US2641189A - Liquid fuel burner - Google Patents

Description

E H HAUGEN LIQUID FUEL BURNER June 9, 1953 Filed Jan. 28, 1949 June 9, 1953 E. H. HAUGEN LIQUID FUEL BURNER Filed Jan. 28, 1949 INVENTOR. Edmond h. Haugen Patented June 9, 1 953 UNITED STATES rPATENT OFFICE LIQUID FUEL BURNER Application January 28, 1949, Serial No. 73,320

'l Claims.

This invention relates to liquid fuel burners and is particularly concerned with novel conn struction of a rotatable liquid fuel distributor for dispensing oil or like liquid fuel to be mixed with air and burned at a iiame rim disposed about the burner.

This is an improvement on the burner construction illustrated in United States Letters Patent No. 2,515,262 issued July 18, 1950, the particular improvements consisting in details of construction and methods of assembly of the ro'- tating distributor as will be hereinafter described in detail.

It is therefore the major object of my invention to provide a novel iiuid fuel burner distribu tor construction and method of assembly which is speedy, efficient and inexpensive, and provides improved accuracy of relation of the parts, thereby producing a burner rotor assembly which is accurately balanced and has long life in operation without replacement or repair.

A further object of the invention is to provide a structure and method of assembly of a liquid fuel distributor wherein the flinger tubes are secured to the head in a novel manner.

It is a further object of my invention to provide an improved liquid fuel distributor and method of assembly wherein the cone which lifts liquid fuel to the level of the dinger tubes during rotation of the distributor is assembled with the distributor head in a novel manner.

A further object of the invention is to provide a novel liquid fuel burner distributor and method of assembly wherein each flinger tube has its lower portion press tted into a suitable aperture in the distributor head with its lower end fiared within the head to aid in anchoring the head and tube in a tight substantially permanent assembly.

It is a further object of my invention to provide an improved liquid fuel distributor and method of assembly wherein the liquid fuel lifting cone is press tted within the distributor head in accurate alignment therewith, and anchored; thereto in anovel manner.

Further objects of the invention will presently appear as the description proceeds in connection with the appended claims and the annexed drawu ings wherein:

Figure 1 is an axial vertical section through a liquid fuel burner constructed according to a preferred embodiment of the invention, illustrating the assembled distributor;

Figure 2 is a fragmentary enlarged section illustrating the manner in which the lower end of each' flinger tube'is anchored within 'the' distribiitor head, and the head construction whereby the upper end of the cone is press fitted within the head and maintained there by a retainer ring;

Figure 3 is a fragmentary bottom end view of the iiinger tube anchoring bore in the head, illustrating the V-grooves in the ytapered rim;

Figure e is a fragmentary section illustrating how the metal from the lower ends of the iiinger tubes is forced into the V-grooves in the assembly; and

Figure 5 is an exploded View in section iilustrating the manner of assembly of the parts.

Referring to Figure l, the burner of the invention is supported by a suitable upright stand i I and is mainly enclosed within a housing comprising a lower cupwshaped motor casing i2 and an upper annular collar I3, both of which are se cured to the stand and each other as by welding a clown-turned rim lli on the collar to stand ii and by means of a bolt and wing nut assembly l5 extending between the collar and casing if.

The burner motor is an electric motor indi cated at i6 and is supported by a suitable resilient bushing Il which is mounted on the aberm tured lower wall I8 of motor casing l2. Bushing Il is centered with motor casing I2 and comprises an annular body of rubber iii compressed between inner and outer metal shells 2i] and 2i, the inner shell 2l) being rigidly press fitted upon the cylindrical portion 22 of a core member Theouter shell 2| has secured thereto a clamp band 24 formed with a radially projecting fiange 25 adapted to overlie wall i8 of the motor casing when the motor assembly is seated within casi ing i2.

Above its cylindrical portion 22, core 23 formed with a radial flange 25 for supporting the stator of the electric motor including the laminated core 21 and field coils 28, these being secured to flange 26 as by machine screws Above upper coil 23, an inverted cupnshaped collar at is press fitted over the top of the core 25, being apertured to clear the rotatable distributor. A pin 3l rigid with flange 26 projects downwardly through a rubber grommet 32 in motor casing wall I8 to thereby resiliently restrain the entire motor assembly, which rests by its own weight on bottom wall i8 of casing i2, from turning about the vertical axis of the distributor during operation. The above desirable structure and resilient mounting of the motor assembly is described and claimed in said Letters Patent No. 2,515,262 to which attention is directed for detail.

The entire distributor head assembly comprising the fan 33, the distributor head 3A., flinger tubes 35'and 36, shaft 31 upon the upper end 'of which fan 33 is secured as by screws 38 and the oil lift cone 39 is removable as a unit from the assembly by pulling it straight upwardly through the aperture in collar I3.

