Anti-clogging volatile organic gas analyzer

Abstract

The application discloses a kind of anti-clogging volatile organic gas analyzers belonging to organic gas detection technical field.It includes installation cabinet, the detector is fixedly connected in the installation cabinet, the detector is fixedly connected with the diameter expansion mixing cylinder and detection cylinder that are communicated with each other, the detection module is installed on the detection cylinder, the detection module is installed on the detection cylinder in the detector, the diameter expansion mixing cylinder is provided with the wind guide base that is uniformly distributed in circumference, the wind guide base is rotatably connected with wind guide sheet.The part of airflow is made into spiral flow to detection cylinder by wind guide sheet and diameter expansion mixing cylinder cooperation, spiral airflow and straight-flow airflow are mixed by mutual impact, and then promote different concentrations of gas to mix with each other, compared with existing device, no longer rely on complex structure and static mixing device with many dead angles, promote gas to enter detection cylinder in uniform state, and also reduce the difficulty of backflushing cleaning diameter expansion mixing cylinder.

Description

Technical Field

[0001] This invention relates to the field of organic gas detection technology, and in particular to an anti-clogging volatile organic gas analyzer. Background Technology

[0002] Volatile organic gas (VOCs) analyzers are core equipment for monitoring chemical production processes. They play a crucial role in the research and development of emerging composite materials, especially in safety assessments during the production of these materials. The analyzer intermittently extracts gas samples from the reaction vessel using a built-in small gas pump. After filtration, the samples are sent to a high-precision sensor to analyze the concentration of organic gases. This allows for the detection of the concentration of harmful organic gases generated at different times during the material's production process, facilitating accurate assessment of the safety factor of the production process. Furthermore, abnormal data can provide early warnings and allow for production halts, reducing the probability of accidents. The detected gases are then uniformly treated and discharged through a purification system. However, because the concentration of organic gases within the reaction vessel is often uneven, the concentration of samples extracted by the analyzer typically fluctuates, making data processing challenging. To mitigate this issue, current technology allows the gas to flow through an expansion pipe before detection, reducing the flow rate. Subsequently, gases of different concentrations enter a static mixer (usually a porous pipe) to mix, reducing concentration fluctuations, improving data stability, and making the data more representative. Existing static mixers typically increase gas flow resistance through porous structures and generate numerous eddies to promote uniform mixing of gas samples. However, the porous structure and eddies can cause some sample gas to adhere to the inner wall of the porous structure within the static mixer, diluting the actual concentration of the sample gas. After a single test, a significant amount of time is required to clean the residual gas sample within the complex porous structure of the mixer. Incomplete cleaning can also cause the results of previous tests to interfere with the results of subsequent tests, affecting the accuracy of gas detection. Summary of the Invention

[0003] To overcome the shortcomings of existing detection devices, such as the complex structure of static mixers that not only dilutes the actual concentration of sample gas but also requires a significant amount of time to clean the residual gas sample inside the complex pore structure of the mixer after a single test, this invention provides an anti-clogging volatile organic gas analyzer.

[0004] The technical solution is as follows: A clog-resistant volatile organic gas analyzer includes a mounting cabinet. Inside the mounting cabinet are a detector, a solenoid four-way valve, a small air pump, a first solenoid three-way valve, and a first filter canister. The outlet of the small air pump, the solenoid four-way valve, the first solenoid three-way valve, and the first filter canister are sequentially connected. The detector, the solenoid four-way valve, and the inlet of the small air pump are sequentially connected. The detector is connected to a connector via a connecting pipe. A filter screen and a second solenoid three-way valve are installed inside the connector. An expanding-diameter mixing cylinder and a detection cylinder are fixedly connected and interconnected. A detection module located inside the detector is installed on the detection cylinder. A circumferentially evenly distributed air guide base is provided on one side of the expanding-diameter mixing cylinder near the detection cylinder. Air guide vanes are rotatably connected to the air guide bases. The air guide vanes guide the airflow in the expanding-diameter mixing cylinder to flow spirally into the detection cylinder. A power mechanism is provided on the detection cylinder to drive all the air guide vanes to rotate together.

[0005] As a further preferred embodiment, the expanding mixing cylinder consists of two gradient sections and one uniform section, with the uniform section located between the two gradient sections. The air guide base is located on the gradient section of the expanding mixing cylinder near the detection cylinder. The detection cylinder has a rounded rectangular cross-section. Symmetrically distributed air guides are rotatably connected to the side of the detection cylinder near the expanding mixing cylinder. The air guides are used to disperse the mixed airflow in the expanding mixing cylinder into the detection cylinder.

