Anti-blocking volatile organic gas analyzer

Abstract

The invention discloses an anti-blocking volatile organic gas analyzer, and belongs to the technical field of organic gas detection. Comprising a mounting cabinet, a detector is fixedly connected in the mounting cabinet, a diameter-expanding mixing cylinder and a detection cylinder which are communicated with each other are fixedly connected in the detector, a detection module is mounted on the detection cylinder, a detection module located in the detector is mounted on the detection cylinder, air guide bases which are uniformly distributed in the circumferential direction are arranged in the diameter-expanding mixing cylinder, and the air guide bases are connected with the detection module. And the air guide base is rotationally connected with an air guide sheet. Through cooperation of the air guide sheets and the expanding mixing cylinder, a part of air flow spirally flows into the detection cylinder, the spiral air flow and the direct-current air flow impact each other and are mixed, gas with different concentrations is further promoted to be mixed, and compared with an existing device, the device does not depend on a static flow mixer with a complex structure and multiple dead angles any more, and the detection efficiency is improved. The gas is promoted to enter the detection cylinder in a uniform state, and meanwhile, the difficulty of backflushing and cleaning the expanding mixing cylinder is also reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of organic gas detection, and particularly to an anti-blocking volatile organic gas analyzer. Background Art

[0002] A volatile organic gas (VOCs) analyzer is a core device for monitoring the chemical production process. It plays an important role in the research and development of emerging composite materials, especially in the safety assessment during the production process of emerging materials. The organic gas analyzer intermittently extracts gas samples from the reaction kettle through a built-in small air pump, and after filtration, sends them into a high-precision sensor to analyze the concentration of organic gases therein, detecting the concentration of harmful organic gases generated during different time periods in the production process of the material, facilitating the staff to accurately judge the safety factor of the material production process. And when necessary, the staff can obtain a warning in advance through abnormal data and suspend production to reduce the probability of accidents. The detected gas is uniformly introduced into the purification system for treatment and discharge. However, because the concentration of organic gases in the reaction kettle is often uneven, the concentration of the samples extracted by the organic gas analyzer usually fluctuates, resulting in a high processing difficulty for the detection data. To alleviate this problem, the prior art allows the gas to flow through an expansion pipe before detection, reducing the flow rate by expanding the pipe diameter. Subsequently, gases with different concentrations enter a static mixer (usually a porous structure pipe) to mix with each other to reduce gas concentration fluctuations and improve data stability, making the detection data more representative. The existing static mixer usually increases the flow resistance of the gas through a porous structure and creates a large number of vortices to promote the uniform mixing of gas samples. The porous structure and vortices easily cause some sample gases to adhere to the inner wall of the porous structure in the static mixer, resulting in the actual concentration of the sample gas being diluted. After a single detection, it takes a lot of time to clean the residual gas samples in the complex pore structure inside the mixer. If the cleaning is incomplete, the results of the previous detection will interfere with the results of subsequent detections, affecting the accuracy of gas detection. Summary of the Invention

[0003] In order to overcome the disadvantages of the existing detection device that the static mixer has a complex structure, which not only dilutes the actual concentration of the sample gas, but also requires a lot of time to clean the residual gas samples in the complex pore structure inside the mixer after a single detection, the present invention provides an anti-blocking volatile organic gas analyzer.

[0004] The technical solution is as follows: An anti-blocking volatile organic gas analyzer, which includes an installation cabinet. Inside the installation cabinet, a detector, an electromagnetic four-way valve, a small air pump, a first electromagnetic three-way valve, and a first filter tank are fixedly connected. The air outlet of the small air pump, the electromagnetic four-way valve, the first electromagnetic three-way valve, and the first filter tank are connected in sequence. The air inlets of the detector, the electromagnetic four-way valve, and the small air pump are connected in sequence. The detector is connected to a connector through a connecting pipe. A filter net and a second electromagnetic three-way valve are installed inside the connector. Inside the detector, an enlarged-diameter mixing cylinder and a detection cylinder that are interconnected are fixedly connected. A detection module located inside the detector is installed on the detection cylinder. On one side of the enlarged-diameter mixing cylinder close to the detection cylinder, wind guiding bases evenly distributed in the circumferential direction are arranged. The wind guiding bases are rotatably connected to wind guiding vanes. The wind guiding vanes are used to guide the airflow in the enlarged-diameter mixing cylinder to flow spirally into the detection cylinder. A power mechanism for driving all the wind guiding vanes to rotate together is arranged on the detection cylinder.

