Sealing insert for a corrugated pipe fitting system, corrugated pipe fitting system, use of a sealing insert, use of a corrugated pipe fitting system and method for mounting a corrugated pipe

Description

[0001] The invention relates to a sealing insert for a corrugated pipe screw connection system, a corrugated pipe screw connection system and a use of the sealing insert and the corrugated pipe screw connection system and a method for assembling a corrugated pipe.

[0002] Fittings for corrugated pipes are known from the prior art, for example, a cable protection system comprising corrugated pipes and fittings for the corrugated pipes, which can be attached in a single connection geometry. The fittings known from the prior art are not inherently leak-tight; rather, additional seals must be added to ensure tightness against the ingress of liquids. To ensure special sealing requirements, a cable gland system must also be provided downstream of the fitting, which makes the structure very complex.

[0003] US 2005 / 0023832 A1 discloses a corrugated pipe fitting for tightly sealing a corrugated pipe. The fitting comprises a tubular fitting body, a sleeve-shaped holder, and a union nut. The fitting body has a collar with a receiving hole for the corrugated pipe and an external thread. The holder has a through hole with two circumferential ribs for engaging the corrugations of the corrugated pipe. The union nut has an internal thread that engages the external thread. The holder has a short pipe section and an outwardly projecting flange at one end. The pipe section has a uniform, circular-cylindrical outer contour with an outer diameter over its length, and the receiving hole of the collar has a circular-cylindrical inner contour with an inner diameter equal to the outer diameter. The holder sits with the pipe section in the receiving hole of the collar.The flange is adjacent to a first end face of the holder and extends along a longitudinal axis of the holder to the short pipe section, and the short pipe section is adjacent to a second end face of the holder and extends along the longitudinal axis to the flange.

[0004] GB 2 178 125 A discloses a coupling for a corrugated pipe. The coupling comprises a tubular main body, a sleeve, and a union nut. The main body has a collar with a receiving hole for the corrugated pipe and an external thread. The sleeve has a through-hole with a plurality of circumferential ribs for engaging the corrugations of the corrugated pipe. The union nut has an internal thread that engages the external thread. The sleeve comprises a single outer wall portion that borders both a first and a second end surface of the sleeve and extends along a longitudinal axis of the sleeve from the first to the second end surface.This single outer wall section has a hexagonal outer contour that is uniform over its entire length, and the receiving hole of the sleeve has a hexagonal inner contour that corresponds to the hexagonal outer contour, so that the sleeve sits slidably but not rotatably in the receiving hole of the sleeve.

[0005] US 2015 / 0316187 A1 discloses a coupling for a corrugated pipe. The coupling comprises a tubular connecting piece, a sleeve, and a union nut. The connecting piece has a collar with a receiving hole for the corrugated pipe and an external thread. The sleeve has a through hole with several circumferential ribs for engaging the corrugations of the corrugated pipe. The union nut has an internal thread that engages the external thread. The sleeve has a short pipe section and an outwardly projecting flange at one end. The pipe section has a uniform, circular-cylindrical outer contour with an outer diameter over its length, and the receiving hole of the collar has a circular-cylindrical inner contour with an inner diameter equal to the outer diameter. The sleeve sits with the pipe section in the receiving hole of the collar.The flange is adjacent to a first end face of the sleeve and extends along a longitudinal axis of the sleeve to the short pipe section, and the short pipe section is adjacent to a second end face of the sleeve and extends along the longitudinal axis to the flange.

[0006] US 7,055,868 B2 discloses a screw connection for a corrugated pipe with a holder comprising two sections with different outer diameters.

[0007] The object of the invention is to improve the fittings known from the prior art. In particular, the object of the invention is to provide a compact fitting or a system with which a corrugated pipe can be tightly attached to a connection geometry.

[0008] The object is achieved according to the invention by means of a sealing insert for a corrugated pipe screw connection system, comprising a recess for receiving a corrugated pipe, a first and a second end face; a first outer wall section with a first outer diameter and a second outer wall section with a second outer diameter; where an inner wall of the sealing insert delimiting the recess comprises at least one, preferably a plurality, in particular at least two, partially circumferential ribs; the first outer wall section borders the first end face and extends along a longitudinal axis of the sealing insert to the second outer wall section; the second outer wall section borders the second end face and extends along the longitudinal axis to the first outer wall section; the first outer diameter is greater than the second outer diameter; the first and second outer wall sections are each cylindrical; an anti-twist device is arranged on an outer surface of the sealing insert; and the anti-twist device is assigned to the second outer wall section, the anti-twist device has a plurality of locking elements designed as grooves and / or ribs, arranged parallel to the longitudinal direction of the sealing insert.

[0009] Furthermore, the object is achieved according to the invention by means of a corrugated pipe screw connection system comprising at least a pressure screw, a screw connection body and a sealing insert according to the invention.

[0010] Furthermore, the object is achieved according to the invention by means of a use of a sealing insert according to the invention in a corrugated pipe screw connection system according to the invention for sealing a corrugated pipe with respect to a screw connection body of the corrugated pipe screw connection system and for preventing twisting of the sealing insert and / or the corrugated pipe in a screw connection body.

[0011] Furthermore, the object is achieved according to the invention by using a corrugated pipe screw connection system according to the invention for connecting a corrugated pipe to a connection geometry.

[0012] Furthermore, the object is achieved according to the invention by means of a method for assembling a corrugated pipe with a plurality of corrugation troughs on a connection geometry, comprising the steps: Threading a pressure screw onto the corrugated pipe; inserting the corrugated pipe into the recess of a sealing insert according to the invention such that at least one rib, preferably a plurality of ribs, in particular at least two ribs, engages with a corrugation trough, or if at least two ribs are provided, two corrugation troughs, generally with a predetermined number of ribs, these engage with a number of corrugation troughs of the corrugated pipe corresponding to this number of ribs; inserting a screw body into the connection geometry; inserting the sealing insert with the corrugated pipe into the screw body, wherein the anti-twist device of the sealing insert is brought into engagement with an anti-twist device of the screw body and the sealing insert protrudes from the screw body with the first outer wall section;and screwing the pressure screw onto the screw body in such a way that a material displacement of a material of the sealing insert is generated by means of the pressure screw, wherein the material at least partially forms a sealing contact with the corrugated pipe.

