Waterproof ethylene-propylene rubber insulated low-voltage power cable

Abstract

The utility model relates to the technical field of power cables, in particular to a waterproof ethylene-propylene rubber insulation low-voltage power cable which comprises a plurality of wire cores, a plurality of insulation assemblies and a protection assembly, the insulation assemblies are in one-to-one correspondence with the wire cores, the insulation assemblies are ethylene-propylene rubber insulation layers, the ethylene-propylene rubber insulation layers are arranged on the outer sides of the wire cores in a sleeving mode, and the protection assembly is arranged on the outer sides of the wire cores. The ethylene propylene rubber insulation layers are tightly attached to the outer sides of the wire cores, the ethylene propylene rubber insulation layers and the wire cores form wires, the multiple wires form the cable, every two adjacent ethylene propylene rubber insulation layers make contact, and the protection assembly wraps the cable. The cable has the effect of effectively preventing water vapor invasion and the influence of the external environment on the cable.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of power cables, in particular to a waterproof EPR insulated low-voltage power cable. BACKGROUND

[0002] Low-voltage power cables are widely used in power transmission and distribution fields, and play an important role in low-voltage distribution systems with a rated voltage of 0.6 / 1 kV. As a key infrastructure component, low-voltage power cables not only need to have good electrical performance, but also need to meet various environmental adaptability requirements such as weather resistance, waterproofness and mechanical strength. With the development of social economy and the progress of technology, people have higher requirements for the safety and reliability of low-voltage power cables, and the ability to operate stably for a long time in complex environments has become a focus.

[0003] In order to improve the overall performance of low-voltage power cables, different types of insulation materials and protective structure designs are usually used in the industry. Common solutions include using polyvinyl chloride (PVC) or cross-linked polyethylene (XLPE) as the main material of the insulation layer, and adding a protective layer to enhance the physical properties of the cable. However, these traditional methods have certain limitations. For example, PVC insulation material is low in cost, but it is prone to aging and cracking in high-temperature environments and has a short service life. XLPE can improve these problems to some extent, but due to the high hardness of the material itself and the strict requirements of the processing technology, it may increase the difficulty of construction or cause other potential defects.

[0004] For the related technologies in the above, the existing technical level still cannot completely solve all practical problems. Especially in the case of long-term exposure to humid atmosphere or under large mechanical load, the traditional cable structure often shows obvious shortcomings. When the cable is in a working environment with high humidity or significant temperature difference, due to the lack of effective overall protection mechanism, it is easy to cause internal line short circuit or even safety accidents due to water vapor intrusion. CONTENT OF THE UTILITY MODEL

[0005] In order to overcome the above problems, the application provides a waterproof EPR insulated low-voltage power cable.

[0006] The waterproof EPR insulated low-voltage power cable provided by the application adopts the following technical scheme:

[0007] The waterproof ethylene-propylene rubber insulated low-voltage power cable comprises a plurality of cores, a plurality of insulation components and a protection component, the insulation components correspond to the cores one by one, the insulation components are ethylene-propylene rubber insulation layers, the ethylene-propylene rubber insulation layers are sleeved outside the cores, the ethylene-propylene rubber insulation layers are tightly attached to the outside of the cores, the ethylene-propylene rubber insulation layers and the cores form conductors, a plurality of conductors form a cable, adjacent two ethylene-propylene rubber insulation layers are in contact, and the protection component covers the cable.

[0008] By adopting the technical scheme, good insulation performance and waterproof performance of the cable are achieved, specifically, the use of the ethylene-propylene rubber insulation layer not only provides excellent ozone aging resistance and chemical resistance, but also ensures long-term stable operation of the cable in a complex environment, in addition, by combining a plurality of cores and corresponding insulation components to form a cable and using a protection component to cover the cable as a whole, water vapor intrusion and external environmental influence on the cable are effectively prevented, thereby improving the overall safety and reliability of the cable.

[0009] In a specific implementable scheme, the number of the cores and the number of the insulation components are both four, and the four cores are arranged in a square shape.

[0010] By adopting the technical scheme, when the cable is subjected to external pressure, stress distribution is more uniform, the possibility of local damage is effectively reduced, and the overall structural stability and pressure resistance of the cable are improved.

