A natural gas pipeline sampling device

Abstract

The application relates to the technical field of sampling devices, and discloses a natural gas pipeline sampling device which can be matched with natural gas to realize multi-point continuous sampling, form multi-period continuous sampling in the time dimension, and has more representative samples, stronger practicability, automatic sampling operation and stronger operability. The natural gas pipeline sampling device comprises a natural gas pipeline and a rotary sampling system. The natural gas pipeline is provided with a sampling piece. The rotary sampling system comprises an external air inlet pipe and an external air outlet pipe. The external air inlet pipe and the external air outlet pipe are detachably communicated with the sampling piece. An installation shell is fixedly connected between the external air inlet pipe and the external air outlet pipe. A sample storage bottle is detachably installed outside the installation shell. The bottle opening of the sample storage bottle is communicated with the internal cavity of the installation shell and used for storing natural gas discharged from the sampling pipe. A rotary body is rotationally connected in the installation shell. Two sampling pipes are arranged in the rotary body. A one-way valve is arranged on each of the two sampling pipes. A servo motor and a piston extrusion assembly are installed outside the installation shell.

Description

Technical Field

[0001] This invention relates to the field of sampling device technology, and specifically to a natural gas pipeline sampling device. Background Technology

[0002] As is well known, natural gas pipeline sampling is a crucial step in ensuring gas quality, safe transportation, and metering. Sampling is used to analyze key indicators such as natural gas composition, calorific value, and sulfur content, which directly affect combustion performance and environmental compliance. Sampling must avoid pollution and leakage, and ensure that the sample accurately reflects the gas state inside the pipeline. Therefore, to facilitate the sampling of natural gas in natural gas pipelines, we propose a natural gas pipeline sampling device.

[0003] A search revealed that Chinese patent application CN201810611363.7 discloses a natural gas pipeline sampling device. Its general description includes a sampling device installed on a natural gas pipeline. The natural gas pipeline has a recessed annular cavity, which the sampling device seals. A small outlet hole is opened on the bottom surface of the annular cavity, and the inlet end of the outlet hole communicates with the gas transmission channel in the natural gas pipeline. The sampling device includes a rotating ring with a rotating cavity in the middle. The inner wall of the rotating cavity is in sealed contact with the bottom surface of the annular cavity. The outer wall of the rotating ring protrudes from the outside of the natural gas pipeline. One or more sampling holes are arranged around the protruding end of the rotating ring, and a sampling tube is inserted into each sampling hole. The sampling tube communicates with the gas transmission channel through an outlet pipe. Furthermore, Chinese patent application CN202311536773.7 discloses... A sampling device for a natural gas pipeline is described as follows: it includes a connecting component, an inner spring column assembly, an outer rotating sleeve assembly, an elastic adapter assembly, and a limiting sampling assembly. It is connected to the main natural gas pipeline via a flange base. In the non-sampling state, under the action of the inner top spring, the inner limiting ring is in a position that compresses and seals the top sealing ring. During use, as the sampling connector is inserted into the inner hole of the adapter column, the buckle at the bottom of the locking arm forms a secure engagement with the groove on the outer side of the outer adapter seat, pushing the adapter column downwards into place. The opening and closing rack, in cooperation with the opening and closing gear, opens the valve core. Subsequently, as the outer rotating sleeve rotates into place, the positioning spring elastically engages in the positioning groove, and the bottom end of the adapter column pushes the bidirectional shearing seat downwards into place. The natural gas inside the flange base enters the sampling bottle through the sampling connector. As the sampling bottle is detached, the opening and closing rack springs back, and the valve core automatically closes.

[0004] Although both of the above-mentioned existing technical solutions can perform sampling operations relative to gas pipelines, the natural gas transported in the natural gas pipelines is in a pressurized gaseous state. Therefore, once the sampling equipment is connected to the natural gas pipeline, the natural gas in the pipeline will quickly fill the container in the sampling equipment. Since the natural gas in the pipeline is in a flowing state, the sampling representativeness of the above technical solutions needs to be further improved. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a natural gas pipeline sampling device that can adapt to natural gas sampling scenarios to achieve multi-point continuous sampling and form multi-time period continuous sampling in the time dimension. The samples obtained are more representative and more practical, and the sampling operation can be completed automatically, significantly improving operability.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a natural gas pipeline sampling device, comprising a natural gas pipeline, a sampling element installed on the natural gas pipeline, and a rotary sampling system, the rotary sampling system comprising an external inlet pipe and an external outlet pipe, both of which are detachably connected to the sampling element. A mounting shell is fixedly connected between the external inlet pipe and the external outlet pipe. A sample storage bottle is detachably installed outside the mounting shell, the bottle opening of which is connected to the internal cavity of the mounting shell for storing natural gas discharged from the sampling pipe. A rotary body is rotatably connected inside the mounting shell, and two sampling pipes are disposed within the rotary body. Each of the two sampling pipes is equipped with a one-way valve. A servo motor and a piston compression assembly are installed outside the mounting shell. The servo motor drives the rotation of the rotary body, and the piston compression assembly compresses and introduces the sampled gas from the sampling pipes into the sample storage bottle. A sampling guide assembly is installed on the external inlet pipe, which guides the natural gas at different flow positions within the natural gas pipeline.

