Power cable cold shrinkage accessory

Abstract

The utility model discloses a power cable cold shrinkage accessory, which comprises a cable, a cold shrinkage sleeve body and a wiring terminal, the cold shrinkage sleeve body is fixedly sleeved at the fracture end part of a protective layer of the cable, and the wiring terminal is fixedly arranged at the core wire end of the cable; the cold shrinkage sleeve body is composed of a cold shrinkage layer, a colloid layer, a film coating layer and a supporting core, and the inner portion of the cold shrinkage layer wraps the outer wall of the colloid layer. According to the utility model, the inner wall of the cold contraction layer is coated with the colloid layer, the film coating layer is fixed on the outer surface of the supporting core, the film coating layer is tightly attached to the colloid layer, when the supporting core is torn down, the supporting core is torn down and the film coating layer is taken down, the cold contraction layer loses the support of the supporting core, and the cold contraction layer is elastically wrapped on the cable, so that the cold contraction layer is better wrapped on the cable; the colloid layer can effectively seal the cable coating; the wire breaking groove is formed in the supporting core, the discontinuous groove is formed in the middle of the wire breaking groove, the supporting core can be torn down conveniently, the supporting groove is formed in the wire breaking groove, and winding drum radial supporting of the supporting core can be enhanced conveniently.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable cold shrink accessory technical field especially relates to a kind of power cable cold shrink accessories. BACKGROUND

[0002] Power cable cold shrink accessories play a crucial role in power transmission systems, as they are mainly used for connecting, terminal processing or branching cables to ensure the safety and reliability of power transmission. However, despite the existing power cable cold shrink accessories have met the needs of the industry to some extent, there are still obvious shortcomings in sealing performance and support effect of support core, which directly affect the long-term stable operation and maintenance cost of cable system.

[0003] Poor sealing performance is the most prominent problem of existing power cable cold shrink accessories. Good sealing not only prevents moisture and other corrosive substances from entering the cable joint area, but also effectively isolates the influence of external environment, protecting the internal conductor from damage. However, many traditional cold shrink accessories use sealing materials and techniques that cannot achieve optimal sealing effect. Especially in extreme weather conditions, such as high temperature, low temperature or high humidity environment, these accessories are prone to aging, hardening and even cracking, leading to sealing failure. Once this happens, not only will it reduce the overall performance of the power system, but in severe cases it may also cause short circuit failure, causing huge losses to the power grid.

[0004] The design of support core is also a major shortcoming of current power cable cold shrink accessories. The main function of support core is to maintain the shape of cold shrink sleeve during installation until it is fully shrunk and tightly attached to the cable surface. An ideal support core should have enough strength to resist external forces, while being easy to remove without damaging the cable or the accessory itself. However, in actual application, the support core of many cold shrink accessories is either too hard, making removal difficult, or insufficient in strength, easily deformed or even broken during operation, affecting installation quality and subsequent use effect. In addition, the matching degree between some support cores and cold shrink sleeves is not high, resulting in gaps between them, reducing the sealing performance and mechanical stability.

[0005] With the development of power systems towards higher voltage levels, the requirements for cable accessories are also increasing. Some existing cold shrink accessories may not be able to adapt well to this change, especially in high-voltage or even super-high-voltage cable applications, they may not be able to provide sufficient electrical insulation strength, increasing the safety hazard. At the same time, with the increasing trend of underground arrangement of power facilities, the requirements for corrosion resistance, mechanical stress resistance and other aspects are also increasing, while the performance of some existing cold shrink accessories in these aspects still needs to be strengthened.

[0006] Therefore, how to provide a power cable cold shrinkage accessory is a problem that those skilled in the art urgently need to solve. Utility model content

[0007] One purpose of the utility model lies in providing a power cable cold shrinkage accessory, the utility model discloses a colloid layer is coated on the inner wall of the cold shrinkage layer, the film coating layer is fixed on the outer surface of the support core, the film coating layer is tightly attached to the colloid layer, the support core is torn off and takes the film coating layer down, the cold shrinkage layer loses the support of the support core, the cold shrinkage layer is elastically wrapped on the cable, the colloid layer better plays effective sealing to cable wrapping, a broken wire groove is arranged on the support core, an intermittent groove is arranged in the middle of the broken wire groove, the support core is conveniently torn off, and a support groove is arranged in the broken wire groove, so that the radial support of the winding drum of the support core is conveniently enhanced.

