SU1219840A1 - Impeller vane of suction centrifugal dredge - Google Patents

Description

"one

The invention relates to pump construction, namely to the design of the impeller blades of centrifugal pumps for pumping abrasive slurries.

The purpose of the invention is to increase the service life by reducing the intensity of hydroabrasive wear.

Figure 1 shows the impeller; FIG. 2 is a section A-A (rotated) in FIG.

The impeller blade of the soil centrifugal pump contains working 1 and back 2 surfaces, inlet section 3 and wear-resistant coating 4 on the back surface 2. Working surface 1 in the inlet section 3 is made at an acute angle about the back surface 2. Length of the wear-resistant coating 4 is 30% of the total blade length, the angle ot is recommended to be in the range of 20 to 35 °.

When the pump is operating, the abrasive slurry, the flow of the blade, makes their surfaces 1 and 2 wear.

A rotated

0

The intensity of the formation of a blade wear center depends mainly on the magnitudes of the angles o (the meeting of solid particles of the slurry with the surface of the blade. Since the angle of inclination is 0 (the inlet section 3 of the working surface 1 of the blade to the trajectory of the movement of solid particles .

the wear rate is less at a meeting angle of 90. During pump operation, the working surface 1 of the blade wears out to a greater extent than the wear-resistant coating layer 4. This leads to a permanent decrease in the meeting angle of solid particles with the working surface 1 of the blade and to a decrease in the intensity of their wear, since

less wear. The impeller should be replaced when a wear zone appears in the blades, the length of which exceeds 30% of the blade length, since the pump capacity is

significantly reduced. By reducing the intensity of the grooves, the service life of the impeller is increased 2.5-3.5 times.

Editor O. Golovach

Compiled by Tehr ed L. Oleinik

Order 1309/46 Circulation 586 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, Proektna St., 4

Proofreader V.Sinitska

Claims (1)

WORKING WHEEL SHOULDER OF THE SOIL CENTRIFUGAL PUMP, containing working and back surfaces, inlet section and wear-resistant. a certain coating on the back surface, characterized in that, in order to increase the pa6qibi resource by reducing the intensity of hydro-abrasive wear, the working surface at the inlet section is made at an acute angle to the back surface. Phys.} Stwr-ns> ί