Electromagnetic contactor

Abstract

To protect a wiring connected to an electromagnet from arc gas in an electromagnetic contactor.SOLUTION: An electromagnet 17 includes a bottom yoke 24 and a lead wire 75. A bottom yoke 24 is a plate-like member whose surface direction is perpendicular to the axial direction and separates a case 12 and a cover 13, and has a notch 62 formed in the center of one side when viewed from the axial direction. The lead wire 75 passes through a notch 62, with one end connected to a coil 32 on a side farther from a contact 18 than the bottom yoke 24, and the other end connected to the control circuit on a side closer to the contact 18 than the bottom yoke 24.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to an electromagnetic contactor. [Background technology]

[0002] In the sealed electromagnetic contactor shown in Patent Document 1, the contacts are housed in a sealed metal container with a ceramic lid, and pressurized interrupting gas such as hydrogen is sealed inside, thereby improving the interrupting performance of the contacts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-8697 Summary of the Invention [Problem to be solved by the invention]

[0004] One possible solution is to replace the metal sealed container with a resin one and then coat the entire sealed container with a gas barrier. However, because the resin sealed container contains not only the contacts but also the electromagnet, there is a problem in that the wiring connecting the coil and the coil terminal is exposed to the arc gas. An object of the present invention is to protect wiring connected to an electromagnet in an electromagnetic contactor from arc gas. [Means for solving the problem]

[0005] An electromagnetic contactor according to one aspect of the present invention includes a contact, an electromagnet, and a sealed container. The electromagnet opens and closes the contact along an axial direction. A resin sealed container seals the contact and the electromagnet. The electromagnet includes a yoke and wiring. The yoke is a plate-like member whose surface direction is perpendicular to the axial direction and divides the sealed container, and a notch is formed in the center of one side when viewed from the axial direction. The wiring passes through the notch, and one end is connected to a coil on a side farther from the contact than the yoke, and the other end is connected to a control circuit on a side closer to the contact than the yoke. [Effects of the Invention]

[0006] According to the present invention, the yoke acts as an arc shield and the notch acts as a relief groove for retracting the wiring, thereby protecting the wiring connected to the electromagnet from arc gas. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is a diagram showing the appearance of an electromagnetic contactor. [Figure 2] FIG. 2 is a cross-sectional view of an electromagnetic contactor in a released state. [Figure 3] FIG. 2 is a cross-sectional view of an electromagnetic contactor in a closed state. [Figure 4] FIG. 10 is a diagram illustrating arc driving. [Figure 5] FIG. [Figure 6] FIG. 2 is a diagram showing a bottom yoke, a permanent magnet, and an auxiliary yoke. [Figure 7] FIG. 1 is a diagram illustrating an electromagnet. [Figure 8] FIG. 10 is a diagram showing a state in which the width rib and the bottom yoke are fixed together. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. 10 is a diagram showing a state in which lead wires are connected. [Figure 12] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the drawings are schematic and may differ from the actual product. Furthermore, the following embodiments exemplify devices and methods for embodying the technical concept of the present invention, and are not intended to limit the configuration to those described below. In other words, the technical concept of the present invention can be modified in various ways within the technical scope described in the claims.

[0009] <<Embodiment>> "composition" In the following description, the three mutually orthogonal directions will be referred to as the vertical direction, the width direction, and the axial direction for convenience. FIG. 1 is a diagram showing the appearance of the electromagnetic contactor 11. As shown in FIG. Here, the electromagnetic contactor 11 is shown as viewed from one of the longitudinal directions, one of the width directions, and one of the axial directions. The electromagnetic contactor 11 includes a case 12 and a cover 13 as a sealed container. The case 12 is made of insulating resin and is formed in the shape of a deep container that is closed on both vertical sides, both width sides, and one axial side, and is open on the other axial side. The cover 13 is made of insulating resin and is formed in the shape of a shallow container that is closed on both longitudinal sides, both widthwise sides, and the other axial side, and is open on one axial side. The cover 13 is fitted to the other axial side of the case 12 and fastened with, for example, a bind tapping screw to seal the cover.

