A polyvinyl chloride cable

Abstract

The present application relates to the technical field of cable, particularly relates to a polyvinyl chloride cable, which comprises cable bodies, the number of the cable bodies is two, the two cable bodies are connected through a wiring unit, and a protection unit is further arranged between the two cable bodies, the protection unit comprises an inner sealing mechanism, an intermediate buffering mechanism and an outer protection mechanism. The present application designs the triple protection structure of the inner sealing, the intermediate buffering and the outer protection, and can automatically complete the airtight heat preservation or ventilation and heat dissipation according to the environmental temperature, accurately adapts to the short board of the poor heat resistance and the brittle fracture of the polyvinyl chloride material at low temperature; meanwhile, the protection unit adopts the detachable split structure which is symmetrical up and down, breaks the limitation of the traditional glue pouring protection solidification permanent storage, does not need to damage the colloid during maintenance, the protection part can be repeatedly used, and the maintenance operation difficulty and cost are greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and in particular to a polyvinyl chloride cable. Background Technology

[0002] Polyvinyl chloride (PVC) cables are cable devices used for signal transmission. The insulation material is PVC, and the conductor materials are mainly copper and aluminum. They are widely used in the construction industry. In actual operation, it is often necessary to connect multiple cable sections for use. PVC has poor heat resistance and easily hardens and becomes brittle at low temperatures, resulting in a sharp decrease in its bending / impact resistance. The connection points are the weakest and most prone to failure parts of the entire cable, making it necessary to strengthen their protection.

[0003] Common protective methods include electrical tape wrapping, heat shrink tubing wrapping, and glue-filled junction box connections. Among these, glue-filled junction boxes provide protection by creating a completely sealed, insulating, and shockproof solid protective layer after the two-component resin inside the sealed box cures. Compared to other protective methods, this offers superior mechanical and electrical protection and is suitable for cable connections in harsh environments or critical locations. However, once the glue cures, the connection is permanently sealed. Repairing or replacing the connector requires completely destroying the glue, which is very difficult and usually necessitates replacing the entire junction box and remaking the connector, resulting in high maintenance costs.

[0004] In addition, the colloid has poor thermal conductivity. In the low temperature environment of winter, it can play a good role in heat preservation and protection. However, in the high temperature environment of summer, the heat at the cable connection cannot be dissipated. The heat continues to accumulate, accelerating the aging, softening and thermal deformation of the cable, resulting in a decline in insulation performance, a surge in the risk of leakage and breakdown, and a series of safety hazards. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a polyvinyl chloride cable to solve the technical problems existing in the prior art. A polyvinyl chloride cable includes a cable body, the number of cable bodies is two, the two cable bodies are connected by a wiring unit, and a protective unit is also provided between the two cable bodies.

[0006] The protective unit includes an inner sealing mechanism, an intermediate buffer mechanism, and an outer protective mechanism.

[0007] The inner sealing mechanism includes a sealing cylinder, which is fixed to the cable body by a locking member, and a ventilation component is provided on the sealing cylinder.

[0008] The outer protective mechanism includes a positioning cover and a protective inner cylinder. There are two positioning covers and two protective inner cylinders, which are horizontally symmetrically distributed on both sides of the cable body docking point. The inner protective cylinder and the inner side of the positioning cover are in horizontal sliding contact. The two positioning covers are connected by a connecting component, and the connecting component is equipped with a drive component that drives the protective inner cylinder to move horizontally.

[0009] Preferably, the sealing cylinder is composed of two symmetrical sealing half-cylinders, the positioning cover is composed of two symmetrical positioning half-cylinders, and the protective inner cylinder is composed of two symmetrical protective half-cylinders.

[0010] The sealing half-cylinder has a positioning protrusion on its side wall, and two horizontally symmetrical positioning half-cylinders have positioning grooves on their opposite sides. The protective half-cylinder has an injection cavity inside, and an injection port on the protective half-cylinder that communicates with the injection cavity. Adhesive is injected into the injection cavity through the injection port. The positioning half-cylinder has a clearance groove to avoid the injection port.

