[12] Patent
[11] Patent No.:GC0009248  
[45] Date of Publishing the Grant of the Patent: 31/Dec /2018                56/2018  
Number of the Decision to Grant the Patent:2018/140703
Date of the Decision to Grant the Patent:02/Dec/2018

[21] Application No.:GC 2013-25556

[22] Filing Date:9/10/2013

[30] Priority:

[33] State [32] Priority date [31] Priority No.

[72] Inventor: BERGAMINI, Lorenzo

[73] Owner: Nuovo Pignone Srl, Via Felice Matteucci 2, Florence 50127, Italy

[74] Agent: Abu-Gazaleh Intellectual Property L.L.C




Int. Cl.: F04D 1/06, 29/10 (2006.01)

[56] Cited Documents:

-US 20080213093 A1 (Guelich; johann) September 2008
-US 5797724 A (Liu; Wen Jie) August 1998
-US 6736597 B2 (Uehara; Hidekazu) May 2004
-US 20080272553 A1 (Shorya Awtar, Nikhil Kumar Verma) 6 November 2011
-JP 2003021096 A (Akitoshi Masuda) 24 January 2003
Examiner: Eng. Mohammad W. AlHoshan

[57] Abstract: A centrifugal pump is described, comprising: a casing; a rotary shaft arranged for rotation in the casing; a plurality of pump stages, each pump stage comprising an impeller secured on said rotary shaft and arranged for rotation in a respective im-peller chamber formed in the casing. The pump further comprises a plurality of sealing members for reducing leakage between a rotary component and a respec-tive stationary component. At least one of the sealing members comprises an ar-rangement of compliant plate members attached in facing relation at root ends to the respective stationary component and forming a sealing ring between the sta-tionary component and the respective rotary component. Moreover, at least some pump stages have a specific speed of 25 or less.
No. of claims: 13     No. of figures: 4


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