Abstract: A bore-hole pump formed of stainless steel comprises a head part and a foot part, between which one or more pump stages are incorporated. The foot part serves to connect the pump to a drive motor. The pump includes inlet openings for fluid to be delivered. The foot part consists of at least two components which are separated in one or more essentially radial planes and are formed with different manufacturing methods.

Abstract: A pump, in particular a centrifugal pump, includes at least one flow-leading part with an at least regional surface layer (50) of an elastomer. The flow-leading part with the surface layer (50) is formed as a multi-component injection moulded part, with a base structure (55) made of plastic as a first component, and with the elastomer as a second component.

Abstract: A flow-routing component of a pump is composed of at least two parts, a first part (2) of the component being manufactured by metal-powder injection molding, and a second part (4) of the component being manufactured from sheet metal. A pump assembly is also provided having such a flow-routing component.

Abstract: A pump assembly is provided with a pump (6) having one or more pump stages (10), wherein at least one of the components (12, 14) of the pump assembly, whose axial length depends on the number of pump stages (10). On at least one of its axial ends, the component has no connection configuration which is formed in the component (12, 14) itself and which is limited to the axial end. Instead, it is connected at this axial end with a friction fit and/or a positive fit to a connection element (20) which is coupled and/or connected to adjacent parts of the pump assembly, or is provided for coupling to adjacent parts of the pump assembly.

Abstract: A pump assembly has a housing formed of at least two metallic housing parts (2) and at least one diffuser (12) arranged in the housing, wherein the diffuser (12) is fixed between the two housing parts in the axial direction, and the two housing parts (2) are directly or indirectly in metallic contact with one another, in a manner such that a force transmission in the axial direction between the housing parts (2) is effected via elements of metal.

Abstract: A submersible motor is provided for the drive of a submersible pump, with a rotor (6, 10) which is mounted in the motor housing (2) via a thrust bearing (16). The thrust bearing (16) includes a stationary bearing ring (34) on whose first axial side a thrust bearing surface is situated and whose opposite second axial side (40) has a spherical curvature. The second axial side of the bearing ring (34) bears on a correspondingly spherically curved, annular abutment surface (42) of a bearing carrier (44).

Abstract: The invention relates to a differential pressure sensor array comprising a differential pressure sensor which is inserted in a receiving space in the direction of the longitudinal axis thereof. At least one sealing element that separates the receiving space into a first and a second pressure zone when the differential pressure sensor is inserted is disposed on the differential pressure sensor and/or in the receiving space. The first pressure zone is embodied entirely in an area located between a peripheral surface of the differential pressure sensor surrounding the longitudinal axis and an interior wall of the receiving space which faces said peripheral surface. At least one section of the first pressure zone extends only across a subarea of the peripheral surface in the circumferential direction. Also disclosed is an associated differential pressure sensor.

Abstract: The invention relates to an eccentric screw pump with a annular outer part (10; 40; 74) and an inner part (12; 42; 72) arranged therein, the interior of the outer part (10; 40; 74) and the exterior of the inner part (12; 42; 72) tapering in a complementary manner towards an axial end (16; 46; 70). In the axial direction (X, W), the inner part (12; 42; 72) and the outer part (10; 40; 74) are movably received in relation to each other and the inner part (12; 42; 72) and/or the outer part (10; 40; 74) are configured in such a manner that pressure applied to the pressure side of the eccentric screw pump generates a force that acts upon the inner part (12; 42; 72) axially to the direction in which the inner part (12; 42; 72) tapers and/or a force that acts upon the outer part (10; 40; 74) in an opposite axial direction.

Abstract: A method is used to determine the viscosity of a fluid. The method includes arranging a body (11) in a fluid-leading channel, with which vortices form in the flow direction (10) therebehind, which are detected with regard to measurement technology. Also, the flow speed in the channel, at which vortices arise for the first time or barely just continue to exist, is determined, and this speed is used as a measure for the viscosity of the through-flowing fluid.

