Exhaust-gas turbocharger with silencer

Abstract

A turbocharger (1) having a turbine housing (2), a compressor housing (3) which has a compressor outlet (20), and a silencer (21) which is arranged on an end region (22) on the compressor outlet (20) and which has a silencer housing (23) in which an insert part (25) is arranged so as to form at least one buffer chamber (24) which is connected via at least one opening (26) to an air-guiding duct (27). The opening (26) has an edge (28) with a radially inner corner (29) which is designed so as not to have a sharp edge.

Claims

1. A turbocharger (1) having a turbine housing (2), a compressor housing (3) which has a compressor outlet (20), and a silencer (21) having an inflow end (22) and an outflow end, the inflow end (22) being arranged on the compressor outlet (20) and a silencer housing (23) in which an insert part (25) is arranged, the insert part (25) having a tubular base part (37) having a wall having a radially outer surface and a radially inner surface, the tubular base part arranged so as to form (a) with its radially outer surface at least one buffer chamber (24) between the silencer housing (23) and the tubular base part (37) and (b) with its radially inner surface an air-guiding duct (27) defining an air-guiding space within the tubular base part (37), wherein at least one opening (26) is formed through the wall of the tubular base part (37), communicating between the buffer chamber (24) and the air-guiding duct (27), the opening having an edge (28) with a radially inner corner (29), and wherein the radially inner corner (29) is not a sharp corner thereby reducing or eliminating tones generated at the at least one opening (26) as air flows by the silencer.

2. The turbocharger as claimed in claim 1, wherein the corner (29) is provided with a rounding (30).

3. The turbocharger as claimed in claim 1, wherein the corner (29) is provided with a bevel (31).

4. The turbocharger as claimed in claim 1, wherein the corner (29) is provided with an inwardly directed bulge (32).

5. The turbocharger as claimed in claim 1, wherein the silencer housing (23) has an end region (34), and a connecting piece (33) on the end region (34).

6. The turbocharger as claimed in claim 5, wherein a further insert part (35) is arranged in the connecting piece (33).

7. The turbocharger as claimed in claim 6, wherein the further insert part (35) is provided with slots (36).

8. The turbocharger as claimed in claim 1, wherein the silencer housing (23) is a plastic part.

9. A silencer (21) of a turbocharger (1), comprising an inflow end (22) and an outflow end, the inflow end (22) being arranged on a compressor outlet (20) and a silencer housing (23) in which an insert part (25) is arranged, the insert part (25) having a tubular base part (37) having a wall having a radially outer surface and a radially inner surface, the tubular base part arranged so as to form (a) with its radially outer surface at least one buffer chamber (24) between the silencer housing (23) and the tubular base part (37) and (b) with its radially inner surface an air-guiding duct (27) defining an air-guiding space within the tubular base part (37), wherein at least one opening (26) is formed through the wall of the tubular base part (37), communicating between the buffer chamber (24) and the air-guiding duct (27), the opening having an edge (28) with a radially inner corner (29), and wherein the radially inner corner (29) is not a sharp corner thereby reducing or eliminating tones generated at the at least one opening (26) as air flows by the silencer.

10. The silencer as claimed in claim 9, wherein the corner (29) is provided with a rounding (30).

11. The silencer as claimed in claim 9, wherein the corner (29) is provided with a bevel (31).

12. The silencer as claimed in claim 9, wherein the corner (29) is provided with an inwardly directed bulge (32).

13. The silencer as claimed in claim 9, wherein the silencer housing (23) has an end region (34), and a connecting piece (33) on the end region (34).

14. The silencer as claimed in claim 13, wherein a further insert part (35) is arranged in the connecting piece (33).

15. The silencer as claimed in claim 14, wherein the further insert part (35) is provided with slots (36).

16. The silencer as claimed in claim 9, wherein the silencer housing (23) is a plastic part.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) Further details, advantages and features of the present invention will emerge from the following description of exemplary embodiments on the basis of the drawing, in which:

(2) FIG. 1 shows a perspective illustration of an embodiment of a turbocharger according to the invention which can be provided with a silencer according to the invention:

(3) FIG. 2 shows a longitudinal section through a silencer according to the invention which can be combined with the turbocharger according to FIG. 1, and

(4) FIGS. 3-5 show detailed illustrations A-1 to A-3 of embodiments of a radially inner machined corner of an opening of the silencer according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

(5) FIG. 1 shows an embodiment of a turbocharger 1 according to the invention which has a turbine with a turbine housing 2 and has a compressor with a compressor housing 3. The compressor housing has a compressor outlet 20 to which can be attached a silencer which will be explained in detail below on the basis of the diagrammatic illustration of FIGS. 2 to 5.

