EP0257325A1 - Smoke detector for early fire detection - Google Patents
Smoke detector for early fire detection Download PDFInfo
- Publication number
- EP0257325A1 EP0257325A1 EP87110940A EP87110940A EP0257325A1 EP 0257325 A1 EP0257325 A1 EP 0257325A1 EP 87110940 A EP87110940 A EP 87110940A EP 87110940 A EP87110940 A EP 87110940A EP 0257325 A1 EP0257325 A1 EP 0257325A1
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- European Patent Office
- Prior art keywords
- cover
- housing
- smoke detector
- detector according
- air inlet
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- 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
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
- G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
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- 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
Definitions
- the invention relates to a smoke detector for early fire detection with a detector base, with a housing that has air inlet openings, and with a cover cap that has an annular air inlet slot, wherein a measuring chamber with a measuring system is arranged inside the housing.
- a measuring system is arranged in a measuring chamber for the two different types of detectors.
- a housing that encloses the measuring chamber protects the measuring system and the measuring chamber.
- the air or smoke must be let in as freely as possible, on the other hand, disturbing influences such as dust, extraneous light in the case of a scattered light detector, or wind in the case of an ionization detector should be shielded as well as possible.
- disturbing influences such as dust, extraneous light in the case of a scattered light detector, or wind in the case of an ionization detector should be shielded as well as possible.
- the penetration behavior is independent of the direction of flow, so that the detector has the same sensitivity on all sides.
- Known detectors often have a housing and a measuring system that is rotationally symmetrical.
- the object of the invention is therefore to avoid the disadvantages described above and to design a smoke detector in such a way that it has improved penetration behavior.
- the housing which surrounds the measuring chamber is formed in one piece by a closed side wall and a housing cover, that the housing cover has a plurality of small holes, at least in the region of the measuring chamber, that the cover cap is arranged at a certain distance from the housing cover, and that at least three approximately radially extending ribs are arranged symmetrically between the housing cover and the cover cap.
- the smoke detector designed according to the invention uses a simple, non-rotationally symmetrical measuring system in connection with a smoke supply system arranged within the cover cap in such a way that uniformly rapid smoke penetration is achieved from all sides.
- the all-round side wall of the housing is closed, but has a large number of air inlet openings on the housing cover - in the case of a detector mounted on the ceiling on the underside of the detector.
- the air flow is thus changed such that the smoke is evenly introduced from below to the measuring chamber, past the labyrinth side (scattered light detector). This occurs from the outside Air or smoke through the circular air inlet slot running all around to the detector and then takes the route via the intended air duct.
- the ribs provided between the housing cover and the cover cap ensure that the smoke cannot flow past between the measuring system or housing cover of the measuring chamber and the cover cap. This advantageously forces the smoke to flow evenly into the measuring chamber.
- the annular air inlet slot is arranged in the area of the detector base. This has the advantage that the penetrating smoke is guided past the sides of the housing downwards, where it then enters the measuring system evenly through the many holes.
- This arrangement of the air inlet slot on the detector at the top is particularly advantageous in the case of scattered light detectors, because in this way both the extraneous light and the dust can only get into the measuring system after being deflected several times and thus no longer cause any malfunctions.
- the air inlet slot on the smoke detector is expediently arranged at the bottom, ie in the area of the housing cover.
- This enables faster smoke to enter. This is ensured in particular if, expediently, only the housing cover is convex and the cover cap is concave, so that a funnel-shaped air or smoke entry path is formed between them.
- This has the advantage that the air flow is accelerated and a faster response of the smoke detector is possible.
- it can be useful for example, to prevent direct external light from penetrating into the holes and thus into the Prevent measuring system to form the ribs as spiral arms that run radially outwards from the center.
- Fig. 1 shows a conventional scattered light detector, partly in section and correspondingly a section II-II according to FIG. 1 in FIG. 2 in plan view.
- the housing GH in which the measuring chamber MK with the signaling system is located, is placed on the detector base MS. Laterally, through the side walls SW of the housing, there are inlet openings for the smoke.
- a labyrinth LAB is formed within the housing GH and consists of a large number of specially arranged lamellae LA.
