DE10161092A1 - Bayonet union and adapter for two pipes placed end-to-end - Google Patents

Abstract

Two pipes are joined by bayonet-fit pipe fittings in which the pipes and fittings are presented end-to-end, inserted, and twist-locked. The pipe fittings are separated by an adapter ring (16) with apertures (18) and nipples engaging with the pipe sections either side, and a twist-lock.

Description

The invention relates to a device for connecting a first Pipe section with a second pipe section by means of a Bayonet lock arrangement, in which corresponding noses and Recesses after plugging together axially and subsequent Relative rotation of the pipe sections lock the device tight.

Such a device is by obvious prior use known and also described in DE 41 10 676 C2. This document relates to a device for connecting a first piece of pipe with a second piece of pipe, in particular a casing pipe Fire hydrant with a water pipe installed in the ground connecting piece, using a Bayonet lock arrangement in which the first piece of pipe is evenly attached to its Distributed outer circumference, radially projecting lugs and the second pipe section adapted its inner surface to the free edge over the noses Recesses have partially open, circumferential grooves, the Connection is made so that the first pipe section into the second pipe section is used, the lugs are guided axially through the recesses and then the first piece of pipe is twisted and the lugs into the Slide grooves.

If such a pipe connection of two pipe sections at one Hydrant is used, then there is the problem that the first Pipe section opposite the second pipe section due to the Road shocks twisted, so that first pipe section due to the water pressure from the second pipe section is pushed out.

To prevent this, DE 41 10 676 C2 proposes, at least a locking element assigned to the first tube piece to provide, which has axially extending projections into the recesses are insertable and up to the radially extending end edge Wall of the grooves are sufficient. These axially extending extensions are on attached an annular body, which after the plug-and-turn coupling two pipe sections from the first pipe section against the second is pushed so that the projections into the recesses of the second Enter the pipe section and thus turn back the connection prevent.

This known device has proven itself in practice and so far not to criticize. The object of the present invention is a to provide advantageous alternative.

The invention solves this problem with the features of Claim 1 and is accordingly characterized by a Adapter ring, the one with openings for engaging the nose of the is provided first pipe section and on the other hand radially projecting Has noses for engagement in recesses as part of the Bayonet lock arrangement of the second pipe section serve and that An anti-rotation device is provided, which the second pipe section and the Hold the adapter ring in the locked position so that it cannot rotate with respect to one another.

This adapter ring can consist of a one-piece ring body consist, but preferably also of two half-shells be composed that are identical to each other. In the simplest case they are Adapter ring or the half-shells formed as injection molded parts. On the other hand, the half-shells can also be separated by separating one be produced in one piece ring body.

According to an embodiment of the invention the anti-rotation lock a bolt that is in the locked position of the Device at least partially in each case in the adapter ring and in the second pipe piece engages. The bolt can essentially be arranged parallel to the longitudinal axis of the device and at least the adapter ring and / or the second pipe section partially penetrate axially.

The handling of the device according to the invention is conceivable simple. For example, the first piece of pipe is in the form of a Cast body in front with radially projecting lugs, so the two Half-shells with their openings on the outward-facing noses set of the first pipe section, with a clamp fit of large The advantage is so that the half shells during the further work on the Device can not fall from this. Are the two Half shells, which now form a two-part adapter ring, on attached the first pipe section, so the second pipe section can be coupled, in the manner of a conventional Bayonet lock, d. H. first by axially plugging and subsequent relative rotation by 45 ° as a rule, if one as given that the bayonet lock assembly on each of the two pipe sections each has four cams that are in uniform Distances are arranged around the circumference of the pipe sections. After this Turning into the locking position is secured by moving the Anti-rotation fixes, in particular a bolt in prepared holes in the adapter ring and the second pipe section, preferably pressed in so that it cannot be loosened involuntarily.

The device according to the invention described so far is very simple to set up and use. About that In addition, the adapter ring offers opportunities for skillful Development of the device in the sense that the first piece of pipe is not alone one with radially outwardly projecting lugs into consideration comes, but also other pipes, especially those made of steel or also plastic with smooth outer surfaces, which are not inherently suitable for a bayonet lock because they do not have the required have protruding noses.

