KR20200094691A - Intake silencer for turbocharger - Google Patents

Abstract

The present invention relates to an intake muffler (1) having a cylindrical housing (10), comprising: a first end portion wall and a second end portion wall (20, 30) located on opposite sides from each other; an air-permeable outer wall (40) extended from between the end portion walls (20, 30) and forming a main flow inlet (E) for radial entry of charging air; and a main flow outlet (H) formed within the area of the end portion wall (30) for axial air advancement of the charging air. In particular, according to the intake muffler (1) of the present invention, in the inner space of the housing (10), a plurality of damping elements (50) and connecting webs (60) are extended from the second end portion wall (20) to the first end portion wall (30), whereas each connecting web (60) is aligned between a side edge area (51) of the damping elements (50) located on the outside in a radial direction and the outer wall (40). Therefore, the intake muffler can be manufactured in a cost-efficient manner.

Description

Intake silencer for turbochargers {INTAKE SILENCER FOR TURBOCHARGER}

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

Common filter silencers are known, for example, from EP 057 46 05 A1. Filter silencers of this type are used, for example, on the suction side of a compressor, which compresses combustion air and feeds it to an internal combustion engine. Such a compressor is driven by an exhaust gas turbine of an exhaust gas turbocharger.

In the process, undesirably high amplitude sound waves, which are emitted into the surrounding environment by the air intake duct, are produced. Typically, these sound waves are attenuated by a silencer. For this purpose, the atmosphere flows through the filter arranged around the silencer, into the interior space of the silencer, which is configured to have damping elements, subsequently flows past the damping elements, and deflected by the guide elements to the compressor wheel. And the sound waves are emitted against the air flow from the compressor wheel.

From DE 195 14 990 B4, filter silencers are known, which have to be confirmed, in that the described advantages are of the same type and consist only of two parts, namely damping plates and absorbing elements, only damping elements are used.

EP 2 386 761 A2 discloses a suction silencer with a cylindrical housing. The housing has tubular outer walls, which provide opposing circular end walls and main flow inlets for the main flow of the first medium, which extend between these end walls, and in the region of the end walls, A main flow outlet for the main flow of the first medium is formed. When the charge air flows through the intake silencer, a deflection from a substantially radial inlet flow to a substantially axial discharge flow occurs, to flow to a compressor connected downstream in the axial direction.

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

Normally, the housing stiffness does not satisfactorily address the shortcomings to the characteristic natural frequency and vibration behavior on the engine resulting from the design. Thus, component natural frequencies are often within the range of typical engine main excitation orders, with the result that the intake silencer is exposed to high dynamic loads. In addition, there are increasing cases where reference values for mechanical vibration of engine components are exceeded around large engines.

In addition, when improving the housing stiffness, it is desirable to achieve a major function, namely adequate acoustic damping and as low a suction pressure loss as possible, without adversely affecting and achieving weight reduction.

Additionally, accessibility to individual parts, especially to damping elements, is in a way that disassembly as required for service purposes, for example, is not completely possible in the state as installed in or on the engine, Inadequately eliminated in suction silencers known from the prior art.

Starting from this, the present invention is based on the object of creating a new type of intake silencer and a turbocharger equipped with such an intake silencer, which overcomes the above-mentioned disadvantages and is capable of cost-effective production.

This object is solved through a combination of features according to claim 1.

The basic idea of the invention is that the inventive concept is provided in the end walls for this purpose, axially radially outward, ie in the direction of the rotor axis of the turbocharger, extending into the openings or recesses It is achieved by providing an easily mountable arrangement of damping elements of the silencer, which slides in the direction. For this purpose, the housing has, on one end wall, a plurality of suitably shaped openings, wherein the cross-sectional contours are formed to preferentially correspond to the cross-sectional contours of the damping elements, and the flow passages, each of 2 Each between two directly adjacent damping elements. Disassembly/assembly of the damping elements can occur very easily by removing covers that are ideally composed of a plurality of parts, without disassembling the circumferential perforated plate located on the outer wall and the filter mat that is typically attached. .

