Electromagnetic contactor

Abstract

To effectively suppress rattle around the axis of a contact support in an electromagnetic contactor.SOLUTION: A contact support 16 supports a movable contactor 15. An electromagnet 17 moves a contact support 16 forward and backward in the axial direction. The fixed plates 43 are fixed to the fixed side of the electromagnet 17, are arranged at the four corners of the contact support 16 when viewed from the axial direction, protrude toward the contact support 16, and are parallel to each other. The movable plates 53 are fixed to the contact support 16, protrude toward the electromagnet 17, and face the inner circumferential surface of the fixed plates 43.SELECTED DRAWING: Figure 12

Description

[Technical Field]

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

[0002] The electromagnetic contactor disclosed in Patent Document 1 has guides at the center of two opposing sides of the contact support, which moves back and forth together with the plunger, to regulate angular deviation around the axis of the contact support and stabilize the opening and closing operation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-91238 Summary of the Invention [Problem to be solved by the invention]

[0004] The guide has some play to ensure smooth movement of the contact support, but a structure with guides only in the center of the two opposing sides can cause rattle around the axis, leaving room for improvement. An object of the present invention is to effectively suppress rattle around an axis in a contact support in an electromagnetic contactor. [Means for solving the problem]

[0005] An electromagnetic contactor according to one aspect of the present invention includes a contact support, an electromagnet, a first fixed plate, and a first movable plate. The contact support supports a movable contact. The electromagnet moves the contact support forward and backward along the axial direction. The first fixed plates are fixed to the fixed side of the electromagnet, are arranged at four corners of the contact support when viewed from the axial direction, protrude toward the contact support, and are parallel to each other. The first movable plates are fixed to the contact support, protrude toward the electromagnet, and face the inner circumferential surface of the first fixed plate. [Effects of the Invention]

[0006] According to the present invention, the first movable plate faces the inner surface of the first fixed plate arranged parallel to the four corners of the contact support, thereby effectively suppressing rattling around the axis of the contact support. [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 shows a contact support and an electromagnet. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 2 is a view showing an outer yoke and a fixed guide. [Figure 8] FIG. [Figure 9] FIG. 10 shows parts that are insert molded into the contact support. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. 2 is a diagram showing a fixed guide and a movable guide. [Figure 13] FIG. 4 is a cross-sectional view of a fixed guide and a movable guide. [Figure 14] FIG. 2 is a diagram showing a fixed guide and a movable guide. [Figure 15] FIG. 4 is a cross-sectional view of a fixed guide and a movable guide. [Figure 16] FIG. 10 is a diagram showing a contact support and an electromagnet of a comparative example. 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 side in the vertical direction, one side in the width direction, and one side in the axial direction. The electromagnetic contactor 11 includes a case 12 and a cover 13. 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 a plate shape 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 that face the fixed contacts, and the contacts are opened and closed by displacement along the axial direction. The contact support 16 holds the movable contact 15 and a contact spring 18. The contact spring 18 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 contact support 16 in the axial direction, and includes a spool 21, a plunger 22, an outer yoke 23 (yoke), a bottom yoke 24, 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 cause the plunger 22 to be displaced in the other axial direction. The magnetic flux of the permanent magnet 25 passes 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 this order, and reaches 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 other axial direction, the contacts are opened via the contact support 16, resulting in a released state. At this time, the armature 36 is separated from 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 close via the contact support 16, resulting in a closed state. At this time, the armature 36 is separated from the auxiliary yoke 26.

[0019] Next, suppression of rattle around the axis of the contact support 16 will be described. FIG. 4 is a diagram showing the contact support 16 and the electromagnet 17. As shown in FIG. Here, the contact support 16 and electromagnet 17 are shown as viewed from one vertical direction, one width direction, and one axial direction. The electromagnetic contactor 11 is equipped with a fixed guide 41 and a movable guide 51 to suppress rattle around the axis of the contact support 16. The fixed guide 41 is fixed to the outer yoke 23, which is the fixed side of the electromagnet 17. The movable guide 51 is fixed to the contact support 16 and fits into the fixed guide 41 in a state where only axial displacement is allowed.

