Flame-retardant variable frequency cable

Abstract

The utility model relates to the technical field of cables, and discloses a flame-retardant variable frequency cable, which comprises a wire core layer, a shielding layer and an outer sheath layer, the wire core layer comprises a support frame, a plurality of main wire cores and a plurality of ground wire cores, the plurality of main wire cores and the plurality of ground wire cores are arranged on the support frame, a plurality of flame-retardant cavities are arranged in the wire core layer, and the shielding layer is arranged in the flame-retardant cavities. A flame-retardant cavity is arranged in the shielding layer, a flame-retardant strip is arranged in the flame-retardant cavity, a plurality of flame-retardant bags are arranged on the flame-retardant strip, the flame-retardant bags are filled with inert gas, and a flame-retardant layer is arranged between the shielding layer and the outer sheath layer. According to the utility model, the problems that the flexibility of the cable is affected due to the fact that the flame-retardant layer of the existing cable is thicker, the flame-retardant effect is poorer due to the fact that the flame-retardant layer of the existing cable is thinner, and the risk of burning the cable core still exists can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a flame-retardant variable frequency cable. Background Art

[0002] Frequency conversion cables are mainly used for the connection between frequency conversion power supplies and frequency conversion motors, as well as for the transmission of electric energy in power transmission and distribution lines with a rated voltage of 1KV or less. Frequency conversion cables mainly include three main insulated wires and three neutral insulated wires. Shielding layers and outer sheath layers are sequentially arranged outside the main insulated wires and the neutral insulated wires to form a 3+3 core structure. This structure makes the cable have strong voltage impact resistance, can withstand the pulse voltage during high-speed and frequent frequency conversion, and play a good protective role for frequency conversion electrical appliances.

[0003] The current frequency conversion cables mainly achieve flame retardant effects by adding flame retardant layers. However, if the flame retardant layer is set too thick, it will affect the flexibility of the cable, while if it is set too thin, the flame retardant effect will be poor, and there is still a risk of burning the wire core. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a flame retardant variable frequency cable to solve the problem that a thick flame retardant layer of the current cable will affect the flexibility of the cable, while a thinner flame retardant layer will lead to poor flame retardant effect and there is still a risk of burning the core.

[0005] The utility model solves the above technical problems through the following technical means:

[0006] A flame-retardant variable-frequency cable comprises a wire core layer, a shielding layer and an outer sheath layer, wherein the wire core layer comprises a support frame, a plurality of main wire cores and a plurality of ground wire cores, wherein the plurality of main wire cores and the plurality of ground wire cores are arranged on the support frame, wherein a plurality of flame-retardant cavities are arranged in the wire core layer, wherein a flame-retardant strip is arranged in the flame-retardant cavity, wherein a plurality of flame-retardant bags are arranged on the flame-retardant strip, wherein the flame-retardant bags are filled with inert gas, and a flame-retardant layer is arranged between the shielding layer and the outer sheath layer.

[0007] Furthermore, the support frame is provided with a plurality of first installation grooves and a plurality of second installation grooves, a plurality of the main wire cores are embedded in the first installation grooves, and a plurality of the ground wire cores are embedded in the second installation grooves.

[0008] Furthermore, the two sides of the flame retardant cavity are respectively connected to the main wire core and the ground wire core at the corresponding positions, and the two sides of the flame retardant strip are respectively connected to the main wire core and the ground wire core at the corresponding positions.

[0009] Furthermore, the shielding layer is a metal braided layer with a braiding density of 92-92.5%.

[0010] Furthermore, a flame retardant layer is provided between the shielding layer and the outer sheath layer, the flame retardant layer is a glass fiber fireproof tape, and the thickness of the flame retardant layer is 0.2-0.25 mm.

[0011] Furthermore, a nylon reinforcement rope is arranged at the center of the support frame.

[0012] Furthermore, the main line core is coated with a main line insulation layer, and the ground line core is coated with a ground line insulation layer.

[0013] Furthermore, the main line insulation layer is coated with a main line shielding tape.

[0014] Beneficial effects of the utility model:

[0015] The utility model provides a flame retardant layer and a flame retardant strip to provide a flame retardant layer of appropriate thickness while ensuring the flexibility of the cable. The flame retardant layer provides preliminary fire protection for the cable. When the flame retardant layer fails, the flame retardant strip releases inert gas for flame retardancy. The double protection effectively improves the flame retardant effect of the cable and avoids burning of the wire core. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a flame-retardant frequency conversion cable of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of a support frame and a flame retardant strip in a flame retardant frequency conversion cable of the utility model;

[0018] Among them, 11, support frame; 111, first installation slot; 112, second installation slot; 2, shielding layer; 3, outer sheath layer; 4, main line core; 41, main line insulation layer; 42, main line shielding tape; 5, ground wire core; 51, ground wire insulation layer; 6, nylon reinforcement rope; 7, flame retardant layer; 8, flame retardant strip; 81, flame retardant bag. DETAILED DESCRIPTION

[0019] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are only for exemplary descriptions, and they are only schematic diagrams, not physical diagrams, and cannot be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts in the figures may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the figures may be omitted.

