A pipe plugging device for a reactor

Abstract

The application relates to the reactor technical field and provides a pipe blocking device for a reactor. The reactor comprises in-reactor equipment, out-reactor equipment, a reactor pool and in-reactor pipes. The in-reactor equipment is arranged in the reactor pool. The in-reactor pipes are filled with water. The in-reactor pipes are communicated with the reactor pool and the out-reactor equipment. The pipe blocking device comprises an extrusion assembly and a sealing piece. The extrusion assembly is formed with an extrusion groove with adjustable volume. The part of the extrusion assembly formed with the extrusion groove is arranged in the in-reactor pipes. The sealing piece is arranged in the extrusion groove. The volume of the extrusion groove is adjusted. The sealing piece is deformed to seal the gap between the extrusion assembly and the in-reactor pipes. The pipe blocking device for the reactor can block the in-reactor pipes.

Description

Technical Field

[0001] This application relates to the field of reactor technology, and more particularly to a pipeline plugging device for reactors. Background Technology

[0002] In related technologies, reactor equipment is usually submerged in pool water, while external equipment is connected to the reactor equipment and pool water through internal pipelines. Because the internal pipelines are constantly filled with water, it is difficult to repair and replace the external equipment. Summary of the Invention

[0003] In view of this, embodiments of this application aim to provide a pipeline plugging device for a reactor, capable of plugging pipelines within the reactor.

[0004] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0005] This application discloses a pipeline plugging device for a reactor. The reactor includes in-reactor equipment, external equipment, a reactor water pool, and in-reactor pipelines. The in-reactor equipment is disposed within the reactor water pool, and the in-reactor pipelines are filled with water. The in-reactor pipelines connect the reactor water pool and the external equipment. The pipeline plugging device includes:

[0006] An extrusion assembly having an adjustable-volume extrusion groove, wherein the portion of the extrusion assembly having the extrusion groove is disposed in the in-stack pipeline;

[0007] A sealing element is disposed within the extrusion groove. The volume of the extrusion groove is adjusted to deform the sealing element to seal the gap between the extrusion assembly and the in-stack piping.

[0008] In one embodiment, the extrusion assembly includes a sleeve and an extruder. The sleeve has a guide channel extending through its lower end face. The extruder includes a slide rod and a stop connected to the slide rod. At least a portion of the slide rod is movably disposed within the guide channel. The stop is located below the sleeve. The upper end face of the stop, the outer peripheral surface of the slide rod, and the lower end face of the sleeve together define the extrusion groove. The extruder and the sleeve move relative to each other in a vertical direction to adjust the volume of the extrusion groove.

[0009] In one embodiment, the extrusion assembly includes an adjusting member that is sleeved on the outer periphery of the slide rod and threadedly engaged with the slide rod. The adjusting member and the extrusion member rotate relative to each other, so that the extrusion member moves relative to the sleeve in a vertical direction.

[0010] In one embodiment, the adjusting member includes a threaded portion and a blocking portion connected to the threaded portion. The blocking portion is connected to the outer periphery of the threaded portion. The upper end face of the sleeve has an opening communicating with the guide channel. The threaded portion extends into the opening of the sleeve and is threadedly engaged with the upper end of the slide rod. The lower surface of the blocking portion abuts against the upper end face of the sleeve.

[0011] In one embodiment, there are multiple seals, and the multiple seals are arranged in a vertical direction.

[0012] In one embodiment, the compression assembly includes a movable pressure block, with one pressure block disposed between two adjacent seals.

[0013] In one embodiment, the pipeline sealing device includes an inflation assembly, and the extrusion assembly forms an inflation channel. When the seals seal the gap between the extrusion assembly and the pipeline in the stack, the sealing space between two adjacent seals is a detection space. The inflation assembly inflates gas into the detection space through the inflation channel to detect the airtightness of the seals.

[0014] In one embodiment, the extrusion assembly includes a sleeve and an extruder. The sleeve has a guide channel extending through its lower end face. The extruder includes a slide rod and a stop connected to the slide rod. At least a portion of the slide rod is movably disposed within the guide channel. The stop is located below the sleeve. The upper end face of the stop, the outer peripheral surface of the slide rod, and the lower end face of the sleeve together define the extrusion groove. A cavity is formed inside the extruder. A through hole is formed on the peripheral side of the extruder. A connecting groove is formed on the peripheral side of the extruder. The cavity, the through hole, and the connecting groove together constitute the inflation channel.

