Small-caliber pipeline sealing device and sealing method

Abstract

The invention belongs to the technical field of pipeline connection, and relates to a small-caliber pipeline sealing device and method. The small-caliber pipeline sealing device comprises a sealing assembly, an axial moving mechanism and a radial adjusting mechanism. The sealing assembly comprises a sealing shell and a sealing structure arranged on the side wall of the sealing shell. One end of the axial moving mechanism is rotationally connected with the bottom wall of the sealing shell, and the other end of the axial moving mechanism extends out of the sealing shell along the central axis of the sealing shell; the radial adjusting mechanism is arranged in the sealing shell in a sleeved mode, one end of the radial adjusting mechanism is connected with the inner wall of the sealing shell, and the other end of the radial adjusting mechanism is movably connected with the axial moving mechanism. Preliminary sealing and pressing sealing of a small-caliber pipeline can be achieved, the sealing effect is improved, pressure impact of a conveying medium can be borne, leakage can be effectively prevented, and sealing is safer and more reliable.

Description

Technical Field

[0001] This invention belongs to the field of pipeline connection technology and relates to a sealing device and sealing method for small-diameter pipelines. Background Technology

[0002] In media transportation systems, small-diameter pipelines are widely used in end-point supply networks and some industrial sites. In practical applications, pipeline leaks can occur due to the pipeline's own lifespan and external forces, posing safety hazards to the transport of fluid media. To prevent pipeline leaks, it is necessary to quickly and reliably seal the ports of small-diameter pipelines during installation, repair, modification, and routine maintenance to ensure a tight seal.

[0003] Traditional welding-based sealing methods for small-diameter pipelines, while achieving a seal, are complex, requiring specialized welding equipment and technicians. Furthermore, the welding process carries safety risks such as fire and explosion, and permanently alters the pipeline. Removing the seal is difficult and costly if the pipeline needs to be reopened. Therefore, researchers have proposed using simple rubber plugs or caps for sealing. While these methods are low-cost, their sealing effect is poor, unable to withstand the pressure of transported media, and prone to leakage, potentially leading to safety accidents. In addition, existing sealing devices using simple rubber plugs are poorly adaptable to small-diameter pipelines of varying sizes, lacking the flexibility to meet diverse usage requirements.

[0004] Therefore, developing a safe, reliable, easy-to-operate, adaptable, and effective small-diameter pipe sealing device is of great practical significance. Summary of the Invention

[0005] In view of the technical problems of poor sealing effect, inability to withstand the pressure of the medium, easy leakage of the medium, and safety accidents caused by existing small-diameter pipe sealing, the present invention provides a small-diameter pipe sealing device and sealing method.

[0006] This invention achieves initial sealing and compression sealing of small-diameter pipes through sealing components, axial movement mechanisms, and radial adjustment mechanisms, improving the sealing effect, withstanding the pressure impact of the conveyed medium, effectively preventing leakage, and making the sealing safer and more reliable.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A small-diameter pipe sealing device includes a sealing assembly, an axial movement mechanism, and a radial adjustment mechanism; the sealing assembly includes a sealing housing and a sealing structure disposed on the side wall of the sealing housing.

[0009] One end of the axial moving mechanism is rotatably connected to the bottom wall of the sealing housing, and the other end of the axial moving mechanism extends along the central axis of the sealing housing to the outside of the sealing housing; the axial moving mechanism drives the sealing housing to move horizontally and extend into the pipe to be sealed, while the sealing structure forms a primary seal with the inner wall of the pipe to be sealed.

[0010] The radial adjustment mechanism is located inside the sealing housing, with one end connected to the inner wall of the sealing housing and the other end movably connected to the axial movement mechanism; the radial expansion of the radial adjustment mechanism along the pipe to be sealed causes the sealing structure to form a compression seal with the inner wall of the pipe to be sealed.

[0011] Further defining the sealing structure, the sealing structure includes an interdental seal, a lip seal, and a sealing ring disposed on the outer wall of the sealing housing; the interdental seal, the lip seal, and the sealing ring are distributed sequentially along the direction of movement of the sealing housing into the pipe to be sealed.