[0006] As a further preferred embodiment, the power mechanism includes a miniature electric push rod fixedly connected to the detection cylinder. A movable ring is fixedly connected to the telescopic end of the miniature electric push rod, and the movable ring is slidably connected to the detector. A winding spool is fixedly connected to the air guide vane, and the winding spool is located inside the air guide base and the two are rotatably connected. A torsion spring is installed between the two, and a pull rope is wound around the winding spool. The pull rope passes through the air guide base and is fixedly connected to the movable ring.

[0007] As a further preferred embodiment, the air guide is provided with a raised air guide surface, which is used to promote the horizontal diffusion of airflow.

[0008] As a further preferred embodiment, the air guide component has a recessed air guide surface on the side away from the raised air guide surface, and the recessed air guide surface is used to promote the diffusion of airflow towards the air guide component on the opposite side.

[0009] As a further preferred embodiment, the air guide is fixedly connected to a gear, the movable ring is fixedly connected to symmetrically distributed connecting columns, and the connecting columns are fixedly connected to racks that mesh with gears on adjacent air guides.

[0010] As a further preferred embodiment, the air guide vane is pyramidal in shape, and the air guide base is frustum-shaped.

[0011] As a further preferred embodiment, the detection cylinder is provided with a tapered section, and the detection module is located within the tapered section.

[0012] As a further preferred embodiment, the system also includes a drive mechanism for moving all the air guide bases together. The drive mechanism is disposed on the expanding mixing cylinder and includes a micro motor fixedly connected to the expanding mixing cylinder. The air guide bases are slidably connected to the expanding mixing cylinder, and the expanding mixing cylinder is rotatably connected to a rotating disk. The output shaft of the micro motor is driven to the rotating disk via a gear set. The rotating disk is provided with inclined grooves corresponding to the air guide bases one by one. Each air guide base is fixedly connected to a sliding column, which slides along adjacent inclined grooves.

[0013] As a further preferred embodiment, the electromagnetic four-way valve has an electromagnetic push rod and a valve core. The telescopic end of the electromagnetic push rod is fixedly connected to the valve core. The valve core is provided with a U-shaped flow channel and symmetrically distributed connecting flow channels. Both the U-shaped flow channel and the connecting flow channels are streamlined flow channels to reduce residues during gas flow. A second filter canister is fixedly connected inside the mounting cabinet. The connector is connected to the second filter canister through the second electromagnetic three-way valve.

[0014] This invention has the following advantages: By combining the air guide vanes and the expansion mixing cylinder, a portion of the airflow flows into the detection cylinder in a spiral shape. The spiral airflow and the direct airflow collide and mix with each other, thereby promoting the mixing of gases of different concentrations. Compared with existing devices, it no longer relies on static mixers with complex structures and many dead angles. While promoting the uniform entry of gas into the detection cylinder, it also reduces the difficulty of backflushing and cleaning the expansion mixing cylinder. During the backflushing and cleaning of the filter screen, the cleaning of the expansion mixing cylinder is completed simultaneously, reducing the probability of filter screen blockage and the probability of mutual interference between different batches of gas samples, thereby increasing the reliability of the data for detecting harmful organic gases.

[0015] This invention increases the range of gases that can be detected by setting the shape of the detection cylinder, thereby increasing the comprehensiveness of the detection data and reducing the probability of abnormal monitoring data. Furthermore, the convex and concave air guide surfaces of the air guide component guide the low-pressure and high-pressure airflows respectively, reducing the gas flow rate while promoting uniform diffusion of the airflow within the detection cylinder, further enhancing the stability of the gas detection process.

[0016] This invention guides the airflow through a guide base during backflushing cleaning of the expansion mixing cylinder, thereby increasing the probability of contact between the airflow and the inner wall of the expansion mixing cylinder. This makes it easier to clean the inner wall of the expansion mixing cylinder and reduces the possibility of mutual interference between experimental data from different batches. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a cross-sectional view of the mounting cabinet of the present invention;

[0019] Figure 3 This is a cross-sectional view of the detector and electromagnetic four-way valve of the present invention;

[0020] Figure 4 This is a three-dimensional structural diagram of the expanded diameter mixing cylinder and the detection cylinder of the present invention;

[0021] Figure 5 This is a cross-sectional view of the expanded-diameter mixing cylinder and the detection cylinder of the present invention;

[0022] Figure 6 This is a three-dimensional structural diagram of the air guide component of the present invention after rotation;

[0023] Figure 7 This is a three-dimensional structural diagram of the detection cylinder and miniature electric push rod of the present invention;

[0024] Figure 8 This is a cross-sectional view of the moving ring and rotating disk of the present invention;

[0025] Figure 9 This is a three-dimensional structural diagram of the spool of the present invention;

[0026] Figure 10 This is a cross-sectional view of the air guide base and air guide plate of the present invention;

[0027] Figure 11 This is a three-dimensional structural diagram of the air guide base after it has been moved according to the present invention;

[0028] Figure 12 This is a cross-sectional view of the connector of the present invention.

