WO2014083769A1 - Contact device and electromagnetic switch using same - Google Patents

Contact device and electromagnetic switch using same Download PDF

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Publication number
WO2014083769A1
WO2014083769A1 PCT/JP2013/006441 JP2013006441W WO2014083769A1 WO 2014083769 A1 WO2014083769 A1 WO 2014083769A1 JP 2013006441 W JP2013006441 W JP 2013006441W WO 2014083769 A1 WO2014083769 A1 WO 2014083769A1
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WIPO (PCT)
Prior art keywords
contact
arc
movable
pair
movable contact
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PCT/JP2013/006441
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French (fr)
Japanese (ja)
Inventor
鹿志村　修
磯崎　優
幸悦 高谷
中　康弘
雄二 柴
Original Assignee
富士電機機器制御株式会社
富士電機株式会社
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Application filed by 富士電機機器制御株式会社, 富士電機株式会社 filed Critical 富士電機機器制御株式会社
Publication of WO2014083769A1 publication Critical patent/WO2014083769A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/546—Contact arrangements for contactors having bridging contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/36—Stationary parts of magnetic circuit, e.g. yoke
    • H01H50/38—Part of main magnetic circuit shaped to suppress arcing between the contacts of the relay

Definitions

  • the present invention uses a contact device in which a pair of fixed contacts arranged at a predetermined interval and a movable contact arranged so as to be able to come in contact with and away from the fixed contacts are arranged in a contact housing case, and the same is used. It relates to an electromagnetic switch.
  • an electromagnetic switch such as an electromagnetic relay or an electromagnetic contactor
  • the current is cut off from a closed state of a contact mechanism in which a stationary contact and a movable contact are in contact with each other.
  • Various contact mechanisms have been proposed that extinguish arcs that are generated at the time of opening to move the movable contact away from the fixed contact in order to achieve a state.
  • a fixed contact support case that supports a first fixed contact and a second fixed contact that are spaced apart by a predetermined distance, and the first fixed contact in the fixed contact support case.
  • a movable contact disposed so as to be able to contact with and separate from the contact and the second fixed contact, and a parallel magnetic pole surface disposed in parallel with the movable contact in the direction perpendicular to the longitudinal direction of the movable contact.
  • Electromagnetic contact provided with a pair of arc extinguishing magnet bodies having the same polarity, and a drive mechanism for driving the movable contact so as to be able to contact with and separate from the first fixed contact and the second fixed contact A device has been proposed (see, for example, Patent Document 1).
  • the fixed contact support housing is a vertical surface in which the inner wall surrounding at least the first fixed contact and the contact portion between the second fixed contact and the movable contact is opposed to the longitudinal end of the movable contact.
  • the front and rear vertical surfaces extending along the longitudinal direction of the movable contact from the front and rear end portions of the vertical surface are formed in a rectangular tube inner surface shape.
  • a substantially sealed space that becomes an arc extinguishing space is formed on the inner peripheral surface of the stationary contact support housing, and in this arc extinguishing space, An arc generated at the time of opening when the contact of the movable contact is separated from the contact of the pair of fixed contacts is extinguished.
  • the distance between the movable contact and the inner peripheral surface of the fixed contact support housing in plan view is such that the end of the movable contact is a square or a circular shape, but the inner periphery of the fixed contact support housing.
  • the surface is formed in a rectangular tube shape.
  • casing is not constant. Then, the arc flying direction changes depending on the current value flowing from the power source side to the load side when the movable contact contacts the pair of fixed contacts, so that the arc extension distance changes depending on the arc flying direction. There is an unsolved problem that the arc is unstable. Furthermore, since the arc does not hit the wall surface of the stationary contact support case perpendicularly, the arc that reaches the wall surface does not stay on the wall surface that reaches the wall surface, and the arc shape is partially interrupted and repeats the arc again. There is also an unsolved problem that the arc interruption performance is reduced.
  • An object is to provide a contact device and an electromagnetic switch using the contact device.
  • a first aspect of the contact device is a pair of fixed contacts fixedly arranged at a predetermined interval, and can be contacted and separated with respect to the pair of fixed contacts.
  • a contact storage case for storing the arranged movable contact is provided.
  • An end surface of the movable contact facing the pair of fixed contacts is formed in an arcuate end surface centered on the contact portion, and an inner wall facing the arcuate end surface of the movable contact of the contact storage case is It is formed on a semi-cylindrical surface centered on the contact portion of the movable contact.
  • the diameter of the arcuate end surface of the movable contact is set equal to the width of the movable contact, and the planar view shape of the movable contact is an oval. Is formed.
  • the diameter of the semi-cylindrical surface of the contact storage case is set equal to the width between the inner walls of the contact storage case, and the inner wall of the contact storage case has a shape in plan view. Is formed in an oval shape.
  • the outer peripheral surface of the contact storage case is formed in a rectangular parallelepiped shape, and arc-extinguishing permanent magnets facing each other are arranged on at least a pair of outer peripheral surfaces facing each other. ing.
  • the outer peripheral surface of the contact storage case is formed in a rectangular parallelepiped shape, and two pairs of outer peripheral surfaces facing each other are arranged with arc-extinguishing permanent magnets facing each other. Has been.
  • the opposing surfaces of the arc extinguishing magnets facing each other have different polarities.
  • the opposing surfaces of the arc extinguishing permanent magnets facing each other have the same polarity.
  • the opposing surfaces of the arc extinguishing permanent magnets facing each other have the same polarity, and the polarities of the opposing surfaces of one pair of arc extinguishing permanent magnets are the same. The polarity of the opposing surface of the other pair of arc erasing permanent magnets is different.
  • a first aspect of the electromagnetic switch according to the present invention includes the contact device according to the first to seventh aspects, wherein the movable contact is connected to a movable iron core of an electromagnet device, and the pair of pairs The stationary contact is connected to the external connection terminal.
  • the distance from the contact position between the movable contact and the pair of fixed contacts to the inner wall surface of the contact storage case surrounding them is set to be substantially equal in the radial direction. Even if the direction of the arc generated at the time of opening away from the fixed contact is changed, the arc extension length becomes equal, and a uniform arc extinguishing function can be exhibited, preventing the arc from recurring and being stable. The arc can be extinguished.
  • an electromagnetic contactor and an electromagnetic relay that can improve the breaking performance by surely extinguishing an arc generated at the time of opening with a simple configuration
  • An electromagnetic switch such as can be provided.
  • FIG. 1 is a cross-sectional view showing a first embodiment when the contact device according to the present invention is applied to an electromagnetic contactor.
  • reference numeral 10 denotes an electromagnetic contactor.
  • the electromagnetic contactor 10 includes a contact device 100 provided with a contact mechanism and an electromagnet unit 200 that drives the contact device 100.
  • the contact device 100 includes a contact storage case 102 as an arc extinguishing chamber that stores the contact mechanism 101.
  • the contact housing case 102 includes, for example, a hook-like body 103 that opens an insulating lower end mainly composed of ceramics, and a metal rectangular cylinder 104 joined to the lower end surface of the hook-like body 103. .
  • the metal square cylinder 104 has its flange portion 105 sealed and fixed to an upper magnetic yoke 210 of an electromagnet unit 200 described later.
  • the top plate 103a of the bowl-shaped body 103 is formed with through holes 106 and 107 through which a pair of fixed contacts 111 and 112, which will be described later, are inserted at predetermined intervals at the center.
  • the contact mechanism 101 includes a pair of fixed contacts 111 and 112 that are inserted into and fixed to the through holes 106 and 107 of the top plate 103 a of the contact storage case 102.
  • Each of the fixed contacts 111 and 112 includes a contact support conductor 114 having a flange portion 113 protruding outward at the upper end inserted through the through holes 106 and 107 of the top plate 103a, and the contact support conductor 114.
  • a contact conductor portion 116 which is connected to the bottom surface of the top plate 103a and has a flat contact portion 115 formed at the inner end thereof.
  • the movable contact 130 is supported by a connecting shaft 131 fixed to a movable iron core 212 of an electromagnet unit 200 described later.
  • the movable contact 130 is formed with a through hole 132 through which the connecting shaft 131 is inserted at the center.
  • the connecting shaft 131 has a fixed ring 131b that is prevented from coming off by a retaining ring 131a made of a C ring or an E ring that protrudes outward at the upper end.
  • a movable contact 130 is moved upward by a contact spring 139 below the fixed ring 131b. Arranged to be energized.
  • the contact conductor portion 116 of the fixed contacts 111 and 112 and the contact portion 115 on the bottom surface thereof are formed in a circular cross section as shown in FIG.
  • the movable contact 130 has both end surfaces in the longitudinal direction centered on the center of the contact portion 115 of the fixed contact 111 and 112 and the diameter of the movable contact 130.
  • the semicircular end faces 130a and 130b are made to coincide with the width W. Therefore, the movable contact 130 is formed in an oval shape when viewed from the plane.
