US 5,750,927 AGranted

Fire protection arrangement for temperature-sensitive, heat-producing article

OwnerOsni Baltazarinventor

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Abstract

A temperature-sensitive, heat-producing article, such as an electric cable, is fire protected by a multi-layered, thin, light weight, and vented arrangement with enhanced low-temperature heat dissipation during normal operation and effective high-temperature heat blocking during a fire. It includes a. an inner layer of heat blocking material chosen from the class of reactive endothermic materials (14), b. a vented, thin, multilayered heat screen (10), c. a gap producing spacer (12), and d. in combination, enhanced conductive, convective, and radiating elements for heat dissipation at low temperatures (11, 12, 41, and 44). The screen (10) includes a plurality of alternating layers of porous, ultra-thin, high-temperature, non-wicking insulating fiber cloths, and high-temperature heat-reflecting metallic porous foils with a layer of metallic wire cloth on the outside, i.e, the side facing the fire. The inner side of the screen (10) is held separated from inner layer (14) by a gap-forming crimped metallic wire cloth (12). The inner layer (14) encloses and is in contact with the protected article (18). The outermost layer, a wire cloth, is connected, through the layers of the heat screen, to the metallic spacer by a plurality of heat conducting wire segments, establishing a heat dissipation path designed to disintegrate during a fire.

Claims35

Dependent claims

A fire-protection arrangement having a temperature-sensitive, heat-producing article, comprising:

(a) an inner layer of an active endothermic material heat barrier for enclosing and contacting said temperature-sensitive, heat-producing article,
(b) a multi-layered, vented, flexible, low-temperature heat-dissipating, high-temperature heat-blocking fire shield enclosing said inner layer, said fire shield comprising:
(1) a vented heat screen of sheet materials forming an external surface constituting a fire side of said heat screen and an opposite surface constituting an internal side of said heat screen,
(2) a spacer producing a vented gap between said screen and said inner layer, said spacer comprising a three-dimensional lattice layer, said spacer being located between said heat screen and said inner layer at said internal side of said heat screen, and,
(3) heat-conductive means for dissipating low-temperature internal heat through said gap and said heat screen to surroundings, said heat conductive means having a plurality of heat-conducting materials forming a heat conducting path for said internal heat between said inner layer and said external surface of said heat screen,
(4) heat-convective means for dissipating low temperature internal heat through said gap and said heat screen to said surroundings, said heat-convective means comprising venting means for said heat screen for allowing air to circulate, by natural convection, from said surroundings to a surface of said inner layer, through said fire shield and back to said surroundings, and
(5) heat-emissive means for dissipating low temperature internal heat to said surroundings, said heat emissive means comprising a heat-emissive material forming said external surface of said heat screen.

4 more elements

Dependencies are inferred from the claim text.