[0029] The components are: 1-installation cabinet, 2-detector, 21-expanding mixing cylinder, 22-detection cylinder, 222-recessed section, 23-detection module, 24-air guide base, 25-air guide plate, 251-winding spool, 252-pull rope, 26-air guide component, 261-protruding air guide surface, 262-recessed air guide surface, 27-miniature electric push rod, 271-moving ring, 272-connecting column, 28-miniature motor, 29-rotating disk, 291-inclined slide groove, 292-sliding column, 3-electromagnetic four-way valve, 31-electromagnetic push rod, 32-valve core, 301-U-shaped flow channel, 302-connecting flow channel, 4-small air pump, 5-first electromagnetic three-way valve, 51-first filter canister, 6-connector, 61-filter screen, 62-second electromagnetic three-way valve, 7-second filter canister. Detailed Implementation

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the shape, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0031] Example 1:

[0032] This embodiment discloses an anti-clogging volatile organic gas analyzer for detecting the concentration of volatile organic gases during chemical production processes.

[0033] Reference Figures 1-5 and Figure 12 The system includes an installation cabinet 1, which houses a detector 2, a solenoid four-way valve 3, a small air pump 4, a first solenoid three-way valve 5, and a first filter canister 51. The solenoid four-way valve 3, the small air pump 4, the first solenoid three-way valve 5, and the first filter canister 51 are all existing devices. The outlet of the small air pump 4, the solenoid four-way valve 3, the first solenoid three-way valve 5, and the first filter canister 51 are sequentially connected. The inlet of the detector 2, the solenoid four-way valve 3, and the small air pump 4 are sequentially connected. The first solenoid three-way valve 5 can be directly connected to the outside environment or to a clean gas source (e.g., a nitrogen storage tank). When the first solenoid three-way valve 5 is connected to the outside environment or a clean gas source, it is used to backflush and clean the expanded diameter mixing cylinder 21, the detection cylinder 22, and the filter screen 61 using clean gas. The detector 2 houses the interconnected expanded diameter mixing cylinder 21 and the detection cylinder 22. The expanded diameter mixing cylinder 21 on the detector 2 is connected to a connector 6 via a connecting pipe. The connector 6 contains the filter screen 61 and the second solenoid three-way valve 62 (see reference). Figure 2 and Figure 12The second electromagnetic three-way valve 62 adopts an existing device. The second electromagnetic three-way valve 62 is located on the side of the filter screen 61 away from the connecting pipe on the connector 6. The first electromagnetic three-way valve 5 and the second electromagnetic three-way valve 62 are both three-way electromagnetic valves used to switch the gas flow path. The second filter tank 7 is fixedly connected inside the mounting cabinet 1. The connector 6 is connected to the second filter tank 7 through the second electromagnetic three-way valve 62. The detection module 23 located inside the detector 2 is installed on the detection cylinder 22. The detection module 23 is an existing device (using the infrared spectroscopy detection principle or the tunable laser spectroscopy principle). The detection module 23 has two detection probes symmetrically distributed front and back. One detection probe is the transmitter and the other is the receiver. The two detection probes are used in pairs. Six circumferentially evenly distributed air guide bases 24 are set on the side of the expansion mixing cylinder 21 near the detection cylinder 22. The air guide bases 24 are rotatably connected to the air guide vanes 25 (refer to Figure 4 and Figure 5 The detection cylinder 22 is equipped with a power mechanism that drives all the air guide vanes 25 to rotate together.

[0034] Reference Figure 3 and Figure 4 The electromagnetic four-way valve 3 has an electromagnetic push rod 31 and a valve core 32. The telescopic end of the electromagnetic push rod 31 is fixedly connected to the valve core 32. The valve core 32 is provided with a U-shaped flow channel 301 and two symmetrically distributed connecting flow channels 302 (see reference). Figure 4 The U-shaped flow channel 301 is located in the middle of the two connected flow channels 302. Both the U-shaped flow channel 301 and the connected flow channel 302 are streamlined flow channels.

