Method for preventing damage by corrosion of the adjustable mechanism of guide blading of turbomachines and turbomachine with corrosion prevention device

摘要

1,085,438. Axial-flow compressors and turbines. BROWN BOVERI & CO. Ltd. June 21, 1965 [June 23, 1964], No. 26223/65. Headings F1C and F1T. In an axial-flow compressor or cold gas turbine in which the mechanism 4, 5 for adjusting the guide vanes 6 is arranged within a chamber 10 sealingly pressurized as by the compressor delivery air, cooling of at least some of the internal surface of the chamber by the external cooling effect of the air entering the compressor is reduced or avoided. This prevents condensation within the chamber of water vapour carried by the pressurized sealing air and thereby avoids corrosion of the vane adjusting mechanism. The reduced cooling of the internal surface of the chamber is effected by insulating at 16 the guide blade carrier 2 and separating it from an entry collar 17, by providing a pair of electrical heating rods (8), Figs. 1 and 2 (not shown), by guiding all the incoming pressurized sealing air along part of the internal surface, Fig. 3 (not shown), by insulating part of the internal surface, Fig. 4 (not shown), by insulating part of the external surface of the chamber, Fig. 5 (not shown), or by a combination of these methods.