The Nash Engineering Company

Douglas Frederick Sweet

Harold K Haavik

A conically ported liquid ring pump has one or more port structures with cone angles in the range from 15 degrees to 75 degrees. These cone angles are substantially greater than previously used cone angles (most commonly about 8 degrees). The large cone angles of this invention give the fluid flowing between the cone and the rotor significant components of both radial and axial velocity. Large cone angles also allow the port structure(s) to be made axially shorter, which has a number of important advantages such as shortening the unsupported length of the rotor shaft. These attributes of the present pumps are helpful for such purposes as allowing the length-to-diameter ratios of the pumps to be economically increased. In addition, the pumps of this invention retain many of the desirable attributes of conically ported pumps.

Mixed flow liquid ring pumps

A suction box for use in drying a felt web in a papermaking machine has one or more cover members in contact with a surface of the felt web. The surface of at least one of these cover elements which normally contacts the felt web has a leading portion which is feathered or inclined away from the surface of the felt web in the direction opposite the direction of motion of the felt web. This allows the felt web to come into contact with the cover member surface more gradually, which reduces wear on the felt.

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Birmingham, AL, United States of America

Douglas Frederick Sweet