- a cover cap AK is placed over the housing GH and has an air inlet slot RS running all around, through which the smoke flows to the housing and then through the lateral air inlet openings through the labyrinth to the measuring chamber.
- a detector according to the invention is shown in side view, partly in section.
- the section IV-IV in plan view in Fig.4.
- the housing GH is arranged on the detector base MS.
- the housing GH is formed by an all-round closed side wall SW and a housing cover GD, both of which are made in one piece.
- the MK measuring chamber with the alarm measuring system is located inside the housing.
- a cover cap AK is placed over the housing GH and has a certain distance between the housing cover GD and the cover cap AK which is also convex in this case.
- the annular air inlet slot RS is arranged in the area of the detector base MS. At least in the area of the measuring chamber MK, the air inlet holes LO are arranged, which can be of uneven size and can be arranged unevenly.
- the smoke which penetrates through the ring slot RS of the cover cap AK is guided past the side wall SW of the housing GH and is forcibly guided evenly into the measuring chamber by means of the ribs RI through the holes LO.
- the ribs RI between the housing cover GD and the cover cap AK prevent the smoke from flowing past the measuring system.
- the ribs RI can be designed differently and can be formed either on the housing cover GD or on the inside of the cover cap AK.
- the arrangement of the ring slot RS at the top of the detector, ie in the area of the detector base MS, means that both extraneous light and dust can only get into the measuring chamber after it has been deflected several times.
- FIG. 5 again shows a side view, partially in section, of a smoke detector with particularly good penetration behavior.
- the sectional drawing according to VI-VI according to FIG. 5 is shown in plan view in FIG. 6.
- the annular air inlet slot is at the bottom of the detector, i.e. arranged in the area of cover cap AK and housing cover GD.
- the cover cap AK is concave, while the housing cover GD of the housing GH is convex.
- a conical smoke inlet path is formed, which like a funnel accelerates the penetration of the air flow and thus the smoke.
- the ribs RI are designed as spiral arms that run outwards from the center. With this configuration, a uniform and rapid smoke entry is achieved from all sides.
- any remaining directional dependencies can be eliminated by making the number and arrangement of the holes LO uneven and the size of the holes different.
- the inventive one Smoke detector In contrast to the known detector, as shown in Figures 1 and 2, where parts of the measuring system through the labyrinth LAB, the transmitter optics SO and the receiver optics EO oppose different flow resistances to the smoke, so that it leads to a directional dependence, the inventive one Smoke detector an improved, uniform and also accelerating smoke entry behavior.
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
Description
Die Erfindung bezieht sich auf einen Rauchmelder zur Brandfrüherkennung mit einem Meldersockel, mit einem Gehäuse, das Lufteintrittsöffnungen aufweist, und mit einer Abdeckkappe, die einen ringförmigen Lufteinlaß-Schlitz aufweist, wobei im Gehäuseinneren eine Meßkammer mit einem Meßsystem angeordnet ist.The invention relates to a smoke detector for early fire detection with a detector base, with a housing that has air inlet openings, and with a cover cap that has an annular air inlet slot, wherein a measuring chamber with a measuring system is arranged inside the housing.
