Multi-parameter hazardous gas detection and analysis device

Abstract

The invention discloses a multi-parameter hazardous gas detection and analysis device which comprises a conveying assembly, the conveying assembly comprises two pipelines and sealing gaskets, and flanges are fixedly arranged outside the pipelines in a sleeving mode; a sealing assembly is arranged between the flange and the sealing gasket and comprises sealing units distributed in an annular array mode, and air leakage holes are formed in the flange. The detection assembly comprises an inner shell cover and an outer shell cover, and the air exhaust assembly comprises a negative pressure pump; and an on-off device. Compared with the prior art, the multi-parameter hazardous gas detection and analysis device has the advantages that gas in the inner surrounding cavity and the outer surrounding cavity can be detected through the inner probe and the outer probe respectively, reference is provided for gas leakage positions, and after leakage occurs to the flange and the sealing gasket, the on-off assembly controls the gas leakage holes to be communicated with the inner surrounding cavity through the switching holes in sequence, so that gas leakage is avoided. The gas flow path is convenient to detect, later maintenance is facilitated, the troubleshooting time is shortened, and the maintenance efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of hazardous gas detection technology, and in particular to a multi-parameter hazardous gas detection and analysis device. Background Technology

[0002] Petrochemical pipeline connections are high-risk leakage points. Leaked hazardous gases (such as hydrocarbons, hydrogen sulfide, and carbon monoxide) can diffuse into the surrounding environment, causing adverse effects on safety, the environment, and the economy. Therefore, hazardous gas detection and analysis instruments are needed to detect the degree of leakage at pipeline connections, enabling timely maintenance after a leak occurs. Hazardous gas detection and analysis instruments can select corresponding detection probes for concentration detection based on different gas types. Therefore, by equipping different probes, different types of hazardous gas leaks can be detected. For example, catalytic combustion probes can detect the concentration of flammable gases such as methane and ethane, electrochemical probes can detect the concentration of toxic gases such as hydrogen sulfide and carbon monoxide, and photoionization probes can detect the concentration of volatile organic compound (VOC) hazardous gases.

[0003] To prevent leaked gas in pipelines from being easily dispersed in open environments and to avoid interference from dust, water vapor, and other external factors, thereby improving detection accuracy and sensitivity, existing technologies typically employ flexible sealing covers, customized cavity clamps, and other enclosing devices at pipeline joints to completely enclose flanges, bolts, and other joints. This creates an enclosed cavity isolated from the external environment, within which a detector probe is placed to detect gas leaks at the pipeline joints.

[0004] While the aforementioned enclosed detection device can resist interference from the external environment and improve detection sensitivity, it can only detect whether a leak has occurred at the pipe joint and the amount of leakage. It cannot determine the path of the gas leak, that is, it cannot determine the specific location from which the gas in the pipe starts to leak. In the actual use of pipelines to transport hazardous gases, there is a possibility of leakage between flanges and pipes, and between flanges and gaskets. Therefore, detecting the leakage path and the location of the leakage source of hazardous gases has extremely high practical significance and value for pipeline maintenance in industries such as petrochemicals.

[0005] Therefore, it is necessary to improve existing hazardous gas detection and analysis devices. Summary of the Invention

[0006] The purpose of this invention is to overcome the deficiencies in the existing technology and provide a multi-parameter hazardous gas detection and analysis device that can detect the location of the leak source and the path of gas leakage.

[0007] To achieve the above-mentioned technical effects, the technical solution of the present invention is as follows: a multi-parameter hazardous gas detection and analysis device, comprising a conveying assembly for conveying hazardous gases, wherein the conveying assembly includes two coaxial pipes and a sealing gasket disposed between the two pipes, a flange is fixedly sleeved on the end of each pipe adjacent to the sealing gasket, and the sealing gasket is clamped between the corresponding flanges of the two pipes by a fastening unit; characterized in that: The sealing surfaces of the flange and the gasket are provided with sealing assemblies distributed radially along the flange. The sealing assemblies include sealing units arranged in a ring array with the flange axis as the center line. Each sealing unit includes a sealing protrusion and a sealing recess. The outer circumferential edge of the sealing protrusion is sealed and fitted with the inner circumferential wall of the sealing recess, and the sealing protrusion and the inner wall of the sealing recess enclose a leakage cavity. The flange is provided with leakage holes that correspond one-to-one with the leakage cavities. Also includes: The detection assembly is located on the side of the flange facing away from the gasket, and includes an inner shell and an outer shell. The outer shell, together with the flange and the pipe, forms an outer enclosing cavity. An external barometer and an external probe are disposed within the outer shell. The inner shell is disposed within the outer shell and contains an inner enclosing cavity. An internal barometer and an internal probe are disposed within the inner enclosing cavity. The inner shell and the outer shell are respectively fixedly connected to an internal exhaust pipe and an external exhaust pipe. The air extraction assembly includes a negative pressure pump, the input end of which is connected to the inner air extraction pipe and the outer air extraction pipe and is respectively connected to an inner valve and an outer valve, and the output end is used to connect to a buffer device. A switching device is used to connect and disconnect each air leakage hole from the inner surrounding cavity.

[0008] Preferably, in order to achieve both communication and isolation between the vent hole and the surrounding cavity, the switching device includes: A sealing cover, together with the side of the flange facing away from the sealing gasket, forms a sealing cavity located outside the pipe. The sealing cover is also provided with an exhaust hole that corresponds one-to-one with the leakage hole and communicates with the inner enclosing cavity. A switching ring is radially distributed within the sealing cover and corresponds one-to-one with the sealing assembly. Its coaxial centerline is located outside the pipe. It is provided with a switching hole and multiple connecting holes, all of which are through holes with their axial directions parallel to the pipe axis. The connecting holes are arranged in a ring array on the switching ring and the number of them is equal to the leakage holes corresponding to the sealing assembly. The centerlines of the switching hole and the connecting holes are located on the same cylindrical surface. A rotating component drives the switching device to rotate around its own axis, such that each connecting hole is connected between a pair of vent holes and vent holes and both ends of the switching hole are closed, or both ends of each connecting hole are closed and the switching hole is connected between one of a pair of vent holes and vent holes, or both ends of each connecting hole and the switching hole are closed.

[0009] Preferably, in order to facilitate the control of the connection and disconnection between the switching hole, the connecting hole and the inner surrounding cavity on the on / off ring, the two connecting holes located on both sides of the switching hole are equidistant from the switching hole.

