GB939926A - Improvements in or relating to dryer drums - Google Patents

Abstract

939,926. Hollow rollers. BELOIT IRON WORKS. Feb. 1, 1961 [Feb. 8, 1960], No. 3828/61. Class 34 (1). A drier drum comprises an outer cylindrical shell into which steam is fed having a head at each end thereof, and rotatably mounted on journals, and a plurality of longitudinally spaced, circumferentially continuous ribs formed integrally with the shell defining radially inwardly opening spaced grooves therebetween open to the chamber within the shell. A hollow drum drier comprises a cylindrical shell 12, Fig. 1, integrally formed with longitudinally-spaced, circumferentially-continuous ribs (not shown) defining grooves therebetween and being heated by steam which is introduced through nozzles 36. 37 in a conduit 30 and removed together with condensate through a conduit 32, the conduits extending into the shell from end heads 14, 16 having journals 18, 20 connected thereto by plates 22, 24. Dipper pipes 41, 42 extending longitudinally of the drum and maintained in position by radially extendable rods 43, 44 have siphon pipes 62, 64 extending into the conduit 32 so that condensate which is sucked from the spaced grooves in the drum shell by tubes (not shown) spaced axially along the dipper pipes extending into the grooves is exhausted through the dipper pipes and the siphon pipes into the conduit 32 for outlet through a tube 130 in the journal 20. The ribs and troughs may be formed of equal and uniform width with the sides of the ribs extending radially and perpendicularly to the drum axis with the inner end surfaces straight in cross-section, or in a modification the ribs 119, Fig. 5, may have a width up to eight times greater than the width of the grooves to provide uniform heating of the external surface of the shell and a high strength to resist circumferential stress. The upper surfaces 122, 124 of the ribs may form an apex while the sides 126, 128 define a uniform width for the troughs therebetween. Counterbores 136 are formed at diametrically opposite portions of the grooves to provide shoulders 138 against which the tubes (not shown) may seat in the desired relation to the groove bottoms. The ribs may be of gradual helical configuration, the angle of the helix being 10 degrees or less, instead of circular in construction.