Zur Brandfrüherkennung werden vorwiegend Rauchmelder verwendet, die entweder nach dem Ionisations- oder nach dem Streulicht-Prinzip arbeiten. Für die beiden verschiedenartigen Meldertypen ist in einer Meßkammer ein Meßsystem angeordnet. Ein Gehäuse, das die Meßkammer umschließt, schützt das Meßsystem und die Meßkammer. Dabei muß einerseits die Luft bzw. der Rauch möglichst ungehindert eingelassen werden, andererseits sollen störende Einflüsse, wie Staub, Fremdlicht im Falle eines Streulichtmelders, oder Wind im Falle eines Ionisationsmelders möglichst gut abgeschirmt werden. Darüberhinaus ist erforderlich, daß das Eindringverhalten unabhängig von der Anströmrichtung ist, so daß der Melder nach allen Seiten die gleiche Ansprechempfindlichkeit besitzt. Bekannte Melder weisen häufig ein Gehäuse und ein Meßsystem auf, das rotationssymmetrisch ausgeführt ist. Da aber bereits kleine Inhomogenitäten aus strömungstechnischen Gründen große Auswirkungen haben, ist hierfür insbesondere beim Streulichtmelder ein großer Aufwand erforderlich. Deshalb werden besonders beim Streulicht melder, keine rotationssymmetrischen Systeme verwendet und entsprechend schlechtere Gleichmäßigkeiten in Kauf genommen.For early fire detection, smoke detectors are mainly used, which work either according to the ionization or the scattered light principle. A measuring system is arranged in a measuring chamber for the two different types of detectors. A housing that encloses the measuring chamber protects the measuring system and the measuring chamber. On the one hand, the air or smoke must be let in as freely as possible, on the other hand, disturbing influences such as dust, extraneous light in the case of a scattered light detector, or wind in the case of an ionization detector should be shielded as well as possible. It is also necessary that the penetration behavior is independent of the direction of flow, so that the detector has the same sensitivity on all sides. Known detectors often have a housing and a measuring system that is rotationally symmetrical. However, since even small inhomogeneities have great effects for fluidic reasons, a great deal of effort is required, particularly in the case of the scattered light detector. Therefore, especially when it comes to stray light detectors, no rotationally symmetrical systems are used and correspondingly worse uniformities are accepted.
Aufgabe der Erfindung ist es daher, oben geschilderte Nachteile zu vermeiden und einen Rauchmelder derart auszubilden, daß er ein verbessertes Eindringverhalten aufweist.The object of the invention is therefore to avoid the disadvantages described above and to design a smoke detector in such a way that it has improved penetration behavior.
Diese Aufgabe wird bei einem oben geschilderten Rauchmelder erfindungsgemäß dadurch gelöst, daß das Gehäuse, welches die Meßkammer umschließt, einstückig von einer geschlossenen Seitenwand und einem Gehäusedeckel gebildet ist, daß der Gehäusedeckel zumindest im Bereich der Meßkammer eine Vielzahl von kleinen Löchern aufweist, daß die Abdeckkappe in einem bestimmten Abstand zum Gehäusedeckel angeordnet ist, und daß zwischen dem Gehäusedeckel und der Abdeckkappe zumindest drei annähernd radial verlaufende Rippen symmetrisch angeordnet sind.This object is achieved in a smoke detector described above in that the housing which surrounds the measuring chamber is formed in one piece by a closed side wall and a housing cover, that the housing cover has a plurality of small holes, at least in the region of the measuring chamber, that the cover cap is arranged at a certain distance from the housing cover, and that at least three approximately radially extending ribs are arranged symmetrically between the housing cover and the cover cap.
Der erfindungsgemäß gestaltete Rauchmelder verwendet ein einfaches, nicht rotationssymmetrisches Meßsystem in Verbindung mit einem derartig innerhalb der Abdeckkappe angeordneten Rauchzuführungssystem, daß ein gleichmäßig rasches Raucheindringen von allen Seiten erreicht wird. Im Gegensatz zu herkömmlichen Rauchmeldern ist die rundum verlaufende Seitenwand des Gehäuses geschlossen, weist aber auf dem Gehäusedeckel - bei einem an der Raumdecke montierten Melder auf der Unterseite des Melders - eine Vielzahl von Lufteintrittsöffnungen auf. Bei dem erfindungsgemäßen Rauchmelder ist also die Luftführung derart geändert, daß der Rauch an der Labyrinthseite (Streulichtmelder) vorbei von unten gleichmäßig zur Meßkammer eingeführt wird. Dabei tritt von außen die Luft bzw. der Rauch durch den ringsum laufenden, ringförmigen Lufteinlaßschlitz zum Melder ein und nimmt dann den Weg über die vorgesehene Luftführung. Die zwischen dem Gehäusedeckel und der Abdeckkappe vorgesehenen Rippen sorgen dafür, daß der Rauch zwischen dem Meßsystem bzw. Gehäusedeckel der Meßkammer und der Abdeckkappe nicht vorbeiströmen kann. Hierdurch wird in vorteilhafter Weise ein gleichmäßiges Einströmen des Rauches in die Meßkammer erzwungen.The smoke detector designed according to the invention uses a simple, non-rotationally symmetrical measuring system in connection with a smoke supply system arranged within the cover cap in such a way that uniformly rapid smoke penetration is achieved from all sides. In contrast to conventional smoke detectors, the all-round side wall of the housing is closed, but has a large number of air inlet openings on the housing cover - in the case of a detector mounted on the ceiling on the underside of the detector. In the smoke detector according to the invention, the air flow is thus changed such that the smoke is evenly introduced from below to the measuring chamber, past the labyrinth side (scattered light detector). This occurs from the outside Air or smoke through the circular air inlet slot running all around to the detector and then takes the route via the intended air duct. The ribs provided between the housing cover and the cover cap ensure that the smoke cannot flow past between the measuring system or housing cover of the measuring chamber and the cover cap. This advantageously forces the smoke to flow evenly into the measuring chamber.
