| 主权项 |
1. A spray gun for mixing and atomizing a coating material flow and an air flow in the atmosphere, the spray gun comprising:
a body having a gun barrel; a coating material nozzle disposed on a tip end side of the gun barrel, the coating material nozzle being configured to eject the coating material flow from a coating material ejection opening formed at a tip end surface thereof; and an air cap disposed on the tip end side of the gun barrel and surrounding a tip end portion of the coating material nozzle, the air cap defining a ring-shaped slit between an inner peripheral surface of the air cap and an outer peripheral surface of the tip end portion of the coating material nozzle to allow the air flow to be ejected therethrough, wherein the coating material nozzle includes a guide wall spreading from an inner periphery of the coating material ejection opening toward a tip end side of the coating material nozzle, the guide wall being located on the tip end surface of the tip end portion of the coating material nozzle, the guide wall being configured to control the coating material flow ejected from the coating material ejection opening, the guide wall including a plurality of air grooves channeled on the outer peripheral surface of the tip end portion of the coating material nozzle, the air grooves gradually increasing in depth in a longitudinal direction from a rear end side of the coating material nozzle at a predetermined position to the guide wall, the air grooves inducing a part of the air flow ahead of the coating material ejection opening, the inner peripheral surface of the air cap has a parallel surface parallel to the outer peripheral surface of the tip end portion of the coating material nozzle from the tip end side of the coating material nozzle and, successively, a tapered surface spreading in a conical shape, and an upstream end of each of the air grooves is located upstream of an upstream end of the tapered surface. |
