Gas sampling device of gas production wellhead

Abstract

The invention discloses a gas sampling device for a gas production wellhead, and relates to the technical field of gas sampling, the gas sampling device comprises a base and a sampling tank, the sampling tank is fixedly mounted at the top of the base, a sampling pump is fixedly mounted on one side of the top of the base, a sampling pipe is fixedly mounted at the input end of the sampling pump, and the bottom of the sampling pipe extends into an oil well; a gas inlet pipe is fixedly mounted at the output end of the sampling pump, a mounting opening is formed in the base, a filter element seat is movably mounted in the mounting opening, gas inlets are formed in eight side walls of the filter element seat, filter elements are movably mounted in the gas inlets, a plurality of gas collection bottles are movably mounted below the base, and a movable plate is movably mounted below the interior of the base; an air injection pipe is embedded in the movable plate and sleeved with a third spring, and a pressure valve is installed in the air injection pipe. According to the device, the filled gas collecting bottle can be automatically replaced, and meanwhile, the effect that the filter element can be automatically replaced after the filter element is used is achieved.

Description

Technical Field

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

[0002] The gas sampling device at the gas wellhead is a key equipment in the natural gas and oil extraction industry. It is used to accurately collect gas samples from the wellhead to ensure that subsequent analysis is accurate.

[0003] After searching for a Chinese patent with announcement number CN212317982U, a safe sampling device for oil and gas production wellheads is disclosed, comprising a placing trolley, a mounting frame is welded on the placing trolley, an oil sampling tank and an oil and gas sampling tank are vertically mounted on the mounting frame, a buffer tank is connected between the oil sampling tank and the oil and gas sampling tank through a gas pipeline, and a pressure reducing layer for multi-layer step-by-step buffering of oil and gas is arranged in the buffer tank. The patent is provided with an oil sampling tank and an oil and gas sampling tank, and the liquid and gas of oil production are sampled separately. The sampled specimen enters the oil sampling tank, and the gas is separated from the oil and liquid and passed into the buffer tank and collected in the oil and gas sampling tank. The buffer tank is provided with a pressure reducing layer for multi-layer step-by-step buffering of oil and gas. The pressure reduction of the pressure reducing layer in the buffer tank makes the pressure of the oil and gas introduced into the oil and gas sampling tank controllably buffered, making sampling safer.

[0004] However, the above invention has the following disadvantages: When oil and gas are sampled, there are some impurities inside, which need to be filtered. Generally, filter elements are used for filtering. After long-term use, the existing equipment needs to remove the sampling equipment to replace or clean the filter element, which is more troublesome. At the same time, the gas collecting bottle for collecting oil and gas also needs to be replaced manually after it is full. The degree of automation is low, which affects the filtration efficiency. Summary of the invention

[0005] The object of the present invention is to provide a gas sampling device for a gas production wellhead to solve the problems raised in the above-mentioned background technology.

[0006] The technical scheme of the present invention is: a gas sampling device for a gas wellhead, comprising a base and a sampling tank, the sampling tank is fixedly installed on the top of the base, a sampling pump is fixedly installed on one side of the top of the base, a sampling tube is fixedly installed on the input end of the sampling pump, the bottom of the sampling tube extends into the oil well, an air inlet pipe is fixedly installed on the output end of the sampling pump, a mounting port is provided on the base, a filter element seat is movably installed inside the mounting port, eight side walls of the filter element seat are provided, a filter element is movably installed inside the air inlet, a plurality of gas collecting bottles are movably installed below the base, a movable plate is movably installed inside the base, an air injection pipe is inlaid on the movable plate, a third spring is sleeved on the air injection pipe, and a pressure valve is installed inside the air injection pipe; A driving motor is fixedly installed on the bottom of the base, a rotating shaft is fixedly installed on the output end of the driving motor, a first gear is fixedly installed on the bottom of the rotating shaft, a mounting seat is movably installed on the base, a plurality of gas collecting bottles are evenly distributed and movably embedded on the mounting seat, a first gear ring is embedded on the mounting seat, the first gear ring is meshed with the first gear for transmission, and a transmission mechanism is arranged between the base and the sampling tank.

