US1930812A - Oil burner - Google Patents

Description

Oct. 17, 1933.

H. A. KUNITZ OIL BURNER Filed Nov. 13, 1931 2 Sheets-Sheet l INVENTOR. H4 N/V/BAL A. Ku/v/rz BY 2 M ATTORNEYS.

2 Sheets-Sheet 2 H. A. KUNITZ OIL BURNER Filed Nov. 13, 1931 J n ////7// n INVENTOR.

HA NN/BAL A. Ku/vT/Z BY @am 4% M A TTORNEYS.

Oct. 17, 1933.

Patented Oct. 17, 1933 OIL BURNER Hannibal A. Kunitz, Stratford, Conn, assignor to Gilbert 8: Barker Manufacturing Company, West Springfield, Mass., a corporation of Massachusetts Application November 13, 1931 Serial No. 574,797

3 Claims. (Cl. 158-73) This invention relates to improvements in 011 Fig. 6 is a fragmentary cross sectional view burners and, more particularly, to improved taken on the line6-6 of Fig. 3. means for protecting the nozzle end of the Referring to these drawings: I have shown, by burner from the intense heat radiating from the way of illustrative example, one type of burner walls of the furnace, at times when the burner in which my invention may be used to advantage. 60 is not in use. The burner shown herein, is of the rotary, atom- Various means have been heretofore proposed izing cup type. The invention, however, is capafor accomplishing the same general object but ble of embodiment in burners of other types. such means depend on the withdrawal of the The illustrated burner includes a barrel 10 1g nozzle end of the burner out of the furnace. A (Fig. 3) in the nature of a cylindrical tube, one 05 movable mou o the burner is e s a y inend of which is closed, as by a head 11 held in asmuch as the entire burner has to be bodily place by screws 12. The other end of barrel 10 moved into or out of firing position. is open and the barrel is mounted, as shown in S invention iS intended to c plish the Fig. 2, sothat the open end extends through S d Object Without requiring a ab an opening 0 in the wall w of the furnace into 70 m unt of t burner an dily v m t the firebox 1. Such end of the barrel is preferoi the entire burner into and out f fi in D ably made with a removable and nozzle-forming 61011. The b Which is fi in firing D portion 13 (Fig. 3). Air is admitted to the intion with its nozzle end inser ed in e furnace.v terior of barrel 10 near the opposite end thereof,

is protected from the heat of the latter by means through a vertical pipe 14, formed integrally 75 of a sleeve which is telescoped over the burner ith d depending from th barrel, This pipe barrel and m y be Projected a Substantial 14 is adapted for connection to an air supply tance beyond the nozzle end thereof into the furpipe 1; (Fig, 2) leading from 9, suitable source mice when t e burner is pp The Sleeve, of air under pressure, as from a blower or air rather than the nozzle or nozzles of the burner, compressor The pipe 14 by t connection t is subjected to the direct flCtiOIl 0f the furnace pipe p, serves as a, support, for the burner heat and the nozzles are protected from the same w thi t nozzle 13 of th b l i t d by lyin within the sleeve at a location spaced an atomizing cup 15 (Fig.3) having its inner end back a Substanti d s from the p inner closed and its outer end open and having an out- 30 end of the sleeve. wardly flaring circular wall. On the back of the The invention also has o a ject the p closed end of the cup is a threaded hub 16 which vision of means for automati ally l sin off t screws into one end of the drum 17 of an air oil supply to the burner, whenever the sleeve is turbine, the blades of which are represented at Projected into its heat Protecting position. 18. This drum is rotatably supported, as by ball 5 Other objects of the invention relates to probearings 19, from a hollow spindle 20. This 90 V S dissipating e heat imparted to the spindle, at one end, is screwed into the hub of a sleeve and for cooling the same when in its spider 21,f1xedinbarrel 10. Air, passing through Projected and P ing position. barrel 10 and into air nozzle 13, is forced to turn O r Objects will i P as the detailed the blades 18 and rotate the cup 15. Such air,

scription proceeds. after leaving the turbine, emerges in an annular 95 The invention will be disclosed with re erenc stream through the space between the inner to the accomp y g drawings, in which: peripheral wall of the air nozzle 13 and the outer F g. 1 is an exterior side elevational view of peripheral wall of the coil nozzle or cup 15. Oil is an oil burner embodying my invention; supplied to the inner periphery of cup 15 by way Fig. 2 is a similar view, drawn to a slightly of alined axial passages 22 and 23 in the spindle 100 smaller scale, showing the relation of the burner 20 and hub 16, respectively, and emerges through to the furnace and showing the protecting sleeve a. special pipe fitting 24. Such oil drops onto the in projected position for protecting the nozzle flaring wall of the rapidly rotating cup 15 near end of the burner from the heat of the furnace; its inner end, and travels outwardly along such Fig. 3 is a sectional elevational view of the wall, being thrown centrifugally from the outer 105 burner; edge of the eup to mingle with the air stream Fig. 4 is a cross sectional view taken on the from nozzle 13 and form a hollow conical spray line -i4 of Fig. 3; in the usual and well known way.

