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US 11,348,754 B2Granted
Aluminum alloy miniature cartridge fuses
AssigneeEaton Intelligent Power Limited
InventorsRamdev Kanapady, Hui Calvin Yang, Gang Duren Huang, Nicholas Stone
Life of this patent
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Abstract
A high-capacity miniature cartridge fuse is provided. A fuse includes a cylindrical housing, a fusible wire, and first and second deep-drawn ferrules fabricated from aluminum alloy. The aluminum is plated with nickel. The ferrule includes a side wall and an end wall. The side wall surrounds the first or second end of the housing, and has a thickness of approximately 0.50 mm or less. The end wall includes a boss extending toward an interior of the housing, and has a thickness greater than the thickness of the side wall.
Claims18
A high-capacity miniature cartridge fuse comprising:
- a cylindrical housing having opposing first and second ends;
- a fusible element positioned inside the cylindrical housing and including opposing first and second ends;
- and
- first and second deep-drawn ferrules fabricated from aluminum alloy, the aluminum alloy ferrules fabricated to withstand high pressure generated inside the cylindrical housing as a result of arcing and to stay in place after repeated temperature and pressure changes caused by at least one of i) current or ii) arcing during short circuit events, wherein the first and second ferrules are respectively attached to the first and second ends of the cylindrical housing and electrically connected to the respective first and second ends of the fusible element, the aluminum alloy being plated with nickel, each of the first and second ferrules comprising:
- a side wall surrounding the first or second end of the cylindrical housing, wherein the side wall has a thickness of approximately 0.50 mm or less;
- and
- an end wall extending from the side wall and closing the first or second end of the cylindrical housing, wherein the end wall includes a boss extending toward an interior of the cylindrical housing and defining an interior surface of the end wall, and the end wall has a thickness greater than a thickness of the side wall,
- wherein the side wall and the end wall define an interior receptacle that is sized to receive the first or second end of the cylindrical housing,
- wherein the fuse is configured as a time delay fuse, and the aluminum alloy has a thermal conductivity of approximately 125 W/m·K or lower and an electrical resistivity of approximately 5.32×10−6 Ω-cm or higher.
6 more elements
A method of fabricating a high capacity miniature cartridge fuse, the method comprising:
- providing a cylindrical housing, wherein the cylindrical housing comprises opposing first and second ends;
- providing a sheet of aluminum alloy;
- constructing a ferrule from the sheet of aluminum alloy by a drawn process, wherein the ferrule comprises a side wall and an end wall extending from the side wall, the side wall and the end wall define an interior receptacle that is sized to receive the first or second end of the cylindrical housing, the side wall has a thickness of approximately 0.50 mm or less, the end wall comprises a boss extending from the end wall in the same direction as the side wall and defining an interior surface of the end wall, and the end wall has a thickness greater than a thickness of the side wall, the aluminum alloy ferrule fabricated to withstand high pressure generated inside the cylindrical housing and stay in place after repeated temperature and pressure changes caused by at least one of i) current or ii) arcing during short circuit events;
- plating the ferrule with nickel;
- inserting a fusible wire inside the cylindrical housing, wherein the fusible wire comprises opposing first and second ends;
- inserting the first or second end of the fusible wire through an eyelet;
- turning the first or second end of the fusible wire away from a body of the fusible wire;
- inserting the first or second end of the cylindrical housing of the fuse into the interior receptacle of the ferrule such that the first or second end of the fusible wire is held between a portion of the eyelet and the end wall of the ferrule;
- and
- securing the ferrule onto the cylindrical housing by clamping the ferrule around the first or second end of the cylindrical housing,
- wherein the fuse is configured as a time delay fuse, and the aluminum alloy has a thermal conductivity of approximately 125 W/m·K or lower and an electrical resistivity of approximately 5.32×10−6 Ω-cm or higher.
8 more elements
Dependencies are inferred from the claim text.