[0010] Pressurized barrier gases such as hydrogen and nitrogen are sealed inside the case 12 and cover 13. Therefore, the case 12 and cover 13 are fixed together with an epoxy adhesive, and the entire outer surface, including the bonded area, is gas-barrier coated with a laminated film of clay crystals. Specifically, the interlayer ions of purified smectite are replaced and bound together with an organic binder such as PVA (polyvinyl alcohol) or water-soluble nylon, creating a labyrinth effect that prevents the permeation of gas molecules such as hydrogen and nitrogen. The laminated film is layered in the thickness direction, with a thickness of, for example, 2 μm. The gas-barrier coating is achieved, for example, by spraying a coating liquid into a mist and applying it to the case 12 and cover 13, followed by baking at a temperature of, for example, 150°C or higher, at which the interlayer ions are incorporated into the clay crystals.

[0011] FIG. 2 is a cross-sectional view of the electromagnetic contactor 11 in the released state. Here, a cross section of the electromagnetic contactor 11, passing through the center in the width direction and along the vertical and axial directions, is shown as viewed from one side in the width direction. First, the basic structure of the electromagnetic contactor 11 will be described. The electromagnetic contactor 11 includes a pair of fixed contacts 14, a movable contactor 15, a contact support 16, and an electromagnet 17. The pair of fixed contacts 14 are made of a conductive metal, are formed into a cylindrical shape extending in the axial direction, and are provided on one axial side of the case 12. The pair of fixed contacts 14 are aligned at a distance from each other in the vertical direction, penetrate from the inside to the outside of the case 12, and are integrated with the case 12 by insert molding. The end face of the fixed contact 14 facing the other axial side becomes the fixed contact point.

[0012] The surface of the fixed contact 14 is formed with micron-sized irregularities by chemical etching. This allows the molten resin to penetrate the irregularities during insert molding, and as the resin solidifies, the metal and resin are bonded at the interface, creating a complex bond through a labyrinth effect that prevents leakage of gas molecules such as hydrogen and nitrogen. An example of a metal surface treatment technology is "AMALPHA" (registered trademark) by MEC Co., Ltd. Note that similar surface treatments are also applied to all other metal components insert-molded into the case 12, such as the pipe used to evacuate and seal in the interrupter gas, and the coil terminal connected to the electromagnet 17.

[0013] The movable contactor 15 is made of a conductive metal, extends in the vertical direction, and is formed in the shape of a plate along the vertical and width directions, and is disposed on the other side of the pair of fixed contactors 14 in the axial direction. Both vertical ends of the end face of the movable contactor 15 facing one side in the axial direction become movable contacts facing the fixed contacts. The fixed contact of the fixed contactor 14 and the movable contact of the movable contactor 15 form contact 18, and contact 18 is opened or closed by displacement of the movable contact along the axial direction. The contact support 16 holds the movable contact 15 and a contact spring 19. The contact spring 19 is a compression coil spring that expands and contracts in the axial direction, and biases the movable contact 15 in one axial direction.

[0014] The electromagnet 17 is positioned on the other side of the axial direction from the contact support 16, and includes a spool 21, a plunger 22, an outer yoke 23, a bottom yoke 24 (yoke), a permanent magnet 25, an auxiliary yoke 26, and a back spring 27. The spool 21 is made of insulating resin, and has a coil 32 wound around a cylindrical winding shaft 31 extending in the axial direction. A cylindrical plunger ring 33 is fitted inside the winding shaft 31 on one axial end, and a cylindrical sliding collar 34 is fitted on the other axial end. The plunger 22 is a cylindrical movable iron core extending in the axial direction, and is inserted into a plunger ring 33 and a sliding collar 34 in a state in which it can move axially back and forth. A shaft 35 is fitted into a threaded hole formed in one axial end of the plunger 22, and the shaft 35 is connected to the contact support 16. An armature 36 is connected to the other axial end of the plunger 22. The armature 36 is a disk-shaped yoke that extends in the vertical and width directions.

[0015] The outer yoke 23 is provided to cover both longitudinal sides and one axial side of the spool 21, and is a yoke formed in a generally U-shape that opens toward the other axial side when viewed in the width direction. A shaft 35 is inserted through a round hole that penetrates axially through the flat plates of the outer yoke 23 that are aligned in the longitudinal and width directions. The bottom yoke 24 is a flat yoke extending in the vertical and width directions, and is located on the other side of the axial direction from the winding shaft 31 of the spool 21, and is fixed to the other axial end of the outer yoke 23. The plunger 22 is inserted through the bottom yoke 24 via a circular hole that penetrates in the axial direction.

