US 11,808,283 B2
Turbocharger having adjustable-trim centrifugal compressor including air inlet wall having cavities for suppression of noise and flow fluctuations
Alain Lombard, Vosges (FR); Hani Mohtar, Lorraine (FR); Dominique Colombier, Vosges (FR); and Stephane Pees, Ceintrey Meurthe-et-Moselle (FR)
Assigned to Garrett Transportation I Inc., Torrance, CA (US)
Filed by Garrett Transportation I Inc., Torrance, CA (US)
Filed on Aug. 24, 2021, as Appl. No. 17/445,734.
Application 17/445,734 is a division of application No. 16/395,651, filed on Apr. 26, 2019, abandoned.
Prior Publication US 2021/0381528 A1, Dec. 9, 2021
Int. Cl. F04D 29/66 (2006.01); F01D 9/04 (2006.01); F01D 17/10 (2006.01); F02B 33/40 (2006.01)
CPC F04D 29/665 (2013.01) [F01D 9/04 (2013.01); F01D 17/10 (2013.01); F02B 33/40 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A turbocharger, comprising:
a turbine including a turbine housing;
a compressor assembly comprising a compressor housing and a compressor wheel mounted in the compressor housing and connected to a rotatable shaft for rotation therewith, the compressor wheel having blades and defining an inducer portion, the compressor housing comprising a first housing portion and a second housing portion, the first housing portion comprising an outer wall and an inlet wall formed as a unitary member, the outer wall being disposed radially outwardly of the inlet wall, the inlet wall circumscribing an air inlet for the compressor wheel, the second housing portion defining a tip shroud for the compressor wheel and defining a volute for receiving compressed air from the compressor wheel, the compressor housing upstream of the compressor wheel defining an annular space located radially outward of the air inlet, an axial extent of the annular space being bounded between a radially extending upstream wall which is part of the first housing portion and a radially extending downstream wall which is part of the second housing portion, a radially innermost extremity of the annular space being open to the air inlet;
an inlet-adjustment mechanism disposed in the annular space and adjustable between an open position and a closed position, the inlet-adjustment mechanism being movable radially inwardly from the annular space into the air inlet into the closed position so as to create an orifice having a reduced diameter relative to a nominal diameter of the air inlet; and
wherein the first housing portion defines a first quarter-wave resonator cavity wholly disposed between the outer wall and the inlet wall of the first housing portion, the first housing portion further defining a first opening in the radially extending upstream wall, the first opening leading into the first quarter-wave resonator cavity.