DE102017008075B4 - Easy-to-use socket connection to provide a tensile, permanently resilient and detachable pipe connection - Google Patents

Abstract

Socket connection for providing a pipe connection with two pipes (1, 2) that can be pushed into one another, wherein one pipe (1) has a spigot end (3) and the other pipe (2) has a socket (13), wherein a front section (6a) of the spigot end (3) that merges into a middle section (6b) is tapered to form a circumferential first bevel region (7), a rear section (6c) of the spigot end (3) that merges into the middle section (6b) has at least one circumferential first annular groove (8a) on the outside, the rear section (6c) of the spigot end (3) merges into the pipe jacket (12a) of one pipe (1) in a transition region, at which transition region a web (26) extending over the entire circumference with a second abutting edge (9b) is formed, characterized in that a region (20) of the rear section (6c) of the The spigot end (3) is bevelled in longitudinal section towards a front end (11) of the front section (6a) of the spigot end (3) to form a circumferential second bevel region (22), one end of the other pipe (2) is designed as a sleeve (13), in the closed position the second abutting edge (9b) of the spigot end (3) is placed against a sleeve edge (14a) of a front section (13a) of the sleeve (13) facing away from a pipe casing (12b) of the other pipe (2), the front section (13a) of the sleeve (13) has at least one second annular groove (8b) running circumferentially on the inside, in the closed position the spigot end (3) of one pipe (1) is arranged in the sleeve (13) of the other pipe (2) in such a way that the first annular groove (8a) and the second annular groove (8b) face each other with their groove interiors and form an annular channel (16) for receiving a flexible locking cable (17), an opening (14) connected to the groove interior of the second annular groove (8b) is connected to the channel (16) in the closed position for introducing the locking cable (17), the locking cable (17) can be introduced with its one end through the opening (14) into the channel (16) in the closed position, a pin (19) is formed on an outside of the other tube (2) in the area of the opening (14), the pin (19) is coupled to a coupling device at another end of the locking cable (17), a transition area from the front section (13a) into a middle section (13b) of the sleeve (13) is formed on the inside with a limiting shoulder (21) projecting radially inwards and extending in the circumferential direction, the sleeve (13) in the area of its sleeve edge (14a) on the inside to form a circumferential bevel-shaped annular surface (24) is drawn in to the attachment against the second bevel area (22) of the spigot end (3).

Description

The invention relates to an easily handled socket connection for providing a tensile, permanently loadable and detachable pipe connection with two pipes that can be pushed into one another, wherein one pipe has a spigot end and the other pipe has a socket, a front section of the spigot end that merges into a middle section is tapered to form a circumferential first bevel region, a rear section of the spigot end that merges into the middle section has at least one circumferential first annular groove on the outside, the rear section of the spigot end merges into the pipe jacket of one pipe in a transition region, on which transition region a web extending over the entire circumference with a second abutting edge is formed.

Socket pipe connections are known in the state of the art for connecting two pipe ends together. Socket connections are understood to mean, for example, push-in socket connections in which a rubber sealing ring is inserted into the socket and, after the smooth pipe end is inserted into the socket chamber, the radial sealing pressure is achieved by deforming the sealing ring. In the screw socket connection, the rubber sealing ring is pressed in firmly by a screw ring. In the stuffing box socket connection, a rubber sealing ring is pressed into the sealing joint under the pressure of the stuffing box ring like a stuffing box packing.

However, the conventional socket connections mentioned above have the disadvantage that angular deviations of the pipes connected to one another by means of the socket connection are possible and this can lead to leaks. Another disadvantage is that when longitudinal forces are absorbed, the socket connections are compressed, which tends to cause mechanical damage to the socket due to the relative movements of the pipe in the socket to the socket. As a result of the occurrence of longitudinal forces, leaks can also occur when the pipe is pulled out of the socket. The conventional socket connections must therefore be secured accordingly to absorb longitudinal forces.

Socket connections are suitable as connecting elements for two pipe ends at low working pressures or even for pressureless pipes. Threaded sockets are used, for example, for water, gas and district heating pipes with small diameters, but leaks can also occur in these conventional socket connections as a result of longitudinal forces.

When using threadless or star sockets, the pipe end is pushed into the socket and sealed by the soft seal made of rubber, cotton or similar elastic materials, but leaks occur in the gap between the socket and the pipe end located in the socket due to angular deviations of the pipes connected to one another by means of socket connections. These leaks are increasingly exacerbated by the occurrence of radial or tangential forces acting on at least one pipe.

In the prior art, the space between the pipe end inserted into the socket and the inner surface of the socket was knitted or filled with sealing material, but this procedure also shows that the permanent sealing of the socket connection is not guaranteed, especially when transverse forces and longitudinal forces act on the socket connection at the same time.