[0005] As a further preferred solution, the enlarged-diameter mixing cylinder is composed of two tapered sections and a uniform section, and the uniform section is located between the two tapered sections. The wind guiding bases are located on the tapered section of the enlarged-diameter mixing cylinder close to the detection cylinder. The cross-section of the detection cylinder is a rounded rectangle. On one side of the detection cylinder close to the enlarged-diameter mixing cylinder, symmetrically distributed wind guiding members are rotatably connected. The wind guiding members are used to disperse the mixed airflow in the enlarged-diameter mixing cylinder into the detection cylinder.

[0006] As a further preferred solution, the power mechanism includes a micro electric push rod. The micro electric push rod is fixedly connected to the detection cylinder. The telescopic end of the micro electric push rod is fixedly connected to a moving ring. The moving ring is slidably connected to the detector. The wind guiding vanes are fixedly connected to a winding shaft. The winding shaft is located inside the wind guiding base and is rotatably connected to the wind guiding base. A torsion spring is installed between the two. A pull rope is wound around the winding shaft. The pull rope penetrates the wind guiding base and is fixedly connected to the moving ring.

[0007] As a further preferred solution, the wind guiding member is provided with a convex wind guiding surface, and the convex wind guiding surface is used to promote the diffusion of the airflow in the horizontal direction.

[0008] As a further preferred solution, on the side of the wind guiding member away from the convex wind guiding surface, a concave wind guiding surface is provided, and the concave wind guiding surface is used to promote the diffusion of the airflow in the direction of the opposite wind guiding member.

[0009] As a further preferred solution, the wind guiding member is fixedly connected to a gear. The moving ring is fixedly connected to symmetrically distributed connecting columns. The connecting columns are fixedly connected to racks that mesh with the gears on the adjacent wind guiding members.

[0010] As a further preferred solution, the air guide piece is in a pyramid shape, and the air guide base is in a prism shape.

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

[0012] As a further preferred embodiment, it also includes a driving mechanism for driving all the air guide bases to move together, the driving mechanism is arranged on the expanded diameter mixing cylinder, the driving mechanism includes a micro motor, the micro motor is fixedly connected to the expanded diameter mixing cylinder, the air guide base is slidably connected to the expanded diameter mixing cylinder, the expanded diameter mixing cylinder is rotatably connected to a rotating disk, the output shaft of the micro motor and the rotating disk are driven by a gear set, the rotating disk is provided with inclined slide grooves corresponding to the air guide bases one by one, the air guide base is fixedly connected to a sliding column, and the sliding column slides along the adjacent inclined slide 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, and the valve core is provided with a U-shaped flow channel and a symmetrically distributed connecting flow channel, and the U-shaped flow channel and the connecting flow channel are both streamlined flow channels, which are used to reduce residues during gas flow. A second filter tank is fixedly connected in the installation cabinet, and the connecting head is connected to the second filter tank through the second electromagnetic three-way valve.

[0014] The present invention has the following advantages: the present invention cooperates with the air guide plate and the expanded diameter mixing cylinder to make a part of the airflow flow into the detection cylinder in a spiral shape, and the spiral airflow and the direct airflow impact and mix with each other, thereby promoting the mixing of gases of different concentrations. Compared with the existing device, it no longer relies on a static mixer with a complex structure and many dead angles, and promotes the gas to enter the detection cylinder in a uniform state. At the same time, it also reduces the difficulty of backflushing and cleaning the expanded diameter mixing cylinder. In the process of backflushing and cleaning the filter net, the cleaning of the expanded diameter mixing cylinder is completed simultaneously, reducing the probability of clogging of the filter net and the probability of mutual influence between gas samples of different batches, thereby increasing the reliability of the data for the detection of harmful organic gases.

[0015] The present invention increases the range of detected gas by setting the shape of the detection tube, thereby increasing the comprehensiveness of the detection data and reducing the probability of abnormal monitoring data. The raised air guide surface and the recessed air guide surface of the air guide member are used to guide the low-pressure airflow and the high-pressure airflow respectively, thereby reducing the gas flow rate and promoting the uniform diffusion of the airflow in the detection tube, thereby further improving the stability of the gas detection process.

