CN210834362U - a gas sampler - Google Patents

Abstract

A gas sampler belongs to the technical field of gas samplers. The sampler comprises a first absorption device, a second absorption device, absorption liquid, a straight-through pipe and a gas collection bottle, wherein the first absorption device comprises an air inlet pipe a, a right-angle pneumatic connector, an air outlet pipe a, a bottle stopper a, an organic glass bottle a, a magnetic stirring device and a rotor, the second absorption device comprises an air inlet pipe b, an air outlet pipe b, a right-angle pneumatic connector, a bottle stopper b and an organic glass bottle b, and the absorption liquid is filled in the middle lower part of the organic glass bottle a and the organic glass bottle b respectively; the first absorption device and the second absorption device are connected through a straight-through pipe, and the gas collecting bottle is connected with the gas outlet pipe of the second absorption device. The sampler has the advantages of acid and alkali resistance, firmness and durability, difficult breakage, uniform aeration of the used aeration head, high absorption efficiency, accurate experiment and the like, makes up for the defects of the Meng's air suction bottle, and is particularly suitable for gas sampling experiments with high air suction rate under field conditions.

Description

a gas sampler

technical field

The utility model belongs to the technical field of gas samplers, in particular to a gas sampler.

Background technique

At present, most of the existing gas samplers choose Meng-type washing bottles made of glass as the container for the gas absorption liquid. The specifications of Meng-type washing bottles are relatively consistent and cannot be customized. Because most of the glass materials are used, it is easy to break. It is used in field monitoring experiments. , Often due to operational errors, the glass is broken, resulting in the failure of the experiment. When sampling, the air inlet and outlet of the Montenegro washing bottle usually need to be connected to the sampling pump with a silicone tube. In actual operation, the sealing performance is often not tight due to the unsuitable aperture of the silicone tube. In addition, the aeration head of the Mengshi bottle is small, and the aeration area is limited. When the air is pumped and sampled, the air flow passes through the aeration head quickly, which will form huge air bubbles. The absorption efficiency is reduced, especially when the pumping rate is high when the experiment is required, the bubble burst causes a very large loss of the absorption liquid, which brings great errors to the experiment; when the absorption liquid is poured out of the bottle, the manual error is large. , it is inconvenient for research on volatile gases.

Utility model content

Technical problems solved: In view of the technical problems of poor sealing, limited aeration area and large experimental errors in the prior art, the utility model provides a gas sampler, which has the characteristics of acid and alkali resistance, sturdiness and durability, and is not easily broken. The advantages of the aeration head used are uniform aeration, high absorption efficiency and accurate experiments, which make up for the defects of the Montenegro aspirating bottle.

Technical solution: a gas sampler, the sampler includes a first absorption device, a second absorption device, an absorption liquid, a straight pipe and a gas collecting bottle, the first absorption device includes an air inlet pipe a, a right-angle pneumatic joint, an outlet Trachea a, bottle stopper a, plexiglass bottle a, magnetic stirring device and rotor, the plexiglass bottle a includes a bottle body a, a vacuum suction branch pipe a, an absorbing liquid outlet a and a rubber stopper, and the bottle body a is the bottom A cylinder with a sealed end, an open top and an internal cavity, the vacuum suction branch pipe a is set at the top of the bottle body a, the absorbing liquid outlet a is set at the bottom edge of the bottle body a, and the rubber stoppers are respectively sealed for vacuum pumping. Trachea a and the absorbing liquid outlet a, the bottle stopper a is movably connected to the open end of the bottle body a, used to seal the bottle body a; the air inlet pipe a includes a tube body a and an aeration head, and the top of the tube body a is It is a thin cylindrical tube, the middle and bottom are thick cylindrical tubes with the inner diameter expanded by at least 2 times, the aeration head is connected to the bottom end of the tube body a, and the top of the tube body a is connected to one end of the right-angle pneumatic joint through the bottle stopper a , the rest of the tube body a is arranged inside the bottle body a, the aeration head is arranged at the bottom of the bottle body a and does not contact the bottom wall of the bottle body a; The air outlet is connected to one end of another right-angle pneumatic joint through the bottle stopper a; the rotor is arranged on the inner surface of the bottom wall of the bottle body a, and the plexiglass bottle a is movably connected to the top of the magnetic stirring device;

