US1737232A - Combustion tube for oil burners - Google Patents

Description

. Nov. 26, 1929. w. M. GRIFFIN COMBUSTION TUBE FOR OIL BURNERS Filed se t. 24, 1928 2 Sheets-Sheet 1 Fig. 2.

INVENTOR ATTORNEY Nov. 26, 1929.

W. M. GRIFFIN COMBUSTION TUBE F OR OIL BURNERS 2 Sheets-Sheet 2 INVENTOR d. M MP ATTORNEY Filed Sept. 24, 1928 Patented Nov. 26, 1929 UNITED STATES PATENT OFFICE WILLIAM GRIFFIN, or FOR WAYNE, mmANAfAs 'IeNoE To 'I'HE WAYNE HOME EQU PMENT COMPANY, or BALTIMORE, MARYLAN LAND ooMEUsTIoN TUBE A CORPORATION OF MARY- Eon OIL BURNERS Application filed September 24, 1928. Serial No. 308,012.

My invention relates to apparatus for burning liquid fuel, and particularly to the combustion tubes of such apparatus. The invention may be used on oil burners of relativel small size, such as those for heating dwel 'ng houses and for larger installations.

To ensure safe and efiicient'combustion of the fuel, the rearward part of theflame must be maintained a short distance in front of the burner. nozzle. If the flame rests upon or surrounds the end of the nozzle, carbon deposits will soon partially or wholly close the fuel outlet orifice,or accumulate on the nozzle so as to re ent normal discharge of air from the com ustion tube, or interfere with ignition, or all of these. If the flame ismaintained too far forward of the end of the nozzle, it is apt to be blown out; whereupon normal continued feed of fuel upon the heated firebox wall is liable to cause an explosion.

This invention constitutes an improvement on the invention of Harry F. Smenner, application for Patent Serial No. 307,988, filed. September 24, 1928.

While an ample quantity ofair must be provided I have found that it is very important that the air supplied to the combustion tube should be so directed that it will not pass directly over the flame.

The principal object of my invention is to so direct the air entering the combustion tube that it will not flow directly over the spray nozzle. In fact I prefer that it be deflected backwardly, that is, away from the front end of the combustion-tube upon entering said tube. A device so constructed produces safe and efiicient combustion regardless of the exact position of the spray nozzle with relation to the inner end of the combustion tube and therefore but slight care need be used in assembling the oil tube and nozzle in the combustion tube.

A rotating air supply f ed thru the wall of the combo ion tube, toward the back end thereof maintains a rapidly rotating tubular air column, constantly emerging from the front of the combustion tube, with substantially no air pressure at the center where the spray nozzle is located.

Two embodiments of my invention are illustrated in the accompanying drawings, in which Figure 1, is a perspective from above the combustion tube with the burnerassembled therein, comprising a main tube and branch tubes connected with the main tube tangentially, one to the top side and the other to the bottom side, the back endof the tubes being broken away,

Fig. 2, is a cross section of the tubes only, on the line 2-2 of F ig. 1, and

Fig. 3 is a longitudinal section of the tubes only, on the line 3-3 of Fig. 2,

Fig. 4 is a top plan view of another form of the combustion tube and burner assembly with the rearward ends of the'connections broken away. The combustion tube proper and air supply tube are two parallel tubes formed integrally and tangentially connected,

Fig. 5 is an end view of the combined combustion and air supply tube from the rear,

Fig. 6 is a cross section of the combined combustion and air supply tube only on the line 6-6 of Fig. 4,

Fig. 7 is a longitudinal section of the combined combustion and air supply tube only on the line 7-7 of Fig. 5,

Fig. 8 is a longitudinal section on the line 8-8 of Fig. '5.

Referring now to the drawings and particularly to Figs; 1 to 3 inclusive; 1 is the I main combustion tube, with branch tube 2, closed at its front end, connected with the main tube tangentially on the under side of the main tube, and branch tube 3, also closed at its front end, connected with the maintube tangentially on the top of the main tube, so that air forced into tubes 2 and 3 from their rearward ends will rotate within the main tube 1, around thburner nozzle 5 as indicated by the arrows. Electrodes 6, 6 are conveniently located to supply initial ignition.

' Obviously the branch tubes need not be connected to the main combustion tube directly opposite each other, and if one was so connectused if more than two air currents were desired.

The preferred form of the device is shown in Figs. 4 to 8 inclusive, and Wlll now be described. The main combustion tube 14 has a parallel air suppl tube 15 closed at its front end, both tubes pre erably formed of one casting with a tangential ogening from the latter to the former at 16. I his opening may be coextensive with their joint length or a. less distance. In the drawings it has been shown as extendin from a partltion 17 to the front end of the air supply tube 15 with a cross partition 18 of suitableheight to prevent all the air supplied to the tube 15 from the rear 19 impinging upon the front end 20 of said tube, but will divert part of the air to the mam tube 14 in a separate current. Obviously I there might be a plurality of such partitions 2o 18 and of'ditferent heights if desired, if more than two such streams of air into the m'am tube from the air supply tube are desired.

Partitions 17, 18 and 28 are all inclined backwardly, that is so as to divert the air entering I the combustion tube 14 toward the back of said tube.

An'axially adjustable housing 21 complete- 1y closes the back end of the main tube 14.

Through this housing extend the electrodes 6 and 6" and the fuel oil supply tube 22, the

inner end of which terminates in the spray nozzle 5.

An opening through the side of the main tube, is closed by a mica window 23'and is pro- 5,tected externally by a window housing 24, having a hinged guard door 25, which may be raised to observe the conditions on the insideof the fire- 0t (not shown).

The combine main tube and air supply tube may have a longitudinal passage 26 to supply air direct from outside the fire-pot to its interior and the su ply of direct air therethrough is regulated y the adjustment of the position of the cover plate 27.

Although certain forms of the invention have been shown and described it will be understood that a mechanic, worliing within the scope of what is claimed, may makechanges, without departing from the spirit of the invention. I claim as In invention and desire to secure by Letters atent of the United States 1. In a combustion tube for apparatus for burnin liquid fuel, means for supplying air throng the wall of said tube substantially tangentially thereof and means for diverting plaid toward the back end of the combustion tu 3. In a combustion tube for apparatus for burning 1i uid fuel, a fuel supply pi e and its spray nozz e positioned substantial y axiall of said tube, means for supplyin air throug the wall of said tube substantialg tangentially thereof and contiguous to said nozzle, means for dividing the air current so supplied and means for diverting the air so supplied toward the back end of the combustion tube.

4. A combustion tube for apparatus for burning 1i uid fuel, and an air su ply tube closed attlie front end substantia ly parallel with the combustion tube and connected therewith substanially angentially of said combustion tube, and internal partitions sloping backwardly to cause the an enterin the combustion tube from the air supply tu e. to flow toward the back of said combustion tube.

In testimony whereof I have hereunto set my hand.

WILLIAM M. GRIFFIN.

the air so supplied toward the back end of the combustion tube.

2. In a combustion tube for apparatus for burning liquid fuel, a fuel supply pipe and its spray nozzle positioned substantially axial- 1% of said tube, means for sup lylng air t rough the wall of said tube su stantially tangentially thereof and contiguous to said '65 nozzle and means for diverting the air so sup-

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