US2360924A - Oil burning apparatus - Google Patents

Description

1944- E. R. WOLFERT ET AL O'IL BURNING APPARATUS Filed Sept. 18, 1941 3 Sheets-Sheet l I m2 0... TP 1. W0 m R D m w or E WITNESSES:

WALLACE. E2. LYMAN.

ATTORNE I Oct. 24, 1944.

E. R. WOLFERT Em 2,3

OIL BURNING APPARATUS Filed Sept. 18, 1941 '5 Sheets-Sheet 2 5 l; 1 I I F.

:ii 1 INVENTORS [I :42 Epwmzo R.W0LFEFT, l ,i WAIEYLRCE RLYMAN. I l I a ATTORNEY 1944. E. R. WOLFERT ET AL 2,360,924

' OIL BURNING APPARATUS Filed Spt. 18. 1941 s Sheets-Sheet s WITNESSES: F1 G.- 5. I INVENTORS EDWARD F2. WOLFERT WALLRYCE F?. LYMRN.

ATTQRNE Patented Oct. 24, 1944 FFICE on. BURNING APP RATUS Edward R. Wolfert, Springfield, and Wallace K. Lyman, Chioopee. Falls, Mass, assignors to Westinghouse Electric 8;: Manufacturing Oom- 7 pany, East Pittsburgh, Pa., a corporation of Pennsylvania 7 Application September 18, 1941, SJrlal No. 411,308 g i (Cl, 103-4) 8'Claims.

This invention relates to oil-burning apparatus and more particularly to oil-burning apparatus of the pressure-atomization type.

An object of this-invention is to provide improved oil-burning apparatus of this type. Another object is to provide oil-burningapparatus of this type'having an improved arrangement of fuel-supply unit, motor,-and fan.

-- A still further object is to provide an oil burner of this type having an improved fuel supply unit. A still further object is to provide an oil burner of this type thatis economicalto manufacture and pleasing to the eye.

These and other objects are eilected by this invention as will be apparent from the following description and claims taken'in connection with the accompanying drawings, forming a part of this application, in which: i a

Fig. 1 is a longitudinal section of the oil-burning apparatus; v Fig.2 is a longitudinal fragmentary section of the fuel supply unit and motor;

Fig. 3 is a fragmentary transverse section taken;

approximately on the line III-III of Fig. 2;

4 is a section taken 'on line IV'-IV of Fig. 3; :;Fig.= 5 isia top casing; and,

. Fig. 6 is a fragmentary view showing the trans former mounting.

Referring to the accompanying drawings in which like numerals refer to like parts'throughout the several views, the oil-burning apparatus shown includesa casing II) having a'fan 'cham-" ber :II and-a plenum chamber-I2 provided bye front wall I3 and alien wall I4which are spaced" byra continuous connecting wall I5. "The fan chamber II and the plenum chamber I2 are'separated by acommon wall I6. from the fan chamber to the through an openingfin thef-wall I is provided with an an outlet wall' I3 through which air is discharged from the plenum chamber I2. A blast tube'l9 is secured to the. front wall I3 of-the plen axial with the air outlet I8. This blast'tube is provided at its discharge end with an air diifuser 2| having inclined vanes 22.- When installed, the

- Air is delivered I6. The casing discharge end of the blast'tube extendsinto the fire box of a furnace.

The oil burner is supported one base 23 connected to the continuous wall I of'the casing I0 bya standard 24'. I

Secured to the rear wall I4 ,0! the casing I0 and in line with the blast'tube I 9 is an ignition transformer 21 having an electrical connection with a plenum chamber I 8 in' its front chamber copair of conductors". The conductors 28 make connection with a pair of ignition electrodes 29 which extend longitudinally with respect to the axis -'ef the blasttube. Theignition electrodes 29 are provided with insulator 30. An oil-supply conduit 32 is positioned longitudinally in the blast tube I9 by means of a standard 33 which extends throughan elongated slot 34 in the bottom of the blast tube I9 and is held in position by a nut 35.

plan view of the fuel supply unit:

The oil supply conduit has an oil atomizing nozzle,

31- at one end and has its other end connected to a flexible oil tube 38 which is connected to the outlet of a fuel-supply unit. The ignition electrodes 29 are supported and held in proper position'relative to each other and to the nozzle13'l by means of a clamp 39 which engages. theinsulators 30 and the fuel-supply conduit 32. The assembly including the ignition electrodes 29 and the4atomizing nozzle 31 dinally within the nozzle so as to properly adjust the assembly with respect to the end'of the blast tube I9 by'loosening the nut 35 and sliding the standard inthe elongated slot 34. Y s

The transformer 21 is hingedto the rear wall ll of the casing coaxial with an opening 40, Fig, 6, therein, which is also coaxial with the blast tube I9; When the transformer is properly assembled for operation, it is held in position by hinges and a bolt ll on which a wing nut is threaded. This arrangement permits the assembly, including the electrodes 29 and the nozzle 31 I9 through the opening 40.

son a single shaft 68 which installed as a unit on Secured to -the rear'wall of thecasing III- is a sub-assembly '41. This sub-assembly includes a motor 41, a fuel 'supply unit '52, and a" fan 42. The elements of the sub-assembly are mounted hearings in thej'uel supply unit 52.

