A tail gas detection device

Abstract

The application discloses a tail gas detection device, which comprises a detection pipeline, a tail gas detector, a filter screen, two groups of impellers and brushes. The filter screen is coaxially installed in the detection pipeline, the detection probe rod of the tail gas detector is located between the filter screen and the outlet end of the detection pipeline, the two groups of impellers are respectively arranged on the two sides of the filter screen, the impellers are coaxially arranged with the filter screen, the end of the rotating shaft of the impeller is fixed with a brush, and the two brushes abut against the two sides of the filter screen. The filter screen is arranged to filter the tail gas in the detection pipeline, the tail gas can be filtered before contacting the detection probe rod, the tail gas detector is protected, the brushes are arranged to clean the filter screen, the detection pipeline can be kept unobstructed, the impellers drive the brushes to rotate to clean the filter screen, the impellers are driven by the airflow of the tail gas, the structure is simple, and energy can be effectively saved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of tail gas detection, and specifically relates to a tail gas detection device. BACKGROUND

[0002] In the field of chemical production, a lot of tail gas (also called waste gas) is often generated, and if the tail gas is directly discharged into the external environment, it will cause serious pollution to the external environment. With the increasingly high requirement for environmental protection, the existing chemical plants generally discharge the tail gas into the external environment after treatment, and therefore, a tail gas detection device is needed to detect the tail gas at the tail gas discharge end to determine whether the tail gas meets the discharge standard.

[0003] A related document discloses a gas detector for gas extraction pipeline and a gas detection probe thereof. Specifically, the detector comprises: a hollow rod body, which is internally provided with an air inlet pipe and an air outlet pipe; a mounting shell, which is connected to one end of the hollow rod body away from the insertion section, and internally provided with a detection chamber, and an inner cavity of the detection chamber constitutes a detection cavity; a gas detection sensor, which is partially located in the detection cavity to detect the gas parameters in the detection cavity; the air inlet pipe and the air outlet pipe are respectively communicated with the detection cavity to form a detection path for the gas to enter from the air inlet, pass through the detection cavity and be discharged from the air outlet; and a meter head, which is used for signals detected by various sensors mounted on the hollow probe.

[0004] Although the gas detector can also detect the gas in real time, the waste gas is not filtered before detection, and in long-term use, the dust and other large particles in the waste gas may block the air inlet of the detection probe, affecting the use. SUMMARY

[0005] The purpose of the present application is to provide a tail gas detection device to solve at least one of the above technical problems.

[0006] To achieve the above purpose, the technical solution adopted by the present application is:

[0007] A tail gas detection device, comprising:

[0008] A detection pipeline, which is connected to the discharge port of the tail gas through the detection pipeline to introduce the tail gas into the detection pipeline, and can also be used for tail gas discharge through the detection pipeline;

[0009] A tail gas detector, wherein a detection probe of the tail gas detector is located in the detection pipeline;

[0010] A filter screen, which is coaxially installed in the detection pipeline, and the detection probe is located between the filter screen and the outlet end of the detection pipeline;

[0011] Two groups of impellers are arranged on both sides of the filter screen, the impellers are coaxially arranged with the filter screen, and the ends of the rotating shafts of the impellers are fixed with brushes, and a pair of the brushes abut against both sides of the filter screen.

[0012] The filter screen is arranged to filter the tail gas in the pipeline, so that the tail gas is filtered before contacting the detection probe, and the tail gas detector is protected, and the brushes are arranged to clean the filter screen, so that the detection pipeline is kept unobstructed, wherein the brushes are driven to rotate by the impellers, the impellers are driven by the airflow of the tail gas, the structure is simple, and energy can be effectively saved.

[0013] Further, a dust collecting box with an open top surface is arranged below the brushes, for collecting dust swept by the brushes, the dust collecting box is sealed through the wall of the detection pipeline and extends out of the detection pipeline.

[0014] Further, a dust cleaning port is arranged at the bottom of the dust collecting box, and a cover is detachably connected to the dust cleaning port, the dust cleaning port is arranged to clean the dust and other large particles collected in the dust collecting box, and the threaded cover facilitates opening and closing of the dust cleaning port.