In this sense, the invention provides a further development of the Adapter rings in such a way that in the inner surface of the adapter ring Breakthroughs axially upstream, an annular receiving chamber with tapering towards the end of the first pipe section Internal diameter for a grip ring is incorporated. By means of this Grip rings can also be used using the adapter ring Establish tensile pipe connections with smooth-walled first pipe sections made of metal or plastic. Special designs are shown below based on the description of exemplary embodiments.

Further advantageous configurations and features of the invention result from the subclaims not previously cited as well from the following description of several in the drawings illustrated embodiments. The drawings show:

Fig. 1 is an end view of the coupling side of a second tube piece,

Fig. 2 is a partial longitudinal section through the second tube section corresponding to the section specified BB in Fig. 1,

Fig. 3 is an end view of a group consisting of two half-shells adapter ring,

Fig. 4 in the upper half of a longitudinal section through an adapter ring half-shell and in the lower half of an external view,

Fig. 5 shows a cross section corresponding to the section specified AA in Fig. 4,

Fig. 6 shows a first tubular joint in a longitudinal half-section, wherein the first pipe piece is one having radially outwardly projecting lugs for bayonet locking,

Fig. 7 is a corresponding half-section showing a second embodiment of a pipe joint, wherein in a particular chamber of the adapter ring, a simple grip-ring is inserted for a pipe joint with a smooth-walled pipe as a first pipe piece,

Fig. 8 is a Fig. 7 corresponding view of a variant with a special gear-grip ring,

Fig. 9 shows another embodiment shown in partial longitudinal section with a third alternative of a grip ring and

FIGS. 10 and 11 detail views in the region of the outer flange of the adapter ring for illustrating various possibilities of bandaging the adapter ring half shells.

The second pipe section 10 , reproduced on a reduced scale in FIGS. 1 and 2, is evidently a sleeve. This is preferably made of thermoplastic material and has a sleeve section 10 a and a pipe section 10 b, on the ring end face 10 b, a plastic pipe is welded.

The second pipe section 10 has a first axially directed bore 11 for use of a pin or bolt as a rotary stop. A second axial bore is designated by 12. It is used to drive in a bolt or pin for an anti-rotation device, which will also be described later.

As can be seen when looking at FIG. 1 with a view of the end face of the sleeve section 10 a of the second pipe section 10 , four substantially radially inwardly pointing lugs 13 and thus alternating recesses 14 are arranged in the circumferential direction at regular intervals. The lugs 13 and the recesses 14 are part of a bayonet lock arrangement, which will be described later. For this, an inner circumferential groove 15 running inside the sleeve section 10 a is also important, which serves to receive radial projections of the component to be coupled directly to the second pipe section 10 .

This component is an adapter ring 16 shown in FIGS . 3 to 5, which comprises two identical half-shells 17 . Deviations from this principle are explained below. It is essential first of all that the two adapter ring half-shells 17 shown in FIGS . 3 to 5 complement each other to form a circumferential ring body. The latter has lugs 18 distributed over its outer circumference at regular intervals, with recesses 19 or recesses located between them. With regard to each adapter ring half-shell 17 , the arrangement is made in such a way that a complete nose 18 is formed in a central plane E and only half of each nose in the region of the parting line 20 , which is indicated in this regard by the reference symbol 18 '. Two "half-tabs" 18 'thus complement each other in the assembled half-shells 17 to a nose 18th

The adapter ring 16 or the assembled adapter ring half-shells 17 have a circumferential flange 21 of relatively small diameter at one end and an annular flange 22 of larger diameter at the other end. Each of these flanges 21 and 22 contains an outer circumferential groove 23 and 24 for receiving an O-sealing ring 37 , 38 cf. z. B. Fig. 6.

In the region of the parting line 20 , each half-shell 17 has a blind bore 25 on one side and a peg-shaped projection 26 on the other side. The inside diameter of the blind bore 25 is matched to the outside diameter of the pin 26 in such a way that, when plugged together, there is a press fit which enables the two half-shells 17 to be held together in a releasable but otherwise reliable manner.

Furthermore, the adapter ring 16 has a total of four openings 27 . For reasons of injection molding in the sense of the simplest possible shape design, these openings are essentially in the same peripheral areas as the lugs 18 . Again, the arrangement is such that a complete opening 27 is arranged in the plane of symmetry E of each half-shell 17 and near the parting line 20 two "half-openings", which are designated by 27 'and add to an opening 27 when the two half-shells 17 are joined to form a ring.

