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US 12,320,355 B2Granted
Screw assembly for a triple screw pump and screw pump comprising said assembly
AssigneeSettima Meccanica S.r.l.
InventorManuele Rossi
Life of this patent
Estimating the term…
Abstract
Screw assembly (1) for a triple screw pump (10), comprising: a central screw (2) and at least one lateral screw (3) configured to mesh with said central screw (2) with a lateral screw axis (zl) parallel to the central screw axis (zc), wherein a central screw external diameter (Øce) is greater than a lateral screw external diameter (Øle) and a central screw internal diameter (0ci) is smaller than the lateral screw external diameter (Øle).
Claims15
A screw assembly for a triple screw pump, comprising:
- a central screw having one or more threads with constant pitch and two lateral screws configured to mesh with said central screw, each with a lateral screw axis parallel to a central screw axis, wherein a central screw external diameter is greater than a lateral screws external diameter, wherein a central screw internal diameter is smaller than the lateral screws external diameter;
- wherein a cross-sectional profile of the lateral screws has a flank which follows an epitrochoid, said flank being joined to a truncation circle by a face;
- wherein the flank and the face connect in an inflexion point on the cross-sectional profile of the lateral screws.
A screw assembly for a triple screw pump, comprising:
- a central screw having one or more threads with constant pitch and two lateral screws configured to mesh with said central screw, each with a lateral screw axis parallel to a central screw axis, wherein a central screw external diameter is greater than a lateral screws external diameter, wherein a central screw internal diameter is smaller than the lateral screws external diameter;
- wherein a cross-sectional profile of the lateral screws has a flank which follows an epitrochoid, said flank being joined to a truncation circle by a face;
- wherein said face of the lateral screws is curvilinear and joined to the flank and the truncation circle without angular points (non-differentiable point of the first kind).
Dependencies are inferred from the claim text.