BG63132B1 - Closing pipe saddle for a pipeline, made of thermically weldable material - Google Patents

Abstract

The saddle is designed for the connection of pipe or valve fittings supplied with holes which are fitted to pipelines by welding. It is used basically for additional connection of a branching to an already fitted water pipe subjected to the pressure of the medium, as well as for the repair of a faulty water pipeline. Its design is improved and ensures high density of the medium in the places for welding at reduced costs for workmanship and energy for heating. The saddle consists of at least two segments (11, 12) engaging the water pipeline (10), and at least one of the segments (11, 12) has an outlet pipe. Each of the segments (11, 12) has a boundary edge (16, 17) fitted on a boundary flange (18, 19). Segments (11, 12) have boundary edges (16) 17) turned to each other and can be fixed by pressing using projecting out wedge-shaped projections machined at one of the segments (11, 12) and fitted in wedge-shaped inserts formed between the inner surface of the other segment and the outer surface of the pipeline (10). Braided heating wires of stepping-like configuration are designed, made of a wound electric conductor which are solidly built in its concave inner surface (14) The wedge-like bent projections in the form of plates (30, 36) and the wedge-like inserts machined from a seat (40, 46) to each of the two segments (11) are arranged in an alternating manner, supplementing each other with their respective adjacent parts machined to the adjacent segment (11, 12) modelling gear meshing of projecting plates (30, 36) and of seats (40, 46) lying between them. 13 claims, 14 figures

Description

The invention relates to a weldable clamp for a pipeline made of thermally weldable material which finds application for connecting openings or valve fittings, which are to be secured to pipelines by welding. The brackets of this type are mainly used to further attach a branch to an already installed and pressurized water pipe. For this purpose, clamps formed by cylindrical segments having at least one tubular outlet, made in the form of an outlet tube, are attached to one cylindrical shaped segment enclosing the pipeline. This outlet pipe serves, on the one hand, for drilling the pipeline and, on the other, for bringing the medium to the branch connected to it.

Another use of the brackets of this kind is to use them to repair a defective pipeline, whereby a bracket made of cylindrical segments without a pipe outlet is laid around the defect site.

BACKGROUND OF THE INVENTION

It is known from DE 29512309 W for a pipe clamp made of a thermally weldable material consisting of at least two segments enclosing the pipeline using the clamp, with at least one segment having an outlet pipe. In this case, one of the two segments is double-edged, with its two arms extending continuously along the entire axial length of the clamp. The segments have boundary edges along their boundary contact surfaces. Each of the segments has at least one boundary flange, with the use of the bracket the segments are facing each other boundary edges and can be fixed by pressing wedge-shaped projections projecting from the border edges, which are facing in the direction of each other. of the other segment and serve to attach the serving boundary edges to each other.

Those shaped to one segment, curved wedge-shaped projections, are arranged in wedge-shaped inserts formed between the inner surface of the other segment and the outer surface of the pipeline. In order to maintain sufficient density of the medium at the welding location, two layers of heating braids are provided here, consisting of a coiled, electrically conductive conductor. The first layer of the heating braid is disposed on the inner surfaces of the wedge-shaped projections, and the second layer of the heating braid is firmly embedded in the cavity-shaped inner surface forming the adjacent segment.

The disadvantage of this solution is that due to the two layers of heating braids envisaged in it, its implementation requires considerable construction costs and more energy for heating.

Known by DE 3720577A1, a clamp is made in the form of a sleeve for connecting two pipes. The sleeve tightens between the surrounding surfaces of the two tubes as a result of the metal shrinking as it passes from liquid to solid. This is done by placing a ribbon heating braid in the dividing section between the surrounding surface of the tube on one side and the sleeve on the other. The sleeve is mounted with the possibility of displacement and because the ends of the strip-shaped heating braid are disposed relative to each other and are arranged stepwise, using the bracket, these ends are gripped combably into each other.

In this solution, the heating braid is a separate structural element that is applied in a ring like a free strip around the surrounding surface of the pipe and thus a double weld is made, once connecting with the surrounding surface of the pipe and secondly with the inner surface of the sleeve.

SUMMARY OF THE INVENTION

It is an object of the invention to provide a weldable clamp for a pipeline made of a thermally weldable material that is of advanced design and achieves high environmental density at welding locations, with reduced clamp fabrication costs and reduced heating energy.

The object of the invention is solved by a weldable clamp for a conduit made of thermally weldable material comprising at least two segments enclosing the conduit using the clamp. At least one segment has a tube outlet shaped as an outlet tube.

