Drainage pipe trenchless repair airbag

Abstract

The present invention relates to the technical field of pipeline repair, and discloses a trenchless repair airbag for drainage pipelines, comprising an inner bag and an outer bag, wherein the outer bag is integrally formed with the inner bag, and a plurality of adjusting components are arranged between the inner bag and the outer bag, and the adjusting component comprises a first air inlet pipe, wherein the first air inlet pipe is used to connect the inner bag and the outer bag, and the inner diameter of the first air inlet pipe increases successively from one side of the inner bag to the side of the outer bag, and an air blocking column is slidably connected inside the first air inlet pipe, and the diameter of one end of the air blocking column is consistent with the inner diameter of the lower end of the first air inlet pipe, and an exhaust groove for air circulation is arranged at the other end of the air blocking column; by adjusting the air intake amount or closing the air intake according to actual conditions under the action of the adjusting component, when the interior of the repaired pipeline is concave, the air intake amount is increased to make the outer bag expand again, so that the repair material fits better, and when the interior of the repaired pipeline is convex, the air intake amount is reduced to prevent excessive air pressure from damaging the outer bag.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline repair, in particular to a trenchless repair airbag for a drainage pipeline. Background Art

[0002] The function of the repair airbag is to push back the small inward collapse of the pipeline to restore the flow capacity of the pipeline. At the same time, the inner wall of the pipeline can be compressed and reinforced with plugging materials. The function of the pipeline plugging airbag is to block the pipeline and prevent water from passing through to facilitate construction and other needs.

[0003] The Chinese patent with publication number CN114658954A discloses an airbag device for trenchless repair of pipelines. The airbag device includes a housing, a repair liner winding mechanism, a directional transmission structure, an inflation and pressurization mechanism, and a coating structure. The directional transmission structure includes two groups of load-bearing rods, a second rotating motor, a sleeve roller fixedly sleeved on one of the groups of load-bearing rods, a sliding sleeve arranged on the remaining group of load-bearing rods, and two groups of limit plates. The coating structure includes two groups of frame plates, four groups of spring parts fixedly connected to the corresponding frame plates, a fixed plate fixedly installed between the four groups of spring parts, a brush roller fixedly installed on the corresponding fixed plate, a feed pipe arranged on the corresponding brush roller, and an adjustment component. The airbag device for trenchless repair of pipelines cannot ensure stable air pressure during inflation, which leads to uneven force when the airbag is inflated, resulting in incomplete fitting.

[0004] Chinese patent publication number CN115264226A discloses a plugging airbag device for trenchless repair of underground pipelines, including a front airbag, which is a cylindrical airbag, a middle connection is provided on the right side of the front airbag, an inflation interface and a valve are provided below the middle connection, a rear airbag is provided on the right side of the middle connection, the rear airbag is a mushroom-shaped airbag, a bracket is provided in the rear airbag similar to an umbrella rib, which can be folded when not in use and opened when in use, an inflation interface and a pull ring are provided on the front airbag, the front airbag and the rear airbag are made of high-quality rubber, and the inflation interface and the pull ring are made of stainless steel metal parts. Although the plugging airbag device for trenchless repair of underground pipelines can play a buffering role when the airbag is damaged, it cannot prevent the airbag from being damaged when squeezed.

[0005] When trenchless repair airbags are in use, most of them use a fan to fill the airbag with gas. Since the air pressure changes when the gas is filled, the airbag and the air inlet will expand first, causing the airbag to expand unevenly and the repair material cannot completely fit the inner wall of the pipe. When the inner wall of the pipe is corroded or dented or bulged due to other external factors, the repair material cannot be filled into the dented area after the airbag is inflated. At the same time, the bulged area will cause the airbag to be damaged due to pressure. Summary of the invention

[0006] The object of the present invention is to provide a trenchless repair airbag for a drainage pipe to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: a drainage pipe trenchless repair airbag, comprising an inner bag and an outer bag, the outer bag and the inner bag are made in one piece, and a plurality of adjustment components are arranged between the inner bag and the outer bag;

[0008] The regulating assembly includes a first air intake pipe, the first air intake pipe is used to connect the inner bag and the outer bag, the inner diameter of the first air intake pipe increases from one side of the inner bag to the side of the outer bag, an air blocking column is slidably connected inside the first air intake pipe, and the diameter of one end of the air blocking column is consistent with the inner diameter of the lower end of the first air intake pipe, and the other end of the air blocking column is provided with an exhaust groove for air circulation;

