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Patent Searching and Data


Title:
COUPLING BOLT FOR HIGH-CURRENT CONNECTORS
Document Type and Number:
WIPO Patent Application WO/2019/129651
Kind Code:
A1
Abstract:
The invention relates to a coupling bolt (1) for coupling two in particular angled high-voltage connectors (42) having an oblong base body (2), which has an opening (14) that extends from one end (24) in the longitudinal direction (L) and an opening (14a) that extends from the opposite end (18) counter to the longitudinal direction (L), has at least one internal thread (16, 16a) formed in the openings (14, 14a), which is provided with a screw head drive (26) for coupling to an operating point of a bit tool, the screw head drive (26) being arranged in the opening (14) between the end (24) of the opening (14) and the internal thread (16). Moreover, the invention relates to an arrangement (44) having at least two in particular angled high-voltage connectors (42), a coupling bolt (1) being arranged between the two high- voltage connectors (42). By positioning the screw head drive (26) between the internal thread (16) and the end (24) of the opening (14), simple mounting of the coupling bolt (1) is possible, even when space is limited. By using a screw head drive (26) driven by a bit, it is possible to produce a coupling bolt (1) having a maximum outer diameter (13), so that maximum current transmission takes place via the cross- section of the coupling bolt (1).

Inventors:
HARDI MARKUS (DE)
Application Number:
EP2018/086256
Publication Date:
July 04, 2019
Filing Date:
December 20, 2018
Export Citation:
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Assignee:
TYCO ELECTRONICS RAYCHEM GMBH (DE)
International Classes:
H01R4/30; H01R4/56; H01R13/53
Foreign References:
US4857021A1989-08-15
US20160141801A12016-05-19
Other References:
None
Attorney, Agent or Firm:
MURGITROYD & COMPANY (GB)
Download PDF:
Claims:
Claims

1. A coupling bolt (1) for coupling two in particular angled high-voltage connectors (42) having an oblong base body (2), which has an opening (14) that extends from one end (24) in the longitudinal direction (L) and an opening (14a) that extends from its other end (18) counter to the longitudinal direction (L), has at least one internal thread (16, 16a) formed in the openings (14), and which is provided, in an opening (14), with a screw head drive (26) for coupling to an operating point of a bit tool, characterised in that at least one screw head drive (26) is arranged in the opening (14) between the end (24) of the opening (14) and the internal thread (16).

2. The coupling bolt (1) according to Claim 1, characterised in that the coupling bolt (1) is cylindrical. 3. The coupling bolt (1) according to Claim 1 or 2, characterised in that the coupling bolt (1) has at least one countersink (32) that opens into an opening (14, 14a).

4. The coupling bolt (1) according to any one of Claims 1 to 3, characterised in that the coupling bolt (1) has a further screw head drive (26a).

5. An arrangement (44) having at least two in particular angled high-voltage connectors (42), characterised in that a coupling bolt (1) according to any one of Claims 1 to 4 is arranged between the angled high voltage connectors (42).

6. The arrangement (44) according to Claim 5, characterised in that at least one fastening screw (22a) is screwed in the coupling bolt (1), said fastening screw having a shoulder (78).

7. The arrangement (44) according to Claim 5 or 6, characterised in that the high-voltage connectors (42) each have a cable lug (12), between which the coupling bolt (1) is arranged.

8. The arrangement (44) according to Claim 7, characterised in that at least one cable lug (12) is clamped between a screw lock (86) and the coupling bolt (1).

Description:
Coupling bolt for high-current connectors

The invention relates to a coupling bolt for coupling two in particular angled high-voltage connectors. The coupling bolt comprises an oblong base body, which has an opening that extends in the longitudinal direction from one end and an opening that extends counter to the longitudinal direction from the opposite end, in which openings at least one formed internal thread is arranged, and which is provided with at least one screw head drive for coupling to an operating point of a bit tool. Furthermore, the invention relates to an arrangement having at least two in particular angled high-voltage connectors.