[0013] A sealing insert for a corrugated pipe fitting system is proposed, comprising a recess, in particular a recess extending completely through the sealing insert, formed in the direction of a longitudinal axis of the sealing insert, for receiving a corrugated pipe. An anti-twist device is arranged on an outer surface of the sealing insert. An inner wall delimiting the recess comprises at least one, preferably a plurality, in particular at least two, at least partially circumferential ribs.

[0014] A corrugated pipe within the meaning of the invention is a pipe made of a material, such as a plastic or a metal, with a diameter that varies in a wave-like manner in a longitudinal direction of the pipe at least in a partial region or partial length of the pipe, preferably over an entire length of the pipe, in particular an outer diameter that varies in a wave-like manner in the longitudinal direction, more preferably also an inner diameter that varies in a wave-like manner in the longitudinal direction, even more preferably an outer diameter and an inner diameter whose corrugations coincide in their corrugation troughs and corrugation crests. Due to the corrugation caused by the formation of corrugations at least on an outer surface of the pipe, preferably also on an inner surface of the pipe, the corrugated pipe is flexible. The corrugations are preferably ring-shaped diameter changes in the longitudinal direction. The at least two corrugations form a corrugation crest and a corrugation trough between two corrugations.The corrugations can be continuous or discrete. For example, continuously configured corrugations run essentially sinusoidally in a longitudinal section of the corrugated pipe. In an exemplary design of the corrugated pipe with a discrete course of the corrugations, these have a flat section, particularly between two corrugation crests on the outer surface of the corrugated pipe, which forms a corrugation trough. In cross-section, the corrugation crests can be approximately or exactly sinusoidal, rectangular, trapezoidal, semicircular, or partially oval. A screw connection system with an insert can be provided or arranged adjacent to the corrugated pipe. This insert engages cables or hoses routed in the corrugated pipe, so that they are held in place in the screw connection system and advantageously also achieves a certain sealing effect through the insert.

[0015] Insofar as the term "essentially" is used in this case, it indicates a tolerance range that is acceptable to the person skilled in the art from an economic and technical point of view, so that the corresponding feature can still be recognized or realized as such.

[0016] In one embodiment, the sealing insert is substantially cylindrical. In another embodiment, the sealing insert has the first end face and the second end face, which are opposite one another. Further preferably, the sealing insert comprises an outer shell, which preferably at least partially has the configuration of a cylindrical shell. Furthermore, the sealing insert preferably comprises a recess that extends completely through the sealing insert.

[0017] In the context of the invention, "completely continuous" means that the recess extends completely from a first end face to a second end face in a longitudinal direction defined thereby along a longitudinal axis of the sealing insert. This also defines the length of the sealing insert and thus also of its inner wall. The recess is preferably designed to accommodate a corrugated pipe.

[0018] In one embodiment, the recess comprises a delimiting inner wall. The inner wall delimiting the recess can be at least partially cylindrical and / or at least partially conical.

[0019] In one embodiment, the completely continuous recess is delimited by an inner wall. The inner wall has a first inner wall section. In one embodiment, the first inner wall section is assigned to the first end face of the sealing insert. In a further embodiment, the first inner wall section is assigned to the second end face of the sealing insert. More preferably, the first inner wall section comprises at least one, preferably a plurality of, partially circumferential ribs. The ribs are particularly designed such that they extend in a radially inward direction, preferably into a cavity formed by the recess. The ribs are preferably completely circumferential. For the purposes of the present invention, the term "circumferential" is to be understood as meaning that a longitudinal extent of a rib extends along a circumference of the inner wall.The longitudinal extension of a rib runs perpendicular to the longitudinal axis of the sealing insert. A completely circumferential rib forms a closed ring. The ribs can also be partially circumferential. Preferably, a partially circumferential rib does not extend over the entire circumference of the inner wall and forms one or more rib segments, which can also be referred to as ring segments. In a further embodiment, a plurality of rib segments are arranged at a height of the inner wall, which are preferably spaced from one another in the circumferential direction. A plurality of rib segments arranged at a height on the inner wall in the circumferential direction are to be understood as a partially circumferential rib within the meaning of the invention.

[0020] In a further embodiment, the rib is approximately or exactly trapezoidal, rectangular, triangular, arc-segment-shaped and / or at least partially oval in cross-section. The ribs preferably each have two flanks which, particularly in the case of a triangular, trapezoidal and / or arc-segment-shaped design of the ribs, are at an angle of approximately 60° to approximately 90°, preferably approximately 65° to approximately 75°, more preferably approximately 70° to one another. In a preferred embodiment, which can be referred to as rectangular, the two flanks are connected to one another via a central section. The two flanks are then essentially parallel to one another. The central section can be linear or arc-shaped.

[0021] Preferably, the first inner wall section has a plurality of partially inner circumferential ribs, preferably about two to about ten, more preferably about three to about four, preferably completely circumferential ribs.

[0022] If the term "approximately" is used in the context of the invention in connection with values ​​or value ranges, this is to be understood as a tolerance value that a person skilled in the art considers customary in this field. In particular, a tolerance range of ±20%, preferably ±10%, more preferably ±5% is provided. To the extent that different value ranges, for example preferred and more preferred value ranges, are specified in the present invention, the lower limits and upper limits of the various value ranges can be combined with one another.

[0023] In a further embodiment, the ribs are spaced apart from one another in the longitudinal direction of the sealing insert, preferably at an approximately uniform distance. In particular, the spacing of the ribs is dimensioned such that the corrugation crests of a corrugated tube can engage between the ribs. In particular, if only one rib is provided, it can be arranged in a corrugation trough of the corrugated tube. In this embodiment, the rib preferably has a shape that is adapted to a corrugation trough of the corrugated tube, in particular its outer contour essentially corresponds to the contour of the corrugation trough.Preferably, the spacing of the ribs, the radial extent of the ribs into the cavity formed by the recess, the cross-section of the ribs and / or an angle of the flanks of the ribs are adapted to the corrugation of a corrugated pipe, at least to a partial area or a partial length thereof, which can or should interact with the sealing insert. Preferably, the outer contour of the ribs substantially corresponds to a contour of the corrugation troughs of the corrugated pipe. In particular, the sealing insert is designed such that, when designed with at least two ribs, engagement in corrugation troughs of the corrugated pipe is possible by means of these. In a further preferred embodiment, it is provided that the ribs have the same center-to-center spacing as the center-to-center spacing of the corrugated pipe that can be used with the sealing insert.Preferably, the extension of the ribs in the longitudinal direction of the sealing insert is less than or equal to an extension of the corrugation troughs in the longitudinal direction of the corrugated pipe.

