Pipe coupling with extended clamping range

Abstract

The invention relates to a pipe coupling (10) for connecting two pipes (34), or a pipe clip (10) for sealing a faulty pipe (34), in particular pipes (34) with a diameter of greater than 40 mm or greater than 80 mm or 200 mm. This comprises a first and at least one second flexible band clip segment (20) that can be clamped around the pipe / s (34), a first and at least one second clamping device (22a, 22b) around the perimeter of the pipe coupling (10) for connecting the band clip segment (20) and for reducing an internal diameter of the pipe coupling (10), as well as a sealing collar (30) or sealing insert (30) with a longitudinal extension (44) between two ends (47) of the sealing collar (30) which can be placed around the pipe / s (34) and which can be placed under pressure by means of the clamping device (22a, 22b) in order to generate radial clamping pressure forces on the pipe / s (34). According to the invention, the sealing collar (30) is formed with at least one separation point (41, 41) provided in the region of at least one end (47) of the sealing collar (30), where the length (44) of the sealing collar (30) can be reduced.

Description

[0001] Pipe coupling with extended clamping range

[0002] The invention relates to a pipe coupling for connecting two pipes, in particular a repair pipe coupling or a pipe clamp for sealing a defective pipe, according to the preamble of claim 1, as well as a corresponding method for improving the sealing effect of pipe couplings, especially with an extended clamping range.

[0003] Generic pipe couplings within the meaning of the present invention are shown, for example, in WO 02 / 086 370, US 6 328 352, WO 09 / 044 328 or PCT / IB2020 / 062126. These are specifically designed for connecting or repairing pipes that are subject to high pressures, temperatures, etc. and are often used in harsh environments. Accordingly, these pipe couplings are designed with a flexible clamp band that can be tensioned around the pipes to be connected or around the pipe to be repaired. This flexible clamp band is made of various materials, preferably corrosion-resistant metal. When the pipe clamp is installed around the pipe or around the pipe ends, a tensioning device reduces the inner diameter of the clamp band, and a sealing insert or sealing sleeve on an inner side of the clamp band is pressurized by means of the tensioning device.By clamping the pipe coupling, radial clamping forces are generated on the pipe(s), pressurizing the sealing insert and pressing it onto the leak in the pipe or onto both pipe ends. This creates an external seal and / or connects the pipes. The term "pipe coupling" can also refer to a pipe coupling designed to connect two pipes or other tubular elements such as nozzles, sleeves, etc., or to a pipe clamp designed to seal a defective tubular element.

[0004] The areas of the pipe(s) or pipe ends enclosed by the pipe coupling are usually smooth, meaning they do not inherently have any beads, bulges, or the like on their circumference intended for connection, as would be the case with completely different coupling types such as those in FR 1221348, whose technical functionality, due to the different geometric structure of the pipe end, bears no relation to the couplings according to the invention. In order to achieve a good and reliable sealing effect, the selection and design of the sealing insert is essential. In order to achieve a secure sealing effect, such sealing inserts were originally manufactured in one piece. However, this is usually not possible, especially with repair couplings, since closed sealing insert rings cannot be pulled onto laid pipes without causing damage. Couplings of this type therefore have a sealing insert that is placed around the pipe.In contrast to other specialist areas such as soundproofing inserts or fire protection sleeves, the sealing inserts or sealing sleeves in the present field of pipe connection or repair must always provide a reliable seal against the medium in the pipe. Pipe couplings such as those in WO 01 / 81814, which are specifically designed for fire resistance, can also feature a flame-retardant insert, which specifically solves technical problems at high temperatures, but has no influence on the sealing effect, especially during normal operation. If at all, such flame-retardant inserts only function when they intumescently foam and insulate. In this case, another metal layer, usually the coupling housing, is arranged between the flame-retardant insert and the seal – the flame protection is therefore attached externally.

[0005] Pipe couplings according to the invention can have special, sometimes highly sophisticated and / or complexly structured shapes, which are sometimes absolutely necessary in these pipe couplings to achieve the desired sealing properties. The pipe couplings are each provided for a defined pipe diameter, i.e., with a clamping range of their clamping device that can cover a defined range of pipe diameters. For example, with an application range of 110 mm to 130 mm pipe diameter – i.e., a clamping range with a diameter of 110 mm as an example of a typical value. Accordingly, a large number of different couplings must be designed, produced, and kept in stock to cover a wide variety of applications.

[0006] The object of the present invention is therefore to create a device and to provide a method which does not have the aforementioned disadvantages or which minimizes them. In particular, the effort required for specific design, production and storage of different pipe couplings and pipe coupling variants is to be reduced. In particular, an improved pipe coupling is to be provided which is reliable and has a wide range of uses, and in particular can be used more universally over a larger clamping range of pipes. A special object is to always provide a good and reliable sealing effect and to maintain or improve this compared to known couplings. In other words, a possible object can also be seen in providing a reliably sealing pipe coupling in which a wide range of pipe diameters can be covered or connected with one and the same pipe coupling.However, this should not impair the sealing effect, nor should assembly or handling be made more difficult or require complex interventions during assembly.

[0007] The objects are achieved by the features of the independent claim. Advantageous further developments are set forth in the figures and in the dependent patent claims.

[0008] According to the invention, a pipe coupling for connecting two pipes or a repair or pipe clamp for sealing a defective pipe is provided. The terms pipe coupling and repair or pipe clamp are used synonymously below unless otherwise indicated. This pipe coupling or pipe clamp is specifically designed for larger pipes, i.e. pipes with a diameter greater than approximately 40 mm or greater than 80 mm or greater than 200 mm, particularly since some of the advantages of the invention become more dominant with increasing diameter and larger clamping ranges of several centimeters are more of interest or only possible with such larger nominal diameters. The pipes for which the pipe coupling is designed are preferably general, externally flat, unprofiled pipes, without beads or grooves specially designed for connecting the pipes.A pipe coupling according to the invention comprises at least a first and at least a second flexible clamp band segment that can be clamped around the defective pipe or the pipes to be connected. In other words, its housing is constructed in at least two or more parts, in particular segmented with partially overlapping clamp band segments, for example, made of a flexible and preferably corrosion-resistant metal. These can be used to clamp the pipe around its circumference. With more than two clamp band segments or clamping devices along the circumference, terms such as "halves" etc. are to be interpreted analogously.

