CN107769147B - 35kv cold-shrink joint - Google Patents

Abstract

The invention discloses a 35kv cold-shrink joint which comprises a connecting pipe, a semi-conducting belt, an insulating body, a cold-shrink intermediate joint pipe, a semi-conducting layer, a constant force spring, a copper shielding layer, a cable inner sheath, an inner protective layer, a copper braided wire, an armor layer, an outer protective layer and a cable outer sheath, wherein the insulating body is formed by injection vulcanization of silicon rubber in a factory, each part of the cold-shrink joint is formed by injection vulcanization of the same material as the insulating body, and is further formed into various cable accessories by expanding and lining with a plastic support, wherein the connecting pipe is used for connecting two cable conductors, and the insulating body is extruded and wrapped on each cable conductor and positioned on two sides of the connecting pipe and the semi-conducting belt. Has the advantages that: the invention has the characteristics of small volume, light weight, safety, reliability, convenient installation and the like, and the stability among the accessories of the cable is kept while the installation is convenient.

Description

A 35kv cold shrink joint

technical field

The invention relates to the field of power cable joints, in particular to a 35kv cold shrink joint.

Background technique

Cold-shrinkable cable accessories are components that use elastomer materials (commonly used silicone rubber and ethylene-propylene rubber) to be injected and vulcanized in the factory, and then expanded and lined with plastic spiral supports to form various cable accessories. During field installation, these pre-expanded parts are put on the end or joint of the treated cable, the plastic spiral strip (support) of the inner support is pulled out, and the cable accessories are formed by pressing on the cable insulation. Because it relies on elastic retraction force at room temperature, rather than heat shrinkable cable accessories that need to be heated and shrinked by fire, it is commonly known as cold shrinkable cable accessories.

At present, the conductor connection treatment of the intermediate joint on the market is to use the conductor connection tube to crimp the two separated cable conductors together. Uneven, when the support strip is pulled, the support strip and the semi-conductive tape will rub the semi-conductive tape into the insulating layer, which will cause the product to break down during operation. Conductive tapes may unravel during installation and bring into the insulating layer causing product quality failures.

For the problems in the related technologies, no effective solutions have been proposed so far.

SUMMARY OF THE INVENTION

In view of the problems in the related art, the present invention proposes a 35kv cold shrink joint to overcome the above technical problems existing in the related art.

The technical scheme of the present invention is realized as follows:

A 35kv cold shrink joint, the cold shrink joint includes a connecting pipe, a semi-conductive tape, an insulating body, a cold shrink intermediate joint pipe, a semi-conductive layer, a constant force spring, a copper shielding layer, an inner cable sheath, an inner protective layer, copper Braided wire, armor layer, outer protective layer and cable outer sheath, the insulating body is injection vulcanized in the factory using silicone rubber, and the components of the cold shrink joint are injection vulcanized using the same material as the insulating body Formed, expanded, lined with plastic supports to form parts of various cable accessories, wherein the connecting tube is used to connect two cable conductors, each cable conductor is located on the connecting tube and the semiconducting tape. An insulating body is extruded on both sides of the connecting pipe, the semiconducting tape is wound and connected with the connecting pipe and is flush with the outer diameter of the insulating body on one side of the connecting pipe, and the cold shrinkable intermediate joint pipe is arranged on the connecting pipe. The connecting tube, the semi-conductive tape and the outer layer of the insulating body form a cable accessory with an integral structure, the semi-conductive layer is arranged on the outer surface of the cold-shrink intermediate joint tube, and the constant force spring is arranged near the A copper shielding layer is located on the outer surface of the cold-shrinkable intermediate joint tube, the copper shielding layer is arranged on the periphery of the cable conductor and is located on one side of the cold-shrinkable intermediate joint tube, and the copper braided wire is wound around the cold-shrinkable intermediate joint tube. The outer part of the surface of the shrink intermediate joint pipe, the outer periphery of the cold shrink intermediate joint pipe is provided with an inner protective layer of an integral structure, the outer periphery of the inner protective layer is provided with an armor layer of an integral structure, and the outer periphery of the armor layer is provided An outer protective layer with an integral structure is provided, and the cable outer sheaths are respectively sleeved on the inner sides of both ends of the outer protective layer;

The cold-shrinkable intermediate joint pipe includes an inner layer and an outer layer, the inner wall of the cold-shrinkable intermediate joint pipe is provided with a cavity between the inner layer and the outer layer, and the inner layer and the inner layer of the outer layer are provided with a cavity. A number of first guide rail cavities and second guide rail cavities are respectively arranged correspondingly, the interior of the first guide rail cavity and the second guide rail cavity are respectively provided with a first lining layer and a second lining layer, and the plastic support is a hollow cylindrical shape And matching with the cavity, the inner surface and the outer surface of the plastic support are respectively provided with a first guide rail and a second guide rail corresponding to the first guide rail cavity and the second guide rail cavity.

