A harmful gas detecting device

Abstract

The application discloses a harmful gas detection device and belongs to the technical field of environmental monitoring. The device is provided with an intercepting mechanism, which simultaneously rotates to close the valve cores on both sides of the selected sampling pipeline to intercept the gas in the sampling pipeline. After the gas is intercepted, the gas stops flowing, a relatively stable gas sample space is formed, the stratification problem of components in dynamic flow is avoided, and the sample is more uniform. The method is suitable for scenes where the gas flow speed is fast, the concentration changes fast, stable samples need to be quickly intercepted to capture the instantaneous state, the valve core on the gas outlet side of the selected sampling pipeline is closed, and after it is confirmed that the gas in the sampling pipeline is full and stable, the valve core on the gas inlet side of the selected sampling pipeline is closed. At this time, the sample drawn from the sampling pipeline is suitable for scenes where the gas flow speed is low, the edge effect is significant, the precision detection demand is high, and the overall composition and concentration need to be fully reflected.

Description

Technical Field

[0001] This invention relates to the field of electrical cable manufacturing technology, and in particular to a hazardous gas detection device. Background Technology

[0002] As a safety device for real-time monitoring of the concentration of specific toxic and harmful gases in the environment, the toxic and harmful gas detector is widely used in petrochemical, metallurgical, environmental protection, public safety and home environments. Its core function is to detect gas concentration through electrochemical sensors and generate a current signal proportional to the gas concentration by utilizing the oxidation-reduction characteristics of the gas in chemical reactions. It is small in size and easy to hand or carry, and is suitable for mobile inspections, confined space operations and other scenarios. It can also be fixedly installed on site for continuous monitoring to meet the long-term monitoring needs of industrial environments.

[0003] In actual testing, gas needs to be drawn into the pipeline set by the detector. However, when the gas flows, there is a concentration gradient at different locations in the pipeline due to differences in flow rate, temperature, pressure or chemical reaction. For example, the gas near the pipe wall may have a reduced flow rate due to friction or condensation due to temperature changes, resulting in a different concentration of pollutants than the center of the pipeline. Traditional sampling methods involve inserting the sampling tube into the pipeline through the sampling port or the side wall of the flue, ensuring that the tube port faces the airflow direction and adjusting the insertion depth to 1 / 3 to 2 / 3 of the pipe diameter to avoid the edge vortex zone.

[0004] However, in actual use, since traditional sampling is still carried out directly on the ventilation duct, it can only reduce edge effect interference when the flow velocity in the duct cannot be guaranteed to be stable. Under the influence of factors such as unreasonable duct design, when the gas flow velocity distribution is relatively uneven, it is still easy to cause local component stratification of the gas, such as heavy gas approaching the duct wall and light gas gathering towards the center, which affects the representativeness of the sample and ultimately reduces the accuracy of the test results. Summary of the Invention

[0005] The purpose of this invention is to address the problem that traditional sampling is still carried out directly on ventilation ducts. Therefore, when the flow velocity within the duct cannot be guaranteed to be stable, it can only reduce edge effect interference. Under the influence of factors such as unreasonable duct design, the gas flow velocity distribution is relatively uneven, which can still easily lead to local component stratification of gas, affecting the representativeness of the sample and reducing the accuracy of the detection results. Therefore, a harmful gas detection device is proposed.

[0006] To achieve the above objectives, the present invention employs the following technology in a hazardous gas detection device:

[0007] The device includes a detection equipment body, which includes a detector and multiple sampling pipes installed on the detector. Each sampling pipe has an air inlet and an exhaust outlet installed at both ends. Gas in the ventilation duct enters the sampling pipe through the air inlet and re-enters the ventilation duct through the exhaust outlet. The gas flowing through the sampling pipe is introduced into the detector through the first air guide tube. The multiple sampling pipes are connected to each other through a cutting mechanism.

[0008] The interception mechanism includes a valve body disposed between two adjacent sampling pipes. The valve body is connected to the sampling pipes through connecting pipes at both ends. A valve core is disposed in the middle of the valve body to block the flow of gas. At the same time, the valve cores located on both sides of the selected sampling pipe are rotated to close, so as to intercept the gas in the section of the sampling pipe. An air inlet chamber is installed through an air guide hole on the surface of the connecting pipe. The air inlet chamber is connected to the sampling pipe through a hole at the end. A sealing member with a sealing hole is disposed in the air inlet chamber through a rotating mechanism.

