JP5403335B2 - Electromagnet structure of instantaneous trip device in circuit breaker - Google Patents
Electromagnet structure of instantaneous trip device in circuit breaker Download PDFInfo
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本発明は，回路遮断器における瞬時引外し装置の電磁石構造に関し，特に，低コストでありながらも，引外しに必要な所定のストロークを確保しつつ吸引効率を高めることができる電磁石構造に関するものである。 The present invention relates to an electromagnet structure of an instantaneous tripping device in a circuit breaker, and more particularly to an electromagnet structure capable of increasing suction efficiency while securing a predetermined stroke necessary for tripping at a low cost. is there.
従来，電磁石装置における吸引力を向上させる方法として，鉄芯の磁束飽和値を上げる方法や吸引断面積を大きくする方法が挙げられていた。ここで，鉄芯の磁束飽和値については，従来からその限界ぎりぎりで使用していたため，これ以上磁束飽和値を上げることは困難であり，また，吸引断面積については，電磁石自体の寸法が大きくなると共に重さも増大するという欠点があることが指摘されている（特許文献１）。 Conventionally, as a method for improving the attraction force in an electromagnet device, a method for increasing the magnetic flux saturation value of the iron core and a method for increasing the attraction sectional area have been cited. Here, since the magnetic flux saturation value of the iron core has been used to the limit, it has been difficult to increase the magnetic flux saturation value any more, and the size of the electromagnet itself is large for the attraction cross-sectional area. However, it has been pointed out that there is a drawback that the weight increases as well (Patent Document 1).
これらの欠点を解決するために，特許文献１において，電磁石自体の寸法や重さを増大させることなく，効果的に鉄芯の磁束飽和値を高め，ひいては電磁石の吸引力を向上させることを目的として，吸引用鉄芯の内部側磁束還流部の断面積が，可動鉄片に対し逆向きに次第に増大し，最大位置での断面積が該還流部の先端面積の２倍以上であることを特徴とした平板型電磁石を提供している。 In order to solve these drawbacks, Patent Document 1 aims to effectively increase the magnetic flux saturation value of the iron core and thus improve the attractive force of the electromagnet without increasing the size and weight of the electromagnet itself. The cross-sectional area of the inner-side magnetic flux return part of the suction iron core gradually increases in the opposite direction to the movable iron piece, and the cross-sectional area at the maximum position is more than twice the tip area of the return part. A flat plate type electromagnet is provided.
また，電磁石装置においては，その構造上，鉄芯と該鉄芯に吸着する可動鉄片との間に設けられる空隙の大きさにより吸引力が変化し，該空隙を小さくすることにより，吸引力が増加することは従来から知られていることである。しかしながら，空隙の大きさは，電磁石におけるストロークの大きさと関係しているため，当然のことながら，空隙が小さい場合には，ストロークも小さくなるため，ストロークを大きくした電磁石を提供する場合には不適であった。 Also, in the electromagnet device, the attractive force varies depending on the size of the gap provided between the iron core and the movable iron piece attracted to the iron core due to its structure, and the attractive force is reduced by reducing the gap. Increasing is what is known in the art. However, since the size of the gap is related to the stroke size of the electromagnet, it is natural that when the gap is small, the stroke is also small, so it is not suitable for providing an electromagnet with a large stroke. Met.
電磁石における吸引用鉄芯の内部側磁束還流部の断面積を，可動鉄片に対し逆向きに次第に増大させ，最大位置での断面積が該還流部の先端面積の２倍以上であることを特徴として電磁石を構成する場合，通常の電磁石と比べると各部品コストの増大が予想され，また，各々の部品の組み立て性を考えた場合，通常のコイルの巻き方に比べて巻き径が変動するため，新たな生産設備の投入が必要になるなど，安価大量に生産する場合にはコスト面で課題が残る。 The cross-sectional area of the magnetic flux return part on the inner side of the attracting iron core in the electromagnet is gradually increased in the opposite direction to the movable iron piece, and the cross-sectional area at the maximum position is more than twice the tip area of the return part. When the electromagnet is constructed, the cost of each part is expected to increase compared to a normal electromagnet, and the winding diameter varies compared to the normal coil winding method when considering the assembly of each part. However, there is a problem in terms of cost when producing a large quantity at a low cost, such as the need to introduce new production equipment.
また，所定のストロークが必要とされる電磁石を提供する場合，吸引力を向上させるために，単に前記空隙を小さくして構成した場合には，前記所定のストロークが得られないという課題があった。 Further, when providing an electromagnet that requires a predetermined stroke, there is a problem that the predetermined stroke cannot be obtained if the gap is simply made small in order to improve the attractive force. .
そこで，本発明は，電磁石の吸引力を向上させるにあたり，従来から開示されている鉄芯の磁束飽和値を上げる方法や吸引断面積を大きくする方法を採らず，また，電磁石における吸引用鉄芯の内部側磁束還流部の断面積を，可動鉄片に対し逆向きに次第に増大させ，最大位置での断面積が該還流部の先端面積の２倍以上であるとして形成せずとも，回路遮断器における過電流引外し装置以外の部分は従来と同等のものを用いることができ，低コストでありながらも，引外しに必要な所定のストロークを確保しつつ，しかも吸引効率を高めることが可能な回路遮断器の瞬時引外し装置における電磁石構造を提供することを目的とする。 Therefore, the present invention does not adopt a conventionally disclosed method for increasing the magnetic flux saturation value of the iron core or a method for increasing the suction cross-sectional area in order to improve the attractive force of the electromagnet. Even if the cross-sectional area of the inner-side magnetic flux return part is gradually increased in the opposite direction to the movable iron piece and the cross-sectional area at the maximum position is not more than twice the tip area of the return part, The parts other than the overcurrent tripping device can be the same as the conventional one, and it is possible to increase the suction efficiency while securing the predetermined stroke necessary for tripping at low cost. An object is to provide an electromagnet structure in an instantaneous tripping device of a circuit breaker.
