Natural gas pipeline sampling device

Abstract

The utility model discloses a natural gas pipeline sampling device which comprises a pipeline and a sampling device body, a groove is formed in the upper surface of the pipeline, and the sampling device body is installed in the groove. A cavity is formed in the sampling device, a sampling pipe is vertically arranged in the sampling device, the sampling pipe penetrates through the sampling device and is fixedly installed in the pipeline, a bottom pipe opening of the sampling pipe is formed in the pipeline, and an upper end pipe opening of the sampling pipe is formed in the sampling device; a sliding block is elastically installed at the bottom end in the sampling device, the sliding block and the inner wall of the sampling device slide in a limiting mode, and a sealing cover plate matched with an upper end pipe opening of the sampling pipe is fixedly arranged at the position, corresponding to the upper end pipe opening of the sampling pipe, of the sliding block; a piston is mounted in the sampling device in a sliding manner and is arranged above the sliding block; the sampling device is provided with a gas collecting pipe corresponding to an area between the sliding block and the piston, and the gas collecting pipe penetrates into an inner cavity of the sampling device and does not interfere with the piston. The sliding block and the sealing cover plate are arranged, so that the problem of air leakage caused by the fact that the device is not used for a long time is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas development, storage and transportation, and specifically relates to a natural gas pipeline sampling device. Background Technique

[0002] During the process of natural gas transportation, it is necessary to sample and analyze the extracted natural gas samples. Generally, natural gas sampling is carried out by opening the pipeline, then connecting the sampling device to the opening of the pipeline, and then transporting the sampled gas collected by the sampling device to the sampled gas analysis device for analysis of the sampled gas. Some sampling devices first temporarily store the sampled gas in a container and then analyze the sampled gas in the container.

[0003] For example, the invention application patent with the patent number CN202311536773.7 discloses a sampling device for a natural gas pipeline, belonging to the technical field of natural gas detection and sampling. It includes a connection component, an inner spring column component, an outer rotating sleeve component, an elastic connection component and a limit sampling component. It is connected to the main natural gas pipeline through a flange base. In the non-sampling state, under the action of the inner top spring force, the inner limit ring is in a position where it squeezes and seals the top sealing ring; during sampling, as the sampling connection pipe is inserted into the inner hole of the connection plug column in place, the buckle at the bottom end of the clamping arm forms a safe clamping connection with the clamping groove on the outer side of the outer conversion seat, and pushes the connection plug column downward in place, and the opening and closing rack opens the valve core through cooperation with the opening and closing gear; thereafter, as the outer rotating sleeve rotates in place, the positioning elastic piece is elastically clamped in the positioning clamping groove, the bottom end of the connection plug column pushes the two-way cutting seat downward in place, and the natural gas in the flange base will enter the sampling bottle through the sampling connection pipe. And as the sampling bottle is detached, after the opening and closing rack rebounds, the valve core can be automatically closed.

[0004] Although this sampling device for a natural gas pipeline only needs to rotate the outer rotating sleeve after the limit sampling component is inserted in place, so that the bottom end of the connection plug column forms a downward elastic cutting force on the two-way cutting seat, the inner limit ring can be opened, and the natural gas in the main cavity of the connection component body can enter the sampling connection pipe, and the sampling work can be conveniently completed; however, during the whole process of collecting natural gas by the sampling device, the air pressure in the pipeline always acts on the sampling device. When the sampling bottle is removed after sampling, gas leakage may occur, and there will be residual gas in the sampling device, posing a safety hazard; it needs to be further improved. Content of the Utility Model

[0005] The purpose of the utility model is to provide a natural gas pipeline sampling device, aiming to improve the problems that the sampling device may cause gas leakage, and at the same time, there will be residual gas in the sampling device, posing a safety hazard.