[0015] In one embodiment, the inflation assembly includes an inflation pipe, a switching valve, and an air pump. The inflation pipe connects the air pump and the inflation channel, and the switching valve is disposed on the inflation pipe to selectively open or close the inflation pipe.

[0016] In one embodiment, the inflation assembly includes a pressure gauge disposed on the inflation pipe for detecting the gas pressure in the detection space.

[0017] This application discloses a pipeline sealing device for a reactor. When external equipment needs maintenance or replacement, the part of the extrusion assembly with the extrusion groove is lowered into the internal pipeline. By adjusting the volume of the extrusion groove, the sealing element is compressed and deformed, ultimately sealing the gap between the extrusion assembly and the internal pipeline. This achieves the sealing of the internal pipeline. On the one hand, the sealing prevents water from flowing into the reactor water pool, facilitating on-site maintenance and / or replacement. On the other hand, the sealing prevents water from flowing out of the reactor, reducing radiation damage to personnel. Attached Figure Description

[0018] Figure 1 An embodiment of this application provides a pipeline plugging device for a reactor, wherein the portion of the extrusion assembly having the extrusion groove is disposed in the in-reactor pipeline;

[0019] Figure 2 for Figure 1 Enlarged view of point B in the image.

[0020] Explanation of reference numerals in the attached figures

[0021] Piping plugging device 100 for reactor; extrusion assembly 1; extrusion groove 1a; sleeve 11; guide channel 11a; outlet 11b; opening 11c; extrusion piece 12; cavity 12a; through hole 12b; slide rod 121; stop block 122; adjusting piece 13; threaded part 131; blocking part 132; pressure block 14; connecting groove 14a; sealing piece 2; first sealing piece 21; second sealing piece 22; gas filling assembly 3; gas filling pipe 31; switch valve 32; pressure gauge 33; reactor 200; reactor water pool 201; internal pipeline 202; water surface A. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0023] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. The terms "first," "second," etc., used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly including at least one feature. In the description of the embodiments of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] Repair and / or replacement of off-site equipment must be carried out under the condition that water in the reactor pool does not continuously enter the in-core pipelines. Due to the structure and safety limitations of the reactor, the water in the reactor pool cannot be completely drained, and there are no valves to isolate the in-core pipelines. Therefore, replacement and / or repair are quite difficult.

[0025] In view of this, this application provides a pipeline plugging device 100 for reactors. Please refer to [link to relevant documentation]. Figure 1 and Figure 2 The reactor 200 includes in-core equipment, out-of-core equipment, reactor water pool 201, and in-core piping 202. The in-core equipment is located in the reactor water pool 201, and the in-core piping 202 is filled with water. The in-core piping 202 connects the reactor water pool 201 and the out-of-core equipment.

[0026] The pipeline sealing device 100 includes a compression assembly 1 and a sealing element 2. The compression assembly 1 has an adjustable-volume compression groove 1a, and the portion of the compression assembly 1 with the compression groove 1a is disposed in the in-core pipeline 202. The sealing element 2 is disposed within the compression groove 1a, and adjusting the volume of the compression groove 1a causes the sealing element 2 to deform to seal the gap between the compression assembly 1 and the in-core pipeline 202.

[0027] The pipeline sealing device 100 for reactors provided in this application embodiment, when it is necessary to repair and replace external equipment, lowers the part of the extrusion assembly 1 with the extrusion groove 1a into the in-reactor pipeline 202. By adjusting the size of the extrusion groove 1a, the sealing element 2 is extruded and deformed, ultimately sealing the gap between the extrusion assembly 1 and the in-reactor pipeline 202. In this way, the in-reactor pipeline 202 can be sealed. On the one hand, the sealing of the in-reactor pipeline 202 prevents the water in the reactor pool 201 from continuing to flow into the in-reactor pipeline 202, facilitating on-site repair and / or replacement work by personnel. On the other hand, the sealing of the in-reactor pipeline 202 prevents the water in the reactor 200 from continuing to flow out, thus reducing radiation damage to personnel.

[0028] It should be noted that the numerous in-core devices within the reactor water pool 201 and the small diameter of the in-core pipeline 202 (e.g., 58mm) result in limited operational space for the in-core pipeline 202. Furthermore, the in-core pipeline 202 is highly radioactive, making it impossible for personnel to operate on-site.

[0029] It should be noted that in-pile equipment refers to equipment inside the sump 201, while out-of-pile equipment refers to equipment outside the sump 201.