[0016] When the present invention performs backflushing and cleaning in the diameter-expanding mixing cylinder, the air flow is guided by the air guide base, thereby increasing the contact probability between the air flow and the inner wall of the diameter-expanding mixing cylinder, which is more conducive to cleaning the inner wall of the diameter-expanding mixing cylinder and reducing the possibility of interference between experimental data of different batches. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a sectional view of the installation cabinet of the present invention; Figure 3 is a sectional view of the detector and the electromagnetic four-way valve of the present invention; Figure 4 is a three-dimensional structural schematic diagram of the diameter-expanding mixing cylinder and the detection cylinder of the present invention; Figure 5 is a sectional view of the diameter-expanding mixing cylinder and the detection cylinder of the present invention; Figure 6 is a three-dimensional structural schematic diagram of the air guide member after rotation of the present invention; Figure 7 is a three-dimensional structural schematic diagram of the detection cylinder and the micro electric push rod of the present invention; Figure 8 is a sectional view of the moving ring and the rotating disk of the present invention; Figure 9 is a three-dimensional structural schematic diagram of the wire reel of the present invention; Figure 10 is a sectional view of the air guide base and the air guide vane of the present invention; Figure 11 is a three-dimensional structural schematic diagram of the air guide base after movement of the present invention; Figure 12 is a sectional view of the connector of the present invention.

[0018] Wherein: 1-installation cabinet, 2-detector, 21-diameter-expanding mixing cylinder, 22-detection cylinder, 222-tapered section, 23-detection module, 24-air guide base, 25-air guide vane, 251-wire reel, 252-pulling rope, 26-air guide member, 261-protruding air guide surface, 262-recessed air guide surface, 27-micro electric push rod, 271-moving ring, 272-connecting column, 28-micro motor, 29-rotating disk, 291-inclined sliding 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 tank, 6-connector, 61-filter screen, 62-second electromagnetic three-way valve, 7-second filter tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] It should be noted that the illustrations provided in the following embodiments only schematically illustrate the basic concept of the present invention. Therefore, only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The shape, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the layout form of its components may also be more complex.

[0020] Embodiment 1: This embodiment discloses a clogging-proof volatile organic gas analyzer for detecting the concentration of volatile organic gases in the chemical production process.

[0021] Referring to Figures 1-5 and Figure 12 , it includes an installation cabinet 1, in which a detector 2, an electromagnetic four-way valve 3, a small air pump 4, a first electromagnetic three-way valve 5, and a first filter tank 51 are fixedly connected. Among them, the electromagnetic four-way valve 3, the small air pump 4, the first electromagnetic three-way valve 5, and the first filter tank 51 are all existing devices. 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 connected in sequence. The air inlets of the detector 2, the electromagnetic four-way valve 3, and the small air pump 4 are connected in sequence. The first electromagnetic three-way valve 5 can be directly connected to the outside or to a clean gas source (such as a nitrogen storage tank). When the first electromagnetic three-way valve 5 is connected to the outside or the clean gas source, it is used to backflush and clean the expanded mixing cylinder 21, the detection cylinder 22, and the filter screen 61 with clean gas. Inside the detector 2, an expanded mixing cylinder 21 and a detection cylinder 22 that are connected to each other are fixedly connected. The expanded mixing cylinder 21 on the detector 2 is connected to a connector 6 through a connecting pipe. Inside the connector 6, a filter screen 61 and a second electromagnetic three-way valve 62 are installed (referring to Figure 2 and Figure 12 ). The second electromagnetic three-way valve 62 is 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. Both the first electromagnetic three-way valve 5 and the second electromagnetic three-way valve 62 are three-way solenoid valves for switching the gas flow path. A second filter tank 7 is fixedly connected inside the installation cabinet 1. The connector 6 is connected to the second filter tank 7 through the second electromagnetic three-way valve 62. A 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 diode laser absorption spectroscopy principle). The detection module 23 has two detection probes symmetrically distributed front and back. One detection probe is the emission part, and one detection probe is the receiving part. The two detection probes are used in pairs. Six air guiding bases 24 evenly distributed in the circumferential direction are arranged on the side of the expanded mixing cylinder 21 close to the detection cylinder 22. The air guiding bases 24 are rotatably connected to air guiding vanes 25 (referring to Figure 4 and Figure 5 ). A power mechanism for driving all the air guiding vanes 25 to rotate together is arranged on the detection cylinder 22.

[0022] Referring toFigure 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 communication flow channels 302 symmetrically distributed on the left and right (refer to Figure 4 ), where the U-shaped flow channel 301 is located in the middle of the two communication flow channels 302, and both the U-shaped flow channel 301 and the communication flow channels 302 are streamlined flow channels.

