High-density shielding, fireproof and high-flexibility frequency converter cable

Abstract

The utility model relates to the technical field of power electric signal transmission and communication transmission, in particular to a high-density shielding, fire-resistant and high-flexibility frequency converter cable, which comprises a mechanical structure combination layer formed by a multi-layer coaxial coating structure, and a hollow and circular accommodating cavity is formed on an orthogonal section in the length direction of the mechanical structure combination layer; a plurality of strands of wire cores wrapped in the accommodating cavity; the accommodating cavity is filled with the flame-retardant filling ropes which are not covered by the wire cores; the cable core, the flame-retardant filling rope, the wrapping layer, the shielding layer and the fire-resistant jacket layer are arranged, so that the fire-resistant performance of the cable is remarkably enhanced; by optimizing the position structures of the wire cores and the flame-retardant filling ropes, the wrapping compactness of the mechanical structure combination layer is improved, and meanwhile, the wire cores can be fully isolated by the flame-retardant filling ropes 4, so that flame is difficult to spread among the multiple strands of wire cores.

Description

Technical Field

[0001] The utility model relates to the technical field of power signal transmission and communication transmission, and in particular to a high-density shielded, fire-resistant and highly flexible frequency converter cable. Background Art

[0002] As a transmission device for electric energy or signals, cables will emit electromagnetic waves during transmission, which will affect the surrounding environment. The existing market uses shielding materials in cables to shield mutual influence on the outside world. The bending of the cable will cause wear on the shielding material. There is a lack of a cable that can shield electromagnetic waves and is soft and wear-resistant. At the same time, the existing inverter cables are generally only suitable for places with good environments to provide transmission of electric energy and signals. However, in a fire environment, the fire resistance of the cable is greatly reduced, and the transmission of signals and data cannot be guaranteed; therefore, in order to change the inverter cable to work stably in a short time in a fire environment and create more time for rescuing personnel or materials, it is necessary to improve the cable structure so that it can be used in more occasions. Utility Model Content

[0003] 1. Technical issues to be solved

[0004] The purpose of the utility model is to provide a high-density shielded, fire-resistant, highly flexible inverter cable, which has strong fire-resistant and flame-retardant properties while maintaining flexibility and high shielding effect, and is suitable for use in flammable places such as oil and gas drilling, construction, and power plants.

[0005] 2. Technical Solution

[0006] The utility model is realized by the following technical solutions:

[0007] The utility model proposes a high-density shielded, fire-resistant, high-flexibility inverter cable, comprising:

[0008] A mechanical structure composite layer formed by a multi-level coaxial coating structure, wherein the mechanical structure composite layer forms a hollow, circular accommodating cavity in a cross section orthogonal to its length direction;

[0009] A plurality of wire cores are wrapped in a receiving cavity;

[0010] A plurality of flame retardant filling ropes are filled in the accommodating cavity and in the non-core covered area.

[0011] Furthermore, the cores are evenly distributed in the circumferential direction, and the number of the cores is at least 4, the number of the flame retardant filling ropes is not less than the number of the cores, and the flame retardant filling ropes are at least filled in the accommodating cavity between adjacent cores.

[0012] Furthermore, the outer peripheral surfaces of the adjacent cores are tangent to each other, and all the cores are inscribed in the innermost wall surface of the mechanical structure assembly layer.

[0013] Furthermore, in a section orthogonal to the length direction of the core, the centers of all the cores are located at the vertices of a virtual regular polygon, a flame retardant filling rope is arranged at the center of each core, and the center of the flame retardant filling rope coincides with the center of the virtual polygon.

[0014] Furthermore, a flame retardant filling rope is arranged between adjacent wire cores and the innermost wall of the mechanical structure combination layer, and the outer peripheral surface of the flame retardant filling rope is circumscribed with the two adjacent wire cores and inscribed with the innermost wall of the mechanical structure combination layer.

[0015] Furthermore, the mechanical structure composite layer includes a wrapping layer, a shielding layer and a fire-resistant jacket layer which are coaxially arranged in sequence from the inside to the outside; wherein, the wrapping layer adopts a ceramic fire-resistant composite tape wrapped around the wire core and the outside of the flame-retardant filling rope, and the shielding layer adopts a tinned copper wire shielding copper mesh woven with tinned fine round copper wire with a nominal diameter of 0.20 mm, and its weaving density is not less than 90%; the fire-resistant jacket layer adopts a flame-retardant thermoplastic elastomer material, which is extruded on the outside of the shielding layer.

[0016] Furthermore, the flame retardant filling rope is made of flame retardant inorganic paper rope.

