High-voltage rubber shielding tube for 110kV and above intermediate joint

Abstract

The utility model discloses a high-voltage rubber shielding tube for an intermediate joint of 110kV and above, which comprises an insulating rubber tube body, a mounting ring groove is arranged in the insulating rubber tube body, a semi-conductive inner shielding layer is arranged in the mounting ring groove, the middle of the semi-conductive inner shielding layer is of a cylindrical structure, and the middle of the semi-conductive inner shielding layer is of a cylindrical structure. The two ends of the semi-conductive inner shielding layer are conical ring structures of which the diameters are gradually increased from one end close to the cylindrical structure to the other end far away from the cylindrical structure; the semi-conductive inner shielding layer is arranged to be of a middle cylindrical structure, the two ends of the semi-conductive inner shielding layer are of a conical ring structure with the diameter gradually increasing from the end close to the cylindrical structure to the end away from the cylindrical structure, the whole semi-conductive inner shielding layer is of a dumbbell-shaped structure, and the electric field intensity of the semi-conductive outer shielding pipe can be reduced; and the shielding effect of the semi-conductive inner shielding layer on the electric field is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cable accessories, and specifically relates to a high-voltage rubber shielding tube for a 110 kV and above intermediate joint. Background Art

[0002] As is well known, cable accessories are products that connect cables to power transmission and distribution lines and related power distribution devices. Generally, they refer to the intermediate connections and terminal connections of various cables in a cable line. With the growth of people's demand for electricity, the application of cable joints is becoming more and more extensive, and a good connection method is required to ensure the normal operation of the cables. An intermediate joint is a joint for connecting cables. When an intermediate joint connects cables, a shielding tube needs to be arranged inside it so that a semi-conductive shielding layer is formed in the intermediate joint. The semi-conductive shielding layer is to evenly distribute the electric field on the outer surface of the core and avoid partial discharge between the conductor and the insulation caused by the uneven surface of the conductor and the air gaps generated by the stranding of the core.

[0003] For example, in the patent with the publication number CN218828250U, the publication date of April 7, 2023, and the name "A Cable Shielding Device for a Fast Charging Device", this patent provides a cable shielding device for a fast charging device, which relates to the technical field of charging cables. The cable shielding device for a fast charging device includes: a cable and a shielding component. The cable includes an outer protection tube. The shielding component includes an outer shielding tube sleeved on the inner wall of the outer protection tube. A power supply wire is installed inside the outer shielding tube. An inner shielding tube is sleeved outside the power supply wire. A shielding ring is installed at one end of the outer protection tube. A plug is installed on the side of the shielding ring away from the outer protection tube. The shielding plate can separate multiple power supply wires. Cooperating with the inner shielding tube can avoid the electromagnetic interaction of multiple power supply wires with each other. At the same time, the shielding ring enhances the shielding effect at the connection between the cable and the plug. The outer shielding tube can shield the influence of external electromagnetic fields on the cable. By setting multiple shielding layers, the shielding effect of the cable shielding device is ensured.

[0004] In the prior art, the inside of the semi-conductive inner shielding layer is of a circular straight tube structure. When an intermediate joint connects cables, the electric field intensity of the semi-conductive outer shielding tube is relatively large, which will affect the shielding effect of the inner shielding tube on the electric field. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a high-voltage rubber shielding tube for a 110 kV and above intermediate joint to solve the above problems in the prior art.

[0006] To achieve the above object, the present utility model provides the following technical solution: A high-voltage rubber shielding tube for a 110 kV and above intermediate joint, comprising an insulating rubber tube body, an installation ring groove is arranged inside the insulating rubber tube body, a semi-conductive inner shielding layer is arranged in the installation ring groove, the middle of the semi-conductive inner shielding layer is in a cylindrical structure, and both ends of the semi-conductive inner shielding layer are in tapered ring structures with diameters gradually increasing from one end close to the cylindrical structure to the end far from the cylindrical structure.

[0007] As described above, the installation ring groove and the outer shape of the semi-conductive inner shielding layer are mutually adapted.

[0008] As described above, a semi-conductive outer shielding layer is arranged on the outer wall of the insulating rubber tube body.

[0009] As described above, two semi-conductive stress cone bodies are symmetrically arranged at both ends of the insulating rubber tube body.

