JP2013020756A - Circuit breaker - Google Patents

Circuit breaker Download PDF

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JP2013020756A
JP2013020756A JP2011151828A JP2011151828A JP2013020756A JP 2013020756 A JP2013020756 A JP 2013020756A JP 2011151828 A JP2011151828 A JP 2011151828A JP 2011151828 A JP2011151828 A JP 2011151828A JP 2013020756 A JP2013020756 A JP 2013020756A
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terminal
circuit breaker
breaker
spring
breaker body
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Yukihiro Azuchi
行博 安土
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II P I KK
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Abstract

PROBLEM TO BE SOLVED: To provide a circuit breaker with both of high conductivity and a high spring property.SOLUTION: A circuit breaker comprises a breaker body 2 with an approximate concave-shaped cross section, one terminal 3 integrally assembled with a lower part of the breaker body 2, a thermistor 5 arranged on the one terminal 3, a curved bimetal 6 located on the thermistor 5, and a composite member 7, in which a spring part 13 is integrally provided to be bent downward on one edge of a cover part 12 closing an upper opening of the breaker body 2. and another terminal 11 is integrally formed on the other edge of the cover part 12. A contact member 13a contacting one terminal 3 is fixed to a tip of the spring part 13 in the composite member 7, and both of the terminal 3 and the composite member 7 are made of pure copper.

Description

本発明は、電力機器等における電気回路において、過電流が流れた場合に、その電路を遮断するサーキットブレーカーの構造に関する。   The present invention relates to a circuit breaker structure that cuts off an electric circuit when an overcurrent flows in an electric circuit of a power device or the like.

図8〜図10に示すように、一般に、小型のバイメタル式サーキットブレーカー51は、断面凹形の合成樹脂製下側ケース部材53Aと下側ケース部材53Aの開口を閉止する断面逆凹形の合成樹脂製上側ケース部材53Bとによってケース53が形成され、下側ケース部材53Aの左側には二段に屈曲された+側端子54が、同右側には同じく二段に屈曲された−側端子55がそれぞれ一体に成形され、また上側ケース部材53Bには補強用の金属プレート52が一体に成形されていた。   As shown in FIGS. 8 to 10, generally, the small bimetal circuit breaker 51 is composed of a synthetic resin lower case member 53A having a concave cross section and a reverse concave composite having a cross section that closes the opening of the lower case member 53A. A case 53 is formed by the upper case member 53B made of resin, a + side terminal 54 bent in two steps on the left side of the lower case member 53A, and a − side terminal 55 bent in two steps on the right side. Are integrally formed, and a reinforcing metal plate 52 is integrally formed on the upper case member 53B.

更に、下側ケース部材53Aにおける+側端子54の上段部54aには板状バネ部材56の基端部56aがレーザー溶接され、また板状バネ部材56の先端部56bには接点部材57が一体に接合され、接点部材57は板状バネ部材56の変形に伴って−側端子55の上段部55aに当接自在となっていた。   Further, the base end portion 56a of the plate spring member 56 is laser welded to the upper step portion 54a of the + side terminal 54 in the lower case member 53A, and the contact member 57 is integrated with the tip end portion 56b of the plate spring member 56. The contact member 57 can be brought into contact with the upper step portion 55a of the negative terminal 55 in accordance with the deformation of the plate spring member 56.

この他、−側端子55の下段部55bにはセラミック製の円板状サーミスター58が固定され、サーミスター58上にはバイメタル59が載置されていた。   In addition, a ceramic disc-shaped thermistor 58 is fixed to the lower step portion 55 b of the negative terminal 55, and a bimetal 59 is placed on the thermistor 58.

特開2003−109580号公報JP 2003-109580 A 特許第4592117号公報Japanese Patent No. 4592117

前項で述べた一般的な小型サーキットブレーカー51では、所定の電流が流れている場合には、図8に示すように、バイメタル59が上向きに湾曲した形状となっており、そのため、バネ部材56の先端の接点部材57が−側端子55の上段部55aに当接しており、その結果、板状バネ部材56を介して+側端子54から−側端子55への通電が継続的に行われる。   In the general small circuit breaker 51 described in the previous section, when a predetermined current flows, the bimetal 59 has a shape curved upward as shown in FIG. The contact member 57 at the tip is in contact with the upper step portion 55 a of the − side terminal 55, and as a result, energization from the + side terminal 54 to the − side terminal 55 is continuously performed via the plate-like spring member 56.

