Bending-resistant high-voltage cable

Abstract

The invention discloses a bending-resistant high-voltage cable, and relates to the field of cables, the bending-resistant high-voltage cable comprises a cable sheath and cable cores, a plurality of cable cores are arranged, iron wires and fixing parts are arranged in the cable sheath, a plurality of iron wires are arranged, and the fixing parts are used for fixing the plurality of iron wires at the same time to form a screen frame structure. According to the bending-resistant high-voltage cable disclosed by the invention, the purposes of anti-interference shielding and bending resistance are achieved on the basis of the design of the screen frame structure; the design based on the screen frame structure can also achieve the purpose of positioning the iron wires and the cable cores, and the problem of twisting of the iron wires or the cable cores is avoided. The net frame structure is fixed through the fixing piece, the fixing piece is simple in structure, capable of being produced in batches and reasonable in structural design, the net frame structure with the fixed structure is formed based on combination of the net frame structure and the fixing piece, cable cores are convenient to install, the installation efficiency is high, the cable cores are horizontally distributed, and the twisting problem cannot occur.

Description

Technical Field

[0001] The invention relates to the field of cables, and in particular to a high-voltage cable that is resistant to bending. Background Art

[0002] ‌The bending resistance of high-voltage cables depends on their design and materials. Some high-voltage cables can have better bending resistance through special design.‌ When high-voltage cables are produced in factories, they are usually bent using a preset curve mold to meet the standard requirements for the cable bending radius. The cables can be bent within a certain radius without affecting their performance and service life. Therefore, some small bends under normal circumstances will not have much impact on the cable insulation.

[0003] However, in actual use, the bending resistance of high-voltage cables is affected by many factors. Some monitoring data show that the insulation of cables that are often fixed in one position and in a bent state ages much faster than that of cables in unbent parts. Long-term bending may cause aging and deterioration of the cable shell and insulation, and cause cable failure in later use.

[0004] In order to improve the bending resistance of high-voltage cables, it is necessary to propose a bending-resistant high-voltage cable to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a high-voltage cable that is resistant to bending, thereby improving the resistant performance of the high-voltage cable.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a bending-resistant high-voltage cable, comprising a cable sheath and a cable core, wherein a plurality of cable cores are provided, and iron wires and fixings are provided inside the cable sheath, wherein a plurality of iron wires are provided, and the fixings are used to fix the plurality of iron wires at the same time and form a mesh frame structure, wherein the plurality of cable cores are fixed by the mesh frame structure and the cable cores are distributed in parallel along the length direction of the cable sheath.

[0007] Preferably, the fixing piece is coated with glue, and the fixing piece is bonded and fixed to the outer surface of the cable core and the inner surface of the cable sheath.

[0008] Preferably, the fixing member includes a first clamping ring and a second clamping ring, the first clamping ring is distributed in the middle area between multiple cable cores, the second clamping ring is distributed at the outer ring of the cable core, one first clamping ring is provided, and several second clamping rings are provided, and the first clamping ring and the second clamping rings and adjacent second clamping rings are connected by connecting rods.

[0009] Preferably, the connecting rod is elastic.

[0010] Preferably, a first grounding component is installed on the cable sheath, and the first grounding component is fixed to the cable sheath by using an insulating tape; The first grounding component includes a connecting sleeve, which is a cylindrical structure. A telescopic conductive block is slidably arranged on the upper end of the interior of the connecting sleeve, and a transfer fixed conductive block is fixedly arranged on the lower end of the interior of the connecting sleeve. The second conductive end and the first conductive end are fixedly arranged on the upper and lower surfaces of the transfer fixed conductive block, respectively. A spring is also fixedly arranged on the upper surface of the transfer fixed conductive block. The spring sleeve is arranged on the outside of the second conductive end, and the upper end of the spring is fixed to the bottom of the telescopic conductive block. A telescopic groove is arranged on the lower surface of the telescopic conductive block. The upper end of the second conductive end movably extends into the telescopic groove, and an internal thread is arranged on the inner wall of the lower end of the connecting sleeve.

[0011] Preferably, an elastic skirt is fixedly provided at the outer ring of the upper end of the connecting sleeve, and the elastic skirt is elastic.

[0012] Preferably, the first grounding component is used in conjunction with the second grounding component; The second grounding component comprises an insulating layer, a conductive core is arranged inside the insulating layer, a power connection groove is arranged on the end surface of the conductive core, and an external thread is arranged at the outer ring of the conductive core.

