Polyvinyl chloride cable

Abstract

The invention relates to the technical field of cables, in particular to a polyvinyl chloride cable which comprises two cable bodies, the number of the cable bodies is two, the two cable bodies are connected through a wiring unit, a protection unit is further arranged between the two cable bodies, and the protection unit comprises an inner layer sealing mechanism, a middle buffering mechanism and an outer layer protection mechanism. By designing a triple protection structure in which inner layer sealing, middle buffering and outer layer protection are coordinated, closed heat preservation or ventilation heat dissipation can be automatically completed according to the environment temperature, and a short polyvinyl chloride material plate which is poor in heat resistance and prone to embrittlement at the low temperature is accurately adapted; and meanwhile, the protection unit adopts a vertically symmetrical detachable split structure, so that the limitation of permanent sealing after the traditional glue filling protection is cured is broken, the glue does not need to be damaged during maintenance, the protection part can be repeatedly utilized, and the maintenance operation difficulty and cost are greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to a polyvinyl chloride cable. BACKGROUND

[0002] The polyvinyl chloride cable is a cable device for signal transmission, the insulating material is polyvinyl chloride, and the conductor material is mainly copper and aluminum, which is widely used in the field of construction. In actual operation, it is often necessary to connect multiple cables for use. Polyvinyl chloride has poor heat resistance, and is prone to hardening, brittleness, and a sharp decrease in bending resistance / impact resistance in low-temperature environments. The connection is a relatively weak and vulnerable part of the entire cable, and it is necessary to provide protection.

[0003] Common protection methods include electrician tape winding connection, heat shrink tube wrapping connection, and glue-filled junction box connection. Among them, the glue-filled junction box uses a completely sealed, insulated, and shockproof solid protective layer formed by the two-component resin poured into the sealed box after curing to provide protection. Compared with other protection methods, it has superior mechanical and electrical protection performance and is suitable for connecting and protecting cables in harsh environments or critical locations. However, once the glue is cured, the connection is permanently sealed. If maintenance or replacement of the joint is required, the glue must be completely destroyed, which is very difficult to operate, and often requires replacement of the entire junction box and re-creation of the joint, resulting in high maintenance costs.

[0004] In addition, the glue has poor thermal conductivity, which can provide good thermal protection in winter low-temperature environments, but in summer high-temperature environments, the heat at the cable connection cannot be dissipated, and the heat continues to accumulate, accelerating the aging, softening, and thermal deformation of the cable, leading to a decrease in insulation performance, an increase in the risk of electrical leakage and breakdown, and a series of safety hazards. SUMMARY

[0005] Therefore, the present application aims to provide a polyvinyl chloride cable to solve the technical problems existing in the prior art. The polyvinyl chloride cable comprises a cable main body, the number of cable main bodies is two, two cable main bodies are connected through a junction unit, and a protection unit is further arranged between the two cable main bodies.

[0006] The protection unit comprises an inner sealing mechanism, an intermediate buffering mechanism, and an outer protection mechanism.

[0007] The inner sealing mechanism comprises a sealing cylinder, the sealing cylinder is fixed to the cable main body by a locking piece, and a ventilation assembly is arranged on the sealing cylinder.

[0008] The outer protection mechanism comprises positioning cover cylinders and protection inner cylinders, two of each of which are horizontally and symmetrically distributed on both sides of the cable main body butt joint, the protection inner cylinders and the positioning cover cylinders are horizontally slidingly contacted, two positioning cover cylinders are connected through a connecting assembly, and the connecting assembly is provided with a driving assembly for driving the protection inner cylinders to horizontally move.

[0009] Preferably, the sealing cylinder body is composed of two sealing half cylinders which are symmetrically arranged in upper and lower positions, the positioning cover cylinder is composed of two positioning half cylinders which are symmetrically arranged in upper and lower positions, and the protection inner cylinder is composed of two protection half cylinders which are symmetrically arranged in upper and lower positions.

