EP0559065B1 - Branderkennungsvorrichtung - Google Patents

Branderkennungsvorrichtung Download PDF

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Publication number
EP0559065B1
EP0559065B1 EP93102856A EP93102856A EP0559065B1 EP 0559065 B1 EP0559065 B1 EP 0559065B1 EP 93102856 A EP93102856 A EP 93102856A EP 93102856 A EP93102856 A EP 93102856A EP 0559065 B1 EP0559065 B1 EP 0559065B1
Authority
EP
European Patent Office
Prior art keywords
air
funnel
exhaust air
measuring chamber
devices
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.)
Expired - Lifetime
Application number
EP93102856A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0559065A1 (de
Inventor
Ernst Werner Wagner
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.)
Wagner Alarm- und Sicherungssysteme GmbH
Original Assignee
Wagner Alarm- und Sicherungssysteme GmbH
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Filing date
Publication date
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Application filed by Wagner Alarm- und Sicherungssysteme GmbH filed Critical Wagner Alarm- und Sicherungssysteme GmbH
Publication of EP0559065A1 publication Critical patent/EP0559065A1/de
Application granted granted 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
    • G08B17/10—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 invention relates to a device for detecting fires in forced-ventilated devices or machines, for example in EDP devices and similar electronic devices, with an exhaust air funnel that takes a representative portion of the main cooling air flow at the air outlet of the device to be monitored and via an air line of a measuring chamber supplies, and with at least one detector for detecting a fire parameter, which is arranged in the measuring chamber in the air flow and is connected, for example, via an electronic circuit to a warning, extinguishing and / or shutdown device.
  • Such a device is e.g. in DE-A-34 33 459.
  • Such devices are also known, for example, under the technical term "facility protection systems".
  • Typical areas of application for equipment protection systems are EDP systems and in particular individual components thereof as well as similar electronic devices such as measuring, control and regulating systems, switching devices and private branch exchanges, modem cabinets, CNC-controlled work machines and industrial robots, CAD / CAM systems or printers.
  • the electronic assemblies of such devices or machines have to be cooled due to their heat development, for example by ventilation, and depending on the type of ventilation generated, either ventilated devices are spoken of, in which the cooling air flow is generated by a fan in the device, or of naturally ventilated devices, in which, due to the special arrangement of the devices at the installation site, natural or artificial convection of the air in the room is used.
  • fire parameter is understood to mean physical parameters that can be measured in the vicinity of an incipient fire Changes are subject to changes, e.g. the ambient temperature, the solids or liquid or gas content in the ambient air (formation of smoke particles or aerosols - or steam) or the ambient radiation.
  • plastics such as PVC and polyethylene, for example as cable insulation, come into consideration as flammable materials, when they are burned, hydrogen chloride gases are released which, in conjunction with water removed from the air, react to form hydrochloric acid. This sits as a fine mist on the devices or machines in the room and penetrates them through the room air. The result is corrosion processes, the renovation of which often results in the failure of a complete system.
  • the fire detection devices mentioned at the outset were developed which, using one (or more) exhaust air funnels, continuously tap cooling air samples from the skin cooling air stream directly at the air outlet of the device to be monitored and feed them to a measuring chamber via a relatively short air line, which, for example, on the one to be protected Device can be set up.
  • the tapping of the representative part of the main cooling air flow takes place mainly by a separate fan, which feeds the tapped air quantity through the air line to the detectors located in the measuring chamber.
  • the present invention addresses this problem, and its task was to shorten the detection time as well as to increase the reliability of the known fire detection devices.
  • This object is achieved in a known device for detecting fires in forced-ventilated devices, for example in EDP devices and similar electronic devices which have an exhaust air funnel which takes a representative portion of the main cooling air flow at the air outlet of the device to be monitored and via an air line of a measuring chamber supplies and has at least one detector for detecting a fire parameter, which is arranged in the measuring chamber in the air flow and is connected for example via an electronic circuit to a warning, extinguishing and / or shutdown device, according to the invention solved in that the wall of the exhaust funnel over its circumference has distributed breakthroughs.
  • This fire detection device is based on the consideration of reducing in a controlled manner the cooling air build-up arising under the exhaust air funnels of the known devices and the associated turbulence, in that part of the tapped cooling air is discharged through the openings in the exhaust air funnel wall.
  • the exhaust air funnel according to the invention thus ensures by means of its breakthroughs that the cooling air impinging on the inner wall of the exhaust air funnel is not additionally whirled up or thrown back entirely, but that it is supplied to the air line in a largely laminar flow of cooling air without backflow. The result is an extremely reliable and fast-acting fire detection device.
  • the fan which is generally arranged in the measuring chamber, does not have to be dimensioned excessively large for sucking in the tapped amount of cooling air, which has the further disadvantages of higher energy consumption and greater noise development and would bring with it a larger dimensioned measuring chamber.
  • the fan located in the measuring chamber then essentially only has the function of sucking the quantity of cooling air in the air line into the measuring chamber against the frictional losses inside the air line.