[0006] The present utility model is realized as follows: A natural gas pipeline sampling device includes a pipeline and a sampling device. A groove is formed on the upper surface of the pipeline, and the sampling device is installed in the groove. The interior of the sampling device is a cavity, and a sampling pipe is vertically arranged inside. The sampling pipe passes through the sampling device and is fixedly installed in the pipeline. The bottom pipe orifice of the sampling pipe is arranged inside the pipeline, and the upper pipe orifice is arranged inside the sampling device. An elastic slider is installed at the bottom end inside the sampling device, and the slider is limited and slidable on the inner wall of the sampling device. A sealing cover plate adapted to the upper pipe orifice of the sampling pipe is fixedly arranged at the position of the slider corresponding to the upper pipe orifice of the sampling pipe. A piston is slidably installed inside the sampling device, and the piston is arranged above the slider. A gas collecting pipe is arranged in the sampling device corresponding to the area between the slider and the piston. The gas collecting pipe penetrates through to the inner cavity of the sampling device and does not interfere with the piston.

[0007] Preferably, a through hole is arranged at the bottom of the sampling device, and the sampling pipe passes through the through hole and is fixedly installed in the pipeline.

[0008] Preferably, a spring is arranged at the bottom end inside the sampling device, and the spring is connected to the bottom end of the slider.

[0009] Preferably, the slider includes a groove, a mounting hole, and a positioning block. A groove with an unpenetrated bottom is arranged at the position of the slider corresponding to the sampling pipe. A through mounting hole is arranged at the bottom of the groove. The upper pipe orifice of the sampling pipe is slidably arranged in the groove through the mounting hole. A sealing cover plate is fixedly arranged in the groove. The sealing cover plate is arranged above the sampling pipe and is adapted to the upper pipe orifice of the sampling pipe. The positioning block is arranged on the side surface of the slider, and a matching L-shaped sliding groove is arranged on the inner wall of the sampling device corresponding to the positioning block. The positioning block is slidably installed in the L-shaped sliding groove.

[0010] Preferably, the sealing cover plate includes a rubber sealing gasket, a sealing plate, and a plurality of support rods. Support rods are fixedly installed around the sealing plate. One end of the support rod far from the sealing plate is fixedly installed on the inner wall of the groove. The sealing plate is arranged above the sampling pipe, and a rubber sealing gasket is arranged on the surface corresponding to the sampling pipe. The surface of the sealing plate far from the sampling pipe is lower than the upper end of the slider.

[0011] Preferably, the piston includes a rubber sealing ring, a mounting strip, a limiting block, a piston rod, and a handle. A piston rod is installed on the upper end surface of the piston. A handle is installed at the upper end of the piston rod, and the handle is arranged outside the sampling device. A mounting strip is arranged on the side circumferential surface of the piston. The rubber sealing ring is detachably installed on the piston through the mounting strip. The rubber sealing ring is slidably matched with the inner wall of the sampling device. A limiting block is arranged on the lower end surface of the piston. A limiting hole is arranged on the upper surface of the slider corresponding to the limiting block. The limiting block is adapted to the limiting hole.

[0012] Preferably, a solenoid valve is provided at the gas outlet port of the gas collecting pipe, and a sealing port is provided in the middle of the gas collecting pipe; a solenoid valve is provided at the upper port position of the sampling pipe, and the solenoid valve on the sampling pipe is electrically connected to the solenoid valve on the gas collecting pipe.

[0013] Preferably, a cover plate is detachably installed at the upper end of the sampling device, the piston rod passes through the cover plate, a sealing gasket is provided at the connection between the piston rod and the cover plate, a sealing gasket is provided at the installation position of the sampling device and the pipeline, and a sealing ring is embedded inside the pipeline at the position where the sampling pipe is installed.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] 1. By setting the slider, piston and sealing cover plate, the present utility model solves the problem of air leakage caused by long-term non-use of this device. At the same time, the gas in the sampling device is discharged through the piston, avoiding the existence of residual gas in the sampling device.

[0016] 2. By setting the sealing cover plate, the piston can be easily removed, facilitating the replacement of accessories. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic cross-sectional structure diagram of the present utility model;

[0018] Figure 2 is a schematic structure diagram of the sampling device of the present utility model;

[0019] Figure 3 is the present utility model Figure 1 schematic structure diagram at A in;

[0020] Figure 4 is a schematic cross-sectional structure diagram of the slider of the present utility model;

[0021] Figure 5 is a schematic structure diagram of the sealing cover plate of the present utility model;

[0022] Figure 6 is a schematic cross-sectional structure diagram of the piston of the present utility model.

