EP2573878A1 - Connection element for a connector - Google Patents

Abstract

The element e.g. bushing (24), has a connection piece (15) including a front sided chamber (17) with a connection contact (19) on a front side, and a connection sleeve (20) with an outer thread or outer pattern (26) on a rear side. A hollow cylindrical intermediate element (50) includes a connecting part (52) with an inner thread or inner pattern (54) on a front side, and another connecting part (58) with a passage channel (66) on a rear side. The parts correspond to the sleeve and a coupling nut (30), respectively. An electrical line is guided through the channel at the contact. The element includes an annular sealing made of rubber or soft plastic.

Description

The present invention relates to a connecting element, in particular a plug or a socket, for a connector and a connector with two such fasteners.

For connecting electrical devices that serve the generation, transmission or use of electrical energy, connectors are usually used with two connecting elements, namely a plug and a corresponding socket. Through a connector, e.g. two electrical cables or lines, such as a supply line connected to a supply network and a connected to an electrical load or generator connecting cable are interconnected. The connectors used allow it to selectively connect electrical lines with each other and to solve each other again.

A connector of this type, which is intended for outdoor use of solar systems, is from the published patent application DE 10 2008 045 801 A1 known. The connector is formed by a socket and a connector connected thereto, each having a contact carrier, in which a contact pin or a contact socket is held. The contact carrier takes the end of a cable seal with a strain relief claw. The strain relief claw acts together with a pressure screw to decouple tensile and compressive forces acting on a cable from the contact pin.

Contact pins or contact sockets usually have a detent spring, which at a central part of the contact pin or the contact socket is attached. These detent springs are elaborately designed and therefore expensive to manufacture. To accommodate the detent spring, the middle part of the contact pin is extended, whereby additional material is needed, which causes considerable costs in the usual high quantities.

Photovoltaic systems usually include a plurality of solar panels, by means of which electrical energy is generated. These solar panels have outgoing cable sets, which eventually lead the generated electrical energy through various technical facilities to a grid transfer point. For reasons of ease of assembly, it is now common to equip the solar panels, as well as the associated lines, which dissipate the electrical energy with a connector. With regard to operational safety, high demands are placed on the reliability of these connectors. For example, the connectors have to withstand all the weather and environmental conditions that occur on site for a very long period of time, eg 20-30 years. Here are high electrical and mechanical requirements to meet. So should the lowest possible electrical contact resistance at the connector occur over the entire life, so that the transfer of the total power of the solar system is not adversely affected. If an increased contact resistance occurs, an operational failure, possibly a fire or further damage may occur in individual cases. In addition to an increased contact resistance and leakage currents are to be avoided, which can form in particular under the influence of moisture and impurities.

For the reasons mentioned, the connecting elements of a connector, namely plug and socket, often already pre-assembled in the factory and firmly connected to a cable and delivered as a so-called "overmold connector". Often, however, it is also necessary to mount a plug on site on the cable. This, for example, if the length of the electrical line was previously unknown or if a defective connector must be replaced. In these cases, a plug-in connector must be installed on site, which complies with the approval and safety requirements of the relevant standards as well as the factory-mounted plug-in connectors.

For the assembly of such connectors on site, the installer usually requires several tools. Typically, special devices must be used to check that an intended position of the connection contact has been reached.

The present invention is therefore an object of the invention to provide a connecting element, in particular a plug or a socket, for a connector and a connector with a plug and a socket which meet the high security requirements unabated even in the packaging on site.

The inventive fasteners and connectors should allow single or multi-wire cables to connect with each other and optionally again to solve each other.

In particular, easily manageable fasteners are to be created, in which the disadvantages described above, in particular the complex assembly and testing on site, are avoided.

Furthermore, the cost of materials for contact pins or contact sockets and for detent springs should be reduced, which are used in the fasteners.

This object is achieved with a connecting element for a connector, a plug or a socket, as well as with a connector with mutually corresponding connecting elements, which have the features specified in claim 1 or 14 features. Advantageous embodiments of the invention are specified in further claims.

The connector provided for connecting element, namely a plug or a socket, which are advantageously used in solar systems, comprises a connecting piece, which has a chamber front side with at least one connector provided therein for an electrical line and the rear a connection sleeve with an external thread or an external grid. In addition, the connecting element comprises a union nut with an internal thread and an opening of the electrical line serving.