In the prior art, for example, the use of a rolling rubber sealing ring and a catch ring arranged in an annular groove of the sleeve is proposed for a sleeve or pipe connection, wherein the catch ring consists of several segments held in a ring shape under spring action and which can be moved radially outwards. These segments have bevelled sliding surfaces directed towards the outside of the sleeve for the purpose of inserting the plug-in pipe end with the rolling rubber sealing ring pulled on, and whose front surface directed towards the inside of the sleeve is designed in such a way that when pressure is applied, the segments of the catch ring cannot be moved radially outwards and the rolling rubber sealing ring cannot be pressed out of the sleeve. Providing such a conventional sleeve connection is expensive and also places high demands on the user's skill.

In other conventional socket pipe connections, a catch ring is only subsequently inserted into the ring groove of the socket after the plug-in pipe end with the rolled rubber sealing ring has been pushed into the socket. This usually requires special, expensive tools, so that specialist personnel are required to assemble the conventional socket pipe connections and the provision of the socket connection proves to be time-consuming and very expensive.

A conventional pipe connection for two pipe ends has, for example, claws in the axial direction and two radially aligned openings in the joined pipe ends, which are placed axially butt-to-butt, that partially connect the pipe ends. A claw is inserted into the detachable coupling of the pipe ends, which is U-shaped, with its spaced-apart legs being able to engage in these openings in a form-fitting manner. The disadvantage is that the one-sided force is applied to areas of the pipe ends due to the design of the U-shaped claw, so that the conventional pipe connection tends to crack.

This is how the EN 10 2009 053 696 A1 a connection device is disclosed which is intended for use in motor vehicles and which, for example, has to connect a fresh air system of a motor vehicle for supplying an internal combustion engine of the same to an intake module or filter housing in order to supply the fresh air system with fresh air. The conventional connection device is intended to enable simplified handling, improved displacement protection and, as a result, high reliability in operation. This object is achieved by the conventional connection device, which consists of a tubular plug-in section with a locking element and a connection device with a tubular housing. A locking device with an external stop with an external pocket is arranged on the outside of the housing. The outer end of the locking element is inserted in the pre-assembled state into this receiving pocket, which is designed as an inner groove. The locking element serves to lock the plug-in section inserted into the housing on the housing. For this purpose, the locking element engages on the one hand in the outer groove of the plug-in section and on the other hand in the inner groove of the housing, so that the inner groove and the outer groove of the plug-in section receive the locking element for the purpose of locking and the locking element is locked in the inner groove and the outer groove in the locking position in order to prevent the plug-in section from being pulled out of the housing of the connection device.

As a result of the wedging of the locking element in the inner groove and the outer groove, the locking element is prevented from being moved in the direction of extraction from the housing. In the locked position, the plug section in the connection device is secured against being pulled out, but it turns out that high extraction forces act on the plug section as a result of the vibrations that occur when an internal combustion engine and a motor vehicle are operating, so that although the locking element prevents the plug section from being pulled out of the connection device, the plug section can nevertheless deform as a result of the only locally limited coupling, because only the locking element can hold the plug section in the connection device in a locally limited manner. As a result of the only narrowly limited coupling of the plug section to the connection device, this section is exposed to a high force, so that deformations of the plug section, such as bending, denting, etc., occur, which lead to gaps between the plug section and the housing of the connection device.

Therefore, it is also an object of the invention to provide such a pipe connection which does not provide a locally limited coupling of the plug-in section in the connection device or of one pipe in the other pipe, but rather to equip the two pipes to be coupled with one another with a coupling device in such a way that the forces occurring during vibrations are transmitted in the circumferential direction to both pipes and makes it possible to even out the force transmission instead of the narrowly limited application of force.

The conventional socket connections also show the disadvantage that the pipes connected to one another can still be pivoted against one another, which leads to a leak in the gap between the pipe end inserted into the socket and the bell-shaped socket. Such pivoting also occurs when using loose sockets into which the pipe ends are inserted via their two socket ends.

Particularly when tensile forces occur, the coupling of the pipe end to the socket is not permanently held in a form-fitting manner, so that the force-loaded pulling of the pipe end out of the socket causes considerable leaks, which lead to the escape of liquid from the interconnected pipes and/or to the penetration of media or liquids from the outside into the interior of the pipes.

The object of the invention is to eliminate the above-mentioned disadvantages of the prior art.

Furthermore, a socket connection should be provided to provide a tensile-resistant, permanently load-bearing, detachable pipe connection which, despite the occurrence of tensile forces, permanently provides the positive connection between the pipe end and the socket.

