Melt structure

Abstract

The utility model provides a melt structure, two ends of a melt are respectively provided with a welding end, a plurality of bending sections and at least one narrow neck section are formed on the melt between the two welding ends, and the welding ends are made of copper; the narrow neck section and the bent section are made of aluminum; or one of the narrow neck section and the bent section is made of aluminum, and the other one of the narrow neck section and the bent section is made of copper. The narrow neck sections are arranged between the two bent sections or on the outer sides of the bent sections, and the multiple narrow neck sections and the multiple bent sections are distributed alternately. Therefore, the melt provided by the utility model has the advantages of high reliability and low manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit protection, and more particularly to a melt structure. Background Art

[0002] A fuse is an electrical device that generates heat to melt its fuse element when the current exceeds a specified value, disconnecting the circuit and thus protecting itself. A fuse primarily consists of an insulating casing, terminals, a fuse element, and an arc-extinguishing medium. The terminals are located at both ends of the insulating casing, and the fuse element is located between the terminals. The fuse element is typically made of copper, silver, or a copper-silver composite. Electrical conduction between the fuse element and the terminals is achieved through welding (laser welding, resistance welding, soldering, etc.).

[0003] Since copper and silver are currently relatively expensive, the production cost of the fuse continues to rise, which is contrary to the cost-reduction requirements of the end-users of the fuse. In addition, the melting point of silver is 961°C and the melting point of copper is 1083°C. When the fuse blows, a larger current is required, generating more heat accumulation to make the fuse melt. The higher melting temperature is not conducive to the fuse's protective effect on the circuit.

[0004] Due to the above situation, some fuses currently use a copper-aluminum composite structure as the melt. Aluminum is the third most abundant metal in the Earth's crust and is more abundant than more valuable resources such as copper and silver. Furthermore, as the world's largest aluminum producer, China produces over tens of millions of tons of primary aluminum annually, offering a significant cost advantage. Furthermore, aluminum has a melting point of 660°C. Compared to copper and silver, using copper and aluminum as the melt material lowers the melting temperature, improving the fuse's protective effect on the circuit. However, in the current fuse manufacturing process, the addition of aluminum to the melt, whether through alloying, plating, or through-metal strips, cannot guarantee reliable welding between the aluminum melt and the terminal block using resistance welding. Utility Model Content

[0005] The purpose of the utility model is to provide a melt structure with high reliability and low manufacturing cost.

[0006] In order to achieve the above objectives, the solution of the present invention is:

[0007] A melt structure has welding ends at both ends of the melt, and multiple bending sections and at least one narrow neck section are formed on the melt between the two welding ends. The welding ends are made of copper; the narrow neck section and the bending section are both made of aluminum; or one of the narrow neck section and the bending section is made of aluminum and the other is made of copper.

[0008] Furthermore, the narrow neck section is arranged between the two bending sections or outside the bending sections, and there are multiple narrow neck sections and bending sections that are distributed alternately.

[0009] Furthermore, the narrow neck section and the bending section are both made of aluminum.

[0010] Furthermore, the narrow neck section is made of aluminum, and the bending section is made of copper.

[0011] Furthermore, the material of the narrow neck section is copper, and the material of the bending section is aluminum.

[0012] Furthermore, the melt is formed by alternatingly arranging copper sheets and aluminum sheets and hot pressing them together.

[0013] Furthermore, the welding end includes at least one welding plane for welding with the welding pad of the contact blade.

[0014] After adopting the above scheme, the melt of the utility model has the following advantages:

[0015] 1. The two welding ends of the melt are made of copper. Even if the inner melt contains aluminum, it will not affect the welding reliability of the aluminum melt and the terminal. The copper welding ends can retain the original welding process and welding effect.

[0016] 2. The material of the melt between the two welding ends is aluminum or copper and aluminum, which can reduce the melting temperature of the melt and improve the protection effect of the fuse using this melt on the circuit;

[0017] 3. The use of aluminum in the melt ensures product reliability while reducing the production cost of the melt and improving the market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the first embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of a second embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of a third embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the fuse element of the present invention being arranged in a fuse (the insulating housing is omitted).

[0022] Figure 5 for Figure 4 side view.

