Sampling device for micro-nano plastic in water body

Abstract

The utility model provides a sampling device for micro-nano plastic in a water body. According to the utility model, the filter screens with different pore sizes are arranged in the first filter, the second filter and the third filter, so that micro-nano plastics with different particle sizes in a water body can be sampled; the device is suitable for various different water bodies and can be used for collecting micro-nano plastic of which the particle size reaches the nano level; meanwhile, the device can be used for sampling large-volume water samples; the first filter screen is detachably connected with the first outlet pipe, the second filter screen is detachably connected with the second outlet pipe, and the third filter screen is detachably connected with the third outlet pipe, so that the first filter screen, the second filter screen and the third filter screen are convenient to replace; according to the sampling device provided by the utility model, each component is detachable, the whole device is convenient to disassemble and assemble, each component is convenient to carry, and each component is brought to a use site before being used and is assembled into the sampling device according to the condition of a water body when being used.

Description

Technical Field

[0001] The utility model relates to the technical field of water sampling, in particular to a sampling device for micro-nano plastics in water bodies. Background Technique

[0002] Plastic products are ubiquitous in the life of modern human society. However, during the use and disposal of these products, they will gradually decompose or degrade into smaller micron or nano-sized particles, becoming a new type of micro-nano plastic pollutant. When micro-nano plastic pollutants enter water bodies, they will not only affect aquatic organisms, but also enter the human body through drinking water, thus posing a potential threat to human health. In order to accurately assess the health risks of micro-nano plastics, it is necessary to establish simple and accurate analytical methods to comprehensively understand the occurrence status of micro-nano plastics in water bodies. The analytical methods of micro-nano plastics generally include steps such as sample collection, sample digestion, and sample determination. Sample collection is the key prerequisite for accurately analyzing the types, particle sizes, and contents of micro-nano plastics. Due to the water-insoluble nature of micro-nano plastics, filtration is the most commonly used method during the sample collection process. Generally, several liters or even hundreds of liters of sample volume are required for the collection of micro-nano plastics in water bodies. The traditional method of taking samples back to the laboratory for analysis is obviously more troublesome and prone to introducing new pollution.

[0003] In addition, different water samplings may require filters or filter elements with different particle sizes. Therefore, it is very necessary to design a device suitable for sampling water bodies containing micro-nano plastics with different particle sizes. Content of the Utility Model

[0004] In view of this, the utility model provides a sampling device for micro-nano plastics in water bodies to solve the defects existing in the prior art.

[0005] In a first aspect, the utility model provides a sampling device for micro-nano plastics in water bodies, comprising:

[0006] A first filter, one side of which is connected to a first inlet pipe, and the other side is connected to a first outlet pipe. A first filter screen is arranged inside the first filter, and one end of the first filter screen is connected to the first outlet pipe;

[0007] A second filter, one side of which is connected to a second inlet pipe, and the other side is connected to a second outlet pipe. A second filter screen is arranged inside the second filter, and one end of the second filter screen is connected to the second outlet pipe;

[0008] A third filter, one side of which is connected to a third inlet pipe, and the other side is connected to a third outlet pipe. A third filter screen is arranged inside the third filter, and one end of the third filter screen is connected to the third outlet pipe;

[0009] Wherein, the first outlet pipe communicates with the second inlet pipe, and the third inlet pipe communicates with the second outlet pipe;

[0010] The aperture of the first filter screen is 90 - 110 μm, the aperture of the second filter screen is 18 - 22 μm, and the aperture of the third filter screen is 0.20 - 0.24 μm.

[0011] Preferably, one end of the first filter screen is detachably connected to the first outlet pipe and communicates with the first outlet pipe;

[0012] One end of the second filter screen is detachably connected to the second outlet pipe and communicates with the second outlet pipe;

[0013] One end of the third filter screen is detachably connected to the third outlet pipe and communicates with the third outlet pipe.

