Coupling between a centrifugal fan and the suction inlet thereof

Abstract

The invention relates to a coupling between a centrifugal fan and the suction inlet thereof, comprising a suction inlet ( 1 ) defining an opening ( 2 ) for the passage of a flow of fluid under suction and a rotatably mounted centrifugal suctioning fan ( 3 ). A closure coupling is formed around the opening ( 2 ), between said centrifugal fan ( 3 ) and the suction inlet ( 1 ), by means of fitting together flanges ( 7 ) of the centrifugal fan ( 3 ) and flanges ( 8 ) of the suction inlet ( 1 ), which flanges define therebetween a labyrinthine passage that obstructs the ingress of an air disturbing flow through the coupling.

1 . A coupling between a centrifugal fan and the suction inlet thereof, comprising a suction inlet defining an opening for the passage of a flow of fluid (A) and a centrifugal fan rotatably mounted with respect to said suction inlet for driving the flow of fluid (A), a closure coupling being formed around the opening, between the centrifugal fan and the suction inlet, by means of respective concentric flanges between which there is play for freedom of rotation of the centrifugal fan, characterized in that the closure coupling around the opening fits together flanges of the centrifugal fan and flanges of the suction inlet, which flanges define therebetween a labyrinthine passage that obstructs the ingress of disturbing flow (B) through the coupling. 
     
     
         2 . The coupling between a centrifugal fan and the suction inlet thereof according to  claim 1 , wherein the closure coupling around the opening is defined by means of flanges of the centrifugal fan and flanges of the suction inlet, fitting them together in the axial direction of suction of the flow of fluid (A). 
     
     
         3 . The coupling between a centrifugal fan and the suction inlet thereof according to  claim 1 , wherein the closure coupling around the opening is defined by means of flanges of the centrifugal fan and flanges of the suction inlet, fitting them together in the radial direction of suction of the flow of fluid (A). 
     
     
         4 . The coupling between a centrifugal fan and the suction inlet thereof according to  claim 1 , wherein a filler with a soft moldable material is included in the labyrinthine passage defining the fitting together of flanges of the centrifugal fan and flanges of the suction inlet.