US2346398A

US2346398A - Oil burner

Info

Publication number: US2346398A
Authority: US
Inventors: Henry C Rohr; Peter R Contant
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1940-07-17
Filing date: 1940-07-17
Publication date: 1944-04-11
Anticipated expiration: 1961-04-11

Description

April 11,- 1944.

H. c. Rol-m ETAL 2,346,398'

OIL BURNER Filed July 1v, 1940 2 swans-'sheet 2 r 9i Cttornegs Patented Apr. 1l, 1944 n assignors to General Motors Corporation,

' Detroit, Micln, a corporation ot Delaware Application July 17, 1940, Serial No. 343,033

's claims. (ci. rose-42) This invention relates generally to oil burners and more particularly to improvements in the construction of burners of they gun or pressure atomizing type.

Oil burners of this type are generally characterized by the provision of a rotary air fan and a fuel oil pump driven by a common electric motor. An oil filter is generally provided between the source of oil and the intake to the oil pump and oil under pressure from the pump outlet is supplied through the intermediary of a pressure regulating valve arrangement to an atomizing nozzle adjacent or within an air duct from the fan.

One object of the present invention is to provide a unit assembly which includes one of the endbearings for the motor shaft, an oil pump assembly, the pressure regulating valves and an oil filter in which all of such parts are readily accessible for examination, repair or replacement.

.4i further object of the invention is the construction of the oil pump together with a sealing means for the rotating shaft of the pump as a unit assembly which may be readily installed and removed as a unit without disturbing other parts ci the burner.

.e still further object lis the provision of the oii filter in the form of a readily removably cylinder or tube around the oil pump unit whereby all Figs. 6, 7 and s are elevations-.of the several parts of the oil pump to be described hereinafter.

in detail.

Referring ilrst to Fig. 1- for a general showing of the complete oil burner, the rotary fan or blower housing 2 with the integral burner tube 4 Ais supported on pedestals 6. Thevelectric motor .with a shaft carrying the fan or blower on one end and connected to drive the oil pump at the proceeding now to a detailed description of the oil tothe pump intake passes through the filter which may be readily removed for inspection and replacement when desired.

With reference to the foregoing objects, the

construction and arrangement of parts is such as to not only simplify the same and provide for ease ci' manufacture and accessibility for inspection and service but also to eliminate projecting parts and provide the minimumo external connections to thereby improve the appearance of the complete burner. y

Other objects and features of the invention to'- gether with the advantages thereof wili be apparent from. or specifically pointed out in the follow- A ing description and accompanying drawings of one embodiment of the invention in which:

Fig. 1 is a side elevation, with parts broken away, of a completeburner.- l l w Fig. 2 is an enlarged vertical section, taken present invention and referring particularly to .

Figa

2 and 5, Aa casing 24 is adapted to be secured to the motor frame 8 in any desired manner. This casing 2s constitutes an end housing for the motor and is provided with the bearing 2t for one end of the motor shaft 23. The motor shaft 23 is provided with an oil slinger groove and oil slinger ring 32 on opposite sides of the bearing 26 and lubrication is provided by the oil wick 3e in chamber 36 to which oil may be supplied through oil cap 38 and passage t6.

The casing 2t ls formed with a relatively large chamber te having an end opening adapted lto be closed by the cap t8 secured to the casing as by screws Eil with a sealing gasket 5E to form a housing for the oil pump and filter unit. This chamber @l also constitutes a suction chamber for the pump and communicates at one side with the oil supply pipe it. An upwardly extending baille.

oribarrier wall lit is provided in chamber It adjacent the connection to oil pipe i4 to permit the oil inlet to be brought in at the side of the casing substantially online 2-2 of Fig. 1, of that portion of the burner embodying the present invention. Fig. 3 is a fragmentary section to show certain passages taken substantially on line #-3 of Fig. 5.

Fig. 4 is a fragmentary section taken substantially on line 4-4 of Fig. 5.

Fig. 5 is a transverse section taken substantially on line B-l of Fig. 2. v

and. trap a certain amount of oil in the chamber up to the level of the upper edge of the baille or barrier wall to thereby keep the pump and surrounding iilter covered with oil.

