Intelligent inflatable waterproof and flame-retardant intermediate joint and application method thereof

Abstract

The application discloses a kind of intelligent inflatable waterproof flame-retardant intermediate joints and its application method, the intelligent inflatable waterproof flame-retardant intermediate joint of the present application includes the joint outer protection cylinder body sealed with the outer wall of two connected cables and the protection joint main body arranged in the inner cavity of joint outer protection cylinder body, two connected cables respectively pass through the two ends of joint outer protection cylinder body, then pass through protection joint main body mechanical connection fixed and keep electrically conductive, and waterproof flame-retardant component is arranged between the protection joint main body and cable, and the inner cavity of joint outer protection cylinder body is provided with intelligent inflation component.The present application aims to improve the connection performance and safety of cable line, to ensure that joint can also maintain good working condition in harsh environment.

Description

Technical Field

[0001] The invention belongs to cable connection technology, and in particular relates to an intelligent inflatable waterproof and flame-retardant intermediate joint and an application method thereof. Background Art

[0002] With the continuous development of electrical technology, cable lines are increasingly used in fields such as power transmission and communications. However, the cable connection process often faces critical issues such as waterproofing and flame retardancy, especially in harsh environmental conditions, where these issues are more prominent. Traditional intermediate joints often fail to meet these requirements. Traditional cable intermediate joint application methods often suffer from cumbersome operation and low efficiency, which not only increases installation costs but also easily leads to safety hazards. Therefore, it is necessary to develop a new intermediate joint and its application method to address these issues. Summary of the Invention

[0003] The technical problem to be solved by the present invention: In response to the above-mentioned problems of the prior art, an intelligent inflatable waterproof and flame-retardant intermediate joint and an application method thereof are provided. The present invention aims to improve the connection performance and safety of the cable line and ensure that the joint can maintain good working condition even in harsh environments.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] An intelligent inflatable waterproof and flame-retardant intermediate joint comprises an outer joint protective cylinder sealed with the outer walls of two connected cable sections and a protective joint main body arranged in the inner cavity of the outer joint protective cylinder. The two connected cable sections pass through the two ends of the outer joint protective cylinder respectively and are mechanically connected and fixed by the protective joint main body to maintain electrical conductivity. A waterproof and flame-retardant component is provided between the protective joint main body and the cable, and an intelligent inflatable component is provided in the inner cavity of the outer joint protective cylinder.

[0006] Optionally, the protective joint body includes a sealed metal connecting tube and a cable intermediate joint. The metal conductors of the two connected cable sections are respectively welded or crimped to the sealed metal connecting tube to achieve mechanical connection and maintain electrical conductivity. The cable intermediate joint is made of insulating material and wrapped around the outside of the sealed metal connecting tube and the connection part of the two connected cable sections.

[0007] Optionally, the cable intermediate joint is made of EPDM rubber material.

[0008] Optionally, the waterproof and flame-retardant component includes waterproof putty and an insulating heat shrink sleeve. The waterproof putty is respectively interference fit with the outer wall of the connected cable and the outer wall of the protective joint body to utilize the pressure generated by the interface interference to achieve a first layer of sealing and waterproofing. The insulating heat shrink sleeve is arranged on the outside of the waterproof putty to achieve a second layer of sealing and waterproofing.

[0009] Optionally, the intelligent inflation component includes an inflation pump, an air pressure sensor and a control module, the air pressure sensor is used to monitor the air pressure in the inner cavity of the protective cylinder outside the connector and send it to the input end of the control module, the output end of the control module is connected to the inflation pump to control the inflation pump, and the inflation pump is connected to the inner cavity of the protective cylinder outside the connector through the air inlet so that the control module can control the start and stop of the inflation pump based on the inner cavity air pressure monitored by the air pressure sensor in a closed loop to maintain the air pressure in the inner cavity of the protective cylinder outside the connector stable.

[0010] Optionally, the outer protective cylinder of the joint is composed of a long cylindrical air-filled silo body and short cylindrical air-filled silo bodies arranged on both sides of the long cylindrical air-filled silo body, and the protective joint body is arranged inside the long cylindrical air-filled silo body, one end of the short cylindrical air-filled silo body is sealed connected to the outer wall of the connected cable, and the other end is sealed connected to the long cylindrical air-filled silo body.

