JP7487852B2 - Electromagnetic Contactor - Google Patents

Electromagnetic Contactor Download PDF

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JP7487852B2
JP7487852B2 JP2023573905A JP2023573905A JP7487852B2 JP 7487852 B2 JP7487852 B2 JP 7487852B2 JP 2023573905 A JP2023573905 A JP 2023573905A JP 2023573905 A JP2023573905 A JP 2023573905A JP 7487852 B2 JP7487852 B2 JP 7487852B2
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engagement
cover
arc
extinguishing
case
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JPWO2023135992A1 (en
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充哉 伊藤
幸悦 高谷
翔太 菊地
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Fuji Electric FA Components and Systems Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays

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  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Switch Cases, Indication, And Locking (AREA)

Description

本発明は、電磁接触器に係わり、特に消弧カバーを保持する構造に関する。 The present invention relates to an electromagnetic contactor, and in particular to a structure for holding an arc-extinguishing cover.

電磁接触器は、絶縁性を有する合成樹脂材で形成した下ケース及び上ケースを備えており、上ケースには、接点をそれぞれ有する端子部が固定されているとともに、上ケース内の消弧室に可動接点及び固定接点を備えた接点部が収納されている。下ケース内には、接点部を駆動させる電磁石が収納されている。そして、上ケースには消弧室内の接点部を覆う消弧カバーが装着されている。 The electromagnetic contactor comprises a lower case and an upper case made of insulating synthetic resin material, with terminal parts each having a contact fixed to the upper case, and a contact part having a movable contact and a fixed contact housed in an arc extinguishing chamber in the upper case. An electromagnet that drives the contact part is housed in the lower case. An arc extinguishing cover that covers the contact part in the arc extinguishing chamber is attached to the upper case.

短絡事故などで電磁接触器の接点部に異常な大電流が流れると、発生したアークガスによる消弧室の内圧上昇によって消弧カバーが吹き飛ぶおそれがある。そのため、例えば特許文献１の電磁接触器は、上ケースと消弧カバーの一方に第１係合部及び第２係合部を形成し、他方に第１係合部及び第２係合部に係合する第３係合部を形成し、第１係合部と第３係合部とを係合させる第１係合状態とすることで消弧カバーを上ケースに装着し、第２係合部と第３係合部を係合させる第２係合状態とすることで消弧カバーと上ケースとの間に隙間を形成し、発生したアークガスを外部に放出させて消弧室の内圧を減少させるようにしている。If an abnormally large current flows through the contacts of the electromagnetic contactor due to a short circuit or other accident, the arc gas generated may cause the arc-extinguishing cover to be blown off due to an increase in internal pressure in the arc-extinguishing chamber, which may result in the arc-extinguishing cover being blown off. For this reason, for example, the electromagnetic contactor of Patent Document 1 forms a first engagement portion and a second engagement portion on one side of the upper case and the arc-extinguishing cover, and forms a third engagement portion that engages with the first engagement portion and the second engagement portion on the other side. The arc-extinguishing cover is attached to the upper case by engaging the first engagement portion with the third engagement portion in a first engagement state, and a gap is formed between the arc-extinguishing cover and the upper case by engaging the second engagement portion with the third engagement portion in a second engagement state, which releases the generated arc gas to the outside and reduces the internal pressure in the arc-extinguishing chamber.

特開２０２１－１１４５０号公報JP 2021-11450 A

しかし、特許文献１の電磁接触器は、第１係合状態から第２係合状態に移行する際に、第３係合部が損傷してしまうと、損傷した第３係合部と第２係合部との係合力が低くなり、第２係合状態を保持できない消弧カバーが上ケースから吹き飛ぶおそれがある。
そこで、本発明は、第１係合状態から第２係合状態に移行する際のケースに対する消弧カバーの係合力の低下を防止することで、消弧室に発生したアークガスを外部に放出しつつ消弧カバーの吹き飛びを確実に防止することができる電磁接触器を提供することを目的としている。 However, in the electromagnetic contactor of Patent Document 1, if the third engagement portion is damaged when transitioning from the first engagement state to the second engagement state, the engagement force between the damaged third engagement portion and the second engagement portion will be reduced, and the arc-extinguishing cover, which cannot maintain the second engagement state, may be blown off from the upper case.
Therefore, the present invention aims to provide an electromagnetic contactor that can reliably prevent the arc extinguishing cover from being blown away while releasing the arc gas generated in the arc extinguishing chamber to the outside by preventing a decrease in the engagement force of the arc extinguishing cover with respect to the case when transitioning from the first engagement state to the second engagement state.

上記目的を達成するために、本発明の一態様に係る電磁接触器は、可動接点と固定接点とを有する接点部を消弧室に収納したケースと、消弧室を覆ってケースに装着される消弧カバーと、を備えた電磁接触器において、消弧カバーは、ケースに対する装着方向に離間して第１係合部及び第２係合部が形成され、ケースは、第３係合部及び第４係合部が形成されており、第１係合部及び第３係合部が係合した第１係合状態で、消弧カバーが消弧室を密閉して前記ケースに装着され、第２係合部及び第４係合部が係合した第２係合状態で、消弧カバーとケースの間に隙間を設けた状態でケースに消弧カバーが保持されるようにした。 In order to achieve the above object, an electromagnetic contactor according to one embodiment of the present invention is an electromagnetic contactor comprising a case in which a contact unit having a movable contact and a fixed contact is housed in an arc-extinguishing chamber, and an arc-extinguishing cover which is attached to the case to cover the arc-extinguishing chamber, wherein the arc-extinguishing cover has a first engagement portion and a second engagement portion which are spaced apart in the direction of attachment to the case, and the case has a third engagement portion and a fourth engagement portion which are formed such that in a first engagement state in which the first engagement portion and the third engagement portion are engaged, the arc-extinguishing cover is attached to the case sealingly sealing the arc-extinguishing chamber, and in a second engagement state in which the second engagement portion and the fourth engagement portion are engaged, the arc-extinguishing cover is held on the case with a gap provided between the arc-extinguishing cover and the case.