[0013] Preferably, the external thread and the internal thread cooperate with each other, and the electrical connection slot and the first conductive end cooperate with each other.

[0014] Preferably, the interior of the cable sheath is filled with talcum powder.

[0015] Preferably, the fixing members are provided in a plurality of groups, and the plurality of groups of fixing members are distributed at equal distances along the length direction of the iron wire.

[0016] Technical effects and advantages of the present invention: The bending-resistant high-voltage cable of the present invention realizes the purpose of taking into account both anti-interference shielding and bending resistance based on the design of the mesh frame structure; The design based on the mesh frame structure in the present invention can also serve the purpose of positioning the iron wire and the cable core, thereby avoiding the problem of twisting of the iron wire or the cable core; The net frame structure in the present invention is fixed by a fixing part, the fixing part has a simple structure, can be mass-produced, and has a reasonable structural design. Based on the combination of the net frame structure and the fixing part, a relatively fixed net frame structure is formed, which is convenient for installing the cable core and has high installation efficiency. The cable core is horizontally distributed and will not have the problem of twisting. The connecting rod in the present invention is elastic, and when multiple cable cores inside the cable sheath are twisted, the elasticity of the connecting rod can be utilized to reset them in time, thereby avoiding the situation where multiple cable cores are twisted with each other; The present invention also provides an insulating tape and a first grounding component on the cable sheath, and the first grounding component can ground the iron wire inside the cable sheath to avoid static electricity. The first grounding component in the present invention can be applied not only to the bending-resistant high-voltage cable, but also to other cables, has a wide range of applications, and is convenient for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the bending-resistant high-voltage cable of the present invention.

[0018] Figure 2 It is a schematic diagram of the end face structure of the bending-resistant high-voltage cable of the present invention.

[0019] Figure 3 It is a cross-sectional view of the three-dimensional structure of the bending-resistant high-voltage cable of the present invention.

[0020] Figure 4 It is a cross-sectional view of the planar structure of the bending-resistant high-voltage cable of the present invention.

[0021] Figure 5 It is a schematic diagram of the structure of the iron wire and the fixing member of the present invention when used in combination.

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the fixing member of the present invention.

[0023] Figure 7 It is a schematic diagram of the planar structure of the fixing member of the present invention.

[0024] Figure 8 It is a schematic diagram of the bending-resistant high-voltage cable end structure of the present invention.

[0025] Fig. 9 For the present invention Figure 8 An enlarged schematic diagram of the end structure of a high-voltage cable with medium bending resistance.

[0026] Fig.10 For the present invention Fig. 9 A schematic diagram of the enlarged structure in the middle.

[0027] In the figure: 1. cable sheath; 2. cable core; 3. iron wire; 4. fixing piece; 41. first clamp ring; 42. second clamp ring; 401. inlet and outlet; 5. connecting rod; 6. talcum powder; 7. insulating tape; 8. first grounding component; 801. connecting sleeve; 802. transfer and fixed conductive block; 803. first conductive end; 804. internal thread; 805. spring; 806. second conductive end; 807. telescopic groove; 808. telescopic conductive block; 809. elastic skirt; 9. second grounding component; 91. insulating layer; 92. conductive core; 901. connecting groove; 902. external thread. DETAILED DESCRIPTION

[0028] The present invention provides Figure 1-Figure 10 A bending-resistant high-voltage cable is shown.

[0029] Reference Figure 1 As shown in , the bending-resistant high-voltage cable comprises a cable sheath 1 and a cable core 2; The cable sheath 1 is an insulating sheath formed by external extrusion of a conventional high-voltage cable, and can be generally made of materials such as polyethylene, polyvinyl chloride or polypropylene.

[0030] The cable core 2 is a cable inner core with an insulating outer sheath and twisted by a twisting machine. Usually, several of them are provided according to actual needs. In the present invention, three are provided.

[0031] Reference Figure 2 As shown in the figure, an extra blank area is formed between the three cable cores 2 and the inside of the cable sheath 1. In the prior art, talcum powder, rope, PP rope, polyester tape, tin foil tape, aramid yarn, glass fiber yarn and cotton thread and other materials are usually filled to play different roles; such as the tin foil tape filled with metal aluminum foil as the base material, which is bonded with polyester tape after backing with adhesive, and is used for interference shielding of multi-conductor control wires; but although the tin foil tape filled can play a certain role in anti-interference shielding, the tin foil tape is relatively soft and is easily damaged when the cable is bent. Therefore, the present invention proposes a bending-resistant high-voltage cable, which achieves the purpose of taking into account both anti-interference shielding and bending resistance by finding an alternative material: iron wire 3.

