CN110896207A - Integrated power cable intermediate joint sheath structure and installation method thereof - Google Patents
Integrated power cable intermediate joint sheath structure and installation method thereof Download PDFInfo
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- CN110896207A CN110896207A CN201911339817.0A CN201911339817A CN110896207A CN 110896207 A CN110896207 A CN 110896207A CN 201911339817 A CN201911339817 A CN 201911339817A CN 110896207 A CN110896207 A CN 110896207A
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- cold
- main body
- joint
- sleeve
- sheath
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/14—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
Abstract
The invention discloses an integrated power cable intermediate joint sheath structure and an installation method thereof, wherein the sheath structure comprises a cold-shrink joint main body, and a shielding net sleeve and a sheath pipe which are sequentially fixedly sleeved outside the cold-shrink joint main body; a support framework strip for expanding the cold-shrink joint main body is inserted into the cold-shrink joint main body in a penetrating manner; the two end parts of the shielding net sleeve and the protecting sleeve are respectively turned outwards towards the middle position of the cold-contraction joint main body, and a protecting sleeve turning-outwards part and a shielding net sleeve turning-outwards part are sequentially formed outside the protecting sleeve from inside to outside. According to the integrated power cable intermediate joint sheath structure, the sheath pipe and the shielding net sleeve are preassembled on the cold-shrink joint main body, the structure is simple and reasonable, the field installation steps are simplified, the wrapping belt materials are reduced, the installation efficiency of the power cable intermediate joint is obviously improved, the sheath pipe made of rubber and the cable breathe together, and the joint waterproof performance is improved.
Description
Technical Field
The invention belongs to power cable accessories, and particularly relates to an integrated power cable intermediate joint sheath structure and an installation method thereof.
Background
Along with the development of urban construction, the demand of medium and low voltage cable accessories is more and more increased, for the intermediate joint of the medium and low voltage power cable, the existing structural form and installation process are more complex, the waterproof performance is limited, and a large amount of strips need to be wound to recover the outer sheath of the cable after the main body of the intermediate joint is installed, as introduced in the installation method of the waterproof sheath of the intermediate joint of the cable disclosed in the Chinese patent with the application number of 201410024510.2, the waterproof sheath is firstly sleeved on the intermediate joint of the installed cable, the surfaces of the outer semi-conducting layers of the cable at the two sides of the intermediate joint of the cable are cleaned, locking parts are installed at the preset positions at the two ends of the waterproof sheath, self-adhesive tapes are wound at the connecting parts of the waterproof sheath and the semi-conducting layers of the cable at the two sides of the intermediate joint of the cable, a shielding copper net is sleeved outside the waterproof sheath, and the existing copper shielding net is, and finally, winding the waterproof jacket from one end of the waterproof jacket to the other end of the waterproof jacket in a 50% lap joint mode by using the waterproof insulating adhesive tape twice.
The installation quality of the intermediate joint structure which is provided with the protective sleeve firstly and then provided with the metal shielding net and the waterproof insulating adhesive tape by winding is influenced by the operation proficiency of installation workers, and the installation process is not executed in place, so that the fault rate caused by the fact that the intermediate joint is soaked in water and is affected by damp is higher and higher.
Disclosure of Invention
The technical problem solved by the invention is as follows: in order to reduce the risk of accidents caused by technical difference of installation operation of the intermediate joint and enhance the waterproof performance, the integrated power cable intermediate joint sheath structure and the installation method thereof are provided, wherein the integrated power cable intermediate joint sheath structure is simpler in field operation, easier to install and better in sealing performance.
The invention is realized by adopting the following technical scheme:
the integrated power cable intermediate joint sheath structure comprises a cold-shrink joint main body, and a shielding net sleeve and a sheath pipe which are fixedly sleeved outside the cold-shrink joint main body;
a support framework strip for expanding the cold-shrink joint main body is inserted into the cold-shrink joint main body in a penetrating manner;
the two end parts of the shielding net sleeve and the protecting sleeve are respectively turned outwards towards the middle position of the cold-contraction joint main body, and a protecting sleeve turning-outwards part and a shielding net sleeve turning-outwards part are sequentially formed outside the protecting sleeve from inside to outside.
