US2597033A

US2597033A - Rotary oil burner

Info

Publication number: US2597033A
Application number: US132687A
Authority: US
Inventors: William R Ray
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-12-13
Filing date: 1949-12-13
Publication date: 1952-05-20
Anticipated expiration: 1969-05-20

Description

W. R. RAY

ROTARY OIL BURNER Filed DSG. l5, 1949 May '20, 1952 .,Y n. .WA m2 @m n o l 3@ n.. Nw um, m r TT w w bm QN G w Nm NN I s NN m WN MN u@ QN "Q NN um mw NMA vm K ww km. NW.. M www n ORM Q o N w N o e o h o. civ @uw R3@ www Wb mm. mm,

Patented May 20, 1952 ur-.Nslrioff Es:

PAT-EN orrrce 2,597,033; Ro'rAItY, OIL BURNER-Y. William R'; Ray-,Los AngelesyCalif.) Apiisfiqnmjmbfls, lena-serial 1\10..132,'68`1=V zeciaims. (Cl. 15in-"513)` 24*1941- theglaifer application-haring issued. onv 5 i'protruding', :omits mouth; are Whr'ebr. Substantially iiiplete' co" bis 1Q of' theoiiisfeffected ,within .thebo'wle Qfiiiirofthelpfesentinvention, is i0 piO- 15' jecrtinsgit by Cntrifrgaifor fxohithel rimffihe cup4 toWard' -the side Wall or thejb'owl'tov produce thet'combustible, mixture; I`N hayey found that; slight eocentricty of the side Wallv of 'thecup,'o`r

to provide .means whereby' substantially uniform` 35 of such- 'eecentricity of thel parts" asn'rjayjrsiilt in'mrmalrmaniifaiure-' Y Another object ,of theV invention 'isv to,` prot/,ide

improved means for' supplying air to 'the interior 40 offthe 'bo'wl,'-inv addition' tov air lsupplied!alongA with the oil by war of; the. 'mouthbf the, 011-;- projec'ztingV clip, for' irrlprcwng`cc rnbi.1f.s tilorir Within the bowl.

Antherfobject'is to provideian iniprcnfedsys- 45v tem Aforforcing airto thgburner; jtnisrobject being accomplishedby the provision of '-25 blWe'r means .fonbypassing or venting' the excess' airA 50- tothe atmosphere; the arrangement lbeing such tr1ata11l or the air drawn intol thebloweepasses Y mij-cooling l relation toiy the motor' eniployedA `for;L roagmgtrie Yburner;st'rumore ang the: lofivim'e.r.'v

Frffifu understanding 'or they imreintisri,l aria- 55 me issuing*- fror'n theburnerwheii 20 further appreciation' 01111;;objectsand advanjf tages, reference ',isi toghe; had; to thegfollo'wing de: tailed description and.; accompanying; drawing! In the drawing: n

Figure 1.a is a sectional k*View of an* oil-'burner system, embodying; this invention: and:

Eigre 2i1is A. @n enlargedjsectiorial "View taken?? which denes internallyl a-y combustion-v chamber Walled," withV an air space `between the'-Walls;and consists of fan "inner bowl 'I2 havngyarounw its outside 4a larger bow1 1I3)W`hos'e rim Vportion-is inwardlyf'turned and scnred to `\the'innerlboxn'zlf as` byr Welding:- Atithetop of fthe*structure Y I I ,I

