Pipeline pressure external plugging device

Abstract

The present application relates to the technical field of pipeline repair, and provides a pipeline external plugging device under pressure. The pipeline external plugging device under pressure comprises a sleeve, a plugging piece and a limiting piece. The sleeve has a cavity in the inside, the two ends of the cavity are communicated with the outside, and the sleeve is used for sleeving the pipeline. The plugging piece is arranged at the first end of the cavity and is used for switching between a conducting state and a plugging state. In the plugging state, the plugging piece plugs the first end of the cavity. The limiting piece is arranged between the sleeve and the plugging piece and is used for switching between a locking position and an unlocking position. In the locking position, the plugging piece is in the conducting state. The present application solves the defect that the pipeline external plugging device under pressure in the prior art has difficulty in plugging the pipeline with large flow pressure at the fracture opening, realizes a plugging device capable of coping with the flow pressure at the pipeline fracture opening, reduces the influence of the flow pressure at the fracture opening on the plugging work, and makes the plugging of such pipeline more convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline repair, in particular to a pipeline external plugging device under pressure. BACKGROUND

[0002] Pipeline transportation is a fluid transmission method widely used in various industries. According to the differences in the conveying medium and the application field, pipeline transportation includes oil transportation, water supply and wastewater treatment, etc. In the case of the rupture of some liquid conveying pipelines, it is extremely difficult to plug due to the continuous gushing of liquid. The existing plugging device needs to directly face the flow pressure of the fracture during the process of plugging such pipelines, and the plugging is difficult to develop. SUMMARY

[0003] The present application provides a pipeline external plugging device under pressure, which solves the defect that the existing pipeline external plugging device under pressure is difficult to develop when plugging a pipeline with a large flow pressure at the fracture, realizes a plugging device that can cope with the flow pressure at the pipeline fracture, 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 application provides a pipeline external plugging device under pressure, which includes:

[0005] A sleeve with a cavity inside, both ends of the cavity being in communication with the outside, the sleeve being used to sleeve the pipeline;

[0006] A plugging piece provided at the first end of the cavity, used to switch between a conducting state and a plugging state, in the plugging state, the plugging piece plugging the first end of the cavity;

[0007] A limiting piece provided between the sleeve and the plugging piece, used to switch between a locking position and an unlocking position, in the locking position, the plugging piece is in the conducting state.

[0008] According to the pipeline external plugging device under pressure provided by the present application, the second end of the cavity is provided with a sealing piece, and the sealing piece is used to seal the gap between the sleeve and the pipeline.

[0009] According to the pipeline external plugging device under pressure provided by the present application, the plugging piece includes:

[0010] Two fixed baffles are provided at the inner wall of the cavity in a spaced manner;

[0011] A movable baffle is rotatably provided in the cavity and located between the two fixed baffles;

[0012] In the case that the movable baffle and the two fixed baffles are located in the same plane, the plugging piece is in the plugging state.

[0013] According to the pipeline pressure external plugging device, the inner wall of the cavity is provided with a clamping block, the clamping block is located on the side of the plugging member away from the sealing member, and the clamping block is used for limiting the movable baffle, so that the movable baffle abuts against the clamping block in the plugging state.

[0014] According to the pipeline pressure external plugging device, the movable baffle comprises a straight plate segment, both ends of the straight plate segment are provided with arc segments, and a rotating shaft is arranged at the connection position between one of the two arc segments and the straight plate segment.

[0015] According to the pipeline pressure external plugging device, the limiting member comprises a pin, the pin penetrates through the sleeve member, and one end of the pin is provided with a pull ring.

[0016] According to the pipeline pressure external plugging device, the sleeve member comprises a sealing segment, a limiting segment and a sleeve segment which are sequentially connected, the sealing segment is used for assembling the sealing member, the limiting segment is used for limiting the sealing member, and the sealing segment is used for sleeving the pipeline.

[0017] According to the pipeline pressure external plugging device, the sealing segment is gradually contracted from one end connected with the limiting segment to the other end.

[0018] According to the pipeline pressure external plugging device, the diameter of the one end of the limiting segment connected with the sealing segment is smaller than the diameter of the one end of the sealing segment connected with the limiting segment.

[0019] According to the pipeline pressure external plugging device, the inner wall of the sealing member is provided with a sealing groove, and the axial length of the sealing member is smaller than the length of the sealing segment.

