DE112006002175B4 - Corrugated pipe - Google Patents

Abstract

Torsion-free corrugated pipe or corrugated hose line, containing a corrugated pipe (1) and at least one connection unit, consisting of an inner sleeve (4) and an outer component (11), the inner sleeve (4) after a tight tightening of the connection formed with the corresponding line connection remains rotatable, the corrugated tube (1) being pressure-tightly connected to the inner sleeve (4) by a welded or soldered connection and the end face (2) of the corrugated tube (1) being aligned coaxially with the end face (3) of the inner sleeve (4), the inner sleeve (4) has on its outside (8) a groove (9) for receiving a snap ring (10), the inner sleeve (4) on its outside (8) has a groove (13) for receiving a sealing ring (14) has, the outer component (11) on the inside (15) of its bore (16) has a groove (12) which receives the snap ring (10), inner sleeve (4) and outer component (11) through the grooves (9 ; 12) and the snap ring (10) in the axial direction f are fixed, characterized in that the corrugated tube (1) and the inner sleeve (4) are firmly and directly connected to one another by the welded or soldered connection and the connection point between the corrugated tube (1) and the inner sleeve (4) is covered by a sleeve (6) , the inner sleeve (4) on its outer side (8) has a groove (18) for receiving an intumescent sealing element (17) and the same is arranged therein, the intumescent sealing element (17) being used to provide an emergency seal which triggers when the temperature rises.

Description

The invention relates to corrugated pipelines and corrugated hoses with connectors for connecting between cable strings and assemblies or between assemblies.

The advantages of corrugated pipes made of metal, such as low weight and high pressure resistance, are known. Also known is the fact that corrugated pipes with the conventional mechanical connection components are difficult to connect to adjacent assemblies. It is also known that corrugated pipes are subject to torsion due to their design. For this reason, material fatigue and subsequent destruction of the corrugated pipes or corrugated hoses must be expected in the event of permanent torsional stress due to the installation conditions. If corrugated pipes are used in facilities with high safety requirements, permanent torsional stress must be excluded.

There are already proposals for connection solutions that allow the reduction of any torsional stress that may have arisen in a connection that has been established.

According to US 4,437,691 A it should be possible to process a guide component that is form-compatible with the wall profile in connection with an elastic sealing ring. The corrugated tube in the guide component can remain torsion-free at least until the connection is finally tightened, but is tightened when tightened.

To US 4,630,850 A an analog connection with a flat sealing ring should be possible.

According to a suggestion in EP 0 939 265 A2 a sealing ring is intended to seal the corrugated pipe to the connection component, while a flanged edge provides axial securing by engaging in a corrugation trough of the corrugated pipe. The corrugated tube connected in this way to a connection piece can be axially compressed and then can also perform a rotary movement to a limited extent. If the corrugated pipe is permanently compressed, the tightness of the connection is lost.

The solution works in the same way DE 199 48 007 A1 , where an additional intumescent component is provided. If excessive temperatures occur during the operation of such a line, the intumescent sealing element should swell. The small wall thickness of the corrugated pipe leads to deformation, which is why the solution described does not remain sealed.

As mentioned above, however, corrugated pipes are axially compressible due to their elastic formability in these connection forms. The accompanying change in shape can lead to the loss of the sealing effect even with intumescent sealing elements, since these usually have no elasticity after swelling. Such connections can therefore not be used in applications with high security requirements, such as in gas supply networks.

According to a proposal in US 2004 / 02 12th 191 A1 a connection should be made so that it can remain rotatable after tightening. For this purpose, an inner sleeve is first firmly connected to the end of a corrugated tube or a wetish tube. The inner sleeve is connected to a slipped bushing using a snap ring lock. An O-ring seal is provided in the jacket area of the inner sleeve.

A torsion-free connection is possible with this connection. However, in the event of exposure to high temperatures, such as a fire, the O-ring seal will fail and the connection will leak. If flammable liquids or gases are transported in the pipe system, a possible source of fire receives additional food.

In DE 195 16 147 A1 describes a welded connection between the end of a corrugated tube or hose and a sleeve-shaped component.

It is therefore an object of the invention to develop a connection for corrugated pipes or corrugated hoses corresponding to that described in US 2004/02 12 191 A1 so that it has additional protection to ensure tightness in the event of exposure to high temperatures while maintaining the freedom from torsion during normal operation so that it can be used in piping systems that carry flammable liquids or gases.

The essence of the invention results from the features of the claims for protection, the description and the exemplary embodiments. Exemplary embodiments and drawings represent preferred embodiments on the filing date and do not limit the invention.

The corrugated pipe according to the invention consists of the components according to the preamble of claim 1 and the configurations according to the features of the characterizing part of the same. The sub-claims describe further preferred forms of the same.