and 'secured --thereto, is VaH funnel-shaped' section I 4 which Vconsltitntesa V'con-strictiorrof the inner bottom -Wall of therouter bowl I3, with afst'ilenv ingjdisk I6#thme'reb,eli-vileerr;l the fratrie consisting 0f a; pair o`fg`-anged-plates 7H? Lvflriich are 'connected to'getherinspaced relationbya;pluralityl` ofri-VetedpinfsIB. Th'ebottom plate'of-fth'e frame isporinected bya" threaded-mating I9 Eto' the -slraftA 201of'an`electricmotor 2'I-; the-male part-of the A its-bottoni endby] the' flange :ofiy the 'dskf isla thin-Walled hollow cylinder 24 whose upper portion extends through central openings@ inl-the minatesadjacentftheplane offthel funnel-section f I4. Rotatinmf .the :cylinder2liv relative' to` itsV supportingvdsk s23-:s` prevented! by- ;a Apin: 25' se Y cured to vthe .diskfandfcooperatingiwith a notch' in thexcylinderl 'The lpor'tion-ofl cylinder2d'be-v tweenithe frame-plates I 'IY 'is'l f-apertured. '(for a purpose y.to y be .destzribed)f so' that `only narrowu center is.; a buttonjZS-lifor-gripping-'When `the* cylinder --is removed or -replacedgbyr raising Y. ori

lowering. y

Supported byy the cylinc'nlerlfZB i's La; circular ine.

verted 'curi-likeV s'trlic'stu'r;v generally indicated 'at 30, whose top wall 3| has an opening through which the cylinder-button 28 freely protrudes. The open end of the cup 30 is flared as indicated at 32, and an intermediate circular portion 33 of the side wall of the cup is reduced in diameter so that it has a snug t with the cylinder. The cup can be removed by lifting it from the cylinder, and means (conventional, but not shown) are provided for preventing relative rotation of these parts. Likewise, the cylinder 24 can be rej,

moved by merely lifting it from the supporting disk 23. Welded to the outside of the cup is a skirt 34 which forms an annular duct around the cup, the duct being in communication with the interior of cylinder 24 by way of a plurality of openings 35 and 36 in the side wall of the cylinder and of the cup, respectively.

The side wall of the cup 30 is formed to provide (immediately below its reduced portion 33) a plurality of lateral recesses 31, the recesses as illustrated being four in number and separated by four narrow longitudinal ribs 38 (see Fig. 2). The recess-defining inner surfaces of the cup taper inwardly in a downward direction so that the recesses 31 become progressively shallcwer toward the open end of the cup.

Pressed in the hollow of the motor shaft 20 is a tube 43, closed at its top and having adjacent thereto four radial openings in which short tubes or jets 4| are pressed. Around the tube 40, and ,j

threaded on the motor shaft, is a hollow cylindrical member 42 'which is closed at its top and has radial'openings (in register with the jets 4|) in which tubular members or long jets 43 are fixed; the ends of the short jets 4| being spaced from the cylindrical member 42. The openings in member 42 for the tubular members 43 are enlarged at their inner ends to form cavities 44 (Fig. 2) separate from each other. Through the wall of cylinder 24 are four elongated openings 45; this cylinder and the cup 30 being so oriented that the centers of the openings 45 and of the upper parts of the cup-recesses 31 are aligned with the long jets 43, which likewise are aligned with the short jets 4| and the radial openings of tube 40.

VThe rotary structure described above is supported solely by the shaft 2U of the electric motor 2|, which is provided with a thrust bearing (not shown) suitable for the purpose. The motor 2| is mounted in one end of an elongated sheetmetal air-duct, generally indicated at 53, which is rectangular in cross-section and comprises a top wall 5|, a bottom wall 52, and an intermediate wall 53 which divides the air-duct into an upper section 54 and a lower section 55. The burner structure is mounted in a furnace jacket 56 with one end of the air-duct 50 extending exteriorly thereof.

The electric motor 2| is encased in a jacket 51 and is secured to the bottom wall 52 of the airduct, with the bottom wall of jacket 51 therebetween, by means of a threaded tting comprising a cap 58. The space between the motor and jacket 51 is lled with lubricating oil by way of a pipe 59, connected to the jacket and extending through the lower section of the air-duct, having a lling-cup 5G whereby the level of the oil (indicated by the lines 3|) can be determined. Connected to the cap 58 is a pipe52 which, it is to be assumed, leads to a source of fuel-oil whose pressure is such as to effect rise of the oil in tube 4l) (by way of the bore or hollow 63 in the motor shaft) to a level slightly above the jets 4|, 43; there being, of course, conventional valve means 4 (not shown) in pipe 52 for controlling the rate of flow of fuel-oil.

