US1416438A - Furnace - Google Patents

Description

n. s. BAIIIIOWS.

FURNACE.

APPLICATION FILED IuLY 29, 1919.

Patented May 16, 1922.

DONALD S'. BARROWS, 0F ROCHESTER, NEW YORK.

FURNACE.

To all whom t may concern.'

Beit known that I, DONALD S. Barrows, a citizen of the United States7 residing at Rochester', in the county of Monroe and State of New York, have invented certain new and useful Improvement-s in Furnaces; and I do hereby declare the following to be a. full, clear, andy exactdescription of the invention, such as will enable others skilled inthe art to which it appertains to make and use the same.

The invention relates to furnaces, and more particularly to improvement in roof members for furnaces used in the re-melting of pig iron with steel, cast iron or malle able iron scrap for the production of grey iron or malleable iron castings.

The principal object of my invention, broadly stated, is to provide metallic removable roof` members or bungs as they are commonly called, with. means for reinforcing the lower portion thereof'7 said means also serving to protect` the saidtportions from distortion due to the intense heat within the furnaces and from the' destructive action of the furnace gases.

Another object: of: the invention is to provide a bungy with self-adjusting clamping means for holding the roof bricks in assembled position, said clamping means being so arranged as to maintain a substantially uniform pressure over the entire area of the roof; bricks or refractory lining of the furnace bung.

There are other objects ofv the invention which will be hereinafter more fully described in connection with the single embodiment of my invention which I have chosen for the purpose of illustration. In the drawings:

Figure l is a side elevation of a portion of a furnacebung showing the invention applied thereto7 Figure 2 is .a perspective view of one of the detachable lower flange members, and

Figure 3 is a section on line 3 3 of Figure l, the direction in which the'y view is taken being indicated by the arrow.

Throughout the specification andy drawings like parts are designated by like reference characters.

Before describing the invention in detail it might. be pointed out that the lining of melting furnaces and such portions of the structural frame work as are subjected to relatively high temperatures are subject to Specification of Letters Patent. Paltutgd Mig@ 3169 1922.

Application led July 29, 1919.

Serial No. 313,986.

rapid deterioration in use, and yit has been found that the straightening or renewing of the metallic roof members when formed by rolled steel -beams bent to form an arch is one of the principal items of expense in the maintenance of such furnaces. Each of these I-beam bungs is provided on its lower flange with a. lining of refractory material, generally in the lform of lire bricks, these in turn forming a section of the furnace roof. These bricks are maintained in place and in contact with the lower flange of the I-beam bung by various mechanicall means7 the most usual being some form of clamp by which pressure can be exerted upon the series of brick to keep them in close contact with one another and withthe bottom flange ofthe I-beam. When a. furnace roof is built up in sections in this manner it is possible to repair breaks in the roof quickly by removing a defective bung and substituting a new bung in place thereof. it should be understood that the bung frames are usually assembled with their refractory linings clamped. in position and then placed in position by suitable, machinery on the furnace side walls7 either separately or in groups of two or more. v v

This type ofl furnace bung has theadvantage of being lighter than those in which the bung frame is a'- casting7 but it has certain defects` among which may be named the following:

(l) Expansion of the lower Bange of the I-beam bung frame caused by the extreme heat toi which it is subjectedaand the small amount of radiatingarea which said flange presents.

(2) Rapid burning or melting away of portions of this lower flange when through a. defect in the refractory lining or otherwise flames from the interior of the furnace play directly upon such flange.

(3) Either of the defects mentioned above create a tendency of the bungl frame to straighten out and not retain its original arched form, this tendency also operating to relieve the previously applied clamping pressure on therefractory lining and causing portions of the latter to be released and fall from the bung into the furnace.

(4) Failure of the usual type of clamping means to maintain uniform pressure on the refractory lining, such clamping means usually not providing for the unavoidable variation in total length of the lining when composed of separate fire brick. lf the total length of such lining measured along the length of the bung frame should exceed the length for which the clamping` means is designed to operate satisfactorily7 the clamping pressure is usually localised on a plane near the top of said lining and this incorrect application of clamping pressure frequently defeat-s the object for which the clamping means is designed by forcing the lining from Contact with the bung frame instead of holding said lining in close contact with the frame.

By my invention the defects described above are eliminated and a furnace bung is provided which is relatively light and easy to handle and comparatively cheap of construction and maintenance.

Referring now to the drawings 1 designates a furnace bung` of the usual construction comprising an -beam having a top flange 2, a web 3 and a lower flange l. At the center of the upper flange 2 is provided a link or clevis A the object and purpose of which is to provide means connecting the bung to the hoisting apparatus to permit the assembly and removal of the furnace bung from the furnace.