The second absorption device includes an air inlet pipe b, an air outlet pipe b, a right-angle pneumatic joint, a bottle stopper b and a plexiglass bottle b. The plexiglass bottle b includes a bottle body b, a vacuum suction branch pipe b, an absorption liquid outlet b and Rubber stopper, the bottle body b is a cylinder with a sealed bottom end, an open top end and an internal cavity, the vacuum suction branch pipe b is set at the top of the bottle body b, and the absorption liquid outlet b is set at the bottom end of the bottle body b On the edge, the rubber stopper seals the vacuum suction branch pipe b and the absorbing liquid outlet b respectively, and the bottle stopper b is movably connected to the open end of the bottle body b for sealing the bottle body b; the air inlet pipe b includes the pipe body b and The microporous short tube, the tube body b is an internal hollow cylindrical cavity with openings at both ends, the top of the tube body b is connected to one end of the right-angle pneumatic joint through the bottle stopper b, and the rest of the tube body b is arranged inside the bottle body b, so the The microporous short tube is an internal cavity cylinder with a sealed bottom end, an open top end and a microporous tube wall, the top of the microporous short tube is seamlessly connected with the bottom end of the tube body b, and the bottom end of the microporous short tube is close to the tube The inner surface of the bottom wall of the body b; the air inlet at the bottom end of the air outlet pipe b is arranged on the top of the bottle body b, and the top air outlet passes through the bottle stopper b and is connected with one end of another right-angle pneumatic joint;

The absorbing liquid is respectively filled in the lower part of the plexiglass bottle a and the plexiglass bottle b, and the filling height is respectively lower than the bottom end of the gas outlet pipe a and the gas outlet pipe b;

The straight-through pipe is a cylindrical pipe with a spherical protrusion at the intake end. The intake end of a straight-through pipe is connected to the other end of the right-angle pneumatic joint connected to the exhaust pipe a, and the right-angle pneumatic joint of the exhaust end is connected to the intake pipe b. The other end of the straight pipe is connected to the other end of the right-angle pneumatic joint; the intake end of one straight pipe is connected to the gas to be tested, and the gas outlet is connected to the other end of the right-angle pneumatic joint connected to the intake pipe a; the intake end of the other straight pipe is connected to the gas outlet pipe b. The other end of the joint is connected, and the gas outlet is connected with the air inlet of the gas collecting bottle.

Preferably, the diameter of the top of the bottle stopper a is larger than the diameter of the open end of the bottle body a, and the diameter of the bottom end is smaller than the diameter of the open end of the bottle body a; the diameter of the top end of the bottle stopper b is larger than the diameter of the open end of the bottle body b, and the diameter of the bottom end is smaller than the diameter of the bottle body a. b Diameter of open end.

Preferably, the air inlet pipe a, the air outlet pipe a, the straight pipe, the air inlet pipe b and the air outlet pipe b are respectively polytetrafluoroethylene hoses.

Preferably, the bottle stopper a and the bottle stopper b are silica gel stoppers.

Preferably, the aeration head is air stone, the air stone is sintered from white corundum, silicon carbide and emery, and the surface of the air stone is covered with pores with a diameter of 100 μm.

Preferably, the bottom ends of the plexiglass bottle a and the plexiglass bottle b are respectively wedge-shaped, and the absorbing liquid outlet a and the absorbing liquid outlet b are respectively located at the thinnest edges of the bottom ends of the plexiglass bottle a and the plexiglass bottle b.

Preferably, the outer surfaces of the plexiglass bottle a and the plexiglass bottle b are respectively provided with scales.

Preferably, the magnetic stirring device is a miniature magnetic stirrer.