[0016] The permanent magnet 25 is a flat plate extending in the vertical and width directions, has a circular hole passing through in the axial direction, and is attached to the surface of the bottom yoke 24 facing the other axial direction. The auxiliary yoke 26 is a flat plate extending in the vertical and width directions, has a circular hole passing through it in the axial direction, and is attracted to the surface of the permanent magnet 25 facing the other axial direction. The armature 36 is disposed between the bottom yoke 24 and the auxiliary yoke 26. The back spring 27 is a compression coil spring that expands and contracts in the axial direction, and is interposed between the sliding collar 34 and the armature 36, and biases the plunger 22 in the other axial direction via the armature 36.

[0017] With the above configuration, when the coil 32 is not energized and is in a non-energized state, the magnetic force of the permanent magnet 25 and the repulsive force of the back spring 27 displace the plunger 22 in the opposite axial direction, as shown in FIG. 1 . The magnetic flux of the permanent magnet 25 flows from the front side of the permanent magnet 25 through the bottom yoke 24, outer yoke 23, plunger ring 33, plunger 22, armature 36, and auxiliary yoke 26, in that order, to the rear side of the permanent magnet 25. This closed-loop magnetic circuit attracts the armature 36 to the front side of the auxiliary yoke 26. Thus, when the plunger 22 is displaced in the opposite axial direction, the contacts open via the contact support 16, resulting in a released state. At this time, the armature 36 is spaced apart from the rear side of the bottom yoke 24.

[0018] FIG. 3 is a cross-sectional view of the electromagnetic contactor 11 in the closed state. This figure shows a cross section of the electromagnetic contactor 11, passing through the center of the width direction and taken along the vertical and axial directions, as viewed from one side in the width direction. When the coil 32 is energized and excited, the magnetic force of the coil 32 attracts the armature 36 to the rear surface of the bottom yoke 24. As a result, the plunger 22 is displaced to one side in the axial direction against the magnetic force of the permanent magnet 25 and the repulsive force of the back spring 27. The magnetic flux of the coil 32 flows from the inner surface of the plunger ring 33, through the plunger 22, armature 36, bottom yoke 24, and outer yoke 23, and then to the outer surface of the plunger ring 33. This closed-loop magnetic circuit attracts the armature 36 to the rear surface of the bottom yoke 24. When the plunger 22 is displaced to one side in the axial direction, the contacts are closed via the contact support 16, resulting in a closed state. At this time, the armature 36 is separated from the front surface of the auxiliary yoke 26.

[0019] Next, the driving of the arc will be described. FIG. 4 is a diagram illustrating the driving of the arc. 1A shows a cross section of the electromagnetic contactor 11 with the contact 18 open, passing between the fixed contact 14 and the movable contact 15, along the vertical and width directions, as viewed from one axial direction. A pair of permanent magnets 37 is provided on both vertical sides inside the case 12. The pair of permanent magnets 37 are formed as flat plates along the width and axial directions, and are arranged with their opposite magnetic poles facing each other, generating an external magnetic field φ as indicated by the dotted arrows. At the center of the width of the permanent magnet 37, the external magnetic field φ flows linearly from one vertical direction to the other, but at the outer sides of the width of the permanent magnet 37, it curves outward in the width direction as it moves inward in the vertical direction.

[0020] If the fixed contact 14 on one side of the longitudinal axis is the primary side and the fixed contact 14 on the other side of the longitudinal axis is the secondary side, the arc during interruption flows from one side of the longitudinal axis to the other at the primary side contact 18, and from the other side of the longitudinal axis to the one side at the secondary side contact 18. Taking the primary side as an example, an external magnetic field φ from one side of the longitudinal axis to the other is applied to the arc A1, which flows from one side of the axial axis to the other, and a Lorentz force F1 acts on the arc A2, which is stretched outward in the width direction due to the Lorentz force F1. An external magnetic field φ acts on the arc A2, which flows outward in the width direction as it moves inward in the longitudinal direction, and a Lorentz force F2 acts on the arc A2, which flows outward in the longitudinal direction as it moves outward in the width direction. The same is true for the secondary side. Therefore, the arc during interruption is driven toward two diagonal corners of the case 12 as viewed axially.