[0010] Preferably, in order to facilitate the rotation of the switching ring and adjust the position of the connecting hole and the switching hole on the switching ring, the switching ring includes a ring body and flanges with coaxial center lines fixed to the outer circumferential edges at both ends of the ring body. The outer circumferential edges of the ring body are integrally formed with a toothed ring located between the flanges at both ends. The rotating assembly includes a driving unit and a transmission gear. The transmission gear meshes with the toothed ring in a one-to-one correspondence. The driving unit is driven and connected to the transmission gear.

[0011] Preferably, in order to drive the transmission gear to rotate, the drive unit includes: The driving gear is coaxial with the transmission gear and slides along its own axis on the side of the transmission gear opposite to the sealing gasket. The driving gears mesh with each other and are provided with a plug shaft and a plug hole that are inserted and fitted along the axis of the pipe. The plug shaft and the plug hole are offset from the axis of the driving gear. A drive motor and a drive gear, wherein the drive motor is fixed inside the housing and is driven by the drive gear, and the drive gear meshes with one of the driving gears; The elastic element is connected to the driving gear in a one-to-one correspondence, and is used to make the driving gear tend to move away from the corresponding transmission gear to separate the insert shaft and the insertion hole; A pressing mechanism is used to overcome the resistance of the elastic element to push the drive gear toward the transmission gear to achieve the insertion of the insertion shaft and the insertion hole.

[0012] Preferably, in order to compress the drive gear so that it can dock with the transmission gear, the compression mechanism includes a translation unit and a compression member. The output end of the translation unit is disposed inside the outer casing and connected to the compression member. The movement trajectory of the compression member is parallel to the distribution direction of the transmission gear.

[0013] Preferably, to reduce wear, the extrusion member includes an extrusion roller that rotates about its own axis at the output end of the translation unit, and the axial direction of the extrusion roller is perpendicular to the distribution direction of the transmission gear and the axial direction of the pipe.

[0014] Preferably, in order to precisely control the rotation angle of each on / off ring, the sealing units are densely and evenly distributed between the flange and the sealing gasket, and the specifications and dimensions of each drive gear are consistent, as are the specifications and dimensions of each transmission gear.

[0015] Preferably, in order to ensure the airtightness of the connection between the outer casing and the pipe, one end of the outer casing is fixedly connected to the flange, and the other end is provided with an assembly through hole for the pipe to pass through. The assembly through hole is coaxial with the pipe, and an elastic sealing ring is sandwiched between the inner wall of the assembly through hole and the circumferential outer edge of the pipe.

[0016] Preferably, in order to further enhance the sealing connection between the outer casing and the pipe, the inner diameter of the assembly through hole at one end adjacent to the flange is smaller than the inner diameter at the other end, and the assembly through hole is gradually transitioned from one end to the other.

[0017] In summary, compared with the prior art, the multi-parameter hazardous gas detection and analysis device of the present invention can detect the gas in the inner and outer surrounding cavities respectively through the inner and outer probes, providing a reference for the location of gas leaks. After a leak occurs between the flange and the gasket, the on / off component controls each leak hole to connect to the inner surrounding cavity in sequence through the switching hole, which facilitates the detection of the gas flow path, helps with later maintenance, shortens the troubleshooting time, and improves maintenance efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 An explosion diagram; Figure 3 This is a schematic diagram of the sealing gasket structure of the present invention; Figure 4 This is a schematic diagram of the connection structure between the pipe, the sealing gasket, and the detection component of the present invention; Figure 5 yes Figure 4 An explosion diagram; Figure 6 yes Figure 4 An illustration of the explosion from another perspective; Figure 7 yes Figure 4 Vertical cross-sectional structural diagram; Figure 8 yes Figure 4 A cross-sectional structural diagram; Figure 9 This is a schematic diagram of the on / off device of the present invention; Figure 10 yes Figure 9 An explosion diagram; Figure 11This is a schematic diagram of the on / off device of the present invention from another perspective; Figure 12 yes Figure 11 Vertical cross-sectional structural diagram; Figure 13 yes Figure 12 Enlarged view of part A; Figure 14 yes Figure 11 An explosion diagram; In the diagram: 1. Conveying assembly; 11. Pipeline; 12. Sealing gasket; 121. Sealing protrusion; 13. Flange; 131. Sealing recess; 132. Leakage hole; 133. Leakage pipe; 134. Guide ring; 1341. Notch; 135. Back plate; 14. Bolt; 15. Nut; 2. Detection assembly; 21. Inner shell; 211. Inner extraction pipe; 212. Inner barometer; 213. Inner probe; 22. Outer shell; 221. Outer extraction pipe; 222. Outer barometer; 223. Outer probe; 224. Assembly through hole; 225. Sealing ring; 226. Fixing bracket; 3. Extraction assembly; 31. Negative pressure pump; 32. Inner valve; 33. Outer valve; 4. Sealing cover ; 41. Air extraction port; 5. On / off ring; 51. Switching hole; 52. Connecting hole; 53. Ring body; 54. Flanged edge; 55. Gear ring; 6. Rotating assembly; 61. Drive unit; 611. Drive gear; 6111. Insert shaft; 6112. Drive bearing; 612. Drive motor; 613. Drive gear; 614. Elastic element; 6141. Slide rod; 6142. Pressure plate; 615. Extrusion mechanism; 6151. Extruded part; 6152. Translation motor; 6153. Translation screw; 6154. Translation screw sleeve; 6155. Translation bearing; 6156. Translation guide rod; 62. Transmission gear; 621. Insertion hole; 622. Concentric shaft; 623. Concentric wheel. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0020] like Figures 1-14 As shown, the multi-parameter hazardous gas detection and analysis device of the present invention includes a conveying assembly 1 for conveying hazardous gas. The conveying assembly 1 includes two pipes 11 with coaxial centerlines and a sealing gasket 12 disposed between the two pipes 11. A flange 13 is fixedly sleeved on the end of each pipe 11 adjacent to the sealing gasket 12. The sealing gasket 12 is clamped between the flanges 13 corresponding to the two pipes 11 by a fastening unit. A sealing assembly is provided on the sealing contact surface of the flange 13 and the gasket 12, which is radially distributed along the flange 13. The sealing assembly includes sealing units arranged in a ring array with the center line of the flange 13 as the center line. The sealing unit includes a sealing protrusion 121 and a sealing recess 131. The outer circumferential edge of the sealing protrusion 121 is sealed and fitted with the inner circumferential wall of the sealing recess 131, and the inner wall of the sealing protrusion 121 and the sealing recess 131 enclose a leakage cavity. A leakage hole 132 is provided on the flange 13, which corresponds to and communicates with the leakage cavity. The multi-parameter hazardous gas detection and analysis device of the present invention further includes: The detection component 2 is located on the side of the flange 13 facing away from the sealing gasket 12, and includes an inner shell cover 21 and an outer shell cover 22. The outer shell cover 22, together with the flange 13 and the pipe 11, forms an outer enclosing cavity. An external barometer 222 and an external probe 223 are installed inside the outer enclosing cavity. The inner shell cover 21 is located inside the outer shell cover 22 and has an inner enclosing cavity. An internal barometer 212 and an internal probe 213 are installed inside the inner enclosing cavity. The inner shell cover 21 and the outer shell cover 22 are respectively fixedly connected to an internal exhaust pipe 211 and an external exhaust pipe 221. The air extraction assembly 3 includes a negative pressure pump 31. The input end of the negative pressure pump 31 is connected to the inner air extraction pipe 211 and the outer air extraction pipe 221 and is respectively connected to the inner valve 32 and the outer valve 33. The output end is used to connect to the buffer device. The on / off device is used to connect and disconnect each vent hole 132 from the inner enclosure cavity.

