US2606497A - Oil burner pumping unit - Google Patents

Description

Original Filed March 8, 1948 R. R. WITHERELL OIL BURNER PUMPING UNIT 4 Sheets-Sheet l g- 1952 R. R. WITHERELL 2,606,497

I OIL BURNER PUMPING UNIT Original Filed March 8, 1948 4 Sheets-Sheet 2 I IAINVENTOR. 72;? 2?; Wfz lkerall.

"Bygj Aug. 12, 1952 R. WITHERELL OIL BURNER PUMPING UNIT Original Filed March 8, 1948 4 Sheets-Sheet 5 IVINVENTOR. Faierz F, lflz'f/l axzll JJW g way 4 Sheets-Sh eet 4 x A I 43 R. R. WITHERELL OIL BURNER PUMPING UNIT Aug. 12, 1952 Original Filed March s, 1948 Patented Aug. 12, 1952 UNITED-STATES PATENT OFFICE Robert R. Witherell, Bloomington, Ill., assignor to Eureka Williams Corporation, Bloomington, 111., a corporation of Michigan Continuation of application Serial No. 13,718, March 8, 1948. This application October 4, :1951; Serial No.:2.49,727

. 1 This inventionrelates to a pumping unit for supplying fuel and air to oil burning apparatus and has particular relation to the construction and assembly of the various elements of saidunit within and upon a casing for such elements and the construction and assembly of the casing in cornbinaticnwith other unitsof such oil burning apparatus.

Some of the-objects of the invention are to provide: 7 v

A pumping unit for oil burning apparatus which consists of elements that areeasy to construct and to assemble within a single unit that can be attached to and made a part of the complete oil burning apparatus.

A pumping unit which issimple in construction and easy to adjust, to assemble, and to service.

A pumping unit which is quiet in operation and which will not give offobjectionable .oil fumes into the surrounding atmosphere.

A pumping unit in which novelmeans .is provided for assembling all of the elements of the unit within a pumping unit casing and for aligning the same with drive shaft means and other elements of the complete 011 burning apparatus.

A pumping unit in'which novel .air pump, fuel pump, and fuel metering pump constructions are employed.

Other and further objects of the invention will be apparent by reference .to the accompanying drawings of which there are four sheets, which, by way of illustration, show a preferred embodiment and the principles thereof and whatjI now consider to be the best mode in which .I have contemplated applying these principles. Other embodiments of the invention embodyingv the same or equivalent principles may be used and structural changes may be made as desired by those skilled in the art without departing from the present invention and the purview of the appended claims. I also contemplate that of the several different features of my invention, certain ones thereof may be advantageously employed in some'applications separate and apart from the remainder of the features.

Referring particularly to the drawings:

Fig. 1 illustrates a longitudinal sectional view with certain parts thereof in elevation of a .part of an oil burning apparatus, including therein a pumping unit embracing the principles of the invention.

Fig. 2 is a cross-sectional view through a portion ofthe structure illustrated by Fig. 1 adjacent the fuel pumpingmeans which is employed in the structure. Fig. 2 istaken-on line 2-2 of Fig. 1 looking in the direction of the arrows. v

Fig. 3 is another cross-sectional view" through the structure disclosed by Fig. 1 illustrating the 14 ,Claims. (Cl. 103-5) fuel pumpingmeans employed in such structure. Fig. .3 is taken substantially in the plane of line 3-3 of Fig. 1 looking in the direction of the arrows.

Fig. 4 is a cross-sectional view through the fuel metering means employed in the structure disclosed by Fig. 1. Fig. -4 is taken substantially in the plane of line 4-4 in Fig. flocking in the direction of the arrows. 1

Fig. 5 is a cross-sectional view through the structure disclosed by Fig. 1 and through one of the end plates for the air pumping means included therein. Fig. 5 is taken substantially on the plane of 5-5 on Fig. 1.

Fig. 6 is a cross-sectional view through the air pump structure employed in the pumping unit disclosed by Fig. 1. Fig. .6 is taken substantially in the plane of line .66 on Fig. 1.

Fig. 7 is another cross-sectional view through the other of the air pump end plates and the fuel cleaning compartment embraced in the pumping unit. Fig. '7 is takenysubstantially in the p e of e -1 lookingin the direction of the .arrows thereon.

Fig. 8 is a schematic illustration of certain parts of the oil burning apparatusin which the pumping, unit embracing the principles of this invention is employed.

