Experimental device for actively sampling suspended micro-plastics in indoor air

Abstract

The utility model discloses an experimental device for actively sampling suspended micro-plastics in indoor air, which comprises a shell, and an air inlet system, a micro-plastic particle filtering and collecting device for sampling, an air circulation power device, an air outlet system and a base which are arranged in sequence, and the air circulation power device is arranged at the bottom of the micro plastic particle filtering and collecting device. The air circulation power device is started to form air circulation in the whole room, micro-plastics in the air enter the device from the uppermost air inlet system along with air flow and are filtered by the micro-plastic filtering and collecting device, the micro-plastics are intercepted, sampled and collected on the filter screen, and the filtered air is discharged through the bottom air outlet system. Filtering and sampling are completed. By means of the air circulation power device, continuous active sampling can be achieved, the sampling detection error is small, the data detection precision is high, and meanwhile air purification is achieved in the air circulation process by arranging multiple layers of filter discs.

Description

TECHNICAL FIELD

[0001] The utility model relates to microplastic detection technical field, especially in a kind of for indoor air suspended microplastic active sampling experimental device. BACKGROUND

[0002] Plastic pollution is one of the most pressing environmental problems in the 21st century, and human activities have made microplastics widely exist in the atmosphere, water and land. Microplastics, which are broken down into small particles, seriously affect the environment and harm ecological safety.

[0003] There are usually two ways to sample microplastics in the atmosphere in the prior art: (1) passive deposition collection, such as disclosed in the article "Atmospheric microplastics: A review on current status and perspectives";

[0004] (2) integrated mechanical equipment sampling, such as the air microplastic detection device disclosed in the utility model patent with publication number CN216051267U, which includes an environmental data monitoring module, an atmospheric sample collection module, a sample processing module, and a controller. The output of the controller is connected to the input of the atmospheric sample collection module to control the operation of the atmospheric sample collection module for sample collection. The atmospheric sample collection module includes an air suction assembly, a liquid storage assembly, a sample collection assembly arranged on the outside of the case, and several communication pipelines.

[0005] The passive deposition collection sampling method requires a long sampling time and is greatly affected by the external environment, which cannot ensure the accuracy of the sampling and the accuracy of the sampling. At the same time, due to the small particle size, slow settling, and easy suspension of microplastics suspended in indoor air, the passive deposition collection sampling method will result in large sampling errors. While the integrated large sampling device has high sampling accuracy, it has high use cost and is difficult to transport and carry, which is not suitable for daily experimental sampling. UTILITY MODEL CONTENT

[0006] The utility model aims to provide a continuous active sampling experimental device for indoor air suspended microplastics, which is efficient, reliable, simple and light in structure.

[0007] Technical solution: The utility model discloses an experimental device for indoor air suspended microplastics, which comprises a shell, an air inlet system, a microplastic particle filtering and collecting device for sampling, an air circulation power device, an air outlet system and a base arranged in the shell in sequence. The air circulation power device is arranged at the bottom of the microplastic particle filtering and collecting device.

[0008] Further, the air inlet system comprises a detachable cross-shaped baffle for blocking horizontal movement of the microplastics and an air inlet wide mouth in communication with the microplastic particle filtering and collecting device.

[0009] Further, the microplastic particle filtering and collecting device is a filtering channel provided with multiple layers of filter screens, one end of the filtering channel being in communication with the air inlet system and the other end being in communication with the air circulation power device.

[0010] Further, the air circulation power device comprises blades and a driving motor, and the blades are arranged at the bottom of the microplastic particle filtering and collecting device.

[0011] Further, the air outlet system comprises a plurality of guide channels and air outlets arranged on the base.

[0012] Further, the air inlet system, the microplastic particle filtering and collecting device for sampling, the air circulation power device and the air outlet system are detachably connected with the shell.

[0013] Further, the shell and the base are made of stainless steel.