[0020] The pipeline pressure external plugging device can avoid direct contact with high-pressure fluid during installation, reduces the influence of the flow pressure of the fracture on the plugging work, and makes the plugging of such pipelines more convenient. Secondly, since the entire plugging process does not require complex preparation work or additional tool support, the operator can quickly deploy and start the plugging mechanism, thereby effectively shortening the leakage time and reducing the loss caused by delay. In addition, the design guarantees efficient plugging effect. Once the limiting member switches to the unlocking position, the plugging member can be quickly converted to the plugging state to immediately stop the liquid leakage. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to make the technical solutions in the present application or prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0022] Figure 1 is a structural schematic view of a first perspective of the pipeline external plugging device under pressure provided by the present application.

[0023] Figure 2 is a structural schematic view of a second perspective of the pipeline external plugging device under pressure provided by the present application.

[0024] Figure 3 is a sectional view of the pipeline external plugging device under pressure provided by the present application.

[0025] Figure 4 is a structural schematic view of a movable baffle of the pipeline external plugging device under pressure provided by the present application.

[0026] Figure 5 is a structural schematic view of a limiting piece of the pipeline external plugging device under pressure provided by the present application.

[0027] Figure 6 is a cross-sectional schematic view of a sealing piece of the pipeline external plugging device under pressure provided by the present application.

[0028] Reference signs:

[0029] 100: set; 110: sealing section; 120: limiting section; 130: sleeving section;

[0030] 200: plugging piece; 210: movable baffle; 211: arc section; 212: straight plate section; 213: rotating shaft; 220: fixed baffle;

[0031] 300: limiting piece; 310: pin; 320: pull ring;

[0032] 400: sealing piece; 410: sealing groove;

[0033] 500: clamping block. DETAILED DESCRIPTION

[0034] The embodiments of the present application will be further described in detail below in combination with the accompanying drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0035] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0036] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0037] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be 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 "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0038] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0039] The structure and working principle of the present application will be described below. Figures 1-6 The structure and working principle of the present application will be described below.

[0040] Referring toFigure 1 and Figure 2 The pipeline pressure external sealing device provided by the application comprises a sleeve 100, a sealing member 200 and a limiting member 300. The sleeve 100 has a cavity inside, and the two ends of the cavity are in communication with the outside. The sleeve 100 is used for sleeving the pipeline. Specifically, the device is mainly used for sealing the pipeline rupture. When the device is used, the sleeve 100 needs to be sleeved on one end of the pipeline rupture. Therefore, the shape of the sleeve 100 should be adapted to the shape of the pipeline rupture, so as to ensure that the sleeve 100 can be sleeved on the pipeline. For example, when the cross section of the pipeline rupture is circular, the cross section of the sleeve 100 is also circular, and the inner diameter of the sleeve 100 is greater than the outer diameter of the pipeline.

[0041] The sealing member 200 is arranged inside the first end of the cavity. The sealing member 200 is used for switching between the open state and the sealing state. In the sealing state, the sealing member 200 seals the first end of the cavity. It should be noted that the sealing state means that the sealing member 200 just seals the first end of the cavity in this state, so as to prevent the internal fluid of the pipeline from overflowing. The open state means that the sealing member 200 does not seal the first end of the cavity in this state, so that the cavity is still in communication with the outside at this time, and the internal fluid of the pipeline can flow out through the first end of the cavity at this time. In this state, the impact force of the fluid does not act on the sleeve 100, or the impact of the fluid on the sleeve 100 is reduced.

[0042] The limiting member 300 is arranged between the sleeve 100 and the sealing member 200, and is used for switching between the locked position and the unlocked position. The limiting member 300 controls whether the sealing member 200 can switch between the two states. Thus, it is ensured that the sealing member 200 can be in the corresponding state at the appropriate time. For example, when the limiting member 300 is in the locked position, the sealing member 200 is kept in the open state. When the limiting member 300 is in the unlocked position, the limitation on the sealing member 200 is released, so that the sealing member 200 can be adjusted from the open state to the sealing state. It should be noted that the limiting member 300 does not directly drive the sealing member 200 to adjust from the open state to the sealing state.

[0043] When facing the leakage problem caused by the pipeline rupture, the operator can sleeve the sleeve 100 on the pipeline. In this process, the limiting member 300 is in the locked position, so that the sealing member 200 is kept in the open state. In this way, the operator is not affected by the high-pressure liquid in the pipeline during the installation process, so as to ensure the safety of the operation and the correct placement of the equipment. When the sleeve 100 is firmly fixed on the pipeline, the operator can adjust the limiting member 300 to the unlocked position. At this time, the sealing member 200 is quickly switched from the open state to the sealing state under the impact of the fluid in the pipeline, effectively sealing the first end of the cavity, and immediately stopping the fluid from continuing to leak.