[0008] According to the power cable cold shrinkage accessory provided by the utility model embodiment, the cold shrinkage sleeve body is fixedly sleeved at the protective layer break end of the cable, and the wiring terminal is fixedly installed at the core wire end of the cable.

[0009] The cold shrinkage sleeve body is composed of a cold shrinkage layer, a colloid layer, a film coating layer and a support core, the inside of the cold shrinkage layer is wrapped on the outer wall of the colloid layer, the inside of the colloid layer is wrapped on the outer wall of the film coating layer, and the inside of the film coating layer is wrapped on the outer wall of the support core.

[0010] Further, the cold shrinkage sleeve body comprises a three-finger sleeve, a cold shrinkage straight pipe, a cold shrinkage terminal and a sealing pipe, wherein the three-finger sleeve is fixedly sleeved at the end of the cable, the cold shrinkage straight pipe is fixedly sleeved at the core wire end of the cable, the cold shrinkage terminal is fixedly sleeved at the core wire end of the cable, one end of the sealing pipe is fixedly sleeved at the core wire end of the cable, and the other end of the sealing pipe is fixedly sleeved at the end of the wiring terminal.

[0011] Further, the outer surface of the cold shrinkage terminal is fixedly provided with a first rain cap, and the outer surface of the cold shrinkage terminal is fixedly provided with a second rain cap.

[0012] Further, the first rain cap is provided with three, the second rain cap is provided with two, and the second rain cap is arranged at the middle position between every two first rain caps.

[0013] Further, the broken wire groove is provided with an intermittent groove in the inside.

[0014] Further, the inclination angle of the broken wire groove is 15°.

[0015] Further, the intermittent groove is provided with a plurality of intermittent grooves, and the spiral interval length of the plurality of intermittent grooves is 15 cm.

[0016] Further, the inside of the broken line groove is provided with support grooves, and the support grooves are three, and the three support grooves are located on the broken line groove between two broken grooves.

[0017] The utility model discloses the beneficial effect is:

[0018] The utility model discloses a cold shrink layer, the outer surface of support core is fixed with the film layer of adhesive layer, and the film layer is closely attached to the adhesive layer, and the support core is torn down and takes the film layer down, and the cold shrink layer loses the support of support core, and the cold shrink layer is elastically wrapped on the cable, better let the cold shrink layer be wrapped on the cable, and the adhesive layer better plays effective sealing to cable coating, the broken line groove is arranged on the support core, the middle of the broken line groove is provided with the broken groove, the support groove is arranged in the broken line groove, and the support core is torn down conveniently, and the radial support of the winding drum of support core is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings are used to provide further understanding of the utility model and constitute part of the specification, and are used together with the embodiments of the utility model to explain the utility model, and do not constitute the limitation of the utility model.

[0020] Fig. 1 The utility model discloses a kind of overall structure schematic diagram of power cable cold shrink accessory;

[0021] Fig. 2 The utility model discloses a kind of cross-sectional view of power cable cold shrink accessory's cold shrink sleeve body;

[0022] Fig. 3 A kind of power cable cold shrink accessory's cold shrink sleeve body is unfolded plan view for the utility model proposes.

[0023] In the drawing: 1, cable;2, cold shrink sleeve;2.1, cold shrink layer;2.2, adhesive layer;2.3, film layer;2.4, support core;2.4.1, broken line groove;2.4.2, broken groove;2.4.3, support groove;3, terminal;4, three finger sleeve;5, cold shrink straight pipe;6, cold shrink terminal;6.1, first rain cap;6.2, second rain cap;7, sealing tube. DETAILED DESCRIPTION

[0024] Now further detailed description of the utility model is combined with the drawings. These drawings are all simplified schematic diagram, and only with schematic way to illustrate the basic structure of the utility model, so it only shows the structure related to the utility model.