Each of the segments has a boundary edge located on the boundary flange. When using the bracket, the segments are facing each other with boundary edges and can be secured by pressing wedge-shaped convex projections protruding from the border edges, formed to one segment and arranged in wedge-shaped inserts formed between the inner surface of the other segment and the outer surface of the other. the pipeline.

Heating braids are provided, consisting of a coiled, electrically heated conductor, which are firmly embedded in the recessed inner surface formed to each of the segments.

The contribution of the invention to the current state of the art is due to the fact that the wedge-shaped curved projections, made in the form of plates and wedge-shaped inserts formed by sockets and arcuate recesses, are formed in each of the two segments, arranged alternately, complement each other with their respective adjacent formed to the adjacent segment, so that they form a tooth engagement formed by protruding from the border edge and wide plates on the one hand and on the other by nests and arcuate between them remove recesses formed below the level of the border edge and intended to accommodate the slats and wide slats respectively using the bracket.

The heating braids are of a stepped configuration corresponding to the tooth engagement and with a contour profile formed by protruding edges shaped like ears, which are located in the area of the strips, respectively the wide strips of the segment and the gaps lying between them, located in the zone. of the nests, respectively the arcuate recesses.

According to a preferred embodiment of the weldable clamp for a pipeline made of thermally weldable material according to the invention, the gear engagement performed at the boundary edges of the segment divides the heating braid into three differently profiled axial sections, respectively, two end and one or more intermediate sections.

The two end sections, using the clamp, form annular, closed heating cuffs and enclose the conduit in a location where the wound conduit of the heating cuff is located partially annularly from the base of the socket, respectively, to the ends of the strips formed at the edge edge of one edge of the edge edge of one end edge. the bars, respectively, of the base of the sockets, made at the opposite border edge of the other segment.

The intermediate portions in the zone of the boundary edge of one segment form a heating strip whose first half is at least partially extended in the extended wide bar, where the wound conductor passes between the two end portions, limiting one end inner surface from the recessed inner, which remains without a conductor.

According to another embodiment, the weldable clamp for a pipeline made of thermally weldable material according to the invention is formed so that the wedge-shaped curves, respectively, wide strips formed to the boundary edge of the segment, have a thickness of their arcuate cross-section, which is greater than one transverse thickness of the softened area obtained by heating an electrical conductor embedded in the plate, respectively the wide plate.

The weldable clamp for a pipeline made of thermally weldable material according to the invention is well designed in such a way that the electrical conductor is mounted at a free axial distance from the side surfaces of the plates, respectively the wider plate, which is larger from the transverse thickness of the softened area.

The weldable pipe clamp bracket made of thermally weldable material according to the invention is configured so that the heating braid of each segment having a contoured contour profile, drawn by a contour line, is made of windings of a single, contour contour. braid electrical conductor.

In this case, the well-welded pipe clamp clamp made of thermally weldable material according to the invention is designed so that the electrical conductors of the heating braids of the two segments are connected in series with each other and connected to a welding machine.

In yet another embodiment of a weldable clamp for a pipeline made of thermally weldable material according to the invention, the windings of the electrical conductor consist of parallel sections and curved portions between them. The parallel sections in the area of the two end sections, forming the closed heating cuffs of the heating braid, pass in a direction following the circumference of the cylinder.

In the area of the intermediate section of the heating braid, the parallel sections forming the heating strip pass in the direction along the axis of the cylindrical surface of the segment.

The curved parts are located along the contour lines of the ears, respectively, the gaps of the heating braid.

The weldable clamp for a pipeline made of thermally weldable material according to the invention is preferably also made such that the electric conductor is in the form of a meander obtained by passing the wire of the electrical conductor along a wavy line into a matrix. The wire, shaped like a meander, is housed in the coils of a combined heating branch that form the heating braid.

In this embodiment of the weldable clamp for a pipeline made of thermally weldable material according to the invention, the meander-shaped wire has two end straight sections which extend beyond the heating branch and are intended to be connected to an electrical socket mounted on the segment.

The weldable pipe clamp bracket made of thermally weldable material according to the invention is advantageous in having a rectangular stepped profile of the contour of the heating braid defined by the contour lines.

A weldable clamp for a pipeline made of thermally weldable material according to the invention is preferably configured in such a way that the segments have at least one radial boundary flange along their two, axially parallel boundary edges and, through their boundary flanges, the adjacent segments engage one to another with fixing means to form a tightly enclosing pipeline, clamp.

The weldable clamp for a pipeline made of thermally weldable material according to the invention is such that the boundary flange of one segment carries on its inner surface a vertically protruding rib, in which it is mounted parallel to the axis of the heating strip segment by the heating braid.

In this case, a longitudinal groove of shape, width and depth corresponding to the shape of the vertically projecting rib, which is placed in the longitudinal groove, is formed on the inner surface of the opposite boundary flange of the adjacent segment.

