An underwater cable plug boot and method of installation

Abstract

The application provides an underwater cable plug protective sleeve and a mounting method, and belongs to the technical field of rescue equipment. The technical problems of inconvenient disassembly and assembly of the protective sleeve of the cable joint, no gas leakage alarm function when leaking, and also unable to quickly locate the leakage point are solved. The technical scheme is that the protective sleeve comprises two outer shell bodies with openings and two arc-shaped sealing air bags. The two outer shell bodies are buckled to form a closed protective shell, and the two sealing air bags are buckled to form a closed protective bag. The arc-shaped structure of each sealing air bag is internally provided with an inner shell body. Expansion air nozzles are arranged on the two sealing air bags. A pressure sensor is further arranged in the inner shell body. The mounting method is to lock through hand-tightening nuts and hand-tightening bolts. The application has the beneficial effects of convenient disassembly and assembly, reusability, good sealing effect, gas leakage alarm function, and quick leakage point positioning.

Description

Technical Field

[0001] This invention relates to the field of flood control, drainage and emergency rescue equipment technology, and in particular to an underwater cable plug protective sleeve and its installation method. Background Technology

[0002] With global warming and the increasing frequency of extreme convective weather, urban flooding disasters caused by these events not only impact regional economic development but also pose a significant threat to the lives and property of the people. Portable pump-type emergency drainage vehicles are widely used due to their advantages such as large pump flow rate, wide applicability, flexibility, convenience, and quick operation. During drainage operations, to reduce the weight of the portable pump and thus the workload of operators, it is often equipped with segmented cables (connected by cable connectors). However, currently, the plugs of such cables cannot be submerged in water for extended periods. Rescue personnel often need to operate in dry environments or using overhead cables, which is neither safe nor convenient.

[0003] Although there are numerous existing studies on cable joint insulation and sealing connections, such as Chinese Patent CN203644433U, which includes a cable body and a rubber sheath fixed to the outside of the cable body, the cable body includes an insulating outer layer and several core wires passing through the insulating outer layer, a sealing element is radially fixed to the rubber sheath, and a cylindrical protective sleeve made of rigid material is fixed between the rubber sheath and the cable body, the protective sleeve allows the cable body to pass through, and when the sealing element is compressed and deformed, the protective sleeve fully bears the radial extrusion force generated by the sealing element; Chinese Patent CN2 01921364369.5 A cable junction box suitable for communication engineering, which adopts a box-shaped seal formed by a box body and a box cover, with the cable connection components placed inside the box and sealed by filling with waterproof sealant; Chinese Patent CN201410847528.2 A watertight connection device for underwater cable joints, which adopts an inner sealing cylinder, an outer sealing cylinder and a special waterproof sealant to achieve a three-layer seal for the cable core wire; Chinese Patent CN202020782657.9 A submarine cable junction box, which is mainly sealed by injecting liquid into the cylinder through an injection hole.

[0004] The above-mentioned sealing and insulation methods can be roughly divided into three types: the first type uses rubber sheath compression sealing; the second type uses sealed box structure sealing; and the third type uses potting sealant sealing.

[0005] The first method, while simple in structure, cannot achieve long-term underwater insulation and sealing. The second and third methods, while offering relatively good sealing, are cumbersome to operate and cannot meet the needs of rapid sealing in disaster relief, nor can they be disassembled and reused. Furthermore, none of these three sealing structures allow for quick and effective checking of the seal, and leaks cannot be quickly located. For example, the first method cannot detect leaks at all; the second method requires opening the sealed enclosure to check for water droplets, and resealing afterward cannot guarantee a tight and reliable seal, failing to meet the requirement for timely monitoring; the third method, while offering good sealing, cannot meet the requirements for rapid sealing and reusability at disaster relief sites.

[0006] Therefore, there is an urgent need for a new type of underwater cable plug protective sleeve to solve the above technical problems. Summary of the Invention

[0007] The purpose of this invention is to provide an underwater cable plug protective sleeve and an installation method. The cable plug protective sleeve has a good sealing effect, can be quickly disassembled and reassembled, can be reused repeatedly, and can monitor the sealing effect in real time during use, and can quickly locate the leakage point when leakage occurs.

