EXPLOSION HAZARD SIGNALLING DEVICE Russian patent published in 1997 - IPC

FIELD: pneumoautomatics, spark-type explosion hazard signalling devices. SUBSTANCE: signalling device includes explosion chamber 1 with spark generator 2 inside it and three fire barriers 3. First and second of said fire barriers provide communication of explosion chamber 1 with discharge initiator 4 and explosion detector 5 arranged at output of explosion chamber 1. Apparatus also includes combustible gas meter having accumulator 6 connected in series with pressure stabilizer 7 and pulsating vessel 8 with two pairs of control valves 9-10 and 11 -12. Working cavity 8x of pulsating vessel 8 by means of first pair of control valves is joined at one side with pressure stabilizer 7 and at other side with explosion chamber through third fire barrier 3. Control cavity 8y of pulsating chamber through second pair of control valves 11-12 is joined at one side with output of pressure stabilizer and at other side through third fire barrier 3 with explosion chamber 1. EFFECT: enlarged using range due to portable variant of device, enhanced reliability due to increased accuracy of metering combustible gas and fixed state of detector float after explosion. 1 dwg