JP5170661B2 - Overcurrent trip mechanism - Google Patents

Overcurrent trip mechanism Download PDF

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JP5170661B2
JP5170661B2 JP2008104129A JP2008104129A JP5170661B2 JP 5170661 B2 JP5170661 B2 JP 5170661B2 JP 2008104129 A JP2008104129 A JP 2008104129A JP 2008104129 A JP2008104129 A JP 2008104129A JP 5170661 B2 JP5170661 B2 JP 5170661B2
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bimetal
tripping mechanism
overcurrent
engaging piece
overcurrent tripping
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JP2009259438A (en
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啓太 清水
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河村電器産業株式会社
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Description

本発明は、回路遮断器における過電流引外し機構に関するものである。   The present invention relates to an overcurrent tripping mechanism in a circuit breaker.

従来、過電流引外し機構を用いた回路遮断器には特許文献１に記載されているような、主回路に過電流、短絡、漏電等の異常が発生した場合はケース２１内部に設けられるバイメタル２３と掛合片２４とからなる引き外し機構が駆動して開閉機構部による可動接触子への押圧を解除し、バネにより固定接触子から可動接触子を開離させて主回路が遮断するようになっている回路遮断器があった。   Conventionally, in a circuit breaker using an overcurrent tripping mechanism, as described in Patent Document 1, when an abnormality such as an overcurrent, a short circuit, or a leakage occurs in a main circuit, a bimetal provided in the case 21 The tripping mechanism composed of the contact piece 23 and the engagement piece 24 is driven to release the pressing of the movable contact by the opening / closing mechanism, and the main circuit is shut off by separating the movable contact from the fixed contact by a spring. There was a circuit breaker.

又、過電流引外し機構を用いた回路遮断器には特許文献２に記載されているような、ケース３１の内部に、ラッチ部材との係止が解除されると通常時に蓄積した力によって接点部を強制開極させる掛合片３４と、一端側を固定端とするとともに他端側を自由端とし、通電電路に過電流が流れたときに自由端が掛合片３４を係止解除方向に押圧駆動するバイメタル３２と、バイメタル３２と掛合片３４との相対的な位置関係を変化させる調整螺子と、調整螺子が螺合するねじ孔が貫設されたナット部材とを収納した回路遮断器があった。 Further, in the circuit breaker using the overcurrent tripping mechanism, as described in Patent Document 2, when the engagement with the latch member is released inside the case 31, the contact is generated by the force accumulated at the normal time. The engaging piece 34 for forcibly opening the portion and the one end side as a fixed end and the other end side as a free end, and when the overcurrent flows through the energizing circuit, the free end presses the engaging piece 34 in the unlocking direction. There is a circuit breaker that houses a bimetal 32 to be driven, an adjusting screw that changes the relative positional relationship between the bimetal 32 and the engaging piece 34, and a nut member through which a screw hole into which the adjusting screw is screwed. It was.

しかしながら、特許文献１に記載の発明では、過電流が流れた際にバイメタルが湾曲し、掛合片を解除方向へ押圧するが、バイメタルが掛合片を押圧しようとする力が掛合片に上手く伝わらず、掛合片が正常に作動しない場合があるという欠点がある。これにより、掛合片が電路を遮断するまでの時間が一定ではなくなるという欠点がある。又、これを解決するために掛合片が保持される力を弱くすることが考えられるが、それでは電路が遮断されるまでの時間が短くなりすぎる可能性があるという欠点がある。   However, in the invention described in Patent Document 1, the bimetal is bent when an overcurrent flows, and the engaging piece is pressed in the release direction, but the force by which the bimetal attempts to press the engaging piece is not transmitted well to the engaging piece. There is a drawback that the engaging piece may not operate normally. Thereby, there exists a fault that time until a latching piece interrupts | blocks an electric circuit becomes non-constant. Further, in order to solve this, it is conceivable to weaken the force for holding the engaging piece, but there is a drawback that the time until the electric circuit is cut off may be too short.