[0024] In a further embodiment, it is provided that the distance between two ribs adjacent in the longitudinal direction of the sealing insert from center to center of the ribs is approximately 1 mm to approximately 1 cm.

[0025] In a further embodiment, the at least partially circumferential ribs are distributed over the length of the first inner wall section, and in an alternative embodiment, preferably over the entire length of the inner wall defining the recess. In this alternative embodiment, the design of the inner wall is thus identical to that of the first inner wall section.

[0026] In a further embodiment, at least one rib is flush with the first end face or the second end face. In particular, the rib may form part of the first end face and / or the second end face.

[0027] In a further embodiment, it is provided that the inner wall delimiting the recess comprises a second inner wall section. It is preferably provided that the second inner wall section does not have any ribs. The second inner wall section is not implemented if, as described above, in an alternative embodiment, the inner wall has ribs over its entire length. In one embodiment, it is provided that the inner wall of the sealing insert comprises the first inner wall section and the second inner wall section, wherein the first inner wall section comprises the ribs and wherein the second inner wall section does not comprise any ribs. In one embodiment, it is provided that the second inner wall section has a substantially smooth surface.

[0028] The lengths of the inner wall sections along the longitudinal axis can be freely selected independently of one another as required. For example, the first inner wall section can be shorter or longer than the second inner wall section, or as long as the second inner wall section.

[0029] In a further embodiment, the first end face and the second end face are opposite each other, with the sealing insert comprising at least one slit extending from the first end face to the second end face. The slit allows the seal to be conveniently placed around the corrugated pipe, so that it is not necessary to push the corrugated pipe through the sealing insert against the resistance of the seal and, in particular, the ribs.

[0030] In a further embodiment, the sealing insert is provided with two slits. This results in a two-part design of the sealing insert, which allows the corrugated pipe to be quickly and conveniently fitted with the sealing insert. In particular, a two-part design of the sealing insert is provided when the material of the sealing insert is so rigid that it would either be uncomfortable for the user to bend the sealing insert open, or that the material could be plastically deformed and / or broken when bent open to mount the sealing insert on the corrugated pipe.

[0031] In a further embodiment, it is provided that the sealing insert has no slits.

[0032] It is provided that the first outer wall section is assigned to the first end face of the sealing insert. The first outer wall section is an outer lateral surface section of the sealing insert with the first outer diameter. The first outer wall section borders the first end face.

[0033] The second outer wall section is an outer surface section of the sealing insert with the second outer diameter. The second outer wall section borders the second end face.

[0034] The lengths of the outer wall sections along the longitudinal axis can be freely selected independently of one another as required. For example, the first outer wall section can be shorter or longer than the second outer wall section, or as long as the second outer wall section.

[0035] The lengths of the outer wall sections and the inner wall sections in the direction of the longitudinal axis can be selected independently of one another as required. For example, the first outer wall section can be shorter or longer than the first inner wall section or as long as the first inner wall section, and / or shorter or longer than the second inner wall section or as long as the second inner wall section, and / or the second outer wall section can be shorter or longer than the first inner wall section or as long as the first inner wall section, and / or shorter or longer than the second inner wall section or as long as the second inner wall section.

[0036] In one embodiment, the material thickness of the sealing insert decreases toward the first end face and / or the second end face. In particular, the change in the material thickness is continuous. In a further preferred embodiment, the change in the material thickness of the sealing insert occurs discretely, i.e., in steps or stages.

[0037] In a further embodiment, the reduction in the material thickness of the sealing insert is achieved by an increasing inner diameter of the recess of the sealing insert toward the first end face, wherein the outer diameter of the sealing insert increases discretely by providing a step. It is particularly preferably provided that the second inner wall section of the inner wall of the recess is conical, while according to the invention the first and also the second outer wall section remain substantially cylindrical. It is further preferably provided that a conicity of the second inner wall section tapers toward the first inner wall section.

[0038] In a further embodiment, it is provided that the material thickness of the sealing insert becomes smaller, i.e. decreases, only in the region of the second inner wall section towards the first or the second end face, depending on the embodiment.

[0039] For example, the first outer wall section and a second inner wall section are each arranged adjacent to the first end face. According to the invention, the outer diameter of the second outer wall section is smaller than that of the first outer wall section. The first inner wall section and the second outer wall section are arranged adjacent to the second end face. According to the invention, the first outer wall section and the second outer wall section are each cylindrically designed. The first inner wall section is essentially cylindrical and has inwardly projecting ribs. In this embodiment, the second inner wall section is conical and has an inner diameter that increases towards the first end face.

[0040] In a further embodiment, the material thickness of the sealing insert in the region of the second inner wall section remains substantially constant over its length in the longitudinal direction of the sealing insert. Furthermore, this sealing insert can preferably be designed as in the embodiment described above. In particular, in a further embodiment, the material thickness of the sealing insert becomes smaller, i.e., decreases, in at least one partial section of the second inner wall section toward the first end face of the sealing insert.

[0041] In a further embodiment, an externally circumferential shoulder, which can also be referred to as a step, is formed between the first outer wall section and the second outer wall section. A discrete transition in the form of a step or a shoulder is preferably provided from the first outer diameter to the second outer diameter. In a further embodiment, a continuous transition from the first outer wall section with the first outer diameter to the second outer wall section with the second outer diameter is provided, wherein in one embodiment at least a partial section of the outer wall is conical towards the second end face of the sealing insert. In a further embodiment, it is provided that the material thickness of the sealing insert is constant towards the second end face.

[0042] According to the invention, the sealing insert comprises an anti-twist device. According to the invention, an anti-twist device is arranged on an outer surface of the sealing insert.

[0043] According to the invention, the anti-rotation device comprises a plurality of locking elements arranged parallel to the longitudinal direction of the sealing insert. The locking elements are designed as grooves and / or ribs.

