SU1386749A1 - Centrifugal pump impeller - Google Patents

Abstract

The invention was used in vertical submersible centrifugal pumps pumping high-temperature aggressive media, for example liquid metal coolant, which are characterized by the presence of a sufficiently long shaft, therefore, increased beating of the latter. The purpose of the invention is improving the reliability of the pump when pumping high temperature corrosive media. Wire elements of different lengths are grouped into bundles - enclosed in elastic sheaths. Such an implementation eliminates the contact of the beam with the pumped medium and improves the hydrodynamics of the flow part of the pump by reducing losses due to friction and flow turbulization. 1 Goat f-ly, 2 ill. € (L

Description

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The invention relates to pump construction and can be used in vertical submersible centrifugal pumps, when pumping high-temperature aggressive media, but, for example, liquid-metal heat- ing, and which are characterized by the presence of a sufficiently long shaft, and, consequently, increased beating of the pump.

The purpose of the invention is to increase the performance of work when pumping into high-temperature aggressive units.

FIG. 1 shows a working case of a centrifugal pump during operation, a longitudinal section; FIG. 2 - A-A treatment in FIG. one

The centrifugal pump impeller contains a hub 1 with wire injection elements fixed on it, grouped - iiH into bundles 2, enclosed in elastic: flexible adhesive shells, for example, thin- {remaining steel tubes. The wave elements in bundle 2 can be made of different lengths to obtain Nucci 2 with variable elasticity in length. The impeller is mounted in housing 3, equipped with inlet and outlet pipes 4 and 5 on shaft 6. When pumping, the pumped medium enters housing 3 through inlet pipe 4, where it receives kinetic energy from rotating beams | 2, which, under the action of the resistance force I and the centrifugal force, acquire the form of profiled blades. Moreover, the required profile of the beams 2 can be set taking into account the properties of the pumped medium and the number of wheel revolutions, changing the elasticity of the beams 2, for example, by changing the geometric

sizing entry looking for wire elements in them. Elastic flexible sheath is necessary for fastening the wire elements in bundle 2, excluding their contact with the pumped medium

and improving the hydrodynamics of the pump flow part by reducing friction losses and flow turbulization.

When the pump is operated, the beams 2 self-center — they do not touch the walls of the housing 3 due to the hydrodynamic wedge that presses the beams 2 away from the walls of the housing 3 during their relative movement even with significant beatings of the shaft 6, the non-perpendicularity of the axes of the shaft 6 and the housing 3 and in the presence of dispersed impurities in the pumped medium.

Claims (2)

1. The impeller of a centrifugal pump, containing a hub with -1I wire elements fixed on it, and characterized by the fact that, in order to increase the reliability of operation when pumping high temperature corrosive media, the wire elements in the bunches, and the latter are enclosed in elastic flexible shells. 2. According to claim 1, characterized in that the wire .Q elements in the bundle are made of different lengths about FIG. Fi.g