[0009] The air intake chamber is connected to a second air guide tube via a sampling mechanism. The sampling mechanism includes a sampling tube inserted into the air intake chamber, and the sampling tube is connected to the first air guide tube via the second air guide tube.

[0010] Further description of a hazardous gas detection device based on the above-mentioned technology:

[0011] The rotating mechanism includes a positioning shaft fixedly installed in the middle of the air intake chamber and a kit rotatably embedded in the positioning shaft. The outer wall of the kit is connected to the sealing component and a rotating rod that passes through the positioning shaft is provided in the middle. The sampling tube is driven to rotate by a time-delay sealing mechanism provided on the rotating rod.

[0012] A torsion spring is wound around the surface of the rotating rod, and both ends of the torsion spring are connected to the inner wall of the positioning shaft. When the closure rotates, the torsion spring is tightened by the rotating rod to store force.

[0013] Further description of a hazardous gas detection device based on the above-mentioned technology:

[0014] The time-delay sealing mechanism includes a guide shaft mounted on a rotating rod. The guide shaft includes a shaft body connected to the rotating rod. An inclined groove is formed on the surface of the shaft body. A collar is slidably fitted on the surface of the shaft body. A guide member that cooperates with the inclined groove is provided on the inner wall of the collar.

[0015] Further description of a hazardous gas detection device based on the above-mentioned technology:

[0016] The delayed sealing mechanism also includes at least one through hole opened on the collar, through which the gas entering the intake chamber passes through the collar;

[0017] Additionally, a lifting ring is provided at the air intake outlet and fixedly connected to the shaft body. The lifting ring is provided with several interlocking strips that block the through holes, and the collar is provided with protrusions for blocking the gaps between adjacent interlocking strips.

[0018] Further description of a hazardous gas detection device based on the above-mentioned technology:

[0019] The surface of the shaft is also provided with a straight groove that communicates with the inclined groove;

[0020] The shaft pushes the collar upward through the cooperation of the inclined groove and the guide, while the sealing member rotates and closes first, preventing gas from entering the intake chamber. After the guide slides from the inclined groove into the straight groove, the through hole and the fitting strip are engaged and closed, so that the through hole closes delayed after the sealing member closes, allowing time for the gas in the intake chamber to be emptied.

[0021] Further description of a hazardous gas detection device based on the above-mentioned technology:

[0022] The sampling mechanism also includes several slots at the end of the sampling tube, and several locking blocks that cooperate with the slots are installed on the collar via an abutment ring set on the outer edge. After the slots and locking blocks are engaged, the rotation of the abutment ring is restricted.

[0023] Further description of a hazardous gas detection device based on the above-mentioned technology:

[0024] The sampling tube is slidably disposed in the adjustment mechanism. The adjustment mechanism includes a shell sleeved on the surface of the sampling tube, and a rotating component is rotatably embedded in the shell. At least one sliding groove is opened on the surface of the shell, and an arc-shaped groove corresponding to the position of the sliding groove is opened on the surface of the rotating component.

[0025] The sampling tube is equipped with a guide rod via a fitting ring, and a slider is installed at the end of the guide rod. The slider is slidably embedded in the groove, and the guide rod passes through the middle of the arc-shaped groove.

[0026] Further description of a hazardous gas detection device based on the above-mentioned technology:

[0027] The rotating component has several curved holes on its surface for the second air guide tube to pass through.

[0028] Further description of a hazardous gas detection device based on the above-mentioned technology:

[0029] The housing and the rotating component are respectively provided with a first opening and a second opening that cooperate with the valve core.

[0030] Further description of a hazardous gas detection device based on the above-mentioned technology:

[0031] The housing is slidably mounted on the surface of the sampling pipe via a sliding mechanism. The sliding mechanism includes at least two mounting brackets mounted on the housing, and sleeves are mounted on the mounting brackets.

