10KV cold contraction outdoor terminal cable accessory

Abstract

The utility model relates to the technical field of cold-shrink outdoor terminal heads, and discloses a high-sealing 10KV outdoor cold-shrink cable terminal head, which comprises a cold-shrink outdoor terminal arranged on a cable, and the cold-shrink outdoor terminal comprises a cold-shrink three-branch sleeve and a plurality of cold-shrink tubes. The intersection areas between the branch parts of the cold-contraction three-branch sleeve and the cold-contraction pipes and between the cold-contraction pipes are intersection parts, the structures, located on the inner side and the outer side, in the intersection parts are respectively called an inner pipe and an outer pipe, a sealing mechanism is arranged on any intersection part, and the sealing mechanism comprises an outer attaching pipe attached to the outer side of the outer pipe, and an inner attaching pipe attached to the outer side of the outer pipe; the inner sticking pipe is arranged on the outer side of the cold shrinkage three-branch sleeve in a sticking manner; the two ends of the umbrella-shaped exhaust sleeve are fixedly connected to the outer attaching pipe and the inner attaching pipe respectively. The supporting joint strips are arranged on the outer side wall of the inner joint pipe; wherein a gap is formed between the two supporting joint strips, so that the umbrella-shaped exhaust sleeve is communicated with the intersection part through the gap, and the problems that the intersection part of existing equipment is poor in sealing performance and not waterproof are solved.

Description

Technical Field

[0001] This utility model relates to the field of cable accessory technology, specifically a 10KV cold shrink outdoor terminal cable accessory. Background Technology

[0002] In power cable lines, the 10kV cold-shrink outdoor terminal is a key component for connecting cables to outdoor overhead lines or other electrical equipment, and its performance directly affects the safe and stable operation of the power system. This terminal mainly consists of a cold-shrink insulating tube, a stress-control tube, and sealing components. Its installation principle cleverly utilizes the high elasticity of polymer materials such as silicone rubber—these components are pre-expanded and fitted onto the support tube in the factory. During on-site installation, simply removing the support tube causes the components to automatically shrink under elasticity, tightly fitting the cable and connection points, thus achieving excellent insulation and sealing. Thanks to this characteristic, the terminal can adapt to outdoor environments, effectively resisting the erosion of cable connections by harsh natural conditions such as ultraviolet radiation, rain, and dust, providing a fundamental guarantee for power transmission.

[0003] However, existing 10KV cold-shrink outdoor terminal head technology still has some shortcomings that need improvement. Taking the relevant technical solutions as an example, the intersection of the two ends of the cold-shrink tubing is a significant weak point in its structural design. On the one hand, the sealing performance at this point is weak. Due to the lack of targeted sealing reinforcement design in the wrapping method of the multiple cold-shrink tubing segments, gaps are prone to appear at the intersection under the influence of long-term thermal expansion and contraction and external vibration, resulting in a decrease in the sealing effect and an inability to reliably prevent the intrusion of external impurities. On the other hand, the waterproof performance of the terminal head is also insufficient. Rainwater and moisture in the outdoor environment can easily penetrate into the interior of the terminal head through the tiny gaps at the intersection, which not only affects the insulation performance but may also accelerate the aging of internal components, posing a potential threat to the safety of power transmission. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a 10KV cold-shrink outdoor cable termination accessory. It utilizes an umbrella-shaped sheath to wrap the intersection of the cold-shrink tubing at both ends, which not only improves the sealing performance at the intersection but also enhances the waterproof performance of the termination. Furthermore, by filling the cavity inside the sheath with inert gas or dry powder, its flame-retardant properties can be improved. This solves the problems of insufficient sealing at the intersection of the cold-shrink tubing and insufficient waterproof performance of the termination in existing technologies.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A 10KV cold-shrink outdoor cable termination accessory, including a sealing sheath,

[0009] The sealing sleeve is installed on the outside of the intersection of the two cold shrink tubes. One of the two cold shrink tubes is the upper cold shrink tube and the other is the lower cold shrink tube near the end of the terminal head. The sealing sleeve includes an upper connecting tube that is fixedly installed on the outside of the upper cold shrink tube by cold shrinking. The bottom of the upper connecting tube is fixed with an umbrella-shaped top with an umbrella-shaped structure. The bottom of the umbrella-shaped top is fixed with a barrel-shaped chamber. The bottom of the barrel-shaped chamber is fixed with a lower connecting tube. The lower connecting tube is fixed on the outside of the lower cold shrink tube by cold shrinking.

