US2742894A - Oil burning heater for tobacco barns - Google Patents

Description

April 24, 1956 LOVE ET AL 2,742,894

OIL BURNING HEATER FOR TOBACCO BARNS Filed April 28, 1955 2 Sheets-Sheet l INVENTORS z/asqv/rfl [are @W Marl/e15- i. [are ATTORNEYS April 24, 1956 J LOVE ETAL 2,742,894

OIL BURNING HEATER FOR TOBACCO BARNS Filed April 28, 1953 2 Sheets-Sheet 2 l NVE N TOR3 Jase [36. law "W fiadezs 6.10m

ATTORNEYS g V 2,742,894 on. BURNING HEATER non TOBACCO. BARNS JosephCabel L'oveandi Chalmers Glenn Love, Kenbridge, vs.

Application April zs, I1953,-=Serial No. 351,534 2 Claims. cl; 126 9;3)

This invention relates to an oil 'burningheater, particularly designed for heatingtobacco barns in. the .flue curingof'tobacco, although obviously it is applicable mother uses:

One of'the objects of the invention is to provide a heater of the type indicated, equipped witha door, the opening of which releases the movable parts of the heater Uni d States Parent- 2,742,894 7 Pateiited. Apr. .24, 1956 the casing are joined together. The- flanges 7 and 8, as

shown, terminate a short distance-from the front of the said "upper part is closed at the front by means of a semi circular door 15, having a semicircumferential channel 16 at its rear, which freely hooks over the flange 14. The door has a forwardly projecting handle .17 and is removed ,by grasping the handle and raising the door vertically so as to clear the flange 14.

p The lower part 18 of the casing'is provided withan integral semicircular front end 19 which. is in the same vertical plane as the door 15. Said door and the front end 19 are'formedwith matching semicircular recesses which from time to time require servicing, so thatthese partscan readily be removed without theuse of tools.

' Another object of theinvention is to provide an oil heater as described, in, which. the mouth of the main. air duct vertically overlies the oil distributor and vaporizor element of the burner, the inlet end. of said duct extending through the front of the heater outside ofthe barn, so that there is no back pressure as in the case where air is derivedfrom within a barnhaving inadequate openings to'atmosphere, resulting in improved combustion.

A further object of the invention is to providea massive burner. comprising a. bowl component and an oil dis tributor and vaporizor fitting said bowl component, there being means for providing an annular starting flame circumferentially of said burner in contact therewith in an intermediate zone, for heatingthe burner to change the liquid oil supplied thereto to vapor which'is burned at the periphery of the oil distributor and vaporizor and beneath themouth of the air intake duct.

Still: another object of .the invention is to provide an oil overflow at the forwardendof: the casinggof' the heater, and a dam across said casingmearwardlyyof'the burner, extending to a higher levelthan said overflow, to preventoverflowingoil from running into the conduit for the efliuent products of combustion where it would be 7 a definite fire hazard. 1

Other objects of the invention will appear as the following description of a preferred and practical embodiment thereof proceeds.

In the drawings which accompany and form a part of the following specification, and throughout the figures of which the same reference characters have been used to denote identical parts:

Figure 1 is a side elevation of an oil burning heater embodying the principles of the invention;

Figure 2 is a front end view; I

Figure 3 is a vertical longitudinal section through the heater, along the line 3-3 of Figure 2;

Figure 4 is an enlarged sectional view taken along the line 4-4 of Figure 3, viewed in the direction of the arrows; I

Figure 5 is a diametrical cross-section taken along the line 5-5 of Figure 3.

Referring now in detail to the several figures, the numeral 1 represents the cylindrical body or casingof the heater, which is horizontally disposed. Said casing is supported between the bifurcations 2 and 3 of front and rear supports 4 and 5, formingparts of the integral base 6.

The casing 1 is divided in a horizontal axial plane. Each half has the outwardly extending flanges 7 and 8 secured together by bolts 9, through which the halves of 20 and 21 which together form a circular hole 22. (see Figure 2). The meeting edges of the front end and door, including the periphery of the semicircular recesses 20 and 21 are faced by outwardlyextending strengthening flanges 23 and 24.' i

The lower .part 18 of the ca'singll is integrally formed with the massive bowl component 25'of the burner, which is formedwith a cylindrical oillpreheatingchamber 26, to which oil is supplied through the conduit"27.' Above thechamber 26 thebowl component 25is provided with ,an expanded'vaporizing chamber 28. Above said vaporizing chamber said bowl component is formed with a bowl of frusto-conical shape, the flared walls 3001f which form a seat for a. freely insertedoil distributor and vaporizor 31, having a series of circumferential grooves32 formed in its outer periphery, communicating with the vaporizing chamber 28 at one'end, and with the general chamber of the casing 1 at their. upper ends. The oil distributor and vaporizor has a centrallylo-cated upstanding tit 33, which as shown, is of square cross-section.

A ,capacious air inlet duct 34 of-elbow shape has its outer end 35passing through the hole22in the front of the casing, and is providedwithia cross bar 36 at its inner end,'having a central recess 37'ofcomplementary shape to the end of the'tit33, which receives the tit so that the weight of the air inlet duct holds the oil distributor and vaporizor in place and the oil distributor and vaporizor including the tit, allocates and secures the air inlet duct.