[0023] The above settings can achieve: when the device extracts the gas flow in the reaction kettle, the gas flows along the path of the connector 6, the diameter-expanded mixing cylinder 21, the detection cylinder 22, the U-shaped flow channel 301, the small air pump 4, the left communication flow channel 302, the first electromagnetic three-way valve 5, and the first filter tank 51. When the device performs backwashing and cleaning of the diameter-expanded mixing cylinder 21, the detection cylinder 22, and the filter screen 61, the position of the telescopic end of the electromagnetic push rod 31 and the valve core 32 is adjusted to make the gas flow along the path of the first electromagnetic three-way valve 5, the U-shaped flow channel 301, the small air pump 4, the right communication flow channel 302, the detection cylinder 22, the diameter-expanded mixing cylinder 21, the filter screen 61, the detection cylinder 22, and the second filter tank 7. The air guide vane 25 is used to guide the air flow close to the inner wall of the diameter-expanded mixing cylinder 21 to flow spirally into the detection cylinder 22. During normal detection, the surface of the air guide vane 25 facing the adjacent air guide base 24 contacts the adjacent air guide base 24, and the surface of this side of the air guide vane 25 will not move to a position in contact with the air flow during the detection process. Compared with the existing static mixer, the structure of the air guide vane 25 in this solution is simpler. By guiding the gas close to the inner wall of the diameter-expanded mixing cylinder 21, the gas close to the inner wall of the diameter-expanded mixing cylinder 21 impacts the gas flowing directly in the middle along a spiral path, increasing the uniformity of the gas concentration at different parts with different flow rates. At the same time, it reduces the probability of the sample gas staying when passing through the eddy current area and complex structures, and increases the accuracy of the harmful organic gas data detected by the detection module 23.

[0024] Refer to Figures 5-7 , the diameter-expanded mixing cylinder 21 is composed of two gradual change sections and a uniform section, and the uniform section is located between the two gradual change sections. The air guide base 24 is located on the gradual change section 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. Two air guide members 26 symmetrically distributed up and down are rotatably connected to the side of the detection cylinder 22 close to the diameter-expanded mixing cylinder 21. The air guide members 26 are used to disperse the mixed air flow in the diameter-expanded mixing cylinder 21 into the detection cylinder 22.

[0025] Refer to Figure 6 , the air guide member 26 is provided with a convex air guide surface 261, and the convex air guide surface 261 is used to promote the diffusion of the air flow in the horizontal direction.

[0026] The above settings can achieve the following: The two detection probes of the detection module 23 are respectively located on the front and rear sides of the detection cylinder 22. Without changing the flow area, the probability of gas passing between the two detection probes is increased, thereby increasing the effective detection area of the detection module 23 in the detection cylinder 22 and making the detection data more representative. The initial state of the convex air guiding surface 261 is as Figure 7 shown. The convex air guiding surface 261 is composed of multiple inclined surfaces that are connected to each other and have gradually changing inclination angles. Through its left convex air guiding surface 261, the air guiding member 26 guides the air flow coming from the expanded diameter mixing cylinder 21 along the front and rear directions in the detection cylinder 22 and the direction opposite to the air guiding member 26, so as to promote the gas in the detection cylinder 22 to return to the state of flowing uniformly to the right faster.

[0027] Referring to Figures 4-10 , the power mechanism includes a micro electric push rod 27 fixedly connected to the detection cylinder 22. The micro electric push rod 27 adopts an existing device. The telescopic end of the micro electric push rod 27 is fixedly connected with a moving ring 271 (refer to Figure 4 and Figure 7 ). The moving ring 271 is coaxial with the expanded diameter mixing cylinder 21. The moving ring 271 is slidably connected to the detector 2. The air guiding vane 25 is fixedly connected with a wire winding shaft 251 (refer to Figure 9 ). The air guiding base 24 is composed of a guiding part located in the expanded diameter mixing cylinder 21 and a sliding part penetrating the expanded diameter mixing cylinder 21. The wire winding shaft 251 is located in the guiding part of the air guiding base 24. The wire winding shaft 251 is rotatably connected to the air guiding base 24 (refer to Figure 10 ), and a torsion spring is installed between the two. A pull rope 252 is wound around the wire winding shaft 251. The pull rope 252 can be a steel wire rope or other traction ropes with wear-resistant and tensile functions. The pull rope 252 penetrates the guiding part and the sliding part of the air guiding base 24 and is fixedly connected to the moving ring 271 (refer to Figure 10 ).

[0028] The above settings can achieve: The micro electric push rod 27 drives all the pull ropes 252 to move together through the moving ring 271. The pull ropes 252 drag the adjacent wire winding shafts 251 to rotate, thereby driving the adjacent air guiding vanes 25 to rotate.