[0007] Preferably, the sampling guide assembly includes an external mounting tube, which is fixedly connected to the external air inlet pipe and communicates with it. A first electric telescopic rod is mounted on the outside of the external mounting tube. The actuator of the first electric telescopic rod is driven by an inclined sampling tube. The inclined sampling tube is slidably fitted inside the external mounting tube, and a sliding seal is provided between the inclined sampling tube and the external mounting tube. The inclined sampling tube has a vent, and a sealing blind plate is fixedly connected to the top of the inclined sampling tube. A sealing cap is detachably threaded to the top of the external mounting tube.

[0008] Preferably, the piston extrusion assembly includes a second electric telescopic rod, which is installed outside the mounting housing. A piston rod is drivenly connected to the actuator of the second electric telescopic rod. A seal is fitted over the piston rod and is fixedly connected to the outside of the mounting housing. A piston body is fixedly installed at the rear end of the piston rod and matches the sampling tube.

[0009] A transmission plate is fixedly connected to both the closed blind plate and the piston rod, and the two transmission plates are respectively fixedly connected to the actuators of the first electric telescopic rod and the second electric telescopic rod.

[0010] Preferably, a push column is fixedly connected to the front end of the piston body. The push column is equipped with a pressure sensor. The pressure sensor is installed outside the seal, and the seal is provided with a through hole that matches the push column. When the piston body moves forward to the limit position, the push column passes through the through hole and squeezes the pressure sensor. The pressure sensor sends a signal to the controller that controls the servo motor to start the servo motor to switch the sampling tube.

[0011] Preferably, the sampling component includes a pipe section of the same diameter, which is fixedly connected to a natural gas pipeline via a flange ring. An external inclined guide pipe and an internal inclined guide pipe are connected to the pipe section of the same diameter. A control valve is installed on both the external and internal inclined guide pipes, and the two control valves are respectively connected to the external air inlet pipe and the external air outlet pipe.

[0012] Preferably, the sample storage bottle has a threaded inner sleeve at the bottle mouth, the threaded inner sleeve is fitted with an external threaded tube, the external threaded tube is fixedly connected to the mounting shell, an external prismatic tube is fixedly connected inside the sample storage bottle, a threaded column is rotatably connected inside the external prismatic tube, a sealing plug is threadedly connected to the threaded column, an inner prismatic tube is fixedly connected to the sealing plug, and the inner prismatic tube is slidably connected to the external prismatic tube.

[0013] Preferably, a sealing sleeve is fixedly connected to the outside of the sample storage bottle, and an external hexagonal drive post is rotatably connected inside the sealing sleeve. The external hexagonal drive post is fixedly connected to the threaded post.

[0014] Preferably, the sample storage bottle is fixedly connected to a support and protective frame, and the external hexagonal drive column is disposed inside the support and protective frame.

[0015] Preferably, the bottom end of the inclined sampling tube is provided with a wedge-shaped surface, and the wedge-shaped surface is oriented towards the side where the natural gas flows in.

[0016] Compared with the prior art, the present invention provides a natural gas pipeline sampling device, which has the following beneficial effects: (1). In this invention, the design of the sampling component allows for connection and adaptation with natural gas pipelines without affecting the normal transportation operation of the natural gas pipelines, while also enabling the installation of other operating equipment of this natural gas sampling device.

[0017] (2). In this invention, by equipping a rotary sampling system, a natural gas flow channel can be constructed in conjunction with the sampling component to ensure the reliability of the sample taken.

[0018] (3). In this invention, the design of the piston extrusion assembly enables the natural gas in the sampling pipe to be actively extruded and discharged, so that the natural gas in the sampling pipe can enter the sample storage bottle, thereby realizing the storage and continuous collection of the sampled gas.

