Active sampling equipment for persistent organic pollutants PAHs in atmosphere

Abstract

The invention discloses active sampling equipment for persistent organic pollutants PAHs in atmosphere, and relates to the technical field of atmosphere sampling equipment.The active sampling equipment comprises a hollow base plate, a filter screen replacing mechanism is arranged outside the hollow base plate and comprises a first motor arranged outside the hollow base plate, and a first transmission rod is arranged at the output end of the first motor; the side, away from the first motor, of the first transmission rod is fixedly connected with a disc, the upper portion of the disc is fixedly connected with a protruding rod, the side edge of the protruding rod is provided with a four-arc-shaped plate, the upper portion of the four-arc-shaped plate is fixedly connected with a connecting rod, the side, away from the four-arc-shaped plate, of the connecting rod is fixedly connected with a four-rod rotating disc, and the side edge of the four-rod rotating disc is provided with a first filter screen. The second filter screen can be automatically followed and replaced, the continuity and high efficiency of the sampling process are maintained, the problem that the sampling efficiency is reduced due to blockage of the filter screens in traditional sampling equipment is solved, and the reliability and stability of sampling operation are improved.

Description

Technical Field

[0001] The invention relates to the technical field of atmospheric sampling equipment, and in particular to an active sampling equipment for persistent organic pollutants PAHs in the atmosphere. Background Art

[0002] PAHs are a class of persistent organic pollutants widely present in the atmosphere. The Minjiang River Basin has also been polluted by PAHs to varying degrees. The distribution of PAHs in the atmosphere of the Minjiang River Basin may be affected by a variety of factors, including seasonal changes, meteorological conditions, human activities, etc. The pollution characteristics of PAHs in the atmosphere of the Minjiang River Basin are complex and diverse, and the sources are extensive and complex. In order to effectively deal with this problem, it is necessary to take comprehensive measures to strengthen monitoring, source control, regional joint prevention and control, and public publicity and education. Active sampling equipment for persistent organic pollutants in the atmosphere, PAHs, mainly involves the field of environmental protection, especially the sampling of persistent organic pollutants in the atmosphere.

[0003] After searching, the invention patent with Chinese patent number CN105445061 B discloses an active sampling system for persistent organic pollutants PAHs in the atmosphere, including a sampling system, a flow monitoring system and a power system; the sampling system includes an SPE extraction column tube and a filter arranged above the SPE extraction column tube, and the filter is fixed to the rubber plug at the upper end of the SPE extraction column tube through a conversion joint; the SPE extraction column tube is connected to the flow monitoring system through the conversion joint and the rubber tube at its lower end, and the flow monitoring system is connected to the power system through the rubber tube; the SPE extraction column tube is filled with XAD-2 resin, the XAD-2 resin is sealed in the space formed by two Teflon gaskets, and polyurethane foam is filled between the XAD-2 resin and the Teflon gasket.

[0004] However, in actual use, the above device filters particulate matter and impurities in the atmosphere through a filter. Due to the different contents of particulate matter and impurities in different atmospheric environments, if the content is high or the use time is too long, the filter is easily clogged. The sampling environment is in the atmosphere, and it is extremely difficult to clean the filter, resulting in a decrease in sampling efficiency. Therefore, an active sampling device for persistent organic pollutants PAHs in the atmosphere is proposed. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that particulate matter and impurities in the atmosphere are filtered through a filter. Since the content of particulate matter and impurities in different atmospheric environments is different, if the content is high or the use time is too long, the filter is easily clogged, and the sampling environment is in the atmosphere, it is extremely difficult to clean the filter, resulting in a decrease in sampling efficiency. An active sampling device for persistent organic pollutants PAHs in the atmosphere is proposed to solve the problem.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An active sampling device for persistent organic pollutants PAHs in the atmosphere, comprising a hollow substrate, a filter replacement mechanism is arranged outside the hollow substrate, the filter replacement mechanism comprises a first motor arranged outside the hollow substrate, a first transmission rod is arranged at the output end of the first motor, a disc is fixedly connected to the first transmission rod at a side away from the first motor, a convex rod is fixedly connected above the disc, a four-arc plate is arranged on the side of the convex rod, a connecting rod is fixedly connected above the four-arc plate, a four-rod rotating disk is fixedly connected to the connecting rod at a side away from the four-arc plate, a first filter is arranged on the side of the four-rod rotating disk, and the first motor is operated to change the first filter from a static state to a moving state;

[0008] A sampling cylinder is arranged below the hollow substrate, and an active sampling mechanism for collecting organic pollutants PAHs is arranged inside the sampling cylinder. The active sampling mechanism includes a second motor arranged inside the sampling cylinder, and a second transmission rod is arranged at the output end of the second motor. A power fan is fixedly connected to a side of the second transmission rod away from the second motor, and the operation of the second motor causes the power fan to change from a static state to a rotating state.

