Graded filtering device for polycyclic aromatic hydrocarbon and micro-plastic solid-liquid suspension system

Abstract

The utility model belongs to the field of classified filtering devices, and particularly relates to a classified filtering device for a polycyclic aromatic hydrocarbon and micro-plastic solid-liquid suspension system, which comprises an upper shell and a lower shell, the lower shell is slidably connected in the lower end of the upper shell, the upper end of the upper shell is fixedly connected with a connecting pipe, and the lower end of the lower shell is fixedly connected with a liquid discharge pipe. Filtering mechanisms are arranged in the upper shell and the lower shell, two symmetrically-distributed fixing covers are fixedly connected to the upper portion of the outer side of the lower shell, and a limiting ring is fixedly connected to the lower portion of the outer side of the upper shell. An original filtering membrane is replaced by the upper shell, the lower shell, the filtering mechanisms and the like, an injector can be connected with the connecting pipe of the upper shell in the using process, micro-plastic in liquid is filtered through the filtering mechanisms in the upper shell and the lower shell, and therefore the filtering efficiency can be improved; and the over-arc-surface filter screen is made of a metal material, so that the data cannot be influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of graded filtering devices, in particular to a graded filtering device for a polycyclic aromatic hydrocarbon and microplastic solid-liquid suspension system. Background Art

[0002] Fluorescence spectroscopy is a technique that uses certain fluorescent or non-fluorescent substances to generate fluorescent groups through chemical reactions to detect the spectrum of substances. Because of its advantages of good selectivity, high sensitivity, and good reproducibility, it has been widely used in the detection of PAHs in the environment. At present, in order to explore the adsorption of PAHs by microplastics in aqueous solution, researchers collect the fluorescence intensity of PAHs in aqueous solution before and after microplastic adsorption, and convert the fluorescence intensity to the concentration of PAHs, thereby realizing the detection and analysis of the adsorption of PAHs by microplastics in aqueous solution. However, before the fluorescence detection of PAHs in aqueous solution, it is necessary to separate the mixed solution of microplastics and PAHs into solid and liquid, that is, to filter out the microplastics in the solution. At present, most researchers pre-treat samples before fluorescence measurement by selecting membrane filtration or filter paper filtration, but the above methods will cause problems such as a reduction in the amount of PAHs in aqueous solution and incomplete separation of microplastics and PAHs, thereby affecting the accuracy of quantifying the concentration of PAHs in aqueous solution by fluorescence intensity. On the other hand, it is usually necessary to perform infrared spectroscopy detection on microplastics after the adsorption of polycyclic aromatic hydrocarbons to study their microscopic adsorption interaction mechanism, but filter membranes and filter papers cannot effectively extract microplastics after the adsorption of polycyclic aromatic hydrocarbons or are prone to sample contamination during the extraction process, and the accuracy and effectiveness of infrared spectral data cannot be guaranteed. Therefore, in order to solve the above technical problems, the present invention improves the prior art and proposes a device that can achieve complete solid-liquid separation, effectively retain microplastic samples, and reduce the influence of filtration on the accuracy of quantitative analysis of the content of polycyclic aromatic hydrocarbons in aqueous solutions. Utility Model Content

[0003] The utility model aims to provide a grading filtration device for a solid-liquid suspension system of polycyclic aromatic hydrocarbons and microplastics, which solves the problems of low extraction efficiency, material influence on experimental data and inconvenience in extracting microplastics.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a graded filtering device for a solid-liquid suspension system of polycyclic aromatic hydrocarbons and microplastics, comprising an upper shell and a lower shell, the lower end of the upper shell is slidably connected to the lower shell, the upper end of the upper shell is fixedly connected to a connecting pipe, the lower end of the lower shell is fixedly connected to a drain pipe, and filtering mechanisms are arranged inside the upper shell and the lower shell, two symmetrically distributed fixed covers are fixedly connected to the upper outer part of the lower shell, a limiting ring is fixedly connected to the lower outer part of the upper shell, a connecting nail is slidably connected to the inside of the fixed cover, a limiting frame is installed on the outside of the connecting nail and on the outside of the fixed cover through a bearing, and a spring is arranged on the outside of the connecting nail.

[0005] Preferably, a rubber ring is fixedly connected to the lower part of the inner wall of the upper shell, and the rubber ring is slidably connected to the lower shell. A pull ring is fixedly connected to the side of the limiting frame away from the fixed cover, and the rubber ring can increase the sealing between the upper shell and the lower shell.

[0006] Preferably, the limiting frame is slidably connected to the limiting ring, the limiting frame is in contact with the upper shell, the limiting frame is in contact with the fixed cover, and the limiting frame can limit the upper shell through the limiting ring.

[0007] Preferably, one end of the spring one is fixedly connected to the connecting pin, and the other end of the spring one is fixedly connected to the fixing cover, and the spring one can drive the connecting pin to automatically reset through elastic force.

