An in-line hole sealing device

Abstract

The utility model relates to the technical field of hole sealing of coal mine gas extraction, concretely relates to a kind of inner injection type hole sealing device.The hole sealing device includes connecting pipe, both ends of connecting pipe are communicated with mounting seat, the inner diameter of mounting seat middle section is greater than the inner diameter of the end portion away from connecting pipe, first grouting hole is equipped on two mounting seats, grouting port is equipped on one of mounting seat, bag sleeve is sleeved on mounting seat, second grouting hole is opened in connecting pipe or mounting seat, and valve core is connected to second grouting hole.Mixed after expansion agent is injected into the space enclosed by mounting seat, connecting pipe and flow guide pipe through grouting port.Expansion agent props up bag sleeve, and closed hole sealing section is formed between two bag sleeves.When the pressure generated by expansion agent reaches the opening pressure of valve core, valve core opens, expansion agent fills hole sealing section, and the effect of hole sealing is achieved.The sealing of bag is guaranteed, bag sleeve is easy to install, and the overall structure is more reasonable.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology for coal mine gas extraction, specifically to an internal injection sealing device. Background Technology

[0002] Drilling for gas extraction is the main method of coal mine gas control, and sealing the borehole is one of the key steps in drilling for gas extraction. The two-plug-one-injection type sealing device is a commonly used sealing device for boreholes.

[0003] Currently, existing two-plug-one-injection sealing devices consist of a sealing bag fixed to the outer and inner ends of a gas extraction guide pipe. A grouting pipe is installed parallel to the guide pipe, passing through the front end of the outer sealing bag and inserting into the inner sealing bag at the rear end. The grouting pipe inside both the outer and inner sealing bags has a grout outlet and a one-way valve. A grouting hole is located in the middle of the grouting pipe connecting the two sealing bags, and a valve core is located at the grouting hole. During use, a two-component polyurethane-based liquid sealing material or other sealing grout is injected into the sealing bags using the grouting pipe. When the grouting pressure exceeds the valve core's opening pressure, the valve core opens, injecting grout into the sealing section between the two sealing bags, thus achieving the sealing purpose.

[0004] While existing two-plug-one-injection sealing devices facilitate sealing, they suffer from the following problems: First, the existing two-plug-one-injection sealing device has an unreasonable structural design. The injection pipe and the guide pipe are set in parallel, and the connection constraint between the injection pipe and the bladder is weak. When the injection pipe or bladder is disturbed by external forces, the sealing performance at the connection between the injection pipe and the bladder is easily damaged. Second, a single injection pipe needs to pass through two bladders to inject grout into the bladder, and the connection between the bladder and the injection pipe needs to be sealed separately, which reduces the sealing performance of the bladder and thus reduces the sealing effect of the bladder. Utility Model Content

[0005] To address the aforementioned deficiencies, the technical problem to be solved by this utility model is to provide an internal injection sealing device. This sealing device has a more reasonable structure, better sealing performance of the bag, and the seal of the bag is not easily damaged.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: An internal injection sealing device is provided, comprising a connecting pipe, both ends of which are connected to tubular mounting seats. The inner diameter of the middle section of the mounting seat is larger than the inner diameter of the end furthest from the connecting pipe. Each of the two mounting seats is provided with a first grouting hole, and one of the mounting seats is provided with a grouting port. The grouting port is connected to the internal space of the middle section of the mounting seat. A cylindrical bladder sleeve is fitted onto the mounting seat, and both ends of the bladder sleeve are sealed to the mounting seat. The first grouting hole is located within the coverage area of ​​the bladder sleeve, and the grouting port is located outside the coverage area of ​​the bladder sleeve. A second grouting hole is provided on the mounting seat located outside the coverage area of ​​the bladder sleeve and near the end of the connecting pipe, or on the connecting pipe. The second grouting hole is connected to a valve core.

