CN116798687B

CN116798687B - Power cable

Info

Publication number: CN116798687B
Application number: CN202310234457.8A
Authority: CN
Inventors: 许智伟; 黄俊伟; 黄立新
Original assignee: Taishan City Wanan Cable Co ltd
Current assignee: Taishan City Wanan Cable Co ltd
Priority date: 2023-03-03
Filing date: 2023-03-03
Publication date: 2024-03-22
Anticipated expiration: 2043-03-03
Also published as: CN116798687A

Abstract

The invention discloses a power cable, which comprises a plurality of sections of cable outer protective layers, wherein the sections of cable outer protective layers are distributed at equal intervals along the length direction of the cable, one side of each section of cable outer protective layer is provided with a piston part with the outer diameter larger than that of the cable outer protective layer, the other side of each section of cable outer protective layer is provided with a fixing part with the outer diameter larger than that of the cable outer protective layer, and the inner wall of the cable outer protective layer is provided with a plurality of raised supporting bars at equal intervals around a circle; the cable connecting sleeves are internally provided with a movable cavity with two open ends, and two ends of each section of cable outer protection layer are respectively arranged in the cable connecting sleeves at two sides. After the cable is buried, whether the surface layer of the cable is damaged or not can be judged in a traction mode, and after the cable is pulled, the damaged position is subjected to internal temporary isolation and sealing, so that more time is brought to rush repair, and the cable under emergency is effectively protected.

Description

Power cable

Technical Field

The invention relates to the field of power cables, in particular to a power cable.

Background

Cables, fiber optic cables, wires, etc. are commonly used transmission members that, after being deployed, span long and are often buried in pipes, thus making the repair inconvenient. The cable generally comprises an internal core wire and an external outer protective layer, so that the core wire is better protected, severe loss caused by core wire breakage is prevented, various parameters of the outer protective layer are required to be high, but the cable buried in the deep part can be damaged due to various problems, such as cutting of external force, biting of mice, aging, torsion and the like, which can cause damage to the cable protective layer, and the cable is difficult to discover the damage to the cable protective layer in time due to complex cable layout environment and large span area;

when the cable protective layer is damaged or cracked, even if the internal core wire is not damaged, the aging of the internal core wire can be accelerated after a long time, external dust, moisture, corrosive substances and the like can enter through the damaged position, so that the internal core wire is damaged in an accelerating way, the environment for laying the cable is limited by the fact that a worker is difficult to overhaul the cable conveniently, and an emergency temporary protection measure cannot be realized, so that a cable structure is urgently needed for solving the problems.

Disclosure of Invention

The technical problem to be solved by the invention is that the current cable can be judged whether to have a damage port or not according to the drawing condition by drawing the corresponding cable at the far end, so that the problem of difficult maintenance is effectively solved; when a damaged port exists, a temporary isolation measure can be carried out on the cable outer protection layer at the damaged position through the pull handle section, so that the influence of external factors on an internal core wire is prevented, more time is gained for overhaul, and the defects in the prior art are effectively solved.

The invention is realized by the following technical scheme: a power cable comprising:

the multi-section cable outer protection layer is distributed along the length direction of the cable at equal intervals, one side of each section of cable outer protection layer forms a piston part with the outer diameter larger than that of the cable outer protection layer, the other side of each section of cable outer protection layer forms a fixing part with the outer diameter larger than that of the cable outer protection layer, a plurality of raised support bars are arranged on the inner wall of the cable outer protection layer at equal intervals around one circle, and the core wire assembly is arranged in an annular support cavity formed between the support bars in a surrounding mode;

the two ends of each cable outer protection layer are respectively arranged in the cable connecting sleeves at the two sides;

the piston part is in sealing contact with the movable cavity of the cable connecting sleeve, and a first airtight cavity is formed between one side of the piston part and the limiting baffle ring of the cable connecting sleeve; the fixed part is fixedly connected with a limiting baffle ring of the cable connecting sleeve;

the core wire assembly is sealed through each of the cable outer protective layers, and a second airtight cavity is formed in the cable outer protective layer, and the first airtight cavity is communicated with the second airtight cavity.