[0014] Preferably, the first filter, the second filter, and the third filter each include a first filtering part and a second filtering part;

[0015] The first filtering part and the second filtering part are detachably connected by a clamp;

[0016] The first inlet pipe and the first outlet pipe are both arranged on the second filtering part of the first filter;

[0017] The second inlet pipe and the second outlet pipe are both arranged on the second filtering part of the second filter;

[0018] The third inlet pipe and the third outlet pipe are both arranged on the second filtering part of the third filter.

[0019] Preferably, an arc-shaped pipe is provided in each of the first filter, the second filter, and the third filter;

[0020] One end of the arc-shaped pipe in the first filter communicates with the first outlet pipe, and the other end is detachably connected to the first filter screen;

[0021] One end of the arc-shaped pipe in the second filter communicates with the second outlet pipe, and the other end is detachably connected to the second filter screen;

[0022] One end of the arc-shaped pipe in the third filter communicates with the third outlet pipe, and the other end is detachably connected to the third filter screen.

[0023] Preferably, a first connecting pipe is provided at the end of the first filter screen close to the first outlet pipe, and the end of the first connecting pipe is clamped inside the end of the arc-shaped pipe in the first filter;

[0024] A second connecting pipe is provided at the end of the second filter screen close to the second outlet pipe, and the end of the second connecting pipe is clamped inside the end of the arc-shaped pipe in the second filter;

[0025] A third connecting pipe is provided at the end of the third filter screen close to the third outlet pipe, and the end of the third connecting pipe is clamped inside the end of the arc-shaped pipe in the third filter.

[0026] Preferably, the first outlet pipe and the second inlet pipe are connected through a first communication pipe;

[0027] The third inlet pipe and the second outlet pipe are connected through a second communication pipe;

[0028] Both ends of the first communication pipe are detachably connected to the first outlet pipe and the second inlet pipe respectively;

[0029] Both ends of the second communication pipe are detachably connected to the third inlet pipe and the second outlet pipe respectively.

[0030] Preferably, it further includes a water inlet pipe, and the water inlet pipe is communicated with the end of the first inlet pipe far from the first filter screen;

[0031] A water pump is provided on the water inlet pipe;

[0032] The end of the water inlet pipe is detachably connected to the end of the first inlet pipe.

[0033] Preferably, it further includes a water outlet pipe, and the water outlet pipe is communicated with the end of the third outlet pipe far from the third filter screen;

[0034] A flow meter is provided on the water outlet pipe;

[0035] The end of the water outlet pipe is detachably connected to the end of the third outlet pipe.

[0036] Preferably, pressure gauges are provided on the first filter, the second filter, and the third filter;

[0037] Drain valves are provided on the first filter, the second filter, and the third filter.

[0038] Preferably, a first sealing ring is provided at the connection between the first connecting pipe and the arc-shaped pipe in the first filter to achieve the seal at the connection;

[0039] A second sealing ring is provided at the connection between the second connecting pipe and the arc-shaped pipe in the second filter to achieve the seal at the connection;

[0040] A third sealing ring is provided at the connection between the third connecting pipe and the arc-shaped pipe in the third filter to achieve the seal at the connection.

[0041] The sampling device for micro-nano plastics in water bodies of the present utility model has the following beneficial effects compared with the prior art:

[0042] 1. The sampling device for micro-nano plastics in water bodies of the present utility model includes: a first filter, a second filter, and a third filter; a first filter screen is provided inside the first filter, a second filter screen is provided inside the second filter, and a third filter screen is provided inside the third filter 5. The pore diameter of the first filter screen is 90-110 μm, the pore diameter of the second filter screen is 18-22 μm, and the pore diameter of the third filter screen is 0.20-0.24 μm. By setting filter screens with different pore sizes inside the first filter, the second filter, and the third filter, the present utility model can sample micro-nano plastics with different particle sizes in water bodies, is applicable to a variety of different water bodies, and can collect micro-nano plastics with particle sizes reaching the nanometer level in water bodies. At the same time, the present utility model can perform sampling and treatment of large-volume water samples;

