Exaktaphile
Samba Member
Joined: October 01, 2010
Photos: 241
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| Turbine Time - 3 |
Posted: Tue Jul 24, 2018 12:57 pm Views: 32
Rating: Not rated
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The cooling fan on the motor reduces the threat of hot turbine air but there's still a problem to consider. The main casting is a giant heat sink (aluminum) and the cooling fan blows the hot air onto the casting. One of the patents on this motor indicates they started using the metal casting to reduce turbine noise.
Bleeder at yellow arrow. The bleeder is a constant air leak in the system to give pressure/heat relief when you aren't pulling the trigger on the gun. The exploded drawings of a couple hvlp turbine makers show a 1/8-27 NPT hose barb with a plastic hose installed here. It's vented to the atmosphere through a cooling vent on the box. Apollo says their first turbine with bleeder was mfd. in 2007.
Early and/or Low powered turbines don't seem to have bleeders, likely because the air pressure is already pretty low. A constant bleed off the system could ruin the ability to atomize the paint. Thus the invention of the bleeder gun. hvlp turbine |
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