Spaced around the upper part of motor 2| and its jacket 51 is a cylindrical duct 54 which is secured by its bottom to the dividing wall 53 of the air-duct and extends through an opening in the top wall 5| of the same into communication with the inlet or mouth 55 of blower 22. Around the blower is a circular casing 66 which is secured by its bottom wall 51, apertured to receive duct 54; to the top of the air-duct. The top wall SB of the blower casing is closely adjacent the bottom of the burner structure and has a clearance opening for the top frame-plate |1. Above the blower 22 is a plate 69, having a clearance opening for the lower frame-plate, which divides the casing 55 into an upper compartment 10 and a lower compartment 1|.

vAround the rotary structure l, and supported by a plate 12 and layer of insulating material 13 fastened to the top of the blower casing, is a stationary structure which comprises three Vcircular sheet-metal members. The inner one of these members is'narrowly spaced from the burner and consists of a short lower section 14 and an upper section 15 which extends slightly more than one-half the height of the burner. The middle circular member 15 is more widely spaced from the burner and rises well above it, and the outer member 11 vforms the usualV furnace structure. Mounted on the member 15 adjacentV the rotary structure is a channeled casting 18 having a depression in its end wall for a ceramic member 19 which serves as a mount for an electric igniter element of the glow type, which conveniently may be the 60G-watt resistance coil commonly employed in domestic heating appliances.

Mounted in a housing 8| on the outer end of the air-duct 50 is an electric motor 82 having a crank and lever 83 connected to a hinged damper S4 which is cooperable with an opening 85 in the top wall of the air-duct; the motor having internal reduction gearing for slow operation of the damper and being so controllable as to effect alternate opening and closing of the same. A vent opening for the housing is indicated at 86. Through the back wall of the upper section 54 of the air-duct is another vent opening 81 whose flow capacity can be regulated by a slidable plate 88.

When the motor 2| is in operation, air is drawn by the blower 22 through an opening 89 at the outer end of the lower air-duct section 55. and openings 9U in the intermediate wall 53; all of the air before entering the blower-inlet 65 having to pass around the motor jacket 51 by Way of the cylindrical duct 64. The air paths are indicated by arrows, and it is to be observed that while the arrows are shown only at the right side Aof the rotary structure to avoid crowding of the drawing, the flow is actually on all sides; the reference characters indicating the air-now openings 90, and-other such openings now to be described, being only at the left.

The air discharged by the blower can leave the compartment 1| by two paths: (1) into the upper compartment 15 through openings 9| in plate G9, and (2) downwardly into the upper airduct section 54 through openings 92 in the abutting walls of the blower-casing and the air-duct.

From the compartment 1i)v there are three upward paths for the air: (l) between the frameplates |1 to the interior of cylinder 24 through the apertures in the lower part of the same, (2) through openingsSS- in plate I6 and the Vbottom-wall ofithe router-bowl I3' 4into the space '-belV tween thel'sameand the inner bowl lf2, and (3) through openings 94 in the blower-casing.A topy wail-B8rv into the annular space between the rotary structure and the inner circular members 14H15.

From the interior of cylinder 24 the air passes into-thecombustion chamber by'two :paths: (1-)4 through the openings 45 and downwardly between the cylinder and .the side wall of cup 3i),V and (2) through the openings 35 and 36 down.- wardly through the annular duct defined by skirt-34. Y

