ACOUSTIC COMPONENT AND AIR ROUTING LINE HAVING AN ACOUSTIC COMPONENT

Abstract

An acoustic component is provided with a flow channel for a fluid. The flow channel has an inlet pipe and an outlet pipe. A flow channel section is arranged between the inlet pipe and the outlet pipe, wherein the flow channel section has a silencer volume connected in the flow channel section via openings to the flow channel. A flow deflection device is arranged at least in the flow channel section with the silencer volume, wherein the flow deflection device deflects a flow of the fluid in the flow channel section with the silencer volume away from the openings. The openings in the flow channel section are arranged in a sheltered zone of the flow deflection device.

Claims

1. An acoustic component comprising: a flow channel comprising an inlet, an outlet, and a channel section arranged between the inlet and outlet; and a flow deflection device arranged in the channel section, the flow deflection device comprising a longitudinal stay, the longitudinal stay comprising an axially extending rib along an interior of the channel section of the flow channel.

2. The acoustic component according to claim 1, wherein the channel section comprises a chamber arranged along an exterior of the channel section of the flow channel, the chamber being in fluid communication with the interior of the channel section via at least one opening.

3. The acoustic component according to claim 2, wherein the chamber is configured as a resonator chamber.

4. The acoustic component according to claim 2, wherein the chamber defines a silencer volume.

5. The acoustic component according to claim 1, wherein the flow deflection device comprises a step.

6. The acoustic component according to claim 1, wherein the flow deflection device is configured to deflect a flow of air through the channel section away from the at least one opening.

7. The acoustic component according to claim 1, wherein the flow deflection device is arranged at a transition from the inlet into the channel section.

8. The acoustic component according to claim 1, wherein the transition comprises a change in diameter from the inlet into the channel section.

9. The acoustic component according to claim 1, wherein the outlet comprises a larger diameter than the channel section.

10. The acoustic component according to claim 1, wherein the channel section comprises a larger diameter than the inlet.

11. The acoustic component according to claim 5, wherein the step is sharp-edged.

12. The acoustic component according to claim 1, wherein the acoustic component is cylindrical in shape.

13. The acoustic component according to claim 5, wherein the step extends circumferentially about the flow channel.

14. The acoustic component according to claim 1, wherein the acoustic component comprises a second flow deflection device.

15. The acoustic component according to claim 14, wherein the acoustic component comprises a second channel section.

16. The acoustic component according to claim 15, wherein the second channel section begins with the second flow deflection device.

17. The acoustic component according to claim 15, wherein the acoustic component comprises a second chamber.

18. The acoustic component according to claim 17, wherein the second chamber is a smaller volume than the chamber.

19. The acoustic component according to claim 15, wherein the second channel section comprises a larger diameter than the channel section.

20. The acoustic component according to claim 14, wherein the longitudinal stay extends longitudinally from the flow deflection device to the second flow deflection device.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0037] Further advantages result from the following drawing description. In the drawings, embodiments of the invention are illustrated. The drawings, the description, and the claims contain numerous features in combination. A person of skill in the art will consider the features expediently also individually and combine them to meaningful further combinations.

[0038] FIG. 1 shows a longitudinal section along an axial direction of an acoustic component according to an embodiment of the invention.

[0039] FIG. 2 shows a plan view of the section plane II-II through the acoustic component of FIG. 1.

[0040] FIG. 3 shows a longitudinal section along an axial direction of an acoustic component according to a further embodiment of the invention.

[0041] FIG. 4 shows a plan view of the section plane IV-IV through the acoustic component of FIG. 3.

[0042] FIG. 5 shows a plan view of a section plane through an acoustic component according to a further embodiment of the invention.

[0043] FIG. 6 shows a plan view of a section plane through an acoustic component according to a further embodiment of the invention.

[0044] FIG. 7 shows a longitudinal section along an axial direction of an acoustic component according to a further embodiment of the invention.

[0045] FIG. 7A shows a detail view of the longitudinal section of an acoustic component according to FIG. 1 with an illustration of the flow course.

[0046] FIG. 8 shows schematically a charge air duct with an acoustic component according to an embodiment of the invention.

DETAILED DESCRIPTION

[0047] In the Figures, same or similar components are identified with same reference characters.

[0048] FIGS. 1 and 2 show an acoustic component 100, in particular a resonator, also referred to herein as a silencer, according to an embodiment of the invention. FIG. 1 shows a longitudinal section along a longitudinal axis 60 in axial direction of the acoustic component 100, and FIG. 2 shows a plan view of the section plane II-II through the acoustic component 100 of FIG. 1.

[0049] The acoustic component 100 comprises a flow channel 16 for a fluid, in particular air, that is surrounded, for example, by cylindrical walls 23.

[0050] Between an inlet pipe 10 and an outlet pipe 12 of the flow channel 16, a flow channel section 40 with a resonator chamber 20 having an air-filled open interior (as shown in FIG. 1), also referred to as a silencer volume 20, the silencer volume is connected in the flow channel section 40 via openings 22 to the flow channel 16. The silencer volume 20 is closed off outwardly by a cover 26 forming a radially outer wall of the resonator chamber 20.

