SU769095A1 - Vane impeller of pump for pumping abrasive liquids - Google Patents

Description

one

The invention relates to hydraulic engineering, more specifically to pumps for pumping abrasive fluids, and is intended for use in industries related to the mining and processing of minerals.

A pump impeller for pumping abrasive fluids is known, which contains a carrier disk and blades mounted on it with a working surface having a curvilinear portion adjoining the disk 1.

This disk-mating curved section of the blade area thickens the impeller in the area of its greatest wear and thereby increases the wear resistance of the latter. However, said blade cross section is constructed without taking into account the distribution of abrasive particles in the paddle wheel, therefore the blade surface is unevenly destroyed.

The aim of the invention is to increase the wear resistance of the paddle wheel -pump for pumping abrasive fluids.

This is achieved by the fact that the curvilinear section of the working surface of the blade is made in the form of two arcs, the first of which, adjacent to the working surface, has a center located from the disk on

distance, and radius, respectively, determined from the ratios:

, 51 / v2 + v | v2 + v

five

Ri 0,5 (в2в2- + / 1 +)

and the second, adjacent to the disk, is a center located at a distance of 1: 0 from the working surface, and a radius determined respectively from the ratios:

, 5 / e2 + ®l®T + ®2®r;

16, 5Ke + 026-2 (6207 + 1 + @ lQ-l),

where Oi 6 (1-0,6UV-4 / dD-i (ps-Pi) pr);

02 foSoZ-i; 20 Z - the number of blades;

fo is the inlet cross-sectional area;

So is the volumetric content of abrasive particles in the fluid at the entrance to the 25 wheel;

and - circumferential wheel speed;

V-average fluid velocity;

b - the width of the blades;

D is the diameter of the wheel in the area of greater wear;

(j is the density of the liquid;

PS the density of abrasive particles;

d is the size of the abrasive particles.

FIG. 1 shows a general view of the pump impeller; in fig. 2 is a section A-A of FIG. one.

The impeller of the pump contains a carrier disk 1 and loiatki 2 mounted on it with a working surface a having a curved section b. This curvilinear section is made in the form of two arcs 3 and 4. The arc 3, adjacent to the working surface a, has a center x located from disk 1 at a distance of 1, and a radius RI, respectively, determined from the relations

li 0.5 1 / in + efef + Ob

k, o, 5 | / v + e2, gh0v7 + K1 + v {v-1.

Arc 4, adjacent to disk 1, has a center y located from the working surface a at a distance b, and a radius Rs determined respectively by the relation:

, 5 Kv2 + 01®G + 0iv7,, in | vG (+.

When the motion path of abrasive particles to the impeller is different from the flow lines of the liquid, the abrasive particles therefore occupy only a part of the wheel section with an area equal to 82. provide equal wear of the blade 2 and, as a result, increase the wear resistance of the paddle wheel.

The invention provides improved durability of the impeller pump for pumping abrasive fluid.

Claims (1)

1. Suprun V. K- Abrasive wear of grunov pumps and struggle with it. - M .: Mashinostroenie, 1972, p. ten. i