According to the invention, an at least approximately hollow cylindrical intermediate element is provided, which has a first connection part corresponding to the connecting sleeve with an internal thread or an inner grid and the rear a corresponding nut to the second connecting part with an external thread and a passageway through which the electrical line to the terminal contact can be guided.

With the help of the intermediate element, the person skilled in the art manages to assemble a plug-in connector on site which satisfies the high safety requirements unimpeded. In particular, in a compact design of the fasteners safety-relevant regulations in terms of clearance and creepage distances optimally met. The connection piece separated from the intermediate element serves to receive the connection contact. The front provided first connecting part of the intermediate element can be typically connected in a simple manner positively to the external thread of the connector. The rear-provided second connecting part preferably has an external thread, which serves to receive the union nut. Preferably, the second connecting part of the intermediate element is configured such that when tightening the nut simultaneously results in a positive connection with the electrical line.

In a preferred embodiment, the intermediate element on the front side has an insulating cylinder aligned coaxially with it within the first connecting part, which preferably adjoins the at least one connecting contact within the connecting sleeve. At the end or adjacent to the terminal contact, the insulating cylinder has a broadening in the manner of a directed against the terminal contact foot element. The foot element is preferably located after mounting on a reinforcing ring, which is integrally formed on the terminal contact. As a result, the terminal contact is held in the intended position.

The isolation cylinder holds the terminal contact in the predetermined position within the connector. On the metal connectors often used in known connectors, which are embedded or attached to the connection contact, can be dispensed with. Since no metal clips are used in the inventive connecting element, the terminal contact can also in a simple manner and without additional tools when needed back out of the Connection piece to be removed. In addition, it is not necessary to check the engagement of the metal spring and thus the correct positioning of the connection contact within the connector, which is why regularly occurring undesirable consequences of this test accounts. Often, the check of the correct latching namely by a short vigorous pulling movement on the connected to the plug or the socket electrical line, which, however, a great burden on the connection between the line and the terminal contact result and occasionally damage the connector or the created Connection leads.

In a further preferred embodiment, the second connecting part of the intermediate element forms a lamella basket provided with an external thread, which can be pressed together. As a result, a frictional connection to the electrical line can be generated, which serves for the strain relief. In addition, a seal is created by the compressed lamellar basket, are limited by the electrical clearance and creepage distances.

The wall thickness of the insulation cylinder is selected either uniformly or in such a way that it rises against the front side in the region of the at least one connection contact. By a uniform wall thickness, an electrical line can be inserted in the passage of the insulation cylinder, while the intermediate element can be inserted into the connector sleeve. By increasing the wall thickness in the front region of the insulation cylinder, the connection contact can be held in the predetermined position within the connection piece and prevents the connection contact from slipping off through the insulation cylinder.

In a further preferred embodiment, a preferably annular seal is arranged on the front side on the connecting sleeve, which is enclosed between the first connecting part and the insulating cylinder of the intermediate element. For example, a seal made of rubber or a soft plastic is provided. Within the second connecting part of the intermediate element, a cable sealing ring is preferably provided.

The intermediate element is preferably dimensioned such that the distance between the terminal contact and the seal and / or the distance between the terminal contact and the cable sealing ring is at least 5 mm, preferably at least 10 mm. By using rubber or a soft plastic, the tightness of gases and liquids for the connector specified in safety standards can be achieved. This prevents inter alia that corrosion can occur inside the connecting element. The positions of the annular seal and the cable seal ring determine the clearance and creepage distances that are essential for compliance with safety regulations.

In further embodiments, the internal thread or the inner grid of the first connecting part on the one hand and the external thread of the second connecting part of the intermediate element on the other hand to each other divergent or corresponding thread diameter.

When using diverging thread diameters the installation of the intermediate element is mandatory for the connection of the union nut with the connection sleeve. It is therefore ensured that the connecting element is not assembled incorrectly. For example, in the case of a wrongly assembled connection element, the connection contact would not held by the isolation channel on the intermediate element in the intended position in the connector. Which would not comply with specified creepage distances and clearances.

In the case of corresponding thread diameters, the union nut can optionally also be connected directly to the connection piece or its connection sleeve. The connector can therefore be used universally with or without intermediate element, if the safety requirements are reduced.

In a preferred embodiment, the connecting piece and / or the intermediate element consist at least partially of modified polyphenylene ether (PPE). Relatively inexpensive PPE allows the use of the connection element under adverse environmental conditions, above-average high or low temperatures or UV irradiation. At the same time, a PPE link remains fully operational over a period of 25 years or more.

