US1754761A - Locomotive boiler - Google Patents

Description

April 15, 1930.

A. W. NELSON LOCOMOTIVE BOILER Filed June 18, 1928 3 Sheets-Sheet 1 5 Sheets-Sheet 2 Filed June 18, 1928 mm W NW m IIIILIII l filllkllil April 15, 1930. v w, NELSQN 1,754,761

I LOCOMOTIVE BOILER Filed June 18, 1928 3 Sheets-Sheet 5 Patented Apr. 15, 1930 UN] TED STATES P ATE NT OFFICE ARTHUR WM. NELSON, 'OF PARK RIDGE, ILLINOIS, ASSIGNOR TO LOCOMOTIVE FIRE- BOX COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE LOGOMOTIVE BOILER Application filed June '18, 1928.

This invention relates to improvements in locomotive boilers and especially to those having that type of firebox wherein fuel such oil is burned and it consists of the matters hereinafter described and more particular] pointed out in the appended claims. One of the objects of the present invention is to provide in a boiler of this kind, a pair of flat tubular water walls in the firebox 1 thereof, which are connected at their inner rear corners with the boiler barrel and at their outer front corners with the crown sheet of the firebox, whereby a larger superficial heating area is provided and the water steaming and circulating efficiencies of the boiler are materially increased.

The above mentioned objects as well as others, together with the many advantages thereof will more fully appear as I proceed 20. with my specification.

In the drawings Fig. 1 is a longitudinal vertical sectional view through the firebox end of a locomotive boiler embodying my invention.

Fig. 2 isahorizontal sectional view through the same as taken on the line 2-9. of Fig. l with the firebriclr, burner and associated parts omitted to better disclose the construction and arrangement of the water heating 2e and circulating elements.

Fig. 3 is a transverse vertical sectional view through the firebox end of the locomotive boiler as taken on the line 3-3 of Fig. 1.

Figs. 4 and 5 are transverse vertical detail sectional views through parts of the boiler and firebox onan enlarged scale as taken. on the lines. H and 55 respectively of Fig. 1.

Referring now in detail 'to that emb0diment of the invention, illustrated in the accompanying, drawings, 1 indicates as a whole thebarrel ofthe boiler in which are arranged the usual times 2. The firebox of the boiler is formed by the flue sheet 3, rear sheet 4,

, side sheets .5 5 and crown sheet '6, all connec'ted together. in the manner well known.

In this instance the bottom portion 3 of the flue sheet forms the throat sheet of theiire 50' box. y Y v I i Serial No. 286,444.

The firebox wrapper comprises the top plate 7,theside plates 88, the outside throat plate 9 and outside back plate 10. The wrapper just described, together with the fire box sheets before mentioned, define the several water legs of the boiler, i. e., the side legs 1111, the front leg or throat 1 2, and back leg 13 all closed at the bottom by the usual mud ring 14. The firebox sheets are joined to the wrapper plates by means of stay bolts 15 in the manner well known. '16 indicates a door opening which is normally closed by a door not shown), and this opening provides the fuel door Opening in 'case the firebox is converted into a coal burner as is sometimes necessary and which conversion may be readily made with but comparatively small expense.

In the middle bottom portion of the firebox is provided a novel arrangement of parts forming the water steaming and circulating elements or means, indicated as a whole by the numeral 17 in Fig. 2. Said means comprises a pair of laterally spaced fiat hollow elements or walls 18-18 which are disposed, one along the bottom portion of each side water leg and said walls extend downward-1y and inwardly therefrom so as to be spaced apart equally on each side of the median line of the firebox.

Each element is in the form of a flat tube or body of a length greater than its width and of a suitable depth, open along its bottom marginal side and closed along its top marginal side by a bulged tubular portion 19. This portion is closed at its rear end but extends forwardly beyond the body to form a flanged discharge neck20 at said end. The open bottom marginal side of the body is de- "fined by an outwardly flaring flange 21 'as iat said elements may amply resist the internal pressures to which they aresnbj'ectedin use, they are stay-bolted as "indicated at 22.

Associated with the bottom open side of each element body is a tribe 23 which is also closed at its rear end but extends forwardly beyond thebody to form a flanged intake neck 24; The flange 21 of the associated body seats snuglya ong one side of said tube and best shown in Figs. 4 and 5 and so t is welded thereto and in the rear end of the tube, in line with the open bottom of the body is an opening 25 as best shown in Figs. 1 and 4. To support said elements in proper position in the firebox, I affix to the firebox side sheets 55 shortly above the mud ring, angle bars 26-26 upon which the top bulged portions 19 of each element engages so as to be spaced from the associated side sheet; the space between said side sheets and bulged portions being filled with a suitable refractory material 27. The tubes 2323 associated with the bodies of said elements rest upon longitudinally spaced straps 2S28 which are fixed at their ends to the side parts of the mud ring and the space between said tubes are bridged by a brick arch 29, in which is an opening 30 to provide that amount of air necessary for the burning of fuel in suspension within the firebox.

