CN113013659A

CN113013659A - Anti-twist connector, cable connecting device and wind generating set

Info

Publication number: CN113013659A
Application number: CN201911319512.3A
Authority: CN
Inventors: 杨鹏飞; 邢德義
Original assignee: Xinjiang Goldwind Science and Technology Co Ltd
Current assignee: Xinjiang Goldwind Science and Technology Co Ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2021-06-22
Anticipated expiration: 2039-12-19
Also published as: CN113013659B

Abstract

The application provides a prevent turning round connector, cable junction device and wind generating set. Anti-twist connector for connecting two cables, comprising: the device comprises a shell, a conductor, a conductive shaft and an elastic piece; the shell is provided with an external connection end which is used for being connected with a cable; the electric conductor is positioned in the cavity of the shell and is connected with the shell; the conductive shaft is movably arranged in the shell in a penetrating way; the first end of the conductive shaft is exposed out of the shell and is used for being connected with another cable; the flange on the conductive shaft is positioned in the cavity of the shell and is contacted with the conductor along the axial direction of the conductive shaft; the elastic piece is positioned in the cavity of the shell, is in contact with the conductive shaft and is used for driving the flange of the conductive shaft to compress the conductive body. When the two cables are twisted relatively, the torsion generated by the two cables can drive the conductive shaft to rotate relative to the shell and the conductive body, so that the torsion is effectively eliminated, namely, the twisting deformation of the cables can be absorbed by the anti-twisting connector, and the cables are prevented from being damaged by twisting deformation.

Description

Anti-twist connector, cable connecting device and wind generating set

Technical Field

The application relates to the technical field of cable connectors, in particular to an anti-torsion connector, a cable connecting device and a wind generating set.

Background

In some mechanical devices, cables are required to be connected to rotating parts, for example, lightning protection cables are generally required to be connected to blades of wind generating sets. When the rotating component rotates, the cable is easy to be twisted and deformed, the cable is abraded, and even the cable is twisted off in severe cases. Therefore, the cable connected to the rotating member is easily twisted and deformed in the prior art.

Disclosure of Invention

This application provides a prevent turning round connector, cable junction device and wind generating set to prior art's shortcoming for the cable of connecting on the rotary part that exists among the solution prior art easily twists reverse the problem of deformation.

In a first aspect, an embodiment of the present application provides an anti-twist connector for connecting two cables, including: the device comprises a shell, a conductor, a conductive shaft and an elastic piece;

the shell is provided with an external connection end which is used for being connected with a cable;

the electric conductor is positioned in the cavity of the shell and is connected with the shell;

the conductive shaft is movably arranged in the shell in a penetrating way; the first end of the conductive shaft is exposed out of the shell and is used for being connected with another cable; the flange on the conductive shaft is positioned in the cavity of the shell and is contacted with the conductor along the axial direction of the conductive shaft;

the elastic piece is positioned in the cavity of the shell, is in contact with the conductive shaft and is used for driving the flange of the conductive shaft to compress the conductive body.

In a second aspect, an embodiment of the present application provides a cable connection device, including a first cable connector, and the torsion-proof connector provided in the embodiment of the present application;

one end of the first cable connector is connected with the external connection end of the shell in the anti-twist connector, and the other end of the first cable connector is used for being connected with a cable.

In one embodiment of the present application, the cable connection device includes a second cable connector;

one end of the second cable connector is connected with the first end of the conductive shaft in the torsion-proof connector, and the other end of the second cable connector is used for being connected with another cable.

In a third aspect, an embodiment of the present application provides a wind turbine generator system, including a hub, a blade, a pitch bearing, a first lightning protection cable, and the cable connection device provided in the embodiment of the present application;

the hub is connected with the blades through a variable pitch bearing; one end of the first lightning protection cable is connected with the blade, and the other end of the first lightning protection cable is connected with a first cable connector of the cable connecting device; the cable connection device is fixed close to the center line of the blade or the pitch bearing.

In a fourth aspect, an embodiment of the present application provides another wind turbine generator system, including a hub, a blade, a pitch bearing, a first lightning protection cable, a second lightning protection cable, and the cable connection device provided in the embodiment of the present application;

the hub is connected with the blades through a variable pitch bearing; one end of the first lightning protection cable is connected with the blade, and the other end of the first lightning protection cable is connected with a first cable connector of the cable connecting device; one end of the second lightning protection cable is connected with the designated position, and the other end of the second lightning protection cable is connected with a second cable connector of the cable connecting device; the cable connection means are located close to the centre line of the blade or pitch bearing.

Compared with the prior art, the method has the following beneficial technical effects:

in the connector of preventing turning round, cable junction device and wind generating set that this application embodiment provided, because the conducting shaft can slide for casing and electric conductor along the axial of self, consequently the elastic component can order about the flange of conducting shaft and compress tightly the electric conductor, prevents that casing, electric conductor and conducting shaft from taking off for casing, electric conductor and conducting shaft remain the contact all the time, form and be used for electrically conductive route. When the two cables are respectively connected with the external connection end and the first end, the current in one cable can be transmitted to the other cable through the path. When the two cables are twisted relatively, the torsion generated by the two cables can drive the conductive shaft to rotate relative to the shell and the conductive body, so that the torsion is effectively eliminated, namely, the twisting deformation of the cables can be absorbed by the anti-twisting connector, and the cables are prevented from being damaged by twisting deformation.

In addition, the electric conductor, the elastic piece and a part of the electric conduction shaft are all accommodated in the shell, so that the parts are effectively prevented from falling off. Moreover, the anti-twist connector is compact and simple in structure and convenient to carry about.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a torsion-proof connector according to an embodiment of the present disclosure;

FIG. 2 the present application provides a cross-sectional view taken along line A of FIG. 1;

FIG. 3 is a schematic diagram of the flow of current in the path of an anti-twist connector according to an embodiment of the present application;

FIG. 4 is a schematic view of an assembly of a housing and an electrical conductor according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of a cable connection device according to an embodiment of the present application;

FIG. 6 is a sectional view taken along line B of FIG. 5;

FIG. 7 is a schematic view of a cable connection device according to an embodiment of the present application;

fig. 8 is a cross-sectional view taken along line C of fig. 7.