本発明に係る一態様の電磁接触器によれば、消弧カバーがケースに装着されている第１係合状態から消弧カバーとケースの間に隙間を設けた第２係合状態に移行する際に、ケースに対する消弧カバーの係合力の低下を確実に防止することで、消弧室に発生したアークガスを外部に放出しつつ消弧カバーの吹き飛びを確実に防止することができる。 According to one aspect of the electromagnetic contactor of the present invention, when transitioning from a first engagement state in which the arc-extinguishing cover is attached to the case to a second engagement state in which a gap is provided between the arc-extinguishing cover and the case, a decrease in the engagement force of the arc-extinguishing cover with respect to the case is reliably prevented, thereby making it possible to reliably prevent the arc-extinguishing cover from being blown away while releasing arc gas generated in the arc-extinguishing chamber to the outside.

本発明に係る１実施形態の電磁接触器を示す斜視図である。1 is a perspective view showing an electromagnetic contactor according to an embodiment of the present invention; 電磁接触器を消弧カバー側から示した図である。FIG. 4 is a view showing the electromagnetic contactor from the arc-extinguishing cover side. 電磁接触器の上ケースから消弧カバーを外した状態を示す図である。FIG. 4 is a diagram showing a state in which an arc-extinguishing cover is removed from an upper case of the electromagnetic contactor. 図２におけるIV－IV線矢視の要部断面図である。4 is a cross-sectional view of a main part taken along line IV-IV in FIG. 2. 消弧カバーを前側から示した図である。FIG. 消弧カバーを後側から示した図である。FIG. 消弧カバーを外した上ケース側の形状を示す斜視図である。FIG. 4 is a perspective view showing the shape of the upper case side with the arc-extinguishing cover removed. 消弧カバーを外した上ケース側の形状を前側から示した図である。FIG. 13 is a front view showing the shape of the upper case with the arc-extinguishing cover removed. 図２におけるX－X線矢視の要部断面図であり、消弧カバーが上ケースに装着されている第１係合状態を示す図である。3 is a cross-sectional view of a main portion taken along the line XX in FIG. 2, showing a first engagement state in which the arc-extinguishing cover is attached to the upper case. 消弧カバーが上ケースに隙間を設けて装着されている第２係合状態を示す要部断面図である。13 is a cross-sectional view of a main portion showing a second engaged state in which the arc-extinguishing cover is attached to the upper case with a gap therebetween. FIG.

次に、図面を参照して、本発明に係る実施形態を説明する。以下の図面の記載において、同一又は類似の部分には同一又は類似の符号を付している。ただし、図面は模式的なものであり、厚みと平面寸法との関係、各層の厚みの比率等は現実のものとは異なることに留意すべきである。したがって、具体的な厚みや寸法は以下の説明を参酌して判断すべきものである。また、図面相互間においても互いの寸法の関係や比率が異なる部分が含まれていることはもちろんである。Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, identical or similar parts are given the same or similar symbols. However, it should be noted that the drawings are schematic, and the relationship between thickness and planar dimensions, the thickness ratio of each layer, etc., differ from the actual ones. Therefore, specific thicknesses and dimensions should be determined with reference to the following explanation. In addition, it goes without saying that the drawings include parts with different dimensional relationships and ratios.

また、以下に示す実施形態は、本発明の技術的思想を具体化するための装置や方法を例示するものであって、本発明の技術的思想は、構成部品の材質、形状、構造、配置等を下記のものに特定するものでない。本発明の技術的思想は、特許請求の範囲に記載された請求項が規定する技術的範囲内において、種々の変更を加えることができる。
なお、以下の説明で記載されている「左」、「右」、「前」、「後」、「上」及び「下」の用語は、図１で示す方向を参照して用いられている。 In addition, the embodiments shown below are merely examples of devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention does not specify the materials, shapes, structures, arrangements, etc. of the components to those described below. The technical idea of the present invention can be modified in various ways within the technical scope defined by the claims.
In the following description, the terms "left", "right", "front", "rear", "upper" and "lower" are used with reference to the directions shown in FIG.

図１及び図２に示すように、本発明に係る１実施形態を示す電磁接触器１は、上下に分割され、絶縁性を有する合成樹脂材で形成された下ケース２及び上ケース３を備えている。上ケース３には、主回路の電源側端子部４ａ１～４ｃ１、主回路の負荷側端子部４ａ２～４ｃ２、補助電源側端子部４ｄ１，補助負荷側端子部４ｄ２が配置されているともに、後述する消弧室１２を密閉する消弧カバー７が装着されている。下ケース２内には、後述する接点部６を駆動させる電磁石（不図示）が収納されているともに、下ケース２に電磁石用の一対のコイル端子４ｅが固定されている。 As shown in Figures 1 and 2, an electromagnetic contactor 1 showing one embodiment of the present invention is divided into upper and lower halves and includes a lower case 2 and an upper case 3 made of an insulating synthetic resin material. The upper case 3 is arranged with the power supply side terminals 4a1-4c1 of the main circuit, the load side terminals 4a2-4c2 of the main circuit, the auxiliary power supply side terminal 4d1, and the auxiliary load side terminal 4d2, and is fitted with an arc-extinguishing cover 7 that seals the arc-extinguishing chamber 12, which will be described later. An electromagnet (not shown) that drives the contacts 6, which will be described later, is housed within the lower case 2, and a pair of coil terminals 4e for the electromagnet are fixed to the lower case 2.

