JP6584216B2 - Circuit breaker instantaneous trip device - Google Patents
Circuit breaker instantaneous trip device Download PDFInfo
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- JP6584216B2 JP6584216B2 JP2015162433A JP2015162433A JP6584216B2 JP 6584216 B2 JP6584216 B2 JP 6584216B2 JP 2015162433 A JP2015162433 A JP 2015162433A JP 2015162433 A JP2015162433 A JP 2015162433A JP 6584216 B2 JP6584216 B2 JP 6584216B2
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Description
本発明は、回路遮断器の瞬時引き外し装置の改良に関するものである。 The present invention relates to an improvement in an instantaneous tripping device for a circuit breaker.
回路遮断器には、熱動式の引き外し装置と、電磁式の引き外し装置とが組み込まれている（特許文献１）。 The circuit breaker incorporates a thermal trip device and an electromagnetic trip device (Patent Document 1).
熱動式の引き外し装置は、電路となるバイメタルに過大電流が流れたときにバイメタルが変形し、トリガプレートを動かしてラッチの係止を解除し、トリップ動作を行わせるものである。また電磁式の引き外し装置は、電路となるバイメタルに短絡電流のような大電流が流れたときに発生する磁束により固定ヨークを磁化させ、固定ヨークに隣接配置された可動ヨークを瞬時に引きよせてトリガプレートを動かし、ラッチの係止を解除し、トリップ動作を行わせるものである。 In the thermal tripping device, when an excessive current flows through the bimetal serving as an electric path, the bimetal is deformed, the trigger plate is moved to release the latch, and a trip operation is performed. In addition, the electromagnetic trip device magnetizes the fixed yoke by the magnetic flux generated when a large current such as a short-circuit current flows through the bimetal serving as the electric circuit, and instantaneously pulls the movable yoke arranged adjacent to the fixed yoke. The trigger plate is moved, the latch is released, and the trip operation is performed.
工業用制御装置の安全規格（ＵＬ５０８）により、定格電流の６００％以上の電流が流れたときに必要な引き外し時間が定められており、このような場合には電磁式の引き外し装置により、回路が瞬時に遮断されるようになっている。 According to the safety standard for industrial control devices (UL508), a trip time required when a current of 600% or more of the rated current flows is determined. In such a case, an electromagnetic trip device The circuit is interrupted instantaneously.
ところが、電流によって発生する磁界の強さは、電流に比例する。このため、定格電流が小さい回路遮断器においては、定格電流の６００％以上の電流が流れたとしても磁界は弱く、可動ヨークを引き寄せる力も小さくなるために、確実に回路を遮断できない可能性があった。 However, the strength of the magnetic field generated by the current is proportional to the current. For this reason, in a circuit breaker with a small rated current, even if a current of 600% or more of the rated current flows, the magnetic field is weak and the force that pulls the movable yoke is small, so there is a possibility that the circuit cannot be cut off reliably. It was.
また、固定ヨークと可動ヨークとの間には作動用のギャップが形成されているため、これも可動ヨークを引き寄せる力を低下させる原因となっている。 In addition, since an operating gap is formed between the fixed yoke and the movable yoke, this also causes a decrease in the force for pulling the movable yoke.
従って本発明の目的は上記した従来の問題点を解決し、定格電流が小さい回路遮断器においても、確実に瞬時遮断を行わせることができる回路遮断器の瞬時引き外し装置を提供することである。 Accordingly, an object of the present invention is to provide an instantaneous trip device for a circuit breaker that solves the above-described conventional problems and can reliably perform an instantaneous break even in a circuit breaker having a small rated current. .
上記の課題を解決するためになされた本発明は、固定ヨークと、その内部に配置された電路と、固定ヨークに隣接させて配置された可動ヨークとからなる回路遮断器の瞬時引き外し装置において、前記電路はバイメタルであり、磁性部材をバイメタルと一体に固定することにより、電路と固定ヨーク間、または電路と可動ヨーク間の少なくとも一方に、磁性部材を配置したことを特徴とするものである。 The present invention made in order to solve the above problems is an instantaneous tripping device for a circuit breaker comprising a fixed yoke, an electric circuit disposed therein, and a movable yoke disposed adjacent to the fixed yoke. The electric circuit is a bimetal, and the magnetic member is fixed integrally with the bimetal so that the magnetic member is disposed between at least one of the electric circuit and the fixed yoke or between the electric circuit and the movable yoke. .
