Longitudinal water-blocking flame-retardant low-voltage power cable

Abstract

The utility model discloses a longitudinal water-blocking flame-retardant low-voltage power cable, which comprises a copper corrugated pipe, a waterproof separation layer is arranged in the copper corrugated pipe, the waterproof separation layer divides the interior of the copper corrugated pipe into a plurality of cable core cavities, and a cable core is arranged in each cable core cavity; a fireproof mud layer is arranged outside the copper corrugated pipe, a pp belt is wound outside the fireproof mud layer, and an outer sheath is arranged outside the pp belt. According to the utility model, the insulating fireproof layer and the insulating oxygen-isolating layer are extruded outside the conductor, and the used ceramic polyolefin material can form a hard ceramic substance in case of a fire, so that a good heat insulation effect is achieved, and the normal operation of the conductor is protected. According to the utility model, water-blocking powder, water-blocking paste or water-blocking yarns are added when the conductors are twisted, the conductors are wrapped by the expansion water-blocking tapes, and the waterproof separation layers are arranged among the conductors, so that a three-layer waterproof structure of the cable is formed, and the longitudinal water-blocking capability of the cable is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a longitudinal water-blocking and flame-retardant low-voltage power cable. Background Art

[0002] Power cables are a vital component of power systems, and their performance directly impacts their safety during use. With the continuous development of society, increasingly stringent performance requirements are being placed on power cables, such as fire resistance, as fires can cause significant damage. Furthermore, during cable installation, cables inevitably encounter humid environments or sudden rain, which can cause water ingress, severely impacting their performance and potentially rendering them useless. Therefore, it is necessary to develop a longitudinally water-blocking, flame-retardant, low-voltage power cable. Summary of the Invention

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides a longitudinal water-blocking and flame-retardant low-voltage power cable.

[0004] In order to achieve the above-mentioned purpose of the invention, the technical solution adopted by the utility model is: it includes a copper bellows, a waterproof separation layer is arranged inside the copper bellows, the waterproof separation layer divides the interior of the copper bellows into several cable core cavities, and a cable core is arranged in each cable core cavity; a fireproof mud layer is arranged on the outside of the copper bellows, a PP belt is wrapped around the outside of the fireproof mud layer, and an outer sheath is arranged on the outside of the PP belt.

[0005] Furthermore, the cable core includes a conductor, and an expansion water-blocking tape, an insulating fireproof layer, an insulating oxygen-isolating layer and an aluminum-plastic composite tape arranged in sequence outside the conductor. The expansion water-blocking tape is wrapped around the outside of the conductor, and the aluminum-plastic composite tape is wrapped around the outside of the insulating oxygen-isolating layer.

[0006] Furthermore, the insulating fireproof layer and the insulating oxygen-isolating layer are both made of ceramic polyolefin material.

[0007] Furthermore, the conductors are filled with a water-blocking material when being twisted, and the water-blocking material is water-blocking powder, water-blocking paste or water-blocking yarn.

[0008] Furthermore, an expandable water-blocking filling rope is filled between the cable core cavity and the cable core.

[0009] Furthermore, a glass fiber tape is wrapped around the outside of the plurality of cable cores, and the glass fiber tape is located between the cable core and the copper corrugated tube.

[0010] Furthermore, the waterproof separation layer is in a herringbone shape, and the waterproof separation layer evenly divides the interior of the copper corrugated tube into three cable core cavities.

[0011] Furthermore, the outer sheath is made of polyolefin.

[0012] Furthermore, the waterproof separation layer is made of polyvinyl chloride.

[0013] The beneficial effects of the utility model are:

[0014] The utility model extrude an insulating fireproof layer and an insulating oxygen-isolating layer on the outside of the conductor. The ceramic polyolefin material used will form a hard ceramic in the event of a fire, which has a good heat-insulating effect and protects the normal operation of the conductor. In addition to cabling, the overall fireproof performance of the cable is further improved by wrapping the glass fiber tape and extruding the fireproof mud layer, so that it reaches the B1 level flame retardant effect. The double fireproof design ensures the safety of the cable. In addition, during the laying process of the cable, it is inevitable to encounter a humid environment or sudden rain, which may cause water to enter the cable, seriously affecting the use of the cable, and seriously causing the cable to be damaged and scrapped. Therefore, in the design of the cable, water-blocking powder, water-blocking paste or water-blocking yarn is added when the conductor is twisted to ensure the dryness of the conductor. The expansion water-blocking tape wrapped around the conductor ensures that the outer structure is not affected by water entering the conductor. When cabling, a waterproof separation layer is used to separate each cable core to prevent the water vapor of the core from affecting each other. The interior is filled with water-blocking rope to ensure the dryness of the cable core and absorb excess moisture. The utility model forms a three-layer waterproof structure of the cable by adding water-blocking powder, water-blocking paste or water-blocking yarn when the conductors are twisted, wrapping the conductors with expandable water-blocking tape, and arranging a waterproof separation layer between the conductors, thereby ensuring the longitudinal water-blocking ability of the cable and preventing the cable from being affected by water in a humid environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0016] The symbols of the components are as follows:

[0017] 1. Conductor; 2. Expandable water-blocking tape; 3. Insulating fireproof layer; 4. Insulating oxygen barrier layer; 5. Aluminum-plastic composite tape; 6. Fiberglass tape; 7. Copper bellows; 8. Fireproof mud layer; 9. PP tape; 10. Outer sheath; 11. Waterproof separation layer; 12. Expandable water-blocking filling rope. DETAILED DESCRIPTION

[0018] The specific implementation methods of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific implementation methods. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all utility model creations using the concept of the present invention are protected.