A weldable clamp for a pipeline made of thermally weldable material according to the invention is designed so that the thickness of the cross-section of the plate, respectively the wide plate, is made so small that it is possible to extend the soft material.

The advantages of a weldable clamp according to the invention are as follows.

On the one hand, good stability of the clamp is maintained with a single-coiled wire. This is due to the fact that the set of dental elements located in the area of the two boundary edges provide mutual tooth engagement between adjacent segments. In fact, complementary notching was carried out along the boundary edges of the two segments. Dental elements, made in the form of strips, respectively wide strips, on the one hand, and nests between them, on the other, form a dentition, which is located on both sides of the border edges. In this way, a labial contour of connecting the plates and the sockets to each other is provided in the area between the boundary surfaces of the twin engagement. The heating braids having a serrated step profile are provided with a single-conductor electrical conductor. Thus, the heating braid of each of the segments is located only in the inner concave surface of the plates, respectively the wide plate, while the area of the sockets remains free of an electrical conductor.

A single-layer conductor, compared to the known two-layer placement of the conductor in the wall of the clamp in the known and cited above solution, requires less energy to heat during the heating process.

On the other hand, the single-layer arrangement of the conductor described above achieves double-sided welding of the strips or the wide strips, respectively, because in the advanced design of the bracket according to the invention, it is recommended that the strips or the wide strips of the two segments be made so thin. that the heating braid not only warms the inner but also the outer surface.

Explanation of the annexed figures

The invention is presented in several variants of the accompanying drawings, of which:

Figure 1 is a cross-sectional and partial section of the two segments of the weldable clamp for repair in position before mounting them in the pipeline;

Figure 2 is a cross-sectional view of the segments of Figure 1 in position after attachment to the pipeline;

Figure 3 is a perspective view of the concave inner surface of the lower segment of Figure 1;

Figure 4 is a perspective view of the lower segment of Figure 3, viewed from the opposite side;

FIG. 5 is a perspective view of the concave inner surface of the upper segment of FIG. 1, respectively; FIG. 2 is a weldable clamp; FIG.

6 is a planar unfolding of the concave inner surface of FIGS. 3 or 5 segments, on which is placed a heating braid, from which can be seen both the special profile of its contour and the course of the turns of the electrical conductor for its fabrication;

7 is a planar unfolding of the two heating braids of the segments of FIG. 3 and 5 after attachment to one another by their boundary edges;

8 and 9 schematically depict two alternative shapes of the contour of the heating braid corresponding to the image of FIG. 7;

FIG. 10 is an alternative embodiment of the weldable clamp according to the invention in the same way as in FIG. 2;

FIG. 11 is a top plan view of a portion of the meander electrically conductor-shaped wire having two-sided drawn wire sections provided for connection purposes; FIG.

12 is a top plan view of a large magnification of a two-component heating branch in which the electrical conductor of FIG. 11 and which may also be used in other welded fittings, such as welding sleeves;

13 is a cross-sectional view through the heating branch of FIG. 12 along the line X 1 -X ²²² ;

Fig. 14 is a longitudinal sectional view of an enlarged but compared to Fig. 12 and 13 show a reduced image through the wall of a molding molded segment of the segment of FIG. 3 to FIG. 5.

Examples of carrying out the invention

The welding clamp shown in Figures 1 and 2, in particular the repair bracket, consists of two cylindrical segments and 12 which, when used for assembly around pipeline 10, are fixed by welding at the desired locations. Cylindrical segments 11,12 are hereinafter referred to as "segments".

Pipeline 10 and both segments 11 are made of heat-weldable material. The two segments 11, 12 as shown in FIG. 3 and 5, in fact, the levers are of the same shape and have the same concave inner surface 14, but differ in that the upper segment 12 is provided with an outlet pipe 13. The outlet pipe 13 has a through hole 15 to its concave inner 5 surface 14, which is part of a cylinder, as shown in FIG. 1 and 5. Since the two segments 11 and 12 are of the same construction, it is sufficient to examine one of them and in this case to consider the lower segment 11.

Each of the two segments 11,12 has two boundary edges, respectively, 16, 17, which are formed on radially arranged boundary flanges 18, 19 provided for fixing purposes. Fastening means consisting of bolts 58 shown in FIG. 2, passing through molded flanges 18, 19, openings 57 shown in FIG. 3, to which bolts 58 are screwed nuts 59. In the recessed inner surfaces 14 of the two segments 11, 12, a heating braid 20 is embedded, which is best shown in FIG. 6. In the present case, the heating braid 20 is uniformly profiled in the two segments 11, 12, which is why it is sufficient to consider the plane unfolding of only one segment 11, 12, in particular the upper segment 12, illustrated in FIG. 5.