[0044] The present application can avoid direct contact with high-pressure fluid during installation. This not only reduces the potential danger faced by the operator, but also ensures that the plugging operation can be safely carried out even in a high-pressure environment. Secondly, since the entire plugging process does not require complex preparation or additional tool support, the operator can quickly deploy and start plugging, thereby effectively shortening the leakage time and reducing losses due to delays. In addition, the design ensures efficient plugging effect. Once the limiting member 300 switches to the unlocked position, the plugging member 200 can quickly switch to the plugged state to immediately stop the liquid from leaking out. Finally, the present application also exhibits good adaptability and flexibility.

[0045] Referring to Figure 2 In some embodiments of the present application, the second end of the cavity is provided with a sealing member 400 for sealing the gap between the sleeve 100 and the pipeline. In this embodiment, the sealing member 400 is tightly filled in the interior of the sleeve 100, so as to prevent 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 in a high-pressure environment. It should be noted that the sealing member 400 is pre-set on the inner wall of the internal cavity of the sleeve 100. This pre-setting ensures that the sealing member 400 can be accurately positioned during installation and also be well protected in the uninstalled state.

[0046] When selecting the material of the sealing member 400, the nature of the liquid being transported in the pipeline and the specific conditions of the working environment need to be considered. For example, if the pipeline is flowing with a highly corrosive chemical substance, a material with excellent chemical resistance should be chosen, such as fluororubber or Teflon; for an environment with large temperature changes, a material that can adapt to a wide temperature range should be used, such as silicone rubber, to ensure that the sealing member 400 can maintain its performance at different temperatures. In addition, the sealing member 400 also needs to have sufficient mechanical strength and elasticity to tightly fit the pipeline surface while withstanding high pressure, at which time natural rubber or synthetic rubber can be chosen.

[0047] In the actual installation process, the pipeline surface needs to be thoroughly cleaned first to remove any impurities that may affect the sealing effect. Then, the sleeve 100 is fitted onto the damaged pipeline, at which time the sealing member 400 pre-set on the inner wall of the internal cavity of the sleeve 100 is tightly set between the sleeve 100 and the pipeline under the friction between them. The sleeve 100 is tightly fitted to the pipeline by appropriate pre-tightening force, which can ensure that the sealing member 400 forms an effective seal at the gap between the second end of the cavity and the pipeline.

[0048] Referring to Figure 1In some embodiments of the present application, the blocking member 200 includes a movable baffle 210 and two fixed baffles 220 symmetrically fixed on both sides of the inner wall of the cavity. It can be understood that the cross-section of the cavity is circular, so the two fixed baffles 220 are symmetric about the central 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; the movable baffle 210 is rotatably arranged inside the cavity and located between the two fixed baffles 220; when the movable baffle 210 is located in the same plane as the two fixed baffles 220, the blocking member 200 is in a blocking state.

[0049] In the above structure, through the cooperation between the movable baffle 210 and the two fixed baffles 220 on both sides, a complete plane can be quickly formed when needed, effectively blocking the leakage point of the pipeline. When the movable baffle 210 is rotated to the position where it is flush with the fixed baffles 220, the three work together to form a solid and well-sealed barrier, effectively preventing further leakage of the liquid.

[0050] Secondly, the design of the movable baffle 210 makes the blocking member 200 more flexible during installation. In the initial state, the movable baffle 210 can be kept in the open state, so that when the sleeve 100 is sleeved on the damaged pipeline, it will not be affected by the pressure from the inside of the pipeline, thereby simplifying the installation process and improving the safety of operation. Once the sleeve 100 is firmly fixed on the pipeline, the movable baffle 210 can be quickly switched to the blocking position by adjusting the limiting member 300, ensuring the immediacy and effectiveness of the blocking.

[0051] In addition, this design also enhances the reliability and durability of the entire system. The fixed baffles 220 provide a stable support structure, while the movable baffle 210 can maintain its flexibility and sealing performance even after multiple uses. This not only prolongs the service life of the blocking 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, this also reduces unnecessary wear and tear, further improving the overall performance of the equipment. Avoiding the case where the blocking member 200 is a single baffle, if there is any slight unevenness or damage between the baffle and the pipeline, it may lead to the defect of incomplete sealing.