[0023] In the figure: 1. Pipeline; 2. Sampling device; 201. Through hole; 202. L-shaped chute; 3. Gas collecting pipe; 301. Sealing port; 4. Sampling pipe; 5. Spring; 6. Slider; 601. Limiting hole; 602. Groove; 603. Installation hole; 604. Positioning block; 7. Piston; 701. Rubber sealing ring; 702. Installation strip; 703. Limiting block; 704. Piston rod; 705. Handle; 8. Cover plate; 9. Sealing cover plate; 901. Rubber sealing gasket; 902. Sealing plate; 903. Support rod; 10. Sealing ring; 11. Sealing gasket; 12. Solenoid valve. Detailed implementation mode

[0024] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] The following is a further description in conjunction with the accompanying drawings and specific embodiments:

[0026] Embodiment 1

[0027] As Figure 1 and Figure 2 shown, a natural gas pipeline sampling device includes a pipeline 1 and a sampling device 2. A groove is provided on the upper surface of the pipeline 1, and the sampling device 2 is installed in the groove; the inside of the sampling device 2 is a cavity, and a sampling pipe 4 is vertically arranged inside. A through hole 201 is provided at the bottom of the sampling device 2, and the sampling pipe 4 passes through the through hole 201 and is fixedly installed in the pipeline 1. The sampling pipe 4 passes through the sampling device 2 and is fixedly installed in the pipeline 1. The bottom pipe orifice of the sampling pipe 4 is arranged inside the pipeline 1, and the upper pipe orifice is arranged inside the sampling device 2.

[0028] As Figure 1 and Figure 4 shown, a spring 5 is provided at the bottom end inside the sampling device 2. The spring 5 is connected to the bottom end of the slider 6. The slider 6 is elastically installed at the bottom end inside the sampling device 2, and the slider 6 is limited and slides with the inner wall of the sampling device 2. A sealing cover plate 9 adapted to the upper pipe orifice of the sampling pipe 4 is fixedly arranged at the position of the slider 6 corresponding to the upper pipe orifice of the sampling pipe 4; the slider 6 includes a groove 602, a mounting hole 603, and a positioning block 604. A groove 602 with an unpenetrated bottom is provided at the position of the slider 6 corresponding to the sampling pipe 4. A through mounting hole 603 is provided at the bottom of the groove 602, and the mounting hole 603 is in sliding abutment with the sampling pipe 4.

[0029] As Figure 1 、 Figure 4 and Figure 5As shown, the upper end opening of the sampling tube 4 is slidably arranged in the groove 602 through the mounting hole 603. A sealing cover plate 9 is fixedly arranged in the groove. The sealing cover plate 9 is arranged at the upper end of the sampling tube 4 and is adapted to the upper end opening of the sampling tube 4, and can seal the upper port of the sampling tube 4. The positioning block 604 is arranged on the side surface of the slider 6. An L-shaped sliding groove 202 adapted to the positioning block 604 is arranged on the inner wall of the sampling device 2. The positioning block 604 is slidably installed in the L-shaped sliding groove 202. The sealing cover plate 9 includes a rubber sealing gasket 901, a sealing plate 902 and a plurality of support rods 903. Support rods 903 are fixedly installed around the sealing plate 902. The end of the support rod 903 away from the sealing plate 902 is fixedly installed on the inner wall of the groove 602. The sealing plate 902 is arranged above the sampling tube 4, and a rubber sealing gasket 901 is arranged on the surface corresponding to the sampling tube 4. The surface of the sealing plate 902 away from the sampling tube 4 is lower than the upper end of the slider 6.

[0030] As Figure 1 , Figure 4 and Figure 6 shown, a piston 7 is slidably installed inside the sampling device 2. The piston 7 is arranged above the slider 6. The piston 7 includes a rubber sealing ring 701, a mounting strip 702, a limiting block 703, a piston rod 704 and a handle 705. The piston rod 704 is installed on the upper end surface of the piston. The handle 705 is installed at the upper end of the piston rod 704. The handle 705 is arranged outside the sampling device 2. The side ring surface of the piston 7 is provided with a mounting strip 702. The rubber sealing ring 701 is detachably installed on the piston 7 through the mounting strip 702. The rubber sealing ring 701 is in sliding fit with the inner wall of the sampling device 2. The lower end surface of the piston 7 is provided with a limiting block 703. A limiting hole 601 corresponding to the position of the limiting block 703 is arranged on the upper surface of the slider 6. The limiting block 703 is adapted to the limiting hole 601.