[0032] Specifically, refer to Figure 3 to Figure 4 As shown in the figure, taking the case where three cable cores 2 are arranged inside the cable sheath 1 as an example, there are a total of ten iron wires 3 inside the cable sheath 1, one of which is distributed in the central area between the three cable cores 2, and the other nine iron wires 3 are distributed in groups of three in the outer ring clamping grooves formed by the three cable cores 2, and the remaining space inside the cable sheath 1 is filled with talcum powder 6; when the bending-resistant high-voltage cable is bent, the ten iron wires 3 jointly support the cable, making it difficult for the bending-resistant high-voltage cable to be excessively bent, and the bending resistance is strong, and the talcum powder 6 also reduces the wear caused by the contact between the cable sheath 1, the cable core 2 and the iron wires 3 when being bent, thereby increasing the service life of the bending-resistant high-voltage cable.

[0033] At the same time, the ten iron wires 3 form a mesh frame structure surrounding the three cable cores 2, which can achieve the effect of anti-interference shielding.

[0034] refer to Figure 5 As shown in Figure 5 3 is a schematic diagram of the three-dimensional structure of ten iron wires 3; the ten iron wires 3 are fixed using fixing members 4 to ensure that the ten iron wires 3 can maintain the mesh frame structure and be protected outside the cable core 2.

[0035] It should be noted that the fixing member 4 is glued to the outer ring of the cable core 2 by glue so as not to deviate or fall off.

[0036] Reference Figure 6 and attached Figure 7 As shown in the figure, the fixing part 4 includes a first clamping ring 41 and nine second clamping rings 42, three of the nine second clamping rings 42 form a group, and the three second clamping rings 42 are fixedly connected by a connecting rod 5 to form a V-shaped structure. The three groups of V-shaped structures are distributed in an annular array at the outer ring of the first clamping ring 41, and the tip of the V-shaped structure faces the outer ring of the first clamping ring 41, and the tip of the V-shaped structure is also fixedly connected to the outer ring of the first clamping ring 41 by a connecting rod 5. An S area for the cable core 2 to engage can be formed between adjacent V-shaped structures; and a D area for talcum powder 6 to be filled can be formed at the opening of the V-shaped structure; the structural design is reasonable, the fixing part 4 is relatively small in structure, and can be mass-produced.

[0037] The first clamp ring 41 and the second clamp ring 42 are both provided with an inlet and outlet 401 . The first clamp ring 41 and the second clamp ring 42 are both elastically deformable. The iron wire 3 can be engaged into the first clamp ring 41 or the second clamp ring 42 through the inlet and outlet 401 to fix the iron wire 3 .

[0038] The specific production steps of the bending-resistant high-voltage cable of the present invention include: Step 1: Apply glue, immerse the fixing member 4 in glue or apply glue on the outer surface of the fixing member 4; Step 2: construct a mesh frame structure, first clamp one iron wire 3 in the first clamp ring 41 through the inlet and outlet 401 on the first clamp ring 41, then arrange the fixing parts 4 at equal distances along the length direction of the iron wire 3, and clamp this iron wire 3 and multiple first clamp rings 41 at the same time, and then clamp the remaining nine iron wires 3 in nine second clamp rings 42 in turn to form a mesh frame structure; Since the fixing member 4 is coated with glue, after forming the mesh frame structure, the iron wire 3 can be fixed on the fixing member 4; Step 3: Install the cable core 2, insert the three cable cores 2 into the three S areas respectively, and the three cable cores 2 are glued to the fixing member 4 by glue; Step 4: using an extruder, fill talcum powder 6 into the outer ring of the cable core 2, and wrap the cable sheath 1 around the outer ring of the cable core 2, thereby completing the preparation of the bending-resistant high-voltage cable.

[0039] In the present invention, the connecting rod 5 is elastic. When the multiple cable cores 2 inside the cable sheath 1 are twisted, the elasticity of the connecting rod 5 can be utilized to timely reset them, thereby avoiding the multiple cable cores 2 from twisting with each other; and based on the arrangement of the iron wire 3 and the fixing part 4, the cable cores 2 inside the cable sheath 1 can be kept horizontally distributed along the length direction of the cable sheath 1, thereby further avoiding the problems of twisting and wear.

