Coal bed gas sampling device

Abstract

The coal bed gas sampling device comprises a shell, a gas pump and a gas storage tank, and the interior of the shell is divided into a gas pump cavity and a plurality of gas tank mounting cavities through a plurality of circular partition plates; the air pump cavity is communicated with the outside of the shell, the air pump is mounted in the air pump cavity, and an air outlet pipe on the air pump is connected with each air tank mounting cavity in parallel; a mounting plate is arranged in the gas tank mounting cavity, a connector is arranged on the mounting plate, the connector is communicated with the gas outlet pipe, an internal thread is arranged in the connector, and one end of the gas storage tank extends into the gas tank mounting cavity and is connected with the connector through the thread; and a piston plate is arranged in the air storage tank. The piston plate capable of sliding is arranged in the gas storage tank, air in the gas storage tank can be completely exhausted before gas storage, the air is prevented from being mixed into coal bed gas, the sampling analysis accuracy is improved, the gas tank mounting cavities are formed in the shell, the gas tank mounting cavities can be mounted, and coal beds with different depths can be sampled conveniently.

Description

Technical Field

[0001] This application relates to the field of coalbed methane resource exploration technology, and in particular to a coalbed methane sampling device. Background Technology

[0002] In my country's primary energy consumption structure, coal accounts for 59%, oil for 18.9%, and natural gas for only 7.8%. The proportion of natural gas consumption is far below the world average of nearly 24%. With the adjustment of our energy structure, the demand for natural gas will continue to grow rapidly. my country uses a significant amount of coalbed methane resources, and its development and utilization are of great importance to ensuring energy security. Coalbed methane is a gaseous resource associated with and coexisting with coal; it refers to hydrocarbon gases stored in coal seams, with methane as the main component, and belongs to unconventional natural gas. Before coalbed methane extraction, coalbed methane sampling and analysis are required. For example, Chinese patent application number 201922158690.4 discloses a coalbed methane sampling device, including a sampling box. Several gas collection boxes are fixedly installed on one side inside the sampling box. A partition is fixedly installed inside the sampling box and below the gas collection boxes. A fan is fixedly installed at the bottom of the partition. An air intake pipe is fixedly installed at the input end of the fan. A vent hole is drilled at the bottom of the sampling box. The air intake pipe is fixedly connected to the vent hole. An air intake bucket is fixedly installed at the bottom of the sampling box and below the vent hole. A main gas delivery pipe is fixedly installed at the output end of the fan. The main gas delivery pipe passes through the partition and has several branch gas delivery pipes fixedly installed on it. After the device descends to the predetermined sampling point, it uses a blower to pump the coalbed methane into different gas collection boxes. However, the gas collection boxes already contain air, and directly feeding the gas into the gas collection boxes will not remove the air completely, which can easily affect the analysis of the coalbed methane. Therefore, a coalbed methane sampling device is needed, whose internal gas storage tank is equipped with a piston, which can remove the air in the tank before storing the gas, thus preventing air from mixing into the coalbed methane and improving the accuracy of sampling and analysis. Utility Model Content

[0003] To address the aforementioned issues, this application proposes a coalbed methane sampling device, in which an internal gas storage tank is equipped with a piston. Before gas storage, the air inside the tank can be purged to prevent air from mixing into the coalbed methane and improve the accuracy of sampling and analysis.

[0004] This application is achieved through the following technical solution:

[0005] This application discloses a coalbed methane sampling device, comprising: a shell, an air pump, and a gas storage tank. The shell is internally divided into an air pump chamber and multiple gas tank mounting chambers by multiple circular partitions. The air pump chamber is connected to the outside of the shell. The air pump is installed in the air pump chamber, and the air outlet pipe on the air pump is connected in parallel to each gas tank mounting chamber. An mounting plate is provided in each gas tank mounting chamber. A connector is provided on the mounting plate, which is connected to the air outlet pipe. The connector has an internal thread. One end of the gas storage tank extends into the gas tank mounting chamber and is connected to the connector through the thread. A piston plate is provided inside the gas storage tank.

[0006] Furthermore, the piston plate is installed inside the gas storage tank, and a sealing ring is provided between the outer periphery of the piston plate and the inner wall of the gas storage tank.

