Pipe joints or couplings – With assembly means or feature – Guide and support
Patent
1992-07-21
1995-01-03
Arola, Dave W.
Pipe joints or couplings
With assembly means or feature
Guide and support
285 39, 285256, 285259, 285351, F16L 3500
Patent
active
053780230
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a pipe connection, particularly for composite pipes. At best, such a known construction, as described in U.S. Pat. No. 1,825,005, creates a permanently tight connection for fabric-reinforced rubber hoses, but not for plastic or composite pipes, since the design of the connection region of the supporting sleeve does not ensure a reliable immobilization, which is able to cope with the temperature and pressure fluctuations of a medium flowing through the pipe.
For a further, known pipe connection (European patent B-0 159 997), the pipe ends on the connection region of the supporting sleeve are pressure-molded by an intermediate sleeve, which in turn is molded in axial and radial directions by a shaping ring, as the latter is pushed onto the intermediate sleeve, and exerts strong axial and radial pressing effects on the walls of the pipes. For such a construction, for which the material of the intermediate sleeve has to fill up completely the space between the inside of the shaping ring and the outside of the pressure-molded pipe end and, at the same time, experiences bilateral deformations, high pressures are required for installing the pipe connection. These high pressures adversely affect the structure of the pipe wall material and decrease the strength and sealing function of this material. Moreover, the applying of such high pressures at building sites is problematical. Such pipe connections are therefore expensive to install. They require precision-made intermediate sleeves and shaping rings and are hardly able to compensate for the tolerances in the cross sectional dimensions of the pipes that are permitted by the Standards Association. The expensive design of the pipe connection with the intermediate sleeve and the shaping ring increases the overall diameter of the pipe connection appreciably.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a pipe connection particularly for composite pipes, which brings about a permanently secure and tight connection of pipes with little expenditure for construction and installation.
The invention creates a pipe connection with a deformable, external pressure sleeve, which provides an end region of the pipe, which is between this pressure sleeve and a connection region of the supporting sleeve, With an undulating deformation with zones of different compaction while avoiding stress concentrations, and brings about a gentle, structure-retaining, reliably sealing immobilization of the end of the pipe. An elastomeric ring-shaped body can act as a holding element for the supporting sleeve, as a sealing ring directly opposite a depression and/or as a separating and sealing element between the front end of a composite pipe and the shoulder of the supporting sleeve. The external diameter in the region of this pipe connection is enlarged only insignificantly relative to the external diameter of the pipe ends. Due to the gentle deformation of the end regions of the pipe, such a pipe connection can be used particularly for composite pipes, especially aluminum/plastic composite pipes, since there is no damage due to cutting or shearing effects or to stress concentrations in the region of pressure.
With respect to significant further advantages and details of the invention, reference is made to the following specification and the drawing, in which an embodiment of the object of the invention is illustrated diagrammatically in greater detail. In the drawing,
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a partial axial section of an inventive pipe connection with two connection regions in an uncompressed state in region A and in a compressed state in region B,
FIG. 2 shows a detailed representation of a supporting sleeve of FIG. 1 with pre-installed ring-shaped bodies,
FIG. 3 shows an enlarged, detailed representation of a connection region of the supporting sleeve of FIG. 2,
FIG. 4 shows a detailed representation of the supporting sleeve with modified main ring-shaped beads,
FIG. 5 shows a detailed r
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Arola Dave W.
Hewing GmbH
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