EP2251846B1 - Détecteur de flammes - Google Patents

Détecteur de flammes Download PDF

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Publication number
EP2251846B1
EP2251846B1 EP09006433.8A EP09006433A EP2251846B1 EP 2251846 B1 EP2251846 B1 EP 2251846B1 EP 09006433 A EP09006433 A EP 09006433A EP 2251846 B1 EP2251846 B1 EP 2251846B1
Authority
EP
European Patent Office
Prior art keywords
radiation
flame detector
optical window
detector according
ring
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.)
Not-in-force
Application number
EP09006433.8A
Other languages
German (de)
English (en)
Other versions
EP2251846A1 (fr
Inventor
Hauke Dipl.-Ing. Dittmer
Axel Dipl.Ing. Grothoff
Dirk Dipl.-Ing. Siemer
Arne Dipl.-Ing. Stamer
Peter Dipl.-Ing. Zülzer
Kurt Dipl.-Phys. Dr. Lenkeit
Bernd Dipl.-Ing. Ziems
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Minimax GmbH and Co KG
Original Assignee
Minimax GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Minimax GmbH and Co KG filed Critical Minimax GmbH and Co KG
Priority to EP09006433.8A priority Critical patent/EP2251846B1/fr
Priority to RU2010119163/08A priority patent/RU2538940C2/ru
Priority to US12/800,298 priority patent/US8400314B2/en
Priority to CN201010228100.1A priority patent/CN101894442B/zh
Publication of EP2251846A1 publication Critical patent/EP2251846A1/fr
Application granted granted Critical
Publication of EP2251846B1 publication Critical patent/EP2251846B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions
    • 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
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G08B29/043—Monitoring of the detection circuits of fire detection circuits

