FUEL INJECTOR NOZZLES

摘要

Disclosed is an injector nozzle through which fluid is delivered and which has a port ( 17 ) having an internal surface and a valve member ( 13 ) having a complementary external surface. The valve member ( 13 ) is movable relative to the port ( 17 ) to respectively provide a passage between the internal and external surfaces for delivery of fluid in the form of a spray. Alternatively, sealed contact of the surfaces will prevent the delivery of fluid. The nozzle includes a flow control body ( 30 ) located beyond an extremity of the port ( 17 ). The flow control body ( 30 ) has a control surface ( 33 ) arranged downstream of the port ( 17 ) in the direction of movement of the valve member ( 13 ). The control surface ( 33 ) is configured and positioned to promote the fluid spray established by the fluid issuing from the port ( 17 ) to in part follow a path determined by the shape of the control surface ( 33 ). The flow control body ( 30 ) includes an insulating region ( 140, 141 ) arranged to restrict heat transfer from the control surface ( 33 ) to the nozzle. The insulating region ( 140, 141 ) may be the spacing between the surface ( 30 a) of the flow control body ( 30 ) closest to an end face ( 14 a) of the valve member ( 13 ) and that end face ( 14 a).