A pressure-bearing sealing airbag for pipelines

Abstract

The present invention discloses a pressure-bearing pipe sealing airbag, belonging to the technical field of high-pressure pipeline maintenance, sealing, and other construction operations. The sealing airbag comprises a main body, an end cap, an annular airbag, a mounting ring, and a safety valve. One or more annular airbags are mounted on a step of the main body. The inner opening of the annular airbag is provided with a 180-degree rotating flange. The safety valve is installed in the ventilation cavity of the main body and is used to close the corresponding ventilation hole when the annular airbag is damaged. The guide positioning rod is movably installed in a straight slide groove, and the rotation of the drive disk can drive the multiple guide positioning rods to synchronously extend and retract. Compared with existing solutions, this structure adopts a series structure of multiple airbags, which can ensure that the entire sealing is not lost even if the front airbag is damaged. The configured guide positioning rod can ensure the stability of the axis during expansion and reliably guide the airbag to the designated position in the pipeline. Compared with traditional airbags, the internal pressure of the airbag can be increased by more than 55%, and the sealing pressure can reach above 1.8MPa.

Description

Technical Field

[0001] The invention belongs to the technical field of high-pressure pipeline maintenance, plugging and other construction operations, and in particular relates to a pressure-bearing plugging airbag for pipelines. Background Art

[0002] In the technical fields of oil and gas pipelines and drainage pipelines, it is often necessary to seal specific pipelines to achieve pipeline maintenance, sealing and other construction operations. Since the sealing airbag has an adjustable diameter and strong adaptability, it has broad application prospects in the field of pipeline sealing.

[0003] For example, to ensure water supply safety and the normal progress of maintenance work, a large number of hydraulic equipment such as air valves, butterfly valves, expansion joints, and drain ball valves are installed on PCCP water pipelines. Traditional water pipeline maintenance and emergency repairs require that equipment be repaired or replaced by closing the upstream and downstream stop valves and draining the pipes using drainage equipment before repair work can begin. After the work is completed, the drained pipes must be refilled with water, extending water outages. The preparation time for draining and refilling can even be 8 to 10 times longer than the normal time required to replace equipment, directly impacting the normal water supply to downstream receiving cities. In this case, using pipeline plugging airbags allows equipment to be repaired and replaced without draining the pipes, avoiding the damage caused by repeated water filling and significantly shortening repair work time.

[0004] Another example: During the construction of long-distance oil and gas pipelines and city gas pipelines, pipeline bevels are prefabricated by the manufacturer or fabricated on-site in advance. Due to the large scale and long construction period, each work area is divided according to the construction nodes. After each day's construction is completed, there will be unwelded pipeline bevels (commonly known as leftover heads). If not sealed, animals, dust, rocks and sand will enter the pipeline at night, potentially damaging the pipeline or affecting subsequent pressure testing and pigging processes. Therefore, technicians need a sealing device with the right size and strong pressure bearing capacity not only during the initial construction process, but also during later maintenance and inspection of specific pipelines. In this case, if equipped with a suitable sealing airbag, the sealing can be achieved quickly, significantly saving construction time and improving work efficiency.

[0005] In the prior art, although some technicians have proposed technical solutions for pipeline blocking airbags, through specific analysis and research, it has been found that the existing blocking airbags still have the following technical problems when working under pressure:

[0006] 1) When the airbag expands under pressure, its axis is easily deflected under the action of pressure and external force, which can easily lead to asymmetric contact between the airbag and the inner wall of the pipe, uneven force, and stress concentration points on the outer contour of the end, resulting in a rapid decrease in the overall pressure-bearing capacity. At this time, the deformation of the airbag end will further cause pressurized liquid or gas to enter the airbag side wall, quickly reducing the friction between its overall outer wall and the inner wall of the pipe. When the external force on the airbag is greater than the friction, the airbag will slip as a whole and the airbag sealing will fail.

[0007] 2) Existing sealing airbags generally adopt a single airbag structure. The working conditions of the inner wall of the pipeline are complex. During the expansion and sealing process, the airbag is easily damaged if it encounters burrs or scratches on the inner wall. If it encounters collisions or scratches from foreign objects, it is easy to cause sealing failure due to local damage.

[0008] 3) In existing sealing airbags, the outer wall is smooth, resulting in insufficient friction between the rubber and the tube wall, which in turn reduces the maximum sealing pressure. In addition, the inner opening end of the airbag generally adopts a 90° flange. During the sealing process, when the pressure in the tube continues to increase, the cross-section of the rubber airbag end face will rapidly narrow, causing the rubber airbag to easily fall off from the support structure and fail.

[0009] 4) Existing plugging airbags are generally not equipped with guiding and positioning devices. When it is necessary to plug internal pipes, steel wire ropes and pulleys are usually used for traction. For example, to plug the pipe between the drain well and the drainage well, the airbag needs to be sent to the specified position and the dragging should be stopped when the air inlet end of the airbag is about 2.50m away from the valve flange. At this time, technical requirements such as whether the airbag is tilted as a whole and whether the airbag is located at the axis of the pipe cannot be guaranteed.

[0010] How to solve the above problems faced by existing airbags is a technical difficulty in further improving the sealing quality of airbags and expanding the scope of airbag applications. Summary of the Invention

[0011] In response to the above technical problems, the present invention provides a pressure-bearing sealing airbag for pipelines. The structure adopts a series structure of multiple airbags, which can ensure that the overall sealing will not fail even if the front airbag is damaged. The configured guide positioning rod can ensure the stability of the axis when it is expanded and reliably guide the airbag into the designated position of the pipeline. Compared with traditional airbags, the internal sealing pressure of the airbag can be increased by more than 55%, and the sealing pressure can reach more than 1.8MPa.

