US1539093A

US1539093A - Gas burner

Info

Publication number: US1539093A
Application number: US670770A
Authority: US
Inventors: Lee B Mettler
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-10-25
Filing date: 1923-10-25
Publication date: 1925-05-26
Anticipated expiration: 1942-05-26

Description

May 26, 1925.

L. B. METTLER GAS BURNER Filed 001' 25, 1925 ATTORNEY,

INVENTOR: LEE: B. ME-n'll/AV.

Patented May 26, 1925.

' LEE B. METTLER, DE LOS ANGELES, CALIFORNIA.

GAS BURNER.

Application filed Octolbr 25, 1923. Serial No. 670,770.

To an it may concern Be it known that 1, Lin: B. METTLER, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Gas Burners, of which the following is a specification.

My invention particularly pertains to improvements in the multiple type of gas burn: ers of the class which are especially adapted for use in boilers, in furnaces and in combustion chambers in general.

An object of my invention is to provide a burner embodying .a multiple 7 arrangement of gas and air mixing tubes by means of which it is adapted tooperate economically with fuel gas under a wide range of pressures, and Without the necessity of supplying secondary air.

Another object is to provide a gas burner embodying air and gas mixing tubes 'in which air is entrained into a stream of gas at an acute angle within the mixing tubes,

thereby insuring a thorough intermingling of the gas and air at their critical point of mixture, and which burner has associated therewith means for affording a proper air regulation.

Another object is to provide a gas burner which is simple in construction and which is adapted to be readily installed.

A further object is to provide a gas burner which is so constructed as to provide a highly efficient gas burner unit of large capacity relative to its size.

With the foregoing objects in view, together with such other objects and advantages as may subsequently appear, my invention resides in the parts, and in the construction, combination and arrangement of parts, or the equivalents thereof, hereinafter described and claimed, and illustrated by way of example in the accompanying drawin in which i igure 1 is a view in front elevation of my assembled gas combustion burnerwith parts broken away, showing the air-regulating means.

Figure 2-is a view in section and front elevation as seen on the line 22 of Figure 3, showing the mixing plate and gas distributor with parts broken away.

Figure 3 is a view in cross section and side elevation of the burner, showing it as applied to a furnace,and illustrating the manner of entraining. air an acute angle.

Figure 4 is a perspective view of the gas distributor.

Figure 5 is a view showing a modified form of the mixing tube.

Figure 6 is a detail in section illustrating a modified form of the burner nozzle showing it as' adapted to streams of fluid fuel.

More specifically A indicates the wall of a furnace which is provided with the usual fire box B, and which wall is formed with an opening 2 into which'is placed a mixing plate 3 preferably formed of cast iron but which may be made of any other suitable metal. The plate 3 embodies a central parinto the gas at tition 4 formed with forwardly and rearwardly extending marginal flanges 5 and 6, which flanges abut against the walls of the opening 2. The central partition 4 of the mixing plate is provided with a series of funnel-shaped air intake openings 7 the walls of which project outward from the front face of the partition." The openings 7 have their largest diameter at a point forward of the partition and have their smallest diameters terminating on a line approxidischarge multiple mately midway of the partition. Annular flanges 8 are formed on the rear of the partition and project from the margins of the small ends of the openings 7. The mixing plate is outwardly extending walls of the openings 7 form the outer wall of a square .socket or depression 9 into which is inserted a gas manifold 10 which is of a general square contour to seat into the socket 9. The gas box is provided with a plurality of. integral tubes 11 forming gas outlet passages, which tubes radiate from the box 10 and arebent at right angles at their outer ends to form tapered nozzles 12, as is more clearly shown in Figure 4. The radiating tubes 11 are so formed and arranged that the nozzles 12 thereon will extend into the air intake openings 7, there being a nozzle for each opening. Each nozzle '12 terminates and delivers the as on the centerof the funnel shaped air intake opening 7 on an approximate line with the termination of the funnel at its smallest diameter. A hole 13 is provided in the rear wall of the gas box 10 and the center of the socket in the mixing plate is also provided with a hole so cast that at its center the gas box and the gas mixing plate in rigid relationship. The forward end of the gas box is provided with a circular opening in which is screw threaded a gas supply pipe 16.

The flange 5 of the mixing plate surrounds and supports a refractory block 17 preferably formed of silicon carbide; the refractory block being formed with apertures 18 which register with and correspond in size to the small ends of the funnel shaped openings. These apertures constitute mixing chambers or passages and are of such length as to bring the gas from the nozzle to a critical point of the mixture with the entrained air before the mixture reaches the firing point in front of the block. The block is provided with as many apertures as there are air openings in the mixing plate.

