EP3030779B1 - Silencer - Google Patents
Silencer Download PDFInfo
- Publication number
- EP3030779B1 EP3030779B1 EP14748213.7A EP14748213A EP3030779B1 EP 3030779 B1 EP3030779 B1 EP 3030779B1 EP 14748213 A EP14748213 A EP 14748213A EP 3030779 B1 EP3030779 B1 EP 3030779B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pipe
- silencer
- perforated
- regions
- sound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
- F02M35/1205—Flow throttling or guiding
- F02M35/1216—Flow throttling or guiding by using a plurality of holes, slits, protrusions, perforations, ribs or the like; Surface structures; Turbulence generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
- F02M35/10111—Substantially V-, C- or U-shaped ducts in direction of the flow path
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
- F02M35/1255—Intake silencers ; Sound modulation, transmission or amplification using resonance
- F02M35/1261—Helmholtz resonators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
- F02M35/1272—Intake silencers ; Sound modulation, transmission or amplification using absorbing, damping, insulating or reflecting materials, e.g. porous foams, fibres, rubbers, fabrics, coatings or membranes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
- F02M35/1283—Manufacturing or assembly; Connectors; Fixations
Definitions
- the present invention relates to a silencer, in particular an intake silencer for an internal combustion engine, as well as an intake system for a motor vehicle with such an intake silencer. It further relates to an advantageous manufacturing method for such silencer.
- any heat engine is referred to, which performs mechanical work by internal combustion of fuel.
- chemical energy from a mixture of fuel and ambient air is converted by the ignition into mechanical energy in a known as combustion chamber or combustion chamber working space of a working cylinder.
- flow or turbomachinery known from the prior art internal combustion engines, such as the included from the equipment of conventional motor vehicles gasoline engines or diesel engines operate according to this principle.
- gasoline engines or diesel engines operate according to this principle.
- For the intake of outside air and discharge of combustion gases have generic motor vehicles usually fluidly connected to the engine intake and exhaust systems, the latter being referred to in the vehicle technology as exhausts.
- a known from the prior art exhaust for a gasoline engine includes next to a nozzle, exhaust manifold and tailpipe typically a device for reducing noise emissions, such as occur in particular in the form of muzzle noises of the tailpipe.
- Such devices known in the field of vehicle acoustics as silencers can be connected downstream of this, for example, to a catalyst of the exhaust system, which is provided as required in turn causes additional sound attenuation.
- the attachment of generic silencer is done by means of appropriate stops on the vehicle floor.
- a sound-absorbing air duct for an air intake tract of an internal combustion engine, in particular of a motor vehicle with an inner tube having radial openings, and with an insulating jacket, which at least partially surrounds the inner tube radially outside.
- an outer tube is provided, which completely envelops the inner tube and the insulating jacket radially.
- a broadband damper for the intake air of an internal combustion engine is proposed. This is particularly suitable for damping the suction noise associated with a compressor for the intake air.
- the damper is formed by a line section, which is connected by means of passages with a resonance volume.
- the resonance volume can surround the line section annularly.
- an absorption material for improving the sound absorption is provided.
- a barrier layer is attached, which z. B. may consist of a nonwoven or a film. This prevents blowing of the absorbent material into the intake air where the parts of the absorbent material could damage the engine. In this way, the production of a broadband effective and inexpensive broadband damper should be possible.
- a silencer for an air flow channel in which the sound-conducting channel is provided in regions with openings whose length in the flow direction and the width within a predetermined size range, wherein, starting from a predetermined opening area of the slot-like openings, a selected depending on a specific frequency range to be damped the acoustic emission ratio of the length of the openings is selected to its width, the openings at the rear end in the flow direction inwardly and have in the flow channel protruding leading edges.
- EP 1 170 499 A1 discloses another noise reduction arrangement for air ducts.
- a line for the intake system of an internal combustion engine is formed by means of an extrusion process.
- the surface of the pipe is bored to allow the passage of air. This prevents the formation of standing waves in the system and thus reduces the resulting noise.
- the holes may be pierced during extrusion of the conduit and formed in the form of holes or slots.
- the holes may be arranged in a regular pattern, such as in rows, rings or spirals, or in a random pattern or in a combination of different patterns on the line.
- the holes can also be concentrated in certain areas on the pipe surface to improve the acoustic properties of the pipe.
- EP 1 541 856 A1 proposes to provide specific areas of sound conducting air duct in a suction pipe of an internal combustion engine, which serves as a sound-carrying line in the curvature region, with slot-like openings whose length in the flow direction and whose width are dimensioned according to a predefined size.
- the ratio of the opening length to the width is selected as a function of a specific frequency range of a sound emission to be absorbed.
- a closable flap is provided which can be placed over the slot-like openings provided in the curved area.
- a tube with at least one porous section is known, which in turn is provided with at least one slot which serves to reduce the noise generated by the fluid flow.
- a disadvantage of these known devices is their partial one-sided optimization with regard to a reduction of the muzzle sound of the intake or the absorption of certain sound frequencies.
- the object of the invention is therefore to provide a noise damper, an intake system and a manufacturing method for noise damper, which are characterized by a reduction of the muzzle sound of the intake system over a maximum bandwidth occurring frequencies.
- the basic idea of the invention is to encase a perforated pipeline for the gas mixture to be transported with a suitable absorption layer, which in turn is surrounded by a likewise perforated outer shell.
- the sound absorption or the sound attenuation results from the entirety of the construction, which in the manner of a "sandwich" of perforation.
- Absorption layer and perforation is realized.
- the attenuation is in the low-frequency range, i. amplified at frequencies up to about 1000 Hz or 1500 Hz or predominantly by the respective perforation, while the effect of the absorption layer increases with increasing frequency and attenuates or absorbed mainly in the high-frequency range from 1000 Hz or 1500 Hz.
- the construction can achieve an absorption in the entire audible range or an effective attenuation of the audible sound.
- the respective perforation has a number of perforation holes.
- the perforation holes may have any shape and / or size and / or be arranged distributed arbitrarily.
- Preferred embodiments are those in which the perforation holes are formed round. This results in acoustic advantages. Furthermore, it is preferred if at least two of the perforation holes have the same shape. With that increased the acoustic benefits. In addition, the production of the perforation is simplified.
