US2231884A - Oil burner construction - Google Patents

Description

Feb. 18, 1941. G. 1. CARTER OIL BURNER CONSTRUCTION Filed Feb. 25, 1937 3 Sheets-Sheet l laa FIG..1.

FIG.5

INVENTOR. QEORGE IRW/IG CARTER ATTORNEY.

Feb. 18, 1941. e. l. CART ER OIL BURNER CONSTRUCTION Filed Feb. 25, 1937 3 Sheets-Sheet 2 INVENTOR. GEQR E IRw/Yq CARTER MA CQMM ATTORNEY.

a. 1. CARTER OIL BURNER CONSTRUCTION Feb. 18, 1941.

3 SheetsSheet 3 Filed Feb. 25, 1937 INVENT OR. 6 6 IRv/r/q CARTER W ,5 650M431,

ATTORNEY.

Patented Feb. 18, 1941 v UNITED STATES PATENT OFFICE 2,231,884 on. BURNER CONSTRUCTION George Irving Carter, T mi, N. J.

Application February 25, 19s Serial No. 127,685

22 Claims.

iThis invention relates to oil burner construct on.

Particular reference, for descriptive purposes, will be had in this case to that type of oil burner construction in which, for the transformation of the oil into a state in which it is combustible efliciently, a spraying device, such asa nozzle, is used. The invention is directed, among other things, to effecting combustion of the fuel as completely as possible within a very short space, in order that such burner may be capable of utilization in ordinary household furnaces. In many burners in use, the supply of air has been so proportioned that combustion should have I proceeded eificiently; yet many factors interfered and prevented efiicient results. Combustion mayactually be completed; yet it will have been accomplished, if at all, only by introducing a large excess of air with consequent extreme loss of heat.

It is an object of,the invention to provide apparatus for burning liquid fuel in which the liquid fuel and the blast air, by the method followed in bringing the blast air to the point where the liquid fuel is atomized, necessarily results in substantially uniform intermixture of fuel and air.

Air-streams enter a blast-tube substantially tangentially to the peripheral walls of the tube, the.

air-streams then gyrating in the tube while moving along a substantially helical path up to the position of the device from which the liquid fuel is being sprayed. This centrifugal flow of the air currents has been found to incorporate the sprayed fuel quickly into the air-streams, producing substantially uniform mixture of air and fuel so that combustion may proceed rapidly.

It is an object of the invention to provide means to control the streams of air entering the tube without interfering with the tangential manner of entry of such streams into the tube.

It is an object of the invention to provide apparatus of the type specified in which the smallest number of elements possible are utilized, wherein the construction may be integrated or resolved into its elements readily, and especially wherein important elements of the apparatus may be separated as a unit from the apparatus, be replaced by a substitute unit, as, for instance, when repair may become necessary, and the unit for repair be taken to some central point for performance of such adjustments or the like as may be necessary, whereupon it may be returned quickly into position, the apparatus all the while being capable of functioning without interruption during such period of repair, and without disturbing the major body of the apparatus.

It is an object of the invention to provide, for apparatus of the type herein set forth, a single power source for making all the parts thereof effective, means made efiective by the single power source producing the separate and distinct air-streams which then act conjointly within'the tube in producing the centrifugal action.

It is an object of the invention to mount mechanism of this type in such manner that vibration is substantially absorbed in such manner as to make it unnecessary to cushion the apparatus as a whole. A single shaft, driven by the single power source, may provide, at its ends, the mountings for a plurality of blower fans, the latter being arranged to cooperate individually with ducts leading up to the blast-tube; The power source and the other elements so associated with it are assembled with a platform carried from the frame of the machine in such manner that platform, power source, and these associated elements may vibrate relatively to the body 'of the machine and yet not producenoise or other undesiriable disturbance orv situation. Yet this entire assemblage, by removal of but a single coupling, may be separated from the apparatus.

A pair of castings are utilized to define the blower chambers, the blast ducts, and the blasttube, and, at the same time, to provide a housing or cover for the operating elements of the machine. The apparatus may be constructed so that the removal of but one of such castings discloses, for inspection, all the operating elements of the apparatus; after such disclosure, by the single disconnection mentioned, the elements may be removed from the apparatus.

