US2351421A - Rotary burner for gas and oil - Google Patents

Description

June 13, 1 944. 3, w GIBSON ROTARY BURNER FOR GASES AND bILs Filed April 19, 1941 3 Sheets-Sheet 1 June 13, 1944. c. w. GIBSON ROTARY BURNER FOR GASES AND OILS Filed April 19, 1941 5 Sheets-Sheet 2 10a, Jr??? 2/ 6:

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\ Jam Z6 June 13, 1944. c, w, GIBSON ROTARY BURNER FOR GASES AND OILS Filed April 19, 1941 3 Sheets-Sheet 3 J xi 3 Znvtflfor- Cr/[Gtdzsarz Patented June 13, 1944 um'rso STATES PATENT OFFICE ROTARY BURNER FOR GAS AND OIL Carl W. Gibson, Linden, N. J., assignor to Coppus Engineering Corporation, Worcester, Mass., a corporation oi Massachusetts Application April 19, 1941, Serial No. 389,297

15 Claims. (Cl. 158-11) The present invention relates to a burner of the general type and principle disclosed by Dennis Patent No. 2,177,245, dated October 24, 1939, in which rotary motion, produced by discharge of gaseous fuel under pressure, serves not only for propulsion of combustion-supporting air, but also for effecting an intimate and homogeneous admixture of fuel and air.

The present invention provides a rotary burner of this type, which operates equally well whether the fuel be gas or atomized oil, or whether both of these fuels be used simultaneously.

Other and further objects and advantages of the invention will hereinafter more fully appear from the following detailed description taken in connection with the accompanying drawings, in

which- Fig. 1 is a longitudinal sectional view of a burner embodying the invention.

Fig. 2 is a larger scale fragmentary view of certain parts, substantially as seen from the line 2-4 of Fig. 1.

Fig. 3 is a sectional view along the line 3-3 of Fig. 2.

Fig. 4 is a view similar to Fig. 2 of a modified form of the device.

Fig. 5 is a fragmentary sectional view along the line 5-5 of Fig. 4.

Like reference characters refer to like parts in the different figures.

Burners of the type exemplified by the aforesaid Dennis patent are primarily adapted for use where there is a supply of either natural or manufactured gas. However, it has been found essential in many installations to provide for the use of liquid fuels, such as oil, as when the supply of gas fails or is insufficient to maintain the proper heat input for the furnace. In a satisfactory l and 5, the inner races of which engage with and support a hollow shaft 6 extending axially of the casing and centrally thereof. The inner races of the bearings are spaced apart by a sleeve -1 and are locked to the shaft 6 by a threaded clamping ring 8 which engages with a ring 9 on the shaft 6 and holds the bearings in position.

On the inner end of the shaft 6 is positioned a fan ill, the hub Illa of which is attached to the shaft by bolts II which extend through the hub and through a collar I2 suitably secured to the combination burner the substitution of liquid fuel for gas must not affect the heat input, since otherwise the installation could not operate at maximum eillciency at all times. Also, the change from liquid to gaseous fuel, or vice versa, must be quickly and readily effected.

As shown in Fig. 1, my improved burner provides the'usual hollow open-ended casing or shell i which is adapted to fit within an opening in the wall of a furnace, not shown, and which supports the burner in a position to deliver a combustible mixture to the combustion chamber of the furnace. Positioned centrally in casing l is .a hollow supporting hub 2, the same being here shown as carried by spider arms 2a which are secured to casing l by bolts 3. The interior of hub 2 supports spaced sets of ball bearings outside of the shaft 6 as by being welded thereto. The blades of the fan l0 project substantially to the walls of the casing I, as shown.

Also arranged to rotate with the shaft 6 is the hollow hub l3 of the fuel discharging device, the latter acting as a driver for the shaft 6 and fan It. The hub I3 is held to the hub Illa of the fan by the bolts II and the. open end of the hub is closed by a cap it held in position by screws l5.

