EP1376505A1 - Fire detector - Google Patents

Abstract

The device has an alarm insert with a sensor arrangement (2) and evaluation electronics and a housing (3) around the sensor arrangement with openings for the entry of air and smoke if appropriate to the sensor arrangement. The device is modular and is designed to accept detection modules with sensors for different fire parameters, whereby all detection modules are compatible with a single housing.

Description

The present invention relates to a fire detector with a detector insert, which a Sensor arrangement and has an evaluation, and with a sensor arrangement surrounding housing with openings for access of room air and possibly smoke to the sensor arrangement.

The sensor arrangement may, for example, an electro-optical sensor for detecting the caused by smoke in the room air generated stray light, or a temperature sensor for detecting the heat generated in a fire or a gas sensor for the detection of Have combustion gases or combinations of these sensors. In the previously known fire detectors is depending on the sensor arrangement used both the detector insert and the Housing different, so that requires a separate injection molding tool for each detector type becomes what increases the manufacturing cost. Also the storage of different types of detector inserts and housings causes undesirable costs.

The invention will now be a standardization of the detector inserts and the housing and so that a reduction of the costs are made possible. The goal is that for different Detector types a single housing can be used.

This object is achieved according to the invention that the detector modular and is designed for receiving detection modules for different fire parameters, wherein all detection modules are compatible with a single housing.

Due to the modular structure with a housing and various compatible with this Detection modules results in a universally applicable detector with a uniform external appearance. This looks aesthetically pleasing and also causes a noticeable reduction in production costs.

Today, so-called optical-thermal detectors are widely used, which is an electro-optical Have sensor and a temperature sensor. These detectors are in most cases the temperature sensor arranged in the level below the electro-optical sensor, namely preferably in the center axis of the detector. Mostly also the mentioned access openings are located at this lower level. This results in a detector height determining "multi-level" structure of the detector. For aesthetic reasons, however, many times desired the lowest possible height of the detector.

Another object of the invention is to provide a fire detector with one of the various Detection modules compatible housing of the lowest possible height specify.

This object is achieved according to the invention in that the sensor arrangement and the mentioned Access openings are arranged substantially on one level.

The detector according to the invention is therefore a relatively flat detector, both as Mehrkriterienals can also be used as Einkriterienmelder. The low height of the detector will by the arrangement of the sensor arrangement and the access openings on a level allows.

A first preferred embodiment of the inventive fire alarm is characterized characterized in that the detection modules one for all types of detectors and the same in the detector usable carrier plate, which for receiving the sensors for the various Fire characteristics is formed.

A second preferred embodiment is characterized in that the carrier plate on their underside facing the detector base housing for receiving components of a having electro-optical sensor system and at its top for holding a transmitter supporting circuit board is formed.

A third preferred embodiment of the fire detector according to the invention is characterized in that that the housing has a detector hood, which consists of an annular upper and one of this spaced and forming the tip of the detector lower Part exists. The space between the two parts of the detector hood forms the mentioned Access openings and said lower part is connected to the upper part by curved or rib-like webs connected.

A fourth preferred embodiment is characterized in that an optical detection module is intended for the measurement of scattered light caused by smoke, which at least one light source, a light receiver, a measuring chamber and a labyrinth system having arranged on the periphery of the measuring chamber aperture, wherein the at least a light source and the light receiver in the housings on the underside of the carrier plate are fixed and the labyrinth system formed lid-like and fixable on the support plate is.

A further preferred embodiment is characterized in that a thermal Detection module is provided with two temperature sensors, which radially opposite each other lying on the circuit board are fixed and from this through the support plate down protrude. A development of this embodiment is characterized in that said Webs in the form of wings or tabs with a vertically extending recess are formed and provided in an even number, and that the temperature sensors so from the top each against one of the webs protrude that their free ends directly in or behind the recess lie. The thermal detection module has a fixable on the support plate Cover plate for the cover provided for the electro-optical sensor system Housing on, and on the cover plate are openings for the passage of the temperature sensors and a separating wall extending between the temperature sensors in the radial direction intended to achieve a directed air flow.