[0043] 2. For the sampling device for micro-nano plastics in water bodies of the present utility model, the first filter, the second filter, and the third filter all include a first filtering part and a second filtering part that are detachably connected. The first filter screen is detachably connected to the first outlet pipe, the second filter screen is detachably connected to the second outlet pipe, and the third filter screen is detachably connected to the third outlet pipe, which facilitates the replacement of the first filter screen, the second filter screen, and the third filter screen;

[0044] 3. For the sampling device for micro-nano plastics in water bodies of the present utility model, the water inlet pipe, the water outlet pipe, the first connecting pipe, and the second connecting pipe are all detachably connected; the first filter, the second filter, and the third filter all include a first filtering part and a second filtering part that are detachably connected; the first filter screen is detachably connected to the first outlet pipe, the second filter screen is detachably connected to the second outlet pipe, and the third filter screen is detachably connected to the third outlet pipe; each component is detachable, the whole device is convenient to disassemble and assemble, and each component is convenient to carry. Before use, each component is taken to the use site and assembled into a sampling device according to the water body situation during use. Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0046] Figure 1 It is a schematic structural diagram of the sampling device for micro-nano plastics in water bodies of the present utility model;

[0047] Figure 2 It is a schematic structural diagram of the first filter in one embodiment of the present utility model;

[0048] Figure 3 Schematic diagram of the connection structure between the first filter screen and the arc-shaped pipe in one embodiment of the present utility model;

[0049] Figure 4 Schematic diagram of the connection structure between the first filter screen and the first connecting pipe in one embodiment of the present utility model;

[0050] Figure 5 Top view of the first connecting pipe in one embodiment of the present utility model;

[0051] Figure 6 Top view of the end of the arc-shaped pipe in the first filter in one embodiment of the present utility model;

[0052] Figure 7 Schematic diagram showing the elastic protrusion located in the groove when the first connecting pipe is inserted into the end of the arc-shaped pipe in one embodiment of the present utility model;

[0053] Figure 8 Schematic diagram showing that when the first connecting pipe is rotated clockwise by 90°, the elastic protrusion is clamped in the card slot in one embodiment of the present utility model. Detailed implementation manners

[0054] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0055] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the scope of protection of the present utility model.

[0056] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0057] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper" is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0058] In addition, terms such as "first" and "second" are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0059] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0060] An embodiment of the present utility model provides a sampling device for micro-nano plastics in water body, as Figures 1 to 8 shown, including:

[0061] A first filter 1, one side of which is connected to a first inlet pipe 11 and the other side is connected to a first outlet pipe 12. A first filter screen 2 is provided in the first filter 1, and one end of the first filter screen 2 is connected to the first outlet pipe 12;

[0062] A second filter 3, one side of which is connected to a second inlet pipe 31 and the other side is connected to a second outlet pipe 32. A second filter screen 4 is provided in the second filter 3, and one end of the second filter screen 4 is connected to the second outlet pipe 32;

[0063] A third filter 5, one side of which is connected to a third inlet pipe 51 and the other side is connected to a third outlet pipe 52. A third filter screen 6 is provided in the third filter 5, and one end of the third filter screen 6 is connected to the third outlet pipe 52;

[0064] Wherein, the first outlet pipe 12 is connected to the second inlet pipe 31, and the third inlet pipe 51 is connected to the second outlet pipe 32;

[0065] The pore size of the first filter screen 2 is 90 - 110 μm, the pore size of the second filter screen 4 is 18 - 22 μm, and the pore size of the third filter screen 6 is 0.20 - 0.24 μm.

