US 12,078,180 B2
Centrifugal compressor having a motor cooling passage
Tingcan Mi, Shanghai (CN); Kai Deng, Shanghai (CN); Lei Yu, Shanghai (CN); Guangyu Shen, Shanghai (CN); Fei Xie, Shanghai (CN); and Yuhui Kuang, Shanghai (CN)
Assigned to CARRIER CORPORATION, Palm Beach Gardens, FL (US)
Appl. No. 17/254,924
Filed by Carrier Corporation, Palm Beach Gardens, FL (US)
PCT Filed Sep. 10, 2020, PCT No. PCT/US2020/050089
§ 371(c)(1), (2) Date Dec. 22, 2020,
PCT Pub. No. WO2021/050655, PCT Pub. Date Mar. 18, 2021.
Claims priority of application No. 201910863342.9 (CN), filed on Sep. 12, 2019.
Prior Publication US 2022/0196299 A1, Jun. 23, 2022
Int. Cl. F04D 25/06 (2006.01); F04D 17/12 (2006.01); F04D 29/056 (2006.01); F04D 29/063 (2006.01); F04D 29/42 (2006.01); F04D 29/58 (2006.01); F25B 31/02 (2006.01); F25B 31/00 (2006.01)
CPC F04D 25/0606 (2013.01) [F04D 17/122 (2013.01); F04D 29/056 (2013.01); F04D 29/063 (2013.01); F04D 29/4206 (2013.01); F04D 29/584 (2013.01); F25B 31/026 (2013.01); F04D 29/5806 (2013.01); F25B 31/006 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A centrifugal compressor, comprising:
a shell, which has a fluid inlet and a fluid outlet, the fluid inlet being located at a top of the shell;
a motor assembly, which is arranged in the shell and comprises a stator and a rotor, the rotor comprising a vertically arranged rotor shaft, and the rotor shaft comprising a lower end and an upper end;
a centrifugal compression mechanism, an impeller of which is connected with the rotor shaft so as to be driven by the motor assembly, wherein the centrifugal compression mechanism is arranged downstream of the fluid inlet to receive fluid, compress and pressurize the fluid, and output the pressurized fluid in a direction away from the motor assembly; and
a guide member, which receives the pressurized fluid from the centrifugal compression mechanism, and which defines a flow passage alone or together with a part of the shell, wherein the flow passage is configured such that the pressurized fluid from the centrifugal compression mechanism passes through and cools the motor assembly and is discharged from the fluid outlet;
wherein the guide member has a first end connected to an output port of the centrifugal compression mechanism, a second end connected to the side wall of the shell, and a pipe body connected between the first end and the second end;
wherein the motor assembly comprises:
a motor housing;
the stator fixed on an inner side of the motor housing;
the rotor located radially inwardly of the stator, the rotor being capable of rotating relative to the stator when the motor assembly is energized;
a first bearing seat at a bottom of the motor housing and a first bearing therein;
an oil cup at a top of the motor housing; and
a second bearing bracket located above the oil cup and a second bearing therein.