[0007] Preferably, the transmission mechanism includes a second gear, a first transmission shaft, a mounting ring, a second gear ring, a second transmission shaft and transmission bevel gears. The second gear is movably mounted on one side of the top of the base, the first transmission shaft is fixedly mounted on the top of the second gear, the mounting ring is fixedly sleeved on the filter element seat, the filter element seat is movably mounted on the inside of the mounting port through the mounting ring, the second gear ring is fixedly sleeved on the outer side wall of the mounting ring, the second transmission shaft is laterally movably mounted on the upper inside of the base, there are three transmission bevel gears, and the three transmission bevel gears are respectively fixedly sleeved on both ends of the second transmission shaft and the top of the first transmission shaft.

[0008] Preferably, the second gear is meshed with the first gear ring for transmission, and the transmission bevel gear on the first transmission shaft and the second gear ring are respectively meshed with the two transmission bevel gears on the second transmission shaft for transmission.

[0009] Preferably, a telescopic tube is fixedly installed on the air inlet pipe, a first spring is installed inside the telescopic tube, the position of the telescopic tube corresponds to the filter element, an air supply pipe is fixedly installed inside the base, one end of the air supply pipe is located inside the filter element seat, a movable tube is movably installed on the air supply pipe, the movable tube corresponds to the position of the filter element, and a second spring is installed inside the air supply pipe.

[0010] Preferably, the telescopic tube and the movable tube are in contact with the side wall of the filter element seat.

[0011] Preferably, a mounting groove is provided at the top of the filter element seat corresponding to the position of the filter element, the mounting groove is communicated with the interior of the air inlet, a filter element shell is movably installed inside the mounting groove, and the filter element is embedded in the filter element shell.

[0012] Preferably, a gas injection sealing mechanism is provided inside the gas collecting bottle, and the gas injection sealing mechanism includes a sealing plate, a mounting rod and a fourth spring. The sealing plate is arranged above the inside of the gas collecting bottle, and the sealing plate seals the bottle mouth of the gas collecting bottle. There are two mounting rods and four springs. The mounting rod is fixedly installed on the top of the sealing plate, and the fourth spring is sleeved on the mounting rod.

[0013] Preferably, the mounting rod passes through the inner and outer side walls of the gas collecting bottle upward, and a plurality of gas injection ports are provided below the side wall of the gas injection pipe.

[0014] Preferably, the gas injection sealing mechanism also includes an exhaust plate, a movable tube and a fifth spring. The exhaust plate is arranged below the sealing plate. There are two vertical rods and five springs. The vertical rods are fixedly installed inside the gas collecting bottle. The vertical rods penetrate the upper and lower walls of the exhaust plate. The fifth spring is sleeved on the vertical rods.

[0015] Preferably, the exhaust plate is a circular plate having the same size as the interior of the gas collecting bottle, and an exhaust port is provided below the side wall of the gas collecting bottle.

[0016] The present invention provides a gas sampling device for a gas wellhead by improvement, which has the following improvements and advantages compared with the prior art: First: In the present invention, when one of the gas collecting bottles is filled, the sampling pump is paused, the movable plate and the gas injection tube are reset, and then the driving motor can be started. The driving motor drives the first gear to rotate through the rotating shaft, and the first gear is meshed with the first gear ring, which in turn drives the mounting base to rotate. The rotation of the mounting base can send away the filled gas collecting bottle, and at the same time send the other unfilled gas collecting bottle to the bottom of the gas injection tube. At this time, the sampling pump can be started again for filling, thereby achieving the effect of automatically replacing the filled gas collecting bottle.

[0017] Secondly, the present invention arranges a transmission mechanism. When the mounting seat rotates to replace the gas collecting bottle, the first gear ring will also drive the second gear to rotate. The second gear will then drive the first transmission shaft to rotate. The first transmission shaft can drive the second transmission shaft to rotate via the transmission bevel gear. The second transmission shaft can drive the mounting ring to rotate via the transmission bevel gear and the second gear ring. The rotation of the mounting ring will drive the filter element seat to rotate. When the filter element seat rotates, the filter element used to filter the gas will also be replaced. The used filter element will be replaced, thereby achieving the effect of automatic replacement of the filter element after use.

