(19)
(11) EP 3 739 215 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
24.03.2021 Bulletin 2021/12

(43) Date of publication:
18.11.2020 Bulletin 2020/47

(21) Application number: 20170369.1

(22) Date of filing: 20.04.2020
(51) International Patent Classification (IPC): 
F04D 17/12(2006.01)
F04D 25/16(2006.01)
F04D 29/10(2006.01)
 F04D 25/06(2006.01)
F04D 29/051(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(71) Applicant: Sulzer Management AG
8401 Winterthur (CH)

(72) Inventors:
  • DE RAEVE, Karel
    8400 Winterthur (CH)
  • GASSMANN, Simon
    8051 Zürich (CH)
  • WELSCHINGER, Thomas
    78315 Radolfzell (DE)
  • TROTTMANN, Benedikt
    9000 St. Gallen (CH)

(74) Representative: Intellectual Property Services GmbH 
Langfeldstrasse 88
8500 Frauenfeld
8500 Frauenfeld (CH)

   


(54) PROCESS FLUID LUBRICATED PUMP


(57) A process fluid lubricated pump is proposed, for conveying a process fluid, having a common housing (2), a pump unit (3) arranged in the common housing, and a drive unit (4) arranged in the common housing (2), wherein the common housing (2) comprises an inlet (21) and an outlet (22) for the process fluid, wherein the pump unit (3) comprises a pump shaft (5) extending from a drive end (51) to a non-drive end (52) of the pump shaft (5) and configured for rotating about an axial direction (A), the pump unit (3) further comprising at least a first stage impeller (31) fixedly mounted on the pump shaft (5), and a last stage impeller (33) fixedly mounted on the pump shaft (5), and optionally at least one intermediate stage impeller (32) fixedly mounted on the pump shaft (5) between the first stage impeller (31) and the last stage impeller (33) wherein the drive unit (4) is configured to exert a torque on the drive end (51) of the pump shaft (5) for driving the rotation of the pump shaft (5), wherein a balance drum (7) is fixedly connected to the pump shaft (5) between the pump unit (3) and the drive end (51) of the pump shaft (5), the balance drum (7) defining a drum front side (71) facing the pump unit (3) and a drum back side (72), wherein a relief passage (73) is provided between the balance drum (7) and a first stationary part (26) configured to be stationary with respect to the common housing (2), the relief passage (73) extending from the drum front side (71) to the drum back side (72), wherein the pump unit (3) comprises at most one radial pump bearing (54) for supporting the pump shaft (5), wherein the at most one radial pump bearing (54) is arranged at the non-drive end (52) or at the drive end (51) of the pump shaft (5).