一方、図9に示すように、過電流が流れた場合には、その際の温度上昇に伴って、バイメタル59が下向きに反転湾曲して板状バネ部材56が押し上げられる結果、その先端部の接点部材57が−側端子55の上段部55aから離れて通電が停止する。 On the other hand, as shown in FIG. 9, when an overcurrent flows, as the temperature rises at that time, the bimetal 59 reversely curves downward and the plate spring member 56 is pushed up. The contact member 57 is separated from the upper stage 55a of the negative terminal 55, and the energization is stopped.

前述したような構造の小型サーキットブレーカー51において、バネ部材56ついては、バネ性と通電性の両方の高いことが望ましい。   In the small circuit breaker 51 having the above-described structure, it is desirable that the spring member 56 has both high spring performance and high electrical conductivity.

従来、前記バネ部材56には、通常、コルソン合金が使用されていたが、該コルソン合金は高いバネ性を有するものの、導電性については、十分ではなく、そのため近年の省電力志向の要求に対応していない面があった。   Conventionally, a Corson alloy is usually used for the spring member 56. However, although the Corson alloy has a high spring property, the conductivity is not sufficient, and therefore, it corresponds to the recent demand for power saving. There was a side that was not.

また、本願の特許出願人は、前述した従来のサーキットブレーカーにおいて、一方の端子とバネ部材とブレーカー本体の上部を被覆するカバー部とを一体化した複合部材を備えたものを開発したが、かかるブレーカーにおいても導電性について改良の余地があった。   In addition, the patent applicant of the present application has developed a conventional circuit breaker described above that includes a composite member in which one terminal, a spring member, and a cover portion covering the upper portion of the breaker body are integrated. There was room for improvement in electrical conductivity even in the breaker.

本発明の目的は、高い導電性と高いバネ性の両方を備えたバネ部材を有するサーキットブレーカーを提供することにある。   An object of the present invention is to provide a circuit breaker having a spring member having both high conductivity and high spring property.

本願発明の発明者は、純銅が高い導電性だけではなく、サーキットブレーカーにおいて重要な構成要素であるバネ部材に要求されるバネ性についても優れていることを見出し、本発明を完成させたものである。   The inventor of the present invention has found that pure copper is excellent not only in high conductivity but also in spring properties required for spring members which are important components in circuit breakers, and has completed the present invention. is there.

すなわち、請求項1記載の本発明は、ブレーカー本体に取り付けられた一対の端子と、基端部が一方の端子に接合され、先端部に接点部材がクラッドされてなるバネ部材とを有するサーキットブレーカーにおいて、前記一対の端子並びにバネ部材がいずれも純銅で構成されていることを特徴とするものである。純銅は、Cuが99.5%以上であって、好ましく99.9%以上である。また、純銅としては、タフピッチ銅、脱酸銅および無酸素銅等が挙げられる。本発明では、電気伝導度が100%のものが好ましく、無酸素銅は、特に電気伝導性並びに加工性に優れているため、好適である。 That is, the present invention according to claim 1 is a circuit breaker having a pair of terminals attached to a breaker body, and a spring member having a base end joined to one terminal and a contact member clad at the tip. The pair of terminals and the spring member are both made of pure copper. In pure copper, Cu is 99.5% or more, and preferably 99.9% or more. Examples of pure copper include tough pitch copper, deoxidized copper, and oxygen-free copper. In the present invention, those having an electric conductivity of 100% are preferred, and oxygen-free copper is suitable because it is particularly excellent in electric conductivity and workability.

