Gas extraction metering sensor and gas extraction metering system

Abstract

The utility model discloses a gas extraction metering sensor and a gas extraction metering system, and relates to the technical field of gas extraction. The gas extraction metering sensor comprises an outer pipe, an inner pipe, a filling layer, a connecting pipe and a flow velocity measurer. The outer pipe is used for butt joint with a gas pipeline, and the inner pipe is arranged in the outer pipe. The gap between the outer pipe and the inner pipe is filled with the filling layer so that gas can be forced to flow through the inner pipe. The two ends of the connecting pipe are connected with the outer pipe and the inner pipe respectively to provide a connecting channel for the inner side of the inner pipe and the outer side of the outer pipe. The flow velocity measurer comprises a measuring end, a measuring head and a detection module. The two measuring ends penetrate through the measuring head and are connected with the detection module through air pipes. The measuring head is hermetically connected with the connecting pipe, and the measuring end extends into the inner pipe. Compared with the prior art, the technical scheme provided by the utility model can realize accurate measurement of the gas flow velocity.

Description

Technical Field

[0001] This utility model relates to the field of gas extraction technology, and in particular to a gas extraction metering sensor and a gas extraction metering system. Background Technology

[0002] Pre-drilling extraction is the most important measure for gas control in high-risk mines. Accurate measurement and testing of the gas extraction volume from each borehole is a crucial means of monitoring the quality of extraction work and evaluating the effectiveness of gas control.

[0003] However, the diameter of gas extraction pipelines is generally 50-75mm or even larger. When the gas flow rate is small, the gas velocity is slow and it is not easy to detect the gas velocity. Utility Model Content

[0004] The purpose of this invention is to provide a gas extraction metering sensor and a gas extraction metering system to solve the problems existing in the above-mentioned related technologies and to achieve accurate measurement of gas flow velocity.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model discloses a gas extraction metering sensor, comprising:

[0007] The outer pipe is used to connect to the gas pipeline;

[0008] The inner tube is disposed inside the outer tube;

[0009] A filling layer fills the gap between the outer tube and the inner tube to force the gas to flow through the inner tube;

[0010] A connecting pipe, with its two ends connected to the outer pipe and the inner pipe respectively, to provide a connection channel between the inner side of the inner pipe and the outer side of the outer pipe;

[0011] A flow rate measuring device includes measuring ends, a measuring head, and a detection module; two measuring ends pass through the measuring head and are connected to the detection module via air tubes; the measuring head is sealed to the connecting tube, and the measuring ends extend into the inner tube.

[0012] Preferably, both the outer tube and the inner tube are cylindrical tubes and are arranged concentrically.

[0013] Preferably, the measuring head is threadedly connected to the connecting pipe, and a sealing ring is provided between the measuring head and the connecting pipe.

[0014] Preferably, the filling layer is made of plastic foam.

[0015] Preferably, the filling layer extends from one end of the inner tube to the other end of the inner tube.

[0016] Preferably, the outer diameter of the outer tube is 50-75 mm.

[0017] Preferably, the outer diameter of the inner tube is 10-20 mm, and the length of the inner tube is 200-300 mm.

[0018] This utility model also discloses a gas extraction and metering system, including multiple gas extraction and metering sensors as described above, as well as a solenoid valve and a main unit. The main unit includes a chassis and a control module installed inside the chassis. Multiple flow rate measuring devices share a single detection module. The measuring heads of the multiple flow rate measuring devices are connected in parallel to the air inlet of the solenoid valve, and the air outlet of the solenoid valve is connected to the detection module, so that the solenoid valve can adjust the measuring object of the detection module. The detection module and the solenoid valve are both installed inside the chassis and are electrically connected to the control module.

[0019] This utility model also discloses a gas extraction and metering system, including multiple gas extraction and metering sensors as described above, and a host computer; the flow rate measuring device also includes a communication module, which is used to realize the communication connection between the host computer and the detection module.

[0020] Preferably, the communication module is connected to the host via a cable, which is used for signal transmission and power supply.

[0021] This utility model achieves the following technical advantages compared to related technologies:

[0022] The gas extraction and metering sensor provided by this invention features an outer tube for easy connection and installation with gas pipelines, improving installation efficiency. By incorporating a filling layer, a sudden change in the gas flow area is achieved, forcing gas into the inner tube. This increases the flow velocity by reducing the flow area, reaching the lower limit for velocity measurement by the velocity meter. Compared to a single tapered tube with a gradually decreasing flow area, this invention avoids the complex processing and transportation of tapered tube sections through the filling layer, which is easy to install, thus effectively reducing costs.

[0023] This utility model provides a gas extraction and metering system that reduces the layout cost of detection modules by allowing multiple flow rate measuring devices to share a single detection module. The control module, detection module, and solenoid valve are all located close together within the chassis, thus shortening the length of their connecting cables. Furthermore, placing the detection module within the chassis, away from the gas pipeline, improves safety.

