NL8602142A - TUBE CONNECTOR FOR USE IN THE MANUFACTURE OF THERMALLY INSULATED PIPE TUBES. - Google Patents

Description

* »VO 8337

Title: Pipe connector for use in the manufacture of thermally insulated pipe tubes.

The invention relates to a pipe connector for use in the manufacture of thermally insulated pipe conduits.

In the known methods for the production of thermally insulated conduit pipes, the procedure is, for example, such that the conduit pipe provided with spacers is passed through a stationary molding pipe together with a plastic foil hose acting as a protective jacket, whereby the joining and welding together take place. from the edges of the plastic tape to plastic foil hose takes place just before insertion into the stationary molding tube. The plastic mixture to be foamed is usually applied to said plastic tape shortly before joining and welding the overlapping edges of the plastic film tape formed into plastic film hose. During the passage through the stationary molding tube, the foaming of the annular space between the conduit tube and the tubular, protective outer jacket takes place.

Usually, an "endless" conduit tube is used, which is unwound from a supply roll and surrounded with foam after passing a straightening tool.

It is often also the intention here to surround pipe sections of length of about 6 to 18 m, preferably in lengths of 12 to 18 m, with foam all around by means of a continuously operating installation. For such purposes, it is then advantageous if the individual conduit pipe pieces are joined into a quasi-endless strand prior to insertion into the all-round foam installation.

The object of the present invention is now to develop a pipe connection piece 25, which on the one hand ensures a safe and reliable connection of the pipe conduit ends and, on the other hand, fulfills both the task of a spacer in the foam installation and of a protective cap, in order to ensure that the pipe ends are in place destination, to be protected against pollution and possible rust.

According to the invention, this object is achieved by a tube connecting piece, which consists of a cylindrical shaped body with two S θ ö 2 1 4 2 concentrically arranged in each direction in the direction of the cylinder axis.

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-2- cylindrical bores, said cylindrical bores terminating spaced apart in the cylindrical shaped body and the diameters of said cylindrical bores corresponding to the outer diameter of the thermally insulating conduit tubes and the outer diameters of the cylindrical shaped bodies having the outer diameters of the cylindrical, thermally insulating foam jackets.

According to the invention, the pipe connecting pieces consist of plastic, preferably of elastic plastic. Tube connectors, which consist of polyurethane elastomers with fine cells with a high volume weight, are particularly satisfactory. Such fine cell polyurethane elastomers are available, for example, under the registered trademarks "Cellasto" and "Vulkolan", respectively, components A and B which, after mixing, yield these products.

The pipe connectors are preferably designed with regard to the bores arranged in the cylinder shaft such that they are seated on the pipe conduit ends in such a way that no foam can penetrate between the pipe pipe and the pipe connector. To ensure a particularly firm hold of the pipe connectors on the pipe conduit ends, the bores at each end are provided with a cylindrical projection, the outer diameters of which correspond to the inner diameters of the pipe conduits. After leaving the foam all-round installation, the pipe connectors are cut in the middle perpendicular to the cylinder axis. The half pipe connectors then remain as protective caps on the pipe pipe ends 25. After sawing through, the half pipe connecting piece and the foam layer are separated from one another, for example by means of suitable cutting blades, so that the pipe ends can be exposed in a clean condition before the pipe caps are removed. The pipe ends thus released are then connected to each other in the usual manner in a sealing manner and in a durable manner.

Since the continuous application of the mixture to be foamed onto the separating film cannot prevent the mixture from being completely pushed away from the cylindrical tube connectors, it has proved advantageous if cylindrical shaped bodies are used, wherein at least one cylinder jacket segment is parallel to the cylinder shaft is cut off, so that the cut side facing the mixture to be foamed does not initially come into contact with the foamable mixture when entering the molding channel. During foaming, the foam material can then exit forwards and backwards under the pipe connecting piece.

The invention will now be further elucidated on the basis of the particularly preferred embodiment shown in Figures 1 to 6, without this however meaning that the invention is limited to that embodiment.

