Air assist fuel injectors

An air assist fuel injector comprising:

• an armature of ferromagentic material having a first end, a second end located opposite from said first end, and a conduit extending between said first end and said second end;
• a solenoid for moving said armature when said solenoid is energized;
• a poppet attached to said armature such that said poppet is actuated when said solenoid is energized, said poppet having a passageway for conveying a mixture of liquid fuel and gas, said passageway having an inlet for receiving said mixture of liquid fuel and gas, said conduit receiving an end portion of said poppet, said inlet of said passageway being located within said conduit;
• and
• a flow path located between an area upstream of said inlet with respect to a direction of flow of said mixture and an area downstream of said armature with respect to said direction of flow, said flow path including at least one of a recess in a surface of said conduit and a recess in an exterior surface of said poppet.

An air assist fuel injector comprising:

• a cap having a plurality of channels for delivering a mixture of liquid fuel and gas, each of said plurality of channels having an inlet and an outlet and being spaced from each other;
• an armature of ferromagentic material having a first end, a second end located opposite from said first end, and a conduit extending between said first end and said second end, said conduit having an inlet, all of said outlets of said plurality of channels being located radially inward of a periphery of said inlet of said conduit;
• a solenoid for moving said armature when said solenoid is energized;
• and
• a poppet attached to said armature such that said poppet is actuated when said solenoid is energized, said poppet having a passageway for conveying a mixture of liquid fuel and gas, said passageway having an inlet for receiving said mixture of liquid fuel and gas, said inlet of said passageway being located downstream of said first end with respect to a direction of flow of said mixture.

An air assist fuel injector comprising:

• an armature of ferromagnetic material having a first end, a second end located opposite from said first end, and a conduit extending between said first end and said second end;
• a solenoid for moving said armature when said solenoid is energized;
• an armature guide having a passageway that receives said armature;
• a poppet attached to said an-nature such that said poppet is actuated when said solenoid is energized, said poppet having a passageway for conveying a mixture of liquid fuel and gas, said passageway having an inlet for receiving said mixture of liquid fuel and gas, said inlet of said passageway being located downstream of said first end of said armature;
• and
• a flow path between an area upstream of said first end with respect to a direction of flow of said mixture and an area downstream of said second end with respect to said direction of flow, said flow path including at least one of a recess in an exterior surface of said armature and a recess in a surface of said passageway.