US 12,410,802 B2
Multi-stage electric centrifugal compressor
Naomichi Shibata, Sagamihara (JP); Byeongil An, Sagamihara (JP); and Takaaki Yoshizawa, Sagamihara (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD., Sagamihara (JP)
Appl. No. 18/001,666
Filed by MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD., Sagamihara (JP)
PCT Filed Jul. 15, 2020, PCT No. PCT/JP2020/027555
§ 371(c)(1), (2) Date Dec. 13, 2022,
PCT Pub. No. WO2022/013985, PCT Pub. Date Jan. 20, 2022.
Prior Publication US 2023/0332607 A1, Oct. 19, 2023
Int. Cl. F04D 25/06 (2006.01); F04D 17/12 (2006.01); F04D 29/056 (2006.01); F04D 29/42 (2006.01); F04D 29/44 (2006.01); F04D 29/58 (2006.01)
CPC F04D 25/06 (2013.01) [F04D 29/056 (2013.01); F04D 29/4213 (2013.01); F04D 29/5826 (2013.01); F04D 17/125 (2013.01); F04D 29/444 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A multi-stage electric centrifugal compressor, comprising:
a rotational shaft;
a low-pressure-stage impeller disposed at one end of the rotational shaft;
a high-pressure-stage impeller disposed at another end of the rotational shaft;
a high-pressure-stage housing accommodating the high-pressure-stage impeller;
an electric motor configured to drive the low-pressure-stage impeller and the high-pressure-stage impeller; and
a connecting pipe for supplying a compressed gas compressed by the low-pressure-stage impeller to the high-pressure-stage housing,
wherein the high-pressure-stage housing has a high-pressure-stage inlet opening that opens in a first direction intersecting an axis of the rotational shaft,
wherein the connecting pipe includes a high-pressure-stage-side connection portion connected to the high-pressure-stage inlet opening, and
wherein a flow path cross-section perpendicular to an extending direction of an axis of the high-pressure-stage-side connection portion has a longitudinal direction along a direction perpendicular to the axis of the rotational shaft, and includes concavely curved portions formed at both ends in the longitudinal direction of the flow path cross-section of the high-pressure-stage-side connection portion.