US2572273A - Sheet metal gas burner with internal fuel distributor - Google Patents

Description

Oct. 23, 1951 U A. L. MILLER ET AL 2,572,273

sHEET METAL GAS BURNER WITH INTERNAL FUEL DISTRIBUTOR Filed Dec. 31, 1946 E 1L 6' lo 1254 m I I TTWWWWTF U bpvf uuz Unix I .I A \0 II g) INVENTORS AvY L. MILLER BY PARK WOOL EY nrramvzys Patented Oct. 23, 1951 SHEET, METAL GASBURNEBF INTERNAL FUEL DISTRIBUTDR Avy L. Miller, North Hollywoodrand' Park Woolley, South Pasadena, Calif., assignors to Mission- Appliance Corporation, Los Angeles, (L,alif'., a corporation of California Application December 31, 1946, Serial No. 719,514.,

3 Claims.

First, to provide a gas burnerof'the multiple j'et type which incorporates a novel means whereby equal distributionorany preselected distribution of gas to the jets may be eiiected so that thelength of'thejet flames may be uniform or produce any preselected pattern.

Second, to provide a gas burner which lends itself to production from simple stamping 3 adapted tobe welded together and is therefore particularly economical of manufacture.

Third, to provide a gas burner which by reason of its novel: gas distribution means is relatively independent of the shapeand arrangement of the mixing chamber, thereby providing a gas burner which may bedesigned to fit within a predetermined space even though the available space does not permit the use of the ideal mixing chamber configuration.

With the foregoing and otherobjects in view, reference is directed to the-accompanying drawings'in which:

Figure 1 is aside elevational view of our gas burner with the supply duct and mounting frame Figures 6 and '7 are diagrammatical' views 1 showing the effect onthe flame pattern of the change inshape of the slot or opening in the distributor plate.

Our burner, includes a pair of mixing chamber plates I which have complementary recesses so arranged that when the plates. are welded. or otherwise sealed together around the peripheries of the recesses there is defined a Venturi throat 2 which communicates with one edge of the combined .chamber plates. The throat 2 enlarges to form an expansion chamber 3 which, in turn, merges into a distributor chamber or mixing chamber 4, one end of which is folded over the expansion portion 2. The distributor chamber terminates in a relatively wide slot 5 extending approximately the length of oneof the longer edges of the combined chamber plates. The chamber plates are provided with coplanular flanges 5 bordering the slot 5.

The chamber plates are adapted to be carried.

y a suitable frame structure or support I" andla supply tube or duct 8 may extend along several of the burners and be provided; with ports 9 directed into the; throats 2; By thisarrangement, several of the burners may be arranged in parallel relation from a common support,

The flanges 6' support, a distributor plate I0 having a slot H extending the length er: the slot 5 and registering therewith. The, slot [L is narrower than the slot. 5.. and its Width. v i s for reasons which will; be broushtout herein after. 7

A burner port plate I2 is mounted on the dis.- tributor plate w. The burner port plate 1.2; is provided along its side confronting the plate It! with a; longitudinally extending channel 13 overlying the slot I 1'. Lateral burner port. channels Ill communicate with the central channel I3. The areas between the burner port channels .14 are welded to the distributor plate I 0 and the distributor plate [9 is, in turn, welded to the flanges 6' insuch a manner as to restrictthe, gas mixture, to flow through the burner port channels I41,

It isdesirablein many cases that there, be, in effect, a flame connection between the burner ports along one side of, the burner and the ports on the other side thereof; In the present instance this is eflected by an end slit 15 or end burner port which extends around the extended end of the plates IQ- and I2, this end being made semi-circular.

It is essential for eflicient operation of a multiple jet or multiple port gasburner that the length of flame issuing from each jet or burner port be equal in length to the flames issuing from the other ports. One of the reasons for this is the fact that there exists an optimum rate of flowof the gas mixture. If this flow is reduced until the velocity is below the rate of flame propagation under the conditions existingin the burner port, then the flamewill flash back. If the rate of flow is excessive, the flame will blow out. Between these two extremes the flame may be caused to burn steadily due to the fact that the rate of flame propagation in that portion burning in the air beyond the burner port is greater than the rate of flame propagation of that portion burning within the boundaries of the burner port, due principally to the relatively cooler walls of the burner port.

