A tensile, non-breakable high voltage cable

Abstract

The application discloses an anti-tension and anti-breakdown high-voltage cable and relates to the technical field of high-voltage cables.The anti-tension and anti-breakdown high-voltage cable comprises a core body, the outer side of the core body is sequentially sleeved with an inner steel pipe sheath and an outer steel pipe sheath, the opposite outer circumferential walls of the inner steel pipe sheath and the inner circumferential walls of the outer steel pipe sheath are uniformly and spacedly provided with a plurality of groups of first grooves and second grooves, a plurality of the first grooves and a plurality of the second grooves of each group are uniformly and spacedly arranged along the circumferences of the inner steel pipe sheath and the outer steel pipe sheath, and an anti-tension assembly is arranged between each pair of the first grooves and the second grooves; the outer circumference of the outer steel pipe sheath is uniformly and spacedly provided with a plurality of partition protruding rings, and the outer ends of the plurality of partition protruding rings are commonly provided with a rubber protective layer.The anti-tension and anti-breakdown high-voltage cable can bear long-term rated voltage and instantaneous overvoltage to reduce the risk of breakdown, and can realize dynamic buffering and mechanical strength strengthening functions of the high-voltage cable under the action of tension.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage cables, in particular to a tensile and anti-breakdown high-voltage cable. BACKGROUND

[0002] With the rapid development of power transmission and energy industry, high-voltage cables are increasingly widely used in power systems, especially in long-distance power transmission, urban power grids and special environments (such as submarine, mine, high-cold area, etc.). However, the traditional high-voltage cable still faces two key technical problems in actual operation: first, under the action of complex laying environment (such as bridge, tunnel, overhead line) or mechanical external force, the cable is easy to be deformed and damaged due to long-term tensile stress of the cable core conductor, which seriously affects the reliability and service life of power transmission. In addition, under the condition of long-term high electric field, overvoltage or partial discharge, the high-voltage cable is easy to break down, which exists safety hidden trouble, so a tensile and anti-breakdown high-voltage cable is developed. SUMMARY

[0003] The purpose of the present application is to provide a tensile and anti-breakdown high-voltage cable to solve the technical problems mentioned in the background.

[0004] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0005] The present application relates to the technical field of high-voltage cables, in particular to a tensile and anti-breakdown high-voltage cable.

[0006] Further, the core body includes a plurality of conductors arranged uniformly along the circumference, and a mineral insulation layer and a cross-linked polyethylene isolation layer are sequentially arranged on the outer side of the plurality of conductors.

[0007] Further, a plurality of limiting teeth are fixedly arranged on the outer circumferential wall of the cross-linked polyethylene isolation layer along the circumference, and a plurality of limiting tooth grooves matched with the limiting teeth are uniformly arranged on the inner circumferential wall of the inner steel pipe sheath.

[0008] Further, the anti-pulling assembly comprises a first guide rod fixedly arranged in the first groove and a second guide rod fixedly arranged in the second groove, two first sliding sleeves are slidably arranged on the first guide rod, and a first spring is sleeved on the first guide rod between the sidewall of the first groove and the two first sliding sleeves; two second sliding sleeves corresponding to the two first sliding sleeves are slidably arranged on the second guide rod, and a second spring is sleeved on the second guide rod between the sidewall of the second groove and the two second sliding sleeves; a first supporting rod and a second supporting rod are hingedly arranged between the two first sliding sleeves and the two second sliding sleeves, and the first supporting rod and the second supporting rod are arranged in an X-shaped cross.

[0009] Further, each first sliding sleeve is fixedly arranged with a first connecting lug close to one end of the outer steel pipe sheath, each second sliding sleeve is fixedly arranged with a second connecting lug close to one end of the inner steel pipe sheath, and the two ends of the first supporting rod and the two ends of the second supporting rod are hingedly connected with the corresponding first connecting lug and second connecting lug.

[0010] Further, a long strip-shaped through hole part is formed in the middle part of the first supporting rod, and a flat part penetrating through the through hole part is arranged in the middle part of the second supporting rod.

[0011] Further, a plurality of reinforcing ribs are fixedly arranged on the inner circumferential wall of the rubber protection layer in a circumferential direction.

