Heat gun with high performance jet pump and quick change attachments

A jet pump for a heat gun comprising:

• an elongate hollow pump body lying along a longitudinal axis having an inlet, a mixing section and an outlet, the pump body having inner walls;
• a nozzle unit axially aligned with the inlet for directing pressurized fuel into the inlet of the pump body, the nozzle unit having a series of elongate nozzle tubes, the nozzle tubes angled radially outwardly for directing the pressurized fuel towards the walls of the pump body, the movement of the pressurized fuel into the inlet causing air to be drawn into the inlet to mix with the fuel within the pump body to form an air/fuel mixture;
• an expanding diffuser in which the air/fuel mixture is pressurized;
• and
• a combustor for combusting the air/fuel mixture.

A method of pumping an air/fuel mixture in a heat gun comprising the steps of:

• providing an elongate hollow pump body, the pump body lying along a longitudinal axis and having an inlet, a mixing section and an outlet;
• directing pressurized fuel into the inlet of the pump body with a nozzle unit axially aligned with the inlet, the nozzle unit having a series of elongate nozzle tubes angled radially outwardly for directing the pressurized fuel towards the walls of the pump body, movement of the pressurized fuel into the inlet causing air to be drawn into the inlet to mix with the fuel within the pump body to form the air/fuel mixture;
• pressurizing the air/fuel mixture within an expanding diffuser;
• and
• combusting the air/fuel mixture within a combustor.