In einer vorteilhaften Ausgestaltung der Erfindugn ist der ringförmige Lufteinlaßschlitz im Bereich des Meldersockels angeordnet. Dies hat den Vorteil, daß der eindringende Rauch an den Seiten des Gehäuses vorbei nach unten geführt wird, wo er dann durch die vielen Löcher gleichmäßig in das Meßsystem eintritt. Diese Anordnung des Lufteinlaßschlitzes am Melder oben ist besonders vorteilhaft bei Streulichtmeldern, weil hierdurch sowohl das Fremdlicht als auch der Staub erst nach mehrmaliger Umlenkung in das Meßsystem gelangen können und somit keine Störungen mehr verursachen.In an advantageous embodiment of the invention, the annular air inlet slot is arranged in the area of the detector base. This has the advantage that the penetrating smoke is guided past the sides of the housing downwards, where it then enters the measuring system evenly through the many holes. This arrangement of the air inlet slot on the detector at the top is particularly advantageous in the case of scattered light detectors, because in this way both the extraneous light and the dust can only get into the measuring system after being deflected several times and thus no longer cause any malfunctions.
In einer weiteren Ausgestaltung der Erfindung ist zweckmäßigerweise der Lufteinlaßschlitz am Rauchmelder unten, d.h. im Bereich des Gehäusedeckels, angeordnet. Dadurch wird ein schnellerer Raucheintritt ermöglicht. Dies ist insbesondere dann gewährleistet, wenn zweckmäßigerweise nur der Gehäusedeckel konvex die Abdeckkappe hingegen konkav ausgebildet sind, so daß dazwischen ein trichterförmiger Luft- bzw. Raucheintrittsweg gebildet ist. Dies hat den Vorteil, daß der Luftstrom beschleunigt wird und somit ein schnelleres Ansprechen des Rauchmelders möglich ist. Bei einem derartig ausgebildeten Rauchmelder kann es zweckmäßig sein, beispielsweise um das Eindringen von direktem Fremdlicht in die Löcher und damit in das Meßsystem zu verhindern, die Rippen als Spiralarme auszubilden, die von der Mitte her radial nach außen verlaufen.In a further embodiment of the invention, the air inlet slot on the smoke detector is expediently arranged at the bottom, ie in the area of the housing cover. This enables faster smoke to enter. This is ensured in particular if, expediently, only the housing cover is convex and the cover cap is concave, so that a funnel-shaped air or smoke entry path is formed between them. This has the advantage that the air flow is accelerated and a faster response of the smoke detector is possible. In a smoke detector designed in this way, it can be useful, for example, to prevent direct external light from penetrating into the holes and thus into the Prevent measuring system to form the ribs as spiral arms that run radially outwards from the center.
Weitere Ausgestaltungen und Vorteile der Erfindung ergeben sich aus den weiteren Unteransprüchen.Further refinements and advantages of the invention result from the further subclaims.
Anhand der Zeichnung wird die Erfindung näher erläutert. Dabei zeigen
- Fig. 1 und 2 einen herkömmlichen Melder am Beispiel eines Streulichtmelders,
- Fig. 3 und 4 ein Ausführungsbeispiel eines erfindungsgemäßen Melders,
- Fig. 5 und 6 ein weiteres Ausführungsbeispiel eines erfindungsgemäßen Melders.