A further preferred embodiment of the fire detector according to the invention is characterized in that an optical-thermal detection module for the measurement of Smoke caused scattered light and temperature measurement is provided, which is an electro-optical Sensor system and two temperature sensors, the latter laterally are arranged next to the optical sensor system.

According to a development of this preferred embodiment, the temperature sensors mounted radially opposite each other on the circuit board and lie with their free Ends in the area of one of the said webs. Preferably, the webs are formed so that on the one hand they protect the temperature sensors from mechanical influences and On the other hand, ensure the most undisturbed air flow of the temperature sensors.

Fig. 1

eine perspektivische Darstellung eines ersten Ausführungsbeispiels eines erfindungsgemässen Melders von vorne unten gesehen,

Fig. 2

eine perspektivische Darstellung eines Querschnitts durch den Melder von Fig. 1,

Fig. 3

eine perspektivische Darstellung eines Axialschnitts durch den Melder von Fig. 1,

Fig. 4

eine Draufsicht auf den Melder von Fig. 1,

Fig. 5

eine perspektivische Darstellung einer Draufsicht auf den Melder von Fig. 1 ohne Sockel aber mit Sockelklemme,

Fig. 6

eine perspektivische Darstellung eines zweiten Ausführungsbeispiels eines erfindungsgemässen Melders von vorne unten gesehen,

Fig. 7

eine perspektivische Ansicht des Melder von Fig. 6 bei abgenommener Melderkuppe von unten gesehen; und

Fig. 8

eine perspektivische Darstellung eines Axialschnitts durch den Melder von Fig. 6.

In the following the invention will be explained in more detail with reference to embodiments and the drawings; it shows:

Fig. 1

a perspective view of a first embodiment of an inventive detector seen from the front bottom,

Fig. 2

3 a perspective view of a cross section through the detector of FIG. 1,

Fig. 3

3 a perspective view of an axial section through the detector of FIG. 1,

Fig. 4

a top view of the detector of Fig. 1,

Fig. 5

1 is a perspective view of a plan view of the detector of Figure 1 without socket but with base terminal.

Fig. 6

a perspective view of a second embodiment of an inventive detector seen from the front bottom,

Fig. 7

a perspective view of the detector of Figure 6 with the detector tip removed from below. and

Fig. 8

a perspective view of an axial section through the detector of Fig. 6.

The smoke detector shown in Figures 1 to 5 consists in a known manner of three Main components, a socket 1, an optical sensor system 2 and a housing. 3 This structure is best seen in Fig. 3. Fig. 2 shows in a cross section through the Detector looking from below a view of part of the optical sensor system. 2

The base 1 is intended for mounting on the ceiling of the space to be monitored, wherein Mounting either directly on a flush-mounted box or surface-mounted with or without additional pedestal he follows. The base 1, which consists essentially of a circular plate and a down protruding edge web, contains, inter alia, a connector strip 4 (Fig. 3, 4), which for Receiving a connected to the sensor system contact strip 5 (Fig. 4) is provided.

The optical sensor system 2 includes a plate-shaped support 6 for the optical sensor, a fixed to the underside of the carrier 6 lid-shaped labyrinth 7, one at the base 1 facing upper side of the carrier 6 arranged circuit board 8 with the transmitter and the circuit board 8 at the edge and upwardly covering cover 9, which Part of the housing 3 forms. The contact strip 5 is an integral part of the support plate 6 and sticks out of it. The cover 9 has substantially the shape of a plate with a peripheral collar at the edge and with an opening 10 for the passage of Contact strip 5, so that this protrudes into the plane of the socket 1 arranged in the socket 1.

The apparent from Fig. 2 optical sensor includes a through the support 6 and the labyrinth. 7 formed measuring chamber with a light catcher 11 and two light sources 12, 12 ', respectively in a housing 13, 14, 15 are arranged. These housings consist of a bottom part, in which the respective diode (photodiode or IRED) is held, and at its the center the measuring chamber facing front a window opening for the light inlet or light exit having. As the figure can be seen, is in the measuring chamber in the area in front of the said window-like openings of the housing 13, 14, 15 formed scattering space compact and exposed trained. This arrangement and design makes the detector for use a transparent body for smoke simulation which can be used in this scattering room best for. Such transparent bodies are used to balance or test the Smoke sensitivity used in the manufacture of the detectors (see EP-B-0 658 264).