[0010] The umbrella-shaped top and the inner side of the barrel-shaped interior are provided with a cavity, and the intersection of the upper and lower cold shrink tubes is located inside the cavity.

[0011] Preferably, the barrel-shaped chamber is further provided with a partition, which divides the cavity inside the sealing sleeve into an upper partition and a lower partition. A gas cylinder is installed in the lower partition and is filled with carbon dioxide gas. An expansion relief valve is provided on the side of the gas cylinder near the partition. The expansion relief valve releases gas when the internal pressure of the gas cylinder exceeds a preset value. The gas release direction of the expansion relief valve is towards the side of the cold shrink tube.

[0012] A spraying device is provided on the umbrella-shaped top, the upper partition is filled with dry powder, and multiple through holes are evenly distributed in an array on the partition. When the gas cylinder discharges gas, it carries the dry powder in the upper partition out.

[0013] Preferably, a displacement vent valve is provided on the side of the gas cylinder near the partition, and a triggering device is provided inside the sealing sleeve. The triggering device includes a gasket, which is inserted into the gap at the intersection of the upper and lower cold shrink tubes, and a pressure sensor is provided on the gasket.

[0014] A connecting rod is fixedly connected to the gasket. The connecting rod passes through the displacement vent valve. When the cold shrink tube expands due to heat, it drives the gasket and the connecting rod to move outward, thereby opening the displacement vent valve and allowing the displacement vent valve to vent outward. The venting direction of the displacement vent valve is towards the intersection of the cold shrink tube.

[0015] Preferably, the displacement vent valve includes a displacement vertical pipe, on which a coaxial rear pipe and a displacement nozzle are connected. A connecting rod passes through the displacement nozzle, and a plug is fixed to the end of the connecting rod located inside the displacement vent valve. One end of the plug slides inside the rear pipe, and the other end slides inside the displacement nozzle. At this time, the displacement vertical pipe and the displacement nozzle are blocked by the plug. When the gasket moves outward, it drives the plug to slide, so that the displacement vertical pipe and the displacement nozzle are connected, and the gas in the gas cylinder is ejected sequentially through the displacement vertical pipe and the displacement nozzle.

[0016] Preferably, the spraying devices are uniformly arrayed around the circumference and installed in the spraying device mounting holes on the umbrella-shaped top. The spraying device mounting holes are provided with an outer limiting platform and an inner limiting platform at their inner and outer ends. The spraying device includes a spray pipe that slides within the spraying device mounting holes. The spray pipe has a sealed end near the outer side and an open end near the inner side. The spray pipe has a through hole on its side near the outer side. A nozzle return spring is provided between the spray pipe and the spraying device mounting holes.

[0017] Preferably, the expansion relief valve includes an expansion riser, an expansion nozzle is connected to the middle of the expansion riser, the opening of the expansion nozzle is aligned with the intersection of the cold shrink tube, a piston is slidably disposed inside the expansion riser, the piston has a seal at the end away from the gas cylinder, an opening at the end of the piston close to the gas cylinder, a through hole on the side of the piston at the end away from the gas cylinder, and an expansion return spring is disposed between the piston and the expansion riser.

[0018] Preferably, when the through hole slides to the innermost side, the through hole is attached to the inner limiting platform.

[0019] Preferably, the rear tube and the displacement nozzle are connected in the middle of the displacement vertical tube, and the outer diameter of the plug is smaller than the inner diameter of the displacement vertical tube.

[0020] Preferably, the pressure sensor installed on the gasket is electrically connected to the controller, the controller is connected to a power source, and both the controller and the power source are installed and fixed on the outer wall of the gas cylinder.