[0019] (4). In this invention, the sampling points in the natural gas pipeline can be adjusted by the design of the sampling guide component, which can be adapted to natural gas pipelines with larger inner diameters to achieve multi-point sampling on the flow surface inside the pipe. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram showing a partial cross-section of the present invention; Figure 2 For the present invention Figure 1 A magnified schematic diagram of the partial structure at point A in the middle; Figure 3 For the present invention Figure 1 A magnified schematic diagram of the local structure at point B; Figure 4 This is a partial cross-sectional three-dimensional structural schematic diagram of the sample storage bottle, threaded inner sleeve, and outer prismatic tube of the present invention. Figure 5 This is a three-dimensional structural diagram of the entire invention; Figure 6 This is a three-dimensional structural diagram of the combination of the obliquely inserted sampling tube, the closed blind plate, and the transmission plate of the present invention; Figure 7 This is a three-dimensional structural diagram of the piston rod, piston body, and push column of the present invention. Figure 8 This is a three-dimensional structural diagram of the mounting shell, the first electric telescopic rod, and the seal of the present invention. Figure 9 This is a three-dimensional structural diagram of the entire invention from a rear side view; Figure 10 For the present invention Figure 9 A magnified schematic diagram of the local structure at point D; Figure 11 This is a three-dimensional structural diagram of the invention viewed from below. Figure 12 This is a three-dimensional structural schematic diagram of the opening shape of the air vent on the obliquely inserted sampling tube of the present invention; Figure 13 This is a three-dimensional structural diagram of the mounting shell, the second electric telescopic rod, and the external threaded pipe of the present invention. Figure 14 This is a three-dimensional structural diagram of the sealing plug and the inner prismatic tube of the present invention. Figure 15 This is a three-dimensional structural diagram showing the interaction and disassembly of the mounting shell and the rotating body of the present invention.

[0021] In the diagram: 1. Natural gas pipeline; 2. External inlet pipe; 3. External exhaust pipe; 4. Mounting housing; 5. Sample storage bottle; 6. Rotary body; 7. Sampling pipe; 8. One-way valve; 9. Servo motor; 10. External mounting pipe; 11. First electric telescopic rod; 12. Angled sampling tube; 13. Vent inlet; 14. Sealing blind flange; 15. Sealing cap; 16. Second electric telescopic rod; 17. Piston rod; 18. Seal; 19. 20. Piston body; 21. Transmission plate; 22. Push column; 23. Pressure sensor; 24. Same diameter pipe section; 25. External inclined guide tube; 26. Internal inclined guide tube; 27. Control valve; 28. Threaded inner sleeve; 29. ​​External threaded pipe; 30. External prismatic pipe; 31. Threaded column; 32. Sealing plug; 33. Internal prismatic pipe; 34. Sealing sleeve; 35. External hexagonal drive column; 36. Support and protective frame; 37. Wedge-shaped surface. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] For examples, please refer to Figures 1-15A natural gas pipeline sampling device includes a natural gas pipeline 1, a sampling element installed on the natural gas pipeline 1, and a rotary sampling system. The rotary sampling system includes an external inlet pipe 2 and an external exhaust pipe 3, both of which are detachably connected to the sampling element. A mounting shell 4 is fixedly connected between the external inlet pipe 2 and the external exhaust pipe 3. A sample storage bottle 5 is detachably installed outside the mounting shell 4. The bottle opening of the sample storage bottle 5 is connected to the internal cavity of the mounting shell 4 for storing natural gas discharged from the sampling pipe 7. A threaded inner sleeve 27 is provided at the bottle opening of the sample storage bottle 5. An external threaded tube 28 is threadedly fitted to the threaded inner sleeve 27 and fixedly connected to the mounting shell 4. An external prismatic tube 29 is fixedly connected inside the sample storage bottle 5. A threaded column 30 is rotatably connected inside the external prismatic tube 29. A sealing plug 31 is threadedly connected to the threaded column 30. An inner prismatic tube 32 is fixedly connected to the outer prismatic tube 29. The inner prismatic tube 32 and the outer prismatic tube 29 are slidably connected. Through the sliding engagement of the inner prismatic tube 32 and the outer prismatic tube 29, the sealing plug 31 can be restricted to rotate synchronously with the threaded column 30. When the threaded column 30 rotates, the relative thread adjustment between the threaded column 30 and the sealing plug 31 can be ensured, so as to realize the insertion or removal adjustment of the sealing plug 31 relative to the threaded inner sleeve 27. A sealing sleeve 33 is fixedly connected to the outside of the sample bottle 5. An outer hexagonal drive column 34 is rotatably connected inside the sealing sleeve 33. The outer hexagonal drive column 34 is fixedly connected to the threaded column 30, which facilitates the rotation of the threaded column 30 from the outside of the sample bottle 5. A support and protective frame 35 is fixedly connected to the outside of the sample bottle 5. The outer hexagonal drive column 34 is set inside the support and protective frame 35, which ensures that the sample bottle 5 can be placed vertically and also forms a structural protection for the outer hexagonal drive column 34.

