Profile of a screw pump

Details Profile of a screw pump Profile of a screw pump

B - Operations, Transporting

23

G

B23G 1/32 (2006.01)

Patent

CA 2435040

The invention relates to the production of screw pump rotors comprising a pitch and/or depth of teeth which can be modified along the axis of the rotor. By means of a simple profiled machine tool (7), a first part of the profiled flank contour is clearly defined along the rotor axis (8) by means of its specific tool guide mechanism, and is then produced in a definitive manner. The remaining second part of the profiled flank contour is then determined according to the rolling movement of the pair of rotors according to the first part of the profiled flank contour carried out by the tool, by means of an approximation which is as precise as possible. It is thus possible to obtain transversally different profiled contours according to the pitch and/or depth of teeth which can be modified along the axis of the rotor. A disk milling cutter is selected to be used as a profiled machine tool.

L'invention concerne la fabrication de rotors à broche hélicoïdale présentant un pas et/ou une hauteur de dent pouvant être modifiés le long de l'axe de rotor. Au moyen d'un simple outil d'usinage de profilé (7), une première partie du contour de flanc profilé est définie de manière univoque le long de l'axe de rotor (8) au moyen de la configuration spécifique dudit outil, puis réalisée de manière définitive. La deuxième partie restante du contour de flanc profilé est ensuite déterminée en fonction du mouvement de roulement de la paire de rotors, selon ladite première partie du contour de flanc profilé réalisée par l'outil, par l'intermédiaire d'une approximation la plus précise possible. Ainsi, il est possible d'obtenir différents contours profilés en coupe frontale en fonction du pas et/ou de la hauteur de dent variant le long de l'axe de rotor. L'outil d'usinage de profilé se présente sous la forme d'une fraise disque.

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