[0021] In the multi-parameter hazardous gas detection and analysis device of the present invention, the conveying component 1 includes two coaxial pipes 11. Two flanges 13 are fixedly fitted onto the adjacent ends of the two pipes 11. The flanges 13 and pipes 11 are connected by welding. A sealing gasket 12 is clamped between the two flanges 13 by a ring-shaped array of fastening units. The sealing gasket 12, flanges 13, and pipes 11 are all coaxial. The fastening units include threaded bolts 14 and nuts 15. With this structure, the sealing connection between the sealing gasket 12 and the flanges 13 enables the transmission of hazardous gas between the two pipes 11.

[0022] After prolonged use, various factors (such as aging of the gasket 12, decrease in the preload of the bolt 14, corrosion damage to the sealing surface of the gasket 12 by hazardous gases, corrosion damage to the weld between the flange 13 and the pipe 11 by hazardous gases, and defects in the installation process) can easily lead to a decrease in sealing performance, resulting in leakage of hazardous gases between the gasket 12 and the flange 13 and / or between the flange 13 and the pipe 11.

[0023] To facilitate the detection of the source of hazardous gas leaks and for subsequent maintenance, in the detection component 2 of this invention, one end of the outer casing 22 is welded and fixedly connected to the flange 13, and the other end is sealed and fitted over the pipe 11, so that the outer casing 22, the flange 13, and the pipe 11 enclose an outer cavity. Inside the outer cavity, an inner casing 21 is provided, which has an inner cavity. Multiple sealing units are provided on the sealing mating surface of the sealing gasket 12 and the flange 13. Each sealing unit consists of a sealing protrusion 121 and a sealing recess 131. A vent hole 132 is provided on the flange 13, which connects the vent hole formed by the sealing units and the inner cavity. An inner probe 213 and an outer probe 223 are respectively provided in the inner cavity and the outer cavity. Both the inner probe 213 and the outer probe 223 are used to connect to a collector located outside the outer casing 22. The collector is connected to a processor (both the collector and the processor are shown in the figure).

[0024] With the above structure, the outer casing 22 can cover the connection position between the flange 13 and the pipe 11, preventing the data acquisition of the inner probe 213 and the outer probe 223 from being affected by the external environment. The inner probe 213 and the outer probe 223 are used to detect the hazardous gas leakage data of the inner and outer enclosing cavities, respectively, and transmit the data to the data acquisition unit. The data acquisition unit uploads the collected data to the processor, which processes and analyzes the data to determine the hazardous gas concentration data in the inner and outer enclosing cavities. It should be noted that the data transmission method in this invention includes both wired and wireless transmission, both of which are mature technologies in industrial applications and will not be elaborated on here.

[0025] When a leak occurs between flange 13 and pipe 11, a weld is formed between flange 13 and pipe 11 in the circumferential direction, allowing hazardous gas to enter the outer enclosure cavity through the weld. In this case, external probe 223 can detect the hazardous gas entering the outer enclosure cavity. When a gap occurs between gasket 12 and flange 13, hazardous gas can flow through the gap between gasket 12 and flange 13 into the leakage cavity formed by a sealing protrusion 121 and sealing recess 131, and then enter the inner enclosure cavity through leakage hole 132. In this case, internal probe 213 can detect the hazardous gas entering the inner insulation cavity. Therefore, with the above structure, it is possible to determine whether the hazardous gas leaks between flange 13 and pipe 11 or between flange 13 and gasket 12.

[0026] Furthermore, in this invention, the inner shell 21 and the outer shell 22 are respectively fixedly connected to an inner exhaust pipe 211 and an outer exhaust pipe 221. On the outside of the outer shell 22, an exhaust assembly 3 is provided. In the exhaust assembly 3, the input end of the negative pressure pump 31 is provided with four openings. Two of the four openings are respectively connected to the inner exhaust pipes 211 corresponding to the two pipes 11 through two inner valves 32, and the remaining two are respectively connected to the outer exhaust pipes 221 corresponding to the two pipes 11 through two outer valves 33. In addition, an inner barometer 212 and an outer barometer 222 electrically connected to the collector are respectively provided in the inner and outer enclosing cavities. The output end of the negative pressure pump 31 is connected to a buffer device (not shown in the figure). The buffer device is usually a buffer tank, which is used to temporarily store hazardous gases. After a certain period of storage, the temporarily stored hazardous gases are periodically purified and converted. This is a mature technology in industrial applications and will not be elaborated on here.

[0027] With the above structure, during equipment operation, the inner valve 32 and outer valve 33 are opened, and the negative pressure pump 31 draws gas from the inner casing 21 and outer casing 22. The internal pressure is detected by the inner barometer 212 and outer barometer 222. When the pressure drops to a preset negative pressure environment, the inner valve 32 and outer valve 33 close, creating a negative pressure environment in the inner and outer enclosures. When gas leaks, because the internal pressure of the inner and outer enclosures is lower than the pressure in pipe 11, it facilitates the flow of hazardous gas from pipe 11 compared to its natural flow. The leaked hazardous gas enters the inner or outer enclosure cavity, thereby improving the detection accuracy of the inner probe 213 and the outer probe 223. In addition, after obtaining the leaked gas data, the inner valve 32 or the outer valve 33 can be opened periodically to transport the leaked hazardous gas to the buffer device through the negative pressure pump 31. Then the inner valve 32 or the outer valve 33 is closed. Before maintenance, the leaked hazardous gas is transported to the buffer device at regular intervals to prevent the hazardous gas from spreading into the external environment, causing environmental pollution and increasing the cost of hazardous gas treatment.

