Power cable with B1-level high-flame-retardant, zero-dripping and strong-fire-resistant characteristics

Abstract

The invention discloses a power cable with B1-level high-flame-retardant zero-dripping strong fire-resistant characteristics, which is characterized in that a fire-resistant layer is wrapped on the outer side of a conductive wire core, an extruded insulating layer is arranged on the outer side of the fire-resistant layer, an alkali-free glass fiber rope is filled outside the insulating layer, an alkali-free glass fiber tape is used for wrapping to form a cable, and a fire-resistant oxygen barrier layer is arranged on the outer side of a cabling wrapping tape. The outer side of the fireproof layer is wrapped with a fireproof oxygen-isolating layer, the outer side of the fireproof oxygen-isolating layer is wrapped with a steel tape armor, the outer side of the steel tape armor is wrapped with a wrapping tape flame-retardant layer, the outer side of the wrapping tape flame-retardant layer is wrapped with an outer protective layer, the fireproof layer comprises a ceramic fireproof mica tape and a ceramic silica gel tape, and the fireproof oxygen-isolating layer is a ceramic low-smoke halogen-free polyolefin oxygen-isolating layer. The steel tape armoring is wound on the outer side of the fire-resistant oxygen-isolating layer and is provided with two layers, and the wrapping tape flame-retardant layer adopts double layers of wrapping tapes which are arranged in opposite wrapping directions and are tightly wrapped, so that the fire-resistant and flame-retardant properties of the power cable are improved, and the cable has the characteristics of B1-level high flame retardance, zero dripping during combustion and strong fire resistance at the temperature of 950-1000 DEG C.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of flame-retardant fire-resistant power cables, and particularly relates to a power cable with B1-level high flame-retardant zero-dripping strong fire-resistant characteristics. BACKGROUND

[0002] In recent years, with the development of society and the growth of urban population, the construction of high-rise buildings, subways, tunnel traffic, and the increase of large public places and public transportation facilities, the importance of fire safety is increasingly highlighted. Once the power cable as the main power supply line cannot guarantee normal power supply in case of fire, it will lead to the failure of the normal operation of the fire control system, thereby increasing the difficulty of fire rescue and crowd evacuation.

[0003] The electrical design of civil buildings clearly requires the burning performance of cables. For the alarm bus of the evacuation passage in densely populated places, public buildings exceeding 100m in height, financial buildings in Class 1 high-rise buildings, and provincial power dispatching buildings, B1-level burning performance of the electric wire and cable should be selected, and the burning characteristics should meet the standard requirements. The requirements for the fire resistance performance of the cable in the standard of flame-retardant and fire-resistant electric wire and cable include test methods, test time, etc.

[0004] In actual fire accidents, not only does the cable need to have high flame-retardant performance to effectively delay the spread of flames, but it also needs to have strong fire resistance to maintain power supply for a long time under high-temperature flame burning. After a fire occurs, the surface of all combustible materials in the room will burn under the condition of flashover, and the temperature will rise sharply, and the temperature around the building fire can reach 800-1000℃. At present, the domestic market mostly uses mineral insulation to make the cable have fire resistance. The existing fire-resistant power cable has low flame-retardant ability, or the power cable with high flame-retardant performance does not have strong fire resistance of 950-1000℃.

[0005] The invention disclosed in the publication No. CN116959791A discloses a low-smoke halogen-free flame-retardant B1-grade medium-voltage fire-resistant power cable, and the technical scheme is that the protective compression-resistant layer comprises compression-resistant blocks, elastic grooves are formed in the interiors of the compression-resistant blocks, elastic blocks for resisting extrusion are mounted in the groove cavities of the elastic grooves, and arc-shaped blocks for supporting and limiting the elastic blocks in cooperation with the compression-resistant blocks are mounted at one end of the elastic blocks; when the power cable is fastened with excessive force, the elastic blocks drive the arc-shaped blocks to deform, extrude the elastic blocks at the other end surfaces of the arc-shaped blocks, and drive the elastic blocks at the other end surfaces to deform, so that the excessive pressure generated on the cable during tightening is further reduced; the ceramic powder fixedly mounted in the middle of the mica tape further increases the high-temperature resistance of the power cable, so that the high-temperature resistance of the second high-temperature-resistant layer protects the cable installed in the interior of the protective compression-resistant layer when a fire occurs, and the main problem solved by the invention is the insulation layer circuit breaking problem, the protective compression-resistant layer is used for buffering, and the flame-retardant and fire-resistant effects are not introduced.

[0006] Therefore, there is still a need to develop a new type of fire-resistant layer and flame-retardant layer of a cable, so that the cable has the characteristics of B1-grade high flame retardation, zero dripping during combustion, and strong fire resistance at 950-1000 DEG C. SUMMARY

[0007] The purpose of the present application is to solve the problems of the prior art, and to provide a power cable with B1-grade high flame retardation, zero dripping, and strong fire resistance, thereby improving the fire resistance and flame retardation of the power cable.