本発明の回路遮断器の瞬時引き外し装置は、磁性部材により固定ヨークと可動ヨーク間の磁束を強くし、可動ヨークを固定ヨークに引き寄せる吸引力を高めることができる。このため、定格電流が小さい回路遮断器であっても確実に瞬時引き外し動作を行わせることができる。 The instantaneous tripping device for a circuit breaker according to the present invention can strengthen the magnetic flux between the fixed yoke and the movable yoke by the magnetic member, and can increase the attractive force for attracting the movable yoke to the fixed yoke. For this reason, even if it is a circuit breaker with a small rated current, an instantaneous trip operation can be reliably performed.
また本発明によれば、磁性部材をバイメタルと一体に固定したので、回路遮断器への組付けが容易となる。 Further, according to the present invention , since the magnetic member is fixed integrally with the bimetal, the assembly to the circuit breaker is facilitated.
以下に本発明の実施形態を説明する。
図１は回路遮断器の内部機構の説明図であり、１は電路となるバイメタル、２はバイメタル１を囲むように配置された断面がコ字型の固定ヨーク、３は固定ヨーク２に隣接配置された可動ヨーク、４はバイメタル１の先端に設けられた調節ねじ、５はバイメタル１が変形したときに調節ねじ４によって動かされるトリガープレート、６はトリガープレート５に係止されるラッチである。８は、可動ヨーク２の動作に連動して回動する補助金具である。
Embodiments of the present invention will be described below.
FIG. 1 is an explanatory diagram of an internal mechanism of a circuit breaker. 1 is a bimetal serving as an electric circuit, 2 is a U-shaped fixed yoke arranged so as to surround the bimetal 1, and 3 is disposed adjacent to the fixed yoke 2 The movable yoke 4 is an adjustment screw provided at the tip of the bimetal 1, 5 is a trigger plate that is moved by the adjustment screw 4 when the bimetal 1 is deformed, and 6 is a latch that is locked to the trigger plate 5. Reference numeral 8 denotes an auxiliary metal fitting that rotates in conjunction with the operation of the movable yoke 2.
熱動式の引き外し装置を構成するバイメタル１は、電路に過電流が流れると徐々に湾曲してトリガープレート５を動かしラッチ６を外して公知の引き外し機構を動作させ、回路を遮断する。 The bimetal 1 constituting the thermal tripping device is gradually bent when an overcurrent flows in the electric circuit, moves the trigger plate 5 and removes the latch 6 to operate a known tripping mechanism, thereby interrupting the circuit.
また、バイメタル１と固定ヨーク２と可動ヨーク３は電磁式の引き外し装置を構成するものであり、電路であるバイメタル１に短絡電流などの大電流が流れると、その電流により発生する磁束が固定ヨーク２と可動ヨーク３を磁化させて可動ヨーク３が固定ヨーク２に吸着される。図５に示すように、可動ヨーク３は軸７により固定ヨーク２に枢着されているため、可動ヨーク３が固定ヨーク２に引き寄せられると補助金具８の上端部８ａがトリガープレート５を動かし、同様に回路を遮断する。なお、電磁式の引き外し装置の電路はバイメタル１である必要はなく、より線によって電路を形成する。 The bimetal 1, the fixed yoke 2 and the movable yoke 3 constitute an electromagnetic trip device. When a large current such as a short circuit current flows through the bimetal 1 which is an electric circuit, the magnetic flux generated by the current is fixed. The yoke 2 and the movable yoke 3 are magnetized so that the movable yoke 3 is attracted to the fixed yoke 2. As shown in FIG. 5, since the movable yoke 3 is pivotally attached to the fixed yoke 2 by the shaft 7, when the movable yoke 3 is drawn to the fixed yoke 2, the upper end portion 8 a of the auxiliary metal fitting 8 moves the trigger plate 5, Similarly, the circuit is shut off. The electric circuit of the electromagnetic tripping device does not need to be the bimetal 1, and the electric circuit is formed by a stranded wire.