上述の目的を達成するために，本発明の請求項１では，回路遮断器の電路を構成する導体を包囲するよう配設されるコの字状のヨークと，該ヨークの両開放端と所定量のギャップを設けて対向配置される平板状の可動鉄片と，該可動鉄片を取付保持するとともに可動鉄片が前記ギャップを閉じる方向若しくは開く方向に揺動するよう前記ヨークの両解放端近傍にそれぞれ設けられた軸受部により軸支される可動鉄片受と，該可動鉄片受を前記軸支点を揺動中心として前記ヨークと前記可動鉄片との前記ギャップを開く方向に付勢する弾性部材と，を備えた回路遮断器における瞬時引外し装置の電磁石構造であって，前記ヨークの両解放端近傍にそれぞれ設けられた軸受部のうち，一方の軸受部を前記ギャップが開く方向に他方の軸受部と比べて拡大形成することにより，前記弾性部材の付勢と相まって前記可動鉄片受の前記一方の軸受部における軸支点が前記拡大形成された部分に移動して，一方のギャップが他方のギャップに比べて狭く形成されることを特徴として回路遮断器における瞬時引外し装置の電磁石構造を提供したものである。 In order to achieve the above-mentioned object, according to claim 1 of the present invention, a U-shaped yoke disposed so as to surround a conductor constituting an electric circuit of a circuit breaker, and both open ends of the yoke are provided. A flat plate-shaped movable iron piece arranged to be opposed to each other with a fixed gap, and the movable iron piece is mounted and held near both open ends of the yoke so that the movable iron piece swings in the direction of closing or opening the gap. a movable iron piece receiving pivotally supported by a bearing portion provided, an elastic member for urging in a direction of opening the gap between the yoke and the movable iron piece the movable iron receiving as a swing around the axis fulcrum, the a electromagnetic structure of the instantaneous tripping device of the circuit breaker comprising, among the bearing portions provided on both open end near the yoke, and the other bearing part one of the bearing portion in the direction of opening said gap compared By enlarging form, go to part pivot point is the expanded form of biasing coupled with the one of the bearing portion of the movable iron piece receiving prior Symbol elastic member, one gap than the other of the gap The present invention provides an electromagnet structure for an instantaneous trip device in a circuit breaker characterized by being formed narrow.
前記可動鉄片を吸引し始めるために必要な吸引力について補足すると，該吸引力は，少なくとも前記弾性部材による可動鉄片の付勢力（付勢力をＦ１とする）以上の大きさが必要となる。所定のギャップ（ヨークの両開放端と可動鉄片とのそれぞれのギャップの大きさをＬ１，Ｌ１とする）を介した磁気回路において発生する吸引力（吸引力をＦとする）は，αを定数，Ｉを電流の大きさとして，Ｆ＝α×Ｉ２／（Ｌ１＋Ｌ１）２と表される。本発明のように，一方のギャップが他方のギャップに比べて狭く形成される場合においては，一方のギャップをＬ１´，他方のギャップをＬ１とすると，Ｌ１´＜Ｌ１であるから，磁気回路におけるギャップの大きさは，（Ｌ１´＋Ｌ１）＜（Ｌ１＋Ｌ１）という大小関係となり，一方のギャップが他方のギャップに比べて狭く形成される場合に発生する吸引力Ｆ´は，Ｆ´＝α×Ｉ２／（Ｌ１´＋Ｌ１）２と表され，電流の大きさが同じ場合では，発生する吸引力の大きさが大きくなる（Ｆ´＞Ｆ）。即ち，所定の大きさの吸引力を生じさせるために必要な電流Ｉの大きさは，通常と比べて小さくすることができる。なお，他方のギャップは大きさが変わらないため，引外し動作に必要なストロークは所定量保つことができる。これにより，引外しに必要な所定量のストロークを確保しつつ吸引効率を高めることができる電磁石構造を提供することができる。 Supplementing the suction force required to start sucking the movable iron piece, the suction force needs to be at least larger than the urging force of the movable iron piece by the elastic member (assuming the urging force is F1). The attractive force (attractive force is F) generated in a magnetic circuit through a predetermined gap (the sizes of the gaps between the open ends of the yoke and the movable iron pieces are L1 and L1) is expressed by α being a constant. , I is expressed as F = α × I 2 / (L1 + L1) 2 where I is the magnitude of the current. In the case where one gap is formed narrower than the other gap as in the present invention, if one gap is L1 ′ and the other gap is L1, then L1 ′ <L1. The size of the gap has a relationship of (L1 ′ + L1) <(L1 + L1), and the suction force F ′ generated when one gap is formed narrower than the other gap is F ′ = α × I. 2 / (L1 ′ + L1) 2 and when the currents are the same, the magnitude of the generated attractive force increases (F ′> F). That is, the magnitude of the current I required to generate a predetermined amount of attractive force can be made smaller than usual. Since the other gap does not change in size, the stroke required for the tripping operation can be maintained at a predetermined amount. As a result, it is possible to provide an electromagnet structure capable of enhancing the suction efficiency while securing a predetermined amount of stroke necessary for tripping.
また，前記弾性部材は，前記ヨークの両開放端近傍に設けられるそれぞれの軸受部のうち，前記一方の軸受部側に設けたことを特徴として電磁石を構成してもよい。 Further, the elastic member, among the respective bearing portions provided at both open ends near the yoke may be configured electromagnets as being provided in the bearing portion side of the one.
これにより，弾性部材が可動鉄片受の拡大形成された側に作用するため，軸受部における軸支点を前記拡大形成された部分に効率よく移動させることができる。 As a result, the elastic member acts on the side of the movable iron piece holder that is formed in an enlarged manner, so that the shaft fulcrum in the bearing portion can be efficiently moved to the enlarged portion.
