Exhaust assemblies for gas chromatographs

Abstract

The present invention relates to the technical field of tail gas treatment, and discloses a tail gas discharge assembly for a gas chromatograph, comprising a base, an adsorption tube connected to the base, and a top cover connected to the adsorption tube, an air outlet pipe and an air inlet pipe are provided at the bottom of the adsorption tube, a plurality of adsorption bottles are installed in the adsorption tube in the vertical direction, the bottom surface of the adsorption tube and the bottom of the lower adsorption bottle, the two adsorption bottles, and the top of the upper adsorption bottle and the bottom surface of the top cover are all connected by a connecting assembly, an air guide pipe is provided in the top cover, one end of the air guide pipe is connected to the upper adsorption bottle, and the other end is connected to the inside of the adsorption tube, the bottom of the lower adsorption bottle is connected to the air inlet pipe, and an adsorbent is installed in the adsorption bottle. This tail gas discharge assembly for a gas chromatograph uses a plurality of adsorption bottles to load the adsorbent, can more effectively utilize the adsorption capacity of the adsorbent, reduce the waste of the adsorbent, and reduce the experimental cost.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas treatment, in particular to a tail gas exhaust component for a gas chromatograph. Background Art

[0002] Gas chromatograph is an instrument that uses chromatographic separation technology and detection technology to perform qualitative and quantitative analysis on complex mixtures of multiple components. Gas chromatographs will produce a large amount of exhaust gas during the analytical test, which may contain harmful gases such as carbon monoxide, carbon dioxide, nitrogen oxides, organic volatiles, etc. If the exhaust gas is directly discharged into the laboratory, it will threaten the health of the experimenters and pollute the laboratory environment. Therefore, the exhaust gas needs to be treated by the exhaust gas exhaust component before discharge, and the exhaust gas is treated by physical adsorption and other methods to ensure that the discharged exhaust gas will not affect the experimenters.

[0003] The general exhaust gas discharge components include a base, an adsorption tube and a pipeline. When in use, different types of adsorbents, such as activated carbon, molecular sieve, etc., are installed in multiple adsorption tubes respectively, and then the adsorption tubes are installed on the base. The adsorption tubes are connected to the gas chromatograph using pipelines, and then the exhaust gas is introduced. As the exhaust gas continues to circulate, the harmful components in the exhaust gas will gradually be adsorbed by the adsorbents in each adsorption tube, so that the exhaust gas meets safety standards before being discharged to the outside.

[0004] As in the prior art, the patent with the authorization announcement number CN213942658U discloses a gas chromatograph tail gas exhaust device, including a liquid bottle, a first sealing cover movably mounted on the top of the liquid bottle, an inlet is provided on one side of the upper part of the first sealing cover, a rubber hose is movably mounted inside the inlet, and a first connection port is provided on the other side of the upper part of the first sealing cover. The above-mentioned gas chromatograph tail gas exhaust device inserts the gas diluted by the solution into a sealed activated carbon bottle containing activated carbon through the connecting pipe on the upper part of the sealed liquid bottle, absorbs the gas insoluble in water, and completely reduces the concentration of harmful gases. The other end of the exhaust pipe is connected to the outside to discharge the gas outside, and finally achieves the purpose of exhausting waste gas and reducing the risk of analytical experiments. The concentration of harmful gases is reduced after two dilutions, which reduces the pollution to the environment and protects the health of the experimenters.

