Medium-voltage longitudinal water-blocking high-flame-retardant power cable

Abstract

The utility model provides a medium-voltage longitudinal water-blocking high-flame-retardant power cable, which relates to the technical field of power cables and comprises a conductor, a filling layer is arranged on the outer surface of the conductor, a connecting sleeve is arranged on the outer surface of the filling layer, circular rings are symmetrically arranged on the outer surface of the connecting sleeve, and water-blocking yarns are arranged between the end faces of the two circular rings. According to the utility model, the filling layer and the waterproof layer are cooperatively used, so that the power cable has high longitudinal water-blocking performance, a cavity can be formed between the insulating layer and the waterproof layer under the cooperation of the circular rings and is used for placing a water-blocking tape, and the cavities of the cable are communicated under the cooperation of the through holes. Even if the water-blocking tape of one cavity is damaged or lost, the water-blocking tapes of other cavities can provide additional protection, so that the longitudinal water-blocking performance of the cable is further enhanced, the service life of the cable is prolonged, and the safety of the cable is improved.

Description

Technical Field

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

[0002] Medium voltage power cable is a cable used to transmit medium voltage electric energy. It is usually used to transmit electric energy from substations to distribution stations, industrial facilities, buildings, etc. The rated voltage of medium voltage power cable is generally between 1kV and 35kV.

[0003] In the prior art, medium-voltage power cables are affected by various environmental conditions during use, such as humid environments, underground laying, etc. When the cables are used in a humid environment for a long time, water molecules will slowly enter the interior of the cables, causing corrosion of the metal conductors in the cables, deterioration or damage of the insulation layer, thereby affecting the normal operation of the cables. Utility Model Content

[0004] The purpose of the utility model is to solve the problem in the prior art that medium-voltage power cables are affected by various environmental conditions during use, such as humid environment, underground laying, etc. When the cables are used in a humid environment for a long time, water molecules will slowly enter the interior of the cables, causing corrosion of the metal conductors in the cables, deterioration or damage of the insulation layer, thereby affecting the normal operation of the cables. A medium-voltage longitudinal water-blocking and highly flame-retardant power cable is proposed.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a medium-voltage longitudinal water-blocking and highly flame-retardant power cable, comprising: a conductor, a filling layer is arranged on the surface of the conductor, a connecting sleeve is arranged on the outer surface of the filling layer, circular rings are symmetrically arranged on the outer surface of the connecting sleeve, a water-blocking yarn is arranged between the end faces of the two circular rings, through holes are symmetrically opened at one end of the two circular rings, and a protective sleeve is arranged on the outer surface of the two circular rings; the protective sleeve comprises a waterproof layer, a flame-retardant layer is arranged on the outer surface of the waterproof layer, and a wear-resistant layer is arranged on the outer surface of the flame-retardant layer.

[0006] Preferably, the inner surface of the waterproof layer is fixedly connected to the outer surfaces of the two rings.

[0007] Preferably, the connecting sleeve comprises a shielding layer, and an insulating layer is provided on the outer surface of the shielding layer.

[0008] Preferably, the outer surface of the insulating layer is fixedly connected to the inner surfaces of the two circular rings, and the inner surface of the shielding layer is fixedly connected to the outer surface of the filling layer.

[0009] Preferably, the inner surface of the water-blocking yarn is arranged in contact with the outer surface of the insulating layer.

[0010] Compared with the prior art, the advantages and positive effects of the utility model are:

[0011] 1. In the utility model, the filling layer and the waterproof layer are used together to make the power cable have higher longitudinal water-blocking performance, and with the cooperation of the ring, a cavity can be formed between the insulating layer and the waterproof layer for placing the water-blocking tape, and with the cooperation of the through hole, the cavities of the cable are connected, and even if the water-blocking tape in one cavity is damaged or lost, the water-blocking tapes in other cavities can provide additional protection, further enhancing the longitudinal water-blocking performance of the cable and improving the service life and safety of the cable.