[0012] Further specified, a first boss and a second boss are provided on the side wall of the sealing housing, and the first boss and the second boss are respectively arranged on both sides of the inter-tooth seal; the longitudinal height of the first boss is equal to the longitudinal height of the second boss.

[0013] Further specifying, the axial movement mechanism includes a moving screw, an axial drive component, and an axial connecting block;

[0014] The axial connecting block is located on the bottom wall of the sealing housing; one end of the movable screw passes through the axial connecting block and is rotatably connected to the sealing housing, and the other end of the movable screw is located outside the sealing housing along the central axis of the sealing housing; the axial driving component is sleeved on the screw; the rotation of the axial driving component drives the movable screw to rotate, thereby driving the screw sealing housing to move horizontally and extend into the pipe to be sealed; the other end of the radial adjustment mechanism is movably connected to the movable screw.

[0015] Further defined, the radial adjustment mechanism includes a radial support, a first sliding member, a second sliding member, a radial adjustment rod, a radial drive member, and a positioning block;

[0016] The radial support is disposed on the side wall of the sealed housing, and the first and second sliding members are both sleeved on the moving screw, with the first sliding member close to the axial connecting block;

[0017] The radial drive component is sleeved on the movable screw and located in contact with the second sliding component; the radial adjustment rod includes a first support rod group and a second support rod group, one end of the first support rod group and one end of the second support rod group are both connected to the same position on the radial support component, and the other end of the first support rod group is connected to the second sliding component; the positioning block is disposed on the movable screw and is located between the first sliding component and the axial connecting block.

[0018] The radial adjusting rod also includes a third support rod group; one end of each of the third support rod groups is connected to the first sliding member, and the other end of each of the third support rod groups is connected to the radial support member; the third support rod group and the second support rod group are arranged in parallel.

[0019] Furthermore, the first support rod group, the second support rod group, and the third support rod group are all composed of multiple support rods, and the multiple support rods in each group are evenly distributed in a circle in the radial direction of the moving screw.

[0020] Further specifying, the small-diameter pipe sealing device also includes a support and a clamp; the clamp is sleeved on the outer wall of the pipe to be sealed, one end of the support is connected to the clamp, and the other end of the support is connected to a movable screw.

[0021] Furthermore, the small-diameter pipe sealing device also includes a detection component disposed inside the sealing assembly.

[0022] The sealing method based on the aforementioned small-diameter pipe sealing device includes the following steps:

[0023] S1. Connect the clamp and sealing assembly into one unit using a bracket; place the clamp on the outer wall of the pipe to be sealed, ensuring that the central axis of the sealing assembly is at the same level as the central axis of the pipe, and then tighten the clamp.

[0024] S2. The drive axial movement mechanism drives the sealing housing to move horizontally and extend into the pipe to be sealed. During the movement, the sealing structure contacts the inner wall of the pipe to be sealed to form a primary seal until the sealing housing is fully extended into the pipe to be sealed.

[0025] S3. Drive the radial adjustment mechanism to expand radially along the pipe to be sealed, and adjust the sealing housing to move towards the inner wall of the pipe to be sealed, so that the sealing structure continuously squeezes the inner wall of the pipe to be sealed, thereby forming a tight seal with the inside of the pipe to be sealed, until the radial adjustment mechanism expands radially to the maximum stroke, and the seal is completed.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. The sealing device of the present invention is provided with a sealing component, an axial moving mechanism, and a radial adjusting mechanism; the axial moving mechanism drives the sealing component to move axially and extend into the pipe to achieve the initial sealing of the small-diameter pipe; the radial adjusting mechanism adjusts the radial expansion of the sealing component to form a compression seal between the sealing component and the small-diameter pipe; the dual action of initial sealing and compression sealing improves the sealing effect of the small-diameter pipe, while being able to withstand the pressure impact of the conveyed medium, effectively preventing leakage, and making the sealing safer and more reliable.

[0028] 2. The sealing assembly of the present invention includes a sealing housing and a sealing structure disposed on the side wall of the sealing housing. The sealing structure further includes an inter-tooth seal, a lip seal and a sealing ring. When the sealing assembly moves axially into the pipe, the inter-tooth seal, the lip seal and the sealing ring contact the inner wall of the pipe in sequence to form a three-stage preliminary seal, so that the sealing structure has good sealing performance and ensures that no leakage occurs during use.

