Connecting device for tubes and guide ring with forced circulation in potential retention areas

A connection device for at least one tube end so as to convey a fluid flow, the device comprising a body defining a channel having at least one tube end reception segment, the reception segment being provided with an annular sealing element arranged to surround the tube end while leaving a portion of the tube end projecting from the sealing element towards an end of the segment, the device being characterized in that centering means for the projecting portion are arranged in a zone extending between the outer surface of the projecting portion, a facing surface of the segment, and the sealing element, and in that the centering means include positioning elements that are arranged to co-operate with a surface of the segment and an outer surface of the projecting portion and to define at least one sweeping duct for sweeping the zone, the duct having at least one inlet in the vicinity of which there extends at least one deflector arranged to insert, into the sweeping duct, fluid diverted from the flow traveling through the device, and at least one outlet for returning the fluid that has passed through the sweeping duct back to the flow.