[0044] The grooves can be, in particular, longitudinal notches or recesses. The ribs are, in particular, longitudinal projections projecting radially outward. According to the invention, the anti-rotation device is assigned to the second outer wall section. Preferably, the anti-rotation device is arranged adjacent to the first outer wall section on the second outer wall section. In a further embodiment, it is provided that the locking elements arranged parallel to a longitudinal axis extend from the first outer wall section to adjacent to the second end face over the second outer wall section and thus over the entire length of the second outer wall section.

[0045] In a further embodiment, the anti-rotation device is arranged on the second outer wall section at a distance from the second end face. In particular, the second outer wall section is formed with a smooth or flat surface between the anti-rotation device and the second end face.

[0046] In a further embodiment, the anti-rotation device is arranged on the second outer wall section at a distance from the first outer wall section. In particular, the surface of the second outer wall section between the anti-rotation device and the first outer wall section is smooth or flat. In this embodiment, the anti-rotation device can extend adjacent to the second end face of the sealing insert.

[0047] In a further preferred embodiment, the anti-rotation device is preferably arranged completely circumferentially on the outer casing. In particular, the locking elements are evenly distributed around the circumference of the second outer wall section. The locking elements of the anti-rotation device can have a cross-sectional shape similar to the ribs on the inner wall of the sealing insert, as described above.

[0048] In one embodiment, it is provided that the sealing insert comprises a material which is preferably elastically deformable, selected from a group comprising silicone, thermoplastic elastomers and / or rubber.

[0049] In an exemplary embodiment, the sealing insert comprises a first end face and a second end face. The exemplary sealing insert is substantially cylindrical in shape and has a completely continuous recess. An outer shell of the sealing insert comprises the first and second outer wall sections, wherein the first outer wall section borders on the first end face and the second outer wall section borders on the second end face. The second outer wall section comprises, for example, an anti-twist device configured as a plurality of axially parallel locking elements distributed around the circumference of the second outer wall section. The anti-twist device borders, for example, on the first outer wall section and projects approximately to the middle of the second outer wall section.The locking elements each have, for example, two flanks which are at a flank angle of approximately 70° to one another or are formed approximately parallel to one another, wherein these flanks are then connected by a central part, as described above in connection with the formation of the ribs on the inner wall seen in cross section.

[0050] The exemplary sealing insert comprises a slit that extends completely continuously from the first end face to the second end face. The slit allows the sealing insert to be bent open and applied to a corrugated pipe (not shown here). In another exemplary embodiment, the sealing insert is designed in two parts, with two slits extending completely continuously from the first end face to the second end face.

[0051] The completely continuous recess comprises a first inner wall section and a second inner wall section. The second inner wall section has a smooth surface. It also has a conical design. In particular, the inner wall in the second inner wall section tapers towards the first inner wall section or widens towards the first end face of the sealing insert. The inner diameter of the second inner wall section increases in the direction of the first end face of the sealing insert. The second inner wall section has a second material thickness which tapers or becomes smaller at least in sections towards the first end face, whereby the recess in the second inner wall section is conical.

[0052] The first inner wall section comprises, for example, four inner circumferential ribs on the inner wall of the recess. The first inner wall section borders the second end face. In an alternative exemplary embodiment, the ribs are distributed substantially evenly over the entire height of the inner wall. In this embodiment, the sealing insert has only a first inner wall section. At least one rib can be flush with the end face, for example, the first end face and / or the second end face.

[0053] On the outer shell, the exemplary sealing insert comprises the first and second outer wall sections. The first outer wall section has a first outer diameter that is larger than the second outer diameter of the second outer wall section. This creates a shoulder that prevents the sealing insert from being pushed too far into a screw connection body, which may be, for example, a double nipple or another, particularly plug-like, component with a thread arranged on at least one side for accommodating a pressure screw.

[0054] In a second exemplary embodiment, the sealing insert comprises a first inner wall section of the recess and a second inner wall section of the recess. In the second exemplary embodiment, the first inner wall section, which has the inner circumferential ribs, borders the first end face, wherein, in particular, the inner circumferential rib is flush with the first end face. The first inner wall section of the recess is thus arranged approximately in the region of the first outer wall section. Furthermore, the second inner wall section of the recess is arranged approximately in the region of the second outer wall section.

[0055] Furthermore, a corrugated pipe screw connection system is proposed which comprises at least one pressure screw, a screw connection body and a sealing insert as described above.

[0056] The screw connection body is designed in particular as a double nipple, but can also be designed differently, for example as a plug housing or component with a thread arranged on at least one side for arranging the pressure screw. The screw connection body preferably has a first external thread, and more preferably a second external thread. More preferably, the screw connection body has a key contact structure with at least one key contact surface between the first external thread and the second external thread. In one embodiment, the key contact structure comprises a stop surface for the pressure screw. If the screw connection body is not designed as a double nipple and in particular does not have a key contact structure, it can nevertheless have a stop surface, which is provided, for example, by a component or plug housing of the screw connection body arranged opposite the thread.If the pressure screw is screwed onto the screw connection body, it can in particular be screwed on far enough that it is screwed down to the stop surface and thus blocked with the screw connection body. In particular, the pressure screw can be screwed onto the screw connection body in a block manner using the stop surface. This has the advantage that the pressure screw cannot simply work itself loose from the screw connection body, for example due to temperature fluctuations or vibrations. The pressure screw is in particular designed as a union nut with a central through-hole. In particular, the pressure screw has a pressure contour on the inner wall of the recess, by means of which the sealing insert introduced into the screw connection body can be at least partially deformed when the pressure screw is screwed onto the screw connection body.

[0057] In one embodiment, it is provided that the screw body comprises an anti-rotation device that corresponds to the anti-rotation device of the sealing insert. In particular, it is provided that the sealing insert has a rib, preferably a plurality of ribs, on the second outer wall section, and the screw body has a groove, preferably a plurality of grooves, into which the ribs of the sealing insert can engage. In a further embodiment, it is provided that the screw body has a rib, preferably a plurality of ribs, on the inner surface of the continuous recess, which engage in grooves of the anti-rotation device of the sealing insert. In a further embodiment, it is provided that both the sealing insert on the second outer wall section and the screw body on the inner surface have a rib, preferably a plurality of ribs, which preferably interlock with one another in an offset manner.

