A low-temperature resistant, crack-resistant protective conduit for communication and power cables

Abstract

This invention relates to the field of power cable technology, specifically to a low-temperature resistant, crack-resistant protective conduit for communication and power cables. It includes a cable body with an inner insulation structure. The insulation structure includes a first positioning ring and a second positioning ring located inside the cable body. The outer wall of the second positioning ring has a heating wire groove, and the inner side of the heating wire groove has a heating wire body. An installation head is fixedly connected to the outer wall of the second positioning ring, and a connecting post is fixedly connected between the installation heads. The side wall of the connecting post has a wire-passing groove. The venting structure includes a venting ring fixedly fitted around the outer ring of the cable body, and multiple venting pipes are fixedly connected to the outer wall of the venting ring. This invention provides a low-temperature resistant, crack-resistant protective conduit for communication and power cables, which has the advantages of heating and insulation in low-temperature environments, automatic venting, and high overall cable stability and compressive strength.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, specifically to a low-temperature resistant, crack-resistant protective conduit for communication and power cables. Background Technology

[0002] Power cables are cables used to transmit and distribute electrical energy. They are commonly used in urban underground power grids, power plant lead-out lines, internal power supply for industrial and mining enterprises, and underwater transmission lines across rivers and seas. Compared with overhead lines, power cables have advantages such as requiring less land, providing reliable power supply, being unaffected by weather and environmental interference, and not affecting the aesthetics of the city. They are an indispensable and important component of modern power systems.

[0003] In the prior art, patent document CN205810427U discloses a pressure-resistant cable. The inner insulation layer is fitted with a pressure-resistant frame, which includes an inner ring and an outer ring. The inner and outer rings are connected by three supports evenly distributed in the circumferential direction, and the three supports divide the circumferential gap between the inner and outer rings into three chambers. Each chamber contains an air cushion, the maximum volume of which is slightly smaller than the volume of the chamber. The pressure-resistant frame has an anti-tear structure around its perimeter, and an outer insulation layer surrounds the anti-tear structure. Compared with the prior art, the advantages of this pressure-resistant cable are: reasonable design, not easily damaged, safe and reliable, and effectively resistant to tearing by small animals such as rats; robust structure, good pressure resistance, effectively withstanding external crushing, ensuring smooth communication; and effective protection of the wire core even in the event of a fire. However, the above-mentioned technical solutions rely on inner and outer layers and a pressure-resistant frame for overall cable pressure resistance, resulting in an overly simplistic structure and insufficient pressure resistance. When the cable is subjected to excessive pressure, the integrated pressure-resistant frame will be subjected to a strong impact force and cannot effectively buffer the impact. This will cause the pressure-resistant frame to directly impact the inner and outer layers of the cable, leading to damage. Furthermore, the cable lacks effective insulation measures. When the cable is subjected to long-term low-temperature interference, its inner and outer layers will freeze and harden, increasing its brittleness and making it highly susceptible to pressure damage. Based on this, the present invention provides a low-temperature brittle-resistant protective conduit for communication and power cables to solve the problems mentioned in the background art. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art by providing a low-temperature brittle-resistant protective conduit for communication and power cables. It has the advantages of heating and heat preservation in low-temperature environments, automatic air venting, and high overall stability and compressive strength of the cables.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a low-temperature resistant and brittle-resistant protective pipe for communication and power cables, comprising a cable body, an insulation structure provided on the inner side of the cable body, the insulation structure comprising a positioning ring one and a positioning ring two located on the inner side of the cable body, a heating wire groove provided on the outer wall of the positioning ring two, a heating wire body provided on the inner side of the heating wire groove, an installation head fixedly connected to the outer wall of the positioning ring two, a connecting post fixedly connected between the installation heads, and a wire groove provided on the side wall of the connecting post; The outer side of the cable body is provided with a venting structure, which includes a venting ring fixedly sleeved on the outer ring of the cable body. Multiple venting pipes are fixedly connected to the outer wall of the venting ring. A rotating seat is fixedly installed on the top of the venting pipe. A rotating shaft is rotatably connected to the inner side of the rotating seat. A retaining spring is sleeved on the outer ring of the rotating shaft. A connecting plate is fixedly connected to the side wall of the retaining spring. A flip cover is welded to the side wall of the connecting plate. The inner side of the cable body is provided with a coating structure, which includes an insulation layer located inside the cable body. The sidewall of the insulation layer is close to the heating wire body. An insulation layer is attached to the inner side of the insulation layer, and an anti-corrosion layer is attached to the outer side of the cable body.

