KR20200080633A - Fine dust measuring device - Google Patents

Abstract

The present invention relates to a particulate matter measurement device comprising: an electric charging unit including a fine channel and electrically charging particles of air flowing into the fine channel; a first classification unit disposed at the front or rear end of the electric charging unit and aerodynamically classifying particulate matter included in the inflow air into first particulate matter with a relatively greater size and second particulate matter with a relatively smaller size; a second classification unit disposed at the rear end of the first classification unit to receive the air including the second particulate matter with the relatively smaller size and aerodynamically classifying particulate matter included in the inflow air into third particulate matter with a relatively greater size and fourth particulate matter with a relatively smaller size; a first capture unit capturing the air including the third particulate matter discharged from the second classification unit; a second capture unit capturing the air including the fourth particulate matter discharged from the second classification unit; and a measurement unit measuring the concentration of particulate matter based on an induction current value proportional to the concentration of the particulate matter captured in the first capturing unit and the second capturing unit. Accordingly, PM10 and PM2.5 can be simultaneously classified and measured, thereby simultaneously measuring the concentrations of particulate matter and fine particulate matter. PM10 and PM2.5 can be simultaneously classified through two classification units, thereby increasing reliability in a measurement value. Moreover, a configuration of a capturing unit is simplified, thereby realizing low manufacturing costs.

Description

Fine dust measuring device {FINE DUST MEASURING DEVICE}

The present invention relates to an apparatus for measuring fine dust, and more specifically, it classifies the fine dust into multiple stages while achieving a low level of manufacturing cost while guaranteeing substantially the same level of measurement value as an expensive optical fine dust device. The present invention relates to a fine dust measuring device capable of simultaneously measuring PM10 and PM2.5.

Recently, the concentration of fine dust suspended in the air has increased significantly due to the continuous industrial development and the introduction of smog from China. When the fine dust is inhaled into the human body, it not only causes respiratory and cardiovascular diseases, but also exacerbates allergic diseases such as asthma and atopic dermatitis. Accordingly, in recent years, a system capable of monitoring the concentration of fine dust has been spread.

On the other hand, in general, an air pollution monitoring station equipped with fine dust measurement equipment is installed in units of hours or hours to provide a wide area forecast system that provides an average concentration per hour of fine dust. However, in recent years, as high-rise buildings are dense and there are many changes in the flow population and traffic volume, the diffusion patterns of air flow and fine dust are very complicated, so the concentration of fine dust is also large between adjacent areas. Therefore, it is difficult to grasp the precise concentration distribution of fine dust through a general wide area forecast system.

Accordingly, in recent years, it is required to measure fine dust that can grasp fine dust in a small area in real time.

However, it is known that air pollution monitoring stations equipped with conventional fine dust measuring equipment are not installed in a narrow area, but are mainly installed in a wide area of a city or district, because the fine dust measuring devices are formed at very high prices. have.

In addition, the low-priced fine dust measuring equipments, which are relatively inexpensive compared to the expensive ones, have a problem in that the accuracy of the measured values is significantly lower than that of the expensive equipments, and the reliability of the measured values is low.

In addition, the conventional fine dust measuring devices had the inconvenience of separately providing a measuring device for PM10 and a measuring device for PM2.5.

1. Published Patent No. 10-2017-0117960 (Publication date: October 24, 2017) "Fine dust concentration measurement system" 2. Registered Patent No. 10-1683433 (Registration Date: November 30, 2016) "A device for measuring suspended particulate matter having ultra fine particle diameter and fine particle diameter"

The object of the present invention is to solve the conventional problems as described above, it is an object to provide a fine dust measuring apparatus capable of improving the accuracy of the fine dust measurement value while realizing a low manufacturing cost.

Specifically, it is an object of the present invention to provide a fine dust measuring device capable of classifying and measuring PM10 and PM2.5 simultaneously by classifying fine dust into multiple stages.

In addition, an object of the present invention is to provide a fine dust measuring device capable of improving the accuracy of the measured value by improving the particle charge rate in the charged part of the fine dust measuring device.

In addition, an object of the present invention is to provide a fine dust measuring device capable of improving the airtightness in the charged part to improve the accuracy of the measured value.

In addition, an object of the present invention is to provide a compact fine dust measuring device by simplifying the configuration of a collecting part for collecting charged particles.

In addition, an object of the present invention is to provide a fine dust measuring device having a low manufacturing cost by constructing a partial configuration of the collecting portion with a low-cost material.

