A live inflation gas extraction device for a high voltage cable buffer layer and a method of use thereof

Abstract

The application discloses a kind of charged aerating gas taking device for high-voltage cable buffer layer and its application method, device uses buffer connecting mechanism, and high-pressure gas source, air supplement source and gas taking collection mechanism are communicated with cable buffer layer in parallel arrangement, pressure sensor is located in buffer main cavity and is used to detect the pressure in buffer main cavity, relative to the technical scheme of being arranged in pipeline, the pressure sensor arranged in buffer main cavity is not affected by the flow velocity of airflow, and the detected pressure value is more accurate, in line with reality.The device carries out insulation treatment to buffer main cavity and cable interface by insulation connecting piece, and the buffer main cavity does not need to be removed from the cable interface, and the aerating gas taking operation can also be carried out when the cable is running with electricity.The application simultaneously uses high-pressure gas source, air supplement source and gas taking collection mechanism to carry out aerating, air supplement and gas taking operation on cable buffer layer, to realize three kinds of operation once.

Description

Technical Field

[0001] This invention relates to the field of high-voltage cable maintenance device technology, and in particular to a live gas charging and sampling device for a high-voltage cable buffer layer and its application method. Background Technology

[0002] With the continuous growth of electricity demand, high-voltage cables play an increasingly important role in power transmission. The buffer layer of a high-voltage cable plays a crucial role in the cable's performance and lifespan.

[0003] Chinese Patent Publication No. CN113653945A discloses an inflation device and method for high-voltage cables. It includes a vacuuming structure and an inert gas filling structure connected in parallel, enabling inflation and deflation of the high-voltage cable. However, the applicant discovered that, on the one hand, because the vacuuming structure and the inert gas filling structure are directly connected to the cable joint via rubber pipes, and the pressure gauge or pressure sensor is mounted on the rubber pipes, the pressure gauge is affected by the airflow velocity during both inflation and vacuuming. The actual pressure data does not accurately reflect the actual pressure, ultimately leading to a deviation between the actual gas pressure inside the high-voltage cable and the theoretical pressure. On the other hand, this device can only perform inflation and deflation operations when the cable is not energized during cable laying. It needs to be removed when the cable is energized, making it impossible to perform inflation and deflation operations on energized cables. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a live gas charging and sampling device for high-voltage cable buffer layers with more accurate pressure measurement values.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A live gas charging and gas sampling device for a high-voltage cable buffer layer includes a buffer connection mechanism, a connecting pipe, a high-pressure gas source, a replenishing gas source, and a gas sampling and collection mechanism. The buffer connection mechanism is connected to the cable buffer layer. The connecting pipe includes a first pipe, a second pipe, and a third pipe arranged in parallel and operable to be opened or closed. The high-pressure gas source is connected to the buffer connection mechanism through the first pipe, the replenishing gas source is connected to the buffer connection mechanism through the second pipe, and the gas sampling and collection mechanism is connected to the buffer connection mechanism through the third pipe. The buffer connection mechanism includes a buffer main cavity, an insulating connector, and a pressure sensor. The pressure sensor is located in the buffer main cavity and is used to detect the pressure in the buffer main cavity. The insulating connector is located on the buffer main cavity and is connected to a cable joint. The buffer main cavity is connected to the cable buffer layer.

[0007] As a further improvement to the above technical solution:

[0008] The buffer connection mechanism also includes a replenishing valve, an air taking valve, and an inflation valve arranged in parallel on the buffer main cavity. The replenishing valve is used to open or close the second pipeline, the air taking valve is used to open or close the third pipeline, and the inflation valve is used to open or close the first pipeline.

[0009] The buffer connection mechanism also includes a pressure relief valve, which is located on the main buffer cavity.

[0010] The main buffer cavity is made of metal, and the insulating connector is made of insulating material.

