Connecting structure for incoming and outgoing line sleeve and lead and ring main unit

Abstract

The utility model belongs to the technical field of ring main units, and discloses a connecting structure for incoming and outgoing line sleeves and wires and a ring main unit. The connecting structure for the incoming and outgoing line sleeve and the wire comprises a connecting gasket, a voltage-sharing cover and a fastener. The connecting gasket is clamped between the wire and a nut of the bolt, the connecting gasket is provided with a through hole and a first mounting hole, and the bolt penetrates through the through hole of the connecting gasket. The voltage-sharing cover is provided with a cavity and a second mounting hole communicated with the cavity, the voltage-sharing cover is buckled at the joint of the wire and the wire inlet and outlet sleeve, and the connecting gasket and the nut of the bolt are both located in the cavity. The fastener is arranged in the first mounting hole and the second mounting hole in a penetrating mode at the same time so as to fix the voltage-sharing cover to the connecting gasket. According to the utility model, the installation of the voltage-sharing cover can be realized by selecting the fasteners which have small influence on the appearance of the voltage-sharing cover according to requirements, and the voltage-sharing cover is prevented from being fixed by using bolts, so that the voltage-sharing shielding effect of the voltage-sharing cover is not influenced, and the improvement of the insulation level is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of ring main unit technology, and in particular to a connection structure for inlet and outlet bushings and conductors, and a ring main unit. Background Technology

[0002] In ring main units, a common method to enhance the insulation performance of terminals is to use an equalizing cover to be installed at the terminals to optimize the electric field at the terminals, thereby improving the insulation level.

[0003] In existing technology, while the incoming and outgoing bushings and round copper busbars in a ring main unit are connected by fastening bolts, these bolts also pass through mounting holes in the equalizing cover to install the equalizing cover at the connection point of the bushings and busbars, thereby solving the problem of electric field distortion. However, due to the influence of the fastening bolts, the shape of the equalizing cover cannot be designed according to optimal requirements, resulting in a reduced equalizing effect and hindering the improvement of insulation levels. Utility Model Content

[0004] The purpose of this utility model is to provide a connection structure for inlet and outlet bushings and conductors, as well as a ring main unit, which is beneficial to improving the insulation level.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A connection structure for connecting the inlet / outlet bushing and the conductor, wherein the conductor is bolted to the inlet / outlet bushing, the connection structure for connecting the inlet / outlet bushing and the conductor includes:

[0007] A connecting washer is provided with a through hole and a first mounting hole, and the bolt passes through the through hole to clamp the connecting washer between the wire and the nut of the bolt;

[0008] The equalizing cover has a cavity and a second mounting hole communicating with the cavity. The equalizing cover is fastened to the connection between the wire and the inlet / outlet sleeve. The connecting gasket and the nut of the bolt are both located inside the cavity.

[0009] Fasteners are inserted into both the first and second mounting holes to secure the pressure equalizing cover to the connecting gasket.

[0010] As an alternative, the bolt is a hexagon socket head cap screw, which has an internal hexagon socket hole;

[0011] The inner wall of the cavity is provided with a positioning boss, which can be embedded in the internal hexagonal hole.

[0012] As an optional solution, the connecting gasket is provided with a first boss, and the first mounting hole is provided on the first boss;

[0013] The inner wall of the cavity is provided with a second protrusion, and the second mounting hole passes through the second protrusion, so that the second protrusion can fit with the first protrusion.

[0014] As an alternative, the connecting washer is provided with annular reinforcing ribs distributed around the through hole on the end face of the nut facing the bolt, and the first boss is provided on the annular reinforcing ribs.

[0015] As an alternative, a spring washer is fitted onto the bolt. The spring washer is located within the annular groove formed by the annular reinforcing ribs and is sandwiched between the connecting washer and the nut of the bolt.

[0016] As an alternative, the equalizing cover includes a cylindrical portion and spherical portions disposed at both ends of the cylindrical portion along the axial direction of the cylindrical portion. Along the axial direction of the cylindrical portion, the second mounting hole and the positioning boss are spaced apart on the cylindrical portion, and the spherical portions facing outward are provided with a clearance notch to avoid the wire.

[0017] As an alternative, the first mounting hole is a threaded hole, the fastener is a fastening screw, and the fastening screw passes through the second mounting hole and is connected to the threaded hole.

[0018] As an alternative, the second mounting hole is configured as a countersunk hole, and the nut of the fastening screw can be recessed into the countersunk hole.

[0019] As an alternative, the fastening screw is a Phillips head countersunk screw.

