CN205028678U - Medium voltage fireproof cable - Google Patents

Abstract

The utility model discloses a medium-voltage fire-resistant cable, which belongs to the technical field of cables. The shielding layer is characterized in that: the insulating layer is a cross-linked polyethylene insulating layer, the shielding layer is wrapped with a copper tape wrapping shielding layer, and the copper tape wrapping shielding layer is wrapped with a glass fiber flame-retardant layer, The glass fiber flame-retardant layer is wrapped with a ceramic fiber heat insulation layer, the ceramic fiber heat insulation layer is wrapped with a ceramicized silicone rubber layer, and the ceramicized silicone rubber layer is wrapped with a steel tape armor layer. The steel tape armor layer is wrapped with an outer sheath. The cable of the utility model has good fire resistance as a whole, can keep energized for 90 minutes under burning conditions, and meets the environmental requirements of low smoke and halogen-free when burning, and also has the characteristics of high overall structural strength and strong tensile resistance.

Description

A medium-voltage fire-resistant cable

technical field

The utility model relates to the technical field of cables, in particular to a medium-voltage fire-resistant cable.

Background technique

There are many types of cables, all of which have special structures and properties according to different uses and work requirements. Cables are mainly divided into power cables, control cables, compensation cables, shielded cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, aluminum alloy cables, etc.

Among them, power cables are more common. Power cables are mainly used for the transmission of strong electric energy in the transmission, distribution, transmission, transformation, and power supply lines, with large currents and high voltages. The processing technology is also relatively simple, starting from the conductor processing, it is made by adding insulation, shielding, cabling and sheath layer by layer on the periphery of the conductor. The more complex the structure of the power cable, the more layers are superimposed.

In addition, there are many applications of fire-resistant cables. Fire-resistant cables refer to cables that can maintain safe operation for a certain period of time under the condition of flame burning. Fire-resistant cables are divided into Class A and Class B: Class B cables can withstand burning for at least 90 minutes in a flame of 750-800 degrees Celsius and at rated voltage without cable breakdown. On the basis of improving the manufacturing process of the refractory layer and adding the refractory layer, a class A refractory cable has emerged, which can withstand burning for at least 90 minutes in a flame of 950-1000 degrees Celsius and at rated voltage without the cable being broken down. The fire resistance of class A fire-resistant cables is better than that of class B, but the price is also more expensive. Fire-resistant cables are widely used in high-rise buildings, underground railways, underground streets, large power stations, important industrial and mining enterprises and other places related to fire safety and fire-fighting and lifesaving, such as power supply lines and control lines of emergency facilities such as fire-fighting equipment and emergency guide lights.

The publication number is CN203480897U, and the Chinese patent literature published on March 12, 2014 discloses a square fireproof cable, which is characterized in that: it includes a conductor composed of several nickel-plated copper wires twisted into bundles and covered with an insulating layer. Each of the six conductors is wrapped with a reinforcing core bundle and twisted into a bundle to form a wire core, and each of the two wire cores is bundled by adhesive tapes side by side to form a conductor group, and the three conductor groups are arranged vertically to form a cable core. The cable core is extruded with a silicone rubber inner sheath layer. The outer side of the silicone rubber inner sheath layer is provided with a semi-conductive rubber shielding layer, a polyester silk braid layer and a fireproof outer sheath layer. The four corners of the fireproof outer sheath layer A metal wear-resistant layer is provided. Although the fireproof cable disclosed in this patent document has good overall wear resistance, it has poor flexibility and low overall tensile strength.

Utility model content

In order to solve the above technical problems, the utility model proposes a medium-voltage fire-resistant cable. In the utility model, the cable as a whole has good fire resistance and flexibility, and the overall structural strength is high and the tensile capacity is strong.

