DD201620A5 - CONNECTING ELEMENT BETWEEN A PLASTIC LINE FOR FLUIDS UNDER PRESSURE AND A METALLIC LINE - Google Patents

Abstract

The invention relates to a connecting element, which avoids the tearing of a plastic line under the action of zufäelliger tensile stresses, whereby the tightness of the pipe joint is secured. This connecting element is formed of a ferrule which is inserted into the plastic conduit and through a collar, a pressure cone surrounding the plastic conduit which abuts its base on the collar, the surfaces of the ferrule and the pressure cone being in contact with the plastic conduit are with Saegezahnprofil, but which are not cut and offset from each other, and by a clamping sleeve, one end of which has a conical bore, and is locked by a housing which is screwed around the clamping sleeve and is supported by an inner approach to the covenant. Two seals ensure the tightness. The application is made with gas collector connections. Fig. 1

Description

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Connecting element between a Piastleitung and 'a metallic line'.

Field of application of the invention

The present. The invention relates to a connecting element which can connect a conduit made of plastic for fluids under pressure and a metallic conduit. This connecting element can be used, for example, in the case of a facade opening for a gas collector.

Characteristic of the known technical solutions

The feeding of a city gas collector has been done for some years via pipes made of plastic, such as high-density polyethylene. The supply of a water absorber is carried out by means of polyvinyl chloride pipes. "

The plastic pipe is thus exposed to the natural or accidental movements of the ground, the road or the sidewalks and even by certain road structures, which are made with the help of carriers, random tensile stresses'ausgesetzt be exposed, the plastic pipe from the connecting element, they with the Metallic, installed at the gas collector line, can tear out *

None of the known today fasteners on a protection against such tearing out of the plastic line. Although a suitable attachment of this line can be ensured during installation, after a certain time it is no longer the same due to the flow of the plastic of the line, and certain tensile stresses which are present at the beginning of the commissioning.

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can be completely permissible, can subsequently cause a sliding of this line in the "connecting element and finally the tearing out of this line.

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Object of the invention

The aim of the invention is to provide a connecting element between a plastic line and a metallic line, whereby the safety of line connections in gas and water connections, in particular for households, is increased *

presentation; the essence of the invention

The invention has the object of providing a connecting element between a Plästleitung and a metallic line for fluids under pressure in such a way that the connecting element secures the connection between the plastic line and metallic line at occurring tensile loads and tight. '

According to the invention the object is achieved in that it comprises the following axisymmetric metal parts:

- A ferrule, which opens into the interior of the end of the Plästleitung and is provided on its outer surface with an annular toothing, which is in contact with the inner wall of said line end and which has a collar which lies on the cut surface of the plastic line in abutment .

a pressure cone with a plurality of sectors separated by compensation gaps, which surrounds the plastic line and has an annular toothing on its inner surface.

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see, which is in contact with the outer wall of the plastic tube, and which has a conical outer surface and a base, γ / moose on said collar abutting,

a collet, one end of which has a cylindrical outer surface and a conical bore which connects to the conical surface of the pressure cone and the second cylindrical end of which has an inner diameter slightly larger than the outer diameter of the plastic conduit; Gears of the pressure cone and the clamping sleeve have a sägeza.hnf örmiges profile whose end faces are turned to the collar of the ferrule,

- A housing, one end of which is fixed to the metallic conduit and which comprises an inner approach, which lies on the collar of .Zwinge in attack.

The connecting element advantageously has a first toric seal which is mounted in an annular case formed in the inner wall of the Eittelpartie of the housing and a second seal which is mounted in an annular, incorporated into the inner wall of the second end of the clamping sleeve groove.

According to another feature of the invention, the conical surfaces of the pressure cone and the clamping sleeve have a conicity of 15 to 20 percent »

It is known to protect the plastic line as it breaks through the facade wall of the gas collector by a steel sleeve, which is embedded in the wall and one end of which protrudes on the side of the customer,

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The Verbinduzigselement invention can be supported by this end of the sleeve and transmits all applied to the gas lines mechanical stresses on this end »

Accordingly, a steel sleeve is advantageously mounted in the wall breakthrough, one end of which is welded to the second Sude the clamping sleeve and the steel sleeve is coated with an insulating layer of polyethylene.

According to the invention have the teeth of the ferrule and the pressure cone blunting.

According to a further feature of the invention, blocking means for the housing are arranged on the clamping sleeve, which are advantageously formed from at least one grub screw extending through the wall of the middle section of the housing and screwed against the clamping sleeve.

