System for controlling flow through a process region

G - Physics – 05 – D

Patent

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G05D 7/00 (2006.01) B08B 15/02 (2006.01) F16L 55/04 (2006.01) F24F 3/16 (2006.01) F24F 11/047 (2006.01) F24F 13/12 (2006.01) F24F 13/14 (2006.01) G05D 7/01 (2006.01) G05D 16/10 (2006.01) G05D 16/20 (2006.01)

Patent

CA 2145651

A regulator for maintaining a constant partial vacuum in a region includes a path, through which fluid passes from the region to a vacuum source, and a piston (2) movably mounted at a constriction point (30). The piston has a frontal face (15), exposed to fluid in the path upstream of the constriction point (30). A piston distal face (16), exposed to a reference pressure, such as the pressure of region and piston weight tends to widen the path at the constriction point (30). A force is exerted on the piston by a spring (21) under compression, in a direction that tends to narrow the path at the constriction point. A buffering gas, introduced to the area between the piston's skirt (29) and the piston mounting structure (65), may be used to keep fumes from backing up into the region and/or to provide a bearing.

Un régulateur conçu pour maintenir un vide partiel constant dans une certaine région comprend une voie d'écoulement dans laquelle un fluide se déplace de ladite région vers une source de vide, et un piston monté mobile en un point de rétrécissement (30). Le piston présente une face frontale (15) exposée au fluide dans la voie d'écoulement, en amont du point d'étranglement (30). Une face distale (16) du piston qui est soumise à une pression de référence telle que la pression de la région et le poids du piston, élargit la voie d'écoulement au niveau du point d'étranglement (30). Un effort est exercé sur le piston par un ressort (21) en compression, dans un sens qui tend à rétrécir la voie d'écoulement au niveau du point d'étranglement. Un gaz tampon introduit dans la zone entre la jupe (29) du piston et la structure de montage (65) de ce dernier peut être utilisé pour empêcher les fumées de remonter dans la région et/ou pour former un coussinet de gaz.

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