Porous inlay for fuse housing

Patent metadata

Field	Value
Publication number	US-9607799-B2
Application number	US-201514716268-A
Country	US
Kind code	B2
Filing date	May 19, 2015
Priority date	May 22, 2014
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A fuse may include a housing having a cavity. The fuse may also include a fuse element disposed within the cavity; a plurality of terminals extending out of the housing and electrically connected to the fuse element; and porous material disposed in the cavity adjacent to the fuse element, the porous material having a plurality of pores, the porous material further comprising an open pore structure wherein at least some of the pores are disposed on an outer surface of the porous material facing the fuse element.

First claim

The invention claimed is:

1. A fuse, comprising:
a housing having a cavity;
a fuse element disposed within the cavity;
a plurality of terminals extending out of the housing and electrically connected to the fuse element; and
porous material disposed in the cavity, the porous material having a plurality of pores, the porous material further comprising an open pore structure wherein at least some of the pores are disposed on an outer surface of the porous material facing the fuse element;
wherein the housing comprises a plurality of ribs engaging the porous material, wherein the porous material is in a compressed state when the fuse is assembled.

2. The fuse of claim 1 , wherein the porous material catches vaporized material of the fuse element.

3. The fuse of claim 1 , wherein the porous material is silicone foam.

4. The fuse of claim 1 , wherein the porous material is disposed above and below the fuse element.

5. The fuse of claim 1 , wherein the porous material comprises a pore size of between five micrometers and five millimeters.

6. The fuse of claim 1 , wherein the plurality of ribs define a box having a first size, wherein the porous material has a second size in an uncompressed state greater than the first size.

7. The fuse of claim 1 , wherein the housing centers the porous material about the fuse element.

8. The fuse of claim 1 , wherein the plurality of terminals includes a first terminal and a second terminal, and wherein the porous material is spaced apart from the first terminal and the second terminal.

9. The fuse of claim 1 , wherein the housing comprises a first portion and a second portion, wherein at least one of the first portion and the second portion includes an alignment component coupling the first portion and the second portion to one another.

10. The fuse of claim 1 , wherein the porous material comprises a hole facing the fuse element.

11. The fuse of claim 1 , wherein the porous material is spaced apart from the fuse element.

12. A method of forming a fuse, comprising:
providing a fuse structure comprising a fuse element and a first terminal and a second terminal connected to the fuse element;
providing a first housing part and a second housing part;

providing a porous material between the fuse element and at least one of the first housing part and the second housing part; and
assembling the first housing part to the second housing part, wherein the first housing part and the second housing part define a cavity retaining the porous material, the porous material having a plurality of pores, the porous material further comprising an open pore structure wherein at least some of the pores are disposed on an outer surface of the porous material facing the fuse element;
wherein at least one of the first housing part and the second housing part comprises a plurality of ribs, wherein the assembling comprises compressing the porous material against the plurality of ribs.

13. The method of claim 12 , wherein the first housing part defines a first cavity region retaining a first piece of the porous material, and wherein the second housing part defines a second cavity region retaining a second piece of porous material.

14. The method of claim 12 , wherein providing the porous material comprises attaching the porous material to an inner surface of at least one of the first housing part and the second housing part.

15. The method of claim 14 , wherein the porous material comprises silicone foam and the attaching comprises gluing the silicone foam to the inner surface.

16. The method of claim 12 , wherein the porous material comprises a flexible material having a first size in an uncompressed state, and wherein the assembling comprises creating a second size for the cavity less than the first size, wherein the porous material is retained in the cavity in a compressed state.

17. A fuse, comprising:
a fuse element;
a first terminal connected to a first portion of the fuse element;
a second terminal connected to a second portion of the fuse element;
a housing defining a first cavity region disposed on a first side of the fuse element and a second cavity region disposed on a second side of the fuse element opposite the first side;
a first porous piece disposed in the first cavity region; and
a second porous piece disposed in the second cavity region, the first porous piece and the second porous piece comprising a plurality of pores having an open pore structure wherein at least some pores are disposed on a first outer surface of the first porous piece and the second outer surface of the second porous piece, the first outer surface and the second outer surface facing the fuse element;
wherein the housing comprises a plurality of ribs engaging the first porous piece in the first cavity region and the second porous piece in the second cavity region, wherein the first porous piece and the second porous piece are in a compressed state when the fuse is assembled.

Assignees

• Littelfuse Inc

Inventors

• Schmidt Florian
• Hofmann Michael
• Jung Pascal

Classifications

• H01H85/38

  Means for extinguishing or suppressing arc (by powder filling H01H85/18; by mechanical tension applied to fusible member H01H85/36) · CPC title

• Y10T29/49108

  Electric battery cell making · CPC title

• H01H2085/383

  with insulating stationary parts · CPC title

• H01H85/1755 Primary

  composite casing · CPC title

• H01H2085/388

  using special materials · CPC title