図３は、電磁接触器１の上ケース３から消弧カバー７を取り外した状態を示すものである。上ケース３には、左右方向に離間して前後方向に連続して延在する一対の主回路用ケース壁１０ａ，１０ｂが形成され、主回路用ケース壁１０ａ，１０ｂの間を平行に仕切り、互いに前後方向に離間して２対のケース隔壁１１ａ１，１１ａ２及び１１ｂ１，１１ｂ２が形成されている。また、主回路用ケース壁１０ａの外側に平行に補助回路用ケース壁１１ｃが形成されている。そして、一対の主回路用ケース壁１０ａ，１０ｂとケース隔壁１１ａ１，１１ａ１及び１１ｂ１，１１ｂ２の間に主回路の電源側端子部４ａ１～４ｃ１、主回路の負荷側端子部４ａ２～４ｃ２が配置され、主回路用ケース壁１０ａと補助回路用ケース壁１１ｃとの間に補助電源側端子部４ｄ１及び補助負荷側端子部４ｄ２が配置されている。
そして、上ケース３の一対の主回路用ケース壁１０ａ，１０ｂ及びケース隔壁１１ａ，１１ｂで囲まれた中央部に接点部６が配置されており、上ケース３に消弧カバー７を装着することで、図４に示すように、密閉された消弧室１２が設けられている。 3 shows the state in which the arc-extinguishing cover 7 is removed from the upper case 3 of the electromagnetic contactor 1. A pair of main circuit case walls 10a, 10b are formed in the upper case 3, which are spaced apart in the left-right direction and extend continuously in the front-rear direction, and two pairs of case partition walls 11a1, 11a2 and 11b1, 11b2 are formed in parallel between the main circuit case walls 10a, 10b and spaced apart from each other in the front-rear direction. An auxiliary circuit case wall 11c is formed in parallel on the outside of the main circuit case wall 10a. The power supply side terminal parts 4a1 to 4c1 of the main circuit and the load side terminal parts 4a2 to 4c2 of the main circuit are arranged between the pair of main circuit case walls 10a, 10b and the case partition walls 11a1, 11a1 and 11b1, 11b2, and the auxiliary power supply side terminal part 4d1 and the auxiliary load side terminal part 4d2 are arranged between the main circuit case wall 10a and the auxiliary circuit case wall 11c.
The contact portion 6 is disposed in the central portion surrounded by a pair of main circuit case walls 10a, 10b and case partitions 11a, 11b of the upper case 3, and an arc-extinguishing cover 7 is attached to the upper case 3, thereby providing a sealed arc-extinguishing chamber 12 as shown in Figure 4.

接点部６は、図４に示すように、主回路の電源側端子部４ａ１～４ｃ１の固定接点１３ａ（図４では主回路の電源側端子部４ｂ１の固定接点１３ａのみを示す）と、主回路の負荷側端子部４ａ２～４ｃ２の固定接点１３ｂ（図４では、負荷側端子部４ｂ２の固定接点１３ｂのみを示す）と、接点支え１４に支持されて固定接点１３ａ，１３ｂに可動接点１５ａ，１５ｂが接離する可動接触子１５と、を備えている。そして、接点支え１４に、電磁石を構成する可動鉄心１６が連結しており、電磁石を構成する励磁コイル（不図示）が励磁状態になると、可動鉄心１６とともに接点支え１４が図４の下方に移動して可動接点１５ａ，１５ｂが固定接点１３ａ、１３ｂに接触した閉極状態となる。As shown in Fig. 4, the contact section 6 includes fixed contacts 13a of the power supply side terminals 4a1 to 4c1 of the main circuit (only the fixed contact 13a of the power supply side terminal 4b1 of the main circuit is shown in Fig. 4), fixed contacts 13b of the load side terminals 4a2 to 4c2 of the main circuit (only the fixed contact 13b of the load side terminal 4b2 is shown in Fig. 4), and a movable contactor 15 supported by a contact support 14 and movable contacts 15a and 15b that are connected to and separated from the fixed contacts 13a and 13b. A movable iron core 16 that constitutes an electromagnet is connected to the contact support 14, and when an excitation coil (not shown) that constitutes the electromagnet is excited, the contact support 14 moves downward in Fig. 4 together with the movable iron core 16, and the movable contacts 15a and 15b come into contact with the fixed contacts 13a and 13b, resulting in a closed state.

消弧カバー７は、図３に示すように、板形状のカバー本体２０と、このカバー本体２０の前後方向の縁部から互いに対向して形成されている第1カバー壁部２１及び第２カバー壁部２２と、を備えている。ここで、図５は、図３に示した上ケース３に装着する前の消弧カバー７を前方から見た図を示し、図６は、図３に示した消弧カバー７を後方から見た図を示している。As shown in Fig. 3, the arc-extinguishing cover 7 comprises a plate-shaped cover body 20, and a first cover wall portion 21 and a second cover wall portion 22 formed opposite each other from the front-rear edges of the cover body 20. Here, Fig. 5 shows a front view of the arc-extinguishing cover 7 before it is attached to the upper case 3 shown in Fig. 3, and Fig. 6 shows a rear view of the arc-extinguishing cover 7 shown in Fig. 3.

第１カバー壁部２１は、図５に示すように、互いに左右方向に離れて補助側仕切り壁２３及び電源側仕切り壁２４ａ～２４ｃが形成され、電源側仕切り壁２４ａ～２４ｃの左右方向の両縁部に、電源側仕切り壁２４ａ～２４ｃの外面より内側の位置から左右方向の外方に突出して上下方向に延在するカバー側係合部２５ａ～２５ｆが形成されている。カバー側係合部２５ａ～２５ｆの各々のカバー本体２０から離間している下方位置に、第２フック部２６が形成されている。そして、電源側仕切り壁２４ａの左側縁部に形成されているカバー側係合部２５ｂには、第２フック部２６よりカバー本体２０に近い上方位置に、第１フック部２７が形成されている。また、電源側仕切り壁２４ｃの右側縁部に形成されているカバー側係合部２５ｅにも、第２フック部２６よりカバー本体２０に近い上方位置に、第１フック部２７が形成されている。 As shown in FIG. 5, the first cover wall portion 21 has the auxiliary side partition wall 23 and the power supply side partition walls 24a to 24c formed at left and right distances from each other, and the cover side engagement parts 25a to 25f are formed on both left and right edges of the power supply side partition walls 24a to 24c, protruding outward in the left and right directions from a position inside the outer surface of the power supply side partition walls 24a to 24c and extending in the up and down direction. A second hook part 26 is formed at a lower position away from the cover main body 20 of each of the cover side engagement parts 25a to 25f. A first hook part 27 is formed at an upper position closer to the cover main body 20 than the second hook part 26 on the cover side engagement part 25b formed on the left edge of the power supply side partition wall 24a. A first hook part 27 is also formed at an upper position closer to the cover main body 20 than the second hook part 26 on the cover side engagement part 25e formed on the right edge of the power supply side partition wall 24c.