[0029] Referring to Figure 6 and Figure 7 , on the side of the air guiding member 26 away from the convex air guiding surface 261, there is a concave air guiding surface 262 (refer to Figure 7 ). The concave air guiding surface 262 is used to promote the diffusion of the air flow towards the air guiding member 26 on the opposite side.

[0030] The above settings can achieve that when the concave air guiding surface 262 is rotated to face one side of the diameter-expanded mixing cylinder 21, during the gas detection process, the gas is guided by the concave air guiding surface 262 to the opposite side inside the detection cylinder 22 (for example, the concave air guiding surface 262 located on the lower side guides the air flow to the upper side inside the detection cylinder 22). Thus, when the gas flow velocity inside the detection cylinder 22 is relatively high, it promotes the mutual impact of the gas inside the detection cylinder 22, increases the gas flow resistance inside the detection cylinder 22, and then slows down the gas flow velocity.

[0031] Referring to Figure 7 , a gear is fixedly connected to the air guiding member 26, two connecting columns 272 symmetrically distributed up and down are fixedly connected to the moving ring 271, and racks meshing with the gears on the adjacent air guiding members 26 are fixedly connected to the connecting columns 272.

[0032] The above settings can achieve that when the micro electric push rod 27 drives the air guiding vane 25 to rotate through the moving ring 271, the moving ring 271 simultaneously drives the adjacent air guiding member 26 to rotate through the two connecting columns 272.

[0033] Referring to Figures 8-10 , the air guiding vane 25 is a quadrangular pyramid with a rhombus bottom surface, and the air guiding base 24 is a quadrangular frustum.

[0034] The above settings can achieve: reducing the size of the eddy current retention area during the process of guiding the gas flow by the air guiding vane 25 and the air guiding base 24, increasing the smoothness of the gas flowing through the air guiding vane 25 and the air guiding base 24, and then reducing the probability of the sample gas adhering to the air guiding vane 25 and the air guiding base 24 during the gas flow process.

[0035] Referring to Figure 5 and Figure 6 , a tapered section 222 is provided on the detection cylinder 22, and the detection module 23 is located inside the tapered section 222.

[0036] The above settings can achieve: by making the tapered section 222 form a flow channel with a gradually decreasing cross-sectional area from left to right, and then by accelerating the gas flow, promoting the gas guided by the air guiding member 26 to be integrated into an air flow flowing right together, and then improving the uniformity of the gas detected at the detection module 23.

[0037] The working principle of the above settings is: Detection process: Start the small air pump 4. The small air pump 4 extracts the sample gas in the reaction kettle through the electromagnetic four-way valve 3, the detector 2 and the 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 with the reaction kettle, and the first electromagnetic three-way valve 5 connects the electromagnetic four-way valve 3 with the first filter tank 51. At this time, the gas flow path is: reaction kettle, connector 6, diameter-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 to the first filter tank 51. The following takes the normal operation state with normal gas pressure (not exceeding 1 MPa, and the gas pressure value is detected by the air pressure detection module in the reaction kettle, and this device is not responsible for detection) and slow gas flow rate as an example for description.

[0038] When the gas flows into the diameter-expanding mixing cylinder 21, the gas flow rate decreases as the diameter of the diameter-expanding mixing cylinder 21 gradually expands. The gas mainly flows in two parts. One part flows horizontally to the right in the middle of the diameter-expanding mixing cylinder 21, and the other part flows gradually to the right along the inner wall of the diameter-expanding mixing cylinder 21. When the air flow flowing along the inner wall of the diameter-expanding mixing cylinder 21 contacts the air guide base 24 and the air guide vane 25, the gas is guided by the air guide vane 25 and starts to flow obliquely to the right along the inner wall of the diameter-expanding mixing cylinder 21. And because the guiding directions of each air guide base 24 and air guide vane 25 for the adjacent gas are all inconsistent, the gas flowing along the inner wall of the diameter-expanding mixing cylinder 21 is finally ejected to the right in a spiral shape. And the spiral air flow is guided by the gradual change section on the right side of the diameter-expanding mixing cylinder 21 and gradually approaches the middle. The spiral air flow impacts and mixes with the gas flowing horizontally to the right in the middle, promoting the mixing of gases with different concentrations. And in the above process, the reciprocating left and right movement of the telescopic end of the micro electric push rod 27 can be controlled, so that the moving ring 271 repeatedly pulls its upper pulling rope 252. The pulling rope 252 drives the adjacent air guide vane 25 to rotate reciprocally through the winding shaft 251 and the torsion spring on the winding shaft 251, and then continuously adjusts the ejection angle of the gas flowing along the inner wall of the diameter-expanding mixing cylinder 21, promoting the mixing of the two gases.