- 1 and 2 a conventional detector using the example of a scattered light detector,
- 3 and 4 an embodiment of a detector according to the invention,
- 5 and 6 another embodiment of a detector according to the invention.
Fig. 1 zeigt einen herkömmlichen Streulichtmelder teils im Schnitt und entsprechend dazu einen Schnitt II-II gemäß Fig. 1 in Fig.2 in Draufsicht. Auf dem Meldersockel MS ist das Gehäuse GH aufgesetzt, in dem sich die Meßkammer MK mit dem Meldesystem befindet. Seitlich, d.h.an den Seitenwänden SW des Gehäuses, sind Eintrittsöffnungen für den Rauch. Innerhalb des Gehäuses GH ist ein Labyrinth LAB gebildet, das aus einer Vielzahl von besonders angeordneten Lamellen LA besteht. Über das Gehäuse GH ist eine Abdeckkappe AK gestülpt, die ringsum verlaufend einen Lufteinlaßschlitz RS aufweist, durch den der Rauch zum Gehäuse hin und dann durch die seitlichen Lufteintrittsöffnungen durch das Labyrinth zur Meßkammer hin einströmt.Fig. 1 shows a conventional scattered light detector, partly in section and correspondingly a section II-II according to FIG. 1 in FIG. 2 in plan view. The housing GH, in which the measuring chamber MK with the signaling system is located, is placed on the detector base MS. Laterally, through the side walls SW of the housing, there are inlet openings for the smoke. A labyrinth LAB is formed within the housing GH and consists of a large number of specially arranged lamellae LA. A cover cap AK is placed over the housing GH and has an air inlet slot RS running all around, through which the smoke flows to the housing and then through the lateral air inlet openings through the labyrinth to the measuring chamber.
In Fig. 3 ist in Seitenansicht, teilweise im Schnitt, ein erfindungsgemäßer Melder dargestellt. Entsprechend dazu der Schnitt IV-IV in Draufsicht in Fig.4. Auf dem Meldersockel MS ist das Gehäuse GH angeordnet. Das Gehäuse GH ist von einer ringsum geschlossenen Seitenwand SW und einem Gehäusedeckel GD, die beide aus einem Stück gefertigt sind, gebildet. Im Inneren des Gehäuses befindet sich die Meßkammer MK mit dem Meldemeßsystem. Über das Gehäuse GH ist eine Abdeckkappe AK gestülpt, die zwischen dem Gehäusedeckel GD und der in diesem Fall ebenfalls konvex ausgebildeten Abdeckkappe AK einen bestimmten Abstand aufweist. Im Bereich des Meldersockels MS ist der ringförmige Lufteinlaßschlitz RS angeordnet. Zumindest im Bereich der Meßkammer MK sind die Lufteintrittslöcher LO angeordnet, die von ungleichmäßiger Größe sein können und ungleichmäßig angeordnet sein können.In Fig. 3, a detector according to the invention is shown in side view, partly in section. Correspondingly, the section IV-IV in plan view in Fig.4. The housing GH is arranged on the detector base MS. The housing GH is formed by an all-round closed side wall SW and a housing cover GD, both of which are made in one piece. The MK measuring chamber with the alarm measuring system is located inside the housing. A cover cap AK is placed over the housing GH and has a certain distance between the housing cover GD and the cover cap AK which is also convex in this case. The annular air inlet slot RS is arranged in the area of the detector base MS. At least in the area of the measuring chamber MK, the air inlet holes LO are arranged, which can be of uneven size and can be arranged unevenly.