[0024] It should be further explained that a gyroscopic body 6 is rotatably connected inside the mounting housing 4. Two sampling pipes 7 are installed inside the gyroscopic body 6, each equipped with a one-way valve 8. A servo motor 9 and a piston compression assembly are installed outside the mounting housing 4. The servo motor 9 drives the rotation of the gyroscopic body 6. With the gyroscopic sampling system, a natural gas flow channel can be constructed in conjunction with the sampling components, ensuring the reliability of the collected samples. The piston compression assembly includes a second electric telescopic rod 16, which is installed outside the mounting housing 4. A piston rod 17 is drivenly connected to the actuator of the second electric telescopic rod 16. A seal 18 is fitted over the piston rod 17 and is fixedly connected to the mounting housing. 4. In addition, a piston body 19 is fixedly installed at the rear end of the piston rod 17. The piston body 19 is matched with the sampling pipe 7. Through the design of the piston extrusion assembly, the natural gas in the sampling pipe 7 can be actively extruded and discharged, and finally the natural gas in the sampling pipe 7 enters the sample storage bottle 5, realizing the storage and continuous collection of the sampled gas. The piston extrusion assembly is used to extrude the sampled gas in the sampling pipe 7 into the sample storage bottle 5. A sampling guide assembly is installed on the external inlet pipe 2. The sampling guide assembly is used to guide the natural gas at different flow positions in the natural gas pipeline 1. The sampling guide assembly includes an external installation pipe 10, which is fixedly connected to the external inlet pipe 2. The external inlet pipe 2 is also fixedly connected to the external installation pipe 10. The external mounting tube 10 is connected to the external mounting tube 10, and a first electric telescopic rod 11 is installed on the outside of the external mounting tube 10. The actuator of the first electric telescopic rod 11 is connected to an inclined sampling tube 12. The inclined sampling tube 12 is slidably fitted inside the external mounting tube 10, and a sliding seal is provided between the inclined sampling tube 12 and the external mounting tube 10. This sliding seal can be similar to the O-ring seal in a piston. Specifically, an annular sealing groove is opened on the outside of the inclined sampling tube 12, and an O-ring rubber seal is installed in the annular sealing groove. The O-ring rubber seal slides in contact with the inner wall of the external mounting tube 10, and the seal is achieved by pre-compression. Since there are various forms of sliding seals in the prior art, in addition to the aforementioned sealing example, other methods can also be used. Using other existing sealing methods, it is only necessary to achieve a sliding seal between the inclined sampling tube 12 and the external installation tube 10. The inclined sampling tube 12 has a vent 13. The top end of the inclined sampling tube 12 is fixedly connected to a blind plate 14. The top end of the external installation tube 10 is detachably threadedly connected to a cap 15. Through the design of the sampling guide component, the sampling point in the natural gas pipeline 1 can be adjusted to adapt to the natural gas pipeline 1 with a larger inner diameter, so as to achieve multi-point sampling on the flow surface inside the pipe. The bottom end of the inclined sampling tube 12 is provided with a wedge-shaped surface 36, and the wedge-shaped surface 36 is set towards the side where the natural gas flows in, which improves the effect of guiding the flowing natural gas into the inclined sampling tube 12.