また請求項2記載の本発明は、断面略凹形のブレーカー本体と、ブレーカー本体の下部に一体に組み込まれた一方の端子と、他方の端子並びにブレーカー本体の上部開口を閉止するカバー部および先端部に接点部材がクラッドされたバネ部材が一体に連成された複合部材とを有するサーキットブレーカーにおいて、前記一対の端子並びにバネ部材がいずれも純銅で構成されていることを特徴とするものである。純銅については、前記請求項1と同様である。 According to a second aspect of the present invention, there is provided a breaker body having a substantially concave cross section, one terminal integrated into a lower portion of the breaker body, a cover portion and a tip for closing the other terminal and the upper opening of the breaker body. In the circuit breaker having a composite member in which a spring member having a contact member clad on a portion is integrally coupled, the pair of terminals and the spring member are both made of pure copper. . About pure copper, it is the same as that of the said Claim 1.

本発明に係るサーキットブレーカーは、高いバネ性と高い導電性を兼ね備えた純銅によってバネ部材が構成されているため、従来のこの種サーキットブレーカーに比べて確実な作動性と良好な通電性の両方が得られる。   In the circuit breaker according to the present invention, since the spring member is made of pure copper having both high spring property and high conductivity, both reliable operability and good electrical conductivity are provided as compared with this conventional circuit breaker. can get.

また、本発明のサーキットブレーカーでは、前記バネ部材の他、一対の端子、或いはブレーカー本体の上部を構成するカバー部材についても純銅で構成されているため、ブレーカー全体としての通電性も従来に比べて大幅に向上し、そのため近年の省電力の要請にも十分に対応することが可能となる。   Further, in the circuit breaker of the present invention, since the cover member that constitutes the pair of terminals or the upper part of the breaker body is also made of pure copper in addition to the spring member, the electrical conductivity of the breaker as a whole is also higher than that of the conventional circuit breaker. Therefore, it is possible to sufficiently meet the recent demand for power saving.

本発明に係る小型サーキットブレーカーの一例を示す縦断面図である。It is a longitudinal cross-sectional view which shows an example of the small circuit breaker which concerns on this invention. 同実施形態において、過電流時の回路遮断の状態を示す縦断面図である。In the same embodiment, it is a longitudinal cross-sectional view which shows the state of the circuit interruption | blocking at the time of overcurrent. 同実施形態に係る小型サーキットブレーカーの斜視図である。It is a perspective view of the small circuit breaker concerning the embodiment. 同実施形態に係る小型サーキットブレーカーの分解斜視図である。It is a disassembled perspective view of the small circuit breaker which concerns on the same embodiment. 前記実施形態の変形例を示す小型サーキットブレーカーの縦断面図である。It is a longitudinal cross-sectional view of the small circuit breaker which shows the modification of the said embodiment. 前記実施形態の更に他の変形例を示す小型サーキットブレーカーの縦断面図である。It is a longitudinal cross-sectional view of the small circuit breaker which shows the other modification of the said embodiment. 他の実施形態に係るサーキットブレーカーの縦断面図である。It is a longitudinal cross-sectional view of the circuit breaker which concerns on other embodiment. 従来の小型サーキットブレーカーの縦断面図である。It is a longitudinal cross-sectional view of the conventional small circuit breaker. 同じく従来の小型サーキットブレーカーにおいて、過電流時の回路遮断の状態を示す縦断面図である。Similarly, in the conventional small circuit breaker, it is a longitudinal sectional view showing a state of circuit interruption at the time of overcurrent. 同じく従来の小型サーキットブレーカーの斜視図である。It is a perspective view of the conventional small circuit breaker.

次に、本発明に係るバイメタル式小型サーキットブレーカーの実施形態を図面にしたがって説明するが、本発明はかかる実施形態に限定されるものではない。   Next, although the embodiment of the bimetal type small circuit breaker concerning the present invention is described according to a drawing, the present invention is not limited to this embodiment.

本実施形態において、上下左右は図1基準とし、上とは図1の上側方向を指し、下とは同図の下側方向を指すものとする。また、左とは図1の左側方向を指し、右とは同図右側方向を指すものとする。   In the present embodiment, the top, bottom, left, and right are based on FIG. 1, and “upper” refers to the upper direction in FIG. 1 and “lower” refers to the lower direction in FIG. Further, the left means the left direction in FIG. 1, and the right means the right direction in the figure.