  • the movable contact 130 is in a state in which the contact portions 130c and 130d at both ends and the flat contact portions 115 of the contact conductor portions 116 of the fixed contacts 111 and 112 are separated from each other at a predetermined interval. Further, the movable contact 130 is configured such that the contact portions at both ends are in contact with the flat contact portion 115 at the lower end of the contact conductor portion 116 of the fixed contacts 111 and 112 with a predetermined contact pressure by the contact spring 139 at the closing position. Is set to
  • the inner wall surface of the contact housing case 102 that houses the fixed contacts 111 and 112 and the movable contact 130 is semi-circular end surfaces 130a and 130b of the movable contact 130 in a plan view as shown in FIG.
  • the semi-cylindrical surfaces 102a and 102b centering on the center of the semi-cylindrical surface and the vertical flat surfaces 102c and 102d connecting the edges of the semi-cylindrical surfaces 102a and 102b form an oval wall surface similar to the movable contact 130.
  • the distance from the center position of the contact part 115 of the fixed contacts 111 and 112 to the semi-cylindrical surfaces 102a and 102b of the contact housing case 102 is set equal to any angle of the semi-circular part as viewed from the plane.
  • the outer peripheral side surface of the contact housing case 102 has an outer periphery of a rectangular parallelepiped whose longitudinal center line coincides with the center line of the movable contact 130 and the center line of the inner wall surface. It is formed in the rectangular shape used as a surface. And the permanent magnets 143 and 144 are arrange
  • These permanent magnets 143 and 144 are both magnetized with the N pole on the left end side and the S pole on the right end side, and the magnetic flux formed by both permanent magnets 143 and 144 passes from the fixed contact 111 through the movable contact 130 to the fixed contact. It is set to be opposite to the direction of the current reaching 112.
  • the contact opening portions 130c and 130d of the movable contact 130 are separated from the fixed contacts 111 and 112 downward from the closed contact state in which the contact portions 130c and 130d are in contact with the contact portions 115 of the fixed contacts 111 and 112.
  • an arc is generated from the stationary contacts 111 and 112 as shown in FIG. That is, by the magnetic flux formed by the permanent magnets 143 and 144, on the fixed contact 111 side, the coordinates represented by the center line L0 and the line L1 perpendicular to the center of the contact portion 115 of the fixed contact 111 are An arc is generated in the second quadrant which is the rear.
  • an arc is generated in the fourth quadrant that is the right front at the coordinates represented by the center line L0 and the line L2 that is orthogonal to the center of the contact portion 115 of the fixed contact 112. .
  • the extending direction of these arcs varies depending on the current value of the supply current from the fixed contact 111 to the fixed contact 112 through the movable contact 130.
  • the relationship between the supply current and the force generated in the arc is, as shown in FIG. 3, when the contact housing case 102 is viewed from the plane, the longitudinal direction is the X direction and the short direction (width direction) is Y.
  • the X direction is represented by a characteristic line Lx having a large inclination
  • the Y direction is represented by a characteristic line Ly having a gentle inclination with respect to the characteristic line Lx.
  • These characteristic lines Lx and Ly have an intersection P when the supply current is large.
  • the arc is basically extended in the Y direction to be interrupted, but since a force in the X direction is generated, the extension direction of the arc is changed by the force in the X direction. That is, when a supply current is smaller I S, the force components generated arc in the X direction Chisakuku, the force generated in the arc in the Y direction is large, the arc extends in a substantially Y-direction.
  • the supply current is large value I L through the intersection point P, since the same X direction force component and a Y-direction force components, the arc is extended in a direction inclined 45 degrees from the Y-direction. Further, the supply current is current when an I S and I L intermediate value I M of the extending middle direction between the direction of 45 degrees when the Y direction and the current is large I L.
  • the arc extension direction changes depending on the value of the supply current, the center of the contact portions 115 of the fixed contacts 111 and 112 and the contact portions 130 c and 130 d of the movable contact 130 and the inner wall surface of the contact storage case 102. The distance from the semi-cylindrical surfaces 102a and 102b is not changed. For this reason, even if the arc extends in any direction toward the semi-cylindrical surfaces 102a and 102b, the extension length of the arc does not change. Therefore, the arc is not unstable and can be stably generated.
  • the extended arc is a semi-cylindrical surface. It will contact perpendicularly to 102a and 102b. For this reason, the arc stays at substantially the same circumferential position of the semi-cylindrical surfaces 102a and 102b, the arc shape is not interrupted, and it is possible to reliably prevent the re-occurring arc from being repeated.
  • the electromagnet unit 200 has a U-shaped magnetic yoke 201 as viewed from the side, and a cylindrical auxiliary yoke 203 is fixed to the center of the bottom plate portion 202 of the magnetic yoke 201.
  • a spool 204 is disposed outside the cylindrical auxiliary yoke 203.
  • the spool 204 includes a central cylindrical portion 205 that passes through the cylindrical auxiliary yoke 203, a lower flange portion 206 that protrudes radially outward from the lower end portion of the central cylindrical portion 205, and a little more than the upper end of the central cylindrical portion 205.
  • the upper flange portion 207 protrudes radially outward from the lower side.
  • An exciting coil 208 is wound around a storage space formed by the central cylindrical portion 205, the lower flange portion 206, and the upper flange portion 207.
  • the upper magnetic yoke 210 is fixed between the upper ends of the magnetic yoke 201 serving as the open end.
  • the upper magnetic yoke 210 is formed with a through hole 210a for fitting and supporting the fixed iron core 211 at the center.
  • a fixed iron core 211 is disposed on the upper side of the central cylindrical portion 205 of the spool 204.
  • a movable iron core 212 is arranged at a predetermined distance away from the lower side of the fixed iron core 211 that faces the fixed iron core 211, and a return spring 214 is disposed between the movable iron core 212 and the fixed iron core 211.
  • a connecting shaft 131 that supports the movable contact 130 is fixed to the movable iron core 212.
  • the fixed iron core 211 and the movable iron core 212 are covered with a cap 230 made of a non-magnetic material and formed into a bottomed cylindrical shape, and a flange portion 231 formed by extending outward in the radial direction at the open end of the cap 230. Is sealed to the lower surface of the upper magnetic yoke 210.
  • the contact housing case 102 and the cap 230 form a sealed container in which the contact mechanism 101, the fixed iron core 211, and the movable iron core 212 are arranged in a sealed space.
  • a gas such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, or SF 6 is sealed in a sealed container formed by the contact housing case 102 and the cap 230.
  • the fixed contact 111 is connected to a power supply source that supplies a large current, for example, and the fixed contact 112 is connected to a load.
  • the exciting coil 208 in the electromagnet unit 200 is in a non-excited state and the electromagnet unit 200 is in a released state in which no exciting force for lowering the movable core 212 is generated.
  • the movable iron core 212 is urged by the return spring 214 in a direction away from the fixed iron core 211.
  • the contact portions 130c and 130d of the movable contact 130 of the contact mechanism 101 connected to the movable iron core 212 via the connecting shaft 131 are moved downward by a predetermined distance from the flat contact portions 115 of the fixed contacts 111 and 112. It is separated. For this reason, the current path between the stationary contacts 111 and 112 is in a disconnected state, and the contact mechanism 101 is in an open state.
  • the exciting coil 208 of the electromagnet unit 200 is excited, an exciting force is generated by the electromagnet unit 200, and the movable iron core 212 is attracted by the fixed iron core 211.
  • the iron core 212 is raised against the urging force of the return spring 214.
  • the rising of the movable core 212 is stopped when the upper surface of the movable core 212 contacts the lower surface of the fixed core 211.
  • the movable contact 130 connected to the movable iron core 212 via the connecting shaft 131 is also raised, and the contact portions 130c and 130d thereof are flat with the fixed contacts 111 and 112.
  • the contact portion 115 is contacted by the contact pressure of the contact spring 139. For this reason, a closed state is reached in which a large current of the external power supply source is supplied to the load through the fixed contact 111, the movable contact 130, and the fixed contact 112.
  • the semi-cylindrical surfaces 102a and 102b of the contact housing case 102 are formed concentrically with a vertical line passing through the contact portions 115 of the fixed contacts 111 and 112 and the contact portions 130c and 130d of the movable contact 130. ing.
  • the arc extension length does not change even if the arc extension direction changes, and the arc can be stably generated.
  • the arc makes contact with the semi-cylindrical surfaces 102a and 102b in a vertical plane, the arc stays on the contact surface and does not fluctuate, so that the arc shape is not partially interrupted and the recurring arc is surely prevented. be able to.
  • the arc can be stably ignited and the arc remains without moving in the circumferential direction on the semi-cylindrical surfaces 102a and 102b.
  • the arc can be reliably extinguished when a predetermined arc extension length is reached. Therefore, the interruption
  • the case where the arc extinguishing permanent magnets 143 and 144 are arranged on both end surfaces of the contact housing case 102 in the longitudinal direction has been described.
  • the present invention is limited to the above configuration. It is not a thing.
  • the permanent magnets 145 and 146 may be arranged on the outer peripheral surfaces of the contact housing case 102 facing in the short direction (width direction).
  • the opposing surfaces of the permanent magnets 145 and 146 are of the same polarity, that is, in the case of FIG. 4, the surface contacting the contact housing case 102 of the permanent magnet 145 is the N pole, and the opposite side is the S pole.
  • the surface in contact with the contact housing case 102 is the N pole, and the opposite side is the S pole.
