EP0777896A1 - Device for detecting a fire in a closed-off enclosure - Google Patents
Device for detecting a fire in a closed-off enclosureInfo
- Publication number
- EP0777896A1 EP0777896A1 EP95929148A EP95929148A EP0777896A1 EP 0777896 A1 EP0777896 A1 EP 0777896A1 EP 95929148 A EP95929148 A EP 95929148A EP 95929148 A EP95929148 A EP 95929148A EP 0777896 A1 EP0777896 A1 EP 0777896A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- enclosure
- smoke
- alarm
- detectors
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/117—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means by using a detection device for specific gases, e.g. combustion products, produced by the fire
Definitions
- the present invention relates to fire detection devices and in particular a fire detection device in a closed enclosure such as a control cabinet in a workshop or a production unit in a factory.
- Such a control cabinet is generally provided with a fire detection cabinet located outside the cabinet and responsible for rapidly detecting any start of fire in the cabinet.
- the box of the type described in FR-A-2,523,455 includes a means of extracting the air from the cabinet, one or two smoke detectors responsible for analyzing the air drawn into the cabinet to detect traces of smoke and through which is forced to circulate the air sucked by the suction means before being discharged to the outside, and a control and alarm unit which generally triggers both an audible alarm and a light alarm when a start of fire is detected.
- the object of the invention is therefore to provide a fire detection device in a closed or sealed enclosure, which has a high operating reliability avoiding inadvertent triggering of the alarm while allowing detection of very minor fire outbreaks.
- the object of the invention is therefore a fire detection device in a closed enclosure such as a control cabinet, having a means of sucking the air from the enclosure which discharges the air into the enclosure after it has been continuously analyzed by a smoke detection means.
- the device includes a control and alarm unit which triggers the fire alarm. when the smoke detection means has detected traces of smoke in the air of the enclosure.
- the smoke detection means comprises a first detector receiving the air drawn in from the first air inlet ports located at first locations of the enclosure, and a second detector receiving the air drawn in from the second air ports air inlet located at second locations of the enclosure different from the first locations.
- the control and alarm unit comprises alarm means for triggering the alarm when one of the detectors has detected smoke in the air discharged into the enclosure by the suction and discharge means after that this air gave rise to smoke detection by one of the other detectors.
- FIG. 1 schematically represents the preferred embodiment of the fire detection device according to the invention
- FIG. 2 schematically represents an embodiment of the part of the control and alarm unit connected to the two fire detectors
- FIG. 3 schematically represents an enclosure having two fire detection devices corresponding respectively to the two embodiments of the invention.
- a box 10 containing the fire detection device according to the invention is placed above an enclosure 12 such as a control cabinet located in a workshop and containing the electrical and electronic circuits workshop control (not shown).
- the air from the enclosure is sucked in by the two tubes or pipes 14 and 16 by means of a suction means such as a fan 18.
- the two tubes 14 and 16 can be stopped at any height of the enclosure 12. They are pierced with calibrated orifices a, b, c for the tube 14, or d, e, f for the tube 16, responsible for taking the air in "volumes at risk", that is to say parts of the cabinet containing sensitive circuits or vital parts of all the circuits in the cabinet.
- the opening of the orifices of the tubes 14 and 16 may be different depending on the level of "risk" of the volume to be monitored.
- a control and alarm unit 24 is connected to the two smoke detectors 20 and 22.
- the alarm unit 24 has an audible alarm and / or a light alarm (not shown) which are triggered when the The unit receives information from the two smoke detectors 20 and 22 as explained below.
- this air analyzed by the smoke detector 20 causes a pre-alarm signal from the alarm unit 24.
- this pre-alarm must be confirmed because it could be a false alarm by the detector 20.
- the air which has been analyzed by the detector 20 is blown by the fan 18 in the enclosure. 12. This air is sucked in again, but this time at 16-d, 16-e or 16-f, then analyzed by the smoke detector 22.
- the information is reliable, confirmed, and can only come from an actual detection of smoke.
- the reaction time between detection by a smoke detector and its confirmation is very short, less than a few seconds.
- the enclosure includes so-called special risk zones such as zone 30, in other words high risk zones which it is good to monitor more particularly.
- this zone 30 can be connected to one or more holes 14b and 14c by one or more capillary tubes 32 and 34, so that any start of fire in the zone 30 will be very quickly detected by the smoke detector 20 and a pre-alarm signal which will be confirmed once the air containing smoke has been returned to the enclosure by the fan 18, then sucked in by the tube 16. It can therefore be seen that the device of the invention can be easily adapted to each case, without disassembly, but only by connecting capillaries in areas with particular risks.
- the control and alarm unit 24 can be presented in the manner schematically illustrated in FIG. 3.
- a contact 36 is closed, which allows a current to flow from the voltage point V into a low value resistor 38.
- the voltage at the upper terminal of the resistor 38 rises and applies to the input 40 d a comparator 42, the second input 44 of which is supplied by a voltage taken at the junction point of a fixed resistor 46 and a variable resistor 48.
- the resistor 48 is adjusted so that the voltage on the input 40 is greater than the voltage on the input 44 so that the comparator 42 provides a signal to a pre-alarm means 50 which can be light or sound.
- both the pre-alarm and the alarm can only be triggered again after being restored to their inactive state.
- the device which has just been described has the advantage of being usable independently by using a simple 24 volt DC power supply, without adding an expensive detection center. In order to be sure that the device is still in good working order, it must be ensured that the air is correctly sucked from the enclosure. It is indeed foreseeable that the openings a, b, c of the tube 14 or d, e, f of the tube 16 become partially blocked by fouling due for example to an accumulation of dust. This is why a flow detector 26 or 28 is provided at the inlet of each smoke detector.
