A high-voltage cable head sealing device

Abstract

This invention discloses a high-voltage cable head sealing device, belonging to the field of cable technology. It includes sealing components fixedly connected to the outer wall of the high-voltage cable on both sides of the cable joint. A corrosion-resistant outer shell is sealed between the two sealing components, and a sealing layer is filled inside the corrosion-resistant outer shell. Each sealing component includes an integrally connected straight cylinder and a reducing cylinder. The outer diameter of the reducing cylinder gradually decreases from the end closer to the cable joint to the end farther away from the cable joint. Connectors are provided at both ends of the corrosion-resistant outer shell. The inner wall of the connector fits against the outer wall of the reducing cylinder, and the length of the connector is less than the length of the reducing cylinder. This invention, employing the above-described structure, provides a high-voltage cable head sealing device that ensures sealing and corrosion resistance through a multi-layer sealing structure.

Description

Technical Field

[0001] This invention belongs to the field of cable technology, and in particular relates to a high-voltage cable head sealing device. Background Technology

[0002] Cable joints, also known as cable terminations, are the points where sections of a cable, after being laid, must be connected to form a continuous line. These connections are called cable joints. Cable joints located in the middle of a cable line are called intermediate joints, while those at the ends of the line are called terminal joints.

[0003] To prevent moisture from seeping into the gap between the high-voltage cable and the connector and affecting the cable connection, a sealing device is needed to ensure the cable head is sealed. Existing high-voltage cable connectors use thermoplastic corrosion-resistant sleeves for insulation and sealing. However, the thermoplastic sleeves themselves are prone to scratches and damage, affecting the overall sealing and corrosion resistance of the cable.

[0004] To solve the above problems, a new type of high-voltage resistant cable head sealing device is needed. Summary of the Invention

[0005] The purpose of this invention is to provide a high-voltage cable head sealing device that ensures sealing and corrosion resistance through a multi-layer sealing structure.

[0006] To achieve the above objectives, the present invention provides a high-voltage cable head sealing device, comprising sealing elements fixedly connected to the outer wall of a high-voltage cable on both sides of a cable joint, a corrosion-resistant outer shell sealingly connecting the two sealing elements, the corrosion-resistant outer shell being filled with a sealing layer, each sealing element comprising an integrally connected straight cylinder and a reducing cylinder, the outer diameter of the reducing cylinder gradually decreasing from one end near the cable joint to the other end away from the cable joint, and connectors provided at both ends of the corrosion-resistant outer shell, the inner wall of the connector fitting against the outer wall of the reducing cylinder, the length of the connector being less than the length of the reducing cylinder.

[0007] Preferably, the anti-corrosion shell includes a right cylinder and a left cylinder. The right cylinder has a protruding ring on its end face near the left cylinder, and the left cylinder has an annular slot on its end face near the right cylinder. A spring is provided in the annular slot. One end of the spring is fixedly connected to the inner end of the annular slot, and the other end of the spring abuts against the protruding ring. When the protruding ring is fully inserted into the annular slot, the spring is in a compressed state.

[0008] Preferably, rubber sealing gaskets are fixedly connected to both the inner and outer curved walls of the convex ring.

[0009] Preferably, a flared auxiliary component is integrally connected to the side of the variable diameter cylinder away from the straight cylinder, and the outer diameter of the auxiliary component gradually increases from the end near the variable diameter cylinder to the end away from the variable diameter cylinder.

[0010] Preferably, the contact surfaces of the seal and the anti-corrosion shell with the sealing layer are roughened.

[0011] Preferably, the top and bottom of the anti-corrosion shell are respectively provided with an air vent and a filling hole, the air vent and the filling hole are respectively arranged adjacent to the two connectors, and the air vent and the filling hole are both located between the two connectors.

[0012] Preferably, both the vent hole and the filling hole are threaded with plugs.

[0013] Preferably, the straight cylinder is fixedly connected to the high-voltage cable by a wound constant force spring.

