Fireproof power cable

Abstract

The utility model discloses a fireproof power cable, which comprises a plurality of cable core units, a protection assembly, an outer insulation layer, a buffer layer, a fireproof layer and an outer protection layer, the buffer layer is provided with an installation groove, a tensile metal strip is installed in the installation groove, the protection assembly comprises an inner protection piece, an outer protection piece and a flame-retardant strip, the inner protection piece is provided with a groove, and the outer protection piece is provided with an outer insulation layer. The cable core units are installed in the grooves, the outer protection pieces are arranged between every two adjacent cable core units and located between the inner protection pieces and the outer insulating layer, and the flame-retardant strips are arranged between the cable core units and the outer insulating layer and located between every two adjacent outer protection pieces. According to the cable, the cable core units can be limited through the cooperation of the inner protection pieces and the outer protection pieces, the internal stability of the cable can be further guaranteed, the flame-retardant strips are arranged between every two adjacent outer protection pieces, the fire resistance of the cable can be further improved, in addition, the tensile metal strips are installed in the installation grooves, and the tensile metal strips are not prone to deformation. Therefore, the tensile property of the cable can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable technical field, in particular, relate to a fire -resistant power cable. BACKGROUND

[0002] Power cable is an important component in power transmission and distribution system, its main function is to transmit electric energy from power plant, transformer substation and other power supply point to load point, to ensure the stable operation of power system. With the continuous development of power system, the transmission capacity, voltage grade and laying mode of power cable are also changing. In the power line, the proportion of cable is gradually increasing, so various performance types of power cable are produced, especially fire -resistant power cable, as the outgoing line, not only the fire -resistant performance is good, but also has strong mechanical properties.

[0003] In the prior art, the public number CN115083680A of Chinese patent discloses a kind of anti-tensile fire -resistant power cable, it includes copper conductor, the copper conductor is wrapped with fire -resistant layer, the fire -resistant layer is coated with insulation layer, multiple insulation layers are wrapped with tape, the tape is filled with filler between insulation layer, the tape is coated with inner sheath, the inner sheath is coated with steel wire armoring layer, the steel wire armoring layer is protected with outer sheath. However, the outer sheath of cable simply uses polyethylene or polyvinyl chloride and other materials, therefore, the tensile capacity of outer sheath is limited, easy to be pulled and deformed even broken, and the above structure uses single fire -resistant layer structure, and fire -resistant time is limited. UTILITY MODEL CONTENT

[0004] Therefore, it is necessary to provide a kind of power cable for improving the tensile and fire -resistant capacity of cable.

[0005] The utility model solves the technical scheme that it adopts to the technical scheme of the utility model: a kind of fire -resistant power cable, the fire -resistant power cable includes multiple cable core units, the protection assembly for fixing the cable core unit, the outer insulation layer wrapped in the protection assembly outside, the buffer layer being arranged at the outer insulation layer outside, the fire -resistant layer being arranged at the buffer layer outside and the outer sheath wrapped in the fire -resistant layer, mounting groove is set up on the buffer layer, tensile metal strip is installed in the mounting groove, the protection assembly includes inner guard piece, outer guard piece and flame -retardant strip, recess is set up on the inner guard piece, the cable core unit is installed in the recess, the outer guard piece is arranged between two adjacent cable core units, and the outer guard piece is located between the inner guard piece and the outer insulation layer, the flame -retardant strip is arranged between the cable core unit and the outer insulation layer, and the flame -retardant strip is located between two adjacent outer guard pieces.

[0006] Further, recess is set up on the inner guard piece, and insert plate is protruded on the outer guard piece, and the insert plate is matched with the recess.

[0007] Further, the mounting grooves are multiple, and the multiple mounting grooves are arranged at equal intervals along the circumferential direction of the buffer layer.

[0008] Further, the cable core unit comprises a cable core and an inner insulation layer, and the inner insulation layer is wrapped outside the cable core.

[0009] Further, a shielding layer and an oxygen barrier layer are further arranged between the outer insulation layer and the buffer layer, the shielding layer is wrapped outside the outer insulation layer, the oxygen barrier layer is wrapped outside the shielding layer, and the buffer layer is wrapped outside the oxygen barrier layer.

[0010] Further, a waterproof layer is further arranged between the buffer layer and the fire-resistant layer, the waterproof layer is wrapped outside the buffer layer, and the fire-resistant layer is wrapped outside the waterproof layer.

[0011] Further, the cable core unit has six.

[0012] Further, the tensile metal strip is made of tungsten material.