According to the present invention, for this purpose, a first end wall and a second end wall (front end wall and rear end wall) which are located opposite to each other, and extending between the end walls, radially entering the filling air A suction silencer having a cylindrical housing, having an air-permeable outer wall forming a main flow inlet for, and a main flow outlet formed in an area of an end wall for axial air entry of charged air, Within the interior space of the housing, a plurality of damping elements and connecting webs extend from the first end wall to the second end wall, and the individual connecting webs are lateral edge regions of the damping elements located radially outward. And a silencer, which is arranged between the outer wall and extends axially accordingly.

The individual connecting webs are adjacent to the damping elements and, for this purpose, are preferably placed in a virtual extension of the individual damping element. Here, the connecting web width roughly corresponds to the thickness of the damping elements in their lateral edge zones, which are located radially outward in a position where the connecting web is adjacent to the adjacent damping element. For this reason, the flow passage is not adversely affected, and more specifically, the free entry section of the filter silencer between the two damping elements is not reduced. Because of this, the number of connecting ribs attached between the damping elements and in particular the flow-influencing thickness of the connecting ribs can be reduced, with the same or improved housing stiffness, which are all combined silencers It has an advantageous effect in terms of flow loss at.

In a preferred configuration of the invention, the number of connecting webs corresponds to the number of damping elements. It is also advantageous when the damping elements are formed as damping elements bent against the radial direction, in particular as crescent-shaped bent damping elements. This means that when viewed from the radially outer side to the radially inner side, the damping elements extend in a crescent shape.

In addition, when the damping elements protrude into openings formed in the first end wall of the housing, by their first edge portion extending in the radial direction, and preferentially, the damping elements are located opposite the first portion It is advantageous when mounted in the arc-shaped grooves or recesses of the second end wall, by means of their second edge portion. The curved shape of the grooves, which corresponds to the cross-sectional shape at the associated edge portion of the damping elements, is particularly advantageous.

In another advantageous configuration, in the end wall (i.e., the front end face or the front side) in the end wall-side mounts (e.g., suitably shaped recesses), cover their openings in the end wall in their mounted state and preferably One or more removable covers or restraint lids are introduced, which retain the openings in the end walls in their position.

After the damping elements slide axially inward, one end wall of the silencer is closed by one or more of the covers. In the process, the damping elements are pressed into the recesses or grooves on the rear end wall, which are axially opposite, by the covers.

The damping elements are formed of absorber parts and, first of all, two axially extending guide rails and two lateral perforated plate covers. The absorber part, in terms of its density, in addition to good acoustical suitability for the frequency range to be attenuated, ensures that the absorber part presses the cover plates into the openings in the front end wall and against the guide rails and thereby It is configured to ensure adhesion.

In an advantageous configuration, the individual guide rails, which are located inside the radial direction, extend (axially) from the second end wall to the first end wall, and their lateral sides where the damping elements are respectively located inside the radial direction. It is provided that, by the edge zone, it is mounted on the guide rails which are located inside, and by their lateral edge zone which is located radially outside, on the guide rails which are located outside. Advantageously, the two axially extending lateral edge zones of the damping elements are configured as zones which are round or provided to have a radius.

For individual guide rails located radially inward, perforation extending over at least 65% of the total length (ideally, perforation or porosity comparable or equal to the lateral cover plates of the damping elements used) It is acoustically advantageous to provide. The side that is not perforated and remains, in this case, is directed to the compressor. Because of this, the absorber part is protected, on the one hand, especially when pumping surges of the compressor occur, and on the other hand, acoustic attenuation is hardly weakened.

Alternatively, it may be provided that the connecting webs, in each case, extend in parallel next to the immediately adjacent guide rails, which are each located outside, so that these guide rails lie against the individual connecting webs. It is also advantageous when the connecting web has a substantially curved or concave shaped contour for engagement of the damping elements formed in a round shape to the lateral edge region.

