the structure and arrangement of the movable frame, movable control point base and contact spring, the heat of the arc generated when a short circuit accident occurs or the metal part scattered around by the heat is movable contact base. There is a problem to be solved in terms of preventing the influence on the contact spring.

この発明の目的は、短絡事故のように大電流遮断が生じた場合であっても、遮断後の通電性能を確保し、通電の安定性、接点接触の信頼性を高く維持することができる回路遮断器を提供することである。   The object of the present invention is a circuit capable of ensuring the energization performance after the interruption and maintaining the stability of the energization and the reliability of the contact contact even when a large current interruption occurs as in a short circuit accident. Is to provide a circuit breaker.

上記の課題を解決するために、この発明による回路遮断器は、固定接点を担持している固定接点台、可動接点を担持している可動接点台、当該可動接点台を支軸の回りに回動可能に支持する可動フレーム、可動接点台と可動フレームとの間に掛け渡され両接点間に接触圧力を付与する接点ばねを備えており、当該接点ばねは、可動接点台の両側方にそれぞれ配置されている２つのばね本体部、各ばね本体部から延びる一方の自由な腕から成り可動フレームに係合している係合部、及びばね本体部から延びる他方の腕同士を連結し可動接点台に係合する連結部を備えている回路遮断器において、接点ばねのばね本体部及び連結部は、両接点からの視点で可動フレームの背後に配置されていることを特徴としている。   In order to solve the above problems, a circuit breaker according to the present invention comprises a fixed contact base carrying a fixed contact, a movable contact base carrying a movable contact, and the movable contact base rotated around a spindle. A movable frame that is movably supported, and a contact spring that is stretched between the movable contact base and the movable frame and applies contact pressure between the two contact points, are provided on both sides of the movable contact base. Two movable springs, two free arms extending from each spring body, an engaging part engaged with the movable frame, and the other arm extending from the spring body are connected to each other to make a movable contact. In the circuit breaker including the connecting portion that engages with the base, the spring main body portion and the connecting portion of the contact spring are arranged behind the movable frame from the viewpoint of both contacts.

この回路遮断器によれば、回路遮断のオン動作及びオフ動作の動作そのものにおいては従来の回路遮断器と基本的に同等であるが、接点ばねは、そのばね本体部及び連結部が両接点からの視点で可動フレームの背後に配置されているので、短絡事故に起因して短時間に大きな過電流が流れて両接点間にアークが発生する場合には、接点ばねに与える影響を可及的に少なくすることができる。即ち、両接点が開離したときに、両接点間にアークが発生する。しかしながら、アークの熱や或いはその熱によって周囲に飛び散った金属部による影響が可動フレームに及んでも、その影響は可動フレームそれ自体に阻まれて、接点ばねの少なくともばね本体部と連結部にまで及ぶことがない。したがって、接点ばねのばね機能は守られ、その結果、短絡事故が回復されたときの回路遮断器における通電性能を確保することができる。   According to this circuit breaker, the circuit breaker ON / OFF operation itself is basically the same as that of the conventional circuit breaker, but the contact spring has its spring body portion and connecting portion from both contacts. Because it is placed behind the movable frame from the viewpoint of, if a large overcurrent flows in a short time due to a short circuit accident and an arc occurs between both contacts, the influence on the contact spring is as much as possible Can be reduced. That is, when both contacts are separated, an arc is generated between the two contacts. However, even if the influence of the metal part scattered around by the heat of the arc or the heat is exerted on the movable frame, the influence is blocked by the movable frame itself, and at least the spring main body part and the connection part of the contact spring. It does not reach. Therefore, the spring function of the contact spring is protected, and as a result, the energization performance in the circuit breaker when the short-circuit accident is recovered can be ensured.

接点ばねと可動フレームとの構造をこのようにすることにより、可動フレ−ムは、両接点側からの視点から観て、接点ばねのばね本体部及び連結部を含む殆どの部分を覆う形状を備えており、２本の自由な腕の先端部から成り可動フレームに係合する係合部についてのみ露出する可能性がある。係合部はアークの影響が仮に及ぶことがあって一部が溶解するような事態が生じても、可動フレームとの係合は残り易く、そうした係合が残る限りは、両接点間に接触圧力を付与する機能が維持される。   By making the structure of the contact spring and the movable frame in this way, the movable frame has a shape covering most parts including the spring main body portion and the connecting portion of the contact spring from the viewpoint from both contact sides. There is a possibility that only the engaging portion that is composed of two free arms and engages the movable frame is exposed. Even if the engagement part may be affected by the arc and partly melts, the engagement with the movable frame is likely to remain, and as long as such engagement remains, contact between both contacts The function of applying pressure is maintained.

