US1864600A - Method of forming wall plate structures for furnaces - Google Patents

Description

June 28,. 1932. HQC. LORD 1,864,600

METHOD OF FORMING WALL PLATE STRUCTURES FOR FURNACES Filed June 20} 1930 2 Sheets-Sheet l I /4 1; @000 4 08000 8 s O '4 Q G 0000 9 Q Q OQOO 6 INVENTOR.

H. C. LORD June 28, 1932.

METHOD OF FORMING WALL PLATE STRUCTURES FoR FURNAcEs Filed June 20, 1930 2 Sheets-Sheet 2 Patented June 28, 1932 UNITED STATES PATENT OFFICE HUGH C. LORD, OF ERIE, PENNSYLVANIA, ASSIGNOR TO ERIE CITY IRON WORKS, OF

' ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA METHOD OF FORMING WALL PLATE STRUCTURES FOR FURNACES Application filed June 20,

The present invention is designed to simplify the forming of furnace plates and the structure arising therefrom. It is particularly directed to a form of furnace in which some of the walls of the furnace form walls of a superimposed boiler, the side plates of the furnace forming the inside plates of water legs. In fabricating the boiler furnaces for this combined furnace and boiler it is common to form the crown sheet of the furnace with the side walls of the furnace. In order that diflerent lengths of furnace may be formed it is desirable that the side plates be kept below the crown sheet so that in bending the crown sheet regardless of the length of the furnace to be formed the side plates Will not interfere with the easy bending, or forming of the crown sheet. It is also desirable to provide such a furnace with a return flue projection which extends upwardly from the rear of the furnace chamber, the front of this projection being provided with a flue sheet from which the flues pass through the boiler. The simplicity in the forming of these sheets and a reduction in the length of joints, usually welded joints, is particularly desirable. The present construction accomplishes this purpose in a very simple and con- Venient manner. Features and details of the invention will appear from the specification and claims.

A preferred embodiment of the structure and manner of practicing the method is illustrated in the accompanying drawings as follows Fig. 1 shows a central vertical section through the furnace and boiler.

Fig. 2 a section on the line 2-2 in Fig. 1.

Fig. 3 a section on the line 3-3 in Fig. 1.

Fig. 4 a detached View of the crown sheet with its depending sides.

Fig. 5 a detached view of the upper rear flue sheet.

Fig. 6 a perspective View of the rear plate of the furnace chamber.

Fig. 7 a detached View of the outer plate forming the rear water leg.

Fig. 8 a perspective view of the bottom rear flue sheet.

Fig. 9 a perspective view of the crown 1930. Serial No. 462,614.

sheet, the rear flue sheets and the rear water leg sheet detached from the rest of the furnace.

1 marks the furnace chamber, 2 the crown sheet over the furnace chamber, 3 the depending side walls on the crown sheet, 4 an outer shell having an upper cylindrical portion 5 forming the upper wall of the boiler, the deper flue sheet 15 and discharge to a rear smoke box 16 and from this to a stack connection 17 The rear flue sheet 10 forms the front wall of a return flue projection 11 extending upwardly from the body of the furnace. The crown sheet 2 is substantially horizontal having rounded corners 20 leading to the side wall portion 3. The side walls extend somewhat to the rear of the crown sheet 2. The flue sheet 10 has its lower edge 19 conforming to the contour of the crown sheet 2 including the rounded portion 20. Side walls 21 for the return flue projection 11 are formed by rearwardly bent portions at the ends of the flue sheet. The lower edges 22 of the side walls 21 abut the upper edges 23 of the part of the side wall 3 extending to the rear of the crown sheet. The edge 19 is preferably welded to the rear end ofthe crown sheet and the edge 22 welded to the edge 23 of the side walls.

A rear wall 24 closes the furnace. It has a vertical portion 25 which extends to the bottom of the furnace and an upper portion 26 which is curved forwardly, the forward edge 27 of the upper portion meeting with and joining the upper edge 29 of the flue sheet 10. The side edges of the plate 24 are joined with the edges 21a: of the side plates 21 and the edges of theportion 25 are joined with the vertical :part ofthe side plate 21 and the rear end of the side walls 3. These joints are closed and completed by welding.

