A sealing device for a drain pipe

Abstract

The utility model relates to the field of pipeline maintenance, concretely relates to a plugging equipment of drainage pipeline, include: gasbag subassembly and the gas valve that connects at its one end, gasbag subassembly includes gasbag main part and sets up in its inboard and with the sealed joint of gas valve inflatable hose, the outer circular surface middle area of gasbag main part is sealed and fits together department, the both sides of sealed and fits together department are separately interval and are equipped with a plurality of annular cavities, form the wear -resisting antiskid part between two adjacent annular cavities, the annular cavity is sealed and connected with annular reinforcing gasbag respectively. The utility model through annular reinforcing gasbag enhances partial close -fitting density, promotes the friction resistance with the inner wall of pipeline, in addition, wear -resisting antiskid part integral forming and as the interval support structure between annular reinforcing gasbag, resist the scouring abrasion of silt, impurity in water flow, annular support gasbag provides rigid support from inboard for annular reinforcing gasbag, avoids its and produces excessive radial deformation or collapse under water flow impact.

Description

Technical Field

[0001] This utility model relates to the field of pipeline maintenance, and in particular to a sealing device for drainage pipelines. Background Technology

[0002] Drainage pipe sealing equipment is a temporary or emergency sealing device specifically designed for drainage pipes, including municipal rainwater / sewage pipes, industrial wastewater pipes, and civil drainage branch pipes. Also known as drainage pipe sealing airbags, its core function is to use mechanical structure compression and flexible element expansion to form a tight seal between the sealing component and the inner wall of the pipe, temporarily blocking the flow of water, debris, or harmful gases in the pipe. This creates a waterless / low-water working environment for pipeline repair, maintenance, inspection, and renovation.

[0003] Regarding the aforementioned technologies, the inventors discovered that airbags, through inflation, form a temporary sealing barrier within the pipe, isolating the section to be repaired from the external environment. However, due to the complex water flow conditions within drainage pipes, including continuous impacts from high-velocity water flow and pulse flows generated by pump start-up / shutdown and valve switching, existing airbags are mostly single-cavity structures with limited frictional resistance to the pipe wall. Under the impact of water flow, they are prone to axial displacement along the pipe. Furthermore, due to asymmetrical water flow impacts or initial installation deviations, airbags are susceptible to deformation problems such as radial eccentric protrusions and localized collapses. On one hand, deformation leads to uneven sealing surface contact and insufficient sealing pressure in some areas, creating new leakage channels. On the other hand, the eccentric structure further alters the impact force of water flow on the airbag, exacerbating its movement and wear, creating a vicious cycle of "deformation-leakage-displacement," severely impacting the safety and stability of the sealing operation. Utility Model Content

[0004] The main technical problem solved by this utility model is to provide a sealing device for drainage pipes, which can improve the structural strength of the airbag, prevent it from being displaced by the impact of water flow when installed in the pipe, and prevent it from eccentric protrusion and local collapse.

[0005] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: a sealing device for a drainage pipe is provided, comprising: an airbag assembly and a gas valve connected to one end thereof, wherein the airbag assembly comprises an airbag body and an inflatable hose disposed on its inner side and sealed to the gas valve, and the middle area of ​​the outer circular surface of the airbag body is a sealing and fitting part; Several annular cavities are spaced apart on both sides of the sealing and fitting part, and a wear-resistant and anti-slip part is formed between two adjacent annular cavities. An annular reinforcing airbag is sealed and connected in the annular cavity. The inner side of the airbag body is fixedly connected along the axial direction with annular support airbags that correspond to and are coaxially arranged with the annular reinforcing airbags. There are at least two connecting pipes that are sealed between the annular support airbags and the corresponding annular reinforcing airbags. The outer peripheral wall of the inflatable hose is sealed with several diverter tubes at intervals along its length. One end of each diverter tube extends into the interior of the corresponding annular support airbag and is sealed and connected to the inner cavity of the annular support airbag. The end of the inflatable hose away from the gas valve is connected to the inner cavity of the airbag body.

[0006] By adopting the above technical solution, the airbag assembly serves as the core execution unit for sealing, the gas valve controls the opening and closing of the inflation passage and regulates the pressure, the inflation hose serves as the gas transmission carrier, and the three are sealed together to form a closed inflation circuit; the gas valve can accurately control the inflation pressure to avoid over-inflation leading to airbag rupture or under-inflation leading to sealing failure.