[0051] The openings 22 are identified only partially with reference characters for reasons of clarity. The flow channel 16 extends through the inlet pipe 10, the flow channel section 40 with silencer volume 20, and the outlet pipe 12.

[0052] At the transition 30 of the inlet pipe 10 into the flow channel section 40 with the silencer volume 20, a flow deflection device 50 in the form of a step 52 is provided such that the diameter of the flow channel 16 is enlarged in the flow channel section 40 with the silencer volume 20.

[0053] The openings 22 are arranged in the flow channel section 40 in a sheltered zone of the flow deflection device 50 formed as a step 52. The step 52 is arranged so as to extend circumferentially about the flow channel 16. The flow deflection device 50 is neutral in relation to the intended damping behavior of the acoustic component, i.e., is configured to be substantially ineffective with respect to damping.

[0054] The flow deflection device 50 deflects locally a flow of the fluid in the flow channel section 40 with the silencer volume 20 at the transition 30 away from the openings 22 toward the center of the flow channel 16 so that the flow lifts off of the openings 22 and only at some axial distance away from the step 52 reaches again the wall of the flow channel 16 where no openings 22 are existing anymore. For this purpose, a step 52 embodied with a sharp edge is particularly beneficial.

[0055] The flow deflection device 50 is oriented outwardly in this embodiment. The openings 22 comprise therefore, compared to the wall of the inlet pipe 10, a larger distance to the longitudinal axis 60.

[0056] Optionally, the flow deflection device 50 can however also be oriented inwardly, for example, in the form of a circumferentially extending or interrupted stay.

[0057] The height of the step or the expansion of the diameter can be adapted to the boundary conditions of the flow through the acoustic component 100 in practical use.

[0058] The outlet pipe 12 comprises the same diameter as the flow channel section 40 with the silencer volume 20. Optionally, the outlet pipe 12 can comprise a larger diameter than the flow channel section 40 with the silencer volume 20. In principle, the outlet diameter can however also be smaller again than at the step. In this case, the component can be manufactured of two component groups. The effectiveness of the measure is however maintained.

[0059] FIGS. 3 and 4 illustrate an acoustic component 100 according to a further embodiment of the invention. FIG. 3 shows a longitudinal section along a longitudinal axis 60 in axial direction of the acoustic component 100, and FIG. 4 shows a plan view of the section plane IV-IV through the acoustic component 100 of FIG. 3. The configuration of the acoustic component 100 corresponds substantially to that of FIGS. 1 and 2, reference being had to their description for avoiding unnecessary repetitions.

[0060] In addition to the step 52 already described in connection with FIGS. 1 and 2 as a flow deflection device 50, the flow deflection device 50 comprises two diametrically oppositely positioned longitudinal stays 56 which project into the flow channel 16.

[0061] The longitudinal stays 56 extend in axial direction along the flow channel section 40 all the way to the outlet pipe 12 and cover in axial direction the axial extension of the openings 22 in the flow channel section 40 with the silencer volume 20. The longitudinal stays 56 enhance lifting off of the flow from the openings 22 in the flow channel section 40 with the silencer volume 20.

[0062] FIGS. 5 and 6 show variants of an acoustic component 100 with longitudinal stays 56.

[0063] FIG. 5 shows a plan view of a section plane through an acoustic component 100 with a step 52 and four longitudinal stays 56 distributed equidistantly at the circumference of the flow channel section 40 about the longitudinal axis 60. The step 52 is interrupted by the longitudinal stays 56.

[0064] The further embodiment of the acoustic component 100 corresponds to the embodiments of FIGS. 1 through 4. The flow channel 16 comprises a larger cross section in the flow channel section 40 than in the inlet pipe 10.

[0065] FIG. 6 shows a plan view of a section plane through an acoustic component 100 in which four longitudinal stays 56, but no step 52, are provided as flow deflection device 50. The further embodiment of the acoustic component 100 corresponds to the configurations in FIGS. 1 through 4. The flow channel 16 comprises in the flow channel section 40 a smaller cross section than in the inlet pipe 10. The longitudinal stays 56 are placed essentially onto the inner radius of the flow channel 16. The inlet pipe 10 and the outlet pipe 12 can comprise the same inner radius.

[0066] FIG. 7 shows a longitudinal section along an axial direction of an acoustic component 100 according to a further embodiment of the invention.

[0067] The acoustic component 100 comprises a flow channel 16 for a fluid, in particular air, that is surrounded, for example, by cylindrical walls.