[0008] To achieve the above-mentioned objectives, the present invention employs the following technical solution: an underwater cable plug protective sleeve, comprising two outer shells with openings and two arc-shaped sealing airbags. The two outer shells are fastened together to form a sealed protective shell, and the two sealing airbags are fastened together to form a sealed protective bladder. The protective shells have external cable holes at both ends, and the protective bladders have intermediate cable holes at both ends. Each sealing airbag has an inner shell inside its arc-shaped structure. When the two inner shells are fastened together, their two ends form internal cable holes. The installed cable plug is placed between the two inner shells, between the two sealing airbags, and between the two outer shells. The tail cable of the cable plug passes sequentially through the inner cable hole, the intermediate cable hole, and the external cable hole. Each of the two sealing airbags is equipped with an expansion nozzle, and one of the sealing airbags is equipped with a colored smoke nozzle. Both the expansion nozzle and the colored smoke nozzle extend out of the protective shell.

[0009] Furthermore, the colored smoke nozzle is located on the side of the sealing airbag away from the inner shell. The colored smoke nozzle penetrates the sealing airbag and the inner shell. After the colored smoke enters the inner shell through the colored smoke nozzle, it contacts the cable connector and forms a certain pressure. Thus, when the protective airbag leaks water, the colored smoke will leak out and bubble on the water surface, serving as an alarm function.

[0010] Furthermore, each of the outer shell, sealing airbag, and inner shell is provided with an arc-shaped groove one, an arc-shaped groove two, and an arc-shaped groove three at both ends. The arc-shaped groove one, arc-shaped groove two, and arc-shaped groove three at both ends of the outer shell, sealing airbag, and inner shell respectively form an outer cable hole, a middle cable hole, and an inner cable hole. After the protective sleeve is installed, the cables at both ends of the cable plug will pass through the inner cable hole, the middle cable hole, and the outer cable hole in sequence.

[0011] Furthermore, after the two outer shells are fastened together, three air nozzle channels are provided on their exterior, which are respectively used for the passage of two expansion nozzles and one colored smoke nozzle.

[0012] Furthermore, the inner diameter of the intermediate cable hole is smaller than the outer diameter of the cable. In actual installation, the size of the intermediate cable hole is slightly smaller than the outer diameter of the cable. This allows the intermediate cable hole to fit tightly against and wrap around the cable after installation, which helps improve the waterproof effect. The inner diameters of both the outer and inner cable holes are larger than the outer diameter of the intermediate cable. This allows the sealing airbag to expand at the intermediate cable hole after inflation, without being restricted by the inner and outer shells that are adhered to the sealing airbag. This tightly wraps the cable and improves the waterproof performance.

[0013] Furthermore, the two outer shells are provided with mounting holes. After the two outer shells are fastened together, they are locked together by hand-tightening bolts and hand-tightening nuts. The mounting holes, hand-tightening bolts and hand-tightening nuts enable the device to be quickly assembled and disassembled, and facilitate subsequent reuse, thus saving on usage costs.

[0014] Furthermore, the inner shell is adapted to the inner wall of the arc-shaped structure of the sealing airbag and is fixedly connected to the inner wall of the arc-shaped structure of the sealing airbag. The sealing airbag and the inner shell can be connected by adhesive during the manufacturing process. After the sealing airbag is inflated, the inner shell can restrict the inward expansion of the sealing airbag, allowing the inflated airbag to fill the gap between the inner and outer shells and enhance the sealing performance. On the other hand, it can ensure that there is a certain gap between the sealing airbag and the cable connector, which facilitates the filling of colored gas between the two sealing airbags and also reserves space for the installation of the pressure sensor.

[0015] Furthermore, a pressure sensor is fixedly installed on the inner wall of the inner shell. The pressure sensor is wirelessly connected to an external controller. After the colored smoke is filled between the two sealed airbags, there is a certain pressure. The pressure sensor will monitor this pressure. When the colored smoke leaks, the pressure decreases. After the pressure sensor detects this, it will send the location information of the cable connector to an external display. In this way, the emergency personnel can quickly locate the leak point and reduce the investigation time.

[0016] Furthermore, the expansion nozzle and the colored smoke nozzle pass through the corresponding nozzle channel and extend out of the outer shell. Each of their extended ends is provided with a detachable rubber cap. The rubber cap is made of high-performance engineering plastic injection molding and has good resistance to acid, alkali, salt, corrosion, aging, and ultraviolet rays. It has strong resistance to outdoor environments and plays a role in preventing the nozzle from being blocked by mud and sand.