[0009] The pipe coupling further comprises a first and at least one second clamping device along the circumference of the pipe coupling. These clamping devices connect the clamp band segments to one another, which can be clamped and, when clamped, cause a reduction in the inner diameter of the pipe coupling. This reduction in the inner diameter (and the clamp band segment dimensions) defines a clamping range of the pipe coupling, within which the pipe diameters for which this coupling can be used must lie. With two or more clamping devices along the circumference, a correspondingly larger clamping range can be achieved than with a single clamping device. One of these clamping devices can, for example, be formed with at least one - preferably two or possibly more - clamping screws arranged next to one another in the axial direction of the pipe.The clamping screws can be arranged with their screw axes substantially tangential to the pipe circumference. These allow the clamp band segments to be joined together to form a closed clamp band, and the clamp band can be clamped, for example, similar to the principle of a hinged bolt clamp. Preferably, in addition to other known clamping devices, approximately evenly distributed screws can be provided along the circumference of the clamp band between bolts located in each of the clamp band segments, with one of the bolts being formed with an internal thread or having a receptacle for such an internal thread.

[0010] The pipe coupling further comprises a sealing sleeve or sealing insert which can be placed around the defective pipe or the pipes to be connected. In this case, a longitudinal extent of the sealing sleeve between the two open ends of the sealing sleeve is placed around the pipe circumference, preferably in a single layer and with the ends butt-jointed. With such an open sealing sleeve and the at least two clamp band segments, the pipe coupling can be easily opened up using at least one open or separate clamping device. In this opened up state, it can then be placed around a pipe or a pipe connection, whereupon the thus installed pipe coupling can be sealed by closing or clamping the open clamping device, preferably with more than one clamping device being actuated along the pipe circumference. In the installed state of the pipe coupling, the sealing sleeve can be pressurized or released by means of the clamping device.The sealing sleeve can be clamped in a fluid-tight manner using the clamping device under or within the clamp band. Specifically, radial clamping and compressive forces can be generated on the sealing sleeve between the clamp band and the pipe(s). This pressing also presses the abutting ends of the sealing sleeve against each other and seals them – in particular, the pressing also occurs essentially tangentially to the pipe or approximately orthogonally to the surfaces of the ends of the sealing sleeve.

[0011] According to the invention, the sealing sleeve is designed with at least one provided or prepared separation point in the region of at least one end of the sealing sleeve, at which separation point the sealing sleeve can be shortened in its longitudinal extent or length by separation. Specifically, the provided separation point is provided at a defined distance from the end of the sealing sleeve, for example at a distance of 1 cm to approximately 15 cm from the end. Preferably, the provided separation point is designed such that the sealing sleeve can be completely separated thereat, preferably by hand or without tools, for example with a provided separation point in the form of a defined predetermined breaking point, for example a perforation or a non-continuous incision in the sealing sleeve.

[0012] In other words, the invention was directed at a pipe coupling such as that developed by Straub, which is now a leading standard, with a new approach to the sealing insert. With more than one clamping device along the circumference, an advantageously large clamping range can be achieved by adding together the clamping ranges. With more than one clamping device, the assembly of the pipe coupling can also be simplified, as this enables the pipe coupling to be folded open like a joint on the second clamping device, making it easier to slip the coupling around or place it around the pipe(s). Optionally, the coupling could also be opened at two clamping areas, allowing it to be fitted around the pipe in the form of several individual segments or parts. This can, for example, increase the area of ​​application or the clamping range.Specifically, according to the invention, the sealing insert is also designed with at least one designated cutting point. If the pipe diameter is at the upper end of the clamping range, the sealing insert is used as is, over its full length - the designated cutting point remains connected - and is clamped underneath the clamp band. If the pipe diameter is at the lower end of the clamping range, the sealing insert is cut at the designated cutting point and thus shortened in length by one cut-off piece. The designated cutting point is preferably designed in such a way that it can be cut by hand or without special tools. Of course, multiple cutting points can also be designed, each specifically for certain pipe diameters or pipe diameter ranges within the clamping range.

[0013] Preferably, the intended separation point is specifically designed to be separable without tools. The sealing sleeve can be shortened, particularly by hand, by a defined tear-off piece along its longitudinal extension, which is placed around the pipe along its circumference, at the designated, defined separation point. This eliminates the need for special tools for on-site adjustment. There is also no risk of injury from knives, blades, etc. A straight and / or perpendicular or parallel separation can also be ensured, thus ensuring a secure sealing joint between the (possibly newly created) ends.

[0014] Preferably, at least two separation points can be provided on the sealing sleeve, whereby according to the invention preferably 1 to 3 or a maximum of 5 separation points are provided. In particular, the separation points provided according to the invention are specifically formed in the region of the end or ends of the sealing sleeve and not distributed over the entire length of the sealing sleeve. The separation points can be located at just one of the end regions or at least one each at (at least) one end region of the sealing sleeve. With separation points at both sleeve end regions, the distances to the ends can be selected to be different for each end such that by permutation / combination they can achieve more different lengths than there are separation points. If separation points are provided at both ends, the distances between the separation points can be different, so that a more precise adaptation can be achieved, e.g.At one end the cutting points are 2 cm apart and at the other end of the sleeve the distances are 3 cm. This means that you can shorten the pipe by either 2 cm, 3 cm or 5 cm - with just two cutting points. In particular, the distances between the cutting points can be designed in a range from approximately 2 cm to 15 cm, preferably designed precisely for the various common or standard pipe diameters. Optionally, the cutting points on the sealing sleeve can each be labeled, in particular by which length it is shortened, with the remaining length and / or with an indication of the pipe diameter or clamping range for which the respective cutting point is intended. This allows simple and flexible adaptation to different diameter ranges.

