A B1 grade waterproof and fireproof medium voltage cable

Abstract

The utility model relates to the field of cable technology. Aiming at the problem that the existing medium-voltage cables have weak waterproof performance and the fire resistance needs to be further improved, a B1-level waterproof and fireproof medium-voltage cable is provided, including a conductor assembly, the outer periphery of the conductor assembly is sequentially coated with an insulating waterproof layer, a waterproof and fire-resistant layer, and an outer sheath layer from the inside to the outside, and the outer sheath layer is made of B1-level flame-retardant, low-smoke, halogen-free polyolefin material. It also includes a fireproof bracket made of ceramic silicone rubber and having good fireproof and fire-resistant performance. The central column of the fireproof bracket is arranged at the central position in the insulating waterproof layer, and a plurality of partition plates are arranged at intervals around the central column, which can provide stable support and effectively separate the conductor assembly, insulate heat and fire, and extend the safe working time of the cable. This cable adopts multiple waterproof structures and multiple flame-retardant and fire-resistant structures, with good waterproof and fire-resistant performance. It can delay the spread of flames in case of fire, maintain stable operation, and buy a certain amount of rescue time for the firefighters.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a B1-level waterproof and fireproof medium-voltage cable. Background Art

[0002] Modern urbanization has led to larger and larger buildings, and the demand for electricity in buildings has continued to increase. 1kV low-voltage cables can no longer fully meet the transmission needs of electricity consumption. 10kV or 35kV medium-voltage cables are needed inside buildings to achieve high-power power transmission. In order to ensure the fire safety of cables crossing shopping malls, schools, rail transit and other relatively densely populated building areas, it is necessary to use medium-voltage cables with relatively high safety and combustion performance level of b1.

[0003] For example, the patent with announcement number CN212136028U provides a fireproof medium-voltage cable with a combustion performance level of B1, including an insulating core, a filling layer, a heat-insulating layer, a fire-proof layer and an outer sheath layer arranged in sequence from the inside to the outside; the insulating core includes a conductor, a composite insulation layer and a metal shielding layer arranged closely in sequence from the inside to the outside; the heat-insulating layer includes a first buffer zone, an extruded layer, a second buffer zone and a metal sheath layer wrapped in sequence from the inside to the outside; the fire-proof layer includes a ceramic material layer and an interlocking armor layer. By setting a heat-insulating layer and a fire-proof layer of a composite structure, the fireproof and heat-insulating performance and fire-proof performance of the medium-voltage cable are significantly improved. However, when a fire occurs, the medium-voltage cable faces complex environments such as flame burning, a sharp rise in temperature, and a sprinkler system spraying to extinguish the fire. The medium-voltage cable also has a weak waterproof performance, and the inside of the cable may be invaded by water, affecting the normal operation of the cable.

[0004] Therefore, there is an urgent need to provide a B1-level medium voltage cable with good waterproof and fireproof performance. Utility Model Content

[0005] The purpose of the utility model is to solve the problem that the existing medium-voltage cables have weak waterproof performance and need to further improve their fire resistance. The application provides a B1-level waterproof and fireproof medium-voltage cable, which can achieve the technical effect of good waterproof and fireproof performance, delay the spread of flames in the event of a fire, maintain stable operation, and buy a certain amount of rescue time for firefighters.

[0006] The utility model is achieved through the following technical solutions: a B1-level waterproof and fireproof medium-voltage cable, comprising a conductor assembly, the outer circumference of the conductor assembly is sequentially coated with an insulating waterproof layer, a waterproof and fire-resistant layer, and an outer sheath layer from the inside to the outside, and the outer sheath layer is made of B1-level flame-retardant low-smoke halogen-free polyolefin material; it also includes a fireproof bracket, the fireproof bracket includes a central column and a plurality of partition plates, the central column is arranged at a central position in the insulating waterproof layer, a plurality of the partition plates are spaced around the central column, one end of the plurality of partition plates are detachably connected to the outer wall surface of the central column, and the other end of the plurality of partition plates are detachably connected to the inner wall surface of the insulating waterproof layer, and the central column and the plurality of partition plates are made of ceramic silicone rubber.

[0007] Preferably, alkali-free glass fiber rope is filled between the waterproof and fire-resistant layer and the insulating and waterproof layer.

[0008] Preferably, the insulating waterproof layer is an aluminum-plastic composite tape.

[0009] Preferably, the waterproof and fire-resistant layer is composed of a ceramic low-smoke halogen-free flame-retardant material layer, a high flame-retardant fiber belt, and a ceramic waterproof coating layer from the inside to the outside.

[0010] Preferably, the conductor assembly comprises a plurality of cable cores, and the plurality of cable cores are respectively accommodated between two adjacent partition plates.