[0066] The sampling device for micro-nano plastics in water bodies of the present utility model includes: a first filter 1, a second filter 3, and a third filter 5; a first filter screen 2 is provided inside the first filter 1, a second filter screen 4 is provided inside the second filter 3, and a third filter screen 6 is provided inside the third filter 5; during use, the water body containing micro-nano plastics in the environment enters the first filter 1 through the first inlet pipe 11. As the water level in the first filter 1 rises and reaches the first filter screen 2, the first filter screen 2 filters the water. The filtered water passes through the first outlet pipe 12 and the second inlet pipe 31 and enters the second filter 3. As the water level in the second filter 3 rises and reaches the second filter screen 4, the second filter screen 4 filters the water. The filtered water passes through the second outlet pipe 32 and the third inlet pipe 51 and enters the third filter 5. As the water level in the third filter 5 rises and reaches the third filter screen 6, the third filter screen 6 filters the water and flows out through the third outlet pipe 52; it can be understood that the particle size of the micro-nano plastics in the water body in the first filter 1 is greater than 90 - 110 μm. By analyzing the water body in the first filter 1, the concentration of micro-nano plastics with a particle size greater than 90 - 110 μm can be detected; the particle size of the micro-nano plastics in the water body in the second filter 3 is greater than 18 - 22 μm and less than 90 - 110 μm. By analyzing the water body in the second filter 3, the concentration of micro-nano plastics with a particle size greater than 18 - 22 μm and less than 90 - 110 μm can be detected; the particle size of the micro-nano plastics in the water body in the third filter 5 is less than 18 - 22 μm and greater than 0.20 - 0.24 μm. By analyzing the water body in the third filter 5, the concentration of micro-nano plastics with a particle size less than 18 - 22 μm and greater than 0.20 - 0.24 μm can be detected; and the particle size of the micro-nano plastics in the water body flowing out through the third outlet pipe 52 is less than 0.20 - 0.24 μm. By analyzing the water body flowing out through the third outlet pipe 52, the concentration of micro-nano plastics with a particle size less than 0.20 - 0.24 μm can be detected; the present utility model can realize sampling of micro-nano plastics with different particle sizes in the water body by setting filter screens with different pore sizes in the first filter 1, the second filter 3, and the third filter 5, is applicable to a variety of different water bodies, and can collect micro-nano plastics with a particle size reaching the nanoscale (less than 240 nm) in the water body; at the same time, the present utility model contains three filters and can perform sampling and treatment of large-volume water samples.

[0067] In some embodiments, one end of the first filter screen 2 is detachably connected to the first outlet pipe 12 and is in communication with the first outlet pipe 12;

[0068] One end of the second filter screen 4 is detachably connected to the second outlet pipe 32 and is in communication with the second outlet pipe 32;

[0069] One end of the third filter screen 6 is detachably connected to the third outlet pipe 52 and is in communication with the third outlet pipe 52.

[0070] In the above embodiments, the first filter screen 2 is detachably connected to the first outlet pipe 12, the second filter screen 4 is detachably connected to the second outlet pipe 32, and the third filter screen 6 is detachably connected to the third outlet pipe 52, which facilitates the replacement of the first filter screen 2, the second filter screen 4, and the third filter screen 6; specifically, the detachable manner can be snap connection, screw connection, etc.

[0071] In some embodiments, the first filter 1, the second filter 3, and the third filter 5 each include a first filtering portion 13 and a second filtering portion 14;

[0072] The first filtering portion 13 and the second filtering portion 14 are detachably connected by a clamp 15;

[0073] The first inlet pipe 11 and the first outlet pipe 12 are both provided on the second filtering portion 14 of the first filter 1;

[0074] The second inlet pipe 31 and the second outlet pipe 32 are both provided on the second filtering portion 14 of the second filter 3;

[0075] The third inlet pipe 51 and the third outlet pipe 52 are both provided on the second filtering portion 14 of the third filter 5.

[0076] In the above embodiments, the first filter 1, the second filter 3, and the third filter 5 are all in the shape of a hollow cylinder. The first filter 1, the second filter 3, and the third filter 5 each include a first filtering portion 13 and a second filtering portion 14. The first filtering portion 13 and the second filtering portion 14 are detachably connected by a clamp 15. The first filtering portion 13 and the second filtering portion 14 respectively enclose to form the first filter 1, the second filter 3, and the third filter 5; the first filtering portion 13 and the second filtering portion 14 are detachably connected by a clamp 15, so that detachable assembly can be achieved, and it is convenient to replace and assemble the first filter screen 2, the second filter screen 4, and the third filter screen 6 inside the first filter 1, the second filter 3, and the third filter 5.