Referring to Fig. 1, the numeral 10 indicates a portion of a motor compressor unit employed in the oil burning apparatus .with which the pumping unit indicated by the numeral H is adapted to be employed. The motor compressor unit It includes a shaft I2 which is adapted to be driven by an electric motor, not shown, and on which ismounted .a fan, not shown. The fan referred to supplies the main quantity of secondary supply of .air employed ,in the fuel burning apparatus. The motor compressor unit It! with which the pumping unit H is employed may be a motor compressor unit such as that disclosed incopending application Serial No. 772,970, filed September 9, 1947, for Motor Compressor Unit, rl ggii Patent No. 2,542,121, issued February .20,

The numeral 13 indicates an inlet .portion of the housing .for the fan employed in the motor compressor unit .10, the air supplying the fan being admitted through openings 14 which are formed within the housing [3 between circumferentialrings [6 extending about the housing. The air admitted through the openings l4 passes into the fanthrough a fan'inlet indicated by the numeral I]. v

The shaft i2 drives the pumping unit if through-a shaft-coupling [B in the opposite end of which a shaft l9 employed in the unit .H is secured. Theshaft I9 is securedin the coupling The bearing 2| is held in a 22 by a spring and cap structure indicated by' the numeral 23.

23 is held in position against the end of the end plate 22 by screws indicated at 24.

In order to properly center the bearing 2| and the shaft |9 with respect to the housing I3, there;

is provided within the housing |3 an axially disposed cylindrical opening indicated at 26. The opening 26 is adapted to receive the exterior surface 21 of the end plate'22 and to form a close sliding fit therewith in order to locate the plate 22 with'respect to'th'e end of the housing l3 and drive shaft |2 of'the oilburningapparatus I0. The housing |3 also is provided with an axially extending cylindrical flange 28 which'projects from the end of the" housing I3 in such a way that the end surface 'o'f-the flange isdisposed normal with respect to the axis of the cylindrical surface 26. The flange 28 is adapted to provide a seating surface against which the endof a similar cylindrical flange29 formed on ahousing 3| for the pumping unit is seated. The housing 3| is generally cylindrical in formation except for the projection'from the upper central portion thereof of a projection indicated-at 32 and within which a'chamber 33 is provided for a liquid fuel cleaning device 34.' Formed across the central portion of the'casing 3| and disposed in transverse relation 'to the axis thereof is a web or support indicated at'36 which is provided with a centrally disposed opening 3f! through which shaft |9projects.

Disposed on the side of the support 36 adjacent the apparatus I is a rotary vane compressor indicated generally at 38. The compressor 38 (see also Figs. 5,6, and 7) comprises an end cap 39, a compressor cylinder 4|, and the end cap 22 previously referred to. Within the cylinder'4l there is provided an eccentrically disposed pumping chamber 42 which is adapted to be engaged by the ends of blades or'vanes 43 which are disposed radially within slots 44 formed in a rotor 46 secured concentrically with respect to shaft l9. In order to provide for the axial movement of the shaft |9 with respect to the rotor 46,'the shaft I9 is provided with anarcuate depression indicated at 41 in which a ball 48 is adapted to be seated. Rotor 46 also is provided'with a plurality of axially disposedgrooves 49 extending between the opposite end surfaces thereof, one of which receives the ball 48. It willbe apparent that the ball 48 is free tov move with the shaft l9 within its groove 49..

In order to provide means for properly aligning the variousparts of the compressor 38 within the casing 3| and the casing 3| with respect to the housing l3, there is provided within the end of the casing 3| within which the compressor 38 is received a plurality of radially disposed, inwardly projecting, longitudinally extending guides indicated at The exterior surface of the end caps 22 and 39 are formed of such a diameter as to slidably fit the inner surface of the guides 5|, and the cylinder 4| 'is' provided with a radially disposed projection 52 likewise adapted to slidably engage the'inner surfaces of the guides 5|.

Disposed beyond the support 36 within the The spring and cap structure M 4 casing 3| is a fuel supply pump indicated generally at 53 and a fuel metering pump indicated generally at 54 (see Figs, 2, 3, and 4) The fuel supply pump 53' consists of a pair of end plates 56 and 51 between which is located a cylinder block 58. Formed as a part of the end plate 51 is a metering pump block 59 beyond which is a metering pump end plate 6|. The end of the casing 3 containing the fuel supply pump 53 and the metering pump 54 is similarly provided with longitudinally disposed guide rails 62 within which the various elements of the fuel supply pump 53 and. fuel metering pump 54 previously referred to are adapted to be slidably disposed.

In order to secure all of the various elements of the air pump 38, the fuel supply pump 53, and the fuel metering pump 54 together within the casing 3|, and-in order to secure the casing and its various elements to the housing |3, there is provided a plurality of securing means to be hereinafter described and by the employment of which the various elements of the'structure are successively secured to" on another and the entire structure secured to the housing |3'.- One of such securing means is a plurality of machine screws indicated at 63 which extend through openings 64 formed in the support 36 in such manner that the fuel supply pump end cap 56 may be secured by such bolts to one side of the support 36 while the end caps 22 and 39 and the cylinder block 4| are secured to the oppositesurface of the support 36. It will be noted from Fig. 1 that the end cap 22 has threadedopenings; 65, formed therein for receiving the threaded ends of the screws 63 while the end cap 56 has countersunk openings 66 extending thereacross for receiving the heads of the bolts 63. It will be noted from Fig. 6 that the cylinder block 4| is provided with relief openings indicated at 61 for receiving the screws 63, these relief openings being larger than the studs so as to permit proper positioning of the cylinder block within the guides 5|. From Fig. 7 it will likewise be apparent that the end cap 39 is also provided with relief openings indicated at 68 which are also larger than the screws 63 for a similar purpose.