[0058] A first exemplary embodiment of a corrugated pipe fitting system comprises a pressure screw and a fitting body onto which the pressure screw can be screwed. The sealing insert is inserted into the fitting body, in particular in the region of the at least one external thread of the fitting body. An O-ring, which is arranged, for example, in an annular groove in a key contact structure or in a region of a contact surface on the fitting body, can seal it against a connection geometry that is not part of the proposed corrugated pipe fitting system and is only designed, for example, as a fuse box, machine part, etc. The fitting body has an internal anti-twist device that corresponds to the anti-twist device of the sealing insert.The individual parallel locking elements of the anti-twist device of the sealing insert engage in the areas between the parallel locking elements of the anti-twist device of the screw connection body.

[0059] In one embodiment, an inner diameter of the screw connection body in a region in which the sealing insert is inserted is smaller than the first outer diameter of the sealing insert. Preferably, the first outer diameter is larger than a core diameter of the screw connection body. The core diameter is the smallest inner diameter of the screw connection body in the insertion region of the sealing insert in the region of the at least one external thread of the screw connection body, which is determined in particular by the parallel locking elements. Further preferably, the first outer diameter of the sealing insert is smaller than or approximately equal to an outer diameter of the at least one external thread of the screw connection body. The sealing insert is thus only partially inserted into the screw connection body, such that the first outer wall section sits on the screw connection body, in particular supported by a shoulder of the sealing insert.More preferably, the sealing insert preferably protrudes from the screw body with the first outer wall section. More preferably, the sealing insert protrudes into the screw body with the first outer wall section and / or the second outer wall section, particularly if the second outer wall section has a smaller outer diameter than the first outer wall section of the sealing insert. When the pressure screw is screwed onto the screw body, it presses on the sealing insert.

[0060] The pressure screw has an internal, circumferential pressure contour that presses against the first outer wall section of the sealing insert when the pressure screw is screwed onto the fitting body. Advantageously, the pressure screw can be screwed onto a stop surface of the fitting body, e.g., provided by a key system structure or a component of the fitting body, independently of a corrugated pipe inserted into the corrugated pipe fitting system, particularly within certain dimensional tolerances of a corrugated pipe diameter.Such a screw connection is referred to in the context of the present invention as a block screw connection and has the advantage that accidental loosening, for example due to temperature fluctuations or vibrations, is reduced because the thread geometries of the pressure screw and the screw connection body are clamped together. With a conical design of the second inner wall section of the recess in the sealing body, the material of the sealing body can be displaced up to the corrugated pipe, in particular radially inwards, without the corrugated pipe being damaged. This is a particularly advantageous embodiment when the material of the sealing insert is very strong or rigid or the sealing insert has a large volume, because with a conical design of the second inner wall section the forces required for a block screw connection are reduced.

[0061] In a second exemplary embodiment of the corrugated pipe fitting system, it comprises a two-part sealing insert. Two slits are provided for the two-part sealing insert.

[0062] Furthermore, the use of a sealing insert as described above in a corrugated pipe fitting system as described above is proposed for sealing a corrugated pipe against the corrugated pipe fitting system and for preventing twisting of the sealing insert and / or the corrugated pipe in a fitting body.

[0063] Furthermore, the use of a corrugated pipe fitting system, as described above, for connecting a corrugated pipe to a connection geometry is proposed. The corrugated pipe can also be extended through the interior of the corrugated pipe fitting system, so that it protrudes on both sides. The corrugated pipe is advantageously inserted into the sealing insert in such a way that, when installed, it protrudes beyond the corrugated pipe fitting system on the pressure screw side and on the screw body side. The installed state is defined by the corrugated pipe being encompassed by the corrugated pipe fitting system and sealed by tightening the pressure screw.

[0064] Furthermore, a method for assembling a corrugated pipe with a plurality of corrugation troughs to a connection geometry is proposed, comprising the steps: Threading a pressure screw onto the corrugated pipe; inserting the corrugated pipe into the recess of a sealing insert according to the invention such that at least one, preferably a plurality, in particular at least two, ribs engage with a corrugation trough, or if at least two ribs are provided, two corrugation troughs, generally with a predetermined number of ribs, these engage with a number of corrugation troughs of the corrugated pipe corresponding to this number of ribs; inserting a screw body into the connection geometry; inserting the sealing insert with the corrugated pipe into the screw body, wherein the anti-twist device of the sealing insert is brought into engagement with an anti-twist device of the screw body and the sealing insert protrudes from the screw body with the first outer wall section;and screwing the pressure screw onto the screw body in such a way that a material displacement of a material of the sealing insert is generated by means of the pressure screw, wherein the material at least partially seals against the corrugated pipe. ;

[0065] The connection geometry is a component to which the corrugated pipe can be connected by means of the corrugated pipe screw connection system. In particular, at least one elongated part, for example at least one cable, can be guided through the connection geometry, which runs through the corrugated pipe. The connection geometry is not part of the corrugated pipe screw connection system according to the invention. For example, the connection geometry is a wall, a housing, a machine part, a connector for establishing an electrical connection, or a cable guide. The corrugated pipe screw connection system is advantageously attached to the connection geometry not belonging to the corrugated pipe screw connection system. The connection geometry preferably has a through-hole through which the at least one elongated part can be guided.Further preferably, the corrugated pipe screw connection system is attached to the connection geometry in such a way that the longitudinal axis of the connection part is substantially perpendicular to a surface of the connection geometry and / or extends through the through-hole. In one embodiment, the through-hole has a thread into which the screw connection body can advantageously be screwed with its external thread. In a further embodiment, the through-hole has no thread and is designed in particular as a bore. The screw connection body can be inserted through the through-hole and, for example, if it has an external thread there, screwed onto the opposite side of the connection geometry using a nut. However, other types of fastening are also possible, depending on the design of the screw connection body.The corrugated pipe can advantageously be inserted into the sealing insert in such a way that it projects beyond the corrugated pipe screw connection system on the pressure screw side and on the screw connection body side in the assembled state.

[0066] Preferably, the sealing insert is inserted into the screw connection body such that the first outer wall section rests on the screw connection body. In one embodiment, it is provided that by screwing the pressure screw onto the screw connection body, the sealing insert arranged in the screw connection body and protruding therefrom is deformed by a pressure contour of the pressure screw on its inner side in such a way that the material of the sealing insert is displaced, in particular, radially inwardly, whereby a displacement of the material can also occur in other directions. As a result of this and in particular due to the additional sealing provided by the ribs of the sealing insert, which fit into the corrugation troughs of the corrugated pipe, a particularly high level of tightness is created.