Beneficial effects: 1. The new model collects the gas to be tested through the first absorption device and the second absorption device respectively. After the gas to be tested is initially absorbed by the first absorption device, it is further absorbed by the second absorption device, which can reduce the amount of gas to be measured. full of human error.

2. The new model can be used not only as a volatile gas sampling device, but also as a gas washing device. When used as a gas scrubbing device, the cleaned gas is collected through a gas collecting bottle; when used as a volatile gas sampling device, the absorbing liquid is poured out from the absorbing liquid outlet, and the volatile gas is further detected by detecting the absorbing liquid.

3. The new model is provided with a vacuum suction branch pipe on the top of the plexiglass bottle. When gas collection is performed, the air in the upper part of the plexiglass bottle is first extracted from the vacuum suction branch pipe with a vacuum pump. The effect of air on the sample collected in the gas collection bottle.

4. The absorbing liquid outlet of this new model is located at the bottom edge of the bottle body, and the bottom ends of the plexiglass bottle are respectively wedge-shaped, and the absorbing liquid outlet is located at the thinnest edge of the bottom end of the plexiglass bottle. Avoiding the absorption liquid from sticking to the bottle wall will reduce the absorption liquid and make the absorption liquid easier to be poured out.

5. There is an aeration head inside the first absorption device of this new type, and a magnetic stirring device at the bottom. The aeration head is made of air stone sintered from white corundum, silicon carbide and emery at a high temperature of 1500 ° C. The surface of the air stone is Filled with pores with a diameter of 100 μm, the generated bubbles are more delicate. The smaller the bubbles, the larger the contact area with the absorbing liquid, which improves the absorption efficiency. The loss of airflow, combined with agitation, can make the collected gas more easily absorbed or collected by the absorbing liquid.

6. The bottom end of the air inlet pipe of the new second absorption device is close to the inner surface of the bottom wall of the tube body b, and the gas is sputtered to the bottom of the bottle body b through the microporous short tube, which increases the contact area with the absorbing liquid and can absorb the maximum range. impurities in the gas.

7. The new plexiglass bottle is used as a container, which is sturdy and durable; the tetrafluoroethylene hose and the right-angle pneumatic joint are used as the air inlet and outlet channels, which are tightly connected and improve the air tightness; the air inlet pipe is transparent, and the air outlet pipe is orange The red color increases the recognition degree and avoids mistakes when connecting the pipeline; reduces the experimental error.

The gas sampler of the new type is especially suitable for gas sampling experiments with high pumping rate under field conditions.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the device according to the new model;

2 is a schematic structural diagram of a first absorption device;

3 is a schematic structural diagram of a second absorption device;

FIG. 4 is a schematic structural diagram of the intake pipe b of the second absorption device.

The numbers in the figure represent the following: 1. Inlet pipe a; 2. Right-angle pneumatic joint; 3. Air outlet pipe a; 4. Bottle stopper a; 5. Plexiglass bottle a; 6. Absorbing liquid; 8. Vacuum pumping branch pipe a; 9. Absorbing liquid outlet a; 10. Magnetic stirring device; 11. Rotor; 12. Scale; 13. Inlet pipe b; 14. Outlet pipe b; 15. Bottle stopper b; Glass bottle b; 17. Microporous short tube; 18. Vacuum suction branch pipe b; 19. Absorption liquid outlet b; 20. Gas collecting bottle; 21. Straight pipe.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Example 1

A gas sampler, see FIG. 1 , the sampler includes a first absorption device, a second absorption device, an absorption liquid, a straight pipe 21 and a gas collecting bottle 20 .