[0005] However, the existing exhaust gas exhaust components have certain defects when in use: after a period of use, the adsorbent in the adsorption tube of the existing exhaust gas exhaust components will become saturated. Since the exhaust gas enters the adsorbent from below, the adsorbent at the bottom will be saturated first. At this time, in order to ensure the adsorption effect of the exhaust gas, experimenters usually replace all the adsorbents in the entire adsorption tube with new adsorbents. Since only the adsorbent at the bottom has reached saturation and the adsorption capacity of the adsorbent at the top has not been fully utilized, replacing all the adsorbents in the adsorption tube will result in a waste of adsorbents and increase the experimental cost. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides a tail gas exhaust component for a gas chromatograph to reduce the waste of adsorbent.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an exhaust gas exhaust component for a gas chromatograph, comprising a base, an adsorption tube connected to the base and a top cover connected to the adsorption tube, an air outlet pipe and an air inlet pipe are provided at the bottom of the adsorption tube, a plurality of adsorption bottles are vertically installed in the adsorption tube, the inner bottom surface of the adsorption tube and the bottom of the lower adsorption bottle, between two adsorption bottles, and between the top of the upper adsorption bottle and the inner bottom surface of the top cover are all connected by a connecting component, an air guide pipe is provided in the top cover, one end of the air guide pipe is connected to the upper adsorption bottle, and the other end is connected to the inside of the adsorption tube, the bottom of the lower adsorption bottle is connected to the air inlet pipe, and an adsorbent is installed in the adsorption bottle.

[0008] Furthermore, the connecting component includes a fixed block, a connecting block, a flow limiting ball, a flow limiting spring, a flow stopping ball and a flow stopping spring. The inner bottom surface of the adsorption tube and the top surface of the adsorption bottle are fixedly connected with the fixed block, the bottom surface of the top cover and the bottom surface of the adsorption bottle are fixedly connected with the connecting block, the positions of the fixed block and the connecting block correspond, a limited flow groove is provided at the bottom of the fixed block, a limited flow ball is slidably connected in the flow limiting groove, a limited flow spring is fixedly connected between the flow limiting ball and the bottom surface of the flow limiting groove, a flow stopping groove is provided at the bottom of the connecting block, a flow stopping ball is slidably connected in the flow stopping groove, a flow stopping spring is fixedly connected between the flow stopping ball and the bottom surface of the flow stopping groove, and an extrusion component is connected to the top of the fixed block.

[0009] Furthermore, the extrusion assembly includes a moving block and an insertion rod. A moving groove is provided on the top of the fixed block. The moving block is slidably connected in the moving groove. The moving block is fixedly connected to the insertion rod on the upper and lower sides. The two insertion rods correspond to the positions of the flow limiting ball and the flow stop ball respectively. A plurality of air guide grooves are provided on the surface of the moving block.

[0010] Furthermore, a ball valve is fixedly connected to the middle of the air guide pipe, and the top end of the ball valve shaft penetrates the surface of the top cover and is fixedly connected to a handle.

[0011] Furthermore, a connecting pipe is fixedly connected to the inner bottom surface of the adsorption tube, the connecting pipe is communicated with the air outlet pipe, a silicone sheet is fixedly connected to the top of the connecting tube, and the middle part of the silicone sheet is a valve-type arrangement.

[0012] Furthermore, a clamping groove is provided at the bottom of the connecting block, a clamping ring is slidably connected in the clamping groove, a sealing ring is fixedly connected to the outer wall of the clamping ring, and an extrusion groove corresponding to the position of the sealing ring is provided on the surface of the fixed block.

[0013] Furthermore, a plurality of positioning plates are fixedly connected to the inner wall of the adsorption tube, and the outer wall of the positioning plate is in contact with the outer wall of the adsorption bottle.

[0014] Furthermore, the adsorption bottle includes a placement tube and a connecting sleeve, the inner wall of the bottom of the connecting sleeve is threadedly connected to the outer wall of the top of the placement tube, the fixing block is fixedly connected to the top of the connecting sleeve, and the connecting block is fixedly connected to the bottom of the placement tube.

[0015] Furthermore, one end of the insertion rod away from the moving block is fixedly connected with a silicone pad, and the silicone pad is respectively fitted with the outer walls of the flow limiting ball and the flow stopping ball.