[0006] The beneficial effects of adopting the above-mentioned further solutions are that, through the precise positioning and matching of positioning ring one and positioning ring two, and the installation and matching of heating wire groove and heating wire body, combined with the overall anti-brittleness formula design of the pipe, the protective pipe can still maintain excellent flexibility and structural strength in low-temperature and frigid environments, avoiding cable damage caused by low-temperature brittleness and ensuring the safety of cable laying in high-altitude and cold regions; the multi-layer ring positioning structure replaces the traditional single pipe structure, greatly improving the ring stiffness and impact resistance of the pipe, effectively resisting external forces such as soil pressure and vehicle crushing, protecting the cable from mechanical damage; active heating and intelligent venting provide dual protection; the heating wire body in the heating wire groove can actively heat the cable inside the pipe in low-temperature environments, effectively alleviating the low-temperature hardening of the cable and insulation materials, ensuring the normal transmission and laying convenience of the cable in extremely cold weather; and an intelligent venting structure consisting of a venting ring, venting pipe and flip cover is set up. When the high temperature generated by the cable operation causes a sudden increase in air pressure inside the pipe, it can automatically release air and depressurize; after the temperature drops, the flip cover automatically closes, preventing the pipe from bursting due to thermal expansion and maintaining a sealed environment inside the pipe to prevent moisture and impurities from entering. It integrates insulation, corrosion protection, and heat preservation, providing protection throughout its entire life cycle. The inner insulation layer and anti-corrosion layer form a double protective barrier, effectively isolating soil corrosion and leakage risks, ensuring stable transmission of power and communication signals. It is particularly suitable for harsh and corrosive environments such as coastal areas and chemical plants. The heat preservation layer is tightly attached to the insulation layer, minimizing heat loss from the cable inside the pipe, reducing energy consumption, and simultaneously isolating extreme external heat to maintain long-term stable cable operating temperature. The modular positioning ring and connecting column design enables standardized assembly and splicing, significantly reducing construction difficulty and facilitating later inspection and maintenance. Internal cables can be inspected without completely dismantling the pipe. It also features low-temperature crack resistance, high-temperature explosion-proof properties, strong corrosion resistance, and high insulation, making it suitable not only for municipal power grids and communication base stations in cold regions, but also for a wide range of special industrial scenarios with high corrosion and high risk, such as chemical industrial parks and coastal mudflats. Through a triple mechanism of physical protection, constant temperature protection, and sealed isolation, this pipe significantly reduces the aging rate of cables. Compared with traditional protective pipes, it greatly improves the overall service life and operational reliability of cables, and reduces the operation and maintenance costs throughout the entire life cycle.

[0007] The beneficial effects of this invention are: 1) This invention solves the problems of traditional cable protection pipes being prone to brittleness and freezing hardening in low-temperature environments by setting a heat insulation structure consisting of positioning ring one, positioning ring two, connecting post, and heating wire body inside the cable body. Positioning ring one and positioning ring two achieve axial limiting and radial support through the connecting post, forming a stable cage-like skeleton structure, which greatly improves the overall ring stiffness and impact resistance of the pipe and effectively resists low-temperature brittleness. At the same time, the heating wire groove and wire passage groove opened on the outer wall of positioning ring two provide a reliable installation path and fixing space for the heating wire body, which can actively heat the cable inside the pipe under low-temperature conditions. Combined with the heat insulation layer, it achieves constant temperature protection, effectively avoids low-temperature embrittlement of the cable insulation layer, and significantly improves the reliability of cable operation in cold regions.

[0008] 2) This invention solves the problem of air pressure buildup caused by temperature changes inside the conduit by setting an air venting structure on the outside of the cable body, consisting of an air venting ring, an air venting pipe, a rotating seat, a rotating shaft, a retaining ring, a connecting plate, and a flip cover. When the cable generates heat during operation, causing the air pressure inside the conduit to rise, the gas can push the flip cover to rotate around the rotating shaft, achieving automatic pressure relief. When the air pressure returns to normal, the retaining ring drives the connecting plate and the flip cover to reset, resealing the conduit. This structure not only prevents the conduit from bulging and bursting due to excessive internal pressure, but also prevents external moisture and impurities from entering, effectively maintaining the dryness and cleanliness of the conduit environment and extending the service life of the cable and conduit.

