A gas-filled cable for high voltage cables and a high voltage cable

Abstract

The application discloses a kind of for high-voltage cable air charging device, including the first clamping block and the second clamping block for interconnection cooperation to hold high-voltage cable, the middle part of second clamping block is equipped with inner hole, inner hole is equipped with the air-permeable insulating gasket, the clamping surface of second clamping block and high-voltage cable are equipped with sealing pad, the middle part of sealing pad is equipped with through hole to be used to make the hole on high-voltage cable with inner hole communication, fixed seat is installed on second clamping block, air nozzle is installed on fixed seat, and the inner cavity of air nozzle is communicated with inner hole, fixed seat is also equipped with sealing cover, and air nozzle is located inside sealing cover to be used to isolate inner hole and external air.The application can realize the limiting and reliable sealing for the hole on high-voltage cable, prevent high-voltage cable from being damaged due to hole, solve the sealing problem under humid operating environment, and improve the insulation strength of air charging device through air-permeable insulating gasket, without affecting the air permeability.

Description

Technical Field

[0001] This invention relates to the field of power engineering, specifically to a gas charging / suppression device for high-voltage cables and a high-voltage cable. Background Technology

[0002] Chinese patent document CN113990568A discloses a high-voltage cable with air nozzles. It describes two or more air nozzles with valves installed on the outer wall of the cable body. The air nozzles communicate with cavities inside the cable body, and the valves are arranged in the pipe channels connecting the air nozzles and cavities. These air nozzles can be used to dehumidify and degas the high-voltage cable. However, how to create the opening without damaging the semi-conductive layer of the high-voltage cable is a challenge. After the opening, it needs to withstand humid operating environments and induced voltage in the cable. Another challenge is how to protect and withstand the pressure of the air intake / exhaust assembly. Summary of the Invention

[0003] The technical problem to be solved by the present invention is as follows: In view of the above-mentioned problems of the prior art, the present invention provides a gas charging and decompression device for high-voltage cables and a high-voltage cable. The present invention can achieve limiting and reliable sealing of the openings on the high-voltage cable, prevent the high-voltage cable from being damaged due to the openings, solve the sealing problem in humid operating environments, and improve the insulation strength of the gas charging and decompression device without affecting the ventilation capacity by using a ventilable insulating gasket.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A gas charging / discharging device for high-voltage cables includes a first clamping block and a second clamping block that are connected and fitted together to clamp the high-voltage cable. The second clamping block has an inner hole in its middle, and an air-permeable insulating gasket is provided in the inner hole. A sealing gasket is provided between the clamping surface of the second clamping block and the high-voltage cable. The sealing gasket has a through hole in its middle to communicate with an opening on the high-voltage cable and the inner hole. A fixing seat is installed on the second clamping block, and an air nozzle is installed on the fixing seat. The inner cavity of the air nozzle communicates with the inner hole. A sealing cover is also installed on the fixing seat, and the air nozzle is located inside the sealing cover to isolate the inner hole from the outside air.

[0006] Optionally, the breathable insulating pad has a cross-shaped groove on at least one side, and through holes at all four ends of the cross-shaped groove.

[0007] Optionally, the fixing seat is provided with a threaded post, and a first sealing ring is fitted at the root of the threaded post. The sealing cover is fitted on the threaded post and threadedly engaged with the threaded post. The first sealing ring is clamped and arranged between the sealing cover and the threaded post to isolate the air nozzle located inside the sealing cover from the outside air.

[0008] Optionally, a sealing groove is provided on the contact surface of the second clamping block located on the fixed seat, and a second sealing ring is embedded in the sealing groove to achieve a seal between the contact surfaces of the second clamping block and the fixed seat.

[0009] Optionally, the outer wall of the sealing cover is provided with anti-slip texture.

[0010] Optionally, the top of the sealing cap is provided with an end cap, and the end cap has a hollow double-layer structure.

[0011] Optionally, a detection module is also installed on the mounting base, and the detection module may be some or all of a pressure sensor, a temperature sensor, and a humidity sensor.

[0012] Optionally, both the clamping surfaces of the first clamping block and the second clamping block are provided with anti-slip threads.

[0013] Optionally, at least one side of the first clamping block and the second clamping block is provided with a connecting plate, and the connecting plates on both sides of the first clamping block and the second clamping block are connected by multiple connecting bolts.

[0014] A high-voltage cable includes a cable body with openings on its outer wall, and the aforementioned air charging / taking device for high-voltage cables is installed at the openings of the cable body.

[0015] Compared with the prior art, the present invention has the following main advantages:

[0016] 1. The present invention includes a first clamping block and a second clamping block for interconnecting and cooperating to clamp a high-voltage cable. The first clamping block and the second clamping block can be used to firmly clamp and fix the high-voltage cable, and provide good stress strength for sealing the openings on the high-voltage cable.

[0017] 2. The second clamping block of the present invention has an inner hole in the middle, and an air-permeable insulating gasket is provided in the inner hole. The air-permeable insulating gasket can improve the insulation strength of the air charging and taking device without affecting the air permeability.