また、第２カバー壁部２２は、図６に示すように、互いに左右方向に離れて補助側仕切り壁２８及び負荷側仕切り壁２９ａ～２９ｃが形成され、負荷側仕切り壁２９ａ～２９ｃの左右方向の両縁部に、負荷側仕切り壁２９ａ～２９ｃの外面より内側の位置から左右方向の外方に突出して上下方向に延在するカバー側係合部３０ａ～３０ｆが形成されている。カバー側係合部３０ａ～３０ｆの各々のカバー本体２０から離間している下方位置には、第２フック部３１が形成されている。そして、負荷側仕切り壁２９ａの左側縁部に形成されているカバー側係合部３０ｂには、第２フック部３１よりカバー本体２０に近い上方位置に、第１フック部３２が形成されている。また、負荷側仕切り壁２９ｃの右側縁部に形成されているカバー側係合部３０ｅにも、第２フック部３１よりカバー本体２０に近い上方位置に、第１フック部３２が形成されている。 As shown in FIG. 6, the second cover wall 22 has an auxiliary side partition wall 28 and load side partition walls 29a-29c spaced apart from each other in the left-right direction, and cover side engagement parts 30a-30f are formed on both left-right edges of the load side partition walls 29a-29c, protruding outward in the left-right direction from a position inside the outer surface of the load side partition walls 29a-29c and extending in the up-down direction. A second hook part 31 is formed at a lower position away from the cover main body 20 of each of the cover side engagement parts 30a-30f. A first hook part 32 is formed at an upper position closer to the cover main body 20 than the second hook part 31 on the cover side engagement part 30b formed on the left edge of the load side partition wall 29a. A first hook part 32 is also formed at an upper position closer to the cover main body 20 than the second hook part 31 on the cover side engagement part 30e formed on the right edge of the load side partition wall 29c.

一方、図７に示すように、上ケース３の一対の主回路用ケース壁１０ａ，１０ｂ及びケース隔壁１１ａ１，１１ａ２の内側（接点部６に近い側）に、カバー側係合部３３ａ～３３ｄが形成されている。カバー側係合部３３ａは主回路用ケース壁１０ａの一部から連続して左右方向に延在する板状部位であり、カバー側係合部３３ｄも、主回路用ケース壁１０ｂの一部から連続して左右方向に延在する板状部位である。カバー側係合部３３ｂ，３３ｃは、ケース隔壁１１ａ１，１１ａ２の一部から連続して左右方向に延在するＣ字形状部材である。これらカバー側係合部３３ａ～３３ｄに対して後方に離間した位置に、係合安定板３４ａ～３４ｆが平行に形成されている。On the other hand, as shown in Fig. 7, cover side engagement parts 33a to 33d are formed on the inside (the side closer to the contact part 6) of the pair of main circuit case walls 10a, 10b and case partition walls 11a1, 11a2 of the upper case 3. The cover side engagement part 33a is a plate-shaped part extending in the left-right direction from a part of the main circuit case wall 10a, and the cover side engagement part 33d is also a plate-shaped part extending in the left-right direction from a part of the main circuit case wall 10b. The cover side engagement parts 33b, 33c are C-shaped members extending in the left-right direction from a part of the case partition walls 11a1, 11a2. Engagement stabilization plates 34a to 34f are formed in parallel at a position spaced rearward from these cover side engagement parts 33a to 33d.

そして、図８に示すように、カバー側係合部３３ａ～３３ｄの最も下方向を向く面が、前述した消弧カバー７の第１カバー壁部２１のカバー側係合部２５ａ～２５ｆの各々に設けた第２フック部２６に係合する第２フック係合部３５とされている。また、カバー側係合部３３ｂ，３３ｃのＣ字形状切り欠き部の下方向を向く面が、第１カバー壁部２１のカバー側係合部２５ｂ、２５ｅに設けた第１フック部２７に係合する第１フック係合部３６とされている。8, the surfaces facing most downward of the cover side engagement parts 33a to 33d are second hook engagement parts 35 that engage with the second hook parts 26 provided on the cover side engagement parts 25a to 25f of the first cover wall part 21 of the above-mentioned arc-extinguishing cover 7. The surfaces facing downward of the C-shaped cutout parts of the cover side engagement parts 33b, 33c are first hook engagement parts 36 that engage with the first hook parts 27 provided on the cover side engagement parts 25b, 25e of the first cover wall part 21.

