Inner chambers with blast attenuation geometry on fuses

Patent metadata

Field	Value
Publication number	US-11984286-B2
Application number	US-202217880121-A
Country	US
Kind code	B2
Filing date	Aug 3, 2022
Priority date	Aug 3, 2022
Publication date	May 14, 2024
Grant date	May 14, 2024

Abstract

A fuse includes multiple stacked layers, a first terminal, and a second terminal. The first terminal is connected to one end of a fusible element and the second terminal is connected to the other end. The stacked layers include first and second intermediate layers and a special layer. The first intermediate layer, which has a centrally disposed opening, is stacked on the first terminal and the second terminal. The second intermediate layer, also having a centrally disposed opening is stacked above the first intermediate layer, and the centrally disposed openings define a chamber above the fusible element. The special layer is located between the first intermediate layer and the second intermediate layer and includes one or more geometric elements. The geometric elements divide the chamber into two sub-chambers, the first sub-chamber being above the second sub-chamber.

First claim

The invention claimed is:

1. A fuse comprising:
a fusible element;
a first terminal coupled to a first end of the fusible element;
a second terminal coupled to a second end of the fusible element; and
a plurality of stacked layers comprising:
a first intermediate layer stacked upon the first terminal and the second terminal, the first intermediate layer having a centrally disposed opening;
a second intermediate layer stacked upon the first intermediate layer, the second intermediate layer having a centrally disposed opening, wherein the centrally disposed openings of the first intermediate layer and the second intermediate layer define a first chamber above the fusible element; and
a first special layer disposed between the first intermediate later and the second intermediate layer, the first special layer dividing the first chamber into a first sub-chamber and a second sub-chamber, wherein the first special layer comprises one or more geometric blockages between the first sub-chamber and the second sub-chamber to at least partially define a first wall between the first sub-chamber and the second sub-chamber, and wherein the first special layer comprises one or more openings in the first wall to define one or more pathways between the first sub-chamber and the second sub-chamber.

2. The fuse of claim 1 , the plurality of stacked layers further comprising:
a third intermediate layer stacked below the first terminal and the second terminal, the third intermediate layer having a centrally disposed opening; and
a fourth intermediate layer beneath the third intermediate layer, the fourth intermediate layer having a centrally disposed opening, wherein the centrally disposed openings of the third intermediate layer and the fourth intermediate layer define a second chamber below the fusible element.

3. The fuse of claim 2 , the plurality of stacked layers further comprising a second special layer disposed between the third intermediate layer and the fourth intermediate layer, the second special layer dividing the second chamber into a third sub-chamber and a fourth sub-chamber, wherein the second special layer includes one or more geometric blockages between the third sub-chamber and the fourth sub-chamber to at least partially define a second wall between the third sub-chamber and the fourth sub-chamber, and wherein the second special layer includes one or more openings in the second wall to define one or more pathways between the third sub-chamber and the fourth sub-chamber.

4. The fuse of claim 3 , wherein the one or more geometric blockages of the second special layer are the same as the one or more geometric blockages of the first special layer.

5. The fuse of claim 3 , wherein the one or more geometric blockages of the second special layer are different from the one or more geometric blockages of the first special layer.

6. The fuse of claim 1 , wherein the one or more openings in the first wall comprise a plurality of holes located along a center line of the first special layer.

7. The fuse of claim 6 , wherein the plurality of holes comprises three holes.

8. The fuse of claim 6 , wherein the plurality of holes comprises five holes.

9. The fuse of claim 1 , wherein the one or more geometric blockages comprise a plurality of horizontally disposed rectangles located along a center line of the first special layer.

10. The fuse of claim 9 , wherein the one or more geometric blockages further comprise a second horizontally disposed rectangle at a first end of the plurality of horizontally disposed rectangles and a third horizontally disposed rectangle at a second end of the plurality of horizontally disposed rectangles, the second horizontally disposed rectangle being larger than any one of the plurality of horizontally disposed rectangles.

11. The fuse of claim 1 , wherein the one or more geometric blockages comprise a plurality of vertically disposed rectangles located between a plurality of rivet holes.

12. A fuse comprising:
a fusible element coupled between two terminals;
a first intermediate layer comprising a rectangular plate with a centrally disposed cutout;
a second intermediate layer comprising a first rectangular plate with a centrally disposed cutout, wherein the fusible element is sandwiched between the first intermediate layer and the second intermediate layer, the first intermediate layer defining a first chamber above the fusible element and the second intermediate layer defining a second chamber below the fusible element; and
a first special layer comprising a second rectangular plate with one or more geometric blockages and one or more openings, wherein the first special layer is stacked upon the first intermediate layer, wherein the first special layer divides the first chamber into a first sub-chamber and a second sub-chamber, wherein the one or more geometric blockages at least partially define a wall between the first sub-chamber and the second sub-chamber, and wherein the one or more openings are in the wall to define one or more pathways between the first sub-chamber and the second sub-chamber.

13. The fuse of claim 12 , further comprising a cover layer disposed above the first special layer, wherein the cover layer defines a top of the first sub-chamber.

14. The fuse of claim 13 , wherein the one or more openings comprise a hole stamped into the first special layer.

15. The fuse element of claim 13 , wherein the one or more openings comprise a rectangle stamped into the first special layer.

16. The fuse element of claim 13 , wherein the one or more openings comprise a plurality of rectangles stamped into the first special layer.

17. The fuse element of claim 13 , wherein the one or more openings comprise a plurality of holes stamped into a center line of the first special layer.

18. The fuse element of claim 14 , wherein the first intermediate layer, the second intermediate layer, the first special layer, and the cover layer are melamine.

19. The fuse element of claim 13 , further comprising a second special layer comprising a third rectangular plate with one or more geometric blockages and one or more openings, wherein the second special layer is stacked above the first special layer.

20. The fuse element of claim 19 , wherein the one or more geometric blockages of the second special layer are different from the one or more geometric blockages of the first special layer.

Assignees

• Littelfuse Inc

Inventors

• Murillo Clemente Hernandez

Classifications

• H01H85/175 Primary

  characterised by the casing shape or form · CPC title

• H01H85/17

  characterised by the casing material · CPC title

• H01H85/1755

  composite casing · CPC title

• H01H2085/0414

  Surface mounted fuses · CPC title

• H01H85/0039 Primary

  Means for influencing the rupture process of the fusible element · CPC title