[0011] Preferably, sealing gaskets are provided on the opposing surfaces of the two sealing half-cylinders, the opposing surfaces of the two positioning half-cylinders, and the opposing surfaces of the two protective half-cylinders.

[0012] Preferably, there are two intermediate buffer mechanisms, and the two intermediate buffer mechanisms are horizontally symmetrically distributed on both sides of the cable body connection. The intermediate buffer mechanism includes two rubber semi-rings that are symmetrically arranged vertically. The inner wall of the protective semi-cylinder is provided with a limiting groove for installing the rubber semi-rings.

[0013] Preferably, the ventilation assembly includes a ventilation opening and a control component for controlling the opening and closing state of the ventilation opening. The ventilation opening is located on the side wall of the sealed cylinder, the control component is installed inside the sealed cylinder, and a filter screen is installed inside the ventilation opening.

[0014] Preferably, the connecting assembly includes two symmetrical connecting half-rings, which are detachably connected. The arc-shaped sidewalls of the connecting half-rings are evenly provided with multiple strip-shaped through holes. The two sides of the connecting half-rings are provided with half-ring grooves along their width direction. The horizontal sidewalls of the half-ring grooves are provided with insert rods. The opposite ends of the horizontally symmetrical positioning half-cylinders are provided with insertion holes.

[0015] Preferably, the drive assembly includes a plurality of sliding grooves evenly opened on the inner side of the connecting semi-ring, the sliding grooves and strip-shaped through holes are distributed alternately, a slider is slidably installed in the sliding groove, and a drive plate made of bimetallic sheet is connected between the slider and the sliding groove.

[0016] Two horizontally symmetrical protective half-cylinders are provided with mounting protrusions on opposite sides, and a return spring is connected between the mounting protrusions and the sliding groove; the sliders located directly above and below are provided with docking rods on the side near the protective half-cylinders, and docking holes corresponding to the positions of the docking rods are opened on the protective half-cylinders.

[0017] Preferably, the control component includes a valve plate horizontally installed on the inner wall of the sealed cylinder and a movable plate fixedly installed on the inner wall of the closed cylinder. The movable plate is made of bimetallic strip material, and the valve plate has a connecting hole. The valve plate and the movable plate are fixedly connected.

[0018] Preferably, the locking element is an internal threaded sleeve with a conical internal structure and a conical end of the sealing cylinder. There are two internal threaded sleeves, which correspond to the two ends of the sealing cylinder respectively. The internal threaded sleeve is threadedly connected to the cable body. When the internal threaded sleeve is tightened on the cable body, the inner wall of the internal threaded sleeve fits against the end of the sealing cylinder.

[0019] Preferably, the limiting grooves on the two horizontally symmetrically distributed protective semi-cylinders are connected to each other on opposite sides, and a protective membrane is provided between the two horizontally symmetrically distributed rubber semi-rings, with the upper and lower symmetrical protective membranes forming a ring structure.

[0020] As can be seen from the above technical solutions, the polyvinyl chloride (PVC) cable designed in this invention has the following beneficial effects: This invention designs a triple protection structure with inner sealing, intermediate buffer, and outer protection working in synergy. It can automatically complete sealing and heat preservation or ventilation and heat dissipation according to the ambient temperature, precisely adapting to the material shortcomings of PVC, which has poor heat resistance and is prone to brittleness at low temperatures. At the same time, the protection unit adopts a symmetrical, detachable and modular structure, breaking the limitation of traditional glue-based protection that is permanently sealed after curing. During maintenance, there is no need to damage the glue, and the protection components can be reused, greatly reducing the difficulty and cost of maintenance operations. The entire control process does not require external power supply or manual intervention, making it suitable for outdoor, remote construction sites, and other scenarios without power supply. The modular structure also features convenient installation and precise positioning. Overall, it achieves comprehensive improvement in terms of protection performance, environmental adaptability, installation and maintenance, and safety of use, effectively solving the pain points of existing PVC cable joint protection methods and significantly extending the service life of the cable. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a three-dimensional structural diagram of the present invention after the positioning cover is removed.