The subject, according to an embodiment of the present invention, includes a microchannel, a charging unit for electrically charging the particles of air flowing into the microchannel; A first classification unit located at the front end or the rear end of the charged part and aerodynamically classifying the fine dust contained in the inflowing air into relatively large first fine dust and relatively small second fine dust; Located at the rear end of the first classification unit, air including the relatively small second fine dust flows in, and aerodynamically classifies the introduced air into a relatively large third fine dust and a relatively small fourth fine dust. A second classification unit; A first collecting part in which air including the third fine dust discharged from the second classification part is collected; A second collecting part in which air including the fourth fine dust discharged from the second classification part is collected; And a measuring unit configured to measure the concentration of fine dust with an induction current value proportional to the concentration of fine dust collected in the first and second collection parts. .

Here, the microchannels of the charged portion may be formed with inclined surfaces on the left and right side walls in the flow direction of air.

In addition, the bottom surface of the microchannel of the charged portion may be formed to gradually rise along the flow direction of air.

In addition, the collecting unit may include an air inlet and a housing having an air outlet formed to allow air to flow in and out, and a collecting means for collecting charged microparticles by being electrically connected to the inside of the housing. have.

In addition, the collecting part may further include a cylindrical filter made of a metal material installed between the housing and the collecting means.

In addition, the collecting portion may further include a supporting means coupled with the lower end of the collecting means to support the wound form of the collecting means.

Further, the collecting means may be a metal mesh or a metal cloth.

In addition, the first classification unit and the second classification unit, a nozzle through which air containing fine dust is introduced and injected; And a low-speed flow path and a high-speed flow path in which one fine dust and the other fine dust flow in from the nozzle.

In addition, the low-speed flow path may be formed to be located in a linear direction with the nozzle, and the high-speed flow path may be formed to be positioned in the vertical direction with the nozzle and the low-speed flow path.

In addition, the charged portion, the first classification portion and the second classification portion are formed on a single body coupled on a substrate in the form of an analysis chip that is collectively manufactured by a MEMS process, and a sealing portion is interposed between the body and the substrate. Can.

Meanwhile, the first fine dust may have a particle size of 10.0 μm or more, the second fine dust may have a particle size of less than 10.0 μm, the third fine dust may have a particle size of more than 2.5 μm, and the fourth fine dust may have a particle size of 2.5 μm or less. .

According to the present invention, a fine dust measuring device capable of improving the accuracy of fine dust measurement values while realizing a low manufacturing cost is provided.

Specifically, a fine dust measuring device capable of classifying and measuring PM10 and PM2.5 simultaneously by classifying fine dust in multiple stages is provided.

In addition, there is provided a fine dust measuring device that can improve the accuracy of the measured value by improving the airtightness in the charged portion.

In addition, a compact fine dust measuring device is provided by simplifying the configuration of the collecting portion for collecting charged particles.

In addition, a fine dust measuring device having a low manufacturing cost is provided by constructing a partial configuration of the collecting part with a low-cost material.

1 is an overall configuration of a fine dust measuring apparatus according to a first embodiment of the present invention,
Figure 2 is a schematic diagram of the fine dust concentration measuring device of Figure 1,
Figure 3 is a bottom view of Figure 2,
4 is a cross-sectional view taken along line A-A' in FIG. 3,
5 is a cross-sectional view of B-B' of FIG. 3,
Figure 6 is an enlarged view of the first classification of Figure 3,
7 is a detailed view of the first collecting part of FIG. 1,
8 is a detailed view of a second embodiment of the first collecting part of the present invention,
9 is a detailed view of a third embodiment of the second collecting part of the present invention,
10 is a detailed view of a fourth embodiment of the third collecting part of the present invention.

Prior to the description, in various embodiments, components having the same configuration are typically described in the first embodiment by using the same reference numerals, and in other embodiments, configurations different from the first embodiment will be described. do.

Hereinafter, a fine dust measuring apparatus according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall configuration diagram of a fine dust measuring apparatus according to a first embodiment of the present invention. Referring to FIG. 1, the apparatus for measuring fine dust according to the first embodiment of the present invention includes a charged part 10, a sorting part 20, a collecting part 30, and a measuring part 40.

Here, the apparatus for measuring the concentration of fine dust is to measure the concentration of fine dust, and more specifically, it will be described as an example for measuring the concentration of fine dust of 10 μm or less and ultrafine dust of 2.5 μm or less. However, the present invention is not limited thereto, and the apparatus for measuring fine dust according to the present invention may be modified in various ways, such as measuring concentrations of two types of fine dust having different sizes.