[0035] The above configuration enables the following: When the device draws gas from the reactor, the gas flows along the path of connector 6, expanding mixing cylinder 21, detection cylinder 22, U-shaped flow channel 301, small air pump 4, left connecting flow channel 302, first electromagnetic three-way valve 5, and first filter tank 51. When the device backflushes and cleans the expanding mixing cylinder 21, detection cylinder 22, and filter screen 61, the position of the extension end of electromagnetic push rod 31 and valve core 32 is adjusted to allow the gas to flow along the path of first electromagnetic three-way valve 5, U-shaped flow channel 301, small air pump 4, right connecting flow channel 302, detection cylinder 22, expanding mixing cylinder 21, filter screen 61, detection cylinder 22, and second filter tank 7. The air guide vane 25 is used to guide the gas flow close to the inside of the expanding mixing cylinder 21. The airflow on the inner wall flows spirally into the detection cylinder 22. During normal detection, the surface of the air guide 25 facing the adjacent air guide base 24 contacts the adjacent air guide base 24, and this side surface of the air guide 25 will not move to the position of contacting the airflow during the detection process. Compared with the existing static mixer, the structure of the air guide 25 in this solution is simpler. By guiding the gas close to the inner wall of the expansion mixing cylinder 21, the gas close to the inner wall of the expansion mixing cylinder 21 impacts the central direct flow gas along the spiral path, increasing the uniformity of gas concentration at different flow rates in different parts, while reducing the probability of sample gas stagnation when passing through vortex areas and complex structures, and increasing the accuracy of the detection module 23 in detecting harmful organic gas data.

[0036] Reference Figures 5-7 The expansion mixing cylinder 21 consists of two gradual sections and one uniform section, with the uniform section located between the two gradual sections. The air guide base 24 is located on the gradual section of the expansion mixing cylinder 21 near the detection cylinder 22. The detection cylinder 22 has a rounded rectangular cross-section. Two air guides 26 are rotatably connected to the side of the detection cylinder 22 near the expansion mixing cylinder 21. The air guides 26 are used to disperse the mixed airflow in the expansion mixing cylinder 21 into the detection cylinder 22.

[0037] Reference Figure 6 The air guide 26 is provided with a raised air guide surface 261, which is used to promote the diffusion of airflow in the horizontal direction.

[0038] The above setup achieves the following: the two detection probes of the detection module 23 are located on the front and rear sides of the detection cylinder 22, respectively. Without changing the flow area, this increases the probability of gas passing between the two detection probes, thereby increasing the effective detection area of ​​the detection module 23 within the detection cylinder 22 and making the detection data more representative. The initial state of the raised air guide surface 261 is as follows: Figure 7As shown, the raised air guide surface 261 is composed of multiple interconnected inclined surfaces with gradually changing inclination angles. The air guide component 26 guides the airflow from the expansion mixing cylinder 21 along the front-back direction inside the detection cylinder 22 and the opposite direction of the air guide component 26 through the raised air guide surface 261 on its left side, so as to promote the gas inside the detection cylinder 22 to return to a state of uniform rightward flow more quickly.

[0039] Reference Figures 4-10 The power mechanism includes a miniature electric push rod 27 fixedly attached to the detection cylinder 22. The miniature electric push rod 27 adopts an existing device, and a movable ring 271 is fixedly attached to the telescopic end of the miniature electric push rod 27 (see reference). Figure 4 and Figure 7 The moving ring 271 is coaxial with the expanding mixing cylinder 21, and the moving ring 271 is slidably connected to the detector 2. The air guide vane 25 is fixedly connected to the winding shaft 251 (see reference). Figure 9 The air guide base 24 consists of a guide portion located inside the expanding diameter mixing cylinder 21 and a sliding portion penetrating the expanding diameter mixing cylinder 21. The winding spool 251 is located inside the guide portion of the air guide base 24 and is rotatably connected to the air guide base 24 (see reference). Figure 10 A torsion spring is installed between the two, and a pull rope 252 is wound on the winding spool 251. The pull rope 252 can be a steel wire rope or other traction rope with wear-resistant and tensile strength. The pull rope 252 penetrates the guide part and sliding part of the air guide base 24 and is fixedly connected to the moving ring 271 (see reference). Figure 10 ).

[0040] The above setup can achieve the following: the miniature electric push rod 27 drives all the pull ropes 252 to move together through the moving ring 271, and the pull ropes 252 drag the adjacent winding shafts 251 to rotate, thereby causing the adjacent air guide vanes 25 to rotate.

