DE10161092B4 - Device for connecting two pieces of pipe by means of a bayonet lock arrangement - Google Patents

Abstract

Device for connecting a first pipe section (34) to a second pipe section (10) by means of a bayonet lock 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 the engagement of lugs (35) of the first pipe section (34) and on the other hand has radially projecting lugs (18) which are used for engagement in recesses ( 14) serve as a component of the bayonet lock arrangement of the second pipe section (10) and that an anti-rotation device is provided which holds the second pipe section (10) and the adapter ring (16) in the closed position in a non-rotatable manner relative to one another.

Description

The invention relates to a device for connecting a first pipe section to a second pipe section by means of a bayonet lock arrangement, in which corresponding noses and recesses after axial plugging and subsequent relative rotation of the pipe pieces lock the device tightly.

Such a device is known from obvious prior use and also in DE 41 10 676 C2 described. This document relates to a device for connecting a first pipe section to a second pipe section, in particular a jacketed pipe of a hydrant with a connecting piece connected to a water pipe laid in the ground, by means of a bayonet lock arrangement, in which the first pipe section and radially projecting lugs distributed evenly on its outer circumference the second pipe section on its inner surface to the free edge over the lugs adapted recesses have partially open, circumferential grooves, the connection being made so that the first pipe section is inserted into the second pipe section, the lugs are guided axially through the recesses and then the the first piece of pipe is twisted and the lugs slide into the grooves.

If such a pipe connection at two pipe sections a hydrant is used, the problem is that the first piece of pipe opposite that second pipe section due to from traffic caused vibrations twisted so that the first piece of pipe due to the water pressure is pressed out of the second pipe section.

To prevent this from happening DE 41 10 676 C2 before, to provide at least one locking element associated with the first tube piece, which has axially extending projections that can be inserted into the recesses and extend to the radially extending wall of the grooves on the end edge. These axially extending extensions are attached to an annular body which, after the plug-and-turn coupling of the two pipe sections, is pushed from the first pipe section against the second, so that the projections enter the recesses in the second pipe section and thus prevent the connection from turning back.

This known device has proven in practice and not to be criticized in this respect. Object of the present invention is to provide an 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 first pipe section is provided and on the other hand has radially projecting lugs, those 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, the second pipe section and the adapter ring in the closed position non-rotatable to each other hold.

This adapter ring can be made from one one-piece ring body consist, but preferably also composed of two half-shells be identical to each other. In the simplest case the adapter ring or the half-shells are designed as injection molded parts. On the other hand, you can the half-shells also by separating one piece in the middle manufactured ring body to be kept in shape.

According to an embodiment of the Invention includes the anti-rotation lock a bolt which in the Locked position of the device at least partially in each case engages in the adapter ring and in the second pipe section. The Bolt essentially parallel to the longitudinal axis of the device be arranged and the adapter ring and / or the second tube piece at least partially penetrate axially.

The handling of the device according to the invention is very easy. 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 breakthroughs to the outside facing noses of the first pipe piece set, a clamp fit of great The advantage is to keep the half-shells on during further work the device cannot fall from it. are the two half-shells, which are now a two-part adapter ring train on the first pipe section attached, so the second pipe section can be coupled and like a conventional one Bayonet lock, that is, initially by axially plugging together and then Relative turning usually 45 °, assuming given, that the bayonet fitting arrangement on each of the two pipe sections, respectively has four cams that are evenly spaced around the circumference of the pipe pieces are arranged. After turning to the latch position it is secured by attaching the anti-rotation device, in particular So a bolt in prepared holes in the adapter ring and of the second pipe section uses, preferably pressed in, so that it is not involuntarily released can.

The device according to the invention described so far is very easy to set up and use. Furthermore the adapter ring offers possibilities for skillful development of the device in the sense that as the first piece of pipe not only one with radially outwardly projecting lugs comes into consideration, but also other pipes, especially those made of steel or plastic with smooth outer surfaces that not inherently for a bayonet lock, because they do not have the required protruding Have noses.

The invention sees in this sense a development of the adapter ring in such a way that in the Inner surface the adapter ring, the openings axially upstream, an annular Receiving chamber with itself in the direction away from the end of the first pipe section tapering Inside diameter for a grip ring is incorporated. Leave with this grip ring tensile pipe connections using the adapter ring manufacture with smooth-walled first pieces of pipe made of metal or plastic. Special designs are described below based on the description of exemplary embodiments explained in more detail.

Further advantageous configurations and features of the invention emerge from those not previously cited dependent claims as well as from the following description of several in the drawings illustrated embodiments. Show in the drawings

1 an end view of the coupling side of a second pipe section,

2 a partial longitudinal section through the second pipe section according to the section BB in 1 .

