JPH0320852B2 - - Google Patents

Description

【発明の詳細な説明】 本発明は負荷の開閉制御に用いられる電磁継電
器に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic relay used for controlling switching of a load.

従来、この種の電磁継電器で交流負荷をしや断
するとき、しや断時の電流位相が一定していない
ため、位相によつては接点間に発生するアークが
半サイクルもの間持続することがあり、接点の消
耗が激しく、接点回路の絶縁劣化をきたす欠点が
あつた。 Conventionally, when an AC load is interrupted with this type of electromagnetic relay, the current phase at the time of interruption is not constant, so depending on the phase, the arc that occurs between the contacts can last for half a cycle. The disadvantage was that the contacts were subject to severe wear and tear, leading to deterioration of the insulation of the contact circuit.

本発明はかかる欠点に鑑みてなされたもので、
接点を流れる負荷電流による吸引力の作用によつ
て、負荷電流零付近の位相で負荷をしや断し、ア
ークの発生を防止した電磁継電器を提供すること
を目的とする。 The present invention has been made in view of these drawbacks.
It is an object of the present invention to provide an electromagnetic relay that interrupts a load at a phase near zero load current by the action of attractive force caused by the load current flowing through the contacts, and prevents arcing.

以下、本発明を一実施例である添付図面にした
がつて説明する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, which are examples of the present invention.

第１図〜第４図において、１はＩ字形状の鉄
心、２は一端に固定接点３を取付け、他端を端子
部２ａとした第１接触片で、これら鉄心１と第１
接触片２とを重ねてスプール４中にインサート成
形してあり、スプール４の胴部にはコイル５が巻
回されている。６はスプール４の外周に遊嵌合す
る口字形状の可動鉄片、８は可動鉄片６の上面に
同形状の絶縁板７を介して接着固定された略口字
形状の第２接触片で、第２接触片８は導電性ばね
板からなり、その一端には上記固定接点３と対向
する可動接点９を有し、他端には第１接触片２の
端子部２ａと平行に突出する端子部８ａが形成さ
れている。可動鉄片６はこの第２接触片８によつ
て揺動自在にヒンジされ、一辺部６ａが鉄心１の
一端巾広部１ａに当接するとともに、反対側辺部
６ｂが鉄心１の他端巾広部１ｂと対向して吸着部
を構成している。なお、可動鉄片６の吸着部側辺
部６ｂには第１接触片２と接触しないように切欠
６ｃが設けられている（第１図参照）。 1 to 4, 1 is an I-shaped iron core, 2 is a first contact piece with a fixed contact 3 attached to one end, and a terminal portion 2a at the other end;
The contact piece 2 is overlapped with the spool 4 by insert molding, and a coil 5 is wound around the body of the spool 4. Reference numeral 6 denotes a movable iron piece having a mouth shape that loosely fits around the outer periphery of the spool 4; numeral 8 represents a second contact piece having a substantially mouth shape that is adhesively fixed to the upper surface of the movable iron piece 6 via an insulating plate 7 having the same shape; The second contact piece 8 is made of a conductive spring plate, and has a movable contact 9 facing the fixed contact 3 at one end thereof, and a terminal protruding parallel to the terminal portion 2a of the first contact piece 2 at the other end. A portion 8a is formed. The movable iron piece 6 is swingably hinged by the second contact piece 8, and one side 6a abuts one wide end 1a of the iron core 1, and the opposite side 6b contacts the other wide end 1a of the iron core 1. A suction section is configured opposite to section 1b. Note that a notch 6c is provided in the suction portion side portion 6b of the movable iron piece 6 so as not to come into contact with the first contact piece 2 (see FIG. 1).

端子台１０は一方側に鉄心１およびスプール４
を固定し、かつ第１、第２接触片２，８の端子部
２ａ，８ａを挿着固定したもので、端子部２ａ，
８ａには交流電源および負荷が持続されている。
この端子台１０はスプール４と一体成形してもよ
く、また接触片２，８の端子部２ａ，８ａとは別
体の外部端子を端子台１０の他方側に突設し、こ
の外部端子に上記接触片２，８の端子部２ａ，８
ａを接続してもよい。 The terminal block 10 has an iron core 1 and a spool 4 on one side.
is fixed, and the terminal parts 2a, 8a of the first and second contact pieces 2, 8 are inserted and fixed, and the terminal parts 2a,
An AC power source and a load are maintained at 8a.
This terminal block 10 may be integrally molded with the spool 4, and an external terminal separate from the terminal parts 2a and 8a of the contact pieces 2 and 8 is provided protruding from the other side of the terminal block 10. Terminal portions 2a, 8 of the contact pieces 2, 8
You may also connect a.

つぎに、この電磁継電器の動作を第５図にした
がつて説明する。 Next, the operation of this electromagnetic relay will be explained with reference to FIG.

