In-line venturi

G - Physics – 05 – D

Patent

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Details

G05D 11/03 (2006.01) F15D 1/02 (2006.01) G05D 7/00 (2006.01)

Patent

CA 2204354

A plate (10) supports a venturi (11) within a conduit (20) and divides the fluid flow stream into a first stream which flows through the venturi tube (11) and a second stream which bypasses the venturi tube (11). A variety of adjusting mechanisms are disclosed for varying the cross-sectional area of the bypass flow. The apparatus is adapted to allow the back pressure within the venturi tube (11) to force an increasing proportion of the flow stream to bypass the venturi tube (11) in order to maintain a relatively constant aspiration rate within the venturi tube. The adjustment mechanisms disclosed include a second plate (12), similar to the first plate (10), which is manually rotated and a blocking ring (60) which moves responsive to changes in rate of flow of the fluid flow stream. Helical passages (605) may also be provided at the outlet to promote mixing.

Une plaque (10) supporte un venturi (11) dans un conduit (20) et divise l'écoulement d'un fluide en un premier flux traversant le tube de venturi (11) et en un deuxième flux qui contourne ce tube. On décrit divers mécanismes de réglage permettant de faire varier la superficie de section du flux de contournement. Cet appareil est conçu pour permettre à une contre-pression présente dans le tube de venturi (11) de forcer une partie croissante de l'écoulement de fluide à contourner le tube de venturi (11) pour maintenir un taux d'aspiration relativement constant dans ce tube. Les mécanismes de réglage décrits incluent une deuxième plaque (12), similaire à la première (10) et à rotation manuelle, et un anneau de blocage (60) qui se déplace en fonction des changements intervenant dans le débit d'écoulement du fluide. Des passages de forme hélicoïdale (605) peuvent également être prévus à la sortie pour favoriser le mélange.

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