[0067] According to the invention, it is provided that an anti-rotation device of the sealing insert is brought into engagement with an anti-rotation device of the screw body, in particular in order to reliably prevent rotation of the sealing insert in the screw body. Further preferably, a locking element of the second outer wall section of the sealing insert, preferably a plurality of locking elements of the second outer wall section of the sealing insert, is brought into engagement with a locking element of the screw body, preferably with a plurality of locking elements of the screw body. Further preferably, a locking element of the anti-rotation device of the sealing insert, preferably a plurality of locking elements of the anti-rotation device of the sealing insert, is brought into engagement with a locking element of the screw body, preferably with a plurality of locking elements of the screw body.

[0068] In a further embodiment, it is provided that the pressure screw is screwed onto a stop surface of the screw connection body.

[0069] This block-to-block screw connection, i.e., the screwing of the pressure screw onto the stop surface of the screw body, can be achieved in particular by conically designing the inner wall of the sealing insert that defines the recess, particularly in the first inner wall section or the second inner wall section facing the pressure screw. The advantage of the block-to-block screw connection is that a uniform force is exerted on the corrugated pipe and, in particular, excessive, particularly localized, pressure from the screw connection or the sealing insert on the corrugated pipe can be avoided, which could damage the corrugated pipe. This achieves a good sealing effect.

[0070] Further advantageous embodiments will become apparent from the following drawings. However, the developments presented therein are not to be interpreted as limiting; rather, the features described therein can be combined with one another and with the features described above for further refinement. Furthermore, it should be noted that the reference numerals used in the description of the figures do not limit the scope of the present invention, but merely refer to the exemplary embodiments shown in the figures. Identical parts or parts with the same function have the same reference numerals below. They show: FIG. 1 shows a sealing insert according to the invention; FIG. 2 shows the sealing insert from FIG. 1 in a view of a second end face; FIG. 3 a sectional view III-III of FIG. 2; FIG. 4 an alternative embodiment of a sealing insert according to the invention; FIG. 5 a plan view of the second end face of the sealing insert from FIG. 4 ; FIG. 6 a sectional view VI-VI of FIG. 5 ; FIG. 7 shows an exploded view of a corrugated pipe screwing system according to the invention; FIG. 8 shows a view of a pressure screw of the assembled corrugated pipe screwing system from FIG. 7 ; FIG. 9 a sectional view IX-IX of FIG. 8 and FIG. 10 shows a further embodiment of a corrugated pipe screw connection system according to the invention.

[0071] FIG. 1shows a sealing insert 10 with a first end face 12 and a second end face 14. The sealing insert 10 is substantially cylindrical in shape and has a completely continuous recess 16. An outer shell 18 of the sealing insert 10 comprises a first outer wall section 20 and a second outer wall section 30, wherein the first outer wall section 20 borders the first end face 12 and the second outer wall section 30 borders the second end face 14. An outer diameter of the first outer wall section 20 is larger than that of the second outer wall section 30, wherein these are discretely adjacent to one another by a step 15.

[0072] The second outer wall section 30 comprises an anti-rotation device 40, which is configured as a plurality of axially parallel locking elements 42 distributed around the circumference of the second outer wall section 30, which are not all provided with reference numerals for the sake of clarity. The anti-rotation device 40 borders the first outer wall section 20 and, in this embodiment, extends in its longitudinal extent to approximately the middle of the second outer wall section 30.

[0073] The sealing insert 10 includes a slit 19 that extends continuously from the first end face 12 to the second end face 14. The slit allows the sealing insert 10 to be bent open and applied to a corrugated pipe (not shown here).

[0074] FIG. 1 It can also be seen that the sealing insert 10 has at least one circumferential rib 62 on an inner wall 60 of the recess 16.

[0075] FIG. 2shows a plan view of the second end face 14 of the sealing insert 10 of the FIG. 1 The anti-rotation device comprises a plurality of axially parallel locking elements 42, which are arranged particularly uniformly on an outer circumference of the second outer wall section 30. This view also shows a rib 62, which is arranged in the recess 16 extending completely through the sealing insert 10.

[0076] FIG. 3 shows a sectional view III-III of the FIG. 2The completely continuous recess 16, which extends in the direction of a longitudinal axis 11, comprises the inner wall 60, which forms a first inner wall section 64 and a second inner wall section 66. The second inner wall section 66 has a conical configuration. It borders on the first end face 12 and is assigned to the first outer wall section 20. In particular, the inner wall 60 in the second inner wall section 66 tapers towards the first inner wall section 64, or the inner wall 60 widens towards the first end face 12. An inner cross-section of the inner wall 60 in the second inner wall section 66 thus increases towards the first end face 12 of the sealing insert 10. The second inner wall section has a material thickness that decreases towards the first end face 12. The recess 16 is conical in the second inner wall section 66.

[0077] The first inner wall section 64 comprises four circumferentially extending ribs 62.1 to 62.4, wherein the rib 62.1 of the FIG. 1 The only clearly visible rib 62 corresponds to the first inner wall section 64. It borders on the second end face 14. It is associated with the second outer wall section 30.

[0078] The outer shell 18 of the sealing insert 10 comprises the first outer wall section 20 and the second outer wall section 30. The first outer wall section 20 has a first outer diameter 22 which is larger than a second outer diameter 32 of the second outer wall section 30. This forms a step 15 which, as shown for example in the FIG. 9 As can be seen, pushing too far into a FIG. 9 shown, designed as a double nipple, prevents screw connection body 74.

[0079] The lengths of the outer wall sections 20, 30 and the inner wall sections 64, 66 in the direction of the longitudinal axis 11 are selected, for example, such that the first outer wall section 20 is shorter than the second inner wall section 66, the second inner wall section 66 is shorter than the first inner wall section 64, and the first inner wall section 64 is shorter than the second outer wall section 30. However, these lengths can also be selected independently of one another as required.

