Pipeline under-pressure outer plugging device

Abstract

The invention relates to the technical field of pipeline maintenance, and provides a pipeline under-pressure outer plugging device. The pipeline under-pressure outer plugging device comprises a sleeve piece, a plugging piece and a limiting piece. Wherein a cavity is formed in the sleeve piece, the two ends of the cavity communicate with the outside, and the sleeve piece is used for being connected with a pipeline in a sleeving mode; the plugging piece is arranged at the first end of the cavity and used for switching between a conducting state and a plugging state, and in the plugging state, the plugging piece plugs the first end of the cavity; the limiting piece is arranged between the sleeve piece and the plugging piece and used for being switched between a locking position and an unlocking position, and the plugging piece is in a conducting state at the locking position. According to the external plugging device, the defect that in the prior art, a pipeline under-pressure external plugging device is difficult to unfold when plugging a pipeline with large flowing pressure at a fracture opening is overcome, the plugging device capable of coping with the flowing pressure at the fracture opening of the pipeline is achieved, the influence of the flowing pressure at the fracture opening on plugging work is reduced, and plugging of the pipeline of the type is more convenient.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline maintenance, and in particular to a pipeline pressure external plugging device. Background Art

[0002] Pipeline transportation is a fluid transmission method widely used in various industries. Depending on the different transport media and application fields, pipeline transportation includes oil transportation, water supply and wastewater treatment. In the case of some liquid transportation pipelines being broken, the continuous gushing of liquids makes it extremely difficult to seal. In the process of sealing such pipelines, the existing sealing devices need to directly face the flow pressure of the fracture, making it difficult to seal. Summary of the invention

[0003] The present invention provides a pipeline pressure external plugging device, which is used to solve the defect that the pipeline pressure external plugging device in the prior art is difficult to deploy for plugging a pipeline with a large flow pressure at a fracture, and realizes a plugging device that can cope with the flow pressure at the fracture of the pipeline, reduces the influence of the flow pressure at the fracture on the plugging work, and makes the plugging of such pipelines more convenient.

[0004] The present invention provides a pipeline pressure external plugging device, comprising: A kit having a cavity inside, two ends of the cavity being connected to the outside, and the kit is used for sleeve connection of a pipeline; A blocking member, disposed at the first end of the cavity, for switching between a conducting state and a blocking state, wherein the blocking member blocks the first end of the cavity in the blocking state; The limiting member is arranged between the kit and the blocking member, and is used for switching between a locked position and an unlocked position. In the locked position, the blocking member is in a conducting state.

[0005] According to a pipeline pressure external plugging device provided by the present invention, a sealing member is provided at the second end of the cavity, and the sealing member is used to seal the gap between the kit and the pipeline.

[0006] According to a pipeline pressure external plugging device provided by the present invention, the plugging member comprises: Two fixed baffles are arranged at intervals on the inner wall of the cavity; A movable baffle, rotatably disposed on the cavity and located between the two fixed baffles; When the movable baffle and the two fixed baffles are located on the same plane, the blocking member is in a blocking state.

[0007] According to a pipeline pressure external plugging device provided by the present invention, a blocking block is provided on the inner wall of the cavity, and the blocking block is located on the side of the plugging member away from the sealing member. The blocking block is used to limit the movable baffle so that in the plugging state, the movable baffle abuts against the blocking block.

[0008] According to a pipeline pressure external plugging device provided by the present invention, the movable baffle includes a straight plate section, both ends of the straight plate section are provided with arc sections, a rotating shaft is provided at the connection between one of the two arc sections and the straight plate section, and the movable baffle is rotatably arranged in the cavity via the rotating shaft.

[0009] According to a pipeline pressure external plugging device provided by the present invention, the limiting member includes a pin, the pin passes through the kit, and a pull ring is provided at one end of the pin.

[0010] According to a pipeline pressurized external plugging device provided by the present invention, the kit includes a sealing section, a limiting section and a sleeve section connected in sequence, the sealing section is used to assemble the seal, the limiting section is used to limit the seal, and the sealing section is used to sleeve the pipeline.