Fig. 5 is an end elevational view of the burner; The oil supply to the atomizing cup is controlled and by a needle valve 25, which cooperates with the 0 inner end of the hollow spindle 20 to open or close the entrance end of passage 22. Oil is supplied to such passage by a pipe 26 which connects the hub of spider 21 to an axial passage 27 in head 11. The joint between the pipe 26 and head is sealed by a stufiing box 28. The needle valve passes through pipe 26 and head ll and emerges from the latter through a stuffing box 29. The needle valve is guided in pipe 26 by two pins 30 which are disposed at right angles (see also Fig. 4) and pass diametrically through the valve stem with their projecting outer ends slidably engaging the inner wall of pipe 26.

The oil supply is further controlled by a regulating valve 31 (Figs. 1 and 5) of any suitable type. Oil is forced from any suitable source and by any suitable means to the lower end of valve 31 and passes from the upper end of the valve by way of a pipe 32 into a radial passage 33 formed in head 11 and thence into the passage 27 to pipe 26.

The air supply may be regulated by a butterfly valve 34 (Figs. 3 and 5) mounted in the walls of pipe 14 and movable by a pair of levers 35, the upper ends of which frictionally engage between them a sector 36, fixed to barrel 10.

The burner, above described,- will serve as an example of one of many types with which my invention may be employed. The invention has to do more particularly with the protection of the nozzle end of the burner from the heat of the furnace f at times when the burner is not in use and, obviously therefore, the invention is or may be largely independent of the described details of the burner mechanism.

The invention makes use of a sleeve 37 (Fig. 3) which normally (during burner operation) is retracted as shown in Figs. 1 and 3. This sleeve encompasses the air nozzle 13 of barrel 10 and is slidable relatively thereto in the direction of the axis of the barrel. This sleeve can be manually moved, when desired, to project beyond the nozzles 13 and 15, as shown in Fig. 2, in which position it protects these nozzles from the intense heat of thefurnace. The sleeve 37 has a long, integral, rearward extension 38 of larger diameter by which it is slidably supported from barrel 10. Preferably, such support is effected through radial fins 39, formed onv and extending longitudinally of the barrel. The inner surface of extension 38 slidably engage the outer edges of these fins. The support of the sleeve is thus eifected with only a relatively small amount of contact area with barrel 10 to minimize conduction of heat from the sleeve to the barrel. Between the fins are air channels which enable air to be drawn into the furnace by the natural draft thereof through the space between the sleeve and barrel,for cooling purposes. The sleeve 37, it will be noted, is circumferentially spaced from nozzle 13 so as to leave a passage for the cooling air. Preferably, the sleeve extension 38 is provided with radiating fins. These may be placed on the outside of the barrel if necessary, but I prefer an internal series of fins 40, which are similar to fins 39 but which preferably do not touch the barrel 10. These fins 40 as well as fins 39 serve to radiate heat and aid in keeping the sleeve and barrel 10 as cool as possible. It will be noted from Fig. 4 that there are two relatively short and closely spaced fins 39 which receive between them one of the fins 40 in such a way as to prevent turning of the sleeve on the barrel.

It is desirable that the flow of oil to cup 15 be positively and automatically cut off whenever the protector sleeve is moved into the projected position shown in Fig. 2. The valve 25 is provided for this purpose and its operating mechanism is interrelated with the sleeve to accomplish the above result. A valve operating lever 41, pivotally mounted at its lower end in a support 42 secured to head 12, is slidably engaged at a point intermediate its ends with the outer end of the valve rod 25 and is engaged on opposite sides by collars 43 thereon. The upper end of lever 41 is forked .and received between a pair of collars 44 secured to a valve operating rod 45. This rod is slidably mounted in head 11 and in a lug 46 which upstands from barrel 10. The rod 45 extends beyond lug 46 and carries a coil spring 4'7 which acts between the lug and a collar 48 on rod 45 with a tendency to force the rod to the right and cause a closing of valve 25. When the protector sleeve 37 is in retracted position, a lug 49 formed on the outer end of one of the fins 40 engages an end of rod 45 and holds the latter against movement by spring 47, thus holding valve 25 open. When the sleeve is projected into the position shown in Fig. 2, the lug 49 is carried away from rod 45 and the spring 47 moves it to the right causing valve 25 to close.