[0029] 3. The present invention also includes a clamping device to compress and seal the pipeline, which makes the sealing device pressure resistant and can cope well with changes in air pressure inside the pipeline, making the seal safer and more reliable.

[0030] 4. The sealing device of the present invention should have a simple and compact structure, be easy to operate and maintain, and be able to work stably under different environmental conditions, reducing the risk of sealing failure or leakage due to equipment failure, and having higher reliability.

[0031] 5. The sealing device of the present invention has a radial adjustment function, which can adapt to the size range of small-diameter pipes of different diameters, making it more adaptable and suitable for sealing gas pipes or liquid pipes. Attached Figure Description

[0032] Figure 1 A schematic diagram of a small-diameter pipe sealing device provided by the present invention;

[0033] Figure 2 for Figure 1 The diagram on the left;

[0034] Figure 3 This is a schematic diagram of the sealing assembly;

[0035] Figure 4 This is a cross-sectional view of the interior of the sealing assembly;

[0036] Figure 5 Schematic diagram of radial adjustment structure and axial movement mechanism;

[0037] in:

[0038] 10-Pipe; 20-Support; 30-Pressure clamp; 40-Sealing assembly; 401-Sealing housing; 4011-Head; 4012-Sealing part; 402-First boss; 403-Second boss; 404-Interdental seal; 405-Lip seal; 406-Sealing ring; 50-Axial movement mechanism; 501-Moving screw; 502-Axial drive component; 503-Radial connecting block; 60-Radial adjustment structure; 601-Radial support component; 602-First sliding component; 603-Second sliding component; 604-Radial adjusting rod; 605-Radial drive component; 606-Positioning block; 70-Detection assembly; 80-Drive unit. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] Unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. It should be noted that the technical terms used in this invention are for describing particular embodiments only and are not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this invention, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. "Upper," "lower," "left," "right," etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0041] See Figure 1 In one possible embodiment of the present invention, the small-diameter pipe sealing device includes a sealing assembly 40, an axial movement mechanism 50, and a radial adjustment mechanism 60.

[0042] In this invention, the sealing assembly 40 includes a sealing housing 401 and a sealing structure disposed on the side wall of the sealing housing 401. One end of the axial moving mechanism 50 is rotatably connected to the bottom wall of the sealing housing 401, and the other end of the axial moving mechanism 50 extends along the central axis of the sealing housing 401 to the outside of the sealing housing 401; the axial moving mechanism 50 drives the sealing housing 401 to move horizontally and extend into the pipe 10 to be sealed, while the sealing structure forms a primary seal with the inner wall of the pipe 10 to be sealed.

[0043] In this invention, the radial adjustment mechanism 60 is located inside the sealing housing 401, and one end of the radial adjustment mechanism 60 is connected to the inner wall of the sealing housing 401, while the other end of the radial adjustment mechanism 60 is movably connected to the axial movement mechanism 50. The radial expansion of the radial adjustment mechanism 60 along the pipe 10 to be sealed causes the sealing structure to form a compression seal with the inner wall of the pipe 10 to be sealed.

[0044] See Figure 2 , Figure 3 and Figure 4 In one possible embodiment of the present invention, the sealing structure includes an interdental seal 404, a lip seal 405, and a sealing ring 406 disposed on the outer wall of the sealing housing 401; the interdental seal 404, the lip seal 405, and the sealing ring 406 are distributed sequentially along the direction of movement of the sealing housing 401 into the pipe 10 to be sealed.

[0045] See Figure 3 and Figure 4 In one possible embodiment of the present invention, a first boss 402 and a second boss 403 are provided on the side wall of the sealing housing 401, and the first boss 402 and the second boss 403 are arranged on both sides of the inter-tooth seal 404; the longitudinal height of the first boss 402 is equal to the longitudinal height of the second boss 403.

[0046] Preferably, the sealing housing 401 is a cylindrical structure consisting of a head 4011 and a sealing part 4012, with one end sealed and the other end open. One end of the head 4011 is the sealing end, and the other end of the head 4011 is connected to one end of the sealing part 4012 to form a whole, with the other end of the sealing part 4012 being the open end. A tooth seal 404, a lip seal 405, and a sealing ring 406 are sequentially disposed on the sidewall of the sealing part 4012, with the tooth seal 404 located close to the head 4011.

