A multilevel dissolvable pipeline occluder

Abstract

The application provides a multilevel soluble pipeline plugging device, which comprises at least a flow blocking part with a closed bottom, a flexible extension is arranged on the side of the flow blocking part, the flexible extension is arranged in multiple along the axial direction of the flow blocking part, and the flow blocking part and the flexible extension are made of soluble material which is soluble in pipeline conveying medium. The application has the beneficial effect of high safety.

Description

TECHNICAL FIELD

[0001] The present application relates to a multi-level soluble pipeline plugging device and a pipeline plugging method thereof. BACKGROUND

[0002] At present, pipelines conveying flammable and explosive substances such as natural gas and oil need to be replaced and repaired after being used for a period of time due to corrosion of the pipelines, and welding and ignition operations are required during replacement and repair. If flammable and explosive substances cannot be effectively isolated during welding and ignition operations, major explosion and combustion accidents may occur. The previous pipeline plugging methods mainly include: (1) butter plugging method, also known as butter wall: this method involves pushing a certain amount of butter into both ends of the pipeline to be repaired to form a butter column to play a plugging and isolation role. The disadvantage is that the operator needs to complete the welding and ignition operation within a short period of time, otherwise the butter will collapse and fail. The butter cannot be removed and will pollute the pipeline. The butter wall cannot withstand pressure, so a large amount of water and nitrogen needs to be used to replace the dangerous gas in the pipeline before construction. (2) rubber ball plugging method, also known as pig ball: this method involves placing an inflatable rubber isolation ball at both ends of the pipeline to be repaired to play a plugging and isolation role together with the butter wall. The isolation ball needs to be removed after the operation is completed. The disadvantage is that the rubber isolation ball must be removed. During the removal process, the rubber isolation ball needs to be damaged. The damaged and detached rubber residues will pollute the pipeline and block the instruments on the pipeline. Because this method also cannot withstand pressure, a large amount of water and nitrogen needs to be used to replace the dangerous gas in the pipeline before construction. (3) freezing plugging method: this method involves filling water in the pipeline to be replaced and using a freezing device to freeze two ice columns in the pipeline to play a plugging role. The disadvantage is that a large amount of preparation work is required before the operation. A large amount of resources needs to be consumed. If the operation is performed in a high-temperature season, a long freezing time is required. In cold regions, the ice columns need a long time to completely melt after the operation is completed, resulting in waste of resources. SUMMARY

[0003] The present application aims to provide a multi-level soluble pipeline plugging device, which comprises at least one flow-blocking part with a closed bottom, a flexible extension is arranged along the side of the flow-blocking part, the flexible extension is arranged in multiple along the axial direction of the flow-blocking part, and the flow-blocking part and the flexible extension are made of a soluble material that can be dissolved in the pipeline conveying medium.

[0004] As a further improvement of the embodiment of the present application, the flexible extension is made of sealant.

[0005] As a further improvement of the embodiment of the present application, the outer surface of the flexible extension is provided with a sealant made of soluble material which is soluble in the pipeline conveying medium.

[0006] As a further improvement of the embodiment of the present application, the sealant is provided in the form of a ring around the side surface of the flow blocking part or a pie-shaped cylinder at one end of the flow blocking part.

[0007] As a further improvement of the embodiment of the present application, the outer surface of the sealant is further provided with removable isolation material.

[0008] As a further improvement of the embodiment of the present application, the outer surface of the sealant is further provided with removable isolation material.

[0009] As a further improvement of the embodiment of the present application, the flow blocking part is composed of a plurality of flow blocking part bodies, at least one of which is hollow and provided with a one-way exhaust device at one end, the one-way exhaust device being made of soluble material which is soluble in the pipeline conveying medium.

[0010] As a further improvement of the embodiment of the present application, the one-way exhaust device is a check valve provided at one end of the flow blocking part body.

[0011] As a further improvement of the embodiment of the present application, the one-way exhaust device is a through hole provided at both ends of the flow blocking part body, one of which is further provided with a hole cover connected to the flow blocking part body and a check structure matched with the hole cover.

[0012] As a further improvement of the embodiment of the present application, the flexible extension extends outward from the side surface of the flow blocking part and forms an angle with the axial direction of the flow blocking part, the angle being 0-90 degrees.