[0024] Figure 3 This is the front view of the present invention.

[0025] Figure 4 This is a side view of the present invention.

[0026] Figure 5 It is a three-dimensional structural diagram of the cable body and the inner sealing mechanism.

[0027] Figure 6 This is a front sectional view of the present invention.

[0028] Figure 7 This is a frontal cross-sectional view of the present invention after removing the rubber half-ring and the colloid.

[0029] Figure 8 yes Figure 6 Enlarged diagram of point A in the middle.

[0030] Figure 9 yes Figure 6 Enlarged diagram of point B in the middle.

[0031] Reference numerals: 1. Cable body; 2. Inner sealing mechanism; 3. Intermediate buffer mechanism; 4. Outer protective mechanism; 21. Sealing cylinder; 22. Locking element; 23. Ventilation assembly; 31. Rubber semi-ring; 32. Protective membrane; 41. Positioning cover; 42. Protective inner cylinder; 43. Connecting assembly; 44. Drive assembly; 211. Sealing semi-ring; 212. Positioning protrusion; 231. Ventilation opening; 232. Control element; 233. Filter screen; 234. Valve plate; 235. Moving plate; 411. Positioning semi-ring; 412. Positioning groove; 413. Alternating groove; 421. Protective semi-ring; 422. Glue injection cavity; 423. Limiting groove; 424. Mounting protrusion; 431. Connecting semi-ring; 432. Insert rod; 441. Sliding groove; 442. Slider; 443. Drive plate; 444. Connecting rod. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] See Figure 1 , Figure 2 , Figure 4 and Figure 6 A polyvinyl chloride cable includes a cable body 1, and there are two cable bodies 1. The two cable bodies 1 are connected by a wiring unit. The wiring unit adopts existing technology. Specifically, it can be connected by wiring terminals or by winding the copper cores of the two cable bodies 1 together and then fixing them with heat shrink tubing. A protective unit is also provided between the two cable bodies 1. The protective unit includes an inner sealing mechanism 2, an intermediate buffer mechanism 3 and an outer protective mechanism 4.

[0034] See Figure 1 and Figure 7The inner sealing mechanism 2 includes a sealing cylinder 21, which is fixed to the cable body 1 by a locking member 22, and a ventilation component 23 is provided on the sealing cylinder 21.

[0035] See Figure 1 , Figure 2 , Figure 4 and Figure 7 The outer protective mechanism 4 includes a positioning cover 41 and a protective inner cylinder 42. There are two positioning cover 41 and two protective inner cylinders 42, which are horizontally symmetrically distributed on both sides of the cable body 1. The protective inner cylinder 42 and the inner side of the positioning cover 41 are in horizontal sliding contact. The two positioning cover 41 are connected by a connecting component 43. The connecting component 43 is provided with a driving component 44 that drives the protective inner cylinder 42 to move horizontally.

[0036] When the ambient temperature is low, the inner sealing mechanism 2, the intermediate buffer mechanism 3 and the outer protective mechanism 4 together form a triple protection structure; when the ambient temperature is high, the drive component 44 drives the protective inner cylinder 42 to separate, forming a ventilation gap, and at the same time the ventilation component 23 is turned on to accelerate the discharge of heat generated during cable operation.

[0037] See Figure 1 and Figure 2 The sealing cylinder 21 is composed of two symmetrical sealing half cylinders 211, the positioning cover cylinder 41 is composed of two symmetrical positioning half cylinders 411, and the protective inner cylinder 42 is composed of two symmetrical protective half cylinders 421. Sealing gaskets are provided on the opposite surfaces of the two sealing half cylinders 211, the opposite surfaces of the two positioning half cylinders 411, and the opposite surfaces of the two protective half cylinders 421 to ensure the sealing of the assembled cylinder.