From the plane unfolding of FIG. 6 shows the outline of the upper segment 12, indicated by a dashed line. The two boundary edges 16, 17 of segment 12 are outlined. The heating braid 20 has a different contour of its profile along the boundary edges 16, 17, which are outlined with contour lines 26, 27 in FIG. 6 by dotted line. These contour lines 26, 27 are further formed in this case. The contour of the profile of the heating braid 20 has narrow ear-shaped edges 24 and an intermediate portion shaped like a wide ear 28, in the region of which the contour lines exceed the boundary edges 16, 17, with a narrow 25 formed between the narrow 24 and the wide 28 ear. and a wide 29 gaps, the contour lines of which are located below the two boundary edges 16, 17. This dismembered, stepped contour of the profile of the heating braid 20 is interwoven as shown in FIG. 5 shows a semi-cylindrical recessed inner surface 14 of the upper segment 12 such that, by means of a cross-section made along the cutting line ² - ² of FIG. 5, in the area of the wide ear 28, the heating braid 20 and the partial cylindricality of the concave inner surface 14 will be seen beyond which the corresponding boundary edges 17 extend out there. This characteristic change in the shape of the heating braid 20 is naturally reinforced, respectively, by the material of the lower segment 11, respectively the upper segment 12, in the area of the gaps 25, 29, which are filled by narrow strips 30 and a wide plate 36 with a rear wall 34, curved with respect to the concave inner surface 14 of the upper segment 12, and therefore the narrow strips 30 and the wide strip 36 are made to extend beyond their respective boundary edge 17. The wide strip 36, respectively, the narrow strips 30, are formed as a single piece with corresponding their upper segment 12 and have an arcuate cross section 33, which is outlined by the shading in FIG. 1. This arcuate cross-section 33 is formed not only by the extension of the cylindrical concave inner surface 14, but also by the rear wall 34 of the wide bar 36, respectively, the narrow bars 30, which extend into convex curves as compared to the concave inner surface 14. In this way, a thin cross-section is obtained at the free end, in the area of one front section 31 of the narrow strips 30, respectively, the wide strip 36, which is wedge-shaped. In the area of one step 32 of the wide bar 36, respectively, the narrow bars 30 have a greater thickness of the cross section 35 than the front portion 31, where the tip of the wedge is located.

In the narrow gap region 25 of the lower segment 11, the opposite ratio follows. These gaps 25 are used specifically to form, through suitable grooves, in the recessed inner surface 14 of the lower segment 11 of the socket 40, having the shape of the strips 30, 36, light width 41, complementary to that described above with positions 31-34, depth 42 and corresponding bending curvature 43. This is clarified from that shown in FIG. 1 through a recess 46 having the shape of the sockets 40 described above with positions 41-43. Such recess 46 is also shown in FIGS. 4 sockets 40, but in two of them it starts at the clarification in FIG. 6 is a wide gap 26 of the heating braid 20. FIG. 6, the size and position of the recesses 46 and, in the present case, of the five sockets 40 are indicated by dot hatching along the boundary edges 16, 17 of segment 11, 12.

The one shown in FIG. 6, the contour profile of the heating braid 20 of segment 11, 12 can be divided into three sections 21, 22 and 23 respectively, which are profiled differently along the two contour lines 26, 27. In two end sections 37, 38 of segment 11 12, there are two sections 21, 22, in particular "heating cuffs", as these sections 21, 22 in the case of use as shown in FIG. 7, a flat unfolding of the two heating braids 20, after securing the segments 11, 12 to each other, form a closed cuff 21, 22 when connecting the clamp to the pipeline 10, which is shown in FIG. 2. As shown in FIG. 7, the two segments 11, 12 are in contact through their boundary edges 16, 17. In this situation, the narrow ears 24 of the lower segment 11 fill the narrow gaps 25 of the upper segment 12, which is also true in the reverse order and ears 24 of segment 12 and the gaps 25 of segment 11.

Between each other, two boundary edges 16, 17 of the two segments 11, 12 are shown in FIG. 7 welding joint 39. The two contour lines 26, 27 of this figure are also indicated by dashes. The contour lines 26, 27 have a stepped profile that repeatedly intersects the contact welding joint 39 between the two segments 11, 12. This produces a kind of "gear engagement" between the non-recessed sections 21 forming the heating sleeves of the two segments 11, 12. An annular closed shape is obtained when the flat portions of the two heating braids 20 are pre-cylindrical in accordance with the two concave inner surfaces 14 of the segment 11, 12, where the heating braid is mounted 20. Thus, the two dotted in FIG. 7 border edges 16, 17 of the two segments 11, 12 are in contact with each other.

