Crosslinked polyethylene insulation polyethylene sheath power cable

Abstract

The utility model relates to a crosslinked polyethylene insulation polyethylene sheath power cable, which belongs to the technical field of power cables, and comprises a cable conductor body, a conductor protection layer is arranged outside the cable conductor body, an inner protection layer is arranged outside the conductor protection layer, and an outer protection layer is arranged outside the inner protection layer. And a tensile structure layer capable of improving the overall tensile strength of the cable is arranged in the inner protection layer. According to the cross-linked polyethylene insulated polyethylene sheath power cable, the plurality of cable conductor bodies can be wrapped and fixed by arranging the wrapping layer, the loosening condition of the cable conductor bodies is avoided, the power cable can bear large tensile force by arranging the armored wrapping layer, meanwhile, the good compression resistance is achieved, and the metal sheath is arranged, so that the cable conductor bodies are prevented from being loosened, and the service life of the cable conductor bodies is prolonged. Interference of an external electric field and a magnetic field can be effectively shielded, external electromagnetic interference is prevented from influencing electric signals transmitted in the cable, stable transmission of electric power or signals is guaranteed, and meanwhile the tensile property is further improved.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, specifically to a cross-linked polyethylene insulated and polyethylene sheathed power cable. Background Technology

[0002] Power cables are cables used for transmitting and distributing electrical energy. They are commonly used in urban underground power grids, power plant lead-out lines, internal power supply in industrial and mining enterprises, and underwater transmission lines across rivers and seas. The proportion of cables in power lines is gradually increasing. Power cables are cable products used in the main lines of power systems to transmit and distribute high-power electrical energy, including power cables of various voltage levels from 1-500kV and above, and various types of insulation.

[0003] Chinese utility model patent CN213150450U discloses a cross-linked polyethylene insulated and polyethylene sheathed power cable, comprising a conductor, a first drying cotton layer, and a shock-absorbing layer. Three conductors are provided. A semi-conductive strip is provided on one side of each conductor. A conductor shielding layer is adhered to one side of the semi-conductive strip. An insulation layer is provided on one side of the conductor shielding layer. The first drying cotton layer is provided on one side of the insulation layer. An inner sheath is provided on one side of the first drying cotton layer. A wrapping tape is provided on one side of the inner sheath. Filler is placed between the wrapping tape and the inner sheath. This utility model, by providing a first drying cotton layer and a second drying cotton layer, can provide moisture protection for both the inner and outer rings of the power cable, respectively. This double-layer protection improves the moisture resistance of the power cable, prevents moisture absorption, and ensures the cable's service life.

[0004] However, this utility model only focuses on moisture-proof and shock-resistant protection for power cables during use. In the actual cable laying process, there is often a situation where the cable is stretched, which leads to low tensile strength of the cable and cannot meet production requirements. Therefore, a cross-linked polyethylene insulated and polyethylene sheathed power cable is proposed to solve the problems mentioned above. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a cross-linked polyethylene insulated and polyethylene sheathed power cable, which has the advantage of high tensile strength. It solves the problem that while focusing on moisture-proof and shock-proof protection for power cables is important, the actual cable laying process often involves stretching of the cable, resulting in low tensile strength that cannot meet production requirements.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a cross-linked polyethylene insulated and polyethylene sheathed power cable, comprising a cable conductor body, a conductor protective layer disposed on the outside of the cable conductor body, an inner protective layer disposed on the outside of the conductor protective layer, and a tensile structural layer disposed inside the inner protective layer that can improve the overall tensile strength of the cable.

[0007] The tensile structural layer includes a wrapping layer disposed outside the conductor protective layer, an armor wrapping layer disposed outside the wrapping layer, a buffer sleeve disposed on the side of the armor wrapping layer away from the wrapping layer, and a metal sleeve disposed on the side of the buffer sleeve away from the armor wrapping layer.

[0008] Furthermore, the buffer sleeve is internally fixedly connected with reinforcing ribs, and a buffer cavity is formed inside the buffer sleeve.

[0009] Furthermore, the outer surface of the wrapping layer abuts against the outer surface of the conductor protective layer, and the inner protective layer includes a tensile structural layer and a water-blocking layer, with the water-blocking layer located between the metal sheath and the buffer sheath.