[0016] Furthermore, a plurality of anti-slip strips are fixedly connected to the outer wall of the top cover.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The tail gas exhaust assembly for gas chromatograph uses multiple adsorption bottles to load adsorbents, which can more effectively utilize the adsorption capacity of the adsorbents, reduce the waste of adsorbents, and reduce experimental costs. At the same time, the adsorbent is replaced by removing the entire adsorption bottle, which can avoid air pollution caused by the volatilization of harmful substances attached to the adsorbent when the adsorbent is directly poured out, improve the operational safety of the experimenter in the process of replacing the adsorbent, avoid threats to the environment and the health of the experimenter, and simplify the operation process of replacing the adsorbent, improve the replacement efficiency of the adsorbent, save time, and improve work efficiency;

[0019] 2. The cooperation between the flow limiting ball and the flow stopping ball can achieve the sealing of both ends of the adsorption bottle, thereby preventing the leakage of harmful substances at both ends of the adsorption bottle after the adsorption bottle is taken out, thereby further protecting the environment and the health of the experimenters and ensuring the safety of the experimenters;

[0020] 3. By detecting whether there is air overflow at the end of the exhaust pipe, the sealing between the fixed block and the connecting block can be determined, and the leaking part can be adjusted in time to avoid leakage accidents in the subsequent exhaust gas treatment process, thereby ensuring the stability and reliability of the entire exhaust gas exhaust assembly. The experimenter can visually observe whether the valve is deformed or opened, so as to quickly determine whether the sealing between the fixed block and the connecting block is good, thereby improving the efficiency and accuracy of sealing detection and bringing convenience to the experimenter. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the three-dimensional cross-sectional structure of the adsorption tube, adsorption bottle and connecting assembly of the present invention;

[0023] Figure 3 It is a schematic diagram of the three-dimensional cross-sectional structure of the adsorption tube, the fixing block and the connecting tube of the present invention;

[0024] Figure 4 It is a three-dimensional cross-sectional structural schematic diagram of the fixed block, the flow-limiting ball, the moving block and the insertion rod of the present invention;

[0025] Figure 5 It is a three-dimensional structural schematic diagram of the moving block and the insertion rod of the present invention;

[0026] Figure 6 It is a schematic diagram of the three-dimensional cross-sectional structure of the connecting tube and the silicone sheet of the present invention;

[0027] Figure 7 It is a schematic diagram of the three-dimensional cross-sectional structure of the adsorption bottle of the present invention;

[0028] Figure 8 It is a schematic diagram of the three-dimensional split cross-sectional structure of the connecting block, the flow-stopping ball and the sealing ring of the present invention;

[0029] Fig. 9 It is a schematic diagram of the three-dimensional cross-sectional structure of the top cover, ball valve and handle of the present invention;

[0030] Fig.10 for Figure 2 Schematic diagram of the enlarged three-dimensional cross-sectional structure at point A above.

[0031] In the figure: 1. base; 2. adsorption tube; 3. top cover; 4. air outlet pipe; 5. air inlet pipe; 6. adsorption bottle; 7. air guide pipe; 8. fixing block; 9. connecting block; 10. flow limiting groove; 11. flow limiting ball; 12. flow limiting spring; 13. flow stopping groove; 14. flow stopping ball; 15. flow stopping spring; 16. moving groove; 17. moving block; 18. plug rod; 19. air guide groove; 20. silicone pad; 21. ball valve; 22. handle; 23. connecting pipe; 24. silicone sheet; 25. snap-in groove; 26. sealing ring; 27. anti-slip strip; 28. positioning plate; 29. ​​extrusion groove; 30. snap-in ring; 61. placement tube; 62. connecting sleeve. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] See also Figures 1 to 10 , an exhaust gas exhaust component for a gas chromatograph comprises a base 1, an adsorption tube 2 connected to the base 1 and a top cover 3 connected to the adsorption tube 2, an air outlet pipe 4 and an air inlet pipe 5 are provided at the bottom of the adsorption tube 2, a plurality of adsorption bottles 6 are vertically installed in the adsorption tube 2, the bottom surface of the inner part of the adsorption tube 2 and the bottom of the lower adsorption bottle 6, between the two adsorption bottles 6, and between the top of the upper adsorption bottle 6 and the bottom surface of the inner part of the top cover 3 are all connected by a connecting component, an air guide pipe 7 is provided in the top cover 3, one end of the air guide pipe 7 is connected to the upper adsorption bottle 6, and the other end is connected to the inside of the adsorption tube 2, the bottom of the lower adsorption bottle 6 is connected to the air inlet pipe 5, and an adsorbent is installed in the adsorption bottle 6.

