Fire-resistant cable for mobile occasions

Abstract

The utility model discloses a fire-resistant cable for mobile occasions, which comprises a cable core, a flame-retardant belt and an outer sheath which are arranged from inside to outside, the cable core is composed of at least two conductor units and a filler, and the filler is arranged in a gap between the conductor units; each conductor unit comprises a conductor, a fireproof layer and an insulating layer which are arranged from inside to outside; the fireproof layer comprises soft fireproof fiber belts and calcined mica belts which are arranged in a staggered mode, and fireproof fiber belts are arranged on the inner sides and the outer sides of the calcined mica belts. According to the utility model, the fireproof layer adopts a sandwich structure, on one hand, the soft fireproof fiber tape has fireproof performance not lower than 1000 DEG C and can reduce the heating temperature of the mica tape, and on the other hand, the soft fireproof fiber tape has excellent compressibility and rebound resilience and can effectively isolate and buffer the friction force between the calcined mica tapes in the moving process of the cable, so that the service life of the cable is prolonged. And the shrinkage between the mica tapes in the moving process of the cable can be counteracted, and the mechanical damage of the mica tapes in the moving process of the cable is reduced, so that the reliability of the fireproof cable is improved.

Description

Technical Field

[0001] The utility model relates to a fire-resistant cable for mobile occasions, belonging to the field of cables. Background Art

[0002] With the continuous development of the economy, the demand for electrification is increasing. In the process of electrification transformation of various equipment, various places with dense traffic, such as high-rise commercial buildings, exhibition centers, stadiums, museums and hospitals, need to use a large number of cables. Their electrical safety is of great importance. Fire-resistant cables play a major role in ensuring the smooth operation of safety systems during fires. Their fire resistance directly determines the operation of fire protection systems, emergency lighting, evacuation signs and key communication equipment. The control cables in the existing fire-resistant instruments can only play a fixed laying role. They generally adopt a structure in which the fire-resistant mica tape is wrapped around the outside of the conductor. When the cable needs to be moved in an emergency, the mica tape wrapped around the outside of the conductor often falls off, and the fire-resistant cable fails, which eventually causes the instruments to fail to work, causing a major impact on disaster relief work.

[0003] Based on the above background, how to develop fire-resistant cables for various mobile occasions has become a technical problem that needs to be solved urgently. Utility Model Content

[0004] The utility model aims to provide a fire-resistant cable for mobile occasions.

[0005] The technical solution to achieve the purpose of the utility model is: a fire-resistant cable for mobile occasions, characterized in that it includes a cable core, a flame retardant tape and an outer sheath arranged from the inside to the outside, wherein the cable core is composed of at least two conductor units and a filling, and the filling is arranged in the gap between the conductor units;

[0006] The conductor unit includes a conductor, a fire-resistant layer and an insulating layer arranged from inside to outside;

[0007] The refractory layer comprises soft refractory fiber belts and calcined mica belts which are arranged in a staggered manner, and both the inner and outer sides of the calcined mica belts are refractory fiber belts.

[0008] The refractory layer of the utility model adopts a sandwich structure made of soft refractory fiber tape and calcined mica tape. The soft refractory fiber tape has a refractory performance of not less than 1000°C on the one hand, which can reduce the heating temperature of the mica tape. On the other hand, it has excellent compressibility and resilience, which can effectively isolate the friction between the calcined mica tapes during the movement of the buffer cable, and can also offset the shrinkage between the mica tapes during the movement of the cable, reduce the mechanical damage of the mica tape during the movement of the cable, thereby improving the reliability of the fire-resistant cable.

[0009] In order to achieve the purpose of fire prevention while saving materials, the refractory layer is designed as a 5-layer structure, which from the inside to the outside are the first soft refractory fiber belt, the first calcined mica belt, the second soft refractory fiber belt, the second calcined mica belt, and the third soft refractory fiber belt.

[0010] In order to reduce the mechanical friction of the conductor on the refractory fiber belt and extend the service life of the refractory fiber belt, the soft refractory fiber belt is a single-sided synthetic polyester soft refractory fiber belt, and the polyester surface is arranged inwardly.

[0011] In order to improve the softness of the cable and make it more flexible in use, the conductor is a fifth-category soft conductor.

[0012] In order to reduce the smoke release during the combustion of the cable, the outer sheath is a low-smoke halogen-free flame-retardant irradiated CPE sheath.

[0013] In order to effectively control the size of the cable outer diameter while reducing costs, the low-smoke halogen-free flame-retardant irradiated CPE sheath is prepared by an extrusion and irradiation production process.

[0014] In order to improve the aging resistance of the cable, the insulation layer of the conductor unit is EPR ethylene propylene rubber.

[0015] In order to further reduce the smoke release during cable combustion, the flame retardant tape is a low-smoke halogen-free flame retardant tape.

[0016] By adopting the above technical solution, the utility model has the following beneficial effects:

[0017] (1) The fire-resistant layer of the utility model adopts a sandwich structure made of soft refractory fiber tape and calcined mica tape. The soft refractory fiber tape has a fire-resistant performance of not less than 1000°C on the one hand, which can reduce the heating temperature of the mica tape. On the other hand, it has excellent compressibility and resilience, which can effectively isolate the friction between the calcined mica tapes during the movement of the buffer cable, and can also offset the shrinkage between the mica tapes during the movement of the cable, reduce the mechanical damage of the mica tape during the movement of the cable, and thus improve the reliability of the fire-resistant cable.

[0018] (2) The fire-resistant layer of the utility model adopts a five-layer sandwich structure, which can save materials to the greatest extent while achieving high performance.