It therefore follows that the widest range of adjustment of, the burner flame may be obtained if the flame from each burner port is equalin length to the others. This can be seen by a comparison of Figures 6 and 7. If the flame pattern is as represented'in Figure 6, it will be seen that at the regions A and B the flame would flash back before the flame in regions C or D. Conversely, the flame in the regions C or D will tend to blow out before the flame in regions A or B.

This desired uniform condition of the flame pattern has been recognized in the past. The solution has been dependent upon careful design of the Venturi diameter, the Venturi throat expansion chamber and distributor chamber. Various baflles and other means have been introduced to eliminate high pressure regions or low pressure regions along the discharge portion of the distributor chamber, We have found that by the employment of the distributor or orifice plate I havinga slot of varying width that uneven distribution of pressure along the discharge slot of the mixing chamber can be compensated for. For example, if the flame pattern appears as shown in Figure 6, by the use of a slot ll of uniform width, then this condition can be readily corrected by widening the slot in those portions supplying regions B and by providing an enlarged opening in the extremity of the slot to supply region A. The variation in width of the slot H is exaggerated in the drawings for purposes of illustration.

By so designing the slot I I that it compensates for uneven pressure distribution, a desired uniform flame pattern may be attained even though space considerations or other factors prevent ideal design of the mixing chamber.

The distributor plate with its regulating or compensating slot enables the mixing chamber plates to be standardized irrespective of the fuel mixture to be employed, that is, whether the fuel mixture is natural or artificial gas for the proper distributor plate and burner plate may be employed to meet the optimum conditions for a given fuel without change in the mixing chamber plates.

Many other embodiments of the invention may be resorted to without departing from the spirit of the invention.

We claim:

1. A gas burner, comprising: a pair of complementary plate members each having a generally U-shaped flange-bordered depression with one side of the depression bordering an edge of said plate member, and a flange directed laterally from said edge, said plate members adapted to be joined by the borders of their depressions to define a Venturi throat expansion chamber and discharge slot, the latter being between said lateral flanges; a distributor plate overlying said flanges and said discharge slot and having a slit registering with said slot and of varying predetermined width tending to compensate for uneven pressure distribution along said discharge slot; and a burner plate overlying said distributor plate, and having offset portions defining with said distributor plate laterally directed burner ports, said burner plate, distributor plate, and flanges being secured together by means adjacent said burner ports.

2. A gas burner comprising: a pair of shell members each having a right angle flange at one margin, each of said shells being depressed and said depression extending to said flanged margin, said shells adapted to be joined in confronting relation whereby said depressions define complementarily a mixing chamber and a relatively long narrow discharge slot with said flanges extending laterally and coplanar to form a mounting surface; an orifice plate mounted on said flanges and covering said slot; a burner plate covering said orifice plate; said burner having laterally directed offset portions defining with said orifice plate a plurality of laterally directed burner ports overlying said flanges; means adjacent said ports securing said plates and flanges together; said orifice plate having .an orifice slit substantially coextensive with said discharge slot and varying in width to regulate the proportional distribution of fuel mixture from said mixing chamber to said burner ports.

3. A gas burner comprising: a pair of plate members formed from sheet metal and havin depressed portions defining complementarily a mixing chamber of generally U-form and a relatively long narrow discharge slot along the side of one leg thereof, said member having laterally directed flanges bordering said slot and forming a mounting surface; means secured to said flanges and defining a series of burner ports communicating with said discharge slot said means including means defining a slit interposed between said discharge slot and burner ports for controlling flow of fuel to said burner ports, said slit varying in width for predetermining the proportional distribution of fuel supply from said mixing chamber to each of said burner ports.

AVY L. MILLER. PARK WOOLLEY.

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

UNITED STATES PATENTS Number Name Date 752,850 McCurdy Feb. 23, 1904 959,244 Meacham May 24, 1910 1,610,542 Wilson Dec. 14, 1926 2,044,953 Palmer June 23, 1936 2,372,611 Stockstrom et al. Mar. 27, 1945 2,376,274 Pratt May 15, 1945 2,395,868 Hahn Mar. 5, 1946 FOREIGN PATENTS Number Country Date 328,738 France Jan. 23, 1903

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