FI89740C - VID FRAMSTAELLNING AV VAERMEISOLERANDE LEDNINGSROER ANVAENDBART ROERFOERBINDNINGSSTYCKE - Google Patents

Description

89740 Pipe fittings for use in the manufacture of thermally insulated conduits

The present invention relates to a pipe fitting comprising a cylindrical shaped body for use in the manufacture of thermally insulated rigid pipelines with a length of 6-18 m in a mold channel.

In connection with known methods of manufacturing thermally insulated conduits, for example, a spacer conduit together with a plastic sheath hose 10 is passed through a fixed mold tube, whereby the edges of the plastic strip are joined and welded into a plastic film hose shortly before the fixed mold tube is fed. The foamable plastic mixture is generally applied shortly before the overlapping edges of the plastic film strip formed into the plastic film strip are joined and welded to the plastic film strip. During the passage of the fixed mold tube, the annular space between the guide tube and the let-like outer sheath is then foamed.

20 In this case, an "endless" conduit is usually used, which is wound from the storage space and foamed after passing through the orienting device.

However, it is often the task to foam about 6-8 m long, mainly 12 to 18 m long cable-25 pipe pieces in a continuously operating device. In this case, it is advantageous to connect the individual pipe sections Λ v before feeding them to the flotation device as a seemingly endless pipe.

It is therefore an object of the present invention to provide a pipe connection piece which, on the one hand, ensures a secure connection of the ends of the conduit pipes and, on the other hand, acts both as a spacer in the flotation device and as a protective shield to protect the pipe ends from contamination and possible corrosion.

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The object of the invention is achieved by means of a pipe connection piece, characterized in that the cylindrical body is provided with cylindrical bores 5 concentrically formed on both sides in the direction of the cylindrical axis, terminating at a distance from each other inside the cylindrical shaped body. the outer diameter of the shaped body is the outer diameter of a cylindrical foam jacket acting as a thermal insulator.

According to the invention, these pipe fittings are made of plastic, preferably flexible plastic. Pipe fittings made of fine cellular high specific gravity polyurethane elastomers have proven to be particularly reliable. Such fine-cell polyurethane elastomers include, for example, the commercially available trademarks "Cellasto" and "Vulkolan" or these components form components A and B after mixing.

The pipe fittings are positioned relative to the bore holes formed on the cylindrical shaft so that they fit tightly at the ends of the conduit, so that no foam can penetrate between the conduit and the pipe fitting. In order to ensure that the pipe fittings remain particularly strong, a cylindrical projection is formed at the ends of the conduit at the ends of the boreholes, the outer diameter of which corresponds to the inner diameter of the conduits. After leaving the flotation device, the pipe fittings are sawn in the middle-3 CT 'crosswise' perpendicular to the camp axis. The halves of the pipe fittings then remain as protective sheaths at the ends of the conduit. After cross-cutting, the half of the pipe joint and the foam layer are separated from each other, for example by means of a suitable groove blade, so that 35

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before installation, the pipe ends can be left in a clean place by pulling off the protective cover. The pipe ends thus released are then connected tightly and permanently together in the usual way by means of sleeves.

5 Since the continuous application of the foamable mixture to the separating film does not prevent the foamable mixture from being completely pushed out of the cylindrical pipe fittings, it has proved advantageous to use cylindrical shaped bodies in which at least one come into contact with the mixture to be foamed at all when feeding into the mold channel. In connection with flotation, the foam under the pipe fitting can then protrude forwards and backwards.

The present invention will be described in more detail below by means of a particularly preferred embodiment of a non-limiting nature with reference to the accompanying Figures 1-6.

The reference numbers in the figures and the description have the following meanings:. . ·. 1 pipe connection 2a, 2b forming a cylindrical or angular body 25, concentric boreholes 3 thermally insulated conduit ends 3a conduit without thermal insulation 4 heat-insulating foam jacket: ·· 30 5a, 5b cylindrical protrusions 8: 9a, 9b front sides of the molded part 1 *! ' 10 circumferential recess 35 · 9 V h '4' w

Figure 1 shows a longitudinal section of two thermally insulated conduit pipe ends 3 connected together by a pipe connection piece 1 according to the invention.

Fig. 2 shows, as in Fig. 1, a longitudinal section of the two thermally insulated conduit ends 3 connected together by means of a pipe connection body 1 according to the invention, this pipe connection piece 1 being further provided with cylindrical projections 5a, 5b.

Fig. 3 shows a cross-section of the cylindrical pipe joint body 1 according to the invention according to the invention taken along line A-A.

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Figures 4 and 5 show possible further cross-sections of the pipe connection piece 1 according to the invention shown in Figure 1 taken along line AA, the jacket segments 6 or 7 being cut from 20 basic cylindrical moldings 1. Such moldings 2a can of course be extruded directly and properly cut. 2b.

These embodiments are advantageous in that they make it possible for the pipe fittings 1 to ensure the centering of the pipe ends in the mold channel in each position, whereby the foamable mixture placed on the film strip under the pipe fitting 1 can protrude backwards during foaming. from paragraph 1.

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Figure 6 shows a further embodiment of a pipe fitting 1 according to the invention provided with a circumferential recess 10. In connection with this embodiment, the pipe fitting 1 5 comes into only slight surface contact with the foamable mixture, which can be squeezed out relatively easily. The foamable mixture between the front faces 9a, 9b then fills the circumferential recess 10 during flotation.

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The embodiments described above indicate that various additional modifications may be made within the scope of the present invention by those skilled in the art.

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Claims (9)

A pipe fitting comprising a cylindrical shaped body (1) for use in the manufacture of thermally insulated rigid pipelines with a length of 6-18 m in a mold channel, characterized in that the cylindrical shaped body (1) is provided with cylinders 2 concentrically formed on both sides along the cylindrical axis ) terminating some distance from each other at the end of the cylindrical shaped body si -10, the diameter of the cylindrical bores (2a, 2b) corresponding to the outer diameter of the thermally insulated pipelines (3) and the outer diameter of the cylindrical shaped body (1). 13 Pipe connection piece according to Claim 1, characterized in that the ends of the boreholes (2a, 2h) are provided with a cylindrical projection (5a, 5b) whose outer diameter corresponds to the inner diameter of the guide pipes (3a). 20 - - · A pipe connection according to claims 1 and 2. : body, characterized in that at least one cylindrical jacket segment (6) is cut from the cylindrical shaped body (1) in the direction of the cylindrical axis. 25 Pipe fitting according to Claims 1 and 2, characterized in that four cylindrical jacket segments (6) are cut in this way and that a circular cross-section is formed from a circular cross-section (1). ! * I Pipe connection piece according to Claims 1 and 2, characterized in that three cylindrical jacket segments (7) are cut in this way and have r. - · \ t-j f '<f i 4 fj 7 formed a triangular shaped body of equilateral cross-section, the three tips of which are in a cylindrical shell (8). Pipe fitting according to Claim 1, characterized in that the cylindrical body is provided with a recess (10) extending at a distance from one front side (9a) to a distance from the other front side (9b) and externally at a distance from the inner boreholes. Pipe connection piece according to Claim 1, characterized in that it is made of plastic. 15 Pipe connection piece according to Claims 1 and 2, characterized in that it is made of elastomeric plastic. Pipe connection piece according to Claims 1 to 3, characterized in that it is made of - snowy polyurethane elastomer. ^ 9740 e "