[0028] In addition, this device can not only detect dangerous gas leaks between flange 13 and gasket 12 or between flange 13 and pipe 11, but also track the specific flow path of gas leaking between flange 13 and gasket 12, so as to facilitate later maintenance, shorten troubleshooting time, improve maintenance efficiency, reduce safety risks, and prevent the leakage from expanding, as detailed below.

[0029] In this invention, multiple sets of sealing components are provided (three sets are shown in the figure, but other numbers are also possible), which are equally spaced along the radial direction of the flange 13. Each sealing component includes a ring array of sealing units (twenty are shown in the figure, and the cross-sections of the sealing recesses 131 and sealing protrusions 121 in the sealing units are arc-shaped, but other numbers are also possible). In the same sealing component, two adjacent sealing units are closely arranged along the flange 13. Two adjacent sealing components are closely arranged, that is, the sealing units mainly composed of paired sealing protrusions 121 and sealing recesses 131 are closely arranged on the mating surface of the flange 13 and the sealing gasket 12.

[0030] More specifically, the sealing protrusion 121 is disposed on the sealing gasket 12, and the sealing recess 131 is disposed on the side of the flange 13 adjacent to the sealing gasket 12, and the recess depth of the sealing recess 131 is greater than the protrusion height of the sealing protrusion 121. In this way, when the sealing gasket 12 and the flange 13 are tightly fitted, a leakage cavity corresponding to the leakage hole 132 can be formed.

[0031] By adopting the above structure, the sealing contact area between the gasket 12 and the flange 13 can be significantly increased, thereby enhancing the sealing performance and reducing the possibility of dangerous gases leaking between the gasket 12 and the flange 13 after long-term use.

[0032] In the initial stage of equipment operation, the on / off device controls the isolation of each vent hole 132 corresponding to the vent chamber in the outermost and middle sealing components from the inner surrounding cavity, keeping each vent hole 132 corresponding to the vent chamber in the inner sealing component connected to the inner surrounding cavity. When dangerous gas leaks from between the gasket 12 and the flange 13, it will inevitably leak from the inside of the pipe 11 outwards. During the leakage process, it enters one or more vent chambers and then enters the inner surrounding cavity through the vent hole 132, so that the inner probe 213 detects the leakage data of dangerous gas.

[0033] Upon detecting a hazardous gas leak, the switching device isolates each leaking hole 132 from the inner enclosure cavity, drawing away the hazardous gas from the inner enclosure cavity. Then, the switching device sequentially controls each leaking hole 132 to remain connected to the inner enclosure cavity for a period of time along the circumference of the flange 13, while isolating the remaining leaking holes 132 from the inner enclosure cavity. During the period when a leaking hole 132 remains connected to the inner enclosure cavity, the inner probe 213 detects whether any hazardous gas has leaked into the inner enclosure cavity. If no hazardous gas is detected, the switching device controls the next leaking hole 132 to connect to the inner enclosure cavity, while the remaining leaking holes 132 remain isolated. The gas is isolated from the inner enclosure cavity; otherwise, the dangerous gas will enter the inner enclosure cavity through the leak hole 132, thus indicating that there is a leak between the sealing units corresponding to the leak hole 132. After the leak is detected, the on-off device isolates each leak hole 132 from the inner enclosure cavity. After the dangerous gas in the inner enclosure cavity is extracted by the air extraction component 3, the on-off device controls the next leak hole 132 to connect with the inner enclosure cavity. This continues until each leak hole 132 is individually connected to the inner enclosure cavity. The device then completes the detection of the innermost sealing component, thereby determining the location of the gas leak at the innermost position.

[0034] Subsequently, the on / off device controls both the innermost and outermost vent holes 132 to remain isolated from the inner enclosure cavity. At the same time, each vent hole 132 corresponding to the vent cavity in the intermediate sealing assembly remains connected to the inner enclosure cavity. If the flange 13 and the corresponding intermediate side position of the gasket 12 are well sealed, the content of hazardous gas detected by the inner probe 213 in the inner enclosure cavity will always be lower than the preset range (or directly zero) during the period of maintaining the connection. Otherwise, when there is a leak in the intermediate side position, the hazardous gas will inevitably enter one or more vent cavities in the intermediate side, and then enter the inner enclosure cavity from the corresponding vent hole 132, so that the inner probe 213 detects the leakage data of hazardous gas.

[0035] After detecting a dangerous gas leak at the intermediate side, the switching device controls each leak hole 132 on the intermediate side to be isolated from the inner enclosure cavity in the manner described above, and extracts the dangerous gas from the inner enclosure cavity. Then, the switching device controls each leak hole 132 on the intermediate side to remain connected to the inner enclosure cavity for a period of time along the circumference of the flange 13, while isolating the remaining leak holes 132 from the inner enclosure cavity. In conjunction with the inner probe 213, it detects whether the sealing unit corresponding to the leak hole 132 has experienced a gas leak. Based on the detection results, the extraction assembly 3 and the switching device perform the above operations. If there is a gas leak, the gas in the inner enclosure cavity is promptly removed. If there is no gas leak, the next leak hole 132 is detected. Finally, the detection of the intermediate side sealing assembly is completed, thereby determining the location of the gas leak on the intermediate side.

[0036] Subsequently, the switching device controls the innermost and middle leakage holes 132 to remain isolated from the inner enclosure cavity. At the same time, the leakage holes 132 corresponding to the leakage chambers in the outermost sealing assembly remain connected to the inner enclosure cavity. If the flange 13 and the sealing gasket 12 are properly sealed at their corresponding outermost positions, the content of hazardous gas detected by the inner probe 213 in the inner enclosure cavity will always be lower than the preset range (or directly zero) during the period of maintaining the connection. Otherwise, when there is a leak at the outermost position, the hazardous gas will inevitably enter one or more of the outermost leakage chambers and then enter the inner enclosure cavity through the corresponding leakage hole 132, so that the inner probe 213 detects the leakage data of hazardous gas.

[0037] When a gas leak is detected on the outermost side, the switching device and the air extraction assembly 3 shall, in accordance with the above-described detection method for the innermost and middle sealing assemblies, detect the leak holes 132 corresponding to the leaking chamber of the outermost sealing assembly one by one. Before detection, the gas in the inner surrounding cavity shall be discharged through the air extraction assembly 3. During detection, one of the leak holes 132 shall be kept in communication with the inner surrounding cavity, and the detection shall be performed through the inner probe 213. Finally, the detection of whether there is a gas leak in each sealing unit on the outermost side shall be completed.