[0010] Furthermore, the conductor protection layer includes a conductor shielding layer, an insulation layer, and an insulation shielding layer, wherein the conductor shielding layer abuts against the cable conductor body.

[0011] Furthermore, an insulating layer is provided on the outside of the conductor shielding layer, and an insulating shielding layer is provided on the side of the insulating layer away from the conductor shielding layer.

[0012] Furthermore, an outer protective layer is provided outside the inner protective layer, which consists of a fire-resistant layer and an outer protective sleeve.

[0013] Furthermore, the outer protective sleeve is located at the outermost layer of the outer protective layer, and the fire-resistant layer abuts against the inner protective layer.

[0014] Compared with the prior art, this utility model provides a cross-linked polyethylene insulated and polyethylene sheathed power cable, which has the following beneficial effects:

[0015] 1. This cross-linked polyethylene insulated and polyethylene sheathed power cable, by setting a wrapping layer, can wrap and fix multiple cable conductors to prevent them from becoming loose. By setting an armor wrapping layer, the power cable can withstand greater tensile force and also has good compressive strength. By setting a metal sheath, it can effectively shield the interference of external electric and magnetic fields, prevent external electromagnetic interference from affecting the electrical signals transmitted inside the cable, ensure stable power or signal transmission, and further improve tensile strength.

[0016] 2. This cross-linked polyethylene insulated and polyethylene sheathed power cable, by setting a buffer sheath, can absorb and disperse the energy when the cable is subjected to external impact or vibration, reducing the direct impact of the impact on the internal structure. At the same time, by setting a buffer cavity, the buffer sheath can have a certain degree of elasticity and deformability, which can adapt to changes in external temperature and play a compensating role. This solves the problem that if only focusing on moisture-proof and shock-resistant protection of power cables is done, but in the actual cable laying process, there is often a situation where the cable is stretched, resulting in low tensile strength of the cable and failing to meet production requirements. Attached Figure Description

[0017] Figure 1 This is a three-dimensional view of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the conductor protective layer of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the inner protective layer of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the outer protective layer of this utility model.

[0021] In the diagram: 1. Cable conductor body, 2. Conductor protective layer, 21. Conductor shielding layer, 22. Insulation layer, 23. Insulation shielding layer, 3. Inner protective layer, 31. Wrapping layer, 32. Armored wrapping layer, 33. Buffer sheath, 34. Reinforcing rib, 35. Buffer cavity, 36. Water-blocking layer, 37. Metal sheath, 4. Outer protective layer, 41. Fire-resistant layer, 42. Outer protective sleeve. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1:

[0024] Please see Figures 1 to 3This embodiment of a cross-linked polyethylene insulated and polyethylene sheathed power cable includes a cable conductor body 1, a conductor protection layer 2 disposed on the outside of the cable conductor body 1, an inner protection layer 3 disposed on the outside of the conductor protection layer 2, and an anti-tensile structural layer disposed inside the inner protection layer 3 to improve the overall tensile strength of the cable. The anti-tensile structural layer includes a wrapping layer 31 disposed on the outside of the conductor protection layer 2, an armor wrapping layer 32 disposed on the outside of the wrapping layer 31, a buffer sheath 33 disposed on the side of the armor wrapping layer 32 away from the wrapping layer 31, and a metal sheath 37 disposed on the side of the buffer sheath 33 away from the armor wrapping layer 32.

[0025] The buffer sleeve 33 has a reinforcing rib 34 fixedly connected inside, and a buffer cavity 35 is opened inside the buffer sleeve 33. The wrapping layer 31 abuts against the outer surface of the conductor protection layer 2. The inner protection layer 3 includes a tensile structural layer and a water-blocking layer 36. The water-blocking layer 36 is located between the metal sleeve 37 and the buffer sleeve 33.

[0026] It should be noted that by setting the wrapping layer 31, multiple cable conductor bodies 1 can be wrapped and fixed to prevent them from becoming loose. Furthermore, by setting the armor wrapping layer 32, the power cable can withstand greater tensile force and also has good compressive strength. Furthermore, by setting the metal sheath 37, external electric and magnetic field interference can be effectively shielded, preventing external electromagnetic interference from affecting the electrical signals transmitted inside the cable, ensuring stable power or signal transmission, and further improving tensile strength.