この回路遮断器において、接点ばねのばね本体部及び連結部は、両接点からの視点で可動接点台の背後側に係合していることが好ましい。接点ばねのばね本体部及び連結部は両接点からの視点で可動接点台の背後側に配置されているので、短絡事故に起因して両接点間にアークが発生する場合には、アークの熱や或いはその熱によって周囲に飛び散った金属部による影響が可動接点台の接点ばねが設けられている箇所に及んでも、その影響は可動接点台それ自体に阻まれて接点ばねの連結部にまで及ぶことがない。   In this circuit breaker, it is preferable that the spring main body portion and the connecting portion of the contact spring are engaged with the rear side of the movable contact base from the viewpoint of both contacts. Since the spring body and connecting part of the contact spring are located behind the movable contact point from the viewpoint of both contacts, if an arc occurs between the two contacts due to a short circuit accident, the heat of the arc Even if the influence of the metal part scattered around by the heat reaches the place where the contact spring of the movable contact base is provided, the influence is blocked by the movable contact base itself and reaches the connection part of the contact spring. It does not reach.

上記の回路遮断器において、接点ばねの係合部及び連結部は、支軸から可動接点と支軸とを結ぶ線に実質的に直交する方向に延びる態様で配置することができる。接点ばねについて、可動フレームと係合する係合部及び可動接点台と係合する連結部をこのように配置することにより、接点からの視点で観て係合部と連結部とは略同じ距離にあり、アークが発生した場合にはそのアークの影響から等しく遠く離れた配置、或いは両接点の開離時における可動接点台の回動を考慮したときには、両接点側に露出する係合部を連結部よりも遠ざけた配置を得ることができる。なお、接点ばねの捩じりばね部は、可動接点台の支軸に係止させると、可動フレームへの接点ばねの係止が安定する。   In the circuit breaker described above, the engaging portion and the connecting portion of the contact spring can be arranged in a manner extending from the support shaft in a direction substantially perpendicular to a line connecting the movable contact and the support shaft. With regard to the contact spring, by disposing the engaging portion that engages with the movable frame and the connecting portion that engages with the movable contact base in this manner, the engaging portion and the connecting portion are substantially the same distance from the viewpoint from the contact point. When an arc is generated, the engagement part exposed to both contact points should be removed when considering the distantly distant arrangement from the influence of the arc or the rotation of the movable contact point when the two contacts are separated. An arrangement away from the connecting portion can be obtained. When the torsion spring portion of the contact spring is locked to the support shaft of the movable contact base, the contact spring is stably locked to the movable frame.

上記の回路遮断器は、手動でオン・オフ動作させるための操作部と可動フレームとの間に配置されており且つ可動フレームに作用し両接点間の開閉操作を行う開閉機構を備えており、開閉機構は、２節リンクと駆動ばねとを有し且つ可動フレームを不安定点の各側に設けられる両接点を接触付勢する接触位置と両接点を開離付勢する開離位置との間で切り
替えるトグル機構に構成することができる。開閉機構を、上記のように、手動による操作部と可動フレームとの間に配置し、駆動ばねを用いたトグル機構に構成することにより、手動でオン・オフ動作させるために操作部を操作するときに、２節リンクと駆動ばねとから成るトグル機構は、２節リンクが直線状態に延びる状態で定められる不安定点を越える動作をし、駆動ばねのばね力に基づいてその不安定点を越えた側に可動フレームを付勢し、両接点を接触付勢する接触位置又は両接点を開離付勢する開離位置に切り換えてそれぞれの位置を取らせることができる。 The circuit breaker described above is disposed between the operation unit for manually turning on and off and the movable frame, and includes an opening / closing mechanism that acts on the movable frame and performs an opening / closing operation between both contacts. The opening / closing mechanism has a two-link and a drive spring, and a position between a contact position where the movable frame is urged to contact both contacts provided on each side of the unstable point and a position where the both contacts are separated and urged. The toggle mechanism can be configured to be switched with. As described above, the opening / closing mechanism is arranged between the manual operation unit and the movable frame, and is configured as a toggle mechanism using a drive spring, whereby the operation unit is operated to manually turn on and off. Sometimes, the toggle mechanism consisting of a two-bar link and a drive spring moves beyond the instability point determined by the state that the two-bar link extends in a straight line, and exceeds the instability point based on the spring force of the drive spring. The movable frame can be urged to the side, and the position can be changed by switching to a contact position where both the contacts are urged to contact or an opening position where both the contacts are separated and urged.

