Natural gas component analyzing and sampling device

Abstract

The invention discloses a natural gas component analysis sampling device, and relates to the technical field of natural gas sampling analysis, the natural gas component analysis sampling device comprises a control unit, a sampling unit, a carrier gas unit, a temperature control unit and a detection unit, the control unit is used for controlling the sampling unit to obtain a sample and controlling the carrier gas unit to provide carrier gas; meanwhile, the carrier gas can be controlled to drive the sample to move in the detection unit for detection; the sampling unit comprises a sampling strip, a sampling pipe, a driving device and a piston barrel shell, the sampling pipe is rotationally arranged in the sampling strip and rotates through the driving device, the sampling pipe is communicated with the piston barrel shell, the piston barrel shell is provided with a sampling connector and a piston assembly, and the natural gas source pushes the piston assembly to achieve gas compression; through the corresponding design, the natural gas components of the high-pressure natural gas pipeline can be detected in a closed mode, and tedious operation work is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas sampling and analysis, and in particular to a natural gas component analysis sampling device. Background Art

[0002] Existing natural gas sampling analyzers for high-pressure pipelines have many shortcomings in practical applications. Traditional sampling methods usually require natural gas to be extracted from high-pressure pipelines and then transferred to the sample analysis module through a series of pipes and valves. In this process, the transfer of gas samples is not only time-consuming, but also easily affected or contaminated by the external environment, which can cause changes in the composition of the sample, especially the precipitation of heavy hydrocarbons. This precipitation phenomenon will directly affect the accuracy of the analysis results, leading to subsequent mistakes in decision-making. In addition, pressure changes and temperature fluctuations during the sampling process will also affect the physical properties of the gas, increase the complexity of the sample, and greatly reduce the repeatability and reliability of the analysis results.

[0003] In addition, for natural gas from high-sulfur gas wells, the danger of the sampling process cannot be ignored. Due to the corrosiveness and toxicity of high-sulfur gas, improper operation during sampling may pose a serious safety threat to the operator. High-pressure natural gas may leak during the sampling and transfer process, which may not only cause casualties, but also pollute the environment. In addition, existing sampling devices often lack sufficient safety protection measures and cannot effectively prevent the accidental release of high-pressure gas. Therefore, the existing high-pressure natural gas sampling analyzers have obvious deficiencies in terms of safety, ease of operation and accuracy of results, and are in urgent need of improvement and optimization.

[0004] In addition to the complexity and safety hazards mentioned above, existing high-pressure natural gas sampling analyzers are also insufficient in terms of data real-time and automation. Traditional sampling methods often rely on manual operations, resulting in low timeliness of data collection. In a rapidly changing production environment, real-time acquisition of gas composition information is crucial to optimizing the production process and improving economic benefits. However, traditional sampling and analysis systems usually require a long time for sample processing and analysis, which makes it difficult to meet the on-site demand for real-time data. This delay not only affects the timeliness of decision-making, but may also lead to the inability to take corresponding measures in time when the gas composition changes, resulting in economic losses.

[0005] In addition, existing analysis systems usually lack intelligent design and cannot achieve automated operation and intelligent data processing. In modern industry, intelligence and automation are important means to improve work efficiency and reduce human errors. However, many high-pressure natural gas sampling analyzers still rely on manual operation and traditional analysis methods, which increases the workload of operators and the risk of human errors. Therefore, in view of these limitations, it is particularly important to develop an efficient, safe and intelligent online analysis sampling device for natural gas components to improve the accuracy, real-time and safety of gas analysis and promote technological progress in the natural gas industry.

[0006] In summary, the existing high-pressure natural sampling and analysis technology needs to be further improved. Summary of the invention

[0007] The object of the present invention is to provide a natural gas component analysis sampling device to solve some of the above problems.

[0008] The present invention is achieved through the following technical solutions: A natural gas component analysis sampling device comprises a control unit, a sampling unit, a carrier gas unit, a temperature control unit and a detection unit. The control unit is used to control the sampling unit to obtain a sample and control the carrier gas unit to provide a carrier gas. At the same time, the carrier gas can be controlled to drive the sample to move in the detection unit and perform detection. The sampling unit includes a sampling strip, a sampling tube, a driving device and a piston cylinder shell. The sampling tube is rotatably arranged in the sampling strip and rotated by the driving device. The sampling tube is connected to the piston cylinder shell. The piston cylinder shell is provided with a sampling interface and a piston assembly. The natural gas source realizes gas compression by pushing the piston assembly.