[0013] Further, the fire-resistant layer is made of low-smoke halogen-free flame-retardant polyolefin material.

[0014] The fire-resistant power cable has the advantages that: the inner protection piece and the outer protection piece are matched, so that the cable core unit is limited and the outer protection piece has certain buffering performance, the internal stability of the cable is further ensured, the flame-retardant strip is arranged between the two adjacent outer protection pieces, the fire resistance of the cable is further improved, the cable core unit is comprehensively protected, the service life of the cable core unit is prolonged, the tensile metal strip is arranged in the mounting groove, and the tensile performance of the cable is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model makes further explanation in connection with the drawings and examples.

[0016] Figure 1 It is the structure schematic diagram of the fire-resistant power cable of the utility model;

[0017] Figure 2 It is Figure 1 It is the partial close-up view of A in the fire-resistant power cable shown in the figure.

[0018] The names and numbers of the components in the figure are as follows: 1, cable core unit; 11, cable core; 12, inner insulation layer; 2, protection assembly; 21, inner protection piece; 211, insertion slot; 22, outer protection piece; 221, insertion plate; 23, fire-retardant strip; 3, outer insulation layer; 4, shielding layer; 5, oxygen barrier layer; 6, buffer layer; 60, mounting groove; 61, tensile metal strip; 7, waterproof layer; 8, fire-resistant layer; 9, outer protective layer. DETAILED DESCRIPTION

[0019] The utility model will be explained in detail in combination with the drawings. The figure is a simplified schematic diagram, and only the basic structure of the utility model is schematically shown, so it only shows the structure related to the utility model.

[0020] Please refer to Figure 1 and Figure 2 The utility model provides a kind of fire-resistant power cable, it includes cable core unit 1, protection assembly 2, outer insulation layer 3, buffer layer 6, fire-resistant layer 8 and outer protective layer 9, cable core unit 1 has multiple, protection assembly 2 is used to fix multiple cable core unit 1, outer insulation layer 3 is wrapped in the outside of protection assembly 2, buffer layer 6 is arranged in the outside of outer insulation layer 3, fire-resistant layer 8 is arranged in the outside of buffer layer 6, outer protective layer 9 is wrapped in the outside of fire-resistant layer 8. Mounting groove 60 is opened on buffer layer 6, and tensile metal strip 61 is installed in mounting groove 60, fire-resistant layer 8 is arranged in the outside of buffer layer 6, and outer protective layer 9 is arranged in the outside of fire-resistant layer 8, so as to be able to protect fire-resistant layer 8.Further, mounting groove 60 has multiple, and multiple mounting grooves 60 are evenly and equidistantly arranged in buffer layer 6 along the circumference of buffer layer 6.

[0021] In the embodiment, buffer layer 6 adopts mineral wool buffer material, and mineral wool and its products have the advantages of light weight, durability, non-combustion, non-corrosion and not being damaged by insects, are excellent heat insulation and sound absorption materials, and are made of silicate melt, including slag wool, rock wool, glass wool and ceramic fiber, etc.Tensile metal strip 61 is made of tungsten material, and tungsten has strong tensile property, and at the same time, tungsten has the maximum hardness and the highest melting point in metal, so as to increase the tensile property of cable.Fire-resistant layer 8 is made of low-smoke halogen-free flame-retardant polyolefin material, and fire-resistant layer 8 can block fire, so that fire cannot burn to the inside of cable, thereby increasing the flame-retardant property of cable;Outer protective layer 9 is made of neoprene material, and neoprene has high strength, good durability, excellent wear resistance, fire resistance, light resistance, ozone resistance and atmospheric aging resistance, and good elasticity, impact and vibration resistance.

[0022] Cable core unit 1 includes cable core 11 and inner insulation layer 12, and cable core 11 is made of copper material, and inner insulation layer 12 is wrapped in the outside of cable core 11.In the embodiment, cable core unit 1 has six.

[0023] The protection assembly 2 comprises an inner protection piece 21, an outer protection piece 22 and a fire-retardant strip 23. The inner protection piece 21 is provided with a recess 211, and the cable core unit 1 is installed in the recess 211. The outer protection piece 22 is arranged between two adjacent cable core units 1 and is located between the inner protection piece 21 and the outer insulation layer 3, so as to limit the cable core unit 1. The fire-retardant strip 23 is arranged between the cable core unit 1 and the outer insulation layer 3 and is located between two adjacent outer protection pieces 22. In this embodiment, the inner protection piece 21 is made of low-smoke halogen-free flame-retardant polyolefin material, so as to improve the flame-retardant performance of the cable. The outer protection piece 22 has a certain buffering performance, which can further ensure the internal stability of the cable. The fire-retardant strip 23 is provided with fire-retardant particles, which can block the fire, so as to further improve the fire resistance of the cable, thereby protecting the cable core unit 1 in all aspects and prolonging the service life of the cable core unit 1.