上記のように構成されたこの発明の回路遮断器によれば、接点ばねは、その連結部が両接点からの視点で可動フレームの背後に配置されていることを特徴としているので、短絡事故などのように大電流遮断が生じ、それに起因して短時間に大きな過電流が流れて両接点間にアークが発生する場合に、アークの熱や或いはその熱によって周囲に飛び散った金属部による影響が可動フレームに及んでも、その影響は可動フレームそれ自体に阻まれて接点ばねの捩じりばね部や連結部にまで及ぶことがない。したがって、接点ばねに与えるアークの影響を可及的に少なくすることができ、接点ばねのばね機能は守られ、その結果、遮断後の通電性能を確保し、高い信頼性の回路遮断器が実現することができる。   According to the circuit breaker of the present invention configured as described above, the contact spring is characterized in that its connecting portion is arranged behind the movable frame from the viewpoint of both contacts, so that a short circuit accident or the like When a large current interruption occurs as described above and a large overcurrent flows in a short time and an arc is generated between the two contacts, the influence of the arc heat or the metal part scattered around by the heat is affected. Even when it reaches the movable frame, the influence is blocked by the movable frame itself and does not reach the torsion spring portion or the connecting portion of the contact spring. Therefore, the influence of the arc on the contact spring can be reduced as much as possible, and the spring function of the contact spring is preserved. As a result, the energization performance after breaking is ensured and a highly reliable circuit breaker is realized. can do.

図１〜図４に基づいて、本発明による回路遮断器の実施形態の詳細を説明する。図１は、回路遮断器の可動部を含む内部構造の上面図、図２は図１に関連する回路遮断器の断面図、図３は図２に示す回路遮断器において可動フレームを別断面にて切断した断面図、図４は図１に示す回路遮断構造における可動フレームの要部を示す拡大平面図である。各図において、図５又は図６に示す従来の回路遮断器に用いられている構成要素及び部位と同等のものには同じ符号を付すことにより、再度の説明を省略する。   Based on FIGS. 1-4, the detail of embodiment of the circuit breaker by this invention is demonstrated. 1 is a top view of an internal structure including a movable part of a circuit breaker, FIG. 2 is a sectional view of the circuit breaker related to FIG. 1, and FIG. 3 is a sectional view of the movable frame in the circuit breaker shown in FIG. FIG. 4 is an enlarged plan view showing the main part of the movable frame in the circuit breaker structure shown in FIG. In each figure, the same components and parts used in the conventional circuit breaker shown in FIG. 5 or FIG.

図１〜図３に示す回路遮断器においては、図示を省略しているが、図７に示すトグル機構と同等のものが備わっている。可動フレーム７は、可動接点台１０の各側方において可動接点台１０に沿って延びる袖部４０，４０、及び両袖部４０，４０を繋ぐブリッジ部４１を備えている。可動接点台１０は、可動接点９と固定接点１１の当接状態では固定接点台１２に向かって延びており、開離状態では支軸１０ａの回りに回動することができるように、両袖部４０，４０及びブリッジ部４１によって囲まれている。したがって、可動フレーム７は、可動接点９と離れた側、即ち、支軸１０ａの周囲を取り囲む構造に構成されている。   Although the circuit breaker shown in FIGS. 1-3 is abbreviate | omitting illustration, the thing equivalent to the toggle mechanism shown in FIG. 7 is provided. The movable frame 7 includes sleeve portions 40, 40 extending along the movable contact base 10 on each side of the movable contact base 10, and a bridge portion 41 that connects both the sleeve portions 40, 40. The movable contact base 10 extends toward the fixed contact base 12 when the movable contact 9 and the fixed contact 11 are in contact with each other, and can be rotated around the support shaft 10a in the open state. It is surrounded by the parts 40 and 40 and the bridge part 41. Therefore, the movable frame 7 is configured to surround the side away from the movable contact 9, that is, the periphery of the support shaft 10a.

