US2391876A - Material treating tank - Google Patents

Description

Jan. 1, 1946. c. 5. BROWN MATERIAL TREATING TANK Filed June 5, 1942 2 Sheets-Sheet l 5 a 7 x 6 m M 2:50 22 m 0 N E 0 2 7 1 B 5 m e m 3 3 m 5. fl y F m A C Jan. 1, 1946. c. 5. BROWN MATERIAL TREATING TANK 2 Sheets-Sheet 2 Filed June 5, 1942 INVENTOR.

C/IEL 5. B/eow/v Patented Jan. 1, 1946 MATERIAL TREATDIG TANK Carl S. Brown, Lakewood, Ohio, assignor to Glascote Products, Inc., Euclid, Ohio, a corporation of Ohio Applicati'on June 5, 1942, Serial No. 445,845

3 Claims.

This invention relates to. a jacketed tank or kettle. More particularly this invention is. concerned with animproved jacketed container or tank of a. type using a heat transfer medium, such as a hot or cold fluid, which is. circulated in the region between the tank and the jacket to effect a heating or chilling of the contents. of the tank. These, therefore, are the general objects of the present invention.

Jacketed tanks or kettles are in extensive use at the present time. to heat or cool plastic mixtures or fluids, for instance, in dairy processing and chemical plants. In many instances. the materials to be treated are such that it is preferable to use metal tanks, the size of which may vary from two or three gallons to two or three thousand gallons. Many materials to be treated are of such a nature that it is desirable to coat the interior of the tank, either for sanitary purposes or to prevent corrosion or other chemical reaction of the tank itself. It has been found that. a very efiicient form of coating comprises a comparatively thin layer of fusible material, such as glass, which may be fused to the internal surfaces of the tank. In such tanks the jackets are applied to the tank after the fusion of the coating has been completed.

To facilitate the circulation of the fluid heat exchange medium in the jacket, it has been found advantageous to utilize a series of partitions or bafiies which extend transversely from the inner wall of the jacket wall to the exterior wall of the tank. These baflles are so arranged that when the heat exchange medium is forced through the jacket it will be circulated through a passageway e or passageways formed by the baffles and thus insuring circulation throughout the entire area of the jacket and contact with the entire surface of the tank.

When the tanks are coated internally with a fusible material, it has been found difficult to position the baffles between the jacket and the tank so as to insure the desired circulation. This is partially due to warping of the tank when it is heated to fuse the coating thereto. Likewise, after the coating has been. fused to the tank it is no longer practical to attach the baflies to the wall thereof, because of the. danger of cracking or otherwise spoiling the coating.

Because of these difiiculties, baffles have been generally omitted from the jackets of coated tanks. In the few instances where they have been used they have been secured to the internal wall of the jacket and the tank then loweredinto position in the jacket. To permit such.- positioning of the tank within the jacket, these baiile's are so constructed as to leave a considerable space between the outer wall of the tank and the inner edge of thebalile such as would accommodate a maximum amount of warpage of the tank. While this clearance between the batllev and the walls of the tank permitted the lowering of the tank into the jacket, it seriously impaired the effect of the baffle. Therefore, a more specific object of the present invention, is to provide a jacketed tank and a. method of manufacturing the same, which will permit the use of baflies in coated tanks and yet overcome the disadvantages above set forth.

Other advantages and objects of the present invention will become more apparent from the following description, reference being made to the accompanying drawings in which the preferred embodiment of the invention is. illustrated. The novel features of the invention will be stunmarized in the claims.

In the drawings, Fig. 1 isa side elevation of a jacketed tank. or kettle constructed in accord with the invention, certain parts thereof being broken away to more clearly illustrate the internal construction; Fig. 2 is a view similar to Fig; 1 illustrating a modified form of, baffle arrangement; Figs, 3, 4 and 5 are fragmentary vertical sections taken generally along the lines 5-5 of Figs. 1 and 2 and illustrating respective steps in the method of manufacturing the tank; Fig. 6 is a fragmentary perspective view illustrating the baiiles in place, certain portions being broken away tomore clearly illustrate the construction; and Fig. '7 is a sectional view similar to Fig. 4 but illustrating a slightly modified method of securing the baffle in place.

Referring now to thedrawings in detail, and particularly to Fig. 1, it will be seen that the kettle or tank illustrated therein comprises a cylindrical open topped metal kettle l0 substantially closed at its lower end and provided with an internal coating I l of a material which has been fused to the internal surface of the kettle. Prior to the fusing of the coating, flanges l2 and M are applied to the exterior of the tank adjacent its upper and lower ends respectively. These flanges facilitate the securing of a hollow metallic jacket (5 to the kettle, as for instance, by welds I 6 and I1 without affecting the fused coating ll. At one end of the tank, as for instance the bottom, the jacket is provided with an inlet 18 and at the other end, as for instance adjacent the top, the jacket is provided with an outlet l9. The inlet and outlet are so arranged as to accommodate conduits, generally indicated at 20 and 2 I, whereby a fluid heat transfer medium may be forced into the space between the jacket and the tank.