Extending radially from the hub I 3 are two sets of hollow fuel discharging arms I64; and lib,

of each gas discharging arm is in direct communication, as shown, with the interior space M inclosed by hub l3, but this is not true of the oil discharging arms Ilia; the latter extend clear through the ring or hub l3 and have their interiors connected, as hereinafter described, with a manifold member 38 arranged interiorly of the hub or ring l3.

All of the arms Ilia and ltb are secured to the hub I3, as by the screws l1, Fig. 2, and each arm has a plurality of spaced openings or orifices I 8 through which the fuel (gas or atomized oil as the case may be) is distributed, by the rotation of said arms over substantially the entire area of the passage defined by the casing l and through which air for combustion is propelled by the fan I0. As shown in Fig. 2, the openings I8 are arranged to direct the discharging fuel at an angle to the direction of the movement of the air through the casing, and the escape of the fuel through these orifices by its reaction on the arms Ilia and/or l6b causes rotation of the entire structure connected to shaft 6, including the fan I0.

An elongated hollow sleeve I9 is supported. centrally of the shaft 6 by suitable connecting webs to provide an annular space between the shaft 6 and sleeve IQ for the passage of gas to the arms [6b. The hollow shaft 6 and its attached interior sleeve I9 have their outer ends inclosed by an extension 2| secured as by bolts 22 to the spider hub 2, said extension 2| carrying suitable packing means 2 la in surrounding relation to the end of rotary shaft 6, and having beyond this an interior chamber 24 through which is extended the sleeve 19, the chamber 24 thus communicating with the annular space between the shaft 6 and sleeve l9. A gas supply pipe is suitably connected, as shown at 23, to the chamber 24 and when the device -is used with gas as the fuel, the flow of gas, as indicated by the arrows 25, is to the interior space 44 of the hub l3, Figs. 2 and 3, and thence to the arms |6b. The discharge of gas from these arms causes rotation of the entire structure carried by shaft 6, including the fan I0, so that the fan draws air through the casing I to mix with the gas and provide for complete combustion.

The sleeve I9 at its inner end communicates with the manifold 38, and the outer end of said sleeve beyond the chamber 24 runs in a suitable bushing 32 that is arranged in another chamber 3| of extension 2|, said bushing 32 serving as a packing around the sleeve I9 and preventing communication between said chambers 24 and 3|.

The sleeve |9 supports centrally thereof an elongated tubular member 26; such support at the outer end of sleeve I9 is here shown as afforded by an interior hub or spacer 21 of said sleeve, which receives the tubular member 26 and which is connected by thin webs or the like to the sleeve |9, so as to maintain communication between chamber 3| and the annular space between sleeve l9 and tubular member 26. The latter a its inner end is threaded, as shown in Fig. 3, into a hollow member 42 having a flange connection 28 with the interior of sleeve l9, this connection, like that at 21, being by means of thin webs or spokes which maintain the annular space between sleeve l9 and tubular member 26,

for the free passage therethrough, as indicated by arrows 29, 29, of steam supplied to the chamber 3|, as by a steam supply pipe 30.

The bore of tubular member 26 is the means by which fuel oil, for atomization and admixture with the steam, is conveyed to the manifold 38- 34; within said chamber the end of tubular member 26 is surrounded by suitable packing rings 36, 36, adapted to prevent communication between the chambers 3| and 35; said rings 36, 36 are adapted to be compressed and held in effective sealing condition by an apertured gland member 31, adjustably threaded into the outer end of chamber 35.

In the form of my invention shown by Figs. 1, 2 and 3, the manifold 38, receiving steam and oil from the sleeve l9 and tube 26 for distribution to the hollow arms |6a, |6a, is of cruciform construction, as best shown in Fig. 2, to conform to the arrangement of its communicating arms |6a, |6a in alternate relation with the gas discharging arms I61), I61). Said manifold 38 has a central recess 39 in line withithe sleeve l9, and radiating from this recess are four passages 46, 40 that aline and communicate with the interiors of the hollow arms |6a, |6a. The manifold 33 fits within the hub I3 and i locked to the hubs I3 and Illa for rotation therewith, being held in position by the inner ends of the arms |6a.