[0077] In some embodiments, an arc-shaped pipe 7 is provided inside each of the first filter 1, the second filter 3, and the third filter 5;

[0078] One end of the arc-shaped pipe 7 inside the first filter 1 is communicated with the first outlet pipe 12, and the other end is detachably connected to the first filter screen 2;

[0079] One end of the arc-shaped pipe 7 inside the second filter 3 is communicated with the second outlet pipe 32, and the other end is detachably connected to the second filter screen 4;

[0080] One end of the arc-shaped pipe 7 inside the third filter 5 is communicated with the third outlet pipe 52, and the other end is detachably connected to the third filter screen 6.

[0081] In the above embodiments, the first filter screen 2 is detachably connected and communicated with the first outlet pipe 12 through the arc-shaped pipe 7 in the first filter 1; the second filter screen 4 is detachably connected and communicated with the second outlet pipe 32 through the arc-shaped pipe 7 in the second filter 3; the third filter screen 6 is detachably connected and communicated with the third outlet pipe 52 through the arc-shaped pipe 7 in the third filter 5.

[0082] In some embodiments, a first connecting pipe 21 is provided at the end of the first filter screen 2 close to the first outlet pipe 12, and the end of the first connecting pipe 21 is clamped inside the end of the arc-shaped pipe 7 in the first filter 1;

[0083] A second connecting pipe is provided at the end of the second filter screen 4 close to the second outlet pipe, and the end of the second connecting pipe is clamped inside the end of the arc-shaped pipe in the second filter;

[0084] A third connecting pipe is provided at the end of the third filter screen 6 close to the third outlet pipe, and the end of the third connecting pipe is clamped inside the end of the arc-shaped pipe in the third filter.

[0085] In the above embodiments, a first connecting pipe 21 is provided at the end of the first filter screen 2, and the end of the first connecting pipe 21 is clamped inside the end of the arc-shaped pipe 7 in the first filter 1, so as to realize the detachable connection of the first filter screen 2 to the first outlet pipe 12; specifically, elastic protrusions 22 can be provided on both sides of the first connecting pipe 21. Correspondingly, grooves 71 are provided on the inner wall of the end of the arc-shaped pipe 7 in the first filter 1 corresponding to the elastic protrusions 22. At the same time, clamping grooves 72 are provided on the inner wall of the end of the arc-shaped pipe 7 in the first filter 1 and located between the two grooves 71, and the clamping grooves 72 are adapted to the elastic protrusions 22; in use, align the elastic protrusions 22 of the first connecting pipe 21 with the grooves 71 on the inner wall of the end of the arc-shaped pipe 7, and insert the first connecting pipe 21 into the end of the arc-shaped pipe 7. At this time, the elastic protrusions 22 are located in the grooves 71, and then rotate the first connecting pipe 21 just to make the elastic protrusions 22 clamped in the clamping grooves 72, so that the first connecting pipe 21 can be clamped inside the end of the arc-shaped pipe 7 in the first filter 1, and further realize the detachable connection of the first filter screen 2 to the arc-shaped pipe 7; when the first filter screen 2 needs to be replaced, just rotate the first connecting pipe 21 to make the elastic protrusions 22 located in the grooves 71, and then pull out the first connecting pipe 21 upward to detach the first filter screen 2 from the end of the arc-shaped pipe 7. Further refer to Figures 5 to 8 as shown, Figure 5 shows a top view of the first connecting pipe 21, Figure 6 shows a top view of the end of the arc-shaped pipe 7 in the first filter 1, Figure 7 shows a schematic diagram of the elastic protrusions 22 located in the grooves 71 when the first connecting pipe 21 is inserted into the end of the arc-shaped pipe 7, Figure 8Shows a schematic diagram of the elastic protrusion 22 being clamped in the card slot 72 when the first connecting pipe 21 is rotated clockwise by 90°. Correspondingly, the second connecting pipe and the third connecting pipe also adopt the same structure as the first connecting pipe 21 to achieve the detachable connection between the second connecting pipe and the arc-shaped pipe in the second filter, and the detachable connection between the third connecting pipe and the arc-shaped pipe in the third filter.