As illustrated in Figure l, the upper part of core member 23 is internally threaded to receive the lower end of a sleeve 4I that extends upwardly to about the level of the top of the stator core for receiving the shaft 31 and providing a long internal cylindrical bore #lf2 foi sup porting the shaft in a truly upright position during rotation.

An annular integral collar i3 on core flange 26 extends upwardly parallel to sleeve ci to terminate a short distance below the top of the sleeve and form therewith an annular well i4 for collecting oil to be lifted to the fiinger tube ny the cone 3S during rotation as will be described.

Oil is supplied to well 4d through a conduit ntting d5 opening into the bore 45 in the lower part of core 23, and bore 46 is enlarged at 41 to receive a compression spring 48 that supports a fiat hardened steel washer i9 just below the lower end of sleeve I and is adapted to serve as a thrust bearing upon which rests the ball bearing lower end of shaft 31. From bore d5, oil flows upwardly through channels 5I in core member 23 and through radial slots 52 in flange 25 into the bottom of well 4d in which the level is preferably maintained by a suitable gravity feed and level arrangement (not shown).

The distributor head 35 comprises an inverted cup-shaped member which is preferably a machined metal casting, Head Sli comprises an eX- ternal conical shoulder 53 which terminates in a cylindrical portion 54 and a radial flange 55. Inwardly of flange 55, head 3d is machined to provide a cylindrical wall 55 and a smaller shorter cylindrical wall 51 in longitudinal succession. Upwardly of wall 51', head 34 is formed with an internal conical wall 53 generally parallel to shoulder 53.

Head Sli is formed with two diametrically cp posits bores 53 and Gil which are inclined at equal angles, about 18 to 'the vertical. As illustrated in Figures 2 and 3, bore 55 is formed at its lower end with an enlarged `conical countersunk rim GI in which are indented a series, preferably three, of V-grooves 62 that increase indepth and width outwardly of the axis of the bore. Bore [it is similarly terminated, and the purpose of these grooves will be later explained.

The lower ends of 'tubes 35 and 313 areshouldered at 53 to seat squarely on wall 153 and provide reduced thin-walled end portions Si', that press fit into bores 5g and Sli. In assembly, each dinger tube pressed 'into its bore 59 and Si), and then the end of the tube is ared outwardly against the rim 5i. As illustrated in -Figure 4, some of the lmetal of the tube end is forced into the grooves 52 during thisoperatio'n, and the lower ends of the tubes are thus enlargedand anchored to restrain them against both longitudinal and rotational movement in the bores.

Cone 39 is press fitted within head 311 Ywith its outturned cylindrical end flange -65 machined to nt tightly within the wall surface 5`I so that when the cone advances into the head its flange 65 vwill be press ittedwith'the wall 51. VIn crder to securely retain the cone'within the head, additional securing means .is provided in the form of an `annular cylindrical attachment ring 66 press fitted within the wall 56 with its upper end tightly .engaging the -under side of cone flange 65. This manner of securing the cone within the'head dis- .penses with the hitherto used silver soldered connections and provides a mechanical securing operation Which is efficient and sure and which both accurately locates and retains the cone in assembled axial alignment with the central shaft receiving bore 61 of the head that is coaxial with walls 56 and 51.

Shaft 31 which is laterally supported by bore 42 is formed with spaced bearing surfaces 6B and 59 that fit bore 42 with a rotating running clearance. Lower bearing surface S8 is formed with a helical surface groove 1I that tends to lift oil up into the interior of the sleeve and lubricate the bearing surfaces at 58 and 69. The distributor head 34 is press tted on the upper portion of bearing surface 65 well above the upper end of sleeve 4 I. The motor rotor 12 is secured to ange 55 as by machine screws 13 in surrounding relation to the collar 43.

Cone 39 carries an oil slinger ring 14 and a surge prevention ring 15. These rings are press ntted upon machined cylindrical surfaces 16 and 'I1 respectively on the outer surface of the cone prior to assembly of the cone with head 34.

The method of assembling the distributor of the invention is novel and produces an accurately aligned and centered assembly.

The rst operation, after machining head 35, to provide bores 5B, Bil and 61 and surfaces 5G and 51 of proper diameter, is to assemble the dinger tubes with the head. rhis is accomplished as above explained, by inserting the tube ends Bxl into press fit relation with bores 5e and Gli and spinning over the inner ends of the tubes onto rims 6 I.

Next the cone 39 with the peripheral surface of flange S5 formed to size is inserted into the cup of the lower part of the head 3d. Prior to insertion, cone 39, which is preferably a sheet metal stamping, is machined at iiange 55 to provide a cylindrical circumferential surface 18 for press fit with surface 51 and a fiat annular top surface I9 that abuts against an internal ledge SI above surface 51 when the cone flange has been pressed into the position of Figures 1 and .2. Cone stamping 39 is also machined to provide cylindrical surfaces 16 and 11 for press lit of the slinger and surge prevention rings prior to incorporation of the cone assembly with head 34.

