Self-supporting cable

Abstract

The invention specifically discloses a self-supporting cable, and relates to the technical field of wires and cables, the self-supporting cable comprises a cable core, a filling layer and an outer sheath, the cable core comprises a supporting strip and wire cores, the supporting strip is provided with a plurality of supporting grooves arranged along the circumferential direction of the supporting strip, the number of the wire cores is multiple, and the multiple wire cores are placed in the multiple supporting grooves in a one-to-one correspondence manner; the filling layer is formed by extruding ceramic silica gel cement on the peripheral side of the cable core, so that the cable core is stably fixed on the supporting groove; according to the self-supporting cable provided by the embodiment of the invention, when a fire disaster occurs, the filling layer is vitrified and becomes a vitrified shell, the cable core is wrapped in the shell, the cable core is prevented from being in direct contact with flames, and under the combined action of the supporting strips and the vitrified filling layer, the multiple wire cores are stably supported and separated, so that the self-supporting cable has the advantages that the fire disaster is avoided, and the service life of the cable core is prolonged. The cable provided by the embodiment of the invention can bear the spraying impact of water and is not easy to short-circuit, so that the cable is not easy to lose efficacy when bearing the combustion of flame and the spraying impact of water at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of electric wires and cables, and in particular to a self-supporting cable. Background Art

[0002] As an indispensable part of modern power and communication systems, cables are diverse in variety and widely used, playing an important role in social production and daily life. In some crowded places, such as shopping malls, office buildings, libraries, hospitals, schools, parking lots, etc., there are automatic sprinkler fire extinguishing systems installed along the cable lines, so that water can be automatically sprayed immediately when a fire is sensed to control the disaster. However, when working under the above conditions, the current cables have to withstand the burning of flames and the impact of water spray at the same time, which is easy to fail and seriously affect the fire extinguishing work of the automatic sprinkler fire extinguishing system. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a self-supporting cable that is not prone to failure when it is subjected to the burning of flames and the impact of water spray at the same time.

[0004] A self-supporting cable according to an embodiment of the present invention comprises a cable core, a filling layer and an outer sheath, wherein the cable core comprises a support bar and a wire core, the support bar having a plurality of support grooves arranged along its circumference, and a plurality of wire cores are provided, and the plurality of wire cores are placed one by one in the plurality of support grooves; the filling layer is formed by extruding ceramic silica gel on the outer peripheral side of the cable core so as to stabilize the wire core on the support groove; the outer sheath is arranged on the outer peripheral side of the filling layer.

[0005] The self-supporting cable according to the embodiment of the present invention has at least the following beneficial effects: since multiple wire cores are placed in multiple support grooves in a one-to-one correspondence, and the filling layer is formed by extruding ceramic silica gel mud on the outer peripheral side of the cable core, so that the wire core is firmly fixed on the support groove. Therefore, in the event of a fire, the filling layer is ceramicized and becomes a ceramic shell, which wraps the cable core inside to prevent the cable core from directly contacting the flame, and under the joint action of the support strip and the ceramic filling layer, the multiple wire cores are firmly supported and separated, and can withstand the impact of water spray without being easily short-circuited. Therefore, the self-supporting cable of the embodiment of the present invention is not easy to fail when it is subjected to the burning of flames and the impact of water spray at the same time.

[0006] According to an embodiment of the present invention, the support bar is made of ceramic polyolefin oxygen barrier material.

[0007] According to an embodiment of the present invention, the outer sheath is made of low-smoke halogen-free flame-retardant polyolefin sheath material.

[0008] According to an embodiment of the present invention, it also includes a protective layer, which is arranged between the filling layer and the outer sheath and is formed by wrapping with a low-smoke, halogen-free and highly flame-retardant wrapping tape.

[0009] According to an embodiment of the present invention, the wire core includes a conductor and an insulating layer, and the insulating layer is arranged on the outer peripheral side of the conductor.

[0010] According to an embodiment of the present invention, the insulating layer is made of ceramic polyolefin material.

[0011] According to an embodiment of the present invention, the conductor is a first type annealed copper conductor or a second type annealed copper conductor.

[0012] According to an embodiment of the present invention, the wire core further comprises a fire-resistant layer, wherein the fire-resistant layer is provided between the outer circumference of the conductor and the inner circumference of the insulating layer.

[0013] According to an embodiment of the present invention, the fire-resistant layer is formed by wrapping a mica tape and a glass fiber tape around the conductor in sequence.

