Low-smoke environmentally friendly low-voltage power cable

Abstract

The application discloses a low-smoke environment-friendly low-voltage power cable and relates to the technical field of power cables. The outer sheath is internally provided with a shaft tube, a plurality of guide rings and shaft pads are uniformly and equidistantly arranged on the outer side of the shaft tube, ring seats are arranged on the outer side of the guide rings, a plurality of arc pads are arranged on the inner wall of the ring seats at equal angles in the circumferential direction, a plurality of telescopic pads and guide valves are arranged on the outer wall of the shaft pads at equal angles in the circumferential direction. The application does not change the formula of the core environment-friendly material, retains the environmental protection and safety, realizes more comprehensive, efficient and persistent dynamic support for the internal structure of the cable through the limiting support and dynamic airflow compensation of the internal wire core, improves the mechanical strength, forms an internal and external double protection mechanism while realizing multiple water resistance, adopts the engineering design of external reinforcement and internal buffering, builds a stronger and more reliable system, and solves the core electrical defects of moisture dissolution of LSZH material and decrease of insulation resistance.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, specifically to a low-smoke, environmentally friendly low-voltage power cable. Background Technology

[0002] Traditional PVC cables release large amounts of dense smoke and corrosive, toxic halogen acid gases, such as hydrogen chloride, during fires. These are the main causes of asphyxiation, poisoning, and equipment corrosion damage. While low-smoke halogen-free environmentally friendly cables improve fire safety and environmental friendliness, their main shortcomings are low mechanical strength and abrasion resistance, limited resistance to environmental and chemical corrosion, flexibility, installation characteristics and temperature adaptability, and insulation resistance that is easily affected by humidity.

[0003] However, current LSZH cables typically enhance tensile and compressive strength by altering the formulation of core environmentally friendly materials. This not only incurs high R&D costs but also compromises the environmental friendliness of the LSZH cable itself. Furthermore, the lack of a stable support structure results in insufficient and unreliable protection for the conductor core. This not only creates blind spots in protection but also makes the cable susceptible to failure due to external impacts. Consequently, the internal structure of the cable is prone to misalignment during use, and the conductor core is easily damaged and broken due to insufficient ductility. The integrity of the cable's main function cannot be guaranteed. Summary of the Invention

[0004] This invention provides a low-smoke, environmentally friendly low-voltage power cable, which can effectively solve the problems mentioned in the background art. Currently, LSZH cables are usually enhanced in terms of tensile strength and compressive strength by changing the formula of core environmentally friendly materials. This not only results in high research and development costs, but also fails to guarantee the environmental friendliness of the LSZH cable itself. Furthermore, the lack of a stable support structure and insufficient and unreliable protection for the conductor core make it prone to blind spots in protection and failure due to external impacts. Consequently, the internal structure of the cable is prone to misalignment during use, and the conductor core is prone to damage and breakage due to insufficient ductility, thus compromising the integrity of the cable's main function.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a low-smoke and environmentally friendly low-voltage power cable, comprising an outer sheath, wherein a dynamic reinforcement mechanism is installed on the inner side of the outer sheath;

[0006] The dynamic reinforcement mechanism includes a shaft tube;

[0007] A shaft tube is inserted inside the outer sheath. Several guide rings and shaft pads are evenly and equidistantly installed on the outer side of the shaft tube. A ring seat is installed on the outer side of the guide ring. Several arc pads are installed at equal angles along the circumferential direction on the inner wall of the ring seat. Several telescopic pads and guide valves are installed at equal angles along the circumferential direction on the outer wall of the shaft pad. A retaining ring is installed at the end of the telescopic pad. An elastic ring is installed on the outer side of the retaining ring. A retaining pad is installed on the inner wall of the elastic ring.

[0008] The outer wall of the shaft pad has a through hole at the position corresponding to the telescopic pad. Several through valves are installed at equal angles along the circumference of the inner wall of the shaft pad. Several partitions are evenly installed at equal intervals inside the shaft tube. Several filter membranes are embedded at equal angles along the circumference of the side end face of the partition. Ribs are inserted through the middle of the side end face of the partition. Several wire cores are inserted at equal angles along the circumference of the inner side of the pad. An insulating sleeve is sleeved on the outside of the wire core. A shielding sleeve is embedded in the outer wall of the insulating sleeve.

