US1298813A - Furnace. - Google Patents

Description

C. W. STARKER.

FURNACE.

APPLICATION FILED AUG-3| 19H.

Patented Apr. 1,1919.

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FURNACE. APPLICATION FILED AUG.3.19H.

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FURNACE. APPLICATION FILED AUG.319H.

Patented Apr. 1,1919.

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CHARLES W. STAEKER, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WEST- INGHOUSE ELECTRIC 8; MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

FURNACE.

Specification of Letters Patent.

Patented Apr. 1, 1919.

Application filed August 3, 1917. Serial No. 184,250.

To all whom it may concern:

Be it known that I, CHARLES W. STARKER, a citizen of the German Empire, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Furnaces, of which the following is a specification.

My invention relates to furnaces'for heating metal for the purpose of welding, brazing or other similar operations, and it has particular relation to furnaces for welding or brazing together the end rings and conducting bars of the secondary members of induction motors.

One object of my invention is to provide a furnace of the above-described type in which the burners are so arranged as to concentrate an intense andevenly distributed heating flame around the portions that are to be brazed or welded and in which the intensity of the heating flame may readily be varied.

A further object of my invention is to provide means for controlling the operation of the furnace whereby only certain portions of the work are heated under certain conditions of operation.

In the accompanying drawings, Figure 1 is a view, partially in section and partially in side elevation. of a furnace embodying my invention; Fig. 2 is an enlarged plan view of the burners and the piping of the furnace shown in Fig. 1; Fig. 3 is a view, corresponding to Fig. 1, showing a modification in the arrangement of the burners, and Fig. 4: is a detail view of a portion of Fig. 1.

Referring to Figs. 1 and 2, the furnace comprises a stand or pedestal 1, upon which is mounted a circular frame 2 that is provided with radial ribs 3 for supporting a centrally located bearing 4. A vertically disposed shaft or mandrel 5 is rotatably mounted in the bearing 4 and is provided, at its lower end, with a worm wheel 6. A worm 7 engages the worm wheel 6 and is mounted on a shaft 8 that is rotatably mounted in bearing hangers 9 carried by the frame 2. The shaft 8 is provided, at one end. with a driving pulley 10 and an idler pulley 11. A second shaft 12 is rotatably mounted below and in parallel relation to, the Shaft 8 and is adapted to be driven by a suitable motor (not shown). The shaft 12 is provided with a driving pulley 14, the Width of which is substantially equal to the combined widths of the pulleys 10 and 11. A belt 15 passes over the pulleys 10 and 14: and is engaged by a belt-shifting mechanism 16 that is mounted on a rod 17.

which is longitudinally movable in a direction parallel to the shaft 8.

The upper end of the mandrel 5 is provided with a turn-table 18 upon which is mounted an upwardly projecting stud 19. As best shown in Fig. 4:, the stud 19 is provided with a collar 20 and is adapted to fit within a central opening that is provided in the core member 21 of a dynamo-electric machine, which is supported by the collar 20. The core member 21 is provided with a plurality of conducting bars 22 that extend beyond the ends thereof and project within an annular depressed portion 23 of a conducting end ring 24:. The above-described parts of a dynamo-electric machine are substantially thesame as shown and described in a copending application of Bernard Elshofl', Serial No. 66.732, filed December 14, 1915, and assigned to the Westinghouse Electric & Manufacturing Company.

A plurality of burners 25 are circumferentlally arranged around the core member 21 and are respectively mounted upon a supporting ring 26 that is carried by the frame 2. Each burner 25 comprises a casting 27 that is substantially segmental in form and is secured to the upper portion of the ring 26 by means of a stud 28 and a nut 29 coacting With a slot 30 that is provided in the ring 26. A pair of burner members 31, preferablv composed of refractory material, such as fire brick, are mounted within the cast1ng'27 and are spaced apart to provide a flame opening 32 immediately adjacent to the outer periphery of the conducting end ring 24. The specific details of the burner 25 form no part of the present invention but are fully show anddescribed in a copending patent application of 'W. W. Steven; son, Serial No. 189,338. filed Sept. 1, 1917, and assigned to the Westinghouse Electric & Manufacturing Company. The burners 25 are so arranged upon the ring 26. as to provide a space 33 between adjacent burners through which the conducting bars 22 and the end ring 24' may be observed.

As best shown in Fig. 2, the burners 25 are provided with rear projections to which are connected feed pipes 36. Each pipe 36 is connected to a gas pipe 37 that surrounds the furnace, control valves 38 being provided in each of the feed pipes 36. The gas pipe 37 is connected to a suitable source of supply and a hand-operated valve 39 is located in the pipe 37 at a point intermediate the burner 25 nearest the source and the next adjacent burner. Each of the supply pipes 36 is connected to an air pipe 40 at points intermediate the valves 38 and the projections 35. The pipe 40 is connected to a suitable means for supplying air under pressure, and a control valve 41 is located in the pipe 40 at a point intermediate the burner nearest the air supply and the next adjacent burner.

