US1452295A - Fire arch for furnaces - Google Patents

Description

E. E. FROZETH ET AL.

FIRE ARCH FOR FURNACES Filed May 24 1921 2 Sheets-Sheet 1 gwuento'm TERRY BLIXT ERNST EMIL FRuzETH Apr. 17, 1923. 1,452,295

. E. E. FROZETH ET AL FIRE ARCH FOR FURNACES Filed May 24 1921 2 Sheets-Sheet 2 8 :E lg 3 I Z8 Z8 IQ- ig- TERRY BLIXT ERNST EMIL FROZETH Patented Apr. 17, 1123..

are er mnsr MIL FRO ZETH AND TERRY BLIXT, 0]! MINNEAPOLIS, MINNESOTA.

FIRE ARCH FOR FURNACES.

Application filed May 24, 1921. Serial No. 472,261.

To all whom it may concern:

Be it known that we, ERNST E. Fnozn'rn and TERRY BLIXT, citizens of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Fire Arches for Furnaces, of which the following is a specification.

This invention relates to fire arches for furnaces and boilers and the main object is to provide a highly efficient and practical construction of fire arch and means for suspending the same in a furnace where a particularly strong arch is deslred or where a high degree of heat is developed. Further objects will be disclosed in the course of the following specification and are 1 llustrated in the accompanying drawings, in which:

Fig. 1 is a top plan view of the arch 1n place in a furnace, the top of the furnace and many parts of the arch suspending ele-- ments being removed.

Fig. 2 is a transverse sectional view of the furnace arch, as seen substantially on the line 2-2 in Fig. 1.

Fig. 3 is a section of the arch as seen substantially on the line 3-3 in Fig. 1.

Fig. 4 is a detail side view of one of the wedge shaped blocks.

Fig. 5 is an end view of one of the wedge shaped blocks.

Fig. 6 is anenlarged detail section on the line 66 in Fig. 3. I

Fig. 7 is a detail view illustrating a modification of one of the fire blocks.

Referring to the drawings by reference characters, 10 designates the front wall of a furnace having side walls 11 and a curtain wall 12, all suitably constructed of common fire brick. The arch as hereinafter described, is almost entirely sustained between the walls 10 and 11 by being suspended from two transverse girders 13, 14 which are preferably made of channel iron and have their ends imbedded in the side walls 11. Supported 'on the lower flanges of the channel girders 13 and 14 is a series of suspension beams, each consisting of two angle irons 15 held together but in slightly spaced relation by suitable clips 16. Hangers 17 are suspended between the angle irons 15 of each pair b pins 18, their lower ends being secured y pins 19 in slots 20 of tapered heads 21 of the main arch blocks 22.

An angle iron 23 runs parallel to the channel girder 14 and is bolted thereto by bolts 24, being first spaced therefrom by spacers 25. -Intermediate this channel iron and angle iron are positioned hangers 26 which are similar to the hangers 17, but which support a series of. corner hanger blocks 27 (see Figs. 3 and 6). These blocks 27 are angularly tongued and grooved against each other as at 28 so as to prevent the passage of flames directly up between them to the iron beams. These blocks are also formed with a wide shoulder 29 (see Fig. 3) adapted to support a part of the weight of the curtain wall 12, the balance of such weight being carried by the horizontal flange of the angle iron 23.

The blocks 22, 27 are enlarged at their lower ends so as to present the continuous fire surface of the arch, but their main body portions are upwardly tapered so as to receive between them a numberof what may be termed wedge blocks 8 and 30. .The blocks 8 are longer at their lower ends than at their upper ends (see Fig. 4) so as to conform with the recesses between the blocks 22, but, as'the blocks 30 follow each other in'a row their ends may be square cut, thereby making the arch a solid and firm construction. It will be readily understood that the blocks 8 and 30 being wedge shaped will have a tendency to tighten the arch, and this condition will also have the effect of distributing their pressure equally on all parts of the suspension blocks with which they come in contact and not on a few particular places as has been quite universally customary heretofore. To allow for the expansion and contraction of the arch from heat We find it desirable to provide a composition packing to be inserted between the blocks 8, 30 and 22, 27. Such a composition" is preferably made of asbestos. gannister and clay, or some similar material.

It will be noted that the blocks 8 and 30 are considerably shorter than the suspension blocks, and also, that the suspension blocks are provided with shoulders on which rest the capping blocks or plates 9, the object being to create an air space such as 31. To provide for a slight ventilation under the plates 9 so as to prevent the accumulation of dead air, a few of the blocks 9 may have ventilating holes 32 (see Fig.

1),-or, may preferably have a corner broken off (see Fig. 7 as such is more easily provided.

From the foregoing it is believed that our invention will be understood and its advantages and merits realized by all those familiar with the present state of the art. We, however, do not desire to limit ourselves to the particular forms, arrangements and constructions as illustrated and described, and in the construction and installation of the device may see fit to embody a number of modifications, provided, however that such modifications come within the spirit and scope of the appended claims.

Having now therefore fully shown and described our invention, what we claim to be new and desire to protect by Letters Patent is: 7

1. A fire arch of the classdescribed consisting of a number of suspension blocks, the same being widest at their lower ends and arranged so as toform with their lower ends the entire underside of the arch, means for hanging the suspension blocks in a boiler or furnace, and a number of downwardly tapered wedge blocks adapted to be inserted and substantially fill the space in between the suspension blocks above said lower ends.

2. A fire arch of the class described consisting of a number of suspension blocks each tapering upwardv on all sides from its lower end, downwardly tapering wedge blocks adapted to substantially fill in the spaces between the body portions of the suspension blocks, and means for hanging the suspension blocks in a furnace so as to permit their lower ends to compose the en tire underside of the arch.

3. A fire arch of the class described consisting of a number of upwardly tapered suspension blocks hung in checked arrange ment so-that their lower ends will compose the underside of the arch, downwardly tapered wedge blocks arranged to fill the spaces between said suspenslon blocks, some of said wedge blocks having inclined end faces so as to closely fit against the sides of adjacent wedge blocks. 7

In testimony whereof we affix our signatures.

ERNST EMIL FROZETH. TERRY BLIXT.

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