[0014] Preferably, the sealing layer is a two-component liquid chlorinated polyolefin butyl hydrobaric gel.

[0015] Therefore, the high-voltage cable head sealing device of the present invention, with the above-described structure, has the following beneficial effects:

[0016] 1. The first sealing structure is formed by the sealing layer, and the second sealing structure is formed by the cooperation of the sealing element and the anti-corrosion shell. The double sealing structure can effectively prevent moisture from seeping into the gap between the high-voltage cable and the joint, and the anti-corrosion shell can increase corrosion resistance.

[0017] 2. The structural design of the connector and reducing cylinder ensures the sealing performance of the connection between the seal and the corrosion-resistant outer shell;

[0018] 3. The compression of the spring provides a preload, ensuring a tight fit between the anti-corrosion shell and the seal, further guaranteeing the sealing performance of the connection between the seal and the anti-corrosion shell;

[0019] 4. Utilizing auxiliary components improves the integrity between the sealing layer, sealing components, and anti-corrosion shell, enhancing overall stability and thus helping to maintain overall sealing performance.

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an embodiment of a high-voltage cable head sealing device according to the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of a sealing element in a high-voltage cable head sealing device according to the present invention;

[0023] Figure 3 This is a cross-sectional view of an embodiment of a high-voltage cable head sealing device according to the present invention;

[0024] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0025] In the diagram: 1. Cable connector; 2. High-voltage cable; 3. Seal; 31. Straight cylinder; 32. Reducing cylinder; 4. Corrosion-resistant outer shell; 41. Right cylinder; 42. Left cylinder; 5. Sealing layer; 6. Connector; 7. Raised ring; 8. Annular slot; 9. Spring; 10. Rubber gasket; 11. Auxiliary component; 12. Vent hole; 13. Filling hole; 14. Plug. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Example

[0029] Reference Figures 1-4 As shown, this embodiment provides a high-voltage cable head sealing device, including sealing elements 3 fixedly connected to the outer walls of high-voltage cables 2 on both sides of the cable joint 1. A corrosion-resistant outer shell 4 is sealed between the two sealing elements 3. In this embodiment, the sealing connection is achieved through the tight contact between the sealing elements 3 and the corrosion-resistant outer shell 4. The corrosion-resistant outer shell 4 is filled with a sealing layer 5. The sealing element 3 includes an integrally connected straight cylinder 31 and a reducing cylinder 32. The outer diameter of the reducing cylinder 32 gradually decreases from the end near the cable joint 1 to the end away from the cable joint 1. Connecting heads 6 are provided at both ends of the corrosion-resistant outer shell 4. The inner wall of the connecting head 6 fits against the outer wall of the reducing cylinder 32. The length of the connecting head 6 is less than the length of the reducing cylinder 32.

[0030] In use, the sealing element 3 can be made of silicone rubber, and the anti-corrosion shell 4 can be made of PP. Before connecting the two high-voltage cables 2 to the cable connector 1, the two sealing elements 3 are respectively fitted onto the two high-voltage cables 2, and the anti-corrosion shell 4 is also fitted onto one of the high-voltage cables 2. After the cable connector 1 is connected, the two sealing elements 3 are moved to clamp the anti-corrosion shell 4, and then the two sealing elements 3 are fixed to the two high-voltage cables 2, which also fixes the position of the anti-corrosion shell 4. Then, holes are drilled in the anti-corrosion shell 4, and filler is injected into the cavity formed by the anti-corrosion shell 4, the sealing element 3, the connector 6, and the two high-voltage cables. After standing, a sealing layer 5 is formed. In the above structure, the sealing layer 5 covers the gap between the connector 6 and the two high-voltage cables, forming the first seal. The sealing element 3 and the anti-corrosion shell 4 together form the second seal. The double sealing structure can effectively prevent moisture from seeping into the gap between the high-voltage cable 2 and the connector, and the anti-corrosion shell 4 can increase the corrosion resistance and resistance to external pressure.