また、図示しないが、上ケース３の一対の主回路用ケース壁１０ａ，１０ｂ及びケース隔壁１１ｂ１，１１ｂ２の内側（接点部６に近い側）にも、同一形状のカバー側係合部３３ａ～３３ｄが形成されている。また、カバー側係合部３３ａ～３３ｄには、消弧カバー７の第２カバー壁部２２のカバー側係合部３０ａ～３０ｆの各々に設けた第２フック部３１に係合する第２フック係合部３５が形成されている。また、第２カバー壁部２２のカバー側係合部３０ｂ、３０ｅに設けた第１フック部３２に係合する第１フック係合部３６が形成されている。そして、カバー側係合部３３ａ～３３ｄに対して前方に離間した位置に、係合安定板３４ａ～３４ｆが平行に形成されている。Although not shown, cover side engagement parts 33a to 33d of the same shape are also formed on the inside (side closer to the contact part 6) of the pair of main circuit case walls 10a, 10b and case partition walls 11b1, 11b2 of the upper case 3. Second hook engagement parts 35 that engage with second hook parts 31 provided on each of the cover side engagement parts 30a to 30f of the second cover wall part 22 of the arc-extinguishing cover 7 are also formed on the cover side engagement parts 33a to 33d. First hook engagement parts 36 that engage with first hook parts 32 provided on the cover side engagement parts 30b, 30e of the second cover wall part 22 are also formed. Engagement stabilization plates 34a to 34f are formed in parallel at a position spaced forward from the cover side engagement parts 33a to 33d.

次に、図９は、図２のX－X線矢視要部断面図であり、消弧カバー７を上ケース３に装着した電磁接触器１を示す図である。なお、図９における上下方向を、消弧カバー７の装着方向と称する。
図９に示すように、上ケース３の前側及び後側に設けている第２フック係合部３５及び第１フック係合部３６は、消弧カバー７の装着方向に対して直交する係合面として形成されている。 9 is a cross-sectional view of the main part taken along line XX in FIG. 2, showing the electromagnetic contactor 1 with the arc-extinguishing cover 7 attached to the upper case 3. The up-down direction in FIG. 9 is referred to as the attachment direction of the arc-extinguishing cover 7.
As shown in FIG. 9 , the second hook engaging portion 35 and the first hook engaging portion 36 provided on the front and rear sides of the upper case 3 are formed as engaging surfaces perpendicular to the mounting direction of the arc-extinguishing cover 7 .

図９では、前側に配置した第１カバー壁部２１のカバー側係合部２５ｂ、後側に配置した第２カバー壁部２２のカバー側係合部３０ｂが消弧カバー７の装着方向に沿って配置されているが、第１カバー壁部２１のカバー側係合部２５ａ、２５ｃ～２５ｆ、第２カバー壁部２２のカバー側係合部３０ａ、３０ｃ～３０も消弧カバー７の装着方向に沿って配置されている。そして、第１カバー壁部２１のカバー側係合部２５ａ～２５ｆに設けた第２フック部２６と、第２カバー壁部２２のカバー側係合部３０ａ～３０ｆに設けた第２フック部３１の上面には、消弧カバー７の装着方向に対して直交するフック係合面２６ａ、３１ａが形成されている。9, the cover side engagement portion 25b of the first cover wall portion 21 arranged on the front side and the cover side engagement portion 30b of the second cover wall portion 22 arranged on the rear side are arranged along the mounting direction of the arc-extinguishing cover 7, but the cover side engagement portions 25a, 25c to 25f of the first cover wall portion 21 and the cover side engagement portions 30a, 30c to 30f of the second cover wall portion 22 are also arranged along the mounting direction of the arc-extinguishing cover 7. Hook engagement surfaces 26a, 31a perpendicular to the mounting direction of the arc-extinguishing cover 7 are formed on the upper surfaces of the second hook portion 26 provided on the cover side engagement portions 25a to 25f of the first cover wall portion 21 and the second hook portion 31 provided on the cover side engagement portions 30a to 30f of the second cover wall portion 22.

また、第１カバー壁部２１のカバー側係合部２５ｂに設けた第１フック部２７と、カバー側係合部２５ｅに設けた第１フック部２７（図５参照）と、第２カバー壁部２２のカバー側係合部３０ｂに設けた第１フック部３２と、カバー側係合部３０ｅに設けた第１フック部３２（図６参照）は、断面三角形状に突出して形成されている。
そして、第１カバー壁部２１の第１フック部２７が上ケース３の前側の第１フック係合部３６に係合し、第２カバー壁部２２の第１フック部３２が上ケース３の後側の第１フック係合部３６に係合する。 In addition, the first hook portion 27 provided on the cover side engagement portion 25b of the first cover wall portion 21, the first hook portion 27 provided on the cover side engagement portion 25e (see Figure 5), the first hook portion 32 provided on the cover side engagement portion 30b of the second cover wall portion 22, and the first hook portion 32 provided on the cover side engagement portion 30e (see Figure 6) are formed to protrude in a triangular cross-section.
Then, the first hook portion 27 of the first cover wall portion 21 engages with the first hook engagement portion 36 on the front side of the upper case 3, and the first hook portion 32 of the second cover wall portion 22 engages with the first hook engagement portion 36 on the rear side of the upper case 3.

そして、上ケース３に装着した消弧カバー７は、第１カバー壁部２１の補助側仕切り壁２３及び電源側仕切り壁２４ａ～２４ｃが、補助電源側端子部４ｄ１及び電源側端子部４ａ１～４ｃ１と接点部６の間を仕切り、第２カバー壁部２２の補助側仕切り壁２９及び負荷側仕切り壁２９ａ～２９ｃが、補助負荷側端子部４ｄ２及び負荷側端子部４ａ２～４ｃ２と接点部６の間を仕切り、カバー本体２０が接点部６の上部を覆うことで消弧室１２を密閉する。また、図７で示したように、上ケース３に係合安定板３４ａ～３４ｆが形成されているが、これら係合安定板３４ａ～３４ｆは、第１カバー壁部２１のカバー側係合部２５ａ～２５ｆの後側近傍に沿って配置され、第２カバー壁部２２のカバー側係合部３０ａ～３０ｆの前側近傍にも沿って配置される。 In the arc-extinguishing cover 7 attached to the upper case 3, the auxiliary side partition wall 23 and the power side partition walls 24a-24c of the first cover wall 21 partition the auxiliary power side terminal 4d1 and the power side terminal 4a1-4c1 from the contact 6, the auxiliary side partition wall 29 and the load side partition walls 29a-29c of the second cover wall 22 partition the auxiliary load side terminal 4d2 and the load side terminal 4a2-4c2 from the contact 6, and the cover body 20 covers the upper part of the contact 6 to seal the arc-extinguishing chamber 12. Also, as shown in FIG. 7, the engagement stabilizing plates 34a-34f are formed on the upper case 3, and these engagement stabilizing plates 34a-34f are arranged along the rear side vicinity of the cover side engagement parts 25a-25f of the first cover wall 21 and along the front side vicinity of the cover side engagement parts 30a-30f of the second cover wall 22.

