Assembly comprising an insulated down conductor and a connection head

Abstract

Assembly comprising an insulated down conductor (1) for external lightning protection and a connection head piece (2) for contacting the insulated down conductor (1) for external lightning protection, with a sleeve (3) having a first, axially extending inner diameter portion (4) adapted to the outer diameter or cross-section of the insulated down conductor (1) for receiving one end of the insulated down conductor (1), and an axially adjoining, second inner diameter portion (5) adapted to the outer diameter or cross-section of a stripped, exposed conductor end (6) of the insulated down conductor (1), such that an inner diameter of the first inner diameter portion (4) is larger than an inner diameter of the second inner diameter portion (5), characterized in that a flexible shaped piece is present in the first inner diameter section (4) of the sleeve (3), wherein a region of the flexible shaped piece projects flexible into the interior of the sleeve, and wherein the flexible shaped piece is designed such that the insulated downstream line (1) displaces the region of the flexible shaped piece when the insulated downstream line is inserted into the sleeve (3).

Description

The invention relates to an assembly comprising an insulated lead in the outer lightning protection and a connector head piece for contacting one of the insulated leads in the outer lightning protection.DE 37 83 549 T2 shows a watertight electrical splice closure housing for an electrical connection element which connects the ends of a plurality of insulated electrical conductors.EP 3 062 397 A1 discloses a cable connector in sleeve form, in which the wires / strands of two cables, which are to be electrically connected to one another, are introduced into opposite ends of the sleeve, wherein the mechanical connection is then effected via grub screws which are screwed into blind holes of the sleeve.DE 10 2013 000 194 B4 discloses a device for contacting a field control layer of an insulated conductor in the outer lightning protection. The insulated discharge line is guided at least over a length section in the interior of a supporting body or a supporting tube, spaced apart therefrom. Furthermore, a conductive connection element is present, which is connected on the one hand to the field control layer and on the other hand to a potential compensation, and wherein the connection element is located in the spacing space between the insulated lead and the interior of the supporting body or of the supporting tube or can be introduced into this spacing space.The connection element itself is formed in one piece and has a plurality of arms or fingers which are under mechanical prestress or spring force and come to conduct away on the surface of the field control layer of the insulated installation. In this type of configuration for contacting the field control layer, it is ensured that no damage to the field control layer occurs during assembly. The assembly process can be implemented quickly and intuitively by recourse to the described device and can be carried out largely without tools.In DE 10 2013 000 194 B4, how the insulated discharge line is accommodated in the upper region on a contact head piece, contacted there and mechanically fixed.From the assembly instructions on the HVI ® line, returning to the DETENS + SOHNE GmbH + Co. KG (see http: / / www.detens.de / detensacademy), it can be seen that for the assembly of the head piece or connecting element, the insulation of the insulated line, i.e. of the HVI ® line, must first be deposited.After the insulation has been set down, the head piece or the connection element is mounted or prefabricated at the line ends of the HVI ® line. The head piece or the connecting element is to be brought up to the HVI ® line and turned with right-hand rotation onto the respective line end up to the stop. In this case, a fork key can be attached to an existing key surface of the head piece or the connection element in a supporting manner.After the insulation has been set down, the head piece or the connection element is mounted or prefabricated at the line ends of the HVI ® line. The head piece or the connecting element is to be brought up to the HVI ® line and turned with right-hand rotation onto the respective line end up to the stop. In this case, a fork key can be attached to an existing key surface of the head piece or the connection element in a supporting manner.Subsequently, two threaded pins are screwed in with a tightening torque, so that a secure contact with the copper conductor of the HVI ® line can be realized. After the mounting of the head piece or of the connection element, the corresponding mounting regions must be shrink-fitted. The shrink-fitting is absolutely necessary for protection against mechanical, environmental or chemical influences. A predetermined shrinkage temperature must necessarily be maintained. In the shrink-around region of the HVI ® line, too high shrinkage temperatures must not be used. In the case of an excessive shrinkage temperature, there is the risk that the semiconducting jacket of the HVI ® line is impaired or destroyed.In the lightning current dissipation device according to DE 20 2018 101 038 U1, a catch device is assumed which is to be connected to an electrical conductor of an insulated dissipation device and ultimately to the grounding system. The electrical conductor is surrounded by an insulation.At the end region of the insulation facing the catching device and the further layer surrounding the latter, a connection cap made of electrically conductive material is present. With the aid of this connection cap, the catching device and / or the electrical conductor can be connected to the additional layer.In addition, the connection cap serves for contacting with the electrical conductor of the insulated lead.The connection cap is sleeve-like and can be applied with the sleeve jacket to the insulation together with the further layer present there. The sleeve bottom serves as a plug-in limitation for the insulation.The sleeve base is adjoined by a blind hole into which the stripped end of the conductor is inserted. The terminal cap is traversed by screws in thread form in the region of the blind hole, which screws contact the stripped end of the corresponding conductor with their end projecting into the blind hole.In order to avoid the use of adhesive or similar means for fixing the conductor in the sleeve, it is now proposed according to DE 20 2018 101 038 U1 to form a positive-locking part on the inside of the sleeve jacket of the connection cap, which in the assembly target position can be connected positively to this insulation while deforming the insulation of the lead. In this case, the form-fit part is also intended to press and hold the further layer together with the deformation of the insulation.In a preferred embodiment, the form-fit part is realized by at least one rib forming a thread turn, which protrudes from the inner side of the sleeve jacket of the connection cap.The principle of DE 20 20 2018 101 038 U1 is thus based on the idea of deforming the insulation in order to realize the desired positive connection. This is intended to ensure a tension-proof connection