  • the permanent magnets 145 and 146 allow contact between the contact portion 115 of the fixed contactors 111 and 112 and the contact portions 130c and 130d of the movable contactor 130 as shown in FIG.
  • a magnetic flux transverse to the longitudinal direction can be formed between them, and an arc generated at the time of opening by the Lorentz force generated by the magnetic flux and the direction of current is extended to the rear side or the front side of the inner wall of the contact housing case 102. Can do. Even in this case, since the extension length of the arc does not change even if the direction of the arc changes, it is possible to obtain the same effect as the first embodiment described above.
  • permanent magnets 147 a and 147 b and 148 a and 148 b may be arranged on two opposing outer peripheral surfaces of the contact housing case 102.
  • the contact housing case 102 side is the S pole and the opposite side is the N pole.
  • the contact housing case 102 side is the N pole and the opposite side is the S pole.
  • the electromagnet unit 200 has the fixed iron core 211 and the movable iron core 212 .
  • the present invention is not limited to this, and the fixed iron core 211 is omitted, and the upper magnetic yoke 210 and the movable iron core are omitted.
  • a magnetically attracting portion may be formed between the magnetic attraction portion 212 and the magnetic attraction portion 212.
  • the electromagnet unit 200 is not limited to the above configuration, and any configuration can be adopted.
  • the movable contact 130 is driven so as to be able to contact with and separate from the pair of fixed contacts 111 and 112. If you can.
  • the contact container 102 and the cap 230 form a sealed container and the gas is sealed in the sealed container has been described. If it is low, gas filling may be omitted.
  • the present invention is not limited thereto, and the present invention is applied to an electromagnetic switch that electromagnetically opens and closes a contact, such as an electromagnetic relay. Can be applied.
  • Electromagnetic contactor 11 ... Exterior insulation container, 100 ... Contact apparatus, 101 ... Contact mechanism, 102 ... Contact storage case (arc-extinguishing chamber), 103 ... A bowl-shaped body, 104 ... Metal square cylinder body, 111, 112 ... Fixed contact 114, contact support conductor 115, contact 130, movable contact 130a, 130b, semicircular end faces 130c, 130d, contact 131, connecting shaft, 139 contact spring, 143, 144 , 145, 146, 147a, 147b, 148a, 148b ... permanent magnet for arc extinguishing

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

Provided are a contact device whereby it is possible to easily cause extinction of an arc which arises at contact parting time between a fixed contact element and a movable contact element, and an electromagnetic switch using same. The contact device comprises a contact housing case (102) which houses: a pair of fixed contact elements (111, 112) which are in fixed positions with a prescribed interstice maintained therebetween; and a movable contact element (130) which is positioned to be attachable to and detachable from the pair of fixed contact elements. End faces of the movable contact element which face the pair of fixed contact elements are formed as circular arc-shaped end faces (130a, 130b) centered on contact parts, and inner walls of the contact housing case which face the circular arc-shaped end faces of the movable contact element are formed as semi-circular cylindrical faces (102a, 102b) centered on the contact parts of the movable contact element.

Description

接点装置及びこれを使用した電磁開閉器Contact device and electromagnetic switch using the same
　本発明は、所定間隔を保って配置された一対の固定接触子と、これら固定接触子に接離可能に配置された可動接触子とを接点収納ケース内に配置した接点装置及びこれを使用した電磁開閉器に関する。 The present invention uses a contact device in which a pair of fixed contacts arranged at a predetermined interval and a movable contact arranged so as to be able to come in contact with and away from the fixed contacts are arranged in a contact housing case, and the same is used. It relates to an electromagnetic switch.
　電流路の開閉を行う接点装置として、従来、電磁継電器や電磁接触器などの電磁開閉器では、固定接触子及び可動接触子が接触している接点機構の閉成状態から電流を遮断して開成状態とするために可動接触子を固定接触子から離間させる開極時に発生するアークを消弧する接点機構が種々提案されている。 As a contact device that opens and closes a current path, in an electromagnetic switch such as an electromagnetic relay or an electromagnetic contactor, the current is cut off from a closed state of a contact mechanism in which a stationary contact and a movable contact are in contact with each other. Various contact mechanisms have been proposed that extinguish arcs that are generated at the time of opening to move the movable contact away from the fixed contact in order to achieve a state.
　例えば、所定距離だけ離間して配設されたそれぞれ第１の固定接触子及び第２の固定接触子を支持する固定接触子支持筐体と、この固定接触子支持筐体内に前記第１の固定接触子及び第２の固定接触子と接離可能に配置された可動接触子と、可動接触子の長手方向と直行する方向で当該可動接触子を挟んで平行に配置され、互いの対向磁極面が同一極性とされた一対の消弧用磁石体と、前記可動接触子を第１の固定接触子及び第２の固定接触子に対して接離可能に駆動する駆動機構とを備えた電磁接触器が提案されている（例えば、特許文献１参照）。
　ここで、固定接触子支持筐体は、少なくとも第１の固定接触子及び第２の固定接触子と可動接触子との接点部を囲む内壁が可動接触子の長手方向端部に対向する垂直面とこの垂直面の前後端部から可動接触子の長手方向に沿って延長する前後垂直面とで角筒内面形状に形成されている。 For example, a fixed contact support case that supports a first fixed contact and a second fixed contact that are spaced apart by a predetermined distance, and the first fixed contact in the fixed contact support case. A movable contact disposed so as to be able to contact with and separate from the contact and the second fixed contact, and a parallel magnetic pole surface disposed in parallel with the movable contact in the direction perpendicular to the longitudinal direction of the movable contact. Electromagnetic contact provided with a pair of arc extinguishing magnet bodies having the same polarity, and a drive mechanism for driving the movable contact so as to be able to contact with and separate from the first fixed contact and the second fixed contact A device has been proposed (see, for example, Patent Document 1).
Here, the fixed contact support housing is a vertical surface in which the inner wall surrounding at least the first fixed contact and the contact portion between the second fixed contact and the movable contact is opposed to the longitudinal end of the movable contact. The front and rear vertical surfaces extending along the longitudinal direction of the movable contact from the front and rear end portions of the vertical surface are formed in a rectangular tube inner surface shape.
特開２０１２－１６０４２７号公報JP 2012-160427 A
　ところで、上記特許文献１に記載された従来例にあっては、固定接触子支持筐体の内周面で消弧空間となる略密閉空間を形成するようにしており、この消弧空間で、可動接触子の接点が一対の固定接触子の接点から離間する開極時に発生するアークを消弧するようにしている。
　しかしながら、可動接触子と固定接触子支持筐体の内周面との平面視における距離は、可動接触子の端部は方形又は円形に近い形状であるが、固定接触子支持筐体の内周面が角筒状に形成されている。このため、可動接触子の端部と固定接触子支持筐体の内周面との間の間隔は一定とならない。そして、アークの飛ぶ方向は一対の固定接触子に可動接触子が接触したときに電源側から負荷側へ流れる電流値によって変化することにより、アークの飛ぶ方向によってアーク伸長距離が変化することになり、アークの発弧が不安定となるという未解決の課題がある。さらに、アークが固定接触子支持筐体の壁面に対して、垂直に当たらないので、壁面に到達したアークが到達した壁面に留まらずに、アークの形状が部分的に途切れて、再発弧を繰り返すなどアーク遮断性能が低下するという未解決の課題もある。 By the way, in the conventional example described in the above-mentioned Patent Document 1, a substantially sealed space that becomes an arc extinguishing space is formed on the inner peripheral surface of the stationary contact support housing, and in this arc extinguishing space, An arc generated at the time of opening when the contact of the movable contact is separated from the contact of the pair of fixed contacts is extinguished.
However, the distance between the movable contact and the inner peripheral surface of the fixed contact support housing in plan view is such that the end of the movable contact is a square or a circular shape, but the inner periphery of the fixed contact support housing. The surface is formed in a rectangular tube shape. For this reason, the space | interval between the edge part of a movable contact and the internal peripheral surface of a stationary contact support housing | casing is not constant. Then, the arc flying direction changes depending on the current value flowing from the power source side to the load side when the movable contact contacts the pair of fixed contacts, so that the arc extension distance changes depending on the arc flying direction. There is an unsolved problem that the arc is unstable. Furthermore, since the arc does not hit the wall surface of the stationary contact support case perpendicularly, the arc that reaches the wall surface does not stay on the wall surface that reaches the wall surface, and the arc shape is partially interrupted and repeats the arc again. There is also an unsolved problem that the arc interruption performance is reduced.
　そこで、本発明は、上記従来例の未解決の課題に着目してなされたものであり、開極時に発生するアークを安定して消弧することができ、アーク遮断性能を向上させることができる接点装置及びこれを使用した電磁開閉器を提供することを目的としている。 Therefore, the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and can stably extinguish the arc generated at the time of opening of the pole, and can improve the arc interruption performance. An object is to provide a contact device and an electromagnetic switch using the contact device.
