Environment-friendly medium-voltage cable suitable for low-temperature environment

Abstract

The invention discloses an environment-friendly medium-voltage cable suitable for a low-temperature environment, and relates to the technical field of cables, the environment-friendly medium-voltage cable comprises a conductor, a shielding tape is wound on the outer side of the conductor, an insulating sleeve sleeves the outer side of the shielding tape, a high-toughness, anti-freezing and anti-cracking mechanism is arranged on the outer side of the insulating sleeve, and the high-toughness, anti-freezing and anti-cracking mechanism comprises a halogen-free flame-retardant sleeve. The cable is scientific and reasonable in structure and safe and convenient to use, a high-toughness, anti-freezing and anti-cracking mechanism is arranged, the halogen-free flame-retardant sleeve, the heat insulation lining and the fireproof layer are matched to form a triple fireproof heat insulation belt, the fireproof effect of the cable is improved, and the cable has the advantages of being high in flame retardance, good in flame retardance, good in heat insulation performance, good in heat insulation performance and the like. Meanwhile, heat dissipation is slowed down, heat generated in the cable is evenly diffused through cooperation of the heat dissipation silica gel ring, the flexible heat conduction silica gel strip and the heat dissipation fins, the interior of the cable is heated, and the temperature in the cable is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to an environmentally friendly medium-voltage cable suitable for low-temperature environments. Background Art

[0002] Cables are wire products used to transmit electrical energy, information, and realize electromagnetic energy conversion. In a broad sense, wires and cables are also referred to as cables. In a narrow sense, cables refer to insulated cables. For example, an environmentally friendly medium-voltage power cable is currently disclosed, with application number CN202222025393.4. This patent solves the problem that existing cables are not easy to dissipate heat when the cable core is heated, which leads to cable damage.

[0003] However, the medium voltage cable has poor cold and frost resistance. In low temperature environments, it is prone to cracking and freezing, which reduces the transmission of electricity. In addition, when the two cables are connected, the sealing effect is insufficient and intermittent connection is prone to occur, which destroys the overall insulation effect of the cable and makes the conductor affected by the external environment. Therefore, in order to avoid the above technical problems, we need to provide an environmentally friendly medium voltage cable suitable for low temperature environments to overcome the above defects in the prior art. Summary of the Invention

[0004] The present invention provides an environmentally friendly medium-voltage cable suitable for low-temperature environments, which can effectively solve the problems raised in the above-mentioned background technology, such as poor cold and frost resistance, easy cracking and freezing in low-temperature environments, which reduces the transmission of electricity. In addition, when the two cables are connected, the sealing effect is insufficient and intermittent connection is likely to occur, which destroys the overall thermal insulation effect of the cable and makes the conductor affected by the external environment.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: an environmentally friendly medium-voltage cable suitable for low-temperature environments, comprising a conductor, a shielding tape wound around the outside of the conductor, an insulating sleeve sleeved on the outside of the shielding tape, a high-toughness and anti-freeze and cracking mechanism provided on the outside of the insulating sleeve, the high-toughness and anti-freeze and cracking mechanism comprising a halogen-free flame-retardant sleeve;

[0006] The outer side of the insulating sleeve is sleeved with a halogen-free flame-retardant sleeve, and the outer side of the halogen-free flame-retardant sleeve is equidistantly clamped with reinforcing ribs;

[0007] The outer side of the insulating sleeve is equidistantly sleeved with heat dissipation silicone rings, and flexible heat-conducting silicone strips are equidistantly clamped between each two adjacent heat dissipation silicone rings, and heat dissipation fins are equidistantly clamped on the outer side of the heat dissipation silicone rings;

[0008] The outer side of the halogen-free flame retardant sleeve is sleeved with a heat-insulating sleeve, and the inner wall of the heat-insulating sleeve is equidistantly clamped with arc-shaped elastic strips;

[0009] A fireproof layer is sleeved on the outer side of the heat-insulating bushing, positioning support rings are clamped at equal distances on the outer side of the fireproof layer, and an elastic spiral rubber ring is clamped between two adjacent positioning support rings.

