US2084017A - Furnace door frame - Google Patents

Description

June 15, 1937. w. P. CHANDLER, JR

FURNACE DOOR FRAME Filed Nov. 14, 1936 Willard 622375 7; J; 7 M MI M Patented June 15, 1%37 .i. i J M UNi-TE 'i FFEQE FURNACE DOOR FRAME Application November 14, 1936, Serial No. 119,869

8 Claims.

The present invention relates to water cooling devices for furnaces and, more particularly, to a water cooled furnace door frame.

By my invention I provide a water cooled furnace door frame which is a substantial improvetwo headers are connected together by a plurality of pipes extending downwardly from the upper header to the header forming the arch and which are positioned between the front and rear plates of the frame. In a construction of this character the header pipe forming the arch of the frame is bent to the proper shape and the smaller connecting pipes are welded to the two headers so as to provide communication therebetween. After this is accomplished flat plates are welded to the pipes to form the front and back walls and the space which is filled with water for cooling purposes.

In the construction shown in the Williams patent, water is introduced into the top header pipe at one end and flows horizontally across the top of the frame and then downwardly through the connecting pipes into the lower header forming the arch of the door frame. The water then passes downwardly through the side legs of the lower header to the bottom thereof and then up through the hollow leg portions of the frame to the hollow top portion and finally out through a pipe which passes through the top header.

A number of difficulties have been encountered in the manufacture of this type of frame and in its operation. In the first place, it is difficult to make sound and reliable welds connecting the flat plates to the headers and then to make equally good welds between the plates. In the second place, the water enters the inlet opening and passes through the header at the top of the door frame and is subjected to considerable heat from the water which has already been circulated through the header forming the arch. This heats up the water to a substantial extent before it is passed to the hottest part of the frame, namely, the header forming the arch. In the third place, in the structure of the Williams patent the coolest Water is in the top header and the hottest water in the space immediately below that header. There being a difference in temperature of this kind, every time the furnace is heated up and cooled down, stresses due to temperature differences are set up in the frame and in the welds and this type of construction is therefore likely to develop leaks and cracks. All of these disadvantages are real and it is the purpose of the present invention to overcome them.

In accordance with my invention I provide a hollow water cooled furnace door frame comprising a header forming the arch of the door frame, a plurality of plates forming the hollow top portion of the frame extending above the header, a plurality of said plates extending downwardly exteriorly of the header and cooperating with the header to form the hollow leg portions of the frame, and a conduit positioned within the hollow top portion of the frame and opening into the header for supplying the cooling fluid substantially directly from the inlet to the header. The header at the lower ends thereof is provided with outlet openings which communicate with the hollow leg portions of the frame and the frame is provided with inlet and outlet openings therein. In this arrangement water is fed to the door frame through the inlet and passes through the conduit which is completely enclosed in the top portion of the frame, and then passes into the header forming the arch of the door frame at the top thereof. The water then passes downwardly through the leg portions of the header into the leg portions of the frame and upwardly therethrough into the top body portion of the frame and from there is discharged through the outlet opening at the top of the frame. In accordance with my invention I prefer to utilize a conduit which is connected to the inlet opening of the frame and positioned wholly within the top body portion of the frame and extends transversely thereof and is provided with a clean-out opening at one end of the frame. This conduit is connected by one or more pipes with the header forming the arch of the frame.

A structure of this character has a number of advantages over and obviates the above-described difficulties of the type of furnace door frame disclosed in the Williams patent. In the first place, the frame which I provide eliminates the use of a pipe or header as a stiffener member at the top of the frame and the plates forming the top portion of the frame are welded directly together into a shape which is somewhat more convenient than is the case with the Williams structure where the plates must be welded together and to the header at the top thereof.

In the second place, in the structure which I provide the cold water entering the frame through the inlet is carried more directly to the header forming the arch of the door frame. By virtue of the fact that I am enabled to use conduits for conveying the water from the inlet to the header forming the arch of the door frame which are considerably smaller than the header forming the arch of the door frame, the water is carried at a higher velocity from the inlet opening to the header forming the arch of the door frame end, consequently, the water is colder when it reaches the hottest part of the frame than is the case in a structure such as that disclosed in the Williams patent. It will be appreciated, of course, that it is a considerable advantage, to have the water reach the hottest part of the frame without any appreciable prior heating, as this results in maintaining the header surrounding the door opening somewhat cooler. In the third place, the top header is completely eliminated and stresses due to temperature differences such as are set up in the frame and welds of the construction of the Williams patent are eliminated, thus eliminating any tendency for the development of leaks and cracks. A further advantage of the construction provided by my invention resides in the fact that the conduit connected to the inlet may be extended to the side of the frame and provided with a flush ing or clean-out opening.