Definitions

  • the invention relates to a flame detector according to the preamble of the first claim.
  • the invention can be used anywhere where flame detectors are used to detect a fire and IR or UV radiation occurs, which is measured after passing through an optical window, whereby contamination of the optical window and the function is monitored and a protection against mechanical Damage to the window allows trouble-free detection of fire phenomena.
  • Flame detectors for detecting optical fire phenomena have long been known. They usually consist of a housing in which sensor elements and a corresponding signal processing electronics are arranged, wherein an optical window closes the housing in the direction of the fire phenomenon to be detected. Through the optical window, radiation falls into the housing and is detected by means of a sensor.
  • the problem is that the optical window can pollute, whereby less radiation enters the housing and errors in the detection can occur. Furthermore, the result of the detection can be falsified by influences such as sun rays, shadows and the like.
  • the optical window is exposed to mechanical influences that can lead to destruction or at least damage. In industrial areas or dust explosion hazardous areas there are high demands on the tightness and the mechanical strength of the housing and the optical entrance window.
  • a detector for detecting electromagnetic radiation with a cover plate which is transparent to the radiation and has a housing which is impermeable to the radiation which responds to electromagnetic radiation and generates an electrical output signal as a function of the radiation.
  • the contamination of the cover is measured by the electromagnetic radiation of a radiation source on the cover, so the optical window, passed and measured by the sensor element in the interior of the detector as a measure of pollution.
  • US 5,257,013 describes a flame detector on the underside of which a protection against mechanical stresses in the form of brackets or deflectors is arranged.
  • the detector does not have a large-area optical window and the mechanical protection does not serve to monitor the contamination of the entrance window or the function monitoring of the sensors.
  • a disadvantage of the existing flame detectors is that they must be set or rebuilt according to the expected flame event.
  • US 4,547,673 describes a flame or smoke detector with a radiation receiver element and a maximum of two radiation sources. This has specially arranged reflectors.
  • the reflective elements are optimized to affect a minimum of the surface of the entrance window.
  • the disadvantage is that due to the geometric conditions (large optical window and areal small reflectors) and lack of explanations on the mechanical strength of the reflector material, these reflectors do not provide sufficient mechanical protection.
  • the detection of fires by means of flame detectors can then lead to false alarms if sunlight, artificial light, welding, heaters or other sources of interference distort the result.
  • US 3952 196 A describes a UV flame detector with UV receiver element and UV transmitter, which has a bridge with reflective elements above the optical window.
  • the bridge and the reflective elements are intended only for the contamination monitoring of the optical window. Due to the geometric conditions (large optical window and areal small web) this reflector does not provide sufficient mechanical protection. There is also no functional monitoring of the sensors and the signal processing electronics provided. Furthermore, the reflector is not easily replaceable. Since the holder of the reflector simultaneously holds the optical window, the replacement of the reflector is expensive. Without this part of the detector is not functional, since the optical window has no support in the present construction.
  • the solution according to the invention provides a flame detector, consisting of the housing, in which sensors, one or more radiation sources and an optical window are arranged, in which a reflector guard basket or ring is arranged above the optical window, which is suitable for the optical window to protect against mechanical influences, transmits IR and UV radiation to a sufficient extent and on its inside is suitable to reflect UV and IR radiation.
  • the most favorable embodiment variant of the reflector protective basket is an exchangeable metal grid, which has a mirrored surface and which is elastic.
  • the reflector protective cage or ring made of elastic durable plastic, which is chromed or mirrored on its surface.
  • the elastic reflector guard basket may have interconnected webs, which open at their ends in a receiving flange to the optical window and engage in a recess or a groove in the receiving flange and thus are stably fixed.
  • wide and narrow tabs can be made, which are introduced into different width recesses in the receiving flange and anchored in this.
  • the reflector protection basket can cover the entire surface of the window as a concave hood, which by a Easily squeezable by hand, usable or screwed in as a bayonet lock, removable and replaceable.
  • the reflector guard basket or ring can also cover only a certain area at the edge of the optical window. Under certain circumstances, however, it is also sufficient to guide only one or more protective strips over the optical window in a protective manner.
  • the removal of the reflector protection basket has no influence on the tightness of the housing and the functionality of the flame detector. It can be removed or replaced at any time. Furthermore, most of the surface of the optical window is protected from mechanical destruction by the reflector guard basket or ring.
  • optical window it is advantageous to carry out the optical window as CaF 2 , sapphire or other UV / IR permeable materials such as mica or the like.
  • the housing consists of an upper and a lower part, wherein the supply lines for the energy and for the signals, for example, to an alarm station and in the upper part of the sensors and all signal processing components are arranged in the lower part.
  • the reflector guard In the upper housing part of the optical window, the reflector guard, sensors, the radiation source and possibly a microcontroller are arranged and an electrical plug connection to the lower part.
  • IR and / or UV radiation sensors can also be only or additionally imaging sensors.
  • a UV radiation sensor may be arranged, which detects a flame signal and the signal of the radiation source. It is also conceivable, however, one or more IR sensors or a combination of IR and UV sensors.