[0021] Figure (b) in Figure (a) shows the A-A cross section along the width and axial directions in Figure (a), viewed from one longitudinal direction. Taking the primary side as an example, as indicated by the thick solid arrow, the arc extended outward in the width direction is formed with one current component flowing from the fixed contact 14 to the width direction and the other current component flowing from the width direction to the movable contact 15. The one current component and the other current component are approximately parallel currents with opposite current directions. Therefore, one current component is subjected to a magnetic field around the axis of the other current component, resulting in a Lorentz force acting in one axial direction, while the other current component is subjected to a magnetic field around the axis of the one current component, resulting in a Lorentz force acting in the other axial direction. In other words, the one current component and the other current component are subjected to a Lorentz force F3 that repels each other in the axial direction. However, because the axial space of one current component is limited, the other current component is relatively more axially directed. Therefore, the arc at the time of breaking is driven axially away from the contact 18. The same is true on the secondary side.

[0022] Next, a configuration for protecting the wiring connected to the electromagnet 17 from the arc gas will be described. FIG. 5 is a diagram showing the spool 21. As shown in FIG. (a) in the figure shows the spool 21 as viewed from the other longitudinal direction, one widthwise direction, and the other axial direction. (b) in the figure shows the spool 21 as viewed from the other axial direction. The spool 21 has a flange 41 formed at the other axial end of the reel 31. The flange 41 is formed in a plate shape along the longitudinal and widthwise directions, and is approximately rectangular when viewed from the axial direction. Ribs 42 are formed on the flange 41 on all four sides perpendicular to the axial direction, i.e., on both longitudinal and widthwise sides.

[0023] The rib 42 includes a pair of longitudinal ribs 43 and a pair of width ribs 44. The pair of longitudinal ribs 43 extend in the vertical direction and are formed as plates along the vertical and axial directions, and are formed at both ends of the flange 41 in the width direction. The pair of width ribs 44 extend in the width direction and are formed as plates along the width and axial directions, and connect both ends of the longitudinal ribs 43 to each other. The pair of width ribs 44 are located away from the flange 41 in the other axial direction, and the bottom yoke 24 is inserted into the gap between the flange 41 and the width ribs 44. The four corners of the rib 42 where the longitudinal ribs 43 and the width ribs 44 intersect are reinforced by gussets that are shaped like right isosceles triangles when viewed in the axial direction, and the gussets are formed with cylindrical protrusions 45 that protrude toward the other axial direction.

[0024] An axially extending surrounding wall 46 is formed on the outer peripheral surface of the width rib 44 facing outward in the longitudinal direction. The surrounding wall 46 is closed on the outer side in the longitudinal direction and on both sides in the width direction, and the inner side in the longitudinal direction of the surrounding wall 46 is closed by the width rib 44. One axial end of the surrounding wall 46 is aligned with one axial end of the width rib 44. A binding terminal 51 (internal terminal) is fixed to the outer peripheral surface facing outward in the width direction of each of the pair of vertical ribs 43. The binding terminal 51 is a plate-shaped conductor that extends vertically and is aligned along the vertical and axial directions, and the coil 32 is connected to a binding portion that protrudes in one axial direction, and a lead wire 75 is connected to a flat fitting portion that protrudes outward in the vertical direction (see FIG. 10 ). When the coil 32 is connected to the binding terminal 51, the binding portion is bent inward in the width direction so that it does not protrude outward in the width direction.

[0025] FIG. 6 is a diagram showing the bottom yoke 24, the permanent magnet 25, and the auxiliary yoke 26. This figure shows the bottom yoke 24, permanent magnet 25, and auxiliary yoke 26, which are separated in the axial direction, as viewed from the other side in the vertical direction, one side in the width direction, and the other side in the axial direction. The bottom yoke 24 is a generally rectangular shape elongated in the vertical direction as viewed from the axial direction, with a circular hole 61 penetrating through it in the axial direction at its center. The circular hole 61 has a diameter larger than that of the plunger 22 and smaller than that of the armature 36. The width of the bottom yoke 24 corresponds to the distance between the vertical ribs 43, and the thickness of the bottom yoke 24 corresponds to the gap between the flange 41 and the width rib 44. The bottom yoke 24 has a notch 62 formed at the center of each of two opposing sides in the vertical direction as viewed from the axial direction. The notch 62 is recessed inward in the vertical direction as viewed from the axial direction. The bottom yoke 24 has circular through-holes 63 penetrating through its thickness at the four corners as viewed from the axial direction, on both sides of the notch 62 in the width direction. The bottom yoke 24 is fastened to the case 12 via the through-hole 63, thereby fixing the electromagnet 17 in place.