The aperture 18 of the refractory block may be formed to slightly diverge from the inner section in the air passage, giving a Venturi tube effect as shown in Figure 5.

The opening 2 is fitted with a frame and door construction which embodies a door frame 20 having an apertured depending wall 21, apertured to pass over the gas pipe 16; the wall having marginal flanges 22 which extend into the furnace opening 2. The door frame and the gas pipe are connected together by a screw 24. The lower edge of the door frame is providedwith outstanding lugs 25 and the lower edge of the door is provided with lugs 26, the

lugs

25 and 26 abutting and being apertured to receive a bolt or screw to form a hinge mounting for the door 27; the door being of a general U-shaped character and adapted to swing into completely closed or opened position without binding against the gas supply pipe 16. The outer side of the door near its upper edge is provided with a pin 28, and the door frame 20 is provided at its side and near the upper edge with an outstanding lug 29 to which is pivoted,-as at 30, a notched bar 31. any one of the notches of which is adapted to be placed over the pin 28. This arrangement of pivoted notched bar and pin provides means for regulating the amount of air delivered to theburner.

The accompanying'drawings show a combustion unit in which the general contour is square, so constructed to be inserted in a furnace door with a square opening, but it is to be understood that the combustion unit can be constructed in any desired shape .to correspond with the shape of the opening in the furnace.

From the foregoing it will be seen that I have provided a gas burner which embodies a multiple of independent gas and air mixing elements, which are arranged close together and open horizontally into a fire box around a common center. By this arrangement the gas delivered to the burner from the supply pipe 16 is divided into a plurality of fine streams each of which is discharged into a separate mixing passage where it becomes thoroughly intermixed with air before being delivered to the fire box; each gas stream on its discharge from a nozzle acting to draw air into the mixing passage through the funnel-shaped air intake opening, the inclined walls of which opening serve to direct the air into the gas at an acute angle, which insures proper mixture of the air and gas. In this manner a more complete intermingling of gas and air is ctiected than would be the case where a volume of gas corresponding to that discharged from the plurality of nozzles is discharged from a single nozzle, thus insuring practically complete combustion.

The door 27 serves as a means for regulating the air feed to the several mixing chambers. and. enables the supply of a proper flow of air in proportion to the volume of gas discharged from the nozzle.

The refractory block serves to protect the metal of the mixing plate and the burner manifold and distributing pipes from the intense heat of the flames in the fire box.

In some instances the nozzle 12 may be formed as shown in Figure 6, that is, with a plurality of angularly disposed outlet apertures 33 so arranged as to direct multiple streams of the fuel diagonally into the mixing apertures 18 so as to effect a greater admixture of the fuel and the entrained air.

I claim- 1. In a gas burner. a plate formed with a series of air intake openings having tapered walls, a gas supply manifold, a'series of radiating tubes on said manifold, nozzles on said tubes arranged to discharge gas centrally of the air intake openings, a refractory block extending over said plate said block being formed with apertures which register with the small ends of theair intake openings which apertures constitute a multiple of gas and air mixing chambers.

2. In a-gas burner, a plate formed with a series of air intake openings having tapered walls. a gas supply manifold, a series of radiating tubes on said manifold, nozzles on said tubes arranged to discharge gas centrally of the air intake openings, a refractory block extending over said plate said block being formed with apertures which register with the small ends of the air intake openings which apertures constitute a multiple of gas and air mixing chambers, and means for regulating the flow of air to the air intake openings collectively.

3. In a burner of the character described, a metallic plate having a depression on one III 2 fold seating on said plate on the side thereof a spaced thereby from the side thereof and formed with a Series of air inlet openings arranged around said depression, a refractory block covering said plate having a series of apertures registering with the openings in the plate and constituting mixing chambers, a box-like gas manifold seated in the depression, a series of radiating tubes leading from said manifold, and nozzles on the outer ends of said tubes extending into the openings in said plate.

4. In a burner of the character described, a metallic plate having a series of air inlet openings therein formed with marginal flanges. a refractory block covering one side of said plate and seating on said flanges and face of said plate said block being formed with apertures registering with said openings, a gas maniopposite said block, and a Series of nozzles communicating with said manifold and extending into the openings in said plate.

5. In a burner of the character described, a plate formed with oppositely" extending flanges on its margin, said plate being formed with a series of oppositely extending flanges on the margins of said openings, a refractory block covering one side of said plate and carried by one of the marginal flanges thereof, said block seating against the flangesprojecting from one side of the plate around the openings therein, said block being formed with apertures registering with the openings in the plate, a gas manifold. and a series of gas nozzles'carried by said manifold extending into the openings in said plate and spaced from the flanged margins thereof.

LEE B. LETTLER.

air inletopenings,