CN113310754A - Atmospheric particulate continuous classification wet sampling device - Google Patents
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- CN113310754A CN113310754A CN202110644516.XA CN202110644516A CN113310754A CN 113310754 A CN113310754 A CN 113310754A CN 202110644516 A CN202110644516 A CN 202110644516A CN 113310754 A CN113310754 A CN 113310754A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
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Abstract
The invention relates to an atmospheric particulate continuous classification wet sampling device which comprises a collecting mechanism, a trapping mechanism and a circulating mechanism, wherein the collecting mechanism comprises a sampling head and an air pump, and is connected with the trapping mechanism through a first air guide pipeline; the trapping mechanism comprises a trapping cavity, an air inlet and an air outlet are formed in the trapping cavity, a fog film generating assembly is arranged at one end in the trapping cavity, a particulate matter collecting assembly is arranged at the other end in the trapping cavity, and the fog film generating assembly is used for sending fog drops capable of trapping particulate matters into the trapping cavity; the circulating mechanism is connected with the trapping mechanism through a water guide pipeline. According to the invention, the fog film is used for replacing the traditional filter membrane, so that the steps are simplified, the continuous collection of particulate matters with specific particle sizes is effectively realized, the result difference caused by artificial interference can be reduced, the original ecological sample is obtained, and the technical basis is provided for the subsequent online analysis.
Description
Technical Field
The invention relates to the technical field of atmospheric particulate matter detection, in particular to a continuous grading wet sampling device for atmospheric particulate matter.
Background
According to the environmental air quality standard of the people's republic of China released in 2012, fine particles refer to particles with an aerodynamic equivalent diameter of less than or equal to 2.5 μm in the environmental air, and are also called fine particles. Under the calm and steady weather condition of no wind, if go in a large amount of fine particles discharge to ambient air, in case when surpassing ability and the limit that this regional environment atmosphere circulation can bear, will appear the haze, the trip of people is not only influenced in the appearance of haze, still can seriously harm human health. Especially, the nanometer fine particles floating in the haze can pass through the nasal cavity and the trachea through the breath of people, finally reach the alveolus to destroy the functions of the organs of the respiratory system, and cause chronic respiratory diseases. Even some nanometer particles can enter the blood circulation through alveolus to destroy the blood circulation system and cause various cardiovascular diseases. In addition, the fine particles are carriers of toxic and harmful substances such as various heavy metal elements, and the pollution problem of the atmospheric particles becomes one of the main obstacles for harming national economic development and environmental harmonious development.
The traditional atmospheric particulate sampling method is a filter membrane sampling method, and when the filter membrane is weighed, a sampler is required to pump and adsorb fine particulate matters in ambient air onto the filter membrane at a certain flow rate. The main purpose of this method is to obtain the mass concentration of the particulate matter and it is not convenient to directly obtain a particulate matter sample. In order to obtain particles, a filter membrane is firstly sheared, then a reagent is added for extraction, and filtration is carried out after ultrasonic oscillation, so that the operation is very complicated and time-consuming. During this process, the sample may be contaminated, destroying the characteristics of the sample itself, and causing errors in the results. Therefore, it is very necessary to invent a brand-new, high-efficiency and pollution-free atmospheric particulate continuous classification wet sampling device and method.
Disclosure of Invention
Based on the technical scheme, the invention provides the atmospheric particulate continuous classification wet sampling device, and the invention replaces the traditional filter membrane with the fog membrane, simplifies the steps, effectively realizes the continuous collection of particulate matters with specific particle sizes, can reduce the result difference caused by artificial interference, obtains a pollution-free sample and provides a technical basis for the subsequent on-line analysis.
The atmospheric particulate continuous classification wet sampling device comprises a collecting mechanism, a trapping mechanism and a circulating mechanism, wherein the collecting mechanism comprises a sampling head and an air pump, and the collecting mechanism is connected with the trapping mechanism through a first air guide pipeline;
the trapping mechanism comprises a trapping cavity, an air inlet and an air outlet are formed in the trapping cavity, a fog film generating assembly is arranged at one end of the interior of the trapping cavity, a particulate matter collecting assembly is arranged at the other end of the interior of the trapping cavity, and the fog film generating assembly is used for emitting fog drops capable of trapping particulate matters into the trapping cavity; the circulating mechanism is connected with the trapping mechanism through a water guide pipeline.
