Automatic plugging device for mine gas leakage pipeline

Abstract

The utility model provides an automatic plugging device for a mine gas leakage pipeline, which relates to the technical field of plugging devices and comprises a collecting pipe, an air bag, an elastic bag, a threaded elastic sheet and an air valve. According to the utility model, the elastic bag structure is used for triggering the radial expansion of the elastic bag structure by utilizing the energy of leaked air flow to form preliminary dynamic sealing, and the elastic bag structure and the multi-air-chamber air bag which can be independently controlled later jointly form a multi-stage sealing barrier, so that quick and automatic plugging and controllable dredging of a leakage point are realized; the reliability, the adaptability and the safety of plugging are obviously improved; the elastic extension part adopts a flexible structure of which the thickness of the annular wall is gradually changed, so that a convex annular sealing lip can be preferentially generated from the middle part when the elastic extension part is pressed, and the sealing lip is adaptively attached to the inner walls of pipelines with different diameters, ovality or unevenness due to the design; and the manufacturing tolerance of the pipeline and the deformation caused by long-term use are effectively compensated, and effective sealing can be ensured to be formed under various complex working conditions.

Description

Technical Field

[0001] This utility model relates to the field of sealing device technology, and more specifically, to an automatic sealing device for mine gas leakage pipelines. Background Technology

[0002] During coal mining, when the original structure of the coal seam is damaged or disturbed by mining activities, free gas originally contained in the pores of the coal body breaks through the matrix constraints and migrates and diffuses into the mining area. This process is defined as gas escape. Based on the differences in release characteristics, underground gas escape can be divided into two basic types: slow release under normal conditions and sudden concentrated gushing. In gas control practice, pipeline diversion systems are often used to directionally guide the escaped gas. When the pipeline is damaged, the leak area must first be temporarily sealed, and the gas mixture accumulated around the pipe wall is removed by a negative pressure suction device. Welding repair is then carried out after the environment is safe. Although these technologies have certain practicality in conventional leak scenarios, their sealing effect is highly dependent on the leak location, pipeline material, and environmental conditions, and they generally suffer from high operational complexity and limited adaptability.

[0003] When high-pressure gas leaks, the curing speed of chemical adhesives decreases in low-temperature or humid environments, making it difficult to form an effective sealing layer. Temporary clamps are poorly adaptable to irregularly shaped pipes or complex leak patterns. These limitations make it difficult for existing sealing devices to achieve rapid, durable, and comprehensive leak control when dealing with sudden accidents or complex operating conditions. Utility Model Content

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: It includes a collection tube, an airbag, an elastic bladder, a threaded spring, and an air valve; the left end of the collection tube is the air outlet, and the right end is the air inlet; the air valve is fixedly installed on the left end of the collection tube and controls the opening and closing of the left end of the collection tube; the airbag is slidably sleeved in the middle section of the collection tube, and an air pump is fixedly installed on the collection tube, with the air pump and the airbag connected by an air pipe; the elastic bladder is fixedly connected to the air inlet of the collection tube, and the elastic bladder and the airbag are connected by a threaded spring; the elastic bladder includes a fixing ring, a guide ring, an elastic extension, and a gap ring; the fixing ring is fixedly installed on the collection tube, and a guide ring is slidably sleeved on the collection tube to the right of the fixing ring; an elastic extension is provided between the fixing ring and the guide ring, and the elastic extension is fixedly connected to the circumferential surface of the fixing ring and also fixedly connected to the circumferential surface of the guide ring.

[0005] Preferably, the elastic extension is in the shape of an arc-shaped ring.

[0006] Preferably, the elastic extension is made of elastic rubber, and the thickness of the elastic extension ring wall gradually increases from the middle to the two connecting ends of the fixed ring and the guide ring, forming a flexible structure with a gradually changing thickness; when subjected to axial compression, the middle part of the elastic extension preferentially expands radially to form a protruding annular sealing lip.

[0007] Preferably, the airbag contains multiple independent air chambers.

[0008] Preferably, the airway includes a main airway and multiple branch airways. The air pump is connected to one end of the main airway, and the other end of the main airway is connected to multiple branch airways. Each branch airway is connected to an independent air chamber. The air pump connects to multiple air chambers of the airbag through the main airway and the branch airways.

[0009] Preferably, the radial length of the threaded spring is less than the radial length of the airbag and the elastic bladder.

[0010] Preferably, the guide ring is trumpet-shaped, with the wide opening of the trumpet facing to the right.

[0011] Preferably, a gap ring is provided between the guide ring and the collecting pipe, the gap ring is fixedly connected to the guide ring, and multiple axial gaps are formed on the gap ring.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] I. This utility model utilizes the energy of the leaking airflow itself to trigger radial expansion of the elastic bladder structure to form a preliminary dynamic seal. It works in conjunction with the independently controllable multi-chamber air bladders to construct a multi-level sealing barrier, thereby achieving rapid automatic sealing and controllable drainage of the leak point, significantly improving the reliability, adaptability and safety of the sealing.