The technical scheme that the utility model adopts is:

A medium-voltage fire-resistant cable, which sequentially includes a wire core, an insulating layer wrapping the wire core, and an insulating shielding layer wrapping the insulating layer from the inside to the outside, the wire core includes a conductor and a semi-conductive shielding layer wrapping the conductor, and is characterized in that: The insulating layer is a cross-linked polyethylene insulating layer, and the insulating shielding layer is wrapped with a copper tape wrapping shielding layer, and the copper tape wrapping shielding layer is wrapped with a glass fiber flame-retardant layer, and the glass fiber flame-retardant layer is wrapped Wrapped with a ceramic fiber heat insulation layer, the ceramic fiber heat insulation layer is wrapped with a ceramic silicon rubber layer, the ceramic silicon rubber layer is wrapped with a steel tape armor layer, and the steel tape armor layer is wrapped with outer sheath.

The conductors are stranded copper conductors.

The wire cores are single or multiple.

The arrangement of the multiple wire cores is single-layer or multi-layer concentric twisting.

The voids of the plurality of wire cores are filled with an alkali-free glass fiber yarn filling layer.

The outer sheath is a low-smoke halogen-free outer sheath.

The outer sheath is wrapped with a stainless steel wire mesh covering layer in a braided mesh structure.

The cross-linked polyethylene described in the utility model is a net-like three-dimensional structure formed by cross-linking polyethylene through covalent bonds between polyethylene molecules; it has good insulation and heat resistance.

The beneficial effects of the utility model are mainly manifested in the following aspects:

1. In this utility model, the insulating layer is a cross-linked polyethylene insulating layer, which has good insulation and heat resistance; the insulating shielding layer is wrapped with a copper tape wrapping shielding layer, which has a good shielding effect; the copper tape wrapping shielding The layer is wrapped with a glass fiber flame retardant layer, glass fiber, which has good flame retardant effect and high temperature resistance, can form a three-dimensional network structure, improves the toughness and tensile properties of the entire cable, and has high impact strength; glass fiber resistance The combustion layer is wrapped with a ceramic fiber heat insulation layer. The ceramic fiber heat insulation layer has good heat insulation performance and can withstand high temperatures of 800-1400 degrees Celsius; it can effectively isolate and slow down the temperature of the insulation layer of the cable core during combustion, ensuring that the insulation layer is at The temperature is lower than 200 degrees Celsius within a certain period of time; the ceramic fiber insulation layer is wrapped with a ceramic silicon rubber layer. The ceramic silicon rubber layer itself has excellent electrical insulation performance, good softness and elasticity, and can prevent the core from being damp. After ablation, it is transformed into a ceramic-like shell, forming a hard protective layer. The protective layer is a loose porous crust, which can effectively prevent heat transfer, isolate external flames, and have good protection for the wire core. Function; the ceramic silicone rubber layer is wrapped with a steel tape armor layer, the steel tape armor layer can obviously block and cut off the flame, effectively prevent the flame from directly contacting the insulating layer, and is conducive to enhancing the overall structural strength of the cable; the steel tape armor layer Wrapped with an outer sheath, which can effectively improve the wear resistance of the cable; as a complete technical solution, the cable as a whole has good fire resistance and flexibility, and can keep energized for 90 minutes under burning conditions. The overall structural strength is high, and the tensile capacity powerful.

2. In the utility model, the conductor is a stranded copper conductor, which not only has high conductivity, but also has good ductility and strong plasticity.

3. In the utility model, the wire core is single or multiple, and can be made into a single-core cable, a three-core cable, etc. according to different requirements, and the production is simple.

4. In the present utility model, the arrangement of multiple wire cores is multi-layer concentric twisting. Adopting this specific arrangement greatly enhances the structural stability and flexibility of the cable, and the cable has better tensile strength.

5. In this utility model, the gaps of multiple wire cores are filled with non-alkali glass fiber yarn filling layer, and the non-alkali glass fiber yarn is a longitudinally parallel beam structure, which has good heat resistance and thermal radial dredging characteristics, and can effectively Reduce insulation temperature and have higher tensile strength.

6. In this utility model, the outer sheath is a low-smoke and halogen-free outer sheath, which will not emit toxic and harmful gases when burning, and has good environmental protection.