[0014] According to an embodiment of the present invention, the mica tape and the glass fiber tape are both wrapped around the conductor in a continuous overlapping manner.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 FIG. 1 is a schematic cross-sectional view of a self-supporting cable according to an embodiment of the present invention.

[0018] Reference numerals:

[0019] Self-supporting cable 1000;

[0020] Cable core 100; support bar 110; support groove 111; wire core 120; conductor 121; insulation layer 122; fire-resistant layer 123;

[0021] Filling layer 200;

[0022] Outer sheath 300;

[0023] Protective layer 400. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it is necessary to understand that descriptions involving orientations, such as up, down, inside, outside, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0028] As an indispensable part of modern power and communication systems, cables are diverse in variety and widely used, playing an important role in social production and daily life. In some crowded places, such as shopping malls, office buildings, libraries, hospitals, schools, parking lots, etc., there are automatic sprinkler fire extinguishing systems installed along the cable lines, so that water can be automatically sprayed immediately when a fire is sensed to control the disaster. However, when working under the above conditions, the current cables have to withstand the burning of flames and the impact of water spray at the same time, which is easy to fail and seriously affect the fire extinguishing work of the automatic sprinkler fire extinguishing system.

[0029] To this end, the present invention provides a self-supporting cable 1000, specifically referring to the accompanying drawings of the specification Figure 1 shown.

[0030] Reference Figure 1As shown, a self-supporting cable 1000 of an embodiment of the present invention comprises a cable core 100, a filling layer 200 and an outer sheath 300. The cable core 100 comprises a support bar 110 and a wire core 120. It should be noted that the support bar 110 has a plurality of support grooves 111, and the plurality of support grooves 111 are arranged along the circumference of the support bar 110. It should also be noted that there are a plurality of wire cores 120, and the plurality of wire cores 120 are placed in a plurality of support grooves 111 one by one. In other words, the number of wire cores 120 is equal to the number of support grooves 111, and each wire core 120 has a corresponding support groove 111, and the wire core 120 is placed on the corresponding support groove 111, so that the support bar 110 can well support and separate each wire core 120. It should be noted that when cabling, the support bar 110 is placed first, and then the plurality of wire cores 120 are placed in a plurality of support grooves 111 one by one.

[0031] Reference Figure 1 As shown, in one embodiment, the support bar 110 has four support grooves 111, and the four support grooves 111 are arranged along the circumference of the support bar 110. There are four cores 120, and the four cores 120 are placed in the four support grooves 111 one by one. In one embodiment, after the four cores 120 are placed, the four cores 120 are placed in a rectangular shape on the cross section of the self-supporting cable 1000. It can be understood that through the above arrangement, the support bar 110 is located at the center of the four cores 120, the position arrangement is more reasonable, and the support effect of the support bar 110 on the four cores 120 is better. It should be noted that the number of support grooves 111 of the support bar 110 can also be three, five, six, seven, etc., which is not specifically limited here; the number of cores 120 can also be three, five, six, seven, etc., which is not specifically limited here, as long as the number of support grooves 111 of the support bar 110 is equal to the number of cores 120.

[0032] Reference Figure 1 As shown, it should be noted that the filling layer 200 is formed by extruding ceramic silicone mud on the outer peripheral side of the cable core 100 to stabilize the core 120 on the support groove 111. It should be noted that ceramic silicone mud is a composite material mixed with silica gel and ceramic powder. At high temperatures of 350°C to 3000°C, ceramic silicone mud can form a hard ceramic protective layer 400, which plays a role in isolating fire sources and preventing fire; while at room temperature, it maintains the characteristics of silicone rubber and is a new type of high-molecular functional material with high performance, low cost, non-toxicity, environmental protection and safety. It should be noted that the extrusion thickness of the ceramic silicone mud is 1.5mm to 2mm.

[0033] It can be understood that, through the above-mentioned arrangement, in the event of a fire, the filling layer 200 is ceramicized and becomes a ceramic shell, which wraps the cable core 100 inside to prevent the cable core 100 from directly contacting the flame. Under the joint action of the support strip 110 and the ceramic filling layer 200, the multiple wire cores 120 are firmly supported and separated, and can withstand the impact of water spray without being prone to short circuit. Therefore, the self-supporting cable 1000 of the embodiment of the present invention is not prone to failure when it is subjected to the burning of flames and the impact of water spray at the same time.