If the term corrugated pipe is used in the following description, this applies in the same way also for embodiments referred to as corrugated hoses. The corrugated pipes described preferably relate to structural units produced using metallic corrugated pipes.

The invention initially assumes that a corrugated tube is only installed torsion-free if it can still perform a rotary movement after the connection has been firmly tightened. According to the invention, this is achieved by means of a connecting piece, the inner sleeve of which is firmly and pressure-tightly connected to the corrugated tube, while the outer component or an outer structural unit is rotatably arranged on the inner sleeve and is sealed off from it. The seal is made between the inner sleeve and the outer component with the help of sealing elements.

According to the invention, in addition to the existing sealing elements, at least one intumescent seal is provided, so that an emergency seal is ensured if the connection is overheated.

The corrugated pipes equipped according to the invention can be designed for connection to all known fixed or detachable connections. All that is required is an adaptation of the geometry of the connecting pieces, in particular the geometry of the outer component or the outer structural unit.

A section of a corrugated pipe is machined at the end so that there is an approximately right-angled termination. The corrugated pipe end and an inner sleeve are aligned coaxially to one another and firmly connected to one another. The fixed connection can be made in any way, provided that the result is a tight connection. According to the invention, this is done by a welding or soldering process.

In the embodiment according to the invention, the connection point is covered by a sleeve which is pushed over and protected against bending stress. The sleeve pushed over can be firmly connected to the inner sleeve, whereby positive connections are just as suitable as welded, soldered or adhesive connections.

If the corrugated pipe is covered by a protective hose or braiding, the sleeve can also pick up and cover the end of the protective hose.

The inner sleeve of the connecting piece has at least one annular groove on its outside for receiving an elastic sealing element. A round ring is preferably used here.

Another ring groove receives an intumescent sealing element. This sealing element is not involved in the sealing function during normal use of the corrugated pipe. However, if the intumescent material is elastic in the normal state, it can also fulfill sealing perforations.

The intumescent component can be of any type, provided that it has a fixed geometry in normal use, does not use up and, in use, increases its volume by at least a multiple of the initial volume. In this way, intumescent components made from mixtures that are elastic in the initial state can be used, as can blanks from semi-finished products or pastes that solidify in the groove after insertion.

It is possible according to the invention to arrange the intumescent component before or after the round ring. The only requirement is that a secure (emergency) seal is achieved if the ring is lost.

The intumescent component can also consist of several parts that completely or partially fill the groove.

The inner sleeve has means on its outer jacket which, in conjunction with corresponding means in the bore of the outer component or an outer structural unit, enable the same to be axially fixed or guided. In the preferred embodiment, the inner sleeve has a groove for receiving a locking ring.

An outer component or an assembly is pushed over the inner sleeve, the outer diameter of the inner sleeve and the bore diameter of the outer component being paired with one another with little play. In the bore of the outer component there is also a groove outside the sealing area, which corresponds in shape, dimensions and position to the groove of the inner sleeve.

The retaining ring is preferably a snap ring, but can also be filled in by a wire which fills the groove and is shot in. It is possible to use components with the same effect, provided that an axial securing and at the same time a rotational movement is ensured between the inner sleeve and the external component.

Another embodiment of the connecting piece is that the inner sleeve has only one groove for receiving an elastic sealing element. A sealing element made of intumescent material is arranged on the end face of the inner sleeve and in the axial direction by an L-shaped ring with a protruding into the bore Collar enclosed. This embodiment of the connection is used in particular when the intumescent component is not elastic and not pasty, but is available as a preformed pressed body.

In the generally preferred embodiment of the corrugated pipelines, one end of the corrugated pipeline is firmly connected to a connection component, while the other end in each case has the connection pieces according to the invention which enable rotation. This arrangement is sufficient to reduce any torsional stresses. It is also possible to design both ends of the corrugated tube with the connecting pieces according to the invention.

The preferred design of the connecting piece has an internal thread on the connection side, with which it is tightly screwed against a connection piece with a conical thread, for example a so-called RP thread.

Another design uses a sleeve that has a shape that is compatible on the end face with the opposite connecting piece or bore, while on its outer diameter it guides a union nut with the help of a collar present there, which is used to fasten this connection. A loose flange or flange parts can also be used instead of the union nut.

If the corrugated pipe according to the invention is connected, the corrugated pipe with the inner sleeves attached to it forms a rigid structural unit. The connection to the corresponding line connections is then established with the aid of the pushed-on components or assemblies. The sleeve pushed over can be provided with a threaded connector, form ball or cone bushings, form flange connections or be designed in the manner of the known quick-release couplings.

