Melt structure and fuse with high arc extinguishing capability

Abstract

The utility model relates to a fuse, and specifically relates to a melt structure and a fuse with high arc extinguishing capability. Comprising two connecting pieces used for being connected with conductive terminals of the fuse, a plurality of connecting parts and a plurality of fusing parts. The plurality of fusing parts and the plurality of connecting parts are sequentially and alternately connected to form a fuse body, and two ends of the fuse body are respectively connected with the two connecting pieces; protective plates are arranged on the upper surface and the lower surface of the fusing part; a gap is reserved between the protection plate and the fusing part, and the gap is filled with an arc extinguishing medium. According to the utility model, an unextinguished electric arc is blocked through the protection plate, the spraying direction of the electric arc is changed, and the transmission path of the electric arc between the protection plate and the fusing part is changed, so that the energy of the electric arc is continuously weakened in the transmission process, the impact strength of the electric arc on the wall of the ceramic tube of the fuse is greatly reduced, and the ceramic tube is prevented from being broken.

Description

Technical Field

[0001] This utility model relates to fuses, specifically to a fuse with a fusible element structure and high arc-extinguishing capability. Background Technology

[0002] A fuse, commonly known as a "fuse," is an overcurrent protection device widely used in power distribution and control systems, primarily for short-circuit or overload protection. The mainstream thermal fuse on the market today consists of an insulating tube, conductive terminals, a fusible element, and an arc-extinguishing medium, among other auxiliary materials. Under specified voltage conditions, when the line current flows through the fusible element, the current-sensing point (at the narrowest point) of the fusible element melts and breaks the circuit within a specified time, thus safely interrupting the fault current.

[0003] During the current interruption process of a fuse, the tube body is subjected to extreme pressure due to the instantaneous high temperature and high pressure. Existing fuse tube materials and structures are insufficient to effectively disperse and withstand this pressure, leading to frequent tube ruptures. This not only damages the fuse itself but may also trigger short circuits, fires, and other safety accidents in surrounding equipment, posing a serious threat to the stable operation of the power system and personnel safety.

[0004] Faced with complex and ever-changing power systems, especially when there are surge currents, instantaneous overvoltages and other electrical shocks, the performance of existing fuses cannot meet the requirements. When an electrical shock occurs, the fuse may not be able to quickly and effectively cut off the current, causing other equipment in the circuit to be subjected to excessive voltage and current, resulting in equipment damage and affecting the reliability of the entire power system. Utility Model Content

[0005] The purpose of this invention is to solve the technical problem that existing fuses cannot withstand electrical shocks, and to provide a fuse with a fusible element structure and high arc-extinguishing capability.

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

[0007] A fusible structure includes two connectors for connecting to conductive terminals of a fuse, and a plurality of connecting portions and fusible portions;

[0008] Multiple fusible sections and multiple connecting sections are sequentially and alternately connected to form a melt, and the two ends of the melt are respectively connected to two connecting parts;

[0009] Protective plates are provided on both the upper and lower surfaces of the fuselage section;

[0010] A gap is left between the protective plate and the fuse part, and the gap is filled with an arc-extinguishing medium.

[0011] Furthermore, both sides of the protective plate are fixed to the surface of the fused portion with adhesive;

[0012] A gap is formed between the protective plate, the fused portion, and the adhesive located on both sides of the protective plate.

[0013] Furthermore, the adhesive is any one of UV adhesive, 703 adhesive, or 801 adhesive.

[0014] Furthermore, the protective plate is a mica plate or a boron nitride plate.

[0015] Furthermore, the connecting part and the fused part are made of any one of copper, silver or copper-silver alloy.

[0016] Furthermore, the arc-extinguishing medium is quartz sand.

[0017] Furthermore, the fusible portion is provided with multiple through holes, and the fusible portion between two adjacent through holes forms a narrow diameter.

[0018] A high arc-extinguishing capability fuse includes an insulating tube, with conductive terminals at both ends of the insulating tube;

[0019] The melt structure is placed inside an insulating tube, and the two connecting parts of the melt structure are respectively connected to the two conductive terminals of the insulating tube.

[0020] The insulating tube is filled with the arc-extinguishing medium;

[0021] Both ends of the insulating tube are fitted with connecting terminals, which are connected to conductive terminals.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] 1. The fusible element structure and high arc-extinguishing capacity fuse provided by this utility model are achieved by setting protective plates on the upper and lower surfaces of the fusible part, and filling the space between the protective plates and the fusible part with an arc-extinguishing medium. When an electric arc is generated in the circuit, the arc-extinguishing medium can extinguish the arc. At the same time, the protective plates can block the unextinguished arc and change the direction of the arc. Since the propagation path of the arc between the protective plates and the fusible part is changed, the arc energy is continuously weakened during the propagation process, which greatly reduces the impact intensity of the arc on the ceramic tube wall of the fuse and prevents the ceramic tube from breaking.

[0024] 2. The fusible structure and high arc-extinguishing capacity fuse provided by this utility model have a protective plate made of mica plate or boron nitride plate. Because mica plate or boron nitride plate has excellent electrical insulation performance and mechanical strength, when an electric shock occurs, it can buffer the instantaneous high-energy impact by its own characteristics, greatly reducing the direct impact of the impact intensity on the tube body, thereby effectively preventing the tube body from cracking due to excessive impact. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 .

