Filtering device for coal mine underground gas drainage

Abstract

The utility model relates to the technical field of gas drainage filtering, and discloses a coal mine underground gas drainage filtering device which comprises a filtering cylinder, a gas guide assembly and filtering pieces, a plurality of annularly-distributed mounting grooves are formed in the filtering cylinder, a detachable filtering piece is fixedly mounted in each mounting groove, and the gas guide assembly is fixedly connected with the filtering pieces. Air guide assemblies are arranged at the two ends of the filter cartridge, each air guide assembly comprises an air guide header pipe, an air distribution disc connected to one end of the air guide header pipe and a plurality of air guide branch pipes annularly distributed on the other side of the air distribution disc, each air guide branch pipe communicates with the corresponding mounting groove, and an electromagnetic valve is mounted on each air guide branch pipe. By arranging the filter cartridge, the gas guide assembly and the filter piece, when the filter piece needs to be cleaned, shutdown operation is not needed, and the gas drainage efficiency cannot be affected.

Description

Technical Field

[0001] This utility model relates to the field of gas drainage and filtration technology, and in particular to a filtration device for underground gas drainage in coal mines. Background Technology

[0002] Methane gas is a non-toxic, odorless, and colorless flammable and explosive gas, an unconventional natural gas produced from coal seams with methane as its main component. Its extraction is of great significance for reducing coal mine gas explosions, expanding natural gas supply, and reducing environmental pollution. During the process of methane drainage in coal mines, some coal slag is easily extracted along with the gas; therefore, filtration devices are needed to filter the coal slag from the methane gas during drainage.

[0003] The existing Chinese patent with publication number CN215906162U discloses a coal mine gas extraction and slag removal filtration device, including a gas extraction and slag removal device body. The gas extraction and slag removal device body includes a first connecting pipe and a second connecting pipe. A gas inlet is provided on the top side of the first connecting pipe away from the second connecting pipe, and a gas outlet is provided on the bottom side of the second connecting pipe close to the first connecting pipe. The bottom of the gas outlet is connected to a gas collection box. The first connecting pipe and the second connecting pipe are provided with a filter structure that can effectively improve the filtration effect.

[0004] Regarding the aforementioned technologies, the inventors have discovered at least the following problems: In order to avoid clogging of the filter structure (filter screen), the existing filter devices of this type require periodic shutdown to disassemble the filter structure (filter screen) and clean the filtered coal slag. During the cleaning process, the entire system stops working, which will affect the gas extraction efficiency.

[0005] Therefore, how to design a filtration device for underground gas drainage in coal mines has become a problem that we need to solve. Utility Model Content

[0006] This utility model addresses the shortcomings of existing technologies by providing the following technical solution: a filter device for underground gas drainage in coal mines, comprising a filter cylinder, a gas guiding component, and a filter element. The filter cylinder has multiple annularly distributed mounting slots inside, and a detachable filter element is fixedly installed inside each mounting slot. Gas guiding components are provided at both ends of the filter cylinder.

[0007] The air guiding assembly includes a main air guiding pipe, an air distribution plate connected to one end of the main air guiding pipe, and a plurality of air guiding branch pipes distributed in a ring on the other side of the air distribution plate. Each air guiding branch pipe is connected to a corresponding mounting slot, and each air guiding branch pipe is equipped with a solenoid valve.

[0008] As an improvement to the above technical solution, rubber sealing rings are fixedly connected to the inner walls at both ends of the mounting groove.

[0009] As an improvement to the above technical solution, an arc-shaped pressure plate is fixedly installed on the outer wall of each end of the filter cylinder at both ends of the mounting groove, and the arc-shaped pressure plate abuts against the outside of the filter element.

[0010] As an improvement to the above technical solution, both ends of the arc-shaped pressure plate are threaded with first bolts, and the arc-shaped pressure plate is fixedly installed on the outer wall of the filter cylinder by the first bolts.

[0011] As an improvement to the above technical solution, the filter element includes two symmetrically distributed shells with a channel reserved between the two shells. Multiple filter screens are arranged at intervals in the channel, and the pore size of the multiple filter screens gradually decreases along the airflow direction.

[0012] As an improvement to the above technical solution, both ends of the housing are threaded with second bolts, and the two housings are fixedly installed by the second bolts.

[0013] As an improvement to the above technical solution, the inner wall of the channel is provided with an arc-shaped groove, and the filter screen is snapped into the arc-shaped groove.

[0014] The beneficial effects of this utility model are:

[0015] This utility model, by setting up a filter cylinder, a gas guiding assembly, and filter elements, allows for the following operation: First, based on the actual needs of gas extraction, the solenoid valves of 1-3 gas guiding branches of the gas guiding assembly are opened, while the solenoid valves of the other gas guiding branches are closed. Gas enters the gas distribution plate from the main gas guiding pipe at one end of the filter cylinder, then enters the gas guiding branches with the solenoid valves opened, and then enters the corresponding installation slots. The filter elements in the installation slots filter the coal slag in the gas. The filtered gas is then discharged through the gas guiding assembly at the other end of the filter cylinder. When the filter elements need to be cleaned, the solenoid valve of the gas guiding branch corresponding to the filter element can be closed, while the solenoid valves of the other closed gas guiding branches can be opened, keeping the number of working gas guiding branches unchanged. At this time, the filter elements corresponding to the closed gas guiding branches can be disassembled and cleaned without stopping the machine and without affecting the gas extraction efficiency.

