Adjustable stator blade diffuser for centrifugal compressor - has hollow blades with one resilient wall and pressurising means

摘要

The diffusor has an adjustable cross-sectional flow area. Each hollow stator blade is provided with a resilient wall on the side which is at the shortest distance from the entry side of the adjacent blade and with an inlet orifice for a pressurised fluid. The resilient wall may be spring-loaded to return to its un-deformed condition. The internal pressure in the hollow blade may be controlled as a function of the position of the pre-swirl blades. An advantage, is the fact that separate sealing elements are not essential, since the common control of the diffusor cross-sectional area provides static sealing against the pressure medium.