[0011] According to the pipeline pressure external plugging device provided by the present invention, the sealing section gradually shrinks from one end connected to the limiting section to the other end.

[0012] According to a pipeline pressure external plugging device provided by the present invention, the diameter of the end where the limiting section is connected to the sealing section is smaller than the diameter of the end where the sealing section is connected to the limiting section.

[0013] According to a pipeline pressure external plugging device provided by the present invention, the inner wall of the sealing member is provided with sealing grooves, and the axial length of the sealing member is smaller than the length of the sealing section.

[0014] The present invention provides a pipeline pressurized external plugging device, which can avoid direct contact with high-pressure fluid during the installation process, thereby reducing the impact of the flow pressure at the fracture on the plugging work, making the plugging of such pipelines more convenient. Secondly, since the entire plugging process does not require complicated preparations or the support of additional tools, operators can quickly deploy and start the plugging mechanism, thereby effectively shortening the leakage time and reducing losses caused by delays. In addition, the design ensures an efficient plugging effect. Once the limiter is switched to the unlocked position, the plugging member can be quickly converted to a plugging state to immediately prevent liquid leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of the pipeline pressure external plugging device provided by the present invention from a first perspective.

[0017] Figure 2 It is a structural schematic diagram of the pipeline pressure external plugging device provided by the present invention from a second perspective.

[0018] Figure 3 It is a cross-sectional view of the pipeline pressure external plugging device provided by the present invention.

[0019] Figure 4 It is a structural schematic diagram of a movable baffle of a pipeline pressure external plugging device provided by the present invention.

[0020] Figure 5 It is a structural schematic diagram of a limiter of the pipeline pressurized external plugging device provided by the present invention.

[0021] Figure 6 It is a schematic cross-sectional view of a seal of the pipeline pressurized external plugging device provided by the present invention.

[0022] Reference numerals: 100: kit; 110: sealing section; 120: limiting section; 130: sleeve section; 200: blocking member; 210: movable baffle; 211: arc segment; 212: straight plate segment; 213: rotating shaft; 220: fixed baffle; 300: limiter; 310: pin; 320: pull ring; 400: seal; 410: seal pattern; 500: Card block. DETAILED DESCRIPTION

[0023] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0026] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0028] Combine the following Figure 1-Figure 6 The structure and working principle of the present invention are described.

[0029] Reference Figure 1 and Figure 2 The pipeline pressure external plugging device provided by the present invention includes a kit 100, a plugging piece 200 and a limit piece 300. The kit 100 has a cavity inside, and both ends of the cavity are connected to the outside, and the kit 100 is used to sleeve the pipeline. Specifically, the device is mainly used for sealing broken pipelines. When using the present invention, the kit 100 needs to be sleeved on one end of the broken pipeline. Therefore, the shape of the kit 100 should be compatible with the shape of the broken pipeline, so as to ensure that the kit 100 can be sleeved on the pipeline. For example, when the cross-section of the broken pipeline is circular, the cross-section of the kit 100 is also circular, and the inner diameter of the kit 100 is larger than the outer diameter of the pipeline.

[0030] The plugging member 200 is disposed inside the first end of the cavity, and the plugging member 200 is used to switch between a conducting state and a blocking state. In the blocking state, the plugging member 200 blocks the first end of the cavity. It should be noted that the blocking state means that the plugging member 200 just closes the first end of the cavity in this state to prevent the fluid inside the pipeline from overflowing. The conducting state means that the plugging member 200 does not close the first end of the cavity in this state, and the cavity is still connected to the outside at this time, and the fluid inside the pipeline can flow out through the first end of the cavity. In this state, the impact force of the fluid will not act on the kit 100, or the impact of the fluid on the kit 100 is reduced.

[0031] The limit member 300 is arranged between the kit 100 and the blocking member 200, and is used to switch between the locked position and the unlocked position. The function of the limit member 300 is to control whether the blocking member 200 can switch between the above two states. Thereby ensuring that the blocking member 200 can be in the corresponding state at the appropriate time. For example, when the limit member 300 is in the locked position, the blocking member 200 is in a conductive state. When the limit member 300 is in the unlocked position, the restriction on the blocking member 200 is released, so that the blocking member 200 can be adjusted from the conductive state to the blocked state. It should be noted that the limit member 300 does not directly drive the blocking member 200 to adjust from the conductive state to the blocked state.

