EP0499802B1 - Fumes evacuation device - Google Patents

Fumes evacuation device Download PDF

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Publication number
EP0499802B1
EP0499802B1 EP92100858A EP92100858A EP0499802B1 EP 0499802 B1 EP0499802 B1 EP 0499802B1 EP 92100858 A EP92100858 A EP 92100858A EP 92100858 A EP92100858 A EP 92100858A EP 0499802 B1 EP0499802 B1 EP 0499802B1
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EP
European Patent Office
Prior art keywords
sound
extraction device
vapour extraction
blower
pipe
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Expired - Lifetime
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EP92100858A
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German (de)
French (fr)
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EP0499802A2 (en
EP0499802A3 (en
Inventor
Kurt Dipl.-Ing. Deppert
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BSH Hausgeraete GmbH
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Individual
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Publication of EP0499802A3 publication Critical patent/EP0499802A3/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/02—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area

Definitions

  • the invention relates to an extractor device with a filter housing and optionally a fan arranged outside of this, the suction side via a pipe system, which serves to guide the air flow generated by the fan, fluidically connected to the outlet opening of the collecting housing, in a branching, closed Auxiliary duct of the pipe system is provided with sound-absorbing means for reducing the sound generated by the blower.
  • the blower causing the noise is no longer assigned to the housing of the extractor hood, but instead the source of the noise is located as far as possible from the location of the user in the piping system of the extractor device.
  • an extractor hood is known from DE-GM 78 18 812, in which the fan is arranged outside its collecting housing and is accommodated in a separate housing.
  • the collecting housing and the housing of the blower are fluidly connected to one another via a pipeline.
  • the housing of the blower is lined with soundproofing material and the propagation of the sound waves emitted by the blower is changed.
  • the grease filter arranged in the collecting housing the sucked-in air flow cannot be completely cleaned of grease particles, so that it cannot be avoided that the grease particles settle on the soundproofing material. Over time, the absorption effect of the soundproofing material is significantly impaired and eventually loses its effectiveness.
  • Another extractor device with a fan arranged outside its collecting housing is known from FR-A-26 24 580.
  • the sound-absorbing means are arranged in a branching, closed secondary duct of the pipe system and are essentially flush with the pipe wall of the pipe system having the secondary duct.
  • Such an arrangement of the sound-absorbing means is also exposed to the air flow sucked in by the blower, so that the fat particles entrained in the air flow can settle on the sound-absorbing means and thus lose their effectiveness over time.
  • the invention has for its object to dampen the sound emitted by the fan of an extractor device, especially in its direction of propagation, without impairing the flow conditions and without reducing the influence of foreign particles on the soundproofing material so that the sound does not reach the user if possible can spread out.
  • the sound-absorbing means are arranged outside the air flow generated by the fan in the secondary duct set back in the main direction of propagation of the sound.
  • the recessed arrangement of the soundproofing means in a secondary duct prevents contamination of the soundproofing means by grease particles which may be entrained in the air flow, so that permanent sound insulation is provided which also does not increase the flow resistance in the pipe system. Furthermore, blowers with higher performance can also be used without disturbing noise in order to increase the suction effect on the collecting housing.
  • Sound insulation is particularly effective if, according to a preferred embodiment of the invention, it is provided that the sound-absorbing means have a sound-absorbing part on a sound-reflecting part.
  • the sound-absorbing part is arranged closer to the suction side of the blower than the sound-reflecting part.
  • the main advantage of such a solution is that the material thickness of the sound-absorbing part can be reduced, since the sound waves still remaining after the first impact on the absorber are returned to the sound-absorbing part after their reflection on the sound-reflecting part.
  • Sound-absorbing means are particularly space-saving in terms of their construction and are easy to install if, according to a preferred embodiment of the invention, it is provided that the sound-absorbing part and the sound-reflecting part form a unit and are connected to one another.
  • the sound-absorbing part and the sound-reflecting part are successively arranged at a distance from one another.
  • Such a possible solution is characterized in that the materials for the sound-absorbing part and the sound-reflecting part can be coordinated independently of one another depending on the sound frequency to be damped.
  • the sound-absorbing part consists of an open-cell foam, the surface of which is digested and that the surface of the foam facing the blower is provided with nub-like approaches.
  • This embodiment shows the advantages that it has a particularly sound-absorbing effect and the accumulation of foreign particles is considerably more difficult due to the skin surface of the foam.
  • Sound waves are reflected particularly well when they strike the sound-reflecting part if, according to a preferred embodiment of the object of the invention, it is provided that it consists of sound-hard material.
  • the secondary duct is combined with a duct part which is produced in a mirror image perpendicular to its surface lines, represents a continuous piece of pipe which is fluidically connected to a pipe socket directed towards the collecting housing and forms an essentially T-shaped pipe element , with the mirror axis serving as the center line for the pipe socket.
  • a solution according to these features has the advantage that the tubular element is well suited and usable for both right and left connection.
  • the tubular element has a reflector for the sound waves on its section assigned to the blower, which essentially prevents its propagation to the collecting housing and which can deflect the sound waves towards the sound-absorbing means.
  • Such a solution is characterized in that a focusing effect for the sound waves towards the sound-absorbing means is achieved with simple constructional means.
  • a reflector is particularly expedient if, according to an advantageous embodiment of the object of the invention, it is provided that it is formed by a bend and is optionally arranged on one of the channel walls of the tubular element.
  • a fluidically favorable variant for the reflector results if, according to a preferred embodiment of the invention, it is provided that the bend serving as a reflector is provided with a radius at its apex.
  • a particularly high noise reduction in an extractor device is achieved if, according to a preferred embodiment of the invention, it is provided that an additional reflector is arranged in the area of the sound-absorbing means, which together with the reflector forms a deflection system for the sound waves emanating from the blower, which forms the This essentially prevents the housing from spreading and at the same time is able to deflect the sound waves towards the sound-absorbing means.
  • the branching off, closed secondary duct has a cranked piece which is able to absorb the sound-absorbing means.
  • T-shaped pipe element in the region of the confluent pipe socket to the secondary duct is equipped with air guiding devices which are able to largely prevent vortex formation at the confluence.
  • the pipe element is detachably connected to the pipe system.
  • the embodiment is not only characterized in that the pipe system is easily accessible for cleaning purposes after dismantling the pipe element, but also in that the pipe element itself is easy to clean and assemble.
  • the soundproofing means can be exchanged particularly easily if, according to a preferred embodiment of the object of the invention, it is provided that the soundproofing means are arranged in a closure piece, which forms the end of the secondary duct and is releasably connected to this, and is made of possibly soundproof material.
  • An extractor device designated by 10 in FIG. 1 has an umbrella-like collecting housing 11, optionally equipped with filter devices, whose outlet opening opposite the suction surface is connected by an intermediate piece 12 to a rectangular pipe system 13 composed of several sections.
  • the blower box 15 On the pressure side of the blower 14, the blower box 15 is adapted by reducing devices 16 to a wall box 18 built into an indicated masonry 17, which is provided on its side facing away from the blower box 15 with a blind-like grille 19.
  • a secondary duct 20 is arranged at the end of the pipe system 13, which is combined with a duct part 21 which is produced in a mirror image perpendicular to its surface lines, represents a continuous piece of pipe which is fluidically connected to a pipe socket 22 directed towards the collecting housing 11 and is essentially T -shaped tube element 23 forms, the mirror axis serving as the center line for the tube socket 22.
  • the T-shaped pipe element 23 is detachably connected to the rest of the pipe system 13 using fastening means, not shown.
  • the pipe socket 22 arranged on the pipe element 23 can also be arranged offset off-center to one of the longitudinal walls of the pipe element 23.
  • the end face of the T-shaped pipe element 23 facing away from the pipe system 13 is provided with a cap-like closure piece 24, which forms the closed secondary channel 20, and which is detachably fastened to the pipe element 23 with fastening means, also not shown. Its interior is equipped with sound-absorbing means 25, which lie outside the air flow generated by the blower 14 in the main direction of propagation characterized by the pipe system 13 for the sound emitted by the blower 14.
  • the sound-absorbing means 25 have a sound-absorbing part 26 and a sound-reflecting part 27, the distance between the sound-reflecting part 27 and the suction side of the blower 14 being greater than that of the sound-absorbing part 26 (as can also be seen in FIG. 2).
  • the sound-reflecting part 27 made of sound-hard material can also be formed by the closure piece 24, so that the additional part 27 can be saved.
  • the sound-absorbing part 26 forms a unit with the sound-reflecting part 27 and is connected to it, as is shown in detail in FIG. 1.
  • An adhesive connection has proven itself as a connection.
  • the open-cell foam serving as the sound-absorbing part 26 is nubby on its side facing the blower 14 Approaches 28 equipped, the surface of which is covered with a smooth, continuous skin 29 which closes the open cells of the foam, in order to make it difficult for any foreign particles to accumulate.
  • an open-cell polyurethane foam with a bulk density of approximately 20 kg / m 3 to 30 kg / m3 and a number of nubs of approx. 1100 nubs / m 2 was successfully tested.
  • the T-shaped tubular element 23 has on its section assigned to the blower 14 a reflector 30 for the sound waves, which essentially prevents its propagation to the collecting housing 11 and which points the sound waves to the sound-absorbing means 25 can distract.
  • An angle in a channel wall 31 of the tubular element 23 serves as the reflector 30, which can optionally be equipped with a radius in its apex 32 to reduce turbulence.
  • the angled serving as reflector 30 is arranged so that the channel widens towards the fan.
  • the transition from the apex 32 of the reflector to the pipe socket 22 is fluidically optimized in several straight sections in order to create a so-called "soft transition".
  • an additional reflector 33 is formed by a beveling of the secondary duct 20 directed towards the pipe socket 22, which together with the reflector 30 forms a deflection system for the sound waves emanating from the fan on the suction side forms. This essentially prevents the propagation of the sound waves towards the collecting housing 11 and at the same time deflects the sound waves towards the sound-absorbing means 25.
  • An angle of approximately 5 ° with respect to the horizontal has proven to be effective as the inclination for the additional reflector 33. It is also conceivable to insert the additional reflector 33 as an insert into the secondary duct 20.
  • the secondary duct 20 it would also be conceivable for it to have a cranked piece which is able to accommodate the sound-absorbing means 25.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pipe Accessories (AREA)
  • Exhaust Silencers (AREA)
  • Duct Arrangements (AREA)

