US2609869A - Air admission director for oil burners - Google Patents

Description

2 SHEETS-SHEET 1 pt. 9. 1952 1'. w. MURPHY mm.

AIR ADMISSION DIRECTOR FOR OIL BURNERS Filed Dec. 2 1950 8 E N m T T A L YL 0 R mm MC WM M S AB H T p 1952 T. w. MURPHY ETAL 2,609,869

AIR ADMISSION DIRECTOR FOR on. BURNERS Filed Dec. 21, 1950 2 SHEETS-SHEET 2 INVENTORS. THOMAS W. MURPHY 8 JAMES M. CARROLL [Lwrflz ATTORNEY Patented Sept. 9, i952 AIR ADMISSION macros Fort OIL BURNERS a I Thomas W. Murphy and James M. Carroll, Narberth, Pa., assignors to Monarch Manufacturing Works, Inc., Philadelphia, Pa., a corporation of Delaware 1 Application December 21, 1950, Serial No. 201,916

This invention relates to oil burners and has particular reference to the equipment for directing and stabilizing the air in the blast tube of conventional gum type oil burners.

The general object of the present invention is to provide stabilizing equipment of simple and inexpensive construction, particularly designed for oil burners of low capacity, such as those for domestic use, though the invention may equally well be applied to oil burners of larger capacity.

The principal object of the invention is to balance the air delivered by the fan supplying the air for combustion so as to produce high CO2 content of the flue gases with a clean flame.

Another object is to so stabilize the air delivered to the sprayed oil that the flame produced by a present day smaller capacity nozzle, handling for example about one-half gallon of oil per hour, will not be extinguished even though the full volume from the fan is delivered to the stabilizing equipment, when the fan and same stabilizing equipment is normally capable of delivering sufiicient air for combustion of at least two gallons of oil per hour, which is the critical test of proper air balance. The air balance is obtained by having the combustion air delivered to the stabilizing equipment under relatively high static pressure, with the stabilizer so constructed as to direct the greater volume of air spirally and peripherally of the stabilizer and with a lesser volume of air directed substantially centrally of the first mentioned air volume but in counter current to the peripheral air volume, and in such controlled proportion that the two forwardly moving swirling columns of air will converge rearward of the converging cone ring and be delivered therethrough with sprayed oil for combustion.

The foregoing indicated objects as well as those particularly relating to details of construction and operation will become apparent from the following description read in conjunction with the accompanying drawings, in which:

Figure 1 is an axial section through a burner embodying the invention showing the stabilizer and associated parts in side elevation;

Figure 2 is an end elevation looking at the exit end of the cone ring;

Figure 3 is a vertical section taken on the plane the trace of which is indicated at 33 in Figure 1;

Figure 4 is a side elevation, partly in section, showing in particular details of the stabilizer assembly;

Figure 5 is an elevation looking at the righthand side of Figure 4; and

Figure 6 is an elevationlooking at the left-hand side of Figure 4. Aconventional oil burner air tube is indicated at 2 to which air is supplied by means of the fan or blower 4. A conventional locking arrangementat the rear of the air tube indicated at 6 supports the oil feed line 8 which terminates in a nozzle ID of conventional construction.

A cone ring i2 is secured within the end of the air tube by screws [4 and is provided with a smoothly curved converging inner surface 16 which forms an-angle with theopening l8. With the construction aboutto be described, the cone ring should havea smooth inner surface of rotation, such as indicated at l6, without vanes.

A spider indicated at 20 is secured to the oil pipe 8 by means of a set screw and is provided with a pair of arms 22 which are bored to provide a mounting for the insulating tubes 24, which are clamped therein and which support the ignition electrodes 26.

A second pair of arms of the spider indicated at 28 serve for the mounting of the stabilizer assembly to the oil tube, the mounting being afforded by means of bolts passing through the ends of the spider arms and the assembly with interposed spacers 30.

The stabilizer assembly is particularly illustrated in detail in Figures 4, 5 and 6. It comprises a plate 32 which is stamped to provide outer blades 34 which are twisted to form helicoidal vanes for imparting spin to the air, and also stamped to provide an inner series of blades indicated at 38 which are so arranged as to impart spin to air passing between them in a sense opposite to the spin imparted by the blades 34. Surrounding the blades 38 there is a generally cylindrical short tube indicated at 40, and is provided with a flange 42 riveted to the plate 32. Within a central opening in the plate 32 there is secured by means of a flange a tubular member 44 provided with a bore 46 for the reception of the body 48 of the nozzle I0. As will be evident from Figure 4, there is provided by the members 44 and 40 an annular space into which there is discharged the air passing through the blades 38.

In particular, the member 40 provides a. barrier between the flows passing through the blades 34 and the blades 38, respectively. The plate is provided with openings 50 for the passage of the insulating tubes 24 and the flange 42 is notched as indicated to clear these tubes. As will be noted, the insulating tubes terminate substantially coextensively with the outer end of the member 40.

The arrangement just described provides inner and outer currents of air which are r'eversely rotating and which provide the proper flow to secure maximum efficiency of combustion.

The mechanical construction of the stabilizer assembly is not only inexpensive but quite rigid and it will be noted that the outer ends of the blades 34 lie in a cylindrical surface which is only slightly less in diameter than the inner diameter of the air tube thus providing a support for the 7 with openings for the passage of insulating tubes nozzle end 01 the oil feed line to maintain the;

nozzle in accurate axial alignment; with the air:

tube and the outlet 18.

What is claimed is:

1. A stabilizer assembly for, an oil burner comprising a sheet metal plate, said plate having its periphery formed and shaped to provide an outer annular array of substantially helicoidal sheet metal vanes to impart rotationv torair flowing therebetween, having an inner; portion formed and shaped to provide an innerannular arrayof substantially helicoidal sheet metal vanes to impart rotation to air flowing therebetween in a direction opposite to that impartedby the outer vanes, having an annular: blank portion separating the two vaned annular portions-and.- providedwith openings for thepassageof insulating tubes for ignition electrodes,v and having; a blank portion within the inner vanes provided: with a central opening for the passage of a fuelnozzle assembly, anda substantially cylindrical member extending axially of; the plate fromthe blank annularportion thereof in thev direction of: airflow to providea'barrier separating; the oppositely rotating air flows.

2; A stabilizer assembly'for-anoil burner com-- prising a sheet metal plate, said plate having its for ignition electrodes, and having a blank portion withinthe inner vanes provided with a centralopening for the passage of a fuel nozzle assembly, and asubstantially cylindrical member extendingaxially of the plate from the blank annular portion thereof radially inwardly of the ignition electrode openings therein and in the direction of air flow for an axial distance equal toless than the diameter of the stabilizer assembly to providea barrier separating the oppositely rotating air flows,

THOMAS- W; MURPHY. JAMES M. CARROLL.

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

UNITED STATES PATENTS- Smith 1 Apr. 17., 1951

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