F - Mech Eng,Light,Heat,Weapons – 27 – D
Patent
F - Mech Eng,Light,Heat,Weapons
27
D
126/15
F27D 7/00 (2006.01)
Patent
CA 1112966
P-305a RECIRCULATING PROCESSING OVEN HEATER ABSTRACT OF THE DISCLOSURE A recirculating processing oven heater including a direct fired burner for heating processing gas for delivery to an asso- ciated processing oven. A housing of the heater defines first and second parallel paths along which the gas flows between an inlet and an outlet thereof with the burner located along the first path to heat gas flowing therealong. The housing also de- fines a junction of the two paths downstream from the burner. The relative mass flow rates of gas flowing along the first and second paths is adjustable by a control valve mechanism including first and second adjustable valves at the inlet of the heater housing. Each valve preferably includes a plurality of dampers and an adjustable actuator that positions the dampers. The actuator for the first valve is power operated in response to the temperature of processing gas within the associated oven fed by the heater while the actuator of the second valve is manually adjustable. An inner housing portion and an insulated outer housing portion of the heater housing have hollow elon- gated shapes with round cross sections and are arranged in a coaxial relationship such that the inner housing portion defines the first gas flow path and the space between the inner and outer housing portions defines the second gas flow path. An upstream end of the inner housing portion receives the burner while a downstream end thereof mounts a conical mixing member for causing mixing of the gas from the two paths within a mixing chamber defined by the outer housing portion adjacent the downstream end of the inner housing portion. A wall extends between the inner and outer housing portion at a P-305a location between the control valves to separate the gas flow paths adjacent the inlet. An adjustable fresh air inlet in the outer housing portion, annular baffles along the first and second gas flow paths, and a blower within the outer hous- ing portion downstream from the mixing chamber cooperate with the other components of the heater during its operation to pro vide efficient heating of processing gas for delivery to the oven.
367665
Gladd Industries Inc.
Smart & Biggar
LandOfFree
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