| 摘要 |
1,137,087. Turbines and centrifugal compressors; charging two-stroke engines. MASCHINENFABRIK AUGSBURG-NURNBERG A. G. March 15, 1966 [May 4, 1965], No. 11387/66. Headings F1B, F1C and F1T. In a centrifugal compressor the radially outer portions of the impeller blades 4, Fig. 1, serve additionally as turbine blades to provide auxiliary driving means by which the operation of the compressor can be adjusted. The driving medium, e.g. compressed air, is delivered through conduits 14, 15 tangentially into an annular duct 13 and thence through a complete nozzle ring 12. The nozzle ring may be in the form of an annular gap or a bladed nozzle ring. The latter may be formed of several segments. The duct 13 may be omitted and the chamber 10 utilized instead. The unsupported sides of the impeller blades may be curved in opposition to the direction of rotation to reduce entry shock of the driving medium, Fig. 3 (not shown). The delivery of driving medium may be used to variably throttle the outlet area of the impeller to prevent the onset of pumping. The compressor may be driven by a turbine 23, Fig. 5, driven by the exhaust gases of a two-stroke I. C. engine 21, the compressor delivering air to the engine through a cooler 27 and collector 29. Compressed driving air is delivered through conduit 31 to the nozzle ring in the compressor 24 by an auxiliary compressor 30 formed at the underside of the engine's piston, or through conduit 36 by another auxiliary compressor (not shown). Moreover, air blown off from the compressor at 38 for regulation purposes may be supplied through conduits 39, 36 to the nozzle ring. The auxiliary compressor 30 may discharge direct to the engine through a cooler 34 and the collector 29.
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