[0009] Preferably, the guide ring has a plurality of guide holes at equal angles along the circumferential direction on its side end face, a diaphragm is provided between the outer wall of the guide ring and the inner wall of the ring seat, and the gap between the outer wall of the guide ring, the inner wall of the ring seat and the arc pad is sealed by the diaphragm, the arc pad is connected to the guide ring, and the guide ring is connected to the outer space of the shaft tube through the guide holes.

[0010] Preferably, the number of guide rings and shaft pads is the same, the guide rings and shaft pads are alternately distributed, and the distance between the guide rings and shaft pads is equal to half the distance between two adjacent guide rings.

[0011] Preferably, the telescopic pad and the pilot valve are alternately distributed, the internal space of the shaft pad is connected to the telescopic pad through a through hole, the internal space of the shaft pad is connected to the ring seat through the gap between the pilot valve and the ring seat, the shaft tube is connected to the internal space of the shaft pad through a through valve, and both the pilot valve and the through valve are unidirectional through valves, and the flow direction of the pilot valve and the through valve is from the inside of the cable to the outside of the cable.

[0012] Preferably, the guide ring, shaft washer, and ring seat together form a bottom groove, and the retaining ring, elastic ring, and retaining washer together form a top groove. The wire core passes through each bottom groove and top groove in sequence, and the distance from the top groove to the shaft tube is greater than the distance from the bottom groove to the shaft tube. The outer diameters of the ring seat and elastic ring are the same.

[0013] Preferably, an external protective mechanism is installed on the outside of the dynamic reinforcement mechanism;

[0014] The external protective mechanism includes an inner sheath;

[0015] An inner sheath is fitted around the outer side of the ring seat and the elastic ring. An aluminum-plastic sleeve is fitted around the outer side of the inner sheath. Several limiting rings are evenly installed at equal intervals on the outer wall of the aluminum-plastic sleeve. A limiting sleeve is fitted around the outer side of the limiting rings. An annular groove is opened on the inner wall of the limiting sleeve at the position corresponding to the limiting ring. Several winding tubes are wound at equal angles along the circumferential direction on the outer wall of the limiting sleeve. Several protective shells are evenly installed at equal intervals on the outer wall of the limiting sleeve. Water-resistant yarn is filled at the gap position between the winding tubes on the outer side of the limiting sleeve.

[0016] The inner wall of the protective shell, the outer wall of the inner sheath, and the outer wall of the aluminum-plastic sheath are all provided with a number of connecting holes at equal angles along the circumference. Protective rings are symmetrically installed on both sides of the inner wall of the protective shell. A guide port is provided on the side end face of the protective shell at the corresponding position of the tube. A support ring is installed on the outer wall of the protective shell. A number of grooves are provided at equal angles along the circumference on the side end face of the support ring. A cable sleeve is fitted on the outer side of the protective shell. A number of partition rings are evenly installed at equal intervals on the inner wall of the outer sheath. A valve is installed on the side end face of the partition ring.

[0017] Preferably, the annular groove fits into the limiting ring, the partition ring is located on both sides of the support ring, and the partition ring fits into the support ring.

[0018] Preferably, the end of the winding tube is fixedly connected to the protective shell, and the end of the cable loop is fixedly connected to the support ring.

[0019] Preferably, the limiting ring, protective ring, and support ring are all made of water-swellable waterproof rubber, the valve is a one-way valve, and the gap between the valve and the winding tube is connected.

[0020] Preferably, both the sheath and the winding tube are mesh structures, the sheath is made of steel wire, the winding tube is made of elastic rubber, the water-blocking yarn fits the gap formed by the limiting sleeve, the protective shell, the sheath, and the winding tube, and the winding tube is spirally distributed.

