Patent ID: 8784538

Claim:
A unit ( 3 ) for deaeration of drainage water from a paper machine, said unit ( 3 ) comprising: an inlet ( 8 ) for receiving the drainage water in a first flow direction; an outlet ( 39 ) for removing the drainage water to a subsequent deaeration channel; and a first chamber ( 5 ) that is arranged downstream of the inlet ( 8 ), said first chamber ( 5 ) comprising a first chamber part ( 18 ), and a second chamber part ( 19 ) that is arranged downstream of the first chamber part ( 18 ), wherein the first chamber part ( 18 ) comprises: a guide wall portion ( 37 ) for redirecting the drainage water in a predetermined second flow direction that differs from the first flow direction, said guide wall portion ( 37 ) being formed by a plurality of curved guide walls ( 10 , 23 ) which define a plurality of curved and substantially parallel flow channels ( 15 ) for the drainage water and that the guide walls ( 10 , 23 ) are arranged to interact with the drainage water in such a way that air is forced out of the drainage water; and two substantially planar end walls ( 25 , 26 ), which are substantially parallel to the first flow direction and which are arranged on respective sides of and substantially orthogonally to the guide walls ( 10 , 23 ), wherein each end wall ( 25 , 26 ) of at least one of the flow channels ( 15 ) exhibits an opening ( 27 ) that communicates with the flow channel ( 15 ) for removing at least part of the air, which has been released from the drainage water in the flow channel ( 15 ) by said interaction, from the first chamber part ( 18 ).