CN113674908B

CN113674908B - Flame-retardant and fire-resistant power cable resistant to spray vibration

Info

Publication number: CN113674908B
Application number: CN202110976837.XA
Authority: CN
Inventors: 王国权; 路鑫; 淮平; 冯成; 席娇娜
Original assignee: Jiangsu Hengtong Wire and Cable Technology Co Ltd
Current assignee: Jiangsu Hengtong Wire and Cable Technology Co Ltd
Priority date: 2021-08-24
Filing date: 2021-08-24
Publication date: 2022-07-08
Anticipated expiration: 2041-08-24
Also published as: WO2023024596A1; CN113674908A

Abstract

The invention discloses a spray vibration resistant flame-retardant fire-resistant power cable which comprises a flame-retardant outer cover, wherein an outer waterproof belt is arranged in the flame-retardant outer cover, a flame-retardant inner cover is arranged in the outer waterproof belt, the inner wall of the flame-retardant inner cover is connected with a vibration-proof assembly, and the inner side of the vibration-proof assembly is connected with a conductor. The invention provides a spray vibration resistant flame-retardant fire-resistant power cable, which can be used for a long time under the condition of long-time spraying by matching with double-layer waterproofing of an outer waterproof belt and an inner waterproof layer, wherein an inner ring can move in the radial direction of an outer ring, so that one part of a vibration-proof assembly can be compressed, the other part of the vibration-proof assembly can be stretched, an inner sleeve drives a main shaft to rotate around a central block, and springs at different positions can be compressed or stretched in the rotating process of the main shaft, so that the springs absorb the power of vibration and are matched with the rotation of the main shaft, the energy generated by the vibration is converted into potential energy and centrifugal force, the energy is absorbed quickly, and the vibration-proof purpose is achieved.

Description

Flame-retardant and fire-resistant power cable resistant to spray vibration

Technical Field

The invention relates to the field of flame-retardant and fire-resistant power cables, in particular to a flame-retardant and fire-resistant power cable resistant to spray vibration.

Background

The fire-resistant electric wire and cable refers to an electric cable which can maintain normal operation for a certain time under the condition that external flame is still burnt in the fire accident of the electric wire and cable, maintain the integrity of the electric wire and cable line and maintain the normal operation of line equipment.

The fire-resistant electric wire and cable can be divided into two grades according to the national standard: class a and class B. Generally denoted as NHA-class and NHB-class. Whether a wire and cable product belongs to a fire-resistant wire and cable is judged, and the judgment is not related to whether the wire and cable product has self-extinguishing property. The greatest function of the flame-retardant electric wire and cable is the flame retardancy of the electric wire and cable product itself. The fire-resistant electric wire and cable can normally keep normal operation for at least 180 minutes at the flame temperature of 750-800 ℃.

There is also a special type of fire resistant cable known as fire resistant wire cable. It is made up by using seamless copper pipe as protective sleeve and using magnesium oxide as insulating material. Due to the particularity of the material, the fireproof electric wire and cable can not burn or delay burning. Experiments show that: the fireproof electric wire and cable still normally operate at 800-900 ℃ for 2 hours, and still continuously normally operate within 30 minutes at 1000 ℃.

At present, there are two kinds of rigid and flexible fireproof cables in the market, and its main difference is: the rigid copper core copper sheath mineral insulated cable takes magnesium oxide as insulation; the flexible copper core rolled copper sheath fireproof cable takes a mica tape as insulation. The cables with the two structures are produced on special equipment, the equipment investment is large, the cable processing technology is complex, the insulation is easy to damp, and the construction and the installation are inconvenient. And because the intensity of rigidity fireproof cable is higher, and is great to the protection intensity of sinle silk, under the regional environment of part high vibration, its rigidity fireproof cable leads to inside sinle silk to take place to break away from under the vibration of high strength easily, and under the regional environment of high vibration, its flexible fireproof cable is under the vibration of high strength, and its sinle silk is not break off from differently, and under the bending state of great length, flexible fireproof cable leads to the sinle silk to take place the rupture problem.

Disclosure of Invention

Aiming at the problems in the related art, the invention provides a flame-retardant and fire-resistant power cable resistant to spray vibration, which aims to overcome the technical problems in the prior related art.

The technical scheme of the invention is realized as follows:

the utility model provides a fire-retardant fire-resistant power cable of resistant vibration that sprays, includes fire-retardant outer quilt, be provided with outer waterproof band in the fire-retardant outer quilt, set up fire-retardant interior quilt in the outer waterproof band, the inner wall of fire-retardant interior quilt meets with the antivibration subassembly, the inboard and the conductor of antivibration subassembly are connected.

