A fuse and a fuse body

Abstract

The application discloses a melt and a fuse body, and belongs to the technical field of fuse bodies. A plurality of bending sections are arranged on the melt to form a reciprocating bending shape. A plurality of fuse holes are arranged on the bending sections in a width direction of the melt. A pre-fuse section reserved between any two adjacent fuse holes in the width direction of the melt forms a narrow diameter structure. The bending structure is distributed in a staggered manner in space and is not on the same straight line. The space staggered manner makes the generated arc sections unable to easily combine, so that the arc sections are divided into a plurality of independent short arcs, thereby improving the arc extinguishing capacity.

Description

Technical Field

[0001] This invention relates to the field of fuse technology, and in particular to a fusible element and a fuse element. Background Technology

[0002] A fuse is an electrical device that breaks the circuit by melting itself when the current exceeds a specified value. In use, the fuse is connected in series in the circuit to be protected. When an overload or short-circuit current passes through the fuse, the fuse will heat up and melt, thus providing a certain degree of protection for power systems, various electrical equipment, and household appliances.

[0003] Currently, most existing fuse components adopt a straight-plate structure, which is formed by punching or etching narrow necks on a metal strip to achieve fuse protection under fault current. However, when a straight-plate fuse melts, the narrow necks are aligned along the same straight line, and the arc is prone to merge into a single long arc, resulting in a prolonged arcing time and making the arc more difficult to extinguish.

[0004] Therefore, there is an urgent need to design a melt and a fuse to solve the technical problems of low arc cooling efficiency and insufficient heat dissipation area in the existing technology. Summary of the Invention

[0005] This invention provides a melt and a fuse to solve the technical problems of low arc cooling efficiency and insufficient heat dissipation area in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: This invention provides a melt comprising: The melt has multiple bending sections to make the melt form a reciprocating bending shape; The bent section has multiple fusing holes spaced apart along the width direction of the melt, and the pre-melting section between any two adjacent fusing holes in the width direction of the melt forms a narrow structure.

[0007] Furthermore, the area in the middle of the melt is a pre-melting region, and the other areas are auxiliary melting regions. The size of the melting hole in the pre-melting region is larger than the size of the melting hole in the other areas, so as to form a narrower diameter structure in the pre-melting region.

[0008] Furthermore, in the auxiliary pre-fuse region, the fuse hole includes a first fuse hole and a second fuse hole; The size of the first fuse hole is greater than or less than the size of the second fuse hole, and the first fuse hole and the second fuse hole are arranged alternately along the direction of the melt.

[0009] Furthermore, the melt is made of a silver-copper-tin alloy, and the surface of the melt is coated with an anti-oxidation coating.

[0010] Furthermore, the bending angle of the bent segment is 90 degrees.

[0011] A fuse, comprising: The device comprises an insulating housing, terminals, a sealing cap, and a fusible element. The fusible element is installed in the through cavity of the insulating housing and is arranged along the axial direction of the through cavity. There are two terminals, which are respectively connected to the two ends of the fusible element and exposed at both ends of the insulating housing. The sealing cap is installed on the outside of the terminals and seals the through cavity.

[0012] Furthermore, an inner cylinder is installed inside the insulating shell, and a partition is provided between the outer wall of the inner cylinder and the inner wall of the insulating shell, so that four independent through cavities are formed between the inner wall of the insulating shell and the outer wall of the inner cylinder, and a melt is installed in each through cavity; The sealing cap is also provided with a heat dissipation vent that aligns with the center hole of the inner cylinder.

[0013] Furthermore, the through cavity is filled with arc-extinguishing powder, which is a mixture of quartz sand powder and ceramic powder.

[0014] Furthermore, a fuse indicator unit is also installed on the insulating housing.

[0015] Furthermore, the insulating shell, the inner cylinder, and the partition are all integrally formed from ceramic material.

[0016] Compared with the prior art, the technical solution disclosed in this invention has the following beneficial effects: Because of the above-mentioned solution, the bending structure set in this invention causes the narrow-aperture structure to be distributed in a staggered manner in space, not on the same straight line. By using the spatial misalignment, the generated arc segments cannot be easily merged, and are thus divided into multiple independent short arcs, thereby improving the arc extinguishing capability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the melt structure in an embodiment of the present invention; Figure 2for Figure 1 A structural diagram from another perspective; Figure 3 This is a schematic diagram of the structure of the fuse in an embodiment of the present invention; Figure 4 This is a schematic cross-sectional view of the fuse body in an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of the fuse in an embodiment of the present invention.

[0019] Among them, 1. molten material; 101. fuse hole; 102. narrow diameter structure; 2. insulating shell; 3. wiring terminal; 4. sealing cover; 401. heat dissipation port; 5. arc extinguishing powder; 6. fuse indication unit; 7. inner cylinder. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] This invention provides a melt and a fuse to solve the technical problems of low arc cooling efficiency and insufficient heat dissipation area in the prior art.