3 an end view of an adapter ring consisting of two half-shells,

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

5 a cross section corresponding to the section AA in 4 .

6 a first pipe connection in a semi-longitudinal section, the first pipe piece being one with radially outwardly projecting lugs for a bayonet lock,

7 a corresponding half-sectional view of a second embodiment of a pipe connection, a simple grip ring being inserted in a special chamber of the adapter ring for a pipe connection with a smooth-walled pipe as the first pipe section,

8th a 7 corresponding representation of a variant with a special ring gear grip ring,

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

10 and 11 Detail representations in the area of the outer flange of the adapter ring to illustrate various options for bandaging the adapter ring half-shells.

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

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

How to look at 1 with a view of the front of the socket section 10a of the second pipe section 10 sees, are four in the circumferential direction at regular intervals substantially radially inwardly facing lugs 13 and thus alternating recesses 14 arranged. The noses 13 and the recesses 14 are part of a bayonet lock arrangement, which will be described later. For this there is still one inside the socket section 10a inner circumferential groove 15 of importance for receiving radial projections with the second pipe section 10 directly to be coupled component.

This component is one in the 3 to 5 adapter ring shown 16 , which has two identical half shells 17 includes. Deviations from this principle are explained below. First of all, it is essential that the two of them 3 to 5 visible adapter ring half shells 17 to form a circumferential ring body. This has noses distributed at regular intervals over its outer circumference 18 on, with recesses in between 19 or jumps back. Regarding each adapter ring half-shell 17 is the arrangement made so that in a central plane E a complete nose 18 is trained and in the area of the parting line 20 one nose each only half, what in this regard with the reference symbol 18 ' is indicated. Two "half noses" 18 ' thus complement each other when half shells are assembled 17 to a nose 18 ,

The adapter ring 16 or the assembled adapter ring half shells 17 have a circumferential flange at one end 21 relatively small diameter and an annular flange at the other end 22 larger diameter. Each of these flanges 21 and 22 contains an outer circumferential groove 23 respectively. 24 to accommodate an O-seal ring 37 . 38 6

In the area of the parting line 20 points each half shell 17 a blind hole on one side 25 and a cone-shaped projection on the other side. The inside diameter of the blind hole 25 is on the outside diameter of the pin 26 coordinated in such a way that there is a press fit when plugging together, which, although detachable, is otherwise reliable the half shells 17 enable.

Furthermore, the adapter ring 16 a total of four breakthroughs 27 on. For reasons of injection molding in terms of the simplest possible shape, these openings are essentially in the same circumferential areas as the lugs 18 , Again, the arrangement is such that a complete breakthrough 27 each in the plane of symmetry E of each half shell 17 is arranged and close to the parting line 20 two "half breakthroughs" 27 ' become a breakthrough 27 complete if the two half shells 17 are assembled into a ring.

How out 4 the breakthroughs are visible 27 or the half breakthroughs 27 ' in an area between the noses 18 , and the smaller outer flange 21 ,

Finally in 3 another hole 28 to be seen as a completely rimmed hole 28 in the larger flange 22 represents and as an edge recess on the outer circumference of one of the lugs 18 , The hole arrangement serves when with the hole 12 in the second pipe section 10 ( 1 and 2 ) brought into line, for engagement or penetration of a safety bolt 31 (see other figures), which is used in the operating position of the pipe connection the adapter ring 16 or an adapter ring half-shell 17 opposite the second pipe section 10 to keep it from rotating.

How out 4 the adapter ring also shows 16 an inner circumferential groove 32 with a conical groove base 33 so the inside diameter of the groove 32 from the side of the smaller flange 21 to the side of the larger flange 22 decreases continuously.

Referring now to 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 piece of pipe 34 - which is not apparent from the drawing - provided that he has four lugs protruding radially outwards at regular circumferential intervals 35 has, as is the case for example with a casing pipe of a hydrant. It is also assumed that the first piece of pipe 34 can be primarily a cast iron pipe body.

How 6 shows, store the two adapter ring half shells 17 like this on the first piece of pipe 34 that its noses 35 in the breakthroughs 27 can intervene. This is achieved in a simple manner in that the two adapter ring half-shells 17 radially from the outside in a corresponding axial assignment to the jacket of the first pipe section 34 be put on. The breakthroughs are preferred 27 especially dimensioned in its circumferential direction so that it fits the noses with a certain interference 35 are postponed what the liability of the relevant half-shell 17 on the second pipe section 34 favored.