[0041] Reference Figure 6 and Figure 7 The air guide 26 has a recessed air guide surface 262 on the side away from the raised air guide surface 261 (see reference). Figure 7 The recessed air guide surface 262 is used to promote the diffusion of airflow towards the air guide component 26 on the opposite side.

[0042] The above configuration enables the gas to be guided towards the opposite side of the detection cylinder 22 during gas detection when the concave air guide surface 262 is rotated to face the side of the expanded diameter mixing cylinder 21. For example, the concave air guide surface 262 located on the lower side guides the airflow towards the upper side of the detection cylinder 22. This promotes the mutual impact of gases in the detection cylinder 22 when the gas flow velocity in the detection cylinder 22 is high, increases the gas flow resistance in the detection cylinder 22, and thus slows down the gas flow velocity.

[0043] Reference Figure 7The air guide 26 is fixedly connected to a gear, and the moving ring 271 is fixedly connected to two symmetrically distributed connecting columns 272. The connecting columns 272 are fixedly connected to a rack that meshes with the gear on the adjacent air guide 26.

[0044] The above configuration enables the following: when the miniature electric push rod 27 drives the air guide plate 25 to rotate via the moving ring 271, the moving ring 271 simultaneously drives the adjacent air guide component 26 to rotate via the two connecting columns 272.

[0045] Reference Figures 8-10 The air guide plate 25 is a four-sided pyramid with a rhomboid bottom surface, and the air guide base 24 is a four-sided frustum.

[0046] The above settings can reduce the size of the eddy stagnation zone in the air guide vane 25 and air guide base 24 during the gas flow process, increase the smoothness of the gas flow through the air guide vane 25 and air guide base 24, and thus reduce the probability of sample gas adhering to the air guide vane 25 and air guide base 24 during the gas flow process.

[0047] Reference Figure 5 and Figure 6 The detection cylinder 22 is provided with a tapered section 222, and the detection module 23 is located inside the tapered section 222.

[0048] The above settings can achieve the following: by making the tapered section 222 form a flow channel with a cross-sectional area that gradually decreases from left to right, the gas flow is accelerated, and the gas guided by the air guide 26 is integrated into an airflow that flows to the right together, thereby improving the uniformity of the gas detected by the detection module 23.

[0049] The working principle of the above settings is as follows:

[0050] Testing process:

[0051] Start the small air pump 4. The small air pump 4 draws sample gas from the reactor through the electromagnetic four-way valve 3, detector 2 and connector 6. At the same time, start the first electromagnetic three-way valve 5 and the second electromagnetic three-way valve 62. The second electromagnetic three-way valve 62 connects the connector 6 to the reactor, and the first electromagnetic three-way valve 5 connects the electromagnetic four-way valve 3 to the first filter tank 51. At this time, the gas flow path is: reactor, connector 6, expansion mixing cylinder 21, detection cylinder 22, U-shaped flow channel 301, small air pump 4, left connecting flow channel 302, first electromagnetic three-way valve 5 to the first filter tank 51. The following description is based on the normal operating state with normal gas pressure (not exceeding 1MPa, and the gas pressure value is detected by the gas pressure detection module in the reactor, and this device does not need to be responsible for detection) and slow gas flow rate.

[0052] When the gas flows into the expanding mixing cylinder 21, the gas velocity decreases as the diameter of the expanding mixing cylinder 21 gradually increases. The gas mainly flows in two parts: one part flows horizontally to the right along the middle of the expanding mixing cylinder 21, and the other part flows gradually to the right along the inner wall of the expanding mixing cylinder 21. When the airflow flowing along the inner wall of the expanding mixing cylinder 21 comes into contact with the air guide base 24 and the air guide vane 25, the gas is guided by the air guide vane 25 and begins to flow obliquely to the right side of the inner wall of the expanding mixing cylinder 21. Because the direction of guidance of each air guide base 24 and air guide vane 25 to adjacent gases is not consistent, the gas flowing along the inner wall of the expanding mixing cylinder 21 eventually flows towards... When ejected to the right, the airflow is spiral-shaped, and the spiral airflow is guided by the gradual transition section on the right side of the expansion mixing cylinder 21 to gradually approach the center. The spiral airflow and the gas flowing horizontally to the right in the center collide and mix with each other, promoting the mixing of gases of different concentrations. In the above process, the extension end of the micro electric push rod 27 can be controlled to move back and forth left and right, thereby causing the moving ring 271 to repeatedly pull the pull rope 252 on it. The pull rope 252 drives the adjacent air guide vane 25 to rotate back and forth through the winding shaft 251 and the torsion spring on the winding shaft 251, thereby continuously adjusting the angle of the gas ejected along the inner wall of the expansion mixing cylinder 21, promoting the mixing of the two gases.