Abstract: An impeller is provided for a pump unit, in particular for a waste water pump unit, having two cover plates (2, 4), which are spaced apart from one another in the axial direction (X) and are connected to one another by at least one connecting element (8). The impeller has at least one blade (12, 14) which is arranged between the two cover plates (2, 4) and extends from an inner diameter of the impeller to an outer diameter of the impeller. The blade (12, 14) has a continuous slot (16), which extends from the edge (22, 24) of the blade (12, 14) which is situated at the inner diameter to the edge (26, 28) of the blade (12, 14) which is situated at the outer diameter. A pump unit is also provided having an impeller of this type.

Abstract: A bore-hole pump has an electrical drive motor (3) and a multi-stage centrifugal pump (4) which is driven thereby. A sensor housing (9) is arranged at the end of the pump, in which one or more sensors are arranged, and which is surrounded by fluid and through which fluid flows (FIG. 1).

Abstract: A reactor includes a tubular-shaped housing in which a stack of filter plates can be rotationally arranged. The cross-sectional area of the reactor container is, in the region of the stack of filter plates, a maximum of 40% greater than the cross-sectional area of the stack of filter plates. The longitudinal extension of the reactor housing is a multiple of the longitudinal extension of the stack of filter plates, such that inside the reactor, adjacent to the stack of filter plates, additional processing devices can be arranged. The rotating stack of filter plates ensures that the entire reactor is cross-flown in an intensive manner.

Abstract: A method for data transmission between a pump assembly (2) and a control device (8) is provided, wherein the pump assembly (2) for the energy supply is connected via at least one electrical supply lead (10) to a frequency converter (14). The data transmission is effected via the electrical supply lead (10), and an evaluation of a data transmission signal (34) received by the pump assembly (2) or the control device (8) is only effected in low-disturbance regions of a carrier signal (22) formed by a supply current. A pump system designed for carrying out this method is also provided.

Abstract: A pump unit is provided having a wet-running electric motor, wherein a rotor of the pump unit can be driven by the electric motor at a maximum speed of greater than 20,000 rev/min, and the rotor is sealed off axially in the region of a suction port.

Abstract: A can of a wet-running electric motor can be produced from a non-metallic material, wherein the non-metallic material is provided with at least one additional hermetically sealing layer. A pump unit having a can of this type is also provided.

Abstract: The invention relates to a metering pump for admixing a fluid reduction agent into an exhaust gas flow, which comprises a premixing device in which the supplied reduction agent is mixed in a mixing region with a pressurized gas, wherein a first return valve is arranged in the premixing element in a supply conduit for the reduction agent, in front of the mixing region in the flow direction.

Abstract: A submersible pump unit having a wet-running electric motor and only a single impeller can be driven by the electric motor with a rotation speed greater than 20,000 rpm. The rotor of the electric motor has a diameter of less than 25 mm.

Abstract: A method produces electronic components in particular electronic sensors for pressure and differential pressure measurement. Firstly, the semiconductor structure of the electronic components is produced on a wafer. An insulating oxide layer is then applied. A protective metal layer is subsequently applied. The metal layer is applied in sections only in those regions of the wafer in which no splitting, for example by mechanical separation, occurs later. The electronic components thus formed in the wafer are then divided up into individual elements.

Abstract: A method is provided for determining the temperature of the delivery fluid of a centrifugal pump driven by a permanent magnet motor, whose rotor runs within a fluid-filled can. The rotor temperature is evaluated by way of electrical variables of the motor, and the temperature of the delivery fluid is determined by way of the rotor. This method permits sensor-free temperature measurement of the delivery fluid with a circulation pump which is driven by a permanent magnet synchronous motor.

Abstract: The invention relates to a device for treating waste water, said device comprising a closed housing (1) containing at least one stack of disks through which waste water can flow. A circulating pump is provided for pumping the fluid, said pump forming a structural unit comprising the housing (1) and the stack of disks arranged therein.