In a preferred embodiment, a recess or indentation is provided on the internal thread of the intermediate element and a latching body is provided on the external thread of the connection sleeve, which are formed complementary to one another and form a laying device. By appropriate dimensioning of the detent body is defined how strong the intermediate element can be tightened to the connector. It is both too strong tightening, in which damage to the connector due to the high torque is to be feared, as well as too weak tightening, in which parts of the connector could solve prevented. In addition, it can also be achieved that, for example, a company logo on the intermediate element lies opposite the connection piece in a predetermined position. The complementary shape allows reliable engagement of the two locking elements. It should preferably no freedom of movement between the intermediate element and the connector remain.

In a preferred embodiment, the notch is preferably less than a quarter turn (π / 2) away from the outer end of the internal thread of the intermediate element. Due to the proximity of the notch to the end of the thread of the opposite locking body when closing the connection is not excessively abraded by the friction on the internal thread of the intermediate element.

In a further preferred embodiment, the notch has an opening flank extending at least approximately perpendicularly to the direction of rotation, against which the detent body strikes in the opening direction when the intermediate element is rotated. In addition, the indentation has a Zudrehflanke on which the locking body is present when rotating the intermediate element in the closing direction and which at least partially has a wedge surface which is inclined at an angle in the range of 30 ° - 60 °, preferably 45 ° to the direction of rotation. The opening flank prevents opening of the connector without the aid of a tool, after the intermediate element and the connecting piece have been screwed together until the locking elements engage in one another. The vertical edge of the notch generates when turning in the opening direction a large resistance to the also vertical edge of the detent body. The second flank of the notch indicates to the person skilled in the art, when the connecting piece and the intermediate element are wound together, when a sufficiently stable connection between the two parts has been achieved. Thus, too strong a twisting of the connection is prevented, which is why an excessive deformation of the sealing ring, which is located between the two parts, is avoided. A splintering of the plastic Applying excessive torque can also be prevented. So that the flank of the locking element is not destroyed in a possible short over-rotation, a wedge surface is preferably provided which prevents breakage of the flank and allows a safe turning back into the intended position.

In preferred embodiments, the locking body has a length in the range 1mm - 10mm, preferably 3mm - 5mm and a width in the range 0.5mm - 3mm and a height in the range 0.3mm - 2mm. By choosing the size of the detent body can be provided that this can accommodate a predetermined force or torque both when turning and when opening the connection between the connector and the intermediate element. It is preferably provided that the connection piece and the intermediate element can not be separated from each other without tools. For example, it is provided that the locking elements can absorb a torque of at least 10Nm. In practice, values of 40-60 Nm have proven to be expedient. Depending on the selected dimensioning of the locking elements, the connecting piece and the intermediate element, after the two locking elements engage with each other, no longer be separated from each other, without causing any of the two locking elements is damaged. As a result, a kind of sealing of the connecting element is achieved, the damage indicates an unauthorized opening of the connection.

Fig. 1

in Explosionsdarstellung ein erfindungsgemässes Verbindungselement, nämlich eine Buchse 24, die ein Anschlussstück 15 mit einem darin eingelassenen Anschlusskontakt 19, eine Dichtung 28, ein Zwischenelement 50 mit einem darin eingelassenen Kabeldichtungsring 64 sowie eine Überwurfmutter 30 umfasst;

Fig. 2

die zusammengesetzte und an eine elektrische Leitung 12 angeschlossene Buchse 24 von Figur 1 in einer seitlichen Darstellung und einer Schnittdarstellung;

Fig. 3

ein weiteres erfindungsgemässes Verbindungselement, nämlich ein Stecker 22 in einer seitlichen Darstellung und einer Schnittdarstellung;

Fig. 4

der Stecker 22 von Figur 3, mit vom Anschlussstück 14 getrenntem Zwischenelement 50 in einer räumlichen Darstellung;

Fig. 5

das Zwischenelement 50 des erfindungsgemässen Verbindungselements sowie eine Detailansicht einer am Zwischenelement 50 vorgesehenen Einkerbung 70;

Fig. 6

das Anschlussstück 18, des erfindungsgemässen Verbindungselements, nämlich eines Steckers 22, sowie eine Detailansicht eines am Stecker 22 vorgesehenen Rastkörpers 80;

Fig. 7

das Anschlussstück 19 des erfindungsgemässen Verbindungselements, nämlich einer Buchse 24, sowie eine Detailansicht des am Anschlussstück 19 vorgesehenen Rastkörpers 80; und

Fig. 8

ein zusammengesetztes erfindungsgemässes Verbindungselement, nämlich ein Stecker 22, in einer Teilschnittdarstellung, sowie eine Dateidarstellung einer im Stecker 22 integrierten Dichtung 28.