[0047] Preferably, the head 4011 is a frustum-shaped tubular structure, and the sealing part 4012 is a cylindrical tubular structure. The left end face of the head 4011 has a small diameter and is sealed, while the right end face of the head 4011 has a larger diameter. Both ends of the sealing part 4012 are open. The right end face of the head 4011 and the left end face of the sealing part 4012 are connected as one unit. The left port diameter of the sealing part 4012 is smaller, making it easier to insert into the pipe 10 first. A first boss 402 is provided on the outer wall of the connection end between the sealing part 4012 and the head 4011. The first boss 402 is integral with the head 4011. A second boss 403 is also provided on the side wall of the sealing part 4012. An inter-tooth seal 404 is provided on the side wall of the sealing part 4012 at a position between the first boss 402 and the second boss 403. The first boss 402, the inter-tooth seal 404 and the second boss 403 are all arranged in a ring on the side wall of the sealing part 4012, and the outer end faces of the inter-tooth seal 404, the first boss 402 and the second boss 403 are flush. Specifically, the interdental seal 404 is a rigid seal, positioned between the first boss 402 and the second boss 403. The interdental seal 404 comprises multiple sets of sequentially arranged comb-like structures, achieving progressive pressure reduction and improved sealing through multiple throttling gaps and expansion cavities. For example, the interdental seal 404 may have three sets of sequentially arranged comb-like structures, but it can also have two, four, five, or more sets.

[0048] In this invention, the lip seal 405 and the sealing ring 406 are sleeved on the side wall of the sealing part 4012 and located to the right of the second boss 403. The longitudinal height of the lip seal 405 and the longitudinal height of the sealing ring 406 are lower than the height of the second boss 403, and the resulting height difference provides deformation for the lip seal 405 and the sealing ring 406. While the lip seal 405 achieves sealing by elastically deforming and tightly adhering to the contact surface, it can also act as a scraper to remove impurities such as dust and metal shavings from the contact surface, avoid wear, and improve sealing performance.

[0049] Preferably, the lip seal 405 is a multi-lip seal ring. For example, the lip seal 405 is a double-lip seal ring, but it can also be a triple-lip seal ring, a quadruple-lip seal ring, or a pentalip seal ring.

[0050] Preferably, there are multiple sealing rings 406. For example, there are three, four, five or more sealing rings 406. The sealing rings 406 can be O-rings or other types of sealing rings. To facilitate the installation of the sealing rings 406, a groove is formed on the outer wall of the sealing housing 401. The sealing rings 406 are fitted onto the outer wall of the sealing housing 401 through the groove, thereby improving the sealing stability.

[0051] Preferably, the sealing housing 401 is made of stainless steel or aluminum alloy, but other high-strength metal materials can also be used. The inter-tooth seal 404 is made of metal, and the lip seal 405 is made of rubber, preferably nitrile rubber, silicone rubber or polytetrafluoroethylene. The sealing ring 406 is made of high-temperature resistant, high-pressure resistant and corrosion resistant rubber or Teflon and other materials.

[0052] See Figure 3 and Figure 5 In one possible embodiment of the present invention, the axial moving mechanism 50 includes a moving screw 501, an axial driving member 502, and an axial connecting block 503; the axial connecting block 503 is located on the bottom wall of the sealing housing 401; one end of the moving screw 501 passes through the axial connecting block 503 and is rotatably connected to the sealing housing 401, and the other end of the moving screw 501 is located outside the sealing housing 401 along the central axis of the sealing housing 401; the axial driving member 502 is sleeved on the screw 402; the rotation of the axial driving member 502 drives the moving screw 501 to rotate, thereby driving the sealing housing 401 to move horizontally and extend into the pipe 10 to be sealed; the other end of the radial adjusting mechanism 60 is movably connected to the moving screw 501.

[0053] In this embodiment, the axial drive component 502 is preferably an adjusting nut, which is threaded onto the movable screw 501. Since one end of the movable screw 501 is rotatably connected to the bottom wall of the sealing housing 401 via a thread, rotating the adjusting nut outside the sealing housing 401 causes the movable screw 501 to rotate, thereby driving the sealing housing 401 to move axially and extend into the pipe 10. The rotation of the adjusting nut can be done manually or mechanically, preferably mechanically. In this case, a drive unit 80 is provided, which is electrically connected to the axial drive component 502. The drive unit 80 drives the axial drive component 502 to rotate. The axial drive component 502 can also be any other drive structure that drives the movable screw 501 to rotate.