Description

Die Erfindung betrifft eine Dunstabzugsvorrichtung mit ggf. Filtereinrichtungen aufweisenden Auffanggehäuse und einem außerhalb von diesem angeordneten Gebläse, das saugseitig über ein Rohrsystem, das zur Führung des vom Gebläse erzeugten Luftstromes dient, mit der Auslaßöffnung des Auffanggehäuses strömungstechnisch verbunden ist, wobei in einem abzweigenden, abgeschlossenen Nebenkanal des Rohrsystems schalldämmende Mitteln zur Reduzierung des vom Gebläse erzeugten Schalles vorgesehen sind.The invention relates to an extractor device with a filter housing and optionally a fan arranged outside of this, the suction side via a pipe system, which serves to guide the air flow generated by the fan, fluidically connected to the outlet opening of the collecting housing, in a branching, closed Auxiliary duct of the pipe system is provided with sound-absorbing means for reducing the sound generated by the blower.

Bei Dunstabzugsvorrichtungen ist man bestrebt, die von dessen Gebläse ausgehenden Schallwellen möglichst so abzuschirmen oder umzulenken, daß sich diese nicht auf die Benutzerseite fortpflanzen können.In extractor devices, efforts are made to shield or redirect the sound waves emanating from the blower in such a way that they cannot propagate to the user side.

Aus diesem Grund finden bereits unterschiedliche Schalldämpfereinrichtungen bei Dunstabzugseinrichtungen meist auf der Basis von Absorptions- oder Reflektionsdämpfern Anwendung.For this reason, different muffler devices are mostly used in extractor hoods based on absorption or reflection dampers.

Um den Geräuschpegel noch weiter zu senken, ist man dazu übergegangen, das das Geräusch verursachende Gebläse nicht mehr dem Gehäuse der Dunstabzugshaube zuzuordnen, sondern die Geräuschquelle je nach Möglichkeit möglichst weit vom Ort des Benutzers im Rohrleitungssystem der Dunstabzugsvorrichtung anzuordnen.In order to reduce the noise level even further, it has been adopted that the blower causing the noise is no longer assigned to the housing of the extractor hood, but instead the source of the noise is located as far as possible from the location of the user in the piping system of the extractor device.

So ist beispielsweise aus dem DE-GM 78 18 812 eine Dunstabzugshaube bekannt, bei der das Gebläse außerhalb ihres Auffanggehäuses angeordnet und in einem gesonderten Gehäuse untergebracht ist.For example, an extractor hood is known from DE-GM 78 18 812, in which the fan is arranged outside its collecting housing and is accommodated in a separate housing.