[0018] 3. A sealing gasket is provided between the clamping surface of the second clamping block and the high-voltage cable. The sealing gasket has a through hole in the middle to connect the opening on the high-voltage cable with the inner hole. A fixing seat is installed on the second clamping block, and an air nozzle is installed on the fixing seat. The inner cavity of the air nozzle is connected to the inner hole. A sealing cover is also installed on the fixing seat, and the air nozzle is located inside the sealing cover to isolate the inner hole from the outside air. This can achieve limiting and reliable sealing of the opening on the high-voltage cable, prevent the high-voltage cable from being damaged due to the opening, and solve the sealing problem in a humid operating environment.

[0019] 4. The air nozzle of this invention is located inside the sealing cover, and the sealing cover can be easily removed for inflation or deflation. Attached Figure Description

[0020] Figure 1 This is a three-dimensional exploded structural diagram of the gas charging and extraction device of the present invention.

[0021] Figure 2 This is a partially enlarged cross-sectional view of the gas charging / taking device of the present invention installed on a high-voltage cable.

[0022] Figure 3 This is a three-dimensional structural diagram of the high-voltage cable of the present invention.

[0023] Legend: 1. First clamping block; 11. Connecting plate; 12. Connecting bolt; 2. Second clamping block; 20. Inner hole; 21. Ventilable insulating gasket; 211. Cross groove; 212. Through hole; 22. Sealing gasket; 23. Sealing groove; 24. Second sealing ring; 3. Fixing base; 31. Threaded post; 32. First sealing ring; 4. Air nozzle; 5. Sealing cap; 51. Anti-slip texture; 52. End cap; 6. Detection module; 7. Cable body; 71. Opening. Detailed Implementation

[0024] like Figure 1 and Figure 2 As shown, the gas charging / suction device for high-voltage cables in this embodiment includes a first clamping block 1 and a second clamping block 2 for interconnecting and cooperating to clamp the high-voltage cable. The second clamping block 2 has an inner hole 20 in the middle, and an air-permeable insulating gasket 21 is provided in the inner hole 20. A sealing gasket 22 is provided between the clamping surface of the second clamping block 2 and the high-voltage cable. The sealing gasket 22 has a through hole in the middle to connect the opening on the high-voltage cable with the inner hole 20. A fixing seat 3 is installed on the second clamping block 2, and an air nozzle 4 is installed on the fixing seat 3. The inner cavity of the air nozzle 4 is connected to the inner hole 20. A sealing cover 5 is also installed on the fixing seat 3, and the air nozzle 4 is located inside the sealing cover 5 to isolate the inner hole 20 from the outside air. The structure of the gas charging / suppressing device for high-voltage cables in this embodiment can achieve limiting and reliable sealing of the openings on the high-voltage cables, preventing cable damage due to the openings, solving the sealing problem in humid operating environments, and using the first clamping block 1 and the second clamping block 2 to achieve firm clamping and fixing of the high-voltage cables, providing good stress strength for sealing the openings on the high-voltage cables. The use of the ventilable insulating gasket 21 can improve the insulation strength of the gas charging / suppressing device without affecting the ventilation capacity. The sealing cover can be easily removed for gas charging / suppressing operations because the air nozzle 4 is located inside the sealing cover 5.

[0025] like Figure 2As shown, the ventilable insulating pad 21 has a cross groove 211 on at least one side, and a through hole 212 is provided at each of the four ends of the cross groove 211. Through the above structure, the through hole 212 of the cross groove 211 is staggered from the opening of the hole on the high-voltage cable. The cross groove 211 is composed of two intersecting slots that are perpendicular to each other. The slot openings face upwards. Since the side wall of the high-voltage cable is an arc surface structure, it can be ensured that at least one slot is in a non-compressed state during use and will open due to the arc surface structure. The slots are interconnected through the through holes 212 at both ends, which can make the pressure in the inner hole 20 more balanced and stable, and improve the ventilation capacity.

[0026] To facilitate the removal of the sealing cover 5 and ensure a seal between the sealing cover 5 and the fixing base 3, such as Figure 1 and Figure 2 As shown, in this embodiment, the fixed base 3 is provided with a threaded post 31, and a first sealing ring 32 is fitted at the root of the threaded post 31. The sealing cover 5 is fitted onto the threaded post 31 and threadedly engaged with it. The first sealing ring 32 is clamped between the sealing cover 5 and the threaded post 31 to isolate the air nozzle 4 located inside the sealing cover 5 from the external air. Through the threaded connection, the rotation of the threaded connection generates a compressive force on the first sealing ring 32. The first sealing ring 32 is interference-fitted with both the sealing cover 5 and the fixed base 3, making the seal between the sealing cover 5 and the fixed base 3 more reliable. Since the first sealing ring 32 is fitted at the root of the threaded post 31, it can be easily replaced once it ages.

[0027] To achieve a seal between the contact surfaces of the second clamping block 2 and the fixed seat 3, such as Figure 1 and Figure 2 As shown, a sealing groove 23 is provided on the contact surface of the second clamping block 2 located on the fixed seat 3, and a second sealing ring 24 is embedded in the sealing groove 23 to achieve sealing between the contact surfaces of the second clamping block 2 and the fixed seat 3.