Themotor 41 includes a stator 43 and a rotor 49. The stator is pressed into a casing 46 which isattached to the casing I0 by'bolts 4,5. The

stator 48 is connected to a'suitable source of power by means of conductors 43. v

The fan "is fastened to the shaft 68 with 'a set screw I29. It will'be noted that an opening III] is provided in'the rear wall of the casing III which is larger than the fan 42. This permits the sub-assembly .to be assembled separately and g the casing III by insertin the fan 42 throdgh'the opening 0 and bolting the motor housing as to the casing III with the bolts-45, This also permitseasy removal of the 7 complete sub-assembly from the casing III for repairs;

may be shifted longitu- A is 'journaled in spaced rhesus-assembly 44 is above the blast tube I9 and extends from the casing i6 in th e pp 0site direction from the direction of extent of the blasttube aid in the same vertical plane with the blast -tube.. This arrangement of the sub-assembly and the blast tube llassists in symmetrically distributing the mass of the completed burner about the casing'll and alsopermits thesub-assembly to beremoved from the casing I6 for re pairs without disturbing the installation of the discharge end of the'blast tube I9 in the furnace. This arrangement also gives the completed burner a streamlined appearance which is pleasing tothe eye. I V,

The fuel supplylunit 52 includes a casing 63 which has a hub 54 extending therefrom which projects through an opening 66 in the motor casing and extends thereinto. This fuel supply unit is detachably connected to the. motor casing 46 by bolts i which extend through holes in a flange 3I on the casing 63 and engage screw threaded holes inthe motorcasing 46. The shaft 66 is journaledin the casing 63 and is supported by the spaced bearings III and H2. The bearing III is carried by the hub 54 andis positioned inside the motor casing 46. Thefan 42and.the'

rotor permits the use of a shorter, less flexible. shaft than otherwise and the hub of the rotor adds rigidity to the assembly. and assists in resisting bending and whipping of the shaft. This arrangement of the rotoralso centralizes most of the overhung weight near the bearing III. Heretofore, in burners having a horizontally disposed motor, two separate shafts and two separate sets of bearings have been used, that is. a motor shaft and a set of bearings to support it, and a pump shaft and a set of bearings to support it. Such an arrangement usually required a flexible coupling to connect the motorshaft and the pump shaft. ,The presentinvention eliminates the necessity of having two sets .of bearings by supporting the entire weight. of the motor, the fuel supply unit, and the fan on the bearings of the fuel supply unit, which arrangement also eliminates the necessity of using a flexible coupling between the motor and the fuel supply unit. 1

g The opening 66 in the motor casing 46 is larger :in diameter than the rotor 49 to permit the rotor to be withdrawn through the opening. This permits the fuel supply unit 52 and therotor 49 to be removed as a unit for servicing merely by loosening the set screw I29 so that the fan 42 maybe removed from the shaft wta-emoving the screws 5i, and disconnecting-the fuel line 36, without disturbing the mounting of themotor casing 46 and without disturbing the electrical connections of the stator 46. The casing 53 of the fuel supply unit has a shoulder 36 thereon that issubstantially as' long as the walls of the 1 motor casing 46 are thick. This shoulder 36 serves to centertherotor in thestator 48 when the fuel supply unit is installed on the motor casing 45. V

Oil pumping means indicated generally by the reference numeral 66 and an oil pressure regulating valve indicated generallyby the reference numeral 51 are mounted on the casing 63. A filter 56 for filtering the oil before it enters the oil pumping means 66 is attached to a shoulder 69 on the casing 66 by means of a resilient ring 6|. A complementing cap 62 which provides a chamber 63 is attached to the casing 53 by bolts 5 64. This cap encloses the oil pumping means 66 *and the filter", and it may be readily removed for servicing the oil pump or to clean the filter.

The oil pumping means includes a pair of intermeshing helical gears 66 and 61. The sear e: is mounted on and is driven by the shaft 66. The gear 61 idles on a stub shaft 66. The gears 66- and 61 are enclosed in a close-fitting housing which includes a plate 16 and a cover 13. The plate 16'has' apertures 1| and 12 formed therein in such manner that the clearance between the walls of the apertures and the ends-of the ear teeth is very small. The plate 16 and the cover- 13 are attached to the casing 53 by bolts 14 which enter threaded apertures-16 in the casing 63.

