Abstract:
A metering pump aggregate has a metering chamber (16), adjoined by a positive-displacement body (14) that can be moved by a positive-displacement drive (6), as well as a controller (26) for actuating the positive-displacement drive (6). The controller (26) is designed to actuate the positive-displacement drive (6) in such a way, at least for specific setpoint conveyed flows to be generated by the metering pump, that a stroke of the positive-displacement body (14) begins with a first, elevated stroke rate (n1), and is subsequently continued at a second, lower stroke rate (n2). A method for controlling such a metering pump aggregate is also provided.
Abstract:
A multi-stage centrifugal pump assembly includes at least two impellers (2, 6) and two impeller groups (4, 8) which are consecutive in a flow direction and each with at least one impeller (2, 6). A backflow channel (24) connects an exit side of the first impeller group (4) to an entry side thereof is located in a first impeller group (4) of the two impeller groups (4, 8).
Abstract:
An electric motor includes a motor housing (1) and a further housing (6), in which electrical and/or electronic components (7) are arranged. A fluid-leading channel circuit is provided for cooling these components (7) and conductively connects the inside of the motor hosing (1) to the inside of the further housing (6).
Abstract:
A heat circulation pump includes a pump housing (1) with a pump impeller driven by an electric motor. The electric motor is arranged in a motor housing (8) connected to the pump housing (1). A plastic terminal box (12) is fixed to the motor housing (8) and houses electric and/or electronic components of the engine control and electrically connects the motor, a ground contact arranged on the motor housing (8), and a plug or a socket (34) arranged on the outside of the terminal box (12). The ground contact arranged on the motor housing is connected in an electrically conductive manner to a ground contact of the plug or socket (34) and to at least one conductor inside the terminal box (12). The electric connection between the ground contact arranged on the motor housing (8) and the ground contact of the plug or socket (34) is arranged outside of the terminal box (12).
Abstract:
A monitoring system (2) for monitoring the number and/or concentration of particles and/or micro organisms (12, 22) in a fluid (10). The monitoring system (2) generates an alarm if a predefined criterion is met. The monitoring system (2) includes a micro processer (6) which executes programmed instructions in order to identify and classify particles (12), a storage member (8), and an optical sensor member (40) having a 2-D optical sensor (4) and a light source (36). The optical sensor member (40) records an image of a part of the fluid (10) and the monitoring system (2) determines the number and/or concentration of particles (12) in the fluid (10) on the basis of the optical response of single particles (12) in a sample zone (38) in the fluid (10). The fluid (10) in the sample zone (38) is kept stationary relative to the optical sensor member (40) during the image recording.
Abstract:
An impeller (2) for a centrifugal pump includes a first shroud having a plurality of blades (8). A second shroud is joined onto the first shroud by way of welding. Each blade (8) has an apex region (12), at which the blade contacts the second shroud. At least one of the blades (8) in a first section (20) of the apex region (12) has a weld connection to the second shroud, and in at least one second section (14) of the apex region (12) is free of a weld connection.
Abstract:
A rotor can for a wet running electric motor includes an inner layer (2) made from a thermoplastic material which is at least partly surrounded by a supporting layer (4) in form of a thermoplastic tape layer attached to the outside of the inner layer (2).
Abstract:
A terminal box (45) for electrical connection to an electric motor (32), in particular of a circulation pump (10), includes at least one wall (215) and at least one circuit board (145), wherein the terminal box (45) on the wall (215) includes at least one electrical contact (220) for connection to the circuit board (145), said contact designed as a clamping element (220) for releasably clamping the circuit board (145) which is orientated with its flat sides (150, 152) perpendicularly to this wall (215). A terminal box system includes at least two different circuit boards (145, 145′) selectively insertable into the at least one clamping element (220) of the terminal box (45) and/or at least two different covers (105, 105′) selectively connectable to a housing part (100) of the terminal box (45). A pump assembly (5) includes such a terminal box (45) or such a terminal box system.
Abstract:
A method for determining characteristic values of an electrometrically driven centrifugal pump assembly with a speed controller, said assembly being integrated in an installation, includes determining characteristic values by way of electrical variables of the motor and of the pressure produced by the pump, with which one successively runs to at least two different operating points of the pump. Delivery rates are determined in the installation at the run-to operating points, and the characteristic values are determined based on the delivery rates.
Abstract:
The method for activating an asynchronous motor comprising at least two windings is provided, in order, for the purpose of a change in the rotational speed, to connect a first winding and at least one second winding by way of at least two electronic switches. On switching, both switches are opened for one or more time intervals in order to avoid current peaks.