[0025] Power cable cold shrink accessories play a crucial role in power transmission systems, mainly used for connecting, terminating or branching cables, ensuring the safety and reliability of power transmission; however, although existing power cable cold shrink accessories have met the needs of the industry to some extent, there are still obvious shortcomings in sealing performance and support effect of the support core, which directly affect the long-term stable operation of the cable system and maintenance cost.

[0026] Poor sealing performance is the most prominent problem of existing power cable cold shrink accessories; good sealing not only prevents moisture and other corrosive substances from entering the cable joint area, but also effectively isolates the influence of the external environment, protecting the internal conductor from damage; however, the sealing materials and techniques used by many traditional cold shrink accessories cannot achieve the best sealing effect; especially in extreme weather conditions, such as high temperature, low temperature or high humidity environment, these accessories are prone to aging, hardening and even cracking, leading to sealing failure; once this happens, not only will it reduce the overall performance of the power system, but in severe cases it may also cause short circuit failure, causing huge losses to the power grid.

[0027] The design of the support core is also a major shortcoming of current power cable cold shrink accessories; the main function of the support core is to maintain the shape of the cold shrink sleeve during installation until it is fully shrunk and tightly attached to the cable surface. The ideal support core should have sufficient strength to resist external forces, while being easy to remove without damaging the cable or the accessory itself; but in actual application, the support core of many cold shrink accessories is either too hard, making removal difficult; or insufficient strength, easily deformed or even broken during operation, affecting installation quality and subsequent use effect; in addition, the matching degree between some support cores and cold shrink sleeves is not high, resulting in gaps between them, reducing the sealing performance and mechanical stability.

[0028] With the development of power systems towards higher voltage levels, the requirements for cable accessories are also increasing; some existing cold shrink accessories may not be able to adapt well to this change, especially in high voltage or even super high voltage cable applications, they may not provide sufficient electrical insulation strength, increasing the safety hazard; at the same time, with the increasing trend of underground arrangement of power facilities, the requirements for corrosion resistance, mechanical stress resistance and other aspects are also increasing, while the performance of some existing cold shrink accessories in these aspects still needs to be strengthened.

[0029] To solve the above problems, the following technical solutions are proposed:

[0030] Please refer to Figs. 1 to 3The utility model provides a kind of power cable cold shrink accessory, including cable 1, cold shrink sleeve 2 and terminal 3, cold shrink sleeve 2 is fixedly sleeved in the protective layer fracture end of cable 1, terminal 3 is fixedly installed in the core wire end of cable 1;Cold shrink sleeve 2 is composed of cold shrink layer 2.1, colloid layer 2.2, film coating layer 2.3 and support core 2.4, the inside of cold shrink layer 2.1 is coated on the outer wall of colloid layer 2.2, the inside of colloid layer 2.2 is coated on the outer wall of film coating layer 2.3, the inside of film coating layer 2.3 is coated on the outer wall of support core 2.4.

[0031] Specifically, cold shrink sleeve 2 includes three-finger sleeve 4, cold shrink straight pipe 5, cold shrink terminal 6 and sealing pipe 7, wherein three-finger sleeve 4 is fixedly sleeved in the end of cable 1, cold shrink straight pipe 5 is fixedly sleeved in the core wire end of cable 1, cold shrink terminal 6 is fixedly sleeved in the core wire end of cable 1, one end of sealing pipe 7 is fixedly sleeved in the core wire end of cable 1, the other end of sealing pipe 7 is fixedly sleeved in the end of terminal 3, the outer surface of cold shrink terminal 6 is fixedly provided with first rain cap 6.1, the outer surface of cold shrink terminal 6 is fixedly provided with second rain cap 6.2, first rain cap 6.1 is provided with three, second rain cap 6.2 is provided with two, second rain cap 6.2 is located in the middle position between every two first rain caps 6.1.

