Electromagnetic contactor

Abstract

To provide an electromagnetic contactor capable of reducing assembly cost by easily attaching a winding terminal to a spool.SOLUTION: The electromagnetic relay includes a contact 18 arranged on one side in an axial direction, and an electromagnet 17 arranged on the other side in the axial direction and opening and closing the contact along the axial direction. A spool 21 in which a pair of flange portions 45,46 and ribs 47 and 48 facing each other in a width direction when viewed from an axial direction are formed on the other side in the axial direction of a winding shaft, and a binding terminal 42,43 having a binding portion 63 for binding and connecting an end portion of a winding and a power supply connection portion 61 for connecting a power supply terminal are provided, and press-fitting portions 40 and 41 for press-fitting the binding terminal are provided outside the pair of flange portions and the ribs.SELECTED DRAWING: Figure 8

Description

[Technical Field]

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

[0002] For example, in the electromagnetic contactor described in Patent Document 1, a binding terminal that connects the end of the coil to an external terminal is fixed to a spool on which the coil is wound. The binding terminal is a flat member that has a binding portion that binds and connects the end of the coil, and an external terminal that connects the external terminal. This flat binding terminal is press-fitted into a press-fit groove provided in the spool, and the coil binding portion and the external terminal are bent and deformed, thereby completing the assembly of the binding terminal to the spool. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2011 / 115054 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the electromagnetic contactor of Patent Document 1 requires work such as bending and raising when assembling the binding terminal to the spool, which means there is room for improvement in the number of assembly steps. Therefore, the present invention has been made in consideration of the above circumstances, and aims to provide an electromagnetic contactor that can reduce assembly costs by simply attaching a binding terminal to a spool. [Means for solving the problem]

[0005] In order to achieve the above object, an electromagnetic contactor according to one embodiment of the present invention comprises a contact arranged on one side in the axial direction, and an electromagnet arranged on the other side in the axial direction and opening and closing the contact along the axial direction, the electromagnet having a coil formed by winding a wire around a cylindrical winding shaft, a spool on the other side of the axial direction of the winding shaft having a pair of flanges and ribs that face each other in the width direction when viewed from the axial direction, and a binding terminal having a binding portion that binds and connects the end of the winding and a power connection portion that connects to a power terminal, and a press-fit portion into which the binding terminal is press-fitted is provided on the outside of the pair of flanges and ribs. [Effects of the Invention]

[0006] According to the electromagnetic contactor of the present invention, the connection terminal can be easily attached to the spool, thereby reducing assembly costs. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a perspective view showing the appearance of an electromagnetic contactor according to an embodiment of the present invention; [Figure 2] FIG. 2 is a cross-sectional view of an electromagnetic contactor according to an embodiment. [Figure 3] 1 is a diagram showing a spool around which a coil constituting an electromagnetic contactor is wound, and a binding terminal attached to the spool. FIG. [Figure 4] 1 shows a press-fit portion provided on the spool. [Figure 5] FIG. 2 is a diagram showing the structure of a binding terminal. [Figure 6] 10 is a diagram showing a state in which a power terminal is connected to a power connection portion of a binding terminal via a power cable. FIG. [Figure 7] 10 is a diagram showing a state in which a binding terminal is press-fitted into a press-fit portion provided on a spool. FIG. [Figure 8] 10 is a diagram showing the state in which the end of the coil is fastened to the fastening portion of the fastening terminal press-fitted into the press-fit portion of the spool. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, identical or similar parts are designated by identical or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between thickness and planar dimensions, the thickness ratio of each layer, etc., may differ from the actual ones. Therefore, specific thicknesses and dimensions should be determined with reference to the following description. Furthermore, it goes without saying that the drawings may include parts with different dimensional relationships and ratios. Furthermore, the embodiments shown below are merely examples of devices and methods for embodying the technical concept of the present invention, and the technical concept of the present invention does not limit the materials, shapes, structures, arrangements, etc. of the components to those described below. The technical concept of the present invention can be modified in various ways within the technical scope defined by the claims.