[0020] The ring main unit includes the connection structure for incoming and outgoing bushings and conductors as described in any of the above solutions.

[0021] The beneficial effects of this utility model are:

[0022] This utility model provides a connection structure for inlet / outlet bushings and conductors. By providing a through hole and a first mounting hole in the connecting gasket, a bolt is inserted into the through hole to clamp the connecting gasket between the conductor and the bolt nut. This allows the bolt to fix the connecting gasket while simultaneously fixing the conductor. Furthermore, the equalizing cover has a cavity and a second mounting hole communicating with the cavity, allowing fasteners to be inserted into both the first and second mounting holes to fix the equalizing cover to the connecting gasket. This structure allows for the selection of fasteners that have minimal impact on the shape of the equalizing cover, avoiding the need for bolts to fix it. This ensures that the equalizing shielding effect of the equalizing cover remains unaffected, thus improving the insulation level. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the connection structure for the inlet and outlet sleeves and wires provided in this embodiment of the utility model;

[0024] Figure 2 This is a cross-sectional view of the connection structure for the inlet and outlet sleeves and conductors provided in this embodiment of the utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the connecting gasket involved in the embodiment of this utility model;

[0026] Figure 4 This is a first structural schematic diagram of the pressure equalization shield involved in this embodiment of the utility model;

[0027] Figure 5 This is a schematic diagram of the second structure of the pressure equalization shield involved in the embodiment of this utility model.

[0028] In the picture:

[0029] 100. Wire; 200. Inlet / outlet sleeve; 300. Bolt; 301. Socket hexagonal hole;

[0030] 1. Connecting gasket; 11. Through hole; 12. First mounting hole; 13. First boss; 14. Annular reinforcing rib; 15. Annular groove;

[0031] 2. Pressure equalizing cover; 21. Cylindrical part; 211. Positioning boss; 212. Second boss; 213. Second mounting hole; 2131. Countersunk groove; 22. Spherical part; 221. Clearance notch;

[0032] 3. Fasteners;

[0033] 4. Spring washer. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] In a 24kV environmentally friendly gas-insulated ring main unit, the incoming and outgoing bushings 200 and the conductors 100 (i.e., round copper busbars) are fastened together by bolts 300. To address the problem of electric field distortion at the connection point between the incoming and outgoing bushings 200 and the conductors 100, such as... Figures 1-5 As shown, this utility model embodiment provides a connection structure for an inlet / outlet sleeve and a conductor, which includes a connecting gasket 1, a pressure equalizing cover 2, and a fastener 3. The connecting gasket 1 is sandwiched between the round copper busbar and the nut of the bolt 300. Specifically, the connecting gasket 1 has a through hole 11 and a first mounting hole 12. The bolt 300 passes through the through hole 11 of the connecting gasket 1. It is understood that the inlet / outlet sleeve 200 has a threaded hole, and the conductor 100 has a third mounting hole. The bolt 300 passes through the through hole 11 of the connecting gasket 1 and the third mounting hole of the conductor 100, and is threadedly connected to the threaded hole of the inlet / outlet sleeve 200, so that the connecting gasket 1 is fixedly sandwiched between the conductor 100 and the nut of the bolt 300. The equalizing cover 2 is provided with a cavity and a second mounting hole 213 communicating with the cavity. The equalizing cover 2 is fastened to the connection between the wire 100 and the inlet / outlet sleeve 200. The connecting gasket 1 and the nut of the bolt 300 are both located inside the cavity. The fastener 3 passes through both the first mounting hole 12 and the second mounting hole 213 to fix the equalizing cover 2 to the connecting gasket 1.

[0039] This connection structure for connecting conduits and conductors uses a connecting gasket 1 with a through hole 11 and a first mounting hole 12. A bolt 300 is inserted through the through hole 11 to clamp the connecting gasket 1 between the conductor 200 and the nut of the bolt 300. This allows the bolt 300 to fix the connecting gasket 1 while simultaneously fixing the conductor 100. Furthermore, the equalizing cover 2 has a cavity and a second mounting hole 213 communicating with the cavity, allowing a fastener 3 to be inserted into both the first mounting hole 12 and the second mounting hole 213 to fix the equalizing cover 2 to the connecting gasket 1. This structure allows for the selection of fasteners 3 that have minimal impact on the shape of the equalizing cover 2, avoiding the need for bolts 300 to fix the equalizing cover 2. This ensures that the equalizing shielding effect of the equalizing cover 2 is not affected, thus improving the insulation level.