[0038] See Figure 6 and Figure 7 The locking element 22 is an internal threaded sleeve with a conical structure inside. The end of the sealing cylinder 21 is also conical. There are two internal threaded sleeves, which correspond to the two ends of the sealing cylinder 21 respectively. The cable body 1 is provided with an external thread corresponding to the locking element 22. The internal threaded sleeve is threadedly connected to the cable body 1. When the internal threaded sleeve is tightened on the cable body 1, the inner wall of the internal threaded sleeve fits against the end of the sealing cylinder 21, thereby locking and sealing the sealing cylinder 21 and providing reliable protection for the cable body 1 joint. To improve the sealing effect, a sealing gasket (not shown in the figure) can be provided on the contact surface between the internal threaded sleeve and the sealing cylinder 21.

[0039] See Figure 2 , Figure 5 and Figure 7The sealing half-cylinder 211 has a positioning protrusion 212 on its side wall, and two horizontally symmetrical positioning half-cylinders 411 have positioning grooves 412 on their opposite sides. The protective half-cylinder 421 has an injection cavity 422 inside, and an injection port on the protective half-cylinder 421 that communicates with the injection cavity 422. Adhesive liquid is injected into the injection cavity 422 through the injection port. Specifically, polyurethane potting adhesive can be used. After the adhesive solidifies, it forms a protective layer with a certain elasticity, which can provide reliable heat preservation, pressure resistance, weather resistance and other protective functions for the cable body 1. The positioning half-cylinder 411 has a clearance groove 413 for avoiding the injection port.

[0040] See Figure 6 and Figure 7 The number of intermediate buffer mechanisms 3 is two, and the two intermediate buffer mechanisms 3 are horizontally symmetrically distributed on both sides of the cable body 1 at the joint. The intermediate buffer mechanism 3 includes two rubber semi-rings 31 that are symmetrically arranged vertically. Specifically, EPDM rubber material can be selected, which can play a good buffering role and absorb the stress generated by the thermal expansion and contraction of the colloid. Its specific thickness can be selected according to the actual application environment temperature or pressure resistance requirements of the cable. The inner wall of the protective semi-cylinder 421 is provided with a limiting groove 423 for installing the rubber semi-rings 31.

[0041] Before connecting the two cable bodies 1, two internal threaded sleeves are respectively fitted onto the outside of the corresponding cable bodies 1. Then, the two cable bodies 1 are connected through the wiring unit. After the connection is completed, the upper and lower sealing half cylinders 211 are respectively covered on the upper and lower sides of the cable bodies 1, so that the connection point of the two cable bodies 1 is completely located inside the sealing cylinder 21 formed by the two sealing half cylinders 211. Then, the rubber half ring 31 is placed outside the sealing half cylinder 211, and the protective half cylinder 421 is placed outside the sealing half cylinder 211, and the rubber half ring 31 is inserted into the limiting groove 423. Subsequently, the positioning half cylinder 411 is placed outside the sealing half cylinder 211, and the multiple positioning half cylinders 411 are locked and fixed through the connecting component 43, thereby indirectly realizing the fixation of the sealing cylinder 21 and the protective cylinder.

[0042] See Figure 1 , Figure 3 and Figure 8 The connecting component 43 includes two symmetrical connecting half-rings 431, which are detachably connected. Specifically, bolt connection, snap-fit ​​connection, or other methods can be used. The arc-shaped sidewall of the connecting half-ring 431 is evenly provided with multiple strip-shaped through holes, so that the heat and moisture generated by the cable body 1 during operation can be dissipated through the strip-shaped through holes after the horizontally symmetrical protective half-cylinder 421 is separated. The connecting half-ring 431 has semi-ring grooves on both sides distributed along its width direction. The horizontal sidewall of the semi-ring groove is provided with a plug rod 432. The opposite ends of the horizontally symmetrical positioning half-cylinder 411 are provided with insertion holes.

[0043] After placing the protective half-cylinder 421 outside the sealing half-cylinder 211, place the positioning half-cylinder 411 outside the sealing cylinder 21, so that the positioning half-cylinder 411 covers the outside of the protective half-cylinder 421 and the positioning groove 412 fits with the positioning protrusion 212 to position one side of the positioning half-cylinder 411. After all the positioning half-cylinders 411 are placed, place the connecting half-ring 431 between the two horizontally symmetrical positioning half-cylinders 411, so that the insertion rod 432 is inserted into the insertion hole, and the positioning half-cylinder 411 is positioned in conjunction with the positioning protrusion 212. Finally, connect and fix the two connecting half-rings 431.