まず、t1時においてコイル５に入力信号を加え
ると、可動鉄片６は第２接触片８のばね力に抗し
て鉄心１に吸引され、微少時間後のt2時に可動鉄
片６が鉄心１に吸着されてこの吸着部で第１接触
片２の周囲に閉磁路が形成されるとともに、接点
３，９が閉成する。これにより、接点３，９を介
して負荷電流が流れ、鉄心１と可動鉄片６との吸
着部間にはコイル５による磁束Φ１（第３図照）
と負荷電流による磁束Φ２（第４図参照）とが発
生する。そのため、コイル５による吸引力と負荷
電流による吸引力との合成力が電磁継電器の吸引
力となる。この吸引力は負荷電流の変動に応じて
時間とともに変動する。 First, when an input signal is applied to the coil 5 at time t1, the movable iron piece 6 is attracted to the iron core 1 against the spring force of the second contact piece 8, and after a short time, at t2, the movable iron piece 6 is attracted to the iron core 1. Then, a closed magnetic path is formed around the first contact piece 2 at this attraction part, and the contacts 3 and 9 are closed. As a result, a load current flows through the contacts 3 and 9, and a magnetic flux Φ1 due to the coil 5 is generated between the attraction portion of the iron core 1 and the movable iron piece 6 (see Figure 3).
and a magnetic flux Φ2 (see FIG. 4) due to the load current are generated. Therefore, the combined force of the attraction force by the coil 5 and the attraction force by the load current becomes the attraction force of the electromagnetic relay. This attractive force varies over time in response to variations in load current.

いま、t3時において、コイル５への入力信号を
切ると、可動鉄片６は第２接触片８のばね力によ
つて復帰しようとするが、負荷電流のt3時におけ
る位相電流値が大きいため、負荷電流による磁速
Φ２によつて可動鉄片６は鉄心１に吸着され続け
る。 Now, when the input signal to the coil 5 is cut off at time t3, the movable iron piece 6 attempts to return to its original state due to the spring force of the second contact piece 8, but since the phase current value of the load current at time t3 is large, The movable iron piece 6 continues to be attracted to the iron core 1 due to the magnetic velocity Φ2 caused by the load current.

そして、負荷電流が時間とともに小さくなり、
位相が零付近になると、第２接触片８による復帰
力と負荷電流による吸引力とが等しくなり、この
点（t4時）において可動鉄片６は復帰し、接点は
開離する。したがつて、負荷しや断時のアークは
ほとんど発生しない。実際に接点が開離するの
は、可動鉄片６の慣性モーメントのためにt4時よ
り若干遅れ、負荷電流の位相が零点に更に近づ
く。そのため、負荷しや断時のアークは更に少な
くなる。 Then, the load current decreases over time,
When the phase becomes near zero, the return force by the second contact piece 8 and the attraction force by the load current become equal, and at this point (time t4), the movable iron piece 6 returns and the contacts open. Therefore, arcing hardly occurs when the load is on or off. The actual opening of the contacts is delayed slightly from time t4 due to the moment of inertia of the movable iron piece 6, and the phase of the load current approaches the zero point. Therefore, arcing during loading and unloading is further reduced.

上記実施例では、Ｉ字形鉄心１と口字形可動鉄
片６とを用い、吸着面として板厚面を使用してい
るので、鉄心１および可動鉄片６を薄肉板で構成
でき、薄型化が可能であるとともに、可動鉄片６
のストロークの精度が高く、かつ吸着面を大きく
取れるため高感度の電磁継電器を得ることができ
る。また、コイル５の一端側にヒンジ構造を有
し、他端側に接点部を有し、端子部をヒンジ部側
から突出させたので、端子部を簡単に引き出すこ
とができ、組立、調整が容易である。 In the above embodiment, the I-shaped iron core 1 and the mouth-shaped movable iron piece 6 are used, and the thick plate surface is used as the suction surface, so the iron core 1 and the movable iron piece 6 can be constructed from thin plates, and the thickness can be reduced. Along with the movable iron piece 6
Since the stroke accuracy is high and the suction surface can be large, a highly sensitive electromagnetic relay can be obtained. In addition, the coil 5 has a hinge structure on one end side, a contact part on the other end side, and the terminal part protrudes from the hinge part side, so the terminal part can be easily pulled out and assembly and adjustment are easy. It's easy.

なお、本発明にかかる電磁継電器は、上記実施
例のごとく可動鉄片６に第２接触片８を取付けた
ものに限らず、可動鉄片６がカードを介して第２
接触片８を駆動するものでもよい。 It should be noted that the electromagnetic relay according to the present invention is not limited to the one in which the second contact piece 8 is attached to the movable iron piece 6 as in the above embodiment;
It may also be one that drives the contact piece 8.

