US2473769A - Support means for oil pipes and electrodes in oil burners - Google Patents

Description

Patented June 21, 1949 SUPPORT MEANS FOR OIL PIPES AND ELECTRODES IN OIL BURNER/S Carl E. Schinman, Seattle, Wash.

Application September 16, 1946, Serial No. 697,218

2 Claims. 1

This invention relates to oil burners, and 1t has reference more particularly to improvements in oil burners of those types extensively used for domestic heating purposes, commonly referred to as electric oil burners and having an air blast tube through which air is forcibly delivered into a combustion chamber and an oil supply tube leading Within the blast tube to a nozzle located within or close to the discharge end oi the air blast tube, and from which nozzle the fuel oil is forcibly delivered in a finely atomized condition for mixing With the air as the mixture enters the combustion chamber.

It is the principal object of this invention to provide an improved means for the support adjustment of the oil delivery tube and the elec trodes Within the air blast tube of a burner of the above stated character. Furthermore, to provide a novel mounting or support for these parts that may be adjusted in an end wise direction thereon to locate it in the most desirable position, and may be easily and readily secured at any adjusted position.

It is also an object of the invention to provide a novel form of support for the oil delivery tube and electrodes that serves additionally as a means for spreading the air stream as delivered through the blast tube to the outlet and for imparting a spiral whirling action to the air stream as discharged from the tube end.

Yet another object of the invention resides in the provision of a supporting or mounting means for the oil supply pipe and electrode assembly for use in combination With the aforementioned support, and permitting an endvvise adjustment of the electrodes and nozzle assembly; this latter support being used to pass` the oil supply tube through the fan housing and to the interior of the v fully described.

En accomplishing the above mentioned and other objects of the invention, I have provided the improved details of construction, the preferred forms of which are illustrated in the accompanydrawings, Wherein-l ,4 Y l n Fig. 1 is a side View of an oil burner embodying which the motor` I4 is mounted. It is to be ex- Z. the improvements of the present invention therein; a part of the air blast tube being shown in longitudinal section for better understanding of parts contained Within it.

Fig. 2 is a horizontal section taken substantially on line 2-2 in Fig. 1.

Fig. 3 is an enlarged cross sectional vievv taken on line 3 3 in Fig. 1, showing the disposition of the tube and electrode support therein.

Fig. Llis a section taken on line 4-4 in Fig. 3, showing the electrode clamp and form of the support.

Fig. 5 is an enlarged, horizontal section taken .on the line 5-5 in Fig. 1, illustrating the inner end mounting for the oil supply pipe, permitting a limited endvvise adjustment of the electrode wand nozzle assembly in the blast tube.

Referring more in detail to the drawings- The burner with which the present improvements have been illustrated, comprises a sheet metal fan housing lll of involute form, opening at the top to a discharge throat Il' onto which an air blast tube l2 is secured ras a continuation of the throat. Attached to the housing, at opposits sides, are vertical plates |3-l3, serving as legs for the proper support of the burner.

suitably mounted on a side Wall of the fan housing, as seen in Fig, 1, is an electric motor Ell, and this has its drive shaft I4' extended directlf.y through the fan housing, as illustrated in 'Fig 2, and fixed on this shaft, Within the housing, is a fan it, here shown to be of the squirrel type, designed for a forcible discharge of air outwardly through the blast tube l2 for the purpose of aiding combustion of fuel, as is Well understood in'this art. In Fig. 2 of the drawing, it

is indicated that outside air is being admitted .to the ian housing lll vand to the inside of the vian through an opening l@ form-ed in that side Wall of the housing that is opposite the Wall on plained, however, that the present improvements l are not dependent upon the use of this particular type of fan or housing, and that the present ar- .rangement of housing,` motor and fan, are only illustrative of typical present-day burners.