[0011] Optionally, cable holes are provided on the adjacent end faces of the short cylindrical inflatable silo body and the long cylindrical inflatable silo body. The outer walls of the connected cables pass through the cable holes on the end faces of the long cylindrical inflatable silo body and the short cylindrical inflatable silo body in turn, and are then mechanically connected and fixed through the protective joint body provided inside the long cylindrical inflatable silo body to maintain electrical conductivity.

[0012] Optionally, a sealing ring is provided between the end faces of the long cylindrical inflatable silo body and the short cylindrical inflatable silo body, and the long cylindrical inflatable silo body and the short cylindrical inflatable silo body are sealed and connected through a sealing ring. The long cylindrical inflatable silo body and the short cylindrical inflatable silo bodies arranged on both sides of the long cylindrical inflatable silo body are sealed and isolated by a fixed pressure plate, a silicone rubber plug, and a sealing rubber plug baffle. The fixed pressure plate is connected to the short cylindrical inflatable silo body through a connecting piece. A through hole with an inclined inner wall is provided in the middle of the fixed pressure plate. A cable hole is provided in the middle of the silicone rubber plug to pass the cable segment. The silicone rubber plug is inserted into the through hole of the fixed pressure plate. The sealing rubber plug baffle is provided at the outer end of the silicone rubber plug. The sealing rubber plug baffle is connected to the fixed pressure plate through a connecting piece to make the silicone rubber plug respectively interference fit with the inclined surface of the through hole of the fixed pressure plate and the outer wall of the cable hole to maintain sealing.

[0013] Optionally, outer walls of the connected cables are sealedly connected to inner walls of the cable holes on the end faces.

[0014] A method for applying the aforementioned intelligent inflatable waterproof and flame-retardant intermediate joint comprises the following steps:

[0015] S1: Remove the outer sheath of the cable to expose the cable metal sheath. Cut the cable metal sheath to a fixed length according to the installation requirements to expose the cable insulation layer. Use a cable stripping knife to process the cable to expose the cable conductor core. Use a piece of glass to scrape off a section of the cable insulation layer to expose the cable insulation.

[0016] S2, pre-install the nylon guide set tool head on the cable conductor core;

[0017] S3, apply lubricating silicone oil on the surface of cable insulation and cable isolation layer;

[0018] S4, positioning the long cylindrical inflatable chamber body and the short cylindrical inflatable chamber body through the nylon guide set tool head and then fitting them along the cable insulation to the cable metal sheath;

[0019] S5, positioning a sealing rubber plug baffle through a nylon guide tool head and then fitting it along the cable insulation to the cable isolation layer;

[0020] S6, positioning a silicone rubber plug through the nylon guide tool head and then fitting it along the cable insulation to the cable isolation layer;

[0021] S7, positioning a fixed pressing plate through a nylon guide set tool head and then fitting it along the cable insulation to the cable isolation layer;

[0022] S8, positioning the short cylindrical inflatable chamber body through the nylon guide set tool head and then fitting it along the cable insulation to the cable metal sheath;

[0023] S9, positioning the long cylindrical inflatable chamber body through the nylon guide set tool head and then fitting it along the cable insulation to the cable metal sheath;

[0024] S10, positioning the cable intermediate joint through the nylon guide tool head and then fitting it onto the cable insulation to form an overlap with the cable isolation layer;

[0025] S11, using a crimping device to connect the cable conductor core to the sealed metal connecting tube to achieve electrical connection between the cable conductor core and the sealed metal connecting tube;

[0026] S12, after the cable intermediate joint is overlapped with the isolation layers of the two cable sections, waterproof putty is wrapped around both ends of the cable intermediate joint;

[0027] S13, wrap the two ends of the cable middle joint with waterproof putty, and then shrink the insulating heat shrink sleeve on the outside;

[0028] S14, assembling the short cylindrical inflatable silo body, the long cylindrical inflatable silo body, the sealing rubber plug baffle, the silicone rubber plug, and the fixed pressure plate to form an intermediate inflatable silo body;