[0040] refer to Figure 8 As shown in , considering that static electricity is prone to occur on the cable surface during actual use, static electricity is usually caused by the following reasons: First: friction generates electric charge. During the use and transportation of cables, due to friction with the outside world, the electric charge is activated and generates static electricity. Once the friction disappears, the charge on the surface of the conductor cannot be neutralized, resulting in the accumulation of static electricity.

[0041] Second: Temperature changes. During the transportation and storage of cables, temperature changes will cause the internal material of the cable to expand, contract and move, thereby generating static electricity on the surface of the conductor.

[0042] Third: Humidity changes: When the weather changes, the temperature drops or the humidity increases, water and water film are likely to accumulate on the surface of the wire, thus generating static electricity.

[0043] Among them, the first and second reasons usually cause static electricity problems inside the cable; the third reason generally causes static electricity problems outside the cable.

[0044] Antistatic materials are generally used in the prior art to reduce the generation and accumulation of electric charges, but the effect is not great. Once there is a static electricity problem, it will lead to problems such as damage to equipment and cables, fire hazards, electromagnetic interference and performance degradation. Therefore, the present invention also provides an insulating tape 7 and a first grounding component 8 on the cable sheath 1. The first grounding component 8 can ground the iron wire 3 inside the cable sheath 1 to avoid static electricity.

[0045] The insulating tape 7 is used to fix the first grounding component 8 on the cable sheath 1 and to seal the connection between the first grounding component 8 and the cable sheath 1 to avoid problems such as water leakage and electric leakage.

[0046] refer to Fig.10As shown in, the first grounding component 8 includes a connecting sleeve 801, which is a cylindrical structure. A telescopic conductive block 808 is slidably provided on the inner upper end of the connecting sleeve 801, and a transfer fixed conductive block 802 is fixedly provided on the inner lower end of the connecting sleeve 801. The second conductive end 806 and the first conductive end 803 are fixedly provided on the upper and lower surfaces of the transfer fixed conductive block 802, respectively. A spring 805 is also fixedly provided on the upper surface of the transfer fixed conductive block 802. The spring 805 is sleeved on the outside of the second conductive end 806, and the upper end of the spring 805 is fixed to the bottom of the telescopic conductive block 808. A telescopic groove 807 is provided on the lower surface of the telescopic conductive block 808, and the upper end of the second conductive end 806 is movably extended into the telescopic groove 807. The inner wall of the lower end of the connecting sleeve 801 is provided with an internal thread 804, and an elastic skirt 809 is fixedly provided at the outer ring of the upper end of the connecting sleeve 801. The elastic skirt 809 is elastic.

[0047] When installing the first grounding component 8, first open a hole on the side of the cable sheath 1, insert one end of the connecting sleeve 801 with the elastic skirt 809 into the hole, and then use the insulating tape 7 to fix the connecting sleeve 801 on the cable sheath 1 and seal the hole; the spring 805 can push the telescopic conductive block 808 to contact the outer surface of the iron wire 3, and after the static electricity is generated inside the cable sheath 1, it can be discharged in sequence along the telescopic conductive block 808, the second conductive end 806, the transfer fixed conductive block 802 and the first conductive end 803, without any static electricity influence.

[0048] Furthermore, based on the setting of the spring 805, the telescopic conductive block 808 can be closely attached to the outer surface of the iron wire 3 in real time, and the problem of poor contact and failure to discharge static electricity due to other factors will not occur.

[0049] Furthermore, based on the setting of the elastic skirt 809, when the connecting sleeve 801 extends into the cable sheath 1, the elastic skirt 809 can be elastically reset to seal the opening on the cable sheath 1, and the elastic skirt 809 will also block the inner wall of the opening to prevent the connecting sleeve 801 from detaching outward, which is highly practical.

[0050] It should be noted that, in actual use, multiple groups of the first grounding components 8 can be provided according to actual needs, and the first grounding components 8 can be installed at a suitable position on the cable sheath 1; the first grounding component 8 in the present invention can be used not only in the bending-resistant high-voltage cable, but also in other cables, with a wide range of applications and convenient for mass production.

