Multi-parameter detection probe rod for gas extraction pipeline

Abstract

The invention discloses a multi-parameter detection probe rod for a gas extraction pipeline, which is mainly used for detecting multiple parameters such as temperature, pressure, flow, methane concentration, gas concentration and the like of the gas extraction pipeline at the same time, so that one machine can detect multiple parameters, and the purposes of integration of detection equipment and simplification of an installation process are achieved. According to the main technical scheme, the multi-parameter detection feeler lever for the gas extraction pipeline comprises a concentration detection chamber, a detection chamber and a detection chamber, wherein the concentration detection chamber comprises a containing space; the concentration detection element is positioned in the accommodating space; an air inlet of the air entraining rod communicates with the air inlet passage, an air outlet communicates with the air outlet passage, and the air inlet passage and the air outlet passage communicate with the containing space; the insertion end is connected with one end, far away from the concentration detection chamber, of the air entraining rod, and the insertion end is connected with a gas flow rate detection part, a temperature detection element, a methane concentration detection part and a pressure detection element. The device is mainly used for multi-parameter detection for the gas extraction pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-parameter detection, and in particular to a multi-parameter detection probe for a gas extraction pipeline. Background Art

[0002] Coal mine gas (primarily methane) extraction and resource utilization technology is not only an effective means of ensuring safe coal mining, but also a path to clean energy utilization, energy conservation, and emission reduction. Therefore, monitoring the relevant technical parameters of gas extraction and transportation is particularly important.

[0003] Gas extraction pipeline detection parameters generally include temperature, pressure, flow rate, methane concentration, carbon monoxide concentration, oxygen concentration, etc. At present, the traditional method of realizing multi-parameter detection of gas extraction pipelines generally adopts the technical means of separately detecting fluid parameters such as temperature, pressure, flow rate, and gas concentration parameters using corresponding special detection equipment, and then transmitting the detection data to the monitoring center for fusion. Among them, fluid parameter detection mostly adopts special detection pipe sections, such as pipe section V-cone flow sensor, pipe section ultrasonic flow sensor, etc. Gas concentration parameter detection mostly adopts differential pressure extraction or pump suction extraction to introduce the pipeline gas to be tested into the gas detection element for concentration measurement. This results in bulky equipment, complex structure, and complex installation process. The realization of multi-parameter detection requires a combination of multiple detection equipment, and the integration is not high. In addition, the special detection pipe section used for fluid parameter detection mostly has large errors in the measurement of low and lower limit wind speeds. In addition, in the detection of gas concentration parameters during coal mine gas extraction, methane concentration detection is particularly important. The pipeline gas to be tested is introduced into the gas detection element for concentration measurement using differential pressure extraction or pump suction extraction. This has a long response time, poor real-time performance, inaccurate measurement, and a short adjustment cycle. Summary of the Invention

[0004] In view of this, in order to solve at least one of the aforementioned technical problems, an embodiment of the present invention provides a multi-parameter detection probe for a gas extraction pipeline, which is at least used to solve the problems of multiple combined equipment, low integration, and complex structure and installation process in the multi-parameter detection of traditional gas extraction pipelines.

[0005] To achieve the above objectives, the present invention mainly provides the following technical solutions:

[0006] The present invention provides a multi-parameter detection probe for a gas extraction pipeline, comprising:

[0007] A concentration detection chamber (2), the concentration detection chamber (2) includes a containing space;

[0008] at least one concentration detection element, the concentration detection element being located in the accommodation space of the concentration detection chamber (2);

[0009] An air inlet rod (3), the air inlet rod (3) comprising an air inlet passage (302), an air outlet passage (304), an air inlet (301) and an air outlet (303), the air inlet (301) being in communication with the air inlet passage (302), the air outlet (303) being in communication with the air outlet passage (304), and both the air inlet passage (302) and the air outlet passage (304) being in communication with the accommodation space;

[0010] The insertion end (4) is connected to an end of the air induction rod (3) away from the concentration detection chamber (2), and the insertion end (4) is connected to a gas flow rate detection element, a temperature detection element (43), a methane concentration detection element, and a pressure detection element (45).