[0018] Third: Through the setting of the gas injection sealing mechanism, the present invention allows the gas injection pipe to squeeze the sealing plate when it enters the interior of the gas collecting bottle downward. The sealing plate will move downward after being squeezed, and then the interior of the gas collecting bottle can be injected with gas through the third spring. After the gas injection is completed, the gas injection pipe will reset upward, and the sealing plate will also move upward under the action of the fourth spring, thereby sealing the bottle mouth of the gas collecting bottle again, thereby achieving the effect of automatically sealing the gas collecting bottle to avoid oil and gas leakage.

[0019] Fourthly: In the present invention, when gas is injected into the interior of the gas collecting bottle, the exhaust plate is located below the sealing plate. During gas injection, the exhaust plate will be squeezed and then move downward. The downward movement of the exhaust plate can discharge the air inside the gas collecting bottle through the exhaust port. After the gas injection is completed, the oil and gas will be stored between the sealing plate and the exhaust plate, thereby achieving the effect of automatically exhausting the air during gas injection and improving the purity of the sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a cross-sectional view of the internal structure of the present invention; Figure 3 It is a schematic diagram of the filter element seat structure in the present invention; Figure 4 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 5 It is a schematic diagram of the transmission mechanism structure in the present invention; Figure 6 For the present invention Figure 2 Enlarged view of point B in the middle; Figure 7 It is a cross-sectional view of the internal structure of the gas collecting bottle in the present invention.

[0022] Reference numerals: 1. Base; 2. Sampling tank; 3. Sampling pump; 4. Sampling tube; 5. Air inlet pipe; 6. Mounting port; 7. Filter element seat; 8. Air inlet port; 9. Filter element; 10. Gas collecting bottle; 11. Movable plate; 12. Air injection pipe; 13. Pressure valve; 14. Driving motor; 15. Rotating shaft; 16. First gear; 17. Mounting seat; 18. First gear ring; 19. Second gear; 20. First transmission shaft; 21. Mounting ring; 22. Second gear ring; 23. Second transmission shaft; 24. Transmission bevel gear; 25. Telescopic tube; 26. First spring; 27. Air supply pipe; 28. Movable tube; 29. ​​Second spring; 30. Mounting slot; 31. Filter element shell; 32. Third spring; 33. Air injection port; 34. Sealing plate; 35. Mounting rod; 36. Fourth spring; 37. Exhaust plate; 38. Vertical rod; 39. Fifth spring; 40. Exhaust port. DETAILED DESCRIPTION