In the modification shown in Figs. 3 and 4, each burner 25 is adjustably mounted upon a standard 42 that comprisesa base 43 and an upwardly extending rod 44. The rod 44 is provided with clamping members 45' that embrace pipes 46 and 47 which are connected to the burner 25 and are respectively adapted to supply air and gas thereto. .The clamping members are held together by a bolt'48, A second set of burners 25 are circumferentially arranged below the end ring 24, each burner 25 being so mounted upon the pipes 46 and 47 as to deliver its heating flame in a substantially vertical direction at points adjacent the depressed ortion 23 of the ring 24. The air and gas supply- pipes 46 and 47, respectively, are preferably connected as shown in Figs. 1 and 2.

Having described the various parts of my furnace, the operation thereof is as fol lows:

A quantity of fusible conducting material, preferably in the form of brass spelter or other alloy having a good electrical conductivity, is plzred in the spaces of the depressed portion 23 that are not occupied by the bars 22 or around the portions of the end ring adjacent to the bars 22. The turn-table 18, together with the core member 21, is then caused to be rotated by shifting the belt 15 over the driving pulley 1O. Gas and air are then supplied to all of the burners 25, and, after the mixture has been ignited, the intensity of the flames is regulated by the valves 38. The continued rotation of the core member enables the operator to observe the condition of the work, and, when all the sp'elter has melted properly, the furnace is shut down and the core member withdrawn. If, however, any portions of the end ring 24 are heated unequally, orthe spelter does not melt uniformly, the operator then closes the valves 39 and 41 to cut off the gas and airsupply from all but one of the burners 25. The belt 15 is then shifted to the idler pulley 11, and,v after the turn-table ing zone of the remaining burner 25 by turning a hand wheel 49 that is provided on the shaft 8. In this manner, all of the spelter may be brought to a uniform state without operating the entire furnace and possibly overheating portions of the end rings and bars that are already properly brazed together.

The operation of a furnace provided with burners arranged as shown in Figs. 3 and 4 is substantially the same as described above, with the additional advantage that the individual burners may be raised or lowered in accordance with the proportions of the core member upon which it is desired to work. Furthermore, the provision of vertical heat.- ing flames below the end ring is very desirable when it is desired to brace the secondary members of machines of large ca-' P ity- While I have shown my invention in several preferred forms, it is not so limited but is susceptible of various other modifications within the scope of the appended claims.

I claim as'my' invention? V 1. The method of operating a welding furnace comprising a. rotatable work-carrying mandrel and a plurality of burners surrounding said mandrel which consists in continuously rotating said mandrel while supplying a combustible gaseous mixture to all of saidburners and then rotating said mandrel in steps while supplying only a certain number of said burners.

2. The method of operating a welding furnace comprising a rotatable work-carrying mandrel adapted to berotated by a driving motor, a plurality of burners surrounding said mandrel and means for supplying a combustible gaseous mixture to each of said burners independently of the others, which consists in continuously rotating said mandrel by said driving motor while supplying all of said burners and then manually rotating said mandrel in steps'while supplying only a certain number of said burners.

3. In a furnace, the combination with a rotatable mandrel, of a plurality of sets of burners surrounding said mandrel and adapted to deliver flames radially inward, and substantially parallel with respect to the longitudinal axis of said mandrel, respectively.

4. In a furnace, the combination with a rotatable mandrel and a work table carried thereby, of a set ofburners adapted to deliver flames in a radial direction toward said table, and a second set of burners located below said table and adapted to deliver flames upwardly toward said table.

5. In a furnace, the combination with a rotatable mandrel and a work table carried thereby, of a plurality of circumferentially arranged burners that are vertically adjustable with respect to said table.

6. In a furnace,'the combination with a rotatable mandrel and a. work table carried thereby, of a set of circumferentially arranged burners surrounding said table and located adjacent thereto, and a second set of burners circumferentially arranged below said table, both of said sets being vertically adjustable with respect to said table.

7. In a furnace, the combination with a rotatable mandrel, of a plurality of independent segmental burners circumferentially arranged about the mandrel, means for adjustably and independently supplying a fuel mixture to the burners and means operable to simultaneously shut 01f fuel to all save one of the burners.

8. In a furnace, the combination with a rotatable work table, of a plurality of burners arranged circumferentially about the table to direct their flames radially toward it, a plurality of burners located below the table and circumferentially thereof to direct their flames upwardly toward the periphery of the table and independent means for vertically adjusting all of the several burners.

In testimony whereof, I have hereunto subscribed my name this 17th day of July CHARLES W. STARKER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latenta,

Washington, D. 0.

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