As the preferable technical scheme, a groove is respectively formed at the two sides of each supporting bar close to the core wire assembly, an elastic bending part is arranged at the bottom surface of the groove, the elastic bending parts are spread in a natural state, and the elastic bending parts between the adjacent supporting bars are mutually contacted, so that a circle of inner isolation layer is formed outside the core wire assembly.

As the preferable technical scheme, the two sides of each supporting bar are provided with rotary buckles, the elastic bending parts are bent and buckled into the grooves, and the elastic opening of the elastic bending parts is limited by the rotary buckles; the elastic bending part comprises an elastic connecting part and a separation part, and the elastic connecting part is used for elastically connecting the support bar and the separation part.

As the preferable technical scheme, the rotary buckles are arranged on one side of each supporting bar, and the isolation parts are assembled with the contact surfaces of the grooves in a positioning way through concave-convex point structures when the isolation parts are buckled with the grooves in a bending way.

As a preferable technical scheme, the concave-convex point structure comprises a rubber convex point arranged on the isolation part and a concave point arranged on the concave groove surface, wherein the rubber convex point and the concave point are tightly clamped and assembled, when the rotary buckle is opened relative to the elastic bending part, the isolation part on the elastic bending part is opened relative to the support bar, and the convex point and the concave point are separated at the moment; the aperture of the concave point is the largest from the nearest position of the rotary buckle, the aperture of the farthest end of the rotary buckle is the smallest, and the aperture of the concave point is in a decreasing shape from the rotary buckle end.

As the preferred technical scheme, rotatory knot rotates and installs on a fixing base, fixing base one end fixed mounting is on the internal face of cable adapter sleeve, all rotates through a pivot between rotatory knot and the fixing base and is connected, all sets up a logical groove on the cable outer protective layer that corresponds every rotatory knot, the width of logical groove is greater than the width of rotatory knot, and every support bar all corresponds a logical groove, and the support bar is located the intermediate position of every logical groove, and rotatory knot passes logical groove respectively and is located the both sides of support bar for restrict the opening of elasticity bending portion, logical groove is used for connecting the first airtight chamber with the airtight chamber of second and switches on.

As the preferable technical scheme, the piston part is provided with more than one connecting rod on one side corresponding to each rotary buckle, the connecting rod is arranged around the piston part in a circle, the other end of the connecting rod is connected with a push ring, the push ring is arranged corresponding to each rotary buckle, and the rotary buckle is pushed to rotate around the rotating shaft through the push ring, so that the rotary buckle is separated from the elastic bending part.

As the preferable technical scheme, the opening inner wall of cable adapter sleeve all is provided with a plurality of first tensile sealing washer, and the cable outer protective layer passes first tensile sealing washer and stretches into the movable chamber of cable adapter sleeve, the outer wall surface of piston portion is provided with the second tensile sealing washer, through second tensile sealing washer and the sealed contact of movable chamber inner wall, and the heart yearn subassembly passes the position of piston portion and is provided with the third tensile sealing washer.

As a preferable technical scheme, the first airtight cavity and the second airtight cavity are filled with inert gas.

As an optimal technical scheme, the cable connecting sleeve is a hard connecting sleeve, a suction micropore is formed in the middle of the cable connecting sleeve, and the suction micropore is communicated with the movable cavity.