[0009] The outer bag is located outside the inner bag, and an air intake assembly is arranged inside the inner bag. The air intake assembly includes an air intake ring, and a plurality of air guide tubes arranged in a circle are arranged on the outer surface of the air intake ring, and each air guide tube is crescent-shaped, and a pressure valve is arranged at the other end of each air guide tube;

[0010] The outer bag is provided with a plurality of films inside, the films divide the inner part of the outer bag into a plurality of first cavities, the inner part of the first cavities is provided with an annular air bag, the inner part of the annular air bag is filled with an expansion material, and the expansion material can expand when the temperature rises;

[0011] A rubber disk is provided on the outer surface of the annular air bag, and the rubber disk is fixedly connected to the air blocking column, and a temperature sensor is provided inside each of the first cavities.

[0012] Preferably, an air supply pipe is provided in the inner bag, and the air intake assembly is arranged outside the air supply pipe, and the two are connected with each other. The outer surface of the air supply pipe is provided with a plurality of groups of first through grooves, and each group of first through grooves corresponds to the air intake assembly.

[0013] Preferably, mounting plates are provided at both ends of the inner capsule, gaps are left between the two mounting plates and the inner capsule and the outer capsule, and a plurality of fixing arms are provided on the side faces of the two mounting plates away from each other, and a roller is hinged at the other end of each fixing arm.

[0014] Preferably, each of the mounting plates is provided with a second cavity inside, the inner wall of the second cavity is provided with a plurality of second through grooves, each of the second through grooves is slidably connected with a positioning plate inside, each of the positioning plates has a groove at one end close to each other, and each of the positioning plates is made of rubber at one end away from each other.

[0015] Preferably, the sides of the two second cavities close to each other are connected with an air outlet pipe, the other end of each air outlet pipe is connected with the inner bag, and the sides of the two second cavities away from each other are respectively provided with a pressure relief valve and a second air inlet pipe.

[0016] Technical effects of the present invention:

[0017] 1. The present invention cooperates with the second cavity and the second through groove. When the second cavity is filled with gas, the positioning plate can be extended outward, thereby achieving the purpose of positioning and avoiding shaking during the repair process, which may cause the repair material to break during the shaping process.

[0018] 2. The present invention can stabilize the gas pressure before filling the inner bag with gas through the cooperation between the air supply pipe and the pressure valve, so as to avoid uneven force on the inner bag due to unstable air pressure, resulting in different expansion degrees. Under the drainage of the airway, the gas transmission direction can be changed to avoid excessive air pressure when using a fixed air inlet point.

[0019] 3. Under the action of the regulating component, the present invention adjusts the air intake volume or closes the air intake according to actual conditions. When the interior of the repaired pipe is concave, the air intake volume is increased to make the outer bag expand again, so that the repair material fits better. When the interior of the repaired pipe is convex, the air intake volume is reduced to prevent excessive air pressure from causing damage to the outer bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the front cross-sectional structure of the outer capsule of the present invention;

[0022] Figure 3 It is a schematic diagram of the right side cross-sectional structure of the outer capsule of the present invention;

[0023] Figure 4 This is a schematic diagram of the air supply pipe structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the mounting plate of the present invention;

[0025] Figure 6 This is a schematic diagram of the cross-sectional structure of the mounting plate of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of the annular air bag of the present invention;

[0027] Figure 8 It is a schematic diagram of the cross-sectional structure of the first air intake pipe of the present invention.

[0028] In the figure: 1. inner bag; 2. outer bag; 3. adjustment component; 301. first air inlet pipe; 302. air blocking column; 303. exhaust groove; 4. air inlet component; 401. air inlet ring; 402. air guide pipe; 5. film; 6. first cavity; 7. annular air bag; 8. rubber disc; 9. air supply pipe; 10. first through groove; 11. mounting plate; 12. fixed arm; 13. roller; 14. second cavity; 15. second through groove; 16. positioning plate; 17. air outlet pipe; 18. pressure relief valve; 19. second air inlet pipe. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] First embodiment