In another preferred configuration of the invention, it is provided that the circumferential annular web creates an interconnection between the connecting webs and suitable for housing ribs attached between the damping elements. The annular web, which is fixed on the housing by clamping straps in addition to the conventional screw connection, serves as a planar support of circumferential perforated plates for forming the outer wall. Here, the circumferential annular web forms a defined support surface, preferentially for a clamping strap arranged in the middle.

Between the housing and the end walls, an insert of fibrous felt or fleece, for example, serves for acoustic decoupling and to increase acoustic attenuation. Alternatively, a heavy layer of damping mat (eg composed of butyl rubber) is attached to the backs of the covers. The described structure is particularly advantageous in connection with the fact that the disassembly and assembly of the damping elements can also be carried out in a simple and cost effective manner with or without being installed in or on the engine and turbocharger.

Other advantageous further refinements of the invention are shown in the dependent claims or illustrated in more detail below by the drawings, together with a description of the preferred embodiment of the invention.

In the drawing:
1 shows a perspective view of an exemplary embodiment of a suction silencer;
2 is a perspective view of a portion of the suction silencer according to the embodiment from FIG. 1;
3 is a perspective view, similar to FIG. 2, but without accompanying damping elements;
4 is a detailed perspective view of the inside of the rear end wall with partially mounted damping elements;
5 is a perspective view of the intake silencer according to FIG. 1 with partially removed housing components; And
FIG. 6 is a perspective view similar to FIG. 2, but accompanied by a view to the inside of the front end wall.

In the following, the invention is explained in more detail by way of an exemplary embodiment with reference to FIGS. 1 to 6, wherein the same reference signs indicate the same functional and/or structural features in the figures.

1, an exemplary embodiment of the suction silencer 1 is shown in perspective.

The suction silencer 1 has first and second end walls 20, 30 which are located opposite to each other and an air-permeable outer wall 40 extending between the end walls 20, 30. , Having a cylindrical housing 10, is shown. In addition, foot portions 90 are positioned on the front end wall and the rear end wall 20, 30, respectively.

The outer wall opens on the side of the flow and forms the main flow inlet E for radial entry of the filling air. At the rear, i.e. at the rear end wall 20, in the main flow outlet (H) region formed, axial air advancement of axially charged air takes place.

On the front end wall 30, three removable covers 37 are mounted. In Fig. 5, one of the covers 37 is removed.

2 presents a perspective view of a portion of the suction silencer 1 according to the embodiment from FIG. 1, with the front end wall 30 and the outer wall 40 removed.

In the interior space of the housing 10, a plurality of damping elements 50 are provided. In addition, connecting webs 60 are formed, extending from the rear end wall 20 in a direction towards an unmounted front end wall 30. In FIG. 3, a partial cross-sectional view is shown, with the damping elements 50 removed from their mounting position. In addition, as is evident, the connecting webs 60 are arranged between the lateral edge region 51 and the outer wall 40 of the damping elements 50 which are located radially outward.

For the radial direction R, the damping elements are bent in a crescent shape, and by their first edge portion 53 extending in the radial direction R, recesses 21 in the rear end wall 20 ).

Furthermore, the damping elements 50 are mounted in the openings 31 of the front end wall 30 by their second edge portion 54 which is located opposite the first edge portion 53. To mount the damping elements 50, the damping elements penetrate the openings 31 in the front end wall 30 until the damping elements project into the pocket recesses 21 and are mounted there. . To secure the damping elements 50 in their mounting position, they are held by the covers 37, as shown in FIG. 5.

In addition, the damping elements 50 are held by guide rails 33, which are substantially bent in a U-shape and arranged radially inside, into these guide rails, the end-side of the damping elements By means of the lateral edge regions 52 of the damping elements whose edge portions protrude and are located radially inside, the damping elements are each mounted on guide rails 33 which are located inside.

Further, the damping elements 50 are held by the guide rails 34, which are substantially bent in a U-shape and arranged further outward in the radial direction, and are located outwardly into these guide rails. By means of the lateral edge zone 51 of the damping elements, where the bent-side edge portions of the damping elements are projecting, and thus located radially outward, the damping elements are respectively guide rails 34 located outward. It is mounted on. Further, in FIG. 4, the guide rails 34 which are located radially outward, are directly on the connecting webs 60, ie to the lateral edge of the immediately adjacent damping element 50 which is located radially outward. It is evident that the damping elements 50 are placed against the individual connecting web 60 together with the guide rails 34, each extending parallel and in parallel.