[0024] Further, in order to prevent the outer protection piece 22 from being dislocated relative to the inner protection piece 21, the inner protection piece 21 is provided with a slot 211, and the outer protection piece 22 is provided with a plug plate 221. During installation, the plug plate 221 is inserted into the slot 211, so as to prevent the outer protection piece 22 from being dislocated relative to the inner protection piece 21, thereby fixing the outer protection piece 22 relative to the inner protection piece 21.

[0025] The shielding layer 4 is wrapped outside the outer insulation layer 3, the oxygen barrier layer 5 is wrapped outside the shielding layer 4, and the buffer layer 6 is wrapped outside the oxygen barrier layer 5. In this embodiment, the shielding layer 4 is made of aluminum material, which can effectively shield the electromagnetic field in the cable and prevent it from overflowing, thereby improving the power transmission efficiency. The oxygen barrier layer 5 is made of aluminum hydroxide material, which can prevent the cable from continuing to burn and avoid the secondary harm of toxic gas.

[0026] Further, the waterproof layer 7 is arranged between the buffer layer 6 and the fire-resistant layer 8. The waterproof layer 7 is wrapped outside the buffer layer 6, and the fire-resistant layer 8 is wrapped outside the waterproof layer 7. The waterproof layer 7 is formed by repeatedly winding paraffin cloth belts. The paraffin cloth belt is formed by dipping paraffin emulsifier on the surface of the cotton cloth. After the paraffin is emulsified, it becomes fine particles. Paraffin has strong hydrophobicity, thereby having good waterproof performance. Since the buffer layer 6 is made of mineral wool buffer material, the fine particles on the waterproof layer 7 will not be damaged, thereby not damaging the hydrophobic performance of the waterproof layer 7, thereby protecting the waterproof layer 7 and preventing the cable from aging, thereby prolonging the service life of the cable.

[0027] The fireproof power cable provided by the utility model can limit the cable core unit 1, the outer protecting piece 22 has certain buffering performance, the internal stability of the cable can be further ensured, the flame-retardant strip 23 is arranged between the two adjacent outer protecting pieces 22, the fireproof performance of the cable can be further improved, the cable core unit 1 can be protected in all aspects, the service life of the cable core unit 1 can be prolonged, in addition, the tensile metal strip 61 is arranged in the mounting groove 60, the tensile performance of the cable can be improved.

[0028] The above description is based on the ideal embodiment of the utility model, and the related personnel can make various changes and modifications without deviating from the scope of the utility model. The technical scope of the utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A fire resistant power cable, characterized by: The fireproof power cable comprises a plurality of cable core units, a protection assembly for fixing the cable core units, an outer insulation layer wrapped outside the protection assembly, a buffer layer arranged outside the outer insulation layer, a fireproof layer arranged outside the buffer layer, and an outer sheath layer wrapped outside the fireproof layer, the buffer layer is provided with mounting grooves, and a tensile metal strip is mounted in the mounting grooves.

2. The fire resistant power cable of claim 1, wherein: The inner protection piece is provided with insertion grooves, and the outer protection piece is provided with insertion plates.

3. The fire resistant power cable of claim 1, wherein: The mounting grooves are uniformly and equidistantly arranged along the circumferential direction of the buffer layer.

4. The fire resistant power cable of claim 1, wherein: The cable core unit comprises a cable core and an inner insulation layer, and the inner insulation layer is wrapped outside the cable core.

5. The fire resistant power cable of claim 1, wherein: The outer insulation layer, the buffer layer, the fireproof layer, and the outer sheath layer are sequentially arranged.

6. The fire resistant power cable of claim 1, wherein: The buffer layer and the fireproof layer are further provided with a waterproof layer, the waterproof layer is wrapped outside the buffer layer, and the fireproof layer is wrapped outside the waterproof layer.

7. The fire resistant power cable of claim 1, wherein: The cable core unit has six.

8. The fire resistant power cable of claim 1, wherein: The tensile metal strip is made of tungsten material.

9. The fire resistant power cable of claim 1, wherein: The fireproof layer is made of low-smoke halogen-free flame-retardant polyolefin material.

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