[0010] According to the above technical solution, the halogen-free flame retardant sleeve is made of ceramic low-smoke halogen-free fire-resistant polyolefin, bending grooves are equidistantly opened on the outside of the reinforcing ribs, and one end of the heat dissipation fin passes through one end of the halogen-free flame retardant sleeve.

[0011] According to the above technical solution, the interior of the thermal insulation bushing is filled with polystyrene foam, and the outer side of the arc-shaped elastic strip fits with the inner wall of the reinforcing rib.

[0012] According to the above technical solution, the outer side of the elastic spiral rubber ring is in contact with the inner wall of the fireproof layer, and the interior of the fireproof layer is filled with polyurethane foam.

[0013] According to the above technical solution, a reinforced alloy wire mesh is fixedly sleeved on the outside of the positioning support ring, a cold-resistant alloy armor is sleeved on the outside of the reinforced alloy wire mesh, an insulation layer is sleeved on the outside of the cold-resistant alloy armor, and an antifreeze rubber sleeve is sleeved on the outside of the insulation layer.

[0014] According to the above technical solution, the interior of the insulation layer is filled with polyurethane foam and aluminum silicate wool, the inner wall of the insulation layer is in contact with the outer side of the cold-resistant alloy armor, and the outer side of the antifreeze rubber sleeve is coated with an antifreeze coating.

[0015] According to the above technical solution, a joint alignment and fitting insulation mechanism is provided between two adjacent antifreeze rubber sleeves, and the joint alignment and fitting insulation mechanism includes an alignment sleeve;

[0016] The adjacent ends of the outer sides of the two antifreeze rubber sleeves are sleeved with alignment sleeves, the outer sides of the two alignment sleeves are sleeved with spacing adjustment rings through threads, the adjacent ends of the two spacing adjustment rings are clamped with corrugated bending tubes, and a docking fixing sleeve is clamped between the two corrugated bending tubes;

[0017] The opposite ends of the two alignment sleeves are rotatably connected to internal threaded cylinders, and external threaded collars are equidistantly sleeved on the outside of the antifreeze rubber sleeves;

[0018] The inner walls of the two alignment sleeves are both clamped with fitting rings, and one end of the fitting ring is clamped with a heat-insulating sealing ring pad at a position corresponding to the inner portion of the docking fixed sleeve;

[0019] The outer side of the docking fixed sleeve is symmetrically connected to a clamping and pushing cylinder, the inside of the clamping and pushing cylinder is connected to a clamping push rod through a thread, the other end of the clamping push rod is clamped with an arc-shaped clamping ring, and both ends of the arc-shaped clamping ring are clamped with anti-deflection slides;

[0020] An inner frame is clamped inside the docking fixing sleeve, and the inner frame is filled with a heat-insulating foam board.

[0021] According to the above technical solution, the inner wall of the internally threaded barrel is connected to the externally threaded collar via threads, the inner diameter of the fitting ring is larger than the outer diameter of the conductor, and the interior of the thermal insulation sealing ring gasket is filled with expanded perlite.

[0022] According to the above technical solution, a knob is fixedly sleeved on the outside of the clamping and pushing cylinder at a position corresponding to the outside of the docking fixed sleeve, and the arc-shaped clamping ring is made of insulating rubber, and the curvature of the arc-shaped clamping ring is equal to the curvature of the conductor.

[0023] According to the above technical solution, one end of the anti-deflection slide plate is slidably connected to one end of the inner frame, and the interior of the thermal insulation foam board is filled with polyurethane foam.

[0024] Compared with the prior art, the present invention has the following beneficial effects: the present invention has a scientific and reasonable structure and is safe and convenient to use:

[0025] 1. It is equipped with a high toughness and anti-freeze and anti-crack mechanism. The halogen-free flame retardant sleeve, thermal insulation sleeve and fireproof layer are combined to form a triple fireproof and insulating belt, which improves the fireproof effect of the cable and slows down the heat dissipation to ensure the temperature inside the cable. The heat generated during the power transmission process is evenly diffused by the heat dissipation silicone ring, flexible thermal conductive silicone strip and heat dissipation fins to prevent the occurrence of local over-temperature inside the cable. At the same time, the heat dissipation is used to heat the inside of the cable to ensure the temperature inside the cable, prevent the occurrence of freezing and cracking, and increase the use effect of the cable in low temperature environment.