[0011] The insulating connector includes an upper sealing tube, a connecting flange, and a lower sealing tube. The upper sealing tube and the lower sealing tube are connected by the connecting flange. The upper sealing tube is connected to a buffer connection mechanism, and the lower sealing tube is inserted into the cable connector.

[0012] The electrically charged gas extraction device also includes a solenoid valve for controlling the second pipeline.

[0013] The electrically charged gas intake device also includes a pressure reducing valve and a flow monitoring device, which are installed on the first pipeline, with the flow monitoring device located between the pressure reducing valve and the gas intake valve.

[0014] The electrically charged gas intake device also includes a pressure reducing valve and a flow monitoring device, which are installed on the second pipeline, with the flow monitoring device located between the pressure reducing valve and the gas supply valve.

[0015] The electrically charged gas extraction device also includes a controller, which is used to control the opening or closing of the connecting pipe and the gas extraction and collection mechanism.

[0016] As a general inventive concept, the present invention also provides a method for applying the aforementioned live gas charging and sampling device for high-voltage cable buffer layers, comprising at least one of a gas charging step, a gas sampling step, and a gas replenishment step:

[0017] The inflation process includes the following steps:

[0018] A1. Open the first pipe and pressurize the cable buffer layer with high-pressure air.

[0019] A2. Obtain pressure data within the buffer connection mechanism;

[0020] A3. Determine whether the pressure data has reached the preset pressure threshold. If so, close the first pipe; otherwise, continue to pressurize the cable buffer layer until the pressure data reaches the preset pressure threshold.

[0021] The gas extraction step includes the following steps:

[0022] B1. Open the third pipe and activate the gas collection mechanism to draw gas from the cable buffer layer;

[0023] B2. Obtain pressure data within the buffer connection mechanism;

[0024] B3. Determine whether the pressure data has reached the preset pressure threshold. If so, close the third pipeline and the gas collection mechanism. Otherwise, continue to collect gas from the cable buffer layer until the pressure data reaches the preset pressure threshold.

[0025] The qi replenishment step includes the following steps:

[0026] C1. Obtain pressure data within the buffer connection mechanism;

[0027] C2. Determine whether the pressure data has reached the preset pressure threshold. If yes, end the process; otherwise, proceed to step C3.

[0028] C3. Open the second pipe and supply air to the cable buffer layer. Proceed to step C1.

[0029] As a further improvement to the above technical solution:

[0030] The flow monitoring device is located between the pressure reducing valve and the air supply valve.

[0031] Compared with the prior art, the advantages of the present invention are as follows:

[0032] This invention discloses a live-line gas charging and sampling device for a high-voltage cable buffer layer. It employs a buffer connection mechanism to connect a parallel high-pressure gas source, a replenishing gas source, and a gas sampling and collection mechanism to the cable buffer layer. A pressure sensor is located within the main buffer cavity and is used to detect the pressure within it. Compared to a design where the pressure sensor is placed inside a pipe, the pressure sensor located within the main buffer cavity is not affected by airflow velocity, resulting in more accurate and realistic pressure readings. Simultaneously, the high-pressure gas source, the replenishing gas source, and the gas sampling and collection mechanism are used to charge, replenish, and sample the cable buffer layer, enabling three operations to be performed simultaneously. Furthermore, the main buffer cavity and the cable interface are insulated using insulating connectors, eliminating the need to remove the main buffer cavity from the cable interface and allowing for charging and sampling operations even when the cable is energized.

[0033] The application method of the live gas charging and gas sampling device for high-voltage cable buffer layer of the present invention uses the live gas charging and gas sampling device of the present invention, and has the aforementioned advantages. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the buffer connection mechanism in Embodiment 1 of the present invention.

[0035] Figure 2This is a top view of the buffer connection mechanism in Embodiment 1 of the present invention.

[0036] Figure 3 This is a side view of the buffer connection mechanism in Embodiment 1 of the present invention.

[0037] Figure 4 This is a schematic diagram of the state during inflation in Embodiment 1 of the present invention.