[0031] In a further preferred embodiment, the corrosion-resistant outer shell 4 includes a right cylindrical body 41 and a left cylindrical body 42. A protruding ring 7 is provided on the end face of the right cylindrical body 41 near the left cylindrical body 42, and an annular slot 8 is provided on the end face of the left cylindrical body 42 near the right cylindrical body 41. A spring 9 is installed inside the annular slot 8. One end of the spring 9 is fixedly connected to the inner end of the annular slot 8, and the other end of the spring 9 abuts against the protruding ring 7. When the protruding ring 7 is fully inserted into the annular slot 8, the spring 9 is in a compressed state.

[0032] In use, before connecting the two high-voltage cables 2 to the cable connector 1, the right cylinder 41 and the left cylinder 42 are respectively fitted onto the two high-voltage cables 2 and positioned between the two seals 3. After the cable connector 1 is connected to the two high-voltage cables 2, the two seals 3 are moved so that the protruding ring 7 on the right cylinder 41 is fully inserted into the annular slot 8 on the left cylinder 42. At this time, the spring 9 causes the right cylinder 41 and the left cylinder 42 to press the two seals 3 tightly, ensuring the sealing between the seals 3 and the anti-corrosion shell 4.

[0033] In a further optimized design, rubber sealing gaskets 10 are fixedly connected to both the inner and outer curved walls of the convex ring 7.

[0034] When in use, the rubber sealing gasket 10 can improve the sealing performance of the connection between the right cylinder 41 and the left cylinder 42.

[0035] In a further optimized design, a flared auxiliary component 11 is integrally connected to the side of the variable diameter cylinder 32 away from the straight cylinder 31. The outer diameter of the auxiliary component 11 gradually increases from the end near the variable diameter cylinder 32 to the end away from the variable diameter cylinder 32.

[0036] When in use, the auxiliary component 11 can increase the contact area between the seal 3 and the sealing layer 5. The flared design of the two auxiliary components 11 forms an embracing structure in the sealing layer 5, which improves the integrity between the sealing layer 5, the seal 3 and the anti-corrosion shell 4, improves the overall stability, and thus helps to maintain the overall sealing performance.

[0037] In a further optimized design, the contact surfaces of the seal 3 and the anti-corrosion shell 4 with the sealing layer 5 are all roughened.

[0038] When in use, the roughening treatment can increase the mechanical interlocking force between the seal 3, the anti-corrosion shell 4 and the sealing layer 5, further improving the overall stability of the sealing device.

[0039] In a further preferred embodiment, the top and bottom of the anti-corrosion shell 4 are respectively provided with an air vent 12 and a filling hole 13. The air vent 12 and the filling hole 13 are respectively arranged adjacent to the two connectors 6, and both the air vent 12 and the filling hole 13 are located between the two connectors 6.

[0040] In use, the filler that constitutes the sealing layer 5 is injected into the cavity formed by the anti-corrosion shell 4, the seal 3, the connector 6 and the two high-voltage cables through the filling hole 13 at the bottom using a syringe. The filling condition in the cavity is observed through the vent hole 12 to ensure that there are no gaps in the cavity.

[0041] In a further optimized design, both the vent hole 12 and the filling hole 13 are threadedly connected with plugs 14.

[0042] In use, the plug 14 is used to seal the vent 12 and the filling hole 13, thereby protecting the sealing layer 5 and preventing the filling material constituting the sealing layer 5 from being contaminated or deformed by the external environment and leaking out during the standing process.

[0043] In a further optimized design, the straight cylinder 31 is fixedly connected to the high-voltage cable 2 by winding a constant force spring 9.

[0044] When in use, the constant force spring 9 can ensure the stability of the seal 3 on the high voltage cable 2.

[0045] A further optimized solution is proposed that the sealing layer 5 is a two-component liquid chlorinated polyolefin butyl hydrobaric gel.