[0009] 3) This invention achieves integrated protection of insulation, corrosion resistance, and heat preservation by setting a multi-layer composite coating structure inside and outside the cable body. The insulation layer is closely attached to the heating wire body, effectively isolating the heating wire from the cable core and avoiding the risk of leakage. The heat preservation layer is located inside the insulation layer, further reducing heat loss and improving heat preservation efficiency. The corrosion protection layer is attached to the outside of the cable body, resisting corrosion from soil, acids, alkalis, moisture, and other environmental factors. Combined with active heating and automatic pressure relief structure, this conduit is not only suitable for cold regions but also adaptable to highly corrosive and high-risk environments such as chemical industrial parks and coastal mudflats. It achieves multiple protections including low-temperature crack resistance, high-temperature expansion resistance, strong corrosion resistance, and high insulation, significantly improving the environmental adaptability and life-cycle stability of the cable protection conduit.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, a limiting block is fixedly connected to the side wall of the connecting column, and an installation groove is provided on the side wall of the limiting block. A double-headed telescopic rod is embedded in the inner side of the installation groove, and a spring is sleeved on the outer ring of the double-headed telescopic rod.

[0012] Furthermore, a buffer plate is fixedly connected to the end of the double-headed telescopic rod II, and an insertion head is fixedly connected to the side wall of the buffer plate. An insertion groove is opened on the side wall of the insertion head, and a plug rod is connected to the side wall of the insertion head.

[0013] Furthermore, an anti-tension ring one and an anti-tension ring two are connected to the inner side of the insertion slot. The anti-tension ring one and the anti-tension ring two pass through the insertion rod. A fixing head is fixedly connected to the side wall of the anti-tension ring one and the anti-tension ring two. A double-headed telescopic rod one is fixedly connected between the fixing heads. A spring one is sleeved on the outer ring of the double-headed telescopic rod one.

[0014] Furthermore, an auxiliary positioning sleeve is provided on the inner side of the cable body. The auxiliary positioning sleeve is located on the inner side of the heating wire body. Heating wire sleeve one and heating wire sleeve two are fixedly connected to the outer wall of the auxiliary positioning sleeve. A support rod is fixedly connected between heating wire sleeve one and heating wire sleeve two.

[0015] Furthermore, the first heating wire sleeve and the second heating wire sleeve are close to the outer side of the heating wire body, and the first heating wire sleeve and the second heating wire sleeve are made of high temperature resistant material.

[0016] Furthermore, the insulation layer is made of cross-linked polyethylene, the heat insulation layer is made of polypropylene, and the anti-corrosion layer is made of neoprene rubber.

[0017] The beneficial effects of adopting the above-mentioned further solution are as follows: the limiting block is fixed to the side wall of the connecting column, and the second double-headed telescopic rod and the second spring are embedded in the installation groove; when the pipe is subjected to axial tension or displacement due to thermal expansion and contraction, the second spring expands and contracts through the second double-headed telescopic rod to buffer the stress, effectively absorbing stress and preventing deformation or breakage of the connecting column and positioning ring, thus improving the stability and fatigue resistance of the structure. The insert rod passes through the insertion groove to fix the insert head to the buffer plate, and the buffer plate is connected to the end of the second double-headed telescopic rod; when the pipe is subjected to radial compression or impact, the buffer plate transmits the force to the second double-headed telescopic rod, which works with the second spring to achieve buffering and shock absorption. At the same time, the insert rod ensures that the insert head will not loosen, improving the impact resistance and displacement resistance of the structure. The insert rod passes through the tensile ring and the insertion groove, and the first double-headed telescopic rod and the first spring provide elastic support for the tensile ring; when the pipe is subjected to axial tension, the tensile ring transmits the tension through the insert rod, and the first spring and the first double-headed telescopic rod undergo expansion and contraction deformation to absorb tensile stress and effectively prevent... The pipe's tensile strength is significantly improved by its ability to withstand pull-throughs. The heating wire body is inserted into the heating wire sleeve, and the support rod fixes the heating wire sleeve to the outer wall of the auxiliary positioning sleeve. The auxiliary positioning sleeve radially limits the heating wire body, preventing it from shifting or tangling, ensuring uniform heating. At the same time, the support rod increases the structural strength of the heating wire sleeve, preventing it from deforming under pressure. The heating wire sleeve is made of high-temperature resistant ceramic or polyimide material, capable of withstanding the high temperatures of the heating wire body during operation. It also prevents direct contact between the heating wire body and the cable body or wire core bundle, preventing high-temperature burns to the insulation layer and improving the safety and service life of the heating structure. The insulation layer is made of cross-linked polyethylene, which has excellent electrical insulation and heat resistance properties and can withstand the operating temperature of the heating wire body for a long time. The heat insulation layer is made of polypropylene, which has a low thermal conductivity and can effectively reduce heat loss. The anti-corrosion layer is made of neoprene rubber, which is resistant to acids and alkalis and corrosion, and can resist the erosion of soil and humid environments, improving the service life of the pipe.