In the form of my invention shown by Figs. 2 and 3, the several arms |6a, |6a supplied by the manifold 38 have a common means for effecting atomization of the fuel oil, substantially along the axis of the burner's rotation, said means, as best shown in Fig. 3, including a plurality of radial apertures 43, 43 in hollow member 42 for the discharge of the fuel oil across the passing stream of steam (arrows 29), and also including beyond this zone of oil and steam admixture, a suitable nozzle 4| which, by discharging the mix ture at an increased velocity, serves to complete the atomization of the 011. received in the central recess 39 of manifold 38 and terminates short of the bottom of said recess, so that the discharging atomized mixture impinging against said bottom has opportunity to enter the several manifold passages 40, 40 that communicate with the hollow arms |6a, |6a, Thus the atomized mixture in entering the arms |6a, |6a is obliged to take an abrupt right angle tum-this change in the path of the mixture assisting materially in excluding from the arms I 6a, |6a any unatomized portions of the oil which might otherwise pass into said arms in the form of liquid drops.

In this form of my invention, the manifold 38 leaves spaces 44,. within the hub l3, by which gaseous fuel under pressure flowing through the annular space between members 6 and i9 is directed into the hollow arm I612, I612, as best shown in Fig. 3provision being made for a small quantity of this gas to escape centrally of the burner, by Way of openings 5| in the cap l4. Thus, in this form of my invention, there are two entirely separate fuel passages through one of which gas under pressure is directed to certain of the discharge arms, namely the arms |6b, I6b whose apertures I8 are especially proportioned and designed for the discharge of gas. Such discharge will cause the gas discharging device and the associated fan to rotate at such a speed that the proper amount of air for combustion will be delivered for most eflicient operation of the.

burner. Through the other passage, including the manifold 38, the atomized oil and steam when used as the fuel, is directed into the other arms |6a, |6a whose apertures l8 are especially designed for the discharge of such fuel in sufficient amount to effect rotation of the fuel discharging device at a rate to obtain the delivery by fan H] of the required amount of air for complete combustion of the atomized oil.

With reference to the different form of my invention shown by Figs. 4 and 5, the arrangement is such that atomized oil mixed with steam is delivered by a, different type of manifold to the hollow arms |6a, |6a. In this modification, as in the structure above described, the gas under pressure when used as the fuel is delivered to certain of the discharge arms by one path and when the device is used with atomized oil this fuel reaches the remaining arms through an entirely independent and. difierentpath. The device of Figs. 4 and 5 differs from that of Figs, 1,2 and 3 only in certain parts beyond the inner ends of the tubular members 6, l9 and 26, for which reason it will be permissible in the following description to employ in certain cases the same reference numerals as used in Figs. 1, 2 and 3, and in other cases, where the elements have similar functions to those of the first-described form, to

This nozzle 4| is employ prime marks with the corresponding reference numerals.-

In the device shown by Figs. 4 and 5, the manifold for the distribution of the fuel oil to the hollow arms lGa, lid is designated by the numeral 38'; this manifold has a central recess 88' which is positioned at the discharge end of the sleeve l9. This'manifold fits within the hub l8 and is suitably locked to the hubs I 8 and we for rotation therewith. The manifold has radial passages 40' (in the example shown there are two of these passages) leading from the recess 88' to thearms lia, Ilia; each passage 48' has its own individual atomizing means for'the liquid fuel supply, in contradistinction to the common atomizing means which features the device of Figs. 1, 2 and 3; said individual atomizing means for each passage 48' and its associated arm lBa is in part constituted by a suitable nozzle 48 arranged at the outer end of said passage. In the recess 39' of manifold 38' is received an oil distributor 46 having a central axial passage 48 in line with the bore of the tubular oil-supplying member. The distributor 46 has a plurality of radially extending webs 48" which hold the distrillilutor in spaced relation to the recess bore or wa The distributor has opposed radial bores 41 which aline with the nozzles 45 and serve for the centering in each passage 40' of an individual atomizing device 48, which preferably has a plurality of radial webs 48 engageable with the walls of the passage to hold said device in spaced relation thereto. Each atomizer 48 has an axial bore 49 communicating with the bore 46' of the distributor 46. Transverse bores 58 in each atomizer are located at the outer end of the atomizer and communicate with the end of the bore 48. When the device is operated with oil as the fuel, the fiow of oil'is from the tubular member 26 into the passage 46' and thence through the bores 49 and 58 of atomizing devices 48 which discharge into As shown in Fig. 4, the manifold 38 extends diametrically of the hub l3 to communicate only with the opposite arms [6a, and to leave entirely uncovered the inner ends of the arms 16b so that gas passing through the space between the shaft 8 and sleeve l9 and into the hub i3 around the manifold, may be delivered into the arms Nib. Gas may also be discharged through openings in the cap l4, this cap also aiding in maintaining the manifold 38 in position.