As is apparent from Fig. 4, there are the openings 27 and the half-openings 27 'in a region between the lugs 18, 18' and the smaller outer flange 21.

Finally, a bore 28 can also be seen in FIG. 3, which presents itself as a completely encircled bore 28 in the larger flange 22 and as an edge recess 29 on the outer circumference of one of the lugs 28 . The bore arrangement 28 , 29 , when brought into line with the bore 12 in the second pipe section 10 ( FIGS. 1 and 2), serves for the engagement or penetration of a securing bolt 31 (see further figures), which serves in the operating position of the pipe connection to hold the adapter ring 16 or an adapter ring half-shell 17 in a rotationally fixed manner with respect to the second pipe section 10 .

As can also be seen from FIG. 4, the adapter ring 16 has an inner circumferential groove 32 with a conical groove base 33 , so that the inner diameter of the groove 32 decreases continuously from the side of the smaller diameter flange 21 to the side of the larger flange 22 ,

Referring now to FIG. 6, a first tensile pipe connection is shown using a second pipe section 10 , two adapter ring half-shells 17 and a first pipe section 34 . With this pipe section 34, it should be assumed - which cannot be seen in the drawing - that it has four lugs 35 projecting radially outwards at regular circumferential intervals, as is the case, for example, with a casing pipe of a hydrant. It is further assumed that the first pipe section 34 can primarily be a cast pipe body.

As shown in FIG. 6, the two adapter ring half-shells 17 are mounted on the first pipe section 34 in such a way that their lugs 35 can engage in the openings 27 . This is achieved in a simple manner in that the two adapter ring half-shells 17 are placed radially from the outside in a corresponding axial assignment on the jacket of the first pipe section 34 . The openings 27 are preferably dimensioned in particular in their circumferential direction in such a way that they can be pushed onto the lugs 35 with a certain interference fit, which favors the adhesion of the relevant half-shell 17 to the second pipe section 34 .

To produce a pipe connection shown in FIG. 6, the first pipe section 34 provided with the adapter ring half-shells 17 is first axially coupled to the second, sleeve-like pipe section 10 by axially pushing one another in such a way that in each case first lugs of the adapter ring half-shells 17 and recesses face the second pipe section 10 . In the axial end position, the pipe sections 34 and 10 are then rotated relative to one another, in the case of four noses by 45 °, so that the noses of the adapter ring half-shells 17 engage behind the noses of the second pipe section 10 . This end position is limited by the abovementioned rotary stop by the abutment of a lug 18 of the adapter ring 16 on a bolt or pin (not shown) inserted in the bore 11 (see FIG. 1). In this end position, the bores 28 and 29 are in alignment, so that the axial securing bolt 31 can now be inserted. In order to be able to pull out the securing bolt 31 in a simple manner if necessary, it has a transverse bore 36 for the attachment of a tool or for hanging in a drawbar eye.

The initially with reference to FIG. 4 described flanges 21 and 22, circumferential grooves 23 and 24 support the above-seen in FIG. 6 O-ring seals 37 and 38. Two further seals of the device are designated by 39 and 40, of which the seal 39 is a fluid sealing ring known under the name Tyton ring, which is received in an adapted inner circumferential groove 41 of the second pipe section 10 , while the outer sealing ring 40 is an O -Ring is, which is located in an end circumferential groove 42 of the adapter sealing ring 16 formed from the adapter ring half-shells 17 .

If the pipe connection is under internal pressure or other mechanical forces occur which try to pull the two pipe sections 10 and 34 apart, the adapter ring half-shells 17 are inclined to move to the left within the sleeve 10 with respect to FIG. 6. To this regard, additional force support in a central axial region of the adapter ring half-shells 17 and the first tube section 10 is 43 / provided an inclined surface mating 44 that is inclined approximately in the order of 10 ° to the longitudinal axis L of the device.

As described above, the adapter ring 16 , the openings 27 axially upstream, has the additional inner circumferential groove 32 . This has no significance for the type of pipe connection described with reference to FIG. 6 by means of a bayonet lock, but can be used for alternative pipe connections, in particular for first pipe pieces 45 with a particularly smooth jacket. This is shown in FIGS. 7 to 9 in various exemplary embodiments.

In Fig. 7, the first pipe section 25 is, for example, a smooth-walled steel pipe. In this case, a grip ring 47 is provided in the inner circumferential groove 32 with an adapted conical lateral surface 46 .