[0018] Furthermore, a first support ring and a second support ring are provided on the inner side of the cable body, a connecting frame is fixedly connected between the first support ring and the second support ring, and an elastic block is fixedly connected between the first support ring and the second support ring.

[0019] Furthermore, the first and second support rings are located outside the limiting block, and the outer walls of the first and second support rings are close to the inner wall of the cable body. The elastic blocks are fixedly connected to the inner wall of the cable body and the outer wall of the limiting block, respectively.

[0020] Furthermore, a wire core bundle is provided inside the cable body, and a wire core body is provided inside the wire core bundle.

[0021] The beneficial effects of adopting the above technical solution are as follows: the support ring abuts against the inner wall of the cable body, and the connecting frame fixes the support ring, providing radial support force for the elastic block; when the pipe is subjected to external compression or internal air pressure changes, the elastic block undergoes elastic deformation to absorb pressure and prevent the pipe from collapsing or bulging. At the same time, the support ring maintains the circular cross-section of the pipe, ensuring sufficient installation space for the core bundle. The support ring is sleeved on the outside of the limiting block, and the elastic block connects the support ring, the limiting block, and the inner wall of the cable body into one unit; when the pipe is subjected to external compression, the support ring transmits the force to the limiting block and the connecting column through the elastic block, forming an overall force-bearing structure, which greatly improves the pipe's resistance to external pressure and prevents pipe deformation. The core body is a conductor for communication or power transmission, and the core bundle integrates multiple core bodies together. The cable body and its internal insulation, heating, and protection structures together provide low-temperature antifreeze, insulation, corrosion protection, and mechanical protection for the core bundle and core body, ensuring stable operation in harsh environments. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of a partial connection structure inside the cable body of the present invention; Figure 3 This is a schematic diagram of the connection structure of the second positioning ring of the present invention; Figure 4 This is a schematic diagram of the connection structure of the heating wire body of the present invention; Figure 5 This is a schematic diagram of the connection structure of the auxiliary positioning sleeve of the present invention; Figure 6 This is a schematic diagram of the connection structure of the support ring of the present invention; Figure 7 This is a schematic diagram of the connection structure of the tensile ring of the present invention; Figure 8 This is a schematic diagram of the connection structure of the insertion head of the present invention; Figure 9 This is a schematic diagram of the coating structure of the present invention; Figure 10 This is a schematic diagram of the connection structure of the venting structure of the present invention.

[0023] The attached diagram lists the components represented by each number as follows: 1. Cable body; 2. Core bundle; 3. Core body; 4. Positioning ring one; 41. Positioning ring two; 42. Mounting head; 43. Connecting post; 44. Limiting block; 45. Mounting groove; 46. Auxiliary positioning sleeve; 47. Wire guide groove; 48. Heating wire body; 49. Heating wire sleeve one; 410. Support rod; 411. Heating wire sleeve two; 412. Tensile ring one; 413. Tensile ring two; 414. Double-headed telescopic rod one; 415. Spring one; 416. 417. Fixed head; 418. Double-headed telescopic rod II; 419. Spring II; 420. Buffer plate; 421. Insertion head; 422. Insertion slot; 423. Insertion rod; 424. Heating wire slot; 5. Support ring I; 51. Support ring II; 52. Elastic block; 53. Connecting frame; 6. Insulation layer; 7. Anti-corrosion layer; 8. Insulation layer; 9. Venting ring; 91. Venting pipe; 92. Rotating seat; 93. Rotating shaft; 94. Snap ring; 95. Connecting plate; 96. Flip cover. Detailed Implementation