For high-voltage installations, cables are connected to a switching system. For this purpose, the cables are coupled to a switching system by means of a bushing. Since the number of bushings on a switching system, and space, is limited, it is advantageous if several cables can be connected to a bushing. Furthermore, the connection needs to be electrically insulated to the outside. For this purpose, e.g. angled high-voltage connectors are used, which have an opening for the cable end and an opening for connection to the socket. Moreover, the high-voltage connector can have a further opening for coupling to a further high-voltage connector. These connectors are known as symmetrically constructed T- connectors or asymmetrically constructed T-connectors or L-connectors.

For the coupling of two connectors, a coupling bolt is used, which conducts the current from the switching system to the second connector via the bushing and the first connector. For this purpose, the coupling bolt needs to have a high current transmission rate, and needs to be simple to mount while also saving space. Thus, it is the object of the invention to provide a coupling bolt having a maximum current transmission rate, which is simple to produce and can be mounted in a space-saving manner.

The object is achieved according to the invention, for the coupling bolt mentioned at the outset, in that the screw head drive is arranged in at least one opening between the end of the opening and the internal thread. The screw head drive is arranged between the end of the through-hole and the internal thread, as a result of which a tool with its operating point can be inserted deeply into the screw head drive relatively easily, so that mounting is facilitated and the coupling bolt can have a large contact surface, since the through-hole does not have to be expanded in order to allow the coupling of the operating point of a tool to the screw head drive. The object according to the invention is also achieved by the arrangement mentioned at the outset, in that a coupling bolt, as is described above and below, is arranged between the two connectors.

The solution according to the invention can be further improved by various configurations which are advantageous per se and which can be combined with one another as desired. These configurations and the advantages associated with them shall be explored in greater detail hereinafter.

According to a first advantageous configuration, the screw head drive can be a hexagon socket, whereby simple mounting is possible when space is limited. By using e.g. an Allen key, in particular having a spherical head, the coupling bolt can be screwed in simply, even when the tool engages at an angle.

According to a further advantageous configuration, the screw head drive can be a Torx drive. When using a Torx screw head drive, it is possible to transmit a high torque and at the same time avoid the risk of the screw head drive turning round. The turning round would lead to the operating point of the tool no longer being coupled to the screw head drive, and thus mounting and unmounting of the coupling bolt would no longer be possible.

The openings that extend from the respective ends can be arranged coaxially or eccentrically depending on the coupling bolt geometry. The openings can have the same diameter.

In a further configuration, the two openings which extend from the respective ends can be continuous, so that the coupling bolt is penetrated by a through-hole. When using a through-hole, the user has greater flexibility when selecting the depth of insertion of the fastening screw.

In order to reduce the manufacturing costs, the coupling bolt can have a cylindrical form. This makes it possible to produce the coupling bolt by turning. Preferably the coupling bolt has the form of a straight circular cylinder. As a result, when the cable end of a connector is coupled to the coupling bolt, a maximum size of contact surface is produced. The current can be conducted further to the next cable end via the cross-sectional area of the circular cylinder. Since in the case of a circular cylinder the maximum possible contact surface is achieved, the maximum possible current is thus transmitted. In a further configuration, the cross-sectional area can take up over 90% of the total cross-section of the coupling bolt. It is thereby possible to transmit current with a high current intensity of e.g. up to 2400 A.

In order to obtain good electrical conductivity, the coupling bolt can be composed of copper, preferably electrolytic copper. In order to prevent oxidation at the surface of the coupling bolt, the coupling bolt can be coated, at least at the contact surfaces, with a corrosion-resistant coating, preferably with a tin coating. The coating is for example 10 pm thick and can be made up of multiple layers.