[0008] To solve the above technical problems, the technical scheme adopted by the present application is: A power cable with B1-grade high flame retardation, zero dripping, and strong fire resistance comprises a conductive core, a fire-resistant layer wrapped outside the conductive core, an insulation layer extruded outside the fire-resistant layer, and a cable-laying wrapping tape arranged outside the insulation layer, and the cable-laying wrapping tape is further wrapped with a fire-resistant oxygen barrier layer, a steel belt armor, a wrapping tape flame-retardant layer, and an outer sheath in sequence. The fire-resistant layer is formed by overlapping wrapping of ceramicized fire-resistant mica tape and ceramicized silica gel tape; The fire-resistant oxygen barrier layer is an extruded ceramicized low-smoke halogen-free polyolefin oxygen barrier layer. A filling layer is further arranged in the gap between the insulation layer and the cable-laying wrapping tape.

[0009] The steel belt armor is wound outside the fire-resistant oxygen barrier layer and arranged in double layers.

[0010] The cable-laying wrapping tape is formed by overlapping wrapping of alkali-free glass fiber tape.

[0011] The wrapping tape flame-retardant layer is formed by overlapping wrapping of double layers of alkali-free glass fiber tape, and the double layers of wrapping tape are arranged in opposite directions.

[0012] The fireproof layer has a coverage rate of greater than or equal to 20%, and is uniformly and flatly wrapped.

[0013] The filling layer is filled with alkali-free glass fiber ropes.

[0014] The steel belt armor is wrapped by double-layer galvanized steel belts.

[0015] The insulation layer is silane cross-linked polyethylene insulation.

[0016] The outer sheath is an extruded low-smoke halogen-free flame-retardant polyolefin sheath.

[0017] The beneficial effects of the present application are: (1) The present application discloses a power cable with B1 grade high flame-retardant zero-dripping strong fireproof characteristics. A fireproof layer is wrapped outside the conductive core, an extruded insulation layer is arranged outside the fireproof layer, alkali-free glass fiber ropes are filled outside the insulation layer, and the cables are wrapped by alkali-free glass fiber belts, a fireproof oxygen barrier layer is arranged outside the wrapped belt, a steel belt armor is wrapped outside the fireproof oxygen barrier layer, a wrapped belt flame-retardant layer is wrapped outside the steel belt armor, an outer protective layer is wrapped outside the wrapped belt flame-retardant layer, the fireproof layer comprises a ceramicized fireproof mica tape and a ceramicized silica gel tape, the fireproof oxygen barrier layer is a ceramicized low-smoke halogen-free polyolefin oxygen barrier layer, the steel belt armor is wound outside the fireproof oxygen barrier layer and arranged as double layers, the wrapped belt flame-retardant layer is arranged in opposite directions by double-layer wrapped belts, and the wrapping is tight. The fireproof and flame-retardant properties of the power cable are improved, so that the cable has the characteristics of B1 grade high flame-retardant, zero-dripping combustion and strong fire resistance at 950-1000 DEG C.

[0018] (2) The fireproof temperature is increased to 950-1000 DEG C, and the cable has strong fireproof characteristics; the combustion characteristics of the cable meet the B1 grade flame-retardant in GB31247-2014 standard, the combustion dripping / microparticle level meets the d0 level, the smoke toxicity meets the t0 level, and the cable has the characteristics of B1 grade high flame-retardant zero-dripping. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the present application; Table 1 is the combustion and fireproof characteristic detection data. DETAILED DESCRIPTION

[0020] The embodiments of the present application are described below by specific specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0021] Please refer to Figure 1It is to be understood that the structure, proportion, size and the like shown in the drawings attached to the present specification are only used to cooperate with the content disclosed in the specification for understanding and reading by those skilled in the art, and are not used to limit the defined conditions for implementing the present application, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the present application, should still fall within the scope covered by the disclosed technology.

[0022] The present application provides a power cable with B1 high flame-retardant zero-dripping strong fire-resistant characteristics, as shown in Figure 1

[0023] A power cable with B1 high flame-retardant zero-dripping strong fire-resistant characteristics, comprising a conductive core 1, a fire-resistant layer 2 wrapped outside the conductive core 1, an insulation layer 3 extruded outside the fire-resistant layer 2, and a cable wrapping tape 5 arranged outside the insulation layer 3, and the cable wrapping tape 5 is further wrapped with a fire-resistant oxygen barrier layer 6, a steel tape armor 7, a wrapping flame-retardant layer 8 and an outer sheath 9 in sequence. The fire-resistant oxygen barrier layer 6 adopts an extruded ceramic low-smoke halogen-free polyolefin oxygen barrier layer, which is uniformly plasticized and bright. The steel tape armor 7 is wound outside the fire-resistant oxygen barrier layer 6 and is arranged as double layers. The fire-resistant layer 2 is made of ceramic fire-resistant mica tape and ceramic silica gel tape overlapped and wrapped. A filling layer 4 is further arranged in the gap between the insulation layer 3 and the cable wrapping tape 5. The filling layer 4 is filled with alkali-free glass fiber rope, and the filling is required to be uniform and compact. The steel tape armor 7 is made of double layers of galvanized steel tape wrapped, and the wrapping is uniform and round. The wrapping flame-retardant layer 8 is arranged with double layers of wrapping tape in opposite directions, and the wrapping is compact.

