Waterproof, rat-proof, ant-proof, halogen-free and low-smoke B1-level shielding double-loop flexible cable

Abstract

The utility model discloses a waterproof, rat-proof and termite-proof halogen-free low-smoke B1-level shielding double-loop flexible cable, which comprises a cable core, the cable core is composed of two conductive units, an outer waterproof layer is arranged outside the cable core, a filling layer is filled in a gap between the two conductive units in the outer waterproof layer, an outer isolation layer is wrapped outside the outer waterproof layer, and an inner isolation layer is wrapped outside the outer isolation layer. The outer isolation layer is coated with a metal total shielding layer, the metal total shielding layer is coated with a flame-retardant oxygen-barrier layer, and the flame-retardant oxygen-barrier layer is coated with an outer protection layer. According to the double-loop flexible cable, on the premise that the combustion performance of a B1-level cable is guaranteed, the waterproof, rat-proof, termite-proof, flame-retardant, shielding and fire-resistant characteristics are added synchronously, so that the use requirements under complex working environment conditions are met, the double-loop design is adopted, secondary laying is avoided, and the service life of the cable is prolonged. The installation and laying time is saved, the occupied space is reduced, the problems that cables in equipment are numerous and difficult to overhaul are effectively solved, and the device is high in practicability, reasonable in design and worthy of application and popularization.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of power cable, specifically to a waterproof rat and termite prevention halogen-free low smoke B1 grade shielding double loop soft cable. BACKGROUND

[0002] As an important supporting industry of national economy, the power cable industry has been developing rapidly with the rapid development of national economy. The application of cables is becoming more and more widely. The cables used for transmitting power and control signals in daily life and production equipment are often bitten and damaged by rats and termites, which brings trouble to people's life and production, and even huge losses. At the same time, in some special use environments, such as washing machines, construction sites and underground drainage pipe networks, the use environment often comes into contact with water, even immersed in water for a long time, so many safety problems are caused. In addition, the existing cables are often laid and installed in multiple layers, which not only increases the laying workload, but also needs to be laid repeatedly, resulting in repeated labor, occupying a large laying space and increasing the laying cost.

[0003] For the safety transmission of power and signal cables for appliances, electronic equipment, automation devices and communication transmission with rated voltage of 450 / 750V and below, B1 grade cables are generally used as security cables. In the face of complex and harsh working environment, B1 grade cables used for security often have a series of unstable factors, such as when a fire occurs, the cable cannot work normally after being exposed to high temperature, and the addition of fireproof layer can effectively prolong the working time of the cable and increase the escape opportunity of personnel. During installation, maintenance or use, the wire will be dragged, so the flexibility of the wire is required to be improved, and the bending performance of the cable is enhanced to prolong the service life of the wire. Cable information transmission is easily disturbed by external interference, causing interruption of appliance signal, even short circuit, resulting in damage of appliance equipment, so the demand for cable shielding performance is put forward. Some cables are dragged during installation, maintenance or use, so the flexibility of the cable is required to be improved, and the bending performance of the cable is enhanced to prolong the service life. The flame retardance and fire resistance of the existing security cable need to be improved, which puts forward higher requirements for B1 grade cable.

[0004] According to the search, the patent literature with the authorization announcement number CN211087982U discloses a high-definition transmission double-loop signal line of graphics and text, the patent literature with the authorization announcement number CN220753133U discloses a double-shielded high-voltage direct-current soft cable, and the patent literature with the authorization announcement number CN214336377U discloses a special shielding waterproof soft cable. From the contents disclosed in the three patent literatures searched, a cable meeting the use requirements is provided from different angles. With the increase of existing security requirements, the matching cable products grow rapidly. In order to meet the use requirements, a cable different from the cables disclosed in the prior art is provided to meet the use requirements in complex and harsh working environment conditions, thereby improving the application range of security cables, which is particularly important. Content of the utility model

[0005] The technical problem to be solved by the utility model is to solve the problems in the background art, thereby providing a security cable with stable performance. By using the cable, the problem of cable damage caused by mouse and ant bites can be effectively avoided, and the flame retardation and fire resistance of the cable can be improved, thereby increasing the service life of the cable to meet the use requirements in complex and harsh working environment conditions. Specifically, it is a waterproof and mouse-proof halogen-free low-smoke B1-level shielding double-loop soft cable.