また，前記回路遮断器における接点開閉機構に作用する前記電磁石装置の作用部は，前記ヨークの両解放端近傍にそれぞれ設けられた軸受部のうち，前記他方の軸受部側に形成されたことを特徴として電磁石を構成してもよい。 Further, the working portion of the electromagnetic device acting on the contact switching mechanism in the circuit breaker, in which among the bearing portions provided on both open end near the yoke, which is formed on the bearing portion side of the other An electromagnet may be configured as a feature.
これにより，作用部のストロークは，拡大形成された軸受部によるギャップの広狭の影響を受けず，引外しに必要な所定量のストロークを常に確保できる。 As a result, the stroke of the action portion is not affected by the width of the gap due to the enlarged bearing portion, and a predetermined amount of stroke required for tripping can always be secured.
また，前記一方の軸受部は，該一方の軸受け部をギャップが開く方向に他方の軸受け部と比べて拡大形成すると共に，前記一方の軸受部を長孔状に拡大形成されたことを特徴として形成されたことを特徴として電磁石を構成してもよい。 Further, the one bearing portion is characterized in that the one bearing portion is formed to be larger than the other bearing portion in a direction in which the gap is opened, and the one bearing portion is formed to be elongated in the shape of a long hole. You may comprise an electromagnet characterized by being formed.
これにより，軸受部を拡大形成する際に，一般的な打抜き加工等により形成が行え，なおかつ，軸支点の移動量の調節を簡易に行うことができ，低コストで引外しに必要な所定量のストロークを確保しつつ，吸引効率を高めることが可能な電磁石構造を提供することができる。 As a result, when the bearing part is enlarged, it can be formed by general punching, etc., and the amount of movement of the shaft fulcrum can be easily adjusted, and the predetermined amount required for tripping can be reduced at a low cost. Thus, it is possible to provide an electromagnet structure capable of increasing the suction efficiency while securing the stroke.
以上の如く，本発明によれば，電磁石の吸引力を向上させるにあたり，従来から開示されている鉄芯の磁束飽和値を上げる方法や吸引断面積を大きくする方法を採らず，また，電磁石における吸引用鉄芯の内部側磁束還流部の断面積を，可動鉄片に対し逆向きに次第に増大させ，最大位置での断面積が該還流部の先端面積の２倍以上であるとして形成せずとも，鉄芯や可動鉄片は従来と同等のものを用い低コストありながらも，引外しに必要な所定のストロークを確保しつつ，吸引効率を高めることが可能な電磁石構造を提供することができる。 As described above, according to the present invention, in order to improve the attractive force of the electromagnet, the conventionally disclosed method of increasing the magnetic flux saturation value of the iron core and the method of increasing the attractive cross-sectional area are not adopted. Even if the cross-sectional area of the magnetic flux return part on the inner side of the iron core for suction is gradually increased in the opposite direction with respect to the movable iron piece, the cross-sectional area at the maximum position is not required to be more than twice the tip area of the return part. Thus, it is possible to provide an electromagnet structure capable of increasing the suction efficiency while ensuring a predetermined stroke necessary for tripping, while using an iron core and a movable iron piece equivalent to the conventional one and low cost.
以下，本発明の実施の形態について，図面を用いて詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
まず，図１は，本実施形態に係る電磁石構造を回路遮断器における瞬時引外し装置に適用したもので，２極回路遮断器１００の要部斜視図を示したものである。 First, FIG. 1 shows a perspective view of a main part of a two-pole circuit breaker 100 in which the electromagnet structure according to this embodiment is applied to an instantaneous trip device in a circuit breaker.
図１において，回路遮断器１００の瞬時引外し装置１１０以外の部分は，一般的な瞬時引外し装置を備えた回路遮断器と同等のものを適用している。即ち，操作ハンドル１０１をオン，オフ操作することによって，該操作ハンドルとリンク機構などにより接続された開閉機構部１０２が連動して駆動され，さらに該開閉機構部１０２に接続された接点装置１０３が連動して駆動されて，電路を開閉するものである。 In FIG. 1, parts other than the instantaneous trip device 110 of the circuit breaker 100 are the same as those of a circuit breaker provided with a general instantaneous trip device. That is, when the operation handle 101 is turned on / off, the opening / closing mechanism 102 connected to the operation handle by a link mechanism or the like is driven in conjunction with each other, and the contact device 103 connected to the opening / closing mechanism 102 is further connected. It is driven in conjunction to open and close the electric circuit.
また，電路に過電流などの異常電流が発生した場合には，回路遮断器に備えられた過電流引外し装置１１０によって，過電流を検出し，過電流の大きさによって，時延引外し，若しくは瞬時引外しを行うよう該過電流引外し装置１１０の作用部が開閉機構部１０２に作用することにより，開閉機構部の引外し動作を行い，自動的に電路を遮断する。 Further, when an abnormal current such as an overcurrent occurs in the electric circuit, the overcurrent tripping device 110 provided in the circuit breaker detects the overcurrent, and depending on the magnitude of the overcurrent, the time delay trip or When the operating part of the overcurrent tripping device 110 acts on the opening / closing mechanism part 102 so as to perform instantaneous tripping, the opening / closing mechanism part is tripped and the electric circuit is automatically interrupted.
過電流引外し装置には，熱動電磁形や完全電磁形があり，本実施の形態では熱動電磁形の過電流引外し装置１１０を用いている。そして，熱動電磁形の過電流引外し装置１１０においては，電路に短絡電流よりも小さな過電流が発生した場合には，熱動素子であるバイメタルが撓んで開閉機構部に作用し，短絡電流が発生した場合には，電磁石を備えた瞬時引外し装置が駆動することにより開閉機構部に作用し，自動的に電路を遮断する。 The overcurrent tripping device includes a thermal electromagnetic type and a complete electromagnetic type. In this embodiment, a thermal electromagnetic type overcurrent tripping device 110 is used. In the thermal electromagnetic overcurrent tripping device 110, when an overcurrent smaller than the short-circuit current is generated in the electric circuit, the bimetal as the thermal element is bent and acts on the opening / closing mechanism, and the short-circuit current is generated. When this occurs, the instantaneous tripping device equipped with an electromagnet is driven to act on the open / close mechanism and automatically shut off the electric circuit.
