SU566026A1 - Axial compressor - Google Patents

Description

(54) AXIAL COMPRESSOR

one

The invention relates to the field of compression engineering.

Known axial compressor, comprising a housing with an annular cavity connected to the flow part by means of slots made in the spacer, over which the ring 11 is movable in the axial direction.

However, in such a compressor there is no possibility of adjusting the operating modes.

Also known axial compressor, the closest to the invention of the technical essence and comprising a housing with an annular cavity connected to the flow part with slots made in the spacer. above which there is an axially movable ring, and an inlet guide device placed in the housing with a blade rotation mechanism equipped with levers 2. However, in such a compressor it is impossible to simultaneously adjust the width of the slots and the blade installation angle.

The aim of the invention is to expand the range of stable operation of the compressor.

during start-up, by simultaneously adjusting the slit flow areas with rotation of the blades.

This is achieved by the fact that in the proposed compressor the ring is hingedly connected with the levers

FIG. 1 schematically depicts the proposed compressor, a longitudinal section; in fig. 2 is a view along arrow A in FIG. one.

The axial compressor includes a housing 1 with an annular cavity 2 connected to the flow part 3 by slits 4 made in the spacer 5, over which an axially movable ring 6 is mounted. In the housing 1 there is an input n guiding device 7 with a blade rotation mechanism 8 equipped with levers 9. A ring 6 is connected with levers 9 hinges 10. An impeller 11 is mounted behind the inlet guide vane 7.

In the process of starting the blades of the inlet direction 5 of the other apparatus 7 and the ring 6 occupy a position in which the flow areas of the slots 4 are maximum. Part of the flow on the periphery of the impeller 11 under

the influence of the pressure differential through the slits 4 is directed into the cavity 2, and from there to the flow part 3 at the entrance to the impeller 11. The circulation of the flow causes the flow of air at the entrance to the impeller 11 due to the suction of the boundary layer and draws disruption of flow

impeller blades 11. This increases the range of stable operation of the compressor.

. As the revolutions increase, the blades of the inlet guide vane 7 are rotated, while the ring 6 moves with the levers 9 and reduces the working flow area of the slots 4. The air flow through the slits 4 decreases, which has a beneficial effect on the compressor efficiency, at revolutions close to nc, on which aaaa for stable operation of the compressor is sufficient, therefore a gradual shutdown of the shells 4 does not impair the reliability of the compressor in operation. The optimal law of movement of the ring 6 depending on the angle of rotation of the blades of the input guide vane 7 is ensured by the appropriate choice of the length of the levers 9 and their initial angular position relative to the blades, as well as the initial position of the ring 6 relative to the front of the slots 4. For example, complete closure of the slots 4 can occur at a speed equal to 70% of the calculated.

Active regulation of the flow area of the slots 4 during the start-up and exit on

working speed ensures stable operation of the compressor with high efficiency. The use of elements of the mechanism for rotating the blades of a Bxoft guide vanes to regulate the cross section of the slots simplifies

a design with the effects of compressor mechanization. Simultaneous with the rotation of the blades, the regulation of the flow areas of the slots allows for more efficient control of the compressor.

Claims (2)

1. The author's certificate number 358548, cl. F 04e127 / GS, 1969. 2. US patent number 3502260, cl. 41527, 1971. .one Type A