[0009] In general, the natural gas component analysis sampling device of the present invention coordinates the work of sampling, carrier gas, temperature control and detection units through a control unit to achieve online monitoring of natural gas pipelines. The sampling unit collects and compresses samples by rotating the sampling tube and piston assembly, the carrier gas unit provides pure nitrogen to push the sample to move, the temperature control unit adjusts the temperature through the vortex tube, and the detection unit analyzes the natural gas components and generates electrical signals to transmit to the terminal. The device has the characteristics of efficient sampling, energy saving and environmental protection, intelligent control and high safety, and is suitable for continuous monitoring and component analysis of natural gas pipelines.

[0010] Preferably, the sampling tube and the sampling strip are oriented in the same direction and are rotatably arranged in the middle of the sampling strip; a connecting cavity shell is fixed at one end of the sampling strip, the sampling tube passes through the connecting cavity shell, and is rotatably connected to a piston cylinder shell arranged at the other end of the connecting cavity shell; a driven gear is coaxially fixed to the sampling tube in the middle cavity position of the connecting cavity shell, the driven gear is meshed with a driving gear, and the driving gear is driven by a correspondingly arranged micro motor; the micro motor drives the driving gear to rotate, thereby driving the driven gear to rotate, and finally drives the sampling tube to rotate in the sampling strip.

[0011] Preferably, the sampling strip is provided with two arc-shaped grooves along its direction, and the two grooves face opposite directions; a plurality of flow guide holes are provided in a linear array along the direction of the sampling strip in the groove, and the flow guide holes are of the same size and penetrate the sampling strip; a cylindrical hole is also provided in the middle of the sampling strip along its direction, and the cylindrical hole is connected to the flow guide holes, and the cylindrical hole is closed away from the connecting cavity shell; the sampling tube is rotatably arranged in the cylindrical hole, and a plurality of sampling holes are provided on one side of its circumference corresponding to the flow guide holes, and the sampling holes are of the same size as the flow guide holes; when the sampling tube rotates, the sampling holes can be connected to or isolated from the corresponding flow guide holes; by providing the arc-shaped grooves, the pressure of the natural gas inside the sampling tube is adjusted (the arc-shaped groove on one side faces the natural gas upstream of the high-pressure pipeline, and a high-pressure area is formed in the arc-shaped groove, and the arc-shaped groove on the back side faces the downstream, and a low-pressure area is formed in the arc-shaped groove. During the rotation of the sampling tube, as the arc-shaped grooves connected to the flow guide holes are different, the natural gas pressure inside the sampling tube will also be different, and it will switch between high and low in a cycle), and the switching of the pressure is used to push the first piston.

[0012] Preferably, one end of the sampling tube rotatably connected to the piston cylinder shell is open and communicated with the first piston chamber of the piston cylinder shell; the piston cylinder shell is provided with a sampling interface, the output end of the sampling interface is connected to a micro-sample bottle, the micro-sample bottle is connected to a first micro-valve, and the input end of the sampling interface is communicated with the first piston chamber; the first piston chamber is provided with a first piston, the piston cylinder shell is also provided with a second piston chamber, and the second piston chamber is provided with a second piston; the first piston and the second piston are connected by a connecting rod, and the first piston pushes the second piston to reciprocate in the second piston chamber; the diameter of the second piston chamber is smaller than that of the first piston chamber, and the side away from the first piston is connected to a micro-tee, and the other two pipes of the micro-tee are respectively connected to the second micro-valve and the third micro-valve; the diameter of the second piston chamber is smaller than that of the first piston chamber, so as to expand the compression ratio of the second piston, and utilize the high-speed high-pressure natural gas flowing in the tube as compression power to save equipment power.