Referring to FIG. 2 , the first absorption device includes an air inlet pipe a1, a right-angle pneumatic joint 2, an air outlet pipe a 3, a bottle stopper a 4, a plexiglass bottle a 5, a magnetic stirring device 10 and a rotor 11, the plexiglass bottle a 5 includes a bottle body a, a vacuum suction branch pipe a8, an absorbing liquid outlet a 9 and a rubber stopper, the bottle body a is a cylinder with a sealed bottom end, an open top end and an internal cavity, and the vacuum suction branch pipe a8 is provided with On the top of the bottle body a, the absorbing liquid outlet a 9 is arranged on the edge of the bottom end of the bottle body a, the rubber stopper seals the vacuum suction branch pipe a 8 and the absorbing liquid outlet a 9 respectively, and the bottle stopper a 4 is movably connected to the The open end of the bottle body a is used to seal the bottle body a; the air inlet pipe a 1 includes a pipe body a and an aeration head 7, the top of the pipe body a is a cylindrical thin tube, and the inner diameter is enlarged at least 2 times in the middle and bottom The cylindrical thick pipe, the aeration head 7 is connected with the bottom end of the pipe body a, the top of the pipe body a is connected with one end of the right-angle pneumatic joint through the bottle stopper a 4, and the rest of the pipe body a is located inside the bottle body a, The aeration head 7 is arranged at the bottom of the bottle body a and does not contact the bottom wall of the bottle body a; the bottom air inlet of the air outlet pipe a 3 is arranged on the top of the bottle body a, and the top air outlet passes through the bottle stopper a 4 and another One end of the right-angle pneumatic joint is connected; the rotor 11 is arranged on the inner surface of the bottom wall of the bottle body a, and the organic glass bottle a 5 is movably connected to the top of the magnetic stirring device 10;

3 and 4, the second absorption device includes an air inlet pipe b 13, an air outlet pipe b 14, a right-angle pneumatic joint, a stopper b 15 and a plexiglass bottle b 16, the plexiglass bottle b 16 includes a bottle body b , the vacuum suction branch pipe b 18, the absorption liquid outlet b 19 and the rubber stopper, the bottle body b is a cylinder with a sealed bottom end, an open top end and an inner cavity, and the vacuum suction branch pipe b (18) is provided in the bottle On the top of the body b, the absorbing liquid outlet b 19 is arranged on the bottom edge of the bottle body b, the rubber stopper seals the vacuum suction branch pipe b 18 and the absorbing liquid outlet b 19 respectively, and the bottle stopper b 15 is movably connected to the bottle body b open end for sealing the bottle body b; the air inlet pipe b 13 includes a pipe body b and a microporous short pipe 17, the pipe body b is an inner hollow cylindrical cavity with open ends at both ends, and the top of the pipe body b passes through the bottle The plug b 15 is connected with one end of the right-angle pneumatic joint, and the rest of the tube body b is arranged inside the bottle body b. The top end of the microporous short tube 17 is seamlessly connected with the bottom end of the tube body b, and the bottom end of the microporous short tube 17 is close to the inner surface of the bottom wall of the tube body b; the air inlet at the bottom end of the air outlet tube b14 is arranged on the top of the bottle body b , the top air outlet is connected with one end of another right-angle pneumatic joint through the bottle stopper b 15;

The absorbing liquid is filled in the lower part of the plexiglass bottle a 5 and the plexiglass bottle b 16 respectively, and the filling height is respectively lower than the bottom end of the gas outlet pipe a 3 and the gas outlet pipe b 14;

The straight pipe 21 is a cylindrical pipe with a spherical protrusion at the intake end, the intake end of a straight pipe is connected with the other end of the right-angle pneumatic joint connected with the air outlet pipe a3, and the air outlet end is connected with the intake pipe b13. Connect the other end of the right-angle pneumatic connector; the inlet end of one straight pipe is connected with the gas to be tested, and the gas outlet end is connected with the other end of the right-angle pneumatic connector; The other end of the connected right-angle pneumatic joint is connected, and the gas outlet is connected with the air inlet of the gas collecting cylinder 20 .