[0012] The present invention solves the above problems through the following technical means:

[0013] A pressure-bearing airbag for a pipeline, characterized by comprising a main body, an end cover, an annular airbag, a mounting ring, a spacer ring, a safety valve, a mounting seat, a guide and positioning rod, a drive disc, and a drive rod, wherein:

[0014] The main body is a cylindrical structure, one end of the main body is provided with a positioning ring platform, the main body forms a step on the inner side of the positioning ring platform, the main body is provided with a center hole along the axis, the end of the center hole is provided with a threaded hole, the main body is also provided with an axial ventilation main hole and a plurality of radial ventilation sub-holes, the inner ends of the ventilation sub-holes are connected to the ventilation main hole, the outer ends of the ventilation sub-holes are provided with a ventilation cavity, the top of the inner wall of the ventilation cavity is tapped, and the outer end of the ventilation main hole is provided with a ventilation nozzle;

[0015] The end cover is installed in the threaded hole through a threaded end, and the end cover is provided with an end hole along the axial direction;

[0016] One or more annular airbags are sleeved on the step, with both sides of the annular airbag limited by a positioning ring platform and an end cover. Spacer rings are provided between the multiple annular airbags. A 180° rotating flange is provided at the inner opening of the annular airbag, and a raised sealing ring is provided on the outer side of the annular airbag for contacting and sealing the pipe wall.

[0017] The mounting ring is sleeved on the step and is located inside the annular airbag. The mounting ring is used to support and seal the annular airbag. A vent is opened on the surface of the mounting ring. The vent is located above the ventilation cavity. A positioning boss is provided in the middle of the inner wall of the mounting ring. Steps on both sides of the positioning boss form an installation cavity for installing the annular airbag. A limiting ring groove is provided at the bottom of the installation cavity. The limiting ring groove is used to install the 180° rotation flange of the annular airbag.

[0018] The safety valve is installed in the ventilation cavity and is used to close the corresponding ventilation hole when the annular airbag is damaged;

[0019] The outer ends of the positioning ring platform and the end cover are both machined to have mounting seats, and the mounting seats include a plurality of radially arranged and symmetrically arranged straight sliding grooves;

[0020] The guide positioning rod is movably installed in the straight slide groove;

[0021] A driving disc is provided at the outer end of the mounting seat, and the rotation of the driving disc can drive multiple guide positioning rods on the same plane to extend and retract synchronously;

[0022] The driving rod passes through the center of the top driving disk, the center of the top positioning cover, the center hole of the main body, the end hole of the end cover, the center of the bottom positioning cover and the center of the bottom driving disk in sequence. By rotating the driving rod, the driving disks at both ends can be driven to rotate synchronously.

[0023] Preferably, the safety valve includes a waist-shaped nut with a hole, a vent groove, a movable shaft, a chassis, a sealing cone head, a valve body sealing ring, a vent hole, a sealing compression spring, a fixed magnetic ring and a moving magnetic ring, wherein:

[0024] The waist-shaped nut with a hole is installed in the ventilation cavity, and the ventilation groove is formed between the waist of the waist-shaped nut with a hole and the inner wall of the ventilation cavity;

[0025] The movable shaft is movably installed in the middle hole of the waist-shaped nut with a hole;

[0026] The chassis is arranged at the bottom of the movable shaft, and a clearance fit is adopted between the chassis and the ventilation cavity, with the clearance being 0.20 mm to 1.50 mm;

[0027] The sealing cone head is arranged on the lower side of the chassis, the size of the sealing cone head is consistent with the size of the ventilation hole, and the sealing cone head is provided with a valve body sealing ring;

[0028] The valve body sealing ring is tightly fitted with the chassis and has the same size. A plurality of vent holes are symmetrically opened around the valve body sealing ring and the chassis.

[0029] The sealing compression spring is installed between the chassis and the waist-shaped nut with a hole;

[0030] The fixed magnetic ring is sleeved on the movable shaft and fixedly connected to the waist-shaped nut with a hole;

[0031] The moving magnetic ring is sleeved on the moving shaft and fixedly connected to the chassis;

[0032] When there is no external force, the fixed magnetic ring and the moving magnetic ring attract each other, the magnetic attraction force is greater than the elastic force of the sealing compression spring, and the sealing cone head is away from the ventilation hole;

[0033] When the pressure in the vent suddenly increases, the force on the side of the chassis close to the vent groove increases. When the sum of the outer pressure and the elastic force of the sealing compression spring is greater than the magnetic attraction force, the fixed magnetic ring and the moving magnetic ring separate from each other, and the sealing cone head enters the vent hole and cooperates with the valve body sealing ring to complete the sealing of the vent hole.

[0034] Preferably, a positioning ring groove is provided on the outer edge of the mounting seat, and a positioning ring is installed on the positioning ring groove. The top of the positioning ring is flush with the top of the mounting seat. The positioning ring is used to prevent the guide positioning rod from falling off. The mounting seat is also provided with an air nozzle hole for connecting the ventilation nozzle.

[0035] Preferably, the guide positioning rod includes a transverse sliding rod, a roller, a vertical transmission rod, a sliding sleeve and a limit nut, wherein: the outer end of the transverse sliding rod is equipped with a roller, the inner end of the transverse sliding rod is connected to the vertical transmission rod, and the transverse sliding rod and the vertical transmission rod constitute an L-shaped sliding rod; the top of the vertical transmission rod is equipped with a sliding sleeve, and the end of the vertical transmission rod is equipped with a limit nut.