[0007] By adopting the above scheme, during use, the gas extraction guide pipe is inserted into the connecting pipe and two mounting seats, with the end of the mounting seat away from the connecting pipe sealed to the guide pipe. The mounting seats, connecting pipe, and guide pipe are placed into the gas extraction hole. A uniformly mixed two-component polyurethane expanding agent is injected through the grouting port into the space enclosed by the mounting seats, connecting pipe, and guide pipe. After the A and B components of the expanding agent react, they foam and expand. The expanded grout enters the space enclosed between the bladder sleeve and the mounting seat through the first grouting hole, thus supporting the bladder sleeve to form a bladder. The outer sides of both bladder sleeves are tightly fitted to the gas extraction hole, thus completing the initial seal. The portion between the two bladders forms a closed sealing section. When the pressure generated by the expanding agent in the space enclosed by the mounting seat, connecting pipe, and guide pipe reaches the valve core opening pressure, the valve core opens, and the expanding agent enters the sealing section. The expanding agent fills the sealing section and injects into the cracks in the gas extraction hole wall, further enhancing the sealing effect. The gas extraction bag is sealed only to the mounting base, eliminating the need for a grouting pipe to pass through it. This reduces the risk of damage to the bag and ensures its airtightness. The mounting base provides a convenient installation location for the gas extraction bag. A connecting pipe between the two mounting bases further enhances structural stability. The gas extraction pipe is cleverly utilized to form a chamber to contain the expansion agent, resulting in a more rational overall structure.

[0008] Preferably, the grouting port is connected to a grouting pipe. Grout can be easily injected into the grouting port through the grouting pipe.

[0009] Preferably, the grouting pipe is equipped with a stirring core for agitating the fluid flowing through it. The stirring core facilitates the uniform mixing of the A and B components of the two-component polyurethane expanding agent, which is then conveniently pumped into the grouting pipe via a delivery pump. Specifically, in existing technology, the A and B components of the two-component polyurethane expanding agent are typically mixed in a mixer before being fed into a sealing device via a delivery pipe, which is generally inserted to a depth of approximately 20m into the extraction hole. Because the overall viscosity of the A and B components of the two-component polyurethane expanding agent increases after mixing, the conveying resistance increases, making the pipe prone to bursting during long-distance pumping. With this solution, since the stirring core is located inside the grouting pipe, the A and B components are conveyed separately. As the A and B components pass through the stirring core, they are mixed under its agitating action. During use, the A and B components of the two-component polyurethane expanding agent are not mixed before being conveyed to the stirring core, resulting in lower conveying resistance and easier conveying.

[0010] Preferably, the mounting base has a first venting groove longitudinally formed on its outer side. One end of the first venting groove is within the coverage area of ​​the gas bag sleeve; the other end of the first venting groove is outside the coverage area of ​​the gas bag sleeve and is close to the end of the mounting base away from the connecting pipe. When grout is injected into the inside of the gas bag sleeve, the air inside the gas bag sleeve can be discharged through the first venting groove, thereby allowing the expanding agent to fill the inner space of the gas bag sleeve and enhancing the sealing between the gas bag sleeve and the gas extraction hole.

[0011] Preferably, the first exhaust groove is provided with a first exhaust pipe, one end of which is located within the coverage area of ​​the pouch sleeve, and the other end of which is located outside the coverage area of ​​the pouch sleeve. The first exhaust pipe facilitates the discharge of gas from inside the pouch sleeve.

[0012] Preferably, the mounting base has a second venting groove along its longitudinal direction on its outer side, with both ends of the second venting groove located outside the coverage area of ​​the pouch sleeve. The second venting groove facilitates the discharge of gas and water from the sealed section between the two pouches formed after the two pouch sleeves are supported, and the expanding agent can further fill the space within the sealed section.

[0013] Preferably, the second exhaust groove is provided with a second exhaust pipe, both ends of which are located outside the coverage area of ​​the pouch. The second exhaust pipe allows for convenient discharge of air and water.

[0014] Preferably, the inner diameter of the end of the mounting base connected to the connecting pipe is smaller than the inner diameter of the middle section of the mounting base, and the inner diameter of the end of the mounting base near the connecting pipe is larger than the inner diameter of the other end of the mounting base.

[0015] Preferably, the connecting pipe and the mounting base are detachably connected. This detachable connection facilitates the installation and removal of the mounting base and the connecting pipe.