[0080] FIG. 4shows an alternative embodiment of a sealing insert 10. The sealing insert 10 has a slit 19, which allows the sealing insert 10 to be bent apart in order to fasten it to a corrugated pipe (not shown). The sealing insert 10 has a first end face 12 and a second end face 14. Furthermore, the sealing insert 10 has internally circumferential ribs 62.1, 62.2, and 62.3. The circumferential rib 62.1 is flush with the first end face 12. In particular, one flank of the rib 62.1 at least partially forms the first end face 12. An anti-twist device 40 is arranged on the outer casing 18.

[0081] FIG. 5 shows a view of the sealing insert 10 from FIG. 4 on the second end face 14. In detailed view V it can be seen that the anti-rotation device 40 has axially parallel locking elements 42 which have a flank angle α of approximately 70°.

[0082] FIG. 6shows the section view VI-VI from FIG. 5 The sealing insert 10 comprises a first inner wall section 64 of the recess 16 and a second inner wall section 66 of the inner wall of the recess 16. The first inner wall section 64, which has the inner circumferential ribs 62.1 to 62.4, borders the first end face 12, with the inner circumferential rib 62.1 being flush with the first end face 12. The first inner wall section 64 of the recess 16 is assigned to a first outer wall section 20, which borders the first end face 12. The second inner wall section 66 of the recess 16 is assigned to a second outer wall section 30, which borders the second end face 14. Between the first outer wall section 64, which has a larger outer diameter than the second outer wall section 66, a step 15 is formed, as in the embodiment according to the FIGS. 1 to 3 .

[0083] The lengths of the outer wall sections 20, 30 and the inner wall sections 64, 66 in the direction of the longitudinal axis 11 are selected, for example, such that the first outer wall section 20 is as long as the first inner wall section 64 and shorter than the second inner wall section 66, and the second inner wall section 66 is as long as the second outer wall section 30. However, these lengths can also be selected independently of one another as required.

[0084] FIG. 7 shows a corrugated pipe screw connection system 70 with a pressure screw 72 and a screw body 74 onto which the pressure screw 72 can be screwed. In the screw body 74, a sealing insert 10 is formed similarly to the sealing insert 10 according to the FIGS. 1 to 3, with a slit 19. An O-ring 84, which is arranged on the screw connection body 74 designed as a double nipple, seals it against a connection geometry not shown. The screw connection body 74 has an internal anti-twist device 76, which corresponds to an anti-twist device 40 of the sealing insert 10. The individual axially parallel locking elements, which are designated by 42.1 and 42.2 for example, of the anti-twist device 40 of the sealing insert 10 engage in the gaps between the axially parallel locking elements, which are designated by 78.1 and 78.2 for example, of the anti-twist device 76 of the screw connection body 74.

[0085] An inner diameter D of the screw connection body 74 is in particular smaller than a first outer diameter 22 of the sealing insert 10. The sealing insert 10 can thus only be partially inserted into the screw connection body 74, so that a first outer wall section 20 and a first end face 12 of the sealing insert 10 protrude beyond the screw connection body 74. When the pressure screw 72 is screwed onto the screw connection body 74, it presses on the sealing insert 10 and creates a material displacement there, in particular in the region of the first outer wall section 20, for sealing against the corrugated pipe that can be guided through the sealing insert 10.

[0086] FIG. 8 shows the corrugated pipe fitting system 70 from FIG. 7 in a top view of the pressure screw 72.

[0087] FIG. 9 shows the section view IX-IX from FIG. 8The pressure screw 72 has an internal, circumferential pressure contour 73, which presses against the first outer wall section 20 and the first end face 12 of the sealing insert 10 when the pressure screw 72 is screwed onto the screw body 74. Independent of the corrugated pipe (not shown here), in particular within certain dimensional tolerances of a diameter of the corrugated pipe, the pressure screw 72 has a circumferential end face 71, so that the pressure screw 72 can be screwed on until the end face 71 of the pressure screw 72 comes into contact with a stop surface 80 of the screw body 74. In this embodiment, the stop surface 80 is formed by a key contact structure 79 formed on the screw body 74.Such a screw connection is called a block screw connection and has the advantage that accidental loosening, for example due to temperature fluctuations or vibrations, is less likely to occur, since the unspecified thread geometries of the pressure screw 72 and the screw connection body 74 clamp together. Due to the conical design of an inner wall 60 in an upper inner wall section, corresponding to the second inner wall section 66 of the embodiment according to FIGS. FIGS. 1 to 3, the recess 16 of the sealing body 10 allows the material of the sealing body 10 to be pushed up to the corrugated pipe (not shown here) without damaging the corrugated pipe or without resulting in a uniform contact pressure of the sealing element on the corrugated pipe. The sealing insert 10 is deformed under the pressure of the pressure screw 72 and, with regard to its material and dimensions, can advantageously be formed such that a screw connection on a block is possible. The O-ring 84 is arranged in an annular groove (not further designated) below the key contact structure 79 of the screw body 74.

[0088] FIG. 10shows a further, alternative embodiment of the corrugated pipe screw connection system 70. This comprises a pressure screw 72, which can be screwed onto a screw connection body 74 designed as a double nipple, as well as a sealing insert 10, which is two-part, but otherwise similar to the sealing insert 10 according to the FIGS. 4 to 6 For the two-part design of the sealing insert 10, two slits are provided, which are not further designated here. Furthermore, the corrugated pipe fitting system 70 has an O-ring 84, which is applied to the fitting body 74.

[0089] The sealing insert 10 has four internally circumferential ribs 61.1 to 61.4, which are distributed substantially evenly over the entire length 50 of an inner wall 60, which is a significant difference between the sealing insert 10 of this embodiment and that of the FIGS. 4 to 6The sealing insert 10 thus has only a first inner wall section 64. It can also be seen from the illustrated embodiment that the circumferential rib 61.1 is flush with a first end face 12 of the sealing insert 10.

