GB1387718A - Rotary positive-displacement machines - Google Patents

Abstract

1387718 Rotary positive displacement machines PROCEDES TECHNIQUES DE CONSTRUCTION 11 April 1972 [19 April 1971] 16725/72 Heading F1F A rotary positive displacement machine, in which a rotor 11 is eccentrically mounted for rotation in a cylindrical housing 9 and has radially slideable vanes 16, has end-plates 10, 10' with cylindrical cavities 14 which receive respective ends of the rotor 11 with axial clearances 12, 12'. The vanes extend axially beyond the rotor extensions and have axial extensions 19, 19' which abut the end surfaces 15 of cavities 14, the central part of each vane extending radially outwardly to mate with the space defined by end surfaces 18 of plates 10, 10' and cylinder 9. The only accurate axial lengths that are needed are those of the parts of the vanes held between surfaces 18, the outer surfaces of the vane extensions sealingly contacting the inner cylindrical surfaces of cavities 14. This has an advantage over the past machines Figs. 1 and 2 (not shown) where the whole rotor and its vanes has to be manufactured to extremely fine tolerances to reduce leakage at the axial faces. An embodiment in which the projections 19, 19' are replaced by a single central radial vane projection is also described, Fig. 5 (not shown).