[0023] refer to Figures 1 to 2 The melt disclosed in this embodiment of the invention has multiple bending sections on the melt 1 to form a reciprocating bending shape; multiple fusing holes 101 are provided on the bending sections and spaced apart along the width direction of the melt 1; the pre-melting section retained between any two adjacent fusing holes 101 in the width direction of the melt 1 forms a narrow diameter structure 102.

[0024] The bending section causes the narrow-diameter structures 102 to be spatially staggered and not on the same straight line. When the narrow-diameter structures 102 melt simultaneously under fault current, the resulting multiple arc segments are physically isolated by the bending structure, preventing them from merging into a single long arc. This also causes the total arc voltage drop formed by multiple short arc segments connected in series to be significantly higher than that of a single long arc. When the total arc voltage exceeds the power supply voltage, the arc extinguishes itself. Simultaneously, adjacent bending sections will generate currents in opposite directions under high current, producing mutually repulsive electrodynamic forces that push the arc and high-temperature metal vapor laterally away from the surface of the melt 1, allowing them to quickly embed into the arc-extinguishing medium at the corresponding location, accelerating energy dissipation. Furthermore, in the width direction of the melt 1, the narrow-diameter structures 102 on the same bending section are identical, all arranged in bending sections with consistent geometric parameters. This ensures that the narrow-diameter structures 102 heat up and melt almost synchronously under overload, avoiding current transfer and secondary arcing problems caused by the premature melting of individual narrow-diameter structures.

[0025] In this embodiment, the middle region of the fusible link 1 is designated as the pre-fusing region, while the other regions are designated as auxiliary fusing regions. The size of the fusing hole 101 in the pre-fusing region is larger than that in the other regions, forming a smaller narrow-aperture structure 102 within the pre-fusing region. Because the larger size of the fusing hole 101 in the pre-fusing region means that the width, cross-sectional area, and resistance of the pre-fusing segment between adjacent holes (i.e., the narrow-aperture structure 102) are smaller, the smaller diameter is smaller, and the resistance is greater. Therefore, under low-multiple overload currents, the smaller narrow-aperture structure in the middle region will reach its melting point first and melt, cutting off the circuit and achieving overload protection. When a high-multiple short-circuit current occurs, the enormous fault current causes all narrow-aperture structures 102 to generate extreme Joule heating in a very short time. All narrow-aperture structures 102 reach their melting point almost simultaneously and melt, achieving rapid short-circuit protection by cutting off the fault current. Based on this, in this embodiment, the middle region, as the pre-fusing region, undertakes the primary responsibility for overload protection, while the two side regions, as auxiliary fusing regions, work in conjunction with the middle region during a short circuit to achieve the breaking of the circuit.

[0026] In this embodiment, in the auxiliary fusing region, the fusing hole 101 includes a first fusing hole 101 and a second fusing hole 101; the size of the first fusing hole 101 is greater than or less than the size of the second fusing hole 101, and the first fusing hole 101 and the second fusing hole 101 are arranged alternately along the direction of the melt 1. Because the first fuse hole 101 and the second fuse hole 101 have different sizes, it means that the width of the narrow structure 102 formed between adjacent holes is different. The narrow structure 102 formed by the larger fuse hole 101 has a smaller width, while the narrow structure 102 formed by the other fuse hole 101 has a larger width. Based on this, when the fault current flows, the narrow structure 102 with a smaller width reaches the melting point and melts first. Subsequently, the narrow structure 102 with a larger width melts successively due to the continued accumulation and transfer of heat. This can form a gradient melting sequence melting mode, avoiding the instantaneous extreme current impact and violent arc explosion caused when all narrow structures melt simultaneously. Furthermore, because the alternating arrangement of the first fuse hole 101 and the second fuse hole 101 makes the narrow structures 102 formed not only different in resistance, but also alternately distributed in spatial position, the spacing and positional relationship between the break points during melting are more complex, and the arc is more difficult to merge into a continuous long arc. It should be clarified that the fuse hole 101 in the pre-fusible area is the largest fuse hole 101, and forms the narrowest diameter structure 102.

[0027] In this embodiment, the material of melt 1 is a silver-copper-tin alloy, and the surface of melt 1 is coated with an anti-oxidation coating. This is because the silver-copper-tin alloy has excellent resistance to slow plastic deformation at high temperatures, maintaining dimensional stability under long-term low-frequency, high-current operation. This prevents slow deformation of the melt due to its own gravity or thermal stress, thus ensuring long-term consistency of its fusing characteristics. Simultaneously, the anti-oxidation coating on the surface of melt 1 prevents oxidation and deterioration of the melt material under high-temperature, long-term operating conditions, ensuring long-term stability of its electrical and mechanical properties. For those skilled in the art, melt 1 can also be made of other metallic materials, as long as they meet the usage requirements.

[0028] In this embodiment, the bending angle of the bent section is 90 degrees. A 90-degree bend can more effectively increase the total length of the melt and disperse heat. For those skilled in the art, other bending angles can also be used, as long as a reciprocating bending shape can be formed.