[0011] In a specific implementable scheme, the number of the cores and the number of the insulation components are both four, and the four cores are arranged in a star-shaped topology.

[0012] By adopting the technical scheme, when the cable is subjected to external pressure, stress can be more uniformly dispersed, effectively reducing the risk of local overpressure, thereby reducing the risk of damage and improving the overall structural stability and durability of the cable.

[0013] In a specific implementable scheme, the protection component comprises a shielding layer, a filler and a sheath layer, the shielding layer adopts a copper wire woven mesh structure, the shielding layer wraps the cable, the filler is filled between adjacent two ethylene-propylene rubber insulation layers, the sheath layer covers the shielding layer, and the sheath layer is used to protect the shielding layer.

[0014] By adopting the technical scheme, the shielding layer in the copper wire woven mesh structure can provide high-density electromagnetic shielding effect, effectively reducing the risk of signal interference, while taking into account flexibility and shielding efficiency, the sheath layer is wrapped outside the shielding layer, forming double protection, and the overall protection capability of the cable is significantly improved, prolonging the service life.

[0015] In one specific implementation, the protection assembly further comprises a buffer layer and a plurality of buffer members, the buffer layer is located between the shielding layer and the sheath layer, the buffer layer comprises a first buffer sleeve, a second buffer sleeve and a plurality of support rods, the first buffer sleeve is tightly attached to the outside of the shielding layer, the second buffer sleeve is sleeved outside the first buffer sleeve, a buffer gap is left between the second buffer sleeve and the first buffer sleeve, and the plurality of support rods are located in the buffer gap, the plurality of support rods are uniformly distributed along the circumference of the first buffer sleeve, the support rods are arranged along the length direction of the core, one side of the support rods is connected to the first buffer sleeve, and the other side of the support rods faces the second buffer sleeve, and the plurality of support rods divide the buffer gap into a plurality of expansion gaps.

[0016] The plurality of buffer members are uniformly distributed in the plurality of expansion gaps, and the plurality of buffer members located in the expansion gaps are distributed along the length direction of the core, the buffer member comprises a buffer plate, the buffer plate is arranged in an arc shape, both ends of the buffer plate are connected to the first buffer sleeve, and both ends of the buffer plate are close to one of the support rods, the buffer plate is arranged along the arc direction of the first buffer sleeve, and the top of the buffer plate is connected to the second buffer sleeve.

[0017] By adopting the above technical solution, multi-stage buffer protection of the cable under external force is realized. Specifically, the buffer gap between the first buffer sleeve and the second buffer sleeve cooperates with the separation effect of the support rods to form a plurality of independent expansion gaps, effectively dispersing external pressure; the arc-shaped buffer plate has both ends connected to the first buffer sleeve and the second buffer sleeve, which can elastically deform under pressure to absorb impact energy, thereby reducing the impact on the internal core; in addition, the position distribution of the buffer plate further optimizes the force conduction path, improving the pressure resistance and stability of the overall structure.

[0018] In one specific implementation, the buffer member further comprises an elastic strip, the elastic strip is located on the side of the buffer plate close to the first buffer sleeve, the setting direction of the elastic strip is consistent with the length direction of the core, the elastic strip is connected to the first buffer sleeve, and the side of the elastic strip away from the first buffer sleeve abuts against the buffer plate.

[0019] By adopting the above technical solution, the setting of the elastic strip can provide additional elastic support when the buffer plate is subjected to pressure. Specifically, when external pressure acts on the sheath layer and is conducted to the buffer plate, the elastic strip will be compressed, thereby absorbing part of the energy and reducing the deformation degree of the buffer plate. This design effectively improves the overall pressure resistance of the cable and prolongs the service life. At the same time, since the elastic strip is connected to the first buffer sleeve and arranged along the length direction of the core, it can also ensure that the pressure distribution is more uniform, avoiding structural damage caused by local stress concentration.

[0020] In one specific implementation, the support rod is provided with a clearance gap on one side facing the second buffer sleeve.

[0021] By adopting the above technical solution, the hard collision of the support rod directly contacting the second buffer sleeve when the cable is subjected to external pressure can be avoided, which effectively improves the overall buffering performance of the buffer layer and ensures the reliability and durability of the cable under external force.

[0022] In one specific implementation, a spiral reinforcing rib is additionally provided outside the sheath layer.

