JP5202424B2 - Circuit breaker - Google Patents

Circuit breaker Download PDF

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JP5202424B2
JP5202424B2 JP2009100249A JP2009100249A JP5202424B2 JP 5202424 B2 JP5202424 B2 JP 5202424B2 JP 2009100249 A JP2009100249 A JP 2009100249A JP 2009100249 A JP2009100249 A JP 2009100249A JP 5202424 B2 JP5202424 B2 JP 5202424B2
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circuit breaker
cover
mounting screw
case
width
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JP2010251157A (en
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大輔 中村
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Hitachi Industrial Equipment Systems Co Ltd
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Hitachi Industrial Equipment Systems Co Ltd
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Description

本発明は、回路遮断器に関し、特に、かかる回路遮断器を盤面に取付けるための取付け部の構造に関するものである。   The present invention relates to a circuit breaker, and more particularly to a structure of a mounting portion for mounting such a circuit breaker on a board surface.

従来、回路遮断器では、盤面に取り付けるための取り付けねじ用の穴を、極間の隔壁の位置に設けるのが一般的であり、そのため、従来技術における回路遮断器では、その取付部の強度や絶縁距離の確保などの制約から、以下に説明する２種類の構造のうちのいずれか一方を採用するものがほとんどである。   Conventionally, in a circuit breaker, it is common to provide a hole for a mounting screw for mounting on a board surface at the position of a partition wall between the poles. Because of restrictions such as securing an insulation distance, most of them adopt one of the two types of structures described below.

まず、第一の構造としては、回路遮断器のケースにおいて、極間の隔壁に深い座ぐりを形成して、そこに取り付けねじの座面を設けた構造がある。なお、かかる構造は、回路遮断器の大きさにかかわらず、広く採用されている構造である。   First, as a first structure, in a circuit breaker case, there is a structure in which a deep counterbore is formed in a partition wall between electrodes and a seating surface of a mounting screw is provided there. Such a structure is widely adopted regardless of the size of the circuit breaker.

また、第二の構造として、以下の特許文献１の図４にも開示されるように、回路遮断器の表面を覆うカバーにおいて、極間の隔壁に取り付けねじの座面を設け、他方、ケースには、上記取り付けねじの径よりも少し大きい貫通穴を開けた構造が既に知られている。なお、かかる構造によれば、ケースの極間の隔壁を狭くすることが可能となり、そのため、端子幅を圧迫しないことから、特に、小型の遮断器に多く採用されている。   Further, as disclosed in FIG. 4 of Patent Document 1 below, as a second structure, in the cover covering the surface of the circuit breaker, a mounting screw seating surface is provided on the partition between the electrodes, while the case Has already been known to have a through hole slightly larger than the diameter of the mounting screw. In addition, according to such a structure, it becomes possible to narrow the partition between the poles of the case, and therefore, the terminal width is not compressed, so that it is often used particularly for small circuit breakers.

特開２００７−３１１１８３号公報JP 2007-3111183 A

しかしながら、上述した従来技術になる、特に、前記第一の構造を採用した回路遮断器においては、上記の取り付けねじの座面をケースの極間の隔壁に深く座ぐりをした形状を採用した場合、隔壁の厚さを、取り付ねじの頭部の径よりも小さくする、即ち、隔壁の厚さを狭くすることが出来ないため、端子幅が狭くなり、そのため、特に、小型の遮断器では、端子に接続できる導体の幅が制約を受けるという課題があった。   However, in the circuit breaker that adopts the first structure, which is the above-described prior art, particularly when the shape of the mounting surface of the mounting screw is deeply countersunk into the partition wall between the poles of the case The thickness of the bulkhead is made smaller than the diameter of the head of the mounting screw, that is, the thickness of the bulkhead cannot be narrowed, so the terminal width is narrowed. There is a problem that the width of the conductor that can be connected to the terminal is restricted.