[0040] It should be noted that since the main function of bolt 300 is to fix conductor 100, and the specifications of bolt 300 need to be selected according to the requirements of conductor 100 and cannot be changed arbitrarily, when the equalizing cover 2 is fixed by bolt 300, a second mounting hole 213 matching bolt 300 needs to be set on the equalizing cover 2. The specifications of bolt 300 are generally large, and the size of the second mounting hole 213 will affect the shape design of equalizing cover 2, thereby affecting the equalizing effect of equalizing cover 2.

[0041] To prevent the equalizing shield 2 from shifting during tightening, such as Figures 1-2 and combined Figure 4 As shown, bolt 300 can be selected as a hexagon socket head cap screw (i.e., a hexagon socket head cap flat head bolt), which has a hexagon socket hole 301. The equalizing cover 2 has a positioning boss 211 on the inner wall of the cavity. When the equalizing cover 2 is installed at the connection between the conductor 100 and the inlet / outlet sleeve 200, the positioning boss 211 can be embedded into the hexagon socket hole 301 of the bolt 300. The fastener 3 then passes through the first mounting hole 12 and the second mounting hole 213 to achieve the installation and fixation of the equalizing cover 2. This structure achieves two-point positioning through the fastener 3 and the positioning boss 211, effectively preventing the equalizing cover 2 from shifting.

[0042] Optionally, the positioning boss 211 can be cylindrical or rectangular.

[0043] To improve the connection strength between the equalizing cover 2 and the connecting gasket 1, such as Figures 3-4 As shown, the connecting gasket 1 is provided with a first boss 13, and the first boss 13 is provided with a first mounting hole 12; the equalizing cover 2 is provided with a second boss 212 on the inner wall of the cavity, and the second mounting hole 213 passes through the second boss 212 and communicates with the cavity. When the equalizing cover 2 is installed at the connection between the wire 100 and the inlet / outlet sleeve 200, the first boss 13 and the second boss 212 can fit together to provide support for the equalizing cover 2, which can effectively improve the fastening ability of the fastener 3.

[0044] Optionally, both the first boss 13 and the second boss 212 can be circular or rectangular.

[0045] Optionally, the first mounting hole 12 is a threaded hole, and the fastener 3 is a fastening screw. The fastening screw passes through the second mounting hole 213 and is threadedly connected to the threaded hole on the connecting washer 1, which facilitates installation.

[0046] Furthermore, referring to Figure 5 As shown, the second mounting hole 213 is a countersunk hole. When the fastening screw is threaded through the second mounting hole 213 and the threaded hole on the connecting washer 1, the nut of the fastening screw can be sunk into the countersunk groove 2131 of the countersunk hole, thus preventing the nut of the fastening screw from protruding from the outer surface of the pressure equalizing cover 2.

[0047] Optionally, the fastening screw can be a Phillips head countersunk screw. In this embodiment, an M4 Phillips head countersunk screw is used. Its end is small. Therefore, the countersunk groove 2131 on the outer surface of the equalizing cover 2 has little effect on the equalizing cover 2 and can be ignored according to the electric field simulation results.

[0048] To enhance the strength of connecting gasket 1, refer to... Figure 3 and combined Figures 1-2 As shown, the end face of the connecting washer 1 facing the nut of the bolt 300 is provided with annular reinforcing ribs 14 distributed around the through hole 11, and the first boss 13 is provided on the annular reinforcing ribs 14. By providing annular reinforcing ribs 14 on the connecting washer 1, the outer thickness of the connecting washer 1 can be effectively increased, the strength of the connecting washer 1 can be improved, and the annular reinforcing ribs 14 distributed around the through hole 11 can prevent the annular reinforcing ribs 14 from interfering with the nut of the bolt 300, that is, the dimension of the bolt 300 along its axial direction is not affected, and the nut of the bolt 300 is prevented from abutting against the inner wall of the pressure equalizing cover 2.

[0049] Furthermore, a spring washer 4 is provided on the bolt 300. The spring washer 4 is located within the annular groove 15 formed by the annular reinforcing rib 14. When the bolt 300 is tightened, the spring washer 4 is sandwiched between the connecting washer 1 and the nut of the bolt 300. By providing the spring washer 4, the loosening of the bolt 300 can be effectively prevented.