The invention will be explained in more detail with reference to drawings. Showing:

Fig. 1

an exploded view of an inventive connecting element, namely a bushing 24, a fitting 15 with a recessed therein Terminal contact 19, a seal 28, an intermediate member 50 with a recessed cable sealing ring 64 and a cap nut 30 includes;

Fig. 2

the composite and connected to an electrical line 12 socket 24 of FIG. 1 in a side view and a sectional view;

Fig. 3

a further inventive connecting element, namely a plug 22 in a side view and a sectional view;

Fig. 4

the plug 22 of FIG. 3 with, separated from the connector 14 intermediate element 50 in a spatial representation;

Fig. 5

the intermediate element 50 of the connecting element according to the invention and a detailed view of a notch 70 provided on the intermediate element 50;

Fig. 6

the connecting piece 18, of the inventive connecting element, namely a plug 22, as well as a detailed view of a provided on the plug 22 locking body 80;

Fig. 7

the connecting piece 19 of the inventive connecting element, namely a socket 24, and a detailed view of the provided on the connecting piece 19 detent body 80; and

Fig. 8

a composite inventive connecting element, namely a plug 22, in a partial sectional view, and a file representation of an integrated seal in the plug 22 28th

The FIGS. 1 and 2 show in various representations a first inventive connecting element 24, namely a connectable to an electrical line socket with a corresponding contact element 19th

The Figures 3 and 4 show in various views a second inventive connecting element 22, namely connectable to an electrical line connector with a corresponding contact element 18th

The two mutually complementary first and second connecting elements 22, 24 can be assembled to form a connector 10, which meets high safety requirements and can be advantageously used in photovoltaic systems. By such connector 10, individual parts of the electrical system can be easily separated, for example, during maintenance or installation work and later connected to each other again.

The first connecting element 24 consists of a connecting piece 15 with a front-side chamber 17, which serves to protect against contact. In the chamber 17, the connection contact 19 is arranged. Connection elements 22, 24 according to the invention can be provided with only one or more connection contacts 18, 19. At the side opposite the chamber 17, the connecting piece 15 has a connecting sleeve 20, which is provided on the outer surface with an external thread 26, optionally an external grid. The external thread 26 is placed around the connecting sleeve 20 in the form of a helix, wherein a counter-thread can be connected or released by a rotational movement with the external thread. A screening would, for example, be placed in a ring around the outer sleeve 20. Two parts with a complementary grid can be brought together and separated by an axial force. Preferably, the Device parts designed such that when connecting the device parts a smaller force must be spent, as when disconnecting the device parts.

In the connecting piece 15 of the terminal 19 is inserted. The terminal 19 is made of an electrically conductive material, preferably of metal, such as copper, zinc or a metal alloy. In preferred embodiments, the terminal 19 is coated with a conductive material to protect the contact and to achieve a low electrical resistance. Furthermore, the terminal contact 19 can be provided with fins in a region in order to improve the electrical contact with the corresponding terminal contact 18 of the plug 22. In the rear region, the connection contact 19 has a connection point against which the electrical conductor rests. The connection to the electrical conductor can be made with known connection techniques. Often crimp or solder joints are used. In the middle part, the connection contact 19 has an enlargement of the outside diameter. This enlargement forms, for example, a reinforcing ring which surrounds the connection contact 19 and has a radial height of 0.5 mm - 4 mm and an axial width of 0.5 mm - 10 mm. The reinforcing ring does not have to rotate around the entire connection contact 19. The reinforcing ring can also be divided into individual separate ring segments.