[0053] When gas flows into the detection cylinder 22 from the expansion mixing cylinder 21, the airflow located on the front and rear sides of the detection cylinder 22 diffuses autonomously to both sides, but most of the airflow is located in the middle and flows to the right. Subsequently, the middle airflow comes into contact with the raised air guide surfaces 261 of the two air guides 26. The middle airflow is guided by the raised air guide surfaces 261 to the front and rear sides and the opposite side of the air guide 26 (for example, the opposite side of the lower air guide 26 is the upper side). The amount of gas diverted to the front and rear sides of the air guide 26 is basically the same as the amount diverted to the opposite side. The airflow on the upper and lower sides flowing to the opposite side is mixed with the airflow in the middle. When the airflow converges and impacts each other, the airflow velocity in the middle is reduced, causing the airflow in the middle to diffuse to the front and rear sides of the detection cylinder 22. During the reciprocating movement of the moving ring 271, the moving ring 271 drives the two air guides 26 to swing back and forth synchronously through the two connecting columns 272. During the above process, the raised air guide surface 261 is always located on the left side of the air guide 26, guiding the gas and promoting the rapid and uniform diffusion of the airflow flowing from left to right in the detection cylinder 22, forming a fluid that flows uniformly to the right. When the gas flows between the detection modules 23, the detection modules 23 detect the concentration of harmful organic gases in the sample gas.

[0054] When the gas flows out of the detection cylinder 22, the gas flows along the above path to the first filter tank 51, and is discharged outdoors after being filtered and purified by the first filter tank 51.

[0055] When the gas pressure is high (greater than 1 MPa) and the gas flow speed is fast, the telescopic end of the micro electric push rod 27 is moved to the right. This causes the telescopic end of the micro electric push rod 27 to move the moving ring 271 and the two connecting columns 272 to the right together, pulling the pull rope 252 on it. The pull rope 252 drives the adjacent air guide vane 25 to rotate by dragging the winding shaft 251. The torsion spring on the winding shaft 251 torsion stores force. When the air guide 26 rotates 180°, the air guide vane 25 also rotates 180° (or an integer multiple of 180°). Because the air guide vane 25 is a four-sided pyramid with a rhomboid base, when the air guide 26 rotates 180°, so that its concave air guide surface 262 faces the expanding diameter mixing cylinder 21, the state of the air guide vane 25 is similar to its state before rotation (both are similar to...). Figure 8 (As shown in the same state), the working effect of the air guide 25 is not affected. When the concave air guide surface 262 faces the expansion mixing cylinder 21, the telescopic end of the micro electric push rod 27 still drives the moving ring 271 and the two connecting columns 272 to move back and forth, so that the air guide 26 guides the airflow in the expansion mixing cylinder 21 according to the above working principle. The concave air guide surface 262 is located on the left side of the air guide 26 and guides the gas. When the gas enters the detection cylinder 22 and contacts the air guide 26, the concave air guide surface 262 guides the adjacent gas to the inner wall of the detection cylinder 22 on the opposite side, increasing the intensity of the airflow on the upper and lower sides of the detection cylinder 22 impacting the airflow in the middle, thereby increasing the overall internal energy consumption of the airflow in the detection cylinder 22. At this time, the resistance of the airflow in the middle of the detection cylinder 22 is greater than the resistance of the airflow on the front and rear sides of the detection cylinder 22. The gas diffuses freely in the detection cylinder 22 to the front and rear sides, and the overall flow velocity of the gas in the detection cylinder 22 decreases, increasing the accuracy of the detection module 23 in detecting harmful organic gases.

[0056] Once a single sampling test is completed, the small air pump 4 stops extracting gas from the reactor and prepares for the backflushing process.