[0013] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The multi-purpose design of the carrier gas unit of the present invention provides higher flexibility and efficiency for the entire system. The carrier gas scrubber removes oxygen and impurities in the air and retains nitrogen as the carrier gas. This design not only optimizes the quality of the sample, but also improves the accuracy of the analysis. The carrier gas is used for detection (pushing the sample to move in the chromatographic column) and temperature control (using a vortex tube to cool the equipment and control the temperature) during the compression process. The present invention uses the sampling hole of the sampling tube to turn to the high-pressure area or the low-pressure area to control the natural gas pressure inside the sampling tube and obtain the power of the compressed carrier gas. This design reduces the equipment's dependence on electricity and extends the battery life. At the same time, the temperature control function of the vortex tube ensures the stability of the sample during the analysis process, which helps to achieve efficient gas analysis. Through intelligent control, the flow of the carrier gas is combined with the sampling process, which improves the overall performance of the system, making the device more widely and efficiently used in natural gas component analysis; 2. The sampling process of the present invention has a double safety protection design, which ensures the safety of the present invention when it is in use or stopped, compared with the traditional mode controlled by a single valve. When the sampling tube turns to the closed end, it cooperates with the first micro pump to achieve double leakage prevention and reduce the risk of gas leakage in the non-working state. In addition, the system can achieve safe isolation during the sampling and analysis process to prevent cross-contamination of samples and interference with the samples by the external environment. This multiple safety mechanism not only protects the safety of equipment and operators, but also provides a guarantee for the accuracy of experimental data, making operations in high-pressure environments more stable and reliable; 3. As a closed automated detection system, the present invention not only improves the safety and reliability of the sampling process, but also reduces the need for manual operation and the possibility of human error. By integrating the sampling and analysis processes in a closed environment, the system can effectively prevent the influence of external pollution on the samples and ensure the accuracy and representativeness of the collected natural gas samples. In addition, the automated control system can monitor and adjust the pressure and temperature of the samples in real time, thereby optimizing the sampling process. This closed working environment can also prevent sample leakage, further enhancing the stability and safety of the system in long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings: Figure 1 It is a structural schematic diagram of this embodiment; Figure 2 For this embodiment relative to Figure 1 Another perspective structural diagram; Figure 3 This is a schematic diagram of the upper position cutting of this embodiment; Figure 4This is a schematic diagram of the cutting at the middle position of this embodiment; Figure 5 This is a schematic diagram of the cutting position of the chromatographic chamber of this embodiment; Figure 6 for Figure 5 Detailed diagram at A in the middle; Figure 7 This is a schematic diagram of the sampling unit structure of this embodiment; Figure 8 for Figure 7 A schematic diagram of the structure of the middle sampling unit from another perspective; Fig. 9 for Figure 8 Detailed diagram at B in the middle; Fig.10 for Figure 7 A schematic diagram of the structure of the middle sampling unit from another perspective; Fig.11 for Fig.10 A schematic diagram of the structure of one side of the sampling part of the middle sampling unit; Fig.12 It is a schematic diagram of the first cutting of the sampling unit; Fig.13 for Fig.12 Detailed diagram at C in the middle; Fig.14 for Fig.12 Detailed diagram at D in the middle; Fig.15 for Fig.12 Detailed diagram at E in the middle; Fig.16 Schematic diagram of the second cutting of the sampling unit; Fig.17 Schematic diagram of the structure of the sampling tube, driven gear and piston assembly inside the sampling unit; Fig.18 Schematic diagram of the third cut of the sampling unit.

[0015] The reference numerals represent: 1-controller, 2-chromatographic chamber, 3-sampling strip, 4-connecting thread, 5-vortex tube mounting part, 6-micro pump, 7-carrier gas scrubber, 8-photoion detector, 9-sampling unit, 10-waste gas bottle, 11-carrier gas bottle, 12-vortex tube, 13-chromatographic column, 14-annular cavity, 15-sampling interface, 16-micro sample bottle, 17-first micro valve, 18-micro motor, 19-driving gear, 20-driven gear, 21-connecting chamber shell, 22-second micro valve, 23-third micro valve, 24-micro three-way pipe, 25-sampling hole, 26-guiding hole, 27-arc groove, 28-sampling tube, 29-piston cylinder shell, 30-first piston cavity, 31-second piston cavity, 32-first piston, 33-connecting rod, 34-second piston, 35-closed end, 36-guiding end. DETAILED DESCRIPTION