The frames of the window openings are formed integrally at least in the housings 14 and 15, whereby the tolerances for the smoke sensitivity are reduced. At acquaintances Stray light smoke detectors, the window frames consist of two parts, one of which the ceiling and the other is attached to the bottom of the measuring chamber. When putting on of the floor pass difficulties and it comes to variable window sizes and to form a light gap between the two halves of the window and thus unwanted interference of the transmitting and the receiving light. In the one-piece housing windows Disruptions of this kind are excluded and there can be no problems with the Positioning accuracy of window halves occur. The windows are rectangular or square and between the window openings and the associated light source 12, 12 'and the Lens of the associated light receiver 11 is a relatively large distance, resulting in a gives relatively small aperture angle of the respective light beams. A small opening angle the light rays has the advantage that on the one hand hardly light of the light sources 12, 12 'on the Ground meets and on the other hand, the light receiver 11 does not "see" the ground, so that on the Soil deposited dust particles can not produce disturbing stray light. Another advantage the large distance between the windows and the light source 12, 12 'and the lens of the light receiver 11 is that the light-penetrated optical surfaces lie relatively deep inside the housing and are thus well protected against contamination, which results in a constant sensitivity of the opto-electronic elements.

The labyrinth 7 consists of a bottom and peripherally arranged apertures 16 and it contains flat lid for said housing 13, 14, 15. The bottom and the panels 16 are used for shielding the measuring chamber against extraneous light from the outside and for suppression of the so-called background light (see also EP-A-0 821 330 and EP-A-1 087 352). The peripherally arranged aperture 16 each consist of two legs and have an L-shaped Build up. Due to the shape and the arrangement of the aperture 16, in particular also by their mutual distance, it is ensured that the measuring chamber is sufficient shielded against extraneous light and still their function with an optical test device (EP-B-0 636 266) can be checked. In addition, the panels 16 are arranged asymmetrically, so that smoke from all directions can penetrate similarly well into the measuring chamber.

The directed against the measuring chamber leading edge of the aperture 16 is formed as sharp as possible, so that little light can fall on such an edge and be reflected. ground and ceiling of the measuring chamber, so the facing surfaces of the carrier 6 and labyrinth 7, are grooved, and all surfaces in the measuring chamber, in particular the Apertures 16 and the aforementioned fluted surfaces are shiny and look like black Mirror. This has the advantage that incident light is not diffused but directed is reflected.

The arrangement of the two light sources 12 and 12 'is chosen so that the optical axis of Light receiver 11 with the optical axis of a light source, according to the representation Light source 12, one blunt and with the optical axis of the other light source, according to the representation the light source 12 ', an acute angle includes. The light of the light source 12, 12 'is scattered by penetrating into the measuring chamber smoke and a part of this Stray light falls on the light receiver 11, wherein at an obtuse angle between the optical axes of light source and light receiver of forward scattering and at a acute angle between the optical axes of backward scattering speaks.

It is known that the scattered light generated by forward scattering is significantly larger than which generated by backward scattering, the two scattered light components for different Types of fires are characteristically different. This phenomenon is for example from WO-A-84/01950 (= US-A-4 642 471), where disclosed inter alia is that different for different types of smoke ratio of dispersion at Use a small scattering angle for scattering with a larger scattering angle to detect the type of smoke leaves. The larger spread angle can also be chosen over 90 ° so that the forward angle and the backward scatter is evaluated. The evaluation of the two Light sources 12 and 12 'derived stray light components does not form the subject of the present Registration and will therefore not be described here.

For better discrimination between different aerosols in the beam path transmitter and / or receiver side active or passive polarization filter can be provided. Of the Carrier 6 is prepared accordingly and has provided in the housings 13, 14 and 15 Grooves (not shown) in which polarizing filters can be fixed. As another Option can be used as light sources 12, 12 'diodes, which radiation in the wavelength range of visible light (see EP-A-0 926 646), or the light sources can emit radiation of different wavelengths, for example the one Light source red and the other blue light.

