Adjustable radial-flow diffuser

An adjustable radial flow diffuser for a radial flow compressor, comprising:

• adjusting elements having diffuser blades, said adjusting elements being arranged in a diffuser annulus uniformly distributed along the diffuser circumference with an angular pitch .delta., said adjusting elements further being swivellable about and adjusting axis V parallel to the longitudinal axis of the compressor for changing the narrow cross-section between the diffuser blades,
• wherein said adjusting elements have one of a substantially U-shaped and H-shaped cross-section with sector-shaped plates that are mounted on both sides of a blade root to form the legs and the diffuser blade forming the web of said one cross-section,
• wherein as an inlet-side lengthening of the plates, one wedge-shaped step respectively is arranged which has a circular recess which is concentric with respect to the adjusting axes V, and reaches around the end, and the height of the step is adapted to the plate thickness d for the formation of a continuous transition.

A radial-flow diffuser for a radial flow compressor, comprising:

• adjusting elements having diffuser blades, said adjusting elements being arranged in a diffuser annulus uniformly distributed along the diffuser circumference with an angular pitch .delta., said adjusting elements further being swivellable about and adjusting axis V parallel to the longitudinal axis of the compressor for changing the narrow cross-section between the diffuser blades,
• wherein said adjusting elements have one of a substantially U-shaped and H-shaped cross-section with sector-shaped plates that are mounted on both sides of a blade root to form the legs and the diffuser blade forming the web cross-section,
• wherein the outlet-side edge of the adjusting elements has a circular-arc-shaped course, the edge, in the case of the angular position of the adjusting elements pertaining to the maximal narrow cross-section Q.sub.max, resting on a cylinder surface Z which is concentric with respect to the longitudinal axis L of the compressor.

An adjustable radial flow diffuser for a radial flow compressor, comprising:

• adjusting elements having diffuser blades, said adjusting elements being arranged in a diffuser annulus uniformly distributed along the diffuser circumference with an angular pitch .delta., said adjusting elements further being swivellable about and adjusting axis V parallel to the longitudinal axis of the compressor for changing the narrow cross-section between the diffuser blades,
• wherein said adjusting elements have one of a substantially U-shaped and H-shaped cross-section with sector-shaped plates that are mounted on both sides of a blade root to form the legs and the diffuser blade forming the web of said one cross-section,
• wherein adjacent adjusting elements engage in one another in an overlapping manner at least on a portion of their swivel range.