ねじりばねにより構成されている接点ばね４２は、可動フレーム７の各側において、捩じりばねに構成されているばね本体部４３、ばね本体部４３から延びる一方の自由な腕４３ａの先端部から成り可動フレーム７に係合している係合部４４、及びばね本体部４３から延びる他方の腕４３ｂの先端部同士を連結して成り可動接点台１０に係合する連結部４５を備えている。   A contact spring 42 constituted by a torsion spring is formed on each side of the movable frame 7 from a spring main body 43 constituted as a torsion spring, and a distal end portion of one free arm 43 a extending from the spring main body 43. An engaging portion 44 that engages with the movable frame 7 and a connecting portion 45 that connects the distal ends of the other arm 43b extending from the spring main body portion 43 to engage with the movable contact base 10 are provided. .

ばね本体部４３は、幾重かにコイル状に巻かれており、捩じり方向に変位させて用いる部分であり、可動接点台１０の支軸１０ａの周りに緩く係止されている。ばね本体部４３からは、腕４３ａ，４３ｂがそれぞれ、図２（図３）で略上方であるハンドル３の方向と、その略１８０度反対側であるケース１の方向へと延びている。腕４３ａ，４３ｂが延びる方向は、接点９，１１が当接状態にある接点部と支軸１０ａを結ぶ線と略直交する方向である。係止部４４は、ブリッジ部４１の開口４０ａの縁を定める端縁４１ａに当接することで、可動フレーム７に係合している。連結部４５は、可動接点台１０に対して、その裏面側に形成されたＵ字溝４６の底部において係合している。なお、可動フレーム７は、図２においては、開口４０ａの位置から離れた位置を前後方向に延びる縦平面にて切断して示されており、図３においては、開口４０ａ内を通って前後方向に延びる縦平面にて切断して示されている。   The spring main body 43 is wound several times in a coil shape and is used by being displaced in the twisting direction, and is loosely locked around the support shaft 10 a of the movable contact base 10. From the spring main body 43, arms 43a and 43b extend in the direction of the handle 3 that is substantially upward in FIG. 2 (FIG. 3) and the direction of the case 1 that is approximately 180 degrees opposite thereto. The direction in which the arms 43a and 43b extend is a direction substantially orthogonal to a line connecting the contact point where the contacts 9 and 11 are in contact with the support shaft 10a. The locking portion 44 is engaged with the movable frame 7 by contacting an end edge 41 a that defines the edge of the opening 40 a of the bridge portion 41. The connecting portion 45 is engaged with the movable contact base 10 at the bottom portion of the U-shaped groove 46 formed on the back side thereof. In FIG. 2, the movable frame 7 is shown by cutting a position away from the position of the opening 40a by a vertical plane extending in the front-rear direction, and in FIG. 3, passing through the opening 40a in the front-rear direction. It is shown cut by a vertical plane extending to

接点ばね４２は、ばね本体部４３が捩じり変形された状態で、係合部４４と連結部４５とがそれぞれ可動フレーム７と可動接点台１０とに係合される。したがって、係合部４４と連結部４５との間に働く捩じりばね力の復元力によって、可動接点台１０はその支軸１０ａを中心に図２及び図３において反時計方向に付勢され、可動接点９が固定接点１１と当接し通電可能となる。可動フレーム７は、ばね力の復元力に起因して同じ大きさの反力を受けるが、可動フレーム７を動かすほどの大きな力ではないので、可動フレーム７が動作することはない。   In the contact spring 42, the engaging portion 44 and the connecting portion 45 are engaged with the movable frame 7 and the movable contact base 10, respectively, in a state where the spring main body portion 43 is twisted and deformed. Therefore, the movable contact base 10 is urged counterclockwise in FIGS. 2 and 3 around the support shaft 10a by the restoring force of the torsion spring force acting between the engaging portion 44 and the connecting portion 45. The movable contact 9 comes into contact with the fixed contact 11 and can be energized. Although the movable frame 7 receives the same reaction force due to the restoring force of the spring force, the movable frame 7 does not operate because it is not a force large enough to move the movable frame 7.