[0016] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0017] like Figures 1 to 18 As shown, this embodiment relates to a natural gas component analysis sampling device, which is used to be installed on a pipeline, continuously analyze the components of the natural gas in the pipeline, and transmit the results to a terminal (the terminal is usually a computer, etc.), including a control unit, a sampling unit 9, a carrier gas unit, a temperature control unit and a detection unit, wherein the control unit is correspondingly provided with a controller 1, and the controller 1 is used to adjust and control the coordinated work of each of the units; the sampling unit 9 is used to sample natural gas; the carrier gas unit is used to obtain and store nitrogen from the air (the sampled natural gas is driven to move in the detection unit by the carrier gas); the temperature control unit is used to regulate The temperature of each unit of the embodiment (for example, when the carrier gas drives the various components of natural gas to move in the chromatographic column 13, the optimal temperature is between 0 and 80 degrees Celsius. Depending on the specific detection method, the optimal temperature in this embodiment is between 47 and 63 degrees Celsius. When sampling natural gas, the temperature should be kept low or when compressing the carrier gas, the optimal temperature needs to be controlled below 0 degrees Celsius to ensure stability and efficiency); the detection unit is used to detect the specific components of natural gas and generate corresponding electrical signals. The controller 1 transmits the electrical signal results corresponding to each component to the terminal via wireless transmission, and the terminal compares and quantitatively analyzes the composition of the natural gas components by analyzing the electrical signals.

[0018] The core component of this embodiment is the sampling unit 9, which includes a sampling strip 3, a sampling tube 28, a driving device, a piston cylinder shell 29 and a piston assembly therein (the piston assembly includes a first piston 32, a connecting rod 33 and a second piston 34). The sampling tube 28 is arranged in the sampling strip 3 and can be rotated by a driving device (the driving device includes a micro motor 18, a driving gear 19 and a driven gear 20); the sampling strip 3 is connected to the piston cylinder shell 29. The piston cylinder shell 29 is equipped with a sampling interface 15 and a piston assembly, and the natural gas source compresses the gas (nitrogen obtained from the atmosphere by the carrier gas unit) by pushing the piston assembly.

[0019] Specifically, the sampling tube 28 is parallel to the sampling strip 3, and is rotatably arranged in the middle of the sampling strip 3. A connecting cavity shell 21 is fixed at one end of the sampling strip 3. The sampling tube 28 passes through the connecting cavity shell 21 and is rotatably connected to the piston cylinder shell 29 at the other end of the connecting cavity shell 21. In the middle of the connecting cavity shell 21, a driven gear 20 is coaxially fixed to the sampling tube 28. The driven gear 20 is meshed with the driving gear 19. The driving gear 19 is driven by the micro motor 18, so that the micro motor 18 can drive the sampling tube 28 to rotate; the connecting cavity shell 21 and the sampling strip 3 are also provided with a connecting thread 4. The connecting thread 4 is used for the embodiment to be installed on the high-pressure natural gas pipeline. The sampling tube 28 is provided with a driven gear 20 at the cavity position in the middle of the connecting cavity shell 21, which is meshed with the driving gear 19 driven by the micro motor 18. The design of this gear system makes the rotation of the sampling tube 28 more precise and can be quickly switched at different angles.