As a preferred scheme, the intermediate head is a three-core cable intermediate head, the protective sleeve is sleeved outside the cold-shrink joint main body, and the shielding net sleeve is sleeved outside the protective sleeve.
As another preferred scheme, the intermediate head is a single-core cable intermediate head, the shielding net sleeve is sleeved outside the cold-shrink joint main body, and the protective sleeve is sleeved outside the shielding net sleeve.
In the integrated power cable intermediate joint sheath structure, the end part of the cold-shrink joint main body is exposed by the sheath tube outward turning part and the shielding mesh sleeve outward turning part.
Furthermore, the support framework strip is a cylindrical spiral structure with a hollow channel, and the inner diameter of the hollow structure is not less than the outer diameter of the cable butted with the intermediate joint.
In the integrated power cable intermediate joint sheath structure, the sheath tube is made of elastic wear-resistant rubber materials, and the end part of the outward turning part of the sheath tube, which exceeds the outward turning part of the shielding net sleeve, is provided with a mounting hole for traction.
Furthermore, at least two groups of mounting holes are uniformly formed in the end part of the outward turning part of the protective sleeve along the circumferential direction.
In the integrated power cable intermediate joint sheath structure, the shielding net sleeve is a metal wire braided net sleeve with a grid structure, the grid structure is a rhombic grid, and the diagonal line of the rhombic grid is arranged along the circumferential direction of the shielding net sleeve.
The invention also discloses an installation method of the integrated power cable intermediate joint sheath structure, which comprises the following steps:
firstly, integrally sleeving a pre-molded sheath structure on one end of a cable butted with an intermediate joint;
secondly, completing conductor connection of the cable;
thirdly, moving a sheath structure containing a cold-shrink joint main body to a joint covering the cable, drawing out a support skeleton strip from the cold-shrink joint main body, and enabling the cold-shrink joint main body to contract, cling and cover the cable insulation main body;
and fourthly, drawing the outward turning part of the protective sleeve and the outward turning part of the shielding net sleeve towards two ends of the cold-shrink joint main body, and tightly covering the end part of the cold-shrink joint main body and the cable body after the outward turning part of the protective sleeve and the outward turning part of the shielding net sleeve are turned outwards.
And in the fourth step, a drag hook is hooked into the mounting hole at the end part of the outward turning part of the protective sleeve, and the outward turning part of the protective sleeve is pulled to two ends of the cold-shrink joint main body through an external pull rope to realize the protection of the outward turning part of the protective sleeve on the covering between the end part of the cold-shrink joint main body and the cable body.
The integral power cable cold-shrinkage intermediate joint sheath structure comprises a cold-shrinkage joint main body, a cold-shrinkage joint main body and a cold-shrinkage joint main body, wherein the cold-shrinkage joint main body is sleeved with a shielding net sleeve, the shielding net sleeve is sleeved with a sheath pipe, or the cold-shrinkage joint main body is sleeved with the sheath pipe, and the shielding net sleeve is sleeved with the shielding net sleeve. Then the outward turning part of the protective sleeve is directly pulled to two ends through the arrangement, so that the outward turning part of the protective sleeve and the outward turning part of the shielding net sleeve are pulled to a position between the cold-shrink joint main body and the outer part of the cable after installation, the end part of the cold-shrink joint main body and the cable are coated and sealed by utilizing the elastic rubber material of the protective sleeve and the grid structure shrinkage characteristic of the shielding net sleeve, any strip material and other sealing materials do not need to be wrapped, and the purposes of reducing wrapped strip materials and simplifying field installation are achieved.