[0008] Preferably, the filtering mechanism includes a curved filter screen, the interiors of the upper shell and the lower shell are both slidably connected with a curved filter screen, the interiors of the upper shell and the lower shell are both slidably connected with a clamping ring, the interiors of the upper shell and the lower shell are both slidably connected with a silicone ring, the interiors of the upper shell and the lower shell are both clamped with a plurality of evenly distributed clamping seats, a spring 2 is arranged inside the clamping ring, and the curved filter screen can increase the filtering area through the curved surface, thereby accelerating the filtering efficiency.

[0009] Preferably, the arc filter is fixedly connected to the clamping ring, and the silicone ring is fixedly connected to the clamping ring, and the silicone ring can increase the sealing performance of the clamping ring.

[0010] Preferably, the snap-fit ​​seat is slidably connected to the snap-fit ​​ring, the aperture of the arc filter located inside the lower shell is larger than the aperture of the arc filter located inside the upper shell, and graded filtration can be achieved through the aperture difference between the two arc filters.

[0011] Preferably, one end of the second spring is fixedly connected to the clamping ring, and the other end of the second spring is fixedly connected to the clamping seat, and the second spring can drive the clamping seat to automatically reset through elastic force.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] 1. The utility model replaces the original filter membrane with an upper shell, a lower shell and a filtering mechanism. During use, the syringe can be connected to the connecting tube of the upper shell. After completion, the microplastics in the liquid are filtered through the filtering mechanism inside the upper shell and the lower shell, thereby improving the filtering efficiency. The arc filter is made of metal and will not affect the data.

[0014] 2. The utility model adds structures such as a fixed cover, a limit frame and a limit ring on the lower shell. During use, the limit frame can be driven by the elastic force of a spring to slide into the limit ring on the outside of the upper shell, thereby completing the splicing of the upper shell and the lower shell. When extraction is required, the upper shell and the lower shell can be separated, and the arc filter inside can be taken out, thereby making it easier to extract microplastics. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0016] Figure 2 For the utility model Figure 1 A three-dimensional cross-sectional view of

[0017] Figure 3 For the utility model Figure 2 A three-dimensional enlarged view of the filtering mechanism;

[0018] Figure 4 For the utility model Figure 2 A magnified view of the structure of part A;

[0019] Figure 5 For the utility model Figure 4 A three-dimensional enlarged view of the limit frame.

[0020] In the figure: 1. upper shell; 2. lower shell; 3. connecting pipe; 4. drain pipe; 5. filtering mechanism; 6. rubber ring; 7. fixing cover; 8. limiting ring; 9. connecting nail; 10. limiting frame; 11. spring 1; 12. pull ring; 51. arc filter; 52. snap ring; 53. silicone ring; 54. snap seat; 55. spring 2. DETAILED DESCRIPTION

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

[0022] See also Figure 1 , Figure 2 , Figure 4 A graded filtering device for a solid-liquid suspension system of polycyclic aromatic hydrocarbons and microplastics comprises an upper shell 1 and a lower shell 2, the lower end of the upper shell 1 is slidably connected to the lower shell 2, the upper end of the upper shell 1 is fixedly connected to a connecting pipe 3, the lower end of the lower shell 2 is fixedly connected to a drain pipe 4, a filtering mechanism 5 is arranged inside both the upper shell 1 and the lower shell 2, two symmetrically distributed fixed covers 7 are fixedly connected to the upper outer part of the lower shell 2, a limiting ring 8 is fixedly connected to the lower outer part of the upper shell 1, a connecting nail 9 is slidably connected to the inside of the fixed cover 7, a limiting frame 10 is installed on the outer side of the connecting nail 9 and on the outer side of the fixed cover 7 through a bearing, and a spring 11 is arranged on the outer side of the connecting nail 9.

[0023] See also Figure 1 , Figure 2 , Figure 4 A rubber ring 6 is fixedly connected to the lower part of the inner wall of the upper shell 1, and the rubber ring 6 is slidably connected to the lower shell 2. A pull ring 12 is fixedly connected to the side of the limit frame 10 away from the fixed cover 7. The rubber ring 6 can increase the sealing between the upper shell 1 and the lower shell 2. The limit frame 10 is slidably connected to the limit ring 8. The limit frame 10 contacts the upper shell 1, and the limit frame 10 contacts the fixed cover 7. The limit frame 10 can limit the upper shell 1 through the limit ring 8. One end of the spring 11 is fixedly connected to the connecting nail 9, and the other end of the spring 11 is fixedly connected to the fixed cover 7. The spring 11 can drive the connecting nail 9 to automatically reset through elastic force.

[0024] See also Figure 1 , Figure 2 , Figure 4 , Figure 5 The filtering mechanism 5 includes a curved filter screen 51, the interior of the upper shell 1 and the lower shell 2 are both slidably connected with the curved filter screen 51, the interior of the upper shell 1 and the lower shell 2 are both slidably connected with a clamping ring 52, the interior of the upper shell 1 and the lower shell 2 are both slidably connected with a silicone ring 53, the interior of the upper shell 1 and the lower shell 2 are both clamped with a plurality of uniformly distributed clamping seats 54, and the interior of the clamping ring 52 is provided with a spring 2 55. The curved filter screen 51 can increase the filtering area through the curved surface and speed up the filtering efficiency. The curved filter screen 51 is fixedly connected to the clamping ring 52, and the silicone ring 53 is fixedly connected to the snap ring 52, the silicone ring 53 can increase the sealing of the snap ring 52, the snap seat 54 is slidably connected to the snap ring 52, the aperture of the arc filter 51 located inside the lower shell 2 is larger than the aperture of the arc filter 51 located inside the upper shell 1, and graded filtration can be achieved through the aperture difference between the two arc filter screens 51, one end of the spring 55 is fixedly connected to the snap ring 52, and the other end of the spring 55 is fixedly connected to the snap seat 54, and the spring 55 can drive the snap seat 54 to automatically reset through elastic force.