[0019] (3) The polyester surface of the soft refractory fiber belt of the utility model is arranged to face inward, which can effectively reduce the mechanical friction force of the conductor on the refractory fiber belt and extend the service life of the refractory fiber belt.

[0020] (4) The utility model adopts the fifth type of conductor, which is more flexible and more flexible in use.

[0021] (5) The outer sheath of the utility model is a low-smoke, halogen-free, flame-retardant, irradiated CPE sheath, which can reduce the amount of smoke released by the cable during combustion.

[0022] (6) The low-smoke, halogen-free, flame-retardant, irradiated CPE sheath of the utility model is prepared by an extrusion and irradiation production process, which has lower production costs and higher dimensional accuracy.

[0023] (7) The insulating layer of the utility model is EPR ethylene propylene rubber, which has better aging resistance.

[0024] (8) The flame retardant tape of the utility model is a low-smoke halogen-free flame retardant tape, which releases less smoke during cable combustion and has better safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.

[0026] Figure 1 It is a structural schematic diagram of the utility model.

[0027] The reference numerals in the accompanying drawings are:

[0028] Cable core 1, conductor unit 11, conductor 111, fire-resistant layer 112, insulation layer 113, filling 12, flame retardant tape 2, outer sheath 3. DETAILED DESCRIPTION

[0029] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] In the description of the embodiments of the present utility model, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present utility model.

[0034] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly stipulated and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the scope of protection of the utility model.

[0035] (Example 1)

[0036] See Figure 1 , a fire-resistant cable for mobile occasions of this embodiment comprises a cable core 1, a flame retardant tape 2 and an outer sheath 3 arranged from inside to outside, wherein the cable core 1 is composed of at least two conductor units 11 and a filler 12, and the filler 12 is arranged in the gap between the conductor units 11;

[0037] The conductor unit 11 includes a conductor 111, a fire-resistant layer 112 and an insulating layer 113 arranged from inside to outside;

[0038] The refractory layer 112 includes soft refractory fiber belts and calcined mica belts that are staggered, and both the inner and outer sides of the calcined mica belts are refractory fiber belts.

[0039] During preparation, the conductor 111 of the cable core (1) adopts the fifth type of conductor, and the outer side is overlapped and wrapped with a refractory layer 112 in sequence. The refractory layer 112 is composed of a first soft refractory fiber tape, a first calcined mica tape, a second soft refractory fiber tape, a second calcined mica tape, and a third soft refractory fiber tape from the inside to the outside. The third soft refractory fiber tape is extruded with an insulating layer 113. The insulating layer 113 is made of EPR ethylene propylene rubber. Then the cable core 1 is twisted into a cable. During the twisting process, a filler 12 is added. The filler 12 is made of cotton rope. The cable core 1 is overlapped and wrapped with a flame retardant tape 2. The flame retardant tape 2 is made of halogen-free and low-smoke material. The flame retardant tape 2 is extruded with an outer sheath 3. The outer sheath 3 is made of low-smoke halogen-free flame retardant irradiated CPE material.

[0040] The soft refractory fiber belt is a single-sided synthetic polyester soft refractory fiber belt. During the wrapping process, the polyester surface should be oriented inward to prevent the conductor 111 from scratching the soft refractory fiber belt.

[0041] In order to solve the material problem, realize precise control of cable radius and save production process, the low-smoke halogen-free flame-retardant irradiated CPE sheath is produced by extrusion and irradiation production process.

[0042] In terms of material selection, the insulating layer 113 of the conductor unit 11 is made of EPR ethylene propylene rubber, and the flame retardant tape 2 is made of low-smoke halogen-free flame retardant material.

[0043] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fire-resistant cable for mobile applications, characterized in that: The cable core (1), a flame retardant tape (2) and an outer sheath (3) are arranged from the inside to the outside, wherein the cable core (1) is composed of at least two conductor units (11) and a filler (12), and the filler (12) is arranged in the gap between the conductor units (11); The conductor unit (11) comprises a conductor (111), a fire-resistant layer (112) and an insulating layer (113) arranged from inside to outside; The refractory layer (112) comprises soft refractory fiber belts and calcined mica belts arranged in an alternating manner, and both the inner and outer sides of the calcined mica belts are refractory fiber belts.

2. A fire-resistant cable for mobile use according to claim 1, characterized in that: The refractory layer (112) has a five-layer structure, which, from the inside to the outside, comprises a first soft refractory fiber belt, a first calcined mica belt, a second soft refractory fiber belt, a second calcined mica belt, and a third soft refractory fiber belt.

3. A fire-resistant cable for mobile use according to claim 1 or 2, characterized in that: The soft fire-resistant fiber belt is a single-sided synthetic polyester soft fire-resistant fiber belt, and the polyester surface of the soft fire-resistant fiber belt faces inward.

4. A fire-resistant cable for mobile use according to claim 1 or 2, characterized in that: The conductor (111) is a fifth-category soft conductor.

5. A fire-resistant cable for mobile use according to claim 1 or 2, characterized in that: The outer sheath (3) is a low-smoke, halogen-free, flame-retardant, irradiated CPE sheath.

6. A fire-resistant cable for mobile use according to claim 5, characterized in that: The low-smoke, halogen-free, flame-retardant, irradiated CPE sheath is prepared by adopting an extrusion and irradiation production process.

7. A fire-resistant cable for mobile use according to claim 1 or 2, characterized in that: The insulating layer (113) of the conductor unit (11) is EPR ethylene propylene rubber.

8. A fire-resistant cable for mobile use according to claim 1 or 2, characterized in that: The flame retardant tape (2) is a low-smoke halogen-free flame retardant tape.

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