[0006] To solve the above technical problems, the utility model adopts the technical scheme that a waterproof and mouse-proof halogen-free low-smoke B1-level shielding double-loop soft cable comprises a cable core, the cable core is composed of two conductive units, an outer waterproof layer is arranged outside the cable core, a filling layer is filled in the gap between the two conductive units in the outer waterproof layer, an outer isolation layer is wrapped outside the outer waterproof layer, a metal total shielding layer is coated outside the outer isolation layer, a flame-retardant oxygen barrier layer is coated outside the flame-retardant oxygen barrier layer, and an outer protective layer is coated outside the flame-retardant oxygen barrier layer.

[0007] Further, the utility model discloses a waterproof and mouse-proof halogen-free low-smoke B1-level shielding double-loop soft cable, the conductive unit comprises a soft conductor, and an inner waterproof layer, a fire-resistant layer, an insulating layer, an inner isolation layer, a phase separation metal shielding layer and a phase separation isolation layer are sequentially coated outside the soft conductor from inside to outside; the two conductive units are twisted into a cable, the twisting direction is rightward, and the twisting pitch is not greater than 40 times of the outer diameter of the cable.

[0008] Further, the utility model discloses a waterproof and mouse-proof halogen-free low-smoke B1-level shielding double-loop soft cable, the soft conductor is twisted into a cable by the copper conductor of the sixth type in GB / T 3956-2008, the twisting direction is leftward, and the twisting pitch is not greater than 20 times of the outer diameter of the cable.

[0009] Further, the waterproof and rat-proof halogen-free low-smoke B1-grade shielding double-circuit flexible cable has the advantages that the inner waterproof layer is formed by double-layer wrapping of waterproof yarn; the fire-resistant layer is formed by double-layer wrapping of mica tape; the insulation layer is formed by extrusion wrapping of low-smoke halogen-free flame-retardant environment-friendly cross-linked polyolefin material; the inner isolation layer and the phase separation isolation layer are both formed by double-layer wrapping of polyester tape, and the wrapping coverage rate is not less than 30%; the phase separation metal shielding layer is formed by weaving of a plurality of oxygen-free copper monofilaments with a wire diameter not less than 0.10 mm, and the weaving density is not less than 80%; or the phase separation metal shielding layer is formed by overlapping wrapping of copper tapes with a thickness not less than 0.05 mm, and the wrapping coverage rate is not less than 15%.

[0010] Further, the waterproof and rat-proof halogen-free low-smoke B1-grade shielding double-circuit flexible cable has the advantages that the inner waterproof layer is formed by double-layer wrapping of waterproof yarn; the fire-resistant layer is formed by double-layer wrapping of mica tape; the insulation layer is formed by extrusion wrapping of low-smoke halogen-free flame-retardant environment-friendly cross-linked polyolefin material; the inner isolation layer and the phase separation isolation layer are both formed by double-layer wrapping of polyester tape, and the wrapping coverage rate is not less than 30%; the phase separation metal shielding layer is formed by weaving of a plurality of oxygen-free copper monofilaments with a wire diameter not less than 0.10 mm, and the weaving density is not less than 80%; or the phase separation metal shielding layer is formed by overlapping wrapping of copper tapes with a thickness not less than 0.05 mm, and the wrapping coverage rate is not less than 15%.

[0011] Further, the waterproof and rat-proof halogen-free low-smoke B1-grade shielding double-circuit flexible cable has the advantages that the inner waterproof layer is formed by double-layer wrapping of waterproof yarn; the fire-resistant layer is formed by double-layer wrapping of mica tape; the insulation layer is formed by extrusion wrapping of low-smoke halogen-free flame-retardant environment-friendly cross-linked polyolefin material; the inner isolation layer and the phase separation isolation layer are both formed by double-layer wrapping of polyester tape, and the wrapping coverage rate is not less than 30%; the phase separation metal shielding layer is formed by weaving of a plurality of oxygen-free copper monofilaments with a wire diameter not less than 0.10 mm, and the weaving density is not less than 80%; or the phase separation metal shielding layer is formed by overlapping wrapping of copper tapes with a thickness not less than 0.05 mm, and the wrapping coverage rate is not less than 15%.