[0086] In some embodiments, the first outlet pipe 12 and the second inlet pipe 31 are connected through a first communicating pipe 8;

[0087] The third inlet pipe 51 and the second outlet pipe 32 are connected through a second communicating pipe 9;

[0088] Both ends of the first communicating pipe 8 are detachably connected to the first outlet pipe 12 and the second inlet pipe 31 respectively;

[0089] Both ends of the second communicating pipe 9 are detachably connected to the third inlet pipe 51 and the second outlet pipe 32 respectively.

[0090] In the above embodiments, the first communicating pipe 8 is detachably connected to the first outlet pipe 12 and the second inlet pipe 31 through clamps respectively, and both ends of the first communicating pipe 8 can also be detachably connected to the first outlet pipe 12 and the second inlet pipe 31 by means of threaded connections; the second communicating pipe 9 is detachably connected to the third inlet pipe 51 and the second outlet pipe 32 through clamps respectively, and both ends of the second communicating pipe 9 can also be detachably connected to the third inlet pipe 51 and the second outlet pipe 32 by means of threaded connections.

[0091] In some embodiments, a water inlet pipe 93 is further included, and the water inlet pipe 93 is connected to the end of the first inlet pipe 11 away from the first filter screen 2;

[0092] A water pump 94 is provided on the water inlet pipe 93;

[0093] The end of the water inlet pipe 93 is detachably connected to the end of the first inlet pipe 11.

[0094] Specifically, in the above embodiments, the end of the water inlet pipe 93 and the end of the first inlet pipe 11 can be detachably connected through a clamp; the end of the water inlet pipe 93 and the end of the first inlet pipe 11 can also be detachably connected by means of threaded connections. The water pump 94 can specifically adopt a peristaltic pump, a vortex pump and other existing water pumps. Which type of water pump is specifically adopted is selected according to the actual sampling environment.

[0095] In some embodiments, a water outlet pipe 91 is further included, and the water outlet pipe 91 is connected to the end of the third outlet pipe 52 away from the third filter screen 6;

[0096] A flow meter 92 is provided on the water outlet pipe 91;

[0097] The end of the water outlet pipe 91 is detachably connected to the end of the third outlet pipe 52.

[0098] In the above embodiment, the end of the water outlet pipe 91 and the end of the third outlet pipe 52 can be detachably connected by a clamp; the end of the water outlet pipe 91 and the end of the third outlet pipe 52 can also be detachably connected by means of a threaded connection.

[0099] In the above embodiment, the water inlet pipe 93, the water outlet pipe 91, the first connecting pipe 8, and the second connecting pipe 9 are all detachably connected; the first filter 1, the second filter 3, and the third filter 5 all include a first filtering part 13 and a second filtering part 14 that are detachably connected; the first filter screen 2 and the first outlet pipe 12, the second filter screen 4 and the second outlet pipe 32, and the third filter screen 6 and the third outlet pipe 52 are all detachably connected; in this way, each component can be detached, which is convenient for carrying. Before use, each component is taken to the use site, and when in use, it is assembled into a sampling device according to the water body situation.

[0100] In some embodiments, pressure gauges 16 are provided on the first filter 1, the second filter 3, and the third filter 5.

[0101] Specifically, the pressure gauge 16 on the first filter 1 can monitor the pressure inside the first filter 1; the pressure gauge 16 on the second filter 3 can monitor the pressure inside the second filter 3; the pressure gauge 16 on the third filter 5 can monitor the pressure inside the third filter 5; the pressure gauges 16 are all arranged at the upper end of the filter. Specifically, the pressure gauge 16 is arranged at the upper end of the first filtering part 13 of the filter.