[0030] For example, in one embodiment, a confined space is formed below the reactor 200, and external equipment is disposed within the confined space. One end of the in-reactor piping 202 within the reactor water pool 201 has an opening. The external equipment includes piping assemblies and a control rod drive mechanism. The piping assembly is disposed within the confined space and communicates with the in-reactor piping 202. The reactor 200 includes control rods and drive rods. The control rods are disposed within the reactor water pool 201, and the drive rods are disposed within the in-reactor piping 202. The drive rods extend through the opening and connect to the control rods. The drive mechanism of the control rods has an electromagnetic coil. The electromagnetic coil is sleeved on the outer periphery of the in-reactor piping 202. The electromagnetic coil is magnetically connected to the drive rod. The electromagnetic coil moves up and down, thereby driving the drive rod to move up and down, thereby adjusting the up and down movement of the control rods, and thus controlling the power operation of the reactor 200. When it is necessary to repair or replace the external equipment, the in-reactor piping 202 must be sealed first before the piping assembly can be disassembled, and finally the electromagnetic coil can be removed.

[0031] It should be noted that the in-reactor piping 202 is open at one end within the reactor water pool 201. This presents two problems: First, if the in-reactor piping 202 is not sealed during maintenance or replacement of external equipment, the pool water in the reactor 200 will continuously flow down into the confined space through the in-reactor piping 202, making maintenance impossible and posing a radiation hazard to personnel. Second, if the in-reactor piping 202 is sealed within the confined space, the external equipment must be disassembled before sealing. During the sealing process, the pool water in the reactor 200 will continuously flow into the confined space through the in-reactor piping 202, also resulting in maintenance difficulties.

[0032] For example, in one embodiment, there is a certain gap between the extrusion assembly 1 and the in-pile pipeline 202, so that the extrusion assembly 1 can be lowered to a set position in the in-pile pipeline 202 and extracted from the in-pile pipeline 202.

[0033] In one embodiment, please refer to Figure 1 and Figure 2 The extrusion assembly 1 includes a sleeve 11 and an extruder 12. The sleeve 11 has a guide channel 11a extending through its lower end face. The extruder 12 includes a slide rod 121 and a stop 122 connected to the slide rod 121. Exemplarily, the shapes of the sleeve 11 and the extruder 12 are not limited; for example, both the sleeve 11 and the extruder 12 can be cylindrical structures. The sleeve 11 can be an outer tube, and the extruder 12 can be an inner tube, with the inner tube fitted inside the outer tube. At least a portion of the slide rod 121 is movably disposed within the guide channel 11a. Exemplarily, there is a certain gap between the slide rod 121 and the sleeve 11, which allows relative movement between the slide rod 121 and the sleeve 11.

[0034] Please see Figure 2 The stop block 122 is located below the sleeve 11. The upper end face of the stop block 122, the outer peripheral surface of the slide rod 121, and the lower end face of the sleeve 11 together define the extrusion groove 1a. For example, the lower end face of the sleeve 11 forms an outlet 11b, which communicates with the guide channel 11a. A portion of the slide rod 121 can extend out of the outlet 11b. The stop block 122 can be disposed on the outer periphery of the extended portion of the slide rod 121; specifically, the stop block 122 can be disposed on the outer periphery of the end of the extended portion of the slide rod 121. The stop block 122 extends towards the inner wall of the in-pile pipe 202, so that the stop block 122 can block the seal 2 from below, preventing the seal 2 from dislodging. Thus, the surface of the stop block 122 near the sleeve 11, the outer peripheral surface of the extended portion of the slide rod 121, and the lower end face of the sleeve 11 together define the extrusion groove 1a.

[0035] The extrusion member 12 and the sleeve 11 move relative to each other in the vertical direction to adjust the volume of the extrusion groove 1a. By moving the extrusion member 12 vertically, the slide rod 121 moves within the guide channel 11a, thereby causing the stop block 122 to move closer to or further away from the lower end face of the sleeve 11. This increases or decreases the volume of the extrusion groove 1a. When maintenance or replacement of off-site equipment is required, the extrusion assembly 1 can be lowered into the in-site piping 202. Then, by moving the extrusion member 12 upwards to reduce the volume of the extrusion groove 1a, the surface of the stop block 122 near the sleeve 11 and the lower end face of the sleeve 11 will press against the upper and lower surfaces of the seal 2, causing it to expand and deform. This ensures the seal... A portion of the seal 2 will fit tightly against the bottom surface of the extrusion groove 1a, while the other portion of the seal 2 will protrude from the extrusion groove 1a and contact the inner wall of the in-core pipeline 202, thus sealing the in-core pipeline 202. This facilitates operation by personnel. After maintenance is completed, the extrusion component 12 can be moved downward to increase the volume of the extrusion groove 1a. At this time, the seal 2 will recover its deformation and retract into the extrusion groove 1a to reduce the adhesion of the seal 2 to the inner wall of the in-core pipeline 202. In this way, the extrusion assembly 1 can be extracted from the in-core pipeline 202, completing the recycling of the extrusion assembly 1 efficiently and conveniently.