  • an IR radiation sensor can be arranged on the level immediately below the optical window and a UV radiation sensor one level lower.
  • an optical signal is sent through the optical window by the radiation source or the radiation sources in the upper part, which is reflected on the reflector guard and reflected to the IR and / or UV radiation sensor, so that after double penetration of the beam through
  • the optical window can be a measure of what pollution the optical window and the function of the sensors and the signal processing electronics can be tested.
  • one or more IR and / or several UV radiation sources may be arranged.
  • the housing upper part which is exchangeable, can be placed on the housing lower part.
  • sealing rubbers should be arranged between the housing parts.
  • Other types of seals may be advantageous.
  • This seal or an additional may be formed as an electrically conductive EMC gasket. Due to the interchangeability of the housing upper part, it is possible to respond quickly to current requirements, if required, according to the modular principle.
  • Another possible communication module could have integrated the industry-standard 4.4 .... 20mA interface for alarm transmission.
  • Digital communication modules make it possible with the fire alarm panel via Looptechnik, d. H. To communicate data exchange with the fire alarm panel via a protocol and thus to locate the alarm, retrieve the status of the flame detector at the fire panel or to parameterize the detector from the fire panel.
  • the service interface can be designed as a connector or socket.
  • the invention has the advantage that the optical window is protected even with the appropriate size from mechanical influences, with a pollution monitoring of Window, a function monitoring of the sensors and the signal processing electronics and easy replacement of components in the flame detector is given.
  • FIG. 1 shows a schematic representation of the flame detector according to the invention, consisting of the upper housing part 1.1 and the lower housing part 1.2, between which are seals, housing upper part and lower housing part 1.1, 1.2, are connected to each other by an electrical connector 14, in the signal lines and power supplies are arranged.
  • the housing upper part 1.1 there is an electronic module 18 on a plane consisting of the UV radiation sensor 8.1 with the UV filter 10.1 of the UV radiation source 9.1, the addressing switch 17 and the communication module 16 with its connector 15.
  • the optical window 7 is made of sapphire and is held by the receiving flange 4, in which the reflector guard basket 2.1 is arranged.
  • a flame phenomenon which emits UV radiation can be detected by the radiation sensor 8. 1 in an intended wave range.
  • a light signal corresponding to the wavelength emitted by the radiation source 9.1, which is reflected by the reflector guard basket 2.1 and by the UV radiation sensor 8.1 is detected.
  • the reflector protection cage 2.1 protects the optical window 7 against mechanical damage and reflects the radiation emitted by the UV radiation source 9.1 to the UV radiation sensor 8.1.
  • the reflected radiation is used for contamination analysis of the optical window 7 and for monitoring the function of the sensors and the subsequent signal processing.
  • About the replaceable communication module 16 of the flame detector communicates with the fire panel.
  • the addressing switch 17 serves, in the case of using a digital communication module, which makes the detector to a subscriber in a signaling ring, with the set address an alarm or fault signal to assign this detector clearly.
  • a connector is arranged as a service interface 20, which also in the Figures 2 and 3 you can see.
  • FIG. 2 shows an embodiment of the flame detector according to the invention, consisting of housing upper part 1.1 and lower housing part 1.2, in which two electronic modules 18, 19 are arranged, the lower electronic module containing the addressing switch 17 and the communication module 16 with connector 15 and the upper assembly 19 each have three IR radiation sensors 8.2 with IR filter 10.2 and IR radiation sources 9.2, which emit an IR beam on the reflector protection ring 2.2, which reflects this over the IR filter 10.2 to the IR radiation sensor 8.2. Between the modules 18, 19, a connector 13 is arranged.
  • FIG. 3 shows a similar arrangement of the electronic components in a schematic representation, which is located above the optical window 7 a reflector guard basket 2.1 and in the lower electronic module 18 additionally a UV radiation source 9.1 and a UV radiation sensor are 8.1 with UV filter 10.1. With this version of the flame detector both UV and IR radiation can be detected.
  • FIG. 4 shows the hood-shaped designed reflector guard basket 2.1, through whose free spaces the UV and / or IR radiation can enter unhindered, with different width tabs 3.2, 3.1 are present, with which the elastic reflective reflector guard 2.1 in the receiving flange 4 can be screwed.
  • the reflector guard 2.1 is made of reflective metal sheet, the tabs 3.2, 3.1 by hand in the bayonet mount or recess 5.1 and 5.2 of the flange Fig. 6 be arrested.
  • reflector protection ring 2.2 which has a very large transmissive surface for the UV and IR radiation.
  • Both reflector protection basket 2.1 and the reflector protection ring 2.2 can be used with their tabs 3.1, 3.2 in the recesses 5.1, 5.2 of the receiving flange 4 and can be rotated in this.
  • the stop notch 6 serves to limit this twisting movement.
  • the receiving flange 4 holds both the optical window 7 and the reflection guard or the reflection protection ring 2.1, 2.2.
  • FIG. 7 shows the schematic representation of the radiation sensors 8.1, 8.2 for trouble-free detection of flames, with three IR radiation sensors 8.2 are arranged side by side with IR filter 10.2, the signal of a signal processing 11 is supplied.
  • This signal processing 11 represents an A / D converter, an amplifier or a signal adaptation, which leads to a microcontroller 12 with memory which processes and stores the signal.
  • an IR radiation source 9.2 is arranged, which emits an IR radiation for checking the degree of soiling of the optical window 7.
  • a UV radiation sensor can be arranged 8.1 with UV filter 10.1, the signal from the sensor is forwarded via a signal adjustment to the microcontroller with memory 12 and from a UV radiation source 9.1 UV signals to the optical window 7 for checking the Pollution degree and the function of the sensors can be sent.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Claims (10)

