An air outlet unit for a large blower assembly

F - Mech Eng,Light,Heat,Weapons – 04 – D

Patent

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Details

F04D 29/44 (2006.01) F04D 29/54 (2006.01)

Patent

CA 2449779

An air outlet unit (101) for a large blower assembly comprising an outlet tube member (103) with an upstream inner end in flow communication with the pressure side of an impeller of the blower asembly and a downstream outer end for connection with a duct and a mainly cylindrical inner tube member (105) arranged coaxially to the outlet tube member (103) and having an inner end substantially aligned with the inner end of the outlet tube member (103) and a downstream outer end, the inner tube member (105) being closed by a closing means (106). The inner tube member (105) has an open downstream end 8114) projecting in the downstream direction beyond th edownstream outer end of the outlet tube member (103) to thereby achieve a reduced pressure loss and a more uniform velocity profile.

L'invention concerne une unité de sortie d'air (101) pour un grand ensemble ventilateur. Cette unité comprend un élément de tuyau d'évacuation (103) pourvu d'une extrémité intérieure amont en communication fluidique avec le côté pression d'une turbine de l'ensemble ventilateur et une extrémité extérieure aval destinée à être connectée à une conduite et un élément de tuyau intérieur essentiellement cylindrique (105) arrangé coaxialement par rapport à l'élément de tuyau d'évacuation (103) et présentant une extrémité intérieure sensiblement alignée sur l'extrémité intérieure de l'élément de tuyau d'évacuation (103) et une extrémité extérieure aval, l'élément de tuyau intérieur (105) étant fermé par un dispositif de fermeture (106). L'élément de tuyau intérieur (105) est pourvu d'une extrémité aval ouverte (114) qui se projette dans la direction aval et dépasse l'extrémité extérieure aval de l'élément de tuyau d'évacuation (103) afin de réduire les pertes de pression et d'uniformiser davantage le profil de vitesse.

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