초록 ▼

A dual fuel system for use with internal combustion engines comprising (a) a manually actuated dual fuel valve, (b) a liquified gas to gaseous fuel converter combining a liquified fuel lock-off valve responsive to engine vacuum and a fuel metering valve responsive to a predetermined positive pressur

A dual fuel system for use with internal combustion engines comprising (a) a manually actuated dual fuel valve, (b) a liquified gas to gaseous fuel converter combining a liquified fuel lock-off valve responsive to engine vacuum and a fuel metering valve responsive to a predetermined positive pressure modulated by engine vacuum, and (c) a positive pressure gaseous fuel and air mixer having a compact plunger structure in which the fuel valve is located within the air valve structure. In one embodiment, the mixer employs a relatively large piston which travels a relatively short distance to meter the flow of air between the lower surface of the piston and a coaxial annular surface. A second embodiment of the mixer utilizes a smaller diameter piston which travels a relatively longer distance, but which utilizes a relatively flat plunger to meter air flow. The fuel valve carried by the plunger structure may be of the needle valve or slotted tube type and may serve as a guide for the air valve structure. Separate air and fuel controls are provided for engine idle, and a portion of the fuel valve structure is replaceable to accommodate gaseous fuels with different physical properties.

대표청구항 ▼

Apparatus for mixing air with a gaseous fuel for application to a combustion chamber comprising: a mixing chamber having an air passageway adapted for fluid communication with a source of air, a fuel inlet aperture adapted for fluid communication with a source of a gaseous fuel, and an outlet apertu

Apparatus for mixing air with a gaseous fuel for application to a combustion chamber comprising: a mixing chamber having an air passageway adapted for fluid communication with a source of air, a fuel inlet aperture adapted for fluid communication with a source of a gaseous fuel, and an outlet aperture adapted for fluid communication with a combustion chamber; air valve means for restricting the passage of air from said air passageway to said chamber outlet aperture responsively to engine venturi vacuum, said air valve means including a piston slidable in a cylinder and having an axial passage in fluid communication with said fuel inlet aperture; and fuel valve means located within said axial passage for restricting the passage of gaseous fuel from said fuel inlet aperture to said chamber outlet aperture responsively to movement of said air valve means.