US1709581A - Means for removing condensate from steam-heated rollers - Google Patents

Description

April 16, 1929. G. s. JOHNSON KEANS PQR REIOVING CONDENSATE FROMSTEAM .HEATED ROLLERS Filed July 21. 1926 WANN..

.:IIII .mw NN .NN QN NN w/ lli w Patented Apr. 16, 1929.

UNlTED'sTATEs 1,709,581, PATENT OFFICE.

GEORGE SHEPARD JOHNSON, OF'MAIJISON,.WSCONSI`[ N, ASSIGNOR TO C. pF. BURGESS LABORATORIES, INC.,` OF MADISON, WISCONSIN, A CORPORATION ,OFMDe-LLA'WARE.

MEANS FOR REMOVING CONDENSATE STEAM-HEATED ROLLER/S.

Application filed .Tuly- 21,

This invention relates to improvements in means for removing condensate from steam vheated rollers. Such rollersor rolls are used in various arts, for example, in the paper 1ndustry in which the web is dried as it travels in Contact with a series of rolls of fairly large diameter. The rolls Vare steam tight, the steam being admitted through the hollow journals.y In starting the operation, whenthe rolls are cold, the steam condenses rapidly, resulting in the immediate accumulation of a considerable amount of water in the roll, which condensate may be augmented during the continued operation of the rolls, depending onk the pressure and temperature maintained within the same. Itis necessary to withdraw this condensate through the hollow journal, an operation which in some cases could not be performed when the rolls were stationary and in other cases, was unsatisfactory for other reasons, including slow and uneven heating. y l j The general object of this invention is to provide improved means for removing said condensate through the journal in such a way thatthe roll heats'up quickly and maintains a more even temperature.

Other objects are to provide a device of this character which will drain the roll of water whether said roll is stationary or rotating; which will prevent steam from blowing out after most of the water has been drained therefrom; and which if suctionV is used to withdraw said'water will not operate so as to cause the suction to break.

An additional object -is to provide means j whereby said device may be readily reached for inspection, renewal and repair. j

In the drawings, in which one embodiment of the invention has been illustrated,

Figure 1 is a sectional elevation of a roll. and its appurtenances.

F ig. 2 is an end elevation thereof onI a smaller scale. n

Fig. 3 is an enlargedsectional elevation of a trap, including a needle-valve operated by a float. f

Fig. 4 is ahorizontal section through the hollow journal of said roll.

The roll illustrated in the drawings is one such as is used in the paper industry, although the invention is not limited to this art. Said roll comprises a cylindrical metal shell 10 having end plates or heads 11 secured thereto, the structure thus formed being rotatably arm is pivotedatQG to a bracket 27 192e. serial No. V122,911.

supportedby journals, l 12, 13, which turnin i I suitable bearings, not shown. Steam for heating the roll is supplied through a stationary structure'. which is held against an eXtension 14 on the end of the hollow yjournal 13 in the usual manneigforming no part of the present 'Water of condensation is removed through a passageway 16, formed in the same member 17 which contains the steam passageway l5,

said member forming aclosure for thel adjacent seaininlet chamber. A pipe-18 is arranged preferably coincident with the axis,

of rotation of said cylinder,.extending from the inner wall of the passageway 16 intofthe cylinder and then curving downwardly and terminating nearthe lowest part of the cylinder and preferably near the opposite end of said cylinder. Said pipe may be supported further by a skeleton frame or spider 19 mounted thereon and restingon the cylindrical innerwall ofthe hollow journal 413. The end of said shaft may be provided with a coupling 20 which receives a screw threaded plug 2l constituting an adjustable valve seat and having an opening 22 which receives a needle valve 23, the latter being pivoted at one end to a projection 24 on an arm 25. Said l carried by the coupling 20. The free end of said arm 25 carries a float- 28vconsisting of a hollow structure of any suitable configuration.

The arrangement is such that the weight of the parts maintains the needle valve closed when said parts are in normal position, as Shown in Fig. 3. W'hen said float 28 is raised by being submerged in the Vwater condensing in the cylindrical roll 10, said needle valve is withdrawn from its seat, somewhat as shown in dotted line position in said ligure. The parts are so proportioned that the lloat is not raised until after the water level is above saidneedle valve, thus preventing waste of steam lwhich would otherwise blow out through said pipe 18. When the valve is submerged and opened, the pressure of the steam on the surface of the .water will force the latter through said valve and through the outlet pipe 16, reducingv the level lto approximately that of the needle valve, orr preferably elightly above it, by which time the float has descended suti'iciently to close said valve. Under these circumstances, it will be seen that Waterremaining in said roller is comparatively shallow in depth, and therefore islnot very effective as a non-conductor of heat between the hot interior of the roll and the web in Contact With the outer surface.

The device operates effectively Whether the rolls are stationary or rotating. Then the rolls are rotating, as suggested by the arrow in Fig. 2, the surface of the Water is not horizontal, but assumes somewhat of an incline (see dotted line), depending on the speed o'tl rotation, since the Water adheres to the inner surface of the roller. Therefore, the trap, consisting of the needleV valve and associated parts heretot'ore described, may be oset a little with reference to the vertical plane passing through the axis of rotation of said roll, if desired, although normally it would be located at the lowest point Within said cylindrical chamber and preferably remote from the steam inlet in a region Wherethe initial condensation is most rapid;

` By maintaining the level of the condensate at as low a .point as possible at the outset, the

roll heats up quickly and the heat is evenly distributed When the rolls is in operation.

It suction is applied to the Outlet pipe, said suction is never broken as the valve is open only When it is submerged.

The steam trapV may be readily installed or removed for inspection Or `adjustment through the hand-hole 29 after removing the cover-plate 30.

I claim as lny invention:

A device of the class described, adapted to be mountedfin close proximity to the bot-tom upwardly for moving the needlevalve to open position.

In testimony whereof', I have subscribedV Illy D 21H18.

GEORGE SHEPARD JOHNSON.

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