It will be apparent that when the end cap 56 is positioned on one side of the support 36 and the end cap 39, the cylinder block 4| and the end cap 22 are'positioned upon the opposite side of support 36, all of such elements being properly positioned within the guides 5| and 62, that the screws 63 then may be inserted in the various openings and all of the elements referred to will be properly assembled upon the support 36.

Thereafter the entire casing structure may be assembled upon the housing l3 by the employment of machine screws indicated at 69. In order to be able to employ the machine screw '69, there is provided in the housing I3 within the annular flange 28 countersunk openings, indicated at H which are formed in the housing in such manner as to be insertable from the interior of the housing i3. By referring to Figs. 5, 6, and lit will be noted that the distance between the openings provided for the machine screws 69 is greater than the diameter of any of the elements of the air pump 38 so that the machine screw extends through the casing, 3| outside of the elements of the pump 38. ,Howeventhe support 36 is provided with enlarged bosses indicated at 12 and in which openings are provided for receiving T-nuts 13 in which the inner ends of the machine screws '69 are threaded. When'the machine screws 69 are properly secured within the openings H and acorns? with respect to the-housing I3 by the. machine screw 59 and that the elements of the air pump 33 and the casing 3| will be centrally located with respect to the housing I3 by the end cap 2-! and the guide rails 54 Thereafter by the employment of machine screws 74, it is possible to properly position within the casing 3| and to secure therein upon the support 35 the various elements-of the fuel supply pump 53 and the cylilder block 59 for the fuel metering pump 54. In order to provide for such assembly, end plate 55 is provided with threaded openings indicated at It, the fuel pump block 58 is relieved as indicated at TI, and the metering pump block and end plate 59 is relieved as indicated at it. Thereafter when the blocks 55 and 59 have been properly positioned within the guide rails 62. the machine screws 14 are positioned within relief openings TI and I8 and tightened within the threaded openings i5. I

Thereafter the metering pump and bloci: may

be secured upon the metering pump block 59 by the employment of screws indicated ate l.

The remaining endof the shaft I9 is rotatably securedin a sintered, powdered, metallic, selfaligning bearing 82 which is adapted to bemovably supported within a bearing support surface 33 formed in the endplate 56. The bearing 82 is held against the surface 83 by a spring and cap structure indicated at 84 which is secured rigidly between the cap '6 and the support .35. The opening 3! provided in the support 35 is adapted to be clos'edby a fluid-tight seal indicated at-86, the latterconsisting of a rotating element 81 and a stationary element '88. Referring particularly to Fig. 8, it will be noted that the rotating element 31 comprises an internally flanged cap 89 in which a resilient sealing member 9-I is disposed around the shaft I9. "The opposite end of the sealing member is reinforced by a collar 92 engaging a ring 93 disposed within a circumferential opening formed with the shaft I9. The stationary element 88 of the seal 86 comprises an annular sealing member 94 adapted to run against the adjacent end of the member 89 and 'being supported upon a flanged sleeve indicated at 9B. The flanged portion of the sleeve 95 is engaged by one end of a spring 91, the opposite end of which is disposed against the end surface of an opening 98 formed within the end cap 39.

The flanged sleeve 95 also is movably supported by a flexiblediaphragm indicated at 99, the inner periphery of which is secured between the flanged portion of the sleeve 96 and the adjacent surface of the sealing ring 54. The outer periphery of the diaphragm 99 is secured regidly between the end cap 39 and the adjacent surface of the support 36.

Further, .it will be noted; that the annular space around the. pumpingnunits: onopposite sides of the support are. in open communication through the enlarged openings r64 through which the machine screws 63 extend.

; Referring now particularly to 8', it will be noted that the pumps '38., 53, and 54 are connected by ;various internally and externally formed passagesgto the nozzle I03 of the oil burning apparatusJI-Il. Referringzparticularly to the airpump 38 it will be noted that the "end plate 39 is formed in such manner -as;to provide an inlet passage Hi4 communicating with the annular space Hi5 formed between the pump 38 and the end of the casing ;3 I between the support 36 and the housing I3. As the .rotor fliof the pump 38 is rotated by the shaft 19., air will be drawn inwardly from the annular space 105 and compressed within the pump 38 by the vanes 43. The air within the 'annular space I05 is admitted to the casing 3| through a plurality of ports I96 and 561 formed in the casing 3 l onopposite sides of the support 35. ,It will be apparent that the air which is, admitted through the ports. It! will be admitted to an annular space I08 formed around the elements of the fuel pump 53 and the fuel metering pump 54 and from the annular space His will be admitted to the annular space H through the openings 64.. It will thus be apparent that any oilv fumes which may result from the operation of the pumps 53 and 54 will be drawn-into the pump 38 through the inlet I04.