  1. Détecteur de flammes, constitué d'un boîtier, dans lequel sont disposés au moins un capteur (8.1, 8.2), au moins une source de rayonnement (9.1, 9.2) et une fenêtre (7) optique,
    dans lequel est disposé, au-dessus de la fenêtre (7) optique, un panier ou un anneau de protection de réflecteur (2.1, 2.2), qui est adapté pour protéger la fenêtre (7) optique contre des effets mécaniques, qui laisse passer en une quantité suffisante un rayonnement UV et un rayonnement IR (16) et qui réfléchit, au niveau de sa face intérieure, le rayonnement UV et le rayonnement IR (16) provenant de l'intérieur du boîtier,
    dans lequel le panier (2.1) ou l'anneau (2.2) de protection de réflecteur est réalisé de manière élastique et fait saillie, par ses extrémités, dans une bride de logement (4) d'une partie supérieure de boîtier (1.1) du boîtier,
    caractérisé en ce que la bride de logement (4) présente un logement à baïonnette ou un évidement (5.1, 5.2) pourvu d'une encoche de butée (6), dans lequel le panier (2.1) ou l'anneau (2.2) de protection de réflecteur peut être introduit par rotation dans la bride de logement (4) en tant que fermeture à baïonnette, peut être retiré et remplacé, dans lequel un mouvement de torsion du panier (2.1) ou de l'anneau (2.2) de protection de réflecteur est délimité par l'encoche de butée (6), dans lequel le panier (2.1) ou de l'anneau (2.2) de protection de réflecteur présente en tant que protection anti-torsion des languettes (3.1, 3.2) de largeur différente, qui peuvent être insérées dans l'évidement (5.1, 5.2) de la bride de logement (4) et peuvent être verrouillées dans cette dernière.
  2. Détecteur de flammes selon la revendication 1,
    caractérisé en ce que le boîtier est constitué d'une partie supérieure (1.1) et d'une partie inférieure (1.2), dans lequel la fenêtre (7) optique, le panier ou l'anneau de protection de réflecteur (2.1, 2.2), le capteur de rayonnement (8.1, 8.2) et la source de rayonnement (9.1, 9.2) sont disposés dans la partie supérieure (1.1) et un passage de câble et un raccord pour les conduits d'arrivée et une connexion électrique à fiches (14) avec la partie supérieure (1.1) sont disposés dans la partie inférieure (1.2).
  3. Détecteur de flammes selon la revendication 2,
    caractérisé en ce que les capteurs de rayonnement dans la partie supérieure (1.1) constituent des capteurs de rayonnement UV (8.1) et/ou des capteurs de rayonnement IR (8.2).
  4. Détecteur de flammes selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que les capteurs de rayonnement (8.1, 8.2) sont disposés sur des niveaux différents pour des modules (18, 19) électroniques.
  5. Détecteur de flammes selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que la source de rayonnement constitue une source de rayonnement UV et/ou au moins une ou plusieurs sources de rayonnement IR (9.1, 9.2).
  6. Détecteur de flammes selon l'une quelconque des revendications 1 à 5,
    caractérisé en ce qu'un dispositif à fiches (15) pourvu d'un module de communication (16) pouvant être remplacé est disposé dans la partie supérieure de boîtier (1.1).
  7. Détecteur à flammes selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que la fenêtre (7) optique est constituée de CaF2, de saphir ou d'un autre matériau laissant passer les UV/IR.
  8. Détecteur à flammes selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce qu'un commutateur d'adressage (17) est disposé dans la partie supérieure de boîtier (1.1).
  9. Détecteur à flammes selon l'une quelconque des revendications 1 à 8,
    caractérisé en ce que le panier ou l'anneau de protection (2.1, 2.2) est constitué d'une tôle de métal ou d'une matière plastique.
  10. Détecteur de flammes selon l'une quelconque des revendications 1 à 9,
    caractérisé en ce qu'une interface de service (20) est prévue pour la mise en contact d'un appareil de service aux fins de la configuration, du paramétrage et aux fins des mises à jour de logiciels, ainsi qu'afin de transmettre l'historique à un calculateur ou à une base de données.
EP09006433.8A 2009-05-13 2009-05-13 Détecteur de flammes Not-in-force EP2251846B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP09006433.8A EP2251846B1 (fr) 2009-05-13 2009-05-13 Détecteur de flammes
RU2010119163/08A RU2538940C2 (ru) 2009-05-13 2010-05-12 Пожарный извещатель
US12/800,298 US8400314B2 (en) 2009-05-13 2010-05-12 Fire alarm
CN201010228100.1A CN101894442B (zh) 2009-05-13 2010-05-13 火焰报警器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09006433.8A EP2251846B1 (fr) 2009-05-13 2009-05-13 Détecteur de flammes

Publications (2)

Publication Number Publication Date
EP2251846A1 EP2251846A1 (fr) 2010-11-17
EP2251846B1 true EP2251846B1 (fr) 2017-04-05

Family

ID=41071454

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09006433.8A Not-in-force EP2251846B1 (fr) 2009-05-13 2009-05-13 Détecteur de flammes

Country Status (4)

Country Link
US (1) US8400314B2 (fr)
EP (1) EP2251846B1 (fr)
CN (1) CN101894442B (fr)
RU (1) RU2538940C2 (fr)

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US8400314B2 (en) 2013-03-19
US20100289650A1 (en) 2010-11-18
CN101894442B (zh) 2014-07-23
CN101894442A (zh) 2010-11-24
RU2538940C2 (ru) 2015-01-10
EP2251846A1 (fr) 2010-11-17
RU2010119163A (ru) 2011-11-20

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