The structure by'which the power source and the blower fans are associated for removal as a unit may also permit the assembly therewith of means for delivering the liquid fuel under pressure to the fuel-spraying device. In the structure herein specifically disclosed, a pump is aflixed to and is carried by theplatform. The apparatus is arranged so that the pump is driven by-the same power source. The pump is thus removable from the apparatus together withthe power source. The arrangement is such that the pump is thus also supported so that its vibrations will be absorbed between platform and frame.

The connection between oil pump and spray nozzle tube is shown herein as made by a resilient metallic tube. Such tube, in a construction such as to be described herein, may be coiled in such manner that the tube itself functions as a resilient damping member, functioning to. absorb or dampen vibration between platform and frame.

Other objects of this invention will hereinafter be set forth, or will be apparent from the description and the drawings, in which are illustrated certain elements considered pertinent for the demonstration of the invention.

The invention, however, is not intended to be restricted to any particular method of operation, construction, or arrangement of parts,

herein shown and described, or to any particular application of any such apparatus or method, or to any specific manner of use, or to any of various details thereof, herein shown and described, as the same may be modified in various particulars, or be applied in-many varied relations, without departing from the spirit and scope of the claimed invention, the elements herein illustrated and described being merely types showing some of various forms the invention might take for practical purposes.

0n the drawings in which the same reference characters refer to the same parts throughout, and in which are shown the elements mentioned:

Fig. 1 is a plan view of an oil burner embodying features of the invention;

Fig. 2 is an elevational view of the oil burner shown in Fig. 1:

Fig. 3 is a plan view of the oil burner shown in Fig. 1, to an enlarged scale, the cover being removed to disclose the interior construction of the apparatus, the blower fans being broken away in section to clarify the relationship of parts; the motor and the oil pump, and the connecting belt, being shown by dot-and-dash lines;

Fig. 4 is a cross-sectional view substantially as seen from the line 4--4 of Fig. 1, and substantially to the same scale as Fig. 3; the transformer, the motor and the oil pump and the belt connecting them, being shown by dot-and-dash lines; and certain parts being shown in elevation to clarify the disclosure; one of the feet of the mounting, shown in elevation, being associated with a'support member shown in cross-section, to illustrate that association;

Fig. 5 is a view in cross-section substantially as seen from the line 5-5 of Fig. 1, and substan tially to the same scale as Fig. 3, illustrating the arrangement of the control means for the air flow, the valve controlling the tangential action being shown at fully opened position;

Fig. 6 is a detail cross-sectional view, to an enlarged scale, on the line H of Fig. 2; and

Fig. 7 is a view of the casing structure, as seen in vertical cross-section from a vertical plane passing through the axis of the motor and fans in Fig. 2, with all parts removed from the apparatus, to illustrate the construction of the casing, the view being one looking from the position of the motor towards the blast tube.

The. oil burner, as shown on the drawings, may consist of a frame F, which, in turn, may include a casing I2 carried upon supports l4. .Within frame F may be disposed a motor M, which may be of any desired construction, to drive blower fans l5 and it of the blowers B, and an oil pump P. The fans are disposed in wells 20 and 22,

and discharge into ducts 24 and 28. Associated with the motor is a transformer T for supplying high tension current to electrodes E disposed within blast-tube 28.

' Casing i2, may be made up of a pair of castings defining a base 30 and-a cover 32. Base and cover are intended to cooperate in a manner hereinafter to be described. The base, which may be a substantially Y-shaped casting, may be shaped to define the bottom sections 34 and 36 of blower wells 20 and 22, from which sections the bottom sections 38 and 40 defining ducts 24 and 26 extend forwardly, sections 38 and 40 then converging into the bottom section 42 of control chamber 44 which leads directly into blast-tube 2!, sections 34 and II and 28 and 40 cooperating to define the arms of the Y, while section 42 and the blast-tube define the leg of the Y.

A lug 48 may extend downwardly from section 42 to define one of supports H. In lug 48 a vertical channel 48 may be formed to receive a leg I. fitted to slide vertically within the channel. A slot 82 through the. leg and extending substantially vertically may be provided to receive a bolt '4 engaged in lug ll, the head of the bolt, when the bolt is tightened, pressing against leg I. at the sides of slot 82 to retain leg ll fixed in position after adjustment.