[0012] Further, the waterproof and rat-proof halogen-free low-smoke B1-grade shielding double-circuit flexible cable has the advantages that the inner waterproof layer is formed by double-layer wrapping of waterproof yarn; the fire-resistant layer is formed by double-layer wrapping of mica tape; the insulation layer is formed by extrusion wrapping of low-smoke halogen-free flame-retardant environment-friendly cross-linked polyolefin material; the inner isolation layer and the phase separation isolation layer are both formed by double-layer wrapping of polyester tape, and the wrapping coverage rate is not less than 30%; the phase separation metal shielding layer is formed by weaving of a plurality of oxygen-free copper monofilaments with a wire diameter not less than 0.10 mm, and the weaving density is not less than 80%; or the phase separation metal shielding layer is formed by overlapping wrapping of copper tapes with a thickness not less than 0.05 mm, and the wrapping coverage rate is not less than 15%.

[0013] Further, the waterproof and rat-proof halogen-free low-smoke B1-grade shielding double-circuit flexible cable has the advantages that the inner waterproof layer is formed by double-layer wrapping of waterproof yarn; the fire-resistant layer is formed by double-layer wrapping of mica tape; the insulation layer is formed by extrusion wrapping of low-smoke halogen-free flame-retardant environment-friendly cross-linked polyolefin material; the inner isolation layer and the phase separation isolation layer are both formed by double-layer wrapping of polyester tape, and the wrapping coverage rate is not less than 30%; the phase separation metal shielding layer is formed by weaving of a plurality of oxygen-free copper monofilaments with a wire diameter not less than 0.10 mm, and the weaving density is not less than 80%; or the phase separation metal shielding layer is formed by overlapping wrapping of copper tapes with a thickness not less than 0.05 mm, and the wrapping coverage rate is not less than 15%.

[0014] Further, the waterproof and rat-proof halogen-free low-smoke B1-grade shielding double-circuit flexible cable has the advantages that the inner waterproof layer is formed by double-layer wrapping of waterproof yarn; the fire-resistant layer is formed by double-layer wrapping of mica tape; the insulation layer is formed by extrusion wrapping of low-smoke halogen-free flame-retardant environment-friendly cross-linked polyolefin material; the inner isolation layer and the phase separation isolation layer are both formed by double-layer wrapping of polyester tape, and the wrapping coverage rate is not less than 30%; the phase separation metal shielding layer is formed by weaving of a plurality of oxygen-free copper monofilaments with a wire diameter not less than 0.10 mm, and the weaving density is not less than 80%; or the phase separation metal shielding layer is formed by overlapping wrapping of copper tapes with a thickness not less than 0.05 mm, and the wrapping coverage rate is not less than 15%.

[0015] Further, the waterproof and rat-proof halogen-free low-smoke B1-grade shielding double-circuit flexible cable has the advantages that the inner waterproof layer is formed by double-layer wrapping of waterproof yarn; the fire-resistant layer is formed by double-layer wrapping of mica tape; the insulation layer is formed by extrusion wrapping of low-smoke halogen-free flame-retardant environment-friendly cross-linked polyolefin material; the inner isolation layer and the phase separation isolation layer are both formed by double-layer wrapping of polyester tape, and the wrapping coverage rate is not less than 30%; the phase separation metal shielding layer is formed by weaving of a plurality of oxygen-free copper monofilaments with a wire diameter not less than 0.10 mm, and the weaving density is not less than 80%; or the phase separation metal shielding layer is formed by overlapping wrapping of copper tapes with a thickness not less than 0.05 mm, and the wrapping coverage rate is not less than 15%.