When operating with gas under pressure as the fuel, the flow of gas is through the space between the sleeves 6 and i9 and into the arms lSb. As the gas escapes through the openings or discharge orifices in the arms lBb the reaction on the arms causes rotation of the fuel distributor and the fan i0 connected thereto which draws air for combustion through the casing I around and outside of the spider 2 to assure a sufiicient supply of air for complete combustion of the gas discharged from the arms [6b.

When the device is used for burning oil the oil is directed through the inlet port 34 to pass through the tubular member 28 into the bore 40' and then through the bores 48 and 50 to the atomizer nozzles 45, 45. At the same time steam or other gaseous material for atomizing the oil and for mixing therewith is directed through the steam inlet port 88 into the space between the sleeves l8 and 26 and into the bores 40' in which the atomizer nozzles are positioned. As the oil escapes through the ports 58 it is picked up and carried with the steam through the nozzles 45, 45 for its further atomization, and into the arms lGa to be discharged through the orifices in these arms. The discharge of the atomizedoil causes rotation of the distributing arms, together with the fan for drawing air for combustion through the casing i.

It will be understood that the fuel oil being in liquid form does not need to be delivered to the burners of my invention in as large quantity as does the gas if the same number of heat units are to be supplied to the boiler or other device which is served by such a burner. Because of this, a smaller number of oil-discharging arms I 6a may be utilized, as in Figs. 4 and 5, or in many instances a smaller number of orifices in the arms I Ba will suilice for assuring an output by said burner of the same number of heat units as the same burner would deliver if gas were being supplied through the arms I'Sb. Where oil is used it is still essential that equally large quantities of air be delivered to the burner for complete combustion, and by balancing the proportionate number of arms and orifices for the delivery of atomized oil, and for the delivery of gas, th proper quantity of air will always b supplied, whether oil or gas is used for the combustible fuel. Moreover, the use of steam under pressure to mix with the oil causes the discharge of the mixture through the orifices of the arms 16a at a considerably higher pressure than the discharge of gas through the arms "5b with a resultantly greater reaction on the arms to cause rotation of the discharge device and the fan. Thus a smaller number of discharge openings are necessary to obtain the desired rate of rotation of the fan.

Since the above described devices will function selectively with either 011 or gas as a fuel, it will be obvious that both oil and gas may be used simultaneously where such an operation is desirable, as where the supply of gas is not suiiicient to maintain the desired input of heat units. and thus requiring the burning of a certain amount of fuel oil, in order to attain maximum efilciency of the boiler or other device which is served by my improved burner.

I claim:

1. In a burner construction of the class described, a casing forming a passage for combustion-supporting air, a gaseous fuel supply conduit extending lengthwise of said passage, a rotatably mounted air-propelling fan in said passage, a set of hollow arms in substantially radial relation to said conduit and in communication therewith to receive gaseous fuel under pressure therefrom, said set of arms being rotatably mounted in said casing substantially coaxially with said fan, and each arm being apertured for the reaction jet discharge of said gaseous fuel under Pressure, to produce thereby the rotation of said set of rotatably-mounted arms, a second set of similarly mounted hollow arms apertured for rotation-producing reaction jet discharge of atomized liquid fuel, said fan being operatively connected to both sets of arms for rotation in unison therewith,

means extending axially through said conduit for supplying liquid fuel and an atomizing medium under pressure to the arms of said second set near th axis of said sets rotation, and means substantially in said axis for atomizing said liquid fuel by said medium.