The reference numerals are explained as follows:

100-anti-twist connector;

1-a shell; 101-a cavity;

11-a first bowl; 12-a second bowl; 13-riveting; 14-a shaft hole; 15-an outer connection end;

2-an electrical conductor;

3-a conductive shaft;

31-a first end; 32-a second end; 33-a flange;

4-an elastic member; 5-a screw; 6-a first support ring; 7-a first bearing; 8-a second support ring;

9-sealing ring;

200-a first cable connector;

201-a first connection terminal; 202-a first bolt;

203-a first nut; 204-a first protective sleeve;

300-a second cable connector;

301-a first connector; 302-a second connection terminal;

3011-connecting the plates; 3012-a connecting cylinder; 303-a second bolt;

304-a second nut; 305-a second protective sleeve; 306-a dowel;

400-a first lightning protection cable; 500-a second lightning protection cable.

Detailed Description

The invention is described in detail below, and examples of embodiments of the invention are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar parts throughout, or parts having the same or similar function. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present invention, it is omitted. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The embodiment of the application provides an anti-twist connector 100 for connecting two cables. As shown in fig. 1 and 2, the torsion-proof connector 100 includes: a shell 1, a conductor 2, a conductive shaft 3 and an elastic element 4.

The housing 1 is provided with an external connection end 15, the external connection end 15 being adapted for connection to a cable. The electric conductor 2 is positioned in the cavity of the shell 1 and is connected with the shell 1.

The conductive shaft 3 is movably arranged in the shell 1 in a penetrating way, and a first end 31 of the conductive shaft 3 is exposed out of the shell 1 and is used for being connected with another cable; and a flange 33 on the conductive shaft 3 is positioned in the cavity of the shell 1 and is in contact with the electric conductor 2 along the axial direction of the conductive shaft 3. The elastic element 4 is located in the cavity of the housing 1 and contacts the conductive shaft 3 for driving the flange 33 of the conductive shaft 3 to press the conductive body 2.

It should be noted that the housing 1, the conductor 2 and the conductor shaft 3 are all made of an electrically conductive material. The conductive shaft 3 movably penetrates through the shell 1: the conductive shaft 3 can slide in its own axial direction with respect to the housing 1 and the conductor 2, and can also rotate with its own axis as a rotation axis with respect to the housing 1 and the conductor 2.

Since the conductive shaft 3 can slide relative to the housing 1 and the conductive body 2 along its own axial direction, the elastic member 4 can drive the flange 33 of the conductive shaft 3 to press the conductive body 2, and prevent the housing 1, the conductive body 2 and the conductive shaft 3 from loosening, so that the housing 1, the conductive body 2 and the conductive shaft 3 are always kept in contact, and a path for conducting electricity is formed, wherein the flow direction of the current in the path is shown by an arrow in fig. 3. When the two cables are connected to the external connection terminal 15 and the first terminal 31, respectively, the current in one cable can be transmitted to the other cable through the above path. When the two cables are twisted relatively, the torsion generated by the two cables can drive the conductive shaft 3 to rotate relative to the housing 1 and the conductive body 2, so that the torsion is effectively eliminated, that is, the twisted cable deformation of the cables can be absorbed by the anti-twisting connector 100, and the cables are prevented from being damaged by the twisted deformation.

In addition, the conductor 2, the elastic member 4 and a part of the conductor shaft 3 are accommodated in the housing 1, and the parts are effectively prevented from falling off. Moreover, the anti-twist connector 100 is compact and simple in structure and is convenient to carry about.

In an embodiment of the present application, as shown in fig. 2, the conductive body 2 is annular, the conductive body 2 is sleeved on the conductive shaft 3, and a first preset distance is maintained between an inner wall of the conductive body 2 and an outer wall of the conductive shaft 3.

As will be understood by those skilled in the art, since the conductive body 2 is annular, the conductive body 2 has two cylindrical side surfaces, the cylindrical side surface located inside the conductive body 2 is the inner wall of the conductive body 2, and the cylindrical side surface located outside the conductive body 2 is the outer wall of the conductive body 2.

One end surface of the flange 33 is in contact with one end surface of the conductor 2 in the axial direction of the conductive shaft 3, and the other end surface of the conductor 2 is connected to the housing 1.

Optionally, the first preset distance may ensure that the inner wall of the conductor 2 does not contact with the outer wall of the conductive shaft 3, and the specific value of the first preset distance may be determined according to actual design requirements. Between the conductor 2 and the conductive shaft 3, only one end face of the conductor 2 is contacted with the flange 33 of the conductive shaft 3, thereby avoiding unnecessary abrasion of other positions of the conductor 2 and the conductive shaft 3 and reducing the friction force born by the conductive shaft 3 during rotation.

It will be understood by those skilled in the art that the outer wall of the conductive shaft 3 is the cylindrical side of the conductive shaft 3. In addition, the end face of the conductor 2 and the end face of the flange 33 are both circular ring surfaces, and the two end faces are in contact with each other, so that the axial stress of the conductor 2 and the conductive shaft 3 is more uniform, and the risk that the conductive shaft 3 is blocked in the rotating process is reduced.

Alternatively, as shown in fig. 2, the conductor 2 may be connected to the housing 1 by a screw 5. The tail part of the screw 5 passes through the side wall of the shell 1 and is screwed into the threaded hole on the end surface of the electric conductor 2, so that the electric conductor 2 and the shell 1 are connected together. Of course, the conductor 2 and the housing 1 may be connected by other methods, such as adhesion, and will not be described herein.

In one embodiment of the present application, as shown in fig. 2, the anti-twist connector 100 further comprises a first support ring 6. The first supporting ring 6 is sleeved on the conductive shaft 3, is located in a radial gap between the inner wall of the conductive body 2 and the outer wall of the conductive shaft 3, and is respectively contacted with the conductive body 2 and the conductive shaft 3.

As shown in fig. 2, the inner wall of the conductive body 2 is in contact with the outer wall of the first support ring 6, the outer wall of the conductive shaft 3 is in contact with the inner wall of the first support ring 6, and the conductive body 2 can provide radial support for the conductive shaft 3 through the first support ring 6. In addition, the first supporting ring 6 can be used as an axial positioning reference of the electric conductor 2 and the electric conduction shaft 3, so that the electric conductor 2 and the electric conduction shaft 3 can be kept coaxial, a first preset distance can be kept between the inner wall of the electric conductor 2 and the outer wall of the electric conduction shaft 3, and the phenomenon that the electric conductor and the electric conduction shaft are directly contacted to form a burning trace on the surface to cause the structure to be blocked is avoided.

