A gas sampling device and a gas flux detection device for a pipeline

Abstract

The utility model relates to a greenhouse gas monitoring technical field especially relates to a gas sampling device and gas flux detection device for pipeline, and gas sampling device includes sampling gun and connecting seat, the connecting seat is installed on the sampling hole of the measured pipeline, and the inner chamber of connecting seat is provided with sealing seat, is equipped with sealing channel on sealing seat, and sealing channel communicates sampling hole, the sampling gun includes sampling pipe, sealing plug and sealing cover, the side of sampling pipe is close to the one side of exhaust end and sets up sealing plug and sealing cover, sealing plug with sealing channel's shape matches, sealing cover is located the side of sealing plug deviates the sampling pipe air inlet end, sampling pipe passes sealing channel and extends into the inside of measured pipeline, sealing plug and sealing channel inner wall abut, sealing cover with connecting seat is detachably connected, the utility model provides a gas sampling device can improve the reliability of sealing connection between sampling hole and sampling pipe.

Description

Technical Field

[0001] This utility model relates to the field of greenhouse gas monitoring technology, and in particular to a gas sampling device for pipelines and a gas flux detection device for pipelines. Background Technology

[0002] Wastewater treatment processes release greenhouse gases into the atmosphere. Greenhouse gases are gases in the atmosphere that absorb solar radiation reflected from the Earth's surface and then re-emit radiation, such as nitrous oxide, carbon dioxide, and methane. They warm the Earth's surface, similar to a greenhouse trapping solar radiation and heating the air inside, thus causing global temperatures to rise. To control greenhouse gas emissions, gas flux monitoring devices are needed.

[0003] For gases emitted through pipelines, existing technologies typically involve installing a sampling gun on the pipeline to collect gas samples, using a gas analyzer to determine the concentration of greenhouse gases in the samples, and measuring the total flow rate within the pipeline using sensors. The greenhouse gas emissions are then calculated based on the total flow rate and the greenhouse gas concentration. Specifically, existing technologies usually involve setting a sampling port on the pipeline being tested, inserting the sampling tube of the sampling gun into the sampling port, with the sampling head at the rear end of the sampling tube remaining outside the pipeline. To ensure the accuracy of the sampling data, the gap between the sampling gun and the sampling port needs to be sealed during sampling.

[0004] Currently, the common method for sealing is by plugging with cloth. This method is relatively simple and suitable for pipelines with a small pressure difference from the outside. However, if the pressure difference between the pipeline and the outside is large, plugging with cloth alone cannot guarantee a good seal between the sampling gun and the sampling port. The suction force inside the pipeline on the sampling port is strong, which not only causes air leakage, affecting the representativeness of the gas sample, but also easily sucks the cloth in, affecting equipment operation. To address the above problems, patent document CN201420148480.1 discloses a sealing device for a flue sampling and measuring port. It has an outlet pipe seat with a sealing flange welded at the flue opening. The sealing flange is connected to a flange cover by bolts. The flange cover has a sampling port, which is connected to a plug through a threaded hole. When testing is required, the plug is removed, and the detection probe is inserted into the sampling port. The detection probe has threads and is sealed to the sampling port through these threads. Although this device has a certain sealing effect, air leakage still occurs at the threaded connection between the sampling port and the detection probe, failing to guarantee a good seal. In addition, the sampling head at the rear of some sampling guns, because it encapsulates components such as air pumps and circuit boards, plus the housing that encapsulates these components, is usually heavier than the sampling tube. When the sampling gun can only be inserted horizontally into the pipe being tested due to the pipe routing or external space constraints, the sampling gun is heavier at one end than the other. The sampling head is prone to sinking under its own weight, causing the sampling tube of the sampling gun to tilt slightly, creating a gap between it and the sampling hole, further aggravating air leakage and affecting the accuracy of the measured data. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a gas sampling device and a gas flux detection device for pipelines, which solves the technical problem of poor sealing effect between the existing sampling tube and the sampling hole.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] In a first aspect, this utility model provides a gas sampling device for pipelines, comprising: a sampling gun and a connecting base;

[0010] The connector is installed on the sampling hole of the pipe being tested. The inner cavity of the connector is provided with a sealing seat, and the sealing seat is provided with a sealing channel, which is connected to the sampling hole.