[0016] This invention utilizes a filter element. When gas enters the installation slot through the gas guide pipe, it passes through the channel. Multiple filters in the channel perform multiple filtrations on the coal slag in the gas. The filters with different pore sizes intercept coal slag of different sizes, dispersing the coal slag in different positions within the channel. This reduces the filtration load on the filters. When it is necessary to clean the coal slag in the channel, the second bolt can be loosened to separate the two housings, allowing the coal slag and filters to be removed. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the disassembly structure of the filter element of this utility model;

[0019] Figure 3 This is a schematic diagram of the disassembly structure of the filter screen of this utility model;

[0020] Figure 4 This is a schematic diagram of the truncated structure of this utility model.

[0021] Reference numerals: 1. Filter cartridge; 11. Mounting groove; 12. Rubber sealing ring; 13. Arc-shaped pressure plate; 14. First bolt; 2. Air guide assembly; 21. Main air guide pipe; 22. Air distribution plate; 23. Branch air guide pipe; 24. Solenoid valve; 3. Filter element; 31. Housing; 32. Channel; 33. Filter screen; 34. Second bolt; 35. Arc-shaped groove. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the following provides a more detailed description of the utility model. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the utility model.

[0023] like Figure 1-4As shown, this utility model provides a technical solution: a filter device for underground gas drainage in coal mines, including a filter cylinder 1, a gas guiding assembly 2, and a filter element 3. The filter cylinder 1 has multiple annularly distributed mounting slots 11 inside, with at least six slots. Each mounting slot 11 has a detachable filter element 3 fixedly installed inside. Gas guiding assemblies 2 are provided at both ends of the filter cylinder 1. Each gas guiding assembly 2 includes a main gas guiding pipe 21, a gas distribution plate 22 connected to one end of the main gas guiding pipe 21, and multiple gas guiding branch pipes 23 annularly distributed on the other side of the gas distribution plate 22. Each gas guiding branch pipe 23 is connected to a corresponding mounting slot 11, and each gas guiding branch pipe 23 is equipped with a solenoid valve 24. Through the arrangement of the filter cylinder 1, gas guiding assembly 2, and filter element 3, during use, according to the actual needs of gas drainage, one to three gas guiding pipes of the gas guiding assembly 2 are first... When the solenoid valve 24 of branch pipe 23 is opened, the solenoid valves 24 of the other branch pipes 23 of the gas guiding assembly 2 are closed. Gas enters the gas distribution plate 22 from the main gas guiding pipe 21 at one end of the filter cylinder 1, and then enters the branch pipes 23 with the solenoid valve 24 opened. From the branch pipes 23, the gas enters the corresponding installation groove 11. The filter element 3 in the installation groove 11 filters the coal slag in the gas. The filtered gas is discharged through the gas guiding assembly 2 at the other end of the filter cylinder 1. When the filter element 3 needs to be cleaned, the solenoid valve 24 of the branch pipe 23 corresponding to the filter element 3 can be closed, and the solenoid valves 24 of the other closed branch pipes 23 can be opened, so that the number of working branch pipes 23 remains unchanged. At this time, the filter element 3 corresponding to the branch pipe 23 with the solenoid valve 24 closed can be disassembled and cleaned without stopping the machine and without affecting the gas extraction efficiency.

[0024] Specifically, rubber sealing rings 12 are fixedly connected to the inner walls of both ends of the mounting groove 11. Arc-shaped pressure plates 13 are fixedly installed on the outer walls of both ends of the filter cylinder 1 in each mounting groove 11. The arc-shaped pressure plates 13 are pressed against the outside of the filter element 3. The two ends of the arc-shaped pressure plates 13 are threaded with first bolts 14. The arc-shaped pressure plates 13 are fixedly installed on the outer wall of the filter cylinder 1 by the first bolts 14. With the setting of rubber sealing rings 12, arc-shaped pressure plates 13 and first bolts 14, when installing the filter element 3, the filter element 3 is inserted into the mounting groove 11, and the two ends of the filter element 3 are pressed against the rubber sealing rings 12 for sealing. Then the arc-shaped pressure plates 13 are pressed on the two ends of the filter element 3 and fixed with the first bolts 14. When disassembling the filter element 3, the first bolts 14 can be loosened to remove the arc-shaped pressure plates 13. Then the filter element 3 can be removed. The outer surface of the filter element 3 can be provided with pull rods, pull rings, pull ropes or pull grooves to facilitate the removal of the filter element 3.