of the corresponding elements and to ensure an electrical contact. The positive-locking part is intended to penetrate radially into the material of the insulation in the desired mounting position.Accordingly, the device in that document is configured such that, as a result of the positive-locking part, when it brings about a deformation of the insulation in the intended assembly position and engages in the latter in a positive-locking manner, the additional layer which forms a semiconducting layer is also carried along and is subject to a pressing-in action in the deformation of the insulation.However, it has been found in practical application that, when the solution according to DE 20 2018 101 038 U1 is implemented, considerable forces have to be applied during the screw-on connection between the insulated discharge line and the connection cap there. Furthermore, it cannot be ruled out that, during the connection by rotary movement, the form-fit part cuts into the semiconducting sheath or the insulation and this damage these parts.From the foregoing it is therefore the object of the invention to specify an improved connection header for contacting an insulated lead in the outer lightning protection, which on the one hand allows a secure contacting of the semiconducting layer of the insulated lead with the connection header and in which a compensation of tolerances with respect to the diameter-side dimensions of the insulated lead likewise takes place, as well as the electrical contact between connection header and semiconducting layer is maintained under all environmental conditions and influences such as climate, moisture temperature change and the like. The solution to be specified is ultimately intended to prevent the necessary electrical connection from being subject to a functional impairment by a flow away of the plastic material of the insulated conductor.The object of the invention is achieved by the design of an assembly according to the combination of features according to claim 1, wherein the dependent claims represent at least practical embodiments and developments.Accordingly, an electrically conductive, in particular metallic, connection header for contacting an insulated conductor in the outer lightning protection is assumed.In this case, the connection header firstly ensures the necessary electrical and lightning current-bearing connection between the actual conductor of the insulated conductor, but also the necessary contacting of the field control layer of the insulated conductor, that is to say of the corresponding semiconducting cladding layer.The terminal header consists of a sleeve-shaped structure with an axially extending first inner diameter section, adapted to the outer diameter or the cross section of the inserted insulated lead for receiving a corresponding end of the insulated lead, and with an axially adjoining second inner diameter section, adapted to the outer diameter or the cross section of a stripped exposed conductor end of the insulated lead. In the first inner diameter portion of the sleeve, a resilient fitting is provided. A portion of the resilient molding piece resiliently projects into the sleeve interior. The resilient fitting is configured such that the insulated drain displaces the region of the resilient fitting upon insertion of the insulated drain into the sleeve.Means are also provided for fixing the stripped exposed conductor end in the second inner diameter section. The second inner diameter section can be realized as a through bore, but also as a blind hole or the like. On the second inner diameter section, there can be a known head piece, a connection for a catch rod or a connection for clamping to metallic components of an external lightning protection system.A stiction generating means is formed in the first inner diameter section of the sleeve, which extends into the interior of the sleeve in a resilient manner such that upon insertion of the lead against the resistance of the stiction generating means, a frictional connection is established between an outer sleeve of the insulated lead and the sleeve. Because the stiction generating means extends resiliently into the interior of the sleeve, tolerance compensation is possible with respect to the insulated discharge supplied in each case. Furthermore, the flexibility ensures that a necessary electrical contact to the inner jacket of the sleeve is maintained even in the event of a possible flow away of plastic components of the insulated discharge line.A conductive or semiconducting sheath of the arrangement of insulated lead and connection header, which would otherwise become necessary, in the corresponding transition region can be dispensed with in a surprising manner, so that the mounting process on site is simplified and the relevant standards are complied with.In a further development of the invention, the sleeve has a sleeve wall in the first inner diameter section, which has a recess for receiving a spring element as a means generating static friction.The sleeve wall can also have a plurality of recesses for receiving a corresponding plurality of spring elements as static friction-generating means. For the arrangement and formation of a plurality of spring elements, it is decisive that a surface section of the semiconducting layer of the insulated conductor that is as large as possible comes into contact with the metallic inner wall of the sleeve. When considering the cross section of the sleeve, an arrangement of spring elements in a position between substantially 10.00 o'clock and 14.00 o'clock is conceivable.The spring element or elements can be fixed in a clamping manner on the cutout or cutouts. When the insulated discharge line is inserted into the sleeve, the spring element or elements are at least partially displaced, i.e. pushed back, into the recess, so that the force exertion during the insertion of the insulated discharge line into the sleeve is kept within limits and nevertheless a secure contacting and adhesion is ensured.The spring element or elements can be designed as a leaf spring, wherein the longitudinal extension of the respective leaf spring runs in the axial direction of the sleeve in order to avoid destructive cutting-in, i.e. damage, in particular of the semiconducting layer of the insulated conductor.The spring element or elements can be configured to be clipable or latchable into the recess.For this purpose, the corresponding spring elements have clamp-like extensions on their longitudinal side ends for encompassing corresponding sections of the sleeve wall in the region of the cutout.The stiction generating means or means can also be designed as a tongue section of a punching of the sleeve material, wherein a tongue end protrudes radially into the interior of the sleeve.The correspondingly free tongue end or ends extend in the longitudinal direction, that is to say axially in the first inner diameter section. Alternatively, the free tongue ends may extend over an inner circumferential portion of the sleeve following the sleeve radius.In principle, the inside diameter of the first inside diameter section is selected to be slightly larger than the outside diameter of the insulated lead to be received.The static friction-generating means can be formed in one piece, but