In one embodiment of the present application, as shown in fig. 2, the first support ring 6 is made of a non-metallic material having a self-lubricating function.

The self-lubricating function of the first support ring 6 greatly reduces friction between the electric conduction shaft 3 and the first support ring 6, and the first support ring 6 can be regarded as a sliding bearing capable of providing radial support for the first support ring 6, so that a better feasible condition is provided for the electric conduction shaft 3 to slide relative to the housing 1 and the electric conductor 2 along the axial direction of the electric conduction shaft.

In one embodiment of the present application, as shown in fig. 2, the anti-twist connector 100 further comprises a first bearing 7. The inner ring of the first bearing 7 is sleeved on the conductive shaft 3, and the outer ring of the first bearing 7 is abutted against the surface of the cavity of the shell 1.

The housing 1 can provide radial support for the contact shaft 3 by means of the first bearing 7, and the first bearing 7 is a rolling bearing, providing a possibility for the contact shaft 3 to be able to rotate relative to the housing 1 and the electrical conductor 2.

In order to further avoid friction between the housing 1 and the first bearing 7, smoothness of the axial sliding of the conductive shaft 3 is ensured. In one embodiment of the present application, the anti-twist connector 100 further comprises a second support ring 8, the second support ring 8 being made of a non-metallic material having a self-lubricating function. The second support ring 8 is arranged on the outer ring of the first bearing 7, and the outer ring is abutted against the cavity surface of the shell 1 through the second support ring 8.

The self-lubricating function of the second support ring 8 reduces the friction between the first bearing 7 and the housing 1 to a greater extent, and the second support ring 8 can be regarded as a sliding bearing that can provide radial support for the electric conductive shaft 3 and the first bearing 7, providing better feasible conditions for the electric conductive shaft 3 to be able to slide in its own axial direction relative to the housing 1 and the electric conductor 2.

In order to reduce wear of the elastic member 4, in one embodiment of the present application, as shown in fig. 2, the electric conductor 2 and the first bearing 7 are located on both sides of the flange 33 in the axial direction of the electric conductor shaft 3. The elastic member 4 is in a compressed state, one end of the elastic member 4 abuts against the flange 33, and the other end of the elastic member 4 abuts against the inner race of the first bearing 7.

When the conductive shaft 3 can rotate relative to the shell 1 and the conductor 2, the elastic part 4 can synchronously rotate along with the conductive shaft 3 and the bearing inner ring, so that the dynamic friction between the elastic part 4 and the conductive shaft 3 is avoided, and the abrasion of the elastic part 4 is avoided.

Alternatively, the elastic member 4 may be provided at other positions. In one embodiment of the present application, as shown in fig. 2, the conductive body 2 and the elastic member 4 are respectively located on both sides of the flange 33 in the axial direction of the conductive shaft 3. When the elastic member 4 is in a compressed state, one end of the elastic member 4 abuts against the flange 33 and the other end of the elastic member 4 abuts against the housing 1, the elastic member 4 cannot rotate synchronously with the conductive shaft 3. Of course, the other end of the elastic element 4 may abut against the outer ring of the first bearing 7 or the end face of the second support ring 8.

Alternatively, the elastic member 4 may be a coil spring, and the coil spring is sleeved on the conductive shaft 3.

Of course, the elastic member 4 may have other forms, for example, the elastic member 4 may be a block or a cylinder made of elastic material such as rubber, and will not be described in detail herein.

In one embodiment of the present application, as shown in fig. 2, the flange 33 is a shoulder integrally formed on the conductive shaft 3, i.e. the flange 33 is part of the conductive shaft 3. The hardness of the conductive shaft 3 is greater than that of the conductive body 2, and a second preset distance is kept between the outer wall of the flange 33 and the cavity surface of the shell 1.

In one embodiment of the present application, as shown in fig. 2, the flange 33 is an annular member sleeved on the conductive shaft 3, i.e. the conductive shaft 3 and the flange 33 are of a split design. The hardness of the flange 33 is greater than that of the conductor 2, and a second preset distance is kept between the outer wall of the flange 33 and the cavity surface of the shell 1.

Alternatively, the material of the electric conductor 2 may be graphite, copper, or the like. If the conductive shaft 3 and the flange 33 are integrally formed, the material of the conductive shaft 3 needs to satisfy the desired conductivity and have a hardness greater than the material hardness of the conductor 2. If the conductive shaft 3 and the flange 33 are designed separately, the material of the flange 33 may satisfy the desired conductivity and the hardness thereof may be greater than the material hardness of the conductive body 2.

When the shaft 3 rotates relative to the conductor 2, the flange 33 rubs against the conductor 2, and at this time, the conductor 2 is preferentially worn. The electric conductor 2 and the shell 1 are detachably connected (for example, connected through a screw 5), and when the abrasion loss of the electric conductor 2 reaches a preset maximum allowable abrasion loss, the electric conductor 2 is detached from the shell 1 and replaced by a new electric conductor 2.

Optionally, the second preset distance may ensure that the flange 33 does not contact the cavity surface of the housing 1, that is, a gap is left between the flange 33 and the cavity surface of the housing 1, and a specific value of the second preset distance may be determined according to an actual design requirement.

As shown in fig. 2, one side of the flange 33 is the conductive body 2, and the other side of the flange 33 is the cavity 101 (i.e. the space where the elastic member 4 is located, which is a part of the cavity of the housing 1), and powder generated by abrasion of the conductive body 2 can enter through the gap between the flange 33 and the cavity surface of the housing 1 and be stored in the cavity 101. Along with the increase of the abrasion loss of the conductor 2, the axial length of the conductor 2 is shortened, and the elastic part 4 can drive the conductive shaft 3 to slide towards the conductor 2, so that on one hand, the flange 33 can be ensured to be kept in contact with the conductor 2, and on the other hand, the volume of the cavity 101 is further enlarged, and the cavity 101 can contain more powder.