The outlet or discharge .from the pump 38 is provided by a passage I09 also formed within the end plate 39 and communicating with a passage I IEI formed in the support-36 and communicating with a conduit I I I leading to the air supply passsage II2 of the nozzleil03. The passage III] also has aby-pass indicated at 'I I3 controlled 'by an adjustable needle valve I I4 threaded into the support 36 and accessible from the exterior of the casing '31. The by-pass II3communicates with the annular space 'I-O8.Q"It willbe apparent that by adjusting the needle valve I I4 in the by-pass I I3 it ispossibl'e to control the dischargepressure from the pump 38 to the air supply passage 'I'I2. However, the air which maybe by-pass'ed by the needle valve H4 will not be discharged into the atmosphere except through the inlet passages I06 and It! communicating with the annular spaces I05 and I03. The annular spaces I05 and I08 therefore constitute muflle chambers surrounding the pumps 38, 53, and 54 for the purpose of absorbing air or other noises incidental to the operation of such devices.

Fuel for operating the supply "pump 53 and the metering pump 54 is 'ad'aptedto be supplied through an outer fuel supply chamber indicated at I I6 which constitutes the outer part of the'fuel supply chamber 33 formed in'the'outwardly projecting portion 32 of the casing 3 I. The chamber I I6 communicates with the oil'burning'apparatus fuel supply tank by means of athreaded opening Ill to which a liquid fuel supply conduit, not

shown, is attached 'to the fuel tank, also not shown. Within the supply chamber 1 I6 is a filtering device or oil cleaner indicated at 34, the

filter portion I I8'thereo'f being annularin formation'and secured in the chamber in spaced relation to the outer walls between flanges I I9 and I20 projecting upwardly and downwardly respectively from the upper and lower extremities of the fuel supply chamber 33. The chamber H6 and the filtering device I I8 are accessible'through'an end plate IZI secured upon' th'e upper end of the pro- 7 jection 32 by screws indicated at I22. Within the filtering device H8 is an inner chamber I23 into which th oil admitted to the outer chamber I I6 is admitted through the filtering device I I8. The inner chamber I23 is accessible through the cap I2I and through an'o'pening in the cap I2I within which a'threadedplug I24 is adapted to be normally disposed; Communicating with the inner supply passage I23 is an inlet conduit I26 formed in the support 36 and the end plate 56 and the opposite end of which communicates with the fuel inlet port I2'I of the supply pump or compressor 53. The compressor-53 within the compressor block 58 comprises a pair of meshing gears I28 and I29, the latter gear being rotatably mounted upon shaft I9 upon a ball I3I disposed in concave depressions or openings I32 in the shaft I9. The

ball I3I also extends within one of the grooves I33 formed in the gear I29 throughout the length thereof so as to provide a universal driving connection between shaft I9 and gear I29. The gear I28 is mounted on an idling shaft I34 secured in an opening formed in the end plate 56. The ball I3I is free to move with shaft I9 within the groove I33 so as to provide for axial movement of the shaft I9 relative to compressor 53. The flexible or universal driving connection between the shaft I9 and gear I29 provided by the ball I3I, and the universal connection between the shaft I9 and rotor 46 of the air pump 38 provided by the ball 48, will compensate for misalignment of the shaft I9 and rotor 46 or gear I29, and will permit rotation of rotor 46 and gear I29 within their respective chambers without bias from the shaft I9, and rotation of shaft I9 within its bearings without bias from rotor 46 or gear I29.

The discharge side of the compressor 53 is connected through an exhaust port I36 and an exhaust passage 'I3I to an exhaust chamber I38 formed within the end plate 56 and the opening 31 within which the seal 86 is located. The exhaust passage I38 communicates with the fuel metering pump chamber indicated at I39 through a passage I46. The exhaust chamber I38 also may communicate with the inner fuel supply passage through a passage I4I controlled by a bypass valve I42. The by-pass valve I42 is adapted to' seat in the bottom of an enlarged valve chamber I 43 forming a part of the passage MI and in which is located a spring I44 adapted to urge the valve I42 into engagement with its seat at thelower part of the valve chamber I43. The opposite end of 'the spring I44 is disposed against the inner end of a threaded stud I46, the head of which is positioned within the inner supply chamber I23 and accessible through the opening closed by the plug I24. In the event it is desired to have the by-pass I,4I communicate with.the inner supply chamber I23 a stud I46 having a passage indicated at M1 is employed. When such a stud is employed, then liquid may be by-passed from the exhaust chamber I38 to the inner fuel supply chamber I23 through the by-pass valve I 42 and the passage I4'I. However, it may be desirable to by-pass the fuel through the by-pass valve I42 to the inner chamber I23. In such event a stud like that indicated at I46 is employed without the opening I4'I being formed therein. Whensuch a stud isemployed then th liquid from the exhaust passage I38 may be by-passed directly to the fuel supply tank previously referred to through a passage I48 which communicates with the chamber I53 and which is adapted to be connected by a threaded opening indicated at I49 to a return conduit, not shown, but which communicates at the opposite end thereof with the fuel supply tank.