FromtheY-space between the inner and outer bowlsl2, lI3 the air (supplied thereto'by wayf oi"` openings 93)- has three' paths: (1) into the combustion chamber |00 through the openings- 95j in. theVt inner bowl* adjacent cylinder 24; this air-being deflected. laterally 'by a plate 9S :between thelopenings'95 and the open .end or rim. 3-2 of cup andv secured to the bottom. wall of thebow'l-ifby'small-spacers` 91 so as tominimizeconductionlo-fA `heat .between .these parts, (2) into the combustion chamber adjacent its top by way of a circumferential row of openings 93, and (3) to the space loutside the rotary structure 'by Way of a row. of openings '99 Ain the outer bowl .and in the same plane as the openings 93. The openings g8 and 99 lare conveniently ofthe samesize but the openings 98 are -then more numerous,l there vbeing-,in a practical embodiment vof the invention 45 .ofthe openingsg and only 6 of the openings 99;

The blower 22 is of such construction that its air-impelling capacity is in excess :of the requirements ofithe-oil-burner under all conditions, so that 'part of the air passing from the blower to compartment 'H is vented to atmosphere Lby way 0f the openings 92, upper air-duct section 5t, opening 8l, and openings 85 Aand 86 -when damper 84 is open. vBy `this arrangement all of the air drawn finto the blower, by way of the lower airduct -section 55 and the cylindrical duct 6d, Vis eiective forcooling the electric motor 2|.

In-operation, the burner structure I! is rotate-dat high speed by the motor (conveniently,r 1550-33,. P. M. when the diameter of structure l! is about six` inches) so that fuel-oil supplied to the-short jets'dfl (by way of pipe @2, bore 63 of the motor shaft and tube 40) is projected by centrifugal force from these jets into the cavities 44n (Fig. 2) and long jets 43, whence it is projected `byrcentrifugal force into the recesses Si' oilcup :30. The Iair entering the cup ASt through openings-45 mixes Ywith ,the oil inthe recesses-and carries it to the rim 32 of the cup from vwhichthe mixture is projectedv by centrifugal force toward .the side wall I5 `of the inner bowl l2 in theform Aof a spray which, when ignited by mea-ns'hereinafter to be described, burns within the combustion chamberV |09 .to produce a rotating fire therein -and at the top or open end of the--chamber.

One important feature of this invention residesv in the arrangement whereby the fuel is projected from the lrim of the cup 3) substantially-.uniformly inall directions toward lthe sides of the combustion chamber despite such eccentricityof the parts as may result in normal Irlaimlfacture.v

This arrangement ldepends primarily on the small diameter of tube 49 and the shortness of the inner jets .4I which form-radial outlets for theoilPirom'.that-tube; In an actual embodiment of-` zthe-invention, substantially identical with 6 Y that shown inthe drawing.: the radi-usoif the" jet`s`^4l is'approximatelyg inch; the dimensionsof the parts as shown in 2 being-'only'slightlyl less than those in thel actual embodiment (th'ev' scale'of Fig. y1 'being 1:2.25)-. Due-to the'shorlte nessofl the jets-4I -the'rotary'velocity of thefoil'- particlesat the outlets of these'jets is low, and-l thetcentrifugal forcef acting on' them isfc'orre ati-vely. long', thecentrifugal force (which -ispro-z portio'nal lto the squarev ofv the velocity) would be'greatenough -to cause most of the oilf-toebel` projected4r from 4onlyv one-.vor twoof thefourjets' in-the :event ythat :the suppl-y tube- 46 andthe jets 4l were not exactly"concentric;-the .eiect being I similar 'to' that produced' in connection `lvtfithfan unbalanced gywheel.

The' oil projected, lthrough space, -from-thefrv inner jets .4l is .collected by the-respective'cavities 44- (Fig. 2) so that -itpasses into `the associated* long-'jets 4:3 and-is projected -therefromthroughthe-openings d5 in cylinderv 24, into the individual ,adjacent recesses 3l in the inner fside surf-aceof cup 39. Inasmuch as .the'oilr is thus supplied-atequal rate to each of these recesses, the lateralprojection .of the .Oil (or .oil-.air mixture) from the rim iofthe cup 'ishence substantially' uniform inall directions.