In one embodiment of the present application, the flange 33 is an annular member sleeved on the conductive shaft 3, i.e. the conductive shaft 3 and the flange 33 are of a split design. The hardness of the flange 33 is less than that of the conductor 2, and a second preset distance is kept between the outer wall of the flange 33 and the cavity surface of the shell 1.

Alternatively, the material of the flange 33 may be graphite, copper, or the like, and the material of the conductor 2 may satisfy the desired conductivity and have a hardness greater than the material hardness of the flange 33. When the conductive shaft 3 rotates relative to the conductive body 2, the flange 33 and the conductive body 2 rub against each other, and at this time, the flange 33 is preferentially worn. The flange 33 is detachably connected with the conductive shaft 3, and when the abrasion amount of the flange 33 reaches a preset maximum allowable abrasion amount, the flange 33 is detached from the conductive shaft 3 and replaced by a new flange 33.

As shown in fig. 2, one side of the flange 33 is the conductive body 2, and the other side of the flange 33 is the cavity 101 (i.e. the space where the elastic member 4 is located), and powder generated by abrasion of the flange 33 can enter through the gap between the flange 33 and the cavity surface of the housing 1 and be stored in the cavity 101. As the wear amount of the flange 33 increases, the axial length of the flange 33 is shortened, and the elastic member 4 can drive the conductive shaft 3 to slide towards the conductive body 2, so that on one hand, the flange 33 can be ensured to be kept in contact with the conductive body 2, and on the other hand, the volume of the cavity 101 is further enlarged, so that the cavity 101 can contain more powder.

In one embodiment of the present application, the second end 32 of the conductive shaft 3 is exposed to the housing 1. The conductive shaft 3 is disposed near the second end 32 and exposed to the housing 1, and has a first predetermined length.

The length of the portion of the conductive shaft 3 exposed to the housing 1 may be used to indicate the amount of wear of the conductive body 2 or flange 33. Specifically, as the wear amount of the conductor 2 or the flange 33 increases, the elastic member 4 may drive the conductor shaft 3 to slide towards the conductor 2, so that the length of the part of the conductor shaft 3 exposed out of the housing 1 may be shortened, and a worker may determine the wear amount of the conductor 2 or the flange 33 according to the change of the length, so that the routine inspection of the anti-twisting connector 100 is very convenient.

The specific value of the first preset length may depend on the actual design requirement, for example, the first preset length may be 10 mm.

Alternatively, the first preset length may be determined according to the maximum allowable wear amount of the conductor 2 or the flange 33, and the first preset length satisfies the following requirements: when the conductor 2 or the flange 33 is worn to the maximum allowable amount, the second end 32 of the conductor shaft 3 is flush with the outer surface of the housing 1. When the operator sees that the second end 32 of the conductive shaft 3 is flush with the outer surface of the housing 1, the maximum allowable amount of wear of the conductive body 2 or the flange 33 can be determined, so that the conductive body 2 or the flange 33 can be replaced in time.

In one embodiment of the present application, as shown in fig. 2 and 4, the anti-twisting connector 100 further includes a sealing ring 9, and the sealing ring 9 is sleeved on the conductive shaft 3. The side wall of the shell 1 is provided with a shaft hole 14; the part of the conductive shaft 3 sleeved with the sealing ring 9 is arranged in the shaft hole 14.

The number of sealing rings 9 in each axial bore 14 may be determined according to the actual design requirements, and in the embodiment of the present application, two sealing rings 9 are provided in each axial bore 14. The sealing ring 9 improves the sealing performance of the cavity of the shell 1 and prevents powder generated by abrasion of the conductor 2 or the flange 33 from leaking out of the shell 1.

In the embodiment of the present application, the specific structural form of the housing 1 is not specifically limited as long as the installation requirements of the above components can be met.

One possible form of the housing 1 is shown in fig. 4, the housing 1 comprising a first bowl 11 and a second bowl 12. The edge of the bowl mouth of the first bowl-shaped piece 11 is matched with the edge of the bowl mouth of the second bowl-shaped piece 12 and connected through a rivet 13, and the bottom of the first bowl-shaped piece 11 and the bottom of the second bowl-shaped piece 12 are respectively provided with a shaft hole 14. As shown in fig. 2 and 4, the first end 31 of the conductive shaft 3 is exposed out of the housing 1 through the shaft hole 14 on the bottom of the first bowl-shaped member 11; the second end 32 of the conductive shaft 3 is exposed to the housing 1 through the shaft hole 14 on the bottom of the second bowl-shaped member 12. The bowl bottom of the second bowl-shaped part 12 is connected with an external connection end 15, and the external connection end 15 is in a plate shape.

In one embodiment of the present application, the elastic member 4 may also be disposed outside the housing 1. It will be understood by those skilled in the art that the elastic member 4 may be connected to the housing 1 and the portion of the conductive shaft 3 exposed from the housing 1, respectively, for driving the flange 33 of the conductive shaft 3 to press the conductive body 2. The elastic member 4 disposed outside the housing 1 may function as a light radiation.

Based on the same inventive concept, the present application also provides a cable connection device, as shown in fig. 5 and 6, the cable connection device includes a first cable connector 200, and the anti-twisting connector 100 provided in the above embodiments of the present application.

One end of the first cable connector 200 is connected to the external terminal 15 of the housing 1 in the anti-twist connector 100, and the other end of the first cable connector 200 is used to connect to a cable (e.g., the first lightning protection cable 400 in fig. 5 and 6).

The first cable connector 200 is fixed relative to the housing 1, and the first cable connector 200 and the housing 1 are rotatable relative to the conductive shaft 3. In use, one end of the first cable connector 200 is connected to one cable, and the first end 31 of the conductive shaft 3 may be connected to another cable or fixed to a designated member.

In one embodiment of the present application, as shown in fig. 6, the first cable connector 200 includes a first connection terminal 201, one end of the first connection terminal 201 is connected to the external terminal 15, and the other end of the first connection terminal 201 is used for connecting to a cable.

Alternatively, the first connection terminal 201 may be a peep port terminal, and those skilled in the art will understand that one end of the peep port terminal is provided with a connection hole, and one end of the peep port terminal is used for connecting with a cable. The external connection end 15 of the housing 1 and the end of the peep hole terminal provided with the connection hole are connected by the first bolt 202 and the first nut 203.