Furthermore, in the presence of tensile forces, not only the form fit between the pipe end and the socket, but also the tightness of the gap between the pipe end and the socket should be permanently maintained.

In addition, the socket connection to be provided should be able to withstand tensile forces that lead to compression in conventional pipe connections The form fit between the pipe end and the socket can be maintained permanently without making it possible to insert the pipe end further into the socket.

The socket connection to be provided should not lead to angular mobility of the pipes connected to each other by means of the socket connection in relation to transverse forces and should permanently prevent the bendability of the pipe ends.

In addition, the socket connection to be provided should enable a reliable fit of the pipe end in the socket regardless of whether the pipes have a large or small cross-section.

Furthermore, a socket connection is to be provided which can be adapted to the various on-site requirements in a cost-effective manner using a modular principle.

The socket connection should also be detachable and reusable without significant modification.

Furthermore, the socket connection to be provided must ensure the tightness of the gap between the outside of the pipe end inserted into the socket on the one hand and the inside of the socket on the other hand when subjected to tensile and compressive stress and must tolerate a certain degree of twistability of the pipe end in the socket.

Furthermore, the socket connection to be provided should be possible both when using loose sockets and when using pipe ends extended to form sockets.

The socket connection to be provided should be permanently resilient and be provided by the inexperienced user.

Finally, the provision of the socket connection should be possible in a cost-effective manner and without a high expenditure of time.

The objects are achieved by the main claim and the secondary claim. The subclaims relate to preferred embodiments and further developments of the invention.

The invention relates to an easy-to-use socket connection for providing a tensile, permanently loadable and detachable pipe connection with two pipes that can be inserted into one another, one pipe having a spigot end and the other pipe having a socket, wherein
a front section of the tip end, which merges into a middle section, is tapered to form a circumferential first bevel area,
a rear section of the spigot end merging into the middle section has at least one circumferentially extending first annular groove on the outside,
the rear section of the spigot ends merges into the pipe casing of one pipe in a transition area, at which transition area a web extending over the entire circumference with a second abutting edge is formed,
a region of the rear section of the spigot end adjacent to the second abutting edge is bevelled in longitudinal section towards a front end of the front section of the spigot end to form a circumferential second bevel region,
one end of the other pipe is designed as a socket,
in the closed position, the second abutting edge of the spigot end is placed against a socket edge of a front section of the socket facing away from a pipe casing of the other pipe,
the front section of the sleeve has at least one second annular groove running circumferentially on the inside,
in the closed position, the spigot end of one pipe is arranged in the socket of the other pipe in such a way that the first annular groove and the second annular groove face each other with their groove interiors and form an annular channel for receiving a flexible locking cable,
an opening connected to the interior of the second annular groove is connected to the channel in the closed position for the introduction of the locking cable,
the locking cable can be inserted with one end through the opening into the channel in the closed position,
in the area of the opening on the outside of the other pipe a tenon is formed,
the pin is coupled to a coupling device at another end of the locking cable,
a transition region from the front section to a middle section of the sleeve is formed on the inside with a radially inwardly projecting limiting shoulder extending in the circumferential direction,
the socket is drawn in on the inside in the area of its socket edge to form a bevel-shaped annular surface running in the circumferential direction towards the attachment against the second bevel area of the spigot end.

Advantageously, the easy-to-handle socket connection can be used to seal tensile, detachable pipe connections.

The pipe connection according to the invention comprises two pipes that can be pushed into one another. One pipe has a pipe end that can also be designed as a spigot end or referred to as such. The middle section of the spigot end is advantageously drawn in on the outside to form at least two recesses that run in a ring around the central longitudinal axis of the pipe and that can at least partially accommodate the sealing rings. The recesses that extend around the outer circumferential surface of the spigot end are designed to be square or partially circular, such as semicircular, in longitudinal section, for example.

The front area of the spigot end of one pipe, which merges into the middle area of the spigot end, preferably has a conical or tapered outer side on the outside. The area of the spigot end that is bevelled towards the front end of the spigot end or drawn in towards the interior of the same is referred to as the first bevel area. This area of the front section of the spigot end that is bevelled or inclined towards the interior rests against part of the inside of the sleeve in the closed position. A second bevel area of the rear section of the spigot end can adjoin a second abutting edge and, like the first bevel area, can be bevelled or inclined, drawn in towards the interior of the same.

