DE102019102245A1 - Intake silencer for turbochargers - Google Patents

Abstract

The invention relates to an intake silencer (1) with a cylindrical housing (10), with a first and second opposite end wall (20, 30) and an air-permeable jacket wall (40) which extends between the end walls (20, 30) and enters a main flow (E) for the radial entry of charge air and with a main flow outlet (H) formed in the area of an end wall (30) for the axial air outlet of the charge air, a plurality of damping elements (50) and connecting webs (60 ) extend from the second end wall (20) to the first end wall (30), the respective connecting webs (60) being arranged between a radially outer side edge region (51) of the damping elements (50) and the outer wall (40).

Description

The invention relates to an intake silencer for a compressor of an exhaust gas turbocharger and a turbocharger with such an intake silencer.

A generic filter silencer is known for example from the EP 0574605 A1 . Filter silencers of this type are used, for example, on the intake side of a compressor that compresses combustion air and supplies it to an internal combustion engine. Such a compressor is driven by the exhaust gas turbine of an exhaust gas turbocharger.

This creates undesirable high-amplitude sound waves that are released to the environment through the air intake duct. These sound waves are therefore usually dampened by means of a silencer. For this purpose, ambient air flows through a filter arranged on the circumference of a muffler into the interior of the muffler equipped with damping elements, then flows past the damping elements, and is deflected by guide elements to the compressor wheel, from which sound waves emanate against the air flow.

From the DE 19514990 B4 A filter silencer is known in which the advantages described can be seen in the fact that only damping elements are used which are of the same type and consist of two parts, namely a damping plate and an absorption element.

The EP 2 386 761 A2 discloses an intake silencer with a cylindrical housing. The housing has opposite circular end walls and a tubular jacket wall extending between these end walls, which provides a main flow inlet for a main flow of a first medium, a main flow outlet for the main flow of this first medium being formed in the region of an end wall. When the charge air flows through the intake muffler, it is deflected from an essentially radial inflow into an essentially axial outflow, so as to flow against the downstream compressor in the axial direction.

Intake silencers known from the prior art have a number of disadvantages.

The housing stiffness is not solved satisfactorily on a regular basis or the construction results in disadvantages for the characteristic natural frequencies and the vibration behavior of the motor. Component natural frequencies are so often in the range of typical engine main excitation orders, which means that the intake silencer is exposed to high dynamic loads. Furthermore, it is increasingly the case that valid guide values for mechanical vibrations of engine components are exceeded in the large engine environment.

Furthermore, it is desirable to improve the housing stiffness and not to adversely affect the main functions, namely adequate acoustic damping and the lowest possible suction pressure loss, and to achieve a weight reduction.

In addition, in the case of the intake silencers known in the prior art, the accessibility to individual parts, in particular to the damping elements, is inadequately solved such that disassembly, e.g. necessary for service purposes, is not completely possible when installed on the engine.

Proceeding from this, the object of the present invention is to create a novel intake silencer and a turbocharger with such an intake silencer, which overcomes the aforementioned disadvantages and can be produced cost-effectively.

This object is achieved by the combination of features according to claim 1.

A basic idea of the present invention is that the inventive concept provides an easily mountable arrangement of the damping elements of the muffler, which axially extends in the openings or recesses in the end walls provided radially from the inside to the outside, that is to say in the direction of the rotor axis of the turbocharger. be inserted. For this purpose, the housing has a plurality of appropriately shaped openings on one end wall, the cross-sectional profile of which is preferably designed to correspond to the cross-sectional profile of the damping elements and a flow channel runs between two immediately adjacent damping elements. Dismantling / assembly of the damping elements can be done very simply by removing the covers, which are ideally designed in several parts, without dismantling the peripheral perforated plate located on the jacket wall and the typically attached filter mat.