[0050] Optionally, such as Figures 4-5As shown, the equalizing cover 2 includes a cylindrical portion 21 and spherical portions 22 disposed at both ends of the cylindrical portion 21 along the axial direction of the cylindrical portion 21. Along the axial direction of the cylindrical portion 21, a second boss 212 and a positioning boss 211 are disposed at intervals on the cylindrical portion 21. A second mounting hole 213 passes through the second boss 212, that is, the second mounting hole 213 and the positioning boss 211 are disposed at intervals on the cylindrical portion 21. The spherical portion 22 facing outward is provided with a clearance notch 221 for avoiding the guide wire 100. When the equalizing cover 2 is fastened at the connection between the conductor 100 and the inlet / outlet sleeve 200, the conductor 100 extends outward through the clearance notch 221, the positioning boss 211 is embedded in the hexagonal hole 301 of the internal hexagonal bolt 300, the second boss 212 and the first boss 13 are in contact, and by setting the equalizing cover 2 as an elongated sphere, the outer surface of the equalizing cover 2 has a large radius of curvature, which improves the roundness of the outer surface of the equalizing cover 2 and further improves the equalizing effect; and the round surface design of the outer surface of the equalizing cover 2 reduces the occurrence of voltage concentration.

[0051] When conducting electric field simulation tests on the equalizing shield 2 used in the connection structure for incoming and outgoing bushings and conductors, it was found that the equalizing shield 2 has a more significant electric field shielding effect compared to the existing equalizing shield 2, which effectively improves the insulation performance.

[0052] This utility model also provides a ring main unit, including the above-mentioned connection structure for the incoming and outgoing bushings and conductors, which improves the problem of electric field distortion and enhances insulation performance.

[0053] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A connection structure for an inlet and outlet bushing and a conductor, the conductor (100) being mounted to the inlet and outlet bushing (200) by means of a bolt (300), characterized in that, The connecting structure for the incoming and outgoing line sleeve and the wire comprises: a connecting gasket (1) provided with a through hole (11) and a first mounting hole (12), the bolt (300) is arranged in the through hole (11) to clamp the connecting gasket (1) between the wire (100) and the nut of the bolt (300); a pressure equalizing cover (2) provided with a cavity and a second mounting hole (213) communicating with the cavity, the pressure equalizing cover (2) is buckled on the connecting part of the wire (100) and the incoming and outgoing line sleeve (200), the connecting gasket (1) and the nut of the bolt (300) are located in the cavity; a fastener (3) arranged in the first mounting hole (12) and the second mounting hole (213) to fix the pressure equalizing cover (2) to the connecting gasket (1).

2. The connection structure for an access line bush and a conductor wire according to claim 1, characterized by, The bolt (300) is an internal hexagonal bolt, which has an internal hexagonal hole (301); The inner wall of the cavity is provided with a positioning boss (211), which can be embedded in the internal hexagonal hole (301).

3. The connection structure for an access line bush and a conductor wire according to claim 1, characterized by The connecting gasket (1) is provided with a first boss (13), and the first mounting hole (12) is arranged on the first boss (13); The inner wall of the cavity is provided with a second boss (212), and the second mounting hole (213) penetrates through the second boss (212), and the second boss (212) can be attached to the first boss (13).

4. The connection structure for an access line bush and a conductor wire according to claim 3, characterized by The end surface of the connecting gasket (1) towards the nut of the bolt (300) is provided with an annular reinforcing rib (14) distributed around the through hole (11), and the first boss (13) is arranged on the annular reinforcing rib (14).

5. The connection structure for an access line bush and a conductor wire according to claim 4, characterized by A spring washer (4) is arranged on the bolt (300), and the spring washer (4) is located in a ring groove (15) formed by the annular reinforcing rib (14) and clamped between the connecting gasket (1) and the nut of the bolt (300).

6. The connection structure for an access wire bushing and a wire according to Claim 2, wherein The pressure equalizing cover (2) comprises a cylindrical part (21) and a spherical part (22) arranged at both ends of the cylindrical part (21) along the axis direction of the cylindrical part (21), the second mounting hole (213) and the positioning boss (211) are arranged at the cylindrical part (21) along the axis direction of the cylindrical part (21), and the spherical part (22) towards the outside is provided with a avoiding notch (221) avoiding the wire (100).

7. The connection structure for an access line bush and a conductor wire according to Claim 1, wherein The first mounting hole (12) is a threaded hole, the fastener (3) is a fastening screw, and the fastening screw is arranged in the second mounting hole (213) and connected with the threaded hole.

8. The connection structure for an access line bush and a conductor wire according to claim 7, characterized by The second mounting hole (213) is arranged as a countersunk hole, and the nut of the fastening screw can be sunk into the sink groove (2131) of the countersunk hole.

9. The connection structure for an access line bush and a conductor wire according to claim 8, characterized by The fastening screw is a cross countersunk screw.

10. Ring main unit, characterized in that The connecting structure for the incoming and outgoing line sleeve and the wire comprises any one of claims 1-9.

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