DE102006062238B3 - Strain-resistant pipe connection for plastic pipelines has collar with at least one spring element acting on securing arrangement opposite to pipe insertion direction - Google Patents

Abstract

The connection has a collar (11) with an inner peripheral groove (14) narrowing conically towards the collar-s opening and a securing arrangement (19) for holding the inserted pipe with a supporting ring with spreadable clamp elements for engaging the groove with friction enhancing material (28,30) on the inner surfaces. The collar has at least one spring element acting on the securing arrangement opposite to the pipe insertion direction (E).

Description

The The invention relates to a tensile pipe connection for plastic existing pipelines, with a sleeve, which extends to the socket mouth in the Essentially conically tapered Inner circumferential groove and with a securing means for mounting the inserted into the sleeve pipe, which is a support ring with one opposite the Pipe slightly includes larger diameter, the at least two axially extending into the sleeve, in the Inner contour of the inner circumferential groove einliegende and elastic radially having expandable clamping elements whose radially inwardly directed surfaces with frictional increasing Means are provided and the radially outwardly directed surfaces of Clamping elements cooperate with the conical Innenumfangsnut, that one against the tube insertion direction on the pipe connection acting tension clamping forces increased between pipeline and securing means.

The DE 198 51 162 A1 discloses a plastic sleeve for connecting plastic pipes of the same or approximately the same diameter for pressurized fluids, such as drinking or wastewater described. It is provided for pressure-tight and restrained receiving the plastic pipe to be connected with a widening and a sealing and a clamping ring, wherein between the expansion and the plastic tube to which the sleeve is provided, a Reduzierabschnitt is present and wherein the sleeve with a radial compressive forces receiving Arming part is provided. The reinforcing part is embedded as an integral component in the plastic of the sleeve.

Another generic pipe connection is, for example DE 198 13 762 C1 known. Typically, the securing means is inserted into the socket mouth, so that a flange of the support ring abuts against the mouth end face, while the clamping elements einliegen in the inner circumferential groove and are slightly biased radially inwardly.

At the Pushing a pipe into the sleeve, the clamping elements slightly spread and lie frictionally on the outer peripheral surface of the Pipe on.

Under against the tube insertion direction acting tension slides the pipe tends towards the socket mouth, which frictionally to the outer peripheral surface fitting securing means this movement follows. The conical inner peripheral groove acts on the clamping elements and presses against the outer surface of the Pipeline. The frictional engagement between the outer surface of the pipe and the Increased clamping elements itself and slipping out of the pipe from the sleeve is prevented.

DE 198 13 762 C1 suggests pre-fixing the securing means after inserting the pipeline. For this purpose, a lever tool is attached between the support ring and the sleeve, by means of which the securing means is moved against the pipe insertion direction. In this way, a tensile pipe joint is produced, the holding forces are further reinforced by acting on the pipe tensile forces.

These In itself advantageous assembly becomes regarding your handling but as an improvement considered.

task The invention is a high-tensile pipe joint with prestressed To provide clamping elements of a securing means, in which the prefixing is considerably simplified.

The Task is a tensile pipe connection with the features of claim 1, in particular with the characterizing features, according to which the sleeve at least one against the tube insertion direction on the Has securing means acting spring element, which in cooperation with the conically tapered Inner circumferential groove, the clamping elements of the securing means under increased bias puts.

Compared to the mentioned prior art omitted the necessary after the insertion of the pipeline prefixing by means of a lever tool. The for the production of tensile pipe joint necessary bias of the clamping elements against the outer surface of the Piping takes place by means of the spring element in cooperation with the conical inner circumferential groove. The spring element tends to pull the securing means out of the sleeve, wherein the conical peripheral contact surface the Innenumfangsnut the clamping elements of the securing means against the outer surface of the pipeline pressed. In this way, a tensile pipe joint is made, whose holding forces Tensile forces acting on the pipeline are further increased.