[0011] The sampling gun includes a sampling tube, a sealing plug, and a sealing cap. The sealing plug and the sealing cap are fitted onto the side of the sampling tube near the air outlet. The shape of the sealing plug matches the sealing channel. The sealing cap is located on the side of the sealing plug away from the air inlet of the sampling tube.

[0012] The sampling tube extends into the inside of the pipe being tested through the sealed channel, the sealing plug abuts against the inner wall of the sealed channel, and the sealing cover is detachably connected to the connecting seat.

[0013] Optionally, the sealing seat includes a support plate and a rubber ring;

[0014] The support plate is fixedly connected to the connecting seat. The support plate has a through hole for the sampling tube to pass through. The rubber ring is located on the side of the support plate away from the pipe being tested, and the outer diameter of the rubber ring is the same as the inner diameter of the connecting seat.

[0015] Optionally, the inner cavity of the rubber ring is frustum-shaped, and the inner diameter of the end of the rubber ring facing the support plate is smaller than the inner diameter of the end facing away from the support plate.

[0016] Optionally, the sealing plug is a frustum-shaped soft plug, and the diameter of the side of the sealing plug facing the air inlet end of the sampling tube is smaller than the diameter of the side facing away from the air inlet end of the sampling tube.

[0017] Optionally, the through hole is a circular hole, and the diameter of the through hole is smaller than the diameter of the side of the sealing plug facing the air inlet end of the sampling tube.

[0018] Optionally, the sealing plug has an anti-corrosion layer on its end face facing the air inlet end of the sampling tube.

[0019] Optionally, the sealing cap is threadedly connected to the connecting seat.

[0020] Optionally, the sampling gun further includes a sampling head and a counterweight;

[0021] The sampling head is located at the air outlet of the sampling tube, and the counterweight is located at the air inlet of the sampling tube.

[0022] Optionally, a threaded sleeve is fixedly provided on the outer wall of the air inlet end of the sampling tube. The outer circumferential surface of the threaded sleeve is provided with an external thread. The counterweight has an inner hole with an internal thread on the inner wall of the inner hole. The internal thread of the inner hole of the counterweight engages with the external thread on the threaded sleeve.

[0023] Secondly, this utility model provides a gas flux detection device for pipelines, including a wind speed sensor and the gas sampling device described in the first aspect;

[0024] The wind speed sensor is equipped with a probe that penetrates the sealing cover and the sealing plug and extends into the pipe being measured.

[0025] (III) Beneficial Effects

[0026] The beneficial effects of this utility model are as follows: The gas sampling device of this utility model includes a sampling gun and a connecting seat; the connecting seat is installed on the sampling hole of the pipe to be tested, and a sealing seat is provided in the inner cavity of the connecting seat, and a sealing channel is provided on the sealing seat, which communicates with the sampling hole; the sampling gun includes a sampling tube, a sealing plug and a sealing cap, and the sealing plug and the sealing cap are fitted on the side of the sampling tube near the gas outlet end, the shape of the sealing plug matches the sealing channel, and the sealing cap is located on the side of the sealing plug away from the gas inlet end of the sampling tube; the sampling tube extends into the inside of the pipe to be tested through the sealing channel, the sealing plug abuts against the inner wall of the sealing channel, and the sealing cap is detachably connected to the connecting seat.

[0027] Based on the sealing seat and the sealing plug whose shape matches the sealing channel, the sampling tube and the sealing plug can be sealed together, and the sealing plug and the sealing seat can be sealed together. This improves the reliability of the sealing connection between the sampling hole and the sampling tube, ensures the representativeness of the gas sample collected by the sampling gun, and thus improves the accuracy of the final gas data. Attached Figure Description

[0028] Figure 1 This is a front view structural schematic diagram of Embodiment 1 of the gas sampling device of this utility model;

[0029] Figure 2 This is a schematic diagram of the structure of a sealing seat according to the present invention;

[0030] Figure 3 This is a schematic diagram of another sealing seat according to the present invention;

[0031] Figure 4 This is a schematic diagram of the sealing cap and connecting seat of this utility model;

[0032] Figure 5 This is a front view structural schematic diagram of Embodiment 2 of the gas sampling device of this utility model;

[0033] Figure 6 This is a front view structural schematic diagram of Embodiment 3 of the gas flux detection device of this utility model.