7. In the utility model, the outer sheath is wrapped with a stainless steel wire mesh cladding layer in a woven mesh structure, and the stainless steel wire mesh cladding layer further improves the overall structural strength of the cable.

Description of drawings

The utility model will be further specifically described below in conjunction with the accompanying drawings and specific embodiments, wherein:

Fig. 1 is the sectional structure schematic diagram of the present utility model;

Fig. 2 is the sectional structure schematic diagram of the utility model embodiment 5;

Fig. 3 is the sectional structure schematic diagram of the utility model embodiment 7;

Marks in the figure: 1. Insulation layer, 2. Insulation shielding layer, 3. Conductor, 4. Semi-conductive shielding layer, 5. Copper tape wrapping shielding layer, 6. Glass fiber flame retardant layer, 7. Ceramic fiber heat insulation layer , 8, ceramic silicone rubber layer, 9, steel tape armor layer, 10, outer sheath, 11, E-glass fiber yarn filling layer, 12, stainless steel wire mesh coating.

detailed description

Example 1

Referring to Figure 1, a medium-voltage fire-resistant cable includes a core, an insulating layer 1 wrapping the core, an insulating shielding layer 2 wrapping the insulating layer 1 from the inside to the outside, and the core includes a conductor 3 and a semi-conductive layer wrapping the conductor 3. The shielding layer 4 is characterized in that: the insulating layer 1 is a cross-linked polyethylene insulating layer, the insulating shielding layer 2 is wrapped with a copper tape wrapping shielding layer 5, and the copper tape wrapping shielding layer 5 is wrapped with A glass fiber flame-retardant layer 6, the glass fiber flame-retardant layer 6 is wrapped with a ceramic fiber heat-insulating layer 7, and the ceramic fiber heat-insulation layer 7 is wrapped with a ceramicized silicone rubber layer 8, and the ceramicized silicone rubber layer 8 is wrapped with a steel tape armor layer 9, and the steel tape armor layer 9 is wrapped with an outer sheath 10.

This embodiment is the most basic implementation mode. The insulating layer is a cross-linked polyethylene insulating layer, which has good insulation and heat resistance; the insulating shielding layer is wrapped with a copper tape wrapping shielding layer, which has a good shielding effect; The wrapping shielding layer is wrapped with a glass fiber flame retardant layer, glass fiber, which has good flame retardant effect and high temperature resistance, can form a three-dimensional network structure, improves the toughness and tensile properties of the entire cable, and has high impact strength The glass fiber flame retardant layer is wrapped with a ceramic fiber heat insulation layer. The ceramic fiber heat insulation layer has good heat insulation performance and can withstand high temperatures of 800-1400 degrees Celsius; it can effectively isolate and slow down the insulation layer temperature of the cable core during combustion. Ensure that the temperature of the insulating layer is lower than 200 degrees Celsius within a certain period of time; the ceramic fiber insulation layer is wrapped with a ceramic silicone rubber layer. The ceramic silicone rubber layer itself has excellent electrical insulation performance, good softness and elasticity, and can prevent wires The core is damp and transformed into a ceramic-like shell after being ablated, forming a hard protective layer. The protective layer is a loose porous crust, which can effectively prevent heat transfer and play a role in isolating external flames. It has a good protective effect; the ceramic silicone rubber layer is wrapped with a steel tape armor layer, and the steel tape armor layer can obviously block and cut off the flame, effectively prevent the flame from directly contacting the insulating layer, and is conducive to enhancing the overall structural strength of the cable; the steel tape The armored layer is wrapped with an outer sheath, which can effectively improve the wear resistance of the cable; as a complete technical solution, the cable as a whole has good fire resistance and flexibility, and can keep energized for 90 minutes under burning conditions, and the overall structural strength is high , strong tensile capacity.