[0011] A mounting seat (21) is provided in the accommodating space, and a gap is provided between the mounting seat (21) and the concentration detection chamber (2) to form a buffer cavity (201). Both the air inlet passage (302) and the air outlet passage (304) are in communication with the buffer cavity (201), and the detection end of the concentration detection element is located in the buffer cavity (201).

[0012] Among them, also include:

[0013] A processing circuit board (1) is provided in the buffer chamber (201); electrical connection lines of the gas flow rate detection element, the temperature detection element (43), the methane concentration detection element, and the pressure detection element (45) pass through the air intake passage (302) and are connected to the processing circuit board (1).

[0014] The air inlet rod (3) is a hollow rod, a hollow thin straight rod (31) is inserted into the air inlet rod (3), an air inlet passage (302) is enclosed between the hollow thin straight rod (31) and the inner wall of the air inlet rod (3), and the hollow thin straight rod (31) includes an air outlet passage (304).

[0015] The air inlet (301) and the air outlet (303) are located at one end of the air inlet rod (3) away from the concentration detection chamber (2), and the air inlet (301) and the air outlet (303) are located on opposite sides of the air inlet rod (3) in the radial direction.

[0016] The insertion end (4) includes a detection area, and an extension direction of the detection area and an extension direction of the air induction rod (3) have a preset angle, and the preset angle is greater than 90 degrees and less than 180 degrees.

[0017] The detection area includes a first end, a second end, and two supporting ribs (47) arranged between the first end and the second end. The first end and the second end are arranged in the extension direction of the detection area. The two supporting ribs (47) are arranged at intervals to form an air path gap (402). The air path gap (402) is used for the pipeline airflow to pass through.

[0018] Wherein, the gas flow rate detection element includes a first ultrasonic transducer (42) and a second ultrasonic transducer (44);

[0019] The first ultrasonic transducer (42) and the second ultrasonic transducer (44) are arranged in a corresponding manner at intervals, and the arrangement direction of the first ultrasonic transducer (42) and the second ultrasonic transducer (44) and the extension direction of the air induction rod (3) have a preset angle, and the preset angle is greater than 90 degrees and less than 180 degrees.

[0020] Wherein, the methane concentration detection component includes a laser (48) and a laser detector (46);

[0021] The laser (48) and the laser detector (46) are arranged at intervals corresponding to each other, and the arrangement direction of the laser (48) and the laser detector (46) has a preset angle with the extension direction of the air induction rod (3), and the preset angle is greater than 90 degrees and less than 180 degrees.

[0022] An air hole (401) is provided at one end of the insertion end (4) away from the air inlet rod (3), and a detection end of the pressure detection element (45) is opposite to the air hole (401) for detecting pipeline gas pressure through the air hole (401).

[0023] The multi-parameter detection probe for a gas extraction pipeline proposed in an embodiment of the present invention mainly detects gas concentration by providing a concentration detection chamber on the detection probe, drawing gas into the concentration detection chamber via an air duct, and detecting gas flow rate, temperature, methane concentration, and pressure by inserting an end. This allows a single detection probe to simultaneously detect multiple parameters of the gas extraction pipeline, including temperature, pressure, flow, methane concentration, carbon monoxide concentration, and oxygen concentration, thus achieving "one device, multiple measurements" and thus achieving the goal of integrated detection equipment and simplified installation process. This solves the problems of multiple combined equipment, low integration, and complex structure and installation process in existing multi-parameter detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a multi-parameter detection probe and a pipeline for a gas extraction pipeline provided by an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of an insertion end in a multi-parameter detection probe for a gas extraction pipeline provided by an embodiment of the present invention.