[0034] [Explanation of Labels in the Attached Image]

[0035] 1. Pipe under test; 2. Sampling hole; 3. Connecting seat; 4. Sealing seat; 5. First flange; 6. Second flange; 7. Sampling tube; 8. Sealing plug; 9. Sealing cover; 10. Support plate; 11. Rubber ring; 12. Third flange; 13. Connecting ring; 14. Sampling head; 15. Counterweight; 16. Threaded sleeve; 17. Wind speed sensor; 18. Probe. Detailed Implementation

[0036] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] The gas sampling device proposed in this embodiment of the invention includes a connecting seat between the sampling gun and the sampling tube. A sealing seat is fixedly installed inside the connecting seat, and a sealing channel is provided on the sealing seat. The sampling tube of the sampling gun is provided with a sealing plug whose shape matches the inner cavity of the sealing channel. When the sealing plug is securely connected to the connecting seat, it abuts against the inner wall of the sealing channel, thereby achieving a sealed connection between the sampling tube and the sealing plug, and between the sealing plug and the sealing seat. This improves the reliability of the sealing connection between the sampling hole and the sampling tube, ensures the representativeness of the gas sample collected by the sampling gun, and ultimately improves the accuracy of the final gas concentration data.

[0038] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0039] Example 1:

[0040] like Figure 1 As shown, this embodiment provides a gas sampling device for pipelines, including a sampling gun and a connecting base 3.

[0041] The connecting seat 3 is installed on the sampling port 2 of the pipe being tested 1. The inner cavity of the connecting seat 3 is provided with a sealing seat 4, which has a sealing channel communicating with the sampling port 2. Specifically, the sampling port 2 is provided with a first flange 5, and the end of the connecting seat 3 facing the sampling port 2 is provided with a second flange 6. The first flange 5 and the second flange 6 are fastened together by bolts and nuts. A sealing gasket can also be provided between the first flange 5 and the second flange 6 to further improve the sealing effect between them.

[0042] The sampling gun includes a sampling tube 7, a sealing plug 8, and a sealing cap 9. The sealing plug 8 and the sealing cap 9 are fitted onto the side of the sampling tube 7 near the air outlet. The sealing plug 8 matches the shape of the sealing channel. The sealing cap 9 is located on the side of the sealing plug 8 away from the air inlet of the sampling tube 7. The sampling tube 7 passes through the sealing channel and extends into the inside of the pipe 1 to be tested. The sealing plug 8 abuts against the inner wall of the sealing channel. The sealing cap 9 is detachably connected to the connecting seat 3.

[0043] Based on the sealing seat 4 and the sealing plug 8 whose shape matches the sealing channel, the sampling tube 7 can be sealed to the sealing plug 8, and the sealing plug 8 can be sealed to the sealing seat 4, thereby improving the reliability of the sealing connection between the sampling hole 2 and the sampling tube 2, ensuring the representativeness of the gas sample collected by the sampling gun, and thus improving the accuracy of the final gas concentration data.

[0044] Specifically, the sealing seat 4 includes a support plate 10 and a rubber ring 11. The support plate 10 is fixedly connected to the connecting seat 3. The support plate 10 has a through hole for the sampling tube 7 to pass through. The rubber ring 11 is located on the side of the support plate 10 away from the pipe 1 being tested, and the outer diameter of the rubber ring 11 is the same as the inner diameter of the connecting seat 3. The inner cavity of the rubber ring 11, i.e., the sealing channel, is frustum-shaped, and the inner diameter of the end of the rubber ring 11 facing the support plate 10 is smaller than the inner diameter of the end away from the support plate 10. The support plate 10 is used to support the rubber ring 11 and prevent it from sliding towards the pipe 1 being tested when it abuts against the sealing plug 8. The fixed connection between the support plate 10 and the connecting seat 3 can be welding or integral molding.

[0045] In fact, the shape of the inner cavity of the aforementioned rubber ring 11, that is, the shape of the sealing channel, can be any shape that is larger at one end and smaller at the other. For example, in addition to being frustum-shaped, it can also be frustum-conical or... Figure 2 The hemispherical shape shown has its convex surface facing the pipe 1 being tested. The rubber ring 11 itself has good deformability, allowing it to fit more tightly with the sealing plug 8 when in contact, ensuring a good seal. Preferably, in this embodiment, the inner cavity of the rubber ring 11 is set as... Figure 1 The frustum shape shown provides more space for the sealing plug 8 to rotate into the inner cavity compared to the frustum cone shape, and is more regular in shape than the hemispherical shape, which facilitates mass production and storage.