[0036] As an example, in one embodiment, please refer to Figure 1 The portion of the extrusion piece 12 is exposed above the water surface A of the water tank 201. In this way, the portion of the extrusion piece 12 exposed above the water surface A can be moved relative to the sleeve 11 in the vertical direction to adjust the volume of the extrusion groove 1a, thereby reducing radiation damage to workers and ensuring high safety.

[0037] For example, in one embodiment, the in-core pipeline 202 has an in-core interface near the outgoing part of the in-core equipment. The pipeline sealing device 100 can extend into the in-core interface to seal it. In this way, sealing at the in-core interface can prevent the water pressure in the in-core pipeline 202 from rising too quickly, thereby ensuring the safe operation of the in-core pipeline 202 and the structural stability of the pipeline inner wall.

[0038] For example, in one embodiment, the extrusion assembly 1 can be hoisted into the in-pile pipeline 202 by a crane or the like. After being lowered to the target sealing position, the sleeve 11 is then fixed so that when the extrusion assembly 12 moves, the sleeve 11 does not move with it, so as to generate relative movement and facilitate adjustment of the volume of the extrusion groove 1a.

[0039] In one embodiment, please refer to Figure 1 The extrusion assembly 1 includes an adjusting member 13, which is sleeved on the outer periphery of the slide rod 121 and threadedly engaged with the slide rod 121. The adjusting member 13 and the extrusion member 12 rotate relative to each other, so that the extrusion member 12 moves vertically relative to the sleeve 11. Here, the vertical movement of the extrusion member 12 is achieved by a threaded engagement. On the one hand, the thread adopts a helical engagement, which can withstand higher loads and has higher movement accuracy; on the other hand, the threaded engagement can generate a large engagement friction between the adjusting member 13 and the slide rod 121, thereby reducing vibration and noise during movement and rotation, and making the transmission smoother; the threaded engagement has a self-locking characteristic, making it less prone to slippage and loss of position, thus effectively preventing loss of control when extruding the sealing member 2.

[0040] In one embodiment, please refer to Figure 1 The adjusting member 13 includes a threaded portion 131 and a blocking portion 132 connected to the threaded portion 131, the blocking portion 132 being connected to the outer periphery of the threaded portion 131. Exemplarily, the shapes of the blocking portion 132 and the threaded portion 131 are not limited; for example, the threaded portion 131 can be cylindrical, and the blocking portion 132 can be disc-shaped, with the blocking portion 132 sleeved around the outer periphery of the threaded portion 131. The upper end face of the sleeve 11 forms an opening 11c communicating with the guide channel 11a. The threaded portion 131 extends into the opening 11c of the sleeve 11 and is threadedly engaged with the upper end of the slide rod 121. The lower surface of the blocking portion 132 abuts against the upper end face of the sleeve 11. When the threaded part 131 is screwed in downwards, the blocking part 132 prevents the threaded part 131 from moving downwards. At this time, the slide rod 121 will move upwards in the spiral direction, thereby driving the stop block 122 closer to the lower end face of the sleeve 11 to reduce the volume of the extrusion groove 1a, thereby extruding the seal 2. When the threaded part 131 is screwed out upwards, the slide rod 121 slowly disengages from the threaded part 131. At this time, the slide rod 121 begins to move downwards under the action of gravity, thereby driving the stop block 122 away from the lower end face of the sleeve 11 to increase the volume of the extrusion groove 1a, thereby allowing the seal 2 to recover its deformation.

[0041] For example, in one embodiment, the threaded engagement between the threaded portion 131 and the slide rod 121 can be such that an adjustment port is formed at the upper end of the slide rod 121, an internal thread is formed in the adjustment port, and an external thread is formed on the outer periphery of the threaded portion 131; or an adjustment port is formed in the threaded portion 131, an internal thread is formed in the adjustment port, and an external thread is formed on the outer periphery of the slide rod 121.