[0021] Compared with the prior art, the advantages of the present invention are: the present invention has a scientific and reasonable structure and is safe and convenient to use;

[0022] 1. Equipped with a dynamic reinforcement mechanism, which uses a shaft tube, guide ring, shaft pad, telescopic pad, and retaining ring to construct an axial limiting support structure, providing stable elastic support and protection for the conductor and limiting and guiding it. With the synchronous support of the ring seat and elastic ring, it provides stable displacement compensation space for the conductor. On the one hand, it can resist and transform external force impacts such as pulling, squeezing, and bending during cable installation and use. On the other hand, it provides stable driving force for the telescopic pad, pulls external airflow and uses the external airflow to wrap and support the conductor, and provides elastic support for the internal structure of the cable. While resisting external impact forces, it can effectively maintain the stability of the internal structure of the cable, effectively limit the displacement path of the conductor, make up for the non-extensible defect of the conductor, and avoid conductor damage and breakage.

[0023] In addition, the flow-limiting and guiding functions of the pilot valve, through-hole, through-valve, diaphragm, filter membrane, and shaft tube enable continuous replenishment of the internal support gas of the cable, compensating for the air pressure loss caused by airflow leakage. It transforms external impact force into a driving force for real-time airflow filling, effectively reducing support blind spots and achieving more efficient and comprehensive support protection. It effectively solves the problem of protection dead angles caused by deformation and wear in traditional cable support structures during long-term use. By filling with airflow in real time, it achieves a more durable support protection effect. On the other hand, it can be used in conjunction with ring seat, arc pad, elastic ring, clamping pad, rib, guide hole, and diaphragm to provide multiple supports for the core along the cable axis, forming multiple mechanical support limits. Combined with airflow support, it greatly improves the resistance to external impact force, thereby achieving dual compensation for the mechanical properties of LSZH cable.

[0024] 2. An external protective mechanism is provided. Through the cooperation of the inner sheath, aluminum-plastic sleeve and limiting sleeve, an external water-locking structure can be constructed to provide a stable protective barrier for the cable and prevent water vapor intrusion. In addition, the limiting ring, annular groove, protective ring, support ring and isolation ring limit locking action can simultaneously perform auxiliary compression and clamping on the inner sheath, extruded aluminum-plastic sleeve, limiting sleeve and outer sheath to ensure the fit between the inner sheath, extruded aluminum-plastic sleeve, limiting sleeve and outer sheath. It can also form multiple water-blocking protective rings along the cable axis to form a multiple blocking mechanism to effectively prevent water vapor intrusion.

[0025] It can be used in conjunction with winding tubes, protective shells, water-blocking yarn, connecting holes, guide ports, grooves, and valves to guide the air inside the cable. In addition, the dynamic reinforcement mechanism continuously compensates for the airflow, which can create airflow obstruction and form convection with the invading moisture. While obstructing the intrusion of moisture, it can also carry moisture out in the opposite direction and perform auxiliary drying. In addition, the water-blocking yarn will absorb the residual moisture, which can form multiple obstacles to moisture. This fundamentally solves the core electrical defect of LSZH material that is prone to deliquescence and causes a decrease in insulation resistance. On the other hand, it can be used in conjunction with cable sleeves to give the internal structure of the cable a concentric contraction binding force, limit and lock it, prevent its misalignment and displacement, and ensure the stability and balance of the main structure of the cable.

[0026] In summary, this cable addresses the inherent weaknesses in the mechanical properties of LSZH cables. While maintaining the core environmentally friendly material formula and preserving its environmental friendliness and safety, it achieves more comprehensive, efficient, and durable dynamic support for the internal structure of the cable through limiting support of the internal conductors and dynamic airflow compensation, thereby enhancing its mechanical strength. Furthermore, through the external structure, it achieves multiple water-blocking mechanisms, forming a dual internal and external protection mechanism to compensate for the performance limitations of the LSZH material itself. With an engineering design combining external reinforcement and internal buffering, it constructs a stronger and more reliable system, solving the core electrical defect of LSZH material—its susceptibility to deliquescence and resulting decrease in insulation resistance. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0028] In the attached diagram:

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the wire core mounting structure of the present invention;

[0031] Figure 3 This is a schematic diagram of the dynamic reinforcement mechanism of the present invention;