If the corrugated pipeline described above is exposed to excessive temperatures in the area of one or both connection pieces and there is a risk that the sealing element used loses its effectiveness, the intumescent element comes into effect and the sealing of the affected connection piece or the pipe is retained. The response temperature of the intumescent component can be selected so that swelling is reliably avoided in the operating temperature range, while the effect sets in in good time before a lasting change in the material properties of the elastic sealing element.

The corrugated pipe according to the invention can also be designed in such a way that a connection component of a conventional type is inserted at one line end, while the second connection end is designed in the manner described above. If a corrugated pipeline designed in this way is first attached to the non-rotatable connecting part and then the rotatable connecting part is connected, freedom from torsion can also be ensured in this way.

• 1 - eine Schnittdarstellung eines Anschlussstückes mit einem elastischen intumeszierenden Dichtelement;
• 2 - eine Schnittdarstellung eines Anschlussteils mit einem nichtelastischen intumeszierenden Dichtelement;
• 3 - eine Schnittdarstellung eines Anschlussstückes mit einem Einschraubende.

The invention and its configuration will be described in more detail with reference to the following exemplary embodiments and drawings. It shows:

• 1 - A sectional view of a connector with an elastic intumescent sealing element;
• 2nd - A sectional view of a connector with a non-elastic intumescent sealing element;
• 3rd - A sectional view of a connector with a screw end.

A corrugated pipe ( 1 ) is on its face ( 2nd ) to the front ( 3rd ) an inner sleeve ( 4th ) coaxially aligned. Then both components are soldered or welded ( 5 ) firmly bonded together. One over the solder or weld ( 5 ) pushed cuff ( 6 ) secures them against possible bending loads. If the corrugated pipe ( 1 ) additionally with a protective hose or braiding ( 7 ), it can also be attached through the cuff ( 6 ) are covered.

The inner sleeve ( 4th ) has on the outside ( 8th ) a groove ( 9 ) to hold a snap ring ( 10th ). An outer component ( 11 ) also has a groove ( 12th ) for axial fixation in relation to the inner sleeve ( 4th ). A groove ( 13 ) in the inner sleeve ( 4th ) takes a sealing ring ( 14 ) on. It seals against the inside ( 15 ) the bore ( 16 ) of the outer component ( 11 ).

An intumescent sealing element ( 17th ) lies in a groove ( 18th ). It can also be an elastic, profiled sealing element, as well as a pasty material that is filled to fill the joints and is located in the groove ( 18th ) solidified.

The outer component ( 11 ) is on its connection side ( 19th ) with a sealing cone ( 20th ), this form of connection is only shown as an example. On a bundle ( 21 ) is a union nut ( 22 ) guided and serves to establish the fixed connection. A rear cylindrical approach ( 23 ) has at its end ( 24th ) an internal recess ( 25th ) into which the cuff ( 6 ) protrudes.

In another embodiment, which is particularly suitable for the use of solid intumescent sealing elements, a shortened one is used inner sleeve ( 26 ) used. A hard intumescent sealing element ( 27 ) is on a ring ( 28 ) with a concentrically formed collar ( 29 ) postponed. The collar ( 29 ) protrudes into the hole ( 30th ) the inner sleeve ( 26 ).

A further embodiment consists in that the arrangement described above instead of the outer component with a union nut is a molded part ( 31 ) with threaded connector on the connection side ( 32 ) used.

Another embodiment uses a connector in which a corrugated pipe ( 33 ) with an inner sleeve ( 34 ) by a weld or solder seam ( 35 ) is firmly and pressure-tight connected. The inner sleeve ( 34 ) has on its outer surface ( 36 ) a groove ( 37 ) that have a round ring ( 38 ) and against the inside ( 39 ) of an outer component ( 40 ) seals. Furthermore, on the outer surface ( 36 ) the inner sleeve ( 34 ) another groove ( 41 ) that are associated with a groove ( 42 ) in the outer component ( 40 ) the space to hold a snap ring ( 43 ) forms. In the outer surface ( 36 ) the inner sleeve ( 34 ), is also a groove ( 44 ) available, which is an intumescent component ( 45 ) records. The groove ( 44 ) there is a groove opposite ( 46 ) in the outer component ( 40 ). With the help of a thread ( 47 ) in the outer component ( 40 ) the connector is connected to a threaded counterpart, whereby the sealing in the thread ( 47 ) he follows. The corrugated tube ( 33 ) and inner sleeve ( 34 ) the existing unit is not clamped and can be in the outer component ( 40 ) turn even after a fixed connection.