[0026] The coordination of the reinforcing ribs, arc-shaped elastic strips, positioning support rings and elastic spiral rubber rings increases the toughness of the cable, making it easier to bend the cable while allowing the cable to quickly reset, preventing deformation, breakage and cracking. At the same time, the heat dissipated can heat the reinforcing ribs, arc-shaped elastic strips, positioning support rings and elastic spiral rubber rings to prevent them from freezing, thus ensuring flexibility and facilitating bending.

[0027] The outer layer of the cable is reinforced by strengthening the alloy wire mesh and cold-resistant alloy armor to improve the compressive strength of the cable. Then, combined with the insulation layer and antifreeze rubber sleeve, the antifreeze and cold resistance of the cable are enhanced, and it can block the influence of external temperature on the inside of the cable, prevent the cable from freezing and cracking, and freeze hardening, so that the cable can still maintain flexibility and transmission efficiency in low temperature environment.

[0028] 2. A joint alignment and fitting insulation mechanism is set up. Through the coordination of the alignment sleeve, internal threaded barrel, external threaded collar, spacing adjustment ring, corrugated bending tube and docking fixing sleeve, the two cables to be connected can be aligned and spliced ​​together, which improves the convenience of docking. Through the coordination of the clamping and pushing barrel, clamping mandrel and arc-shaped clamping ring, the connected conductors are clamped and fixed, which improves the stability of the wiring and prevents loosening. At the same time, the corrugated bending tube is used to facilitate bending the connection of the two cables, which increases adaptability.

[0029] And by rotating the spacing adjustment ring, the distance between the two alignment sleeves is adjusted, which facilitates the docking of two cables with different spacings and improves adaptability. At the same time, during the movement of the alignment sleeve, the fitting ring and the thermal insulation sealing ring pad are moved with it, so that they fit tightly with one end of the cable to prevent gaps. Then, in conjunction with the inner frame and the thermal insulation foam board, the thermal insulation performance of the docking fixing sleeve is improved, preventing the external temperature from affecting the internal conductor, so that the two docked cables can maintain their performance even in a low temperature environment.

[0030] In summary, the high toughness and anti-freeze and anti-cracking mechanisms increase the toughness and cold resistance of the cable, so that the cable can maintain the power transmission effect in a low temperature environment, while preventing the phenomenon of freezing and hardening, ensuring the bending effect, and then through the cooperation of the joint alignment and fitting insulation mechanism, the cable can still reduce the impact of the external temperature on the internal conductor when splicing in a low temperature environment, thereby improving the overall insulation effect of the cable, ensuring the conductor's power transmission effect, and being able to meet the cable's bending effect, and the high toughness and anti-freeze and anti-cracking mechanisms and the joint alignment and fitting insulation mechanism are all environmentally friendly materials, reducing pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0032] In the attached figure:

[0033] Figure 1 It is a structural schematic diagram of the present invention;

[0034] Figure 2 This is a schematic structural diagram of the high toughness and antifreeze and anti-cracking mechanism of the present invention;

[0035] Figure 3 This invention Figure 2 Schematic diagram of the structure of area A;

[0036] Figure 4 This is a schematic diagram of the installation structure of the heat dissipation silicone ring of the present invention;

[0037] Figure 5 This is a schematic diagram of the installation structure of the flexible thermally conductive silicone strip of the present invention;

[0038] Figure 6 It is a schematic diagram of the installation structure of the thermal insulation layer of the present invention;

[0039] Figure 7 This is a schematic diagram of the installation structure of the elastic spiral rubber ring of the present invention;

[0040] Figure 8 It is a structural schematic diagram of the joint alignment and fitting insulation mechanism of the present invention;

[0041] Figure 9 It is a schematic diagram of the installation structure of the thermal insulation foam board of the present invention.

