JP2011134624A - Bimetal circuit breaker - Google Patents

Bimetal circuit breaker Download PDF

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JP2011134624A
JP2011134624A JP2009293741A JP2009293741A JP2011134624A JP 2011134624 A JP2011134624 A JP 2011134624A JP 2009293741 A JP2009293741 A JP 2009293741A JP 2009293741 A JP2009293741 A JP 2009293741A JP 2011134624 A JP2011134624 A JP 2011134624A
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circuit breaker
terminal
breaker
breaker body
composite member
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JP4592117B1 (en
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Yukihiro Azuchi
行博 安土
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II P I KK
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Abstract

<P>PROBLEM TO BE SOLVED: To enable to decrease the number of component parts, downsize a whole body, and facilitate assembling work. <P>SOLUTION: The circuit breaker is provided with a breaker body 2 with a cross-section of nearly a concave shape, one of the terminals 3 integrally built in at a lower part of the breaker body 2, a thermistor 5 arranged on the terminal 3, a curved bimetal 6 loaded on the thermistor 5, and a composite member 7 with a spring 13 integrally prepared at one side edge of a cover 12 closing a top opening of the breaker body 2 and bent downward and with the other terminal 11 integrally formed at the other side edge of the cover 12. At the tip of the spring 13 in the composite member 7, a contact member 13a in contact with the terminal 3 is fixed. <P>COPYRIGHT: (C)2011,JPO&INPIT

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、その発熱によってバイメタルが反転湾曲して電路を遮断するバイメタル式サーキットブレーカーの構造に関する。   The present invention relates to a structure of a bimetal circuit breaker in which, when an overcurrent flows in an electric circuit in a power device or the like, the bimetal is inverted and bent by heat generation to interrupt an electric circuit.

図７〜図９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. 7 to 9, 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

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７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に接触しており、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８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. 8, 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.

上記構造の小型サーキットブレーカー５１を製造する場合、下側ケース部材５３Ａと上側ケース部材５３Ｂの端縁同士を超音波溶接（Ｗ１）する必要があると共に、板状バネ部材５６の基端部を＋側端子５４の上段部５４ａにレーザー溶接（Ｗ２）する作業が必要となり、これら作業に手間と時間を要するという問題があった。   When manufacturing the small circuit breaker 51 having the above structure, it is necessary to ultrasonically weld (W1) the edges of the lower case member 53A and the upper case member 53B, and the base end portion of the plate spring member 56 is + There has been a problem that operations for performing laser welding (W2) on the upper stage portion 54a of the side terminal 54 are required, and these operations require labor and time.

また、前述した従来の小型サーキットブレーカー５１の場合、基本的に下側ケース部材５３Ａ、上側ケース部材５３Ｂ、板状バネ部材５６、サーミスター５８およびバイメタル５９の合計５個の部材から構成され、部品点数が多いことから、それらの組み立て自体に多くの工程が必要となり、そのため製造コストがかかると共に、各部品の管理にも手間を要するという問題もあった。   Further, the conventional small circuit breaker 51 described above is basically composed of a total of five members: a lower case member 53A, an upper case member 53B, a plate spring member 56, a thermistor 58, and a bimetal 59. Since the number of points is large, many processes are required for assembling them, which causes a problem in that the manufacturing cost is high and the management of each part is also troublesome.

本発明の目的は、構成部品の数を減らすと共にそれらの組み立て作業の効率化を図ることができ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 capable of reducing the number of components and improving the efficiency of their assembly work.

請求項１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、一方の端子上に配置されたサーミスターと、サーミスター上に載置された湾曲状のバイメタルと、ブレーカー本体の上部開口を閉止するカバー部の一側縁にその下側へ屈曲してバネ部が一体に設けられ、カバー部の他側縁には他方の端子が一体に形成されてなる複合部材とを有し、複合部材におけるバネ部の先端には一方の端子に接触する接点部材が固定されたサーキットブレーカーである。 A first aspect of the present invention is a breaker body having a substantially concave cross section, one terminal integrated into a lower portion of the breaker body, a thermistor disposed on one terminal, and a thermistor. The bent bimetal that is placed and the one side edge of the cover part that closes the upper opening of the breaker body are bent downward, and the spring part is integrally provided, and the other terminal on the other side edge of the cover part Is a circuit breaker in which a contact member that contacts one terminal is fixed to the tip of a spring portion of the composite member.

請求項２記載の本発明は、前記請求項１記載のサーキットブレーカーについて、複合部材のカバー部がブレーカー本体の上縁部分によってかしめられていることを特徴とするものである。 According to a second aspect of the present invention, in the circuit breaker according to the first aspect, the cover portion of the composite member is caulked by the upper edge portion of the breaker body.