[0054] Preferably, a non-penetrating threaded countersunk hole is formed on the closed end of the sealing housing 401, and one end of the moving screw 501 passes through the axial connecting block 503 and is threadedly connected to the threaded countersunk hole.

[0055] See Figure 3 and Figure 5In one possible embodiment of the present invention, the radial adjustment mechanism 60 includes a radial support 601, a first sliding member 602, a second sliding member 603, a radial adjustment rod 604, a radial drive member 605, and a positioning block 606; the radial support 601 is disposed on the side wall of the sealing housing 401; the first sliding member 602 and the second sliding member 603 are both sleeved on the moving screw 501, with the first sliding member 602 close to the positioning block 606; the radial drive member 605 is sleeved on the moving screw 501 and is located and abuts against the second sliding member 603; the radial adjustment rod 604 includes a first support rod assembly 6041 and a second support rod assembly 6041. The strut assembly 6042 has one end of the first support rod assembly 6041 and one end of the second support rod assembly 6042 connected to the same position on the radial support member 601. The other end of the first support rod assembly 6041 is connected to the second sliding member 603, and the other end of the second support rod assembly 6042 is connected to the first sliding member 602. A positioning block 606 is mounted on the moving screw 501, located between the first sliding member 602 and the axial connecting block 503. In practice, the positioning block 606 on the moving screw 501 corresponds to the position of the second boss 403 on the sealing housing 401. This ensures that when the radial expansion seal is at its maximum, the second sliding member 603 of the radial adjustment mechanism 60 moves horizontally to the corresponding position of the second boss 403, improving sealing stability.

[0056] Preferably, the radial support 601 has a cylindrical structure, in which case the radial support 601 and the sealing housing 401 are fitted together from the inside out. The first support rod group 6041 and the second support rod group 6042 are both composed of multiple support rods, and the multiple support rods in each group are evenly distributed in a circle in the radial direction of the moving screw 501.

[0057] Preferably, the radial support 601 is a plate-shaped structure; at this time, the number of radial support 601 is equal to the number of support rods in the first support rod group 6041, and the multiple radial support 601 are evenly distributed in a circle on the inner wall of the sealing housing 401, and the multiple support rods are evenly distributed in a circle around the radial direction of the moving screw 501, and the setting positions of the multiple radial support 601 and the setting positions of the multiple support rods correspond one-to-one.

[0058] In this embodiment, the radial drive member 605 is preferably an adjusting nut. The adjusting nut is threaded onto the moving screw 501. When the adjusting nut rotates, it first drives the second sliding member 603 to move toward the sealing end of the sealing housing 401, thereby driving the first support rod group 6041 to expand radially. At the same time, the second support rod group 6042 drives the first sliding member 602 to move toward the sealing end of the sealing housing 401 until it abuts against the positioning block 606. Since the positioning block 606 is fixed to the moving screw 501, the first sliding member 602 and the second sliding member 603 stop sliding at this time, and the radial expansion of the radial adjusting rod 604 reaches its maximum, that is, the radial adjusting mechanism 60 is radially adjusted to its maximum stroke.

[0059] In this invention, the rotation of the radial drive member 605 can be operated manually or mechanically, preferably mechanically. In this case, a drive unit 80 is provided, which is electrically connected to the radial drive member 605, and the drive unit 80 drives the radial drive member 605 to rotate. The radial drive member 605 can also be other drive structures that drive the radial adjusting rod 604 to expand radially.

[0060] In this invention, the drive unit 80 can be implemented by means of a manual screw, hydraulic cylinder or pneumatic cylinder, etc.

[0061] In one possible embodiment of the present invention, the radial adjusting rod 604 further includes a third support rod group 6043; one end of each of the third support rod groups 6043 is connected to the first sliding member 602, and the other end of each of the third support rod groups 6043 is connected to the radial support member 601; the third support rod group 6043 and the second support rod group 6042 are arranged in parallel. In use, one end of each of the second support rod groups 6042 is connected to one end of the first sliding member 602, and one end of each of the third support rod groups 6043 is connected to the other end of the first sliding member 602; by providing the third support rod group 6043, the stability of the radial adjusting rod 604 during radial expansion is increased.

