VOCs pre-concentration device for air monitoring

Abstract

The invention relates to the technical field of VOCs pre-concentration, and provides a VOCs pre-concentration device for air monitoring, the VOCs pre-concentration device comprises a temperature control system, a connecting pipe penetrates through the side surface of the temperature control system, a reaction tank penetrates through one end, far away from the temperature control system, of the connecting pipe, and the bottom of the reaction tank is fixedly connected with a support frame; a condensing device is arranged on the side face of the temperature control system and comprises a motor, the motor is fixedly connected to the inner wall of the reaction tank, an output shaft of the motor is fixedly connected with a rotating rod, and the circumferential face of the rotating rod is fixedly connected with a condensing pipe. By means of the technical scheme, the problems that in the prior art, the effect of cleaning the bottom of the reaction tank is difficult to achieve, the inner surface of the reaction tank is difficult to keep clean, it is difficult to ensure that the VOCs concentration process is more efficient, and the effect of an adsorbent affected by moisture or pollutants is increased, so that the air monitoring precision is reduced are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of VOCs pre-concentration, and in particular to a VOCs pre-concentration device for air monitoring. Background Art

[0002] VOCs are a class of organic compounds that easily volatilize into the air at room temperature. They mainly come from human activities (such as industrial production, combustion processes, building materials, etc.) and natural plant and biological activities. Volatile organic compounds are often represented by VOCs, and total volatile organic compounds are sometimes represented by TVOC. VOCs (volatile organic compounds) are various organic compounds with boiling points of 50°C to 260°C at room temperature. In my country, VOCs refer to organic compounds with a saturated vapor pressure greater than 70Pa at room temperature and a boiling point below 260°C at normal pressure, or all organic compounds with a vapor pressure greater than or equal to 10Pa and volatility at 20°C. At present, the conventional treatment methods for VOCs mixed gas include adsorption, combustion (including thermal storage combustion and catalytic combustion), and biological treatment.

[0003] According to a publicly disclosed VOCs pre-concentration device for air monitoring (publication number: CN118500869B), it includes: a box, a sampling module for collecting air to be tested, a pre-concentration module for pre-concentrating VOCs gas in the air, an adjustment module for adjusting the height of the box, and a control module for identifying the distance between the box and the river surface and controlling the adjustment of the sampling height of the sampling module according to the distance; the sampling module includes: a sampling tube that can actively extend from the box, an air pump that can drive the sampling tube to extract air, a motor that can drive the sampling tube to rotate, and a connecting tube connecting the sampling tube and the pre-concentration module. However, the above-mentioned device cooperates with each other through components such as the box, the sampling module and the pre-concentration module, and it is difficult to achieve the effect of cleaning the bottom of the reaction tank, it is difficult to keep the inner surface of the reaction tank clean, it is difficult to ensure that the VOCs concentration process is more efficient, and the effect of moisture or pollutants affecting the adsorbent is increased, thereby reducing the accuracy of air monitoring, and needs to be improved. Summary of the invention

[0004] The present invention proposes a VOCs pre-concentration device for air monitoring, which solves the problems raised in the above documents.

[0005] The technical solution of the present invention is as follows: a VOCs pre-concentration device for air monitoring, comprising a temperature control system, a connecting pipe passing through the side of the temperature control system, a reaction tank passing through one end of the connecting pipe away from the temperature control system, and a support frame fixedly connected to the bottom of the reaction tank; A condensing device is arranged on the side of the temperature control system, and the condensing device includes a motor, and the motor is fixedly connected to the inner wall of the reaction tank, and the output shaft of the motor is fixedly connected to a rotating rod, and the circumferential surface of the rotating rod is fixedly connected to a condensing tube, and the circumferential surface of the rotating rod is rotatably connected to the rotating rod, and the circumferential surface of the rotating rod is fixedly connected to a cleaning roller, and the inner wall of the reaction tank is fixedly connected to a rack ring, and the circumferential surface of the rotating rod is fixedly connected to a gear, and the condensing device includes a cleaning structure.

