Screw pump
AssigneeNETZSCH Pumpen & Systeme GmbH
InventorEduardo Nuss
Life of this patent
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Abstract
A screw pump includes a pump housing in which a pump spindle is rotatably mounted with the involvement of a hydrostatic thrust bearing for absorbing the axial thrust which is produced at the spindle during operation, the hydrostatic thrust bearing being formed by a housing-fixed bearing surface, against which an end-face, spindle-fixed bearing surface of the pump spindle is indirectly supported, by virtue of the fact that the housing-fixed bearing surface and the spindle-fixed bearing surface form a bearing gap therebetween, which bearing gap is fed, in its central region, with a pressure fluid which flows out through the bearing gap in the radial direction, preferably into the intake region, and the hydrostatic pressure of which counteracts the axial thrust.
Claims16
A screw pump comprising a pump housing, in which a pump spindle is rotatably mounted with the involvement of a hydrostatic thrust bearing to absorb an axial thrust created during the operation on the spindle,
- wherein the hydrostatic thrust bearing is formed by a housing-fixed bearing surface, against which an end-face, spindle-fixed bearing surface of the pump spindle is indirectly supported,
- wherein the housing-fixed bearing surface and the spindle-fixed bearing surface form a bearing gap therebetween, wherein the bearing gap in a central region is fed with a pressure fluid, which flows out through the bearing gap in a radial direction into a suction region and a hydrostatic pressure of which counteracts the axial thrust,
- wherein the pump spindle includes an actuating pin, which, as a function of a current axial position of the spindle, mechanically opens or closes a valve, said valve controlling an inflow of the pressure fluid into the bearing gap.
Dependencies are inferred from the claim text.