[0029] S15, combining the short cylindrical inflatable silo body with the long cylindrical inflatable silo body to form a second and a third independent inflatable silo body in the short cylindrical inflatable silo body respectively;

[0030] S16, install the intelligent inflatable assembly directly above the short cylindrical inflatable silo body, and respectively mate and install the micro air pump, air pressure sensor, and control module of the intelligent inflatable assembly with the short cylindrical inflatable silo body on the interface with bolts, thereby completing the installation of the intelligent inflatable waterproof and flame-retardant intermediate joint;

[0031] S17, after the installation of the intelligent inflatable waterproof and flame-retardant intermediate joint is completed, the intelligent inflatable component is started, and the air pressure changes inside the inflatable chamber are monitored through the intelligent inflatable component. When a cable line fails and causes gas leakage, the control module of the intelligent inflatable component controls the start and stop of the air pump based on the inner cavity air pressure monitored by the air pressure sensor in a closed loop to maintain the air pressure in the inner cavity of the protective cylinder outside the joint stable.

[0032] Compared with the existing technology, the main technical problems to be solved by the present invention are concentrated on the safety, stability and installation efficiency of cable connection, and the main advantages are as follows:

[0033] 1. Waterproof performance: Cable lines often operate in harsh environments such as humidity and rain. Traditional intermediate joints are often difficult to effectively waterproof, which can easily lead to moisture inside the cable and cause electrical failures. Therefore, the present invention provides an intermediate joint with excellent waterproof performance, which can solve the waterproofing problem at the cable connection.

[0034] 2. Flame retardancy: In emergency situations such as fire, the flame retardancy of cable lines is crucial. Traditional intermediate joints often have poor flame retardancy, and once a fire occurs, it can spread rapidly, causing serious consequences. This invention significantly improves the flame retardancy of the intermediate joint by utilizing flame retardant materials and technologies, providing a strong guarantee for the safe operation of cable lines.

[0035] 3. Installation efficiency and convenience: Traditional methods for installing intermediate joints typically involve multiple, tedious steps, requiring significant time and labor, and can easily lead to safety issues if not performed properly. This invention proposes a simplified and efficient installation method designed to reduce installation costs, improve efficiency, and ensure safety and reliability during the installation process.

[0036] 4. Intelligent Monitoring and Adjustment: Traditional intermediate joints lack intelligent monitoring and adjustment capabilities, making it difficult to monitor and manage the joint status in real time. This invention, by introducing an intelligent inflation system and monitoring technology, enables real-time monitoring and automatic adjustment of the intermediate joint status, improving the operational efficiency and safety of cable lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the partial cross-sectional structure of the intelligent inflatable waterproof and flame-retardant intermediate joint in an embodiment of the present invention.

[0038] Figure 2 It is a schematic cross-sectional structural diagram of the protective joint body in an embodiment of the present invention.

[0039] Figure 3 Schematic diagram of the structure of the intelligent inflatable component in an embodiment of the present invention.

[0040] Figure 4 This is a schematic structural diagram of the outer protective cylinder of the joint in an embodiment of the present invention.

[0041] Figure 5 This is a schematic diagram of the state structure of the cable after pre-processing before connection in an embodiment of the present invention.

[0042] Figure 6 This is a schematic diagram of the principle of use of the nylon guide tool set before the tool head is inserted in an embodiment of the present invention.

[0043] Figure 7 Schematic diagram of the use principle of the nylon guide tool set after the tool head is inserted in the embodiment of the present invention.

[0044] Legend: 1. Protective connector body; 10. Nylon guide tool head; 101. Fixed pressure plate; 102. Silicone rubber plug; 103. Sealing rubber plug baffle; 11. Sealed metal connecting pipe; 12. Cable intermediate joint; 2. Waterproof and flame-retardant components; 21. Waterproof putty; 22. Insulating heat shrink sleeve; 3. Intelligent inflation component; 31. Inflatable pump; 32. Air pressure sensor; 33. Control module; 4. Connector outer protective cylinder; 41. Short cylindrical inflation chamber; 42. Long cylindrical inflation chamber; 5. Outer skin; 6. Cable metal sheath; 7. Cable isolation layer; 8. Cable insulation; 9. Cable conductor core. DETAILED DESCRIPTION

