Rotary fuel pump

In a rotary pump for pumping liquid,

• (a) a rotor combination utilizing circumferentially disposed expanding and ensmalling, positive-displacement, pumping chambers,
• (b) a first circumferentially reduced pressure inlet area on said rotor combination,
• (c) a second circumferentially increased pressure outlet area on said rotor combination spaced circumferentially from said first area,
• (d) a first means on one side of said rotor combination comprising an inlet housing having an inlet opening at one portion and a face plate at another portion lying directly adjacent said rotor combination, said face plate having a passage and connected ports communicating with said inlet opening and with said first circumferential reduced pressure inlet area of said rotor combination, said face plate having also an outlet port facing said rotors in the second circumferential area,
• (e) outlet housing means forming an outlet chamber on the side of said rotors opposite said inlet housing to receive outlet pressure from said outlet port,
• (f) second means closing said pumping chambers on the other side of said rotor combination comprising a flexible, resilient, sealing disc having one surface lying directly against said rotors and having a flexible peripheral margin terminating outside said pumping chambers, said margin being free to move away from said rotors, and
• (g) power means to rotate said rotors and said disc simultaneously,
• (h) said disc on the surface opposite said rotors being open to said outlet chamber and the pressure in said outlet chamber whereby when pressure develops in the pumping chambers in said second circumferential area above the pressure in said outlet chamber, the periphery of said disc will flex to admit pumping fluid to said outlet chamber.