The cold-shrink joint main body disclosed by the invention has the advantages that the internal space is expanded under the action of the supporting framework strips, the protective sleeve adopts the rubber protective sleeve, the elastic deformation of the rubber can be adapted to the expansion deformation of the cold-shrink joint main body, the shielding net sleeve adopts a net structure, the net woven by wires containing metal materials can adapt to the change of the outer diameter of the cold-shrink joint main body along with the deformation of the net, and the protective sleeve structure of the middle joint is integrally assembled.
In conclusion, the sheath tube and the shielding net sleeve are preassembled on the cold-shrink joint main body, so that the structure is simple and reasonable, the field installation steps are simplified, the wrapping belt materials are reduced, the installation efficiency of the power cable intermediate joint is obviously improved, the sheath tube made of rubber and the cable are in the same breath, and the waterproof performance of the joint is improved.
The invention is further described with reference to the following figures and detailed description.
Drawings
Fig. 1 is an external structural schematic view of a sheath structure of an intermediate joint of an integrated power cable according to a first embodiment.
Fig. 2 is an internal cross-sectional view of the intermediate joint sheath structure of the integrated power cable according to the first embodiment.
Fig. 3 is a schematic view of an assembled state of an intermediate joint sheath structure of an integrated power cable according to the first embodiment.
Fig. 4a is a schematic view illustrating an expanded state of the metal shielding net in the first embodiment.
Fig. 4b is a schematic view illustrating a contracted state of the metal shielding net according to the first embodiment.
Fig. 5 is an external structural view of the intermediate joint sheath structure of the integrated power cable according to the second embodiment.
Fig. 6 is a schematic view of an assembled state of the intermediate joint sheath structure of the integrated power cable according to the second embodiment.
Reference numbers in the figures: 1-supporting framework strips, 2-cold-shrink joint main bodies, 3-metal shielding net sleeves, 31-outward turning parts of the shielding net sleeves, 4-rubber protective sleeves, 41-outward turning parts of the protective sleeves, 5-drag hooks, 6-mounting holes, 100-cables and 101-connecting pipes.
Detailed Description
Example one
Referring to fig. 1 and 2, the illustrated intermediate joint sheath structure of the integrated power cable is a specific embodiment of the present invention, and specifically includes a support framework strip 1, a cold-shrink joint main body 2, a metal shielding mesh sleeve 3, a rubber sheath tube 4, and the like. Wherein, cold contraction joint main part 2 is the main part of intermediate head, for inside hollow bushing structure, has the cold contraction characteristic, the inside that cold contraction joint main part 2 supports skeleton strip 1 through the cartridge and is the state of strutting, be convenient for connect the smooth cover of main part 2 on the cable with cold contraction, connect the fixed suit metal shield net cover 3 in the outside of main part 2 at cold contraction, carry out electric field shielding to the both ends of intermediate head, again on the metal shield net cover 3 fixed suit rubber sheath pipe 4, form waterproof sealing between the both ends of intermediate head and the cable.
As shown in fig. 3, after the assembly of the sheath structure is completed, the end portions of the metal shielding mesh 3 and the rubber sheath 4 exceed the end portion of the cold-shrink joint main body 2 to ensure the realization of the functions thereof, so before the assembly of the sheath structure in fig. 1 and 2, in this embodiment, the two end portions of the metal shielding mesh 3 and the rubber sheath 4 are respectively turned outwards towards the middle position of the cold-shrink joint main body 2, a sheath eversion portion 41 and a shielding mesh eversion portion 31 are sequentially formed outside the rubber sheath 4 from inside to outside, that is, the sheath eversion portion 41 is directly and tightly sleeved outside the rubber sheath 4 after being turned outwards, then the shielding mesh eversion portion 31 is turned outwards and tightly sleeved outside the sheath eversion portion 41, and the sheath eversion portion 41 is turned towards both sides.