Theoil pump body comprises the circular plate 56 which is secured between

end plates

58 and 80 as a unit ley-screws 62 in the diametrically opposite holes 64, and to accurately align the plates axially when assembling the unit in the manner to be hereinafter' described. dowels 68 are also provided in the diametrically opposite holes 68.

'Ihe oil pump per se is of conventional type comprising the pinion 10. crescent 12 and internal gear 14. The internal gear 14 is journaled within the pump body plate 56 and adapted to be rotated by the pinion 'I0 having diametrically opposite slots 16 to receive the ends of the ldrive pin 18 passing through th'e pumpshaft 80.

Before proceeding to a further description of the pump unit it is desired to note that certain parts mentioned above have been shown in Fig.

The oil pump with the'several plates and the sealing means is assembled together as a complete unit which may be readily installed or re- 6 as if secured to or forming a part of the plate Y 60, but it should be understood that the pump shaft 80 extends through and rotates relative to f this plate, the crescent 12 may be separately formed and merely positioned on the plate 60 by dowels, and the dowels 66 are adapted to fit within holes in plates 60 similar to the holes 68 in

plates

56 and 58. With further reference to the assembly of plates 56, 58y and 60-with the pump parts it has been found desirable to first assemble the plates with a shaft and a set of slightly oversize gears and th'en drill the dowel holes 68 so that when the oversize gears are removed and the pump unit is assembled with gears of the correct dimensions, the parts will operate smoothly Without binding.

The face of the outer or front plate 58 which is adapted to contact with the plate 56. is formed with an oil intake groove or channel 82 extending from the periphery thereof to a recess 84 adjacent the intake area of the pump gears and the inner or rear plate 60 is formed on the face opposed tothe plate 56 with a recess 86 adjacent the discharge area "of the pump gears which communicate with an oil outlet passage 88 ex- Y tending through plate 60 to the opposite face thereof. 'I'he plate 58 is formed with a further recess 90 which Iis opposite the recess 86 in plate 60 andthe plate 60 is formed with a further recess 92 which is opposite the recess 84 in plate 58, such recesses 80 and 02 serving'to equalize the pressure on the side faces of the pump gears and thus prevent undue side pressure on the gears.

The rear face of the plate 60 is provided with a cylindrical recess to form a chamber 94 to house the pump shaft sealing means. The pump shaft 80 is formed witha shoulder 96 and abutting this shoulder is a hardened sealing ring 98 which may be held in position by a ring |00 on the shaft. The ring |00 is preferably made of such material as Duprene, neoprene, or similar rubber substitutes or such material as will seal the joint between th'e shaft 80 and the sealing ring 98. The rings 98 and |00 rotate with shaft 80 and the ring 98 is adapted to be engaged by a sealing ring |02 which is secured to av exible diaphragm |04 by means of a member |06 which is spun over the inner edge yoi? ring I 02. The outer edge ofthe diaphragm |04 is secured against a shoulder withinl the recess in plate 60 by a screwthreaded clamp ring |06 with a slightly iiared wash'er and a flat washer interposed between the clamp ring and diaphragm `as shown.

The engaging surfaces ofthe seal rings 98 and -with the

plates

56, 58 and 60.

moved. As has been heretofore Adescribed thepump parts are assembled with the three plates `56, 58 and 60 secured together by screws 62.- As

shown in Fig. 2 the outer end of the pump shaft 80 is extended beyond the plate 58 and held from inward movement by the cotter key,| I4 and washers II6, whereas outward movement of the shaft 80 is resisted by spring ||0 and limited by en. gagement of member |06 with the adjacent portion of ,plate 60.

The inner end of the pump shaft 80 and the adjacent end of the motor shaft 28 are provided with a suitable coupling I8 such as a cooperatingtongue and groove and the unit assembly of the pump and sealing means may be secured t the .casing-24 by the spaced screws |20, shown as flve in number, extending through aligned holes |22 in

plates

56, 58 and 60, with a sealing gasket |24 clamped between casing 24 and plate 60.