[0045] like Figure 1 As shown, the intelligent inflatable waterproof and flame-retardant intermediate joint in this embodiment includes an outer joint protective cylinder 4 sealed with the outer walls of the two connected cable sections and a protective joint body 1 arranged in the inner cavity of the outer joint protective cylinder 4. The two connected cable sections pass through the two ends of the outer joint protective cylinder 4 respectively and are mechanically connected and fixed by the protective joint body 1 to maintain electrical conductivity. A waterproof and flame-retardant component 2 is provided between the protective joint body 1 and the cable, and an intelligent inflatable component 3 is provided in the inner cavity of the outer joint protective cylinder 4.

[0046] like Figure 2 As shown, the protective joint body 1 in this embodiment includes a sealed metal connecting tube 11 and a cable intermediate joint 12. The metal conductors of the two connected cable sections are respectively welded or crimped to the sealed metal connecting tube 11 to achieve mechanical connection and maintain electrical conductivity. The cable intermediate joint 12 is made of insulating material and wrapped around the outside of the sealed metal connecting tube 11 and the connection part of the two connected cable sections.

[0047] In this embodiment, the cable intermediate joint 12 is made of EPDM rubber, which has good elasticity, aging resistance, and wear resistance. The EPDM rubber joint is designed based on the interference fit between the cable insulation and the cable conductor to achieve a seal between the cable conductor and the insulation interface.

[0048] like Figure 2 As shown, the waterproof and flame-retardant component 2 in this embodiment includes a waterproof putty 21 and an insulating heat shrink sleeve 22. The waterproof putty 21 is respectively interference-fitted with the outer wall of the connected cable and the outer wall of the protective joint body 1 to achieve the first layer of sealing and waterproofing by utilizing the pressure generated by the interface interference. The insulating heat shrink sleeve 22 is sleeved on the outside of the waterproof putty 21 to achieve the second layer of sealing and waterproofing. The waterproof and flame-retardant component 2 achieves the first layer of sealing and waterproofing by the pressure generated by the interface interference of the intermediate joint itself. In addition, after the intermediate joint is installed, the waterproof putty 21 is wrapped around both ends of the intermediate joint, and an insulating heat shrink sleeve 22 is shrunk to achieve the second layer of sealing. Since the insulating heat shrink sleeve 22 itself has flame retardant properties, the waterproof and flame retardant component on the outside of the joint is completed by the interface pressure itself, the waterproof putty 21, and the insulating heat shrink sleeve 22.

[0049] like Figure 3 As shown, the intelligent inflation component 3 in this embodiment includes an inflation pump 31, an air pressure sensor 32 and a control module 33. The air pressure sensor 32 is used to monitor the air pressure in the inner cavity of the protective cylinder 4 outside the connector and send it to the input end of the control module 33. The output end of the control module 33 is connected to the inflation pump 31 to control the inflation pump 31. The inflation pump 31 is connected to the inner cavity of the protective cylinder 4 outside the connector through the air inlet so that the control module 33 can control the start and stop of the inflation pump 31 based on the inner cavity air pressure monitored by the air pressure sensor 32 in a closed-loop manner to maintain the air pressure in the inner cavity of the protective cylinder 4 outside the connector stable.

[0050] like Figure 4 As shown, the outer protective cylinder 4 of the joint in this embodiment is composed of a long cylindrical gas-filled silo body 42 and short cylindrical gas-filled silo bodies 41 arranged on both sides of the long cylindrical gas-filled silo body 42. The protective joint body 1 is arranged inside the long cylindrical gas-filled silo body 42. One end of the short cylindrical gas-filled silo body 41 is sealed with the outer wall of the connected cable, and the other end is sealed with the long cylindrical gas-filled silo body 42. Figure 6In this embodiment, the long cylindrical inflatable silo body 42 and the short cylindrical inflatable silo bodies 41 on both sides of the long cylindrical inflatable silo body 42 are sealed and isolated by a fixed pressure plate 101, a silicone rubber plug 102, and a sealing rubber plug baffle 103. The fixed pressure plate 101 is connected to the short cylindrical inflatable silo body 41 through a connecting piece. The middle part of the fixed pressure plate 101 is provided with a through hole with an inclined inner wall surface, and the middle part of the silicone rubber plug 102 is provided with a cable hole for passing the cable segment. The silicone rubber plug 102 is inserted into the through hole of the fixed pressure plate 101, and the sealing rubber plug baffle 103 is provided at the outer end of the silicone rubber plug 102. The sealing rubber plug baffle 103 is connected to the fixed pressure plate 101 through a connecting piece so as to make the silicone rubber plug 102 interference fit with the inclined surface of the through hole of the fixed pressure plate 101 and the outer wall of the cable hole to maintain sealing.