[0025] Furthermore, the sampling device includes a pipe section 23 of the same diameter, which is fixedly connected to the natural gas pipeline 1 via a flange ring. An external inclined guide pipe 24 and an internal inclined guide pipe 25 are connected to the pipe section 23. Both the external and internal inclined guide pipes 24 and 25 are equipped with control valves 26, which are respectively connected to the external inlet pipe 2 and the external exhaust pipe 3. Through the design of the sampling device, it can be connected and adapted to the natural gas pipeline 1 without affecting the normal transportation operation of the natural gas pipeline 1. Simultaneously, it allows for the installation of other operating equipment of this natural gas sampling device. The front end of the piston body 19 is fixed... A push column 21 is fixedly connected, and a pressure sensor 22 is matched with the push column 21. The pressure sensor 22 is installed outside the seal 18, and the seal 18 is provided with a through hole that matches the push column 21. When the piston body 19 moves forward to the limit position, the push column 21 passes through the through hole and squeezes the pressure sensor 22. The pressure sensor 22 sends a signal to the controller that controls the servo motor 9, which is used to control the servo motor 9 to start and switch the sampling tube 7. A transmission plate 20 is fixedly connected to both the blind plate 14 and the piston rod 17. The two transmission plates 20 are fixedly connected to the actuators of the first electric telescopic rod 11 and the second electric telescopic rod 16, respectively.

[0026] The servo motor, one-way valve, first electric telescopic rod, second electric telescopic rod, pressure sensor, and control valve in this embodiment are all commercially available conventional devices known to those skilled in the art. In this invention, we are simply using them without modifying their structure or function. Their setting method, installation method, and electrical connection method can be easily explained by those skilled in the art by following the instructions for use. Therefore, we will not elaborate on them here.

[0027] In summary, the working principle of this natural gas pipeline sampling device is as follows: Before use, the sampling component is first installed on the natural gas pipeline 1. If the installation is during the overall construction phase of the natural gas pipeline 1 and the natural gas pipeline 1 is not yet in operation, a suitable location and space on the natural gas pipeline 1 can be directly selected for installation. If the natural gas pipeline 1 is already in use, the natural gas in the natural gas pipeline 1 should be emptied before installation. The same diameter pipe section 23 in the sampling component is aligned with the corresponding port of the natural gas pipeline 1 through the flange rings at both ends and fixedly installed. After installation, both control valves 26 should be in the closed state. The control valves 26 should be equipped with conspicuous signs indicating whether they are open or closed to ensure that the status of the control valves 26 is clear. In actual use, the same diameter pipe section 23 can provide auxiliary guidance for the natural gas in the natural gas pipeline 1 to ensure the normal transportation of natural gas by the natural gas pipeline 1. The external inlet pipe 2 is connected to the external inclined guide pipe 24, and the external exhaust pipe 3 is connected to the internal inclined guide pipe. 25. During the docking process, ensure precise fit of the pipe interface and keep both control valves 26 closed to prevent natural gas leakage during subsequent commissioning. Next, install the sample storage bottle 5. Align the threaded inner sleeve 27 of the sample storage bottle 5 with the external threaded tube 28 on the mounting shell 4 and slowly screw it in. During the screwing process, observe the sealing status to ensure that the sample storage bottle 5 is connected to the internal cavity of the mounting shell 4 and is well sealed. Then, use an externally compatible hex wrench to rotate the external hexagonal drive column 34. The external hexagonal drive column 34 drives the threaded column 30 fixedly connected to it to rotate synchronously. Since the external prismatic tube 29 inside the sample storage bottle 5 and the internal prismatic tube 32 connected to the sealing plug 31 form a sliding fit, the sealing plug 31 can be effectively restricted from rotating synchronously with the threaded column 30. Under this limiting action, the threaded column 30 and the sealing plug 31 undergo relative threaded movement, thereby driving the sealing plug 31 to be pulled out and adjusted relative to the threaded inner sleeve 27, so that the inside of the sample storage bottle 5 is smoothly connected to the internal cavity of the mounting shell 4, preparing for the subsequent introduction and storage of sampled gas.