According to the invention, an intake silencer with a cylindrical housing is proposed for this purpose, with a first and a second opposite end wall (front and rear end wall) and one between the end walls extending air-permeable jacket wall, which forms a main flow inlet for the radial entry of charge air and with a main flow outlet formed in the region of an end wall for the axial air outlet of the charge air, a plurality of damping elements and connecting webs extending from the first end wall to the second end wall in the interior of the housing, wherein the respective connecting webs are arranged between a radially outer side edge region of the damping elements and the jacket wall and thus extend in the axial direction.

The respective connecting webs adjoin the damping elements and for this purpose are preferably in an imaginary extension of the respective damping element. The connecting web width corresponds approximately to the thickness of the damping elements on their radially outer side edge region at the position where the connecting web adjoins the adjacent damping element. As a result, the flow channel is not adversely affected or the free inlet cross section of the filter silencer between two damping elements is not reduced. As a result, the number of connecting ribs attached between the damping elements and in particular their flow-influencing thickness can be reduced with the same or improved housing rigidity, which has an overall advantageous effect with regard to the flow losses in the muffler.

In a preferred embodiment of the invention it is provided that the number of connecting webs corresponds to the number of damping elements. It is further advantageous if the damping elements are designed as damping elements bent in relation to the radial direction, in particular sickle-shaped damping elements. This means that the damping elements run in an arc shape when viewed radially from the outside to the inside.

It is further advantageous if the damping elements project with their first radial edge section into openings formed in the first end wall of the housing, and preferably the damping elements with their second edge section opposite the first edge section into depressions or arcuate grooves of the second end wall are stored. A curved shape of the grooves, which corresponds to the cross-sectional shape of the damping element in the affected edge section, is particularly advantageous.

In a further advantageous embodiment, it is provided that one or more detachable covers or holding covers, which are in their assembled state, are introduced in the end wall (ie the front end side or front side) in an end wall-side receptacle (for example a correspondingly shaped recess) cover the openings in the front wall and preferably hold them in position.

After the axial insertion of the damping elements, one end wall of the muffler is closed by means of one or more of the said covers. The damping elements are pressed by the covers in the axial direction into the depressions or grooves on the opposite rear end wall.

The damping elements are formed from an absorber part and preferably two axially extending guide rails and two lateral perforated metal covers. The density of the absorber part is designed in such a way that, in addition to good acoustic adaptation to the frequency range to be damped, it presses the cover plates against the inside of the openings in the front end wall and against the guide rails, thus ensuring secure attachment.

In an advantageous embodiment, the radially inner guide rails extend from the second end wall to the first end wall (in the axial direction) and the damping elements each have their radially inner side edge area on the inner guide rails and their radially outer side edge area on the external guide rails are stored. The two axially extending side edge regions of the damping elements are advantageously designed as rounded regions or with a radius.

It is acoustically advantageous to provide a perforation for the radially inner guide rail (ideally a comparable or identical perforation or porosity, such as the side cover plates of the damping elements used, which extends over at least 65% of the total length. The unperforated side is here As a result, the absorber part is protected on the one hand, in particular in the event of pump surges of the compressor, and on the other hand the acoustic damping is hardly impaired.

Alternatively, it can be provided that the connecting webs each run in parallel next to a directly adjacent outer guide rail in such a way that this guide rail bears against the respective connecting web. It is further advantageous if the connecting web has an essentially curved or concave-shaped contour for the Engagement of the rounded side edge region of the damping elements has.

In a further preferred embodiment of the invention, it is provided that a circumferential ring web establishes a connection between the connecting webs themselves and with the housing ribs attached between the damping elements. The ring web is used for the flat support of the peripheral perforated plates to form the casing wall, which are fixed to the housing in addition to a conventional screw connection by means of tension belts. The circumferential ring web here forms a defined contact surface for a tension belt which is preferably arranged in the center.

Between the housing and the end walls, an insert made of, for example, fibrous felts or nonwovens is used for acoustic decoupling and for increasing the acoustic insulation. Alternatively, a heavy layer insulation mat (e.g. made of butyl) can be attached to the back. The structure described is particularly advantageous in that disassembly and assembly of the damping elements can also be carried out in a simple and inexpensive manner even when the engine and turbocharger are installed.