Around the construction and maintenance of the tensile pipe connection according to the invention To simplify substantially, it is provided that at least a spring element acts on the support ring, arranged in the region of the socket mouth and is secured by means of retaining means on the sleeve.

In order to increase the frictional engagement between the clamping elements of the securing means and the outer circumferential surface of the pipeline, it is provided that that the spring element is biased against the tube insertion direction.

Especially preferred is an embodiment the invention in which the spring element as the sleeve mouth surrounding Disc spring is formed. In addition to the advantageous deformation behavior let yourself a diaphragm spring in connection with a tensile pipe joint very easy to handle.

In a simplest embodiment of a conical against the tube insertion direction Preloaded plate spring, this must only between the support ring of the Resting means and the end face of the mouth rest.

Farther the plate spring can serve as a support ring for the securing means and in one piece with be formed of the securing means. Accordingly, the diaphragm spring would be part of the securing means, so that no separate component necessary is.

Becomes a plate spring designed as a separate component is used according to the invention, is the retaining means as incorporated in the front of the sleeve, the socket mouth surrounding depression formed with a boundary edge, the a radially inwardly directed groove for receiving the plate spring having.

If the diaphragm spring in one piece is formed with the clamping elements, the holding means is preferred as a coupling ring sitting on the socket formed, in particular if this is axially movable on the sleeve is stored to increase one the clamping forces necessary movement of the securing means against the tube insertion direction to ensure.

The The following description of three embodiments shows more Advantages of the invention. It shows:

1 a first embodiment of the invention with arranged in a sleeve securing means and separately formed plate spring,

2 a representation according to 1 with inserted into the socket pipe,

3 A second embodiment of the invention with a trained as a support ring plate spring for the securing means,

4 the representation according to 3 with inserted into the socket pipe,

5 a third embodiment of the invention with integrally formed with the disc spring securing means

6 a representation according to 5 with inserted pipeline and

7 a representation according to 6 with under tension pipeline.

A high-tensile pipe connection is hereinafter in total with the reference numeral 10 Mistake.

The tensile pipe connection 10 includes a sleeve 11 with a socket mouth 12 for inserting a pipeline 13 , The sleeve has in tube insertion direction E a first inner circumferential groove 14 and a second inner circumferential groove 15 on, wherein the second inner circumferential groove of the receiving a sealing ring 16 for sealing the tensile pipe connection 10 serves.

The circumferential groove 14 has a conical, so diameter-tapering, to the socket mouth tapering circumferential contact surface 17 on, in which clamping elements 18 of the arranged within the socket mouth securing means 19 einliegen. The securing means 19 is present as a ring with individual, independent clamping elements 18 educated. Of the large number of circumferentially juxtaposed clamping elements 18 For the sake of clarity, only one is shown.

The clamping elements 18 are over a joint zone 20 elastically resilient with a support ring 21 of the securing means 19 connected. The support ring itself has at its the clamping elements 18 facing away from a flange 22 by means of which he is attached to a plate spring 23 supported. The plate spring 23 is present in a depression 24 the sleeve end face and there in a radially inwardly directed retaining groove 25 one the depression 24 bounding edge 26 inserted and biased against the pipe insertion direction E.

The clamping elements 18 have a radially inward bias.

To produce a tensile pipe joint is in 2 the pipeline 13 through the annular securing means 19 in tube insertion direction E has been inserted into the sleeve. The pipeline slides 13 by the diameter of the pipeline 13 slightly larger support ring 21 into the area of the clamping elements 18 ,

The radially inwardly directed, prestressed clamping elements 18 be from the pipeline 13 widening in the inner circumferential groove 14 spread in and come to rest on the conical peripheral contact surface 17 , As a white teres evasion of the clamp body 18 radially outward through the circumferential contact surface 17 is limited, initially increases the frictional engagement between the outer circumferential surface 27 the pipeline 13 and the frictionally increasing means 28 provided inner surface 29 the clamp body 18 ,

In the present case, the friction-increasing means are barb-like counter to the tube insertion direction E acting teeth 30 which part of a form-fitting in the clamping body 18 inserted grip shoe 31 are.