[0039] When the gas flows into the detection cylinder 22 from the diameter-expanding mixing cylinder 21, the airflows on the front and rear sides of the detection cylinder 22 spontaneously diffuse to both sides, but most of the airflows are located in the middle and flow to the right. Subsequently, the middle airflow contacts the convex air guiding surfaces 261 of the two air guiding members 26. The middle airflow is guided by the convex air guiding surfaces 261 and is shunted to the front and rear sides and the opposite side of the air guiding member 26 (for example, the opposite side of the lower air guiding member 26 is the upper side). Moreover, the amount of gas shunted to the front and rear sides of the air guiding member 26 is basically the same as the amount shunted to the opposite side. When the airflow flowing to the opposite side from the upper and lower sides impacts and converges with the middle airflow, the flow rate of the middle airflow is reduced, prompting the middle airflow to diffuse to the front and rear sides inside the detection cylinder 22. During the left-right reciprocating movement of the moving ring 271, the moving ring 271 drives the two air guiding members 26 to swing synchronously through the two connecting columns 272. During the above process, the convex air guiding surfaces 261 are always located on the left side of the air guiding members 26 to guide the gas, promoting the rapid and uniform diffusion of the airflow flowing from left to right inside the detection cylinder 22 to form a uniformly flowing fluid to the right. When the gas flows through between the detection modules 23, the detection modules 23 detect the concentration of harmful organic gases in the sample gas.

[0040] 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 filtered and purified by the first filter tank 51 and then discharged outdoors.

[0041] When the gas pressure is relatively high (greater than 1 MPa) and the gas flow rate is relatively fast, control the telescopic end of the micro electric push rod 27 to move to the right, so that the telescopic end of the micro electric push rod 27 drives the moving ring 271 and the two connecting columns 272 to move to the right together, and pulls the pull rope 252 thereon. The pull rope 252 drives the adjacent guide vane 25 to rotate by dragging the winding shaft 251, and the torsion spring on the winding shaft 251 twists and stores energy. When the air guiding member 26 rotates 180°, the guide vane 25 also rotates 180° (or an integer multiple of 180°). Because the guide vane 25 is a quadrangular pyramid with a rhombus bottom surface, when the air guiding member 26 rotates 180° to make its concave air guiding surface 262 face the diameter-expanding mixing cylinder 21, the state of the guide vane 25 is similar to the state before rotation (both are the same as Figure 8The working effect of the air guide vane 25 is not affected (the state shown is the same). When the concave air guide surface 262 faces the diameter-expanded 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 left and right reciprocally, so that the air guide member 26 guides the air flow in the diameter-expanded 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 member 26 to guide the gas. When the gas enters the detection cylinder 22 and contacts the air guide member 26, the concave air guide surface 262 guides the adjacent gas to the inner wall of the detection cylinder 22 on its opposite side, increasing the intensity of the air flow impact on the middle air flow on the upper and lower sides in the detection cylinder 22, thereby increasing the overall internal energy consumption of the air flow in the detection cylinder 22. At this time, the resistance of the air flow in the middle of the detection cylinder 22 is greater than the resistance of the air flow on the front and back sides of the detection cylinder 22, and the gas freely diffuses to the front and back sides in the detection cylinder 22, and the overall flow rate of the gas in the detection cylinder 22 decreases, increasing the accuracy of the detection module 23 for detecting harmful organic gases.

[0042] When a single sampling detection is completed, the small air pump 4 stops pumping the gas in the reaction kettle and prepares for the backwashing process.