[0042] In one embodiment, please refer to Figure 2 The number of seals 2 is multiple, and the multiple seals 2 are arranged in a vertical direction. For example, the number of seals 2 is not limited; for example, there can be two, namely a first seal 21 and a second seal 22, with the first seal 21 located above the second seal 22. In this way, the sealing performance of the in-core pipeline 202 can be improved by using multiple seals 2, resulting in a good sealing effect.

[0043] In one embodiment, please refer to Figure 1 and Figure 2 The compression assembly 1 includes a movable compression block 14. Exemplarily, the shape of the compression block 14 is not limited; for example, the compression block 14 can be annular and sleeved around the outer periphery of the slide rod 121. A compression block 14 is disposed between two adjacent seals 2. Exemplarily, taking two seals 2 as an example, when the volume of the compression groove 1a decreases, the lower end face of the sleeve 11 and the upper surface of the compression block 14 will compress the first seal 21, and the upper surface of the stop block 122 and the lower surface of the compression block 14 will compress the second seal 22. This allows for better deformation and expansion of each seal 2, improving the sealing of the in-core pipeline 202 and achieving a good sealing effect.

[0044] In one embodiment, please refer to Figure 1 The pipeline sealing device 100 includes an inflation assembly 3 and an extrusion assembly 1 with an inflation channel. With the seal 2 sealing the gap between the extrusion assembly 1 and the pipeline 202 within the stack, the sealing space between two adjacent seals 2 serves as a detection space. The inflation assembly 3 injects gas into the detection space through the inflation channel to test the airtightness of the seal 2. For example, the inflation assembly 3 can be positioned on top of the extrusion assembly 1. This allows for the detection and monitoring of the sealing effect of the seal 2, ensuring the safe conduct of subsequent maintenance and replacement work.

[0045] In one embodiment, please refer to Figure 1 and Figure 2The extrusion assembly 1 includes a sleeve 11 and an extruder 12. The sleeve 11 has a guide channel 11a extending through its lower end face. The extruder 12 includes a slide rod 121 and a stop block 122 connected to the slide rod 121. At least a portion of the slide rod 121 is movably disposed within the guide channel 11a. The stop block 122 is located below the sleeve 11. The upper end face of the stop block 122, the outer peripheral surface of the slide rod 121, and the lower end face of the sleeve 11 together define an extrusion groove 1a. A cavity 12a is formed inside the extruder 12. A through hole 12b is formed on the peripheral side of the extruder 12. A connecting groove 14a is formed on the peripheral side of the pressure block 14. The cavity 12a, the through hole 12b, and the connecting groove 14a together constitute an inflation channel. For example, an air inlet is formed on the upper end face of the extrusion member 12, which is connected to the cavity 12a. The air inlet assembly 3 is connected to the air inlet. In this way, when the seal member 2 seals the gap between the extrusion assembly 1 and the internal pipeline 202, gas is injected into the air inlet through the air inlet assembly 3. The gas reaches the detection space through the cavity 12a, the through hole 12b and the connecting groove 14a to detect the sealing effect of the seal member 2. By forming the connecting groove 14a on the side of the outer periphery of the pressure block 14, not only can the seal member 2 be extruded, but the gas can also be transported from one side of the pressure block 14 to the other side through the connecting groove 14a to improve the accuracy of the sealing detection.

[0046] In one embodiment, please refer to Figure 1 The inflation assembly 3 includes an inflation pipe 31, a switch valve 32, and an air pump. The inflation pipe 31 connects the air pump and the inflation channel. The switch valve 32 is installed on the inflation pipe 31 to selectively open or close the inflation pipe 31. For example, with the seal 2 sealing the gap between the compression assembly 1 and the in-core pipeline 202, the switch valve 32 is opened, and gas is injected into the detection space through the air pump. After the air pressure in the detection space is increased to a preset pressure, the switch valve 32 is closed to confirm that the airtightness of the seal 2 meets the requirements. For example, after the air pressure in the detection space is increased to a preset pressure, it can be observed within a preset time whether bubbles are generated on the water surface A. If bubbles are generated, the volume of the compression groove 1a needs to be further reduced. If no bubbles are generated, the maintenance and replacement of the external equipment can be carried out.