[0032] Additionally, support frames are installed at both ends of the sampling pipe, and sliding cables that pass through the sleeve are installed on the support frames.

[0033] One of the above technical solutions has the following advantages or beneficial effects:

[0034] 1. By using a set interception mechanism, the valve cores located on both sides of the selected sampling pipe are simultaneously rotated and closed to intercept the gas in that section of the sampling pipe. After interception, the gas stops flowing, forming a relatively stable gas sample space, avoiding the problem of component stratification in dynamic flow, and the sample is more uniform. This method is suitable for scenarios with fast gas flow rate and rapid concentration change, where it is necessary to quickly intercept stable samples to capture instantaneous states. After closing the valve core on the gas outlet side of the selected sampling pipe and confirming that the gas in the sampling pipe is full and stable, the valve core on the gas inlet side of the selected sampling pipe is closed. The sample extracted from the sampling pipe at this time is suitable for scenarios with low gas flow rate, significant edge effect, high precision detection requirements, and the need to comprehensively reflect the overall composition and concentration.

[0035] 2. Through the set rotation mechanism and delayed sealing mechanism, when the gas sampling is completed and the sampling tube is pulled out, the sealing part drives the shaft to reverse under the drive of the torsion spring. The shaft pushes the collar to rise through the cooperation of the inclined groove and the guide part. At the same time, the sealing part rotates and closes first, preventing gas from entering the air inlet chamber. After the guide part slides from the inclined groove into the straight groove, the through hole and the fitting strip are engaged and closed, so that the through hole closes delayed after the sealing part closes, reserving time for the gas in the air inlet chamber to be emptied, thereby achieving the purpose of avoiding sample contamination caused by residual gas. Attached Figure Description

[0036] Figure 1 A three-dimensional structural schematic diagram of a hazardous gas detection device is shown;

[0037] Figure 2 A partial three-dimensional structural schematic diagram of the interception mechanism is shown;

[0038] Figure 3 A three-dimensional cross-sectional view of the structure is shown when the valve core is open and the air intake chamber is closed.

[0039] Figure 4 A three-dimensional cross-sectional view of the structure is shown when the valve core is closed and the air intake chamber is open.

[0040] Figure 5 This diagram shows a three-dimensional cross-sectional view of the intake chamber when it is closed by the sealing element.

[0041] Figure 6 A three-dimensional cross-sectional view of the air intake chamber is shown when the closure is open;

[0042] Figure 7 It shows Figure 6 Enlarged structural diagram at point A;

[0043] Figure 8A three-dimensional structural diagram of the delayed sealing mechanism in its closed state is shown;

[0044] Figure 9 A three-dimensional structural schematic diagram of the delayed sealing mechanism in the open state is shown;

[0045] Figure 10 A partial three-dimensional structural schematic diagram of the collar and guide component is shown;

[0046] Figure 11 A three-dimensional structural diagram of the guide shaft and rotating rod is shown;

[0047] Figure 12 A partial three-dimensional structural schematic diagram of the sampling mechanism is shown;

[0048] Figure 13 A three-dimensional cross-sectional structural diagram of the closure being opened via a sampling mechanism is shown.

[0049] Figure 14 This diagram shows a three-dimensional structure of the sampling tube when it is retracted via the adjustment mechanism.

[0050] Figure 15 This diagram shows a three-dimensional structure of the sampling tube as it is moved out by the adjustment mechanism.

[0051] Figure 16 A three-dimensional cross-sectional structural diagram of the adjustment mechanism is shown;

[0052] Figure 17 A partial three-dimensional structural schematic diagram of the housing and sliding mechanism is shown;

[0053] Figure 18 A three-dimensional structural schematic diagram of the rotating component is shown;

[0054] Figure 19 A partial three-dimensional cross-sectional structural diagram of the guide rod and slider is shown.