[0021] (III) Beneficial Effects

[0022] Compared with the prior art, this utility model provides a 10KV cold-shrink outdoor terminal cable accessory, which has the following beneficial effects:

[0023] 1. This 10KV cold-shrink outdoor terminal cable accessory, by setting the sealing sheath as an umbrella-shaped structure, wraps the intersection of the upper and lower cold-shrink tubes within the cavity of the umbrella-shaped top and the barrel-shaped chamber. It not only improves the sealing performance by wrapping the intersection, but also improves the waterproof performance by utilizing its umbrella-shaped structure. Furthermore, the cavity between the umbrella-shaped top and the barrel-shaped chamber can be filled with inert gas or dry powder to improve its flame-retardant performance. At the same time, the substance filled into the cavity can increase the pressure of the cavity on the cold-shrink tube, further improving the sealing performance.

[0024] 2. This 10KV cold-shrink outdoor terminal cable accessory, by setting up a partition and a gas cylinder in the barrel-shaped chamber, when a circuit fault generates high temperature, the heat is conducted into the gas cylinder, causing the gas cylinder pressure to increase. The expansion relief valve releases carbon dioxide. First, the carbon dioxide is sprayed at the intersection of the cold-shrink tubes, which has a preliminary cooling and flame-retardant effect. Second, the gas passes through the partition, thereby carrying the dry powder in the partition layer and being sprayed out from the spraying device. Since the spraying device is distributed on the umbrella-shaped top, it can evenly spray the carbon dioxide gas carrying the dry powder and distribute it at the terminal, which has a flame-retardant effect.

[0025] 3. This 10KV cold shrink outdoor terminal cable accessory uses a trigger device inside the sealed sheath and a gasket at the intersection of the cold shrink tubes. First, the gasket is used to detect the pressure at the intersection of the two cold shrink tubes. Second, the gasket moves outward when the cold shrink tubes expand to open the displacement vent valve. The displacement vent valve opens and the ejected carbon dioxide gas flow carries dry powder for flame retardancy and cooling. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the 10KV cold shrink outdoor terminal head of this utility model.

[0027] Figure 2 This is a schematic diagram of the structure of the sealing sleeve of this utility model installed on the cold shrink tubing at both ends.

[0028] Figure 3 This is a cross-sectional view of the sealing sleeve of this utility model installed on the cold shrink tubing at both ends.

[0029] Figure 4 This is a cross-sectional perspective view of the sealing sleeve of this utility model.

[0030] Figure 5 This is an exploded view of the sealing sleeve of this utility model.

[0031] Figure 6 This utility model Figure 4 A magnified view of a portion of region A in the middle.

[0032] Figure 7 This is a schematic diagram of the structure of the sealing sleeve housing of this utility model.

[0033] Figure 8 This is a cross-sectional perspective view of the sealing sleeve housing of this utility model.

[0034] Figure 9 This is a schematic diagram of the structure of the gas cylinder of this utility model.

[0035] Figure 10 This is a cross-sectional perspective view of the gas cylinder of this utility model.

[0036] Figure 11This is a schematic diagram of the triggering device of this utility model.

[0037] In the diagram: 1. Sealing sleeve; 11. Upper connecting pipe; 12. Umbrella-shaped top; 13. Barrel-shaped chamber; 14. Lower connecting pipe; 15. Partition; 101. Upper partition; 102. Lower partition; 121. Sprayer mounting hole; 1211. Outer limiting platform; 1212. Inner limiting platform; 21. Upper cold shrink tube; 22. Lower cold shrink tube; 3. Sprayer; 31. Spray pipe; 32. Through hole; 33. Nozzle return spring; 4. Gas cylinder; 41. Displacement vent valve; 42. Expansion vent valve; 411. Displacement vertical pipe; 412. Rear pipe; 413. Displacement spray pipe; 421. Expansion vertical pipe; 422. Expansion spray pipe; 423. Piston; 424. Expansion return spring; 5. Triggering device; 51. Gasket; 52. Connecting rod; 53. Plug. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0040] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] Example 1:

[0043] This embodiment provides a 10KV cold-shrink outdoor terminal cable accessory, which has the following technical features.