[0026] 1-processing circuit board; 2-concentration detection chamber; 201-buffer cavity; 21-mounting seat; 22-first concentration detection element; 23-second concentration detection element; 3-air inlet rod; 31-hollow thin straight rod; 301-air inlet; 302-air inlet passage; 303-air outlet; 304-air outlet passage; 4-insertion end; 41-cable; 42-first ultrasonic transducer; 43-temperature detection element; 44-second ultrasonic transducer; 45-pressure detection element; 46-laser detector; 47-support rib; 48-laser; 401-air hole; 402-air path gap. DETAILED DESCRIPTION

[0027] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation method, structure, characteristics and effects of the multi-parameter detection probe for gas extraction pipelines proposed by the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0028] like Figure 1-2 As shown, the present invention provides a multi-parameter detection probe for a gas extraction pipeline, comprising:

[0029] The concentration detection chamber 2 includes a containing space;

[0030] At least one concentration detection element, the concentration detection element is located in the accommodation space of the concentration detection chamber 2;

[0031] The air guide rod 3 includes an air inlet passage 302, an air outlet passage 304, an air inlet 301, and an air outlet 303. The air inlet 301 is connected to the air inlet passage 302, and the air outlet 303 is connected to the air outlet passage 304. Both the air inlet passage 302 and the air outlet passage 304 are connected to the accommodating space.

[0032] Insert the end 4, which is connected to the end of the air inlet rod 3 away from the concentration detection chamber 2, and the insert the end 4 is connected to a gas flow rate detection element, a temperature detection element 43, a methane concentration detection element and a pressure detection element 45.

[0033] The multi-parameter detection probe for gas extraction pipeline is used for gas extraction pipeline 01, such as Figure 1 As shown, the direction of gas flow A in gas extraction pipeline 01 is indicated by the arrow in the figure. Concentration detection chamber 2 is a hollow structure used to accommodate a concentration detection element. This concentration detection element can be a variety of devices for detecting gas concentrations and can be configured based on the type of gas being detected. For the same gas, or for the same concentration detection element, a single one or multiple ones can be configured to provide cross-correlation of acquired data.

[0034] The gas introduction rod 3 is used to guide gas into the concentration detection chamber 2. The gas introduction rod 3 can be connected to the lower portion of the concentration detection chamber 2 in a variety of ways, as long as the gas passage is sealed. For example, the gas introduction rod 3 can be welded to the lower portion of the concentration detection chamber 2. The end of the gas introduction rod 3 away from the concentration detection chamber 2 can be welded to the insertion end 4, or it can be threaded.

[0035] The air inlet 301 and the air outlet 303 can be set in a variety of positions, so that the air flow can enter through the air inlet 301 and be discharged through the air outlet 303. In one embodiment, the air inlet 301 and the air outlet 303 are located at the end of the air rod 3 away from the concentration detection chamber 2, and then the end of the air rod 3 away from the concentration detection chamber 2 only needs to be inserted into a small part of the gas extraction pipeline 01 to ensure that the air inlet 301 and the air outlet 303 are located in the gas extraction pipeline 01, and ensure that the insertion end 4 located below is in a moderate position, the air rod 3 does not take up too much space, so that the detection probe can be used for gas extraction pipelines 01 with smaller diameters. The air inlet 301 and the air outlet 303 are located on radially opposite sides of the air rod 3. When in use, the air inlet 301 is set in the air flow direction A of the front pipe, and the air outlet 303 is set in the air flow direction A of the back pipe. Then, under the pressure of the air flow, the air flow will automatically enter the air inlet 301, and then enter the accommodation space along the air inlet passage 302, and the concentration detection element will perform detection. Since the air pressure at the air outlet 303 is low, the air flow continues to be discharged into the pipe 01 through the air outlet passage 304 and the air outlet 303, thereby realizing the guidance and detection of the air flow.

[0036] Insertion tip 4 is entirely located within pipe 01, meaning the gas flow rate sensor, temperature sensor 43, methane concentration sensor, and pressure sensor 45 are all located within pipe 01. This enables in-situ insertion-based measurement of key parameters such as methane, flow rate, temperature, and pressure, resulting in fast response and high accuracy. Furthermore, since the gas flow rate sensor, temperature sensor 43, methane concentration sensor, and pressure sensor 45 are located close together, their test results are based on a similar location, allowing for integration.