Das Auffanggehäuse und das Gehäuse des Gebläses sind dabei strömungstechnisch über eine Rohrleitung miteinander verbunden. Das Gehäuse des Gebläses ist bei dieser Anordnung mit Schallschutzmaterial ausgekleidet und die vom Gebläse abgestrahlten Schallwellen in ihrer Ausbreitung zu ändern. Hierdurch wird bereits eine gewisse Schalldämmung erreicht, jedoch hat eine solche Anordnung den Nachteil, daß das Schallschutzmaterial ständig dem vom Gebläse erzeugten Luftstrom ausgesetzt ist. Trotz des im Auffanggehäuse angeordneten Fettfilters läßt sich der angesaugte Luftstrom nicht restlos von Fettpartikeln reinigen, so daß es sich nicht vermeiden läßt, daß sich die Fettpartikel am Schallschutzmaterial absetzen. Im Laufe der Zeit wird dadurch die Absorptionswirkung des Schallschutzmaterials erheblich beeinträchtigt und verliert schließlich seine Wirkung. Ein weiterer Nachteil in dieser Anordnung besteht darin, daß der in Richtung der Rohrleitung abgegebene Schall nahezu ungedämpft über den Auffangschirm auf den Ort des Benutzers übertragen wird. Um diesem Umstand entgegenzutreten, wäre es erforderlich, die Rohrleitung ebenfalls mit Schallschutzmaterial auszukleiden. Eine derartige Maßnahme hätte aber eine wesentliche Erhöhung des Strömungswiderstandes zu Folge.The collecting housing and the housing of the blower are fluidly connected to one another via a pipeline. In this arrangement, the housing of the blower is lined with soundproofing material and the propagation of the sound waves emitted by the blower is changed. This already achieves a certain level of sound insulation, but such an arrangement has the disadvantage that the soundproofing material is constantly exposed to the air flow generated by the blower. Despite the grease filter arranged in the collecting housing, the sucked-in air flow cannot be completely cleaned of grease particles, so that it cannot be avoided that the grease particles settle on the soundproofing material. Over time, the absorption effect of the soundproofing material is significantly impaired and eventually loses its effectiveness. Another disadvantage of this arrangement is that the sound emitted in the direction of the pipeline is transmitted almost undamped to the location of the user via the collecting screen. To counteract this, it would be necessary to also line the pipeline with soundproofing material. However, such a measure would result in a substantial increase in flow resistance.

Eine weitere Dunstabzugsvorrichtung mit einem außerhalb ihres Auffanggehäuses angeordneten Gebläse ist aus der FR-A-26 24 580 bekannt. Bei diesem Stand der Technik sind die schalldämmenden Mittel in einem abzweigenden, abgeschlossenen Nebenkanal des Rohrsystems angeordnet und schließen im wesentlichen bündig mit der den Nebenkanal aufweisenden Rohrwandung des Rohrsystems ab. Auch eine derartige Anordnung der schalldämmenden Mittel ist dem vom Gebläse angesaugten Luftstrom ausgesetzt, so daß die im Luftstrom mitgeführten Fettpartikel, sich an den schalldämmenden Mitteln absetzen können und diese somit im Laufe der Zeit immer mehr an Wirkung verlieren.Another extractor device with a fan arranged outside its collecting housing is known from FR-A-26 24 580. In this prior art, the sound-absorbing means are arranged in a branching, closed secondary duct of the pipe system and are essentially flush with the pipe wall of the pipe system having the secondary duct. Such an arrangement of the sound-absorbing means is also exposed to the air flow sucked in by the blower, so that the fat particles entrained in the air flow can settle on the sound-absorbing means and thus lose their effectiveness over time.

Der Erfindung liegt die Aufgabe zugrunde, dem vom Gebläse einer Dunstabzugsvorrichtung abgegebenen Schall vor allem in seiner Ausbreitungsrichtung zu einem hin, ohne Beeinträchtigung der Strömungsverhältnisse und ohne dämpfungsmindernde Einflußnahme von Fremdpartikeln auf der das Schallschutzmaterial so zu dämpfen, daß der Schall sich möglichst nicht bis zum Benutzer hin ausbreiten kann.The invention has for its object to dampen the sound emitted by the fan of an extractor device, especially in its direction of propagation, without impairing the flow conditions and without reducing the influence of foreign particles on the soundproofing material so that the sound does not reach the user if possible can spread out.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß die schalldämmenden Mittel außerhalb des vom Gebläse erzeugten Luftstromes im Nebenkanal zurückversetzt in der Hauptausbreitungsrichtung des Schalles angeordnet sind.This object is achieved according to the invention in that the sound-absorbing means are arranged outside the air flow generated by the fan in the secondary duct set back in the main direction of propagation of the sound.

Durch die zurückversetzte Anordnung der schalldämmenden Mittel in einem Nebenkanal wird eine Verunreinigung der schalldämmenden Mittel durch möglicherweise im Luftstrom mitgeführte Fettpartikal vermieden, so daß ein dauerhafter Schallschutz bereitgestellt ist, der zudem den Strömungswiderstand im Rohrsystem nicht erhöht. Ferner werden auch Gebläse mit höherer Leistung ohne störendes Geräusch anwendbar, um die Saugwirkung am Auffanggehäuse zu steigern.The recessed arrangement of the soundproofing means in a secondary duct prevents contamination of the soundproofing means by grease particles which may be entrained in the air flow, so that permanent sound insulation is provided which also does not increase the flow resistance in the pipe system. Furthermore, blowers with higher performance can also be used without disturbing noise in order to increase the suction effect on the collecting housing.

Besonders effektiv ist ein Schallschutz, wenn nach einer bevorzugten Ausführungsform der Erfindung vorgesehen ist, daß die schalldämmenden Mittel einen schallabsorbierenden Teil an einen schallreflektierenden Teil aufweisen.Sound insulation is particularly effective if, according to a preferred embodiment of the invention, it is provided that the sound-absorbing means have a sound-absorbing part on a sound-reflecting part.

Nach einer weiteren vorteilhaften Ausgestaltung des Gegenstandes der Erfindung ist vorgesehen, daß der schallabsorbierende Teil näher an der Saugseite des Gebläses angeordnet ist als der schallreflektierende Teil.According to a further advantageous embodiment of the object of the invention, it is provided that the sound-absorbing part is arranged closer to the suction side of the blower than the sound-reflecting part.