Of course, the first connection terminal 201 and the external terminal 1 of the housing 1 may be connected in other manners, for example, they may be connected in a manner of being clamped in a piece.

In one embodiment of the present application, as shown in fig. 6, the cable connection device further includes a first protection sleeve 204, one end of the first connection terminal 201 and a joint of the cable, which are inserted into the first protection sleeve 204 through two nozzles of the first protection sleeve 204 respectively to be connected.

Optionally, the material of the first protective sleeve 204 is non-metal, and the position where the first connection terminal 201 and the cable are combined with each other is fixed by the fast injection-molding sleeving manner of the first protective sleeve 204, so that the joint of the cable is prevented from reciprocating deformation due to long-term pressure of the first protective sleeve 204, and further the joint abrasion of the cable is avoided.

In the first protective sheath 204, the nozzle for inserting the joint of the cable may be designed as a bell mouth, which can effectively prevent the outer sheath of the cable from being worn.

Of course, the end of the first connection terminal 201 and the connector of the cable may be connected in other manners, for example, they may be connected by quick plugging or glue injection.

In one embodiment of the present application, as shown in fig. 7 and 8, the cable connection device includes a second cable connector 300. One end of the second cable connector 300 is connected to the first end 31 of the conductive shaft 3 in the torsion-proof connector 100, and the other end of the second cable connector 300 is used for connecting to another cable, such as the second lightning protection cable 500 in fig. 7 and 8.

The second cable connector 300 is fixed relative to the conductive shaft 3, and the second cable connector 300 and the conductive shaft 3 can rotate relative to the housing 1. In use, one end of the first cable connector 200 is connected to one cable and one end of the second cable connector 300 is connectable to another cable.

In one embodiment of the present application, as shown in fig. 8, the second cable connector 300 includes a first connector 301 and a second connection terminal 302. The first link 301 includes a link plate 3011, and a link cylinder 3012 connected to the link plate 3011. One end of the second connection terminal 302 is connected to the connection board 3011, and the other end of the second connection terminal 302 is used for being connected to a cable. The connecting cylinder 3012 is threadedly connected to the first end 31 of the conductive shaft 3.

Alternatively, the second connection terminal 302 may be a peep port terminal, and those skilled in the art will understand that one end of the peep port terminal is provided with a connection hole, and one end of the peep port terminal is used for connecting with a cable. The connection plate 3011 is connected to the end of the scope terminal, at which the connection hole is provided, by a second bolt 303 and a second nut 304.

Of course, the second connection terminal 302 and the connection board 3011 may be connected in other manners, for example, they may be connected by a piece-clamping manner.

In one embodiment of the present application, as shown in fig. 8, the cable connection device further includes a second protective sleeve 305, an end of the second connection terminal 302, and a connector of a cable, which are respectively inserted into the second protective sleeve 305 through two nozzles of the second protective sleeve 305 to be connected.

Optionally, the second protective sleeve 305 is made of a non-metal material, and the part where the second connection terminal 302 and the cable are combined with each other is fixed by means of rapid injection sleeving of the second protective sleeve 305, so that the cable joint is prevented from being deformed back and forth due to long-term pressure of the second protective sleeve 305, and further the cable joint is prevented from being worn.

In the second protective sleeve 305, the nozzle for inserting the joint of the cable may be designed as a bell mouth, which may effectively prevent the outer sheath of the cable from being worn.

Of course, the end of the second connection terminal 302 and the connector of the cable may be connected by other methods, for example, they may be connected by quick plugging or glue injection.

In one embodiment of the present application, as shown in fig. 8, the inner surface of the connector barrel 3012 includes an internally threaded section and an unthreaded section; the portion of the conductive shaft 3 extending into the connecting cylinder 3012 includes an externally threaded section and a smooth shaft section. The internal thread section is in threaded connection with the external thread section, and the non-threaded section is tightly attached to the optical axis section.

The tight fit of the non-threaded section and the optical axis section can ensure that the connecting cylinder 3012 and the conductive shaft 3 have good contact, and the reliability of current conduction between the two is improved. Alternatively, in order to further improve the reliability of the current conduction between the connection barrel 3012 and the conductive shaft 3, a portion of the conductive shaft 3 protruding into the connection barrel 3012 and the inner surface of the connection barrel 3012 may be coated with a conductive paste.

In one embodiment of the present application, as shown in fig. 7 and 8, the second cable connector 300 includes a pin 306, and the pin 306 is inserted into the connecting cylinder 3012 and a portion of the conductive shaft 3 extending into the connecting cylinder 3012. The pin 306 prevents the connecting cylinder 3012 and the conductive shaft 3 from being separated due to relative rotation, and plays a role in locking the conductive shaft 3.

Alternatively, dowel 306 may be a cotter pin.

The cable connection device provided by the embodiment of the present application has the same inventive concept and the same advantageous effects as those of the foregoing embodiments, and details that are not shown in the cable connection device may refer to the foregoing embodiments, and are not described herein again.

Based on the same inventive concept, the embodiment of the present application provides a wind turbine generator system, as shown in fig. 5 and fig. 6, the wind turbine generator system includes a hub (not shown in the drawings), a blade (not shown in the drawings), a pitch bearing (not shown in the drawings), a first lightning protection cable 400, and the cable connection device provided in some embodiments of the present application.

In the wind turbine generator system provided by the present embodiment, the cable connection device does not need to provide the second cable connector 300.

The hub is connected with the blades through a variable pitch bearing. One end of the first lightning protection cable 400 is connected to the blade, and the other end of the first lightning protection cable 400 is connected to the first cable connector 200 of the cable connection device. The cable connection device is fixed close to the center line of the blade or the pitch bearing.

The first lightning protection cable 400 and the cable connection means may be determined according to the number of blades, and generally, one first lightning protection cable 400 and one cable connection means are required to be provided for each blade.

The purpose of the fixation of the cable connection means close to the centre line of the blade or the pitch bearing is to avoid that the first lightning protection cable 400, the second lightning protection cable 500 and the cable connection means are in electrical contact with the pitch bearing. On the premise of meeting the above purpose, the installation manner of the cable connection device in the wind turbine generator set is not particularly limited.

