Heating – Having condition responsive control – Of or by pressure of fluid work or work chamber atmosphere
Patent
1984-09-06
1986-02-11
Camby, John J.
Heating
Having condition responsive control
Of or by pressure of fluid work or work chamber atmosphere
34 46, 34216, 34217, 99443C, 99473, 99474, 432144, F27D 1900, F26B 2106, A23L 300, F27B 900
Patent
active
045696586
ABSTRACT:
A tunnel oven 20 has a baking chamber divided by partitions 21 into a plurality of longitudinally extending zones 22. The oven heating system comprises upper and lower heater ducts 6a, 6b through which hot gases are passed, using a blower 24 for each zone 22. The intake of each blower 24 is within the associated zone 22 and is disposed adjacent the outlet end of an inlet duct 11 which leads into the lower part of the zone. An outlet 8 leads out of the upper part of each zone 22. The entry end 27 of the inlet duct 11 is open to atmosphere whereby fresh air is introduced into the duct. The exit end of the outlet duct 8 is connected to an exhaust fan 7 whereby gases are extracted from the zone 22 by way of the outlet duct 8 to an exhaust flue 18. Dampers 12 and 10 comprise first and second regulating means for controlling flow through the inlet and outlet ducts 11 and 8. A pair of pressure probes 16, a pressure transducer and controller 17, and a damper-actuator 9 form an arrangement sensitive to unwanted changes of oven pressure within the zone 22 and operable to adjust the damper 10 so as to substantially restore the zonal status quo.
REFERENCES:
patent: 1539230 (1925-05-01), Anderson
patent: 2838420 (1958-06-01), Valente
patent: 3146821 (1964-09-01), Wuetig
patent: 3849904 (1974-11-01), Villalobos
Wiggins Christopher N.
Wood Roger H.
Baker Perkins Holdings, Plc.
Camby John J.
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