[0010] The sealing half cylinder side wall is provided with a positioning convex edge, horizontally symmetrically arranged two positioning half cylinders are provided with positioning grooves on opposite sides, the protection half cylinder is provided with a glue injection cavity in the inside, the protection half cylinder is provided with a glue injection port which is in communication with the glue injection cavity, the glue injection cavity is filled with glue liquid through the glue injection port, and the positioning half cylinder is provided with an avoidance slot for avoiding the glue injection port.

[0011] Preferably, the opposite surfaces of the two sealing half cylinders, the opposite surfaces of the two positioning half cylinders and the opposite surfaces of the two protection half cylinders are all provided with sealing gaskets.

[0012] Preferably, the number of the intermediate buffering mechanisms is two, and the two intermediate buffering mechanisms are horizontally and symmetrically distributed on both sides of the cable main body butt joint, the intermediate buffering mechanism comprises two rubber half rings which are symmetrically arranged in upper and lower positions; and the inner wall of the protection half cylinder is provided with a limiting slot for mounting the rubber half ring.

[0013] Preferably, the ventilation assembly comprises a ventilation port and a control piece for controlling the opening and closing state of the ventilation port, the ventilation port is arranged on the side wall of the sealing cylinder body, the control piece is mounted in the inside of the sealing cylinder body, and a filter screen is mounted in the ventilation port.

[0014] Preferably, the connecting assembly comprises two connecting half rings which are symmetrically arranged in upper and lower positions, the two connecting half rings are detachably connected, the arc-shaped side walls of the connecting half rings are uniformly provided with a plurality of strip-shaped through holes, the two sides of the connecting half ring distributed along the width direction are provided with half ring grooves, the horizontal side walls of the half ring grooves are provided with insertion rods, and the opposite ends of the horizontally symmetric positioning half cylinders are provided with insertion holes.

[0015] Preferably, the driving assembly comprises a plurality of sliding grooves which are uniformly arranged in the inside of the connecting half ring, the sliding grooves and the strip-shaped through holes are alternately distributed, a sliding block is slidingly mounted in the sliding groove, and a driving plate made of bimetallic sheet is connected between the sliding block and the sliding groove.

[0016] The opposite sides of the two horizontally symmetric protection half cylinders are provided with mounting convex edges, the mounting convex edges and the sliding grooves are connected with return springs; the side of the sliding block close to the protection half cylinder in the directly upper position and the directly lower position is provided with a butt joint rod, and the protection half cylinder is provided with a butt joint hole which is in position correspondence with the butt joint rod.

[0017] Preferably, the control member comprises a valve plate horizontally mounted on the inner wall of the sealing cylinder and a moving plate fixedly mounted on the inner wall of the sealing cylinder, the moving plate is made of bimetal sheet, the valve plate is provided with a communication hole, and the valve plate is fixedly connected with the moving plate.

[0018] Preferably, the locking member is an internally threaded sleeve, the internally threaded sleeve is internally tapered, the sealing cylinder is tapered at the end, the number of the internally threaded sleeves is two and each corresponds to one end of the sealing cylinder, and the internally threaded sleeves are threadedly connected with the cable body, when the internally threaded sleeves are screwed on the cable body, the inner wall of the internally threaded sleeves is attached to the end of the sealing cylinder.

[0019] Preferably, the limiting grooves on the two horizontally symmetrically distributed protective half cylinders are communicated with each other at opposite sides, a protective film is arranged between the two horizontally symmetrically distributed rubber half rings, and the upper and lower symmetric protective films form an annular structure.