The rear section of the spigot end, which merges into the middle section, is drawn in on the outside in such a way that at least one first annular groove is formed that runs around the outside in the circumferential direction. The first annular groove can be semicircular or angular in longitudinal section. The first annular groove also runs in a circle around the central longitudinal axis of one pipe. Other longitudinal section shapes of the first annular groove in addition to the semicircular shape are also possible, which depend on the cross-sectional shape of the locking cable to be accommodated in the closed position. The rear section of the spigot end merges into the pipe jacket of one pipe. In the transition area from the rear section to the pipe jacket of one pipe, a web is formed, for example, which extends over the entire circumference of one pipe. In the sense of the invention, extending in the circumferential direction is also understood to mean extending around the central longitudinal axis of one pipe or part thereof or over the entire circumference of a pipe or part thereof.

Since in the closed position of the socket connection according to the invention the groove channel formed by the first annular groove and the second annular groove accommodates the flexible locking cable, the locking cable located in the channel presses against the annular grooves evenly in the circumferential direction due to its positive engagement against the first annular groove of the spigot end and the second annular groove of the socket, which laterally limit the annular channel, so that the pulling out of one pipe from the other is prevented. The pulling out forces are transmitted by the locking cable to the spigot end and the socket in an even manner, so that in contrast to the prior art, deformations of the pipes, such as kinking, dents, etc., and gaps between the spigot end and the socket do not occur. The disadvantages of narrowly limited force application by the conventional connection device are effectively avoided.

The web, which also runs in a circle around the central longitudinal axis, has, for example, an abutting edge, which is referred to as the second abutting edge. The second abutting edge serves to attach to a part of the inside of the sleeve in the closed position. In the sense of the invention, abutting edge is also understood to mean a protruding edge or strip, which can be angular in longitudinal section.

An area of the rear section of the spigot end that borders on the second abutting edge is beveled or inclined towards the front end of the front section of the front end, forming a second beveled area that also runs all the way around. In the sense of the invention, a beveled area is also understood to mean a bevel that can extend interruptedly or continuously in the circumferential direction - around the pipe - and can be drawn in towards the interior of a pipe or part of it. In the closed position, the second beveled area also rests against part of the inside of the sleeve. In a transition area from the front section to the middle section of the spigot end, a first abutting edge that extends over the entire circumference is formed on the outside and also serves to rest against the inside of the sleeve in the closed position.

One end of the other pipe has a, preferably tubular, sleeve. The sleeve can be bell-shaped or hood-shaped. The sleeve can also be loose, into the ends of which the pipe ends can be inserted. The inside of the front section of the sleeve has at least one second annular groove running around the circumference, which can be partially circular, such as semicircular, or angular in longitudinal section, for example. The second annular groove, like the first annular groove, runs in a circle around the central longitudinal axis of the other pipe. In the closed position, the first annular groove is brought into line with the second annular groove to form a channel which serves to accommodate the locking cable via the opening. The channel is advantageously adapted to the cross-sectional profile of the locking cable.

A part of the inside of the front section of the sleeve facing a sleeve edge is drawn in towards the outside to form a circumferential bevel-shaped annular surface which, in the closed position, serves to be placed against the second bevel area of the spigot end. The sleeve edge of the sleeve as the front end of the same is placed against the second abutting edge of the spigot end in the closed position.

In the area of the second annular groove, an opening is made in the sleeve, which preferably extends perpendicular to the central longitudinal axis of the other pipe or the sleeve. The interior of the second annular groove is connected to the opening, so that in the closed position the locking cable is inserted from the outside into the channel formed by the first and second annular grooves via the opening. In the closed position the channel formed by the first annular groove and the second annular groove has an inner diameter, for example, which can essentially match the outer diameter of the locking cable. Likewise, the inner diameter of the channel can match or largely match the inner diameter of the opening in order to make it easier to insert and remove the locking cable.

A pin is arranged in the area of the opening, to which the other end of the locking cable is coupled after insertion, e.g. by means of an eyelet, or to the conventional coupling device attached to it. The coupling device can be a conventional screw connection, rivet connection, eyelet or the like. The pin can be used to couple one end of the locking cable.

A transition area from the front section to the middle section of the sleeve is formed on the inside with a limiting shoulder that projects radially inwards and extends in the circumferential direction. In the closed position, the limiting shoulder is placed against the first abutting edge of the spigot end. In the sense of the invention, a limiting shoulder is also understood to mean a protruding edge or strip that can be angular in longitudinal section.

For the purposes of the invention, the closed position also means the joining of pipe and socket, such as the spigot end of one pipe being inserted into the socket of the other pipe.

In the sense of the invention, a sleeve can also be understood as a loose sleeve into which two spigot ends of the pipes can be inserted. In the sense of the invention, a sleeve can also be understood as the hood- or bell-shaped expansion of the pipe end of one pipe or of the other pipe or a pipe end without expansion.