According to a further advantageous configuration, the coupling bolt can have, at at least one end, a countersink that opens into the opening. This countersink can be used to receive a shoulder of a screw or a nut. Advantageously, the countersink is arranged between the screw head drive and the end of the coupling bolt lying next to the screw head drive. As a result, e.g. nuts can be inserted into the countersink in such a way that they never project out over the end face after mounting, even under all tolerance configurations. The coupling bolt can have a further screw head drive, which can be formed e.g. as a hexagon head at the shell surface of the coupling bolt. If a higher torque is necessary or if the first screw head drive is damaged e.g. by turning round, the second screw head drive can serve as a replacement. The second screw head drive can be arranged at the same end as the first screw head drive or at the opposite end. If the screw head drive is arranged at the opposite end, the mounting direction can be chosen as desired, depending on the usage requirements.

In order to simplify the release of the coupling bolt, the coupling bolt can have a further screw head drive at its shell surface. For this purpose, the circular cylinder can have at least two segment-shaped cutouts arranged parallel to each other, so that the circular cylinder has two parallel planar surfaces on its shell surface, which planar surfaces can be brought into engagement using e.g. a spanner. The second screw head drive can be arranged on the same side as the first screw head drive or on the opposite side. The second screw head drive preferably cannot abut a contact surface of the coupling bolt. This avoids the contact surface being reduced by the cutout.

According to a further advantageous configuration, the outer diameter of the coupling bolt can be adapted in the best possible way to the maximum space available and for example can be between 40 and 60 mm in size. This allows a large contact surface between the coupling bolt and the high-current connector, which e.g. has the form of a cable lug. Furthermore, the coupling bolt with these dimensions can thereby be received in an insulating housing, which electrically insulates the connectors and the socket to the outside. According to a further advantageous configuration, the length of the coupling bolt can be between 50 and 200 mm depending on the voltage class of the connectors and their design and/or construction space.

The arrangement can have at least one fastening screw, which couples the coupling bolt to a connector. In one configuration, the connector can have a cable lug, the eyelet of which aligns with the through- hole of the coupling bolt. A cable lug makes a simple screw connection of the connector and the bushing and/or the coupling bolt possible.

According to a further advantageous configuration, a fastening screw can be screwed in the coupling bolt, said fastening screw having a shoulder. The shoulder here can restrict the screwing-in of the fastening screw into the coupling bolt. Preferably, the depth of the countersink can correspond to the width of the shoulder. As a result, upon complete screwing-in, the shoulder is inserted flush or recessed into the countersink, so that the coupling bolt with its contact surface can always lie directly against the cable lug of the connector.

According to a further advantageous configuration, the fastening screw can have a screw head drive for coupling of the coupling bolt to the connector, whereby the screwing-in of the fastening screw is facilitated.

In a further advantageous configuration, the fastening screw can be secured using a screw lock. In order to guarantee secure contacting of the coupling bolt to a connector, the connector can be fixed between the coupling bolt and the screw lock. As a result, the coupling does not come undone even under strong vibrations.

The screw lock can be configured e.g. in the form of a washer and nut. If it is desired to couple a coupled high-voltage connector to a further high-voltage connector, the screw lock can be produced in the form of an additional coupling bolt. For the connection of a high-voltage connector to the bushing of a switching system, the bushing serves as a screw lock, which clamps the cable end between it and the coupling bolt.

Hereinafter, the invention is explained in greater detail by way of example using advantageous configurations with reference to the drawings. The advantageous further developments and configurations depicted here are each independent of one another and can be freely combined with one another, depending on how this is necessary in the specific application. In the drawings:

Fig. 1 shows a schematic perspective view of a coupling bolt according to the invention;

Fig. 2 shows a schematic sectional view of the coupling bolt depicted in Fig. 1;

Fig. 3 shows a schematic perspective view of a further coupling bolt according to the invention;

Fig. 4 shows a schematic sectional view of an arrangement according to the invention; and

Fig. 5 shows a schematic side view of a fastening screw.