[0038] Therefore, this detection and analysis device can not only detect dangerous gas leaks between flange 13 and pipe 11 and / or between flange 13 and gasket 12, but also, after employing the above method, sequentially determine the gas leakage flow location from the inside out, and determine the gas leakage path through each gas leakage flow location. Furthermore, the internal probe 213 can detect the leakage concentration, thereby determining the degree of dangerous gas leakage, that is, determining the sealing degree and leakage degree at each point of the sealing connection between flange 13 and gasket 12. This not only helps to significantly improve efficiency and reduce safety risks, but also saves operation and maintenance costs, achieving a key breakthrough from passive leak plugging to precise policy implementation. When a leak is detected in the innermost sealing component while the middle and outermost sealing components are still in good condition, it serves as a preventative measure, alerting relevant management personnel that a leak exists on one side of the flange 13 and gasket 12, and that a leak may occur after a period of use. It also provides an early warning of leakage in pipe 11, avoiding the need to trigger an alarm only after a leak has occurred, thus enabling timely damage mitigation.

[0039] Specifically, compared to traditional detection and analysis devices that can only determine that a leak occurs at the joint of pipe 11 but cannot pinpoint the exact location of the leak, maintenance personnel typically need to completely disassemble and inspect the sealing surface of the entire flange 13, the sealing plate of the gasket 12, bolts 14, and other components, sometimes even performing multiple disassembly and reassembly leak tests, which is time-consuming and labor-intensive. In contrast, the detection and analysis device of this invention can determine whether the gas leaks from between pipe 11 and flange 13 or between flange 13 and gasket 12; it can also detect the path of gas leakage and provide early warning before a leak occurs. During maintenance, it is not necessary to reconnect all bolts 14; maintenance personnel can perform corresponding operations at the leak location for local repair or replacement, significantly shortening downtime for maintenance and thus reducing the impact on industrial production. Furthermore, since pipe 11 mainly transports flammable, explosive, or toxic gases... If a leak cannot be accurately located for a long period, there is a risk of large-scale leakage, which could lead to dangerous accidents such as fires, explosions, or poisoning. The leak detection device of this invention can detect leaks sequentially from the inside out, identify high-risk leaks in advance, predict the direction of the spread of seal failure, and take temporary sealing measures in time, such as local injection of adhesive, to prevent the leak from worsening and avoid blind operation in the leak area, which could lead to safety hazards. In addition, by accurately locating the leak, unnecessary spare parts consumption can be reduced. There is no need to replace the entire sealing gasket 12, flange 13, bolt 14, or nut 15. The leakage path of hazardous gases can be included in the relevant operation and maintenance files of pipeline 11, which facilitates risk classification of flanges 13 of different areas and specifications, prioritizes maintenance of locations prone to leaks, avoids one-size-fits-all overhauls, and improves the maintenance efficiency of operation and maintenance resources.

[0040] Therefore, this detection and analysis device can promptly determine the location and extent of leaks, and detect multiple parameters such as the gas leakage path. This effectively meets the market demand in the field of industrial hazardous gas safety operation and maintenance, enhances its application value, and ensures high safety and high continuity in the transportation of hazardous gases such as petrochemical and natural gas.

[0041] A further improvement is that the switching device includes: The sealing cover 4, together with the side of the flange 13 facing away from the sealing gasket 12, forms a sealing cavity located outside the pipe 11. The sealing cover 4 is also provided with an exhaust hole 41 that corresponds one-to-one with the leakage hole 132 and communicates with the inner surrounding cavity. The switching ring 5 is radially distributed within the sealing cover 4 along the pipe 11 and corresponds one-to-one with the sealing components. Its coaxial centerline is located outside the pipe 11. It is provided with a switching hole 51 and multiple connecting holes 52, all of which are through holes with their axial directions parallel to the axial direction of the pipe 11. The connecting holes 52 are arranged in a ring array on the switching ring 5 and their number is equal to the leakage holes 132 corresponding to the sealing components. The centerlines of the switching hole 51 and the connecting holes 52 are located on the same cylindrical surface. The rotating component 6 drives the switching ring 5 to rotate around its own axis, so that each connecting hole 52 is connected between a pair of leakage holes 132 and extraction holes 41 and both ends of the switching hole 51 are closed, or both ends of each connecting hole 52 are closed and the switching hole 51 is connected between one of a pair of leakage holes 132 and extraction holes 41, or both ends of each connecting hole 52 and the switching hole 51 are closed.

[0042] Specifically, since the sealing components in this invention are distributed in three sets at equal intervals along the radial direction of the flange 13, there are correspondingly three on / off rings 5, all of which are coaxial with the pipe 11. The two sides of the on / off rings 5 ​​are respectively attached to the inner walls of the flange 13 and the sealing cover 4.

[0043] More specifically, such as Figure 5 As shown, in this invention, the side of the vent 132 facing away from the sealing gasket 12 is fixedly connected to a vent pipe 133 extending along the axial direction parallel to the pipe 11. The vent pipe 133 is fixedly connected to a back plate 135 coaxially sleeved outside the pipe 11. The side of the back plate 135 facing away from the vent pipe 133 is fixedly connected to five guide rings 134 coaxial with the pipe 11. The five guide rings 134 and three on / off rings 5 ​​are sequentially spaced and closely connected. The opening of the sealing cover 4 faces the sealing gasket 12, and its circumferential inner wall is fixedly connected to the circumferential outer edge of the outermost guide ring 134. The end of the guide ring 134 away from the back plate 135 is fixedly connected to the inner wall of the sealing cover 4. The side of the on / off ring 5 away from the back plate 135 is close to the inner wall of the sealing cover 4. In this way, it is ensured that the on / off ring 5 can rotate stably around its own axis between the back plate 135, the guide rings 134 and the sealing cover 4.

[0044] The side of the sealing cover 4 facing away from the guide ring 134 is fixedly connected to the inner shell cover 21 to seal the inner enclosure cavity of the inner shell cover 21. The sealing cover 4 is provided with an equal number of air extraction holes 41 that correspond one-to-one with the air leakage holes 132 on the same axis. The switching ring 5 is provided with twenty connecting holes 52 arranged in an equally spaced annular array and one switching hole 51. The switching hole 51 is located between two of the connecting holes 52. The twenty connecting holes 52 correspond to the air leakage holes 132 corresponding to the twenty sealing units in the sealing assembly.