[0026] The permanent magnet 25 is substantially rectangular when viewed in the axial direction, and has a circular hole 65 formed in the center that penetrates in the axial direction. The circular hole 65 has a diameter larger than that of the armature 36. The vertical dimension of the permanent magnet 25 corresponds to the internal dimension between the width ribs 44, and the width dimension of the permanent magnet 25 corresponds to the internal dimension between the vertical ribs 43. When viewed in the axial direction, the four corners of the permanent magnet 25 are cut at an angle to avoid interference with the gusset when fitted into the rib 42. The auxiliary yoke 26 is substantially rectangular when viewed in the axial direction, and has a circular hole 66 formed in the center that penetrates in the axial direction. The circular hole 66 has a smaller diameter than the armature 36. The vertical dimension of the auxiliary yoke 26 corresponds to the outer dimension between the width ribs 44, and the width dimension of the auxiliary yoke 26 corresponds to the inner dimension between the vertical ribs 43. Circular through holes 67 that penetrate in the axial direction are formed in the four corners of the auxiliary yoke 26. The through holes 67 are fitted into the protrusions 45.

[0027] FIG. 7 is a diagram showing the electromagnet 17. As shown in FIG. Here, the electromagnet 17 is shown as viewed from the other longitudinal direction, one widthwise direction, and the other axial direction. The bottom yoke 24 is inserted longitudinally into the gap between the flange 41 and the width rib 44 of the spool 21, and the outer yoke 23 is fitted onto this bottom yoke 24 from one axial direction and fixed by crimping. The plunger 22 is inserted into the winding shaft 31 of the spool 21 from the other axial direction. A permanent magnet 25 and an auxiliary yoke 26 are fitted inside the rib 42 from the other axial direction. At the four corners as viewed from the other axial direction, the auxiliary yoke 26 is fixed by plastically deforming the tips of the protrusions 45 that fit into the through holes 67. Here, the state before the tips of the protrusions 45 are plastically deformed is shown.

[0028] FIG. 8 is a diagram showing a state in which the width rib 44 and the bottom yoke 24 are fixed together. (a) in the figure shows the electromagnet 17 as viewed from the other axial direction. (b) in the figure shows a cross section of the electromagnet 17, taken along the longitudinal and axial directions and passing through the center in the width direction, as viewed from one width direction. In the area surrounded by the width rib 44, surrounding wall 46, and bottom yoke 24, adhesive 47 is poured from the other axial direction as shown by the hatched area, thereby fixing the width rib 44 and the bottom yoke 24 together. In the width rib 44 and the surrounding wall 46, a step is formed on the opposing inner wall surfaces, narrowing one axial side in both the longitudinal and width directions.

[0029] FIG. 9 is a diagram showing the coil terminal 74. As shown in FIG. 1A shows the coil terminal 74 insert-molded into the case 12 as viewed from one side in the vertical direction, one side in the width direction, and the other side in the axial direction. The case 12 has pilot holes 71 formed in the four corners of the end surface facing the other axial direction, which is the open end. The pilot holes 71 are round holes with bottoms and are formed to align with the through holes 63 in the bottom yoke 24. The electromagnet 17 is fixed to the case 12 by fastening the bottom yoke 24 to the pilot holes 71 using bind tapping screws. The case 12 has an extension portion 73 formed at the other side of the open end in the vertical direction, which extends outward in the vertical direction from an inner circumferential surface 72 along the axial and width directions. The extension portion 73 is a recess formed by an end surface facing inward in the vertical direction, an end surface facing outward in the axial direction, and a pair of end surfaces facing inward in the width direction. A pair of coil terminals 74 (external terminals) protrude from the end surface facing outward in the axial direction.