[0038] Figure 5 This is a schematic diagram of the state during the replenishment of Qi in Embodiment 1 of the present invention.

[0039] Figure 6 This is a schematic diagram of the state during gas extraction in Embodiment 1 of the present invention.

[0040] The labels in the diagram represent:

[0041] 1. Buffer connection mechanism; 101. Buffer main cavity; 102. Air replenishment valve; 103. Air intake valve; 104. Air filling valve; 105. Antenna; 106. Grounding interface; 107. Communication interface; 108. Power input interface; 109. Insulating connector; 110. Pressure sensor; 111. Pressure relief valve; 112. Solenoid valve; 191. Upper sealing pipe; 192. Connecting flange; 193. Lower sealing pipe; 2. High-pressure air source; 3. Air replenishment source; 4. Air intake and collection mechanism; 41. Air intake machine; 42. Gas collector; 5. Cable buffer layer; 6. Cable connector; 7. Pressure reducing valve; 701. First pipeline; 702. Second pipeline; 703. Third pipeline; 8. Flow monitoring device. Detailed Implementation

[0042] The present invention will be further described in detail below. Unless otherwise specified, the instruments or materials used in the present invention are commercially available.

[0043] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "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 invention 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 invention.

[0044] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] Example 1

[0047] like Figures 1 to 6 As shown, the live gas charging and gas extraction device for the high-voltage cable buffer layer in this embodiment includes a buffer connection mechanism 1, a connecting pipe, a high-pressure gas source 2, a replenishing gas source 3, and a gas extraction and collection mechanism 4. The buffer connection mechanism 1 is connected to the cable buffer layer 5. The connecting pipe includes a first pipe 701, a second pipe 702, and a third pipe 703 arranged in parallel and capable of being opened or closed. The high-pressure gas source 2 is connected to the buffer connection mechanism 1 through the first pipe 701, the replenishing gas source 3 is connected to the buffer connection mechanism 1 through the second pipe 702, and the gas extraction and collection mechanism 4 is connected to the buffer connection mechanism 1 through the third pipe 703. The buffer connection mechanism 1 includes a buffer main cavity 101, an insulating connector 109, and a pressure sensor 110. The pressure sensor 110 is located inside the buffer main cavity 101 and is used to detect the pressure of the buffer main cavity 101. The insulating connector 109 is located on the buffer main cavity 101 and is connected to the cable connector 6. The inner chamber of the buffer main cavity 101 is connected to the cable buffer layer 5. This invention employs a buffer connection mechanism 1, connecting the parallel-connected high-pressure gas source 2, replenishing gas source 3, and gas collection mechanism 4 to the cable buffer layer 5. A pressure sensor 110 is located within the buffer main cavity 101 and is used to detect the pressure within it. Compared to a design where the pressure sensor 110 is placed inside a pipe, the pressure sensor 110 located within the buffer main cavity 101 is not affected by airflow velocity, resulting in more accurate and realistic pressure readings. The high-pressure gas source 2 is a large gas cylinder used to inflate the cable during initial installation, requiring a relatively large amount of gas. The replenishing gas source 3 is a small gas cylinder used to replenish small amounts of gas after the cable is put into operation to address minor pressure changes. Since the buffer main cavity 101 needs to provide a certain buffering effect and have sufficient space, it is generally made of metal. The insulating properties of the insulating connector 109 provide insulation between the buffer main cavity 101 and the cable connector 6, enhancing pressure resistance. As the cable connector 6 is a cable accessory, the buffer main cavity 101 does not need to be removed from the cable accessory.