The housing 3 of the smoke detector is constructed essentially in two parts and consists of the already mentioned cover 9 and the optical sensor system 2 comprehensive detector hood 17. The latter consists of an upper annular part and a distance from this, the dome of the detector forming plate, which with the upper annular part is connected by arched or rib-like webs 18. The designated by the reference numeral 19 Gap between the upper and the lower part of the detector hood 17th forms an over the entire housing circumference opening for the ingress of air and Thus, smoke to the optical sensor system 2, this opening only by the relatively narrow Webs 18 is interrupted. There is an even number of webs 18 provided, as shown there are four.

The detector hood 17 and the cover 9 are on the carrier 6 via hook-like snap closures Fixed (not shown) and the entire detector is mounted in the base 1. In the upper Part of the detector hood 17, a ring 20 is inserted, which is an insect screen 21 from a wearing suitable flexible material. When attaching the detector hood 17, the carrier 6 against pressed the ring 20, whereby the insect screen 21 is fixed in the detector. The attachment the detector in the base 1 is done by a kind of bayonet lock. The detector is from below pushed into the base 1, which is due to a guide ribs and guide grooves formed mechanical coding only in a single relative position between detectors and Socket is possible. Then, the detector in the base 1 by an angle of about 20 ° (Fig. 4) rotated, whereby the part of the carrier 6 forming and upwardly projecting from this contact strip 5 tangentially inserted into the socket strip mounted in the socket 1 and the electrical Contact between the connector strip 4 and the contact strip 5 and thus between detectors and Base is made. Subsequently, by the mentioned bayonet catch the Mechanical fixation of the detector in the base 1.

The contact strip 5 is integrated on the upper side of the carrier 6 in so-called insert technique and made in one piece with the carrier 6. Of the plug contacts of the contact strip 5 are the electrical connections to a cast into the carrier 6 stamped part with metallic, conducted against each other insulated metal conductors. The free ends of these metal conductors protrude in addition to the contact strip 5 from the carrier 6 and form contact points for the production of Soldered connections to the evaluation electronics on the printed circuit board 8.

• Für die Herstellung der Steckverbindung ist nur eine einfache Mechanik erforderlich und es muss insbesondere keine Umsetzung einer Rotations- in eine Translationsbewegung erfolgen.
• Die kompakte Steckverbindung erlaubt einfache Schlaufkontakte und besitzt ausgezeichnete Eigenschaften hinsichtlich elektro-magnetischer Verträglichkeit (EMV).

The electrical connection between detector and socket through the two elements connector strip 4 and contact strip 5 has a number of advantages:

• For the production of the connector only a simple mechanism is required and there must be no particular implementation of a rotational in a translational movement.
• The compact connector allows simple loop contacts and has excellent properties with regard to electro-magnetic compatibility (EMC).

As can be seen in FIG. 3, a component is formed on the bottom of the component forming the labyrinth 7 Fastened light conductor 22, on the one hand up to the circuit board 8 and on the other hand by a Bore in the lower part of the detector hood 17 protrudes from the detector hood. The detector hood is in Area of said bore provided with a spherical recess 23, which is the free Surrounds the end of the light guide 22. The light guide 22 serves as a so-called alarm indicator for visual display of alarm conditions of the detector. On the circuit board 8 is for this purpose an LED (not shown) is provided, which is activated in an alarm condition and the Light guide 22 applied with light.

If a detector sends an alarm signal, then usually a visual check is made as to whether also the alarm indicator indicates an alarm. It is clear that the alarm indicator for this Control should be visible on all sides. Where this is not the case, the detectors must be in the interstitial space be mounted so that the alarm indicator is clearly visible from the door. at purely thermal detectors, where no limitations due to the lack of an optical sensor For the arrangement of the alarm indicator, the alarm indicator is often at the detector apex arranged (see US-A-5 450 066). In scattered light smoke detectors this is only with Restrictions possible, because on the one hand in the detector axis and thus by the spreader room guided light guide is out of the question and therefore uses a curved light guide would have to, and on the other hand, the electrical connection to a mounted on the detector apex LED would be too expensive. For this reason, the alarm indicator for scattered light smoke detectors usually arranged on the periphery of the detector (see DE-A-100 54 111) and practically visible only from a very small solid angle, which is the already mentioned Problems related to mounting and positioning of the detectors leads. Suggestions regarding a All-round visibility of the alarm indicator in scattered light smoke detectors go in the direction of annular or strip-shaped light guides over the entire circumference of the detector hood (EP-1 049 061). These solutions are not satisfactory, because a light guide with such a large illuminating area requires a relatively large amount of power so that it shines sufficiently brightly secure detection of alarm indications.