When the blade is struck by lightning, the lightning current generated on the blade is transmitted to the conductive shaft 3 through the first lightning protection cable 400, the first cable connector 200 and the path shown by the arrow in fig. 3 in sequence. Because the cable connecting device and the first lightning protection cable 400 do not need to be in electrical contact with the pitch bearing, lightning current does not pass through the pitch bearing, the pitch bearing is thoroughly isolated outside a lightning current downlink path, and the hidden trouble that the lightning current damages the pitch bearing is eliminated.

When the blade is changed into the pitch, the first lightning protection cable 400 is twisted, and the torsion generated by the first lightning protection cable 400 can drive the conductive shaft 3 to rotate relative to the shell 1 and the conductive body 2, so that the torsion is effectively eliminated, that is, the twisting deformation of the first lightning protection cable 400 can be absorbed by the twisting prevention connector 100, and the first lightning protection cable 400 is prevented from being damaged due to twisting deformation.

In the wind turbine generator system provided by the embodiment of the application, the conductive shaft 3 and the conductive body 2 of the anti-twisting connector 100 can always keep a contact state under the action of the elastic force of the elastic member 4, the cable gravity and/or the centrifugal force no matter whether the hub rotates or not. Several conditions during rotation of the hub are exemplified below:

(1) in the process of rotating the hub, when the first lightning protection cable 400 is positioned below the cable connection device, the gravity and the centrifugal force of the first lightning protection cable 400 and the conductive shaft 3, and the elastic force of the elastic piece 4 drive the conductive shaft 3 to press the conductive body 2, so that the conductive shaft 3 and the conductive body 2 are kept in a contact state;

(2) in the process of rotating the hub, when the first lightning protection cable 400 and the cable connecting device are in a horizontal state, the centrifugal force of the first lightning protection cable 400 and the conductive shaft 3 and the elastic force of the elastic part 4 drive the conductive shaft 3 to press the conductive body 2, so that the conductive shaft 3 and the conductive body 2 are kept in a contact state;

(3) in the process of rotating the hub, when the first lightning protection cable 400 is located above the cable connection device, the centrifugal force of the first lightning protection cable 400 and the conductive shaft 3 and the elastic force of the elastic part 4 can overcome the gravity of the first lightning protection cable 400 and the conductive shaft 3, so that the conductive shaft 3 is driven to compress the conductive body 2, and the conductive shaft 3 and the conductive body 2 are kept in contact.

The wind generating set provided by the embodiment of the application has the same inventive concept and the same beneficial effects as the embodiments described above, and the content not shown in detail in the cable connection device can refer to the embodiments described above, and is not described again here.

Based on the same inventive concept, an embodiment of the present application provides a wind turbine generator system, as shown in fig. 7 and 8, the wind turbine generator system includes a hub (not shown in the drawings), a blade (not shown in the drawings), a pitch bearing (not shown in the drawings), a first lightning protection cable 400, a second lightning protection cable 500, and a cable connection device provided in some embodiments of the present application.

In the wind turbine generator system provided in this embodiment, the cable connection device at least includes the first cable connector 200, the second cable connector 300, and the anti-twisting connector 100 provided in the above embodiments of the present application.

The hub is connected with the blades through a variable pitch bearing. One end of the first lightning protection cable 400 is connected to the blade, and the other end of the first lightning protection cable 400 is connected to the first cable connector 200 of the cable connection device. One end of the second lightning protection cable 500 is connected to a designated position, and the other end of the second lightning protection cable 500 is connected to the second cable connector 300 of the cable connection device. The cable connection means is located close to the centre line of the blade or the pitch bearing.

The first lightning protection cable 400, the second lightning protection cable 500 and the cable connection means may be determined according to the number of blades, and generally, one first lightning protection cable 400, one second lightning protection cable 500 and one cable connection means are required to be provided for each blade.

In the process of installing the cable connection device to the wind turbine generator set, the tension of the first lightning protection cable 400 and the second lightning protection cable 500 may be appropriately adjusted so that the cable connection device can be maintained at a position close to the center line of the blade or the pitch bearing, thereby preventing the first lightning protection cable 400, the second lightning protection cable 500 and the cable connection device from being in electrical contact with the pitch bearing.

When the blade is struck by lightning, the lightning current generated on the blade is transmitted to the conductive shaft 3 through the first lightning protection cable 400, the first cable connector 200 and the path shown by the arrow in fig. 3 in sequence, and then transmitted to a designated position (such as the ground) through the first cable connector 200 and the first lightning protection cable 400. Because the cable connecting device, the first lightning protection cable 400 and the second lightning protection cable 500 do not need to be in electrical contact with the pitch bearing, lightning current does not pass through the pitch bearing, the pitch bearing is thoroughly isolated outside a lightning current downlink path, and the hidden danger that the lightning current damages the pitch bearing is eliminated.

When the blade is changed to the oar, first lightning protection cable 400 and second lightning protection cable 500 can twist reverse, and the torsion that first lightning protection cable 400 and second lightning protection cable 500 produced can order about conductive shaft 3 and rotate with respect to casing 1 and electric conductor 2 to eliminate torsion effectively, first lightning protection cable 400 and second lightning protection cable 500 twist reverse the cable deformation can be absorbed by anti-twist connector 100 promptly, thereby has avoided first lightning protection cable 400 to be twisted and warp and damaged.

(1) in the process of rotating the hub, the centrifugal force of the first lightning protection cable 400, the second lightning protection cable 500 and the cable connection device is smaller than the gravity of the first lightning protection cable, when a certain blade rotates to the highest point, the second lightning protection cable 500 configured on the blade falls down, and the conductive shaft 3 is pulled to press the conductive body 2, so that the conductive shaft 3 and the conductive body 2 are kept in a contact state;

(2) in the process of rotating the hub, the centrifugal force of the first lightning protection cable 400, the centrifugal force of the second lightning protection cable 500 and the centrifugal force of the cable connecting device are all smaller than the gravity of the first lightning protection cable, when a certain blade rotates to the highest point, the first lightning protection cable 400 configured on the blade rises, and the conductive shaft 3 is pulled to press the conductive body 2, so that the conductive shaft 3 and the conductive body 2 are kept in a contact state;

(3) in the process of rotating the hub, the centrifugal force of the first lightning protection cable 400, the second lightning protection cable 500 and the cable connection device is equal to the gravity of the first lightning protection cable, and at this time, the elastic member 4 drives the flange 33 of the conductive shaft 3 to press the conductive body 2, so that the conductive shaft 3 and the conductive body 2 are kept in a contact state.