The upper rear crown sheet has its up per cylindrical edge connected with the upper portion 5 of the plate 4 and its sides connected with the side walls 6 of the plate 4. The lower edge 31 of this upper rear flue sheet is connected with the upper edge 32 of the rear water leg plate .33, this plate having a flange 34 at its lower end closing the bottom of the water leg, the side edges of this rear waterleg plate. being connected to the outer shell and being within a plate 17a forming the outer wall of the smoke box 16.

It will be noted that there is no obstruction on the rear end of the side wallS-to interfere with the easy bending of the portions, whether this is done'in-a press, or by a bending machine. Connecting the flue sheet with the side walls 21 eliminates a weld at the corner between the flue'sheet and the side walls. The total welding lines are Very materially reduced. The openings in the rear flue sheet are arranged in'a comparatively small plate and in a plate that may be pre-formed before theseopenings are made and at any rate is small enough to be readily fashioned. The rear closure plate is of simple construction and again forms convenient joints with the adjacent parts.

-Vhat I claim as new is 1 1. The method of making furnace walls of metal plate, which consists in forming on a main plate a top and depending sides; forming a flue sheet by shaping the same with its lower edge conforming to the rear end of the top of the main sheet, and-bending the ends of the'flue sheet rearwardly to pro- Vide sides for a return projection of the furnace chamber, bringing the lower edges of the bent ends into joining relation with the sides of the main sheet; forming ,a rear plate by shaping a rear plate to conform to the rear edges of the furnace sides, bending said rear plate forwardlyto conform to the upper edges of'the rearwardly bent portions of the flue sheet and shaping the forward edge of said forwardly bent portion to conform to the upper edge of the flue sheet; assembling the sheets by joining the bottom edge of the flue sheet and the lower edges of the rearwardly bent ends with the rear end and sides of the main sheet, and the rear plate with the rear ends of the sides of the main sheet. the top edges of the rearwardly bent ends of the flue sheet and the top edge of the flue sheet; and welding the plates along the joined edges. 7

2. The method of making furnace walls of metal plate, which consists in forming on a main plate a top and depending sides with a curved connection between the top and depending sides; forming a flue sheet by shaping the same with its lower edge conforming to the rear end of the top of the main sheet, and bending the ends of the flue sheet the forward edge of said forwardly bent porq tion to conform to the upper edge of the flue sheet;-assembling the sheets by joining the bottom edge of the flue sheet and the lower edges of the rearwardly bent ends with the rear end and sides of the main sheet, and the rear plate with the rear ends of the sides of the main sheet, the top edges of the rearwardly bent ends of the flue sheet and the top edge of the flue sheet; and welding the plates along the joined edges.

3. The method of making furnace walls of metal plate, which consists in forming on a main plate a top and depending sides with the side plates formed with plane surfaces and extending to the rear ofthe top of the main plate; forming a flue sheet by shaping the same with its lower edge conforming to the rear end of the top of the main sheet, and bending the ends of the flue sheet rearward- 1y to provide sides for a return projection of the furnace chamber, bringing the lower edges of the bent ends into joining relation with the extending ends of the sides of the main sheet; forming a rear plate by shaping a rear plate to conform to the rear edges of the furnace sides, bending said rear plate forwardly to conform to the upper edges of the rearwardly bent portions of the flue sheet, and shaping the forward edge of said forwardly bent portion to conform to the upper edge of the flue sheet; assembling the sheets by joining the bottom edge of the flue sheet and the lower edges ofthe rearwardly bent ends with the rear end and sides of the main sheet, and the rear plate with the rear ends of the sides of the main sheet, the top edges of the rearwardly bent ends of the flue sheet and the top edge of the flue sheet; and welding the plates along the joined edges.

In testimony whereof I have hereunto set my hand.

HUGH C. LORD.

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