Further, the conductor includes copper conductor, interior waterproof layer, insulating layer and shielding layer, the outside cladding insulating layer of copper conductor, the outside cladding shielding layer of insulating layer, the shielding layer is arranged in interior waterproof layer, and interior waterproof layer intussuseption is filled with the thermal-insulated stopping material of cladding shielding layer.

Further, the flame-retardant inner quilt comprises an inner tegument and a bending assembly, the inner tegument and the bending assembly are connected in a staggered mode, and the outer wall of the inner tegument is connected with the inner wall of the outer waterproof belt;

the bending assembly comprises a first rotating disk, a second rotating disk, connecting rods, a front seat and a rear seat, the first rotating disk and the second rotating disk are respectively inserted into the side faces of adjacent inner teguments, the front seat and the rear seat are respectively fixed at two ends of the connecting rods, the rear seat of the front connecting rod is movably connected with the front seat of the rear connecting rod through a pin shaft, and the front seat and the rear seat of the two connecting rods positioned at the outermost sides are respectively fixed on the first rotating disk and the second rotating disk.

Furthermore, the four anti-vibration assemblies are in a group, each group of anti-vibration assemblies are arranged in a single inner coating layer at equal intervals, each anti-vibration assembly comprises an outer ring, an inner ring, a limiting ring, a central block, a main shaft, an outer sleeve, an inner sleeve and a spring, the outer ring is fixed on the inner wall of the inner coating layer, the limiting rings are distributed on the inner circumferential surface of the outer ring at equal intervals, and a ring of annular groove is processed on the inner circumferential surface of each limiting ring;

a circle of baffle ring is fixed on the peripheral surface of the central block, the central block is inserted into the limiting ring, the baffle ring is inserted into the ring groove, the central block rotates around the limiting ring, and a vertical main shaft is fixed on one side of the central block;

the inner ring is sleeved on the outer wall of the inner waterproof layer, pin bosses are fixed on the outer wall of the inner ring opposite to the outer ring, the pin bosses correspond to the limiting rings one by one, the pin bosses are connected with the outer sleeve, the spring is arranged in the outer sleeve, and one end of the spring is fixed with the inner wall of the outer sleeve;

the main shaft is sleeved with a rotary inner sleeve, and the inner sleeve is inserted into the outer sleeve and connected with the other end of the spring.

Further, the shortest distance between the adjacent inner layers is not less than 5cm, and the inner layers are formed by wrapping the flame retardant impregnated multiple layers of alkali-free glass ribbons.

Furthermore, the front seat and the rear seat are respectively positioned at the circle centers of the first rotating disk and the second rotating disk, an included angle formed by planes of the front seat and the rear seat is smaller than 15 degrees, the sections of the first rotating disk and the second rotating disk are T-shaped, a T-shaped groove for inserting the first rotating disk and the second rotating disk is machined in the inner tegument layer, and the first rotating disk and the second rotating disk rotate in the T-shaped groove.

Further, the inner ring and the outer ring are concentric in a non-vibration state, and when the inner ring vibrates, the inner ring moves in the outer ring through the vibration-proof assembly to absorb kinetic energy generated by vibration.

Furthermore, the center block is of a circular structure, and the main shaft is located at a position eccentric from the center of the center block.

The technical scheme has the following advantages or beneficial effects:

1. the invention provides a spray vibration resistant flame-retardant fire-resistant power cable, wherein the flame-retardant outer cover and the flame-retardant inner cover have good chemical corrosion resistance, high temperature resistance, oxidation resistance, weather resistance, processability, fatigue resistance and creep resistance, and can achieve the purpose of long-time use under the state of long-time spraying by matching with double-layer water proofing of an outer waterproof belt and an inner waterproof layer.

2. The invention provides a spray vibration resistant flame-retardant fire-resistant power cable, which is characterized in that a plurality of inner teguments and bending assemblies are arranged in a staggered manner, so that the purpose of bending between the adjacent inner teguments through the bending assemblies is realized, adjacent connecting rods can rotate around a front seat and a rear seat, the bending angle and smoothness of the bending assemblies are higher through the plurality of connecting rods, the bending curvature is more balanced, the connecting rods are used for protecting conductors from being too large in bending angle, the bending is limited in bending, the local bending angle cannot be too large, and the power cable is damaged.

