CN209822364U

CN209822364U - Fireproof medium-voltage cable

Info

Publication number: CN209822364U
Application number: CN201920242387.XU
Authority: CN
Inventors: 尚红旗; 杨冲; 周磊; 郭振杰
Original assignee: Hubei Baoshang Cable Co Ltd
Current assignee: Hubei Baoshang Cable Co Ltd
Priority date: 2019-02-26
Filing date: 2019-02-26
Publication date: 2019-12-20
Anticipated expiration: 2029-02-26

Abstract

The utility model provides a fire prevention medium voltage cable, includes insulating sinle silk, insulating sinle silk is equipped with a plurality ofly, goes out to pack at the clearance of adjacent insulating sinle silk and has the packing skeleton, the outside cladding of insulating sinle silk and packing skeleton has the flame retardant coating, the outside cladding of flame retardant coating has the band layer, the outside on band layer is equipped with the sheath. The utility model provides a pair of fire prevention medium voltage cable, every wire include by interior and the conductor, conductor shielding layer, insulating layer, insulation shielding layer, branch shielding layer that arrange in proper order outward, many wires transposition, the isolation cover cladding is outside at many wires, and the cladding of inorganic mineral filler material is at the outside cable core that has circular cross section that forms of isolation cover, wraps covering, flame retardant coating, restrictive coating cladding in proper order the cladding outside the cable core.

Description

Fireproof medium-voltage cable

Technical Field

The utility model belongs to the technical field of the fireproof cable technique and specifically relates to a fire prevention medium voltage cable.

Background

With the development of times and technological progress, the cable in the prior art cannot meet the requirement of the development of the modernization process, for example, the requirement of multi-core large-length cables in places such as skyscrapers, tunnels, airports and the like is increasing day by day, the places all require long fire-resistant time of the cable, the cable is produced by the original old process, the main idea is how to prevent fire of the fire cable, and under the condition of high temperature generated by fire, the existing cable is easily damaged, so that the great economic loss is caused, and the serious social influence is generated. Under the general condition, the cable or with the on-the-spot back of catching fire of cable, the cable is under the uniform temperature, probably short circuit or cable meet high temperature or self short circuit arouse the high temperature when, and cause the cable to catch fire, more even person, arouse bigger or, from this it is visible, except that insulating sinle silk (single core) of medium voltage cable or the stranding sinle silk outer (three-core) need set up the fire prevention isolation layer in order to reduce the temperature that insulating (XLPE) received, if can accomplish the cable short circuit and arouse high temperature or the cable position catches fire and can automatic alarm, and inform corresponding personnel, really accomplish self fire prevention, can compromise the fireproof cable who reports to the police again, it is to call for.

The current technology is mainly that refractory clay is extruded outside an insulating wire core (single core) or a cable wire core (three cores) of a medium-voltage cable, and the refractory clay can be sintered into porcelain at a certain flame temperature so as to isolate the flame temperature. However, this technique has a great problem, mainly including the following three points: 1. the medium-voltage cable has large outer diameter, the fire clay has no strength when being extruded by an extruder, the extrusion is very difficult, the thickness deviation of the fire-proof layer is very large, and the requirements of uniform thickness at the periphery and certain thickness (not less than 10mm) are difficult to achieve. 2. The intensity of the fire clay is poor in the sintering process, and the effect is different due to the blowing of the flame of a blast burner. 3. The cable only has a simple fire-resistant function after being on fire, and can not prompt and alarm when being on fire, and the early warning and the precaution are taken into consideration. Therefore, the medium-voltage fire-resistant cable in the prior art has various defects which cannot be called as 'fire-proof', and the fire-proof performance needs to be the coexistence of early warning and fire resistance.

Disclosure of Invention

The utility model aims to solve the technical problem that a fire prevention medium voltage cable is provided, the fire behavior of cable is improved.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: the utility model provides a fire prevention medium voltage cable, includes insulating sinle silk, insulating sinle silk is equipped with a plurality ofly, goes out to pack at the clearance of adjacent insulating sinle silk and has the packing skeleton, the outside cladding of insulating sinle silk and packing skeleton has the flame retardant coating, the outside cladding of flame retardant coating has the band layer, the outside on band layer is equipped with the sheath.