[0034] The tail gas exhaust assembly for gas chromatograph in the present invention, when treating tail gas, the tail gas enters the lower adsorption bottle 6 through the air inlet pipe 5, then enters the upper adsorption bottle 6, and then enters the gap between the adsorption bottle 6 and the adsorption tube 2 through the air guide pipe 7, and finally is discharged from the air outlet pipe 4 at the bottom of the adsorption tube 2 to enter the next treatment process; after long-term use, the adsorbent in the bottom adsorption bottle 6 will be saturated. At this time, the experimenter opens the top cover 3, and then takes out the adsorption bottles 6 in turn, then removes the bottom adsorption bottle 6, puts the top adsorption bottle 6 into the bottom of the adsorption tube 2, and then puts an adsorption bottle 6 filled with a new adsorbent in the adsorption tube 2, and closes the top cover 3, thereby realizing the replacement of the adsorbent, ensuring that the adsorption effect of the tail gas will not decrease;

[0035] Using multiple adsorption bottles 6 to load the adsorbent can more effectively utilize the adsorption capacity of the adsorbent, reduce the waste of the adsorbent, and reduce the experimental cost. At the same time, the method of removing the entire adsorbent from the adsorption bottle 6 for replacement can avoid air pollution caused by the volatilization of harmful substances attached to the adsorbent when the adsorbent is directly poured out, thereby improving the operational safety of the experimenters in the process of replacing the adsorbent, avoiding threats to the environment and the health of the experimenters, and simplifying the operating procedures for replacing the adsorbent, thereby improving the efficiency of replacing the adsorbent, saving time, and improving work efficiency.

[0036] As a preferred technical solution of the present invention, the connecting component includes a fixed block 8, a connecting block 9, a flow limiting ball 11, a flow limiting spring 12, a flow stopping ball 14 and a flow stopping spring 15. The inner bottom surface of the adsorption tube 2 and the top surface of the adsorption bottle 6 are fixedly connected with the fixed block 8, the bottom surface of the top cover 3 and the bottom surface of the adsorption bottle 6 are fixedly connected with the connecting block 9, the fixed block 8 and the connecting block 9 correspond in position, a limited flow groove 10 is provided at the bottom of the fixed block 8, the limited flow ball 11 is slidably connected in the flow limiting groove 10, and the limited flow spring 12 is fixedly connected between the flow limiting ball 11 and the bottom surface of the flow limiting groove 10, a flow stopping groove 13 is provided at the bottom of the connecting block 9, a flow stopping groove 13 is slidably connected with the flow stopping ball 14, a flow stopping spring 15 is fixedly connected between the flow stopping ball 14 and the bottom surface of the flow stopping groove 13, and an extrusion component is connected to the top of the fixed block 8.

[0037] Specifically, when the experimenter opens the top cover 3 to replace the adsorbent, the extrusion assembly will be cancelled at the moment of opening the top cover 3. At this time, the flow limiting ball 11 and the flow stopping ball 14 of the fixed block 8 and the connecting block 9 will respectively fit with the inner walls of the flow limiting groove 10 and the flow stopping groove 13 under the action of the flow limiting spring 12 and the flow stopping spring 15, thereby blocking the flow limiting groove 10 and the flow stopping groove 13. At this time, the experimenter takes out the adsorption bottle 6 from the adsorption tube 2, places it on the desktop, and replaces the adsorbent; the cooperation of the flow limiting ball 11 and the flow stopping ball 14 can achieve sealing of the two ends of the adsorption bottle 6, thereby avoiding leakage of harmful substances at both ends of the adsorption bottle 6 after the adsorption bottle 6 is taken out, thereby further protecting the environment and the health of the experimenters and ensuring the safety of the experimenters.