The inside of the grip ring 47 is provided with elements that promote static friction, for example with a corundum layer or with a vulcanized inner ring, as can be seen, which has serrations. In addition, the grip ring 47 is slotted at a circumferential point, so that it can be introduced into the annular space 32 while temporarily reducing the diameter. Due to the conical face pair 33/46 of the grip ring 47 moves into the groove 32 of the adapter ring 16 with respect to Fig. 7 to the left when tensile forces or internal pressure acting on the grip ring 47. At the same time, its diameter is reduced. The greater these forces are, the more firmly the grip ring 47 claws into the outer surface of the first pipe section 45 . A pipe connection secured in this regard against separation is shown, for example, in DE 37 36 587 A1, to which reference is hereby made for further explanation of the operating principle.

FIG. 8 shows a tensile tube connection comparable to FIG. 7, but with a different grip ring 48 . This grip ring 48 , which is described in detail in DE 198 13 762 C1, is particularly suitable for first pipe pieces 49 consisting of plastic such as polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP) or the like. With express reference to DE 198 13 762 C1, it should be noted here that the grip ring 48 is provided with an outer support ring 50 , on which individual clamping bodies 51 spaced apart from one another in the circumferential direction are formed. These clamping bodies 21 are also essentially radially movable with respect to the support ring 50 , so that they can be easily inserted into the inner circumferential groove 32 of the adapter ring 16 . A circumferential end flange 52 of the support ring 15 lies in an end face inner circumferential groove 53 of the adapter ring 16 . With the aid of an impression device implemented by screws 54 in this exemplary embodiment, the securing ring 48 can be pretensioned. With reference to FIG. 8, it then shifts to the left in the axial direction and can thus grip the outer jacket of the first tube piece 49 before axial tensile forces become effective which further increase this radial pressing force of the grip ring segments.

FIG. 9 shows a third tensile pipe connection with a grip ring 55 which is mounted in the groove 32 of the adapter ring 16 and which has, for example, a layer 56 of corundum which increases static friction on its inner circumference.

With 57 an auxiliary assembly ring is designated, the inside diameter of which is smaller than the inside diameter of the unloaded grip ring 55 , so that the first tube piece 58 can be inserted without frictional or sliding contact with the grip ring 55 . Only after the first pipe section 58 has been pushed in is the assembly aid ring keeping the grip ring 55 spread apart again, so that the grip ring 55 can then grip the jacket of the first pipe section 58 due to its diameter reduction. Again, the inclined surface pairing 33/46 is again an increasing diameter reduction, thus increasing the clamping force of the grip ring 55 in accidental deployment. Such a grip ring arrangement with the aid of an auxiliary assembly ring 57 is described in EP 0 690 257 B1 in all its details, to which reference is hereby made.

As regards the use of a self-contained one-piece adapter ring 16 or its division into two half-shells 17 , it should be noted that in the embodiment according to FIG. 6, the first tube piece 34 being provided with fixed, radially outwardly projecting lugs 35 , the adapter ring cannot be formed in one piece. The half-shells 17 are therefore used here in any case.

In the other exemplary embodiments described, a one-piece and one-piece adapter ring 16 can be used. It should be noted, however, that it is easier, particularly by injection molding, to manufacture two half-shells that are identical to one another than a circumferential ring, especially since the cutouts and protruding noses therein can cause problems with undercuts in the tool.

Nevertheless, adapter ring half-shells 17 can also be used in the exemplary embodiments according to FIGS . 7 to 9. Even if these are not held together to form an annular body by special means, they can be used without further ado. An external view only gives an unpleasant impression to the extent that the two half-shells diverge under pressure and their joints can become visible. To prevent this, a bandage 59 is provided, as shown in FIGS . 9 to 11, which in the exemplary embodiment shown comprises the outer circumferential flange 22 of the adapter ring half-shells 17 . The bandage 59 can be a steel ring which, as can be seen in FIG. 9, is integrated in a circumferential shoulder step of the flange 22 , on the inside, so that the flange 22 still covers the bandage 59 on the outside.

FIG. 10 shows a simple alternative with the bandage 59 lying only flat, whereas the alternative according to FIG. 11 illustrates that the bandage can also be arranged in an outwardly opening heel step of the flange 22 .