also in multiple pieces. This means that, according to one example, a spring element as a stiction-generating means can be formed from a wave spring, a slotted leaf spring or the like configuration.The spring element can consist of an electrically conductive, in particular metallic, spring material. However, it is also possible to produce the spring element from a plastic material. The pressing effect is decisive for the contacting in this case, i.e. the development of a static friction between the corresponding outer jacket of the insulated discharge line and the inner jacket or the inner side of the corresponding sleeve section.The invention will be explained in more detail below with reference to exemplary embodiments and with the aid of figures.The following are shown here:FIG. 1 shows a longitudinal and cross-sectional representation of an example of an assembly with a connection header and an insulated lead accommodated therein, which has an exposed conductor section fixed in a second inner diameter section of the sleeve of the connection header, and a stiction generating means, designed as a spring element;FIG. 2 shows a side view, a top view and a perspective illustration of a spring element as a means for generating static friction;FIG. 3 shows several exemplary front views, longitudinal sectional representations and perspective representations of a connection head piece with a first, axially extending inner diameter section together with a recess for receiving a spring element as shown in FIG. 2, wherein the diameter specifications represent embodiments of connection head pieces for insulated pipes with different diameters. Moreover, it is made clear with the exemplary provisos to what extent the inside diameter of the first inside diameter section of the sleeve is selected to be slightly larger than the outside diameter of the respective insulated lead to be accommodated;FIGS. 4 and 5 are perspective and detailed views of a further embodiment for forming a means generating static friction in the form of a punching of the sleeve material to form a tongue section, wherein a free tongue end extends radially in the direction of the sleeve interior and according to FIG. 4 the free tongue end extends in the longitudinal direction, i.e. axially, in the first inner diameter section or according to FIG. 5, wherein the free tongue end extends over an inner circumferential section of the sleeve following the sleeve radius.The basic structure of an exemplary connection head piece can be seen from the representations according to FIG. 1 or FIGS. 4 and 5.The connection header 2 serving for contacting an insulated discharge line 1 consists of a sleeve 3.The sleeve 3 has a first, axially extending inner diameter section 4 which is matched to the outer diameter or the cross section of the insulated discharge line 1. This first axially extending inner diameter portion 4 receives a corresponding end of the insulated duct 1 in its interior.Furthermore, the sleeve has a second inner diameter section 5 which extends axially adjacent thereto.This is matched to the outer diameter or the cross section of a stripped exposed conductor end 6 of the insulated conductor 1.Furthermore, for example, grub screws 7 are provided as means for fixing the stripped, exposed conductor end 6 in the second inner diameter section 5.In the first inner diameter section 4 of the sleeve 3 there is a stiction generating means, designed as a spring element 8.According to the longitudinal sectional illustration according to FIG. 1, this spring element 8 protrudes resiliently into the interior of the sleeve in such a way that, when the discharge line 1 is inserted, a frictional connection is established between an outer sleeve (not shown in detail) of the insulated discharge line 1 there and the sleeve 3.In this regard, the sleeve wall has a recess 10 in the region of the first inner diameter section 4 for receiving the spring element 8 as the force-generating means.The cross-sectional illustration according to FIG. 1, lower image, makes it clear that different positions between substantially 10.00 o'clock and 14.00 o'clock can be selected for the cutout, including the spring element 8 inserted therein. What is important in any case is that the corresponding end of the insulated lead, with its outer jacket, comes intimately into electrical contact with the inner jacket of the sleeve or of the connection head piece.The views according to FIG. 2 show an exemplary spring element 9, which is preferably metallic here.This spring element 9 is realized as a leaf spring, wherein the longitudinal extension of the leaf spring runs in the axial direction to the sleeve 3 (see FIG. 3 ).From the figures according to FIG. 3, it can also be understood by the person skilled in the art how the relevant spring element 9 is fixed in a clamp in the sleeve recess 10 and how, with the insertion or insertion of the insulated discharge line into the sleeve, the spring element 9 is partially pushed back into the recess 10, i.e. displaced.The spring element 9 can be clipped or latched into the recess 10.In this regard, the spring element 9 has clamp-like extensions 11 at its longitudinal side ends, which serve to engage around corresponding sections of the sleeve wall in the region of the recess 10.Following the representations according to FIGS. 4 and 5, the force-generating means can also be designed as a tongue section 12 of a punching of the sleeve material, wherein a free tongue end 13 extends radially in the direction of the sleeve interior.The free tongue end 13 can be located longitudinally, i.e. axially, in the first inner diameter section 4 of the sleeve, as FIG. 4 makes clear.Alternatively, it is possible to realize the punching in such a way as is illustrated in FIG. 5. In this case, the free tongue end 14 extends radially, following the sleeve radius, into the interior of the first inner diameter section 4 of the sleeve.It can be seen from the cross-sectional, longitudinal-section and perspective representations according to FIG. 3 how the inside diameter of the first inside diameter section 4 of the sleeve must be selected to be slightly larger than the outside diameter of an insulated discharge line that is different in diameter (not shown there) and by what extent the spring element shown there may project into the first inside diameter section of the sleeve, so that, on the one hand, a tool-free, easy insertion of the insulated discharge line into the connection header can take place and, on the other hand, the necessary frictional connection is maintained under all environmental and use conditions.As already explained, the spring element 8 can be designed in an example as a leaf spring, wherein the longitudinal extension of such a spring element runs in the axial direction of the sleeve 3. Alternatively, however, it is also possible to design a flexible shaped part, for example designed as a wire structure, radially or tangentially with respect to the sleeve 3, wherein it is finally decisive that a relevant region of the element protrudes resiliently into the sleeve interior, so that when the discharge line 1 is inserted, a corresponding frictional connection is established between an outer sleeve of the insulated discharge line 1 and the sleeve 3.