また、前記第二の構造を採用した回路遮断器においては、取り付けねじの座面をカバーに設けた場合、端子幅を広く確保することは出来るが、しかしながら、遮断器を盤面に取り付けた状態では、当該カバーを取り外すことが出来ないことから、遮断器本体から配線を外してカバーを盤面から取り外さないと、その内部のメンテナンスや修理ができないという問題があった。   In addition, in the circuit breaker adopting the second structure, when the mounting screw seat surface is provided on the cover, a wide terminal width can be secured, however, in the state where the circuit breaker is attached to the board surface. Since the cover cannot be removed, there is a problem that maintenance and repair of the inside cannot be performed unless the wiring is removed from the circuit breaker body and the cover is removed from the board surface.

そこで、本発明は、上述した従来技術における課題や問題点に鑑みてなされたものであり、その目的は、遮断器内における端子部の幅を大きく取ることを可能として、かつ、回路遮断器を盤面へ取付けた状態でもそのカバーを取り外すことが可能となる構造の回路遮断器を提供することである。   Therefore, the present invention has been made in view of the problems and problems in the prior art described above, and the purpose thereof is to make it possible to increase the width of the terminal portion in the circuit breaker and to provide a circuit breaker. It is an object of the present invention to provide a circuit breaker having a structure in which the cover can be removed even when attached to a board surface.

上述した目的を達成するため、本発明によれば、主回路を開閉するための可動接触子と固定接触子を備えた接点部と、前記接点部から発生するアークを消滅させる消弧部と、前記可動接触子を開閉するための開閉機構部と、前記主回路の過電流を検出して前記可動接触子を開極させる過電流引外し部とを、樹脂製のケース及びカバーにより内部に形成される空間内に収容して構成される回路遮断器において、当該回路遮断器の本体を盤面に取付けるため、前記ケースの一部に設けられ、取り付けねじを締め付けるための座面を、当該ケースと前記カバーとの合わせ面から前記カバー側へ突出した凸状部に設けた回路遮断器が提供される。   In order to achieve the above-described object, according to the present invention, a contact part including a movable contact and a fixed contact for opening and closing a main circuit, an arc extinguishing part for extinguishing an arc generated from the contact part, An opening / closing mechanism for opening and closing the movable contact and an overcurrent tripping portion for detecting the overcurrent of the main circuit and opening the movable contact are formed inside by a resin case and cover. In a circuit breaker configured to be accommodated in a space to be mounted, a mounting surface of the circuit breaker is provided on a part of the case for mounting the body of the circuit breaker on a board surface, and a seating surface for tightening a mounting screw is connected to the case. A circuit breaker provided on a convex portion protruding from the mating surface with the cover toward the cover is provided.

そして、本発明では、前記に記載の回路遮断器において、前記取り付けねじ座面が設けられた前記ケースの凸状部の幅が、前記主回路を接続するための端子を内部に収容する端子収容部の間に形成される隔壁の幅とほぼ同じになるようにすることが好ましく、又は、前記カバーを、前記凸状部の周囲を覆うように形成することが好ましい。更には、前記取り付けねじ座面に締め付けられる前記取り付けねじの頭部の幅を、当該取り付けねじ座面の幅よりも小さくし、そして、前記凸状部の周囲に勾配を設けることが好ましい。   According to the present invention, in the circuit breaker described above, the width of the convex portion of the case provided with the mounting screw seating surface accommodates a terminal for connecting the main circuit therein. It is preferable that the width of the partition formed between the portions is substantially the same, or the cover is preferably formed so as to cover the periphery of the convex portion. Furthermore, it is preferable to make the width of the head of the mounting screw fastened to the mounting screw seat surface smaller than the width of the mounting screw seat surface and to provide a gradient around the convex portion.

上述した本発明によれば、小型の回路遮断器においても、端子部の幅を大きく設定することが出来ることから、従来の構成による回路遮断器に比較して、幅の広い導体や圧着端子を接続することが可能となり、かつ、遮断器を盤面へ取り付けた状態で、ケースからカバーを取り外すことが可能であることから、遮断器を取り付けた状態のままで、当該回路遮断器の内部のメンテナンスや修理を行うことが可能になるという、実用的にも優れた効果を発揮する。   According to the present invention described above, even in a small circuit breaker, since the width of the terminal portion can be set large, a wider conductor or crimp terminal can be used compared to a circuit breaker having a conventional configuration. Since it is possible to connect and the cover can be removed from the case with the circuit breaker attached to the board surface, the internal maintenance of the circuit breaker is maintained with the circuit breaker attached. It is possible to perform repairs and repairs.