Preferably, one side of the filling framework is matched with the insulating wire core, the other side of the filling framework is connected with the fire-resistant layer, the side, in contact with the fire-resistant layer, of the filling framework is of an arc-shaped structure, and the arc-shaped structure is provided with a sawtooth-shaped groove.

Preferably, the filling framework is made of low-smoke halogen-free polyolefin material. The low-smoke halogen-free polyolefin material is halogen-free and generates less smoke when on fire.

Preferably, the refractory layer is refractory mortar.

Preferably, the insulated wire core comprises a conductor, an inner shielding layer is coated outside the conductor, an insulating layer is coated outside the inner shielding layer, and an outer shielding layer is coated outside the insulating layer. The insulating layer is made of a chemical crosslinking insulating material.

Preferably, the conductor includes a circular conductor, a first sector conductor provided outside the circular conductor, and a second sector conductor provided outside the first sector conductor.

Preferably, the number of the insulated wire cores is three.

Preferably, a temperature measuring optical fiber is arranged in the filling framework, and an optical fiber sheath is arranged outside the temperature measuring optical fiber.

Preferably, the outer side of the outer shielding layer is also provided with a copper strip shielding layer, and a polyethylene layer is arranged outside the copper strip shielding layer.

The utility model provides a pair of fire prevention medium voltage cable, every wire include by interior and the conductor, conductor shielding layer, insulating layer, insulation shielding layer, branch shielding layer that arrange in proper order outward, many wires transposition, the isolation cover cladding is outside at many wires, and the cladding of inorganic mineral filler material is at the outside cable core that has circular cross section that forms of isolation cover, wraps covering, flame retardant coating, restrictive coating cladding in proper order the cladding outside the cable core. Through the intelligent medium-high voltage fireproof cable with the optimized design, the structural design is reasonable, the fireproof effect is good, the cable core electric field is uniformly distributed, the shielding performance is greatly improved through multi-layer shielding, and the branch shielding layer can bear a loop cable when a system fails, so that the reliability of power transmission is ensured.

Drawings

The invention will be further explained with reference to the following figures and examples:

fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural view of the insulated wire core of the present invention;

fig. 3 is a schematic structural view of the filling framework of the present invention.

Detailed Description

As shown in fig. 1-3, a fireproof medium voltage cable includes a plurality of insulated wire cores 1, the insulated wire cores 1 are provided with a plurality of gaps, a filling framework 2 is filled in the gaps between the adjacent insulated wire cores 1, the outer sides of the insulated wire cores 1 and the filling framework 2 are wrapped with a fire-resistant layer 3, the fire-resistant layer 3 is wrapped with a belting layer 4, and the belting layer 4 is provided with a sheath 5. The filling framework 2 has a fireproof effect, and the fireproof temperature can reach 300 ℃; meanwhile, the thickness of the fire clay can be increased, the roundness of the cable is guaranteed, the distance between the fire clay and the insulated wire core is reduced, and the corrosion effect of the fire clay on the cable in the long-term operation of the cable is prevented.

Preferably, one side of the filling framework 2 is matched with the insulating wire core 1, the other side of the filling framework is connected with the fire-resistant layer 3, one side of the filling framework 2, which is contacted with the fire-resistant layer 3, is of an arc-shaped structure, and the arc-shaped structure is provided with a sawtooth-shaped groove. Set up the cockscomb structure recess, the first roundness of having guaranteed the cable, the second has increased the height and the shaping degree of chamotte, improves crowded mud speed.

Preferably, the filling framework 2 is made of low-smoke halogen-free polyolefin material. The low-smoke halogen-free polyolefin material is halogen-free and generates less smoke when on fire.

Preferably, the refractory layer 3 is refractory mortar, including high alumina ash.

Preferably, the insulated wire core 1 comprises a conductor, an inner shielding layer 6 is coated outside the conductor, an insulating layer 7 is coated outside the inner shielding layer 6, and an outer shielding layer 8 is coated outside the insulating layer 7. The insulating layer 7 is made of a chemical crosslinking insulating material.

Preferably, the conductor includes a circular conductor 9, a first sector conductor 10 disposed outside the circular conductor 9, and a second sector conductor 11 disposed outside the first sector conductor. By adopting the structure, the conductor is more compact, the cross-sectional area is small and the outer diameter is small under the condition of meeting the standard requirement of the conductor, so that the outer diameter of the whole cable is reduced by 2-4 mm.