[0032] When facing leakage caused by pipeline rupture, the operator can put the kit 100 on the pipeline. In this process, the stopper 300 is in the locked position to keep the plugging member 200 in the conductive state. In this way, it will not be affected by the high-pressure liquid inside the pipeline during the installation process, thereby ensuring the safety of operation and the correct placement of the equipment. When the kit 100 is firmly fixed on the pipeline, the operator can adjust the stopper 300 to the unlocked position. At this time, the plugging member 200 is quickly converted from the conductive state to the blocked state under the impact of the fluid inside the pipeline, effectively sealing the first end of the cavity and immediately preventing the fluid from continuing to leak out.

[0033] The present invention can avoid direct contact with high-pressure fluid during the installation process. This not only reduces the potential dangers faced by operators, but also ensures that the plugging operation can be carried out safely even in a high-pressure environment. Secondly, since the entire plugging process does not require complicated preparations or the support of additional tools, operators can quickly deploy and start plugging, thereby effectively shortening the leakage time and reducing losses caused by delays. In addition, the design ensures an efficient plugging effect. Once the limit member 300 is switched to the unlocked position, the plugging member 200 can be quickly converted to a plugging state to immediately prevent liquid leakage. Finally, the present invention also demonstrates good adaptability and flexibility.

[0034] Reference Figure 2 In some embodiments of the present invention, a seal 400 is provided at the second end of the cavity, and the seal 400 is used to seal the gap between the kit 100 and the pipeline. In this embodiment, the seal 400 is tightly filled in the interior of the kit 100, so as to prevent the liquid from leaking out of these tiny spaces. This design not only enhances the overall sealing effect of the plugging device, but also improves its reliability and stability under high pressure environments. It should be noted that the seal 400 is pre-set on the inner wall of the internal cavity of the kit 100. This preset method ensures that the seal 400 can be accurately positioned during the installation process and can be well protected when not installed.

[0035] When selecting the material of the seal 400, the properties of the liquid transported in the pipeline and the specific conditions of the working environment need to be considered. For example, if the chemical substance flowing in the pipeline is highly corrosive, a material with excellent chemical resistance, such as fluororubber or Teflon, should be selected; and for an environment with large temperature changes, a material that can adapt to a wide temperature range, such as silicone rubber, should be used to ensure that the seal 400 can maintain its performance at different temperatures. In addition, the seal 400 also needs to have sufficient mechanical strength and elasticity to fit closely to the surface of the pipeline while withstanding high pressure. In this case, natural rubber or synthetic rubber can be selected.

[0036] During the actual installation process, the surface of the pipeline must be thoroughly cleaned to remove any impurities that may affect the sealing effect. Then, the kit 100 is sleeved onto the damaged pipeline. At this time, the seal 400 pre-set on the inner wall of the internal cavity of the kit 100 is tightly set between the kit 100 and the pipeline due to the friction between the two. The kit 100 is tightly fitted to the pipeline through appropriate pre-tightening force, which ensures that the seal 400 forms an effective seal at the gap between the second end of the cavity and the pipeline.

[0037] Reference Figure 1In some embodiments of the present invention, the blocking member 200 includes a movable baffle 210 and two fixed baffles 220, and the two fixed baffles 220 are symmetrically fixed on both sides of the inner wall of the cavity. It can be understood that if the cross-section of the cavity is circular, the two fixed baffles 220 are symmetrical about the central cross-section of the cavity. Specifically, one side of the fixed baffle 220 is adapted to the inner wall of the cavity and is tightly connected to the inner wall of the cavity to ensure sealing; and the movable baffle 210 is rotatably arranged inside the cavity and is located between the two fixed baffles 220; when the movable baffle 210 moves to the same plane as the two fixed baffles 220, the blocking member 200 is in a blocking state.