[0014] Further, the multiple layers of filter screens are made of nylon, and nylon filter screens with a mesh size of 400 or less can be selected according to requirements to collect microplastic particles with a size of more than 40 microns.

[0015] Further, the guide channels and the air outlets are both provided with four, and the air outlets are evenly arranged on the base.

[0016] Further, the guide channels and the air outlets are both made of stainless steel.

[0017] Technical principle: turning on the air circulation power device to form air circulation in the whole room, and the microplastics in the air flow into the device from the air inlet system at the top of the device, and then pass through the microplastic filtering and collecting device to filter and collect the microplastics on the filter screens, and the filtered gas is discharged through the air outlet system at the bottom to complete the filtering and sampling.

[0018] Advantages: compared with the prior art, the air circulation power device is used to realize continuous active sampling, the sampling detection error is small, the data detection precision is high, and multiple layers of filter screens are arranged to realize air purification in the air circulation process. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a front view of the utility model;

[0020] Figure 2The utility model discloses a top view of the utility model

[0021] Figure 3 The utility model discloses a blade schematic in the embodiment of the utility model Figure 1

[0022] Figure 4 The utility model discloses a blade schematic in the embodiment of the utility model Figure 2 DETAILED DESCRIPTION

[0023] The technical scheme of the utility model will be further described below with the drawings.

[0024] As Figure 1 ​​As shown, the utility model provides a kind of for indoor air suspended micro plastic active sampling experimental device, including stainless steel shell and the air intake system 1 of sequentially arranged, micro plastic particle filtering and collecting device 2 for sampling, air circulation power device 3, air outlet system 4 and base 5.The air intake system 1 is made of cross baffle 11 and air inlet 12, all are stainless steel material, cross baffle 11 is located above air inlet 12, cross baffle 11 can be detached, its height is 30cm, length is 100cm, for blocking interception horizontal direction moving micro plastic particle, make it enter air inlet 12, the opening diameter of air inlet 12 is 100cm, the lower opening diameter is 50cm, inclination angle is 45 °, and lower opening is connected with micro plastic particle filtering and collecting device.Micro plastic filtering and collecting device 2 is made of filter channel 22 and filter screen 21, filter channel 22 is stainless steel material, four filter screen mounting points are arranged inside, can be selected according to sampling needs the number of filter screen installed, filter screen 21 is nylon breathable filter screen, can select 100 mesh to 400 mesh according to sampling demand, so as to reach the screening effect of different particle size micro plastics.400 mesh filter screen corresponding aperture is 35 microns, 100 mesh filter screen corresponding aperture is 150 microns, micro plastic is defined as the plastic particle of size 1 μm-5mm, and the most common micro plastic size floating in air is 50-300 microns, and the device can select ring filter screen aperture as required, and the 100 mesh to 400 mesh filter screen in aperture can effectively intercept target micro plastic particle.The whole filtering and collecting device part can be taken out from upper end air inlet 12, and sample collection and filter screen replacement are carried out.Air circulation power device 3 is made of blade 31 and motor 32, motor is connected with 220V alternating current, power 50W, when not installing filter screen, wind speed can reach 5.5m / s, realizes 20m air supply distance.5.5m / s of the embodiment is the average wind speed that DC variable frequency motor used in air circulation fan on market can realize, and air supply distance 20m is the maximum air supply distance, after installing filter screen, effective air supply distance is generally 10-15m.Air supply distance can also be different according to different motor models, and according to the specific use environment (15x15m indoor environment within area) of the device, the smaller indoor area, the longer air supply distance, and the better the collection effect of the device.Air supply distance is also related to motor type and blade number and inclination angle, and the motor and blade used in common air circulation fan on market can realize 20m air supply distance. Figure 2 As shown, air outlet system 4 is made of 4 guide channels 41 and 4 air outlets 42, all are stainless steel material, and air outlet 42 is evenly distributed above base 5 in four different directions.Base 5 is the cylindrical structure of 5cm height and 100cm diameter, and is stainless steel material, to provide stable support for the whole device.

