A microplastics filtration device in a toy

Abstract

This utility model discloses a microplastic filtration device for toys, relating to the technical field of environmental monitoring and analysis. It includes: a liquid cup, a composite filtration structure, a waste liquid bottle, a vacuum pump, a waste liquid pipe, and a switch valve. The top of the liquid cup has a detachable pre-filtration structure, which includes a stainless steel filter screen with a pore size of 4000-6000 μm. The composite filtration structure is sealed and connected to the bottom of the liquid cup. This composite filtration structure includes a micro-stainless steel filter screen with a pore size of 10-30 μm and a diameter of 1.5-2.5 mm, embedded in glass fiber filter paper. The glass fiber filter paper has an outlet at its lower part. The waste liquid bottle is located below the composite filtration structure and is sealed and connected to its outlet. The vacuum pump is connected to the top of the waste liquid bottle. One end of the waste liquid pipe is connected to the bottom of the waste liquid bottle, and the other end is connected to waste liquid treatment equipment. The switch valve is located on the waste liquid pipe to control its on / off state, effectively improving the accuracy and reliability of the detection.

Description

Technical Field

[0001] This utility model relates to the technical field of environmental monitoring and analysis, and in particular to a microplastic filtration device for toys. Background Technology

[0002] Existing filtration devices have significant shortcomings in the detection and analysis of microplastics in toys. Conventional filtration devices use a 47mm diameter filter membrane. After trapping microplastics, transferring them to a 3-4mm diameter sample cup for subsequent thermal pyrolysis-gas chromatography-mass spectrometry analysis is extremely cumbersome and results in significant sample loss. Discarding the liquid from the waste bottle requires removing numerous components, a complex process that easily introduces contaminants, affecting the accuracy of subsequent microplastic detection and analysis. These problems hinder the efficient and accurate detection of microplastics in toys. Utility Model Content

[0003] The purpose of this invention is to provide a microplastic filtration device for toys, effectively solving the problems of cumbersome operation, significant sample loss, and easy introduction of contaminants in the existing technology during microplastic filtration and subsequent transfer. It ensures efficient and accurate sample filtration and collection before detecting microplastics in toys, providing high-quality samples for subsequent pyrolysis-gas chromatography-mass spectrometry analysis, thus improving the accuracy and reliability of the detection.

[0004] To achieve the above objectives, this utility model provides the following solution:

[0005] This utility model provides a microplastic filtration device for toys, comprising: a liquid cup, a composite filtration structure, a waste liquid bottle, a vacuum pump, a waste liquid pipe, and a switch valve. The top of the liquid cup is equipped with a detachable pre-filtration structure, which includes a stainless steel filter screen with a pore size of 4000-6000 μm for trapping large particles. The composite filtration structure is sealed and connected to the bottom of the liquid cup to receive the liquid after pre-filtration. The composite filtration structure includes a micro-stainless steel filter screen with a pore size of 10-30 μm. The diameter of the filter element is 1.5-2.5 mm and it is embedded in glass fiber filter paper. The glass fiber filter paper has an outlet at the bottom. The waste liquid bottle is located below the composite filter structure and is sealed and connected to the outlet of the composite filter structure to collect the filtered waste liquid. The vacuum pump is connected to the top of the waste liquid bottle to provide the negative pressure required for filtration. One end of the waste liquid pipe is connected to the bottom of the waste liquid bottle and the other end is connected to the waste liquid treatment equipment. The switch valve is located on the waste liquid pipe to control the opening and closing of the waste liquid pipe.

[0006] Preferably, a metal wire with a length of 1-3 cm is fixedly connected to the miniature stainless steel filter screen to assist in gripping and transferring the miniature stainless steel filter screen.

[0007] Preferably, the composite filtration structure further includes a glass frit core, which is disposed below the glass fiber filter paper to support the filter material and allow the liquid to pass through uniformly.

[0008] Preferably, the pore size of the primary filter structure is 5000 μm.