前記接点装置１０３は，一端に接点が設けられた可動接触子１０３１と，該可動接触子１０３１と対向配置されて，同じく一端に接点が設けられた固定接触子１０３２とを備えて構成されている。このうち，固定接触子１０３２は回路遮断器１００のケース側に配設され，可動接触子１０３１は開閉機構部１０２に備えられるクロスバー１０４に装着されて，該クロスバー１０４が，前記操作ハンドル１０１の操作に連動して回動することにより，接点装置１０３が開閉駆動される。 The contact device 103 includes a movable contact 1031 provided with a contact at one end, and a fixed contact 1032 provided opposite to the movable contact 1031 and provided with a contact at one end. . Among these, the fixed contact 1032 is disposed on the case side of the circuit breaker 100, the movable contact 1031 is mounted on the cross bar 104 provided in the opening / closing mechanism 102, and the cross bar 104 is connected to the operation handle 101. The contact device 103 is driven to open and close by rotating in conjunction with the above operation.
過電流引外し装置１１０の開閉機構部１０２への作用は，開閉機構部に設けられた作動板に対して行われる。本実施の形態の場合，作動板１０５は，その一端が軸支されて，一定量回動自在に保持され，常時，軸支部に設けられた付勢ばねにより，後述するラッチ部における係合がなされる方向に付勢されている。 The operation of the overcurrent tripping device 110 on the opening / closing mechanism 102 is performed on an operation plate provided in the opening / closing mechanism. In the case of the present embodiment, one end of the operating plate 105 is pivotally supported and is held rotatably by a certain amount, and is always engaged by a biasing spring provided on the pivotal support portion in a later-described latch portion. It is biased in the direction made.
通常状態では，作動板１０５に設けられたラッチ部に，開閉機構部であるリンク機構の一部を構成するアーム１０６が係合されているが，過電流引外し装置の作用により，作動板が前記ラッチ部が外れる方向に回転していき，作動板の回転とともに係合が釈放された場合には，開閉機構部におけるバランスがくずれて，開閉機構部が引外し動作し，該開閉機構部が接点装置１０３を開極させ，回路遮断器１００は電路を遮断するよう動作する。 In a normal state, an arm 106 constituting a part of a link mechanism which is an opening / closing mechanism is engaged with a latch portion provided on the operation plate 105. However, the operation plate is moved by the action of an overcurrent trip device. When the latch part is rotated in the releasing direction and the engagement is released along with the rotation of the operating plate, the balance in the opening / closing mechanism part is lost, the opening / closing mechanism part is tripped, and the opening / closing mechanism part is The contact device 103 is opened, and the circuit breaker 100 operates to interrupt the electric circuit.
次に本実施の形態に係る瞬時引外し装置における電磁石構造について説明を行う。 Next, the electromagnet structure in the instantaneous tripping device according to the present embodiment will be described.
図２には過電流引外し装置１１０の斜視図を示した。該過電流引外し装置１１０は，回路遮断器の電路を構成する導体であるバイメタル１１０５を包囲するよう配設されるコの字状のヨーク１１０１と，該ヨーク１１０１の両開放端１１０１ａ，１１０１ｂと所定のギャップを設けて対向配置される平板状の可動鉄片１１０２と，該可動鉄片１１０２をカシメにより取付保持するとともに可動鉄片１１０２が前記ギャップを閉じる方向若しくは開く方向に揺動するよう軸受部１１０３ａ，１１０３ｂにより軸支される可動鉄片受１１０３と，可動鉄片受１１０３を前記軸支点を揺動中心としてヨーク１１０１と可動鉄片１１０２とのギャップを開く方向に付勢する弾性部材１１０６とを備えている。 FIG. 2 shows a perspective view of the overcurrent tripping device 110. The overcurrent tripping device 110 includes a U-shaped yoke 1101 disposed so as to surround a bimetal 1105 which is a conductor constituting an electric circuit of a circuit breaker, and both open ends 1101a and 1101b of the yoke 1101. A flat plate-shaped movable iron piece 1102 that is arranged to be opposed to each other with a predetermined gap, and a bearing portion 1103a that holds the movable iron piece 1102 by caulking and swings the movable iron piece 1102 in a closing direction or an opening direction. A movable iron piece holder 1103 that is pivotally supported by 1103b, and an elastic member 1106 that urges the movable iron piece holder 1103 in the direction of opening the gap between the yoke 1101 and the movable iron piece 1102 with the pivot point as the pivot center.
また，図３の電磁石装置の分解斜視図に示したように，可動鉄片受１１０３は，その軸受部１１０３ａ，１１０３ｂがヨーク１１０１の両開放端部に設けられた軸受部１１０１ａ，１１０１ｂと互いの孔部を合わせて軸１１０４が貫挿されることにより軸支される構造となっている。 Further, as shown in the exploded perspective view of the electromagnet device of FIG. 3, the movable iron piece receiver 1103 has the bearing portions 1103a and 1103b provided at both open ends of the yoke 1101 and the holes 1101a and 1101b. The shafts 1104 are inserted through the parts so that the shafts are supported.
可動鉄片受１１０３をギャップを開く方向に付勢する弾性部材１１０６には，トーションばねを使用しており，ばねの一端を折り曲げて，可動鉄片受の端部に設けた孔部に引掛けることにより，前記軸受部を回動中心として，常時ギャップが開く方向に付勢力が得られるように構成している。 A torsion spring is used for the elastic member 1106 that urges the movable iron piece holder 1103 in the direction of opening the gap, and one end of the spring is bent and hooked into a hole provided at the end of the movable iron piece holder. The urging force is always obtained in the direction in which the gap is opened with the bearing portion as the center of rotation.