[0015] Preferably, the intended separation point is formed with or in the form of a perforation in the sealing sleeve, in particular in the pipe-radial direction (= thickness) of the sealing sleeve. For example, the perforation can be formed with a row or line of at least partially or completely continuous holes or slots. These can be produced, for example, by laser, water jet cutting, punching, cutting, etc. These can be produced along or diagonally to the thickness of the sealing sleeve. With appropriate design, easy separability at the separation point, secure hold of the separation point to prevent unwanted separation, and a reliable sealing effect after the pipe coupling has been tightened can be ensured.

[0016] Alternatively or in addition to the perforation, the intended separation point can be formed with an incision or notch in the pipe-radial direction (= thickness) of the sealing sleeve, preferably on the side of the sealing sleeve facing the pipe in the assembled state. In particular, the incision is formed with a residual material thickness of approximately 0.5 mm to approximately 3 mm, or with an incision depth of at least 50% to approximately 99% of the thickness of the sealing sleeve. The exact value can depend, for example, on the material of the sealing sleeve and is preferably determined in such a way that separation or tearing at the separation point can be carried out by hand, preferably without tools, and / or unintentional separation is prevented during normal handling.This ensures easy separability at the separation point, secure hold of the separation point to prevent unwanted separation as well as a secure sealing effect after the pipe coupling has been tightened, especially since during separation a substantially smooth end face adapted to the other side is created at the separated end, which has a good sealing effect against the opposite end.

[0017] In addition to a linear, straight, or polygonal geometry, in one embodiment, the ends and the intended separation point(s) of the sealing sleeve can be formed with a non-linear geometry, preferably with a form-fitting, interlocking geometry, in particular with a puzzle pattern. This allows the ends to be joined together, which, for example, is secured against slipping.

[0018] Preferably, the separation point runs essentially parallel to an end edge of the sealing sleeve. In particular, the separation point can be designed to run at least approximately in the axial direction of the pipe, or transversely or orthogonally to the longitudinal extension of the sealing sleeve, but optionally also diagonally to the orthogonal direction and / or non-linearly between the inlet and outlet of the separation point. This allows either a simple orthogonal cut to be used to create the separation point (for example, with the same tool used to cut the sealing sleeve to length at the ends) or a more specialized geometry to counteract lateral slippage.

[0019] Preferably, at least one of the end edges and / or the separation points can also be designed with an inclination relative to the orthogonal to the flat sealing sleeve length, in particular one adapted to the pipe diameter. In other words, the separation cut or the separation point can be designed obliquely, i.e. with a defined deviation of 90° relative to the outer surface of the flatly spread out sealing sleeve. The value of such a deviation can be designed in particular to match the pipe diameter intended for this sealing sleeve or separation point, so that the end faces advantageously bear against one another during pressing - e.g. preferably over approximately the entire surface. This allows a more flat contact between the butt-fitting ends of the sealing sleeve when wrapped around the pipe, which can have a positive effect on the sealing effect.The sealing sleeve is preferably designed to be fastened to the inside of one of the clamp band segments or, in the case of the pipe coupling provided, the sealing sleeve is fastened to one of the clamp band segments. The sealing sleeve can preferably be fastened so as to protrude asymmetrically from one of the half-shells formed by the clamp band segments or can be designed for asymmetric (in particular detachable) positioning on the inside of one of the clamp band segments. This allows the sealing sleeve to be opened up to an angle of greater than 90° in order to be able to insert the pipe easily. With the asymmetry, the protruding end of the sealing sleeve can then be inserted or removed under the second clamp band segment under the clamping device which is open for assembly.be threaded so that the joint of the sealing sleeve ends lies beneath this second clamp band segment (and preferably outside the area of ​​the clamping device). In other words, in the assembled state of the pipe coupling, the sealing sleeve, which encloses the two pipe ends of the two pipes or the defective area of ​​the pipe, is preferably positioned such that the ends of the sealing sleeve are pressed together beneath one of the clamp band segments – and not in the clamping area. This creates a beneficial sealing effect at the joint of the sealing sleeve.

[0020] Preferably, the present invention is provided as a fully configured pipe coupling, meaning that the sealing sleeve is preferably already (pre-)assembled in the pipe coupling. For example, the sealing inserts do not have to be unwound from a separate endless band each time they are installed on site, then neatly cut off with parallel ends, then wrapped around the pipe, and then the clamp band is stretched over them.

[0021] In a special embodiment, several sealing insert segments can also be provided per pipe, in particular one (preferably pre-assembled) sealing insert according to the invention per clamp band segment. The joints of the sealing insert segments can preferably be arranged asymmetrically to the clamp band segments, or the joints of the sealing inserts can be offset from those of the clamp band segments. The pipe coupling, or rather its clamp band, can be symmetrical or angularly symmetrical in its circumference; in particular, the several clamp band segments can also be of the same type or of the same design, thus reducing the cost and effort involved in design, manufacturing, and warehousing.

[0022] In one embodiment, different clamp band segments of varying lengths can be provided in a modular system that can be combined with one another. These segments can then be combined ex warehouse, ex factory, or only at the site of use – adapted to the required pipe diameter in order to cover this with the combination. With appropriately designed gradations of lengths and an expanded clamping range according to the invention, a variety of pipe diameters can be covered with just a few clamp band segment models of different lengths. According to the invention, the sealing inserts, which are preferably pre-assembled in at least one of the clamp band segments, are designed with at least one provided separation point in order to be able to adapt their length to the pipe diameter.

[0023] At least one of the clamp band segments can be specially designed with at least one, in particular two, insertion lugs on the clamp band. For example, insertion lugs in the form of bevels or convex curves on the sheet metal, saddle, or inner part of the clamp band, which is firmly connected to the casing of the clamp band, e.g., by spot welding, clinching, clinching, etc. This allows for better insertion of the sealing sleeve or the other clamp band segment compared to a blunt or right-angled design, particularly reducing the risk of the sealing sleeve becoming jammed when closing the clamp band segments.