[0007] The flat structure of the sealing and fitting part maximizes the contact area, ensuring a fully fitted main sealing surface with the inner wall of the pipe, counteracting the seepage force generated by the water pressure inside the pipe. Simultaneously, the annular cavity provides installation and positioning space for the annular reinforcing airbag. After inflation, the annular reinforcing airbag forms an independent annular auxiliary sealing band, forming a composite sealing structure with the middle sealing and fitting part, consisting of the main seal and multiple auxiliary seals on both sides. The annular reinforcing airbag enhances the local fit tightness and increases the frictional resistance with the inner wall of the pipe. Furthermore, the wear-resistant and anti-slip part is integrally molded, with a textured surface design to increase the coefficient of friction and serving as a support structure between the annular reinforcing airbags, resisting erosion and wear from silt and impurities in the water flow. The annular support airbag provides rigid support to the annular reinforcing airbag from the inside, preventing excessive radial deformation or collapse due to water flow impact. The connecting pipe enables gas communication between the annular support airbag and the annular reinforcing airbag, ensuring synchronous inflation of both. The depressurization system, with at least two separate systems, prevents inflation failure caused by blockage of a single inflatable tube. The diverter tube distributes the gas, allowing it to be simultaneously delivered to the annular support airbag and the inner cavity of the airbag body through the inflation hose, forming a synchronous inflation circuit.

[0008] In a preferred embodiment, the present invention can be further configured such that: the surface of the annular reinforcing airbag has a plurality of elastic adhesive sheets arranged in annular array, and two adjacent elastic adhesive sheets in the circumferential direction are staggered, and one end of each elastic adhesive sheet is connected to the wear-resistant and anti-slip part.

[0009] By adopting the above technical solution, the elastic bonding sheet forms a rigid and elastic composite connection structure between the annular reinforcing airbag and the wear-resistant and anti-slip part, avoiding relative displacement between the two under the impact of water flow and friction of impurities. This ensures the sealing and anchoring of the annular reinforcing airbag and the functional synergy of the wear-resistant and anti-slip part. In addition, the staggered arrangement design allows the elastic bonding sheet to form multi-point elastic contact with the inner wall of the pipe. Combined with the anti-slip texture of the wear-resistant and anti-slip part, a dual anti-slip system of rigid anti-slip surface and elastic anti-slip points is constructed, further increasing the frictional resistance between the airbag assembly and the inner wall of the pipe.

[0010] In a preferred embodiment, the present invention can be further configured such that at least one rubber handle is provided at each end of the airbag assembly.

[0011] By adopting the above technical solution, a clear gripping point is provided for the installation, disassembly and position adjustment of the airbag assembly in the pipeline, which solves the problem of difficulty in accurately controlling the airbag in the narrow space and water flow interference in the drainage pipeline. Manual or mechanical traction can be achieved without additional auxiliary tools. By applying force in coordination with the handles at both ends, the airbag assembly can be quickly placed in the center of the preset sealing position, avoiding the displacement of the sealing fit part and uneven force on the annular reinforcing airbag caused by the initial installation deviation.

[0012] In a preferred embodiment, the present invention can be further configured such that both ends of the airbag assembly are conical.

[0013] By adopting the above technical solution, the conical end face can change the direction of water flow impact, allowing the water flow on the upstream face to flow smoothly around the conical generatrix, avoiding the blunt body impact formed by the traditional flat end structure, greatly reducing the direct impact force of water flow on the end of the airbag, and reducing the generation of eddies in the wake region, avoiding local pressure fluctuations and vibrations caused by eddies. In addition, the conical tip can act as a guide head, automatically adapting to the pipe axis when the airbag assembly is sent into the pipe. Especially when the pipe has slight bends, misaligned interfaces, or impurities attached to the inner wall, it can reduce jamming and scraping, and achieve unobstructed push-in; at the same time, it is convenient for the airbag assembly to adjust its axial position in narrow pipes.

[0014] In a preferred embodiment, the present invention can be further configured such that one end of the inflation hose extends to the inner end of the airbag body away from the gas valve.

