Gas appliance such as a thermal weed sprayer

Abstract

A piezoelectrically-ignited gas appliance comprises a fuel regulator assembly, a burner assembly attached to the fuel regulator assembly, and a piezoelectric ignition assembly partially within the burner assembly. The burner assembly includes a transfer pipe assembly, an air/fuel mixing assembly, and a combustion assembly. The transfer pipe assembly has a proximal end attached to the air/fuel mixing assembly and a distal end attached to the combustion assembly. The an air/fuel mixing assembly has an air opening formed at the proximal end and a fuel injector formed within the proximal end and in fluid communication with the fuel regulator assembly. The combustion assembly has a combustion nozzle and combustion flange attached to the distal end. The piezoelectric ignition assembly includes an piezoelectric charge generator coupled by a thermally and electrically-insulated, semi-rigid conductive wire within the transfer pipe assembly to an electrode. The electrode has a stripped tip protruding from a terminal branch midway along the transfer pipe assembly. Prior to forming the terminal branch, the wire forms a bent part having at least two bends bracing the wire against the transfer pipe assembly. The terminal branch extends away from the transfer pipe assembly so as to properly distance the stripped tip from the transfer pipe assembly between 4 mm and 6 mm, preferably at a distance 5 mm. The appliance may comprise a thermal weed sprayer for burning weeds.

Dependencies are inferred from the claim text.