US1629598A - Condensation exhaust for drying cylinders and such like - Google Patents

Description

May 24. 1927. 629,598

P. O. T.' SYLWAN CONDENSATION EXHAUST FOR DRYING CYLINDERS AND SUCH LIKE Filed Dec. 11. 1926 dwwtw (PM, Out; JLWMJ LW Patented May 24, 1927.

PATENT OFFICE.

PER or'ro rHnonoR sYLwAN, or FORSHAGA', SWEDEN.

CONDENSATION EXHAUST FOR DRYING CYLINDERS AND SUCI-I- LIKE.

Application filed December 11, 1926, Serial No. 154,244, and in Sweden June 25, 1925.

The methods hitherto in use for exhausting or emptying drying-cylinders and such like are partlyof the type called siphon exhausts and partly of the type called scoopexhausts.

The siphon exhaust is characterized by a rigid pipe opening against the bottom of the cylinder, and is on the outside of the cylinder in connection with a discharge for the condensed fluid.

As the siphon acts not only through the difference in the height of the fluid but also on account of the surplus pressure in the cylinder, the consequence is that, after it has commenced operation, it continues to function until. the cylinder has been emptied and the siphon dropped, 1, e. gets out of con nection with the fluid in the cylinder. If then there is any air in the cylinder, and the pressure in the same is slight, a considerable time can lapse before the underpressure in the members located outside the cylinder has decreased so much that the siphon is again filled and commences to function. The result of this is that the device will either work more or less periodically with a varying effective drying surface, or otherwise the condensation exhaust must allow a certain uncontrollable amount of steam to pass through, which amount, according to what experience has proved, can be considerable.

The scoop exhaust which is characterized by a scoop rotating with the cylinder, and which scoop for every revolution delivers to an outlet pipe any condensation collected, is more reliable than the siphon exhaust in so far that it operates with shorter, more precisely determined periods, provided the cylinders diameter is not too small, the drop ping distance from the cylinder 'too slight and the steam pressure too low. If this, however, is the case, experience shows that air pockets may occur in the outlet or discharge pipe, which for a considerable period, and until the steam pressure in the cylinder has been raised or a free passage for air and steam through exhaust members ha been brought about, prevent the removal or discharge of the condensation.

The present invention refers to a device which enables the emptying of the cylinders with a continuously acting siphon, which is always filled with a fluid and need not allow struction of the same in vertical section.

1 designates the rotatable drying cylinder which is runnin in bearings on the pivots 2, 3 in a known manner.

The pipe which is intended for carrying off any condensationforn'ied in the drying cylinder passes through a box in the pivot 23,

and farther to the water-seal or -lock l. From this water-seal there is arranged an outlet pipe 9, the upper opening of which is situated somewhat higher-than the ends of the pipe or tube .5.

,The tube 9 opens the water-seal 4: and which can possibly form a collecting vessel for condensations from several drying cylinders. Through an overflow outlet pipe 13 the condensation from the water-seal 10 is carried to an ordinary condenser vessel 11 or such like. A tube or pipeline 6, which in a manner seen from the drawing issues from the interior of the drying cylinder, the mouth of which inside the same is situated at a slightly higher level than theupper mouth of the tube 9, passes through a box in the pivot 3 and communicates outside the cylinder with branch pipes 7, 8 by means of which the steam chamber of the cylinder is put into direct communication with the upper parts of the water-seal 4 and 10 in a manner seen from the drawing, so that, when the fluid in the drying cylinder 1 does not reach up to the tube 6 and shuts it off, the same pressure exist in all the vessels 1, l and 10.

The tube 6 is further provided with a valve or tap 12, intended to be made use of not only in starting the device but also for exhausting air and controlling the water level in the cylinder.

Of course, the tube 6 can outside the cylinder be provided with further side lines or branches for pressure gauge, automatic devices for pressure regulation, air exhaust,

etc. The tubes 7 and 8 can possibly instead of connection with the common tube 6 com downwardly into a water-seal 10, which is situated lower than ill municate with the interior of the drying cylinder by means of a tube each, which tubes can then open out upon different levels inside the cylinder so that a more manifold control of the water level can be obtained by this means.

By the device here described the siphon 5 is prevented from being emptied, the speed of the fluid through the same is regulated by a difference in level between the surfaces of the fluid in the cylinder 1 and the Waterseal l respectively. If the necessary difference in level becomes so great that the surface of the fluid in the cylinder 1 rises to the mouth of the tube (3, the connection between the steam chamber and Water-seal of the cylinder is shut off. Through cooling and condensing Within the members located outside the cylinder there occurs then an underpressure in the same, and the running off or discharge of the condensation through the tube 5 is immediately hastened until the surface of the fluid again drops or sinks down below the mouth of the tube 6.

Thus the variation of the height of the fluid in the cylinder 1, and with it its effective drying surface, can be narrowly limited by a suitable adjustment of the tubes 6 and 9.

The Water-seal 10 can, as has been mentioned, be made jointly for several cylinders, in which case the connection through the tube 8 is arranged to only one of these cylinders. The length of the tube 9 then becomes the decisive factor as to What degree the pressures in these cylinders shall be allowed to difler mutually.

Having thus described my invention, I declare, that What I claim is v 1. A condensation separator for drying cylinders and the like, comprising a pipe running from the interior of the drying cylinder to a Water seal arranged outside the cylinder, said pipebeing adapted to serve as a siphon, and a tube issuing from steam chamber in the drying cylinderv and serving as a steam and air outlet, said tube being in communication with the upper. part of said water seal so that the same pressure will be prevalent on the fluid-surfaces in said drying. cylinder and in said Water seal.

2. 'A condensation separator for drying cylinders and the like comprising a pipe running from the interior of the drying cylinder to a water seal arranged outside the cylinder, said pipe being adapted to serve as a siphon, a second pipe issuing from said water seal for conducting ofl' the fluid from said water seal, the upper mouth of said second pipe being situated at a higher level than the mouth of the pipe issuing from the cylinder, said second pipe opening into. a second fluid seal, said second fluid seal being provided with an overflow outlet, and a tube issuin from steam chamber in the drying cylinder and serving as a steam and air outlet, said tube being in communication with the upper part of both water seals so that the same pressure will be prevalent on the fluid-surfaces in said drying cylinder and in said Water seals. In testimony whereof I aflix my signature.

PER OTTO THEODOR SYLl/VAN

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