[0031] As Figure 1 and Figure 6 shown, a gas collecting pipe 3 is arranged in the sampling device 2 corresponding to the area between the slider 6 and the piston 7. The gas collecting pipe 3 penetrates through the inner cavity of the sampling device 2 and does not interfere with the piston 7. An electromagnetic valve 12 is arranged at the air outlet port of the gas collecting pipe 3. A sealing port 301 is opened in the middle of the gas collecting pipe 3. An electromagnetic valve 12 is arranged at the upper port position of the sampling tube 4. The electromagnetic valve 12 on the sampling tube 4 is electrically connected to the electromagnetic valve 12 on the gas collecting pipe 3. A cover plate 8 is also detachably installed at the upper end of the sampling device 2. The piston rod 704 penetrates through the cover plate 8. A sealing gasket 11 is arranged at the connection between the piston rod 704 and the cover plate 8. A sealing gasket 11 is arranged at the installation position of the sampling device 2 and the pipe 1. A sealing ring 10 is embedded inside the pipe 1 at the position where the sampling tube 4 is installed. The electromagnetic valve 12 on the sampling tube 4 and the electromagnetic valve 12 on the gas collecting pipe 3 are controlled by an electrical link to synchronously open and close one of the two electromagnetic valves 12.

[0032] Embodiment 2

[0033] As Figure 1 and Figure 2 shown, a natural gas pipeline sampling device includes a pipeline 1 and a sampling device 2. A groove is provided on the upper surface of the pipeline 1, and the sampling device 2 is installed in the groove. The inside of the sampling device 2 is a cavity, and a sampling pipe 4 is vertically arranged inside. A through hole 201 is provided at the bottom of the sampling device 2. The sampling pipe 4 passes through the through hole 201 and is fixedly installed in the pipeline 1. The sampling pipe 4 passes through the sampling device 2 and is fixedly installed in the pipeline 1. The bottom pipe orifice of the sampling pipe 4 is arranged inside the pipeline 1, and the upper pipe orifice is arranged inside the sampling device 2.

[0034] As Figure 1 and Figure 4 shown, a spring 5 is provided at the bottom end inside the sampling device 2. The spring 5 is connected to the bottom end of a slider 6. The slider 6 is elastically installed at the bottom end inside the sampling device 2, and the slider 6 and the inner wall of the sampling device 2 are limited to slide. A sealing cover plate 9 adapted to the upper pipe orifice of the sampling pipe 4 is fixedly provided at the position of the slider 6 corresponding to the upper pipe orifice of the sampling pipe 4. The slider 6 includes a groove 602, a mounting hole 603 and a positioning block 604. A groove 602 with an unperforated bottom is provided at the position of the slider 6 corresponding to the sampling pipe 4, and a through mounting hole 603 is provided at the bottom of the groove 602.

[0035] As Figure 1 , Figure 4 and Figure 5 shown, the upper pipe orifice of the sampling pipe 4 is slidably arranged in the groove 602 through the mounting hole 603. A sealing cover plate 9 is fixedly provided in the groove. The sealing cover plate 9 is arranged above the sampling pipe 4 and is adapted to the upper pipe orifice of the sampling pipe 4. The positioning block 604 is arranged on the side of the slider 6, and a matching L-shaped sliding groove 202 is provided at the position of the inner wall of the sampling device 2 corresponding to the positioning block 604. The positioning block 604 is slidably installed in the L-shaped sliding groove 202. The sealing cover plate 9 includes a rubber sealing gasket 901, a sealing plate 902 and a plurality of support rods 903. Support rods 903 are fixedly installed around the sealing plate 902. The end of the support rod 903 away from the sealing plate 902 is fixedly installed on the inner wall of the groove 602. The sealing plate 902 is arranged above the sampling pipe 4, and a rubber sealing gasket 901 is provided on the surface corresponding to the sampling pipe 4. The surface of the sealing plate 902 away from the sampling pipe 4 is lower than the upper end of the slider 6.