Preferably the cone assembly and head 3l? are suitably, slidabiy and coaxially mounted with the cone on a suitable mandrel 82 having a part 83 extending through 'bore (il and a larger diameter S4 to suit the lower cone opening, and While so maintained and guided in accurate alignment they are pressed together until surface 19 contacts ledge 8I. Then the attachment ring 66 is pressed into surface 55 until its inner end abuts flange 55. Preferably ring 66 has the same axial length as surface 56, and it reenforces the joint between the head and the cone assembly.

Then the shaft 31 is press fitted into bore 61 and head `34 is located properly with respect to the fan and bearing ends of the shaft. 'Preferably this operation takes place while the head is in the same fixture as in pressing the cone into place. Now head flange 55 vis machined to seat the motorrotor 12, the rotor attached to the shaft and fan 33 mounted on 'the shaft and the entire rotatable assembly is ready to drop into the stationary part of the burner.

Thus the several parts of therotor assembly are all press fitted tightly together, without thenecessity of silver solderedor brazed connections ,as heretofore wasthe case. This understandably a less expensive method of assembly but it also unexpectedly provides a considerably more accurate assembly particularly with respect to alignment of the cone and shaft axes. parts had to be heated during assembly operations, as in soldering and brazing, there was a tendency toward Warpage of the relatively thin metal cone and consequent misalignment with the shaft when cooled, and this is absolutely prevented by the process of the invention.

This advantage of accuracy of alignment and prevention of cone warpage is obtained by press fitting the slinger and surge prevention rings onto the cone instead of soldering them in place as previously was the practice. The spinning over of the lower inger tube ends provides an anchorage that is superior to the hydrogen brazed attachment heretofore employed, and insures against misalignment of the tubes with respect to the shaft 3l.

Ordinarily all of the rotor parts are rust proofed with a gun metal finish before assembly.

The distributor shaft is preferably machined to final shape and then hardened before assembly with head 34. Because it is easier to machine prior to hardening, groove 1| is therefore more accurately cut and it provides an improved positive pumping action. Preferably also the upper end of the shaft 3l is relieved to permit more accurate aligned assembly of the head and shaft, this preventing broaching of the head and enabling the shorter bearing surface 69 to be held to more accurate dimensions.

I have therefore provided a novel distributor rotor and method of assembly which contributes to a more accurate, uniform distribution of the oil spray for a wall flame burner and the accurately related and balanced parts provide a quietness of operation over a long life that has hitherto been not obtainable.

The invention may be embodied in other specil-lc forms without departing from the spirit or essential characteristics thereof. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicatedby the appended claims rather than by the foregoing description, and al1 changes which come Within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Where these" What is claimed and desired to be secured by United States Letters Patent is:

1. In a fuel oil burner, a rotor comprising a head, angularly disposed oil flinger tubes secured upon said head, a central shaft secured to said head, an oil lift cone having its upper end press fitted into said head, and an attachment ring for said cone press fitted into said head into abutment with said cone.

2. In the fuel oil burner defined in claim l, said cone being formed at its upper end with an outwardly directed flange that is press fitted into abutment with the correspondingly formed lower end of said head, and said attachment ring clamping the cone fiange against said head.

3. In a fuel oil burner, a rotor comprising a head having a central vertical bore and equally spaced angularly disposed bores, angularly disposed oil flinger tubes secured in said spaced bores, a shaft press fitted into said vertical bore, an oil lift cone surrounding the shaft and having its upper end press fitted within said head, an attachment ring for said cone press tted into said head into abutment with the cone, and an oil slinger ring press fitted onto the periphery of said cone intermediate its ends.

4. In an oil burner, an inverted cup-shaped head having a central bore and two diametrically opposite inclined side bores, the interior of said cup being formed with a bottom surface surrounding said central bore and intersected by said inclined side bores and an adjacent cylindrical side surface coaxial with said central bore, an oil lift cone having an upper flanged end press fitted with said cylindrical surface, and an attachment ring tight with said head abutting against said ange for securing said cone against axial displacement with respect to said bore.

EDMOND H. HAUGEN.

References Cited in the file of this patent UNITED lSTATES PATENTS Number Name Date 1,058,542 Brown Apr. 8, 1913 1,883,906 Hasselquist Oct. 25, 1932 1,888,693 Powers Nov. 22, 1932 2,181,249 Powers Nov. 28, 1939 2,310,333 Wilson et al. Feb. 9, 1943 2,515,262 Powers July 18, 1950

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