- Each flow detector 26 or 28 is connected to one control and alarm unit 24 so that an alert signal is also triggered if the flow in one of the tubes falls below the fateful threshold.
- the control and alarm unit 24 can be equipped with all the means necessary for the commands: automatic shutdown, ventilation shutdown, anti-sabotage, burglary protection and operating safety of the detectors and the fan.
- the detection device which has just been described with reference to FIG. 1 is reversible. Indeed, it suffices to reverse the direction of rotation of the fan so that the air is sucked in from the fan 18 and blown into the enclosure by means of the tubes 14 and 16. In this case, the confirmed alarm arrives more earlier than in the previous case.
- This configuration is particularly effective if you do not want to sample air precisely in risky volumes or if the cabinet does not have parts to be monitored more particularly.
- the tubes can therefore be stopped open as soon as they enter the enclosure.
- the detection speed of the second detection device 82 comprising short tubes is added, d '' where a very high reliability of the combination of the two devices.
- the output information is connected at will according to an AND or an OR allowing all the most appropriate confirmations, timers and commands in terms of security.
- the detection device according to the invention because of its closed ventilation circuit, can therefore be used for the detection of fire in enclosures that need to be completely sealed so that the circuits located inside are completely isolated. from the outside atmosphere.
- a device is particularly suitable for use in the cabinets of clean rooms or other highly protected environments, in particular in explosion-proof cabinets and environments.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9410679 | 1994-09-01 | ||
FR9410679A FR2724247B1 (en) | 1994-09-01 | 1994-09-01 | FIRE DETECTION DEVICE IN A CLOSED ENCLOSURE |
PCT/FR1995/001134 WO1996007166A1 (en) | 1994-09-01 | 1995-08-30 | Device for detecting a fire in a closed-off enclosure |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0777896A1 true EP0777896A1 (en) | 1997-06-11 |
EP0777896B1 EP0777896B1 (en) | 1999-05-06 |
Family
ID=9466739
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95929148A Revoked EP0777896B1 (en) | 1994-09-01 | 1995-08-30 | Device for detecting a fire in a closed-off enclosure |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0777896B1 (en) |
AU (1) | AU3261495A (en) |
DE (1) | DE69509536T2 (en) |
ES (1) | ES2133794T3 (en) |
FR (1) | FR2724247B1 (en) |
WO (1) | WO1996007166A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU717087B2 (en) * | 1996-05-03 | 2000-03-16 | Garrett Thermal Systems Limited | The detection of airborne pollutants |
AUPN965996A0 (en) * | 1996-05-03 | 1996-05-30 | Vision Products Pty Ltd | The detection of airborne pollutants |
US5926098A (en) * | 1996-10-24 | 1999-07-20 | Pittway Corporation | Aspirated detector |
EP1060766B1 (en) * | 1999-06-10 | 2004-01-21 | Siemens Building Technologies AG | Apparatus for protection from problems arising inside railway tunnels |
GB9915388D0 (en) * | 1999-07-02 | 1999-09-01 | Secr Defence | System for fire-out gas detection |
DE10114729A1 (en) * | 2001-03-22 | 2002-10-02 | Rittal Gmbh & Co Kg | Switchgear cabinet with smoke alarm device, includes fan for drawing air out from interior of switchgear cabinet into housing via inlet aperture in housing wall |
ATE498169T1 (en) | 2003-09-24 | 2011-02-15 | Xtralis Technologies Ltd | METHOD AND DEVICE FOR DETERMINING THE OPERATIONAL STATE OF POLLUTION MONITORING DEVICES |
US7656302B2 (en) | 2006-11-20 | 2010-02-02 | Honeywell International Inc. | Sensing chamber with enhanced ambient atmospheric flow |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4195286A (en) * | 1978-01-06 | 1980-03-25 | American District Telegraph Company | Alarm system having improved false alarm rate and detection reliability |
NL8800634A (en) * | 1988-03-15 | 1989-10-02 | Westinghouse Elektrotechniek E | DEVICE FOR MONITORING THE EXHAUST PIPE (S) OF A SMOKE / GAS DETECTION SYSTEM. |
DE3935238C2 (en) * | 1989-10-23 | 1994-02-24 | Preussag Ag Feuerschutz | Air guidance system, in particular for a fire alarm device |
-
1994
- 1994-09-01 FR FR9410679A patent/FR2724247B1/en not_active Expired - Fee Related
-
1995
- 1995-08-30 ES ES95929148T patent/ES2133794T3/en not_active Expired - Lifetime
- 1995-08-30 DE DE69509536T patent/DE69509536T2/en not_active Revoked
- 1995-08-30 EP EP95929148A patent/EP0777896B1/en not_active Revoked
- 1995-08-30 WO PCT/FR1995/001134 patent/WO1996007166A1/en active IP Right Grant
- 1995-08-30 AU AU32614/95A patent/AU3261495A/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO9607166A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0777896B1 (en) | 1999-05-06 |
FR2724247B1 (en) | 1997-01-24 |
FR2724247A1 (en) | 1996-03-08 |
ES2133794T3 (en) | 1999-09-16 |
WO1996007166A1 (en) | 1996-03-07 |
AU3261495A (en) | 1996-03-22 |
DE69509536D1 (en) | 1999-06-10 |
DE69509536T2 (en) | 1999-12-23 |
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