Electromagnetic contactor

Abstract

To provide an electromagnetic contactor that can reliably position a fixed contact with high precision when fastening it to an external terminal with a screw and can reliably prevent the fixed contact from rotating.SOLUTION: An electromagnetic contactor includes a synthetic resin housing 13 that houses a pair of fixed contacts 31 and a movable contact 32, and an electromagnet unit 22. The pair of fixed contacts are integrated into a housing with screw holes 35 exposed to the outside, into which external terminals 60, 61 are screwed. Protrusions 36 are formed on the pair of fixed contacts, and recesses 39 that fit into the protrusions are formed in the housing.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] In the electromagnetic contactor of Patent Document 1, when the fixed contactor arranged in the housing is screwed to the external terminal, a hexagonal screw receiving member that screws onto the fixed contactor is provided inside the housing, thereby preventing the fixed contactor from rotating relative to the housing.

[0003] Furthermore, in the electromagnetic contactor of Patent Document 2, when the housing and fixed contact are screwed together, a nut that screws onto the male screw is stored in a recessed accommodating portion provided in the housing, and multiple protrusions provided in the recessed accommodating portion press the nut, preventing the center of the male screw from shifting. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2021-48026 A (Figure 7) [Patent Document 2] Japanese Patent Application Publication No. 2023-51349 Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, a screw receiving member needs to be placed inside the housing to prevent the fixed contact from rotating when it is fastened to the external terminal with a screw, which increases the number of parts and increases manufacturing costs.

[0006] Patent Document 2 also requires a complex manufacturing process in which multiple protrusions are provided in the receiving recess in order to position the fixed contact in the housing with high precision, which creates a problem in terms of manufacturing cost.

[0007] The present invention aims to provide an electromagnetic contactor that can reliably position a fixed contactor with high precision when screwing it to an external terminal and prevent the fixed contactor from rotating, while reducing the number of parts, eliminating complex manufacturing processes, and reducing manufacturing costs. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the electromagnetic contactor of the present invention comprises a pair of fixed contacts having fixed contacts, a movable contactor having a pair of movable contacts that can be attached to and detached from the fixed contacts of the pair of fixed contacts, an electromagnet unit that drives the movable contactor, and a synthetic resin housing that houses the pair of fixed contacts, the movable contactor, and the electromagnet unit, and the pair of fixed contacts are integrated into the housing with screw holes that are exposed to the outside and are fastened to external terminals by screws, and a protrusion is formed on one of the integrated pair of fixed contacts and the housing, and a recess that fits into the protrusion is formed on the other of the pair of fixed contacts and the housing. [Effects of the Invention]

[0009] According to the electromagnetic contactor of the present invention, it is possible to reduce the number of parts, eliminate complex manufacturing processes, and reduce manufacturing costs, while also ensuring high-precision positioning of the fixed contact when screwing it to the external terminal and preventing the fixed contact from rotating. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing an electromagnetic contactor according to the present invention; [Figure 2] 1 is a cross-sectional view showing the internal structure of an electromagnetic contactor according to the present invention. [Figure 3] 1A and 1B are diagrams showing fixed contacts constituting an electromagnetic contactor according to the present invention; [Figure 4] 1 is a schematic diagram showing a fixed contact and a housing integrated by insert molding according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0011] Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are designated by the same 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.

[0012] 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.

[0013] In the following description, the three mutually orthogonal directions will be referred to as the vertical direction, the width direction, and the depth direction for the sake of convenience.

[0014] 1 includes a sealed container 12 made of an electrically insulating resin, and the sealed container 12 includes a capsule case 13 and a capsule cover 14. Here, the housing described in the present invention corresponds to the capsule case 13 (sealed container 12).

[0015] The capsule case 13 has a generally rectangular box shape that is closed on both vertical sides, both width sides, and the front side in the depth direction, and is open on the rear side in the depth direction.

[0016] The capsule cover 14 has a generally rectangular box shape with both vertical and widthwise sides and the rear side closed, and an open front side in the depth direction. The capsule case 13 and the capsule cover 14 fit together at their open ends and are fastened together by tapping screws (not shown).

[0017] 2, sealed container 12 accommodates contact portion 21 and electromagnet unit 22. Inside sealed container 12, contact portion 21 is arranged in arc extinguishing chamber 23 on the front side in the depth direction, and electromagnet unit 22, which switches contact portion 21 between open and closed, is arranged on the back side in the depth direction.

[0018] A metal pipe 15 is provided in the capsule cover 14, penetrating one of the side walls in the vertical direction. The pipe 15 serves as an inlet for charging pressurized interrupting gas such as hydrogen or nitrogen, connecting the inside and outside, but is sealed by being crushed at the tip end after charging.

[0019] The entire outer periphery of the sealed container 12 is gas-barrier coated with a laminated film of clay crystals.

[0020] The contact portion 21 includes a pair of fixed contacts 31 and a movable contact 32 .

[0021] The pair of fixed contacts 31 are of an electrode type formed from a conductive metal, and are arranged at a distance in the vertical direction.