- At least one such perforation hole has a size which is less than 7 mm. That is, the round shaped perforation hole has a diameter of less than 7 mm. Embodiments in which at least one such perforation hole has a size of less than 2 mm are particularly preferred. In this case, the smaller the perforation hole or the perforation holes, the better the acoustic, in particular sound-absorbing, properties of the noise damper.
- such a silencer can be used as an intake silencer for the intake system of an internal combustion engine, such as an internal combustion engine.
- the silencer In its function as an intake silencer, the silencer can be fluidly connected to a suction line or an air filter of the appropriately equipped intake system.
- the embodiment described as an intake silencer allows the silencer to contribute in a fluidically adapted manner to the internal combustion engine for reducing the - induced by the or the reciprocating piston of the engine - pulsating intake flow of the raw air.
- the absorption layer which can be formed by a porous Schallschluckstoff.
- the use of such a material enables the effective conversion of the sound energy transported by the gas mixture into heat energy, which is produced by the friction of the gas molecules at the pores of the sound-absorbing substance.
- an embodiment of the absorption layer made of nonwoven fabric offers.
- the use of such a batt, in particular in the form of a flexible textile fabric allows a wide variety of inventive absorption layers, which can be tailored to a wide range of application requirements by the variety of nonwoven fabric usable raw materials and manufacturing variants.
- the absorption layer is equipped with such an absorption area that it largely absorbs high-frequency vibrations of the gas mixture in the audible range.
- the absorption layer is equipped with such an absorption area that it largely absorbs high-frequency vibrations of the gas mixture in the audible range.
- the absorption layer can be effectively reduced in this way before the muzzle outlet from the intake by carrying the gas mixture vibration energy of the frequencies in question within the absorption layer at least Partially transformed into heat energy.
- such a silencer can thus comprehensively, as a broadband damper, detect a broad frequency spectrum which largely includes the sound frequencies that can be heard by the human ear, ie the sound from 50 Hz to 5 kHz, preferably between 50 Hz and 6500 kHz and above ,
- the inventive silencer can be provided with a correspondingly designed fluidic connection.
- a suitable shaping such as a hollow cylindrical connector or pair of such connectors with a predetermined axis order
- a silencer in a variety of combinations with known cavity resonators, such as.
- Helmholtz resonator or other resonators, e.g. ⁇ / 4 pipes are coupled, which allow an optimization of the device to different individual frequencies.
- the resonator is preferably arranged at a distance from the noise damper.
- the perforation of the outer shell remains at least partially, preferably completely, free and is not covered by the resonator.
- the spaced arrangement of the resonator can be achieved by a corresponding configuration of the associated connecting elements. These may for example protrude from the silencer and extend in particular transversely, preferably perpendicularly, to the flow direction of the gas mixture in the pipeline from the silencer. As a result, and advantageously, an arrangement of the resonator, which is transverse, in particular perpendicular, and provided for the flow direction of the gas mixture, is possible. As a result, an improved absorption behavior and a favorable flow of the gas mixture, regardless of the design of the noise damper achieved.
- the connecting elements are preferably spaced transversely to the flow direction of the gas mixture in the pipeline and / or arranged in order to achieve improved interaction and / or to improve the overall absorption. This also improves the flow of the gas mixture or the flow guidance, because the influence of the connecting elements on each other is reduced. Such a configuration can also help to make the noise damper space-saving.
- connection elements are fluidly connected to the pipe.
- This connection preferably takes place in connection areas of the pipeline. This means that at least one such connection region is preferably associated with the respective connection element.
- At least one of the connecting regions is perforated.
- Such a variant has the particular advantage that in the connection area on the advantageous properties of the perforation must not be waived.
- an improved interaction with the associated connecting element and in particular with the resonator is achieved. moreover This results in flow engineering advantages, in particular because no unfavorable flows occur in the connection region.
- all connection areas are perforated.
- connection regions is perforated differently than the remaining perforated region of the pipeline.
- This can be achieved by the number and / or the density and / or the size of perforation holes being different in the at least one connection region than in another region.
- the perforation holes are formed larger in the connection area.
- the perforation holes in the connection area are at least twice as large as in another area.
- such a perforation hole may have a diameter of 5 mm in the connection region, while such a perforation hole has a diameter of 2 mm in another region.
- connection region is arranged in a bent section of the pipeline. This means that the connection area is bent outwards.
- the bent configuration of the connection region leads to a corresponding flow of the gas mixture into the connection region.
- connection region is advantageously bent such that a flow into the connection region takes place in a simplified manner. This is realized, for example, in that the connection region is bent towards the associated connection element.
- FIG. 1 illustrates a noise damper 10 according to a first embodiment with reference to a sectional view.
- the term "silencer” is understood in the present context, any device for reducing noise emissions, which includes not only silencers to reduce exhaust noise, in particular intake silencer in motor vehicles. As a silencer but in principle so-called telephony silencers or scenes to understand how they in the Building technology in ventilation ducts or air duct systems are used.
- the core of the noise damper 10 forms a pipe 11, whose cross section corresponds approximately to a rounded rectangle.
- the walls of the pipe 11 are made of a substantially fluid-tight material, which is particularly suitable for the transport of air.
- Other (not shown) pipe fittings, expansion pieces, fittings, seals, fasteners such as flanges, fittings, fittings, sleeves and fasteners to support the pipe 11 may complement in a known arrangement.
- the pipe 11 is surrounded on both sides by an absorption layer 12 along a partial section, which is formed by two recessed in opposite wall surfaces of the pipe 11 acoustic panels.
- a circumferentially arranged adsorption layer 12 is conceivable, which are placed outside.
- the absorber used in this case is a porous Schallschluckstoff with through pores, such as a suitable melamine resin foam or other foam.
- Foamed material in the broadest sense of the word is understood to mean any substance that is essentially artificially produced with a cellular structure and low density. Equally included are, in particular, chemically, physically or mechanically foamed substances familiar to the person skilled in the art, such as are used in the field of plastics processing.
- the absorption layer 12 is in turn surrounded by an outer shell 13, which presses the foam to the inner pipe 11 and fixed in position.