Alternatively, the friction-increasing means 28 as einstückigstoffschlüssige components of a plastic clamping element 18 be formed, furthermore, is also a corundum coating of the inner surface 29 the clamping elements 18 conceivable.

The increase of frictional forces between the outer circumferential surface 17 and the teeth 30 of the grip shoe 31 cause the annular securing means 19 the pipeline 13 in tube insertion direction E in the sleeve 11 in against the spring tension of the plate spring 23 follows.

The bias of the diaphragm spring 23 causes thereby the the Gripschuh 31 opposite rear surface 32 the clamping elements 18 during the insertion process at the peripheral contact surface 17 the inner circumferential groove 14 is applied and the securing means 19 tends towards the pipe insertion direction E, between the outer surface 27 and circumferential contact surface 17 wedging, out of the sleeve 11 is pulled out. This will be the clamp body 18 from the peripheral contact surface 17 frictionally increasing against the lateral surface 27 the pipeline 13 pressed.

Will the pipeline 13 set against the pipe insertion direction E under tension Z, there is already sufficient, radially inwardly acting bias of the clamping elements 18 so that the teeth 30 of the grip shoe 31 already after a slight movement of the pipeline 13 from the sleeve 11 out into the outer surface 27 the pipeline 13 intervention. The due to the tensile stress Z in cooperation with the conical inner circumferential groove 14 and the sprags 18 clamping forces acting on the pipeline, hold the pipeline 13 safe in the sleeve 11 ,

In the 3 and 4 is a second embodiment of the tensile pipe joint 10 represented according to the invention. The statements made above also essentially apply to this exemplary embodiment. In contrast to the first embodiment, the backup medium 19 a plurality of circumferentially arranged side by side fuse bodies 33 of which in the 3 and 4 only one representative is shown.

Every fuse body 33 includes a clamping element 18 , which has a joint zone 20 with a support element 34 is connected and on its side facing away from the clamp body a holder 35 for attachment to the diaphragm spring 23 having. In this embodiment, the plate spring forms 23 the support ring for in its entirety with 19 designated, from individual fuse bodies 33 existing security funds.

For the production of in the 4 shown tensile strength pipe joint 10 will go to the description 2 directed.

A third embodiment of the invention is in the 5 to 7 shown. Also on this embodiment, the preceding, basic description reads.

In further education in the 1 to 4 illustrated embodiments, are the diaphragm spring 23 and the securing means 19 integrally formed.

Whether, as in the 1 and 2 , one with 21 designated support ring several, separate clamping elements 18 or the securing means 19 from a variety of fuse bodies 33 is formed, is irrelevant in the present case. Characteristic of this embodiment is merely that the plate spring 23 and the support ring 21 or the diaphragm spring 23 and the fuse bodies 33 formed integrally with each other. Therefore, in the present case, the clamping elements 18 with the diaphragm spring 23 connecting area of the securing means 19 both with the reference number 21 as well as the reference number 33 Mistake.

In 6 is the tensile pipe joint 10 after inserting the pipeline 13 through the securing means 19 in the sleeve 11 shown. In that regard, reference is made to the statements made above.

The third, in the 5 to 7 illustrated embodiment differs in addition to the integral formation of plate spring 23 and securing means 19 essentially in the attachment of the diaphragm spring 23 on the sleeve 11 , For this purpose, an axially in Rohrinschubrichtung E and direction of the tension Z movably mounted coupling ring 36 intended. The Überwurfring 36 guaranteed, like 7 shows that the securing means 19 within the inner circumferential groove 14 can be spent in its lying in the direction of the tension Z end position.