[0031] like Figures 1 to 8 As shown, the present embodiment discloses a drainage pipe trenchless repair airbag, comprising an inner bag 1 and an outer bag 2. The outer bag 2 is made of an integral part with the inner bag 1. The integral part makes the two structures tighter, avoids air leakage, and can effectively prevent the overturning during use, which may cause problems in the repaired pipe. A plurality of adjustment components 3 are arranged between the inner bag 1 and the outer bag 2. The adjustment components 3 can make air circulate between the inner bag 1 and the outer bag 2, and adjust the air intake amount or close the air intake according to the actual situation. When the inside of the repaired pipe is concave, In order to make the repair material fit better, the air intake is gradually increased by adjusting component 3, so that the outer bag expands outward again to make it fit better, avoiding gaps between the repair layer and the inner wall of the pipe, which may cause it to fall off. When the inside of the repaired pipe is convex, in order to prevent the outer bag 2 from being squeezed and damaged, the air intake is gradually reduced or even closed by adjusting component 3, thereby reducing the air pressure inside the outer bag 2 and making the surface of the outer bag 2 concave, so that the repair material can fit the convex part of the inner wall of the repaired pipe, avoiding the situation where the repair material is not applied properly.

[0032] The regulating component 3 includes a first air inlet pipe 301, the inner diameter of the first air inlet pipe 301 increases successively along the axial direction, and an air blocking column 302 is slidably connected to the inside of the first air inlet pipe 301, and the diameter of one end of the air blocking column 302 is consistent with the inner diameter of the lower end of the first air inlet pipe 301. When the air blocking column 302 is in the initial position, the outer surface of the lower end of the air blocking column 302 is in close contact with the inner wall of the lower end of the first air inlet pipe 301, so that the lower end of the first air inlet pipe 301 can be sealed by the air blocking column 302. When the air blocking column 302 is gradually moved upward by an external force, a gap is formed between the air blocking column 302 and the first air inlet pipe 301 under the action of the inclined surface, so that gas can circulate, and the greater the rising distance of the air blocking column 302, the greater the air intake amount. An exhaust groove 303 for air circulation is opened at one end of the air blocking column 302, and the exhaust groove 303 can effectively transmit the gas entering the first air inlet pipe 301 to the outer bag 2, thereby achieving the purpose of gas transmission.

[0033] An air supply pipe 9 is provided in the inner bag 1. The air supply pipe 9 is made of a relatively hard material and can consume part of the unstable air pressure just injected with gas, so that the air pressure inside the air supply pipe 9 is relatively stable before being injected into the inner bag 1, thereby avoiding the situation where the air pressure fluctuates and causes uneven force when the inner bag 1 expands. The air intake component 4 is arranged on the outside of the air supply pipe 9, and the two are connected with each other. The air intake component 4 can rotate on the surface of the air supply pipe 9, so that the direction of the air intake is constantly changed, thereby avoiding the situation where the local air pressure is too high. A plurality of groups of first through grooves 10 are provided on the outer surface of the air supply pipe 9, and each group of first through grooves 10 corresponds to the air intake component 4. The air supply pipe 9 and the air intake component 4 are connected through the first through grooves 10, so that the gas can move freely.

[0034] Both ends of the inner bag 1 are provided with mounting plates 11, and gaps are left between the two mounting plates 11 and the inner bag 1 and the outer bag 2 to avoid interference between the inner bag 1 and the outer bag 2 during expansion. A plurality of fixing arms 12 are provided on the side away from each other of the two mounting plates 11, and a roller 13 is hinged at the other end of each fixing arm 12. Through the mutual cooperation of the fixing arms 12 and the rollers 13, the whole can move freely on the pipeline to be repaired, so that it can be smoothly transported to the location to be repaired.

[0035] A second cavity 14 is provided inside each mounting plate 11, and a plurality of second through grooves 15 are provided on the inner wall of the second cavity 14. A positioning plate 16 is slidably connected inside each second through groove 15. When the gas inside the second cavity 14 gradually increases, part of the gas can enter the second through groove 15. Under the action of gas pressure, the positioning plate 16 is gradually extended outward, so that the positioning plate 16 contacts the inside of the pipe to be repaired, so as to achieve the purpose of positioning and avoid shaking during the repair process, which may cause the repair material to break during the shaping process. A groove is provided at one end of each positioning plate 16 that is close to each other, so that the positioning plate 16 is more stable when subjected to force and shake is reduced. The ends of each positioning plate 16 that are far away from each other are rubber Material. When the rubber material is in close contact with the pipe to be repaired, the rubber material can be deformed, so that the friction between the two is increased again, making its fixed position more stable. The two second cavities 14 are connected to each other on the side close to each other with an air outlet pipe 17. Under the action of the air outlet pipe 17, air can circulate. The other end of each air outlet pipe 17 is connected to the inner bag 1. The two second cavities 14 are separated from each other. A pressure relief valve 18 and a second air inlet pipe 19 are respectively provided. The pressure relief valve 18 can be connected to the external pipeline, and can effectively release excess gas to avoid high load. The second air inlet pipe 19 can be connected to the hot air blower, so that air can be continuously supplied to the inner bag 1 through the second air inlet pipe 19.