そして、電磁接触器１は、短絡事故などで接点部６に異常な大電流が流れ、発生したアークガスにより消弧室１２の内圧が過大に上昇することで、消弧カバー７が上ケース３から離脱して浮き上がろうとする。
ここで、消弧室１２の内圧が過大に上昇すると、第１カバー壁部２１のカバー側係合部２５ｂ、２５ｅが後側に弾性変形し、第２カバー壁部２２のカバー側係合部３０ｂ、３０ｅが前側に弾性変形することで、上ケース３の前側の第１フック係合部３６と第１フック部２７との係合状態が外れ、上ケース３の後側の第１フック係合部３６と第１フック部３２との係合状態が外れる。 When an abnormally large current flows through the contact portion 6 of the electromagnetic contactor 1 due to a short circuit or the like, the internal pressure of the arc extinguishing chamber 12 rises excessively due to the generated arc gas, causing the arc extinguishing cover 7 to detach from the upper case 3 and tend to float up.
Here, when the internal pressure of the arc extinguishing chamber 12 increases excessively, the cover side engagement portions 25b, 25e of the first cover wall portion 21 elastically deform toward the rear, and the cover side engagement portions 30b, 30e of the second cover wall portion 22 elastically deform toward the front, causing the engagement between the first hook engagement portion 36 on the front side of the upper case 3 and the first hook portion 27 to be released, and the engagement between the first hook engagement portion 36 on the rear side of the upper case 3 and the first hook portion 32 to be released.

そして、上ケース３に対して消弧カバー７が浮き上がることで、図１０に示すように、第１カバー壁部２１の６箇所の第２フック部２６のフック係合面２６ａが、上ケース３の６箇所の前側の第２フック係合部３５に当接し、第２カバー壁部２２の６箇所の第２フック部３１のフック係合面３１ａが、上ケース３の６箇所の後側の第２フック係合部３５に当接し、第２フック部２６，３１及び第２フック係合部３５の係合が維持される。これにより、消弧カバー７のカバー本体２０と上ケース３の上部との間に隙間が形成され、この隙間がガス抜き穴となって消弧室１２内のアークガスが外部に放出され、消弧室１２の内圧が減少して消弧カバー７の吹き飛びが防止される。 Then, as the arc-extinguishing cover 7 is lifted up relative to the upper case 3, as shown in Fig. 10, the hook engagement surfaces 26a of the six second hook portions 26 of the first cover wall portion 21 come into contact with the six front second hook engagement portions 35 of the upper case 3, and the hook engagement surfaces 31a of the six second hook portions 31 of the second cover wall portion 22 come into contact with the six rear second hook engagement portions 35 of the upper case 3, maintaining the engagement of the second hook portions 26, 31 and the second hook engagement portions 35. As a result, a gap is formed between the cover body 20 of the arc-extinguishing cover 7 and the upper part of the upper case 3, and this gap serves as a gas vent hole to release the arc gas in the arc-extinguishing chamber 12 to the outside, reducing the internal pressure of the arc-extinguishing chamber 12 and preventing the arc-extinguishing cover 7 from being blown off.

ここで、上ケース３の第１フック係合部３６に消弧カバー７の第１フック部２７，３２が係合し、消弧カバー７が消弧室１２を密閉して上ケース３に装着されている状態を、第１係合状態と称する。また、上ケース３の第２フック係合部３５に消弧カバー７の第２フック部２６，３１が係合し、上ケース３と消弧カバー７の間に隙間を設けた状態で消弧カバー７が上ケース３に装着されている状態を、第２係合状態と称する。Here, the state in which the first hook portions 27, 32 of the arc-extinguishing cover 7 engage with the first hook engagement portion 36 of the upper case 3, and the arc-extinguishing cover 7 is attached to the upper case 3 while sealing the arc-extinguishing chamber 12, is referred to as the first engagement state. Also, the state in which the second hook portions 26, 31 of the arc-extinguishing cover 7 engage with the second hook engagement portion 35 of the upper case 3, and the arc-extinguishing cover 7 is attached to the upper case 3 with a gap between the upper case 3 and the arc-extinguishing cover 7, is referred to as the second engagement state.

次に、本実施形態の電磁接触器１の作用効果について説明する。
本実施形態は、消弧カバー７が消弧室１２を密閉して上ケース３に装着されている第１係合状態では、上ケース３に設けた第１フック係合部３６に消弧カバー７に設けた第１フック部２７，３２が係合している。そして、アークガスにより消弧室１２の内圧が過大に上昇した際には、係合力が弱い第１フック係合部３６及び第１フック部２７，３２の係合が外れ、上ケース３に設けた第２フック係合部３５と消弧カバー７に設けた第２フック部２６，３１とが強い係合力で係合し、消弧カバー７と上ケース３の間に隙間を設けた第２係合状態とするので、消弧室１２内のアークガスを外部に放出し、上ケース３から消弧カバー７が吹き飛ぶのを確実に防止することができる。 Next, the effects of the electromagnetic contactor 1 of this embodiment will be described.
In this embodiment, in a first engagement state in which the arc-extinguishing cover 7 is attached to the upper case 3 while sealing the arc-extinguishing chamber 12, the first hook portions 27, 32 provided on the arc-extinguishing cover 7 are engaged with the first hook engagement portion 36 provided on the upper case 3. When the internal pressure of the arc-extinguishing chamber 12 excessively increases due to arc gas, the engagement between the first hook engagement portion 36 and the first hook portions 27, 32, which has a weak engagement force, is released, and the second hook engagement portion 35 provided on the upper case 3 and the second hook portions 26, 31 provided on the arc-extinguishing cover 7 are engaged with a strong engagement force, thereby establishing a second engagement state in which a gap is provided between the arc-extinguishing cover 7 and the upper case 3. This allows the arc gas in the arc-extinguishing chamber 12 to be released to the outside, and reliably prevents the arc-extinguishing cover 7 from being blown off from the upper case 3.

