Abstract: A multistage centrifugal pump includes a foot part (1) and a head part (7), between which several pump stages are arranged. Each of the pump stages includes an impeller (4) and a housing (5) surrounding the impeller (4). The housings (5) are arranged over one another. The housings (5) together with an outer casing (9) form an annular channel (8). The housings (5) together with an outer casing (9) are clamped via clamping bolts (11) which are fastened on the head part (7) and the foot part (1). The clamping bolts (11) are arranged within the annular channel (8).

Abstract: A pump assembly with an electric motor which includes a stator housing (6) and an electronics housing (4; 50) fastened at the outside on the stator housing (6). The electronics housing (4; 50) is connected to the stator housing (6) via at least one fastening element (24, 24?; 56). The fastening element is situated within an outer contour of the electronics housing (4; 50) which is delimited by the outer walls of the electronics housing (4; 50) and is accessible even with a closed electronics housing (4; 50).

Abstract: A multistage centrifugal pump includes a foot part (1) and a head part (7), between which several pump stages are arranged. Each of the pump stages includes an impeller (4) and a housing (5) surrounding the impeller (4). The housings (5) are arranged over one another. The housings (5) together with an outer casing (9) form an annular channel (8). The housings (5) together with an outer casing (9) are clamped via clamping bolts (11) which are fastened on the head part (7) and the foot part (1). The clamping bolts (11) are arranged within the annular channel (8).

Abstract: A pump assembly with an electric motor which includes a stator housing (6) and an electronics housing (4; 50) fastened at the outside on the stator housing (6). The electronics housing (4; 50) is connected to the stator housing (6) via at least one fastening element (24,24?; 56). The fastening element is situated within an outer contour of the electronics housing (4; 50) which is delimited by the outer walls of the electronics housing (4; 50) and is accessible even with a closed electronics housing (4; 50).

Abstract: A centrifugal pump assembly with at least one impeller (8) and with a thrust bearing (44) which includes a rotating (50) and a stationary (48) bearing part. The rotating (50) as well as the stationary (48) bearing part are designed in a self-aligning manner.

Abstract: A centrifugal pump assembly with at least one impeller (8) and with a thrust bearing (44) which includes a rotating (50) and a stationary (48) bearing part. The rotating (50) as well as the stationary (48) bearing part are designed in a self-aligning manner.

Abstract: A refrigerant pump assembly includes a drive motor (2) and a centrifugal pump (4). The centrifugal pump (4) is surrounded by a tubular container (18) which with a first axial end is sealingly connected to a motor housing of the drive motor (2) and at an opposite axial end (20) is designed in a closed manner.

Abstract: The invention relates to a frequency converter supplied electric motor comprising a cooling air blower, the cooling air of which for cooling the motor is guided along cooling ribs which are arranged on the motor housing. The frequency converter is arranged in a housing which is detachably connected to the motor housing and which comprises a first heat conducting housing part and at least a further housing part. The first housing part of the frequency converter housing forms the fan cowl and comprises a transverse wall which is provided and formed for the heat conducting connection to the heat producing components of the power circuit of the frequency converter. The first housing part is formed ribbed and openings in the hosing wall are provided in the footwell of the cooling ribs as air inlet openings for the cooling air stream. Moreover there is provided a further housing part which connects to the first housing part and has a purely accomodating function.