Composite fireproof cable

Abstract

The application discloses a composite fireproof cable, relates to the technical field of cables, and comprises a main lead wire and a plurality of twisted lead wires twisted on one side of the outer periphery of the main lead wire. One side of the outer periphery of the main lead wire is provided with a flexible filling layer, the plurality of twisted lead wires are inserted into the flexible filling layer and are separated from the main lead wire, one side of the outer periphery of the flexible filling layer is provided with a spiral polyester bundle layer, and one side of the outer periphery of the spiral polyester bundle layer is sequentially provided with an elastic supporting layer, a synthetic mica tape and a plasma halogen-free flame-retardant sleeve layer. The application has the effects that the plasma halogen-free flame-retardant sleeve layer significantly improves the structural strength and the fireproof performance, the plasma halogen-free flame-retardant sleeve layer has the effect of keeping the structural integrity at high temperatures, the elastic supporting layer and the synthetic mica tape cooperatively realize the effect of fireproofing and flame retarding, the structural integrity of the composite fireproof cable is ensured at super-high temperatures of more than 1200 DEG C, and the composite fireproof cable has the effect of significantly improving the high-temperature resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to a composite fireproof cable. BACKGROUND

[0002] Composite cables are particularly used for reducing consumption loss, and the transport and distribution cables are made of composite materials. The composite materials have the advantages of high strength, good designability, no creep, corrosion resistance and convenient use. In terms of fireproof performance, the oxygen index of the developed composite cable support is greater than or equal to 70%, which meets the safety requirements of fireproof, low smoke, halogen-free and non-toxic.

[0003] The Chinese patent application file with the publication number CN114898933A discloses a composite double-layer fireproof flame-retardant cable and a preparation method thereof. The composite double-layer fireproof flame-retardant cable includes a core conductor, a plurality of second conductor units twisted around the core conductor, a low-smoke halogen-free polyolefin layer covering the outer periphery of the second conductor units, and a sheath layer. The core conductor and the second conductor units are filled with a low-smoke halogen-free polyolefin filler. The core conductor includes a first conductor, a mica fireproof tape wrapped around the first conductor, and an insulating tape covering the outer side of the mica fireproof tape. The second conductor unit includes a second conductor, a mica fireproof tape wrapped around the outer periphery of the second conductor, and an insulating tape covering the outer side of the mica fireproof tape.

[0004] However, the composite double-layer fireproof flame-retardant cable only achieves fireproof and flame-retardant effects through the mica fireproof tape and the insulating tape covering the outer side of the mica fireproof tape, and the structure is simple and difficult to resist ultra-high temperatures exceeding 1200℃, thereby making it difficult to be applied in high-temperature environment operations, which needs to be improved. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a composite fireproof cable to significantly improve the high-temperature resistance. The specific scheme is as follows:

[0006] A composite fireproof cable includes a main conductor and a plurality of twisted conductors twisted on one side of the outer periphery of the main conductor. The outer periphery of one side of the main conductor is provided with a flexible filling layer, and the plurality of twisted conductors are inserted into the flexible filling layer and separated from the main conductor. The outer periphery of one side of the flexible filling layer is provided with a spiral polyester tape layer, and the outer periphery of one side of the spiral polyester tape layer is sequentially provided with an elastic support layer, a synthetic mica tape, and a plasma halogen-free flame-retardant sheath layer.

[0007] Preferably, the main conductor sequentially includes a main conductor, a main plasma polyester protective sheath layer, and a main shielding sheath layer from inside to outside. The main plasma polyester protective sheath layer is obtained by plasma modification treatment of a polyester protective sheath layer.

[0008] Preferably, the twisted conductor comprises, from inside to outside, a twisted conductor, a twisted plasma polyester protective sheath layer and a twisted shielding sheath layer; the twisted plasma polyester protective sheath layer is obtained by plasma modification treatment of a polyester protective sheath layer.

[0009] Preferably, the modification treatment of the main plasma polyester protective sheath layer and the twisted plasma polyester protective sheath layer specifically comprises the following steps: ①, polyester protective sheath material is prepared by using 180 parts of high molecular polyester, 0.8 parts of chitosan, 0.3 parts of graphene and 0.5 parts of sodium hydroxide by weight, and is coated on the outside of the main conductor and the twisted conductor respectively to form a polyester protective sheath layer; ②, the polyester protective sheath layer is put into a plasma generator filled with nitrogen; ③, the plasma generator releases plasma towards the outside of the polyester protective sheath layer, and the dose of the plasma is controlled to be 0.4-30 MJ / m 2 , and the treatment time is 10-30 s.