[0051] Cable holes are provided on the adjacent end faces of the short cylindrical inflatable silo body 41 and the long cylindrical inflatable silo body 42. The outer walls of the connected cables pass through the cable holes on the end faces of the long cylindrical inflatable silo body 42 and the short cylindrical inflatable silo body 41 in turn, and are mechanically connected and fixed through the protective joint body 1 provided inside the long cylindrical inflatable silo body 42 to maintain electrical conductivity.

[0052] A sealing ring is provided between the end surfaces of the long cylindrical inflatable silo body 42 and the short cylindrical inflatable silo body 41 , and the end surfaces of the long cylindrical inflatable silo body 42 and the short cylindrical inflatable silo body 41 are sealed and connected via the sealing ring.

[0053] The outer walls of the connected cables are sealed to the inner walls of the cable holes on the end faces.

[0054] A method for applying the aforementioned intelligent inflatable waterproof and flame-retardant intermediate joint comprises the following steps:

[0055] S1, remove the outer sheath 5 of the cable to expose the cable metal sheath 6, cut the cable metal sheath 6 to a fixed length according to the installation requirements to expose the cable insulation layer 7, use a cable stripping knife to process the cable to expose the cable conductor core 9, and use a glass sheet to scrape out a section of the cable insulation layer 7 to expose the cable insulation 8, as shown in the figure. Figure 5 As shown;

[0056] S2, pre-installing the nylon guide tool head 10 on the cable conductor core 9;

[0057] S3, applying lubricating silicone oil on the surface of the cable insulation 8 and the cable isolation layer 7;

[0058] S4, positioning the long cylindrical inflatable chamber body 42 and the short cylindrical inflatable chamber body 41 through the nylon guide set tool head 10, and then set them along the cable insulation 8 onto the cable metal sheath 6;

[0059] S5, positioning a sealing rubber plug baffle 103 through the nylon guide set tool head 10 and then fitting it along the cable insulation 8 onto the cable isolation layer 7;

[0060] S6, positioning a silicone rubber plug 102 through the nylon guide tool head 10 and then fitting it along the cable insulation 8 onto the cable isolation layer 7;

[0061] S7, a fixed pressing plate 101 is positioned by the nylon guide set tool head 10 and then set along the cable insulation 8 onto the cable isolation layer 7, as shown in FIG. Figure 6 As shown;

[0062] S8, positioning the short cylindrical inflatable chamber body 41 through the nylon guide set tool head 10 and then fitting it along the cable insulation 8 onto the cable metal sheath 6;

[0063] S9, positioning the long cylindrical inflatable chamber body 42 through the nylon guide fitting tool head 10 and fitting it along the cable insulation 8 onto the cable metal sheath 6;

[0064] S10, positioning the cable intermediate joint 12 through the nylon guide fitting tool head 10 and fitting it onto the cable insulation 8 to form an overlap with the cable isolation layer 7;

[0065] S11, the sealed metal connecting tube 11 is crimped to electrically connect the cable conductor core 9 to the sealed metal connecting tube 11;

[0066] S12, after the cable intermediate joint 12 is overlapped with the two cable isolation layers 7, waterproof putty 21 is wrapped around both ends of the cable intermediate joint 12;

[0067] S13, wrapping the two ends of the cable intermediate connector 12 with waterproof putty 21, and then shrinking the insulating heat shrink sleeve 22 on the outside;

[0068] S14, the short cylindrical inflatable silo body 41, the long cylindrical inflatable silo body 42, the sealing rubber plug baffle 103, the silicone rubber plug 102, and the fixed pressure plate 101 are assembled to form an intermediate inflatable silo body;