[0043] Backwashing process: When the gas detection is completed, the electromagnetic four-way valve 3, the first electromagnetic three-way valve 5 and the second electromagnetic three-way valve 62 are controlled to switch states. The electromagnetic push rod 31 on the electromagnetic four-way valve 3 retracts, and the telescopic end of the electromagnetic push rod 31 drives the valve core to move to the left. The first electromagnetic three-way valve 5 connects the electromagnetic four-way valve 3 with the outside air (or clean gas source), and the second electromagnetic three-way valve 62 connects the connector 6 with the second filter tank 7. At this time, the gas flow path is: the outside (or clean gas source), the first electromagnetic three-way valve 5, the U-shaped flow path 301, the small air pump 4, the right-side connecting flow path 302, the detection cylinder 22, the diameter-expanded mixing cylinder 21, the connector 6 to the second filter tank 7. The outside air (or clean gas) cleans the flow path during the flow process. At this time, still according to the above working principle, by controlling the telescopic end of the micro electric push rod 27 to move left and right reciprocally, the moving ring 271 drives the adjacent air guide vanes 25 to rotate reciprocally through the pull rope 252 and the winding shaft 251, and the moving ring 271 drives the two air guide members 26 to swing reciprocally through the two connecting columns 272, thereby increasing the cleaning effect of the air on the air guide vanes 25 and the air guide members 26 and reducing the probability of cross-infection of the sample gas in different detection processes.

[0044] After the backwashing is completed, the first electromagnetic three-way valve 5 and the second electromagnetic three-way valve 62 are closed, and the telescopic ends of the electromagnetic push rod 31 on the electromagnetic four-way valve 3 and the telescopic end of the micro electric push rod 27 are controlled to drive the adjacent components to move back to their original positions.

[0045] Embodiment 2: This embodiment discloses an anti-clogging volatile organic gas analyzer based on Embodiment 1, which is used to increase the cleaning efficiency during the recoil process. In the above embodiment, the air guide base 24 and the expanded diameter mixing cylinder 21 are considered to be fixedly connected, while in this embodiment, the air guide base 24 and the expanded diameter mixing cylinder 21 are slidably connected.

[0046] Reference Figure 8 , Figure 9 and Figure 11 , and also includes a driving mechanism, which is arranged on the expanding mixing cylinder 21. The driving mechanism is used to drive all the air guide bases 24 to move together toward the axial direction of the expanding mixing cylinder 21. The driving mechanism includes a micro motor 28 fixedly connected to the expanding mixing cylinder 21. The micro motor 28 adopts an existing servo motor. The expanding mixing cylinder 21 is rotatably connected to a rotating disk 29. The output shaft of the micro motor 28 and the rotating disk 29 are driven by a gear set. The rotating disk 29 is provided with circumferentially uniformly distributed inclined slide grooves 291, and the inclined slide grooves 291 correspond to the air guide bases 24 one by one. The air guide bases 24 are fixedly connected with sliding columns 292 that slide along adjacent inclined slide grooves 291.

[0047] The above arrangement can achieve: the guide portion of the air guide base 24 is kept in contact with the inner wall of the diameter-enlarging mixing cylinder 21, the sliding portion of the air guide base 24 penetrates the diameter-enlarging mixing cylinder 21, and the two are sealed and slidably connected, and the sliding portion of the air guide base 24 is a quadrangular prism (refer to Figure 8 and Figure 9 ), when the micro motor 28 drives the rotating disk 29 to rotate clockwise (from left to right perspective), the sliding column 292 slides along the adjacent inclined slot 291, and the rotating disk 29 drives all the air guide bases 24 to move toward the side close to the axis of the expanded diameter mixing cylinder 21 through the sliding column 292 and the inclined slot 291, thereby separating the guide portion of the air guide base 24 from the expanded diameter mixing cylinder 21. At this time, the recoil airflow is guided by the air guide base 24 and flows to one side of the expanded diameter mixing cylinder 21, so that the airflow can quickly clean the inner wall of the expanded diameter mixing cylinder 21. When the recoil cleaning is completed, the micro motor 28 drives the rotating disk 29 to rotate and reset, and the guide portion of the air guide base 24 is reset to a state of being in contact with the inner wall of the expanded diameter mixing cylinder 21.

[0048] The technical principles of the embodiments of the present invention are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the embodiments of the present invention and cannot be interpreted in any way as limiting the protection scope of the embodiments of the present invention. Based on the explanations herein, those skilled in the art can think of other specific implementation methods of the embodiments of the present invention without creative work, and these methods will fall within the protection scope of the embodiments of the present invention.