Der wesentliche Vorteil einer solchen Lösung liegt darin, daß die Materialstärke des schallabsorbierenden Teils verringert werden kann, da die nach dem ersten Auftreffen auf dem Absorber noch verbleibenden Schallwellen nach ihrer Reflektion an dem schallreflektierenden Teil erneut dem schallabsorbierenden Teil zugeführt werden.The main advantage of such a solution is that the material thickness of the sound-absorbing part can be reduced, since the sound waves still remaining after the first impact on the absorber are returned to the sound-absorbing part after their reflection on the sound-reflecting part.

Besonders platzsparend in ihrem konstruktiven Aufbau und leicht zu installieren sind schalldämmende Mittel, wenn nach einer bevorzugten Ausführungsform der Erfindung vorgesehen ist, daß der schallabsorbierende Teil und der schallreflektierende Teil eine Einheit bilden und miteinander verbunden sind.Sound-absorbing means are particularly space-saving in terms of their construction and are easy to install if, according to a preferred embodiment of the invention, it is provided that the sound-absorbing part and the sound-reflecting part form a unit and are connected to one another.

Als zusätzliche vorteilhafte Ausgestaltung des Gegenstandes der Erfindung kann vorgesehen sein, daß der schallabsorbierende Teil und der schallreflektierende Teil nacheinander im Abstand zueinander angeordnet sind.As an additional advantageous embodiment of the object of the invention, it can be provided that the sound-absorbing part and the sound-reflecting part are successively arranged at a distance from one another.

Eine solche Lösungsmöglichkeit zeichnet sich dadurch aus, daß man die Werkstoffe für den schallabsorbierenden Teil und den schallreflektierenden Teil unabhängig voneinander je nach der zur dämmenden Schallfrequenz aufeinander abstimmen kann.Such a possible solution is characterized in that the materials for the sound-absorbing part and the sound-reflecting part can be coordinated independently of one another depending on the sound frequency to be damped.

Nach einer weiteren bevorzugten Ausführungsform des Gegenstandes der Erfindung ist vorgesehen, daß der schallabsorbierende Teil aus einem offenzelligen Schaum besteht, dessen Oberfläche verhautet ist und daß die dem Gebläse zugekehrte Oberfläche des Schaumes mit noppenartigen Ansätzen versehen ist.According to a further preferred embodiment of the subject matter of the invention, it is provided that the sound-absorbing part consists of an open-cell foam, the surface of which is digested and that the surface of the foam facing the blower is provided with nub-like approaches.

Diese Ausführungsform zeigt die Vorteile, daß sie besonders schallabsorbierend wirkt und aufgrund der verhauteten Oberfläche des Schaumstoffes die Anlagerung von Fremdpartikeln wesentlich erschwert ist.This embodiment shows the advantages that it has a particularly sound-absorbing effect and the accumulation of foreign particles is considerably more difficult due to the skin surface of the foam.

Besonders gut werden Schallwellen bei einem Auftreffen auf den schallreflektierenden Teil reflektiert, wenn nach einer bevorzugten Ausführungsform des Gegenstandes der Erfindung vorgesehen ist, daß dieser aus schallhartem Material besteht.Sound waves are reflected particularly well when they strike the sound-reflecting part if, according to a preferred embodiment of the object of the invention, it is provided that it consists of sound-hard material.

Entsprechend einer weiteren vorteilhaften Ausführungsform des Gegenstandes der Erfindung ist vorgesehen, daß der Nebenkanal mit einem spiegelbildlich senkrecht zu seinen Mantellinien erzeugten Kanalteil zusammengefaßt, ein durchgehendes Rohrstück darstellt, das mit einem zum Auffanggehäuse gerichteten Rohrstutzen strömungstechnisch verbunden ist und ein im wesentlichen T-förmiges Rohrelement bildet, wobei als Mittellinie für den Rohrstutzen die Spiegelachse dient.According to a further advantageous embodiment of the subject matter of the invention, it is provided that the secondary duct is combined with a duct part which is produced in a mirror image perpendicular to its surface lines, represents a continuous piece of pipe which is fluidically connected to a pipe socket directed towards the collecting housing and forms an essentially T-shaped pipe element , with the mirror axis serving as the center line for the pipe socket.

Ein Lösung gemäß diesen Merkmalen hat den Vorteil, daß das Rohrelement sowohl für Rechts- als auch für Linksanschluß gut geeignet und einsetzbar ist.A solution according to these features has the advantage that the tubular element is well suited and usable for both right and left connection.

Entsprechend einer weiteren bevorzugten Ausführungsform des Gegenstandes der Erfindung ist vorgesehen, daß das Rohrelement auf seinem dem Gebläse zugeordneten Abschnitt einen Reflektor für die Schallwellen aufweist, der dessen Ausbreitung zum Auffanggehäuse hin im wesentlichen verhindert und der die Schallwellen zu den schalldämmenden Mitteln hin abzulenken vermag.According to a further preferred embodiment of the subject matter of the invention, it is provided that the tubular element has a reflector for the sound waves on its section assigned to the blower, which essentially prevents its propagation to the collecting housing and which can deflect the sound waves towards the sound-absorbing means.

Eine solche Lösung zeichnet sich dadurch aus, daß bereits mit einfachen konstruktiven Mitteln ein Fokussiereffekt für die Schallwellen zu den schalldämmenden Mitteln hin erreicht wird.Such a solution is characterized in that a focusing effect for the sound waves towards the sound-absorbing means is achieved with simple constructional means.

Besonders zweckmäßig ist ein Reflektor, wenn nach einer vorteilhaften Ausgestaltung des Gegenstandes der Erfindung vorgesehen ist, daß dieser durch eine Abwinklung gebildet ist und wahlweise an einer der Kanalwände des Rohrelementes angeordnet ist.A reflector is particularly expedient if, according to an advantageous embodiment of the object of the invention, it is provided that it is formed by a bend and is optionally arranged on one of the channel walls of the tubular element.

Eine strömungstechnisch günstige Variante für den Reflektor ergibt sich, wenn nach einer bevorzugten Ausgestaltung der Erfindung vorgesehen ist, daß die als Reflektor dienende Abwinklung in ihrem Scheitel mit einem Radius versehen ist.A fluidically favorable variant for the reflector results if, according to a preferred embodiment of the invention, it is provided that the bend serving as a reflector is provided with a radius at its apex.

