26-12-2013 дата публикации
Номер: US20130341033A1
Принадлежит:
ZEITECS B.V.
A pump includes one or more stages, each stage including a tubular housing and a mandrel disposed in the housing. The mandrel includes a rotor rotatable relative to the housing and having: an impeller, a shaft, and one or more helicoidal blades on an outer surface of the impeller. The mandrel further includes a diffuser: connected to the housing, having the rotor shaft extending therethrough and having a plurality of vanes on an outer surface thereof. Each vane has an arcuate portion and a longitudinal portion. The diffuser further has a channel formed between an adjacent pair of vanes. The pump further includes a fluid passage formed between the housing and the mandrel. 1. A pump comprising one or more stages , each stage comprising:a tubular housing; [ an impeller,', 'a shaft, and', 'one or more helicoidal blades on an outer surface of the impeller;, 'a rotor rotatable relative to the housing and having, connected to the housing,', 'having the rotor shaft extending therethrough,', an arcuate portion, and', 'a longitudinal portion, and, 'having a plurality of vanes on an outer surface thereof, each vane having, 'having a channel formed between an adjacent pair of vanes; and, 'a diffuser], 'a mandrel disposed in the housing and comprisinga fluid passage formed between the housing and the mandrel.2. The pump of claim 1 , wherein each vane further has a width increasing along the arcuate portion toward the longitudinal portion.3. The pump of claim 1 , wherein:the diffuser has a cylindrical portion, andthe vanes are formed on an outer surface of the cylindrical portion.4. The pump of claim 3 , wherein:the cylindrical portion has a vaneless portion adjacent to an end of the longitudinal portion, andeach vane has curved edges at the end.5. The pump of claim 1 , wherein:the fluid passage has a convergent nozzle section, a throat section, and a divergent nozzle section,the blades are located in the convergent nozzle section, andthe vanes are located in the throat section.6 ...
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