The inlet tube for each element is connected with the bottom of the boiler barrel by a conduit 31 and to facilitate assembly and to reduce cost of manufacture I preferably make said conduit in more than one section. As best shown in 1, said conduit comprises a substantially straight tubular section 32 which is fixed at one end to an as sociated neck 24 and passes beneath the front portion of the mud ring, and an elbow section 33 which is fixed at one end to said section 32 and curves upwardly to be connected to the barrel of the boiler at a point well in advance of the front water leg 12.

Preferably said tubular and elbow sections are flanged as shown for attachment, the one to the other.

The front end extension 20 of each top bulged portion is connected to one of the firebox sheets and preferably with the crown sheet by an upright riser or stand-pipe 3 1. The bottom end of each riser is made with an integral flanged elbow 35 which is fixed to the associated flanged neck 20 while the top end of each riser is fixed in a flexible diais closed off by a flash wall. 38. both walls being made of firebrick. In the front or burner wall is located a fuel nozzle 39 of the oil burner type which projects through an opening 40 in said wall.

In operation, the intense heat from the fuel burning in suspension in the firebox over the elements, causes a rapid absorption of heat by the upper surfaces thereof, which heat in turn is taken up by the water in said elements, thus converting part into steam. By

reason thereof, a rapid flow of water from the forward portion of the boiler barrel into the conduits 31 takes place and from there into the tubes 23. This water passes through the opening 25 in the rear end of each tube into the body 18 of each element where it is widely distributed to receive the heat from the products of combustion to be discharged from the diagonally opposite corner thereof,

up through the associated riser 34 and then into the boiler water space above the firebox. As the risers or stand-pipes in themselves present a large superficial area to the products of combustion in the firebox, a further heating and steaming action is imparted to the water which augments that action produced in the element bodies. Thus the risers act as siphon-like pumps which assist in the lift of the water so that circulation is increased and as these stand-pipes discharge through the crown sheet near its forward end, it is assured that said end of the crown sheet is always flooded with water, even though the boiler water level falls below the normal level. Such water discharged from the stand-pipes being extremely hot will flow forwardly due to the intake from the barrel into the conduits 31 so that the circulation is accelerated and quiet areas within the boiler which makes possible the collection of sediment are eliminated.

The parts are all confined to such dimensions as to make their installation in a locomotive firebox practical and economical and they do not interfere with the numerous other parts of the locomotive. Furthermore, the parts are so disposed in the firebox that they are not subjected to such wide differences in temperatures as will cause them to be seriously affected by resulting strains and stresses.

As is apparent the construction described readily lends itself for complete removal from the firebox when it is desired to convert the same into a coal burner.

In describing the invention, I have referred in detail to the form, arrangement and coustruction of the various parts thereof, the same is intended merely by way of illustration so that I do not wish to be limited thereto except as may be specifically set forth in the appended claims.

I claim as my invention:

1. A locomotive boiler construction embodying therein a barrel and a firebox having sheets forming parts of the front, rear and side water legs of the boiler, a pair of relatively fiat hollow water heating and circulating elements disposed in the firebox and each extending downwardly and inwardly from an associated side sheet, means providing an intake for boiler water from the barrel of the boiler connected to the inner rear end portion of each element and other means providing an outlet for the outer front end portion of each element and opening through one of the sheets of the firebox and discharging into adjacent boiler water space.

2. A locomotive boiler construction e1nbodying therein, a barrel and a firebox having sheets forming parts of the front, rear and side water legs of the boiler, a pair of rela tively flat hollow water heating and circulating elements disposed in the firebox and each extending downwardly and inwardly from an associated side sheet, means providing an intake for boiler water from the barrel of the boiler connected to the inner rear end ortion of each element and other means provi ing an outlet for the outer front end portion of each element and rising therefrom and opening through the crown sheet of the firebox into the water space above the same.

3. A locomotive boiler construction embodying therein a barrel and a firebox having a crown sheet, a pair of relatively flat hollow water heating and circulating elements disposed in the firebox and each extending downwardly and inwardly therefrom, conduit means connecting the inner rear end of each element with the barrel of the boiler at a point forwardly of the front water leg there of and conduit means connected to the outer front end of each element and opening through said crown sheet.

4;. A locomotive boiler construction embodying therein a barrel and a firebox having a crown sheet, a pair of relatively flat hollow water heating and circulating elements disposed in the firebox and each extending downwardly and inwardly therefrom and each including a fiat hollow body open along its bottom rear end and a tubular portion along its outer top end, a tube secured to the open end of each body and having an opening near its rear end in communication with said body, means connecting the forward end of said tubes with said boiler barrel and risers each connected at one end to the top front end of each element and to the crown sheet of the firebox respectively.

In testimony whereof, I have hereunto set my hand, this 31st day of May, 1928.

ARTHUR WM. NELSON.

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