To make one in 6 The pipe connection shown is that with the adapter ring half-shells 17 provided first pipe section 34 axially with the second, sleeve-like pipe section 10 first coupled by axially pushing each other in such a way that the lugs of the adapter ring half-shells are first 17 and recesses of the second pipe section 10 face. The pipe sections are then in the axial end position 34 and 10 rotated relative to each other, in the case of four lugs by 45 °, so that the lugs of the adapter ring half-shells 17 behind the lugs of the second pipe section 10 to grab. This end position is limited by the rotation stop mentioned above by the stop of a nose 18 the adapter ring 16 to one in the hole 11 (S. 1 ) plug or pin (not shown). The holes are in this end position 28 and 29 in line, so that now the axial locking bolt 31 can be inserted. Around the safety bolt 31 to be able to pull it out again in a simple manner if necessary, this has a transverse bore 36 to attach a tool or to attach a towing eye.

The beginning based on 4 described flanges 21 and 22 explained circumferential grooves 23 and 24 outsource them 6 visible O-ring seals 37 and 38 , Two more seals 39 and 40 the device are in 6 located, of which the seal 39 is a known under the name Tyton ring fluid sealing ring, which in an adapted inner circumferential groove 41 of the second pipe section 10 is recorded while the outer sealing ring 40 is an O-ring in an end circumferential groove 42 from the adapter ring half shells 17 formed adapter sealing rings 16 outsourced.

If the pipe connection is under internal pressure or other mechanical forces occur, the two pipe sections 10 and 34 trying to pull apart are the adapter ring half shells 17 inclined to relate to itself within the sleeve 6 to move to the left. In this regard, additional force support is in a central axial area of the adapter ring half-shells 17 and the first piece of pipe 10 a pair of bevels 43 / 44 provided, which is approximately in the order of 10 ° to the longitudinal axis L of the device.

As described above, the adapter ring has 16 , the breakthroughs 27 axially upstream, the additional inner circumferential groove 32 on. This has for those based on the 6 described pipe connection type by means of bayonet locking is of no importance, but can be used for alternative pipe connections, especially for first pipe sections 45 use with a particularly smooth coat. This shows the 7 to 9 in different embodiments.

In 7 be the first piece of pipe 45 at for example a smooth-walled steel tube. In this case it is in the inner circumferential groove 32 one with an adapted conical surface 46 provided grip ring 47 arranged.

The grip ring 47 is provided on the inside with elements that promote static friction, for example with a layer of corundum or with a vulcanized inner ring, as can be seen. Otherwise, the grip ring 47 slotted at a circumferential point so that it can be inserted into the annular space while temporarily reducing the diameter. The grip ring moves due to the conical pairing of the sliding surfaces 47 in the groove 32 the adapter ring 16 in terms of 7 to the left if tensile forces or internal pressure on the grip ring 47 act. At the same time, its diameter is reduced. So the greater these forces are, the tighter the grip ring grips 47 into the jacket surface of the first pipe section 45 , A pipe connection secured against separation in this regard is, for example, in DE 37 36 587 A1 shown.

8th shows one with 7 comparable tensile pipe connection, but with a different grip ring 48 , This grip ring 48 , which in detail in DE 198 13 762 C1 is particularly suitable for first pipe sections made of plastic such as polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP) or the like 49 , It should be noted here that the grip ring 48 with an outer support ring 50 is provided on the individual clamping bodies spaced apart from one another in the circumferential direction 51 are molded. These sprags 51 are opposite the support ring 50 essentially also radially movable, so that they easily into the inner circumferential groove 32 the adapter ring 16 can be introduced. A circumferential face flange 52 the support ring 50 lies in an end face inner circumferential groove 53 the adapter ring 16 , With the help of screws in this embodiment 54 realized impression device, the retaining ring can be preloaded. In terms of 8th It then shifts to the left in the axial direction and can thus already on the outer jacket of the first pipe section 49 grip before axial tensile forces take effect, which further increase this radial contact pressure of the grip ring segments.

9 shows a third tensile pipe connection with one in the groove 32 the adapter ring 16 stored grip ring 55 , the inner circumference, for example, a layer increasing static friction 56 made of corundum.

The inner diameter of the auxiliary assembly ring 57 is smaller than the inside diameter of the unloaded grip ring 55 so that the first piece of pipe 58 without rubbing or rubbing contact with the grip ring 55 can be inserted. Only after inserting the first piece of pipe 58 it becomes the grip ring 55 Removed mounting auxiliary ring removed again, so that then the grip ring 55 due to its reduction in diameter on the jacket of the first pipe section 58 can grab. Here, too, the inclined surface pairing serves to increase the diameter and thus increase the clamping force of the grip ring 55 when tensile forces occur. Such a grip ring arrangement with the mediation of an auxiliary assembly ring 57 is in EP 0 690 257 B1 described in detail.

