EP2730316B1 - Optical detector device for fire detection - Google Patents

Description

The invention relates to an optical detector device for fire detection according to the preamble of claim 1.

To detect fires are off DE 28 19 183 C2 and DE 42 00 340 C2 optical detectors are known which respond to radiation emitted during combustion. Described is a fire detection measuring device of the type including a selective fire detection part for detecting at least two different spectral bands as they occur in a fire, and which generates an output signal in response to predetermined amounts of this radiation in the spectral bands, such as a certain size and type of fire to be detected. Systems based on optical triggering factors are commercially successful and demonstrate their utility in various military and civilian fire detection and suppression systems. DE 195 17 517 A1 discloses a passive infrared intrusion detector, in particular mounted on the ceiling of a room to be monitored.

What is required in such optical detectors is that the radiation intensity is a certain threshold must have exceeded for the optical detector to respond. For monitoring a spatial area, for example a vehicle interior, a plurality of detectors with different fields of view are therefore arranged at a distance from one another and connected to a central evaluation unit for receiving and evaluating signals from the detectors.

The survivability of the vehicle occupants and the vehicle itself increase. Early detection of a fire, in order to be able to automatically extinguish it, thus provides protection against fire risks through such fire detection and fire suppression.

The disadvantage is that the prerequisite for the optimal function of the plurality of detectors is that the number and position of the detectors is correctly determined during installation. Only then, no matter where the fire originates, it is detected and can be deleted within a few milliseconds. In addition, interior furnishings can hinder the positioning.

The object of the invention is therefore to provide an optical detection device for fire detection, which improves the fire detection to trigger a deletion process.

This object is solved by the features of claim 1. As a result, an optical detection device for fire detection is created, which is a central unit for ceiling mounting. Such a design is compact and determines their arrangement to each other even before the installation of the detectors, whereby a reliable scanning of a room can be ensured.

The plurality of detectors are assembled as individual detectors on the ceiling mount, wherein each individual detector looks in an at least slightly different direction due to the dome-shaped design of the ceiling mount. The centrally aligned individual detectors set from their individual Fields of view, an optical scanning of the space to be monitored together. The number of individual detectors and the respective position on the ceiling support can be varied. However, the arrangement is preferably rigid when fixed presets are made.

Further embodiments and advantages of the invention will become apparent from the following description and the dependent claims.

• Fig. 1 zeigt schematisch eine perspektivische Ansicht einer optischen Detektoreinrichtung,
• Fig. 2 zeigt eine Kopfansicht der Detektoreinrichtung gemäß Fig. 1,
• Fig. 3 zeigt eine Vorderansicht der Detektoreinrichtung gemäß Fig. 2,
• Fig. 4 zeigt eine Seitenansicht der Detektoreinrichtung gemäß Fig. 2,
• Fig. 5 zeigt eine Ansicht A nach Fig. 2,
• Fig. 6 zeigt schematisch eine perspektivische Ansicht der optischen Detektoreinrichtung gemäß Fig. 1 mit angezeigten Abstrahlwinkelkegeln, die die Blickfelder der Einzeldetektoren bestimmen,
• Fig. 7 zeigt schematisch ein Blockschaltbild einer Auswerteeinheit der Detektoreinrichtung.

The invention will be explained in more detail with reference to the embodiment shown in the accompanying drawings.

• Fig. 1 shows schematically a perspective view of an optical detector device,
• Fig. 2 shows a head view of the detector device according to Fig. 1 .
• Fig. 3 shows a front view of the detector device according to Fig. 2 .
• Fig. 4 shows a side view of the detector device according to Fig. 2 .
• Fig. 5 shows a view A after Fig. 2 .
• Fig. 6 schematically shows a perspective view of the optical detector device according to Fig. 1 with displayed beam angles, which determine the fields of view of the single detectors,
• Fig. 7 schematically shows a block diagram of an evaluation of the detector device.

As Fig. 1 to Fig. 6 show, the invention relates to an optical detection device for fire detection in a room with a plurality of optical detectors, which are arranged distributed as individual detectors 1, 2, 3, 4 on a dome-shaped ceiling mount 5, so that their fields of view 6 (see. Fig. 6 ) look in a different direction. The individual detectors 1, 2, 3, 4 define a number of fields of view 6, in which the space to be monitored is spatially resolved. A complete 360 ° space detection of the ceiling holder 5, which forms a central unit, is possible.

The individual detectors 1, 2, 3, 4 respond to radiation emitted during combustion, each with a pair of sensors 7, 8 whose fields of view 6 are aligned differently for each partial detection of the space to be monitored, such as Fig. 6 shows. The individual detectors 1, 2, 3, 4 are preferably arranged rigidly. Pivoting arrangements are also possible. The respective sensor pair 7, 8 preferably responds to two different wavelengths in the infrared range.

