US2342058A - Prefabricated stack sections - Google Patents

Description

Feb. l5, 1944- c. E. MORRIS PREFABRICATED STACK SECTIONS Filed April 30. 1943 INVENTOR. masi/ Www 7 Patented Feb. 15, 1944 UNITED STATES rTsNT oFFlcE PREFABRHCATED STACK SECTIONS Charles E. Morris, Dallas, Tex.

Application April 30, 1943, Serial No. 485,207

1i) Claims.

The present invention relates to prefabricated, heat-insulated, high-temperature, stack or chimney sections designed to be superimposed on one another in registered relation to form the cornplete stack, each such section having an outer, tubular, metallic jacket identical in all respects with the complementary jackets and all of which are slightly tapered longitudinally so that the larger end of each one will receive the smaller end of the next jacket, such jackets preliminarily serving as molds or forms for their linings of self-hardening, heat-resisting compositions, the liner terminating short of one end of its jacket but being flush with the opposite end of the jacket or shell. v

An object of the invention is to provide prefabricated stack-sections which require no special skill in their erection, and this aim is reached inasmuch as the sections are merely superposed upon one another and bolted together in such manner that there will be no internal temperature influences capable of causing expansion of the metallic fastenings with possible fracture thereby of the refractory, insulating material of the liners, and further due to the effectiveness of the insulating liners, combined with a heat-resisting cement to seal the joints between the sections, a chimney is provided which will afford permanent resistance to the intense heat of the products of combustion, especially in the' burning of coal.

Another aim of the invention is to supply a sectional stack-construction wherein, if any section of the lining becomes accidentally injured, damaged, or broken, the remaining sections above are independently supported by their metal jackets in such manner that their maintenance in proper operative position does not dependlupon the condition of any lower lining section.

With the foregoing and other objects in mind, the invention has particular` reference to certain features of accomplishment which become manifest as this description proceeds, taken in connection with the accompanying drawing, forming a part of this specification and throughout the views of which like parts have been supplied with the same reference numerals.

In this drawing:

Figure 1 is an incomplete kelevation and a partial, central, vertical sectionof a number of the series of superimposed chimney sections or parts;

Figure 2 is an enlarged, horizontal cross-section on line 2-2 of Figure l; Y

Figure 3 is a fragmentary view showing a chimas extending through an incompletely-illustrated building-roof;

Figure 4 is a fractional, vertical section on an enlarged scale on line 4-4 of Figure 2; and

Figure 5 is a vertical, central section through one of the metallic jackets before its liningr is applied thereto.

Continuing with a more detailed description of the structure presented in the drawing, reference is made primarily to Figure l wherein each numeral l0 denotes a tubular metal shell or jacket, which, while it may be of any suitable cross-section or shape, is, in the present case, cylindrical and slightly tapered lengthwise, its lower smaller end being of such size as to conform to and to be snugly received in the larger end of the next jacket below, as shown.

Within each such jacket or casing Il! there is a liner I I of a cementitious composition of a selfhardening nature and composed of materials known to possess a high resistance to intense heat. l

In applying this composition to the interior surfaces Vof thejackets, the latter serve as the molds or forms and when such stack-sections are completed, their liners constitute a part thereof and aiord the means by which the 4sections are supported in superimposed relation in the completed stack. l

It will be noted from the drawing that the larger, upper end of each Vsuch jacket or casing shell ,Ill is provided with a circular, transverse row Aof spaced-apart apertures I2, I2 and that a similar or like row of holes I3, I3 (Figure 4) ex tends around the smaller end of the jacket, each such hole I3 being in register with the screwthreaded aperture of a nut I4 welded to the inner face lof the jacket, the inner surface of each such nut having welded thereto a cover-plate I5 closing the corresponding end of the aperture of the nut.

Each such nut-equipped jacket has its linermixture spun therein and forced outwardly against its inner surface by centrifugal-force., the jacket acting as a moldand when such linermixture haskhardened, the nuts Ill are rmly embedded in its outer portion adjacent to its lower smaller end, it being understood that the principal function of the lplates or discs I5'is to prevent the entrance of the liner-material, while it is in plastic condition, from finding entrance into the interior of the nuts,

As has been clearly illustrated, each such insulating-lining II is flush with the lowerend of ney constructed according to this invention and its metal-shell I0, but at the upper portion of such casing, such inner coating terminates short of the corresponding end of the jacket in a flat annular surface at a right-angle to the axis of the jacket and at the proper distance below the row of apertures I2.

The nuts I4 are correlated with the apertures I2 in the jacket so that when one stack-section is disposed upon another with the lining of the upper section resting on the lining of the lower section with a suitable joint cement I6 between the two, the apertures I2 will be alignable with those of the holes I3 and nuts I4 and will jointly receive stud-bolts Il which extend through the contiguous walls of the telescoping jackets, thereby firmly securing the sections together.

In this connection, it should be noted that inasmuch as the bolts I'I do not penetrate through the walls of the insulating-linings and the associated nuts are Well embedded in the linings, they are not exposed to sucient heat of the products of combustion rising in the stack to cause excessive expansion and possible damage to the linings.

It is to be observed that by thus constructing the sections, the weight of the assembly is borne by the `superimposed insulating-liners as an adequate support instead of by the bolts and because of this steel of a thinner gauge than would otherwise be necessary can be availed of in the construction of the jackets.

In lining the jackets or casings I8 with the composition, it is preferred that the latter be centrifugally applied by one of the several suitable spinning processes, although it is obvious that an internal form can be used to confine the innerwall surface of the insulating liner.