Further, the trapping mechanism comprises a first trapping chamber, a second trapping chamber and a third trapping chamber, wherein the exhaust port of the first trapping chamber is connected with the air inlet of the second trapping chamber through a second air guide pipeline, and the exhaust port of the second trapping chamber is connected with the air inlet of the third trapping chamber through a third air guide pipeline;
each trapping cavity is internally provided with a group of fog film generation assemblies and particulate matter collection assemblies, and each fog film generation assembly generates fog drops with different particle sizes so as to trap the particulate matters with different particle sizes.
Furthermore, the first air guide pipeline, the second air guide pipeline and the third air guide pipeline are all provided with heating units.
Further, S-shaped baffles are arranged on the inner side walls of the first collecting chamber, the second collecting chamber and the third collecting chamber, and are used for enabling airflow to generate vortex.
Furthermore, the fog film generating assembly in the first trapping chamber is used for generating fog drops with the particle size range of 10-15 microns, the fog film generating assembly in the second trapping chamber is used for generating fog drops with the particle size range of 5-10 microns, and the fog film generating assembly in the third trapping chamber is used for generating fog drops with the particle size range of 1-5 microns.
Further, the fog film generation assembly comprises an atomizing chamber, an atomizing nozzle and a fan, wherein the water inlet end of the atomizing chamber is connected with the water tank, the water outlet end of the atomizing chamber is connected with the atomizing nozzle, an atomizing sheet is arranged in the atomizing chamber and generates water mist through vibration, and the fan is arranged on one side of the atomizing nozzle and sends the fog drops sprayed by the atomizing nozzle into the collecting cavity.
Further, the particulate matter collection assembly comprises a guide plate and a sample collection pipe, the guide plate is obliquely arranged below the fog film generation assembly, and the sample collection pipe is arranged at one end of the guide plate, which is obliquely inclined downwards.
Further, the circulating mechanism comprises a water tank, a liquid conveying pipe, a liquid collecting pipe and a plurality of layers of metal grids, the water tank is communicated with the atomizing chamber through the liquid conveying pipe, and the water tank is respectively communicated with the first trapping chamber, the second trapping chamber and the third trapping chamber through the liquid collecting pipe;
the multilayer metal grids are vertically arranged in the first trapping chamber, the second trapping chamber and the third trapping chamber and are positioned on the front side of the exhaust port, and the multilayer metal grids are used for accelerating condensation of fog drops and guiding condensed water into the liquid collecting pipe.
Further, the circulating mechanism further comprises a water level detector, and the water level detector is arranged inside the atomizing chamber.
The collecting mechanism further comprises a three-way valve, an air inlet net film and a particulate matter cutter are arranged in the sampling head, the air inlet net film is arranged at the front end of an air inlet of the particulate matter cutter, an air outlet of the sampling head is connected with the air pump, and the air pump is connected with an air inlet of the trapping chamber through the first air guide pipeline;
the three-way valve is arranged between the air pump and the first air guide pipeline and used for adjusting the flow rate.
According to the atmospheric particulate continuous classification wet sampling device provided by the embodiment of the invention, the fog film generation assemblies are respectively arranged in the three trapping chambers, fog drops with three particle sizes are respectively generated in the three trapping chambers by controlling the vibration frequency of the atomizing sheet, the fog drops with different particle sizes can be trapped aiming at atmospheric particulates with different particle sizes in the air, and the three trapping chambers are simultaneously subjected to continuous trapping work through the work of the water circulation system, so that the graded continuous collection of the atmospheric particulates is realized, the result difference caused by artificial interference can be reduced, a 'original ecological' sample is obtained, and a technical basis is provided for subsequent online analysis.