[0046] Matching the inner cavity shape of the rubber ring 11, the sealing plug 8 is a frustoconical soft plug, and the diameter of the side of the sealing plug 8 facing the air inlet end of the sampling tube 7 is smaller than the diameter of the side facing away from the air inlet end of the sampling tube 7. Specifically, the material of the sealing plug 8 can be one of rubber, asbestos, artificial leather, polytetrafluoroethylene plastic, or a mixture of two or more of the above materials.

[0047] The end face of the sealing plug 8 facing the air inlet of the sampling tube 7 is provided with an anti-corrosion layer to prevent the gas inside the tested pipeline 1 from corroding the sealing plug 8. Specifically, the anti-corrosion layer can be one or more of polyurethane, epoxy, and polyethylene layers.

[0048] Preferably, the through hole on the support plate 10 is a circular hole, and the diameter of the through hole is less than or equal to the diameter of the side of the sealing plug 8 facing the air inlet end of the sampling tube 7. Figure 3As shown, when the diameter of the through hole is smaller than the diameter of the side of the sealing plug 8 facing the air inlet end of the sampling tube 7, a portion of the end face of the sealing plug 8 facing the air inlet end of the sampling tube 7 can abut against the support plate 10 when the sealing cover 9 and the connecting seat 3 are tightly connected, further ensuring the sealing effect. More preferably, because the sealing plug 8 is a soft plug with a certain deformation capacity, the axial length of the sealing plug 8 in its natural state (non-stressed state) is slightly greater than the distance between the side of the support plate 10 away from the pipe 1 being tested and the end face of the connecting seat 3 away from the pipe 1 being tested. Thus, when the sealing cover 9 and the connecting seat 3 are tightly connected, the sealing plug 8 is compressed and expands radially, fitting more tightly inward against the sampling tube 7 and abutting more tightly outward against the rubber ring 11, further improving the sealing effect. Moreover, the sealing plug 8, which expands radially under pressure, also squeezes the rubber ring 11, making it abut more tightly against the inner wall of the connecting seat 3, thereby completely sealing the inner cavity of the connecting seat 3 and further preventing air leakage.

[0049] A sealing connection is formed between the sealing cap 9 and the connecting seat 3. Specifically, as shown... Figure 4 As shown, the sealing cover 9 and the connecting seat 3 can be connected by a flange. Specifically, the end face of the connecting seat 3 facing away from the pipe being tested is provided with a third flange 12, the sealing cover 9 is a flange cover, and the third flange 12 and the flange cover 9 are fastened together by bolts and nuts.

[0050] Preferably, to facilitate the installation and removal of the sampling gun, the sealing cover 9 and the connecting seat 3 can be threaded together. Specifically, as shown in the figure... Figure 1 As shown, the outer edge of the connector 3 opposite to the pipe 1 being tested is provided with a threaded groove, and the sealing cover 9 is provided with a connecting ring 13 facing the side of the connector. The inner diameter of the connecting ring 13 is the same as the outer diameter of the connector 3. The inner side of the connecting ring 13 is provided with a threaded protrusion that mates with the threaded groove. The connecting ring 13 is connected to the connector 3 through the threaded protrusion and the threaded groove.

[0051] The sealing cap 9 and the sampling tube 7 can be fixedly connected or movably connected. Preferably, based on the length setting of the sealing plug 8 and the threaded connection between the sealing cap 9 and the connecting seat 3, the sealing cap 9 and the sampling tube 7 can be movably connected to ensure that the sealing cap 9 can rotate and move more smoothly on the connecting seat 3. It is easy to understand that the sealing plug 8 and the rubber ring 11, which match each other in shape, can already ensure the airtightness within the connecting seat 3, and the movable connection with gaps between the sealing cap 9 and the sampling tube 7 will not compromise the airtightness within the connecting seat 3.

[0052] Example 2:

[0053] Based on the connector 3 provided in Embodiment 1, this embodiment further improves the sampling tube 7 of the sampling gun. The shape, structure and cooperation relationship of the sampling tube 7 with other components will be specifically described below with reference to the accompanying drawings.