[0020] FIG. 5 is a diagram showing the outer yoke 23. As shown in FIG. Here, the outer yoke 23 is shown as viewed from one side in the vertical direction, one side in the width direction, and one side in the axial direction. Four protrusions 37 that protrude toward one side in the axial direction are formed on the flat plate of the outer yoke 23 along the vertical and width directions. The protrusions 37 are formed by doweling and are aligned in the vertical and width directions. FIG. 6 is a diagram showing the fixed guide 41. As shown in FIG. (a) in the figure shows the fixed guide 41 as seen from one longitudinal direction, one width direction, and one axial direction. (b) in the figure shows the fixed guide 41 as seen from one axial direction, (c) in the figure shows the fixed guide 41 as seen from one width direction, and (d) in the figure shows the fixed guide 41 as seen from one longitudinal direction. The fixed guide 41 is formed by bending a single stainless steel plate with a uniform thickness, and includes a bottom plate 42, four fixed plates 43 (first fixed plates), and two fixed plates 44 (second fixed plates).

[0021] The bottom plate 42 is a flat plate extending in the vertical and width directions and is formed in a generally cross shape when viewed in the axial direction. The bottom plate 42 has through holes 45 formed in the thickness direction at the four corners of an area extending in the vertical direction when viewed in the axial direction. The through holes 45 are positioned to align with the protrusions 37 of the outer yoke 23. The bottom plate 42 has a circular hole 46 formed in the center when viewed in the axial direction and penetrating in the thickness direction. The circular hole 46 has a diameter larger than that of the shaft 35. The four fixing plates 43 are arranged at the four corners of the contact support 16 when viewed from the axial direction, protrude toward the contact support 16, and are parallel flat plates extending along the width and axial directions. Specifically, the four fixing plates 43 are formed by bending along two parallel sides extending in the width direction, so that the four fixing plates 43 face each other in the vertical direction on one side and the other side in the width direction. The internal dimension between the fixing plates 43 in the vertical direction is defined as D1.

[0022] The two fixing plates 44 are arranged on two sides perpendicular to the fixing plate 43 when viewed from the axial direction, protrude toward the contact support 16, and are parallel flat plates. Specifically, the two fixing plates 44 are formed by bending along the two parallel sides extending vertically, so that the two fixing plates 44 face each other in the width direction at the center in the vertical direction. The internal dimension between the fixing plates 44 in the width direction is W1. FIG. 7 is a diagram showing the outer yoke 23 and the fixed guide 41. As shown in FIG. Here, the fixed guide 41 fixed to the outer yoke 23 is shown as viewed from one longitudinal direction, one width direction, and one axial direction. The through holes 45 of the fixed guide 41 are fitted onto the protrusions 37 of the outer yoke 23, and the tips of the protrusions 37 are crimped and plastically deformed, thereby fixing the fixed guide 41 to the outer yoke 23. Here, the state before the tips of the protrusions 37 are plastically deformed is shown.

[0023] FIG. 8 is a diagram showing the movable guide 51. As shown in FIG. (a) in the figure shows the movable guide 51 as viewed from one vertical direction, one width direction, and one axial direction. (b) in the figure shows the movable guide 51 as viewed from one axial direction, (c) in the figure shows the movable guide 51 as viewed from one width direction, and (d) in the figure shows the movable guide 51 as viewed from one vertical direction. The movable guide 51 is formed by bending a single stainless steel plate with a uniform thickness, and includes a top plate 52, two movable plates 53 (first movable plates), and two movable plates 54 (second movable plates). The top plate 52 is a flat plate extending in the width and length directions and is formed in a square shape when viewed in the axial direction. A through hole 55 is formed in the top plate 52 at the center when viewed in the axial direction, penetrating the plate in the thickness direction. The shaft 35 is connected to the through hole 55. The top plate 52 is formed with through holes 56 on both sides of the through hole 55 along the width direction, penetrating the plate in the thickness direction. The through holes 56 allow molten resin to pass through during insert molding, and are filled with molten resin.