[0048] like Figure 1 , Figure 2 , Figure 3As shown, the buffer connection mechanism 1 also includes a replenishing air valve 102, an air taking air valve 103, and an inflation valve 104 arranged in parallel on the buffer main cavity 101. The replenishing air valve 102 is used to open or close the second pipeline 702, the air taking air valve 103 is used to open or close the third pipeline 703, and the inflation valve 104 is used to open or close the first pipeline 701. The buffer connection mechanism 1 of the present invention is made of metal and is installed on the cable accessory, with the same lifespan as the cable accessory. During subsequent air intake and exhaust operations, these valves (replenishing air valve 102, air taking air valve 103, and inflation valve 104) need to be manually operated. Compared with placing these valves on the pipeline, installing these valves on the buffer main cavity 101 is beneficial to ensuring the service life of these valves.

[0049] like Figure 1 , Figure 2 , Figure 3 As shown, the buffer connection mechanism 1 also includes a pressure relief valve 111, which is located on the main buffer cavity 101. When excessive air pressure is detected in the cable buffer layer 5, the pressure relief valve 111 is opened to release pressure.

[0050] like Figure 1 , Figure 2 , Figure 3 As shown, the insulating connector 109 includes an upper sealing tube 191, a connecting flange 192, and a lower sealing tube 193. The upper sealing tube 191 and the lower sealing tube 193 are connected by the connecting flange 192. The upper sealing tube 191 is connected to the buffer connection mechanism 1, and the lower sealing tube 193 is inserted into the cable connector 6. In this embodiment, the lower sealing tube 193 is part of the cable connector 6, and the two are sealed together. Since the cable sheath and the inside of the device contain high-pressure gas, the connecting flange 192 is used to connect the buffer main cavity 101 into one unit, which is safe and reliable.

[0051] like Figure 5 As shown, the electrically charged air intake device also includes a solenoid valve 112 for controlling the second pipe 702. The air replenishment valve 102 is a manual switch, which is convenient for on-site operation during initial installation or major overhaul; the solenoid valve 112 can be remotely controlled, which is convenient for online monitoring and automatic air replenishment. In this embodiment, the solenoid valve 112 is connected to the internal control circuit of the buffer main cavity 101 and is an integral part of the buffer main cavity 101. The second pipe 702 and other components outside the buffer main cavity 101 can be removed after inflation.

[0052] like Figure 4 , Figure 5As shown, the electrically charged gas charging and extraction device also includes a pressure reducing valve 7 and a flow monitoring device 8. These devices stabilize pressure and monitor flow rate during gas replenishment or charging. Specifically, during charging, the pressure reducing valve 7 and flow monitoring device 8 are installed on the first pipe 701, with the flow monitoring device 8 located between the pressure reducing valve 7 and the charging valve 104. During gas replenishment, the pressure reducing valve 7 and flow monitoring device 8 are installed on the second pipe 702, with the flow monitoring device 8 located between the pressure reducing valve 7 and the replenishing valve 102. In this embodiment, two sets of pressure reducing valves 7 and flow monitoring devices 8 are used, respectively installed on the first pipe 701 and the second pipe 702.

[0053] The electrically charged gas extraction device also includes a controller (not shown in the figure), which controls the opening and closing of the connecting pipes (first pipe 701, second pipe 702, and third pipe 703) and the gas extraction and collection mechanism 4. In this embodiment, the controller controls the opening and closing of each valve to control the connecting pipes. At the same time, the controller is also responsible for the data collection and processing of the pressure sensor 110.

[0054] like Figure 1 , Figure 2 , Figure 3 As shown, in this embodiment, the buffer main cavity 101 is also equipped with an antenna 105, a grounding interface 106, a communication interface 107, and a power supply interface 108. The solenoid valve 112 is located inside the buffer main cavity 101. Therefore, these electrical components are installed on the buffer main cavity 101 to facilitate controller control of the solenoid valve 112. The antenna 105 is a 4G communication antenna for uploading monitoring data and remotely controlling gas replenishment. The grounding interface 106 is a grounding terminal because the metal part of the buffer main cavity 101 is insulated from the metal outer shell of the cable accessories, requiring a grounding wire. The communication interface 107 facilitates connection to a handheld device to view monitoring data during on-site operation. The power supply interface 108 is a CT power socket for the device's power supply.