[0017] To better achieve the above-mentioned objectives, the present invention also provides a method for installing an underwater cable plug protective sleeve, the method comprising the following steps:

[0018] S1: Connect the cable plugs at both ends and tighten them with their own male and female threads. Then, fasten the two sealing airbags and the inner shell around the outside of the cable plug to form a protective bag.

[0019] S2: The two housings are fastened to the outside of the two sealed airbags to form a protective shell. The mating surfaces of the two housings are set at 90° perpendicular to the mating surfaces of the two sealed airbags. The expansion nozzles and colored smoke nozzles of the sealed airbags extend out of the protective shell through the corresponding nozzle channels.

[0020] S3: Tighten the hand-tightening nuts and bolts on the mounting holes;

[0021] S4: Use a handheld air pump to inflate and seal the two sealing airbags through the expansion nozzle. After inflation, the sealing airbags will expand to the inside and outside. The outer shell and inner shell will restrict the expansion of the sealing airbags, so that the sealing airbags tightly fill the protective space formed by the outer shell and inner shell. In particular, the joint surfaces of the two sealing airbags overlap to make the fit even tighter after inflation.

[0022] S5: Use a handheld air pump to fill the inner shell with colored smoke through the colored smoke nozzle. The colored smoke serves to check whether the joint surfaces of the two sealed airbags and the middle cable hole are completely sealed.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. The protective cover has a good sealing effect: The protective shell is equipped with two sealing airbags inside. After the sealing airbags are inflated, they expand. The outer shell and inner shell can respectively restrict the outer and inner sides of the sealing airbags, making the joint surfaces of the two airbags fit more tightly. At the same time, the middle cable hole will also expand and tightly wrap the cable, thereby greatly improving the waterproof performance.

[0025] 2. The protective cover is easy to assemble and disassemble and is reusable: The assembly components of this device include two outer shells and two sealing airbags. The inner shell is connected to the sealing airbags, and the pressure sensor is installed on the inner wall of the inner shell. Therefore, during installation, the two sealing airbags are wrapped around the outside of the cable connector, and then the two outer shells are wrapped around the outside of the sealing airbags. The outer shells are then locked by hand-tightening bolts, hand-tightening nuts, and mounting holes. During disassembly, the air inside the sealing airbags is first expelled, and then the hand-tightening bolts and hand-tightening nuts are removed. Therefore, it is easy to assemble and disassemble, meets the needs of waterproofing, flood drainage, and emergency rescue, and is reusable, reducing the cost of use.

[0026] 3. The waterproof sleeve can serve as an alarm when it leaks: During operation, if the pressure of the sealing airbag drops, causing a gap, it indicates that there is a leak at the cable joint. Colored smoke with a certain pressure will be discharged, and colored bubbles will appear on the water surface, making it easier for rescue personnel to detect and thus serving as an alarm. In addition, depending on the different pressure levels of the sealing airbag, it can adapt to different water depths, making it highly practical and widely applicable.

[0027] 4. The waterproof sleeve can quickly locate leaks: Both the colored smoke with a certain pressure and the pressure sensor are located inside the inner shell. The pressure sensor monitors the pressure of the colored smoke. When the colored smoke leaks out, the pressure will drop. After the pressure sensor detects this, it will transmit the location information to the external display, which will facilitate the emergency personnel to quickly locate the leak point. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0029] Figure 1 This is an overall structural diagram of the present invention when applied. Diagram a is the front view, diagram b is the right view of diagram a, and diagram AA is the cross-sectional view of diagram a.

[0030] Figure 2 Figure 1 is a schematic diagram of the outer shell structure in this invention, wherein Figure 2a is a front view of the assembled outer shell; and Figure 3b is a BB sectional view of Figure 2a.

[0031] Figure 3 This is a schematic diagram of the inner shell in this invention, wherein figure a is the front view, figure b is the right view of figure a, figure c is the sectional view of figure a along plane AA, figure d is the sectional view of figure a along plane BB, and figure e is the top view of figure a.

[0032] Figure 4This is a schematic diagram of the sealed airbag structure with colored smoke nozzle in this invention, wherein figure a is the front view of the sealed airbag; figure b is the right view of figure a; figure c is the AA section view of figure a; figure d is the BB section view of figure a; and figure e is the CC section view of figure a.

[0033] Figure 5 This is a schematic diagram of the sealed airbag structure of the colorless smoke nozzle in this invention, wherein figure a is the front view of the sealed airbag; figure b is the right view of figure a; figure c is the sectional view of figure a along plane AA; and figure d is the sectional view of figure a along plane BB.