[0024] The two movable plates 53 are flat plates that protrude toward the electromagnet 17 and face the inner circumferential surface of the fixed plate 43. Specifically, the two movable plates 53 are formed by bending along two parallel sides extending in the width direction, so that the two movable plates 53 face each other in the vertical direction. When viewed from the axial direction, the two movable plates 53 face each other in the current-carrying direction of the movable contactor 15. The outer dimension D2 between the movable plates 53 along the vertical direction is defined as D2. The outer dimension D2 between the movable plates 53 is slightly smaller than the inner dimension D1 between the fixed plates 43. An opening 57 is formed at the corner where the top plate 52 and the movable plate 53 intersect, penetrating through in the thickness direction. The opening 57 allows molten resin to pass through and is filled with molten resin during insert molding. The two movable plates 54 are flat plates that protrude toward the electromagnet 17 and face the inner circumferential surface of the fixed plate 44. Specifically, the two movable plates 54 are formed by bending along two parallel sides extending in the vertical direction, so that the two movable plates 54 face each other in the width direction. The outer dimension W2 between the movable plates 54 in the width direction is defined as W2. The outer dimension W2 between the movable plates 54 is slightly smaller than the inner dimension W1 between the fixed plates 44.

[0025] FIG. 9 shows the components that are insert molded into the contact support 16. As shown in FIG. FIG. 1A shows the cage 61 insert-molded into the contact support 16, viewed from one side in the vertical direction, one side in the width direction, and one side in the axial direction. The cage 61 is formed by bending a single stainless steel plate with a uniform thickness. It includes a top plate 62 and two side plates 63. The top plate 62 is a flat plate extending in the width and vertical directions and is rectangular when viewed from the axial direction. The two side plates 63 protrude toward the electromagnet 17 and have tips protruding on both sides in the vertical direction, forming a roughly T-shaped flat plate upside down when viewed from the width direction. Specifically, the pair of side plates 63 facing each other in the width direction are formed by bending along two parallel sides extending in the vertical direction. The side plates 63 have through holes 64 formed in the thickness direction at the tips protruding on both sides in the vertical direction. Four through holes 64 are formed along the vertical direction. The through holes 64 allow molten resin to pass through during insert molding and are filled with the molten resin.

[0026] Figure (b) shows the movable guide 51 and shaft 35, which are insert-molded into the contact support 16, as viewed from one of the vertical directions, one of the width directions, and one of the axial directions. The movable guide 51 has the tip of the shaft 35 fitted into the through-hole 55, and the shaft 35 is fixed by crimping the tip of the shaft 35 to cause plastic deformation. Here, the state after the tip of the shaft 35 has been plastically deformed is shown. FIG. 10 is a diagram showing the contact support 16. As shown in FIG. (a) in the figure shows the contact support 16 after insert molding as seen from one vertical direction, one width direction, and one axial direction. (b) in the figure shows the contact support 16 after insert molding as seen from one vertical direction, one width direction, and the other axial direction. The contact support 16 is made of insulating resin, and the movable guide 51, shaft 35, and cage 61 are integrated into the contact support 16 by insert molding. The movable guide 51 has the center of the outer peripheral surface of the movable plate 53 in the width direction covered by the cover portion 71 of the contact support 16, and the exposed both sides face the inner peripheral surface of the fixed plate 43.

[0027] FIG. 11 is a cross-sectional view of the contact support 16. As shown in FIG. (a) in the figure shows a cross section of the contact support 16 after insert molding, taken along the vertical and axial directions and passing through the center in the width direction, as viewed from one side in the width direction. (b) in the figure shows a cross section of the contact support 16 after insert molding, taken along the vertical and axial directions and passing through the center in the vertical direction, as viewed from one side in the vertical direction. One axial end of the movable guide 51 and the shaft 35 is embedded in the contact support 16, and the through hole 56 and opening 57 of the movable guide 51 are filled with the resin of the contact support 16. The other axial end of the cage 61 is embedded in the contact support 16, and the through hole 64 of the cage 61 is filled with the resin of the contact support 16.