Eine besonders hohe Geräuschreduzierung bei einer Dunstabzugsvorrichtung wird erzielt, wenn nach einer bevorzugten Ausführung der Erfindung vorgesehen ist, daß im Bereich der schalldämmenden Mittel ein zusätzlicher Reflektor angeordnet ist, der zusammen mit dem Reflektor ein Ablenksystem für die vom Gebläse saugseitig ausgehenden Schallwellen bildet, das die Ausbreitung dieser zum Auffanggehäuse hin im wesentlichen verhindert und gleichzeitig die Schallwellen zu den schalldämmenden Mittel hin abzulenken vermag.A particularly high noise reduction in an extractor device is achieved if, according to a preferred embodiment of the invention, it is provided that an additional reflector is arranged in the area of the sound-absorbing means, which together with the reflector forms a deflection system for the sound waves emanating from the blower, which forms the This essentially prevents the housing from spreading and at the same time is able to deflect the sound waves towards the sound-absorbing means.

Nach einer nächsten vorteilhaften Ausgestaltung des Gegenstandes der Erfindung kann vorgesehen sein, daß der abzweigende, abgeschlossene Nebenkanal ein abgekröpftes Stück aufweist, das die schalldämmenden Mittel aufzunehmen vermag.According to a next advantageous embodiment of the subject matter of the invention, it can be provided that the branching off, closed secondary duct has a cranked piece which is able to absorb the sound-absorbing means.

Eine solche Lösung hat den Vorteil, daß auch bei sehr kurz ausgeführtem Nebenkanal die schalldämmenden Mittel ziemlich sicher gegen Verschmutzungen durch den Luftstrom sind.Such a solution has the advantage that even with a very short secondary duct, the soundproofing means are fairly safe against contamination by the air flow.

Eine Optimierung der Strömungsverhältnisse und damit verbunden eine zusätzliche Herabsetzung des Geräuschniveaus durch Vermeidung von Verwirbelungen wird erreicht, wenn nach einer weiteren vorteilhaften Ausführungform des Gegenstandes der Erfindung vorgesehen ist, daß das T-förmige Rohrelement im Bereich des einmündenden Rohrstutzens zum Nebenkanal hin mit Luftleitvorrichtungen ausgestattet ist, die eine Wirbelbildung an der Einmündung weitgehend zu verhindern vermögen.An optimization of the flow conditions and associated an additional reduction in the noise level by avoiding turbulence is achieved if, according to a further advantageous embodiment of the object of the invention, it is provided that the T-shaped pipe element in the region of the confluent pipe socket to the secondary duct is equipped with air guiding devices which are able to largely prevent vortex formation at the confluence.

Bei einer nächsten bevorzugten Ausführungsform des Gegenstandes der Erfindung ist vorgesehen, daß das Rohrelement mit dem Rohrsystem lösbar verbunden ist.In a next preferred embodiment of the object of the invention it is provided that the pipe element is detachably connected to the pipe system.

Die Ausführungsform zeichnet sich nicht nur dadurch aus, daß das Rohrsystem nach der Demontage des Rohrelements zu Reinigungszwecken leicht zugänglich ist, sondern auch dadurch, daß das Rohrelement selbst leicht zu reinigen und zu montieren ist.The embodiment is not only characterized in that the pipe system is easily accessible for cleaning purposes after dismantling the pipe element, but also in that the pipe element itself is easy to clean and assemble.

Besonders leicht auswechseln lassen sich die schalldämmenden Mittel, wenn nach einer bevorzugten Ausführungsform des Gegenstandes der Erfindung vorgesehen ist, daß die schalldämmenden Mittel in einem den Abschluß des Nebenkanals bildenden und mit diesem lösbar verbundenen Verschlußstück aus ggf. schallhartem Material angeordnet sind.The soundproofing means can be exchanged particularly easily if, according to a preferred embodiment of the object of the invention, it is provided that the soundproofing means are arranged in a closure piece, which forms the end of the secondary duct and is releasably connected to this, and is made of possibly soundproof material.

Die Erfindung ist in der nachfolgenden Beschreibung anhand eines in der beigefügten Zeichnung vereinfacht dargestellten Ausführungsbeispieles erläutert. Es zeigen:

Fig. 1
eine Dunstabzugsvorrichtung, dessen ein Gebläse aufweisendes Rohrsystem an einen Mauerkasten angeschlossen ist und auf dessen gegenüberliegender Seite angeordnete, in einem Durchbruch des Rohrsystems teilweise sichtbare schalldämmende Mittel liegen, in raumbildlicher Darstellung,
Fig. 2
das Rohrelement mit seitlich von dessen Nebenkanal abgezogenen, die schalldämmenden Mittel aufnehmenden Verschlußstück in raumbildlicher Darstellung und
Fig. 3
ein Rohrelement ähnlich dem in Fig. 2 mit einem gebläseseitig angeordneten Reflektor und einem vor den schalldämmenden Mitteln, in dem mit einer Verschlußkappe verschlossenen Nebenkanal angeordneten zusätzlichen Reflektor mit vorgeschalteten, zum Gebläse hin orientierten Luftleitvorrichtungen in Schnittdarstellung.
The invention is explained in the following description with reference to an embodiment shown in simplified form in the accompanying drawing. Show it:
Fig. 1
a fume extraction device, the pipe system of which has a blower is connected to a wall box and on the opposite side of which there are sound-absorbing means which are partially visible in an opening in the pipe system, in a spatial representation,
Fig. 2
the tubular element with the side of its secondary channel, the sound-absorbing means receiving closure piece in a spatial representation and
Fig. 3
a tubular element similar to that in FIG. 2 with a reflector arranged on the blower side and an additional reflector arranged in front of the sound-absorbing means, in the secondary duct closed with a sealing cap, with upstream air guiding devices oriented towards the blower in a sectional view.