[0007] Furthermore, the gas storage tank opening is provided with a one-way valve plate and a bracket. The bracket is connected to the inner wall of the gas storage tank, and the one-way valve plate is connected to the bracket via a connecting rod. The one-way valve plate blocks the gas storage tank opening, and a spring is provided between the connecting rod and the bracket.

[0008] Furthermore, a solenoid valve is provided between the connector and the air outlet pipe.

[0009] Furthermore, a conical partition is provided at the lower part of the air pump chamber, and an opening is provided at the lower part of the conical partition, with a filter screen provided at the opening. A storage battery is installed inside the air pump chamber.

[0010] Furthermore, it also includes a plug body, which is connected to the connector via threads.

[0011] The beneficial effects of this application are as follows: by setting a sliding piston plate in the gas storage tank, the air in the gas storage tank can be purged before gas storage, avoiding air mixing into the coalbed methane, thus improving the accuracy of sampling and analysis. In addition, the outer shell is provided with multiple gas tank installation cavities, which can accommodate multiple gas tank installation cavities, making it convenient to sample coal seams at different depths. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the structure of the gas storage tank of this utility model;

[0014] Figure 3 This is a schematic diagram of the structure of the gas storage tank opening of this utility model;

[0015] In the diagram: 1-outer shell, 2-air pump, 3-air tank, 4-circular partition, 5-air pump chamber, 6-air tank mounting chamber, 7-air outlet pipe, 8-mounting plate, 9-connector, 10-piston plate, 11-sealing ring, 12-one-way valve plate, 13-bracket, 14-connecting rod, 15-spring, 16-solenoid valve, 17-conical partition, 18-battery, 19-plug. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Throughout the description, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0017] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0018] Furthermore, the descriptions using "first," "second," etc., in this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of the stated features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0019] like Figures 1 to 3 As shown, an embodiment of this utility model provides a coalbed methane sampling device, including: a shell 1, an air pump 2, and a gas storage tank 3. The shell 1 is divided into an air pump chamber 5 and multiple gas tank mounting chambers 6 by multiple circular partitions 4. The air pump chamber 5 is connected to the outside of the shell 1. The air pump 2 is installed in the air pump chamber 5, and the air outlet pipe 7 on the air pump 2 is connected in parallel with each gas tank mounting chamber 6. The gas tank mounting chamber 6 is provided with a mounting plate 8, and the mounting plate 8 is provided with a connector 9. The connector 9 is connected to the air outlet pipe 7 and has an internal thread. One end of the gas storage tank 3 extends into the gas tank mounting chamber 6 and is connected to the connector 9 by the thread. The gas storage tank 3 is provided with a piston plate 10.

[0020] The outer casing 1 has a connecting ring on its upper part, which can be connected to a rope. It is then lowered into the detection hole of the coal seam. After descending to a predetermined depth, the air pump 2 is started remotely, and the corresponding solenoid valve 16 is opened simultaneously. At this time, the air pump 2 draws coalbed methane and injects it into the gas storage tank 3. As the coalbed methane enters, the piston plate 10 is gradually pushed open under air pressure, allowing the coalbed methane to fill the gas storage tank 3. The air on the right side of the piston plate 10 is discharged through the through hole to facilitate smooth sliding of the piston plate 10. After the left side of the piston plate 10 is filled, the air pump 2 is stopped and the solenoid valve 16 is closed, completing the sampling of this coal seam. The descent continues to sample coal seams at other depths, achieving the purpose of sampling coal seams at different depths. Before storing gas in the gas storage tank 3, the air inside the tank can be purged through the piston plate 10 to prevent air from mixing with the coalbed methane, thus improving the accuracy of sampling and analysis.

[0021] After sampling is completed, pull out the sampling device, then rotate the gas storage tank 3 to remove the gas storage tank 3 from the outer shell 1. At this time, the gas storage tank 3 is blocked by the one-way valve plate 12 to prevent coalbed methane leakage, making it easier to send the coalbed methane into professional equipment for analysis.

[0022] Preferably, the piston plate 10 is installed inside the gas storage tank 3, and a sealing ring 11 is provided between the outer periphery of the piston plate 10 and the inner wall of the gas storage tank 3 to prevent gas from seeping between the piston plate 10 and the inner wall of the gas storage tank 3, thereby improving the airtightness of the gas storage tank 3. Before sampling, the piston plate 10 is pushed to the far left to purge the air in the gas storage tank 3 and avoid air affecting the analysis results of coalbed methane.