- Both the pipe 11 and the outer shell 13 are perforated in such a way that their respective perforation holes 32 in the radial direction the pipeline 11 are slightly offset from each other.
- the arrangement, amount, shape and size of the perforation holes 32 are selected so as to give the noise attenuator 10 a high degree of absorption with respect to low Hörschallfrequenzen.
- a uniform distribution of perforation holes 32 can be seen on the outer shell 13 and on the pipe 11, respectively.
- the respective perforation hole 32 may have a size or a diameter of about 2 mm.
- FIGS. 3 and 4 show a second embodiment according to the invention of a noise damper 20, which now acts as an intake silencer in the context of an intake system 24 for an internal combustion engine in the form of a diesel engine.
- the intake silencer 20 may be connected for this purpose, for example via an optionally adjustable intake to the combustion chambers of cylinders of the diesel engine and this supply the fresh gas required for the combustion process.
- the Ansauggeräuschdämpfer 20 may also be equipped with a suitable air filter (not shown) in the form of a paper or dry air filter, wet air filter or oil bath filter, which reduces the wear on the piston, piston rings, cylinder surfaces and bearings of the diesel engine potentially reduced.
- the intake system 24 may have additional components for preheating the intake air and for fuel injection, such as by means of a mechanically or electromagnetically actuated injection valve.
- two axially parallel aligned, pipe-piece-like connecting elements 28, 29 are further integrally formed on the pipe 21 of the Ansauggeräuschdämpfers 20. Due to their hollow cylindrical shape and specific arrangement, these connecting elements 28, 29 expand the intake silencer 20 by a fluidic connection 25 for a (only in FIG FIG. 2 shown) acoustic resonator 26, which can enter via a corresponding mating terminal a plug connection with the intake muffler 20.
- the resonator 26 is spaced from the pipe 21 and the outer shell 23 and directed transversely to the flow direction of the gas mixture in the pipe 21.
- the view according to FIG. 3 lets recognize the manufacturing process used for the production of the Ansauggeräuschdämpfers 20.
- the outer shell 23 is formed by the combination of two half-shells 33, 34 assembled along a flange, between which the one in FIG. 3 is covered by the outer shell 23 hidden sound absorbing material to the pipe 21.
- the pipeline 21 can also be formed from two substantially identically shaped modules 35, wherein optional spacer elements to be inserted between the half-shells 33, 34 permit adaptation of the intake silencer 20 to absorption layers of different thickness.
- FIG. 5 shows a section through such a silencer 10, 20.
- the first half-shell 33 can be seen for producing the outer shell 23 having the first connecting element 28 and the second connecting element 29, which is integral to the first half-shell 33 and thus integrally on the noise damper 20th are formed.
- the fluidic connection between the first connection element 28 and the pipeline 11 is realized via a first connection region 30 of the first module 35 and thus of the pipeline 21.
- first connection region 30 and the second connection region 31 are at least partially bent. That is, the connection portions 30, 31 are disposed in a bent portion of the first module 35 and the pipe 21, respectively.
- the bending is realized here by a convex deformation of the first module 35 with respect to the connecting elements 28, 29. This means that the first module 35 or the pipeline 21 is bent in the respective connection region 30, 31 towards the associated connection element 30, 31.
- connecting regions 30, 31 are perforated.
- the connecting regions 30, 31 are perforated differently than other perforated regions of the pipeline 21. This other perforation is realized in the example shown by a larger formation of perforation holes 32 in the connecting regions 30, 31.
- connection elements 28, 29 are arranged at a distance. Accordingly, the connection areas 30, 31 are arranged at a distance. In this case, the connecting elements 28, 29 transverse to Direction of flow of the gas mixture in the pipe 11, 21 spaced or arranged offset. In addition, it can be seen that the orientation of the connecting elements 28, 29 extends transversely to the flow direction of the gas mixture in the pipeline 21. This means that the connecting elements 28, 29 project transversely to the flow direction from the noise damper 20.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Exhaust Silencers (AREA)
Description
Die vorliegende Erfindung betrifft einen Geräuschdämpfer, insbesondere einen Ansauggeräuschdämpfer für eine Verbrennungskraftmaschine, sowie eine Ansauganlage für ein Kraftfahrzeug mit einem solchen Ansauggeräuschdämpfer. Sie betrifft ferner ein vorteilhaftes Herstellungsverfahren für derartige Geräuschdämpfer.The present invention relates to a silencer, in particular an intake silencer for an internal combustion engine, as well as an intake system for a motor vehicle with such an intake silencer. It further relates to an advantageous manufacturing method for such silencer.
Als Verbrennungskraftmaschine wird jegliche Wärmekraftmaschine bezeichnet, welche durch innere Verbrennung von Treibstoff mechanische Arbeit verrichtet. Zu diesem Zweck wird in einem als Brennraum oder Verbrennungsraum bekannten Arbeitsraum eines Arbeitszylinders chemische Energie aus einem Gemisch von Kraftstoff und Umgebungsluft durch dessen Zündung in mechanische Energie umgewandelt. Neben sogenannten Strömungs- oder Turbomaschinen arbeiten insbesondere aus dem Stand der Technik bekannte Verbrennungsmotoren, etwa die von der Ausstattung konventioneller Kraftfahrzeuge umfassten Ottomotoren oder Dieselmotoren, nach diesem Wirkprinzip. Zur Ansaugung von Außenluft und Ableitung von Verbrennungsabgasen verfügen gattungsgemäße Kraftfahrzeuge üblicherweise über mit dem Verbrennungsmotor fluidisch verbundene Ansaug- und Abgasanlagen, wobei Letztere in der Fahrzeugtechnik auch als Auspuffe bezeichnet werden.As an internal combustion engine, any heat engine is referred to, which performs mechanical work by internal combustion of fuel. For this purpose, chemical energy from a mixture of fuel and ambient air is converted by the ignition into mechanical energy in a known as combustion chamber or combustion chamber working space of a working cylinder. In addition to so-called flow or turbomachinery known from the prior art internal combustion engines, such as the included from the equipment of conventional motor vehicles gasoline engines or diesel engines operate according to this principle. For the intake of outside air and discharge of combustion gases have generic motor vehicles usually fluidly connected to the engine intake and exhaust systems, the latter being referred to in the vehicle technology as exhausts.
