SU901584A1 - Double-flow mixed-flow turbine - Google Patents

Description

(54) Two-flow RADIAL-AXIAL TURBINE

I

The invention relates to turbine construction and can be used in steam turbomachines.

A two-radial axial-turbine turbine is known, comprising a radial nozzle apparatus with an annular flow divider and axial working blade rims, between which there is a chamber with a separating annular ridge on the rotor 1).

However, when operating on wet steam, condensate is deposited in the chamber on the rotor surface, drops are dropped from the ridge to the flow divider, reflected to the nozzle apparatus and in the direction of the working crowns, falling on the blades at off-design angles of attack. Consolidation of the drops is facilitated by multiple recycling and accumulation in the chamber. Impact of droplets on blade surfaces Causes their erosion.

The purpose of the invention is to increase the reliability of the turbine by removing condensate in front of the working rims.

This goal is achieved by the fact that the flow divider is hollow and communicated with the chamber cavity through an annular

capped, equipped with lateral goats, bent into the cavity of the separator, and located in the plane of the ridge.

In addition, on the side surfaces of the ridge there are radial grooves.

The drawing shows a turbine, a longitudinal section.

The turbine contains a radial nozzle apparatus 1 with an annular separator 2 flows and axial working blade rims 3, between which is located the chamber 4 with a separating annular ridge 5 on the rotor 6, and the separators. The 2 streams are hollow and communicated with the cavity of the chamber 4 by means of an annular slit 7, provided with lateral visors 8 bent into the cavity of the separator 2, and located in the plane of the ridge 5, on the side surfaces of which radial grooves 9 are formed.

When operating on wet steam, the condensate is separated to the surface of the rotor 6 and, under the action of centrifugal forces, the slot ridge 5 is surrounded by a dividing crest

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the cavity of the separator 2 flows, from where it is sucked into the condenser (not shown). For improved condensate collection, radial grooves 9 are used on the side surfaces of the separation ridge 5.

The condensate settling in the chamber 4 on the surface of the rotor 6 is removed through the slot 7 into the cavity of the separator 2 flows, which prevents the enlargement of the droplets in the chamber, they fall on the surface of the nozzle and working blades.

Elimination of causes of turbine and turbine Vdk turbine will increase |, its reliability and efficiency. J (-... v,

Claims (2)

1. Double flow radial-axial turbine containing radial nozzle apparatus with 5844 An annular flow divider and axial working blades} 1e crowns, between which there is a chamber with a separating annular ridge on the rotor, are different because, in order to increase reliability by removing condensate in front of the working crowns, the flow divider is hollow and communicates with the cavity camera through the annular gap provided with 10 side canopies bent inside the cavity of the separator, and located in the plane of the ridge. 2. Turbine according to claim 1, characterized in that on the side surfaces $ 1 ridge made radial grooves. Sources of information taken into account in the examination 1. Swiss patent number 545414, cl. F 01 D 3/02, 1975.