[0010] As described above, the radii of the two semi-conductive stress cone bodies gradually increase from the end far from the semi-conductive inner shielding layer to the end close to the semi-conductive inner shielding layer.

[0011] As described above, two cone supports are symmetrically arranged at both ends of the insulating rubber tube body.

[0012] As described above, the two cone supports are respectively in mutual abutment with the two semi-conductive stress cone bodies.

[0013] As described above, two connection grooves are symmetrically opened at both ends of the insulating rubber tube body.

[0014] As described above, each of the two cone supports is provided with a connecting rod.

[0015] As described above, each connecting rod is connected and matched with its corresponding connection groove.

[0016] The beneficial effect of the present utility model is that the semi-conductive inner shielding layer is set as a middle cylindrical structure, and both ends of the semi-conductive inner shielding layer are in tapered ring structures with diameters gradually increasing from one end close to the cylindrical structure to the end far from the cylindrical structure. The semi-conductive inner shielding layer as a whole is in a "dumbbell" structure, which can reduce the electric field strength of the semi-conductive outer shielding tube and improve the shielding effect of the semi-conductive inner shielding layer on the electric field. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0018] Figure 1Partial sectional structure schematic diagram of an embodiment provided by the present utility model;

[0019] Figure 2 Partial sectional structure schematic diagram of a shielding tube of the prior art of the present utility model;

[0020] Figure 3 Partial sectional structure schematic diagram of another embodiment provided by the present utility model;

[0021] Figure 4 Partial sectional structure schematic diagram of still another embodiment provided by the present utility model.

[0022] Description of reference numerals:

[0023] 1. Insulating rubber tube body; 2. Installation ring groove; 3. Semi-conductive inner shielding layer; 31. Cylindrical structure; 32. Conical ring structure; 4. Semi-conductive outer shielding layer; 5. Semi-conductive stress cone body; 6. Cone support; 7. Connection groove; 8. Connecting rod; 9. Auxiliary groove; 10. Arc surface groove; 11. Insert rod; 12. Groove; 13. Tightening rod; 14. Elastic member; 15. Positioning bead. Specific implementation manners

[0024] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the present utility model will be further introduced in detail below with reference to the accompanying drawings.

[0025] As Figures 1 to 4 shown, a high-voltage rubber shielding tube for a 110 kV and above intermediate joint provided by an embodiment of the present utility model includes an insulating rubber tube body 1. An installation ring groove 2 is provided inside the insulating rubber tube body 1. A semi-conductive inner shielding layer 3 is provided inside the installation ring groove 2. The middle of the semi-conductive inner shielding layer 3 is a cylindrical structure 31, and both ends of the semi-conductive inner shielding layer 3 are conical ring structures 32 with diameters gradually increasing from one end close to the cylindrical structure 31 to the end far from the cylindrical structure 31.

[0026] Specifically, the high-voltage rubber shielding tube is arranged inside the rubber group of the intermediate joint. The insulating rubber tube body 1 is made of rubber material. A semi-conductive outer shielding layer 4 is arranged on the outer wall of the insulating rubber tube body 1. The semi-conductive inner shielding layer 3 can eliminate the air gap on the surface of the conductive wire core and improve the ability to resist partial discharge and tree discharge. The two ends of the semi-conductive inner shielding layer 3 are tapered ring structures 32 with a gradually increasing diameter from the end close to the cylindrical structure 31 to the end far from the cylindrical structure 31. The semi-conductive inner shielding layer 3 is in a "dumbbell" shape. The installation ring groove 2 is adapted to the outer shape of the semi-conductive inner shielding layer 3. Since the middle part of the existing semi-conductive inner shielding layer 3 is a circular straight cylinder structure, the electric field intensity of the semi-conductive outer shielding tube is relatively large, reducing the shielding effect of the semi-conductive inner shielding layer 3. By setting the semi-conductive inner shielding layer 3 in a "dumbbell" shape, the electric field intensity of the semi-conductive outer shielding tube can be reduced, and the shielding effect of the semi-conductive inner shielding layer 3 on the electric field can be improved.

[0027] In the prior art, the inner part of the semi-conductive inner shielding layer 3 is a circular straight cylinder structure. When the intermediate joint connects the cable, the electric field intensity of the semi-conductive outer shielding tube is relatively large, which will affect the shielding effect of the inner shielding tube on the electric field.