The reservoirs formed yby the deepening ofy the' recesses 31 at their upper ends Contribute lto-th'ef proper admixture of the oil-With the air entering..- through theopenings 45 adjacent :the reservoirs .in addition .to that .entering-,the combus-A tion chamber i by .way of the' open end .o'f `cup 30,- -is supplied to the chamber by three other paths-z (l) ldownwardly through the annular'duct formed'by skirt 3i, (2) .through the openings-95 inthe vbottom or" the innerbowL-and (-3-) through the openings 93 in the side wall of the inner bowlr adjacent-the upper end ofthe chamber.

The air flowing downwardly through .the annular duct (path 1) impr'owesicombustion-byzpene trating to the interior' of the nre. The air passy ing. through the openings .95v (path 2) -is-heatedf by contact with the deiiectingplate 96- which,l after the burner is in kfull operationfbecome's-re'd hotdue to -its exposure to Ithe 4fireinthe-chamberand to the fact that it is vso mounted 'as `to minimize 'loss offbeat oy conduction, so thatthis'airf inthe.chamber; the' temperature'of this air being*- raised'to a high degree :by heat received from-the side wall i5, which heat otherwise-wouldbelost" to the .exterior of the rotary structure, so that thev double-Wall arrangement of the structure serves as a very eective thermal insulator.

It will be .observed that some ofthe lair-passi. ing'between the doublelwalls can esca-'pe't'othev exterior of the rotary structure by way of the openings 9E]` (whose function isY-to'be described), but, as was previouslymentioned, there are rela'- tively few of these openings.

and the annular duct formed Iby the' circular members 'M -15 this air passing upwardly around the outside of the rotary burner andservinLgasa ,forced-supplyfof-secondary-air.-

Still another pathfor air from -the Iblower is'by' way of openings 9'4 7 sides in means for starting the fire in the burner, which means will now be described: With the structure rotating at normal speed, fuel-oil is1 permitted to flow through pipe 62 so that it 1S discharged from the mouth of cup 30 in the` form of a spray of liquid cil which upon reaching the side wall l5 ascends the same, the wall being tapered slightly outwardly, as shown, to facilitate the ascent of the oil. Upon reaching the openings 98 the oil is projected therethrough, the centrifugal force acting on the oil being so great that its outward passage is impeded only slightly by the air entering the chamber through these openings. The oil then in the space between the double Walls of the structure is projected there.

from by centrifugal force through the openings 99 into the outside space defined by the circular member l5 and wherein the igniter element 8D is located. It is to be assumed that the igniter had already been brought to glow temperature, under the control of manual or automatic means, so that the oil is quickly ignited. The re thereby produced outside the rotary structure is effective, after a period of about seconds, to initiate combustion within the structure by igniting vapors rising from the open end of the same.

When the fire within the rotary structure is well established (in 1-2 minutes) the production of re in the outside igniting-space ceases due to the fact that the oil mixture projected from the mouth of the cup 36 is then in a burning condition well before any of it can reach the side wall of the structure, so that obviously none of it can pass through the side-wall openings S18- 99. There is very little deterioration of the igniter element in use, since it is out of the path of ame issuing from the interior of the burner structure and is subjected only for brief periods to the outside flame, the temperature of which is relatively low. The electric igniter is not essential, since the igniting ame can be started in the outside space by other means, for example, simply by a piece of burning paper.

In high-fire operation of the burner, the oil is supplied at high rate and the damper 84 is closed so that all of the air from the blower, other than that vented to atmosphere through the adjustable opening 81, passes to the burner. To produce a still-higher nre, the opening 8l is fully or morenearly closed and the rate of supply of oil increased proportionately. After the re has been burning for about ve minutes and all of the parts have reached high temperature, if it is desired to produce a low-nre condition the supply of oil can be throttled down to a rate about onesixth that required for high-fire, and the supply of air correspondingly reduced by opening damper 84 (to the position shown in the drawing) so as to vent to atmosphere more of the air discharged by the blower.