Leg 4. is thus substantially centrally disposed below the apparatus as a whole. At the rear portions of the inner faces I and 58 of wells 2. and 22, vertically extending ribs ll are formed. Legs 82, with slots 84 similar to slot 82 substantially encompassing these ribs, are capable of sliding vertically relatively to the ribs. Bolts I6, engaged in faces 56 and I immediately at the ribs, extend through slots 84, and, in a manner similar to bolt 4, look legs 82 in position after the legs have been slid to a desired position. Legs II and 82 each have footings 68 to provide a foundation for the machine. Thus, the entire assembly is provided a three-point support.

Each of the sections 34 and 38 is substantially identical in construction. Each has an outer wall II which is unbroken in its extent. Each inner wall 12 is, however, formed with an-opening I4 substantially U-shaped in form to permit air to flow to fans II and II. The fans are set in the wells in the usual manner so that walls II of the wells are closely adjacent'the fans, while end walls 18 are considerably removed from the fans, in order to insure efilcient discharge of air from the fans into ducts 24 and 28. as well as the eflicient pick-up of air supplied to the fans be propelled thereby. Fans I8 and ll, of tially identical capacity, may be of any desired construction; in the particular case shown, they are of the squirrel-cage type. Shaft ll of-motor M extends completely through the motor, and on the extending ends of the shaft the fans are mounted, thus providing a substantially balanced assembly.

Motor M may have mounting legs 82 by means of which the motoris secured toa platform .4 so that the motor is suspended from the platform, the motor carrying with it, of course, shaft Cl and the fans thereto secured. Platform .4 is provided with a number of feet 88. These feet are tapered downwardly, terminating in pins 81, at the junction of which with the bodies of the feet are defined shoulders resting. on complementary shoulders in wall 94. of section 42 formed at the crotch oi' the Y of casting 30, and extending laterally from the faces and from wall 94 so as to be located entirely within the space 86 enclosed by wells 20 and 22, the associated ducts, and section 42. Thus, these bosses and feet I, as will appear .more fully hereinafter, are beyond the extent of any portion of cover 22 so that 'the cover may easily be slipped into position. The tapered ends of feet I6, extending into the bores of members 88, tend to distend the members so that they resiliently engage the walls of recesses 9|. A bracket 9| has a footing engaged against the bottom face of platform 84, the bracket providing a pair of lugs I08 for engagement against a face I02 of oil pump P, whereby the oil pump may be retained rigidly with relation to the platform. Any suitable type of oil pump structure may be utilized for the purposes of this invention. In the particular case shown, the pump, one of small extent, as, for instance, of the gear type, has a shaft I04 extending laterally therefrom. On this shaft is a pulley I08 over which is trained a belt I08 to be engaged over a pulley IIO secured on shaft 80.. In this manner, motor M simultaneously drives the oil pump while the Y entire assembly is mounted on platform 84 which in turn is cushioned through members 88 to absorb any vibration produced as blowers and oil pump operate.

In. the case shown, an oil-filtering chamber 2 is substantially integrally formed with the oil pump. From chamber II2 leads piping II4, connected in turn to spray tube II8. on wall 84 may be an extending ledge II8 formed with a semi-cylindrical recess I20 in which one end I22 of tube II8 may be supported. A clamp piece,

I24 having a complementary recess I26 is positioned over end I22 seated in recess I20, and is held secured in position by suitable devices I28,

such as cap screws or the like, thus retaining the tube in position. Suitable means such as a coupling I30 serves to connect piping II4 with tube II6. Piping II4 may be vof resilient copper or similar metal, and may be bent into a loop I32 in such manner that it will form a resilient connection between the frame and the oil pump. Such a connection would function to dampen vibrations, with relation to the cas-- ing, 01' elements mounted upon the platform.

Tube II6 extends beyond wall 84 to pass through a spider I34 positioned within blast-tube 28, the radiating legs I36 of which are of such length as to contact with the walls of the blasttube and thus provide a support for tube H8 and electrodes E which also are carried in the spider. The spider may be secured on tube II6, as, for instanceQby a set-screw, to retain the assembly in position. Suitable passages I38 are formed in the legs of the spider for insertion of the electrodes, the legs being slit up to the passages, and any suitable compressing meansbeing utilized, in order to clamp the electrodes in posidownwardly through a cut-away section I48 .of

the platform, and then through insulating nipples I50 mounted in wall 84 to be coupled to the electrodes. The nipples are seated in notehe I52 formed in the wall.

