Contact knife structure for fuse link

Abstract

A contact knife structure for a fuse link comprises a conductive knife row and a welding piece, the knife row is vertically inserted on the welding piece, and a high-temperature-resistant injection molding structure wraps the periphery of one end, connected with the welding piece, of the knife row in inserted connection with the welding piece. Compared with an existing contact knife structure, the weight is light, and the effective welding area of the melt and the filling number of arc extinguishing media are not affected.

Description

Technical Field

[0001] This invention relates to the field of circuit protection, specifically to the contact structure for fuses used in circuit protection. Background Technology

[0002] A fuse contactor typically consists of a blade array and a welding plate. The blade array is used for connection and installation with external circuits, while the welding plate is used to weld the fusible element from the fuse to the welding plate, serving to fix the fusible element and conduct electricity. Existing traditional fuse contactor structures mainly include integrated, welded, or riveted structures. Integrated contactors integrate the blade array and welding plate into a single unit, resulting in complex manufacturing processes, low material utilization, heavy weight, and high cost. For example, the contactor structure disclosed in Chinese patent ZL2018307569262 has a complex structure and molding process. Welded contactors directly weld the blade array to the welding plate. To ensure a reliable connection between the blade array and the welding plate, welding grooves are generally provided on the welding plate, which affects the effective welding position of the fusible element. Riveted contactor structures suffer from problems such as a small effective welding area, limited number of effective fusible element pieces, and less arc-extinguishing medium for the same volume. All of these existing contactor structures generally suffer from high cost, difficult molding, and heavy weight. Summary of the Invention

[0003] The purpose of this invention is to connect the blade pack and the welding piece by inserting and then injection molding, which provides connection strength while ensuring the welding area of ​​the welding piece, making the contact blade structure processing technology simple and low cost.

[0004] To achieve the above objectives, the present invention provides a contact knife structure for a fuse element, comprising a conductive knife bar and a welding piece, wherein the knife bar is vertically inserted into the welding piece, and a high-temperature resistant injection-molded structure is wrapped around the connecting end of the knife bar and the welding piece.

[0005] Preferably, the thickness of the injection-molded structure is greater than the thickness of the welded sheet, and the portion of the cutter bar adjacent to the surface of the welded sheet is located within the injection-molded structure.

[0006] Preferably, at least one notch is provided on each of the opposite sides of the blade row located on one side of the welding piece, and the notch is located in the injection molding structure.

[0007] Preferably, the blade bar is a flat plate structure, the welding plate is a sheet structure, and the welding plate has a through hole for inserting the blade bar, with one end of the blade bar inserted into the through hole.

[0008] Preferably, the outer periphery where the through hole contacts the blade array is connected by laser welding.

[0009] Preferably, a connecting hole is provided on the blade bar.

[0010] Preferably, a sand-filling hole is provided on the welding piece on one side of the blade row.

[0011] Preferably, the injection-molded structure is formed by integrally connecting the blade row and the welding piece at one end using high-temperature nylon through a submerged mold injection molding process.

[0012] This invention uses an injection-molded structure to cover the connection end of the blade pack and the welding piece, making them an integral structure. This improves the connection reliability between the blade pack and the welding piece, saves processing materials, reduces costs, and ensures the effective welding area of ​​the welding piece.

[0013] Compared to existing contact knife structures, it is lighter in weight and does not affect the effective welding area of ​​the melt or the amount of arc-extinguishing medium. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the injection molding structure, in which the injection molding structure is shown transparently to show the internal structure.

[0015] Figure 2 It is a schematic diagram of a three-dimensional structure.

[0016] Figure 3 This is a schematic diagram of the structure in the direction of the welded piece.

[0017] Figure 4 This is a side view of the structure, in which the injection-molded structure is shown transparently to show the internal structure.

[0018] Figure Labels

[0019] 1. Blade block, 2. Welding piece, 3. Injection molding structure, 11. Connecting hole, 12. Notch, 21. Through hole, 22. Sand filling hole. Detailed Implementation

[0020] The contact knife structure for the fuse element of the present invention includes a conductive knife bar and a welding piece. The knife bar is inserted vertically onto the welding piece, and a high-temperature resistant injection-molded structure is wrapped around the connecting end of the knife bar and the welding piece.

[0021] The following describes preferred embodiments in detail with reference to the accompanying drawings. The directional terms used are for reference only and do not constitute a limitation on the technical solution of this invention.

[0022] The fuse uses a knife-type contact structure, see [link / reference]. Figures 1 to 4 It includes a blade rack 1, welding plates 2, and injection-molded structure 3.

[0023] The blade rack 1 is made of a conductive material and has connection holes 11 for mounting and connecting. Notches 12 are provided on both sides of the blade rack 1 near the end connected to the welding piece 2. In this embodiment, the blade rack 1 has a flat plate structure; in other embodiments, the blade rack 1 may also have a bent structure or other structures.

[0024] The welding piece 2 is made of a conductive material. A through hole 21 is provided on the welding piece 2 for inserting the blade assembly 1. A sand-filling hole 22 is provided on one side of the through hole 21 to facilitate sand filling. The shape of the welding piece 2 depends on the structure of the fused element; it can be circular, square, or other shapes.

[0025] During connection, one end of the blade rack 1 is inserted into the through hole 21 of the welding piece 2, and then laser welding is performed around the outer periphery of the through hole 21 that contacts the blade rack 1, so that the blade rack 1 is connected to the edge of the through hole 21. The notch 12 of the connected blade rack 1 is located on the outside of the welding piece 2.

[0026] Using a high-temperature resistant plastic material, such as high-temperature nylon PA6T, an injection molding process is employed to integrally form the connection end between the cutter head 1 and the welding piece 2, creating an injection-molded structure 3 at the connection end. The injection-molded structure 3 covers the outer periphery of the welding piece 2, the surface edge of the welding piece 2 facing away from the cutter head 1, and the adjacent portions of the surfaces of the cutter head 1 and the welding piece 2. The notch 12 of the cutter head 1 is located within the injection-molded structure. During injection molding, the injection material fills the notch 12 of the cutter head 1 to form a limiting structure, which enhances the connection strength between the injection-molded structure 3 and the connection end between the cutter head 1 and the welding piece 2.

Claims

1. A contact blade structure for a fuse, characterized by comprising: The cutting blade and the welding sheet are connected by inserting the cutting blade into the welding sheet in a perpendicular way, and the periphery of the connecting end of the cutting blade and the welding sheet is covered by a high-temperature-resistant injection structure.

2. The contact blade structure according to claim 1, characterized by The thickness of the injection structure is greater than the thickness of the welding sheet, and the part of the cutting blade adjacent to the surface of the welding sheet is located in the injection structure.

3. The contact blade structure of claim 1, wherein At least one notch is arranged on the opposite sides of the cutting blade on one side of the welding sheet, and the notch is located in the injection structure.

4. The contact blade structure of claim 1, wherein The cutting blade is a flat plate structure, and the welding sheet is a sheet structure, and a through hole for inserting the cutting blade is arranged in the welding sheet, and the connecting end of the cutting blade is inserted into the through hole.

5. The shutter structure of claim 4, wherein, The periphery of the through hole in contact with the cutting blade is connected by laser welding.

6. The contact blade structure of claim 1, wherein A connecting hole is arranged on the cutting blade.

7. The contact blade structure of claim 1, wherein A sand pouring hole is arranged on the welding sheet on one side of the cutting blade.

8. The doctor structure of claim 1, wherein, The connecting end of the cutting blade and the welding sheet is integrally formed into the injection structure by using high-temperature nylon through a buried mold injection process.

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