Importance

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Abstract

An overspray filter collector unit for a plasma spray system filters fine, relatively small particulate from the overspray upstream of the vacuum pumps. The filter collector unit includes a hollow tank having a pool of oil at the bottom thereof having a top surface onto which the overspray is directed from an inlet conduit. Some of the particulate matter is deposited in the oil and at the same time oil droplets and vapor are entrained in the overspray as it deflects from the oil surface into a tortuous path defined by a plurality of baffles within the tank. The baffle surfaces are wetted by the oil vapor and droplets, and the resulting oil coating entraps the remaining particulate in the overspray before the overspray exits via an outlet conduit to the vacuum pumps. The oil on the surfaces of the baffles with the entrapped particulate therein continuously drains via gravity to the pool of oil at the bottom of the tank and is replaced by oil at the surface of the pool entrained into the continuous flow of overspray. When the accumulation of particulate in the oil is such that the oil rises to a predetermined level, the oil is drained and replaced with fresh oil.

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First Claim