The alarm indicator requires little power and it is because it is in the area of the detector's apex lies, practically visible on all sides. The all-round visibility is only from a perspective from 20 ° to the horizontal, but since the detector is mounted on the ceiling, this is Condition fulfilled in most cases. As can be seen in particular FIG. 2, is the Optical fiber 22 is guided in the region between the housings 14 and 15 through the measuring chamber. The two housings 14 and 15 are connected to each other at their front side and thus form with their inner side surfaces and the connecting surface between these one the light guide 22 surrounding wall, which the scattering space of the measuring chamber against the light guide 22 largely shields.

The smoke detector described so far is a purely optical detector with smoke detection based on the scattered light caused by smoke particles that have penetrated into the measuring chamber. Optionally, the detector can be designed as a two-criteria detector and additionally contain a temperature sensor. According to FIGS. 1 and 2, two temperature sensors 24 formed by NTC resistors are provided, which are arranged in the region of two mutually opposite webs 18. The webs 18 have in the middle of an elongated recess 25, in which from above the temperature sensors 24 protrude, which are mounted on the circuit board 8. Optical thermal detectors are known, so that a description of the signal evaluation is omitted here. Of course, the detector could contain other sensors, such as a fire gas sensor (CO, NO _x ), which could be arranged at correspondingly small dimensions within the measuring chamber.

The smoke detector described so far is a purely optical detector with smoke detection based on the scattered light caused by smoke particles that have penetrated into the measuring chamber. Optionally, the detector can be designed as a two-criteria detector and additionally contain a temperature sensor. According to FIGS. 1 and 2, two temperature sensors 24 formed by NTC resistors are provided, which are arranged in the region of two mutually opposite webs 18. The webs 18 have in the middle of an elongated recess 25, in which from above the temperature sensors 24 protrude, which are mounted on the circuit board 8. Optical thermal detectors are known, so that a description of the signal evaluation is omitted here. Of course, the detector could contain other sensors, such as a fire gas sensor (CO, NO _x ), which could be arranged at correspondingly small dimensions within the measuring chamber.

While arranged in the axis of the detector temperature sensors completely independent of direction are, there is a strong directional dependence in a peripherally arranged sensor and the response depends on whether the sensor is facing the fire or is located on the side facing away from this of the detector. This problem is caused by the Use of two opposing temperature sensors 24 solved. For details, in the description of Figures 6 to 8. It is essential that the detector is independent of the flow direction has a homogeneous, rotationally symmetric sensitivity. These is achieved by the webs 18 in cooperation with the labyrinth 7, wherein the webs 18th on the one hand protect the temperature sensors 24 against mechanical forces and the Air optimally lead to the sensors and on the other hand in cooperation with the labyrinth. 7 guide the air outside along the housing.

As already mentioned in the introduction, today are optical, optical-thermal and thermal fire detectors in use, with these still come gas detectors can. In addition, the optical, thermal and optical thermal detectors additionally have a fire gas sensor. The detector shown in FIGS. 1 to 5 covers the variants optical and optical-thermal (possibly supplemented by a fire gas sensor) from, of course, provided in the purely optical detector no temperature sensors 24 are. Apart from that, but is the detector structure in the two previously described Variants mechanically completely the same.

As will now be explained with reference to Figures 6 to 8, the detector without conceptual Changes to base or housing also serve as the basis for a purely thermal detector. Since thus the main mechanical components and the structure of the detector in all cases are always the same, is a family of fire detectors with sensors for different fire parameters proposed that with a single, in all cases the same housing and a single socket and thus allows substantial savings.