[0006] The cleaning structure includes a fixed rod, the circumferential surface of the rotating rod is fixedly connected to the fixed rod, and one end of the fixed rod away from the rotating rod is fixedly connected to a scraper. The scraper and the cleaning roller can remove water droplets, oil stains, etc., reducing sample contamination caused by accumulation of pollutants.

[0007] The side surface of the gear meshes with the side surface of the rack ring, and the side surface of the scraper contacts the inner wall of the reaction tank. The design of the gear and the rack ring allows the cleaning roller to rotate on its own, thereby increasing the cleaning effect and keeping the inner surface of the reaction tank clean. This ensures that the VOCs concentration process is more efficient and reduces the effect of moisture or pollutants on the adsorbent, thereby improving the accuracy of air monitoring.

[0008] A filtering device is provided on the side of the temperature control system, and the filtering device includes a filter plate, and the filter plate is slidably connected to the inner wall of the reaction tank, a positioning rod is fixedly connected to the bottom of the filter plate, and a roller is rotatably connected to the bottom of the positioning rod, a filter disc is fixedly connected to the inner wall of the reaction tank, and a fixed block is fixedly connected to the top of the filter disc, a sliding groove is opened on the inner wall of the filter plate, and a sliding block is fixedly connected to the circumferential surface of the rotating rod.

[0009] The inner wall of the reaction tank is fixedly connected with a positioning plate, the bottom of the positioning plate is fixedly connected with a spring, and one end of the spring away from the positioning plate is fixedly connected to the top of the filter plate. The design of the spring can enable the filter plate to be continuously reset, reducing manual intervention.

[0010] The initial state of the spring is a relaxed state, the fixed block is located on the motion track of the roller, the number of the fixed blocks is set to be several, and they are arranged in a circular array on the top of the filter plate. The design of the fixed block can make the filter plate shake continuously, thereby preventing pollutants from accumulating on the surface of the filter plate.

[0011] A pressure relief device is provided on the top of the temperature control system, and the pressure relief device includes a baffle, which is slidably connected to the side of the reaction tank, and a protective shell is fixedly connected to the side of the baffle, and a telescopic rod is fixedly connected to the inner wall of the protective shell, and the telescopic end of the telescopic rod is fixedly connected to a mounting block.

[0012] A return spring is fixedly connected to the inner wall of the protective shell, and the end of the return spring away from the protective shell is fixedly connected to the side of the mounting block. Through the action of the return spring, the mounting block can automatically reset when the scraper is away, ensuring that the system can maintain a stable working state during reversal or forward rotation.

[0013] The initial state of the reset spring is a relaxed state. The number of the sliders is set to two and they are arranged in a circumferential array on the circumferential surface of the rotating rod. The design of the reset spring allows the filter plate to be reset continuously, reducing manual intervention.

[0014] The number of the positioning rods is set to be several, and they are arranged in a circular array at the bottom of the filter plate. The design of the positioning rods allows the filter plate to shake, which can reduce the frequency of cleaning or replacing the filter plate, reduce the risk of human operating errors, improve the stability of the equipment, and reduce possible damage caused by mechanical jamming or incorrect operation.

[0015] The working principle and beneficial effects of the present invention are: 1. In the present invention, the force of the rotating rod driven by the motor cooperates with the components such as the condensing tube, the fixed rod and the scraper in the condensing device, so that the gear is rotated by the rotation of the rotating rod, and the gear is meshed with the rack ring to rotate. The rotating rod is driven to rotate by the self-rotation of the gear, and the cleaning roller is driven to rotate by the self-rotation of the rotating rod, thereby achieving the effect of cleaning the bottom of the reaction tank and keeping the inner surface of the reaction tank clean, which can ensure that the VOCs concentration process is more efficient and reduce the effect of moisture or pollutants on the adsorbent, thereby improving the accuracy of air monitoring. Keeping the inner surface of the reaction tank clean can ensure that the VOCs concentration process is more efficient and reduce the effect of moisture or pollutants on the adsorbent, thereby improving the accuracy of air monitoring, and can effectively remove accumulated residues, prevent pollutants from excessively accumulating inside the equipment, and reduce the risk of equipment damage or leakage.