By applying the embodiment of the application, at least the following technical effects can be realized:

1. in the connector of preventing turning round that this application embodiment provided, because the electric shaft can slide for casing and electric conductor along the axial of self, consequently the elastic component can order about the flange of electric shaft and compress tightly the electric conductor, prevents that casing, electric conductor and electric shaft from taking off for casing, electric conductor and electric shaft remain the contact all the time, form the passageway that is used for electrically conducting. When the two cables are respectively connected with the external connection end and the first end, the current in one cable can be transmitted to the other cable through the path. When the two cables are twisted relatively, the torsion generated by the two cables can drive the conductive shaft to rotate relative to the shell and the conductive body, so that the torsion is effectively eliminated, namely, the twisting deformation of the cables can be absorbed by the anti-twisting connector, and the cables are prevented from being damaged by twisting deformation.

2. In the anti-twist connector provided by the embodiment of the application, only one end face of the conductor is in contact with the flange of the conductive shaft between the conductor and the conductive shaft, so that unnecessary abrasion of other positions of the conductive shafts of the conductor is avoided, and meanwhile, the friction force born by the conductive shafts during rotation is also reduced.

In addition, the end face of the conductor and the end face of the flange are both circular ring surfaces, the two end faces are in contact, so that the axial stress of the conductor and the conductive shaft is more uniform, and the risk that the conductive shaft is blocked in the rotating process is reduced.

3. In the connector of preventing turning round that this application embodiment provided, first supporting ring can regard as the axial positioning benchmark of electric conductor and conducting shaft, has guaranteed that electric conductor and conducting shaft can keep coaxial for can keep first preset distance between the inner wall of electric conductor and the conducting shaft outer wall, avoid the two direct contact back to cause the structure card to die because of flashover forms the burn vestige on the surface.

Moreover, the self-lubricating function of the first support ring greatly reduces the friction between the conductive shaft and the first support ring, and the first support ring can be regarded as a sliding bearing capable of providing radial support for the first support ring, so that better feasible conditions are provided for the conductive shaft to slide relative to the shell and the conductive body along the axial direction of the conductive shaft.

4. In the anti-twist connector provided by the embodiment of the application, the friction between the first bearing and the housing is reduced to a great extent by the self-lubricating function of the second support ring, the first support ring can be regarded as a sliding bearing capable of providing radial support for the conductive shaft and the first bearing, and a better feasible condition is provided for the conductive shaft to slide relative to the housing and the conductive body along the axial direction of the conductive shaft.

5. In the anti-twist connector provided by the embodiment of the application, when the conductive shaft can rotate relative to the shell and the conductive body, the elastic part can synchronously rotate along with the conductive shaft and the bearing inner ring, so that the dynamic friction between the elastic part and the conductive shaft is avoided, and the abrasion of the elastic part is avoided.

6. The connector of preventing turning round that this application embodiment provided with holds consumptive material (electric conductor or flange) powder's cavity, along with the increase of the wearing and tearing volume of electric conductor, the axial length of electric conductor shortens, and the elastic component can order about the electric conduction axial to the electric conductor slip, can guarantee flange and electric conductor keep in contact on the one hand, and on the other hand has also further enlarged the volume of cavity for the cavity can hold more powder.

7. In the anti-twist connector provided by the embodiment of the application, along with the increase of the abrasion loss of the electric conductor or the flange, the elastic part can drive the electric conduction shaft to slide towards the electric conductor, so that the length of the electric conduction shaft exposed out of the shell part can be shortened, and a worker can determine the abrasion loss of the electric conductor or the flange according to the change of the length, so that the daily inspection of the anti-twist connector is very convenient.

8. In the cable connecting device that this application embodiment provided, protective case's material can be nonmetal, and binding post and cable mutually combined's position can realize fixedly through protective case's the mode that cup joints of moulding plastics fast, and this joint that can avoid the cable takes place to reciprocate to warp because of receiving first protective sleeve pressure for a long time, and then has avoided the joint wearing and tearing of cable.

In addition, in the protective sleeve, a pipe orifice for inserting a joint of the cable is a bell mouth, and the bell mouth can effectively prevent the outer skin of the cable from being abraded.

9. The cable connection device provided by the embodiment of the application can be applied to a wind turbine generator system, when a blade is struck by lightning, lightning current generated on the blade is transmitted to a conductive shaft through a first lightning protection cable, a first cable connector and a path shown by an arrow in fig. 3 in sequence. Because the cable connecting device and the first lightning protection cable do not need to be in electrical contact with the pitch bearing, lightning current does not pass through the pitch bearing, the pitch bearing is thoroughly isolated outside a lightning current downlink path, and the hidden trouble that the lightning current damages the pitch bearing is eliminated.

When the blade becomes the oar, first lightning protection cable (and second lightning protection cable) can take place to twist reverse, and the torsion that first lightning protection cable produced can order about the relative casing of conducting shaft and the electric conductor rotation to eliminate torsion effectively, the cable of twisting of first lightning protection cable warp can be absorbed by preventing turning round the connector promptly, thereby has avoided first lightning protection cable to be twisted and warp and damaged.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples. The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. An anti-twist connector (100) for connecting two cables, comprising: the device comprises a shell (1), a conductor (2), a conductive shaft (3) and an elastic piece (4);

the shell (1) is provided with an external connection end (15), and the external connection end (15) is used for being connected with a cable;

the electric conductor (2) is positioned in the cavity of the shell (1) and is connected with the shell (1);

the conductive shaft (3) is movably arranged in the shell (1) in a penetrating way; the first end (31) of the conductive shaft (3) is exposed out of the shell (1) and is used for being connected with another cable; the flange (33) on the conductive shaft (3) is positioned in the cavity of the shell (1) and is in contact with the electric conductor (2) along the axial direction of the conductive shaft (3);

the elastic piece (4) is located in the cavity of the shell (1), is in contact with the conductive shaft (3) and is used for driving the flange (33) of the conductive shaft (3) to press the conductor (2).