[0020] Furthermore, the sampling strip 3 is provided with two arc grooves 27 extending along its length direction (the strip direction of the sampling strip 3), which are in opposite directions. The two arc grooves 27 are arranged in parallel, and there are multiple flow guide holes 26 of the same size in a linear array along the length direction of the sampling strip 3 in the arc groove 27, and each flow guide hole 26 is perpendicular to and passes through the sampling strip 3. There is also a cylindrical hole in the middle of the sampling strip 3, which is closed away from the side of the connecting cavity shell 21, and the direction of the cylindrical hole is the same as that of the sampling strip 3, and the cylindrical hole is connected to the flow guide hole 26. The sampling tube 28 rotates in the cylindrical hole, and there are multiple sampling holes 25 on one side of its circumference, and the sampling holes 25 correspond to the flow guide holes 26 one by one. The rotating sampling tube 28 can connect or isolate the sampling holes 25 and the flow guide holes 26. The sampling tube 28 is arranged in the middle of the sampling strip 3 and can be rotated by the driving device, so as to realize flexible selection of different sampling positions (selecting to be connected with or isolated from the flow guide hole 26, connecting to turn the sampling hole 25 to the flow guide end 36, and isolating to turn the sampling hole 25 to the closed end 35, so that the sampling hole 25 can be connected with the flow guide hole 26 before collecting the sample in the present embodiment, so that the sample is collected in the collection tube, and then the sampling tube 28 is rotated to the closed end 35, so that the first isolation of the pipeline natural gas is completed in advance during the sample collection process of the present embodiment, and the first micro valve 17 can complete the second safety isolation to prevent leakage. In addition, when the present embodiment stops working, by turning the sampling tube 28 to the closed end 35, the present embodiment has a double anti-leakage capability in the state of long-term stop working, ensuring that it maintains a high safety factor).

[0021] The design of sleeved sampling tube 28 in cylindrical hole enables sampling tube 28 to rotate freely therein, and the sampling holes 25 on one side of the circumference of sampling tube 28 can correspond to flow guide holes 26 one by one. When sampling tube 28 rotates, the corresponding sampling holes 25 can be accurately connected or isolated with flow guide holes 26. This design not only improves the flexibility of sampling, but also reduces the risk of cross-contamination of samples and reduces the risk of leakage. In addition, the two arc-shaped grooves 27 and the corresponding multiple flow guide holes 26 provided on sampling strip 3 greatly enhance the fluidity of gas. The design of flow guide holes 26 ensures that the gas can be quickly and evenly distributed during the sampling process, thereby improving the representativeness of sampling. The size of each flow guide hole 26 is consistent, ensuring the stability and repeatability of fluid flow.

[0022] More specifically, one end of the sampling tube 28 connected to the piston cylinder shell 29 is open and connected to the first piston chamber 30 of the piston cylinder shell 29. The piston cylinder shell 29 is provided with a sampling interface 15, the output end of which is connected to the micro-sample bottle 16, and is connected to the input end through the first micro valve 17. There is a first piston 32 in the first piston chamber 30, and there is also a second piston chamber 31 in the piston cylinder shell 29, and there is a second piston 34 in the second piston chamber 31. The first piston 32 pushes the second piston 34 to move back and forth in its chamber through the connecting rod 33. The diameter of the second piston chamber 31 is smaller than the first piston chamber 30 (for expanding the pressure multiple and improving the compression ratio of the first piston chamber 30), and is connected to the micro three-way pipe 24 on the side away from the first piston 32, and the latter's two pipes are respectively connected to the second micro valve 22 and the third micro valve 23.

[0023] The installation arrangement of this embodiment requires that the axis of the cylindrical hole be arranged perpendicular to the pipeline, and the sampling strip 3 be installed in the pipeline. In addition, each guide hole 26 is arranged parallel to the pipeline, wherein the arc-shaped groove 27 facing the upstream pipeline of the high-pressure natural gas forms a natural gas high-pressure area under the convergence and extrusion of the high-pressure natural gas fluid, and the arc-shaped groove 27 facing the downstream of the high-pressure natural gas fluid forms a natural gas low-pressure area under the action of the fluid. During the rotation of the sampling tube 28, the sampling hole 25 switches back and forth between the high-pressure area and the low-pressure area, thereby driving the first piston 32 to reciprocate, utilizing the internal pressure of the high-pressure pipeline to work, and collecting the compressed carrier gas not only for detection purposes, but also for controlling the temperature through the vortex tube 12, which greatly saves the power of the battery of this embodiment and improves its working endurance.

[0024] In addition, the design of the piston cylinder shell 29 provides a closed and controllable environment for sampling. The setting of the first piston chamber 30 enables the sampling process to be carried out under controllable pressure (the sample can adjust the pressure), which helps to improve the integrity and accuracy of the sample. The design of the sampling interface 15 allows the sampled gas to be smoothly transported to the micro-sample bottle 16, and the first micro-valve 17 connected to the micro-sample bottle 16 can effectively control the outflow of the sample to avoid possible leakage during the sampling and analysis process.

