Volumetric rotary machine with rotors having asymmetric...

F - Mech Eng,Light,Heat,Weapons – 04 – C

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F04C 18/16 (2006.01)

Patent

CA 2596603

The invention relates to a volumetric rotary machine (1) comprising a housing (2) and at least two twin rotors (3, 4) that have asymmetric profiles each having at least one helicoidal thread (7) that, in a direction radial to the longitudinal axis (6) of the one considered of the twin rotors (3, 4) and above the surface (51) of this rotor, has a first predetermined dimension ( h ) and, on the one hand, a first flank (9) has a modified curve. This volumetric rotary machine (1) comprising a housing (2) and at least two twin rotors (3, 4) having asymmetric profiles, is characterized in that these twin rotors (3, 4) are each comprised of a hub (5) from which at least one helicoidal thread (7) projects that extends above said hub (5) like a tooth (8). This tooth (8), in a direction radial to the longitudinal axis (6) of the one considered of the twin rotors (3, 4) and above the surface (51) of this rotor, has a first predetermined dimension ( h ). This machine is further characterized in that it does not comprise a first flank (9) and a second flank (10) whose conventional curves (91) and (101) meet at a first point ( w ) whereby forming a sharp edge along the helicoidal thread (7). Rather, on the one hand, the first flank (9) has a curve (92), called modified curve (92), of which the position and the length of arc are predetermined in such a manner that this modified curve (92) of the first flank (9) and the conventional curve (101) of the second flank (10) each join one of the opposite ends ( B ) and ( C ) of a short joining section (12) that, due to its presence all along the helicoidal thread (7), constitutes a helicoidal surface (13) that eliminates the presence of a sharp edge and, on the other hand, this joining section (12), in a direction radial to the longitudinal axis (6) of the one considered of the twin rotors (3, 4), has a second predetermined dimension ("L") such that the ratio of the second dimension ( L ) to the first dimension ( h ) ranges from 0.005 and 0.1 (five thousandths and a tenth).

Machine rotative volumétrique (1) comprenant un boîtier (2) et au moins deux rotors jumelés (3, 4) dits à profils asymétriques, ayant chacun au moins un filet hélicoidal (7) qui a dans une direction radiale à l~axe longitudinal (6) de celui des rotors jumelés (3, 4) consideré et au-dessus de la surface (51) de ce rotor une première dimension prédéterminée (« h »), et d~une part, un premier flanc (9) a une tracé modifié, don~t la position et la machine rotative volumetrique (1) comprenant un boîtier (2) et au moins deux rotors jumelés (3,4) dits à profils asymétriques, ces rotors jumelés (3,4) étant chacun constitué d~un noyau (5) sur lequel fait saillie au moins un filet héliocoidal (7) qui, s~étend au dessus dudit noyau (5) à la manière d~une dent (8), a dans une direction radiale à l~axe longitudinal (6) de celui de rotors jumelés (3,4) considéré et au-dessus de la surface (51) de ce rotor une première dimension prédéterminée (« h »), cette machine étant caractérisée en ce qu~au lieu de comprendre un premier flanc (9) et un deuxième flanc (10) don~t les tracés conventionnels (91) et (101) se raccordent en un premier point (« w ») de manière à former une arête vive a long du filet héliocoidal (7) : - d~une part, ledit premier flanc (9) a un tracé (92), dit tracé modifié (92), don~t la position et la longeur d~arc son prédéterminées de manière telle que ledit tracé modifié (92) de ce premier flanc (9) et le tracé conventionnel (101) du deuxième flanc (10) se raccordent chaun à l~une des extrémités opposées (« B ») et (« C ») d~un court segment de raccordement (12), aui par sa présence tout au long du filet hélicoidal (7) constitue une surface hélicoidale (13) supprimant la présence d~une arête vive, et d~autre part, ledit segment de raccordement (12) a, dans une direction radiale à l'axe longitudinal (6) de celui des rotors jumelés (3, 4) considéré, une deuxième dimension ("L") prédéterminée, telle que le rapport de la deuxième dimension ("L") sur la première dimension ("h") est compris entre 0,005 et 0,1 (cinq millièmes et un dixième).

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