[0013] The present application has the advantages and positive effects that:

[0014] (1) The present application specifies safe construction operation specifications for replacing and repairing dangerous pipelines for conveying natural gas, dangerous chemicals, and oil, shortens the time of hot work operation, and improves production efficiency. The multi-level sealing ensures the sealing and safety.

[0015] (2) The multi-level sealing multi-section soluble pipeline plugging device and the required auxiliary materials are made of soluble materials, which can be completely decomposed, do not need to be taken out, do not pollute and block the pipeline, are biodegradable, and do not pollute the environment.

[0016] (3) The operation is simple, no additional power is needed, and the operator can quickly complete the installation, reducing a large amount of preparation work in the early stage and saving resources;

[0017] (4) The product itself has high strength, uniform stress, strong pressure resistance, effectively prevents accidents, and improves the safety of dangerous pipelines during construction;

[0018] (5) The product is packaged in the form of a complete repair kit, and the related auxiliary materials used from pipeline cleaning to installation are uniformly packaged into one package, making the use more convenient;

[0019] (6) The pipeline can be closed without using sealing glue due to the setting of multiple flexible extensions and the cooperation between the flexible extensions. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 is a structural schematic diagram of the present application;

[0022] Figure 2 is a structural schematic diagram of the bottom of the plugging device of the present application;

[0023] Figure 3 is a structural schematic diagram of the closed end of the bottom of the plugging device of the present application;

[0024] Figure 4 is a sectional view of the bottom of the plugging device of the present application;

[0025] Figure 5 is a structural schematic diagram of the flow blocking part of the present application;

[0026] In the figure, the flow blocking part 1, the flexible extension 2, the sealing glue 3, the isolation material 4, the through hole 5, the hole cover 6, and the non-return structure 7.

[0027] DETAILED DESCRIPTION: The present application will be described in detail below in combination with the specific embodiments shown in the drawings. However, these embodiments do not limit the present application, and the changes in structure, method, or function made by those skilled in the art based on these embodiments are included in the protection scope of the present application.

[0028] In the various drawings of the present application, certain dimensions of structures or portions can be exaggerated relative to other structures or portions for purposes of illustration, and thus, are used merely to illustrate the general structures of the present application.

[0029] In addition, terms, such as "upper", "above", "lower", "below", and the like that are used herein for purposes of description to describe one element or feature's relationship to another element(s) or feature(s) as the device is shown in the figures. Spatially relative terms can be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, elements described as "below" or "under" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0030] As shown in the drawings, Figures 1-5 A multi-layer soluble pipe plugging device includes at least one flow blocking part with a closed bottom, and flexible extensions arranged along the side of the flow blocking part. The flexible extensions are arranged along the axial direction of the flow blocking part. The flow blocking part and the flexible extensions are made of soluble material that is soluble in the pipe conveying medium. The flexible extensions can have different outer diameters, and the outer diameter of a single flexible extension can be irregular. The multi-layer sealing of the flow blocking part, the flexible extensions, and the pipe can achieve pipe plugging without using sealant.

[0031] Of course, to enhance the sealing effect of the pipe, the flexible extensions can be made of sealant, or the outer surface of the flexible extensions can be coated with sealant. To ensure the efficiency of pipe maintenance, the sealant can also be made of soluble material that is soluble in the pipe conveying medium.

[0032] To make the installation of the plugging device more convenient and easy when using sealant or coating the surface of the flexible extension with sealant, the outer surface of the sealant is also provided with removable release material. The release material can be a release material such as release paper. The release material can be removed before installation or after entering the pipe. This can facilitate installation and also facilitate transportation and production of the plugging device product.

[0033] Further, when using sealant or flexible extension coating sealant, in order to facilitate installation, sleeve can also be used. The inner wall of the sleeve is coated or pasted with isolation material such as silicone oil, which can prevent the sealant from sticking. Without using isolation materials such as release paper, the sleeve is configured with the occluder as a set before transportation or installation, and is removed after installation in the pipeline. In the case of using isolation materials such as release paper, the sleeve can be provided with an isolation material removal slot, and the isolation material is directly removed from the removal slot, or an extension part is provided on the isolation material which can extend out of the removal slot, so that the isolation material can be removed more conveniently, and the sleeve is removed after installation to complete the installation.

[0034] The flow blocking part can be composed of one or more flow blocking part body parts. In order to facilitate production and installation, the flow blocking part can be divided into multiple flow blocking part body parts, and the design of the flow blocking part body parts can be freely combined according to the sealing requirements of the pipeline.

