US2329920A - Combustion chamber - Google Patents

Description

Sept 1943- v J. D. 'LOVELEY 2,329,920

COMBUSTION CHAMBER Filed Jan. 16, 1942' 2 Sheets-Sheet 1 IN VEN TOR ATTORNEYS,

Sept. 21, 1943.

J. D. LOVELEY 2,329,920.

COMBUSTION CHAMBER Filed Jan; 16, 1942 2 Sheets-Sheet 2 IN VEN TOR ATTORNEYS.

' placed in spaced relation to Patented Sept. 21, 1943 TA ES rsN-rorrlcs COMBUSTION enamels lJ osep h D. Loveley, Day Y Chrysler Corporation,

v ration of Delaware Ohio, assignor to Detroit; Mich, a corpo- ApplicationsJanuary 16, 1942, serial Not 427,061 L] solaims, (01.158-4) of ceramic and ,s'imilarfimaterial is objectionable since the mass of material is slow to heat or to cool, resulting in overrun temperatures in the space being heated, is bulky {to package and to ship, and is subject to a high percentage of breakage during shipment andinstallation. The use of sheet metal of special alloy characteristics is objectionable since the elements' used in forming heat resistant metals" capable of withstanding hightemperatures Without buckling, scaling, or oxidizing; are very expensive and difficult to ob tain, especially at the present time. p The use of sectional cast iron pots is objectionable because of the relatively high cost and expensive'mounting' required. I Y 7 The principal objectof thejpresent invention is to provide a one-piece castiron firepot so constructed and mounted in'the combustion cham-' ber of a heating appliance as to be the iullequiyalent of a sheet metal firepot of special character; istics, such as 27% chrome steel. I have discovered that by the reason of my mounting arrangement I am able to use ordinary' gray iron or 'similarcast ironof inexpensive typewithout dangerof cracking thejfirepot by reason of 'un equal stresses an'dst rains; By my present invention I am ableto utilize'a cast iron firepot the walls of t 'a come bustion chamber asisrpresent practice in heating appliances using sheet metal firepots. I have discovered that my arrangement permits the use of ordinary cast iron without danger of destruction of the firepot or the mounting thereof by the creation of unequalized strains as was pre- Fig. 1 discloses a heating appliance in which the presentirivention may be used; i

Fig. 2 discloses the combustion chamber of a" heating-appliancelof a'type for'which the present invention: is adapted, i said: combustion chamber being such as disclosed in the patent toiAllen Pi Livar, No. 2,l96,7(l3,issued April 9,1940."

viously thought to be the insurmountable reason for not using cast iron firepots suspended in combustion chambers.

The objects and advantages of the presentinvention will be more readily apparent to those skilled in the art from a study of the following specification taken in connection with the accompanying drawings wherein like numerals refer to like parts throughout.

In the drawings,

Fig, 3 is 'a'front elevational-viewof the coma bustion cliambelwdisclosed in Fig. 2; t .s Fig. 4' is 'avertical' section "taken substantially along linedl or Figf'3 and showing inventioninthepl'a'ce ofuse; and "1:" c a Fig.'5' is a view intpe'rspective of aafirep'otand the mounting means: therefor comprising the present invention." i.

For purposes of illustration'I' have illustrated the'prese'nt invention in a winter air conditioning? furnace although it should be: readilyrf'apparent that "the present inventionmay housed in .other.

heating appliancesgisuch :as boilers, "water heat ers, space heaters; and the like. The furnace comprises a blower lil adapted to force air around the Walls of a combustion chamber I l and attached radiators I2 as disclosed in the.aforesaid patent. The, present invention: is adapted to: be

usedin connection with, burners ofthe type-haw ing a draft tube-l 3,.such as the oilaburner M illustr'ated in Fig; 1. :The combustionchamber com; prises a substantially completeinenclosure except for the-flue outlets liandan opening I15 ofsubstantial sizein a vertical wall thereof; 'the opening being jclosedgbyxamounting plate ll having its edges -1overlapp n and fastened to the'eclges ofthe .opening-li mwv L p 1 The :firepot 26' comprising the present inven-' tion includes a bottommallijgandsubstantially vertical side walls 22, preferably formedin teardrop shape ;with its: largest: diameter away from the pointjofj admission;of the fi lme, and a substantia ly zyerti altfiattywallsfit. adapt d::t be maintained substantially parallel to the mounting plate H. The mounting plate l l is provided with an opening 24 adapted to embrace the draft tube It, and the wall 23 is'provided with a similar opening 25 through Which the end of the draft tube l 3 projects into the firepot.