20 The oil pressure regulating valve 61 includes a borev 66 which is provided with an oil inlet 6|, a burner connection 62, and a by-pass outlet 63. Fitted within the bore 66 is a sleeve 64, and slidable in this sleeve is a piston 66. One end-of the piston-66 confines one end of a compression spring. This spring is provided at its other end with a pressure plate 69. The pressure on the spring 66 may be adjusted by means of a screw 93 which is threaded through a closure member 92 and has one end bearing against the pressure plate 69; A cap 94 completely encloses the screw to prevent accidentalturning of the same and also to prevent any accidental leakage of oil from the valve.

36' The piston 66 is provided with a central passageway 96 extending through the same,-and one of its ends forms a bypass port 91 into which fits one end 96 of aneedle valve 99.

One end of the bore 66 is fitted with a screw- 46 threaded ferrule I6I which is provided with a j port I62 forreceiving the other end I63 of the needle valve 99. This ferrule has-a nut I64 screwed into one end, thereby providing a sham ber I65 for the operation of the valve 69.. i

Th.valve as has a sliding in through the nut I64 and is provided with a collar I66 against which one end of a spiralspring I61 bears, while the other end of said spring rests against an end wall of said chamber. The ferrule is provided 60 with openings I66 for establishing communication with the bore 66. v V

The hub 54 of the casing 53 iscounterbored as indicated at H3 to provide space for a shaft seal, indicated generally by the reference numeral H4, to prevent oil that leaks down. the

shaft 68 from escaping from the end of the-same.

The seal H4 includes a ring I I5, which is fastened to the shaft 68 with a pin H6 and rings H1 and H8 which are connected in a fluid-tight manner by an expansible bellows H9. The ring H6 is held tightly against the end of the hubv 54by a nut I26 which is screw-threaded on the end of the hub. The ring H1 is held tightly. in 7 contact with the ring H5 by a compression spring 55 HI inside the bellows. This spring has one end abutting against the nut I26 and its otherv end abutting againstthe ring H1. The contacting surfaces of'the' rings H5 and H1 are finished smooth to prevent'oil from leaking between the 70 same.

The bearings III andJHZ are lubricated by oil that flows down the shaft 66 from the oil pumping means 56. Oil in excess of that required'to lubricate the bearings collects in the space around the ring H6 and it is drained away flows through a passage I43 in the casing 59 and, into the space between the meshing helical teeth on the gears" and 51. The gears rotate in the direction of the arrows, Fig. 5, and the oil is forced by the rotating gears into a substantially longitudinal horizontal passage I44, a substantially transverse horizontal passage I45, a subtion with the drawings, it will be seen that this invention provides an oil burner of the pressureatomization type having an improved fuel supply unit, and an improved arrangement of fuel supply unit, motor and fan.

While we have shown our invention in but one.

form it will be obvious to those skilled in the art that it is not so limited, butis susceptible of various other changes and modifications without departing from the spirit thereof, and we desire,

therefore, that only such limitations shall be placed thereupon as are specifically set forth in the appended claims. .What we claim is: v 1.,In an oil burner, a motor casing enclosing a stator and a rotor of an electric motor, a pump stantially vertical passage I49, and into the bore 80 of the oil pressure regulating valve 51. when.

the oil pressure in the bore 90 attains a-pressure approximately equal to 80 pounds to the square inch, whichis sumcient pressure to overcome the compression of the spring 99, the action of such pressure 'raisesthe piston 99 andthereupon the spring I01 will raise the needle valve 99 so that the end I03-which is m thebumer port I02 will,

be raised, thereby. P rmitting the oil to flow through the openings I05, the port I02, burner connection 82, 011 line 99, and to the burner nozzle 91.

The other-end 99 of the valve 99 will remain in the by-pass port 91 until the pressure rises to approximately 100 pounds to the square inch. At this time, the collar I09 has come in contact with the nut I04 and is prevented from rising further while the piston 96 continues to move,

- 'the weight of the rotor acts thereby withdrawing the end 99 of the valve 99 and permitting oil to flow through the passageway 98 and out through the by-pass outlet 93 which connects to a vertical passage I50 in the casing 53.

The oil burner disclosed herein may. be installed in either a two-pipe system or a singlepipe system. Accordingly. if the burner is installed in a single-pipe system a plug I5I is placed in the lower end of the passage I50-and the bypassed oil passes through a passage I52, whichopens into the passage I50 near-the top of the same, and returns to the chamber 69. If the burner is installed in atwo-pipe system, the,plug I5I is removed from the lower end of the passage I50 and placed in the passage I52, and a pipe is connected to the pwsage I50 to conduct the bypassed oil back to the storage tank.

