Suction roll, especially for a paper web drier

A suction roll having a lengthwise axis, for a paper web drier of a papermaking machine, comprising:

• a perforated roll shell having an inner surface;
• said perforated roll shell enclosing an internal chamber;
• a wall member transversely arranged with respect to the lengthwise axis of the suction roll for dividing the internal chamber;
• a suction device for establishing a vacuum in said internal chamber;
• means for defining a connection for operatively connecting the internal chamber with the suction device;
• at least one blade extending transversely with respect to the inner surface of the roll shell arranged in the internal chamber;
• said at least one blade comprising a fixedly arranged blade disposed in the internal chamber and extending transversely with respect to any possibly occurring rotational flow of suction air present in the internal chamber of the suction roll, in order to at least reduce any possibly arising rotational flow;
• said suction roll being rotatable in a predetermined direction of rotation;
• a shaft member which is stationary during operation of the suction roll;
• said at least one blade comprising a plurality of fixedly arranged blades disposed in the internal chamber;
• and
• said plurality of fixedly arranged blades being fixedly mounted at the shaft member.

A suction roll having a lengthwise axis for a paper web drier of a papermaking machine, said suction roll comprising;

• a perforated roll shell having an inner surface;
• said perforated roll shell enclosing an internal chamber defined in part by the inner surface of said perforated roll shell;
• a wall member transversely arranged with respect to the lengthwise axis of the suction roll for dividing the internal chamber;
• a suction device for establishing a vacuum in said internal chamber;
• means for defining a connection for operatively connecting the internal chamber with the suction device;
• and
• means for opposing rotational flow adapted to be created within aid internal chamber by said suction device, said means for opposing rotational flow comprising at least one blade arranged in the internal chamber extending transversely with respect to the inner surface of the roll shell and extending in the direction of the lengthwise axis of the suction roll.