The connecting sleeve 20 can be connected to a corresponding first connecting part 52 of an intermediate element 50, which has an internal thread 54, optionally a grid. The intermediate element 50 has an at least partially within the first connection part 52

lying insulation cylinder 60. The insulating cylinder 60 has a length which is selected according to the length of the creepage distances or clearances defined in safety regulations. The insulating cylinder 60 has, on the side facing the connection piece 15, a reduced inside diameter or elevations or a claw facing the through-channel 66, by means of which the connection contact 19 is held in the predetermined position in the connection piece 15. The claw lying on the front side of the insulating cylinder 60 may extend along this also over a few millimeters. By using the insulating cylinder 60, it is possible to dispense with spring elements which hold the contact in position in known connecting elements 24.

On the intermediate element 50, a seal 28 is inserted between the first connecting part 52 and the insulating cylinder 60, which rests against the end face of the connecting sleeve 20. The preferably annular seal 28 is made of a rubber or a soft plastic. The seal is the limit for the dimensioning of the creepage and air gap with respect to the terminal contact 19 and should fit tightly between the connector 15 and the intermediate element 50, without being severely pinched.

On the opposite side of the insulating cylinder 60, the intermediate element 50 has a second connecting part 58 with an external thread, which corresponds to an internal thread 34 of a cap nut 30. At the exposed end of the second connecting part 58, a slat basket 62 is preferably arranged, in which a cable sealing ring 64 is inserted. The cable sealing ring 64 is made of a rubber or a soft plastic.

On the second connecting part 58, a union nut 30 is screwed, which has a corresponding internal thread 34. In the middle of the union nut 30 is an opening 32 for performing a line to be connected.

In order to prevent the parts, in particular the connecting piece 14, the intermediate element 50 and the union nut 30 from being assembled together in an incorrect sequence when assembling the connecting element 24, or the intermediate element 50 not being mounted, the first 52 and the second connecting part 58 preferably have diverging threads or rasters on.

FIG. 2 shows the assembled and connected to a line 12 connecting element 24 of FIG. 1 in a side view and in a side sectional view. The sectional view shows the lying in the front chamber 17 of the connector 15 terminal contact 19. To position the terminal 19 within the front chamber 17, this knows in the middle part of the terminal contact 19 to a reinforcing ring, which radially surrounds the terminal 19. To save material on the connection contact 19 and thus reduce the cost of the reinforcing ring have only small dimensions. However, the reinforcing ring should be sufficiently strong to counteract the axially acting tensile and compressive forces on the terminal contact 19. The reinforcing ring of the terminal contact 19 is held between the connecting piece 15 on the one hand and the insulating cylinder 60 on the other. By connecting the first connecting part 52 of the intermediate element 50 with the connecting piece 15, the insulating cylinder 60 is inserted so far into the connecting sleeve 20 of the connecting piece 15, that he abuts the reinforcing ring of the terminal 19 and presses it against the connector 15 and holds the terminal 19 in the chamber 17.

In the opposite end region of the insulating cylinder 60 is in the transition between the insulating cylinder 60 and the first connecting part 52, the seal 28. This sets the limit for the design of the creepage distance against the electric current leading terminal contact 19. The seal 28 should be tight between the connector 15 and the intermediate element 50 abut without being severely pinched.

Within the intermediate element 50, a through-passage 66 serving to receive the line 12 runs from the first to the second connecting part 52, 58. Subsequently to the second connecting part 58, a lamella basket 62 is arranged. In the slat basket 62 of the cable sealing ring 64 is recessed. About the slats basket 62 a union nut 30 is screwed, which has an opening 32 through which the line to be connected 12 is inserted to the terminal 19 in the connecting element 24. By tightening the nut 30 on the second connecting part 58 of the intermediate element 50 results in a gas-tight and liquid-tight enclosure of the line 12. at the same time the line 12 is held, so that a Zugsentlastung results. On the line 12 acting tensile forces are therefore transmitted to the connecting element 24 and not on the terminal contact 19. The cable sealing ring 64 also forms the boundary of the creepage distance and the creepage distance which extends to the connection contact 19. The clearance and creepage distance should be at least 10 mm for a connection element 24 which is approved for 1 kV.

FIG. 3 shows a further inventive connecting element, namely a plug 22 in a side view and in a sectional view. Subject to the connection contacts 18 and 19, and the connecting piece 14 and 15, the plug 22 is constructed as the sleeve 24. The front-side chamber 16 of the plug 22 has a larger inner diameter, so that the front part of the connecting piece 15 of the sleeve 24 is at least partially inserted therein ,

The terminal contact 18 has in the front region to a terminal contact 19 of the socket complementary shape. In order to achieve a better contact and thus a lower electrical contact resistance, the terminal contact 18 of the plug 22 is preferably equipped with fins.