[0044] See Figure 7 and Figure 8 The drive assembly 44 includes a plurality of sliding grooves 441 evenly opened on the inner side of the connecting semi-ring 431. The sliding grooves 441 and the strip-shaped through holes are distributed alternately. A slider 442 is slidably installed in the sliding groove 441. A bimetallic drive plate 443 is connected between the slider 442 and the sliding groove 441.

[0045] See Figure 6 and Figure 8 Two horizontally symmetrical protective half cylinders 421 are provided with mounting protrusions 424 on opposite sides. A reset spring is connected between the mounting protrusions 424 and the sliding groove 441 to assist the protective half cylinders 421 in reversing and resetting. The sliders 442 located directly above and below are provided with docking rods 444 on the side near the protective half cylinders 421. The protective half cylinders 421 are provided with docking holes corresponding to the positions of the docking rods 444.

[0046] After the positioning half-ring is installed, the docking rod 444 extends into the corresponding docking hole so that when the temperature changes, the sliding block 442 is moved by the drive plate 443, and the protective half-cylinder 421 is simultaneously moved in the positioning half-cylinder 411. At the same time as the protective half-cylinder 421 moves, the rubber half-ring 31 that is locked in the limiting groove 423 also moves.

[0047] See Figure 5 , Figure 7 and Figure 9 The ventilation assembly 23 includes a ventilation opening 231 and a control component 232 for controlling the opening and closing of the ventilation opening 231. The ventilation opening 231 is located on the side wall of the sealed cylinder 21 where it is not blocked by the intermediate buffer mechanism 3 and the outer protective mechanism 4. The number of ventilation openings 231 is determined according to actual needs. The control component 232 is installed inside the sealed cylinder 21. A filter screen 233 is detachably installed inside the ventilation opening 231 to prevent dust and other substances from entering. To further improve the protective effect, an ePTFE membrane (not shown in the figure) can also be detachably installed inside the filter screen 233 of the ventilation opening 231 to block moisture intrusion.

[0048] See Figure 9The control component 232 includes a valve plate 234 horizontally installed on the inner wall of the sealed cylinder 21 and a movable plate 235 fixedly installed on the inner wall of the closed cylinder. The movable plate 235 is made of bimetallic strip material. A connecting hole is provided on the valve plate 234. The valve plate 234 and the movable plate 235 are fixedly connected.

[0049] Both the movable plate 235 and the drive plate 443 are bimetallic sheets. The bimetallic sheet is a robust composite of two metal materials with significantly different coefficients of thermal expansion. It undergoes directional bending deformation when the temperature changes, and outputs mechanical driving force. Specifically, a manganese-copper-nickel bimetallic sheet or a highly fatigue-resistant iron-nickel-chromium bimetallic sheet can be used. Rigid limiting blocks (not shown in the figure) can be added at the deformation points of the drive plate 443 and the movable plate 235 to limit the maximum deformation of the bimetallic sheet and prevent permanent deformation caused by excessive bending.

[0050] When the ambient temperature is higher than the high temperature threshold (e.g., 35℃~45℃), the moving plate 235 is heated and bends to the side with a smaller coefficient of expansion. The tension generated by the bending drives the valve plate 234 to move, so that the connecting hole corresponds to the vent 231. The vent 231 is fully opened, realizing the discharge of hot air inside the sealed cylinder 21 and allowing cold air from the outside to enter, thus enhancing the heat dissipation effect.

[0051] When the ambient temperature is below the low temperature threshold (e.g., 0℃~5℃), the moving plate 235 cools and rebounds, returning to a flat state, which drives the valve plate 234 to move in the opposite direction, so that the connecting hole and the vent 231 are completely misaligned, the vent 231 is completely closed, and the airflow exchange between the inside and outside of the sealed cylinder 21 is cut off, so as to achieve internal heat preservation, waterproofing and dustproofing.