FIG. 2 is a schematic view of the apparatus for measuring fine dust concentration in FIG. 1, FIG. 3 is a bottom view of FIG. 2, FIG. 4 is a cross-sectional view taken along line A-A' in FIG. 3, and FIG. 5 is a cross-sectional view taken along line B-B' in FIG. .

First, referring to FIGS. 2 and 3, the apparatus for measuring fine dust concentration according to the first embodiment of the present invention is in the form of a chip for analyzing fine dust that is collectively manufactured by a MEMS (Micro Electro Mechanical Systems) process. Is prepared. That is, the charged portion 10 to be described later, the first classification unit 20 and the second classification unit 30 are integrally formed with the main body 1 coupled on the substrate 2, and the main body 1 and the substrate The sealing part 3 is interposed between (2). The main body 1, the substrate 2 and the sealing portion 3 may be fastened to each other through predetermined fastening means such as bolts.

The charging section 10 is a substrate 2 with a high voltage conversion circuit, a channel main body 10a with a fine channel 14, a high voltage applying section 11, a first electrode 15 and a second electrode 16 And a sealing part 3.

The substrate 2 has a built-in high voltage conversion circuit, and is installed to contact one side of the channel body 10a.

The channel body (10a) is a portion formed on the upstream side of the air flow direction of the main body (1), the inlet (12) and the fine channel (14) and charged air through which air containing fine dust flows is discharged It is configured to include a discharge port (13).

3, 4 and 5, at least one side wall of the microchannel 14, preferably the left and right sidewalls, is formed in an inclined surface so that the channel width becomes narrower toward the upward direction (the channel width becomes wider toward the downward direction). do.

Through this, the region formed by the electric field formed between the first electrode 15 and the second electrode 16 substantially coincides with the region inside the channel, so that the charge rate of particles such as fine dust due to corona discharge is significantly improved. Can.

In addition, the bottom surface of the microchannel 14 may be formed to gradually rise along the flow direction of air. That is, it is possible to increase the flow rate of the first sorting section 20 described later to the nozzle 21.

The high voltage applying unit 11 is installed to generate corona discharge between the first electrode 15 and the second electrode 16 through a constant high voltage applied from the high voltage conversion circuit.

Here, the first electrode 15 is provided in a pointed tip shape, and the end is a discharge electrode made of a conductive metal or the like, and is installed to be positioned toward the microchannel 14 side.

In addition, the second electrode 16 is a plate-shaped electrode made of a conductive metal and is installed on a substrate surface facing the first electrode 15 to function as a ground electorde.

The sealing portion 3 is made of a material made of silicon or the like and is interposed between the substrate 2 and the channel body 10a to secure the airtightness of the space formed in the channel body 10a, such as the fine channel 14, and the second electrode. An opening is formed in the portion where 16 is located (see Fig. 2).

When the DC high voltage is applied from the substrate through the high voltage conversion circuit between the first electrode 15 and the second electrode 16, the charged portion 10 has a distal tip formed on the first electrode 15. Corona discharges occur nearby, accelerating electrons and colliding with molecules in the air.

Therefore, the ions generated by the separation of air molecules into ions and electrons are attached to particles of fine dust passing between the first electrode 15 and the second electrode 16 to form charged particles.

The cations generated in the first electrode 15 are formed while drawing a hemispherical trajectory toward the surface of the second electrode 16 around the first electrode 15 having a pointed tip shape, thereby forming corona discharge. . At this time, both sidewalls of the fine channel 14 are formed as inclined surfaces, and as the corona discharge occurs in all interior spaces, the charge rate is significantly increased.

Next, since the first classification part and the second classification part have substantially the same shape, the first classification part is typically described, and a detailed description of the second classification part will be omitted.

The first classification unit 20 is formed on the downstream side of the air flow direction of the main body 1, and is provided to classify the air including the fine dust that has passed through the charging unit 10 by particle size (FIG. 2) And Figure 3).

Specifically, the first classification body (20a) is formed extending from the channel body (10a), the classification body (20a), the first nozzle 21 and the air that passes through the charged portion 10 is introduced and injected, It is configured to include a first low-speed flow path 22 and a second high-speed flow path 23 branched from the first nozzle 21 and discharge portions formed at the ends of each flow path.

The sealing part 3 is interposed between the first classification main body 20a and the substrate to ensure airtightness to the internal space of each flow path formed in the first classification main body 20a.

The first low-speed flow path 22 is formed to be located in a linear direction with the first nozzle 21, and the first high-speed flow path 23 is the first nozzle 21 and the first low-speed flow path 22 It is formed to be positioned in the vertical direction. In this embodiment, a pair of first high-speed flow paths 23 is formed to the left and right of the first low-speed flow path 22.