The beneficial effects of the invention are as follows: 1. according to the invention, the core wire is supported by the support bars through arranging the support bars on the inner wall of the outer protective layer of the cable, so that the impact resistance and the shearing resistance of the core wire can be improved, the core wire can be better protected, and the distance between the core wire and the outer protective layer of the cable is increased;

2. when the cable outer protective layer is not damaged in normal use, the piston part cannot move relative to the cable connecting sleeve even if the cable is pulled, so that only one pulling action is needed to be performed on the cable at the far end, the tensile condition of the cable is observed, whether a damaged port exists in the cable or not can be known, and the cable can be overhauled more conveniently;

3. when the cable outer protective layer is damaged, the piston part can move relative to the cable connecting sleeve when the cable is pulled, and the elastic bending part on the supporting bar can be opened at the moment, so that a circle of inner isolation layer is formed outside the inner core wire after the elastic bending part is opened, the purpose of emergency isolation is achieved, and the further damage of the core wire is prevented;

4. the invention realizes the cable inspection and synchronously completes the emergency protection of the cable, so that the operation is more convenient.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the overall structure of the cable of the present invention;

FIG. 2 is a schematic view of the structure of the partial section position of the cable of the present invention;

FIG. 3 is a schematic cross-sectional view of the present invention at the location of a cable connection sleeve;

FIG. 4 is an enlarged view of a portion of the invention at A in FIG. 3;

FIG. 5 is a schematic view showing a partial structure of a piston portion side of the cable outer cover of the present invention;

FIG. 6 is a schematic cross-sectional view of the cable outer cover and cable connector sleeve of the present invention;

FIG. 7 is a partial enlarged view at B in FIG. 6;

FIG. 8 is a schematic cross-sectional view of the present invention after the cable outer protective layer has been broken;

FIG. 9 is a schematic cross-sectional view of the present invention at the location of the outer protective layer of the cable;

FIG. 10 is a schematic cross-sectional view of the elastic bending portion of the present invention after opening;

FIG. 11 is a schematic view of the support bar and the elastic bending portion of the present invention;

FIG. 12 is a schematic view of a stretched sealing ring according to the present invention;

reference numerals illustrate:

1. an outer protective layer of the cable; 2. a cable connecting sleeve; 3. a suction micropore; 5. a cable inner protective layer; 6. a core wire; 7. a fixing seat; 8. a rotating shaft; 9. a rotary buckle; 10. a through groove; 11. a first stretched sealing ring; 12. a second stretched sealing ring; 13. a third stretched sealing ring; 14. a piston section; 15. a connecting rod; 16. pushing the ring; 17. a movable cavity; 18. a fixing part; 30. a first airtight chamber; 41. a support bar; 42. an elastic bending part; 50. a second airtight chamber; 100. a breakage port; 421. an isolation part; 422. a bump; 423. an elastic connection part; 424. pits; 425. a groove; 501. a first securing ring; 502. an elastic corrugated sealing layer; 503. a second fixing ring; 504. and (5) mounting holes.

Detailed Description

All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.

Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.

As shown in fig. 1-3, a power cable of the present invention includes a plurality of cable outer protective layers 1, the cable outer protective layers 1 are equidistantly arranged along the cable length direction, a piston portion 14 with an outer diameter larger than that of the cable outer protective layers 1 is formed on one side of each cable outer protective layer 1, a fixing portion 18 with an outer diameter larger than that of the cable outer protective layers 1 is formed on the other side of each cable outer protective layer 1, therefore, the outer diameters of two sides of the cable outer protective layers 1 are larger than that of the cable outer protective layers 1, a plurality of raised support bars 41 are equidistantly arranged around the inner wall of the cable outer protective layers 1, the core wire 6 assembly is mounted into an annular support cavity formed around the support bars 41, the whole core wire 6 assembly is supported by the support bars 41, so that the core wire 6 assembly is centrally arranged, as the core wire 6 assembly and the cable outer protective layers 1 are separated by the raised support bars 41, the distance between the core wire 6 assembly is increased, when sheared, the probability of cutting the core wire 6 assembly can be reduced, meanwhile, the structure of each support bar 41 can increase the anti-vibration and anti-impact capacity of the core wire 6 assembly, so that the core wire 6 assembly can be arranged in a safer structure;

in this embodiment, the core wire 6 assembly includes an inner cable protection layer 5 and a plurality of core wires 6, the plurality of core wires 6 are arranged in the inner cable protection layer 5, the inner cable protection layer 5 is supported and arranged in the middle of each supporting bar 41, and the inner cable protection layer 5 achieves the purpose of protecting the inner parts of the core wires 6. The aperture of the annular supporting cavity enclosed between the supporting bars 41 is preferably equal to the outer diameter of the cable inner protection layer 5, so that when the cable inner protection layer 5 is installed between the supporting bars 41, the shaking can be reduced, and the installation of the core wire 6 assembly can be more stable.