[0055] like Figure 6 As shown, the gas collection mechanism 4 includes a gas extractor 41 and a gas collector 42. The gas extractor 41 is connected to the buffer main chamber 101 through a third pipe 703, and extracts the gas in the buffer main chamber 101 and delivers it to the gas collector 42. The controller controls the opening and closing of the gas extractor 41.

[0056] Example 2

[0057] This embodiment describes an application method using the live-line gas charging and sampling device for high-voltage cable buffer layers according to Embodiment 1. The gas charging step is performed during construction before the cable is put into operation and includes the following steps:

[0058] A1. Open the first pipe 701 and pressurize the cable buffer layer 5 with air from the high-pressure air source 2.

[0059] A2. Obtain pressure data within the buffer connection mechanism 1;

[0060] A3. Determine whether the pressure data has reached the preset pressure threshold. If so, close the first pipe 701. Otherwise, continue to pressurize the cable buffer layer 5 until the pressure data reaches the preset pressure threshold.

[0061] Example 3

[0062] This embodiment describes an application method using the live gas sampling device for high-voltage cable buffer layers from Embodiment 1. The method includes a sampling step, which involves manually performing gas extraction analysis at regular intervals throughout the cable's lifespan. The steps include:

[0063] B1. Open the third pipe 703 and activate the gas collection mechanism 4 to draw gas from the cable buffer layer 5.

[0064] B2. Obtain pressure data within buffer connection mechanism 1;

[0065] B3. Determine whether the gas pressure data has reached the preset pressure threshold. If so, close the third pipe 703 and the gas collection mechanism 4. Otherwise, continue to draw gas from the cable buffer layer 5 until the pressure data reaches the preset pressure threshold.

[0066] In this embodiment, the gas collected by the gas collector 42 can be analyzed to understand the condition of the cable buffer layer 5, providing a basis for the operation and maintenance of the cable.

[0067] Example 4

[0068] This embodiment describes an application method of the live gas charging and sampling device for high-voltage cable buffer layers using the device described in Embodiment 1. The method includes a gas replenishment step, where the device automatically adjusts the gas replenishment based on real-time monitored gas pressure data after the cable is put into operation. The steps include:

[0069] C1. Obtain pressure data within the buffer connection mechanism 1;

[0070] C2. Determine whether the pressure data has reached the preset pressure threshold. If yes, end the process; otherwise, proceed to step C3.

[0071] C3. Open the second pipe 702, and supply air source 3 to supply air into the cable buffer layer 5. Then execute step C1.

[0072] Example 5

[0073] This embodiment describes an application method using the live gas charging and gas sampling device for high-voltage cable buffer layers according to Embodiment 1, which includes a gas sampling step and a gas replenishment step, the two steps being performed simultaneously.

[0074] A computer-readable storage medium storing a computer program or instructions that are programmed or configured to execute an application method according to Embodiments 2, 3, 4, and 5 by a processor.

[0075] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The present invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, produce implementations of the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 The computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The functions specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0076] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A live gas charging and sampling device for a high-voltage cable buffer layer, characterized in that: The system includes a buffer connection mechanism (1), a connecting pipe, a high-pressure gas source (2), a replenishing gas source (3), and a gas collection mechanism (4). The buffer connection mechanism (1) is connected to the cable buffer layer (5). The connecting pipe includes a first pipe (701), a second pipe (702), and a third pipe (703) that are connected in parallel and can be opened or closed. The high-pressure gas source (2) is connected to the buffer connection mechanism (1) through the first pipe (701). The replenishing gas source (3) is connected to the buffer connection mechanism (1) through the second pipe (702). The gas collection mechanism (4)... Structure (4) is connected to buffer connection mechanism (1) through third pipe (703); the buffer connection mechanism (1) includes buffer main cavity (101), insulating connector (109) and pressure sensor (110). The pressure sensor (110) is located inside the buffer main cavity (101) and is not set in the connecting pipe. It is used to detect the pressure of the buffer main cavity (101). The insulating connector (109) is located on the buffer main cavity (101) and connected to the cable connector (6). The buffer main cavity (101) is connected to the cable buffer layer (5).