図1〜図4に示すように、本実施形態に係る小型のサーキットブレーカー1は、−側端子3が一体成形された断面略凹形のブレーカー本体2と、ブレーカー本体2の中央凹部4に収容された円板状のセラミック製サーミスター5と、サーミスター5の上側に載置されたバイメタル6と、バイメタル6の上側に位置し、ブレーカー本体2の開口を閉止する後述の複合部材7とを有している。   As shown in FIGS. 1 to 4, the small circuit breaker 1 according to the present embodiment is accommodated in a breaker body 2 having a substantially concave cross section in which a negative terminal 3 is integrally formed, and a central recess 4 of the breaker body 2. A disc-shaped ceramic thermistor 5, a bimetal 6 placed on the upper side of the thermistor 5, and a composite member 7 which is located on the upper side of the bimetal 6 and closes the opening of the breaker body 2. Have.

図4に示すように、ブレーカー本体2は、合成樹脂製であって、平面から見て略方形となされ、中央には円形透孔2aが形成され、その周囲が第一内底面2bとなされ、更に第一内底面2bの周囲には第一内底面2bよりも一段高い第二内底面2cが形成され、これら底面2b・2cを囲むように起立壁8が形成され、また起立壁8の右側部分には開離部2dが形成され、更に開離部2dを挟む起立壁8端部に上下方向に伸びる柱状部9が形成されている。 As shown in FIG. 4, the breaker body 2 is made of synthetic resin and has a substantially square shape when viewed from above, a circular through hole 2 a is formed at the center, and the periphery thereof is a first inner bottom surface 2 b. Further, a second inner bottom surface 2c that is one step higher than the first inner bottom surface 2b is formed around the first inner bottom surface 2b, and a standing wall 8 is formed so as to surround these bottom surfaces 2b and 2c. A separation portion 2d is formed in the portion, and a columnar portion 9 extending in the vertical direction is formed at the end of the standing wall 8 sandwiching the separation portion 2d.

そして、図1に示すように、−側端子3はブレーカー本体2の下部に一体に成形され、右側寄り部分には前記円形透孔2aの底面となる凹部3aが形成され、該部に前記サーミスター5が収容されている。 As shown in FIG. 1, the negative terminal 3 is formed integrally with the lower portion of the breaker body 2, and a concave portion 3a serving as a bottom surface of the circular through hole 2a is formed on the right side portion. Mr. 5 is accommodated.

図4に示すように、バイメタル6は平面から見て略方形であって、通常の正常な通電状態では上向きに湾曲した形状となっている。そして、バイメタル6は、ブレーカー本体2の第一内底面2bに形成された4箇所の凹弧部2eに嵌め入れられている。   As shown in FIG. 4, the bimetal 6 is substantially square when viewed from above, and has a shape curved upward in a normal normal energization state. The bimetal 6 is fitted into four concave arc portions 2 e formed on the first inner bottom surface 2 b of the breaker body 2.

複合部材7は、ブレーカー本体2の開口を閉止し得る略方形のカバー部12と、カバー部12から右側方向に伸びる+側端子部11と、カバー部12の左側縁からその下側へ折り返されたバネ部13とを備えている。そして、カバー部12は平面から見て外形が方形であって、外周部12aを残して上側へ膨出した形状となされている。また端子部11は前記カバー部12よりも小さい方形となされ、ブレーカー本体2の右側部分の開離部2dに嵌め入れられている。バネ部13はカバー部12よりも幅の狭い帯状となされ、先端部には銀製の接点部材13aがクラッドされている。すなわち、当該複合部材7は、要するに、+側端子とブレーカー本体2を閉止するカバーと通電を制御する接点バネの3つの機能を有するのである。そして、複合部材7並びに前述した−側端子3はいずれも純銅で構成されている。   The composite member 7 is folded back from the left side edge of the cover portion 12 to the lower side thereof, the substantially rectangular cover portion 12 that can close the opening of the breaker body 2, the + side terminal portion 11 extending rightward from the cover portion 12. And a spring portion 13. The cover portion 12 has a square outer shape when seen from the plane, and has a shape that bulges upward while leaving the outer peripheral portion 12a. Further, the terminal portion 11 has a rectangular shape smaller than the cover portion 12 and is fitted into the opening 2d on the right side portion of the breaker body 2. The spring portion 13 is formed in a strip shape that is narrower than the cover portion 12, and a silver contact member 13a is clad at the tip portion. That is, the composite member 7 basically has three functions: a positive terminal, a cover for closing the breaker body 2, and a contact spring for controlling energization. The composite member 7 and the negative terminal 3 described above are both made of pure copper.