[0034] The attached diagram is labeled as follows: 1. Outer shell; 2. Sealing airbag; 3. Arc groove one; 4. Arc groove two; 5. Cable plug; 6. Inner shell; 7. Arc groove three; 8. Expansion nozzle; 9. Colored smoke nozzle; 10. Nozzle channel; 11. Hand-tightening bolt; 12. Hand-tightening nut; 13. Pressure sensor; 14. Rubber cover; 15. Mounting hole. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0036] Example: Figure 1-5 This embodiment provides a protective sleeve for an underwater cable plug 5, including two outer shells 1 with openings and two arc-shaped sealing airbags 2. Each sealing airbag 2 has an inner shell 6 fixedly connected to its arc-shaped structure. The two outer shells 1 are fastened together to form a sealed protective shell, and the two sealing airbags 2 are fastened together to form a sealed protective bladder. Each outer shell 1, sealing airbag 2, and inner shell 6 has an arc-shaped groove 3, an arc-shaped groove 4, and an arc-shaped groove 7 at both ends. After fastening and installation, the arc-shaped grooves 3 and 4 at both ends of the outer shell 1, sealing airbag 2, and inner shell 6... The arc-shaped groove 7 forms an outer cable hole, a middle cable hole, and an inner cable hole respectively. After the protective sleeve is fastened and installed, the cables at both ends of the cable plug 5 will pass through the inner cable hole, the middle cable hole, and the outer cable hole in sequence. The installed cable plug 5 is placed between the two inner shells 6, the two inner shells 6 are placed between the two sealing airbags 2, and the two sealing airbags 2 are placed between the two outer shells 1. Each of the two sealing airbags 2 is equipped with an expansion nozzle 8, and one of the sealing airbags 2 is equipped with a colored smoke nozzle 9. Both the expansion nozzle 8 and the colored smoke nozzle 9 extend out of the protective shell.

[0037] After the two outer shells 1 are fastened together, three air nozzle channels 10 are provided on the outside. The three air nozzle channels 10 are used for the passage of two expansion air nozzles 8 and one colored smoke air nozzle 9. The air nozzle adopts the structure of automotive valve core. After inflation, it can automatically close to prevent gas from overflowing. The sealing airbag 2 can withstand a pressure of not less than 0.2 MPa.

[0038] The colored smoke nozzle 9 is located on the side of the sealed airbag 2 away from the inner shell 6. The colored smoke nozzle 9 penetrates the sealed airbag 2 and the inner shell 6. After the colored smoke enters the inner shell 6 through the colored smoke nozzle, it comes into contact with the cable connector and forms a certain pressure, which is about 0.1 MPa. In this way, when the protective bag leaks water, the colored smoke will leak out and bubble on the water surface, which serves as an alarm function.

[0039] A pressure sensor 13 is fixedly installed on the inner wall of the inner housing 6. The pressure sensor 13 is wirelessly connected to the external controller. When colored smoke is filled into the space between the two sealed airbags 2 at a pressure of about 0.1 MPa, the pressure sensor 13 will monitor this pressure. When the colored smoke leaks, the pressure decreases. After the pressure sensor 13 detects this, it will send the location information of the cable connector to the external display. In this way, the emergency personnel can quickly locate the leak point and reduce the investigation time.

[0040] The inner diameter of the middle cable hole is smaller than the outer diameter of the cable. In actual installation, the size of the middle cable hole is slightly smaller than the outer diameter of the cable. This allows the middle cable hole to fit tightly with the cable after installation, which helps improve the waterproof effect. The inner diameters of both the outer and inner cable holes are larger than the outer diameter of the middle cable. This allows the sealing airbag 2 to expand at the middle cable hole after inflation, without being restricted by the inner shell 6 and outer shell 1 that are attached to the sealing airbag 2. This tightly wraps the cable and provides better waterproof performance.

[0041] The two outer shells 1 are provided with mounting holes 15. After the two outer shells 1 are fastened together, they are locked by hand-tightening bolts 11 and hand-tightening nuts 12. The mounting holes 15, hand-tightening bolts 11 and hand-tightening nuts 12 enable the device to be quickly assembled and disassembled, and facilitate subsequent reuse, thus saving usage costs.

