High-water-resistance cable

Abstract

The utility model discloses a high water-blocking cable, including control wire core, main wire core, insulating layer, water-blocking layer, armor layer and oversheath, the control wire core and the main wire core wrap inside the insulating layer to form a cable core, the insulating layer sequentially wrap the water-blocking layer, armor layer and oversheath, the water-blocking layer is a water-blocking tape, the armor layer is a water-blocking tape, and the oversheath is a water-blocking tape. The water-blocking tape sequentially comprises a base material layer, an expansion layer, a water absorption layer and a covering layer from inside to outside, and the component of the water absorption layer is polyenol. According to the utility model, the water absorption layer is made of polyenol, can effectively replace the existing sodium polyacrylate water absorption material, is neutral after absorbing water, can effectively avoid the phenomenon of pitting corrosion of the cable, and greatly avoids the fault of the cable.

Description

Technical Field

[0001] The utility model relates to a high water resistance cable, belonging to the technical field of cables. Background Art

[0002] With the further acceleration of my country's industrialization and informatization, the application scale of cables is increasing day by day. Among them, communication cables play an important role in the process of information transmission. Their laying cost is high, and their performance has a great impact on the quality of communication, which greatly affects the stability of communication. The water permeability of communication cables has always been a headache in the industry. Once the cable is damp, it will bring many hidden dangers to the operation of the cable. After the cable is flooded, whether it is the moisture on the surface of the plastic insulation layer or the surface of the conductor, the insulation will cause water trees along the direction of the electric field under the action of a strong electric field, causing the insulation to age faster and eventually cause cable breakdown. Cables are often damaged by mechanical stress during installation and use, or they often have the problem of water infiltration when they are used in a humid or watery environment for a long time. To solve this problem, a water-blocking structure is often used. The longitudinal water-blocking is generally water-blocking powder, water-blocking yarn or water-blocking tape, and the radial water-blocking is generally a longitudinal double-sided aluminum-plastic composite tape. At present, the common operation in the industry is to wrap the water-blocking tape between the cable core and the longitudinal double-sided aluminum-plastic composite tape to solve this technical problem. Water-blocking tape is generally composed of a base material layer, an expansion layer, a water-absorbing layer, and a covering layer. The water-absorbing layer is generally made of sodium polyacrylate. After absorbing water, the pH value of this material is mostly alkaline and solid, which can easily cause pitting corrosion of the cable and lead to water seepage in the cable. Based on the above technical background, it is urgent to develop a water-blocking cable to solve the pitting corrosion problem of the water-absorbing layer. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a high water resistance cable.

[0004] The technical solution for achieving the purpose of the utility model is: a high water-resistance cable, comprising a control core, a main core, an insulation layer, a water-blocking layer, an armor layer and an outer sheath, wherein the control core and the main core are coated inside the insulation layer to form a cable core, and the insulation layer is coated with a water-blocking layer, an armor layer and an outer sheath in sequence, wherein the water-blocking layer is a water-blocking tape, and the water-blocking tape comprises a base material layer, an expansion layer, a water-absorbing layer and a covering layer from the inside to the outside, and the water-absorbing layer is composed of polyolefin alcohol.

[0005] The water absorbing layer of the utility model adopts polyenol, which can effectively replace the existing sodium polyacrylate water absorbing material. It is neutral after absorbing water, which can effectively avoid the pitting corrosion of the cable and greatly avoid the cable failure.

[0006] Further or optionally, the cable core is twisted by two control cores and a main core, and the cross-section of the control core is 1.5 mm 2 , wherein the thickness of the insulating sheath of the control core is greater than 1.5 mm.

[0007] By setting the above parameters and twisting the cables, the core can transmit signals and small currents while reducing the skin effect of the cable conductor; a sufficiently large insulating sheath thickness can effectively prevent the insulation surface from being punctured by the control core insulation due to the current difference between the control core and the main core, thereby further improving the stability of cable performance.

[0008] Further or optionally, the volume resistivity of the insulating layer is greater than or equal to 12*10 12 It should be noted that the material is polyvinyl chloride added with dioctyl phthalate. In this way, under the premise of ensuring the qualified resistivity of the cable, the control core can effectively have greater hardness and deformation resilience, avoiding pressure deformation of the control core during the conductor twisting process.

[0009] In order to make the cable have better mechanical properties, high elongation at break and tensile strength, the outer sheath material is thermoplastic vulcanized rubber added with 3.5wt% dicumyl peroxide and 20wt% ultrafine talc.

[0010] Further or optionally, the main core is an aluminum conductor, the control core is a copper conductor, and the high-resistance water-resistant cable is obtained by twisting 2 control cores and 89 main cores in a 1+6+12+18+24+30 structure.

[0011] Further or optionally, the control core includes a copper conductor, control core insulation and a control core sheath to further improve the waterproof performance of the control core and improve the cable structure and performance stability.

[0012] By adopting the above technical solution, the utility model has the following beneficial effects:

[0013] (1) The water-absorbing layer of the utility model adopts polyolefin alcohol, which can effectively replace the existing sodium polyacrylate water-absorbing material. After absorbing water, it becomes neutral, which can effectively avoid the pitting corrosion of the cable and greatly avoid the cable failure.