[0036] Preferably, a limiting hole is provided in the middle of the driving disk, and three or four driving arc grooves are symmetrically provided on the driving disk. The driving arc grooves are sleeved on the sliding sleeve and positioned by a limiting nut. The driving disk is also provided with an air nozzle arc groove for installing an inflation nozzle, wherein:

[0037] During the process of the driving disc rotating at a constant speed of 35° to 55°, the sliding sleeve and the vertical transmission rod also move from the bottom end to the top end, and the envelope of the projection of the outer contour of the sliding sleeve on the driving disc forms the inner contour of the driving arc groove;

[0038] The air nozzle arc groove is arranged concentrically with the driving disc.

[0039] Preferably, a spline is provided on the flange of the limiting hole of the driving disk, and the spline cooperates with the keyway on the driving rod for transmission.

[0040] Preferably, a driving head is installed at the end of the driving rod, threaded sections are provided at both ends of the driving rod, and a preload spring is provided between the driving head and the driving disc at the top.

[0041] Preferably, it further comprises a positioning rod, which is divided into a positioning hose and a positioning straight rod, wherein:

[0042] The positioning rod is provided with a scale, and a vent pipe is arranged inside the positioning rod;

[0043] The end of the positioning rod is connected to the connector of the driving head through the mounting head, the mounting head is provided with a connecting nozzle, and the vent pipe is connected to the vent nozzle through the connecting nozzle and the external hose;

[0044] The positioning hose consists of a leather cover and a snake bone of the leather cover.

[0045] Preferably, a transmission sealing structure is sleeved on the middle part of the driving rod, and the transmission sealing structure is used to dynamically seal the gap between the driving rod and the center hole. The transmission sealing structure includes two structures:

[0046] Structure 1: The transmission sealing structure includes two high-pressure sealing rings, which are arranged oppositely in the sealing groove of the driving rod;

[0047] Structure 2: The transmission sealing structure includes two high-pressure sealing rings and three wear-resistant rings. The two high-pressure sealing rings are arranged between the three wear-resistant rings respectively.

[0048] Preferably, the high-pressure sealing ring includes an outer retaining ring, an inner contact ring, an outer sealing ring and a V-shaped support spring, wherein:

[0049] The inner contact ring is tightly fitted on the sealing groove of the drive rod, and one end of the inner contact ring is tilted and tilted to form an outer retaining ring, which is used to block dust and large particles of debris. The other end of the inner contact ring extends upward to form an outer sealing ring. A V-shaped support spring is installed inside the outer sealing ring. The inner contact ring and the outer retaining ring are at the same height. The horizontal angle β of the outer retaining ring ranges from 60° to 85°, and the middle angle α of the outer sealing ring ranges from 25° to 40°. Both the outer retaining ring and the outer sealing ring can achieve self-sealing under pressure.

[0050] The pressure-bearing sealing airbag for pipelines of the present invention has the following beneficial effects:

[0051] The sealing connection between the annular airbag and the internal mounting ring utilizes a 180° folded flange, increasing the contact surface and friction, significantly improving sealing performance. Compared to traditional 90° folding solutions, this significantly increases the internal pressure of the airbag seal. This solves the technical problem of increased internal tube pressure narrowing the cross-section of the rubber airbag end face during the sealing process, which can lead to the rubber airbag easily falling off or leaking and failing. Furthermore, multiple raised sealing rings are symmetrically arranged on the exterior of the annular airbag, increasing the friction between the outer wall of the airbag and the inner tube wall.

[0052] 2) The airbag is equipped with guide and positioning structures at both ends, with rollers installed at each end. This facilitates the airbag's entry into the designated position within the pipe, guided by the positioning rod. The adjustable length of the guide and positioning rod ensures that the airbag's axis remains aligned with the pipe axis, even in pipes of varying diameters. This resolves the technical issues of overall airbag tilt and uneven force distribution caused by existing wire rope traction. During the sealing and expansion process, the airbag's axis remains stable and stabilised, ensuring symmetry and uniform force distribution between the contact surface between the airbag and the pipe inner wall. This improves the overall pressure-bearing capacity and avoids stress concentration points on the outer contour of the end.

[0053] 3) The blocking airbag utilizes multiple coaxially connected airbags in series and is equipped with a safety valve, making it suitable for high-pressure and complex environments. Even if one airbag is damaged by a burr or foreign object scratching the inner wall, the remaining airbags can still independently block the blockage, achieving a blocking pressure exceeding 1.8 MPa. In particular, the safety valve automatically blocks the airbag in the event of a sudden change in internal pressure, preventing the entire airbag from failing.

[0054] 4) A new sealing solution is arranged between the driving rod and the center hole of the main body of the sealing airbag. The sealing solution uses multiple wear-resistant rings and high-pressure sealing rings to improve its sealing and coaxiality, which can effectively prevent liquid and gas leakage inside the pipeline at a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0056] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0057] Figure 2 It is a schematic diagram of the main structure of the present invention;

[0058] Figure 3 It is a schematic diagram of the annular airbag and the mounting ring structure of the present invention;

[0059] Figure 4 This is a schematic diagram of the assembly of the annular airbag and the mounting ring of the present invention;

[0060] Figure 5 It is a schematic structural diagram of the safety valve of the present invention;

[0061] Figure 6 This is a schematic structural diagram of a waist-shaped nut with a hole according to the present invention;

[0062] Figure 7 It is a schematic diagram of the movable shaft and chassis structure of the present invention;

[0063] Figure 8 It is a schematic diagram of the vent structure of the present invention;

[0064] Figure 9 This is a schematic diagram of the safety valve operation of the present invention;

[0065] Figure 10 This is a schematic diagram of the safety valve reset of the present invention;