[0042] The inner shell 6 is adapted to the inner wall of the arc-shaped structure of the sealing airbag 2 and is fixedly connected to the inner wall of the arc-shaped structure of the sealing airbag 2. The sealing airbag 2 and the inner shell 6 can be connected by adhesive during the factory production. After the sealing airbag 2 is inflated, the inner shell 6 can restrict the sealing airbag 2 from expanding inward, so that the inflated airbag fills the gap between the inner and outer shells 1, thereby enhancing the sealing performance. On the other hand, it can ensure that there is a certain gap between the sealing airbag 2 and the cable connector, so that colored gas can be filled between the two sealing airbags 2. At the same time, it reserves space for the installation of the pressure sensor 13.

[0043] The expansion nozzle 8 and the colored smoke nozzle 9 are equipped with a removable rubber cover 14. The rubber cover 14 is made of high-performance engineering plastic injection molding, which has good resistance to acid, alkali, salt, corrosion, aging and ultraviolet rays. It has strong resistance to outdoor environment and plays a role in preventing mud and sand from clogging the nozzle.

[0044] The installation method and working principle of this embodiment are as follows:

[0045] First, after the rescue team arrives at the scene, the operator places the high-flow portable water pump in a suitable position. Another operator connects the cable plug 5 on the cable extension line to the water pump cable plug 5 and tightens its male and female threads. Then, the two sealing airbags 2 and the inner shell 6 are fastened and wrapped around the outside of the cable plug 5 to form a protective bag.

[0046] Then, the two outer shells 1 are fastened to the outside of the two sealing airbags 2 to form a protective shell. The mating surfaces of the two outer shells 1 and the mating surfaces of the two sealing airbags 2 are set at 90° perpendicularly. This can effectively prevent the sealing airbags 2 from being "squeezed out" along the mating surfaces of the outer shells 1 under pressure. The expansion nozzles 8 and colored smoke nozzles 9 of the sealing airbags 2 extend out of the protective shell through the corresponding nozzle channels 10. Then, the hand-tightening nuts 12 and hand-tightening bolts 11 on the mounting holes 15 are tightened, and the protective sleeve component is assembled.

[0047] After the components are assembled, use a handheld air pump to inflate and seal the two sealing airbags 2 through the expansion nozzle 8. The inflation pressure should not be less than 0.2 MPa. Since the sealing airbags 2 are slightly larger than the outer shell 1, they will expand inward and outward under pressure. The outer shell 1 and the inner shell 6 will restrict the expansion of the sealing airbags 2, so that the sealing airbags 2 tightly fill the protective space formed by the outer shell 1 and the inner shell 6. In particular, the joint surfaces of the two sealing airbags 2 overlap, and the fit is more airtight after inflation. The expansion of the cable hole in the middle will also tightly seal the cable, improving the waterproof effect. The expansion of the sealing airbags 2 can also effectively increase the pre-tightening force of the hand-tightened nuts 12 and hand-tightened bolts 11, and can also play a role in loosening.

[0048] Then, use a handheld air pump to fill the inner housing 6 with colored smoke at about 0.1 MPa through the colored smoke nozzle 9. The colored smoke serves to detect the sealing of the joint surfaces of the two sealing airbags 2 and the middle cable hole. At this time, the pressure sensor 13 will monitor the pressure of the colored smoke. Then, cover the nozzle end with the rubber cap 14. At this time, the protective cover is fully installed.

[0049] When in use, the sealed cable connector and its protective sleeve are placed in water. After a long period of underwater operation, if air leakage occurs, colored bubbles will be seen on the water surface, which serves as an alarm. At this time, the rescue personnel can determine that there is an air leakage in the connector, that is, the protective sleeve is not sealed properly, and there is a risk of leakage. The machine needs to be stopped for inspection, which improves the safety of the operation.