The dome-shaped ceiling holder 5 may be formed semicircular or truncated Vielflächner. The ceiling holder 5 thereby has an outer surface which has curved or differently directed beveled surface sections 9, 10, 11, 12 and distributed to the individual detectors 1, 2, 3, 4 arranged distributed. Are filter discs 13, 14 of the individual detectors 1, 2, 3, 4 aligned to these surface portions 9, 10, 11, 12, for example, aligned flush with these, by the position of the surface portions 9, 10, 11, 12 to the perpendicular 15 and the Beam angle 16 perpendicular to the filter disk 13, 14 of the single detector 1, 2, 3, 4 are set in all directions. The radiation angles 16 limit viewing angle cone as a viewing cone in the range of 35 ° to 55 °, is detected in the radiation for a fire detection. The emission angle 16 is preferably in the range of 45 ° for a 360 ° detection of radiation, as in FIG Fig. 5 and Fig. 6 shown schematically.

In the in the Fig. 1 to Fig. 6 illustrated embodiment of the optical detector device, the ceiling mount 5 is formed, for example, as a tetragonal truncated pyramid, on the pyramidal frustum surfaces, which form the directed surface sections 9, 10, 11, 12, four individual detectors 1, 2, 3, 4 are arranged distributed circumferentially here.

The ceiling holder 5 can be designed for a flush-mounted or suspended ceiling mounting and has fastening elements 17 for this purpose.

The ceiling holder 5 preferably receives a central evaluation unit 18, as shown schematically in FIG Fig. 7 is shown. The individual detectors 1, 2, 3, 4 are connected to an evaluation circuit 19, which evaluates the signals detected and supplied by the individual detectors and is connected to a control device 20 for activating an extinguishing system as a function of detected signals of the individual detectors 1, 2, 3, 4 , The ceiling holder 5 may have connection sockets 21, 22, as in Fig. 2 shown. The control device 20 may be connected in a known manner to display and adjustment elements 23, 24, 25.

In the ceiling holder 5, a ceiling light 26 may also be integrated, which may be switchable via the control device 20.

Claims (11)

1. An optical fire detection device in a room with several optical detectors, which respond to radiation emitted during combustion, each having a pair of sensors, and the fields of view of which are aligned differently for respective partial detection of the room to be monitored and connected to an evaluation unit for receiving and evaluating signals from the detectors, characterized in that the several detectors are designed as individual detectors (1, 2, 3, 4), whereby each individual detector scans in a different direction, whose individual fields of view (6) are determined by the sensor pairs (7, 8) with filter discs (13, 14), each defining two viewing cones with a respective viewing angle cone delimited by a respective radiation angle (16), and the several detectors are distributed on a dome-shaped ceiling mount (5), such that the fields of view (6) each look in a different direction, and the individual detectors (1, 2, 3, 4) define a number of fields of view (6) into which the room to be monitored may be spatially resolved.
2. The optical detector device according to claim 1, characterized in that the individual detectors (1, 2, 3, 4) are arranged rigidly or pivotably.
3. The optical detector device according to claim 1 or 2, characterized in that the dome-shaped ceiling mount (5) is semicircular or designed as a truncated polyhedron.
4. The optical detector device according to any one of claims 1 to 3, characterized in that four individual detectors (1, 2, 3, 4) are provided, which are arranged circumferentially distributed on tetragonal pyramidal frustum surfaces.
5. The optical detector device according to any one of claims 1 to 4, characterized in that the individual detectors (1, 2, 3, 4) detect radiation in the range from 35° to 55° as a viewing cone (6) with a radiation angle (16) formed perpendicularly to a filter disc (13, 14) of the individual detector (1, 2, 3, 4).
6. The optical detector device according to claim 5, characterized in that each radiation angle (16) is in the 45° range for 360° detection of radiation, composed of the detection by several individual detectors (1, 2, 3, 4).
7. The optical detector device according to any one of claims 1 to 6, characterized in that the ceiling mount (5) is designed for flush or suspended ceiling mounting
8. The optical detector device according to any one of claims 1 to 5, characterized in that the ceiling mount (5) houses a central evaluation unit (18).
9. The optical detector device according to any one of claims 1 to 8, characterized in that the evaluation unit (18) has a control device (20) for activating an extinguishing system depending on the detected signals of the individual detectors (1, 2, 3, 4).
10. The optical detector device according to any one of claims 1 to 9, characterized in that the respective sensor pair (7, 8) responds to two different wavelengths in the infrared range.
11. The optical detector device according to any one of claims 1 to 10, characterized in that a ceiling lamp (26) is integrated in the ceiling mounts (5).

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