Longitudinal water-blocking vibration-damping type deep well waterproof cable

Abstract

The utility model discloses a longitudinal water-blocking and vibration-damping type deep well waterproof cable, which comprises an inner-layer cable core body formed by three insulating cable cores surrounding a central water-blocking and vibration-damping core tube and intertwisting with an inner-layer water-blocking and vibration-damping core tube, and a nylon resin longitudinal wrapping water-blocking inner dielectric layer is wrapped outside the inner-layer cable core body. The nine insulating wire cores surround the nylon resin longitudinally-wrapped water-blocking inner dielectric layer and are stranded with the outer water-blocking vibration-damping core tube to form an outer wire core body, and the outer wire core body is sequentially coated with a nylon resin longitudinally-wrapped water-blocking middle dielectric layer, an extruded lead sleeve anticorrosive layer, a nylon resin longitudinally-wrapped water-blocking outer dielectric layer, a galvanized steel tape armor layer and an NBR outer sheath. And a polypropylene moisture-absorbing core material is sleeved in the water-blocking vibration-reducing core tube. The cable has excellent waterproof and anti-corrosion performance, adapts to the working condition environment of long-term water immersion under large water pressure, is balanced and stable in cable core structure, high in mechanical strength and better in vibration reduction performance, reduces the load borne by each wire core, prevents wire breakage, and is durable in use.

Description

Technical Field

[0001] The present application belongs to the field of cable technology, and in particular relates to a longitudinal water-blocking and vibration-reducing deep-well waterproof cable. Background Art

[0002] The wire and cable industry is the second largest industry in China after the automobile industry, with a product variety satisfaction rate and domestic market share exceeding 90%. Globally, China's total output value of wires and cables has made it the world's largest wire and cable producer. With the rapid development of China's wire and cable industry, the overall technical level of the industry has been greatly improved. In the application scope of waterproof rubber sheathed soft cables, for example, deep well waterproof cables are used in the connection and control of submersible pumps, underwater lighting, floating switches, etc. The working environment requires the cable to be immersed in water for a long time and have good electrical insulation performance under high water pressure. The sheath material is required to absorb less water under water pressure, the cable bending performance is required to be high, and it can withstand frequent movement. Ordinary waterproof rubber sheathed soft cables use a spirally wrapped water-blocking layer, which has a relatively general water-blocking performance and cannot withstand long-term immersion and long-term work under high water pressure. Moreover, when subjected to frequent movement, it does not have good vibration reduction performance. The cable core structure is prone to deformation under vibration, and the mechanical strength is weakened, resulting in core cross-linking, core breakage and wire breakage. The electrical characteristics are unstable, affecting normal work. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present application is to provide a longitudinal water-blocking and vibration-reducing deep-well waterproof cable, which has excellent waterproof and corrosion-resistant properties and is adaptable to working conditions of long-term immersion in water under high water pressure. The cable core structure is balanced and stable, the mechanical strength is high, the vibration-reducing performance is better, the load on each core is reduced, the wire breakage is prevented, and the cable is durable.

[0004] This application solves the above technical problems through the following technical solutions.

[0005] A longitudinal water-blocking and vibration-damping deep-well waterproof cable comprises three insulating cores which are wrapped around a central water-blocking and vibration-damping core tube and are twisted together with an inner water-blocking and vibration-damping core tube to form an inner core body, the inner core body is coated with a nylon resin longitudinally wrapped water-blocking inner dielectric layer, nine insulating cores are wrapped around the nylon resin longitudinally wrapped water-blocking inner dielectric layer and are twisted together with an outer water-blocking and vibration-damping core tube to form an outer core body, the outer core body is sequentially coated with a nylon resin longitudinally wrapped water-blocking intermediate dielectric layer, an extruded lead sheath anti-corrosion layer, a nylon resin longitudinally wrapped water-blocking outer dielectric layer, a galvanized steel belt armor layer and an NBR outer sheath, the central water-blocking and vibration-damping core tube, the inner water-blocking and vibration-damping core tube and the outer water-blocking and vibration-damping core tube are all sheathed with a polypropylene moisture-absorbing core material, and the insulating core comprises an inner conductor, an EVA water-blocking adhesive layer, an EPDM insulating layer and a butyl rubber water-blocking and pressure-reducing longitudinal sheath.

