US2316519A - Brick pan for boilers - Google Patents

Description

April 13-, 1943. B. LABARE:

BRICK PAN FOR BOILERS Filed A11g. 15, 1941 Sheets-Sheet l INVENTOR Labaree ATTORNEY Begbmz'n April 13, 1943. B. LABAREE' BRICK PAN FOR BOILERS Filed Aug. 15, 1941 Sheets-Sheet 2 INVENTOR flery'amin 4 61117078??? BY 1? 'ATTRNEY 5 Patented Apr. 13, 1943 UNITED srrs BRICK PAN FOR BGHIERS 7 Benjamin Labaree, Philadelphia, Pa, assignor to Edward G. Budd Manufacturing Company, Philadelphia, Fa a corporation of Pennsylvania Applicationhugust 15, 1941, Serial No. 407,020

4 Claims.

The invention refers to a supporting structure for fire bricks which are arranged below the burners of steam boilers. Such supporting structures are generally called brick pans.

An object of the invention is a brick pan which is unusually light and yet strong so that, when used for a boiler of a ship, the payload can be increased correspondingly to the saving of weight for the brick pan.

An object of the invention is also a brick pan which is gas-tight so that it may form part of the boiler enclosure.

Another object of the invention is a brick pan which, except when damaged by an outer force, does not require maintenance Work or repairs and which has an extremely long life, in fact a life equal to or surpassing the life of the boiler proper or of the ship in which it is used. These objects are of great importance in structures such as ships where the brick pan is not accessible at all or at least where it is difiicult to reach certain parts thereof. Said objects are furthermore extremely important for ships such as destroyers which may be laid, up in peace time for many years but which should be capable of being taken into use at any moment in the case of an emergency with the very minimum of time for recon ditioning.

The objects of the invention are largely achieved by making the entire brick pan of stainless steel such as austenitic stainless steel having for instance, 18% chrominum and 8% nickel, the strength of which is materially increased or even doubled by cold work, and by uniting the members of the pan by a spot welding procedure which does not deleteriously interfere with the corrosion resistance and the cold-work stren of the material.

The objects of the invention are furthermore achieved by the use of box-section main girders or beams which are interconnected by a continuous panel forming thesupport proper for the bricks and by spaced reinforcing rails or braces, all said elements being united such as by spot welding into one integral structure.

Further objects, advantages, and features of the invention will become apparent from the embodiment which is illustrated in the attached drawings and described in the following.

In the drawings;

Figure 1 is a diagrammatic vertical transverse section through a boiler structure with a brick pan according to the invention;

Figure 2 is a perspective View of "one section of the brick pan on a larger scale than Figure "1;

beams 29 are sheet metal panels 32 Figure 3 is a fragmentary section through the brick pan as shown in Figure 1 but on a still larger scale;

Figure 4 is a fragmentary section inthe plane of line l-4 of Figure 2;

Figure 5 is a perspective fragmentary view of a corner portion of one of the main supporting beams. v

The boiler illustrated in Figure 1 comprises two upper drums 5, 6', three lower drums l, 8 and 9; and several banks of boiler tubes l0, l l I 2, l3 and It. The burners are arranged in the space between the tubes H and I2 and between the tubes l3 and l4. i5 is a space for so-callecl econo-' mizer tubes.

The entire structure so far described is enclosed by a double Walled structure 16, IT and [8 and'by the brick pan structure [9. The latter is arranged between the lower drums l and 8.

The brick pan comprises several sections one of which is shown in Figure 2. The sections are arranged side by side in the direction perpendic ular to the plane of Figure l and are connected to one another along their meeting margins.

Each brick pan section comprises three main supporting beams 20 which are arranged parallel to and spaced from each other and from the transverse side margins of th section. Each beam 20 consists of a channel having a bottom Wall 2 I side walls 22, marginal flang 23, and of a cover plate 24 which overlaps and is fastened, such as by spot welding, to the flanges 23. At the points where the beams 20 are bent, the walls 22 and the flanges 23 are transversely cut and the gap at the corner is closed and the corner itself reinforced by bracket plates 25 and their flanged portions '26. The plates 25, 28 are welded respectively to the side walls 22 and to the cover strip 2d. i

Arranged transversely to the beams 20 are Z- section rails 27 having a web 28 and and arms 29 and 30. Angle bracket plates 3i connect the ends of rails 27 to beams 25, having one of their arms fastened to one end of a web 28 and the other arm to the adjacent portion of a beam wall 22. The arms 29 of rails 21 are arranged in one plane with the adjacent portions of the bottom walls 2! of the beams 29.

Fastened, such as byspot welding, to the arms 29 of the rails 27 and the bottom walls 2! of the Each panel 32 is of such a width as to extend from one beam 20 to the next or to theadjacent lateral margin of the structure. The different panels 32 overlap eachother at 33 in the region of the beam 20', the

side edge of one Of the adjacent sheets 32 being for this purpose outwardly offset as shown in Figures 2 and 4.