[0028] Next, control circuits are installed for the servo motor 9, the first electric telescopic rod 11, the second electric telescopic rod 16, and the pressure sensor 22. The coordinated operation control, adjustment, and testing of these components are then performed. During the coordinated operation of the servo motor 9 and the second electric telescopic rod 16, when the second electric telescopic rod 16 controls the piston rod 17 to move forward, it drives the push column 21 forward via the piston body 19. When the push column 21 moves forward to its limit position, it exerts a squeezing effect on the pressure sensor 22, causing it to generate a reading signal. In this state, the piston body 19 completely exits the sampling tube 7. When the servo motor 9 drives the rotary body 6 to rotate, it will not... Interference occurs with piston body 19. When pressure sensor 22 does not generate a corresponding reading signal, servo motor 9 cannot operate, and gyro 6 will not rotate. Therefore, gyro 6 will not interfere with piston body 19, resulting in better operational safety. In actual testing, both control valves 26 are fully opened, and then servo motor 9 is controlled to run. The output shaft of servo motor 9 drives gyro 6 to rotate within mounting housing 4 until the two ends of one of the sampling pipes 7 within gyro 6 are aligned with the corresponding interfaces of external inlet pipe 2 and external exhaust pipe 3, forming a natural gas flow channel. In this state, the inclined sampling pipe 12, external inclined guide pipe 24, external inlet pipe 2, mounting housing 4, sampling pipe 7, external exhaust pipe 3, and internal inclined guide pipe 25 work together to form a natural gas flow channel. This forms a separate ventilation pipeline from the same-diameter pipeline section 23. Natural gas flowing within the same-diameter pipeline section 23 can also partially enter this ventilation pipeline. When the sampling point position within the natural gas pipeline 1 needs adjustment, the first electric telescopic rod 11 is activated. The actuator of the first electric telescopic rod 11, via a transmission plate 20 fixedly connected to it, drives the inclined sampling tube 12 to slide axially within the external installation pipe 10. During the sliding process, the wedge-shaped surface 36 is always kept facing the side where natural gas flows in. The operator observes the insertion depth of the inclined sampling tube 12 in real time according to the preset sampling position parameters based on the inner diameter of the natural gas pipeline 1, until the bottom end of the inclined sampling tube 12 is at the target flow position within the natural gas pipeline 1. The wedge-shaped surface 36 is then used to... The guiding effect of the pipe enhances the guidance of natural gas to the inlet 13. During this process, the sliding sealing structure between the external installation pipe 10 and the inclined sampling pipe 12 continues to function, effectively preventing natural gas leakage from the gap between them. After the sampling point is adjusted to the correct position, the first electric telescopic rod 11 is stopped, and the inclined sampling pipe 12 remains in its current position. Under its own pressure and flow, the natural gas in the natural gas pipeline 1 enters the external inlet pipe 2 through the external inclined guide pipe 24, then flows into the connected sampling pipe 7, and finally returns to the natural gas pipeline 1 through the internal inclined guide pipe 25, forming a stable natural gas flow loop. This loop ensures that the natural gas in the sampling pipe 7 operates under the same conditions as the mainstream natural gas in the same diameter pipeline section 23.This ensures the reliability of the samples taken.

[0029] After the natural gas in the sampling tube 7 reaches a stable flow state, the servo motor 9 is restarted to drive the rotation of the gyroscope 6, so that the two sampling tubes 7 in the gyroscope 6 are switched. Since natural gas is initially introduced into the lower sampling tube 7, after the two sampling tubes 7 are switched, the natural gas introduced into the upper sampling tube 7 is adjusted to the height corresponding to the sample storage bottle 5. After the gyroscope 6 has rotated 180 degrees, the servo motor 9 enters the parking state again, controlling the second electric telescopic rod 16 to start running. The actuator of the second electric telescopic rod 16 drives the piston rod 17 to move axially through the transmission plate 20. The piston rod 17 pushes the piston body 19, which is fixed to it, to move in the same direction in the sampling tube 7. After the piston body 19 enters the sampling tube 7, it forms a tight fit with the inner wall of the sampling tube 7. Therefore, the movement of the piston body 19 within the sampling tube 7 can actively squeeze and discharge the natural gas inside the sampling tube 7. The squeezed natural gas then enters the sample storage bottle 5 through the guide channel inside the mounting shell 4, thus storing the sampled gas. When the piston body 19 moves backward to its limit position, the sampling work of the current sampling tube 7 can be determined by a preset program. Subsequently, the second electric telescopic rod 16 controls the piston body 19 to move forward and reset. Since a one-way valve 8 is installed inside the sampling tube 7, the natural gas inside the sampling tube 7 can be smoothly squeezed and transported into the sample storage bottle 5 during the backward movement of the piston body 19. During the forward movement of the piston body 19... Natural gas already in the sample storage bottle 5 will not flow back. Since the position of the two sampling tubes 7 has switched, the newly entered lower sampling tube 7 will also connect to the flow loop of the external inlet pipe 2. When the piston body 19 moves forward and resets, and the pressure sensor 22 generates a corresponding reading signal, the servo motor 9 starts again, driving the rotary body 6 to rotate, thus switching the two sampling tubes 7 again. Then, starting the second electric telescopic rod 16 again allows the natural gas sampled in the next time period to be introduced into the sample storage bottle 5, achieving continuous natural gas sample collection. If, during sampling, the first electric telescopic rod 11 continuously adjusts the angled sampling tube 12, multi-point sampling of natural gas can be achieved for natural gas pipelines with larger inner diameters 1. In the actual sampling process, if only a natural gas sample is to be collected at a certain point or at a certain time, then only the natural gas in one sampling tube 7 needs to be squeezed into the sample storage bottle 5. When sampling again, the sample storage bottle 5 needs to be replaced accordingly. When replacing the sample storage bottle 5, the rotation of the threaded column 30 is achieved by rotating the external hexagonal drive column 34, which ultimately achieves the insertion of the sealing plug 31 relative to the threaded inner sleeve 27 to seal the bottle mouth of the sample storage bottle 5. After that, the sample storage bottle 5 can be removed and replaced. If the natural gas sample to be collected is more representative in terms of time and space, then the position of the inclined sampling tube 12 needs to be adjusted in stages, and the two sampling tubes 7 are used to sample repeatedly in sequence, and the natural gas sampled in multiple samplings is squeezed into the sample storage bottle 5 in sequence.