[0030] 10. (b) in the figure shows a cross section along the vertical and axial directions passing through one coil terminal 74 insert-molded into the case 12, as viewed from one side in the width direction. The coil terminal 74 is a plate-shaped conductor bent into an L-shape when viewed from the width direction, with one side protruding vertically outward from the case 12 and the other side protruding axially outward from an expanded portion 73 of the case 12. The coil terminal 74 is disposed vertically outward of an inner circumferential surface 72 extending in the axial and width directions. One side of the coil terminal 74, which serves as a flat mating portion, is connected to a control circuit, and the other side, which serves as a flat mating portion, is connected to a lead wire 75 (see FIG. 10). The surface treatment of the coil terminal 74 is the same as that of the fixed contact 14 insert-molded.

[0031] FIG. 10 is a diagram showing the lead wire 75. Here, the lead wire 75 (wiring) connected to the binding terminal 51 and the coil terminal 74 is shown as viewed from one longitudinal direction, one widthwise direction, and the other axial direction. The lead wire 75 is a twisted wire that is flexible and easy to handle, and is covered with an insulating coating. Open-barrel receptacle terminals 76 are crimped to both ends of the lead wire 75. Here, the state before the barrels are crimped is shown. The lead wire 75 is connected to the coil 32 by inserting one receptacle terminal 76 vertically into the flat fitting portion of the binding terminal 51. The lead wire 75 is connected to an external control circuit by inserting the other receptacle terminal 76 axially into the flat fitting portion of the coil terminal 74.

[0032] FIG. 11 is a diagram showing the state in which the lead wire 75 is connected. FIG. 1A shows the lead wire 75 connected to the binding terminal 51 and the coil terminal 74 as viewed from the other side in the vertical direction, one side in the width direction, and the other side in the axial direction. FIG. 1B shows the lead wire 75 connected to the binding terminal 51 and the coil terminal 74 as viewed from the other side in the axial direction. The electromagnet 17 is fixed to the case 12 by fastening the bottom yoke 24, and the lead wire 75 is connected to the binding terminal 51 and the coil terminal 74. One end of the lead wire 75 is connected to the binding terminal 51, extends outward in the vertical direction from the outside in the width direction, extends inward in the width direction from the outside in the vertical direction of the inner peripheral surface 72 of the case 12, passes through the notch 62 in the bottom yoke 24, and extends inward in the axial direction, and the other end is connected to the coil terminal 74.

[0033] <<Action and Effect>> Next, the main effects of the embodiment will be described. The electromagnetic contactor 11 includes a contact 18, an electromagnet 17, a case 12, and a cover 13. The electromagnet 17 opens and closes the contact 18 in the axial direction. The case 12 and cover 13 are made of resin and seal the contact 18 and the electromagnet 17. The electromagnet 17 includes a bottom yoke 24 and a lead wire 75. The bottom yoke 24 is plate-shaped, with its surface perpendicular to the axial direction and separating the case 12 and the cover 13. A notch 62 is formed in the center of one side as viewed from the axial direction. The lead wire 75 passes through the notch 62, with one end connected to the coil 32 on a side farther from the contact 18 than the bottom yoke 24, and the other end connected to the control circuit on a side closer to the contact 18 than the bottom yoke 24. As a result, the bottom yoke 24 acts as an arc shield, and the notch 62 serves as a relief groove for the lead wire 75 to escape. Therefore, the lead wire 75 connected to the electromagnet 17 can be protected from arc gas.

[0034] The electromagnetic contactor 11 includes a binding terminal 51 and a coil terminal 74. The binding terminal 51 is connected to the coil 32 on a side farther from the contact 18 than the bottom yoke 24. The coil terminal 74 is drawn out of the case 12 on a side closer to the contact 18 than the bottom yoke 24 and is connected to a control circuit. One end of the lead wire 75 is connected to the binding terminal 51, and the other end is connected to the coil terminal 74. This allows the lead wire 75 connected to the electromagnet 17 to be protected from arc gas. The electromagnetic contactor 11 is equipped with a permanent magnet 37. The permanent magnet 37 drives the arc toward two diagonal corners as viewed from the axial direction, and toward the side farther from the contact 18 in the axial direction. This prevents the arc from jumping toward the notch 62 as viewed from the axial direction. Therefore, the bottom yoke 24 acts as an arc shield more effectively, and the lead wire 75 connected to the electromagnet 17 can be protected from the arc gas.