　上記目的を達成するために、本発明に係る接点装置の第１の態様は、所定間隔を保って固定配置された一対の固定接触子と、該一対の固定接触子に対して接離可能に配設された可動接触子とを収納する接点収納ケースを備えている。そして、前記可動接触子の前記一対の固定接触子と対向する端面が接点部を中心とする円弧状端面に形成され、且つ前記接点収納ケースの可動接触子の円弧状端面に対向する内壁が前記可動接触子の接点部を中心とする半円筒面に形成されている。 In order to achieve the above object, a first aspect of the contact device according to the present invention is a pair of fixed contacts fixedly arranged at a predetermined interval, and can be contacted and separated with respect to the pair of fixed contacts. A contact storage case for storing the arranged movable contact is provided. An end surface of the movable contact facing the pair of fixed contacts is formed in an arcuate end surface centered on the contact portion, and an inner wall facing the arcuate end surface of the movable contact of the contact storage case is It is formed on a semi-cylindrical surface centered on the contact portion of the movable contact.
　また、本発明に係る接点装置の第２の態様は、前記可動接触子の円弧状端面の直径が、当該可動接触子の幅と等しく設定されて、可動接触子の平面視形状が長円形に形成されている。
　また、本発明に係る接点装置の第３の態様は、前記接点収納ケースの半円筒面の直径が、接点収納ケースの内壁間の幅と等しく設定されて、接点収納ケースの内壁が平面視形状が長円形状に形成されている。
　また、本発明に係る接点装置の第４の態様は、前記接点収納ケースの外周面は直方体形状に形成され、互いに対向する少なくとも一対の外周面に互いに対向するアーク消弧用永久磁石が配置されている。
　また、本発明に係る接点装置の第５の態様は、前記接点収納ケースの外周面は直方体形状に形成され、互いに対向する二対の外周面のそれぞれ互いに対向するアーク消弧用永久磁石が配置されている。 In the second aspect of the contact device according to the present invention, the diameter of the arcuate end surface of the movable contact is set equal to the width of the movable contact, and the planar view shape of the movable contact is an oval. Is formed.
According to a third aspect of the contact device of the present invention, the diameter of the semi-cylindrical surface of the contact storage case is set equal to the width between the inner walls of the contact storage case, and the inner wall of the contact storage case has a shape in plan view. Is formed in an oval shape.
According to a fourth aspect of the contact device of the present invention, the outer peripheral surface of the contact storage case is formed in a rectangular parallelepiped shape, and arc-extinguishing permanent magnets facing each other are arranged on at least a pair of outer peripheral surfaces facing each other. ing.
According to a fifth aspect of the contact device of the present invention, the outer peripheral surface of the contact storage case is formed in a rectangular parallelepiped shape, and two pairs of outer peripheral surfaces facing each other are arranged with arc-extinguishing permanent magnets facing each other. Has been.
　また、本発明に係る接点装置の第６の態様は、互いに対向する前記アーク消弧用磁石の対向面が異極性とされている。
　また、本発明に係る接点装置の第７の態様は、互いに対向する前記アーク消弧用永久磁石の対向面が同極性とされている。
　また、本発明に係る接点装置の第８の態様は、互いに対向する前記アーク消弧用永久磁石の対向面が同極性とされ、一方の一対のアーク消弧用永久磁石の対向面の極性と他方の一対のアーク消去用永久磁石の対向面の極性とが異極性とされている。
　また、本発明に係る電磁開閉器の第１の態様は、前記第１の態様から第７の態様に係る接点装置を備え、前記可動接触子が電磁石装置の可動鉄心に連結され、前記一対の固定接触子が外部接続端子に接続されている。 In the sixth aspect of the contact device according to the present invention, the opposing surfaces of the arc extinguishing magnets facing each other have different polarities.
In the seventh aspect of the contact device according to the present invention, the opposing surfaces of the arc extinguishing permanent magnets facing each other have the same polarity.
Further, according to an eighth aspect of the contact device of the present invention, the opposing surfaces of the arc extinguishing permanent magnets facing each other have the same polarity, and the polarities of the opposing surfaces of one pair of arc extinguishing permanent magnets are the same. The polarity of the opposing surface of the other pair of arc erasing permanent magnets is different.
A first aspect of the electromagnetic switch according to the present invention includes the contact device according to the first to seventh aspects, wherein the movable contact is connected to a movable iron core of an electromagnet device, and the pair of pairs The stationary contact is connected to the external connection terminal.
　本発明によれば、可動接触子と一対の固定接触子との接触位置からこれらを囲む接点収納ケースの内壁面までの距離が半径方向に略等しく設定されているので、可動接触子が一対の固定接触子から離間する開極時に発生するアークの方向が変化してもアークの伸長長さが等しくなり、均一な消弧機能を発揮することができ、アークの再発弧を防止して安定してアークを消弧することができる。
　また、上記効果を有する接点装置を電磁開閉器に適用することにより、簡易な構成で開極時に発生するアークの消弧を確実に行って遮断性能を向上させることができる電磁接触器、電磁継電器等の電磁開閉器を提供することができる。 According to the present invention, the distance from the contact position between the movable contact and the pair of fixed contacts to the inner wall surface of the contact storage case surrounding them is set to be substantially equal in the radial direction. Even if the direction of the arc generated at the time of opening away from the fixed contact is changed, the arc extension length becomes equal, and a uniform arc extinguishing function can be exhibited, preventing the arc from recurring and being stable. The arc can be extinguished.
In addition, by applying the contact device having the above effect to an electromagnetic switch, an electromagnetic contactor and an electromagnetic relay that can improve the breaking performance by surely extinguishing an arc generated at the time of opening with a simple configuration An electromagnetic switch such as can be provided.
本発明を電磁接触器に適用した場合の第１の実施形態を示す断面図である。It is sectional drawing which shows 1st Embodiment at the time of applying this invention to an electromagnetic contactor. 接点収納ケースの概略構成を示す模式図であって、（ａ）は接点収納ケースの天板を取り外した平面図、（ｂ）は（ａ）のＡ－Ａ線上の断面図、（ｃ）は（ａ）のＢ－Ｂ線上の断面図である。It is a schematic diagram showing a schematic configuration of the contact storage case, (a) is a plan view with the top plate of the contact storage case removed, (b) is a cross-sectional view on the AA line of (a), (c) is It is sectional drawing on the BB line of (a). 接点装置に流れる電流とアークに発生する力との関係を示す特性線図である。It is a characteristic diagram which shows the relationship between the electric current which flows into a contact apparatus, and the force which generate | occur | produces in an arc. 本発明の第２の実施形態を示す図２（ａ）と同様の平面図である。It is the same top view as Fig.2 (a) which shows the 2nd Embodiment of this invention. 本発明の第３の実施形態を示す図２（ａ）と同様の平面図である。It is the same top view as Fig.2 (a) which shows the 3rd Embodiment of this invention.
　以下、本発明の実施の形態について図面を伴って説明する。
　図１は本発明に係る接点装置を電磁接触器に適用した場合の第１の実施形態を示す断面図である。この図１において、１０は電磁接触器であり、この電磁接触器１０は接点機構を配置した接点装置１００と、この接点装置１００を駆動する電磁石ユニット２００とで構成されている。
　接点装置１００は、図１及び図２から明らかなように、接点機構１０１を収納する消弧室としての接点収納ケース１０２を有する。この接点収納ケース１０２は、例えばセラミックスを主成分とする絶縁性の下端を開放する桶状体１０３と、この桶状体１０３の下端面に接合された金属角筒体１０４とで構成されている。金属角筒体１０４は、そのフランジ部１０５が後述する電磁石ユニット２００の上部磁気ヨーク２１０にシール接合されて固定されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a first embodiment when the contact device according to the present invention is applied to an electromagnetic contactor. In FIG. 1, reference numeral 10 denotes an electromagnetic contactor. The electromagnetic contactor 10 includes a contact device 100 provided with a contact mechanism and an electromagnet unit 200 that drives the contact device 100.
As is apparent from FIGS. 1 and 2, the contact device 100 includes a contact storage case 102 as an arc extinguishing chamber that stores the contact mechanism 101. The contact housing case 102 includes, for example, a hook-like body 103 that opens an insulating lower end mainly composed of ceramics, and a metal rectangular cylinder 104 joined to the lower end surface of the hook-like body 103. . The metal square cylinder 104 has its flange portion 105 sealed and fixed to an upper magnetic yoke 210 of an electromagnet unit 200 described later.
　また、桶状体１０３の天板１０３ａには、中央部に後述する一対の固定接触子１１１及び１１２を挿通する貫通孔１０６及び１０７が所定間隔を保って形成されている。
　接点機構１０１は、図１に示すように、接点収納ケース１０２の天板１０３ａの貫通孔１０６及び１０７に挿通されて固定された一対の固定接触子１１１及び１１２を備えている。これら固定接触子１１１及び１１２のそれぞれは、天板１０３ａの貫通孔１０６及び１０７に挿通される上端に外方に突出するフランジ部１１３を有する接点支持導体部１１４と、この接点支持導体部１１４に連結されて天板１０３ａの下面側に配設され内方端に平坦な接点部１１５を形成した接点導体部１１６とを備えている。 Further, the top plate 103a of the bowl-shaped body 103 is formed with through holes 106 and 107 through which a pair of fixed contacts 111 and 112, which will be described later, are inserted at predetermined intervals at the center.