The specific use process of the gas sampler is as follows: inject the absorption liquid 6 into the plexiglass bottle a 5 and the plexiglass bottle b 16 respectively, assemble the first absorption device and the second absorption device respectively, and then use a straight pipe to pass through a right-angle pneumatic joint. They are respectively connected with the air outlet pipe a 3 and the air inlet pipe b 13, and then use a straight pipe to connect the gas collecting cylinder 20 with the air outlet pipe b 14 through a right-angle pneumatic joint. Then use a vacuum pump to extract the air in the upper part of the plexiglass bottle a5 and the plexiglass bottle b16 from the vacuum evacuation branch pipe, then seal the vacuum evacuation branch pipe with a rubber stopper, and open the magnetic stirring device 10. The gas to be tested enters the plexiglass bottle a 5 through the air inlet pipe a 1 through the inlet end of a straight pipe, and the gas is dispersed into small molecular gas by the aeration stone 7, and the stirring effect of the rotor 11 can be more fully washed by the absorption liquid. After being washed, it enters the gas outlet pipe a 3 from the upper part of the bottle body a, and then enters the plexiglass bottle b 16 through the gas inlet pipe b 13 after being buffered by the straight pipe, and the gas is sputtered to the bottom of the bottle body b through the microporous short pipe, increasing the The contact area with the absorption liquid 6 is enlarged, and the impurities in the gas can be absorbed to the maximum extent. The gas washed by the absorption liquid enters the upper part of the bottle body b from the bottom of the absorption liquid, and then enters the gas collection through the gas outlet pipe b 14 and the straight pipe. Bottle 20, when detecting the absorbing liquid, remove the rubber stoppers of the absorbing liquid outlet a 9 and the absorbing liquid outlet b 19, and pour out the absorbing liquid, which can minimize human error and finally complete the gas collection process.

Example 2

Same as Example 1, the difference is that the height of the plexiglass bottle a 5 is 25 cm, and the diameter of the bottom of the bottle is 5 cm. The diameter of the top of the bottle stopper a 4 is larger than the diameter of the opening end of the bottle body a, and the diameter of the bottom end is smaller than the diameter of the opening end of the bottle body a. The size of the bottle stopper a 4 is 50.8 (small end diameter) × 62.7 (large end diameter) × 25 (height). ) mm, made of silicone plug. The diameter of the top cylindrical thin pipe of the intake pipe a 1 is 6 mm, the diameter of the middle and bottom cylindrical thick pipes is 12 mm, and the aeration head 7 is air stone, and the air stone is made of white corundum, silicon carbide and emery at 1500 ° C. Sintered at high temperature, the air stone is a spherical body with a diameter of 35 mm, and the surface of the air stone is covered with pores with a diameter of 100 μm, and the generated bubbles are more delicate. Absorption efficiency, when the bubbles burst out of the water surface, the splashed water droplets are small and will not be lost with the airflow, reducing the experimental error. The bottom end of the aeration head 7 is 3 cm away from the bottom wall of the bottle body a.

The plexiglass bottle b 16 has a height of 30 cm and a bottom diameter of 5 cm. The diameter of the top of the stopper b 15 is larger than the diameter of the open end of the bottle body b, and the diameter of the bottom end is smaller than the diameter of the open end of the bottle body b. Silicone stopper. The diameter of the air intake pipe b 13 is 6 mm, and the height of the micro-porous short pipe 17 is 1 cm.

The air inlet ends of the air outlet pipe a 3 (the air outlet pipe b 14 ) are respectively arranged on the top of the bottle body a (bottle body b) and 2 cm away from the lower surface of the bottle stopper a 4 (the bottle stopper b 15 ). The air inlet end of the air inlet pipe a1 (the air inlet pipe b 13) passes through the bottle body a (bottle body b) and is 4 cm higher than the upper surface of the bottle stopper a4 (the bottle stopper b 15). The air intake pipe a1 and the air intake pipe b13 are respectively transparent, and the air outlet pipe a3 and the air outlet pipe b14 are respectively orange-red, so as to increase the recognition degree and avoid mistakes when connecting the pipes.

The bottom ends of the organic glass bottle a 5 and the organic glass bottle b 16 are respectively wedge-shaped, and the absorbing liquid outlet a 9 and the absorbing liquid outlet b 19 are respectively arranged on the thinnest edges of the bottom ends of the organic glass bottle a 5 and the organic glass bottle b 16. When pouring the absorbing liquid, it can minimize human error and make the liquid in the bottle easier to be poured out. The outer surfaces of the plexiglass bottle a 5 and the plexiglass bottle b 16 are respectively provided with scales 12 , which can facilitate the operator to read the volume of the absorbing liquid. The magnetic stirring device 10 is a miniature magnetic stirrer, and the magnetic stirring device 10 is used to stir the absorption liquid, so that the gas can be more fully integrated into the absorption liquid.

