Silencer

Patent metadata

Field	Value
Publication number	US-9605631-B2
Application number	US-201414910682-A
Country	US
Kind code	B2
Filing date	Aug 7, 2014
Priority date	Aug 8, 2013
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A silencer, for example an intake silencer for an internal combustion engine, may include a pipe for conducting a gas mixture. The pipe may be perforated at least in some regions. An absorption layer may at least partially surround the pipe for absorbing a sound transmitted by the gas mixture. An outer casing may encase the pipe. The outer casing may be perforated at least in some regions and may surround the absorption layer.

First claim

The invention claimed is:

1. A production method for a silencer, comprising:
providing a pipe having a perforated region and a perforated connection region;
providing a first half shell and a second half shell, wherein at least one of the first half shell and the second half shell has a perforated region;
disposing a hollow connecting element on the first half shell to provide a fluidic connector for communicating fluid in the pipe, the hollow connecting element having an axis extending through the perforated connection region
pressing a porous sound-absorbing material between the pipe and at least one of the first half shell and the second half shell to form an absorption layer sandwiched between the perforated region of the pipe and the perforated region of the at least one of the first half shell and the second half shell;
joining the first half shell and the second half shell together to form an outer casing enclosing the pipe and surrounding the absorption layer;
wherein the perforated connection region defines a fluidic connection between the pipe and the hollow connecting element.

2. The method according to claim 1 , wherein providing the pipe includes disposing a configuration of perforation holes in the perforated region and another configuration of perforation holes in the perforated connection region, the other configuration of perforation holes in the perforated connection region structured differently than the configuration of perforation holes in the perforated region to facilitate fluid communication between the hollow connecting element and the pipe.

3. A silencer, comprising:
a pipe having an axis for conducting a gas mixture, wherein the pipe is perforated with a plurality of perforation holes in at least one region;
an absorption layer at least partially surrounding the pipe for absorbing a sound transmitted by the gas mixture;
an outer casing at least partially encasing the pipe, wherein the outer casing is perforated with a plurality of perforation holes in at least one region and the outer casing surrounds the absorption layer; and
a fluidic connector to provide a fluid coupling for the pipe, wherein the fluidic connector includes at least one hollow connecting element disposed on the pipe and in fluid communication with the gas mixture.

4. The silencer according to claim 3 , wherein the pipe has at least one perforated connection region defining a fluidic connection between the pipe and the at least one hollow connecting element, and wherein the at least one perforated connection region includes a plurality of other perforation holes having a flow cross-section sized larger than that of the plurality of perforation holes in the at least one region of the pipe to facilitate a fluid flow through the at least one perforated connection region.

5. The silencer according to claim 3 , wherein the plurality of perforation holes of the pipe and the plurality of perforation holes of the outer casing are arranged partially offset to one another in a radial direction of the pipe.

6. The silencer according to claim 3 , wherein the absorption layer is composed of a material capable of substantially completely absorbing the sound in a high frequency range.

7. The silencer according to claim 3 , wherein the pipe is perforated in a configuration facilitating a change in a buildup of resonant frequencies and a reduction of an outlet sound in low frequency ranges, and wherein the configuration includes at least one of:
a uniform distribution of the plurality of perforation holes disposed in the pipe;
the plurality of perforation holes disposed in the pipe have a round shape; and
at least two of the plurality of perforation holes disposed in the pipe have the same shape.

8. The silencer according to claim 3 , further comprising an acoustic resonator coupled to the at least one connecting element for influencing the sound transmitted by the gas mixture, wherein the acoustic resonator is arranged transverse to a flow direction of the gas mixture in the pipe and spaced apart from the pipe and the outer casing.

9. The silencer according to claim 3 , wherein the at least one connecting element has a hollow-cylindrical structure and projects radially from the pipe.

10. The silencer according to claim 9 , wherein the at least one connecting element has an axis that extends substantially perpendicular to a flow direction of the gas mixture in the pipe.

11. The silencer according to claim 9 , wherein the at least one connecting element is a first connecting element, and wherein the fluidic connector further includes a hollow-cylindrical second connecting element in fluid communication with the gas mixture and arranged axially parallel to the first connecting element.

12. The silencer according to claim 11 , wherein the first connecting element and the second connecting element are arranged spaced apart transverse to a flow direction of the gas mixture in the pipe.

13. The silencer according to claim 11 , wherein the pipe has a first connecting region fluidically connected to the first connecting element and a second connecting region fluidically connected to the second connecting element.

14. The silencer according to claim 13 , wherein at least one of the first connecting region and the second connecting region is perforated with a plurality of other perforation holes.

15. The silencer according to claim 14 , wherein the plurality of other perforation holes of the at least one of the first connecting region and the second connecting region are structured differently from the plurality of perforation holes disposed in the at least one region of the pipe.

16. The silencer according to claim 14 , wherein the at least one of the first connecting region and the second connection region is arranged in a bent section of the pipe to facilitate a flow of the gas mixture therethrough.

17. The silencer according to claim 15 , wherein the plurality of other perforation holes are different in at least one of number, density and size than the plurality of perforation holes disposed in the at least one region of the pipe.

18. A silencer for an engine intake, comprising:
a pipe for conducting a fluid flow, the pipe having at least one perforated region including a plurality of perforation holes;
an absorption layer at least partially surrounding the pipe in the at least one perforated region for absorbing a sound transmitted by the fluid flow, the absorption layer composed of a porous sound-absorbing material;
an outer casing at least partially encasing the pipe and surrounding the absorption layer, the outer casing having at least one perforated region including a plurality of perforation holes;
wherein the absorption layer is sandwiched between the at least one perforated region of the pipe and the at least one perforated region of the outer casing; and
wherein the pipe has at least one perforated connection region to provide a fluidic connection for the pipe, the at least one perforated connection region including a plurality of other perforation holes structured differently from the plurality of perforation holes of the at least one perforated region of the pipe.

19. The silencer according to claim 18 , further comprising a fluidic connector to provide a fluid coupling for the pipe, wherein the fluidic connector includes at least one hollow connecting element fluidly connected to the at least one perforated connection region, the at least one perforated connection region defining the fluidic connection between the pipe and the at least one hol

Assignees

• Mahle Int Gmbh

Inventors

• Zirkelbach Thomas

Classifications

• F02M35/1283

  Manufacturing or assembly; Connectors; Fixations · CPC title

• F02M35/10

  Air intakes; Induction systems · CPC title

• F02M35/1261

  Helmholtz resonators · CPC title

• F02M35/10111

  Substantially V-, C- or U-shaped ducts in direction of the flow path · CPC title

• F02M35/1216 Primary

  by using a plurality of holes, slits, protrusions, perforations, ribs or the like; Surface structures; Turbulence generators · CPC title