In order to enable the ends of the metal shielding net sleeve 3 and the rubber sheath sleeve 4 which are longer than the cold-shrink joint main body 2 not to influence the smooth sleeving of the end opening of the cold-shrink joint main body 2 on the cable, when the metal shielding net sleeve 3 and the rubber sheath sleeve 4 are preassembled, the sheath sleeve outward-turning part 41 and the shielding net sleeve outward-turning part 31 are required to expose the ends of the two ends of the cold-shrink joint main body 2. Meanwhile, the length of the rubber protecting sleeve 4 is larger than that of the metal shielding net sleeve 3, when the outward turning is completed, the outward turning positions of the rubber protecting sleeve 4 and the metal shielding net sleeve 3 are the same, the length of the outward turning part 41 of the protecting sleeve after the outward turning is larger than that of the outward turning part 31 of the shielding net sleeve, mounting holes 6 for pulling are formed in the end part, exceeding the outward turning part 31 of the shielding net sleeve, of the outward turning part 41 of the protecting sleeve, and at least two groups of the mounting holes 6 are uniformly arranged in the circumferential direction of the end part of the outward turning part 41 of the protecting sleeve.
The metal shielding net sleeve 3 and the rubber protecting sleeve 4 can elastically deform to adapt to the expansion and contraction of the cold-shrink joint main body 2. Specifically, rubber sheath pipe 4 adopts the rubber sleeve structure that has stronger elasticity that extends, and the tight cover connects 2 outside rubber sheath pipes 4 of main part can be along with the shrinkage joint main part together struts and the shrink at the shrinkage. The metal shielding net sleeve 3 is a shielding net sleeve woven by a doped metal wire, as shown in fig. 4a and 4b, the metal wire of the specific woven shielding net sleeve can refer to a metal winding wire of a shielding structure of an existing intermediate structure, the shielding net sleeve has a grid structure, a rhombic grid structure is adopted in the embodiment, and diagonal lines of scattered grids are arranged along the circumferential direction of the shielding net sleeve, so that when the rhombic grid is stretched and deformed along the diagonal lines in the circumferential direction, the circumferential diameter of the metal shielding net sleeve 3 is increased, and the expansion deformation of the cold-shrink joint main body 2 and the rubber sheath pipe 4 can be adapted, as shown in fig. 4 a; when the rhombic grids are folded and deformed along the diagonal line in the circumferential direction, the circumferential diameter of the metal shielding net sleeve 3 is reduced, so that the shrinkage deformation of the cold-shrink joint main body 2 and the rubber sheath pipe 4 can be adapted, as shown in fig. 4 b.
The method for mounting the intermediate joint boot structure of the integrated power cable in the present embodiment will be described in detail below.
Firstly, the integral power cable intermediate joint sheath structure is characterized in that a framework support bar 1, a cold-shrink joint main body 2, a metal shielding net sleeve 3 and a rubber sheath tube 4 are preassembled in a factory, the metal shielding net sleeve 3 is fixedly sleeved outside the cold-shrink joint main body 2, then the rubber sheath tube 4 is fixedly sleeved outside the metal shielding net sleeve 3, the end portions of the rubber sheath tube 4 and the metal shielding net sleeve 3 are turned outwards to form a sheath tube outwards turning part 41 and a shielding net sleeve outwards turning part 31, the cold-shrink joint main body 2, the metal shielding net sleeve 3 and the rubber sheath tube 4 are integrally unfolded after being integrally preassembled and formed, and the framework support bar 1 is inserted into an inner cavity of the cold-shrink joint main body 2 to be supported, as shown in fig. 1.
When the integrated power cable intermediate joint sheath structure which is preassembled is installed,
firstly, the whole pre-molded sheath structure is sleeved on the end part of a cable 100 at one end, butted by an intermediate joint, of the intermediate joint, the end part of the cable penetrates through the hollow structure of the framework support bar 1 and then slightly moves forwards to expose the end of the cable, so that the cable can be conveniently connected with a connecting pipe 101.
Secondly, the conductor of the cable 100 is connected through the connecting pipe 101, and the connecting structure of the connecting pipe 101 may refer to an existing intermediate joint structure, and this embodiment does not describe the specific structure of the intermediate structure again.
