Centrifugal gas compressor or pump comprising a toothed ring and a cowl

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.

1 . A centrifugal gas compressor or pump comprising a body, a wheel rotatively mounted in the body around a wheel axis the wheel comprising a hub, a set of blades in attached to the hub, the body comprising as diffuser placed on the periphery of the wheel and a fluid intake placed opposite the hub, the blades comprising as first edge opposite the intake and a second edge opposite the diffuser so that a fluid circulates from the intake to the diffuser, the second edges being located inside a blade-enveloping cylinder centered on the wheel axis, wherein the wheel comprises at least one ring, attached to the wheel and which extends radially beyond the blade-enveloping cylinder to form a wall of the diffuser. 
     
     
         2 . A compressor or pump according to  claim 1 , wherein the body comprises a volute around the diffuser. 
     
     
         3 . A compressor or pump according to  claim 2 , wherein the ring is inserted with play into a bore of the compressor body and is placed in such a way that its diffuser side face is in the same plane as the wall of the volute at this level. 
     
     
         4 . A compressor or pump according to  claim 1 , wherein the ring extends from the hub. 
     
     
         5 . A compressor or pump according to  claim 1 , wherein the wheel comprises as cowl attached to the blades. 
     
     
         6 . A compressor or pump according to  claim 5 , wherein the ring extends from the cowl. 
     
     
         7 . A compressor or pump according to  claim 4 , wherein the cowl and the blades are in one piece. 
     
     
         8 . A compressor or pump according to  claim 4 , wherein the ring forms one piece with the wheel extending from the hub.