[0009] Preferably, the micro stainless steel filter screen has a pore size of 20 μm and a diameter of 2 mm.

[0010] Preferably, the switching valve is a pinch valve or a three-way valve.

[0011] Preferably, the connection between the primary filter structure and the liquid cup is a threaded connection, and a handle is provided on the top. The handle is made of PP material and is integrally injection molded with anti-slip texture on the surface.

[0012] Preferably, the outer shell of the composite filter structure is made of polytetrafluoroethylene, and an annular silicone sealing ring is provided at the contact part between its inner wall and the glass fiber filter paper.

[0013] Preferably, the waste liquid bottle is made of transparent borosilicate glass with a thickness of 2-3 mm.

[0014] Preferably, the vacuum pump adopts an oil-free diaphragm design, and its connecting pipe to the waste liquid bottle is made of rubber.

[0015] The present invention achieves the following technical advantages over the prior art:

[0016] This invention provides a microplastic filtration device for toys, featuring a detachable pre-filter structure for easy cleaning and replacement of the stainless steel filter screen, ensuring long-term stability of the pre-filtration effect. The stainless steel filter screen, with a pore size of 4000-6000μm, effectively intercepts large particles, preventing them from clogging or damaging subsequent filtration structures. It also reduces the burden on the subsequent composite filtration structure, improving the overall durability and filtration efficiency of the filtration device. A micro-stainless steel filter screen with a specific pore size and diameter is embedded in glass fiber filter paper. This composite structure ensures effective microplastic retention while balancing filter strength and filtration area, thus improving filtration accuracy. An outlet design at the bottom of the glass fiber filter paper ensures smooth discharge of the filtered liquid, preventing liquid accumulation inside the composite filtration structure and ensuring continuous and stable filtration. A vacuum pump connected to the top of the waste liquid bottle provides negative pressure, effectively propelling the liquid in the liquid cup through the pre-filter and composite filtration structures, achieving a rapid and stable filtration process. Appropriate negative pressure ensures that particles and microplastics of different sizes are trapped and filtered according to the designed process, improving filtration efficiency and reducing the time cost required for filtration operations. The on / off valve allows for flexible control of the waste liquid pipe's opening and closing; it opens when waste liquid needs to be discharged and closes during filtration to ensure the system's sealing and stability. This flexible control capability avoids the pollution risks caused by complex operations during waste liquid disposal in conventional devices, improves operational convenience and hygiene, and prevents waste liquid leakage from harming the environment and operators when it is not needed. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the microplastic filtration device in toys provided by this utility model;

[0019] Figure 2 for Figure 1 A sectional view of the structure at point A in the middle;

[0020] In the diagram: 1. Liquid cup; 2. Primary filter structure; 3. Composite filter structure; 4. Miniature stainless steel filter screen; 5. Waste liquid bottle; 6. Vacuum pump; 7. Waste liquid pipe; 8. Switch valve; 9. Metal wire. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] The purpose of this invention is to provide a microplastic filtration device for toys, effectively solving the problems of cumbersome operation, significant sample loss, and easy introduction of contaminants in the existing technology during microplastic filtration and subsequent transfer. It ensures efficient and accurate sample filtration and collection before detecting microplastics in toys, providing high-quality samples for subsequent pyrolysis-gas chromatography-mass spectrometry analysis, thus improving the accuracy and reliability of the detection.

