Contact structure of direct current contactor

Abstract

The utility model relates to the field of high-voltage direct-current circuit protection, in particular to a direct-current contactor contact structure which comprises an insulating pad, a movable shaft, a contact spring, a U-shaped support and a movable contact bridge. The insulating pad and the movable shaft are integrally formed or the movable shaft is pasted and fixed on the insulating pad; the insulation pad comprises an insulation pad body and outer lug structures which are integrally formed on the two opposite sides of the insulation pad body respectively; the U-shaped support is clamped between the insulation pad body and the outer lug structure, the contact spring and the movable contact bridge are located between the U-shaped support and the insulation pad, and the contact spring abuts against the position between the movable contact bridge and the insulation pad in a compressed state and enables the movable contact bridge to abut against the U-shaped support. The utility model has the advantages of few parts, few assembly procedures, simplicity in assembly and capability of realizing automatic assembly.

Description

Technical Field

[0001] The invention relates to the field of high-voltage direct current circuit protection, and in particular to a direct current contactor contact structure. Background Art

[0002] A DC contactor is a mechanical device that uses electromagnetic principles to close and release the moving and static iron cores, thereby connecting and disconnecting the moving contact and the static contact.

[0003] Most of the existing DC contactor contact structures are direct-acting structures. For example, a DC contactor moving contact mounting structure disclosed in Chinese patent CN219738860U mainly includes a contact top rod, one end of the contact top rod is provided with a U-shaped mounting groove, both sides of the upper surface of the U-shaped mounting groove are connected with contact plates, a U-shaped slot structure is formed between the contact plate and the U-shaped mounting groove, a moving contact is installed in the U-shaped slot, both sides of the contact plate are provided with clamping holes, clamping plates are movably inserted in the two clamping holes, the clamping plates are arranged above the moving contact, a metal fixing plate is arranged on the lower surface of the moving contact, the metal fixing plate is movably connected in the U-shaped slot, a compression spring is arranged below the metal fixing plate, and the two ends of the compression spring are respectively in conflict with the lower surface of the metal fixing plate and the upper surface of the U-shaped mounting groove; a switch contact is arranged at the other end of the upper surface of the contact top rod, and a movable shaft is fixedly installed below the U-shaped mounting groove. During assembly, first assemble the contact top rod and the contact plate with the movable shaft, then install the compression spring into the U-shaped slot between the contact plates, then press the metal fixing plate onto the upper end of the compression spring, then press the moving contact onto the top of the metal fixing plate, and then directly insert the metal fixing plate into the clamping holes on both sides of the contact plate.

[0004] The contact structure of the above technical solution is relatively simple, but it still has certain defects: a large number of parts, many assembly processes, and a relatively high production cost. Summary of the invention

[0005] The object of the present invention is to provide a DC contactor contact structure with a small number of parts, simple assembly and low production cost.

[0006] To achieve the above-mentioned purpose, the technical solution provided by the present invention is a DC contactor contact structure, comprising: an insulating pad, a movable shaft, a contact spring, a U-shaped bracket and a moving contact bridge; the insulating pad and the movable shaft are integrally formed, or the movable shaft is glued and fixed on the insulating pad; the insulating pad comprises an insulating pad body and external ear structures integrally formed on opposite sides of the insulating pad body; the U-shaped bracket is clamped between the insulating pad body and the external ear structure, the contact spring and the moving contact bridge are both located between the U-shaped bracket and the insulating pad, and the contact spring abuts between the moving contact bridge and the insulating pad in a compressed state, and makes the moving contact bridge abut against the U-shaped bracket.

[0007] Preferably, the U-shaped bracket includes a bottom plate in contact with the moving contact bridge and side plates integrally formed at both ends of the bottom plate, and the free ends of the side plates are clamped between the insulating pad body and the external ear structure.

[0008] Preferably, a U-shaped slot is formed between the external ear structure and the insulating pad body, the free end of the side panel is a U-shaped plug structure, the U-shaped plug structure is inserted in the U-shaped slot, and the end of the free end of the U-shaped plug structure overlaps the insulating pad body or the external ear structure to form a limit.

[0009] Preferably, a limiting step is provided on one end of the insulating pad body or the external ear structure facing the movable axis, and the end of the free end of the U-shaped plug structure overlaps the limiting step.

[0010] Preferably, the U-shaped plug structure includes two pins integrally formed on the free end of the side panel and arranged at intervals, the two pins are parallel, or the two pins are parallel and the free ends of the two pins are bent outward to opposite sides respectively; when the U-shaped plug structure is inserted into the U-shaped slot, the free ends of the two pins are first bent and then overlapped at the limit step.