In Fig. 4 sieht man die hier symmetrisch angeordneten vier Rippen RE. Bei diesem Ausführungsbeispiel des erfindungsgemäßen Rauchmelders wird der Rauch, der durch den Ringschlitz RS der Abdeckkappe AK eindringt, an der Seitenwand SW des Gehäuses GH vorbeigeführt und erzwungenermaßen mittels der Rippen RI durch die Löcher LO gleichmäßig in die Meßkammer geführt. Die Rippen RI zwischen dem Gehäusedeckel GD und der Abdeckkappe AK verhindern ein Vorbeiströmen des Rauches am Meßsystem. Dabei können die Rippen RI unterschiedlich ausgestaltet sein und entweder auf dem Gehäusedeckel GD oder auf der Innenseite der Abdeckkappe AK angeformt sein. Die Anordnung des Ringschlitzes RS oben am Melder, d.h. im Bereich des Meldersockels MS, bewirkt, daß sowohl Fremdlicht als auch Staub erst nach mehrmaliger Umlenkung in die Meßkammer gelangen können. Das hat den Vorteil, daß ein wie bei bekannten Meldern bekanntes, kompliziert aufgebautes Labyrinth aus einer Vielzahl von unterschiedlich angeordneten Lamellen entfallen kann. Dies ist auch bei einem weiteren Ausführungsbeispiel, wie es in der Fig. 5 und 6 dargestellt ist, möglich.4 shows the four ribs RE arranged symmetrically here. In this exemplary embodiment of the smoke detector according to the invention, the smoke which penetrates through the ring slot RS of the cover cap AK is guided past the side wall SW of the housing GH and is forcibly guided evenly into the measuring chamber by means of the ribs RI through the holes LO. The ribs RI between the housing cover GD and the cover cap AK prevent the smoke from flowing past the measuring system. The ribs RI can be designed differently and can be formed either on the housing cover GD or on the inside of the cover cap AK. The arrangement of the ring slot RS at the top of the detector, ie in the area of the detector base MS, means that both extraneous light and dust can only get into the measuring chamber after it has been deflected several times. This has the advantage that what is known from known detectors is complicated built labyrinth of a variety of differently arranged slats can be omitted. This is also possible in a further exemplary embodiment, as shown in FIGS. 5 and 6.
Fig. 5 zeigt wiederum in Seitenansicht, teilweise geschnitten, einen Rauchmelder mit besonders gutem Eindringverhalten. Entsprechend dazu ist in Fig. 6 die Schnittzeichnung gemäß VI-VI nach Fig. 5 in Draufsicht dargestellt. Bei diesem Ausführungsbeispiel ist der ringförmige Lufteinlaßschlitz unten am Melder, d.h. im Bereich von Abdeckkappe AK und Gehäusedeckel GD angeordnet. Ferner ist die Abdeckkappe AK konkav ausgebildet, während der Gehäusedeckel GD des Gehäuses GH konvex ausgebildet ist. Dadurch ist ein konisch nach außen sich öffnender Raucheintrittsweg gebildet, der wie ein Trichter das Eindringen des Luftstroms und damit des Rauches beschleunigt. Die Rippen RI sind als Spiralarme, die vom Zentrum nach außen verlaufen, ausgebildet. Mit dieser Ausgestaltung wird ein von allen Seiten her gleichmäßiger und rascher Raucheintritt erreicht. Dabei wird dennoch das Eindringen von direktem Fremdlicht in die Löcher LO des Meßsystems bzw. der Meßkammer MK verhindert. Ein derartig ausgebildeter Melder führt daher zu einem schnelleren Ansprechen. Zweckmäßigerweise können evtl. verbleibende Richtungsabhängigkeiten dadurch behoben werden, daß die Anzahl und die Anordnung der Löcher LO ungleichmäßig und die Größe der Löcher unterschiedlich ist.5 again shows a side view, partially in section, of a smoke detector with particularly good penetration behavior. Correspondingly, the sectional drawing according to VI-VI according to FIG. 5 is shown in plan view in FIG. 6. In this embodiment, the annular air inlet slot is at the bottom of the detector, i.e. arranged in the area of cover cap AK and housing cover GD. Furthermore, the cover cap AK is concave, while the housing cover GD of the housing GH is convex. As a result, a conical smoke inlet path is formed, which like a funnel accelerates the penetration of the air flow and thus the smoke. The ribs RI are designed as spiral arms that run outwards from the center. With this configuration, a uniform and rapid smoke entry is achieved from all sides. The penetration of direct external light into the holes LO of the measuring system or the measuring chamber MK is nevertheless prevented. A detector designed in this way therefore leads to faster response. Advantageously, any remaining directional dependencies can be eliminated by making the number and arrangement of the holes LO uneven and the size of the holes different.