[0016] The utility model relates to a kind of waterproof rat-proof ant-proof halogen-free low-smoke B1 level shielding double-loop flexible cable, since cable core adopts two electrically-conductive units hinge, and soft conductor in electrically-conductive unit adopts the hinge of the conductor in GB / T 3956-2008 No.6, and inside from inside to outside in soft conductor outer cover has inner waterproof layer, fire resistance layer, insulating layer, inner isolation layer, phase separation metal shielding layer and phase separation isolation layer;Meanwhile, outer waterproof layer is arranged outside the cable core, and filling layer is filled in outer waterproof layer, and outer isolation layer, metal total shielding layer, flame-retardant oxygen barrier layer and outer protective layer are sequentially arranged outside the outer waterproof layer.By the above structure, not only can the cable have high softness, which can greatly improve the bending performance of the cable, increase the service life of the wire, and be easy to use;It also has waterproof property, rat-proof and ant-proof property, so that the cable can be more durable and safe in special use environment, thereby reducing unnecessary maintenance cost and time cost;It also has flame-retardant and fire-resistant properties, which can effectively retard flame or prolong the normal working time of the cable in a fire state, so that the cable can still transmit electric energy normally within a certain time, ensuring that the electric devices such as lighting and fire alarm can continue to be powered within a certain time, and more time is gained for subsequent remediation and rescue work.

[0017] Therefore, the double-loop flexible cable of the utility model can meet the use requirements in complex working environment conditions while ensuring the B1 level cable burning performance, which not only facilitates construction, but also reduces the space occupation and repeated operation of the cable, and has the characteristics of easy to use, safe and environmentally friendly.Compared with traditional cables, the double-loop design avoids secondary laying, saves installation and laying time and space, effectively avoids the problems of too many cables in equipment and difficult maintenance, and is practical, reasonable in design and worthy of promotion. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model will be further described in detail below with reference to the drawings.

[0019] Figure 1 It is the structure schematic diagram of the utility model;

[0020] Figure 2 It is the structure schematic diagram of the electrically-conductive unit in the utility model.

[0021] As shown in the figure: 1-soft conductor, 2-inner waterproof layer, 3-fire resistance layer, 4-insulating layer, 5-inner isolation layer, 6-phase separation metal shielding layer, 7-phase separation isolation layer, 8-filling layer, 9-outer waterproof layer, 10-outer isolation layer, 11-metal total shielding layer, 12-flame-retardant oxygen barrier layer, 13-outer protective layer. DETAILED DESCRIPTION

[0022] The following embodiments of the present application will be described in detail with specific examples. Those skilled in the art can easily understand other advantages and functions of the present application from the contents disclosed in the specification.

[0023] It should be noted that the structures, proportions, sizes, etc. shown in the drawings of the specification are merely intended to facilitate the understanding of the contents disclosed in the specification for those skilled in the art, and are not intended to limit the conditions under which the present application can be implemented. Therefore, they do not have technical significance. Any modification of the structure, change of the proportion relationship, or adjustment of the size, which does not affect the functions and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "up", "down", "left", "right", etc. cited in the specification are only for the convenience of clear description, and are not intended to limit the scope of the present application. The change or adjustment of the relative relationship without substantial change of the technical content is also considered as the scope of the present application.

[0024] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "provided with" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] It should be noted that the term "comprising" or any other variant is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Example 1

[0026] As Figure 1 and Figure 2As shown, the embodiment provides a waterproof, rat-proof, ant-proof, halogen-free, low-smoke, B1-level shielding double-circuit flexible cable, which comprises a cable core composed of two conductive units, an outer waterproof layer 9 arranged outside the cable core, a filling layer 8 filled in the gap between the two conductive units inside the outer waterproof layer 9, an outer isolation layer 10 wrapped outside the outer waterproof layer 9, a metal total shielding layer 11 wrapped outside the outer isolation layer 10, a flame-retardant oxygen barrier layer 12 wrapped outside the metal total shielding layer 11, and an outer protective layer 13 wrapped outside the flame-retardant oxygen barrier layer 12. The conductive unit comprises a soft conductor 1, which is wrapped from inside to outside with an inner waterproof layer 2, a fire-resistant layer 3, an insulation layer 4, an inner isolation layer 5, a phase separation metal shielding layer 6, and a phase separation isolation layer 7. The two conductive units are twisted into a cable, the twisting direction is rightward, and the twisting pitch is not greater than 40 times the outer diameter of the cable.