[0028] FIG. 12 is a diagram showing the fixed guide 41 and the movable guide 51. As shown in FIG. 1A shows the fixed guide 41 and the movable guide 51 viewed from one longitudinal direction, one width direction, and one axial direction when the electromagnet 17 is turned off and in the released state. FIG. 1B shows the fixed guide 41 and the movable guide 51 viewed from one axial direction when the electromagnet 17 is turned off and in the released state. Here, the contact support 16 is omitted to clarify the positional relationship between the fixed guide 41 and the movable guide 51. The fixed guide 41 and the movable guide 51 are fitted together in the axial direction. At this time, the outer peripheral surface of the movable plate 53 faces the inner peripheral surface of the fixed plate 43 on both longitudinal sides, and the outer peripheral surface of the movable plate 54 faces the inner peripheral surface of the fixed plate 44 on both widthwise sides. Therefore, the movable guide 51 is prevented from moving in the longitudinal direction, the widthwise direction, and around the axis, and is only displaceable in the axial direction. The contact support 16 is also only displaceable in the axial direction without interfering with the fixed guide 41.

[0029] FIG. 13 is a cross-sectional view of the fixed guide 41 and the movable guide 51. As shown in FIG. 12(b) shows a cross section A-A along the longitudinal and axial directions passing through the fixed plate 43 and the movable plate 53 on one side of the width direction in FIG. 12(b). FIG. 12(b) shows a cross section B-B along the longitudinal and axial directions passing through the fixed plate 44 and the movable plate 54 in FIG. 12(b) as viewed from one side of the width direction. When the electromagnet 17 is turned off and in a released state, the movable plate 53 faces the fixed plate 43 at approximately the center in the axial direction, and the movable plate 54 faces the fixed plate 44 at approximately the center in the axial direction. Contact between the movable plate 53 and the fixed plate 43 generates sliding resistance, so it is desirable for them to be close to each other without contact. Therefore, a slight amount of play is provided between the movable plate 53 and the fixed plate 43, and between the movable plate 54 and the fixed plate 44.

[0030] FIG. 14 is a diagram showing the fixed guide 41 and the movable guide 51. As shown in FIG. FIG. 1A shows the fixed guide 41 and the movable guide 51 when the electromagnet 17 is turned on and in the closed state, as viewed from one side in the vertical direction, one side in the width direction, and one side in the axial direction. FIG. 1B shows the fixed guide 41 and the movable guide 51 when the electromagnet 17 is turned on and in the closed state, as viewed from one side in the axial direction. Here, the contact support 16 is omitted to clarify the positional relationship between the fixed guide 41 and the movable guide 51. Even when the electromagnet 17 is turned on and in the closed state, the fixed guide 41 and the movable guide 51 maintain their axially fitted state. Even in this state, the outer circumferential surface of the movable plate 53 faces the inner circumferential surface of the fixed plate 43 on both sides in the vertical direction, and the outer circumferential surface of the movable plate 54 faces the inner circumferential surface of the fixed plate 44 on both sides in the width direction. Therefore, the movable guide 51 is prevented from being displaced in the vertical direction, width direction, or around the axis, and can be displaced only in the axial direction, and the contact support 16 can also be displaced only in the axial direction without interfering with the fixed guide 41.

[0031] FIG. 15 is a cross-sectional view of the fixed guide 41 and the movable guide 51. As shown in FIG. 14(b), (a) shows a cross section C-C along the longitudinal and axial directions passing through the fixed plate 43 and the movable plate 53 on one side of the width direction, as viewed from one side of the width direction. (b) shows a cross section D-D along the width and axial directions passing through the fixed plate 44 and the movable plate 54 in FIG. 14(b), as viewed from one side of the width direction. Even when the electromagnet 17 is turned on and closed, the movable plate 53 maintains a state in which it faces the fixed plate 43 on one side of the axial direction, and the movable plate 54 maintains a state in which it faces the fixed plate 44 on one side of the axial direction.