Ein aus dem Stand der Technik bekannter Auspuff für einen Ottomotor umfasst dabei neben einem Hosenrohr, Abgaskrümmer und Endrohr typischerweise eine Vorrichtung zur Reduzierung von Schallemissionen, wie sie insbesondere in Gestalt von Mündungsgeräuschen des Endrohrs auftreten. Solche in der Fahrzeugakustik als Schalldämpfer bekannte Vorrichtungen können hierzu etwa einem bedarfsweise vorgesehenen Katalysator der Abgasanlage nachgeschaltet sein, welcher seinerseits eine zusätzliche Schalldämpfung bewirkt. Die Anbringung gattungsgemäßer Schalldämpfer erfolgt mittels entsprechender Haltepunkte am Fahrzeugboden.A known from the prior art exhaust for a gasoline engine includes next to a nozzle, exhaust manifold and tailpipe typically a device for reducing noise emissions, such as occur in particular in the form of muzzle noises of the tailpipe. Such devices known in the field of vehicle acoustics as silencers can be connected downstream of this, for example, to a catalyst of the exhaust system, which is provided as required in turn causes additional sound attenuation. The attachment of generic silencer is done by means of appropriate stops on the vehicle floor.
So offenbart etwa
Auch in
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Schließlich offenbart
Ein Nachteil dieser bekannten Vorrichtungen liegt in ihrer teilweise einseitigen Optimierung im Hinblick auf eine Reduktion des Mündungsschalls der Ansauganlage oder die Absorption bestimmter Schallfrequenzen. Aufgabe der Erfindung ist daher, einen Geräuschdämpfer, eine Ansauganlage sowie ein Herstellungsverfahren für Geräuschdämpfer zu schaffen, welche sich durch eine Verringerung des Mündungsschalls der Ansauganlage über eine größtmögliche Bandbreite auftretender Frequenzen auszeichnen.A disadvantage of these known devices is their partial one-sided optimization with regard to a reduction of the muzzle sound of the intake or the absorption of certain sound frequencies. The object of the invention is therefore to provide a noise damper, an intake system and a manufacturing method for noise damper, which are characterized by a reduction of the muzzle sound of the intake system over a maximum bandwidth occurring frequencies.
Diese Aufgabe wird durch einen Geräuschdämpfer mit den Merkmalen des Anspruchs 1, sowie durch ein Herstellungsverfahren mit den Merkmalen des Anspruchs 10 gelöst.This object is achieved by a noise damper with the features of claim 1, and by a manufacturing method having the features of
Grundgedanke der Erfindung ist dabei, eine perforierte Rohrleitung für das zu transportierende Gasgemisch mit einer geeigneten Absorptionsschicht zu ummanteln, die ihrerseits von einer ebenfalls perforierten Außenhülle umschlossen wird. Die beschriebene Kombination zweier Geräuschminderungstechniken gestattet durch die Perforation der Rohrleitung in erster Stufe eine vorteilhafte Reduktion des Mündungsschalls in niedrigen Frequenzbereichen während die die Rohrleitung umgebende Absorptionsschicht in zweiter Stufe vor allem verbleibende hochfrequente Schwingungen des Gasgemischs weitestgehend eliminiert, ohne zu einer Warmluftansaugung zu führen.The basic idea of the invention is to encase a perforated pipeline for the gas mixture to be transported with a suitable absorption layer, which in turn is surrounded by a likewise perforated outer shell. The described combination of two noise reduction techniques allowed by the perforation of the pipe in the first stage, an advantageous reduction of the muzzle sound in low frequency ranges while surrounding the pipe absorption layer in the second stage, above all remaining high-frequency oscillations of the gas mixture largely eliminated, without leading to a hot air intake.
Das heißt, dass die Schallabsorption bzw. die Schalldämpfung sich aus der Gesamtheit der Konstruktion ergibt, die in der Art eines "Sandwichs" aus Perforation. Absorptionsschicht und Perforation realisiert ist. Dabei erfolgt die Dämpfung im niederfrequenten Bereich, d.h. bei Frequenzen bis ca. 1000 Hz oder 1500 Hz verstärkt bzw. vorwiegend durch die jeweilige Perforation, während die Wirkung der Absorptionsschicht mit steigender Frequenz steigt und vorwiegend im hochfrequenten Bereich ab 1000 Hz bzw. 1500 Hz dämpft bzw. absorbiert. Somit kann durch die Konstruktion eine Absorption im gesamten hörbaren Bereich bzw. eine effektive Dämpfung des Hörschalls erreicht werden.This means that the sound absorption or the sound attenuation results from the entirety of the construction, which in the manner of a "sandwich" of perforation. Absorption layer and perforation is realized. The attenuation is in the low-frequency range, i. amplified at frequencies up to about 1000 Hz or 1500 Hz or predominantly by the respective perforation, while the effect of the absorption layer increases with increasing frequency and attenuates or absorbed mainly in the high-frequency range from 1000 Hz or 1500 Hz. Thus, the construction can achieve an absorption in the entire audible range or an effective attenuation of the audible sound.
Die jeweilige Perforation weist eine Anzahl von Perforationslöchern auf. Dabei können die Perforationslöcher eine beliebige Form und/oder Größe aufweisen und/oder beliebig verteilt angeordnet sein.The respective perforation has a number of perforation holes. The perforation holes may have any shape and / or size and / or be arranged distributed arbitrarily.
Bevorzugt sind Ausgestaltungen, bei denen die Perforationslöcher rund geformt sind. Hierdurch ergeben sich akustische Vorteile. Ferner ist es bevorzugt, wenn zumindest zwei der Perforationslöcher die gleiche Form aufweise. Damit werden die akustischen Vorteile gesteigert. Zudem ist die Herstellung der Perforation vereinfacht.Preferred embodiments are those in which the perforation holes are formed round. This results in acoustic advantages. Furthermore, it is preferred if at least two of the perforation holes have the same shape. With that increased the acoustic benefits. In addition, the production of the perforation is simplified.