[0042] Numbers in the figure: 1, conductor; 2, shielding tape; 3, insulating sleeve;

[0043] 4. High toughness and anti-freeze and anti-crack mechanism; 401. Halogen-free flame-retardant sleeve; 402. Reinforcement ribs; 403. Heat dissipation silicone ring; 404. Flexible thermal conductive silicone strip; 405. Heat dissipation fins; 406. Thermal insulation bushing; 407. Curved elastic strip; 408. Fireproof layer; 409. Positioning support ring; 410. Elastic spiral rubber ring; 411. Reinforced alloy wire mesh; 412. Cold-resistant alloy armor; 413. Insulation layer; 414. Antifreeze rubber sleeve;

[0044] 5. Joint alignment and fitting insulation mechanism; 501. Alignment sleeve; 502. Spacing adjustment ring; 503. Corrugated bending tube; 504. Docking fixing sleeve; 505. Internally threaded cylinder; 506. Externally threaded collar; 507. Fitting ring; 508. Insulation sealing ring pad; 509. Clamping and pushing cylinder; 510. Clamping push rod; 511. Arc-shaped clamping ring; 512. Anti-deflection slide plate; 513. Inner frame; 514. Insulation foam board. DETAILED DESCRIPTION

[0045] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0046] Example: Figure 1-9 As shown, the present invention provides a technical solution, an environmentally friendly medium-voltage cable suitable for low-temperature environments, comprising a conductor 1, a shielding tape 2 wound around the outside of the conductor 1, an insulating sleeve 3 sleeved on the outside of the shielding tape 2, a high-toughness and anti-freeze and anti-cracking mechanism 4 provided on the outside of the insulating sleeve 3, and the high-toughness and anti-freeze and anti-cracking mechanism 4 including a halogen-free flame-retardant sleeve 401;

[0047] The outer side of the insulating sleeve 3 is sleeved with a halogen-free flame-retardant sleeve 401, and the outer side of the halogen-free flame-retardant sleeve 401 is equidistantly clamped with reinforcing ribs 402;

[0048] Heat dissipation silicone rings 403 are equidistantly connected to the outside of the insulating sleeve 3, and flexible thermally conductive silicone strips 404 are equidistantly clamped between each two adjacent heat dissipation silicone rings 403. Heat dissipation fins 405 are equidistantly clamped to the outside of the heat dissipation silicone rings 403. To facilitate heat transfer, the halogen-free flame-retardant sleeve 401 is made of ceramic low-smoke halogen-free fire-resistant polyolefin. Bending grooves are equidistantly opened on the outside of the reinforcing ribs 402. One end of the heat dissipation fin 405 passes through one end of the halogen-free flame-retardant sleeve 401.

[0049] The outer side of the halogen-free flame-retardant sleeve 401 is sleeved with a heat-insulating sleeve 406, and the inner wall of the heat-insulating sleeve 406 is equidistantly connected with arc-shaped elastic strips 407. In order to improve the heat preservation effect, the interior of the heat-insulating sleeve 406 is filled with polystyrene foam. The outer side of the arc-shaped elastic strip 407 is in contact with the inner wall of the reinforcing rib 402.

[0050] A fireproof layer 408 is sleeved on the outside of the thermal insulation sleeve 406. Positioning support rings 409 are equidistantly clamped on the outside of the fireproof layer 408. An elastic spiral rubber ring 410 is clamped between two adjacent positioning support rings 409. To increase the toughness and resilience of the cable, the outer side of the elastic spiral rubber ring 410 is in contact with the inner wall of the fireproof layer 408. The interior of the fireproof layer 408 is filled with polyurethane foam.

[0051] A reinforced alloy wire mesh 411 is fixedly sleeved on the outside of the positioning support ring 409, and a cold-resistant alloy armor 412 is sleeved on the outside of the reinforced alloy wire mesh 411. A thermal insulation layer 413 is sleeved on the outside of the cold-resistant alloy armor 412, and an antifreeze rubber sleeve 414 is sleeved on the outside of the thermal insulation layer 413. In order to improve the antifreeze and heat preservation performance of the cable, the interior of the thermal insulation layer 413 is filled with polyurethane foam and aluminum silicate wool. The inner wall of the thermal insulation layer 413 is in contact with the outer side of the cold-resistant alloy armor 412, and the outer side of the antifreeze rubber sleeve 414 is coated with an antifreeze coating.

