초록 ▼

A single phase and three phase heater element circuit for a ceramic fiber heater wherein a plurality of blocks each of which is formed by a plurality of heater elements arranged side by side on a base of insulation material and connected to one another to form a series circuit, said series circuit b

A single phase and three phase heater element circuit for a ceramic fiber heater wherein a plurality of blocks each of which is formed by a plurality of heater elements arranged side by side on a base of insulation material and connected to one another to form a series circuit, said series circuit being connected across an electric power source, and adjacent ends of the series circuits in adjacent blocks being connected to the same terminal of said electric power source. By connecting adjacent ends of adjacent blocks of ceramic fiber heater element circuits together, the ends of the series circuit connected to separate terminals of the power source are spaced sufficiently far apart from each other such that current flow through the insulation material between ends adjacent the blocks is minimized and preferably substantially prevented for preventing short circuiting and failure of the heater.

대표청구항 ▼

A ceramic fiber heater comprising: (a) a base constructed of a ceramic fiber insulation; (b) first and second heater blocks arranged side by side with each other on said base, said first heater block comprising a first series circuit comprising a plurality of heater elements arranged side by side on

A ceramic fiber heater comprising: (a) a base constructed of a ceramic fiber insulation; (b) first and second heater blocks arranged side by side with each other on said base, said first heater block comprising a first series circuit comprising a plurality of heater elements arranged side by side on said base and connected together in series such that said heater elements are carried substantially along said length of said first series circuit by said base, said first series circuit having first and second ends spaced apart from one another and located on a common side of said base, said second series circuit including a second series circuit comprising a plurality of heater elements arranged side by side on said base and connected together in series such that said heater elements are carried substantially along said length of said second series circuit by said base, said second series circuit having first and second ends spaced apart from one another and located on said common side of said base, said second end of said first series circuit being located between said first end of said first series circuits and said first end of said second series circuit, said first end of said second series circuit being located between said second end of said first series circuit and said second end of said second series circuit, said second end of said first series circuit being located adjacent said first end of said second series circuit; and (b) a source of electrical power having at least first and second terminals and a voltage differential between said terminals, wherein said second end of said first series circuit and said first end of said second series circuit are both connected to said first terminal of said power source thereby to minimize current leakage between said second end of said first series circuit and said first end of said second series circuit.