US1881228A - Pouring spout - Google Patents

Description

Oct. 4, 1932. c P E 1,881,228

POURING SPOUT Filed April 20, 1929 INVENTOR,

(/2 ea zer Pap 8. BY

ATTORNEY Patented Oct. 4, 1932 CHESTER H. PAPE', F PORTLAND, OREGON rename srou'r Application filed April 20,

for furnaces and containers of material maintained at substantially high temperatures and which materials at such temperatures adhere. to cast iron and other metal spouts. Because of such adhesion, it is common practice to provide spouts of soap stone or similar material to which such matter does not adhere. Soap stone is a very fragile material and relatively short lived for this reason.

My invention relates especially to furnaces in which the residual black liquor taken from the sulphite process of making paper is sprayed and incompletely burned,the resi-' due forming a molten slag. I have discovered that if a cast metal pouring spout is maintained at a substantiallylower temperature than the heat of the slag, that such adhesion will not take place. The molten slag passing over such cooled surface sets up tremendous strains in the spout itself due to differences in temperature thruout the thickness of thespout and such strains tend to break down such material and in a water cooled wrought iron, or of similar material having the property of high tensile strength, are used to constitute the'conduits for the cooling water that such differential strains, although cracking the cast metal spout, will not fracture such conduits, which thus serve as a sealing medium. This is especially true if the pipes are continuous, that is, made of a single length of pipe without couplings '01,- other projecting joints and if such pipes or tubes-are covered with a protective material prior to their insertion' into such cast metal spout to prevent the .molten metal from adhering to the surface of the pipe. Such coating can be destructible under the action of the molten metal, so that'an air chamber is created between the exteriorjof the pipe'and the bore of the opening in the casting. Such coating material may also be of material re- 1929. Serial No. 356,767.

fractory to heat but non-adhesive to the molten metal, so as to permit differential expansion in the pipe and in such casting. The end to be attained in either case is to prevent the differential strains set up in the casting, because of unequal application of heat, from rupturing or fracturing the pipe.-

The details of construction and the mode of operation of my invention are hereinafter described with reference to the accompanying drawing, in which: v

Fig. 1 is an elevation showing a typical installation of a spout of this character;

Fig. 2 is a plan view of such spout showing the arrangement of the cooling passageways therein and Fig. 3 is a transverse section thru such spout showing the arrangement of the pipes constituting the cooling passageways located in the spouts.

My improved spout is adapted to be used in connection with a furnace or container a having a sloping bottom a leading to a discharge opening a2 thru one side, under which my improved pouring spout b is located. One end of such spout rests upon a shoulder a and extends laterally therefrom, the free end being supported by angularly disposed rods d, or similar tension members, extending upwardly from such free end. Such rods are fastened to lugs 6 formed upon the sides of the spout. The molten slag discharges from the end of the spout 1) into a receiver e, from-which it is carried off by a suitable apparatus which has'no bearing upon this invention.

Such spout is preferably elongated and the pouring surface 52 is trough shaped, preferably curved laterally, and the spout is of substantially uniform cross section. Located centrally in such spout is a continuous coil of pipe or tube f, with which my invention is particularly concerned, which pipe or tube defines a tortuous passageway for the cooling water and lies under the pouring surface b2 of the spout, for substantially its entire length and breadth. In practice it is not practical to obtain a length of pipe sufficiently long to constitute the entire coil f and thus several lengths of pipe are joined together by welding, so that such pipe has a uniform external diameter and is without threaded connections. The ends of such coil extend upwardly and are connected to a supply of water which circulates thru the coil either under 'pumped pressure-or by thermosiphon means, preferably by the former means." Such pipe is covered by a layer of material from one-eighth of an inch thick 'to one-sixteenth of an inch thick prior to in- 'sertion in the mold in which the spout b is 'cast. The preferable coating material for the pipe is made of a mixture of approximatelyequal parts of graphite and shellac.

The end to be attained is to provide a layer of material or coating overthe pipe which prevents the adherence-of the molten metal of which the spout is made upon the pipes during such coating process and such material is either refractory to heat and does not adhere to the cast metal or the heat destroys the consistency of the coating so that it tion remaining of a protective coating of being separated from said body by any portion remaining of a protective coating of material comprising a mixture of graphite and shellac, which material shcathes said conduit lvvlilen the latter is encompassed by said cast In testimony-whereof he has aflixed his.

signature. I I CHESTER H. PAPE.

crumbles away to leave an air space surrounding the pipe and inside of the passageways in the spout in which the pipe lies. The absence of projecting portions in the pipe permits independent expansion and contraction-which eliminates the developing of differential stress tending to fracture the pipe and the freedom of adhesion between the cast' metal spout and the pipe prevents.

strains set up in the spout from being transmitted to the pipe. passed over such spout in the installation which I'am describing and which I have illustrated in Fig. 1 attains-a temperature of aproximately two thousand degrees F. while it is desirable to keep the spout as close to atmospheric temperature as possible. Thus the upper surface of 52 of the spout tends to elongate, because it is in direct contact with such hotliquid and such elongation and such tendency towards elongation is so severe The liquid material.

that fissures and cracks-are formed which extend from such surface I claim: 1. In a pouring spout comprising a cast bod defining-a trough-like surface adapted inwardly of the spout.

to 'rect hot liquid substances and a cooling conduit loosely housed within said body at "a point immediately belowsaid'surface.

- 2. In a pouring spout comprising a cast body defining a trough-like surface. adapted to direct hot liquid substances, a cooling conduit loosely housed within said'body at a point immediately below said surface, said conduit extending substantially the entire length and breadth of said trough-like sur ace. 3. In a pouring spout comprising a cast body defining a trough-like surface adapted to direct hot liquid substances, a cooling conduit housed within said body a; a point immediately between said surface, said conduit beingsepara-ted from-said body by any por is encompassed by said cast

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