[0055] Legend:

[0056] 10. Detection equipment body; 11. Detector; 12. Sampling pipe; 13. Air inlet; 14. First air guide pipe; 15. Exhaust port;

[0057] 20. Cut-off mechanism; 21. Valve body; 22. Valve core; 23. Connecting pipe; 24. Air guide hole; 25. Air inlet chamber; 26. Sealing component; 27. Second air guide pipe;

[0058] 30. Rotating mechanism; 31. Positioning shaft; 32. Kit; 33. Rotating rod; 34. Torsion spring;

[0059] 40. Delayed sealing mechanism; 41. Guide shaft; 411. Shaft body; 412. Straight groove; 413. Inclined groove; 42. Collar; 43. Guide component; 44. Through hole; 45. Lifting ring; 46. Fitting strip; 47. Protrusion;

[0060] 50. Sampling mechanism; 51. Sampling tube; 52. Slot; 53. Abutment ring; 54. Locking block;

[0061] 60. Adjusting mechanism; 61. Fitting ring; 62. Guide rod; 63. Slider; 64. Housing; 641. First opening; 65. Rotating component; 651. Curved hole; 652. Second opening; 66. Slide groove; 67. Arc groove;

[0062] 70. Sliding mechanism; 71. Mounting bracket; 72. Sleeve; 73. Support frame; 74. Sliding cable. Detailed Implementation

[0063] The following will describe in detail, with reference to the accompanying drawings, a hazardous gas detection device according to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0064] To address the limitations of traditional sampling methods, which still involve direct sampling through ventilation ducts, and thus, when stable flow velocity within the duct cannot be guaranteed, only edge effect interference can be reduced. Furthermore, due to factors such as inadequate duct design, significant uneven gas velocity distribution can easily lead to localized gas stratification, affecting sample representativeness and reducing the accuracy of detection results. This invention proposes a hazardous gas detection device, such as… Figure 1 - Figure 19 As shown:

[0065] The device includes a detection equipment body 10, which includes a detector 11 and a multi-segment sampling pipe 12 installed on the detector 11. The sampling pipe 12 has an air inlet 13 and an exhaust outlet 15 connected to a ventilation duct at both ends. The gas in the ventilation duct enters the sampling pipe 12 through the air inlet 13 and re-enters the ventilation duct through the exhaust outlet 15. When detection is required, the gas flowing through the sampling pipe 12 can be introduced into the detector 11 through the first air guide pipe 14, which meets the requirements for long-term continuous monitoring. The multi-segment sampling pipe 12 is connected to each other through a cutting mechanism 20.

[0066] The interception mechanism 20 includes a valve body 21 disposed between two adjacent sampling pipes 12. The valve body 21 is connected to the sampling pipe 12 through connecting pipes 23 at both ends. A valve core 22 is disposed in the middle of the valve body 21 to block the gas flow. At the same time, the valve core 22 located on both sides of the selected sampling pipe 12 is rotated to close, so as to intercept the gas in the section of the sampling pipe 12. After interception, the gas stops flowing, forming a relatively stable gas sample space, avoiding the problem of component stratification in dynamic flow, and the sample is more uniform. This method is suitable for scenarios with fast gas flow rate and fast concentration change, where it is necessary to quickly intercept stable samples to capture instantaneous states.

[0067] This application also provides an implementation method: close the valve core 22 on the gas outlet side of the selected sampling pipe 12, and after confirming that the gas in the sampling pipe 12 is full and stable, close the valve core 22 on the gas inlet side of the selected sampling pipe 12. At this time, the sample extracted from the sampling pipe 12 is suitable for scenarios with low gas flow rate, significant edge effect, high precision detection requirements, and the need to comprehensively reflect the overall composition and concentration. It should be noted that it takes a certain amount of time for the gas to fill the sampling pipe 12, so it is not suitable for emergency detection.

[0068] In order to extract the gas from the selected sample pipe 12, such as Figures 3-7 As shown, the connecting tube 23 is equipped with an air inlet chamber 25 through the air guide hole 24 on its surface. The air inlet chamber 25 is connected to the sampling pipe 12 through the hole at its end. Preferably, the air inlet chamber 25 is inserted into the connecting tube 23 at 1 / 3 to 2 / 3 of its diameter. This unifies the sampling method, eliminates the influence of positional differences on the results, and avoids the influence of edge eddy zones on sample concentration.