[0011] Preferably, a limiting groove is provided on one end face of the insulating pad body facing the moving contact bridge, a limiting boss is provided on the end face of the moving contact bridge corresponding to the limiting groove, one end of the contact spring is located in the limiting groove, and the other end is located on the periphery of the limiting boss.

[0012] The contact structure of the DC contactor of the present invention has a small number of parts and a small number of assembly steps, thus reducing production costs and facilitating automated assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the contact structure of the present invention.

[0014] Figure 2 It is a three-dimensional structural schematic diagram of the insulating pad and the movable shaft.

[0015] Figure 3 It is a schematic diagram of the insulating pad structure.

[0016] Figure 4 It is a schematic diagram of the U-shaped bracket structure.

[0017] Figure 5 It is a schematic diagram of the moving contact bridge structure.

[0018] Reference numerals:

[0019] Insulating pad 1, limiting step 101, insulating pad body 10, external ear structure 11, connecting piece 12, U-shaped slot 13, limiting groove 14, movable shaft 2, U-shaped bracket 3, bottom plate 31, side plate 32, pin sheet 321, notch 3211, moving contact bridge 4, limiting boss 41, contact spring 5. DETAILED DESCRIPTION

[0020] The DC contactor contact structure of the present invention comprises an insulating pad, a movable shaft, a contact spring, a U-shaped bracket and a moving contact bridge; the insulating pad and the movable shaft are integrally formed or the movable shaft is glued and fixed on the insulating pad; the opposite sides of the insulating pad body are respectively integrally formed with external ear structures, the U-shaped bracket is clamped between the insulating pad body and the external ear structure, the contact spring and the moving contact bridge are located between the U-shaped bracket and the insulating pad, and the contact spring abuts between the moving contact bridge and the insulating pad in a compressed state, and the moving contact bridge abuts against the U-shaped bracket.

[0021] With respect to the above technical solution, a preferred embodiment is now given and specifically described in conjunction with the drawings. Figures 1 to 5 .

[0022] The insulating pad 1 is an integrally molded structure made of an insulating material and is integrally molded by injection molding. The insulating pad 1 includes an insulating pad body 10 and an outer ear structure 11 located on the outer sides of the insulating pad body 10 on opposite sides. The insulating pad body 10 and the outer ear structure 11 are integrally molded through a connector 12, and a U-shaped slot 13 is formed between the insulating pad body 10 and the outer ear structure 11. One end face of the insulating pad body 10 is integrally molded with the movable shaft 2. In other embodiments, the movable shaft 2 and the insulating pad body are molded separately, and the movable shaft 2 is adhered to the insulating pad body 10. A limiting groove 14 is formed on the end face of the other end of the insulating body 10, that is, the other end opposite to the end face where the movable shaft 2 is located. Limiting steps 101 are formed on both sides of one end of the insulating pad body 10 facing the movable shaft 2, see Figure 3 a, the limiting step 101 is adjacent to the U-shaped slot 13. In other embodiments, the limiting step 101 can also be formed on the end surface of the outer ear structure 11 facing the movable shaft 2, see Figure 3 b. The outer ear structure 11 is in the shape of a baffle. The outer ear structure 11 and the limiting steps on the insulating pad body limit the position of the U-shaped bracket inserted into the U-shaped slot 13 to prevent the U-shaped bracket from coming out of the insulating pad 1.

[0023] The U-shaped bracket 3 is an integrally formed structure, and the U-shaped bracket 3 includes a bottom plate 31 and side plates 32 integrally formed with both ends of the bottom plate 31. The bottom plate 31 and the side plates 32 located at both ends of the bottom plate 31 form the U-shaped bracket 3. The bottom plate 31 is a planar structure that can fit with the dynamic contact bridge 4. The free end of the side plate 32 is a U-shaped insert structure. The U-shaped insert structure includes two pin pieces 321 integrally formed on the free end of the side plate 32 and spaced apart. The two pin pieces 321 are arranged in parallel, and the free ends of the two pin pieces are bent toward the outside of the opposite sides, respectively, see Figure 4 a. A notch 3211 for the free end of the pin piece to bend again is provided at the bending portion of the pin piece 321. In other embodiments, two pin pieces 321 are arranged in parallel, and a notch 3211 for the free end of the pin piece to bend is provided near the free ends of the two pin pieces 321.