[0038] As a preferred technical solution of the present invention, the extrusion assembly includes a moving block 17 and an insertion rod 18. A moving groove 16 is opened on the top of the fixed block 8, and the moving block 17 is slidably connected in the moving groove 16. The moving block 17 is fixedly connected to the insertion rod 18 on the upper and lower sides. The two insertion rods 18 correspond to the positions of the flow limiting ball 11 and the flow stop ball 14 respectively. A plurality of air guide grooves 19 are opened on the surface of the moving block 17.

[0039] Specifically, when the experimenter puts the adsorption bottle 6 into the adsorption tube 2, the rod 18 will respectively abut against the flow limiting ball 11 and the flow stopping ball 14. Then, when the experimenter screws on the top cover 3, the top cover 3 will apply pressure to the fixed block 8 and the connecting block 9. At this time, the flow limiting ball 11 will squeeze the rod 18, driving the moving block 17 to move downward. At this time, the rod 18 located below the moving block 17 will squeeze the flow stopping ball 14 and compress the flow stopping spring 15, so that the flow stopping ball 14 is separated from the inner wall of the flow stopping groove 13. When the moving block 17 moves down to the bottom of the moving groove 16, the lower rod 18 no longer applies pressure to the flow stopping ball 14, and the upper rod 18 in turn applies pressure to the flow limiting ball 11 due to the cessation of movement of the moving block 17, so that the flow limiting spring 12 is compressed, and the flow limiting ball 11 is separated from the inner wall of the flow limiting groove 10. Through the above steps, the air flow channels at the upper and lower ends of the adsorption bottle 6 are opened, thereby allowing the exhaust gas to enter the adsorption bottle 6 for adsorption.

[0040] As a preferred technical solution of the present invention, a ball valve 21 is fixedly connected to the middle of the air guide tube 7 , and the top end of the rotating shaft of the ball valve 21 penetrates the surface of the top cover 3 and is fixedly connected to a handle 22 .

[0041] Specifically, after installing the adsorption bottle 6 and the top cover 3, the experimenter can use the handle 22 to close the ball valve 21, and then introduce air into the adsorption bottle 6 through the air inlet pipe 5. Since the air guide pipe 7 is closed by the ball valve 21, the air will stay in the adsorption bottle 6. At this time, if there is a gap between the fixed block 8 and the connecting block 9, and the seal is not firm, air will leak out from these gaps. By detecting whether there is air overflow at the end of the outlet pipe 4, the sealing between the fixed block 8 and the connecting block 9 can be judged, and the leaking part can be adjusted in time to avoid leakage accidents in the subsequent exhaust gas treatment process, thereby ensuring the stability and reliability of the entire exhaust gas exhaust assembly.

[0042] As a preferred technical solution of the present invention, a connecting tube 23 is fixedly connected to the bottom surface of the adsorption tube 2, the connecting tube 23 is connected to the air outlet pipe 4, and a silicone sheet 24 is fixedly connected to the top of the connecting tube 23, and the middle part of the silicone sheet 24 is a valve-like arrangement.

[0043] Specifically, when the device is not in operation, the valve in the middle of the silicone sheet 24 will block the connecting tube 23 to prevent gas from entering the outlet pipe 4; when performing a sealing test, as air is continuously introduced, when a gap appears between the fixed block 8 and the connecting block 9, air will continuously enter the gap between the adsorption bottle 6 and the adsorption tube 2, and the air pressure will continue to increase. Under the pressure of the gas, the valve in the middle of the silicone sheet 24 will be pressed open, resulting in a gap to allow gas to pass through; therefore, when performing a sealing test, the experimenter can visually observe whether the valve is deformed or opened, thereby quickly judging whether the sealing between the fixed block 8 and the connecting block 9 is good, thereby improving the efficiency and accuracy of sealing detection and bringing convenience to the experimenter.

[0044] As a preferred technical solution of the present invention, a snap-in groove 25 is provided at the bottom of the connecting block 9, a snap-in ring 30 is slidably connected in the snap-in groove 25, a sealing ring 26 is fixedly connected to the outer wall of the snap-in ring 30, and an extrusion groove 29 corresponding to the position of the sealing ring 26 is provided on the surface of the fixed block 8.