[0020] It can be seen from the above technical solutions that the polyvinyl chloride cable designed by the application has the following beneficial effects: the three protective structures of inner sealing, intermediate buffering and outer protection are designed to cooperate, and the closed heat preservation or ventilation and heat dissipation can be automatically completed according to the environmental temperature, and the poor heat resistance and brittle fracture of the polyvinyl chloride material at low temperature are accurately adapted; at the same time, the upper and lower symmetric detachable split structure is adopted, which breaks the limitation of permanent storage after traditional glue filling protection and solidification, and the maintenance operation difficulty and cost are greatly reduced without damaging the glue body during maintenance, and the protective components can be reused; the whole regulation process does not need external power supply and manual intervention, and is suitable for no power supply scenes such as outdoor and remote construction sites, and the split structure also has the characteristics of convenient installation and accurate positioning, and the overall protection performance, environmental adaptability, installation and maintenance performance and use safety are improved in many aspects, and the pain points of the existing polyvinyl chloride cable butt joint protection mode are effectively solved, and the service life of the cable is significantly prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0021] The application will be further described below in combination with the drawings and examples.

[0022] Figure 1 is a perspective view of the application.

[0023] Figure 2 is a perspective view of the application after removing the positioning cover cylinder.

[0024] Figure 3 is a front view of the application.

[0025] Figure 4 is a side view of the application.

[0026] Figure 5 is a perspective view of the cable body and the inner sealing mechanism.

[0027] Figure 6 is a front view of the present application.

[0028] Figure 7 is a front view of the present application after removing the rubber half ring and glue.

[0029] Figure 8 is Figure 6 is an enlarged view of A in FIG.

[0030] Figure 9 is Figure 6 is an enlarged view of B in FIG.

[0031] Reference signs: 1, cable body; 2, inner sealing mechanism; 3, intermediate buffering mechanism; 4, outer protective mechanism; 21, sealing cylinder; 22, locking piece; 23, ventilation assembly; 31, rubber half ring; 32, protective film; 41, positioning cover cylinder; 42, protective inner cylinder; 43, connecting assembly; 44, driving assembly; 211, sealing half cylinder; 212, positioning convex edge; 231, ventilation opening; 232, control piece; 233, filter screen; 234, valve plate; 235, moving plate; 411, positioning half cylinder; 412, positioning groove; 413, avoidance groove; 421, protective half cylinder; 422, glue injection cavity; 423, limiting groove; 424, mounting convex edge; 431, connecting half ring; 432, insertion rod; 441, sliding groove; 442, sliding block; 443, driving plate; 444, butt joint rod. DETAILED DESCRIPTION

[0032] In order to make the personnel in the technical field better understand the present application scheme, the present application is further described in detail below in combination with the drawings and specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0033] Referring to Figure 1 , Figure 2 , Figure 4 and Figure 6 , a polyvinyl chloride cable comprises two cable bodies 1, the two cable bodies 1 are connected through a wiring unit, the wiring unit adopts the prior art, specifically, the two cable bodies 1 can be connected through wiring terminals or the copper cores of the two cable bodies 1 are wound and connected and then fixed through a heat shrink tube, and a protective unit is further arranged between the two cable bodies 1; the protective unit comprises an inner sealing mechanism 2, an intermediate buffering mechanism 3 and an outer protective mechanism 4.

[0034] Referring to Figure 1 and Figure 7The inner layer sealing mechanism 2 comprises a sealing cylinder 21 fixed on the cable body 1 by a locking member 22, and a ventilation assembly 23 is arranged on the sealing cylinder 21.

[0035] Referring to Figure 1 , Figure 2 , Figure 4 and Figure 7 The outer layer protection mechanism 4 comprises two positioning cover cylinders 41 and two protection inner cylinders 42, which are horizontally symmetrically distributed on both sides of the cable body 1, and the protection inner cylinders 42 and the positioning cover cylinders 41 are in horizontal sliding contact, the two positioning cover cylinders 41 are connected by a connecting assembly 43, and the connecting assembly 43 is provided with a driving assembly 44 for driving the protection inner cylinders 42 to move horizontally.