[0036] The outer bag 2 is located outside the inner bag 1. An air intake assembly 4 is provided inside the inner bag 1. When the air inside the air supply pipe 9 is full of gas, the internal air pressure is relatively stable. Under the action of the air pressure, all the air intake assemblies 4 can be opened, so that the gas can enter the inner bag 1 at a uniform speed, so as to avoid uneven force on the inner bag 1 due to unstable air pressure, resulting in different expansion degrees, and failure to push the repair material on the outside to completely fit the inner wall of the pipe to be repaired. The air intake assembly 4 includes an air intake ring 401. The outer surface of the air intake ring 401 is provided with a plurality of air guide tubes 402 arranged in a circle, and each air guide tube 402 is crescent-shaped. Under the drainage of the air guide tube 402, the transmission direction of the gas can be changed. When the gas is quickly discharged from the air guide tube 402, it can The air intake ring 401 is impacted to a certain extent. With the cooperation of multiple air guide tubes 402, the air intake ring 401 can be rotated, so that the inner bag 1 can be inflated in multiple directions, avoiding the situation where the air pressure is too high when a fixed air intake point is used. A pressure valve is provided at the other end of each air guide tube 402, and the pressure valve can seal the air guide tube 402. When the air pressure inside the air delivery tube 9 is stabilized and then continuously filled with gas, the air pressure increases, which can open the pressure valve to allow the gas to pass through. At the same time, the air pressure is stabilized and then released at the same time, so that the discharged air pressure is relatively stable, avoiding uneven force on the inner bag 1 during inflation, resulting in different expansion degrees, and failure to push the outer repair material to completely fit the inner wall of the pipe to be repaired.

[0037] The interior of the outer bag 2 is provided with a plurality of films 5, and the films 5 divide the interior of the outer bag 2 into a plurality of first cavities 6. Under the action of the first cavity 6, the outer bag 2 can be divided into a plurality of stress areas, and the gas in each area can be changed according to different stress conditions, so that the outer bag 2 can be deformed according to the actual situation, so that the repair material can be more closely fitted to the pipe to be repaired, avoiding the situation where the contact is not in place. The interior of the first cavity 6 is provided with an annular air bag 7, and the interior of the annular air bag 7 is filled with expansion material. When the temperature rises, the expansion material can expand and lift the annular air bag 7 to drive the air blocking column 302 to move upward, thereby achieving the purpose of free movement of the air blocking column 302. The outer surface of the annular air bag 7 is provided with a rubber disk 8, and the rubber disk 8 and the air blocking column 302 are fixedly connected. A temperature sensor is provided inside each first cavity 6. The temperature sensor The temperature inside each first cavity 6 can be detected in real time, and the actual situation inside each first cavity 6 at this time can be judged according to the temperature. The higher the temperature, the more heat there is inside the first cavity 6 at this time, causing the outer bag 2 to gradually expand outward, indicating that a depression has appeared between the outer bag 2 and the inner wall of the pipe to be repaired, so it is necessary to increase the air intake to gradually increase the gas entering the interior, so that the outer bag 2 can fit the depression of the pipe to be repaired to avoid the situation of inadequate fitting. The lower the temperature, the less heat there is inside the first cavity 6 at this time, causing the outer bag 2 to gradually shrink due to external compression, indicating that a bulge has appeared between the outer bag 2 and the inner wall of the pipe to be repaired at this time, so it is necessary to reduce the air intake to gradually reduce the gas entering the interior or even conduct it outward, so that the outer bag 2 can fit the bulge of the pipe to be repaired to avoid the situation of inadequate fitting.

[0038] In actual use, the repair material is firstly wrapped around the surface of the outer bag 2, and then the pressure relief valve 18 and the second air inlet pipe 19 are respectively connected to the external pipe and the hot air blower, and then the device is placed inside the pipe to be repaired, and the device is transported to the damaged position by the roller 13, and then the hot air blower is started to generate normal temperature wind. Under the action of the second air inlet pipe 19, the wind can enter the air supply pipe 9, so that the gas inside the air supply pipe 9 gradually increases, and part of the gas will enter the second cavity 14 along the air outlet pipe 17, so that the gas inside the second cavity 14 gradually increases, and part of the gas enters the second through groove 15. Under the action of air pressure, the positioning plate 16 is gradually extended outward, so that the positioning plate 16 contacts with the inside of the pipe to be repaired, so as to achieve the purpose of positioning, avoid shaking during the repair process, and cause the repair material to break during the shaping process.