[0028] To facilitate the removal of the sealing cap 5, such as Figure 1 As shown, the outer wall of the sealing cover 5 is provided with anti-slip texture 51, which makes the disassembly and installation of the sealing cover 5 more reliable. Figure 1 The anti-slip texture 51 is a grid pattern, but other textures can also be used as needed to achieve anti-slip properties.

[0029] like Figure 2 As shown, in this embodiment, the top of the sealing cap 5 is provided with an end cap 52, and the end cap 52 is a hollow double-layer structure to improve the pressure resistance of the end cap 52.

[0030] As an optional implementation, a detection module 6 is also installed on the mounting base 3. The detection module 6 can be a pressure sensor, a temperature sensor, and a humidity sensor, which can be used to conveniently monitor the temperature, humidity, and pressure of the buffer layer of the high-voltage cable, so as to further determine the operating status of the high-voltage cable.

[0031] In order to improve the clamping strength of the first clamping block 1 and the second clamping block 2 for the high-voltage cable, the clamping surfaces of the first clamping block 1 and the second clamping block 2 in this embodiment are provided with anti-slip threads.

[0032] like Figure 1 As shown, in order to improve the connection strength between the first clamping block 1 and the second clamping block 2, in this embodiment, at least one side of the first clamping block 1 and the second clamping block 2 is provided with a connecting plate 11, and the connecting plates 11 on both sides of the first clamping block 1 and the second clamping block 2 are connected by multiple connecting bolts 12. In addition, the first clamping block 1 and the second clamping block 2 can also be connected by a joint movable connection on one side and a bolt connection on the other side as needed.

[0033] like Figure 3 As shown, this embodiment also provides a high-voltage cable, including a cable body 7 with an opening 71 on its outer wall, and the aforementioned air charging / taking device for high-voltage cables is installed at the opening 71 of the cable body 7.

[0034] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A gas charging / discharging device for high-voltage cables, characterized in that, The device includes a first clamping block (1) and a second clamping block (2) for interconnecting and clamping a high-voltage cable. The second clamping block (2) has an inner hole (20) in the middle, and an air-permeable insulating gasket (21) is provided in the inner hole (20). A sealing gasket (22) is provided between the clamping surface of the second clamping block (2) and the high-voltage cable. The sealing gasket (22) has a through hole in the middle for communicating with the opening on the high-voltage cable and the inner hole (20). A fixing seat (3) is installed on the second clamping block (2), and an air nozzle (4) is installed on the fixing seat (3). The inner cavity of the air nozzle (4) is communicating with the inner hole (20). A sealing cover (5) is also installed on the fixing seat (3), and the air nozzle (4) is located inside the sealing cover (5) for isolating the inner hole (20) from the outside air.

2. The gas charging / taking device for high-voltage cables according to claim 1, characterized in that, The breathable insulating pad (21) has a cross groove (211) on at least one side, and a through hole (212) is provided at each of the four ends of the cross groove (211).

3. The gas charging / taking device for high-voltage cables according to claim 1, characterized in that, The fixed base (3) is provided with a threaded post (31), and a first sealing ring (32) is fitted at the root of the threaded post (31). The sealing cover (5) is fitted on the threaded post (31) and threadedly engaged with the threaded post (31). The first sealing ring (32) is clamped and arranged between the sealing cover (5) and the threaded post (31) to isolate the air nozzle (4) located inside the sealing cover (5) from the outside air.

4. The gas charging / taking device for high-voltage cables according to claim 1, characterized in that, The second clamping block (2) has a sealing groove (23) on the contact surface of the fixed seat (3), and a second sealing ring (24) is embedded in the sealing groove (23) to achieve sealing between the contact surfaces of the second clamping block (2) and the fixed seat (3).

5. The gas charging / taking device for high-voltage cables according to claim 1, characterized in that, The outer wall of the sealing cap (5) is provided with anti-slip texture (51).

6. The gas charging / taking device for high-voltage cables according to claim 1, characterized in that, The sealing cover (5) has an end cap (52) on its top, and the end cap (52) has a hollow double-layer structure.

7. The gas charging / taking device for high-voltage cables according to claim 1, characterized in that, The mounting base (3) is also equipped with a detection module (6), which is part or all of a pressure sensor, a temperature sensor, and a humidity sensor.

8. The gas charging / taking device for high-voltage cables according to claim 7, characterized in that, The clamping surfaces of the first clamping block (1) and the second clamping block (2) are both provided with anti-slip threads.

9. The gas charging / taking device for high-voltage cables according to claim 8, characterized in that, The first clamping block (1) and the second clamping block (2) are provided with a connecting plate (11) on at least one side, and the connecting plates (11) on both sides of the first clamping block (1) and the second clamping block (2) are connected by multiple connecting bolts (12).

10. A high-voltage cable, comprising a cable body (7) with an opening (71) on its outer wall, characterized in that, The cable body (7) is provided with an air charging / taking device for high-voltage cables as described in any one of claims 1 to 9 at the opening (71).

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