[0022] As shown in Figure 3(a), the fixed contact 31 is a member including a cylindrical portion 33 and a disk-shaped flange portion 34 formed integrally with one end of the cylindrical portion 33 and having a larger diameter than the cylindrical portion 33, and a screw hole 35 is formed from the flange portion 34 to the inside of the cylindrical portion 33. As shown in Figures 3(b) and 3(c), three protrusions 36 are formed at intervals in the circumferential direction on the outer periphery of the cylindrical portion 33 close to the flange portion 34.

[0023] The fixed contact 31 is integrated into the capsule case 13 by insert molding, penetrating through the ceiling. Specifically, micron-sized irregularities are formed on the surface of the fixed contact 31 by chemical etching, and then insert molding is performed. This allows molten resin to penetrate the irregularities and solidify, bonding the metal and resin at the interface level, creating a complex bond due to the labyrinth effect and preventing leakage of gas molecules such as hydrogen and nitrogen. An example of metal surface treatment technology is "AMALPHA" (registered trademark) by MEC Corporation.

[0024] 2, the fixed contact 31 has a front side in the depth direction exposed to the outside of the sealed container 12 and a rear side in the depth direction disposed inside the sealed container 12, with a fixed contact 37 formed on the end face on the rear side. A plate-shaped insulating barrier 16 is formed on the upper surface of the capsule case 13 so as to surround the flange 34 of the fixed contact 31.

[0025] Here, when the fixed contact 31 is integrated into the capsule case 13 by insert molding, three recesses 39 are formed in the capsule case 13 while fitting into three protrusions 36 protruding from the outer periphery of the cylindrical portion 33, as shown in Figure 4.

[0026] The movable contactor 32 is made of a conductive metal, extends in the vertical direction, and is formed in a flat plate shape along the vertical and width directions, and is disposed further back in the depth direction than the pair of fixed contactors 31. The movable contactor 32 has movable contacts 38 formed on both vertical ends of its front surface in the depth direction. When the movable contactor 32 is displaced toward the back in the depth direction, the movable contacts 38 are separated from the fixed contacts 37, and when the movable contactor 32 is displaced toward the front in the depth direction, the movable contacts 38 are brought into contact with the fixed contacts 37. The contact portion 21 is composed of the fixed contacts 37 and the movable contacts 38.

[0027] The movable contactor 32 is supported by a contact support 41. The contact support 41 includes a base 42, a pressing member 43 fixed to the front side of the base 42 in the depth direction, and a contact spring 44 interposed between the base 42 and the movable contactor 32 and biasing the movable contactor 32 toward the front side in the depth direction.

[0028] The electromagnet unit 22 is housed at the rear side in the depth direction of the sealed container 12. The electromagnet unit 22 includes a spool 51 having a coil 65 wound around a winding shaft 64, a sliding collar 52 inserted into and fitted with the inside of the winding shaft 64 from the rear side in the depth direction, and a movable plunger 53 which is a movable iron core connected to the base 42 of the contact support 41. The electromagnet unit 22 also includes an armature 54 fixed to the end of the movable plunger 53 on the rear side in the depth direction, a pair of yokes 55, a plunger ring 56, a back spring 57 that urges the plunger ring 56 toward the front side in the depth direction, a permanent magnet 58 in contact with the lower piece on the rear side in the depth direction of the yoke 55, and an auxiliary yoke 59. In this electromagnet unit 22, when the coil 65 is not energized and is in a non-excited state, the magnetic force of the permanent magnet 58 and the repulsive force of the back spring 57 displace the movable plunger 53 toward the rear in the depth direction, and the armature 54 is attracted to the auxiliary yoke 59. At this time, the contact support 41 also displaces toward the rear in the depth direction, so that the pair of fixed contacts 37 and the movable contact 38 are separated from each other, and the contact portion 21 opens (disconnected state).

[0029] On the other hand, when the coil 65 is energized and excited, the armature 54 is attracted to the lower part of the yoke 55, and the movable plunger 53 is displaced toward the front in the depth direction against the magnetic force of the permanent magnet 58 and the repulsive force of the back spring 57. At this time, the contact support 41 also displaces toward the front in the depth direction, so that the movable contact 38 comes into contact with each of the pair of fixed contacts 37, and the contact portion 21 is closed (closed state).

[0030] As shown in FIG. 2, in the electromagnetic contactor 11 having the above configuration, a primary side external terminal 60 is screwed to one of a pair of fixed contacts 31, and a secondary side external terminal 61 is screwed to the other of the pair of fixed contacts 31.

[0031] That is, one fixed contactor 31 and the external terminal 60 are fastened together by inserting the threaded portion of a fastening screw 62 into the through hole 60a of the external terminal 60 and screwing the threaded portion into the threaded hole 35 of one fixed contactor 31 to fasten the fastening screw 62. Similarly, the threaded portion of a fastening screw 63 is inserted into the through hole 61a of the external terminal 61 and screwing the threaded portion into the threaded hole 35 of the other fixed contactor 31 to fasten the fastening screw 63.