[0045] With the above structure, the rotating component 6 can control the rotation of the three on / off rings 5 ​​around their own axis, controlling the rotation angle of the three on / off rings 5, thereby adjusting the position of the twenty connecting holes 52 and one switching hole 51 on the three on / off rings 5. More specifically, the rotating component 6 can control the rotation angle of the on / off rings 5 ​​to periodically switch the on / off rings 5 ​​between three working positions, as described below: At the first station, the twenty connecting holes 52 on the switching ring 5 are located one-to-one with the coaxial center line between the twenty pairs of leakage pipes 133 and twenty extraction holes 41, and the two ends of the switching hole 51 are respectively sealed by the back plate 135 and the inner wall of the sealing cover 4. At this station, the leaked dangerous gas can enter the inner enclosure cavity in sequence through the leakage cavity, leakage hole 132, leakage pipe 133, connecting hole 52 and extraction hole 41 to detect whether there is dangerous gas leaking into the inner enclosure cavity at the inner, middle or outer sealing components. In the second station, the two ends of the twenty connecting holes 52 on the switching ring 5 are respectively sealed by the back plate 135 and the inner wall of the sealing cover 4. The two ends of the switching hole 51 are respectively connected to a pair of leakage pipes 133 and extraction holes 41. If a dangerous gas leak occurs at the sealing unit corresponding to the leakage pipe 133, the gas in the pipe 11 can enter the inner enclosure cavity in sequence through the leakage chamber, leakage hole 132, leakage pipe 133, switching hole 51 and extraction hole 41. In this way, it is convenient to detect the inside of the sealing assembly on the inner, middle or outer side, and to determine which sealing unit has a gas leak. In the third station, both ends of the twenty connecting holes 52 on the on / off ring 5 and both ends of the switching hole 51 are respectively sealed by the back plate 135 and the inner wall of the sealing cover 4. In this station, it is convenient to switch two of the three on / off rings 5 ​​to this third station, while the remaining on / off ring 5 is switched to the first or second station to detect whether there is a dangerous gas leak or the specific location of the dangerous gas leak.

[0046] In order to facilitate precise control of the angle of the switching ring 5, so that the switching ring 5 can be cyclically switched between the three workstations, in this invention, the two connecting holes 52 located on both sides of the switching hole 51 are equidistant from the switching hole 51.

[0047] In order to drive the on / off ring 5 to rotate, the on / off ring 5 includes a ring body 53 and flanges 54 with coaxial center lines fixed to the outer edges of the two ends of the ring body 53. The outer edges of the ring body 53 are integrally formed with a toothed ring 55 located between the flanges 54 at both ends. The rotating assembly 6 includes a drive unit 61 and a transmission gear 62. The transmission gear 62 meshes with the toothed ring 55 in a one-to-one correspondence. The drive unit 61 is driven to connect with the transmission gear 62.

[0048] Specifically, such as Figure 7 , Figure 8 , Figure 10 and Figure 12As shown, the flanges 54 at both ends of the ring body 53 in the switching ring 5 extend radially downwards along the inner and outer sides of the ring body 53, forming annular grooves on the inner and outer sides of the ring body 53. The gear ring 55 is fixed to the inner wall of the outer annular groove, thus creating a receiving space between the two switching rings 5. The three guide rings 134 are also provided with notches 1341, and the three transmission gears 62 are respectively positioned within the three notches 1341 and mesh with the corresponding three gear rings 55. With the above structure, the drive unit 61 acts on the transmission gears 62, causing the transmission gears 62 to rotate inside the notches 1341, acting on the gear rings 55, thereby causing the switching ring 5 to rotate around its own axis, changing the working position of the switching ring 5, and thus adjusting the position of the switching hole 51 and the connecting hole 52 on the switching ring 5 to meet different usage needs.

[0049] A further improvement is that the drive unit 61 includes: The drive gear 611 is coaxial with the transmission gear 62 and slides along its own axis on the side of the transmission gear 62 facing away from the sealing gasket 12. The drive gears 611 mesh with each other, and there is a plug shaft 6111 and a plug hole 621 that are inserted and engaged with the transmission gear 62 along the axis parallel to the pipe 11. The plug shaft 6111 and the plug hole 621 are offset from the axis of the drive gear 611. The drive motor 612 and the drive gear 613 are fixed inside the housing 22 and are driven by the drive gear 613. The drive gear 613 meshes with one of the driving gears 611. The elastic element 614 is connected to the drive gear 611 in a one-to-one correspondence, and is used to make the drive gear 611 tend to move away from the corresponding transmission gear 62 to separate the insert shaft 6111 and the insert hole 621. The pressing mechanism 615 is used to overcome the resistance of the elastic member 614 shown to push the drive gear 611 toward the transmission gear 62 to realize the insertion of the insert shaft 6111 and the insertion hole 621.

[0050] More specifically, such as Figures 9-14 As shown, in the rotating assembly 6, the side of the transmission gear 62 facing away from the sealing gasket 12 is fixedly connected to a concentric wheel 623 via a concentric shaft 622. The concentric wheel 623, the concentric shaft 622, the transmission gear 62, and the driving gear 611 are coaxial. The concentric wheel 623 has four through holes 621 arranged in a ring array along the axial direction of the concentric wheel 623. The driving gear 611 has a ring array of insert shafts 611 arranged near the concentric wheel 623 for corresponding insertion and engagement with the four insert holes 621.

[0051] A fixing frame 226 is fixedly connected to the inner wall of the outer casing 22; three drive gears 611 are provided, corresponding one-to-one with three on / off rings 5 ​​and meshing sequentially, and the drive gears 611 are distributed sequentially along the vertical direction; a drive bearing 6112 is provided on the side of the drive gear 611 opposite to the transmission gear 62, the outer ring of the drive bearing 6112 is fixedly connected to the coaxial center line of the drive gear 611, and the inner ring is fixedly connected to a slide rod 6141 extending along the axial direction of the pipe 11. The slide rod 6141 slides through the fixing frame 226 along its own axial direction, and a pressure plate 6142 is fixedly connected to the end of the slide rod 6141 away from the drive bearing 6112. The elastic element 614 is a compression spring, one end of which is connected to the fixing frame 226 and the other end of which is connected to the pressure plate 6142. The pressing mechanism 615 is provided on the side of the pressure plate 6142 away from the drive bearing 6112. The drive motor 612 is fixed on the mounting bracket 226 and the output end is coaxially connected to the drive gear 613. The drive gear 613 is located below the drive gear 611 and meshes with the bottom drive gear 611. Both the drive gear 611 and the drive gear 613 are long strips extending parallel to the axial direction of the pipe 11.