[0038] In the above structure, through the cooperation between the movable baffle 210 and the fixed baffles 220 on both sides, a complete plane can be quickly formed when needed to effectively block the pipeline leakage point. When the movable baffle 210 rotates to a position flush with the fixed baffle 220, the three work together to form a strong and well-sealed barrier, effectively preventing further leakage of the liquid.

[0039] Secondly, the design of the movable baffle 210 makes the plugging member 200 more flexible during installation. In the initial state, the movable baffle 210 can remain in the conductive state, so that when the kit 100 is sleeved on the damaged pipe, it will not be affected by the pressure inside the pipe, thereby simplifying the installation process and improving the safety of operation. Once the kit 100 is firmly fixed on the pipe, the movable baffle 210 can be quickly switched to the plugging position by adjusting the limiter 300, ensuring the immediacy and effectiveness of the plugging.

[0040] In addition, this design also enhances the reliability and durability of the entire system. The fixed baffle 220 provides a stable support structure, while the movable baffle 210 can maintain its flexibility and sealing performance during multiple uses. This not only extends the service life of the plugging device, but also reduces maintenance costs. At the same time, since the movable baffle 210 can be in a non-blocking state when not in use, it also reduces unnecessary wear and tear, further improving the overall performance of the equipment. In the case where the plugging member 200 is a single baffle, any slight unevenness or damage on the contact surface between the baffle and the pipeline may cause an incomplete seal defect.

[0041] Reference Figure 4In some embodiments of the present invention, the movable baffle 210 includes a straight plate section 212, which is specifically a rectangular plate-shaped structure, and arc sections 211 are fixedly provided at both ends of the straight plate section 212 along the length direction. The two arc sections 211 and the straight plate section 212 can be integrally formed. A rotating shaft 213 is provided on both sides of the connection between one of the two arc sections 211 and the straight plate section 212, and the rotating shaft 213 is rotatably connected to the inner wall of the cavity. It should be noted that the side of the fixed baffle 220 close to the movable baffle 210 (that is, the two sides of the fixed baffle 220 along the width direction) is adapted to the side of the straight plate section 212, so as to ensure that when the movable baffle 210 moves to be coplanar with the two fixed baffles 220, the movable baffle 210 and the blocking member 200 can be tightly connected. The side of the arc segment 211 facing away from the straight plate segment 212 is arc-shaped and matched with the inner wall of the cavity, ensuring that when the movable baffle 210 moves to be coplanar with the two fixed baffles 220, the two arc-shaped side surfaces can fit tightly with the cavity but will not affect the normal rotation of the straight plate segment 212.

[0042] Reference Figure 1 In some embodiments of the present invention, a block 500 is provided on the inner wall of the cavity. The block 500 is located on the side of the blocking member 200 away from the sealing member 400. The block 500 is used to limit the movable baffle 210 so that in the blocked state, the movable baffle 210 abuts against the end surface of the block 500 facing the movable baffle 210.

[0043] In the above structure, the block 500 provides a limiting function to ensure that the movable baffle 210 can be accurately positioned in the blocking state. This means that even under the action of high-pressure fluid, the movable baffle 210 will not be displaced or deformed due to external pressure. This stable positioning is crucial to maintaining the effectiveness of the blocking member 200, because it ensures that a continuous and flat sealing surface is formed between the movable baffle 210 and the fixed baffle 220, thereby effectively preventing liquid leakage.

[0044] Secondly, the existence of the block 500 enhances the overall structural strength of the plugging device 200. In the plugging state, the movable baffle 210 is subjected to pressure from the inside of the pipeline, and the block 500 provides a solid support point for the movable baffle 210. This not only disperses the pressure on the movable baffle 210, but also reduces the stress concentration on a single component, which helps to extend the service life of the entire plugging device. In addition, the block 500 can also prevent the movable baffle 210 from failing due to fatigue during long-term use, further improving the reliability and durability of the system.

[0045] Furthermore, the block 500 simplifies the adjustment steps during the operation. Since the block 500 pre-sets the optimal position of the movable baffle 210, the operator does not need to worry about whether the movable baffle 210 is completely in place, and only needs to adjust the limiter 300 to rotate the movable baffle 210 to a position flush with the two fixed baffles 220. In this way, the operation becomes more intuitive and simple, especially in an emergency, the leakage can be quickly and effectively controlled, and the speed and efficiency of emergency response can be improved.