[0015] Further, a first branch and a second branch are further included, the inlet end and the outlet end of the first branch are in communication with the detection pipeline, the inlet end and the outlet end of the second branch are in communication with the detection pipeline, the inlet end of the first branch, the inlet end of the second branch, the filter screen, the outlet end of the first branch, the outlet end of the second branch and the detection probe are sequentially arranged along the direction from the inlet end of the detection pipeline to the outlet end of the detection pipeline; the detection pipeline, the first branch and the second branch are square pipelines; first and second valve plates are rotatably arranged in the detection pipeline; the detection pipeline is arranged as a square pipeline, which is conducive to rotation of the first and second valve plates in the detection pipeline; the first valve plate is located between the inlet end of the first branch and the inlet end of the second branch, and the first valve plate is rotatable to seal and block the inlet end of the first branch or the detection pipeline; the second valve plate is located between the outlet end of the first branch and the outlet end of the second branch, and the second valve plate is rotatable to seal and block the outlet end of the second branch or the detection pipeline.

[0016] When the first valve plate seals the inlet end of the first branch, and the second valve plate seals the outlet end of the second branch, the tail gas passes through the filter screen from the side of the filter screen close to the inlet end of the detection pipeline; when the first valve plate seals the detection pipeline, and the second valve plate also seals the detection pipeline, the tail gas passes through the filter screen from the side of the filter screen close to the outlet end of the detection pipeline through the first branch, and is discharged through the second branch. By arranging the first branch and the second branch, the path of the tail gas flow can be changed by cooperating the first valve plate and the second valve plate. When the filter screen is used for a long time, some dust will be stuck in the filter screen because the tail gas passes through the filter screen from one direction. By changing the direction of the tail gas flow, the dust stuck in the filter screen can be blown down by using the backflushing of the tail gas, so that the clogging of the filter screen is improved.

[0017] Further, four sealing rings are further included, two of which are arranged in the detection pipeline, and the other two are arranged at the inlet end of the first branch and the outlet end of the second branch respectively; the two sealing rings arranged in the detection pipeline are arranged between the inlet end of the first branch and the inlet end of the second branch, and between the outlet end of the first branch and the outlet end of the second branch respectively, and the first valve plate and the second valve plate cooperate with the corresponding sealing rings respectively; by arranging the sealing rings, the sealing performance of the corresponding sealing rings can be enhanced; specifically, the first valve plate can cooperate with the two adjacent sealing rings, the connection between the inlet end of the first branch and the detection pipeline is located on the side wall of the detection pipeline, when the first valve plate is rotated to be parallel to the side wall of the detection pipeline, the first valve plate can cover the sealing ring arranged at the inlet end of the first branch to seal the inlet end of the first branch, and the sealing ring can increase the sealing performance of the sealing; when the first valve plate is rotated to be parallel to the cross section of the detection pipeline, the first valve plate can cover the sealing ring arranged between the inlet end of the first branch and the inlet end of the second branch to seal the detection pipeline, and the sealing ring can increase the sealing performance of the sealing; the second valve plate can cooperate with the two adjacent sealing rings, the connection between the outlet end of the second branch and the detection pipeline is located on the side wall of the detection pipeline, when the second valve plate is rotated to be parallel to the side wall of the detection pipeline, the second valve plate can cover the sealing ring arranged at the outlet end of the second branch to seal the outlet end of the second branch, and the sealing ring can increase the sealing performance of the sealing; when the second valve plate is rotated to be parallel to the cross section of the detection pipeline, the second valve plate can cover the sealing ring arranged between the outlet end of the first branch and the outlet end of the second branch to seal the detection pipeline, and the sealing ring can increase the sealing performance of the sealing; the outer peripheral wall of the sealing ring is sealingly fixed with the detection pipeline, the first branch and the second branch.

[0018] Further, both surfaces of the first valve plate and the second valve plate are provided with sealing gaskets, and end surfaces of the sealing ring are provided with sealing washers matched with the sealing gaskets, so that the sealing between the first valve plate, the second valve plate and the sealing ring is enhanced by matching the sealing gaskets and the sealing washers.

[0019] Further, the first valve plate and the second valve plate are provided with magnetic blocks, and the sealing ring is provided with magnetic rings matched with the magnetic blocks, so that the first valve plate and the second valve plate are attracted when they are close to the sealing ring, thereby facilitating the sealing state.

[0020] Further, the sealing ring is coaxially and fixedly provided with a blocking ring at one end away from the sealing gasket, and a buffer ring is coaxially and slidingly connected in the sealing ring, and a buffer spring is coaxially arranged between the blocking ring and the buffer ring, one end of the buffer spring is in abutment with the blocking ring, and the other end is in abutment with the buffer ring, and one end of the buffer ring protruding towards the sealing gasket forms a buffer part with a hole in the middle, the blocking ring is used to install the buffer ring and the buffer spring in the sealing ring, and the buffer ring matched with the buffer spring can provide buffer when the first valve plate and the second valve plate are close to the sealing ring, thereby reducing the impact force of the first valve plate and the second valve plate on the buffer ring.