[0032] Figure 4 This is a schematic diagram of the retaining ring mounting structure of the present invention;

[0033] Figure 5 This is a schematic diagram of the partition installation structure of the present invention;

[0034] Figure 6 This is a schematic diagram of the external protective mechanism structure of the present invention;

[0035] Figure 7 This is a schematic diagram of the support ring installation structure of the present invention;

[0036] The diagram is labeled as follows: 1. Outer sheath; 11. Wire core; 12. Insulating sleeve; 13. Shielding sleeve;

[0037] 20. Dynamic reinforcement mechanism; 201. Shaft tube; 202. Guide ring; 203. Shaft pad; 204. Ring seat; 205. Arc pad; 206. Telescopic pad; 207. Pilot valve; 208. Snap ring; 209. Elastic ring; 210. Snap pad; 211. Through hole; 212. Through valve; 213. Partition; 214. Filter membrane; 215. Rib; 216. Guide hole; 217. Diaphragm;

[0038] 21. Bottom groove; 22. Top groove;

[0039] 30. External protective mechanism; 301. Inner sheath; 302. Aluminum-plastic sleeve; 303. Limiting ring; 304. Limiting sleeve; 305. Annular groove; 306. Winding tube; 307. Protective shell; 308. Water-blocking yarn; 309. Connecting hole; 310. Protective ring; 311. Flow guide; 312. Support ring; 313. Groove; 314. Isolation ring; 315. Valve; 316. Cable sleeve. Detailed Implementation

[0040] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0041] Example: Figure 1-7 As shown, the present invention provides a technical solution, a low-smoke and environmentally friendly low-voltage power cable, including an outer sheath 1, and a dynamic reinforcement mechanism 20 installed on the inner side of the outer sheath 1.

[0042] The dynamic reinforcement mechanism 20 includes a shaft tube 201;

[0043] A shaft tube 201 is inserted inside the outer sheath 1. Several guide rings 202 and shaft pads 203 are evenly installed at equal intervals on the outer side of the shaft tube 201. The number of guide rings 202 and shaft pads 203 is the same. The guide rings 202 and shaft pads 203 are alternately distributed, and the distance between the guide rings 202 and shaft pads 203 is equal to half the distance between two adjacent guide rings 202 for limiting support. A ring seat 204 is installed on the outer side of the guide ring 202. Several arc pads 205 are installed at equal angles along the circumferential direction on the inner wall of the ring seat 204. Several telescopic pads 206 and pilot valves 207 are installed at equal angles along the circumferential direction on the outer wall of the shaft pad 203. A retaining ring 208 is installed at the end of the telescopic pad 206. An elastic ring 209 is installed on the outer side of the retaining ring 208. A retaining pad 210 is installed on the inner wall of the elastic ring 209.

[0044] A through hole 211 is provided on the outer wall of the shaft pad 203 at the position corresponding to the telescopic pad 206. Several through valves 212 are installed at equal angles along the circumferential direction on the inner wall of the shaft pad 203. The telescopic pad 206 and the pilot valve 207 are alternately distributed. The internal space of the shaft pad 203 is connected to the telescopic pad 206 through the through hole 211. The internal space of the shaft pad 203 is connected to the ring seat 204 through the gap between the pilot valve 207 and the ring seat 204. The shaft tube 201 is connected to the internal space of the shaft pad 203 through the through valve 212. Both the pilot valve 207 and the through valve 212 are unidirectional through valves. The flow direction of the pilot valve 207 and the through valve 212 is from the inside of the cable to the outside of the cable for directional support.

[0045] A number of partitions 213 are evenly and equidistantly installed inside the shaft tube 201. A number of filter membranes 214 are embedded at equal angles along the circumferential direction on the side end face of the partitions 213. Ribs 215 are inserted through the middle of the side end face of the partitions 213. A number of wire cores 11 are inserted at equal angles along the circumferential direction on the inner side of the retaining pad 210. An insulating sleeve 12 is sleeved on the outer side of the wire cores 11. A shielding sleeve 13 is embedded in the outer wall of the insulating sleeve 12. The guide ring 202, shaft pad 203 and ring seat 204 form a bottom groove 21. The retaining ring 208, elastic ring 209 and retaining pad 210 form a top groove 22. The wire cores 11 pass through each bottom groove 21 and top groove 22 in sequence. The distance between the top groove 22 and the shaft tube 201 is greater than the distance between the bottom groove 21 and the shaft tube 201. The outer diameters of the ring seat 204 and the elastic ring 209 are the same to provide internal support.