The middle section of the spigot end is drawn in on the outside to form at least two ring-shaped recesses running around the outside to at least partially accommodate sealing rings. The middle section of the socket is also drawn in on the inside to form at least two ring-shaped recesses running around the outside to at least partially accommodate the sealing rings. In the closed position, the recesses are opposite each other and form a common interior space to accommodate e.g. 2 sealing rings.

In one embodiment of the socket connection according to the invention, one pipe contains an austenitic material with high thermal expansion and the other pipe contains ferritic material.

In a further embodiment of the sleeve connection according to the invention, the locking cable is a strand made of braided and/or twisted metal threads or a one-piece, e.g. solid, wire. The locking cable can also comprise several braided and/or twisted strands arranged around a core or heart, wherein the core, around which, e.g. five, strands can be arranged, can have a sealing material or a plastic mass, which additionally serves to seal the gap between the outside of the spigot end and the inside of the sleeve.

Depending on the load of the material and the pressure acting on the socket connection, several channels can be formed through the ring grooves to accommodate locking cables.

Conventional plastic-like materials are suitable as sealing material or plastic mass, such as foam resins, which can contain at least one representative of the group comprising polyurethane compounds (PUR), epoxy compounds (EP), such as epoxy resins, foam plastics, such as polystyrenes (PS), styrene copolymers, polymethacrylimides, urea resins (UF foams), polyamides, etc., which can be suitable for injection.

In a further embodiment of the socket connection according to the invention, one end of the locking cable can be tapered to make it easier for the user to insert it into the channel via the opening. The other end of the locking cable is connected to the coupling attached to the pin. device, for example by means of a screw connection.

In addition, a screw can be screwed into the socket of one end of the other pipe from the outside via an internal thread in the closed position in such a way that the screw engages in the spigot end, e.g. with its screw tip in an external recess of the spigot end running in the circumferential direction, in a frictional, force-fitting and/or positive manner and can fix the two pipes in the closed position in their alignment with one another and serve as additional security.

The socket connection according to the invention is characterized by the avoidance of angular deviations of the pipes when transverse forces occur that can act against at least one pipe. Even when tensile forces occur, the spigot end remains permanently in the socket.

The socket connection according to the invention is an inexpensive, quickly assembled, safe, detachable and pressure-resistant pipe plug connection and can be provided according to the modular principle. The advantages over conventional flange pipe connections are characterized by
Material savings of approx. 90% compared to conventional flange connections,
Savings of 90% in assembly costs,
Reusability of the socket connection according to the invention due to the modular principle,
Elimination of welding, thus avoiding the risk of explosion,
the cost-saving adaptability to the various local requirements in the form of a modular principle,
the easy detachability and reusability without significant modification and
the easy-to-ensure locking position using a screw and locking rope.

Depending on the load on the material of the socket connection according to the invention and the pressure acting on the socket connection, modular systems can also be used which have several channels formed by the annular grooves for the purpose of accommodating several locking cables.

Furthermore, the socket connection according to the invention is suitable for any media and can be used for materials such as metal, plastic, etc. The socket connection according to the invention is an inexpensive, quickly assembled, safe, quickly detachable, pressure-resistant pipe plug connection and can be used as a pipe system according to the modular principle. The advantages of the socket connection according to the invention compared to conventional flange pipe connections are very great, due to
Usability for all media-carrying pipes,
Manufacturing with steel, stainless steel and/or plastics,
Can be used and installed up to DN 400 and larger,
easy and quick assembly without expert user,
Usability of one or more strands,
high level of security due to easier controllability,
high degree of pressure tightness due to the O-ring seal compared to conventional flat seals,
simplified production of spigot and socket by, for example, welding the socket to the pipe casing.

The spigot end can be easily and smoothly inserted into the socket. The tapered front section of the spigot end as the first bevel area makes it easier to insert it into the socket.

The second chamfer area adjacent to the second butt edge and the chamfered ring surface located in the area of the socket edge facilitate the positive centering of the spigot end in the socket and absorption of the axial and radial forces.

Due to the positive interaction between the bevelled outside of the spigot end and the bevelled inside of the socket, the sealing rings always have the same distance in the socket and are evenly loaded. This ensures tightness and durability.

The sealing part is followed by the safety part, which is slightly larger in diameter. The diameter is chosen to be larger so that the seals are not damaged during assembly and disassembly and can be inserted into the sealing part without touching the safety part. Another advantage is that the connection can be put together more easily because the sliding path is very short. This means that larger diameters can be manufactured and assembled. The safety part is chosen so that one or more strands can be accommodated. At the end of the safety part there is a small cone which serves for precise centering and absorbs the axial and radial forces. After the pressure has been calculated, the number and diameter of the required grooves for the strands are screwed in to ensure a precise fit.