Fuel oil is furnished under pressure to the burner through a supply line that is here shown as leading into thefan housingthrough aside Wall thereof at a point above the fan. The supply line f others and to the same degree.

comprises a pipe that is exterior of the burner, and a pipe 2| that is located within the burner and which has a part thereof extending coaxially of the blast tube to near its discharge end where it is equipped with a suitable type of oil atomizing nozzle 24. Oil is supplied through the connected pipes 20 and pipe 2| under pressure to the nozzle to effect its necessary atomization, and this pressure is usually maintained by a pump that is interposed in the supply line and which is operated by the motor which drives the fan; the pump for this purpose, and its connections not being shown in the present drawings.

Extending along opposite sides of the pipe 2| and slightly thereabove, are the electrodes 26-26 which at their outer ends, have terminal points 2'! directed toward each other and terminating forwardly of and somewhat above the nozzle. At their inner ends, the electrodesy are electrically connected by flexible leads, indicated .d

at 28, with a source of electricity; the connection being through a switch, not herein shown, that may be turned on or ofi automatically in: accordance with the operation of the burner, and

as required for the ignition of the fuel charge by the discharge of a spark between the terminals or points; 2l'.

One feature of.' the present invention resides in the provision of a novel form of support for the oil tube 2| and the electrodes within the air blast tube so that the assembly will be held properly located with respect to the outletv from the blast tube. This particular support is characterized by a construction that, in addition' to its supporting function',l serves additionally to cause the air stream to leave the' tube nozzle in a spiral, whirling blast that is very desirable from the standpoint of effecting a good fuel mixture.

The support which is designatedin its entirety by reference numeral S9, has been shown in Figs. 1 and 2` as being located in the blast tube about midway of, its length. However, for different burners or for diierent operating conditions, this support might be advantageously placed at another location. As shown in. Figs. 3 and 4, the support comprises a pair of circular, ysaucer-shaped disks :il-3|, each formed with a fla-t central portion', and a conically sloping peripheral or side wall portion. These disks are complements of each other and oppositely faced and placed with their peripheral edges in registration and engaged together, and they are .secured together in this relationship. In the present instance, I have shown the parts to be secured by the clin-ching of ears which extend from the edge of one part over the edge of the other, as shown in. Fig. 3. Another method or means of securing these parts would be by spot Welding at `engaged edges. As joined, the disks form a hollow, circular body, the shape of which is best understood by reference to Fig. 4.

Extending from the periphery of the hollow body form-ed by the two disks and at equally spaced angularI intervals thereabout. here shown to be 90, are supporting and centering wings 36, each of which is integral with one of the disks and is bent at an angle to the' axial line of the tube and. in the same direction asA the These wings are adapted to engage along their outer edges with the wall of the blast tube, thus to center the support in the'tube', and to define an annular passage` about it through which the air stream as delivered from the fan through the blast tube,

will flow with increased speed, and to the tube` end close to the tube wall and by reason of the angular disposition of the wings, will have a spiral whirling motion imparted thereto as the air stream passes to and through the discharge end oi the blast tube.

It is shown in Figs. l and 2 that the blast tube is equipped at its discharge end with a nozzle portion comprising a conically tapered end portion |22) defining a rather restricted outlet through which the air stream and atomized oil are discharged.

Formed centrally of each of the disks 3l which form the support 30, are openings 38 through which the oil pipe 2| extends with slight clearance, permitting easy adjustment of the support along the tube. Also formed' in the disks, above and at opposite sides of the center of the disks, are paired openings 39-39 through which the electrodes- 25 extend with clearance for easy adjustment of the support thereon. The support 35 is assembled with the pipe 2| and electrodes before the blast tube is applied to the fan housand after it has been located at a desired position thereon, it is then locked against movenient relative thereto. This locking is accomplished by means of a clamping mechanism comprising. at dat .plate ilu.' that is1 located within the hollow body 30 and underlies the two electrodes as shown in Fig. 3. A clamp screw fil is extended vertically within the support through a top opening 32 and is threaded through the plate 49, with its inner edge engaged against a metal protective sleeve 3 applied about that portion of the pipe 2| that is` contained between' the opposite sides of the support.