The features disclosed and claimed in the aforementioned copending applications Ser. No. 679,285 and Ser. No. 787,648, now Patent No'. 2,568,763, September 25, 1951 include the means for impeding passage of the burning gases from the rotating combustion chamber, which means is constituted by the annular constriction I4 of the side wall I5 of the structure shown in the present drawing; as well as the inverted arrangement of the spray cup 30. The present improvements over my previous arrangements reside mainly in: (l) the means for starting the re, (2) the means for eiecting uniform distribution of fuel in the combustion chamber despite such eccentricty of the parts as may occur in manufacture, (3) the means for introducing additional air to the chamber to improve or;comp1ete the f combustion therein, and (4) the arrangement for circulating all of the air drawn into the blower in cooling relation to the electric motor The specic embodiment of my invention herein shown and described is obviously suscepti-e ble of modication without departing from the ,Y spirit of the invention, and I intend therefore to be limited only by the scope of the appende claims.

I claim as my invention:

l. A rotary oil-burner, comprising: a hollow structure dening internally a combustion chamber, said structure having an end walland a side wall generally-circular in cross-section, the 'struc-i ture being open at its end opposite the end wall; means for supplying fuel-oil to said chamber and air for combustion of the oil within the 4chamber; a motor for rotating said structure about the axis of its side wall at a speed such as to rotate the fire produced in the chamber by said combustion; there being an opening through said side wall of the structure, said opening being small relative to theopening dened by said open end of the structure; and means dening around the outside of said side wall a'space where vaporized oil, passing thereinto through said side-wall opening when the structure is rotated, can be ignited to initiate said combustion'.

2. A rotary oil-burner, comprising: a hollow structure defining internally a combustion chamber, said structure having an end wall and a side wall generally-circular in cross-section, the structure being open at its end opposite the end wall; means for supplying fuel-oil to said chamber and air for combustion of the oil within the chamber; a motor for rotating said structure about the axis of its side Wall at a speed such as to rotate the lire produced in the chamber by said combustion; there being an opening through said side wall of the structure, said opening being small relative to the opening defined by said open end of the structure; and means for initiating said combustion, comprising an igniter element mounted outside said structure for igniting vaporized oil passing through said sidewall opening when the structure is rotated, said igniter element being out of the path of flame issuing from said open end of the structure when said combustion is established.

3. A rotary oil-burner, comprising: a hollow structure deiining internally a combustion chamber, said structure having an endwall and a 'side wall generally-circular in cross-section, the structure being open at its end opposite the end wall;

means for supplying fuel-oil to said chamber comprising a member within theV chamber adapted to discharge the oil toward said side wall of the structure; means for supplying air to the chamber for combustion of the oil therein; a motor for rotating said structure about the axis of its side wall at a speed such as to'rotate the iire produced in the chamber by said combustion;

4. A rotary oil-burner as defined inclaim 3,A4

iingbeing smal1 relative to the opening defined Vby said open end of the structure; and means for andwherein said constriction isiormedbyan inwardly inclined portiono'fsaid side wall adjacent :fthetopen end of the structure.

`5'.`A rotary oil-burneras de'ned in claim 3,

sandvvherein the portiono'f said side wall' adjacent. said end wall of'thestructure inclines outfwardly vin a direction toward said constriction.

6. A rotary oil-burner, comprising: a hollow `wall; means .for supplying fuel-oil to said cham- :berfcomprising a member within the chamber adapted to discharge the .oil toward said side wall vvof the structure; means for supplying air to the .chamber for combustion of the oil therein; a .motor for rotating said structure about the axis ofgits side Wall at a speed such as to rotate the nreproduced inthe chamber by said combustion;v saidside wall of the structure having an annular yconstriction, and there being an opening through "said v:side .wall at the side of said constriction toward said end wall of the structure, said openinitiating said. combustion, comprising an igniter element stationarily `mounted outside said structure for igniting oil vpassing through said sidewall `opening when the structure is rotated, said .igniter element being out of the path or" ame .issuingfrom said open end ofthe structure when said combustion is established.

