US1145530A - Dipper for driers in paper-making machines. - Google Patents

Description

J. W. VEDDER.

DIPPER FOR DRIERS 1N PAPER MAKING MACHINES. APPLICATION FILED FEB. 28, I913.

2 SHEETS-SHEET 1- Wbtmeooeo Patented July 6, 1915.

J. W. VEDDER.

DIPPER FOR DRIERS IN PAPER MAKING MACHINES.

APPLICATION FILED FEB.28, 1913.

Patented July 6 2 SHEETSSHEET 2.

z m v m a JOHN WARREN VEDDER, 0F WILMINGTON, DELAWARE.

JDIPPJER FOR DRIJERS IN PAPER-MAKING MACHINES.

Specification of Letters Patent.

Patented July 6, ilhth.

Application filed February 28, 1913. Serial No. 751,278.

To all whom it may concern:

Be it known that I, JOHN.WARREN Vnn- DER, of Wilmington, Delaware, have 1nvented a new and useful Improvement in Dippers for Driers in Paper-Making Machines, which invention is fully set forth in the following specification.

This invention is especially designed tov provide means, more particularly of the dipper type, for draining water of condensation from the interior of rotating drying cylinders or drums (commonly known as driers) used in paper making machines; but the invention is obviously applicable to drums or cylinders used in other classes of machinery. Dippers used for this purpose are fixed within the drum or-cylinder and in rotating therewith scoop or dip up the water (as fast as the steam condenses) and elevate it to the discharge orifice or pipe leading through a hollow trunnion of the revolving cylinder, through which trunnion steam enters the cylinder around said discharge pipe. Without some such means for removing water during rotation of the cylinder, such water would accumulate up to the level of an outlet opening through the trunnion. Drying cylinders or drums thus used in paper making machines vary in diameter from approximately two to twelve feet, though the majority of them range from four to five feet. In length they range from one hundred to two hundred inches, while their peripheral speed ranges from approximately two hundred to seven hundred and fifty feet per minute. These conditions of size and speed vary with the character of paper being manufactured and with other requirements which it is unnecessary to here detail. It has been found that dipping means operable satisfactorily in a drum running at ordinary speeds do not eficiently remove the water when the speed of rotation is materially increased, as is sometimes desirable. Such failure may, for example, be due to the shortening of the time given the water to run through the dipper to the discharge pipe with consequent failure of all the water to drain from the dipper, in which case the water remaining in the dipper reverses its movement therein and starts to flow back into the cylinder with a sucking action probably meeting and obstructing the movement of other water entering the dipper as the latter again begins an upward movement. Such so-called shuttle action of the water is very detrimental to the efi- 'cient and successful operation of dipping means. For similar and other reasons, constructions operable satisfactorily with cylinders of small diameter have been found inefiicient and unsatisfactory with cylinders of large diameter. When the running of paper machinery embodying drying cylinders is stopped the water of condensation continues to accumulate therein until it rises to the level of an outlet and thus the cylinders sometimes become half full of water. When the machine is again started, the dippmg means must be capable of removing all of such accumulation of water and then continue to remove such other water as is continually forming therein while the machine is running. For such reason dipper means must also have the capacity of worln'ng in and removing a considerable depth of water.

The objects of this invention generally are to provide a construction of dipping means capable of efficient operation under all of the above recited variable conditions, of simple durable construction, relatively inexpensive, light in weight, of such proportions as to facilitate installation and removal through manholes, and one which will balance with reference to the axis of rotation. These and other important objects have it is believed been attained by the present inven- I tion which provides a structure which has been operated with complete success in a cylinder rotating with a peripheral speed of as high as twelve hundred feet per minute.

The accompanying drawings illustrate what is now believed to be the preferred embodiment of the invention, but as will be readily appreciated the invention may receive mechanical expression in many other forms.