[0052] After adopting the above structure, the drive motor 612 runs and can drive the drive gear 613 to rotate, which in turn drives the three drive gears 611 above to rotate synchronously. The drive gear 611 in the middle rotates in the same direction as the drive gear 613, and in the opposite direction to the drive gears 611 at the bottom and top. The drive gears 611 and the drive gears 613 adopt the same specifications and dimensions to ensure that each drive gear 611 rotates at the same speed.

[0053] The pressing mechanism 615 can apply pressure to any one of the pressure plates 6142. When not subjected to the pressing action of the pressing mechanism 615, the pressure plate 6142, under the elastic force of the elastic element 614, exerts force in a direction away from the transmission gear 62, causing the insertion shaft 6111 on the drive gear 611 to disengage from the insertion hole 621 on the transmission gear 62, thus keeping the positions of the transmission gear 62 and the switching ring 5 relatively fixed. However, when the pressing mechanism 615 applies pressure to one of the pressure plates 6142, it can overcome the elastic force of the elastic element 614, causing the pressure plate 6142 to be squeezed. After the pressure of the pressing mechanism 615 is applied, it moves towards the transmission gear 62, and then drives the drive bearing 6112 and the drive gear 611 to move towards the transmission gear 62 through the slide rod 6141. This causes the insertion shaft 6111 on the drive gear 611 to be inserted into the insertion hole 621 on the transmission gear 62, thus achieving the docking of the drive gear 611 and the transmission gear 62. In this state, the rotation of the drive gear 611 can drive the transmission gear 62 to rotate synchronously, causing the gear ring 55 to rotate. This allows the switching ring 5 to rotate around its own axis, adjusting its own position to change the position of the switching hole 51 and the connecting hole 52.

[0054] A further improvement is that the extrusion mechanism 615 includes a translation unit and an extrusion member 6151. The output end of the translation unit is located inside the housing 22 and connected to the extrusion member 6151. The movement trajectory of the extrusion member 6151 is parallel to the distribution direction of the transmission gear 62.

[0055] With the above structure, the position of the extrusion member 6151 is adjusted by the translation unit so that the extrusion member 6151 contacts or separates from the pressure plate 6142. When the extrusion member 6151 is at the same height as a certain pressure plate 6142, the extrusion member 6151 can apply pressure to the pressure plate 6142 at the same height, and apply pressure to the pressure plate 6142 to overcome the elastic force of the elastic member 614, thereby pushing the slide rod 6141 and the drive gear 611 to move towards the transmission gear 62, so that the insertion shaft 6111 is inserted into the insertion hole 621, realizing the synchronous rotation of the transmission gear 62 and the drive gear 611.

[0056] A further improvement is that the extrusion component 6151 includes an extrusion roller that rotates around its own axis at the output end of the translation unit, and the axial direction of the extrusion roller is perpendicular to the distribution direction of the transmission gear 62 and the axial direction of the pipe 11.

[0057] After the extrusion member 6151 includes the extrusion roller, it extrudes the pressure plate 6142 by the extrusion roller, which can reduce the friction between the extrusion member 6151 and the pressure plate 6142 and facilitate the movement of the pressure plate 6142.

[0058] More specifically, such as Figures 9-11 As shown, the translation unit includes a translation motor 6152, a translation screw 6153, a translation sleeve 6154, a translation bearing 6155, and a translation guide rod 6156. The translation motor 6152 is fixed to the top of the outer casing 22 and is positioned downwards. The output end is coaxially connected to the translation screw 6153, which extends downwards in the vertical direction. The translation sleeve 6154 is threadedly connected to the translation screw 6153. The bottom end of the translation screw 6153 is fixedly connected to the inner ring of the translation bearing 6155. The outer ring of the translation bearing 6155 is fixed to the fixing frame 226. The translation guide rod 6156 extends in the vertical direction, and its two ends are respectively fixed between the fixing frame 226 and the inner wall of the outer casing 22. The translation sleeve 6154 is slidably sleeved on the outside of the translation guide rod 6156.

[0059] With the above structure, the translation motor 6152 starts and drives the translation screw 6153 to rotate stably around its own axis under the guidance of the translation bearing 6155. The translation guide rod 6156 in a fixed position guides the movement direction of the translation sleeve 6154, thereby changing the height position of the translation sleeve 6154 and the pressing member 6151. This causes the pressing member 6151 to act on the pressure plate 6142 corresponding to one of the driving gears 611, or to disengage from the pressure plate 6142 corresponding to each driving gear 611. This allows the driving gear 611 to be coaxially connected with the transmission gear 62, or for the driving gear 611 to disengage from the transmission gear 62.

[0060] A further improvement is that the sealing units are densely and evenly distributed between the flange 13 and the gasket 12, and the specifications and dimensions of each drive gear 611 are consistent, as are the specifications and dimensions of each transmission gear 62.

[0061] The above design facilitates precise control of the rotation angles of each transmission gear 62 and each drive gear 611, helps ensure that the insertion shaft 6111 and the insertion hole 621 are always on the same axis, and allows the insertion shaft 611 to be inserted into the insertion hole 621 under the action of the extrusion mechanism 615. This enables the drive gear 611 to dock with the transmission gear 62 through the movement of the drive gear 6111, and allows the transmission gear 62 to rotate synchronously with the rotation of the drive gear 6111, and precisely controls the rotation angle of the on / off ring 5.

[0062] The sealing units are densely and evenly distributed between the flange 13 and the gasket 12, which can reduce the gap between the sealing units and reduce the leakage of gas from adjacent sealing units, thereby improving the accuracy of detection and analysis. At the same time, it strengthens the sealing performance between the gasket 12 and the flange 13, ensuring that the sealing performance is consistent throughout.

[0063] A further improvement is that one end of the outer casing 22 is fixedly connected to the flange 13, and the other end is provided with an assembly through hole 224 for the pipe 11 to pass through. The assembly through hole 224 is coaxial with the pipe 11, and an elastic sealing ring 225 is sandwiched between the inner wall of the assembly through hole 224 and the circumferential outer edge of the pipe 11. The inner diameter of the assembly through hole 224 adjacent to the flange 13 is smaller than the inner diameter of the other end, and the assembly through hole 224 is gradually transitioned from one end to the other end.

