| 摘要 |
FIELD: fire-fighting equipment, particularly to protect pipelines, storage and transportation systems for inflammable and explosive materials against fire. ^ SUBSTANCE: fire barrier comprises hollow cylindrical body made of non-magnetic material and closed by end cap, inlet connection pipe coaxially arranged in the first end cap, magnet with through axial channel secured inside body near the first end cap coaxially to inlet connection pipe, cylindrical valve pressed to magnet by spring and having magnetic properties. Magnetic field of cylindrical valve is directed towards magnetic field of magnet. Fire barrier also has two outlet connection pipes connected to side wall of barrier body so that one outlet connection pipe is arranged near magnet adjoining the first end cap and is closed by side surface of cylindrical valve. The second outlet connection pipe is located near the second end cap and may be closed by side surface of cylindrical valve after cylindrical valve displacement up to reaching the second end cap. Fire barrier comprises heat sensitive member formed of ferromagnetic material with predetermined Curie point and heater installed on outer body surface coaxially to heat sensitive member. Heat sensitive member is formed as coating applied on magnet. Spring of shape memory material is arranged in magnet channel and has shape recovery temperature equal or close to Curie point of heat-sensitive member material. Shape-memory spring length under temperature below shape recovery temperature exceeds that of axial magnet channel by value not less than path of valve travel to the second end cap. Shape-memory spring in its compressed state abuts the first end cap by the first end thereof and presses against cylindrical valve by the second end thereof. Diameter of shape-memory spring and diameter of axial magnet channel exceed diameter of valve axial channel and inner diameter of inlet connection pipe. ^ EFFECT: increased reliability due to improved ability of valve movement and fixation for pipeline closing in emergency conditions. ^ 2 cl, 2 dwg
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