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] This utility model provides a microplastic filtration device for toys, such as... Figures 1-2As shown, the system includes: a liquid cup 1, a composite filtration structure 3, a waste liquid bottle 5, a vacuum pump 6, a waste liquid pipe 7, and a switch valve 8. The top of the liquid cup 1 is equipped with a detachable pre-filtration structure 2, which includes a stainless steel filter screen with a pore size of 4000-6000μm for trapping large particles. The composite filtration structure 3 is sealed and connected to the bottom of the liquid cup 1 to receive the liquid after pre-filtration. The composite filtration structure 3 includes a micro stainless steel filter screen 4 with a pore size of 10-30μm. The diameter of the micro filter screen is... A 1.5-2.5mm pore size is embedded in glass fiber filter paper, with an outlet at the bottom of the glass fiber filter paper. A waste liquid bottle 5 is positioned below the composite filter structure 3 and is sealed and connected to the outlet of the composite filter structure 3 to collect the filtered waste liquid. A vacuum pump 6 is connected to the top of the waste liquid bottle 5 to provide the negative pressure required for filtration. One end of the waste liquid pipe 7 is connected to the bottom of the waste liquid bottle 5, and the other end is connected to the waste liquid treatment equipment. A switch valve 8 is installed on the waste liquid pipe 7 to control its opening and closing. A removable primary filter structure 2 is provided to facilitate cleaning and replacement of the stainless steel filter screen, ensuring the long-term stability of the primary filtration effect. The stainless steel filter screen with a pore size of 4000-6000μm can effectively intercept large particles, preventing these larger particles from clogging or damaging subsequent filtration structures, while reducing the burden on the subsequent composite filter structure 3, thus improving the durability and filtration efficiency of the entire filtration device. A micro-stainless steel filter screen 4 with specific pore size and diameter is embedded in glass fiber filter paper. This composite structure ensures effective retention of microplastics while balancing the strength and filtration area of ​​the filter screen, thus improving filtration accuracy. The outlet design at the bottom of the glass fiber filter paper ensures smooth discharge of the filtered liquid, preventing liquid accumulation inside the composite filter structure 3 and ensuring continuous and stable filtration. A vacuum pump 6, connected to the top of the waste liquid bottle 5, provides negative pressure, effectively propelling the liquid in the liquid cup 1 through the primary filtration structure 2 and the composite filter structure 3, achieving a rapid and stable filtration process. Appropriate negative pressure ensures that particles and microplastics of different sizes are retained and filtered according to the designed process, improving filtration efficiency and reducing the time cost required for filtration operations. A switching valve 8 flexibly controls the opening and closing of the waste liquid pipe 7, opening when waste liquid needs to be discharged and closing during filtration to ensure the system's sealing and stability. This flexible control capability avoids the pollution risks caused by the complex operation of conventional equipment during waste liquid discharge, improves the convenience and hygiene of operation, and prevents waste liquid leakage from causing harm to the environment and operators when waste liquid is not required to be discharged.

[0025] In a preferred embodiment, a metal wire 9, 1-3 cm in length, is fixedly connected to the miniature stainless steel filter 4. This wire assists in gripping and transferring the miniature stainless steel filter 4. The fixed metal wire 9 effectively solves the problem of difficulty in gripping and transferring the miniature filter in actual operation, reducing the risk of filter damage due to improper operation during gripping, and improving the convenience and accuracy of operation. The suitable length of the metal wire 9 (1-3 cm) allows operators to easily grip the filter in different operating scenarios and accurately transfer it to the metal sample cup of the pyrolysis-gas chromatography-mass spectrometry instrument, reducing the loss of microplastics during transfer and improving the accuracy of subsequent analysis.

[0026] In a preferred embodiment, the composite filter structure 3 further includes a glass frit core disposed below the glass fiber filter paper. The glass frit core supports the filter media and ensures uniform liquid flow. It provides stable support to the glass fiber filter paper, preventing deformation or damage during filtration due to liquid pressure, thus ensuring the stability and reliability of the composite filter structure 3. Simultaneously, it ensures uniform liquid flow, avoiding uneven filtration caused by excessively fast or slow local flow rates, improving the overall filtration effect and the accuracy of microplastic collection. This results in a more uniform distribution of microplastics on the filter screen, which is beneficial for subsequent analytical operations.

