In this impeller wheel, the impeller cage is also designed as an auxiliary impeller wheel (10), and the axial length of the blades (11) of the auxiliary impeller wheel (10) significantly exceeds the length of the blades (6) of the impeller wheel (1).

The centrifugal wheel (19) is aligned with the endless screw (18).

A blower device composed of a centrifugal impeller (1) and a fan casing (2) having a suction opening (3) facing the centrifugal impeller (1).

The device (1) disclosed comprises a driven thrower wheel (8) with scoop blades (10).

Additionally the impeller itself may be housed within an impeller housing that is mechanically coupled to the bearing housing in order to enhance dimensional stability therebetween.

A blower device comprises a centrifugal impeller (24) provided within a casing (14) and also comprises an electric motor (21) for driving the centrifugal impeller (24).

Because better kinetic energy transfer from the thrower wheel to the fuel also occurs by the reduction of the impacts, the rotational speed of the thrower wheel can be reduced.

The cell comprises a centrifugal or helico‑centrifugal impeller (22A, 22B) comprising a gas intake opening and gas discharge openings.

A compressor centrifugal impeller (2) is mounted inside the compressor housing (1).

A centrifugal impeller is attached to the shaft and has an opening for fluid intake.

The impeller assembly includes an impeller plate (52), a hub (60) fixedly connected to the impeller plate, and a plurality of fan blades (70) each having first and second ends and first and second sides.

Each second end (72) extends to the outer periphery of the impeller plate.

A diffuser is disposed corresponding to the centrifugal impeller to form a pump stage.

Guide blades (9) are arranged between the blades (6) of the impeller wheel (1) and their inner flanks are further from the centre of the impeller wheel (1) than the flanks of the blades (6).

The flat section (26) is formed parallel to the upper end surface of the centrifugal impeller (24).