[0023] By adopting the above technical solution, the mechanical strength of the cable is increased, which can better withstand the stress caused by bending and stretching.

[0024] In summary, the present application has at least one of the following beneficial technical effects:

[0025] 1. The designed waterproof EPR insulated low-voltage power cable uses an EPR insulation layer, which not only provides excellent ozone aging resistance and chemical resistance, but also ensures long-term stable operation of the cable in complex environments. In addition, by combining multiple cores with corresponding insulation components to form a cable and using a protective component to overall cover the cable, the influence of water vapor and external environment on the cable is effectively prevented, thereby improving the overall safety and reliability of the cable.

[0026] 2. The designed waterproof EPR insulated low-voltage power cable makes the stress distribution of the cable more uniform when subjected to external pressure, effectively reducing the possibility of local damage and improving the overall structural stability and pressure resistance of the cable.

[0027] 3. The designed waterproof EPR insulated low-voltage power cable has an arch-shaped buffer plate connected to the first and second buffer sleeves at both ends, which can produce elastic deformation under pressure to absorb impact energy and reduce the impact on the internal cores. In addition, the position distribution of the buffer plate further optimizes the force transmission path, improving the overall structural pressure resistance and stability. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the overall structure in Example 1.

[0029] Figure 2 is a schematic diagram of the buffer in Example 1.

[0030] Figure 3 is a schematic diagram of the overall structure in Example 2.

[0031] Explanation of reference numerals in the attached drawings: 1. Core wire; 2. Insulation component; 3. Protection component; 31. Shielding layer; 32. Filler; 33. Buffer layer; 331. First buffer sleeve; 332. Second buffer sleeve; 333. Support rod; 34. Buffer component; 341. Buffer plate; 342. Elastic strip; 35. Sheath layer; 351. Spiral reinforcing rib. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail.

[0033] This application discloses a waterproof ethylene propylene rubber insulated low-voltage power cable.

[0034] Example 1

[0035] Reference Figure 1 A waterproof ethylene propylene rubber insulated low-voltage power cable includes multiple conductors 1, multiple insulation components 2, and a protection component 3. The insulation components 2 and conductors 1 are both located inside the protection component 3, and the insulation components 2 are located on the conductors 1.

[0036] Reference Figure 1 In this embodiment, there are four wire cores 1 arranged in a square. This structural design makes the stress distribution more uniform when the cable is subjected to external pressure, reducing the possibility of local damage. The wire core 1 can be a copper conductor or an aluminum conductor. For example, a tin-plated copper conductor with a diameter of 3 mm can be selected as the material of the wire core 1. Tin-plated copper not only has good conductivity, but also enhances corrosion resistance. At the same time, the gap between adjacent wire cores 1 is sealed by filling with moisture-proof foam material to prevent moisture intrusion and electrical failure.

[0037] Reference Figure 1 The insulation component 2 corresponds one-to-one with the wire core 1. The insulation component 2 is an ethylene propylene rubber insulation layer, which is sleeved on the outside of the wire core 1 and closely adheres to the outside of the wire core 1. The radial distance range is 2 mm to 4 mm. This thickness can ensure sufficient insulation effect while reducing material cost. Ethylene propylene rubber itself has excellent ozone aging resistance and chemical resistance, making it suitable for long-term exposure to complex environments. To further improve service life, an appropriate amount of antioxidant particles, such as vitamin E derivatives or other stabilizers, can be added inside the insulation layer to delay the performance degradation caused by oxidation.

[0038] Reference Figure 1 and Figure 2The protective component 3 includes a shielding layer 31, a filler 32, a buffer layer 33, multiple buffers 34, and a sheath layer 35. The shielding layer 31 adopts a copper wire braided mesh structure with a density of not less than 80%. The high-density braiding improves electromagnetic compatibility and effectively reduces the risk of signal interference. In addition, the design of the braided mesh also takes into account the balance between flexibility and shielding efficiency. The ethylene propylene rubber insulation layer and the wire core 1 form a conductor, and the four conductors form a cable. The shielding layer 31 wraps the cable, and two adjacent ethylene propylene rubber insulation layers are in contact. The side of the ethylene propylene rubber insulation layer away from the wire core 1 is in close contact with the side wall of the shielding layer 31. The shielding layer 31 can fix the four conductors. The filler 32 is located between two adjacent ethylene propylene rubber insulation layers. In this embodiment, the filler 32 uses a closed-cell foamed silicone material. This material has both lightweight and efficient moisture absorption and protection functions, and can maintain stable physical properties even in humid environments. In addition, the closed-cell structure gives the material a high compression rebound recovery capability, thereby ensuring long-term reliability.