[0014] (2) The cable core of the utility model is twisted between the two control wires and the main wire core, and the cross-sectional size of the control wire core and the thickness of the insulating sheath of the control wire core are set. The twisted structure can reduce the skin effect of the cable conductor while transmitting signals and small currents; the sufficiently large insulating sheath thickness can effectively prevent the insulation surface of the control wire core from being punctured due to the current difference between the control wire core and the main wire core, thereby further improving the stability of cable performance.

[0015] (3) The volume resistivity of the insulating sheath of the utility model is greater than or equal to 12*10 12, which can effectively make the control core have greater hardness and deformation resilience while ensuring the qualified resistivity of the cable, and avoid the pressure deformation of the control core during the twisting process of the conductor and the control core.

[0016] (4) The main line core of the utility model is an aluminum conductor, and the control line core is a copper conductor, which has better conductivity.

[0017] (5) The high-resistance water-resistant cable is obtained by twisting 2 control wires and 89 main wire cores in a 1+6+12+18+24+30 structure. This structure is a non-five-division conductor, which can further effectively reduce the skin effect of the cable.

[0018] (6) The control wire core of the utility model is provided with a control wire core insulation and a control wire core sheath to further enhance the waterproof performance of the control wire core and enhance the cable structure and performance stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] The reference numerals in the accompanying drawings are:

[0022] Cable core 1, control core 11, copper conductor 111, control core insulation 112, control core sheath 113, main core 12, insulation layer 2, water blocking layer 3, armor layer 4, outer sheath 5. DETAILED DESCRIPTION

[0023] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the embodiments of the present utility model, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present utility model.

[0028] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly stipulated and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the scope of protection of the utility model.

[0029] (Example 1)

[0030] See Figure 1 The high water resistance cable of this embodiment has a voltage level of 3kV AC and an overall structure of 1×1000mm 2 The power cord. Its specific structure includes a control core 11, a main core 12, an insulating layer 2, a water-blocking layer 3, an armor layer 4 and an outer sheath 5. The control core 11 and the main core 12 are coated inside the insulating layer 2 to form a cable core 1. The insulating layer 2 is coated with a water-blocking layer 3, an armor layer 4 and an outer sheath 5 in sequence. The water-blocking layer 3 is a water-blocking tape. The water-blocking tape is composed of a base material layer, an expansion layer, a water-absorbing layer and a covering layer from the inside to the outside. The water-absorbing layer is composed of polyolefin alcohol. The specific structure of the core uses two 1.5mm2 The control line core 11 is twisted together with 1289 main line cores to form a 1+6+12+18+24+30 structure.

[0031] In order to avoid insulation breakdown of the control core 11 due to the current difference between the control core 11 and the main core 12 on the insulation surface, and to effectively prevent deformation of the control core 11 during the twisting process, the insulation thickness of the control core 11 is set to be more than 1.5 mm, and dioctyl phthalate is added to its polyvinyl chloride base material to give the control core 11 greater hardness and deformation resilience.

[0032] In addition, during the preparation process, it is necessary to ensure that the volume resistivity of the insulating layer 2 is greater than or equal to 12*10 12 to ensure the overall insulation performance of the cable to overcome environmental interference.

[0033] In terms of material selection, the outer sheath 5 is made of thermoplastic vulcanized rubber added with 3.5wt% dicumyl peroxide and 20wt% ultrafine talc powder, the main core 12 is an aluminum conductor, and the control core 11 is a copper conductor.

[0034] In order to further ensure the performance stability of the water-blocking cable, a protective structure is further set for the control core 11. Specifically, the control core insulation 112 and the control core sheath 113 are covered on the outer layer of the copper conductor 111 to form effective insulation between the copper conductor 111 and the main core 12 to prevent the insulation of the control core from being punctured due to the current difference between the control core and the main core.

[0035] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high water resistance cable, characterized in that: The invention comprises a control core (11), a main core (12), an insulating layer (2), a water-blocking layer (3), an armor layer (4) and an outer sheath (5); the control core (11) and the main core (12) are coated inside the insulating layer (2) to form a cable core (1); the insulating layer (2) is coated with a water-blocking layer (3), an armor layer (4) and an outer sheath (5) in sequence; the water-blocking layer (3) is a water-blocking tape; the water-blocking tape comprises, from the inside to the outside, a base material layer, an expansion layer, a water-absorbing layer and a covering layer in sequence; the water-absorbing layer comprises polyol.

2. A high water resistance cable according to claim 1, characterized in that: The cable core (1) is twisted by two control cores (11) and a main core (12), and the cross section of the control core (11) is 1.5 mm 2 , wherein the thickness of the insulating sheath of the control core (11) is greater than 1.5 mm.

3. A high water resistance cable according to claim 2, characterized in that: The volume resistivity of the insulating layer (2) is greater than or equal to 12*10 12 .

4. A high water resistance cable according to claim 1, characterized in that: The main line core (12) is an aluminum conductor, and the control line core (11) is a copper conductor.

5. A high water resistance cable according to claim 2, characterized in that: The high-resistance water-resistant cable is obtained by twisting two control cores (11) and 89 main cores (12) together in a 1+6+12+18+24+30 structure.

6. A high water resistance cable according to claim 1, characterized in that: The control wire core (11) comprises a copper conductor (111), a control wire core insulation (112) and a control wire core sheath (113).

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