2. The electrically charged gas extraction device according to claim 1, characterized in that: The buffer connection mechanism (1) further includes a replenishing valve (102), an air taking valve (103), and an inflation valve (104) arranged in parallel on the buffer main cavity (101). The replenishing valve (102) is used to open or close the second pipeline (702), the air taking valve (103) is used to open or close the third pipeline (703), and the inflation valve (104) is used to open or close the first pipeline (701).

3. The electrically charged gas extraction device according to claim 2, characterized in that: The buffer connection mechanism (1) also includes a pressure relief valve (111), which is located on the main buffer cavity (101).

4. The electrically charged gas extraction device according to claim 2, characterized in that: The buffer main cavity (101) is made of metal, and the insulating connector (109) is made of insulating material.

5. The electrically charged gas extraction device according to claim 1, characterized in that: The insulating connector (109) includes an upper sealing tube (191), a connecting flange (192) and a lower sealing tube (193). The upper sealing tube (191) and the lower sealing tube (193) are connected by the connecting flange (192). The upper sealing tube (191) is connected to the buffer connection mechanism (1), and the lower sealing tube (193) is inserted into the cable connector (6).

6. The electrically charged gas extraction device according to claim 1, characterized in that: The electrically charged gas extraction device also includes a solenoid valve (112) for controlling the second pipeline (702).

7. The electrically charged gas extraction device according to claim 1, characterized in that: The electrically charged gas-taking device also includes a pressure reducing valve (7) and a flow monitoring device (8), which are installed on the first pipeline (701). The flow monitoring device (8) is located between the pressure reducing valve (7) and the gas-charging valve (104).

8. The electrically charged gas extraction device according to claim 1, characterized in that: The electrically charged gas-taking device also includes a pressure reducing valve (7) and a flow monitoring device (8). The pressure reducing valve (7) and the flow monitoring device (8) are installed on the second pipeline (702). The flow monitoring device (8) is located between the pressure reducing valve (7) and the gas replenishment valve (102).

9. The electrically charged gas extraction device according to claim 1, characterized in that: The electrically charged gas extraction device also includes a controller, which is used to control the opening or closing of the connecting pipe and the gas collection mechanism (4).

10. A method for applying the live gas charging and sampling device for a high-voltage cable buffer layer according to any one of claims 1 to 9, characterized in that: Includes at least one of the following steps: inflation, deflation, and refill: The inflation process includes the following steps: A1. Open the first pipe (701) and pressurize the cable buffer layer (5) with high-pressure air source (2); A2. Obtain the internal pressure data of the buffer connection mechanism (1); A3. Determine whether the pressure data has reached the preset pressure threshold. If so, close the first pipe (701). Otherwise, continue to fill the cable buffer layer (5) with air until the pressure data reaches the preset pressure threshold. The gas extraction step includes the following steps: B1. Open the third pipe (703) and turn on the gas collection mechanism (4) to collect gas from the cable buffer layer (5); B2. Obtain the internal pressure data of the buffer connection mechanism (1); B3. Determine whether the pressure data has reached the preset pressure threshold. If so, close the third pipe (703) and the gas collection mechanism (4). Otherwise, continue to collect gas from the cable buffer layer (5) until the pressure data reaches the preset pressure threshold. The qi replenishment step includes the following steps: C1. Obtain the internal pressure data of the buffer connection mechanism (1); C2. Determine whether the pressure data has reached the preset pressure threshold. If yes, end the process; otherwise, proceed to step C3. C3. Open the second pipe (702), and replenish the air source (3) to replenish the air into the cable buffer layer (5). Then execute step C1.

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