[0039] Reference Figure 1 and Figure 2The buffer layer 33 is located outside the shielding layer 31. The buffer layer 33 includes a first buffer sleeve 331, a second buffer sleeve 332, and multiple support rods 333. The first buffer sleeve 331 is fitted onto the outside of the shielding layer 31, and the inner wall of the first buffer sleeve 331 is tightly bonded to the outer side of the shielding layer 31. The second buffer sleeve 332 is fitted onto the outside of the first buffer sleeve 331, and a buffer gap is left between the second buffer sleeve 332 and the first buffer sleeve 331. The multiple support rods 333 are all located within the buffer gap, and the multiple support rods 333 are along the first buffer sleeve 331. The buffer sleeves 331 are evenly distributed circumferentially. Support rods 333 are arranged along the length of the core 1. One side of the support rod 333 is bonded to the first buffer sleeve 331, and the other side faces the second buffer sleeve 332. A clearance is left between the support rod 333 and the second buffer sleeve 332. Multiple support rods 333 divide the buffer gap into multiple telescopic gaps. Multiple buffer elements 34 are evenly distributed within the multiple telescopic gaps. The multiple buffer elements 34 located within the telescopic gaps are spaced apart along the length of the core 1. 4 includes a buffer plate 341 and an elastic strip 342. The buffer plate 341 is arched, and both ends of the buffer plate 341 are fixed to the first buffer sleeve 331 by adhesive bonding. Each end of the buffer plate 341 is close to a support rod 333. The buffer plate 341 is set along the arc direction of the first buffer sleeve 331. The elastic strip 342 is located on the side of the buffer plate 341 close to the first buffer sleeve 331. The setting direction of the elastic strip 342 is consistent with the length direction of the wire core 1. The elastic strip 342 is fixedly bonded to the first buffer sleeve 331. 2. The side away from the first buffer sleeve 331 abuts against the buffer plate 341. The top of the buffer plate 341 is bonded to the inner wall of the second buffer sleeve 332. In this embodiment, the buffer plate 341 is an elastic plate. When there is a certain pressure on the outside, the pressure is transmitted to the second buffer sleeve 332. At this time, the second buffer sleeve 332 pushes the buffer plate 341, the elastic strip 342 is squeezed, and the second buffer sleeve 332 contacts the support rod 333. Subsequently, the first buffer sleeve 331 and the second buffer sleeve 332, along with the shielding layer 31, squeeze the ethylene propylene rubber insulation layer to complete the buffering.

[0040] Reference Figure 1 The sheath layer 35 is fitted outside the second buffer sleeve 332 and is in close contact with the second buffer sleeve 332. The sheath layer 35 is made of polyolefin modified plastic mixed with carbon black powder and has excellent flame retardant properties. The sheath layer 35 protects the internal structure. A spiral reinforcing rib 351 is added to the outside of the sheath layer 35. The height of the spiral reinforcing rib 351 is measured in the direction perpendicular to the surface of the sheath layer 35 and ranges from 1 mm to 3 mm. The spiral reinforcing rib 351 increases the mechanical strength of the cable and makes it more able to withstand the stress caused by bending and stretching.

[0041] The implementation principle of Example 1 is as follows: In application, the shielding layer 31 wraps the cable, the filler 32 fills the space between two adjacent EPDM rubber insulation layers, the buffer layer 33 wraps the shielding layer 31, and the sheath layer 35 wraps the buffer layer 33, thus completing the cable manufacturing. Subsequently, the cable is installed and put into use. When there is a certain pressure on the outside, the pressure is transmitted to the second buffer sleeve 332. At this time, the second buffer sleeve 332 pushes the buffer plate 341, the elastic strip 342 is squeezed, and the second buffer sleeve 332 contacts the support rod 333. Subsequently, the first buffer sleeve 331 and the second buffer sleeve 332, along with the shielding layer 31, squeeze the EPDM rubber insulation layer to complete the buffering.