この他、前記複合部材7におけるカバー部12は、ブレーカー本体2周縁の起立壁8内に嵌め込まれ、その周縁部12aは、加熱して押し倒した起立壁8の上部8aと前記柱状部9によってかしめられ、その結果、カバー部12の外周部12aはブレーカー本体2内に固定されている。また、複合部材7のカバー部12における膨出部12bの周縁とこれに隣り合う起立壁8の上部8aおよび柱状部9との間隙Bに接着剤(図示せず)を流入させることによって、当該ブレーカー内の密閉性を得ることができる。   In addition, the cover portion 12 of the composite member 7 is fitted into the upright wall 8 at the periphery of the breaker body 2, and the peripheral portion 12 a is caulked by the upper portion 8 a of the upright wall 8 that is heated and pushed down and the columnar portion 9. As a result, the outer peripheral portion 12 a of the cover portion 12 is fixed in the breaker body 2. Further, by flowing an adhesive (not shown) into the gap B between the peripheral edge of the bulging portion 12b in the cover portion 12 of the composite member 7 and the upper portion 8a and the columnar portion 9 of the standing wall 8 adjacent thereto, Sealability in the breaker can be obtained.

そして、図3に示すように、本実施形態に係るサーキットブレーカー1は、前述した構造によって、ブレーカー本体2の右側から+側端子部11が伸び、ブレーカー本体2の左側から−側端子3が伸びた形態となっている。   As shown in FIG. 3, the circuit breaker 1 according to the present embodiment has the structure described above, the + side terminal portion 11 extends from the right side of the breaker body 2, and the − side terminal 3 extends from the left side of the breaker body 2. It has become a form.

次に、本実施形態に係るサーキットブレーカー1の作動要領について説明すると、図1に示すように、通常の正常な通電状態では、バイメタル6が上側に湾曲し、複合部材7におけるバネ部13のバネ力によって、その先端部分の接点部材13aが−側端子3に当接して電流が流れる状態が維持される。   Next, the operation procedure of the circuit breaker 1 according to the present embodiment will be described. As shown in FIG. 1, in a normal normal energization state, the bimetal 6 is curved upward, and the spring of the spring portion 13 in the composite member 7. Due to the force, the contact member 13a at the tip end part abuts on the negative terminal 3 and a state in which a current flows is maintained.

一方、図2に示すように、過電流が流れた場合には、その温度上昇によって、それまで上側に湾曲していたバイメタル6が下側へ反転湾曲し、その結果、複合部材7のバネ部13がそのバネ力に抗して押し上げられ、これに伴ってバネ部13先端の接点部材13aが−側端子3から離れて通電が停止される。その後、再び正常な通常状態に戻った場合には前記バイメタル6も元の形状になり、その結果、再びバネ部13のバネ力によって接点部材13aが−側端子3に当接して通電が再開されるのである。   On the other hand, as shown in FIG. 2, when an overcurrent flows, the bimetal 6 that has been curved upward until the current rises is inverted and curved downward, and as a result, the spring portion of the composite member 7. 13 is pushed up against the spring force, and accordingly, the contact member 13a at the tip of the spring portion 13 is separated from the negative terminal 3 to stop energization. Thereafter, when the normal state is restored again, the bimetal 6 also becomes the original shape. As a result, the contact member 13a comes into contact with the negative terminal 3 again by the spring force of the spring portion 13, and the energization is resumed. It is.