[0064] Specifically, the sealing ring 225 is preferably one of fluororubber, perfluororubber, neoprene rubber, butyl rubber, or ethylene propylene rubber to ensure its elasticity and corrosion resistance. With the above structure, due to the action of the suction component 3, a negative pressure is formed inside the outer cavity. Under external atmospheric pressure, the sealing ring 225 is compressed, causing it to tend to move towards the sealing gasket 12. Since the inner diameter of the assembly through hole 224 adjacent to the flange 13 is smaller than the inner diameter of the other end, and the outer diameter of the pipe 11 is fixed... The diameter of the sealing ring 225 is smaller than the inner diameter of the mounting through hole 224, so that the annular space formed by the mounting through hole 224 and the pipe 11 moves towards the side of the flange 13 along the axial direction of the pipe 11, and the space size gradually decreases. This strengthens the compression of the sealing ring 225, thereby enhancing the sealing performance between the sealing ring 225 and the circumferential inner wall of the mounting through hole 224 and the pipe 11. This prevents dangerous gases leaking from the pipe 11 from entering the outer enclosure cavity and escaping from the gap between the outer shell 22 and the inner wall of the pipe 11, thus affecting the surrounding environment and detection accuracy.

[0065] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-parameter hazardous gas detection and analysis device, comprising a conveying assembly for conveying hazardous gases, the conveying assembly comprising two coaxial pipes and a sealing gasket disposed between the two pipes, a flange fixedly fitted onto the end of each pipe adjacent to the sealing gasket, and the sealing gasket being clamped between the corresponding flanges of the two pipes by a fastening unit; characterized in that: The sealing surfaces of the flange and the gasket are provided with sealing assemblies distributed radially along the flange. The sealing assemblies include sealing units arranged in a ring array with the flange axis as the center line. Each sealing unit includes a sealing protrusion and a sealing recess. The outer circumferential edge of the sealing protrusion is sealed and fitted with the inner circumferential wall of the sealing recess, and the sealing protrusion and the inner wall of the sealing recess enclose a leakage cavity. The flange is provided with leakage holes that correspond one-to-one with the leakage cavities. Also includes: The detection assembly is located on the side of the flange facing away from the gasket, and includes an inner shell and an outer shell. The outer shell, together with the flange and the pipe, forms an outer enclosing cavity. An external barometer and an external probe are disposed within the outer shell. The inner shell is disposed within the outer shell and contains an inner enclosing cavity. An internal barometer and an internal probe are disposed within the inner enclosing cavity. The inner shell and the outer shell are respectively fixedly connected to an internal exhaust pipe and an external exhaust pipe. The air extraction assembly includes a negative pressure pump, the input end of which is connected to the inner air extraction pipe and the outer air extraction pipe and is respectively connected to an inner valve and an outer valve, and the output end is used to connect to a buffer device. A switching device is used to connect and disconnect each air leakage hole from the inner surrounding cavity.

2. The multi-parameter hazardous gas detection and analysis device according to claim 1, characterized in that: The switching device includes: A sealing cover, together with the side of the flange facing away from the sealing gasket, forms a sealing cavity located outside the pipe. The sealing cover is also provided with an exhaust hole that corresponds one-to-one with the leakage hole and communicates with the inner enclosing cavity. A switching ring is radially distributed within the sealing cover and corresponds one-to-one with the sealing assembly. Its coaxial centerline is located outside the pipe. It is provided with a switching hole and multiple connecting holes, all of which are through holes with their axial directions parallel to the pipe axis. The connecting holes are arranged in a ring array on the switching ring and the number of them is equal to the leakage holes corresponding to the sealing assembly. The centerlines of the switching hole and the connecting holes are located on the same cylindrical surface. A rotating component drives the switching device to rotate around its own axis, such that each connecting hole is connected between a pair of vent holes and vent holes and both ends of the switching hole are closed, or both ends of each connecting hole are closed and the switching hole is connected between one of a pair of vent holes and vent holes, or both ends of each connecting hole and the switching hole are closed.

3. The multi-parameter hazardous gas detection and analysis device according to claim 2, characterized in that: The two connecting holes located on either side of the switching hole are equidistant from the switching hole.

4. The multi-parameter hazardous gas detection and analysis device according to claim 2, characterized in that: The switching ring includes a ring body and flanges fixed to the outer circumferential edges at both ends of the ring body with a coaxial center line. The outer circumferential edge of the ring body is integrally formed with a toothed ring located between the flanges at both ends. The rotating assembly includes a drive unit and a transmission gear. The transmission gear meshes with the toothed ring in a one-to-one correspondence. The drive unit is driven and connected to the transmission gear.

5. The multi-parameter hazardous gas detection and analysis device according to claim 4, characterized in that: The driving unit includes: The driving gear is coaxial with the transmission gear and slides along its own axis on the side of the transmission gear opposite to the sealing gasket. The driving gears mesh with each other and are provided with a plug shaft and a plug hole that are inserted and fitted along the axis of the pipe. The plug shaft and the plug hole are offset from the axis of the driving gear. A drive motor and a drive gear, wherein the drive motor is fixed inside the housing and is driven by the drive gear, and the drive gear meshes with one of the driving gears; The elastic element is connected to the driving gear in a one-to-one correspondence, and is used to make the driving gear tend to move away from the corresponding transmission gear to separate the insert shaft and the insertion hole; A pressing mechanism is used to overcome the resistance of the elastic element to push the drive gear toward the transmission gear to achieve the insertion of the insertion shaft and the insertion hole.

6. The multi-parameter hazardous gas detection and analysis device according to claim 5, characterized in that: The extrusion mechanism includes a translation unit and an extrusion component. The output end of the translation unit is located inside the outer casing and connected to the extrusion component. The movement trajectory of the extrusion component is parallel to the distribution direction of the transmission gears.

7. The multi-parameter hazardous gas detection and analysis device according to claim 6, characterized in that: The extrusion component includes an extrusion roller, which rotates around its own axis at the output end of the translation unit. The axial direction of the extrusion roller is perpendicular to the distribution direction of the transmission gear and the axial direction of the pipe.

8. The multi-parameter hazardous gas detection and analysis device according to claim 5, characterized in that: The sealing units are densely and evenly distributed between the flange and the gasket. The specifications and dimensions of each drive gear are consistent, and the specifications and dimensions of each transmission gear are consistent.

9. The multi-parameter hazardous gas detection and analysis device according to any one of claims 2-8, characterized in that: One end of the outer casing is fixedly connected to the flange, and the other end is provided with an assembly through hole for the pipe to pass through. The assembly through hole is coaxial with the pipe, and an elastic sealing ring is sandwiched between the inner wall of the assembly through hole and the circumferential outer edge of the pipe.

10. The multi-parameter hazardous gas detection and analysis device according to claim 9, characterized in that: The inner diameter of the assembly through hole at one end adjacent to the flange is smaller than the inner diameter at the other end, and the assembly through hole is gradually transitioned from one end to the other.

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