[0046] The guide ring 202 has several guide holes 216 at equal angles along the circumferential direction on its side end face. A diaphragm 217 is provided between the outer wall of the guide ring 202 and the inner wall of the ring seat 204. The gap between the outer wall of the guide ring 202, the inner wall of the ring seat 204 and the arc pad 205 is blocked by the diaphragm 217. The arc pad 205 is connected to the guide ring 202. The guide ring 202 is connected to the outer space of the shaft tube 201 through the guide holes 216.

[0047] An external protective mechanism 30 is installed on the outside of the dynamic reinforcement mechanism 20;

[0048] The external protective mechanism 30 includes an inner sheath 301;

[0049] An inner sheath 301 is sleeved on the outside of the ring seat 204 and the elastic ring 209. An aluminum-plastic sleeve 302 is sleeved on the outside of the inner sheath 301. Several limiting rings 303 are evenly installed on the outer wall of the aluminum-plastic sleeve 302 at equal intervals. A limiting sleeve 304 is sleeved on the outside of the limiting rings 303. An annular groove 305 is opened on the inner wall of the limiting sleeve 304 at the position corresponding to the limiting rings 303. Several winding tubes 306 are wound at equal angles along the circumferential direction on the outer wall of the limiting sleeve 304. Several protective shells 307 are evenly installed on the outer wall of the limiting sleeve 304 at equal intervals. Water-resistant yarn 308 is filled in the gap between the winding tubes 306 on the outside of the limiting sleeve 304.

[0050] The inner wall of the protective shell 307, the outer wall of the inner sheath 301, and the outer wall of the aluminum-plastic sleeve 302 are all provided with a number of connecting holes 309 at equal angles along the circumference. Protective rings 310 are symmetrically installed on both sides of the inner wall of the protective shell 307. A guide port 311 is provided on the side end face of the protective shell 307 at the position corresponding to the winding tube 306. A support ring 312 is installed on the outer wall of the protective shell 307. A number of grooves 313 are provided at equal angles along the circumference on the side end face of the support ring 312. A cable sleeve is fitted onto the outer side of the protective shell 307. 316, the end of the coiled tube 306 is fixedly connected to the protective shell 307, and the end of the cable loop 316 is fixedly connected to the support ring 312 for external protection. Both the cable loop 316 and the coiled tube 306 are mesh structures. The cable loop 316 is made of steel wire, and the coiled tube 306 is made of elastic rubber. The water-blocking yarn 308 fits into the gap formed by the limiting sleeve 304, the protective shell 307, the cable loop 316 and the coiled tube 306. The coiled tube 306 is spirally distributed to prevent water vapor from entering.

[0051] A number of partition rings 314 are evenly installed on the inner wall of the outer sheath 1 at equal intervals. The ring groove 305 fits into the limiting ring 303. The partition rings 314 are located on both sides of the support ring 312 and fit into the support ring 312 for limiting protection. A valve 315 is installed on the side end face of the partition ring 314. The limiting ring 303, the protective ring 310 and the support ring 312 are all water-swellable waterproof rubber. The valve 315 is a one-way valve and the gap between the valve 315 and the winding tube 306 is connected to prevent water from entering.

[0052] The working principle and usage process of this invention: When this cable is used in practice, the size and specifications of the cable are first selected according to the actual power supply and distribution needs, so that its power transmission capacity matches the actual load requirements. After selecting the appropriate size and specifications of the cable, the relevant wiring connection work of the core 11 is completed, and then the normal power transmission work can be carried out.