[0042] Example 2

[0043] Reference Figure 3 The difference between this embodiment and embodiment 1 is that the four wire cores 1 are arranged in a star topology. This method can better disperse concentrated stress and reduce the risk of damage caused by excessive local pressure.

[0044] The implementation principle of Example 2 is as follows: by improving the layout of core 1, the overall structural stability of the cable is further optimized, making it particularly suitable for occasions where frequent movement or limited installation space is required. The star topology structure exhibits better adaptability.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A water resistant EPR insulated low voltage power cable characterized in that: The cable comprises a plurality of cores (1), a plurality of insulation components (2) and a protection component (3), the insulation component (2) corresponds to the core (1) one by one, the insulation component (2) is an ethylene-propylene rubber insulation layer, the ethylene-propylene rubber insulation layer is sleeved outside the core (1), the ethylene-propylene rubber insulation layer is tightly attached to the outside of the core (1), the ethylene-propylene rubber insulation layer and the core (1) form a wire, a plurality of wires form a cable, and two adjacent ethylene-propylene rubber insulation layers are in contact, and the protection component (3) covers the cable.

2. A waterproof EPR insulated low voltage power cable according to claim 1, characterized in that: The number of the core (1) and the insulation component (2) is four, and the four cores (1) are arranged in a square shape.

3. A waterproof EPR insulated low voltage power cable according to claim 1, characterized in that: The number of the core (1) and the insulation component (2) is four, and the four cores (1) are arranged in a star-shaped topological structure.

4. A waterproof EPR insulated low voltage power cable according to any one of claims 1 to 3, characterized in that: The protection component (3) comprises a shielding layer (31), a filler (32) and a sheath layer (35), the shielding layer (31) adopts a copper wire woven mesh structure, the shielding layer (31) wraps the cable, the filler (32) is filled between two adjacent ethylene-propylene rubber insulation layers, and the sheath layer (35) covers the shielding layer (31), and the sheath layer (35) is used for protecting the shielding layer (31).

5. A waterproof EPR insulated low voltage power cable according to claim 4, characterized in that: The protection component (3) further comprises a buffer layer (33) and a plurality of buffer pieces (34), the buffer layer (33) is located between the shielding layer (31) and the sheath layer (35), the buffer layer (33) comprises a first buffer sleeve (331), a second buffer sleeve (332) and a plurality of support rods (333), the first buffer sleeve (331) is tightly attached to the outside of the shielding layer (31), the second buffer sleeve (332) is sleeved outside the first buffer sleeve (331), a buffer gap is left between the second buffer sleeve (332) and the first buffer sleeve (331), and the plurality of support rods (333) are located in the buffer gap, the plurality of support rods (333) are uniformly distributed along the circumference of the first buffer sleeve (331), the support rods (333) are arranged along the length direction of the core (1), one side of the support rod (333) is connected to the first buffer sleeve (331), the other side faces the second buffer sleeve (332), and the plurality of support rods (333) divide the buffer gap into a plurality of expansion gaps. The plurality of buffer pieces (34) are uniformly distributed in the plurality of expansion gaps, the buffer pieces (34) located in the expansion gaps are distributed along the length direction of the core (1), the buffer piece (34) comprises a buffer plate (341), the buffer plate (341) is arranged in an arc shape, both ends of the buffer plate (341) are connected to the first buffer sleeve (331), and both ends of the buffer plate (341) are close to the support rod (333).

6. A waterproof EPR insulated low voltage power cable according to claim 5, characterized in that: The buffer piece (34) further comprises an elastic strip (342) located on the side of the buffer plate (341) close to the first buffer sleeve (331), the setting direction of the elastic strip (342) is consistent with the length direction of the wire core (1), the elastic strip (342) is connected with the first buffer sleeve (331), and the side, away from the first buffer sleeve (331), of the elastic strip (342) abuts against the buffer plate (341).

7. A waterproof EPR insulated low voltage power cable according to claim 5, characterized in that: The support rod (333) is provided with a clearance gap on the side close to the second buffer sleeve (332).

8. A waterproof EPR insulated low voltage power cable according to claim 4, characterized in that: The sheath layer (35) is additionally provided with a spiral reinforcing rib (351) outside.

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