US1871952A

US1871952A - Oil burning apparatus

Info

Publication number: US1871952A
Application number: US488610A
Authority: US
Inventors: Lee S Chadwick; Resek Marc; Dahlstrom John Alger
Original assignee: Perfection Stove Co
Current assignee: Perfection Stove Co
Priority date: 1929-07-27
Filing date: 1930-10-14
Publication date: 1932-08-16
Anticipated expiration: 1949-08-16

Description

Aug. 16, 1932. s. CHADWICK ET AL OIL BURNING APPARATUS Original Filed July 27, 1929 2 Sheets-Sheet INVENTORS km H-wu M A TTU/CA'EXJ 1932- s. CHADWICK ET AL 1,871,952

OIL BURNING APPARATUS Original Filed July 21 1929 2 Sheets-Sheet 2 4 M, M A A fro/m5 VJ Patented Au 16, 1932 UNITED STATES PATENT OFFICE LEE S. CHAD'W'ICK, OF SHAKER HEIGHTS, MARC RESEK, OF CLEVELAND HEIGHTS, AND

- JOHN ALGER DAHLSTROM, OF BAY VILLAGE, OHIO, ASSIGNORS 'IO PERFECTION STOVE COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO OIL BURNING APPARATUS Original application filed July 27, 1929, Serial No. 381,600. Divided and this application 1930. Serial No. 488,610.

This invention relates to oil burners of the kind that are intended for use principally with furnaces of standard type, the same being designed to be placed within the lower portion or ash pit of the furnace in operative relation to the firebox or combustion chamber thereabove.

The present application is a division of one filed by us on July 27, 1929, Serial No. 381,600.

The primary purpose of this invention is to provide an oil burner that is especially quick and convenient of installation, it being unnecessary with our improved burner to close any opening or space that is left between the hearth of the burner and the wall of the furnace, inasmuch as the lower portion of the furnace below the hearth is closed to the admission of superfluous or excess air by a proper emplacement of the burner, the air necessary for the, promotion of combustion entering through a part of the burner structure. V

In line with the foregoing are the further objects of providing simple and easilypperated means for regulating the air supply to the burner, and the designing of the burner so that the air admitted for combustion purposes is utilized to prevent overheating of the parts of the apparatus, especially the motor. I. v

The. foregoing objects are attained in the embodiment of the invention illustrated in the accompanying drawings wherein Fig. 1 is a central vertical section from front to rear through our improved oil burning apparatus and the adjacent part of the furnace in which it is installed, the motor and certain of the burner parts being shown in elevation, and Fig. 2 is a horizontal section on the line 2-2 of Fig. 1, looking up, as indicated by the arrows associated with said line.

The furnace, the lower portion of which is shown in Fig. 1, is designated generally by the reference numeral 1, and the same is of standard type and construction, and access is had to the ash pit 2 thereof through the usual opening 3. The bottom of the ash pit is shown as formed by the floor A, and above filed October 14,

the ash pit is the firebox or combustion chamber designated 4.

Our improved burner consists of three major parts which may be referred to, gen erally, as the lower or bottom unit assembly 5, the upper or top unit assembly 6, and the hearth 7. The structure comprising these three major parts is supported a suitable distance above the floor A by legs 8, preferablythree in number, with the hearth 7 disposed in the lower portion of the firebox or combustion chamber 4.

The lower unit assembly is made up of a circular bottom wall 9, a cylindrical wall 10, and an annular top wall 11. The bottom Wall is dished throughout its central portion, as shown at 12, and is surrounded by a flange 13, while the top Wall 11 is formed with a peripheral flange 14. The top and bottom edges of the cylindrical wall 10 are spot welded or otherwise secured to the flanges of the respective walls 11 and, 9. For convenience of assembly, of the cylindrical wall 10 is made removable, as best disclosed in Fig. 2, said portion being designated 15, and shown as held in place by thumb screws 16. tioned legs 8 are preferably threaded through thimbles 17 whose upper ends are reduced and riveted within openings in the bottom' wall 9. By' reason of this construction, the legs 8 are adjustable with respect to-the structure so that the latter may be made level notwithstanding any irregularities in the floor A. i

The inner end of an air supply conduit 18, shown as formed of telescoping sleeves, is fitted through an opening in the front portion of the cylindrical wall 10 of the bottom unit assembly 5, the forward end of said conduit projecting through a collar 19 that is applied to aplate 20 over'an opening 21 therein, and which plate closes the ash pit opening 3 of the furnace. From this it is evident that air can enter the lower portion of the furnace only by way of the air supply conduit 18. An air control damper 22 is adjustably connected to the front of the air supply conduit 18, as by means of slotted tongues 23 through which bolts 24 are engaged, said the front portion The previously menbolts extending through apertures in the outer sleeve of the conduit 18 (and the upper one through a hole in a bracket 25) beyond which they are provided with wing nuts 26. The bracket 25 is in the form of-an angle whose inner branch bears against the collar 19 and, therewith, is connected to the plate 20 by a screw 27 The inner end of the air supply conduit engages a stop 28 that is fastened to the removable portion 15 of the wall 10. A cylindrical wire screen 29 is connected to, and is adjustable with, the air control damper 22 and extends into the conduit 18 for preventing the entrance of large pieces of foreign matter with the air.

The top unit assembly 6 includes a panlike housing whose body portion is drawn from. sheet metal'to form a bottom 30 and a side wall 31. The upper edge of said side wall is flanged outwardly at 32, and suitably secured thereto is the periphery of a top'33, the central portion of which is offset upwardly to form a cylindrical extension 34. Said extension has formed integral with it an annular wall that surrounds an opening 36.