[0052] When the temperature is between the high and low thresholds, the moving plate 235 bends to a moderate degree, and the connecting hole and the vent 231 are partially connected. The vent 231 is in a slightly open state, so as to achieve gentle heat dissipation and dehumidification without affecting the overall protection.

[0053] Similarly, when the ambient temperature is higher than the high temperature threshold, the gap between the horizontally symmetrical protective half-cylinders 421 is at its maximum, which is conducive to the dissipation of heat. When the ambient temperature is lower than the low temperature threshold, the horizontally symmetrical protective half-cylinders 421 are completely closed, which plays a good role in heat preservation. When the temperature is between the high and low thresholds, the horizontally symmetrical protective half-cylinders 421 are in a slightly open state, which achieves gentle heat dissipation and dehumidification.

[0054] In summary, since the deformation of the bimetallic strip corresponds continuously and stably with temperature, the vent 231 can achieve adaptive adjustment of being fully closed, slightly open, and fully open without the need for power control or manual operation.

[0055] It should be noted that an outlet (not shown in the figure) can be opened on the unshielded part of the lower side of the sealing cylinder 21. The outlet can be sealed with a sealing plug. The sealing plug can be removed periodically to drain the internal condensate and clean the accumulated dust, so as to avoid the accumulation of water vapor and dust affecting the performance of the cable body 1.

[0056] Furthermore, the core components of this invention are all modular structures, requiring no complex processing. During installation, each half-tube is simply assembled onto the cable body 1 and fixed by the connecting component 43 and locking component 22. During maintenance, the connecting component 43 and locking component 22 are simply disassembled to open the protective unit for inspection, without damaging the adhesive and protective components. Compared with the destructive repair of existing glue boxes and the rewinding of heat shrink tubing or tape, this invention significantly reduces the difficulty of on-site installation and maintenance, and improves work efficiency.

[0057] See Figure 6 , Figure 7 and Figure 8 The limiting grooves 423 on the two horizontally symmetrically distributed protective semi-cylinders 421 are connected to each other on opposite sides. A protective membrane 32 made of ePTFE material is provided between the two horizontally symmetrically distributed rubber semi-rings 31. Specifically, the protective membrane 32 can be installed by screws or clamps. The upper and lower symmetrical protective membranes 32 form a ring structure.

[0058] When the ambient temperature exceeds the high-temperature threshold, the gap between the horizontally symmetrical protective half-cylinders 421 is at its maximum, simultaneously causing the protective membrane 32 to open. When the ambient temperature falls below the low-temperature threshold, the protective membrane 32 closes. When the temperature is between the high and low thresholds, the protective membrane 32 remains slightly open. The protective membrane 32 allows heat and moisture to escape while preventing dust and rainwater from entering. The protective membrane 32 can be inspected periodically, and should be replaced promptly if damaged.

[0059] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0060] In the description of this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0061] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0062] The above provides a detailed description of a polyvinyl chloride cable provided by the present invention. For those skilled in the art, based on the ideas of the embodiments of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A polyvinyl chloride cable, comprising two cable bodies connected by a wiring unit, characterized in that: A protective unit is also installed between the two cable bodies; The protective unit includes an inner sealing mechanism, an intermediate buffer mechanism, and an outer protective mechanism. The inner sealing mechanism includes a sealing cylinder, which is fixed to the cable body by a locking member, and a ventilation component is provided on the sealing cylinder; The outer protective mechanism includes a positioning cover and a protective inner cylinder. There are two positioning covers and two protective inner cylinders, which are horizontally symmetrically distributed on both sides of the cable body docking point. The inner protective cylinder and the inner side of the positioning cover are in horizontal sliding contact. The two positioning covers are connected by a connecting component. The connecting component is equipped with a drive component that drives the protective inner cylinder to move horizontally. When the ambient temperature is low, the inner sealing mechanism, the intermediate buffer mechanism and the outer protective mechanism together form a triple protection structure; when the ambient temperature is high, the drive component drives the protective inner cylinder to separate, forming a ventilation gap, and at the same time the ventilation component is turned on to accelerate the discharge of heat generated during cable operation.