[0027] In the specific manufacturing process of the double-circuit flexible cable, the soft conductor 1 is twisted into a cable by using the 6th conductor in GB / T3956-2008, the twisting direction is leftward, and the twisting pitch is not greater than 20 times the outer diameter of the cable. In this way, the needs of different occasions can be met. Since the 6th single wire is thinner than the 2nd and 5th single wires, it has better flexibility, longer bending life, is easier to lay, and has increased conductor strength. In this way, the bending performance of the B1-level cable can be improved, and the cable is not easy to be damaged. In addition, the use life of the 6th copper conductor can be effectively prolonged.

[0028] The inner waterproof layer 2 is double-wrapped by waterproof yarn, the wrapping direction is opposite to the twisting direction of the soft conductor 1, and the coverage rate is not less than 30%. The outer waterproof layer 9 is double-wrapped by semi-conductive water-resistant tape, the wrapping direction is opposite to the cable twisting direction of the conductor, and the coverage rate is not less than 30%. The double waterproof structure can improve the waterproof performance of the cable.

[0029] The fire-resistant layer 3 is double-wrapped by mica tape, the mica tape is calcined mica tape, the wrapping direction is opposite to the conductor twisting direction, and the coverage rate is not less than 25%.

[0030] The insulation layer 4 is extruded by low-smoke halogen-free flame-retardant environmentally friendly cross-linked polyolefin material, the insulation thickness meets the standard requirements, and different colors can be used to identify during preparation.

[0031] The inner isolation layer 5, the phase separation isolation layer 7, and the outer isolation layer 10 are all double-wrapped by polyester tape, and the wrapping coverage rate is not less than 30%. The polyester tape is a non-hygroscopic wrapping material and has good flame-retardant performance. The three-layer isolation structure can improve the flame-retardant performance of the cable.

[0032] The phase-separated metal shielding layer 6 and the metal overall shielding layer 11 are both woven from multiple oxygen-free copper monofilaments with a wire diameter of not less than 0.10 mm. Several monofilaments are firstly paralleled and then braided for shielding, and the braiding density is not less than 80%;

[0033] The filling layer 8 is made of mineral-filled rope, which is used to fill the twisted gaps, replacing the existing rock wool rope, filling the cable core into a round, dense structure. Because this material not only does not harm the health of employees during production but also decomposes naturally when discarded, without generating a large amount of pollutants, environmental protection requirements are taken into consideration in product design.

[0034] The flame-retardant oxygen-insulating layer 12 is formed by overlapping halogen-free, low-smoke, highly flame-retardant tape, with an oxygen index of no less than 65 and an overlap ratio of no less than 30%. The halogen-free, low-smoke, highly flame-retardant tape is a commonly used flame-retardant oxygen-insulating material for cables and can be purchased directly from the market.

[0035] The outer sheath 13 is made of B1 environmentally friendly low-smoke halogen-free polyolefin material by extrusion. B1 environmentally friendly low-smoke halogen-free polyolefin material is the mainstream material currently used for cable materials. It has good flame retardancy and is a commonly used flame retardant material for existing cables. It can be directly purchased in the market. Example 2

[0036] The structure of the double-circuit flexible cable described in this embodiment is basically the same as that of embodiment 1, except that the phase-separated metal shielding layer 6 and the metal overall shielding layer 11 are formed by overlapping and wrapping copper tape with a thickness of not less than 0.05mm, and the wrapping coverage rate is not less than 15%. When using copper tape as the shielding layer, the metal surface of the composite tape should face inward, and the wrapping layer should be flat and not leak. At the same time, a copper tape with a nominal cross-section of not less than 0.2mm can be placed under the copper tape. 2 Drainage line.