2. The anti-twist connector (100) according to claim 1, wherein the conductive body (2) is annular, the conductive body (2) is sleeved on the conductive shaft (3), and a first preset distance is kept between the inner wall of the conductive body (2) and the outer wall of the conductive shaft (3);

one end surface of the flange (33) is in contact with one end surface of the conductor (2) in the axial direction of the conductive shaft (3), and the other end surface of the conductor (2) is connected to the housing (1).

3. The twist-proof connector (100) according to claim 2, characterized in that the twist-proof connector (100) further comprises a first support ring (6);

the first supporting ring (6) is sleeved on the conductive shaft (3), is positioned in a radial gap between the inner wall of the conductive body (2) and the outer wall of the conductive shaft (3), and is respectively contacted with the conductive body (2) and the conductive shaft (3).

4. Anti-twist connector (100) according to claim 3, characterized in that said first support ring (6) is made of non-metallic material with self-lubricating function.

5. The anti-twist connector (100) according to claim 1, characterized in that the anti-twist connector (100) further comprises a first bearing (7);

the inner ring of the first bearing (7) is sleeved on the conductive shaft (3), and the outer ring of the first bearing (7) is abutted to the surface of the cavity of the shell (1).

6. The anti-twist connector (100) according to claim 5, characterized in that said anti-twist connector (100) further comprises a second support ring (8), said second support ring (8) being made of non-metallic material with self-lubricating function;

the second support ring (8) is arranged on the outer ring of the first bearing (7), and the outer ring is abutted to the surface of the cavity of the shell (1) through the second support ring (8).

7. Anti-twist connector (100) according to claim 5, characterized in that the electrical conductor (2) and the first bearing (7) are located on either side of the flange (33) in the axial direction of the electrical conductor shaft (3);

the elastic piece (4) is in a compressed state, one end of the elastic piece (4) is abutted against the flange (33), and the other end of the elastic piece (4) is abutted against the inner ring of the first bearing (7).

8. The torsion-proof connector (100) according to claim 1, wherein the flange (33) is a shoulder integrally formed on the conductive shaft (3), the hardness of the conductive shaft (3) is greater than that of the conductive body (2), and a second preset distance is kept between the outer wall of the flange (33) and the cavity surface of the housing (1);

or, the flange (33) is an annular member sleeved on the conductive shaft (3), the hardness of the flange (33) is greater than that of the conductive body (2), and a second preset distance is kept between the outer wall of the flange (33) and the cavity surface of the shell (1);

or, the flange (33) is an annular member sleeved on the conductive shaft (3), the hardness of the flange (33) is less than that of the conductive body (2), and a second preset distance is kept between the outer wall of the flange (33) and the cavity surface of the shell (1).

9. The anti-twist connector (100) according to claim 1, characterized in that the second end (32) of the electrically conductive shaft (3) is exposed to the housing (1);

the part, close to the second end (32), of the conductive shaft (3) exposed out of the shell (1) has a first preset length.

10. The anti-twist connector (100) according to claim 1, characterized in that the anti-twist connector (100) further comprises a sealing ring (9), the sealing ring (9) being sleeved on the conductive shaft (3);

the side wall of the shell (1) is provided with a shaft hole (14); the part of the sealing ring (9) is sleeved in the conductive shaft (3) and is arranged in the shaft hole (14).

11. The torsion-proof connector (100) according to claim 1, wherein the conductive body (2) and the elastic member (4) are respectively located on both sides of the flange (33) in the axial direction of the conductive shaft (3);

the elastic piece (4) is in a compressed state, one end of the elastic piece (4) is abutted against the flange (33), and the other end of the elastic piece (4) is abutted against the shell (1).

12. A cable connection arrangement, comprising a first cable connector (200), and an anti-twist connector (100) according to any one of claims 1-11;

one end of the first cable connector (200) is connected with an external connection end (15) of the shell (1) in the anti-twist connector (100), and the other end of the first cable connector (200) is used for being connected with a cable.

13. A cable connection device according to claim 12, wherein the first cable connector (200) comprises a first connection terminal (201), one end of the first connection terminal (201) being connected to the outer connection end (15), the other end of the first connection terminal (201) being adapted to be connected to the one cable.

14. The cable connection device according to claim 12 or 13, comprising a second cable connector (300);

one end of the second cable connector (300) is connected with the first end (31) of the conductive shaft (3) in the anti-twisting connector (100), and the other end of the second cable connector (300) is used for being connected with another cable.

15. A cable connection device according to claim 14, characterized in that the second cable connector (300) comprises a first connector (301) and a second connection terminal (302);

the first connecting piece (301) comprises a connecting plate (3011) and a connecting cylinder (3012) connected with the connecting plate (3011); one end of the second wiring terminal (302) is connected with the connecting plate (3011), and the other end of the second wiring terminal (302) is used for being connected with the cable; the connecting cylinder (3012) is in threaded connection with the first end (31) of the conductive shaft (3).

16. The cable connection arrangement of claim 15, wherein the inner surface of the connector barrel (3012) comprises an internally threaded section and an unthreaded section; the part of the conductive shaft (3) extending into the connecting cylinder (3012) comprises an external thread section and a smooth shaft section;

the internal thread section is in threaded connection with the external thread section, and the non-thread section is tightly attached to the optical axis section.

17. The cable connection device according to claim 15, wherein the second cable connector (300) comprises a pin (306), and the pin (306) is inserted into the connecting cylinder (3012) and a portion of the conductive shaft (3) extending into the connecting cylinder (3012).

18. A wind park according to any of the preceding claims, comprising a hub, a blade, a pitch bearing, a first lightning protection cable (400), and a cable connection device according to claim 12 or 13;

the hub is connected with the blades through the variable-pitch bearing;

one end of the first lightning protection cable (400) is connected with the blade, and the other end of the first lightning protection cable (400) is connected with a first cable connector (200) of the cable connection device;

the cable connection device is fixed close to the center line of the blade or the variable pitch bearing.

19. A wind power plant comprising a hub, a blade, a pitch bearing, a first lightning protection cable (400), a second lightning protection cable (500) and a cable connection arrangement according to any of claims 14 to 17;

the hub is connected with the blades through the variable-pitch bearing;

one end of the second lightning protection cable (500) is connected with a designated position, and the other end of the second lightning protection cable (500) is connected with a second cable connector (300) of the cable connecting device;

the cable connection means is located close to the centre line of the blade or the pitch bearing.