In the Figures and the Explanatory Notes to those Figures, the reference numerals have the following meanings: 1. Pipe connector in the form of a cylindrical or rectangular shaped body 2a, 2b Concentric bores 3. Thermally insulated pipe tube end 3a. Conduit pipe without thermal insulation 15 4. Thermally insulating foam jacket 5a, 5b Cylindrical projections in the bores 2a, 2b 6, 7 Cylinder jacket segments 8. Cylinder sleeve 9a, 9b End faces of the moldings 1 20 10. Circular recess

Figure 1 is a longitudinal section of two thermally insulated conduit pipe ends 3 connected to the invented pipe connector 1; Figure 2, like Figure 1, is a longitudinal cross-section of two insulated pipe tube ends 3, which are connected to the invented pipe connection piece 1, this pipe connection piece 1 additionally comprising the cylindrical projections 5a, 5b in the bores 2a, 2b;

Figure 3 is a cross section of an invented, cyiindrical tube connector 1 of Figure 1 along the cutting line A-A;

Figures 4 and 5 are further possible cross-sections of the invented pipe connecting piece 1 according to Figure 1 along the cutting line AA, 22, in which the sheath segments 6 and 7, respectively, are cut off from the cylindrical basic mold body 1, whereby it is of course noted that 3602142-4- in practice will extrude such shaped bodies directly and then provide them after the bore holes 2a, 2b have been suitably shortened.

It should be noted here that these embodiments are advantageous in that they provide the possibility that the tube connectors 1 ensure centering of the conduit tube ends in the tube channel in any position, and that it is located on the foil tape below the tube connector 1, mixture to be foamed can escape when foaming in front of and behind the pipe connecting piece 1; Figure 6 shows a further embodiment of the invented pipe connection piece 1 with the circumferential recess 10.

In this last-mentioned embodiment, the pipe connecting piece 1 only slightly comes into contact with the mixture to be foamed, which can be pressed away relatively easily. The mixture to be foamed between the head sides 9a, 9b then fills up the circumferential recess (10) during foaming.

The embodiments explained in the foregoing show that further possibilities for variation are obvious to a person skilled in the art, which possibilities are of course also within the scope of the inventive idea.

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Claims (9)

1. Pipe connecting piece for use in the production of thermally insulated pipe pipes, consisting of a cylindrical shaped body (1), each with a cylindrical bore (2a, 2b) arranged on both sides in the direction of the cylinder axis, which bores are spaced 5 ends apart in the cylindrical shaped body, the diameter of said cylindrical shaped bores (2a, 2b) corresponding to the outer diameter of the thermally insulating conduit tubes (3) and the outer diameter of the cylindrical shaped body (1) corresponding to the outer diameter of the cylindrical, thermal insulating foam jacket 10 (4). Pipe connector according to claim 1, characterized in that the bores (2a, 2b) are each provided at their ends with a cylindrical projection (5a, 5b), the cylindrical projections of which the outer diameters correspond to the inner diameters of the conduit pipes (3a ). Pipe connector according to claims 1 and 2, characterized in that at least one cylinder jacket segment (6) is cut off from the cylindrical shaped body (1) parallel to the cylinder axis. Pipe connection piece according to claims 1 and 2, characterized in that four cylinder jacket segments (6) are cut off in such a way that a cross-sectional square shaped body (1) of which the square-diagonal is the same is formed from the cross-sectional round shaped body to the diameter of the round shaped cross-section Pipe connector according to claims 1 and 2, characterized in that three cylinder jacket segments (7) are cut off in such a way that a shaped body is formed which defines an equilateral triangle in cross section, the three corners of which lie on the cylinder jacket (8). . Pipe connector according to claim 1, characterized in that * the cylindrical shaped body is spaced from the one end face (9a) up to 30 at a distance from the other end face (9b), from the outside to the distance of the inner bore. ) contains. Pipe connector according to claim 1, characterized in that it consists of a plastic. Pipe connector according to claims 1 and 2, characterized in that the 8602142 fillet consists of an elastomeric plastic, Pipe connector according to claims 1 to 3, characterized in that it consists of a cell-forming polyurethane elastomer. . * * JT 8 § 0 2 1 1?