[0046] When using, mix components A and B of the two-component liquid chlorinated polyolefin butyl water-blocking gel according to the mixing ratio provided by the manufacturer using an AB pneumatic / manual glue gun through the static mixing tube. Slowly fill the cavity formed by the anti-corrosion shell 4, the seal 3, the connector 6, and the two high-voltage cables through the filling hole 13. The two-component liquid chlorinated polyolefin butyl water-blocking gel should be slowly piled up from the bottom and pushed forward to avoid air bubbles. Stop injecting when the gel is level with or enters the vent hole 12. After standing for a period of time to allow the gel to stop flowing, trim any excess gel in the vent hole 12 and the filling hole 13. Then, use the plug 14 to seal the vent hole 12 and the filling hole 13.

[0047] Therefore, the present invention provides a high-voltage cable head sealing device with the above-mentioned structure, which ensures sealing and corrosion resistance through a multi-layer sealing structure.

[0048] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0049] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A high-voltage resistant cable head sealing device, characterized in that: The device includes a sealing element (3) fixedly connected to the outer wall of the high-voltage cable (2) on both sides of the cable joint (1). A corrosion-resistant shell (4) is sealed between the two sealing elements (3). The corrosion-resistant shell (4) is filled with a sealing layer (5). The sealing element (3) includes an integrally connected straight cylinder (31) and a reducing cylinder (32). The outer diameter of the reducing cylinder (32) gradually decreases from the end near the cable joint (1) to the end away from the cable joint (1). The two ends of the corrosion-resistant shell (4) are provided with connectors (6). The inner wall of the connector (6) fits against the outer wall of the reducing cylinder (32). The length of the connector (6) is less than the length of the reducing cylinder (32).

2. The high-voltage cable head sealing device according to claim 1, characterized in that: The anti-corrosion shell (4) includes a right cylinder (41) and a left cylinder (42). The right cylinder (41) has a protruding ring (7) on its end face near the left cylinder (42). The left cylinder (42) has an annular slot (8) on its end face near the right cylinder (41). A spring (9) is provided in the annular slot (8). One end of the spring (9) is fixedly connected to the inner end of the annular slot (8). The other end of the spring (9) abuts against the protruding ring (7). When the protruding ring (7) is fully inserted into the annular slot (8), the spring (9) is in a compressed state.

3. The high-voltage cable head sealing device according to claim 2, characterized in that: Rubber sealing gaskets (10) are fixedly connected to both the inner and outer curved walls of the convex ring (7).

4. The high-voltage cable head sealing device according to claim 1, characterized in that: The variable diameter cylinder (32) is also integrally connected to a horn-shaped auxiliary component (11) on the side away from the straight cylinder (31). The outer diameter of the auxiliary component (11) gradually increases from the end near the variable diameter cylinder (32) to the end away from the variable diameter cylinder (32).

5. The high-voltage cable head sealing device according to claim 1, characterized in that: The contact surfaces of the seal (3) and the anti-corrosion shell (4) with the sealing layer (5) are all roughened.

6. The high-voltage cable head sealing device according to claim 1, characterized in that: The top and bottom of the anti-corrosion shell (4) are respectively provided with an air outlet (12) and a filling hole (13). The air outlet (12) and the filling hole (13) are respectively arranged adjacent to the two connectors (6), and the air outlet (12) and the filling hole (13) are both located between the two connectors (6).

7. The high-voltage cable head sealing device according to claim 6, characterized in that: Both the vent (12) and the filling hole (13) are threaded with plugs (14).

8. The high-voltage cable head sealing device according to claim 1, characterized in that: The straight cylinder (31) is fixedly connected to the high-voltage cable (2) by a wound constant force spring (9).

9. The high-voltage cable head sealing device according to claim 1, characterized in that: The sealing layer (5) is a two-component liquid chlorinated polyolefin butyl hydrobarrier gel.

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