[0034] In a self-supporting cable 1000 of one embodiment of the present invention, the support bar 110 is made of a ceramic polyolefin oxygen barrier material. It should be noted that at room temperature, the ceramic polyolefin oxygen barrier material has the same physical and mechanical properties and electrical insulation properties as ordinary low-smoke halogen-free cable materials; but under high temperature or flame conditions, it can be quickly sintered into a hard ceramic-like hard shell, which does not melt or drip, and has good support, heat insulation, oxygen isolation and fire isolation effects. It can be understood that through the above-mentioned arrangement, the ceramic-like shell formed by the sintering of the support bar 110 can firmly support and separate the multiple cores 120 together with the ceramic-like shell formed by the sintering of the filling layer 200, so as to better prevent the self-supporting cable 1000 from failing when it is subjected to the burning of flames and the impact of water spray at the same time. It should be noted that the oxygen index of the support bar 110 should not be less than 45%.

[0035] Reference Figure 1 As shown, in a self-supporting cable 1000 according to an embodiment of the present invention, the outer sheath 300 is arranged on the outer peripheral side of the filling layer 200. It should be noted that the outer sheath 300 mainly plays the role of protecting the internal structure. In one embodiment, the outer sheath 300 is made of low-smoke halogen-free flame-retardant polyolefin sheath material. It should be noted that the low-smoke halogen-free flame-retardant polyolefin sheath material is a polymer material prepared by adding inorganic and organic flame retardants, smoke suppressants and other additives with polyolefin as the main base material. This material has excellent flame retardant properties, low-smoke halogen-free properties and good mechanical properties, and is an ideal material for the outer sheath 300. It can be understood that in this embodiment, when the self-supporting cable 1000 encounters a fire, the outer sheath 300 can play a good flame retardant role. Even if the outer sheath 300 burns, no toxic and harmful gases and thick smoke will be generated, which is more environmentally friendly. It should be noted that the outer sheath 300 is made of low-smoke halogen-free flame-retardant polyolefin sheath material by extrusion, the thickness of the extrusion is 1.8 mm to 3.2 mm, and the material oxygen index is not less than 42%.

[0036] Reference Figure 1As shown, a self-supporting cable 1000 according to an embodiment of the present invention further includes a protective layer 400. It should be noted that the protective layer 400 is disposed between the filling layer 200 and the outer sheath 300. That is, the protective layer 400 is disposed between the outer circumference of the filling layer 200 and the inner circumference of the outer sheath 300. It should also be noted that the protective layer 400 is formed by wrapping a low-smoke halogen-free and highly flame-retardant wrapping tape. That is, the low-smoke halogen-free and highly flame-retardant wrapping tape is wrapped around the outer circumference of the filling layer 200 to form the protective layer 400. It should be noted that the low-smoke halogen-free and highly flame-retardant wrapping tape is wrapped in a continuous overlapping wrapping manner, and the thickness of the low-smoke halogen-free and highly flame-retardant wrapping tape is 0.2m, and the overlap rate is 10% to 20%. It should be noted that the low-smoke halogen-free highly flame-retardant wrapping tape has significant flame-retardant properties and environmentally friendly characteristics. This material is usually made of glass fiber cloth or other reinforcing materials, and its high flame-retardant properties are achieved by impregnating a halogen-free flame-retardant adhesive and curing it. It can be understood that through the above-mentioned settings, the protective layer 400 can significantly improve the flame-retardant properties of the self-supporting cable 1000, and can also play a good fixing role for the filling layer 200. At the same time, the glass fiber warp and weft in the low-smoke halogen-free highly flame-retardant wrapping tape can maintain a complete shape at high temperatures, forming a whole with the filling layer 200, protecting the ceramic shell formed by the filling layer 200, and maintaining the integrity of the self-supporting cable 1000.

[0037] Reference Figure 1 As shown, a self-supporting cable 1000 of an embodiment of the present invention, the core 120 includes a conductor 121 and an insulating layer 122. It should be noted that the insulating layer 122 is arranged on the outer peripheral side of the conductor 121. It should be noted that the insulating layer 122 plays an insulating and protective role for the conductor 121. In one embodiment, the insulating layer 122 is made of a ceramic polyolefin material. It should be noted that the insulating layer 122 is formed by extruding a ceramic polyolefin material. It should be noted that the extrusion thickness of the ceramic polyolefin material is 0.8mm to 2.5mm. It can be understood that the insulating layer 122 made of ceramic polyolefin material is rapidly sintered into a hard ceramic shell under a flameless high temperature of more than 500°C or a flame ablation of more than 620°C, preventing the flame from penetrating and burning into the interior of the cable, preventing the transfer of heat, and after the shell is formed, it can play a role in isolating the air and preventing the spread of the flame, thereby playing a good insulating and protective role for the conductor 121.