[0052] Reference Figure 4In some embodiments of the present application, the movable baffle 210 includes a straight plate segment 212, which is specifically a rectangular plate structure, and two arc segments 211 are fixedly arranged at both ends of the straight plate segment 212 along the length direction. The two arc segments 211 and the straight plate segment 212 can be integrally formed. The two arc segments 211 are rotatably connected to the inner wall of the cavity through the rotation shafts 213 arranged at both sides of the connection between the arc segments 211 and the straight plate segment 212. It should be noted that the side edges (i.e., both sides in the width direction) of the fixed baffle 220 close to the movable baffle 210 are adapted to the side surface of the straight plate segment 212, so that when the movable baffle 210 is moved to be coplanar with the two fixed baffles 220, the movable baffle 210 can be tightly connected with the plugging member 200. The side of the arc segment 211 away from the straight plate segment 212 is arc-shaped and adapted to the inner wall of the cavity, so that when the movable baffle 210 is moved to be coplanar with the two fixed baffles 220, the two arc-shaped sides can be tightly matched with the cavity, but will not affect the normal rotation of the straight plate segment 212.

[0053] Referring to Figure 1 In some embodiments of the present application, the inner wall of the cavity is provided with a clamping block 500, which is located on the side of the plugging member 200 away from the sealing member 400. The clamping block 500 is used to limit the movable baffle 210, so that in the plugging state, the movable baffle 210 abuts against the end face on the side of the clamping block 500 facing the movable baffle 210.

[0054] In the above structure, the clamping block 500 provides a limiting effect, ensuring that the movable baffle 210 can be accurately positioned in the plugging 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 for maintaining the effectiveness of the plugging member 200, as it ensures that a continuous and smooth sealing surface is formed between the movable baffle 210 and the fixed baffle 220, effectively preventing liquid leakage.

[0055] Secondly, the presence of the clamping block 500 enhances the overall structural strength of the plugging member 200. In the plugging state, the movable baffle 210 is subjected to pressure from the inside of the pipeline, while the clamping block 500 provides a solid support point for the movable baffle 210. This not only disperses the pressure borne by the movable baffle 210, but also reduces stress concentration on individual components, helping to extend the service life of the entire plugging device. In addition, the clamping 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.

[0056] Furthermore, the card block 500 simplifies the adjustment step in the operation process. Since the card 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 rotate the movable baffle 210 to the position flush with the two fixed baffles 220 by adjusting the limiting piece 300. In this way, the operation becomes more intuitive and simple, especially in emergency situations, the leakage can be quickly and effectively controlled, and the speed and efficiency of emergency response are improved.

[0057] With reference to Figure 1 and Figure 5 In some embodiments of the present application, the limiting piece 300 includes a pin 310, the pin 310 penetrates the sleeve 100, and one end of the pin 310 is provided with a pull ring 320.

[0058] Specifically, since the length of the straight plate section 212 in the movable baffle 210 is much greater than the length of the arc section 211, and the pivot 213 is arranged at the connection between the arc section 211 and the straight plate section 212. Therefore, the movable baffle 210 will rotate around the pivot 213 during rotation. When setting the limiting piece 300, the pin 310 needs to penetrate the sleeve 100, and the pin 310 needs to be located on the side of the arc section 211 where the pivot 213 is arranged. The arc section 211 where the pivot 213 is arranged has a smaller radius of rotation, so the pin 310 can only occupy the edge part of the cavity, avoiding affecting the fluid. As shown in Figure 1 the limiting piece 300 is arranged in the upper left corner of the sleeve 100. The pin 310 is located on the inside of the plugging piece 200, and since the plugging piece 200 rotates towards the inside of the cavity, the pin 310 arranged on the inside of the plugging piece 200 can prevent the plugging piece 200 from rotating outward, so that the plugging piece 200 is always open and maintained in a dredging state.

[0059] With reference to Figure 3 In some embodiments of the present application, the sleeve 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 piece 400, the limiting section 120 is used to limit the sealing piece 400, and the sleeve section 130 is used to sleeve the pipeline. The sealing section 110 gradually shrinks from the 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 surface of the sealing piece 400 is inclined, and the inclination is adapted to the inclination of the sealing section 110, the axial length of the sealing piece 400 is smaller than the length of the sealing section 110, and in the initial state, the sealing piece 400 can slide to the limiting section 120 with a small amplitude in the sealing section 110.

[0060] Specifically, when performing the operation, one end of the sleeve 100 is sleeved outside the pipeline, and then the sleeve 100 is pushed to move towards the pipeline. Since the sealing piece 400 is arranged at the sealing section 110, during the sleeving process, the pipeline drives the sealing piece 400 to move towards the limiting section 120, so that a small gap is generated between the sealing piece 400 and the sealing section 110, and the expansion space of the sealing piece 400 is ensured. When moving to the connection position of the sealing section 110 and the limiting section 120, the sealing piece 400 is limited by the limiting section 120, and the further movement of the sealing piece 400 is prevented. Under the continuous action of the pushing force, the pipeline continues to move towards the sleeving section 130 until the inside of the sleeving section 130 is sleeved.