[0066] Figure 11 This is a schematic diagram of the application of the safety valve of the present invention;

[0067] Figure 12 This is a schematic diagram of the installation of the mounting base, guide positioning rod and drive disc of the present invention;

[0068] Figure 13 This is a working schematic diagram of the guide positioning rod of the present invention;

[0069] Figure 14 It is a schematic structural diagram of the guide positioning rod of the present invention;

[0070] Figure 15 It is a schematic diagram of the driving rod structure of the present invention;

[0071] Figure 16 It is a schematic structural diagram of the positioning hose of the present invention;

[0072] Figure 17 It is a schematic diagram of the positioning straight rod structure of the present invention;

[0073] Figure 18 It is a schematic diagram of the first transmission sealing solution of the present invention;

[0074] Figure 19 is a schematic diagram of a second transmission sealing solution of the present invention;

[0075] Figure 20 It is a schematic structural diagram of the high-pressure sealing ring of the present invention;

[0076] Figure 21 It is an angle diagram of the high-pressure sealing ring of the present invention.

[0077] Among them, 1-main body, 101-positioning ring platform, 102-step, 103-center hole, 104-threaded hole, 105-vent main hole, 106-vent branch hole, 107-vent cavity, 108-vent nozzle, 2-end cover, 201-threaded end, 202-end hole, 3-annular airbag, 301-180°rotation flange, 302-raised sealing ring, 4-mounting ring, 401-vent, 402-positioning boss, 403-installation cavity, 404-limiting ring groove, 5-spacer ring, 6-safety valve, 601-waist nut with hole, 602-vent groove, 603-moving shaft, 604-chassis, 605-sealing cone head, 606-valve body sealing ring, 607-vent hole, 608-sealing compression spring, 609-fixed magnetic ring, 610-moving magnetic ring, 7-mounting seat, 701-straight slide groove, 702-positioning ring groove, 703-positioning ring, 70 4-air nozzle hole, 8-guide positioning rod, 801-lateral sliding rod, 802-roller, 803-vertical transmission rod, 804-sleeve, 805-limit nut, 9-drive plate, 901-limit hole, 902-drive arc groove, 903-air nozzle arc groove, 904-spline, 10-drive rod, 1001-drive head, 1002-threaded segment, 1003-preload spring, 1004-connector, 1005-keyway, 11- Positioning rod, 1101- Positioning hose, 1102- Positioning straight rod, 1103- Scale, 1104- Ventilation pipe, 1105- Leather case, 1106- Snake bone, 1107- Mounting head, 1108- Connecting nozzle, 12- Transmission sealing structure, 1201- High-pressure sealing ring, 1202- Wear-resistant ring, 1203- Outer retaining ring, 1204- Inner contact ring, 1205- Outer sealing ring, 1206- V-type support spring. DETAILED DESCRIPTION

[0078] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0079] The present invention will be described in detail below with reference to the accompanying drawings.

[0080] Example 1

[0081] like Figures 1 to 3 As shown, the pressure-resistant airbag for pipe sealing includes a main body 1, an end cap 2, an annular airbag 3, a mounting ring 4, and a spacer ring 5. In the figure, the main body 1 is a cylindrical structure, with a positioning ring 101 provided at one end. The main body 1 forms a step 102 on the inner side of the positioning ring 101. This structure is easy to process, and the cylinder can be milled using a lathe. The main body 1 is also provided with an axial main ventilation hole 105 and multiple radial ventilation holes 106. The inner ends of the ventilation holes 106 are connected to the main ventilation hole 105, and the outer ends of the ventilation holes 106 are provided with ventilation cavities 107. The top of the inner wall of the ventilation cavity 107 is tapped. The outer end of the main ventilation hole 105 is equipped with a ventilation nozzle 108. The main ventilation hole 105 and the ventilation holes 106 can be drilled. The ventilation nozzle 108 is used to connect to the external air pipe.

[0082] In the figure, the end cap 2 is installed in the threaded hole 104 via the threaded end 201. One or more annular airbags 3 are mounted on the step 102. The two sides of the annular airbags 3 are limited by the positioning ring 101 and the end cap 2. Spacer rings 5 ​​are provided between the multiple annular airbags 3. The inner opening of the annular airbags 3 is provided with a 180° rotating flange 301. The outer side of the annular airbags 3 is provided with a raised sealing ring 302 for contacting and sealing the pipe wall. The mounting ring 4 is mounted on the step 102 and is located inside the annular airbag 3. The mounting ring 4 is used to support and seal the annular airbag 3. A vent 401 is provided on the surface of the mounting ring 4. The vent 401 is located above the vent cavity 107. A positioning boss 402 is provided in the middle of the inner wall of the mounting ring 4. The steps on both sides of the positioning boss 402 form an installation cavity 403 for installing the annular airbag 3. A limiting ring groove 404 is provided at the bottom of the installation cavity 403. The limiting ring groove 404 is used to install the 180° rotating flange 301 of the annular airbag 3.

[0083] In this embodiment, the number of airbags in the annular airbag 3 is two. In actual application, the number can be three or four. The annular airbag 3 is made of high-grade aromatic polyamide fiber reinforced rubber. When subjected to axial extrusion force, the 180° rotating flange 301 can be in close contact and sealed with the mounting ring 4 serving as the supporting structure. This structure can realize the disassembly and assembly of the annular airbag 3 using the end cover 2.