the presentsficient rigidity and the brackets are so placed as to be protected from oxidizing flames that long life should be achieved therewith. Each of the strips comprises a central portion 36 adapted to be fastened flat against the wall 23 in horizontal position, one above and one below the opening 25. Attachment of the strips to the wall 23 is achieved by bolts 3| at the corners of the wall 23, there being preferabiy a pair of such bolts to each strip and located at widely separated points. The laterally extending ends of the brackets 28 are bent outwardly away from the firepot at 32 to provide supporting arms 33 to hold the firepot spaced outwardly bent ends fastened to from the wall of the combustion chamber, and are reversely bent adjacent their ends to provide parallel portions 34 which may be fastened to the supporting plate H. The size of the firepot is preferably such that the firepot may be mounted upon the mounting plate I! and insertedthrough the opening l6 so sembly is provided.

Preferably the corner edges of the firepot between the walls 22 and 23 and between the bottom and side walls are rounded so as to lessen the chances of unequal ing at these points.

When the present invention'is in use the flame projecting from the end of the draft tube I3 causes more intense heating at the far end of the firepot than at the points surrounding the opening 25. Heating of the wall 23 is achieved rather slowly by a combination of conduction from the far end of the firepot and of radiation from the flame and inside walls of the firepot.

Since this heating takes place rather slowly, time is given for equalizing of strains 50 that the firepot is protected from cracking. Also, the relatively thin gauge strips 30 may buckle or stretch slightly if there is unequal expansion, and due to the relatively thin gauge thereof any unequal expansion between the side of the firepot and the brackets will be taken up in the portions 30 of th brackets.

Likewise, the distance between the bolts 3| may vary without affecting the mounting means silnce the supporting arm portions 33 may change their angular relation to the remainder of the bracket without causing undue strain on the mounting plate l1.

Having described and illustrated a preferred embodiment of my invention, it should be apparent to those skilled in the art that the same permits of various modifications in arrangement and detail. All such modifications as come within the scope of the following claims are considered apart of my invention.

I claim:

1.'A heating appliance comprising a combustion chamber, an oil burner of the draft tube type having a draft tube projecting into said that ready inspection and asstrain causing crackto the walls of said combustion chamber, a cast iron firepot suspended, in said combustion chamber and having an open top, a closed bottom and substantially vertical side walls, a portion of one of said side walls having an opening therethrough through which the end of the draft tube of said oil burner projects, and means to suspend said firepot so that all portions thereof are held in spaced relation fire chamber consisting of a pair of thin gauge sheet metal strips fastened horizontally to said firepot, one above and one below said opening, each of said strips having a wall of said combustion chamber, and said strips being the sole support of said firepot.

' 2. A heating appliance comprising a combustion chamber having a vertical wall provided with fa relatively llargeiopening therethrough, a plate secured to the edges of said large opening and having a smaller opening therethrough, a pair of relatively light sheet metal strips, located one above and; one below saidsmaller opening, fastened to said plate at their ends and having protruding central portions spaced from said wall, a cast iron firepot having a vertical wall fastened to the central portions of said strips and solely supported thereby with all portions thereof spaced from the walls of; said;combustion chamber,-said firepot having an opening through itsside wall maintained in, substantially coaxial alignmentwith the openingthrough said plate, and a fuelburner comprising aldraft tube extending into said firepot through the aligned openings in said plate and said firepot. v i l k 3. Aheatingappliahcecomprising a Combustion chamber having avertical wall provided with a relatively-large opening therethrough, a plate secured to the edges or said large opening and having a smaller 5 opening therethrough, a pair of relatively light sheet metalstrips, located one above and one below, sai'd smaller opening, fastened to said plate at theiren ds and having protruding central portions spaced from said wall, a cast ironlfirepot having-a vertical wall fastened to the central portions of said strips and solely supported thereby with all portions thereof spaced from the walls of said combustion chamber,.said firepothaving an opening through its side wall maintained in substantially coaxial alignment with the opening through said plate, and a fuel burner comprising a draft tub extending into said firepot through the aligned openings in said plate and said firepot, the relatively large opening through said vertical wall of the combustionchamber being of such extent with respect to, the all-overdimensions of said firepot that the firepot-may beremoved from said combustion chamber while attached to said plate. 1

JOSEPH D. LOVELEY

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