Further, the silicone rubber used in the cold shrinkable joint is flame-retardant room temperature vulcanized foam silicone rubber DC3-6548.

Further, a plurality of the first guide cavities are evenly distributed along the circumference of the inner layer, and a plurality of the second guide cavities are evenly distributed along the circumference of the outer layer.

Further, the cross section of the first guide rail cavity is an inverted T shape, the cross section of the second guide rail cavity is a T shape, and the first lining layer and the second lining layer are respectively connected with the first guide rail cavity and the second guide rail cavity. Bond between rail cavities.

Further, one end of the inner layer and the outer layer close to the connecting pipe is closed and connected, and the other end of the inner layer and the outer layer is provided with an opening corresponding to the plastic support.

Further, the cold shrinkable joint further comprises a PVC tape arranged on the inner side of the inner protective layer and a waterproof tape on the outer side.

The beneficial effects of the present invention are as follows: by using mechanical means in the factory to pre-stretch the silicone rubber with elastic properties within the elastic range, inserting a plastic support to fix it, and using silicone rubber to inject and vulcanize various cable accessories in the factory. The components have a lasting radial pressure on the cable body, which can prevent the heat shrinkable material from generating air bubbles in the insulating layer when thermal expansion and cold contraction. It has the characteristics of small size, light weight, safety and reliability. The inner layer and the outer layer, the cavity formed by the inner layer and the outer layer is sheathed with a plastic support, and the first guide rail and the second guide rail are arranged on the inner surface and the outer surface of the plastic support to match the first guide rail inside the inner layer and the outer layer. The guide rail cavity and the first lining layer and the second guide rail cavity and the second lining layer achieve the purpose of support while maintaining the stability between the accessories of the cable, which solves the problem of friction between the support strip and the semi-conductive tape when installing the support strip. Bringing the semi-conductive tape into the insulating layer causes the problem of breakdown of the product during operation, and it is easy to install.

The setting of the PVC tape plays the role of flame retardant, heat resistance, cold resistance, wear resistance and corrosion resistance. The setting of the waterproof tape cooperates with the radial pressure of the silicone rubber elastic material on the cable, so that the cold shrinkable joint has good waterproofness, extending the cable. The service life of each accessory.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic diagram of the internal structure of a 35kv cold shrink joint according to an embodiment of the present invention;

2 is a schematic diagram of the internal structure of a cold-shrinkable intermediate joint pipe in a 35kv cold-shrinkable joint according to an embodiment of the present invention;

3 is a cross-sectional view of a plastic product and a cold-shrink intermediate joint pipe in a 35kv cold-shrink joint according to an embodiment of the present invention;

4 is a cross-sectional view of an inner protective layer in a 35kv cold shrink joint according to an embodiment of the present invention.

In the picture:

1. Connecting tube; 2. Semi-conductive tape; 3. Insulation body; 4. Cold shrinkable intermediate joint tube; 5. Semi-conductive layer; 6. Constant force spring; 7. Copper shielding layer; 8. Cable inner sheath; 9 , inner protective layer; 10, copper braided wire; 11, armored layer; 12, outer protective layer; 13, cable outer sheath; 14, plastic support; 15, inner layer; 16, outer layer; 17, cavity ; 18, the first guide rail cavity; 19, the second guide rail cavity; 20, the first lining; 21, the second lining; 22, the first guide rail; 23, the second guide rail; 24, the opening; 25, the PVC tape; 26. Waterproof belt.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art fall within the protection scope of the present invention.

According to an embodiment of the present invention, a 35kv cold shrink joint is provided.