[0036] When the ambient temperature is low, the inner layer sealing mechanism 2, the intermediate buffer mechanism 3 and the outer layer protection mechanism 4 jointly form a triple protection structure; when the ambient temperature is high, the driving assembly 44 drives the protection inner cylinders 42 to separate, forming a ventilation gap, and at the same time, the ventilation assembly 23 is opened to accelerate the heat generated during the cable operation.

[0037] Referring to Figure 1 and Figure 2 The sealing cylinder 21 is composed of two sealing half cylinders 211 which are symmetrically arranged above and below, the positioning cover cylinder 41 is composed of two positioning half cylinders 411 which are symmetrically arranged above and below, and the protection inner cylinder 42 is composed of two protection half cylinders 421 which are symmetrically arranged above and below; 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 protection half cylinders 421 are all provided with sealing gaskets to ensure the sealing performance of the cylinder formed by splicing.

[0038] Referring to Figure 6 and Figure 7 The locking member 22 is an internal thread sleeve, the inside of the internal thread sleeve is a conical structure, the end of the sealing cylinder 21 is a conical structure, the number of the internal thread sleeves is two and they correspond to the two ends of the sealing cylinder 21 respectively, the cable body 1 is provided with external threads corresponding to the locking member 22, the internal thread sleeve is threadedly connected with the cable body 1, when the internal thread sleeve is screwed on the cable body 1, the inner wall of the internal thread sleeve is in close contact with the end of the sealing cylinder 21, so as to lock and seal the sealing cylinder 21, thereby providing reliable protection for the butt joint of the cable body 1, in order to improve the sealing effect, sealing gaskets (not shown in the figure) can be arranged on the contact surface between the internal thread sleeve and the sealing cylinder 21.

[0039] Referring to Figure 2 , Figure 5 and Figure 7The sealing half cylinder 211 is provided with a positioning convex edge 212, horizontally symmetrical two positioning half cylinders 411 are provided with positioning grooves 412 on the opposite sides, and the protective half cylinder 421 is internally provided with a glue injection cavity 422. The protective half cylinder 421 is provided with a glue injection port in communication with the glue injection cavity 422. Glue is injected into the glue injection cavity 422 through the glue injection port. Specifically, polyurethane pouring sealant can be selected. After the glue solidifies, a protective layer with a certain elasticity is formed, which can provide reliable protection functions such as heat preservation, pressure resistance and weather resistance for the cable body 1. The positioning half cylinder 411 is provided with an avoidance slot 413 for avoiding the glue injection port.

[0040] Referring to Figure 6 and Figure 7 , the number of the intermediate buffering mechanisms 3 is two, and the two intermediate buffering mechanisms 3 are horizontally symmetrically distributed on both sides of the cable body 1 at the butt joint. The intermediate buffering mechanism 3 comprises two rubber half rings 31 symmetrically arranged above and below. Specifically, the three-element ethylene-propylene rubber material can be selected, which can play a good buffering effect and absorb the stress generated by the thermal expansion and contraction of the glue. The specific thickness can be selected according to the actual application environment temperature or pressure resistance requirement of the cable. The inner wall of the protective half cylinder 421 is provided with a limiting groove 423 for mounting the rubber half ring 31.

[0041] Before the butt joint of the two cable bodies 1, the two internal threaded sleeves are respectively sleeved on the outer sides of the corresponding cable bodies 1. Then, the two cable bodies 1 are butt jointed through the wiring unit. After the butt joint is completed, the upper and lower sealing half cylinders 211 are respectively covered on the upper and lower sides of the cable body 1, so that the butt joint of the two cable bodies 1 is completely located inside the sealing cylinder 21 composed of 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 clamped into the limiting groove 423. Then, 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 assembly 43, thereby indirectly realizing the fixation of the sealing cylinder 21 and the protective cylinder.