(6) All the other components of the turbocharger 1 illustrated by way of example will not be described in detail below because they are not required for explaining the principles of the present invention. For the explanation of the reference symbols used in FIG. 1, however, reference is made to the list of reference symbols.

(7) FIG. 2 illustrates a longitudinal section through a silencer 21 according to the invention, which silencer has a silencer housing 23 provided with a first end region 22 which can be attached in a suitable manner, for example screwed, to the compressor outlet 20.

(8) Arranged in the silencer housing 23 is an insert part 25 which has a tubular base part 37 which is provided with a spacer 38, which in the example is in the shape of a disk, for forming a buffer chamber 24. The insert part 25 may be fixed in the silencer housing 23 by means of a suitable retaining device 39 with the interposition of a sealing ring 40. The base part 37 is provided at least with one opening, but generally with two or three openings 26, which connect an air-guiding duct 27 arranged in the base part 37 to the buffer chamber 24.

(9) The opening 26 has an edge 28 which is provided with a radially inner corner 29. The edge 28 also has a radially outer corner 29, wherein FIG. 2 shows that the radially inner corner 29 is to be understood to mean the corner which is arranged closer to the longitudinal central line L of the silencer housing 23 than the radially outer corner 29.

(10) As is also shown in FIG. 2, the silencer housing 23 in the example has an integrally formed inner pipe piece 41 which, together with an outer wall 43, forms a further buffer chamber 42.

(11) Furthermore, the silencer housing 23 is provided, on its other end region 34, with a connecting piece 33 in which, in the example, a further insert part 35 with slots is arranged, one of which slots is denoted, representatively for all of the slots, by the reference numeral 36. Said insert part 35 likewise serves as a silencer. A line to the charge-air cooler, if one is provided, or to the engine may be connected to the connecting piece 33.

(12) To be able to prevent the generation of disturbance noises by the silencer 21 itself, the radially inner corner 29 thereof is machined in order to eliminate a sharp-edged design. FIGS. 3 to 5 show alternatives of the detail denoted in FIG. 1 by the letter A.

(13) FIG. 3 shows a rounding 30 of the radially inner corner 29, which rounding is provided with a selectable radius R. As shown in FIG. 3, the rounding 30 in this example points outward.

(14) FIG. 4 shows, as a detail A-2, a bevel 31 of the radially inner corner 29.

(15) FIG. 5 shows the detail A-3, wherein in this case, an inwardly directed bulge 32 of the radially inner corner 29 is provided, which likewise has a selectable radius R.

(16) All of said designs can prevent the occurrence of disturbance noises, since the sharp edge of the radially inner corner 29 of the edge 28 is eliminated.

(17) In addition to the above written disclosure of the invention, reference is hereby made explicitly to the diagrammatic illustration thereof in FIGS. 1 to 5.

LIST OF REFERENCE SYMBOLS

(18) 1 Turbocharger/exhaust-gas turbocharger

(19) 2 Turbine housing/turbine

(20) 3 Compressor housing/compressor

(21) 4 Turbine wheel

(22) 5 Adjusting ring

(23) 6 Blade bearing ring

(24) 7 Guide blades

(25) 8 Blade shaft

(26) 9 Supply duct

(27) 10 Axial connecting piece

(28) 11 Actuating device

(29) 12 Control capsule

(30) 13 Free space for guide blades 7

(31) 14 Plunger element

(32) 15 Annular part of the turbine housing 2

(33) 16 Spacer/spacer cam

(34) 17 Compressor wheel

(35) 18 Guide grate/guide apparatus

(36) 19 Bearing housing

(37) 20 Compressor outlet

(38) 21 Silencer

(39) 22 First end region

(40) 23 Silencer housing

(41) 24 Buffer chamber/buffer volume

(42) 25 Insert part

(43) 26 Opening

(44) 27 Air-guiding duct

(45) 28 Edge

(46) 29 Radially inner corner

(47) 29 Radially outer corner

(48) 30 Rounding

(49) 31 Bevel

(50) 32 Bulge

(51) 33 Connecting piece

(52) 34 Second end region

(53) 35 Insert part

(54) 36 Slot

(55) 37 Base part

(56) 38 Spacer

(57) 39 Retaining device

(58) 40 Sealing ring

(59) 41 Pipe piece

(60) 42 Buffer chamber

(61) 43 Outer wall

(62) L Longitudinal central line of the silencer housing 23

(63) R Radius