[0037] Regardless of whether the shielding form woven from oxygen-free copper monofilaments of Example 1 or the copper tape shielding form of Example 2 is adopted, it is required that the sub-screens and the sub-screens, as well as the sub-screens and the overall screen, should be unified. By adopting a double-layer shielding structure, the purpose is to better meet the transmission performance of the two conductive units.

[0038] The utility model relates to a kind of waterproof rat-proof ant-proof halogen-free low-smoke B1 level shielding double-circuit flexible cable, since cable core adopts two electrically conductive units hinge, and soft conductor 1 in electrically conductive unit adopts hinge in GB / T 3956-2008 type 6 conductor, and inside from inside to outside in soft conductor 1 is covered with inner waterproof layer 2, fire resistance layer 3, insulation layer 4, inner isolation layer 5, phase separation metal shielding layer 6 and phase separation isolation layer 7;Meanwhile, outer waterproof layer 9 is arranged outside the cable core, and filling layer 8 is filled in outer waterproof layer 9, and outer isolation layer 10, metal total shielding layer 11, fire-retardant oxygen barrier layer 12 and outer protective layer 13 are sequentially arranged outside the outer waterproof layer 9.By the above structure, not only can the cable have high softness, which can greatly improve the bending performance of the cable, increase the service life of the wire, and be easy to use;It also has waterproof properties, rat-proof and ant-proof properties, so that the cable can be more durable and safe in special use environment, thereby reducing unnecessary maintenance costs and time costs;It also has fire-retardant and fire-resistant properties, which can effectively retard flame or prolong the normal working time of the cable in a fire state, so that the cable can still transmit electric energy normally within a certain time, ensuring that the lighting and fire alarm electrical devices can continue to be powered within a certain time, and more time is gained for subsequent remediation and rescue work.

[0039] Therefore, the double-circuit flexible cable of the utility model can increase the waterproof, rat-proof, ant-proof, fire-resistant and fire-retarding properties of the cable while ensuring that it meets the B1 level cable combustion performance. On this basis, especially the soft conductor 1 uses super-soft conductor, i.e. type 6 conductor in GB / T 3956-2008, which has more softness than the type 1, type 2 and type 5 conductors in ordinary B1 level cables, can greatly improve the bending frequency and service life of the cable, and facilitate construction. The inner waterproof layer 2 outside the soft conductor 1 uses two layers of waterproof yarn, which can increase the waterproof performance of the cable. The fire resistance layer 3 uses a two-layer mica tape wrapping structure, and the mica tape uses calcined mica tape material. Since this material structure can make the cable continue to operate stably for a certain time in case of fire, it not only increases the escape opportunity of personnel, but also prolongs the electric energy transmission time of the cable, effectively enhancing the fire resistance of the cable. In addition, the double-layer shielding structure combining the phase separation metal shielding layer 6 and the metal total shielding layer 11 can better meet the transmission performance of the two electrically conductive units, so as to enhance the shielding performance.

[0040] In conclusion, the double circuit soft cable of the utility model, under the premise of guaranteeing the cable combustion performance of B1 level, simultaneously increases the waterproof, rat and termite prevention, flame retardance, shielding and fire resistance of the cable, so as to satisfy the use requirement under the complex working environment condition, not only facilitates construction, but also reduces the space occupation and repeated operation of the cable and other problems, has the characteristics of simple use, safety and environmental protection and the like.

[0041] The other parts not described in detail of the utility model are the conventional technology known by the person skilled in the art.

[0042] The protection scope of the utility model is not limited to the technical scheme disclosed in the specific embodiment, and the above description is only the preferred embodiment of the utility model, and does not limit the utility model, and any slight modification, equivalent replacement and improvement according to the technical scheme of the utility model should be included in the protection scope of the technical scheme of the utility model.