The connecting element according to the invention does not have the disadvantage mentioned, the pulling out of the piast line, since every pull applied to the plastic line causes an increased tensioning effect of this element, a tensioning effect which, incidentally, is progressive and proportional to the tensile stress. The connecting element according to the invention has, on the one hand, the advantage of being self-tensioning under the action of the tensile stresses applied to the plastic line and, on the other hand, of possessing a clamping system which is functionally independent of its sealing system,

embodiment

The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawings show:

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1 shows a cross section of the connecting element before clamping with a sectional view of the axis and a part in half section and a part in section over the axis,

Pig, 2: one of the Pig, 1 corresponding view after clamping,

Pig. 3 is a similar view to the previous one of the connecting element after a random pull has been exerted on the plastic line,

Pig. 4: two views of the ferrule, FIG. 5: two views of the pressure cone,

Pig »6: Half sections of the clamping sleeve, Fig. 7: Half sections · of the housing _?

Pig, 8: the sawtooth profile of the ring-shaped toothing of the ferrule,

In Fig. "" 1 is a plastic line 1, which consists for example of polyvinyl chloride or better of high density polyethylene, shown at the output of its opening through a wall 2,

The connecting element according to the invention is formed from various steel parts described below, which are axisymmetric with respect to an axis 3 of the plastic line 1. The metallic line to which the connecting element is fixed by its outer casing 4 is not shown in the drawing, for example, it is attached to the end of the casing 4 on the right side of Pig. 1 screwed on,. '; "

The first part to be used in the assembly of the connecting element is a clamping sleeve 5 around the part of the plastic

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line 1, which arrives at the customer after he has crossed the wall 2nd A steel sleeve β is generally passed in advance around the end of the plastic line 1, to be walled later in the wall 2, after being covered with an insulating layer 7 of polyethylene. In this case, the clamping sleeve 5, which is guided after the steel sleeve 6 around the plastic pipe 1, are attached to the latter, for example by welding. The facing the wall 2 end of the clamping sleeve 5 has a cylindrical inner surface 8, which can slide by gentle friction around the plastic line 1, and provided with two Spannabflachungen 9 and a threaded portion 10 outer surface, the other end of the clamping sleeve 5 is cylindrical and v / has a conical bore 11 inside. Two half sections of the clamping sleeve 5 are shown on Pig, β, where the same markings as on Pig. -1 are to be found,

The second part to be used in the assembly of the connecting element is a pressure cone 12, which partly inserts through its tip into a conical interval 13 of the clamping sleeve 5 and the plastic line 1. This pressure cone 12 actually has a conical outer surface, which connects to the conical bore 11 of the clamping sleeve 5, and a planar base 13 a, of which Pig, 5 are given two views, Ss is a composite of several sectors pressure cone 12 - on By way of example, for example, three sectors are separated by clearance gaps and held by a steel ring 14 located in an outer groove of its base 13a.

The conical surfaces of the pressure cone 12 and the clamping sleeve 5 have a taper of 15 to 20 %.

The inner surface of the pressure cone 12 is provided with an annular

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toothing 15 provided with Sagezah.nprof.il, which is in contact with the outer wall of the plastic line 1 through the tips of their teeth. The edges of the teeth are preferably truncated so that they can not cut the plastic of the plastic line 1. The blunting of the teeth, for example, makes a flattening of 0.3 2221, as with 20 on Pig. 8 indicated.

The third part to be mounted is ¹ a ferrule 16, of which a drawing is given in two views on Pig, 4, this ferrule 16 is a rotary part corresponding to the axis 3, which is inserted inside the end of the plastic line 1, against the cut surface it through his covenant 1? sun stop comes', wherein the collar 17 is also on the flat surface of the base 13a of the pressure cone 12 in abutment. The body of the ferrule 16, which is cylindrical inside, is provided on its outer surface with an annular toothing 18 which is in contact by the tips of its teeth with the inner wall of the pipe end of the plastic pipe 1. The sawtooth profile of this toothing 18 is shown on a larger scale on Pig, 8. It is the same profile as that of the inner surface of the pressure cone 12, end faces 19 of all teeth are both, the pressure cone and the ferrule 16 to the collar 17 is rotated. The teeth 15; 18 are offset from one another, so that the tooth tips or flats 20 are not opposite. The orientation of the sawtooth profile with respect to the plastic line 1 has the goal to connect the end of this plastic line 1 with the interior of the connecting element so that random tensile stresses on the Pla.stleitung 1 is counteracted, since once the connecting element is mounted, its Clamping action allows the teeth to penetrate into the thickness of this plastic element 1 »

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Pig, 8 are the blunting 20 of the teeth of the ferrule 16 on which the teeth of the pressure cone is connected to the 12 identical, the fourth in the assembly to be used part of the connecting elements of s, the housing 4 ₅ surrounds all the previous parts, and at its Wall 2 assigning end 21 includes an internal thread 22, whereby it can be screwed onto the threaded portion 10 of the clamping sleeve 5 by means of a wrench, for example a torque wrench. For this, two flats 23 are arranged a few centimeters apart from the other end of the housing.

When screwing the middle part of the housing 4 slides by gentle friction on the cylindrical outer surface of the clamping sleeve 5. The other end of the housing 4, the wall 2 opposite side, that is the side of the metallic line is provided with an inner projection 24 which when screwing on the collar 17 of the ferrule 16 comes to stop, which causes, as soon as this approach 24 is on the collar 17 in abutment, the. Clamping sleeve 5 against the end of the plastic line 1 protrudes and sink the teeth of the pressure cone 12 and the ferrule 16 in the thickness of this plastic line 1.