[0069] To prevent gas leaks, such as Figure 3 , Figure 5 and Figure 7 As shown, the intake chamber 25 is equipped with a sealing member 26 with a sealing hole through a rotating mechanism 30. The rotating mechanism 30 includes a positioning shaft 31 fixedly installed in the middle of the intake chamber 25 and a kit 32 rotatably embedded in the positioning shaft 31. The outer wall of the kit 32 is connected to the sealing member 26 and a rotating rod 33 that passes through the positioning shaft 31 is provided in the middle. When sampling is required, the sealing member 26 is rotated so that the sealing member 26 no longer blocks the hole opened in the intake chamber 25, and the gas intercepted in the sampling pipe 12 can enter the intake chamber 25.

[0070] After the sample enters the air inlet chamber 25, the air inlet chamber 25 is connected to the second air guide tube 27 through the sampling mechanism 50. The sampling mechanism 50 includes a sampling tube 51 inserted into the air inlet chamber 25. The sampling tube 51 is connected to the first air guide tube 14 through the second air guide tube 27. The gas in the selected sampling pipe 12 is sequentially introduced into the detector 11 through the second air guide tube 27 and the first air guide tube 14 for detection.

[0071] Furthermore, in order to allow the sealing member 26 to rotate and open the hole in the air intake chamber 25 when the sampling tube 51 is inserted, such as... Figures 7-11 As shown, the sampling tube 51 is driven to rotate by the delayed sealing mechanism 40 set on the rotating rod 33. The delayed sealing mechanism 40 includes a guide shaft 41 set on the rotating rod 33. The guide shaft 41 includes a shaft body 411 connected to the rotating rod 33. An inclined groove 413 is opened on the surface of the shaft body 411. A collar 42 is slidably sleeved on the surface of the shaft body 411. A guide member 43 that cooperates with the inclined groove 413 is provided on the inner wall of the collar 42.

[0072] By inserting the sampling tube 51, the end of the sampling tube 51 pushes the collar 42, which slides along the length of the shaft 411. The guide member 43 pushes the inclined groove 413 to guide the shaft 411 to rotate. The shaft 411 drives the sealing member 26 to rotate through the rotating rod 33, so that the sealing member 26 opens automatically when the sampling tube 51 is inserted into the air intake chamber 25. Preferably, a torsion spring 34 is wound around the surface of the rotating rod 33. Both ends of the torsion spring 34 are connected to the inner wall of the positioning shaft 31. When the sealing member 26 rotates, the rotating rod 33 tightens the torsion spring 34 to store force. Through this design, when the sampling is completed and the sampling tube 51 is pulled out, the torque that drives the sealing member 26 to reverse and reset is released under the action of the elastic deformation recovery of the torsion spring 34, so as to quickly seal the air intake chamber 25.

[0073] Furthermore, such as Figure 8 and Figure 9 As shown, the delayed sealing mechanism 40 also includes at least one through hole 44 opened on the collar 42. The gas entering the air inlet chamber 25 passes through the collar 42 through the through hole 44. Preferably, there are two through holes 44 that are equidistantly arranged around the collar. This design allows the gas entering the air inlet chamber 25 to slowly pass through the through hole 44, thereby controlling the sampling speed and avoiding turbulence caused by excessively fast sampling, which would affect the uniformity of the sample.

[0074] A lifting ring 45 is fixedly connected to the shaft 411 at the outlet of the air inlet chamber 25. The lifting ring 45 is provided with several fitting strips 46 for blocking the through holes 44. The collar 42 is provided with a protrusion 47 for blocking the gap between adjacent fitting strips 46. When the collar 42 descends, the through holes 44 separate from the fitting strips 46. At the same time, the collar 42 drives the protrusion 47 to move out of the gap between adjacent fitting strips 46. The gas passing through the through holes 44 enters the second air guide pipe 27 through the gap.