[0035] The end of the flow blocking part extending into the pipeline is closed, and the flow blocking part is hollow, which can accelerate dissolution. When multiple flow blocking part body parts are used, the end of the innermost part extending into the pipeline is closed, and the flow blocking part body part installed thereafter is provided with a one-way exhaust device at the end opening towards the pipeline, so as to facilitate the exhaust of the gas blocked between the two flow blocking part body parts. The one-way exhaust device is made of a soluble material that can be dissolved in the pipeline medium. The one-way exhaust device can be a check valve made of a soluble material that can be dissolved in the pipeline medium, and the closed valve is circular or semicircular, which can rotate around the shaft provided at the end. In order to meet higher pressure requirements, the exhaust device can also be a through hole provided at both ends of the flow blocking part body part, wherein the end opening towards the pipeline is further provided with a hole cover connected with the flow blocking part body part and a check structure matched with the hole cover. The check structure can be a step-shaped or ring-shaped protrusion provided along the through hole, which is used to block the movement of the hole cover towards the end of the pipeline; or it can be a columnar body provided above and below, which is used to block the movement of the hole cover towards the end of the pipeline.

[0036] Further, for working environments with more stringent sealing requirements, sealant can also be added. The sealant can be annular along the inner wall of the pipeline on the side of the flow blocking part, or pie-shaped cylindrical body provided at one end or in the middle of the flow blocking part body part.

[0037] The flexible extension extends outward from the side of the flow blocking part and forms an angle with the axis of the flow blocking part, and the angle is 0-90 degrees. The formed angle can make the occluder expand in the direction of pressure when under pressure, thereby forming better sealing effect and being able to withstand greater pressure.

[0038] After installation, the pressure in the pipeline first pushes the resistance part, and the resistance part is pressed after being stressed. The soluble sealant is filled in the frustum-shaped hole in the middle of the resistance part. The pressure continues to extrude the other resistance part, and the other resistance part is extruded by the pressure. The sealant is extruded to the accommodation part of the annular groove outside the resistance part. In this way, the sealing performance of the product is improved.

[0039] The outside of the resistance part is provided with a flexible extension in the form of a spring sheet structure forming a barb shape in the push-in direction. It can be pushed in, and when the pressure in the pipeline appears, it pushes the resistance part backward. The edge of the resistance part is similar to a spring sheet structure, which is opposite to the pipe wall, increasing the friction. The pressure resistance is improved. The inside of the resistance part is a hollow part, and the resistance part is provided with a one-way exhaust valve. The gas in the middle is discharged during installation.

[0040] The edge of the resistance part is a multi-layer annular flexible or elastic ring-shaped body in the form of a barb. When the barb is pushed into the pipeline, it is in the same direction, and when it is taken out, it is in the opposite direction. The inside of the resistance part is a hollow part in the form of a frustum. The inside of the resistance part is designed as a hollow frustum. The barb of the resistance part is installed in the same direction, and it is in the opposite direction under pressure.

[0041] 1. The use steps of the plugging device without sealant are as follows:

[0042] (1) Cut off the old pipeline to be replaced or repaired by cold cutting;

[0043] (2) Clean the inner walls of the old pipeline on both sides of the cut-off part in step (1) to an oil-free state using a clean cloth;

[0044] (3) Push in the resistance part, or push in the resistance part body in sequence, with the closed end of the resistance part facing inward into the pipeline interior, so that the resistance part tightly abuts the inner wall of the pipeline;

[0045] (4) The other end of the pipeline is also prepared according to the above steps;

[0046] (5) Push in the new pipeline to the cut-off part in step (1);

[0047] (6) Weld the new pipeline to the old pipeline;

[0048] 2. The use steps of the plugging device with sealant or flexible extension coated with sealant are as follows:

[0049] (1) Cut off the old pipeline to be replaced or repaired by cold cutting;

[0050] (2) Clean the inner walls of the old pipeline on both sides of the cut-off part in step (1) to an oil-free state using a clean cloth;

[0051] (3) According to the temperature conduction generated by the welding opening, the temperature of the product is less than 80℃, and the position is determined first. The first flow blocking part body is installed in the pipeline.