It will be apparent that the operation of the pump 53 by the driven shaft I9 will tend to pump liquid fuel from the fuel supply chamber I I6 into the exhaust chamber I38 and the fuel metering pump chamber I39. In the event the liquid fuel is not exhausted from the chambers I38 and I39 as fast as it is delivered by the pump 53, a certain amount or all of the fuel supplied by the pump 53 will be by-passed through the conduit I4I either to the inner supply chamber I23 or the fuel supply tank, not shown, this depending upon whether the passage I41 is or is not employed in the stud I46. However, the operation of the fuel metering pump 54 may tend to relieve the pressure in the chambers I38 and I39 by supplying therefrom metered quantities of fuel to the oil burning nozzle I03. For this purpose the inlet port I5I of the fuel metering pump 54 is connected to the fuel metering pump chamber I39 by a passage I52.

The fuel metering pump 54 comprises a rotor I53 which is slidably disposed within the metering pump chamber I39 against the inner surface I54 of the end plate 6I The rotor I53 is driven by a ball I56 disposed in an eccentric opening formed in the adjacent end of the shaft I9 and a centrally disposed opening formed in the adjacent surface of the rotor I53. It will be apparent that the spring 91 will exert a resilient pressure upon the shaft I9 tending to urge the shaft towards the rotor I53 for driving the rotor in a circular path against the wall I54. The ball I56 provides a universal connection between shaft I9 and rotor I53 so as to insure that the rotor I53 will seat against the wall I54 and have a sealing fit therewith. The rotor I53 has a cylindrical radially disposed opening I5I projecting therein in Which a piston I58 is reciprocally disposed. The opposite end of the piston I58 is received within an opening formed in a spherical bearing member I59 which is mounted for lengthwise movement and oscillatory movement within a cylindrical opening I6I formed across the end of the metering pump block 59 and which communicates with the metering pump chamber I39 through an elongated opening I83. The piston I58 is resiliently mounted within the bearing I59 upon a spring I 64 held between the end of the piston I58 and a cap I66 secured in the bearing member I59 opposite the. piston I58. The spring I64 tends resiliently to retain the ball I59 tightly within the cylindrical opening I6I. It will be apparent that the spherical bearing member I59, the piston I 58, and the rotor I53 are free to move laterally within the metering pump chamber I39 away from the wall or inner surface I54 of the end plate 6|. However, the spring 97 will tend to support the shaft I9 in such manner as to resiliently oppose such movement and in such event the rotor I53 will normally be movable in a circular path against the surface I54 of the end plate 6 I. Since spherical bearing member I59 and rotor I53 are free to oscillate, piston I58 will reciprocate within cylinder I5'I upon movement of rotor I53. In order to render the metering pump 54 operative during the rotation of the shaft I9 and the rotor I53, the cylinder I5'I formed within the rotor I53 is provided with a port I6'I which is adapted to move in a circular path upon the wall I 54 during the movement of the rotor I53 by the shaft I9. The port I6! is adapted to communicate with the metering pump inlet port I5I during the movement of the piston I 58 outwardly with respect 91 to. the. cylinder I51 andctoj communicateiwith meteringdischargeporttfifl whenthe; piston I58 moves inwardly with respect. to; the. cylinder I51, The discharge. .port .188- communicates through discharge passage [69' and-,conduit I1 I with the fuel supply passage. I512. formed in. theoil burnernozzle. I83. It. will; be: apparent. that-the operation of the fuel metering: pump 54 will discharge into the fuel-.supplypassage I112 of" the nozzle I83 measured. quantities or fuel: from the. fuel meter,- i-ng: pump chamber" I738. Also.,, it willbe noted that the. passages I52 and IE8 each. are connected to anti-surge chambers I14 and; I18 respectively, these chambers being at; all. times partly filled with air as: is indicatedv at I11 soas to dampen any pulsations inthes flow of the liquid received or delivered; by the metering pump The oilburner nozzle. I83 is disposed within a main air supply conduit. I18: which communicates with the centrifugal fan located. within the fan housing I3 and driven by the shaft I'2z.. Thefan supplies to the conduit I18 the main air supply for; operating the oil burningapparatus. The nozzle. I88 is. located centrally and axially within the air supply conduit I18 in such .mannerthat the air delivered. byr'thes fan. flow around the nozzle I83' toward the mixing "chamber end of the nozzle; which is indicated. by thenumeral I19. The mixing chamber. portion I.19 of the nozzle I83 comprises an annular chamber I8I for receivingv air fronr the air supply'passage H2" and a cylindrical: chamber I82 for receiving fuel from the fuel supply passage I112. The chamber I82 is disposed internally with respect. to the chamber I8I:. The endof the chamber I82 terminates in a discharge orifice: I83 with which chamber I82 communicates. through a frusto-conical vmixing passage: I'84.. The: passage; I84; is supplied with fuel from the chamber." I382 by spirally formed passageslafi.