[0021] Further, the rotating shafts of the first valve plate and the second valve plate are sealingly and penetratingly arranged outside the detection pipeline, and one end of the rotating shafts of the first valve plate and the second valve plate outside the detection pipeline is fixedly connected with a first connecting rod, the first connecting rod is rotationally connected with a second connecting rod, the second connecting rod is rotationally connected with a rack, and the two racks are arranged in parallel and slidingly installed on the outer wall of the detection pipeline, and the rack slides to drive the first connecting rod to rotate; a driving motor is installed between the two racks, and a gear is arranged at the end of the output shaft of the driving motor, and the gear is engaged with the two racks, so that the driving motor can drive the two racks to slide at the same time, thereby simultaneously driving the first valve plate and the second valve plate to rotate, so that the tail gas enters from the inlet end of the detection pipeline, does not pass through the first branch and the second branch, directly passes through the filter screen, and then exits from the outlet end of the detection pipeline; the first valve plate and the second valve plate can also be controlled to seal the detection pipeline at the same time, so that the tail gas enters from the inlet end of the detection pipeline, passes through the first branch to the side of the filter screen close to the outlet end of the first branch, passes through the filter screen again, passes through the second branch, and finally exits from the detection pipeline.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] This invention uses a filter screen to filter the exhaust gas in the detection pipeline, filtering the exhaust gas before it comes into contact with the detection probe, thus protecting the exhaust gas detector. It also includes a brush for cleaning the filter screen, ensuring the unobstructed flow of the detection pipeline. The brush is driven by an impeller to clean the filter screen, and the impeller is driven by the airflow of the exhaust gas. The invention has a simple structure and effectively saves energy. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an exhaust gas detection device in this embodiment;

[0025] Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle;

[0026] Figure 3 This is a front view of an exhaust gas detection device in this embodiment;

[0027] In the diagram: 1. Detection pipeline; 101. Inlet end of detection pipeline; 102. Outlet end of detection pipeline; 2. Exhaust gas detector; 201. Detector body; 202. Detection probe; 3. Filter screen; 4. Impeller; 5. Brush; 6. Ash collection box; 7. Cover; 8. First branch; 801. Inlet end of first branch; 802. Outlet end of first branch; 9. Second branch; 901. Inlet end of second branch; 902. Outlet end of second branch; 10. First valve plate; 11. Second valve plate; 12. Sealing ring; 13. Sealing gasket; 14. Sealing washer; 15. Magnetic block; 16. Magnetic ring; 17. Retaining ring; 18. Buffer ring; 19. Buffer spring; 20. Buffer section; 21. First connecting rod; 22. Second connecting rod; 23. Rack; 24. Drive motor. Detailed Implementation

[0028] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figures 1-3 As shown, this embodiment provides an exhaust gas detection device, including:

[0030] Detection pipe 1; The detection pipe 1 is connected to the exhaust port to introduce exhaust gas into the detection pipe 1, and the detection pipe 1 can also be used for exhaust gas emission.

[0031] A tail gas detector 2, a detection probe 202 of the tail gas detector 2 is located in the detection pipeline 1; preferably, the tail gas detector 2 comprises a detector body 201 and a detection probe 202 connected with the detector body 201; the detector body 201 is installed outside the detection pipeline 1, and the detection probe 202 is sealed through the detection pipeline 1 and extends to the inside of the detection pipeline 1; the tail gas detector 2 is used for tail gas detection, and different tail gas detectors 2 can be set according to different detection types, for example, the tail gas detector 2 can be a carbon monoxide detector, a hydrogen sulfide detector, an ammonia detector or a sulfur dioxide detector, or a composite gas detector that can detect multiple types of gas at the same time; optionally, the tail gas detector 2 can also be entirely arranged in the detection pipeline 1;

[0032] A filter screen 3 is coaxially installed in the detection pipeline 1, and the detection probe 202 is located between the filter screen 3 and the outlet end 102 of the detection pipeline;

[0033] Two groups of impellers 4 are respectively arranged on both sides of the filter screen 3, the impellers 4 are coaxially arranged with the filter screen 3, the ends of the rotating shafts of the impellers 4 are fixed with brushes 5, and one pair of the brushes 5 abut against both sides of the filter screen 3.