[0084] It should be noted that the sealing connection between the annular airbag and the internal mounting ring utilizes a 180° folded flange, which increases the contact surface and friction, significantly improving sealing performance. Compared to traditional 90° folding solutions, this significantly increases the internal pressure of the airbag seal, resolving the technical issue of increased internal pipe pressure narrowing the cross-section of the rubber airbag end face, which can easily cause the rubber airbag to fall off or leak and fail. Furthermore, multiple raised sealing rings are symmetrically arranged on the exterior of the annular airbag, increasing friction between the outer wall of the airbag and the pipe wall.

[0085] Example 2

[0086] like Figures 4 to 11As shown, a safety valve 6 is also installed on the internal thread surface of the ventilation cavity 107. The safety valve 6 is used to close the corresponding ventilation hole 106 when the annular airbag 3 is damaged. In the figure, the safety valve 6 includes a waist-shaped nut 601 with a hole, a ventilation groove 602, a movable shaft 603, a chassis 604, a sealing cone head 605, a valve body sealing ring 606, a ventilation hole 607, a sealing compression spring 608, a fixed magnetic ring 609 and a moving magnetic ring 610, wherein: the waist-shaped nut 601 with a hole is installed in the ventilation cavity 107, and a ventilation groove 602 is formed between the waist of the waist-shaped nut 601 with a hole and the inner wall of the ventilation cavity 107; the movable shaft 603 is movably installed in the middle hole of the waist-shaped nut 601 with a hole, and the outer end of the movable shaft 603 does not protrude from the middle hole to avoid affecting the installation of the mounting ring 4, and the chassis 604 is arranged at the bottom of the movable shaft 603, and a clearance fit is adopted between the chassis 604 and the ventilation cavity 107, and the clearance is 0.20mm to 1.5 0mm, a very small movable gap is set to prevent a large amount of gas or liquid from passing through it, a sealing cone head 605 is set on the lower side of the chassis 604, and the size of the sealing cone head 605 is consistent with the size of the ventilation hole 106, and a valve body sealing ring 606 is mounted on the sealing cone head 605; the valve body sealing ring 606 fits tightly with the chassis 604 and is consistent in size, and a plurality of ventilation holes 607 are symmetrically opened around the valve body sealing ring 606 and the chassis 604. In the figure, the number of ventilation holes 607 is 8, and a sealing compression spring 608 is installed between the chassis 604 and the waist-shaped nut 601 with a hole; the fixed magnetic ring 609 is mounted on the movable shaft 603 and is fixedly connected to the waist-shaped nut 601 with a hole; the moving magnetic ring 610 is mounted on the movable shaft 603 and is fixedly connected to the chassis 604.

[0087] The working process is as follows: when there is no external force, the fixed magnetic ring 609 and the moving magnetic ring 610 attract each other, the magnetic attraction force is greater than the elastic force of the sealing compression spring 608, and the sealing cone head 605 is away from the ventilation hole 106. Figure 5 When the pressure in the vent 401 suddenly increases, the high-pressure liquid or gas cannot pass through the vent hole 607 in large quantities. At this time, the force on the side of the chassis 604 close to the vent groove 602 increases. When the sum of the external pressure and the elastic force of the sealing compression spring 608 is greater than the magnetic attraction, the fixed magnetic ring 609 and the moving magnetic ring 610 separate from each other, and the sealing cone 605 enters the vent hole 106 and cooperates with the valve body sealing ring 606 to complete the blocking of the vent hole 106. Figure 9 When the initial position needs to be restored, it is only necessary to increase the pressure of the main ventilation hole 105. At this time, the force on the side of the chassis 604 close to the ventilation hole 106 increases. When the sum of the inner pressure and the magnetic attraction force is greater than the elastic force of the sealing compression spring 608, the fixed magnetic ring 609 and the moving magnetic ring 610 attract each other, and the sealing cone head 605 moves away from the ventilation hole 106. Figure 10 As shown. Figure 11As shown, there are two safety valves 6 arranged above and below. When the annular airbag 3 at the bottom is damaged, high-pressure gas or liquid quickly enters the inside of the annular airbag 3 at the bottom. At this time, the safety valve 6 at the bottom is triggered, and the ventilation hole 106 at the bottom is closed. The annular airbag 3 at the top can continue to work and implement the sealing operation. The dimensions of the sealing cone head 605, the ventilation groove 602, the sealing compression spring 608, the ventilation hole 607, etc. should be specifically designed based on the above working principle.

[0088] Example 3

[0089] like Figures 12 to 15 As shown, the end cap 2 is provided with an end hole 202 along the axial direction, and the main body 1 is provided with a center hole 103 along the axis, with a threaded hole 104 provided at the end of the center hole 103. In the figure, the outer ends of the positioning ring 101 and the outer ends of the end cap 2 are both machined with mounting seats 7, which include multiple radially arranged and symmetrically arranged straight slide grooves 701; the guide positioning rods 8 are movably mounted in the straight slide grooves 701; the outer ends of the mounting seats 7 are provided with drive disks 9, and the rotation of the drive disks 9 can drive the multiple guide positioning rods 8 on the same plane to extend and retract synchronously; the drive rods 10 sequentially pass through the center of the top drive disk 9, the center of the top positioning cover, the center hole 103 of the main body 1, the end hole 202 of the end cap 2, the center of the bottom positioning cover, and the center of the bottom drive disk 9. By rotating the drive rods 10, the drive disks 9 at both ends can be synchronously driven to rotate.

[0090] Specifically, the outer edge of the mounting seat 7 is provided with a positioning ring groove 702, on which a positioning ring 703 is mounted. The top of the positioning ring 703 is flush with the top of the mounting seat 7. The positioning ring 703 is used to prevent the guide positioning rod 8 from falling off. The mounting seat 7 also has a nozzle hole 704 for connecting to the vent nozzle 108. It should be noted that the positioning ring groove 702 is not a necessary technical feature and can be replaced by a preload spring 1003.