[0009] The above technical solution further includes:

[0010] The hollow base plate is fixedly connected to the first motor, a slide groove is provided inside the four-arc plate, the convex rod can slide inside the slide groove, and the connecting rod is rotationally connected to the hollow base plate.

[0011] A circular plate is arranged on one side of the circular disc close to the first transmission rod, and the circular plate fits closely with the four-arc plate and ensures the stability of the slideway when it rotates.

[0012] A second filter is arranged on the side of the first filter, a first spring is fixedly connected inside the side of the hollow substrate, a curved plate is fixedly connected to the side of the first spring away from the hollow substrate, and the curved plate fits the second filter.

[0013] A storage cylinder is arranged below the hollow base plate close to the second filter screen, and a second spring is fixedly connected to the bottom of the storage cylinder.

[0014] The inner wall of the sampling cylinder is fixedly connected to a chassis, the second motor is fixedly installed inside the chassis, and the power fan is rotationally connected to the sampling cylinder.

[0015] An adsorption component is fixedly installed on the inner wall of the sampling cylinder, and the adsorption component is used for secondary filtering of the sampled gas.

[0016] A transmission tube is fixedly connected to the bottom of the sampling tube, and a SPE extraction column tube is fixedly connected to the side of the transmission tube away from the sampling tube. The SPE extraction column tube is used to filter the sampled gas three times.

[0017] The side of the SPE extraction column tube is fixedly connected with a gas storage cylinder, and the gas storage cylinder is used to collect and store the gas after sampling and filtration.

[0018] The top of the gas storage cylinder is fixedly connected with a waste storage box, and the waste storage box is fixedly connected to the hollow base plate.

[0019] The present invention has the following beneficial effects:

[0020] 1. In the present invention, when the first filter is clogged due to long-term use or a high particulate matter content environment, the first motor drives the first transmission rod and the disc to rotate, thereby driving the convex rod to slide in the slide groove of the four-arc plate, prompting the four-arc plate and the connecting rod to move in conjunction, and finally realizing automatic replacement of the first filter through the four-rod turntable. At the same time, the elastic potential energy design of the first spring and the second spring ensures that the second filter can be automatically replaced, maintaining the continuity and efficiency of the sampling process. This mechanism effectively avoids the problem of decreased sampling efficiency caused by filter blockage in traditional sampling equipment, and improves the reliability and stability of the sampling operation.

[0021] 2. In the present invention, a multi-level filtration system including a first filter, an adsorption component and an SPE extraction column is provided. The first filter serves as a primary filter to effectively remove particulate matter and impurities in the atmosphere. The adsorption component further performs secondary filtration on the gas to improve the purity of the sample. The SPE extraction column utilizes the powerful adsorption capacity of the XAD-2 resin to specifically and efficiently capture persistent organic pollutants PAHs. This multi-level filtration design not only ensures the accuracy and reliability of the sampling results, but also improves the detection sensitivity of pollutants such as PAHs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of an active sampling device for persistent organic pollutants PAHs in the atmosphere proposed by the present invention;

[0023] Figure 2 It is a schematic diagram of the external structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the first three-dimensional structure of the present invention;

[0025] Figure 4 It is a schematic diagram of a second three-dimensional structure in the present invention;

[0026] Figure 5 is a schematic diagram of a third three-dimensional structure in the present invention;

[0027] Figure 6 for Figure 1 A schematic diagram of the structure enlargement in the middle;

[0028] Figure 7 for Figure 4 Enlarged schematic diagram of the structure at point B in the middle.