As shown in FIGS. 1-4 , according to a 35kv cold shrinkable joint according to an embodiment of the present invention, the cold shrinkable joint includes a connecting pipe 1 , a semiconductive tape 2 , an insulating body 3 , a cold shrinkable intermediate joint pipe 4 , and a semiconductive layer 5 , constant force spring 6, copper shielding layer 7, cable inner sheath 8, inner protective layer 9, copper braided wire 10, armor layer 11, outer protective layer 12 and cable outer sheath 13, the insulating body 3 is made of The silicone rubber is injection vulcanized in the factory. The components of the cold shrinkable joint are injection vulcanized using the same material as the insulating body 3, and then expanded and lined with plastic supports 14 to form various cable accessories. Wherein, the connecting tube 1 is used to connect two cable conductors, and an insulating body 3 is extruded on each cable conductor and located on both sides of the connecting tube 1 and the semiconducting tape 2, and the semiconducting tape 2 is extruded. It is wound and connected with the connecting pipe 1 and is flush with the outer diameter of the insulating body 3 on one side of the connecting pipe 1. The cold shrinkable intermediate joint pipe 4 is arranged on the connecting pipe 1 and the semiconducting tape 2. and the outer layer of the insulating body 3 to form an integral structure of the cable accessories, the semiconducting layer 5 is arranged on the outer surface of the cold shrink intermediate joint tube 4, and the constant force spring 6 is arranged near the copper shielding layer 7 and is located on the outer surface of the cold-shrink intermediate joint tube 4, the copper shielding layer 7 is arranged on the periphery of the cable conductor and is located on one side of the cold-shrink intermediate joint tube 4, and the copper braided wire 10 is wound on the The outer part of the surface of the cold-shrinkable intermediate joint pipe 4, the outer periphery of the cold-shrinkable intermediate joint pipe 4 is provided with an inner protective layer 9 of an integral structure, and the outer periphery of the inner protective layer 9 is provided with an armoring layer 11 of an integral structure, so The outer protective layer 12 of the overall structure is provided on the periphery of the armoring layer 11, and the cable outer sheath 13 is respectively sleeved on the inner side of both ends of the outer protective layer 12;

The cold-shrinkable intermediate joint pipe 4 includes an inner layer 15 and an outer layer 16 , the inner wall of the cold-shrinkable intermediate joint pipe 4 is provided with a cavity 17 between the inner layer 15 and the outer layer 16 , and the inner layer is provided with a cavity 17 . 15 and the inside of the outer layer 16 are respectively provided with a number of first guide rail cavities 18 and second guide rail cavities 19, and the first lining layers 20 and The second lining layer 21, the plastic support 14 is hollow cylindrical and matches with the cavity 17, the inner surface and the outer surface of the plastic support 14 are respectively in line with the first guide rail cavity 18 and the The second guide rail cavity 19 is correspondingly provided with a first guide rail 22 and a second guide rail 23 .

In addition, in one embodiment, the silicone rubber used in the cold shrink joint is flame-retardant room temperature vulcanized foam silicone rubber DC3-6548. By adopting this solution, the cold shrinkable joint of the cable has good flame retardancy.

In addition, in one embodiment, a plurality of the first guide cavities 18 are evenly distributed along the circumference of the inner layer 15 , and a plurality of the second guide cavities 19 are evenly distributed along the circumference of the outer layer 16 . With this solution, the plastic support 14 can be easily pulled out during installation, and the installation is convenient.

In addition, in one embodiment, the cross section of the first guide rail cavity 18 is an inverted T shape, the cross section of the second guide rail cavity 19 is a T shape, the first lining layer 20 and the second lining layer 21 They are respectively bonded with the first guide rail cavity 18 and the second guide rail cavity 19 . In this solution, the arrangement of the first lining layer 20 and the second lining layer 21 can play the role of reinforcing ribs, and at the same time, it is convenient to extract the plastic support bar 14 .

In addition, in one embodiment, one end of the inner layer 15 and the outer layer 16 close to the connecting pipe 1 is closed and connected, and the other ends of the inner layer 15 and the outer layer 16 are provided with corresponding plastics. The opening 24 of the support 14 .

In addition, in one embodiment, the cold shrinkable joint further includes a PVC tape 25 provided on the inner side of the inner protective layer 9 and a waterproof tape 26 provided on the outer side. With this solution, the setting of the PVC tape 25 has the functions of being flame-retardant, heat-resistant, cold-resistant, wear-resistant and corrosion-resistant. The waterproofness of the cable extends the service life of the accessories of the cable.

To sum up, with the help of the above technical solutions of the present invention, the silicone rubber with elastic properties is pre-stretched within the elastic range by mechanical means in the factory, and then sleeved into the plastic support 14 to fix it, and the silicone rubber is used in the factory. The components of various cable accessories made by injection vulcanization have a lasting radial pressure on the cable body, which can prevent the heat shrinkable material from generating bubbles in the insulating layer when thermal expansion and contraction. It has the characteristics of small size, light weight, safety and reliability, etc. An inner layer 15 and an outer layer 16 are arranged inside the intermediate tube 4 of the cold shrink joint, and a plastic support 14 is sheathed in the cavity 17 formed by the inner layer 15 and the outer layer 16. A guide rail 22 and a second guide rail 23 cooperate with the first guide rail cavity 18 and the first lining layer 20 and the second guide rail cavity 19 and the second lining layer 21 inside the inner layer 15 and the outer layer 16 to achieve the purpose of support while maintaining The stability between the accessories of the cable solves the problem that when the support bar is installed, the friction between the support bar and the semi-conductive tape will bring the semi-conductive tape into the insulating layer, resulting in the breakdown of the product during operation, and the installation is convenient;