[0024] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0025] The present invention provides the following preferred embodiments. like Figure 1-10 As shown, a low-temperature resistant and brittle-resistant protective conduit for communication and power cables includes a cable body 1. An insulation structure is provided on the inner side of the cable body 1. The insulation structure includes a positioning ring 4 and a positioning ring 41 located on the inner side of the cable body 1. A heating wire groove 423 is provided on the outer wall of the positioning ring 41. A heating wire body 48 is provided on the inner side of the heating wire groove 423. An installation head 42 is fixedly connected to the outer wall of the positioning ring 41. A connecting post 43 is fixedly connected between the installation heads 42. A wire groove 47 is provided on the side wall of the connecting post 43. The outer side of the cable body 1 is provided with a venting structure, which includes a venting ring 9 fixedly sleeved on the outer ring of the cable body 1. Multiple venting pipes 91 are fixedly connected to the outer wall of the venting ring 9. A rotating seat 92 is fixedly installed on the top of the venting pipe 91. A rotating shaft 93 is rotatably connected to the inner side of the rotating seat 92. A retaining spring 94 is sleeved on the outer ring of the rotating shaft 93. A connecting plate 95 is fixedly connected to the side wall of the retaining spring 94. A flip cover 96 is welded to the side wall of the connecting plate 95. The inner side of the cable body 1 is provided with a coating structure, which includes an insulation layer 8 located on the inner side of the cable body 1. The sidewall of the insulation layer 8 is close to the heating wire body 48. A heat insulation layer 6 is attached to the inner side of the insulation layer 8, and an anti-corrosion layer 7 is attached to the outer side of the cable body 1. Among them, the precise positioning of positioning ring 4 and positioning ring 41, as well as the installation of heating wire groove 423 and heating wire body 48, combined with the overall anti-brittleness formula design of the pipe, enable the protective pipe to maintain excellent flexibility and structural strength in low temperature and severe cold environments, avoid cable damage caused by low temperature brittleness, and ensure the safety of cable laying in high-altitude and cold regions. The multi-layer ring positioning structure replaces the traditional single pipe structure, which greatly improves the ring stiffness and impact resistance of the pipe, and can effectively resist external forces such as soil pressure and vehicle crushing, protecting the cable from mechanical damage. Active heating and intelligent venting provide dual protection. The heating wire body 48 in the heating wire groove 423 can actively heat the cable in the pipe in low temperature environments, effectively alleviate the low temperature hardening of the cable and insulation materials, and ensure the normal transmission and laying convenience of the cable in extremely cold weather. An intelligent venting structure consisting of venting ring 9, venting pipe 91 and flip cover 96 is set. When the high temperature generated by the cable operation causes a sudden increase in air pressure inside the pipe, it can automatically release air and depressurize; after the temperature drops, the flip cover 96 automatically closes, preventing the pipe from bursting due to thermal expansion and maintaining a sealed environment inside the pipe to prevent moisture and impurities from entering. It integrates insulation, corrosion protection, and heat preservation, providing protection throughout its entire life cycle. The inner insulation layer 8 and anti-corrosion layer 7 form a double protective barrier, effectively isolating soil corrosion and leakage risks, ensuring stable transmission of power and communication signals. It is particularly suitable for harsh and corrosive environments such as coastal areas and chemical plants. The heat preservation layer 6 is tightly attached to the insulation layer 8, minimizing heat loss from the cable inside the pipe, reducing energy consumption, and simultaneously isolating extreme external heat to maintain the long-term stability of the cable's operating temperature. The modular positioning ring and connecting post 43 design enables standardized assembly and splicing, significantly reducing construction difficulty and facilitating later inspection and maintenance. Internal cables can be inspected without completely dismantling the pipe. It also features low-temperature crack resistance, high-temperature explosion-proof properties, strong corrosion resistance, and high insulation, making it suitable not only for municipal power grids and communication base stations in cold regions, but also for a wide range of special industrial scenarios with high corrosion and high risk, such as chemical industrial parks and coastal mudflats. Through a triple mechanism of physical protection, constant temperature protection, and sealed isolation, this pipe significantly reduces the aging rate of cables. Compared with traditional protective pipes, it greatly improves the overall service life and operational reliability of cables, and reduces the operation and maintenance costs throughout the entire life cycle.