In this embodiment, the cable connection sleeve 2 for connecting adjacent cable outer protection layers 1 is further included, a movable cavity 17 with two open ends is formed in each cable connection sleeve 2, two limit stop rings are formed in the two open ends of the movable cavity 17, two ends of each cable outer protection layer 1 are respectively installed into the cable connection sleeves 2 on two sides, that is, after two ends of the piston part 14 and the fixing part 18 are installed into the cable connection sleeves 2, the cable outer protection layers 1 are prevented from being separated from the cable connection sleeves 2 by the limit stop rings;

the piston part 14 is in sealing contact with the movable cavity 17 of the cable connecting sleeve 2, a first airtight cavity 30 is formed between one side of the piston part 14 and the limiting baffle ring of the cable connecting sleeve 2, and the first airtight cavity 30 is formed after the piston part 14 of the cable outer protective layer 1 is filled with gas; the fixing portion 18 is fixedly connected with the limit stop ring of the cable connecting sleeve 2, and the fixing manner used by the fixing portion 18 and the limit stop ring of the cable connecting sleeve 2 can be glue fixing and sealing, the fixing connection is fixed connection, displacement cannot occur, because the fixing portion 18 and the limit stop ring are fixed in a limiting manner, when the cable is pulled, acting force can exist on one side of the piston portion 14, and as long as the first airtight cavity 30 is formed on one side of the piston portion 14, gas filled in the first airtight cavity 30 cannot be extruded, the first airtight cavity 30 always exists, the piston portion 14 cannot displace in the cable connecting sleeve 2, otherwise, if the gas in the first airtight cavity 30 runs out, the piston portion 14 can move towards the first airtight cavity 30 when the cable is pulled, that is, the piston portion 14 can displace in the cable connecting sleeve 2, the situation that the cable outer protection layer 1 on the corresponding side is broken, namely, the situation that the cable outer protection layer 1 is broken occurs is described below;

as shown in fig. 9, the core wire 6 assembly passes through each cable outer protective layer 1 in a sealing manner, at this time, a second airtight cavity 50 is formed in the cable outer protective layer 1, the first airtight cavity 30 is communicated with the second airtight cavity 50, the second airtight cavity 50 needs to be filled with gas when in use, so that after the first airtight cavity 30 and the second airtight cavity 50 are filled with gas, the gas pressure is balanced, so that as long as the cable outer protective layer 1 is not damaged, the gas in the first airtight cavity 30 and the second airtight cavity 50 can escape, as shown in fig. 8, the piston part 14 can not extrude the gas in the first airtight cavity 30 into the second airtight cavity 50 when the cable is pulled, and when the whole cable is pulled, the length of the cable is not lengthened, otherwise, the cable can be pulled after the gas is discharged along with the damaged opening 100, and the tightness after the first airtight cavity 30 and the second airtight cavity 50 are formed is described below.

In this embodiment, as shown in fig. 11, a groove 425 is formed on each of two sides of each supporting bar 41 near the core wire 6 assembly, an elastic bending portion 42 is disposed on the bottom surface of each groove 425, the elastic bending portions 42 are spread in a natural state, and the elastic bending portions 42 between the adjacent supporting bars 41 are in contact with each other, so that a circle of inner isolation layer is formed on the outer portion of the core wire 6 assembly, after the cable is laid, the elastic bending portions 42 are bent, the elastic bending portions 42 are not spread, as shown in fig. 9, and after the elastic bending portions 42 are spread elastically, an inner isolation layer is formed on the outer portion of the core wire 6 assembly, as shown in fig. 10, the inner secondary isolation protection can be used at this time, so that emergency is effectively dealt with, and the service life of the inner core wire 6 is prolonged.