As already clarified from what is shown in FIG. 6, the position of the ears 24, 28 and the interfaces 25, 29 in the section of the heating cuff 21 with respect to the two contour lines 26, 27 are complementary. The ears 24 and the gaps 25 are always in pairs in front of each other. A similar construction is also found opposite to the end portion 38 of FIG. 3 with the heating cuff 22. However, with the heating cuff 22, the ears 24 and the gaps 25, compared to the heating cuff 21, are interchanged. As shown in FIG. 6, the shape of the heating sleeve 22 is obtained as a double mirror, about two perpendicular central axes of profile corresponding to the profile of the heating sleeve 21. The mathematical expression for this determines that the heating sleeve 22 has a centrally symmetrical profile with respect to the heating sleeve 21. can be seen from FIG. 3 and 4, this symmetrical shape is also valid with respect to the spaced bends 24 in the section of the ears 24 and to the slots 40 provided at the gaps 25.

The aforementioned third section of the heating braid 20 represents the heating strip 23 shown in FIG. 6, which extends parallel to the axis of the heating braid 20 and is disposed between the two heating cuffs 21, 22. This heating strip 23 is supported on one side in the narrow ear 24 and thus can be joined therewith, as is shown in FIG. 6 and thus forming the wide ear 28. According to FIG. 6, one half 44 of the heating strip 23 is located above the boundary edge 17 of the segment 11 and therefore together with the adjacent narrow ear 24 of the second heating cuff 22 is embedded in the concave inner surface of the wide bar 36. This is shown in FIG. 3. The other half 45 of the heating strip 23 is located below the boundary edge 17, along the concave inner surface 14 of the segment 11, respectively, 12. As can best be understood from FIG. 6, the heating strip 23 lies symmetrically on the outside, so that a substantially sizeable, residual end inner surface 47 of the segment 11, 12 is free of the heating braid 20 and forms a space free of the heating braid 20. In this space is located the through hole 15 of the outlet pipe 13, as indicated in FIG. 6. As can be seen from FIG. 2, the outlet pipe 13 has a diameter of the opening 48 which is equal to the inner diameter 49 of the pipeline 10. If necessary, a wedge-shaped insert is provided, which is located externally at the through hole 15 in the residual end inner surface 47 of the segment 12 and is filled with coils of the above-described electrical conductor, thereby facilitating the formation of the heating braid 20.

In order to save heating energy, a relatively narrow heating strip 23 is made, in which, as understood from the illustrations in FIG. In the 7th embodiment, the two halves 44, 45 are located on both sides of the contact welding joint, thus providing a very effective and tight welding joint in the middle. This can be seen particularly well from FIG. 2, where the two segments 11, 12 of one finished bracket are assembled to pipeline 10. From FIG. 2 clearly understands how the heated strip 23 of the curved wide plate 36 is secured in an additional arcuate recess 46. In the contact areas of the wide bar 36 and the additional arcuate recess, a wall of the clamp is formed, which is constructed from the two segments 11, 12 through their suitable for welding material. In this way, the most important portion of the concave inner surface 14 of the clamp is provided with a heating braid 20, as shown in FIG. 2 with the marked heating strip 23. In the region of the end sections 37, 38 of the segment 11, respectively of the segment 12, there are located heating cuffs 21, 22, even if the parts of the heating braid 20 described above are completely planar above the recessed inner surface 14 of the clamp.

Using the fastening means, respectively bolts 58, inserted into the openings 57 and tightened with nuts 59, the two segments 11, 12 are pressed on their boundary flanges 18, 19 as shown in FIG. 2. On the lower surface of the boundary flange 19 of the upper segment 12, a stop 55 is provided to determine the outer size of the connection by pressing the two segments 11, 12. Thus, by means of the additional arcuate recess 46, the wide plate 36 is pressed over the surrounding surface 54 pipeline 10. This is naturally also true for the same shape plates 30 and sockets 40. Thus, in these places, a better radial clamping of the already mounted clamp formed by segments 11, 12 mounted to the surrounding surface 54 of the pipeline is obtained. yes 10. When the wire of the heating braid 20 is heated, the weldable material is melted in the contact areas between the concave inner surface 14 of the clamp formed by segments 11, 12 and the convex surrounding surface 54 of the conduit 10. A softened zone is formed. material 50 as seen in FIG. 2 and is indicated by spot hatching.