Bei vorteilhaften Varianten weist zumindest ein solches Perforationsloch eine Größe auf, die weniger als 7 mm beträgt. Das heißt, dass das rund geformte Perforationsloch einen Durchmesser von weniger als 7 mm aufweist. Besonders bevorzugt sind Ausführungsformen, bei denen wenigstens ein solches Perforationsloch eine Größe von weniger als 2 mm aufweist. Dabei gilt, je kleiner das Perforationsloch bzw. die Perforationslöcher, desto besser die akustischen, insbesondere schallabsorbierenden, Eigenschaften des Geräuschdämpfers.In advantageous variants, at least one such perforation hole has a size which is less than 7 mm. That is, the round shaped perforation hole has a diameter of less than 7 mm. Embodiments in which at least one such perforation hole has a size of less than 2 mm are particularly preferred. In this case, the smaller the perforation hole or the perforation holes, the better the acoustic, in particular sound-absorbing, properties of the noise damper.
In einer bevorzugten Ausführungsform lässt sich ein derartiger Geräuschdämpfer als Ansauggeräuschdämpfer für die Ansauganlage einer Verbrennungskraftmaschine, etwa eines Verbrennungsmotors, einsetzen. In seiner Funktion als Ansauggeräuschdämpfer kann der Geräuschdämpfer dabei mit einer Ansaugleitung oder einem Luftfilter der entsprechend ausgerüsteten Ansauganlage fluidisch verbunden werden. Die beschriebene Ausgestaltung als Ansauggeräuschdämpfer gestattet es dem Geräuschdämpfer, in strömungstechnisch auf den Verbrennungsmotor abgestimmter Weise zur Verringerung der - durch den oder die Hubkolben des Motors hervorgerufenen - pulsierenden Ansaugströmung der Rohluft beizutragen.In a preferred embodiment, such a silencer can be used as an intake silencer for the intake system of an internal combustion engine, such as an internal combustion engine. In its function as an intake silencer, the silencer can be fluidly connected to a suction line or an air filter of the appropriately equipped intake system. The embodiment described as an intake silencer allows the silencer to contribute in a fluidically adapted manner to the internal combustion engine for reducing the - induced by the or the reciprocating piston of the engine - pulsating intake flow of the raw air.
Von besonderem Augenmerk ist dabei die Absorptionsschicht, welche durch einen porösen Schallschluckstoff gebildet werden kann. Die Verwendung eines derartigen Werkstoffs ermöglicht die effektive Umwandlung der vom Gasgemisch transportierten Schallenergie in Wärmeenergie, welche durch die Reibung der Gasmoleküle an den Poren des Schallschluckstoffs entsteht.Of particular note is the absorption layer, which can be formed by a porous Schallschluckstoff. The use of such a material enables the effective conversion of the sound energy transported by the gas mixture into heat energy, which is produced by the friction of the gas molecules at the pores of the sound-absorbing substance.
Als Schallschluckstoff empfiehlt sich hierbei in besonderem Maße ein Schaumstoff. Die hohe Kompressibilität dieses Werkstoffs erlaubt es, im Rahmen des Herstellungsprozesses das Volumen der Absorptionsschicht durch Druck zu verkleinern, was sich unter fertigungspraktischen Gesichtspunkten als hilfreich erweist. Bei nur geringer Festigkeit zeichnet sich eine auf Schaumstoff basierende Absorptionsschicht zudem durch eine sehr niedrige Dichte und Wärmeleitfähigkeit aus und gewährleistet eine unkomplizierte Bearbeitbarkeit mit geringem Werkzeugaufwand. Schließlich ist die aus Schaumstoff gefertigte Absorptionsschicht nahezu eigenspannungsfrei.As Schallschluckstoff this is particularly recommended a foam. The high compressibility of this material makes it possible, as part of the manufacturing process, to reduce the volume of the absorption layer by pressure, which proves to be helpful from a production-practical point of view. With only low strength, a foam-based absorption layer is also characterized by a very low density and thermal conductivity and ensures uncomplicated workability with little tooling. Finally, the foam-made absorption layer is almost free of inherent stress.
Als Alternative zu schaumbasierten Werkstoffen bietet sich eine Ausführung der Absorptionsschicht aus Vliesstoff an. Die Verwendung eines solchen Faserflors, insbesondere in Gestalt eines flexiblen textilen Flächengebildes, gestattet eine breite Gestaltungsvielfalt erfindungsgemäßer Absorptionsschichten, die durch die Vielzahl zur Vliesherstellung nutzbarer Rohstoffe und Herstellungsvarianten einem breiten Spektrum von Anwendungsanforderungen gezielt angepasst werden können.As an alternative to foam-based materials, an embodiment of the absorption layer made of nonwoven fabric offers. The use of such a batt, in particular in the form of a flexible textile fabric, allows a wide variety of inventive absorption layers, which can be tailored to a wide range of application requirements by the variety of nonwoven fabric usable raw materials and manufacturing variants.
