# US 2016/0258447 A1 · Noise attenuation device for compressor inlet duct

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- Number: US 2016/0258447 A1
- Document ID: US20160258447A1
- Status: Published application
- Kind: A1
- Application number: 15/032,172
- Filed: 2014-10-30
- Published: 2016-09-08
- Earliest claimed: 2013-10-31
- Assignees: BorgWarner Inc.
- Applicants: Borgwarner Inc.
- Inventors: Andrew DAY; James MAWER; Andrew RICHARDSON; Sanjit CHAGGAR; Steve BIRNIE
- Web page: https://patentgrep.com/patent/US20160258447A1

## CPC

- F04D 29/663: {Sound attenuation}
- F01D 5/02: Blade-carrying members, e.g. rotors (rotors of non-bladed type F01D1/34; stators F01D9/00 {; selecting particular materials F01D5/28})
- F01D 25/24: Casings (modified for heating or cooling F01D25/14); Casing parts, e.g. diaphragms, casing fastenings (casings for rotary machines or engines in general F16M {; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045})
- F02B 33/40: of non-positive-displacement type
- F02B 37/00: Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02C 6/12: Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
- F02C 7/045: having provisions for noise suppression
- F04D 17/10: for compressing or evacuating
- F04D 25/045: {the pump wheel carrying the fluid driving means, e.g. turbine blades}
- F04D 29/284: {for compressors}
- F04D 29/4206: {especially adapted for elastic fluid pumps}
- F04D 29/4213: {suction ports}
- F04D 29/441: {especially adapted for elastic fluid pumps}
- F04D 29/665: {by means of resonance chambers or interference}
- F04D 29/685: {Inducing localised fluid recirculation in the stator-rotor interface}
- F05D 2220/40: in turbochargers
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

A turbocharger compressor noise attenuation device (60, 160) is formed separately from the air inlet (16) of the compressor housing (12). The device (60) includes a tapered inner surface (66) having a minimum diameter portion (62) that is axially spaced apart from a first end face (50), a maximum diameter portion (64) that is between the minimum diameter portion (62) an opposed second end (48), and an annular groove (72) formed in a working face (74) of the minimum diameter portion that is parallel to the first end face (50).

## Claims

### Claim 1

An air intake pipe (40) configured to connect a turbocharger compressor air inlet (16) to an air intake system of an engine, the air intake pipe (40) comprising;
an outer surface (42),
an inner surface (44);
a first end (46) configured to connect to the air intake system, and
a second end (48) opposed to the first end (46), the second end (48) including
an annular terminal end face (50) corresponding to the surface extending between the outer surface (42) and the inner surface (44), and
a tapered portion (60) protruding radially inward from the inner surface (44) and disposed adjacent to the terminal end face (50), the tapered portion including
a minimum diameter portion (62) that is axially spaced apart from the end face (50),
a maximum diameter portion (64) that is between the minimum diameter portion and the first end (46), and
an annular groove (72) formed in a working face (74) of the minimum diameter portion (62) that is parallel to the terminal end face (50), the groove (72) extending about a circumference of the inner surface (44).

### Claim 2 (depends on 1)

The air intake pipe (40) of claim 1, wherein the maximum diameter portion (64) has a diameter that is less than that of the inner surface (44), whereby a first shoulder (68) is defined at one end of the tapered portion (60).

### Claim 3 (depends on 1)

The air intake pipe (40) of claim 1, wherein
the maximum diameter portion (64) has a diameter that is less than that of the inner surface (44), whereby a first shoulder (68) is defined at one end of the tapered portion (60), the first shoulder facing the pipe first end (46), and
the minimum diameter portion (62) has a diameter (d3) that is less than that of the maximum diameter portion (64) whereby a second shoulder (70) corresponding to the working face (74) is defined at another end of the tapered portion, the second shoulder (70) facing the pipe second end (48) and having a larger radial dimension than the first shoulder (68).

### Claim 4 (depends on 1)

The air intake pipe (40) of claim 1, wherein the annular groove (72) is shaped and dimensioned to receive an end (17) of the air inlet (16) in a press fit relationship.

### Claim 5 (depends on 1)

The air intake pipe (40) of claim 1, wherein the minimum diameter of the tapered portion (60) is made to correspond to the minimum diameter of the turbocharger compressor air inlet (16).