Other advantageous developments of the invention are characterized in the subclaims or are shown in more detail below together with the description of the preferred embodiment of the invention with reference to the figures.

• 1 ein Ausführungsbeispiel eines Ansaugschalldämpfers in einer perspektivischen Ansicht;
• 2 eine perspektivische Ansicht eines Teils des Ansaugschalldämpfers gemäß der Ausführung aus 1,
• 3 eine perspektivische Ansicht ähnlich der 2, jedoch ohne die montierten Dämpfungselemente,
• 4 eine perspektivische Detailansicht auf die Innenseite der hinteren Stirnwand mit teilweise montierten Dämpfungselementen,
• 5 eine perspektivische Ansicht auf den Ansaugschalldämpfer gemäß 1 mit teilweise entfernten Gehäusebauteilen und
• 6 eine perspektivische Ansicht ähnlich der 2 jedoch mit Blick auf die Innenseite der vorderen Stirnwand.

Show it:

• 1 an embodiment of an intake silencer in a perspective view;
• 2nd a perspective view of part of the intake silencer according to the embodiment 1 ,
• 3rd a perspective view similar to that 2nd , but without the installed damping elements,
• 4th a detailed perspective view of the inside of the rear end wall with partially mounted damping elements,
• 5 a perspective view of the intake silencer according to 1 with partially removed housing components and
• 6 a perspective view similar to that 2nd however with a view of the inside of the front bulkhead.

The invention is described below with reference to FIG 1 to 6 explained in more detail using an exemplary embodiment, wherein the same reference numerals in the figures indicate the same functional and / or structural features.

In the 1 is an embodiment of an intake silencer 1 shown in a perspective view.

The intake silencer 1 is with a cylindrical housing 10th with a first and second opposite end wall 20 , 30th and one between the end walls 20 , 30th extending air-permeable jacket wall 40 shown. On the front and rear end walls 20 , 30th are also each foot parts 90 .

The jacket wall is open in terms of flow and forms a main flow inlet E for the radial entry of charge air. In the area of the rear end wall 20 trained main flow outlet H for the axial air outlet of the charge air in the axial direction.

On the front bulkhead 30th are three removable covers 37 assembled. In the 5 is one of the covers 37 been removed.

The 2nd represents a perspective view of part of the intake silencer 1 according to the execution 1 with the front end wall 30th and the jacket wall 40 are removed.

Inside the case 10th is a variety of damping elements 50 intended. There are also connecting bridges 60 trained, extending from the rear bulkhead 20 towards the unmounted front bulkhead 30th extend. In the 3rd a partially sectioned view is shown in which the damping elements 50 have been removed from their mounting positions. As can be seen further, the connecting webs 60 between a radially outer side edge area 51 of the damping elements 50 and the jacket wall 40 arranged.

The damping elements 50 are curved in a crescent shape with respect to the radial direction R and protrude with their first edge section running in the radial direction R. 53 in recesses 21 in the back bulkhead 20 .

Furthermore, the damping elements 50 with its second, the first edge section 53 opposite edge section 54 in openings 31 the front bulkhead 30th stored. For mounting the damping elements 50 these are through the openings 31 in the front bulkhead 30th passed until it into the pocket-like depressions 21 protrude and be stored there. To the damping elements 50 secure in their assembled position, these are covered by the covers 37 , as in 5 shown, held.

Furthermore, the damping elements 50 of radially inner, essentially U-shaped curved guide rails 33 held, into which the end edge portion of the damping elements protrudes, so that they each have their radially inner side edge region 52 on the inner guide rails 33 are stored.

Furthermore, the damping elements 50 of guide rails which are arranged radially further out and are essentially bent in a U-shape 34 held, into which the outer end edge portion of the damping elements protrudes, so that each of these has its radially outer side edge region 51 on the outer guide rails 34 are stored.