[0024] The sealing sleeve is preferably elastic or rubber-elastic, or made of a material such as EPDM, NBR, FKM, silicone, etc. For example, with a Shore A hardness in a range of approximately 50 to 90, especially with a hardness of approximately 70 Shore A. This provides a reliable sealing effect. The sealing sleeve or pipe coupling according to the invention can specifically have a width (in the pipe axial direction) of at least 100 mm or 200 mm, for example approximately 100 mm, 200 mm, 400 mm, 600 mm or optionally also dimensions in between or above. The sealing sleeve or pipe coupling according to the invention can specifically have a thickness or strength (in the pipe radial direction) of greater than 3 mm or greater than 5 mm, for example 4 mm, 8 mm, 15 mm, 20 mm or up to approximately 50 mm. In particular, specially designed lateral sealing lips of the sealing sleeve can have a greater thickness than the area between these sealing lips.Not necessarily but preferably the residual material thickness is essentially constant along the separation point, also in the area of ​​the sealing lips.

[0025] Preferably, the pipe coupling with the sealing sleeve is designed to provide a clamping range of the diameters of the pipes to be clamped of at least 15 mm, preferably 40 mm to approximately 150 mm (or possibly even more for very large pipe diameters). For example, with DN 100 to 200, in contrast to simple clamping screws with a clamping range of approximately 25 mm, a clamping range of approximately 45 mm or more can be covered with at least two clamping devices or a two-part clamp band and the sealing sleeve according to the invention. In some embodiments, the clamping range can be, for example, more than 15% to 20% of the nominal diameter.

[0026] According to the invention, the combination of at least two clamping areas along the circumference with a sealing sleeve with a separation point is particularly advantageous, since this enables reliable, tight clamping of the pipe coupling over such a wide clamping range, and the pipe coupling can be folded open for assembly so that the pipe can be inserted into the pipe coupling. Preferably, the first clamping device is designed such that it cannot be opened or creates a permanent connection between the first and second clamp band segments during assembly. The second clamping device, on the other hand, is preferably foldable or designed to provide a detachable connection between the first and second clamp band segments for assembly. The first clamping device can be foldable by at least approximately 90 degrees orIt must be hinged at least far enough for the pipe coupling to be opened sufficiently to allow it to be placed or slipped over the pipe. Optionally, the first clamping device can have a locking mechanism to prevent it from collapsing during assembly. In particular, at least the hinged clamping device can have a handle.

[0027] One aspect of the invention specifically relates to a sealing sleeve, designed for a pipe coupling or pipe clamp described here, with two open ends designed for wrapping around a pipe in a single layer, wherein the ends lie butt against one another, which is designed with at least one, preferably 1 to 5, provided separation points, which are arranged at a distance of 1 to 15 cm from the end and running parallel to the end, at which separation points the thickness of the sealing sleeve is reduced such that it can be separated without tools or by hand. For example, the sealing sleeve can also have specially designed sealing lips in the lateral edge region, which are shaped to achieve or improve a sealing effect around the entire circumference of one of the pipes or on both sides of the repair point of the pipe - especially when excess pressure is applied from the inside of the pipe to the outside.Optionally, the pipe coupling or clamp band can also be provided with a special grip element for holding or clamping the pipes.

[0028] In an analogous manner, the invention also relates to a method for improving the sealing effect of a clampable pipe coupling, for example a pipe coupling or a pipe clamp as described in this text. The method comprises at least providing a sealing insert which is designed with at least one provided cutting point at at least one end of the longitudinal or circumferential extent of the sealing insert. This cutting point is provided in such a way that the length of the sealing insert can be or is shortened at this point, in particular without tools. Accordingly, the sealing insert is preferably shortened at one of the provided cutting points if the pipe diameter is in a lower region of the clamping range of the pipe clamp. The cutting is preferably carried out by hand without tools.

[0029] The pipe coupling is then assembled by opening at least one first clamping device between two segments of a clamp band of the pipe coupling, which are connected to a second clamping device. After the opened pipe coupling is slipped over the pipe or pipe connection, the sealing sleeve, which may have been shortened as explained above, is wrapped around the pipe circumference, the end surfaces preferably butting against one another, and the clamp band is closed, with the sealing sleeve and its butt joint coming to rest beneath the clamp band. The pipe coupling is then clamped using the clamping devices, preferably to a defined force value, which is carried out in such a way that the force of the clamp band wrapping around the sealing insert presses and seals the sealing sleeve against the pipe and against itself at the butt joint.

[0030] Accordingly, the invention also relates to a method for mounting a pipe coupling on a pipe, comprising opening the pipe coupling at a first clamping device between a first and at least one second clamp band segment and unfolding the clamp band segments at a second clamping device between a first and at least one second clamp band segment. Wrapping the pipe with a sealing sleeve, preferably mounted on one of the clamp band segments - wherein, according to the invention, the sealing sleeve is cut to length or shortened, in particular torn off, at a cutting point provided or designed for this purpose in the sealing sleeve when the diameter of the pipe lies in a lower region, e.g., in the lower half, of the diameter clamping range of the pipe coupling predetermined by the clamping devices.After closing the clamp band segments around the pipe and closing the first clamping device, the sealing device between the clamp band and the pipe is pressed by actuating the clamping devices.

[0031] Further advantages, features and details of the invention will become apparent from the following description, in which embodiments of the invention are described with reference to the drawings.

[0032] The list of reference symbols, like the technical content of the patent claims and figures, is part of the disclosure. The figures are described coherently and comprehensively. Identical reference symbols indicate identical components; reference symbols with different indices indicate functionally identical or similar components.

