CN209591645U - Fire-resistant anti ultraviolet middling pressure power cable - Google Patents

Abstract

The utility model discloses a fire-resistant and ultraviolet-proof medium-voltage power cable, which comprises several insulated wire cores, and a tape layer, a water-blocking layer, and a water-blocking tape wrapped around the several insulated wire cores from inside to outside in sequence. layer, water-cooling layer, water-cooling tape layer, refractory layer, refractory tape layer and outer sheath; the insulated wire core includes a conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer and a metal shielding layer from the inside to the outside; The water-cooling layer is composed of several hollow metal wires, and the inside of the hollow metal wires is a cold water flow channel; the refractory layer is extruded from ceramic polyolefin materials. The fire-resistant and ultraviolet-proof medium-voltage power cable described in the utility model can effectively increase the carrying capacity of the cable by reducing the internal temperature of the cable, improve the fire resistance coefficient of the cable, and ensure the normal operation of the cable in the event of a fire.

Description

A fire-resistant and UV-resistant medium-voltage power cable

technical field

The utility model relates to the technical field of cables, in particular to a fire-resistant and ultraviolet-proof medium-voltage power cable.

Background technique

At present, with the rapid development of my country's social economy, there are more and more important engineering facilities such as subways, tunnels, power plants, and nuclear power plants, as well as large supermarkets, exhibition centers, and other crowded places. The high-voltage power supply system is used for power supply, which puts forward requirements for the safety performance of 6kV ~ 35kV cables in case of fire, and requires the cables to maintain normal power supply for a period of time in case of fire, so as to facilitate escape and rescue. However, the current fire-resistant cables are mainly common in cables of 1kV and below, and most of them use mica tape wrapped around the outside of the cable. The mica tape has a certain isolation effect during the combustion process, while medium-voltage cables of 6kV and above cannot use this method. Due to the high voltage level, the mica tape cannot meet the withstand voltage requirements. In addition, the carrying capacity of common medium-voltage cables is limited by the heating of the cable itself and the poor heat dissipation of the environment. Fire resistant medium voltage cables.

Utility model content

In view of the above problems, the purpose of this utility model is to provide a fire-resistant and UV-resistant medium-voltage power cable, which can effectively increase the current carrying capacity of the cable by reducing the internal temperature of the cable, improve the fire resistance coefficient of the cable, and ensure the normal operation of the cable in case of fire.

In order to achieve the above purpose, the utility model provides a fire-resistant and ultraviolet-proof medium-voltage power cable, which includes several insulated wire cores and a tape layer wrapped around the several insulated wire cores from the inside to the outside, water blocking layer, water-blocking tape layer, water-cooling layer, water-cooling tape layer, refractory layer, refractory tape layer and outer sheath; the insulated wire core includes conductor, conductor shielding layer, insulating layer, insulating shielding layer from inside to outside Layer and metal shielding layer; the water-cooling layer is composed of several hollow metal wires, and the inside of the hollow metal wires is a cold water flow channel; the refractory layer is extruded from ceramic polyolefin materials.

Further, the conductor is made of oxygen-free copper rods or aluminum rods or aluminum alloy rods, which are twisted and pressed after wire drawing.

Further, the conductor shielding layer, insulating layer, and insulating shielding layer are processed by three-layer co-extrusion.

Further, the metal shielding layer is made of annealed annealed copper tape overlappingly wrapped or annealed annealed copper wire sparsely wound.

Further, the space between the metal shielding layer and the tape layer is filled with non-alkali glass rope.

Further, the tape layer, the water-blocking tape layer, the water-cooling tape layer and the refractory tape layer are all formed by overlapping and wrapping ceramicized silicone rubber tapes.

Further, the water-blocking layer is wrapped with semi-conductive resistance water tape.

Further, the outer sheath is extruded from an ultraviolet-resistant, halogen-free, flame-retardant sheathing material.