[0016] Preferably, the mounting base has a first annular groove and a second annular groove on its outer side, which correspond one-to-one with the two ends of the pouch sleeve. The two ends of the pouch sleeve are respectively fixed in the first annular groove and the second annular groove. The first annular groove and the second annular groove can facilitate the positioning of the pouch sleeve and improve the sealing between the pouch sleeve and the integrated base. Attached image description: To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 any novel effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model (partial cross-section of the first and second grouting holes); Figure 2 yes Figure 1 An enlarged view of point a in the middle; Figure 3 This is a three-dimensional structural diagram of the mounting base in this utility model from a first-view perspective; Figure 4 This is a three-dimensional structural diagram of the mounting base in this utility model from a second perspective; Figure 5 This is a schematic diagram of the structure of this utility model in use.

[0018] The reference numerals in the attached drawings include: connecting pipe 1, mounting base 2, first grouting hole 3, grouting port 4, bladder sleeve 5, second grouting hole 6, valve core 7, grouting pipe 8, first venting groove 9, second venting groove 10, second venting pipe 11, guide pipe 12, extraction hole 13, sealing section 14, first annular groove 15, and second annular groove 16. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of this utility model, the following description is provided in conjunction with the appendix. Figure 1-5 The present invention will be further described in detail below with reference to specific embodiments.

[0020] Please see Figure 1-5 This embodiment provides an internal injection sealing device, including a connecting pipe 1. Both ends of the connecting pipe 1 are connected to tubular mounting seats 2, and the connecting pipe 1 and the mounting seats 2 are coaxially arranged. For details on the mounting seat 2, please refer to [link to relevant documentation]. Figure 2The inner diameter of the middle section of the mounting base 2 is larger than the inner diameter of its left and right ends, and the inner diameter of the end of the mounting base 2 near the connecting pipe 1 is larger than the inner diameter of the end of the mounting base 2 away from the connecting pipe 1. Both mounting bases 2 are provided with a first grouting hole 3, preferably located in the middle of the mounting base 2. A grouting port 4 is provided on the mounting base 2 connected to the left end of the connecting pipe 1. The grouting port 4 communicates with the internal space of the middle section of the mounting base 2 and is located near the left end of the mounting base 2. A cylindrical bladder 5 is fitted onto the middle section of the mounting base 2, and both ends of the bladder 5 are sealed to the mounting base 2. Specifically, the two ends of the bladder 5 can be fixed to the outside of the mounting base 2 by cable ties, thereby sealing the bladder 5 with the mounting base 2. To enhance the sealing between the bladder 5 and the mounting base 2, sealing adhesive or other sealing methods can be added to further enhance the sealing between the ends of the bladder 5 and the mounting base 2. The first grouting hole 3 is located within the coverage area of ​​the bladder sleeve 5, and the grouting port 4 is located outside the coverage area of ​​the bladder sleeve 5. A second grouting hole 6 is provided on the connecting pipe 1 or the mounting base 2. The second grouting hole 6 is connected to a valve core 7. When the pressure inside the valve core 7 reaches a preset value, the valve core 7 can open, thereby connecting the internal space of the mounting base 2 with the external space. The valve core 7 is existing technology. Specifically, the valve core 7 can be a rubber sleeve, a cover plate, a filter element, a filter sleeve, or a microporous tube. If a rubber sleeve is used as the valve core, the rubber sleeve is fitted onto the second grouting hole 6. When the pressure at the second grouting hole 6 reaches the preset value, the rubber sleeve is forced open, thereby opening the second grouting hole 6. If a cover plate is used as the valve core, the cover plate is adhered to the outside. When the pressure at the second grouting hole 6 reaches the preset value, the cover plate is forced open, thereby opening the second grouting hole 6; thus connecting the internal space of the mounting base 2 with the external space.

[0021] Please see Figure 2 In this preferred embodiment, the second grouting hole 6 is formed on the mounting base 2. In the configuration where the second grouting hole 6 is formed on the mounting base 2, the second grouting hole 6 is located outside the coverage area of ​​the bladder sleeve 5, and the second grouting hole 6 is located near the end of the connecting pipe 1.

[0022] To facilitate the mixing and delivery of the two-component polyurethane expanding agent, the grouting port 4 is connected to a grouting pipe 8. The grouting pipe 8 contains a stirring core for agitating the fluid flowing through it. This stirring core is existing technology, specifically the core of an AB mixing pipe or a spiral mixing pipe.

