Patent GB-190301116-A (GB)
Title: Improvements in or relating to Drying Cylinders, Rollers, and like Revolving Objects to and from which Steam or other Vapours or Liquids are Supplied and Withdrawn.
Inventor: MILNE SAMUEL
Filed: 1903-01-16
Granted: 1903-06-04
Abstract: 1116. Milne, S. Jan. 16. Drying; cylinders or drums.-Relates to modifications in the arrangements described in Specification No 25,654, A.D. 1896, for admitting steam to, and exhausting water of condensation from, the drying cylinders, rollers, &c. of paper-making, paper-finishing, a n d like machines &c. Several modifications are described in which metallic packing is used instead of fibrous material, the most important being shown in the accompanying Figures. In Fig. 2, a ring 10, having on one side a spherical bearing-surface to permit of a slight lateral disturbance, is placed between the shoulder 9 on the rotating stem 3 and the casing 6 containing the inlet 7 and outlet 8. The parts are pressed firmly together by springs 13, Fig. 4, placed under the nuts of the bolts 11, which are passed through a sleeve 14, made in halves, on the shoulder 9 and through lugs on the casing 6. Packing-rings 15 are also provided to maintain a steamtight joint between the inlet 7 and outlet 8. In Fig. 5, a packing-ring 18 is placed between the end of the stem 3 and a shoulder on the casing 6. The exhaust pipe 5 is screwed into a separate piece 16, which fits in the bore of the stem 3, and a spring 19 is provided for forcing the ring 18 against its seat. Fig. 6 shows the casing made in two parts and enclosing the shoulder 9 and packing-ring 10. A spring 20 presses both rings 10, 23 against their seats. Both the inlet and outlet passages may be formed in the stem 3, as in Fig. 7, the part to which the pipe 5 is secured being separated from the stem proper by the passages and held centrally by ribs 5<x>. A single packing-ring only is used. In Fig. 8, two metallic packing-rings 25, 26 are shown, both being flat where they bear against the casing and spherical on their abutting faces. The tube 5 may be attached to the ring 25 instead of the stem. Three packing-rings may also be employed. The scoop for draining the cylinder of condensed water consists of a box 27, Fig. 11, with a central flange 28 and two inlets 29 opening into each other. As the cylinder rotates, the water is scooped up and retained in the box until it can flow away through the pipe 5. To prevent any water from flowing back into the cylinder, the scoop is provided with a central cavity 31, Fig. 13, and two side or end cavities 32 communicating respectively with the central cavity and with the inlets 29. Any water which flows back falls into the central cavity 31 and remains there until the scoop is again elevated, when it drains away. A continuous discharge may be obtained by fitting one or the other devices shown in Figs. 15 and 18 in the pipe 5 above the scoop. In Fig. 15, the water accumulates in the chamber 35 and is prevented from re-entering the pipe 5 by a baffle 36. In Fig. 18, the partition 38 forms a pocket 39 in which the water accumulates until it can drain away. The outlet 8, Fig. 1, is fitted with a steam trap consisting of a chamber 40 containing an open flat 41 held in a central position by a pipe 42. This pipe has a series of holes 45, which, when the float is in its lowest position, are left uncovered to allow any water contained in the float to drain into the passage 46 and thence into the waste pipe 47. The condensed water enters the small chamber 43 and passes through openings 44 into the chamber 40, where it accumulates and causes the float to rise and cover the holes 45. Further ingress of water causes an overflow over the top of the float, which is thus depressed until the holes 45 are uncovered, the water within the float then flowing away through passage 46. An air-escape valve 48, which also acts as a bye-pass in case of the float sticking, is fitted in the cover 49.