CN218918766U - Melt structure - Google Patents

Abstract

The utility model relates to the field of fuses, in particular to a melt structure, which is provided with a plurality of oblong holes at intervals along the length direction of the melt, wherein wide and narrow necks are respectively formed between the positions of straight lines on the inner walls of the oblong holes and two sides of the melt. The melt structure of the utility model has short-circuit protection, strong current impact resistance and low-power overload protection through the narrow neck with larger size.

Description

Melt structure

Technical Field

The utility model relates to the field of fuses, in particular to a fuse melt structure for a fuse.

Background

The traditional melt structure is designed to realize the short-circuit protection requirement, and the sectional area design of the common narrow neck is smaller, so that a reliable protection system in the case of short-circuit fault can be met. However, the system has lightning current, operation surge current and the like, and early fusing can occur, so that loss is brought to users. For example, a fuse melt structure disclosed in chinese patent CN215183830U has a small neck size of the melt, and is easy to fuse in advance.

With the increasing demand for lightning protection (anti-surge current) in power distribution systems, fuse design is required to take a balance between short-circuit fast-fusing and current surge tolerance, and to protect circuits at low-power overload fault currents.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide a melt structure which has a narrow neck with a larger size and has short-circuit protection, strong current impact resistance and low-power overload protection.

In order to solve the technical problems, the technical scheme provided by the utility model is that a melt structure is provided with a plurality of oblong holes at intervals along the length direction of the melt, and wide and narrow necks are respectively formed between the positions of the inner walls of the oblong holes in straight lines and the two sides of the melt.

Preferably, grooves are respectively formed in the edges of the melt on two sides of each oblong hole, and the bottoms of the grooves are parallel to the inner wall of each oblong hole at straight positions.

Preferably, the length of the groove is smaller than the length of the oblong hole.

Preferably, a metallurgical effect material layer is arranged at the narrow neck regions on both sides of the oblong hole in the central part in the length direction of the melt.

Preferably, the width of the wide and narrow neck is greater than or equal to 0.5mm.

According to the fusing structure, the long round hole is formed in the melt to form the wide and narrow neck, so that the melt has the short-circuit protection, the strong current impact resistance and the low-power overload protection.

The narrow neck region with longer length and larger width can improve the pre-arc Joule integral of the melt, and can ensure stronger current impact resistance of the product.

Through continuous slotted hole setting, reduced the metal use amount of fuse-element, the whole energy that produces when short circuit fault appears is less, can realize reliable protection.

By arranging the metallurgical effect material layer at the narrow neck of the central part of the melt, when fault current occurs, the narrow neck arranged at the central part of the melt is fused earliest under the action of the metallurgical effect material layer, so that the short-circuit protection capability is improved.

The fusing structure of the utility model has simple structure, convenient processing, short-circuit protection, strong current impact resistance and low-power overload protection.

Drawings

FIG. 1 is a schematic view of the melt structure of the present utility model.

Detailed Description

The above technical solution, the preferred embodiments are now described in detail with reference to the drawings.

The melt base material 10 is a strip-shaped sheet structure, and is made of conductive material, such as copper or copper-silver alloy material. A plurality of oblong holes 20 are arranged on the melt base material 10 at intervals along the length direction of the melt base material, the distance between two adjacent oblong holes 20 is the same, the length direction of each oblong hole is consistent with the length direction of the melt base material 10, and the radius of the arc surfaces at the two ends of each oblong hole 20 is R.

Grooves 11 are respectively formed in the side edges of the melt substrate on the two sides of the oblong hole 20, the bottoms of the grooves 11 are of planar structures, and the length of the grooves 11 is smaller than that of the oblong hole 20. The bottom of the groove 11 is parallel to the plane of the inner wall of the oblong hole 20, and a wide neck 30 is formed between the bottom of the groove and the plane of the inner wall of the oblong hole, the width of the wide neck 30 is a, and in this embodiment, the width a is greater than or equal to 0.5mm. The length of the wide and narrow neck is the length of the plane treatment place of the inner wall of the oblong hole 20 and the parallel place of the bottom plane structure of the groove 11. The throat in this embodiment is a wide, long, and large-sized throat structure compared to existing melt structures. The wide and narrow neck with longer length and larger width can improve the pre-arc Joule integral of the melt, and can ensure that the current impact resistance of the product is stronger. The melt adopts the continuous use of a plurality of rows of long round hole wide and narrow necks, the metal usage amount of the melt can be reduced, the whole energy generated when the short circuit fault occurs is smaller, and the reliable protection can be realized.

A metallurgical effect material layer 40 is provided at the wide neck 30 at both sides of the oblong hole 20 at the center of the length of the melt base material 10, and the width and length of the metallurgical effect material layer 40 are identical to those of the wide neck 30. The metallurgical effect material layer 40 is made of a material having a low melting point, such as tin. When the low-power overload fault current occurs, the melt dissipates heat outwards through the metal terminals at the two ends of the fuse and the fuse shell, and the heat dissipation path of the wide narrow neck 30 at the central part of the melt is longest. The current density at the wide narrow neck is the largest when the low-power overload fault occurs, the temperature at the most middle position is the highest, the melting point of the metallurgical effect material is reached first, and under the action of the metallurgical effect, the narrow neck at the middle position is fused first, so that the protection function of the low-power overload fault is achieved.

Claims (5)

1. A melt structure is characterized in that a plurality of oblong holes are sequentially arranged at intervals along the length direction of a melt, and wide and narrow necks are respectively formed between the plane position of the inner wall of each oblong hole and two sides of the melt.

2. The melt structure of claim 1, wherein grooves are formed in the melt edges on both sides of each oblong hole, respectively, and the bottoms of the grooves are parallel to the inner wall of the oblong hole at straight positions.

3. The melt structure of claim 2, wherein the length of the groove is less than the length of the oblong hole.

4. A melt structure according to any one of claims 1 to 3, characterized in that a layer of metallurgical effect material is provided at the wide and narrow necks on both sides of the oblong hole in the central part in the length direction of the melt.

5. A melt structure according to any one of claims 1 to 3, wherein the width of the wide and narrow neck is greater than or equal to 0.5mm.

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