[0057] Recoil process:

[0058] After gas detection is completed, the control system switches the states of the four-way solenoid valve 3, the first three-way solenoid valve 5, and the second three-way solenoid valve 62. The electromagnetic push rod 31 on the four-way solenoid valve 3 retracts, and the extension end of the electromagnetic push rod 31 drives the valve core to move to the left. The first three-way solenoid valve 5 connects the four-way solenoid valve 3 to the outside air (or clean air source), and the second three-way solenoid valve 62 connects the connector 6 to the second filter tank 7. At this time, the gas flow path is: outside (or clean air source), first three-way solenoid valve 5, U-shaped flow channel 301, small air pump 4, right-side connecting flow channel 302, detection cylinder 22, and expansion diameter. The mixing cylinder 21 and connector 6 connect to the second filter tank 7. During the flow of outside air (or clean gas), the flow path is cleaned. At this time, the working principle described above can still be followed. By controlling the extension end of the micro electric push rod 27 to move back and forth, the moving ring 271 drives the adjacent air guide 25 to rotate back and forth through the pull rope 252 and the winding shaft 251. The moving ring 271 drives the two air guides 26 to swing back and forth through the two connecting columns 272, thereby increasing the cleaning effect of the air on the air guide 25 and the air guide 26 and reducing the probability of cross-contamination of sample gases during different detection processes.

[0059] After the backflush is completed, the first electromagnetic three-way valve 5 and the second electromagnetic three-way valve 62 are closed, and the extension and retraction ends of the electromagnetic push rod 31 and the miniature electric push rod 27 on the electromagnetic four-way valve 3 are controlled to drive the adjacent components to move and reset.

[0060] Example 2:

[0061] This embodiment discloses an anti-clogging volatile organic gas analyzer based on embodiment 1, which is used to increase the cleaning efficiency during the backflushing process. In the above embodiment, the air guide base 24 and the expansion mixing cylinder 21 are considered to be fixedly connected, while in this embodiment, the air guide base 24 and the expansion mixing cylinder 21 are slidably connected.

[0062] Reference Figure 8 , Figure 9 and Figure 11 It also includes a drive mechanism, which is set on the expansion mixing cylinder 21. The drive mechanism is used to drive all the air guide bases 24 to move together in the direction of the axis of the expansion mixing cylinder 21. The drive mechanism includes a micro motor 28 fixed to the expansion mixing cylinder 21. The micro motor 28 adopts an existing servo motor. The expansion mixing cylinder 21 is rotatably connected to a rotating disk 29. The output shaft of the micro motor 28 is driven by the rotating disk 29 through a gear set. The rotating disk 29 is provided with circumferentially evenly distributed inclined slide grooves 291, and the inclined slide grooves 291 correspond one-to-one with the air guide bases 24. The air guide bases 24 are fixed with sliding columns 292 that slide along the adjacent inclined slide grooves 291.

[0063] The above configuration enables the following: the guide portion of the air guide base 24 remains in contact with the inner wall of the expanded diameter mixing cylinder 21; the sliding portion of the air guide base 24 penetrates the expanded diameter mixing cylinder 21; and the two are connected in a sealed sliding connection. The sliding portion of the air guide base 24 is a quadrangular prism (see reference). Figure 8 and Figure 9 When the micro motor 28 drives the rotating disk 29 to rotate clockwise (from a left to right perspective), the sliding column 292 slides along the adjacent inclined slide groove 291. The rotating disk 29 drives all the air guide bases 24 to move towards the side closer to the axis of the expansion mixing cylinder 21 through the sliding column 292 and the inclined slide groove 291, thereby separating the guide part of the air guide base 24 from the expansion mixing cylinder 21. At this time, the backflowing airflow is guided by the air guide base 24 and flows to one side of the expansion mixing cylinder 21, which facilitates the airflow to quickly clean the inner wall of the expansion mixing cylinder 21. After the backflow cleaning is completed, the micro motor 28 drives the rotating disk 29 to rotate and reset, and the guide part of the air guide base 24 resets to a state of being in contact with the inner wall of the expansion mixing cylinder 21.

[0064] The technical principles of the embodiments of the present invention have been described above with reference to specific examples. These descriptions are merely for explaining the principles of the embodiments of the present invention and should not be construed as limiting the scope of protection of the embodiments of the present invention in any way. Based on the explanation herein, those skilled in the art can conceive of other specific embodiments of the present invention without creative effort, and these embodiments will all fall within the scope of protection of the embodiments of the present invention.