Eine in Fig. 1 mit 10 bezeichnete Dunstabzugsvorrichtung weist ein ggf. mit Filtereinrichtungen ausgestattetes schirmartiges Auffanggehäuse 11 auf, dessen der Ansaugfläche gegenüberliegende Auslaßöffnung durch ein Zwischenstück 12 an einem aus mehreren Abschnitten zusammengesetztes rechteckförmiges Rohrsystem 13 angeschlossen ist. Zur Aufnahme eines außerhalb des Auffanggehäues 11 angeordneten Gebläses 14 (gestrichelt angedeutet) dient ein Gebläsekasten 15, der in das Rohrsystem 13 strömungstechnisch integriert ist. Auf der Druckseite des Gebläses 14 ist der Gebläsekasten 15 durch Reduziereinrichtungen 16 an einen in ein angedeutetes Mauerwerk 17 eingebauten Mauerkasten 18 angepaßt, der auf seiner dem Gebläsekasten 15 abgewandten Seite mit einem jalousieartigen Gitter 19 versehen ist.An extractor device designated by 10 in FIG. 1 has an umbrella-like collecting housing 11, optionally equipped with filter devices, whose outlet opening opposite the suction surface is connected by an intermediate piece 12 to a rectangular pipe system 13 composed of several sections. A blower box 15, which is fluidically integrated in the pipe system 13, serves to receive a blower 14 (indicated by dashed lines) arranged outside the collecting housing 11. On the pressure side of the blower 14, the blower box 15 is adapted by reducing devices 16 to a wall box 18 built into an indicated masonry 17, which is provided on its side facing away from the blower box 15 with a blind-like grille 19.

Dem Mauerkasten 18 gegenüberliegend ist am Ende des Rohrsystems 13 ein Nebenkanal 20 angeordnet, der mit einem spiegelbildlich senkrecht zu seinem Mantellinien erzeugten Kanalteil 21 zusammengefaßt, ein durchgehendes Rohrstück darstellt, das mit einem zum Auffanggehäuse 11 gerichteten Rohrstutzen 22 strömungstechnisch verbunden ist und ein im wesentlichen T-förmiges Rohrelement 23 bildet, wobei als Mittellinie für den Rohrstutzen 22 die Spiegelachse dient. Das T-förmige Rohrelement 23 ist mit nicht dargestellten Befestigungsmitteln mit dem restlichen Rohrsystem 13 lösbar verbunden. Der am Rohrelement 23 angeordnete Rohrstutzen 22 kann auch außermittig zu einer der Längswände des Rohrelements 23 hin versetzt angeordnet sein.Opposite the wall box 18, a secondary duct 20 is arranged at the end of the pipe system 13, which is combined with a duct part 21 which is produced in a mirror image perpendicular to its surface lines, represents a continuous piece of pipe which is fluidically connected to a pipe socket 22 directed towards the collecting housing 11 and is essentially T -shaped tube element 23 forms, the mirror axis serving as the center line for the tube socket 22. The T-shaped pipe element 23 is detachably connected to the rest of the pipe system 13 using fastening means, not shown. The pipe socket 22 arranged on the pipe element 23 can also be arranged offset off-center to one of the longitudinal walls of the pipe element 23.

Die vom Rohrsystem 13 abgewandte Stirnseite des T-förmigen Rohrelementes 23 ist mit einem, den abgeschlossenen Nebenkanal 20 bildenden kappenartigen Verschlußstück 24 versehen, das mit ebenso nicht dargestellten Befestigungsmitteln lösbar am Rohrelement 23 befestigt ist. Dessen Innenraum ist mit schalldämmenden Mitteln 25 ausgestattet , die außerhalb des vom Gebläse 14 erzeugten Luftstromes in der vom Rohrsystem 13 geprägten Hauptausbreitungsrichtung für den vom Gebläse 14 saugseitig abgegebenen Schall liegen.The end face of the T-shaped pipe element 23 facing away from the pipe system 13 is provided with a cap-like closure piece 24, which forms the closed secondary channel 20, and which is detachably fastened to the pipe element 23 with fastening means, also not shown. Its interior is equipped with sound-absorbing means 25, which lie outside the air flow generated by the blower 14 in the main direction of propagation characterized by the pipe system 13 for the sound emitted by the blower 14.

Die schalldämmenden Mittel 25 weisen einen schallabsorbierenden Teil 26 und einen schallreflektierenden Teil 27 auf, wobei der Abstand des schallreflektierenden Teiles 27 zur Saugseite des Gebläses 14 größer ist als der des schallabsorbierenden Teiles 26 (wie auch aus Fig. 2 ersichtlich ist).The sound-absorbing means 25 have a sound-absorbing part 26 and a sound-reflecting part 27, the distance between the sound-reflecting part 27 and the suction side of the blower 14 being greater than that of the sound-absorbing part 26 (as can also be seen in FIG. 2).

Der aus schallhartem Material bestehende schallreflektierende Teil 27 kann auch durch das Verschlußstück 24 gebildet sein, so daß das zusätzliche Teil 27 eingespart werden kann.The sound-reflecting part 27 made of sound-hard material can also be formed by the closure piece 24, so that the additional part 27 can be saved.

Im eingebauten Zustand bildet der schallabsorbierende Teil 26 mit dem schallreflektierenden Teil 27 eine Einheit und ist mit diesem verbunden, wie ausschnittsweise aus Fig. 1 ersichtlich ist. Als Verbindung hat sich unter anderem eine Klebeverbindung bewährt. Alternativ ist es jedoch auch denkbar, den schallabsorbierenden Teil 26 im Abstand zum schallreflektierenden Teil 27 anzuordnen, um dadurch hinsichtlich der Schalleindämmung mehr Variationsmöglichkeiten zur Verfügung zu haben.In the installed state, the sound-absorbing part 26 forms a unit with the sound-reflecting part 27 and is connected to it, as is shown in detail in FIG. 1. An adhesive connection has proven itself as a connection. Alternatively, however, it is also conceivable to arrange the sound-absorbing part 26 at a distance from the sound-reflecting part 27, in order thereby to have more possible variations with regard to sound insulation.

Wie insbesondere aus Fig. 2 hervorgeht, ist der als schallabsorbierende Teil 26 dienende offenzellige Schaumstoff an seiner dem Gebläse 14 zugewandten Seite mit noppenartigen Ansätzen 28 ausgestattet, dessen Oberfläche mit einer glatten, durchgehenden, die offenen Zellen des Schaumes verschließenden Haut 29 überzogen ist, um eine evtl. Anlagerung von Fremdpartikeln zu erschweren. Erfolgreich erprobt wurde in diesem Zusammenhang ein offenzelliger Polyurethanschaum mit einer Rohdichte von ungefähr 20 kg/m3 bis 30 kg/m3 und einer Noppenzahl von ca. 1100 Noppen/m2.As can be seen in particular from FIG. 2, the open-cell foam serving as the sound-absorbing part 26 is nubby on its side facing the blower 14 Approaches 28 equipped, the surface of which is covered with a smooth, continuous skin 29 which closes the open cells of the foam, in order to make it difficult for any foreign particles to accumulate. In this context, an open-cell polyurethane foam with a bulk density of approximately 20 kg / m 3 to 30 kg / m3 and a number of nubs of approx. 1100 nubs / m 2 was successfully tested.