The lateral outenmargins of the panels or sheets 32 are reinforced by angle section strips or beams 34. Brackets 35 have one of their arms welded to the free arm of the beam 34 and a bent-off tongue 36 connects to the adjacent outer end of the rails 27. Holes 31 in the beams 34 serve for connecting adjoining brick pan sections to one another or to an end wall of the boiler casing by means of screw bolts, rivets or the like.

The side margins of the panel sections are reinforced by flat strips 38 and are likewise provided with holes 39. These holes 39 serve for the attachment of the pan to brackets 40 which may be welded to the drums I and 8.

4| are ridges welded to the lower portion oi the pan structure which serve to hold the inclined parts of the brick lining 42.

All the parts of the described brick pan section are Welded to one another by spot welding in such a manner that the corrosion resistance and the strength of the material are not adversely aifected.

The experience so far gained has proven that with the new structure, all the objects are achieved which have been outlined in the preamble of this specification. It is believed that structures built in accordance with the invention will stay serviceable for an unlimited length of time in view of the fact that the material used austenitic stainless steel of the so-called 18-8 type-is practically incorrodible by the agents to which they may be subjected, due to the fact that the corrosion resistance and the cold-work strength of the material is not impaired by the welding process, and due to the fact that the brick lining prevents any heat which might adversely influence the material, from reaching the pan proper.

Although one embodiment only of the invention has been illustrated and described, it is obvious that anybody skilled in the art may design minor changes or adapt the form of the pan to the specific requirements of different boilers without departing from the spirit of the invention. Certain boilers, for instance, make it advantageous to arrange the box-section beams longitudinally and the Z- or angle section rails transversely. All such modifications and adaptations of the invention are intended to be covered by the appended claims.

What is claimed is:

1. A sheet metal brick pan sub-assembly unit capable of being handled and shipped as a unit and having its margins formed with reinforced joint structures for assembly with adjacent parts of a boiler casing, said unit comprising longitudinal beams, transverse rails and a cover panel, all fabricated out of light gauge sheet metal, said longitudinal beams being of hollow cross-section and extending continuously from end to end of the unit in parallel relation spaced from each other, said transverse rails being of angular cross section and small cross sectional area as compared with said beams and being disposed normal to the beams with one of their arms in substantially the plane of the inner walls of said beams and being arranged in parallel relation spaced from each other, another arm of said rails being joined to the adjacent side wall of a beam, and the cover panel overlapping the inner walls of said beams and the first-named arms of said rails throughout their extent and being joined thereto substantially throughout the overlap, whereby an integrated structure results in which the parts mutually reinforce and brace each other thereby combining great strength and rigidity with low weight.

2. A brick pan section for boilers fabricated of light-gauge sheet metal, comprising a generally rectangular elongated structure as seen in plan and having parts thereof extending in different planes in the direction of its length, the section comprising a light-gauge metal panel extending over its entire inner face, spaced parallel longitudinally extending hollow section beams extending continuously the length of the section and overlapping said panel through one of their walls and secured thereto in the overlap, angular reinforcing and attaching members extending the length of the panel and secured through one of their arms to the side margins of the panel, and longitudinally spaced stiffening members of angular section and of materially less depth than said hollow beams having one of their arms overlapping the panel and secured thereto in the overlap, said stifiening members extending between the hollow beams and between the beams and the angular attaching members, and brackets joining each end of each of said stifiening members to one of said hollow beams or attaching members, the section so fabricated being strong and rigid with the parts mutually strengthening and bracing each other to render it Well fitted for prolonged use and capable of being handled and shipped as a unit.

3. A light weight unitary sheet metal brick pan section capable of being handled and shipped as a unit comprising longitudinal beams, transverse rails and a cover panel all fabricated out of light gauge sheet metal, said longitudinal beams being of closed box-section and extending continuously from end to end of said section and being disposed in spaced parallel relation with respect to each other, said rails extending normally to said beams, being of angular section and being also disposed in spaced parallel relation to each other and being of a depth substantially less than the beams, one arm of said angular section rails being disposed in substantially the same plane as the inner wall of the adjacent-section of a beam, and another arm being connected to the adjacent side wall of the beam, and the cover panel being connected to the inner walls of said beams and to the first-named arms of said angular section rails substantially throughout the lengths of said beams and said rails, all the connections being by spot welding to avoid weakening the structure but to integrate it into a structure in which the parts mutually reinforce and brace each other, thereby combining great rigidity and strength with low weight.

4. A brick pan structure of sheet metal for boilers or the like having a depressed generally horizontal central portion and inclined side portions and comprising longitudinal beams, transverse rails and a cover panel, said beams being arranged parallel to but spaced from each other and extending continuously from end to end of the structure, the rails being of angular section and also arranged parallel to but spaced apart from each other and of a depth substantially less than the depth of the beams, one of the arms of said rails being arranged insubstantially the plane of the upper wall of the adjacent section of a beam and another arm of the rails being connected to the adjacent side wall of a beam, the cover panel being connected to the upper walls of said beams and to the firstnamed arms of the rails substantially throughout the length of the beams and the rails, the beams being each comprised of a channel memher having its bottom wall secured to the panel and having lateral flanges from its side walls, said side walls and lateral flanges being cut at the points where the central portion of the structure merges with the inclined side portions,

BENJAMIN LABAREE.

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