前記可動鉄片受１１０３の軸受部のうち，一方の軸受部１１０３ａは，他方の軸受部１１０３ｂと比べて，ギャップが開く方向に拡大形成している。より詳しくは，図４の（ｈ）に示した瞬時引外し装置の平面図のように，可動鉄片１１０３がヨーク１１０１に吸着したときの状態において，軸１１０４の右側部分，即ちギャップが開く方向に軸受部１１０３ａを長孔状に拡大して形成している。 Among the bearing portions of the movable iron piece holder 1103, one bearing portion 1103a is formed so as to expand in the direction in which the gap opens as compared with the other bearing portion 1103b. More specifically, in the state where the movable iron piece 1103 is attracted to the yoke 1101, as shown in the plan view of the instantaneous tripping device shown in FIG. The bearing portion 1103a is formed in an elongated hole shape.
可動鉄片受１１０３は，弾性部材１１０６により常時ギャップが開く方向に付勢されているから，通常状態においては，可動鉄片受１１０３は，図４の（ｂ）のように，長孔状に拡大形成された軸受部における内周部の右側に軸１１０４が位置するよう引き寄せられる。即ち，弾性部材の付勢と相まって可動鉄片受の軸支点が前記拡大形成された部分に移動して，一方のギャップが他方のギャップに比べて狭く形成される配置となる。 Since the movable iron piece receiver 1103 is always urged by the elastic member 1106 in the direction in which the gap is opened, in a normal state, the movable iron piece holder 1103 is formed in an elongated shape as shown in FIG. The shaft 1104 is drawn so as to be positioned on the right side of the inner peripheral portion of the bearing portion. That is, in combination with the biasing of the elastic member, the pivot point of the movable iron piece holder moves to the enlarged portion, and one gap is formed narrower than the other gap.
また，可動鉄片１１０２には，回路遮断器の開閉機構部１０２における作動板１０５に作用する作用部１１０２ａが突出形成されている。該作用部１１０２ａは，可動鉄片受１１０３における両方の軸受部のうち，拡大形成された軸受部１１０３ａとは反対側の軸受部１１０３ｂ側に設けられる。 Further, the movable iron piece 1102 is formed with a projecting portion 1102a that acts on the operation plate 105 in the switching mechanism portion 102 of the circuit breaker. The action part 1102a is provided on the bearing part 1103b side opposite to the enlarged bearing part 1103a, out of both bearing parts in the movable iron piece receiver 1103.
次に，過電流引外し装置１１０における電磁石の動作について説明を行う。 Next, the operation of the electromagnet in the overcurrent tripping device 110 will be described.
まず，前記可動片１０２を吸引し始めるために必要な吸引力は，前述のように，少なくとも前記弾性部材による可動鉄片の付勢力（付勢力をＦ１とする）以上の大きさが必要となる。所定のギャップ（ヨークの両開放端と可動鉄片とのそれぞれのギャップの大きさをＬ１，Ｌ１とする）を介した磁気回路において発生する吸引力（吸引力をＦとする）は，αを定数，Ｉを電流の大きさとして，Ｆ＝α×Ｉ２／（Ｌ１＋Ｌ１）２と表される。 First, the suction force necessary to start sucking the movable piece 102 needs to be at least as large as the urging force of the movable iron piece by the elastic member (assuming the urging force is F1) as described above. The attractive force (attractive force is F) generated in a magnetic circuit through a predetermined gap (the sizes of the gaps between the open ends of the yoke and the movable iron pieces are L1 and L1) is expressed by α being a constant. , I is expressed as F = α × I 2 / (L1 + L1) 2 where I is the magnitude of the current.
本発明のように，一方のギャップが他方のギャップに比べて狭く形成される場合においては，一方のギャップをＬ１´，他方のギャップをＬ１とすると，Ｌ１´＜Ｌ１であるから，磁気回路におけるギャップの大きさは，（Ｌ１´＋Ｌ１）＜（Ｌ１＋Ｌ１）という大小関係となり，一方のギャップが他方のギャップに比べて狭く形成される場合に発生する吸引力Ｆ´は，Ｆ´＝α×Ｉ２／（Ｌ１´＋Ｌ１）２と表され，電流の大きさが同じ場合では，発生する吸引力の大きさが大きくなる（Ｆ´＞Ｆ）。即ち，所定の大きさの吸引力を生じさせるために必要な電流Ｉの大きさは，通常と比べて小さくすることができる。 In the case where one gap is formed narrower than the other gap as in the present invention, if one gap is L1 ′ and the other gap is L1, then L1 ′ <L1. The size of the gap has a relationship of (L1 ′ + L1) <(L1 + L1), and the suction force F ′ generated when one gap is formed narrower than the other gap is F ′ = α × I. 2 / (L1 ′ + L1) 2 and when the currents are the same, the magnitude of the generated attractive force increases (F ′> F). That is, the magnitude of the current I required to generate a predetermined amount of attractive force can be made smaller than usual.
これらのギャップ（Ｌ１＋Ｌ１），（Ｌ１´＋Ｌ１）と吸引力の関係を図６に示した。即ち，ギャップが小さくなるとともに，吸引力は大きくなる特性を示す。 The relationship between these gaps (L1 + L1) and (L1 ′ + L1) and the suction force is shown in FIG. That is, the suction force increases as the gap decreases.