[0045] Specifically, by opening a snap-in groove 25 at the bottom of the connecting block 9 and slidingly connecting the snap-in ring 30, and fixing the sealing ring 26 on the outer wall of the snap-in ring 30, the sealing effect between the fixed block 8 and the connecting block 9 is enhanced. When the snap-in ring 30 completely slides into the snap-in groove 25 and is squeezed by the extrusion groove 29 on the surface of the fixed block 8, the sealing ring 26 will be deformed and fit tightly between the fixed block 8 and the connecting block 9 to form a solid sealing barrier. This design not only effectively prevents the leakage of exhaust gas, but also greatly enhances the stability of the connection part.

[0046] As a preferred technical solution of the present invention, a plurality of positioning plates 28 are fixedly connected to the inner wall of the adsorption tube 2 , and the outer wall of the positioning plate 28 is in contact with the outer wall of the adsorption bottle 6 .

[0047] Specifically, when the experimenter puts the adsorption bottle 6, the positioning plate 28 will fix the adsorption bottle 6, ensure that the fixing block 8 is aligned with the connecting block 9, and ensure that the insertion rod 18 is stably in contact with the flow-limiting ball 11, which brings convenience to the experimenter.

[0048] As a preferred technical solution of the present invention, the adsorption bottle 6 includes a placement tube 61 and a connecting sleeve 62, the inner wall at the bottom of the connecting sleeve 62 is threadedly connected to the outer wall at the top of the placement tube 61, the fixing block 8 is fixedly connected to the top of the connecting sleeve 62, and the connecting block 9 is fixedly connected to the bottom of the placement tube 61.

[0049] Specifically, after taking out the adsorption bottle 6 saturated with adsorbent, the experimenter can move the adsorption bottle 6 to a safe environment, and then screw the connecting sleeve 62. At this time, the adsorption bottle 6 can be opened, and the saturated adsorbent in the placement tube 61 can be poured out and enter other devices for regeneration. Then, the placement tube 61 and the connecting sleeve 62 are cleaned and dried, refilled with new adsorbent, and the connecting sleeve 62 is screwed on to facilitate the next replacement of the adsorbent.

[0050] As a preferred technical solution of the present invention, one end of the insertion rod 18 away from the moving block 17 is fixedly connected to a silicone pad 20, and the silicone pad 20 is respectively in contact with the outer walls of the flow limiting ball 11 and the flow stopping ball 14.

[0051] Specifically, the shape of the silicone pad 20 is precisely designed to be an arc that matches the outer walls of the flow limiting ball 11 and the flow stop ball 14 , ensuring that the silicone pad 20 stably contacts the outer walls of the flow limiting ball 11 and the flow stop ball 14 , squeezing the flow limiting ball 11 and the flow stop ball 14 .

[0052] As a preferred technical solution of the present invention, a plurality of anti-slip strips 27 are fixedly connected to the outer wall of the top cover 3 .