[0016] 2. In the present invention, the force of the slider being driven to rotate by the rotation of the rotating rod cooperates with the components such as the fixed block, the positioning plate and the slider in the filter device, so that when the roller is displaced to the side of the fixed block, the roller is squeezed to drive the positioning rod to move upward, and then the filter plate is driven to move upward through the positioning rod. When the roller is away from the fixed block, the filter plate is reset by the elastic force of the spring, so that the filter plate is continuously shaken to increase the filtering speed and prevent the filter plate from being blocked. By maintaining the vibration of the filter plate, the speed of airflow can be increased, which is helpful for the concentration and collection of VOCs substances, and can ensure that the sample airflow is not blocked, so that the VOCs components in the air can be smoothly concentrated through the filter plate and prevent the filter plate from being blocked. The stability of the system can be greatly improved, ensuring that the monitoring task can be carried out stably for a long time and reducing data gaps or errors caused by equipment failure.

[0017] 3. In the present invention, the force of driving the fixed rod and the scraper to rotate in the opposite direction by the reverse rotation of the rotating rod cooperates with the components such as the telescopic rod, the protective shell and the mounting block in the pressure relief device, so that the fixed rod and the scraper are driven to rotate in the opposite direction by the reverse rotation of the rotating rod, so that the scraper drives the mounting block to move, and the mounting block drives the protective shell to move, and then the displacement of the protective shell drives the baffle to move, so that the slot on the side of the reaction tank is opened to relieve the pressure of the reaction tank in advance, reduce pressure accumulation, prevent the accumulation of excessive pressure in the reaction tank, avoid equipment failure or danger, ensure safety, not only improve the stability of equipment operation, but also save human resources, reduce the risk of human operating errors, improve the stability of equipment, and reduce possible damage caused by mechanical jamming or incorrect operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] Figure 1 It is a schematic diagram of the three-dimensional appearance structure of the present invention; Figure 2 It is a schematic diagram of a three-dimensional half-section structure of the motor of the present invention; Figure 3 It is a schematic diagram of a three-dimensional half-section structure of the filter plate of the present invention; Figure 4 It is a three-dimensional enlarged structural schematic diagram of the spring of the present invention; Figure 5 It is a three-dimensional side view structural schematic diagram of the rack ring of the present invention; Figure 6 It is a three-dimensional side view structural schematic diagram of the fixing block of the present invention; Figure 7 It is a three-dimensional enlarged structural schematic diagram of the protective shell of the present invention; Figure 8 For the present invention Figure 5 Schematic diagram of the three-dimensional enlarged structure of A in the middle.

[0020] In the figure: 101, temperature control system; 102, reaction tank; 103, connecting pipe; 104, support frame; 2, condensing device; 201, motor; 202, rotating rod; 203, condensing tube; 204, fixing rod; 205, scraper; 206, rack ring; 207, rotating rod; 208, cleaning roller; 209, gear; 3, filtering device; 301, filter plate; 302, filter disc; 303, positioning rod; 304, roller; 305, fixing block; 306, spring; 307, positioning plate; 308, slide groove; 309, slider; 4, pressure relief device; 401, baffle; 402, protective shell; 403, telescopic rod; 404, reset spring; 405, mounting block. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1 like Figure 1 to Figure 8 As shown, this embodiment proposes a VOCs pre-concentration device for air monitoring, including a temperature control system 101, a connecting pipe 103 is passed through the side of the temperature control system 101, a reaction tank 102 is passed through the end of the connecting pipe 103 away from the temperature control system 101, and a support frame 104 is fixedly connected to the bottom of the reaction tank 102; A condensing device 2 is arranged on the side of the temperature control system 101, and the condensing device 2 includes a motor 201, and the motor 201 is fixedly connected to the inner wall of the reaction tank 102, and the output shaft of the motor 201 is fixedly connected to the rotating rod 202, and the circumferential surface of the rotating rod 202 is fixedly connected to the condensing tube 203, and the circumferential surface of the rotating rod 202 is rotatably connected to the rotating rod 207, and the circumferential surface of the rotating rod 207 is fixedly connected to the cleaning roller 208, the inner wall of the reaction tank 102 is fixedly connected to the rack ring 206, and the circumferential surface of the rotating rod 207 is fixedly connected to the gear 209, and the condensing device 2 includes a cleaning structure.