また，前記ギャップがそれぞれの大きさの場合について，吸引力がＦ１に達するまでの該吸引力と電流Ｉの関係を図６に示した。ギャップの大きさが（Ｌ１＋Ｌ１）の場合に，吸引力がＦ１の大きさに達する電流値をＩ１として，ギャップの大きさが（Ｌ１´＋Ｌ１）の場合に，吸引力がＦ１の大きさに達する電流値をＩ２とすると，Ｉ１＞Ｉ２の関係となる。即ち，所定の吸引力Ｆ１を生じさせるのに必要な電流Ｉの大きさは，ギャップの大きさに比例するから，電流の大きさが同じ場合には，ギャップが狭いほうが大きな吸引力を発生させることができる。 FIG. 6 shows the relationship between the attraction force and the current I until the attraction force reaches F1 when the gap is of each size. When the gap size is (L1 + L1), the current value at which the suction force reaches the magnitude of F1 is I1, and when the gap size is (L1 ′ + L1), the suction force reaches the magnitude of F1. Assuming that the current value is I2, I1> I2. That is, since the magnitude of the current I required to generate the predetermined attractive force F1 is proportional to the size of the gap, when the current is the same, a larger attractive force is generated when the gap is narrower. be able to.
次に，図５を用いて，可動鉄片１１０２の動作について説明を行う。 Next, the operation of the movable iron piece 1102 will be described with reference to FIG.
図５（ａ），（ｂ），（ｃ）は，瞬時引外し装置における通常状態を示すもので，それぞれ，電磁石の平面図，正面図，背面図を示したものである。ヨーク１１０１の開放端と可動鉄片１１０２とがなす角度は１３度とし，所定量のストロークが得られる構成としている。また，（ｇ），（ｈ），（ｉ）は，瞬時引外し装置が駆動し，可動鉄片１１０３がヨーク１１０１に吸着した状態を示したものである。（ｄ），（ｅ），（ｆ）はその途中の状態を示したものであり，ヨーク１１０１の開放端と可動鉄片１１０２とがなす角度が６度の場合を示している。また，何れの図においても簡略のため導体，弾性部材は省略している。 FIGS. 5A, 5B, and 5C show a normal state in the instantaneous tripping device, and show a plan view, a front view, and a rear view of the electromagnet, respectively. The angle formed by the open end of the yoke 1101 and the movable iron piece 1102 is 13 degrees, and a predetermined amount of stroke is obtained. Further, (g), (h), and (i) show the state where the instantaneous trip device is driven and the movable iron piece 1103 is attracted to the yoke 1101. (D), (e), and (f) show the state in the middle, and show the case where the angle formed by the open end of the yoke 1101 and the movable iron piece 1102 is 6 degrees. In both figures, conductors and elastic members are omitted for simplicity.
さて，通常状態において，回路遮断器の導体に短絡電流が流れた場合，電磁誘導により，ヨーク１１０１に可動鉄片１１０２が吸引され始める。前述の磁気回路における吸引力が，弾性部材の付勢力を上回った場合には，可動鉄片１１０２が弾性部材の付勢力に抗して駆動し始める。このとき，可動鉄片受１１０３における軸受部１１０３ａに着目すると，軸１１０４の位置は，当初の長孔状に拡大形成された軸受部における内周部の右側から，相対的に左側に移動していく（図５の（ｅ）参照）。 In the normal state, when a short-circuit current flows through the conductor of the circuit breaker, the movable iron piece 1102 starts to be attracted to the yoke 1101 by electromagnetic induction. When the attraction force in the magnetic circuit exceeds the biasing force of the elastic member, the movable iron piece 1102 starts to be driven against the biasing force of the elastic member. At this time, paying attention to the bearing portion 1103a in the movable iron piece holder 1103, the position of the shaft 1104 moves relatively to the left side from the right side of the inner peripheral portion of the bearing portion that is initially formed in the shape of a long hole. (See (e) in FIG. 5).
より詳しくは，可動鉄片１１０２がヨーク１１０１に吸着されるにあたり，ヨークの開放端部と可動鉄片とが当接すると（図５における（ｂ）Ｓ点参照），該Ｓ点を回転中心としてギャップが狭くなる方向に回転を行うため，だんだんと軸１１０４の位置は，当初の長孔状に拡大形成された軸受部における内周部の右側から，相対的に左側に移動していく。図５の（ａ），（ｄ），（ｇ）を比較すると，ヨーク１１０１の開放端部と可動鉄片１１０２との成す角α，β，γの大きさは，通常状態から可動鉄片１１０２が吸引されるとともにだんだんと小さくなり，可動鉄片１１０２は，ヨーク１１０１に吸着されるまでの過程で，軸受部１１０３ａの内周部における軸１１０４の相対的な移動とともにギャップＬ１´とＬ１との差が小さくなるよう動作を行う。 More specifically, when the movable iron piece 1102 is attracted to the yoke 1101 and the open end of the yoke comes into contact with the movable iron piece (see (b) S point in FIG. 5), a gap is formed with the S point as a rotation center. In order to rotate in the narrowing direction, the position of the shaft 1104 gradually moves to the left from the right side of the inner peripheral part of the bearing part that is initially formed in the shape of a long hole. When comparing (a), (d), and (g) in FIG. 5, the angles α, β, and γ formed by the open end of the yoke 1101 and the movable iron piece 1102 are determined by the movable iron piece 1102 from the normal state. In the process until the movable iron piece 1102 is attracted to the yoke 1101, the difference between the gaps L1 ′ and L1 becomes smaller along with the relative movement of the shaft 1104 in the inner peripheral portion of the bearing portion 1103a. The operation is performed.
そして，可動鉄片１１０２がヨークの両開放端に吸着した場合には，軸１１０４は軸受部を拡大形成する前の本来の位置である前記内周部の左側に位置することとなる。 When the movable iron piece 1102 is attracted to both open ends of the yoke, the shaft 1104 is positioned on the left side of the inner peripheral portion, which is the original position before the bearing portion is enlarged.