As shown in FIG. 1, the contact mechanism 101 includes a pair of fixed contacts 111 and 112 that are inserted into and fixed to the through holes 106 and 107 of the top plate 103 a of the contact storage case 102. Each of the fixed contacts 111 and 112 includes a contact support conductor 114 having a flange portion 113 protruding outward at the upper end inserted through the through holes 106 and 107 of the top plate 103a, and the contact support conductor 114. And a contact conductor portion 116 which is connected to the bottom surface of the top plate 103a and has a flat contact portion 115 formed at the inner end thereof.
　そして、固定接触子１１１及び１１２の接点導体部１１６に下方から対向するように例えば銅製の可動接触子１３０が配設されている。この可動接触子１３０は後述する電磁石ユニット２００の可動鉄心２１２に固定された連結軸１３１に支持されている。この可動接触子１３０は、図１に示すように、中央部に連結軸１３１を挿通する貫通孔１３２が形成されている。
　連結軸１３１は、上端に外方に突出するＣリング又はＥリングでなる止め輪１３１ａによって固定リング１３１ｂが抜け止めされ、この固定リング１３１ｂの下側に可動接触子１３０が接触スプリング１３９によって上方に付勢されて配置されている。 A movable contact 130 made of copper, for example, is disposed so as to face the contact conductor 116 of the fixed contacts 111 and 112 from below. The movable contact 130 is supported by a connecting shaft 131 fixed to a movable iron core 212 of an electromagnet unit 200 described later. As shown in FIG. 1, the movable contact 130 is formed with a through hole 132 through which the connecting shaft 131 is inserted at the center.
The connecting shaft 131 has a fixed ring 131b that is prevented from coming off by a retaining ring 131a made of a C ring or an E ring that protrudes outward at the upper end. A movable contact 130 is moved upward by a contact spring 139 below the fixed ring 131b. Arranged to be energized.
　ここで、固定接触子１１１，１１２の接点導体部１１６及びその底面の接点部１１５は図２（ａ）に示すように、断面円形に形成されている。これに対して、可動接触子１３０は、図２（ａ）に示すように、長手方向の両端面が固定接触子１１１，１１２の接点部１１５の中心を中心とし、直径を可動接触子１３０の幅Ｗと一致させた半円形端面１３０ａ及び１３０ｂとされている。したがって、可動接触子１３０は平面から見て長円形に形成されている。
　この可動接触子１３０は、釈放状態で、両端の接点部１３０ｃ，１３０ｄと固定接触子１１１及び１１２の接点導体部１１６の平坦な接点部１１５とが所定間隔を保って離間した状態となる。また、可動接触子１３０は、投入位置で、両端の接点部が固定接触子１１１及び１１２の接点導体部１１６の下端の平坦な接点部１１５に、接触スプリング１３９による所定の接触圧で接触するように設定されている。 Here, the contact conductor portion 116 of the fixed contacts 111 and 112 and the contact portion 115 on the bottom surface thereof are formed in a circular cross section as shown in FIG. On the other hand, as shown in FIG. 2A, the movable contact 130 has both end surfaces in the longitudinal direction centered on the center of the contact portion 115 of the fixed contact 111 and 112 and the diameter of the movable contact 130. The semicircular end faces 130a and 130b are made to coincide with the width W. Therefore, the movable contact 130 is formed in an oval shape when viewed from the plane.
In the released state, the movable contact 130 is in a state in which the contact portions 130c and 130d at both ends and the flat contact portions 115 of the contact conductor portions 116 of the fixed contacts 111 and 112 are separated from each other at a predetermined interval. Further, the movable contact 130 is configured such that the contact portions at both ends are in contact with the flat contact portion 115 at the lower end of the contact conductor portion 116 of the fixed contacts 111 and 112 with a predetermined contact pressure by the contact spring 139 at the closing position. Is set to
　一方、固定接触子１１１，１１２と可動接触子１３０とを収納する接点収納ケース１０２の内壁面は、図２（ａ）に示すように平面視で、可動接触子１３０の半円形端面１３０ａ及び１３０ｂの中心を中心とする半円筒面１０２ａ及び１０２ｂとこれら半円筒面１０２ａ及び１０２ｂの端縁を結ぶ垂直平坦面１０２ｃ及び１０２ｄとで可動接触子１３０と相似形の長円形の壁面とされている。
　したがって、固定接触子１１１，１１２の接点部１１５の中心位置から接点収納ケース１０２の半円筒面１０２ａ及び１０２ｂまでの距離は平面から見た半円形部の何れの角度でも等しく設定されている。 On the other hand, the inner wall surface of the contact housing case 102 that houses the fixed contacts 111 and 112 and the movable contact 130 is semi-circular end surfaces 130a and 130b of the movable contact 130 in a plan view as shown in FIG. The semi-cylindrical surfaces 102a and 102b centering on the center of the semi-cylindrical surface and the vertical flat surfaces 102c and 102d connecting the edges of the semi-cylindrical surfaces 102a and 102b form an oval wall surface similar to the movable contact 130.
Therefore, the distance from the center position of the contact part 115 of the fixed contacts 111 and 112 to the semi-cylindrical surfaces 102a and 102b of the contact housing case 102 is set equal to any angle of the semi-circular part as viewed from the plane.
　一方、接点収納ケース１０２の外周側面は、図２（ａ）～（ｃ）に示すように、長手方向の中央線が可動接触子１３０の中央線及び内壁面の中央線と一致する直方体の外周面となる長方形状に形成されている。
　そして、接点収納ケース１０２の外周面の長手方向の互いに対向する両端面に永久磁石１４３及び１４４が配置されている。これら永久磁石１４３及び１４４はともに左端側がＮ極に右端側がＳ極に着磁されており、両永久磁石１４３及び１４４で形成される磁束が固定接触子１１１から可動接触子１３０を経て固定接触子１１２に達する電流の方向と逆方向となるように設定されている。 On the other hand, as shown in FIGS. 2A to 2C, the outer peripheral side surface of the contact housing case 102 has an outer periphery of a rectangular parallelepiped whose longitudinal center line coincides with the center line of the movable contact 130 and the center line of the inner wall surface. It is formed in the rectangular shape used as a surface.
And the permanent magnets 143 and 144 are arrange | positioned at the both end surfaces which the longitudinal direction of the outer peripheral surface of the contact storage case 102 mutually opposes. These permanent magnets 143 and 144 are both magnetized with the N pole on the left end side and the S pole on the right end side, and the magnetic flux formed by both permanent magnets 143 and 144 passes from the fixed contact 111 through the movable contact 130 to the fixed contact. It is set to be opposite to the direction of the current reaching 112.
　このため、後述するように可動接触子１３０の接点部１３０ｃ，１３０ｄが固定接触子１１１及び１１２の接点部１１５に接触している閉極状態から固定接触子１１１及び１１２から下方に離間する開極状態となったときに図２（ａ）に示すように固定接触子１１１及び１１２からアークが発生する。すなわち、永久磁石１４３及び１４４によって形成される磁束によって、固定接触子１１１側では中央線Ｌ０と固定接触子１１１の接点部１１５の中心を通って直交する線Ｌ１とで表される座標で、左後方となる第２象限にアークが発生する。同様に、固定接触子１１２側では中央線Ｌ０と固定接触子１１２の接点部１１５の中心を通って直交する線Ｌ２とで表される座標で、右前方となる第４象限にアークが発生する。これらのアークの伸長方向は、固定接触子１１１から可動接触子１３０を経て固定接触子１１２に至る供給電流の電流値によって変化する。 For this reason, as will be described later, the contact opening portions 130c and 130d of the movable contact 130 are separated from the fixed contacts 111 and 112 downward from the closed contact state in which the contact portions 130c and 130d are in contact with the contact portions 115 of the fixed contacts 111 and 112. When the state is reached, an arc is generated from the stationary contacts 111 and 112 as shown in FIG. That is, by the magnetic flux formed by the permanent magnets 143 and 144, on the fixed contact 111 side, the coordinates represented by the center line L0 and the line L1 perpendicular to the center of the contact portion 115 of the fixed contact 111 are An arc is generated in the second quadrant which is the rear. Similarly, on the fixed contact 112 side, an arc is generated in the fourth quadrant that is the right front at the coordinates represented by the center line L0 and the line L2 that is orthogonal to the center of the contact portion 115 of the fixed contact 112. . The extending direction of these arcs varies depending on the current value of the supply current from the fixed contact 111 to the fixed contact 112 through the movable contact 130.
　つまり、供給電流とアークに発生する力との関係は、図３に示すように、接点収納ケース１０２を平面から見たときに、長手方向をＸ方向とし、短手方向（幅方向）をＹ方向としたときに、Ｘ方向については傾きが大きい特性線Ｌｘで表され、Ｙ方向については特性線Ｌｘに対して傾きが緩やかな特性線Ｌｙで表される。これら特性線Ｌｘ及びＬｙは供給電流が大きいときに交点Ｐを有する。
　ここで、アークは基本的にはＹ方向に伸長させて遮断したいが、Ｘ方向の力が発生するため、このＸ方向の力によってアークの伸長方向が変化する。すなわち、供給電流が小さい値ＩＳである場合には、Ｘ方向のアークに発生する力成分は小さくく、Ｙ方向のアークに発生する力は大きいため、アークは略Ｙ方向に伸長する。 In other words, the relationship between the supply current and the force generated in the arc is, as shown in FIG. 3, when the contact housing case 102 is viewed from the plane, the longitudinal direction is the X direction and the short direction (width direction) is Y. In the direction, the X direction is represented by a characteristic line Lx having a large inclination, and the Y direction is represented by a characteristic line Ly having a gentle inclination with respect to the characteristic line Lx. These characteristic lines Lx and Ly have an intersection P when the supply current is large.
