US878711A - Straw-cooker. - Google Patents

Description

` 1 PATENTED PEB. 11 J. J. DAUGH & w. P. HARBREGHT.

STRAW GOOKER. APPLIOATION FILED JULY ze, 1906.

www, mkw

UNITED sTATEs PATENT .oFFICE JACOB J. DAUCH AND WILLIAM F. HARBRECHT, OF SANDUSKY, OHIO.

STRAW-COOmR.

To all 107mm it may concern:

Be it known that we, JACOB J. DAUCH and WILLIAM F. HARBRECHT, both citizens ofthe United States, residents of Sandusky, county' of Erie, and State of Ohio, have invented a. new and useful Im rovement in Straw-V (,.ookers, of'which the iollowing is a specifica- 4 tion, the rinciple of the invention being herein explained and the best mode in which we have contemplated applying that principle, so as to distinguish 1t from other inven-4 tions.

,Our invention relates to improvements in pulp-digesters and particularly in those used in cooking straw which Inaterial is extensively used in the manufacture of strawboard and certain kinds of wrapping papers.

Obviously l1owever,'in the use of our cooker the character of the stock is immaterial and such cooker may be employed in the digesting of rags and the like as well as straw and other materials with. equally satisfactory results.

The invention is concerned particularly with the arrangement of and manner of supply of the steam distributing pipes, withm the boiler or shell of the cooker, the object being to provide a `simple valve construction for supplying steam to the submerged pipes only, and to so dispose the apertures whereby the steam escapes from such distributing pipes as to insure the thorough inter-mixture of the. contents ofl the cooker.

Said invention, then, consists of means herein after fully described and specifically set forth in the claims. f

The annexed drawing and the'following descri tion set forth in detail certain means embodying the invention, such disclosed means constitutingbut one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing:w-Figure 1 represents a longitudinal axial cross-section of a cooker embodying my invention; Fig. 2 represents a transversevertical cross-section of the valve whereby steam-is supplied to the steam distributing pipes ofsuch cooker; and

v Fig. 3 shows a transverse cross-section of one of the steam-distributing pipes and the adjacent portion of thecookerwall. 'f

In said `figures, A designates the tank or boiler of our cookerpwhich is shown as being Specification of Letters Patent.

Application filed July Z6. 1906. Serial No. 327.812.

of the approved spherical or globular formu rammed Feb. 1 1, 190s.

Such tank is 'rotatably supported at diametrically opposite points u on gud eons or trunnions a. securely attached to t e boiler shell and turning in suitable bearings a. Of such bearings, however, and corresponding supports a2 ol'- timber or other material, but one appears in the iigures. The means whereby rotation is 'imparted to the tanks are likewise omitted, since they form no of this present invention. As shown in 1, the tank has been partially rotated from its'norma-l, vor charging, position so that the manhole c3, through which access is had to the interiory of the tank, appears on the 'farther side of the half section. 1

The general process of` cooking paper stock, it is takenis ,well enou h understood not to require extensive eX anation here. It will, hence, suflice tosay, that preparatory to the operation, the straw, rags or other stock is introduced into tank A through man- 4hole a3, along with a quantity of cooking liquor of maximum strength. Such liquor it is understood comprises a solution of chemicals adapted to effect a disintegration of the material being treated. Live steam under pressure is thereupon admitted into the tank and the latter at the same time is. rotated so as to agitate its contents and insure. contact ofA the chemical cooking liquor with every portion of the stock. It is to the means that we em )loy forv introducing the steam that it is desired to here call particular attention. For this purpose, one of the trunnions a u on which the tank is mounted is formed Wit an 'axialaperture or bore a, and the portion of the boiler shellv opposite the inner end of this bore is cut away. In the opening in the shell thus formed, is mounted a valve-casing B of the general cylindrical form illustrated in Figs. l and 2.' Such casing B is' provided, equidistantly spaced about its cylindrical face, with a plurality of openings b. Into these openings are screw-threaded the ends of steam-distributing pipes B that are meridionally dis osed within the boiler, being attached to t e inside of the Walls of such boiler by means of clips b and having their outer ends, which converge towards the portion of the boiler opposite to valve-casing B, closed by means of caps b2. The steam sma openings b3 that are arranged in stagescaHes from distributing pipes B through' votherwise securely mounted'upon the inner .tributing pipes B', which it will be rememby this method of operation are highly valuable in that the collection of sediment as gered order on the side of the pi es turned l towards thehboiler wall. To in icate still41 more definitely the preferred' disposition of i these apertures b3 they may be described as bein alternately located on o posite sides of aline drawn longitudinally a ong the pipe on its outer face and at an angle laterally divergent therefrom f'about forty-five degrees. This construction quite clearly ap pears in Fig. 3.

