Abstract:
Installation de nettoyage des gaz d'échappement d'un moteur Diesel (1) d'un groupe électrogène à l'aide d'un filtre à particules (2), montée dans la conduite des gaz d'échappement du moteur caractérisée par un filtre à particules (2) sous-dimensionné par rapport au débit nominal des fumées du moteur Diesel (1) ; une dérivation commandée (5), contournant le filtre (2) ; et un circuit de commande ayant un détecteur dé fonctionnement du moteur Diesel fournissant un signal représentant un paramètre du moteur Diesel et générant le signal de commande (52, 53) à partir de ce paramètre pour commander la fermeture de la dérivation et ne l'ouvrir que lorsque le paramètre du moteur a atteint un niveau donné.
Abstract:
Ein Abgasschalldämpfer für Kraftfahrzeuge, umfassend ein Gehäuse (1), welches mindestens eine an den Abgasstrom (A) angekoppelte Funktionskammer (7) umschliesst, sowie einen zu- und einen abströmseitigen Anschlussstutzen (16; 18), weist folgende Merkmale auf: - Der zuströmseitige und der abströmseitige Anschlussstutzen (16; 18) sind durch die Enden eines einstückigen, den Schalldämpfer durchgehen durchsetzenden Rohres (4, 4', 4") gebildet, welches zumindest auf einem Teil seiner Länge von mindestens einer Funktionskammer (7) vollständig umgeben und über eine Perforation an diese angekoppelt ist; - die Perforation umfasst mindestens einen von einer ggfs. Zusätzlich vorgesehenen üblichen Lochung (9) abgesetzten Perforationsring (10) mit einer umlaufenden Abfolge von Durchbrüchen (11), die in einer auf der Achse (12) des Rohres (4) senkrecht stehenden Ebene (13) angeordnet sind, und einer umlaufenden, als Aufweitung (14) oder Einschnürung ausgeführten Querschnittsänderung (15).
Abstract:
A method for forming odd-shaped mufflers is achieved by first introducing an unfilled muffler insert (52) having a desired number of pipes (18) and partitions (14a-c) within a two-piece shaped tool (50). Fibrous material (24) is introduced within desired compartments (16a-d) formed between the shaped tool and unfilled insert to form a filled insert (70). The shaped tool and filled insert are then placed on a winding device (100). A yarn thread (26) is then wound and secured around the fibrous material within a gap (175) created between the two pieces of the shaped tool. The winding device and shaped tool are then removed from the filled and wound muffler insert (71). The wound and filled muffler insert may then either be pressed into a previously formed muffler shell (12), or alternatively, the muffler shell may be formed around the wound and filled muffler insert to form the muffler (15).
Abstract:
Disclosed is silencer for a pneumatic device, which introduces compression air from the pneumatic device, reduces noise from the introduced compression air by using a sound absorption member installed within a cabinet, and exhausts the noise-reduced compression air, the silencer being characterized in that at least one support plate is installed within the cabinet to prevent the movement of the movement of the absorption member when the compression air is introduced from the pneumatic device to the cabinet.
Abstract:
Die Erfindung betrifft einen schallisolierenden Hitzeschutzschild (3), insbesondere für Kraftfahrzeuge, der einen aus Aluminium hergestellten Träger (4), eine Schallabsorptionsschicht (6) und eine aus Aluminium hergestellte Wärmeabschirmung (7) aufweist. Um ein einfaches Recycling zu ermöglichen sowie eine hohe Wärmeabschirmwirkung als auch ein hohes Schallabsorptionsvermogen zu erzielen, wird vorgeschlagen, als Schallabsorptionsschicht (6) eine durchlässige Matte aus Aluminiumgewirke zu verwenden, wobei das Aluminiumgewirke mehrlagig übereinander gelegt und zu der durchlässigen Matte verpresst ist. Der erfindungsgemässe Hitzeschutz schild (3) stellt somit ein Einstoffprodukt dar. Der Träger (4) besteht vorzugsweise aus einem mikroperforierten Aluminiumblech, während die Wärmeabschirmung (7) vorzugsweise aus Aluminiumfolie hergestellt ist.
Abstract:
The use of fiber metal or similarly high flow resistance and high acoustic transparency material as a liner for traditional acoustically absorptive media in a dissipative muffler exhibits improved low frequency sound attenuation, reduces back pressure, and eliminates media entrainment or "blow-out" phenomenon which results in longer muffler life. The same class of materials may also be used to fashion an element that provides linear occlusion inside an otherwise line-of-sight of muffler, where the occluding element provides improved impedance-matching acoustivc absorption. Disclosed embodiments providing linear occlusion minimize traditional increases in muffler backpressure by incorporating helical, conical, and annular members in mufflers with round ducts. To maximize attenuation, a muffler according to the invention may feature both a fiber metal fill liner and a fiber linear occlusion element. Further, the liner that connects the inlet (1) and outlet (2) ports of the muffler may feature an offset, elbow, or turn that would simultaneously allow it to provide means for linear occlusion.
Abstract:
An arrangement for providing a noise silencing unit (3) for reducing noise from a gas through flow, which comprises at least a first flow path for said gas flow and a detection arrangement in connection with said first flow path for detecting the pressure of the gas flow. Further the arrangement comprises a switching arrangement with an adjustable throttle for blocking the first flow path to a first opening degree at detecting a pressure which is below a predetermined first limit value (p0), whereby the throttle is arranged for opening to a second opening degree if the first limit value (p0) is exceeded, and the throttle is arranged for opening to a third opening degree at detecting a pressure exceeding a predetermined second limit value (p1). The first opening degree corresponds to less than about 15% of the complete sectional area of the first flow path at the throttle, and that the second opening degree corresponds to more than about 30% and less than about 60% of the complete sectional area, and the third opening degree corresponds to more than about 90% of the complete sectional area.
Abstract:
The device comprises an exhaust gas duct (8) for guiding the exhaust gas (A), an injection device (10) for injecting a reactant (R) into the exhaust gas (A) and at least one built-in catalyst (16, 18) mounted in the exhaust gas duct (8). According to the invention, in order to reduce the emissions of sound while enabling the production of a device having a compact structure, the injection chamber (4) and the downstream mixture chamber (6) for mixing the injected reactant (R) with the exhaust gas (A) are embodied in the form of a silencer.
Abstract:
A muffler (1) is described for muffling both positive power and compression brake type engine retarders. The muffler includes an outer shell (3) defining an internal volume (45). A first, inner, perforated wall (57) is spaced from the outer shell and defines a first, annular, volume (55) therebetween. A first volume of packing material (59) is positioned within the annular volume. An inlet tube (6) is oriented within the internal volume. In certain embodiments, the inner perforated wall circumscribes at least a portion of the inlet tube, and extends a distance of at least 25 % of the axial length of the outer wall. Both single and dual muffler systems are described. Methods of use and operation are also provided.
Abstract:
A silencer (10) includes a polymeric casing (12) spaced from at least one inlet pipe and at least one outlet pipe by polymeric spacers (52). The polymeric spacers are made from a different material to that of the polymeric casing. The polymeric spacers are heat-resistant and have a higher melting point than the polymeric casing. The polymeric spacers are made of a softer material than the polymeric casing, and the polymeric spacers are capable of being deformed to accommodate irregularities in the shape of the inlet and outlet pipes.