Abstract: A wheel of a rotating machine for a fluid includes blades that project on the front surface thereof. On one portion of the front surface which is at least 70% of the diametrical range that defines the blade installation area, the front surface is tangential to a cone, the tip of which is pointed forward and the vertex angle of which is between 154° and 170°. A rotating machine and a turbocompressor that includes such a wheel are described.

Abstract: A centrifugal gas compressor or pump comprising a body, a wheel rotatably mounted within the body around a wheel axis, the wheel comprising a hub, a set of blades fastened to the hub, the body comprising a diffuser placed on the periphery of the wheel and a fluid intake placed facing the hub, the blades comprising a first edge facing the intake and a second edge facing the diffuser so that a fluid travels from the intake to the diffuser, the second edges being located inside a blade-enveloping cylinder centred on the wheel axis. The wheel comprises a toothed ring fastened to the wheel, which extends radially past the enveloping cylinder to form a diffuser wall.