[0069] S15, the short cylindrical inflatable silo body 41 is combined with the long cylindrical inflatable silo body 42 to form the second and third independent inflatable silo bodies in the short cylindrical inflatable silo body 41, respectively. Figure 7 As shown;

[0070] S16: Install the intelligent inflatable component 3 directly above the short cylindrical inflatable silo body 41. Attach the micro air pump 31, air pressure sensor 32, and control module 33 of the intelligent inflatable component 3 to the interface of the short cylindrical inflatable silo body 41 using bolts, thereby completing the installation of the intelligent inflatable waterproof and flame-retardant intermediate joint.

[0071] S17. After the installation of the intelligent inflatable waterproof and flame-retardant intermediate joint is complete, the intelligent inflatable assembly 3 is activated. The intelligent inflatable assembly 3 monitors changes in the air pressure within the inflatable chamber. When a cable line failure causes gas leakage, the control module 33 of the intelligent inflatable assembly 3 uses closed-loop control of the inflatable pump 31 based on the internal cavity air pressure monitored by the air pressure sensor 32 to maintain stable air pressure within the inner cavity of the joint's outer protective cylinder 4. The intelligent inflatable assembly 3 has an automatic compensation function. When a cable line failure causes gas leakage, the intelligent inflatable system can continuously replenish pressure until the system locates the fault, helping personnel quickly locate and troubleshoot the problem.

[0072] In summary, traditional cable intermediate joint installation methods are often cumbersome and inefficient, increasing installation costs and easily posing safety risks. The present embodiment presents an intelligent, inflatable, waterproof, and flame-retardant intermediate joint, comprising an outer protective joint body sealed to the outer walls of the two connected cable segments, and a protective joint body disposed within the inner cavity of the outer protective joint body. The two connected cable segments pass through the outer protective joint body at both ends, where they are mechanically connected and secured by the protective joint body, maintaining electrical continuity. A waterproof and flame-retardant assembly is disposed between the protective joint body and the cables, and an intelligent inflatable assembly is disposed within the inner cavity of the outer protective joint body. By utilizing intelligent inflatable technology and waterproof and flame-retardant materials, the present embodiment ensures that the joint maintains good working condition even in harsh environments. This enables intelligent management of cable joints, improves their waterproof and flame-retardant properties, and enhances the connection performance and safety of cable lines, ensuring that the joint maintains good working condition even in harsh environments. This embodiment not only improves and innovates existing cable connection technology but also significantly contributes to improving the safety performance of cable lines. This embodiment will help improve the stability and reliability of cable lines, reduce maintenance costs, and promote the further development of electrical technology. The intelligent inflatable waterproof and flame-retardant intermediate joint of this embodiment has a simple structure, and its installation and application have the advantages of being simple, efficient, and safe. By further refining the installation steps of this embodiment, it can be ensured that the installation process of the intelligent inflatable waterproof and flame-retardant intermediate joint is more accurate and reliable. Each step of the operation has been carefully designed and optimized to improve the installation quality and performance. At the same time, the waterproof and flame-retardant properties of the joint are effectively improved, and it can work stably in harsh environments, reducing maintenance costs. The intelligent inflatable waterproof and flame-retardant intermediate joint of this embodiment not only provides detailed installation steps, but also emphasizes how to improve the waterproof and flame-retardant properties of the joint through an intelligent inflation system and a waterproof and flame-retardant coating. Therefore, in actual applications, the intelligent inflatable waterproof and flame-retardant intermediate joint of this embodiment can better meet the high requirements for waterproof and flame-retardant properties in the field of power cables.