[0010] Preferably, the flexible filling layer is a honeycomb flexible filling layer, and is formed with a main hole for matching the main conductor wire and a twisted hole for matching the twisted conductor.

[0011] Preferably, the twisted conductor wire is provided with 6, the twisted hole is formed with 6 and is respectively located at 6 corner edges of the honeycomb flexible filling layer and is formed with an opening, the honeycomb flexible filling layer comprises 6 honeycomb side edges with equal arc distribution along the radial cross section and honeycomb arc-shaped edges for connecting adjacent two honeycomb side edges; the honeycomb arc-shaped edges match the opening of the twisted hole; the 6 corner edges of the honeycomb flexible filling layer are spirally wound on one side of the outer periphery of the main conductor wire.

[0012] Preferably, the spiral polyester binder layer comprises a thick diameter part matching the honeycomb side edge and a thin diameter part matching the honeycomb arc-shaped edge.

[0013] Preferably, the diameter of the thick diameter part gradually decreases from the middle to both ends; the diameter of the thin diameter part gradually increases from the middle to both ends.

[0014] Preferably, the plasma halogen-free flame-retardant sheath layer is obtained by plasma modification treatment of a halogen-free flame-retardant sheath layer; the modification treatment of the halogen-free flame-retardant sheath layer specifically comprises the following steps: ①, after the halogen-free flame-retardant sheath layer is coated on the outside of the synthetic mica tape, the halogen-free flame-retardant sheath layer is passed through a plasma generator with upper and lower high-voltage electrodes, and the plasma generator releases plasma towards the halogen-free flame-retardant sheath layer; ②, the halogen-free flame-retardant sheath layer passing out of the plasma generator is cooled to 0-4℃ by a low-temperature cooling section; ③, the halogen-free flame-retardant sheath layer cooled to 0-4℃ is placed at room temperature to gradually recover to room temperature state, the modification of the halogen-free flame-retardant sheath layer is completed, and the plasma halogen-free flame-retardant sheath layer is obtained.

[0015] Preferably: the temperature inside the plasma generator is room temperature, the speed of the halogen-free flame-retardant jacket is 3 m / min, the path length of the plasma is 1 m, and the plasma dose is 0.8-100 MJ / m 2 , and the plasma dose varies in a stepwise manner.

[0016] From the above scheme, the application provides a composite fireproof cable, which has the following beneficial effects:

[0017] 1. The plasma halogen-free flame-retardant jacket significantly improves the structural strength and fireproof performance, so that the plasma halogen-free flame-retardant jacket has the effect of maintaining structural integrity at high temperatures, and the elastic support layer and the synthetic mica tape cooperate to achieve the effect of fireproofing and flame retardation, thereby ensuring the structural integrity of the composite fireproof cable at an ultra-high temperature of more than 1200℃, so that the composite fireproof cable has the effect of significantly improving the high-temperature resistance.

[0018] 2. The main plasma polyester protective jacket and the twisted plasma polyester protective jacket obtained by plasma modification treatment of the polyester protective jacket have a high surface density and form a high-temperature resistant layer structure of macromolecular polyester, chitosan, graphene and sodium hydroxide, thereby improving the high-temperature resistance of the composite fireproof cable.

[0019] 3. The plasma halogen-free flame-retardant jacket obtained by plasma modification treatment of the halogen-free flame-retardant jacket forms a smooth and dense surface structure under the action of plasma, thereby significantly improving the structural strength, and further producing structural shrinkage through cooling treatment to avoid heat penetrating the plasma halogen-free flame-retardant jacket and affecting the internal structure of the composite fireproof cable, thereby achieving high-temperature resistance.

[0020] 4. The helical honeycomb flexible filler layer and the helical polyester bundle layer are helically wound, thereby effectively covering the main wire and the twisted wire, so that the two adjacent thick diameter parts in the middle part of the honeycomb side abut each other, thereby forming gaps between the two adjacent thin diameter parts and between the two adjacent thick diameter parts far from each other to be filled with the elastic support layer and connected to each other, so that the composite fireproof cable has the effects of high-pressure resistance and effectively relieving the effects of each direction, thereby avoiding the problems of heat expansion and fire caused by hard contact.

[0021] 5. The stepwise variation of the plasma dose release significantly improves the plasma modification treatment effect of the halogen-free flame-retardant jacket, thereby further improving the high-temperature resistance of the composite fireproof cable. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute a part of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor based on the provided drawings.