Here, the arc is basically extended in the Y direction to be interrupted, but since a force in the X direction is generated, the extension direction of the arc is changed by the force in the X direction. That is, when a supply current is smaller I S, the force components generated arc in the X direction Chisakuku, the force generated in the arc in the Y direction is large, the arc extends in a substantially Y-direction.
　ところが、供給電流が交点Ｐを通る大きい値ＩＬである場合には、Ｘ方向の力成分とＹ方向の力成分が等しいので、アークはＹ方向から４５度傾いた方向に伸長される。
　さらに、供給電流が電流ＩＳ及びＩＬの中間値ＩＭであるときには、Ｙ方向と電流が大きいＩＬときの４５度の方向との中間の方向に伸長する。
　このように、アークの伸長方向が供給電流の値によって変化する場合に、固定接触子１１１，１１２の接点部１１５及び可動接触子１３０の接点部１３０ｃ，１３０ｄの中心と接点収納ケース１０２の内壁面である半円筒面１０２ａ及び１０２ｂとの距離が変化しない。このため、アークが半円筒面１０２ａ及び１０２ｂに向かう何れの方向に伸長してもアークの伸長長さが変化することはない。したがって、アークの発弧が不安定になることがなく、安定して発弧させることができる。 However, when the supply current is large value I L through the intersection point P, since the same X direction force component and a Y-direction force components, the arc is extended in a direction inclined 45 degrees from the Y-direction.
Further, the supply current is current when an I S and I L intermediate value I M of the extending middle direction between the direction of 45 degrees when the Y direction and the current is large I L.
As described above, when the arc extension direction changes depending on the value of the supply current, the center of the contact portions 115 of the fixed contacts 111 and 112 and the contact portions 130 c and 130 d of the movable contact 130 and the inner wall surface of the contact storage case 102. The distance from the semi-cylindrical surfaces 102a and 102b is not changed. For this reason, even if the arc extends in any direction toward the semi-cylindrical surfaces 102a and 102b, the extension length of the arc does not change. Therefore, the arc is not unstable and can be stably generated.
　しかも、半円筒面１０２ａ及び１０２ｂは固定接触子１１１，１１２の接点部１１５及び可動接触子１３０の接点部１３０ｃ，１３０ｄの中心線と同心的に形成されているので、伸長したアークが半円筒面１０２ａ及び１０２ｂに対して垂直に接触することなる。
このため、アークが半円筒面１０２ａ及び１０２ｂの略同一円周位置に留まることになり、アーク形状が途切れることがなく、再発弧を繰り返すことを確実に防止することができる。
　このように、上記構成によると、アークの方向が供給電流によって変化しても、安定した発弧を行うことができるとともにアーク形状が途切れることがなく、再発弧を繰り返すことを確実に防止することができるので、アークを最大限に伸長させた状態で確実に消弧することが可能となる。 In addition, since the semi-cylindrical surfaces 102a and 102b are formed concentrically with the center lines of the contact portions 115 of the fixed contacts 111 and 112 and the contact portions 130c and 130d of the movable contact 130, the extended arc is a semi-cylindrical surface. It will contact perpendicularly to 102a and 102b.
For this reason, the arc stays at substantially the same circumferential position of the semi-cylindrical surfaces 102a and 102b, the arc shape is not interrupted, and it is possible to reliably prevent the re-occurring arc from being repeated.
As described above, according to the above configuration, even when the direction of the arc changes depending on the supply current, stable arcing can be performed and the arc shape is not interrupted, so that repeated recurrence can be reliably prevented. Therefore, the arc can be surely extinguished with the arc extended to the maximum.
　電磁石ユニット２００は、図１に示すように、側面から見てＵ字形状の磁気ヨーク２０１を有し、この磁気ヨーク２０１の底板部２０２の中央部に円筒状補助ヨーク２０３が固定されている。この円筒状補助ヨーク２０３の外側にスプール２０４が配置されている。
　このスプール２０４は、円筒状補助ヨーク２０３を挿通する中央円筒部２０５と、この中央円筒部２０５の下端部から半径方向外方に突出する下フランジ部２０６と、中央円筒部２０５の上端より僅かに下側から半径方向外方に突出する上フランジ部２０７とで構成されている。そして、中央円筒部２０５、下フランジ部２０６及び上フランジ部２０７で構成される収納空間に励磁コイル２０８が巻装されている。 As shown in FIG. 1, the electromagnet unit 200 has a U-shaped magnetic yoke 201 as viewed from the side, and a cylindrical auxiliary yoke 203 is fixed to the center of the bottom plate portion 202 of the magnetic yoke 201. A spool 204 is disposed outside the cylindrical auxiliary yoke 203.
The spool 204 includes a central cylindrical portion 205 that passes through the cylindrical auxiliary yoke 203, a lower flange portion 206 that protrudes radially outward from the lower end portion of the central cylindrical portion 205, and a little more than the upper end of the central cylindrical portion 205. The upper flange portion 207 protrudes radially outward from the lower side. An exciting coil 208 is wound around a storage space formed by the central cylindrical portion 205, the lower flange portion 206, and the upper flange portion 207.
　そして、磁気ヨーク２０１の開放端となる上端間に上部磁気ヨーク２１０が固定されている。この上部磁気ヨーク２１０は、中央部に固定鉄心２１１を嵌合支持する貫通孔２１０ａが形成されている。
　そして、スプール２０４の中央円筒部２０５の上部側に固定鉄心２１１が配置されている。この固定鉄心２１１の対向する下部側に所定距離離間して可動鉄心２１２が配置され、この可動鉄心２１２と固定鉄心２１１との間に復帰スプリング２１４を配設されている。
　そして、可動鉄心２１２に可動接触子１３０を支持する連結軸１３１が固定されている。 The upper magnetic yoke 210 is fixed between the upper ends of the magnetic yoke 201 serving as the open end. The upper magnetic yoke 210 is formed with a through hole 210a for fitting and supporting the fixed iron core 211 at the center.
A fixed iron core 211 is disposed on the upper side of the central cylindrical portion 205 of the spool 204. A movable iron core 212 is arranged at a predetermined distance away from the lower side of the fixed iron core 211 that faces the fixed iron core 211, and a return spring 214 is disposed between the movable iron core 212 and the fixed iron core 211.
A connecting shaft 131 that supports the movable contact 130 is fixed to the movable iron core 212.
　そして、固定鉄心２１１及び可動鉄心２１２が非磁性体製で有底筒状に形成されたキャップ２３０で覆われ、このキャップ２３０の開放端に半径方向外方に延長して形成されたフランジ部２３１が上部磁気ヨーク２１０の下面にシール接合されている。これによって、接点収納ケース１０２及びキャップ２３０によって、接点機構１０１及び固定鉄心２１１、可動鉄心２１２を密閉空間に配置する密封容器が形成されている。また、接点収納ケース１０２及びキャップ２３０で形成される密封容器内に水素ガス、窒素ガス、水素及び窒素の混合ガス、空気、ＳＦ６等のガスが封入されている。 The fixed iron core 211 and the movable iron core 212 are covered with a cap 230 made of a non-magnetic material and formed into a bottomed cylindrical shape, and a flange portion 231 formed by extending outward in the radial direction at the open end of the cap 230. Is sealed to the lower surface of the upper magnetic yoke 210. As a result, the contact housing case 102 and the cap 230 form a sealed container in which the contact mechanism 101, the fixed iron core 211, and the movable iron core 212 are arranged in a sealed space. Further, a gas such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, or SF 6 is sealed in a sealed container formed by the contact housing case 102 and the cap 230.
　次に、上記実施形態の動作を説明する。
　今、固定接触子１１１が例えば大電流を供給する電力供給源に接続され、固定接触子１１２が負荷に接続されているものとする。
　この状態で、電磁石ユニット２００における励磁コイル２０８が非励磁状態にあって、電磁石ユニット２００で可動鉄心２１２を下降させる励磁力を発生していない釈放状態にあるものとする。この釈放状態では、可動鉄心２１２が復帰スプリング２１４によって、固定鉄心２１１から下方に離れる方向に付勢される。
　このため、可動鉄心２１２に連結軸１３１を介して連結されている接点機構１０１の可動接触子１３０の接点部１３０ｃ，１３０ｄが固定接触子１１１及び１１２の平坦な接点部１１５から下方に所定距離だけ離間している。このため、固定接触子１１１及び１１２間の電流路が遮断状態にあり、接点機構１０１が開極状態となっている。 Next, the operation of the above embodiment will be described.
Now, it is assumed that the fixed contact 111 is connected to a power supply source that supplies a large current, for example, and the fixed contact 112 is connected to a load.
