Abstract: The method serves for monitoring an energy conversion device such as for example a pump assembly, a compressor or likewise. The energy conversion device consists of several function units which are functionally linked to one another. Power-dependent variables of at least one function unit are automatically detected in temporal intervals and/or computed and compared to one another or values derived therefrom and/or to predefined values. A corresponding signal is produced in dependence of this comparison, via which signal, the efficiency reduction of a function unit or the complete device may be specified.

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: A bearing arrangement of a shaft (2) is provided, with which an annular bearing sleeve (4) is applied onto the shaft (2). The bearing sleeve (4), for axial fixation, bears with at least one axial end (8, 10) on a retaining sleeve (6) applied onto the shaft (2). The retaining sleeve (6), at least at one axial end (15, 16), has a greater wall thickness than in its axial middle region (18).

Abstract: A rotor (2) provided for a canned motor of a wet-running centrifugal pump forms the shaft for the drive of the impeller (7) and includes at least one permanent magnet (12) which is encapsulated in a fluid-tight manner. The peripheral part of the encapsulation in the region of the at least one permanent magnet (12) forms the rotor shaft.

Abstract: A submersible motor is provided for a submersible pump, the motor being configured as a single-phase asynchronous motor, which includes a main winding (6), an auxiliary winding (8), and a starting device (10, 14, 16, 18, 20, 22) for controlling the starting procedure of the submersible motor. The starting device (10, 14, 16, 20, 22) for the control of the current feed of the auxiliary winding (8) includes at least one electronic switch (20) in the circuit of the auxiliary winding (8).

Abstract: The invention relates to a two-phase permanent magnet motor which is controlled by a frequency converter. The frequency converter is advantageously provided with a three-phase inverter having six switches that are controlled in such a manner as to minimize switching losses.

Abstract: A Moineau pump or Moineau compressor includes a conically designed inner (4) and a conically designed outer (8) element, whose longitudinal axes (X1, X2) run at an angle to one another and intersect at a point. The pump or compressor has at least two sections (2a, 2b, 2c, 2d) in the axial direction. A part (4b) of the inner element (4) located in a second section (2b) is arranged rotated with respect to a part (4a) of the inner element located in a first section (2a) about the longitudinal axis (X1) of the inner element (4). A part (8b) of the outer element (8) located in the second section (2b) is arranged rotated with respect to an other part (8a) of the outer element (8) located in the first section (2a) about the longitudinal axis (X2) of the outer element (8).

Abstract: A method for testing a working memory which includes a matrix of memory cells, an address bus/address coder and a write circuit/read circuit, consists of two method parts with which in one step, at least a part of the address bus/address coder is tested with regard to address faults and in another step at least a part of the memory cells are tested with regard to cell faults. The testing steps are temporally independent of one another and may thus be effected also during the operation.

Abstract: A magnetic drive arrangement includes a multitude of permanent magnets (13) which are arranged along the periphery of a housing wall (15), wherein the magnets (13) are held with a non-positive fit by the housing wall (15) and bear on this. The manufacturing effort is simplified by way of the above-identified arrangement. One may advantageously apply parallelepiped magnets (13) as well.

Abstract: With the multi-stage centrifugal pump assembly, the connection between the motor shaft (7) and the pump shaft (9) is effected by way of a thread (26, 27), which joins the fits (31, 34) lying therebehind, between a pocket hole bore (24) in the pump-side end of the motor shaft (7) and the motor-side end of the pump shaft (9). Thereby, a transition fit (32) is provided in the region of the bearing (11), and a press fit 34 in the free region therebehind.

Abstract: An axial face seal (13), which seals a pump housing in the region of the pump shaft (12), is constructed in an axially compact manner. Spring holders (24, 25), which transmit the required pressing force of a compression spring (23), are connected to one another with a positive fit in a rotation direction, and hold a rotating axial face seal ring (19) in a rotationally fixed manner to the pump shaft (12). The spring holders (24, 25) are compact and enclose an abutment ring (33) for pump impellers as well as the compression spring (23). A motor-side spring (24) engages over the rotating axial face seal ring (19), by which an axially extremely short constructional length is achieved.

Abstract: A multi-stage centrifugal pump assembly which is manufactured in the same construction type with cast components on the one hand, and with a stainless steel lining formed of sheet metal on the other hand, includes a bearing carrier (13) which is designed and suitable for the connection of a cast housing component (12) as well as for receiving a sheet metal lining made of stainless steel.

Abstract: The invention relates to a method of controlling the transferral of heat, substance, radiation or the like to or from at least a first fluid in a device. The device comprises a stage with a transferring element (2) and a rotatable impeller (3), the impeller being arranged so that the first fluid flowing out of the impeller flows along a surface of the transferring element (2). The flow of the first fluid along the surface of the transferring element comprises a spiralling flow pattern having a radial velocity component (Vr) and a tangential velocity component (Vt), the device further comprises one or more throttling means for throttling the flow of the first fluid through the device.

Abstract: The filter device is provided with a housing (1) and with a stack of filter plates (10, 11) arranged therein at a spacing from one another. The housing includes an inlet (7) for the fluid to be filtered, an outlet (9) for the filtrate which is connected in a conducting manner to the inside of the filter plates (10, 11), and a cavity extending through the stack and formed by recesses in the filter plates (10, 11). The filter plate stack is arranged fixed to the housing, and a centrifugal pump (14) with several impellers (15) is arranged within the filter plate stack. This pump ensures an intensive through-flow of the filter plate stack and thus a removal of the filter residues.

Abstract: A pump assembly with an electric motor includes a stator having an iron core (16) and windings arranged thereon and being arranged in a stator housing surrounding the electric motor to the outside. The stator housing (6) is formed as a cast component, into which the iron core (16) is cast, and the windings have been deposited on the iron core (16) after the casting of the iron core (16) into the stator housing (6).

Abstract: A modular pump assembly has a volute (16), having a suction chamber (120) and a pressure chamber (122), and a pump stack (14) having at least one stage (86), wherein a modular flange (44) is arranged between the volute (16) and the pump stack (14) and is removably coupled to both the pump stack (14) and the volute (16).

Abstract: A pump unit includes an electric motor, located in a stator housing (6), a terminal box being arranged on an axial face of the stator housing (6). The terminal box (12) includes a tubular housing element (44) having a first axial face to which the axial face of the stator housing (6) is connected. An opposite second axial face (46) of the tubular housing element (44) is closed by at least one cover element (40) into which operating and/or display elements (38) are integrated. An electrical connecting element (42) is arranged on the outer periphery of the tubular housing element (44).

Abstract: A method is provided for detecting faults in a pump assembly having an electric motor, or faults in an electric motor, having at least one rotating shaft. A vibration signal is detected, the detected vibration signal is processed in a manner such that the influence of the current rotational speed of the shaft is eliminated, periodic signals are filtered out of the processed vibration signal, and the vibrational operating condition, in particular possible faults, is recognized by way of the periodic signals. Further, a pump assembly having an electric motor or an electric motor is provided in which this method is applied.

Abstract: A device is provided for treating waste water, the device including a closed housing containing at least one stack of disks through which waste water can flow. A circulating pump is provided for pumping the fluid, the pump forming a structural unit including the housing and the stack of disks arranged therein.

Abstract: The semiconductor component is intended for a sensor, in particular for a pressure sensor or differential pressure sensor, and includes a semiconductor substrate (1) in or on which electronic components (3) are formed and connected. The semiconductor substrate (1) is provided with an electrically insulated layer, and a metal-containing amorphous protective layer is formed from two metal-containing layers which have different chemical compositions and are vapor-deposited in succession.