A fast-assembleable fuse

Abstract

The utility model relates to a fuse, concretely relates to a fuse capable of being rapidly assembled, including fuse tube and two wire terminals respectively located at both ends of the fuse tube, a small end of the wire terminal is sleeved with an end cover, a large end of the wire terminal is fixed to the end of the fuse tube through the end cover, and the end cover is clamped to the end of the fuse tube, a fuse body located in the fuse tube is arranged between the large ends of the two wire terminals, and arc extinguishing medium is filled in the fuse tube, the utility model directly fixes the position of the wire terminal in the fuse tube through the end cover, and the end cover is installed to the end of the fuse tube in the clamping mode, the assembling action of the square tube fuse cover plate and the gasket and the press -fitting action of the round tube fuse pin are not needed, meanwhile, the use of the cover plate, the gasket and the pin is saved, and the production manufacturing cost is saved.

Description

Technical Field

[0001] This utility model relates to fuses, specifically to a fuse that can be quickly assembled. Background Technology

[0002] Fuses are widely used in high and low voltage power distribution and control systems, electrical equipment, new energy vehicles, and rail transit power grids. When the current exceeds the specified value for a sufficiently long time, the fuse melts due to its own heat or breaks the circuit mechanically, thereby protecting the equipment and instruments in the circuit.

[0003] Fuses can be classified according to the way they connect to the circuit via terminals, such as plug-in fuses, hook-type fuses, and flat terminal threaded connections. They can also be classified by structure, such as fully exposed, semi-enclosed, and fully enclosed types. Furthermore, they can be classified based on the presence or absence of filler, such as filled fuses and unfilled fuses. Their main structure generally includes a housing, a fusible element housed within the housing, and terminals located outside the housing that connect to the fusible element.

[0004] Currently, ordinary enclosed square tube fuses require screws to connect components such as cover plates, gaskets, terminals, and ceramic tubes. Round tube fuses require drilling holes and pins for fixing after the tube is inserted. The assembly process is more complex, and the cost of automated production is relatively high. Utility Model Content

[0005] The purpose of this invention is to solve the technical problems of current fuses having many assembly steps and high production costs, and to provide a fuse that can be assembled quickly.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0007] A quick-assembly fuse includes a fuse tube and two terminals located at both ends of the fuse tube.

[0008] An end cap is fitted onto the small end of the terminal block, and the large end of the terminal block is fixed to the end of the fusible tube by the end cap, with the end cap snapping into the end of the fusible tube.

[0009] Between the large ends of the two terminals is a molten element located inside the fusible tube, which is filled with an arc-extinguishing medium.

[0010] Furthermore, the inner walls at both ends of the fusion tube are provided with multiple circumferentially distributed support bosses;

[0011] The large end of the terminal block is placed inside the fusible tube, and the outer wall of the large end of the terminal block is in contact with the inner wall of the fusible tube.

[0012] The large end of the terminal block is fixed to the end of the fusible tube via an end cap and multiple supporting bosses.

[0013] Furthermore, the outer walls of both ends of the fusion tube are provided with a plurality of circumferentially distributed wedge-shaped blocks, and the end cap is provided with a buckle groove that matches the wedge-shaped blocks;

[0014] The end cap and the fusion tube are connected by wedge-shaped blocks and snap-fit ​​grooves.

[0015] Furthermore, the large end of the terminal block is provided with multiple sand filling ports, and the end cap is provided with sand filling holes corresponding to the sand filling ports;

[0016] The sand filling hole is equipped with a plug.

[0017] Furthermore, the large end of the terminal block has multiple notches of the same size as the support boss, and a sand filling port is formed between the notches and the inner wall of the fusion tube.

[0018] Furthermore, the small end of the terminal block is flat;

[0019] The end cap has a contoured waist hole that matches the shape of the small end of the terminal block.