[0061] It should be noted that the pipeline does not need to enter the inside of the sleeving section 130 too much, and only needs to make the end face of the pipeline pass the limiting section 120. The effect is that the sealing piece 400 can be better sleeved on the pipeline, and the phenomenon that the sealing piece 400 cannot be completely sleeved on the pipeline due to too small overlap of the pipeline is avoided. After the pipeline is sleeved in place, the sleeve 100 can be pulled outwards to a certain extent, so that the sleeve 100 and the pipeline are away from each other. In this way, under the action of the friction force, the sealing piece 400 moves towards the narrower end of the sealing section 110, so that the sealing piece 400 is extruded, and the sealing effect is further improved.

[0062] Reference Figure 6 In some embodiments of the present application, the inner wall of the sealing piece 400 is provided with a sealing groove 410, and specifically, the sealing groove 410 is arranged on the side of the sealing piece 400 in contact with the pipeline. In this pipeline pressure sealing device, the inner wall of the sealing piece 400 in contact with the pipeline is provided with a sealing groove 410, which further improves the overall sealing performance of the device. The existence of the sealing groove 410 not only increases the friction force between the sealing piece 400 and the surface of the pipeline, but also ensures a tighter and more reliable seal by increasing the contact area and forming a small mechanical locking effect.

[0063] Specifically, when the sleeve 100 is sleeved on the damaged pipeline, the tapered structure of the sealing section 110 enables the sleeve 100 to gradually closely fit the surface of the pipeline. The sealing grooves 410 on the inner wall of the sealing piece 400 play a role in this process. These sealing grooves 410 can form multi-point contact on the surface of the pipeline, so that even if the surface of the pipeline has slight irregularities or damage, good sealing effect can be achieved through the biting action of the sealing grooves 410. The design of multi-point contact helps to disperse the pressure and reduce the stress concentration at a single contact point, thereby improving the durability and long-term stability of the sealing piece 400.

[0064] In addition, the inclined structure of the sealing groove 410, the sealing member 400 and the sealing section 110 can effectively prevent the sealing member 400 from sliding or shifting under the action of high-pressure fluid. In actual application, especially in a high-pressure environment, 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 does not lose the sealing effect due to changes in external pressure.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A pressurized external sealing device for pipelines, characterized in that, include: The kit (100) has an internal cavity with both ends connected to the outside, and the kit (100) is used to connect to a pipe; A blocking component (200) is disposed 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 component (200) blocks the first end of the cavity. The sealing element (200) includes: Two fixed baffles (220) are spaced apart on the inner wall of the cavity; The movable baffle (210) is rotatably disposed in the cavity and located between the two fixed baffles (220); A limiting element (300) is disposed between the kit (100) and the plugging element (200) for switching between a locked position and an unlocked position. In the locked position, the plugging element (200) is in a conducting state. When the limiting element (300) is in the unlocked position, the plugging element (200) quickly changes from a conducting state to a blocking state under the impact of the fluid inside the pipe. The limiting element (300) does not directly drive the plugging element (200) to change from a conducting state to a blocking state.

2. The pipeline pressurized external sealing device according to claim 1, characterized in that, The second end of the cavity is provided with a seal (400) for sealing the gap between the kit (100) and the pipe.

3. The pipeline pressurized external sealing device according to claim 2, characterized in that, When the movable baffle (210) and the two fixed baffles (220) are located on the same plane, the sealing member (200) is in a sealing state.

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

5. The pipeline pressurized external sealing device according to claim 4, characterized in that, The movable baffle (210) includes a straight section (212), both ends of which are provided with arc sections (211). One of the two arc sections (211) is connected to the straight section (212) with a pivot (213). The movable baffle (210) is rotatably disposed in the cavity through the pivot (213).

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

7. The pipeline pressurized external sealing device according to claim 2, characterized in that, The kit (100) includes a sealing section (110), a limiting section (120), and a socket section (130) connected in sequence. The sealing section (110) is used to assemble the seal (400), the limiting section (120) is used to limit the seal (400), and the socket section (130) is used to socket the pipe.

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

9. The pipeline pressurized external sealing device according to claim 8, characterized in that, The diameter of the end where the limiting section (120) connects to the sealing section (110) is smaller than the diameter of the end where the sealing section (110) connects to the limiting section (120).

10. The pipeline pressurized external sealing device according to any one of claims 7-9, characterized in that, The inner wall of the seal (400) is provided with sealing grooves (410), and the axial length of the seal (400) is less than the length of the sealing section (110).

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