The invention is based on a pump apparatus, in particular a magnetic coupling pump apparatus, having a rotor shaft (16), having a pump impeller (22) which is securely connected to the rotor shaft (16), having at least one axial bearing (18) which rotatably supports the rotor shaft (16) at a side facing the pump impeller (22), having a magnetic pump stator (42), having a magnetic pump rotor (44) which is connected to the rotor shaft (16) in a rotationally secure manner, having a containment can (30) which extends between the magnetic pump stator (42) and the magnetic pump rotor (44) and which at least partially closes a central pump space (28), and having at least one central support element (32) which is mounted in the region of the pump impeller (22) in a rotationally secure manner.

It is proposed that the pump apparatus (1) have an elastomer disk (36) which is arranged between the support element (32) and the axial bearing (18) and that the magnetic pump stator (42) and the magnetic pump rotor (44) be arranged with an axial offset (X) with respect to each other, wherein the magnetic pump stator (42) and the magnetic pump rotor (44) are provided as a result of the axial offset (X) to produce an axial force F(ax, mag) in the direction of the elastomer disk (36).

The invention relates to a propeller arrangement (1) having a propeller part (2) and a shaft part (3), in particular for an underwater vacuum cleaner, wherein the propeller part (2) and the shaft part (3) are coaxially connected to one another via a latching connection (4), which latching connection (4) has at least two latching fingers (5) which can move elastically in a latching direction (R) radially with respect to an axis of rotation (1a) of the propeller arrangement (1), and a latching opening (6) for accommodating the latching fingers (5). The latching fingers (5) are formed integrally with the shaft part (3). The latching fingers (5) and the latching opening (6) form—in and/or against a direction of rotation (P) of the propeller arrangement (1) —a positive connection. This enables an easily detachable rotary connection between the propeller part (2) and the shaft part (3) in a simple manner.

A canned motor device includes a motor unit that includes an inner rotor having a plurality of engaging grooves and a plurality of protrusions, and an impeller having a plurality of engaging hooks and a plurality of inner grooves. Each of the protrusions has at least one lateral protrusion surface. Each of the inner grooves is defined by a main groove surface, two lateral groove surfaces and a groove end surface. When the engaging hooks respectively engage the engaging groove, the protrusions respectively engage the inner grooves in a manner that the at least one lateral protrusion surface of each of the protrusions urges one of the lateral groove surfaces of the respective one of the inner grooves.

A blower motor is provided and includes a support assembly provided with a first stop step surface, a stator assembly disposed in the support assembly, a rotor assembly disposed in the stator assembly and an end cover disposed on the stator assembly and abutted against the support assembly and provided with a second stop step surface. The rotor assembly includes a rotating shaft and two ends of the rotating shaft are respectively provided with a first bearing and a second bearing. A resilient gasket is provided on one of the first stop step surface and the second stop step surface. The bearings are positioned by springs and cooperate with the resilient gasket to apply a tightening force to the bearings, which can reduce clearances in the bearings and effectively prevent balls in the bearings from making noise under a high-frequency vibration.

A blower motor is provided and includes a support assembly provided with a first stop step surface, a stator assembly disposed in the support assembly, a rotor assembly disposed in the stator assembly and an end cover disposed on the stator assembly and abutted against the support assembly and provided with a second stop step surface. The rotor assembly includes a rotating shaft and two ends of the rotating shaft are respectively provided with a first bearing and a second bearing. A resilient gasket is provided on one of the first stop step surface and the second stop step surface. The bearings are positioned by springs and cooperate with the resilient gasket to apply a tightening force to the bearings, which can reduce clearances in the bearings and effectively prevent balls in the bearings from making noise under a high-frequency vibration.

A rotor assembly being an injection molded piece, and comprising a first shaft sleeve and a rotor; a first injection molded body is formed by using the rotor and the first shaft sleeve as injection molding inserts to pass through injection molding; a second injection molded body is formed by at least using the first injection molded body as an injection molding insert to pass through injection molding; the second injection molded body comprises a lower cover plate and a wrapping layer, the wrapping layer wrapping around at least a portion of the outer peripheral surface of the first injection molded body; the rotor assembly further comprises blades, the blades being fixedly connected to the lower cover plate or the blades forming an integrated structure with the lower cover plate.

The invention relates to a propeller arrangement (1) having a propeller part (2) and a shaft part (3), in particular for an underwater vacuum cleaner, wherein the propeller part (2) and the shaft part (3) are coaxially connected to one another via a latching connection (4), which latching connection (4) has at least two latching fingers (5) which can move elastically in a latching direction (R) radially with respect to an axis of rotation (1a) of the propeller arrangement (1), and a latching opening (6) for accommodating the latching fingers (5).

The latching fingers (5) are formed integrally with the shaft part (3). The latching fingers (5) and the latching opening (6) form—in and/or against a direction of rotation (P) of the propeller arrangement (1)—a positive connection. This enables an easily detachable rotary connection between the propeller part (2) and the shaft part (3) in a simple manner.

A pump shaft for a multi-stage pump, in particular a centrifugal pump, includes a peripheral groove region for the engagement of a relief device in order to introduce a force acting in the axial direction of the pump shaft. The groove region includes a plurality of grooves which are spaced apart in the axial direction.

A rotary machine includes a cylindrical rotary shaft extending in a direction of an axis, a fastening bolt having a bolt body that extends in a direction of an axis O in the rotary shaft to form fastening portions at both ends, a pair of rotary bodies each having an end portion in the direction of the axis that is fixed to each of the pair of fastening portions to be in contact with an end surface of the rotary shaft in the direction of the axis, and a bolt extension mechanism that temporarily extends the bolt body in the direction of the axis.

A rotary machine includes a cylindrical rotary shaft extending in a direction of an axis, a fastening bolt having a bolt body that extends in a direction of an axis O in the rotary shaft to form fastening portions at both ends, a pair of rotary bodies each having an end portion in the direction of the axis that is fixed to each of the pair of fastening portions to be in contact with an end surface of the rotary shaft in the direction of the axis, and a bolt extension mechanism that temporarily extends the bolt body in the direction of the axis.