[0032] More specifically, the inner and outer sides of support core 2.4 are provided with wire breaking groove 2.4.1, the helical upward inclination angle of wire breaking groove 2.4.1 is 15°, the inside of wire breaking groove 2.4.1 is provided with intermittent groove 2.4.2, intermittent groove 2.4.2 is provided with multiple, the helical interval length of multiple intermittent grooves 2.4.2 is 15cm, the inside of wire breaking groove 2.4.1 is provided with support groove 2.4.3, support groove 2.4.3 is provided with three, three support grooves 2.4.3 are located on wire breaking groove 2.4.1 between every two intermittent grooves 2.4.2.

[0033] Further, by coating colloid layer 2.2 on the inner wall of cold shrink layer 2.1, film coating layer 2.3 is fixed on the outer surface of support core 2.4, film coating layer 2.3 is tightly attached to colloid layer 2.2, by pulling out support core 2.4, support core 2.4 is torn off and film coating layer 2.3 is taken off, cold shrink layer 2.1 loses the support of support core 2.4, cold shrink layer 2.1 is elastically wrapped on cable 1, better allowing cold shrink layer 2.1 to be wrapped on cable 1, colloid layer 2.2 better effectively seals cable 1.

[0034] Wire breaking groove 2.4.1 is provided on support core 2.4, intermittent groove 2.4.2 is provided in the middle of wire breaking groove 2.4.1, which facilitates the tearing of support core 2.4, support groove 2.4.3 is provided in wire breaking groove 2.4.1, which facilitates the radial support of support core 2.4.

[0035] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An electric power cable cold shrink accessory characterized in that, It includes a cable (1), a cold shrink sleeve (2) and a terminal (3), the cold shrink sleeve (2) is fixedly sleeved at the protective layer fracture end of the cable (1), and the terminal (3) is fixedly installed at the core wire end of the cable (1); The cold shrink sleeve (2) is composed of a cold shrink layer (2.1), a glue layer (2.2), a film layer (2.3) and a support core (2.4), the inside of the cold shrink layer (2.1) is wrapped on the outer wall of the glue layer (2.2), the inside of the glue layer (2.2) is wrapped on the outer wall of the film layer (2.3), and the inside of the film layer (2.3) is wrapped on the outer wall of the support core (2.4).

2. An electric power cable cold shrink accessory according to claim 1, characterised in that, The cold shrink sleeve (2) includes a three-finger sleeve (4), a cold shrink straight pipe (5), a cold shrink terminal (6) and a sealing pipe (7), wherein the three-finger sleeve (4) is fixedly sleeved at the end of the cable (1), the cold shrink straight pipe (5) is fixedly sleeved at the core wire end of the cable (1), the cold shrink terminal (6) is fixedly sleeved at the core wire end of the cable (1), one end of the sealing pipe (7) is fixedly sleeved at the core wire end of the cable (1), and the other end of the sealing pipe (7) is fixedly sleeved at the end of the terminal (3).

3. An electric power cable cold shrink accessory according to claim 2, characterised in that, The outer surface of the cold shrink terminal (6) is fixedly provided with a first rain cap (6.1), and the outer surface of the cold shrink terminal (6) is fixedly provided with a second rain cap (6.2).

4. An electric power cable cold shrink accessory according to claim 3, characterised in that, The first rain cap (6.1) is provided with three, and the second rain cap (6.2) is provided with two, and the second rain cap (6.2) is arranged at the middle position between the two first rain caps (6.1).

5. An electric power cable cold shrink accessory according to claim 1, characterised in that, The inside and outside of the support core (2.4) are provided with a broken line groove (2.4.1).

6. An electric power cable cold shrink accessory according to claim 5, characterised in that, The broken line groove (2.4.1) is spirally inclined upward at an angle of 15°.

7. An electric power cable cold shrink accessory according to claim 6, characterised in that, The inside of the broken line groove (2.4.1) is provided with an intermittent groove (2.4.2), the intermittent groove (2.4.2) is provided with a plurality of intermittent grooves (2.4.2), and the spiral interval length of the plurality of intermittent grooves (2.4.2) is 15cm.

8. An electric power cable cold shrink accessory according to claim 7, characterised in that, The inside of the broken line groove (2.4.1) is provided with a support groove (2.4.3), the support groove (2.4.3) is provided with three, and the three support grooves (2.4.3) are arranged on the broken line groove (2.4.1) between the two intermittent grooves (2.4.2).

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