Drawings
FIG. 1 is a schematic diagram of a continuous classification wet sampling device for atmospheric particulates according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an S-shaped baffle in the atmospheric particulate continuous classification wet sampling device according to an embodiment of the invention;
fig. 3 is a circuit diagram of an atomization sheet of the atmospheric particulate continuous classification wet sampling device in one embodiment of the invention.
Reference numerals: 1. a collection mechanism; 11. a sampling head; 111. an air inlet net film; 112. a particulate cutter; 12. an air pump; 121. a gas flow meter; 13. a three-way valve; 2. a trapping mechanism; 21. a first trapping chamber; 211. an atomization chamber; 211a, an atomizing sheet; 212. an atomizing spray head; 213. a fan; 214. a baffle; 215. a first gas guide duct; 22. a second trapping chamber; 221. a second gas guide duct; 23. a third capture chamber; 231. a third gas conduit; 3. a circulating mechanism; 31. a water tank; 32. a transfusion tube; 33. a liquid collecting pipe; 34. a water level detector; 35. a water pump; 4. a heating unit.
For a better understanding and implementation, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In the following, several specific embodiments are given for describing the technical solution of the present application in detail. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Please refer to fig. 1, which is a schematic diagram of an atmospheric particulate continuous classification wet sampling device in this embodiment, the atmospheric particulate continuous classification wet sampling device in this embodiment includes a collecting mechanism 1, a trapping mechanism 2 and a circulating mechanism 3, the collecting mechanism 1 includes a sampling head 11 and an air pump 12, the collecting mechanism 1 is communicated with an air inlet of the trapping mechanism 2 through an air duct, a fog film generating component and a particulate collecting component are disposed in the trapping mechanism 2, the trapping of particulate is realized by generating a fog film, and the circulating mechanism 3 is connected with the trapping mechanism 2 through a liquid guide tube, so that the fog film can be continuously generated in the trapping mechanism 2 for particle trapping.
In the above embodiment, the air pump 12 is disposed between the sampling head 11 and the trapping mechanism 2, after the air pump 12 works, air to be detected is pumped into the sampling head 11 under the air pumping action, and then enters the trapping mechanism 2 through the air duct, the sampling head 11 is provided with the air inlet net film 111 and the particulate cutter 112, the air inlet net film 111 is disposed at the air inlet of the sampling head 11, and is used for filtering large-size impurities in the air to be detected, and the air to be detected after being filtered by the air inlet net film 111 enters the particulate cutter 112 for processing. Preferably, the air pump 12 is further provided with a gas flowmeter 121, the gas flowmeter 121 collects a current air flow signal to be collected, and the work of the air pump 12 is controlled according to the flow signal, so that the gas flow rate meets the requirement of particle cutting, and the cutting efficiency of the particles is ensured.
In the above embodiment, the collecting mechanism 1 further includes a three-way valve 13, the three-way valve 13 is disposed between the air pump 12 and the trapping mechanism 2, the air collected and processed by the sampling head 11 and containing the cut particles flows into the three-way valve 13, and the flow rate is adjusted by the three-way valve 13 to enter the trapping mechanism 2, so as to ensure the effect of trapping the particles.
As shown in fig. 1, in an embodiment, the trapping mechanism 2 includes a trapping chamber, and a fog film generating assembly and a particulate matter collecting assembly which are disposed in the trapping chamber, the trapping chamber includes a square housing, the trapping chamber is disposed inside the housing, preferably, the fog film generating assembly is disposed inside the housing around the trapping chamber, and injects the generated fog film into the trapping chamber, the housing is provided with an air inlet and an air outlet which are communicated with the trapping chamber and the outside, specifically, the trapping mechanism 2 includes a first trapping chamber 21, a second trapping chamber 22 and a third trapping chamber 23, each trapping chamber is provided with a group of identical fog film generating assemblies and particulate matter collecting assemblies, the air inlet of the first trapping chamber 21 is connected with the collecting mechanism 1 through a first air guide pipe 215, and the air outlet is connected with the air inlet of the second trapping chamber 22 through a second air guide pipe 221, the exhaust port of the second trapping chamber 22 is connected to the intake port of the third trapping chamber 23 through the third gas guide duct 231.
Taking the first trapping chamber 21 as an example, the fog film generating assembly specifically comprises an atomizing chamber 211, an atomizing spray head 212 and a fan 213, the atomizing chamber 211 is disposed inside the housing below the first trapping chamber 21, the atomizing chamber 211 comprises a liquid inlet and a liquid outlet, the atomizing chamber 211 is connected with the circulating mechanism 3 through the liquid inlet and is connected with the atomizing spray head 212 through the liquid outlet, an atomizing sheet 211a is disposed inside the atomizing chamber 211, the atomizing sheet 211a generates water fog through vibration, preferably, the atomizing sheet 211a is an ultrasonic atomizing sheet 211a, and the size of the generated fog drop particle diameter is changed by changing the oscillation frequency of the atomizing sheet 211 a.
The atomizer 212 and the fan 213 are disposed inside the housing above the first trapping chamber 21, the atomizer 212 extends into the first trapping chamber 21, and sprays the water mist generated in the atomizer 211 into the first trapping chamber 21, preferably, the fan 213 is disposed above the atomizer 212, and blows air towards the direction in the first trapping chamber 21, so that the mist is filled in the whole first trapping chamber 21 by matching with the atomizer 212, the particulate matter entering the first trapping chamber 21 through the first air guide duct 215 is wrapped by the mist, and falls downward under the action of gravity, thereby completing the collection of the particulate matter.
In the above embodiment, the particulate collection assembly comprises the guide plate 214 and the sample collection tube, the guide plate 214 is disposed at the bottom of the first trapping chamber 21, preferably, the guide plate 214 is disposed obliquely so that one end of the guide plate 214 is higher than the other end thereof, the sample collection tube is disposed at the lower end of the guide plate 214, and the particulate matter wrapped by the mist drops falls on the guide plate 214 due to the influence of gravity and flows into the sample collection tube along the guide plate 214 for preservation.
Preferably, in order to achieve the classified collection of the particulate matters, the atomizing plates 211a in each trapping chamber are set to have different vibration frequencies, so that the mist drops with different particle sizes are generated, and the mist drops with different particle sizes can be used for classified trapping of the particulate matters with different particle sizes. Specifically, the atomizing plates 211a in the first trapping chamber 21 are used for generating fog drops with the particle size range of 10-15 μm, the atomizing plates 211a in the second trapping chamber 22 are used for generating fog drops with the particle size range of 5-10 μm, and the atomizing plates 211a in the third trapping chamber 23 are used for generating fog drops with the particle size range of 1-5 μm, so that each trapping chamber traps particulate matters with different particle sizes.
As shown in fig. 3, in one embodiment, the vibration frequency of the atomizing plate 211a in each atomizing chamber is controlled by a frequency conversion control circuit, the dc power supply is connected to a low-frequency oscillation circuit to generate an oscillation signal, the power amplifier 1 is connected with the atomizing plate 211a in the first collecting chamber 21, and the vibration frequency is controlled to generate mist droplets with a particle size range of 10 to 15 μm, the DC power supply is connected with an intermediate frequency oscillation circuit to generate oscillation signals, connected with the atomizing plate 211a in the second trap chamber 22 through the power amplifier 2, and controlling the vibration frequency thereof to generate mist droplets with a particle size range of 5 to 10 μm, the DC power source is connected with a high frequency oscillation circuit to generate oscillation signals, the power amplifier 3 is connected with the atomizing plate 211a in the third trapping chamber 23, and the vibration frequency is controlled to generate mist drops with the particle size range of 1-5 μm, and the particles with different particle sizes are trapped by the mist drops with different particle sizes.
Preferably, the first gas guide channel 215, the second gas guide channel 221 and the third gas guide channel 231 are all provided with heating units 4, in this embodiment, the heating units 4 are specifically wound around resistance wires arranged on the tube walls, and the brownian motion of the particles is stronger by increasing the temperature, so that the trapping efficiency is increased.
In one embodiment, as shown in fig. 2, an S-shaped baffle is disposed on an inner side wall of each trapping chamber, and when the airflow enters the inside of the trapping chamber, the airflow generates a vortex under the guidance of the S-shaped baffle, so that the probability of collision between the mist droplets and the atmospheric particulates is increased, and the trapping efficiency is increased.
As shown in fig. 1, in one embodiment, the circulation mechanism 3 includes a water tank 31, a liquid transfer pipe 32, a liquid collection pipe 33, a multi-layer metal mesh, and a water pump 35, the water pump 35 pumps water in the water tank 31 into the atomization chamber 211 through the liquid transfer pipe 32, the water tank 31 is connected to the collection chamber through the liquid collection pipe 33, mist in the collection chamber is reintroduced into the water tank 31 for circulation, the liquid collection pipe 33 is disposed at a lower end of the guide plate 214, and the mist drops fall on the guide plate 214, are guided by the guide plate 214, and flow into the liquid collection pipe 33. Preferably, the multiple layers of metal grids are vertically arranged inside each trapping chamber, particularly in front of the exhaust port, and when the fog drops touch the multiple layers of metal grids, the fog drops are accelerated to be condensed and flow to the guide plate 214 along the multiple layers of metal grids, so that the circulation of water is realized.
Preferably, the circulating mechanism 3 further includes a water level detector 34, the water level detector 34 is disposed inside the atomizing chamber 211, and the water level detector 34 detects the amount of water in the atomizing chamber 211 and sends a control signal to the water pump 35, so as to control the operation of the water pump 35.
When the atmospheric particulate continuous classification wet sampling device in the embodiment of the invention starts to work:
firstly, the water pump 35 is started, water is injected into the atomizing chamber 211, the atomizing sheet 211a in the first collecting chamber 21 is set to vibrate to generate 10-15 μm fog drops, the atomizing sheet 211a in the second collecting chamber 22 is set to vibrate to generate 5-10 μm fog drops, the atomizing sheet 211a in the third collecting chamber 23 is set to vibrate to generate 1-5 μm fog drops, the heating unit 4 is further controlled to heat the first air guide pipeline 215, the second air guide pipeline 221 and the third air guide pipeline 231 to a preset temperature, and the fog drops are filled in each collecting chamber.
Then, the air pump 12 is started to collect air, the air to be collected enters the first trapping chamber 21 after being pretreated by the collecting mechanism 1, the fog drops in the first trapping chamber 21 wrap the atmospheric particulate matters with larger particle sizes and fall on the guide plate 214 under the action of gravity, so that the air flows into the sample collecting pipe for storage, then the particulate matters which are not trapped flow into the second trapping chamber 22 through the second air guide pipe 221, the fog drops in the second trapping chamber 22 wrap the atmospheric particulate matters with smaller particle sizes and are collected, then the residual air flows into the third trapping chamber 23 through the third air guide pipe 231, and the fog drops wrap the nano-scale atmospheric particulate matters and are collected.
In the working process, the fog drops contact with the multi-layer metal grid, are condensed and then flow to the water tank 31 through the liquid collecting pipe 33 for circulation, and the water pump 35 continuously thickens water into the atomizing chamber 211 according to water level data in the atomizing chamber 211 detected by the water level detector 34, so that the fog drops with various particle sizes are continuously generated in the atomizing chamber 211.
The atmospheric particulate continuous classification wet sampling device in the embodiment of the invention generates fog drops with different particle sizes through the atomizing sheet 211a, so that the fog drops wrap particulate matters with different particle sizes in the trapping cavities of all stages, and the classification continuous collection of the particulate matters is effectively realized.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. The utility model provides an atmospheric particulates continuous classification wet process sampling device which characterized in that includes:
the device comprises a collecting mechanism, a trapping mechanism and a circulating mechanism, wherein the collecting mechanism comprises a sampling head and an air pump, and is connected with the trapping mechanism through a first air guide pipeline;
the trapping mechanism comprises a trapping cavity, an air inlet and an air outlet are formed in the trapping cavity, a fog film generating assembly is arranged at one end of the interior of the trapping cavity, a particulate matter collecting assembly is arranged at the other end of the interior of the trapping cavity, and the fog film generating assembly is used for emitting fog drops capable of trapping particulate matters into the trapping cavity;
the circulating mechanism is connected with the trapping mechanism through a water guide pipeline.