In order to hold sleeve 37 in retracted position and to hold rod 45 against movement by spring 47, alatch 50 of inverted U-shape in cross section, is pivoted to lug 49 at one end and has its other end notched to engage over lug 46, as clearly shown in Fig. 3. This latch has a suitable handle 51 fixed thereto. By lifting this handle, the latch is released from lug 46 and-the spring 47 released to close valve 25. The handle is then used as a means for moving sleeve 37 into projected position and subsequently back into the position shown in Fig. 3.

The normal operation of the burner is the same as in any ordinary burner of the type disclosed. Oil is fed to the rotating cup 15 and thrown centrifugally from the rim thereof to be mixed with air flowing from the air nozzle 13. Additional air to support combustion enters the furnace through the opening 0 in the furnace wall and also through the channels between the protector sleeve 37 and nozzle 13. When the burner is stopped, the operator lifts latch 50 by means of handle 51 and forces the sleeve 3'7 forwardly into the position shown in Fig. 2. This act releases slide rod 45 and allows it to move to the right under the force of spring 47 to close the oil valve 25, thus automatically cutting off the fiow of oil to cup 15. When the burner is again to be started, it is necessary to manually draw the protector sleeve back into retracted position in order to open the oil valve 25 and admit fuel to cup 13.

The protectu sleeve receives much of the heat which would otherwise act on the oil cup. This sleeve is a good conductor of heat and conducts heat out of the furnace from the vicinity of the cup 15. Such hear is rapidly dissipated because of the large exposed surface area of the sleeve and because of its radiating fins and because of the flow of cooling air along both the outer and the inner surface of the sleeve. Thus, the sleeve shields the cup 15, as well as the air nozzle 13, from the damaging effects of the heat radiated from the furnace walls after stoppage of the burner.

The invention has been disclosed herein, in an embodiment at present preferred, for illustrative purposes, but the scope of the invention is defined by the appended claims rather than by the foregoing description.

What I claim is:

1. In combination, a burner barrel constituting a conductor for an atomizing medium and the outlet end of which is adapted to be exposed to the heat of a furnace, a fuel conductor the outlet end of which is mounted in said end of the barrel, means for protecting said end and outlets from the heat of the furnace when required, said means comprising a sleeve telescoped over the burner barrel for quick movement in the direction of the axis thereof from a normal retracted position in which the outlet end of the barrel is exposed to a position in which the sleeve projects a substantial distance beyond such end, said sleeve loosely encompassing said barrel leaving an annular passage between the sleeve and barrel which passage is open at one end to the atmosphere and at the other end to said furnace and through which passage a flow of air is induced for cooling purposes, and heat radiating fins within said passage and serving to space the sleeve from the barrel and to slidably support it therefrom.

2. In combination, a burner barrel constituting a conductor for an atomizing medium and the outlet end of which is adapted to be exposed to the heat of a furnace, a fuel conductor the outlet end of which is mounted in said end of the barrel, means for protecting said end and outlets from the heat of the furnace when required, said means comprising a sleeve telescoped over the burner barrel for quick movement in the direction of the axis thereof from a normal retracted position in which the outlet end of the barrel is exposed to a position in which the sleeve projects a substantial distance beyond such end, said sleeve loosely encompassing said barrel leaving an annular passage between the sleeve and barrel which passage is open at one end to the atmosphere and at the other end to said furnace and through which passage a flow of air is induced for cooling purposes, and a plurality of heat radiating fins in said passage some of which are connected to the sleeve and some to the barrel.

3. In combination, a burner barrel constituting a conductor for an atomizing medium and the outlet end of which is adapted to be exposed to the heat of a furnace, a fuel conductor the outlet end of which is mounted in said end of the barrel, means for protecting said end and outlets from the heat of the furnace when required, said means comprising a sleeve telescoped over the burner barrel for quick movement in the direction of the axis thereof from a normal retracted position in which the outlet end of the barrel is exposed to a position in which the sleeve projects a substantial distance beyond said end, said sleeve loosely encompassing said barrel leaving an annular passage between the sleeve and barrel which passage is open at one end to the atinosphere and at the other end to said furnace and through which passage a flow of air is induced for cooling purposes, and a plurality of heat radiating fins in said passage some of which are connected to the sleeve and some to the barrel and some of which serve to space the sleeve from the barrel and slidably support it therefrom.

HANNIBAL A. KUNITZ.

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