A schematic perspective view of a coupling bolt 1 according to the invention is depicted in Fig. 1. Furthermore, the coupling bolt 1 of Fig. 1 is shown in a schematic sectional view in Fig. 2, sectioned in the longitudinal direction L. The coupling bolt 1 has an oblong base body 2 in the form of a straight circular cylinder 4. The length 5 of the coupling bolt 1 in this exemplary configuration is between 100 and 200 mm at a voltage level of 72 kV. The circular surfaces 6 of the cylinder serve as a contact surface 8 for contacting with an electrical conductor 10, which can be formed e.g. as a cable lug 12. The outer diameter 13 of the coupling bolt 1 fully utilises the available cross-sectional area and can be between 40 and 60 mm at a voltage class of 72 kV. From one end 24, an opening 14 extends in the longitudinal direction L, which opening is arranged coaxially with respect to the opening 14a, which extends from the opposite end 18 counter to the longitudinal direction L. The openings 14, 14a are in each case provided with an internal thread 16, 16a. The openings 14, 14a are interconnected in this configuration, as a result of which the coupling bolt is penetrated by a through-hole 15.

Between the internal threads 16 and 16a, a thread-free region 20 is arranged in the through-hole 15. The thread-free region 20 delimits the screw-in length of a fastening screw 22, if this can be screwed in from one of the two ends 18, 24.

Between the end 24 and the internal thread 16, the through-hole 15 is provided with a screw head drive 26, which, in this exemplary configuration, has the form of a hexagon socket 28 with a standardised width across flats 29 of e.g. WAF 17. Between the hexagon socket 28 and the end 24, the through-hole 14 widens in the form of a step 30, so that the coupling bolt 1 has, at the end 24, a planar countersink

32 which opens into the through-hole 15. The planar countersink 32 has a diameter 33, runs in the longitudinal direction L from the hexagon socket 28 to the end 24 of the through-hole 15 and has the depth 35. The contact surfaces 8 have, at their outer edges 34, a chamfer 36 that can serve as an introduction guide for the coupling bolt 1 and helps to protect the surfaces of the other components from damage.

At its end 18 away from the hexagon socket 28, the coupling bolt 1 has, at its shell surface 38, two flattened regions 40 produced by cutting out segments of a circle that are arranged parallel and preferably of the same size, which flattened regions extend from the outer edge 34 of the end 18 counter to the longitudinal direction L These flattened regions 40 serve as a second screw head drive 26a, by means of which the coupling bolt 1 can be screwed securely to a high-voltage connector 42. The flattened regions 40 extend counter to the longitudinal direction L, so that e.g. a spanner (not shown) can be brought into engagement with the coupling bolt 1. By positioning the hexagon socket 28 between the internal thread 16 and the end 24, simple mounting of the coupling bolt 1 is possible. The screw head drive 26 is simple to reach, and the tool (not shown) does not have to penetrate deeply into the coupling bolt 1 in order to bring its operating point into engagement with the screw head drive 26. By way of the second screw head drive 26a, which is formed by the flattened regions 40, the mounting direction can be chosen as desired by the user. A schematic perspective view of a further coupling bolt 1 according to the invention is depicted in Fig. 3.

In this case, the flattened regions 40 do not extend from the outer edge 34 of the end 18 counter to the longitudinal direction L, but rather are arranged at a distance from this end. As a result, the end contact surface is not reduced, which brings advantages in the case of current transmission and mechanical stability. In Fig. 4, an arrangement 44 according to the invention is depicted in a schematic sectional view, having two high-voltage connectors 42 and a coupling bolt 1, which couples the high-voltage connectors 42 to each other.

The arrangement 44 has a base connector 46 and a coupling connector 48. Both connectors 46, 48 have a T-shaped housing 50, in the stem 52 of which in each case a high-voltage cable 54 is inserted. The high-voltage cables 54 in each case terminate in a cable lug 12, which projects into the horizontal region 56 of the respective T-shaped housing 50.

The T-shaped housing 50 of the base connector 46 has, at its respective arms 58, 58a, a receptacle 60, 60a that tapers to the middle. A socket 62 with a fastening screw 22 is inserted into the receptacle 60 facing away from the coupling bolt 1. The fastening screw 22 penetrates the eyelet opening 64 of the cable lug 12 and is provided with an external thread 66, onto which the coupling bolt 1 is screwed by its internal thread 16a. As a result, the cable lug 12 is clamped between socket 62 and coupling bolt 1.

