CN-122025241-A - Extrusion-resistant low-voltage crosslinked polyethylene insulated cable

CN122025241ACN 122025241 ACN122025241 ACN 122025241ACN-122025241-A

Abstract

The invention relates to the technical field of crosslinked polyethylene insulated cables, and provides an anti-extrusion low-voltage crosslinked polyethylene insulated cable which comprises a conductor, an inner shielding layer, a crosslinked polyethylene insulated layer, an outer shielding layer, an armor layer, an outer sheath, an integral outer protective layer, an anti-extrusion ring, a communicating pipe and an air pressure sensor, wherein the inner shielding layer, the crosslinked polyethylene insulated layer, the outer shielding layer, the armor layer and the outer sheath are sequentially wrapped outside the conductor. Through above-mentioned technical scheme for receive static or dynamic extrusion in the cable installation, the laying in-process in the prior art and can take place irreversible damage, influence the problem of cable stability in use.

Inventors

BAI JINGUANG
LI YILEI
Guo Haojing
Geng Ziliang
GUO NINGNING
ZHANG XINGHUAN
ZHANG JIAN
YIN TENGFEI

Assignees

通缆电工股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260330

Claims (7)

1. The utility model provides an anti low pressure crosslinked polyethylene insulated cable of extrusion, includes conductor (1) and wraps gradually in inside shielding layer (2), crosslinked polyethylene insulating layer (3), outer shielding layer (4), armor (5) and oversheath (6) of conductor (1) outside, its characterized in that still includes: an integral outer protective layer (7), wherein the integral outer protective layer (7) can be folded and wrapped outside the outer sheath (6); The anti-extrusion rings are provided with a plurality of anti-extrusion rings, the anti-extrusion rings are detachably arranged outside the integral outer protective layer (7), and the anti-extrusion rings are of rigid structures so as to resist external extrusion; The anti-extrusion rings are of hollow structures, and two adjacent anti-extrusion rings are communicated through the communication pipe (12); The air pressure sensor (13) is communicated with the anti-extrusion ring at the end part through the communicating pipe (12) and is used for detecting air pressure change generated by extrusion deformation of the anti-extrusion ring.
2. The extrusion-resistant low-voltage crosslinked polyethylene insulated cable according to claim 1, wherein the extrusion-resistant ring comprises two semi-rings (8), a semi-connecting ring (9) is arranged in the semi-rings (8) in a sealing sliding manner, the two semi-connecting rings (9) can be spliced into a whole ring, one semi-connecting ring (9) is fixedly connected with a poking block (10), and an arc-shaped moving groove for the poking block (10) to move is formed in the semi-rings (8).
3. The extrusion-resistant low-voltage crosslinked polyethylene insulated cable according to claim 2, wherein the semi-rings (8) are communicated with a communicating seat (14), one ends of the two semi-connecting rings (9) close to each other are provided with air vents, when the semi-connecting rings (9) rotate to a certain angle to limit the semi-rings (8), the air vents correspond to the communicating seat (14), the communicating seat (14) is provided with a communicating opening, the inside of the communicating seat (14) is provided with an opening and closing member, and the end part of the communicating tube (12) is communicated with a cannula (15) for driving the opening and closing member to open and close the communicating opening.
4. A low voltage cross-linked polyethylene insulated cable according to claim 3, wherein the shutter comprises: A support plate (16), wherein the support plate (16) is fixedly arranged inside the communication seat (14); The plugging plate (17), plugging plate (17) slide and set up on backup pad (16), the position of plugging plate (17) with the position of intercommunication mouth corresponds, plugging plate (17) with be provided with compression spring (19) between backup pad (16), intubate (15) are inserted the inside of intercommunication mouth will plugging plate (17) top is kept away from the intercommunication mouth is in order to realize intubate (15) with the intercommunication of intercommunication seat (14), the air vent has been seted up to the tip of intubate (15).
5. The extrusion resistant low voltage crosslinked polyethylene insulated cable of claim 4, wherein the stop member comprises: The fixed tube (20), fixed tube (20) and the intubate (15) are fixedly connected, the inside of fixed tube (20) is slidably equipped with movable rod (22), be provided with spacing spring (23) between movable rod (22) and the inner wall of fixed tube (20); The wedge block (21), wedge block (21) with movable rod (22) fixed connection, the outside fixed cover of intercommunication seat (14) is equipped with spacing ring (24), intubate (15) insert when the inside of intercommunication mouth, wedge block (21) chucking is in on spacing ring (24) in order to right intubate (15) is spacing.
6. The extrusion-resistant low-voltage crosslinked polyethylene insulated cable according to claim 5, wherein a sealing ring is fixedly connected to one end of the plugging plate (17) close to the communication port, and the sealing ring is tightly attached to the inner wall of the communication seat (14).
7. The extrusion-resistant low-voltage crosslinked polyethylene insulated cable according to claim 6, wherein a plurality of limit strips (11) are fixedly connected to the outside of the integral outer protective layer (7), the limit strips (11) are equidistantly arranged on the integral outer protective layer (7), and the extrusion-resistant ring is positioned between two adjacent limit strips (11) and is in contact with the limit strips (11).