[0052] A joint alignment and fitting insulation mechanism 5 is provided between two adjacent antifreeze rubber sleeves 414, and the joint alignment and fitting insulation mechanism 5 includes an alignment sleeve 501;

[0053] An alignment sleeve 501 is sleeved on the adjacent ends of the two antifreeze rubber sleeves 414. A spacing adjustment ring 502 is sleeved on the outside of the two alignment sleeves 501 through a thread. A corrugated bending tube 503 is clamped on the adjacent ends of the two spacing adjustment rings 502. A docking fixing sleeve 504 is clamped between the two corrugated bending tubes 503.

[0054] The opposite ends of the two alignment sleeves 501 are rotatably connected to the internal threaded cylinder 505, and the outer side of the antifreeze rubber sleeve 414 is equidistantly sleeved with an external threaded collar 506;

[0055] The inner walls of the two alignment sleeves 501 are both clamped with a fitting ring 507, and one end of the fitting ring 507 is clamped with a thermal insulation sealing ring gasket 508 at a position corresponding to the inner part of the docking fixed sleeve 504. To improve the sealing performance at the connection position, the inner wall of the internal threaded barrel 505 is connected to the external threaded collar 506 through a thread. The inner diameter of the fitting ring 507 is larger than the outer diameter of the conductor 1, and the interior of the thermal insulation sealing ring gasket 508 is filled with expanded perlite.

[0056] The outside of the docking fixed sleeve 504 is symmetrically connected to a clamping and pushing cylinder 509, and a clamping push rod 510 is connected to the inside of the clamping and pushing cylinder 509 through a thread. The other end of the clamping push rod 510 is clamped with an arc-shaped clamping ring 511, and both ends of the arc-shaped clamping ring 511 are clamped with anti-deflection slides 512. In order to facilitate the fixation of the connected conductor 1, a knob is fixedly sleeved at the position on the outside of the clamping and pushing cylinder 509 corresponding to the outside of the docking fixed sleeve 504. The arc-shaped clamping ring 511 is made of insulating rubber, and the curvature of the arc-shaped clamping ring 511 is equal to the curvature of the conductor 1.

[0057] An inner frame 513 is clamped inside the docking fixing sleeve 504, and the inner frame 513 is filled with an insulating foam board 514. In order to limit the arc-shaped clamping ring 511, one end of the anti-deflection slide plate 512 is slidably connected to one end of the inner frame 513, and the insulating foam board 514 is filled with polyurethane foam.

[0058] The working principle and use process of the present invention are as follows: first, the conductor 1 is wound with a shielding tape 2, and then covered with an insulating sleeve 3. At the same time, a layer of halogen-free flame retardant sleeve 401, a layer of thermal insulation sleeve 406 and a layer of fireproof layer 408 are filled on the outside of the insulating sleeve 3 to form a triple fireproof and heat-insulating belt, which improves the fireproof and heat-insulating effect of the cable. The halogen-free flame retardant sleeve 401, the thermal insulation sleeve 406 and the fireproof layer 408 are all made of environmentally friendly materials, which reduces pollution to the environment. In addition, by strengthening the alloy wire mesh 411 and the cold-resistant alloy armor 412, the inside of the cable is reinforced to increase the compressive strength. Then, the thermal insulation layer 413 and the antifreeze rubber sleeve 414 are used to block the external temperature and prevent the temperature inside the cable from being too low, so that the conductor 1 can ensure the transmission effect of electricity and prevent the phenomenon of freezing and hardening, thereby increasing the service life of the cable in a low temperature environment.

[0059] Next, during the power transmission process, the conductor 1 transfers the dissipated heat through the cooperation of the heat dissipation silicone ring 403 and the flexible heat-conducting silicone strip 404, forcing the heat inside the cable to be evenly dispersed, preventing the temperature in a local location from being too high and overheating. At the same time, the heat dissipation fins 405 further evenly disperse the heat, thereby improving the uniformity of the temperature inside the cable and ensuring the flexibility of the reinforcing ribs 402, the arc-shaped elastic strips 407, and the elastic spiral rubber ring 410, thereby preventing the reinforcing ribs 402, the arc-shaped elastic strips 407, and the elastic spiral rubber ring 410 from becoming hard due to low temperature.