In this state, it is assumed that the exciting coil 208 in the electromagnet unit 200 is in a non-excited state and the electromagnet unit 200 is in a released state in which no exciting force for lowering the movable core 212 is generated. In this released state, the movable iron core 212 is urged by the return spring 214 in a direction away from the fixed iron core 211.
For this reason, the contact portions 130c and 130d of the movable contact 130 of the contact mechanism 101 connected to the movable iron core 212 via the connecting shaft 131 are moved downward by a predetermined distance from the flat contact portions 115 of the fixed contacts 111 and 112. It is separated. For this reason, the current path between the stationary contacts 111 and 112 is in a disconnected state, and the contact mechanism 101 is in an open state.
　この釈放状態から、負荷に電力を供給するには、電磁石ユニット２００の励磁コイル２０８を励磁し、電磁石ユニット２００で励磁力を発生させて、可動鉄心２１２を固定鉄心２１１で吸引することにより、可動鉄心２１２を復帰スプリング２１４の付勢力に抗して上昇させる。この可動鉄心２１２上昇が、可動鉄心２１２の上面が固定鉄心２１１の下面に当接することにより停止される。
　このように、可動鉄心２１２が上昇することにより、可動鉄心２１２に連結軸１３１を介して連結されている可動接触子１３０も上昇し、その接点部１３０ｃ，１３０ｄが固定接触子１１１及び１１２の平坦な接点部１１５に接触スプリング１３９の接触圧で接触する。
　このため、外部電力供給源の大電流が固定接触子１１１、可動接触子１３０、及び固定接触子１１２を通じて負荷に供給される閉極状態となる。 In order to supply electric power to the load from this released state, the exciting coil 208 of the electromagnet unit 200 is excited, an exciting force is generated by the electromagnet unit 200, and the movable iron core 212 is attracted by the fixed iron core 211. The iron core 212 is raised against the urging force of the return spring 214. The rising of the movable core 212 is stopped when the upper surface of the movable core 212 contacts the lower surface of the fixed core 211.
As described above, when the movable iron core 212 is raised, the movable contact 130 connected to the movable iron core 212 via the connecting shaft 131 is also raised, and the contact portions 130c and 130d thereof are flat with the fixed contacts 111 and 112. The contact portion 115 is contacted by the contact pressure of the contact spring 139.
For this reason, a closed state is reached in which a large current of the external power supply source is supplied to the load through the fixed contact 111, the movable contact 130, and the fixed contact 112.
　この接点機構１０１の閉極状態から、負荷への電流供給を遮断する場合には、電磁石ユニット２００の励磁コイル２０８の励磁を停止する。
　これによって、電磁石ユニット２００で可動鉄心２１２を上方に移動させる励磁力がなくなることにより、可動鉄心２１２が復帰スプリング２１４の付勢力によって下降する。
　この可動鉄心２１２が下降することにより、連結軸１３１を介して連結された可動接触子１３０が下降する。これに応じて接触スプリング１３９で接触圧を与えている間は可動接触子１３０が固定接触子１１１及び１１２に接触している。その後、接触スプリング１３９の接触圧がなくなった時点で可動接触子１３０が固定接触子１１１及び１１２から下方に離間する開極状態となる。 When the current supply to the load is cut off from the closed state of the contact mechanism 101, the excitation of the excitation coil 208 of the electromagnet unit 200 is stopped.
As a result, the exciting force that moves the movable iron core 212 upward by the electromagnet unit 200 disappears, and the movable iron core 212 is lowered by the urging force of the return spring 214.
When the movable iron core 212 is lowered, the movable contact 130 connected via the connecting shaft 131 is lowered. In response to this, the movable contact 130 is in contact with the stationary contacts 111 and 112 while the contact pressure is applied by the contact spring 139. Thereafter, when the contact pressure of the contact spring 139 disappears, the movable contact 130 is in an open state in which it is separated downward from the fixed contacts 111 and 112.
　この開極状態となると、固定接触子１１１及び１１２の平坦な接点部１１５と可動接触子１３０の接点部１３０ｃ，１３０ｄとの間にアークが発生し、このアークによって電流の通電状態が継続される。
　このとき、前述したように、固定接触子１１１、可動接触子１３０及び固定接触子１１２を流れる供給電流の値によってアークに作用する力のＸ方向成分及びＹ方向成分が変化するので、アークの伸長方向が略４５度の範囲で変化する。
　しかしながら、本実施形態では、固定接触子１１１，１１２の接点部１１５及び可動接触子１３０の接点部１３０ｃ，１３０ｄを通る垂直線と同心状に接点収納ケース１０２の半円筒面１０２ａ及び１０２ｂが形成されている。このため、前述したように、アークの伸長方向が変化してもアークの伸長長さが変化することはなく、アークを安定して発弧させることができる。しかも、アークが半円筒面１０２ａ及び１０２ｂに対して垂直面で接触するのでアークが接触面に留まり、ふらつくことがないので、アーク形状が部分的に途切れることがなく、再発弧を確実に防止することができる。 In this open state, an arc is generated between the flat contact portion 115 of the stationary contacts 111 and 112 and the contact portions 130c and 130d of the movable contact 130, and the current conduction state is continued by this arc. .
At this time, as described above, the X-direction component and the Y-direction component of the force acting on the arc change depending on the value of the supply current flowing through the fixed contact 111, the movable contact 130, and the fixed contact 112. The direction changes in a range of approximately 45 degrees.
However, in the present embodiment, the semi-cylindrical surfaces 102a and 102b of the contact housing case 102 are formed concentrically with a vertical line passing through the contact portions 115 of the fixed contacts 111 and 112 and the contact portions 130c and 130d of the movable contact 130. ing. For this reason, as described above, the arc extension length does not change even if the arc extension direction changes, and the arc can be stably generated. Moreover, since the arc makes contact with the semi-cylindrical surfaces 102a and 102b in a vertical plane, the arc stays on the contact surface and does not fluctuate, so that the arc shape is not partially interrupted and the recurring arc is surely prevented. be able to.
　このように、アークを安定して発弧させることができるとともに、アークが半円筒面１０２ａ及び１０２ｂを円周方向に移動することがなく留まるので、アークの伸長を安定して行うことができ、所定のアーク伸長長さに達したときにアークを確実に消弧することができる。
　したがって、電磁接触器１０の遮断性能を向上させることができる。
　なお、上記第１の実施形態においては、接点収納ケース１０２の長手方向の両端面にアーク消弧用の永久磁石１４３及び１４４を配置した場合について説明したが、本発明は上記構成に限定されるものではない。 Thus, the arc can be stably ignited and the arc remains without moving in the circumferential direction on the semi-cylindrical surfaces 102a and 102b. The arc can be reliably extinguished when a predetermined arc extension length is reached.
Therefore, the interruption | blocking performance of the electromagnetic contactor 10 can be improved.
In the first embodiment, the case where the arc extinguishing permanent magnets 143 and 144 are arranged on both end surfaces of the contact housing case 102 in the longitudinal direction has been described. However, the present invention is limited to the above configuration. It is not a thing.
　すなわち、図４に示すように、接点収納ケース１０２の短手方向（幅方向）対向する外周面に永久磁石１４５及び１４６を配置するようにしてもよい。この場合には、永久磁石１４５及び１４６の対向面を同一極性すなわち、図４の場合永久磁石１４５の接点収納ケース１０２に接する面をＮ極とし、その反対側をＳ極とし、同様に永久磁石１４６についても接点収納ケース１０２に接する面をＮ極とし、その反対側をＳ極とする。
　このように永久磁石１４５及び１４６を配置することにより、両永久磁石１４５及び１４６によって図４に示すよう、固定接触子１１１，１１２の接点部１１５と可動接触子１３０の接点部１３０ｃ、１３０ｄとの間に長手方向に横切る磁束を形成することができ、これら磁束と電流の方向とによって発生するローレンツ力によって開極時に発生するアークを接点収納ケース１０２の内壁の後方側又は前方側に伸長させることができる。
　この場合でも、アークの伸長長さはアークの方向が変化しても変化しないので、上述した第１の実施形態と同様の作用効果を得ることができる。 That is, as shown in FIG. 4, the permanent magnets 145 and 146 may be arranged on the outer peripheral surfaces of the contact housing case 102 facing in the short direction (width direction). In this case, the opposing surfaces of the permanent magnets 145 and 146 are of the same polarity, that is, in the case of FIG. 4, the surface contacting the contact housing case 102 of the permanent magnet 145 is the N pole, and the opposite side is the S pole. As for 146, the surface in contact with the contact housing case 102 is the N pole, and the opposite side is the S pole.
By arranging the permanent magnets 145 and 146 in this manner, the permanent magnets 145 and 146 allow contact between the contact portion 115 of the fixed contactors 111 and 112 and the contact portions 130c and 130d of the movable contactor 130 as shown in FIG. A magnetic flux transverse to the longitudinal direction can be formed between them, and an arc generated at the time of opening by the Lorentz force generated by the magnetic flux and the direction of current is extended to the rear side or the front side of the inner wall of the contact housing case 102. Can do.
Even in this case, since the extension length of the arc does not change even if the direction of the arc changes, it is possible to obtain the same effect as the first embodiment described above.