2. In a burner construction of the class described, a casing forming a passage for combustion-supporting air, a gaseous fuel supply con .luit extending lengthwise of said passage, a rotatably mounted air-propelling fan in said passage, a set of hollow arms in substantially radial relation to said conduit and in communication therewith to receive gaseous fuel under pressure therefrom, said set of arms being rotatably mounted in said casing substantially coaxially with said fan, and

each arm being apertured for the reaction jet discharge of said gaseous fuel under pressure, to produce thereby the rotation of said set of rotatably-mounted arms, a second set of similarly mounted hollow arms apertured for rotation-producing reaction jet discharge of atomized liquid fuel, said fan being operatively connected to both sets of arms for rotation in unison therewith, means extending axially through said conduit for supplying liquid fuel, an atomizing medium under pressure to the arms of said second set near said sets axis of rotation, and means common to the arms of said second set, substantially in said axis, for atomizing said liquid fuel by said medium.

3. In a burner construction of the class described, a casing forming a passage for combustion-supporting air, a gaseous fuel supply con- 1 duit extending lengthwise of said passage, a rotatably mounted air-propelling fan in said P sage, a set of hollow arms in substantially radial relation to said conduit and in communication therewith to receive gaseous fuel under pressure therefrom, said set of arms being rotatably mounted in said casing substantially coaxially with said fan, and each arm being apertured for th reaction jet discharge of said gaseous fuel under pressure, to produce thereby the rotation of said set of rotatably-mounted arms, a second set of similarly mounted hollow arms apertured for rotation-producing reaction jet discharge of atomized liquid fuel, said fan being operatively connected to both sets of arms for rotation in unison therewith, means extending axially through said conduit for supplying liquid fuel and an atomizing medium under pressure to the arms of, said second set, and means individually associated with each arm of said second set for atomizing said liquid fuel by said medium.

4. In a burner construction of the class described, a casing forming a passage for combustion-supporting air, a gaseous fuel supply conduit extending lengthwise of said passage, a rotatably mounted air-propelling fan in said passage, a set of hollow arms in substantially radial relation to said conduit and in communication therewith to receive gaseous fuel under pressure therefrom, said set of arms being rotatably mounted in said casing substantially coaxially with said fan, and eacharm being apertured for the reaction jet discharge of said gaseous fuel under pressure, to produce thereby the rotation of said set of rotatably-mounted arms, a second set of similarly .mounted hollow arms apertured for rotation-producing reaction jet discharge of atomized liquid fuel, said fan being operatively connected to both sets of arms for rotation in unison therewith, means extending axially through said conduit for supplying liquid fuel and steam-for discharge by the arms of said second set for effecting admixture of the steam and oil and the latter's atomization, substantially at the inner ends of said arms.

5'. In a burner construction of the class described, a casing forming a passage for combustion-supporting air, a gaseous fuel suppl conduit extending lengthwise of said passage, 3, rotatably mounted air-propelling fan in said passage, a set of hollow arms in substantially radial relation to said conduit and in communication therewith to receive gaseous fuel under pressure therefrom, said set of arms being rotatably mounted in said casing substantially coaxially with said fan, and each arm being apertured for the reaction jet discharge of said gaseous fuel under pressure, .to produce thereby the rotation of said set of rotatably-mounted arms, a second set of similarly mounted hollow arms apertured for rotation-producing reaction jet discharge of atomized liquid fuel, said fan being operatively connected to both'sets of arms for rotation in unison therewith, means extending axially through said conduit for supplying liquid fuel and a gaseous atomizing medium therefor, in separate channels, for delivery to the inner ends of the arms of said second set, and atomizing means near said inner ends for bringing said liquid fuel and said medium into admixture and into fuel-atomizing relation.

