FR2625582A1 - FIRE DETECTION DEVICE - Google Patents

Abstract

The fire detection device comprises a smoke detector 12 housed in a chamber 13, into which opens an inlet duct 11 provided with a dust filter 10. Detection of fires in silos.

Description

Device, fire detection.

  The present invention relates to fire detection devices, comprising a smoke detector

or combustion qaz.

  The thermal probes currently used,

  even employed in large numbers, do not give information

  at the moment when the fire took such

  portions that the action of struggle becomes problematic,

  or even impossible. To be effective, a detection system

  the first phenomena caused by an incipient fire, that is to say the appearance of aerosols and fumes,

  before flame and heat appear.

  The invention enables the early detection of

  even those born in a world where

  atmospheric conditions and the effects of pollution are

  very unfavorable to common smoke detectors.

  According to the invention, the fire detection device comprises a smoke detector housed in a chamber in which an inlet duct opens with

a dust filter.

  Preferably, the filter refuses particles that do not correspond to a phenomenon originating from a fire and in particular greater than 25 microns. Since, in general, the smoke particles have a size of between 0.1 and 20 microns, the detector detects the smoke well and can be very efficiently controlled.

  parasites due to the detection of larger dust.

dimension being eliminated.

  Preferably, a humidity condenser is mounted upstream of the dust filter. This condenser removes water and moisture from the gas that would pass into the smoke detector and interfere with detector operation

of smoke.

  Advantageously, a coarse particle filter is mounted at the outlet of the inlet duct opening into

  a silo or other facility to be protected from

  cen. This filter removes coarse particles that

  would foul the filter and the detector.

  Advantageously, a stream of gas is sent on the coarse particle filter, against the current and

  intermittently, in order to periodically decompose it.

  An aspiration system, for example an electro-aspirator

  in the room where the detector is located

  and ensures the circulation of a current of air containing possibly

  smoke, from the room to be watched in the room

  in which is the smoke detector.

  The invention also relates to a method for detecting

  fire with a smoke or gas detector

  bustion characterized in that it consists of sending to the smoke detector a stream of air from the room to be protected from

  fire, but cleared of dust of a larger size.

  less than 25 microns and / or humidity.

  The single figure of the appended drawing is a diagram illustrating

  the detection device according to the invention.

  Air from a room to be protected from the fire is taken by two filters 1 and is brought

262S582

  by ducts 2, which meet in a conduit 3, to a condenser 4. The condenser consists of a cold compartment 5, cooled by a coolant, and a hot compartment 6. The compartments 5 and 6 communicate through a passage 7. From the bottom of the compartment, a U-shaped can beak 8, at the bottom of which recovers

  condensed water. A conduit 9 leads from the bottom of

  6 to a dust filter 10 which eliminates the

  particles having a size greater than 25 microns.

  A conduit 11 leads the air, rid of particles

  coarse dust and moisture, in a

  conventional flue gas or flue gas collector 12 mounted in a chamber 13, at the top of which is

provided an electro-vacuum 14.

  The detector is connected to an electrical system

  signaling, which is not represented.

  A conduit 15 sends compressed air at 8 bar, from a source 16 of compressed air, to two nozzles 17 mounted under the filters 1, so as to be able to

  unclog. This air circuit is operated

  award winning intermittent declogging, for example

15 seconds every hour.

Claims (7)

  A fire detection device comprising a smoke or combustion gas detector, characterized   in that the detector is housed in a chamber in the   which opens an inlet duct equipped with a dust filter.   2. Device according to claim 1, characterized   in that the filter refuses the dust having a   dimension greater than 25 microns.   3. Device according to claim 1, characterized   controlled by a moisture condenser mounted on the con-   inlet duct upstream of the dust filter.   4. Device according to claim 3, characterized   tered by a coarse particle filter mounted at the output of the inlet duct.   5. Device according to claim 4, characterized   by intermittently projecting means and countercurrently a fluid on the coarse particle filter.   6. Device according to one of the claims   preceding, characterized by a suction system in bedroom.   7. A method of detecting a fire with a smoke or combustion gas detector, characterized in that it consists in sending to the smoke or combustion gas detector, a stream of air coming from the   room to be protected from the fire, but freed from   with a size greater than 25 microns and / or humidity.