[0024] This utility model provides another gas extraction and metering system, which enables the detection module to transmit detection data to the host through the communication module. This allows the detection module to be deployed near the corresponding gas pipeline, thereby reducing the pressure loss of gas in the pipeline and improving the detection accuracy of the detection module. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the embodiments 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 creative effort.

[0026] Figure 1 This is a schematic diagram of a gas extraction metering sensor according to Embodiment 1 of this utility model;

[0027] Figure 2 This is a schematic diagram of the gas extraction and metering system according to Embodiment 2 of this utility model;

[0028] Figure 3 This is a schematic diagram of the gas extraction and metering system according to Embodiment 3 of this utility model;

[0029] Figure 4 This is a schematic diagram showing the installation position of the gas extraction metering sensor according to Embodiment 1 of this utility model;

[0030] Figure 5 This is a schematic diagram combining the detection methods of Example 2 and Example 3.

[0031] In the diagram: 1-Outer pipe; 2-Inner pipe; 3-Filling layer; 4-Connecting pipe; 5-Sealing ring; 6-Measuring end; 7-Measuring head; 8-Detection module; 9-Gas pipe; 10-Solenoid valve; 11-Main unit; 12-Chassis; 13-Control module; 14-Cable; 15-Communication module; 16-Gas pipeline. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] The purpose of this invention is to provide a gas extraction metering sensor and a gas extraction metering system to solve the problems existing in the above-mentioned related technologies and to achieve accurate measurement of gas flow velocity.

[0034] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] Reference Figure 1 , Figure 4 This embodiment provides a gas extraction metering sensor, including an outer tube 1, an inner tube 2, a filling layer 3, a connecting tube 4, and a flow rate measuring device.

[0037] The outer pipe 1 is used to connect to the gas pipeline 16, and the inner pipe 2 is installed inside the outer pipe 1. The filling layer 3 fills the gap between the outer pipe 1 and the inner pipe 2 to force the gas to flow through the inner pipe 2. The two ends of the connecting pipe 4 are connected to the outer pipe 1 and the inner pipe 2 respectively to provide a connection channel between the inside of the inner pipe 2 and the outside of the outer pipe 1. The flow rate measuring device includes measuring ends 6, measuring heads 7, and a detection module 8. The two measuring ends 6 pass through the measuring heads 7 and are connected to the detection module 8 through the gas pipes 9. The measuring heads 7 are sealed to the connecting pipe 4, and the measuring ends 6 extend into the inner pipe 2.

[0038] The working principle of the gas extraction metering sensor in this embodiment is as follows:

[0039] The dimensions of the end of the outer pipe 1 are generally similar to those of the end of the gas pipe 16 to facilitate their connection. After the gas flows into the outer pipe 1 from the gas pipe 16, it can only flow in the inner pipe 2 due to the obstruction of the filling layer 3. Since the inner pipe 2 is located inside the outer pipe 1, the flow area of ​​the inner pipe 2 is obviously smaller than that of the outer pipe 1, thus increasing the flow velocity while keeping the flow rate constant.

[0040] The flow velocity meter, also known as a Pitot tube meter, works by measuring the pressure difference between two measuring ends 6 using the detection module 8. Utilizing the correlation between pressure difference and flow velocity, the pressure difference data is converted into flow velocity data. The diameter of the gas pipeline 16 is typically 50–75 mm, or even larger. When the gas flow rate is low, the gas velocity is slow. Due to the limited accuracy of the flow velocity meter, it is difficult to detect the gas velocity when it is too low.

[0041] In this embodiment, the outer pipe 1 is designed to facilitate connection and installation with the gas pipeline 16, thereby improving installation efficiency. By setting the filling layer 3, a sudden change in the gas flow area is achieved, forcing the gas to flow into the inner pipe 2. This increases the flow velocity by reducing the flow area, thus reaching the lower limit of the flow velocity measurement by the flow velocity meter.

[0042] Compared to a single tapered tube with a gradually decreasing flow area, this embodiment avoids the complex processing and transportation of tapered tube sections by setting the filling layer 3. The filling layer 3 is easy to fill, thereby effectively reducing costs.

[0043] As a possible example, in this embodiment, both the outer tube 1 and the inner tube 2 are cylindrical tubes and are arranged concentrically. The cylindrical tube structure is easy to process and transport. Compared with a single tapered tube with a gradually decreasing flow area, although the number of tubes increases, the simple structure of the tubes can still reduce processing and transportation costs.

