Patent ID: 7534978
Filing Date: 2009-05-19
Classification: B23K

Abstract:
1. Process chamber of an installation for the thermal treatment of printed circuit boards ( 1 ), with a fan wheel ( 30 ) supported on a shaft ( 10 ) parallel to the printed circuit boards ( 1 ), said fan wheel ( 30 ) being disposed between two walls ( 6 , 7 ) of the process chamber, characterized in that the fan wheel ( 30 ) is open at its two opposing end faces ( 13 , 14 ) and the two opposing end faces ( 13 , 14 ) are configured as a pair of intakes such that gas flows in unimpeded in two substreams ( 16 , 17 ) into the two opposing end faces ( 13 , 14 ) of the fan wheel ( 30 ) and flows out from the cylindrical surface of the fan wheel ( 30 ) over the length thereof and in the extent of the process chamber in the form of a ribbon-shaped gas stream ( 28 ), said gas stream ( 28 ) being directed essentially in said cross section through a channel ( 29 , 24 ) onto the printed circuit boards ( 1 ).