[0075] Furthermore, such as Figure 11As shown, the surface of the shaft 411 is also provided with a straight groove 412 that communicates with the inclined groove 413. With this design, when the gas sampling is completed and the sampling tube 51 is pulled out, the sealing member 26 drives the shaft 411 to reverse under the drive of the torsion spring 34. The shaft 411 pushes the collar 42 to rise through the cooperation of the inclined groove 413 and the guide member 43. At the same time, the sealing member 26 rotates and closes first, so that the gas cannot enter the air inlet chamber 25. After the guide member 43 slides from the inclined groove 413 into the straight groove 412, the through hole 44 is fitted and closed with the fitting strip 46. The through hole 44 is delayed in closing after the sealing member 26 is closed, so as to reserve time for the gas in the air inlet chamber 25 to be emptied, thereby achieving the purpose of avoiding residual gas from causing sample contamination.

[0076] To prevent the collar 42 from rotating during lifting, such as Figure 9 , Figure 12 and Figure 13 As shown, the sampling mechanism 50 also includes several slots 52 provided at the end of the sampling tube 51. Several locking blocks 54 that cooperate with the slots 52 are installed on the collar 42 through the abutment ring 53 provided on the outer edge. After the slots 52 and the locking blocks 54 are engaged, the rotation of the abutment ring 53 is restricted, thereby achieving the purpose of preventing the collar 42 from rotating during the lifting process. The collar 42 can only control the rotation of the guide shaft 41 through the guide member 43.

[0077] like Figures 13-19 As shown, the sampling tube 51 is slidably disposed in the adjustment mechanism 60. The adjustment mechanism 60 includes a housing 64 sleeved on the surface of the sampling tube 12, and a rotating member 65 is rotatably embedded in the housing 64. At least one groove 66 is opened on the surface of the housing 64, and an arc-shaped groove 67 corresponding to the position of the groove 66 is opened on the surface of the rotating member 65. A guide rod 62 is installed on the sampling tube 51 through a fitting ring 61, and a slider 63 is installed at the end of the guide rod 62. The slider 63 is slidably embedded in the groove 66, and the guide rod 62 passes through the middle of the arc-shaped groove 67.

[0078] To facilitate the rotation of the rotating component 65, anti-slip textures are provided on its surface. By rotating the rotating component 65, it pushes the guide rod 62 through the arc groove 67. The guide rod 62 drives the slider 63 to move horizontally along the length of the groove 66 to limit the movement direction of the guide rod 62. The guide rod 62 drives the sampling tube 51 and the second air guide tube 27 to move through the fitting ring 61, and inserts the sampling tube 51 into the air inlet chamber 25. It should be noted that the rotating component 65 has several curved holes 651 for the second air guide tube 27 to pass through. When the rotating component 65 rotates, the curved holes 651 move in contact with the surface of the second air guide tube 27, thereby avoiding the rotation of the rotating component 65 being restricted by the position of the second air guide tube 27.

[0079] Furthermore, such as Figure 1 , Figure 2 and Figure 17 The housing 64 is slidably disposed on the surface of the sampling pipe 12 via a sliding mechanism 70. The sliding mechanism 70 includes at least two mounting brackets 71 disposed on the housing 64. A sleeve 72 is mounted on the mounting bracket 71. Support brackets 73 are disposed at both ends of the sampling pipe 12. A sliding cable 74 is disposed on the support bracket 73 and passes through the sleeve 72.

[0080] By pushing the housing 64, the housing 64 drives the sleeve 72 to slide under the restriction of the sliding cable 74 through the mounting bracket 71, so that the housing 64 can drive the sampling tube 51 to slide to different positions of the air inlet chamber 25. At the same time, it ensures that the housing 64 always remains coaxial with the valve body 21, and ensures that the connection between the sampling tube 51 and the air inlet chamber 25 does not become misaligned.

[0081] To prevent the valve core 22 from restricting the movement of the housing 64 and the rotating part 65, such as Figure 17 and Figure 18 As shown, the housing 64 and the rotating component 65 are respectively provided with a first opening 641 and a second opening 652 that cooperate with the valve core 22. When it is necessary to adjust the position of the sampling tube 51, the rotating component 65 is rotated in the opposite direction to guide the sampling tube 51 out of the air inlet chamber 25. At the same time, the first opening 641 and the second opening 652 are aligned. When the housing 64 is pushed to slide, the valve core 22 can pass through the first opening 641 and the second opening 652 in sequence, avoiding obstruction by the valve core 22.