[0044] As a possible example, in this embodiment, the measuring head 7 is threadedly connected to the connecting pipe 4, and a sealing ring 5 is provided between the measuring head 7 and the connecting pipe 4. The clamping force provided by the threaded connection compresses the sealing ring 5, thereby improving the sealing performance between the measuring head 7 and the connecting pipe 4 and preventing gas leakage.

[0045] However, the actual implementation is not limited to this. For example, the measuring head 7 can also be fixed in other ways, such as by screws to the end of the connecting tube 4.

[0046] As a possible example, in this embodiment, the filling layer 3 is made of plastic foam. Plastic foam is lightweight, will not place an excessive load on the pipeline support structure, and is easy to fill and inexpensive.

[0047] For example, the filling layer 3 can be fixed to the inner tube 2 or the outer tube 1 by adhesive bonding, or the end of the filling layer 3 located downstream of the gas flow can be positioned by a positioning element (e.g., a baffle) to prevent the filling layer 3 from drifting downstream with the gas flow.

[0048] For example, the plastic foam is flame-retardant foam, or is mixed with flame-retardant media to achieve a flame-retardant effect.

[0049] As a possible example, in this embodiment, the filling layer 3 extends from one end of the inner tube 2 to the other end of the inner tube 2, and the inner tube 2 preferably extends from one end of the outer tube 1 to the other end.

[0050] By increasing the length of the filling layer 3, the blocking effect of the filling layer 3 on the gas flow is improved, so that the gas flow can pass through the inner pipe 2.

[0051] As a possible example, in this embodiment, the outer diameter of the outer pipe 1 is 50–75 mm. This diameter range is comparable to the commonly used size of the gas pipe 16, facilitating connection.

[0052] As a possible example, in this embodiment, the outer diameter of the inner tube 2 is 10-20 mm. Obviously, the outer diameter of the inner tube 2 is significantly smaller than the outer diameter of the outer tube 1, thereby maximizing the flow rate of gas in the inner tube 2.

[0053] As a possible example, in this embodiment, the length of the inner tube 2 is 200-300 mm. The length of the inner tube 2 is the maximum length of the filling layer 3. By increasing the length of the inner tube 2, the filling layer 3 can be laid out for a greater length, thereby improving the blocking effect of the filling layer 3 on the gas flow and allowing all the gas flow to pass through the inner tube 2.

[0054] Practical verification showed that when gas was directly detected in a 50mm outer diameter gas pipe 16, the minimum detected flow rate was 117.75 ml / min. Using the detection method of this embodiment, taking an inner pipe 2 with an outer diameter of 10mm as an example, the minimum detected flow rate was 4.71 ml / min, which is 25 times more accurate than existing detection methods; taking an inner pipe 2 with an outer diameter of 20mm as an example, the minimum detected flow rate was 18.84 ml / min, which is 6.25 times more accurate than existing detection methods. Therefore, the detection method of this embodiment significantly improves the detection accuracy of gas flow rate.

[0055] Example 2

[0056] Reference Figure 2 This embodiment provides a gas extraction and metering system, including multiple gas extraction and metering sensors as provided in Embodiment 1, as well as a solenoid valve 10 and a main unit 11. The main unit 11 includes a chassis 12 and a control module 13 installed within the chassis 12. Multiple flow rate measuring devices share a single detection module 8. The measuring heads 7 of the multiple flow rate measuring devices are connected in parallel to the air inlet of the solenoid valve 10, and the air outlet of the solenoid valve 10 is connected to the detection module 8, so that the solenoid valve 10 can adjust the measuring object of the detection module 8. Both the detection module 8 and the solenoid valve 10 are installed within the chassis 12 and are electrically connected to the control module 13.

[0057] It should be noted that there are a large number of gas pipelines 16 distributed at the gas drainage site. If gas drainage metering sensors are installed on only a single pipeline or a small number of pipelines, the overall drainage situation cannot be obtained.

[0058] This embodiment reduces the layout cost of the detection module 8 by allowing multiple flow rate measuring devices to share a single detection module 8. The control module 13, detection module 8, and solenoid valve 10 are all located close together within the housing 12, thus shortening the length of their connecting cables. Furthermore, placing the detection module 8 within the housing 12, away from the gas pipeline 16, improves safety.

[0059] When the gas extraction and metering system is working, the control module 13 sends a control signal to the solenoid valve 10 according to its own preset control program or according to the control command input by the staff in real time, so that the detection module 8 detects the gas flow velocity in the space where the measuring heads 7 of multiple flow velocity measuring devices are located in a certain order, thereby improving the degree of automation.

[0060] Example 3

[0061] Reference Figure 3 This embodiment provides a gas extraction and metering system, including multiple gas extraction and metering sensors as provided in Embodiment 1, and a host 11. The flow rate meter also includes a communication module 15, which is electrically connected to both the host 11 and the detection module 8 to enable communication between the host 11 and the detection module 8.