What the use of a self-contained one-piece adapter ring 16 or its division into two half shells 17 concerns, it should be noted that when executing after 6 , the first pipe section 34 with fixed, radially outward lugs 35 is provided, the adapter ring can not be formed in one piece. So here come the half shells in any case 17 to use.

In the other exemplary embodiments described, a one-piece and one-piece adapter ring can be used 16 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 recesses and protruding noses therein can cause problems with undercuts in the tool.

Nevertheless, can also in the embodiments of the 7 to 9 Adapter ring half shells 17 be used. 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 is - as in the 9 to 11 shown - a bandage 59 provided that the outer circumferential flange in the illustrated embodiment 22 the adapter ring half shells 17 includes. With the bandage 59 it can be a steel ring, as in 9 recognizable, in a circumferential step of the flange 22 is integrated, on the inside, so that the flange 22 outside the bandage 59 still covered.

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

Claims (19)

Device for connecting a first piece of pipe ( 34 ) with a second piece of pipe ( 10 ) by means of a bayonet lock 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 tensile, marked through an adapter ring ( 16 ) with breakthroughs ( 18 ) for engaging noses ( 35 ) of the first pipe section ( 34 ) is provided and on the other hand radially projecting lugs ( 18 ) that engages in recesses ( 14 ) as part of the bayonet lock arrangement of the second pipe section ( 10 ) serve and that an anti-rotation device is provided that the second pipe section ( 10 ) and the adapter ring ( 16 ) keep non-rotatable in the closed position. Device according to claim 1, characterized in that the adapter ring ( 16 ) from two half shells ( 17 ) is composed. Device according to claim 1 or 2, characterized in that the half-shells ( 17 ) are identical to each other. Apparatus according to claim 2 or 3, characterized in that on the mutually facing end faces of the half-shells ( 17 Plug coupling means, in particular in the form of pins ( 26 ) and pin receptacles are formed around the half shells ( 17 ) hold together. 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. Device according to one of claims 2 to 5, characterized in that the half-shells ( 17 ) are obtained by separating a ring body produced in one piece. Device according to one of the preceding claims, characterized in that the lugs ( 18 ) and the breakthroughs ( 27 ) on the adapter ring ( 16 ) are each arranged in the same peripheral areas. Device according to one of the preceding claims, characterized in that the parting planes of the adapter ring ( 16 ) or the half shells ( 17 ) run essentially centrally through lugs and openings. Device according to claim 1, characterized in that the anti-rotation device comprises a bolt ( 31 ) which, in the closed position of the device, at least partially in each case in the adapter ring ( 16 ) and in the second pipe section ( 10 ) intervenes. Apparatus according to claim 9, characterized in that the bolt ( 31 ) is arranged essentially parallel to the longitudinal axis (L) of the device and the adapter ring ( 16 ) and / or the second pipe section ( 10 ) penetrates at least partially axially. Device according to one of the preceding claims, characterized in that in the inner surface of the adapter ring ( 16 ), the breakthroughs ( 27 ) axially upstream, an annular receiving chamber with itself in the direction from the end of the first pipe section ( 10 ) tapering inner diameter for a grip ring ( 47 ; 48 ; 55 ) is incorporated. Device according to claim 11, characterized in that the adapter ring ( 16 ) an annular gap in its axially outer end region ( 30 ) between itself and the jacket of the first pipe section ( 49 ; 58 ) trains. Device according to claim 11 or 12, characterized in that the adapter ring ( 16 ) in its axially facing outer end face an inner circumferential groove ( 42 ) trains. Device according to one of the preceding claims, characterized in that the adapter ring ( 16 ) an annular flange at or near its axial ends ( 21 . 22 ) with outer circumferential groove ( 23 . 24 ) for receiving a sealing ring such as an O-ring. Device according to one of the preceding claims, characterized in that the second pipe section ( 10 ) at least one rotation limit stop for a nose ( 18 ) of the adapter ring ( 16 ) having. Device according to one of the preceding claims, characterized in that the second pipe section ( 10 ) a pipe sleeve made of thermoplastic is with a rear pipe section ( 10a ) for welding a plastic pipe. 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 cuff encircling this. Apparatus according to claim 17, characterized in that the sleeve the outer flange ( 22 ) of the adapter ring ( 16 ) embraces. Apparatus according to claim 17 or 18, characterized in that the sleeve on the outside of the second pipe section ( 10 ) is spread.