請求項３記載の本発明は、前記請求項１または請求項２記載のサーキットブレーカーについて、表面実装が可能となされていることを特徴とするものである。 According to a third aspect of the present invention, the circuit breaker according to the first or second aspect can be surface-mounted.

本発明に係るサーキットブレーカーは、接点を有するバネ部と一体に端子部が形成された複合部材を有するため、従来のように、バネ部材の一端をレーザー溶接によって端子に接合する必要がない。そのため、この種作業に要していた手間と時間が省略される。   Since the circuit breaker according to the present invention includes the composite member in which the terminal portion is formed integrally with the spring portion having the contact, it is not necessary to join one end of the spring member to the terminal by laser welding as in the related art. Therefore, the labor and time required for this kind of work are omitted.

また、本発明では、複合部材におけるカバー部によって、ブレーカー本体の開口が閉止される構造であるため、従来のサーキットブレーカーにおける上側ケース部材が省略され、これが前述したバネ部材と端子との一体化と相俟って部品点数を減少させることができ、またその管理も容易となる。   Further, in the present invention, since the opening of the breaker body is closed by the cover portion in the composite member, the upper case member in the conventional circuit breaker is omitted, and this is the integration of the spring member and the terminal described above. Together, the number of parts can be reduced, and the management thereof becomes easy.

更に、複合部材におけるカバー部をブレーカー本体の上縁でかしめるようにした本発明によれば、従来の上側ケース部材と下側ケース部材との超音波溶接が不要となるため、更なる製造作業の簡略化が可能となる。   Furthermore, according to the present invention in which the cover portion of the composite member is caulked at the upper edge of the breaker body, conventional ultrasonic welding between the upper case member and the lower case member is not required, so that further manufacturing work can be performed. Can be simplified.

また、本発明のサーキットブレーカーは従来品に比べて、その外形を小さくすることができる利点もある。   Further, the circuit breaker of the present invention has an advantage that its outer shape can be reduced as compared with the conventional product.

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. 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、−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。 The negative terminal 3 is formed integrally with the lower part of the breaker body 2, and a concave portion 3 a that forms the bottom surface of the circular through hole 2 a is formed on the right side portion, and the thermistor 5 is accommodated in this portion. .

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。   The bimetal 6 has a substantially square shape when viewed from the plane, 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よりの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。そして、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。   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. The spring part 13 is provided. 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 has a narrower band shape than the cover portion 12, and a silver contact member 13a is clad at the tip portion. In short, the composite member 7 has the three functions of a positive terminal, a cover for closing the breaker body 2 and a contact spring for controlling energization.

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の接点部材１３ａが−側端子３に接触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 contact of the spring portion 13 in the composite member 7. The state in which the member 13a contacts the negative terminal 3 and 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。   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, and accordingly, the contact member 13a at the tip of the spring portion 13 is separated from the negative terminal 3 to stop energization.

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。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、同じ符号を付すことによって、説明を省略する。   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. The other parts are the same as those in the above embodiment, and the description is omitted by giving the same reference numerals 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。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、同じ符号を付すことによって、説明を省略する。   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. Other parts are the same as those in the above-described embodiment, and in FIG.

本発明に係るサーキットブレーカーは、より小型でしかも簡単な組立て作業で製造することができるため、幅広い利用が期待できる。   Since the circuit breaker according to the present invention can be manufactured by a smaller and simple assembly operation, it can be expected to be widely used.

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 (3)

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、一方の端子上に配置されたサーミスターと、サーミスター上に載置された湾曲状のバイメタルと、ブレーカー本体の上部開口を閉止するカバー部の一側縁にその下側へ屈曲してバネ部が一体に設けられ、カバー部の他側縁には他方の端子が一体に形成されてなる複合部材とを有し、複合部材におけるバネ部の先端には一方の端子に接触する接点部材が固定された、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 thermistor disposed on one terminal, a curved bimetal placed on the thermistor, A composite member in which a spring portion is integrally provided at one side edge of the cover portion that closes the upper opening of the breaker body, and the other terminal is integrally formed at the other side edge of the cover portion. A circuit breaker in which a contact member that contacts one terminal is fixed to the tip of the spring portion of the composite member. 複合部材のカバー部がブレーカー本体の上縁部分によってかしめられている、請求項１記載のサーキットブレーカー。   The circuit breaker according to claim 1, wherein the cover portion of the composite member is caulked by an upper edge portion of the breaker body. 表面実装可能となされた、請求項１または請求項２記載のサーキットブレーカー。   The circuit breaker according to claim 1 or 2, wherein the circuit breaker can be surface mounted.
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