Figure 1 is an end elevation with the drying cylinder in section on line 11 of Fig. 2; Fig. 2 is a section on line 22 of Fig. 1; Fig. 3 is a transverse section on line 3-3 of Fig. 2; and Figs. 4 and 5 are sectional views similar to Fig. 3, but showing the dippers in different rotative positions.

10 is a revoluble drier cylinder drum or the like, closed at one end by a head 11, the latter having thereon a tubular trunnion 12 through which steam may pass into the cylinder about the water discharge pipe 13 con centric to the axis of rotation. At its inner end pipe 13 is threaded into an opening 14: through one side wall of a double or plural tit compartment receiving-chamber 15, a corresponding opening in the other side wall of said chamber being closed by a plug 16. Said pipe 13 and opening 14 constitute a dis charge outlet common to all of the chambers or compartments. When the dipping means is positioned in the opposite end of the cylinder from that shown in-Fig. 2, the positions of pipe 13 and plug 16 are reversed. The double receiving chamber is preferably of cast metal, though it may be of sheet metal. In side view it is of rectangular form except that at two of its diagonally opposite corners it is rounded, the curved walls 17, 17 of these rounded corners being continued inward, between the side walls-18, 18', and in an approximately involute curve toward the axis of the cylinder and there terminating in parallel straight portions 19, 19' which overlap on opposite sides of the discharge outlet 14 and serve as bafiies. The space between such parallel portions 19, 19 is approximately the vdiameter of said outlet and constitutes an intercommunicating passage between the two chambers or compartments with the outlet 14 midway of the ends of said passage. There are also thus formed 1n the receiving chamber structure two diagonally opposite openings into which extend the inner ends respectively of two curved dippers 20 and 21, short bolts 22, 22, 22, 22', fastening the parts together. The receiving chamber is secured to and rigidly supported from the cylinder head 11 by two bolts 23 and 24. The two curved trough-like dippers terminate at their outer ends near and approm'mately in contact with the peripheral wall of the cylinder and each dipper is secured directly to the cylinder by a bolt 25 and straps 26, 26, with hooked ends engaging over the side edges of the dipper, all as clearly shown at the bottom of Fig. 2.

In the before described double or plural dipper construction, it will be noted that there is a balancing or symmetrical disposition of the dippers and other parts within the cylinder and with relation to the axis of rotation. From the outer or receiving end of each dipper to the discharge outlet 14 of the receiving chamber, there is a water conduit the bottom wall of which is approximately an involute curve. While as before stated, said discharge outlet 14 isconcentric to the axis of rotation, each dipper discharges into its portion of the double receiving chamber eccentrically to said axis. If one of the dippers in its sweep through the water of condensation picks up more water than can be discharged through outlet 14 and pipe 13, the excem will spill over the sides of the trough-like dipper and overflow the receiving chamber'falling back to the bottom of the cylinder and will not run backward through the dipper with the detrimental shuttle action heretofore menrmaeso tioned. Furthermore, in a structure such as illustrated, there is no opportlmity for the formation of obstructive vacuums which have been found to give much difliculty in some forms of tubular dippers.

Figs. 3, 4 and 5 illustrate several phases of the operation of the apparatus. Fig. 3 is intended to show that dipper 21 in its movement has picked up so much water as to overflow the sides of its trough-like conduit at point a. If with the dipper still further advanced, as shown in Fig. 4, there is more water in the receiving chamber than can be carried ofi? through discharge outlet 14, then the excess will overflow back into the cylinderat the point 6. Such overflowing, as illustrated in Figs. 3 and 4, is likely to ocour only when, due to stopping of rotation of the cylinder, a'considcrable amount of water of condensation has accumulated in the bottom of the cylinder and will discontinue 'as soon as the accumulation has been reduced to that usual in the ordinary run ning of the cylinder. Fig. 5 is intended to illustrate conditions more normal to the ordinary operating conditions, some of the water a scooped up by dipper 21 still re- ,maining on one compartment of the receiving chamber and in the processes of discharging through outlet 14. The water (2', delivered into the other compartment by dipper 20, has not yet been elevated (by rotation of the cylinder and dipper mechanism) to the point of overflowing the end of wall 19 and finding its way to discharge outlet 14; and by the time water (Z is elevated to the outlet 14, approximately all of the water 0 will have been discharged.

