Патент USA US2403670код для вставки
July 9, 1946. w. H; MARTlN ' 2,403,670 coRnosxomRmsxsmm FLUID HEATING‘ ‘TANK Filed May 30, 1944 INVENTOR. ‘WILLIAM H. MARTIN BY v ATTORNEYS Patented July 9, 1946 2,403,670 UNITED ‘STATES PATENT OFFICE 2,403,67 0 ’ CORRO SIGN-RESISTANT FLUID HEATING TANK. William H. Martin, Lakewood, Ohio, assignor, by mesne assignments, to Republic Industries, Inc., New York, N. Y., a corporation of Delaware Application May 30, 1944, Serial No. 538,000 1 Claim. (Cl. 219--38) 1 2 This invention relates as indicated to corro The most common form to which the invention is applied is the conventional cylindrical hot wa ter heating and storage tank sold for domestic use, comprising a cylinder of approximately 1 to 3 feet in diameter, and of various lengths de sion-resistant fluid heating tanks and‘ more es pecially to tanks such as are used for the pur pose of heating and storing hot water as in do mestic and commercial establishments. There has been considerable attention direct pending upon their capacity. The tank body is ed to the problem of providing corrosion-resist in its entirety provided with a coating 2 on the ant linings for tanks of this character. One type inner surface thereof of a corrosion-resistant of corrosion-resistant lining available is porce material such as porcelain enamel. lain enamel. This material is of such a nature, 10 The present invention is concerned primarily however, that when there is a local failure in with the provision of means whereby an immer any portion of the tank, such failure may not be sion heater may be removably attached to the readily repaired necessitating scrapping the en body of the tank with the heating unit thereof tire structure. extending into the tank space, the entire as A particular problem is presented in the manu 15 sembly characterized in that there are no parts facture of tanks of this character when the same exposed to the tank contents which are subject are to be provided with an immersion-type elec to corrosion. These ends are accomplished by tric h'eater which requires that the tank body be providing an opening in a local area in the tank provided with some means whereby such immer wall with the wall around such opening prefer sion heating unit may be removably secured to 20 bly ?ared outwardly for a slight extent as indi~ the tank body by means which Will not leave ex cated at 3. A tubular member 4 having an an posed any surface which will be corroded by the nular skirt 5 is arranged concentrically with the contents of the tank, while, at the same time, opening in the tank wall and with such skirt in providing a structure which can be readily as close ?tting engagement with the struck~out sembled and disassembled without damage to the -. portions 3 of the tank wall. The parts described corrosion-resistant coating on the interior of the are conveniently united by means of a ?llet weld tank. 6 such as may be secured either by gas or electric It is a principal object of my invention to pro welding operations which are conventional and vide a structure of the character described which well-known. has all of these desirable advantages. After the parts are thus assembled, the tank, Other objects of the invention will appear as or more particularly, the inner surface thereof is the description proceeds. provided with the enamel coating 2 and such To the accomplishment of the foregoing and coating extends over at least a portion of the related ends, said invention then comprises the axial extent of the inner periphery of the annu features hereinafter fully described and particu 35 lus 4. In the preferred embodiment of the inven larly pointed out in the claim, the following de tion, the coating 2 extends over the major por scription and the annexed drawing setting forth tion of the inner periphery of the skirt 5. in detail certain illustrative embodiments of the After the enamel coating has been thus ap invention, these being indicative, however, of but a few of the various ways in which the principle plied by conventional porcelain enamelling pro cedure, then an insert 1 of corrosion-resisting of the invention may be employed. material is molded in the annular recess provid In said annexed drawing: ed by the enlarged inside diameter of the skirt Fig. 1 is a fragmentary transverse sectional portion 5 of the annulus 4. This molding opera view of a portion of a tank of the character de~ tion may be accomplished by placing a die mem scribed showing in detail the features thereof 45 ber in the annulus 4 and then introducing the comprising my invention; and molding material into the space adapted to re» Fig. 2 is an end elevational view taken from the ceive the same and, after the molding material left side of Fig. 1, it being noted that Fig. 1 is_ has been permitted to solidify, the die which has taken on a sectional plane substantially indicat close ?tting engagement with the inner periph 50 ery of the outer portion of the annulus 4 is with ed by the line l-l in Fig. 2. Referring now more speci?cally to the draw drawn, whereupon the outer portion of the an ing and more especially to Fig. 1, the structure nulus 4 and the axially adjacent portion of the here illustrated comprises a tank body generally molded insert 6 are provided with a continuous indicated at l. The tank with which the inven pipe thread. . tion is associated may be of any general form. 65 It will be observed that since the enamel coat 2,403,670 3 ing 2 extends into the space occupied by the in sert 6, the latter will be in overlapping relation areas as a result of the normal stresses encoun tered either in use or incidental to assembly and with such coating insuring that there are no areas of the metallic wall I exposed to the con tents of the tank. After the parts are assembled and fabricated in the manner described, I then provide a mem her 8 which is generally annular in form and which is threaded into the threads formed on the inner periphery of the annulus 4 and molded in 10 sert 6. The annulus 8 is provided with a radially disassembly of the described combination. Other modes of applying the principle of the invention may be employed, change being made as regards the details described, provided the features stated in the following claim or the equivalent of such be employed. extending ?ange 9 at its outer end. The member able immersion-type heating element and char I, therefore, particularly point out and distinctly claim as my invention: A fluid heating tank provided with a replace acterized in that all inner surfaces of the assembly with which the tank contents come into contact faces to the contents of the tank which may be 15 are corrosion-resistant, comprising an extension subject to corrosion thereby. on the outer surface of the wall of said tank about The immersion heater unit, diagrammatically an opening therein, such extension providing a illustrated as comprising four tubular heating passage with its axis extending at an angle to the 8 is formed of a corrosion-resistant material such as brass, copper, or the like, so as to offer no sur units 10, is carried by a circular plate H likewise formed of corrosion~resistant material such as any of the metals previously mentioned. The heater units I!) may be secured to the plate I I in a variety of ways, none of which form any part of the present invention, excepting that whatever means are employed for that purpose, the mate rials used should be corrosion-resistant to the contents of the tank, at least those portions which are arranged on the inner face of the plate I l. plane of the adjacent tank wall, a corrosion resistant coating on the inner surface of said wall and extending outwardly over the inner surface of said passage, an insert of corrosion-resistant material molded in interlocking relation in said passage in overlying relation with said corrosion 25 resistant coating, a thread formed on said molded insert and the axially outer portion of said exten sion, an annular, exteriorly threaded member of corrosion-resistant material threaded into said The plate II is removably united to the passage and provided exteriorly of the tank with ?ange 9 of the annulus B by means of a plurality 30 a radially extending ?ange having engagement of spaced studs l2. with the outer end of said extension, an immer From the foregoing description, it will be ob— served that I have provided a structure in which all of the surfaces exposed to the tank contents are corrosion-resistant. A further and more ; particular advantage of my improved construc tion is that the supporting means for the im mersion unit is of such strength and rigidity and so united to the relatively thin tank wall as not to result in a flexure of the tank wall in local 40 sion-type heating unit comprising a cover plate of corrosion-resistant material removably secured over the outer end of said passage by attachment to said flange, and a heating element carried.by said plate and extending through said passage into said tank. WILLIAM H. MARTIN.