The sleeve is designed according to the construction of the nipple so that the nipple can be easily inserted and the corresponding cone of the nipple fits precisely and can absorb the axial and radial forces.

The diameter of the locking part of the sleeve is adapted to the dimensions of the nipple and rotated accordingly, including the precisely fitting cone for centering and absorbing the axial and radial forces of the locking part.

For safety reasons, the opening is milled tangentially into the sleeve according to the diameter of the locking cable. The spigot is inserted into the sleeve as far as it will go and aligned and is screwed and secured using a prefabricated, precisely fitting cover on the threaded pin with a self-locking nut.

The fuse can be checked at all times and this gives you 100% certainty that everything is secured and can be constantly monitored (absolute, controllable security that no fuse has been forgotten or is loose).

With the socket connection according to the invention, pipe laying can be carried out more quickly and much more safely and cost-effectively without complex welding work on site.

The socket joint according to the invention enables the laying and dismantling of pipes within a few hours; moreover, the socket joint according to the invention can be designed for pressures of 450 bar, in contrast to conventional pipe joints, whereby conventional pipe joints are only designed for pressures of less than 160 bar.

The socket connection according to the invention is also easy and quick to install without placing great demands on the operating personnel. This means that the use of specialists is not necessary. The locking cable can consist of one or more strands and can be pulled out and reinserted for inspection if necessary. The pressure tightness is ensured by the sealing rings located in the recesses and is characterized by a high degree of tightness compared to flat seals in conventional pipe connections. Welding the spigot or nipple of the socket to the pipes eliminates the need to align the parts with each other.

The socket connection according to the invention can be attached to ball valves and fittings. Providing the socket connection according to the invention does not require any special tools, so that the provision costs are very low. When providing the socket connection according to the invention, it is sufficient to align the spigot end with the socket by twisting so that the two annular grooves are arranged one above the other to form a channel.

Examples of implementation

• 1 die Draufsicht auf die erfindungsgemäße Muffenverbindung,
• 2 Längsschnitt durch das Spitzende des einen Rohres,
• 3 die Draufsicht auf das Spitzende des einen Rohres und
• 4 die Draufsicht auf das in Schließstellung befindliche Spitzende in der Muffe der erfindungsgemäßen Muffenverbindung.

Due to a simplification of the drawings, they show schematically and greatly enlarged, without claiming to be a true-to-scale reproduction in

• 1 the top view of the socket connection according to the invention,
• 2 Longitudinal section through the spigot end of one pipe,
• 3 the top view of the spigot end of one pipe and
• 4 the top view of the spigot end in the closed position in the socket of the socket connection according to the invention.

The spigot end 3 of one pipe 1 is designed in a step-like manner, so that the outside diameter increases from the front section 6a to the rear section 6c of the spigot end 3. The front area of the first section 6a of the spigot end 3 of one pipe 1 is conical on the outside and forms a circumferential first bevel area 7. The first section 6a merges into the middle section 6b, which is drawn in to form two annular recesses 4 that are aligned parallel to one another and run around the circumferential surface of the outside of the spigot end 3. The middle section 6b merges into the rear section 6c in a transition area. The transition area is designed with a second abutting edge 9b that extends circumferentially. In the sense of the invention, abutting edge is also understood to mean an edge that is angular, such as rectangular, in longitudinal section. The rear section 6c of the spigot end 3 is also drawn in to form a first annular groove 8a, which is semicircular in longitudinal section. This longitudinal section shape is particularly suitable for receiving the locking cable 17, which is round in cross section, in the closed position. The rear section 6c merges into the pipe casing 12a of one pipe 1 in the transition area. A web 26, which also extends in the circumferential direction and has a second abutting edge 9b facing the front section 6a, is formed on the transition area.

A region 20 of the rear section 6c of the tip end 3 adjacent to the second abutting edge 9b is tapered so that it is bevelled, i.e. inclined, in longitudinal section towards a front end 11 of the front section 6a of the tip end 3 and provides a circumferential second bevel region 22.

The socket 13 is bell-shaped and goes into a pipe jacket 12b of the other Pipe 2. A part of the front section of the sleeve 13 facing the sleeve edge 14a is tapered in longitudinal section. The inner part is drawn in towards the outside to form a circumferential bevel-shaped annular surface 24 which, in the closed position, serves to engage against the second bevel region 22 of the spigot end 3. In another embodiment, the inside of the sleeve 13 is partially widened outwards in the region of the sleeve edge 14a, at least in longitudinal section, to form a bevel-shaped annular surface 24 which facilitates the positively locking predetermined positively locking reception or insertion of the spigot end 3.

