SU1355768A1 - Method of balancing pump blade wheel - Google Patents

Description

The invention relates to hydraulic engineering, in particular to methods of balancing the turning of the rotor blade impellers of axial pumps, and can be applied when balancing the impellers of hydroturbines.

The purpose of the invention is to simplify the process and improve the accuracy of balancing the pump impeller.

The drawing shows a diagram of an unbalanced rotor axial pump.

A rotor of an axial pump including an impeller 1 with blades 2 and a shaft 3 mounted in the upper 4 and lower 5 guide bearings. The axis of the impeller 1 is located at a distance h from the lower bearing and at a distance h from the upper bearing,

- The balancing method is carried out as follows.

The impeller is informed of the rotation in the operating mode and its imbalance is determined — the zero point is fixed on it, the magnitude and the vector of the radial load R, reduced to the axis of the impeller, are determined from the relation:

R: R-hl, lb b

where R is the magnitude and vector of the radial load acting on the lower bearing 5 (determined by a known method, for example, oscillography).

Then compensate hydraulically imbalance. an increase in the installation angle of the vanes angle, consecutively located from the radial load vector, and depending on the angle between the latter and the axis near the located blade against the direction of rotation of the rotor, nd. the value determined from the ratios:

57.3R-sin / (f-90% --- /

uV

t tgv, sin s | 0.

, V, Ix3R cosCL „

T.tgVysipz | -

where lu, and & v, j - respectively, an increase in the installation

five

0

five

the angles of the first and second pairs, ate, following the load vector against the direction of rotation of the rotor,

R - radial load

from imbalance, reduced to the axis of the impeller blades;

T - tangential force,

acting on the blade

H is the angle between the radial load vector and axis b located at the 5th blade against the direction of rotation of the rotor;

V is the installation angle of the blade with respect to the average diameter relative to the axis of rotation of the wheel,

Z - the number of blades of the impeller.

If ----, then

fj

an increase in the installation angle of the second and third blades, sequentially arranged from the load vector against the direction of rotation of the rotor by an amount determined from the Relationships:

V,

& .v.

57.3R.sln (4-90 -n - ™ /

U

 360 °

T. tgV, - E; in ™ 2ZA25l 25

Trtgv bin lp

, respectively, an increase in the installation angle of the second and third blades, following the load vector against the direction of engagement.

In the implementation of the proposed method does not require special equipment (d is enough to have

equipped repair bases). The method is carried out in own supports at the workplace in the working mode of the hydraulic unit. According to the method, it is possible to determine and eliminate hydraulic imbalance, significantly exceeding and often not coinciding in direction with imbalance of idle.

Claims (1)

METHOD FOR PUMP VALVE BALANCING, which consists in communicating to the wheel of rotation, determining the imbalance and eliminating it, characterized in that, in order to simplify the process and improve accuracy, the imbalance is eliminated by turning the wheel blades. SU .... 1355768