In order to prevent the elastic bending portions 42 on the supporting strips 41 from being sprung apart after the cable is routed, in this embodiment, a rotary buckle 9 is disposed on both sides of each supporting strip 41, the elastic bending portions 42 are bent and buckled into the grooves 425, and the elastic bending portions 42 are restricted to be elastically spread by the rotary buckle 9;

as shown in fig. 11, the elastic bending portion 42 includes an elastic connecting portion 423 and an isolation portion 421, the elastic connecting portion 423 is used for elastically connecting the supporting strips 41 with the isolation portion 421, the rotating buckle 9 is disposed on one side of each supporting strip 41, when the isolation portion 421 is buckled with the groove 425 in a bending manner, the contact surfaces of the isolation portion 421 and the groove 425 are assembled in a positioning manner through the concave-convex point 422 structure, the elastic connecting portion 423 can be made of an elastic metal sheet or an elastic rubber sheet, the elastic connecting portion 423 is elastically stretched in a natural state, and then the isolation portion 421 is stretched, and the stretched adjacent isolation portions 421 are contacted with each other, as shown in fig. 10.

In this embodiment, the concave-convex point 422 structure includes a rubber convex point 422 disposed on the isolation portion 421, and a concave point 424 disposed on the surface of the groove 425, the rubber convex point 422 and the concave point 424 are tightly assembled, the positions of the convex point 422 and the concave point 424 can be exchanged, and when the rotary buckle 9 is opened relative to the elastic bending portion 42, the isolation portion 421 on the elastic bending portion 42 is opened relative to the support bar 41, at this time, the convex point 422 is separated from the concave point 424, and the structure of the concave-convex point 422 mainly prevents the elastic bending portion 42 at a position far from the rotary buckle 9 from being well buckled in the groove 425;

specifically, the aperture of the concave point 424 is the largest at the position closest to the turnbuckle 9, the aperture of the concave point 424 is the smallest at the position closest to the turnbuckle 9, and the aperture of the concave point 424 is gradually decreased from the end of the turnbuckle 9, so that when the turnbuckle 9 is limited at the position of the elastic bending part 42, the opening position which can be elastically opened can be limited because the looest side of the assembly force is limited, and the whole elastic bending part 42 can not be elastically opened as long as the opening position which can be elastically opened is limited at the position of the looser side of the turnbuckle 9 is limited at the position of the concave point 422, namely the elastic bending part 42 can not be elastically opened as long as the opening position which can be elastically opened is limited at the looser side of the turnbuckle 9 is limited at the position of the concave point 422;

however, when the turnbuckle 9 is pushed open, that is, when the turnbuckle 9 does not limit the side of the elastic bending portion 42, at this time, the looest position of the assembling structure of the concave-convex point 422 is directly sprung open, and since the opening position is lost, the assembling structure of the concave-convex points 422 is separated one by one from the opening position, and since the elastic bending portion 42 has elasticity, when the separation is just started, the structure of the concave-convex point 422 at the farthest end from the turnbuckle 9 is still in an assembled and unseparated state, but as more concave-convex points 422 start to separate, the length of the elastic stretching of the whole elastic bending portion 42 is longer and longer, and the elastic stretching force applied to the position of the concave-convex point 422 at the tail end is larger and larger, so that the concave point 424 and the convex point 422 are separated continuously, and finally, the whole elastic bending portion 42 is separated from the groove 425 like being torn apart, thereby realizing the purpose of elastic stretching of the whole elastic bending portion 42 after the turnbuckle 9 is separated from the elastic bending portion 42.