[0023] The present invention is described in detail below, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The present invention provides a gas sampling device for a gas wellhead through improvement. The technical solution of the present invention is: like Figures 1 to 7 As shown, an embodiment of the present invention provides a gas sampling device for a gas wellhead, including a base 1 and a sampling tank 2. The base 1 is a rectangular plate. The sampling tank 2 is fixedly installed on the top of the base 1. A sampling pump 3 is fixedly installed on one side of the top of the base 1. A sampling tube 4 is fixedly installed on the input end of the sampling pump 3. The bottom of the sampling tube 4 extends into the oil well. An air inlet pipe 5 is fixedly installed on the output end of the sampling pump 3. The air inlet pipe 5 is an "L"-shaped pipe. The air inlet pipe 5 is used to send the pumped oil and gas into the base 1. An installation port 6 is opened on the base 1. A filter element seat 7 is movably installed inside the installation port 6. The filter element seat 7 is a hollow octagonal structure. The octagon of the filter element seat 7 Each side wall is provided with an air inlet 8, which is a circular structure, and a filter element 9 is movably installed inside the air inlet 8, and the filter element 9 is used to filter the oil and gas entering the base 1. A plurality of gas collecting bottles 10 are movably installed below the base 1, and the gas collecting bottles 10 are used to collect the filtered gas. A movable plate 11 is movably installed below the base 1, and the movable plate 11 is a circular plate with the same size as the inside of the base 1. An air injection pipe 12 is inlaid and installed on the movable plate 11. The air injection pipe 12 is a tubular structure, and the air injection pipe 12 passes through the bottom wall of the base 1. A third spring 32 is sleeved on the air injection pipe 12, and a pressure valve 13 is installed inside the air injection pipe 12; A driving motor 14 is fixedly installed at the bottom of the base 1, and a rotating shaft 15 is fixedly installed on the output end of the driving motor 14. The rotating shaft 15 is a cylindrical structure, and a first gear 16 is fixedly installed at the bottom of the rotating shaft 15. A mounting seat 17 is movably installed on the base 1, and the mounting seat 17 is a circular plate. A plurality of gas collecting bottles 10 are evenly distributed and movably inlaid on the mounting seat 17, and a first gear ring 18 is inlaid on the mounting seat 17. The first gear ring 18 and the first gear 16 are meshed for transmission. A transmission mechanism is arranged between the base 1 and the sampling tank 2. When the gas is filled into the gas collecting bottle 10, the position of the gas collecting bottle 10 corresponds to the position of the gas injection pipe 12. The gas is sent into the interior of the filter element seat 7 through the sampling pump 3. The filter element seat 7 filters the gas through the filter element 9, and the filtered gas enters the interior of the base 1. Since a pressure valve 13 is arranged inside the gas injection pipe 12, as the gas inside the base 1 increases, When the internal pressure of the base 1 is lower than the triggering pressure of the pressure valve 13, the movable plate 11 and the gas injection pipe 12 will be squeezed and moved downward. When the bottom of the gas injection pipe 12 moves to the inside of the gas collecting bottle 10, the pressure valve 13 will be opened. At this time, the gas inside the base 1 can be sent into the inside of the gas collecting bottle 10. When one of the gas collecting bottles 10 is filled, the sampling pump 3 is paused, the movable plate 11 and the gas injection pipe 12 will be reset, and then the driving motor 14 can be started. The driving motor 14 drives the first gear 16 to rotate through the rotating shaft 15, and the first gear 16 is meshed with the first gear ring 18, which will drive the mounting seat 17 to rotate. The rotation of the mounting seat 17 can send away a filled gas collecting bottle 10, and at the same time send the other unfilled gas collecting bottle 10 to the bottom of the gas injection pipe 12. At this time, the sampling pump 3 can be started again for filling, thereby achieving the effect of automatically replacing the filled gas collecting bottle 10. The transmission mechanism includes a second gear 19, a first transmission shaft 20, a mounting ring 21, a second gear ring 22, a second transmission shaft 23 and a transmission bevel gear 24. The second gear 19 is movably mounted on one side of the top of the base 1, and the second gear 19 is meshed with the first gear ring 18 for transmission. The first transmission shaft 20 is a cylindrical structure, and the first transmission shaft 20 is fixedly mounted on the top of the second gear 19. The mounting ring 21 is an annular structure, and the mounting ring 21 is fixedly sleeved on the filter element seat 7. The filter element seat 7 is movably mounted inside the mounting port 6 through the mounting ring 21. The second gear ring 22 is an annular structure, and the second gear ring 22 is fixedly sleeved on the outer side wall of the mounting ring 21. The second transmission shaft 23 is a cylindrical structure, and the second transmission shaft 23 is movably mounted laterally on the upper part of the interior of the base 1. There are three transmission bevel gears 24, and the three transmission bevel gears 24 are fixedly sleeved on the second transmission shaft 23, respectively. The transmission bevel teeth 24 and the second gear ring 22 at both ends of the moving shaft 23 and the top of the first transmission shaft 20, the transmission bevel teeth 24 on the first transmission shaft 20 and the second gear ring 22 are respectively meshed with the two transmission bevel teeth 24 on the second transmission shaft 23 for transmission. Through the setting of the transmission mechanism, when the mounting seat 17 rotates to replace the gas collecting bottle 10, the first gear ring 18 will also drive the second gear 19 to rotate, and the second gear 19 will then drive the first transmission shaft 20 to rotate. The first transmission shaft 20 can drive the second transmission shaft 23 to rotate through the transmission bevel teeth 24. The second transmission shaft 23 can drive the mounting ring 21 to rotate through the transmission bevel teeth 24 and the second gear ring 22. The rotation of the mounting ring 21 will drive the filter element seat 7 to rotate. When the filter element seat 7 rotates, the filter element 9 used to filter the gas will also be replaced, and the used filter element 9 will be replaced, thereby achieving the effect of automatic replacement after the filter element 9 is used.