上記の構造を備えた回路遮断器において、可動接点９と固定接点１１との接点部側から接点ばね４２を見た場合、接点ばね４２の腕４３ｂ，４３ｂの先端部であり可動フレ−ム７に係合する係合部４４が露出するのみである。また、係合部４４及び連結部４５は、腕４３ａ，４３ｂの延びる方向から判るように、支軸１０ａから可動接点９と支軸１０ａとを結ぶ線に実質的に直交する方向に延びる態様で配置されている。したがって、接点ばね４２の殆どの部分、即ち、ばね本体部４３，４３及び連結部４５は可動フレ−ム７で覆われる背後側の位置を占めている。可動フレーム７の要部の拡大平面図である図４に示すように、袖部４０やブリッジ部４１で囲まれる開口部４０ａは、上面から見ても、可動フレーム７において占める割合が非常に小さくなった狭い領域（図４において、周縁部分をハッチングで縁取りした領域）あり、接点ばね４２の係合部４４は開口部４０ａに僅かに露出しているに過ぎない。接点ばね４２の主要な殆どの部分が露出していないので、電路での短絡事故発生時により遮断器が大電流を遮断してアークによる金属溶融物が飛散した場合にでも、接点ばね４２の主要な部分の損傷、溶断等を防止することができる。このように、短絡電流遮断後においても通電性能を維持することが可能となり、高信頼性の遮断器を実現することができる。   In the circuit breaker having the above-described structure, when the contact spring 42 is viewed from the contact portion side of the movable contact 9 and the fixed contact 11, it is the distal end portion of the arms 43b and 43b of the contact spring 42 and the movable frame 7 Only the engaging portion 44 that engages with is exposed. Further, as can be seen from the extending direction of the arms 43a and 43b, the engaging portion 44 and the connecting portion 45 extend in a direction substantially perpendicular to a line connecting the movable contact 9 and the support shaft 10a from the support shaft 10a. Has been placed. Therefore, most of the contact spring 42, that is, the spring main body portions 43, 43 and the connecting portion 45 occupy the position on the back side covered with the movable frame 7. As shown in FIG. 4, which is an enlarged plan view of the main part of the movable frame 7, the opening 40 a surrounded by the sleeve portion 40 and the bridge portion 41 occupies a very small ratio in the movable frame 7 even when viewed from above. There is a narrow area (in FIG. 4, the peripheral edge is hatched), and the engaging portion 44 of the contact spring 42 is only slightly exposed to the opening 40a. Since most of the main part of the contact spring 42 is not exposed, even when the breaker interrupts a large current due to the occurrence of a short circuit accident in the electric circuit and the metal melt due to the arc is scattered, It is possible to prevent damage to parts, fusing, and the like. In this way, it is possible to maintain energization performance even after the short-circuit current is interrupted, and a highly reliable circuit breaker can be realized.

また本願発明の他の実施例を図8および図9で説明する。前記実施例では可動フレ−ム40の開口40-aにばねの腕43-aを通す必要があり、組立作業性についてあまり考慮されていない。   Another embodiment of the present invention will be described with reference to FIGS. In the above-described embodiment, it is necessary to pass the spring arm 43-a through the opening 40-a of the movable frame 40, and the assembly workability is not considered much.

本実施例では可動フレ−ム40に設けた可動フレームの片持ち支持構造の係止部40-ｂにばねの腕43-aを掛けて組立てる構造で作業性が飛躍的に向上する。   In this embodiment, the workability is dramatically improved by a structure in which the arm 43-a of the spring is hung on the engaging portion 40-b of the cantilever support structure of the movable frame provided in the movable frame 40 and assembled.

なお、本発明の接点ばね４２の配置により、可動接点台１０は接点ばね４２により接点側方向へ力を受ける。そのため、可動フレ−ム７に形成したＵ字溝４６の底部に押し付けられるため、特別な部品を追加しなくても可動接点台１０を可動フレ−ム７に組付けることが可能となる。   The movable contact base 10 receives a force in the contact side direction by the contact spring 42 by the arrangement of the contact spring 42 of the present invention. Therefore, since it is pressed against the bottom of the U-shaped groove 46 formed in the movable frame 7, the movable contact base 10 can be assembled to the movable frame 7 without adding any special parts.