[0037] The multi-parameter detection probe for a gas extraction pipeline proposed in an embodiment of the present invention mainly detects gas concentration by providing a concentration detection chamber on the detection probe, drawing gas into the concentration detection chamber via an air duct, and detecting gas flow rate, temperature, methane concentration, and pressure by inserting an end. This allows a single detection probe to simultaneously detect multiple parameters of the gas extraction pipeline, including temperature, pressure, flow, methane concentration, carbon monoxide concentration, and oxygen concentration, thus achieving "one device, multiple measurements" and thus achieving the goal of integrated detection equipment and simplified installation process. This solves the problems of multiple combined equipment, low integration, and complex structure and installation process in existing multi-parameter detection.

[0038] In one embodiment, a mounting seat 21 is provided in the accommodating space, and a gap is provided between the mounting seat 21 and the concentration detection chamber 2 to form a buffer cavity 201. The air inlet passage 302 and the air outlet passage 304 are both connected to the buffer cavity 201. The detection end of the concentration detection element is located in the buffer cavity 201. The air inlet 301, the air inlet passage 302, the buffer cavity 201, the air outlet passage 304 and the air outlet 303 are connected to form a micro-differential pressure air extraction passage.

[0039] A mounting seat 21 is provided within the accommodation space. A chamber-like gap is left between the lower portion of the mounting seat 21 and the outer shell of the concentration detection chamber 2, forming a buffer chamber 201. The buffer chamber 201 provides voltage stabilization, buffering, and water condensation. One or more concentration detection elements may be provided as needed. For example, the concentration detection elements may include a first concentration detection element 22 and a second concentration detection element 23, each of which can be used to detect different gas concentrations. For example, the first concentration detection element 22 is used to detect carbon monoxide concentration, and the second concentration detection element 23 is used to detect oxygen concentration.

[0040] The first concentration detection element 22 and the second concentration detection element 23 are installed on the mounting seat 21. The air intake detection end parts of the first concentration detection element 22 and the second concentration detection element 23 are connected with the buffer chamber 201 through the holes on the mounting seat 21. The carbon monoxide concentration detection and the oxygen concentration detection adopt the micro-differential pressure gas extraction principle to take gas from the pipeline for measurement.

[0041] In one embodiment, the detection probe further includes: a processing circuit board 1, which is disposed in the buffer chamber 201, and electrical connection lines of the gas flow rate detection element, the temperature detection element 43, the methane concentration detection element, and the pressure detection element 45 pass through the air intake passage 302 and are connected to the processing circuit board 1.

[0042] In the embodiment including the mounting base 21, a processing circuit board mounting base is provided on the back side of the buffer cavity 201 of the mounting base 21 for mounting the processing circuit board 1. The mounting base 21 is provided with a lead hole for inserting the terminal 4 detection component power supply and signal transmission cable 41 through which the power supply and signal transmission cable 41 is connected to the processing circuit board 1.

[0043] The air guide rod 3 is a hollow rod, and the air inlet passage 302 and the air outlet passage 304 can be formed in a variety of ways. For example, in one embodiment, the air guide rod 3 is a hollow cylindrical straight rod structure, and the hollow part of the air guide rod serves as the air inlet passage 302 and the insertion end 4 detection component power supply and signal transmission cable 41 passes through the cavity. A hollow thin straight rod 31 is inserted into the air guide rod 3, or it can be said that the hollow thin straight rod 31 and the inner wall of the air guide rod 3 enclose the air inlet passage 302, and the hollow thin straight rod 31 includes an air outlet passage 304. The air inlet 301 is connected to the air inlet passage 302 of the hollow part of the air guide rod 3, and the air outlet 303 is connected to the air outlet passage 304 of the hollow thin straight rod 31 inside the air guide rod 3. It can be understood that the hollow thin straight rod 31 is close to the inner wall of the air guide rod 3, that is, the air outlet 303 will not be directly connected to the air inlet passage 302, thereby ensuring that the air flow will definitely pass through the buffer cavity 201.