[0046] Reference Figure 1 and Figure 5 In some embodiments of the present invention, the limiting member 300 includes a pin 310 , the pin 310 passes through the kit 100 , and a pull ring 320 is provided at one end of the pin 310 .

[0047] Specifically, in the movable baffle 210, the length of the straight plate segment 212 is much greater than the length of the arc segment 211, and the rotating shaft 213 is disposed at the connection between the arc segment 211 and the straight plate segment 212. Therefore, during the rotation process, the movable baffle 210 will rotate around the rotating shaft 213. When setting the limiter 300, it is necessary to pass the pin 310 through the kit 100, and make the pin 310 located on the side of the arc segment 211 with the rotating shaft 213. The arc segment 211 with the rotating shaft 213 has a smaller rotation radius, so the pin 310 can occupy only the edge of the cavity to avoid affecting the fluid. Figure 1 As shown, the stopper 300 is arranged at the upper left corner of the kit 100. The pin 310 is located inside the blocking member 200. Since the blocking member 200 rotates toward the inside of the cavity, when the pin 310 is arranged inside the blocking member 200, the blocking member 200 can be prevented from rotating outward, so that the blocking member 200 is always open and maintained in a clearing state.

[0048] Reference Figure 3 In some embodiments of the present invention, the kit 100 includes a sealing section 110, a limiting section 120 and a sleeve section 130 connected in sequence, the sealing section 110 is used to assemble the sealing member 400, the limiting section 120 is used to limit the sealing member 400, and the sleeve section 130 is used to sleeve the pipe. The sealing section 110 gradually shrinks from one end connected to the limiting section 120 to the other end. The diameter of the end of the limiting section 120 connected to the sealing section 110 is smaller than the diameter of the end of the sealing section 110 connected to the limiting section 120. It should be noted that the side of the sealing member 400 is an inclined surface, and the inclination is adapted to the inclination of the sealing section 110, the axial length of the sealing member 400 is smaller than the length of the sealing member 110, and the sealing member 400 can slide slightly toward the limiting section 120 in the sealing section 110 in the initial state.

[0049] Specifically, during the operation, one end of the kit 100 is sleeved on the outside of the pipeline, and then the kit 100 is pushed to move in the direction of the pipeline. Since the seal 400 is arranged at the sealing section 110, during the sleeve connection process, the pipeline will drive the seal 400 to move in the direction of the limiting section 120, so that a small gap is generated between the seal 400 and the sealing section 110, ensuring that the seal 400 has space for expansion. When moving to the connection between the sealing section 110 and the limiting section 120, the seal 400 will be limited by the limiting section 120 to prevent the seal 400 from moving further. Under the continuous action of the thrust, the pipeline will continue to move in the direction of the sleeve section 130 until it moves to the inside of the sleeve section 130.

[0050] It should be noted that the pipe does not need to enter too much into the sleeve section 130, and it is only necessary to make the end face of the pipe pass over the limit section 120. This can make the seal 400 better fit on the pipe, and avoid the seal 400 not being able to fit completely on the pipe due to the pipe sleeve overlap being too small. When the pipe is in place, the kit 100 can be pulled outward appropriately so that the kit 100 and the pipe are away from each other. In this way, under the action of friction, the seal 400 will move toward the narrower end of the sealing section 110, so that the seal 400 is squeezed, thereby increasing the sealing effect.

[0051] Reference Figure 6 In some embodiments of the present invention, the inner wall of the seal 400 is provided with a sealing pattern 410. Specifically, the sealing pattern 410 is provided on the side of the seal 400 that contacts the pipeline. In this set of pipeline pressure external plugging device, the inner wall of the seal 400 that contacts the pipeline is provided with a sealing pattern 410. This design further enhances the overall sealing performance of the device. The presence of the sealing pattern 410 not only increases the friction between the seal 400 and the pipeline surface, but also ensures a tighter and more reliable seal by increasing the contact area and forming a tiny mechanical locking effect.