The invention thus has the advantage that the prerequisite is created for installing corrugated pipelines free of torsional stresses, wherein any torsion which may arise during installation is reduced by rotation due to the possibility of the corrugated pipe rotating in the respective pushed-on components without loss of tightness of the pipeline. At the same time, the necessary emergency seal is ensured in the event of extreme thermal stress by means of an additional intumescent component. Another advantage is that almost any known type of connection can be made for the corrugated pipes according to the invention.

Reference list

1

Corrugated pipe

2nd

Face d. Corrugated pipe [1]

3rd

Face

4th

Inner sleeve

5

Weld or solder seam

6

cuff

7

Braiding

8th

Outside d. inner sleeve [4]

9

Groove

10th

Snap ring

11

Outer component

12th

Groove

13

Groove

14

Sealing ring

15

Inside d. Drilling [16]

16

drilling

17th

Intumesz. Sealing element

18th

Groove

19th

Connection side

20th

Sealing cone

21

Federation

22

Cap nut

23

Cylinder. approach

24th

End on the connection side

25th

Recess

26

Inner sleeve

27

Intumesz. Sealing element (hard)

28

L-shaped ring

29

collar

30th

drilling

31

Molding

32

Threaded connector

33

Corrugated pipe

34

inner sleeve

35

Weld and / or solder seam

36

Lateral surface

37

Groove

38

elastic sealing element

39

Inside d. outer component [40]

40

outer component

41

Groove

42

Groove

43

Snap ring

44

intumescent element

45

intumescent element

46

Groove

47

thread

Claims (6)

Torsion-free corrugated tube or corrugated hose line, containing a corrugated tube (1) and at least one connection unit, consisting of an inner sleeve (4) and an outer component (11), the inner sleeve (4) having been tightened with the corresponding line connection Connection remains rotatable, the corrugated tube (1) being connected to the inner sleeve (4) in a pressure-tight manner by a welded or soldered connection and the end face (2) of the corrugated tube (1) being coaxial with the end face (3) of the inner sleeve (4) is aligned, the inner sleeve (4) has on its outside (8) a groove (9) for receiving a snap ring (10), the inner sleeve (4) on its outside (8) has a groove (13) for receiving a sealing ring (14), the outer component (11) on the inside (15) of its bore (16) has a groove (12) which receives the snap ring (10), inner sleeve (4) and outer component (11) through the Grooves (9; 12) and the snap ring (10) in axial R are fixed, characterized in that the corrugated tube (1) and the inner sleeve (4) are firmly and directly connected to one another by the welded or soldered connection and the connection point between the corrugated tube (1) and the inner sleeve (4) by a sleeve (6) is covered, the inner sleeve (4) on its outside (8) has a groove (18) for receiving an intumescent sealing element (17) and is arranged therein, the intumescent sealing element (17) being used to provide an emergency seal which triggers when the temperature rises . Torsion-free corrugated pipe or corrugated hose line containing a corrugated pipe (1) and at least one connection unit, consisting of an inner sleeve (26) and an outer component (11), the inner sleeve (26) after tightening the connection formed with the corresponding line connection remains rotatable, the corrugated tube (1) being connected to the inner sleeve (26) in a pressure-tight manner by a welded or soldered connection and the end face (2) of the corrugated tube (1) being aligned coaxially with the end face (3) of the inner sleeve (26) is, corrugated tube (1) and inner sleeve (26) are connected to each other, the inner sleeve (26) on its outside (8) has a groove (9) for receiving a snap ring (10), the inner sleeve (26) on it Outside (8) has a groove (13) for receiving a sealing ring (14), an outer component (11) on the inside (15) of its bore (16) has a groove (12) that receives the snap ring (10), inner sleeve (26) and outer construction part (11) through the grooves (9; 12) and the snap ring (10) are fixed in the axial direction, characterized in that the corrugated tube (1) and the inner sleeve (26) are firmly and directly connected to one another by the welded or soldered connection and the connection point between the corrugated tube (1) and the inner one Sleeve (26) is covered by a sleeve (6), in the bore (16) coaxial with the inner sleeve (26) a ring (28) with an L-shaped cross section, which carries a hard intumescent element (27), is arranged and with its collar (29) protrudes into the bore (30) of the inner sleeve (26), the intumescent element (27) providing an emergency seal which triggers when the temperature rises. Corrugated pipe according to one of the Claims 1 or 2nd , characterized in that the outer component (11) with a collar (21) guides a union nut (22). Corrugated pipe according to one of the Claims 1 or 2nd , characterized in that a molded part (31) with a threaded connector is arranged on the inner sleeve (4; 26). Corrugated pipe according to one of the Claims 1 or 2nd , characterized in that a molded part with locking elements is arranged on the inner sleeve (4; 26). Corrugated pipe according to one of the Claims 1 to 4th , characterized in that a line end of the same has a non-rotatable connection element.

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