[0011] Preferably, the outer wall surfaces of the multiple cable cores are sequentially covered with a cross-linked polyethylene insulation layer and a protective layer from the inside to the outside, and the outer wall surfaces of the multiple protective layers are detachably connected to the outer wall surface of the central column, the walls of the two adjacent partitions, and the inner wall surface of the insulating waterproof layer.

[0012] Preferably, the protective layer, the insulating and waterproof layer, the central column and the gaps between the plurality of partition plates are all filled with refractory mud.

[0013] Preferably, the protective layer is made of B1 grade flame retardant low smoke halogen-free polyolefin material.

[0014] The technical solution of the utility model has the following beneficial effects:

[0015] The outer sheath layer made of B1-grade flame-retardant low-smoke halogen-free polyolefin material with good flame retardant properties can effectively suppress the spread of fire in case of fire. The fireproof bracket including the central column and multiple partitions made of high-strength, fire-resistant ceramic silicone rubber can provide stable support and effectively separate the conductor components, insulate heat and fire, and extend the safe working time of the cable. Through multiple waterproof structures such as the insulating waterproof layer, waterproof and fire-resistant layer, and outer sheath layer, as well as multiple flame-retardant and fire-resistant structures, the waterproof and fire-resistant properties are good, which can delay the spread of flames in case of fire, maintain stable operation, and buy a certain amount of rescue time for the fire department. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 Schematic diagram of the structure of the medium voltage cable in Example 1.

[0018] Figure markings: 1-conductor assembly, 11-cable core, 12-cross-linked polyethylene insulation layer, 13-protective layer, 2-insulating waterproof layer, 3-waterproof and fire-resistant layer, 31-ceramic low-smoke halogen-free flame retardant material layer, 32-high flame retardant fiber belt, 33-ceramic waterproof coating layer, 4-outer sheath layer, 5-fireproof bracket, 51-center column, 52-partition plate, 6-alkali-free glass fiber rope, 7-refractory mud. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] Example 1

[0023] like Figure 1As shown, this embodiment provides a B1-level waterproof and fireproof medium-voltage cable, including a conductor assembly 1, the outer periphery of the conductor assembly 1 is sequentially coated with an insulating waterproof layer 2, a waterproof and fire-resistant layer 3, and an outer sheath layer 4 from the inside to the outside, and the outer sheath layer 4 is made of a B1-level flame-retardant, low-smoke, halogen-free polyolefin material. The B1-level flame-retardant, low-smoke, halogen-free polyolefin material has good flame retardant properties, and will not burn rapidly even when exposed to flames. It can effectively suppress the spread of fire in the event of a fire, and has halogen-free, low smoke, low toxicity, low corrosion, and good environmental protection. It also includes a fireproof bracket 5, which includes a central column 51 and a plurality of partition plates 52. The central column 51 is arranged at the central position in the insulating waterproof layer 2, and the plurality of partition plates 52 are arranged around the central column 51 at intervals. One end of the plurality of partition plates 52 is bonded to the outer wall surface of the central column 51, and the other end of the plurality of partition plates 52 is bonded to the inner wall surface of the insulating waterproof layer 2. The central column 51 and the plurality of partitions 52 are made of ceramic silicone rubber, which has high tensile strength and compressive strength, can withstand certain tension and pressure, and has good fire resistance. The central column 51 and the plurality of partitions 52 can provide stable support and effectively separate the conductor assembly 1, heat insulation and fire insulation, and extend the safe working time of the cable. The B1-level waterproof and fireproof medium-voltage cable in this embodiment adopts multiple waterproof structures and multiple flame retardant and fire-resistant structures, with good waterproof and fire-resistant properties. It can delay the spread of flames in the event of a fire, maintain stable operation, and buy a certain amount of rescue time for the firefighters.

[0024] In this embodiment, the waterproof and fireproof layer 3 and the insulating and waterproof layer 2 are filled with alkali-free glass fiber ropes 6. The alkali-free glass fiber ropes 6 have high heat resistance, are lightweight, and have high tensile strength, and can protect the insulating and waterproof layer 2.

[0025] In this embodiment, the insulating waterproof layer 2 is an aluminum-plastic composite tape, which includes an aluminum base tape with a polyurethane waterproof layer attached to the surface of the aluminum base tape, and has strong high temperature resistant insulation ability, good waterproofness and tensile resistance.

[0026] In this embodiment, the waterproof and fire-resistant layer 3 is composed of a ceramic low-smoke halogen-free flame-retardant material layer 31, a high flame-retardant fiber tape 32, and a ceramic waterproof coating layer 33 from the inside to the outside. The ceramic low-smoke halogen-free flame-retardant material layer 31 is bonded to the insulating waterproof layer 2, the high flame-retardant fiber tape 32 is bonded to the ceramic low-smoke halogen-free flame-retardant material layer 31, and the ceramic waterproof coating layer 33 is closely combined with the high flame-retardant fiber tape 32 by hot melting or hot pressing.