To insure contact between the circulatin heat transfer medium and all areas of the tank, baflie member are provided. These baffles, as shown, comprise plate-like members which extend transversely between the internal surface of the jacket and the external surface of the tank. Generally there are a series of these baffles, for instance indicated at 25a, 25b, 25c and 25d in Fig. 1. Each baiile member extends around the tank and is spaced above or below the adjacent baille member to provide circulation passageways. Alternate baflies are provided with openings or gaps at alternate sides of the tank. For instance, the baflle 25a is provided with a gap or openin 26a at the right hand side of the tank (Fig. 1), whereas the baflle 25b is provided with a gap 25b at the opposite side of the tank, thus causing the heat transfer medium to circulate from one passageway to another, as indicated by the arrows 21 in Fig. 1. These baiiles may extend diametrically around the tank as indicated in Fig. 1 or they may comprise a single bafile member which is spiralled around the tank as indicated in Fig. 2. In the latter instance, they form a spiralled passageway from the inlet to the. outlet and the, openings or gaps 26a heretofore mentioned are then omitted.

The baffles 25 are carried as shown in Figs. 3 and 6, by a support 30. This support comprises an angle, one leg 3| of which is secured to the interior of the jacket as for instance, by welds 32 and the other leg 33 of which extend inwardly from the jacket toward the tank wall ill, a distance somewhat over half of the distance between the inner surface of the jacket and the outer surface of the tank wall. The leg 33 of the support carries a plurality of segmental baffle members or plates 40 which are arranged to be slid inward along the support into contact with the tank wall as shown at 4! in Figs. 3 to 6. These arcuate batlle plates 40 are spaced a slight distance from each other as indicated at 42 (Fig. 6) to permit them to be moved freely inwardly without binding one against the other. Secured to each baille plate adjacent its ends are upwardly extending ears or lugs 44 which are threaded to receive the bolts 45. The jacket I5 is provided with a series of openings 46 aligned with the openings in the lugs 44 and through which the bolts 45 may be passed permitting them to be inserted in the lugs from the exterior of the jacket.

In assembling the structure, the baffles 40 and the positioning bolts 45 are mounted in the jacket with their positioning bolts 45 in the position shown in Fig. 3. The kettle or tank is then lowered into position within the jacket and 4'! of these bolts are then welded in position as indicated at 48 on Fig. 5, thus securing the bolts in position and sealing the openings 46 in the jacket wall.

Inasmuch as the bailie plates 40 are segmental it is obvious that they may be moved into intimate contact with the external surface of the tank and will substantially compensate for any warping of the tank which causes variations in the distance between the tank and the jacket at various points as indicated by the broken lines in Figs. 3 and 4.

In Fig. 7, I have shown a modified method of construction wherein the baflle plates 40:: are laid on the supports and spot-welded in place by means of a welding rod 5| which has been passed through the opening 48 of the jacket wall.

After the welding takes place a suitable plug or cover member may be welded to the outer surface of the jacket as indicated at 52, to make the jacket liquid tight. A tool, such as rod 53, may be inserted in one of the openings and used to hold the baiiie in place while it is being spotwelded at the same or another point. While the form shown in Fig. 7 may perhaps seem more economical in construction, it has been found that the preferred form, namely, that using the positioning bolts has the advantage of facilitating repairs to the tank or kettle if such be needed. The heads of the bolt may be severed from the jacket wall by a cutting torch, whereupon the tank may be removed from the jacket. The bolts may. then be removed and replaced with others following the repair of'the unit.

After the baiiies have been positioned, the jacket may be welded to the tank flanges I2 and I4 in the usual manner thus providing a very eflicient tank which, due to the number of individual arcuate bafiie units, enables them to maintain comparatively close contact with the wall of the tank despite discrepancies in the shape of the tank, thus insuring a high degree of circulation of the heat transferring medium and thereby greatly increasing the efficiency of the tank.

Reference is made to my divisional application, Serial No. 472,329, filed Jan. 14, 1943, for claims relating to the method of making my improved tank or kettle herein described.

I claim:

1. A jacketed tank or container comprising nested inner and outer shells having their walls spaced apart, partition means extending between said walls and comprising a support secured to the outer shell and extending toward the inner shell but spaced a substantial distance therefrom, a plurality of independent members mounted on said support to bridge the space between the support and the inner shell, said outer shell having a plurality of opening therein, and means projecting through such openings to maintain said members into contact with the inner shell.

2. A jacketed tank comprising an inner and an outer shell spaced from each other, baflie means disposed between said shells and providing a partition in the space between the two shells, said baflle comprising a support carried by said outer shell and providing a surface extending toward the inner shell but spaced therefrom, a plurality of individual plate-like members supported by said surface and positioned to close the gap between said surface and the inner shell, and means secured to the exterior of the jacket to secure said members in position.

3. A jacketed tank or container comprising nested inner and outer shells having their walls spaced apart, partition means extending between said walls and comprising a support secured to the outer shell and extending toward the inner shell but spaced a substantial distance therefrom, a plurality of independent members mounted on said support to bridge the space between the support and the inner shell, said outer shell having a plurality of openings therein and bolts projecting through such openings and in threaded engagement with said members to retain said members in contact with the inner shell, said bolts having head portions secured to the outer shell and closing said openings.

CARL S. BROWN.

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