[0027] In a preferred embodiment, the pore size of the primary filter structure 2 is 5000 μm. This 5000 μm pore size is optimized to achieve a good balance between trapping large particles and ensuring smooth liquid flow. It can effectively intercept most large particles with a diameter greater than 5000 μm, reducing interference from large particles on the subsequent composite filter structure 3, while not excessively hindering the flow of liquid, ensuring the working efficiency of the entire filtration device, and improving the smoothness and stability of the filtration process.

[0028] In a preferred embodiment, the micro stainless steel filter 4 has a pore size of 20 μm and a diameter of 2 mm. This size and specification of the micro stainless steel filter 4 has a good retention effect on microplastics in toys, and can accurately collect microplastics of the target particle size, greatly improving the collection efficiency of microplastics in toys. At the same time, this size design is well compatible with the metal sample cup of the thermal pyrolysis-gas chromatography-mass spectrometry instrument to be used subsequently, which facilitates the direct entry of the filter and the sample as a whole into the sample cup for analysis, avoiding complicated sample transfer operations, further reducing sample loss and improving analytical accuracy.

[0029] In a preferred embodiment, the switching valve 8 is either a pinch valve or a three-way valve, each possessing unique advantages in controlling the on / off state of the waste liquid pipe 7. The pinch valve has a simple structure and is easy to operate, effectively clamping the waste liquid pipe 7 to prevent waste liquid flow; the three-way valve, on the other hand, can flexibly control the flow direction of the waste liquid, not only achieving waste liquid discharge but also potentially possessing other functions, such as controlling different flow directions at different processing stages. Both can meet the requirements for controlling the on / off state of the waste liquid pipe 7, improving the flexibility of selecting the switching valve 8 to adapt to different application scenarios and user needs.

[0030] In a preferred embodiment, the primary filter structure 2 is connected to the liquid cup 1 via a threaded connection. A handle is also provided at the top, made of one-piece injection-molded PP material with anti-slip textured surface. The threaded connection ensures a secure and reliable connection between the primary filter structure 2 and the liquid cup 1, guaranteeing a tight seal while facilitating disassembly and installation by the operator. The one-piece injection-molded PP handle possesses good strength and durability, and the anti-slip textured surface increases friction when the operator lifts the primary filter structure 2, preventing parts from slipping and falling or being damaged, improving operational safety, reducing damage to the filtration device caused by accidental factors, and thus extending the overall lifespan of the device.

[0031] In a preferred embodiment, the outer shell of the composite filter structure 3 is made of polytetrafluoroethylene (PTFE), and an annular silicone sealing ring is provided at the contact point between its inner wall and the glass fiber filter paper. The PTFE outer shell has good chemical stability, corrosion resistance, and self-lubricating properties, which can protect the internal components of the composite filter structure 3 from chemical corrosion and external environmental influences, extending the service life of the device. The annular silicone sealing ring at the contact point between the inner wall and the glass fiber filter paper further enhances the sealing performance of the composite filter structure 3, preventing liquid leakage from the gap between the filter paper and the outer shell during the filtration process, ensuring the accuracy and reliability of filtration, and avoiding the impact of leakage problems on the collection and detection results of microplastics.

[0032] In a preferred embodiment, the waste liquid bottle 5 is made of transparent borosilicate glass with a body thickness of 2-3 mm. Transparent borosilicate glass possesses excellent chemical and thermal stability, strong acid and alkali resistance, and is unlikely to react chemically with substances in the waste liquid, ensuring that the waste liquid will not deteriorate due to reactions between the material and chemical components, thus affecting subsequent analysis or discharge treatment. Simultaneously, the transparent material allows operators to directly observe the liquid level inside the waste liquid bottle 5, promptly identifying its fullness and rationally planning waste liquid discharge operations. The appropriate bottle thickness (2-3 mm) ensures the structural strength of the waste liquid bottle 5, enabling it to withstand certain pressure without breaking, ensuring the safety of stored waste liquid.