[0054] like Figure 5 As shown, this embodiment provides a gas sampling device for a pipeline, including a sampling gun and a connecting seat 3 for connecting to a sampling hole 2 on the pipeline 1 to be tested.

[0055] The sampling gun includes a sampling tube 7, a sampling head 14, and a counterweight 15. The sampling head 14 is located at the air outlet of the sampling tube 7, and the counterweight 15 is located at the air inlet of the sampling tube.

[0056] Based on the above settings, when the sampling gun is horizontally inserted into the pipe 1 being tested, the weight of the two ends of the sampling tube 7 is relatively balanced, thereby preventing one end of the sampling head 14 from sinking due to excessive weight. During long-term use, this would cause the sampling tube 7 of the sampling gun to tilt slightly, creating a gap between it and the sampling hole 2, resulting in air leakage and affecting the accuracy of the measured data.

[0057] Specifically, the counterweight 15 can be configured in various forms on the sampling tube. For example, if the sampling tube 7 and the sampling head 14 are fixedly paired components in a one-to-one correspondence, then given the weight of the sampling head 14 and the distance from its center of gravity to the connecting seat 3, based on the lever principle, the weight of the counterweight 15 and the distance between the counterweight 15 and the connecting seat 3 can also be determined accordingly. Therefore, the counterweight 15 can be fixedly set at a specific position on the sampling tube 7. Specifically, it can be a counterweight ring fixedly sleeved on the outside of the sampling tube 7, or it can be a thickened section of tube on the sampling tube 7.

[0058] If the sampling tube 7 and the sampling head 14 are not fixed components that correspond one-to-one, for example, if the sampling tube 7 is a tube that can be used for multiple sampling heads 14, and different sampling heads 14 can be replaced according to different sampling data, then the counterweight 15 needs to be adjusted accordingly based on the weight of different sampling heads 14. Specifically, it can be replaced with a counterweight 15 of different weight corresponding to different sampling heads 14, or the same counterweight 15 can be used, and the weight of the sampling head 14 can be balanced by adjusting the position of the counterweight 15 on the sampling tube 7.

[0059] Specifically, such as Figure 5 As shown, a threaded sleeve 16 can be fixedly installed on the outer wall of the air inlet end of the sampling tube 7. The outer circumferential surface of the threaded sleeve 16 is provided with an external thread. The counterweight 15 is provided with an inner hole, and the inner wall of the inner hole is provided with an internal thread. The internal thread of the inner hole of the counterweight 15 engages with the external thread on the threaded sleeve 16. By rotating the counterweight 15, it can be moved along the axial direction of the threaded sleeve 16.

[0060] Based on this setup, the weight of the sampling head 14 can be balanced by replacing the counterweights 15 with different weights, or by rotating the counterweights 15 to change their position on the sampling tube 7, thus adjusting the lever arm corresponding to the gravity acting on the counterweights to balance the gravity acting on the sampling head 14. This ensures that the sampling gun remains balanced when horizontally positioned on the pipe being tested 1. The cross-section of the counterweight 15 can be an equilateral triangle, square, regular hexagon, regular octagon, or circle. To ensure that the counterweight 15 can smoothly pass through the through-hole on the support plate 10 along with the sampling tube 7, the radius of the circumscribed circle of the counterweight 15 is smaller than the radius of the inscribed circle of the through-hole on the support plate 10. Preferably, the through-hole on the support plate 10 is circular, the cross-section of the counterweight 15 is circular, and the outer radius of the counterweight 15 is smaller than the radius of the through-hole on the support plate 10.

[0061] Example 3:

[0062] This embodiment provides a gas flux detection device for pipelines, including a wind speed sensor 17 and a gas sampling device provided in Embodiments 1 and 2. The wind speed sensor 17 is provided with a probe 18, which extends into the pipeline 1 to be tested through the sealing cover 9 and the sealing plug 8.

[0063] Specifically, the wind speed sensor 17 can be installed on the same connector 3 as the sampling gun. Alternatively, to improve the accuracy of the measured wind speed, the wind speed sensor and the sampling gun can be installed on sampling holes 2 at different positions on the pipe being measured 1, so as to prevent the sampling tube 7 of the sampling gun from affecting the accuracy of the data collected by the wind speed sensor 17.

