Patent ID: 6368371
Filing Date: 2002-04-09
Classification: B01D,F04B

Abstract:
A trap apparatus disposed in a discharge passage for discharging therethrough a gas from a vacuum chamber with a vacuum pump, said trap apparatus comprising;a trap unit for trapping and removing a product in a discharged gas, wherein said trap unit contains trap passages comprising an upstream passage portion spreading outwardly from a center-line of the trap unit and a downstream passage portion directed inwardly toward the center-line of the trap unit, wherein said trap passages are provided on opposite sides with respect to said center-line, and wherein said passages are defined by baffle plates having portions with a shape selected from at least one of an arcuate shape and a flat shape, each of said portions extending across the flow of discharged gas such that the flat shaped portions of the baffle plates have their flat surfaces parallel with the flow of discharged gas.