[0033] In a preferred embodiment, the vacuum pump 6 employs an oil-free diaphragm design, and its connection pipe to the waste liquid bottle 5 is made of rubber. The oil-free diaphragm vacuum pump 6 provides stable negative pressure and avoids the risk of sample or equipment contamination due to oil, ensuring the purity of the entire filtration process. This is particularly suitable for environmentally demanding operations such as detecting microplastics in toys. The rubber connection pipe has good flexibility and sealing properties, effectively connecting the vacuum pump 6 and the waste liquid bottle 5, adapting to the connection requirements of different device layouts and operating conditions. Simultaneously, the rubber material is corrosion-resistant and not prone to aging or damage, maintaining good performance over long-term use, ensuring a stable and reliable connection between the vacuum pump 6 and the waste liquid bottle 5, and maintaining the long-term stable operation of the filtration device.

[0034] The method of using the microplastic filtering device in the above-mentioned toy is as follows:

[0035] 1. Equipment Preparation

[0036] Cleaning components: Thoroughly clean the liquid cup 1, the stainless steel filter screen in the primary filtration structure 2, the glass fiber filter paper and miniature stainless steel filter screen 4 in the composite filtration structure 3, the glass frit, and the waste liquid bottle 5 using a suitable cleaning agent and distilled water to remove any remaining impurities, dust, etc., ensuring that all components are clean and free of contamination. Then, place the cleaned components in a clean and dry environment to air dry.

[0037] Assembly equipment:

[0038] Install the primary filter structure 2: Install a stainless steel filter screen with a pore size of 5000μm into the primary filter structure 2, and then install the primary filter structure 2 onto the top of the liquid cup 1 via threaded connection. During installation, ensure that the threads are tightened to guarantee a good seal and no leakage, and then check that the top handle is securely installed.

[0039] Install composite filter structure 3: Embed a 2mm diameter, 20μm pore size micro stainless steel filter screen 4 into the glass fiber filter paper, and install a glass frit below the glass fiber filter paper. Ensure it is properly installed and stably placed within composite filter structure 3, so that the micro stainless steel filter screen 4 and glass fiber filter paper are in the correct positions to perform their filtering function correctly. Seal composite filter structure 3 to the bottom of liquid cup 1, ensuring a leak-free seal at the connection.

[0040] Connecting other components: Seal and connect the waste liquid bottle 5 below the outlet of the composite filter structure 3. Then, use a rubber connecting pipe to connect the oil-free diaphragm vacuum pump 6 to the top of the waste liquid bottle 5. Finally, install a clamp valve or three-way valve as an on / off valve 8 on the waste liquid pipe 7, which is connected to the bottom of the waste liquid bottle 5 at one end and to the waste liquid treatment equipment at the other end.

[0041] 2. Toy sample processing and filtration

[0042] Adding sample solution: The sample solution obtained after pretreatment such as dissolving the toy is slowly added to liquid cup 1. At this time, large particles with a diameter greater than 5000μm will be trapped by the stainless steel filter screen in the primary filtration structure 2.

[0043] Initiate the filtration process: Close the switch valve 8 on the rubber waste liquid pipe 7 and turn on the vacuum pump 6. The negative pressure generated by the vacuum pump 6 forces the toy sample solution in the liquid cup 1 through the primary filtration structure 2 and the composite filtration structure 3 in sequence, before entering the waste liquid bottle 5. During this process, microplastics larger than 20μm will be trapped on the micro stainless steel filter screen 4 in the composite filtration structure 3.

[0044] Continuous Addition and Monitoring: During the filtration process, the toy sample solution is continuously and slowly added to liquid cup 1. Simultaneously, the operator observes the liquid level in waste liquid bottle 5. Since waste liquid bottle 5 is made of transparent borosilicate glass, the liquid level is clearly visible. When waste liquid bottle 5 is observed to be nearly full, the vacuum pump 6 is turned off, and then the switch valve 8 is opened. At this time, the liquid in waste liquid bottle 5 flows into the waste liquid treatment equipment or designated location such as a water tank through waste liquid pipe 7 under the influence of gravity.