[0009] 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. The electromagnetic contactor 11 includes a case 12 and a cover 13 as sealed containers. The case 12 is made of insulating resin and is formed in the shape of a deep container with both vertical sides, both width sides, and one axial side closed and the other axial side open. The cover 13 is made of insulating resin and is formed in the shape of a shallow container with both vertical sides, both width sides, and the other axial side closed and one axial side open.

[0010] Pressurized arc-extinguishing gas, such as nitrogen, is sealed inside the case 12 and cover 13. The open openings of the case 12 and cover 13 are joined together using an epoxy adhesive. 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, to create a labyrinth effect, preventing the permeation of gas molecules, such as 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 onto the case 12 and cover 13 in mist form, 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. The electromagnetic contactor 11 includes a pair of fixed contacts 14 , a movable contact 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 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 inject 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. The electromagnet 17 is disposed 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, a bottom yoke 24, a permanent magnet 25, an auxiliary yoke 26, and a back spring 27.

[0014] The spool 21 is made of insulating resin, and has a cylindrical winding shaft 31 extending in the axial direction, around which a wire is wound to form a coil 32. A cylindrical sliding collar 34 is fitted inside the winding shaft 31. The plunger 22 is a cylindrical movable iron core extending in the axial direction, and is inserted into a sliding collar 34 in a state in which it can move back and forth in the axial direction. 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. The tip side of the outer yoke 23 is a pair of side plates extending in the width and axial directions that face each other in the longitudinal direction. A shaft 35 is inserted through a round hole that penetrates in the axial direction in the flat plates of the outer yoke 23 extending 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] Here, reference numeral 37 in FIG. 2 denotes a power supply case formed in a part of the case 12, and this power supply case 37 houses a pair of power supply terminals 38a, 38b. Next, Figures 3(a) and (b) show a spool 21 on which a coil 32 is wound around a winding shaft 31, and first and second connecting terminals 42 and 43 that are press-fitted into first and second press-fitting portions 40 and 41 formed on the spool 21 and connect the ends of the coil 32 to a pair of power terminals 38a and 38b. A flange 44 is formed at the other axial end of the winding shaft 31 of the spool 21. The flange 44 is formed as a plate extending in the vertical and width directions and is substantially rectangular when viewed axially. A pair of flanges 45, 46 facing each other in the width direction are formed continuously at the end of the flange 44. The pair of flanges 45, 46 extend vertically and are formed as plates extending in the vertical and axial directions. Ribs 47, 48 are formed continuously at the other axial ends of the pair of flanges 45, 46. The ribs 47, 48 extend vertically and are formed as plate-like members extending in the vertical and width directions.

[0018] 4 shows the first press-fit portion 40 formed in the spool 21. A longitudinal protrusion 50 extending linearly in the longitudinal direction parallel to one of the ribs 47 is formed on the outer wall of one of the flange portions 45, and a first axial protrusion 51 extending continuously from one longitudinal side end of the longitudinal protrusion 50 in one axial direction. A second axial protrusion 52 extending axially in parallel to the first axial protrusion 51 is formed on the outer wall of the flange portion 45. A first recess 52 extends linearly in the longitudinal direction between the longitudinal protrusion 50 and the rib 47, and a second recess 53 extends linearly in the axial direction from one longitudinal end of the first recess 52 in one longitudinal direction between the first axial protrusion 51 and the second axial protrusion 52. These first recess 52 and second recess 53 constitute the first press-fit portion 40.