[0035] The notches 62 are formed in the centers of two opposing sides of the bottom yoke 24 when viewed from the axial direction, respectively. This allows the bottom yoke 24 to be used in either orientation when viewed from the axial direction, improving assembly ease. The bottom yoke 24 is disposed on the side farther from the contact 18 than the coil 32. This allows the lead wire 75 passing through the notch 62 to be disposed as far away from the contact 18 as possible, thereby protecting it from arc gas. The coil terminal 74 is disposed on the side of the coil 32 and axially closer to the bottom yoke 24. This allows the coil terminal 74 to be disposed as far away from the contact 18 as possible, thereby protecting it from arc gas.

[0036] The case 12 has an extension 73 formed on the axial side farther from the contact 18. The extension 73 extends outward in the direction perpendicular to the axis from an inner circumferential surface 72 along the axial direction. The coil terminal 74 is disposed in the extension 73. This protects the coil terminal 74 from arc gas. The notch 62 is formed in a concave shape that is concave from the outer side in the axis-perpendicular direction toward the inner circumferential surface as viewed from the axial direction, thereby protecting the lead wire 75 passing through the notch 62 from arc gas.

[0037] The lead wire 75 is disposed on the outer side of the inner circumferential surface in the direction perpendicular to the axis when viewed from the axial direction, thereby making it possible to protect the lead wire 75 from the arc gas. The lead wire 75 is covered with an insulating coating, which can protect the lead wire 75 from arc gas. The lead wires 75 are twisted wires, which makes it easier to wire them by taking advantage of the flexibility of the lead wires 75. The coil terminals 74 are insert-molded into the case 12, which improves assembly. The coil terminals 74 are surface-treated by chemical etching, which can prevent leakage of the interrupter gas sealed in the case 12 and cover 13.

[0038] The electromagnet 17 includes a spool 21. The spool 21 has a coil 32 wound around a winding shaft 31, and ribs 42 surrounding the spool 21 on all four sides perpendicular to the axial direction. The ribs 42 include a pair of longitudinal ribs 43 and a pair of width ribs 44. The pair of longitudinal ribs 43 are provided on both sides in the width direction perpendicular to the axial direction, extending in the longitudinal direction perpendicular to the axial direction and supported by a flange 41 of the spool 21. The pair of width ribs 44 are provided on both sides in the longitudinal direction, extending in the width direction, and both ends are supported by the ends of the longitudinal ribs 43, spaced apart from the flange 41 in the axial direction. The bottom yoke 24 is inserted between the flange 41 and the width rib 44. The width rib 44 has a surrounding wall 46 along the axial direction on its outer peripheral surface facing outward in the longitudinal direction. An adhesive 47 is poured into the area surrounded by the width rib 44, the surrounding wall 46, and the bottom yoke 24. This allows the width rib 44 to be fixed to the bottom yoke 24. Furthermore, since a step is formed on the opposing inner wall surfaces of the width rib 44 and the surrounding wall 46, the width rib 44 can be fixed to the bottom yoke 24 more firmly.

[0039] Next, a comparative example will be described. FIG. 12 is a diagram showing a comparative example. Here, the sealed container 81 is shown as viewed from one side in the vertical direction, one side in the width direction, and one side in the axial direction. The sealed container 81 is closed by a ceramic lid 82 and a metal container 83, and contains contacts inside and is filled with pressurized breaking gas such as hydrogen. This prevents the wiring connected to the electromagnet 84 from being exposed to the arc gas. It is conceivable to change such a sealed container 81 from metal to resin and apply a gas barrier coating to the entire sealed container. Because the resin sealed container contains not only the contacts but also the electromagnet, there was a problem in that the wiring connecting the coil and coil terminals would be exposed to the arc gas.

