Fire-resistant and pressure-resistant power transmission cable

Abstract

The utility model discloses a fire-resistant and pressure-resistant power transmission cable, which comprises a plurality of cable cores, inner fire-resistant insulating layers are independently coated outside the cable cores, the cable cores are arranged in a middle isolating layer in a penetrating manner, and elastic fire-resistant fillers are filled between the inner fire-resistant insulating layers and the middle isolating layer; a supporting fireproof layer is arranged outside the middle isolating layer and is formed by winding a steel strand belt and an elastic fireproof belt in parallel, and an outer fireproof insulating layer is arranged on the outer side of the supporting fireproof layer. According to the utility model, the elastic fireproof filler is filled between the inner fireproof insulating layer and the middle isolating layer, and the supporting fireproof layer is formed by winding the steel stranded belts and the elastic fireproof belts in parallel, so that internal fire can be prevented from spreading outwards or external fire can be prevented from spreading inwards, and meanwhile, the cable has relatively good bending performance, and the compression resistance is ensured; and the elastic fireproof belt can dynamically seal the gap of the steel stranded belt when the cable is bent, so that the supporting capability is ensured, and an external fire can be prevented from directly spreading inwards from the gap of the steel stranded belt.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, and particularly relates to a fire-resistant and compression-resistant power transmission cable. Background Art

[0002] Power transmission cables are mainly used for transmitting electric energy. Their characteristics are large current and voltage. In case of faults such as short circuits, fires are likely to occur. Therefore, power transmission cables need good fire prevention capabilities. However, at present, the fire prevention of many cables mainly focuses on preventing external fires, and there is a lack of fire prevention mechanisms between the internal cable cores. Secondly, power cables sometimes need to be buried underground. If the compression resistance is insufficient, it is easy to cause deformation of the internal cable cores, change the balance of resistance, and easily cause local high temperature and fire. Currently, the main method is to cover a steel strip armor layer to increase the compression resistance, but this also leads to a decrease in the bending ability of the cable, increasing the difficulty of wiring construction. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a fire-resistant and compression-resistant power transmission cable to solve the technical problems in the above background art.

[0004] The technical solution of the utility model is as follows:

[0005] A fire-resistant and compression-resistant power transmission cable includes several cable cores individually coated with an inner fire-resistant insulating layer on the outside. The cable cores are all installed in the middle isolation layer, and an elastic fire-proof filler is filled between the inner fire-resistant insulating layer and the middle isolation layer; outside the middle isolation layer is a support fire-proof layer, which is formed by coiling a steel stranded tape and an elastic fire-proof tape side by side. The outer fire-resistant insulating layer is located outside the support fire-proof layer.

[0006] Further, the inner fire-resistant insulating layer is made of low-smoke and halogen-free flame-retardant polyethylene material.

[0007] Further, the elastic fire-proof filler is made of polyurethane or silicone.

[0008] Further, the middle isolation layer is made of perfluoroethylenepropylene.

[0009] Further, the outer fire-resistant insulating layer is made of silicone rubber.

[0010] Further, the elastic fire-proof tape is made of chlorosulfonated polyethylene.

[0011] The beneficial effects of the utility model are as follows:

[0012] In the present utility model, an elastic fireproof filler is filled between the inner refractory insulation layer and the intermediate isolation layer, and the support fireproof layer is formed by juxtaposed winding of steel stranded tapes and elastic fireproof tapes. In this way, not only can internal fires be prevented from spreading outwards or external fires from spreading inwards, but at the same time, the cable can have good bending performance while ensuring compressive performance. The elastic fireproof tape can dynamically seal the gaps of the steel stranded tapes when the cable is bent, ensuring the support capacity, so as to prevent external fires from directly spreading inwards through the gaps of the steel stranded tapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of the present utility model.