[0033] They show:

[0034] Fig. 1 shows a first embodiment of a pipe coupling according to the invention;

[0035] Fig. 2 shows the first embodiment of a pipe coupling according to the invention in a pipe-axial partial section;

[0036] Fig. 3 shows the first embodiment of a pipe coupling according to the invention in a further view;

[0037] Fig. 4a and Fig. 4b views of an embodiment of a pipe coupling sealing sleeve according to the invention;

[0038] Fig. 5a to Fig. 5f details, options and embodiments of a pipe coupling sealing sleeve according to the invention;

[0039] Fig. 6a and Fig. 6b detailed views of embodiments of clamp band segments according to the invention;

[0040] Fig. 7a and Fig. 7b show an embodiment of a pipe coupling according to the invention on a pipe in the upper diameter range of the pipe coupling clamping range and on a pipe in the lower diameter range of the pipe coupling clamping range, respectively;

[0041] Fig. 8 is a perspective view of an embodiment of a pipe coupling according to the invention with an extended clamping range and a corresponding sealing sleeve.

[0042] Fig. 1 shows an example of a generic pipe coupling 10 for creating a fluid-tight connection between two pipes or a pipe clamp or sealing or repair coupling 10 for sealing a defective pipe. Unless specifically stated, these terms as well as pipe or pipes are used synonymously below. Since the pipes are already laid, this pipe coupling 10 is designed with a first clamping device 22a and at least one second clamping device 22b such that the pipe coupling 10 can be folded open at least far enough that the opened coupling can be placed around the pipe from the radial direction and does not have to be pushed on axially. (Radial and axial are used here in relation to the pipe.) The first clamping device 22a can be opened, shown here by the clamping screws 21a being in a threaded bolt 25 provided with an internal thread and, on the other side, in a slotted bolt 24, and being able to be folded out of the slotted bolt 24 when not under tension. The handle 75 shown can optionally be helpful for this. In the example shown, two (or more in other embodiments) clamping screws are arranged next to one another in the axial direction. These can be arranged specifically in the area of ​​the two axial ends of the coupling or in the area of ​​the sealing lips of the sealing sleeve, or in other embodiments - especially in the case of longer couplings - there can be more than two clamping screws distributed axially in order to be able to achieve even pressing over the axial length. With these clamping screws, pressure can be exerted on both pipes or the sealing sleeve during clamping.The tensioning device(s) 22 - especially those intended to open the clamp band - can also be referred to as a closure.

[0043] The second clamping device 22b has clamping screws 21b between a threaded bolt 25 and a hole bolt 29, in which the clamping screws 21b cannot be folded out. The second clamping device 22b serves as a joint to allow the two clamp band segments or coupling halves 20a and 20b to be folded open when the first clamping device 22a is open, in order to insert the pipe into the coupling 10. Preferably, the clamping devices and coupling halves form a single unit, with at least one clamping device being designed as an openable closure.

[0044] The clamp band 20 is made of a flexible metal and is constructed from two, preferably identical or similarly constructed, clamp band segments 20a, 20b. The illustrated embodiment can be divided into an outer clamp casing 26, which is connected to the clamping devices, a clamp saddle 27, which forms an axial limitation (possibly with additional gripping elements for gripping the coupling in the pipe to secure against axial displacement), and an inner housing 28, which, specifically with its saddle 27, also bridges the longitudinal slots of the clamp band in the clamping area of ​​the clamping devices 22a and 22b. These parts, especially the clamp casing 26 and the clamp inner housing 28, can be connected, for example, via a spot weld, clinch, or clinch joint 77, etc.Likewise, the clamp saddle 27 can be firmly attached to the inner housing 28 by means of a weld, solder, spot weld, clinch, or clinch joint. In the example shown, the clamp band 20a is also joined to the connection points 79 with a similar connection.

[0045] Located inside the clamp band 20 or the coupling halves 20a, 20b (especially inside the clamp inner housing 28 and clamp saddle 27) – essentially completely enclosed by the latter in the assembled state – is a sealing sleeve or sealing insert 30, which is made of an elastic or rubber-elastic sealing material and, as shown here, preferably forms at least one sealing lip in the region of each axial end. The sealing sleeve 30 has a longitudinal extension or length which is placed around the circumference of the pipe and which meets at its ends at the joint 37, in preferred embodiments with its end surfaces butting together. According to the invention, this sleeve has at least one provided separation point 41 in the region of the end(s).The intended separation point 41 is prepared in such a way that the sealing sleeve can be separated there if necessary, for example, by designing this defined separation point in such a way that a portion of the sealing sleeve can be torn off at this point. This defined separation point prepared on the sealing sleeve is preferably designed in such a way that the separation or tearing off can be performed without tools or by hand.

[0046] Fig. 2 shows the pipe coupling 10 as in Fig. 1 again in a different view (specifically in a pipe-axial partial section), in which, in addition to the elements already explained, the two pipes 34 to be connected and their joint 35 (or a pipe 34 to be repaired and the leak point 35) are also specifically shown, which is sealed by the sealing sleeve 30 of the pipe coupling 10.

[0047] Fig. 3 shows the pipe coupling 10 as in Fig. 1 in a further view, specifically in a side elevation of Fig. 2. In addition to the clearly visible elements already described, the sleeve fastening 73 of the sealing sleeve 30 in one of the clamp band segments is shown again here, which can be done with screws, rivets, etc., for example, as well as - if necessary - a corresponding counterpart 74 on the sleeve. In addition, the optional, advantageous elements are also shown, such as an anti-slip O-ring 71 on the clamping screws 21a to prevent the handle from collapsing onto the screw 21a (and possibly falling apart) of the pipe coupling 10 when the slotted bolt 24 is not tightened, or a similarly acting anti-slip clip 72 on the clamping screws 21b to prevent the second clamping device 22b from accidentally collapsing during assembly, etc.which also represent innovations in themselves.