[0062] When the host 11 is far from the gas pipeline 16, the length of the gas pipe 9 used to transport gas between the detection module 8 and the measuring end 6 is large, resulting in a large pressure loss and affecting the detection accuracy of the detection module 8.

[0063] This embodiment does not adopt the installation method of embedding the detection module 8 in the chassis 12 as in Embodiment 2. Instead, the detection module 8 transmits the detection data to the host 11 through the communication module 15, so that the detection module 8 can be deployed near the corresponding gas pipeline 16, thereby reducing the pressure loss of gas in the gas pipe 9 and improving the detection accuracy of the detection module 8.

[0064] For example, the distance between the detection module 8 and the outer tube 1 is not less than 15 cm to improve safety.

[0065] As a possible example, in this embodiment, the communication module 15 is connected to the host 11 via a cable 14, which is used for signal transmission and power supply. It is understood that the communication module 15 and the host 11 can also transmit signals wirelessly, in which case a battery can be used to power the detection module 8 and the communication module 15.

[0066] It is understood that the technical solutions of Embodiment 2 and Embodiment 3 can be used in combination. For example, refer to... Figure 5 In embodiment 2, the main unit 11 has a detection module 8 and a solenoid valve 10 installed in its chassis 12 to detect gas in the inner pipe 2, which is closer to the main unit 11. At the same time, the main unit 11 is connected to the communication module 15 via a cable 14, and the communication module 15 is electrically connected to the corresponding detection module 8 to detect gas in the inner pipe 2, which is farther away from the main unit 11.

[0067] For example, when the distance between the host 11 and the inner pipe 2 is less than 30 meters, the gas in the inner pipe 2 can be detected using the method described in Embodiment 2; when the distance between the host 11 and the inner pipe 2 is not less than 30 meters, the gas in the inner pipe 2 can be detected using the method described in Embodiment 3. Depending on the actual needs, the 30 meters mentioned here can also be replaced with other lengths.

[0068] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A gas extraction metering sensor, characterized in that The utility model relates to a kind of gas extraction metering sensor, including: Outer tube (1) for docking gas pipeline; Inner tube (2) is arranged in the outer tube (1); Filler layer (3) fills the gap between the outer tube (1) and the inner tube (2) to force gas to flow from the inner tube (2); Connecting pipe (4) is connected to the outer tube (1) and the inner tube (2) respectively at both ends to provide a connection channel between the inside of the inner tube (2) and the outside of the outer tube (1); Flow rate measurer includes measuring end (6), measuring head (7) and detection module (8);Two measuring ends (6) pass through the measuring head (7) and are connected to the detection module (8) by air pipe (9);The measuring head (7) is sealingly connected to the connecting pipe (4), and the measuring end (6) extends into the inner tube (2).

2. The gas extraction metering sensor according to claim 1, characterized in that: The outer tube (1) and the inner tube (2) are both cylindrical tubes and are concentrically arranged.

3. The gas extraction metering sensor of claim 1, wherein: The measuring head (7) is threadedly connected to the connecting pipe (4), and a sealing ring (5) is arranged between the measuring head (7) and the connecting pipe (4).

4. The gas extraction metering sensor of claim 1, wherein: The filler layer (3) is made of plastic foam.

5. The gas extraction metering sensor of claim 1, wherein: The filler layer (3) extends from one end of the inner tube (2) to the other end of the inner tube (2).

6. The gas extraction metering sensor of claim 1, wherein: The outer diameter of the outer tube (1) is 50-75 mm.

7. The gas extraction metering sensor of claim 1, wherein: The outer diameter of the inner tube (2) is 10-20 mm, and the length of the inner tube (2) is 200-300 mm.

8. A gas extraction metering system, characterized in that The utility model relates to a kind of gas extraction metering sensor, including:

9. A gas extraction metering system, characterized in that A plurality of gas extraction metering sensors according to any one of claims 1-7 further include solenoid valve (10) and host computer (11), the host computer (11) includes cabinet (12) and control module (13) installed in the cabinet (12);Multiple flow rate measurers share one detection module (8);The measuring head (7) of multiple flow rate measurers is connected to the gas inlet of solenoid valve (10) in parallel, and the gas outlet of solenoid valve (10) is connected to the detection module (8), so that solenoid valve (10) can adjust the measurement object of the detection module (8);The detection module (8) and the solenoid valve (10) are both installed in the cabinet (12), and are both electrically connected to the control module (13).

10. The gas extraction metering system of claim 9, wherein: A plurality of gas extraction metering sensors according to any one of claims 1-7 further include host computer (11); The communication module (15) is connected to the host computer (11) through cable (14), and the cable (14) is used for signal transmission and power supply. The communication module (15) is connected to the host computer (11) through cable (14), and the cable (14) is used for signal transmission and power supply.

Images