[0090] The proposed corrugated pipe fitting system 70 and the sealing insert 10 used therein differ fundamentally from the fittings for corrugated pipes known from the prior art. In particular, the corrugated pipe fitting system can achieve very high tightness while simultaneously requiring very little installation space. The corrugated pipe fitting system also allows for a direct connection to a connection geometry, such as a housing wall or a connector system, without the need for additional components, as would be necessary with fittings, for example. A corrugated pipe can also be continued inside the corrugated pipe fitting system, so that it protrudes on both sides.This significantly simplifies assembly. In particular, no measuring or precise cutting of the corrugated pipe is required before installing the corrugated pipe with the corrugated pipe fitting system according to the invention, as this can be done after the corrugated pipe fitting system has been installed, if necessary. Furthermore, the sealing effect is improved compared to known corrugated pipe fastening systems, in which a corrugated pipe end is accommodated in a system component and the corrugated pipe thus terminates in the known system, since the end of the corrugated pipe, with its often imperfect cutting edge, and its position within the system component have no influence on the sealing effect of the corrugated pipe fitting system according to the invention. List of reference symbols

[0091] 10 Sealing insert 11 Longitudinal axis 12 First end face 14 Second end face 15 Step 16 Fully continuous recess 18 Outer casing 19 Slot 20 First outer wall section 22 First outer diameter 30 Second outer wall section 32 Second outer diameter 40 Anti-twist device 42 Axis-parallel locking elements 50 Length of the sealing insert 60 Inner wall of the recess 62 Internally circumferential ribs 64 First inner wall section of the recess 66 Second inner wall section of the recess 70 Corrugated pipe screw connection system 71 Circumferential end face of the pressure screw 72 Pressure screw 73 Pressure contour 74 Screw connection body 76 Anti-twist device 78 Axis-parallel locking elements 79 Key contact structure 80 Stop surface 84 O-ring α Flank angle of the locking elements DInner diameter

Claims

1. Sealing insert (10) for a corrugated-pipe screw fastening system (70), comprising - a cutout (16) for receiving a corrugated pipe, - a first and a second end face (12, 14); - a first external wall portion (20) having a first outer diameter (22); and - a second external wall portion (30) having a second external diameter (32); wherein - an internal wall (60) delimiting the cutout (16) comprises at least one partially circumferentially extending rib (62); - the first external wall portion (20) is adjacent to the first end face (12) and extends along a longitudinal axis (11) of the sealing insert (10) up to the second external wall portion (30); - the second external wall portion (30) is adjacent to the second end face (14) and extends along the longitudinal axis (11) up to the first external wall portion (20); - the first outer diameter (22) is larger than the second outer diameter (32); - the first and the second external wall portion (20, 30) are each configured to be cylindrical; - an anti-rotation means (40) is arranged on an outer shell (18) of the sealing insert (10); and - the anti-rotation means (40) is associated with the second external wall portion (30). - the anti-rotation means (40) has a plurality of latching elements (42) formed as grooves and / or ribs, arranged parallel to the longitudinal direction of the sealing insert.

2. Sealing insert (10) according to claim 1, comprising at least two circumferential ribs (62).

3. Sealing insert (10) according to claim 2, wherein the ribs (62) are uniformly spaced apart from one another.

4. Sealing insert (10) according to one or more of the preceding claims, wherein the rib (62) is trapezoidal, rectangular, triangular, arc segment-shaped or at least partially oval in cross-section.

5. Sealing insert (10) according to one or more of the preceding claims, wherein - the internal wall (60) comprises a first internal wall portion (64) and a second internal wall portion (66), - the first internal wall portion (64) comprises the at least one rib (62), - the second internal wall portion (66) does not comprise a rib (62).

6. Sealing insert (10) according to claim 5, wherein the first end face (12) and the second end face (14) are located opposite each other, wherein the first internal wall portion (64) is associated with the first end face (12) or the second end face (14).

7. Sealing insert (10) according to one or more of the preceding claims, wherein at least one rib (62) is flush with the first end face (12) or the second end face (14).

8. Sealing insert (10) according to one or more of the preceding claims, wherein the first end face (12) and the second end face (14) are located opposite each other, wherein the sealing insert (10) comprises at least one slit (19) passing through from the first end face (12) to the second end face (14).

9. Sealing insert (10) according to one or more of the preceding claims, wherein a material thickness of the sealing insert (10) decreases towards the first end face (12) and / or towards the second end face (14).

10. Sealing insert (10) according to claim 9, wherein the material thickness of the sealing insert (10) decreases only in the second internal wall portion (66) towards the first or the second end face (12, 14).

11. Corrugated-pipe screw fastening system (70), at least comprising - a pressing screw (72), - a screw fastening body (74) and - a sealing insert (10) according to one or more of the preceding claims.

12. Corrugated-pipe screw fastening system (70) according to claim 11, wherein the screw fastening body (74) comprises an anti-rotation means (76) corresponding to the anti-rotation means (40) of the sealing insert (10).

13. Corrugated-pipe screw fastening system (70) according to one or more of claims 11 to 12, wherein the screw fastening body (74) comprises a stop surface (80) for the pressing screw (72).

14. Use of a sealing insert (10) according to one or more of claims 1 to 10 in a corrugated-pipe screw fastening system (70) according to one or more of claims 11 to 13 for sealing a corrugated pipe against the corrugated-pipe screw fastening system (70) and for preventing the sealing insert (10) and / or the corrugated pipe from rotating in a screw fastening body (74).

15. Use of a corrugated-pipe screw fastening system (70) according to one or more of claims 11 to 13 for connecting a corrugated pipe to a connection geometry.

16. Method for fitting a corrugated pipe having a plurality of corrugation troughs to a connection geometry, with the steps: - threading a pressing screw (72) onto the corrugated pipe; - inserting the corrugated pipe into the cutout (16) of a sealing insert (10) formed according to one or more of claims 1 to 10 in such a manner that at least one rib (62) is in engagement with a corrugation trough of the corrugated pipe; - inserting a screw fastening body (74) into the connection geometry; - inserting the sealing insert (10) with the corrugated pipe into the screw fastening body (74), wherein the anti-rotation means (40) of the sealing insert (10) is brought in engagement with an anti-rotation means (76) of the screw fastening body (74) and the sealing insert (10) protrudes with the first external wall portion (20) from the screw fastening body (74); and - screwing the pressing screw (72) onto the screw fastening body (74) in such a manner that a material displacement of a material of the sealing insert (10) is created by means of the pressing screw (72), wherein the material rests at least partially sealingly against the corrugated pipe.

17. Method according to claim 16, wherein the pressing screw (72) is screwed on up to a stop surface (80) of the screw fastening body (74).

18. Method according to one or more of claims 16 to 17, wherein the corrugated pipe is inserted into the sealing insert (10) in such a manner that it protrudes beyond the corrugated-pipe screw fastening system on the side of the pressing screw (72) and on the side of the screw fastening body (74) in the mounted state.