In the accompanying drawing I have shown, for purposes of illustration only, a preferred embodiment of my invention. In the drawing,

Figure l is a front elevational view, partly in section, of the construction which I provide;

Figure 2 is a sectional view taken along the line IIII of Figure 1;

Figure 3 is a sectional view taken along the line IIIIII of Figure 1.

In the embodiment shown in the drawing the header 2 which is formed of bent pipe is U- shaped and forms the arch of the frame. The legs 3 and 4 of the header 2 extend downwardly and the header is provided with openings 5 and 6 at the lower ends of the legs, which openings are adapted to permit flow of the cooling medium from the header into the hollow legs of the frame. The hollow top portion 1 of the frame is formed by welding together a plurality of plates to form a top wall 8, a front wall 9, a rear wall Hi, and side walls H and I2. The plates welded together to form the main body of the frame are arranged to form. projecting portions 3i and I4 projecting forwardly from the front plate 9 so as to provide additional circulation space in the legs of the frame. The front plate 9 and the rear plate. It are shaped to fit the header 2 and are welded to the header 2 adjacent the center line thereof as shown in Figure 2. The welded plates, or some of them, extend downwardly exteriorly of the U-shaped header 2 to form hollow leg portions $5 and IS in cooperation with the leg portions of the header 2. A plate H is welded over each end of the header 2 and to the lower ends of the plates forming the leg portions l5 and IE to close the bottom ends of said leg portions.

An inlet opening is provided in the top plate 8 adjacent one end thereof to permit the supplying of water to the hollow frame. The opening 29 is provided with an appropriate reducer fall in order to eifect proper connection between the water supply and the conduit leading to the header 2. A conduit 22 is connected at one end thereof to the reducer 2| and extends downwardly between the front, rear and side plates of the frame and extends horizontally throughout a substantial portion of the length of the frame. As will be understood, this conduit is positioned wholly within the confines of the hollow top portion of the frame. Pipes 23 are connected with the conduit 22 and extend from said conduit to the header 2 for supplying water or other cooling fluid to the header. It will be understood, of course, that one or more such pipes may be employed in order to supply the water from the conduit 22 to the header. The conduit 22 at its end opposite the end connected to the inlet opening in the hollow top portion of the frame is connected with a clean-out opening 24 provided in the end wall of the top portion of the frame opposite the end wall adjacent which the inlet opening is positioned.

An outlet opening 25 is provided in the top plate 8 to permit the escape of water or other cooling fluid from the hollow frame after it has passed through the header 2 and through the hollow top portion.

Plates 26 and 2'! are welded to the top portion of the frame for providing flanges by means of which the frame may be secured to the furnace structure with which it is to be used. A substantially U-shaped rod 28 is also provided and welded to the top plate 8 for providing means for handling the frame. Wash-out openings 29 provided with appropriate plugs 30 are provided at the bottom end of each of the frame legs in order to permit cleaning the interior of the frame.

A small opening 3! is provided in the top of the header 2 to permit the escape of any gas, air or steam that may form within the header itself into the open space between the walls of the hollow top portion of the frame. In ordinary operation there will only be a small amount of gas, air or steam formed within the header and a small hole is all that is required to permit the escape of the gas, air or steam into the hollow top portion. The gases escaping through this hole will rise through the hollow top portion of the frame and pass out through the outlet opening with the outlet water.

In operation, the water passes into the frame through the inlet opening 20, through the conduit 22, and the pipes 23 into the header 2. The water passes downwardly through the legs 3 and 4 of the header through the openings 5 and 6 and then upwardly through the hollow leg portions of the frame and into the hollow top portion. From there the water passes outwardly through the outlet opening 25. The conduit 22 and the pipes 23 are preferably made considerably smaller than the header 2 so that the velocity of the water passing through the conduit 22 and the pipes 23 will be greater than the velocity of the water passing through the header 2. It will be understood that it is desirable to cause the water to pass with a relatively high velocity from the inlet opening to the header in order to prevent any substantial heating up of the water before it reaches the arch of the frame. A construction such as that which I provide by my invention will permit the use of a small conduit 22 whereas in constructions of the character above referred to it is necessary that the top header be of substantially the same size as the header forming the arch of the frame.

The structure which I provide has all of the advantages referred to above and obviates many difliculties which have heretofore been encountered.

While I have shown and described a preferred embodiment of my invention I do not intend to be limited to such embodiment as my invention may be otherwise embodied within the scope of the appended claims.

'I claim:

1. A hollow water cooled furnace door frame, comprising a header forming the arch of the door frame, a plurality of plates forming the hollow top portion of the frame extending above the top of the header, a plurality of said plates extending downwardly exteriorly of the header and cooperating with the header to form the hollow legs of the frame, said header at the lower ends thereof having outlet openings communicating with the hollow legs of the frame and said frame having inlet and outlet openings therein, and a conduit positioned within the hollow top portion of the frame and opening into said header for supplying a cooling fluid directly from the inlet to said header.