[0039] When positioning is completed, the hot air blower continues to supply air, so that the air pressure inside the air supply pipe 9 gradually increases, and multiple pressure valves are opened at the same time, so that the gas can be discharged from the air guide pipe 402 at a uniform speed. Under the guidance of the air guide pipe 402, the transmission direction of the gas can be changed. When the gas is quickly discharged from the air guide pipe 402, it can have a certain impact on the air intake ring 401. Under the mutual cooperation of multiple air guide pipes 402, the air intake ring 401 can be rotated, so that the inner capsule 1 can be inflated in multiple directions to avoid the situation of excessive air pressure when using a fixed air intake point. Under continuous air intake, the inner capsule 1 gradually expands and stretches the outer capsule 2, so that the outer capsule 2 can drive the repair material to contact the inner wall of the pipeline that needs to be repaired, and under the drive of the inner capsule 1, the outer capsule 2 is stretched to a certain extent to avoid uneven force during subsequent air intake. When the air pressure reaches a certain threshold, the pressure relief valve 18 can be opened to transmit the subsequent gas to the outside through the pressure relief valve 18, thereby achieving the purpose of air pressure balance.

[0040] After the initial contact is completed, hot air is filled into the air supply pipe 9 through a hot air blower, and the new hot air will be supplied along the specified route again. Since the air pressure of the hot air is greater than that of the gas at room temperature, the hot air is mixed with the gas at room temperature under continuous injection, and the temperature and pressure are increased by heat exchange. When the pressure reaches a certain threshold, the air blocking column 302 can be pushed to gradually rise. When the air blocking column 302 is gradually moved upward by external force, a gap is formed between the air blocking column 302 and the first air inlet pipe 301 under the action of the inclined surface, so that the high-temperature gas can enter the first air inlet pipe 301, and then enter the first cavity 6 through the exhaust groove 303, so that the outer bag 2 expands to press the repair material. At the same time, since the outer bag 2 is filled with high-temperature gas, the repair material can become viscous, so that the repair material can adhere to the inner wall of the pipe that needs to be repaired.

[0041] When the temperature detected by the temperature sensor is greater than the threshold, the more hot air there is inside the first cavity 6, the outer bag 2 gradually expands outward, indicating that a depression appears between the outer bag 2 and the inner wall of the pipe to be repaired, and it is necessary to increase the air intake to gradually increase the gas entering the interior. Under the action of high temperature, the material inside the annular air bag 7 can continue to expand, and under the squeezing of the annular air bag 7, the air blocking column 302 can be driven to rise again. Due to the effect of the inclined surface, the greater the rising height of the air blocking column 302, the greater the air intake, thereby increasing the gas entering the first cavity 6, so that the outer bag 2 in this area can expand outward again, so that the outer bag 2 will fit the depression of the pipe to be repaired to avoid the situation of inadequate fitting.

[0042] When the temperature detected by the temperature sensor is lower than the threshold, the size of the cavity expansion is related to the air pressure. At this time, the less hot air is inside the first cavity 6, the outer bag 2 is squeezed by the outside world and gradually shrinks, indicating that a bulge appears between the outer bag 2 and the inner wall of the pipe to be repaired, so it is necessary to reduce the air intake to gradually reduce the gas entering the interior or even discharge it outward. Due to the temperature drop, the expansion material shrinks and resets, and at the same time is squeezed by the outside world. With mutual cooperation, part of the gas can be discharged from the exhaust groove 303, so that the air blocking column 302 gradually descends, and the first air intake pipe 301 is sealed to prevent the gas from re-entering the first cavity 6, so that the outer bag 2 can fit the bulge of the pipe to be repaired in this area to avoid the situation of inadequate fitting.

[0043] After a period of time, turn off the hot air blower, open the pressure relief valve 18 completely, and exhaust the internal gas completely, so that the outer bag 2 and the inner bag 1 gradually shrink and reset. At the same time, each positioning plate 16 is reset to release the overall limit, so that the device can be taken out of the pipeline by the roller 13 to prepare for the next repair.

