US1908198A - Return bend and method of forming the same - Google Patents

Description

May 9, 1933. J. E. TRAINER RETURN BEND AND METHOD OF FORMING THE SAME I 4 Sheets-Sheet '1 Filed Oct. 30 1929 Fig--5- INVENTOR ATTORNEYS.

May 9, 1933. J. E. TRAINER RETURN BEND AND METHOD OF FORMING THE 4 Sheets- Sheet 2 Filed Oct. 30, 1929 n| III.

INVENTOR I ATTORNEYS.

y 9, 1933- J. E. TRAINER 1,908,198

RETURN BEND AND METHOD FORMING THE SAME Filed Oct. 30, 1929 4 Sheets-Sheet 3 INVENTOR May 9, 1933. J. E. TRAINER RETURN BEND AND METHOD OF FORMING THE SAME Filed Oct. 30 .1929 4 Sheets-Sheet 4 INN/Eg FOR I ATTORNEYS.

Patented May 9, 1933' UNITED STATES JAMES E. TRAINER, OF BABBERTON, OHIO, ASSIGNOB TO THE BABCOCK & WILCOX PATENT OFFICE.

COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY RETURN BEND AND METHOD OF FORMING THE SAME Application filed October 30, 1929. Serial No. 403,506.

This invention relates to a novel and improved form, of return bend for securing together a plurality of tubes, and also to a novel methodof forming such a bend.

The invention will be best understood from the following description and the annexed I drawings, in which I have shown selected embodiments of the return bend and the method of making the same. In the drawings,

Fig. 1 is a plan view of the die and parts therein shown in Fig. 2.

Fig. 2 is a section on the line 2-2 of Fig. 1 and showing part of one step in the method. Fig. 3 is a view corresponding to Fig. 2 but showing another part of the same step.

Fig. 4 is a view partly in elevation and partl in section, illustrating the finished re-' turn nd.

' Fig; 5 is a view illustrating the bending of a tube as the initial step in making a different formof the invention.

Fig. 6 illustrates the step following that shown in Fig. 5.

Fig. 7 illustrates the method of forming the flange on the bend appearing in Fig. 6

Fig. 8 illustrates the bend after the flange is formed.

9 is a vertical sectional view ofa tubular member to be secured to the structure appearing in Fig. 8.

Fig. 10 is a V16W- of the completed bend,

partly in section and partly in elevation, the

section being taken on the line 101() of Fig. 11. l I

Fig. 11, is a view at right angles to Fig. 10, partly in elevation and partly in section, the section being taken on the line 11-11 of Fi .12.

ig. '12 is an end view ofthe bend appearing in Fig. 11. i v I Q Fig. 13 is an elevation showing my inven- 1 tion as embodied in an interdeck superheater, this figure showing the form of invention disclosed in Figs. 5 to 12 inclusive.

Fig. 14- is ,a view similar to Fig. 13 but showing the form ofinvention disclosed in Figs. 1, 2, 3 and 4.

. The invention consists primarily in providing a return bend which embodies means for cleaning the tubes which are connected by the axes of the branches2 and 3. These holes may be formed by drilling or any other suitable method. -The bend is then heated to flanging heat and placed within a suitable die 6. This die is of a form which will grip the return bendsecurely and will hold it'against 70 deformation during the subsequent steps performed thereon. For that purpose, it is pr 0- vided with parts engaging the walls of the branches, as plainly shown in Figs.'2 and '3, and another part 7 engaging the return bend between the holes 4 and 5.

Suitable mandrels 8 are then placed in the two branches, as shown in Fig. 2, each mandrel having a nose 9 of a size to be received in the holes 4 and 5. The mandrels are then pushed down through the .holes, as illustrated in Fig. 3, this operation resulting in the for mation of flanges 10 surrounding each of the holes 4 and 5 which have now become relatively large openings of substantially the same size as the internal diameters of the branches 2 and 3, and substantiallyin alignment therewith. The operation just described may be It is to be performed in any suitable mechanism such as a hydraulic press.

