Coal mine gas extraction pipe anti-leakage sealing structure
Patent Information
- Application Number
- CN202522693826.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-19
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-12-19
AI Technical Summary
[0003]现有煤矿瓦斯抽采管通常采用O型密封圈密封连接，但是井下环境复杂，抽采管会因地质活动、采动压力、温度变化等发生振动，造成管道径向跳动，导致管道连接处结构松动，造成瓦斯泄露，同时管道振动会使密封圈与管壁持续摩擦，造成密封圈磨损或移位，导致管道磨损泄漏
[0019]本实用新型通过设置固定机构，具体是通过设置螺纹管和螺纹套，旋转螺纹套使其在螺纹管上旋进，从而将抽采管拉向连接管，产生强大的轴向预紧力，通过设置固定螺栓，通过固定螺栓连接第一螺栓座和第二螺栓座，对螺纹管和螺纹套施加保险，防止因振动导致的螺纹套回转松脱，提高装置可靠性。
Smart Images
Figure CN224904302U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal mine gas extraction pipe technology, and in particular to a leak-proof sealing structure for coal mine gas extraction pipe. Background Technology
[0002] Methane gas is formed in the early stages of coal formation from ancient plants, where cellulose and organic matter are decomposed by anaerobic bacteria. Methane gas is colorless, tasteless, and odorless. It is poorly soluble in water, does not support combustion, and cannot sustain respiration. When it reaches a certain concentration, it can cause oxygen deficiency and suffocation, and can also cause combustion or explosion. Methane explosion is one of the major hazards in coal mines. During coal mining, a large amount of methane gas is generated. Before mining, it is necessary to perform methane extraction operations in the mine.
[0003] Existing coal mine gas drainage pipes typically use O-ring seals for connection. However, the complex underground environment causes vibrations in the drainage pipes due to geological activity, mining pressure, and temperature changes. This vibrations can lead to radial runout of the pipe, loosening of the pipe connections and causing gas leaks. Simultaneously, pipe vibrations cause continuous friction between the O-ring and the pipe wall, resulting in wear or displacement of the O-ring and subsequent pipe wear leaks. During gas extraction, the impact force on the extraction pipe can cause it to move, reducing the sealing performance of the sealing layer and leading to further gas leaks. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model provides a leak-proof sealing structure for coal mine gas extraction pipes.
[0005] This utility model is achieved by the following technical solution: a leak-proof sealing structure for a coal mine gas extraction pipe, including an extraction pipe, a connecting pipe at the left end of the extraction pipe, a fixing mechanism on the surface of the connecting pipe, and a sealing mechanism on the surface of the fixing mechanism.
[0006] The fixing mechanism includes a first ring block, a threaded pipe is fixedly connected to one end of the first ring block near the extraction pipe, a threaded sleeve is threadedly connected to the surface of the threaded pipe, a first bolt seat is fixedly connected to the surface of the first ring block, a second bolt seat is fixedly connected to the surface of the threaded sleeve, a fixing bolt is slidably connected to the inner walls of the first bolt seat and the second bolt seat, and a second ring block is fixedly connected to the surface of the extraction pipe.
[0007] The above technical solution, by setting a fixing bolt and connecting the first bolt seat and the second bolt seat with the fixing bolt, provides a safety measure for the threaded pipe and the threaded sleeve, preventing the threaded sleeve from rotating and loosening due to vibration, and improving the reliability of the device.
[0008] As a further improvement to the above scheme, the inner wall of the first ring block is fixedly connected to the surface of the connecting pipe, and the inner wall of the threaded pipe is slidably connected to the surface of the extraction pipe.
[0009] As a further improvement to the above scheme, the inner wall of the threaded sleeve is slidably connected to the surface of the extraction tube, and the inner wall of the threaded sleeve is slidably connected to the surface of the second ring block.
[0010] The above technical solution involves setting up a threaded pipe and a threaded sleeve, rotating the threaded sleeve to screw it onto the threaded pipe, thereby pulling the extraction pipe toward the connecting pipe and generating a strong axial preload.
[0011] As a further improvement to the above solution, the sealing mechanism includes a tightening block, the inner wall of which is threaded with a grease injection nozzle, the inner wall of which has a grease injection hole, the inner wall of which has a grease injection ring groove, the second ring block having an O-ring fixedly connected to one end near the connecting pipe, and the inner wall of the extraction pipe having a lip-type sealing ring fixedly connected.
[0012] Through the above technical solution, by setting an O-ring, the O-ring is compressed under the action of axial preload, forming a reliable static seal between the second ring block and the end face of the connecting pipe.
[0013] As a further improvement to the above solution, the surface of the grease injection nozzle is fixedly connected to the surface of the threaded sleeve, and the grease injection hole penetrates the grease injection nozzle to the inner wall of the grease injection ring groove.
[0014] As a further improvement to the above solution, the grease injection groove is formed at the location where the O-ring is set.