[0026] A limiting block 44 is fixedly connected to the side wall of the connecting column 43. The side wall of the limiting block 44 has an installation groove 45. A double-headed telescopic rod 417 is embedded in the inner side of the installation groove 45. A spring 418 is fitted around the outer ring of the double-headed telescopic rod 417. A buffer plate 419 is fixedly connected to the end of the double-headed telescopic rod 417. An insertion head 420 is fixedly connected to the side wall of the buffer plate 419. An insertion groove 421 is opened in the side wall of the insertion head 420. A plug rod 422 is connected to the side wall of the insertion head 420. A tension ring 412 and a tension ring 413 are connected to the inner side of the insertion groove 421. The tension rings 412 and 413 penetrate the plug rod 422. The side walls of the tension rings 412 and 413... A fixing head 416 is fixedly connected, and a double-headed telescopic rod 414 is fixedly connected between the fixing heads 416. A spring 415 is sleeved on the outer ring of the double-headed telescopic rod 414. An auxiliary positioning sleeve 46 is provided on the inner side of the cable body 1. The auxiliary positioning sleeve 46 is located on the inner side of the heating wire body 48. A heating wire sleeve 49 and a heating wire sleeve 411 are fixedly connected to the outer wall of the auxiliary positioning sleeve 46. A support rod 410 is fixedly connected between the heating wire sleeve 49 and the heating wire sleeve 411. The heating wire sleeve 49 and the heating wire sleeve 411 are close to the outer side of the heating wire body 48, and the heating wire sleeve 49 and the heating wire sleeve 411 are made of high temperature resistant material. The insulation layer 8 is made of cross-linked polyethylene material. The insulation layer 6 is made of polypropylene, and the anti-corrosion layer 7 is made of neoprene rubber. The limiting block 44 is fixed to the side wall of the connecting column 43, and the double-headed telescopic rod 417 and the spring 418 are embedded in the mounting groove 45. When the pipe is subjected to axial tension or thermal expansion and contraction, the spring 418 expands and contracts through the double-headed telescopic rod 417 to buffer the stress, effectively absorbing stress and preventing deformation or breakage of the connecting column 43 and the positioning ring 41, thus improving the stability and fatigue resistance of the structure. The insertion rod 422 passes through the insertion groove 421 to fix the insertion head 420 to the buffer plate 419, and the buffer plate 419 is connected to the end of the double-headed telescopic rod 417. When the pipe is subjected to radial compression or impact, the buffer plate 419... 19. The force is transmitted to the double-headed telescopic rod 417, which works with the spring 418 to achieve buffering and shock absorption. At the same time, the insertion rod 422 ensures that the insertion head 420 will not come loose, thus improving the structure's impact resistance and displacement resistance. The insertion rod 422 passes through the tensile ring and the insertion groove 421. The double-headed telescopic rod 414 and the spring 415 provide elastic support for the tensile ring. When the pipe is subjected to axial tension, the tensile ring transmits the tension through the insertion rod 422. The spring 415 and the double-headed telescopic rod 414 undergo telescopic deformation to absorb tensile stress, effectively preventing the pipe from being pulled apart and significantly improving the tensile performance of the pipe. The heating wire body 48 is inserted into the heating wire sleeve, and the support rod 410 fixes the heating wire sleeve to the outer wall of the auxiliary positioning sleeve 46.The auxiliary positioning sleeve 46 radially limits the heating wire body 48 to prevent it from shifting or tangling, ensuring uniform heating. Simultaneously, the support rod 410 enhances the structural strength of the heating wire sleeve, preventing deformation under pressure. The heating wire sleeve is made of high-temperature resistant ceramic or polyimide material, capable of withstanding the high temperatures of the heating wire body 48 during operation. It also prevents direct contact between the heating wire body 48 and the cable body 1 or core bundle 2, preventing high-temperature burns to the insulation layer 8 and improving the safety and service life of the heating structure. The insulation layer 8 is made of cross-linked polyethylene, possessing excellent electrical insulation and heat resistance, and can withstand the long-term operating temperature of the heating wire body 48. The heat insulation layer 6 is made of polypropylene, with low thermal conductivity, effectively reducing heat loss. The anti-corrosion layer 7 is made of neoprene rubber, resistant to acids and alkalis, and corrosion, resisting erosion from soil and humid environments, thus extending the service life of the pipe.