[0051] refer to Figure 8 and Fig. 9As shown in the figure, in the present invention, a second grounding component 9 is arranged at one end of the first grounding component 8 away from the cable sheath 1, and the second grounding component 9 includes an insulating layer 91, a conductive core 92 is arranged inside the insulating layer 91, and an electrical connection groove 901 is arranged on the end face of the conductive core 92, and an external thread 902 is arranged at the outer ring of the conductive core 92. When the second grounding component 9 is connected to the first grounding component 8, the external thread 902 is matched with the internal thread 804 for connection, and the first conductive end 803 is engaged into the electrical connection groove 901, and the end of the second grounding component 9 away from the first grounding component 8 is grounded. Through the arrangement of the first grounding component 8 and the second grounding component 9, the static electricity generated inside the cable sheath 1 can be discharged by grounding.

Claims

1. A bending-resistant high-voltage cable, comprising a cable sheath (1) and a cable core (2), wherein a plurality of the cable cores (2) are provided, and characterized in that: Iron wires (3) and fixings (4) are arranged inside the cable sheath (1); a plurality of iron wires (3) are arranged; the fixings (4) are used to fix the plurality of iron wires (3) together to form a mesh frame structure; a plurality of cable cores (2) are fixed by means of the mesh frame structure and the cable cores (2) are distributed in parallel along the length direction of the cable sheath (1).

2. A bending-resistant high-voltage cable according to claim 1, characterized in that: The fixing member (4) is coated with glue, and the fixing member (4) is bonded and fixed to the outer surface of the cable core (2) and the inner surface of the cable sheath (1).

3. A bending-resistant high-voltage cable according to claim 1, characterized in that: The fixing member (4) comprises a first clamping ring (41) and a second clamping ring (42); the first clamping ring (41) is distributed in a middle region between a plurality of cable cores (2); the second clamping ring (42) is distributed at an outer ring of the cable core (2); one first clamping ring (41) is provided, and a plurality of second clamping rings (42) are provided; the first clamping ring (41) and the second clamping ring (42) as well as adjacent second clamping rings (42) are connected via a connecting rod (5).

4. A bending-resistant high-voltage cable according to claim 3, characterized in that: The connecting rod (5) is elastic.

5. The bending-resistant high-voltage cable according to claim 1, characterized in that: A first grounding component (8) is installed on the cable sheath (1), and the first grounding component (8) is fixed to the cable sheath (1) by means of an insulating tape (7); The first grounding component (8) comprises a connecting sleeve (801), the connecting sleeve (801) being a cylindrical structure, a telescopic conductive block (808) being slidably arranged at the internal upper end of the connecting sleeve (801), a transfer fixed conductive block (802) being fixedly arranged at the internal lower end of the connecting sleeve (801), a second conductive end (806) and a first conductive end (803) being fixedly arranged on the upper and lower surfaces of the transfer fixed conductive block (802), a spring (805) being fixedly arranged on the upper surface of the transfer fixed conductive block (802), the spring (805) being sleeved on the outside of the second conductive end (806), the upper end of the spring (805) being fixed to the bottom of the telescopic conductive block (808), a telescopic groove (807) being arranged on the lower surface of the telescopic conductive block (808), the upper end of the second conductive end (806) being movably extended into the telescopic groove (807), and an internal thread (804) being arranged on the inner wall of the lower end of the connecting sleeve (801).

6. A bending-resistant high-voltage cable according to claim 5, characterized in that: An elastic skirt (809) is fixedly provided at the outer ring of the upper end of the connecting sleeve (801), and the elastic skirt (809) is elastic.

7. A bending-resistant high-voltage cable according to claim 5, characterized in that: The first grounding component (8) is used in conjunction with the second grounding component (9); The second grounding component (9) comprises an insulating layer (91), a conductive core (92) is arranged inside the insulating layer (91), an electrical connection groove (901) is arranged on the end surface of the conductive core (92), and an external thread (902) is arranged at the outer ring of the conductive core (92).

8. A bending-resistant high-voltage cable according to claim 7, characterized in that: The external thread (902) and the internal thread (804) cooperate with each other, and the electrical connection slot (901) and the first conductive end (803) cooperate with each other.

9. The bending-resistant high-voltage cable according to claim 1, characterized in that: The interior of the cable sheath (1) is filled with talcum powder (6).

10. The bending-resistant high-voltage cable according to claim 1, characterized in that: The fixing members (4) are provided in multiple groups, and the multiple groups of fixing members (4) are distributed at equal distances along the length direction of the iron wire (3).

Images