また、取り付けねじの座面となる凸状部の周囲をカバーで覆うことにより、大電流の遮断時、端子付近から噴出するアークに対しても、十分な絶縁距離を確保することが出来、それに伴うアーク地絡や絶縁低下を防止することができる。   In addition, by covering the periphery of the convex part that becomes the seating surface of the mounting screw with a cover, it is possible to secure a sufficient insulation distance against an arc that is ejected from the vicinity of the terminal when a large current is interrupted. The accompanying arc ground fault and insulation drop can be prevented.

更には、回路遮断器の製造工程においても、取り付けねじ座面の凸部に勾配をつけることによれば、その上から容易にカバーを被せることができ、組立性を損うことはない。   Furthermore, even in the circuit breaker manufacturing process, by providing a slope to the convex portion of the mounting screw seating surface, the cover can be easily covered from above, and the assemblability is not impaired.

本発明の実施の形態になる回路遮断器の、特に、その取り付けねじ部における断面を示す図である。It is a figure which shows the cross section in the attachment screw part especially of the circuit breaker which becomes embodiment of this invention. 本発明の実施の形態になる回路遮断器の内部構成の一例を示す図である。It is a figure which shows an example of the internal structure of the circuit breaker which becomes embodiment of this invention. 本発明の実施の形態になる回路遮断器を正面から見た図である。It is the figure which looked at the circuit breaker which becomes embodiment of this invention from the front.

以下、本発明の実施の形態について、添付の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 accompanying drawings.

まず、添付の図２には、本発明の一実施の形態になる回路遮断器の、特に、その内部構成の一例を示している。即ち、図からも明らかなように、回路遮断器は、以下に詳細を説明する樹脂製のケース１１とカバー１２とからなる筐体の内部には、主回路を開閉するための可動接触子２１と固定接触子２２とを備えた接点部２０と、接点部２０から発生するアークを消滅させる消弧部３０と、可動接触子２１を開閉するための開閉機構部４０と、検出器５１により主回路の過電流を検出して可動接触子２１を開極させるための過電流引外し部５０とを備えている。   First, FIG. 2 attached herewith shows an example of an internal configuration of a circuit breaker according to an embodiment of the present invention. That is, as is apparent from the figure, the circuit breaker has a movable contact 21 for opening and closing the main circuit inside a casing made up of a resin case 11 and a cover 12, which will be described in detail below. The contact portion 20 including the fixed contact 22, the arc extinguishing portion 30 for extinguishing the arc generated from the contact portion 20, the opening / closing mechanism portion 40 for opening and closing the movable contact 21, and the detector 51. An overcurrent tripping section 50 for detecting an overcurrent of the circuit and opening the movable contact 21 is provided.

次に、添付の図３には、本発明の一実施の形態になる回路遮断器の、正面から見た状態を示している。回路遮断器には、主回路を接続するための端子３１を複数備えており、その間を仕切る隔壁３２が形成されている。この隔壁にはねじにより回路遮断器を盤面に取り付けるための取付ねじ穴３３が形成されている。   Next, FIG. 3 attached shows a circuit breaker according to an embodiment of the present invention as viewed from the front. The circuit breaker includes a plurality of terminals 31 for connecting the main circuit, and a partition wall 32 is formed for partitioning between the terminals. An attachment screw hole 33 for attaching the circuit breaker to the board surface by a screw is formed in the partition wall.

次に、添付の図１には、上記のその概略構成を示した回路遮断器において、ケース１１とカバー１２とからなる筐体の、特に、取り付けねじ部における断面構造を示す。図からも明らかなように、本発明になる回路遮断器では、遮断器の筐体が、樹脂製のケース１１、そして、やはり樹脂製のカバー１２により構成されている。   Next, FIG. 1 attached herewith shows a cross-sectional structure of a housing made up of a case 11 and a cover 12, particularly at a mounting screw portion, in the circuit breaker having the schematic configuration described above. As is apparent from the figure, in the circuit breaker according to the present invention, the casing of the breaker is composed of a resin case 11 and a resin cover 12.