In any case, however, it is important that the ends of the liners be perpendicular to the axis of the jacket so that the sections themselves, when assembled, will be perpendicular tothe ground to assure against diiiculty in alining the holes I2 with the nuts for the reception of the bolts I'I.

In Figure 3 is shown one authorized method of extending the chimney or flue through and fastening the same to the roof 2I of a building 22.

Usually a clearance 23 is provided between the flue and the wood framework for an air-space and a sheet-metal flashing 24 is placed about the iiue or stack to rest upon the roof as a weather seal.

Manifestly, the construction as shown and described is capable of reasonable modification and such changes as may be construed to fall within the scope and meaning of the appended claims is to be considered within the spirit and intent of the invention and such modifications may be f made without departure from the heart and substance of the invention and without the loss or sacrifice of its substantial benefits and advantages.

For example, the sheet-metal jackets I may be made of sumcient gauge or thickness to support their linings so that the latter do not carry the weight of the stack and this is easily accomplished because of the tapered t of each lining in its jacket and by reason of the tapered t of each jacket in the next lower one, thereby avoiding undue strain on the bolts. y

I claim: Y

l. A plurality of like stack-sections adapted when assembled in superimposed registered relation to form a stack, incorporating the novel characteristics that (a) each such section includes a longitudinally-tapered metal-jacket adapted at its larger end to telescopically receive the smaller end of a like section and at its smaller end to fit telescopically in the larger end of a like section, (b) each said jacket has a heat-resisting, heatinsulating liner having an outer surface conforming to and in contact with the inner tapered surface of the jacket, (c) one end of each said liner is substantially ush with the corresponding end of the jacket, and (d) the other end of each said liner terminates short of the corresponding end of the jacket.

2. A plurality of like round stack-sections adapted when assembled in superimposed registered relation to form a stack, incorporating the novel characteristics that (a) each such section includes an encasing longitudinally-tapered metal-jacket adapted at its larger end to tele.

scopically receive the smaller end of a like section and at its smaller end to t telescopically in the larger end of a like section, (b) each said jacket has a heat-resisting, heat-insulating liner i having an outer surface conforming to and in contact with the inner tapered surface of the jacket, (c) one end of each said liner is substantially flush with the corresponding end of the jacket, (d) the other end of each said liner terminates short of the corresponding end of the jacket, (e) each said jacket has a first transverse circular row of apertures outwardly beyond said noniiush end of the liner, (f) each said jacket has a like second transverse circular row of apertures near the flush end of said liner, (y) each said jacket has internally screw-threaded members secured to its inner surface, each with its screwthreaded passage in register with one of the apertures of said second row, (h) said members are entirely embedded in said liner, whereby by means of bolts occupying registered jacket apertures of said first and second rows and the threaded Dassages of said members, the one end of each said section may be secured to the opposite end of a like section.

3. The novel characteristics in stack-sections set forth in claim 2, in which each of said members is a nut, the threaded passage through which is closed by a plate over its inner end.

4. The novel characteristics in'stack-sections Yset forth in claim 2, in which the flush ends of said linings are adapted to bear on the otherends of the linings of other sections with cement sealing such joints. Y

5. A high temperature flue pipe including a plurality of superimposed sections, eachsection comprising a metallic jacket tapered to conformably receive and be received at its ends by ladjacent jackets, a liner of heat resisting material on the walls of said jacket, one end being ilush with and the other terminating short of the end of said jacket to form a-supporting shoulder for superimposed sections and means borne jointly by juxtapositioned jackets to secure the ends thereof together.

6. In a prefabricated, high temperature chimney, a chimney section comprising a tapered, metallic jacket having an annular row of 'apertures in each end thereof, an insulating liner of self-hardening, heatr resisting material on the interior walls of said jacket, one'end of which is flush with the smallest end of 'said jacket; the opposite end terminating short of the largest end of said jacket to dei-lne an annular shoulder.

7. In a sectional, prefabricated flue pipe, aflue section comprising a metalllic jacket tapered to receive and be received at its ends by identical jackets, a liner of self-hardening, heat'resisting material on the interior walls of saidjacket, one end of which is flush with the smallest-end of sad jacket, the other being terminated short of the largest end of said jacket to dene a shoulder against which bears the smallest end of the next adjacent flue section and means jointly provided in said jacket ends for securing the same in assembled relationship.

8. In a prefabricated, high temperature llue pipe, a flue pipe section comprising a jacket smaller at one end than at the other and having on its inner walls a liner of self-hardening heat resisting material, said liner being flush With the smallest end of said jacket and terminating short of the largest end thereof to dene an annular shoulder and means in each end of said section to effect securement thereof to identical and contiguously aligned sections.

9. A prefabricated high temperature iue pipe comprising a plurality of vertically aligned, telescopically related sections, each comprising a tapered shell containing a liner of heat resisting material, one end of which is flush with the smallest end of the shell, the other end terminating short of the largest end of the shell to dene an abutment for the smallest end of the shell of the next higher section and means for securing the sections in superimposed relationship.

l0. In an insulating liner for metallic tubular bodies, a preformed series of cementitious sections having exterior surfaces conforming to the interior surfaces of said metallic bodies and provided with end portions conforming in shape to that of the end portions of juxtapositioned sections to be ldisposed in end to end relationship in a metallic tubular body and means for establishing a seal intermediate the ends of said sections against the escape of gases.

CHARLES E. MORRIS.

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