[0060] When bending, the reinforcing ribs 402 increase the toughness of the cable. At the same time, because the outer side of the reinforcing ribs 402 is provided with a bending groove, the cable is conveniently bent. In combination with the arc-shaped elastic strip 407, the cable can be quickly reset while being easy to bend, preventing deformation. In addition, the positioning support ring 409 and the elastic spiral rubber ring 410 cooperate to further enhance the toughness of the cable, strengthen the bending rebound effect, and prevent the cable from breaking or cracking.

[0061] When the cables are connected, the internal threaded barrel 505 is rotated to move along the external threaded collar 506, thereby moving the alignment sleeve 501 and sleeved on the outside of an antifreeze rubber sleeve 414, and then the two conductors 1 inside the cable are connected. After the connection is completed, the internal threaded barrel 505 at the other end is connected to the outside of another antifreeze rubber sleeve 414, completing the splicing between the two cables, improving convenience, and rotating the spacing adjustment ring 502 as needed to move along the outside of the alignment sleeve 501, and adjusting the distance between the two alignment sleeves 501 as needed, improving adaptability, and facilitating the splicing and fixing of two cables with different spacings;

[0062] When the two cables are spliced ​​together, the clamping and pushing cylinder 509 is rotated, and the anti-deflection slide 512 is limited, so that the clamping push rod 510 pushes the arc-shaped clamping ring 511 to move inside the docking fixing sleeve 504, adjusting the distance between the two arc-shaped clamping rings 511, thereby clamping and fixing the two connected conductors 1, ensuring the stability of the connection;

[0063] Finally, when the fitting ring 507 and the thermal insulation sealing ring pad 508 are pulled to move, the fitting ring 507 is tightly fitted with one end of the cable, and cooperates with the inner frame 513 and the thermal insulation foam board 514, thereby increasing the sealing and thermal insulation effect of the docking fixing sleeve 504, and preventing the external temperature from affecting the transmission of electricity by the internal conductor 1.

[0064] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An environmentally friendly medium voltage cable suitable for low temperature environments, comprising a conductor (1), characterized in that: A shielding tape (2) is wound around the outside of the conductor (1), an insulating sleeve (3) is sleeved on the outside of the shielding tape (2), a high-toughness and anti-freeze and anti-cracking mechanism (4) is provided on the outside of the insulating sleeve (3), and the high-toughness and anti-freeze and anti-cracking mechanism (4) includes a halogen-free flame-retardant sleeve (401); A halogen-free flame-retardant sleeve (401) is sleeved on the outside of the insulating sleeve (3), and reinforcing ribs (402) are equidistantly clamped on the outside of the halogen-free flame-retardant sleeve (401); Heat dissipation silicone rings (403) are equidistantly sleeved on the outside of the insulating sleeve (3), and flexible heat-conducting silicone strips (404) are equidistantly clamped between each two adjacent heat dissipation silicone rings (403), and heat dissipation fins (405) are equidistantly clamped on the outside of the heat dissipation silicone rings (403); The outer side of the halogen-free flame-retardant sleeve (401) is sleeved with a heat-insulating sleeve (406), and the inner wall of the heat-insulating sleeve (406) is equidistantly clamped with arc-shaped elastic strips (407); The outer side of the heat-insulating bushing (406) is sleeved with a fireproof layer (408), and the outer side of the fireproof layer (408) is equidistantly clamped with positioning support rings (409), and an elastic spiral rubber ring (410) is clamped between two adjacent positioning support rings (409).

2. The environmentally friendly medium voltage cable suitable for low temperature environments according to claim 1, characterized in that: The halogen-free flame retardant sleeve (401) is made of ceramic low-smoke halogen-free fire-resistant polyolefin, and bending grooves are equidistantly provided on the outside of the reinforcing ribs (402). One end of the heat dissipation fin (405) passes through one end of the halogen-free flame retardant sleeve (401).