• Die Lichtquellen 12 und 12' und der Lichtempfänger 11 sind weggelassen,
• der Ring 20 und das Gitter 21 sind weggelassen,
• das Labyrinth 7 ist weggelassen und durch eine Abdeckplatte 26 ersetzt.

The thermal fire detector illustrated in FIGS. 6 to 8 differs essentially from the optical-thermal detector shown in FIGS. 1 to 5 by the following features:

• The light sources 12 and 12 'and the light receiver 11 are omitted,
• the ring 20 and the grid 21 are omitted,
• the labyrinth 7 is omitted and replaced by a cover plate 26.

The cover plate 26 is a very essential part of the thermal fire detector because it is under allows one and the same carrier 6 to be used for the different types of detectors can be. As can be seen in particular Fig. 7, which is a view the cover plate 26 shows from below, this has adapted to the contour of the housing 13, 14 and 15 Openings through which said housing with their lower ends protrude. In addition, elastic tongues 27, 28 and 29 are provided on the cover plate 26, which serve to cover the housing 13, 14, 15 and are snapped into this. Moreover the cover plate 26 has a tubular holder 30 for the light guide 22, two openings for the temperature sensors 24 and a partition extending therebetween 31, which serves to achieve a directed air flow.

The partition 31 provides a significant contribution to the described thermal Fire detector has a homogeneous sensitivity and the strict requirements of Standard EN 54/5, class A1 met. Together with the webs 18, the partition 31 leads the incoming air through the housing to the sensors 24th

When evaluating the signals of the two temperature sensors 24 can be either the take into account the higher value or the mean value, but you can also weight both values and together for evaluation. The response of the temperature sensors provides an indication of the location of the fire by assuming that the fire located on the detector side with the sensor providing the higher temperature value.

Another advantage of using two temperature sensors 24 is in the associated one Redundancy. The two sensors monitor each other and drifting or Aging can be detected much earlier than with just one sensor. The monitoring of both Sensors over a longer period of time must result in both about the same temperature. If not, one of the sensors has a fault.

In the optical-thermal detector shown in Figures 1 to 5 can be through the Using a double photodiode as a light receiver 11 optimal redundancy (two Light transmitter, two light receivers, two temperature sensors).

• Alle Melder sehen gleich aus, zumindest dann, wenn man sie aus dem üblichen Abstand von mehr als 2 m betrachtet;
• die Melder sind flach und "einstöckig";
• die Melder sind modular aufgebaut und damit kostengünstig herstellbar.

FIGS. 1 to 8 do not show a single detector but a detector system, which is distinguished by three main features:

• All detectors look the same, at least when viewed from the usual distance of more than 2 meters;
• the detectors are flat and "one-story";
• the detectors have a modular structure and can therefore be produced cost-effectively.

Each detector of the system, regardless of single or Mehrkriterien-, whether optical or thermal Detector has the same base 1, the same housing 3 and the same carrier 6. The individual detectors differ only in the detection module, this is the respective sensor arrangement. The detection module for an optical detector consists of the carrier 6, the optoelectronic elements 11, 12, 12 ', the labyrinth 7 and the grid 21 with the ring 20, the detection module for a thermal detector from the carrier 6, the thermal sensors 24th and the cover plate 26, and the detection module for an optical-thermal detector the carrier 6, the opto-electronic elements 11, 12, 12 ', the labyrinth 7, the grid 21st with the ring 20 and the thermal sensors 24, of course, the circuit board 8 also is specific to the detector type.

As an additional detection module such is possible for a gas detector, wherein the relevant If possible, sensor would also be mounted on the carrier 6. Another Possibility is the gas sensor laterally next to the fire detector or in a separate, remote from the detector and preferably arranged laterally next to this or to be arranged on this molded, housing. Possibilities for further modules are For example, a module for measuring the radiation power, a camera, or an alarm module with an acoustic alarm (see EP 01 128 683.8).