The numeral 5 indicates a plurality of hanged protecting members each of which preferably comprises a web 6 and a flange 7, the latter being provided with an undercut groove 8. The flange and web are preferably connected at a plurality of spaced points by means of the laterally projecting ribs 9. At their ends the flanged member 5 are each preferably provided with perforated flanges 10. The perforations 11 serving, if desired, to receive bolts 12 or other equivalent fastening means for connecting the adjacent ends of the flanged members when in position. The bolts 12 are preferably provided with slots 13 to receive taper keys 14 to maintain the bolts in assembled position. intermediate some of the ribs 9 the web 6 of the members 5, may be and preferably are provided with bolt receiving openings 15, adapted when the members 5 are assembled on the bung to register with like openings 1G provided in the web 3 of the said bung, the said openings are adapted to receive the fastening bolts 17 which connect the members 5 to the bung 1. 'lhe flanged members 5 are adapted to be applied to the opposite sides of the lower portion of the bung in alined pairs, the grooves 8 in the members 5 being adapted to receive the adjacent portions of the bung flange Ll.

lt will be readily apparent from the drawings that the members 5 form a housing` surrounding the lower flange f1 of the bung and serve to protect the latter from injury. Not only do the flange members give protection to the lower flange of the bung, but in addition they greatly increase the effective width of the bung fiange and hence permit the use of bricks of increased length in connection with each bung. rllhis increase in length of the bricks in a furnace roof decreases the number of bungs required Vto complete the roof and materially decreases the cost of construction.

llo maintain effectively the large size bricks diagrammatically illustrated at 18, in position on the bung preferably provide each bung with suitable clamping members. .For convenience of illustration l have shown but a portion of a bung but it is to be understood that the clamping member illustrated may be duplicated at the opposite end of the bung if desired although it is possible to employ but a single clamping member for each bung. p

Adjacent the end of the upper fiange 2 of each bung` l provide a shoe 19 which may be furnished with a curved or concave face 20. The said shoe is rigidly connected to the said flange in any suitable manner. A lever 21 is provided7 the said lever being pivotally connected to a projection 22 extending from the web 3 of the bung, by means of a bolt or pivot pin 23. The said lever is provided adjacent one end with an adjustable set screw 24 the inner end of which is adapted to bear on the curve face of the shoe 19. The opposite end of the level1 2O is provided with a concave face 25 adapted to engage a correspondingly curved faced block 26 which in turn bears against the flat face of one of the lining bricks 18. Owing to the curved faced contact between the lever and the block 26 the line of pressure through the bricks will always be maintained substantially adjacent the center thereof, thus maintaining a constant and even pressure through all of the lining bricks without any distortion or tendency to separate the bricks at either top or bottom.

Having now described my invention in detail, although it is to be understood that the foregoing description is to be taken in the descriptive and not the limiting sense, since what 1 claim and desire to secure by Letters Patent is 1. A. furnace bung comprising a metallic member and a lining of refractory material, and means interposed between said lining and the said member for protecting the latter.

2. A furnace bung comprising a flanged member and a lining of refractory material, and means interposed betweeny said lining and the flanged member for protecting the latter.

3. A furnace bung comprising a flanged member andk a lining of refractory material and flanged means interposed between the lining and the said member for protecting the latter.

Il. A furnace bung comprising a flanged member and a lining of refractory material and a plurality of flanged members interposed between the lining and the flanged member for protecting-tbe latter'.

5. A `furnace bung comprising a flanged member and a lining of refractory material and a plurality of members interposed between the anged member and the lining for protecting the said member and means for connecting` the said members to tlie said flanged member.

6. A furnace bung comprising a' flanged member and a lining of refractory material and a plurality of members interposed between the flanged member and lining, said members being adapted to embrace one of the yflanges of said flanged member to protect the latter.

7. A furnace bung comprising a flanged member and a lining of refractory material and a plurality of members interposed between tbe flanged member andlining, said members each being provided lWith a slot adapted to receive one of the flanges of tlie said flanged member, said members serving to protect the flanged member.

8. A. furnace bung comprising a member and a lining of refractory material, means for maintaining said lining in position said means comprising a lever provided with a concave face and block interposed between said lever and said lining said block having aconvex face adapted to contact the said face on the lever.

9. A furnace bung comprising a metallic member and a lining of refractory material, means for maintaining said lining in position said means comprising a lever pivoted to the said bung, a block interposed between the lining and one end of said lever, said lever and block being provided with symmetrically curved contacting faces and means for applying pressure to the opposite end of the said lever.

In testimony whereof I ailix my signature.

DONALD S. BARROVVS.

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