[0027] In this embodiment, the conductor protection layer 2 includes a conductor shielding layer 21, an insulation layer 22, and an insulation shielding layer 23. The conductor shielding layer 21 abuts against the cable conductor body 1. An insulation layer 22 is provided on the outside of the conductor shielding layer 21, and an insulation shielding layer 23 is provided on the side of the insulation layer 22 away from the conductor shielding layer 21.

[0028] Among them, the insulating layer 22 is made of cross-linked polyethylene insulating material, which has high dielectric strength, can effectively withstand high voltage, and reduce current leakage and electrolytic corrosion; it has a low dielectric loss tangent value, which can reduce the loss of electrical energy during transmission and ensure stable power transmission; the insulating shielding layer 23 is a semiconductor tape.

[0029] Example 2:

[0030] Please see Figures 1 to 4 Based on Embodiment 1, it includes an outer protective layer 4 disposed outside the inner protective layer 3. The outer protective layer 4 is composed of a fire-resistant layer 41 and an outer protective sleeve 42. The outer protective sleeve 42 is located at the outermost layer of the outer protective layer 4, and the fire-resistant layer 41 abuts against the inner protective layer 3.

[0031] In this embodiment, the refractory layer 41 is made of ceramicized silicone rubber, and the outer protective sleeve 42 is made of polyethylene.

[0032] By adopting the above technical solution, the fire-resistant layer 41 can achieve the fire-resistant effect, and the outer protective sleeve 42 can protect the cable and improve its wear and scratch resistance.

[0033] The working principle of the above embodiments is as follows:

[0034] First, the conductor protection layer 2 protects the cable conductor body 1, providing both shielding and insulation. Then, the inner protection layer 3 is installed to enable the cable to adapt to various complex environments. Finally, the outer protection layer 4 protects the outermost layer of the cable and improves its wear resistance and fire resistance.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cross-linked polyethylene insulated and polyethylene sheathed power cable, comprising a cable conductor body (1), characterized in that: The conductor body (1) of the cable is provided with a conductor protection layer (2) on the outside, and an inner protection layer (3) is provided on the outside of the conductor protection layer (2). The inner protection layer (3) is provided with a tensile structure layer that can improve the overall tensile strength of the cable. The tensile structural layer includes a wrapping layer (31) disposed outside the conductor protective layer (2), an armor wrapping layer (32) disposed outside the wrapping layer (31), a buffer sleeve (33) disposed on the side of the armor wrapping layer (32) away from the wrapping layer (31), and a metal sleeve (37) disposed on the side of the buffer sleeve (33) away from the armor wrapping layer (32).

2. The cross-linked polyethylene insulated and polyethylene sheathed power cable according to claim 1, characterized in that: The buffer sleeve (33) is fixedly connected to the inside with reinforcing ribs (34), and the buffer sleeve (33) has a buffer cavity (35) inside.

3. The cross-linked polyethylene insulated and polyethylene sheathed power cable according to claim 1, characterized in that: The wrapping layer (31) abuts against the outer surface of the conductor protection layer (2), and the inner protection layer (3) includes a tensile structural layer and a water-blocking layer (36), with the water-blocking layer (36) located between the metal sheath (37) and the buffer sheath (33).

4. The cross-linked polyethylene insulated and polyethylene sheathed power cable according to claim 1, characterized in that: The conductor protection layer (2) includes a conductor shielding layer (21), an insulation layer (22) and an insulation shielding layer (23), wherein the conductor shielding layer (21) abuts against the cable conductor body (1).

5. A cross-linked polyethylene insulated and polyethylene sheathed power cable according to claim 4, characterized in that: An insulating layer (22) is provided on the outside of the conductor shielding layer (21), and an insulating shielding layer (23) is provided on the side of the insulating layer (22) away from the conductor shielding layer (21).

6. A cross-linked polyethylene insulated and polyethylene sheathed power cable according to claim 1, characterized in that: The inner protective layer (3) is provided with an outer protective layer (4), which is composed of a fire-resistant layer (41) and an outer protective sleeve (42).

7. A cross-linked polyethylene insulated and polyethylene sheathed power cable according to claim 6, characterized in that: The outer protective sleeve (42) is located at the outermost layer of the outer protective layer (4), and the fire-resistant layer (41) abuts against the inner protective layer (3).

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