[0050] Meanwhile, rescue personnel can also check the pressure changes of pressure sensor 13 on the external display to determine if there is a leak, further ensuring the safety of the operation. After a leak is found, the rescue personnel need to investigate the leak point. Since the cable used in actual rescue is very long and many cable joints are used, it is necessary to check the location information of pressure sensor 13 with pressure changes, so as to quickly determine the specific location of the fault point and further improve work efficiency and safety.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A protective sleeve for an underwater cable plug, characterized in that, It includes two outer shells (1) with openings and two arc-shaped sealing airbags (2). The two outer shells (1) are fastened together to form a sealed protective shell, and the two sealing airbags (2) are fastened together to form a sealed protective bladder. The protective shells (1) have external cable holes at both ends, and the protective bladders have intermediate cable holes at both ends. Each sealing airbag (2) has an inner shell (6) inside its arc-shaped structure. When the two inner shells (6) are fastened together, their two ends form internal cable holes, through which the installed cable plugs ( 5) The inner shell (6) is placed between the two inner shells (6), the two inner shells (6) are placed between the two sealing airbags (2), the two sealing airbags (2) are placed between the two outer shells (1), the tail cable of the cable plug (5) passes through the inner cable hole, the middle cable hole and the outer cable hole in sequence, and each of the two sealing airbags (2) is provided with an expansion nozzle (8), and one of the sealing airbags (2) is provided with a colored smoke nozzle (9). The expansion nozzle (8) and the colored smoke nozzle (9) both extend out of the protective shell.

2. The underwater cable plug protective sleeve according to claim 1, characterized in that, The colored smoke nozzle (9) is located on the side away from the inner shell (6), and the colored smoke nozzle (9) penetrates the sealing airbag (2) and the inner shell (6).

3. The underwater cable plug protective sleeve according to claim 2, characterized in that, Each of the outer shell (1), sealing airbag (2) and inner shell (6) is provided with an arc groove one (3), an arc groove two (4) and an arc groove three (7) at both ends. The arc groove one (3), arc groove two (4) and arc groove three (7) at both ends of the outer shell (1), sealing airbag (2) and inner shell (6) respectively form an outer cable hole, a middle cable hole and an inner cable hole.

4. The underwater cable plug protective sleeve according to claim 3, characterized in that, After the two outer shells (1) are fastened together, three air nozzle channels (10) are provided on their exterior.

5. A protective sleeve for an underwater cable plug according to claim 3, characterized in that, The inner diameter of the intermediate cable hole is smaller than the outer diameter of the cable, while the inner diameters of the outer and inner cable holes are larger than the size of the intermediate cable hole.

6. The underwater cable plug protective sleeve according to claim 1, characterized in that, The two outer shells (1) are provided with mounting holes (15), and the two outer shells (1) are locked together by hand-tightening bolts (11) and hand-tightening nuts (12).

7. A protective sleeve for an underwater cable plug according to claim 1, characterized in that, The inner shell (6) is adapted to the inner wall of the arc-shaped structure of the sealing airbag (2) and is fixedly connected to the inner wall of the arc-shaped structure of the sealing airbag (2).

8. The underwater cable plug protective sleeve according to claim 1, characterized in that, A pressure sensor (13) is fixedly installed on the inner wall of the inner housing (6), and the pressure sensor (13) is wirelessly connected to an external controller.

9. A protective sleeve for an underwater cable plug according to claim 4, characterized in that, The expansion nozzle (8) and the colored smoke nozzle (9) pass through the corresponding nozzle channel (10) and extend out of the outer shell (1), and each of their extended ends is provided with a detachable rubber cap (14).

10. A method for installing an underwater cable plug protective sleeve, the method being based on the underwater cable plug protective sleeve according to any one of claims 1-8, characterized in that, Includes the following steps: S1: Connect the cable plugs (5) at both ends and tighten them with their own male and female threads. Then fasten the two sealing airbags (2) and the inner shell (6) around the outside of the cable plugs (5) to form a protective bag. S2: The two outer shells (1) are fastened to the outside of the two sealed airbags (2) to form a protective shell. The mating surfaces of the two outer shells (1) are set at 90° perpendicular to the mating surfaces of the two sealed airbags (2). The expansion nozzle (8) and the colored smoke nozzle (9) extend out of the outer protective shell through the corresponding nozzle channel (10). S3: Tighten the hand-tightening bolt (11) and hand-tightening nut (12) on the mounting hole (15); S4: Use a handheld air pump to inflate and seal the two sealing airbags (2) through the expansion nozzle (8). After the sealing airbags (2) are inflated, they will expand to the inside and outside. The outer shell (1) and the inner shell (6) will restrict the expansion of the sealing airbags (2), so that the sealing airbags (2) tightly fill the protective space formed by the outer shell (1) and the inner shell (6). S5: Use a handheld air pump to fill the inner shell (6) with colored smoke through the colored smoke nozzle (9) and create a certain pressure. The colored smoke serves to detect whether the joint surfaces of the two sealed airbags (2) and the middle cable hole are completely sealed.

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