[0020] Furthermore, the arc-extinguishing medium is quartz sand.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] 1. The quick-assembly fuse provided by this utility model directly fixes the terminal block inside the fuse tube by means of the end cap, and the end cap is installed at the end of the fuse tube by means of snap-fit; there is no need to perform the assembly action of the cover plate and gasket of the square tube fuse, and the pressing action of the pin of the round tube fuse. At the same time, the use of cover plate, gasket and pin is eliminated, saving production and manufacturing costs.

[0023] 2. The quick-assembly fuse provided by this utility model has a notch at the large end of the terminal block that is the same size as the support boss. During installation, the fuse element can be welded to the terminal block before the conduit is inserted. After the conduit is inserted, the terminal block only needs to be rotated to offset the position of the notch of the terminal block from that of the support boss, and then assembly can be performed. Compared with ordinary fuses, the assembly is more convenient. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present utility model;

[0026] Figure 3 This is one of the structural schematic diagrams of the fusion tube in the embodiments of this utility model;

[0027] Figure 4 This is the second schematic diagram of the structure of the fusion tube in this embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the terminal block structure in an embodiment of the present invention;

[0029] Figure 6 This is one of the structural schematic diagrams of the end cap in an embodiment of this utility model;

[0030] Figure 7 This is the second schematic diagram of the end cap structure in an embodiment of this utility model.

[0031] Explanation of reference numerals in the attached diagram: 1-fusible tube, 2-terminal, 21-small end, 22-large end, 3-end cap, 4-fusible element, 5-support boss, 6-wedge-shaped locking block, 7-snap slot, 8-sand filling port, 9-sand filling hole, 10-plug, 11-notch, 12-contour waist hole. Detailed Implementation

[0032] The technical solutions of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] like Figure 1 As shown, a quick-assembly fuse is primarily used in DC or AC circuits to protect them from damage caused by overloads and short circuits. Common applications include household circuits, industrial control systems, rail transit power grid systems, semiconductor current-carrying devices, power systems, electrical equipment, high-voltage electrical systems for electric vehicles, and protection systems for charging equipment.

[0034] like Figure 1 and Figure 2 As shown, the fuse includes a fuse tube 1 and two terminals 2 located at both ends of the fuse tube 1 respectively; an end cap 3 is fitted on the small end 21 of the terminal 2, and the large end 22 of the terminal 2 is fixed to the end of the fuse tube 1 by the end cap 3, and the end cap 3 is snapped into the end of the fuse tube 1.

[0035] Between the large ends 22 of the two terminals 2, there is a melt 4 located inside the fuse tube 1. The fuse tube 1 is filled with an arc-extinguishing medium, which is quartz sand.

[0036] When the fuse of this embodiment, which can be quickly assembled, is installed in the circuit, the external overload or short circuit fault current flows through the terminal 2 through the fuse 4. When the high current passes through the fuse 4, the fuse 4 will undergo resistance heating, causing the temperature of the fuse 4 to rise. When the temperature of the fuse 4 rises to a certain level, it will thermally melt and disconnect the circuit to protect the electrical safety.

[0037] like Figure 2 and Figure 4 As shown, in order to fix the terminal 2 between the end of the fusible tube 1 and the end cap 3, multiple circumferentially distributed support protrusions 5 are provided on the inner walls of both ends of the fusible tube 1; the large end 22 of the terminal 2 is placed inside the fusible tube 1, and the outer wall of the large end 22 of the terminal 2 is in contact with the inner wall of the fusible tube 1; the large end 22 of the terminal 2 is fixed to the end of the fusible tube 1 by the end cap 3 and the multiple support protrusions 5. The end cap 3 is snapped onto the outside of the fusible tube 1 and fixes the large end 22 of the terminal 2 by cooperating with the support protrusions 5.