Claims

1. A kind of anti-clogging volatile organic gas analyzer, comprising installation cabinet (1), detector (2) is fixedly connected in the installation cabinet (1), electromagnetic four-way valve (3), small air pump (4), first electromagnetic three-way valve (5) and first filter tank (51), the air outlet of the small air pump (4), the electromagnetic four-way valve (3), the first electromagnetic three-way valve (5) and the first filter tank (51) are sequentially communicated, the detector (2), the electromagnetic four-way valve (3) and the air inlet of the small air pump (4) are sequentially communicated, the detector (2) is communicated with connecting head (6) by communication pipe, filter screen (61) and second electromagnetic three-way valve (62) are installed in connecting head (6), it is characterized by, The detector (2) is internally fixed with a diameter-expanded mixing cylinder (21) and a detection cylinder (22) in communication with each other, the detection cylinder (22) is internally provided with a detection module (23) located in the detector (2), the diameter-expanded mixing cylinder (21) is internally provided with a plurality of wind guide bases (24) uniformly distributed on the side close to the detection cylinder (22), the wind guide bases (24) are rotationally connected with wind guide blades (25), the wind guide blades (25) are used for guiding the airflow in the diameter-expanded mixing cylinder (21) to flow into the detection cylinder (22) in a spiral shape, and the detection cylinder (22) is provided with a power mechanism for driving all the wind guide blades (25) to rotate together. The diameter-expanded mixing cylinder (21) is composed of two gradient sections and a uniform section, and the uniform section is located between the two gradient sections, the wind guide bases (24) are located on the gradient section of the side of the diameter-expanded mixing cylinder (21) close to the detection cylinder (22), the cross section of the detection cylinder (22) is a rounded rectangle, and the detection cylinder (22) is rotationally connected with symmetrically distributed wind guide members (26) on the side close to the diameter-expanded mixing cylinder (21), and the wind guide members (26) are used for dispersing the mixed airflow in the diameter-expanded mixing cylinder (21) into the detection cylinder (22). The power mechanism comprises a micro electric push rod (27), the micro electric push rod (27) is fixedly connected to the detection cylinder (22), the telescopic end of the micro electric push rod (27) is fixedly connected with a moving ring (271), the moving ring (271) is slidably connected with the detector (2), the wind guide blades (25) are fixedly connected with a winding shaft (251), the winding shaft (251) is located in the wind guide base (24) and rotationally connected with the wind guide base (24), a torsional spring is arranged between the winding shaft (251) and the wind guide base (24), the winding shaft (251) is wound with a pull rope (252), the pull rope (252) penetrates through the wind guide base (24) and is fixedly connected with the moving ring (271). The wind guide member (26) is provided with a convex wind guide surface (261), and the convex wind guide surface (261) is used for promoting the airflow to diffuse horizontally. The side of the wind guide member (26) away from the convex wind guide surface (261) is provided with a concave wind guide surface (262), and the concave wind guide surface (262) is used for promoting the airflow to diffuse to the side of the wind guide member (26) in the opposite direction. The wind guide member (26) is fixedly connected with a gear, the moving ring (271) is fixedly connected with symmetrically distributed connecting columns (272), and the connecting columns (272) are fixedly connected with racks engaged with the gears on the adjacent wind guide members (26).

2. The anti-clogging volatile organic gas analyzer according to claim 1, characterized in that: The wind guide blades (25) are pyramid-shaped, and the wind guide bases (24) are prismatic.

3. The anti-clogging volatile organic gas analyzer according to claim 2, characterized in that: The detection cylinder (22) is provided with a tapered section (222), and the detection module (23) is located in the tapered section (222).

4. The anti-clogging volatile organic gas analyzer according to claim 3, characterized in that: Also include a drive mechanism for driving all the air guide base (24) together, the drive mechanism is provided on the diameter mixing cylinder (21), the drive mechanism includes a micro motor (28), the micro motor (28) is fixed on the diameter mixing cylinder (21), the air guide base (24) and the diameter mixing cylinder (21) sliding connection, the diameter mixing cylinder (21) is rotatably connected with rotating disc (29), the output shaft of the micro motor (28) and the rotating disc (29) are driven by gear set, the rotating disc (29) is provided with corresponding to the air guide base (24) one by one inclined sliding groove (291), the air guide base (24) is fixed with sliding column (292), the sliding column (292) along adjacent the inclined sliding groove (291) sliding.

5. The anti-clogging volatile organic gas analyzer according to claim 4, characterized in that: The electromagnetic four-way valve (3) has an electromagnetic push rod (31) and a valve core (32), the telescopic end of the electromagnetic push rod (31) is fixed with the valve core (32), the valve core (32) is provided with U-shaped flow channel (301) and symmetrically distributed communication flow channel (302), the U-shaped flow channel (301) and the communication flow channel (302) are streamline flow channel, for reducing the residual in the process of gas flow, the second filter tank (7) is fixed in the installation cabinet (1), the connecting head (6) is communicated with the second filter tank (7) through the second electromagnetic three-way valve (62).

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