[0023] The cleaning structure includes a fixed rod 204, the circumferential surface of the rotating rod 202 is fixedly connected to the fixed rod 204, and the end of the fixed rod 204 away from the rotating rod 202 is fixedly connected to a scraper 205. The scraper 205 and the cleaning roller 208 can remove water droplets, oil stains, etc., reducing sample contamination caused by accumulation of pollutants.

[0024] The side of the gear 209 meshes with the side of the rack ring 206, and the side of the scraper 205 contacts the inner wall of the reaction tank 102. The design of the gear 209 and the rack ring 206 allows the cleaning roller 208 to rotate on its own, thereby increasing the cleaning effect and keeping the inner surface of the reaction tank 102 clean. This ensures that the VOCs concentration process is more efficient, reduces the effect of moisture or pollutants on the adsorbent, and thus improves the accuracy of air monitoring.

[0025] A filter device 3 is provided on the side of the temperature control system 101, and the filter device 3 includes a filter plate 301, and the filter plate 301 is slidably connected to the inner wall of the reaction tank 102, and a positioning rod 303 is fixedly connected to the bottom of the filter plate 301, and a roller 304 is rotatably connected to the bottom of the positioning rod 303, and a filter disc 302 is fixedly connected to the inner wall of the reaction tank 102, and a fixed block 305 is fixedly connected to the top of the filter disc 302, and a slide groove 308 is opened on the inner wall of the filter plate 301, and a slider 309 is fixedly connected to the circumferential surface of the rotating rod 202.

[0026] The inner wall of the reaction tank 102 is fixedly connected with a positioning plate 307, the bottom of the positioning plate 307 is fixedly connected with a spring 306, and one end of the spring 306 away from the positioning plate 307 is fixedly connected to the top of the filter plate 301. The design of the spring 306 can make the filter plate 301 continuously reset, reducing manual intervention.

[0027] The initial state of the spring 306 is a relaxed state. The fixed block 305 is located on the motion track of the roller 304. The number of the fixed blocks 305 is set to be several, and they are arranged in a circular array on the top of the filter disc 302. The design of the fixed block 305 can make the filter plate 301 shake continuously, thereby preventing pollutants from accumulating on the surface of the filter plate 301.

[0028] In this embodiment, the present application drives the rotating rod 202 to rotate through the motor 201, and then drives the condenser 203 to rotate through the rotating rod 202, drives the rotating rod 207 to rotate through the rotating rod 202, and then drives the cleaning roller 208 to rotate through the rotating rod 207, and drives the gear 209 to rotate through the rotating rod 207, so that the gear 209 and the rack ring 206 are meshed and rotated, and the rotating rod 207 is driven to rotate by the self-rotation of the gear 209, and then the cleaning roller 208 is driven to rotate by the self-rotation of the rotating rod 207, so as to realize the bottom of the reaction tank 102. The scraper 205 is designed to scrape off the water droplets on the inner wall of the reaction tank 102, keep the inner surface of the reaction tank 102 clean, ensure that the VOCs concentration process is more efficient, reduce the effect of moisture or pollutants on the adsorbent, thereby improving the accuracy of air monitoring, and effectively remove accumulated residues, prevent pollutants from excessively accumulating inside the equipment, and reduce the risk of equipment damage or leakage.