以上の説明で明らかなように、本発明によれ
ば、コイル内に鉄心と第１接触片とを挿通配置す
るとともに、可動鉄片の鉄心への吸引動作に連動
して第１接触片と接触する第２接触片を設け、可
動鉄片が鉄心に吸着されたとき鉄心と可動鉄片と
の吸着部で第１接触片の周囲に閉磁路を形成する
ようにするとともに、上記第２接触片の復帰力を
交流負荷電流の零位相近傍における上記可動鉄片
の吸引力とほぼ等しくしたので、交流負荷をしや
断するとき、常に負荷電流零付近の位相で負荷を
しや断することができる。したがつて、アームの
発生を抑制でき、接点消耗や絶縁劣化といつた問
題を解消できる。しかも、上記閉磁路を形成する
ために特定の磁気回路部品を設ける必要がないの
で、構造が複雑化することがない。 As is clear from the above description, according to the present invention, the iron core and the first contact piece are inserted into the coil, and are brought into contact with the first contact piece in conjunction with the suction operation of the movable iron piece to the iron core. A second contact piece is provided so that when the movable iron piece is attracted to the iron core, a closed magnetic path is formed around the first contact piece at the attraction part between the iron core and the movable iron piece, and the return force of the second contact piece is is made almost equal to the attractive force of the movable iron piece near the zero phase of the AC load current, so when cutting off the AC load, the load can always be cut off at a phase near the zero phase of the load current. Therefore, the occurrence of arms can be suppressed, and problems such as contact wear and insulation deterioration can be solved. Moreover, since it is not necessary to provide specific magnetic circuit components to form the closed magnetic path, the structure does not become complicated.

また、負荷電流による磁束は、最も磁束が効率
よく作用する吸着部に形成されるので、小さな負
荷電流でも高感度の零しや断が可能である。さら
に、第１接触片がコイル中を通過しているため、
第１接触片をスペース効率よく簡単に設置でき、
電磁継電器全体としてコンパクト化できる。 In addition, since the magnetic flux due to the load current is formed in the attracting portion where the magnetic flux acts most efficiently, highly sensitive zeroing and breaking can be performed even with a small load current. Furthermore, since the first contact piece passes through the coil,
The first contact piece can be installed easily and space-efficiently,
The electromagnetic relay as a whole can be made more compact.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明にかかる電磁継電器の斜視図、
第２図はその平面図、第３図は非通電時の正面
図、第４図は通電時の左側面図、第５図はその動
作説明図である。 １……鉄心、２……第１接触片、２ａ……端子
部、３……固定接点、４……スプール、５……コ
イル、６……可動鉄片、７……絶縁板、８……第
２接触片、８ａ……端子部、９……可動接点。 FIG. 1 is a perspective view of an electromagnetic relay according to the present invention;
2 is a plan view thereof, FIG. 3 is a front view when not energized, FIG. 4 is a left side view when energized, and FIG. 5 is an explanatory diagram of its operation. DESCRIPTION OF SYMBOLS 1... Iron core, 2... First contact piece, 2a... Terminal part, 3... Fixed contact, 4... Spool, 5... Coil, 6... Movable iron piece, 7... Insulating plate, 8... Second contact piece, 8a... terminal portion, 9... movable contact.

Claims (1)

【特許請求の範囲】 １ コイル内に鉄心と第１接触片とを挿通配置す
るとともに、可動鉄片の鉄心への吸引動作に連動
して第１接触片と接触する第２接触片を設け、可
動鉄片が鉄心に吸着されたとき鉄心と可動鉄片と
の吸着部で第１接触片の周囲に閉磁路を形成する
ようにするとともに、上記第２接触片の復帰力を
交流負荷電流の零位相近傍における上記可動鉄片
の吸引力とほぼ等しくしたことを特徴とする電磁
継電器。 ２ 鉄心を両端部が巾広なＩ字形状とし、可動鉄
片をコイルを巻回したスプールの外周に遊嵌合す
る口字形状とし、この可動鉄片の一辺部を鉄心の
一端巾広部にヒンジするとともに、可動鉄片の反
対側辺部と鉄心の他端巾広部とを吸着部としたこ
とを特徴とする特許請求の範囲第１項記載の電磁
継電器。 ３ 可動鉄片の上面に絶縁板を介して第２接触片
を固定し、この第２接触片の一端端子部を第１接
触片の端子部と平行に突出させるとともに、第２
接触片の他端部に第１接触片の接点と接離する接
点を設けたことを特徴とする特許請求の範囲第１
項又は第２項記載の電磁継電器。[Scope of Claims] 1. An iron core and a first contact piece are inserted into the coil, and a second contact piece is provided that contacts the first contact piece in conjunction with the suction operation of the movable iron piece to the iron core. When the iron piece is attracted to the iron core, a closed magnetic path is formed around the first contact piece at the adhesion part between the iron core and the movable iron piece, and the return force of the second contact piece is adjusted to near the zero phase of the AC load current. An electromagnetic relay characterized in that the attractive force of the movable iron piece is approximately equal to that of the movable iron piece. 2 The iron core has a wide I-shape at both ends, the movable iron piece has a mouth shape that loosely fits around the outer periphery of the spool around which the coil is wound, and one side of this movable iron piece is hinged to the wide part at one end of the iron core. The electromagnetic relay according to claim 1, wherein the opposite side of the movable iron piece and the other wide end of the iron core are used as adsorption parts. 3. A second contact piece is fixed to the upper surface of the movable iron piece via an insulating plate, one end terminal part of this second contact piece is made to protrude parallel to the terminal part of the first contact piece, and the second contact piece
Claim 1, characterized in that the other end of the contact piece is provided with a contact that makes contact with and separates from the contact of the first contact piece.
The electromagnetic relay according to paragraph 2 or paragraph 2.