[0064] like Figure 6 As shown, if the wind speed sensor and sampling gun are set separately, the wind speed sensor 7 can also be equipped with a corresponding connecting seat 3, sealing seat 4, sealing plug 8 and sealing cover 9. The sealing seat 4 inside the connecting seat 3 is provided with a sealing channel; the sealing plug 8 is sleeved on the outside of the probe 18 of the wind speed sensor 17, and the shape of the sealing plug 8 matches the inner cavity of the sealing channel. The sealing cover 9 is set on the side of the sealing plug 8 away from the pipe 1 being measured; the probe of the wind speed sensor extends into the inside of the pipe 1 being measured through the sealing channel. When the sealing cover 9 is tightly connected to the connecting seat 3, the sealing plug 8 abuts against the inner wall of the sealing channel.

[0065] The wind speed sensor 17 utilizes existing equipment. For example, it can use a differential pressure wind speed sensor provided in patent document CN202022039816.9, which includes a control center and a detection component. The detection component is fixed to the bottom of the control center via an adapter. Inside the control center, there is a differential pressure sensor, a main circuit board, an alarm component, and a screen component. The detection component includes a Pitot tube probe, a mounting base, and a first silicone tube arranged opposite each other. The mounting base is rotatably connected to the adapter. The Pitot tube probe is located at one end of the mounting base, and the first silicone tube is located at the other end of the mounting base and communicates with the Pitot tube probe. The first silicone tube communicates with a second silicone tube on the differential pressure sensor. The Pitot tube probe of this differential pressure wind speed sensor can penetrate the sealing cover 9 and the sealing plug 8 and extend into the measured pipe 1. One air inlet of the Pitot tube probe faces the direction of the incoming wind in the measured pipe 1 to measure the wind speed inside the pipe.

[0066] Based on the wind speed and the diameter of the pipe being tested, the total gas flow rate in pipe 1 can be determined. Based on the gas samples collected by the sampling guns provided in Examples 1 and 2, the concentration of the target greenhouse gas can be determined using a gas analyzer. The product of the target greenhouse gas concentration and the total gas flow rate is the flow rate of the target greenhouse gas to be monitored.

[0067] Based on the sealing seat 4 and the sealing plug 8 whose shape matches the sealing channel, the sampling tube 7 can be sealed to the sealing plug 8, and the sealing plug 8 can be sealed to the sealing seat 4. This improves the reliability of the sealing connection between the sampling hole 2 and the sampling tube 2, ensures the representativeness of the gas sample collected by the sampling gun, and thus improves the accuracy of the final gas concentration data and gas flux data.

[0068] In addition, to further improve the accuracy of the collected gas concentration and gas flux data, the gas flux detection device may also include a temperature sensor, a pressure sensor, and a humidity sensor. The temperature sensor, pressure sensor, and humidity sensor are fixedly installed on the outer peripheral side wall of the sampling tube 7 of the sampling gun. Alternatively, the temperature sensor, pressure sensor, and humidity sensor may also be equipped with acquisition probes. The acquisition probes are similar to the probe 18 of the wind speed sensor 17, penetrating the sealing cover 9 and the sealing plug 8 and extending into the pipe under test to collect the temperature, pressure, and humidity inside the pipe under test, so as to convert the above-mentioned gas concentration into the gas concentration under standard conditions.

[0069] Specifically, the conversion formula between real-time gas concentration and gas concentration under standard conditions is as follows:

[0070]

[0071] Wherein, C1, T1, and P1 are the gas concentration, temperature, and pressure collected in real time, and C0, T0, and P0 are the gas concentration, temperature, and pressure under standard conditions. C0, T0, and P0 are collected by the gas flux detection device provided in this embodiment. The temperature T0 under standard conditions is 0℃, and the pressure P0 under standard conditions is 0.1MPa. Substituting C0, T0, P0, T1, and P1 into the above formula, the gas concentration under standard conditions can be obtained.