[0102] In some embodiments, drain valves 17 are provided on the first filter 1, the second filter 3, and the third filter 5.

[0103] In the above embodiment, opening the drain valve 17 can respectively drain the water bodies inside the first filter 1, the second filter 3, and the third filter 5.

[0104] In some embodiments, a first sealing ring is provided at the connection between the first connecting pipe 21 and the arc-shaped pipe 7 inside the first filter 1 to achieve the sealing of the connection;

[0105] A second sealing ring is provided at the connection between the second connecting pipe and the arc-shaped pipe inside the second filter to achieve the sealing of the connection;

[0106] A third sealing ring is provided at the connection between the third connecting pipe and the arc-shaped pipe inside the third filter to achieve the sealing of the connection.

[0107] Specifically, a first sealing ring 23 is sleeved on the outer periphery of the first connecting pipe 21. The first sealing ring 23 is located below the elastic protrusion 22, and the number of the first sealing rings 23 is two. When the end of the first connecting pipe 21 is inserted into the arc-shaped pipe 7 and the first connecting pipe 21 is rotated to make the elastic protrusion 22 engaged in the clamping groove 72, the first sealing ring 23 plays a role in sealing the first connecting pipe 21 and the arc-shaped pipe 7. Correspondingly, the second sealing ring and the third sealing ring also adopt the same structural method as the first sealing ring 23 to achieve the sealing of the connection part.

[0108] In the above embodiment, the clamp can adopt a KF vacuum clamp.

[0109] For further reference Figure 1 As shown, the water body containing micro-nano plastics in the environment flows into the water inlet pipe 93 under the action of the water pump 94, enters the first filter 1 through the first inlet pipe 11, and the first filter screen 2 filters the water. The filtered water passes through the first outlet pipe 12 and the second inlet pipe 31 and enters the second filter 3. The second filter screen 4 filters the water. The filtered water passes through the second outlet pipe 32 and the third inlet pipe 51 and enters the third filter 5. The third filter screen 6 filters the water and flows out to the water outlet pipe 91 through the third outlet pipe 52. Figure 1 The arrows in the figure indicate the flow direction of the water body. During sampling, the pressure gauge 16 can measure the pressure in the first filter 1, the second filter 3, and the third filter 5 respectively, and the flow meter 92 on the water outlet pipe 91 can monitor the flow rate of the water body in the water outlet pipe 91. When it is necessary to analyze the concentration of micro-nano plastics in the water body in the first filter 1, just open the drain valve on the first filter 1. When it is necessary to analyze the concentration of micro-nano plastics in the water body in the second filter 3, just open the drain valve on the second filter 3. When it is necessary to analyze the concentration of micro-nano plastics in the water body in the third filter 5, just open the drain valve on the third filter 5. And by collecting the water flowing out from the water outlet pipe 91, the concentration of micro-nano plastics in the water body filtered by the third filter screen 6 can be analyzed. After sampling, open the first filter 1, the second filter 3, and the third filter 5 respectively, and replace the first filter screen 2, the second filter screen 4, and the third filter screen 6 to carry out the sampling work of the new water body.

[0110] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sampling device for micro-nano plastics in water bodies, characterized in that, Including: A first filter, with a first inlet pipe connected to one side and a first outlet pipe connected to the other side. A first filter screen is provided inside the first filter, and one end of the first filter screen is connected to the first outlet pipe; A second filter, with a second inlet pipe connected to one side and a second outlet pipe connected to the other side. A second filter screen is provided inside the second filter, and one end of the second filter screen is connected to the second outlet pipe; A third filter, with a third inlet pipe connected to one side and a third outlet pipe connected to the other side. A third filter screen is provided inside the third filter, and one end of the third filter screen is connected to the third outlet pipe; Wherein, the first outlet pipe is connected to the second inlet pipe, and the third inlet pipe is connected to the second outlet pipe; The aperture of the first filter screen is 90 - 110μm, the aperture of the second filter screen is 18 - 22μm, and the aperture of the third filter screen is 0.20 - 0.24μm.