[0062] In one possible embodiment of the present invention, the third support rod group 6043 is composed of multiple support rods, which are evenly distributed in a circle in the radial direction of the movable screw 501.

[0063] See Figure 1 and Figure 2 In one possible embodiment of the present invention, the small-diameter pipe sealing device further includes a support 20 and a clamping device 30; the clamping device 30 is sleeved on the outer wall of the pipe 10 to be sealed, one end of the support 20 is connected to the clamping device 30, and the other end of the support 20 is connected to the movable screw 501.

[0064] Preferably, the bracket 20 is made of a high-strength metal material (such as aluminum alloy, stainless steel, etc.) to support all components of the sealing device and ensure the stability of the device during operation. Specifically, one end of the bracket 20 is fixed to the pipe 10 and secured to the pipe 10 using a clamping device 30. The bracket 20 is fixed to the clamping device 30 and connected to the sealing assembly 40, providing support for the sealing assembly 40. The sealing assembly 40 can be fixed to the bracket 20 by threads, snaps, or other connection methods to ensure that it does not loosen during operation.

[0065] In one possible embodiment of the present invention, there are multiple supports 20, which are evenly distributed on the clamping device 30.

[0066] Preferably, see Figure 2 The clamping device 30 has a square structure, and there are four supports 20, one on each side of the clamping device 30. The supports 20 are rectangular or right-angled trapezoidal structures with openings at the top.

[0067] See Figure 1 In one possible embodiment of the present invention, the small-diameter pipe sealing device further includes a detection component 70 disposed on the inner wall of the sealing housing 401.

[0068] The present invention also provides a sealing method for a small-diameter pipe sealing device, comprising the following steps:

[0069] S1. Connect the clamping device 30 and the sealing assembly 40 into one unit through the bracket 20; put the clamping device 30 on the outer wall of the pipe 10 to be sealed, and ensure that the central axis of the sealing assembly 40 is at the same level as the central axis of the pipe 10, and tighten the clamping device 30.

[0070] S2. The drive axial movement mechanism 50 drives the sealing housing 401 to move in the horizontal direction and extend into the pipe 10 to be sealed. During the movement, the sealing structure contacts the inner wall of the pipe 10 to be sealed to form a primary seal until the sealing housing 401 is fully extended into the pipe 10 to be sealed.

[0071] S3. Drive the radial adjustment mechanism 60 to expand radially along the pipe 10 to be sealed, and adjust the sealing housing 401 to move towards the inner wall of the pipe 10 to be sealed, so that the sealing structure continuously squeezes the inner wall of the pipe 10 to be sealed, thereby forming a tight seal with the pipe 10 to be sealed, until the radial adjustment mechanism 60 expands radially to the maximum stroke, and the seal is completed.

[0072] The following explanation will be based on the example of sealing small-diameter natural gas pipelines.

[0073] Pipeline 10 is a small-diameter pipeline used to transport natural gas. In this case, pipeline 10 needs to be sealed. Pipeline 10 is positioned on the left, and sealing component 40 is located on the right. Sealing component 40 moves to the left and extends deeply into pipeline 10 to complete the seal. The specific sealing process is as follows:

[0074] First, the clamping device 30 is fitted onto the outer wall of the pipe 10 to be sealed. One end of each of the four supports 20 is connected to and secured to the four sides of the clamping device 30. The other ends of the four supports 20 are connected to and secured to the moving screw 501 of the axial moving mechanism 50. Since the moving screw 501 is connected to the sealing assembly 40, the four supports 20 are used to support the sealing assembly 40. At the same time, the central axis of the sealing assembly 40 and the central axis of the pipe 10 are at the same level, and the clamping device 30 is pressed.