[0023] Please see Figure 3-4The mounting base 2 has a first vent groove 9 longitudinally formed on its outer side. The lower end of the first vent groove 9 is located within the coverage area of ​​the pouch sleeve 5, specifically at the middle section of the mounting base 2. The upper end of the first vent groove 9 is located outside the coverage area of ​​the pouch sleeve 5 and close to the upper end of the mounting base 2. The first vent pipe facilitates the discharge of gas from the inside of the pouch sleeve 5, allowing the expanding agent to fill the pouch and enhancing the sealing effect. In the prior art, to discharge gas from the pouch, one end of the vent pipe is usually inserted into the pouch, and the gas is discharged through the vent pipe. The connection between the vent pipe and the pouch needs to be sealed. In this solution, there is no need to open a hole in the pouch sleeve 5 to connect the vent pipe, further ensuring the integrity of the pouch sleeve 5 and thus guaranteeing its sealing performance.

[0024] Please continue reading. Figure 3-4 To facilitate positioning during installation of the pouch sleeve 5 and enhance the seal between the pouch sleeve 5 and the mounting base 2, a first annular groove 15 and a second annular groove 16 are further provided on the outer side of the mounting base 2. The first annular groove 15 is located in the upper section of the mounting base 2, and the second annular groove 16 is located in the lower section of the mounting base 2. A first grouting hole 3 is located between the first annular groove 15 and the second annular groove 16, and a second grouting hole 6 is located between the second annular groove 16 and the lower end of the mounting base 2. In use, both ends of the pouch sleeve 5 are secured within the first annular groove 15 and the second annular groove 16 by binding.

[0025] Please continue reading. Figure 3-4 The first exhaust groove 9 is provided with a first exhaust pipe. One end of the first exhaust pipe is located within the coverage area of ​​the pouch sleeve 5, and the other end of the first exhaust pipe is located outside the coverage area of ​​the pouch sleeve 5.

[0026] Please see Figure 4 The mounting base 2 has a second exhaust groove 10 longitudinally formed on its outer side. The upper and lower ends of the second exhaust groove 10 are both outside the coverage area of ​​the pouch sleeve 5. The upper and lower ends of the second exhaust groove 10 are close to the upper and lower ends of the corresponding mounting base 2.

[0027] Please see Figure 2 The second exhaust groove 10 contains a second exhaust pipe 11, both ends of which are outside the coverage area of ​​the bag sleeve 5. The first exhaust groove 9, the second exhaust groove 10, and the first grouting hole 3 are staggered relative to each other in the circumferential direction of the mounting base 2. For details, please refer to [link / reference]. Figure 3-4 The first venting groove 9 is located on the left side of the mounting base 2, the second venting groove 10 is located on the right side of the mounting base 2, and the first grouting hole 3 is located on the front side of the mounting base 2.

[0028] For ease of installation, the connecting pipe 1 and the mounting base 2 are detachably connected, specifically by threaded connection.

[0029] By adopting the above scheme, in the initial state, the inner side of the bag sleeve 5 is tightly attached to the outer surface of the mounting base 2. After the expanding agent enters the inner side of the bag sleeve 5, the bag sleeve 5 can be expanded under the pressure of the expanding agent, thus forming a cylindrical bag. In use, the guide pipe 12 for gas extraction is inserted into the connecting pipe 1 and the two mounting bases 2, sealing the connection between the smallest inner diameter end of the mounting base 2 and the guide pipe 12. The mounting base 2, connecting pipe 1, and guide pipe 12 are placed into the gas extraction hole 13. The uniformly mixed two-component polyurethane expanding agent is injected into the space enclosed by the mounting base 2, connecting pipe 1, and guide pipe 12 through the grouting pipe 8 and grouting port 4. After the AB components of the expanding agent react, they foam and expand. The expanded slurry enters the space enclosed between the bag sleeve 5 and the mounting base 2 through the first grouting hole 3, thereby expanding the bag sleeve 5 to form a bag. The outer sides of both bag sleeves 5 are tightly attached to the gas extraction hole 13, thus completing the initial seal. The section between the two bags forms a closed sealing section 14. When the pressure generated by the expanding agent in the space enclosed by the mounting base 2, connecting pipe 1, and guide pipe 12 reaches the opening pressure of the valve core 7, the valve core 7 opens, and the expanding agent enters the sealing section 14. The expanding agent fills the sealing section 14 and injects it into the cracks in the wall of the gas extraction hole 13, further enhancing the sealing effect. Please refer to the figure. After sealing, the bag sleeve 5 is supported in a cylindrical shape (the bag is cylindrical after being supported; the overall shape of the bag sleeve 5 is limited by the shape of the gas extraction hole 13 and may not be a regular cylindrical shape). The state of the sealing section 14 filled with expanding agent in the gas extraction hole 13 is shown in the figure. The bag sleeve 5 is only sealed to the mounting base 2, without the need for a grouting pipe to pass through it. The bag sleeve 5 is not easily damaged, ensuring its sealing performance. The mounting base 2 provides an installation position for the bag sleeve 5, facilitating bag installation. The two mounting bases 2 are connected by the connecting pipe 1, further enhancing structural stability. The gas extraction pipe is cleverly used to form a chamber to contain the expanding agent, making the overall structure more reasonable.