Wie insbesondere aus Fig. 3 hervorgeht, weist das T-förmige Rohrelement 23 auf seinem dem Gebläse 14 zugeordneten Abschnitt einen Reflektor 30 für die Schallwellen auf, der dessen Ausbreitung zum Auffanggehäuse 11 hin im wesentlichen verhindert und der die Schallwellen zu den schalldämmenden Mittel 25 hin abzulenken vermag. Als Reflektor 30 dient dabei eine Abwinklung in einer Kanalwand 31 des Rohrelementes 23, die wahlweise in ihrem Scheitel 32 mit einem Radius zur Verminderung von Verwirbelungen ausgestattet sein kann. Die als Reflektor 30 dienende Abwinklung ist so angeordnet, daß sich der Kanal zum Gebläse hin erweitert. Der Übergang vom Scheitel 32 des Reflektors bis zum Rohrstutzen 22 verläuft in mehreren geraden Abschnitten strömungstechnisch optimiert, um einen sogenannten "weichen Übergang" zu schaffen. Aus Versuchen hat sich gezeigt, daß neben brauchbaren Reflektions- auch gute Diffusorwirkungen erzielt werden, wenn der Reflektor 30 gegenüber der Horizontalen einen Winkel von in etwa 8° einschließt. Ferner hat sich bei Erprobung herausgestellt, daß bereits gute Reflektoreigenschaften erzielt werden, wenn für das Rohrsystem 13, aber insbesondere für das T-förmige Rohrelement 23 schallharte Materialien, z.B. auf Polypropylenbasis (PP1210-014, PPN oder VP7190) angewendet werden.As can be seen in particular from FIG. 3, the T-shaped tubular element 23 has on its section assigned to the blower 14 a reflector 30 for the sound waves, which essentially prevents its propagation to the collecting housing 11 and which points the sound waves to the sound-absorbing means 25 can distract. An angle in a channel wall 31 of the tubular element 23 serves as the reflector 30, which can optionally be equipped with a radius in its apex 32 to reduce turbulence. The angled serving as reflector 30 is arranged so that the channel widens towards the fan. The transition from the apex 32 of the reflector to the pipe socket 22 is fluidically optimized in several straight sections in order to create a so-called "soft transition". Experiments have shown that, in addition to useful reflection effects, good diffuser effects are achieved if the reflector 30 forms an angle of approximately 8 ° with respect to the horizontal. Furthermore, it has been found in testing that good reflector properties can already be achieved if, for the pipe system 13, but in particular for the T-shaped pipe element 23, reverberant materials, e.g. based on polypropylene (PP1210-014, PPN or VP7190).

Als Alternative zu der als Reflektor 30 in einer der Kanalwände 31 eingebrachten Abwinklung wären auch entsprechend abgewinkelte, in den Kanal des Rohrelementes 23 einbringbare Elemente aus schallhartem Material denkbar.As an alternative to the bend introduced as a reflector 30 in one of the channel walls 31, correspondingly angled elements made of sound-resistant material that can be introduced into the channel of the tubular element 23 would also be conceivable.

Gegenüber dem Reflektor 30 ist an die Einmündung des Rohrstutzens 22 angrenzend, im Bereich der schalldämmenden Mittel 25 ein zusätzlicher Reflektor 33 durch eine zum Rohrstutzen 22 gerichtete Anschrägung des Nebenkanals 20 gebildet, der zusammen mit dem Reflektor 30 ein Ablenksystem für die vom Gebläse saugseitig ausgehenden Schallwellen bildet. Dadurch wird die Ausbreitung der Schallwellen zum Auffanggehäuse 11 hin im wesentlichen verhindert und gleichzeitig die Schallwellen zu den schalldämmenden Mittel 25 hin abgelenkt. Als Neigung für den zusätzlichen Reflektor 33 hat sich ein Winkel gegenüber der Horizontalen von ungefähr 5° als wirksam erwiesen. Es ist auch vorstellbar, den zusätzlichen Reflektor 33 als Einlegeteil in den Nebenkanal 20 einzubringen.Opposite the reflector 30, adjacent to the mouth of the pipe socket 22, in the area of the sound-absorbing means 25, an additional reflector 33 is formed by a beveling of the secondary duct 20 directed towards the pipe socket 22, which together with the reflector 30 forms a deflection system for the sound waves emanating from the fan on the suction side forms. This essentially prevents the propagation of the sound waves towards the collecting housing 11 and at the same time deflects the sound waves towards the sound-absorbing means 25. An angle of approximately 5 ° with respect to the horizontal has proven to be effective as the inclination for the additional reflector 33. It is also conceivable to insert the additional reflector 33 as an insert into the secondary duct 20.

Über dem zusätzlichen Reflektor 33 im Bereich des einmündenden Rohrstutzens 22, unmittelbar vor dem Nebenkanal 20, sind annähernd waagerechte Luftleitvorrichtungen 34 angeordnet, die eine Wirbelbildung beim Einströmen der vom Gebläse 14 angesaugten Luft an der Einmündung weitgehend zu verhindern vermögen.Above the additional reflector 33 in the area of the opening pipe socket 22, directly in front of the secondary duct 20, approximately horizontal air guiding devices 34 are arranged, which are largely able to prevent eddy formation when the air sucked in by the fan 14 flows in at the junction.

Als weitere Ausführung des Nebenkanals 20 wäre auch denkbar, daß dieser ein abgekröpftes Stück aufweist, das die schalldämmenden Mittel 25 aufzunehmen vermag.As a further embodiment of the secondary duct 20, it would also be conceivable for it to have a cranked piece which is able to accommodate the sound-absorbing means 25.