[0042] Referring to Figure 1 , Figure 3 and Figure 8 , the connecting assembly 43 comprises two connecting half rings 431 symmetrically arranged above and below. The two connecting half rings 431 are detachably connected. Specifically, bolt connection, buckle connection and the like can be selected. The arc-shaped side walls of the connecting half rings 431 are uniformly provided with a plurality of strip-shaped through holes, so that the heat and water vapor generated during the operation of the cable body 1 can be dissipated from the strip-shaped through holes after the horizontally symmetrical protective half cylinder 421 is separated. The two sides of the connecting half ring 431 distributed along the width direction are provided with a half ring groove, and the horizontal side wall of the half ring groove is provided with a plug rod 432. The opposite ends of the horizontally symmetrical positioning half cylinder 411 are provided with a plug hole.

[0043] After placing the protection 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 protection half cylinder 421, and the positioning groove 412 is attached to the positioning convex edge 212. Position one side of the positioning half cylinder 411, and place all the positioning half cylinders 411, then 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 cooperation with the positioning convex edge 212, and finally the two connecting half rings 431 are connected and fixed.

[0044] Referring to Figure 7 and Figure 8 , the driving assembly 44 includes a plurality of sliding grooves 441 uniformly provided inside the connecting half ring 431, the sliding grooves 441 are arranged alternately with the strip-shaped through holes, and a sliding block 442 is slidingly installed in the sliding groove 441. The sliding block 442 is connected with the driving plate 443 made of bimetallic sheet between the sliding groove 441.

[0045] Referring to Figure 6 and Figure 8 , the opposite sides of the two horizontally symmetrical protection half cylinders 421 are provided with mounting convex edges 424, and the mounting convex edges 424 are connected with the reset springs between the sliding grooves 441, so as to assist the reverse reset of the protection half cylinder 421; the side of the sliding block 442 close to the protection half cylinder 421 is provided with a butt joint rod 444, and the protection half cylinder 421 is provided with a butt joint hole corresponding to the position of the butt joint rod 444.

[0046] After the positioning half ring is installed, the butt joint rod 444 extends into the corresponding butt joint hole, so that when the temperature changes, the protection half cylinder 421 is simultaneously sliding in the positioning half cylinder 411 through the process of driving the sliding block 442 to move by the driving plate 443, and the rubber half ring 31 clamped in the limiting groove 423 also moves at the same time.

[0047] Referring to Figure 5 , Figure 7 and Figure 9 , the ventilation assembly 23 includes a ventilation port 231 and a control member 232 for controlling the opening and closing state of the ventilation port 231, the ventilation port 231 is provided on the side wall of the sealing cylinder 21 which is not blocked by the intermediate buffer mechanism 3 and the outer protection mechanism 4, the number of ventilation ports 231 is determined according to actual needs, the control member 232 is installed inside the sealing cylinder 21, and a filter screen 233 is detachably installed in the ventilation port 231, so as to prevent dust and the like from entering. In order to further improve the protection effect, an ePTFE film (not shown in the figure) can be detachably installed inside the filter screen 233 of the ventilation port 231 to block the intrusion of moisture.

[0048] Referring to Figure 9The control member 232 comprises a valve plate 234 horizontally mounted on the inner wall of the sealing cylinder 21 and a moving plate 235 fixedly mounted on the inner wall of the sealing cylinder, the moving plate 235 being made of bimetal sheet, and the valve plate 234 is provided with a communication hole, and the valve plate 234 is fixedly connected with the moving plate 235.

[0049] The moving plate 235 and the driving plate 443 are both bimetal sheets, the bimetal sheet is firmly composed of two metal materials with different thermal expansion coefficients, and generates directional bending deformation when the temperature changes, and outputs mechanical driving force. Specifically, a manganese-copper-nickel bimetal sheet or a high fatigue-resistant iron-nickel-chromium bimetal sheet can be selected, and a rigid limiting block (not shown in the figure) can be added at the deformation position of the driving plate 443 and the moving plate 235 to limit the maximum deformation amount of the bimetal sheet, so as to avoid permanent deformation caused by excessive bending.