[0036] As Figure 1 , Figure 4 and Figure 6As shown in the figure, a piston 7 is slidably installed inside the sampling device 2, and the piston 7 is arranged above the slider 6; the piston 7 includes a rubber sealing ring 701, a mounting strip 702, a limiting block 703, a piston rod 704 and a handle 705. The piston rod 704 is installed on the upper end surface of the piston, and the handle 705 is installed on the upper end of the piston rod 704. The handle 705 is arranged outside the sampling device 2; a mounting strip 702 is arranged on the side annular surface of the piston 7, and the rubber sealing ring 701 is detachably installed on the piston 7 through the mounting strip 702. The rubber sealing ring 701 is in sliding fit with the inner wall of the sampling device 2; a limiting block 703 is arranged on the lower end surface of the piston 7, and a limiting hole 601 is arranged on the upper surface of the slider 6 corresponding to the position of the limiting block 703. The limiting block 703 and the limiting hole 601 are adapted to each other.

[0037] As Figure 1 and Figure 6 shown in the figure, a gas collecting pipe 3 is arranged in the sampling device 2 corresponding to the area between the slider 6 and the piston 7. The gas collecting pipe 3 penetrates into the inner cavity of the sampling device 2 and does not interfere with the piston 7; an electromagnetic valve 12 is arranged at the air outlet port of the gas collecting pipe 3, and a sealing port 301 is arranged in the middle of the gas collecting pipe 3; an electromagnetic valve 12 is arranged at the upper port position of the sampling pipe 4, and the electromagnetic valve 12 on the sampling pipe 4 is electrically connected to the electromagnetic valve 12 on the gas collecting pipe 3; a cover plate 8 is detachably installed at the upper end of the sampling device 2. The piston rod 704 penetrates through the cover plate 8, and a sealing gasket 11 is arranged at the connection between the piston rod 704 and the cover plate 8. A sealing gasket 11 is arranged at the installation position of the sampling device 2 and the pipeline 1, and a sealing ring 10 is embedded inside the pipeline 1 at the position where the sampling pipe 4 is installed.

[0038] The working principle of the present utility model: When in use, move the handle 705, move the piston 7 to the upper surface of the slider 6 through the piston rod 704, snap the limiting block 703 into the limiting hole 601, rotate the handle 705, drive the slider 6 to rotate through the piston 7, rotate the positioning block 604 in the slider 6 to the side of the L-shaped chute, move the slider 6 upward, so that the sealing cover plate 9 is separated from the upper end pipe orifice of the sampling pipe 4, and then clamp the sampling bag at the gas collecting port. Move the piston 7 up and down. When the piston 7 moves upward, gas enters the inside of the sampling device 2 from the sampling pipe 4. At the same time, close the electromagnetic valve of the sampling pipe 4 and open the electromagnetic valve of the gas collecting pipe 3. When the piston 7 moves downward, the gas is discharged from the gas collecting pipe 3 into the gas collecting bag to complete the sampling. When the sampling is completed, the piston 7 returns to the initial position and contacts the upper side surface of the slider 6 to discharge the natural gas in the sampling device 2. When the device does not continue to sample, continue to press down the piston 7, and the piston 7 drives the slider 6 to move down to the bottom of the L-shaped chute, and then rotate the slider 6 to rotate the positioning block 604 to the bottom of the L-shaped chute to limit the up and down sliding of the slider 6.

[0039] In summary, the utility model solves the problem of air leakage caused by the long-term non-use of this device by setting the slider 6, the piston 7 and the sealing cover plate 9. At the same time, the gas in the sampling device is discharged through the piston 7 to avoid residual gas in the sampling device. By setting the sealing cover plate 9, the piston 7 can be easily removed, facilitating the replacement of accessories.

[0040] The above is only the preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, various changes and modifications can be made to the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included within the protection scope of the utility model.

Claims

1. A natural gas pipeline sampling device, comprising a pipeline (1) and a sampling device (2), characterized in that: The upper surface of the pipeline (1) is provided with a groove, and the sampling device (2) is installed in the groove; the interior of the sampling device (2) is a cavity, and a sampling tube (4) is vertically arranged inside the cavity; the sampling tube (4) passes through the sampling device (2) and is fixedly installed in the pipeline (1); the bottom pipe opening of the sampling tube (4) is arranged inside the pipeline (1), and the upper pipe opening is arranged inside the sampling device (2); a slider (6) is elastically installed at the bottom end of the interior of the sampling device (2), and the slider (6) and the sampling device The inner wall of the sampling tube (2) is limited and slides, and the position of the slider (6) corresponding to the upper end of the sampling tube (4) is fixedly provided with a sealing cover plate (9) adapted to the upper end of the sampling tube (4); a piston (7) is slidably installed inside the sampling device (2), and the piston (7) is arranged above the slider (6); the sampling device (2) is provided with an air collecting pipe (3) corresponding to the area between the slider (6) and the piston (7), and the air collecting pipe (3) passes through the inner cavity of the sampling device (2) and does not interfere with the piston (7).