During operation. of the :oil burning apparatus, it will; be apparent thatv a. 'main air supply will be delivered. to the nozzle-103' by the. conduit I18, and that the pumping; unit II will supply measured quantities of liquidfueland air to the chambers I82. and I8JI respectively. The adjustment of the by-pass I- M and: the: adjustment: of the meter-- ing pump 54-. is such. that the air: and fuel will be delivered. respectively'to: the chambers [BI and I82 at about the same pressures. The discharge orifice I83 will therefore discharge into. the air flowing within. the conduit I18 a relatively rich mixture of fuel. and primary air. Such mixture when discharged from the, orifice I83 is adapted to be ignited by an igniter I86 comprising a pair of electrodes. I81 positioned adjacent the orifice I83.. The rich mixture so ignited by the ignitor I88 will burn within. the main air supply supplied by the. conduit I18 and. beyond the'end of air cone ornozzle I89 which is provided at the end of the conduit I18 andxbeyondi the discharge orifice I83. I

It will be noted that the. fuel. supply conduit ITI is provided with asolenoid actuated control valve indicated at I9 I. The valve I9! comprises an armature I92 disposed within the solenoid I93 and. adapted to open and close a needle valve I94 with respect to an orifice I99 formed in a valve casing I95 which is connected within the-conduit IN. The electrical circui-tfor'operating the solenoid I88 is connected inparallel with the running windings for the motor employed in the apparatus I8 by a centrifugally actuated switch I91 which is operated by the motor shaft I98. The switch I91 comprises a bracket I99 secured 10 rigidly to the shaft I98 which abuts one end ofa spring 28I disposed: about the shaft I98 and the opposite end of which engages an axially movable ring 282 also disposed about the shaft I98. The ring 292 under influence of spring 28I- reacts on switch element 288to close the circuit through the running windings for the motor. L-shaped lever weights 288, which are adapted to fulcrum about points 288 formed at the ends of supports 281 projecting laterally with respect to the bracket IE'I-B reach on ring 282, under the influence of. centrifugal force to shift ring 2% against spring 28I to open the circuit through the running windings when the motor has attained its normal operating speed. The ring 282 engages a-switch element 288 at 289, theswitch element 288 being secured to-a casing 2H of the motor of the oil burning apparatus I8 as. is. indicated at H2. The opposite end of the switch element 288 carries a pair of contacts indicated at 2I3- adapted in oneposition to engage a con tact 2 I I andin another to engage a contact 218. In the position in which the elements of the centrifugal switch I91 are. illustrated in Fig. 8, the motor shaft I98 has attained normal operating speed and under suohconditions the solenoid atcuated valve I91 is open to allow fluid to flow from the metering pump 54 throughthe conduit ill to the fuel compartment I82. However, before the shaft I98 has reached such normal .operating speed and. after the controls of the oil burning apparatus have been actuatedin such manner as to reduce the speed of the shaft I93 below normal-operatingspeed the ring 282 will be moved by the spring 28I away from the bracket E88 and in such manner as to move the switch element 288 to break the. circuit between contacts 2I3 and 2I4 and to make. an electrical circuit betweemthe contacts 2t? and 2H5, Under such circumstances it will be apparent that the solenoid ;actu-ated valve IBI will operate to close the flow of fuel through the passage ill by closing the needle valve. 94111301 1 the orifice I98. The switch I91 therefore will not permit the flow of fuel from the metering pump Mtothe nozzle I88, except when the shaft I98 of the motor of the oil burning apparatus III is operating at a predetermined: or normal speed. However, since the motor shaft I98 operates the fan shaft I2 and the pumping unit shaft I9, it will be apparent that the fuel'metering pump 54, the fuel supply pump 58, and the air pump 38 will be operated bothbefore and after the motor shaft I98 reaches such predetermined or normal opcrating speed and the centrifugal switch I91 is actuated in such manner as to open the solenoid actuated valve I9I. Under such circumstances the air from theair pump 38. will continue to be delivered through the orifice I8-8,.but the closing of-the valve ls lywill prevent a normal how of fuel from the passages I88 into: the mixing passage IiS l; Under such circumstances the pressure will; rise the oil supply-conduit I'II to such an extent that the fluid'pressure between the rotor 1:83 and the wall I 54a will force the rotor I89away from the wall Itdjtoi an; extent great enoughto relieve the? pressure in the conduit Ill. The. rotor IE9, is movable in response to such increase-in pressure within the conduit MI by mason of the fact thatitis: possible for both the rotor. its: and the'piston 5-58. to move axially with theshaft I8 within the metering pump chamber I38. Such axial movement isprovided for by movementof the shaft I39 withing the coupling I8 and against the; compression of the spring 91, the universal connections between the shaft I9 and air pump rotor 46 and gear pump 53 permitting such axial movement of shaft 19.

