Pipe joints or couplings – Elbow
Patent
1984-07-03
1986-04-22
Arola, Dave W.
Pipe joints or couplings
Elbow
285293, 285373, F16L 2500
Patent
active
045837708
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a pipe joint seal comprising an insert of elastic material, such as rubber, adapted to be mounted longitudinally around the joint and the pipe sections adjacent thereto, and a union piece of, for example, sheet metal or plastic adapted to be clamped around said insert.
Pipe conduits are supplied in pipe sections comprising a fluid-conducting pipe, an insulation around said fluid-conducting pipe, and a jacket pipe around said insulation. The fluid-conducting pipe projects at both ends of the pipe section from the insulation and the jacket pipe for welding to other pipe sections. After welding, a connection piece is pushed over the joint, and the ends of the connection piece are connected to the outer side of the jacket pipe by means of shrinkdown tubing. The space defined by the joined-together ends of the fluid-conducting pipes, the pipe insulation and the connection piece is filled with polyurethane foam which is foamed on site. In this manner, a reliable connection is established between the jacket pipe and the connection piece, but the foaming operation is detrimental to health, and one therefore aims at insulating the joint in some other manner. One solution is to provide the connection piece over the joint with a widened portion which is provided with an insulation already in the factory. As in the case mentioned above, the connection piece is pushed over the joint so that the widened portion with the insulation will lie above the point where the fluid-conducting pipes are exposed, and the connection piece is connected to the jacket pipes in the above-mentioned manner. However, a connection piece provided with a widened portion will be exposed to the axial forces which are caused by temperature variations in the pipes and which may become so great that the shrinkdown tubing succumbs. To solve this problem, the connection piece is anchored in the ground, while the jacket pipes are allowed to move freely in the connection piece. However, changes in length of up to 100 millimeters frequently occur, and it will be appreciated that a very strong and reliable seal is required at the ends of the connection piece.
It is the object of this invention to provide such a seal.
To this end, the insert mentioned by way of introduction has, in its inner side engaging the pipes, longitudinal grooves widening away from said inner side and filled with a plastic sealing compound which retains its plasticity at the prevailing temperature and pressure variations.
The invention will be described in more detail below, reference being had to the embodiments illustrated in the accompanying drawings.
FIG. 1 is a perspective view of a seal according to the invention, comprising an insert of elastic material over which a sheet-metal union piece is provided.
FIGS. 2a-2d illustrate different embodiments of the inner side of said insert.
FIG. 3 is a sectional view of a seal connected to a joint.
FIG. 4 is a sectional view showing how the seal is mounted.
The seal illustrated in FIG. 1 comprises an insert 10 of elastic material, such as rubber. The insert 10 is provided in its inner side with recesses, as is best seen from FIGS. 2a-2d. According to FIG. 2a and FIG. 2d, these recesses are in the form of dovetailed recesses which extend longitudinally of the insert and which may also have the modified form illustrated at 11' in FIG. 2b. The recesses may also be semicircular, as shown at 11" in FIG. 2c. On either side of the said recesses 11, 11' and 11", the inner side of the insert may be formed with grooves 12 forming a longitudinal fluting of a depth far shallower than that of the recesses 11, 11', 11". When the seal is used for connecting pipe sections by means of connection pieces, it is stepped on its inner side, as is shown at 13 in FIG. 2a and FIG. 2b so that it can tightly engage the outer side of both the main pipe and a connection piece pushed thereonto, as is explained in greater detail below. However, the seal according to the invention is intended to seal not only a connection piece on a p
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Kreku Sven I.
Lennartsson Lars K.
Arola Dave W.
Oy Wiik & Hoglund Ab
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