以上の発明から明らかなように、接点ばねの配置の工夫と可動フレ−ムに接点ばねがほとんど露出しない形状を形成することによって、短絡電流遮断後においても通電性能を維持することが可能となり通電信頼性の高い回路遮断器を提供することが可能となる。   As is apparent from the above inventions, the arrangement of the contact springs and the shape in which the contact springs are hardly exposed are formed on the movable frame, so that the energization performance can be maintained even after the short-circuit current is interrupted. A highly reliable circuit breaker can be provided.

この発明による回路遮断器（１極分）の一実施形態を示す上面図。The top view which shows one Embodiment of the circuit breaker (for 1 pole) by this invention. この発明による回路遮断器の別の実施形態の断面図。Sectional drawing of another embodiment of the circuit breaker by this invention. 図２に示す回路遮断器の別の断面図。FIG. 3 is another cross-sectional view of the circuit breaker shown in FIG. 2. 図１に示す回路遮断構造における可動フレームの要部を示す拡大平面図。The enlarged plan view which shows the principal part of the movable frame in the circuit interruption structure shown in FIG. 従来の回路遮断器の縦断面図。The longitudinal cross-sectional view of the conventional circuit breaker. 図５に示す回路遮断器の平面図。The top view of the circuit breaker shown in FIG. 従来の回路遮断器の要部を示す側面概略図。The side schematic diagram which shows the principal part of the conventional circuit breaker. この発明の他の実施例の回路遮断器の断面図Sectional drawing of the circuit breaker of other Examples of this invention 図８の回路遮断器の上面図Top view of the circuit breaker of FIG.

符号の説明Explanation of symbols

１…ケース
２…カバー
２ａ…開口部
３…ハンドル
４…開閉機構
５…ハンドルレバー
６…軸
７…可動フレ−ム
７ａ…回転中心
９…可動接点
１０…可動接点台
１０ａ…可動接点台の支軸
１１…固定接点
１２…固定接点台
１３…上レバー
１４…下レバー
１５…枢支軸
１６，１７…ピン
２１…バイメタル
２２，２３…電磁石
２４…ラッチ
２５…消弧装置
３１…駆動ばね
３２…接点ばね
３３…連結部
４０…袖部
４０ａ…開口
４１…ブリッジ部
４１ａ…端縁
４２…接点ばね
４３…ばね本体部
４３ａ，４３ｂ…腕
４４…係合部
４５…連結部
４６…Ｕ字溝
DESCRIPTION OF SYMBOLS 1 ... Case 2 ... Cover 2a ... Opening part 3 ... Handle 4 ... Opening / closing mechanism 5 ... Handle lever 6 ... Shaft 7 ... Movable frame 7a ... Center of rotation 9 ... Movable contact 10 ... Movable contact base 10a ... Support of movable contact base Shaft 11 ... Fixed contact 12 ... Fixed contact base 13 ... Upper lever 14 ... Lower lever 15 ... Pivoting shaft 16, 17 ... Pin 21 ... Bimetal 22, 23 ... Electromagnet 24 ... Latch 25 ... Arc extinguishing device 31 ... Drive spring 32 ... Contact spring 33 ... connecting portion 40 ... sleeve portion 40a ... opening 41 ... bridge portion 41a ... edge 42 ... contact spring 43 ... spring body 43a, 43b ... arm 44 ... engaging portion 45 ... connecting portion 46 ... U-shaped groove

Claims (4)