[0015] Through the above technical solution, by setting a grease injection ring groove, when the device leaks slightly, sealing grease is injected through the grease injection nozzle. The sealing grease enters the grease injection ring groove through the grease injection hole and is evenly distributed to the sealing area where the O-ring is located, forming a new, flexible sealing barrier, realizing leak sealing under pressure without stopping production and improving the convenience of device maintenance.
[0016] As a further improvement to the above solution, the inner wall of the lip seal ring is provided with a groove.
[0017] Through the above technical solution, by setting a lip seal, when the gas pressure inside the pipe increases, the gas pressure acts on the inner wall of the groove of the lip seal, causing it to tightly hug the inner wall of the extraction pipe and the connecting pipe, forming a pressure self-tightening, so that the sealing capacity of the device automatically increases with the increase of gas pressure, especially adapting to pressure fluctuations inside the pipe.
[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0019] This utility model features a fixing mechanism, specifically a threaded tube and a threaded sleeve. Rotating the threaded sleeve causes it to screw into the threaded tube, thereby pulling the extraction tube toward the connecting tube and generating a strong axial preload. By setting a fixing bolt, which connects the first bolt seat and the second bolt seat, a safety measure is applied to the threaded tube and the threaded sleeve, preventing the threaded sleeve from rotating and loosening due to vibration, thus improving the reliability of the device.
[0020] This invention features a sealing mechanism, specifically a grease injection ring groove. When a minor leak occurs, grease is injected through the grease injection nozzle. The grease enters the grease injection ring groove through the injection hole and is evenly distributed in the sealing area where the O-ring is located, forming a new, flexible sealing barrier. This allows for leak sealing under pressure without interrupting production, improving the ease of device maintenance. The O-ring is compressed under axial preload, forming a reliable static seal between the second ring block and the end face of the connecting pipe. A lip seal is used; when the gas pressure inside the pipe increases, the gas pressure acts on the inner wall of the lip seal groove, causing it to tightly grip the inner walls of the extraction pipe and the connecting pipe, creating a pressure self-tightening effect. This allows the device's sealing capacity to automatically increase with increasing gas pressure, making it particularly adaptable to pressure fluctuations within the pipe. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0022] Figure 2 This is a side view of the structure of this utility model;
[0023] Figure 3 This is a schematic cross-sectional view of the present invention.
[0024] Figure 4 This is a schematic diagram of the exploded structure of this utility model;
[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of the grease injection ring groove of this utility model.
[0026] Explanation of key symbols:
[0027] 1. Extraction pipe; 2. Connecting pipe; 3. Fixing mechanism; 301. First ring block; 302. Threaded pipe; 303. Threaded sleeve; 304. First bolt seat; 305. Second bolt seat; 306. Fixing bolt; 307. Second ring block; 4. Sealing mechanism; 401. Tightening block; 402. Grease nozzle; 403. Grease injection hole; 404. Grease injection ring groove; 405. O-ring seal; 406. Lip seal. Detailed Implementation
[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.
[0029] Example:
[0030] Please combine Figure 1-5 The embodiment of this invention provides a leak-proof sealing structure for a coal mine gas extraction pipe, including an extraction pipe 1, a connecting pipe 2 at the left end of the extraction pipe 1, a fixing mechanism 3 on the surface of the connecting pipe 2, and a sealing mechanism 4 on the surface of the fixing mechanism 3.
[0031] The fixing mechanism 3 includes a first ring block 301. A threaded pipe 302 is fixedly connected to one end of the first ring block 301 near the extraction pipe 1. A threaded sleeve 303 is threadedly connected to the surface of the threaded pipe 302. A first bolt seat 304 is fixedly connected to the surface of the first ring block 301. A second bolt seat 305 is fixedly connected to the surface of the threaded sleeve 303. A fixing bolt 306 is slidably connected to the inner walls of the first bolt seat 304 and the second bolt seat 305. The first bolt seat 304 and the second bolt seat 305 are connected by the fixing bolt 306, which provides a safety measure for the threaded pipe 302 and the threaded sleeve 303 to prevent the threaded sleeve from rotating and loosening due to vibration. A second ring block 307 is fixedly connected to the surface of the extraction pipe 1.
[0032] The inner wall of the first ring block 301 is fixedly connected to the surface of the connecting pipe 2, and the inner wall of the threaded pipe 302 is slidably connected to the surface of the extraction pipe 1.
[0033] The inner wall of the threaded sleeve 303 is slidably connected to the surface of the extraction pipe 1, and the inner wall of the threaded sleeve 303 is slidably connected to the surface of the second ring block 307. Rotating the threaded sleeve 303 causes it to screw into the threaded pipe 302, thereby pulling the extraction pipe 1 toward the connecting pipe 2 and generating a strong axial preload.
[0034] The sealing mechanism 4 includes a tightening block 401, with a grease nipple 402 threadedly connected to the inner wall of the tightening block 401. The inner wall of the grease nipple 402 has a grease injection hole 403. The inner wall of the threaded sleeve 303 has a grease injection ring groove 404. An O-ring 405 is fixedly connected to one end of the second ring block 307 near the connecting pipe 2. The O-ring 405 is compressed under the action of axial preload, forming a reliable static seal between the second ring block 307 and the end face of the connecting pipe 2. A lip seal 406 is fixedly connected to the inner wall of the extraction pipe 1.
