Medium-voltage fire-resistant cable

Abstract

The utility model provides a medium-voltage fire-resistant cable, which relates to the technical field of cables and comprises a cable main body, three conductors are arranged in the cable main body, a shielding layer is arranged on the outer side of the three conductors, a flame-retardant layer is arranged on the outer side of the shielding layer, a heat-insulating layer is fixed on the outer wall of the flame-retardant layer, and an oxygen-isolating layer is fixed on the outer wall of the heat-insulating layer. Through the arrangement of the flame-retardant layer, the flame-retardant layer is made of LSZH, and the LSZH is a low-smoke halogen-free flame-retardant material, has low-smoke deformation performance and does not release toxic gas. According to the LSZH cable, smoke and harmful gas can be reduced when a fire occurs, the heat insulation layer is arranged, the heat insulation layer is made of crosslinked polyethylene, the crosslinked polyethylene has good heat resistance and electrical performance and also has good flame retardant performance, oxygen can be isolated through the oxygen isolation layer, and the flame retardant performance of the cable is improved. Therefore, a relatively large fire behavior is prevented from being generated in the first time when the cable main body is short-circuited, and buffer time for people to scatter is reserved.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a medium-voltage fire-resistant cable. Background Art

[0002] Fire-resistant cables are cables that can maintain safe operation for a certain period of time under flame conditions. Fire-resistant cables are widely used in high-rise buildings, subways, underground streets, large power stations, and important industrial and mining enterprises, and other places related to fire safety and firefighting and life-saving. Once a fire occurs, fire-resistant cables can still maintain the normal operation of the control, monitoring, guidance, and alarm system power supply circuits for a period of time under burning conditions, providing valuable time for fire rescue and personnel evacuation.

[0003] A medium-voltage fire-resistant cable in the prior art has poor fire resistance and generates a large amount of smoke when burning, which affects the evacuation of people or the inspection of firefighters and has poor practicality. Utility Model Content

[0004] The utility model aims to solve the problem in the prior art that the fire resistance is poor and a large amount of smoke will be generated during combustion, thus affecting the evacuation of people or the inspection of firefighters, and proposes a medium-voltage fire-resistant cable.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a medium-voltage fire-resistant cable, comprising a cable body, wherein three conductors are arranged in the cable body, a shielding layer is arranged on the outside of the three conductors, a flame-retardant layer is arranged on the outside of the shielding layer, a heat-insulating layer is fixed on the outer wall of the flame-retardant layer, an oxygen-isolating layer is fixed on the outer wall of the heat-insulating layer, and a wear-resistant layer is fixed on the outer wall of the oxygen-isolating layer.

[0006] Preferably, a filling layer is provided outside the three conductors and inside the shielding layer.

[0007] Preferably, an insulating layer is fixed on the outer wall of the shielding layer, and the flame retardant layer is fixed on the outer wall of the insulating layer.

[0008] Preferably, the thickness of the insulating layer and the shielding layer is 0.4 mm to 0.8 mm.

[0009] Preferably, the thickness of the flame retardant layer is 1 mm to 3 mm.

[0010] Preferably, the thickness of the heat insulation layer is 2 mm to 4 mm, and the thickness of the oxygen insulation layer is 0.1 mm to 0.3 mm.

[0011] Preferably, the wear-resistant layer has a thickness of 4 mm to 8 mm.

[0012] Compared with the prior art, the advantages and positive effects of the utility model are:

[0013] In the utility model, the flame retardant layer is provided, and the flame retardant layer adopts LSZH, which is a low-smoke halogen-free flame retardant material, which has low smoke deformation performance and does not release toxic gases. LSZH cable can reduce the generation of smoke and harmful gases when a fire occurs. The heat insulation layer is provided, and the heat insulation layer adopts cross-linked polyethylene, which has good heat resistance and electrical properties, and also has good flame retardant properties. The oxygen isolation layer is provided to isolate oxygen, avoid the generation of a large fire in the first time when the cable body is short-circuited, and leave buffer time for the crowd to disperse, which is more practical. The wear-resistant layer is provided, and the wear-resistant layer adopts polyvinyl chloride, which has the properties of wear resistance, oil resistance and chemical resistance. This device adopts flame retardant materials at all levels, which makes the flame retardant and fire resistance of the device higher on the one hand, and on the other hand, when the cable body is short-circuited and burned, it avoids the generation of large smoke, which is convenient to improve the observation of the fire scene, and is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A three-dimensional diagram of a medium voltage fire-resistant cable is proposed for the utility model;