[0029] The slider 309 is rotated by rotating the rotating rod 202, and the filter plate 301 is rotated by rotating the slider 309. The filter plate 301 is rotated by rotating the positioning rod 303, and the roller 304 is rotated by the positioning rod 303. When the roller 304 moves to the side of the fixed block 305, the roller 304 is squeezed to drive the positioning rod 303 to move upward, and the filter plate 301 is moved upward by the positioning rod 303. When the roller 304 is away from the fixed block 305, the filter plate 301 is moved by the spring 30 The elastic reset of 6 realizes the effect of continuous shaking of the filter plate 301 to increase the filtering speed and prevent the filter plate 301 from being blocked. By maintaining the vibration of the filter plate 301, the speed of the airflow can be increased, which is helpful for the concentration and collection of VOCs substances. It can ensure that the sample airflow is not blocked, and that the VOCs components in the air can be smoothly concentrated through the filter plate 301, preventing the filter plate 301 from being blocked, which can greatly improve the stability of the system, ensure that the monitoring task can be carried out stably for a long time, and reduce data gaps or errors caused by equipment failures.

[0030] Example 2 like Figure 1 to Figure 8 As shown, based on the same concept as the above-mentioned embodiment 1, a second embodiment is also proposed, a pressure relief device 4 is arranged on the top of the temperature control system 101, the pressure relief device 4 includes a baffle 401, the baffle 401 is slidably connected to the side of the reaction tank 102, the side of the baffle 401 is fixedly connected to a protective shell 402, the inner wall of the protective shell 402 is fixedly connected to a telescopic rod 403, and the telescopic end of the telescopic rod 403 is fixedly connected to a mounting block 405.

[0031] A return spring 404 is fixedly connected to the inner wall of the protective shell 402, and one end of the return spring 404 away from the protective shell 402 is fixedly connected to the side of the mounting block 405. Through the action of the return spring 404, the mounting block 405 can automatically reset when the scraper 205 is away, ensuring that the system can maintain a stable working state during the reverse or forward rotation process.

[0032] The initial state of the reset spring 404 is a relaxed state. The number of the sliders 309 is set to two and arranged in a circumferential array on the circumferential surface of the rotating rod 202. The design of the reset spring 404 allows the filter plate 301 to be reset continuously, reducing manual intervention.

[0033] The number of positioning rods 303 is set to be several, and they are arranged in a circular array at the bottom of the filter plate 301. The design of the positioning rods 303 allows the filter plate 301 to shake, which can reduce the frequency of cleaning or replacing the filter plate 301, reduce the risk of human operating errors, improve the stability of the equipment, and reduce possible damage caused by mechanical jamming or incorrect operation.

[0034] In this embodiment, when condensation is completed, the motor 201 is driven in the reverse direction, so that the motor 201 drives the rotating rod 202 to rotate in the reverse direction, and the rotating rod 202 rotates in the reverse direction to drive the fixed rod 204 and the scraper 205 to rotate in the reverse direction, so that the scraper 205 drives the mounting block 405 to move, and the mounting block 405 drives the protective shell 402 to move, and then the displacement of the protective shell 402 drives the baffle 401 to move, so that the slot on the side of the reaction tank 102 is opened to relieve the pressure of the reaction tank 102 in advance, and when the motor 201 rotates forward, the scraper 205 moves The inclined surface of the mounting block 405 will be squeezed, causing the mounting block 405 to move toward the inside of the protective shell 402, so the baffle 401 cannot be opened. When the scraper 205 is away from the mounting block 405, the mounting block 405 is reset by the elastic force of the reset spring 404, thereby reducing pressure accumulation, preventing the accumulation of excessive pressure in the reaction tank 102, avoiding equipment failure or danger, and ensuring safety. This not only improves the stability of equipment operation, but also saves human resources, reduces the risk of human operating errors, improves the stability of the equipment, and reduces possible damage caused by mechanical jamming or incorrect operation.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A VOCs pre-concentration device for air monitoring, characterized in that: It comprises a temperature control system (101), a connecting pipe (103) passing through a side of the temperature control system (101), a reaction tank (102) passing through an end of the connecting pipe (103) away from the temperature control system (101), and a supporting frame (104) fixedly connected to the bottom of the reaction tank (102); A condensing device (2) is arranged on the side of the temperature control system (101), and the condensing device (2) comprises a motor (201), the motor (201) is fixedly connected to the inner wall of the reaction tank (102), the output shaft of the motor (201) is fixedly connected to a rotating rod (202), the circumferential surface of the rotating rod (202) is fixedly connected to a condensing tube (203), the circumferential surface of the rotating rod (202) is rotatably connected to a rotating rod (207), the circumferential surface of the rotating rod (207) is fixedly connected to a cleaning roller (208), the inner wall of the reaction tank (102) is fixedly connected to a rack ring (206), the circumferential surface of the rotating rod (207) is fixedly connected to a gear (209), and the condensing device (2) comprises a cleaning structure.

