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1. EP2806169 - INDUCER

Office
European Patent Office
Application Number 13738762
Application Date 17.01.2013
Publication Number 2806169
Publication Date 26.11.2014
Publication Kind A4
IPC
F04D 29/22
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
04POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
DNON-POSITIVE-DISPLACEMENT PUMPS
29Details, component parts, or accessories
18Rotors
22specially for centrifugal pumps
CPC
F04D 29/2277
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
DNON-POSITIVE-DISPLACEMENT PUMPS
29Details, component parts, or accessories
18Rotors
22specially for centrifugal pumps
2261with special measures
2277for increasing NPSH or dealing with liquids near boiling-point
F01D 5/145
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
5Blades; Blade-carrying members
12Blades
14Form or construction
141Shape, i.e. outer, aerodynamic form
145Means for influencing boundary layers or secondary circulations
F04D 29/384
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
DNON-POSITIVE-DISPLACEMENT PUMPS
29Details, component parts, or accessories
26Rotors specially for elastic fluids
32for axial flow pumps
38Blades
384characterised by form
Applicants EBARA CORP
Inventors WATANABE HIROYOSHI
Designated States
Priority Data 2012008333 18.01.2012 JP
Title
(DE) INDUKTOR
(EN) INDUCER
(FR) INDUCTEUR
Abstract
(EN) The present invention relates to an inducer geometry which can optimize the behavior stability of cavitation in an inducer having a plurality of blades of the same geometry. In the inducer having a plurality of blades of the same geometry, a blade loading at a tip side in a front half of a blade is larger than that in a rear half of the blade; and when a blade angle from a circumferential direction of the inducer is expressed by ² b (degree) and a meridional distance is expressed by m (mm), an increase rate d² b /dm of the blade angle at the tip side is not less than 0.2 from a blade leading edge to a non-dimensional meridional location of 0.15, and the increase rate d² b /dm of the blade angle at a mid-span is not less than 0.25 from the blade leading edge to the non-dimensional meridional location of 0.15.
(FR) La présente invention a trait à un inducteur doté de multiples pales de même forme, la forme de l'inducteur permettant d'obtenir une stabilisation optimale du comportement de cavitation. Cet inducteur est doté de multiples pales de même forme, la charge de pale côté pointe étant supérieure au niveau de la moitié avant de la pale par rapport à la moitié arrière. Lorsque l'angle de pale depuis la direction circonférentielle de l'inducteur est βb(degrés) et la distance de plan méridien est m (millimètres), la vitesse d'augmentation de l'angle de pale dβb/dm est supérieure ou égale à 0,2 depuis le bord avant de la pale jusqu'à la position de plan méridien non dimensionnelle 0,15 du côté de la pointe, et est supérieure ou égale à 0,25 depuis le bord avant de la pale jusqu'à la position de plan méridien non dimensionnelle 0,15 à mi-longueur.