固定接点を担持している固定接点台、
可動接点を担持している可動接点台、
前記可動接点台を支軸の回りに回動可能に支持する可動フレーム、
前記可動接点台と前記可動フレームとの間に掛け渡され前記両接点が接触する力を付与する接点ばね
を備えており、
前記可動フレームは、前記支軸の周囲を取り囲む構造に構成されており、
前記接点ばねは、前記支軸の周りに係止されており、
前記接点ばねは、前記可動フレームの背後であって、前記可動フレームによって、前記支軸の周囲を取り囲まれる構造で、前記両接点からの視点で前記可動フレームに覆われる位置に配置され、
大電流遮断が生じ、それに起因して短時間に大きな過電流が流れて、両接点が開離したときに、両接点間にアークが発生する場合に、
アークの熱や或いはその熱によって周囲に飛び散った金属部による影響が前記可動フレームに及んでも、その影響は前記可動フレームそれ自体に阻まれて、前記接点ばねに与えるアークの影響を少なくすることができる
ことを特徴とする回路遮断器。 A fixed contact base carrying a fixed contact,
A movable contact stand carrying a movable contact,
A movable frame that rotatably supports the movable contact base around a support shaft;
A contact spring that is applied between the movable contact base and the movable frame and applies a force to contact the two contacts;
The movable frame is configured to surround the support shaft.
The contact spring is locked around the spindle;
The contact spring is located behind the movable frame and is surrounded by the movable frame around the support shaft, and is disposed at a position covered by the movable frame from the viewpoint of the two contacts .
When a large current interruption occurs and a large overcurrent flows in a short period of time, and when both contacts are separated, an arc occurs between both contacts.
Even if the heat of the arc or the influence of the metal part scattered around by the heat reaches the movable frame, the influence is blocked by the movable frame itself, and the influence of the arc on the contact spring is reduced. circuit breaker according to claim <br/> that can. 前記接点ばねは、
前記可動接点台の両側方にそれぞれ配置されている２つのばね本体部、
前記各ばね本体部から延びる一方の自由な腕から成り前記可動フレームに係合している係合部、
及び前記ばね本体部から延びる他方の腕同士を連結し前記可動接点台に係合する連結部を備えており、
前記接点ばねの前記連結部は、前記両接点からの視点で前記可動接点台に覆われる位置で係合している
ことを特徴とする請求項１に記載の回路遮断器。 The contact spring is
Two spring body portions respectively disposed on both sides of the movable contact base;
An engaging portion which is composed of one free arm extending from each spring body portion and is engaged with the movable frame;
And a connecting portion that connects the other arms extending from the spring main body and engages the movable contact base,
2. The circuit breaker according to claim 1, wherein the connection portion of the contact spring is engaged at a position covered by the movable contact base from a viewpoint from both the contacts. 前記接点ばねの前記係合部及び前記連結部は、前記支軸から前記可動接点と前記支軸とを結ぶ線に実質的に直交する方向に延びる態様で配置されており、
前記接点ばねの前記係合部は前記可動フレームの片持ち支持構造の係止部に係合する構造であることを特徴とする請求項１又は２に記載の回路遮断器。 The engagement portion and the connection portion of the contact spring are arranged in a manner extending from the support shaft in a direction substantially perpendicular to a line connecting the movable contact and the support shaft,
The circuit breaker according to claim 1 or 2, wherein the engaging portion of the contact spring is configured to engage with a locking portion of a cantilever support structure of the movable frame. 手動でオン・オフ動作させる操作部と前記可動フレームとの間に配置されており且つ前記可動フレームに作用し前記両接点間の開閉操作を行う開閉機構を備えており、
前記開閉機構は、２節リンクと駆動ばねとを有し且つ前記可動フレームを不安定点の各側に設けられる前記両接点を接触付勢する接触位置と前記両接点を開離付勢する開離位置との間で切り替えるトグル機構に構成されていることを特徴とする請求項１〜３のいずれか１項に記載の回路遮断器。 An open / close mechanism that is disposed between an operation unit that is manually turned on / off and the movable frame and that operates on the movable frame and performs an open / close operation between the two contacts;
The opening / closing mechanism has a two-node link and a drive spring, and the movable frame is provided on each side of the unstable point. The circuit breaker according to any one of claims 1 to 3, wherein the circuit breaker is configured as a toggle mechanism that switches between positions.
JP2006168263A 2005-06-22 2006-06-19 Circuit breaker Active JP4759454B2 (en)

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JP4759454B2 true JP4759454B2 (en) 2011-08-31

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Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61194937U (en) * 1985-05-28 1986-12-04
JPH0824023B2 (en) * 1986-08-04 1996-03-06 株式会社東芝 Circuit breaker
JPH0715088Y2 (en) * 1989-04-10 1995-04-10 株式会社東芝 Circuit breaker
JP2604702Y2 (en) * 1993-08-20 2000-06-05 寺崎電気産業株式会社 Circuit breaker
JP3853862B2 (en) * 1995-12-13 2006-12-06 三菱電機株式会社 Circuit breaker
JP3348598B2 (en) * 1996-06-28 2002-11-20 三菱電機株式会社 Circuit breaker
JP2000268697A (en) * 1999-03-19 2000-09-29 Mitsubishi Electric Corp Movable contact device for circuit breaker

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