Description

Extrusion-resistant low-voltage crosslinked polyethylene insulated cable Technical Field The invention relates to the technical field of crosslinked polyethylene insulated cables, in particular to an anti-extrusion low-voltage crosslinked polyethylene insulated cable. Background The low-voltage crosslinked polyethylene insulated cable is widely applied to fixed laying occasions such as building power distribution, industrial equipment, rail transit, infrastructure and the like due to excellent electrical properties (such as heat resistance and aging resistance), mechanical strength and relatively low cost, and in practical application, the cable is often subjected to complex mechanical stress environments, such as multi-layer dense laying of the cable in a bridge and a wire tube, the lower cable bears static extrusion of the weight and edge pressure of the upper cable for a long time, and the cable can suffer from dynamic impact of trampling, tool falling or unexpected impact of construction machinery in the process of installation and maintenance. The existing low-voltage crosslinked polyethylene insulated cable has single structure and poor stress dispersion, the hardness, elastic modulus and compressive strength of the traditional homogeneous sheath have physical upper limits, and when the traditional homogeneous sheath is extruded, the stress is directly transmitted to the insulating layer, so that the crosslinked polyethylene insulating layer is easily deformed or damaged irreversibly, and the long-term stability of the electrical performance is influenced. Disclosure of Invention The invention provides an anti-extrusion low-voltage crosslinked polyethylene insulated cable, which is used for solving the problem that in the prior art, irreversible damage can occur when the cable is extruded statically or dynamically in the process of installation and laying of the cable, and the service stability of the cable is affected. The technical scheme of the invention is as follows: An anti-extrusion low-voltage crosslinked polyethylene insulated cable, which comprises a conductor, an inner shielding layer, a crosslinked polyethylene insulating layer, an outer shielding layer, an armor layer and an outer sheath, wherein the inner shielding layer, the crosslinked polyethylene insulating layer, the outer shielding layer, the armor layer and the outer sheath are sequentially wrapped outside the conductor, and the cable further comprises: the integral outer protective layer can be folded and wrapped outside the outer sheath; the anti-extrusion rings are provided with a plurality of anti-extrusion rings, the anti-extrusion rings are detachably arranged outside the integral outer protective layer, and the anti-extrusion rings are of rigid structures so as to resist external extrusion; the anti-extrusion rings are hollow structures, and two adjacent anti-extrusion rings are communicated through the communication pipe; the air pressure sensor is communicated with the anti-extrusion ring at the end part through the communicating pipe and is used for detecting air pressure change generated by extrusion deformation of the anti-extrusion ring. For realizing the detachable connection of anti extrusion ring, anti extrusion ring includes two semi-rings, the inside seal slip of semi-ring is provided with half go-between, two half go-between can splice into the full ring, one of them half go-between fixedly connected with stirs the piece, offered on the semi-ring and supplied stir the arc removal groove that the piece removed. For realizing communicating pipe and anti extrusion ring's intercommunication, the intercommunication has the intercommunication seat on the semi-ring, two the one end that semi-link is close to each other has seted up the air vent, works as the semi-link is rotatory to certain angle is right after the semi-ring is spacing, the air vent with the position of intercommunication seat corresponds, the intercommunication mouth has been seted up on the intercommunication seat, the inside of intercommunication seat is provided with the switching piece, the tip intercommunication of communicating pipe has and is used for the drive the switching piece is right the intubate that the intercommunication mouth carries out switching, be provided with on the intubate be used for with the intubate restriction is in locating part on the intercommunication seat, the switching piece includes: the support plate is fixedly arranged in the communication seat; The plugging plate is arranged on the supporting plate in a sliding manner, the position of the plugging plate corresponds to the position of the communication port, a compression spring is arranged between the plugging plate and the supporting plate, the plugging pipe is inserted into the inner part of the communication port to push the plugging plate away from the communication port so as to realize the communication between the plugging pipe and the communication seat,