[0038] In one embodiment, the conductor 121 is a first-class annealed copper conductor or a second-class annealed copper conductor. That is, in one embodiment, the conductor 121 is a first-class annealed copper conductor. It should be noted that the first-class annealed copper conductor complies with the GB / T3956 standard, is a common annealed copper material that has undergone fine annealing treatment, has good flexibility and conductivity, and is an ideal material for the conductor 121. In another embodiment, the conductor 121 is a second-class annealed copper conductor. It should be noted that the second-class annealed copper conductor refers to a stranded conductor that complies with the GB / T3956 standard, and can be an annealed copper conductor without a metal layer or with a metal layer, and is an ideal material for the conductor 121.

[0039] Reference Figure 1 As shown, it should be noted that the core 120 also includes a fire-resistant layer 123. The fire-resistant layer 123 is arranged between the outer peripheral side of the conductor 121 and the inner peripheral side of the insulating layer 122. It should be noted that the fire-resistant layer 123 can further enhance the fire-resistant and flame-retardant properties of the core 120 and the self-supporting cable 1000. In one embodiment, the fire-resistant layer 123 is formed by wrapping a mica tape and a glass fiber tape around the outside of the conductor 121 in sequence. That is, the mica tape is wrapped around the outside of the conductor 121, and the glass fiber tape is wrapped around the outside of the mica tape to form the fire-resistant layer 123. It should be noted that the mica tape is a high-performance fire-resistant insulating material; the glass fiber tape is a strip material made of glass fiber, which has good insulation and flame retardancy.

[0040] It is understandable that the mica tape will release crystalline water at high temperatures, which can reduce the temperature of the conductor 121 and has excellent fire resistance. The mica tape itself has good electrical insulation properties, which can ensure that the cable still has good electrical insulation between the cores 120 under high-temperature combustion; but the mica tape after the fire is powdery and fragile. The glass fiber tape is wrapped around the outside of the mica tape. The glass fiber material can maintain its own shape at high temperatures, which can effectively protect the fragile mica tape and ensure that the mica tape can remain intact under vibration and spraying.

[0041] In one embodiment, both the mica tape and the glass fiber tape are wrapped around the conductor 121 in a continuous overlapping manner. It should be noted that in the continuous overlapping wrapping, the thickness of the mica tape is 0.14 mm, the overlap rate is 5% to 10%, and the thickness of the glass fiber tape is 0.2 mm, and the overlap rate is 10% to 20%. It can be understood that the fire-resistant effect of the fire-resistant layer 123 is further enhanced through the above-mentioned setting.

[0042] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-supporting cable, characterized in that include: The cable core comprises a support bar and a wire core, wherein the support bar has a plurality of support grooves arranged along its circumference, and the wire core is provided with a plurality of wire cores, and the plurality of wire cores are placed in the plurality of support grooves in a one-to-one correspondence; A filling layer is formed by extruding ceramic silica gel mud around the outer circumference of the cable core to stabilize the cable core on the supporting groove; The outer sheath is arranged on the outer peripheral side of the filling layer.

2. The self-supporting cable according to claim 1, characterized in that The support bar is made of ceramic polyolefin oxygen-insulating material.

3. The self-supporting cable according to claim 1, characterized in that The outer sheath is made of low-smoke, halogen-free, flame-retardant polyolefin sheath material.

4. The self-supporting cable according to claim 1, characterized in that It also includes a protective layer, which is arranged between the filling layer and the outer sheath and is formed by wrapping with a low-smoke, halogen-free and highly flame-retardant wrapping tape.

5. The self-supporting cable according to claim 1, characterized in that The wire core includes a conductor and an insulating layer, and the insulating layer is arranged on the outer peripheral side of the conductor.

6. The self-supporting cable according to claim 5, characterized in that The insulating layer is made of ceramic polyolefin material.

7. The self-supporting cable according to claim 5, characterized in that The conductor is a first type annealed copper conductor or a second type annealed copper conductor.

8. The self-supporting cable according to claim 5, characterized in that The wire core further includes a fire-resistant layer provided between an outer peripheral side of the conductor and an inner peripheral side of the insulating layer.

9. The self-supporting cable according to claim 8, characterized in that The fire-resistant layer is formed by wrapping a mica tape and a glass fiber tape around the conductor in sequence.

10. The self-supporting cable according to claim 9, characterized in that The mica tape and the glass fiber tape are both wrapped around the conductor in a continuous overlapping manner.

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