[0027] Explanation of reference numerals in the attached drawings: 1-connector, 2-connection part, 3-fusible part, 4-protective plate, 5-gap, 6-arc extinguishing medium, 7-adhesive, 8-narrow diameter. Detailed Implementation

[0028] 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.

[0029] like Figure 1 and Figure 2 As shown, a fusible element structure is applied to fuses of various protection types; it includes two connectors 1 for connecting to the conductive terminals of the fuse, and multiple connecting parts 2 and fusible parts 3 made of silver; the multiple fusible parts 3 and multiple connecting parts 2 are sequentially and alternately connected to form a fusible element, and the two ends of the fusible element are respectively connected to the two connectors 1;

[0030] like Figure 1 As shown, after the fuse part 3 melts and generates an electric arc, in order to block the unextinguished electric arc and change the direction of the electric arc, a protective plate 4 is provided on both the upper and lower surfaces of the fuse part 3. The protective plate 4 is a mica plate. The protective plate can change the propagation path of the electric arc in the ceramic tube of the fuse, so that the energy of the electric arc is continuously weakened during the propagation process, and the impact intensity of the electric arc on the ceramic tube wall of the fuse is greatly reduced, preventing the ceramic tube from breaking.

[0031] like Figure 1 As shown, in order to extinguish the electric arc after the fuse part 3 melts and generates an electric arc, a gap 5 is left between the protective plate 4 and the fuse part 3. The gap 5 is filled with an arc-extinguishing medium 6, which is quartz sand. The arc is extinguished by absorbing the energy of the electric arc through the quartz sand.

[0032] like Figure 1 As shown, in order to fix the protective plate and the fuse part, the protective plate 4 is fixed to the surface of the fuse part 3 by adhesive 7; a gap 5 is formed between the protective plate 4, the fuse part 3 and the adhesive 7 located on both sides of the protective plate 4.

[0033] In this embodiment, the adhesive 7 is a UV adhesive. Since UV adhesive has a certain deformation capability, it can absorb the impact of the electric arc. Moreover, at the high temperature of the electric arc, the UV adhesive will volatilize gas, which will increase the pressure inside the ceramic tube of the fuse and help suppress the arc's morphological expansion.

[0034] like Figure 1 As shown, in order to enable the fuse section 3 to fuse more quickly, multiple through holes are provided on the fuse section 3, and the fuse section 3 between two adjacent through holes forms a narrow diameter 8.

[0035] The shape of the connecting part 2 can be V-shaped or straight.

[0036] This embodiment also discloses a high arc-extinguishing capability fuse based on the above-mentioned fusible structure, including an insulating tube with conductive terminals at both ends; a fusible structure is placed inside the insulating tube, and two connecting parts 1 of the fusible structure are respectively connected to the two conductive terminals of the insulating tube; the insulating tube is filled with an arc-extinguishing medium 6; and connecting terminals are sleeved at both ends of the insulating tube, which are connected to the conductive terminals.

[0037] In other embodiments of this utility model:

[0038] Adhesive 7 is a type of adhesive such as 703 or 801 that has fixing ability, flame retardancy, impact resistance, ability to absorb impact stress in the bonding area, low volatility and non-toxicity, and does not corrode metals.

[0039] Protective plate 4 is a boron nitride plate.

[0040] The connecting part 2 and the fused part 3 are made of copper or copper-silver alloy.

[0041] 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 melt structure, characterized in that: It includes two connectors (1) for connecting to the conductive terminals of a fuse, and multiple connecting parts (2) and fuse parts (3); Multiple fusible sections (3) and multiple connecting sections (2) are sequentially and alternately connected to form a melt, and the two ends of the melt are respectively connected to two connecting parts (1); The upper and lower surfaces of the fuse part (3) are provided with protective plates (4); A gap (5) is left between the protective plate (4) and the fuse part (3), and the gap (5) is filled with an arc-extinguishing medium (6).

2. The melt structure according to claim 1, characterized in that: Both sides of the protective plate (4) are fixed to the surface of the fused part (3) by adhesive (7); A gap (5) is formed between the protective plate (4), the fused portion (3), and the adhesive (7) located on both sides of the protective plate (4).

3. The melt structure according to claim 2, characterized in that: The adhesive (7) is any one of UV adhesive, 703 adhesive or 801 adhesive.

4. The melt structure according to claim 2, characterized in that: The protective plate (4) is a mica plate or a boron nitride plate.

5. The melt structure according to claim 1, characterized in that: The connecting part (2) and the fused part (3) are made of copper, silver or copper-silver alloy.

6. The melt structure according to claim 1, characterized in that: The arc-extinguishing medium (6) is quartz sand.

7. The melt structure according to claim 2, characterized in that: The fuse section (3) has multiple through holes, and the fuse section (3) between two adjacent through holes forms a narrow diameter (8).

8. A high arc-extinguishing capability fuse based on the fusible element structure according to any one of claims 1-7, characterized in that: It includes an insulating tube, with conductive terminals at both ends; The melt structure is placed inside the insulating tube, and the two connecting parts (1) of the melt structure are respectively connected to the two conductive terminals of the insulating tube; The insulating tube is filled with the arc-extinguishing medium (6); Both ends of the insulating tube are fitted with connecting terminals, which are connected to conductive terminals.

Images