As shown in fig. 4 and 5, the rotary buckles 9 are rotatably mounted on a fixed seat 7, one end of the fixed seat 7 is fixedly mounted on the inner wall surface of the cable connecting sleeve 2, the rotary buckles 9 are rotatably connected with the fixed seat 7 through a rotating shaft 8, a through groove 10 is formed in the cable outer protective layer 1 corresponding to each rotary buckle 9, and the width of the through groove 10 is larger than that of the rotary buckle 9, so that the rotary buckle 9 can have a space for rotating and yielding in the front-rear direction in the through groove 10;

as shown in fig. 3, each supporting bar 41 corresponds to one through slot 10, and the supporting bars 41 are located at the middle position of each through slot 10, the rotary buckles 9 respectively pass through the through slots 10 and are located at two sides of the supporting bars 41, so as to limit the opening of the elastic bending parts 42, the width of the through slots 10 is larger than that of the supporting bars 41, after the centrally located supporting bars 41 are located at the middle position of the through slots 10, a channel is reserved on two sides for the rotary buckles 9 to pass through, so that the rotary buckles 9 can be located at two sides of the supporting bars 41 after passing through the through slots 10, so as to limit the opening of the elastic bending parts 42, and in addition, the through slots 10 can also be used for connecting and conducting the first airtight cavities 30 with the second airtight cavities 50.

In order to push the turnbuckle 9, more than one connecting rod 15 is arranged on one side of the piston part 14 opposite to each turnbuckle 9, the connecting rod 15 is arranged around the piston part 14, the other end of the connecting rod 15 is connected with a push ring 16, the push ring 16 is arranged corresponding to each turnbuckle 9, the push ring 16 pushes the turnbuckle 9 to rotate around the rotating shaft 8, then the turnbuckle 9 is separated from the elastic bending part 42, as shown in fig. 6 and 7, according to the above, the first airtight cavity 30 and the second airtight cavity 50 are sealed relative to the outside, after the air is filled, the air inside is filled with the air, the piston part 14 can push the turnbuckle 9 towards the turnbuckle 9, namely, the air tightness of the first airtight cavity 30 or the second airtight cavity 50 is broken, the first airtight layer 1 is broken, the second airtight cavity 50 is conducted with the outside, at this moment, when one end of the cable is pulled, the piston part 14 can move towards the turnbuckle 9, and then the push ring 16 pushes the turnbuckle 9 from the side surface to push the side, so that the elastic bending part 42 can be removed from the turnbuckle 9 along the rotating shaft 8, and the elastic bending part 42 can be separated from the rotating buckle 9; the second is the problem of air tightness caused by poor tightness of the cable outer protective layer 1, the cable connecting sleeve 2 and the core wire 6, so that a special sealing ring is arranged during setting and assembly.

As shown in fig. 7 and 12, the inner walls of the openings of the cable connecting sleeve 2 are provided with a plurality of first stretching sealing rings 11, the cable outer protective layer 1 passes through the first stretching sealing rings 11 and stretches into the movable cavity 17 of the cable connecting sleeve 2, the outer wall surface of the piston part 14 is provided with a second stretching sealing ring 12, the second stretching sealing ring 12 is in sealing contact with the inner walls of the movable cavity 17, and the position of the core wire 6 assembly passing through the piston part 14 is provided with a third stretching sealing ring 13; specifically, in order to ensure tightness, the structure of the stretching sealing ring in this embodiment is the same, and the stretching sealing ring includes a first fixing ring 501 and a second fixing ring 503, a mounting hole 504 is provided in the middle of the second fixing ring 503, the first fixing ring 501 is disposed on the outer ring of the second fixing ring 503, an elastic fold sealing layer 502 is disposed between the first fixing ring 501 and the second fixing ring 503, the elastic fold sealing layer 502 and the fixing ring are fixedly bonded, the contact portions of the first fixing ring 501, the second fixing ring 503, the cable connecting sleeve 2, the cable outer protective layer 1 and the core wire 6 are all sealed by glue, so as to obtain tightness, and for the reason of the elastic fold sealing layer 502, only displacement between the first fixing ring 501 and the second fixing ring 503 in the length direction is realized when the cable is pulled, the elastic fold sealing layer 502 is stretched, a sufficient stretching distance is obtained, so that the push ring 16 can contact the rotating buckle 9, and the tightness can be ensured when the cable is still kept, and the number of sealing rings can be set all the time when the cable is not kept.