[0068] Between an inlet pipe 10 and an outlet pipe 12 of the flow channel 16, a first flow channel section 40 with a silencer volume 20 is arranged that is connected in the flow channel section 40 via openings 22 to the flow channel 16 and on which a second flow channel section 44, only partially illustrated, with a silencer volume 24 is arranged that is connected also via openings 22 to the flow channel 16. The openings 22 are identified only partially with reference characters for reasons of clarity. The flow channel 16 extends through the inlet pipe 10, the flow channel section 40 with silencer volume 20, the flow channel section 44 with silencer volume 24, and the outlet pipe 12. The silencer volume 20 is closed off outwardly by a cover 26 and the silencer volume 24 by a cover 28.

[0069] At the transition 30 of the inlet pipe 10 into the flow channel section 40 with the silencer volume 20, a flow deflection device 50 in the form of a step 52 is provided such that the diameter of the flow channel 16 is enlarged in the flow channel section 40 with the silencer volume 20.

[0070] The openings 22 are arranged in the flow channel section 40 in a sheltered zone of the flow deflection device 50 embodied as a step 52. The step 52 is arranged so as to extend circumferentially about the flow channel 16. The flow deflection device 50 is neutral in relation to the intended damping behavior of the acoustic component, i.e, designed to be substantially ineffective with respect to damping.

[0071] At the transition 34 of the flow channel section 40 into the flow channel section 44 with the silencer volume 24, a flow deflection device 50 in the form of a step 54 is provided such that the diameter of the flow channel 16 is enlarged in the flow channel section 44 with the silencer volume 24.

[0072] The openings 22 are arranged in the flow channel sections 40, 44 in a sheltered zone of the flow deflection device 50 formed as step 52, 54. The steps 52, 54 are arranged so as to extend circumferentially about the flow channel 16. The flow deflection device 50 is embodied neutral in relation to the intended damping behavior of the acoustic component, i.e., designed to be substantially ineffective with respect to damping.

[0073] The flow deflection device 50 deflects locally a flow of the fluid in the flow channel sections 40, 44 with the damping volumes 20, 24 at the transitions 30, 34 away from the openings 22 toward the center of the flow channel 16 so that the flow is lifted off of the openings and only at some axial distance from the steps 52, 54 reaches the wall of the flow channel 16 again where no openings 22 are present anymore. For this purpose, a step 52, 54 embodied with a sharp edge is particularly beneficial.

[0074] The flow deflection device 50 is oriented outwardly in this embodiment. The openings 22 comprise accordingly a larger distance to the longitudinal axis 60 in comparison to the wall of the inlet pipe 10.

[0075] Optionally, the flow deflection device 50 can however also be oriented inwardly, for example, in the form of a stay extending circumferentially or interrupted about the flow channel 16.

[0076] The height of the step or the expansion of the diameter can be adapted to the boundary conditions of the flow through the acoustic component 100 in practical use.

[0077] The outlet pipe 12 comprises the same inner diameter as the flow channel section 44 with the silencer volume 24. Optionally, the outlet pipe 12 can comprise a larger inner diameter than the flow channel section 44 with the silencer volume 24.

[0078] The outer diameters of the covers 26, 28 of the flow channel sections 40, 44 comprises the same diameter.

[0079] FIG. 7A shows a detail of a longitudinal section along a longitudinal axis 60 of an acoustic component 100 according to FIG. 1. Between an inlet pipe 10 and an outlet pipe 12 of the flow channel 16, a flow channel section 40 with a silencer volume 20 is arranged that is connected in the flow channel section 40 via openings 22 to the flow channel 16.

[0080] At the transition 30 of the inlet pipe 10 into the flow channel section 40 with the silencer volume 20, a flow deflection device 50 in the form of a step 52 is provided such that the diameter of the flow channel 16 is enlarged in the flow channel section 40 with the silencer volume 20.

[0081] The openings 22 are arranged in the flow channel section 40 in a sheltered zone of the flow deflection device 50 embodied as a step 52.

[0082] The flow deflection device 50 effects a detachment of the core flow 45 from the wall surface of the flow channel 16 so that the core flow 45 flows remote from the openings 22 and only at a certain axial distance from the flow deflection device 50 contacts the wall of the flow channel 16 again where no openings 22 are existing anymore. This detachment of the flow at the flow deflection device 50, for example, by a step 52, has the result that the openings 22 in the flow channel section 40 are located outside of the core flow 45 and are not subjected to inflow. The openings 22 are arranged in the wake region 48 of the flow, also referred to as dead water region. The wake region 48 is delimited by the imaginary separation surface 47 from the core flow 45. In the wake region 48, individual swirls 46 may occur which however have no acoustic effect.

[0083] FIG. 8 shows schematically an air routing line 200 in the form of a charge air duct of an internal combustion engine with an acoustic component 100 according to the invention according to an embodiment of the invention. The acoustic component 100 is arranged at a clean air side of an air inlet that leads from a turbocharger 90 to the internal combustion engine. Advantageously, disturbing noises such as whistling tones can be avoided by means of the acoustic component 100, even at high flow rates of the air in the air routing line 200.

[0084] The acoustic component 100 can be positioned upstream in the low-pressure part as well as downstream of the turbocharger 90 in the high-pressure part of the air routing line.