[0044] Second embodiment

[0045] This embodiment discloses a drainage pipe non-excavation repair airbag repair method, and the specific steps are as follows:

[0046] S1. First, use CCTV to detect and determine the damaged position of the pipeline, then wrap the repair material around the surface of the outer bag 2, and then use the roller 13 to pull the repair bag to the damaged position;

[0047] S2, secondly, the inner bag 1 is inflated through the second air inlet pipe 19, and the air is uniformly fed into the inner bag 1 through the rotating air inlet assembly 4, so that the inner bag 1 gradually expands and props up the outer bag 2, so that the outer bag 2 gradually approaches and clings to the inner wall of the pipe to be repaired;

[0048] S3, then fill the inner bag 1 with hot air through the second air inlet pipe 19 to increase the pressure inside the inner bag 1, and introduce the gas into the outer bag 2 through the regulating component 3, so that it expands and fits with most of the inner wall of the pipe, and then adjusts the air intake amount according to the actual situation through the regulating component 3 to avoid contact with the raised part of the inner pipe during expansion, so as to avoid damage to the outer bag 2, so that the outer bag 2 can completely fit with the raised part of the inner wall of the pipe that needs to be repaired;

[0049] S4. Finally, the air pressure of the airbag is released through the pressure relief valve 18, and the airbag is taken out to complete the repair.

[0050] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A drainage pipe trenchless repair airbag, comprising an inner airbag (1) and an outer airbag (2), characterized in that: The outer capsule (2) and the inner capsule (1) are made in one piece, and a plurality of adjustment components (3) are provided between the inner capsule (1) and the outer capsule (2); The regulating component (3) comprises a first air intake pipe (301), the first air intake pipe (301) being used to connect the inner bag (1) and the outer bag (2), the inner diameter of the first air intake pipe (301) increasing from one side of the inner bag (1) to the side of the outer bag (2), an air blocking column (302) being slidably connected inside the first air intake pipe (301), the diameter of one end of the air blocking column (302) being consistent with the inner diameter of the lower end of the first air intake pipe (301), and an exhaust groove (303) for air circulation is provided at the other end of the air blocking column (302); The outer bag (2) is located outside the inner bag (1); an air intake assembly (4) is provided inside the inner bag (1); the air intake assembly (4) comprises an air intake ring (401); a plurality of air guide tubes (402) arranged in a circumference are provided on the outer surface of the air intake ring (401); each air guide tube (402) is crescent-shaped; and a pressure valve is provided at the other end of each air guide tube (402); A plurality of films (5) are provided inside the outer bag (2), and the films (5) divide the interior of the outer bag (2) into a plurality of first cavities (6). An annular air bag (7) is provided inside the first cavities (6). The annular air bag (7) is filled with an expansion material. When the temperature rises, the expansion material can expand. A rubber disk (8) is provided on the outer surface of the annular air bag (7), and the rubber disk (8) and the air blocking column (302) are fixedly connected, and a temperature sensor is provided inside each of the first cavities (6).

2. The drainage pipe trenchless repair airbag according to claim 1 is characterized in that: An air supply pipe (9) is provided inside the inner bag (1), the air intake assembly (4) is arranged outside the air supply pipe (9), and the two are connected in a sleeve manner; a plurality of groups of first through grooves (10) are provided on the outer surface of the air supply pipe (9), and each group of first through grooves (10) corresponds to the air intake assembly (4).

3. The drainage pipe trenchless repair airbag according to claim 1 is characterized in that: Both ends of the inner capsule (1) are provided with mounting plates (11), gaps are left between the two mounting plates (11) and the inner capsule (1) and the outer capsule (2), and a plurality of fixing arms (12) are provided on the side faces of the two mounting plates (11) that are away from each other, and the other end of each fixing arm (12) is hingedly connected to a roller (13).

4. The drainage pipe trenchless repair airbag according to claim 3 is characterized in that: Each of the mounting plates (11) is provided with a second cavity (14) inside, and the inner wall of the second cavity (14) is provided with a plurality of second through slots (15), and each of the second through slots (15) is slidably connected to a positioning plate (16) inside, and each of the positioning plates (16) has a groove at one end close to each other, and each of the positioning plates (16) has a rubber material at one end away from each other.

5. The drainage pipe trenchless repair airbag according to claim 4 is characterized in that: The sides of the two second cavities (14) that are close to each other are both connected to an air outlet pipe (17), and the other end of each air outlet pipe (17) is connected to the inner bag (1). The sides of the two second cavities (14) that are far away from each other are respectively provided with a pressure relief valve (18) and a second air inlet pipe (19).

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