[0025] Before sampling, according to the sampling needs, the required specification filter screen 21 is installed into the filter channel 22 of the microplastic filtering and collecting device, and then the microplastic filtering and collecting device 2 is installed into the shell, and the cross baffle 11 above the air inlet 12 is assembled. During sampling, the assembled experimental device is placed at the central position of the room to be sampled, the power supply of the air circulation power device 3 is turned on, the air circulation system power device 3 composed of blades and motors is used together with the flow guide channel and air outlet of the air outlet system to form a spiral air flow propulsion device similar in principle to the air circulation fan. The device can output strong and concentrated air beams in four different directions from the four air outlets of the base to stir the indoor air, and flow upward after colliding with the wall. The present embodiment is an experimental device for active sampling of microplastics suspended in indoor air, which is mainly placed in the center of the room, in a closed environment, with high air flow rate at the bottom and low pressure, and the air at the upper part enters from the top air inlet device under the action of pressure, forming air circulation. The microplastic particles in the air float in the air after being disturbed by air circulation, and are more likely to enter from the air inlet channel along with the air flow, thereby realizing effective air inlet and air circulation. The microplastics in the air flow into the device from the top air inlet system 1 of the device, and then pass through the microplastic filtering and collecting device 2 for filtering, so as to intercept and collect the microplastics on the filter screen 21. The gas is discharged from the four air outlets 42 of the four flow guide channels 41 at the bottom in four directions, forming indoor air circulation, thereby realizing continuous and stable sampling. After sampling, the power supply is cut off, the microplastic filtering and collecting device 2 is taken out from the top of the device, and then the filter screen 21 is taken out for sample processing.

Claims

1. An experimental device for active sampling of suspended microplastics in indoor air, characterized in that: The invention comprises a housing and an air intake system (1) arranged in sequence from top to bottom in the housing, a microplastic particle filtering and collecting device (2) for sampling, an air circulation power device (3), an air outlet system (4) and a base (5), wherein the air circulation power device (3) comprises blades (31) and a drive motor (32), and the blades (31) are arranged below the microplastic particle filtering and collecting device (2).

2. An experimental device for active sampling of suspended microplastics in indoor air according to claim 1, characterized in that: The air intake system (1) comprises a detachable cross baffle (11) for blocking the horizontal movement of microplastics and an air intake opening (12), wherein the air intake opening (12) is connected to a microplastic particle filtering and collecting device (2).

3. The experimental device for active sampling of suspended microplastics in indoor air according to claim 1, characterized in that: The microplastic particle filtering and collecting device (2) is a filtering channel (22) equipped with a multi-layer filter screen (21), one end of the filtering channel (22) is connected to the air intake system (1), and the other end is connected to the air circulation power device (3).

4. The experimental device for active sampling of suspended microplastics in indoor air according to claim 1, characterized in that: The air outlet system (4) comprises a plurality of flow guide channels (41) and air outlets (42), and the air outlets (42) are arranged on the base (5).

5. The experimental device for active sampling of suspended microplastics in indoor air according to claim 1, characterized in that: The air intake system (1), the microplastic particle filtering and collecting device (2) for sampling, the air circulation power device (3), and the air outlet system (4) are detachably connected to the housing.

6. The experimental device for active sampling of suspended microplastics in indoor air according to claim 1, characterized in that: The housing and the base (5) are made of stainless steel.

7. The experimental device for active sampling of suspended microplastics in indoor air according to claim 3, characterized in that: The multi-layer filter screen (21) is made of nylon.

8. The experimental device for active sampling of suspended microplastics in indoor air according to claim 4, characterized in that: There are four guide channels (41) and four air outlets (42), and the air outlets (42) are evenly distributed on the base (5).

9. The experimental device for active sampling of suspended microplastics in indoor air according to claim 8, characterized in that: The guide channel (41) and the air outlet (42) are both made of stainless steel.

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