[0014] In the figure: 1 - cable core, 2 - inner refractory insulation layer, 3 - elastic fireproof filler, 4 - intermediate isolation layer, 5 - steel stranded tape, 6 - elastic fireproof tape, 7 - outer refractory insulation layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following further describes the specific embodiments of the present utility model with reference to the accompanying drawings. It should be noted here that the description of these embodiments is used to help understand the present utility model, but does not constitute a limitation to the present utility model. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0016] As Figure 1 shown:

[0017] A fireproof and compressive power transmission cable, which includes a plurality of cable cores 1 separately coated with an inner refractory insulation layer 2 on the outside. The inner refractory insulation layer 2 can be made of low-smoke and halogen-free flame-retardant polyethylene, which on the one hand plays an insulating role between the cable cores 1, and secondly avoids the spread of fire from the inside to the outside when a short circuit occurs in a certain cable core 1.

[0018] All the cable cores 1 are installed in the intermediate isolation layer 4, and an elastic fireproof filler 3 is filled between the inner refractory insulation layer 2 and the intermediate isolation layer 4, such as polyurethane or silicone. When the elastic fireproof filler 3 encounters the expansion force generated by fire, these materials with larger expansion volume can play a role in filling, sealing and supporting, and can play a good heat insulation role in case of fire, controlling the spread of fire. At the same time, the elastic fireproof filler 3 itself is also a flame-retardant material, which can ensure the safety of the cable in case of fire, and at the same time seal the gaps between the cable cores 1, improving the compressive capacity.

[0019] The middle isolation layer 4 still needs to have good fireproof performance, and polytetrafluoroethylene can be used. Outside the middle isolation layer 4 is the support fireproof layer, which is formed by juxtaposed winding of steel stranded tapes 5 and elastic fireproof tapes 6. Compared with the traditional armored layer, the utility model is formed by juxtaposed winding of steel stranded tapes 5 and elastic fireproof tapes 6. In this way, the cable can have good bending performance while ensuring compressive performance. The elastic fireproof tape 6 can dynamically seal the gaps of the steel stranded tapes 5 when the cable is bent, ensuring the support ability. The elastic fireproof tape 6 can be made of chlorosulfonated polyethylene, which not only has good elasticity but also very strong fire resistance, so as to avoid the direct spread of external fire from the gaps of the steel stranded tapes 5 inward.

[0020] Outside the support fireproof layer is the outer fireproof insulation layer 7, and the outer fireproof insulation layer 7 can be made of silicone rubber. The support fireproof layer is the outermost protection of the cable, which can prevent the cable from being damaged by external force and machinery. Silicone rubber belongs to a high-elasticity material, which can improve the heat resistance, tensile strength and compressive strength of the cable, and has very good fireproof ability itself.

[0021] The above has described the embodiments of the present utility model in detail with reference to the accompanying drawings, but the present utility model is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present utility model, various changes, modifications, replacements and variations made to these embodiments still fall within the protection scope of the present utility model.

Claims

1. A fire-resistant and compression-resistant power transmission cable, characterized in that: It includes several cable cores individually wrapped with an inner fire-resistant insulating layer on the outside. The cable cores are all installed in the intermediate isolation layer, and an elastic fireproof filler is filled between the inner fire-resistant insulating layer and the intermediate isolation layer. Outside the intermediate isolation layer is a support fireproof layer, which is formed by juxtaposed winding of steel stranded tapes and elastic fireproof tapes. An outer fire-resistant insulating layer is located outside the support fireproof layer.

2. The fire-resistant and compressive power transmission cable according to claim 1, wherein: The inner fire-resistant insulating layer is made of low-smoke and halogen-free flame-retardant polyethylene material.

3. The fire-resistant and compressive power transmission cable according to claim 1, wherein: The elastic fireproof filler uses polyurethane or silicone.

4. The fire-resistant and compression-resistant power transmission cable according to claim 1, wherein: The intermediate isolation layer uses perfluoroethylenepropylene.

5. The fire-resistant and compressive power transmission cable according to claim 1, wherein: The outer fire-resistant insulating layer uses silicone rubber.

6. The fire-resistant and compression-resistant power transmission cable according to any one of claims 1-5, characterized in that: The elastic fireproof tape uses chlorosulfonated polyethylene.

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