[0012] Further, a plurality of pairs of corrugated expansion plates are fixedly arranged in each gas storage cavity between each reinforcing rib and the outer circumferential wall of the outer steel pipe sheath in a circumferential direction, two corrugated expansion plates of each pair are oppositely arranged, one end of the two corrugated expansion plates is fixedly connected with the corresponding reinforcing rib, and the other end of the two corrugated expansion plates is obliquely arranged away from the corresponding reinforcing rib and fixedly connected with the outer circumferential wall of the outer steel pipe sheath.

[0013] Further, an elastic supporting assembly is arranged between each reinforcing rib and the outer steel pipe sheath between each pair of corrugated expansion plates.

[0014] Further, each elastic supporting assembly comprises a sliding connecting rod fixedly connected with the reinforcing rib and a supporting sleeve fixedly connected with the outer steel pipe sheath, the sliding connecting rod is gap-fitted with a through hole formed in the end of the supporting sleeve, one end of the sliding connecting rod inside the supporting sleeve is fixedly arranged with a sliding seat slidably fitted with the inner circumferential wall of the supporting sleeve, and the inside of the supporting sleeve is provided with a third spring between the sliding seat and the outer steel pipe sheath.

[0015] Compared with the prior art, the beneficial technical effects of the present application are:

[0016] The present application sequentially covers mineral insulation layer and cross-linked polyethylene isolation layer outside multiple conductors of the cable core body: the mineral insulation layer can reduce conductor surface electric field distortion, inhibit corona discharge and insulation aging under high voltage; the cross-linked polyethylene isolation layer can withstand long-term rated voltage and instantaneous overvoltage, reduce the risk of breakdown, and serve as a transition between the mineral insulation layer and the external sliding sleeve, relieve stress concentration caused by the rigidity of the mineral layer, and improve the overall flexibility of the cable.

[0017] The present application realizes dynamic buffering and mechanical strength enhancement of the high-voltage cable under tension by the groove of the inner and outer steel pipe sheath cooperating with the X-shaped tensile resistance assembly: when the tension is transmitted to the inner and outer steel pipe sheath, the X-shaped strut telescopic structure expands, the spring is compressed and part of the tension is offset by elastic deformation, preventing the steel pipe sheath from directly deforming and thus improving the overall tensile resistance of the cable. When the inner and outer steel pipe sheaths are under pressure, the X-shaped strut structure cooperates with the spring to change the extension and retraction, which can also convert local pressure into elastic potential energy, preventing the sheath from deforming and collapsing, thereby improving the protection of the cable core body.

[0018] The partition protruding ring of the present application is uniformly distributed on the outer periphery of the outer steel pipe sheath and connected to the rubber protective layer, and cooperates with inert gas filling to effectively resist external extrusion or collision, reduce the transmission of external impact to the internal structure of the cable, and block the penetration of oxygen and moisture to prevent the oxidation and corrosion of the steel pipe sheath. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described below in conjunction with the drawings.

[0020] Figure 1 The present application is a schematic diagram of the overall structure;

[0021] Figure 2 The present application is a schematic diagram of the cable core body structure;

[0022] Figure 3 The present application is a schematic diagram of the inner steel pipe sheath structure;

[0023] Figure 4 The present application is a schematic diagram of the outer steel pipe sheath structure;

[0024] Figure 5 The present application is a schematic diagram of the tensile resistance assembly structure;

[0025] Figure 6 The present application is a schematic diagram of the rubber protective layer structure;

[0026] Figure 7 The present application is a cross-sectional schematic diagram;

[0027] Figure 8 The present application is a schematic diagram of the elastic support assembly structure;

[0028] Explanation of reference numerals in the attached drawings: 1. Conductor; 2. Mineral insulation layer; 3. Cross-linked polyethylene isolation layer; 4. Inner steel pipe sheath; 5. Outer steel pipe sheath; 6. Limiting tooth; 7. Limiting tooth groove; 8. First groove; 9. Second groove; 10. First guide rod; 11. Second guide rod; 12. First sliding sleeve; 13. First spring; 14. Second sliding sleeve; 15. Second spring; 16. First support rod; 17. Second support rod; 18. First connecting ear; 19. Second connecting ear; 20. Through hole; 21. Flat part; 22. Partition ring; 23. Rubber protective layer; 24. Reinforcing rib; 25. Corrugated telescopic plate; 26. Sliding connecting rod; 27. Support sleeve; 28. Slide seat; 29. ​​Third spring. Detailed Implementation

