Temperature threshold overshoot detecting device for e.g. aircraft's turbojet engine, has helical spring to contact with or separated from bottom based on temperature greater or lesser than transition temperature of shape memory material

摘要

The device has an electroconductive element i.e. helical spring (32) subjected to a temperature to be controlled, where the element is made of shape memory material. The spring contacts with or separated from an electroconductive bottom (20) of a tube (12) serving as an electric current passage terminal, according to a temperature greater or lesser than a transition temperature of the material. The bottom is connected to an electric wire (18) of a current source and the element is connected to a connecting rod (26) of the source. The element forms a micro-switch (10) of signaling circuit.