be retained in sition on the- Cover 32 may p0 I86. a section base by suitable securing devices I54, such as cap screws, extended through openings I58 at bosses I58 provided for that purpose in the cover, to engage within tapped openings I60 in similar bosses I62 in the base. Cover 32 can be considered to'be divided into three distinct portions. Looking at the cover as if it were inverted, it will be found that there is a large well I64 which coincides with space 88 and within which the upward extension of the platform and the transformer is housed. As a matter of fact, when the 1 tions 34 and 30' in defining blower wells 20 and 22, and top sections I10 and "Ho cooperate with sections 38 and 48 in defining ducts 24 and 26. For the production of these different sections, wall I14, which defines well I64, seats immediately over the top edges of walls 12 and over wall 84 when the cover is in position. Wall I14 does not, however, interfere with bosses 82 nor with the cooperation with said bossw of feet 86 as the wall is no thicker than the normal thickness of walls 12. ,Notches I52 are closed by a section I16 of wall I14 complementary to the formation of the electrodes; section I16 also has a cut-out I18 likewise complementary to tion I84 terminates in a bell I88. The bell rests upon the inner edge of the blast-tube, thus producing a substantially sealed tube.

Ducts 24 and 26, defined by sections 38 and 40, and the complementary sections I10 and I12 of cover 32, are substantially parallel to each other, and are substantially at the same level. However, in the delivery ducts I88 and I80 providing communication between ducts 24 and 28' and control chamber 44, a different construction is involved. I Duct I88 is directed upwardly to meet control chamber 44 tangentially at its uppermost portion, while duct I80, on the other hand, is directed downwardly to meet control chamber 44 tangentially at its lowermost portion so that its air-streamwill enter the chamber substantially at its lowermost portion, and di ametrically' opposite the position of entry of the stream from duct I88. Considering a section of the apparatus such as shown in Fig. 5, which is transversely across the chamber and the associated apparatus at this intersection, the construction will be found to define a pair of ports I82 and I84 opening between the respective ducts I88 and I80'and the chamber. The incline of the respective ducts to' the respective ports is such that the respective air-streams en 1'' blast-tube substantially tangentially. Bot l'fduh t; are directed forwardly at a slight angle so that, despite the fact that. the streams enter the chamber going substantially in opposite directrons, yet, by reason of the fact that the points of entry are at substantially oppositely disposed diametrical positions, and by reason of the slight forward inclination of the ducts, a helicalflow of both air-streams within the blast-tube will result.

In chamber 44 is disposed a cylindrical shell of which is completely broken away to provide an. opening I88, while, at the oppositely disposed portion of the shell, another opening 200 of the same character is formed, except that a rib 202 connects the two plates 204 and 206 of the shell thus defined, so that the plates may rotate together and simultaneously. Plates 2 04 and 206, in their movement, control the opening of ports I82 and I94, and thus provide means for controlling the flow of air from the blower fans into the blast tube. However,. it

will be noted that the opening edges 2" of the plates move towards and away from the extreme top wall and extreme bottom walls of ducts I88 and I90, respectively, so that the air-flow to chamber 44 will, at all times, be restricted to the outermost portions of the ducts and cham her, so that the tangential action of these airstreams will not be affected, the only eflect being in more finely defining the extent of these air-streams as they enter the chamber, and the blast-tube which lies immediately adjacent. A

bolt 2M may be engaged with rib 202, and be extended through a slot ii! in wall 2 of the chamber, thus providing means for manipulating the valve defined by shell I96 from a position externally of the blast-tube. By tightening the bolt into engagement with wall 2, it provides means for fixing the valve in position, once it has been adjusted.

In the substantially parallel sections of ducts 24 and 26, dampers 2l8 may be provided. These dampers may be in the form of circular plates Ill, held substantially in the same plane, but at opposite ends of a single rod 220 so thatthey are simultaneously movable and to the same degree. This rod may be located in notches 222 in walls 12 which cooperate with similar notches in wall I I4, so that the rod is locked in position by the assembly of the cover with the base. These dampers may be used to control the quantity of air flowing to ports I92 and I94 without varying the fineness of the stream entering the chamber.

A crank arm 228 may be affixed to rod 220 and be pivotally connected to a link 2". The link may have a slot 232 in the body thereof through which may extend a bolt 2 to engage in one oi faces 56 or 58 to be used as means for locking the dampers in an adjusted position.