[0025] A telescopic tube 25 is fixedly installed on the air inlet pipe 5. The telescopic tube 25 is a telescopic structure. A first spring 26 is installed inside the telescopic tube 25. One end of the telescopic tube 25 is in contact with the outer wall of the filter element seat 7. The telescopic tube 25 corresponds to the position of the filter element 9. An air supply pipe 27 is fixedly installed inside the base 1. The air supply pipe 27 is an "L"-shaped tubular structure. One end of the air supply pipe 27 is located inside the filter element seat 7. A movable tube 28 is movably installed on the air supply pipe 27. The movable tube 28 is a tubular structure. The movable tube 28 corresponds to the position of the filter element 9. A second spring 29 is installed inside the air supply pipe 27. The oil and gas pumped up by the sampling pump 3 will pass through The oil and gas are sent into the air inlet 8 through the telescopic tube 25, and then the filter element 9 filters the oil and gas, and then sent into the base 1 through the movable tube 28 and the air supply pipe 27. When the filter element seat 7 stops rotating, the telescopic tube 25 and the movable tube 28 will fit with the side wall of the filter element seat 7 to prevent oil and gas leakage. When the filter element seat 7 rotates, the filter element seat 7 will squeeze the telescopic tube 25 and the movable tube 28. After the filter element seat 7 rotates and the filter element 9 is replaced, the telescopic tube 25 and the movable tube 28 will continue to fit with the side wall of the filter element seat 7 under the action of the first spring 26 and the second spring 29, and then can be sealed again to prevent oil and gas leakage.

[0026] An installation groove 30 is provided at the top of the filter element seat 7 at the position corresponding to the filter element 9. The installation groove 30 is a rectangular structure groove. The installation groove 30 is connected to the interior of the air inlet 8. A filter element shell 31 is movably installed inside the installation groove 30. The filter element 9 is embedded in the filter element shell 31. After the filter element 9 is used, the filter element shell 31 and the filter element 9 can be taken out from the inside of the installation groove 30, and the filter element 9 can be cleaned or replaced, thereby improving the processing efficiency of the filter element 9.

[0027] The gas collecting bottle 10 is provided with a gas injection sealing mechanism inside, and the gas injection sealing mechanism includes a sealing plate 34, a mounting rod 35 and a fourth spring 36. The sealing plate 34 is a circular plate, and the sealing plate 34 is arranged above the inside of the gas collecting bottle 10. The sealing plate 34 seals the bottle mouth of the gas collecting bottle 10. There are two mounting rods 35 and four springs 36. The mounting rod 35 is a cylindrical structure, and the mounting rod 35 is fixedly mounted on the top of the sealing plate 34. The mounting rod 35 penetrates the inner and outer side walls of the gas collecting bottle 10 upwardly, and the fourth spring 36 is sleeved on the mounting rod 35. A plurality of The gas injection port 33 is a circular hole. Through the setting of the gas injection sealing mechanism, when the gas injection pipe 12 enters the interior of the gas collecting bottle 10 downward, the gas injection pipe 12 can squeeze the sealing plate 34. After being squeezed, the sealing plate 34 will move downward. At this time, the interior of the gas collecting bottle 10 can be injected with gas through the third spring 32. When the gas injection is completed, the gas injection pipe 12 is reset upward, and the sealing plate 34 will also move upward under the action of the fourth spring 36, so as to seal the bottle mouth of the gas collecting bottle 10 again, thereby achieving the effect of automatically sealing the gas collecting bottle 10 to avoid oil and gas leakage. The gas injection sealing mechanism also includes an exhaust plate 37, a movable tube 28 and a fifth spring 39. The exhaust plate 37 is a circular plate of the same size as the interior of the gas collecting bottle 10. The exhaust plate 37 is arranged below the sealing plate 34. There are two vertical rods 38 and five springs 39. The vertical rod 38 is a cylindrical rod. The vertical rod 38 is fixedly installed inside the gas collecting bottle 10. The vertical rod 38 runs through the upper and lower walls of the exhaust plate 37. The fifth spring 39 is sleeved on the vertical rod 38. An exhaust port 40 is opened below the side wall of the gas collecting bottle 10. The exhaust port 40 is a circular hole. When the interior of the gas collecting bottle 10 is injected with gas, the exhaust plate 37 is located below the sealing plate 34. During gas injection, the exhaust plate 37 will be squeezed and then move downward. The downward movement of the exhaust plate 37 can discharge the air inside the gas collecting bottle 10 through the exhaust port 40. After the gas injection is completed, the oil and gas will be stored between the sealing plate 34 and the exhaust plate 37, thereby achieving the effect of automatically exhausting air during gas injection, thereby improving the purity of the sampling.