[0015] Figure 2 A three-dimensional diagram of a medium voltage fire-resistant cable is proposed for the utility model;

[0016] Figure 3 A cross-sectional layered schematic diagram of a medium-voltage fire-resistant cable is proposed for the utility model.

[0017] Legend: 1. Cable body; 2. Conductor; 3. Filling layer; 4. Shielding layer; 5. Insulation layer; 6. Flame retardant layer; 7. Heat insulation layer; 8. Oxygen isolation layer; 9. Wear-resistant layer. DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0020] Embodiment 1, as Figure 1-3As shown, the utility model provides a medium-voltage fire-resistant cable, including a cable body 1, three conductors 2 are arranged in the cable body 1, a shielding layer 4 is arranged on the outside of the three conductors 2, a flame-retardant layer 6 is arranged on the outside of the shielding layer 4, a heat insulation layer 7 is fixed on the outer wall of the flame-retardant layer 6, an oxygen isolation layer 8 is fixed on the outer wall of the heat insulation layer 7, and a wear-resistant layer 9 is fixed on the outer wall of the oxygen isolation layer 8.

[0021] The effect achieved by the entire embodiment 1 is that, through the setting of the insulating layer 5, the current can be insulated and prevented from leaking, so that the cable body 1 is safer. Through the setting of the insulating layer 5, and the insulating layer 5 adopts cross-linked polypropylene, which is an insulating material with good heat resistance and electrical insulation performance, the heat resistance of the cable body 1 is further improved, and the practicality is stronger. Through the setting of the flame retardant layer 6, and the flame retardant layer 6 adopts LSZH, LSZH is a low-smoke halogen-free flame retardant material, it has low smoke deformation performance and will not release toxic gases. LSZH cable can reduce the generation of smoke and harmful gases when a fire occurs. Through the setting of the heat insulation layer 7, the heat insulation layer 7 adopts cross-linked polyethylene, which has good heat resistance and electrical properties, and also has good flame retardant properties. Through the setting of the oxygen isolation layer 8, oxygen can be isolated to avoid a large fire in the first time when the cable body 1 is short-circuited, leaving buffer time for the crowd to disperse, and it is more practical. Through the setting of the wear-resistant layer 9, the wear-resistant layer 9 adopts polyvinyl chloride, which has the properties of wear resistance, oil resistance and chemical resistance. This device adopts flame-retardant materials at all levels. On the one hand, the flame retardant and fire resistant properties of the device are higher. On the other hand, when the cable body is short-circuited and burned, it can avoid the generation of large smoke, which is convenient for improving the observation of the fire scene and is more practical.

[0022] Embodiment 2, as Figure 1-3 As shown, a filling layer 3 is provided outside the three conductors 2 and inside the shielding layer 4, an insulating layer 5 is fixed on the outer wall of the shielding layer 4, a flame retardant layer 6 is fixed on the outer wall of the insulating layer 5, the thickness of the insulating layer 5 and the shielding layer 4 is 0.4mm to 0.8mm, the thickness of the flame retardant layer 6 is 1mm to 3mm, the thickness of the heat insulation layer 7 is 2mm to 4mm, the thickness of the oxygen isolation layer 8 is 0.1mm to 0.3mm, and the thickness of the wear-resistant layer 9 is 4mm to 8mm.