The air-streams, entering the blast-tube, by

the position of their entry, will swirl through the blast-tube. The slight forward propulsion of the streams entering chamber 44, in addition to the pressures attained, serve to cause the streams to move forwardly towards the nozzle.

Since, from this swirling action, to a degree at least, the moving gases will tend to move out close to the outer walls of the fire-tube, a mouthpiece ring 238 may be assembled at the extreme end of the blast tube in order more positively to converge the gases once they have picked upthe liquid fuel. This mouthpiece may have a converging inner wall 23. coming up to an outlet opening 2 smaller than the bore of the blasttube. The continuously swirling gases will thus be brought more closely into intermixing relationship with the fuel as they pass beyond that point because of this close relationship between gases and fuel to be consumed. The ring may be held in position by means of set-screws 2, extended through 'the walls of the blast-tube adjacent the end, and engaged in a groove 2 in a flange 246 of the ring. 2

After screws I54 have been removed, the cover may be separated from the base at will merely by disconnecting coupling I 30, and thusreleasing the connectionbetween the oil pump and tube 6, the platform together with its assembled elements may be liftedout of position. Of course,

rod 220 may be disconnected from the apparatus by releasing its bolt 234 to permit this separation. Once the separation has been effected, a similar and identical unit may be placed in position, and by these simple connections, made to function in place of the other unit, which may then be removed to a central factory for such repairs as may be found necessary.

Many other changes could be eifected in the particular elements designed, and in the methods of operation and use, and in the apparatus herein set forth, and in specific details thereof, without substantially departing from the invention intended to be defined in the claims, the description being merely of elements illustrating certain phases of the spirit oi the invention.

What is claimed as new and useful is:- 1. Inoil burner construction, a plurality of airblast ducts, a single blast-tube, the blast-tube at one end thereof having a plurality of ports opening'therethrough, each of the ducts discharging into the blast-tube through one of the ports, the

direction of the air-blasts from the several ducts entering the blast-tube through the several ports producing a single cyclonic air-flow the blasttube, and means for simultaneously controlling the effective opening of all the ports.

-2. In oil burner construction, a plurality of airblast ducts, a single blast-tube, the blast-tube at one end thereof having a plurality of ports opening therethrough, each of the ducts discharging into the blast-tube through one of the ports, the direction of the air-blasts from the several ducts entering the blast-tube through the several ports producing a single cyclonic air-flow through the blast-tube, and means mounted for rotation in the blast-tube to control simultaneously the effective opening of all the ports.

3. Incl] burner construction, a pair of airblast ducts extending in substantially the same general direction, a single blast-tube between and extending in substantially the samegeneral di-.

rection as the ducts, an oil-diffusing device within the blast-tube and disposed substantially axiaily thereof, the blast-tube at one end thereofhaving substantially diametrically opposed ports opening therethrough, each of the ductsbeing provided with an end to connect the duct to a port, means for simultaneously impelling air through the ducts substantially in the same general direction, the end of each duct being directed obliquely forward in the same general direction as its duct, the direction of the air-blasts from the ducts entering the blast-tube through the several ports being effective to cause the air within the blast-tube to move up to the oil-diffusing device blast ducts, a single blast-tube, the blast-tube at one end thereof having a plurality of ports opening therethrough, each of the ducts discharging into the blast-tube through one of the ports, means for simultaneously impelling air through the ducts substantially in the same general direction, the direction of the air-blasts from the several ducts entering the blast-tube through the several ports producing a single cyclonic air.- fiow through the blast-tubejmeans' for controlling the efl'ective opening of the ports, and means for simultaneously controlling the fiow of air through all the ducts independently of the port controlling means.

5. In oil burner construction, a pair of air-blast ducts extending in substantially the same general direction, a single blast-tube between and extendmg in substantially the same general direction each of the ducts discharginginto the blast-tube through one of the ports, means for simultaneously impelling air through the ducts substantially in the same general direction, the direction of the air-blasts from the ducts entering the blast-tube through the several ports producing a single cyclonic air-flow through the blast-tube, means for controlling the efiective opening of the ports, a rod extending transversely'of and into both ducts, a plate on the rod in each of the ducts for simultaneously controlling the flow of air through the ducts, and means for rotating the rod.