[0028] Specific implementation steps: The gas is sent into the interior of the filter element seat 7 through the sampling pump 3, and the filter element seat 7 filters the gas through the filter element 9. The filtered gas enters the interior of the base 1. Since the pressure valve 13 is arranged inside the gas injection pipe 12, as the gas inside the base 1 increases, when the internal pressure of the base 1 is less than the triggering pressure of the pressure valve 13, the movable plate 11 and the gas injection pipe 12 will be squeezed and moved downward. When the bottom of the gas injection pipe 12 moves to the interior of the gas collecting bottle 10, the pressure valve 13 will be opened. At this time, the gas inside the base 1 can be sent to the interior of the gas collecting bottle 10. When the pressure valve 13 is opened, the gas inside the base 1 can be sent to the interior of the gas collecting bottle 10. After a gas collecting bottle 10 is filled, the sampling pump 3 is paused, the movable plate 11 and the gas injection pipe 12 are reset, and then the driving motor 14 can be started. The driving motor 14 drives the first gear 16 to rotate through the rotating shaft 15, and the first gear 16 is meshed with the first gear ring 18, which in turn drives the mounting seat 17 to rotate. The rotation of the mounting seat 17 can send away a filled gas collecting bottle 10, and at the same time send another unfilled gas collecting bottle 10 to the bottom of the gas injection pipe 12. At this time, the sampling pump 3 can be started again for filling, so as to achieve the effect of automatically replacing the filled gas collecting bottle 10. At the same time, through the setting of the transmission mechanism, when the mounting seat 17 rotates to replace the gas collecting bottle 10, the first gear ring 18 will also drive the second gear 19 to rotate, and the second gear 19 will then drive the first transmission shaft 20 to rotate. The first transmission shaft 20 can drive the second transmission shaft 23 to rotate via the transmission bevel gear 24. The second transmission shaft 23 can drive the mounting ring 21 to rotate via the transmission bevel gear 24 and the second gear ring 22. The rotation of the mounting ring 21 will drive the filter element seat 7 to rotate. When the filter element seat 7 rotates, the filter element 9 used to filter the gas will also be replaced, and the used filter element 9 will be replaced, thereby achieving the effect of automatic replacement after the filter element 9 is used.

[0029] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas sampling device for a gas wellhead, comprising a base (1) and a sampling tank (2), wherein the sampling tank (2) is fixedly mounted on the top of the base (1), and characterized in that: A sampling pump (3) is fixedly mounted on one side of the top of the base (1), a sampling tube (4) is fixedly mounted on the input end of the sampling pump (3), the bottom of the sampling tube (4) extends into the oil well, an air inlet pipe (5) is fixedly mounted on the output end of the sampling pump (3), a mounting port (6) is provided on the base (1), a filter element seat (7) is movably mounted inside the mounting port (6), air inlets (8) are provided on eight side walls of the filter element seat (7), a filter element (9) is movably mounted inside the air inlet (8), a plurality of gas collecting bottles (10) are movably mounted below the base (1), a movable plate (11) is movably mounted inside the base (1), an air injection pipe (12) is inlaid and mounted on the movable plate (11), a third spring (32) is sleeved on the air injection pipe (12), and a pressure valve (13) is mounted inside the air injection pipe (12); A driving motor (14) is fixedly mounted on the bottom of the base (1), a rotating shaft (15) is fixedly mounted on the output end of the driving motor (14), a first gear (16) is fixedly mounted on the bottom of the rotating shaft (15), a mounting seat (17) is movably mounted on the base (1), a plurality of gas collecting bottles (10) are evenly distributed and movably mounted on the mounting seat (17), a first gear ring (18) is mounted on the mounting seat (17), the first gear ring (18) and the first gear (16) are meshed and driven, and a transmission mechanism is provided between the base (1) and the sampling tank (2).