Gemäß einer vorteilhaften Ausführungsform ist die Absorptionsschicht dabei mit einem solchen Absorptionsbereich ausgestattet, dass sie hochfrequente Schwingungen des Gasgemischs im hörbaren Bereich weitestgehend absorbiert. Entsprechende, von Fahrzeuginsassen und anderen Verkehrsteilnehmern als besonders unangenehm empfundene höher frequente tonale Geräusche z.B. breitbandige Rauschanteile, Pfeif- oder Quietschgeräusche lassen sich auf diesem Wege bereits vor dem Mündungsaustritt aus der Ansauganlage wirksam verringern, indem vom Gasgemisch getragene Schwingungsenergie der fraglichen Frequenzen innerhalb der Absorptionsschicht zumindest teileweise in Wärmeenergie transformiert wird. In Kombination mit einer geeigneten Perforierung der Rohrleitung, welche die Wirkung der Absorptionsschicht in einem niederfrequenten Bereich ergänzen kann, vermag ein solcher Geräuschdämpfer somit gleichsam als Breitbanddämpfer ein breites Frequenzspektrum zu erfassen, welches die für das menschliche Ohr vernehmbaren Schallfrequenzen, also den Hörschall zwischen 50 Hz und 5 kHz, vorzugsweise zwischen 50 Hz und 6500 kHz und darüber, in weiten Teilen einschließt.According to an advantageous embodiment, the absorption layer is equipped with such an absorption area that it largely absorbs high-frequency vibrations of the gas mixture in the audible range. Corresponding, perceived by vehicle occupants and other road users as particularly unpleasant higher-frequency tonal noises such as broadband noise, whistling or squealing can be effectively reduced in this way before the muzzle outlet from the intake by carrying the gas mixture vibration energy of the frequencies in question within the absorption layer at least Partially transformed into heat energy. In combination with a suitable perforation of the pipeline, which the effect of the absorption layer in a low-frequency range Thus, such a silencer can thus comprehensively, as a broadband damper, detect a broad frequency spectrum which largely includes the sound frequencies that can be heard by the human ear, ie the sound from 50 Hz to 5 kHz, preferably between 50 Hz and 6500 kHz and above ,
Um den Geräuschdämpfer zusätzlich zu seiner dämpfenden Wirkung mit einem akustischen Resonator verbinden zu können, der eine vorteilhafte Beeinflussung der Resonanzfrequenz einer gattungsgemäßen Ansauganlage erlaubt, lässt sich der erfindungsgemässe Geräuschdämpfer mit einem entsprechend gestalteten fluidischen Anschluss versehen. Unter der Voraussetzung einer geeigneten Formgebung, etwa als hohlzylindrische Steckverbindung oder Paar solcher Steckverbindungen mit einer vorgegebenen Achsenordnung, kann ein derartiger Geräuschdämpfer in verschiedensten Kombinationen mit bekannten Hohlraumresonatoren , wie z.B. Helmholtzresonator oder anderen Resonatoren, wie z.B. λ/4-Rohre gekoppelt werden, die eine Optimierung der Vorrichtung auf verschiedene Einzelfrequenzen ermöglichen. Eine unkomplizierte konstruktive Realisierung resultiert in diesem Fall aus der integralen Ausbildung des oder der Verbindungselemente mit der Rohrleitung.In order to connect the silencer in addition to its damping effect with an acoustic resonator, which allows an advantageous effect on the resonant frequency of a generic intake system, the inventive silencer can be provided with a correspondingly designed fluidic connection. Given a suitable shaping, such as a hollow cylindrical connector or pair of such connectors with a predetermined axis order, such a silencer in a variety of combinations with known cavity resonators, such as. Helmholtz resonator or other resonators, e.g. λ / 4 pipes are coupled, which allow an optimization of the device to different individual frequencies. An uncomplicated structural realization results in this case from the integral design of the or the connecting elements with the pipeline.
Dabei ist der Resonator bevorzugt beabstandet zum Geräuschdämpfer angeordnet. In der Folge bleibt die Perforation der Außenhülle zumindest bereichsweise, vorteilhaft gänzlich, frei und wird nicht vom Resonator abgedeckt. Eine solche Ausgestaltung ist insbesondere deshalb möglich, weil der Geräuschdämpfer, insbesondere die Außenhülle, keinen den Geräuschdämpfer umgebenden Raum, insbesondere keinen Resonator, benötigt, um die erwünschte Schallabsorption zu erzielen.In this case, the resonator is preferably arranged at a distance from the noise damper. As a result, the perforation of the outer shell remains at least partially, preferably completely, free and is not covered by the resonator. Such a configuration is particularly possible because the noise damper, in particular the outer shell, no space surrounding the noise damper, in particular no resonator required to achieve the desired sound absorption.
Die beabstandete Anordnung des Resonators kann durch eine entsprechende Ausgestaltung der zugehörigen Verbindungselemente erreicht werden. Diese können beispielsweise vom Geräuschdämpfer abstehen und sich insbesondere quer, vorzugsweise senkrecht, zur Strömungsrichtung des Gasgemischs in der Rohrleitung vom Geräuschdämpfer erstrecken. In der Folge und vorteilhaft ist eine quer, insbesondere senkrecht, zur Strömungsrichtung des Gasgemischs vorgesehene Anordnung des Resonators möglich. Hierdurch wird eine verbessertes Absorptionsverhalten sowie eine günstige Strömung des Gasgemischs, und zwar unabhängig von der Ausgestaltung des Geräuschdämpfers, erzielt.The spaced arrangement of the resonator can be achieved by a corresponding configuration of the associated connecting elements. These may for example protrude from the silencer and extend in particular transversely, preferably perpendicularly, to the flow direction of the gas mixture in the pipeline from the silencer. As a result, and advantageously, an arrangement of the resonator, which is transverse, in particular perpendicular, and provided for the flow direction of the gas mixture, is possible. As a result, an improved absorption behavior and a favorable flow of the gas mixture, regardless of the design of the noise damper achieved.
Hierbei sind die Verbindungselemente vorzugsweise quer zur Strömungsrichtung des Gasgemischs in der Rohrleitung beabstandet und/oder versetzt angeordnet, um eine verbessertes Zusammenwirken zu erreichen und/oder die Absorption insgesamt zu verbessern. Auch hierdurch wird die Strömung des Gasgemischs bzw. die Strömungsführung verbessert, weil der Einfluss der Verbindungselemente aufeinander reduziert wird. Eins solche Ausgestaltung kann zudem dazu beitragen, den Geräuschdämpfer bauraumsparend auszubilden.Here, the connecting elements are preferably spaced transversely to the flow direction of the gas mixture in the pipeline and / or arranged in order to achieve improved interaction and / or to improve the overall absorption. This also improves the flow of the gas mixture or the flow guidance, because the influence of the connecting elements on each other is reduced. Such a configuration can also help to make the noise damper space-saving.
Vorteilhaft sind ferner Ausgestaltungen, bei denen die Verbindungselemente fluidisch mit der Rohleitung verbunden sind. Diese Verbindung erfolgt bevorzugt in Verbindungsbereichen der Rohrleitung. Das heißt, dass dem jeweiligen Verbindungselement vorzugsweise wenigstens ein solcher Verbindungsbereich zugeordnet ist.Also advantageous are embodiments in which the connecting elements are fluidly connected to the pipe. This connection preferably takes place in connection areas of the pipeline. This means that at least one such connection region is preferably associated with the respective connection element.