[0048] As shown in Fig. 4a using two exemplary embodiments, the pipe coupling according to the invention can be attached to pipes of different diameters within the clamping range of the pipe coupling. This clamping range can be increased by providing at least one second clamping device along the circumference of the pipe coupling, but - especially with larger pipe diameters - this may not be sufficient to achieve simple assembly with a reliable sealing effect. According to the invention, in addition to the multiple clamping devices, the sealing sleeve 30 is also designed such that it has at least one predetermined cutting point, with which the sealing sleeve 30 can be shortened in length on the pipe coupling. The original ends 47 of the sealing sleeve 30 or those created by cutting at the cutting point each abut at the butt joint 37 in the assembled state.Specifically, the sealing sleeve 30 can be adjusted from a larger diameter 32 to a smaller diameter 33 using the provided separation point - preferably without tools. In other embodiments, adjustment to more than two diameters is also possible using more than two separation points. However, according to the invention, a gradation to a small, finite number of separation points is sufficient, e.g., a number of one to approximately five separation points, since according to the invention the sealing sleeve does not have to be adjusted precisely in length, as pressing still takes place under the clamp band. According to the invention, more than approximately five provided separation points would be possible, but in practice they make little sense and are therefore not a preferred embodiment. As a rule, 1, 2, or 3 separation points are sufficient.By crimping under the clamp band, a certain range of diameters can be covered with a single length of sealing sleeve, but this may no longer sufficiently cover the full clamping range achievable with two or more clamping devices – especially if the latter are specifically designed to expand the clamping range. Alternatively, a separation point according to the invention can improve the sealing effect and / or simplify assembly or make the sealing compression more reliable. For example, a clamping range of 104 to 145 mm with one separation point can be provided by two ranges of 125 to 145 mm without separation and of 104 to 125 mm with separation from the same pipe coupling.

[0049] Fig. 4b shows a view of an example of a flat sealing sleeve 30 of a pipe coupling according to the invention, here with a provided separation point 41 for manually separating a separation piece 40.

[0050] Fig. 5a shows an embodiment of a flat, spread-out sealing sleeve 30 according to the invention again in a top view. It shows a provided separation point 41, which forms a tear-off or severance piece 40 of the same width at a distance 42 from the end 47 of the sealing sleeve 30. This allows the sealing sleeve to be shortened from its original length 44 by the tear-off length 42 for small pipe diameters. The right-hand end 47 is thus replaced by the end 47b at the provided separation point. In another embodiment, a second separation point 41b can also be formed, so that the sealing sleeve, in addition to the basic length, can be optionally adapted to two shorter lengths for smaller diameter ranges. The second separation point can also be located at the opposite, left-hand end 47.If, for example, the right-hand separation point is 1 cm from the right end 47 and the left-hand separation point is 2 cm from the left end 47, a shortening of either 1 cm (right) or 2 cm (left) or 3 cm (left and right) can be achieved with just two separation points. In the embodiment shown, fastenings for the sealing sleeve are also provided in a clamp band segment at the edge of the area of ​​the sealing lips arranged laterally on the width 45, preferably outside the sealing surfaces themselves or outside the inner sealing area between the lateral sealing lips 31. In other embodiments, the sealing sleeve 30 can also be flat in side view and not form any specific sealing lips 31.

[0051] In the corresponding side view in Fig. 5b, an embodiment of these sealing lips 31 is again explicitly shown, as well as their thickness 56. In this side view, the dashed line also shows an embodiment of the intended separation point 41, in which the sealing sleeve is cut or scored across the entire width except for the residual material in a narrow area between the dashed line and the outer edge on the flat side.

[0052] Fig. 5c shows the sectional view BB of Fig. 5a, in which the sealing sleeve 30 and the intended separation point 41 are shown, by means of which the sealing sleeve 30 can be configured to the shortened sealing sleeve 48 by separating the separation piece 40, preferably by hand, without tools, for example by tearing it off by hand.

[0053] Fig. 5d again shows a detailed representation of an embodiment of the intended separation point 41 between the separation piece 40 and the shortened sleeve 48 from Fig. 5c. This involves a partial incision at 41, which leaves approximately 0.5 mm to 3 mm of residual material across the entire width. Depending on the sealing sleeve material, the residual material thickness 49 is selected such that manual separation - preferably without a knife - is possible, but at the same time accidental separation through normal handling is avoided.

[0054] Alternatively, or in addition to a partial incision in the thickness 46, 56 of the sealing sleeve 30, a perforation in the form of a row or line of continuous holes or slits across the entire thickness 46, 56 of the sleeve 30 can also be designed as the intended separation point. Since these holes or slits close again when the sealing sleeve is pressed, this has no negative impact on the seal.

[0055] The intended separation point 41 preferably extends over the entire width 45 of the sealing sleeve 30 and preferably runs parallel to the end 47. The separation point does not necessarily have to be perpendicular to the length as shown, but can also run diagonally or along any line, polygon or curve.

[0056] Fig. 5e, for example, shows an embodiment with a puzzle-shaped separation point 41 or with ends 47 shaped to match it. However, a different shape can also be used which can be fitted together in a similar way, preferably in a self-retaining manner. This allows the ends 47 and 47b of the sealing sleeve 30 to be positively connected to one another during assembly. In such an embodiment, the separation point 41 can also be cut all the way through, since the separating piece 40 is positively connected to the rest of the sleeve 30. The length of the sealing sleeve 30 can also be easily manually adjusted at the separation point 41 designed in this way, with a geometry that can be plugged into one another in a positively locking manner, by removing or establishing the positive connection, for example by moving it in the direction of the seal thickness. The tightness at the separation point 41 can be ensured by pressing, e.g.if the circumference of the sealing sleeve 30 is always selected to be at least slightly larger than the circumference of the pipe. Another advantage of this embodiment is that, when the sealing sleeve 30 is wrapped around the pipe, a positive connection can be created between the (shortened or unshortened) ends 47 of the sealing sleeve 30, which can facilitate assembly - even as a standalone invention if the sealing sleeve does not have a separation point 41 according to the invention.

[0057] Fig. 5f shows an example of a special embodiment in which at least one end 47 of the sealing sleeve 30, or the separation point, is not perpendicular to the flat sleeve 30, but is inclined at an angle 50. This allows for an improved, flat contact of the surfaces of the ends 47 against each other at the joint 37 when wrapping around the pipe, which can improve the sealing effect. Alternatively or additionally, the partial cut 41 can also be formed at an angle at the intended separation point.