Example 2

Referring to Figure 1, a medium-voltage fire-resistant cable includes a core, an insulating layer 1 wrapping the core, an insulating shielding layer 2 wrapping the insulating layer 1 from the inside to the outside, and the core includes a conductor 3 and a semi-conductive layer wrapping the conductor 3. The shielding layer 4 is characterized in that: the insulating layer 1 is a cross-linked polyethylene insulating layer, the insulating shielding layer 2 is wrapped with a copper tape wrapping shielding layer 5, and the copper tape wrapping shielding layer 5 is wrapped with A glass fiber flame-retardant layer 6, the glass fiber flame-retardant layer 6 is wrapped with a ceramic fiber heat-insulating layer 7, and the ceramic fiber heat-insulation layer 7 is wrapped with a ceramicized silicone rubber layer 8, and the ceramicized silicone rubber layer 8 is wrapped with a steel tape armor layer 9, and the steel tape armor layer 9 is wrapped with an outer sheath 10.

The conductor 3 is a stranded copper conductor.

This embodiment is a preferred implementation mode. The conductor is a stranded copper conductor, which not only has high conductivity, but also has good ductility and strong plasticity.

Example 3

Referring to Figure 1, a medium-voltage fire-resistant cable includes a core, an insulating layer 1 wrapping the core, an insulating shielding layer 2 wrapping the insulating layer 1 from the inside to the outside, and the core includes a conductor 3 and a semi-conductive layer wrapping the conductor 3. The shielding layer 4 is characterized in that: the insulating layer 1 is a cross-linked polyethylene insulating layer, the insulating shielding layer 2 is wrapped with a copper tape wrapping shielding layer 5, and the copper tape wrapping shielding layer 5 is wrapped with A glass fiber flame-retardant layer 6, the glass fiber flame-retardant layer 6 is wrapped with a ceramic fiber heat-insulating layer 7, and the ceramic fiber heat-insulation layer 7 is wrapped with a ceramicized silicone rubber layer 8, and the ceramicized silicone rubber layer 8 is wrapped with a steel tape armor layer 9, and the steel tape armor layer 9 is wrapped with an outer sheath 10.

The conductor 3 is a stranded copper conductor.

The wire cores are single or multiple.

This embodiment is a preferred implementation mode, and the wire core is single or multiple, which can be made into single-core cables, three-core cables, etc. according to different requirements, and the production is simple.

Example 4

Referring to Figure 1, a medium-voltage fire-resistant cable includes a core, an insulating layer 1 wrapping the core, an insulating shielding layer 2 wrapping the insulating layer 1 from the inside to the outside, and the core includes a conductor 3 and a semi-conductive layer wrapping the conductor 3. The shielding layer 4 is characterized in that: the insulating layer 1 is a cross-linked polyethylene insulating layer, the insulating shielding layer 2 is wrapped with a copper tape wrapping shielding layer 5, and the copper tape wrapping shielding layer 5 is wrapped with A glass fiber flame-retardant layer 6, the glass fiber flame-retardant layer 6 is wrapped with a ceramic fiber heat-insulating layer 7, and the ceramic fiber heat-insulation layer 7 is wrapped with a ceramicized silicone rubber layer 8, and the ceramicized silicone rubber layer 8 is wrapped with a steel tape armor layer 9, and the steel tape armor layer 9 is wrapped with an outer sheath 10.

The conductor 3 is a stranded copper conductor.

The wire cores are single or multiple.

The arrangement of the multiple wire cores is single-layer or multi-layer concentric twisting.

This embodiment is a preferred implementation mode. The arrangement of multiple wire cores is multi-layer concentric twisting. Using this specific arrangement greatly enhances the structural stability and flexibility of the cable, and the tensile strength of the cable Ability is better.