[0053] During the installation and subsequent use of cables, it is inevitable that the cables will be subjected to external forces such as pulling, squeezing, and bending. In this process, the cable sleeve 316 will be the first to be impacted. Its mesh braided structure will adapt and deform, generating a centripetal contraction binding force, thereby tightening the internal structure more tightly and forming an adaptive protection that gets tighter as it is pulled, preventing the internal structure of the cable from loosening. It can also spread and transmit the impact force along the circumference and axial direction of the cable. In addition, the spiral winding method of the tube 306 can further assist in the transmission of the impact force, expand the force-bearing surface, and initially disperse the impact force, avoiding local hard impact on the internal core 11 structure.

[0054] Simultaneously, the weakened impact force is applied to the elastic ring 209, which deforms elastically to further weaken the impact force. Subsequently, the impact force acts on the wire core 11, which presses against the retaining ring 208 under the impact of the external force. Under this pressure, the retaining ring 208 squeezes the inner telescopic pad 206, which then contracts under the pressure of the retaining ring 208. This causes the wire core 11 at the top groove 22 to move closer to the shaft tube 201, and the bottom groove 21 and the top groove 22 to gradually become aligned. The wire core 11 then stretches out and undergoes adaptive small displacement to avoid hard bending and pulling and breakage under the impact of the external force, thus compensating for its non-extensibility.

[0055] As the external impact force is dispersed and exhausted, the elastic ring 209 and the retaining ring 208 will reset under the action of elasticity, and the telescopic pad 206 will also reset and expand accordingly. During the contraction and expansion of the telescopic pad 206, under the connection of the through hole 211, it will generate a directional traction force on the air inside the shaft pad 203. In addition, with the flow-limiting and guiding effect of the pilot valve 207 and the through valve 212, the external airflow will be introduced into the shaft tube 201, filtered by the filter membrane 214, and then pass through the through valve 212 along the shaft tube 201, enter the shaft pad 203, and pass through the pilot valve 207 to inject into the gap between the ring seats 204.

[0056] Furthermore, while providing elastic support to the inner sheath 301 to resist the residual stress of external impact, it can also provide the elastic ring 209 and the retaining ring 208 with a reverse drag force opposite to the direction of the external impact, strengthening their reset tendency and jointly resisting the external impact. It can also work in conjunction with the external clamping effect of the cable sleeve 316 to jointly maintain the compactness of the internal structure of the cable, limit the misalignment of the internal structure, and ensure the stability of the internal structure and the integrity of the protective function.

[0057] With the guide hole 216 connected, the air injected into the gap between the ring seats 204 will also be injected into the guide ring 202 and then into the arc pad 205. The arc pad 205 will expand accordingly, squeezing the wire core 11 and locking the wire core 11 with the guide ring 202 and the ring seat 204. This allows the wire core 11 to squeeze the retaining ring 208 during a small stretching displacement, making the telescopic pad 206 more stable in elastic expansion and contraction, achieving more stable traction of the airflow. In turn, the airflow will give the arc pad 205 more stable support, thus forming a stable closed-loop complementary force.

[0058] In addition, with the action of external impact, the expansion pad 206 will expand and contract synchronously, and the traction airflow will compensate for the air inside the gap between the ring seats 204 in a timely manner, which can effectively make up for the airflow loss caused by natural airflow dissipation and continuously ensure the stability of the internal structure of the cable. Moreover, during this process, the rib 215 will provide auxiliary limitation on the extension, stretching and bending degree of the cable, and form a double limiting mechanism with the cable sleeve 316.

[0059] During cable use, moisture erosion is inevitable. As moisture enters the cable, the limiting ring 303, protective ring 310, and support ring 312 will expand as they absorb moisture. The limiting ring 303 will further compress the internal space of the annular groove 305, simultaneously compressing the aluminum-plastic sleeve 302 and the limiting sleeve 304, and providing auxiliary compression and tightening to the inner sheath 301. This ensures the fit between the inner sheath 301, the aluminum-plastic sleeve 302, and the limiting sleeve 304, forming multiple water-blocking protective rings along the cable axis to prevent moisture intrusion.

