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High heating efficiency deep fat cooking frypot
| Details |
Inventors: Luebke, Clement J.; Slade, Frank A.; Sank, Gerald W.; Grob, James T.; Price, George M.; Hubbard, Elbert M.;
Assignee: The Frymaster Corporation (Shreveport, LA)
Primary Examiner: Green; Randall L.
Assistant Examiner:
Attorney, Agent or Firm: Hubbard, Thurman, Turner, Tucker & Harris
Cooking oil contained in a fuel-fired deep fat frypot is heated utilizing a recirculating flow of combustion gas produced by an induced flow fuel-air burner. A squirrel cage type centrifugal fan draws a fuel-air mixture inwardly through the burner into an inlet chamber in which the combustion gas is formed. The hot combustion gas is discharged from the fan into a supply chamber, flowed from the supply chamber into and through external heating passages extending rearwardly along the opposite exterior side surfaces of the frypot, and then enters an external heating passage extending along the rear frypot wall. From this rear passage the combustion gas is drawn forwardly through generally triangularly shaped heating tubes extending horizontally through the frypot cooking zone, into and through a return plenum, into the fan where it is mixed with a fresh supply of combustion gas from the inlet chamber, and is then discharged into the supply chamber. During burner operation excess combustion gas is discharged to atmosphere through an appropriate vent stack. A motorized inlet damper is mounted on the inlet plenum and is operable to admit ambient air thereinto to rapidly lower the recirculating gas temperature to prevent oil temperature overshoot. Rigid insulation material is positioned in lower interior portions of the heating tubes to increase the gas flow velocity therethrough and to shield the lower "cold zone" of the frypot from tube heat. In an alternate embodiment of the frypot the fuel-air burner is replaced with electric heating elements operatively disposed within the supply chamber. |
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DETAILED DESCRIPTION In carrying out principles of the present invention, in accordance with a preferred embodiment thereof, a deep fat cooking frypot is provided with a fuel-fired recirculating heating system in which rigid insulation material is extended laterally around an upper exterior portion of the frypot to form side heating passages extending horizontally along opposite outer side surfaces of the frypot, a rear heating passage extending along the back of the frypot and communicating with rear end portions of the side passages, and an insulation-defined cavity extending along the front of the frypot and communicating with the front ends of the side heating passages.
Baffle means disposed in the front cavity subdivide it into an inlet plenum extending along the front of the cavity, a return plenum extending along a laterally central rear portion of the cavity, and a discharge plenum interposed between the inlet chamber and the return plenum and opening into the front ends of the side heating passage.
Facing laterally central wall areas of the return plenum and inlet plenum are respectively provided with aligned discharge openings.
A plurality of generally triangularly cross-sectioned heating tubes extend horizontally in a front-to-rear direction across the cooking zone of the frypot and interiorly define return flow passages extending from the rear heating passage into the return plenum.
The impeller of a motor driven squirrel cage centrifugal fan is positioned in the discharge plenum with the opposite sides of its central inlet opening aligned with and closely adjacent the facing discharge openings in the return and inlet plenums.
Extending into the bottom of the front cavity is an induced draft fuel-air burner to which a fuel gas supply line having a motorized control valve therein is operatively connected, the burner having an electric igniter.
An ambient air intake opening extends into the inlet plenum and may be selectively opened and closed by means of a motorized inlet damper operatively associated therewith
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