6. In a burner construction of the class described, a casing forming a passage for combustion-supporting air, a gaseous fuel supply conduit extending lengthwise of said passage, a rotatably mounted air-propelling fan in said passage, a set of hollow arms in substantially radial relation to said conduit and in communication therewith to receive gaseous fuel under pressure therefrom, said set of arms being rotatably mounted in said casing substantially coaxially with said fan, and each arm being apertured for the reaction jet discharge of said gaseous fuel under pressure, to produce thereby the rotation of said set of rotatably-mounted arms, a second set of similarly mounted hollow arms apertured for rotation-producing reaction jet discharge of atomized liquid fuel, said fan being operatively connected to both sets of arms for rotation in unison therewith, means extending axially through said conduit for supplying liquid fuel and a gaseous atomizing medium therefor, in separate channels, for delivery to said second set of arms, and atomizing means near the inner ends of said arms for bringing said liquid fuel and said medium into admixture and into fuel-atomizing relation, said last-named means including a nozzle receiving said mixture in the axis of rotation of said arms, and a surface, transverse to said axis, against which said mixture is impinged by said nozzle.

'1. In a burner construction of the class described, a casing forming a passage for combustion-supporting air, a gaseous fuel supply conduit extending lengthwise of said passage, a rosaid srcond set of arms, and means common to tatably mounted air-propellingfan in said passage, a set of hollow arms in substantially radial relation to said conduit and in communication therewith to receive gaseous fuel under pressure therefrom, said set of arms being rotatably mounted in said casing substantially coaxially with said fan, and each arm being apertured for the reaction jet discharge of said gaseous fuel under pressure, to produce thereby the rotation of said set of rotatably-mounted arms, a second set of similarly mounted hollow arms apertured for rotation-producing reaction jet discharge of atomized liquid fuel, said fan being operatively connected to both sets of arms for rotation in unison therewith, means extending axially through said conduit for supplying liquid fuel and a gaseous atomizing medium therefor, in separate channels, for delivery to said second set of arms, and atomizing means near the inner ends of said arms for bringing said liquid fuel and said medium into admixture and into fuel-atomizing relation, said last-named means including a nozzle at the entrance to each arm for receiving said mixture and increasing its velocity.

8. In a burner construction of the class described, a casing forming a passage for combustion-supporting air, a gaseous fuel supply conduit extending lengthwise of said passage, a rotatably mounted air-propelling fan in said passage, a set of hollow arms in substantially radial relation to said conduit and in communication therewith to receive gaseous fuel under pressure therefrom, said set of arms being rotatably mounted in said casing substantially coaxialiy with said fan, and each arm being apertured for the reaction jet discharge of said gaseous fuel under pressure, to produce thereby the rotation of said set of rotatably-mounted arms, a second set of similarly mounted hollow arms apertured for rotation-producing reaction Jet discharge of atomized liquid fuel, said fan being operatively connected to both sets of arms for rotation in unison therewith, means extending axially through said conduit for supplying liquid fuel and steam under pressure, in separate channels, for delivery to said second set of arms, means adjacent the inner ends of said arms for directing the liquid fuel into admixture with the steam in a direction substantially transverse to the flow of the steam, and an atomizing nozzle receiving said mixture and increasing its velocity.

9. In a rotary burner for gas and oil, a casing forming a passage for combustion-supporting air, a conduit for gas under pressure extending lengthwise of said passage, an air-propelling fan rotatably mounted in said conduit, a plurality of rotatably mounted hollow arms extending substantially radially of said conduit, and connected to said fan to impart their rotation thereto, said arms being apertured for the discharge of fuel media under pressure in a plurality of Jets adapted to produce by reaction the rotation of said arms and said fan, some of said arms communicating with said conduit to receive gas under pressure, and discharge same into the air stream produced by said fan when the burner is operating on gas as its fuel, oil supply means and steam supply means both extending axially through said conduit to the zone of said arms, means in said zone for mixing the oil and steam and for atomizing the oil, and means for distributing said atomized mixture to the other hollow apertured arms for discharge into said air stream, when the burner is operating on oil as its fuel.