In 4th it can also be seen that the radially outer guide rails 34 directly at the connecting bridges 60 in each case parallel to the radially outer side edge of the immediately adjacent damping element 50 run and the damping elements 50 at the respective connecting bridge 60 with the guide rails 34 issue.

In the view of the 2nd and 3rd are three connecting ribs 70 shown which is stabilizing between the rear and front end walls 20 , 30th run and between two damping elements 50 are arranged. These connecting ribs 70 have approximately the same curvature as the damping elements 50 . In addition, the outside is all around the connecting webs 60 around a ring bridge 80 attached to the connecting webs 60 stabilizing together.

The 6 shows a perspective view looking at the inside of the front end wall 30th .

The embodiment of the invention is not limited to the preferred exemplary embodiments specified above. Rather, a number of variants are conceivable which make use of the solution shown even in the case of fundamentally different types.

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 0574605 A1 [0002]
• DE 19514990 B4 [0004]
• EP 2386761 A2 [0005]

Claims (14)

Intake muffler (1) with a cylindrical housing (10), with a first and second opposite end wall (20, 30) and an air-permeable jacket wall (40) extending between the end walls (20, 30), which a main flow inlet (E) to forms radial entry of charge air and with a main flow outlet (H) formed in the region of an end wall (30) for the axial air outlet of the charge air, a plurality of damping elements (50) and connecting webs (60) from the second being located inside the housing (10) The end wall (20) extends to the first end wall (30), the respective connecting webs (60) being arranged between a radially outer side edge region (51) of the damping elements (50) and the jacket wall (40). Intake silencer (1) after Claim 1 , characterized in that the number of connecting webs (60) corresponds to the number of damping elements (50). Intake silencer (1) after Claim 1 or 2nd , characterized in that the damping elements (50) are designed as damping elements bent in relation to the radial direction (R), in particular sickle-shaped curved damping elements. Intake muffler (1) according to one of the preceding claims, characterized in that the damping elements (50) are mounted in their recesses (21) in the second end wall (20) with their first edge section (53) extending in the radial direction (R). Intake silencer (1) after Claim 4 , characterized in that the damping elements (50) project with their second edge section (54) opposite the first edge section (53) into openings (31) formed in the first end wall (30). Intake silencer (1) according to one of the preceding claims, characterized in that radially inner guide rails (33) extend from the first end wall (20) to the second end wall (30) and the damping elements (50) each have their radially inner side edge region ( 52) are mounted on the inner guide rails (33). Intake silencer (1) according to one of the preceding claims, characterized in that radially outer guide rails (34) extend from the second end wall (30) to the first end wall (20) and the damping elements (50) each have their radially outer side edge region (51) are mounted on the outer guide rails (34). Intake silencer (1) according to one of the preceding Claims 1 to 6 , characterized in that the connecting webs (60) each run parallel to the radially outer side edge of the immediately adjacent damping element (50). Intake silencer (1) according to one of the preceding Claims 1 to 4th and the Claim 7 , characterized in that the connecting webs (60) each run parallel so next to a directly adjacent outer guide rail (34). Intake silencer (1) according to one of the preceding claims, characterized in that a plurality of connecting ribs (70) run between the first and second end walls (20, 30), each of which is formed between two damping elements (50) and extends from radially inside to radially outside extend. Intake silencer (1) according to one of the preceding claims, characterized in that a circumferential ring web (80) connects the connecting webs (60). Intake silencer (1) according to one of the preceding Claims 4 to 11 , characterized in that one or more detachable covers (37) are introduced in the end wall (30) in a front wall-side receptacle, which covers the openings (21) in the end wall (30) in their assembled state. Intake silencer (1) after Claim 12 , characterized in that an insert made of, for example, fibrous felts or nonwovens is introduced between the covers (37) and the end wall (30). Intake silencer (1) after Claim 13 , characterized in that instead of the insert, a heavy layer mat or heavy layer film is attached to the rear of the covers (37).

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