[0052] Specifically, when the kit 100 is sleeved onto a damaged pipe, the tapered structure of the sealing section 110 enables the kit 100 to gradually fit closely to the pipe surface. The sealing grooves 410 on the inner wall of the seal 400 play a role in this process. These sealing grooves 410 can form multi-point contact on the pipe surface, and even if there are slight irregularities or damages on the pipe surface, a good sealing effect can be achieved through the bite of the sealing grooves 410. This multi-point contact design helps to disperse pressure and reduce stress concentration on a single contact point, thereby improving the durability and long-term stability of the seal 400.

[0053] In addition, the sealing groove 410, the sealing member 400 and the sealing section 110 are adapted to the inclined structure, which can effectively prevent the sealing member 400 from sliding or shifting under the action of the high-pressure fluid. In practical applications, especially under high-pressure environments, the engagement of the sealing groove 410, the sealing member 400 and the sealing section 110 provides additional gripping force, ensuring that the sealing member 400 is firmly fixed on the pipeline and will not lose the sealing effect due to changes in external pressure.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pipeline pressure external plugging device, characterized in that: include: A kit (100) having a cavity inside, with two ends of the cavity communicating with the outside, and the kit (100) is used for sleeve connection with a pipeline; A blocking member (200) is provided at the first end of the cavity and is used to switch between a conducting state and a blocking state. In the blocking state, the blocking member (200) blocks the first end of the cavity; The limiting member (300) is provided between the kit (100) and the blocking member (200) and is used to switch between a locked position and an unlocked position; in the locked position, the blocking member (200) is in a conducting state.

2. The pipeline pressure external plugging device according to claim 1 is characterized in that: A sealing member (400) is provided at the second end of the cavity, and the sealing member (400) is used to seal the gap between the kit (100) and the pipeline.

3. The pipeline pressure external plugging device according to claim 2 is characterized in that: The blocking member (200) comprises: Two fixed baffles (220) are arranged at intervals on the inner wall of the cavity; A movable baffle (210) rotatably disposed in the cavity and located between the two fixed baffles (220); When the movable baffle (210) and the two fixed baffles (220) are located on the same plane, the blocking member (200) is in a blocking state.

4. The pipeline pressure external plugging device according to claim 3 is characterized in that: A block (500) is provided on the inner wall of the cavity. The block (500) is located on a side of the blocking member (200) away from the sealing member (400). The block (500) is used to limit the movable baffle (210) so that in the blocking state, the movable baffle (210) abuts against the block (500).

5. The pipeline pressure external plugging device according to claim 4 is characterized in that: The movable baffle (210) comprises a straight plate segment (212), both ends of the straight plate segment (212) are provided with arc segments (211), a rotating shaft (213) is provided at the connection between one of the two arc segments (211) and the straight plate segment (212), and the movable baffle (210) is rotatably arranged in the cavity via the rotating shaft (213).

6. The pipeline pressure external plugging device according to claim 2, characterized in that: The limiting member (300) comprises a pin (310), the pin (310) passes through the kit (100), and a pull ring (320) is provided at one end of the pin (310).

7. The pipeline pressure external plugging device according to claim 2, characterized in that: The kit (100) comprises a sealing section (110), a limiting section (120) and a sleeve section (130) which are connected in sequence; the sealing section (110) is used for assembling the sealing member (400); the limiting section (120) is used for limiting the position of the sealing member (400); and the sleeve section (130) is used for sleeve connection with the pipeline.

8. The pipeline pressure external plugging device according to claim 7, characterized in that: The sealing section (110) gradually shrinks from one end connected to the limiting section (120) toward the other end.

9. The pipeline pressure external plugging device according to claim 8, characterized in that: The diameter of one end of the limiting section (120) connected to the sealing section (110) is smaller than the diameter of one end of the sealing section (110) connected to the limiting section (120).

10. The pipeline pressure external plugging device according to any one of claims 7 to 9, characterized in that: The inner wall of the sealing element (400) is provided with a sealing pattern (410), and the axial length of the sealing element (400) is smaller than the length of the sealing section (110).

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