[0030] It should be noted that words indicating direction in this article, such as "up" and "down," are all in the format of "upper" and "lower." Figure 1 The direction setting is for ease of description only and has no other specific meaning.

[0031] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.

[0032] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. An internal injection sealing device, characterized in that, The device includes a connecting pipe (1), both ends of which are connected to tubular mounting seats (2). The inner diameter of the middle section of the mounting seat (2) is larger than the inner diameter of the end away from the connecting pipe (1). Both mounting seats (2) are provided with first grouting holes (3). One of the mounting seats (2) is provided with a grouting port (4). The grouting port (4) is connected to the internal space of the middle section of the mounting seat (2). A cylindrical bladder sleeve (5) is fitted on the mounting seat (2). Both ends of the bladder sleeve (5) are sealed to the mounting seat (2). The first grouting hole (3) is located within the coverage area of ​​the bladder sleeve (5). The grouting port (4) is located outside the coverage area of ​​the bladder sleeve (5). A second grouting hole (6) is provided on the end of the mounting seat (2) located outside the coverage area of ​​the bladder sleeve (5) and close to the connecting pipe (1) or on the connecting pipe (1). The second grouting hole (6) is connected to a valve core (7).

2. The internal injection sealing device according to claim 1, characterized in that, The grouting port (4) is connected to the grouting pipe (8).

3. The internal injection sealing device according to claim 2, characterized in that, The grouting pipe (8) is provided with a stirring core, which is used to stir the fluid flowing through the grouting pipe (8).

4. The internal injection sealing device according to claim 1, characterized in that, The mounting base (2) has a first exhaust groove (9) longitudinally opened on the outer side. One end of the first exhaust groove (9) is located within the coverage area of ​​the pouch sleeve (5); the other end of the first exhaust groove (9) is located outside the coverage area of ​​the pouch sleeve (5) and close to the end of the mounting base (2) away from the connecting pipe (1).

5. The internal injection sealing device according to claim 4, characterized in that, The first exhaust groove (9) is provided with a first exhaust pipe.

6. The internal injection sealing device according to claim 1, characterized in that, The mounting base (2) has a second exhaust groove (10) longitudinally opened on the outside, and both ends of the second exhaust groove (10) are located outside the coverage area of ​​the pouch sleeve (5).

7. An internal injection sealing device according to claim 6, characterized in that, The second exhaust groove (10) is provided with a second exhaust pipe (11), and both ends of the second exhaust pipe (11) are located outside the coverage area of ​​the pouch sleeve (5).

8. The internal injection sealing device according to claim 1, characterized in that, The inner diameter of the end of the mounting base (2) connected to the connecting pipe (1) is smaller than the inner diameter of the middle section of the mounting base (2), and the inner diameter of the end of the mounting base (2) near the connecting pipe (1) is larger than the inner diameter of the other end of the mounting base (2).

9. An internal injection sealing device according to claim 1, characterized in that, The connecting pipe (1) is detachably connected to the mounting base (2).

10. An internal injection sealing device according to claim 1, characterized in that, The mounting base (2) has a first annular groove (15) and a second annular groove (16) on its outer side that correspond one-to-one with the two ends of the pouch sleeve (5). The two ends of the pouch sleeve (5) are respectively fixed in the first annular groove (15) and the second annular groove (16).

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