The air inlet pipe a 1 , the air outlet pipe a 3 , the straight pipe, the air inlet pipe b 13 and the air outlet pipe b 14 are respectively polytetrafluoroethylene hoses. The inner diameter of the right-angle pneumatic joint 2 is 6 mm, and each right-angle pneumatic joint is respectively connected with the air inlet end of the intake pipe and the outlet end of the air outlet pipe. air tightness.

Example 3

Using the device of Example 2, taking farmland ammonia volatilization sampling as an example, the specific use process is as follows:

Insert the ammonia volatilization sampling hood into the farmland at a depth of 5 cm, and connect the sampling hood, the gas sampler prepared in Example 2 with the straight-through pipe connected to the air inlet pipe a1, and the suction pump in turn by using a PVC rigid pipe. In this embodiment, the absorbing liquid 6 is dilute sulfuric acid. Before starting monitoring, firstly, 100 mL of dilute sulfuric acid was evenly divided into two parts and added to the first absorption device and the second absorption device respectively. Then turn on the air pump, and the air flow is 20 L/min. Select 8:00-10:00 to carry out field monitoring work. After pumping, put the absorption liquid in the gas sampler into a plastic bottle and bring it back to the laboratory to measure NH ₄ ⁺ -N in the absorption liquid with indophenol blue colorimetrically. concentration. According to the sampling time and the area of the sampling hood, the amount of ammonia volatilization in the farmland was calculated.

Claims (8)

