Lead-free secondary fuse

Abstract

This invention relates to a lead-free secondary fuse, which mainly includes an insulating body with an internal hollow cavity, two conductive inner caps, at least one conductive fuse element, and two conductive outer caps. The two conductive inner caps are respectively fitted onto both ends of the insulating body. The conductive fuse element is longitudinally inserted into the hollow cavity, with its two clamping ends extending out of the cavity and bent. Lead-free riveting spot welding is applied to the outer side surface of the corresponding inner cap end. The two conductive outer caps are respectively fitted onto the outside of the inner caps, and the inner wall surface of the outer cap sidewall is in direct contact with the outer wall surface of the inner cap sidewall. The two are connected by lead-free riveting spot welding. With the above structure, this invention completely eliminates the traditional solder layer to achieve lead-free environmental protection. At the same time, the contact resistance is greatly reduced through tight physical pressing and spot welding, thereby improving the high current conductivity stability and structural impact resistance.

Claims

1. A secondary-side fuse, comprising: A main body, which is made of insulating material and has a hollow cavity inside; two inner caps, which are made of conductive material and are respectively fitted onto the two ends of the main body from the outside of the main body, and the inner sidewalls of the inner caps are riveted and spot-welded to the outer sidewalls of the main body without lead; at least one fuse element, which is made of conductive material and is longitudinally inserted into the hollow cavity of the main body, and each fuse element has a clamping end at both ends, the clamping end extending out of the hollow cavity of the main body, and after bending, is riveted and spot-welded to the outer side of the corresponding end of the inner cap without lead; two outer caps, which are made of conductive material and are respectively fitted onto the outside of the corresponding inner caps with lead-free riveting and spot-welded, and the inner wall surface of the sidewall of each outer cap and the outer wall surface of the sidewall of the corresponding inner cap are in a direct fit.

2. The secondary fuse as described in claim 1, wherein the number of fuse elements is two.

3. The secondary fuse as described in claim 1 or 2, wherein the cavity is filled with an arc-extinguishing material that covers the fuse element within the cavity.

4. A secondary fuse as described in claim 1 or 2, wherein the fuse element has a plurality of consecutive necks.

5. The secondary fuse as described in claim 3, wherein the fuse element has a plurality of consecutive necks.

6. The secondary fuse as described in claim 1 or 2, wherein the end face of each of the outer caps is provided with an outwardly extending U-shaped locking portion.

7. The secondary fuse as described in claim 3, wherein each of the outer caps has an outwardly extending U-shaped locking portion on its end face.

8. The secondary fuse as described in claim 5, wherein each of the outer caps has an outwardly extending U-shaped locking portion on its end face.

9. The secondary fuse as described in claim 1 or 2, wherein a through hole is formed at each end of the body, each inner cap has a through hole, each through hole is aligned with the corresponding through hole of the body, and the clamping end extends out of the two through holes of the insulating body and the through hole of the inner cap before being bent.

10. The secondary fuse as described in claim 8, wherein a through hole is formed at each end of the body, each inner cap has a through hole, each through hole is aligned with the corresponding through hole of the body, and the clamping end extends out of the two through holes of the insulating body and the through hole of the inner cap before being bent.

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