[0029] In the figure: 1. hollow substrate; 2. first motor; 3. first transmission rod; 4. disc; 5. convex rod; 6. four-arc plate; 7. slide groove; 8. circular ring plate; 9. connecting rod; 10. four-rod turntable; 11. first filter; 12. second filter; 13. first spring; 14. arc plate; 15. storage cylinder; 16. second spring; 17. sampling cylinder; 18. chassis; 19. second motor; 20. second transmission rod; 21. power fan; 22. adsorption component; 23. transmission tube; 24. SPE extraction column tube; 25. gas storage cylinder; 26. waste storage box. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in 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.

[0031] Embodiment 1

[0032] like Figure 1-Figure 7 As shown, an active sampling device for persistent organic pollutants PAHs in the atmosphere proposed by the present invention comprises a hollow substrate 1, characterized in that a filter replacement mechanism is arranged outside the hollow substrate 1, the filter replacement mechanism comprises a first motor 2 arranged outside the hollow substrate 1, a first transmission rod 3 is arranged at the output end of the first motor 2, a disc 4 is fixedly connected to the side of the first transmission rod 3 away from the first motor 2, a convex rod 5 is fixedly connected above the disc 4, a four-arc plate 6 is arranged on the side of the convex rod 5, a connecting rod 9 is fixedly connected above the four-arc plate 6, a four-rod rotating disk 10 is fixedly connected to the side of the connecting rod 9 away from the four-arc plate 6, a first filter 11 is arranged on the side of the four-rod rotating disk 10, and the operation of the first motor 2 causes the first filter 11 to change from a static state to a moving state;

[0033] A sampling cylinder 17 is arranged below the hollow substrate 1, and an active sampling mechanism for collecting organic pollutants PAHs is arranged inside the sampling cylinder 17. The active sampling mechanism includes a second motor 19 arranged inside the sampling cylinder 17, and a second transmission rod 20 is arranged at the output end of the second motor 19. A power fan 21 is fixedly connected to the side of the second transmission rod 20 away from the second motor 19. The operation of the second motor 19 causes the power fan 21 to change from a static state to a rotating state;

[0034] The hollow base plate 1 is fixedly connected to the first motor 2, a slide groove 7 is provided inside the four-arc plate 6, the protruding rod 5 can slide inside the slide groove 7, and the connecting rod 9 is rotatably connected to the hollow base plate 1;

[0035] A second filter screen 12 is disposed on the side of the first filter screen 11, a first spring 13 is fixedly connected to the inside of the side of the hollow substrate 1, and a curved plate 14 is fixedly connected to the side of the first spring 13 away from the hollow substrate 1, and the curved plate 14 fits the second filter screen 12;

[0036] A storage cylinder 15 is disposed below the hollow substrate 1 near the second filter screen 12, and a second spring 16 is fixedly connected to the bottom of the storage cylinder 15;

[0037] An adsorption assembly 22 is fixedly mounted on the inner wall of the sampling cylinder 17, and the adsorption assembly 22 is used for secondary filtration of the sampled gas;

[0038] A transmission tube 23 is fixedly connected to the bottom of the sampling cylinder 17, and a SPE extraction column tube 24 is fixedly connected to the side of the transmission tube 23 away from the sampling cylinder 17. The SPE extraction column tube 24 is used to filter the sampled gas three times;

[0039] A gas storage cylinder 25 is fixedly connected to the side of the SPE extraction column tube 24, and the gas storage cylinder 25 is used to collect and store the gas after sampling and filtration.