The steam for steam-distributing pipes B is received through a pi e B2 connected at its outer lend with a suita le source of supply and extending inwardly throughthe bore 0,4 in trunnion a so as to terminate within valvecasing B. A stufiing box a5 and gland a provide a bearinfJr for the outer end of supply pi e B2,'which obviously remains stationary W lile the tank revolves. 4Fitting within valve-casing B, 'and screw-threaded, or

end of su ply pipe B2, is a cylindrical valve b4. As s lown in Figs. 1 and 2, valve b4 is provided with a port b5 adapted to uncover at any one time the ends of but two disbered are connected with opening 2)' in valvecasing B. As appears in Fig. 2 the disposition of valve b4 is such as to turn ort b5 Adirectly downwardly,` asa result of w ich it is seen that steamis supplied to the two lowermost of distributing pipes B only, that is to the ones that are successively submergedv by the semi-liquid contents of the boiler as the latter rotates on its axis. The general mode of operation of our improved straw-cooker has been' incidentally set forth in connection with the description given of its structure. In conclusion then it remains to state what are the new results at? tained by our improvements. First of all it should be remarked that we do not set up as broadly new the lregulation of the supply of steam to distributing-pipes B so as to cut off all but those that are submerged. We do, however, set up the construction of the valve whereby this result is achieved as being simpler in'construction and operation than any heretofore devised for this purpose so far-as we are aware. By the arrangement of the apertures b3 in distributing pipes B', the steam as it escapes from the submerlged pipes to which it is thus supplied, is .irst directed downwardly, or outwardly lagainst the Walls of the boiler. The results secured well as ofstock unaffected by the chemicals in the Hcooking liquor along the walls of the boiler is prevented, sincej'the escaping jets of steam are made to penetrate to the very bottom of the mass and in rising permeato the whole. A uniform, as well as thorough cooking of the stock is thus eected.

Having thus described our invention, that which we particularly point out and distinctly claim, is z l1. ln a pulp-digester, thev combination with a rotary boiler, of meridionally .arranged steam-distributing pipes within said rotary b'oilerand disposed against the inside of the walls thereof, said pipes being respectively provided with apertures for the escape of stelam on the side adjacent to the tank-walls on y.

2. In a ulp-digester, the combination of a rotary boller, a steam supply pipe, a series of meridionally arranged steam-distributing pipes within said boiler, said pipes being connected with said-supply pipeand being re# spectively provided with apertures foiythe escape of steam on the side adjacent to the walls only of said rotary boiler, and a yvalve controlling connection between said sup ly pipe and said distributing pipes, said va ve eing adapted to connect such supply pipe with a plurality of distributing pipes successively submerged in the course of said boilers rotation.

3. In a pulp digester, the combination of a spherical boiler rotatably mounted -upon trunnions, one of said trunnions being rovided with an axial bore, a cylindrical va vecasing fitted .in a recessed portion of one of the trunnions and having one end closed and mounted with the other o )en end over the inner end of such bore, ya pllurality of meridionally arranged steamdistributing pipes within said boiler, each pipe having apertures for the escape 'of steam on the side adjacent to the walls only of said rotary boiler, said pipes being connected with said valve-casing, a steam supply pipe mounted in the -bore in said trunnion and extending within said valve-casing, and a cylindrical valve mounted within said casing and connected with said supply pipe, said valve being provided "with a port disposed to connect said supply pipe with a plurality of distributing ipes successively submerged in the course o said boilers rotation.

Signed by JACOB J. DAUCH, this 11th day WILLIAMF. HARBRECHT.

Attested by:

FRED EMMoNs, L. D. MonroN.

Images