Патент USA US2134871код для вставки
Nov; '1, 1938. ' w, B GRAHAM 2,134,871 OIL_ BURNING FIRE- BOX Filed Feb. 24, 1936 Wade B. Graham BY 46, m ATTORNEY? Patented Nov. 1, 1938 2,134,371 UNITED STATES PATENT OFFICE 2,134,871 OIL-BURNING FIRE BOX Wade B. Graham, Houston, Tex. Application February 24, 1936, Serial No. 65,241 2 Claims. (Cl. 158‘--3) This invention relates to oil burning locomo the letter B the lower portion of the ?re box of tives and to mechanism embodying steam gener the locomotive commonly called a ?re pan. The ating units of similar construction, and is par ?re pan B comprises a sheet metal shell consisting ticularly concerned with an improved ?re box of a rectangular structure It and of a plate I I 5 construction. supported in the bottom of the structure 10 by In the construction of oil burning locomotives, means of ?anges l2. The plate II, which con~ it is conventional to equip the ~?re boxes with stitutes the draft bottom of the ?re box, is con— draft bottoms formed with a single opening lo structed with a large opening l3 adjacent the cated adjacent the wall opposite the fuel nozzle. rear Wall of the ?re box and with a plurality of This opening is made of a size to permit the en smaller openings Ill arranged between the large 10 trance of a su?icient amount of air to effect e?i opening i3 and the forward end of the box. The cient combustion when the throttle is open and large opening [3 is surrounded by an upwardly a forced draft maintained by the steam exhausted extending metal structure I5 consisting of a plu from the engine cylinders, and is so positioned rality of suitably shaped angle irons, and mounted 15 that it effects the proper distribution of the air in each of the apertures M there is an upstanding under such conditions. Such opening does not, tube 16. The fire box is lined with ?rebricks ll, however, permit the entrance of a sufficient except for that portion of the bottom which is amount of air to effect e?icient combustion, or occupied by the tubes [6. This portion of the act to properly distribute the air when the throt bottom is lined with a layer of ?re-proof cement 20 tle is closed or but slightly open and a much [3 which ?lls the spaces between the tubes [6. smaller draft maintained by a steam blower. The At the forward end of the ?re box, there is a ine?icient combustion resulting under the latter ?ooring C which closes the opening between the conditions causes the formation of carbon on the ?re box and the adjacent wall of the boiler. This draft bottom, the emission of gas into the engine ?ooring comprises a sheet metal plate [9 sup cab, the production of internal explosions re ported in place by angle members 20 and covered 25 sulting in ?ashes of ?re being expelled into the with ?rebrick ll. cab through the ?re door, and the loosening of the The forward wall of the sheet metal structure brick in the ?re box. II] is formed with an aperture 2! and the bricks It is an object of this invention to provide a 30 ?re box construction which will result in the elimination of the above named objectionable fea tures in locomotives, and which may be employed in mechanisms embodying similar steam gener ating units to effect a like result. 35 The invention will be best understood from the description of one practical embodiment thereof, illustrated in the accompanying drawing, in which: Fig. 1 is a perspective view of a draft bottom for 40 a ?re box of the type contemplated by this inven tion. Fig. 2 is an enlarged fragmentary section of the member illustrated in Fig. 1 taken through one of the upwardly extending tubes; and Fig. 3 is a longitudinal sectional view of the lower portion of a ?re box embodying the present invention, the rear lower portion of the boiler being illustrated in dot and dash lines. The ?re box illustrated in the drawing is de signed for use in a conventional locomotive of the type in which the ?re box is located at the rear of the boiler and communicates with the smoke stack through the ?ues of the boiler. Referring to Fig. 3, the letter A indicates the 55 rear bottom portion of the boiler of a locomotive; 45 at that end of the ?re box separated so as to provide an opening into the interior of the ?re box for a fuel injection nozzle 22. The nozzle 22 is of a steam actuated injection type, and is fed with oil from a pipe line 23 and with steam from a pipe line 24. The flow of steam and oil through the pipe lines 23 and 24 is controlled in the usual manner by means of manually operated valves located in the engine cab. During the operation of the engine, fuel is injected into the ?re box B in the direction of the rear wall which, in the parlance of the art, is ‘called, a flash wall in that it is maintained at a white heat capable of igniting the fuel. The in jected fuel burns within the ?re box, air being supplied by way of the opening l3 and the tubes it. The gases of combustion pass upwardly and forwardly into the boiler flues and from there into the forward compartment of the engine where they are expelled through the smoke-stack. During the periods when the engine throttle is open, a forced draft is maintained through the 1 ?re box as a result of the steam exhausted from the engine cylinders being expelled through the smoke-stack. This forced draft is eliminated when the throttle is closed, and is ineffective with a slight opening of the throttle. At such times, a 55 2 2,134,871 steam blower mechanism arranged to create an auxiliary forced draft is opened. The steam pass ing through the blower mechanism produces a much smaller depression at the forward end of What is claimed is: 1. A ?re box for locomotives comprising a ?re pan, said pan including front, rear and bottom Walls, ?re brick on said front and rear walls, the boiler flues than the exhaust steam when the said bottom wall having a draft opening sub throttle is open, and in locomotives in which the ?re boxes are equipped with conventional draft bottoms having a single opening, ine?icient com bustion results from insufficient air being drawn stantially across the end adjacent said rear wall, and also having a plurality of additional air in lets, each of said inlets being of less area than said opening and said inlets being distributed into the ?re box and from improper distribution of the indrawn airv This insu?icient combustion results notwithstanding that the fuel supply is reduced, as is done when the throttle is main burner in said forward Wall to direct a spray of fuel along the ?re box across said inlets and against said rear wall, said inlets serving to ad tained closed or in a nearly closed position for 15 substantial periods of time, and causes the ob jectional features previously set forth, including the production of dangerous explosions. With a draft bottom of the type herein described, ef?cient combustion is maintained during periods in which 20 the throttle is closed, both with a normal fuel supply and with a reduced fuel supply, notwith standing that there is a lessened tendency to draw air into the ?re box. This maintenance of e?icient combustion results from the draft bottom 25 being formed with a large number of openings arranged to provide more equal distribution of the air entering the ?re box, and from the mixing of the air with the fuel produced by the jets of air entering through the tubes l6. over said bottom wall, and a liquid fuel spray ' mix air with and assist in vaporizing the fuel before it reaches said rear wall. 15 2. A fire box of the character described com prising a box portion having front and rear walls and a substantially horizontal base, ?re brick linings on said walls, said base having an elon gated draft opening at one end thereof, a plu 20 rality of small upstanding air inlet tubes extend ing through and distributed over the base of said box to provide for distribution of air admitted to said box, said base including a body of refractory cement surrounding said tubes, and means to in 25 ject liquid fuel into said box across said air inlets and over said elongated draft opening. WADE B. GRAHAM.