[0073] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An intelligent inflatable waterproof and flame-retardant intermediate joint, characterized in that: The invention comprises a joint outer protective cylinder (4) sealed with the outer wall of two connected cable segments and a protective joint body (1) arranged in the inner cavity of the joint outer protective cylinder (4); the two connected cable segments respectively pass through the two ends of the joint outer protective cylinder (4) and are mechanically connected and fixed by the protective joint body (1) to maintain electrical conduction; a waterproof and flame-retardant component (2) is provided between the protective joint body (1) and the cable; an intelligent inflatable component (3) is provided in the inner cavity of the joint outer protective cylinder (4); and the joint outer protective cylinder (4) is provided with a waterproof and flame-retardant component (2). The cylinder (4) is composed of a long cylindrical gas-filled silo (42) and short cylindrical gas-filled silo (41) provided on both sides of the long cylindrical gas-filled silo (42). The protective joint body (1) is provided inside the long cylindrical gas-filled silo (42). One end of the short cylindrical gas-filled silo (41) is sealed to the outer wall of the connected cable, and the other end is sealed to the long cylindrical gas-filled silo (42). A sealing ring is provided between the end faces of the long cylindrical gas-filled silo (42) and the short cylindrical gas-filled silo (41), and the long cylindrical gas-filled silo is sealed to the outer wall of the connected cable. The body (42) and the end surface of the short cylindrical inflatable silo body (41) are sealed and connected by a sealing ring, and the long cylindrical inflatable silo body (42) and the short cylindrical inflatable silo bodies (41) arranged on both sides of the long cylindrical inflatable silo body (42) are sealed and isolated by a fixed pressure plate (101), a silicone rubber plug (102), and a sealing rubber plug baffle (103). The fixed pressure plate (101) is connected to the short cylindrical inflatable silo body (41) through a connecting piece, and the middle part of the fixed pressure plate (101) is provided with an inner wall The silicone rubber plug (102) has a through hole with an inclined surface, a cable hole is provided in the middle of the silicone rubber plug for passing the cable segment, the silicone rubber plug (102) is inserted into the through hole of the fixed pressure plate (101), the sealing rubber plug baffle (103) is provided at the outer end of the silicone rubber plug (102), and the sealing rubber plug baffle (103) is connected to the fixed pressure plate (101) through a connecting piece so as to make the silicone rubber plug (102) respectively interfere with the inclined surface of the through hole of the fixed pressure plate (101) and the outer wall of the cable hole to maintain sealing.

2. The intelligent inflatable waterproof and flame-retardant intermediate joint according to claim 1, characterized in that: The protective joint body (1) comprises a sealed metal connecting tube (11) and a cable intermediate joint (12); the metal conductors of the two connected cable segments are respectively welded or crimped to the sealed metal connecting tube (11) to achieve mechanical connection and maintain electrical conduction; the cable intermediate joint (12) is made of insulating material and wrapped around the outside of the sealed metal connecting tube (11) and the connecting portion of the two connected cable segments.

3. The intelligent inflatable waterproof and flame-retardant intermediate joint according to claim 2, characterized in that: The cable intermediate joint (12) is made of EPDM rubber material.

4. The intelligent inflatable waterproof and flame-retardant intermediate joint according to claim 1, characterized in that: The waterproof and flame-retardant assembly (2) comprises a waterproof putty (21) and an insulating heat shrink sleeve (22); the waterproof putty (21) is respectively interference-fitted with the outer wall of the connected cable and the outer wall of the protective joint body (1) to achieve a first layer of sealing and waterproofing by utilizing the pressure generated by the interface interference; the insulating heat shrink sleeve (22) is sleeved on the outside of the waterproof putty (21) to achieve a second layer of sealing and waterproofing.

5. The intelligent inflatable waterproof and flame-retardant intermediate joint according to claim 1, characterized in that: The intelligent inflation component (3) comprises an inflation pump (31), an air pressure sensor (32) and a control module (33), wherein the air pressure sensor (32) is used to monitor the air pressure in the inner cavity of the connector outer protective cylinder (4) and send the air pressure to the input end of the control module (33), and the output end of the control module (33) is connected to the inflation pump (31) to control the inflation pump (31), and the inflation pump (31) is connected to the inner cavity of the connector outer protective cylinder (4) through an air inlet so that the control module (33) can start and stop the inflation pump (31) in a closed loop based on the inner cavity air pressure monitored by the air pressure sensor (32) to maintain the air pressure in the inner cavity of the connector outer protective cylinder (4) stable.