And thirdly, moving the sheath structure containing the cold-shrink joint main body 2 to a joint covering the cable 100, extracting the support skeleton strip 1 from the cold-shrink joint main body 2, shrinking and closely coating the cold-shrink joint main body 2 on the insulating main body of the cable 100, ensuring that the cold-shrink joint main body 2 completely covers the middle joint 101 in place, and winding out the extracted support skeleton strip 1 from the cable by using a spiral structure of the support skeleton strip.
And fourthly, drawing the sheath tube outward turning part 41 and the shielding net sleeve outward turning part 31 to two ends of the cold-shrink joint main body 2, wherein the net structure of the shielding net sleeve outward turning part 31 can be directly drawn and turned over outwards, the rubber elasticity of the sheath tube outward turning part 41 is large, a draw hook 5 can be hooked into a mounting hole 6 in the end part of the sheath tube outward turning part 41, as shown in fig. 2, the sheath tube outward turning part 41 is drawn to two ends of the cold-shrink joint main body 2 through an external draw rope, the sheath tube outward turning part 41 and the shielding net sleeve outward turning part 31 are folded outwards, and then the end part of the cold-shrink joint main body and the cable body are covered in a clinging manner, as shown in fig. 3, and an electric field shielding structure and an insulating waterproof sealing structure between the middle joint.
Example two
Referring to fig. 5 and 6 in combination, the illustrated intermediate joint sheath structure of the integrated power cable is another specific embodiment of the present invention, and is used for an intermediate joint of a three-core cable, when the three-core cable is in butt joint, three cores of the cable are respectively pulled out to be in butt joint through three groups of intermediate structures, and fig. 6 is a schematic diagram of butt joint of one group of cores. In the three-core cable, in consideration of the shielding requirements among different cores, in this embodiment, the rubber sheathing tube 4 is sleeved outside the cold-shrink joint main body 2, the metal shielding mesh sleeve 3 is sleeved outside the rubber sheathing tube 4, the rubber sheathing tube 4 and the metal shielding mesh sleeve 3 also form the sheathing tube outward-turning part 41 and the metal shielding mesh sleeve 31 at two ends, the structures of the metal shielding mesh sleeve 3 and the rubber sheathing tube 4 are the same as those of the first embodiment, and in this embodiment, the length of the metal shielding mesh sleeve 3 is longer than that of the rubber sheathing tube 4.
The installation method of the three-core cable intermediate connector is basically the same as that of the first embodiment, and only in the fourth step, the sheath tube outward-turning part 41 needs to be turned to the right position, and then the shielding mesh sleeve outward-turning part 31 needs to be turned to the right position. The same steps and sheath structure are respectively used for installing the intermediate joints of the three wire cores.
The above examples are only examples for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention as herein taught may be within the scope of the present patent.
Claims (10)
1. Integral type power cable intermediate head sheath structure, its characterized in that: comprises a cold-contraction joint main body, a shielding net sleeve and a protective sleeve which are fixedly sleeved outside the cold-contraction joint main body;
a support framework strip for expanding the cold-shrink joint main body is inserted into the cold-shrink joint main body in a penetrating manner;
the two end parts of the shielding net sleeve and the protecting sleeve are respectively turned outwards towards the middle position of the cold-contraction joint main body, and a protecting sleeve turning-outwards part and a shielding net sleeve turning-outwards part are sequentially formed outside the protecting sleeve from inside to outside.
2. The integrated power cable intermediate joint sheath structure according to claim 1, wherein the intermediate joint is a three-core cable intermediate joint, the sheath pipe is sleeved outside the cold-shrink joint main body, and the shielding net sleeve is sleeved outside the sheath pipe.
3. The integrated power cable intermediate joint sheath structure according to claim 1, wherein the intermediate joint is a single-core cable intermediate joint, the shielding mesh sleeve is sleeved outside the cold-shrink joint main body, and the sheath pipe is sleeved outside the shielding mesh sleeve.