また、第１係合状態では、上ケース３の第１フック係合部３６と消弧カバー７の第１フック部２７，３２とが係合し、第２係合状態では、上ケース３の第２フック係合部３５と消弧カバー７の第２フック部２６，３１とが係合し、第１係合状態と第２係合状態では、消弧カバー７異なる部位が係合している。このため、従来技術のような課題、消弧カバー７、或いは上ケース３に、第１係合状態及び第２係合状態において同一の係合部を使用することで、第１係合状態から第２係合状態に移行する際に係合部が損傷し、第２係合状態を保持できない、という課題が発生しない。したがって、例えば消弧室１２の内圧の急上昇により第１係合状態の係合部（第１フック係合部３６、第１フック部２７，３２）の一部が損傷しても、第２係合状態の係合力が低下することがない。In addition, in the first engagement state, the first hook engagement portion 36 of the upper case 3 and the first hook portions 27, 32 of the arc-extinguishing cover 7 are engaged, and in the second engagement state, the second hook engagement portion 35 of the upper case 3 and the second hook portions 26, 31 of the arc-extinguishing cover 7 are engaged, and different portions of the arc-extinguishing cover 7 are engaged in the first engagement state and the second engagement state. Therefore, the problem of the conventional technology, that is, the engagement portion is damaged when transitioning from the first engagement state to the second engagement state by using the same engagement portion for the arc-extinguishing cover 7 or the upper case 3 in the first engagement state and the second engagement state, and the second engagement state cannot be maintained, does not occur. Therefore, for example, even if a part of the engagement portion (first hook engagement portion 36, first hook portions 27, 32) in the first engagement state is damaged due to a sudden rise in the internal pressure of the arc-extinguishing chamber 12, the engagement force in the second engagement state does not decrease.

また、第１係合状態から第２係合状態に移行する際に、消弧カバー７の第１カバー壁部２１に形成したカバー側係合部２５ａ～２５ｆが後側に大きく変位し、第２カバー壁部２２に形成したカバー側係合部３０ａ～３０ｆが後側に大きく変位しようとすると、上ケース３に設けた係合安定板３４ａ～３４ｆが、カバー側係合部２５ａ～２５ｆ、３０ａ～３０ｆに接触することで大きな変位を規制する。このため、第１係合状態から第２係合状態に移行する際の第２フック係合部３５及び第２フック部２６，３１の係合を常に安定して行うことができる。 In addition, when transitioning from the first engagement state to the second engagement state, if the cover side engagement portions 25a-25f formed on the first cover wall portion 21 of the arc-extinguishing cover 7 are displaced significantly rearward and the cover side engagement portions 30a-30f formed on the second cover wall portion 22 attempt to be displaced significantly rearward, the engagement stabilizing plates 34a-34f provided on the upper case 3 come into contact with the cover side engagement portions 25a-25f, 30a-30f to restrict the large displacement. Therefore, the engagement of the second hook engagement portion 35 and the second hook portions 26, 31 can always be performed stably when transitioning from the first engagement state to the second engagement state.

１ 電磁接触器１
２ 下ケース
３ 上ケース（ケース）
４ａ１，４ｂ１，４ｃ１ 主回路の電源側端子部
４ａ２，４ｂ２，４ｃ２ 主回路の負荷側端子部
４ｄ１ 補助電源側端子部
４ｄ２ 補助負荷側端子部
４ｅ コイル端子
６ 接点部
７ 消弧カバー
８ 端子カバー
１０ａ，１０ｂ 主回路用ケース壁
１１ａ１，１１ａ２，１１ｂ１，１１ｂ２ ケース隔壁
１１ｃ 補助回路用ケース壁
１２ 消弧室
１３ａ 固定接点
１３ｂ 固定接点
１４ 接点支え
１５ 可動接触子
１５ａ，１５ｂ 可動接点
１６ 可動鉄心
２０ カバー本体
２１ 第1カバー壁部
２２ 第２カバー壁部
２３ 補助側仕切り壁
２４ａ，２４ｂ，２４ｃ 電源側仕切り壁
２５ａ～２５ｆ カバー側係合部
２６ 第２フック部（第２係合部）
２６ａ フック係合面（第２係合面）
２７ 第１フック部（第１係合部）
２８ 補助側仕切り壁
２９ａ，２９ｂ，２９ｃ 負荷側仕切り壁
３０ａ～３０ｆ カバー側係合部
３１ 第２フック部（第２係合部）
３１ａ フック係合面（第２係合面）
３２ 第１フック部（第１係合部）
３３ａ～３３ｄ カバー側係合部
３４ａ～３４ｆ 係合安定板（係合安定部）
３５ 第２フック係合部（第４係合部）
３６ 第１フック係合部（第３係合部） 1 Electromagnetic contactor 1
2 Lower case 3 Upper case (case)
Description of the Preferred Embodiment 4a1, 4b1, 4c1 Power supply side terminal portion 4a2, 4b2, 4c2 of main circuit Load side terminal portion 4d1 Auxiliary power supply side terminal portion 4d2 Auxiliary load side terminal portion 4e Coil terminal 6 Contact portion 7 Arc-extinguishing cover 8 Terminal cover 10a, 10b Main circuit case wall 11a1, 11a2, 11b1, 11b2 Case partition wall 11c Auxiliary circuit case wall 12 Arc-extinguishing chamber 13a Fixed contact 13b Fixed contact 14 Contact support 15 Movable contactor 15a, 15b Movable contact 16 Movable core 20 Cover main body 21 First cover wall portion 22 Second cover wall portion 23 Auxiliary side partition wall 24a, 24b, 24c Power supply side partition walls 25a to 25f Cover side engagement portion 26 Second hook portion (second engagement portion)
26a hook engagement surface (second engagement surface)
27 First hook portion (first engagement portion)
28 Auxiliary side partition walls 29a, 29b, 29c Load side partition walls 30a to 30f Cover side engagement portion 31 Second hook portion (second engagement portion)
31a hook engagement surface (second engagement surface)
32 First hook portion (first engagement portion)
33a to 33d: Cover side engagement parts 34a to 34f: Engagement stabilizing plates (engagement stabilizing parts)
35 Second hook engagement portion (fourth engagement portion)
36 First hook engagement portion (third engagement portion)