1. A gas sampler, characterized in that the sampler comprises a first absorption device, a second absorption device, an absorption liquid, a straight pipe (21) and a gas collecting bottle (20), The first absorption device comprises an air inlet pipe a (1), a right-angle pneumatic joint, an air outlet pipe a (3), a bottle stopper a (4), a plexiglass bottle a (5), a magnetic stirring device (10) and a rotor (11) ), the plexiglass bottle a (5) includes a bottle body a, a vacuum evacuation branch pipe a (8), an absorbing liquid outlet a (9) and a rubber stopper, and the bottle body a is sealed at the bottom, open at the top and has an internal The cylinder of the cavity, the vacuum pumping branch pipe a (8) is set on the top of the bottle body a, the absorption liquid outlet a (9) is set on the bottom edge of the bottle body a, and the rubber stoppers are respectively sealed for vacuum pumping The branch pipe a (8) and the absorbing liquid outlet a (9), the bottle stopper a (4) is movably connected to the open end of the bottle body a to seal the bottle body a; the air inlet pipe a (1) includes the pipe body a and the aeration head (7), the top of the tube body a is a thin cylindrical tube, the middle and bottom are thick cylindrical tubes with an inner diameter expanded by at least 2 times, and the aeration head (7) is connected to the bottom end of the tube body a , the top of the tube body a is connected to one end of the right-angle pneumatic joint through the bottle stopper a (4), the rest of the tube body a is set inside the bottle body a, and the aeration head (7) is set at the bottom of the bottle body a and is connected to the bottle body a The bottom wall is not in contact; the air inlet at the bottom end of the air outlet pipe a (3) is arranged on the top of the bottle body a, and the air outlet at the top passes through the bottle stopper a (4) and is connected to one end of another right-angle pneumatic joint; the rotor ( 11) It is arranged on the inner surface of the bottom wall of the bottle body a, and the organic glass bottle a (5) is movably connected to the top of the magnetic stirring device (10); The second absorption device includes an air inlet pipe b (13), an air outlet pipe b (14), a right-angle pneumatic joint, a bottle stopper b (15) and a plexiglass bottle b (16), and the plexiglass bottle b (16) includes Bottle body b, vacuum suction branch pipe b (18), absorption liquid outlet b (19) and rubber stopper, the bottle body b is a cylinder with a sealed bottom end, an open top end and an internal cavity, the vacuum suction branch pipe b(18) is arranged on the top of the bottle body b, the absorption liquid outlet b(19) is arranged at the bottom edge of the bottle body b, and the rubber stopper seals the vacuum suction branch pipe b(18) and the absorption liquid outlet b(19) respectively. ), the bottle stopper b (15) is movably connected to the open end of the bottle body b for sealing the bottle body b; the air inlet pipe b (13) includes a pipe body b and a microporous short pipe (17), the pipe body b It is an internal hollow cylindrical cavity with openings at both ends. The top of the tube body b is connected to one end of the right-angle pneumatic joint through the bottle stopper b (15), and the rest of the tube body b is arranged inside the bottle body b. The microporous short tube (17) is an inner cavity cylinder with a sealed bottom end, an open top end, and a microporous tube wall. The top end of the microporous short tube (17) is seamlessly connected with the bottom end of the tube body b. The bottom end is close to the inner surface of the bottom wall of the pipe body b; the air inlet at the bottom end of the air outlet pipe b (14) is arranged on the top of the bottle body b, and the top air outlet passes through the bottle stopper b (15) and one end of another right-angle pneumatic joint connect; The absorbing liquid is respectively filled in the lower part of the plexiglass bottle a (5) and the plexiglass bottle b (16), and the filling height is respectively lower than the bottom ends of the air outlet pipe a (3) and the air outlet pipe b (14); The straight pipe (21) is a cylindrical pipe with a spherical protrusion at the intake end, the intake end of one straight pipe is connected to the other end of the right-angle pneumatic joint connected to the air outlet pipe a (3), and the air outlet end is connected to the intake pipe b. (13) The other end of the connected right-angle pneumatic joint is connected; the inlet end of one straight pipe is connected to the gas to be measured, and the gas outlet is connected to the other end of the right-angle pneumatic joint connected to the intake pipe a (1); the other straight pipe The air inlet end is connected to the other end of the right-angle pneumatic joint connected to the air outlet pipe b (14), and the air outlet end is connected to the air inlet of the gas collecting bottle (20). 2. A gas sampler according to claim 1, characterized in that the diameter of the top of the stopper a (4) is larger than the diameter of the open end of the bottle body a, and the diameter of the bottom end is smaller than the diameter of the open end of the bottle body a; the The diameter of the top of the stopper b (15) is larger than the diameter of the open end of the bottle body b, and the diameter of the bottom end is smaller than the diameter of the open end of the bottle body b. 3 . The gas sampler according to claim 1 , wherein the gas inlet pipe a ( 1 ), the gas outlet pipe a ( 3 ), the straight pipe, the gas inlet pipe b ( 13 ) and the gas outlet pipe b ( 14 ) ) are PTFE hoses, respectively. 4 . The gas sampler according to claim 1 , wherein the stopper a ( 4 ) and the stopper b ( 15 ) are silicone stoppers. 5 . 5 . The gas sampler according to claim 1 , wherein the aeration head ( 7 ) is air stone, and the air stone is sintered from white corundum, silicon carbide and emery, and the air bubbles are sintered. 6 . The stone surface is covered with pores with a diameter of 100 μm. 6. A gas sampler according to claim 1, characterized in that the bottom ends of the plexiglass bottle a (5) and the plexiglass bottle b (16) are respectively wedge-shaped, and the absorbing liquid outlet a (9) and The absorbing liquid outlet b (19) is respectively provided at the thinnest edge of the bottom end of the plexiglass bottle a (5) and the plexiglass bottle b (16). 7 . The gas sampler according to claim 1 , wherein the outer surfaces of the plexiglass bottle a ( 5 ) and the plexiglass bottle b ( 16 ) are respectively provided with scales. 8 . 8 . The gas sampler according to claim 1 , wherein the magnetic stirring device ( 10 ) is a miniature magnetic stirring device. 9 .

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