[0015] By adopting the above technical solution, high-pressure gas is simultaneously injected into the inner cavity from both ends and the middle of the airbag body, solving the expansion lag problem of the proximal end expanding first and the distal end expanding later in the airbag body with a large length-to-diameter ratio. This ensures synchronous expansion along the entire axial length, and the gas can quickly fill the inner cavity of the airbag body by entering from multiple points at both ends and the middle, avoiding the pressure gradient caused by the long gas transmission path, which results in high pressure at the proximal end and low pressure at the distal end, and maintaining consistent pressure throughout the airbag body. At the same time, during the pressure holding phase, the distal vent can replenish a small amount of leaked gas in real time, ensuring pressure stability.

[0016] In summary, the present invention includes at least one of the following beneficial technical effects of a drainage pipe sealing device: The air is simultaneously supplied to the annular support airbag and the inner cavity of the airbag body through the inflation hose, forming a synchronous inflation circuit. This allows the annular support airbag and the annular reinforcing airbag to expand synchronously, ensuring consistent pressure on the auxiliary sealing strip. At this time, the sealing and fitting part in the middle of the airbag body is inflated and fits tightly against the inner wall of the pipe over a large area. Through elastic deformation, it fills the slight unevenness of the inner wall, forming a core sealing barrier to resist static water pressure. After the annular reinforcing airbags on both sides of the sealing and fitting part are inflated, multiple independent annular sealing strips are formed.

[0017] The annular reinforcing airbags enhance the tightness of the local fit and increase the frictional resistance with the inner wall of the pipe. In addition, the wear-resistant and anti-slip part is integrally molded, and the surface is designed with a textured structure to increase the coefficient of friction. It also serves as a spacer support structure between the annular reinforcing airbags to resist the erosion and wear of mud and impurities in the water flow. The annular support airbags provide rigid support for the annular reinforcing airbags from the inside, preventing them from being subjected to excessive radial deformation or collapse due to water flow impact. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the annular cavity structure of this utility model; Figure 3 for Figure 1 The main view; Figure 4 for Figure 3 Sectional view at point AA.

[0019] In the diagram: 10. Airbag assembly; 2. Gas valve; 3. Elastic adhesive sheet; 4. Rubber handle; 11. Airbag body; 12. Inflation hose; 13. Sealing and fitting part; 14. Annular cavity; 15. Wear-resistant and anti-slip part; 16. Annular reinforced airbag; 17. Annular support airbag; 18. Connecting tube; 19. Diverter tube. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] It should be noted that these figures are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0022] Reference Figure 1-4 This utility model discloses a drainage pipe sealing device, comprising: an airbag assembly 10 and a gas valve 2 connected to one end thereon. The airbag assembly 10 includes an airbag body 11 and an inflatable hose 12 disposed on its inner side and sealed to the gas valve 2. The middle area of ​​the outer circumference of the airbag body 11 is a sealing and fitting part 13. One end of the inflatable hose 12 extends to the inner end of the airbag body 11 away from the gas valve 2. Several annular cavities 14 are spaced apart on both sides of the sealing and fitting part 13. A wear-resistant and anti-slip part 15 is formed between two adjacent annular cavities 14. The annular cavities 14 are respectively sealed and connected to... There is an annular reinforcing airbag 16. Annular support airbags 17, corresponding to and coaxially arranged with the annular reinforcing airbag 16, are fixedly connected to the inner side of the airbag body 11 along the axial direction. There are at least two connecting pipes 18 that are sealed between the annular support airbag 17 and the corresponding annular reinforcing airbag 16. Several diversion pipes 19 are sealed and connected at intervals along the length direction on the outer peripheral wall of the inflation hose 12. One end of each diversion pipe 19 extends into the interior of the corresponding annular support airbag 17 and is sealed and connected to the inner cavity of the annular support airbag 17. The end of the inflation hose 12 away from the gas valve 2 is connected to the inner cavity of the airbag body 11.

