Abstract: To increase the efficiency of energy transfer from an auxiliary compressed air supply (12, 13, 14) to the compressor blades or vanes (22) of an exhaust gas turbosupercharger compressor (1), auxiliary drive vanes (23) are formed at the compressor wheel, located for reception of streams of compressed air from the auxiliary compressed air supply, the auxiliary compressed air escaping to the compressed air outlet manifold of the turbosupercharger for introduction to an inlet of an internal combustion engine (ICE) if extra charging air is required thereby. The auxiliary compressed air injection nozzles may be formed with bores in a part (17) of the compressor housing or as grooves (40) in the circumference thereof, fitted against a closing flange (39) of another portion of the compressor housing. The auxiliary vanes or blades may be located at or close to the periphery of the compressor wheel (7), either on the front side, where the main compressor blades (22) are located, or on the back side thereof.

Abstract: The twin exhaust-gas-powered turbines (9, 10) driving intake air compressors (1, 2) for an internal-combustion engine are connected together and mounted on central support brackets (47, 48) by a common turbine discharge housing (20) that deflects the discharge of each turbine separately towards an outlet funnel (24) with the help of a guiding structure that contains a median wall (33). Diffuser horns (31, 32) and hollow central plugs provide, in a short axial distance, for establishing a static pressure for causing the gas to flow with uniform pressure distribution out through the discharge funnel (24). The latter portion of the outflow path is enlarged by side pieces (26, 27) fitting over holes in the central piece (20) of the discharge casing through which the diffuser horns (31, 32) protrude with ample spacing from other components.

Abstract: The inner spiral wall of each spiral feed duct of a turbine is provided with a slidable extension tongue with an end portion of spiral curvature mounted on a carrier plate for rotation about the machine axis. Movement of the tongue to extend the length of the inner duct wall reduces the exit cross-section of the duct while keeping a spiral shape at the duct end. The tongue may be mounted on a portion of the machine casing that is made integral with the discharge duct that is coaxial with the machine and is mounted axially rotatable on the machine casing. When an axial flow rotor is used, the ducts and tongues have deflecting rims and the tongues have end walls at the rim ends to define the zone of communication between the rotor and each duct. One of the applications of the invention is to exhaust gas driven superchargers for internal combustion engines. A discharge spiral for a rotary pump or compressor may be similarly equipped.