[0029] like Figures 1-3 As shown, a tensile-resistant and breakdown-resistant high-voltage cable includes a core body, which includes a plurality of conductors 1 evenly arranged circumferentially, and the outer sides of the plurality of conductors 1 are sequentially covered with a mineral insulation layer 2 and a cross-linked polyethylene isolation layer 3. On the outer side of the core body, i.e., the cross-linked polyethylene isolation layer 3, an inner steel tube sheath 4 and an outer steel tube sheath 5 are sequentially fitted. In this embodiment, multiple limiting protrusions 6 are uniformly fixedly arranged circumferentially on the outer peripheral wall of the cross-linked polyethylene isolation layer 3, and multiple limiting grooves 7 are uniformly opened on the inner peripheral wall of the inner steel tube sheath 4, which are adapted to each of the limiting protrusions 6. The present invention sequentially covers the outer side of multiple conductors of the core body with a mineral insulation layer and a cross-linked polyethylene isolation layer: the mineral insulation layer can reduce the electric field distortion on the conductor surface and suppress corona discharge and insulation aging under high voltage; the cross-linked polyethylene isolation layer can withstand long-term rated voltage and instantaneous overvoltage, reduce the risk of breakdown, and serve as a transition between the mineral insulation layer and the outer sliding sleeve, alleviating the stress concentration that may be caused by the rigidity of the mineral layer and improving the overall flexibility of the cable. Through the mutual cooperation of the multiple limiting protrusions 6 and limiting grooves 7, the connection strength between the cable core body and the inner steel tube sheath 4 can be effectively improved.

[0030] like Figures 3-5 As shown, multiple sets of first grooves 8 and second grooves 9 are evenly spaced on the outer peripheral wall of the inner steel pipe sheath 4 and the inner peripheral wall of the outer steel pipe sheath 5, respectively. The multiple sets of first grooves 8 and multiple sets of second grooves 9 are evenly spaced along the circumference of the inner steel pipe sheath 4 and the outer steel pipe sheath 5, respectively. Tensile components are respectively provided between the opposite first grooves 8 and second grooves 9.

[0031] In the embodiment, the anti-tension assembly comprises a first guide rod 10 fixedly arranged in the first groove 8 and a second guide rod 11 fixedly arranged in the second groove 9. Two first sliding sleeves 12 are slidingly arranged on the first guide rod 10, and the first guide rod 10 is sleeved with a first spring 13 at a position between the side wall of the first groove 8 and each of the two first sliding sleeves 12. Two second sliding sleeves 14 corresponding to the two first sliding sleeves 12 are slidingly arranged on the second guide rod 11, and the second guide rod 11 is sleeved with a second spring 15 at a position between the side wall of the second groove 9 and each of the two second sliding sleeves 14.

[0032] A first support rod 16 and a second support rod 17 are hingedly arranged between the two first sliding sleeves 12 and the two second sliding sleeves 14, and the first support rod 16 and the second support rod 17 are arranged in an X-shaped cross. Specifically, each of the first sliding sleeves 12 is fixedly arranged with a first connecting lug 18 near one end of the outer steel pipe sheath 5, each of the second sliding sleeves 14 is fixedly arranged with a second connecting lug 19 near one end of the inner steel pipe sheath 4, and the two ends of the first support rod 16 and the two ends of the second support rod 17 are hingedly connected with the corresponding first connecting lug 18 and second connecting lug 19. In addition, a long hole part 20 is formed in the middle of the first support rod 16, and a flat part 21 is arranged in the middle of the second support rod 17 and penetrates the long hole part 20.