[0027] The waterproof and fire-resistant layer 3 is composed of a composite of flame-retardant material and waterproof material. The ceramic low-smoke halogen-free flame-retardant material can form a ceramic inorganic shell at high temperature. It does not drip after burning and has a good fire-proof, heat-insulating and thermal-insulating effect. The high flame-retardant fiber belt 32 can quickly and automatically extinguish the flame even if it is ignited by an open flame. It has excellent fire-resistant performance, and the ceramic waterproof coating has excellent waterproof performance.

[0028] In this embodiment, the conductor assembly 1 includes a plurality of cable cores 11, and the plurality of cable cores 11 are respectively accommodated between two adjacent partition plates 52. The cable cores 11 are isolated from each other, and are heat-insulated and fire-proof, thereby extending the safe working time of the cable.

[0029] In this embodiment, the outer wall surfaces of the multiple cable cores 11 are sequentially covered with a cross-linked polyethylene insulation layer 12 and a protective layer 13 from the inside to the outside, and the outer wall surfaces of the multiple protective layers 13 are bonded to the outer wall surface of the central column 51, the walls of two adjacent partition plates 52, and the inner wall surface of the insulating waterproof layer 2.

[0030] In this embodiment, the gaps between the protective layer 13, the insulating and waterproof layer 2, the central column 51 and the plurality of partition plates 52 are filled with refractory mud 7, which further improves the fire resistance of the cable. The refractory mud 7 has the characteristics of high temperature resistance, flame retardancy, insulation, etc., and can effectively isolate flames and heat, prevent the spread of fire, and prevent the insulation material inside the cable from burning when a fire occurs, thereby protecting the normal operation of the cable.

[0031] In this embodiment, the protective layer 13 is made of B1 flame retardant low smoke halogen-free polyolefin material. B1 flame retardant low smoke halogen-free polyolefin material has good flame retardant properties. As the last layer of protection for the cable core 11, it can further delay the spread of fire and extend the safe working time of the cable.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A B1 grade waterproof and fireproof medium voltage cable, characterized in that: comprising a conductor assembly (1), The outer circumference of the conductor assembly (1) is sequentially coated with an insulating waterproof layer (2), a waterproof and fire-resistant layer (3), and an outer sheath layer (4) from the inside to the outside, and the outer sheath layer (4) is made of a B1-grade flame-retardant low-smoke halogen-free polyolefin material; The invention also comprises a fireproof bracket (5), wherein the fireproof bracket (5) comprises a central column (51) and a plurality of partition plates (52), wherein the central column (51) is arranged at a central position in the insulating waterproof layer (2), and the plurality of partition plates (52) are arranged around the central column (51) at intervals, and one end of the plurality of partition plates (52) are detachably connected to the outer wall surface of the central column (51), and the other end of the plurality of partition plates (52) are detachably connected to the inner wall surface of the insulating waterproof layer (2), and the central column (51) and the plurality of partition plates (52) are made of ceramic silicone rubber.

2. The B1 grade waterproof and fireproof medium voltage cable according to claim 1, characterized in that: Alkali-free glass fiber rope (6) is filled between the waterproof and fire-resistant layer (3) and the insulating and waterproof layer (2).

3. The B1 grade waterproof and fireproof medium voltage cable according to claim 1, characterized in that: The insulating waterproof layer (2) is an aluminum-plastic composite tape.

4. The B1 grade waterproof and fireproof medium voltage cable according to claim 1, characterized in that: The waterproof and fire-resistant layer (3) comprises, from the inside to the outside, a ceramic low-smoke halogen-free flame-retardant material layer (31), a high flame-retardant fiber belt (32), and a ceramic waterproof coating layer (33).

5. The B1 grade waterproof and fireproof medium voltage cable according to any one of claims 1 to 4, characterized in that: The conductor assembly (1) comprises a plurality of cable cores (11), and the plurality of cable cores (11) are respectively accommodated between two adjacent partition plates (52).

6. The B1 grade waterproof and fireproof medium voltage cable according to claim 5, characterized in that: The outer wall surfaces of the plurality of cable cores (11) are sequentially coated with a cross-linked polyethylene insulation layer (12) and a protective layer (13) from the inside to the outside, and the outer wall surfaces of the plurality of protective layers (13) are detachably connected to the outer wall surface of the central column (51), the wall surfaces of two adjacent partition plates (52), and the inner wall surface of the insulating waterproof layer (2).

7. The B1 grade waterproof and fireproof medium voltage cable according to claim 6, characterized in that: The protective layer (13), the insulating and waterproof layer (2), the central column (51) and the gaps between the plurality of partition plates (52) are all filled with refractory mud (7).

8. The B1-level waterproof and fireproof medium voltage cable according to claim 6, characterized in that: The protective layer (13) is made of B1-grade flame-retardant, low-smoke, halogen-free polyolefin material.

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