[0034] The filter screen 3 is arranged to filter the tail gas in the detection pipeline 1, the tail gas can be filtered before contacting the detection probe 202, and the tail gas detector 2 is protected, the brushes 5 are arranged to clean the filter screen 3, the detection pipeline 1 can be kept unobstructed, the impellers 4 drive the brushes 5 to rotate to clean the filter screen 3, the impellers 4 are driven by the airflow of the tail gas, the structure is simple, and energy can be effectively saved.

[0035] Further, a dust collecting box 6 with an open top surface is arranged below the brush 5 and is used for collecting dust swept by the brush 5, the dust collecting box 6 is sealed through the wall of the detection pipeline 1 and extends to the outside of the detection pipeline 1.

[0036] Further, a dust collecting box 6 with an open top surface is arranged below the brush 5 and is used for collecting dust swept by the brush 5, the dust collecting box 6 is sealed through the wall of the detection pipeline 1 and extends to the outside of the detection pipeline 1.

[0037] Further, the first branch 8 and the second branch 9 are further included, the inlet end 801 and the outlet end of the first branch are in communication with the detection pipeline 1, the inlet end 901 and the outlet end of the second branch are in communication with the detection pipeline 1, the inlet end 801 of the first branch, the inlet end 901 of the second branch, the filter screen 3, the outlet end 802 of the first branch, the outlet end 902 of the second branch and the detection probe 202 are sequentially arranged along the direction from the inlet end 101 of the detection pipeline to the outlet end 102 of the detection pipeline; the detection pipeline 1, the first branch 8 and the second branch 9 are all square pipelines; the first valve plate 10 and the second valve plate 11 are rotatably arranged in the detection pipeline 1, by arranging the detection pipeline 1 as a square pipeline, the first valve plate 10 and the second valve plate 11 are facilitated to rotate in the detection pipeline 1; the first valve plate 10 is located between the inlet end 801 of the first branch and the inlet end 901 of the second branch, the first valve plate 10 rotates to seal and block the inlet end 801 of the first branch or the detection pipeline 1; the second valve plate 11 is located between the outlet end 802 of the first branch and the outlet end 902 of the second branch, the second valve plate 11 rotates to seal and block the outlet end 902 of the second branch or the detection pipeline 1;

[0038] When the first valve plate 10 blocks the inlet end 801 of the first branch and the second valve plate 11 blocks the outlet end 902 of the second branch, the exhaust gas passes through the filter screen 3 from the side of the filter screen 3 close to the inlet end of the detection pipeline 1; when the first valve plate 10 blocks the detection pipeline 1 and the second valve plate 11 also blocks the detection pipeline 1, the exhaust gas passes through the filter screen 3 from the side of the filter screen 3 close to the outlet end of the detection pipeline 1 through the first branch 8, and is discharged through the second branch 9, by arranging the first branch 8 and the second branch 9, cooperating with the first valve plate 10 and the second valve plate 11, the path of the exhaust gas flow can be changed, when the filter screen 3 is used for a long time, some dust will be stuck in the filter screen 3 because the exhaust gas passes through the filter screen 3 from one direction, by changing the direction of the exhaust gas flow, the dust stuck in the filter screen 3 can be blown down by using the exhaust gas to blow the filter screen 3, and the situation of the filter screen 3 being blocked is improved.

[0039] Further, four sealing rings 12 are further included, two of which are arranged in the detection pipeline 1, and the other two are arranged at the inlet end 801 of the first branch and the outlet end 902 of the second branch respectively; the two sealing rings 12 arranged in the detection pipeline 1 are arranged between the inlet end 801 of the first branch and the inlet end 901 of the second branch and between the outlet end 802 of the first branch and the outlet end 902 of the second branch respectively, and the first valve plate 10 and the second valve plate 11 are matched with the corresponding sealing rings 12 respectively; by arranging the sealing rings 12, the sealing performance of the corresponding sealing rings 12 can be enhanced; specifically, the first valve plate 10 can be matched with the two adjacent sealing rings 12, the connection between the inlet end 801 of the first branch and the detection pipeline 1 is located on the side wall of the detection pipeline 1, when the first valve plate 10 is rotated to be parallel to the side wall of the detection pipeline 1, the first valve plate 10 can cover the sealing ring 12 arranged at the inlet end of the first branch 8 to block the inlet end 801 of the first branch, and the sealing ring 12 can increase the sealing performance of the blocking; when the first valve plate 10 is rotated to be parallel to the cross section of the detection pipeline 1, the first valve plate 10 can cover the sealing ring 12 arranged between the inlet end of the first branch 8 and the inlet end of the second branch 9 to block the detection pipeline 1, and the sealing ring 12 can increase the sealing performance of the blocking; the second valve plate 11 can be matched with the two adjacent sealing rings 12, the connection between the outlet end 902 of the second branch and the detection pipeline 1 is located on the side wall of the detection pipeline 1, when the second valve plate 11 is rotated to be parallel to the side wall of the detection pipeline 1, the second valve plate 11 can cover the sealing ring 12 arranged at the outlet end of the second branch 9 to block the outlet end 902 of the second branch, and the sealing ring 12 can increase the sealing performance of the blocking; when the second valve plate 11 is rotated to be parallel to the cross section of the detection pipeline 1, the second valve plate 11 can cover the sealing ring 12 arranged between the outlet end of the first branch 8 and the outlet end of the second branch 9 to block the detection pipeline 1, and the sealing ring 12 can increase the sealing performance of the blocking; the outer peripheral wall of the sealing ring 12 is sealingly fixed with the detection pipeline 1, the first branch 8 and the second branch 9.