The displaced material 50 may extend outward through the contact welding joint 39 due to the acting pressure between the two segments 11, 12 of the clamp. In some cases, this is even desirable since, in this way, the leakage of the softened material 50 outwards at a particular location is an indication of good welding performance. In other cases, however, this is not desirable and in order to avoid it, the bracket of the invention can be slightly complicated. This requires the thickness 35 of the arcuate cross section 33 of the wide bar 36 shown in FIG. 1, respectively, the transverse thickness of the plate 30 to be slightly larger than the transverse thickness 51 of the soft material zone 50 located in the wedge portion of the wide plate 36, respectively, of the plate 30.

Figures 8 and 9 show, in schematic view, alternate ratios of the contour profile of the heating braid 20 disposed on the two, indicated in the dotted line figures, segment 11, 12, which in reality is comparable to that of FIG. 7. The location of the two heating braids 20 ' and 20 " located on the two segments 11, 12 is indicated in FIG. 8 and 9 with opposite shading and showing the extremely complementary lines of the contour profile defined by the contour lines 26 ', 27', respectively 26 ', 27', arranged bilaterally at the boundary edges 16 ', 17', respectively 16 ”, 17”. In FIG. 8, instead of the rectangular profile described above, a trapezoidal or tooth profile 26 ', 27 * was used on the stepped surface of the contour.

In FIG. 9 shows a contour profile 26, 27 ”in wavy shape. These complementary contour profiles of the two segments 11, 12 with the shapes described above allow, through a suitable stroke of the heating braid winding 20, a branch containing an electrical conductor, which will subsequently be described in more detail.

As mentioned above and understood in FIG. 1, the outlet pipe 13 has one through-hole 14 in the recessed inner surface 14 of the through-hole segment 15. After heating the integral braid 11, 12, the heating braid 20 and cooling the melt of the material, the joint may be tested pressure to determine if the weld is defective. For this purpose, it is only necessary to place a pressure sensor and pressure generating apparatus on the outlet pipe 13. In this case, the conduit 10 at the place of attachment of the clamp formed by the segments 11, 12 is under some arbitrary pressure in the surrounding medium. If the pressure test is initially not satisfactorily carried out, then the conduit 10 is drilled, which can be carried out through the outlet pipe 13 or through a similar tube outlet to the opposite segment 11. Subsequently, as shown in FIG. 2, a drilled hole 77 is penetrated inside the outlet pipe 13, drilled into the conduit 10, through which the medium contained therein flows through the outlet duct 13.

Figure 10 shows a cross-sectional view similar to that shown in FIG. 2, referring to an alternative embodiment of segment 1G receiving a heating strip 23 'of a heating braid 20, similar to that shown in FIG. 6. Shown in FIG. 10 segments 1G, 12 ', one of which also carries an outlet pipe 13', are provided with a vertically projecting rib 52 extending along the inner surface of a belt 68 of the boundary flange 18 ', which is engaged in a longitudinal channel 53 formed on the opposite the disposed inner surface of belt 69 of boundary flange 19 ', which longitudinal groove 53 in terms of shape and size corresponds to the configuration of the vertically projecting rib 52. In the middle region of the heating braid 20, where the heating bar 23' is located, is provided for such that a contact welding joint which is located between the flanges 18 ', 19' and welds tightly. Also provided in this embodiment, the heating cuffs 21, 22, located in the end portions of segments 1G, 12 ', are also interconnected plates 30 and sockets 40. The heating cuffs 21, 22 provide welding zones that completely connect the surrounding surface 54 of the pipeline 10.

The conductor used in the heating braid 61 has a special shape and represents only one component of the seals according to FIG. 11-14, combined heating clone 60. The conductor is filled with a meander shape 63, which is achieved by forming the wire of the conductor 61 through a matrix made of two interlocking gears whose tooth shape forms curves of the meander 63. The extreme straight sections 64 of the conductor 61 are obtained as a result of the fact that during the automatic feeding of the conductor 61, before they are driven from the gear wheels mentioned above, they are separated so far as to pass the wire 61 when their teeth are not engaged. The shape of meander 63 is a straight-line wavy line. The drawn end straight sections 64 of conductor 61 shown in FIG. 11, are used to connect it to electrical contacts, which are always mounted on segments 11, 12. These contacts are used for connection to a welding machine. The contacts at one end of the respective heating braid 20 are connected to one another by a cable, the two heating braids 20 of the segments 11, 12 being heated simultaneously and this results in a uniform welding on all surfaces of the finished clamp.

As can be seen in FIG. 12, the meander shape 63, which is greatly enlarged here, is embedded in a flat strip 62 made of a heat-weldable material to form the two components of one heating clone 60. The flat strip 62 has, as shown in FIG. . 13, a rectangular cross-section of width 65, made substantially larger than the width 67 of the meander 63 shown in FIG. 11. The thickness 66 of the strip 62 is also selected substantially larger than the diameter 71 of the conductor 61 shown in FIG. 13.