The setting of the PVC tape plays the role of flame retardant, heat resistance, cold resistance, wear resistance and corrosion resistance. The setting of the waterproof tape cooperates with the radial pressure of the silicone rubber elastic material on the cable, so that the cold shrinkable joint has good waterproofness, extending the cable. The service life of each accessory.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (6)

1. A35 kv cold-shrink joint comprises a connecting pipe (1), a semi-conductive belt (2), an insulating body (3), a cold-shrink intermediate joint pipe (4), a semi-conductive layer (5), a constant force spring (6), a copper shielding layer (7), a cable inner sheath (8), an inner protective layer (9), a copper braided wire (10), an armor layer (11), an outer protective layer (12) and a cable outer sheath (13), and is characterized in that the insulating body (3) is injection-vulcanized molded by adopting silicon rubber in a factory, each component of the cold-shrink joint is injection-vulcanized and molded by adopting the same material as the insulating body (3), and then components of various cable accessories are formed by expanding and lining with a plastic support (14), wherein the connecting pipe (1) is used for connecting two cable conductors, each semi-conductive cable conductor is positioned on the connecting pipe (1) and two sides of the semi-conductive belt (2) and is extruded with the insulating body (3), the semi-conductive belt (2) with connecting pipe (1) winding connection and with connecting pipe (1) one side insulator (3) external diameter flushes, cold-contraction middle joint pipe (4) set up in connecting pipe (1), semi-conductive belt (2) with insulator (3) skin constitutes overall structure's cable accessories, semi-conductive layer (5) set up in the surface of cold-contraction middle joint pipe (4), constant force spring (6) set up in being close to copper shield layer (7) and being located the surface of cold-contraction middle joint pipe (4), copper shield layer (7) set up in cable conductor's periphery and being located one side of cold-contraction middle joint pipe (4), copper cold-contraction wire (10) twine the outside portion surface of middle joint pipe (4), the periphery of cold-contraction middle joint pipe (4) is equipped with overall structure's inner protection layer (9), the periphery of the inner protective layer (9) is provided with an armor layer (11) with an integral structure, the periphery of the armor layer (11) is provided with an outer protective layer (12) with an integral structure, and the cable outer sheaths (13) are respectively sleeved on the inner sides of two ends of the outer protective layer (12);

shrinkage intermediate head pipe (4) include inlayer (15) and skin (16), the inner wall of shrinkage intermediate head pipe (4) just is located be equipped with cavity (17) between inlayer (15) and skin (16), inlayer (15) with the inside of skin (16) corresponds respectively and is provided with a plurality of first guide rail chamber (18) and second guide rail chamber (19), the inside of first guide rail chamber (18) and second guide rail chamber (19) is equipped with first lining (20) and second lining (21) respectively, plastic support (14) be hollow cylindrical and with cavity (17) phase-match, the internal surface and the surface of plastic support (14) respectively with first guide rail chamber (18) with second guide rail chamber (19) correspondence is provided with first guide rail (22) and second guide rail (23).

2. The 35kv cold-shrink joint according to claim 1, wherein the silicone rubber adopted by the cold-shrink joint is flame-retardant room temperature vulcanized foam silicone rubber DC 3-6548.

3. A 35kv cold shrink joint as claimed in claim 1, wherein a plurality of said first guide cavities (18) are evenly distributed along the circumference of said inner layer (15) and a plurality of said second guide cavities (19) are evenly distributed along the circumference of said outer layer (16).

4. A 35kv cold shrink joint as claimed in claim 1, wherein the first rail cavity (18) is T-shaped in cross-section and the second rail cavity (19) is T-shaped in cross-section, and the first liner (20) and the second liner (21) are bonded to the first rail cavity (18) and the second rail cavity (19), respectively.

5. A 35kv cold shrink joint according to claim 1, wherein the inner layer (15) and one end of the outer layer (16) close to the connecting tube (1) are connected in a closed manner, and the other end of the inner layer (15) and the outer layer (16) is provided with an opening (24) corresponding to the plastic support (14).

6. A 35kv cold-shrink joint according to claim 1, further comprising a PVC tape (25) disposed inside the inner protective layer (9) and a waterproof tape (26) disposed outside.

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