| 摘要 |
<p>A powder spray gun comprises a tubular housing (12) having ambient air flow passages (40) located in the sidewall thereof medially of the opposite ends. A pair of air flow amplifiers (14,16) are mounted in the housing (12) on opposite sides of the ambient air flow passages and are so oriented that compressed air supplied to the upstream one of these amplifiers, the so-called suspension amplifier (14), is operable to draw ambient air into the outlet end of the suspension amplifier, and compressed air supplied to the downstream amplifier, the so-called pattern amplifier (16), is operable to draw ambient air into the inlet end of the pattern amplifier. The spray gun (10) includes means (190) for preventing the egress of powder through the ambient air flow passages of the housing caused by back pressure generated by a restricted discharge orifice of a powder discharge nozzle of the gun.</p> |
