# US 10,119,411 B2 · Exhaust-gas turbocharger

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- Number: US 10,119,411 B2
- Document ID: US10119411B2
- Status: Granted
- Kind: B2
- Application number: 14/406,644
- Filed: 2013-06-20
- Published: 2015-06-25
- Granted: 2018-11-06
- Earliest claimed: 2012-06-25
- Assignees: BorgWarner Inc.
- Applicants: BorgWarner Inc.
- Inventors: Aleksandra Dimova; Thomas Lischer
- Web page: https://patentgrep.com/patent/US10119411B2

## CPC

- F01D 11/02: by non-contact sealings, e.g. of labyrinth type (for sealing space between rotor blade tips and stator F01D11/08)
- F02C 6/12: Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
- F04D 17/10: for compressing or evacuating
- F04D 25/024: {the driving means being assisted by a power recovery turbine}
- F04D 29/102: {especially adapted for elastic fluid pumps}
- F04D 29/162: {of a centrifugal flow wheel}
- F05D 2220/40: in turbochargers
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- 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)
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

An exhaust-gas turbocharger (1) comprising a housing (2), a turbine wheel (5) with blades (6), a compressor wheel (4) with blades (6), and a shaft (3) which is mounted in the housing (2) and which connects the turbine wheel (5) and compressor wheel (4), wherein, in a gap (7) between the housing (2) and at least one blade (6), a contactless labyrinth seal (8) is formed on the blade (6) and on the housing (2), wherein the labyrinth seal (8) comprises at least one combination of a groove (13) and a projection (14).

## Claims

### Claim 1

An exhaust-gas turbocharger (1) comprising:
a housing (2),
a turbine wheel (5) with blades (6) adapted for receiving air radially and discharging air axially,
a compressor wheel (4) with blades (6) adapted to drawing air in axially and discharging air radially, and
a shaft (3) which is mounted in the housing (2) and which connects the turbine wheel (5) and compressor wheel (4),
wherein,
in a gap (7) between the housing (2) and at least one blade (6), a contactless labyrinth seal (8) is formed on the blade (6) and on the housing (2), wherein the labyrinth seal (8) comprises at least one combination of a groove (13) and a projection (14).

### Claim 2 (depends on 1)

The exhaust-gas turbocharger as claimed in claim 1, wherein the labyrinth seal (8) comprises at least one groove (13) in the housing (2) and one projection (14), which projects into the groove (13), on the blade (6), and/or at least one groove (13) in the blade (6) and one projection (14), which projects into the groove (13), on the housing (2).

### Claim 3 (depends on 1)

The exhaust-gas turbocharger as claimed in claim 1, wherein the labyrinth seal (8) comprises multiple combinations of a groove (13) and a projection (14) on a blade (6).

### Claim 4 (depends on 1)

The exhaust-gas turbocharger as claimed in claim 1, wherein the groove (13) and/or the projection (14) is arranged at a blade tip (15) of the blade (6).

### Claim 5 (depends on 1)

The exhaust-gas turbocharger as claimed in claim 1, wherein the groove (13) and/or the projection (14) is arranged on each blade (6) of the compressor wheel (4) or turbine wheel (5).

### Claim 6 (depends on 1)

The exhaust-gas turbocharger as claimed in claim 1, wherein the groove (13) and/or the projection (14) is arranged in that half of the blade (6) of the compressor wheel (4) which faces toward a compressor outlet (9).

### Claim 7 (depends on 1)

The exhaust-gas turbocharger as claimed in claim 1, wherein the groove (13) and/or the projection (14) is arranged in that half of the blade (6) of the turbine wheel (5) which faces toward a turbine inlet (10).

### Claim 8 (depends on 1)

The exhaust-gas turbocharger as claimed in claim 1, wherein the groove (13) and/or the projection (14) is trapezoidal.

### Claim 9 (depends on 1)

The exhaust-gas turbocharger as claimed in claim 1, wherein the groove (13) and/or the projection (14) is arranged in the downstream half of the blade (6) of the compressor wheel (4).

### Claim 10 (depends on 1)

The exhaust-gas turbocharger as claimed in claim 1, wherein the groove (13) and/or the projection (14) is arranged in the upstream half of the blade (6) of the turbine wheel (5).