[0023] Gas valve 2 is a three-way valve with a valve nozzle body. Gas valve 2 realizes the opening and closing of the inflation passage, pressure regulation and pressure holding control, avoiding over-inflation that may cause the airbag to burst or under-inflation that may cause insufficient sealing pressure. The two are sealed together to form a closed inflation circuit to prevent gas leakage from destroying the sealing state. The airbag body 11 is a flexible sealing substrate, which adopts a composite structure of high elasticity wear-resistant rubber and fiber reinforcement layer, taking into account both elastic deformation capacity and tear resistance. Moreover, the sealing fitting part 13 is designed to maximize the contact area with the inner wall of the pipe. Through elastic deformation, it fills the small concave and convex depressions of the inner wall of the pipe to form the core main sealing surface, which counteracts the water pressure penetration force in the pipe. When gas valve 2 is inflated, the inflation hose 12 extends to the inner side of the far end of the airbag body 11 away from gas valve 2, achieving simultaneous inflation at multiple points: proximal, distal, and central. This ensures rapid filling of the main sealing area and avoids delayed expansion at the distal end. The gas is then delivered to the annular support airbag 17 and the inner cavity of the airbag body 11 via the diversion pipe 19, forming a synchronous inflation circuit between the main airbag and the auxiliary support airbag. Since the annular support airbag 17 and the annular reinforcing airbag 16 are one-to-one and coaxial, they can provide rigid support from the inside, limiting excessive radial deformation of the annular reinforcing airbag 16. The connecting pipe 18 enables gas communication between the two, ensuring synchronous inflation or depressurization and preventing local inflation failure caused by blockage or damage to a single connecting pipe. Furthermore, after inflation, the annular reinforcing airbag 16 evenly adheres to the pipe wall, further preventing eccentric deformation of the airbag and preventing... Local collapse or bulging may occur. In addition, since the annular cavity 14 provides positioning and installation space for the annular reinforcing airbag 16, it can effectively prevent its displacement or deformation. After the annular reinforcing airbag 16 is inflated, it forms an independent annular auxiliary sealing strip, which together with the sealing and fitting part 13 constitutes a composite structure of main seal and double-sided multi-channel auxiliary seal. At the same time, it enhances the local tightness of the fit with the inner wall of the pipe, increases the axial friction resistance, and resists the impact thrust of water flow. The wear-resistant and anti-slip part 15 is made of wear-resistant rubber in one piece, and the surface can also be provided with diamond-shaped anti-slip texture. On the one hand, it increases the friction coefficient between the airbag and the inner wall of the pipe. On the other hand, as the interval support structure of the annular reinforcing airbag 16, it preferentially bears the erosion and wear of impurities such as mud and welding slag in the water flow, avoids the annular reinforcing airbag 16 from directly contacting impurities, and effectively avoids axial movement under pulse flow conditions.

[0024] The surface of the annular reinforcing airbag 16 has a number of elastic adhesive sheets 3 arranged in annular array. Two adjacent elastic adhesive sheets 3 in the circumferential direction are staggered. One end of each elastic adhesive sheet 3 is connected to the wear-resistant and anti-slip part 15.

[0025] The ring array elastic adhesive sheet 3 forms multi-point elastic contact with the inner wall of the pipe, and the staggered arrangement further expands the contact coverage. Combined with the diamond-shaped anti-slip texture of the wear-resistant and anti-slip part 15, it forms a composite anti-slip structure of rigid anti-slip surface and elastic anti-slip points, which greatly increases the frictional resistance between the airbag assembly and the inner wall of the pipe.

[0026] At least one rubber handle 4 is provided at each end of the airbag assembly 10.

[0027] It provides a clear gripping point for the installation and removal of airbags in narrow pipes. By applying force in coordination with the rubber handles 4 at both ends, the airbag assembly 10 can be quickly aligned with the preset sealing position, avoiding the initial installation deviation that causes the sealing and fitting part 13 to shift and the annular reinforcing airbag 16 to be subjected to uneven force.

[0028] The two ends of the airbag assembly 10 are conical.

[0029] The angle between the generatrix of the conical end face and the axis of the airbag body 11 is 30°-45°. The length of the conical transition section is 1 / 3-1 / 2 of the diameter of the airbag body 11. The conical surface smoothly transitions with the outer circular surface of the airbag body 11 and the sealing and fitting part 13, without sharp edges or protrusions. The conical surface is made of the same high-elasticity wear-resistant rubber material as the airbag body 11. Its conical end face changes the direction of water flow impact, so that the water flow on the front side flows smoothly around the generatrix, avoiding the blunt impact of the traditional flat end structure and reducing the direct impact force of the water flow on the end. At the same time, it suppresses the generation of eddies in the wake area, reduces the local pressure fluctuations and airbag vibration caused by eddies. In addition, the conical tip acts as a guide head, which can automatically adapt to the pipe axis, reduce jamming and scraping, and achieve unobstructed push-in. Combined with the traction effect of the rubber handle 4, it reduces the difficulty of installation.