2. A gas sampling device for a gas wellhead according to claim 1, characterized in that: The transmission mechanism comprises a second gear (19), a first transmission shaft (20), a mounting ring (21), a second gear ring (22), a second transmission shaft (23) and transmission bevel gears (24); the second gear (19) is movably mounted on one side of the top of the base (1); the first transmission shaft (20) is fixedly mounted on the top of the second gear (19); the mounting ring (21) is fixedly sleeved on the filter element seat (7); the filter element seat (7) is movably mounted inside the mounting opening (6) through the mounting ring (21); the second gear ring (22) is fixedly sleeved on the outer side wall of the mounting ring (21); the second transmission shaft (23) is movably mounted on the upper part of the inside of the base (1); and there are three transmission bevel gears (24) in total. The three transmission bevel gears (24) are fixedly sleeved on both ends of the second transmission shaft (23) and the top of the first transmission shaft (20), respectively.

3. A gas sampling device for a gas wellhead according to claim 2, characterized in that: The second gear (19) is meshed with the first gear ring (18) for transmission, and the transmission bevel teeth (24) on the first transmission shaft (20) and the second gear ring (22) are respectively meshed with the two transmission bevel teeth (24) on the second transmission shaft (23) for transmission.

4. The gas sampling device for a gas wellhead according to claim 1, characterized in that: A telescopic tube (25) is fixedly mounted on the air inlet pipe (5), a first spring (26) is mounted inside the telescopic tube (25), the telescopic tube (25) corresponds to the position of the filter element (9), an air supply pipe (27) is fixedly mounted inside the base (1), one end of the air supply pipe (27) is located inside the filter element seat (7), a movable tube (28) is movably mounted on the air supply pipe (27), the movable tube (28) corresponds to the position of the filter element (9), and a second spring (29) is mounted inside the air supply pipe (27).

5. The gas sampling device for a gas wellhead according to claim 4, characterized in that: The telescopic tube (25) and the movable tube (28) are in contact with the side wall of the filter element seat (7).

6. The gas sampling device for a gas wellhead according to claim 1, characterized in that: A mounting groove (30) is provided at the top of the filter element seat (7) at a position corresponding to the filter element (9); the mounting groove (30) is communicated with the interior of the air inlet (8); a filter element shell (31) is movably mounted inside the mounting groove (30); and the filter element (9) is mounted in the filter element shell (31).

7. The gas sampling device for a gas wellhead according to claim 1, characterized in that: The gas collecting bottle (10) is provided with a gas injection sealing mechanism inside, and the gas injection sealing mechanism includes a sealing plate (34), a mounting rod (35) and a fourth spring (36). The sealing plate (34) is arranged above the inside of the gas collecting bottle (10), and the sealing plate (34) seals the bottle mouth of the gas collecting bottle (10). There are two mounting rods (35) and four springs (36). The mounting rod (35) is fixedly mounted on the top of the sealing plate (34), and the fourth spring (36) is sleeved on the mounting rod (35).

8. The gas sampling device for a gas wellhead according to claim 7, characterized in that: The mounting rod (35) penetrates upwardly through the inner and outer side walls of the gas collecting bottle (10), and a plurality of gas injection ports (33) are provided below the side wall of the gas injection pipe (12).

9. The gas sampling device for a gas wellhead according to claim 1, characterized in that: The gas injection sealing mechanism also includes an exhaust plate (37), a movable tube (28) and a fifth spring (39). The exhaust plate (37) is arranged below the sealing plate (34). There are two vertical rods (38) and two fifth springs (39). The vertical rod (38) is fixedly mounted inside the gas collecting bottle (10). The vertical rod (38) passes through the upper and lower walls of the exhaust plate (37). The fifth spring (39) is sleeved on the vertical rod (38).

10. A gas sampling device for a gas wellhead according to claim 9, characterized in that: The exhaust plate (37) is a circular plate having the same size as the interior of the gas collecting bottle (10), and an exhaust port (40) is provided below the side wall of the gas collecting bottle (10).

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