Im Gegensatz zu dem bekannten Melder, wie er in den Figuren 1 und 2 gezeigt ist, wo Teile des Meßsystems durch das Labyrinth LAB, die Sendeoptik SO und die Empfangsoptik EO dem Raucheintritt unterschiedliche Strömungswiderstände entgegensetzen, sodaß es zu einer Richtungsabhängigkeit führt, weist der erfindungsgemäße Rauchmelder ein verbessertes, gleichmäßiges und auch beschleunigendes Raucheintrittsverhalten auf.In contrast to the known detector, as shown in Figures 1 and 2, where parts of the measuring system through the labyrinth LAB, the transmitter optics SO and the receiver optics EO oppose different flow resistances to the smoke, so that it leads to a directional dependence, the inventive one Smoke detector an improved, uniform and also accelerating smoke entry behavior.
Claims (10)
dadurch gekennzeichnet, daß das Gehäuse (GH), welches die Meßkammer (MK) umschließt, einstückig von einer geschlossenen Seitenwand (SW) und einem Gehäusedeckel (GD) gebildet ist, daß der Gehäusedeckel (GD) zumindest im Bereich der Meßkammer (MK) eine Vielzahl von kleinen Löchern (LO) aufweist, daß die Abdeckkappe (AK) in einem bestimmten Abstand zum Gehäusedeckel (GD) angeordnet ist, und daß zwischen dem Gehäusedeckel (GD) und der Abdeckkappe (AK) zumindest drei, annähernd radial verlaufende Rippen (RI) symmetrisch angeordnet sind.1. Smoke detector for early fire detection with a detector base (MS), with a housing (GH), which has air inlet openings, and with a cover cap (AK), which has an annular air inlet slot (RS), with a measuring chamber (MK) inside the housing is arranged with a measuring system,
characterized in that the housing (GH) which surrounds the measuring chamber (MK) is formed in one piece by a closed side wall (SW) and a housing cover (GD), that the housing cover (GD) at least in the region of the measuring chamber (MK) A plurality of small holes (LO) has that the cover cap (AK) is arranged at a certain distance from the housing cover (GD) and that between the housing cover (GD) and the cover cap (AK) at least three, approximately radially extending ribs (RI ) are arranged symmetrically.
dadurch gekennzeichnet, daß der ringförmige Lufteinlaß-Schlitz (RS) im Bereich des Meldersockels (MS) angeordnet ist.2. Smoke detector according to claim 1,
characterized in that the annular air inlet slot (RS) is arranged in the area of the detector base (MS).
dadurch gekennzeichnet, daß der ringförmige Lufteinlaß-Schlitz (RS) im Bereich des Gehäusedeckels (GD) angeordnet ist.3. Smoke detector according to claim 1,
characterized in that the annular air inlet slot (RS) is arranged in the region of the housing cover (GD).
dadurch gekennzeichnet, daß die Abdeckkappe (AK) und der Gehäusedeckel (GD) konvex ausgebildet sind.4. Smoke detector according to one of the preceding claims,
characterized in that the cover cap (AK) and the housing cover (GD) are convex.
dadurch gekennzeichnet, daß die Abdeckkappe (AK) konkav ausgebildet ist.5. Smoke detector according to one of the preceding claims,
characterized in that the cover cap (AK) is concave.
dadurch gekennzeichnet, daß vier symmetrisch angeordnete Rippen (RI) zwischen Gehäusedeckel (GD) und Abdeckkappe (AK) vorgesehen sind.6. Smoke detector according to one of the preceding claims,
characterized in that four symmetrically arranged ribs (RI) are provided between the housing cover (GD) and cover cap (AK).
dadurch gekennzeichnet, daß die Rippen (RI) als Spiralarme ausgebildet sind.7. Smoke detector according to one of the preceding claims,
characterized in that the ribs (RI) are designed as spiral arms.
dadurch gekennzeichnet, daß die Rippen (RI) auf dem Gehäusedeckel (GD) oder auf der Innenseite der Abdeckkappe (AK) angeformt sind.8. Smoke detector according to one of the preceding claims,
characterized in that the ribs (RI) are integrally formed on the housing cover (GD) or on the inside of the cover cap (AK).
