High-current fuse with endbell assembly

Patent metadata

Field	Value
Publication number	US-10224166-B2
Application number	US-201615164255-A
Country	US
Kind code	B2
Filing date	May 25, 2016
Priority date	Nov 14, 2014
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

A fuse including a fuse body defining an inner cavity and having at least one fuse body aperture formed therethrough, a fuse element including a first terminal and a second terminal, a first endbell and a second endbell coupled to the fuse element, the first endbell having at least two grooves formed in a surface thereof and having a first O-ring seal disposed in at least one of the grooves, the second endbell having at least two grooves formed in a surface thereof and having a second O-ring seal disposed in at least one of the grooves, an adhesive securing the first and second endbells to the fuse body, an arc quenching material disposed within the inner cavity and contacting at least a portion of the fuse element, and end caps coupled to the fuse body, the end caps sealing a portion of the fuse element within the fuse body.

First claim

The invention claimed is:

1. A fuse, comprising:
a fuse body defining an inner cavity and having at least one fuse body aperture formed therethrough;
a fuse element including a first terminal and a second terminal, a portion of the fuse element disposed within the inner cavity, the first terminal and the second terminal extending outside of the fuse body;
a first endbell coupled to the fuse element, the first endbell having at least two grooves formed in a surface thereof and having a first O-ring seal disposed in one of the at least two grooves, and adhesive securing the first endbell to the fuse body disposed in the other of the at least two grooves, such that a first double seal is formed between the fuse body and the first endbell by the first O-ring seal and the adhesive;
a second endbell coupled to the fuse element, the second endbell having at least two grooves formed in a surface thereof and having a second O-ring seal disposed in one of the at least two grooves, and adhesive securing the second endbell to the fuse body disposed in the other of the at least two grooves, such that a second double seal is formed between the fuse body and second endbell by the second O-ring seal and the adhesive;
an arc quenching material disposed within the inner cavity, the arc quenching material contacting at least a portion of the fuse element; and
end caps coupled to the fuse body, the end caps sealing a portion of the fuse element within the fuse body;
wherein the first endbell and the second endbell are cup-shaped such that a first chamfer is formed within the first endbell and a second chamfer is formed within the second endbell.

2. The fuse of claim 1 , wherein the first and second O-ring seals engage an interior of the fuse body and provide seals intermediate the first and second endbells and the fuse body.

3. The fuse of claim 1 , wherein the at least two grooves in the first endbell include an innermost groove and an outermost groove, the innermost groove being located nearer a longitudinal center of the fuse body relative to the outermost groove, wherein the at least two grooves in the second endbell include an innermost groove and an outermost groove, the innermost groove being located nearer a longitudinal center of the fuse body relative to the outermost groove, and wherein the first and second O-ring seals are disposed within the outermost grooves of the first and second endbells.

4. The fuse of claim 1 , further comprising a first arc barrier disposed intermediate the first endbell and the arc quenching material and a second arc barrier disposed intermediate the second endbell and the arc quenching material.

5. The fuse of claim 1 , wherein the first endbell is coupled to the first terminal and the second endbell is coupled to the second terminal.

6. The fuse of claim 1 , wherein the first endbell and the second endbell each include a first endbell section and a second endbell section.

7. The fuse of claim 1 , wherein the fuse element and the first endbell and the second endbell within the fuse body form a three-zone fuse, a first zone including at least a liquid adhesive, a second zone including at least the arc quenching material, and a third zone including at least the liquid adhesive, the second zone is between the first zone and the third zone.

8. The fuse of claim 7 , wherein the first endbell is positioned in the first zone, the second endbell is positioned in the third zone, and a center element of the fuse element is positioned in the second zone, the fuse element traversing through the first zone, the second zone, and the third zone.

9. A fuse comprising:
a fuse element including a center element formed of metallic material and having a first strip and a second strip arranged in a geometric configuration, the center element further including an electrically conductive bridge interconnecting adjacent portions of the first strip and the second strip, the electrically conductive bridge electrically connecting the first strip and the second strip;
a first terminal and a second terminal coupled to the fuse element;
a first endbell and a second endbell coupled to the fuse element;
a hollow fuse tube having a first and second apertures formed therethrough, the hollow fuse tube housing a portion of the fuse element and the first and second endbells, the first endbell having a first groove formed in a surface thereof and having a first O-ring seal disposed in the first groove, the second endbell having a second groove formed in a surface thereof and having a second O-ring seal disposed in the second groove, the first and second grooves of the first and second endbells being aligned with the first and second apertures, respectively;
an arc quenching material disposed between the first endbell and the second endbell within the hollow fuse tube, the arc quenching material surrounding at least a portion of the fuse element, wherein the arc quenching material occupies less than a total volume of the hollow fuse tube; and
a first arc barrier disposed intermediate the first endbell and the arc quenching material and a second arc barrier disposed intermediate the second endbell and the arc quenching material;
wherein the first endbell and the second endbell are cup-shaped such that a first chamfer is formed within the first endbell and a second chamfer is formed within the second endbell.

10. The fuse of claim 9 , wherein the first endbell and the second endbell each include a first endbell section and a second endbell section that are coupled together.

11. The fuse of claim 9 , wherein:
the first endbell further includes a third groove disposed inward from the first groove along a longitudinal axis of the hollow fuse tube; and
the second endbell further includes a fourth groove disposed inward from the second groove along the longitudinal axis of the hollow fuse tube.

12. The fuse of claim 11 , wherein a third O-ring seal is disposed in the third groove on the first endbell, and a fourth O-ring seal is disposed in the fourth groove on the second endbell.

Assignees

• Littelfuse Inc

Inventors

• Schlaak Michael
• Stumpo Gregory
• Venhaus Ken
• Lasini Derek

Classifications

• H01H85/08

  characterised by the shape or form of the fusible member · CPC title

• H01H85/38

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

• H01H85/175

  characterised by the casing shape or form · CPC title

• Y10T29/49107

  Fuse making · CPC title

• H01H85/185

  Insulating members for supporting fusible elements inside a casing, e.g. for helically wound fusible elements · CPC title