3. The invention provides a flame-retardant fire-resistant power cable resistant to spray vibration, wherein under the influence of vibration of an inner ring or an outer ring, the inner ring can move in the radial direction of the outer ring, so that a part of vibration-proof assemblies can be compressed, the other part of vibration-proof assemblies can be stretched, an inner sleeve drives a main shaft to rotate around a central block, and springs at different positions can be compressed or stretched in the rotation process of the main shaft, so that the springs absorb the power of vibration and are matched with the rotation of the main shaft, the energy generated by the vibration is converted into potential energy and centrifugal force, and the purpose of vibration prevention is achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is an overall perspective view of a flame retardant and fire resistant power cable resistant to spray vibration according to an embodiment of the present invention;

fig. 2 is a flame retardant inner cover structure of a flame retardant and fire resistant power cable resistant to spray vibration according to an embodiment of the present invention;

FIG. 3 is a view of a bending assembly of a flame retardant and fire resistant power cable resistant to spray vibration according to an embodiment of the invention;

fig. 4 is a diagram of an un-vibrated state of a vibration preventing assembly of a flame retardant fire resistant power cable resistant to shower vibration according to an embodiment of the present invention;

fig. 5 is a perspective view of a vibration-proof assembly of a flame-retardant fire-resistant power cable resistant to spray vibration according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of a vibration-proof assembly of a flame-retardant fire-resistant power cable resistant to spray vibration according to an embodiment of the present invention;

fig. 7 is an exploded view of a vibration isolation assembly of a flame retardant fire resistant power cable resistant to shower vibration according to an embodiment of the present invention;

fig. 8 is a vibration state diagram of an anti-vibration assembly of a flame-retardant fire-resistant power cable resistant to shower vibration according to an embodiment of the present invention.

In the figure:

1. a flame-retardant outer cover; 2. an outer waterproof band; 3. a flame-retardant inner cover; 31. an inner layer; 32. bending the assembly; 321. a first rotating disk; 322. a second rotating disk; 323. a connecting rod; 324. a front seat; 325. a rear seat; 4. a vibration isolation assembly; 41. an outer ring; 411. a pin boss; 42. an inner ring; 43. a limiting ring; 431. a ring groove; 44. a center block; 441. a baffle ring; 45. a main shaft; 46. an outer sleeve; 47. an inner sleeve; 48. a spring; 5. a conductor; 51. a copper conductor; 52. an inner waterproof layer; 53. an insulating layer; 54. a shielding layer; 6. and (4) heat insulation filler.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.

Referring to fig. 1-8 show a fire-retardant fire-resistant power cable who is able to bear or endure vibration of spraying, including fire-retardant outer quilt 1, fire-retardant outer quilt 1 set up be used for realizing power cable's preliminary fire-retardant, carry out fire-resistant processing, be provided with outer waterproof tape 2 in the fire-retardant outer quilt 1, outer waterproof tape 2 adopts the preparation of water-fast material, be used for power cable's preliminary waterproof, set up in outer waterproof tape 2 fire-retardant in by 3, connect with antivibration subassembly 4 by 3's inner wall in the fire-retardant, antivibration subassembly 4's inboard is connected with conductor 5, carry out the secondary fire-retardant by 3 in the fire-retardant through setting up, avoid single fire-retardant mode to accomplish complete fire-retardant mode, antivibration subassembly 4 that sets up protects conductor 5, avoid the vibration to cause the damage.

The conductor 5 comprises a copper conductor 51, an inner waterproof layer 52, an insulating layer 53 and a shielding layer 54, the insulating layer 53 is coated outside the copper conductor 51, the shielding layer 54 is coated outside the insulating layer 53, the shielding layer 54 is arranged in the inner waterproof layer 52, the heat insulation filler 6 for coating the shielding layer 54 is filled in the inner waterproof layer 52, the arranged shielding layer 54 and the insulating layer 53 are arranged at a concentric angle, the phenomenon of uneven distribution of the electric field intensity of the insulation is avoided, smooth peeling during assembly is ensured, the bending and voltage resistance performance are excellent, no crack exists on the surface, voltage resistance and insulation are not broken down after winding, the flame-retardant outer quilt 1 and the flame-retardant inner quilt 3 have good chemical corrosion resistance and high temperature resistance, the double-layer waterproof structure has the advantages of oxidation resistance, weather resistance, processability, fatigue resistance and creep resistance, and can be used for a long time under the condition of spraying for a long time by matching with the double-layer waterproof structure consisting of the outer waterproof belt 2 and the inner waterproof layer 52.