[0025] Furthermore, the carrier gas unit is composed of a carrier gas scrubber 7 and a carrier gas bottle 11. The input end of the carrier gas scrubber 7 is connected to the atmosphere, and is used to remove oxygen and impurities in the air, and retain nitrogen as the carrier gas. The output end of the carrier gas scrubber 7 is connected to the third micro valve 23 through a pipeline, and the carrier gas bottle 11 is connected to the second micro valve 22 through a pipeline. The working process is that the controller 1 controls the sampling hole 25 of the sampling tube 28 to turn to communicate with the guide hole 26 on the side of the low-pressure area, and then controls the carrier gas scrubber 7 to work. The carrier gas generated by the carrier gas scrubber 7 is input into the micro three-way pipe 24 through the third micro valve 23, and the third micro valve 23 is closed. The controller 1 controls the motor to rotate the sampling tube 28, so that the sampling hole 25 of the sampling tube 28 is turned to the high-pressure area, so that the sampling tube 28 is filled with high-pressure natural gas, and then the first piston 32 and the second piston 34 are pushed to compress the carrier gas, and then the second micro valve 22 is opened to fill the carrier gas into the carrier gas bottle 11, and the control is repeated, and reciprocated.

[0026] Furthermore, the temperature control unit includes a vortex tube 12 and a flow control valve (the vortex tube 12 is arranged in the vortex tube installation portion 5), the flow control valve is connected to the air inlet of the carrier gas bottle 11 and the vortex tube 12 through pipelines, and the cold air port and the hot air port of the vortex tube 12 are respectively led to the sampling unit 9 and the chromatographic chamber 2 of the detection unit (the chromatographic chamber 2 is provided with a closed annular cavity 14, and the chromatographic column 13 is arranged in the annular cavity 14). When the detection unit is working, the controller 1 controls the flow control valve to fill the carrier gas in the carrier gas bottle 11 into the vortex tube 12. , so that the hot air of the vortex tube 12 enters the chromatographic chamber 2, and the chromatographic chamber 2 is correspondingly provided with a temperature sensor. When the temperature is lower than the expected value, the valve opening of the flow control valve is increased to allow more carrier gas to enter the vortex tube 12, so that the vortex tube 12 generates more hot air to enter the chromatographic chamber 2. On the contrary, the carrier gas flow entering the vortex tube 12 is reduced, and the cold air is introduced into the shell on one side of the sampling unit 9, so that the cold air absorbs a large amount of heat generated by the sampling unit 9 during operation, such as the heat generated by the micro motor 18 and the compression process, to ensure the normal operation.

[0027] Furthermore, the detection unit is composed of a mixing chamber, a chromatographic column 13, a photoionization detector 8, a micro pump 6 and a waste gas bottle 10. The carrier gas in the carrier gas bottle 11 can be mixed with the sample through the mixing chamber, and the sample is pushed into the chromatographic column 13, and then enters the photoionization detector 8 for component detection; the micro pump 6 is responsible for pumping the detected waste gas into the waste gas bottle 10. This technology eliminates the shortcomings of the prior art that waste gas is usually burned and discharged directly into the atmosphere to pollute the air, while ensuring the safety of online monitoring. The operator only needs to replace the waste gas bottle 10 regularly. The specific implementation methods described above further explain the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not used to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A natural gas component analysis sampling device, comprising a control unit, a sampling unit (9), a carrier gas unit, a temperature control unit and a detection unit, characterized in that: The control unit is used to control the sampling unit (9) to obtain a sample, and to control the carrier gas unit to provide a carrier gas, and can also control the carrier gas to drive the sample to move in the detection unit and perform detection; The sampling unit (9) comprises a sampling strip (3), a sampling tube (28), a driving device and a piston cylinder shell (29). The sampling tube (28) is rotatably arranged in the sampling strip (3) and is rotated by the driving device. The sampling tube (28) is connected to the piston cylinder shell (29). The piston cylinder shell (29) is provided with a sampling interface (15) and a piston assembly. The natural gas source achieves gas compression by pushing the piston assembly.