これにより，ヨーク１１０１の両開放端１１０１ａ，１１０１ｂと可動鉄片１１０２とのギャップのうち，長孔状に拡大形成された軸受部側のギャップ（Ｌ１´）が他方のギャップ（Ｌ１）に比べて狭くなっているため，両方のギャップがＬ１，Ｌ１である場合と比べて，同じ大きさの電流により発生する吸引力が大きくなる。その一方で，作用部１１０２ａが設けられた側のギャップは所定量のストロークが得られるよう確保されており，しかも，軸受部１１０３ａの内周部を相対的に軸１１０４が自由に移動できるよう構成しているから，可動鉄片１１０２がヨーク１１０１に吸着される場合の動作を妨げることなく電磁石を駆動することができる。 As a result, of the gaps between the open ends 1101a and 1101b of the yoke 1101 and the movable iron piece 1102, the gap (L1 ′) on the bearing portion side formed in a long hole shape is narrower than the other gap (L1). Therefore, as compared with the case where both gaps are L1 and L1, the attractive force generated by the same current is increased. On the other hand, the gap on the side where the action portion 1102a is provided is secured so that a predetermined amount of stroke can be obtained, and the shaft 1104 can be moved relatively freely along the inner peripheral portion of the bearing portion 1103a. Therefore, the electromagnet can be driven without hindering the operation when the movable iron piece 1102 is attracted to the yoke 1101.
このように，本実施の形態における電磁石の一方のギャップ（Ｌ１´）は，長孔状に拡大形成された軸受部１１０１ａにより，通常状態では他方のギャップ（Ｌ１）よりも小さくなる。そして電磁石が駆動して，最終的に可動鉄片１１０２がヨーク１１０１に吸着する際には，他方の軸受部１１０１ｂと同様の軸位置となり，当初のギャップ（Ｌ１）の大きさ分だけ可動鉄片１１０２が移動するため，所定量のストロークの確保は行うことができるため，回路遮断器における過電流引外し装置以外の部分は従来と同等のものを用いることができ，低コストありながらも，引外しに必要な所定のストロークを確保しつつ，吸引効率を高めることが可能な電磁石構造を提供することができる。 As described above, one gap (L1 ′) of the electromagnet in the present embodiment is smaller than the other gap (L1) in the normal state due to the bearing portion 1101a formed in an elongated shape. Then, when the electromagnet is driven and finally the movable iron piece 1102 is attracted to the yoke 1101, the axial position is the same as that of the other bearing portion 1101b, and the movable iron piece 1102 is the same as the initial gap (L1). Because it moves, it is possible to secure a predetermined amount of stroke, so the parts other than the overcurrent tripping device in the circuit breaker can be the same as the conventional one, and it can be used for tripping at low cost. It is possible to provide an electromagnet structure capable of increasing the suction efficiency while ensuring a necessary predetermined stroke.
なお，本発明は，実施の形態に限定されることなく，発明の要旨を逸脱しない限りにおいて，適宜，必要に応じて，改良や設計変更は自由であり，例えば，可動鉄片受１１０３において拡大形成された軸受部１１０３ａの形状は，長孔状の他，孔の直径を他方よりも大きくして形成した円や楕円状として形成しても良いし，また，可動鉄片受１１０３の軸受部を拡大形成するのではなく，ヨーク１１０１の軸受部を拡大形成して構成してもよい。 It should be noted that the present invention is not limited to the embodiment, and can be freely improved and modified as necessary without departing from the gist of the invention. For example, the movable iron piece holder 1103 is enlarged and formed. The shape of the bearing 1103a formed may be a long hole, a circle or an ellipse formed with a hole diameter larger than the other, and the bearing of the movable iron piece holder 1103 may be enlarged. Instead of forming, the bearing portion of the yoke 1101 may be formed enlarged.
この他，軸１１０４を削減するために，ヨーク１１０１の軸受部１１０１ａ，１１０１ｂの部分にプロジェクション加工を施して突出部を形成して，可動鉄片受１１０３の軸受部の形状を軸を嵌め込み可能な程度に一部を開放したＵ字状に形成して，前記突出部を嵌め合わせて瞬時引外し装置を構成してもよい。また，弾性部材にはトーションばねの他，つるまきばねを用いた構成や，可撓性を備えた撓み片により可動鉄片をギャップを広げる方向に付勢させる構成としてもよい。 In addition, in order to reduce the shaft 1104, a projection is formed on the bearing portions 1101a and 1101b of the yoke 1101 to form a protruding portion, and the shape of the bearing portion of the movable iron piece holder 1103 can be fitted into the shaft. It may be formed in a U shape with a part opened, and the protruding portion may be fitted to constitute an instantaneous trip device. Moreover, it is good also as a structure which used the helical spring other than the torsion spring as an elastic member, or urged | biased a movable iron piece in the direction which expands a gap with the bending piece provided with flexibility.
さらには，可動鉄片１１０２を軸支する軸支部を，回路遮断器のケース内壁に形成して可動鉄片１１０２が揺動できるよう回路遮断器を構成してもよい。また，可動鉄片の形状は平板状の他，コの字形状に形成して，ヨーク側を平板形状，もしくはヨーク，可動鉄片ともにコの字形状に形成してもよい。 Furthermore, the circuit breaker may be configured so that the movable iron piece 1102 can be swung by forming a shaft support portion for pivotally supporting the movable iron piece 1102 on the inner wall of the case of the circuit breaker. Further, the shape of the movable iron piece may be a U shape other than the flat plate shape, and the yoke side may be formed into a flat plate shape, or both the yoke and the movable iron piece may be formed in a U shape.
本発明は，所定のストロークを必要としつつ，駆動電流が小さくても効率的に駆動できる電磁石構造を提供するため，過電流引外し装置を備える種々の回路遮断器に適用可能である。特に，電磁石装置を大型化することなく電磁石を構成できるため，小型の回路遮断器への適用が効果的である。また，比較的小さな短絡電流の領域においても駆動動作が可能であるため，コード保護機能を備える回路遮断器への適用が可能である。また，複雑な形状をした部品を使用する必要がないため，回路遮断器の組み立てにおいて，自動化を行う際にも有効であり，より一層の生産性向上を望むことができる。
The present invention is applicable to various circuit breakers equipped with an overcurrent tripping device in order to provide an electromagnet structure that requires a predetermined stroke and can be driven efficiently even if the drive current is small. In particular, since the electromagnet can be configured without increasing the size of the electromagnet device, application to a small circuit breaker is effective. In addition, since the driving operation is possible even in a region of a relatively small short-circuit current, it can be applied to a circuit breaker having a cord protection function. In addition, since it is not necessary to use parts having complicated shapes, it is effective for automation in the assembly of circuit breakers, and further improvement in productivity can be desired.
