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1. (WO2018162660) A DOUBLE-STAGE IMPELLER ARRANGEMENT FOR A DOUBLE-STAGE CENTRIFUGAL TURBO-COMPRESSOR

Pub. No.:    WO/2018/162660    International Application No.:    PCT/EP2018/055807
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Fri Mar 09 00:59:59 CET 2018
IPC: F04D 17/12
F04D 29/10
F04D 29/28
F04D 29/62
Applicants: ROBERT BOSCH GMBH
DANFOSS COMMERCIAL COMPRESSORS
Inventors: BONNEFOI, Patrice
COTE, Julien
MARTIGNAGO, Clément
ROSSON, Yves
VANDESTEENE, Stan
Title: A DOUBLE-STAGE IMPELLER ARRANGEMENT FOR A DOUBLE-STAGE CENTRIFUGAL TURBO-COMPRESSOR
Abstract:
The double-stage impeller arrangement (17) includes a first impeller (18) and a second impeller (19), each of the first and second impellers (18, 19) having a front-side (21, 22) and a back-side (25, 26), the first and second impellers (18, 19) being configured to be connected to a drive shaft (4) of the double-stage centrifugal turbo-compressor (2) and being arranged in a back-to-back configuration; a radial annular groove formed between the back-sides (25, 26) of the first and second impellers (18, 19); and an inter-stage sealing device provided between the first and second impellers (18, 19). The second impeller (19) is distinct and separated from the first impeller (18) so as to enable an adjustment of an axial distance between the back-sides (25, 26) of the first and second impellers (18, 19), and the inter-stage sealing device includes a one-piece sealing member (32) having an annular disc shape and being at least partially arranged within the radial annular groove.