[0032] When the threaded portions of the fastening screws 62, 63 are screwed into the threaded holes 35 of the pair of fixed contacts 31, a rotational force F shown in Fig. 4 is transmitted to the fixed contacts 31 integrated inside the capsule case 13. In response to the rotational force F transmitted to the fixed contacts 31, the three recesses 39 formed in the capsule case 13 act as a reaction force N on the protrusions 36 protruding from the cylindrical portions 33 of the fixed contacts 31, thereby preventing the fixed contacts 31 from rotating due to the rotational force F.

[0033] Furthermore, when the threaded portion of the fastening screw 62 (or fastening screw 63) is screwed into the threaded hole 35 of the fixed contact 31, an external force may act in a direction that causes the axis of the fixed contact 31 to become eccentric. Even if such an external force acts, the three recesses 39 formed on the capsule case 13 restrain the radial movement of the three protrusions 36 formed on the cylindrical portion 33. This allows the fixed contact 31 to be integrated with the capsule case 13 while being positioned with high precision.

[0034] Therefore, the electromagnetic contactor 11 of this embodiment has a structure in which three recesses 39 provided on the capsule case 13 are fitted into three protrusions 36 provided on the cylindrical portion 33 of the fixed contactor 31, which ensures high-precision positioning of the fixed contactor 31 and prevention of rotation of the fixed contactor 31 when screwing the external terminals 60, 61 to the pair of fixed contactors 31.

[0035] In addition, the structure of this embodiment, in which the recess 39 provided in the capsule case 13 and the protrusion 36 provided on the cylindrical portion 33 of the fixed contact 31 are each fitted together, has a small number of parts and is a simple structure that does not require complex manufacturing processes, thereby enabling reduction in manufacturing costs.

[0036] Furthermore, the pair of fixed contacts 31 are surface treated by chemical etching and are integrated into the capsule case 13 by insert molding, and the metal and resin are joined at the interface level to form a complex joint using the labyrinth effect, which reliably prevents leakage of interrupter gases such as hydrogen and nitrogen.

[0037] In this embodiment, a structure is shown in which a protrusion 36 is formed on the outer periphery of the cylindrical portion 33 of the fixed contactor 31 and a recess 39 is formed in the capsule case 13 to fit into the protrusion 36, but the same effect can be obtained by forming a recess in the fixed contactor 31 and a protrusion that fits into the recess in the capsule case 13.

[0038] Furthermore, instead of forming only one of the same type of protrusions and recesses on the cylindrical portion 33 of the fixed contact 31, the same effect can be obtained by forming protrusions in, for example, two of the three locations and a recess in the remaining location.

[0039] In addition, in this embodiment, the protrusions 36 and recesses 39 are formed in three places, but the number is not limited to three. Furthermore, the shape of the protrusions is not limited to the rectangular parallelepiped shown in FIG. [Explanation of symbols]

[0040] 11 Magnetic contactor 12. Airtight containers 13 Capsule Case 14 Capsule Cover 15 Pipe 16 Isolation Barrier 21 Contact point 22 Electromagnet unit 23 Arc Extinguishing Room 31 Fixed contact 32 Movable contact 33 Cylindrical part 34 Tsuba 35 screw holes 36 Protrusion 37 Fixed contacts 38 Movable contact 39 Recess 41 Contact support 42 Base 43 Holding member 44 Contact spring 51 spool 52 Sliding collar 53 Movable plunger 54 Armature 55 York 57 Back spring 58 Permanent Magnets 59 Auxiliary yoke 60,61 External terminals 62,63 Fastening screws 64 Spool 65 coils

Claims

1. a pair of fixed contacts having fixed contacts; a movable contactor having a pair of movable contacts that can be brought into contact with and separated from the fixed contacts of the pair of fixed contacts; an electromagnet unit that drives the movable contact; a housing made of synthetic resin that houses the pair of fixed contacts, the movable contact, and the electromagnet unit, the pair of fixed contacts are integrated with the housing with screw holes to be screwed to external terminals exposed to the outside, An electromagnetic contactor characterized in that a protrusion is formed on one of the pair of fixed contacts and the housing, which are integrated together, and a recess that fits into the protrusion is formed on the other of the pair of fixed contacts and the housing.

2. a pair of fixed contacts having fixed contacts; a movable contactor having a pair of movable contacts that can be brought into contact with and separated from the fixed contacts of the pair of fixed contacts; an electromagnet unit that drives the movable contact; a housing made of synthetic resin that houses the pair of fixed contacts, the movable contact, and the electromagnet unit, the pair of fixed contacts are integrated with the housing with screw holes to be screwed to external terminals exposed to the outside, An electromagnetic contactor characterized in that one of the pair of fixed contacts and the housing, which are integrated, has two or more first protrusions and first recesses formed thereon, and the other of the pair of fixed contacts and the housing has two or more second recesses and second protrusions formed thereon that fit into the first protrusions and first recesses.

3. The housing is filled with an arc-extinguishing gas, 3. The electromagnetic contactor according to claim 1, wherein the pair of fixed contacts are integrated with the housing by insert molding.

4. 4. The electromagnetic contactor according to claim 3, wherein the pair of fixed contacts are subjected to a surface treatment by chemical etching.

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