'6. In oil burner construction, a Y-shaped frame, the leg of the Y being defined bya blasttube, the arms of the Y being defined by a pair of blower casings and blast ducts leading away from the blower casings to the blast-tube; a carrier resiliently supported'upon and between the ducts; a motor suspended from the carrier, the shaft of the motor extending in opposite directions from the motor and into both casings; and a blower on the shaft in each of the casings.

7. In oil burner construction, a frame including a blast-tube, a pair of legs extending substantially parallelly away from 'the blast-tube and spaced from each other to provide an opening behind the blast-tube, the legs being substantially open sections, each leg being provided with in communicating open section to provide a connection to the blast-tube, and a single cover for the frame and for the opening to form blast ducts with the open sections.

8. In oil burner construction, a frame including a blast-tube, a pair of legs extending substantially parallelly away from the blast-tube and spaced from each other to provide an opening behind the blast-#tube, the legs being substantially open sections, each leg being provided at one end with a communicating open'section to provide a connection to the blast tube, blower wells at the other ends of the leg open sections, a single cover for the frame and for the opening to form blast ducts with the open'sections and blower casings with-the blower wells, a shaftextending into both casings, a blower on the shaft in each of the casings, a motor carried in the opening for driving the shaft, and support means for the frame, the support means comprising three members, two of the members being positioned individually in association with the casings, and one of the members being positioned beneath the blast-tube, each'of the members being individually'adjustable to regulate its own height.

9. In oil burner construction, a frame including a blast-tube, ,a pair of legs extending substantially parallelly away from the blast-tube and spaced from each other to provide an opening behind the blast-tube, the legs being substantially open sections, each leg-being provided at one, end with a communicating open section to provide a connection to the blast-tube, blower wells at the other ends of the leg open sections, a single cover for the frame andfor the opening to form blast ducts with the open sections andblower casings with the blower wells, a carrierresiliently supported upon the frame and in the opening between the legs, a motor supported by the carrier, the shaft. of the motor extending in opposite directions from the motor and into both casings, a blower on the shaft in each of the cas-' ings, and support means for the frame, the support means comprising three members, two of the members being positioned individually in association with the MEL, and one of the members being positioned beneath the blast-tube. each ,of the members being individually adjustable to regulate its own height. a

10. In oil burner construction, a frame including a blast-tube, and a pair of legs extending substantially parallelly away from the blast-tube and spaced from each other to provide an opening behind the blast-tube; the legs being substantially open sections,\the legs having a common junction point at one end with the blasttube, blower walls at the other ends of the leg open sections; a single cover for the frame, for the junction point, and for the opening to form blast duets with the open sections and blower casings with the blower wells; the blast-tube at diametrically opposed portions thereof at the junction point having portsto provide individual communication for each blast duct with the blast-tube; a single valve at the junction point for determining the degree of opening of the ports; an oil-,diflusing device in the blast-tube; electrodes in the blast-tube; a carrier resiliently supported upon and in the opening, a transform er for the electrodes mounted on the carrier; a motor and an oil-pump suspended from the carrier, the shaft of the motor extending in opposite directions from the motor and into both casings; means on the shaft for driving the oil-pump; a blower on' the shaft in each of the casings; and support means for'the frame, the support means comprising three members, two of the members being positioned individually in association with the casings, and one of the members being positioned beneath the blast-tube, each of the members being individually adjustable to regulate its own height.

11. In oil burner construction, a plurality of air-blast ducts, a single blast-tube having a pluralityof ports opening through the walls of the blast-tube at one end thereof, each duct. being connected to the blast-tube through one of the ports and bei g positioned to direct its blast through the port tangentially of the blast-tube, the direction of the airblasts from the several ducts entering the blast-tube through the several ports producing a single cyclonic air flow through the blast-tube, andmeans for controlling the effective opening of the ports while maintaining the tangential direction of the blasts. x

12. In oil burner construction, a plurality of air-blast ducts, a single blast-tube having a plurality of ports opening through the walls of the blast-tube at one end thereof, each duct being connected to the blast-tube through one of the ports and being positioned to direct its blast through the port tangentiallyof theblast-tube, the direction of the air-blasts from the several ducts entering the blast-tube through the several ports producing a single cyclonic air flow through the blast-tube, and a single valve for simultaneously controlling the eflective opening of all the ports while maintaining the tangential direction of the blasts. I

13. In oil burner construction, a plurality of air-blast ducts, a single blast-tube having a plurality of ports opening through the walls of the blast-tube at one end thereof, each duct being connected to the blast-tube through one of the ports and being positioned to direct its blast through the port tangentially of the blast-tube, the direction of the air-blasts from the several ducts entering the blast-tube through the several ports producing a single cyclonic air flow through the blast-tube, and a sleeve mounted for iii the blasts while maintaining the tangential direction of the blasts.