[0044] Please see Figure 1-11 A 10KV cold-shrink outdoor cable termination accessory, including a sealing sheath 1,

[0045] The sealing sleeve 1 is installed on the outside of the intersection of the two cold shrink tubes. One of the two cold shrink tubes is the upper cold shrink tube 21 and the other is the lower cold shrink tube 22, which is closer to the end of the terminal head. The sealing sleeve 1 includes an upper connecting tube 11 that is fixedly installed on the outside of the upper cold shrink tube 21 by cold shrinking. The bottom of the upper connecting tube 11 is fixed with an umbrella-shaped top 12 with an umbrella skirt structure. The bottom of the umbrella-shaped top 12 is fixed with a barrel-shaped chamber 13. The bottom of the barrel-shaped chamber 13 is fixed with a lower connecting tube 14. The lower connecting tube 14 is fixed on the outside of the lower cold shrink tube 22 by cold shrinking.

[0046] A cavity is provided inside the umbrella-shaped top 12 and the barrel-shaped chamber 13, and the intersection of the upper cold shrink tube 21 and the lower cold shrink tube 22 is located inside the cavity.

[0047] In an optional embodiment, a partition 15 is also provided inside the barrel-shaped chamber 13. The partition 15 divides the cavity inside the sealing sleeve 1 into an upper partition 101 and a lower partition 102. A gas cylinder 4 is installed in the lower partition 102. The gas cylinder 4 is filled with carbon dioxide gas. An expansion relief valve 42 is provided on the side of the gas cylinder 4 near the partition 15. The expansion relief valve 42 releases gas when the internal pressure of the gas cylinder 4 exceeds a preset value. The exhaust direction of the expansion relief valve 42 is towards the side of the cold shrink tube.

[0048] A spraying device 3 is provided on the umbrella-shaped top 12. The upper partition 101 is filled with dry powder. Multiple through holes are evenly distributed in an array on the partition 15. When the gas cylinder 4 discharges gas, it carries the dry powder in the upper partition 101 out.

[0049] In an optional embodiment, a displacement relief valve 41 is also provided on the side of the gas cylinder 4 near the partition 15, and a triggering device 5 is also provided inside the sealing sleeve 1. The triggering device 5 includes a gasket 51, which is inserted into the gap at the intersection of the upper shrink tube 21 and the lower shrink tube 22. A pressure sensor is provided on the gasket 51.

[0050] A connecting rod 52 is fixedly connected to the gasket 51. The connecting rod 52 passes through the displacement vent valve 41. When the cold shrink tube is heated and expands, it drives the gasket 51 and the connecting rod 52 to move outward, thereby opening the displacement vent valve 41 and venting the gas outward. The venting direction of the displacement vent valve 41 is towards the intersection of the cold shrink tube.

[0051] In an optional embodiment, the displacement relief valve 41 includes a displacement riser 411, through which a coaxial rear pipe 412 and a displacement nozzle 413 are connected. A connecting rod 52 passes through the displacement nozzle 413, and a plug 53 is fixed at the end of the connecting rod 52 located inside the displacement relief valve 41. One end of the plug 53 slides inside the rear pipe 412, and the other end slides inside the displacement nozzle 413. At this time, the displacement riser 411 and the displacement nozzle 413 are blocked by the plug 53. When the gasket 51 moves outward, it drives the plug 53 to slide, so that the displacement riser 411 and the displacement nozzle 413 are connected, and the gas in the gas cylinder 4 is ejected sequentially through the displacement riser 411 and the displacement nozzle 413.

[0052] Furthermore, a through hole is provided on the rear tube 412 to balance the pressure when the plug 53 slides.

[0053] In an optional embodiment, the spraying device 3 is uniformly arrayed in a circumferential pattern within the spraying device mounting holes 121 on the umbrella-shaped top 12. The spraying device mounting holes 121 are provided with an outer limiting platform 1211 and an inner limiting platform 1212 at their inner and outer ends. The spraying device 3 includes a spray pipe 31 that slides within the spraying device mounting holes 121. The spray pipe 31 has a sealed end near its outer side and an open end near its inner side. The spray pipe 31 has a through hole 32 on its outer side. A nozzle return spring 33 is provided between the spray pipe 31 and the spraying device mounting holes 121.