[0072] Furthermore, in the field of gas concentration detection in pipelines, if the gas in the pipeline has high humidity and forms droplets, these droplets may absorb some of the gas, affecting the accuracy of the final measured gas concentration. Therefore, humidity data within the pipeline being measured can be collected for appropriate compensation. The method of humidity compensation for corresponding concentration can be a specific proportional relationship or an existing temperature and humidity compensation model reflecting the compensation relationship between humidity and concentration. In this model, humidity is input into the temperature and humidity compensation model, and the concentration output by the model is the compensated concentration. Specifically, the gas sampling device, wind speed sensor, temperature sensor, pressure sensor, and humidity sensor can all be connected to a controller via wires. The controller calculates the gas concentration and flux based on the data collected by the gas sampling device, wind speed sensor, temperature sensor, pressure sensor, and humidity sensor. It should be noted that the controller, gas sampling device, wind speed sensor, temperature sensor, pressure sensor, and humidity sensor in this embodiment are all physical structural components. The controller integrates existing known programs. This embodiment does not involve any modification or use of computer programs; it only provides the connection relationship between the controller, gas sampling device, wind speed sensor, temperature sensor, pressure sensor, and humidity sensor.

[0073] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0074] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0075] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0076] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A gas sampling device for pipelines, characterized in that, include: Sampling gun and connector (3); The connecting seat (3) is installed on the sampling hole (2) of the pipe (1) being tested. The inner cavity of the connecting seat (3) is provided with a sealing seat (4). The sealing seat (4) is provided with a sealing channel, which is connected to the sampling hole (2). The sampling gun includes a sampling tube (7), a sealing plug (8) and a sealing cap (9). The sealing plug (8) and the sealing cap (9) are fitted on the side of the sampling tube (7) near the air outlet. The sealing plug (8) matches the shape of the sealing channel. The sealing cap (9) is located on the side of the sealing plug (8) away from the air inlet of the sampling tube (7). The sampling tube (7) extends through the sealed channel into the inside of the pipe (1) being tested, the sealing plug (8) abuts against the inner wall of the sealed channel, and the sealing cap (9) is detachably connected to the connecting seat (3).

2. The gas sampling device according to claim 1, characterized in that, The sealing seat (4) includes a support plate (10) and a rubber ring (11); The support plate (10) is fixedly connected to the connecting seat (3). The support plate (10) has a through hole for the sampling tube (7) to pass through. The rubber ring (11) is located on the side of the support plate (10) away from the pipe (1) being tested, and the outer diameter of the rubber ring (11) is the same as the inner diameter of the connecting seat (3).

3. The gas sampling device according to claim 2, characterized in that, The inner cavity of the rubber ring (11) is frustum-shaped, and the inner diameter of the end of the rubber ring (11) facing the support plate (10) is smaller than the inner diameter of the end away from the support plate (10).

4. The gas sampling device according to claim 3, characterized in that, The sealing plug (8) is a frustum-shaped soft plug, and the diameter of the side of the sealing plug (8) facing the air inlet end of the sampling tube (7) is smaller than the diameter of the side facing away from the air inlet end of the sampling tube (7).

5. The gas sampling device according to claim 3, characterized in that, The through hole is a round hole, and the diameter of the through hole is smaller than the diameter of the sealing plug (8) on the side facing the air inlet end of the sampling tube (7).

6. The gas sampling device according to claim 1, characterized in that, The sealing plug (8) has an anti-corrosion layer on its end face facing the air inlet end of the sampling tube (7).

7. The gas sampling device according to claim 1, characterized in that, The sealing cap (9) is threadedly connected to the connecting seat (3).

8. The gas sampling device according to claim 1, characterized in that, The sampling gun also includes a sampling head (14) and a counterweight (15); The sampling head (14) is located at the air outlet of the sampling tube (7), and the counterweight (15) is located at the air inlet of the sampling tube (7).

9. The gas sampling device according to claim 8, characterized in that, A threaded sleeve (16) is fixedly installed on the outer wall of the air inlet end of the sampling tube (7). The outer circumferential surface of the threaded sleeve (16) is provided with an external thread. The counterweight (15) is provided with an inner hole. The inner wall of the inner hole is provided with an internal thread. The internal thread of the inner hole of the counterweight (15) is engaged with the external thread on the threaded sleeve (16).

10. A gas flux detection device for pipelines, characterized in that, Includes a wind speed sensor (17) and a gas sampling device according to any one of claims 1 to 9; The wind speed sensor (17) is equipped with a probe (18), which penetrates the sealing cover (9) and the sealing plug (8) and extends into the pipe (1) being measured.

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