AUTONOMOUS FIRE-EXTINGUISHING AND ALARM SYSTEM Russian patent published in 2005 - IPC

FIELD: fire-fighting equipment.

SUBSTANCE: system has heat-sensitive members made of thermomechanical shape memory material and is provided with two pairs of constant magnets connected by like poles. Each constant magnet pair is located in corresponding case and secured to rod loaded towards magnets and having head. Each constant magnet pair is adapted to cooperate with corresponding inductance coil installed on magnetic conductive support and with reed switch assemblies. Each reed switch assembly is located so that reed switches thereof are under the influence of respective constant magnet pair. Each normally opened contact of the first and the second reed switches of the first assembly is connected with one contact of inductive coil of the second constant magnet pair. Each normally opened contact of the first and the second reed switches of the second assembly is connected with one contact of inductive coil of the first constant magnet pair. Outputs of the first and the second reel switches are in pairs connected to fire-extinguisher contacts. Each the third reel switch of above assemblies is in-circuit with one stub through normally closed contact and reel switch output. Each heat-sensitive member is installed in corresponding case and is adapted to release rod head.

EFFECT: prevention of false actuation.

13 cl, 3 dwg