[0006] Preferably, the inner conductor is formed by twisting a plurality of tinned copper wires, and the diameter of the tinned copper wires is 0.05 mm to 0.08 mm.

[0007] Preferably, the inner conductor lay length is 4 to 12 times the outer diameter of the inner conductor.

[0008] Preferably, the outer diameter of the inner conductor does not exceed 3.5 mm.

[0009] Preferably, the polypropylene moisture-absorbing core material is a plurality of polypropylene fibers twisted together and hot-melt-bonded with thermoplastic EVA resin into one.

[0010] Preferably, the thickness of the EVA water-blocking adhesive layer is 3 μm to 5 μm.

[0011] Preferably, the central water-blocking and vibration-damping core tube, the inner layer water-blocking and vibration-damping core tube and the outer layer water-blocking and vibration-damping core tube all comprise an inner cylindrical body and an outer cylindrical body, and a plurality of connecting ribs are evenly distributed radially between the inner cylindrical body and the outer cylindrical body.

[0012] Preferably, the lay direction of the inner layer wire core is the same as that of the outer layer wire core, and the lay pitch of the inner layer wire core is smaller than the lay pitch of the outer layer wire core.

[0013] Preferably, the thickness of the anti-corrosion layer of the extruded lead sheath is 0.1 mm to 0.3 mm.

[0014] Preferably, the nylon resin longitudinally wrapped water-blocking inner dielectric layer, the nylon resin longitudinally wrapped water-blocking middle dielectric layer and the nylon resin longitudinally wrapped water-blocking outer dielectric layer are all multi-layer nylon resin longitudinally wrapped overlapping structures with an overlapping rate of not less than 25%.

[0015] Beneficial effects of this application:

[0016] 1. By arranging three and nine identical insulating cores in two layers and forming a cable core structure together with the center, inner and outer water-blocking and vibration-damping core tubes, the cable core structure is made more round, balanced and stable, which helps to improve the mechanical strength. Keeping the inner core twist direction the same as the outer core twist direction, and the inner core twist pitch being smaller than the outer core twist pitch is beneficial to increasing the flexibility and bending resistance of the cable. The water-blocking and vibration-damping core tube, for example, adopts a cross-linked fluororubber elastomer, which has good physical and mechanical properties and high elasticity, which helps to improve the vibration reduction performance of the cable. When the cable is moved, it helps to reduce the vibration load borne by each core, suppress wire and core breakage, and ensure stable electrical characteristics. In addition, by arranging a polypropylene moisture-absorbing core material in each water-blocking and vibration-damping core tube, it helps to enhance the prevention of water vapor from penetrating into the insulation layer of each core, delay the water tree aging phenomenon of the insulation layer, and at the same time take into account the improvement of vibration reduction performance and tensile resistance, better flexibility, and improved cable durability.

[0017] 2. By adding an EVA water-blocking adhesive layer between the inner conductor and the EPDM insulation layer, it is beneficial to prevent water vapor from diffusing into the insulation layer. The nylon resin longitudinal water-blocking inner, middle and outer dielectric layers and the butyl rubber water-blocking decompression longitudinal sheath are used in combination to prevent water vapor from diffusing into the cable core layer by layer. The longitudinal sheath structure has better water-blocking performance and better bending resistance. By adding an extruded lead sheath anti-corrosion layer, it can be applied to working environments where hydrocarbons may exist, and has better corrosion resistance and chemical resistance. The lead sheath can enhance the resistance to aliphatic hydrocarbons and aromatic hydrocarbons, and effectively prevent seawater and sewage corrosion. The NBR outer sheath has excellent oil resistance, chemical corrosion resistance, wear resistance and air tightness.