Compared with the prior art, a fire-resistant and ultraviolet-proof medium-voltage power cable provided by the utility model has the following technical effects:

The fire-resistant and ultraviolet-proof medium-voltage power cable described in the utility model is provided with a water-blocking layer, a water-blocking tape layer, a water-cooling layer, a water-cooling tape layer, a fire-resistant layer, a fire-resistant tape layer and The outer sheath, the water-cooling layer is composed of several hollow metal wires, and the inside of the hollow metal wires is a cold water flow channel; when the cable is in normal operation, the cooling water in the cold water flow channel can reduce the internal temperature of the cable, thereby effectively improving the temperature of the cable. Carrying capacity; when the cable encounters a fire, the cooling water in the cold water channel can prevent the flame heat from being transmitted to the inside of the cable, thereby improving the fire resistance coefficient of the cable and ensuring the normal operation of the cable in the event of a fire; at the same time, the good tensile strength of the hollow metal wire The strength has good protection for the cable to bear the external force and the stretching of its own weight. In addition, the refractory layer is extruded from ceramic polyolefin materials by design; it not only meets the needs of cable fire resistance, but also considers the requirements of material selection, structural size, electrical performance, etc., and also achieves cost reduction. The purpose of the cable is that the finished cable can run stably for more than 90 minutes under the rated working voltage and in a fire, which effectively guarantees the escape of personnel, fire self-rescue and fire rescue.

Description of drawings

Figure 1 is a schematic structural view of a fire-resistant and UV-resistant medium-voltage power cable in an embodiment of the present invention.

Among them, 1. Conductor, 2. Conductor shielding layer, 3. Insulation layer, 4. Insulation shielding layer, 5. Metal shielding layer, 6. Tape layer, 7. Water blocking layer, 8. Water blocking tape layer, 9 , water cooling layer, 91, hollow metal wire, 92, cold water flow channel, 10, water cooling tape layer, 11, refractory layer, 12, refractory tape layer, 13, outer sheath, 14, alkali-free glass rope.

Detailed ways

In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplified descriptions, rather than indicating or implying 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 construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Figure 1, a fire-resistant and UV-resistant medium-voltage power cable described in the embodiment of the present invention includes several insulated wire cores and a tape layer that wraps around the several insulated wire cores sequentially from the inside to the outside. 6. Water-blocking layer 7, water-blocking tape layer 8, water-cooling layer 9, water-cooling tape layer 10, refractory layer 11, refractory tape layer 12 and outer sheath 13; the insulated wire core includes in sequence from inside to outside Conductor 1, conductor shielding layer 2, insulating layer 3, insulating shielding layer 4 and metal shielding layer 5; the water cooling layer 9 is composed of several hollow metal wires 91, and the inside of the hollow metal wires 91 is a cold water flow channel 92; The refractory layer 11 is extruded from ceramic polyolefin materials;

The fire-resistant and ultraviolet-proof medium-voltage power cable described in the utility model is provided with a water-blocking layer 7, a water-blocking tape layer 8, a water-cooling layer 9, a water-cooling tape layer 10, a fire-resistant layer 11, The fire-resistant tape layer 12 and the outer sheath 13, the water-cooling layer 9 is composed of several hollow metal wires 91, and the inside of the hollow metal wires 91 is a cold water flow channel 92; when the cable is in normal operation, the cold water flow channel 92 The cooling water can reduce the internal temperature of the cable, thereby effectively increasing the current carrying capacity of the cable; when the cable encounters a fire, the cooling water in the cold water channel 92 can prevent the heat of the flame from being transmitted to the inside of the cable, thereby increasing the fire resistance coefficient of the cable and ensuring that the cable is in a fire condition. Normal operation in case of fire; at the same time, the good tensile strength of the hollow metal wire 91 has good protection for the cable to bear the external force and the stretching of its own weight. In addition, the refractory layer 11 is designed to be extruded from ceramic polyolefin materials; it not only meets the needs of cable fire resistance, but also considers the requirements of material selection, structural size, electrical performance, etc., and at the same time reduces the For the purpose of cost, the finished cable can run stably for more than 90 minutes under the rated working voltage and in a fire, which effectively guarantees the escape of personnel, fire self-rescue and fire rescue. In the embodiment of the present utility model, the water-cooling layer 9 is composed of a plurality of hollow metal wires 91 closely connected together, and the material of the hollow metal wires 91 used is stainless steel. The extruded thickness of the refractory layer 11 is 4mm-7mm.

Preferably, the conductor 1 is made of an oxygen-free copper rod or an aluminum rod or an aluminum alloy rod, which is twisted and pressed after wire drawing.

Preferably, the conductor shielding layer 2, insulating layer 3, and insulating shielding layer 4 are processed by three-layer co-extrusion of cross-linked semi-conductive inner shielding material, cross-linked polyethylene insulating material, and semi-conductive outer shielding material , with good electrical properties.