[0054] It should be noted that when the pressure inside the sealed sleeve 1 increases, that is, when the gas cylinder 4 is venting, the nozzle 31 is squeezed and slides outward, and the through hole 32 is exposed to the outside, and the gas is sprayed. When the pressure inside the sealed sleeve 1 is normal, the through hole 32 slides inward under the action of the nozzle reset spring 33, and the through hole 32 is hidden in the spraying device mounting hole 121.

[0055] In an optional embodiment, the expansion relief valve 42 includes an expansion riser 421, with an expansion nozzle 422 connected to the middle of the expansion riser 421. The opening of the expansion nozzle 422 is aligned with the intersection of the cold shrink tube. A piston 423 is slidably disposed inside the expansion riser 421. The piston 423 has a seal at the end away from the gas cylinder 4 and an opening at the end near the gas cylinder 4. A through hole is provided on the side of the piston 423 at the end away from the gas cylinder 4. An expansion return spring 424 is disposed between the piston 423 and the expansion riser 421.

[0056] In an optional embodiment, when the through hole 32 slides to its innermost side, the through hole 32 is attached to the inner limiting stage 1212.

[0057] In an optional embodiment, the rear tube 412 and the displacement nozzle 413 are connected at the middle position of the displacement riser 411, and the outer diameter of the plug 53 is smaller than the inner diameter of the displacement riser 411.

[0058] In an optional embodiment, a pressure sensor mounted on gasket 51 is electrically connected to a controller, which is connected to a power source. Both the controller and the power source are mounted and fixed on the outer wall of gas cylinder 4.

[0059] It should be noted that the pressure sensor is connected to the controller via wires, and both the controller and the power supply are fixed to the outer wall of gas cylinder 4 with glue.

[0060] In an optional embodiment, the controller is further configured to connect and control an alarm and a temperature sensor. The alarm is mounted and fixed on the outside of the barrel-shaped chamber 13, and the temperature sensor is mounted on the side of the gas cylinder 4 that is attached to the cold shrink tube.

[0061] Furthermore, a gap is left between the upper end face of the gas cylinder 4 and the partition plate 15, and the displacement vent valve 41 and the expansion vent valve 42 are both located in the gap.

[0062] Furthermore, a solenoid valve is installed on the side of the gas cylinder 4 near the partition 15. When the temperature sensor or pressure sensor detects an abnormal temperature or pressure, the solenoid valve is controlled to open. Alternatively, the solenoid valve can be remotely opened by controlling the solenoid valve.

[0063] Furthermore, a filling valve is installed at the bottom of the gas cylinder 4. The filling valve passes through the barrel-shaped chamber 13 and fills the gas cylinder 4 with carbon dioxide. The filling valve is a one-way valve.

[0064] Furthermore, a cylindrical plastic film is connected to the inner side of the partition 15, and the other end of the plastic film passes through the upper connecting pipe 11. When dry powder is added to the upper partition 101, the plastic film wraps the dry powder inside the upper partition 101.

[0065] It should be noted that the inner hole of the partition 15 is circular, and the plastic film is cylindrical. The bottom of the cylindrical plastic film is fixed on the inner hole of the partition 15, and the top of the cylindrical plastic film passes through the upper connecting tube 11. When the dry powder is filled, the upper connecting tube 11 is in the open state. After cooling and shrinking, the plastic film is squeezed onto the cooling and shrinking tube by the upper connecting tube 11.

[0066] Furthermore, the barrel-shaped chamber 13 is connected to the bottom of the umbrella-shaped top 12 by glue or threads. After the partition 15 and the gas cylinder 4 are installed in the barrel-shaped chamber 13, the barrel-shaped chamber 13 is then fixed to the bottom of the umbrella-shaped top 12.

[0067] Furthermore, the upper connecting pipe 11 and the umbrella-shaped top 12 are integrated into one structure, and the barrel-shaped chamber 13 and the lower connecting pipe 14 are integrated into one structure.

