×

Turn-off control circuit for self-cleaning ovens

  • US 4,481,404 A
  • Filed: 12/22/1982
  • Issued: 11/06/1984
  • Est. Priority Date: 12/22/1982
  • Status: Expired due to Fees
First Claim
Patent Images

1. A self-cleaning thermal oven and control therefor, comprising:

  • a thermal cooking oven cavity;

    electrically-energizable means within said oven cavity for thermally heating the interior of said cavity to a temperature at least high enough to pyrolyze cooking soil within said cavity and convert said soil to an effluent capable of flowing out of said oven cavity;

    a smoke eliminator comprising a passage, extending from the interior of said oven cavity to external atmosphere;

    an electrically-energizable smoke eliminator heater disposed to heat effluent which flows from said thermal oven cavity and through said passage, said smoke eliminator heater being operable to oxidize partially pyrolyzed components in the effluent produced by said oven heater means;

    a reducing gas sensor fixed relative to said smoke eliminator passage at a position before the end of said passage furthest from said oven cavity and exposed to at least a portion of said effluent which flows from said oven cavity and through said passage, said reducing gas sensor producing an electrical output related to the concentration of pyrolyzed products in said effluent; and

    electrical control means coupled to said oven thermal heating means for connecting and disconnecting power thereto, said reducing gas sensor being electrically coupled to said electrical control means to cause said electrical control means to disconnect power from said oven thermal heating means responsive to an output of said reducing gas sensor which is indicative of the completion of the oven cleaning process and of a pyrolyzed product concentration in said effluent which is less than a given amount.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×