Adjustable orifice plate for exhaust ducts

F - Mech Eng,Light,Heat,Weapons – 24 – C

Patent

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Details

F24C 1/14 (2006.01) F24C 15/00 (2006.01) F24C 15/32 (2006.01) F26B 23/02 (2006.01) F26B 25/00 (2006.01)

Patent

CA 2491255

An exhaust duct orifice adjustment device for a gas-fired heater used to indirectly heat an oven communicating with a heat exchanger, wherein the exhaust duct includes a fixed annular orifice plate and a switch having a pressure sensor on opposed sides of the fixed orifice plate, turning off the burner if the pressure drop falls below a predetermined minimum. The orifice adjustment mechanism includes a moveable plate upstream of the fixed orifice plate having an opening communicating with the opening in the fixed orifice plate and an adjustment mechanism moving the orifice adjustment plate from a retracted position, wherein the opening through the fixed orifice plate is substantially unobstructed, to an extended position which restricts the opening through the fixed orifice plate, thereby adjusting the pressure drop.

La présente invention se rapporte à un dispositif de réglage de l'orifice d'un conduit d'échappement destiné à un équipement de chauffage au gaz utilisé pour chauffer indirectement un four communiquant avec un échangeur de chaleur, ledit conduit d'échappement comportant un diaphragme annulaire fixe et un élément de commutation possédant un capteur de pression sur les cotés opposés du diaphragme fixe, le brûleur étant éteint lorsque la pression tombe en dessous d'un minimum préétabli. Le mécanisme de réglage de l'orifice comprend une plaque mobile située en amont du diaphragme fixe ayant une ouverture communicant avec l'ouverture du diaphragme fixe et un mécanisme de réglage déplaçant le diaphragme de réglage à partir d'une position de retrait, l'ouverture dans le diaphragme fixe étant sensiblement non obstruée, jusqu'à une position d'extension qui limite l'ouverture dans le diaphragme fixe, ceci permettant le réglage de la chute de pression.

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