  • the clear cross section of the openings in the wall of the exhaust air funnel can be changed.
  • the exhaust air funnel is essentially frustoconical and the openings are provided in the frustum of the cone.
  • the exhaust air funnel is essentially truncated pyramid-shaped and the openings are provided in the truncated pyramid.
  • these two preferred designs of the exhaust air funnel can be supplemented by a large number of further alternatives. Since the shape of the exhaust air funnel optimizes the flow conditions within the exhaust air funnel, but also in the area between the air outlet of the device to be monitored and the exhaust air funnel, stand in the foreground, the selection of several aerodynamic shapes can essentially depend on the geometric arrangement of the air outlet. In this respect, for example, a truncated pyramid-shaped exhaust funnel is more likely to be used in the case of fairly narrow air outlets, while the shape of the truncated cone will be preferred in the case of large-area air outlets.
  • the clear cross section of the openings in the truncated cone jacket can be adjusted by means of a ring which is mounted centrally on the exhaust air funnel.
  • the ring can have, for example, star-shaped cover sections in the cross section, which cover the openings completely or partially when the ring is set accordingly.
  • that ring with the cover sections can also be stationary, while the exhaust air funnel itself can be rotatable relative to that ring in order to change the clear cross section of the openings.
  • the essence of this development is the rotatability of the openings against the cover sections or vice versa, in order to change the clear cross section of the openings.
  • a further development of the fire detection device according to the invention relates both to the optimal tapping of the partial quantity from the main cooling air flow and to flexible handling of the entire fire detection device at the place of use.
  • the air line between the measuring chamber and the exhaust air funnel consists of a flexible hose and attaches to the top surface of the truncated cone or truncated pyramid.
  • the exhaust air funnel is attached directly to the air outlet of the device to be monitored, the main cooling air flow is partially returned to the device to be monitored, it is preferably provided that the exhaust air funnel is attached at a distance from the air outlet of the device to be monitored by means of spacers.
  • the exhaust air funnel 1 shows an exhaust air funnel 1 as it is used in a device for detecting fires in forced-ventilation devices or machines, for example in EDP devices and similar electronic devices.
  • the exhaust air funnel 1 is attached to the air outlet (not shown here) of a device to be monitored at a distance from the air outlet, so that a representative subset is removed from the main cooling air flow of the device to be monitored by means of the air outlet funnel.
  • This amount of air - also air sample - is fed via a flexible hose 6 to a measuring chamber (also not shown here), which is equipped in a manner known per se with at least one detector for detecting a fire parameter.
  • the detector can either be a smoke detector, a gas detector or else a heat detector, with smoke detectors preferably being used.
  • the exhaust air funnel 1 is essentially frustoconical and has a number of openings 3 in its wall 2, ie in the truncated cone, distributed over its circumference.
  • the clear cross section of those openings 3 is by twisting one Ring 4 changeable, whereby the lid portions 10 attached to the ring 4 slide over the openings 3 and cover them, or release the openings 3.
  • the ring 4 is rotated by an adjusting ring 9.
  • the mechanics of rotating the cover sections 10 against one another against the openings 3 can, of course, also be achieved in that the ring 4 with the cover sections 10 is designed to be stationary, while the jacket region of the exhaust air funnel carrying the openings 3 1 can be rotated by means of the adjusting ring 9.
  • the state shown in FIG. 1 shows a slight opening of the openings 3, so that a certain proportion of the amount of cooling air entering the exhaust air funnel 1 in the direction of arrow 13 is discharged to avoid an air backflow.
  • FIG. 2 shows a top view of the exhaust air funnel according to FIG. 1, the ring 4 with the cover sections 10 being shown in the form of a section through the truncated cone jacket.
  • a scale 8 is provided, the division of which in cooperation with an indicator tongue 11 can give an indication of the setting at different flow rates of the main cooling air flow of the device to be monitored. A division of the scale 8 into m / sec is recommended for this.
  • Fig. 3 shows a second embodiment of an exhaust funnel 1, which is substantially truncated pyramid-shaped.
  • the flexible hose 6 attaches to the top surface 7 of the truncated pyramid.
  • the basic shape of the pyramid chosen here is a rectangle, and an opening 3 is provided in each of the two narrower lateral surfaces of the truncated pyramid, the clear cross section of which can be changed by means of a flap 12.
  • Fig. 4 shows a third embodiment of an exhaust funnel 1 with the same shape as in the previous embodiment. Here, however, are narrower in the two
  • the lateral surfaces of the truncated pyramid provide several smaller openings 3, the density of which increases in the direction of the top surface 7.
  • the openings 3 in this exemplary embodiment of an exhaust funnel 1 are not variable in their clear cross section.
  • FIG. 5 shows the first exemplary embodiment of the exhaust air funnel 1 at the air outlet 15 of an equipment cabinet 14.
  • the representative part air volume tapped by the exhaust air funnel 1 from the main cooling air flow of the equipment cabinet 14 to be monitored is fed via the flexible hose 6 to the measuring chamber 5 of the fire detection device.
  • the detectors not shown
  • a reaction in the form of an alarm or the like is triggered by the electronic circuit connected to the detectors.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire Alarms (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Circuits Of Receivers In General (AREA)
  • Chimneys And Flues (AREA)
EP93102856A 1992-03-03 1993-02-24 Branderkennungsvorrichtung Expired - Lifetime EP0559065B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4206656A DE4206656C1 (da) 1992-03-03 1992-03-03
DE4206656 1992-03-03

