Concrete volute pump
AssigneeALSTOM Technology Ltd
InventorsRomain Julien Mathieu Prunieres, Florent Longatte, Franvois-Xavier Catelan
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Abstract
A centrifugal pump is provided capable of pumping liquid volume flow rates of at least 20 m3/sec. The pump includes a centrifugal impeller rotatable about an axis and operable to direct a liquid towards a concrete volute arranged around the impeller. The pump further includes fixed fin-like elements arranged between the impeller and the volute. The elements form a discontinuous barrier around the impeller and are effective to reduce uneven radial thrusts exerted by the water on the centrifugal impeller, while limiting the water flow rate in a simple and economic manner.
Claims12
A concrete volute pump, comprising:
- a centrifugal impeller having blades, the impeller being arranged for rotation about an axis and operable to direct a liquid towards a concrete volute arranged around the impeller, wherein the pump further comprises fixed elements arranged between the impeller and the volute, said fixed elements comprising a discontinuous barrier around the impeller,
- wherein for each fixed element, the difference between a radial distance from the rotational axis of the impeller to an end of the fixed element closest to the impeller, and the radial distance from the rotational axis of the impeller to an end of a blade furthest away from the axis of the impeller, represents from 1 to 10% of the radial distance from the rotational axis of the impeller to a periphery of the impeller, and
- wherein, for each fixed element, the difference between the radial distance from the rotational axis of the impeller to a volute nozzle and the radial distance from the rotational axis of the impeller to an end of the fixed element furthest away from the rotational axis of impeller, represents from 3 to 10% of the radial distance from the rotational axis of the impeller to said end of the fixed element furthest away from the impeller.
Dependencies are inferred from the claim text.