Preferably, the metal shielding layer 5 is formed by overlapping wrapping of high-purity annealed annealed copper strips or sparsely wound high-purity annealed annealed copper wires.

Preferably, the tape layer 6 , the water-blocking tape layer 8 , the water-cooling tape layer 10 and the refractory tape layer 12 are all formed by overlapping and wrapping ceramicized silicone rubber tapes. In the embodiment of the present utility model, the wrapping thickness of the vitrified silicone rubber belt is 2.0mm-3.5mm.

Preferably, the water blocking layer 7 is wrapped with a semi-conductive resistance water tape. The wrapping thickness of the semiconductive resistance hose is 2 mm to 5 mm.

Preferably, the outer sheath 13 is extruded from an ultraviolet-resistant, halogen-free, flame-retardant sheathing material. The thickness of the sheath is 5mm-7mm.

In summary, the fire-resistant and UV-resistant medium-voltage power cable described in the present invention is provided with a water-blocking layer 7, a water-blocking tape layer 8, a water-cooling layer 9, a water-cooling tape layer 10, a fire-resistant Layer 11, refractory tape layer 12 and outer sheath 13, the water-cooling layer 9 is composed of several hollow metal wires 91, and the inside of the hollow metal wires 91 is a cold water flow channel 92; when the cable is in normal operation, the cold water flow channel The cooling water in 92 can reduce the internal temperature of the cable, thereby effectively increasing the cable carrying capacity; when the cable encounters a fire, the cooling water in the cold water channel 92 can prevent the heat of the flame from transferring to the inside of the cable, thereby increasing the fire resistance coefficient of the cable. It ensures the normal operation of the cable in the event of a fire; at the same time, the good tensile strength of the hollow metal wire 91 provides good protection for the cable to withstand external forces and stretching by its own weight. In addition, the refractory layer 11 is designed to be extruded from ceramic polyolefin materials; it not only meets the needs of cable fire resistance, but also considers the requirements of material selection, structural size, electrical performance, etc., and at the same time reduces the For the purpose of cost, the finished cable can run stably for more than 90 minutes under the rated working voltage and in a fire, which effectively guarantees the escape of personnel, fire self-rescue and fire rescue.

The above are only preferred embodiments of the present utility model, and it should be pointed out that for those of ordinary skill in the art, without departing from the technical principles of the present utility model, some improvements and replacements can also be made. These improvements and replacements It should also be regarded as the protection scope of the present utility model.

Claims (8)

1. A fire-resistant and UV-resistant medium-voltage power cable, characterized in that it includes several insulated wire cores and a tape layer, a water-blocking layer, and a water-blocking tape that are wrapped around the exterior of several insulated wire cores in sequence from the inside to the outside. layer, water-cooling layer, water-cooling tape layer, refractory layer, refractory tape layer and outer sheath; the insulated wire core includes a conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer and a metal shielding layer from the inside to the outside; The water-cooling layer is composed of several hollow metal wires, and the inside of the hollow metal wires is a cold water flow channel; the refractory layer is extruded from ceramic polyolefin materials. 2. The fire-resistant and UV-resistant medium-voltage power cable according to claim 1, wherein the conductor is made of an oxygen-free copper rod or an aluminum rod or an aluminum alloy rod, which is drawn, twisted and pressed tightly. 3. The fire-resistant and UV-resistant medium-voltage power cable according to claim 1, wherein the conductor shielding layer, insulating layer, and insulating shielding layer are processed by three-layer co-extrusion. 4. The fire-resistant and UV-resistant medium-voltage power cable according to claim 1, wherein the metal shielding layer is made of annealed annealed copper tape overlappingly wrapped or annealed annealed copper wire sparsely wound. 5. The fire-resistant and UV-resistant medium-voltage power cable according to claim 1, characterized in that the space between the metal shielding layer and the tape layer is filled with alkali-free glass rope. 6. The fire-resistant and UV-resistant medium-voltage power cable according to claim 1, wherein the tape layer, the water-blocking tape layer, the water-cooling tape layer and the fire-resistant tape layer are all overlapped with ceramic silicon rubber tapes Wrapped. 7. The fire-resistant and UV-resistant medium-voltage power cable according to claim 1, wherein the water-blocking layer is wrapped with a semi-conductive resistance water tape. 8. The fire-resistant and ultraviolet-resistant medium-voltage power cable according to claim 1, wherein the outer sheath is extruded from an ultraviolet-resistant, halogen-free, flame-retardant sheathing material.