Abstract: A pump assembly for delivering a medium via a flow chamber (13) defined by a hydraulic housing and a housing cover, includes a pump shaft rotatably drivable about an axis of rotation, an impeller fixed to one end of the pump shaft inside the flow chamber, a bearing carrier. The pump assembly further includes a lubrication and cooling system with oil recirculation in the bearing carrier.

Abstract: A pump assembly for delivering a medium via a flow chamber (13) defined by a hydraulic housing and a housing cover, includes a pump shaft rotatably drivable about an axis of rotation, an impeller fixed to one end of the pump shaft inside the flow chamber, a bearing carrier. The pump assembly further includes a lubrication and cooling system with oil recirculation in the bearing carrier.

Abstract: A wastewater-lifting system and a method for operating a wastewater-lifting system guides wastewater loaded with bulky materials into a bulky material collection tank having at least one separating screen. During intake of wastewater, the bulky materials are retained in the bulky material collection tank and pre-cleaned wastewater passes into a liquid collection tank via a connection line and one or both of a pump and a bypass line connected to the connection line. During the wastewater intake a pivoting flap in the connection line closes flow to the pump except for a flushing cross section, and opens the bypass line. During a pumping operation, the pivoting flap opens the connection line from the pump and closes the bypass line.

Abstract: A wastewater-lifting system is provided. The wastewater-lifting system includes at least one bulky-material-collecting vessel for wastewater loaded with bulky materials which is guided therethrough, a liquid-collecting vessel for the wastewater which is freed from bulky materials and precleaned in the bulky-material-collecting vessel, and with a wastewater shaft for accommodating the bulky-material-collecting vessel and the liquid-collecting vessel. The liquid-collecting vessel and the wastewater shaft have at least one common wall surface. The liquid-collecting vessel defines a closed-off space with only a partially covered base surface in the wastewater shaft, and is equipped for this purpose with at least one wall surface independent of the wastewater shaft.

Abstract: A wastewater-lifting system is provided. The wastewater-lifting system includes at least one bulky-material-collecting vessel for wastewater loaded with bulky materials which is guided therethrough, a liquid-collecting vessel for the wastewater which is freed from bulky materials and precleaned in the bulky-material-collecting vessel, and with a wastewater shaft for accommodating the bulky-material-collecting vessel and the liquid-collecting vessel. The liquid-collecting vessel and the wastewater shaft have at least one common wall surface. The liquid-collecting vessel defines a closed-off space with only a partially covered base surface in the wastewater shaft, and is equipped for this purpose with at least one wall surface independent of the wastewater shaft.

Abstract: A stirrer stand (10) for a submersible motor stirrer (12) composed of at least one base part (14) and a receiving part (16) for the submersible motor stirrer beyond which a guide member extends, which is used for guiding the submersible motor during assembly, the entire stirrer stand being produced from a single vibration-damping material.

Abstract: A guiding device for submersible motor agitators having a guiding tube and a sliding carriage for carrying a submersible motor agitator. The guiding tube is held in a pivotable lower mount and in an upper mount composed of a bracket and an adjusting lug, and the angular position of the guiding tube can be adjusted via the adjusting lug. The sliding carriage, the adjustment lug and any optional connecting lug are dimensioned in such a way that the sliding carriage carrying the submersible motor agitator can be removed from the guiding tube without disassembling the guiding device.

Abstract: An axially operating stirring element, preferably a propeller manufactured from sheet metal, having propeller blades arranged radially around an axis (A) and in which at least one propeller blade has a sharpened edge on the discharge or trailing edge side.

Abstract: An energy generating unit especially for installation on a bed of a stream of water or floating in the water, composed of a plurality of components, such as an inlet housing, a turbine housing, a drive unit arranged in the turbine housing, and a downstream draft tube, in which at least one component is provided with remotely operable connectors and with guides so as to be separable from at least one other component while in the water such that the at least one component, such as the drive unit, can be removed from the water for maintenance while the at least one other component, such as the draft tube, remains in the water, as well as a method for maintaining such an energy generating unit by selectively removing at least one component from the water while at least one other component remains in the water.

Abstract: A stirrer stand (10) for a submersible motor stirrer (12) composed of at least one base part (14) and a receiving part (16) for the submersible motor stirrer beyond which a guide member extends, which is used for guiding the submersible motor during assembly, the entire stirrer stand being produced from a single vibration-damping material.

Abstract: A guiding device for submersible motor agitators having a guiding tube and a sliding carriage for carrying a submersible motor agitator. The guiding tube is held in a pivotable lower mount and in an upper mount composed of a bracket and an adjusting lug, and the angular position of the guiding tube can be adjusted via the adjusting lug. The sliding carriage, the adjustment lug and any optional connecting lug are dimensioned in such a way that the sliding carriage carrying the submersible motor agitator can be removed from the guiding tube without disassembling the guiding device.

Abstract: A centrifugal pump with an impeller which has a single helically-formed blade and which is not sensitive to sand abrasion or seizing of the impeller is achieved by providing the impeller (1) with a shielding plate (3) arranged on the suction side which transitions from an axial course given at the suction inlet of the impeller into a radial course, by providing that the blade entry angle (&bgr;1) in the area which is in danger of cavitation in the event of an abrupt onset of flow is at least 5° smaller than the angle of incident flow (&bgr;0), and thereafter the blade angle &bgr; in the axial region of a meridian section through the impeller (1) increases at least to the magnitude of the blade exit angle (&bgr;2), and finally a blade angle (&bgr;) exceeding the blade exit angle (&bgr;2) in the radial area of the meridian section decreases back down to the magnitude of the blade exit angle (&bgr;2).

Abstract: An impeller of a centrifugal pump for transporting dirty liquids has transport elements, for example back-vanes or grooves disposed on the pressure side of a cover disk. The transport elements are arranged asymmetrically and are limited to one arc sector of the cover disk to create a transverse stream that rotates with the impeller. Solids which have penetrated into the space to the side of the wheel are carried out by this stream in the direction of the transport elements.