[0024] In this embodiment, the conductive core 1 adopts copper conductor, and the conductor direct current resistance at 20℃ meets the requirements of GB / T3956 standard.

[0025] The cable wrapping tape 5 is made of alkali-free glass fiber tape overlapped and wrapped, and the overlapping rate is ≥20%, the wrapping is uniform, compact and not loose. The wrapping flame-retardant layer 8 is made of double layers of alkali-free glass fiber tape overlapped and wrapped, and the overlapping rate is ≥25%, and the double layers of wrapping tape are arranged in opposite directions, and the wrapping is uniform, compact and not loose. The overlapping rate of the fire-resistant layer 2 is ≥20%, and the wrapping is overlapped, uniform and smooth.

[0026] The insulation layer 3 adopts silane cross-linked polyethylene insulation, and the insulation thickness of the insulation layer is controlled according to the requirements of GB / T12706.1 standard.

[0027] The outer sheath 9 adopts extruded low-smoke halogen-free flame-retardant polyolefin sheath material, which is uniformly plasticized and has no air holes, and the sheath thickness meets the requirements of GB / T12706.1 standard.

[0028] ​The power cable, which has B1-level high flame retardancy, zero dripping, and strong fire resistance characteristics, has been tested by a national-level authoritative third-party institution. The test data of its combustion and fire resistance characteristics are shown in Table 1 below.

[0029] According to the test data, the cable's combustion characteristics meet the requirements for Class B1 flame retardancy in GB31247-2014 standard, and the combustion droplets / particles level meets the d0 level, while the smoke toxicity meets the t0 level. The cable's fire resistance characteristics meet the requirements of GB / T19666-2019 standard and achieve strong fire resistance of 950~1000℃.

[0030] Table 1. Test data on combustion and fire resistance properties This new structure improves the fire resistance and flame retardancy of power cables, and increases the fire resistance temperature to 950~1000℃, giving the cable strong fire resistance characteristics. The cable's combustion characteristics meet the B1 level flame retardancy standard of GB31247-2014, and the combustion drip / particle level meets the d0 level, while the smoke toxicity meets the t0 level. The cable has B1 level high flame retardancy and zero drip characteristics.

[0031] If this patent uses terms such as "first" and "second" to define components, those skilled in the art should know that the use of "first" and "second" is merely for the convenience of describing the invention and simplifying the description, and the above terms have no special meaning.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this invention is defined by the appended claims and their equivalents.

[0033] The endpoints and any values ​​of the ranges disclosed herein are not limited to the exact ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

Claims

1. A power cable with B1-grade high flame retardancy, zero dripping, and strong fire resistance, characterized in that: It includes a conductive core, a fire-resistant layer wrapped around the outside of the conductive core, an insulation layer extruded around the outside of the fire-resistant layer, and a cable wrapping tape laid around the outside of the insulation layer. The cable wrapping tape is also wrapped in sequence with a fire-resistant oxygen barrier layer, a steel tape armor, a flame-retardant layer, and an outer sheath. The refractory layer is made by overlapping and wrapping ceramicized refractory mica tape and ceramicized silicone tape; The fire-resistant oxygen barrier layer adopts an extruded ceramicized low-smoke halogen-free polyolefin oxygen barrier layer; A filling layer is also provided in the gap between the insulation layer and the cable wrapping tape.

2. The power cable with B1-grade high flame retardancy, zero dripping, and strong fire resistance as described in claim 1, characterized in that: The steel strip armor is wrapped around the outside of the fire-resistant oxygen barrier layer and is configured as a double layer.

3. The power cable with B1-grade high flame retardancy, zero dripping, and strong fire resistance as described in claim 1, characterized in that: The cable wrapping tape is made of alkali-free glass fiber tape wrapped in overlapping layers.

4. A power cable with B1-grade high flame retardancy, zero dripping, and strong fire resistance as described in claim 1, characterized in that: The flame-retardant layer of the wrapping tape is made of double-layered alkali-free glass fiber tape wrapped in opposite directions.

5. A power cable with B1-grade high flame retardancy, zero dripping, and strong fire resistance as described in claim 1, characterized in that: The refractory layer has an overlap rate of ≥20% and the wrapping is uniform and flat.

6. A power cable with B1-grade high flame retardancy, zero dripping, and strong fire resistance as described in claim 1, characterized in that: The filling layer is filled with alkali-free glass fiber rope.

7. A power cable with B1-grade high flame retardant, zero-drip, and strong fire-resistant properties according to claim 1, characterized in that: The steel strip armor is made of double-layer galvanized steel strip wrapped around it.

8. A power cable with B1-grade high flame retardancy, zero dripping, and strong fire resistance as described in claim 1, characterized in that: The insulation layer is made of silane cross-linked polyethylene.

9. A power cable with B1-grade high flame retardancy, zero dripping, and strong fire resistance as described in claim 1, characterized in that: The outer sheath is made of extruded low-smoke halogen-free flame-retardant polyolefin.

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