3. The environmentally friendly medium voltage cable suitable for low temperature environments according to claim 1, characterized in that: The interior of the heat-insulating sleeve (406) is filled with polystyrene foam, and the outer side of the arc-shaped elastic strip (407) is in contact with the inner wall of the reinforcing rib (402).

4. The environmentally friendly medium voltage cable suitable for low temperature environments according to claim 1, characterized in that: The outer side of the elastic spiral rubber ring (410) is in contact with the inner wall of the fireproof layer (408), and the interior of the fireproof layer (408) is filled with polyurethane foam.

5. The environmentally friendly medium voltage cable suitable for low temperature environments according to claim 1, characterized in that: A reinforcing alloy wire mesh (411) is fixedly sleeved on the outside of the positioning support ring (409), a cold-resistant alloy armor (412) is sleeved on the outside of the reinforcing alloy wire mesh (411), a heat-insulating layer (413) is sleeved on the outside of the cold-resistant alloy armor (412), and an antifreeze rubber sleeve (414) is sleeved on the outside of the heat-insulating layer (413).

6. The environmentally friendly medium voltage cable suitable for low temperature environments according to claim 5, characterized in that: The interior of the thermal insulation layer (413) is filled with polyurethane foam and aluminum silicate wool, the inner wall of the thermal insulation layer (413) is in contact with the outer side of the cold-resistant alloy armor (412), and the outer side of the antifreeze rubber sleeve (414) is coated with an antifreeze coating.

7. The environmentally friendly medium voltage cable suitable for low temperature environments according to claim 5, characterized in that: A joint alignment and fitting insulation mechanism (5) is provided between two adjacent antifreeze rubber sleeves (414), and the joint alignment and fitting insulation mechanism (5) includes an alignment sleeve (501); The adjacent ends of the outer sides of the two antifreeze rubber sleeves (414) are sleeved with an alignment sleeve (501), the outer sides of the two alignment sleeves (501) are sleeved with a spacing adjustment ring (502) through a thread, the adjacent ends of the two spacing adjustment rings (502) are clamped with a corrugated bending tube (503), and a docking fixing sleeve (504) is clamped between the two corrugated bending tubes (503); The opposite ends of the two alignment sleeves (501) are both rotatably connected to internal threaded cylinders (505), and the outer side of the antifreeze rubber sleeve (414) is equidistantly sleeved with external threaded collars (506); The inner walls of the two alignment sleeves (501) are both clamped with a fitting ring (507), and one end of the fitting ring (507) is clamped with a heat-insulating sealing ring gasket (508) at a position corresponding to the inner portion of the docking fixed sleeve (504); The outside of the docking fixed sleeve (504) is symmetrically connected to a clamping and pushing cylinder (509), the inside of the clamping and pushing cylinder (509) is connected to a clamping push rod (510) through a thread, the other end of the clamping push rod (510) is clamped with an arc-shaped clamping ring (511), and both ends of the arc-shaped clamping ring (511) are clamped with anti-deflection slide plates (512); An inner frame (513) is clamped inside the docking fixing sleeve (504), and the inner frame (513) is filled with a heat-insulating foam board (514).

8. The environmentally friendly medium voltage cable suitable for low temperature environments according to claim 7, characterized in that: The inner wall of the internal threaded barrel (505) is connected to the external threaded collar (506) via threads. The inner diameter of the fitting ring (507) is larger than the outer diameter of the conductor (1). The interior of the thermal insulation sealing ring gasket (508) is filled with expanded perlite.

9. The environmentally friendly medium voltage cable suitable for low temperature environments according to claim 7, characterized in that: A knob is fixedly sleeved on the outside of the clamping and pushing cylinder (509) at a position corresponding to the outside of the docking fixed sleeve (504); the arc-shaped clamping ring (511) is made of insulating rubber; and the curvature of the arc-shaped clamping ring (511) is equal to the curvature of the conductor (1).

10. The environmentally friendly medium voltage cable suitable for low temperature environments according to claim 7, characterized in that: One end of the anti-deflection slide plate (512) is slidably connected to one end of the inner frame (513), and the interior of the thermal insulation foam plate (514) is filled with polyurethane foam.

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