2. The polyvinyl chloride cable according to claim 1, characterized in that, The sealing cylinder is composed of two symmetrical sealing half-cylinders, the positioning cover is composed of two symmetrical positioning half-cylinders, and the protective inner cylinder is composed of two symmetrical protective half-cylinders. The sealing half-cylinder has a positioning protrusion on its side wall, and two horizontally symmetrical positioning half-cylinders have positioning grooves on their opposite sides. The protective half-cylinder has an injection cavity inside, and an injection port on the protective half-cylinder that communicates with the injection cavity. Adhesive is injected into the injection cavity through the injection port. The positioning half-cylinder has a clearance groove to avoid the injection port.

3. A polyvinyl chloride cable according to claim 2, characterized in that, Sealing gaskets are provided on the opposing surfaces of the two sealing half-cylinders, the opposing surfaces of the two positioning half-cylinders, and the opposing surfaces of the two protective half-cylinders.

4. A polyvinyl chloride cable according to claim 2, characterized in that, The number of intermediate buffer mechanisms is two, and the two intermediate buffer mechanisms are horizontally symmetrically distributed on both sides of the cable body connection. The intermediate buffer mechanism includes two rubber semi-rings symmetrically arranged vertically. The inner wall of the protective semi-cylinder is provided with a limiting groove for installing the rubber semi-rings.

5. A polyvinyl chloride cable according to claim 1, characterized in that, The ventilation assembly includes a ventilation opening and a control component for controlling the opening and closing of the ventilation opening. The ventilation opening is located on the side wall of the sealed cylinder, the control component is installed inside the sealed cylinder, and a filter screen is provided inside the ventilation opening.

6. A polyvinyl chloride cable according to claim 2, characterized in that, The connecting assembly includes two symmetrical connecting half-rings, which are detachably connected. The arc-shaped sidewalls of the connecting half-rings are evenly provided with multiple strip-shaped through holes. The two sides of the connecting half-rings are provided with half-ring grooves along their width direction. The horizontal sidewalls of the half-ring grooves are provided with insert rods. The opposite ends of the horizontally symmetrical positioning half-cylinders are provided with insertion holes.

7. A polyvinyl chloride cable according to claim 6, characterized in that, The drive assembly includes multiple sliding grooves evenly opened on the inner side of the connecting semi-ring, the sliding grooves and strip-shaped through holes are distributed alternately, a slider is slidably installed in the sliding groove, and a bimetallic drive plate is connected between the slider and the sliding groove. Two horizontally symmetrical protective half-cylinders are provided with mounting protrusions on opposite sides, and a return spring is connected between the mounting protrusions and the sliding groove; the sliders located directly above and below are provided with docking rods on the side near the protective half-cylinders, and docking holes corresponding to the positions of the docking rods are opened on the protective half-cylinders.

8. A polyvinyl chloride cable according to claim 5, characterized in that, The control component includes a valve plate horizontally installed on the inner wall of the sealed cylinder and a movable plate fixedly installed on the inner wall of the closed cylinder. The movable plate is made of bimetallic strip material, and the valve plate has a connecting hole. The valve plate and the movable plate are fixedly connected.

9. A polyvinyl chloride cable according to claim 2, characterized in that, The locking component is an internal threaded sleeve with a conical internal structure and a conical end of the sealing cylinder. There are two internal threaded sleeves, each corresponding to one end of the sealing cylinder. The internal threaded sleeve is threadedly connected to the cable body. When the internal threaded sleeve is tightened on the cable body, the inner wall of the internal threaded sleeve fits against the end of the sealing cylinder.

10. A polyvinyl chloride cable according to claim 4, characterized in that, The limiting grooves on the two horizontally symmetrically distributed protective semi-cylinders are connected to each other on opposite sides. An ePTFE protective membrane is provided between the two horizontally symmetrically distributed rubber semi-rings, and the upper and lower symmetrical protective membranes form a ring structure.

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