US1602644A - Paper drier - Google Patents

Description

' A. E. BRoUGHToN Oct. 12 ,K 1926.

PAPER'DRIER Filed Feb. 12. 1925 V un Patented Oct. 12, 192,6.

UNITED STATES .ARTHUR E. BBOUGHTON, F MINNEAPOLIS, IINNESOTA.

PAPER DRIEB.

Application led February 12, 1925. Serial Io. 8,881.

This invention relates to driers of the cy' lindrical type adapted for use in the manufacture of paper and other sheet orfweb material and consists in the provision. of'means for uniformly distributing a heating medium introduced into thedriers.

As is well known, it is common ractice to dry paper and other web material y passing the same over the peripheries of a series of hollow, revolving, cylinders which are heated by introducing steam through one of the bearings. With the' driers heretofore employed the quality of the product, as well as steam economy, has been detrimentally affected by inability to obtain uniform heating of the peripheries of the cylinders. This is especially true where the steam is introduced with substantial velocity, as in those drying systems in which a portion of the steam introduced to each drier is'w'ithdrawn together with the condensate and trapped air. As far as applicant is aware, no means have been heretofore provided for properly directing the inlowing steam against the inner walls of the driers.

It is my object to obviate this defect in driers by providing novel, sim le and eilil cient means for evenly distributing the heating medium against the walls of the driers.

In the accompanying drawings, which illustrate the best form of my dev-ice at present known to me, Figure 1 is a central, vertical section through a portion of a drier showing my invention as applied to a withdrawal pipe of one form; Fig. 2 is an end view of the baille and elbow shown in section in'Fig. 1; Fig. 3 is a side elevation of the parts shown in Fig. 2;` and Fig. 4 is a side elevation of my invention .as applied to a drier having another form of withdrawal pipe, the drier being shown partially in central vertical section. 1 Referring to the drawings, vI have used the numeral 5 to indicate a hollow, cylindrical drier, journaled in sup orts 6 at its ends, which are closed by heads 7 formed with outwardly projecting trunnions 8. The trunnion 8 at one end of the drier is formed with an axial passageway 9 for the admission of steam. This trunnion 8 has a stationary linin 9" over the outer end4 of 'which is secure a cap 10 communicating -with a supply pipe 11.l .The cap 10 is removably through the ca fastened over the end of the trunnion in the usual manner.

Extending axially through the passageway 9, is a withdrawal pipe 12 whlch communicates at one end with an external pipe 13 and at its other end with a pipe 14 opening into the drier near the lower pyeriphery thereof. Connecting the pipes 12 and 14 is an elbow 15. This elbow is formed with an annular baille 16 adjacent to the inner extremity of the passageway 9. The baile ,16 is preferably of such a diameter as to permit its insertlon and withdrawal through the passageway 9, and is so arranged on the pipe 12 that steam entering through the passageway is directed radially from the pipe 12 toward the periphery of the drier, as indicated by arrows in Fig.. 1. With this form of withdrawal pipe shown in Fi 1, I prefer to cut away or flatten the baill 16 as indicated at 17, so that no part of the infiowing steam will be forced to pass directly to the entrance of the withdrawal ipe 14.

Thewithdrawal -pipe shown in ig. 4 differs from that shown in Fig. 1 in that the portion 19 of said pipe, which extends to the bottom of the drier, is formed integral with the axial' portion 12, and the elbow 15 shown in Fig.- 1 is dispensed with, the pipe 19 being merely bent ldownward upon such a radius that it may be withdrawn through the axial passageway 9. To properly direct the iniowing steam with this type of withdrawal pipe, 1 mount a baille 2O upon the horizontal portion of the pipe 12. This baiie 20 is circular and of a size which will permit its withdrawal through the passageway 9. For convenience in securing the baffle 20 to the pipe, the same may be formed with a hub 21 provided with a set screw in engagement with the pipe 12.

`In operation, steam for heating the drier 5 is supplied through the pipe 11 and enters 10 and passageway 9 into the interior o the drier. As the steam reaches the inner extremity of the passa way 9, it strikes the baille 16 or 20, as t e case may be, and is directed radially to the vperiphery of the drier whence it iiows substantially parallel to the axis of rotation, along the walls to which the heat is transmitted. The condensate, trap air and a. portion of the steam then ows or are withdrawnthrou'gh the pipe 14 or 19 into lli the pipes 12 and 13. Air and water from the pipe 13 are collected in suitable headers or receivers andthe steam may be either utilized to heat other driers or condensed and returned to the boiler.

To facilitate making the connection between the pipe 14 and elbow 15 shown in Fig. 1, I provide a removable cover 18 for a hand hole in the head 7 of the drier. Thus, the cover 18 may be removed to allow access to the interior of the drier. It will be evident that no such hand hole is necessary, however, in the arrangement shown in Fig. where th'e baffle 20 and pipe 19 may be withdrawn bodily through the passagewalyI 9.

aving described my invention what I claim as new and desire to protect by Letters Patent is:

1. The combination in a hollow, cylindrical drier having an end journal bearing and an influent passageway through said bearing for the introduction of a fluid heating medium, of a rigid withdrawal pipe extendin axially through said passageway and a ba e fixed on said pipe and arranged near the inner extremity of said passageway to direct the inflowing heating medium against the periphery of the drier.

2.' The combination in a hollow, cylindrical drier having an end journal bearing and a, passageway through said bearing for the introduction of a fluid heating medium, of a baffle disposed concentrically with said passageway within the drier and arranged to direct the inflowing heating medium against the periphery of the drier.

3. The combination in a hollow, cylindrical drier adapted to be rotated and having an end journal bearing and a passageway through said bearing for the introduction of steam to said drier, of a stationary withdrawal pipe extending axially through said passageway, and an annular baffle mounted on said pipe and formed to be inserted through said passageway to the inner end thereof, said baile being arranged, when so inserted, to direct inflowing steam radially against the inner walls of the drier.

In testimony whereof, I have hereunto signed my name to this speciiication.

ARTHUR E. BROUGHTON.

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