4. A unitary power cable intermediate joint jacket structure of claim 2 or 3, said jacket tube evaginations and shielding mesh evaginations exposing ends of the cold shrink joint body.
5. The unitary power cable intermediate joint boot structure of claim 2 or 3, the supporting skeleton strip being a cylindrical spiral structure having a hollow channel, the inner diameter of the hollow structure being not less than the outer diameter of the cable to which the intermediate joint is mated.
6. The integral power cable intermediate joint sheath structure according to claim 2 or 3, wherein the sheath tube is made of elastic wear-resistant rubber material, and the end of the sheath tube outward turning part beyond the shielding mesh sleeve outward turning part is provided with a mounting hole for pulling.
7. The unitary power cable intermediate joint boot structure of claim 6, wherein the ends of the boot tube evaginations are uniformly provided with at least two sets of mounting holes along the circumferential direction.
8. The integral type power cable intermediate head sheath structure of claim 6, the shielding net cover is a metal wire braided net cover with a grid structure, the grid structure is a rhombic grid, and diagonals of the rhombic grid are arranged along the circumferential direction of the shielding net cover.
9. A method of installing an integral power cable intermediate joint sheathing structure according to claims 1 to 8, characterised by the steps of:
firstly, integrally sleeving a pre-molded sheath structure on one end of a cable butted with an intermediate joint;
secondly, completing conductor connection of the cable;
thirdly, moving a sheath structure containing a cold-shrink joint main body to a joint covering the cable, drawing out a support skeleton strip from the cold-shrink joint main body, and enabling the cold-shrink joint main body to contract, cling and cover the cable insulation main body;
and fourthly, drawing the outward turning part of the protective sleeve and the outward turning part of the shielding net sleeve towards two ends of the cold-shrink joint main body, and tightly covering the end part of the cold-shrink joint main body and the cable body after the outward turning part of the protective sleeve and the outward turning part of the shielding net sleeve are turned outwards.
10. The method for installing the sheath structure of the intermediate joint of the integral power cable as claimed in claim 9, wherein in the fourth step, a draw hook is hooked into the installation hole at the end part of the outward turning part of the sheath tube, and the outward turning part of the sheath tube is drawn towards the two ends of the cold-shrink joint main body through an external draw rope, so that the outward turning part of the sheath tube covers and protects the end part of the cold-shrink joint main body and the cable body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911339817.0A CN110896207A (en) | 2019-12-23 | 2019-12-23 | Integrated power cable intermediate joint sheath structure and installation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911339817.0A CN110896207A (en) | 2019-12-23 | 2019-12-23 | Integrated power cable intermediate joint sheath structure and installation method thereof |
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| CN110896207A true CN110896207A (en) | 2020-03-20 |
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| CN201911339817.0A Pending CN110896207A (en) | 2019-12-23 | 2019-12-23 | Integrated power cable intermediate joint sheath structure and installation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102215560B1 (en) * | 2020-06-12 | 2021-02-15 | (주)유탑엔지니어링건축사사무소 | Architectural bellows type optical cable tray |
| CN112474643A (en) * | 2020-11-13 | 2021-03-12 | 长缆电工科技股份有限公司 | Cleaning and detecting equipment for inner wall of insulating hollow sleeve and sleeve cleaning method |
-
2019
- 2019-12-23 CN CN201911339817.0A patent/CN110896207A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102215560B1 (en) * | 2020-06-12 | 2021-02-15 | (주)유탑엔지니어링건축사사무소 | Architectural bellows type optical cable tray |
| CN112474643A (en) * | 2020-11-13 | 2021-03-12 | 长缆电工科技股份有限公司 | Cleaning and detecting equipment for inner wall of insulating hollow sleeve and sleeve cleaning method |
| CN112474643B (en) * | 2020-11-13 | 2023-12-12 | 长缆电工科技股份有限公司 | Cleaning and detecting equipment for inner wall of insulating hollow sleeve and sleeve cleaning method |
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