[0018] 3. The extruded lead sheath anti-corrosion layer is protected by the nylon resin longitudinally wrapped water-blocking outer dielectric layer. When the cable is bent, corresponding slippage occurs, thereby preventing the extruded lead sheath anti-corrosion layer from cracking. The addition of a galvanized steel belt armor layer is beneficial to increasing the mechanical protection performance, and is suitable for installation in deep wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0020] Description of reference numerals:

[0021] 1-insulated wire core, 2-central water-blocking and vibration-damping core tube, 3-inner water-blocking and vibration-damping core tube, 4-inner wire core body, 5-nylon resin longitudinally wrapped water-blocking inner dielectric layer, 6-outer water-blocking and vibration-damping core tube, 7-outer wire core body, 8-nylon resin longitudinally wrapped water-blocking intermediate dielectric layer, 9-extruded lead sheath anti-corrosion layer, 10-nylon resin longitudinally wrapped water-blocking outer dielectric layer, 11-galvanized steel tape armor layer, 12-NBR outer sheath, 13-polypropylene moisture-absorbing core material, 14-inner conductor, 15-EVA water-blocking adhesive layer, 16-EPDM insulation layer, 17-butyl rubber water-blocking and pressure-reducing longitudinal sheath. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0023] See also Figure 1The longitudinal water-blocking and vibration-damping deep-well waterproof cable of the embodiment of the present application comprises three insulating cores 1 surrounding a central water-blocking and vibration-damping core tube 2 and twisted together with an inner water-blocking and vibration-damping core tube 3 to form an inner core body 4, the inner core body 4 is coated with a nylon resin longitudinally wrapped water-blocking inner dielectric layer 5, nine insulating cores 1 surrounding the nylon resin longitudinally wrapped water-blocking inner dielectric layer 5 and twisted together with an outer water-blocking and vibration-damping core tube 6 to form an outer core body 7, further, the inner core body 4 has the same twist direction as the outer core body 7, and the inner core body 4 has a smaller twist length than the outer core body 7. The central water-blocking and vibration-damping core tube 2, the inner water-blocking and vibration-damping core tube 3 and the outer water-blocking and vibration-damping core tube 6 are all sleeved with a polypropylene moisture-absorbing core material 13, specifically, the polypropylene moisture-absorbing core material 13 is a plurality of polypropylene fibers twisted and hot-melt-bonded with a thermoplastic EVA resin into one body. In one embodiment, the central water-blocking and vibration-damping core tube 2, the inner layer water-blocking and vibration-damping core tube 3 and the outer layer water-blocking and vibration-damping core tube 6 all include an inner cylinder and an outer cylinder, and a plurality of connecting ribs are evenly distributed radially between the inner cylinder and the outer cylinder. The insulated wire core 1 includes an inner conductor 14, an EVA water-blocking adhesive layer 15, an EPDM insulating layer 16 and a butyl rubber water-blocking and pressure-reducing longitudinal sheath 17. Specifically, the inner conductor 14 is composed of a plurality of tinned copper wires twisted together, and the diameter of the tinned copper wire is 0.05 mm to 0.08 mm. Further, the twist pitch of the inner conductor 14 is 4 to 12 times the outer diameter of the inner conductor 14. The outer diameter of the inner conductor 14 does not exceed 3.5 mm. The thickness of the EVA water-blocking adhesive layer 15 is 3 μm to 5 μm.

[0024] The outer layer wire core 7 is coated with a nylon resin longitudinally wrapped water-blocking intermediate dielectric layer 8, an extruded lead sheath anti-corrosion layer 9, a nylon resin longitudinally wrapped water-blocking outer dielectric layer 10, a galvanized steel belt armor layer 11 and an NBR outer sheath 12 in sequence, and the extruded lead sheath anti-corrosion layer 9 has a thickness of 0.1 mm to 0.3 mm. The nylon resin longitudinally wrapped water-blocking inner dielectric layer 5, the nylon resin longitudinally wrapped water-blocking intermediate dielectric layer 8 and the nylon resin longitudinally wrapped water-blocking outer dielectric layer 10 are all multi-layer nylon resin longitudinally wrapped overlapping structures, and the overlapping rate is not less than 25%.