Claims

An assembly comprising an insulated outer lightning protection drain (1) and a terminal header (2) for contacting the insulated outer lightning protection drain (1), comprising a sleeve (3) having a first axially extending inner diameter portion (4) matched to the outer diameter or cross section of the insulated drain (1) for receiving an end of the insulated drain (1) and an axially subsequently extending second inner diameter portion (5) matched to the outer diameter or cross section of a stripped, exposed conductor end (6) of the insulated drain (1) such that an inner diameter of the first inner diameter portion (4) is greater than an inner diameter of the second inner diameter portion (5), characterized in that a resilient molding is present in the first inner diameter portion (4) of the sleeve (3), wherein a region of the flexible molded part protrudes resiliently into the sleeve interior, and wherein the flexible molded part is designed such that the insulated discharge line (1) displaces the region of the flexible molded part when the insulated discharge line is pushed into the sleeve (3).Assembly according to claim 1, characterised in that the region of the flexible shaped part projects in a flexible manner into the interior of the sleeve in such a way that when the discharge line (1) is inserted, a corresponding frictional connection is established between an outer sleeve of the insulated discharge line (1) and the sleeve (3).Assembly according to claim 1 or 2, characterised in that the flexible shaped piece is formed as a wire structure.Assembly according to any one of the preceding claims, characterized in that the flexible moulding is formed radially with respect to the sleeve (3).Assembly according to any one of claims 1 to 3, characterised in that the flexible moulding is formed tangentially with respect to the sleeve (3).Assembly according to one of the preceding claims, characterized in that the region of the flexible shaped part runs in the axial direction of the sleeve (3).Assembly according to one of the preceding claims, characterized in that the inside diameter of the first inside diameter section (4) is selected to be slightly larger than the outside diameter of the insulated discharge line (1) to be accommodated.

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