2. A natural gas pipeline sampling device according to claim 1, characterized in that: The bottom of the sampling device (2) is provided with a through hole (201), and the sampling tube (4) passes through the through hole (201) and is fixedly installed in the pipeline (1).

3. A natural gas pipeline sampling device according to claim 1, characterized in that: A spring (5) is provided at the bottom end of the sampling device (2), and the spring (5) is connected to the bottom end of the sliding block (6).

4. A natural gas pipeline sampling device according to claim 1, characterized in that: The slider (6) comprises a groove (602), a mounting hole (603) and a positioning block (604); the slider (6) is provided with a groove (602) whose bottom is not penetrated at the position corresponding to the sampling tube (4); the bottom of the groove (602) is provided with a penetrating mounting hole (603); the upper end of the sampling tube (4) slides through the mounting hole (603) and is arranged in the groove (602); a sealing cover plate (9) is fixedly arranged in the groove; the sealing cover plate (9) is arranged at the upper end of the sampling tube (4) and is matched with the upper end of the sampling tube (4); the positioning block (604) is arranged on the side of the slider (6); the inner wall of the sampling device (2) is provided with a matching L-shaped sliding groove (202) corresponding to the position of the positioning block (604); the positioning block (604) is slidably installed in the L-shaped sliding groove (202).

5. A natural gas pipeline sampling device according to claim 4, characterized in that: The sealing cover plate (9) comprises a rubber sealing pad (901), a sealing plate (902) and a plurality of support rods (903); the support rods (903) are fixedly mounted around the sealing plate (902); one end of the support rod (903) away from the sealing plate (902) is fixedly mounted on the inner wall of the groove (602); the sealing plate (902) is arranged above the sampling tube (4), and a rubber sealing pad (901) is arranged on one side corresponding to the sampling tube (4); and the side of the sealing plate (902) away from the sampling tube (4) is lower than the upper end of the slider (6).

6. A natural gas pipeline sampling device according to claim 1, characterized in that: The piston (7) comprises a rubber sealing ring (701), a mounting strip (702), a limiting block (703), a piston rod (704) and a handle (705). The piston rod (704) is mounted on the upper end surface of the piston, and the handle (705) is mounted on the upper end of the piston rod (704). The handle (705) is arranged outside the sampling device (2). The side ring surface of the piston (7) is provided with a mounting strip (702). The rubber sealing ring (701) is detachably mounted on the piston (7) through the mounting strip (702). The rubber sealing ring (701) and the inner wall of the sampling device (2) are slidably matched. The lower end surface of the piston (7) is provided with a limiting block (703). The upper surface of the slider (6) is provided with a limiting hole (601) corresponding to the position of the limiting block (703). The limiting block (703) and the limiting hole (601) are matched.

7. A natural gas pipeline sampling device according to claim 1, characterized in that: The gas outlet port of the gas collecting pipe (3) is provided with a solenoid valve (12), and a sealing port (301) is opened in the middle of the gas collecting pipe (3); the upper port of the sampling pipe (4) is provided with a solenoid valve (12), and the solenoid valve (12) on the sampling pipe (4) is electrically connected to the solenoid valve (12) on the gas collecting pipe (3).

8. A natural gas pipeline sampling device according to claim 6, characterized in that: A cover plate (8) is detachably mounted on the upper end of the sampling device (2); the piston rod (704) passes through the cover plate (8); a sealing gasket (11) is provided at the connection between the piston rod (704) and the cover plate (8); a sealing gasket (11) is provided at the installation location of the sampling device (2) and the pipeline (1); and a sealing ring (10) is embedded inside the location of the pipeline (1) where the sampling tube (4) is installed.

Images