In a comparative analysis of 5 to 6 it is noticeable that under very high tension at a fixed attachment of the plate spring 23 on the sleeve 11 the plate spring 23 one of the movement direction Z of the clamping elements 18 opposite force builds up and the movement of the clamping body 18 obstructed within the inner circumferential groove. This could, in case of doubt, lead to over the clamping elements 18 insufficient, the pipeline 23 in the sleeve holding clamping forces can be exercised. This danger is by means of the axial movable fixing of the plate spring 23 on the sleeve 11 through the Überwurfring 36 Effectively avoided because the maximum movement of the clamp body 18 in the direction of the tension Z is guaranteed.

Also for fixing the diaphragm spring 23 on the sleeve 11 in the 1 to 4 can - in a manner not shown - a Überwurfring be used. However, this is axially immovable on the sleeve 11 stored and holds the disc spring 23 between itself and the front of the sleeve 11 ,

Claims (12)

Tensile pipe connection ( 10 ) for plastic pipelines ( 13 ), with a sleeve ( 11 ), the one to Muffenmündung ( 12 ) substantially conically tapered inner circumferential groove ( 14 ) and with a securing means ( 19 ) for holding in the in the sleeve ( 11 ) inserted pipe ( 13 ), which has a support ring ( 21 ) with one opposite the pipeline ( 13 ) of slightly larger diameter, the at least two axially in the sleeve ( 11 ) extending, in the inner contour of the inner circumferential groove ( 14 ) insertable and elastically radially expandable clamping elements ( 18 ) whose radially inwardly directed surfaces ( 29 ) with friction-enhancing means ( 28 . 30 ) and the radially outwardly directed surfaces ( 32 ) of the clamping elements ( 18 ) in such a way with the inner circumferential groove ( 14 ), that one against the tube insertion direction (E) on the pipe connection ( 10 ) acting tensile stress (Z) clamping forces between pipeline ( 13 ) and securing means ( 19 ), characterized in that the sleeve ( 11 ) at least one against the tube insertion direction (E) on the securing means ( 19 ) acting spring element ( 23 ) having. Tensile pipe connection according to claim 1, characterized in that the at least one spring element ( 23 ) on the support ring ( 21 ) acts. Tensile pipe connection according to claim 1 or 2, characterized in that the spring element ( 23 ) in the area of the socket mouth ( 12 ) is arranged. Tensile pipe connection according to one of the preceding claims, characterized in that the sleeve ( 11 ) at least one holding means ( 25 . 36 ) for the spring element ( 23 ) having. Tensile pipe connection according to one of the preceding claims, characterized in that the spring element ( 23 ) is biased against the tube insertion direction (E) Tensile pipe connection according to one of the preceding claims, characterized in that the spring element ( 23 ) than the socket mouth ( 12 ) surrounding disc spring ( 23 ) is trained. Tensile pipe connection according to claim 6, characterized in that the plate spring ( 23 ) as a support ring ( 21 ) for the securing means ( 19 ) is trained. Tensile pipe connection according to claim 7, characterized in that the securing means ( 19 ) and the plate spring ( 23 ) are integrally formed. Tensile pipe connection according to claim 4 and 6, characterized in that the retaining means ( 25 ) as in a front side of the sleeve ( 11 ), the socket mouth ( 12 ) surrounding depression ( 24 ) with a boundary edge ( 26 ) is formed, which has a radially inwardly directed groove ( 25 ) for receiving the diaphragm spring ( 23 ) having. Tensile pipe connection according to claim 4 and 8, characterized in that the retaining means ( 36 ) than on the sleeve ( 11 ) seated coupling ring ( 36 ) is trained. Tensile pipe connection according to claim 10, characterized in that the coupling ring ( 36 ) at least axially movable on the sleeve ( 11 ) is stored. Tensile pipe connection according to one of the preceding claims, characterized in that the spring element ( 23 ) is made of plastic.