In the middle part, the terminal contact 18 of the plug 22 also has a reinforcing ring, as has already been described previously in the terminal contact 19 of the socket 24.

FIG. 4 shows a spatial representation of the plug 22. In this case, the union nut 30 is connected to the intermediate element 50, while the connection piece 14 is separated from the intermediate element 50.

FIG. 5 shows an intermediate element 50 of a connecting element 22, 24 according to the invention, which is provided with a recess or indentation 70, which is shown in a detailed view. The indentation 70 is located on the internal thread 54 of the intermediate element 50, in the vicinity of the outer end of the internal thread 54, preferably less than a quarter turn from the outer end.

The notch 70 is configured according to the function and forms a partial recess in the internal thread 54. Die Notch 70 may be more or less deeply embedded in the internal thread 54 and also lower than the threaded base. Laterally, the notch 70 is bounded by an opening flank 72 and a Zewrehflanke 74, which can be easily generated in a plastic injection process.

The opening flank 72 is arranged perpendicular to the direction of rotation in the example shown. The notch 70 has a depth in the range of 0.3mm - 2mm, a width in the range 0.5mm - 3mm and a length in the range 1mm - 10mm.

The Zudrehflanke 74 is also in the lower region perpendicular to the direction of rotation. In the upper region, the Zudrehflanke 74 has a wedge surface 76, which is preferably inclined at an angle between 30 ° - 60 °, more preferably at an angle of 45 ° relative to the direction of rotation.

FIG. 6 shows the connector 14, a plug 22 with a locking body 80, which is shown enlarged in a detailed view. The latching body 80 is located between two thread elevations in a thread groove on the external thread 26 of the connection sleeve 20. The latching body 80 preferably has an at least approximately complementary shape to the above-described notch 70 and is preferably in the end region of the external thread 26 of the connection piece 14, 15th

FIG. 7 shows the connector 15 a socket 24 and a detailed view of the locking body 80. In this case, the locking body 80 has the properties described in the previous section.

FIG. 8 shows the inventive connecting element 22 in a three-dimensional sectional view and a detailed view of the seal 28. The notch 70 and the locking body 80 engage in the illustration shown in one another and thus form a locking device. By appropriate positioning of the two locking elements 70, 80 is ensures that when connecting the intermediate member 50 and the connecting piece 14, 15, the connecting part is not tightened too strong and thus the sensitive seal 28 too strong squeezes and is damaged. In addition, due to the cooperating locking elements 70, 80, the connection can only be opened with a tool. Due to the position of the locking elements 70, 80, the position of the intermediate element 50 with respect to the connecting piece 14, 15 is further determined. Thus, it is possible to position the two parts against each other so that, for example, a company logo on the intermediate element 50 in a line to the connector 14, 15 extends.

The latching body 80 and the notch 70 can also be arranged on the cap nut 30 and the second connecting part 58 of the intermediate element 50 and form a connecting element 70, 80 with previously described properties.

LIST OF REFERENCE NUMBERS

10

Connectors

12

management

14

Connector plug

15

Connector socket

16

front chamber connector

17

front-side chamber socket

18

Connection contact plug

19

Connection contact socket

20

connecting sleeve

22

plug

24

Rifle

26

External thread of the connection piece

28

poetry

30

Nut

32

Opening the union nut

34

Internal thread of the union nut

50

intermediate element

52

first connecting part of the intermediate element

54

Internal thread in the first connecting part 52nd

58

second connecting part of the intermediate element

60

insulating cylinder

62

lamella cage

64

Cable sealing ring

66

Through channel

70

notch

72

opening flank

74

Zudrehflanke

76

wedge surface

80

latching body

Claims (15)