On tightening the screw, the plate 40 will be lifted, and its end portions will. engage and lift the electrodes upwardly and clamp them against the top edges of the openings 39' through which they pass and by this clamping pressure, will hold the electrodes, the pipel 2| and the support in a xed relationship.

After the above setting of' the support has been accomplished, then the blast tube l2 is slipped over the support and secured at its inner end to the discharge throat of the housing Il, as indicated in Fig. 2. It is here shown that the blast tube is telescoped over the throat a short distance and fastened thereon by screws 45.

After the blast -tube has been secured in place, it frequently happens that a iina'l adjustment of the nozzle from or toward the outlet of the blast tube is desirable. This is provided for in the present instance by a novel inner end mounting or" the oil delivery tube 2B.

As shown in Fig. 2, the pipe 2| has a lateral bend at its inner end that extends outwardly to adjacent the side wall of the fan housing. At the same level of this laterally turned end of the pipe 2|, the housing is formed with a horizontal slot 46 and overlying the slot, at the outside of the wall is a cover plate 4T which serves as a support for the oil pipe and also as an adjusting means for the: pipe and electrode assembly.

y In a preferred arrangement, the laterally .turned end of the pipe 2| is threaded onto a female fitting 5G' having a tubular shank 5| extended outwardly through theA horizontal slot 46 in the housing wall and through a hole in the cover plate 41 which fits closely about the shank. A shoulder 52 formed on the shank seats against the inside of the cover plate and a nut 53 is threaded onto the shank and is tightened against the plate at the outside, thus to secure the fitting rigidly in the plate so that the plate may serve as a mounting for the inner end of the pipe 2l. The oil pressure line 20 then is connected by means of a nipple 56 to the outer end of the shank of tting 50.

The cover plate 41 extends horizontally and substantially to opposite sides of the longitudinal slot in the housing and is formed at its opposite end portions with horizontal slots 58. Screws 59 are extended through these latter slots and threaded into the housing wall. When these screws are loosened, the plate 41 may be adjusted endwise, thus to shift the nozzle and electrode assembly toward and from the end of the blast tube to the extent permitted by the lengths of the slots 58 in the plate. When these screws are tightened, the adjustment will be secured.

With the parts so constructed, the electrode and oil pipe nozzle assembly will be definitely and adjustably supported in the blast tube. Easy adjustment of the assembly from outside the fan housing is possible and an effective and efcient structure is provided.

Having thus described my invention, what I claim as new therein and desire to secure by Letters Patent is:

1. In an oil burner having a blast tube, an oil delivery pipe extending centrally within the blast tube and a pair of electrodes parallel with the said pipe; a support for the pipe and electrodes comprising a pair of saucer-shaped disks of the same diameter but of a lesser diameter than the blast tube, faced in opposite directions and secured edge to edge to form a hollow circular body; said disks having central openings loosely receiving the pipe therein, wings extending from the periphery of at least one of said disks and engaging in a supporting contact with Walls of the blast tube to center the support in the tube; said disks having paired openings therethrough spaced from the axial line of the body and receiving said electrodes loosely therein for the slidable adjustment of the support longitudinally of the blast tube, and a clamp plate within thev support underlying the electrodes and overlying the oil pipe, and a set screw threaded through the plate and engaged against the pipe and adapted to be turned to force the electrodes and pipe against the edges of their respective containing openings to hold the support against movement.

2. A support as set forth in claim 1 wherein a sleeve is applied to the oil pipe within the supporting housing and said clamp screw engages at its inner end against said sleeve, and said housing having an opening through which the outer portion of the clamp screw extends.

CARL E. SCHINMAN.

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

UNITED STATES PATENTS Number Name Date 2,078,021 Rodler Apr. 20, 1937 2,310,274 Beckett Feb. 9, 1943 2,370,933 Bortner Mar. 6, 1945 2,405,196 Elliot et al. Aug. 6, 1946

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