[0044] In one embodiment, the insertion end 4 includes a detection area, and an extension direction of the detection area and an extension direction of the air induction rod 3 have a preset angle, and the preset angle is greater than 90 degrees and less than 180 degrees.

[0045] The detection area is located in the area of ​​the insertion end 4 away from the air inlet rod 3. The detection area bends at a certain angle toward the air inlet 301, or in other words, toward the side facing the pipeline airflow direction A. This provides a detection angle for the gas flow rate detector, temperature detection element 43, methane concentration detector, and pressure detection element 45, thereby achieving the detection purpose. The preset angle can be 150 degrees.

[0046] In one embodiment, the detection area includes a first end, a second end, and two supporting ribs 47 arranged between the first end and the second end. The first end and the second end are arranged in the extension direction of the detection area, and the two supporting ribs 47 are arranged at intervals to form an air path gap 402, which is used for pipeline airflow to pass through.

[0047] The first end and the second end are spaced apart in the longitudinal direction of the detection area, or in a direction inclined toward or away from the air induction rod 3. When in use, the opening direction of the air path gap 402 is consistent with the pipeline airflow direction A, thereby allowing the pipeline airflow to directly pass through the air path gap 402.

[0048] In one embodiment, the gas flow rate detector includes a first ultrasonic transducer 42 and a second ultrasonic transducer 44. The first ultrasonic transducer 42 and the second ultrasonic transducer 44 are spaced apart and arranged in a corresponding manner. The arrangement direction of the first ultrasonic transducer 42 and the second ultrasonic transducer 44 forms a preset angle with the extension direction of the air induction rod 3. The preset angle is greater than 90 degrees and less than 180 degrees.

[0049] The methane concentration detector includes a laser 48 and a laser detector 46. The laser 48 and the laser detector 46 are arranged in a corresponding manner, and the arrangement direction of the laser 48 and the laser detector 46 has a preset angle with the extension direction of the air induction rod 3, and the preset angle is greater than 90 degrees and less than 180 degrees.

[0050] The layout direction of the first ultrasonic transducer 42 and the second ultrasonic transducer 44, as well as the layout direction of the laser 48 and the laser detector 46, can be arranged according to the extension direction of the detection area, for example, they can be arranged at a 150-degree angle. In an embodiment where the detection area includes a first end and a second end, the first end is closer to the air induction rod 3, and the second end is farther away from the air induction rod 3. The first end is provided with a transducer mounting hole for mounting the first ultrasonic transducer 42 for flow velocity detection. The first end is also provided with a laser mounting hole for mounting the laser 48 for methane detection. The first end is also provided with a temperature detection element mounting hole for mounting the temperature detection element 43. The second end is provided with an ultrasonic transducer mounting hole for mounting the second ultrasonic transducer 44 for flow velocity detection. The second end is also provided with a laser detector mounting hole for mounting the laser detector 46 for methane detection. The first ultrasonic transducer 42 and the second ultrasonic transducer 44 are arranged correspondingly. The laser 48 and the laser detector 46 are arranged correspondingly. The support rib 47 is hollow inside, and is used for passing power supply and signal transmission cables of the second ultrasonic transducer 44, the laser detector 46, and the pressure detection element 45 away from one end of the air induction rod 3.

