US 12,258,908 B2
Modular cabin blower system for aircraft
Richard G. Stretton, Ashby-de-la-Zouch (GB); and Richard Sharpe, Leek (GB)
Assigned to Rolls-Royce plc, London (GB)
Filed by ROLLS-ROYCE plc, London (GB)
Filed on Aug. 13, 2021, as Appl. No. 17/401,647.
Claims priority of application No. 2013514 (GB), filed on Aug. 28, 2020.
Prior Publication US 2022/0065171 A1, Mar. 3, 2022
Int. Cl. F02C 7/32 (2006.01); F02C 7/18 (2006.01); F02K 3/04 (2006.01)
CPC F02C 7/32 (2013.01) [F02C 7/18 (2013.01); F02C 7/185 (2013.01); F02K 3/04 (2013.01); F05D 2260/40311 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A gas turbine engine including:
an engine core including a compressor, a combustor, and a turbine, the compressor being connected to the turbine through a respective shaft;
an accessory gearbox arranged within an accessory gearbox casing that surrounds the accessory gearbox, a first axis passing through the accessory gearbox to define a first axial side of the accessory gearbox casing and a second axial side of the accessory gearbox casing opposite the first axial side; and
a cabin blower system adapted to be driven by the accessory gearbox and comprising:
an electric variator comprising a first electrical machine connected to a drive pad of the accessory gearbox by a first shaft arranged along the first axis, a second electrical machine connected to a second shaft arranged along a second axis, wherein the second shaft is arranged outside the accessory gearbox and does not pass through the accessory gearbox casing, and a power management system interconnecting the first and second electrical machines and controlling whether each of the first and second electrical machines operates as a motor or a generator;
a differential gearbox having a first input connected to the drive pad of the accessory gearbox to receive drive therefrom, a second input connected to the second shaft of the second electrical machine, and an output; and
a cabin blower comprising a cabin blower compressor driven by the output of the differential gearbox by a third shaft arranged along a third axis, wherein the third shaft passes all the way through the accessory gearbox casing from the first axial side to the second axial side, the cabin blower compressor comprising an air inlet and an air outlet;
wherein the cabin blower, the first electrical machine, the second electrical machine, and the differential gearbox are configured as modules, and
wherein the first and second electrical machines are arranged on the first axial side of the accessory gearbox casing and the cabin blower is arranged on the second axial side of the accessory gearbox casing opposite the first axial side.