The casing I0 has an opening I90 in the front wall I3, which is coaxial with the opening I III in the rear wall I4, through which combustion supporting air is drawn into the fan chamber by the fan 42.- This air is forced down intothe plenum chamber I2 and through the blast tube I9. Inv

order to regulate the amount of air delivered to the blast tube, an air regulator I9I is provided in the plenum chamber I2. A handle'l3'2 is provided for adjusting the regulator. The sub-assembly 44 is enclosed by a streamlined cover I54 which is held in position by a screw I55 which engages a threaded aperture in the cap 52. a i,

It should be noted that all of the passageways in the casing 59. are straight and they may be drilled from the outside of the casing. This facilitates manufacturing in that it is not neces sary to mold any of the passageways. The casing 53 may becast as a solid element and all the necessary passageways drilled therein later.

From the above description, taken in connec-' casing attached to said motor casing, bearings carried by said pump casing, one of said bearings being located within said motor casing, a horizon- I tally disposed shaft carried by said bearings, and

a pump element disposed in said pump casing and driven by said shaft said rotor being; attached to said shaft so as to rotate therewith, said rotor having a recess therein into which the bearing located inside the motor casing extends so that on saidshaft closely adjacent said bearing.

2. In an oil burner, a motor casing having a. stator positioned therein, a pump casing having a pair of spaced bearings therein, one of said bearings being located in said motor casing, a shaft joumaled in said bearings, a pump element disposed in said pump casing and rotatable with said shaft, a motor rotor mounted on said shaft I and supported on said bearings, said rotor being positioned closely adjacent the bearing that is located in the motoncasing, and means detach-,

ably fastening said pump casing 'to the motor casing and positioning the rotor in proper relation to the stator.

3. In an oil burner. a motor casing having a stator positioned therein, a pump casing having a hub extending into said motor casing, a shaft journaled in said hub, said hub having a recess therein, a shaft seal positioned in said recess, a pump element disposed insaid pump casing and rotatable with said shaft, a bearing for said shaft positionedin said hub closely adjacent said shaft seal, a motor rotor mounted on said shaft and rotatable therewith, said rotor having a recess therein into which said shaft seal and a portion of said bearing adjacent the same project so that the rotor encompasses said shaft seal and said portion of the bearing, and means detachably sub-assemblybeing attached toand-supported by said fan chamber and extending substantially horizontally therefrom, said fuel supply unit having a shaft extending therefrom and bearings for said shaft, said fan and the rotor of said motor being mounted on said shaft and thereby supported on the bearings of said fuel supply unit. there being an opening in the sidewall of said fan chamber adjacent said sub-assembly large enough to. permit withdrawal therethrough of said fan, upon removal of said sub-assembly.

without disconnecting said fan from said shaft.

5. In an oil burner,'a fan chamber, a subassembly including a fuel supply unit having a shaft extending therefrom, a motor, and a fan disposed in said fan chamberpsaid sub-assembly being attached to and-supported by said fan chamber and extending substantially horizontally therefrom, bearings for said shaft, said fan and the rotor of said motor being attached to said shaft and thereby supported on the bearings'of said fuel supply unit, said rotor being-recessed over a portion of said fuel supply unit, there being an opening in the side of said fan chamber adjacent said sub-assembly large enough to permit withdrawal therethrough of said fan, upon removal of said sub-assembly, without disconnecting said fan from said shaft.

6. In an oil burner, a fan chamber, a fan therein. a motor casing connected to said fan chamber, a stator and arotor positioned in said motor casing, said motor casing having an open-' ing therein large enough to permit saidrotor to pass therethrough, a pump including a casing, a pump elementtherein, and a shaft'that extends fromthe casing and projects into said motor casing,- said rotor being-carriedon said shaft; means for detachably securing said pump casing to-said motor casing so that the pump casing closes-said opening in said motor casing, said 25 rotor being removable from said motor casing ing therein'large enough to permit said rotor to pass therethrough, a fuel pump removably at-'- tached'to said motor casing andhaving a shaft that extends through said opening and projects into said motor casing,saidrotor and said fan being carried on said shaft, said rotor'being re-' movable "from said motor casing through said opening, whereby said pump and rotor may be removed from said motor casing as a unit without removing said motor casing from the fan chamber,- there being an opening in the side of said fan chamber adjacent said sub-assembly large enough to'permit withdrawal therethro'u'gh of said fan; upon removal of said sub-assembly, without disconnecting saidfain from said shaft;

8. In an oil burner, a fan chamber, a motor in said motor casing, a pump including a casing adapted to be attached to saidmotor casing, a pump element in said pump casing and a shaft extending from said pump casing and projecting into said motor casing, a rotor connected to said shaft, said rotor being insertable into said motor casing through said opening therein, means automatically lining up said shaft with said motor casing when said pump casing is placed in position thereagainst so that said rotor will be in proper position relative to said stator, and means detachably securing said pump casing to said motor casing. 1

' EDWARD R. WOLFERT;

WALLACE R. LYMAN.

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