[0017] Furthermore, the wire core comprises, from the inside to the outside, a soft copper conductor, a fire-resistant fluorphlogopite tape, and a flame-retardant polyvinyl chloride insulation layer which are coaxially arranged in sequence; wherein the outside of the soft copper conductor is coated with at least one layer of fire-resistant fluorphlogopite tape, and the flame-retardant polyvinyl chloride insulation layer is extruded onto the outside of the outermost fire-resistant fluorphlogopite tape.

[0018] Furthermore, the soft copper conductor is a soft copper structure that complies with the 6th type structure in GB / T3956.

[0019] 3. Beneficial Effects

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. In the utility model, the wire core, flame-retardant filling rope, sheath, shielding layer and fire-resistant outer jacket layer, this structure significantly enhances the fire resistance of the cable; the sheath is shielded by tinned copper wire braid, which can not only prevent corrosion but also effectively prevent electromagnetic interference to other cables or equipment during use; the wire core adopts the soft copper structure in accordance with the 6th category structure in GB / T3956, which increases the flexibility of the cable; all components in the cable can meet the requirements of stable and long-term use in special environments, while maintaining the unique performance of the original inverter cable, and the product is suitable for use in oil and gas drilling, construction, power plants and other places.

[0022] 2. The utility model optimizes the position structure of the wire core and the flame retardant filling rope to improve the compactness of the mechanical structure combination layer coating, and at the same time, the wire cores can be fully isolated by the flame retardant filling rope 4, making it difficult for the flame to spread between the multiple wire cores. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0024] Figure 2 It is a left view of the utility model;

[0025] 1-mechanical structure combination layer; 1a-fire-resistant outer jacket layer; 1b-shielding layer; 1c-wrapping layer; 2-accommodating cavity; 3-wire core; 3a-flame-retardant polyvinyl chloride insulation layer; 3b-fire-resistant fluorphlogopite tape; 3c-soft copper conductor; 4-flame-retardant filling rope. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0027] A high density shielded, fire resistant, high flexibility inverter cable, see Figure 1-2 , including a mechanical structure composite layer 1, the mechanical structure composite layer 1 is formed with a multi-level coaxial coating structure, specifically, the mechanical structure composite layer 1 includes a winding layer 1c, a shielding layer 1b and a fire-resistant outer jacket layer 1a which are coaxially arranged in sequence from the inside to the outside, the mechanical structure composite layer 1 forms a hollow, circular accommodating cavity 2 on a cross section orthogonal to its length direction, a plurality of wire cores 3 are coated in the accommodating cavity 2, and a portion of the non-wire core 3 covering area in the accommodating cavity 2 is filled with a plurality of flame retardant filling ropes 4; after the mechanical structure composite layer 1 is destroyed, the flame retardant filling ropes 4 separate the plurality of wire cores 3 to prevent the flame from quickly burning through the plurality of wire cores 3, thereby improving the flame retardant ability.

[0028] The wrapping layer 1c is a ceramic fire-resistant composite tape wrapped around the wire core 3 and the flame-retardant filling rope 4;

[0029] The shielding layer 1b is made of tinned copper wire shielding copper mesh woven from tinned fine round copper wire with a nominal diameter of 0.20mm, and its weaving density is not less than 90%, which can not only prevent corrosion but also effectively prevent the electromagnetic interference to other cables or equipment;

[0030] The fire-resistant outer jacket layer 1a is made of flame-retardant thermoplastic elastomer material, which is extruded outside the shielding layer 1b, which significantly enhances the fire resistance of the cable;

[0031] The flame retardant filling rope 4 is made of flame retardant inorganic paper rope;

[0032] The wire core 3 includes, from the inside to the outside, a soft copper conductor 3c, a fire-resistant fluorphlogopite tape 3b, and a flame-retardant polyvinyl chloride insulation layer 3a, which are coaxially arranged in sequence; wherein, the soft copper conductor 3c is a soft copper structure that complies with the Class 6 structure in GB / T3956, and has strong flexibility. The outside of the soft copper conductor 3c is coated with at least one layer of fire-resistant fluorphlogopite tape 3b to improve the fire resistance, and the flame-retardant polyvinyl chloride insulation layer 3a is extruded on the outside of the outermost fire-resistant fluorphlogopite tape 3b to improve the flame retardant performance.

