US1777196A - Baffle or shield for superheat flues and breechings - Google Patents

Description

BAFFLE OR SHIELD FOR SUPERHEAT FLUES AND BREECHINGS Filed May 23, 1928 2 Sheets-Sheet l.

, ATTORNEY Sept. 30, 1930. w. M. CONNERY BAFFLE OR SHIELD FOR SUPERHEAT FLUES AND BREECHINGS Filed May 23, 1928 2 Sheets-Sheet 2 INVENTOR Patented Sept, 30, 1930 PATENT OFFICE WILLIAM MILLS GONNERY, OF PHILADELPHIA, PENNSYLVANIA BAFFLE OR SHIELD FOR SUPERIIEAT FLUES AND BREECI-IINGS Application filed May 23,

The present invention relates to the art of superheat fines and breechings, and, experience in this art has disclosed the fact that soot, particles of corrosion and other foreign matter and moisture collect in the accordion type or eXpansible stiffening ribs of the walls of the fines, possibly deteriorating the construction and tending toward eating away the metal.

In the above statement the inventor has reference to such expansible stiffeners or accordion type as are shown in United States Letters Patents to William M. Connery, May 16, 1922 and November 2, 1926, Patent Numbe'rs 1,416,334 and 1,605,513.

While there is a certain amount of corrosion and moisture and other collections retained in the hollows of these eXpansible ribs, there is not a great quantity, for the reason that a substantial portion of these collections is dislodged, due to the eddy currents that may be created in the hollows of the expansib le ribs as a result of the passage of the proclucts of combustion through the flue or breeching. However, such eddy currents vary at different times, due to the fact that the products of combustion pass through the flue with varying velocity. For instance, the source from which the products of combustion emanate vary in heat volume, and then again the draught varies. When the products of combustion pass slowly there are less eddy currents, and it is possible that the soot may collect, and eventually suflicient will adhere in the hollows of the ribs, which will cause the previously mentioned deterioration of the flue construction.

To overcome these disadvantages and to preserve the flue construction, thereby rendering the fine or breeching more durable and extending its life, it is the purpose to provide an improved baffle, shield or cover to prevent'the soot and what moisture as may exist from collecting in the stiffening ribs,

*it being the aim to fasten such shields or covers to one side of the stiffening rib of the accordion type and particularly to the side first reached by the flow of the products of combustion, the other portion of the shield or cover being free and unattached, not in any 1928. Serial No. 280,008.

way preventing the necessary expansion of the opposed walls of the stiffening rib.

Another purpose is to provide such a shield or cover for extending across the hollows of the stiffening ribs in the bottom of the flue or breeching and up along the side walls of the fine or breeching a substantial distance, still covering those portions of the stiffening rib which are formed through the side of the fine, thereby preventing such coliections entering the sides of the stiffening ribs.

A still further purpose is to provide eX- tensions at the tops of the sides of the shield or cover, to fit into the hollows, to prevent the collections from dropping down into the hollows, and thereby collecting in the lower portions of the stiffening rib. It is to be noted that the invention is not to be limited to the height of the shield or cover at the sides, or in its anchoring means.

It is to be understood that the particulars herein given are in no way limitive, and that while still keeping within the scope of the invention, any desired modification of details and proportions may be made in the construction of the device according to circumstances.

The invention comprises further features and combination of parts to be hereinafter set forth, show in the drawings and claimed.

In the drawings:

Figure 1 is a view in perspective of a portion of a fine or breeching, showing a substantial portion thereof and illustrating an expansible stiffening rib of the accordion 7 type, and illustrating a portion of the interior of the flue or breeching, showing the appli- 'ation of the cover or shield.

Figure 2 is a sectional View through a fine or breeching showing several of the expansible stiffening ribs of the accordion type and also illustrating the shield or covers.

Figure 8 is a transverse sectional view, showing how the shield or cover extends up the sides of the fine or breeching, to cover the side portions of the hollows of the expansible stiffening rib.

Figure at is an enlarged detail View of the parts of one of the covers, more clearly showing its detailed construction.

ill

Figure is a modified form, wherein the cover or shield is made of three sections.

Figure 6 is a detail view showing where one cover is made an integral oart of the plate having the stillenin rib.

Referring to the drawings 1 identifies a section of a flue or breeching, which is composed of metallic plates, it being borne in mind that the plates are not of the sheet metal type, but the plate metal type, there being a vast difference con'nnercialiy between the two.

These plates are formed witl what are known as expansible stiffen? ribs, such as shown in the aforesaid patents, and'which are constructed by formin die iown in United States Letters Patents Numaers 1,534,299 and 1,535,295.

