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1. WO1991000958 - IN-LINE NOISE ATTENUATION DEVICE FOR A GAS CONDUIT

Publication Number WO/1991/000958
Publication Date 24.01.1991
International Application No. PCT/EP1990/001074
International Filing Date 04.07.1990
Chapter 2 Demand Filed 05.02.1991
IPC
F01N 1/06 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
1Silencing apparatus characterised by method of silencing
06by using interference effect
F01N 1/08 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
1Silencing apparatus characterised by method of silencing
08by reducing exhaust energy by throttling or whirling
F01N 13/16 2010.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
13Exhaust or silencing apparatus characterised by constructional features
16Selection of particular materials
F02M 35/12 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
35Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
12Intake silencers
CPC
F01N 1/08
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
1Silencing apparatus characterised by method of silencing
08by reducing exhaust energy by throttling or whirling
F01N 13/16
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
13Exhaust or silencing apparatus characterised by constructional features ; ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
16Selection of particular materials
F01N 2470/30
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
2470Structure or shape of gas passages, pipes or tubes
30Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow
F02M 35/10118
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
35Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
10Air intakes; Induction systems
10091characterised by details of intake ducts: shapes; connections; arrangements
10118with variable cross-sections of intake ducts along their length; Venturis; Diffusers
F02M 35/1211
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
35Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
12Intake silencers ; Sound modulation, transmission or amplification
1205Flow throttling or guiding
1211by using inserts in the air intake flow path, e.g. baffles, throttles or orifices; Flow guides
F02M 35/1216
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
35Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
12Intake silencers ; Sound modulation, transmission or amplification
1205Flow throttling or guiding
1216by using a plurality of holes, slits, protrusions, perforations, ribs or the like; Surface structures; Turbulence generators
Applicants
  • SIEMENS AKTIENGESELLSCHAFT [DE/DE]; Wittelsbacherplatz 2 D-80333 München, DE
Inventors
  • LEE, Carlos; CA
Common Representative
  • SIEMENS AKTIENGESELLSCHAFT; Postfach 22 16 34 D-8000 München 22, DE
Priority Data
377,67210.07.1989US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) IN-LINE NOISE ATTENUATION DEVICE FOR A GAS CONDUIT
(FR) DISPOSITIF INCORPORE D'ATTENUATION DU BRUIT POUR CONDUIT DE GAZ
Abstract
(EN)
An in-line noise attenuation device for insertion into a gas induction system, such as the air induction system of an automotive vehicle internal combustion engine. The device comprises two plastic parts snap-fitted together. One part is an outer tube (16), and the other part, an insert (18) disposed within the first part. The insert comprises a hollow ogival-shaped section (30) that is axially coextensive with a frusto-conically shaped section of the outer tube (16) to form an annular flow path of substantially constant cross section for the inducted air. The flow then passes through apertures (42) in the insert (18) to enter a venturi section. The flow continues through the venturi section and then exits the device. The venturi section (46, 48) serves to choke noise that propagates from the engine in the direction opposite the direction of airflow. The noise is reflected back to the engine by the hollow interior of the ogival-shaped section which is open toward the venturi section.
(FR)
Dispositif incorporé d'atténuation du bruit, destiné à être inséré dans un système d'admission de gaz, tel qu'un système d'admission d'air dans un moteur à combustion interne pour véhicule automobile. Le dispositif comprend deux éléments en matière plastique assemblés mutuellement par pression. Un élément est un tube extérieur (16), l'autre élément étant constitué par une pièce d'insertion (18) disposée à l'intérieur du premier élément. La pièce d'insertion comprend une partie creuse en forme d'ogive (30), s'étendant axialement sur une même longueur qu'une partie tronconique du tube extérieur (16), de manière à former un parcours d'écoulement annulaire, de section transversale sensiblement constante, pour la circulation de l'air admis. Le flux gazeux passe alors à travers des ouvertures (42) ménagées dans la pièce d'insertion (18), pour parvenir dans un venturi. Le flux continue de circuler à travers ce venturi, puis sort du dispositif. Le venturi (46, 48) sert à étouffer le bruit qui se propage à partir du moteur dans le sens opposé au sens d'écoulement du flux d'air. Le bruit est renvoyé par réflexion vers le moteur, par l'intérieur creux de la partie en forme d'ogive qui est ouverte vers le venturi.
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