The flame-retardant inner quilt 3 comprises an inner quilt layer 31 and a bending assembly 32, the inner quilt layer 31 and the bending assembly 32 are connected in a staggered mode, the outer wall of the inner quilt layer 31 is connected with the inner wall of the outer waterproof belt 2, the adjacent inner quilt layers 31 are bent through the bending assembly 32 through the arrangement that the inner quilt layers 31 and the bending assembly 32 are arranged in a staggered mode, and the bending is limited, so that the phenomenon that the local bending angle is too large and the power cable is damaged is avoided;

the bending assembly 32 comprises a first rotating disc 321, a second rotating disc 322, connecting rods 323, a front seat 324 and a rear seat 325, wherein the first rotating disc 321 and the second rotating disc 322 are respectively inserted into the side surfaces of the adjacent inner layer 31, the first rotating disc 321 and the second rotating disc 322 can rotate around the inner layer 31, the front seat 324 and the rear seat 325 are respectively fixed on the two ends of the connecting rods 323, the rear seat 325 of the front connecting rod 323 is movably connected with the front seat 324 of the rear connecting rod 323 through a pin shaft, the front seat 324 and the rear seat 325 of the two outermost connecting rods 323 are respectively fixed on the first rotating disc 321 and the second rotating disc 322, the adjacent connecting rods 323 can rotate around the space between the front seat 324 and the rear seat 325, and through the plurality of connecting rods 323, the bending angle and smoothness of the bending assembly 32 are higher, and the bending curvature is more balanced, so that the conductor 5 is protected from being bent by too large angle;

the shortest distance between adjacent inner layers 31 is not less than 5cm, and the inner layers 31 are formed by wrapping a plurality of layers of alkali-free glass ribbons after being impregnated with flame retardant.

The front seat 324 and the rear seat 325 are respectively positioned at the centers of the first rotating disk 321 and the second rotating disk 322, the included angle formed by the planes of the front seat 324 and the rear seat 325 is less than 15 degrees, the cross sections of the first rotating disk 321 and the second rotating disk 322 are T-shaped, a T-shaped groove for the first rotating disk 321 and the second rotating disk 322 to insert is processed on the inner layer 31, the first rotating disk 321 and the second rotating disk 322 rotate in the T-shaped groove, and the first rotating disk 321 and the second rotating disk 322 rotate in the T-shaped groove and cannot be separated;

the four anti-vibration assemblies 4 are in a group, each group of anti-vibration assemblies 4 is arranged in a single inner layer 31 at equal intervals, each anti-vibration assembly 4 comprises an outer ring 41, an inner ring 42, a limiting ring 43, a central block 44, a main shaft 45, an outer sleeve 46, an inner sleeve 47 and a spring 48, the outer ring 41 is fixed on the inner wall of the inner layer 31, the limiting rings 43 are distributed on the inner circumferential surface of the outer ring 41 at equal intervals, and a ring of annular groove 431 is processed on the inner circumferential surface of each limiting ring 43;

a ring of baffle rings 441 are fixed on the outer circumferential surface of the center block 44, the center block 44 is inserted into the limiting ring 43, the baffle rings 441 are inserted into the ring grooves 431, the center block 44 rotates around the limiting ring 43, a vertical main shaft 45 is fixed on one side of the center block 44, the center block 44 rotates in the limiting ring 43 in a mode that the arranged baffle rings 441 are inserted into the ring grooves 431, and the center block 44 cannot be separated from the limiting ring 43;

the inner ring 42 is sleeved on the outer wall of the inner waterproof layer 52, pin bosses 411 are fixed on the outer wall of the inner ring 42 opposite to the outer ring 41, the pin bosses 411 correspond to the limiting rings 43 one by one, the pin bosses 411 are connected with the outer sleeve 46, the spring 48 is arranged in the outer sleeve 46, and one end of the spring 48 is fixed with the inner wall of the outer sleeve 46;

the main shaft 45 is sleeved with a rotary inner sleeve 47, the inner sleeve 47 is inserted into the outer sleeve 46 and connected with the other end of the spring 48, the inner sleeve 47 is inserted into the outer sleeve 46, when vibration is generated, the inner ring 42 and the outer ring 41 are concentric in a non-vibration state, and when vibration is generated, the inner ring 42 moves in the outer ring 41 through the anti-vibration assembly 4 and is used for absorbing kinetic energy generated by vibration.