[0023] Figure 1 The structure diagram of the composite fireproof cable disclosed in the present application.

[0024] Explanation of reference signs: DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] As shown in Figure 1 , a composite fireproof cable comprises a main wire 1 and a plurality of twisted wires 2 twisted on one side of the outer periphery of the main wire 1.

[0027] A flexible filling layer is arranged on one side of the outer periphery of the main wire 1, and the plurality of twisted wires 2 are inserted into the flexible filling layer and separated from the main wire 1, so as to effectively avoid the problem of heat accumulation of the main wire 1 due to mutual friction with the twisted wires 2. A spiral polyester bundle layer 4 is arranged on one side of the outer periphery of the flexible filling layer. The spiral polyester bundle layer 4 plays a role of wrapping the flexible filling layer and the twisted wires 2 on the main wire 1, so as to improve the structural stability of the flexible filling layer and the twisted wires 2 on the main wire 1. An elastic support layer 5, a synthetic mica tape 6 and a plasma halogen-free flame-retardant jacket layer 7 are sequentially arranged on one side of the outer periphery of the spiral polyester bundle layer 4. Therefore, the composite protective cable significantly improves the structural strength and fireproof performance through the plasma halogen-free flame-retardant jacket layer 7, so that the plasma halogen-free flame-retardant jacket layer 7 has the effect of maintaining structural integrity at high temperature, and the elastic support layer 5 and the synthetic mica tape 6 cooperatively realize the effect of fireproofing and flame-retardation, thereby ensuring the structural integrity of the composite fireproof cable at an ultra-high temperature of more than 1200℃, so that the composite fireproof cable has the effect of significantly improving the high-temperature resistance.

[0028] It should be noted that the main lead 1 comprises, from inside to outside, the main conductor 11, the main plasma polyester protective sheath layer 12 and the main shielding sheath layer 13. The stranded conductor 21 comprises, from inside to outside, the stranded conductor 21, the stranded plasma polyester protective sheath layer 22 and the stranded shielding sheath layer 23. Among them, the main plasma polyester protective sheath layer 12 is obtained by plasma modification treatment of the polyester protective sheath layer, and the stranded plasma polyester protective sheath layer 22 is obtained by plasma modification treatment of the polyester protective sheath layer. The polyester protective sheath layer treated by plasma modification treatment will achieve the effect of slowing down heat transfer due to the formation of a dense layer structure on the surface, and has the characteristics of high temperature resistance and prevention of thermal decomposition and melting, so as to significantly improve the high temperature resistance of the composite fireproof cable.

[0029] As shown in Figure 1 The flexible filling layer is a honeycomb flexible filling layer 3, and is formed with main holes 33 for matching the main lead 1 and stranded holes 34 for matching the stranded conductor 21, so that the honeycomb flexible filling layer 3 forms a stable connection structure with the main lead 1 and the stranded conductor 2.

[0030] It should be noted that the stranded conductor 2 is provided with 6, and the corresponding stranded holes 34 are formed with 6 and are respectively located at the 6 corner angles of the honeycomb flexible filling layer 3, and an opening is formed at each corner angle. At the same time, the honeycomb flexible filling layer 3 comprises 6 honeycomb side edges 31 distributed along the radial cross section with equal arc and honeycomb arc edges 32 for connecting adjacent two honeycomb side edges 31. Among them, the honeycomb arc edge 32 matches the opening of the stranded hole 34; the 6 corner angles of the honeycomb flexible filling layer 3 are spirally wound on one side of the outer periphery of the main lead 1. The spiral polyester bundle layer 4 comprises a thick diameter part 42 matched with the honeycomb side edge 31 and a thin diameter part 41 matched with the honeycomb arc edge 32. And the diameter of the thick diameter part 42 gradually decreases from the middle to both ends; the diameter of the thin diameter part 41 gradually increases from the middle to both ends. Therefore, by spirally winding the honeycomb flexible filling layer 3 and the spiral polyester bundle layer 4, the main lead 1 and the stranded conductor 2 are effectively coated, so as to realize high temperature resistance while allowing two adjacent thick diameter parts 42 at the middle part of the honeycomb side edge 31 to abut each other, and then forming a gap between the adjacent two thin diameter parts 41 and the positions away from each other of the two adjacent thick diameter parts 42 for the elastic supporting layer 5 to fill and connect each other, so that the composite fireproof cable has the effects of high pressure resistance and effectively relieving the action in each direction, thereby avoiding the problems of heat expansion and fire caused by hard contact.