Pig, Fig. 7 shows two half-sections of the housing 4, in order to ensure the tightness of the connecting element, that is to prevent the escape of the pressurized gas, which is supplied from the plastic line 1, two tori ache seals 25 and 26 in the annular Grooves, which were incorporated for the first seal 25 in the inner wall of the.-Middle part of the housing 4 and for the second seal 26 in the inner wall of the located on the wall side 2 end of the clamping sleeve 5. It becomes clear that the tightness ssystein is independent of the clamping system.

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The latter is completed by a blocking device, for example, like the Pig. 1, 2, 3 and 7, by means of a Madensc.hrau.be 27, preferably a Innenseckskantmadenmadenschraube steel, which passes through the "wall of the central part of the housing 4 and is screwed for example with a hexagon socket wrench against the clamping sleeve 5.

While Pig. Figure 1 shows the hand-assembled and ready-to-tension connecting element, Figure 2 shows the position of the various parts of the connecting element according to the controlled voltage which is manually made by the installer with a torque wrench before the line is put into operation. Fig. 3 shows relative displacements which the parts of the connecting element occupy, - after the plastic line 1 has been exposed to a large tensile stress caused, for example, by a shovel loader in the course of working away.

When comparing Figs. 1, 2 and 3 it can be seen that the. Teeth of the ferrule 1o and the pressure cone 12 have sunken into the thickness of the plastic line 1 and that held by the orientation of the teeth, the end of this plastic line 1 inside the connecting element. "In addition, the self-clamping property of this connecting element can be checked, since everyone on the Plastle .1 train exerted automatically the forcing of the ferrule 16 and the pressure cone 12 into the interior of the clamping sleeve 5 causes, ie an increased voltage of the end of the plastic line 1, although the clamping sleeve 5 and the housing 4 are held by the grub screw 27 in position.

Claims (8)

232587 4 Request for a claim Ί. 12, 1981 AP P 16- L / 232 587 59 493/28 -ΙΟConnecting element between a 'plastic line for fluids under pressure and a metallic conduit, characterized in that it comprises the following axisymmetric metal parts: - one. Ferrule (16), which opens into the interior of the end of the plastic, line (1) and is provided on its outer surface with an annular toothing (18), which is in contact with the inner wall of said end of the line, and a collar (17) who is on the - Cut surface of the plastic line (1) into abutment , J.C.A. - A pressure cone (12) having a plurality of sectors separated by equalizing gaps, which surrounds the plastic line (1) and on its inner surface with an annular en. Toothing (15) which is in contact with the outer wall of the plastic conduit (1) and which has a conical outer surface and a base (13a), - A clamping sleeve (5) having one end of a cylindrical outer surface and a conical bore (11) which connects to the conical surface of the pressure cone (12) and whose second, cylindrical end has an inner diameter which is slightly larger than that outer diameter of the plastic line (1), wherein the annular teeth (15; 18) of the cone (12) and the clamping sleeve (5) have a sawzahnförmiges profile whose end faces (19) to the collar (17) of the ferrule (16) is rotated are, - A housing (4), whose one end is fixed to the metallic conduit and which has an inner projection (24) which lies on the collar (17) of the clamp (16) in abutment. 2. Connecting element according to item 1, characterized in that it comprises a first toric seal (25) which is mounted in an annular groove which is incorporated in the inner wall der.Mittelpartie of the housing (4). 3. Connecting element according to one of the preceding points, characterized in that it comprises a second seal (26) which is mounted in an annular groove which is incorporated in the inner wall of the second end of the clamping sleeve (5), 4.-connection element according to one of the preceding points, characterized in that the conical surfaces of the pressure cone (12) and the clamping sleeve (5) have a taper of fifteen bis.zwanzig percent, 5. Connecting element according to one of the aforementioned points, characterized in that it comprises a mounted in the wall breakthrough steel sleeve (6), whose one end to the second Snde of the clamping sleeve (5) is welded and the steel sleeve (6) with an insulating layer (7 ) is encased in polyethylene, 6. Connecting element according to one of the preceding points, characterized in that the annular toothings (15; 18) of the ferrule (16) and the pressure cone (12) have blunting operations (20), 7 »12. 1981 AP P 16 L / 232 59 493/28 232 5 87 4 --- 7. Connecting element according to one of the preceding points, characterized in that it comprises on the clamping sleeve (5) blocking means for the housing (4). 7, 12, 1981 AP P 16 L / 232 587 -> O0CQ7 / 59 493/28 232 5 87 4 -11 - 8 «connecting element according to the item 7, characterized in that the blocking means of at least one Madenschrau.be (27) are formed, which extends through the wall of the Eittelpartle of the housing (4) and is screwed against the clamping sleeve (5). For this 3 pages drawings