[0075] Secondly, the drive unit 80 drives the axial drive component 502 to rotate, thereby driving the moving screw 501 to rotate, which in turn drives the sealing housing 401 to move to the left in the axial direction. The head 4011 of the sealing housing 401 first extends into the pipe 10. As the axial drive component 502 continues to rotate, the sealing housing 401 extends into the pipe 10 as a whole. During the movement of the sealing housing 401, the tooth seal 404, lip seal 405 and sealing ring 406 on the side wall of the sealing part 4012 contact the inner wall of the pipe 10 in sequence to form a three-level preliminary seal.

[0076] Finally, the drive unit 80 drives the radial drive member 605 to rotate, first driving the second sliding member 603 to move to the left towards the sealing end of the sealing housing 401, and simultaneously driving the first support rod group 6041 to expand radially. Since one end of the first support rod group 6041 and the second support rod group 6042 are connected to the same position on the radial support member 601, the second support rod group 6042 drives the first sliding member 602 to also move to the left side of the sealing end of the sealing housing 401. The movement of the first sliding member 602 also drives the third support rod group 6043 to expand radially; continuously driving the radial drive member 605 to rotate until the first The sliding member 602 moves to the positioning block 606 and abuts against the positioning block 606. Since the positioning block 606 is fixed to the moving screw 501, the first sliding member 602 and the second sliding member 603 stop sliding. The radial expansion of the radial adjustment rod 604 reaches its maximum, that is, the radial adjustment mechanism 60 is radially adjusted to its maximum stroke. The radial expansion of the sealing structure is adjusted by the radial adjustment rod 604. Since the lip seal 405 and the sealing ring 406 are made of soft material, the radial expansion of the lip seal 405 and the sealing ring 406 is adjusted so that the lip seal 405 and the sealing ring 406 form a tight seal with the inside of the pipe 10 to be sealed.

[0077] When it is necessary to remove the sealing device, first shut off the natural gas supply to pipeline 10, then slowly loosen the clamp 30 to separate the sealing assembly 40 from the end of pipeline 10. Finally, remove the clamp 30 and remove the sealing device from pipeline 10.

[0078] The small-diameter pipeline sealing device provided by this invention has the advantages of simple operation, safety and reliability, and strong adaptability. It can improve the maintenance efficiency and safety of natural gas pipelines and is suitable for temporary sealing or maintenance operations of small-diameter pipelines.

[0079] It should be noted that all equipment components used in this invention are commercially available and conventional in the field, and these devices can all meet the technological requirements for strength, pressure, etc., during operation. Furthermore, the connection and installation methods of each component are conventional and known technologies in the field, and will not be described in detail here.

[0080] It should be noted that the small-diameter pipe of the present invention refers to a pipe used in industry to transport gaseous or fluid media.

[0081] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A small-diameter pipe sealing device, characterized in that, It includes a sealing assembly (40), an axial movement mechanism (50), and a radial adjustment mechanism (60); the sealing assembly (40) includes a sealing housing (401) and a sealing structure disposed on the side wall of the sealing housing (401); One end of the axial moving mechanism (50) is rotatably connected to the bottom wall of the sealing housing (401), and the other end of the axial moving mechanism (50) extends along the central axis of the sealing housing (401) to the outside of the sealing housing (401); the axial moving mechanism (50) drives the sealing housing (401) to move in the horizontal direction and extend into the pipe (10) to be sealed, while the sealing structure forms a primary seal with the inner wall of the pipe (10) to be sealed; The radial adjustment mechanism (60) is located inside the sealing housing (401), and one end of the radial adjustment mechanism (60) is connected to the inner wall of the sealing housing (401), while the other end of the radial adjustment mechanism (60) is movably connected to the axial movement mechanism (50). The radial expansion of the radial adjustment mechanism (60) along the pipe (10) to be sealed causes the sealing structure to form a compression seal with the inner wall of the pipe (10) to be sealed.

2. The small-diameter pipe sealing device according to claim 1, characterized in that, The sealing structure includes an interdental seal (404), a lip seal (405), and a sealing ring (406) disposed on the outer wall of the sealing housing (401); the interdental seal (404), the lip seal (405), and the sealing ring (406) are distributed sequentially along the direction of movement of the sealing housing (401) into the pipe (10) to be sealed.

3. The small-diameter pipe sealing device according to claim 2, characterized in that, The sealing housing (401) has a first boss (402) and a second boss (403) on its side wall. The first boss (402) and the second boss (403) are arranged on both sides of the inter-tooth seal (404). The longitudinal height of the first boss (402) is equal to the longitudinal height of the second boss (403).