[0052] (4) For the plugger without sleeve, the sealant is coated in the pipeline or one end of the flow blocking part, or the sealant is coated in the groove formed by the two flexible extensions, the flow blocking part is closed inwardly into the pipeline, and the soluble sealant is coated on the flow blocking part; the sealant is pasted with isolation material, and the isolation material is removed after entering the pipeline.

[0053] For the plugger using sleeve, whether the sealant is prefabricated or constructed on site, or the sealant has isolation material such as release paper, first put the plugger into the sleeve, then put it into the pipeline, remove the isolation material, then separate the sleeve from the plugger, and make the sleeve withdraw from the pipeline, leaving the plugger in the pipeline;

[0054] For the flow blocking part with multiple flow blocking part bodies, each flow blocking part body is installed according to the above steps, and the next flow blocking part is installed to repeat the process.

[0055] (5) The other end of the pipeline is also done according to the above steps.

[0056] (6) Push the new pipeline into the cut-off place in step (1);

[0057] (7) Weld the new pipeline to the old pipeline.

[0058] The application has the following advantages by adopting the above scheme:

[0059] (1) The safe construction operation specification is formulated when the dangerous pipeline for transporting natural gas, transporting dangerous chemicals and transporting oil is replaced and repaired, the time of hot work operation is shortened, and the production efficiency is improved.

[0060] (2) The multilayer sealing multi-section soluble pipeline plugger and the required auxiliary materials are made of soluble materials, which can be completely decomposed, do not need to be taken out, will not pollute and block the pipeline, can be biodegradable and will not pollute the environment;

[0061] (3) The operation is simple, no additional power is needed, and the operator can quickly complete the installation manually, reducing a large amount of preparation work in advance and saving resources;

[0062] (4) The product itself has high strength, uniform stress and strong pressure resistance, effectively preventing accidents and improving the safety of dangerous pipelines during construction.

[0063] (5) The product is packaged in the form of a complete repair package, and the related auxiliary materials used from pipeline cleaning to installation completion are packaged in one package, making the use more convenient.

[0064] Although the specific embodiments of the present application have been described above, those skilled in the art will understand that these are merely illustrative, and the scope of protection of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and such changes and modifications are all within the scope of protection of the present application.

[0065] It should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0066] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present application, and are not intended to limit the scope of protection of the present application, and any equivalent embodiments or changes made without departing from the spirit of the present application should be included within the scope of protection of the present application.

Claims

1. A multilevel dissolvable pipe plug comprising at least one flow blocking section with a closed bottom at one end, characterized in that: Flexible extensions are arranged along the side of the flow blocking part, the flexible extensions are arranged in plurality along the axial direction of the flow blocking part, the flow blocking part is made of soluble material which is soluble in the pipeline transportation medium, the flexible extensions are made of sealant which is soluble in the pipeline transportation medium, a ring-shaped sealant is arranged around the side of the flow blocking part, the flow blocking part is composed of a plurality of flow blocking part bodies, a pie-shaped cylindrical sealant is arranged at one end of the flow blocking part body, the inside of at least one of the flow blocking part bodies is a hollow structure in the shape of a circular truncated cone, and one end is provided with a one-way exhaust device, the one-way exhaust device is made of soluble material which is soluble in the pipeline transportation medium, the pie-shaped cylindrical sealant can be squeezed to fill the hollow structure in the shape of a circular truncated cone of the flow blocking part body, and further squeezing under pressure can cause the pie-shaped cylindrical sealant to be squeezed to the accommodation part of the ring-shaped groove outside the next flow blocking part body.

2. The multilevel dissolvable pipe plug of claim 1, wherein: The outer surface of the sealant is further provided with removable isolation material.

3. The multilevel dissolvable pipe plug of claim 1, wherein: The outer surface of the obturator is further provided with a detachable sleeve, and the inner wall of the sleeve is provided with isolation material which can prevent the sealant from adhering.

4. The multilevel dissolvable pipe plug of claim 1, wherein: The one-way exhaust device is a check valve arranged at one end of the flow blocking part body.

5. The multilevel dissolvable pipe plug of claim 1, wherein: The one-way exhaust device is a through hole arranged at both ends of the flow blocking part body, and one end of the through hole is further provided with a hole cover connected with the flow blocking part body and a check structure matched with the hole cover.

6. The multilevel dissolvable pipe plug of claim 1, wherein: The flexible extensions extend outward from the side of the flow blocking part and form an angle with the axial direction of the flow blocking part.

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