Claims (16)

  1. Vapour extraction device (10) with a collector housing (11), which in a given case comprises filter equipments, and a blower (14), which is arranged externally thereof and connected at the suction side in terms of flow technology with the outlet opening of the housing (11) by way of a pipe system (13), which serves to guide the air current produced by the blower (14), wherein sound-damping means (25) for the reduction of the sound produced by the blower (14) are provided in a branching-off and closed-off side channel (20) of the pipe system (13), characterised thereby, that the sound-damping means (25) are arranged set back in the main direction of propagation of the sound and in the side channel (20) outside the air flow produced by the blower (14).
  2. Vapour extraction device according to claim 1, characterised thereby, that the sound-damping means (25) comprise a sound-absorbing part (26) and a sound-reflecting part (27).
  3. Vapour extraction device according to claim 2, characterised thereby, that the sound-absorbing part (26) is arranged nearer to the suction side of the blower (14) than the sound-reflecting part (27).
  4. Vapour extraction device according to one of the claims 2 and 3, characterised thereby, that the sound-absorbing part (26) and the sound-reflecting part (27) form a unit and are connected one with the other.
  5. Vapour extraction device according to one of the claims 2 and 3, characterised thereby, that the sound-absorbing part (26) and the sound-reflecting part (27) are arranged at a spacing one from the other.
  6. Vapour extraction device according to one of the claims 2 to 5, characterised thereby, that the sound-absorbing part (26) is formed of an open-cell foam, the surface of which is a skin, and that side of the foam, which faces the blower (14), is equipped with burl-like projections (28).
  7. Vapour extraction device according to one of the claims 2 to 5, characterised thereby, that the sound-reflecting part (27) is formed of non-absorbing material.
  8. Vapour extraction device according to one of the claims 1 to 7, characterised thereby, that the side channel (20) combined with a channel part (21), which is produced in mirror image perpendicularly to its envelope lines, represents a continuous pipe member which is connected in terms of flow technology with a pipe nipple (22) directed towards the collector housing (11) and forms a substantially T-shaped pipe element (23), wherein the mirror axis serves as centre line for the pipe nipple (22).
  9. Vapour extraction device according to claim 8, characterised thereby, that the T-shaped pipe element (23) on its portion associated with the blower (14) displays a reflector (30) for the sound waves, which substantially prevents their propagation to the collector housing (11) and is capable of deflecting the sound waves towards the sound-damping means (25).
  10. Vapour extraction device according to claim 9, characterised thereby, that the reflector (30) is formed by a bent-over portion and arranged selectably at one of the channel walls (31) of the pipe member.
  11. Vapour extraction device according to one of the claims 9 and 10, characterised thereby, that the bent-over portion serving as reflector (30) is provided with a radius in its crest (32).
  12. Vapour extraction device according to one of the claims 9 to 11, characterised thereby, that an additional reflector (33) is arranged in the region of the sound-damping means (25) and together with the reflector (30) forms a deflecting system for the sound waves emanating from the blower (14) at the suction side, which system substantially prevents their propagation to the collector housing (11) and at the same time is capable of deflecting the sound waves towards the sound-damping means (25).
  13. Vapour extraction device according to one of the claims 1 to 12, characterised thereby, that the branching-off and closed-off side channel (20) displays a bent-over portion which is capable of receiving the sound-damping means (25).
  14. Vapour extraction device according to one of the claims 8 to 13, characterised thereby, that the T-shaped pipe element (23) is equipped in the region of the pipe nipple (22) opening into it with air guide devices (34) towards the side channel (20), which are capable of preventing an eddy formation at the entry to a large extent.
  15. Vapour extraction device according to one of the claims 8 to 14, characterised thereby, that the pipe element (23) is detachably connected with the pipe system (13).
  16. Vapour extraction device according to one of the claims 1 to 15, characterised thereby, that the sound-damping means (25) are arranged in a closure member (24), which forms the termination of the side channel (20) and is detachably connected therewith and which in a given case is of non-absorbing material.
EP92100858A 1991-02-18 1992-01-20 Fumes evacuation device Expired - Lifetime EP0499802B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4104963A DE4104963C1 (en) 1991-02-18 1991-02-18
DE4104963 1991-02-18

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EP0499802A2 EP0499802A2 (en) 1992-08-26
EP0499802A3 EP0499802A3 (en) 1993-03-31
EP0499802B1 true EP0499802B1 (en) 1997-10-01

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EP92100858A Expired - Lifetime EP0499802B1 (en) 1991-02-18 1992-01-20 Fumes evacuation device

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Publication number Priority date Publication date Assignee Title
DE4326837A1 (en) * 1993-08-10 1995-02-16 Paul Schacht Suction device
FR2720616B1 (en) * 1994-06-02 1996-12-27 Gouffault Sa Atelier Devotional candle fume extraction device.
CN100335847C (en) * 2004-02-12 2007-09-05 熊鸿斌 Oil smoke exhausting and ventilating composite noise eliminator
US7431127B2 (en) * 2004-09-21 2008-10-07 Durr Systems, Inc. Compact noise silencer for an air blower
DE102005014222B3 (en) * 2005-03-30 2006-08-31 Robert Bosch Gmbh Heating device for combusting a fuel-air mixture comprises an air outlet to a fan formed by a support arranged at right angles to the main axis of a suction tube and an air inlet formed by one or more openings of the suction tube
CN102466255B (en) * 2010-10-29 2015-09-30 博西华电器（江苏）有限公司 A kind of range hood and air inlet ring thereof
CN102901131A (en) * 2011-07-30 2013-01-30 丁德厚 General movement for split-type household electric range hood
CN102974586A (en) * 2011-09-02 2013-03-20 田菱精细化工（昆山）有限公司 Collecting fan housing for three-roller machine
DE102013100271A1 (en) * 2013-01-11 2014-07-17 Miele & Cie. Kg Hood
CN109959036A (en) * 2017-12-14 2019-07-02 博西华电器（江苏）有限公司 Air cleaning control method, device and kitchen ventilator for kitchen ventilator

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Publication number Priority date Publication date Assignee Title
DE7818812U1 (en) * 1978-06-23 1978-11-16 Gutmann, Rudolf, 7130 Muehlacker Cooker hood
IT8423921V0 (en) * 1984-11-29 1984-11-29 Rainox Spa PERFECTED HOOD FOR MODULAR KITCHENS, PROVIDED, AROUND A LARGE COMPARTMENT OF THE MOTOR-FAN GROUP, OF A LARGE PERIPHERAL AREA WITH A SURFACE COVERED IN MATERIAL PARTICULARLY SUITABLE FOR ENSURING AN EXCELLENT SOUND ABSORPTION.
FR2624580B1 (en) * 1987-12-10 1990-02-09 Aldes CONNECTION BOX BETWEEN HORIZONTAL AND VERTICAL DUCTS OF A MECHANICAL VENTILATION SYSTEM OF A BUILDING, EQUIPPED WITH ACOUSTIC ABSORPTION MEANS

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DE4104963C1 (en) 1992-06-25
DE59208932D1 (en) 1997-11-06
EP0499802A2 (en) 1992-08-26
EP0499802A3 (en) 1993-03-31

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