Pipe joints or couplings – With casing – lining or protector – Insulated
Patent
1991-10-23
1994-01-25
Reese, Randolph A.
Pipe joints or couplings
With casing, lining or protector
Insulated
285148, 285286, 285363, 285405, F16L 1112
Patent
active
052809650
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention refers to a form-fitting and material-locking pipe connection, in particular electrically insulating pipe connection between (a) an overlapping, reinforced plastic sleeve which is subdivided into a number of superimposed pipe shells or pipe layers which at their ends have a flange directed toward the axis of the sleeve and which are separated from each other so as to be deformable independently from each other in axial direction of the sleeve, and b) at least one pipe, preferably two pipes, made especially of metal which are overlapped by the pipe shells or pipe layers, with the end of the plastic sleeve being wound, pressed or cast onto the end of the overlapped pipe, and with the flanges of the innermost pipe shell or pipe layer hooking onto a shoulder provided at each end of the overlapped pipe, and with the outermost pipe shell or pipe layer being possibly enclosed at least in the end area thereof by a coupling ring.
In connections of this type, it is known (DE-OS 27 33 048) to assign a separate shoulder of the overlapped pipe to each flange of the pipe shell, with these shoulders being of stepped configuration, with the gradation starting to ascend from the pipe end. Such a design necessitates a material accumulation at the pipe ends and also a relatively long thickened section at the end of the pipe so that a considerable material accumulation in particular in case of large connections is encountered. Furthermore, the making of individual shoulders at the pipe end is cumbersome and complicated.
SUMMARY OF THE INVENTION
The invention is now based on the object to attain a simplified design of the pipe connection, and yet to retain the effect of the known connection with regard to the even and simultaneous support of the pipe shells.
This object is attained in accordance with the invention by mutually supporting the flanges of the pipe shells or pipe layers, possibly via an interposed ring or ring winding preferably arranged perpendicular to the axis of the sleeve with the ring being provided for example with a projection which is disposed between adjacent axial surfaces of neighboring pipe shells or pipe layers, but being preferably fixed to only one of these pipe shells. Through the mutual support of the flanges of the pipe shells, the provision of only one shoulder at the pipe ends is sufficient even at great dimensions (nominal widths over 1000 mm), so that the enlargement at the end of the pipe and also its prolongation in axial direction can be kept small in comparison to the design as set forth above. The pipe shells are, however, axially movable relative to each other only within the cylinder part, with the pipe shells becoming effective simultaneously and evenly during load upon the pipes, and yet the design allows a considerable simplification of the attachment of the slip layers. The design of the pipe connection in accordance with the invention thus facilitates the making thereof and improves the utilization of material in comparison to the coupling as set forth above. Furthermore, in case the plastic sleeve is made through winding, the design of the pipe connection in accordance with the invention allows a reduction of the winding angle of the outermost shell relative to the generatrix so that the stiffness of the outer shell is augmented. This effect is accomplished by reducing the axial opening of the outer shell in comparison to known designs in which the stepped configuration of the shoulders requires a relatively great outer diameter of the outer shell. The winding angle of the one support shell is defined in accordance with the Clairaut's law by the ratio of the largest and smallest diameter of the shell according to the formula ##EQU1##
The ability to reduce the axial opening of the outer shell and thus to reduce the winding angle results in an increase of the stiffness of the outer shell so that a thickening of the outer shell and the provision of slip surfaces between the shells in cases of smaller loads can be completely omitted. Howe
REFERENCES:
patent: 2504634 (1950-04-01), Boschi
patent: 3146005 (1964-08-01), Peyton
patent: 4147381 (1979-04-01), Schwarz
Chun Heather
Reese Randolph A.
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