SU800394A1 - Secondary supply of partial turbine - Google Patents

Description

(54) REPEATED SUB-FLOOR OF PARTIAL TURBINE

This invention relates to turbomachinery, in particular to rotary carriages of partial turbines.

Known re-supply of the partial turbine, containing a profiled channel, informing the cavity behind the blades with nozzle unit l

However, such an implementation is characterized by relatively large profile losses due to the substantial non-uniformity of the velocity field in the channel.

Also known is the repeated supply of a partial turbine containing a screw channel that connects the cavity behind the working blades, which has an outer and an inner wall with a nozzle device.

A disadvantage of the known implementation is the complexity of the design, limiting the possibility of widespread use.

The purpose of the invention is to simplify the design.

This goal is achieved by the fact that the outer and inner walls of the cavity are flat, and in the latter, longitudinal partitions are installed, dividing it into separate sections in which diffuse scapular grilles are installed, and the channel has a constant cross section. In partitions can be made holes with valves installed in them.

FIG. 1 shows a partial re-feed turbine,

0 is a meridional section; FIG. 2 is a section A-A in FIG.

Repeated supply contains a screw channel 1, together a cavity 2 behind the blades 3, ime tsuyu

five . the outer and inner walls 4 and 5, with the nozzle apparatus 6. The walls 4 and 5 of the cavity 2 are made flat, and in the latter the longitudinal partitions 7 are installed, dividing it into separate sections 8 in which diffuse scapular grilles 9 are installed, and Channel 1 has a constant cross section. In partitions 7 there are holes 10 with valves 11 installed in them.

Repeated approach works as follows.V

The working fluid, the output of the working 30 blades 3, brakes in the blade

grids 9, due to which the pressure increases. Then the flow of the working fluid enters the screw channel 1 and then into the nozzle device b re-supply. The similar current of the worker is characteristic for each subsequent supply. With the proposed implementation, the total losses are reduced, so as the braking is carried out in the blade grids with high efficiency, and in the curvilinear canape the flow is rotated at the minimum pronounced flow rate and therefore with small losses.

In variable modes, the flow of the working fluid can get into sections not directly connected to the screw channel 1. In this case, due to the resulting pressure difference between the sections, valves 11 are opened, and the flow through the opening 10 enters the section communicated with channel 1.

Simplification of the design is achieved by the fact that the very difficult part of the re-supply (screw channel) is made of a constant cross section, which allows the use of conventional normalized pipes, and the implementation of sections with blade grids, in which the main flow braking occurs, does not present technical difficulty.

Claims (2)

1. Repeatedly supplying a partial turbine containing a screw channel, communicating a cavity behind the working blades, having external and internal walls with a nozzle apparatus, characterized in that, in order to simplify the design, the external and internal walls of the cavity are flat, and in the latter are installed longitudinal partitions dividing it into separate sections, in which diffuser shoulder grilles are installed, and the channel has a constant cross section. 2. The approach according to Claim 1, about the t. L. Of course, and with the fact that in the partitions there are holes with valves installed in them. Sources of information taken into account in the examination 1. Yemin ON, Zaritsky S.P. Air and gas turbines with single nozzles. M., Mechanical Engineering, 1975, p. 188-194. 2.Frolov V.V., Ignatyevsky E.A. The problems of designing turbine stages of low power. - Abstracts of reports at the conference on the improvement of modern steam turbines, no. 183. Kaluga, 1972. (Puij