Fume hood exhaust terminal

B - Operations – Transporting – 08 – B

Patent

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Details

B08B 15/02 (2006.01) G05D 7/06 (2006.01)

Patent

CA 2147338

A fume hood exhaust terminal for monitoring and controlling gas flow in a duct system includes a tubular duct segment having an upstream end, a downstream end, and an inner periphery, as well as an annular ring secured to the inner periphery between the upstream and downstream ends. A differential pressure transmitter device is disposed on the duct segment for measuring the pressure differential across the ring and for generating a corresponding flow signal. A damper is disposed in the duct segment between the differential pressure measuring device and the downstream end, and an actuator is located on the duct segment to be responsive to the signal generated by the differential pressure transmitter device and connected to the damper for selectively controlling the position of the damper in the duct segment to maintain a specified gas flow.

La section terminale d'un exhausteur de fumées pour contrôler et régler el débit de gaz dans un système de conduits comprend un segment de conduit tubulaire qui a un bout amont, un bout aval et une périphérie intérieure, de même qu'un anneau fixé à la périphérie intérieure entre le bout amont et le bout aval. Un dispositif transmetteur de différence de pression est posé sur le segment de conduit pour mesurer la différence de pression d'un bord à l'autre de l'anneau et générer un signal de débit correspondant. Un registre est placé dans le segment de conduit entre le dispositif de mesure de différence de pression et le bout aval, et un actionneur se trouve sur le segment de conduit pour réagir au signal généré par le dispositif transmetteur de différence de pression et il est raccordé au registre dans le segment de conduit pour maintenir un débit de gaz spécifié.

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