Double temperature alarming irrecoverable type line type temperature-sensing detector

Abstract

The wire-type non-restored two-temperature-alarming heat-sensing detector realizes two-grade fixed-temperature alarming and outputting of short-circuit break-circuit fault and the cut-off fault of a micro-computer modulator. Two ends of a heat-sensing cable are connected respectively with the micro-computer modulator and a terminal resistor to form a closed-circuit signal collection circuit. It is characterized in that the structure of the cable is three elastic metal conductors in which one is coated with an insulation material layer whose Vicat softening point is between 40-180 degree C, which can also be coated with or no aluminium-plastic or copper-plastic composite band or metal foil or conductive material layer, the other is coated with an insulation layer whose Vicat softening point is between 40-180 degree C and coated again with aluminium-plastic or copper-plastic composite band or metal foil or conductive material layer. The two conductor wires with same coatings or different coatings are twisted or wound together with a third conductor wire coated with a semi-conductor material layer and an external jacket is extruded on at same. The twisting or winding pitch of the three wires is optimized between 20mm-200mm.

Description

technical field [0001] The invention relates to a fire alarm device, which is a dual-temperature alarm non-recoverable linear temperature-sensitive detector. technical background [0002] The linear temperature-sensitive fire detector in the prior art is a fire detector with a wide range of uses. The linear temperature-sensitive detector currently used is: a multi-level alarm switching value linear temperature-sensitive detector, see Figure 1, In the detector, there is an outer sheath 14, and the two elastic conductors 11 in the sheath are respectively covered with plastic layers 12 with different melting points and conductor wrapping layers 13, and twisted together. When the temperature of the cable of the detector rises to the melting point of the plastic layer 12 and then softens or melts, the elastic conductor 11 contacts with the plastic layer 12 or the conductor wrapping layer 13 respectively under the action of the elastic force, and two short circuits occur, thereby ...

AI Technical Summary

Problems solved by technology

The disadvantage is that when the detector is short-circuited by accidents such as mechanical extrusion or rat bites, the detector also outputs an alarm signal, which cannot distinguish between short-circuit, open circuit, and microcomputer modulator power-off fault output.

Images