[0023] Description of Figure Numbers:

[0024] 10 melt; 1 welding end; 2 bending section; 3 narrow neck section; 31 notch; 4 contact knife; 41 welding pad; 42 contact knife handle. DETAILED DESCRIPTION

[0025] In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0026] like Figure 1 As shown in the figure, a melt structure of the present invention comprises a melt 10 with copper welding ends 1 at each end. Multiple bends 2 and at least one narrow neck section 3 are formed on the melt 10 between the two welding ends 1. While the welding ends 1 are made of copper, the narrow neck section 3 and the bend section 2 can both be made of aluminum, or one of the narrow neck section 3 or the bend section 2 can be made of aluminum, while the other can be made of copper.

[0027] The narrow neck section 3 can be located between two bent sections 2 or outside of a bent section 2. Multiple narrow neck sections 3 and bent sections 2 can be provided and spaced apart. The narrow neck section 3 can include a notch in the melt 1 to reduce the conductive cross-sectional area of ​​the melt. In this embodiment, a row of multiple notches 31 are provided at intervals across the width of the melt 1. The melt 10 can include multiple bent sections 2 protruding from a single sheet at intervals. The bending extends the total length of the melt 10 to increase the rated values ​​of the voltage and current parameters passing through the melt. The narrow neck section 3 can be located in a straight section between the bent sections 12 or outside of the bent sections 2.

[0028] See Figure 1 , which is the first embodiment of the present utility model. In this embodiment, the narrow neck section 3 and the bending section 2 are both made of aluminum.

[0029] See Figure 2 , which is the second embodiment of the present utility model. In this embodiment, the material of the narrow neck section 3 is aluminum, and the material of the bending section 2 is copper.

[0030] See Figure 3 , which is the third embodiment of the present utility model. In this embodiment, the material of the narrow neck section 3 is copper, and the material of the bending section 2 is aluminum.

[0031] Since the melt 10 is made of aluminum and copper and arranged in intervals, the material cost and the fusing temperature of the melt 10 are reduced. The fuse using the melt 10 of the above embodiment not only ensures the reliability of the protection circuit, but also significantly reduces the manufacturing cost and improves the market competitiveness.

[0032] In the above embodiment, the melt 10 is made of copper and aluminum materials arranged alternately. During production, the copper sheets and the aluminum sheets can be alternately arranged and then hot-pressed to form a whole.

[0033] The welding end 1 of the present invention comprises at least one welding plane for welding with the welding pad 41 of the contact blade 4. Figure 4 and Figure 5When installed in a fuse, the melt 10 of the present invention is housed within the fuse's insulating housing (not shown). Contact blades 4 are provided at both ends of the insulating housing. Each contact blade 4 includes a soldering pad 41 with a contact handle 42 disposed on the outside of the soldering pad 41. The insides of the two soldering pads 41 face each other, and at least one melt 10 of the present invention is welded between the two soldering pads 41. Specifically, the soldering ends 1 at both ends of the melt 10 are in surface-to-surface contact with the soldering pads 41 before being welded separately. Since the soldering ends 1 are made of copper, the weld stability between the soldering ends 1 and the soldering pads 41 is ensured, compensating for the poor welding performance of aluminum.

[0034] The above is only an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A melt structure, wherein welding ends are provided at both ends of the melt, and a plurality of bending sections and at least one narrow neck section are formed on the melt between the two welding ends, characterized in that: The welding end is made of copper; the narrow neck section and the bending section are both made of aluminum; or one of the narrow neck section and the bending section is made of aluminum and the other is made of copper.

2. A melt structure according to claim 1, characterized in that: The narrow neck section is arranged between the two bending sections or outside the bending sections. There are multiple narrow neck sections and bending sections that are distributed alternately.

3. A melt structure according to claim 2, characterized in that: The narrow neck section and the bending section are both made of aluminum.

4. A melt structure according to claim 2, characterized in that: The narrow neck section is made of aluminum, and the bending section is made of copper.

5. A melt structure according to claim 2, characterized in that: The narrow neck section is made of copper, and the bending section is made of aluminum.

6. A melt structure according to any one of claims 1 to 5, characterized in that: The melt is formed by alternating copper and aluminum sheets and hot pressing them together.

7. A melt structure according to claim 1 or 2, characterized in that: The welding end includes at least one welding plane for welding with the welding pad of the contact knife.

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