Preferably, the number of the insulated wire cores 1 is three.

Preferably, a temperature measuring optical fiber 12 is arranged in the filling framework 2, and an optical fiber sheath 13 is arranged outside the temperature measuring optical fiber 12. The temperature measurement optical fiber is arranged in the filling framework, the filling framework is not easy to be damaged, the optical fiber can be protected, and the temperature measurement optical fiber is not easy to be influenced by corrosive materials such as refractory mortar.

Preferably, the outer side of the outer shielding layer 8 is also provided with a copper strip shielding layer 14, and a polyethylene layer 15 is arranged outside the copper strip shielding layer 14. The polyethylene layer plays a role in protecting the copper strip shielding layer and prevents the copper strip shielding layer from being influenced by corrosion of external environments such as fire clay and the like in long-term operation.

The utility model discloses every wire includes by interior and outer conductor, conductor shielding layer, insulating layer, insulation shielding layer, branch shielding layer of arranging in proper order, many wire transposition, and the spacer cover cladding is outside at many wires, and the cladding of inorganic mineral filler material is outside to form the cable core that has circular cross section at the spacer cover, wraps covering, flame retardant coating, restrictive coating and wraps the cable core outside in proper order. Through the medium-high voltage fireproof cable with the optimized design, the structural design is reasonable, the fireproof effect is good, the cable core electric field is uniformly distributed, the shielding performance is greatly improved through multi-layer shielding, and the branch shielding layer can bear a loop cable when a system fails, so that the reliability of power transmission is ensured.

The above-mentioned embodiments are merely preferred embodiments of the present invention, and should not be considered as limitations of the present invention, and the protection scope of the present invention should be defined by the technical solutions described in the claims, and includes equivalent alternatives of technical features in the technical solutions described in the claims. Namely, equivalent alterations and modifications within the scope of the invention are also within the scope of the invention.

Claims

1. A fireproof medium voltage cable, characterized in that: including insulating sinle silk (1), insulating sinle silk (1) are equipped with a plurality ofly, go out to pack in the clearance of adjacent insulating sinle silk (1) and have packing skeleton (2), the outside cladding of insulating sinle silk (1) and packing skeleton (2) has flame retardant coating (3), the outside cladding of flame retardant coating (3) has band layer (4), the outside of band layer (4) is equipped with sheath (5).

2. A fire-resistant medium voltage cable according to claim 1, characterized in that: one side of the filling framework (2) is matched with the insulating wire core (1), the other side of the filling framework is connected with the fire-resistant layer (3), one side of the filling framework (2) which is contacted with the fire-resistant layer (3) is of an arc structure, and a sawtooth-shaped groove is formed in the arc structure.

3. A fire-resistant medium voltage cable according to claim 1, characterized in that: the filling framework (2) is made of low-smoke halogen-free polyolefin material.

4. A fire-resistant medium voltage cable according to claim 1, characterized in that: the fire-resistant layer (3) is made of fire-resistant clay.

5. A fire-resistant medium voltage cable according to claim 1, characterized in that: the insulated wire core (1) comprises a conductor, wherein an inner shielding layer (6) is coated outside the conductor, an insulating layer (7) is coated outside the inner shielding layer (6), and an outer shielding layer (8) is coated outside the insulating layer (7).

6. A fire-resistant medium voltage cable according to claim 5, characterized in that: the conductor comprises a circular conductor (9), a first sector conductor (10) arranged on the outer side of the circular conductor (9) and a second sector conductor (11) arranged on the outer side of the first sector conductor.

7. A fire-resistant medium voltage cable according to claim 1, characterized in that: the number of the insulated wire cores (1) is three.

8. A fire-resistant medium voltage cable according to claim 1, characterized in that: the filling framework (2) is internally provided with a temperature measuring optical fiber (12), and the outside of the temperature measuring optical fiber (12) is provided with an optical fiber sheath (13).

9. A fire-resistant medium voltage cable according to claim 5, characterized in that: the outer side of the outer shielding layer (8) is also provided with a copper strip shielding layer (14), and a polyethylene layer (15) is arranged outside the copper strip shielding layer (14).