これらの熱動式の引き外し装置及び電磁式の引き外し装置の作動は従来と同様であるが、以下に説明するように、本発明では電磁式の引き外し装置に従来になかった磁性部材９を組み込み、電路を流れる電流値が比較的小さい場合にも確実に可動ヨーク３が固定ヨーク２に引き寄せられるようにした。 The operations of these thermal tripping devices and electromagnetic tripping devices are the same as in the prior art. However, as will be described below, in the present invention, the magnetic member 9 which is not in the past in the electromagnetic tripping device. The movable yoke 3 is surely attracted to the fixed yoke 2 even when the current value flowing through the electric circuit is relatively small.
図２から図５は本発明の第１の実施形態を示すもので、平板状の磁性部材９が電路であるバイメタル１と固定ヨーク２との間に配置されている。磁性部材９は鉄、フェライト等の透磁性に優れた材料からなる。図３、図４に示すように、この実施形態では磁性部材９はバイメタル１と固定ヨーク２の下部１０に固定されている。なお、可動ヨーク３が固定された補助金具８は固定ヨーク２から離れる方向に、ばね１１により付勢されている。 2 to 5 show a first embodiment of the present invention, in which a flat magnetic member 9 is disposed between a bimetal 1 serving as an electric path and a fixed yoke 2. The magnetic member 9 is made of a material having excellent magnetic permeability such as iron or ferrite. As shown in FIGS. 3 and 4, in this embodiment, the magnetic member 9 is fixed to the lower part 10 of the bimetal 1 and the fixed yoke 2. The auxiliary metal fitting 8 to which the movable yoke 3 is fixed is biased by a spring 11 in a direction away from the fixed yoke 2.
図４の下図に示すように、断面コ字型の固定ヨーク２の内部に電路であるバイメタル１と磁性部材９とが配置され、可動ヨーク３は固定ヨーク２との間に作動用のギャップを設けて隣接配置されている。電路に短絡電流等が流れると、電路を中心とした磁束が発生する。このため、磁性部材９を設けると磁性部材９が磁化することによって図５の下図に示すように可動ヨーク３と固定ヨーク２を通過する磁束Ｗｂを多くし、即ち磁束密度を高くすることによって磁力を高めることが可能となる。この結果、可動ヨーク３を吸着する力が高まり、定格電流が小さい回路遮断器であっても、図５に示すように、確実に可動ヨーク３は固定ヨーク２に吸着され、瞬時引き外し動作を行わせることができることとなる。図６に示すように、磁性部材９は固定ヨーク２に密着させるものでも良い。また、磁性部材９は固定ヨーク２のコ字状の腕部に渡すように密着させることや、更に、バイメタル１とも密着させるようにしても良く、その場合であっても、より磁力を高めることが可能である。 As shown in the lower diagram of FIG. 4, the bimetal 1 and the magnetic member 9, which are electric circuits, are arranged inside the fixed yoke 2 having a U-shaped cross section, and the movable yoke 3 has an operating gap between the fixed yoke 2 and the movable yoke 3. Provided adjacent to each other. When a short circuit current or the like flows through the electric circuit, a magnetic flux centered on the electric circuit is generated. Therefore, when the magnetic member 9 is provided, the magnetic member 9 is magnetized to increase the magnetic flux Wb passing through the movable yoke 3 and the fixed yoke 2, as shown in the lower diagram of FIG. Can be increased. As a result, the force to attract the movable yoke 3 is increased, and even if the circuit breaker has a small rated current, the movable yoke 3 is surely attracted to the fixed yoke 2 as shown in FIG. It can be done. As shown in FIG. 6, the magnetic member 9 may be in close contact with the fixed yoke 2. Further, the magnetic member 9 may be brought into close contact with the U-shaped arm portion of the fixed yoke 2, or may be further brought into close contact with the bimetal 1. Even in this case, the magnetic force is further increased. Is possible.