In the closed position, the bevel-shaped ring surface 24 lies flat against the second bevel area 22 of the rear section 6c of the spigot end 3. The inside of the front section 13a of the sleeve 13 is drawn in to form a second ring groove 8b. In the closed position, the spigot end 3 and the sleeve 13 are joined together in a form-fitting manner by inserting the spigot end 3 into it, so that the two ring grooves 8a, 8b face each other and together form a channel 16 composed of the groove interiors of the ring grooves 8a, 8b, which serves to accommodate a locking cable 17.

The front section 13a of the sleeve 13 merges into a middle section 13b of the same, the inside of which is also drawn in to form two ring-shaped recesses 4 extending over the entire circumference of the same. In the closed position, the recesses 4 of the spigot end 3 and the recesses 4 of the sleeve 13 are aligned with each other and are opposite each other so that these 4 form a common interior space which accommodates sealing rings 5 and provides a permanent seal for the gap between the inside of the sleeve 13 and the outside of the spigot end 3.

The middle section 13b of the sleeve 13 merges into the rear section 13c of the sleeve 13, which is tapered in longitudinal section to form a circumferential bevel-shaped annular surface 24, which is placed face to face against the first bevel area 7 of the spigot end 3. In the closed position, a locking cable 17 is inserted through an opening 14 that is led through the sleeve 13 and makes the channel 16 accessible to the outside, with one tapered end making it easier to insert the same. The locking cable 17 is inserted far enough that the pointed end of the locking cable 17 comes to a stop against the one already inserted or can be led out through another opening. The other end of the locking cable engages with a conventional screw connection so that during maintenance or when changing from the closed position to the open position, the locking cable can be pulled out of the opening 14 and the channel 16 and the tubes 1, 2 can be spaced apart from each other.

Further advantages of the socket connection according to the invention

The socket connection according to the invention is characterized by
the permanent form fit between the pipe end and the socket when tensile forces occur,
the tightness of the gap between the pipe end and the socket in the closed position in the presence of tensile forces,
the permanent form fit between pipe end and socket in the presence of compression due to the action of tensile forces,
no angular mobility of the pipes connected by means of socket connections against transverse forces,
the reliable fit of the pipe end in the socket regardless of large or small cross-section pipes,
the tightness of the gap despite the ability of the pipe end to rotate in the socket,
the use in the form of loose sleeves or pipe ends extended to sleeves,
the permanent resilience,
use by the inexperienced user,
cost-saving production without high time expenditure.

Claims (18)