[0045] 3. Sample transfer and analysis

[0046] Filter Removal: After all samples have been filtered, carefully use metal tweezers to remove the 1-3cm long metal wire 9 fixedly connected to the miniature stainless steel filter 4 in the composite filter structure 3. The presence of the metal wire 9 facilitates the removal operation, avoiding potential damage or accidental fall-down of the miniature stainless steel filter 4 if directly grasped, ensuring the filter is removed intact.

[0047] Transfer the filter to the sample cup: Accurately place the micro-stainless steel filter 4 with microplastics into the metal sample cup of the thermal pyrolysis-gas chromatography-mass spectrometry instrument.

[0048] Subsequent processing: After placing the filter screen into the metal sample cup, use a suitable tool to cut the metal wire 9 short to prevent it from interfering with the instrument analysis. This completes the sample preparation. The microplastics collected on the filter screen can then be qualitatively and quantitatively analyzed using a thermal pyrolysis-gas chromatography-mass spectrometry (TCMS) system, and the organic components within the microplastics can be determined.

[0049] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A microplastics filtration device in a toy, characterized by: include: Liquid cup (1), the top of which is provided with a detachable primary filter structure (2), the primary filter structure (2) including a stainless steel filter screen with a pore size of 4000-6000µm, for trapping large particles; A composite filter structure (3) is sealed and connected to the bottom of the liquid cup (1) for receiving the liquid after primary filtration; the composite filter structure (3) includes a micro stainless steel filter screen (4) with a pore size of 10-30µm and a diameter of 1.5-2.5mm, which is embedded in glass fiber filter paper and has an outlet at the bottom of the glass fiber filter paper; Waste liquid bottle (5) is placed below the composite filter structure (3) and is sealed and connected to the outlet of the composite filter structure (3) to collect the filtered waste liquid. A vacuum pump (6) is connected to the top of the waste bottle (5) to provide the negative pressure required for filtration; Waste liquid pipe (7), one end of which is connected to the bottom of the waste liquid bottle (5) and the other end is connected to the waste liquid treatment equipment; and A switching valve (8) is provided on the waste liquid pipe (7) to control the opening and closing of the waste liquid pipe (7).

2. The microplastics filtration device in toys according to claim 1, wherein: A metal wire (9) is fixedly connected to the miniature stainless steel filter (4). The length of the metal wire (9) is 1-3cm, which is used to assist in clamping and transferring the miniature stainless steel filter (4).

3. The microplastics filtration device in toys according to claim 1, wherein: The composite filtration structure (3) also includes a glass frit, which is located below the glass fiber filter paper to support the filter material and allow the liquid to pass through evenly.

4. The microplastics filtration device in toys according to claim 1, wherein: The pore size of the primary filter structure (2) is 5000µm.

5. The microplastics filtration device in toys according to claim 1, wherein: The micro stainless steel filter (4) has a pore size of 20µm and a diameter of 2mm.

6. The microplastics filtration device in toys according to claim 1, wherein: The switching valve (8) is a pinch valve or a three-way valve.

7. The microplastic filtration device for toys according to claim 1, characterized in that: The connection between the primary filter structure (2) and the liquid cup (1) is a threaded connection. The top of the cup is also provided with a handle. The handle is made of PP material and is integrally injection molded with anti-slip texture on the surface.

8. The microplastics filtration device in toys according to claim 1, wherein: The outer shell of the composite filter structure (3) is made of polytetrafluoroethylene, and an annular silicone sealing ring is provided at the contact part between its inner wall and the glass fiber filter paper.

9. The microplastics filtration device in toys according to claim 1, wherein: The waste liquid bottle (5) is made of transparent borosilicate glass with a body thickness of 2-3 mm.

10. The microplastics filtration device in toys according to claim 1, wherein: The vacuum pump (6) adopts an oil-free diaphragm design, and its connecting pipe to the waste liquid bottle (5) is made of rubber.

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