１００ 回路遮断器
１０１ 操作ハンドル
１０２ 開閉機構
１０３ 接点装置
１０４ クロスバー
１０５ 作動板
１０６ アーム
１１０ 過電流引外し装置
１１０１ ヨーク
１１０２ 可動鉄片
１１０３ 可動鉄片受
１１０４ 軸
１１０５ 導体
１１０６ 弾性部材
DESCRIPTION OF SYMBOLS 100 Circuit breaker 101 Operation handle 102 Opening and closing mechanism 103 Contact device 104 Crossbar 105 Actuating plate 106 Arm 110 Overcurrent tripping device 1101 Yoke 1102 Movable iron piece 1103 Movable iron piece receiver 1104 Shaft 1105 Conductor 1106 Elastic member
Claims (4)
該ヨークの両開放端と所定量のギャップを設けて対向配置される平板状の可動鉄片と，
該可動鉄片を取付保持するとともに可動鉄片が前記ギャップを閉じる方向若しくは開く方向に揺動するよう前記ヨークの両解放端近傍にそれぞれ設けられた軸受部により軸支される可動鉄片受と，
該可動鉄片受を前記軸支点を揺動中心として前記ヨークと前記可動鉄片との前記ギャップを開く方向に付勢する弾性部材と，
を備えた回路遮断器における瞬時引外し装置の電磁石装置であって，
前記ヨークの両解放端近傍にそれぞれ設けられた軸受部のうち，
一方の軸受部を前記ギャップが開く方向に他方の軸受部と比べて拡大形成することにより，
前記弾性部材の付勢と相まって，前記可動鉄片受の前記一方の軸受部における軸支点が前記拡大形成された部分に移動して，一方のギャップが他方のギャップに比べて狭く形成されることを特徴とする回路遮断器における瞬時引外し装置の電磁石装置。
A U-shaped yoke arranged so as to surround a conductor constituting an electric circuit of the circuit breaker;
A flat plate-shaped movable iron piece arranged opposite to both the open ends of the yoke with a predetermined amount of gap;
A movable iron piece holder supported and supported by bearing portions provided in the vicinity of both open ends of the yoke so that the movable iron piece swings in a direction to close or open the gap,
An elastic member for biasing the movable iron receiving in the direction of opening the gap between the armature and the yoke as a swing around the shaft fulcrum,
An electromagnetic device for an instantaneous trip device in a circuit breaker equipped with
Of the bearing portions provided in the vicinity of both open ends of the yoke,
By the one bearing portion is enlarged form in comparison with the other bearing part in the direction of opening said gap,
Coupled with the urging of said resilient member, to move the portion pivot point is the larger formation in the one bearing portion of the movable iron piece receiving, that one gap is formed narrower than the other gap An electromagnet device for an instantaneous trip device in a circuit breaker.
前記ヨークの両開放端近傍に設けられるそれぞれの軸受部のうち，前記一方の軸受部側に設けたことを特徴とする請求項１記載の回路遮断器における瞬時引外し装置の電磁石装置。
The elastic member is
Of each of the bearing portions provided at both open ends near the yoke, the electromagnetic device of the instantaneous tripping device of the circuit breaker according to claim 1, characterized in that provided on the bearing portion side of the one.
前記ヨークの両解放端近傍にそれぞれ設けられた軸受部のうち，前記他方の軸受部側に形成されたことを特徴とする請求項２記載の回路遮断器における瞬時引外し装置の電磁石装置。
Acting portion which acts on the contact switching mechanism in the circuit breaker of the electromagnet device,
3. The electromagnet device for an instantaneous trip device in a circuit breaker according to claim 2, wherein the electromagnet device is formed on the side of the other bearing portion among the bearing portions provided in the vicinity of both open ends of the yoke .
該一方の軸受け部をギャップが開く方向に他方の軸受け部と比べて拡大形成すると共に，前記一方の軸受部を長孔状に拡大形成されたことを特徴とする請求項１乃至請求項３記載のうち何れか１項に記載の回路遮断器における瞬時引外し装置の電磁石装置。
The one bearing part is
4. The first bearing part according to claim 1 , wherein the one bearing part is formed in an enlarged manner in the gap opening direction as compared with the other bearing part, and the one bearing part is formed in an elongated hole shape. The electromagnet apparatus of the instantaneous trip apparatus in the circuit breaker of any one of these.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009097919A JP5403335B2 (en) | 2009-04-14 | 2009-04-14 | Electromagnet structure of instantaneous trip device in circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009097919A JP5403335B2 (en) | 2009-04-14 | 2009-04-14 | Electromagnet structure of instantaneous trip device in circuit breaker |
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| JP2010251049A JP2010251049A (en) | 2010-11-04 |
| JP5403335B2 true JP5403335B2 (en) | 2014-01-29 |
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| JP6928389B2 (en) * | 2019-03-20 | 2021-09-01 | テンパール工業株式会社 | Circuit breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61279028A (en) * | 1985-06-04 | 1986-12-09 | 富士電機株式会社 | Overcurrent tripper for circuit breaker |
| JP2861446B2 (en) * | 1991-03-07 | 1999-02-24 | 富士電機株式会社 | Electromagnetic trip device for circuit breaker |
| JPH1125840A (en) * | 1997-06-30 | 1999-01-29 | Toshiba Fa Syst Eng Kk | Circuit breaker |
| JP2001068009A (en) * | 1999-08-26 | 2001-03-16 | Matsushita Electric Works Ltd | Electromagnetic tripping device of circuit breaker |
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