The conduit 27 extends between the front bifurcations 2 and 3 of the base, parallel to and in adjacency to the lower part 18 of the casing, so that when the latter becomes heated, heat is imparted to the conduit 27 by radiation as well as by conduction directly from the bowl component 25, so that the oil in the conduit 27 is preheated. In order for the oil to acquire as much heat as possible, the conduit 27 is of relatively large diameter so as to retard the velocity of the oil passing through said conduit. A smaller pipe 38 leading from an oil supply, not shown, and provided with a cut-off valve 39, is connected to the conduit 27.

The bowl component 25 is provided with a stepped annular lower portion 40, having a channel 41 in its upper face, containing an annular asbestos wick 42. The front end 19 of the lower part 18 of the casing is provided with an overflow pipe 43 as a somewhat lower level than the channel 41, said overflow pipe leading to a suitable sump, not shown, provided-with means, not shown, such as a float controlled pump, which returns the overflow from the sump to the oil supply. The front end 19 is also provided with a series of auxiliary air inlet openings 44, communicating with atmosphere. 1

The lower part 18 of the casing, at a point rearward of the burner, is provided with an' integral darn 45 extending thereacross, having a horizontal top edge which is at a higher level than the overflow pipe 43.

The operation of the heater is as follows. With the parts in the position shown in Figure 3, the cut-off valve 39 is opened and oil supplied to the burner which passes through the groove 32 of the oil distributor and vaporizor and flows into the channel 41, saturating the wick 42.

Any excess oil overflows into the bottom of the lower part of the casing 18, and is discharged through the overflow pipe 43. The burner is lit by removing the door 15 and applying a match to the asbestos wick 42. Presently the bowl component 25 becomes sufiiciently heated to vaporize the oil in the chamber 28 and grooves 32, the oil vapor being ignited by the lit asbestos wick. Air to support combustion is drawn in through the air inlet duct 34 and through the auxiliary air inlets 44. The down draft of air upon the top of the oil distributor and vaporizor spreads the flames out into the general chamber of the casing, producing intense and complete combustion. Since the air through the duct 34 is drawn from atmos phere outside the barn, it will not be subject to back pressure, as would be the case if it were drawn from the barn atmosphere, a more free flow of air being thus assured, with improved combustion. The dam 4S precludes the possibility of any of the overflow oil at time of starting entering the heat conduit 12 and thus producing a fire hazard within the barn.

It is frequently necessary to service the parts of oil heaters which are associated with the burner and air inlet passages, for the removal of soot. This is readily accomplished in the present construction without the use of tools. It is simply necessary to remove the door 15; then the air inlet duct 34 can be lifted from the oil distributor and vaporizor and removed through the door opening and the oil distributor and vaporizor can be lifted out by taking hold of the tit 33. When the parts are reassembled, the air inlet duct remains firmly in place, even when the door is removed, since it fits the recess 21 in the front end 19, and the interdigitating tit 33 and recess 37 form a sticking taper. In the servicing of the burner it is sometimes necessary to clear the interface between the oil distributor and vaporizor and the bowl compartment 25. This is done by rotating the oil distributor and vaporizor against its seat in the component 25, which is readily accomplished by grasping the square tit 33.

While we have in the above description disclosed a practical embodiment of the invention, it will be understood by those skilled in the art that the specific details of construction and arrangement of parts, as shown, are by way of example and not to be construed as limiting the scope of the invention.

What we claim is:

1. An oil burning heater comprising a casing constituting a horizontally extending combustion chamber, a clo sure at one end, the opposite end having an opening adapted for connection to a discharge flue, said closure being divided horizontally into upper and lower parts, the lower part being fixed and the upper part being a removable door, said door and said lower part being formed with the matching halves of a circular hole and with matching flanges bordering said hole extending outwardly therefrom, a burner within said casing comprising a body having a circular chamber with an upwardly flaring conical surrounding wall opening in the upper face of said body and being connected to a source of liquid fuel, a removable oil distributor and vaporizor having a peripheral seating wall of a shape complementary to said flared wall and seated upon said flared wall, an elbow shaped air duct freely mounted in said casing having a horizontal limb extending slidably between said matching flanges in gas tight engagement therewith, said air duct having a vertical limb overlying said oil distributor and vaporizor and having a cross bar at its inner end, said cross bar and oil distributor and vaporizor being formed with freely separable snugly interfitting means aligning said oil distributor and vaporizor coaxially with said vertical limb and supporting the latter, the horizontal limb of said air duct being supported by the fixed part of said closure and held in position by said door.

2. An oil burning heater as claimed in claim 1, said casing and door at the top being provided with freely interhooked flanges for detachably securing said door in closed position.

References Cited in the file of this patent UNITED STATES PATENTS 387,927 Smith Aug. 14, 1881 1,447,385 Hardinge Mar. 6, 1923 1,639,518 Long Aug. 16, 1927 1,679,633 Six Aug. 7, 1928 2,453,233 Kittrell Nov. 9, 1948 2,512,964 Peterson June 27, 1950 2,547,841 Strickland Apr. 3, 1951 2,547,842 Duncan Apr. 3, 1951 2,561,799 Johnson July 24, 1951 2,663,364 Dowless Dec. 22, 1953

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