SU1553733A1 - Turbomachine grate - Google Patents

Abstract

The invention relates to turbomachine building and can be used in turbomachine grids consisting of two rows of blades (L). The purpose of the invention is to reduce the bending stresses in the root sections of L. An array of a turbomachine consisting of two rows L combined by a single bandage bond and having a slope L of the first row, opposite to the slope L of the second row relative to the radial direction. The use of such a construction makes it possible to reduce the level of bending stresses in the root sections of the blades, as well as the frequency of oscillations and vibration stresses by increasing the stiffness of the grating-band connection. 1 il.

Description

The invention relates to a turbomachine and can be used in turbomachine grids consisting of two rows of blades.

The purpose of the invention is to reduce bending stresses in the root sections of the blades of both rows.

FIG. Figure 1 shows a variant of a turbomachine grid consisting of two rectilinear rows of blades that are tilted in different directions with respect to the radial direction and united by a single bandage connection; Fig.2 scan cylindrical section of this type of blade apparatus.

The turbomachine grille 1 contains blades 2 of the first row, blades 3 of the second row, combined with blades 2 of the first row and a single band 4, disk 5 of the impeller.

The device works as follows.

Under the operating conditions of the turbomachine, under the action of centrifugal and gas-dynamic forces, the blades 2 of the first row will tend to rotate the band 4 in one direction, and the blades 3 of the second row - in the other. With geometrical symmetry of the blades of the first and second rows of forces, the rotation of the band relative to the disk 5 from the blades of the first row will be compensated by the efforts to turn the band from the blades of the second row.

This effect leads to the fact that the blades of both rows at the peripheral end are rigidly clamped. At the same time, the natural vibration frequencies and the level of vibration stresses of the blades decrease, the level of flexural stresses in the blades decreases, which as a result increases the reliability of the operation of the turbomachine grid 1.

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FIG A

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FIG. 2

Claims (1)

Claim The lattice of a turbomachine, consisting of two rows of blades having an inclination in the plane-j of the bone with respect to the radial direction and united by a common retaining bond, which consists in that, in order to reduce the bending stresses in the root sections of the blades, the inclination of the blades of the first row opposite the inclination of the blades of the second row.