[0032] <<Action and Effect>> Next, the main effects of the embodiment will be described. The electromagnetic contactor 11 includes a contact support 16, an electromagnet 17, a fixed plate 43, and a movable plate 53. The contact support 16 supports the movable contactor 15. The electromagnet 17 moves the contact support 16 forward and backward along the axial direction. The fixed plates 43 are fixed to the fixed side of the electromagnet 17, are arranged at the four corners of the contact support 16 when viewed from the axial direction, and protrude toward the contact support 16, each parallel to the other. The movable plates 53 are fixed to the contact support 16, protrude toward the electromagnet 17, and each face the inner circumferential surface of the fixed plate 43. Because the movable plate 53 faces the inner circumferential surface of the fixed plate 43, which is arranged parallel to the four corners of the contact support 16, rattle around the axis of the contact support 16 can be effectively suppressed. Rattle in the direction in which the fixed plate 43 and the movable plate 53 of the contact support 16 face each other, i.e., in the vertical direction, can also be effectively suppressed. Therefore, stable opening and closing operations of the contacts can be achieved. Furthermore, by using steel plates for both the fixed plate 43 and the movable plate 53, wear due to sliding can be suppressed.

[0033] The electromagnetic contactor 11 includes a fixed plate 44 and a movable plate 54. The fixed plate 44 is fixed to the fixed side of the electromagnet 17, is arranged on two sides perpendicular to the fixed plate 43 when viewed in the axial direction, protrudes toward the contact support 16, and is parallel to each other. The movable plate 54 is fixed to the contact support 16, protrudes toward the electromagnet 17, and faces the inner circumferential surface of the fixed plate 44. This effectively suppresses wobble in the direction in which the fixed plate 44 and the movable plate 54 face each other at the contact support 16, i.e., in the width direction. Furthermore, by using steel plates for the fixed plate 44 and the movable plate 54, wear due to sliding can be suppressed. The movable plates 53 and 54 are movable guides 51 formed by bending a single metal plate, thereby reducing the number of parts and improving assembly efficiency.

[0034] The electromagnet 17 is provided with a shaft 35 that is driven in the axial direction. The movable guide 51 has a through hole 55 formed on a plane perpendicular to the axial direction, into which one end of the shaft 35 fits, and is connected to the shaft 35 by plastically deforming the tip of the shaft 35 that fits into the through hole 55. This allows the movable guide 51 and the shaft 35 to be connected easily and firmly. The movable guide 51 and the shaft 35 are fixed to the contact support 16 by insert molding. This allows the movable guide 51 and the shaft 35 to be connected to the contact support 16 easily and firmly.

[0035] The movable guide 51 is bent along two parallel sides to form the movable plates 53 facing each other, and the center of the outer peripheral surface of the movable plate 53 in the direction in which the sides extend is covered by the contact support 16, and the exposed both sides face the inner peripheral surface of the fixed plate 43. This makes it possible to prevent an arc from jumping to the movable plate 53. That is, the movable contactor 15 is located on one side of the movable plate 53 in the axial direction, and there is a possibility that an arc will unintentionally jump to the center of the movable plate 53 in the direction in which the sides extend, i.e., in the width direction. Therefore, by covering the movable plate 53 in the direction in which the sides extend, i.e., the center in the width direction, with insulating resin, it is possible to prevent an arc from jumping to the movable plate 53. When viewed from the axial direction, the movable plate 53 faces away from the current-carrying direction of the movable contactor 15. This makes it possible to effectively prevent the arc from jumping to the movable plate 53.

[0036] The fixed plates 43 and 44 are fixed guides 41 formed by bending a single metal plate, thereby reducing the number of parts and improving assembly efficiency. The electromagnet 17 has an outer yoke 23 on which a protrusion 37 that protrudes toward the contact support 16 is formed on a plane perpendicular to the axial direction. The fixed guide 41 has a through hole 45 formed on a plane perpendicular to the axial direction that fits into the protrusion 37, and is fixed to the outer yoke 23 by plastically deforming the tip of the protrusion 37 that fits into the through hole 45. This makes it possible to easily and firmly fix the fixed guide 41 and the outer yoke 23 together.