[0040] In this embodiment, the filter replacement mechanism provided on the outside of the hollow substrate 1 is started, and the first motor 2 in the filter replacement mechanism starts to run. The first motor 2 is fixedly installed on the outside of the hollow substrate 1. When the first motor 2 runs, it starts to control the first transmission rod 3 provided at its output end to rotate. When the first transmission rod 3 rotates, it drives the disc 4 fixedly connected to the other side to start rotating. A convex rod 5 is fixedly connected above the disc 4. When the disc 4 rotates, it drives the convex rod 5 to start to move in a circular manner. When the convex rod 5 moves, it starts to move toward the inside of the four-arc plate 6. The four-arc plate 6 moves inside the slide groove 7, and four corresponding groups of slide grooves 7 are opened inside the four-arc plate 6. When the convex rod 5 slides inside the slide groove 7, it will drive the four-arc plate 6 to rotate. When the convex rod 5 moves to the inner wall vertex of the slide groove 7, the four-arc plate 6 rotates to one-eighth at this time, and the movement of the convex rod 5 gradually begins to disengage from the slide groove 7 until the convex rod 5 disengages from the slide groove 7. At this time, the four-arc plate 6 rotates a quarter, so that the four-arc plate 6 will drive the connecting rod 9 arranged above it to rotate a quarter, and the connecting rod 9 passes through the hollow base plate 1 when rotating. The interior of the hollow base plate 1 drives the four-bar turntable 10 to start rotating. A quarter rotation of the four-bar turntable 10 will cause the first filter screen 11, which is restricted by the two rods of the four-bar turntable 10, to start moving. A quarter rotation just moves the first filter screen 11 to the other side of the hollow base plate 1, and at this time, the first spring 13 fixedly connected inside the hollow base plate 1 begins to use elastic potential energy to drive the second filter screen 12, and the arc plate 14 fitted between the first spring 13 and the second filter screen 12 drives the second filter screen 12 to move, and the second filter screen 12 moves with the first spring 13. The first filter 11 moves with the movement of the first filter 11. When the four-rod turntable 10 stops moving, the second filter 12 will enter the two rods of the four-rod turntable 10 to complete the filter replacement operation. In addition, multiple groups of second filter 12 are arranged inside the storage cylinder 15. When a group of second filter 12 moves away, the second spring 16 fixedly connected to the bottom of the storage cylinder 15 uses elastic potential energy to move another group of second filter 12 to the inside of the hollow substrate 1, so as to facilitate the next filter replacement operation, thereby ensuring that the filter blockage affecting the sampling work will not occur.

[0041] A sampling cylinder 17 is fixedly connected below the hollow substrate 1, and an active sampling mechanism arranged inside the sampling cylinder 17 is started, and a second motor 19 in the active sampling mechanism starts to run. When the second motor 19 runs, it starts to control a second transmission rod 20 arranged at its output end to rotate. When the second transmission rod 20 rotates, it drives a power fan 21 fixedly connected to the other side thereof to start rotating. The power fan 21 starts to rotate inside the sampling cylinder 17 and generates a large amount of suction, so that the gas in the atmosphere is sucked into the sampling cylinder 17. Before being sucked into the sampling cylinder 17, particulate matter and impurities are filtered out through the first filter 11. After preliminary filtration, the gas enters the interior of the SPE extraction column tube 24 through the transmission tube 23 fixedly connected to the outside of the sampling tube 17, and the interior is filled with XAD-first motor 2 resin. This resin has a strong adsorption capacity for persistent organic pollutants and can effectively adsorb pollutants such as PAHs in the atmosphere on the resin. The XAD-first motor 2 resin is sealed in the space formed by two Teflon gaskets, and polyurethane foam is filled between the Teflon gaskets to ensure the stability of the resin and the sampling efficiency. The exhaust gas that is finally filtered is transmitted to the inside of the gas storage cylinder 25 for storage to facilitate subsequent safe discharge.

[0042] Embodiment 2

[0043] like Figure 1-Figure 7 As shown, based on the first embodiment, a circular plate 8 is provided on one side of the disc 4 close to the first transmission rod 3, and the circular plate 8 fits with the four-arc plate 6 and ensures the stability of the chute 7 when rotating;

[0044] The inner wall of the sampling cylinder 17 is fixedly connected to the chassis 18, the second motor 19 is fixedly installed inside the chassis 18, and the power fan 21 is rotatably connected to the sampling cylinder 17;

[0045] A waste storage box 26 is fixedly connected to the top of the gas storage cylinder 25 , and the waste storage box 26 is fixedly connected to the hollow substrate 1 .