[0091] Specifically, the guide positioning rod 8 includes a transverse sliding rod 801, a roller 802, a vertical transmission rod 803, a sleeve 804 and a limit nut 805, wherein: the outer end of the transverse sliding rod 801 is installed with a roller 802, the inner end of the transverse sliding rod 801 is connected to the vertical transmission rod 803, and the transverse sliding rod 801 and the vertical transmission rod 803 constitute an L-shaped sliding rod; the top of the vertical transmission rod 803 is covered with a sleeve 804, and the end of the vertical transmission rod 803 is installed with a limit nut 805. In the figure, four guide positioning rods 8 are included, which are spaced 90° apart. The height of the straight sliding groove 701 is greater than the shaft diameter of the L-shaped sliding rod. At this time, the L-shaped sliding rod can only move forward and backward and cannot rotate.

[0092] Specifically, a limiting hole 901 is provided in the middle of the driving disk 9, and three or four driving arc grooves 902 are symmetrically provided on the driving disk 9. The driving arc groove 902 is mounted on the sliding sleeve 804 and is positioned by the limiting nut 805. The driving disk 9 is also provided with an air nozzle arc groove 903 for installing the inflation nozzle 1043, wherein: during the process of the driving disk 9 rotating at a uniform speed of 35° to 55°, the sliding sleeve 804 and the vertical transmission rod 803 also move from the bottom end to the top end, and the envelope line of the projection of the outer contour of the sliding sleeve 804 on the driving disk 9 forms the inner contour of the driving arc groove 902; the air nozzle arc groove 903 is arranged concentrically with the driving disk 9.

[0093] Specifically, a spline 904 is provided on the flange of the limiting hole 901 of the drive disk 9, which engages with a keyway 1005 on the drive rod 10. A drive head 1001 is mounted at the end of the drive rod 10, and threaded sections 1002 are provided at both ends of the drive rod 10. A preload spring 1003 is provided between the drive head 1001 and the top of the drive disk 9. In this embodiment, both ends of the center hole 103 are tapped.

[0094] During actual operation, first, according to the diameter of the pipe to be blocked, rotate the drive rod to adjust the extension length of the guide positioning rod to ensure that the rollers 802 on all sides can closely contact the pipe wall. Afterwards, use the traction device or drive rod to send the airbag to the specified position in the pipe. The front and rear ends of the airbag are equipped with guide positioning structures, and rollers are provided at both ends of the airbag to facilitate the airbag to enter the specified position in the pipe under the guidance of the positioning rod. Since the length of the guide positioning rod is adjustable, the axis of the airbag can be kept as straight as possible and consistent with the axis of the pipe in pipes of different diameters, solving the technical problems of overall tilt and uneven force of the airbag caused by existing wire rope traction. At this time, when the airbag is expanded for blocking, its axis is stable and not deflected, which can ensure that the contact surface between the airbag and the inner wall of the pipe is symmetrical and evenly stressed, thereby improving the overall pressure-bearing capacity and avoiding the occurrence of stress concentration points on the outer contour of the end.

[0095] Example 4

[0096] like Figure 16 and Figure 17 As shown, the device also includes a positioning rod 11 connected to the driving rod 10. Positioning rod 11 is divided into a positioning hose 1101 and a positioning straight rod 1102. Positioning rod 11 is provided with a scale 1103, and a vent tube 1104 is arranged inside the scale 1103. Specifically, the end of positioning rod 11 is connected to the connecting head 1004 of the driving head 1001 via a mounting head 1107. Mounting head 1107 is provided with a connecting nozzle 1108. Ventilation tube 1104 is connected to the vent nozzle 108 via the connecting nozzle 1108 and an external hose. Positioning hose 1101 is composed of a leather sheath 1105 and a snake 1106 of the leather sheath 1105.

[0097] It should be noted that a technical solution can also be employed in which the end of a positioning rod 1102 is combined with a positioning hose 1101. Using a holster 1105 and a snake 1106, the airbag can be delivered into a curved pipe. Furthermore, a scale 1103 can easily indicate the depth of penetration into the pipe. The end of the positioning rod 1102 can be manually inserted, and after insertion, a stopper device, such as a stopper seat or stopper flange, can be installed at its end to increase the overall sealing force of the airbag.

[0098] Example 5

[0099] like Figures 18 to 21 As shown, a transmission sealing structure 12 is sleeved on the middle part of the driving rod 10. The transmission sealing structure 12 is used to dynamically seal the gap between the driving rod 10 and the center hole 103. The transmission sealing structure 12 includes two structures:

[0100] Structure 1: The transmission sealing structure 12 includes two high-pressure sealing rings 1201, which are relatively arranged in the sealing groove of the driving rod 10. Figure 18 As shown, the lips of the high-pressure sealing ring 1201 face the outer ends respectively.

[0101] Structure 2: The transmission sealing structure 12 includes two high-pressure sealing rings 1201 and three wear-resistant rings 1202. The two high-pressure sealing rings 1201 are respectively arranged between the three wear-resistant rings 1202. Figure 19 As shown, the high-pressure sealing ring 1201 includes an outer retaining ring 1203, an inner contact ring 1204, an outer sealing ring 1205 and a V-shaped support spring 1206, wherein: the inner contact ring 1204 is tightly fitted on the sealing groove of the drive rod 10, one end of the inner contact ring 1204 is tilted and tilted to form the outer retaining ring 1203, the outer retaining ring 1203 is used to block dust and large particles of debris, the other end of the inner contact ring 1204 extends upward to form the outer sealing ring 1205, a V-shaped support spring 1206 is installed inside the outer sealing ring 1205, the inner contact ring 1204 and the outer retaining ring 1203 are at the same height, the horizontal angle β of the outer retaining ring 1203 ranges from 60° to 85°, the middle angle α of the outer sealing ring 1205 ranges from 25° to 40°, and the outer retaining ring 1203 and the outer sealing ring 1205 can both achieve self-sealing under pressure.