Bei eine vorteilhaften Variante ist wenigstens einer der Verbindungsbereiche perforiert. Eine solche Variante hat insbesondere den Vorteil, dass im Verbindungsbereich auf die vorteilhaften Eigenschaften der Perforation nicht verzichtet werden muss. Darüber hinaus wird ein verbessertes Zusammenwirken mit dem zugehörigen Verbindungselement und insbesondere mit dem Resonator erreicht. Zudem ergeben sich hierdurch Strömungstechnische Vorteile, insbesondere weil im Verbindungsbereich keine ungünstigen Strömungen entstehen. Besonders bevorzugt sind alle Verbindungsbereiche perforiert.In an advantageous variant, at least one of the connecting regions is perforated. Such a variant has the particular advantage that in the connection area on the advantageous properties of the perforation must not be waived. In addition, an improved interaction with the associated connecting element and in particular with the resonator is achieved. moreover This results in flow engineering advantages, in particular because no unfavorable flows occur in the connection region. Particularly preferably, all connection areas are perforated.
Bevorzugt ist wenigstens eine der Verbindungsbereiche anders perforiert als der übrige perforierte Bereich der Rohrleitung. Die kann dadurch erreicht sein, dass in dem wenigstens einen Verbindungsbereich die Anzahl und/oder die Dichte und/oder die Größe von Perforationslöchern anders ist, als in einem anderen Bereich. Dabei kann vorgesehen sein, dass der Perforationslöcher im Verbindungsbereich größer ausgebildet sind. Insbesondere sind die Perforationslöcher im Verbindungsbereich wenigstens doppelt so groß als in einem anderen Bereich. Beispielsweise kann ein solches Perforationsloch im Verbindungsbereich einen Durchmesser von 5 mm aufweisen, während ein solches Perforationsloch in einem anderen Bereich einen Durchmesser von 2 mm aufweist.Preferably, at least one of the connection regions is perforated differently than the remaining perforated region of the pipeline. This can be achieved by the number and / or the density and / or the size of perforation holes being different in the at least one connection region than in another region. It can be provided that the perforation holes are formed larger in the connection area. In particular, the perforation holes in the connection area are at least twice as large as in another area. For example, such a perforation hole may have a diameter of 5 mm in the connection region, while such a perforation hole has a diameter of 2 mm in another region.
Bei einer vorteilhaften Weiterbildung ist wenigstens einer der Verbindungsbereiche in einem gebogenen Abschnitt der Rohrleitung angeordnet. Das heißt, dass der Verbindungsbereich gebogen ausgestaltet hin. Die gebogene Ausgestaltung des Verbindungsbereichs führt zu einer entsprechenden Strömung des Gasgemischs in Verbindungsbereich.In an advantageous development, at least one of the connection regions is arranged in a bent section of the pipeline. This means that the connection area is bent outwards. The bent configuration of the connection region leads to a corresponding flow of the gas mixture into the connection region.
Der Verbindungsbereich ist vorteilhaft derart gebogen, dass hierdurch eine Strömung in den Verbindungsbereich vereinfacht erfolgt. Dies ist beispielsweise dadurch realisiert, dass der Verbindungsbereich hin zum zugehörigen Verbindungselement gebogen ist.The connection region is advantageously bent such that a flow into the connection region takes place in a simplified manner. This is realized, for example, in that the connection region is bent towards the associated connection element.
Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.
Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert.Preferred embodiments of the invention are illustrated in the drawings and will be explained in more detail in the following description.
Es zeigen, jeweils schematisch
-
Figur 1 einen Querschnitt eines Geräuschdämpfers gemäß einer ersten Ausführungsform, -
Figur 2 eine Ansicht einer Ansauganlage mit einem Geräuschdämpfer gemäß einer zweiten Ausführungsform der Erfindung, -
Figur 3 undFigur 4 jeweils eine Teilansicht des Geräuschdämpfers derFigur 2 aus unterschiedlichen Perspektiven, -
Figur 5 eine räumliche Ansicht eines Schnitts durch den Geräuschdämpfer.
-
FIG. 1 a cross section of a noise damper according to a first embodiment, -
FIG. 2 a view of an intake system with a silencer according to a second embodiment of the invention, -
FIG. 3 andFIG. 4 each a partial view of the muffler ofFIG. 2 from different perspectives, -
FIG. 5 a spatial view of a section through the silencer.
Den Kern des Geräuschdämpfers 10 bildet dabei eine Rohrleitung 11, deren Querschnitt näherungsweise einem abgerundeten Rechteck entspricht. Die Wandungen der Rohrleitung 11 bestehen aus einem im Wesentlichen fluiddichten Werkstoff, der insbesondere zur Beförderung von Luft geeignet ist. Weitere (nicht dargestellte) Rohrformteile, Ausdehnungsstücke, Armaturen, Dichtungen, Verbindungselemente wie Flansche, Fittinge, Verschraubungen, Muffen sowie Befestigungselemente zur Unterstützung mögen die Rohrleitung 11 in bekannter Anordnung ergänzen.The core of the
Wie der Längsschnitt der
Die Absorptionsschicht 12 wird ihrerseits von einer Außenhülle 13 umgeben, die den Schaumstoff an die innen liegende Rohrleitung 11 anpresst und in seiner Position fixiert. Sowohl die Rohrleitung 11 als auch die Außenhülle 13 sind dabei in einer Weise perforiert, dass ihre jeweiligen Perforationslöcher 32 in radialer Richtung der Rohrleitung 11 geringfügig gegeneinander versetzt sind. Im Übrigen sind Anordnung, Menge, Form und Größe der Perforationslöcher 32 so gewählt, dass sie dem Geräuschdämpfer 10 bezüglich niedriger Hörschallfrequenzen einen hohen Absorptionsgrad verleihen.The
Im gezeigten Beispiel sind an der Außenhülle 13 und an der Rohrleitung 11 jeweils eine gleichmäßige Verteilung von Perforationslöchern 32 zu erkennen. Dabei kann das jeweilige Perforationsloch 32 eine Größe bzw. einen Durchmesser von ca. 2 mm aufweisen.In the example shown, a uniform distribution of perforation holes 32 can be seen on the
Die