14. In oil burner construction, a pair of airblast ducts extending in substantially the same general direction, a single blast-tube between and extending in substantially that same general direction, an oil-diffusing device within the blasttube and disposed substantially axially thereof, the walls of the blast-tube at substantially diametrically opposed positions at one end thereof having ports opening therethrough, each duct being Provided with an end to connectthe duct to the port, means for impelling air simultaneously and substantially at the same rate through the ducts substantially in that same general direction, the duct end being directed obliquely forward in that same general direction so that airblasts from the ducts entering the blast-tube through the several ports cause the air within the blast-tube to move upto the oil-diffusing device as a single cyclonic air-flow moving in substantially that same general direction through the blast-tube, and means for controlling the eifective air delivery through the ports. I

15. In oil burner construction, a Y-shaped frame, the leg of the Y being defined by a blasttube; the arms of the Y being defined by a pair of blower casings and blast ducts leading away from the blower casings to the blast-tube, the ducts and the casings being positioned in spaced apart rela nship; the walls of the casings being substantially unbroken except for air inlets in directly opposed walls of the casings opening into the space between the casings; a motor mounted within the space between the casings, the shaft of the motor extending out of the space in opposite directions from the motor and into both c'asings through the air inlets, and a blower on the shaft in each of the casings.

16. In oil burner construction, a frame including a blast-tube, a pair of legs extending substantially parallelly away from the blast-tube and spaced from each other to provide an opening behind the blast-tube, each leg being substantially an open section of a tube, each leg being provided at one end with an open section connecting the leg to the blast-tube, blower wells at the other ends of the leg open sections, opposed walls of the wells having air inlets opening therethrough, and a single cover extending over both legs and the wells to form blast ducts with the open sections of the tubes, and to form with the blower wells blower casings having air inlets opening into the space between the blower wells.

17. In oil burner construction, a plurality of air-blast ducts, a single blast-tube, and communicating means between the ducts and the blast-tube for directing the several blasts from the ducts angularly forwardly away from the point of entry and also tangentially of the blasttube at the point of entry into the blast-tube to unite within the blast-tube to produce a single air flow moving through the blast-tube away from the entry end but gyrating cyclonically about the axis of the blast-tube.

' 18. In oil burner construction, a plurality of air-blast ducts, a single blast-tube, and communicating means between the ducts and the tube; the arms of the Y being defined by a pair of blower casings and blast ducts leading'away from the blower casings to the blast-tube, the ducts being positioned in spaced apart relationship; a carrier in the space between the ducts and removably supportedupon the ducts, a motor supported by the carrier and within the space, the shaft of the motor extending out of the space in opposite directions from the motor and into both casings, and a blower on the shaft in each of the casings.

20. In oil burner construction, a plurality of substantially parallel air-blast ducts, a single blast-tube, individual means cooperating with each duct for impelling air simultaneously and substantially in the same general direction through the several ducts, and means for guiding the air-blasts from the several ducts into the blast-tube substantially tangentially of the blasttube and in a direction having a substantial directional component of said general direction,-the guiding means being positioned relatively to the blast-tube so that the air-blasts unite in the blast-tube into a single cyclonic air-flow moving through the blast-tube in substantially that same general direction.

21. In oil burner construction, a plurality of substantially parallel air-blast ducts, a single blast-tube between and substantially parallel to the ducts, the blast-tube having a plurality of ports opening therethrough adjacent one end thereof, individual means in each duct for ilnpelling air substantially in the same general direction simultaneously-through the several ducts,

and each of the ducts being provided with an end bent angularly forwardly and connected to a port to direct its air-blast from its duct substantially tangentially into the blast-tube through the port with a substantial directional component of said general direction but as an element of a single cyclonic air-flow moving in substantially that same general direction through the blast-tube.

22. In oil burner construction, a plurality of air-blast ducts, a single blast-tube, a blower for GEO. '1. mm.

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