[0102] Specifically, the wear-resistant ring is made of nylon material, which is not only highly wear-resistant but also has a certain lubricating effect. The layout of three wear-resistant rings 1202 can effectively solve the problem of sealing axis positioning and avoid eccentricity of the high-pressure sealing ring 1201. In the figure, the outer retaining ring 1203 and the outer sealing ring 1205 both generate an upward component force under pressure to achieve sealing between the lip and the inner wall of the center hole. This solution can solve the problem of gas and liquid leakage between the drive rod and the center hole of the main body.

[0103] 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 various embodiments of the present invention.

Claims

1. A pressure-bearing sealing airbag for a pipeline, characterized in that: It comprises a main body (1), an end cover (2), an annular air bag (3), a mounting ring (4), a spacer ring (5), a safety valve (6), a mounting seat (7), a guide positioning rod (8), a driving disc (9) and a driving rod (10), wherein: The main body (1) is a cylindrical structure, one end of the main body (1) is provided with a positioning ring platform (101), the main body (1) forms a step (102) on the inner side of the positioning ring platform (101), the main body (1) is provided with a center hole (103) along the axis, the end of the center hole (103) is provided with a threaded hole (104), the main body (1) is further provided with an axial ventilation main hole (105) and a plurality of radial ventilation sub-holes (106), the inner end of the ventilation sub-hole (106) is connected to the ventilation main hole (105), the outer end of the ventilation sub-hole (106) is provided with a ventilation cavity (107), the top end of the inner wall of the ventilation cavity (107) is tapped, and the outer end of the ventilation main hole (105) is provided with a ventilation nozzle (108); The end cover (2) is installed in the threaded hole (104) via a threaded end (201), and the end cover (2) is provided with an end hole (202) along the axial direction; One or more of the annular airbags (3) are mounted on the step (102), and both sides of the annular airbag (3) are limited by the positioning ring platform (101) and the end cover (2). A spacer ring (5) is provided between the multiple annular airbags (3). A 180° rotating flange (301) is provided at the inner opening of the annular airbag (3), and a raised sealing ring (302) for contacting and sealing the pipe wall is provided on the outer side of the annular airbag (3); The mounting ring (4) is sleeved on the step (102) and is located inside the annular airbag (3). The mounting ring (4) is used to support and seal the annular airbag (3). A vent (401) is provided on the surface of the mounting ring (4). The vent (401) is located above the vent cavity (107). A positioning boss (402) is provided in the middle of the inner wall of the mounting ring (4). Steps on both sides of the positioning boss (402) form an installation cavity (403) for installing the annular airbag (3). A limiting ring groove (404) is provided at the bottom of the installation cavity (403). The limiting ring groove (404) is used to install the 180° rotating flange (301) of the annular airbag (3). The safety valve (6) is installed in the ventilation cavity (107) and is used to close the corresponding ventilation hole (106) when the annular airbag (3) is damaged; The outer ends of the positioning ring stage (101) and the end cover (2) are both machined to have mounting seats (7), and the mounting seats (7) include a plurality of radially arranged and symmetrically arranged straight slide grooves (701); The guide positioning rod (8) is movably mounted in the straight slide groove (701); A driving disk (9) is provided at the outer end of the mounting seat (7), and the rotational movement of the driving disk (9) can drive a plurality of guide positioning rods (8) on the same plane to extend and retract synchronously; The driving rod (10) sequentially passes through the center of the top driving disk (9), the center of the top positioning cover, the center hole (103) of the main body (1), the end hole (202) of the end cover (2), the center of the bottom positioning cover and the center of the bottom driving disk (9), and the driving disks (9) at both ends can be synchronously driven to rotate by rotating the driving rod (10); The safety valve (6) comprises a waist-shaped nut with a hole (601), a vent groove (602), a movable shaft (603), a base plate (604), a sealing cone head (605), a valve body sealing ring (606), a vent hole (607), a sealing compression spring (608), a fixed magnetic ring (609) and a moving magnetic ring (610), wherein: The waist-shaped nut with a hole (601) is installed in the ventilation cavity (107), and the ventilation groove (602) is formed between the waist of the waist-shaped nut with a hole (601) and the inner wall of the ventilation cavity (107); The movable shaft (603) is movably mounted in the middle hole of the waist-shaped nut (601) with a hole; The chassis (604) is arranged at the bottom of the movable shaft (603), and a clearance fit is adopted between the chassis (604) and the ventilation cavity (107), with the clearance being 0.20 mm to 1.50 mm; The sealing cone head (605) is arranged on the lower side of the chassis (604), the size of the sealing cone head (605) is consistent with the size of the ventilation hole (106), and the sealing cone head (605) is provided with a valve body sealing ring (606); The valve body sealing ring (606) and the bottom plate (604) are tightly fitted and have the same size. A plurality of vent holes (607) are symmetrically provided around the valve body sealing ring (606) and the bottom plate (604). The sealing compression spring (608) is installed between the chassis (604) and the waist-shaped nut (601) with a hole; The fixed magnetic ring (609) is sleeved on the movable shaft (603) and fixedly connected to the waist-shaped nut (601) with a hole; The dynamic magnetic ring (610) is sleeved on the movable shaft (603) and fixedly connected to the chassis (604); When no external force is applied, the fixed magnetic ring (609) and the moving magnetic ring (610) attract each other, the magnetic attraction force is greater than the elastic force of the sealing compression spring (608), and the sealing cone head (605) is away from the ventilation hole (106); When the pressure in the vent (401) increases, the force on the side of the chassis (604) close to the vent groove (602) increases. When the sum of the external pressure and the elastic force of the sealing compression spring (608) is greater than the magnetic attraction force, the fixed magnetic ring (609) and the moving magnetic ring (610) separate from each other, and the sealing cone head (605) enters the vent hole (106) and cooperates with the valve body sealing ring (606) to complete the sealing of the vent hole (106).