[0058] Fig. 6a and Fig. 6b again show one half of a pipe coupling 10 as already shown in Figs. 1 to 3 and described in terms of its elements and reference numerals. In the clamp band 20 shown here, insertion bevels 36 on the saddle housing 27 are also specifically shown. These can improve the assembly or folding of the pipe coupling 10, especially since they can prevent canting relative to the opposite clamp band part and / or the sealing sleeve 30. As can be seen even more clearly in Fig. 8, the sealing sleeve 30 can preferably protrude asymmetrically from the open pipe coupling (or from the clamp band segment to which it is fastened), specifically in such a way that the butt joint 37 does not overlap with an area of ​​the closure distance or clamping devices 22a or 22b, but rather under the clamp band orClamp band jacket comes to rest, preferably in a region of approximately half the circumferential length of the clamp band segment. Fig. 7a and Fig. 7b show a pipe coupling according to the invention, each on a pipe with a first, large diameter 32 and a second, smaller diameter 33, respectively, both within the specified and preferably expanded compared to the prior art clamping range of the pipe coupling 10. With the double (or in other embodiments multiple) clamping areas 22a, 22b along the circumference, a large clamping range can be covered, wherein according to the invention, in a lower area (e.g. in approximately the lower half) of the clamping area, the separating piece 40 of the sealing sleeve 30 is removed at the intended separation point 41, whereby the pressing effort or the pressing work for the sealing sleeve 30 is not too great and the tightness is affected.At the joint 37, both ends 47 of the uncut sealing sleeve 30 or the new end created by the separation come into contact with each other at the separation point 41 and are pressed together when the clamping device is operated.

[0059] Fig. 8 shows an example of an embodiment of a pipe coupling 10 according to the invention in an assembled, opened view. Most of the labeled elements therein have already been explained in the preceding figures, to which reference is made. In this example, there are two provided separation points 41 and 41b for the inventive, preferably manual and tool-free shortening of the sealing sleeve 30. To make this shortening intuitive, the sealing sleeve 30 or the tear-off parts 40 can be provided with a label 78, which, for example, indicates the resulting, preferred clamping range. It is also clearly visible how the sealing sleeve 30 protrudes asymmetrically from the clamp band segment to facilitate threading during assembly. In this example, both clamping devices 22a and 22b are also separated for assembly, which is not necessarily the case; one of them can also be designed as a hinge that is not intended for separation.

[0060] As will be obvious to those skilled in the art, the embodiments and approaches shown or described here in various figures can also be combined and interchanged in accordance with the invention in a manner different from that shown.

[0061] 10 pipe coupling or pipe clamp,

[0062] Sealing or repair coupling

[0063] 20, 20a, clamp band, clamp band segments or parts, coupling half 20b

[0064] 21a, 21b clamping screws

[0065] 22a, 22b clamping device, longitudinal slot of the clamp band, clamping range,

[0066] Closure, clamping devices

[0067] 24 slotted bolts

[0068] 25 threaded bolts

[0069] 26 (Clamp) jacket

[0070] 27 (Clamp) saddle, possibly with grip element, saddle housing

[0071] 28 inner casing

[0072] 29 hole bolts

[0073] 30 cuff, sealing cuff, sealing insert

[0074] 31 Sealing lip, cuff edge (area)

[0075] 32 diameter 1

[0076] 33 diameter 2

[0077] 34 pipes to be connected, defective pipe, pipe to be repaired

[0078] 35 Pipe connection gap or pipe leak, joint

[0079] 36 Insertion nose, insertion bevel

[0080] 37 joint

[0081] 40 detachable piece, tear-off piece, tear-off part

[0082] 41,41b Separation point, perforation, partial cut, row of holes

[0083] 42 Tear-off length, distance

[0084] 44 (cuff) length, longitudinal extension

[0085] 45 (cuff) width

[0086] 46 (sleeve) thickness, sealing sleeve jacket thickness

[0087] 47, 47b Sleeve end(s), before / after tear-off, end edge or end face

[0088] 48 shortened cuff

[0089] 49 Residual material thickness of the perforation or separation point

[0090] 50 Angle adjustment, inclination

[0091] 56 Sealing sleeve Sealing lip thickness Slip protection, e.g. 0-ring Displacement protection, e.g. clip Sleeve fastening, e.g. screw, rivet Sleeve fastening, counterpart, e.g. weld-on nut, etc. Optional handle Connection, e.g. clinch point, weld point, etc. Optional labeling Clamp band connection, e.g. clinch point, weld point, etc.

Claims

Patent claims Pipe coupling (10) for connecting two pipes (34) or pipe clamp (10) for sealing a defective pipe (34), especially pipes (34) with a diameter greater than 40 mm or greater than 80 mm, comprising ■ a first and at least a second flexible clamp band segment (20) which can be tensioned around the pipe or pipes (34), ■ a first and at least one second clamping device (22a, 22b) along the circumference of the pipe coupling (10) for connecting the clamp band segments (20) and for reducing an inner diameter of the pipe coupling (10), ■ a sealing sleeve (30) or sealing insert (30) with a longitudinal extension (44) that can be placed around the pipe(s) (34) between two ends (47) of the sealing sleeve (30), which can be put under pressure by means of the tensioning device (22a, 22b) to generate radial tensioning pressure forces on the pipe(s) (34), characterized in that the sealing sleeve (30) is designed with at least one provided separation point (41, 41b) in the region of at least one end (47) of the sealing sleeve (30), at which the sealing sleeve (30) can be shortened in its longitudinal extension (44). Pipe coupling (10) according to claim 1, characterized in that the intended separation point (41, 41b) is specifically designed such that it can be separated without tools, so that the sealing sleeve (30) can be shortened, in particular by hand, by a defined tear-off piece (40) in its longitudinal extent (44) along the pipe circumference.Pipe coupling (10) according to one of the preceding claims, characterized in that at least two provided separation points (41, 41b) are formed, wherein preferably 1 to 3 or a maximum of 5 separation points (41, 41b) are formed on the sealing sleeve (30), in particular wherein the. Separating points (41, 41b) are arranged at only one of the ends (47) of the sealing sleeve (30) or at both of the ends (47) and preferably have a distance (42) in a range between 1 cm and 15 cm from the end (47).