[0082] Working principle:

[0083] When sampling in a high-speed flow scenario, rotate to close the valve cores 22 on both sides of the selected sampling pipe 12 to intercept the gas in that section and form a stable sample space. This method is suitable for scenarios where the gas flow rate is fast, the concentration changes rapidly, and instantaneous states need to be captured.

[0084] When sampling in low-speed flow scenarios, first close the valve core 22 on the gas outlet side of the selected sampling pipe 12. After confirming that the gas is full and stable, close the valve core 22 on the gas inlet side. This method is suitable for scenarios with low gas flow rate, significant edge effect, and high precision detection requirements, but is not suitable for emergency detection.

[0085] By pushing the housing 64, the sleeve 72 is slid on the sliding cable 74 via the mounting bracket 71, thereby moving the sampling tube 51 to different air inlet chambers 25, ensuring that the housing 64 and the valve body 21 are coaxial.

[0086] Move the sampling tube 51 to the air inlet chamber 25. By rotating the rotating component 65, it pushes the guide rod 62 through the arc groove 67. The guide rod 62 drives the slider 63 to move along the slide groove 66, thereby driving the sampling tube 51 and the second air guide tube 27 to move, so that the sampling tube 51 is inserted into the air inlet chamber 25. When the rotating component 65 rotates, the curved hole 651 moves to fit the surface of the second air guide tube 27.

[0087] Insert the sampling tube 51, and push the collar 42 at its end. The collar 42 slides along the shaft 411 and guides the shaft 411 to rotate through the guide member 43 and the inclined groove 413. The shaft 411 drives the sealing member 26 to rotate and open the air intake chamber 25 through the rotating rod 33.

[0088] Gas passes through the through hole 44 and through the collar 42. When the collar 42 descends, the through hole 44 separates from the fitting strip 46. The collar 42 drives the protrusion 47 to move out of the gap between the adjacent fitting strip 46, and the gas enters the second gas guide tube 27 through the gap.

[0089] The gas in the selected sample pipe 12 is sequentially introduced into the detector 11 for detection through the second gas guide pipe 27 and the first gas guide pipe 14.

[0090] When the sampling tube 51 is removed, the sealing member 26 drives the shaft 411 to reverse under the action of the torsion spring 34, pushing the collar 42 to rise. The sealing member 26 rotates to close first, and the guide member 43 slides into the straight groove 412 and then the through hole 44 and the fitting strip 46 fit together to close, thus venting the gas in the air intake chamber 25.

[0091] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technology of the present invention and the inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A hazardous gas detection device, comprising a detection device body (10), the detection device body (10) comprising a detector (11) and a multi-segment sampling pipe (12) installed on the detector (11), wherein an air inlet (13) and an exhaust outlet (15) are respectively installed at both ends of the sampling pipe (12), gas in the ventilation duct enters the sampling pipe (12) through the air inlet (13) and re-enters the ventilation duct through the exhaust outlet (15), and the gas flowing through the sampling pipe (12) is introduced into the detector (11) through a first air guide pipe (14), characterized in that, The multiple sampling pipes (12) are interconnected by a cutting mechanism (20); The interception mechanism (20) includes a valve body (21) disposed between two adjacent sampling pipes (12). The valve body (21) is connected to the sampling pipe (12) through connecting pipes (23) at both ends. A valve core (22) is disposed in the middle of the valve body (21) to block the flow of gas. At the same time, the valve cores (22) located on both sides of the selected sampling pipe (12) are rotated to close, so as to intercept the gas in the section of the sampling pipe (12). The connecting pipe (23) is equipped with an air inlet chamber (25) through an air guide hole (24) opened on the surface. The air inlet chamber (25) is connected to the sampling pipe (12) through a hole opened at the end. A sealing member (26) with a sealing hole is disposed in the air inlet chamber (25) through a rotating mechanism (30). The air intake chamber (25) is connected to a second air guide tube (27) via a sampling mechanism (50). The sampling mechanism (50) includes a sampling tube (51) inserted into the air intake chamber (25). The sampling tube (51) is connected to the first air guide tube (14) via the second air guide tube (27).