[0046] In this embodiment, a chassis 18 is fixedly connected to the inner wall of the sampling cylinder 17, and a second motor 19 is fixedly installed inside the chassis 18, so that the second motor 19 can stably operate inside the sampling cylinder 17, and an adsorption component 22 is fixedly installed on the inner wall of the sampling cylinder 17. The adsorption component 22 is used to perform a second filtration on the atmospheric gas entering the sampling cylinder 17 to ensure that no particulate matter and impurities enter the subsequent filtration steps. A waste storage box 26 is fixedly connected under the hollow substrate 1, and the first filter 11 that has been filtered and replaced enters the waste storage box 26 for storage to facilitate subsequent processing.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An active sampling device for persistent organic pollutants (PAHs) in the atmosphere, comprising a hollow substrate (1), characterized in that: A filter replacement mechanism is arranged outside the hollow substrate (1), and the filter replacement mechanism comprises a first motor (2) arranged outside the hollow substrate (1); a first transmission rod (3) is arranged at the output end of the first motor (2); a disc (4) is fixedly connected to the side of the first transmission rod (3) away from the first motor (2); a convex rod (5) is fixedly connected above the disc (4); a four-arc plate (6) is arranged on the side of the convex rod (5); a connecting rod (9) is fixedly connected above the four-arc plate (6); a four-rod rotating disk (10) is fixedly connected to the side of the connecting rod (9) away from the four-arc plate (6); a first filter (11) is arranged on the side of the four-rod rotating disk (10); the first motor (2) operates so that the first filter (11) changes from a static state to a moving state; A sampling cylinder (17) is arranged below the hollow substrate (1), and an active sampling mechanism for collecting organic pollutants PAHs is arranged inside the sampling cylinder (17). The active sampling mechanism comprises a second motor (19) arranged inside the sampling cylinder (17), a second transmission rod (20) is arranged at the output end of the second motor (19), and a power fan (21) is fixedly connected to a side of the second transmission rod (20) away from the second motor (19), and the operation of the second motor (19) causes the power fan (21) to change from a static state to a rotating state.

2. The active sampling device for persistent organic pollutants PAHs in the atmosphere according to claim 1, characterized in that: The hollow base plate (1) is fixedly connected to the first motor (2), a slide groove (7) is provided inside the four-arc plate (6), the protruding rod (5) can slide inside the slide groove (7), and the connecting rod (9) is rotationally connected to the hollow base plate (1).

3. The active sampling device for persistent organic pollutants PAHs in the atmosphere according to claim 1, characterized in that: A circular plate (8) is provided on one side of the circular disc (4) close to the first transmission rod (3); the circular plate (8) fits closely to the four-arc plate (6) and ensures the stability of the slide groove (7) during rotation.

4. The active sampling device for persistent organic pollutants PAHs in the atmosphere according to claim 1, characterized in that: A second filter screen (12) is arranged on the side of the first filter screen (11); a first spring (13) is fixedly connected inside the side of the hollow substrate (1); a curved plate (14) is fixedly connected to the side of the first spring (13) away from the hollow substrate (1); and the curved plate (14) is fitted with the second filter screen (12).

5. The active sampling device for persistent organic pollutants PAHs in the atmosphere according to claim 1, characterized in that: A storage cylinder (15) is provided below the hollow substrate (1) close to the second filter screen (12), and a second spring (16) is fixedly connected to the bottom of the storage cylinder (15).

6. The active sampling device for persistent organic pollutants PAHs in the atmosphere according to claim 1, characterized in that: The inner wall of the sampling cylinder (17) is fixedly connected to a housing (18), the second motor (19) is fixedly installed inside the housing (18), and the power fan (21) is rotationally connected to the sampling cylinder (17).

7. The active sampling device for persistent organic pollutants PAHs in the atmosphere according to claim 1, characterized in that: An adsorption component (22) is fixedly mounted on the inner wall of the sampling cylinder (17), and the adsorption component (22) is used for secondary filtering of the sampled gas.

8. The active sampling device for persistent organic pollutants PAHs in the atmosphere according to claim 1, characterized in that: A transmission tube (23) is fixedly connected to the bottom of the sampling cylinder (17), and a SPE extraction column tube (24) is fixedly connected to the side of the transmission tube (23) away from the sampling cylinder (17), and the SPE extraction column tube (24) is used to filter the sampled gas three times.

9. The active sampling device for persistent organic pollutants PAHs in the atmosphere according to claim 1, characterized in that: A gas storage cylinder (25) is fixedly connected to the side of the SPE extraction column tube (24), and the gas storage cylinder (25) is used to collect and store the gas after sampling and filtration.

10. The active sampling device for persistent organic pollutants PAHs in the atmosphere according to claim 9, characterized in that: A waste storage box (26) is fixedly connected to the top of the gas storage cylinder (25), and the waste storage box (26) is fixedly connected to the hollow base plate (1).

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