2. The sampling device for micro-nano plastics in water as described in claim 1, wherein, One end of the first filter screen is detachably connected to the first outlet pipe and is connected to the first outlet pipe; One end of the second filter screen is detachably connected to the second outlet pipe and is connected to the second outlet pipe; One end of the third filter screen is detachably connected to the third outlet pipe and is connected to the third outlet pipe.

3. The sampling device for micro-nano plastics in water as claimed in claim 2, wherein The first filter, the second filter, and the third filter all include a first filtering part and a second filtering part; The first filtering part and the second filtering part are detachably connected by a clamp; The first inlet pipe and the first outlet pipe are both arranged on the second filtering part of the first filter; The second inlet pipe and the second outlet pipe are both arranged on the second filtering part of the second filter; The third inlet pipe and the third outlet pipe are both arranged on the second filtering part of the third filter.

4. The sampling device for micro-nano plastics in water as claimed in claim 2, wherein, An arc-shaped pipe is provided inside each of the first filter, the second filter, and the third filter; One end of the arc-shaped pipe inside the first filter is connected to the first outlet pipe, and the other end is detachably connected to the first filter screen; One end of the arc-shaped pipe inside the second filter is connected to the second outlet pipe, and the other end is detachably connected to the second filter screen; One end of the arc-shaped pipe inside the third filter is connected to the third outlet pipe, and the other end is detachably connected to the third filter screen.

5. The sampling device for micro-nano plastics in water as described in claim 4, wherein, A first connecting pipe is provided at the end of the first filter screen close to the first outlet pipe, and the end of the first connecting pipe is clamped inside the end of the arc-shaped pipe inside the first filter; A second connecting pipe is provided at the end of the second filter screen close to the second outlet pipe, and the end of the second connecting pipe is clamped inside the end of the arc-shaped pipe inside the second filter; A third connecting pipe is provided at the end of the third filter screen close to the third outlet pipe, and the end of the third connecting pipe is clamped inside the end of the arc-shaped pipe inside the third filter.

6. The sampling device for micro-nano plastics in water as described in claim 1, characterized in that, The first outlet pipe and the second inlet pipe are connected by a first connecting pipe; The third inlet pipe and the second outlet pipe are connected by a second connecting pipe; Both ends of the first connecting pipe are detachably connected to the first outlet pipe and the second inlet pipe respectively; Both ends of the second connecting pipe are detachably connected to the third inlet pipe and the second outlet pipe respectively.

7. The sampling device for micro-nano plastics in water as claimed in claim 1, wherein, It further includes a water inlet pipe which is communicated with the end of the first inlet pipe far away from the first filter screen; A water pump is provided on the water inlet pipe; The end of the water inlet pipe is detachably connected to the end of the first inlet pipe.

8. The sampling device for micro-nano plastics in water bodies according to claim 1, characterized in that It further includes a water outlet pipe which is communicated with the end of the third outlet pipe far away from the third filter screen; A flow meter is provided on the water outlet pipe; The end of the water outlet pipe is detachably connected to the end of the third outlet pipe.

9. The sampling device for micro-nano plastics in water as described in any one of claims 1 to 8, characterized in that, Pressure gauges are provided on the first filter, the second filter and the third filter; Drain valves are provided on the first filter, the second filter and the third filter.

10. The sampling device for micro-nano plastics in water as described in claim 5, characterized in that, A first sealing ring is provided at the connection between the first connecting pipe and the arc-shaped pipe in the first filter to achieve the sealing of the connection; A second sealing ring is provided at the connection between the second connecting pipe and the arc-shaped pipe in the second filter to achieve the sealing of the connection; A third sealing ring is provided at the connection between the third connecting pipe and the arc-shaped pipe in the third filter to achieve the sealing of the connection.

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