以上述べたブレーカー1の動作において、複合部材7におけるバネ部13がバネ性に優れた純銅で構成されているため、当該ブレーカー1の長年の繰り返し使用によってもバネ部13のバネ性は低下せず、確実な作動が確保され、更に複合部材7並びに−側端子の全てが純銅で構成されているため、高い導電性が得られ、そのため電力ロスも最小限に抑えられる。   In the operation of the breaker 1 described above, since the spring portion 13 in the composite member 7 is made of pure copper having excellent spring property, the spring property of the spring portion 13 does not deteriorate even after repeated use of the breaker 1 for many years. Since reliable operation is ensured and the composite member 7 and the negative terminal are all made of pure copper, high conductivity is obtained, and power loss is also minimized.

図5に示すサーキットブレーカー21は、前述したサーキットブレーカー1の変形例であって、表面実装可能な構造としたものである。具体的には、先ず−側端子23が、前記実施形態の−側端子3と比べて、左側部分が平板状となされ、且つブレーカー本体22の左側部から僅かに突出した形態となされている。また、複合部材27における+側端子部31は、前記実施形態の複合部材7における+側端子部11と比べて、下側に伸び、且つブレーカー本体22の右側部から僅かに突出した形態となされている。また更に、このように、−側端子23と+側端子部31の各形状を一部変更することに伴って、ブレーカー本体22および柱状部29も若干変更された構造となされている。   A circuit breaker 21 shown in FIG. 5 is a modified example of the circuit breaker 1 described above, and has a structure that can be surface-mounted. Specifically, first, the minus side terminal 23 has a flat plate shape on the left side and slightly protrudes from the left side of the breaker body 22 as compared with the minus side terminal 3 of the embodiment. Further, the + side terminal portion 31 in the composite member 27 extends downward and slightly protrudes from the right side portion of the breaker body 22 as compared to the + side terminal portion 11 in the composite member 7 of the above embodiment. ing. Furthermore, as described above, the breaker body 22 and the columnar portion 29 are also slightly changed in accordance with a partial change in the shapes of the − side terminal 23 and the + side terminal portion 31.

そして、本実施形態においても、複合部材27並びに−側端子23はいずれも純銅で構成されており、そのため、前述した実施形態と同様、確実な作動性と高い通電性が長年にわたって維持され得る。   Also in this embodiment, both the composite member 27 and the negative terminal 23 are made of pure copper, and therefore, reliable operability and high electrical conductivity can be maintained for many years as in the above-described embodiment.

なお、その他の部分については、前記実施形態と同様であり、図5において、前記実施形態と同じ符号を付すことによって、説明を省略する。   The other parts are the same as those in the above embodiment, and the same reference numerals as those in the above embodiment are given in FIG.

図6に示すサーキットブレーカー31も、前述したサーキットブレーカー1の変形例であって、図5のものと同様、表面実装可能な構造としたものである。具体的には、先ず−側端子33が、前記実施形態の−側端子3と比べて、左側部分が平板状であって、その先端部33aが上方に屈曲した形状となされ、且つブレーカー本体32の左側部から突出しない形態となされている。また、複合部材37における+側端子部41は、前記実施形態の複合部材7における+側端子部11と比べて、下側に伸び、且つブレーカー本体32の右側部で断面略鉤形に屈曲された形態となされている。また更に、このように、−側端子33と+側端子部41の各形状を一部変更することに伴って、ブレーカー本体32も若干変更された構造となされている。   A circuit breaker 31 shown in FIG. 6 is also a modified example of the circuit breaker 1 described above, and has a structure that can be surface-mounted as in FIG. Specifically, first, the minus side terminal 33 is shaped like a flat plate on the left side as compared with the minus side terminal 3 of the above embodiment, and its tip end portion 33a is bent upward, and the breaker body 32 is formed. It is set as the form which does not protrude from the left side part. Further, the + side terminal portion 41 in the composite member 37 extends downward as compared to the + side terminal portion 11 in the composite member 7 of the above-described embodiment, and is bent in a substantially bowl shape in cross section at the right side portion of the breaker body 32. It is made into a form. In addition, as described above, the breaker body 32 is also slightly changed in accordance with a partial change in the shapes of the − side terminal 33 and the + side terminal portion 41.