Example 5

Referring to Figure 2, a medium-voltage fire-resistant cable includes a core, an insulating layer 1 wrapping the core, an insulating shielding layer 2 wrapping the insulating layer 1 from the inside to the outside, and the core includes a conductor 3 and a semi-conductive layer wrapping the conductor 3. The shielding layer 4 is characterized in that: the insulating layer 1 is a cross-linked polyethylene insulating layer, the insulating shielding layer 2 is wrapped with a copper tape wrapping shielding layer 5, and the copper tape wrapping shielding layer 5 is wrapped with A glass fiber flame-retardant layer 6, the glass fiber flame-retardant layer 6 is wrapped with a ceramic fiber heat-insulating layer 7, and the ceramic fiber heat-insulation layer 7 is wrapped with a ceramicized silicone rubber layer 8, and the ceramicized silicone rubber layer 8 is wrapped with a steel tape armor layer 9, and the steel tape armor layer 9 is wrapped with an outer sheath 10.

The conductor 3 is a stranded copper conductor.

The wire cores are single or multiple.

The arrangement of the multiple wire cores is single-layer or multi-layer concentric twisting.

The voids of the plurality of wire cores are filled with an alkali-free glass fiber yarn filling layer 11 .

This embodiment is a preferred implementation mode. The gaps of multiple wire cores are filled with non-alkali glass fiber yarn filling layer, and the non-alkali glass fiber yarn is a longitudinal parallel beam structure, which has good heat resistance and thermal radial flow. Features, can effectively reduce the temperature of the insulating layer, and has a high tensile strength.

Example 6

Referring to Figure 2, a medium-voltage fire-resistant cable includes a core, an insulating layer 1 wrapping the core, an insulating shielding layer 2 wrapping the insulating layer 1 from the inside to the outside, and the core includes a conductor 3 and a semi-conductive layer wrapping the conductor 3. The shielding layer 4 is characterized in that: the insulating layer 1 is a cross-linked polyethylene insulating layer, the insulating shielding layer 2 is wrapped with a copper tape wrapping shielding layer 5, and the copper tape wrapping shielding layer 5 is wrapped with A glass fiber flame-retardant layer 6, the glass fiber flame-retardant layer 6 is wrapped with a ceramic fiber heat-insulating layer 7, and the ceramic fiber heat-insulation layer 7 is wrapped with a ceramicized silicone rubber layer 8, and the ceramicized silicone rubber layer 8 is wrapped with a steel tape armor layer 9, and the steel tape armor layer 9 is wrapped with an outer sheath 10.

The conductor 3 is a stranded copper conductor.

The wire cores are single or multiple.

The arrangement of the multiple wire cores is single-layer or multi-layer concentric twisting.

The voids of the plurality of wire cores are filled with an alkali-free glass fiber yarn filling layer 11 .

The outer sheath 10 is a low-smoke halogen-free outer sheath.

This embodiment is a preferred implementation mode. The outer sheath is a low-smoke and halogen-free outer sheath, which will not emit toxic and harmful gases when burning, and has good environmental protection.

Example 7

Referring to Figure 3, a medium-voltage fire-resistant cable includes a core, an insulating layer 1 wrapping the core, an insulating shielding layer 2 wrapping the insulating layer 1 from the inside to the outside, and the core includes a conductor 3 and a semiconductive layer wrapping the conductor 3. The shielding layer 4 is characterized in that: the insulating layer 1 is a cross-linked polyethylene insulating layer, the insulating shielding layer 2 is wrapped with a copper tape wrapping shielding layer 5, and the copper tape wrapping shielding layer 5 is wrapped with A glass fiber flame-retardant layer 6, the glass fiber flame-retardant layer 6 is wrapped with a ceramic fiber heat-insulating layer 7, and the ceramic fiber heat-insulation layer 7 is wrapped with a ceramicized silicone rubber layer 8, and the ceramicized silicone rubber layer 8 is wrapped with a steel tape armor layer 9, and the steel tape armor layer 9 is wrapped with an outer sheath 10.

The conductor 3 is a stranded copper conductor.

The wire cores are single or multiple.

The arrangement of the multiple wire cores is single-layer or multi-layer concentric twisting.

The voids of the plurality of wire cores are filled with an alkali-free glass fiber yarn filling layer 11 .

The outer sheath 10 is a low-smoke halogen-free outer sheath.