FIG. 14 shows a longitudinal section through the wall of die injection molding matrix 76 in which segments 11, 12 are formed. In order to be able to form a concave inner surface 14 of segment 11, 12, the die 76 is configured with a convex inner surface. corresponding to the opening 77, with grooves 70 formed thereon, into which the combined heating clone 60 is inserted by pressure before injection / ia of the material. Separation barriers 72 are provided between the channels 70, which are in contact with their adjacent already positioned as shown in FIG. 14, the coils 73 of the combined heating clone 60. The coils 73 of positions in the shape of the inner surface of the combined heating clone 60 are fixed in the grooves 70. By feeding material to form the segment 11, 12 in the die 76, the combined heating clone 60 is incorporated into of the received segment 11, respectively 12.

A possible shape of the coils 73 of the heating clone 60 is shown in FIG. 6. As can be seen from the figure, the coils 73 comprise parallel portions 74 and curved portions 75 between them. The windings 73 of the heating clone 60 located in the area of the heating cuffs 21, 22 are positioned opposite to the coils lying between them. 73 of the heating clone 60 located in the area of the heating strip 23. In FIG. 5 shows a combined heating clone 60 in a simplified image due to the fact that they are outlined only with a circular profile and only the parallel sections 74 of the bends 73 are shown. It should be taken into account that visible in FIG. 5, the ends of the parallel sections 74 are connected to the curved parts 75 as shown in FIG. 6. As will be understood from FIG. 5 and 6, the parallel sections 74 of the combined heating clone 60 extend into the area of the heating cuffs 21, 22 in the direction defined by the circumference of the cylinder, while in the section of the heating strip 23, said parallel arms are oriented in a direction parallel to the axis of the cylinder. the semi-cylindrical surface of segment 11, respectively, 12. The curved portions 75, as shown in FIG. 6 are arranged along contour lines 26, 27, outlining the contour profiles of the heating braid 20.

Such an arrangement of the electrical conductor 61 in the combined heating branch 61 in the form of planarly spaced, adjacent turns 73 is particularly effective for the welding process. The use of such a combined heating clone 60 is therefore not limited to use only on the segments 11, 12 of the clamping bracket described. Another welding fixture could also be fitted with an electrical conductor as described, for example, these may be so-called. welding sleeves that can be connected to one another by pipes facing each other.

Another possibility for the application of the combined heating clones 60 described above is their placement in saddle surfaces of openings fitted with openings or valve fittings, which must be secured to pipelines 10 in a similar manner by welding.

The production and use of the combined heating clone 60 according to the invention is also given particular importance.

Claims (13)

