US 12,129,795 B2
Air inlet duct for a nacelle of an aircraft propulsion assembly
Quentin Matthias Emmanuel Garnaud, Moissy-Cramayel (FR); Antoine Elie Hellegouarch, Moissy-Cramayel (FR); and Nicolas Joseph Sirvin, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 17/598,987
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR)
PCT Filed Mar. 19, 2020, PCT No. PCT/FR2020/050594
§ 371(c)(1), (2) Date Sep. 28, 2021,
PCT Pub. No. WO2020/201658, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 1903499 (FR), filed on Apr. 2, 2019.
Prior Publication US 2022/0177149 A1, Jun. 9, 2022
Int. Cl. F02C 7/057 (2006.01); B64D 33/02 (2006.01); F02C 7/042 (2006.01)
CPC F02C 7/057 (2013.01) [B64D 33/02 (2013.01); F02C 7/042 (2013.01); F05D 2260/50 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An air inlet duct for a nacelle of an aircraft propulsion assembly, said air inlet duct comprising:
an annular body,
an annular air inlet lip comprising two coaxial annular walls, respectively inner and outer, the inner annular wall defining a portion of an inner annular surface of the air inlet duct and the outer annular wall defining a portion of an outer annular surface of the air inlet duct,
a control system configured to move the annular air inlet lip in axial translation relative to said annular body, from a first position in which the annular air inlet lip is joined to said annular body to a second position in which the annular air inlet lip is axially spaced apart from said annular body, and
an annular row of grilles secured in translation with the annular air inlet lip and which are configured to be, in said first position, housed in said annular body, and, in said second position, extended from said annular body positioned to be traversed by an airflow entering the air inlet duct,
wherein the air inlet duct further comprises at least one guiding system of the annular air inlet lip in translation with respect to said annular body, which is of a rail and slide type, and the annular inlet lip is releasably attached to the annular body by at least one flange when the annular inlet lip is in the first position, and the at least one flange is located on the inner annular wall of the annular air inlet lip and an inner body wall of the annular body, or on the outer annular wall of the annular air inlet lip and an outer body of the annular body.