Abstract
A fitting for connecting a secondary plastic pipeline of a double pipe system containing two half-shells composed of plastic, wherein in each case each of the half-shells has an integrated heating wire, wherein the heating wire is arranged in each case in the regions of the connecting pieces and the heating wire has several meandering windings, wherein the heating wire is arranged in each case in a groove provided for this in the half-shell and the connecting elements which connect the two half-shells, characterized in that the fitting has distance elements arranged on the inner circumference of the half-shells for concentric arrangement of the fitting with respect to a primary pipeline.
Claims
1. A fitting for connecting a secondary plastic pipeline of a double pipe system containing two half-shells composed of plastic, comprising wherein in each case each of the half-shells has an integrated heating wire, wherein the heating wire is arranged in each case in the regions of the connecting pieces and the heating wire has several meandering windings, wherein the heating wire is arranged in each case in a groove provided for this in the half-shell and the connecting elements which connect the two half-shells, characterized in that the fitting has distance elements arranged on the inner circumference of the half-shells for concentric arrangement of the fitting with respect to a primary pipeline.
2. The fitting according to claim 1, wherein the distance elements are formed as circular segment-like discs which bear against the outer diameter of a primary pipeline.
3. The fitting according to claim 1, wherein the heating wire runs along the edge of the half-shells.
4. The fitting according to claim 1, wherein the heating wire windings arranged in the region of the connecting pieces are connected to one another via the heating wire running along the edge.
5. The fitting according to claim 1, wherein the half-shells have a welding display.
6. The fitting claim 1, wherein the connecting elements are formed as separate snap connections or snap connections arranged integrally on the fitting.
7. The fitting according to claim 1, wherein the snap connection is formed from a fixing piece which can be inserted into the half-shell or arranged integrally thereon and a clip which can be inserted into the half-shell or arranged integrally thereon.
8. The fitting according to claim 1, wherein the fitting is formed as a T-piece, elbow or curved section.
9. The fitting according to claim 1, wherein the half-shells are formed symmetrically or point-symmetrically.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] An exemplary embodiment of the invention is described on the basis of the figures, wherein the invention is not only restricted to the exemplary embodiment. In the figures:
[0018] FIG. 1 shows a three-dimensional view of a fitting according to the invention of a secondary plastic pipeline,
[0019] FIG. 2 shows a three-dimensional view of a half-shell of a fitting according to the invention with inserted connecting elements,
[0020] FIG. 3 shows a three-dimensional view of a half-shell of a fitting according to the invention;
[0021] FIG. 4 shows a three-dimensional view of the connecting elements and
[0022] FIG. 5 shows a three-dimensional view of a half-shell with an installed primary pipeline.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0023] The drawing represented in FIG. 1 shows a three-dimensional view of a fitting 1 according to the invention. The fitting 1 serves to connect a secondary pipeline 11 of a double pipe system and surrounds the fittings 20 of the primary pipeline 10, such as also pipes or portions of the pipes of the primary pipeline, which is apparent from FIG. 5, wherein one half-shell 2 of the fitting 1 was hidden for an improved view. In the figures, exclusively elbows are formed as fitting 1, of course, this fitting 1 according to the invention also encompasses T-pieces and curved sections which connect the secondary pipeline 11. The fitting 1 contains two preferably symmetrical or point-symmetrical half-shells 2 composed of plastic. The two half-shells 2 bear against one another in the separating plane 19 which runs along the central axis or longitudinal axis 12 so that their edges 17 contact and form a closed fitting 1. The half-shells 2 have an integrated heating wire 3, wherein the heating wire 3 is arranged in each case in the regions of the connecting pieces 4 and runs as a meandering winding 5. The windings 5 extend on the inner diameter 8 of the half-shell 2 in the regions of the connecting pieces 4. In this region, the fitting 1 is welded to the pipe of the secondary pipeline 11. The heating wire 3 runs in the grooves 6 provided for this purpose, wherein the heating wire 3 is preferably ploughed in. The two half-shells 2 are connected to one another via connecting elements 7, wherein the connecting elements 7 are formed here as separate parts, which are apparent in FIG. 4. Wherein a moulded-on embodiment of the snap connections is also conceivable. It is advantageous if the connecting elements 7 are formed as snap connections which are inserted in the through-openings 13 which are arranged at the margin of the edges 17 of the half-shells 2. The clips 14 are preferably, as shown in FIG. 2, arranged on one side of the half-shell 2 and, on the other side of the half-shell 2, the fixing pieces 15 and in the opposite half-shell 2 correspondingly symmetrically opposite, so that the clips 14 and fixing pieces 15 latch in one another. As is clearly apparent in FIGS. 2 and 3, the half-shells 2 have on their inner diameter 8 in the central region 18 distance elements 9 which bear against the fitting of the primary pipeline 10. It is thus enabled that the half-shells 2 in the region of the connecting pieces 4 have an inner diameter which matches the secondary pipe and in the central region 18 the fitting of the primary pipeline 10 is arranged in a positive locking manner and centrally in the fitting 1. The inner diameter 8 in the region of the connecting pieces 4 is welded directly to the pipe of the secondary pipeline and the fitting of the primary pipeline 10 is encompassed in a positive locking manner by the two half-shells 2 of the fitting 1 according to the invention. The distance elements 9 are preferably formed as circular segment-like discs which are arranged in one part on the inner diameter of the half-shell 2. The half-shells 2 in the mounted state then bear against the fittings of the primary pipeline and are welded at the connecting pieces to the pipes of the secondary pipeline 11.
[0024] It is furthermore clearly apparent in FIGS. 2 and 3 that the heating wire 3 extends along the edge 17 and connects the windings 5 to one another at the connecting pieces 4. It is furthermore advantageous if a welding display 16 is arranged on the half-shells 2 in order to identify whether the welding has already been carried out or not. FIG. 5 shows a cut-out from a double pipe system in the case of which a half-shell 2 was hidden in order to represent how the primary pipeline 10 or fitting is arranged therein. It is clearly apparent that the half-shell 2 according to the invention is not only welded to the other half-shell (hidden here), but rather also to the pipe of the primary pipeline and the fitting of the secondary pipeline 11 is arranged in a positive locking and centred manner in the fitting 1 according to the invention.