The central block 44 is a circular structure, the main shaft 45 is located at a position eccentric from the central block 44, under the influence of vibration of the inner ring 42 or the outer ring 41, the inner ring 42 moves in the radial direction of the outer ring 41, which causes a part of the anti-vibration assemblies 4 to be compressed, and the other part of the anti-vibration assemblies 4 to be stretched, the inner sleeve 47 drives the main shaft 45 to rotate around the central block 44, and in the rotating process of the main shaft 45, the springs 48 at different positions compress or stretch, so that the springs 48 absorb the power of the vibration and cooperate with the rotation of the main shaft 45 to convert the energy generated by the vibration into potential energy and centrifugal force, thereby rapidly absorbing the energy and achieving the purpose of anti-vibration.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a fire-retardant fire-resistant power cable of resistant vibration that sprays which characterized in that: comprises a flame-retardant outer cover (1), and is characterized in that: an outer waterproof belt (2) is arranged in the flame-retardant outer quilt (1), a flame-retardant inner quilt (3) is arranged in the outer waterproof belt (2), the inner wall of the flame-retardant inner quilt (3) is connected with a vibration-proof assembly (4), and the inner side of the vibration-proof assembly (4) is connected with a conductor (5);

the conductor (5) comprises a copper conductor (51), an inner waterproof layer (52), an insulating layer (53) and a shielding layer (54), the insulating layer (53) is coated outside the copper conductor (51), the shielding layer (54) is coated outside the insulating layer (53), the shielding layer (54) is arranged in the inner waterproof layer (52), and the inner waterproof layer (52) is filled with a heat insulation filler (6) for coating the shielding layer (54);

the flame-retardant inner quilt (3) comprises an inner quilt layer (31) and a bending assembly (32), the inner quilt layer (31) and the bending assembly (32) are connected in a staggered mode, and the outer wall of the inner quilt layer (31) is connected with the inner wall of the outer waterproof belt (2);

the bending assembly (32) comprises a first rotating disk (321), a second rotating disk (322), a connecting rod (323), a front seat (324) and a rear seat (325), the first rotating disk (321) and the second rotating disk (322) are respectively inserted into the side faces of the adjacent inner tegument (31), the front seat (324) and the rear seat (325) are respectively fixed on two ends of the connecting rod (323), the rear seat (325) of the previous connecting rod (323) is movably connected with the front seat (324) of the next connecting rod (323) through a pin shaft, and the front seat (324) and the rear seat (325) of the two connecting rods (323) positioned at the outermost sides are respectively fixed on the first rotating disk (321) and the second rotating disk (322);

the anti-vibration device comprises four anti-vibration assemblies (4) which are arranged in a group, wherein each group of anti-vibration assemblies (4) is arranged in a single inner layer (31) at equal intervals, each anti-vibration assembly (4) comprises an outer ring (41), an inner ring (42), a limiting ring (43), a center block (44), a main shaft (45), an outer sleeve (46), an inner sleeve (47) and a spring (48), the outer ring (41) is fixed on the inner wall of the inner layer (31), the limiting rings (43) are distributed on the inner circumferential surface of the outer ring (41) at equal intervals, and a ring of annular groove (431) is machined on the inner circumferential surface of each limiting ring (43);

a circle of baffle rings (441) are fixed on the peripheral surface of the central block (44), the central block (44) is inserted into the limiting ring (43), the baffle rings (441) are inserted into the ring grooves (431), the central block (44) rotates around the limiting ring (43), a vertical main shaft (45) is fixed on one side of the central block (44), the central block (44) is of a circular structure, and the main shaft (45) is located at the position, deviating from the circle center, of the central block (44);

the inner ring (42) is sleeved on the outer wall of the inner waterproof layer (52), pin bosses (411) are fixed on the outer wall of the inner ring (42) opposite to the outer ring (41), the pin bosses (411) correspond to the limiting rings (43) one by one, the pin bosses (411) are connected with the outer sleeve (46), the spring (48) is arranged in the outer sleeve (46), and one end of the spring (48) is fixed with the inner wall of the outer sleeve (46);

the main shaft (45) is sleeved with a rotary inner sleeve (47), and the inner sleeve (47) is inserted into the outer sleeve (46) and connected with the other end of the spring (48).

2. The flame-retardant fire-resistant power cable resistant to spray vibration as recited in claim 1, wherein the shortest distance between adjacent inner layers (31) is not less than 5cm, and the inner layers (31) are formed by winding a plurality of layers of alkali-free glass ribbons impregnated with flame retardant.

3. The flame-retardant fire-resistant power cable with shower vibration resistance as recited in claim 2, wherein the first rotating disk (321) and the second rotating disk (322) have a T-shaped cross section, a T-shaped groove for inserting the first rotating disk (321) and the second rotating disk (322) is formed on the inner coating layer (31), and the first rotating disk (321) and the second rotating disk (322) rotate in the T-shaped groove.

4. A spray vibration resistant flame retardant fire resistant power cable according to claim 3 wherein the inner (42) and outer (41) rings are concentric in an un-vibrated state, and wherein the inner ring (42) moves within the outer ring (41) through the vibration isolation assembly (4) during vibration to absorb kinetic energy generated by the vibration.