[0019] like Figure 1As shown, the longitudinal water-blocking and flame-retardant low-voltage power cable includes a copper bellows 7, which is internally provided with a waterproof separation layer 11. The waterproof separation layer 11 is in a herringbone shape and evenly divides the interior of the copper bellows 7 into three cable core cavities. Each cable core cavity is provided with a cable core, wherein the waterproof separation layer 11 is preferably made of polyvinyl chloride. A fireproof mud layer 8 is provided on the outside of the copper bellows 7, and a PP tape 9 is wrapped around the outside of the fireproof mud layer 8. An outer sheath 10 is provided on the outside of the PP tape 9. The outer sheath 10 is preferably made of B1 grade flame-retardant polyolefin. An expandable water-blocking filling rope 12 is filled between the cable core cavity and the cable core. The expandable water-blocking filling rope 12 can play a water-blocking role after absorbing water and swelling.

[0020] The cable core includes a conductor 1, and an expansion water-blocking tape 2, an insulating fireproof layer 3, an insulating oxygen-barrier layer 4, and an aluminum-plastic composite tape 5, which are sequentially arranged on the outside of the conductor 1. The expansion water-blocking tape 2 is wrapped around the outside of the conductor 1, and the aluminum-plastic composite tape 5 is wrapped around the outside of the insulating oxygen-barrier layer 4. The insulating fireproof layer 3 and the insulating oxygen-barrier layer 4 are both made of ceramic polyolefin material. The ceramic polyolefin material used will form a hard ceramic in the event of a fire, providing excellent thermal insulation and protecting the normal operation of the conductor.

[0021] The conductors 1 are filled with a water-blocking material when they are twisted. The water-blocking material is water-blocking powder, water-blocking paste, or water-blocking yarn. During cable laying, it is inevitable to encounter humid environments or sudden rain, which may cause water to enter the cable, seriously affecting the cable's serviceability and even causing damage and scrapping. Therefore, in the cable design, water-blocking powder, water-blocking paste, or water-blocking yarn is added when the conductors 1 are twisted to ensure that the conductors 1 are dry.

[0022] Several cable cores are wrapped with glass fiber tapes 6 between the cable cores and the copper corrugated tube 7. By wrapping the glass fiber tapes 6 and extruding the fireproof mud layer 8, the overall fireproof performance of the cable is further improved, achieving a B1 flame retardant effect. The double fireproof design ensures the safety of the cable.

[0023] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A longitudinal water-blocking and flame-retardant low-voltage power cable, characterized in that: It comprises a copper bellows (7), wherein a waterproof separation layer (11) is provided inside the copper bellows (7), and the waterproof separation layer (11) divides the inside of the copper bellows (7) into a plurality of cable core cavities, and a cable core is provided in each of the cable core cavities; The copper bellows (7) is provided with a fireproof mud layer (8) on the outside, a PP tape (9) is wound around the outside of the fireproof mud layer (8), and an outer sheath (10) is provided on the outside of the PP tape (9).

2. The longitudinal water-blocking and flame-retardant low-voltage power cable according to claim 1, characterized in that: The cable core comprises a conductor (1), and an expansion water-blocking tape (2), an insulating fireproof layer (3), an insulating oxygen-isolating layer (4), and an aluminum-plastic composite tape (5) sequentially arranged outside the conductor (1), wherein the expansion water-blocking tape (2) is wound around the outside of the conductor (1), and the aluminum-plastic composite tape (5) is wound around the outside of the insulating oxygen-isolating layer (4).

3. The longitudinal water-blocking and flame-retardant low-voltage power cable according to claim 2, characterized in that: The insulating fireproof layer (3) and the insulating oxygen-isolating layer (4) are both made of ceramic polyolefin material.

4. The longitudinal water-blocking and flame-retardant low-voltage power cable according to claim 2, characterized in that: The conductor (1) is filled with a water-blocking material when twisted, and the water-blocking material is water-blocking powder, water-blocking paste or water-blocking yarn.

5. The longitudinal water-blocking and flame-retardant low-voltage power cable according to claim 1, characterized in that: An expansion water-blocking filling rope (12) is filled between the cable core cavity and the cable core.

6. The longitudinal water-blocking and flame-retardant low-voltage power cable according to claim 1, characterized in that: Glass fiber tapes (6) are wound around the outside of the plurality of cable cores, and the glass fiber tapes (6) are located between the cable cores and the copper corrugated tube (7).

7. The longitudinal water-blocking and flame-retardant low-voltage power cable according to claim 1, characterized in that: The waterproof separation layer (11) is in a herringbone shape, and the waterproof separation layer (11) evenly divides the interior of the copper corrugated tube (7) into three cable core cavities.

8. The longitudinal water-blocking and flame-retardant low-voltage power cable according to claim 1, characterized in that: The outer sheath (10) is made of polyolefin material.

9. The longitudinal water-blocking and flame-retardant low-voltage power cable according to claim 1, characterized in that: The waterproof separation layer (11) is made of polyvinyl chloride.

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