Fume hood exhaust terminal having an electrically driven...

Details Fume hood exhaust terminal having an electrically driven... Fume hood exhaust terminal having an electrically driven...

B - Operations, Transporting

08

B

B08B 15/02 (2006.01) B08B 5/00 (2006.01) F24F 11/04 (2006.01) F24F 13/14 (2006.01)

Patent

CA 2214819

A fume hood exhaust terminal for controlling gas flow in an exhaust duct has an electrically driven linear actuator for angularly positioning a damper in the terminal. Drive circuitry employed in the preferred embodiment prevents the possibility of shorting out the actuator motor in the event of an input signal condition which would attempt to operate the motor in two directions simultaneously. The circuit also includes a power failure detection circuit which includes the capability of storing sufficient power to place the damper in a preferred position until power is restored to the exhaust terminal.

Un terminal d'évacuation de hotte d'aspiration pour contrôler le débit de gaz dans un conduit d'évacuation est doté d'un actionneur linéaire à commande électrique pour le positionnement angulaire d'un registre dans le terminal. Le circuit de commande utilisé dans l'application préférée prévient la possibilité de court-circuitage du moteur de l'actionneur dans l'éventualité de signaux d'entrée qui tenteraient de faire fonctionner le moteur dans deux sens en même temps. Le circuit comprend aussi un circuit de détection de panne d'alimentation qui comporte la capacité d'emmagasiner suffisamment d'énergie pour placer le registre dans une position préférée jusqu'à ce que le terminal d'évacuation soit à nouveau alimenté.

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