[0030] After sampling is completed, the first electric telescopic rod 11 controls the oblique insertion sampling tube 12 to be pulled out relative to the same diameter pipe section 23 and completely retracted into the external installation pipe 10. Then, the control valves 26 on the external oblique insertion guide tube 24 and the internal oblique insertion guide tube 25 are closed. The closing process is carried out at a constant speed to prevent the residual gas in the pipe from rapidly depressurizing and causing impact. The second electric telescopic rod 16 controls the piston body 19 to move forward and reset. Then, the servo motor 9 drives the rotation of the gyratory body 6 so that both sampling tubes 7 are aligned with the external air inlet pipe 2. Misalignment is prevented because the front and rear ends of the gyratory body 6 are equipped with rotational contact seals on both sides of the mounting shell 4. Therefore, natural gas in the sampling pipe 7 will not leak in this state. The specific form of this rotational contact seal can be similar to that of a water pump or gas pump bearing seal, such as an end-face sealing. This involves machining the front and rear ends of the gyratory body 6 and the two inner end faces of the mounting shell 4 to a high precision, forming an end-face rotational seal through the pressing and bonding of these high-precision planes. Alternatively, a rectangular rubber end-face sealing ring can be added between the gyratory body 6 and the mounting shell 4 to achieve this. The current sealing method involves creating annular grooves on both the front and rear ends of the rotating body 6, and placing a rectangular rubber end-face sealing ring into each groove. The rectangular rubber end-face sealing ring then abuts against the inner end face of the mounting shell 4. As the rotating body 6 rotates, the seal is achieved through friction between the end face of the rectangular rubber end-face sealing ring and the mounting shell 4. Since there are various rotational contact sealing methods in the prior art, other existing sealing methods can be used besides the aforementioned sealing example, as long as the seal between the rotating body 6 and the mounting shell 4 is achieved. The sample storage bottle 5 can be removed and stored using supports. The protective frame 35 ensures stable vertical placement, while the frame structure supporting the protective frame 35 forms a surrounding protection for the hexagonal drive column 34, preventing unnecessary collisions or compression damage to the hexagonal drive column 34 during subsequent handling or storage. In actual natural gas transportation scenarios, the inner diameter of the main pipeline is usually large. Therefore, designing the diameter of the external inlet pipe 2 to be smaller can effectively control the airflow velocity and reduce turbulence disturbances. This reduces the risk of leakage and pressure fluctuations in the natural gas collection and transportation process, without significantly affecting the overall transportation efficiency of natural gas.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A natural gas pipeline sampling device, comprising a natural gas pipeline (1), wherein a sampling element is installed on the natural gas pipeline (1), characterized in that, It also includes a cyclone sampling system, which includes an external inlet pipe (2) and an external exhaust pipe (3). The external inlet pipe (2) and the external exhaust pipe (3) are detachably connected to the sampling component. An installation shell (4) is fixedly connected between the external inlet pipe (2) and the external exhaust pipe (3). A sample storage bottle (5) is detachably installed outside the installation shell (4). The bottle mouth of the sample storage bottle (5) is connected to the internal cavity of the installation shell (4) for storing the natural gas discharged from the sampling pipe (7). A cyclone body (6) is rotatably connected inside the installation shell (4). The gyro (6) is provided with two sampling pipes (7), and each of the two sampling pipes (7) is equipped with a one-way valve (8). A servo motor (9) and a piston extrusion assembly are installed outside the mounting shell (4). The servo motor (9) is used to drive the rotation of the gyro (6), and the piston extrusion assembly is used to extrude the sampling gas in the sampling pipe (7) into the sample storage bottle (5). A sampling guide assembly is installed on the external air inlet pipe (2), and the sampling guide assembly is used to guide the natural gas at different flow positions in the natural gas pipeline (1).