[0030] The implementation principle of this embodiment is as follows: During use, the operator remotely pulls the airbag assembly 10 from the pipe port by using the rubber handles 4 at both ends of the airbag assembly 10 or by connecting the rubber handles 4 with a rope. The conical end guides the equipment to automatically adapt to the pipe axis, preventing jamming or scraping. Then, the airbag assembly 10 is pushed to the preset sealing position. The rubber handles 4 at both ends work together to adjust the axial centering of the equipment, ensuring precise alignment of the sealing part 13 with the section to be sealed, avoiding uneven force on the annular reinforcing airbag 16. Subsequently, the gas valve 2 is opened to inflate the airbag body 11 with the help of external connecting pipes and air pumps. The distribution pipe 19 on the inflation hose 12 precisely distributes the gas to each annular support airbag 17, and then simultaneously delivers it to the corresponding annular reinforcing airbag 16 through at least two connecting pipes 18, achieving synchronous expansion of the annular support airbag 17 and the annular reinforcing airbag 16, ensuring consistent pressure on the auxiliary sealing strip. At this time, after the sealing and fitting part 13 in the middle of the airbag body 11 is inflated, it fits tightly against the inner wall of the pipe over a large area. Through elastic deformation, it fills the slight unevenness of the inner wall, forming a core sealing barrier to resist static water pressure. After the annular reinforcing airbags 16 on both sides of the sealing and fitting part 13 are inflated, they form multiple independent annular sealing bands, which together with the main seal form a main and auxiliary linkage defense line. Even if there is a small leak on the main sealing surface, the auxiliary sealing band can quickly block water flow penetration. The interlaced elastic adhesive sheet 3 on the surface of the annular reinforcing airbag 16 expands and fits against the inner wall of the pipe, filling the small gap between the wear-resistant and anti-slip part 15 and the annular reinforcing airbag 16, the fine cracks and scale gaps in the inner wall of the pipe, and forming a sealing supplement layer again. In addition, the conical structure at both ends of the airbag assembly 10 achieves "gradual fitting", avoiding the annular gap of the traditional flat end. After inflation, the conical surface fills the pipe end interface steps and corrosion pits, eliminating dead angles of end leakage, and further ensuring the sealing performance and operational safety of the operation.

[0031] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A sealing device for a drainage pipe, characterized in that, include: The airbag assembly (10) and the gas valve (2) connected to one end thereto, the airbag assembly (10) includes an airbag body (11) and an inflation hose (12) disposed on its inner side and sealed to the gas valve (2), the middle area of ​​the outer circular surface of the airbag body (11) is a sealing fitting part (13). The sealing and fitting part (13) has several annular cavities (14) spaced apart on both sides, and a wear-resistant and anti-slip part (15) is formed between two adjacent annular cavities (14). Annular reinforcing airbags (16) are sealed and connected in the annular cavities (14). The inner side of the airbag body (11) is fixedly connected with an annular support airbag (17) that corresponds to and is coaxially arranged with the annular reinforcing airbag (16). There are at least two connecting pipes (18) that are sealed between the annular support airbag (17) and the corresponding annular reinforcing airbag (16). The outer peripheral wall of the inflatable hose (12) is sealed with several diverter tubes (19) at intervals along its length. One end of each diverter tube (19) extends into the interior of the corresponding annular support airbag (17) and is sealed and connected to the inner cavity of the annular support airbag (17). The end of the inflatable hose (12) away from the gas valve (2) is connected to the inner cavity of the airbag body (11).

2. The sealing device for a drainage pipe according to claim 1, characterized in that, The surface of the annular reinforcing airbag (16) has a number of elastic adhesive sheets (3) arranged in annular array. Two adjacent elastic adhesive sheets (3) are staggered in the circumferential direction, and one end of each elastic adhesive sheet (3) is connected to the wear-resistant and anti-slip part (15).

3. The sealing device for a drainage pipe according to claim 1, characterized in that, The airbag assembly (10) has at least one rubber handle (4) at each end.

4. The sealing device for a drainage pipe according to claim 1, characterized in that, The two ends of the airbag assembly (10) are conical.

5. A sealing device for a drainage pipe according to claim 1, characterized in that, One end of the inflation hose (12) extends to the inner end of the airbag body (11) away from the gas valve (2).

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