Connecting element (22, 24) for a connector (10), namely plug (22) or socket (24), in particular for solar systems, with a connecting piece (14, 15), which at the front a chamber (16, 17) with at least one therein provided connection contact (18, 19) for an electrical line (12) and the rear a connection sleeve (20) with an external thread or an external grid (26) and with a union nut (30) having an internal thread (34) and one of the implementation of having an electrical line (12) serving opening (32), characterized in that an at least approximately hollow cylindrical intermediate element (50) is provided, which front of a connection sleeve (20) corresponding first connecting part (52) having an internal thread or an inner grid (54) and at the back a to the union nut (30) corresponding second connecting part (58) having an external thread and a passageway (66) through which the electrical line (12) to the terminal contact (18, 19) is feasible. Connecting element (22, 24) according to claim 1, characterized in that the intermediate element (50) frontally within the first connecting part (52) coaxially aligned therewith insulating cylinder (60) within the connecting sleeve (20) preferably to the at least one terminal contact (18, 19). Connecting element (22, 24) according to claim 1 or 2, characterized in that the first connecting part (52) of the intermediate element (50) forms a threaded sleeve which can be placed on the connecting sleeve (20) and / or in that the second connecting part (58) of the Intermediate element (50) forms a lamellar basket (62) provided with an external thread onto which the union nut (30) can be placed. Connecting element (22, 24) according to claim 2 or 3, characterized in that the wall thickness of the insulating cylinder (60) is uniform or on the front side in the region of the at least one connection contact (18, 19) is raised against this or against the terminal contact (18 , 19) directed foot element. Connecting element (22, 24) according to any one of claims 1-4, characterized in that at the front on the connecting sleeve (20) of the connecting element (22, 24), which between the first connecting part (52) and the insulating cylinder (60) of the intermediate element ( 50), a preferably annular seal (28) is arranged, which is preferably made of rubber or a soft plastic, and / or that within the second connecting part (58), a cable sealing ring (64) is provided. Connecting element (22, 24) according to claim 5, characterized in that the intermediate element (50) is dimensioned such that the distance between the terminal contact (18, 19) and the seal (28) and / or the distance between the terminal contact (18 , 19) and the cable sealing ring (64) is at least 5 mm, preferably at least 10 mm. Connecting element (22, 24) according to claim 5, characterized in that the internal thread or the inner grid of the first connecting part (52) and the external thread of the second connecting part (58) of the Intermediate element (50) have mutually divergent thread diameter, so that for the connection of the union nut (30) with the connection sleeve (20), the installation of the intermediate element (50) is required;
or that the internal thread or the inner grid of the first connecting part (52) and the external thread of the second connecting part (58) of the intermediate element (50) have mutually corresponding thread diameter, so that the union nut (30) optionally also directly with the connection sleeve (20) is connectable , Connecting element (22, 24) according to one of claims 1-7, characterized in that the connecting piece (14, 15) and / or the intermediate element (50) consist at least partially of modified PPE. Connecting element (22, 24) according to any one of claims 1-8, characterized in that on the internal thread (54) of the first connecting part (52) of the intermediate element (50) has a recess or indentation (70) and on the external thread of the connecting sleeve (26) of Connection piece (14, 15) a latching body (80) is provided, which are complementary to each other and form a locking device (70, 80). Connecting element (22, 24) according to claim 9, characterized in that the notch (70) preferably less than a quarter turn (π / 2) from the outer end of the internal thread (54) of the first connecting part (52) is removed. Connecting element (22, 24) according to one of claims 9 or 10, characterized in that the notch (70) has an opening flank (72) on which the latching body (80) abuts in the opening direction during rotation of the intermediate element (50) and that extends at least approximately perpendicular to the direction of rotation, and that the notch (70) has a Zudrehflanke (74) on which the latching body (80) during rotation of the intermediate element ( 50) in the closing direction and at least partially forms a wedge surface (76) which is inclined at an angle in the range of 30 ° - 60 °, preferably 45 ° to the direction of rotation. Connecting element (22, 24) according to any one of claims 9 - 11, characterized in that the notch (70) has a length in the range 1mm - 10mm, preferably 3mm - 5mm and a width in the range 0.5mm - 3mm and a height in the range 0.3mm - 2mm. Connecting element (22, 24) according to any one of claims 9 - 12, characterized in that the by the notch (70) and the locking body (80) formed locking device (70, 80) is dimensioned such that it can not be opened without tools and preferably a torque of at least 10Nm, preferably 40-60Nm, able to accommodate. Connecting element (22, 24) according to one of claims 1 - 13, characterized in that a reinforcing ring is formed on the terminal contact (18, 19), which preferably has a radial height of 0.5 mm - 4 mm and an axial width of 0, 5mm - has 10mm and at which preferably provided with a foot element end of the insulating cylinder (60). Plug connector (10) having a plug-shaped first connecting element (22) according to one of the claims 1-13 and a sleeve formed as a second connecting element (24) according to any one of claims 1-13.

Images