[0025] Specifically, the filter element 3 includes two symmetrically distributed housings 31. Both ends of the housings 31 are threaded with second bolts 34, and the two housings 31 are fixedly installed by the second bolts 34. A channel 32 is reserved between the two housings 31. Multiple filter screens 33 are arranged at intervals in the channel 32. The pore size of the multiple filter screens 33 gradually decreases along the airflow direction. With the arrangement of the filter element 3, when the gas enters the installation groove 11 through the gas guide branch pipe 23, the gas will pass through the channel 32. The multiple filter screens 33 in the channel 32 will perform multiple filtrations on the coal slag in the gas, so that the filter screens 33 with different pore sizes intercept coal slag of different sizes, so that the coal slag is dispersed in different positions in the channel 32, which can alleviate the filtration load of the filter screens 33. When it is necessary to clean the coal slag in the channel 32, the second bolts 34 can be loosened to separate the two housings 31, and the coal slag and filter screens 33 in the channel 32 can be taken out.

[0026] Furthermore, the inner wall of the channel 32 is provided with an arc-shaped groove 35, and the filter screen 33 is snapped into the arc-shaped groove 35. Through the setting of the arc-shaped groove 35, when the filter screen 33 is installed, the filter screen 33 will be snapped into the arc-shaped groove 35, which can play a limiting and fixing role for the filter screen 33.

[0027] The implementation principle of this utility model is as follows: By setting up a filter cylinder 1, a gas guiding assembly 2, and a filter element 3, in use, firstly, according to the actual needs of gas extraction, the solenoid valves 24 of 1-3 gas guiding branch pipes 23 of the gas guiding assembly 2 are opened, while the solenoid valves 24 of the other gas guiding branch pipes 23 of the gas guiding assembly 2 are closed. Gas enters the gas distribution plate 22 from the gas guiding main pipe 21 at one end of the filter cylinder 1, and then enters the gas guiding branch pipes 23 with the solenoid valves 24 opened respectively. Then, it enters the corresponding mounting groove 11 from the gas guiding branch pipes 23, and passes through the mounting groove 1. The filter element 3 inside the filter cylinder 1 filters the coal slag in the gas. The filtered gas is discharged through the gas guide assembly 2 at the other end of the filter cylinder 1. When it is necessary to clean the filter element 3, the solenoid valve 24 of the gas guide branch pipe 23 corresponding to the filter element 3 can be closed, and the solenoid valve 24 of the other closed gas guide branch pipes 23 can be opened to keep the number of working gas guide branch pipes 23 unchanged. At this time, the filter element 3 corresponding to the gas guide branch pipe 23 with the solenoid valve 24 closed can be disassembled and cleaned without stopping the machine and without affecting the gas extraction efficiency.

[0028] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A filtering device for coal mine underground gas drainage, comprising a filter cylinder (1), a gas guide assembly (2) and a filter element (3), characterized in that: The filter cylinder (1) has multiple annularly distributed mounting slots (11) inside, and each mounting slot (11) has a detachable filter element (3) fixedly installed inside. Both ends of the filter cylinder (1) are provided with air guiding components (2). The air guiding assembly (2) includes an air guiding main pipe (21), an air distribution plate (22) connected to one end of the air guiding main pipe (21), and a plurality of air guiding branch pipes (23) distributed in a ring on the other side of the air distribution plate (22). Each air guiding branch pipe (23) is connected to a corresponding mounting slot (11), and each air guiding branch pipe (23) is equipped with a solenoid valve (24).

2. The filtering device for coal mine underground gas drainage according to claim 1, characterized in that: Rubber sealing rings (12) are fixedly connected to the inner walls at both ends of the mounting groove (11).

3. The filtering device for coal mine underground gas drainage according to claim 1, characterized in that: The filter cylinder (1) is fixedly installed with an arc-shaped pressure plate (13) on the outer wall at both ends of each mounting groove (11), and the arc-shaped pressure plate (13) abuts against the outside of the filter element (3).

4. The filtering device for coal mine underground gas drainage according to claim 3, characterized in that: Both ends of the arc-shaped pressure plate (13) are threaded with first bolts (14), and the arc-shaped pressure plate (13) is fixedly installed on the outer wall of the filter cylinder (1) by the first bolts (14).

5. The filtering device for coal mine underground gas drainage according to claim 1, characterized in that: The filter element (3) includes two symmetrically distributed shells (31), with a channel (32) reserved between the two shells (31). Multiple filter screens (33) are spaced apart in the channel (32), and the pore size of the multiple filter screens (33) gradually decreases along the airflow direction.

6. The filtering device for coal mine underground gas drainage according to claim 5, characterized in that: Both ends of the housing (31) are threaded with second bolts (34), and the two housings (31) are fixedly installed by the second bolts (34).

7. The filtering device for coal mine gas drainage according to claim 5, characterized in that: The inner wall of the channel (32) is provided with an arc-shaped groove (35), and the filter (33) is engaged in the arc-shaped groove (35).

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