当該ケース１１には、その内部に、例えば、上記主回路を接続する端子をその内部に収容するための端子収容部１８が、複数、形成されており、これら複数の端子収容部１８を仕切るように、複数（この例では、２枚）の隔壁１９が形成されている。そして、この隔壁１９を貫通して、取り付けねじ１３を用いて本体を盤面１４に固定するための、所謂、取り付け穴１１１が、それぞれ、形成されている。なお、取り付けねじ１３を締め付けるための座面（取り付けねじ座面）１５は、上記隔壁１９から、ケース１１の上面であるケースとカバーの合わせ面（ケース・カバー合わせ面）１６の上方、即ち、カバー１２の方向へ、突出した凸状部１７の上面に形成されている。   In the case 11, for example, a plurality of terminal accommodating portions 18 for accommodating, for example, terminals connecting the main circuit are formed in the case 11 so as to partition the terminal accommodating portions 18. In addition, a plurality of (two in this example) partition walls 19 are formed. Then, so-called attachment holes 111 are formed through the partition wall 19 to fix the main body to the board surface 14 using the attachment screws 13. A seating surface (mounting screw seating surface) 15 for tightening the mounting screw 13 is above the partition wall 19 and above the case-cover mating surface (case-cover mating surface) 16 that is the upper surface of the case 11, that is, It is formed on the upper surface of the convex portion 17 protruding in the direction of the cover 12.

なお、上記ケース１１において、その上方に突出して形成された凸状部１７の幅（ＴＰ）を、上記端子収容部１８を区切るためにその間に形成された隔壁１９の幅（ＴＷ）とほぼ同じにする（ＴＰ≒ＴＷ）ことによれば、端子収容部１８の幅（Ｗ）をより大きく確保することができる。即ち、上記端子収容部１８内において、その内部空間を有効に利用して、より幅の広い導体や圧着端子を接続することが可能になる。 In the case 11, the width (T P ) of the projecting portion 17 protruding upward is defined as the width (T W ) of the partition wall 19 formed between the terminal accommodating portions 18. By making them substantially the same (T P ≈T W ), it is possible to secure a larger width (W) of the terminal accommodating portion 18. That is, it is possible to connect a wider conductor or a crimp terminal by effectively using the internal space in the terminal accommodating portion 18.

また、上記凸状部１７の幅（Ｔ）は、上記取り付けねじ１３の頭部１３Ｈの径（Ｄ）よりも大きく設定されている。そして、上記ケース１１のケース・カバー合わせ面１６よりも上方に突出した凸状部１７を介して（具体的には、凸状部１７の上面に）、上記取り付けねじ座面１５が形成されていることから、取り付けねじ１３によって本体を盤面１４に固定した状態でも、カバー１２を取り外すことができる。これにより、取付け状態でも、遮断器内部のメンテナンスや修理を行うことが可能となる。   Further, the width (T) of the convex portion 17 is set larger than the diameter (D) of the head portion 13H of the mounting screw 13. Then, the mounting screw seat surface 15 is formed via a convex portion 17 projecting upward from the case / cover mating surface 16 of the case 11 (specifically, on the upper surface of the convex portion 17). Therefore, the cover 12 can be removed even when the main body is fixed to the board surface 14 with the mounting screw 13. Thereby, it becomes possible to perform maintenance and repair inside the circuit breaker even in the mounted state.

さらに、図からも明らかなように、上記凸状部１７の周囲をカバー１２で覆うことによれば、特に、大電流を遮断した際、端子収容部１８の付近から噴出するアークに対しても、十分な絶縁距離を確保することができ、もって、それに伴うアーク地絡や絶縁低下を確実に防止することが可能となる。   Further, as is apparent from the figure, by covering the periphery of the convex portion 17 with the cover 12, particularly when an arc is ejected from the vicinity of the terminal accommodating portion 18 when a large current is interrupted. A sufficient insulation distance can be ensured, so that it is possible to reliably prevent an arc ground fault and insulation deterioration associated therewith.