[0060] During the expansion of the protective ring 310, it will simultaneously squeeze the limiting sleeve 304 and the protective shell 307, making the connection between the protective shell 307 and the limiting sleeve 304 tighter, blocking the direct communication between the connecting hole 309 and the outer space of the limiting sleeve 304. In addition, the support ring 312 will expand and squeeze the outer protective sleeve 1, preventing the inner space of the outer protective sleeve 1 from being directly connected to the outside. With the unidirectional airflow guidance of the valve 315, it can cooperate with the winding tube 306 to provide subsequent traction guidance for the air inside the gap between the ring seats 204.

[0061] As the telescopic pad 206 reciprocates, it introduces external air into the gap between the ring seats 204. In the subsequent process, the airflow passes through the connecting hole 309 into the protective shell 307, and then enters the winding tube 306 through the guide port 311. As it flows along the winding tube 306, it gradually seeps out of the winding tube 306, passes through the water-blocking yarn 308, and flows along the inner wall of the outer sheath 1. It will form convection with the intruding water vapor, hindering the intrusion of water vapor. At the same time, because it will carry the heat emitted by the core 11, it will assist in drying the water vapor during the flow. Finally, it will carry water vapor and be discharged through the air valve 315. In addition, the water-blocking yarn 308 will absorb the participating water vapor, which can form multiple obstacles to water vapor, fundamentally solving the core electrical defect of LSZH material being prone to deliquescence and causing a decrease in insulation resistance.

[0062] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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-smoke, environmentally friendly low-voltage power cable, comprising an outer sheath (1), characterized in that: A dynamic reinforcement mechanism (20) is installed on the inner side of the outer sheath (1); The dynamic reinforcement mechanism (20) includes a shaft tube (201); The outer sheath (1) has a shaft tube (201) inserted inside. A number of guide rings (202) and shaft pads (203) are evenly installed on the outer side of the shaft tube (201). A ring seat (204) is installed on the outer side of the guide ring (202). A number of arc pads (205) are installed at equal angles along the circumferential direction on the inner wall of the ring seat (204). A number of telescopic pads (206) and pilot valves (207) are installed at equal angles along the circumferential direction on the outer wall of the shaft pad (203). A retaining ring (208) is installed at the end of the telescopic pad (206). An elastic ring (209) is installed on the outer side of the retaining ring (208). A retaining pad (210) is installed on the inner wall of the elastic ring (209). The outer wall of the shaft pad (203) is provided with a through hole (211) at the position of the telescopic pad (206). Several through valves (212) are installed at equal angles along the circumferential direction on the inner wall of the shaft pad (203). Several partitions (213) are evenly installed at equal intervals inside the shaft tube (201). Several filter membranes (214) are embedded at equal angles along the circumferential direction on the side end face of the partition (213). Ribs (215) are inserted through the middle of the side end face of the partition (213). Several wire cores (11) are inserted at equal angles along the circumferential direction on the inner side of the pad (210). An insulating sleeve (12) is sleeved on the outer side of the wire core (11). A shielding sleeve (13) is embedded in the outer wall of the insulating sleeve (12).

2. The low-smoke, environmentally friendly low-voltage power cable according to claim 1, characterized in that, The guide ring (202) has a plurality of guide holes (216) at equal angles along the circumferential direction on its side end face. A diaphragm (217) is provided between the outer wall of the guide ring (202) and the inner wall of the ring seat (204). The gap between the outer wall of the guide ring (202), the inner wall of the ring seat (204) and the arc pad (205) is blocked by the diaphragm (217). The arc pad (205) is connected to the guide ring (202). The guide ring (202) is connected to the outer space of the shaft tube (201) through the guide holes (216).

3. The low-smoke, environmentally friendly low-voltage power cable according to claim 1, characterized in that, The number of guide rings (202) and shaft pads (203) is the same. The guide rings (202) and shaft pads (203) are distributed alternately, and the distance between the guide rings (202) and shaft pads (203) is equal to half the distance between two adjacent guide rings (202).