[0028] The beneficial effect of the present utility model is that the semi-conductive inner shielding layer 3 is set as a middle cylindrical structure 31. The two ends of the semi-conductive inner shielding layer 3 are tapered ring structures 32 with a gradually increasing diameter from the end close to the cylindrical structure 31 to the end far from the cylindrical structure 31. The semi-conductive inner shielding layer 3 as a whole is in a "dumbbell" shape, which can reduce the electric field intensity of the semi-conductive outer shielding tube and improve the shielding effect of the semi-conductive inner shielding layer 3 on the electric field.

[0029] Furthermore, two semi-conductive stress cone bodies 5 are symmetrically arranged at both ends of the insulating rubber tube body 1; the two semi-conductive stress cone bodies 5 gradually increase in radius from the end far from the semi-conductive inner shielding layer 3 to the end close to the semi-conductive inner shielding layer 3. Specifically, the semi-conductive stress cone body 5 gradually increases in radius from the end far from the semi-conductive inner shielding layer 3 to the end close to the semi-conductive inner shielding layer 3. The semi-conductive stress cone body 5 is a tapered cylinder structure 31. By changing the geometric shape of the electric field concentration area at the position of the insulating rubber tube body 1 through the semi-conductive stress cone body 5, the electric field stress concentration is relieved, and the electric field at the position of the insulating rubber tube body 1 is guided through the semi-conductive stress cone body 5, reducing the electric field at the position of the semi-conductive inner shielding layer 3 and improving the shielding effect of the semi-conductive inner shielding layer 3 on the electric field.

[0030] In another embodiment provided by the present utility model, two cone supports 6 are symmetrically arranged at both ends of the insulating rubber tube body 1; the two cone supports 6 are respectively in abutting connection with the two semi-conductive stress cone bodies 5; two connection grooves 7 are symmetrically formed at both ends of the insulating rubber tube body 1, that is, two connection grooves 7 are symmetrically arranged at one end of the insulating rubber tube body 1, and a total of four connection grooves 7 are arranged at both ends of the insulating rubber tube body 1; two connecting rods 8 are symmetrically arranged on each of the two cone supports 6, that is, each cone support 6 is symmetrically provided with two connecting rods 8, and a total of four connecting rods 8 are arranged on the two cone supports 6; each of the connecting rods 8 is connected and matched with its corresponding connection groove 7.

[0031] Specifically, the cone support 6 is in abutting connection with the semi-conductive stress cone body 5, and the connecting rod 8 and the connection groove 7 are arranged in an inserted and positioned manner, so that the connecting rod 8 can connect the cone support 6 to the insulating rubber tube body 1, and the cone support 6 abuts and supports the semi-conductive stress cone body 5 to prevent the semi-conductive stress cone body 5 from displacing in the insulating rubber tube body 1, thereby affecting the guiding effect of the semi-conductive stress cone body 5 on the electric field of the position of the insulating rubber tube body 1. The connection groove 7 is preferably a threaded groove, the connecting rod 8 is preferably a threaded rod, the connecting rod 8 is made of rubber material, the connecting rod 8 is rotatably arranged on the cone support 6, by aligning the connecting rod 8 with the connection groove 7, the staff uses a tool to screw the threaded rod, through the threaded connection between the threaded rod and the threaded groove, the threaded rod fixedly connects the cone support 6 to the insulating rubber tube body 1, so that the cone support 6 can be connected to the insulating rubber tube body 1, and the cone support 6 abuts and supports the semi-conductive stress cone body 5 to prevent the semi-conductive stress cone body 5 from displacing in the insulating rubber tube body 1, improving the installation stability of the cone support 6.