The coupling bolt 1 was screwed securely to the cable lug 12, and thus also to the base connector 46, using a tool (not shown), the operating point of which can be brought into engagement with the hexagon socket 28. The coupling bolt 1 in this case is inserted into the arm 58 of the base connector 46 until the contact surface 8 abuts the cable lug 12.

At an end 24 of the through-hole 15, away from the base connector 46, a further fastening screw 22a is screwed in, the schematic side view of which is depicted in Fig. 5.

The fastening screw 22a has a front end 70 and a rear end 72. At its front end 70, the fastening screw 22a is provided with the external thread 73, so that it can be screwed into the internal thread 16 of the coupling bolt 1. For this purpose, the fastening screw 22 has a screw head drive 75 at the rear end 72.

A thread-free section 74 runs in the longitudinal direction L from the external thread 73 of the front end 70, which thread-free section has a smaller diameter than the front end 70. The transition from the front end to the thread-free section 74 is formed by a chamfer 36. The thread-free section 74 extends in the longitudinal direction L as far as a shoulder 78, the width 83 of which in the longitudinal direction L matches the depth 35 of the planar countersink 32 of the coupling bolt 1. The diameter 82 of the shoulder 78 is designed to correspond to the diameter 33 of the planar countersink 32. As a result, the shoulder 78 lies flush in the planar countersink 32 when the fastening screw 22 is screwed in completely and does not stand proud of the surface 6, such that the electrical contacting and the mechanical fastening of the surface 6 to the surface of the cable lug 12 is not impaired.

A thread-free through-section 84, which is inserted in the eyelet opening 64a of the cable lug 12 of the coupling connector 48, extends in the longitudinal direction L from the shoulder 78 to the rear end 72. The thread-free through-section 84 is optional and can be omitted in other embodiments of the fastening screw. From the through-section 84 to the rear end 72, the fastening screw 22a is provided with an external thread 73a, which serves for receiving a screw lock 86. As a result, a screw lock 86 can be screwed on and can clamp the cable lug 12 between the contact surface 8 of the coupling bolt and the screw lock 86. In Fig. 4, the screw lock 86 is depicted as a nut 88. If a further coupling connector 48 is to be coupled, a further coupling bolt 1 can serve as a screw lock 86, so that the cable lug 12 is clamped between two coupling bolts 1. The coupling connector 48 has an arm 89 with a coupling region 90, the outer contour 92 of which tapers towards the outside, so that it can be inserted into the opening 60a of the base connector 46. Furthermore, the coupling region 90 has a cylindrical bolt receptacle 94, into which the coupling bolt 1 is received. The coupling connector 48 has, at its arm 89a away from the base connector 46, a receptacle 96 which is designed analogously to the receptacle 60a of the base connector. A further coupling connector (not shown) can thereby be coupled to the coupling connector 48.

Reference symbols

1 coupling bolt

2 base body

4 circular cylinder

5 length

6 circular surface

8 contact surface

10 electrical conductor

12 cable lug

13 outer diameter

14, 14a opening

15 through-hole

16, 16a internal thread

18 opposite end

20 thread-free region

22, 22a fastening screw

24 end

26, 26a screw head drive

28 hexagon socket

30 step

32 planar countersink

33 diameter

34 outer edge

35 depth

36 chamfer

38 shell surface

40 flattened region

42 high-voltage connector

44 arrangement

46 base connector

48 coupling connector

50 T-shaped housing

52 stem 54 high-voltage cable

56 horizontal region

58, 58a arm

60, 60a receptacle

62 socket

64 eyelet opening

66 external thread

68 netting tube

70 front end

72 rear end

73, 73a external thread

74 thread-free section

78 shoulder

82 diameter

83 width

84 through-section

86 screw lock

88 nut

89 arm

90 coupling region

92 outer contour

94 bolt receptacle

L longitudinal direction