A filter |26 is positioned in casing 24 within the chamber 46 and may be made of any suitable,l

material such as cotton yarn wound on ascreen wire supporting cylinder Y|26 which is concentric This filter is adapted to be removably clamped against. the casing 24 by the end cap 48 which is formed with the circular angular face |30 which embeds itself in one end of the'fllter |26 as shown in Fig. 2

and compresses the lter against the casing at its opposite end.

The casing 24 is formed with'a recess adjacent the inner end of thev pump unit to provide a space |32 to receive the inner end of the pump shaft 80 and the coupling ||8 to the motor shaft 28 and a passage |34 extends through the .casing 24 from this space |32 to drain any o il which may leak into the space |32 to a point outside of casing 24 and indicate that the sealing means is not functioning properly. The upper side of casing 24 is also provided with an opening into the chamber 46 which may be normally closed by a plug |36 to provide for priming the pump or for attaching a vacuum. gage to test the pump suction.

As has been heretofore described, the plate is provided with the oil outlet or discharge passage 88 extending to the inner face thereof. An opening through the gasket |24 is adapted to be aligned with this passage and passage |38 in the casing 24 which communicates with intersecting passages |40 and |42 drilled in the casing 24 which are closed at their junction with the outside of the casing by plugs |44 and |46, respectively.

Such passages supply the oil from the pump to a pressure regulator chamber |48 in the casini;v

passage II2 is provided through the plate 60 to .connect the chamber 94 to the suction chamber 46.

the' removable cap |60.

Considering now the operation of the pressure regulating valve arranged described above, it will be seen that when the pump is not operating, the

spring |64 holds the pistonJS against valve |10 sure in this chamber or to vent any air from the system.

As will be apparent from the foregoing description. the-oil pump and seal assembly is readily detachable as a unit-and may be separately tested or quickly removed and a new unit substituted with only a short interruption of burner operation. The filter surrounds the pump unit and is of simple structure and readily removable for cleaning or replacement, and all oil including that recirculated through the pump must pass through the filter to enter the pump intake channel 82.

l All of the principal parts are contained within the to supply oil to the burner nozzle. During a part l of the travel of the piston the valve Il@ remains seated in port ile, but when movement of this valve is stopped by engagement of a shoulder thereon with the end of the cage IM, the continued movement of the piston opens the port |14 to permit excess oil to flow into the by-pass chamber |18. p

The pressure .regulating valve arrangement is therefore such that oil is only delivered .through port |66 to the burner nozzle when the pressure thereof is of the desired value or range of values and whenever the pressure in chamber |48 exceeds the desired value, the oil will be by-passed through port |14 into the chamber |16. When the pressure drops below the desired value due to stopping the oil pump or for any other reason,

' the piston |50 will move to first close by-pass port |14 and then move both values to close the burner port |66. `'I'he bleed groove |18 in value |1Q permits oil leakage through the port |16 to reduce the pressure in chamber |48 and permit quick and complete closing of the burner port |66 when the pump is stopped. It will be apparent that the pressure of th oil to the burner nozzle may be readily adjusted by the spring tension adjusting screw |58 and the extent of opening of port |14 and amount of oil entering the by-pass chamber |16 will be governed by the oil pressure and the settingoi.' the spring les. 'I'he oil which is lay-passed to chamber |16 may be either recirculated directly to the pump intake chamber or returnedto the supply As shown in Fig. 3, aligned threaded openings are provided in casing 26 from the luy-pass chamber |16 to the intake chamber. 48 and to the outside of casing 24. 'I'he inner opening |86 into the chamber 46 is slightly smaller than the outer vopening |82 which is shown as closed .by a plug |84 whereby the oil.from the by-pass chamber` |16 will be returned directly i to the pump intake or suction chamber 48. If

it is desired in any installation to return the oil to the supply tank, it is merely necessary toremove the plug |64, place a plug in the inner opening. IIB and connect an oil return pipe with the outer opening |82.

As shown in Fig. 4 a passage |66 is provided in the lower 4part of casing 24 and normally closed by a plug |88 to permit the chamber 46 to be drained and cleaned. An opening through the casing into pressure regulator chamber |48 may als be provided as shown in Fig. 2 and normally closed by a plug i to permit the connec- I5 single casing 24 with the advantage that the parts are maintained in their proper relation and the external appearance is improved as will be particularly apparent from the showing in Fig. 1.

