Low-pressure spray nozzle assembly

A low-pressure spraying equipment for atomizing a working fluid at a low-pressure, the low-pressure spraying equipment comprising:

• a spray tip body having a top and a lower end;
• a handle arranged on the top of the spray tip body;
• and
• a chamfer defined at the lower end of the spray tip body,
• wherein:
• the low-pressure is at 1000 psi or lower,
• the low-pressure spraying equipment is configured to uniformly apply the working fluid with the low-pressure to a surface of a workpiece during a spraying operation,
• the handle further comprises a spray direction indicator on a side of the handle,
• the spray direction indicator is designed to point to a discharge direction of the spray tip body,
• the spray tip body further comprises a retaining shoulder and a ring collar, a mounting hole having a channel axis, a pre-atomizing component, and a tip atomizing component,
• the pre-atomizing component further comprises a feeding channel, a pre-atomization channel, and a pre-atomization regulating channel,
• the feeding channel, the pre-atomization channel, and the pre-atomization regulating channel are three coaxial hollow channels sequentially defined and connected along the channel axis inside the pre-atomizing component,
• the feeding channel, the pre-atomization channel, and the pre-atomization regulating channel form a dumbbell-shaped hallow structure,
• the pre-atomization regulating channel having a uniform diameter that is at least five times as large as a uniform diameter of the pre-atomization channel to compress the working fluid when the working fluid is flowing through the pre-atomization channel,
• the feeding channel is a single cylindrical through hole with an inner surface having a feed turbulence thread to force the working fluid to rotate along the internal surface of the feeding channel and towards the pre-atomization channel to compress the working fluid and reduce a flowing speed of the working fluid and then sequentially flow through the pre-atomization regulating channel with an inner surface having a regulating turbulence thread to further mix the working fluid to form a turbulent fluid in disordered motions and release the low-pressure of the working fluid,
• the pre-atomization regulating channel is a single cylindrical through hole with the inner surface having the regulating turbulence thread to form a vortex and push the working fluid to flow to the internal surface of the regulating turbulence thread to thereby reduce a net pressure loss of the working fluid and refine particles of the working fluid to promote a uniform spray pattern, and
• the pre-atomizing component and the tip atomizing component are connected to each other sequentially along the channel axis, in a fluid stream direction.