[0038] like Figure 2 and Figure 3 As shown, in order to fix the end cap 3 to the fusion tube 1, multiple circumferentially distributed wedge-shaped locking blocks 6 are respectively provided on the outer walls of both ends of the fusion tube 1, such as... Figure 7 As shown, the end cap 3 has a snap-fit ​​groove 7 that matches the wedge-shaped snap-fit ​​block 6; the end cap 3 and the fusion tube 1 are snapped together by the wedge-shaped snap-fit ​​block 6 and the snap-fit ​​groove 7. After the wedge-shaped snap-fit ​​block 6 is snapped into the snap-fit ​​groove 7 of the end cap 3, the end cap 3 is snapped onto the fusion tube 1.

[0039] like Figure 2 As shown, in order to facilitate the filling of the arc-extinguishing medium into the fuse tube 1 of the assembled fuse, the large end 22 of the terminal 2 is provided with multiple sand filling ports 8, and the end cap 3 is provided with sand filling holes 9 corresponding to the sand filling ports 8; the sand filling holes 9 are provided with plugs 10, which are used to prevent the arc-extinguishing medium in the fuse tube 1 from leaking out through the sand filling holes 9.

[0040] like Figure 5 As shown, in order to facilitate the insertion of the tube after the terminal 2 and the molten material 4 are welded, the large end 22 of the terminal 2 is provided with multiple notches 11 of the same size as the support boss 5. The notches 11 and the inner wall of the molten tube 1 form a sand filling port 8.

[0041] like Figure 6 and Figure 7 As shown, in order to restrict the circumferential rotation of the terminal 2 within the fuse tube 1 by means of the end cap 3, the small end 21 of the terminal 2 is flat; the end cap 3 is provided with a contoured waist hole 12 that matches the shape of the small end 21 of the terminal 2.

[0042] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A quick-assembly fuse, characterized in that: It includes a fusible tube (1) and two terminals (2) located at both ends of the fusible tube (1); An end cap (3) is fitted on the small end (21) of the terminal (2), and the large end (22) of the terminal (2) is fixed to the end of the fusible tube (1) through the end cap (3), and the end cap (3) is snapped into the end of the fusible tube (1); A melt (4) located inside the melt tube (1) is provided between the large ends (22) of the two terminals (2), and the melt tube (1) is filled with an arc-extinguishing medium.

2. The quick-assembly fuse according to claim 1, characterized in that: The inner walls of both ends of the fusion tube (1) are provided with multiple circumferentially distributed support protrusions (5); The large end (22) of the terminal block (2) is placed inside the fusible tube (1), and the outer wall of the large end (22) of the terminal block (2) is in contact with the inner wall of the fusible tube (1); The large end (22) of the terminal block (2) is fixed to the end of the fusible tube (1) by the end cap (3) and multiple support bosses (5).

3. The quick-assembly fuse according to claim 1, characterized in that: Multiple circumferentially distributed wedge-shaped blocks (6) are provided on the outer walls of both ends of the fusion tube (1), and a buckle groove (7) adapted to the wedge-shaped blocks (6) is provided on the end cap (3); The end cap (3) and the fusion tube (1) are engaged by a wedge-shaped locking block (6) and a snap-fit ​​groove (7).

4. The quick-assembly fuse according to claim 1, characterized in that: The large end (22) of the terminal block (2) is provided with multiple sand filling ports (8), and the end cap (3) is provided with sand filling holes (9) corresponding to the sand filling ports (8); The sand filling hole (9) is provided with a plug (10).

5. The quick-assembly fuse according to claim 4, characterized in that: The large end (22) of the terminal block (2) has multiple notches (11) of the same size as the support boss (5), and a sand filling port (8) is formed between the notch (11) and the inner wall of the fusion tube (1).

6. The quick-assembly fuse according to claim 1, characterized in that: The small end (21) of the terminal block (2) is flat; The end cap (3) has a contoured waist hole (12) that matches the shape of the small end (21) of the terminal block (2).

7. The quick-assembly fuse according to claim 1, characterized in that: The arc-extinguishing medium is quartz sand.

Images