Fuse having an explosion chamber

Patent metadata

Field	Value
Publication number	US-9953783-B2
Application number	US-201615154901-A
Country	US
Kind code	B2
Filing date	May 13, 2016
Priority date	May 13, 2015
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

Embodiments disclose a fuse comprising a one power lead, an explosion chamber and an isolating chamber, wherein the fuse is designed such that a power lead can be broken into at least two parts by an explosion triggered in an explosion chamber. The two parts are separated from each other in an associated isolating chamber by a respective electrically insulating partition. Embodiments disclose a method comprising a power lead, an explosion chamber and an isolating chamber, wherein an explosion is triggered in the explosion chamber so that the power lead is broken into at least two parts and bent into the isolating chamber such that at least two parts are separated from one another by an electrically insulating partition. The present disclosure can be applied to pyrotechnic fuses for vehicles and to high-voltage fuses.

First claim

What is claimed is:

1. A fuse for causing a break in a power lead, wherein the power lead has a predetermined breaking point along a length of the power lead, the fuse comprising:
an explosion chamber for triggering an explosion configured to cause a break in the power lead at the predetermined breaking point, the explosion chamber having first and second explosion chamber walls across which the power lead extends;
an isolating chamber having first and second isolating chamber walls across which the power lead extends, such that a fuse portion of the power lead extends between a first location of the first isolating chamber wall and a second location of the second isolating chamber wall, and wherein the fuse portion of the power lead includes the predetermined breaking point, and wherein the fuse portion of the power lead forms a wall that substantially isolates the isolating chamber from the explosion chamber prior to the explosion triggered in the explosion chamber; and
an electrically insulating partition extending, from a bottom of the isolating chamber, toward the power lead, such that a distal end of the partition is spaced from the power lead;
wherein:
the power lead is configured to break into at least first and second parts at the predetermined breaking point by the explosion triggered in the explosion chamber, the first and second parts configured to bend at about the first and second locations, respectively, of the first and second isolating chamber walls, and
the electrically insulating partition is configured to keep the first and second parts of the power lead electrically isolated from each other in the isolating chamber.

2. The fuse according to claim 1 , wherein the electrically insulating partition is positioned within the isolating chamber.

3. The fuse according to claim 1 , wherein the power lead is configured to break at only the predetermined breaking point into exactly two parts, and the fuse includes exactly one electrically insulating partition for the power lead.

4. The fuse according to claim 1 , further comprising:
a magnet for providing a magnetic field configured to suppress formation of an arc between the first and second parts.

5. A method for operating a fuse comprising at least one power lead, an explosion chamber, and an isolating chamber having first and second isolating chamber walls across which the power lead extends, such that a fuse portion of the power lead extends between a first location of the first isolating chamber wall and a second location of the second isolating chamber wall, wherein the fuse portion of the power lead forms a wall that substantially isolates the isolating chamber from the explosion chamber prior to an explosion triggered in the explosion chamber, wherein the method comprises:
deforming the power lead by an application of pressure when the explosion is triggered in the explosion chamber;
separating the power lead into at least first and second parts at a predetermined breaking point;
bending each separated part at about the first and second locations, respectively, of the first and second isolating chamber walls towards a different side of an electrically insulating partition that extends from a bottom of the isolating chamber; and
isolating the bent parts from each other by the partition, wherein a distal end of the partition is spaced from the power lead.

6. The method according to claim 5 , wherein the electrically insulating partition is located in the isolating chamber.

7. A high-voltage pyrofuse for causing a break in a power lead, wherein the power lead has a predetermined breaking point along a length of the power lead, the fuse comprising:
an explosion chamber for triggering an explosion configured to cause a break in the power lead at the predetermined breaking point, the explosion chamber having first and second explosion chamber walls through which the power lead extends;
an isolating chamber having first and second isolating chamber walls through which the power lead extends, such that a fuse portion of the power lead extends between a first location of the first isolating chamber wall and a second location of the second isolating chamber wall, and wherein the fuse portion of the power lead includes the predetermined breaking point, and wherein the fuse portion of the power lead forms a wall that substantially isolates the isolating chamber from the explosion chamber prior to the explosion triggered in the explosion chamber; and
an electrically insulating partition extending, from a bottom of the isolating chamber, toward the power lead, such that a distal end of the partition is spaced from the power lead;
wherein:
the power lead is configured to break into at least first and second parts at the predetermined breaking point by the explosion triggered in the explosion chamber, the first and second parts configured to bend at about the first and second locations, respectively, of the first and second explosion chamber walls, and
the electrically insulating partition is configured to isolate the first and second parts from each other.

8. The pyrofuse according to claim 7 , wherein:
the electrically insulating partition is positioned within the isolating chamber.

9. The pyrofuse according to claim 7 , further comprising:
a magnet for providing a magnetic field configured to suppress formation of an arc between the first and second parts.

Assignees

• Draexlmaier Lisa Gmbh

Inventors

• Fellmer Marko
• Gruber Christian
• Faltermeier Peter

Classifications

• H01H9/34

  Stationary parts for restricting or subdividing the arc, e.g. barrier plate · CPC title

• H01H39/006 Primary

  Opening by severing a conductor · CPC title

• H01H9/443

  using permanent magnets · CPC title

• H01H33/182

  using permanent magnets (H01H33/187 takes precedence) · CPC title