[0033] The application realizes the dynamic buffering and mechanical strength enhancement function of the high-voltage cable under tension by the groove of the inner and outer steel pipe sheaths and the X-shaped anti-tension assembly. First, the first groove of the inner steel pipe sheath and the second groove of the outer steel pipe sheath are uniformly distributed in the circumferential direction to form symmetrical load points, which ensures the uniformity of stress distribution. The first support rod and the second support rod serve as the support shaft of the sliding mechanism. When the cable as a whole is subjected to axial tension, the first sliding sleeve and the second sliding sleeve can slide along the corresponding first support rod and second support rod and cooperate with the first spring and the second spring at both ends to form a two-way elastic buffer. Moreover, the first support rod and the second support rod form an X-shaped cross expandable truss structure by hingedly connecting the corresponding sliding sleeves. The long hole part of the first support rod and the flat part of the second support rod cooperate with each other to allow the cross support rods to slide relative to each other when expanding and contracting, avoiding movement interference. When the tension is transmitted to the inner and outer steel pipe sheaths, the X-shaped support rod expansion structure is expanded, the spring is compressed and offset part of the tension through elastic deformation, preventing the steel pipe sheath from directly deforming and thus improving the tensile performance of the cable as a whole. When the inner and outer steel pipe sheaths are subjected to pressure, the X-shaped support rod structure cooperates with the expansion and contraction of the spring to also convert the local pressure into elastic potential energy, avoiding the deformation and collapse of the sheath and thus improving the protection of the cable core body.

[0034] The outer periphery of the outer steel pipe sheath 5 is uniformly and fixedly provided with partition protrusions 22, and the outer ends of the plurality of partition protrusions 22 are collectively provided with a rubber protection layer 23.

[0035] In addition, in the embodiment, a plurality of reinforcing ribs 24 are uniformly and fixedly arranged on the inner periphery of the rubber protection layer 23 in the circumferential direction. A plurality of pairs of corrugated expansion plates 25 are respectively and uniformly arranged in the circumferential direction in each of the gas storage cavities between the reinforcing rib 24 and the outer periphery of the outer steel pipe sheath 5. Two corrugated expansion plates 25 of each pair are oppositely arranged and one end of the two corrugated expansion plates 25 is fixedly connected to the corresponding reinforcing rib 24. The other end of the two corrugated expansion plates 25 of each pair is arranged in a direction away from the corresponding reinforcing rib 24 and is fixedly connected to the outer periphery of the outer steel pipe sheath 5.

[0036] The reinforcing rib 24 and the outer steel pipe sheath 5 are respectively provided with an elastic support assembly between the two opposite corrugated expansion plates 25. Specifically, the elastic support assembly includes a sliding connecting rod 26 fixedly connected to the reinforcing rib and a support sleeve 27 fixedly connected to the outer steel pipe sheath 5. The sliding connecting rod 26 is in clearance fit with a through hole formed in the end of the support sleeve 27 and one end of the sliding connecting rod 26 inside the support sleeve 27 is fixedly provided with a sliding seat 28 in sliding fit with the inner periphery of the support sleeve 27. The inside of the support sleeve 27 is provided with a third spring 29 at a position between the sliding seat 28 and the outer steel pipe sheath 5.

[0037] The partition protrusions of the present application are uniformly distributed on the outer periphery of the outer steel pipe sheath as a rigid support framework and are connected to the rubber protection layer. In combination with the inert gas filling, the partition protrusions can effectively resist external extrusion or collision, reduce the transmission of external impact to the internal structure of the cable, and block the penetration of oxygen and moisture to prevent the oxidation and corrosion of the steel pipe sheath. In addition, the circumferentially uniformly distributed reinforcing ribs of the rubber protection layer can effectively prevent the collapse or tearing of the rubber layer and uniformly disperse the external load to the corrugated expansion plates and the elastic support assemblies when an external force acts. When the corrugated expansion plates are subjected to pressure, they deform themselves and form a reverse supporting force in combination with the expansion and contraction of the elastic support assemblies to buffer the impact of external load, thereby improving the protection effect on the internal cable.

[0038] The above-described embodiments are only preferred modes of the present application and do not limit the scope of the present application. Various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope defined by the claims of the present application.