[0068] It should be noted that cold shrink installation utilizes the high elasticity of polymer materials such as silicone rubber. These components are pre-expanded and fitted onto the support tube in the factory. During on-site installation, the support tube is simply pulled out, and these components will automatically shrink and fit tightly against the cable and connection points under the action of elasticity, forming a good insulation and sealing effect.

[0069] Furthermore, the partition 15 is slidably disposed on the inner wall of the barrel-shaped chamber 13.

[0070] Furthermore, the inner walls of both the upper connecting pipe 11 and the lower connecting pipe 14 are provided with annular grooves, and elastic sealing rings are installed in the annular grooves.

[0071] It should be noted that by setting an annular groove and installing an elastic sealing ring on the inner wall of the sealing sleeve 1 and the lower connecting tube 14, when the sealing sleeve 1 is fixed to the outside of the cold shrink tube by cold shrinking, the elastic sealing ring can further enhance the sealing between the upper connecting tube 11 and the upper cold shrink tube 21, and between the lower connecting tube 14 and the lower cold shrink tube 22, effectively preventing moisture, dust and other substances from entering.

[0072] Furthermore, the outer wall of the barrel-shaped chamber 13 is provided with a heat insulation layer, which is made of high-temperature resistant heat insulation material.

[0073] It should be noted that the heat insulation layer on the outer wall of the barrel-shaped chamber 13 can reduce the influence of the external ambient temperature on the interior of the barrel-shaped chamber 13, prevent abnormal pressure changes in the gas cylinder 4 due to high external temperature, ensure the stability of the gas cylinder 4 under normal circuit conditions, and at the same time, slow down the heat diffusion to the outside when high temperature is generated by circuit fault, thus enhancing the flame retardant effect.

[0074] Furthermore, the connecting rod 52 is made of high-temperature resistant alloy material and its surface is coated with an anti-corrosion coating.

[0075] It should be noted that the connecting rod 52 is made of high-temperature resistant alloy material, which can maintain structural stability in high-temperature environments such as thermal expansion of the cold shrink tube, and avoid affecting the normal operation of the triggering device 5 due to high-temperature deformation; the surface is coated with an anti-corrosion coating to prevent the connecting rod 52 from being corroded during long-term use, extend its service life, and ensure the reliability of the triggering device 5.

[0076] Furthermore, a filter screen is installed at the through hole 32 of the nozzle 31, and the pore size of the filter screen is smaller than the diameter of the dry powder particles.

[0077] It should be noted that installing a filter screen at the through hole 32 of the nozzle 31 can prevent the dry powder from clogging the through hole 32 during the spraying process, ensuring the normal powder spraying function of the spraying device 3; at the same time, the filter screen can prevent external impurities from entering the interior of the sealing sleeve 1 through the through hole 32, protecting the internal components from contamination.

[0078] Working principle: The sealing sleeve 1 is fixed by the cold shrinkage of the upper connecting pipe 11 and the lower connecting pipe 14, and the intersection of the upper cold shrinkage tube 21 and the lower cold shrinkage tube 22 is wrapped in the internal cavity. The basic seal is achieved with the inner wall elastic sealing ring. The umbrella-shaped top 12 enhances the rainproof and dirtproof ability. When the cold shrinkage tube is heated and expands, the gap at the intersection drives the gasket 51 and the connecting rod 52 to move, opening the displacement vent valve 41, so that the carbon dioxide in the gas cylinder 4 is directly sprayed to the intersection through the displacement nozzle 413 to cool it down. If the temperature continues to rise and the pressure in the gas cylinder 4 exceeds the preset value, the expansion vent valve 42 opens automatically. The gas carries the dry powder in the upper partition 101 and pushes the nozzle 31 to slide against the elastic force of the nozzle return spring 33, so that the through hole 32 is exposed and dry powder is sprayed out to extinguish the fire. At the same time, the pressure sensor on the gasket 51 and the temperature sensor on the gas cylinder 4 can be linked with the controller to trigger the alarm to issue a warning. The heat insulation layer on the outer wall of the barrel-shaped chamber 13 and the high-temperature resistant connecting rod 52 ensure the stability of the overall structure.