### Claim 6

A noise attenuation device (160) configured to be inserted between an air intake pipe (140) and an air inlet (16) of a turbocharger compressor (3), the noise attenuation device (160) comprising
a hollow cylindrical body including
a tapered inner surface (166),
one end corresponding to a minimum diameter portion (162) of the tapered inner surface (166),
another end opposed to the one end and corresponding to a maximum diameter portion (164) of the tapered inner surface (166), and
an outer surface (165) that includes
an outwardly-protruding, circumferentially-extending first flange (180),
wherein the noise attenuation device (160) is configured to be disposed coaxially within the air inlet (16) in a manner such that the minimum diameter portion (162) is downstream with respect to direction of air flow through the air inlet (16) relative to the maximum diameter portion (164), and the first flange (180) engages a corresponding groove (154) formed on an inner surface of the air inlet (16) at a location spaced apart from an inlet end (17) of the air inlet (16), whereby the body is secured within the air inlet (16).

### Claim 7 (depends on 6)

The noise attenuation device (160) of claim 6, wherein the outer surface (158) further comprises a second flange (178) disposed at the another end corresponding to the maximum diameter portion (164), the second flange (178) protruding radially outward so as to define a shoulder (170) that is spaced apart from the another end, and having a radial dimension corresponding to the thickness of a terminal end (17) of the air inlet (16), such that when the insert is disposed the air inlet (16), the shoulder (170) abuts the terminal end (17) of the air inlet (16) and the first flange (180) resides within the groove (154).

### Claim 8 (depends on 6)

The noise attenuation device (160) of claim 6 wherein the noise attenuation device (160) is formed of an elastic material.

### Claim 9 (depends on 6)

The noise attenuation device (160) of claim 6 wherein the minimum diameter portion (162) has a diameter (d3′) that is less than the noise attenuation device outer diameter (d6), whereby a shoulder (182) is defined at the end corresponding to the minimum diameter portion (162) which serves as a noise reflecting surface.

### Claim 10 (depends on 9)

The noise attenuation device (160) of claim 9, wherein the shoulder (182) is configured so that when the noise attenuation device is inserted between an air intake pipe (140) and an air inlet (16) of a turbocharger compressor (3), the shoulder (182) defines a working face (174) that confronts an air vent passageway (20) formed in the air inlet (16).

### Claim 11

An exhaust gas turbocharger (1) comprising:
a turbine (2) including a turbine housing (11) and a turbine wheel (4) disposed in the turbine housing (11);
a compressor (3) including
a compressor housing (12) defining a cylindrical air inlet (16);
a compressor wheel (5) disposed within the compressor housing (12) adjacent to the air inlet (16), the compressor wheel (3) connected to the turbine wheel (4) via a shaft (6);
an air intake pipe (140) connected to the air inlet (16), the air intake pipe (140) comprising:
a first end (146);
a second end (148) opposed to the first end (146), the second end (148) connected to the air inlet (16);
a longitudinal axis (152) extending between the first end (146) and the second end (148); and
a noise attenuation device (160) protruding inward from, and extending circumferentially about, an inner surface (144) of the air intake pipe (140) adjacent the second end (148), wherein the noise attenuation device (160) is tapered along an axial direction of the air intake pipe (140) such that a minimum diameter portion (162) of the noise attenuation device (160) is disposed at the second end (148).

### Claim 12 (depends on 11)

The exhaust gas turbocharger of claim 11, wherein the noise attenuation device (160) includes a circumferential groove (72) that receives a terminal end of the air inlet (16).

### Claim 13 (depends on 12)

The exhaust gas turbocharger of claim 12 wherein the groove (72) opens facing the compressor wheel (5), and is shaped and dimensioned to receive an end of the air inlet (16) in a press fit relationship.

### Claim 14 (depends on 11)

The exhaust gas turbocharger of claim 11 wherein the noise attenuation device (160) is formed as an insert that is configured to be separable from, and received within, the air inlet (16), the insert comprising:
an outer surface (142) that includes an outwardly-protruding, circumferentially-extending first flange (180) that is configured to be received in a corresponding groove (154) formed on an inner surface of the air inlet (16), such that when the first flange (180) is engaged with the groove (154), the insert is secured within the air inlet (16).

### Claim 15 (depends on 14)

The exhaust gas turbocharger of claim 14, wherein the outer surface (142) of the insert further comprises a second flange (178) disposed at one end, the flange (178) protruding radially outward so as to define a shoulder that is spaced apart from the one end and has a radial dimension corresponding to the thickness of a terminal end (17) of the air inlet (16), such that when the insert is disposed the air inlet (16), the shoulder (178) abuts the terminal end of the air inlet (16) and the first flange (180) resides within the groove (154).