It will be apparent that many changes and modifications may be made in the detailed conl struction and arrangement of parts within the scope of the present invention and that many advantages of the several novel features thereof in addition to those specifically mentioned here-l in will be obvious to those skilled in the art. 4

We claim: l. In an oil burner, -a fuelsupply unit inciud-. ing an electric motor having a motor frame and a. motor shaft, a unitary housing secured to said motor frame and provided with a portion forming a closure for an end of said motor and a bearing for one end of said motor shaft.y a pump chamber in said housing, a fuel pump unit in said chamber including pumping elements, a pump shaft. and sealing means for said pump shaft, a`

coupling between said motor shaft and pump shaft, a recess in said housing between said motor shaft bearing and said pump unit to receive said coupling, and a drain passage extending from said recess through said housing to the outer side of said housing whereby said drain will serve to indicate any leakage of oil .pastsaid sealing means into said coupling recess.

2. In an oil burner, ahousing provided with' a pump chamber having inlet ,and outlet passages,

a fuel pump unit including intermediate and end plates, pumping elements in said intermediate plate, an intake passage formed between said intermediate plate and` one of said end plates, an

outlet passage extending through said other end plate adapted to communicate with said pump 'chamber outlet passage, a pump shaft journaled in said end plates, a. sealing means for said pump shaft connected to one of said end plates, means to secure said plates together whereby said pump unit comprises a self-contained unit incorporating the said pumping elements, pump shaft and pump shaft sealing means, and means for detachably securing said pump unit to said housing within said pump chamber.

3, In an oil burner, a housing provided with a pump chamber having inlet and outlet passages, a. fuel pump unit including intermediate and end plates, pumping elements in said intermediate plate, an intake passage formed between said intermediate plate and one of said end plates,

an outlet passage extending through said other end plate adapted to communicate with said with means forcing the same into engagement' with said rotatable sealing ring, means to secure said plates together whereby said pump unit com prises a self -contained unit incorporating the said pumping elements, pump shaft and pump shaft sealing means, and means for detachably securing said pump unit to said housing within said pump chamber.

14. In an oil burner, a fuel supply unit including a housing-formed with a pump chamber having an end wall adapted to receive the end of a motor shaft, a fuel pump unit adapted to be removably mounted in said chamber, said unit including a pump shaft, pumping elements and a sealing means for said pump shaft, means to detachably secure said shaft, pumping elements and shaft sealing means together as a self-contained unit, and means to detachably secure said unit to the said end wall within the pump chamber.

5. In an oil burner, a fuel supply unit including a' housing formed with apump chamber having an end wallv and a detachable cover for said chamber, a drive shaft extending4 through-said end wall, a. pump unit including a pump shaft,

pumping elements and a sealing means for said pump shaft adjacent one end thereof, means to detachably secure said shaft, pumping elements and shaft sealing means together, and means to detachably secure said pump unit to saidend wall with said pump shaft in disconnectible engagelment with said drive shaft so that said pump 3 shaft, pumping elements and shaft sealing means may be installed or removed as a self-contained unit when said cover is removed from said housing.

6. In an oil burner, a housing provided with a pump chamber having an inlet opening and an end wall having an outlet passage, a drive shaft extending through said end wall into said chamber, a fuel pump unit adapted to be removably mounted within said chamber, said unit including a plurality of plates, pumping elements and a pump shaft, said plates housing said pumping said elements from said chamber and an outlet passage adapted to communicate with said outlet passage in said end wall, detachable means for securing said plates and pumping elements together, means for detachably mounting .said pump,v shaft in said plates including a sealing means for said pump shaft adjacent one end thereof adapted to limit movement of said shaft in one diretcion and means adjacent the other end of said shaft adapted to limit movement thereof in the opposite direction, and means for detachably securing said pump unit to said end wall with said pump shaft in dsconnectible en-- gagement with said drive shaft so that said pump unit together with said pump shaft sealing means may vbe installed or removed without disturbing the drive shaft or the inlet and outlet of said pump chamber. 4 HENRY C. ROHR.`

PETER. R. CONTANT.