US2457423A - Furnace stoker - Google Patents

Description

Dec. 28, 1948. O; wHlTE V 2,457,423

FURNACE STOKER Filed July 11, 1945 2 Sheets-Sheet l IN VEN TOR.

f g ah/mze Maw E. 0. WHITE FURNACE STOKER Dec. 28, 1948.

Filed July 11, 1945 2 Sheets-Sheet 2 Patented Dec. 28, 1948 UNITED STATES PATENT OFFICE) 2 Claims.

This present invention relates to improvements in stoker fired furnaces and involves a construction fitting the stoker to the furnace and vice versa.

Automatic coal burning stokers were originally Earlier installations necessarily made from the front left the stoker very much in the way and made the removal of the clinkers inconvenient. To overcome these disadvantages many of the present furnaces equipped for stoker firing have a side entrance for the stoker. Aside from this the conventional ash pit construction has been followed and a practical arrangement for making the installation from either side is lacking. The importance of such an arrangement appears from the fact that the condition of the basement often makes it necessary to make the installation from one particular side.

Furthermore the usual method of installation is inconvenient and costly and tends to shorten the life of the retort. Many installations are made by filling in sand around the retort and laying a refractory hearth on top of the sand. The sand collects moisture during the summer season which results in the rusting out of the retort and wind box. A further shortcoming is found in the inefficient construction of the hearth and its support. Both often give way and expose the lower part of the retort and wind box to excessive heat causing them to burn out. In an effort to overcome this a ventilated installation has been developed which, however, still clings to the antiquated ash pit construction. The only change in this last installation is the substitution of a plate for the sand as a support for the refractory hearth, the ash pit itself being open to the air instead of being filled with sand.

The present invention starts with the conception that the furnace and stoker represent a unit in which one must be fitted to the other. In order to fit the furnace to the stoker, it is necessary to support the furnace above the ground by legs, thereby eliminating the ash pit entirely. The closed bottom of the furnace has only an opening for the retort, the opening being reinforced by a stiffening ring. The shape of the transverse cross section of the retort is immaterial. The stifiening ring fits into a groove lined with asbestos rope or furnace cement and both make an air tight seal for the bolted joint between retort and furnace. The fastenings are so located that the windbox is reversible and can be turned to right and left (Figure l.)

The outer end of the windbox is connected to the casing in a manner giving it a finished appearance.

The construction hereinbefore outlined has several advantages one of which is a quick and easy cost saving installation; another advantage arises from the device of the installer between the two sides of the furnace through which the windbox extends. A third advantage lies in the longer life of the windbox and retort. A fourth advantage is the finished appearance of the casing and outer end of the windbox connected thereto.

Other objects and advantages of my improved furnace will be obvious to persons skilled in this art after the construction and operation is understood from the following detailed description read in connection with the accompanying drawings in which:

Figure 1 is a vertical section of the preferred embodiment of my invention;

Figure 2 is an enlarged vertical section on line 2-2 of Figure 1;

Figure 3 is a horizontal section;

Figure 4 is a front end view and section on line 44 of Figure 3;

Figure 5 is a vertical transverse section through the windbox.

In the drawings in which like characters of reference designate corresponding parts throughout the several views, numeral 2 denotes the conventional casing within which the furnace 3 is supported on legs 4. The lower portion of the furnace forms a combustion chamber the cylindrical wall of which is lined with fire brick 5. The bottom 6 of the furnace is slightly dished and has a central aperture surrounded by a cylindrical flange 1 which extends above and below the bottom.

A windbox 8 has a transverse'oblong vertical section (Figures 2, 5) and an inner semicylindrical end portion concentric with the furnace (Figure 3). Angle irons 9 are attached by welding or otherwise to opposite ends of the fiat vertical sides of the wind-box and have in their horizontal arms bolt openings H) for the lower portions of bolts II and nuts [2 of which bear against the lower surfaces of the arms. The upper ends of the bolts are secured to and in lugs l3 attached or formed upon the lower surface of the furnace bottom. The top of the windbox has in its semi-cylindrical end a circular opening l4 formed within an inwardly extending flange 15. A cylindrical flange [6 extends upwardly at right angles to the first flange and is partly a continuation of the semi-cylindrical wall forming the inner end of the windbox. The flange l6 encloses the downward-1y extending portion of the cylindrical bottom flange I.