[0012] 2. In the utility model, the shielding layer can provide a good electromagnetic shielding effect, the insulating layer can provide high temperature resistance and electrical insulation performance, and is suitable for cables in high temperature environments. The flame retardant layer has excellent flame retardant properties and chemical resistance, effectively improving the flame retardant properties of the cable and having a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A three-dimensional diagram of a medium-voltage longitudinal water-blocking and highly flame-retardant power cable is proposed for the utility model;

[0014] Figure 2 A partial structural development diagram of a medium-voltage longitudinal water-blocking and highly flame-retardant power cable is proposed for the utility model;

[0015] Figure 3 A schematic diagram of the structure of a connecting sleeve of a medium-voltage longitudinal water-blocking and highly flame-retardant power cable is provided for the utility model;

[0016] Figure 4 The utility model provides a schematic structural diagram of a protective sheath of a medium-voltage longitudinal water-blocking and highly flame-retardant power cable.

[0017] Legend: 1. Conductor; 2. Filling layer; 3. Through hole; 4. Ring; 5. Protective sleeve; 6. Water-blocking yarn; 7. Connecting sleeve; 501. Wear-resistant layer; 502. Flame-retardant layer; 503. Waterproof layer; 701. Shielding layer; 702. Insulating 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-Figure 4 As shown, the utility model provides a medium-voltage longitudinal water-blocking and highly flame-retardant power cable, comprising: a conductor 1, a filling layer 2 is arranged on the outer surface of the conductor 1, a connecting sleeve 7 is arranged on the outer surface of the filling layer 2, a circular ring 4 is symmetrically arranged on the outer surface of the connecting sleeve 7, a water-blocking yarn 6 is arranged between the end faces of the two circular rings 4, through holes 3 are symmetrically opened at one end of the two circular rings 4, and a protective sleeve 5 is arranged on the outer surface of the two circular rings 4; the protective sleeve 5 comprises a waterproof layer 503, a flame-retardant layer 502 is arranged on the outer surface of the waterproof layer 503, a wear-resistant layer 501 is arranged on the outer surface of the flame-retardant layer 502, and the inner surface of the waterproof layer 503 is fixedly connected to the outer surfaces of the two circular rings 4.

[0021] The effect achieved by the entire embodiment 1 is that the conductor 1 is a highly conductive material for transmitting electrical energy, wherein the filling layer 2 is filled with a water-blocking glue, which can effectively prevent moisture from entering the interior of the cable, protect the conductor in the cable from moisture damage, and can also provide a certain supporting force to avoid loose structure. The shielding layer 701 adopts a flexible metal mesh, which has good flexibility and plasticity, can adapt to various bending and deformation, and provide a good electromagnetic shielding effect. The insulating layer 702 adopts silicone rubber, which has excellent high temperature resistance and electrical insulation performance, and is suitable for cables in high temperature environments. The waterproof layer 503 adopts cross-linked polyethylene, a material with high physical properties and chemical resistance, and has excellent insulation and water resistance. The flame retardant layer 502 adopts silicone rubber, which is a fire-resistant and high-temperature resistant material, has excellent flame retardant and chemical resistance, and effectively improves the fire resistance of the cable. The cable has good performance and a long service life. The wear-resistant layer 501 adopts polyurethane elastomer, which has good elasticity and wear resistance, provides good wear resistance, and reduces the possibility of external physical damage to the cable. At the same time, two rings 4 are adhered to the outside of the insulating layer 702, and then the water-blocking tape 6 is wrapped between the two rings 4 along the insulating layer 702. After the winding is completed, the inner wall of the waterproof layer 503 is adhered to the ring 4 to improve the longitudinal water-blocking property of the cable. At the same time, with the cooperation of the through hole 3, the cavity generated by the ring 4, the insulating layer 702 and the waterproof layer 503 can be connected, so that even if the water-blocking tape 6 of one cavity is damaged or lost, the water-blocking tape 6 of other cavities can also provide additional protection, further enhancing the longitudinal water-blocking property of the cable and improving the service life and safety of the cable. The number of rings 4 can be set according to the length of the cable.