[0032] In still another embodiment provided by the present utility model, two cone supports 6 are symmetrically arranged at both ends of the insulating rubber tube body 1, and two auxiliary grooves 9 are symmetrically formed at both ends of the insulating rubber tube body 1, that is, two auxiliary grooves 9 are symmetrically arranged at one end of the insulating rubber tube body 1, and a total of four auxiliary grooves 9 are arranged at both ends of the insulating rubber tube body 1. Two arc-shaped grooves 10 are symmetrically arranged on the inner walls of each of the auxiliary grooves 9, that is, each auxiliary groove 9 is symmetrically provided with two arc-shaped grooves 10, and a total of eight arc-shaped grooves 10 are arranged in the four auxiliary grooves 9. Two insertion rods 11 are symmetrically arranged on each of the two cone supports 6, that is, each cone support 6 is symmetrically provided with two insertion rods 11, and a total of four insertion rods 11 are arranged on the two cone supports 6. Two grooves 12 are symmetrically arranged on each of the insertion rods 11, and a total of eight grooves 12 are arranged on the four insertion rods 11. A pressing rod 13 is slidably installed in each of the grooves 12, and each of the pressing rods 13 is connected to the inner wall of its corresponding groove 12 through an elastic member 14, and a positioning bead 15 is rotatably arranged on each of the pressing rods 13.

[0033] Specifically, when the cone support 6 needs to be connected to the insulating rubber tube body 1, the staff presses the cone support 6 against the insulating rubber tube body 1, aligns the insertion rod 11 with the auxiliary groove 9, and pushes the cone support 6 and the insertion rod 11 into the auxiliary groove 9. The positioning bead 15 is driven by the extrusion of the inner wall of the auxiliary groove 9 to drive the abutting rod 13 to slide towards one end inside the groove 12, so that the abutting rod 13 squeezes the elastic member 14 (the elastic member 14 is a member capable of telescopic reset, preferably a spring), making the elastic member 14 in a compressed state. When the positioning bead 15 rolls to the position of the arc surface groove 10, the positioning bead 15 abuts against the inner wall of the arc surface groove 10. Under the rebounding action of the elastic member 14, the elastic member 14 drives the abutting rod 13 and the positioning bead 15 to abut against the arc surface groove 10, so that the abutting rod 13 and the positioning bead 15 position the insertion rod 11 in the auxiliary groove 9, making the cone support 6 stably connected to the insulating rubber tube body 1, enabling the cone support 6 to support and abut against the semi-conductive stress cone body 5, preventing the semi-conductive stress cone body 5 from displacing inside the insulating rubber tube body 1, and improving the stability of the installation of the cone support 6.

[0034] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high-voltage rubber shielding tube for 110 kV and above intermediate joints, comprising an insulating rubber tube body, characterized in that, An installation ring groove is arranged inside the insulating rubber tube body. A semi-conductive inner shielding layer is arranged in the installation ring groove. The middle of the semi-conductive inner shielding layer is in a cylindrical structure, and both ends of the semi-conductive inner shielding layer are in conical ring structures with a gradually increasing diameter from one end close to the cylindrical structure to the end far away from the cylindrical structure.

2. The high-voltage rubber shielding tube for 110 kV and above intermediate joints according to claim 1, wherein The installation ring groove and the outer shape of the semi-conductive inner shielding layer are mutually adapted.

3. The high-voltage rubber shielding tube for 110 kV and above intermediate joints according to claim 1, wherein, A semi-conductive outer shielding layer is arranged on the outer wall of the insulating rubber tube body.

4. The high-voltage rubber shielding tube for 110 kV and above intermediate joints according to claim 1, characterized in that, Two semi-conductive stress cone bodies are symmetrically arranged at both ends of the insulating rubber tube body.

5. The high-voltage rubber shielding tube for the 110 kV and above intermediate joint according to claim 4, characterized in that, The radii of the two semi-conductive stress cone bodies gradually increase from the end far away from the semi-conductive inner shielding layer to the end close to the semi-conductive inner shielding layer.

6. The high-voltage rubber shielding tube for 110 kV and above intermediate joints according to claim 4, characterized in that, Two cone supports are symmetrically arranged at both ends of the insulating rubber tube body.

7. The high-voltage rubber shielding tube for 110 kV and above intermediate joints according to claim 6, characterized in that, The two cone supports are respectively in mutual abutment with the two semi-conductive stress cone bodies.

8. The high-voltage rubber shielding tube for 110 kV and above intermediate joints according to claim 6, characterized in that, Two connection grooves are symmetrically formed at both ends of the insulating rubber tube body.

9. The high-voltage rubber shielding tube for 110 kV and above intermediate joints according to claim 8, characterized in that, Each of the two cone supports is provided with a connecting rod.

10. A high-voltage rubber shielding tube for 110 kV and above intermediate joints according to claim 9, characterized in that, Each connecting rod is connected and matched with its corresponding connection groove.

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