又、特許文献２に記載の発明では、過電流が流れた際にバイメタルが湾曲し、掛合片を解除方向へ押圧するが、バイメタルが掛合片を押圧しようとする力が掛合片に上手く伝わらず、掛合片が正常に作動しない場合があるという欠点がある。これにより、掛合片が電路を遮断するまでの時間が一定ではなくなるという欠点がある。又、これを解決するために掛合片が保持される力を弱くすることが考えられるが、それでは電路が遮断されるまでの時間が短くなりすぎる可能性があるという欠点がある。   Further, in the invention described in Patent Document 2, the bimetal is bent when an overcurrent flows, and the engaging piece is pressed in the release direction, but the force by which the bimetal tries to press the engaging piece is not transmitted well to the engaging piece. There is a drawback that the engaging piece may not operate normally. Thereby, there exists a fault that time until a latching piece interrupts | blocks an electric circuit becomes non-constant. Further, in order to solve this, it is conceivable to weaken the force for holding the engaging piece, but there is a drawback that the time until the electric circuit is cut off may be too short.

このため、本発明によって解決しようとする課題は、過電流が流れてバイメタルが湾曲し、掛合片を解除方向へ押圧しようとする力を付勢することでバイメタルの動作を助け、電路が遮断されるまでの所要時間を一定に得られる過電流引外し機構を少ない部品数で提供することにある。   For this reason, the problem to be solved by the present invention is that the overcurrent flows, the bimetal is bent, and the force to push the engaging piece in the releasing direction is energized to assist the operation of the bimetal, and the electric circuit is interrupted. To provide an overcurrent tripping mechanism with a constant number of parts required until a certain number of parts is obtained.

上記した課題を解決するためになされた本発明の過電流引外し機構は、回路遮断器のケース内部に設けられる過電流引き外し機構であって、過電流引き外し機構は長板から形成されると共に一端を固定し、他端を自由に設けてなるバイメタルと、バイメタルによって押圧駆動する掛合片とからなり、バイメタルの配置位置近傍に掛合片を押圧する方向にバイメタルを付勢する付勢手段を設けた。 The overcurrent tripping mechanism of the present invention made to solve the above-described problem is an overcurrent tripping mechanism provided inside a case of a circuit breaker, and the overcurrent tripping mechanism is formed from a long plate. And a biasing means for biasing the bimetal in a direction in which the latching piece is pressed in the vicinity of the bimetal arrangement position. Provided.

本発明の過電流引外し機構によれば、バイメタルの配置位置近傍に付勢手段を設けることによって、バイメタルが掛合片を押圧する力を助けることが可能である。これにより、バイメタルが掛合片を押圧しようとする力が正常に伝わり、電路を遮断するまでの時間を一定に得ることが可能である。   According to the overcurrent tripping mechanism of the present invention, it is possible to assist the force with which the bimetal presses the engaging piece by providing the biasing means in the vicinity of the arrangement position of the bimetal. As a result, it is possible to obtain a constant time until the force by which the bimetal attempts to press the engaging piece is normally transmitted and the electric circuit is cut off.

本発明では、電路の遮断までの時間を一定に得られる構造を少ない部品数で可能にした。   In the present invention, a structure that can obtain a constant time until interruption of the electric circuit can be obtained with a small number of parts.