7. A rotary oil-burner as dened in claim 6, and wherein said constriction is formed `by an 8. A rotary oil-burner as dened in claim 6,

and .wherein the portion of said side wall adja- A cent said end Wall of the structure inclines outwardly in a direction toward said constriction.

9. A -rotary oil-burner, comprising: a hollow structure dening internally a combustion chamber, said structure having an end wall and a side Wall generally-circular in cross-section, the structure being open at its end opposite the end wall; means for supplying fuel-oil to said chamber; a memberwithin the chamber for receiving and discharging said oil, said member being carried by said structure and arranged in coaxial andv spaced relation to said side wall, the member having a discharge rim in a plane adjacent said end wall of the structure; means for supplying tothe chamberair for combustion of said oil; a

-motor-for rotating Ysaidstructure about the axis" of its side wall at a speed such that the oil is projected by centrifugal force from said rim toward said side wall and is thereby atomized, so that it burns within the chamber when ignited; said side wall of the structure having an annular constriction, and there being an opening through said side wall at the side of said constriction toward said end wall of the structure, said opening being small relative to the opening dened by said open end of the structure; stationary means deiining around the outside of said side wall a space for receiving atomized oil passing thereinto through said side-wall opening when the structure is rotated; and an igniter element mounted in said space for igniting the oil therein to initiate said combustion, said igniter element being out of the path of ame issuing from said open end of the structure when said combustion is established.

l0. A rotary oil-burner as deiined in claim 9,

`and wherein'the portion of saidside WaIladjacent .said end wall `of the structure inclinesoutkrim is in a plane between the planes of said end wall and said open end of thestructure; the inner surface of the side wallof-'saidv cup vbeing formed to provide a plurality of 'recesses therearound; means for supplying fuel-oil to said cup comprising means carried by the structure for supplying the oil lto the individual ones of said recesses; and a motor for rotating the-'structure about' the axis of its sidewall at a speed such that the oil supplied to said recesses is projected by centrifugal force from the rim of thecup toward the side Wall of the structure.

l2.Y A rotary oil-burner as defined in claimll, and whereinvsaid cup is positioned so -thatits open end faces said end Wall of the structure.

'113. A rotary oil-burner as dened in claim 1l, and wherein said means for supplying the oil to said recesses comprises means arranged coaxially within the cup and in spaced relation to thefside wail thereof.

' 14. A rotary oil-burner, compriisng: ahollo structure dening internally a combustion chamber, said structure having an end wallr and a side -wall generally-circular -in cross-section, thestructure being-open at its 'end Yopposite the end wall; a cupcarried by thestructure within said chamber, said cup being arranged in coaxial and spaced relation to said side wall' andfso that itsrim isv in a plane betweenthe-planes of `said end wall and said openA end of the structure;

'tion to the -sideV wall thereof, said supply tube having a plurality of radial openings directed respectively in the directions' ofsaid recesses; and amotor for rotating the vstructure about the axis of its side wall at a speed such` that'theoil isprojected by centrifugal force from said supplytube openings into the individual "ones of said recesses and passes therefrom Varound the rim of the cup toward the side wallof the structure.

l5. A rotary oil-burner as dened in claim 14, and wherein said cup is so positioned that its open end faces said end Wall of the structure.

16. A rotary oil-burner as dened in claim 14, and wherein the parts of said recesses at their ends away from the rim of the cup are of increased capacity, and said supply-tube openings are directed toward said parts.

17. A rotary oil-burner as defined in claim 14, and including a plurality of radial tubular members carried by the structure and interposed between each of said supply-tube openings and the respective ones of said recesses, said tubular members being spaced from said supply tube and said cup side-wall and adapted to facilitate transfer of the oil from the supply tube to the recesses.