dadurch gekennzeichnet, daß die Rippenstärke annähernd dem Abstand zwischen dem Gehäusedeckel (GD) und der Abdeckkappe (AK) entspricht.9. Smoke detector according to one of the preceding claims,
characterized in that the rib thickness approximately corresponds to the distance between the housing cover (GD) and the cover cap (AK).
dadurch gekennzeichnet, daß die Größe der Löcher (LO) unterschiedlich, die Anzahl und die Anordnung der Löcher unsymmetrisch ist.10. Smoke detector according to one of the preceding claims,
characterized in that the size of the holes (LO) is different, the number and arrangement of the holes is asymmetrical.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3625910 | 1986-07-31 | ||
| DE3625910 | 1986-07-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0257325A1 true EP0257325A1 (en) | 1988-03-02 |
Family
ID=6306387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87110940A Withdrawn EP0257325A1 (en) | 1986-07-31 | 1987-07-28 | Smoke detector for early fire detection |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP0257325A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011042020A1 (en) * | 2009-10-05 | 2011-04-14 | Cavius Aps | Smoke alarm |
| WO2016186884A1 (en) | 2015-05-15 | 2016-11-24 | Google Inc. | Smoke detector chamber architecture and related methods |
| EP3671680A1 (en) * | 2018-12-18 | 2020-06-24 | Siemens Schweiz AG | Fire or smoke alarm |
| CN117156234A (en) * | 2023-06-30 | 2023-12-01 | 陕西浩悦博纳网络科技有限公司 | Fire control surveillance camera head with smog alarming function |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3916209A (en) * | 1973-07-24 | 1975-10-28 | Electro Signal Lab | Vaned baffle for optical smoke detector |
| US4121110A (en) * | 1976-11-04 | 1978-10-17 | Solomon Elias E | Optically biased smoke detector |
-
1987
- 1987-07-28 EP EP87110940A patent/EP0257325A1/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3916209A (en) * | 1973-07-24 | 1975-10-28 | Electro Signal Lab | Vaned baffle for optical smoke detector |
| US4121110A (en) * | 1976-11-04 | 1978-10-17 | Solomon Elias E | Optically biased smoke detector |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN, Band 2, Nr. 62 (E-78)[1910], 11. Mai 1978; & JP-A-53 27 085 (MATSUSHITA DENKO K.K.) 13-03-1978 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011042020A1 (en) * | 2009-10-05 | 2011-04-14 | Cavius Aps | Smoke alarm |
| US8933811B2 (en) | 2009-10-05 | 2015-01-13 | Cavius Aps | Smoke alarm |
| WO2016186884A1 (en) | 2015-05-15 | 2016-11-24 | Google Inc. | Smoke detector chamber architecture and related methods |
| EP3295439A4 (en) * | 2015-05-15 | 2019-01-23 | Google LLC | Smoke detector chamber architecture and related methods |
| CN110766906A (en) * | 2015-05-15 | 2020-02-07 | 谷歌有限责任公司 | Smoke detector chamber structure and related method |
| CN110766906B (en) * | 2015-05-15 | 2021-03-30 | 谷歌有限责任公司 | Smoke detector chamber structure and related method |
| EP3671680A1 (en) * | 2018-12-18 | 2020-06-24 | Siemens Schweiz AG | Fire or smoke alarm |
| WO2020126326A1 (en) * | 2018-12-18 | 2020-06-25 | Siemens Schweiz Ag | Fire- or smoke alarm |
| CN113168753A (en) * | 2018-12-18 | 2021-07-23 | 西门子瑞士有限公司 | Fire or smoke alarm |
| AT17840U1 (en) * | 2018-12-18 | 2023-04-15 | Siemens Schweiz Ag | Fire or smoke detector |
| US11869327B2 (en) | 2018-12-18 | 2024-01-09 | Siemens Schweiz Ag | Fire or smoke alarm |
| CN117156234A (en) * | 2023-06-30 | 2023-12-01 | 陕西浩悦博纳网络科技有限公司 | Fire control surveillance camera head with smog alarming function |
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Inventor name: BIBO, CLEMENS, DIPL.-PHYS. Inventor name: THILO, PEER, DR. ING. |