Claims

1. A waterproof, rat and ant proof, halogen-free, low smoke, B1 rated, shielded, dual circuit flexible cable comprising a cable core, characterised in that: The cable core is composed of two conductive units, an outer waterproof layer (9) is arranged outside the cable core, a filling layer (8) is filled in the gap between the two conductive units in the outer waterproof layer (9), an outer isolation layer (10) is wrapped outside the outer waterproof layer (9), a metal total shielding layer (11) is wrapped outside the outer isolation layer (10), a flame-retardant oxygen barrier layer (12) is wrapped outside the metal total shielding layer (11), and an outer protective layer (13) is wrapped outside the flame-retardant oxygen barrier layer (12).

2. The waterproof, rat-proof, ant-proof, halogen-free, low-smoke, B1 -rated, shielded, double-circuit flexible cable according to claim 1, characterized in that: The conductive unit comprises a soft conductor (1), and an inner waterproof layer (2), a fire-resistant layer (3), an insulation layer (4), an inner isolation layer (5), a phase separation metal shielding layer (6) and a phase separation isolation layer (7) are sequentially wrapped outside the soft conductor (1) from inside to outside; the two conductive units are twisted into a cable, the twisting direction is right, and the twisting pitch is not greater than 40 times of the cable outer diameter.

3. The waterproof, rodent and termite proof, halogen-free, low smoke, B1 rated, shielded, dual circuit flexible electrical cable of claim 2, wherein: The soft conductor (1) is made of copper conductor of the 6th type in GB / T 3956-2008, the twisting direction is left, and the twisting pitch is not greater than 20 times of the cable outer diameter.

4. The waterproof, rodent and termite proof, halogen-free, low smoke, B1 rated, shielded, dual circuit flexible electrical cable of claim 2, wherein: The inner waterproof layer (2) is double-wrapped with waterproof yarn; The fire-resistant layer (3) is double-wrapped with mica tape; The insulation layer (4) is extruded with low-smoke halogen-free flame-retardant environmentally friendly cross-linked polyolefin material; The inner isolation layer (5) and the phase separation isolation layer (7) are both double-wrapped with polyester tape, and the wrapping overlap rate is not less than 30%; The phase separation metal shielding layer (6) is woven with multiple oxygen-free copper monofilaments with a wire diameter of not less than 0.10 mm, and the weaving density is not less than 80%; or is double-wrapped with overlapping copper tape with a thickness of not less than 0.05 mm, and the wrapping overlap rate is not less than 15%.

5. The waterproof, rodent and termite proof, halogen-free, low smoke, B1 rated, shielded, dual circuit flexible cable of claim 1, wherein: The filling layer (8) is filled with mineral filling rope.

6. The waterproof, rodent and termite resistant, halogen-free, low smoke, B1 rated, shielded, dual circuit flexible electrical cable of claim 1, wherein: The outer waterproof layer (9) is double-wrapped with semi-conductive water-blocking tape.

7. The waterproof, rodent and termite proof, halogen-free, low smoke, B1 rated, shielded, dual circuit flexible cable of claim 1, wherein: The outer isolation layer (10) is double-wrapped with polyester tape, and the wrapping overlap rate is not less than 30%.

8. The waterproof, rodent and termite resistant, halogen-free, low smoke, B1 rated, shielded, dual circuit flexible electrical cable of claim 1, wherein: The metal total shielding layer (11) is woven with multiple oxygen-free copper monofilaments with a wire diameter of not less than 0.10 mm, and the weaving density is not less than 80%; or is double-wrapped with overlapping copper tape with a thickness of not less than 0.05 mm, and the wrapping overlap rate is not less than 15%.

9. The waterproof, rodent and termite resistant, halogen-free, low smoke, B1 rated, shielded, dual circuit flexible electrical cable of claim 1, wherein: The flame-retardant oxygen barrier layer (12) is double-wrapped with overlapping halogen-free low-smoke high-flame-retardant tape, and the wrapping overlap rate is not less than 30%.

10. The waterproof, rodent and termite resistant, halogen-free, low smoke, B1 rated, shielded, dual circuit flexible electrical cable of claim 1, wherein: The outer protective layer (13) is extruded with B1-level environmentally friendly low-smoke halogen-free polyolefin material.

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