2. A natural gas component analysis sampling device as claimed in claim 1, characterized in that: The sampling tube (28) and the sampling strip (3) are oriented in the same direction and are rotatably arranged in the middle of the sampling strip (3); a connecting cavity shell (21) is fixed at one end of the sampling strip (3); the sampling tube (28) passes through the connecting cavity shell (21) and is rotatably connected to a piston cylinder shell (29) arranged at the other end of the connecting cavity shell (21); a driven gear (20) is coaxially fixed to the sampling tube (28) at a hollow position in the middle of the connecting cavity shell (21); the driven gear (20) is meshed with a driving gear (19), and the driving gear (19) is driven by a correspondingly arranged micro motor (18).

3. A natural gas component analysis sampling device as claimed in claim 2, characterized in that: The sampling strip (3) is provided with two arc-shaped grooves (27) along its direction, and the two grooves are in opposite directions; a plurality of flow guide holes (26) are provided in a linear array in the grooves along the direction of the sampling strip (3), and the flow guide holes (26) are of the same size and penetrate the sampling strip (3); a cylindrical hole is also provided in the middle of the sampling strip (3) along its direction, and the cylindrical hole is connected to the flow guide holes (26), and the cylindrical hole is closed on the side away from the connecting cavity shell (21); the sampling tube (28) is rotatably arranged in the cylindrical hole, and a plurality of sampling holes (25) are provided on one side of the circumference thereof corresponding to the flow guide holes (26), and the sampling holes (25) are of the same size as the flow guide holes (26); when the sampling tube (28) rotates, the sampling holes (25) can be connected to or isolated from the corresponding flow guide holes (26).

4. A natural gas component analysis sampling device as claimed in claim 3, characterized in that: One end of the sampling tube (28) rotatably connected to the piston cylinder shell (29) is open and communicates with the first piston chamber (30) of the piston cylinder shell (29); the piston cylinder shell (29) is provided with a sampling interface (15); the output end of the sampling interface (15) is connected to a micro-sample bottle (16); the micro-sample bottle (16) is connected to a first micro-valve (17); the input end of the sampling interface (15) is communicated with the first piston chamber (30); the first piston chamber (30) is provided with a first piston (32); the piston cylinder shell (29) is also provided with a second piston chamber (31) The second piston chamber (31) is provided with a second piston (34); the first piston (32) and the second piston (34) are connected via a connecting rod (33); the first piston (32) pushes the second piston (34) to reciprocate in the second piston chamber (31); the diameter of the second piston chamber (31) is smaller than that of the first piston chamber (30), and the side of the second piston chamber (31) away from the first piston (32) is connected to a micro three-way pipe (24); the other two pipes of the micro three-way pipe (24) are respectively connected to a second micro valve (22) and a third micro valve (23).

5. A natural gas component analysis sampling device as claimed in claim 1, characterized in that: The carrier gas unit comprises a carrier gas scrubber (7) and a carrier gas bottle (11); the input end of the carrier gas scrubber (7) is connected to the atmosphere and is used to remove oxygen and impurities in the air, and the output end of the carrier gas scrubber is connected to a third micro valve (23) through a pipeline; the carrier gas bottle (11) is connected to a second micro valve (22) through a pipeline.

6. A natural gas component analysis sampling device as claimed in claim 1, characterized in that: The temperature control unit comprises a vortex tube (12) and a flow control valve; the flow control valve is connected to the carrier gas bottle (11) and the air inlet of the vortex tube (12) through pipelines, respectively; the cold air outlet and the hot air outlet of the vortex tube (12) are respectively directed to the chromatographic chamber (2) corresponding to the sampling unit (9) and the detection unit.

7. A natural gas component analysis sampling device as claimed in claim 1, characterized in that: The detection unit comprises a mixing chamber, a chromatographic column (13), a photoionization detector (8), a micro pump (6) and a waste gas bottle (10); the carrier gas in the carrier gas bottle (11) is mixed with the sample through the mixing chamber, driving the sample to move in the chromatographic column (13) and enter the photoionization detector (8) for component detection; the micro pump (6) is connected to the photoionization detector (8) and is used to pump the waste gas after detection into the waste gas bottle (10).

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