The retort l'l consists of an outer cylindrical portion .18 the lower edge of.-which-'.is ;secured by welding or otherwise to the inner marginal portion of the flat inwardly extending flange l5 and defines with the flange i6 an annular space. The bottom of this space is filled WithlfijSbfiSt'US rope or furnace cement l 9 and the annular space also receives the lower portion of 'the bottom flange 1 extending below the unglerside gofyzthe bottom. This construction seals the gases from the space between the furnace and casing.

The annular top surface of the bottom is cov- :=-erednwith fire :briclrs. 20 the inner: ends of. .which .formavith the adjacent outer surfaceofxtheiouter retort portion an annular space,Jfllle'dEJ-with :fur-

nace cement 25 or a-similar substance. .Theioiiter portion of the retort extends above the horizontal top surface of the fire bricks lining thenbottom f the furnace and is provided in its upper rn'argin with a plurality of aradial openingsflwvhich admit-air from the windbox to'thewcombu'stion chamber. The top of the :outer -retort1portinmis formed. by a: flat annular portion2231fr0m :the

inner retortportion 2d,-representing the frustrum of: an inverted cone and. provided atxthenupper end with a series of radial air openings-.25.

..The lowernarrow end of theinnerr-retort section is surrounded by an upwardly extending EflangeZfi on the horizontal mouth.ofiawfeedatube 21 which curves laterally and vdownwardly;.and extends horizontally towards and: through the sidewall of the furnace casing. i

Thewindbox has an outer verticalendwallzfl which is arranged to lie outside of:the:out:er.tside ofthe casing wall: and has an -.aperturerwithi an inwardly extending; cylindrical" flange 29;; lfor-ilthe outwardly extending portion ofmthe feedrz tube.

The windbox is provided on all sides-with anjoutwardly extending flangej 3fi--position=ed :inwa-rdly of the end wall of the windboxand secured by bolts 3| to the casing.

:The' feed tube 2'! extends*-outward1y;.of"3the windbox (Figures 1, 3) and is provided-in .the end :portion adjacent the outer "side of: the:::end

.wallof the Windbox withaapair-of-rradialithnead ed'apertures which receive each-'abo'ltv32. I'The bolts .iZbear with their. inner endsqazagainsttthe .outer sideofan'extension tube 33 which extends into the feedv tube. 3 i

The end vwall of the windbox-hasion eithensid of the feed tube an aperture 34, onenforianair tube 35andthe other for a cleanout; tube 36.

. The above description and ...accompanying drawing (Figure 1) clearly indicate rthatlitheiassembly comprising the retort;windbox;':feedtube file of this patent;

4 can be connected to a furnace through either side wall of the casing. The combustion chamber has a double seal of heat resisting material against the escape of gases.

I have specifically described the preferred embodiment of my invention in all details in order to impart a full, clear and exact understanding of my invention. I do not desire, however, to be understood as confining myself to the precise construction'and relative'arrangem'entiof parts asdisclosed, my inventionbeing defined by my appended claims within the scope of which changes in structure and in arrangement may be made-iwithout departure from my invention. 15. .What I claim and desire to secure by Letters *Pate'ntis: v 1.-A stokerlfed warm air heating plant com prising a furnace having a bottom supported above 'the floor and provided with a flanged opening in the bottom thereof, a retort in the opening 'ihaving :inn'er and 2.0111781 :parts 'joinedaat -;:'their 'upper ends in spaced .relationshipjand each;hav .ing a :seri-esofztuyere apertures, a windbo'x having an opening concentric with said first opening 5 .andza flange .surro'urldingzboth openings .andz'ithe iflange of .fthe 'i'lrst mention-ed opening; heat' resisting sealing-means betweena'the flangeaandithe ;-.w=ind;box, .a' connection between'the windboxliand furnace bottom, fuel feeding means COIlnBCtGdiiljO 1 the: inner part of the i retortiand. extending through the wind-box, an airitube extending-into the windbox, and. a cleaner tube...accessible from the outer side of the furnace. I

2. A; warm "air heating" plant "comprising .eaul'eg supported urnacer'havin-g Z a centrally 1 apertured bottom :and a brick :lined' combustion chamber disposed thereabovepa cylindrical flange. in the aperture, a: retortiin the Iflange an'dzlincluding radially spacedooutervcand' inner partsj'oined iat 4b their upperzend's, said retortparts. being aper- REFERENCES .crrnn The following references' a re of record in the .UNITEDPSTATES (PATENTS Cross et al Oct. 8, l94-6

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