[0040] Further, the two surfaces of the first valve plate 10 and the second valve plate 11 are provided with sealing gaskets 13, and the end surface of the sealing ring 12 is provided with a sealing washer 14 matched with the sealing gasket 13, and the sealing performance between the first valve plate 10 and the second valve plate 11 and the sealing ring 12 is enhanced by matching the sealing gasket 13 and the sealing washer 14.

[0041] Further, the first valve plate 10 and the second valve plate 11 are provided with a magnetic block 15, the sealing ring 12 is provided with a magnetic ring 16 matched with the magnetic block 15, the magnetic block 15 and the magnetic ring 16 are attracted to each other, so that the first valve plate 10 and the second valve plate 11 are attracted when they are close to the sealing ring 12, thereby facilitating the sealing state.

[0042] Further, the sealing ring 12 is coaxially provided with a blocking ring 17 at one end away from the sealing gasket 13, the sealing ring 12 is coaxially connected with a buffer ring 18, the blocking ring 17 and the buffer ring 18 are coaxially provided with a buffer spring 19, one end of the buffer spring 19 abuts against the blocking ring 17, and the other end abuts against the buffer ring 18, the buffer ring 18 protrudes at one end towards the sealing gasket 13 to form a buffer part 20 with a hole in the middle, the blocking ring 17 is provided for installing the buffer ring 18 and the buffer spring 19 in the sealing ring 12, and the buffer ring 18 cooperates with the buffer spring 19 to provide a buffer when the first valve plate 10 and the second valve plate 11 are close to the sealing ring 12, thereby reducing the impact force of the first valve plate 10 and the second valve plate 11 on the buffer ring 18.

[0043] Further, the rotating shafts of the first valve plate 10 and the second valve plate 11 are sealed and arranged outside the detection pipeline 1, and the rotating shafts of the first valve plate 10 and the second valve plate 11 are fixedly connected with a first connecting rod 21 at one end outside the detection pipeline 1, the first connecting rod 21 is rotatably connected with a second connecting rod 22, the second connecting rod 22 is rotatably connected with a rack 23, and the two racks 23 are arranged in parallel and slidably installed on the outer wall of the detection pipeline 1, and the rack 23 slides to drive the first connecting rod 21 to rotate; a driving motor 24 is installed between the two racks 23, and the output shaft of the driving motor 24 is provided with a gear, and the gear is engaged with the two racks 23, so that the driving motor 24 can drive the two racks 23 to slide at the same time, thereby driving the first valve plate 10 and the second valve plate 11 to rotate at the same time, so that the first valve plate 10 can block the inlet end 801 of the first branch at the same time, and the second valve plate 11 can block the outlet end 902 of the second branch, so that the exhaust gas enters the detection pipeline from the inlet end 101, does not pass through the first branch 8 and the second branch 9, directly passes through the filter screen 3, and then exits from the outlet end 102 of the detection pipeline; the first valve plate 10 and the second valve plate 11 can also be controlled to block the detection pipeline 1 at the same time, so that the exhaust gas enters the detection pipeline from the inlet end 101, passes through the first branch 8 to the side of the filter screen 3 close to the outlet end of the first branch 8, then passes through the filter screen 3, passes through the second branch 9, and finally exits from the detection pipeline 1.