4. The small-diameter pipe sealing device according to claim 3, characterized in that, The axial movement mechanism (50) includes a moving screw (501), an axial drive component (502), and an axial connecting block (503); The axial connecting block (503) is located on the bottom wall of the sealing housing (401); one end of the movable screw (501) passes through the axial connecting block (503) and is rotatably connected to the sealing housing (401), and the other end of the movable screw (501) is located outside the sealing housing (401) along the central axis of the sealing housing (401); the axial driving member (502) is sleeved on the screw (402); the axial driving member (502) rotates to drive the movable screw (501) to rotate, thereby driving the sealing housing (401) to move horizontally and extend into the pipe (10) to be sealed; the other end of the radial adjustment mechanism (60) is movably connected to the movable screw (501).

5. The small-diameter pipe sealing device according to claim 4, characterized in that, The radial adjustment mechanism (60) includes a radial support (601), a first sliding member (602), a second sliding member (603), a radial adjustment rod (604), a radial drive member (605), and a positioning block (606); The radial support (601) is disposed on the side wall of the sealing housing (401), and the first sliding member (602) and the second sliding member (603) are both sleeved on the moving screw (501), with the first sliding member (602) close to the positioning block (606). The radial drive member (605) is sleeved on the movable screw (501) and is located and abuts against the second sliding member (603); the radial adjusting rod (604) includes a first support rod group (6041) and a second support rod group (6042), one end of the first support rod group (6041) and one end of the second support rod group (6042) are both connected to the same position on the radial support member (601), and the other end of the first support rod group (6041) is connected to the second sliding member (603); the other end of the second support rod group (6042) is connected to the first sliding member (602); The positioning block (606) is disposed on the moving screw (501). The positioning block (606) is located between the first sliding member (602) and the axial connecting block (503), and is at the same horizontal position as the second boss (403).

6. The small-diameter pipe sealing device according to claim 5, characterized in that, The radial adjusting rod (604) also includes a third support rod group (6043); one end of the third support rod group (6043) is connected to the first sliding member (602), and the other end of the third support rod group (6043) is connected to the radial support member (601); the third support rod group (6043) and the second support rod group (6042) are arranged in parallel.

7. The small-diameter pipe sealing device according to claim 6, characterized in that, The first support rod group (6041), the second support rod group (6042) and the third support rod group (6043) are each composed of multiple support rods, and the multiple support rods of each group are evenly distributed in a circle in the radial direction of the moving screw (501).

8. The small-diameter pipe sealing device according to claim 7, characterized in that, The small-diameter pipe sealing device also includes a bracket (20) and a clamp (30); the clamp (30) is sleeved on the outer wall of the pipe (10) to be sealed, one end of the bracket (20) is connected to the clamp (30), and the other end of the bracket (20) is connected to the moving screw (501).

9. The small-diameter pipe sealing device according to claim 8, characterized in that, The small-diameter pipe sealing device also includes a detection component (70) disposed inside the sealing component (40).

10. A sealing method based on the small-diameter pipe sealing device according to claim 9, characterized in that, The sealing method includes the following steps: S1. Connect the clamp (30) and the sealing assembly (40) into one unit through the bracket (20); put the clamp (30) on the outer wall of the pipe (10) to be sealed, and ensure that the central axis of the sealing assembly (40) is at the same level as the central axis of the pipe (10), and tighten the clamp (30); S2. The drive axial movement mechanism (50) drives the sealing housing (401) to move in the horizontal direction and extend into the pipe (10) to be sealed. During the movement, the sealing structure contacts the inner wall of the pipe (10) to be sealed to form a primary seal until the sealing housing (401) is fully extended into the pipe (10) to be sealed. S3. Drive the radial adjustment mechanism (60) to expand radially along the pipe (10) to be sealed, and adjust the sealing housing (401) to move towards the inner wall of the pipe (10) to be sealed, so that the sealing structure continuously squeezes the inner wall of the pipe (10) to be sealed, and then forms a tight seal with the inside of the pipe (10) to be sealed, until the radial adjustment mechanism (60) expands radially to the maximum stroke, and the seal is completed.

Images