NL8101593A - Plastics pipe with longitudinally extending grooves - the grooves being undercut to define narrow slits on the outer surface of the pipe - Google Patents

Abstract

A plastics pipe (5) is provided with longitudinally extending grooves (8) which are undercut to define narrow slots (9) on the outer surface of the pipe. The grooves extend over the whole length of the pipe and the slots are defined by rounded regions (19,20) which merge into planar sections (23,24) which diverge at an angle of between 5-175 (pref. 90) deg. A pref. pipe is of PVC. The pipe can be easily made by extrusion in a flash free manner and finds particular use, when surrounded by a sleeve contacting its outer surface, as a well pipe, several sections being joined (as by collars, welding or adhesive) for this use.

Description

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The Applicant mentions as inventor Heinz Fehrmann in Haren (B.R.D.).

Short designation: plastic source tube.

The invention relates to a plastic source pipe with an outer wall and an inner wall, longitudinally extending intermediate walls which extend between the inner wall and the outer wall, wherein the channels formed by the intermediate walls are connected to the outer side of the 5 channels through bores in the outer wall of the pipe and the channels on the inside of the well pipe open by local removal of the inner wall.

Such a plastic source tube is known. In this known long-length well pipe, the outer wall is provided with slots which form a connection between the outside of the plastic well pipe and the inside of the channels, through which liquids can penetrate from these surroundings into these channels and through the capillary action prevailing in these channels. , can take off. On the other hand, in order to collect the liquid penetrating into the channels, the inner wall of this plastic source tube is additionally locally slotted.

A drawback of such plastic source tubes is that local slit-shaped removal of the inner wall of such plastic source tubes is difficult to carry out and requires a lot of time and labor, while the slits formed lead to a reduction in the tube strength.

The object of the invention is now to provide a plastic source pipe of the above type, wherein these drawbacks do not arise.

This object is achieved according to the invention in that both the inner wall and the outer wall are locally slit-shaped and the wall parts on both sides of the trench-shaped removal firmly cooperate with a tube-casing part.

When such a casing part is used, it is no longer forced to provide the inner wall of a plastic source pipe with slots locally by removing this inner wall, whereby the required machines can be dispensed with. It is now possible to work with plastic source pipe parts which are fixedly connected to each other by a pipe casing part.

Advantageously, the bores in the outer wall form slots extending parallel to the direction of the channels and extending over the entire lengths of a pipe section located between two successive local removals of the inner wall and outer wall.

Particularly advantageously, the casing part is fixedly connected to the outside of the outer wall of the plastic well pipe by means of an adhesive joint, which contributes to considerable reinforcement of the plastic well pipe.

The casing is expediently crimped on the outside of the outer wall of the plastic well pipe.

15 '* It is recommended to provide the plastic well pipe with threaded end parts, which can be connected to pipe parts with internal thread of equal pitch.

The invention will now be elucidated on the basis of an exemplary embodiment with the aid of the drawing, in which fig. 1 shows a cross section of a plastic well pipe according to the invention;

Fig. 2 a section on the line II-II,

Fig. 3 is a sectional view taken on the line III-III and FIG. 4 is a perspective view of part of a plastic source tube according to the invention and FIG. 5 a detail of a section according to the line III-III.

Fig. 1 shows a plastic well pipe, comprising a first plastic well pipe part 2, a second plastic well pipe part 3 and a third plastic well pipe part 4, which parts are connected to each other by casing pipe parts 18, which are bonded to the material by means of an adhesive connection 6. outside of the pipe sections 2, 3 and 4 made of polyvinyl chloride or a polyester resin.

Instead of a glue connection 6, use can also be made of shrunk casing pipe parts 18, which then provide a fixed connection between two successive plastic source pipe parts.

Each plastic source pipe part 2, 4 consists of an inner wall 5, an outer wall 6 and connecting walls 7 extending between inner wall 5 and outer wall 6, which form an integral unit with the inner wall and the outer wall.

In order to form a connection between the channels 8, which are bounded by the inner wall 5, the outer wall 6 and two adjacent intermediate walls 7, slots 9 are provided in the outer wall, which extend into the channels. These slots are effectively designed as longitudinal slots.

The slots 9 extend from the end end 14 to the other end end 11 of a plastic source pipe section 2, 3 or 4, whereby for example water flows optimally from the outside into the channels and from there into the inside 12 of the plastic source pipe. .

Care must be taken that when applying a glue connection 9 between the inside of casing part 5 and the outside of the outer wall 6 of plastic source pipe part 2, the channels are not completely closed by glue, since then no liquid from the outside the inside 12 of the plastic source-20 pipe can flow. Namely, if the slots 9 continue to the end ends 11 and 14 of a pipe section 2, 3 or 4, this means that, of course, liquid flows directly through the slots 9 into the plastic source pipe 12.

Coupling parts 15 are attached to the ends 13 and 14 <3, with external threads 16.

With the aid of this screw thread, it is easy to connect such a plastic source pipe to a filter, respectively. riser.

As can be seen, between the parts 2 and 3, the inner wall and the outer wall are slit-shaped to form a slit 17.

It will be clear that according to the invention such a plastic source pipe can be manufactured considerably more easily than a plastic source pipe, whereby the inner wall must be locally slit-shaped.

