Sulzer Management

A line shaft pump for extracting a fluid from a geothermal production well is proposed, wherein the geothermal production well comprises an inner well surface, wherein the line shaft pump comprises a drive unit and a hydraulic unit with a rotor, wherein the hydraulic unit comprises an inlet section for receiving the fluid at a suction pressure, an outlet section comprising a discharge head for discharging the fluid at a discharge pressure, and a riser tube, wherein the rotor comprises at least one impeller for conveying the fluid from the inlet section to the outlet section, wherein the impeller is arranged within an impeller section, wherein the rotor further comprises a line shaft for rotating about an axial direction, wherein each impeller is fixedly connected to the line shaft, wherein the line shaft comprises at least one line shaft segment and extends from a first end to a second end, wherein the first end is arranged at the drive unit, wherein the line shaft is configured for transmitting rotational energy from the drive unit to the at least one impeller, wherein the riser tube comprises a first outer surface and a first inner surface, wherein the riser tube is arranged vertically between the impeller section and the discharge head and configured to supply the fluid from the impeller section to the discharge head, wherein an essentially impermeable lubricant retention tube for transporting a lubricant is arranged within the riser tube and configured to surround the line shaft at a distance, providing an essentially vertical channel delimited in radial direction by the line shaft and the lubricant retention tube, characterized in that the hydraulic section comprises at least one centralizer arranged to surround the riser tube forming an axial through hole for receiving the riser tube, wherein each centralizer is in intimate contact to the first outer surface, wherein the radial dimensions of each centralizer are smaller than the radial dimensions of the inner well surface, wherein each centralizer is configured such that the radial distance between the first outer surface and the inner well surface is essentially constant in all radial directions at the axial position of each centralizer, wherein each centralizer comprises at least one additional axial through hole. The invention additionally proposes a method for installing a line shaft pump.

A sealing assembly (1) for sealing a rotor shaft (2) for a vertical axis pump / mixer (13) to prevent liquid flow between a housing (3) and the rotor shaft (2), the sealing assembly (1) comprises a stator bush (4) to be fasten to the housing (3), and an upper seal pair (6) and a lower seal pair (7), both comprising a pair of seal rings (8) forming a slide surface between the pair of seal rings (8) and the seal rings (8) are slidable against each other, in each of the pair of seal rings (8), a first seal ring (9) is stationary coupled to the stator bush (4) while a second seal ring (10) is rotatable and coupled to the rotor shaft (2), slide surfaces (60, 70) of both upper seal pair (6) and lower seal pair (7) are cooled / lubricated with sealing liquid (SL) when in use. The stator bush (4) comprises a sleeve (14) forming a weir (15) that configures an annular volume (12) for sealing liquid (SL), the stator bush (4) is provided with a fluid channel (11) that opens to the annular volume (12) for providing sealing liquid (SL) to the annular volume (12), the height of the weir (15) is greater than the level of the slide surface (60) of the upper seal pair (6) in axial direction so that a sealing liquid (SL) level is above the slide surface (60) of the upper seal pair (6)..

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Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …