PM2.5 (Particulate Matter 2.5) collecting device for measuring atmospheric aerosol

Abstract

The utility model provides a PM2.5 collection device used for atmospheric aerosol measurement, the PM2.5 collection device comprises a gas inlet assembly, a cutter, a sampling assembly, a flow adjusting device and a gas extractor, the gas inlet assembly comprises a gas inlet pipeline, and the gas inlet pipeline is connected to a gas inlet in the outer side of a conveyor from the interior of a machine body for gas transmission; the air inlet end of the cutter is connected with the air outlet end of the air inlet pipeline through a pipeline and is used for obtaining PM2.5; the gas inlet end of the sampling assembly is connected with the gas outlet end of the cutter through a gas pipeline, and the sampling assembly is used for collecting aerosol output from the cutter; the flow adjusting device is arranged below the sampling assembly, is connected with the gas outlet end of the sampling assembly through a pipeline and is used for adjusting the gas flow; the air extractor is arranged below the flow adjusting device and connected with the flow adjusting device through a pipeline. The collection device provided by the scheme can be used for continuously collecting atmospheric aerosol on a conveyor, is small in size, good in portability and high in flow adjustment flexibility, and facilitates measurement and analysis of the atmospheric aerosol.

Description

Technical Field

[0001] This utility model relates to the field of atmospheric environment detection technology, specifically a PM2.5 measurement device for atmospheric aerosols. 2.5 Data acquisition device. Background Technology

[0002] Atmospheric aerosols are suspended systems of liquid or solid particles in the air. They can directly or indirectly affect atmospheric radiation balance and climate, and can also cause air quality deterioration, reduced visibility, and impact human health. It is currently known that aerosols exhibit a significant vertical distribution, meaning that their physicochemical properties differ at different altitudes. Therefore, to study the impact of aerosols on the environment and climate, it is necessary to analyze the properties of aerosols, especially the vertical variations in their physical and chemical characteristics.

[0003] While ground-based methods for measuring aerosols are relatively well-established, effective detection instruments or methods are still lacking to obtain the characteristics of upper-air aerosols required for research. Vertical detection using aircraft platforms is one method for measuring atmospheric aerosol profiles, but current methods for sampling PM2.5 at high altitudes are limited. 2.5 The device is limited by portability, and the complexity of assembly and sampling processes.

[0004] To address the above problems, this invention provides an aircraft PM2.5 meter for measuring atmospheric aerosols. 2.5 A data acquisition device was developed to address the aforementioned issues. Utility Model Content

[0005] The purpose of this invention is to provide a PM2.5 solution for measuring atmospheric aerosols. 2.5 The acquisition device solves the aforementioned problems existing in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An aircraft PM2.5 meter for atmospheric aerosol measurement 2.5 The data acquisition device includes:

[0008] The air intake assembly includes an air intake duct for connecting from inside the fuselage to an air intake on the outside of the transport aircraft to facilitate the transfer of gas.

[0009] The cutter, whose air inlet is connected to the air outlet of the air inlet pipe via a pipe, is used to obtain PM. 2.5 ;

[0010] The sampling component has its air inlet connected to the air outlet of the cutter via an air delivery pipe, and is used to collect aerosols output from the cutter.

[0011] A flow regulating device is located below the sampling component and is connected to the gas outlet of the sampling component via a pipe, used to regulate the gas flow rate;

[0012] An air extraction device is located below the flow regulating device and is connected to the flow regulating device via a pipe.

[0013] Furthermore, the sampling assembly includes an upper membrane holder, a lower membrane holder, a membrane box, and a filter membrane;

[0014] Both the upper and lower membrane holders are funnel-shaped, used to guide and evenly disperse the sampled particles. Furthermore, the inner walls of the open ends of the upper and lower membrane holders are respectively provided with stepped surfaces for placing the membrane box.

[0015] The membrane box consists of three parts: a membrane box cover, a mesh support, and a membrane box base.

[0016] Both the membrane box cover and the membrane box base are designed to be annular, and the inner diameter of the membrane box cover is larger than the outer diameter of the membrane box base. A first annular protrusion is provided on the upper circumferential side of the membrane box cover, and a second annular protrusion is provided on the lower circumferential side of the membrane box base.

[0017] The mesh support is disposed on the upper end face of the membrane box base, the filter membrane is placed on the mesh support, and the membrane box cover is fastened to the membrane box base, so that the filter membrane and the mesh support are fixed between the lower end face of the first annular protrusion and the upper end face of the membrane box base.

[0018] Furthermore, the sidewalls of the upper and lower film holders are detachably connected by multiple latches.

[0019] Furthermore, the stepped surface of the upper film holder is provided with a first annular groove, and a first sealing ring is provided in the first annular groove for sealing the stepped surface of the upper film holder to the upper end surface of the film box cover.

[0020] Furthermore, the stepped surface of the lower membrane holder is provided with a second annular groove, and a second sealing ring is provided in the second annular groove for sealing the stepped surface of the lower membrane holder to the lower end surface of the membrane box base.

[0021] Furthermore,

[0022] The air intake pipe is made of arc-shaped steel pipe and is parallel to the fuselage of the transport aircraft.

[0023] Furthermore, the flow rate of the cutter is set to 92 L / min, and the cutting particle size is 2.5 μm;

[0024] The air outlet of the cutter is clamped to the air supply pipe by a clamping device.

[0025] Furthermore, the flow regulating device includes a regulating valve for controlling the ventilation cross section to regulate the flow rate.

[0026] Furthermore, the flow regulating device also includes:

[0027] The flow display module is connected to the regulating valve to display the real-time flow reading.

[0028] Furthermore,

[0029] The air extraction device includes an air pump, which is equipped with a power source and is connected to the flow regulating device via a pipeline.

[0030] The beneficial effects of adopting the above technical solution are as follows:

[0031] In this design, the air intake assembly includes an air intake pipe that connects from inside the fuselage to an air intake port on the outside of the transport aircraft for gas transmission; the air intake end of the cutter is connected to the air outlet end of the air intake pipe via a pipe to obtain PM2.5. 2.5 The sampling component's inlet is connected to the cutter's outlet via a gas pipeline to collect aerosols output from the cutter. A flow regulating device, located below the sampling component and connected to its outlet via a pipeline, regulates the gas flow rate. An extraction device, located below the flow regulating device and connected to it via a pipeline, further facilitates the measurement and analysis of atmospheric aerosols. This sampling device enables continuous collection of atmospheric aerosols on a transport aircraft. It is small in size, highly portable, and offers flexible flow rate adjustment, making it convenient for measuring and analyzing atmospheric aerosols. Attached Figure Description

[0032] Figure 1 This application uses PM for atmospheric aerosol measurement. 2.5 Schematic diagram of the data acquisition device;

[0033] Figure 2 This is a schematic diagram of the upper membrane support structure;

[0034] Figure 3 This is a schematic diagram of the lower membrane support structure;

[0035] Figure 4 This is a schematic diagram of the membrane box structure.

[0036] In the diagram, 10-inlet pipe; 20-cutter; 30-sampling component; 31-upper membrane support; 311-first sealing ring; 312-connecting groove; 32-lower membrane support; 321-second sealing ring; 33-membrane box; 331-membrane box cover; 332-mesh support; 333-membrane base; 334-first annular protrusion; 335-second annular protrusion; 40-flow regulating device; 41-regulating valve; 42-flow display module; 50-air extraction device; 60-gas delivery pipe; 70-lock. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0038] like Figures 1 to 4 As shown in the embodiment of this application, an aircraft PM2.5 collection device for atmospheric aerosol measurement is provided, including an air intake assembly, a cutter 20, a sampling assembly 30, a flow regulating device 40, and an air extraction device 50.

[0039] The air intake assembly includes an air intake pipe 10, which connects from inside the fuselage to an air intake on the outside of the transport aircraft for gas transmission.

[0040] The air inlet of the cutter 20 is connected to the air outlet of the air inlet pipe 10 through a pipe to obtain PM2.5;

[0041] The air inlet of the sampling component 30 is connected to the air outlet of the cutter 20 through the air supply pipe 60, and is used to collect the aerosol output from the cutter 20.

[0042] The flow regulating device 40 is located below the sampling component 30 and is connected to the gas outlet of the sampling component 30 through a pipe, and is used to regulate the gas flow rate;

[0043] The air extraction device 50 is located below the flow regulating device 40 and is connected to the flow regulating device 40 via a pipe.

[0044] The data collection device provided in this solution can continuously collect atmospheric aerosols on a transport aircraft. It is small in size, highly portable, and has a high degree of flexibility in flow rate adjustment, making it convenient for measuring and analyzing atmospheric aerosols.

[0045] In a preferred embodiment, the sampling assembly 30 includes an upper membrane holder 31, a lower membrane holder 32, a membrane box 33, and a filter membrane;

[0046] Both the upper membrane holder 31 and the lower membrane holder 32 are funnel-shaped and can be fastened together to guide and evenly disperse the sampled particles. Furthermore, the inner walls of the open ends of the upper membrane holder 31 and the lower membrane holder 32 are respectively provided with stepped surfaces for placing the membrane box 33.

[0047] The membrane box 33 consists of three parts: membrane box cover 331, mesh support 332, and membrane box base 333.

[0048] Both the membrane box cover 331 and the membrane box base 333 are designed as rings, and the inner diameter of the membrane box cover 331 is larger than the outer diameter of the membrane box base 333. A first annular protrusion 334 is provided on the upper circumferential side of the membrane box cover 331, and a second annular protrusion 335 is provided on the lower circumferential side of the membrane box base 333.

[0049] A mesh support 332 is disposed on the upper end face of the membrane box base 333. The filter membrane is placed on the mesh support 332. The membrane box cover 331 is fastened to the membrane box base 333, so that the filter membrane and the mesh support 332 are fixed between the lower end face of the first annular protrusion 334 and the upper end face of the membrane box base 333. Then, the membrane box 33 is placed on the stepped surface of the lower membrane holder 32, and the upper membrane holder 31 is fastened to the lower membrane holder 32. The stepped surface and side wall of the upper membrane holder 31 and the stepped surface and side wall of the lower membrane holder 32 are used together to achieve the fixing and sealing of the membrane box 33.

[0050] In the structure of the membrane box 33 described above, the side walls of the upper membrane support 31 and the lower membrane support 32 can be detachably connected by multiple latches 70.

[0051] For example, the fixing end of the latch 70 can be fixed to the side wall of the lower film holder 32, and a corresponding connecting groove 312 can be provided at the corresponding position on the side wall of the upper film holder 31, so that the fastening end of the latch 70 can be fastened in the connecting groove 312, thereby achieving the fixing effect between the upper film holder 31 and the lower film holder 32.

[0052] As a preferred embodiment, the stepped surface of the upper membrane holder 31 is provided with a first annular groove, and a first sealing ring 311 is provided in the first annular groove for sealing the stepped surface of the upper membrane holder 31 to the upper end surface of the membrane box cover 331.

[0053] As a preferred embodiment, the stepped surface of the lower membrane holder 32 is provided with a second annular groove, and a second sealing ring 321 is provided in the second annular groove for sealing the stepped surface of the lower membrane holder 32 to the lower end face of the membrane box base 333.

[0054] As a preferred implementation, the air intake pipe 10 is an arc-shaped steel pipe, parallel to the fuselage of the transport aircraft.

[0055] As a preferred embodiment, the flow rate of the cutter 20 is set to 92 L / min and the cutting particle size is 2.5 μm; the air outlet of the cutter 20 is clamped to the air supply pipe 60 by a clamping device.

[0056] In this embodiment, the flow regulating device 40 includes a regulating valve 41, which is used to control the ventilation section to regulate the flow rate.

[0057] In addition, the flow regulating device 40 also includes a flow display module 42, which is connected to the regulating valve 41 to display the real-time flow reading.

[0058] In this embodiment, the air extraction device 50 includes an air pump, which is equipped with a power supply and is connected to the flow regulating device 40 through a pipe.

[0059] The following describes the steps for using the aircraft PM2.5 collection device for atmospheric aerosol measurement provided in this embodiment:

[0060] 1) The air intake pipe 10 needs to be installed on the outside of the fuselage. When installing, attention should be paid to the fixed position, away from the location where the aircraft may emit particulate matter. The pipe between the air intake pipe 10 and the air intake end of the cutter 20 is a rubber hose. The rubber hose needs to be connected and fixed to the air intake pipe 10 with a sealing strip. Then, the other end of the rubber hose is connected to the air intake end of the cutter 20. The air outlet end of the cutter 20 is connected to the air intake end of the upper diaphragm support 31 with a curved air supply pipe 60. Then, the air outlet end of the lower diaphragm support 32 is connected to the flow regulating device 40, and then the flow regulating device 40 is connected to the air pump.

[0061] 2) After assembling the collection device, place the prepared filter membrane into the membrane box 33. If using a quartz membrane, ensure the rough side of the quartz membrane is facing upwards. When using, open the latch 70, place the assembled membrane box 33 face up on the lower membrane holder 32, then fasten the upper membrane holder 31 on top of the membrane box 33, and finally use the latch 708 to secure the lower membrane holder 32 and the upper membrane holder 31.

[0062] 3) Using the flow display module 42, adjust the control valve to ensure that the flow rate is adjusted to 92L / min, which corresponds to the flow rate of the cutter 20, and the cut particles have a diameter of 2.5 micrometers.

[0063] 4) The aircraft flies at a speed of 60-65 m / s. After reaching the designated location, connect the power supply to the air pump and begin sampling. After the sampling time is reached, disconnect the power supply to the air pump.

[0064] 5) After recording the sampling time and height, open the latch 70 of the membrane holder and take out the membrane box 33 where the sampling has been completed. Open the membrane box 33, remove the quartz membrane with tweezers and place it in the blank membrane box 33 for storage. After landing, send it to the laboratory to analyze the aerosol component concentration, replace the filter membrane, and prepare for the next sampling.

[0065] The isokinetic sampling flow rate of the target sampling area is calculated using the following formula:

[0066]

[0067] Q rs The sampling flow rate for the target area is expressed in L / min; d is the diameter of the sampling inlet, expressed in mm; V s Sampling flow rate, in m / s; unit: cm 2 ;t s The ambient temperature sampled inside the cabin is expressed in °C; t r The actual temperature sampled outside the cabin, in °C, can be measured by an external cabin temperature sensor; X sw Moisture content of the sampling environment, expressed as a percentage.

[0068] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An aircraft PM2.5 meter for measuring atmospheric aerosols. 2.5 The data acquisition device is characterized in that, include: The air intake assembly includes an air intake duct for connecting from inside the fuselage to an air intake on the outside of the transport aircraft to facilitate the transfer of gas. The cutter, whose air inlet is connected to the air outlet of the air inlet pipe via a pipe, is used to obtain PM. 2.5 ; The sampling component has its air inlet connected to the air outlet of the cutter via an air delivery pipe, and is used to collect aerosols output from the cutter. A flow regulating device is located below the sampling component and is connected to the gas outlet of the sampling component via a pipe, used to regulate the gas flow rate; An air extraction device is located below the flow regulating device and is connected to the flow regulating device via a pipe.

2. The aircraft PM2.5 sensor for atmospheric aerosol measurement according to claim 1 2.5 The data acquisition device is characterized in that, The sampling assembly includes an upper membrane holder, a lower membrane holder, a membrane box, and a filter membrane; Both the upper and lower membrane holders are funnel-shaped, used to guide and evenly disperse the sampled particles. Furthermore, the inner walls of the open ends of the upper and lower membrane holders are respectively provided with stepped surfaces for placing the membrane box. The membrane box consists of three parts: a membrane box cover, a mesh support, and a membrane box base. Both the membrane box cover and the membrane box base are designed to be annular, and the inner diameter of the membrane box cover is larger than the outer diameter of the membrane box base. A first annular protrusion is provided on the upper circumferential side of the membrane box cover, and a second annular protrusion is provided on the lower circumferential side of the membrane box base. The mesh support is disposed on the upper end face of the membrane box base, the filter membrane is placed on the mesh support, and the membrane box cover is fastened to the membrane box base, so that the filter membrane and the mesh support are fixed between the lower end face of the first annular protrusion and the upper end face of the membrane box base.

3. The aircraft PM2.5 sensor for atmospheric aerosol measurement according to claim 2 2.5 The data acquisition device is characterized in that, The upper and lower film holders are detachably connected by multiple latches.

4. The aircraft PM2.5 sensor for atmospheric aerosol measurement according to claim 2 2.5 The data acquisition device is characterized in that, The upper film holder has a first annular groove on its stepped surface, and a first sealing ring is provided in the first annular groove to seal the stepped surface of the upper film holder to the upper end surface of the film box cover.

5. The aircraft PM2.5 sensor for atmospheric aerosol measurement according to claim 2 2.5 The data acquisition device is characterized in that, The lower membrane holder has a second annular groove on its stepped surface, and a second sealing ring is provided in the second annular groove to seal the stepped surface of the lower membrane holder to the lower end face of the membrane box base.

6. The aircraft PM2.5 sensor for atmospheric aerosol measurement according to claim 1 2.5 The data acquisition device is characterized in that, The air intake pipe is made of arc-shaped steel pipe and is parallel to the fuselage of the transport aircraft.

7. The aircraft PM2.5 sensor for atmospheric aerosol measurement according to claim 1 2.5 The data acquisition device is characterized in that, The flow rate of the cutter is set to 92 L / min, and the cutting particle size is 2.5 μm; The air outlet of the cutter is clamped to the air supply pipe by a clamping device.

8. The aircraft PM2.5 sensor for atmospheric aerosol measurement according to claim 1 2.5 The data acquisition device is characterized in that, The flow regulating device includes a regulating valve, which is used to control the ventilation section to regulate the flow rate.

9. The aircraft PM2.5 sensor for atmospheric aerosol measurement according to claim 8 2.5 The data acquisition device is characterized in that, The flow regulating device further includes: The flow display module is connected to the regulating valve to display the real-time flow reading.

10. The aircraft PM2.5 sensor for atmospheric aerosol measurement according to claim 1 2.5 The data acquisition device is characterized in that, The air extraction device includes an air pump, which is equipped with a power source and is connected to the flow regulating device via a pipeline.

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