[0014] Second, the elastic extension section of this utility model adopts a flexible structure with gradually varying ring wall thickness, which allows it to preferentially generate a protruding annular sealing lip from the middle when under pressure. This design enables the sealing lip to adaptively fit the inner wall of pipes with different diameters, ellipticity, or unevenness, effectively compensating for pipe manufacturing tolerances and deformation caused by long-term use, and ensuring effective sealing under various complex working conditions.

[0015] Third, the airbag in this utility model is divided into multiple independent air chambers and can be independently inflated in sections. This multi-section design allows the airbag to flexibly adapt to the local irregular shape of the pipeline, achieve precise and dead-angle-free filling of the annular space, avoid the problem of uneven sealing pressure caused by the non-circularity of the pipeline in a single air chamber, and greatly improve the sealing reliability under complex actual working conditions. Attached Figure Description

[0016] Figure 1This is the front view of the present invention.

[0017] Figure 2 This is a cross-sectional view of the present invention.

[0018] Figure 3 for Figure 2 Enlarged view of point A.

[0019] Figure 4 This is a cross-sectional view of the elastic extension of this utility model.

[0020] In the diagram: 1. Collection tube; 2. Airbag; 3. Elastic bladder; 31. Fixing ring; 32. Guide ring; 33. Elastic extension; 34. Gap ring; 4. Threaded spring; 5. Air valve. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0022] See Figures 1-3 An automatic sealing device for a mine gas leak pipeline includes a collection pipe 1, an air bladder 2, an elastic bladder 3, a threaded spring 4, and an air valve 5. The left end of the collection pipe 1 is the air outlet, and the right end is the air inlet. The air valve 5 is fixedly installed on the left end of the collection pipe 1 and controls the opening and closing of the left end. The air bladder 2 is slidably sleeved on the middle section of the collection pipe 1, and an air pump is fixedly installed on the collection pipe 1. The air pump and the air bladder 2 are connected via an air pipe. The elastic bladder 3 is fixedly connected to the air inlet of the collection pipe 1, and the elastic bladder 3 is connected to the air bladder 2 via a threaded spring 4. The elastic bladder 3 includes a fixing ring 31, a guide ring 32, and an elastic extension ring 4. The device includes an extension 33 and a gap ring 34. The fixing ring 31 is fixedly installed on the collecting pipe 1. A guide ring 32 is slidably sleeved on the collecting pipe 1 to the right of the fixing ring 31. A gap ring 34 is provided between the guide ring 32 and the collecting pipe 1. The gap ring 34 is fixedly connected to the guide ring 32. Multiple axial gaps are provided on the gap ring 34. An elastic extension 33 is provided between the fixing ring 31 and the guide ring 32. The elastic extension 33 is fixedly connected to the circumferential surface of the fixing ring 31 and the circumferential surface of the guide ring 32. The guide ring 32 is trumpet-shaped with the wide opening facing to the right.

[0023] Specifically, when a gas pipeline leaks, the high-speed surging airflow first impacts the guide ring 32 at the front end of the elastic bladder 3. The trumpet-shaped structure of the guide ring 32 converts the axial kinetic energy of the impacting airflow into an axial thrust on the guide ring 32, forcing the entire guide ring 32 to drive the fixed gap ring 34 to slide along the collection pipe 1 toward the air bladder 2. The elastic extension 33 connecting the fixed ring 31 and the guide ring 32 is forced to undergo axial compression, protruding and bending in the radial direction to form an outwardly expanding arched sealing structure that fits tightly against the inner wall of the leaking pipeline, achieving a preliminary dynamic seal.

[0024] At the same time, at the instant the guide ring 32 is pushed and moved, the relative movement between it and the collecting pipe 1 causes the gap formed by the gap ring 34 to open. Some of the high-pressure leaked gas is not completely introduced into the collecting pipe 1, but is quickly pressed into the cavity formed by the elastic extension 33, the fixed ring 31 and the guide ring 32 through the gap. The gas rushing into the cavity further increases the pressure inside the cavity. This pressure acts violently from the inside on the deforming elastic extension 33, providing an additional strong driving force for its radial expansion and deformation, thereby significantly enhancing the contact pressure between the arched sealing structure and the inner wall of the pipe, making the initial seal faster and more reliable.

[0025] Simultaneously, the air pump on the collection pipe 1 starts working, rapidly filling the air bladder 2 located behind the elastic bladder 3 with gas through the air pipe; the air bladder 2 then expands, and its outer surface acts as an independent and controllable seal, tightly filling any remaining annular space that may exist between the elastic bladder 3 and the inner wall of the pipe, forming a second solid sealing barrier; this barrier not only further blocks the gas leakage path, but its stable structure also provides solid rear support for the elastic bladder 3, which is in a dynamically fluctuating sealing state at the front end, enhancing the overall stability and reliability of the entire sealing device in the working state.