Claims (5)

可動接点と固定接点とを有する接点部を消弧室に収納したケースと、前記消弧室を覆って前記ケースに装着される消弧カバーと、を備えた電磁接触器において、
前記消弧カバーは、前記ケースに対する装着方向に離間して第１係合部及び第２係合部が形成され、
前記ケースは、第３係合部及び第４係合部が形成されており、
前記第１係合部及び前記第３係合部が係合した第１係合状態で、前記消弧カバーが前記消弧室を密閉して前記ケースに装着され、
前記第２係合部及び前記第４係合部が係合した第２係合状態で、前記消弧カバーと前記ケースの間に隙間を設けた状態で前記ケースに前記消弧カバーが保持されることを特徴とする電磁接触器。 An electromagnetic contactor including a case in which a contact portion having a movable contact and a fixed contact is housed in an arc-extinguishing chamber, and an arc-extinguishing cover attached to the case to cover the arc-extinguishing chamber,
The arc-extinguishing cover has a first engagement portion and a second engagement portion spaced apart from each other in a mounting direction of the case,
The case includes a third engagement portion and a fourth engagement portion.
In a first engagement state in which the first engagement portion and the third engagement portion are engaged with each other, the arc-extinguishing cover is attached to the case while sealing the arc-extinguishing chamber,
An electromagnetic contactor characterized in that, in a second engagement state in which the second engagement portion and the fourth engagement portion are engaged, the arc-extinguishing cover is held on the case with a gap provided between the arc-extinguishing cover and the case. 前記第１係合状態は前記第２係合状態よりも係合部同士の係合力が弱いことを特徴とする請求項１記載の電磁接触器。An electromagnetic contactor as described in claim 1, characterized in that the engagement force between the engagement portions is weaker in the first engagement state than in the second engagement state. 前記消弧カバーは、板状のカバー本体と、前記カバー本体から互いに対向して前記装着方向に延在する少なくとも一対のカバー壁部とを備え、
前記一対のカバー壁部の前記カバー本体から離間した位置に前記第２係合部が形成され、前記一対のカバー壁部の前記カバー本体に近接する位置に前記第１係合部が形成されていることを特徴とする請求項１又は２記載の電磁接触器。 The arc-extinguishing cover includes a plate-shaped cover body and at least a pair of cover wall portions extending from the cover body in the mounting direction and facing each other,
3. The electromagnetic contactor according to claim 1, wherein the second engagement portion is formed at a position spaced apart from the cover body of the pair of cover walls, and the first engagement portion is formed at a position close to the cover body of the pair of cover walls. 前記ケースの前記第３係合部及び前記第４係合部は、前記消弧カバーの装着方向に直交する係合面を有し、
前記消弧カバーの前記第１係合部は、前記ケースの前記第３係合部の前記係合面に対して摺動する斜面を有し、
前記消弧カバーの前記第２係合部は、前記装着方向に直交して前記第４係合部の前記係合面に当接する第２係合面を有していることを特徴とする請求項１又は２記載の電磁接触器。 The third engagement portion and the fourth engagement portion of the case have engagement surfaces perpendicular to a mounting direction of the arc-extinguishing cover,
the first engagement portion of the arc-extinguishing cover has an inclined surface that slides against the engagement surface of the third engagement portion of the case,
3. The electromagnetic contactor according to claim 1, wherein the second engagement portion of the arc-extinguishing cover has a second engagement surface that is perpendicular to the mounting direction and abuts against the engagement surface of the fourth engagement portion. 前記第１係合状態から前記第２係合状態に移行する際に、前記消弧カバーに形成されている前記第２係合部の過度の変形を抑制して前記第２係合状態を安定させる係合安定部を前記ケースに設けていることを特徴とする請求項１又は２記載の電磁接触器。An electromagnetic contactor as described in claim 1 or 2, characterized in that the case is provided with an engagement stabilization portion that suppresses excessive deformation of the second engagement portion formed on the arc-extinguishing cover when transitioning from the first engagement state to the second engagement state, thereby stabilizing the second engagement state.
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CN203573915U (en) 2013-10-30 2014-04-30 三菱电机株式会社 Installation structure of cover member of electromagnetic contactor and cover member of electromagnetic contractor
CN204348624U (en) 2015-01-12 2015-05-20 厦门宏发开关设备有限公司 A kind of contactor cover
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JP4848887B2 (en) * 2006-08-16 2011-12-28 富士電機機器制御株式会社 Magnetic contactor
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CN203573915U (en) 2013-10-30 2014-04-30 三菱电机株式会社 Installation structure of cover member of electromagnetic contactor and cover member of electromagnetic contractor
CN204348624U (en) 2015-01-12 2015-05-20 厦门宏发开关设备有限公司 A kind of contactor cover
WO2021181927A1 (en) 2020-03-12 2021-09-16 富士電機機器制御株式会社 Electromagnetic contactor

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