2. The atmospheric particulate continuous classification wet sampling device of claim 1, wherein:
the trapping mechanism comprises a first trapping chamber, a second trapping chamber and a third trapping chamber, wherein an exhaust port of the first trapping chamber is connected with an air inlet of the second trapping chamber through a second air guide pipeline, and an exhaust port of the second trapping chamber is connected with an air inlet of the third trapping chamber through a third air guide pipeline;
each trapping cavity is internally provided with a group of fog film generation assemblies and particulate matter collection assemblies, and each fog film generation assembly generates fog drops with different particle sizes so as to trap the particulate matters with different particle sizes.
3. The atmospheric particulate continuous classification wet sampling device of claim 2, wherein:
and the first air guide pipeline, the second air guide pipeline and the third air guide pipeline are all provided with heating units.
4. The atmospheric particulate continuous classification wet sampling device of claim 3, wherein:
s-shaped baffles are arranged on the inner side walls of the first collecting chamber, the second collecting chamber and the third collecting chamber, and are used for enabling airflow to generate vortex.
5. The atmospheric particulate continuous classification wet sampling device of claim 4, wherein:
the fog film generation assembly in the first trapping chamber is used for generating fog drops with the particle size range of 10-15 mu m, the fog film generation assembly in the second trapping chamber is used for generating fog drops with the particle size range of 5-10 mu m, and the fog film generation assembly in the third trapping chamber is used for generating fog drops with the particle size range of 1-5 mu m.
6. The atmospheric particulate continuous classification wet sampling device of claim 5, wherein:
the fog film generation assembly comprises an atomizing chamber, an atomizing nozzle and a fan, wherein the water inlet end of the atomizing chamber is connected with the water tank, the water outlet end of the atomizing chamber is connected with the atomizing nozzle, an atomizing sheet is arranged in the atomizing chamber and generates water fog through vibration, and the fan is arranged on one side of the atomizing nozzle and sends the fog drops sprayed by the atomizing nozzle into the collecting cavity.
7. The atmospheric particulate continuous classification wet sampling device of claim 1, wherein:
the particle collection assembly comprises a guide plate and a sample collection pipe, the guide plate is obliquely arranged below the fog film generation assembly, and the sample collection pipe is arranged at one end of the guide plate, which is obliquely inclined downwards.
8. The atmospheric particulate continuous classification wet sampling device of claim 1, wherein:
the circulating mechanism comprises a water tank, a liquid conveying pipe, a liquid collecting pipe and a plurality of layers of metal grids, the water tank is communicated with the atomizing chamber through the liquid conveying pipe, and the water tank is respectively communicated with the first trapping chamber, the second trapping chamber and the third trapping chamber through the liquid collecting pipe;
the multilayer metal grids are vertically arranged in the first trapping chamber, the second trapping chamber and the third trapping chamber and are positioned on the front side of the exhaust port, and the multilayer metal grids are used for accelerating condensation of fog drops and guiding condensed water into the liquid collecting pipe.
9. The atmospheric particulate continuous classification wet sampling device of claim 8, wherein:
the circulating mechanism further comprises a water level detector, and the water level detector is arranged inside the atomizing chamber.
10. The atmospheric particulate continuous classification wet sampling device of claim 1, wherein:
the collecting mechanism further comprises a three-way valve, an air inlet net film and a particulate matter cutter are arranged in the sampling head, the air inlet net film is arranged at the front end of an air inlet of the particulate matter cutter, an air outlet of the sampling head is connected with the air pump, and the air pump is connected with an air inlet of the trapping chamber through the first air guide pipeline; the three-way valve is arranged between the air pump and the first air guide pipeline and used for adjusting the flow rate.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115479808A (en) * | 2021-11-29 | 2022-12-16 | 山东大学 | Particle size grading acquisition method of multi-stage cloud and mist water collector |
| CN115479808B (en) * | 2021-11-29 | 2024-01-30 | 山东大学 | Particle size collection method of multistage cloud and mist water collector |
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Application publication date: 20210827 |