This application is a continuation of my copending application Serial No. 13,718 for Oil Burner Pumping Unit, filed March 8, 1948, now abandoned.

While I have illustrated and described a preferred embodiment of my invention, it is understood that this is capable of modification, and I therefore do not wish to be limited to the precise details set forth, but desire to avail myself of such changes and alterations as fall within the purview of the following claims.

I claim:

1. An oil burning apparatus including a driving shaft and a fuel and air pumping unit, said pumping unit comprising a casing having a support extending thereacross and a plurality of guides, bearing means disposed on opposite sides of said support, a driven shaft extending within said casing and across said support and being rotatably mounted within said bearings, fuel and air pumping means disposed on opposite sides of said support in driven relation to said shaft, said fuel and air pumping means being mounted within said casing in engagement with said guides, means for securing said fuel and air pumping means against the opposite surfaces of said support, fuel metering means secured to said fuel pumping means within said casing, said fuel metering means being driven by said shaft and being operatively associated with the discharge side of said fuel pumping means, and means for securing said pumping unit to said oil burning apparatus with said shaft of said pumping unit in operative relation to said driving shaft of said apparatus.

2. An oil burning apparatus including a driving shaft and a fuel and air pumping unit, said pumping unit comprising a casing having a support extending thereacross and a plurality of guide rails extending radially inwardly thereof, bearing means disposed on opposite sides of said support, a driven shaft extending within said casing and across said support and being rotatably mounted within said bearings, fuel and air pumping means disposed on opposite sides of said support in driven relation to said shaft, said fuel and air pumping means being mounted within said casing in peripheral engagement with said guide rails, means for securing said fuel and air'pumping means against the opposite surfaces of said support, and means for securing said support to said oil burning apparatus with said shaft of said pumping unit in operative relation to said driving shaft of said apparatus.

3. An oil burning apparatus including a driving shaft and a fuel and air pumping unit, said pumping unit comprising a casing having a support extending thereacross and a plurality of guide rails extending radially inwardly thereof. bearing means disposed on opposite sides of said support, a driven shaft extending within said casing and across said support and being rotatably mounted within said bearings, fuel and air pumping means mounted on opposite sides of said support and being driven by said shaft, said fuel and air pumping means being mounted within said casing in peripheral engagement with said guide rails and means for securing said pumping unit to said oil burning apparatus with said shaft of said pumping unit in operative relation to said driving shaft of said apparatus.

4. An oil burning apparatus including a driving shaft and anoil and air pumping unit, said pumping unit comprising a hollow'casing having a support extending transversely thereof intermediate the ends thereof, oil and air pumping means disposed on opposite sides of said support, means for securing said oil and air pumping means to said support, bearing means disposed on opposite sides of said support and carried by said oil and air pumping means, said support having an aperture therein forming a seal chamber, a driven shaft extending'through said aperture and rotatably mounted within said bearings, said oil and air pumping means being arranged in driven relation to said shaft, and a running seal arranged in said chamber and around said shaft and forming a running seal between said shaft and said support, part of said supportbeing exposed to the exterior of said casing, said support being provided with ducts forming passages communicating with the inlet and discharge sides of said oil and air pumping means and terminating'in the outer surface of said casing whereby oil and air lines of the oil burning apparatus may be connected in fluid flow relation with said oil and air pumping means, said aperture forming a part of one of said passages, said seal being disposed between said oil and air pumping means so as to prevent leakage of oil along said shaft into said air pumping means. 7

5. An oil burning apparatus including a driving shaft and an oil and air pumping unit, said pumping unit comprising a hollow tubular casing having a support extending transversely thereof, oil and air pumping means disposed on opposite sides of said support, means for securing said oil and air pumping means to said support, bearing means disposed on opposite sides of said support and carried by said oil and air pumping means, said support having an aperture therethrough, a driven shaft extending through said aperture and rotatably mounted within said bearings, said oil and air pumping means being arranged in driven relation to said shaft, oil metering means secured to said oil pumping means within said casing, said oil metering means being driven by said shaft and being operatively associated with the discharge side of said oil pumping means and a running seal arranged in said aperture and around said shaft and forming a seal between said shaft and said support, said seal being disposed between said oil and air pumping means so as to prevent leakage of oil along said shaft into said air pumping means.

6. An oil burning apparatus including a driving shaft and a fuel and air pumping unit, said pumping unit comprising a hollow tubular casing having a suport extending transversely thereof, fuel and air pumping means disposed on opposite sides of said support, means for securing said fuel and air pumping means against the opposite sides of said support, bearing means disposed on opposite sides of said support and carried by said fuel and air pumping means, said support having an aperture therethrough, said driving shaft extending through said aperture and being rotatably mounted within said bearings, said fuel and air pumping means being arranged in driven relation to said shaft, fuel metering means within said casing, said fuel metering means including a pump element driven by said shaft and being operatively associated with the discharge side of said fuel pumping means, a block against which said pump element is adapted to move during opera- 13 I tion of said metering means, said block having duct communicating with said discharge side of said fuel pumping means, said pump element having a port adapted to be brought into and out of registry with said duct during operation of said metering means, and ball arranged in a socket in said pump element and a socket in the end of said shaft, said ball providing a universal connection between said shaft and pump element for maintaining a sealing engagement between said pump element and said block.

