High-current fuse with endbell assembly

Patent metadata

Field	Value
Publication number	US-10483069-B2
Application number	US-201916246515-A
Country	US
Kind code	B2
Filing date	Jan 13, 2019
Priority date	Nov 14, 2014
Publication date	Nov 19, 2019
Grant date	Nov 19, 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 method of manufacturing a fuse comprising:
providing a fuse element having a first end and a second end, a first terminal electrically connected to the first end and a second terminal electrically connected to the second end;
coupling a first endbell to the first end of the fuse element and coupling a second endbell to the second end of 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;
inserting the fuse element into a hollow fuse tube having an inner cavity and at least two fuse body apertures formed therethrough, the first and second O-ring seals engaging an interior of the hollow fuse tube;
filling the hollow fuse tube with an amount of arc quenching material; and
fastening end caps onto ends of the hollow fuse tube;
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 method of claim 1 , further including injecting, via the at least two fuse body apertures, an adhesive into one of the at least two grooves in each of the first and second endbells that does not contain an O-ring seal to adhere the first and second endbells to the hollow fuse tube.

3. The method 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 hollow fuse tube 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 method of claim 1 , wherein the grooves in which the O-ring seals are disposed have widths that are greater than widths of the O-ring seals disposed within them, the method further comprising injecting, via the at least two fuse body apertures, an adhesive into the grooves in which the O-ring seals are disposed such that the adhesive fills unoccupied areas of the grooves around the O-ring seals.

5. The method 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.

6. The method of claim 5 , 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.

7. The method of claim 5 , further comprising injecting the first endbell and the second endbell with the arc quenching material doped with a dielectric gel.

8. The method of claim 1 , further comprising securing the first endbell to the fuse body by injecting the adhesive in the other of the at least two grooves, wherein a first double seal is formed between the fuse body and the first endbell by the first O-ring seal and the adhesive.

9. The method of claim 8 , further comprising securing the second endbell to the fuse body by injecting the adhesive in the other of the at least two grooves, wherein a second double seal is formed between the fuse body and second endbell by the second O-ring seal and the adhesive.

10. The method of claim 1 , further comprising engaging the first and second O-ring seals with an interior of the fuse body, and providing seals intermediate the first and second endbells and the fuse body.

11. The method of claim 1 , further comprising attaching a first endbell section to a second endbell section to form the first endbell.

12. The method of claim 11 , further comprising attaching a third endbell section to a fourth endbell section to form the second endbell.

Assignees

• Littelfuse Inc

Inventors

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

Classifications

• Y10T29/49107

  Fuse making · CPC title

• H01H85/042 Primary

  General constructions or structure of high voltage fuses, i.e. above 1000 V · CPC title

• H01H85/08

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

• H01H85/18

  Casing fillings, e.g. powder · CPC title

• H01H85/147

  Parallel-side contacts · CPC title