[0079] In summary, by setting up a partition 15 and a gas cylinder 4 inside the barrel-shaped chamber 13, when a circuit fault generates high temperatures, the heat is conducted into the gas cylinder 4, causing the pressure in the gas cylinder 4 to increase. The expansion relief valve 42 then releases carbon dioxide. First, the carbon dioxide is sprayed towards the intersection of the cooling and shrinking tubes, achieving a preliminary cooling and flame-retardant effect. Second, the gas passes through the partition 15, thereby carrying the dry powder in the upper partition 101 and being sprayed out from the spraying device 3. Since the spraying device 3 is distributed on the umbrella-shaped top 12, it can evenly spray the carbon dioxide gas carrying the dry powder and distribute it at the terminal head, achieving a flame-retardant effect.

[0080] In summary, by setting the sealing sleeve 1 to be a skirt-like structure, which wraps the intersection of the upper cold shrink tube 21 and the lower cold shrink tube 22 within the cavity of the umbrella-shaped top 12 and the barrel-shaped chamber 13, it can not only improve the sealing performance by wrapping the intersection, but also improve the waterproof performance by utilizing its skirt-like structure. Furthermore, the cavity within the umbrella-shaped top 12 and the barrel-shaped chamber 13 can be filled with inert gas or dry powder to improve its flame retardant performance. At the same time, the substance filled into the cavity can increase the pressure of the cavity on the cold shrink tube, further improving the sealing performance.

[0081] In summary, by setting a trigger device 5 inside the sealing sleeve 1 and a gasket 51 at the intersection of the cold shrink tubes, firstly, the gasket 51 is used to detect the pressure at the intersection of the two cold shrink tubes. Secondly, the gasket 51 moves outward to open the displacement vent valve 41 when the cold shrink tube expands. The displacement vent valve 41 opens the sprayed carbon dioxide gas flow to carry dry powder for flame retardancy and cooling.

[0082] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0083] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A 10KV cold-shrink outdoor cable termination accessory, comprising a sealing sheath (1), characterized in that: The sealing sleeve (1) is installed on the outside of the intersection of the two cold shrink tubes. One of the two cold shrink tubes is the upper cold shrink tube (21) and the other is the lower cold shrink tube (22) near the end of the terminal head. The sealing sleeve (1) includes an upper connecting tube (11) that is fixedly installed on the outside of the upper cold shrink tube (21) by cold shrinking. The bottom of the upper connecting tube (11) is fixed with an umbrella-shaped top (12) with an umbrella skirt structure. The bottom of the umbrella-shaped top (12) is fixed with a barrel-shaped chamber (13). The bottom of the barrel-shaped chamber (13) is fixed with a lower connecting tube (14). The lower connecting tube (14) is fixed on the outside of the lower cold shrink tube (22) by cold shrinking. A cavity is provided inside the umbrella-shaped top (12) and the barrel-shaped chamber (13), and the intersection of the upper cold shrink tube (21) and the lower cold shrink tube (22) is located inside the cavity.

2. The 10KV cold-shrink outdoor terminal cable accessory according to claim 1, characterized in that, The barrel-shaped chamber (13) is also provided with a partition (15), which divides the cavity inside the sealing sleeve (1) into an upper partition (101) and a lower partition (102). A gas cylinder (4) is installed in the lower partition (102), which is filled with carbon dioxide gas. An expansion relief valve (42) is provided on the side of the gas cylinder (4) near the partition (15). The expansion relief valve (42) releases gas when the internal pressure of the gas cylinder (4) exceeds a preset value. The exhaust direction of the expansion relief valve (42) is towards the side of the cold shrink tube. A spraying device (3) is provided on the umbrella-shaped top (12), the upper partition (101) is filled with dry powder, and multiple through holes are evenly distributed in an array on the partition (15). When the gas cylinder (4) discharges gas, it carries the dry powder in the upper partition (101) out.