[0051] The first ultrasonic transducer 42 and the second ultrasonic transducer 44 are used to cooperate in detecting the flow velocity of the airflow in the pipeline. The first ultrasonic transducer 42 and the second ultrasonic transducer 44 are set in pairs and need to be aligned and adjusted. Specifically, the acoustic transducer can detect the gas flow velocity based on the ultrasonic propagation time difference method or the Doppler effect. In the time difference method, when ultrasonic waves propagate in the gas, the propagation speed in the direction of the airflow will increase, and the propagation speed in the opposite direction of the airflow will slow down. By measuring the propagation time difference in the two directions, the gas flow velocity can be calculated. In the Doppler method, the gas contains tiny particles, and the ultrasonic wave will produce a frequency shift when encountering moving particles. The flow velocity can be inferred by measuring the frequency difference. The gas flow velocity measurement based on the ultrasonic principle can achieve accurate measurement of the flow velocity, and the structure is simple and easy to install and maintain.

[0052] Methane concentration is detected by the optical path formed between a laser 48 installed at the proximal end of the insertion end 4 and a laser detector 46 at the distal end. This is primarily based on absorption spectroscopy technology, which quantitatively analyzes concentration by measuring the degree of absorption of specific laser wavelengths by methane molecules. The methane detection laser 48 and laser detector 46 are aligned in pairs and require alignment and calibration. More specifically, methane concentration detection utilizes tunable semiconductor laser absorption spectroscopy technology, which features anti-interference, high resolution, fast response speed, and a long calibration cycle. Furthermore, the laser 48 and laser detector 46 are inserted into the ventilation duct 01, avoiding the influence of the "extraction method" air bleed principle and the air delivery of the air bleed pipeline, and have the advantages of fast response speed, high accuracy, and minimal environmental impact.

[0053] In one embodiment, an air hole 401 is provided at one end of the insertion end 4 away from the air guide rod 3 , and a detection end of the pressure detection element 45 is opposite to the air hole 401 for detecting pipeline gas pressure through the air hole 401 .

[0054] The end of the insertion end 4 away from the air inlet rod 3 is provided with a pressure detection element mounting hole for mounting the pressure detection element 45. The front end of the pressure detection element 45 mounting position is provided with an air hole 401 for connecting the pipeline gas with the pressure detection element 45 to detect the gas pressure.

[0055] The following is a brief description of the installation and working process of the detection probe in this application for a clearer understanding:

[0056] S1, a multi-parameter detection probe for the gas extraction pipeline is inserted and installed on the gas extraction pipeline 01;

[0057] S2. Adjust the installation direction so that the bending direction of the insertion end 4 faces the airflow direction A of the pipeline and is as close to the middle of the diameter of the pipeline O1 as possible;

[0058] S3. When the pipeline gas flows through the narrow gas path gap 402 between the support ribs 47 of the insertion end 4, the gas flow rate can be detected by the opposing ultrasonic transducers (first ultrasonic transducer 42 and second ultrasonic transducer 44) that form a certain angle with the airflow direction. The methane concentration is detected by the optical path formed between the laser 48 and the laser detector 46. The temperature is detected by the temperature detection element 43, and the pressure is detected by the pressure detection element 45.

[0059] S4. When the pipeline gas flows through, the gas enters from the air inlet 301, passes through the air inlet passage 302 of the air guide rod 3, and enters the buffer chamber 201 of the concentration detection chamber 2;

[0060] S5, carbon monoxide, oxygen and other detection elements can detect the gas concentration in the buffer chamber 201;

[0061] S6. The gas in the buffer chamber 201 flows back to the pipeline 01 through the gas outlet passage 304 and the gas outlet 303 of the gas induction rod 3;

[0062] S7. All detection signals are connected to the processing circuit board 1 through the cable 41 to complete signal processing.

[0063] In addition, a meter with display, alarm and other functions can be connected to the multi-parameter detection probe for gas extraction pipelines. The meter is electrically connected to the processing circuit board 1 and is used to display various detection and processing signals of the multi-parameter detection probe for gas extraction pipelines.

