US 12,448,977 B2
Regenerative multi-stage compressor
Antonio Mischiatti, Taglio di Po (IT)
Appl. No. 18/001,792
Filed by M Pumps Process Srl, Taglio di Po (IT)
PCT Filed Jun. 22, 2020, PCT No. PCT/IB2020/055860
§ 371(c)(1), (2) Date Dec. 14, 2022,
PCT Pub. No. WO2021/255508, PCT Pub. Date Dec. 23, 2021.
Claims priority of application No. 102020000014818 (IT), filed on Jun. 19, 2020.
Prior Publication US 2023/0235741 A1, Jul. 27, 2023
Int. Cl. F04D 23/00 (2006.01); F04B 53/06 (2006.01); F04D 5/00 (2006.01); F04D 25/02 (2006.01); F04D 25/06 (2006.01); F04D 29/02 (2006.01); F04D 29/054 (2006.01); F04D 29/08 (2006.01); F04D 29/26 (2006.01); F04D 29/28 (2006.01)
CPC F04D 23/008 (2013.01) [F04D 25/026 (2013.01); F04D 25/06 (2013.01); F04D 29/266 (2013.01); F04D 29/284 (2013.01); F04B 53/06 (2013.01); F04D 5/002 (2013.01); F04D 29/023 (2013.01); F04D 29/054 (2013.01); F04D 29/083 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A regenerative compressor, configured to work at pressures exceeding 50 bars, comprising:
a motor;
a magnetic drive coupling connected to said motor and configured to transmit a rotary motion to a drive shaft, said drive shaft being mechanically connected to said magnetic drive coupling;
a plurality of impellers, each of said impellers being mechanically connected, directly or indirectly, to said drive shaft, each of said impellers being of a peripheral impeller and comprising a disc equipped with a set of blades mounted on one or both of two sides of the disc; and
a plurality of stages, each stage comprising a shell having one of said impellers mounted therein, wherein each one of said impellers rotates in a peripheral annular duct obtained in said shell, and wherein said annular duct communicates on one side of the duct with a gas suction mouth, and ends adjacently to a delivery mouth,
wherein said drive shaft is supported by bearings in at least two supports,
wherein said plurality of impellers is mounted on said drive shaft in a space included between said at least two supports,
wherein said shaft comprises a plurality of projections, arranged between said plurality of impellers, the plurality of projections rotating against one or more sealing elements constrained between said shaft, at a level of said plurality of projections, and said shells, and
wherein said shaft is provided with an axial hole for passage of gas along said shaft.