そして、本実施形態においても複合部材37並びに−側端子33はいずれも純銅で構成されている。   In this embodiment, both the composite member 37 and the negative terminal 33 are made of pure copper.

その他の部分については、前記実施形態と同様であり、図6において、前記実施形態と同じ符号を付すことによって、説明を省略する。 Other parts are the same as those in the above embodiment, and in FIG. 6, the same reference numerals as those in the above embodiment are given, and the description is omitted.

図7に示すサーキットブレーカー41は、他の実施形態であって、−側端子43が一体成形された断面略凹形のブレーカー本体42と、ブレーカー本体42の中央凹部44に収容された円板状のセラミック製サーミスター45と、サーミスター45の上側に載置されたバイメタル46と、バイメタル46の上側に位置し、ブレーカー本体42の開口を閉止する後述の複合部材47とを有している。   A circuit breaker 41 shown in FIG. 7 is another embodiment, and is a disc-shaped housing accommodated in a breaker main body 42 having a substantially concave cross section in which a negative terminal 43 is integrally formed and a central concave portion 44 of the breaker main body 42. The thermistor 45 made of ceramic, a bimetal 46 placed on the upper side of the thermistor 45, and a composite member 47 which is located on the upper side of the bimetal 46 and closes the opening of the breaker main body 42 are provided.

本実施形態に係るサーキットブレーカー41の全体的な構造は、前述した他の実施形態と同様である。すなわち、ブレーカー本体42は、合成樹脂製であって、平面から見て略方形となされ、中央には円形透孔42aが形成され、その周囲が内底面42bとなされ、更にその周囲には起立壁48が形成されている。   The overall structure of the circuit breaker 41 according to this embodiment is the same as that of the other embodiments described above. That is, the breaker body 42 is made of a synthetic resin and has a substantially square shape when viewed from above. A circular through hole 42a is formed at the center, and the periphery thereof is an inner bottom surface 42b. 48 is formed.

そして、−側端子43はブレーカー本体42の下部に一体に成形され、その右側寄り部分が断面逆凹形に成形され、該部の上面には後述する接点部材40が当接する銀製の薄肉通電板43aがクラッドされている。また、−側端子43の中央から左側部分が前記円形透孔42aの底部を構成しており、該部に前記サーミスター45が載置されている。   The negative terminal 43 is formed integrally with the lower part of the breaker main body 42, the right side portion thereof is formed with a reverse concave shape in cross section, and a silver thin-walled current plate with which a contact member 40 described later contacts the upper surface of the portion. 43a is clad. Further, the left side portion from the center of the negative side terminal 43 constitutes the bottom portion of the circular through hole 42a, and the thermistor 45 is placed on this portion.

バイメタル46の構成は、前記実施形態におけるバイメタル6と同様であり、平面から見て略方形であって、通常の正常な通電状態では上向きに湾曲した形状となっており、過電流が流れると、逆向きに反転湾曲する。   The configuration of the bimetal 46 is the same as that of the bimetal 6 in the above-described embodiment, is substantially rectangular when viewed from the plane, and has a shape curved upward in a normal normal energization state, and when an overcurrent flows, Inverted and curved in the opposite direction.

複合部材47は、ブレーカー本体42の開口を閉止し得る平面から見て略方形のカバー部47aと、カバー部47aの左側部分から垂下した略U字状の折返し部47bと、折返し部47bの右側部分から同方向へ伸びたバネ部47cとを備えており、バネ部47aの先端部には前述した銀製の接点部材40がクラッドされている。そして、前記複合部材47並びに−側端子43はいずれも純銅で構成されている。   The composite member 47 includes a substantially rectangular cover portion 47a as viewed from a plane that can close the opening of the breaker body 42, a substantially U-shaped folded portion 47b that hangs down from the left side portion of the cover portion 47a, and a right side of the folded portion 47b. A spring portion 47c extending in the same direction from the portion is provided, and the silver contact member 40 described above is clad at the tip of the spring portion 47a. The composite member 47 and the negative terminal 43 are both made of pure copper.