[0025] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. Longitudinal water-blocking and vibration-reducing deep-well waterproof cable, characterized by: The invention comprises three insulating wire cores (1) surrounding a central water-blocking vibration-damping core tube (2) and being twisted together with an inner water-blocking vibration-damping core tube (3) to form an inner wire core body (4), the inner wire core body (4) being coated with a nylon resin longitudinally wrapped water-blocking inner dielectric layer (5), nine insulating wire cores (1) surrounding the nylon resin longitudinally wrapped water-blocking inner dielectric layer (5) and being twisted together with an outer water-blocking vibration-damping core tube (6) to form an outer wire core body (7), the outer wire core body (7) being coated with nylon resin longitudinally wrapped water-blocking intermediate dielectric layers (8) in sequence. , an extruded lead sheath anti-corrosion layer (9), a nylon resin longitudinally wrapped water-blocking outer dielectric layer (10), a galvanized steel belt armor layer (11) and an NBR outer sheath (12); the central water-blocking and vibration-damping core tube (2), the inner water-blocking and vibration-damping core tube (3) and the outer water-blocking and vibration-damping core tube (6) are all sheathed with a polypropylene moisture-absorbing core material (13); the insulated wire core (1) comprises an inner conductor (14), an EVA water-blocking adhesive layer (15), an EPDM insulating layer (16) and a butyl rubber water-blocking and pressure-reducing longitudinal sheath (17).

2. The longitudinal water-blocking and vibration-reducing deep-well waterproof cable according to claim 1 is characterized by: The inner conductor (14) is composed of a plurality of tinned copper wires twisted together, and the diameter of the tinned copper wires is 0.05 mm to 0.08 mm.

3. The longitudinal water-blocking and vibration-reducing deep-well waterproof cable according to claim 2 is characterized by: The inner conductor (14) has a lay length that is 4 to 12 times the outer diameter of the inner conductor (14).

4. The longitudinal water-blocking and vibration-reducing deep-well waterproof cable according to claim 1 is characterized by: The outer diameter of the inner conductor (14) does not exceed 3.5 mm.

5. The longitudinal water-blocking and vibration-reducing deep-well waterproof cable according to claim 1 is characterized by: The polypropylene moisture-absorbing core material (13) is a plurality of polypropylene fibers twisted together and hot-melt-bonded with thermoplastic EVA resin into one body.

6. The longitudinal water-blocking and vibration-reducing deep-well waterproof cable according to claim 1 is characterized by: The EVA water-blocking adhesive layer (15) has a thickness of 3 μm to 5 μm.

7. The longitudinal water-blocking and vibration-reducing deep-well waterproof cable according to claim 1 is characterized by: The central water-blocking and vibration-damping core tube (2), the inner layer water-blocking and vibration-damping core tube (3) and the outer layer water-blocking and vibration-damping core tube (6) all comprise an inner cylindrical body and an outer cylindrical body, and a plurality of connecting ribs are evenly distributed radially between the inner cylindrical body and the outer cylindrical body.

8. The longitudinal water-blocking and vibration-reducing deep-well waterproof cable according to claim 1 is characterized by: The inner layer wire core (4) has the same lay direction as the outer layer wire core (7), and the lay length of the inner layer wire core (4) is smaller than the lay length of the outer layer wire core (7).

9. The longitudinal water-blocking and vibration-reducing deep-well waterproof cable according to claim 1 is characterized by: The thickness of the extruded lead sheath anti-corrosion layer (9) is 0.1 mm to 0.3 mm.

10. The longitudinal water-blocking and vibration-reducing deep-well waterproof cable according to claim 1 is characterized by: The nylon resin longitudinally wrapped water-blocking inner dielectric layer (5), the nylon resin longitudinally wrapped water-blocking middle dielectric layer (8) and the nylon resin longitudinally wrapped water-blocking outer dielectric layer (10) are all multi-layer nylon resin longitudinally wrapped overlapping structures, and the overlapping rate is not less than 25%.

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