以下、本発明の実施の形態を説明する。
回路遮断器のケース１、１１内部に設けられる過電流引き外し機構であって、この過電流引外し機構は長板から形成されると共に一端を負荷座３、１３に固定し、他端を自由に設けてなるバイメタル２、１２と、バイメタル２、１２によって押圧駆動する掛合片４とからなり、第一付勢バネ５、１５をバイメタル２、１２固定位置近傍のバイメタル２、１２上面とケース１、１１との間に設け、第二付勢バネ６、１６をバイメタル２、１２と負荷座３、１３との当接面近傍に負荷座３、１３下部とケース１、１１との間に設けた。第一付勢バネ５、１５、及び第二付勢バネ６、１６を設けることによって、過電流によってバイメタル２、１２が湾曲して掛合片４を押圧するのを助長することが可能である。又、バイメタル２、１２の力が掛合片４に上手く伝わらず、電路の遮断が正常に行われないという恐れを減らすことが可能である。
なお、付勢手段は本実施例に示すバネに限定されるものではなく、本発明の趣旨を変更しない範囲で適宜変更可能である。 Embodiments of the present invention will be described below.
An overcurrent tripping mechanism provided inside the case 1 and 11 of the circuit breaker, the overcurrent tripping mechanism is formed of a long plate and has one end fixed to the load seats 3 and 13 and the other end being free. formed by providing a bimetal 2, 12 consists lock plate 4 that drives pressed by the bimetal 2 and 12, the bimetal 2, 12 top and the case 1 of the first urging spring 5,15 bimetal 2,12 fixed position near , 11, and the second urging springs 6, 16 are provided near the contact surfaces between the bimetals 2 , 12 and the load seats 3, 13 between the load seats 3, 13 and the cases 1, 11. It was. By providing the first urging springs 5, 15 and the second urging springs 6, 16, it is possible to promote that the bimetal 2, 12 is bent and presses the engaging piece 4 due to overcurrent. In addition, it is possible to reduce the fear that the force of the bimetal 2 or 12 is not transmitted to the engaging piece 4 and the electric circuit is not normally cut off.
The biasing means is not limited to the spring shown in the present embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

以上のように、本発明の過電流引外し機構は、バイメタルの配置位置近傍にバイメタルの湾曲を助長する付勢手段を設けることによって、過電流が流れた際に電路の遮断を正常に行に行うようにしたものである。   As described above, the overcurrent tripping mechanism of the present invention provides a biasing means for promoting the bending of the bimetal in the vicinity of the arrangement position of the bimetal, so that the electric circuit is normally interrupted when an overcurrent flows. It is what I do.

本発明の実施例１における、過電流引外し機構の断面図である。It is sectional drawing of the overcurrent tripping mechanism in Example 1 of this invention. 本発明の実施例１における、Ａ部の拡大断面図である。It is an expanded sectional view of the A section in Example 1 of the present invention. 従来技術における、特許文献１に記載の過電流引外し機構の断面図である。It is sectional drawing of the overcurrent trip mechanism of patent document 1 in a prior art. 従来技術における、特許文献２に記載の過電流引外し機構の断面図である。It is sectional drawing of the overcurrent trip mechanism of patent document 2 in a prior art.

符号の説明Explanation of symbols

１、１１、２１、３１ ケース
２、１２、２２、３２ バイメタル
３、１３ 負荷座
４、２４、３４ 掛合片
５、１５ 第一付勢バネ
６、１６ 第二付勢バネ 1, 11, 21, 31 Case 2, 12, 22, 32 Bimetal 3, 13 Load seat 4, 24, 34 Engagement piece 5, 15 First biasing spring 6, 16 Second biasing spring

Claims (1)

回路遮断器のケース内部に設けられる過電流引外し機構であって、該過電流引外し機構は長板から形成されると共に一端を固定し、他端を自由に設けてなるバイメタルと、該バイメタルによって押圧駆動する掛合片とからなり、前記バイメタルの配置位置近傍に前記掛合片を押圧する方向に前記バイメタルを付勢する付勢手段を設けたことを特徴とする過電流引外し機構。 An overcurrent tripping mechanism provided inside a case of a circuit breaker, wherein the overcurrent tripping mechanism is formed of a long plate and has one end fixed and the other end freely provided, and the bimetal An overcurrent tripping mechanism comprising a latching piece that is pressed and driven by a biasing means that biases the bimetal in a direction in which the latching piece is pressed in the vicinity of the bimetal arrangement position.
JP2008104129A 2008-04-11 2008-04-11 Overcurrent trip mechanism Active JP5170661B2 (en)

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JP5170661B2 true JP5170661B2 (en) 2013-03-27

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3374472B2 (en) * 1993-10-29 2003-02-04 松下電工株式会社 Circuit breaker
JP2007087824A (en) * 2005-09-22 2007-04-05 Kawamura Electric Inc Circuit breaker

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