Claims 1. A weldable clamp for a pipeline made of thermally weldable material comprising at least two segments (11, 12) comprising the pipeline (10) using the clamp, of which at least one segment (11, 12) has an outlet pipe ( 13), with each of the segments (11, 12) having a boundary edge (16, 17) disposed on a boundary flange (18, 19), and using the clamp the segments (11, 12) facing one another edges (16, 17) and can be fixed by clamping, wedge-shaped projections projecting from the boundary edges (16, 17), us to one segment (11, 12) and arranged in wedge-shaped inserts formed between the inner surface of the other segment (11, 12) and the outer surface of the conduit (10), providing heating braids (20) composed of a coiled, electrically heated conductor (61), which are rigidly embedded in the recessed inner surface (14) formed into each of the segments (11, 12), characterized in that the wedge-shaped curved projections are in the form of bars (30, 36) and wedge-shaped inserts formed by sockets (40) and arcuate the recesses (46) are formed to each of the two segments (11, 12), arranged alternately, complementary to each other adjacent, formed to the adjacent segment (11, 12), so as to form a tooth engagement formed by protruding edges (16, 17) (30) and wide edges (36), on the one hand, and on the other, by nests (40) and arched recesses (46) formed below the border edge level (16, 17) and intended to receive the plates (30) and wide plates (36) respectively using the bracket, such as heating braids each (20) having a stepped configuration corresponding to the tooth engagement and with a contour profile formed by protruding edges shaped like ears (24, 26), which are located in the area of the plates (30), respectively, the wide plates (36) of the segment (11, 12) and of the gaps (25, 29) lying between them, located in the area of the sockets (30), respectively, the arched recesses (46). 2. A weldable clamp for a pipeline made of thermally weldable material according to claim 1, characterized in that the tooth engagement carried out along the boundary edges (16, 17) of the segment (11, 12) divides the heating braid (20) into three, differently profiled axial sections (21, 22, 28), respectively, two end sections forming annular, closed heating cuffs (21, 22) and enclosing the conduit (10) at the location where the wound conductor (61) the heating sleeve (20) is partially disposed ring-shaped from the base of the socket (40), respectively, to the end of the plates (30) formed at the border edge (16) of one of the segments (11) to the end of the plates (30), respectively, to the base of the sockets (40), made at the opposite a boundary edge (17) of the other segment (12), and one or more displaced intermediate regions (28) forming in the zone of the boundary edge (17) of one segment (12) a heating strip (23) whose first half (44) ) is at least partially extended in the extended wide bar (36), where the wound conductor (61) crosses between the two end sections a (21, 22) by restricting one end inner surface (47) of the concave inner surface (14) of the segment (11, 12) that remains without a conductor (61). 3. Weldable pipe clamp bracket made of thermally weldable material according to claim 1 or 2, characterized in that the wedge-shaped curves (30), respectively, wide strips (36), are formed to the boundary edge (16, 17) of the segment (11, 12) have a thickness (35) of their arcuate cross section (33) which is greater than one transverse thickness (51) of the soft material zone (50) obtained by heating an electrical conductor (61) ) built into the bar (30), respectively the wide bar (36). 4. Weldable clamp for a pipeline made of thermally weldable material according to claims 1 to 3, characterized in that the electrical conductor (61) is mounted at an axially free axial distance from the side surfaces of the plates (30), respectively, the wide bar (36), which is larger than the transverse thickness (51) of the softened area (50). 5. A weldable pipe clamp made of thermally weldable material according to any one of claims 1 to 4, characterized in that the heating braid (20) of each segment (11, 12) has a broken loop profile outlined by a contour line (26, 27) is made of windings (73) of a single, circumferential contour of the braid an electrical conductor (61). 6. A weldable pipe clamp made of thermally weldable material according to claim 5, characterized in that the electrical conductors (61) of the heating braids (20) of the two segments (11,12) are connected in series with each other and are connected to a welding machine. A weldable pipe clamp made of thermally weldable material according to any one of claims 1 to 6, characterized in that the windings (73) of the electrical conductor (61) consist of parallel sections (74) and the bent parts (75) lying between them, with the parallel sections (74) in the area of the two final 5 sections forming the closed heating cuffs (21, 22) of the heating braid (20), passing in the direction of the circumference of the cylinder, and in the zone of the intermediate section (28) of the heating braid (20) of the parallel portion qi (74) forming the heating strip (23) extend in the direction along the axis of the cylindrical surface of the segment (11, 12), wherein the curved parts (75) are arranged along contour lines (26, 27) of the ears (24, 28), respectively, the gaps (25, 29) of the heating braid (20). 8. Welding clamp for a pipeline made of thermally weldable material according to any one of claims 1 to 7, characterized in that the electrical conductor (61) is in the form of a meander (63) obtained by passing the wire of the electrical conductor (61) along a wavy line in a matrix, the wire shaped like a meander (63) being housed in coils (73) of a combined heating clone (60) forming the heating braid (20). 9. Welding clamp for a pipeline made of thermally weldable material according to claim 7, characterized in that the meander-shaped wire (63) has two end straight sections (64) extending beyond the heating branch (60). and are provided for connection to an electrical outlet mounted on the segment (11, 12). A weldable pipe clamp made of thermally weldable material according to any one of claims 1 to 9, characterized in that the contour profile of the heating braid (20) is defined by the contour lines (26, 27) is rectangular stepped. 11. A weldable pipeline clamp made of thermally weldable material according to any one of claims 1 to 10, characterized in that the segments (11, 12) have at least one radial boundary flange (18, 19) their two axially parallel boundary edges (16, 17) and through their boundary flanges (18, 19) the adjacent segments (11, 12) engage with each other with fixing means (57, 58, 59) to form a tightly enclosing pipeline (10) bracket. A weldable pipe clamp made of thermally weldable material according to any one of claims 1 to 11, characterized in that the boundary flange (18 ') of one segment (1D) is supported on its inner surface (1D). 68) a vertically protruding rib (52) in which a heating strip (23 ') of the heating braid (20) is inserted parallel to the axis of the segment (11, 12) and the opposite flange (19) along the inner surface (69). ') on the adjacent segment (12') is formed a longitudinal channel (53) with a shape, width and depth corresponding to φ rmata of vertically extending ribs (52), which is placed in the longitudinal channel (53). 13. Welding pipe clamp made of thermally weldable material according to any one of claims 1 to 12, characterized in that the thickness of the cross-section of the bar (30) and the wide bar (36) are respectively made small that the softened material (50) is capable of extending outwards.