18. A rotary oil-burner as defined in claim 14,

and including a hollow cylindrical member carried by the structure and encircling said oil-supply tube, said cylindrical member being spaced from the supply tube and the side wall of the cup and having cavities in its inner surface registering with said supply-tube openings, and a plurality of tubular members each communicating with one of said cavities and projecting radially from the cylindrical member toward the individual ones of said cup-Wall recesses. 19. A rotary oil-burner, comprising: a hollow structure dening internally a combustion chamber, said structure having an end wall and a side wall generally-circular in cross-section, the structure being open at its end opposite the end wall; l5 means for supplying fuel-oil to said chamber and air for combustion of the oil within the chamber;

a motor -for rotating said structure about the axis of its side wall at a speed such as to rotate the re produced in the chamber by said combustion; and means for supplying auxiliary air to said chamber comprising means forming with said side wall of the structure an annular space therearound and constituting the side wall of a double wall, there being openings through the 42&5 inner one of the side walls adjacent the open end of the structure, and means for forcing air intothe chamber through said space and said openings.

- 20. A rotary oil burner as clened in claim 19, andincluding means for directing said fuel-oil into the chamber adjacent the end Wall of the structure.

21. A rotary oil-burner as defined in claim 19, and including means forming an annular con? striction of said side wall between said auxiliaryair openings and the open end of the structure.

22. A rotary oil-burner, comprising: a hollow structure defining internally a combustion chamber, said structure having an end wall and a side" 4 wall generally-circular in cross-section, the structure being open at its end opposite the end wall; a cup carried by the structure within said chamber, said cup being arranged in coaxial and spaced relation to said side wall and so that its open end1h45 faces the end wall of the structure and is adjacent the same; means for supplying fuel-oil and air to the interior of said cup; a motor for rotating the structure about the axis of is side wall at a speed such that said oil is projected by cen-fA 5,0 trifugal force from the open end of said cup toward the side wall of the structure and is thereby atomized so that it produces a rotating fire Within the chamber when ignited; and means for supplying additional air to said' re comprising 55 means on the outside of the cup for directing air, passing from the interior of the cup through an l2 opening therein, in the general direction of the end wall of the structure.

23. A rotary oil-burner as dened in claim 22, and wherein said means for directing said additional air in the general direction of the end wall off the structure comprises means forming an annular duct around the side wall of said cup and secured thereto.

24. A rotary oil-burner.' comprising: a hollow structure dening internally a combustion chamber, said structure having an end Wall and a side wall generally-circular in cross-section, the structure being open at its end opposite the end wall; a cup carried by the'structure YWithin said chamber, said cup being arranged in coaxial and spaced relation to said side wall and so that its open end faces the end wall of the structure and is adjacent the same; means for supplying fuel-oil and air to the interior of said cup; a motor for rotating the structure about the axis of its side wall at a speed such that said oil is projected -by centrifugal force from the open end of said cup toward the side Wall of the structure and is thereby atomized so that it produces a rotating re within the chamber when ignited; and means for supplyingadditional air to said re through an opening provided in the end wall of the structure, said last-named means including a plate secured to the end Wall of the structure in parallel spaced relation thereto, said plate being spacedly interposed between the open end of said cup and said end-Wall opening, the rim of said plate being spaced from the side wall of the structure.

25. A rotary oil-burner as defined in claim 24, and wherein said plate is so mounted on said structure as to minimize conduction of heat therebetween.

WILLIAM R.. RAY.

REFERENCES ,CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,505,746 Stromquist Aug. 19, 1924 1,640,081 Johanson Aug. 23, 1927 1,643,436 Allerdice Sept. 27, 1927 1,722,504 Morris July 30, 1929 1,871,952 Chadwick et al. Aug. 16, 1932 2,200,278 Johnston May 14, 1940 2,202,822 Behrens June 4, 1940 2,251,055 Howard et a1 July 29, 1941 2,355,897 Wyld Aug. 15, 1944 2,507,006 Hammel et al May 9, 1950