[0053] Specifically, the shape of the anti-slip strip 27 is designed to be a raised strip structure, which forms a plurality of parallel ridges on the outer wall of the top cover 3. This design increases the contact area between the fingers and the top cover 3, and provides additional friction through the raised shape, thereby effectively preventing the occurrence of hand slippage.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An exhaust gas exhaust assembly for a gas chromatograph, comprising a base (1), an adsorption tube (2) connected to the base (1), and a top cover (3) connected to the adsorption tube (2), characterized in that: An air outlet pipe (4) and an air inlet pipe (5) are provided at the bottom of the adsorption tube (2); a plurality of adsorption bottles (6) are installed vertically in the adsorption tube (2); the bottom surface of the adsorption tube (2) and the bottom of the lower adsorption bottle (6), between the two adsorption bottles (6), and between the top of the upper adsorption bottle (6) and the bottom surface of the top cover (3) are all connected via a connecting assembly; an air guide pipe (7) is provided in the top cover (3); one end of the air guide pipe (7) is connected to the upper adsorption bottle (6), and the other end is connected to the inside of the adsorption tube (2); the bottom of the lower adsorption bottle (6) is connected to the air inlet pipe (5); an adsorbent is installed in the adsorption bottle (6); The connection assembly comprises a fixed block (8), a connection block (9), a flow-limiting ball (11), a flow-limiting spring (12), a flow-stopping ball (14) and a flow-stopping spring (15); the inner bottom surface of the adsorption tube (2) and the top surface of the adsorption bottle (6) are both fixedly connected with the fixed block (8); the bottom surface of the top cover (3) and the bottom surface of the adsorption bottle (6) are both fixedly connected with the connection block (9); the fixed block (8) and the connection block (9) are located correspondingly; a flow-limiting groove (10) is provided on the top of the connection block (9); the flow-limiting ball (11) is slidably connected in the flow-limiting groove (10); the flow-limiting spring (12) is fixedly connected between the flow-limiting ball (11) and the top surface of the flow-limiting groove (10); a flow-stopping groove (13) is provided at the bottom of the fixed block (8); the flow-stopping ball (14) is slidably connected in the flow-stopping groove (13); the flow-stopping spring (15) is fixedly connected between the flow-stopping ball (14) and the bottom surface of the flow-stopping groove (13); and the top of the fixed block (8) is connected with an extrusion assembly; The extrusion assembly comprises a moving block (17) and an insertion rod (18); a moving groove (16) is provided on the top of the fixed block (8); the moving block (17) is slidably connected in the moving groove (16); the insertion rods (18) are fixedly connected to the upper and lower sides of the moving block (17); the two insertion rods (18) correspond to the positions of the flow-limiting ball (11) and the flow-stopping ball (14) respectively; and a plurality of air guide grooves (19) are provided on the surface of the moving block (17).

2. The tail gas exhaust assembly for a gas chromatograph according to claim 1, characterized in that: A ball valve (21) is fixedly connected to the middle of the air guide tube (7), and the top end of the rotating shaft of the ball valve (21) penetrates the surface of the top cover (3) and is fixedly connected to a handle (22).

3. The tail gas exhaust assembly for a gas chromatograph according to claim 2, characterized in that: The bottom surface of the adsorption tube (2) is fixedly connected to a connecting tube (23), the connecting tube (23) is connected to the air outlet tube (4), the top of the connecting tube (23) is fixedly connected to a silicone sheet (24), and the middle part of the silicone sheet (24) is arranged in a valve-like manner.

4. The tail gas exhaust assembly for a gas chromatograph according to claim 3, characterized in that: The bottom of the connecting block (9) is provided with a snap-fit ​​groove (25), a snap-fit ​​ring (30) is slidably connected in the snap-fit ​​groove (25), a sealing ring (26) is fixedly connected to the outer wall of the snap-fit ​​ring (30), and an extrusion groove (29) corresponding to the position of the sealing ring (26) is provided on the surface of the fixed block (8).

5. The tail gas exhaust assembly for a gas chromatograph according to claim 4, characterized in that: A plurality of positioning plates (28) are fixedly connected to the inner wall of the adsorption tube (2), and the outer wall of the positioning plate (28) is in contact with the outer wall of the adsorption bottle (6).

6. The tail gas exhaust assembly for a gas chromatograph according to claim 5, characterized in that: The adsorption bottle (6) comprises a placement tube (61) and a connecting sleeve (62), wherein the inner wall at the bottom of the connecting sleeve (62) and the outer wall at the top of the placement tube (61) are threadedly connected, the fixing block (8) is fixedly connected to the top of the connecting sleeve (62), and the connecting block (9) is fixedly connected to the bottom of the placement tube (61).

7. The tail gas exhaust assembly for a gas chromatograph according to claim 6, characterized in that: One end of the insertion rod (18) away from the moving block (17) is fixedly connected to a silicone pad (20), and the silicone pad (20) is respectively fitted with the outer walls of the flow limiting ball (11) and the flow stopping ball (14).

8. The tail gas exhaust assembly for a gas chromatograph according to claim 7, characterized in that: A plurality of anti-slip strips (27) are fixedly connected to the outer wall of the top cover (3).

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