Claims

1. A clogging-proof volatile organic gas analyzer, comprising an installation cabinet (1), wherein a detector (2), an electromagnetic four-way valve (3), a small air pump (4), a first electromagnetic three-way valve (5) and a first filter tank (51) are fixedly connected inside the installation cabinet (1), an 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, an air inlet of the detector (2), the electromagnetic four-way valve (3) and the small air pump (4) are sequentially communicated, the detector (2) is communicated with a connector (6) through a connecting pipe, a filter screen (61) and a second electromagnetic three-way valve (62) are installed inside the connector (6), and it is characterized in that, A diameter-expanding mixing cylinder (21) and a detection cylinder (22) which are interconnected are fixedly connected inside the detector (2). A detection module (23) located inside the detector (2) is installed on the detection cylinder (22). A wind guide base (24) with a circumferentially uniform distribution is arranged on one side of the diameter-expanding mixing cylinder (21) close to the detection cylinder (22). The wind guide base (24) is rotatably connected with a wind guide vane (25). The wind guide vane (25) is used for guiding the airflow in the diameter-expanding mixing cylinder (21) to flow into the detection cylinder (22) in a spiral shape. A power mechanism for driving all the wind guide vanes (25) to rotate together is arranged on the detection cylinder (22).

2. The anti-clogging volatile organic gas analyzer according to claim 1, wherein: The diameter-expanding mixing cylinder (21) is composed of two tapered sections and a uniform section, and the uniform section is located between the two tapered sections. The wind guide base (24) is located on the tapered section of the diameter-expanding mixing cylinder (21) close to the detection cylinder (22). The cross-section of the detection cylinder (22) is a rounded rectangle. Symmetrically distributed wind guide members (26) are rotatably connected to one side of the detection cylinder (22) close to the diameter-expanding mixing cylinder (21). The wind guide members (26) are used for dispersing the mixed airflow in the diameter-expanding mixing cylinder (21) into the detection cylinder (22).

3. The anti-clogging volatile organic gas analyzer according to claim 2, wherein: The power mechanism includes a micro electric push rod (27). The micro electric push rod (27) is fixedly connected to the detection cylinder (22). A moving ring (271) is fixedly connected to the telescopic end of the micro electric push rod (27). The moving ring (271) is slidably connected to the detector (2). A winding shaft (251) is fixedly connected to the wind guide vane (25). The winding shaft (251) is located inside the wind guide base (24) and the two are rotatably connected. A torsion spring is installed between the two. A pull rope (252) is wound around the winding shaft (251). The pull rope (252) penetrates the wind guide base (24) and is fixedly connected to the moving ring (271).

4. The anti-clogging volatile organic gas analyzer according to claim 3, characterized in that: The wind guide member (26) is provided with a convex wind guide surface (261). The convex wind guide surface (261) is used for promoting the diffusion of the airflow in the horizontal direction.

5. The anti-clogging volatile organic gas analyzer according to claim 4, wherein: A concave wind guide surface (262) is arranged on one side of the wind guide member (26) away from the convex wind guide surface (261). The concave wind guide surface (262) is used for promoting the diffusion of the airflow towards the wind guide member (26) on the opposite side.

6. The anti-blocking volatile organic gas analyzer according to claim 5, wherein: A gear is fixedly connected to the wind guide member (26). Symmetrically distributed connecting columns (272) are fixedly connected to the moving ring (271). A rack meshing with the gear on the adjacent wind guide member (26) is fixedly connected to the connecting column (272).

7. The anti-clogging volatile organic gas analyzer according to claim 3, wherein: The wind guide vane (25) is pyramid-shaped, and the wind guide base (24) is frustum-shaped.

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

9. The anti-clogging volatile organic gas analyzer according to claim 7, characterized in that: The invention also comprises a driving mechanism for driving all the air guide bases (24) to move together, the driving mechanism being arranged on the expanding diameter mixing cylinder (21), the driving mechanism comprising a micro motor (28), the micro motor (28) being fixedly connected to the expanding diameter mixing cylinder (21), the air guide base (24) being slidably connected to the expanding diameter mixing cylinder (21), the expanding diameter mixing cylinder (21) being rotatably connected to a rotating disk (29), the output shaft of the micro motor (28) and the rotating disk (29) being driven by a gear set, the rotating disk (29) being provided with inclined slide grooves (291) corresponding to the air guide bases (24) one by one, the air guide base (24) being fixedly connected to a sliding column (292), the sliding column (292) sliding along adjacent inclined slide grooves (291).

10. The anti-clogging volatile organic gas analyzer according to claim 1, characterized in that: The electromagnetic four-way valve (3) comprises 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); a U-shaped flow channel (301) and symmetrically distributed connecting flow channels (302) are provided on the valve core (32); the U-shaped flow channel (301) and the connecting flow channel (302) are both streamlined flow channels, and are used to reduce residues in the gas flow process; a second filter tank (7) is fixedly connected in the installation cabinet (1); and the connector (6) is connected to the second filter tank (7) via the second electromagnetic three-way valve (62).

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