この第１の実施形態のように、磁性部材９をバイメタル１と一体に組み込めば、回路遮断器への組み込み作業が容易となる。このように、磁性部材９は定格電流が比較的小さい回路遮断器においては瞬時引き外し能力を向上させる効果があるが、定格電流が大きい回路遮断器においては、磁性部材９を電路としてヒータとしての機能を持たせ、回路遮断器を傍熱式・傍直熱式として部材を兼用することもできる。傍熱式はバイメタル１に直接電流を流さない形式であり、この場合には図１に示すより線１２をバイメタル１に接続せず、磁性部材９に接続すればよい。 If the magnetic member 9 is integrated with the bimetal 1 as in the first embodiment, the assembling work into the circuit breaker becomes easy. As described above, the magnetic member 9 has an effect of improving the instantaneous tripping capability in a circuit breaker having a relatively small rated current. However, in a circuit breaker having a large rated current, the magnetic member 9 serves as a heater using the magnetic member 9 as an electric circuit. It is possible to use a circuit breaker as a side-heat type or a side-direct heat type. The indirectly heated type is a type in which no current flows directly through the bimetal 1, and in this case, the stranded wire 12 shown in FIG. 1 may be connected to the magnetic member 9 without being connected to the bimetal 1.
なお、磁性部材９をバイメタル１に密着させる場合には、バイメタル１の湾曲方向の反対側に磁性部材９を配置し、バイメタル１の湾曲動作に影響しないようにすることが望ましい。 When the magnetic member 9 is closely attached to the bimetal 1, it is desirable to dispose the magnetic member 9 on the opposite side of the bending direction of the bimetal 1 so as not to affect the bending operation of the bimetal 1.
以上に説明したように、本発明の回路遮断器の瞬時引き外し装置によれば、磁性部材９によって可動ヨーク３と固定ヨーク２を通過する磁束密度が高くなり、定格電流の小さい回路遮断器においても、瞬時引き外し動作を確実に行わせることができる利点がある。 As described above, according to the instantaneous tripping device for a circuit breaker of the present invention, the magnetic member 9 increases the density of magnetic flux passing through the movable yoke 3 and the fixed yoke 2, and the circuit breaker with a small rated current is used. However, there is an advantage that the instantaneous tripping operation can be surely performed.
１ バイメタル
２ 固定ヨーク
３ 可動ヨーク
４ 調節ねじ
５ トリガープレート
６ ラッチ
７ 軸
８ 補助金具
８ａ 上端部
９ 磁性部材
１０ 下部
１１ ばね
１２ より線
Ｗｂ 磁束
DESCRIPTION OF SYMBOLS 1 Bimetal 2 Fixed yoke 3 Movable yoke 4 Adjustment screw 5 Trigger plate 6 Latch 7 Axis 8 Auxiliary metal fitting 8a Upper end part 9 Magnetic member 10 Lower part 11 Spring 12 Strand Wb Magnetic flux
Claims (1)
固定ヨークに隣接させて配置された可動ヨークとからなる回路遮断器の瞬時引き外し装置において、
前記電路はバイメタルであり、磁性部材をバイメタルと一体に固定することにより、電路と固定ヨーク間、または電路と可動ヨーク間の少なくとも一方に、磁性部材を配置したことを特徴とする回路遮断器の瞬時引き外し装置。 A fixed yoke and an electrical circuit disposed therein;
In an instantaneous tripping device of a circuit breaker comprising a movable yoke arranged adjacent to a fixed yoke,
The circuit is a bimetal, and a magnetic member is fixed integrally with the bimetal, whereby a magnetic member is disposed between at least one of the circuit and the fixed yoke or between the circuit and the movable yoke. Instant trip device.
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| JP2015162433A JP6584216B2 (en) | 2015-08-20 | 2015-08-20 | Circuit breaker instantaneous trip device |
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| JP2015162433A JP6584216B2 (en) | 2015-08-20 | 2015-08-20 | Circuit breaker instantaneous trip device |
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| JP6584216B2 true JP6584216B2 (en) | 2019-10-02 |
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