2. The pressure-bearing sealing airbag for pipelines according to claim 1, characterized in that: A positioning ring groove (702) is provided on the outer edge of the mounting seat (7), and a positioning ring (703) is installed on the positioning ring groove (702). The top of the positioning ring (703) is flush with the top of the mounting seat (7). The positioning ring (703) is used to prevent the guide positioning rod (8) from falling off. The mounting seat (7) is also provided with an air nozzle hole (704) for connecting the ventilation nozzle (108).

3. The pressure-bearing sealing airbag for pipelines according to claim 1, characterized in that: The guide positioning rod (8) comprises a transverse sliding rod (801), a roller (802), a vertical transmission rod (803), a sliding sleeve (804) and a limiting nut (805), wherein: the outer end of the transverse sliding rod (801) is mounted with the roller (802), the inner end of the transverse sliding rod (801) is connected with the vertical transmission rod (803), and the transverse sliding rod (801) and the vertical transmission rod (803) form an L-shaped sliding rod; the top of the vertical transmission rod (803) is sleeved with the sliding sleeve (804), and the end of the vertical transmission rod (803) is mounted with the limiting nut (805).

4. The pressure-bearing sealing airbag for pipelines according to claim 1, characterized in that: A limiting hole (901) is provided in the middle of the driving disk (9), and three or four driving arc grooves (902) are symmetrically provided on the driving disk (9). The driving arc grooves (902) are sleeved on the sliding sleeve (804) and positioned by the limiting nut (805). The driving disk (9) is also provided with an air nozzle arc groove (903) for installing an air nozzle (1043), wherein: During the process of the driving disk (9) rotating at a constant speed of 35° to 55°, the sliding sleeve (804) and the vertical transmission rod (803) also move from the bottom end to the top end, and the envelope of the projection of the outer contour of the sliding sleeve (804) on the driving disk (9) forms the inner contour of the driving arc groove (902); The air nozzle arc groove (903) is arranged concentrically with the driving disc (9).

5. The pressure-bearing sealing airbag for pipelines according to claim 1, characterized in that: A spline (904) is provided on the flange of the limiting hole (901) of the driving disk (9), and the spline (904) cooperates with the keyway (1005) on the driving rod (10) for transmission.

6. The pressure-bearing sealing airbag for pipelines according to claim 1, characterized in that: A driving head (1001) is installed at the end of the driving rod (10), threaded sections (1002) are provided at both ends of the driving rod (10), and a preload spring (1003) is provided between the driving head (1001) and the driving disc (9) at the top.

7. The pressure-bearing sealing airbag for pipelines according to claim 1, characterized in that: It also includes a positioning rod (11), which is divided into a positioning hose (1101) and a positioning straight rod (1102), wherein: The positioning rod (11) is provided with a scale (1103), and a vent pipe (1104) is arranged inside the positioning rod (11); The end of the positioning rod (11) is connected to the connecting head (1004) of the driving head (1001) via the mounting head (1107); a connecting nozzle (1108) is provided on the mounting head (1107); and the vent pipe (1104) is connected to the vent nozzle (108) via the connecting nozzle (1108) and an external hose. The positioning hose (1101) is composed of a leather cover (1105) and a snake bone (1106) of the leather cover (1105).

8. The pressure-bearing sealing airbag for pipelines according to claim 1, characterized in that: A transmission sealing structure (12) is sleeved on the middle portion of the driving rod (10). The transmission sealing structure (12) is used to dynamically seal the gap between the driving rod (10) and the center hole (103). The transmission sealing structure (12) includes two structures: Structure 1: The transmission sealing structure (12) includes two high-pressure sealing rings (1201), and the two high-pressure sealing rings (1201) are arranged relative to each other in the sealing groove of the driving rod (10); Structure 2: The transmission sealing structure (12) comprises two high-pressure sealing rings (1201) and three wear-resistant rings (1202), wherein the two high-pressure sealing rings (1201) are respectively arranged between the three wear-resistant rings (1202).

9. The pressure-bearing sealing airbag for pipelines according to claim 8, characterized in that: The high-pressure sealing ring (1201) comprises an outer retaining ring (1203), an inner contact ring (1204), an outer sealing ring (1205) and a V-shaped support spring (1206), wherein: The inner contact ring (1204) is tightly fitted on the sealing groove of the driving rod (10), one end of the inner contact ring (1204) is tilted and tilted to form an outer retaining ring (1203), the outer retaining ring (1203) is used to block dust and large particles of debris, the other end of the inner contact ring (1204) extends upward to form an outer sealing ring (1205), a V-shaped support spring (1206) is installed inside the outer sealing ring (1205), the inner contact ring (1204) and the outer retaining ring (1203) are of the same height, the horizontal angle β of the outer retaining ring (1203) ranges from 60° to 85°, the middle angle α of the outer sealing ring (1205) ranges from 25° to 40°, and both the outer retaining ring (1203) and the outer sealing ring (1205) can achieve self-sealing under pressure.

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