[0040] Although the present invention has been described above with reference to a limited number of embodiments, the scope of the invention is not limited thereto, and modifications of the embodiments based on the above disclosure will be obvious to those skilled in the art. [Explanation of symbols]

[0041] 11...electromagnetic contactor, 12...case, 13...cover, 14...fixed contact, 15...movable contact, 16...contact support, 17...electromagnet, 18...contact, 19...contact spring, 21...spool, 22...plunger, 23...outer yoke, 24...bottom yoke, 25...permanent magnet, 26...auxiliary yoke, 27...back spring, 31...winding shaft, 32...coil, 33...plunger ring, 34...sliding collar, 35...shaft, 36... -Mature, 37...Permanent magnet, 41...Flange, 42...Rib, 43...Vertical rib, 44...Width rib, 45...Protrusion, 46...Enclosure wall, 47...Adhesive, 51...Tie-up terminal, 61...Circular hole, 62...Notch, 63...Through hole, 65...Circular hole, 66...Circular hole, 67...Through hole, 71...Pre-hole, 72...Inner surface, 73...Extension portion, 74...Coil terminal, 75...Lead wire, 76...Receptacle terminal, 81...Sealed container, 82...Cover, 83...Container, 84...Electromagnet

Claims

1. Contact points and an electromagnet that opens and closes the contacts in an axial direction; a resin-made sealed container that seals the contacts and the electromagnet, The electromagnet is a plate-like yoke whose surface direction is perpendicular to the axial direction and divides the sealed container, and which has a notch formed in the center of one side as viewed from the axial direction; a wiring that passes through the notch, one end of which is connected to the coil on a side farther from the contact point than the yoke, and the other end of which is connected to a control circuit on a side closer to the contact point than the yoke.

2. an internal terminal connected to the coil on a side farther from the contact point than the yoke; an external terminal that is drawn out of the sealed container on a side closer to the contact than the yoke and is connected to the control circuit, 2. The electromagnetic contactor according to claim 1, wherein one end of the wire is connected to the internal terminal and the other end is connected to the external terminal.

3. 2. The electromagnetic contactor according to claim 1, further comprising permanent magnets for driving the arc toward two diagonal corners as viewed in the axial direction and toward a side in the axial direction farther from the contacts.

4. 2. The electromagnetic contactor according to claim 1, wherein the notches are formed at the centers of two opposing sides of the yoke when viewed in the axial direction.

5. 3. The electromagnetic contactor according to claim 2, wherein the yoke is disposed farther from the contacts than the coil.

6. 6. The electromagnetic contactor according to claim 5, wherein the external terminal is disposed on a side of the coil and on a side closer to the yoke in the axial direction.

7. The sealed container has an extension portion formed on a side farther from the contact point in the axial direction, the extension portion extending outward in the axis-perpendicular direction than an inner peripheral surface along the axial direction, 7. The electromagnetic contactor according to claim 6, wherein the external terminal is disposed in the extension portion.

8. 8. The electromagnetic contactor according to claim 7, wherein the notch is formed in a concave shape that is concave from an outer side of the inner peripheral surface in the axis-perpendicular direction toward the inner peripheral surface when viewed from the axial direction.

9. 9. The electromagnetic contactor according to claim 8, wherein the wiring is arranged outside the inner peripheral surface in the direction perpendicular to the axis when viewed in the axial direction.

10. 2. The electromagnetic contactor according to claim 1, wherein the wiring is covered with an insulating coating.

11. 2. The electromagnetic contactor according to claim 1, wherein the wiring is a twisted wire.

12. 3. The electromagnetic contactor according to claim 2, wherein the external terminal is insert-molded into the sealed container.

13. The electromagnet is The coil is wound around a winding shaft, and a spool is provided with ribs surrounding the coil on all four sides perpendicular to the axial direction. The rib is a pair of longitudinal ribs provided on both sides in a width direction perpendicular to the axial direction, extending in a longitudinal direction perpendicular to the axial direction, and supported by a flange of the spool; a pair of width ribs provided on both sides in the longitudinal direction, extending in the width direction, and supported at both ends by the ends of the longitudinal ribs while spaced apart from the flange in the axial direction; The yoke is inserted between the flange and the width rib, The width rib has an outer peripheral surface facing outward in the longitudinal direction, and a surrounding wall along the axial direction is formed on the outer peripheral surface.

2. The electromagnetic contactor according to claim 1, wherein an adhesive is poured into an area surrounded by the width rib, the surrounding wall, and the yoke.

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