The first airtight cavity 30 and the second airtight cavity 50 are filled with inert gas, the gas filling amount is as large as possible, so that the pressure value in the first airtight cavity 30 and the second airtight cavity 50 is expanded, the gas leakage can be prevented as long as the cable outer protection layer 1 is not damaged, and further, when the cable is pulled, the situation that the cable is stretched cannot occur, the piston part 14 end cannot move towards the direction of the rotary buckle 9 (because the gas in the airtight cavity is filled and is in a pressure expansion state), when the cable is laid, the cable needs to be fixed at one end far away from an operation end, and when the cable is pulled, the corresponding cable is pulled by using the pulling equipment, so that maintenance operation can be realized, and the cable is very convenient.

Wherein, the cable connecting sleeve 2 is a hard connecting sleeve, a suction micropore 3 is arranged at the middle position of the cable connecting sleeve, the suction micropore 3 is communicated with the movable cavity 17, when the piston part 14 moves towards the rotary buckle 9, external air can be sucked into the cable connecting sleeve 2 from the suction micropore 3, so that the piston part 14 can move towards the rotary buckle 9.

According to the invention, the core wire is supported by the support bars through arranging the support bars on the inner wall of the outer protective layer of the cable, so that the impact resistance and the shearing resistance of the core wire can be improved, the core wire can be better protected, and the distance between the core wire and the outer protective layer of the cable is increased;

when the cable outer protective layer is not damaged in normal use, the piston part cannot move relative to the cable connecting sleeve even if the cable outer protective layer is pulled, so that only one pulling action is needed to be performed on the cable at the far end, the tensile condition of the cable is observed, whether a damage port exists in the cable can be known, and the cable can be overhauled more conveniently; when the cable outer protective layer is damaged, the piston part can move relative to the cable connecting sleeve when the cable is pulled, and the elastic bending part on the supporting bar can be opened at the moment, so that a circle of inner isolation layer is formed outside the inner core wire after the elastic bending part is opened, the purpose of emergency isolation is achieved, and the further damage of the core wire is prevented; the invention realizes the cable inspection and synchronously completes the emergency protection of the cable, so that the operation is more convenient.

The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any changes or substitutions that do not undergo the inventive effort should be construed as falling within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

Claims

1. A power cable, comprising:

the multi-section cable outer protection layer (1), the multi-section cable outer protection layer (1) is equidistantly distributed along the length direction of the cable, one side of each section of cable outer protection layer (1) is provided with a piston part (14) with the outer diameter larger than that of the cable outer protection layer (1), the other side of each section of cable outer protection layer (1) is provided with a fixing part (18) with the outer diameter larger than that of the cable outer protection layer (1), the inner wall of the cable outer protection layer (1) is provided with a plurality of raised support bars (41) in a circle at equal intervals, and the core wire (6) component is arranged in an annular support cavity formed between the support bars (41) in a surrounding mode;

a plurality of cable connecting sleeves (2), wherein a movable cavity (17) with two open ends is formed in each cable connecting sleeve (2), a limiting baffle ring is formed at the two open ends of the movable cavity (17), and two ends of each cable outer protective layer (1) are respectively arranged in the cable connecting sleeves (2) at two sides;

the piston part (14) is in sealing contact with the movable cavity (17) of the cable connecting sleeve (2), and a first airtight cavity (30) is formed between one side of the piston part (14) and the limiting baffle ring of the cable connecting sleeve (2); the fixing part (18) is fixedly connected with a limiting baffle ring of the cable connecting sleeve (2);

the core wire (6) assembly passes through each cable outer protective layer (1) in a sealing way, a second airtight cavity (50) is formed in the cable outer protective layer (1), and the first airtight cavity (30) is communicated with the second airtight cavity (50);

a groove (425) is respectively formed on two sides of each supporting bar (41) close to the core wire (6) assembly, an elastic bending part (42) is arranged on the bottom surface of each groove (425), the elastic bending parts (42) are spread in a natural state, and the elastic bending parts (42) between the adjacent supporting bars (41) are contacted with each other, so that a circle of inner isolation layer is formed outside the core wire (6) assembly; both sides of each supporting bar (41) are provided with rotary buckles (9), the elastic bending parts (42) are bent and buckled into the grooves (425), and the elastic bending parts (42) are limited to elastically stretch by the rotary buckles (9); the elastic bending part (42) comprises an elastic connecting part (423) and a separation part (421), and the elastic connecting part (423) is used for elastically connecting the supporting bar (41) and the separation part (421).