　さらには、図５に示すように、接点収納ケース１０２の二対の対向する外周面に永久磁石１４７ａ，１４７ｂと１４８ａ，１４８ｂとを配置するようにしてもよい。この場合には、長手方向の永久磁石１４７ａ及び１４７ｂについては接点収納ケース１０２側をＳ極とし、その反対側をＮ極とする。一方、短手方向（幅方向）の永久磁石１４８ａ，１４８ｂについては接点収納ケース１０２側をＮ極とし、その反対側をＳ極とする。
　このように、永久磁石１４７ａ，１４７ｂ及び１４８ａ，１４８ｂを配置し、長手方向及び短手方向で対向面の極性を異極性とすることにより、前述した図４の磁石配置と同方向に大きな磁束を発生することができ、開極時に発生するアークを伸長させるローレンツ力を大きくすることができる。 Further, as shown in FIG. 5, permanent magnets 147 a and 147 b and 148 a and 148 b may be arranged on two opposing outer peripheral surfaces of the contact housing case 102. In this case, for the permanent magnets 147a and 147b in the longitudinal direction, the contact housing case 102 side is the S pole and the opposite side is the N pole. On the other hand, for the permanent magnets 148a and 148b in the short direction (width direction), the contact housing case 102 side is the N pole and the opposite side is the S pole.
In this way, by arranging the permanent magnets 147a, 147b and 148a, 148b and making the opposite surfaces have different polarities in the longitudinal direction and the short direction, a large magnetic flux is generated in the same direction as the magnet arrangement of FIG. The Lorentz force which can generate | occur | produce and can expand | extend the arc generated at the time of opening can be enlarged.
　また、上記実施形態においては、電磁石ユニット２００が固定鉄心２１１及び可動鉄心２１２を有する場合について説明したが、これに限定されるものではなく、固定鉄心２１１を省略し、上部磁気ヨーク２１０と可動鉄心２１２との間に磁気的吸引部を形成するようにしてもよい。
　また、電磁石ユニット２００としては上記構成に限定されるものではなく、任意の構成を採用することができ、要は可動接触子１３０を一対の固定接触子１１１，１１２に対して接離可能に駆動できればよいものである。 In the above embodiment, the case where the electromagnet unit 200 has the fixed iron core 211 and the movable iron core 212 has been described. However, the present invention is not limited to this, and the fixed iron core 211 is omitted, and the upper magnetic yoke 210 and the movable iron core are omitted. A magnetically attracting portion may be formed between the magnetic attraction portion 212 and the magnetic attraction portion 212.
Further, the electromagnet unit 200 is not limited to the above configuration, and any configuration can be adopted. In short, the movable contact 130 is driven so as to be able to contact with and separate from the pair of fixed contacts 111 and 112. If you can.
　また、上記実施形態においては、接点収納ケース１０２及びキャップ２３０で密封容器を構成し、この密封容器内にガスを封入する場合について説明したが、これに限定されるものではなく、遮断する電流が低い場合にはガス封入を省略するようにしてもよい。
　さらに、上記実施形態においては、本発明を電磁接触器に適用した場合について説明したが、これに限定されるものではなく、電磁継電器等の電磁的に接点を開閉極させる電磁開閉器に本発明を適用することができる。 In the above embodiment, the case where the contact container 102 and the cap 230 form a sealed container and the gas is sealed in the sealed container has been described. If it is low, gas filling may be omitted.
Furthermore, although the case where the present invention is applied to an electromagnetic contactor has been described in the above embodiment, the present invention is not limited thereto, and the present invention is applied to an electromagnetic switch that electromagnetically opens and closes a contact, such as an electromagnetic relay. Can be applied.
　１０…電磁接触器、１１…外装絶縁容器、１００…接点装置、１０１…接点機構、１０２…接点収納ケース（消弧室）、１０３…桶状体、１０４…金属角筒体、１１１，１１２…固定接触子、１１４…接点支持導体部、１１５…接点部、１３０…可動接触子、１３０ａ，１３０ｂ…半円形端面、１３０ｃ，１３０ｄ…接点部、１３１…連結軸、１３９…接触スプリング、１４３，１４４、１４５，１４６，１４７ａ，１４７ｂ，１４８ａ，１４８ｂ…アーク消弧用永久磁石 DESCRIPTION OF SYMBOLS 10 ... Electromagnetic contactor, 11 ... Exterior insulation container, 100 ... Contact apparatus, 101 ... Contact mechanism, 102 ... Contact storage case (arc-extinguishing chamber), 103 ... A bowl-shaped body, 104 ... Metal square cylinder body, 111, 112 ... Fixed contact 114, contact support conductor 115, contact 130, movable contact 130a, 130b, semicircular end faces 130c, 130d, contact 131, connecting shaft, 139 contact spring, 143, 144 , 145, 146, 147a, 147b, 148a, 148b ... permanent magnet for arc extinguishing

Claims (9)

  1. 　所定間隔を保って固定配置された一対の固定接触子と、該一対の固定接触子に対して接離可能に配設された可動接触子とを収納する接点収納ケースを備え、
    　前記可動接触子の前記一対の固定接触子と対向する端面が接点部を中心とする円弧状端面に形成され、且つ前記接点収納ケースの可動接触子の円弧状端面に対向する内壁が前記可動接触子の接点部を中心とする半円筒面に形成されている
    　ことを特徴とする接点装置。     A contact storage case for storing a pair of fixed contacts fixedly arranged at a predetermined interval and a movable contact disposed so as to be able to contact with and separate from the pair of fixed contacts;
    An end surface of the movable contact facing the pair of fixed contacts is formed in an arcuate end surface centered on the contact portion, and an inner wall facing the arcuate end surface of the movable contact of the contact storage case is the movable contact. A contact device characterized by being formed on a semi-cylindrical surface centered on the contact portion of the child.
  2. 　前記可動接触子の円弧状端面の直径は、当該可動接触子の幅と等しく設定されて、可動接触子の平面視形状が長円形に形成されていることを特徴とする請求項１に記載の接点装置。 The diameter of the arc-shaped end surface of the movable contact is set to be equal to the width of the movable contact, and the planar view shape of the movable contact is formed in an oval shape. Contact device.
  3. 　前記接点収納ケースの半円筒面の直径は、接点収納ケースの内壁間の幅と等しく設定されて、接点収納ケースの内壁が平面視形状が長円形状に形成されていることを特徴とする請求項１又は２に記載の接点装置。 The diameter of the semi-cylindrical surface of the contact storage case is set to be equal to the width between the inner walls of the contact storage case, and the inner wall of the contact storage case is formed in an oval shape in plan view. Item 3. The contact device according to Item 1 or 2.
  4. 　前記接点収納ケースの外周面は直方体形状に形成され、互いに対向する少なくとも一対の外周面に互いに対向するアーク消弧用永久磁石が配置されていることを特徴とする請求項１から３の何れか１項に記載の接点装置。 4. The arc extinguishing permanent magnet facing each other is arranged on at least a pair of outer peripheral surfaces facing each other, the outer peripheral surface of the contact housing case being formed in a rectangular parallelepiped shape. The contact device according to item 1.
  5. 　前記接点収納ケースの外周面は直方体形状に形成され、互いに対向する二対の外周面のそれぞれ互いに対向するアーク消弧用永久磁石が配置されていることを特徴とする請求項１から３の何れか１項に記載の接点装置。 The outer peripheral surface of the contact housing case is formed in a rectangular parallelepiped shape, and arc extinguishing permanent magnets that are opposed to each other are disposed on two pairs of outer peripheral surfaces that are opposed to each other. The contact device according to claim 1.
  6. 　互いに対向する前記アーク消弧用磁石の対向面が異極性とされていることを特徴とする請求項４又は５に記載の接点装置。 The contact device according to claim 4 or 5, wherein opposing surfaces of the arc extinguishing magnets facing each other have different polarities.
  7. 　互いに対向する前記アーク消弧用永久磁石の対向面が同極性とされていることを特徴とする請求項４又は５に記載の接点装置。 The contact device according to claim 4 or 5, wherein opposing surfaces of the arc extinguishing permanent magnets facing each other have the same polarity.
  8. 　互いに対向する前記アーク消弧用永久磁石の対向面が同極性とされ、一方の一対のアーク消弧用永久磁石の対向面の極性と他方の一対のアーク消去用永久磁石の対向面の極性とが異極性とされていることを特徴とする請求項５に記載の接点装置。 The opposing surfaces of the arc extinguishing permanent magnets facing each other have the same polarity, the polarity of the opposing surface of one pair of arc extinguishing permanent magnets and the polarity of the opposing surface of the other pair of arc extinguishing permanent magnets The contact device according to claim 5, wherein the polarity is different.
  9. 　前記請求項１から８の何れか１項に記載の接点装置を備え、前記可動接触子が電磁石装置の可動鉄心に連結され、前記一対の固定接触子が外部接続端子に接続されていることを特徴とする電磁開閉器。 The contact device according to any one of claims 1 to 8, wherein the movable contact is connected to a movable iron core of an electromagnet device, and the pair of fixed contacts is connected to an external connection terminal. Features an electromagnetic switch.
PCT/JP2013/006441 2012-11-30 2013-10-30 Contact device and electromagnetic switch using same WO2014083769A1 (en)

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