2 and 3, there are three connecting ribs 70 extending between the rear end wall and the front end walls 20, 30 in a stabilized manner and arranged between two damping elements 50, respectively. , Is shown. These connecting ribs 70 have approximately the same curvature as the damping elements 50. In addition to this, an annular web 80, which stably interconnects the connecting webs 60, is provided circumferentially on the outside round with respect to the connecting webs 60.

6 shows a perspective view of the inside of the front end wall 30.

In the embodiments of the present invention, the present invention is not limited to the preferred exemplary embodiments described above. In contrast, multiple versions can be considered, using the solutions shown, even with embodiments that are basically of different types.

Claims (14)

The first end wall and the second end wall (30, 20) which are located opposite to each other, and extending between the end walls (20, 30), the main flow inlet (E) for radial entry of the filling air Cylindrical housing (10), with an air-permeable outer wall (40) forming, and with a main flow outlet (H) formed in the zone of the end wall (20) for axial air entry of the filling air As a suction silencer (1) having,
Within the interior space of the housing 10, a plurality of damping elements 50 as well as connecting webs 60 extend from the second end wall 20 to the first end wall 30, individually The connecting webs 60 are arranged between the outer wall 40 and the lateral edge zone 51 of the damping elements 50 located radially outward. According to claim 1,
The number of connecting webs (60), the suction silencer, characterized in that corresponding to the number of the damping elements (50). The method according to claim 1 or 2,
The damping elements (50) are suction dampers, characterized in that they are formed as damping elements that are bent relative to the radial direction (R), in particular, as damping elements that are bent in a crescent shape. The method according to any one of claims 1 to 3,
The damping elements 50 are mounted in recesses 21 in the second end wall 20 by their first edge portions 53 extending in the radial direction R. Suction silencer. The method of claim 4,
The attenuation elements 50 are into openings 31 formed in the first end wall 30 by their second edge portion 54 which is located opposite the first edge portion 53. Suction silencer characterized in that it protrudes. The method according to any one of claims 1 to 5,
Guide rails 33 located radially inside extend from the first end wall 30 to the second end wall 20, and the damping elements 50 are each radially inner Inlet silencer, characterized in that mounted on the guide rails (33), which are located inside, by their lateral edge zones (52). The method according to any one of claims 1 to 6,
Guide rails 34 positioned radially outward extend from the second end wall 20 to the first end wall 30, and the damping elements 50 are each radially outward Inlet silencer, characterized in that mounted on the guide rails (34) which are located on the outside, by their lateral edge zone (51) located on. The method according to any one of claims 1 to 6,
Each of the connecting webs 60 extends in parallel to a lateral edge that is located outside the immediately adjacent damping element 50. The method according to any one of claims 1 to 4,
Each of the connecting webs 60 is, accordingly, a suction silencer, characterized in that it extends in parallel next to the immediately adjacent guide rail 34 which is located on the outside. The method according to any one of claims 1 to 9,
A plurality of connecting ribs 70, each formed between two damping elements 50 and extending radially outward from radially outward, between the first end wall and the second end wall 30, 20 Suction silencer, characterized in that extended from. The method according to any one of claims 1 to 10,
A circumferential annular web (80) connects the connecting webs (60). The method according to any one of claims 4 to 11,
It is characterized in that in the end wall-side mounting in the end wall 30, one or more removable covers 37 are introduced, which in their mounted state cover openings 31 in the end wall 30. Suction silencer. The method of claim 12,
Between the covers 37 and the end wall 30, for example, an insert of a fibrous felt or fleece is introduced, a suction silencer. The method of claim 13,
A suction silencer, characterized in that instead of the insert, a heavy layer of mat or a heavy layer of film is attached to the back of the covers 37.

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