[0031] In the obtaining of the main plasma polyester protective sheath layer and the stranded plasma polyester protective sheath layer, the modification treatment of the polyester protective sheath layer specifically adopted includes the following steps:

[0032] ①, the polyester protective sleeve material is prepared by using 180 parts of high molecular polyester, 0.8 parts of chitosan, 0.3 parts of graphene and 0.5 parts of sodium hydroxide by weight, and is respectively coated on the outside of the main conductor and the stranded conductor to form a polyester protective sleeve layer;

[0033] ②, the polyester protective sleeve layer is passed through the plasma generator filled with nitrogen;

[0034] ③, the plasma is released from the outside of the plasma generator to the polyester protective sleeve layer, and the dose of the plasma is controlled to be 0.4-30 MJ / m 2 , and the treatment time is 10-30 s.

[0035] Among them, the dose of the plasma is distributed in a stepwise manner, and specifically, the dose of the plasma is controlled to be 0.4 MJ / m 2 in the first stage, 8 MJ / m 2 in the second stage, 28 MJ / m 2 in the third stage, and 30 MJ / m 2 in the fourth stage.

[0036] In the obtaining of the plasma halogen-free flame-retardant sleeve layer, the modification treatment of the halogen-free flame-retardant sleeve layer specifically includes the following steps:

[0037] ①, after the halogen-free flame-retardant sleeve layer is coated on the outside of the synthetic mica tape, it is passed through the plasma generator with upper and lower high-voltage electrodes, and the plasma generator releases plasma to the halogen-free flame-retardant sleeve layer;

[0038] ②, the halogen-free flame-retardant sleeve layer passing out of the plasma generator is cooled to 0-4℃ by the low-temperature cooling section;

[0039] ③, the halogen-free flame-retardant sleeve layer cooled to 0-4℃ is placed at room temperature to gradually recover to room temperature state, the modification of the halogen-free flame-retardant sleeve layer is completed, and the plasma halogen-free flame-retardant sleeve layer is obtained.

[0040] Among them, the temperature in the plasma generator is room temperature, the passing speed of the halogen-free flame-retardant sleeve layer is 3 m / min, the passing path length of the plasma is 1 m, the dose of the plasma is 0.8-100 MJ / m 2 , and the dose of the plasma is distributed in a stepwise manner, specifically, the dose of the plasma is controlled to be 0.8 MJ / m 2 in the first stage, 12 MJ / m 2 in the second stage, 80 MJ / m 2 in the third stage, and 100 MJ / m 2In the fifth stage, the dose of the plasma is 90 MJ / m 2 .

[0041] Therefore, the composite fireproof cable adopts the modification treatment, realizes that the main plasma polyester protective sheath layer and the twisted plasma polyester protective sheath layer are obtained from the polyester protective sheath layer through the plasma modification treatment, have high surface compactness, and make the high molecular polyester, chitosan, graphene and sodium hydroxide form a high-temperature-resistant layer structure, so that the composite fireproof cable has the effect of significantly improving the high-temperature-resistant performance; and the plasma halogen-free flame-retardant sheath layer is obtained from the halogen-free flame-retardant sheath layer through the plasma modification treatment, so that the halogen-free flame-retardant sheath layer forms a smooth and compact surface structure under the action of the plasma, significantly improves the structural strength, and further produces structural shrinkage through cooling treatment to avoid heat penetrating the plasma halogen-free flame-retardant sheath layer to affect the internal structure of the composite fireproof cable, and realizes the effect of high-temperature resistance; wherein the plasma dose release in the form of step change significantly improves the plasma modification treatment effect of the halogen-free flame-retardant sheath layer and the polyester protective sheath layer, thereby further improving the high-temperature-resistant performance of the composite fireproof cable.

[0042] It is detected that the composite fireproof cable obtained by the embodiment has the effect of resisting 1300℃ high temperature.

[0043] The "first", "second", "third", "fourth" and the like (if any) described in the present application are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods or devices.

[0044] It should be noted that the description involving "first", "second" and the like in the present application is only for description purpose, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope claimed by the present application.

[0045] The principles and implementation manners of the present application are described by using specific examples in the present application, and the above examples are only used to help understand the method and its core idea of the present application; meanwhile, for the general technical personnel in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application, and the above description should not be understood as the limitation of the present application.