[0027] The inner side of the cable body 1 is provided with a first support ring 5 and a second support ring 51. A connecting frame 53 is fixedly connected between the first support ring 5 and the second support ring 51. An elastic block 52 is fixedly connected between the first support ring 5 and the second support ring 51. The first support ring 5 and the second support ring 51 are located outside the limiting block 44. The outer walls of the first support ring 5 and the second support ring 51 are close to the inner wall of the cable body 1. The elastic block 52 is fixedly connected to the inner wall of the cable body 1 and the outer wall of the limiting block 44, respectively. The inner side of the cable body 1 is provided with a core bundle 2, and the inner side of the core bundle 2 is provided with a core body 3. The support rings are close to the inner wall of the cable body 1, the connecting frame 53 fixes the support rings, and the elastic block 52 provides radial support force. When the pipe is subjected to external compression or internal air pressure changes, the elastic block 52 undergoes elastic deformation and absorbs... The pressure is absorbed to prevent the pipe from collapsing or bulging. At the same time, the support ring maintains the circular cross-section of the pipe, ensuring that the wire core bundle 2 has sufficient installation space. The support ring is sleeved on the outside of the limiting block 44. The elastic block 52 connects the support ring, the limiting block 44, and the inner wall of the cable body 1 into one unit. When the pipe is squeezed by external force, the support ring transmits the force to the limiting block 44 and the connecting post 43 through the elastic block 52, forming an overall force-bearing structure, which greatly improves the pipe's resistance to external pressure and prevents the pipe from deforming. The wire core body 3 is a conductor for communication or power transmission. The wire core bundle 2 integrates multiple wire core bodies 3 together. The cable body 1 and its internal insulation, heating, and protection structures provide low-temperature antifreeze, insulation, corrosion protection, and mechanical protection for the wire core bundle 2 and the wire core body 3, ensuring stable operation in harsh environments.

[0028] The working principle of this invention: When this protective conduit is in operation, the wire core bundle 2 is inserted inside the conduit. The inner insulation layer 6 and the heating wire body 48 work together to achieve heat preservation and antifreeze in low-temperature environments, preventing the cable and conduit from becoming brittle and failing due to low temperatures. The positioning ring, connecting post 43, and internal support ring form a stable skeleton structure, improving the overall rigidity of the conduit and its resistance to compression and tension. When the cable generates heat during operation, causing the air pressure inside the conduit to rise, the flip cover 96 on the vent ring 9 automatically opens to release pressure under the action of air pressure; after the air pressure decreases, the retaining spring 94 drives the flip cover 96 to reset and close, achieving internal and external pressure balance and maintaining a seal. The outer anti-corrosion layer 7 resists the erosion of external corrosive media, and the inner insulation layer 8 isolates electrical hazards. The multi-layer structure works synergistically, enabling the conduit to stably protect the cable and ensure safe operation under complex working conditions such as low temperature, high pressure, and corrosion.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-temperature resistant, crack-resistant protective conduit for communication and power cables, comprising a cable body (1), characterized in that, The inner side of the cable body (1) is provided with a heat insulation structure, which includes a positioning ring one (4) and a positioning ring two (41) located inside the cable body (1). The outer wall of the positioning ring two (41) is provided with a heating wire groove (423). The inner side of the heating wire groove (423) is provided with a heating wire body (48). The outer wall of the positioning ring two (41) is fixedly connected with an installation head (42). The installation heads (42) are fixedly connected with a connecting post (43). The side wall of the connecting post (43) is provided with a wire groove (47). The cable body (1) is provided with a venting structure on its outer side. The venting structure includes a venting ring (9) fixedly sleeved on the outer ring of the cable body (1). Multiple venting pipes (91) are fixedly connected to the outer wall of the venting ring (9). A rotating seat (92) is fixedly installed on the top of the venting pipe (91). A rotating shaft (93) is rotatably connected to the inner side of the rotating seat (92). A retaining ring (94) is sleeved on the outer ring of the rotating shaft (93). A connecting plate (95) is fixedly connected to the side wall of the retaining ring (94). A flip cover (96) is welded to the side wall of the connecting plate (95). The inner side of the cable body (1) is provided with a coating structure, the coating structure includes an insulation layer (8) located inside the cable body (1), the sidewall of the insulation layer (8) is close to the heating wire body (48), the inner side of the insulation layer (8) is provided with a heat insulation layer (6), and the outer side of the cable body (1) is provided with an anti-corrosion layer (7).