Practical operation shows that the discharge of water from pipe 13 is approximately constant and regular, rather than intermittent or by gushes.

It will be observed that in addition to the functional advantages already mentioned a device embodying my invention has certain important structural advantages. The receiving chamber 15 is preferably formed as shown of cast-metal and the dippers are preferably formed as shown of rolled-steel channels. In order to insure the firm contact of the inner ends of the channels with the walls of the chamber the contacting parts are both made flat. It will be appreciated that if the walls were constructed with curves at the contacting parts the curves would vary from each other slightly because of inaccuracies of construction and a loose fit would result. Furthermore the inner ends of the channel dippers contact not only with the fiat side walls of the chamber but also with the flat end walls thereof thus being held against relative angular movement.

What I claim is 1. The combination of a revoluble hollow cylinder or drum, a hollow supporting trunatteo ma nion for the cylinder, a discharge pipe extending through the trunnion, a liquid containing chamber communicating with the pipe and centrally positioned in the cylinder to be adapted when supplied with liquid to maintain a continuous flow thereof through the pipe, a plurality of curved dippers equally spaced angularly and extending from the inner periphery of the cylinder to the said chamber, the tops of the dippers be ing open adjacent their points of communication with the chamber to permit overflow of excess liquid, and baflies in the chamber for preventing the unobstructed flow of liquid from one-dipper to another.

2. The combination of a revoluble hollow cylinder or drum, a hollow supporting trunnion for the cylinder, a discharge pipe extending through the trunnion, a plurality of curved dippers equally spaced angularly and having their outer ends near the inner periphery of the cylinder to the said chamber, and a liquid containing chamber communicating with the discharge pipe and with the dippers at their inner ends and being centrally positioned in the cylinder to be adapted when supplied with liquid to maintain a continuous flow thereof through the pipe, the tops of the dippers being open adjacent their points of communication with the chamber to permit overflow of excess liquid and the said chamber being provided with overflow places supplemental to and separate from the dippers.

3. The combination of a revoluble hollow cylinder or drum, a central discharge pipe, a liquid containing chamber communicating with the pipe and centrally positioned in the cylinder, two oppositely positioned curved dippers extending from the inner periphery of the cylinder to the said chamber, and two parallel baiiles in the chamber on opposite sides of the pipe entrance forming a space with the ends of which the said dippers respectively have unobstructed communication, liquid being at all time free to flow by gravity into the said space.

4. The combination of a revoluble hollow cylinder or drum, a central discharge pipe, a liquid containing chamber having outward extending walls, the inner parts of the said walls being involute in form and the outer parts being straight, and dippers having outer involute parts extending to the inner periphery of the drum and inner straight parts engaging respectively the straight parts of the said walls.

5. The combination of a revoluble hollow cylinder or drum, a central discharge pipe, a liquid containing chamber having an inner parallel walled space communicating directly with the pipe and provided with walls extending outward from the said space, the inner parts of the said walls being involute in form and the outer parts being straight, and dippers having outer involute parts extending to the inner periphery of the drum and inner straight parts engaging respectively the straight parts of the said walls.

6." The combination of a revoluble hollow cylinder or drum, a central discharge pipe, a liquid containing chamber generally rectangular in form and having flat end walls and having side walls flat at their outer ends and curving inward, and channel shaped dippers having their inner ends extending into the said box and engaged by the said end walls and the flat parts of the side walls.

In testimony whereof I have signed this specification in the presence of two subscrib- 1ng witnesses. I

JOHN WARREN V'EDDER.

Witnesses:

H. E. LE ELBERT H.

i Nnnsn.

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