Socket connection for providing a pipe connection with two pipes (1, 2) that can be pushed into one another, wherein one pipe (1) has a spigot end (3) and the other pipe (2) has a socket (13), wherein a front section (6a) of the spigot end (3) that merges into a middle section (6b) is tapered to form a circumferential first bevel region (7), a rear section (6c) of the spigot end (3) that merges into the middle section (6b) has at least one circumferential first annular groove (8a) on the outside, the rear section (6c) of the spigot end (3) merges into the pipe jacket (12a) of one pipe (1) in a transition region, at which transition region a web (26) extending over the entire circumference with a second abutting edge (9b) is formed, characterized in that an area (20) of the rear section (6c) of the The tip end (3) is bevelled in longitudinal section towards a front end (11) of the front section (6a) of the tip end (3), as shown in FIG. formation of a circumferential second bevel region (22), one end of the other pipe (2) is designed as a sleeve (13), in the closed position the second abutting edge (9b) of the spigot end (3) is placed against a sleeve edge (14a) of a front section (13a) of the sleeve (13) facing away from a pipe casing (12b) of the other pipe (2), the front section (13a) of the sleeve (13) has on the inside at least one second annular groove (8b) running circumferentially, in the closed position the spigot end (3) of one pipe (1) is arranged in the sleeve (13) of the other pipe (2) in such a way that the first annular groove (8a) and the second annular groove (8b) face each other with their groove interiors and form an annular channel (16) for receiving a flexible locking cable (17), an opening (14) connected to the groove interior of the second annular groove (8b) with the channel (16) is connected in the closed position for the introduction of the locking cable (17), the locking cable (17) can be introduced with its one end via the opening (14) into the channel (16) in the closed position, a pin (19) is formed on an outer side of the other pipe (2) in the region of the opening (14), the pin (19) is coupled to a coupling device at another end of the locking cable (17), a transition region from the front section (13a) into a middle section (13b) of the sleeve (13) is formed on the inside with a limiting shoulder (21) projecting radially inwards and extending in the circumferential direction, the sleeve (13) is drawn in on the inside in the region of its sleeve edge (14a) to form a chamfer-shaped annular surface (24) running all the way around in the circumferential direction for attachment to the second chamfer region (22) of the spigot end (3). Socket connection to provide a pipe connection according to Claim 1 , characterized in that the spigot end (3) of one pipe (1) has in its middle section (6b) at least two annular recesses (4) running around in the circumferential direction for receiving sealing rings (5) on the outside, the opening (14) is connected to the groove interior of the second annular groove (8b), the middle section (13b) of the sleeve (13) has at least two annular recesses (4) running around the outside for receiving sealing rings (5). Socket connection to provide a pipe connection according to Claim 2 , characterized in that in the closed position the at least two recesses (4) are opposite each other and form common interior spaces for receiving the at least two sealing rings (5). Socket connection for providing a pipe connection according to one of the preceding claims, characterized in that in the closed position the spigot end (3) and the socket (13) are joined together in a form-fitting manner by inserting the spigot end (3) into the latter, so that the two annular grooves (8a, 8b) face each other and together form the channel (16) composed of the groove interiors of the annular grooves (8a, 8b), which serves to receive the locking cable (17). Socket connection for providing a pipe connection according to one of the preceding claims, characterized in that the opening (14) is aligned perpendicular to a central longitudinal axis (A) of the other pipe (2) or tangentially to the tubular socket and a screw can be screwed into the socket (13) of one end of the other pipe from the outside, which screw is connected in the closed position to the spigot end (3) of one pipe in a frictional, force-fitting and/or positive manner to fix the closed position. Socket connection to provide a pipe connection according to Claim 5 , characterized in that the screw is screwed into the sleeve (13) of one end of the other pipe (2) from the outside in the closed position via an internal thread such that the screw engages in the spigot end (3), preferably with its screw tip in an external recess of the spigot end (3) running in the circumferential direction, in a frictional, force-fitting and/or positive manner and fixes the two pipes (2, 3) in the closed position in their alignment with one another and serves for additional security. Socket connection for providing a pipe connection according to one of the preceding claims, characterized in that in the closed position the channel (16) formed by overlapping annular grooves (8a, 8b) has a clear width which corresponds to that of the opening (14). Socket connection for providing a pipe connection according to one of the preceding claims, characterized in that the locking cable (17) contains a braided material and is circular in cross-section, preferably as a one-piece, in particular as a wire, is circular in cross-section. Socket connection for providing a pipe connection according to one of the preceding claims, characterized in that the socket is smooth on the inside. Socket connection for providing a pipe connection according to one of the preceding claims, characterized in that in the closed position the pin (19) is coupled to a coupling device at another end of the locking cable (17). Socket connection for providing a pipe connection according to one of the preceding claims, characterized in that the web (26) running circularly around the central longitudinal axis (A) has the second abutting edge (9b), wherein the second abutting edge (9b) serves to abut against a part of an inner side of the socket (13) in the closed position. Socket connection to provide a pipe connection according to Claim 11 , characterized in that the second chamfer region (22) rests against a part of the inside of the sleeve (13) in the closed position. Socket connection to provide a pipe connection according to Claim 11 or 12 , characterized in that a part of the inner side of the front section (13a) of the sleeve (13) facing a sleeve edge (14a) is drawn in towards the outer side to form a circumferential bevel-shaped annular surface (24) which, in the closed position, serves to engage against the second bevel region (22) of the spigot end (3). Socket connection for providing a pipe connection according to one of the preceding claims, characterized in that the front region of the first section (6a) of the spigot end (3) of one pipe (1) is conical on the outside and forms the circumferential first bevel region (7). Socket connection for providing a pipe connection according to one of the preceding claims, characterized in that the socket (13) is bell-shaped or hood-shaped. Socket connection for providing a pipe connection according to one of the preceding claims, characterized in that at a transition region from the front section (6a) to the middle section (6b) of the spigot end (3) a first abutting edge (9a) extending over the entire circumference is formed on the outside, which serves to attach against the inside of the socket (13) in the closed position. Socket connection to provide a pipe connection according to Claim 16 , characterized in that in the closed position the limiting shoulder (21) is placed against the first abutting edge (9a) of the spigot end (3). Socket connection to provide a pipe connection according to Claim 16 or 17 , characterized in that in the closed position the first abutting edge (9a) of the spigot end (3) is placed against the limiting shoulder (21) of the sleeve (13), the first bevel region (7) of the spigot end (3) is placed against the rear section (13c) of the sleeve (13) facing a sleeve base (41) of the sleeve (13) and the second bevel region (22) is placed against the annular surface (24).

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