[0019] 5(a) and (b) show the first connecting terminal 42. The first connecting terminal 42 is a long, conductive metal plate, and includes a long portion 60, a plate-like power supply connection portion 61 formed at one longitudinal end of the long portion 60, and a short portion 62 formed by bending the other longitudinal end of the long portion 60 at a right angle. Here, the L-shaped main body described in the present invention corresponds to the long portion 60 and the short portion 62. A tying portion 63 is formed on the other longitudinal end of the long portion 60, closer to the short portion 49, protruding from one end in the width direction. The tying portion 63 is bent in the direction in which the short portion 62 extends. The long portion 60 and the short portion 62 are also formed with engagement protrusions 64 protruding in the thickness direction. As shown in FIG. 6 , one end of a power cable 65 is connected to the power connection portion 61 of the first tying terminal 42. The other end of the power cable 65 is connected to the power terminal 38a housed in the power supply case 37 described above.

[0020] 7 shows the first reel terminal 42, with a power cable 65 connected to the power connection portion 61, press-fitted into the first press-fit portion 40. The long portion 60 and engaging protrusion 64 of the first reel terminal 42 are press-fitted into the first recess 52 of the first press-fit portion 40 while engaging with the inner surface of the first recess 52. The short portion 62 and engaging protrusion 64 of the first reel terminal 42 are press-fitted into the second recess 53 of the first press-fit portion 40 while engaging with the inner surface of the second recess 53.

[0021] 8 shows the process of tying the end of the coil 32 (end of the winding) formed on the winding shaft 31 of the spool 21 to the tying portion 63 of the first tying terminal 42. The coil end (end of the winding) 66 protruding from the lower end of the coil 32 is gradually tying to the tying portion 63 of the first tying terminal 42 press-fitted into the first press-fit portion 40. After the tying of the coil end 66 is completed, the tying portion 63 is deformed in the direction of the dashed arrow in FIG. 8, approaching the coil 32, thereby relieving the tension on the coil end 66. Here, Figure 4 explains the structure of the first press-fit portion 40, Figures 5 and 6 explain the structure of the first hook-up terminal 42, and Figures 7 and 8 explain the structure for press-fitting the first hook-up terminal 42 into the first press-fit portion 40. However, since the structure of the second press-fit portion 41 is also approximately the same as that of the first press-fit portion 40, and the structure of the second hook-up terminal 43 is also approximately the same as that of the first hook-up terminal 42, explanation of the specific configurations of the second press-fit portion 41 and the second hook-up terminal 43 will be omitted.

[0022] In the electromagnetic contactor 11 configured as described above, when the coil 32 is not energized and is in a non-excited 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 one side of the permanent magnet 25 through the bottom yoke 24, outer yoke 23, plunger 22, armature 36, and auxiliary yoke 26 in this order to the other side of the permanent magnet 25. This closed-loop magnetic circuit attracts the armature 36 to one side of the auxiliary yoke 26. Thus, when the plunger 22 is displaced in the other axial direction, the contact 18 opens via the contact support 16, resulting in a released state. At this time, the armature 36 is separated from the bottom yoke 24.

[0023] When the coil 32 is energized and excited, the magnetic force of the coil 32 attracts the armature 36 to the other 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 plunger 22, through the armature 36 and the bottom yoke 24, and then to the outer yoke 23. This closed-loop magnetic circuit attracts the armature 36 to the other surface of the bottom yoke 24. When the plunger 22 is displaced to one side in the axial direction, the contact 18 closes via the contact support 16, establishing a closed state. At this time, the armature 36 is spaced apart from the auxiliary yoke 26. Furthermore, if a large current flows when the contact 18 is in the closed state, an arc occurs between the fixed contact of the fixed contactor 14 and the movable contact of the movable contactor 15, and the arc is cooled and extinguished by the arc-extinguishing gas sealed in the sealed container.

[0024] Next, the main effects of the embodiment will be described. The spool 21 of the electromagnet 17 has a coil 32 wound around a cylindrical winding shaft 31. A pair of flanges 45, 46 facing each other in the width direction are formed at the other axial end of the winding shaft 31, and a pair of ribs 47, 48 perpendicular to the axial direction are formed at the other axial ends of the pair of flanges 45, 46. First and second press-fit portions 40, 41 are formed on the outer walls of the pair of flanges 45, 46 and the pair of ribs 47, 48. First and second connection terminals 42, 43 that connect the coil 32 to an external power source are press-fitted into these first and second press-fit portions 40, 41. In this way, the first and second connection terminals 42, 43 can be easily assembled by press-fitting into the first and second press-fit portions 40, 41 of the spool 21, thereby reducing the assembly cost of the electromagnet 17.