[0029] refer to Figures 3 to 5This application also discloses a fuse, including an insulating shell 2, terminals 3, a sealing cap 4, and a fusible element 1. The fusible element 1 is installed in the through cavity of the insulating shell 2 and is arranged along the axial direction of the through cavity. Two terminals 3 are provided, which are respectively connected to the two ends of the fusible element 1 and exposed at both ends of the insulating shell 2. The sealing cap 4 is installed on the outside of the terminals 3 and seals the through cavity. As a further optimized solution, in this embodiment, an inner cylinder 7 is installed inside the insulating shell 2, and a partition is provided between the outer wall of the inner cylinder 7 and the inner wall of the insulating shell 2, so that four independent through cavities are formed between the inner wall of the insulating shell 2 and the outer wall of the inner cylinder 7, and a fusible element 1 is installed in each through cavity; the sealing cap 4 is also provided with a heat dissipation port 401 that is connected to the center hole of the inner cylinder 7. By setting up four independent through cavities, after any one path melts, the independent cavity structure ensures that the arc, metal vapor, and pressure wave generated when one path melts will not enter adjacent cavities, avoiding cascading melts and ensuring that each melt element 1 extinguishes its arc independently without interference. Simultaneously, under low overload conditions, the melt elements 1 of the other three paths can still maintain short-term operation even with increased current, providing the system with fault isolation and replacement window time. Furthermore, in this embodiment, the four independent through cavities surround the central hole of the inner cylinder 7. During use, the central hole can dissipate heat through the through airflow, ensuring the symmetry of heat dissipation conditions for each through cavity and improving heat dissipation uniformity. For those skilled in the art, setting four independent through cavities is not fixed; other numbers of through cavities can be set according to usage conditions, simply by changing the number of partitions accordingly.

[0030] In this embodiment, the insulating shell 2, the inner cylinder 7, and the partition are all integrally formed ceramic materials. Meanwhile, in this embodiment, the through cavity is filled with arc-extinguishing powder 5, which is a mixture of quartz sand powder and ceramic powder, wherein the quartz sand powder accounts for 70% and the ceramic powder accounts for 30%.

[0031] In this embodiment, a fuse indicator unit 6 is also installed on the insulating housing 2. The fuse indicator unit 6 outputs a clear visual signal through mechanical action, so that maintenance personnel can directly determine on-site whether the fuse 1 has been activated without disassembling the fuse or using detection instruments. For those skilled in the art, the fuse indicator unit 6 can be a flexible ejector indicator or an electronic trigger indicator. No specific limitation is made here. The specific structure and installation method of the fuse indicator unit 6 can be achieved using conventional technical means.

[0032] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A melt, characterized in that, include: The melt has multiple bending sections to make the melt form a reciprocating bending shape; The bent section has multiple fusing holes spaced apart along the width direction of the melt, and the pre-melting section between any two adjacent fusing holes in the width direction of the melt forms a narrow structure.

2. The melt according to claim 1, characterized in that, The area in the middle of the melt is a pre-melting region, and the other areas are auxiliary melting regions. The size of the melting hole in the pre-melting region is larger than the size of the melting hole in the other areas, so as to form a narrower diameter structure in the pre-melting region.

3. The melt according to claim 2, characterized in that, In the auxiliary pre-fusible region, the fuse hole includes a first fuse hole and a second fuse hole; The size of the first fuse hole is greater than or less than the size of the second fuse hole, and the first fuse hole and the second fuse hole are arranged alternately along the direction of the melt.

4. The melt according to claim 1, characterized in that, The melt is made of a silver-copper-tin alloy, and its surface is coated with an anti-oxidation coating.

5. The melt according to claim 1, characterized in that, The bending angle of the bent section is 90 degrees.

6. A fuse, characterized in that, include: The insulating housing, terminals, sealing cap, and molten material as described in any one of claims 1-5, wherein the molten material is installed in the through cavity of the insulating housing and is arranged along the axial direction of the through cavity; two terminals are provided and respectively connected to both ends of the molten material and exposed at both ends of the insulating housing; and the sealing cap is installed on the outside of the terminals and seals the through cavity.

7. The fuse according to claim 6, characterized in that, An inner cylinder is installed inside the insulating shell, and a partition is provided between the outer wall of the inner cylinder and the inner wall of the insulating shell, so that four independent through cavities are formed between the inner wall of the insulating shell and the outer wall of the inner cylinder, and a melt is installed in each through cavity; The sealing cap is also provided with a heat dissipation vent that aligns with the center hole of the inner cylinder.

8. The fuse according to claim 6, characterized in that, The through cavity is filled with arc-extinguishing powder, which is a mixture of quartz sand powder and ceramic powder.

9. The fuse according to claim 6, characterized in that, The insulating housing is also equipped with a fuse indicator unit.

10. The fuse according to claim 7, characterized in that, The insulating shell, the inner cylinder, and the partition are all integrally formed from ceramic material.

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