In der vorliegenden Ausführungsform sind an die Rohrleitung 21 des Ansauggeräuschdämpfers 20 ferner zwei achsparallel ausgerichtete, rohrstückartige Verbindungselemente 28, 29 angeformt. Aufgrund ihrer hohlzylindrischen Formgebung und spezifischen Anordnung erweitern diese Verbindungselemente 28, 29 den Ansauggeräuschdämpfer 20 um einen fluidischen Anschluss 25 für einen (lediglich in
Dabei ist der Resonator 26 von der Rohrleitung 21 sowie der Außenhülle 23 beabstandet angeordnet und quer zur Strömungsrichtung des Gasgemischs in der Rohrleitung 21 gerichtet.In this case, the
Die Ansicht gemäß
Die fluidische Verbindung zwischen dem ersten Verbindungselement 28 und der Rohrleitung 11 ist über einen ersten Verbindungsbereich 30 des ersten Moduls 35 und somit der Rohrleitung 21 realisiert. Entsprechendes gilt für das zweite Verbindungselement 29, das über einen zweiten Verbindungsbereich 31 des ersten Moduls 35 bzw. der Rohrleitung 21 fluidisch mit der Rohrleitung 21 verbunden ist. Aufgrund der zylindrischen Form der Verbindungselemente 28, 29 sind die Verbindungsbereiche 30, 31 bei einer Draufsicht in Richtung der Achse des zugehörigen Verbindungselements 28, 29 kreisförmig.The fluidic connection between the
Dabei sind der erste Verbindungsbereich 30 und der zweite Verbindungsbereich 31 zumindest teilweise gebogen. Das heißt, das die Verbindungsbereiche 30, 31 in einem gebogenen Abschnitt des ersten Moduls 35 bzw. der Rohrleitung 21 angeordnet sind. Die Biegung ist hierbei durch eine bezüglich der Verbindungselemente 28, 29 konvexe Umformung des ersten Moduls 35 realisiert. Das heißt, dass das erste Modul 35 bzw. die Rohrleitung 21 im jeweiligen Verbindungsbereich 30, 31 hin zum zugehörigen Verbindungselement 30, 31 gebogen ist.In this case, the
In
In den
Claims (10)
- A silencer (10, 20), comprising- a pipe (11, 12), which is perforated at least in regions, for conducting a gas mixture,- an absorption layer (12), which surrounds the pipe (11, 12) at least in regions, for absorbing a sound transmitted by the gas mixture and- an outer casing (13, 23), which is perforated at least in regions and surrounds the absorption layer (12), for encasing the pipe (11, 12),
characterized in that- the silencer (10, 20) comprises a fluidic connector (25) for connecting an acoustic resonator (26), to the pipe (11, 21),- the connector (25) has a substantially hollow-cylindrical first connecting element (28)and a substantially hollow-cylindrical second connecting element (29) arranged axially parallel to the first connecting element (28),- the pipe (11, 21) has a first connecting region (30) for fluidically connecting to the first connecting element (28) and a second connecting region (31) for fluidically connecting to the second connecting element (29),- at least one of the connecting regions (30, 31) is perforated. - The silencer according to claim 1,
characterized in that
the absorption layer (12) is composed in such a manner that it is capable of substantially completely absorbing the sound in a high frequency range. - The silencer according to claim 1 or 2,
characterized in that
the pipe (11, 21) is perforated in such a manner that a buildup of resonant frequencies is changed, whereby an outlet sound is reduced in low frequency ranges. - The silencer according to claim 3 in connection with claim 2,
characterized in that
the absorption layer (12) is composed in such a manner and the pipe (11, 21) is perforated in such a manner that the low frequency range and the high frequency range supplement one another so as to form a wide frequency band that comprises the audible sound. - The silencer according to any one of claims 1 to 4,
characterized in that
the first connecting element (28) has an axis that lies substantially perpendicular to a flow direction of the gas mixture in the pipe (11, 21). - The silencer according to any one of claims 1 to 5,
characterized in that
the first connecting element (28) and/or the second connecting element (28) are/is integrally molded on the pipe (11, 21). - The silencer according to any one of claims 1 to 6,
characterized in that
the connecting elements (28, 29) are arranged spaced apart transverse to the flow direction of the gas mixture in the pipe (11, 21). - The silencer according to any one of claims 1 to 7,
characterized in that
at least one of the connecting regions (30, 31) is perforated differently from another region of the pipe (11, 21). - The silencer according to any one of claims 1 to 8,
characterized in that
at least one of the connecting regions (30, 31) is bent. - A production method for a silencer (10, 20) according to any one of claims 1 to 9, according to which a first half shell (33) and a second half shell (34), the first half shell (33) and/or the second half shell (34) being perforated at least in regions, are joined together to form an outer casing (13, 23) in such a manner that they enclose a pipe (11, 21) which is perforated at least in regions and which is arranged between the first half shell (33) and the second half shell (34), wherein a porous sound-absorbing material, in particular a foam, is pressed between at least one of the half shells (33, 34) and the pipe (11, 21) so as to form an absorption layer (12).
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DE102013215636.7A DE102013215636A1 (en) | 2013-08-08 | 2013-08-08 | Silencer |
PCT/EP2014/067022 WO2015018910A1 (en) | 2013-08-08 | 2014-08-07 | Silencer |
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EP3030779B1 true EP3030779B1 (en) | 2018-06-13 |
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EP (1) | EP3030779B1 (en) |
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CN105722705B (en) * | 2013-11-19 | 2019-02-22 | 康明斯过滤Ip公司 | High frequency silencer for gas handling system |
US20180171865A1 (en) * | 2015-06-11 | 2018-06-21 | Eaton Corporation | Supercharger integral resonator |
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- 2014-08-07 US US14/910,682 patent/US9605631B2/en not_active Expired - Fee Related
- 2014-08-07 WO PCT/EP2014/067022 patent/WO2015018910A1/en active Application Filing
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EP3030779A1 (en) | 2016-06-15 |
DE102013215636A1 (en) | 2015-02-12 |
US9605631B2 (en) | 2017-03-28 |
US20160195049A1 (en) | 2016-07-07 |
WO2015018910A1 (en) | 2015-02-12 |
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