Spill type swirl injector

A spill type swirl injector comprising:

• a nozzle body having an inner cylindrical wall;
• a pressurized fluid supply source;
• an injection port opening at one end of said nozzle body for injecting pressurized fluid;
• pressurized fluid supply passage means;
• a pressurized fluid induction passage provided within said nozzle body, said pressurized fluid induction passage being connected to said pressurized fluid supply source through said pressurized fluid supply passage means;
• valve means including a movable member interposed into said injection port for controlling the fluid injection by on-off controlling the fuel supply to said injection port;
• a swirl chamber comprising an annular chamber formed between said inner cylindrical wall of said end of said nozzle body and an outer cylindrical wall of said movable member of said valve means, at a position adjacent to said injection port within said nozzle body, said swirl chamber being connected to said injection port;
• first and second tangential pressurized fluid supply passages formed within said nozzle body in communication with said pressurized fluid induction passage and opening into said inner cylinder wall of said nozzle body of said swirl chamber in the tangential direction thereof for forming swirling flow of said pressurized fluid within said swirl chamber;
• and
• spill means comprising said movable member having first and second spill openings formed therein communicating with said outer cylindrical wall of said movable member of the valve means and opened into said outer cylindrical wall of said movable member in said swirl chamber;
• said first and second spill openings being diametrically opposite each other, and
• said first and second spill openings being positioned at a distance farther from said fuel injection port than said tangential pressurized fluid supply passages when said injecton port is closed by said valve means;
• and
• first spill passage means comprising said movable member having an axial hole formed therein communicating with said two spill openings, and said nozzle body having second spill passage means formed therein communicating with said axial hole and said pressurized fluid supply source, thereby spilling a predetermined quantity of the pressurized fluid from said outer cylindrical wall of said movable member in said swirl chamber through said first and second spill openings, said axial hole and said second spill passage means, wihout decreasing the swirling energy of the swirling flow in said swirl chamber, such that the fluid is injected in the form of a liquid film flow having a sufficiently high swirling velocity immediately after the valve is opened so that the sprayed liquid droplets are fine and uniform and the atomozing characteristics and response of atomization to the injection pressure are improved.