6. The intelligent inflatable waterproof and flame-retardant intermediate joint according to claim 1, characterized in that: The adjacent end surfaces of the short cylindrical gas-filled silo (41) and the long cylindrical gas-filled silo (42) are both provided with cable holes. The outer wall of the connected cable passes through the cable holes on the end surfaces of the long cylindrical gas-filled silo (42) and the short cylindrical gas-filled silo (41) in sequence and is then mechanically connected and fixed through the protective joint body (1) provided inside the long cylindrical gas-filled silo (42) to maintain electrical conduction.

7. The intelligent inflatable waterproof and flame-retardant intermediate joint according to claim 6, characterized in that: The outer walls of the connected cables are respectively sealed to the inner walls of the cable holes on the end faces.

8. An application method of the intelligent inflatable waterproof and flame-retardant intermediate joint according to claim 7, characterized in that: The steps include: S1, remove the outer sheath (5) of the cable to expose the cable metal sheath (6), cut the cable metal sheath (6) to a fixed length according to the installation requirements to expose the cable insulation layer (7), use a cable stripping knife to process the cable to expose the cable conductor core (9), and use a glass sheet to scrape out a section of the cable insulation layer (7) to expose the cable insulation (8); S2, pre-installing a nylon guide tool head (10) on the cable conductor core (9); S3, applying lubricating silicone oil on the surface of the cable insulation (8) and the cable isolation layer (7); S4, positioning the long cylindrical inflatable chamber body (42) and the short cylindrical inflatable chamber body (41) through the nylon guide set tool head (10), and then fitting them along the cable insulation (8) onto the cable metal sheath (6); S5, positioning a sealing rubber plug baffle (103) through a nylon guide set tool head (10) and then fitting it along the cable insulation (8) onto the cable isolation layer (7); S6, positioning a silicone rubber plug (102) through a nylon guide tool head (10) and then fitting it along the cable insulation (8) onto the cable isolation layer (7); S7, positioning a fixed pressing plate (101) through a nylon guide tool head (10) and then fitting it along the cable insulation (8) onto the cable isolation layer (7); S8, positioning the short cylindrical inflatable chamber body (41) through the nylon guide set tool head (10) and then fitting it along the cable insulation (8) onto the cable metal sheath (6); S9, positioning the long cylindrical inflatable chamber body (42) through the nylon guide set tool head (10) and then fitting it along the cable insulation (8) onto the cable metal sheath (6); S10, positioning the cable intermediate joint (12) through the nylon guide set tool head (10) and then fitting it onto the cable insulation (8) to form an overlap with the cable isolation layer (7); S11, electrically connecting the cable conductor core (9) and the sealed metal connecting tube (11) through a crimping device; S12, after the cable intermediate joint (12) is overlapped with the two cable isolation layers (7), waterproof glue (21) is wrapped around both ends of the cable intermediate joint (12); S13, wrapping the two ends of the cable middle joint (12) with waterproof putty (21), and then shrinking the insulating heat shrink sleeve (22) on the outside; S14, the short cylindrical inflatable silo body (41), the long cylindrical inflatable silo body (42), the sealing rubber plug baffle (103), the silicone rubber plug (102), and the fixed pressure plate (101) are assembled to form an intermediate inflatable silo body; S15, combining the short cylindrical inflatable silo body (41) and the long cylindrical inflatable silo body (42) to form independent second and third inflatable silo bodies in the short cylindrical inflatable silo body (41); S16, installing the intelligent inflatable component (3) directly above the short cylindrical inflatable silo body (41), and matching and installing the micro air pump (31), air pressure sensor (32) and control module (33) of the intelligent inflatable component (3) with the short cylindrical inflatable silo body (41) on the interface through bolts, thereby completing the installation of the intelligent inflatable waterproof and flame-retardant intermediate joint; S17, after the installation of the intelligent inflatable waterproof and flame-retardant intermediate joint is completed, the intelligent inflatable component (3) is started, and the air pressure change inside the inflatable chamber is monitored by the intelligent inflatable component (3). When a cable line fails and causes gas leakage, the control module (33) of the intelligent inflatable component (3) controls the start and stop of the inflatable pump (31) based on the inner cavity air pressure monitored by the air pressure sensor (32) in a closed loop to maintain the air pressure in the inner cavity of the protective cylinder (4) outside the joint stable.

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