[0026] With the successful establishment of two sealing barriers, the leaked gas flow is effectively confined within the pipe between the inlet of the collection pipe 1 and the gas valve 5. The gas that was originally spraying outward is now introduced and passes through the collection pipe 1. Operators can controllably export or discharge the collected gas through the gas valve 5 located at the outlet end according to the on-site safety requirements, thereby reducing the risk of explosion or poisoning caused by the accumulation of leaked gas and achieving safe and controllable treatment of leaked gas.

[0027] See Figures 1-2 , Figure 4 The elastic extension 33 is an arc-shaped ring made of elastic rubber. The thickness of its ring wall gradually increases from the middle to the two connecting ends of the fixed ring 31 and the guide ring 32, forming a flexible structure with a gradually changing thickness. When subjected to axial compression, the middle part of the elastic extension 33 preferentially expands radially to form a protruding annular sealing lip.

[0028] The elastic extension 33 of this utility model adopts a flexible structure with a gradually varying annular wall thickness, which allows it to preferentially generate a protruding annular sealing lip from the middle when under pressure. This design enables the sealing lip to adaptively fit the inner wall of pipes with different diameters, ellipticity, or unevenness, effectively compensating for pipe manufacturing tolerances and deformation caused by long-term use, and ensuring effective sealing under various complex working conditions.

[0029] See Figure 2 The airbag 2 has multiple independent air chambers inside. The air tube includes a main air tube and multiple branch air tubes. Each branch air tube is connected to an independent air chamber. The air pump is connected to the multiple air chambers of the airbag 2 through the main air tube and the branch air tubes.

[0030] The airbag 2 of this invention is divided into multiple independent air chambers and can be inflated independently in sections. This multi-section design allows the airbag 2 to flexibly adapt to the local irregular shape of the pipeline, achieve precise and dead-angle-free filling of the annular space, avoid the problem of uneven sealing pressure caused by the non-circularity of the pipeline in a single air chamber, and greatly improve the sealing reliability under complex actual working conditions.

[0031] See Figures 1-2 The radial length of the threaded spring 4 is less than the radial length of the airbag 2 and the elastic bag 3.

[0032] The threaded spring 4 can form a gas labyrinth between the airbag 2 and the elastic bag 3 to extend the leakage path and consume airflow energy. At the same time, its elasticity enhances the structural stability of the middle section of the device, preventing instability and shaking under airflow impact. Furthermore, the threaded spring 4 itself will not directly contact the pipe wall, thus affecting the expansion and fit of the main sealing body.

[0033] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A mine gas leakage pipeline automatic plugging device, characterized in that, It comprises a collecting tube, an air bag, an elastic bag, a threaded elastic sheet and an air valve. The left end of the collecting tube is an air outlet end, and the right end is an air inlet end. The air bag is slidably sleeved on the middle section of the collecting tube, and an air pump is fixedly installed on the collecting tube. The elastic bag is fixedly connected to the air inlet end of the collecting tube. The fixed ring is fixedly installed on the collecting tube. The elastic extension part is arranged between the fixed ring and the guide ring.

2. The automatic sealing device for gas leakage pipeline in coal mine according to claim 1, characterized in that, The elastic extension part is in the shape of an arc-shaped ring.

3. The automatic sealing device for gas leakage pipeline in coal mine according to claim 2, characterized in that, The elastic extension part is made of elastic rubber.

4. The automatic sealing device for gas leakage pipeline in coal mine according to claim 1, characterized in that, The thickness of the wall of the elastic extension part gradually increases from the middle part to the two connection ends of the fixed ring and the guide ring, forming a flexible structure with gradually changing thickness.

5. The automatic sealing device for gas leakage pipeline in coal mine according to claim 4, characterized in that, When subjected to axial extrusion, the middle part of the elastic extension part preferentially expands radially to form a convex annular sealing lip.

6. The automatic sealing device for gas leakage pipeline in coal mine according to claim 1, characterized in that, The air bag has multiple independent air chambers.

7. The automatic sealing device for gas leakage pipeline in coal mine according to claim 1, characterized in that, The air pipe comprises a main air pipe and multiple branch air pipes.

8. The automatic sealing device for gas leakage pipeline in coal mine according to claim 1, characterized in that, The air pump is connected to one end of the main air pipe, and the other end of the main air pipe is connected to the multiple branch air pipes. Each branch air pipe is connected to a corresponding independent air chamber. The radial length of the threaded elastic sheet is smaller than the radial length of the air bag and the elastic bag. The guide ring is in the shape of a horn, and the wide mouth of the horn faces right. The guide ring is provided with a gap ring between the guide ring and the collecting tube. The gap ring is fixedly connected to the guide ring. Multiple axial gaps are formed on the gap ring.

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