本実施形態のサーキットブレーカー41では、前記複合部材47における折返し部47bが+側端子となっている。そして、通常の正常な通電状態では、バイメタル46は図7に示すように、上側に湾曲した形状であり、これに伴ってバネ部47c先端の接点部材40が一方の端子43の薄肉通電板43aに当接して電流が流れる状態が維持される。   In the circuit breaker 41 of the present embodiment, the folded portion 47b of the composite member 47 is a + side terminal. In the normal normal energization state, the bimetal 46 has a shape curved upward as shown in FIG. 7, and the contact member 40 at the tip of the spring portion 47c is accompanied by the thin energization plate 43a of one terminal 43. The state where the current flows in contact with is maintained.

一方、過電流が流れた場合には、その温度上昇によって、それまで上側に湾曲していたバイメタル46が下側へ反転湾曲し、その結果、複合部材47のバネ部47cが押し上げられ、これに伴ってバネ部43先端の接点部材40が−側端子43から離れて通電が停止される。   On the other hand, when an overcurrent flows, due to the temperature rise, the bimetal 46 that has been bent upward until then is bent downward, and as a result, the spring portion 47c of the composite member 47 is pushed up. Accordingly, the contact member 40 at the tip of the spring portion 43 is separated from the negative terminal 43 and the energization is stopped.

以上述べてきた各実施形態に係るサーキットブレーカーは、いずれも端子とバネ部とカバー部とが一体化された複合部材を有するものであったが、本発明はこれに限定されるものではなく、背景技術で述べた図8〜図10に見られる構造のサーキットブレーカー51について、その−側端子55と+側端子54およびバネ部材56のすべてを純銅で構成したものも含まれる。   The circuit breaker according to each embodiment described above has a composite member in which the terminal, the spring part, and the cover part are integrated, but the present invention is not limited to this, The circuit breaker 51 having the structure shown in FIGS. 8 to 10 described in the background art includes those in which the negative terminal 55, the positive terminal 54, and the spring member 56 are all made of pure copper.

本発明に係るサーキットブレーカーは、確実な作動性と高い通電性が得られるため、幅広い利用が期待できる。   The circuit breaker according to the present invention can be expected to be widely used since reliable operability and high electrical conductivity can be obtained.

1 小型サーキットブレーカー
2 ブレーカー本体
3 −側端子
5 サーミスター
6 バイメタル
7 複合部材
8 起立壁
11 端子部
12 カバー部
13 バネ部
13a 接点部材
DESCRIPTION OF SYMBOLS 1 Small circuit breaker 2 Breaker main body 3-side terminal 5 Thermistor 6 Bimetal 7 Composite member 8 Standing wall 11 Terminal part 12 Cover part 13 Spring part 13a Contact member

Claims (2)

ブレーカー本体に取り付けられた一対の端子と、基端部が一方の端子に接合され、先端部に接点部材がクラッドされてなるバネ部材とを有するサーキットブレーカーにおいて、前記一対の端子並びにバネ部材がいずれも純銅で構成されていることを特徴とする、サーキットブレーカー。 In a circuit breaker having a pair of terminals attached to a breaker body and a spring member in which a base end portion is joined to one terminal and a contact member is clad at a tip end portion, the pair of terminals and the spring member are either A circuit breaker that is also made of pure copper. 断面略凹形のブレーカー本体と、ブレーカー本体の下部に一体に組み込まれた一方の端子と、他方の端子並びにブレーカー本体の上部開口を閉止するカバー部および先端部に接点部材がクラッドされたバネ部材が一体に連成された複合部材とを有するサーキットブレーカーにおいて、前記一対の端子並びにバネ部材がいずれも純銅で構成されていることを特徴とする、サーキットブレーカー。 Breaker body having a substantially concave cross section, one terminal integrated into the lower part of the breaker body, a cover part for closing the other terminal and the upper opening of the breaker body, and a spring member with a contact member clad on the tip part A circuit breaker having a composite member integrally formed with each other, wherein the pair of terminals and the spring member are both made of pure copper.
JP2011151828A 2011-07-08 2011-07-08 Circuit breaker Withdrawn JP2013020756A (en)

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