The hearth proper is made of suitable refractory material, such as fireclay or brick, preferably in sections, (although to prevent confusion of lines it is not so illustrated in the drawings) and the same includes a rim 38 that rises from the edge of a flat bottom wall 39, and this refractory body is contained within a sheet metal hearth receptacle 40 that is supported by the top 33 of the upper unit assembly 6. The hearth receptacle is shown as secured to said top 33 by screws 41 whose heads are accommodated by a cavity in the bottom wall 39 of the hearth.

Suspended by bolts 45 from the annular top wall 11 of the lower unit assembly 1 is an electric motor 46. Situated centrally within the upper unit assembly 6, and secured to the bottom 30 thereof, is a reservoir 47 to which fuel oil is conducted through a pipe 48 from any suitable source.' It may be explained that the shaft of the motor 46 extends vertically through the reservoir 47 and supports thereabove a fuel atomizer 49, provided about its exterior, above the opening 36, with fan blades 50.

Current is supplied to the motor 46 through suitable conductors (not shown) and when said motor is energized it whirls the atomizer 49, the direction of rotation being from right to left as the parts are viewed in Fig. 1. By reason of the nature and design of the atomizer and the oil reservoir 47, a detailed description of which will be found in the parent application above identified, oil is caused to travel upwardly by centrifugal action from the reservoir and through the atomizer and is hurled from the discharge lip thereof, which is immediately above the fan blades 50, outwardly in a spray attainment of the first advantage.

or sheet over the bottom wall 39 of the hearth toward the rim 38 thereof. At the same time, due to the action of the fan blades 50, air is drawn in through the supply conduit 18, upwardly through the interior of the bot tom unit assembly about the motor 46, through the holes 56 (a part of the air passng through the holes 57 and a passageway which leads upwardly through the fuel reservoir and the atomizer to supply the primary air to the flame). The air admitted to the top unit assembly 6 through the relatively large openings 56 passes out by way of the central opening 36 in the upwardly extended portion of the top 33. This entraining of the air about the burner parts has the two advantages: first, of maintaining the burner parts relatively cool; and, secondly, of preheating the air so thatit will have a vaporizing effect upon the fuel oil, the preheating of the air resulting, of course, from the air absorbing heat from the burner parts in the Immediately after the motor is started and the oil and air are hurled outwardly into the confines of the hearth, the combustible mixture is ignited by the pilot burner 60 and is defiected upwardly by the hearth rim 38.

The air supply may be varied in order to obtain the most efiicient mixture and a satisfactory fiame by the adjustment of the air control damper 20, in the manner hereinbefore described.

By restricting the air supply to that entering through the conduit 18, it is unnecessary to close off the space between the rim of the hearth and the surrounding wall of the furnace, thus greatly simplifying the installation of the burner and making it possible to conveniently use one size burner with furnaces having combustion chambers of diiferent diameters and horizontal cross-sectional shapes. The facility of installation will be more fully appreciated when it is remembered that access to the space between the rim of the hearth and the surrounding wall of th combustion chamber is very difficult after the oil burning apparatus is emplaced.

Having thus described our invention, what we claim is:

1. In combination, a furnace enclosing'a combustion chamber, and an electric motor driven oil burning a paratus situated in the furnace below said c amber, the portion of the furnace below the combustion chamber through said passage,

combustion chamber, and a motor driven oil through said passage, and means for controlburning apparatus situated in the furnace be- 1i low said chamber, the portion of the furnace n the flow of air therethrough.

fn testimony whereof, we hereunto afiix below the combustion chamber having an air our signatures.

admitting opening and being otherwise a proximately air tight so that all air for tl ie promotion of combustion is admitted through said opening, the apparatus enclosing a passage registering with said opening for delivering all air entering therethrough to the zone of combustion, the motor of the apparatus being situated within the passage in close proximity to said zone, and means for controlling the flow of air through said passage.

3. In combination, a furnace enclosing a combustion chamber, a motor driven oil burning apparatus in the furnace below said chamber, said apparatus having an air passage and incorporating a hearth, the motor of the apparatus being situated in said passage in close proximity to said hearth, the portion of the furnace below the hearth be-' ing approximately air tight so that all air for the promotion of combustion is admitted and means adjacent the inlet end of said passage for controlling the flow of air therethrough.

4. In combination, a furnace enclosing a combustion chamber and an ash pit therebelow, said ash pit having a door opening and being otherwise closed excepting for its communication with the combustion chamber, and an electric motor driven oil burning apparatus situated in the ash pit, the apparatus having an air passage registering with said door opening and incorporating a hearth whose periphery is spaced from the surrounding wall of the furnace, the motor of the apparatus being situated in said passage in close proximity to said hearth, all air for the promotion of combustion being admitted through said passage.

5. In combination, a furnace enclosing a combustion chamber, and oil burning apparatus in the furnace below said chamber, said apparatus having an air passage and incorporating an electric motor for operating it that is situated in said passage in close proximity to the zone of combustion, the portion of the furnace occupied by said apparatus being approximately air tight so.

that all air for the promotion of combustion is admitted through said passage.

6.- In combination, a furnace enclosinga combustion chamber, motor driven oil burning apparatus in the furnace below said chamber, said apparatus having an air passage and incorporating a hearth, the motor of the apparatus being situated in said passage in close proximity to said hearth, the portion of the furnace below the hearth being approximately air tight so that all air for the promotion of combustion is admitted LEE S. CHA-DWICK. MARC RESEK. JOHN ALGER DAHLSTROM.