[0023] The effect achieved by the entire embodiment 2 is that, through the setting of the flame retardant layer 6, the flame retardant layer 6 adopts LSZH, and LSZH is a low-smoke halogen-free flame retardant material, which has low smoke deformation performance and does not release toxic gases. LSZH cable can reduce the generation of smoke and harmful gases when a fire occurs, through the setting of the heat insulation layer 7, and the heat insulation layer 7 adopts cross-linked polyethylene, which has good heat resistance and electrical properties, and also has good flame retardant properties, through the setting of the oxygen isolation layer 8, it can isolate oxygen, avoid the cable body 1 when the internal short circuit is generated in the first time, leaving a buffer time for the crowd to disperse, and more practical, through the setting of the wear-resistant layer 9, and the wear-resistant layer 9 adopts polyvinyl chloride, and polyvinyl chloride has the properties of wear resistance, oil resistance and chemical resistance, this device adopts flame retardant materials at all levels, on the one hand, the flame retardant and fire resistance of the device is higher, on the other hand, the cable body 1 is short-circuited and burned, avoids the generation of large smoke, and is convenient to improve the observation of the fire scene, and is more practical.

[0024] Working principle: When the device is used, the insulating layer 5 is set to insulate the current and prevent the current from leaking, so that the cable body 1 is safer. The insulating layer 5 is set, and the insulating layer 5 adopts cross-linked polypropylene, which is an insulating material with good heat resistance and electrical insulation performance, and the heat resistance of the cable body 1 is further improved. The flame retardant layer 6 is set, and the flame retardant layer 6 adopts LSZH, which is a low-smoke halogen-free flame retardant material, which has low smoke deformation performance and will not release toxic gases. LSZH cable can reduce the generation of smoke and harmful gases when a fire occurs. Through the setting of the heat insulation layer 7, the heat insulation layer 7 adopts cross-linked polyethylene, which has good heat resistance and electrical properties, and also has good flame retardant properties. Through the setting of the oxygen isolation layer 8, oxygen can be isolated to avoid a large fire in the first time when the cable body 1 is short-circuited, leaving buffer time for the crowd to disperse, and it is more practical. Through the setting of the wear-resistant layer 9, the wear-resistant layer 9 adopts polyvinyl chloride, which has the properties of wear resistance, oil resistance and chemical resistance. This device adopts flame-retardant materials at all levels. On the one hand, the flame retardant and fire resistant properties of the device are higher. On the other hand, when the cable body is short-circuited and burned, it can avoid the generation of large smoke, which is convenient for improving the observation of the fire scene.

[0025] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A medium voltage fire-resistant cable, comprising a cable body (1), characterized in that: Three conductors (2) are arranged in the cable body (1), shielding layers (4) are arranged on the outside of the three conductors (2), a flame retardant layer (6) is arranged on the outside of the shielding layer (4), a heat insulation layer (7) is fixed on the outer wall of the flame retardant layer (6), an oxygen isolation layer (8) is fixed on the outer wall of the heat insulation layer (7), and a wear-resistant layer (9) is fixed on the outer wall of the oxygen isolation layer (8).

2. A medium voltage fire-resistant cable according to claim 1, characterized in that: A filling layer (3) is provided outside the three conductors (2) and inside the shielding layer (4).

3. A medium voltage fire-resistant cable according to claim 1, characterized in that: An insulating layer (5) is fixed on the outer wall of the shielding layer (4), and the flame retardant layer (6) is fixed on the outer wall of the insulating layer (5).

4. A medium voltage fire-resistant cable according to claim 3, characterized in that: The thickness of the insulating layer (5) and the shielding layer (4) is 0.4 mm to 0.8 mm.

5. A medium voltage fire-resistant cable according to claim 1, characterized in that: The thickness of the flame retardant layer (6) is 1 mm to 3 mm.

6. A medium voltage fire-resistant cable according to claim 1, characterized in that: The thickness of the heat insulation layer (7) is 2 mm to 4 mm, and the thickness of the oxygen insulation layer (8) is 0.1 mm to 0.3 mm.

7. A medium voltage fire-resistant cable according to claim 1, characterized in that: The thickness of the wear-resistant layer (9) is 4 mm to 8 mm.

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