2. The natural gas pipeline sampling device according to claim 1, characterized in that, The sampling guide assembly includes an external mounting tube (10), which is fixedly connected to the external air inlet tube (2) and the external air inlet tube (2) is connected to the external mounting tube (10). A first electric telescopic rod (11) is installed on the outside of the external mounting tube (10). The actuator of the first electric telescopic rod (11) is connected to an inclined sampling tube (12). The inclined sampling tube (12) is slidably fitted inside the external mounting tube (10), and a sliding seal is provided between the inclined sampling tube (12) and the external mounting tube (10). The inclined sampling tube (12) has an air vent (13). A closed blind plate (14) is fixedly connected to the top end of the inclined sampling tube (12). A closed cap (15) is detachably threaded to the top end of the external mounting tube (10).

3. A natural gas pipeline sampling device according to claim 2, characterized in that, The piston extrusion assembly includes a second electric telescopic rod (16), which is installed outside the mounting shell (4). A piston rod (17) is drivenly connected to the actuator of the second electric telescopic rod (16). A seal (18) is fitted over the piston rod (17), which is fixedly connected to the mounting shell (4). A piston body (19) is fixedly installed at the rear end of the piston rod (17), and the piston body (19) matches the sampling tube (7).

4. A natural gas pipeline sampling device according to claim 3, characterized in that, A transmission plate (20) is fixedly connected to both the closed blind plate (14) and the piston rod (17). The two transmission plates (20) are fixedly connected to the actuators of the first electric telescopic rod (11) and the second electric telescopic rod (16), respectively.

5. A natural gas pipeline sampling device according to claim 4, characterized in that, The piston body (19) is fixedly connected to a push column (21) at its front end. The push column (21) is equipped with a pressure sensor (22). The pressure sensor (22) is installed outside the seal (18). The seal (18) is provided with a through hole that matches the push column (21). When the piston body (19) moves forward to its limit position, the push column (21) passes through the through hole and squeezes the pressure sensor (22). The pressure sensor (22) sends a signal to the controller that controls the servo motor (9) to start the servo motor (9) to switch the sampling tube (7).

6. A natural gas pipeline sampling device according to claim 5, characterized in that, The sampling component includes a pipe section (23) of the same diameter, which is fixedly connected to the natural gas pipeline (1) through a flange ring. An external inclined guide pipe (24) and an internal inclined guide pipe (25) are connected to the pipe section (23). A control valve (26) is installed on both the external inclined guide pipe (24) and the internal inclined guide pipe (25). The two control valves (26) are respectively connected to the external air inlet pipe (2) and the external exhaust pipe (3).

7. A natural gas pipeline sampling device according to claim 6, characterized in that, The sample storage bottle (5) is provided with a threaded inner sleeve (27) at the bottle mouth. The threaded inner sleeve (27) is matched with an external threaded tube (28). The external threaded tube (28) is fixedly connected to the mounting shell (4). An external prismatic tube (29) is fixedly connected inside the sample storage bottle (5). A threaded column (30) is rotatably connected inside the external prismatic tube (29). A sealing plug (31) is threadedly connected to the threaded column (30). An inner prismatic tube (32) is fixedly connected to the sealing plug (31). The inner prismatic tube (32) is slidably connected to the external prismatic tube (29).

8. A natural gas pipeline sampling device according to claim 7, characterized in that, The sample storage bottle (5) is fixedly connected to a sealing sleeve (33), and an external hexagonal drive post (34) is rotatably connected inside the sealing sleeve (33). The external hexagonal drive post (34) is fixedly connected to the threaded post (30).

9. A natural gas pipeline sampling device according to claim 8, characterized in that, The sample storage bottle (5) is fixedly connected to a support and protective frame (35), and the external hexagonal drive column (34) is located inside the support and protective frame (35).

10. A natural gas pipeline sampling device according to claim 9, characterized in that, The bottom end of the inclined sampling tube (12) is provided with a wedge-shaped surface (36), and the wedge-shaped surface (36) is set in the direction of the natural gas flow into the tube.

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