CN214847791U - Flame-retardant power cable - Google Patents

Abstract

The utility model discloses a flame-retardant power cable, which comprises a cable core, and a belting layer, an inner liner layer, a compression layer, a flame-retardant layer, an armor layer and a sheath layer which are sequentially coated outside the cable core; the cable core comprises a buffer core and three wire cores, three arc grooves are formed in the outer wall of the buffer core at intervals, pressure-resistant arc plates with arc openings facing outwards are arranged in the arc grooves respectively, the three wire cores are arranged in arc cavities of the three pressure-resistant arc plates respectively, filling layers are further arranged among the wire cores, the pressure-resistant arc plates and the belting layer, each wire core comprises a copper conductor, a crosslinked polyethylene insulating layer and a protective layer, the crosslinked polyethylene insulating layer and the protective layer are sequentially coated outside the copper conductor, and the buffer grooves are formed in the outer peripheral wall of the protective layer at intervals; the compression-resistant layer includes the round compression-resistant pipe that sets up at lining layer periphery interval and connects the connection arc board of two adjacent compression-resistant pipes, and two adjacent compression-resistant pipes still fill in the cavity that encloses with connection arc board, lining layer and fire-retardant layer has the fire retardant. The utility model discloses aim at solving current power cable's structural strength low, compressive property subalternation problem.

Description

Flame-retardant power cable

Technical Field

The utility model relates to a power cable technical field especially relates to a fire-retardant power cable.

Background

The power cable is used for transmitting and distributing electric energy, is commonly used for urban underground power grids, power station leading-out lines, power supply inside industrial and mining enterprises and power transmission lines under river-crossing seawater, and has a gradually increasing proportion in the power line. Power cables are cable products used in the trunk lines of power systems to transmit and distribute high power electrical energy, including various voltage classes, 1-500KV and above, and various insulated power cables.

In the prior art, the power cable is low in structural strength and still has defects in compression resistance, the phenomena of breakage and fracture of the power cable caused by external extrusion and pulling in the laying and working processes are rare, and the service life of the power cable is short.

To above technical problem, the utility model discloses a fire-retardant power cable, the utility model has the advantages of improve power cable's structural strength, improve power cable's compressive property, extension power cable's life.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a fire-retardant power cable to solve among the prior art power cable structural strength low, still exist not enoughly on compressive property, power cable often can appear damaged, cracked phenomenon because of receiving external extrusion and dragging at the in-process of laying and work, power cable's life technical problem such as lower, the utility model has the advantages of improve power cable's structural strength, improve power cable's compressive property, extension power cable's life.

The utility model discloses a following technical scheme realizes: the utility model discloses a flame-retardant power cable, which comprises a cable core, and a belting layer, an inner liner layer, a compression layer, a flame-retardant layer, an armor layer and a sheath layer which are sequentially coated outside the cable core; the cable core comprises a buffer core and three wire cores, three arc grooves are formed in the outer wall of the buffer core at intervals, compression-resistant arc plates with arc openings facing outwards are arranged in the arc grooves respectively, the three wire cores are arranged in arc cavities of the three compression-resistant arc plates respectively, filling layers are further arranged among the wire cores, the compression-resistant arc plates and the belting layers, each wire core comprises a copper conductor, and a crosslinked polyethylene insulating layer and a protective layer which sequentially cover the copper conductor, the protective layer and the buffer core are both made of TPU (thermoplastic polyurethane) elastomer materials, buffer grooves are formed in the outer peripheral wall of the protective layer at intervals, and convex edges are formed between every two adjacent buffer grooves; the resistance to compression layer includes the round resistance to compression pipe that inner liner periphery interval set up and connects the connection arc board of two adjacent resistance to compression pipes, and resistance to compression pipe, connection arc board all adopt the nylon materials to make with the resistance to compression arc board, and it has the fire retardant still to fill in two adjacent resistance to compression pipes and the cavity that is connected arc board, inner liner and fire-retardant layer and encloses.

Preferably, in order to improve the compression resistance of the power cable, the middle part of the buffer core is provided with a reinforced core, and the reinforced core is made of a nylon material.

Preferably, in order to improve the pressure resistance of the power cable, the periphery of the buffer core is further provided with a buffer hole, and the buffer hole is located between two adjacent pressure-resistant arc plates.

Preferably, in order to improve the effect of the compression-resistant buffering, the cross section of the compression-resistant pipe is elliptical, and the long axis of the compression-resistant pipe with the elliptical cross section is located in the radial direction of the cable core.

Preferably, in order to improve power cable's tensile property, the inside of filling layer is inlayed and is equipped with tensile core, and tensile core is located the both sides of sinle silk, and tensile core is aramid fiber rope.

Preferably, in order to improve the tightness of the internal structure of the power cable and the structural strength of the power cable, the wrapping tape layer is formed by wrapping alkali-free glass fiber tapes.

Preferably, in order to improve the flame retardant property of the power cable, the lining layer and the sheath layer are both made of flame retardant polyvinyl chloride materials.

Preferably, in order to improve the flame retardant performance of the power cable, the flame retardant layer is wrapped by a flame retardant tape.