2. The hazardous gas detection device according to claim 1, characterized in that, The rotating mechanism (30) includes a positioning shaft (31) fixedly disposed in the middle of the air intake chamber (25) and a kit (32) rotatably embedded in the positioning shaft (31). The outer wall of the kit (32) is connected to the sealing member (26) and a rotating rod (33) passing through the positioning shaft (31) is provided in the middle. The sampling tube (51) is driven to rotate by a time-delay sealing mechanism (40) provided on the rotating rod (33). The rotating rod (33) is wound with a torsion spring (34). Both ends of the torsion spring (34) are connected to the inner wall of the positioning shaft (31). When the closure (26) rotates, it stores force by twisting the torsion spring (34) through the rotating rod (33).

3. The hazardous gas detection device according to claim 2, characterized in that, The time-delay sealing mechanism (40) includes a guide shaft (41) disposed on the rotating rod (33). The guide shaft (41) includes a shaft body (411) connected to the rotating rod (33). An inclined groove (413) is provided on the surface of the shaft body (411). A collar (42) is slidably sleeved on the surface of the shaft body (411). A guide member (43) that cooperates with the inclined groove (413) is provided on the inner wall of the collar (42).

4. The hazardous gas detection device according to claim 3, characterized in that, The delayed sealing mechanism (40) also includes at least one through hole (44) opened on the collar (42), through which gas entering the air inlet chamber (25) passes through the collar (42). In addition, a lifting ring (45) is provided at the outlet of the air intake chamber (25) and fixedly connected to the shaft (411). The lifting ring (45) is provided with a number of interlocking strips (46) that block the through holes (44), and the collar (42) is provided with a protrusion (47) for blocking the gap between adjacent interlocking strips (46).

5. A hazardous gas detection device according to claim 4, characterized in that, The surface of the shaft (411) is also provided with a straight groove (412) that communicates with the inclined groove (413). The shaft (411) pushes the collar (42) up through the cooperation of the inclined groove (413) and the guide (43), while the sealing member (26) rotates and closes first, preventing gas from entering the air intake chamber (25). After the guide (43) slides from the inclined groove (413) into the straight groove (412), the through hole (44) and the fitting strip (46) fit and close, so that the through hole (44) closes after the sealing member (26) closes, reserving time for the gas in the air intake chamber (25) to be emptied.

6. A hazardous gas detection device according to claim 3, characterized in that, The sampling mechanism (50) also includes several slots (52) provided at the end of the sampling tube (51). Several blocks (54) that cooperate with the slots (52) are installed on the collar (42) through the abutment ring (53) provided on the outer edge. After the slots (52) and the blocks (54) are engaged, the rotation of the abutment ring (53) is restricted.

7. A hazardous gas detection device according to claim 6, characterized in that, The sampling tube (51) is slidably disposed in the adjustment mechanism (60). The adjustment mechanism (60) includes a housing (64) sleeved on the surface of the sampling tube (12), and a rotating component (65) is rotatably embedded in the housing (64). At least one sliding groove (66) is opened on the surface of the housing (64), and an arc-shaped groove (67) corresponding to the position of the sliding groove (66) is opened on the surface of the rotating component (65). The sampling tube (51) is equipped with a guide rod (62) through a fitting ring (61), and a slider (63) is installed at the end of the guide rod (62). The slider (63) is slidably embedded in the groove (66), and the guide rod (62) passes through the middle of the arc groove (67).

8. A hazardous gas detection device according to claim 7, characterized in that, The rotating part (65) has several curved holes (651) on its surface for the second air guide tube (27) to pass through.

9. A hazardous gas detection device according to claim 7, characterized in that, The housing (64) and the rotating part (65) are respectively provided with a first opening (641) and a second opening (652) that cooperate with the valve core (22).

10. A hazardous gas detection device according to claim 9, characterized in that, The housing (64) is slidably disposed on the surface of the sampling pipe (12) via a sliding mechanism (70). The sliding mechanism (70) includes at least two mounting brackets (71) disposed on the housing (64), and a sleeve (72) is mounted on the mounting bracket (71). In addition, support frames (73) are set at both ends of the sampling pipe (12), and a sliding cable (74) that passes through the sleeve (72) is set on the support frame (73).

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