Patent ID: 8122720

Claim:
A fuel nozzle apparatus comprising: a fuel pump that is configured to feed fuel; a fuel flow passage having a circulation flow passage through which the fuel is capable of flowing; a flow controller configured to control a flow rate of the fuel flowing from said fuel pump into said circulation flow passage; a circulation pump configured to circulate the fuel within said circulation flow passage; a nozzle section having an injection nozzle configured to inject the fuel from said circulation flow passage to the outside; and an injection controller configured to control an injection amount of the fuel to be injected from said injection nozzle; wherein said injection controller comprises a valve element arranged in between said circulation flow passage and said injection nozzle, said valve element is configured to move to said circulation flow passage side or said injection nozzle side on the basis of a pressure difference between a pressure within said circulation flow passage and a pressure outside said injection nozzle, thereby changing a flow passage area for said fuel flowing into said injection nozzle, said circulation flow passage adjacent to said valve element comprises a throat section in which a flow passage area becomes narrower, a pressure within said throat section is controlled based on a flow rate of said fuel flowing into said circulation flow passage and a flow rate of said fuel circulating in said circulation flow passage, said circulation flow passage comprises two cylindrical flow passages, said two cylindrical flow passages are an inside flow passage and an outside flow passage, and are connected to said throat section, and radiuses of said inside flow passage and said outside flow passage are different from each other, and said valve element is arranged between said throat section and said injection nozzle, and has a toroidal shape with a cross-section of a substantially circular shape.