These expansible stifi'ening ribs 2 are constructed relatively deep and at infrequent intervals throughout the flue, hence previously stated, they retain collections of foreign matter such as corrosion, soot and moisture, and to prevent this a shield or cover 3 is provided. This cover or shield may be in one section, or in several sections, as shown in Figures l and 5. As shown in Figure the cover is in one section or piece consisting of a horizontal portion 5, and the upstanding side portions 6. The horizontal bottom portion and the side portions 6 are fastened in any approved way, for instance by riveting or electric welding as at 7, adjacent the side of the rib first approached by the flow of the products of combustion, said flow being indicated by the arrow a.

As shown in Figure 6, it is possible to construct this cover adjacent at least one of these ribs and integral with the plate from which the rib is constructed, by bending over the edge portion of the plate as at 8.

The cover 3 is free and unattached at its opposite portion, and thereby in no way interfering with the expansible action of the stiffening rib, and furthermore the cover lies closely to the wall of the flue on the other side of the rib.

The side portion (3 of the cover extends a substantial distance up the side all of the flue, covering the hollow of the expansible stiffening rib, and the upper portions of the sides 6 terminate in extensions 9, which fit into the hollow of the stiffening rib and prevent foreign matter from dropping through the side ribs to the bottom p01 )1] of the rib.

In Figure 5 the cover is made up of three sections, the horizontal bottom section 10, and the two side sections 11. In this instance the two side sections partly overlap the bottom section as shown at 12, and the upper ends of the side sections also terminate in extensions 13, which are V-shaped, like the extension 9, so as to fit into the hollows of the side portions of the rib.

Obviously it may be noted that this cover or shield acts as a sure preventive of the collection of foreign matter in such types of expansible stiffening ribs of the accordion type, and fines so equipped are Very durable, particularly since there is added re-inforcen'ient to the walls of the flue, additionally preventing collapse, due to the provision of the covers or shields.

It is the further purpose of this invention to use these coverplates on all constructions of fines, forced draft ducts, preheater ducts, etc. Furthermore these cover plates act to prevent air eddies existing in the hollows of the stiffening ribs as well as preventing aceun'inlation of soot and other foreign matter. Furthermore, the cover plates or shields are adapted for all types of expansion and extensible joints or stiffening ribs, it being understood that wherever the cover plates or shields are to be used, they may be positioned over the bottom of the lower portion of the sides of the stiffening ribs as in Figures 1 to (3, or may be positioned to cover the entire hollow of the stiffening rib or expansible joint or over any part of it.

The invention having been set forth, what is claimed is:

1. In a device for the purpose indicated, the combination with a fine having expansible stiffening ribs formed in the wall and extending around the transverse area of the flue, of covers over the hollow of the bottom part of the ribs and fastened just beyond its sides first approached by the products of combustion, thereby preventing particles from the products of con'lbustion from collecting in the hollows of the ribs, the opposite portion of the covers being free and unattached and covers for the expansible stiffening ribs formed on the sides of the flue, the latter covers extending a substantial distance upwardly along the sides the flue, the upper ends of the side covers having extensions fitting in and conforming to the shape along the ribs.

2. The combination with a flue for products of combustion, said flue being rectangular in cross sectional area and provided with an expansible stiffening rib of accordion type conforming to the cross sectional area of the flue, of a cover fastened to the inner surface of the wall of the flue on the side of the rib first approached by the products of combustion passing through the flue, said cover having its opposite portion free and unattached permitting full expansion of the rib, said cover acting as a. shield to prevent soot and the like collecting in the stifi'ening rib, said cover extending upwardly adjacent the perpendicular side walls of the flue and terminating in extensions fitting within the rib, further preventing particles of the products of combustion from collecting in the hollow of the rib.

3. In a device for the purpose indicated the combination with a flue having an expansible rib formed in the wall and extending around the transverse area of the flue, of a cover over the hollow of the bottom part of the rib and fastened just beyond its side first approached by the products of combustion, thereby preventing particles there from collecting in the hollows of the ribs, the opposite portion of the cover being free and unattached; means at the ends of the cover eX- tending up at the sides of the flue and cover ing portions of the uprigl'it side parts of the rib and fitting within the hollow of the rib and conforming to the shape thereof to additionally prevent particles of the products of combustion from entering the rib.

4. A cover for an expansible stiffening rib of the accordion type, comprising a cover plate fastened at a point beyond one side of the rib first approached by products of combustion passing through a flue, the opposite portion of the plate being free and unattached, means at the end of the said cover plate and overlying the hollow of the upright sides of the rib, and comprising devices at the ends of said means fitting within the sides of the ribs.

In witness whereof the inventors signature is hereunto affixed.

an lVILLIAM MILLS CONN ERY.

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