Claims (19)

1. Device for connecting a first pipe section ( 34 ) to a second pipe section ( 10 ) by means of a bayonet locking arrangement, in which corresponding noses ( 13 ; 18 ) and recesses ( 19 ; 14 ) after axial plugging and subsequent relative rotation of the pipe sections ( 10 , 34 ) lock the device in a tension-proof manner, characterized by an adapter ring ( 16 ) which is provided on the one hand with openings ( 18 ) for engaging lugs ( 35 ) of the first pipe section ( 34 ) and on the other hand has radially projecting lugs ( 18 ) for engaging in Recesses ( 14 ) serve as a component of the bayonet lock arrangement of the second pipe section ( 10 ) and that an anti-rotation device ( 31 ) is provided, which holds the second pipe section ( 10 ) and the adapter ring ( 16 ) in a non-rotatable manner in the closed position. 2. Device according to claim 1, characterized in that the adapter ring ( 16 ) is composed of two half-shells ( 17 ). 3. Device according to claim 1 or 2, characterized in that the half-shells ( 17 ) are identical to one another. 4. Apparatus according to claim 2 or 3, characterized in that on the mutually facing end faces of the half-shells (179 plug-in coupling means, in particular in the form of pins ( 26 ) and pin receptacles ( 25 ), are formed to hold the half-shells ( 17 ) together. 5. Device according to one of claims 1 to 4, characterized in that the adapter ring ( 16 ) or the half-shells ( 17 ) are designed as injection molded parts. 6. Device according to one of claims 2 to 5, characterized in that the half-shells ( 17 ) are obtained by transverse separation of a ring body made in one piece. 7. Device according to one of the preceding claims, characterized in that the lugs ( 18 ) and the openings ( 27 ) on the adapter ring ( 16 ) are each arranged in the same peripheral regions. 8. Device according to one of the preceding claims, characterized in that the parting planes (joint 20 ) of the adapter ring ( 16 ) or the half-shells ( 17 ) run substantially centrally through lugs ( 18 ') and openings ( 27 '). 9. The device according to claim 1, characterized in that the anti-rotation device comprises a bolt ( 31 ) which in the closed position of the device engages at least partially in each case in the adapter ring ( 16 ) and in the second pipe section ( 10 ). 10. The device according to claim 9, characterized in that the bolt ( 31 ) is arranged to run substantially parallel to the longitudinal axis (L) of the device and at least partially axially penetrates the adapter ring ( 16 ) and / or the second pipe section ( 10 ). 11. Device according to one of the preceding claims, characterized in that in the inner surface of the adapter ring ( 16 ), the openings ( 27 ) axially upstream, an annular receiving chamber ( 32 ) with tapering away from the end of the first pipe section ( 10 ) Inner diameter ( 33 ) for a grip ring ( 47 ; 48 ; 55 ) is incorporated. 12. The device according to claim 11, characterized in that the adapter ring ( 16 ) in its axially outer end region forms an annular gap ( 30 ) between itself and the jacket of the first pipe section ( 49 ; 58 ). 13. The apparatus of claim 11 or 12, characterized in that the adapter ring ( 16 ) forms an inner circumferential groove ( 42 ) in its axially facing outer end face. 14. Device according to one of the preceding claims, characterized in that the adapter ring ( 16 ) at or near its axial ends each have an annular flange ( 21 , 22 ) with an outer circumferential groove ( 23 , 24 ) for receiving a sealing ring ( 37 , 38 ) such as O. -Rings is provided. 15. The device according to one or preceding claims, characterized in that the second pipe section ( 10 ) has at least one rotation limit stop ( 11 ) for a nose ( 18 ) of the adapter ring ( 16 ). 16. Device according to one of the preceding claims, characterized in that the second pipe section ( 10 ) is a pipe sleeve made of thermoplastic material with a rear pipe section ( 10 a) for welding a plastic pipe. 17. Device according to one of the preceding claims, characterized in that the half-shells ( 17 ) of the adapter ring ( 16 ) are held together by a sleeve ( 59 ) encompassing them all around. 18. The apparatus according to claim 17, characterized in that the sleeve ( 59 ) engages around the outer flange ( 22 ) of the adapter ring ( 16 ). 19. The apparatus of claim 17 or 18, characterized in that the sleeve ( 59 ) is overlapped on the outside by the second pipe section ( 10 ).