2. The low-temperature brittle-resistant protective conduit for communication and power cables according to claim 1, characterized in that, The side wall of the connecting column (43) is fixedly connected to a limiting block (44), and the side wall of the limiting block (44) is provided with an installation groove (45). The inner side of the installation groove (45) is fitted with a double-headed telescopic rod (417), and the outer ring of the double-headed telescopic rod (417) is fitted with a spring (418).

3. The low-temperature resistant, crack-resistant protective conduit for communication and power cables according to claim 2, characterized in that, The end of the double-headed telescopic rod (417) is fixedly connected to a buffer plate (419), and the side wall of the buffer plate (419) is fixedly connected to an insertion head (420). The side wall of the insertion head (420) is provided with an insertion groove (421), and the side wall of the insertion head (420) is connected to a plug rod (422).

4. The low-temperature resistant, crack-resistant protective conduit for communication and power cables according to claim 3, characterized in that, The inner side of the insertion slot (421) is connected to a tension ring one (412) and a tension ring two (413). The insertion rod (422) passes through the tension ring one (412) and the tension ring two (413). The side walls of the tension ring one (412) and the tension ring two (413) are fixedly connected to a fixing head (416). A double-headed telescopic rod one (414) is fixedly connected between the fixing heads (416). A spring one (415) is sleeved on the outer ring of the double-headed telescopic rod one (414).

5. The low-temperature brittle-resistant protective conduit for communication and power cables according to claim 1, characterized in that, An auxiliary positioning sleeve (46) is provided on the inner side of the cable body (1). The auxiliary positioning sleeve (46) is located on the inner side of the heating wire body (48). Heating wire sleeve one (49) and heating wire sleeve two (411) are fixedly connected to the outer wall of the auxiliary positioning sleeve (46). A support rod (410) is fixedly connected between heating wire sleeve one (49) and heating wire sleeve two (411).

6. The low-temperature brittle-resistant protective conduit for communication and power cables according to claim 2, characterized in that, The inner side of the cable body (1) is provided with a first support ring (5) and a second support ring (51). A connecting frame (53) is fixedly connected between the first support ring (5) and the second support ring (51). An elastic block (52) is fixedly connected between the first support ring (5) and the second support ring (51).

7. A low-temperature resistant, crack-resistant protective conduit for communication and power cables according to claim 5, characterized in that, The heating wire sleeve one (49) and heating wire sleeve two (411) are close to the outside of the heating wire body (48), and the heating wire sleeve one (49) and heating wire sleeve two (411) are made of high temperature resistant material.

8. A low-temperature resistant, crack-resistant protective conduit for communication and power cables according to claim 6, characterized in that, The first support ring (5) and the second support ring (51) are located outside the limiting block (44). The outer walls of the first support ring (5) and the second support ring (51) are close to the inner wall of the cable body (1). The elastic block (52) is fixedly connected to the inner wall of the cable body (1) and the outer wall of the limiting block (44) respectively.

9. A low-temperature resistant, crack-resistant protective conduit for communication and power cables according to claim 1, characterized in that, The insulation layer (8) is made of cross-linked polyethylene, the heat insulation layer (6) is made of polypropylene, and the anti-corrosion layer (7) is made of neoprene rubber.

10. A low-temperature resistant, crack-resistant protective conduit for communication and power cables according to claim 1, characterized in that, The inner side of the cable body (1) is provided with a wire core bundle (2), and the inner side of the wire core bundle (2) is provided with a wire core body (3).

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