Fire resistant radiating coaxial cable
AssigneeAmerican Fire Wire, Inc.
InventorWilliam E. Rogers
Life of this patent
Estimating the term…
Abstract
A fire resistant radiating coaxial cable that employs a high-silica fiberglass yarn spacer is described. The yarn material has mass fraction of silica (SiO2) between 95.0% and 96.5%, a mass fraction of aluminum oxide (Al2O3) greater than 3%, and a mass fraction of calcium oxide (CaO) less than 0.5%. The yarn can be wound in a low-helix-angle helix around the center conductor such that less than half fills the annular space between it and the outer conductor. The cable is configured to maintain a relatively coaxial relation between a center conductor and an outer conductor under intense fire conditions.
Claims20
A fire resistant radiating coaxial cable apparatus comprising:
- a center conductor;
- an outer conductor having a circumference with apertures, the outer conductor surrounding the center conductor;
- and
- a high silica fiberglass yarn between the center conductor and the outer conductor, the fiberglass yarn having a mass fraction of silica (SiO2) between 95.0% and 96.5%, a mass fraction of aluminum oxide (Al2O3) greater than 3%, and a mass fraction of calcium oxide (CaO) less than 0.5%, the fiberglass yarn being configured to maintain a predetermined dielectric spacing between the center conductor and the outer conductor when exposed to heat at or above 1010° C.
A fire resistant coaxial cable apparatus comprising:
- a center conductor;
- an outer conductor surrounding the center conductor;
- and
- a high silica fiberglass yarn wrapped in a helix between the center conductor and the outer conductor, the fiberglass yarn having a mass fraction of silica (SiO2) between 95.0% and 96.5%, a mass fraction of aluminum oxide (Al2O3) greater than 3%, and a mass fraction of calcium oxide (CaO) less than 0.5%, the fiberglass yarn being configured to maintain a predetermined dielectric spacing between the center conductor and the outer conductor when exposed to heat at or above 1010° C.,
- wherein the fiberglass yarn fills less than half of a volume between the center conductor and the outer conductor.
A method of manufacturing a fire resistant coaxial cable, the method comprising:
- wrapping a center conductor with a helix of high silica fiberglass yarn, the fiberglass yarn having a mass fraction of silica (SiO2) between 95.0% and 96.5%, a mass fraction of aluminum oxide (Al2O3) greater than 3%, and a mass fraction of calcium oxide (CaO) less than 0.5%;
- and
- surrounding the fiberglass yarn and center conductor with an outer conductor, wherein the fiberglass yarn is configured to maintain a predetermined dielectric spacing between the center conductor and the outer conductor when exposed to heat at or above 1010° C.
Dependencies are inferred from the claim text.