I next weld to each of the flanges 10 a tubu lar member 11 of substantially the same internal diameter as the branches 2 and 3 so that the resultis an H-shaped return bend havin the two branches 2 and 3 which are capable of'being secured to the tubes as by welding or other well-known means and forming-substantial extensions of these branches are the members 11 through, which the tools may be inserted for the purpose of cleaning the tubes connected to the branches. The two- 45 and'therefore, are of one 5 threaded to receive a plug 13 exemplifying a detachable closure, and this plug may be welded as indicated at 14 to aid in holding it in position. This welded joint may be cut when it is desired to remove a plug.

7 Referringnow to Figs. t012 inclusive, the

invention is here shown as comprising a bend having a single opening through which any one of the plurality of branches may be reached by cleaning tools. In practicing the 15 invention according to the disclosure in these 'figures, I first bend a section of tubing to form a bend 15, as shown in Fig. 5, suitable dies 16 and 17 being employed for this purpose. The bend is next cut, as shown in Fig.

6, to remove a portion 18 therefrom, thus forming an opening. The bend is next sec relyclamped in a holder designated 19 in' ig. 7, and the edge portion 20 of the opening is acted on by a suitable'tool designated 21 in F i 7, this tool spinning the portion 20 outwar ly to form a flange 22sur'rounding the opening, this flange appearing in Fig. 8. I

In Fig. 9. is shown a tubular member 23 having an end portion 24 of the same internal dimensions as the flange 22. The member 23 isgplaced in" position on the flange 22 and .welded to the bend. This member is inter? nally threaded, as plainly shown at 25 and p is rovided with a plug 26.

each of Figs. 13 and 14 is shown an interdeck. superlfeaterdisposed between banks of water tubes 27 and 28. This super- Q heater comprises headers 29 and 30 connected 4 to ether by tubes which are shown as having 'su stantially straight parallel 1 portions :31 joined togetheriby return bends. At their outer ends, removed from the headers, these bends 32 are formed by bending the tubes which they join'together.

.bers being adapted to receive closure members. piece with .the tubes I 110 .be used with other forms of apparatus where 2.'The method of providing means for" cleaning tubes connectedby a return bend, said bend having a plurality of'branches adapted to be connected to said tubes, which 7 comprises forming an opening in said bend communicating with at least one 'of said branches, forming a flange surrounding said opening, welding a tubular member to the "flange, and-securing a closure member to said tubular member; V

3. The -method of providing means for cleaning tubes connected by a return bend, said bend having a plurality of branches adapted to be connected to'saidtubes, which comprises drilling a small hole insaid bend substantially on thev axis of one of said branches, heating said bend, inserting aman drel into said branch with a portion thereof in said hole, forcing said mandrel through the hole to form a flange surrounding it, welding a tubular member to said flange substantially in line with .said branch, and aflix- .1

, '4. A forged metal return bend having aing a closure member to the tubular member.

plurality of branches connected together by a curved portion openings in said curved ortion substantlally in line with said ranches, and tubular members each having an end portion of substantially the same internal dimensionas one of said openings and welded to the wall thereof, said tubular mem- 1 JAMES TRAINER.

In Fig. 13 the return bends, at-the inner ends 'of the tubes, near the headers, are

.formed according tojmy invention as dis-, clesed'in'Figs. 5 to 12 inclusive. ,At .32 is indicated a bend formed separately and, joined. to the adjacent-tubes by welding at 33 and34. '-.At 35 are shown bends formed by bending one end of a tube 31 and joining it to the end of the adjacent tube by welding. at-36. This form of my invention may be practised with either kind of bend. y

In Fig. 14 the tubes 31 have their inner ends welded to the branches of bends constructed in the manner disclosed in Fig. 1, 2, 3 and 4,

this form of bend being preferably'made asa separate fitting.

While I have shown the invention asiused v in connection with a'certain kind of superheater, it is to be understood that it" may

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