[0044] It should be noted that although the present application is disclosed with specific embodiments as above, the above embodiments are not intended to limit the present application, and those of ordinary skill in the art can make various changes and modifications without departing from the spirit and scope of the present application, and therefore the protection scope of the present application is defined by the scope of claims.

Claims

1. A tail gas detection device, characterized by, The utility model relates to a tail gas detection device, which comprises: a detection pipeline; a tail gas detector, the detection probe of which is located in the detection pipeline; a filter screen coaxially installed in the detection pipeline, the detection probe being located between the filter screen and the outlet end of the detection pipeline; two groups of impellers respectively arranged on both sides of the filter screen, the impellers being coaxially arranged with the filter screen, the ends of the rotating shafts of the impellers being fixed with brushes, and a pair of the brushes abutting against both sides of the filter screen; further comprising a first branch and a second branch, the inlet end and the outlet end of the first branch being in communication with the detection pipeline, the inlet end and the outlet end of the second branch being in communication with the detection pipeline, the inlet end of the first branch, the inlet end of the second branch, the filter screen, the outlet end of the first branch, the outlet end of the second branch and the detection probe being sequentially arranged along the direction from the inlet end of the detection pipeline to the outlet end of the detection pipeline; the detection pipeline, the first branch and the second branch are all square pipelines; the first valve plate and the second valve plate are rotatably arranged in the detection pipeline; the first valve plate is located between the inlet end of the first branch and the inlet end of the second branch, and the first valve plate is rotatable to seal and block the inlet end of the first branch or the detection pipeline; the second valve plate is located between the outlet end of the first branch and the outlet end of the second branch, and the second valve plate is rotatable to seal and block the outlet end of the second branch or the detection pipeline; when the first valve plate blocks the inlet end of the first branch and the second valve plate blocks the outlet end of the second branch, the tail gas passes through the filter screen from the side of the filter screen close to the inlet end of the detection pipeline; when the first valve plate blocks the detection pipeline and the second valve plate also blocks the detection pipeline, the tail gas passes through the filter screen from the side of the filter screen close to the outlet end of the detection pipeline and is discharged through the second branch.

2. The tail gas detection apparatus according to claim 1, characterized by a dust collecting box with an open top surface is arranged below the brushes, for collecting the dust swept by the brushes, the dust collecting box is sealed through the wall of the detection pipeline and extends out of the detection pipeline.

3. The tail gas detection apparatus according to claim 2, characterized by a dust cleaning port is formed in the bottom of the dust collecting box, and a cover is detachably connected to the dust cleaning port.

4. The tail gas detection apparatus according to claim 1, characterized by further comprising four sealing rings, two of which are arranged in the detection pipeline, and the other two are arranged at the inlet end of the first branch and the outlet end of the second branch respectively; the two sealing rings arranged in the detection pipeline are arranged between the inlet end of the first branch and the inlet end of the second branch and between the outlet end of the first branch and the outlet end of the second branch respectively, and the first valve plate and the second valve plate are matched with the corresponding sealing rings respectively.

5. The tail gas detection apparatus according to claim 4, characterized by the two surfaces of the first valve plate and the second valve plate are provided with sealing gaskets, and the end surface of the sealing ring is provided with a sealing ring matched with the sealing gasket.

6. The tail gas detection apparatus according to claim 4, wherein magnetic blocks are arranged in the first valve plate and the second valve plate, and magnetic rings matched with the magnetic blocks are arranged in the sealing ring.

7. The tail gas detection apparatus according to claim 5, wherein The sealing ring is coaxially and fixedly provided with a stop ring at one end away from the sealing gasket, a buffer ring is coaxially and slidingly connected in the sealing ring, a buffer spring is coaxially arranged between the stop ring and the buffer ring, one end of the buffer spring is in abutment with the stop ring, and the other end is in abutment with the buffer ring, and the buffer ring protrudes at one end towards the sealing gasket to form a buffer portion with a hole in the middle.

8. The tail gas detection apparatus of claim 1, wherein The rotating shafts of the first valve plate and the second valve plate are both sealed and arranged outside the detection pipeline, and one end of the rotating shafts of the first valve plate and the second valve plate outside the detection pipeline is fixedly connected with a first connecting rod, the first connecting rod is rotatably connected with a second connecting rod, the second connecting rod is rotatably connected with a rack, the two racks are arranged in parallel and slidingly installed on the outer wall of the detection pipeline, and the rack slides to drive the first connecting rod to rotate; a driving motor is installed between the two racks, the output shaft of the driving motor is provided with a gear at the end, and the gear is meshed with the two racks.

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