Claims (17)

Fire detector with a detector insert, which has a sensor arrangement (2) and evaluation electronics, and with a housing (3) surrounding the sensor arrangement (2) with openings for the admission of air and possibly smoke to the sensor arrangement (2), characterized in that A detector is of modular design and designed to accommodate detection modules with sensors (11, 12, 12 ', 24) for different fire parameters, all detection modules being compatible with a single housing (3). Fire detector according to claim 1, characterized in that the sensor arrangement (2) and the said access openings are arranged substantially on one level. Fire detector according to claim 2, characterized in that the detection modules have a same for all types of detectors and usable in the detector carrier plate (6), which is designed to receive the sensors (11, 12, 12 ', 24) for the different fire characteristics. Fire detector according to claim 3, characterized in that the carrier plate (6) has at its the detector tip facing the bottom housing (13, 14, 15) for receiving components of an electro-optical sensor system (2) and at its top for holding a transmitter supporting circuit board (8) is formed. Fire detector according to claim 2, characterized in that the housing (3) has a detector hood (17), which consists of an annular upper and a spaced from this and forming the tip of the detector lower part. Fire detector according to claim 5, characterized in that the intermediate space (19) between the two parts of the detector hood (17) forms said access openings and said lower part is connected to the upper part by arcuate or rib-like webs (18). Fire detector according to one of claims 4 to 6, characterized in that an optical detection module is provided for the measurement of smoke-induced scattered light, which comprises at least one light source (12, 12 '), a light receiver (11), a measuring chamber and a labyrinth system ( 7) with diaphragms (16) arranged at the periphery of the measuring chamber, wherein the at least one light source (12, 12 ') and the light receiver (11) in the housings (14, 15, 13) on the underside of the carrier plate (6) are fixed and the labyrinth system (7) formed lid-like and on the support plate (6) can be fixed. Fire detector according to one of claims 4 to 6, characterized in that a thermal detection module with two temperature sensors (24) is provided, which are mounted radially opposite one another on the printed circuit board (8) and protrude from the latter through the support plate (6) downwards , Fire detector according to claims 6 and 8, characterized in that the said webs (18) in the form of wings or flaps with a vertically extending recess (25) are formed and provided in an even number, and that the temperature sensors (24) from above each against one of the webs (18) protrude that their free ends lie directly in or behind the recess (25). Fire detector according to Claims 4 and 9, characterized in that the thermal detection module has a cover plate (26) which can be fixed on the carrier plate (6) for covering the housing (13, 14, 15) provided for the electrooptical sensor system (2), and in that openings are provided on the cover plate (26) for the passage of the temperature sensors (24) and a dividing wall (31) extending in the radial direction between the temperature sensors (24) to achieve a directed air flow. Fire detector according to one of claims 4 to 6, characterized in that an optical-thermal detection module for the measurement of scattered light caused by smoke and for temperature measurement is provided, which has an electro-optical sensor system (2) and two temperature sensors (24), the latter are arranged laterally next to the optical sensor system (2). Fire detector according to claims 4, 6 and 11, characterized in that the temperature sensors (24) are mounted radially opposite each other on the printed circuit board (8) and lie with their free ends in the region of one of said webs (18). Fire detector according to claim 9 or 12, characterized in that the webs (18) are formed so that they on the one hand protect the temperature sensors (24) from mechanical effects and on the other hand ensure an undisturbed as possible air flow of Temperatusensoren (24). Fire detector according to claims 4 and 5, characterized in that on the bottom of the labyrinth system (7) a light guide (22) is fixed, which is guided upwards to the printed circuit board (8) and forms part of an alarm display visible in the region of the detector vertex. Fire detector according to one of Claims 1 to 14, characterized by a base (1) associated with the fire detector with a multi-pole connector strip (4) and by a contact strip (5) arranged in the fire detector, which is tangential by rotation of the detector relative to the base (1) in the connector strip (4) can be inserted. Fire detector according to claims 4 and 15, characterized in that the contact strip (5) on the support plate (6) is integrated in insert technology. Fire detector according to one of claims 1 to 16, characterized in that an alarm module is provided with an acoustic alarm, which is arranged in a separate, remote from the fire detector and preferably arranged laterally next to this or molded onto this, housing.

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