[0047] For example, in one embodiment, the airtightness can also be determined by observing the preset pressure. If the preset pressure remains unchanged within a preset time, it can also indicate that the airtightness is good. For example, the preset pressure can be 0.15 MPa and the preset time can be 30 minutes. That is to say, if the preset pressure is always maintained at 0.15 MPa within 30 minutes, it indicates that the airtightness meets the requirements.

[0048] In one embodiment, please refer to Figure 1The inflation assembly 3 includes a pressure gauge 33, which is installed on the inflation pipe 31 to detect the gas pressure in the detection space. This allows for high accuracy in obtaining pressure values ​​via the pressure gauge 33, and avoids electromagnetic interference and other hazardous factors during measurement, resulting in more accurate measurements.

[0049] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. All modifications, equivalent substitutions, improvements, etc., within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A line blanking device for a reactor, characterized in that, The reactor comprises in-pile equipment, out-of-pile equipment, a reactor pool and in-pile pipelines, the in-pile equipment is arranged in the reactor pool, the in-pile pipelines are filled with water, the in-pile pipelines are communicated with the reactor pool and the out-of-pile equipment, and the pipeline blocking device comprises: a pressing assembly, the pressing assembly is formed with a pressing groove with adjustable volume, and a part of the pressing assembly formed with the pressing groove is arranged in the in-pile pipeline; seals, the seals are arranged in the pressing groove, the volume of the pressing groove is adjusted, the seals are deformed to seal the gap between the pressing assembly and the in-pile pipeline, and the number of the seals is multiple, and the multiple seals are arranged in the up-down direction; an inflation assembly, the pressing assembly is formed with an inflation channel, in the state that the seals seal the gap between the pressing assembly and the in-pile pipeline, the sealed space between two adjacent seals is a detection space, and the inflation assembly inflates gas into the detection space through the inflation channel to detect the air tightness of the seals.

2. The line blanking device of claim 1, wherein, The pressing assembly comprises a sleeve and a pressing piece, the sleeve is formed with a guide channel penetrating through a lower end face of the sleeve, the pressing piece comprises a sliding rod and a stopper connected with the sliding rod, at least a part of the sliding rod is movably arranged in the guide channel, the stopper is located below the sleeve, an upper end face of the stopper, an outer peripheral surface of the sliding rod and the lower end face of the sleeve jointly define the pressing groove, and the pressing piece moves relatively to the sleeve in the up-down direction to adjust the volume of the pressing groove.

3. The line blanking device of claim 2, wherein, The pressing assembly comprises an adjusting piece, the adjusting piece is sleeved on the outer periphery of the sliding rod and threadedly cooperates with the sliding rod, the adjusting piece and the pressing piece relatively rotate to enable the pressing piece to move relatively to the sleeve in the up-down direction.

4. The line blanking device of claim 3, wherein, The adjusting piece comprises a threaded part and a blocking part connected with the threaded part, the blocking part is connected to the outer periphery of the threaded part, an upper end face of the sleeve is formed with an opening communicated with the guide channel, the threaded part extends into the opening of the sleeve and threadedly cooperates with an upper end of the sliding rod, and a lower surface of the blocking part abuts against the upper end face of the sleeve.

5. The line plugging apparatus of claim 1, wherein, The pressing assembly comprises a movable pressing block, and one pressing block is arranged between two adjacent seals.

6. The line plugging apparatus of claim 5, wherein, The pressing assembly comprises a sleeve and a pressing piece, the sleeve is formed with a guide channel penetrating through a lower end face of the sleeve, the pressing piece comprises a sliding rod and a stopper connected with the sliding rod, at least a part of the sliding rod is movably arranged in the guide channel, the stopper is located below the sleeve, an upper end face of the stopper, an outer peripheral surface of the sliding rod and the lower end face of the sleeve jointly define the pressing groove, a cavity is formed in the pressing piece, a through hole is formed in the peripheral surface of the pressing piece, a communication groove is formed in the peripheral surface of the pressing block, and the cavity, the through hole and the communication groove jointly constitute the inflation channel.

7. The line plugging apparatus of claim 1, wherein, The inflating assembly includes an inflating pipe, a switch valve and a gas pump. The inflating pipe is communicated with the gas pump and the inflating passage. The switch valve is arranged on the inflating pipe to selectively open or close the inflating pipe.

8. The line plugging apparatus of claim 7, wherein, The inflating assembly includes a pressure gauge arranged on the inflating pipe to detect the gas pressure of the detection space.

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