Claims

1. A high-voltage cable with tensile strength and resistance to breakdown, characterized in that: The device includes a core body, with an inner steel tube sheath and an outer steel tube sheath sequentially fitted around its outer side. Multiple sets of first and second grooves are evenly spaced on the outer and inner circumferential walls of the inner and outer steel tube sheaths, respectively. The multiple first and second grooves in each set are evenly spaced along the circumference of the inner and outer steel tube sheaths. Tensile-resistant components are respectively disposed between each pair of opposing first and second grooves. Each tensile-resistant component includes a first guide rod fixedly disposed within the first groove and a second guide rod fixedly disposed within the second groove. The first and second guide rods are respectively arranged along the axial direction of the inner and outer steel tube sheaths. Two first sliding sleeves are slidably disposed on the first guide rod, and the first guide rod is located on the side wall of the first groove and between the two first and second grooves. A first spring is fitted between the two sliding sleeves; two second sliding sleeves corresponding to the two first sliding sleeves are slidably arranged on the second guide rod, and a second spring is fitted on the second guide rod between the side wall of the second groove and the two second sliding sleeves; a first support rod and a second support rod are hinged between the two first sliding sleeves and the two second sliding sleeves, and the first support rod and the second support rod are arranged in an X-shape; a long through hole is opened in the middle of the first support rod, and a flat part penetrating the through hole is provided in the middle of the second support rod; partition rings are fixedly arranged at even intervals on the outer periphery of the outer steel pipe sheath, and a rubber protective layer is provided on the outer ends of the multiple partition rings. A gas storage cavity is formed between each pair of adjacent partition rings and the inner peripheral wall of the rubber protective layer, and each gas storage cavity is filled with inert gas.

2. The tensile-resistant and breakdown-resistant high-voltage cable according to claim 1, characterized in that: The core body includes multiple conductors evenly arranged circumferentially, and the outer sides of the multiple conductors are sequentially covered with a mineral insulation layer and a cross-linked polyethylene isolation layer.

3. The tensile-resistant and breakdown-resistant high-voltage cable according to claim 2, characterized in that: Multiple limiting protrusions are uniformly fixedly arranged circumferentially on the outer peripheral wall of the cross-linked polyethylene isolation layer, and multiple limiting tooth grooves are uniformly opened on the inner peripheral wall of the inner steel pipe sheath, each corresponding to one of the limiting protrusions.

4. The tensile-resistant and breakdown-resistant high-voltage cable according to claim 1, characterized in that: Each of the first sliding sleeves has a first connecting lug fixedly provided at one end near the outer steel pipe sheath, and each of the second sliding sleeves has a second connecting lug fixedly provided at one end near the inner steel pipe sheath. The two ends of the first support rod and the two ends of the second support rod are respectively hinged to the corresponding first connecting lug and second connecting lug.

5. The tensile-resistant and breakdown-resistant high-voltage cable according to claim 1, characterized in that: Multiple reinforcing ribs are uniformly fixed along the circumferential direction on the inner peripheral wall of the rubber protective layer.

6. The tensile-resistant and breakdown-resistant high-voltage cable according to claim 5, characterized in that: Multiple pairs of corrugated expansion plates are uniformly fixed in the circumferential direction between each of the reinforcing ribs and the outer peripheral wall of the outer steel pipe sheath in each of the gas storage chambers. The two corrugated expansion plates in each pair are arranged opposite each other and one end of both is fixedly connected to the corresponding reinforcing rib. The other end of the two corrugated expansion plates in each pair is inclined in a direction away from the corresponding reinforcing rib and is fixedly connected to the outer peripheral wall of the outer steel pipe sheath.

7. The tensile-resistant and breakdown-resistant high-voltage cable according to claim 6, characterized in that: Each of the reinforcing ribs and the outer steel pipe sheath is provided with an elastic support assembly between each of the two opposite corrugated expansion plates.

8. The tensile-resistant and breakdown-resistant high-voltage cable according to claim 7, characterized in that: Each of the elastic support components includes a sliding link fixedly connected to the reinforcing rib and a support sleeve fixedly connected to the outer steel tube sheath. The sliding link is clearance-fitted with a through hole opened at the end of the support sleeve, and a slide block is fixedly provided at one end of the sliding link inside the support sleeve, which slides in cooperation with the inner peripheral wall of the support sleeve. A third spring is provided inside the support sleeve at the position between the slide block and the outer steel tube sheath.

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