なお、このとき、上述したように、凸状部１７の周囲をカバー１２で覆う構造を採用することにより、当該カバー１２をケース１１の上へ被せる作業が難しくなることが懸念される場合には、例えば、上記凸状部の周囲に適切な勾配をつけても良い。これにより、回路遮断器の製造工程においても、凸状部１７の上から容易にカバーを被せる、その組立性を損なわない。   At this time, as described above, when it is feared that it is difficult to cover the cover 12 on the case 11 by adopting a structure in which the periphery of the convex portion 17 is covered with the cover 12. For example, an appropriate gradient may be provided around the convex portion. Thereby, also in the manufacturing process of a circuit breaker, the assembling property which can easily cover the convex portion 17 is not impaired.

１１…ケース、１２…カバー、１３…取り付けねじ、１４…盤面、１５…取り付けねじ座面、１６…ケース・カバー合わせ面、１７…凸状部、１８…端子収容部、１９…隔壁。   DESCRIPTION OF SYMBOLS 11 ... Case, 12 ... Cover, 13 ... Mounting screw, 14 ... Board surface, 15 ... Mounting screw seat surface, 16 ... Case-cover mating surface, 17 ... Convex part, 18 ... Terminal accommodating part, 19 ... Partition.

Claims (5)

主回路を開閉するための可動接触子と固定接触子を備えた接点部と、前記接点部から発生するアークを消滅させる消弧部と、前記可動接触子を開閉するための開閉機構部と、前記主回路の過電流を検出して前記可動接触子を開極させる過電流引外し部とを、樹脂製のケース及びカバーにより内部に形成される空間内に収容して構成される回路遮断器において、
当該回路遮断器の本体を盤面に取付けるため、前記ケースの一部に設けられ、取り付けねじを締め付けるための座面を、当該ケースと前記カバーとの合わせ面から前記カバー側へ突出した凸状部に設けたことを特徴とする回路遮断器。 A contact portion provided with a movable contact and a fixed contact for opening and closing the main circuit, an arc extinguishing portion for extinguishing an arc generated from the contact portion, an opening and closing mechanism portion for opening and closing the movable contact, A circuit breaker configured by accommodating an overcurrent tripping portion for detecting an overcurrent of the main circuit and opening the movable contact in a space formed by a resin case and a cover. In
In order to attach the main body of the circuit breaker to the board surface, a convex portion provided on a part of the case and protruding from the mating surface between the case and the cover to the cover side for fastening a mounting screw A circuit breaker characterized by being provided in the circuit. 前記請求項１に記載の回路遮断器において、前記取り付けねじ座面が設けられた前記ケースの凸状部の幅が、前記主回路を接続するための端子を内部に収容する端子収容部の間に形成される隔壁の幅とほぼ同じになるようにしたことを特徴とする回路遮断器。   2. The circuit breaker according to claim 1, wherein a width of the convex portion of the case provided with the mounting screw seating surface is between a terminal accommodating portion that accommodates a terminal for connecting the main circuit therein. A circuit breaker characterized by having substantially the same width as that of the partition wall formed on the board. 前記請求項２に記載の回路遮断器において、前記取り付けねじ座面に締め付けられる前記取り付けねじの頭部の幅を、当該取り付けねじ座面の幅とほぼ同じにしたことを特徴とする回路遮断器。 The circuit breaker according to claim 2, the width of the head of the mounting screw is tightened to the mounting screw seat surface, the circuit breaker being characterized in that the substantially the same as the width of the mounting screw seat surface . 前記請求項１に記載の回路遮断器において、前記カバーを、前記凸状部の周囲を覆うように形成したことを特徴とする回路遮断器。 2. The circuit breaker according to claim 1, wherein the cover is formed so as to cover the periphery of the convex portion. 前記請求項４に記載の回路遮断器において、前記凸状部の周囲に勾配を設けたことを特徴とする回路遮断器。 5. The circuit breaker according to claim 4, wherein a gradient is provided around the convex portion.
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JPH04162326A (en) * 1990-10-25 1992-06-05 Mitsubishi Electric Corp Fitting device for circuit breaker
JPH0864101A (en) * 1994-08-24 1996-03-08 Fuji Electric Co Ltd Fixing method for earth leakage breaker
JPH11154453A (en) * 1997-11-20 1999-06-08 Mitsubishi Electric Corp Case for circuit breaker
JP2002163970A (en) * 2000-11-27 2002-06-07 Matsushita Electric Works Ltd Switch

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