3. A 10KV cold-shrink outdoor terminal cable accessory according to claim 2, characterized in that, The gas cylinder (4) is also provided with a displacement relief valve (41) on the side near the partition (15), and a triggering device (5) is also provided inside the sealing sleeve (1). The triggering device (5) includes a gasket (51), which is inserted into the gap at the intersection of the upper cold shrink tube (21) and the lower cold shrink tube (22). A pressure sensor is provided on the gasket (51). A connecting rod (52) is fixedly connected to the gasket (51). The connecting rod (52) is inserted into the displacement vent valve (41). When the cold shrink tube is heated and expands, it drives the gasket (51) and the connecting rod (52) to move outward, thereby opening the displacement vent valve (41) and venting the displacement vent valve (41) outward. The venting direction of the displacement vent valve (41) is towards the intersection of the cold shrink tube.

4. A 10KV cold-shrink outdoor terminal cable accessory according to claim 3, characterized in that, The displacement relief valve (41) includes a displacement vertical tube (411), on which a coaxial rear tube (412) and a displacement nozzle (413) are connected. The connecting rod (52) passes through the displacement nozzle (413). A plug (53) is fixed at the end of the connecting rod (52) located inside the displacement relief valve (41). One end of the plug (53) slides in the rear tube (412), and the other end slides in the displacement nozzle (413). At this time, the displacement vertical tube (411) and the displacement nozzle (413) are blocked by the plug (53). When the gasket (51) moves outward, it drives the plug (53) to slide, so that the displacement vertical tube (411) and the displacement nozzle (413) are connected, so that the gas in the gas cylinder (4) is ejected through the displacement vertical tube (411) and the displacement nozzle (413) in sequence.

5. A 10KV cold-shrink outdoor terminal cable accessory according to claim 3, characterized in that, The spraying device (3) is uniformly arrayed in a circumferential pattern and installed in the spraying device mounting holes (121) on the umbrella-shaped top (12). The spraying device mounting holes (121) are provided with an outer limiting platform (1211) and an inner limiting platform (1212) at both the inner and outer ends. The spraying device (3) includes a spray pipe (31) that slides in the spraying device mounting holes (121). The spray pipe (31) has a sealed end near the outer side and an opening near the inner side. The spray pipe (31) has a through hole (32) on the side near the outer side. A nozzle return spring (33) is provided between the spray pipe (31) and the spraying device mounting holes (121).

6. A 10KV cold-shrink outdoor terminal cable accessory according to claim 3, characterized in that, The expansion relief valve (42) includes an expansion riser (421), an expansion nozzle (422) is connected in the middle of the expansion riser (421), the opening of the expansion nozzle (422) is aligned with the intersection of the cold shrink tube, a piston (423) is slidably disposed inside the expansion riser (421), the piston (423) is provided with a seal at the end away from the gas cylinder (4), the piston (423) is provided with an opening at the end near the gas cylinder (4), the piston (423) is provided with a through hole on the side of the end away from the gas cylinder (4), and an expansion return spring (424) is provided between the piston (423) and the expansion riser (421).

7. A 10KV cold-shrink outdoor terminal cable accessory according to claim 5, characterized in that, When the through hole (32) slides to the innermost side of the spray device mounting hole (121), the through hole (32) is attached to the inner limit platform (1212).

8. A 10KV cold-shrink outdoor cable termination accessory according to claim 4, characterized in that, The rear tube (412) and the displacement nozzle (413) are connected in the middle of the displacement vertical tube (411), and the outer diameter of the plug (53) is smaller than the inner diameter of the displacement vertical tube (411).

9. A 10KV cold-shrink outdoor terminal cable accessory according to claim 3, characterized in that, The pressure sensor installed on the gasket (51) is electrically connected to the controller. The controller is connected to a power source. Both the controller and the power source are installed and fixed on the outer wall of the gas cylinder (4).

10. A 10KV cold-shrink outdoor terminal cable accessory according to claim 9, characterized in that, The controller is also connected to an alarm and a temperature sensor. The alarm is installed and fixed on the outside of the barrel-shaped chamber (13), and the temperature sensor is installed on the side of the gas cylinder (4) that is attached to the cold shrink tube.

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