8101593 -4- X i

In the embodiment shown in Fig. 1, the slot 17 extends over the entire circumference of the plastic well pipe 1. It will be clear, however, that it is also possible to provide the slot 17 only over a certain part of the circumference of the plastic well pipe, so that the parts 2, 3 and 4 are still connected to each other by small plastic well pipe parts. In that case, the casing part 13 is also necessary to obtain the desired strength of the plastic source pipe. It goes without saying that a plastic source pipe according to the invention in which the slot 17 does not extend over the entire circumference is also easier to manufacture.

According to a very efficient embodiment, the longitudinal slots 9 extend over the entire length of a plastic well pipe between two successive slots 17.

The longitudinal slots 9 can be formed by mechanical operations, such as by sawing through the outer wall of the longitudinal channels.

The provision of such continuous longitudinal slots 9 has the great advantage that it is easy to remove any plastic particles entering these channels and also any burrs 20 on the inside of the channels.

Fig. 5 shows in more detail the shape of the slots 9, which ensure the connection of the inside of the channels 8 to the outside of the plastic tube.

As can be seen, the edges 19 and 20 of the slots 9 on both sides are rounded both on the outside 21a and on the inside 21b and also on the outside 22a and the inside 22b.

Optimum flow conditions for water or other bottom liquids to the longitudinal channels 8 are achieved by this separation of the edges 19 and 20 of the slots 9, as no burrs are present on the edges of the slots, which is often the case. when using slots formed by sawing.

Moreover, there is then virtually no risk of blockage of the inside of the channels 8 by soil particles such as sand, due to the rounding of the edges 19 and 20.

The edges 19 and 20 of the slots 9 on the inside merge with particular advantage into straight channel surfaces 23 and 24 mutually enclosing an angle of 5 to 175 °, expediently 45 to 135 ° and preferably about 90 °. These straight channel planes 23 and 24 connect as tangent planes to a rounded channel cross section comprising an angle of 355 ° to 175 °, expediently 315 to 225 ° and preferably 270 °.

Such a pipe section 2, 3 or 4 extending between two successive slots Y, extending along 10 slots 9 over the entire length, provides a large liquid discharge when the said rounding is used, as appears from the following table. This table shows the water inlet cross section per 100 mm effective filter length in mm2 for a specific pipe diameter and wall thickness as well as slot width.

15 Pipe diameter Wall- Slot width in mm external thickness ----—— in mm. in mm 0.3 0.5 0.75 T, 0 1.5 48 4.4 1,200 2,000 3,000 4,000 6,000 60 5.0 1,320 2,200 3,300 4,400 6,600 20 88 5.7 1,720 2,850 4,275 5,700 8,850 113 6.4 1,980 3,300 4,950 6,600 9,900 125 6.7 2,100 3,500 5,400 7,000 10,500 160 7.4 2,400 4,100 6,150 8,200 12,300 210 8.4 2,880 4,800 7,200 9,600 14,400 25 The above-mentioned continuous slotted pipes provide the following results when used as a well pipe, with material consumption compared to a tube with a solid wall. The fluid outlet cross-section for all longitudinal channels is also shown for each well pipe. From this value, the length of the number of pipe parts of a given length can always be calculated to form a well pipe of the required capacity.

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8101593

Claims (11)

Plastic well pipe according to claim 1, characterized in that the intermediate walls (7) are equally spaced over the circumference of the pipe. Plastic well pipe according to claim 1 or 2, characterized in that the cross-section of the channels is substantially rounded. Plastic well pipe according to one or more of the preceding claims, characterized in that the bores in the outer wall (6) form slots (9) extending parallel to the direction of the channels and extending over the entire length of a pipe section located between two successive local removals / of the inner wall and outer wall. Plastic well pipe according to one or more of the preceding claims, characterized in that the plastic well pipe consists of a thermoplastic plastic, such as polyvinyl chloride. Plastic well pipe according to one or more of the preceding claims, characterized in that the plastic well pipe consists of fiber-reinforced, thermosetting synthetic resin. Plastic well pipe according to one or more of the preceding claims, characterized in that the inner wall (5) and outer wall (6) are locally removed over the entire circumference. 81 01 593 -8- * Α i * Plastic well pipe according to one or more of the preceding claims, characterized in that the ends of the plastic well pipe are provided with coupling parts (15) bearing external screw thread (16). Plastic well pipe according to one or more of the preceding claims, characterized in that the intermediate walls (7) are integral with the inner wall (5) and outer wall (6) of the plastic well pipe. Plastic well pipe according to one or more of the preceding claims, characterized in; that the pipe casing part (15) works together firmly with the outside of the outside wall (6) by means of an adhesive bond (6). Plastic well pipe according to one or more of the preceding claims, characterized in that the pipe casing part (18) is crimped around the outside of the outer wall (6) of the plastic well pipe. Plastic well pipe according to one or more of the preceding claims, characterized in that the penetrations in the outer wall (6) form slots (9) extending between two successive trench-shaped removers / of the inner wall (5) and the outer wall (6). . Plastic source pipe according to one or more of the preceding claims, characterized in that the edges (19, 20) of slots (9) are rounded. 81 01 593