[0037] Next, a comparative example will be described. The comparative example has the same configuration as the above-described embodiment except for the difference in the guide structure of the contact support, so the same reference numerals are used for common parts and detailed description will be omitted. FIG. 16 is a diagram showing a contact support 81 and an electromagnet 17 of a comparative example. Here, the contact support 81 and electromagnet 17 are shown as viewed from one side in the vertical direction, one side in the width direction, and one side in the axial direction. By providing guides 82 on two opposing sides of the contact support 81 in the vertical center, angular deviation of the contact support 81 around its axis is restricted, stabilizing the opening and closing operation. However, play is provided in the guides 82 to ensure smooth advancement and retreat of the contact support 81, and a structure in which guides 82 are provided only in the center of the two opposing sides can cause rattle around the axis, leaving room for improvement.

[0038] 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]

[0039] 11...electromagnetic contactor, 12...case, 13...cover, 14...fixed contact, 15...movable contact, 16...contact support, 17...electromagnet, 18...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... armature, 37... convex portion, 41... fixed guide, 42... bottom plate, 43... fixed plate, 44... fixed plate, 45... through hole, 46... round hole, 51... movable guide, 52... top plate, 53... movable plate, 54... movable plate, 55... through hole, 56... through hole, 57... opening, 61... cage, 62... top plate, 63... side plate, 64... through hole, 71... cover portion, 81... contact support, 82... guide

Claims

1. a contact support that supports the movable contact; an electromagnet that moves the contact support back and forth along the axial direction; a first fixing plate fixed to a fixed side of the electromagnet, disposed at four corners of the contact support when viewed from the axial direction, protruding toward the contact support and parallel to each other; a first movable plate fixed to the contact support, protruding toward the electromagnet, and facing an inner peripheral surface of the first fixed plate.

2. a second fixed plate fixed to a fixed side of the electromagnet, disposed on two sides perpendicular to the first fixed plate when viewed in the axial direction, protruding toward the contact support and parallel to each other; 2. The electromagnetic contactor according to claim 1, further comprising: second movable plates fixed to the contact support, protruding toward the electromagnet, and facing an inner peripheral surface of the second fixed plate.

3. 3. The electromagnetic contactor according to claim 2, wherein the first movable plate and the second movable plate are movable guides formed by bending a single metal plate.

4. the electromagnet comprises an axially driven shaft; The electromagnetic contactor according to claim 3, characterized in that the movable guide has a through hole formed on a plane perpendicular to the axial direction, into which one end of the shaft fits, and is connected to the shaft by plastically deforming the tip of the shaft that fits into the through hole.

5. 5. The electromagnetic contactor according to claim 4, wherein the movable guide and the shaft are fixed to the contact support by insert molding.

6. 6. The electromagnetic contactor according to claim 5, wherein the movable guide is formed by bending the first movable plate along two parallel sides so that the first movable plate faces away from each other, and the center of the outer peripheral surface of the first movable plate in the direction in which the sides extend is covered by the contact support, and the exposed both sides face the inner peripheral surface of the first fixed plate.

7. 7. The electromagnetic contactor according to claim 6, wherein the first movable plate is oriented opposite to the current-carrying direction of the movable contactor when viewed in the axial direction.

8. 3. The electromagnetic contactor according to claim 2, wherein the first fixed plate and the second fixed plate are fixed guides formed by bending a single metal plate.

9. the electromagnet includes a yoke having a convex portion formed on a plane perpendicular to the axial direction and convex toward the contact support, The electromagnetic contactor according to claim 8, characterized in that the fixed guide has a through hole formed on a plane perpendicular to the axial direction that fits into the protrusion, and is fixed to the yoke by plastically deforming the tip of the protrusion that fits into the through hole.

Images