[0035] The surface of the grease injection nozzle 402 is fixedly connected to the surface of the threaded sleeve 303, and the grease injection hole 403 penetrates the grease injection nozzle 402 to the inner wall of the grease injection ring groove 404.
[0036] The grease injection groove 404 is located at the position where the O-ring 405 is installed. When the device leaks slightly, grease is injected through the grease injection nozzle 402. The grease enters the grease injection groove 404 through the grease injection hole 403 and is evenly distributed to the sealing area where the O-ring 405 is located, forming a new, flexible sealing barrier. This enables leak sealing under pressure without interrupting production and improves the convenience of device maintenance.
[0037] The inner wall of the lip seal 406 has a groove. When the gas pressure in the pipe increases, the gas pressure acts on the inner wall of the groove of the lip seal 406, causing it to tightly hug the inner wall of the extraction pipe 1 and the connecting pipe 2, forming a pressure self-tightening effect. This makes the sealing capacity of the device automatically increase with the increase of gas pressure, especially adapting to pressure fluctuations in the pipe.
[0038] The implementation principle of the anti-leakage sealing structure for a coal mine gas extraction pipe in this embodiment is as follows: During use, the threaded sleeve 303 is rotated to screw onto the threaded pipe 302, thereby pulling the extraction pipe 1 toward the connecting pipe 2. The O-ring 405 is compressed under the action of axial preload, forming a reliable static seal between the second ring block 307 and the end face of the connecting pipe 2. Then, the first bolt seat 304 and the second bolt seat 305 are connected by the fixing bolt 306 to secure the threaded pipe 302 and the threaded sleeve 303, preventing leakage due to vibration. When the threaded sleeve loosens due to rotation, the gas pressure inside the pipe increases. The gas pressure acts on the inner wall of the groove of the lip seal 406, causing it to tightly grip the inner wall of the extraction pipe 1 and the connecting pipe 2, forming a pressure self-tightening. This allows the sealing capacity of the device to automatically increase with the increase of gas pressure. When there is a minor leak in the device, sealing grease is injected through the grease injection nozzle 402. The sealing grease enters the grease injection ring groove 404 through the grease injection hole 403 and is evenly distributed to the sealing area where the O-ring 405 is located, forming a new, flexible sealing barrier, achieving leak sealing under pressure without stopping production.
[0039] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.
Claims
1. A leak-proof sealing structure for coal mine gas extraction pipes, characterized in that, It includes a sampling pipe (1), a connecting pipe (2) is provided at the left end of the sampling pipe (1), a fixing mechanism (3) is provided on the surface of the connecting pipe (2), and a sealing mechanism (4) is provided on the surface of the fixing mechanism (3). The fixing mechanism (3) includes a first ring block (301), a threaded pipe (302) is fixedly connected to one end of the first ring block (301) near the extraction pipe (1), a threaded sleeve (303) is threadedly connected to the surface of the threaded pipe (302), a first bolt seat (304) is fixedly connected to the surface of the first ring block (301), a second bolt seat (305) is fixedly connected to the surface of the threaded sleeve (303), a fixing bolt (306) is slidably connected to the inner walls of the first bolt seat (304) and the second bolt seat (305), and a second ring block (307) is fixedly connected to the surface of the extraction pipe (1).
2. The leak-proof sealing structure for a coal mine gas extraction pipe as described in claim 1, characterized in that: The inner wall of the first ring block (301) is fixedly connected to the surface of the connecting pipe (2), and the inner wall of the threaded pipe (302) is slidably connected to the surface of the extraction pipe (1).
3. The leak-proof sealing structure for a coal mine gas extraction pipe as described in claim 1, characterized in that: The inner wall of the threaded sleeve (303) is slidably connected to the surface of the extraction tube (1), and the inner wall of the threaded sleeve (303) is slidably connected to the surface of the second ring block (307).
4. The leak-proof sealing structure for a coal mine gas extraction pipe as described in claim 1, characterized in that: The sealing mechanism (4) includes a tightening block (401), the inner wall of which is threaded with a grease injection nozzle (402), the inner wall of which is provided with a grease injection hole (403), the inner wall of which is provided with a grease injection ring groove (404), the second ring block (307) is fixedly connected to one end near the connecting pipe (2) with an O-ring seal (405), and the inner wall of the extraction pipe (1) is fixedly connected with a lip seal (406).
5. The leak-proof sealing structure for a coal mine gas extraction pipe as described in claim 4, characterized in that: The surface of the grease injection nozzle (402) is fixedly connected to the surface of the threaded sleeve (303), and the grease injection hole (403) penetrates the grease injection nozzle (402) to the inner wall of the grease injection ring groove (404).
6. The leak-proof sealing structure for a coal mine gas extraction pipe as described in claim 4, characterized in that: The grease injection groove (404) is located at the position where the O-ring (405) is set.
7. The leak-proof sealing structure for a coal mine gas extraction pipe as described in claim 4, characterized in that: The inner wall of the lip seal (406) is provided with a groove.