INJECTION SYSTEM WITH VARIABLE GEOMETRY ADOPTING AIR FLOW ACCORDING TO ENGINE RPM

摘要

The burner consists of a fuel injector (4) in the base of the combustion chamber (6), fed by an inlet tube (3), and an inner spiral (7) which provides primary air for the fuel combustion. The air feed is controlled by a regulator which operates as a function of the engine mode and is made in the form of a shutter (14), able to move axially between a position in which it covers the inner spiral in the engine's low speed mode and opens it to the maximum in the high speed mode. The shutter is mounted on elastic metal bellows (20, 21, 23) which connect the inlet tube (3) and injector (4) and ensure the continuity of the fuel circuit. At the same time the bellows control the movement of the shutter by their elastic deformation under the pressure of the fuel delivered by the inlet tube. The shutter is connected to the inlet tube by two coaxial bellows forming a chamber (22), and to the injector by one bellows element (23). The axial movement of the shutter is limited by stops (25, 26).