4. The low-smoke, environmentally friendly low-voltage power cable according to claim 1, characterized in that, The telescopic pad (206) and the pilot valve (207) are alternately distributed. The internal space of the shaft pad (203) is connected to the telescopic pad (206) through the through hole (211). The internal space of the shaft pad (203) is connected to the ring seat (204) through the gap between the pilot valve (207) and the ring seat (204). The shaft tube (201) is connected to the internal space of the shaft pad (203) through the through valve (212). Both the pilot valve (207) and the through valve (212) are unidirectional through valves. The flow direction of the pilot valve (207) and the through valve (212) is from the inside of the cable to the outside of the cable.

5. The low-smoke, environmentally friendly low-voltage power cable according to claim 1, characterized in that, The guide ring (202), shaft pad (203) and ring seat (204) together form a bottom groove (21), and the retaining ring (208), elastic ring (209) and retaining pad (210) together form a top groove (22). The wire core (11) passes through each bottom groove (21) and top groove (22) in sequence. The distance between the top groove (22) and the shaft tube (201) is greater than the distance between the bottom groove (21) and the shaft tube (201). The outer diameters of the ring seat (204) and the elastic ring (209) are the same.

6. The low-smoke, environmentally friendly low-voltage power cable according to claim 1, characterized in that, An external protective mechanism (30) is installed on the outside of the dynamic reinforcement mechanism (20); The external protective mechanism (30) includes an inner sheath (301); An inner sheath (301) is sleeved on the outer side of the ring seat (204) and the elastic ring (209). An aluminum-plastic sleeve (302) is sleeved on the outer side of the inner sheath (301). A number of limiting rings (303) are evenly installed on the outer wall of the aluminum-plastic sleeve (302). A limiting sleeve (304) is sleeved on the outer side of the limiting rings (303). An annular groove (305) is opened on the inner wall of the limiting sleeve (304) at the position corresponding to the limiting rings (303). A number of winding tubes (306) are wound at equal angles along the circumferential direction on the outer wall of the limiting sleeve (304). A number of protective shells (307) are evenly installed on the outer wall of the limiting sleeve (304). Water-resistant yarn (308) is filled at the gap position between the winding tubes (306) on the outer side of the limiting sleeve (304). The inner wall of the protective shell (307), the outer wall of the inner sleeve (301), and the outer wall of the aluminum-plastic sleeve (302) are all provided with a number of connecting holes (309) at equal angles along the circumferential direction. Protective rings (310) are symmetrically installed on both sides of the inner wall of the protective shell (307). A guide port (311) is provided on the side end face of the protective shell (307) at the position corresponding to the winding pipe (306). A support ring (312) is installed on the outer wall of the protective shell (307). A number of grooves (313) are provided on the side end face of the support ring (312) at equal angles along the circumferential direction. A cable sleeve (316) is sleeved on the outer side of the protective shell (307). A number of partition rings (314) are evenly installed at equal intervals on the inner wall of the outer sleeve (1). A valve (315) is installed on the side end face of the partition ring (314).

7. The low-smoke, environmentally friendly low-voltage power cable according to claim 6, characterized in that, The annular groove (305) fits into the limiting ring (303), and the partition ring (314) is located on both sides of the support ring (312), and the partition ring (314) fits into the support ring (312).

8. The low-smoke, environmentally friendly low-voltage power cable according to claim 6, characterized in that, The end of the winding tube (306) is fixedly connected to the protective shell (307), and the end of the cable loop (316) is fixedly connected to the support ring (312).

9. A low-smoke, environmentally friendly low-voltage power cable according to claim 6, characterized in that, The limiting ring (303), the protective ring (310) and the support ring (312) are all water-swellable waterproof rubber, the valve (315) is a one-way valve, and the gap between the valve (315) and the winding tube (306) is connected.

10. A low-smoke, environmentally friendly low-voltage power cable according to claim 6, characterized in that, Both the cable sleeve (316) and the winding tube (306) are mesh structures. The cable sleeve (316) is made of steel wire, and the winding tube (306) is made of elastic rubber. The gap formed by the water-blocking yarn (308) and the limiting sleeve (304), the protective shell (307), the cable sleeve (316) and the winding tube (306) fits together. The winding tube (306) is distributed in a spiral shape.

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