2. A power cable according to claim 1, characterized in that: the rotary buckles (9) are arranged on one side of each supporting bar (41), and when the isolation parts (421) are buckled with the grooves (425) in a bending way, the isolation parts are assembled with the contact surfaces of the grooves (425) in a positioning way through concave-convex points (422) structure.

3. A power cable according to claim 2, characterized in that: the concave-convex point (422) structure comprises a rubber convex point (422) arranged on the isolation part (421) and a concave point (424) arranged on the surface of the groove (425), the rubber convex point (422) is tightly clamped with the concave point (424), when the rotary buckle (9) is opened relative to the elastic bending part (42), the isolation part (421) on the elastic bending part (42) is opened relative to the support bar (41), and at the moment, the convex point (422) is separated from the concave point (424); the aperture of the concave point (424) is the largest at the nearest position to the rotary buckle (9), the aperture of the farthest end from the rotary buckle (9) is the smallest, and the aperture of the concave point (424) is gradually decreased from the end of the rotary buckle (9).

4. A power cable according to claim 1 or 2, characterized in that: the rotary buckle (9) is rotatably mounted on a fixing seat (7), one end of the fixing seat (7) is fixedly mounted on the inner wall surface of the cable connecting sleeve (2), the rotary buckle (9) is rotatably connected with the fixing seat (7) through a rotating shaft (8), a through groove (10) is formed in the cable outer protection layer (1) corresponding to each rotary buckle (9), the width of the through groove (10) is larger than that of the rotary buckle (9), each supporting bar (41) corresponds to one through groove (10), the supporting bar (41) is located in the middle of each through groove (10), the rotary buckle (9) penetrates through the through grooves (10) and is located on two sides of the supporting bar (41) respectively and used for limiting the opening of the elastic bending parts (42), and the through grooves (10) are used for connecting and conducting the first airtight cavity (30) with the second airtight cavity (50).

5. A power cable according to claim 1, characterized in that: the piston part (14) is provided with more than one connecting rod (15) on one side relative to each rotary buckle (9), the connecting rod (15) surrounds the piston part (14) and is arranged in a circle, the other end of the connecting rod (15) is connected with a push ring (16), the push ring (16) is arranged corresponding to each rotary buckle (9), and after the rotary buckle (9) is pushed to rotate around the rotating shaft (8) through the push ring (16), the rotary buckle (9) is separated from the elastic bending part (42).

6. A power cable according to claim 1, characterized in that: the cable connecting sleeve is characterized in that a plurality of first stretching sealing rings (11) are arranged on the inner wall of an opening of the cable connecting sleeve (2), the cable outer protective layer (1) penetrates through the first stretching sealing rings (11) and stretches into a movable cavity (17) of the cable connecting sleeve (2), a second stretching sealing ring (12) is arranged on the outer wall surface of the piston part (14), the second stretching sealing ring (12) is in sealing contact with the inner wall of the movable cavity (17), and a third stretching sealing ring (13) is arranged at the position, penetrating through the piston part (14), of the core wire (6) component.

7. A power cable according to claim 1, characterized in that: the first airtight cavity (30) and the second airtight cavity (50) are filled with inert gas.

8. A power cable according to claim 1, characterized in that: the cable connecting sleeve (2) is a hard connecting sleeve, a suction micropore (3) is formed in the middle of the cable connecting sleeve, and the suction micropore (3) is communicated with the movable cavity (17).