[0025] The specific implementation process of the utility model is as follows: when in use, the syringe is connected to the connecting tube 3, and then the syringe sucks the liquid into the syringe through the discharge tube 4 of the lower shell 2. After the suction, the liquid can be filtered through two curved filter screens 51 with different apertures. After the filtering is completed, when the microplastics need to be extracted, the pull ring 12 is pulled, and the pull ring 12 drives the limit frame 10 to move, and compresses the spring 11 through the connecting nail 9. When the limit frame 10 is separated from the limit ring 8, the limit on the upper shell 1 can be released, and then the upper shell 1 can be removed. After removal, the curved filter screen 51 is pulled, and the curved filter screen 51 drives the clamping ring 52 to move. During the movement, the clamping ring 52 drives the clamping seat 54 to slide toward the inside of the clamping ring 52 and compresses the spring 2 55. When the clamping seat 54 is separated from the upper shell 1 or the lower shell 2, the curved filter screen 51 can be taken out, and the microplastics can be conveniently extracted.

[0026] 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. A grading filtration device for a polycyclic aromatic hydrocarbon and microplastic solid-liquid suspension system, comprising an upper shell (1) and a lower shell (2), characterized in that: The lower end of the upper shell (1) is slidably connected to the lower shell (2), the upper end of the upper shell (1) is fixedly connected to a connecting pipe (3), the lower end of the lower shell (2) is fixedly connected to a drain pipe (4), the upper shell (1) and the lower shell (2) are both provided with a filtering mechanism (5), the upper outer portion of the lower shell (2) is fixedly connected to two symmetrically distributed fixed covers (7), the lower outer portion of the upper shell (1) is fixedly connected to a limiting ring (8), the interior of the fixed cover (7) is slidably connected to a connecting pin (9), a limiting frame (10) is installed on the outer side of the connecting pin (9) and located on the outer side of the fixed cover (7) through a bearing, and a spring (11) is provided on the outer side of the connecting pin (9).

2. The device for grading and filtering a solid-liquid suspension system of polycyclic aromatic hydrocarbons and microplastics according to claim 1, characterized in that: A rubber ring (6) is fixedly connected to the lower portion of the inner wall of the upper shell (1), and the rubber ring (6) is slidably connected to the lower shell (2). A pull ring (12) is fixedly connected to the side of the limiting frame (10) away from the fixed cover (7).

3. The device for grading and filtering a solid-liquid suspension system of polycyclic aromatic hydrocarbons and microplastics according to claim 1, characterized in that: The limiting frame (10) is slidably connected to the limiting ring (8), the limiting frame (10) is in contact with the upper shell (1), and the limiting frame (10) is in contact with the fixed cover (7).

4. The device for grading and filtering a solid-liquid suspension system of polycyclic aromatic hydrocarbons and microplastics according to claim 1, characterized in that: One end of the spring one (11) is fixedly connected to the connecting pin (9), and the other end of the spring one (11) is fixedly connected to the fixing cover (7).

5. The device for grading and filtering a solid-liquid suspension system of polycyclic aromatic hydrocarbons and microplastics according to claim 1, characterized in that: The filtering mechanism (5) comprises a curved filter screen (51), the curved filter screen (51) is slidably connected inside the upper shell (1) and the lower shell (2), a clamping ring (52) is slidably connected inside the upper shell (1) and the lower shell (2), a silicone ring (53) is slidably connected inside the upper shell (1) and the lower shell (2), a plurality of evenly distributed clamping seats (54) are clamped inside the upper shell (1) and the lower shell (2), and a second spring (55) is arranged inside the clamping ring (52).

6. The device for grading and filtering a solid-liquid suspension system of polycyclic aromatic hydrocarbons and microplastics according to claim 5, characterized in that: The arc surface filter (51) is fixedly connected to the clamping ring (52), and the silicone ring (53) is fixedly connected to the clamping ring (52).

7. The device for grading and filtering a solid-liquid suspension system of polycyclic aromatic hydrocarbons and microplastics according to claim 5, characterized in that: The clamping seat (54) is slidably connected to the clamping ring (52); the aperture of the arc-surface filter (51) located inside the lower shell (2) is larger than the aperture of the arc-surface filter (51) located inside the upper shell (1).

8. The device for grading and filtering a solid-liquid suspension system of polycyclic aromatic hydrocarbons and microplastics according to claim 5, characterized in that: One end of the second spring (55) is fixedly connected to the clamping ring (52), and the other end of the second spring (55) is fixedly connected to the clamping seat (54).

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