Publications (2)

Publication Number Publication Date
EP0559065A1 EP0559065A1 (de) 1993-09-08
EP0559065B1 true EP0559065B1 (de) 1997-05-21

Family

ID=6453112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93102856A Expired - Lifetime EP0559065B1 (de) 1992-03-03 1993-02-24 Branderkennungsvorrichtung

Country Status (8)

Country Link
EP (1) EP0559065B1 (da)
AT (1) ATE153464T1 (da)
DE (2) DE4206656C1 (da)
DK (1) DK0559065T3 (da)
ES (1) ES2103389T3 (da)
FI (1) FI111882B (da)
GR (1) GR3024356T3 (da)
NO (1) NO305418B1 (da)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10344188B3 (de) * 2003-09-22 2005-05-25 Minimax Gmbh & Co. Kg Vorrichtung zur Brand-, Rauch- und Funktionsüberwachung von Rotorblättern in Windenergieanlagen und Windenergieanlage

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH491449A (de) * 1969-05-19 1970-05-31 Cerberus Ag Rauchdetektoranordnung mit mindestens einer Rauchmesskammer
US4208655A (en) * 1978-02-21 1980-06-17 Westinghouse Electric Corp. Protective system for electrical apparatus
CH648943A5 (de) * 1980-05-09 1985-04-15 Cerberus Ag Rauchmelder.
US4319229A (en) * 1980-06-09 1982-03-09 Firecom, Inc. Alarm system having plural diverse detection means
DE3433459A1 (de) * 1984-09-12 1986-03-20 Wagner Alarm- und Sicherungssysteme GmbH, 3108 Winsen Einrichtung/detektionsgeraet zur frueherkennung von brand und ueberhitzung, an/aufgebaut auf gehaeusen/schraenken, die eingebaute elektrische/elektronische und sonstige anlagen umschliessen
US4718021A (en) * 1985-09-20 1988-01-05 Timblin Stanley W Technique for fan cycling to maintain temperature within prescribed limits

Also Published As

Publication number Publication date
FI930951A (fi) 1993-09-04
FI111882B (fi) 2003-09-30
DK0559065T3 (da) 1997-06-30
FI930951A0 (fi) 1993-03-03
DE59306483D1 (de) 1997-06-26
EP0559065A1 (de) 1993-09-08
ES2103389T3 (es) 1997-09-16
NO930765L (no) 1993-09-06
NO305418B1 (no) 1999-05-25
ATE153464T1 (de) 1997-06-15
DE4206656C1 (da) 1993-05-19
NO930765D0 (no) 1993-03-02
GR3024356T3 (en) 1997-11-28

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