4. Pipe coupling (10) according to one of the preceding claims, characterized in that the intended separation point (41, 41b) is formed with a perforation of the sealing sleeve (30), in particular with at least partially through holes or slots, which are preferably formed by cutting or laser cutting through the thickness (46, 56) of the sealing sleeve (30).

5. Pipe coupling (10) according to one of the preceding claims, characterized in that the intended separation point (41, 41b) is formed with a partial incision or a notch in the thickness (46, 56) of the sealing sleeve (30), preferably on the side of the sealing sleeve (30) facing the pipe (34) in the assembled state, in particular wherein the incision is formed with a depth of at least 50% to at least 99% of the thickness of the sealing sleeve (30) or preferably with a residual material thickness (49) of approximately 0.5 mm to 3 mm in the thickness (46, 56) of the sealing sleeve (30).

6. Pipe coupling (10) according to one of the preceding claims, characterized in that the ends (47) and the intended separation point (41, 41b) of the sealing sleeve (30) are formed with a non-linear geometry, preferably with a form-fitting interlocking geometry, in particular with a puzzle pattern.

7. Pipe coupling (10) according to one of the preceding claims, characterized in that the separation point (41, 41b) is substantially parallel to the end (47) of the The sealing sleeve (30) preferably runs at least approximately in the axial direction of the pipe, in particular with the separation point (41, 41b) transverse to the longitudinal extent (44). Pipe coupling (10) according to one of the preceding claims, characterized in that an end surface on at least one of the ends (47) and / or the provided separation point (41, 41b) is designed with an inclination (50) relative to an orthogonal line to the flat longitudinal extent (44) of the sealing sleeve, in particular with an inclination (50) adapted to the pipe diameter. Pipe coupling (10) according to one of the preceding claims, characterized in that the sealing sleeve (30) is fastened to an inner side of one of the clamp band segments (20) or is designed for positioning on the inner side of the clamp band segments (20), and preferably in the assembled state of the pipe coupling (10), the sealing sleeve (30), the two pipe ends of the two pipes (34) orencloses the defect in the pipe (34) and the ends (47) of the sealing sleeve (30) can be pressed together in a butt-fitting manner, preferably wherein at least one, in particular two, insertion lugs (36) are formed on the clamp band segment (20). Pipe coupling (10) according to one of the preceding claims, characterized in that the pipe coupling (10) is designed to provide a clamping range of the diameters (32, 33) of pipes (34) to be clamped therewith of at least 22 mm, preferably at least 40 mm, preferably wherein the pipe coupling (10) has at least two or more clamping ranges (22a, 22b) along its circumference for this purpose and the sealing sleeve (30) has at least one provided separation point (41, 41b) for separating a separation piece (40) for a piece in the lower region. in particular in the lower half of the clamping range, the diameter (32, 33) of the tube (34). Pipe coupling (10) according to one of the preceding claims, characterized in that the sealing sleeve (30) is elastic or rubber-elastic, preferably with a Shore hardness in a range of approximately 50 to 90, especially with a hardness of approximately 70 Shore A. Pipe coupling (10) according to one of the preceding claims, characterized in that the sealing sleeve (30) has a width (45) of at least 100 mm or 200 mm - preferably approximately 100 mm, 200 mm, 300 mm, 400 mm, 500 mm or 600 mm - , a thickness (46, 56) in a range of 4 mm to 50 mm - preferably with a thickness (46) of 4 mm to 8 mm and / or sealing lips (31) with a thickness (56) of 8 mm to 50 mm - , and / or a longitudinal extent (44) greater than the circumference of the maximum value of the clamping range of the pipe coupling (10).Pipe coupling (10) according to one of the preceding claims, characterized in that the first clamping device (22a) can be folded open and preferably the second clamping device (22b) forms a connected hinge, in particular wherein the first clamping device (22a) can be folded open by at least 90 degrees and preferably at least the first clamping device (22a) has a locking mechanism to prevent it from being pushed together. Method for improving the sealing effect of a clampable pipe coupling (10), in particular a pipe coupling (10) or a pipe clamp (10) according to one of the preceding claims, comprising. ■ providing a sealing sleeve (30) which is provided with at least one separation point (41, 41b) at at least one end (47) of the Sealing sleeve (30) is formed, at which separation point (41, 41b) the sealing sleeve (30) is designed to be shortened in its length (44), in particular without tools, ■ shortening the sealing sleeve (30) at one of the provided separation points (41, 41b) when a pipe diameter (32, 33) lies in a lower region of the clamping range of the pipe coupling (10), preferably wherein the separation can be carried out manually without tools or the separation point (41, 41b) is designed accordingly with a perforation or a partial incision. Method for mounting a pipe coupling (10) on a pipe (34), in particular a pipe coupling (10) according to one of the preceding claims, with ■ opening the pipe coupling (10) at a first Tensioning device (22a) between a first and at least one second clamp band segment (20, 20a, 20b), ■ unfolding the clamp band segments (20, 20a, 20b) on a second clamping device (22b) between the first and at least the second clamp band segment (20, 20a, 20b), ■ wrapping a pipe (34) with a sealing sleeve (30), preferably attached to one of the clamp band segments (20, 20a, 20b), wherein the sealing sleeve (30) is cut to length at a separation point (41, 41b) of the sealing sleeve (30) provided or designed for this purpose when the diameter (32, 33) of the pipe (34) lies in a lower region of the diameter clamping range of the pipe coupling (10) predetermined by the clamping devices (22a, 22b), ■ closing the clamp band segments (20, 20a, 20b) around the pipe (34) and closing the first clamping device (22a), and ■ pressing the sealing sleeve (30) between the clamp band (20, 20a, 20b) and the pipe (34) by actuating the clamping devices (22a, 22b).

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