[0064] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A multi-parameter detection probe for a gas extraction pipeline, characterized in that: include: A concentration detection chamber (2), wherein the concentration detection chamber (2) comprises a containing space; at least one concentration detection element, the concentration detection element being located in the accommodation space of the concentration detection chamber (2); An air guide rod (3), the air guide rod (3) comprising an air inlet passage (302), an air outlet passage (304), an air inlet (301) and an air outlet (303), the air inlet (301) being in communication with the air inlet passage (302), the air outlet (303) being in communication with the air outlet passage (304), and both the air inlet passage (302) and the air outlet passage (304) being in communication with the accommodating space; An insertion end (4) is connected to an end of the gas induction rod (3) away from the concentration detection chamber (2), and the insertion end (4) is connected to a gas flow rate detection element, a temperature detection element (43), a methane concentration detection element, and a pressure detection element (45).

2. The multi-parameter detection probe for gas extraction pipeline according to claim 1 is characterized in that: A mounting seat (21) is provided in the accommodating space, and a gap is provided between the mounting seat (21) and the concentration detection chamber (2) to form a buffer cavity (201). The air inlet passage (302) and the air outlet passage (304) are both in communication with the buffer cavity (201), and the detection end of the concentration detection element is located in the buffer cavity (201).

3. The multi-parameter detection probe for gas extraction pipeline according to claim 1 is characterized in that: Also includes: A processing circuit board (1) is provided in the buffer chamber (201); electrical connection lines of the gas flow rate detection element, the temperature detection element (43), the methane concentration detection element, and the pressure detection element (45) pass through the air intake passage (302) and are connected to the processing circuit board (1).

4. The multi-parameter detection probe for gas extraction pipeline according to claim 1, characterized in that: The air inlet rod (3) is a hollow rod, a hollow thin straight rod (31) is inserted into the air inlet rod (3), the hollow thin straight rod (31) and the inner wall of the air inlet rod (3) enclose the air inlet passage (302), and the hollow thin straight rod (31) includes the air outlet passage (304).

5. The multi-parameter detection probe for gas extraction pipeline according to claim 1 is characterized in that: The air inlet (301) and the air outlet (303) are located at one end of the air inlet rod (3) away from the concentration detection chamber (2), and the air inlet (301) and the air outlet (303) are located on opposite sides of the air inlet rod (3) in the radial direction.

6. The multi-parameter detection probe for gas extraction pipeline according to claim 1, characterized in that: The insertion end (4) comprises a detection area, and an extension direction of the detection area and an extension direction of the air induction rod (3) have a preset angle, and the preset angle is greater than 90 degrees and less than 180 degrees.

7. The multi-parameter detection probe for gas extraction pipeline according to claim 6, characterized in that: The detection area includes a first end, a second end, and two supporting ribs (47) arranged between the first end and the second end. The first end and the second end are arranged in the extension direction of the detection area. The two supporting ribs (47) are arranged at intervals to form an air path gap (402). The air path gap (402) is used for pipeline airflow to pass through.

8. The multi-parameter detection probe for gas extraction pipeline according to claim 1, characterized in that: The gas flow rate detection element includes a first ultrasonic transducer (42) and a second ultrasonic transducer (44); The first ultrasonic transducer (42) and the second ultrasonic transducer (44) are arranged at intervals corresponding to each other, and the arrangement direction of the first ultrasonic transducer (42) and the second ultrasonic transducer (44) have a preset angle with the extension direction of the air induction rod (3), and the preset angle is greater than 90 degrees and less than 180 degrees.

9. The multi-parameter detection probe for gas extraction pipeline according to claim 1, characterized in that: The methane concentration detection element includes a laser (48) and a laser detector (46); The laser (48) and the laser detector (46) are arranged in a corresponding manner at intervals, and the arrangement direction of the laser (48) and the laser detector (46) has a preset angle with the extension direction of the air induction rod (3), and the preset angle is greater than 90 degrees and less than 180 degrees.

10. The multi-parameter detection probe for gas extraction pipeline according to claim 1, characterized in that: An air hole (401) is provided at one end of the insertion end (4) away from the air guide rod (3), and a detection end of the pressure detection element (45) is opposite to the air hole (401) and is used to detect pipeline gas pressure through the air hole (401).

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