SU1514976A1 - Centrifugal pump impeller - Google Patents

Abstract

The invention makes it possible to reduce the vibroactivity of the impeller of a low-speed centrifugal pump. The blades 3 with the output edges 4 are located between the leading and covering disks 1,2. The edges 4 are placed on a diameter smaller than the outer diameter of the disks 1.2 and form with the disks 1.2 of the chamber 5. The area of the cylindrical cross section of the chamber 5 on the periphery of the wheel 6 is smaller than the cross section of the diameter of the edges 4. In the meridional section the chamber 5 is made as a narrowing nozzle with parallel walls 7.8 at the periphery 6. The restructuring of the flow in the cavity does not lead to large energy losses, since the fluid rotates with the wheel and the flow rates relative to the walls are small. 1 il.

Description

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The invention relates to pump construction, namely to the designs of impellers of low-speed centrifugal pumps.

The purpose of the invention is to reduce the vibration of the wheel.

The drawing shows the proposed wheel.

The centrifugal impeller wheel contains the leading and top 1, 2 located between them, they have 3 packs with outward edges 4 placed on diameter D smaller than the outer diameter D of discs 1, 2, with formation between the edges 4 and discs 1, 2 chambers 5. The cylindrical cross-section of the chamber 5 on the periphery of the wheel 6 is smaller than the cross-sectional area on the diameter D of the outlet edges 4. In the meridional section, the chamber 5 is made in the form of a tapered nozzle with parallel walls 7, 8 on the periphery 6 of the wheel

As the impeller rotates, the fluid is sucked in by the entrance edges and gets onto the blades 3 of the impeller and then from the edges of 4 blades into the nozzle chamber 5. Here there is a flow build-up, which in the confused part of the wheel, diameters D and D any confuser is distributed to the periphery 6, both along the meridional and tangentially component of velocity. So, from chamber 5, an almost pulsating flow emerges. Confusion of flow

also contributes to the increase of its tangential component, which increases the pressure of the pump. The pulsed flow at the exit of the impeller, interacts with the elements of the spiral retraction of the tongue and the diffuser, provides the minimum vibroactivity and maximum efficiency, since in the retraction (at the nominal mode of the pump operation) the flow does not have to be rebuilt and interactions with fixed walls. However, the adjustment in current in the cavity of the impeller does not lead to large energy losses, since the liquid rotates with the wheel and the flow velocity relative to the walls of the wheel is small.

Claims (1)

Invention Formula The impeller of the centrifugal pump containing the drive and cutter discs, blades located between them with output edges placed on a diameter smaller than the outside. the diameter of the disks with the formation between the edges and disks of the chamber, characterized in that, with the aim of reducing the wheel vibroactivity, the area of the cylindrical section of the chamber at the periphery of the wheel is less than the section area at the diameter of the output edges, and in the meridian-oval section A parallel nozzle with parallel walls at the periphery.