[0020] The same or similar numbers in the figures of the embodiments of the present invention correspond to the same or similar parts. In the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the figures, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the figures are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0021] like Figure 1-Figure 2 As shown, a flame-retardant variable frequency cable of the utility model includes a wire core layer, a shielding layer 2 and an outer sheath layer 3. The wire core layer includes a support frame 11, a plurality of main wire cores 4 and a plurality of ground wire cores 5. In this embodiment, three main wire cores 4 and three ground wire cores 5 are respectively provided. The support frame 11 and the outer sheath layer 3 are both made of rubber. A nylon reinforcing rope 6 is provided at the center of the support frame 11 to increase the tensile strength of the cable. The main wire core 4 is coated with a main wire insulation layer 41, and the ground wire core 5 is coated with a ground wire insulation layer 51. The main wire insulation layer 41 and the ground selection insulation layer are both made of polyolefin insulation material. Three first installation grooves 111 and three second installation grooves 112 are provided on the support frame 11. The first installation groove 111 and the second installation groove 112 are both arranged at equal angles along the axis of the cable, and the first installation groove 111 and the second installation groove 112 are arranged at intervals. A plurality of main wire cores 4 are embedded in the first installation groove 111 , and a plurality of ground wire cores 5 are embedded in the second installation groove 112 .

[0022] In this embodiment, a flame retardant layer 7 is provided between the shielding layer 2 and the outer sheath layer 3. The thickness of the flame retardant layer 7 is 0.2-0.25 mm, and the flame retardant layer 7 is a glass fiber fireproof tape. The flame retardant layer 7 provides preliminary fireproof and flame retardant protection for the cable. A plurality of flame retardant cavities are provided in the wire core layer, and the two sides of the flame retardant cavity are respectively connected to the corresponding main wire core 4 and the ground wire core 5. A flame retardant strip 8 is provided in the flame retardant cavity, and the two sides of the flame retardant strip 8 are respectively connected to the corresponding main wire core 4 and the ground wire core 5. A plurality of flame retardant packages 81 are provided on the flame retardant strip 8, and the flame retardant package 81 is filled with inert gas. When the flame retardant layer 7 fails, the flame retardant package 81 on the flame retardant strip 8 is damaged at high temperature, releasing the internal inert gas for flame retardancy, and providing double protection, which effectively improves the flame retardant effect of the cable and prevents the wire core from burning.

[0023] In this embodiment, the shielding layer 2 is coated on the outside of the wire core layer, and the shielding layer 2 is a metal braided layer, preferably a copper braided layer, with a braiding density of 92-92.5%. The main line insulation layer 41 is coated with a main line shielding tape 42. Double-layer shielding protection improves the stability of cable operation.

[0024] The above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model. The technology, shape, and structure that are not described in detail in the utility model are all well-known technologies.

Claims

1. A flame-retardant variable frequency cable, comprising a core layer, a shielding layer and an outer sheath layer, characterized in that: The wire core layer includes a support frame, multiple main wire cores and multiple ground wire cores, and the multiple main wire cores and multiple ground wire cores are all arranged on the support frame. Multiple flame-retardant cavities are arranged in the wire core layer, and flame-retardant strips are arranged in the flame-retardant cavities. Several flame-retardant bags are arranged on the flame-retardant strips, and the flame-retardant bags are filled with inert gas. A flame-retardant layer is arranged between the shielding layer and the outer sheath layer.

2. The flame-retardant frequency conversion cable according to claim 1, characterized in that: The support frame is provided with a plurality of first installation grooves and a plurality of second installation grooves, a plurality of the main wire cores are embedded in the first installation grooves, and a plurality of the ground wire cores are embedded in the second installation grooves.

3. The flame-retardant frequency conversion cable according to claim 1, characterized in that: The two sides of the flame retardant cavity are respectively connected to the main wire core and the ground wire core at the corresponding positions, and the two sides of the flame retardant strip are respectively connected to the main wire core and the ground wire core.

4. The flame-retardant frequency conversion cable according to claim 1, characterized in that: The shielding layer is a metal braided layer with a braiding density of 92-92.5%.

5. The flame-retardant frequency conversion cable according to claim 1, characterized in that: The flame retardant layer is a glass fiber fireproof tape, and the thickness of the flame retardant layer is 0.2-0.25 mm.

6. The flame-retardant frequency conversion cable according to claim 5, characterized in that: A nylon reinforcement rope is arranged at the center of the support frame.

7. The flame-retardant frequency conversion cable according to claim 6, characterized in that: The main line core is covered with a main line insulation layer, and the ground line core is covered with a ground line insulation layer.

8. The flame-retardant frequency conversion cable according to claim 7, characterized in that: The main line insulation layer is coated with a main line shielding tape.

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