[0022] Embodiment 2, as Figure 1-Figure 4As shown, the connecting sleeve 7 includes a shielding layer 701, the outer surface of the shielding layer 701 is provided with an insulating layer 702, the outer surface of the insulating layer 702 is fixedly connected to the inner surfaces of the two rings 4, the inner surface of the shielding layer 701 is fixedly connected to the outer surface of the filling layer 2, and the inner surface of the water-blocking yarn 6 is fitted to the outer surface of the insulating layer 702.

[0023] The effect achieved by the entire embodiment 2 is that, through the arrangement of the shielding layer 701 and the insulating layer 702, a good electromagnetic shielding effect is provided, and the safe and stable operation of the cable in a high temperature environment is ensured.

[0024] Working principle: Conductor 1 is a highly conductive material used to transmit electrical energy, wherein the filling layer 2 can effectively prevent moisture from entering the cable, protecting the conductor in the cable from moisture damage, and can also provide a certain support force to avoid loose structure. The shielding layer 701 has good flexibility and plasticity, can adapt to various bends and deformations, and provide good electromagnetic shielding effect. The insulating layer 702 has excellent high temperature resistance and electrical insulation performance, and is suitable for cables in high temperature environments. The waterproof layer 503 is made of a material with high physical properties and chemical resistance, and has excellent insulation and water resistance. The flame retardant layer 502 has excellent flame retardant and chemical resistance, effectively improving the fire resistance of the cable, and has a long service life. The wear-resistant layer 501 has good elasticity and wear resistance, provides good anti-wear effect, and reduces the possibility of external physical damage to the cable. At the same time, two circular rings 4 are adhered to the outside of the insulating layer 702, and then the water-blocking tape 6 is wrapped between the two circular rings 4 along the insulating layer 702. After the winding is completed, the inner wall of the waterproof layer 503 is adhered to the circular ring 4 to improve the longitudinal water-blocking property of the cable. At the same time, with the cooperation of the through hole 3, the cavity generated by the circular ring 4, the insulating layer 702 and the waterproof layer 503 can be connected, so that even if the water-blocking tape 6 of one cavity is damaged or lost, the water-blocking tape 6 of other cavities can also provide additional protection, further enhancing the longitudinal water-blocking property of the cable and improving the service life and safety of the cable.

[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 longitudinal water-blocking and highly flame-retardant power cable, characterized in that: include: A conductor (1), wherein a filling layer (2) is arranged on the outer surface of the conductor (1), a connecting sleeve (7) is arranged on the outer surface of the filling layer (2), a circular ring (4) is symmetrically arranged on the outer surface of the connecting sleeve (7), a water-blocking yarn (6) is arranged between the end surfaces of the two circular rings (4), through holes (3) are symmetrically opened at one end of the two circular rings (4), and a protective sleeve (5) is arranged on the outer surface of the two circular rings (4); The protective cover (5) comprises a waterproof layer (503), the outer surface of the waterproof layer (503) is provided with a flame retardant layer (502), and the outer surface of the flame retardant layer (502) is provided with a wear-resistant layer (501).

2. The medium voltage longitudinal water-blocking and highly flame-retardant power cable according to claim 1, characterized in that: The inner surface of the waterproof layer (503) is fixedly connected to the outer surfaces of the two circular rings (4).

3. The medium voltage longitudinal water-blocking and highly flame-retardant power cable according to claim 2 is characterized in that: The connecting sleeve (7) comprises a shielding layer (701), and an insulating layer (702) is provided on the outer surface of the shielding layer (701).

4. The medium voltage longitudinal water-blocking and highly flame-retardant power cable according to claim 3 is characterized in that: The outer surface of the insulating layer (702) is fixedly connected to the inner surfaces of the two circular rings (4), and the inner surface of the shielding layer (701) is fixedly connected to the outer surface of the filling layer (2).

5. The medium voltage longitudinal water-blocking and highly flame-retardant power cable according to claim 4, characterized in that: The inner surface of the water-blocking yarn (6) is arranged in close contact with the outer surface of the insulating layer (702).

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