Preferably, in order to improve the compression resistance of the power cable, the armor layer is formed by wrapping galvanized steel strips.

Preferably, in order to improve the tightness of the internal structure of the power cable and improve the structural strength of the power cable, the filling layer is filled with the dust-free rock wool flame-retardant filling rope.

The utility model has the advantages of it is following: in the utility model, a protective layer is arranged outside the crosslinked polyethylene insulating layer, buffer grooves are arranged at intervals on the peripheral wall of the protective layer, a convex edge is formed between two adjacent buffer grooves, a buffer core is arranged inside the cable core, the buffer core and the protective layer are both made of TPU elastomer materials, so that the external pressure is buffered through the buffer core and the protective layer, the buffer effect is further improved through the arrangement of buffer holes and buffer grooves, thereby the cable core inside the power cable is well protected, three arc grooves are arranged at intervals on the outer wall of the buffer core, arc-mouth-outward compression-resistant arc plates are respectively arranged in the arc grooves, a compression-resistant layer is arranged outside the inner liner, the compression-resistant layer comprises a circle of compression-resistant pipes arranged at intervals at the periphery of the inner liner and connecting arc plates for connecting two adjacent compression-resistant pipes, the cross section of the compression-resistant pipe is oval, and the long axis of the compression-resistant pipe with the oval cross section is positioned in the radial direction of the cable core, the resistance to compression pipe, connect the arc board and all adopt the nylon materials to make with the resistance to compression arc board, thereby pass through the resistance to compression pipe, connect the setting of arc board and resistance to compression arc board can be fine antagonism and the external pressure of buffering, thereby improve power cable inner structure's intensity, promote power cable's compressive property, and simultaneously, two adjacent resistance to compression pipes still fill the fire retardant with the cavity that is connected the arc board inner liner and fire-retardant layer and encloses, when the outside sheath structure on resistance to compression layer is damaged, the fire retardant can play the effect of putting out a fire, the tensile property of power cable has been promoted in the setting of tensile core in the filling layer.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a cross-sectional view of a buffer core;

figure 3 is a cross-sectional view of the core.

In the figure: 1. a cable core; 11. a buffer core; 111. an arc groove; 112. a reinforcing core; 113. a buffer hole; 12. a wire core; 121. a copper conductor; 122. a crosslinked polyethylene insulating layer; 123. a protective layer; 2. a belting layer; 3. an inner liner layer; 4. a pressure resistant layer; 41. a pressure resistant pipe; 42. connecting the arc plates; 5. a flame retardant layer; 6. an armor layer; 7. a sheath layer; 8. a compression-resistant arc plate; 9. a filling layer; 91. a tensile core; 10. a buffer tank; 100. a rib; 110. and (3) a flame retardant.

Detailed Description

The embodiments of the present invention will be described in detail below, and the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Example 1

Embodiment 1 discloses a flame-retardant power cable, which comprises a cable core 1, and a belting layer 2, an inner liner layer 3, a compression-resistant layer 4, a flame-retardant layer 5, an armor layer 6 and a sheath layer 7 which are sequentially coated outside the cable core 1, wherein the belting layer 2 is formed by wrapping alkali-free glass fiber tapes, the inner liner layer 3 and the sheath layer 7 are both made of flame-retardant polyvinyl chloride materials, the flame-retardant layer 5 is formed by wrapping flame-retardant tapes, and the armor layer 6 is formed by wrapping galvanized steel tapes;

as shown in fig. 1 and 2, the cable core 1 includes a buffer core 11 and three cable cores 12, three arc grooves 111 are arranged on the outer wall of the buffer core 11 at intervals, pressure-resistant arc plates 8 with arc openings facing outward are respectively arranged in the arc grooves 111, the three cable cores 12 are respectively arranged in arc cavities of the three pressure-resistant arc plates 8, a filling layer 9 is further arranged between the cable cores 12 and the pressure-resistant arc plates 8 as well as between the cable cores 12 and a wrapping layer 2, the filling layer 9 is filled with dust-free rock wool flame-retardant filling ropes, tensile cores 91 are embedded in the filling layer 9 and located on two sides of the cable cores 12, the tensile cores 91 are aramid fiber ropes, a reinforcing core 112 is arranged in the middle of the buffer core 11, the reinforcing core 112 is made of nylon material, buffer holes 113 are further arranged on the periphery of the buffer core 11, and the buffer holes 113 are located between two adjacent pressure-resistant arc plates 8; as shown in fig. 1 and 3, the wire core 12 includes a copper conductor 121, and a crosslinked polyethylene insulating layer 122 and a protective layer 123 sequentially covering the copper conductor 121, the protective layer 123 and the buffer core 11 are both made of TPU elastomer material, buffer slots 10 are arranged on the outer peripheral wall of the protective layer 123 at intervals, and a rib 100 is formed between two adjacent buffer slots 10;

as shown in fig. 1, the pressure-resistant layer 4 includes a circle of pressure-resistant pipe 41 arranged at an interval on the periphery of the lining layer 3 and a connection arc plate 42 connecting two adjacent pressure-resistant pipes 41, the pressure-resistant pipe 41, the connection arc plate 42 and the pressure-resistant arc plate 8 are all made of nylon material, the cavity enclosed by two adjacent pressure-resistant pipes 41 and the connection arc plate 42, the lining layer 3 and the flame-retardant layer 5 is filled with a flame retardant 110, the cross section of the pressure-resistant pipe 41 is oval, and the long axis of the pressure-resistant pipe 41 with the oval cross section is located in the radial direction of the cable core 1.