7. An oil burning apparatus including a driving shaft, an oil supply pump mounted on said shaft and including a rotary element having a driving connection with said shaft adapted to permit axial movement of said shaft relative thereto, an oil metering pump arranged at the end of said shaft and including a pump element having a universal connection with said shaft and adapted to be driven thereby, a block having a lapped face and an oil duct terminating at one end in said face, said duct at its other end communicating with the discharge side of said oil supply pump, said pump element having a lapped face seated against the lapped face of said block and a port adapted to be brought into and out of registry with said duct in said block upon operation of said metering pump, said universal connection between said shaft and pump element comprising a ball arranged in a socket in said pump element and a socket in the end of said shaft, and spring means reacting on said shaft, ball, and pump element for resiliently holding the lapped face of the later in sealing relation with the lapped face of the block.

8. Oil burning apparatus according to claim "I wherein said rotary element of said oil supply pump is provided with an axially extending groove, said shaft having a depression therein, said driving connection between said shaft and rotary element comprising a ball projecting into said depression and into said groove so as to provide a universal connection between said shaft and said rotary element.

. 9. An oil burning apparatus including a driving shaft, an air supply pump mounted on said shaft and having a driving connection therewith adapted to permit axial movement of said shaft relative to said air pump, an oil supply pump mounted on said shaft and having a driving connection therewith adapted to permit axial movement of said shaft relative to said oil supply pump, an oil metering pump arranged at the end of said shaft and including a pump element having a universal connection with said shaft and. adapted to be driven thereby, a block having a lapped face and an oil duct terminating in said face, said pump element having a lapped face seated against the lapped face of said block and a port adapted to be brought into and out of registry with said duct in said block upon operation of said metering pump, said universal connection between said shaft and pump element comprising a ball arranged in a socket in said pump element and a socket in the end of said shaft, and spring means reacting on said shaft, ball, and pump element for resiliently holding the lapped face of the latter in sealing relation with the lapped face of the block.

10. An oil burning apparatus including a driving shaft, an air supply pump mounted on said shaft and including a rotor through which said shaft extends, a driving connection between said rotor and said shaft, and oil supply pump mounted on said shaft and having a rotary element through which said shaft extends, said rotary element having an axial slot therein, said shaft having a concave depression therein, a ball driving member arranged in said slot and said depression in said shaft so as to provide a universal driving connection between said shaft and said rotary element thereby permitting relative axial movement between said shaft and said rotary element, a fuel metering pump having a driven element arranged at the end of and connected to said shaft so as to be driven thereby, a block against Which said driven element of said metering pump is adapted to move and seat during operation thereof, a ball arranged between the end of said shaft and said driven element, and spring means operable for biasing said shaft, ball, and driven element toward said block, said ball providing a universal connection between'said shaft and said driven element for seating said driven element against said block.

11. An oil burnin apparatus including a driving shaft, an air supply pump mounted on said shaft and including a rotor through which said shaft extends, a driving connection between said rotor and said shaft, an oil supply pump mounted on said shaft and having a rotary element through which said shaft extends, said rotary element having an axial slot therein, said shaft having a concave depression therein opposite said slot, a ball driving member arranged in said slot and said depression in said shaft so a to provide a universal driving connection between said shaft and said rotary element, a fuel metering pump having a driven element arranged at the end of and connected to said shaft so as to be driven thereby, a block against which said driven element of said metering pump is adapted'to move and seat during operation thereof, a ball arranged between the end of said shaft and said driven element, said ball providing at least a part of a universal connection between said shaft and said driven element.

12. Apparatus according to claim 5 wherein said shaft is movable axially relative to its bearings and to said oil and air pumping means and wherein a universal driving connection is provided between said shaft and said oil and air pumping means.

13. Apparatus according to claim 5 wherein said metering pump is arranged at one end of said shaft in driven relation therewith and so as to take axial thrust of said shaft, and wherein said seal includes a spring biasing said shaft towards said metering pump.

14. Apparatu according to claim 5 wherein said metering pump is arranged at one end of said shaft and a ball provides a universal driving connection and thrust member between said shaft and said meterin pump.

ROBERT R. WITHERELL.

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

UNITED STATES PATENTS Number Name Date 1,868,161 Dilg July 19, 1932 1,878,736 Vickers sept. 20, 1932 1,986,003 Lum Jan. 1, 1935 2,312,886 Ellinwood Mar. 2, 1943 2,383,092 Wahlmark Aug. 21, 1945 2,412,383 Baker Dec. 10, 1946 2,413,035 DeLancey Dec. 24, 1946 2,495,685 Beaman et al Jan. 31, 1950 ,5 8,982 Roosa Jan. 23, 1951

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