The outer sheath 10 is wrapped with a stainless steel wire mesh cladding layer 12 in a braided mesh structure.

This embodiment is the best implementation mode. The insulating layer is a cross-linked polyethylene insulating layer, which has good insulation and heat resistance; the insulating shielding layer is wrapped with a copper tape wrapping shielding layer, which has a good shielding effect; the copper tape The wrapping shielding layer is wrapped with a glass fiber flame retardant layer, glass fiber, which has good flame retardant effect and high temperature resistance, can form a three-dimensional network structure, improves the toughness and tensile properties of the entire cable, and has high impact strength; The glass fiber flame retardant layer is wrapped with a ceramic fiber heat insulation layer. The ceramic fiber heat insulation layer has good heat insulation performance and can withstand high temperatures of 800-1400 degrees Celsius; it can effectively isolate and slow down the insulation layer temperature of the cable core during combustion, ensuring The temperature of the insulation layer is lower than 200 degrees Celsius within a certain period of time; the ceramic fiber insulation layer is wrapped with a ceramic silicon rubber layer. The ceramic silicon rubber layer itself has excellent electrical insulation performance, good softness and elasticity, and can prevent wire cores from Moisture, after being ablated, it will be transformed into a ceramic-like shell, forming a hard protective layer. The protective layer is a loose porous crust, which can effectively prevent heat transfer and play the role of isolating external flames. Good protective effect; the ceramic silicone rubber layer is wrapped with a steel tape armor layer, the steel tape armor layer can obviously block and cut off the flame, effectively prevent the flame from directly contacting the insulating layer, and is conducive to enhancing the overall structural strength of the cable; the steel tape armor The outer sheath is wrapped outside the coating layer, which can effectively improve the wear resistance of the cable; as a complete technical solution, the cable as a whole has good fire resistance and flexibility, and can keep energized for 90 minutes under burning conditions, and the overall structural strength is high. Strong tensile capacity. The outer sheath is wrapped with a stainless steel wire mesh covering layer in a woven mesh structure, and the stainless steel wire mesh covering layer further improves the overall structural strength of the cable.

Claims (7)

1. A medium-voltage fire-resistant cable, which includes a wire core, an insulating layer (1) wrapping the wire core, and an insulating shielding layer (2) wrapping the insulating layer (1) from the inside to the outside. The wire core includes a conductor (3) and The semi-conductive shielding layer (4) wrapping the conductor (3), characterized in that: the insulating layer (1) is a cross-linked polyethylene insulating layer, and the insulating shielding layer (2) is wrapped with a copper tape wrapping shielding layer (5), the copper tape wrapping shielding layer (5) is wrapped with a glass fiber flame retardant layer (6), and the glass fiber flame retardant layer (6) is wrapped with a ceramic fiber heat insulation layer (7), so The ceramic fiber heat insulation layer (7) is wrapped with a ceramicized silicone rubber layer (8), and the ceramicized silicone rubber layer (8) is wrapped with a steel tape armor layer (9), and the steel tape armor layer (9) is wrapped with an outer sheath (10). 2. A medium-voltage fire-resistant cable according to claim 1, characterized in that: the conductor (3) is a stranded copper conductor. 3. A medium-voltage fire-resistant cable according to claim 1, characterized in that: said cores are single or multiple. 4. A medium-voltage fire-resistant cable according to claim 1, characterized in that: the arrangement of the plurality of wire cores is single-layer or multi-layer concentric twisting. 5. A medium-voltage fire-resistant cable according to claim 1, characterized in that: the voids of the plurality of wire cores are filled with an alkali-free glass fiber yarn filling layer (11). 6. A medium-voltage fire-resistant cable according to claim 1, characterized in that: the outer sheath (10) is a low-smoke, halogen-free outer sheath. 7. A medium-voltage fire-resistant cable according to claim 1, characterized in that: the outer sheath (10) is wrapped with a stainless steel wire mesh covering layer (12) in a braided mesh structure.