The principle of the utility model is as follows: in the utility model, the protective layer 123 is arranged outside the crosslinked polyethylene insulating layer 122, the buffer grooves 10 are arranged at intervals on the peripheral wall of the protective layer 123, the convex rib 100 is formed between two adjacent buffer grooves 10, the buffer core 11 is arranged inside the cable core 1, the buffer core 11 and the protective layer 123 are both made of TPU elastomer materials, so that the external pressure is buffered through the buffer core 11 and the protective layer 123, the buffer hole 113 and the buffer groove 10 are arranged to further improve the buffering effect, thereby the cable core inside the power cable is well protected, three arc grooves 111 are arranged at intervals on the outer wall of the buffer core 11, the arc grooves 111 are respectively provided with the anti-pressure arc plates 8 with outward arc mouths, the anti-pressure layer 4 is arranged outside the inner liner 3, the anti-pressure layer 4 comprises a circle of anti-pressure pipes 41 arranged at intervals on the periphery of the inner liner 3 and a connecting arc plate 42 connecting two adjacent anti-pressure pipes 41, the cross-section of resistance to compression pipe 41 is oval, and the cross-section is oval resistance to compression pipe 41's major axis and is located the radial direction of cable core 1, resistance to compression pipe 41, connect arc 42 and resistance to compression arc 8 and all adopt the nylon materials to make, thereby through resistance to compression pipe 41, connect the setting of arc 42 and resistance to compression arc 8 can be fine antagonism and the external pressure of buffering, thereby improve power cable inner structure's intensity, promote power cable's compressive property, and simultaneously, two adjacent resistance to compression pipes 41 and connection arc 42, still pack in the cavity that inner liner 3 and fire-retardant layer enclose has fire retardant 110, when resistance to compression layer 4's outside sheath structure is damaged, fire retardant 110 can play the effect of putting out a fire, tensile core 91's in the filling layer 9 setting has promoted power cable's tensile property.

Claims (10)

1. A flame-retardant power cable is characterized by comprising a cable core, and a belting layer, an inner liner layer, a compression resistant layer, a flame-retardant layer, an armor layer and a sheath layer which are sequentially coated outside the cable core;

the cable core comprises a buffer core and three wire cores, three arc grooves are formed in the outer wall of the buffer core at intervals, compression-resistant arc plates with outward arc openings are respectively arranged in the arc grooves, the three wire cores are respectively arranged in arc cavities of the three compression-resistant arc plates, a filling layer is further arranged among the wire cores, the compression-resistant arc plates and the belting layer, each wire core comprises a copper conductor, a crosslinked polyethylene insulating layer and a protective layer, the crosslinked polyethylene insulating layer and the protective layer sequentially wrap the outside of the copper conductor, the protective layer and the buffer core are both made of TPU (thermoplastic polyurethane) elastomer materials, buffer grooves are formed in the outer peripheral wall of the protective layer at intervals, and convex edges are formed between every two adjacent buffer grooves;

the compression resistant layer includes the round compression resistant pipe that inner liner periphery interval set up and connect adjacent two the connection arc board of compression resistant pipe, connection arc board with the compression resistant arc board all adopts the nylon materials to make, adjacent two the compression resistant pipe with connect arc board, inner liner and it has the fire retardant still to fill in the cavity that fire-retardant layer encloses.

2. The flame retardant power cable of claim 1, wherein a reinforcing core is disposed in the middle of the buffer core, and the reinforcing core is made of nylon material.

3. The flame retardant power cable of claim 1 wherein said buffer core is further provided with buffer holes at its periphery, said buffer holes being located between two adjacent said pressure-resistant arc plates.

4. A flame-retardant electric cable according to claim 1, wherein the pressure-resistant pipe has an elliptical cross-section, and the major axis of the pressure-resistant pipe having the elliptical cross-section is located in the radial direction of the core.

5. The flame-retardant power cable of claim 1, wherein tensile cores are embedded in the filling layer, the tensile cores are positioned on two sides of the wire core, and the tensile cores are aramid fiber ropes.

6. A fire retardant power cable according to claim 1, wherein said tape layer is wrapped with alkali free glass fiber tape.

7. The flame-retardant power cable according to claim 1, wherein the inner liner layer and the sheath layer are made of flame-retardant polyvinyl chloride material.

8. A fire retardant power cable according to claim 1, wherein said fire retardant layer is wrapped with a fire retardant tape.

9. A fire retardant power cable according to claim 1, wherein said armour layer is wrapped with a galvanized steel tape.

10. A fire retardant power cable in accordance with claim 1, wherein said filler layer is filled with a fire retardant filler rope of non-dusting rock wool.

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