[0025] The first and second press-fit portions 40, 41 formed on the spool 21 are composed of a first recess 52 extending vertically and a second recess 53 extending axially, perpendicular to the vertical direction, and the first and second hook-up terminals 42, 43 are formed in an L-shape that can be inserted into the first recess 52 and the second recess 53, and are provided with engaging protrusions 64 that engage with the inner surfaces of the first recess 52 and the second recess 53 to restrict vertical and axial movement of the first and second hook-up terminals 42, 43. As a result, even if vibration is input from the outside, the first and second hook-up terminals 42, 43 attached to the spool 21 are prevented from moving axially and vertically, and there is no risk of the first and second hook-up terminals 42, 43 coming out of the first and second press-fit portions 40, 41.

[0026] Furthermore, when the temperatures of the fixed contact 14 and the movable contact 15 of the contact 18 rise due to the generation of an arc, the fixed contact and the movable contact melt, generating metal vapor. If this metal vapor flows into the electromagnet 17 and exposes the first and second connecting terminals 42, 43, they may be thermally affected. However, in this embodiment, the first and second connecting terminals 42, 43 are located on the other flange 44 side of the spool 21 in the axial direction, away from the contact 18, so they are not directly exposed to the metal vapor and are not susceptible to thermal effects. [Explanation of symbols]

[0027] 11 Magnetic contactor 12 cases 13 Cover 14 Fixed contact 15 Moving contact 16 Contact support 17 Electromagnet 18 Contacts 19 Contact spring 21 spools 22 Plunger 23 Outer Yoke 24 Bottom Yoke 25 Permanent Magnets 26 Auxiliary yoke 27 Back spring 31 Reel 32 coils 34 Sliding collar 35 shaft 36 Armature 37 Power Supply Case 38a,38b Power terminal 40 First press-fit section 41 Second press-fit section 42 First connection terminal 43 Second connection terminal 44 flange 45,46 Tsuba section 47, 48 Ribs 50 longitudinal protrusion 51 1st axial protrusion 52 2nd axial protrusion 52 First recess 53 Second recess 60 Long section 61 Power connection 62 Short section 63 Tangled 64 Engagement protrusion 65 Power Cable 66 Coil end

Claims

1. a contact point disposed on one side in the axial direction; an electromagnet disposed on the other side of the axial direction for opening and closing the contacts along the axial direction, The electromagnet is a spool having a coil formed by winding a wire around a cylindrical winding shaft, and a pair of flanges and a rib formed on the other axial side of the winding shaft so as to face each other in the width direction when viewed from the axial direction; a tying terminal having a tying portion for tying and connecting the end of the winding and a power supply connecting portion for connecting a power supply terminal, An electromagnetic contactor characterized in that a press-fit portion into which the binding terminal is press-fit is provided on the outside of the pair of flange portions and rib.

2. the press-fit portion is formed by the pair of ribs and protrusions projecting from outer walls of the pair of flange portions, and is formed by a first recess extending linearly in a vertical direction perpendicular to the axial direction, and a second recess extending axially continuously from one end of the first recess in the vertical direction, 2. The electromagnetic contactor according to claim 1, wherein the binding terminal is shaped to be press-fitted into the first recess and the second recess.

3. The electromagnetic contactor according to claim 2, characterized in that the binding terminal comprises an L-shaped main body portion that can be inserted into the first recess and the second recess, and an engaging protrusion that protrudes from a part of the main body portion and engages with the inner surfaces of the first recess and the second recess.

4. a sealed container that hermetically houses the contacts and the electromagnet in the same space, 4. The electromagnetic contactor according to claim 1, wherein the sealed container is filled with an arc-extinguishing gas.

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