[0024] The side plates 32 of the U-shaped bracket 3 are inserted into the U-shaped slots 13 on both sides of the insulating pad body 10, and the connector 12 at the U-shaped slots 13 is located in the U-shaped groove of the U-shaped bracket 3. The free ends of the two pins 321 of the U-shaped bracket 3 are bent toward the side of the limiting step 101, and the free ends of the bent pins 321 overlap the limiting step 101. Under the elastic force of the contact spring, at the same time, the free ends of the pins on the U-shaped bracket overlap (or hook) at the limiting step, for example, the hook is at the end face of the insulating pad on the limiting step close to the movable axis (such as Figure 3 101 in the middle solution), or the hook is at the end surface of the outer ear structure near the movable axis at the limiting step (such as Figure 3 In the middle scheme 101), the U-shaped bracket 3 is limited in position by the outer ear structure and the limiting step to prevent it from detaching from the insulating pad. In this embodiment, the U-shaped insert structure is set at the side plate of the U-shaped bracket. When the free end of the pin piece of the U-shaped bracket is bent and installed (or hooked) on the limiting step of the insulating pad, it cooperates with the contact spring and the outer ear structure to ensure that the U-shaped bracket is limited in three degrees of freedom in the spatial direction, which is safer and more reliable.

[0025] The moving contact bridge 4 is located between the U-shaped bracket 3 and the insulating pad body 10. On the end face of the moving contact bridge 4 facing the insulating pad 1, a limiting boss 41 is formed at the position of the limiting groove 14 on the insulating pad body 10, and the limiting boss 41 protrudes from the end face of the moving contact bridge 4. A contact spring 5 is abutted between the moving contact bridge 4 and the insulating pad body 10. One end of the contact spring 5 abuts against the limiting groove 14 on the insulating pad body 10, and the other end abuts against the end face of the moving contact bridge 4 on the outer periphery of the limiting boss 41 of the moving contact bridge 4, so that the moving contact bridge 4 contacts the bottom plate of the U-shaped bracket 3, and the two ends of the moving contact bridge 4 are located outside the bottom plate of the U-shaped bracket 3.

[0026] During assembly, one end of the contact spring 5 is inserted into the limiting groove 14 of the insulating pad 1, and then the moving contact bridge 4 is placed on the other end of the contact spring 5, and the limiting boss 41 of the moving contact bridge 4 is located in the spring coil of the contact spring 5, and then the U-shaped bracket 3 is pressed onto the moving contact bridge 4, and the side plate 32 of the U-shaped bracket 3 is inserted into the U-shaped slot of the insulating pad 1, and the free end of the pin sheet is bent so that the bent free end of the pin sheet overlaps the limiting step of the insulating pad 1 to complete the assembly.

[0027] The contact structure of the present invention has fewer parts, is simple to assemble, and is easy to realize automated assembly.

Claims

1. A DC contactor contact structure, characterized in that: include: Insulating pad, movable shaft, contact spring, U-shaped bracket and moving contact bridge; the insulating pad and the movable shaft are integrally formed, or the movable shaft is glued and fixed on the insulating pad; The insulating pad includes an insulating pad body and external ear structures integrally formed on opposite sides of the insulating pad body; the U-shaped bracket is clamped between the insulating pad body and the external ear structure, the contact spring and the moving contact bridge are both located between the U-shaped bracket and the insulating pad, and the contact spring abuts between the moving contact bridge and the insulating pad in a compressed state, and makes the moving contact bridge abut against the U-shaped bracket.

2. The DC contactor contact structure according to claim 1, characterized in that: The U-shaped bracket includes a bottom plate in contact with the moving contact bridge and side plates integrally formed at both ends of the bottom plate, and the free ends of the side plates are clamped between the insulating pad body and the external ear structure.

3. The DC contactor contact structure according to claim 2, characterized in that: A U-shaped slot is formed between the external ear structure and the insulating pad body, the free end of the side panel is a U-shaped plug structure, the U-shaped plug structure is inserted in the U-shaped slot, and the end of the free end of the U-shaped plug structure overlaps the insulating pad body or the external ear structure to form a limit.

4. The DC contactor contact structure according to claim 3, characterized in that: A limiting step is provided at one end of the insulating pad body or the external ear structure facing the movable shaft, and the end of the free end of the U-shaped plug structure is overlapped at the limiting step.

5. The DC contactor contact structure according to claim 4, characterized in that: The U-shaped plug structure includes two pins integrally formed on the free end of the side plate and arranged at intervals, the two pins are parallel, or the two pins are parallel and the free ends of the two pins are bent outward to opposite sides in a bent shape; when the U-shaped plug structure is inserted into the U-shaped slot, the bent free ends of the two pins are first bent and then overlapped at the limiting step.

6. The DC contactor contact structure according to claim 1, characterized in that: A limiting groove is provided on one end surface of the insulating pad body facing the moving contact bridge, a limiting boss is provided on the end surface of the moving contact bridge corresponding to the limiting groove, one end of the contact spring is located in the limiting groove, and the other end is located on the periphery of the limiting boss.

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