Claims

1. A composite fireproof cable comprising a main conductor (1) and a plurality of stranded conductors (2) stranded on one side of the outer periphery of the main conductor (1), characterized in that: The outer peripheral side of the main conductor (1) is provided with a flexible filling layer, a plurality of twisted conductors (2) are inserted into the flexible filling layer and separated from the main conductor (1), the outer peripheral side of the flexible filling layer is provided with a spiral polyester bundle layer (4), and the outer peripheral side of the spiral polyester bundle layer (4) is sequentially provided with an elastic support layer (5), a synthetic mica tape (6) and a plasma halogen-free flame-retardant sleeve layer (7); the main conductor (1) sequentially includes a main conductor (11), a main plasma polyester protective sleeve layer (12) and a main shielding sleeve layer (13) from inside to outside; the main plasma polyester protective sleeve layer (12) is obtained by plasma modification treatment of the polyester protective sleeve layer; the twisted conductor (2) sequentially includes a twisted conductor (21), a twisted plasma polyester protective sleeve layer (22) and a twisted shielding sleeve layer (23) from inside to outside; the twisted plasma polyester protective sleeve layer (22) is obtained by plasma modification treatment of the polyester protective sleeve layer; the modification treatment of the main plasma polyester protective sleeve layer (12) and the twisted plasma polyester protective sleeve layer (22) specifically includes steps ①, polyester protective sleeve material is prepared by using 180 parts of high molecular polyester, 0.8 parts of chitosan, 0.3 parts of graphene and 0.5 parts of sodium hydroxide by weight, and is respectively coated on the outer side of the main conductor (11) and the twisted conductor (21) to form a polyester protective sleeve layer; ②, the polyester protective sleeve layer is put into the plasma generator filled with nitrogen; ③, the plasma generator releases plasma towards the outer side of the polyester protective sleeve layer, and the dose of the plasma is controlled to be 0.4-30 MJ / m2, and the treatment time is 10-30 s.

2. A composite fire resistant cable according to claim 1, characterised in that: The flexible filling layer is a honeycomb flexible filling layer (3), and is formed with a main hole (33) matched with the main conductor (1) and a twisted hole (34) matched with the twisted conductor (21).

3. A composite fire resistant cable according to claim 2, characterised in that: The twisted conductor (2) is provided with six, the twisted hole (34) is formed with six and is located at six corners of the honeycomb flexible filling layer (3) and is formed with an opening, the honeycomb flexible filling layer (3) includes six honeycomb side edges (31) distributed along the radial cross section with equal curvature and honeycomb arc edges (32) for connecting adjacent two honeycomb side edges (31); the honeycomb arc edge (32) is matched with the opening of the twisted hole (34); the six corners of the honeycomb flexible filling layer (3) are spirally wound on the outer peripheral side of the main conductor (1).

4. A composite fire resistant cable according to claim 3, characterised in that: The spiral polyester bundle layer (4) includes a thick diameter part (42) matched with the honeycomb side edge (31) and a thin diameter part (41) matched with the honeycomb arc edge (32).

5. A composite fire resistant cable according to claim 4, characterised in that: The diameter of the thick diameter part (42) gradually decreases from the middle to both ends; the diameter of the thin diameter part (41) gradually increases from the middle to both ends.

6. A composite fire resistant cable according to claim 1, wherein: The plasma halogen-free flame-retardant sheath (7) is obtained by halogen-free flame-retardant sheath through plasma modification treatment; the modification treatment of the halogen-free flame-retardant sheath specifically comprises the following steps: ① after the halogen-free flame-retardant sheath is coated outside the synthetic mica tape (6), the halogen-free flame-retardant sheath passes through a plasma generator with upper and lower high-voltage electrodes, and the plasma generator releases plasma to the halogen-free flame-retardant sheath; ② the halogen-free flame-retardant sheath that passes out of the plasma generator is cooled to 0-4 ℃ by a low-temperature cooling section; ③ the halogen-free flame-retardant sheath cooled to 0-4 ℃ is placed at normal temperature to gradually recover to normal temperature state, the modification of the halogen-free flame-retardant sheath is completed, and the plasma halogen-free flame-retardant sheath (7) is obtained.

7. A composite fire resistant cable according to claim 6, characterised in that: The temperature inside the plasma generator is normal temperature, the passing speed of the halogen-free flame-retardant coating is 3 m / min, the passing path length of the plasma is 1 m, and the plasma dose is 0.8-100 MJ / m 2 , and the plasma dose changes in a stepwise manner.

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