[0023] Preferably, the gas storage tank 3 has a one-way valve plate 12 and a bracket 13 at its opening. The bracket 13 is connected to the inner wall of the gas storage tank 3, and the one-way valve plate 12 is connected to the bracket 13 via a connecting rod 14. The one-way valve plate 12 blocks the opening of the gas storage tank 3, and a spring 15 is provided between the connecting rod 14 and the bracket 13. In its natural state, the spring 15 pushes the connecting rod 14, causing the one-way valve plate 12 to fit against the opening of the gas storage tank 3. At this time, gas can only flow into the gas storage tank 3 and cannot be discharged from it. When venting or removing gas from the gas storage tank 3, the connecting rod 14 is gently pressed by hand to create a gap between the one-way valve plate 12 and the opening of the gas storage tank 3, allowing air to flow out of the gas storage tank 3.

[0024] Preferably, a solenoid valve 16 is provided between the connector 9 and the gas outlet pipe 7 to facilitate the control of gas flow into different gas storage tanks 3.

[0025] In a preferred embodiment, a conical partition 17 is provided at the lower part of the air pump chamber 5. The conical partition 17 can increase the internal space of the air pump chamber 5, making it easier to install the air pump 2. The lower part of the conical partition 17 is provided with an opening and a filter screen is provided at the opening to avoid dust inhalation during air sampling. A storage battery 18 is installed inside the air pump chamber 5 to provide power to the air pump 2 and the solenoid valve 16 so that they can work normally.

[0026] In a preferred embodiment, a plug body 19 is also included. The plug body 19 is connected to the connector 9 by threads. For the gas tank installation cavity 6 where the gas tank 3 is not installed, the plug body 19 can be used to block it to prevent air leakage and dust contamination of the connector 9, and to ensure the airtightness of the connector 9.

[0027] Of course, this application may have many other implementation methods. Based on this implementation method, other implementation methods obtained by those skilled in the art without any creative effort are all within the scope of protection of this application.

Claims

1. A coalbed methane sampling device, characterized in that, include: The system comprises an outer shell (1), an air pump (2), and an air tank (3). The outer shell (1) is divided into an air pump chamber (5) and multiple air tank mounting chambers (6) by multiple circular partitions (4). The air pump chamber (5) is connected to the outside of the outer shell (1). The air pump (2) is installed in the air pump chamber (5). The air outlet pipe (7) on the air pump (2) is connected in parallel with each air tank mounting chamber (6). The air tank mounting chamber (6) is provided with a mounting plate (8). The mounting plate (8) is provided with a connector (9). The connector (9) is connected to the air outlet pipe (7). The connector (9) is provided with an internal thread. One end of the air tank (3) extends into the air tank mounting chamber (6) and is connected to the connector (9) through the thread. The air tank (3) is provided with a piston plate (10).

2. The coalbed methane sampling device according to claim 1, characterized in that, The piston plate (10) is installed inside the gas storage tank (3), and a sealing ring (11) is provided between the outer periphery of the piston plate (10) and the inner wall of the gas storage tank (3).

3. The coalbed methane sampling device according to claim 1, characterized in that, The gas storage tank (3) is provided with a one-way valve plate (12) and a bracket (13) at the opening. The bracket (13) is connected to the inner wall of the gas storage tank (3). The one-way valve plate (12) is connected to the bracket (13) through a connecting rod (14). The one-way valve plate (12) blocks the opening of the gas storage tank (3), and a spring (15) is provided between the connecting rod (14) and the bracket (13).

4. The coalbed methane sampling device according to claim 1, characterized in that, A solenoid valve (16) is provided between the connector (9) and the air outlet pipe (7).

5. A coalbed methane sampling device according to claim 1, characterized in that, The lower part of the air pump chamber (5) is provided with a conical partition (17), the lower part of the conical partition (17) is provided with an opening, and a filter screen is provided at the opening. A storage battery (18) is installed inside the air pump chamber (5).

6. A coalbed methane sampling device according to claim 1, characterized in that, It also includes a plug (19), which is connected to the connector (9) by threads.

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