2. A VOCs pre-concentration device for air monitoring according to claim 1, characterized in that: The cleaning structure comprises a fixed rod (204), the circumferential surface of the rotating rod (202) is fixedly connected to the fixed rod (204), and one end of the fixed rod (204) away from the rotating rod (202) is fixedly connected to a scraper (205).

3. A VOCs pre-concentration device for air monitoring according to claim 2, characterized in that: The side surface of the gear (209) meshes with the side surface of the rack ring (206), and the side surface of the scraper (205) contacts the inner wall of the reaction tank (102).

4. A VOCs pre-concentration device for air monitoring according to claim 3, characterized in that: A filtering device (3) is arranged on the side of the temperature control system (101), the filtering device (3) comprising a filtering plate (301), the filtering plate (301) being slidably connected to the inner wall of the reaction tank (102), a positioning rod (303) being fixedly connected to the bottom of the filtering plate (301), a roller (304) being rotatably connected to the bottom of the positioning rod (303), a filtering disc (302) being fixedly connected to the inner wall of the reaction tank (102), a fixing block (305) being fixedly connected to the top of the filtering disc (302), a sliding groove (308) being provided on the inner wall of the filtering plate (301), and a sliding block (309) being fixedly connected to the circumferential surface of the rotating rod (202).

5. A VOCs pre-concentration device for air monitoring according to claim 4, characterized in that: A positioning plate (307) is fixedly connected to the inner wall of the reaction tank (102), a spring (306) is fixedly connected to the bottom of the positioning plate (307), and one end of the spring (306) away from the positioning plate (307) is fixedly connected to the top of the filter plate (301).

6. A VOCs pre-concentration device for air monitoring according to claim 5, characterized in that: The initial state of the spring (306) is a relaxed state, the fixing block (305) is located on the movement track of the roller (304), the number of the fixing blocks (305) is set to be a plurality, and they are arranged in a circular array on the top of the filter disc (302).

7. A VOCs pre-concentration device for air monitoring according to claim 6, characterized in that: A pressure relief device (4) is provided on the top of the temperature control system (101), and the pressure relief device (4) comprises a baffle (401), the baffle (401) is slidably connected to the side of the reaction tank (102), a protective shell (402) is fixedly connected to the side of the baffle (401), a telescopic rod (403) is fixedly connected to the inner wall of the protective shell (402), and a mounting block (405) is fixedly connected to the telescopic end of the telescopic rod (403).

8. A VOCs pre-concentration device for air monitoring according to claim 7, characterized in that: A return spring (404) is fixedly connected to the inner wall of the protective shell (402), and one end of the return spring (404) away from the protective shell (402) is fixedly connected to the side surface of the mounting block (405).

9. A VOCs pre-concentration device for air monitoring according to claim 8, characterized in that: The initial state of the return spring (404) is a relaxed state, and the number of the sliders (309) is set to two, and arranged in a circumferential array on the circumferential surface of the rotating rod (202).

10. A VOCs pre-concentration device for air monitoring according to claim 9, characterized in that: The number of the positioning rods (303) is set to be a plurality and arranged in a circumferential array at the bottom of the filter plate (301).

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