10. In a burner construction of the class described, a casing forming a passage for wmbuiition-supporting air, a gaseous i'ue1 supply conduit extending lengthwise of and rotatably mounted in said passage, an air-propelling fan secured to said conduit, a set of hollow arms secured to and radiating from said conduit and in communication therewith to receive gaseous fuel under pressure therefrom, each arm being apertured for the reaction jet discharge of said gaseous fuel under pressure, to produce thereby the rotation of said conduit and with it said fan, a. second set rotation-producing reaction jet discharge of of similarly arranged hollow arms apertured for through said conduit for supplying liquid fuel and steam for discharge by said second set of arms, and means common to the arms of said second set for effecting admixture of the steam and liquid fuel and the latters atomization substantially at the inner ends of the arms of said second set.

11. In a burner construction of the class described, a casing forming a passage for combustion-supporting air, a rotatably mounted air-pro. pelling fan in said passage, a set of hollow arms rotatably mounted in said casing substantially coaxialiy with said fan, each arm being apertured for reaction jet discharge of atomized liquid fuel under pressure, to produce thereby the rotation of said set of rotatably-mounted arms, said fan being operatively connected to said set of arms for rotation in unison therewith, means extending axially through said casing for conveying separate supplies of a liquid fuel and a gaseous atomizing medium under pressure to the vicinity of said arms for introduction thereto, and means substantially in the axis of rotation of said arms for atomizing said liquid fuel by said medium.

12. In a burner construction of the class described, a casing forming a passage for combustion-supporting air, a rotatably-mounted air-propelling fan in said passage, a set of hollow arms rotatably mounted in said casing substantially coaxialiy with said fan, each arm being apertured for the reaction Jet discharge of atomized liquid fuel under pressure, to produce thereby the rotation of said set of rotatably-mounted arms, said fan being operatively connected to said set of arms for rotation in unison therewith, means extending axially through said casing for conveying separate supplies of a liquid fuel and an atomiz ing medium under pressure to the vicinity of said arms for introduction thereto, and means common to said arms, substantially in the axis of their rotation, for atomizing said liquid fuel by said medium.

13. In a burner construction of the class described, a casing forming a passage for combustion-supporting air, a rotatably mounted air-propelling fan in said passage, a set of hollow arms rotatably mounted in said casing substantially coaxialiy with said fan, each arm being apertured for the reaction Jet discharge of atomized liquid fuel under pressure, to produce thereby the retation of said set of rotatably-mounted arms, saidfan being operatively connected to said set of arms for rotation in unison therewith, means extending axially through said conduit for supplying liquid fuel and an atomizing medium under pressure to each arm of said set, and means individually associated with each arm of said set for atomizing said liquid fuel by said medium.

14. In a. burner construction of the class described, a casing forming a passage for combustion-supporting air, a rotatably mounted air-propelling fan in said passage, a set of hollow arms rotatably mounted in said casing substantially coaxialiy with said fan, each arm being apertured for the reaction jet discharge of atomized liquid fuel under pressure, to produce thereby the rotation of said set of rotatably-mounted arms, said fan being operatively connected to said set of arms for rotation in unison therewith, means ex-' tending axially through said casing, for supplying liquid fuel and a gaseous atomizing medium therefor, in separate channels, for delivery to themteriors of said arms, and atomizing means near the inner ends of said arms for bringing said liquid fuel and said medium into admixture and into ruel-atomizing relation, said last-named means including a nozzle receiving said mixture in the axis oi rotation otv said arms and a surface,- trans verse to said axis, against which said mixture is impinged by said nozzle.

15. In a burner construction or the class described, a casing forming a passage for combustion-supporting air, a rotatably mounted air-'propelling tan in said passage. a set oi. hollow arms rotatably mounted in said casing substantially coaxially with said ian,'each am being apertured tor th reaction Jet discharge of atomized liquid fuel under pressure, to produce thereby the rotation of said set of rotatably-mounted arms, said tan being operatively connected to said set of arms for rotation in unison therewith, means extending axially through said casing for supplying liquid fuel and a gaseous atomizing medium therefor, in separate channels, for delivery to the interiors of said arms, and atomizing means near the inner ends of said arms for bringing said liquid fuel and said medium into admixture and into fuel-atomizing relation. said last-named means including a nomle at th entrance to each arm for receiving said mixture and increasing its velocity as it enters each of said arms.

. CARL W. GIBSON.

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