[0033] In this embodiment, the cores 3 are evenly distributed in the circumferential direction, and the number of the cores 3 is at least 4, the number of the flame retardant filling ropes 4 is not less than the number of the cores 3, and the flame retardant filling ropes 4 are at least filled in the accommodating cavity 2 between adjacent cores 3. The outer circumferential surfaces of adjacent cores 3 are tangent, and all cores 3 are inscribed in the innermost wall surface of the wrapping layer 1c of the mechanical structure combination layer 1. The cores 3 and the mechanical structure combination layer 1 form a close fit, thereby improving the overall deformation resistance and shear resistance of the cable;

[0034] In addition, in the cross-section orthogonal to the length direction of the core 3, the centers of all the cores 3 are located at the vertices of a virtual regular polygon, a flame retardant filling rope 4 is provided at the center of each core 3, and the center of the flame retardant filling rope 4 coincides with the center of the virtual polygon; the flame retardant filling rope 4 located in the center can divide the core 3 in the middle, so that the middle part of the symmetrically distributed cores 3 is supported by the flame retardant filling rope 4, thereby improving stability and at the same time making the cores 3 fully separated to hinder the spread of flame burning.

[0035] In this embodiment, a flame retardant filling rope 4 is arranged between adjacent wire cores 3 and the innermost wall of the mechanical structure combination layer 1, and the outer peripheral surface of the flame retardant filling rope 4 is externally tangent to the two adjacent wire cores 3 and internally tangent to the innermost wall of the mechanical structure combination layer 1; by optimizing the position structure of the wire cores 3 and the flame retardant filling rope 4, the tightness of the mechanical structure combination layer 1 is improved, and at the same time, the wire cores 3 can be fully isolated by the flame retardant filling rope 4, making it difficult for flames to spread between multiple wire cores 3.

[0036] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary personnel in the field to the technical solution of the present invention should fall within the protection scope of the present invention, and the technical contents of the present invention for protection have been fully recorded in the claims.

Claims

1. A high-density shielded, fire-resistant, high-flexibility inverter cable, characterized in that: include: A mechanical structure composite layer formed by a multi-level coaxial coating structure, wherein the mechanical structure composite layer forms a hollow, circular accommodating cavity in a cross section orthogonal to its length direction; A plurality of wire cores are wrapped in a receiving cavity; A plurality of flame retardant filling ropes are filled in the cavity and in the non-core covered area; The mechanical structure composite layer includes, from the inside to the outside, a wrapping layer, a shielding layer and a fire-resistant jacket layer which are coaxially arranged in sequence; wherein, the wrapping layer adopts a ceramic fire-resistant composite tape wrapped around the wire core and the outside of the flame-retardant filling rope, and the shielding layer adopts a tinned copper wire shielding copper mesh woven with tinned fine round copper wire with a nominal diameter of 0.20 mm, and its weaving density is not less than 90%; the fire-resistant jacket layer adopts a flame-retardant thermoplastic elastomer material, which is extruded on the outside of the shielding layer.

2. A high-density shielded, fire-resistant, high-flexibility inverter cable according to claim 1, characterized in that: The cores are evenly distributed in the circumferential direction, and the number of the cores is at least 4. The number of the flame-retardant filling ropes is not less than that of the cores. The flame-retardant filling ropes are at least filled in the accommodating cavity between adjacent cores.

3. A high-density shielded, fire-resistant, high-flexibility inverter cable according to claim 2, characterized in that: The outer peripheral surfaces of the adjacent cores are tangent to each other, and all the cores are inscribed in the innermost wall surface of the mechanical structure assembly layer.

4. A high-density shielded, fire-resistant, high-flexibility inverter cable according to claim 3, characterized in that: In a section orthogonal to the length direction of the core, the centers of all the cores are located at the vertices of a virtual regular polygon, a flame retardant filling rope is arranged at the center of each core, and the center of the flame retardant filling rope coincides with the center of the virtual polygon.

5. A high-density shielded, fire-resistant, high-flexibility inverter cable according to claim 4, characterized in that: A flame retardant filling rope is arranged between adjacent wire cores and the innermost wall of the mechanical structure combination layer, and the outer peripheral surface of the flame retardant filling rope is circumscribed with the two adjacent wire cores and inscribed with the innermost wall of the mechanical structure combination layer.

6. A high-density shielded, fire-resistant, high-flexibility inverter cable according to claim 1, characterized in that: The flame retardant filling rope is made of flame retardant inorganic paper rope.

7. A high-density shielded, fire-resistant, high-flexibility inverter cable according to claim 1, characterized in that: The wire core comprises, from the inside to the outside, a soft copper conductor, a fire-resistant fluorphlogopite tape, and a flame-retardant polyvinyl chloride insulation layer which are coaxially arranged in sequence; wherein the outside of the soft copper conductor is coated with at least one layer of fire-resistant fluorphlogopite tape, and the flame-retardant polyvinyl chloride insulation layer is extruded onto the outside of the outermost fire-resistant fluorphlogopite tape.

8. A high-density shielded, fire-resistant, high-flexibility inverter cable according to claim 7, characterized in that: The soft copper conductor is a soft copper structure that complies with the 6th type structure in GB / T3956.

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