[0050] When the ambient temperature is higher than the high temperature threshold (such as 35-45℃), the moving plate 235 is heated and bends to the side with a smaller expansion coefficient, the tension generated by the bending drives the valve plate 234 to move, so that the communication hole is opposite to the ventilation opening 231, the ventilation opening 231 is completely opened, the hot air in the sealing cylinder 21 is discharged, and the external cold air enters to enhance the heat dissipation effect.

[0051] When the ambient temperature is lower than the low temperature threshold (such as 0-5℃), the moving plate 235 cools and rebounds to return to a flat state, and drives the valve plate 234 to move reversely, so that the communication hole is completely deviated from the ventilation opening 231, the ventilation opening 231 is completely closed, the air exchange between the inside and outside of the sealing cylinder 21 is cut off, and internal heat preservation, waterproof and dustproof are realized.

[0052] When the temperature is between the high and low thresholds, the moving plate 235 generates moderate bending, the communication hole is partially communicated with the ventilation opening 231, and the ventilation opening 231 is in a slightly open state, so that moderate heat dissipation and dehumidification are realized without affecting the overall protection.

[0053] Similarly, when the ambient temperature is higher than the high temperature threshold, the gap between the horizontally symmetrical protection half-cylinders 421 is the largest, which is beneficial to heat dissipation, when the ambient temperature is lower than the low temperature threshold, the horizontally symmetrical protection half-cylinders 421 are completely closed, and good heat preservation is realized, and when the temperature is between the high and low thresholds, the horizontally symmetrical protection half-cylinders 421 are in a slightly open state, and moderate heat dissipation and dehumidification are realized.

[0054] In summary, since the deformation degree of the bimetal sheet is continuously and stably corresponding to the temperature, the ventilation opening 231 can realize self-adaptive adjustment of full closing, slightly opening and fully opening, without power supply control and manual operation.

[0055] Need to explain, can be in the lower side of the sealed cylinder 21 is not covered by the opening (not shown in the figure), the exhaust is blocked by the sealing plug, the sealing plug can be removed regularly, the internal condensate is discharged, the accumulated dust is cleaned, and the water vapor and dust accumulation is avoided to affect the performance of the cable main body 1.

[0056] In addition, the core components of the present application are all split structure, without complex processing, only need to split the half cylinder on the cable main body 1 during installation, fixed through the connecting assembly 43 and the locking piece 22, only need to split the connecting assembly 43 and the locking piece 22 during maintenance, can open the protection unit for maintenance, without destroying the gel and the protection component, compared with the destructive maintenance of the existing gel box and the rewrapping of the heat shrink tube or the adhesive tape, the operation difficulty of the on-site installation and maintenance is greatly reduced, and the operation efficiency is improved.

[0057] Referring to Figure 6 , Figure 7 and Figure 8 The limiting grooves 423 on the two horizontally symmetrical protection half cylinders 421 are communicated with each other on the opposite sides, the protection film 32 made of ePTFE is arranged between the two horizontally symmetrical rubber half rings 31, specifically, the protection film 32 can be installed in a screwing or clamp pressing manner, and the upper and lower symmetrical protection films 32 form an annular structure.

[0058] When the environmental temperature is higher than the high temperature threshold, the gap between the horizontally symmetrical protection half cylinders 421 is the largest, and drives the protection film 32 to open, when the environmental temperature is lower than the low temperature threshold, the protection film 32 is closed, and when the temperature is between the high and low thresholds, the protection film 32 is in a slightly open state; through the arrangement of the protection film 32, the heat and water vapor are allowed to be discharged, and the dust and rainwater are prevented from entering. The protection film 32 can be regularly checked, and when the protection film 32 is damaged, it can be replaced in time.

[0059] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0060] In the description of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0061] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "connected", "mounted", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0062] The above has carried on the detailed introduction to the polyvinyl chloride cable provided by the present application, for the general technical personnel in the art, according to the idea of the embodiment of the present application, the specific implementation mode and the application range will have the change, according to the above, the content of the specification should not be understood as the limitation of the present application.

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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