2. A hollow water cooled furnace door frame, comprising a header forming the arch of the door frame, a plurality of plates forming the hollow top portion of the frame extending above the header, a plurality of said pipes extending downwardly exteriorly of the header and cooperating with the header to form the hollow legs of the frame, said header at the lower ends thereof having outlet openings communicating with the hollow legs of the frame and said frame having an inlet and an outlet opening in the hollow top portion thereof, and a conduit positioned within the hollow top portion of the frame and opening into said header for supplying a cooling fluid directly from the inlet to said header.

3. A hollow water cooled furnace door frame, comprising a header forming the arch of the door frame, a plurality of plates forming the hollow top portion of the frame extending above the header, a plurality of said plates extending downwardly exteriorly of the header and cooperating with the header to form the hollow legs of the frame, said header at the lower end thereof having outlet openings communicating with the hollow legs of the frame and said frame having inlet and outlet openings therein, and a conduit positioned within the hollow top portion of the frame and opening into said header adjacent the upper part thereof, whereby the cooling fluid entering the frame inlet passes directly to the header, downwardly through the leg portions thereof, and upwardly between the plates forming the frame legs to the top portion of the frame.

4. A hollow water cooled furnace door frame, comprising a header forming the arch of the door frame, a plurality of plates forming the hollow top portion of the frame extending above the header, a plurality of said plates extending downwardly exteriorly of the header and cooperating with the header to form the hollow legs of the frame,said header at the lower ends thereof having outlet openings communicating with the hollow legs of the frame and said frame having an inlet and an outlet opening in the hollow top portion thereof, and a conduit positioned within the hollow top portion of the frame connected with said inlet and opening into said header adjacent the top thereof, whereby the cooling fluid entering the frame inlet passes directly to the header, downwardly through the leg portions thereof and upwardly between the plates forming the frame legs to the top portion of the frame and outwardly through the outlet opening.

5. A hollow water cooled furnace door frame, comprising a header forming the arch of the door rame, a plurality of plates forming the hollow top portion of the frame extending above the header, a, plurality of said plates extendingdownwardly-and cooperating with the leg portions of the header to form the hollow leg portions of the frame, said header having an opening at each end thereof communicating with the hollow leg portions of the frame, said frame having inlet and outlet openings in the hollow top portion thereof, conduit connecting with the inlet opening extending transversely of the frame within the hollow top portion, and at least one connection from said conduit to the top portion of said header for supplying cooling fluid thereto, the cooling fluid passing downwardly through the leg portions of said header and upwardly through the leg portions of the hollow frame into the hollow top portion and then outwardly through said outlet opening.

6. A hollow water cooled furnace door frame, comprising a header forming the arch of the door frame, a plurality of plates forming the hollow top portion of the frame extending above the header, a plurality of said plates extending downwardly and cooperating with the leg portions of the header to form the hollow leg portions of v the frame, said header having an opening at each end thereof communicating with a hollow leg portion of the frame, said frame having inlet and outlet openings in the hollow top portion thereof, a conduit connecting with the inlet openings, and extending transversely of the frame within the hollow top portion and communicating with a clean-out opening in a wall of the frame, and at least one connection from said conduit to the upper portion of said header for supplying cooling fluid thereto.

'7. A hollow water cooled furnace door frame, comprising a header forming the arch of the door frame, a plurality of plates forming the hollow top portion of the frame extending above the header, a plurality of said plates extending downwardly and cooperating with the leg portions of the header to form the hollow leg portions of the frame, said header having an opening at each end thereof communicating with a hollow leg portion of the frame and said frame having inlet and outlet openings in the hollow top portion thereof, and a conduit positioned wholly within the hollow top portion of the frame and connected with said inlet opening and opening into said header adjacent the upper part thereof, whereby the cooling fluid entering the frame inlet passes directly to the header, downwardly through the leg portions thereof and upwardly between the. plates forming the frame legs to the top portion of the frame, and from there outwardly through the said outlet opening, said header having an opening at the top portion thereof to permit the escape of gases from said header into the hollow top portion of the frame.

8. A hollow water cooled furnace door frame, comprising a header forming the arch of the door frame, a plurality of plates forming the hollow top portion of the frame extending above the header, a plurality of said plates extending downwardly and cooperating with the leg portions of the header to form the hollow leg portions of the frame, said header having an outlet opening at each end thereof communicating with the adjacent hollow leg portion of the frame and said frame having inlet and outlet openings in the hollow top portion thereof adjacent the top of the frame, a conduit connected with the inlet opening and extending transversely of the frame within the hollow top portion thereof and communicating with a, clean-out opening in a side wall of the frame, and at least one connection fromsaid conduit to the top of the arch formed

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