6 is an enlarged view of the first classification unit of FIG. 3. Referring to FIG. 6, when fine dust is injected through the first nozzle 21, the fine dust F is classified into first fine dust F1 and second fine dust F2 by the inertia force of the fine dust F. That is, in the first low-speed flow path 22 extending in a straight line, particles having a larger size among fine dusts F are moved to the first low-speed flow path 22 by maintaining a linear motion due to large inertia. Due to the small inertia, it is moved from the inflow direction of the fine dust (F) to the first high-speed flow passage (23) provided in a vertical pair.

Here, the first fine dust (F1) flowing into the first low-speed flow path (22) has a particle diameter of 10㎛ or more, and is introduced into the first high-speed flow path (23) located in the vertical direction with the first low-speed flow path (22) The second fine dust (F2) has a particle diameter of less than 10㎛.

The first fine dust (F1) passing through the first low-speed flow path (22) is discharged to the outside through a hole formed at the end of the first low-speed flow path (22), and the second fine passage through the first high-speed flow path (23) The dust F2 is moved to the second classification unit 30 to be described later through the first discharge unit 24.

The second classification unit 30 includes a second classification main body 30a extending from the first classification main body 20a, a second nozzle 31 formed on the second classification main body 30a, and a second low-speed flow path ( 32), a second high-speed flow path 33 and a second discharge portion 34 are configured.

The second nozzle 31 is injected with air that has passed through the first discharge unit 24 of the first classification unit 20, and the second low-speed flow path 32 is straight from the second nozzle 31. The second high-speed flow path 33 is formed to extend, and the second high-speed flow path 33 is formed in a vertical pair with the second low-speed flow path 32.

Here, particles of relatively large size among the second fine dust (F2) are moved to maintain the linear motion due to the large inertia in the second low-speed flow path (32), and the second fine dust (33) to the second high-speed flow path (33). In F2), relatively small particles are moved. That is, the third fine dust flowing into the second low-speed flow path 32 has a particle diameter of 2.5 µm to less than 10 µm, and the fourth fine dust flowing into the second high-speed flow path 23 has a particle diameter of 2.5 µm or less. Have

The third fine dust having a particle diameter of 2.5 µm or more and less than 10 µm passing through the second low-speed flow path 32 is captured by the first collecting portion 40 to be described later, and 2.5 passing through the second high-speed flow path 33 The fourth fine dust having a particle diameter of µm or less may be discharged through the second discharge part 34 and collected by the second capture part 50 described later.

In this embodiment, it is described that the charging section 10 is located at the front end of the first classification section 20 and the second classification section 30, but the charging section 10 is the first classification section 20 and the first It may be located at the rear end of the two-classifying section 30.

Next, the collecting portion will be described. The first collecting portion and the second collecting portion may be formed in the same configuration, and the first collecting portion will be described.

7 is a detailed view of the first collection unit of FIG. 1. Referring to FIG. 7, the first collecting part 40 according to the first embodiment of the present invention includes a housing 41 and a collecting means 42.

The housing 41 is provided in the form of an open lower side is installed on top of a predetermined substrate 44, and the like, the air inlet 41a and the air outlet (air) through which the air is introduced and discharged through the first classification unit 20 ( 41b) are formed respectively. In this embodiment, the air inlet (41a) is formed on the upper end of the housing 41, the air outlet (41b) is shown that is formed on the side of the housing 41, the housing 41 is in a closed form It may be formed.

The collecting means 42 is made of a metal cloth or a metal mesh containing a predetermined metal, is installed in a wound form inside the housing 41, and is electrically connected to a current applying means such as a predetermined electric wire from the outside. do.

That is, when the charged second fine dust flows through the air inlet 41a of the housing 41, it is collected by the collecting means 42, and the remaining air except for the second fine dust is discharged through the air outlet 41b. Can be.

The first collecting part 40 as described above is connected to the end of the second low-speed flow path 32 of the second classification part 30 and is 2.5 μm or more and less than 10 μm classified through the second low-speed flow passage 32. It collects the third fine dust of particle size.

In addition, the second collecting part 50 is connected to the second discharge part 34 of the second high-speed flow passage 33 of the second classification part 30, and is 2.5 μm or less classified through the second high-speed flow passage 33. It collects the fourth fine dust having a particle size of.

The measuring unit 60 is based on the induction current value proportional to the concentration of the fine dust collected in the first collecting unit 40 and the second collecting unit 50 by a pre-installed control circuit or the like 2.5 µm or more ~ 10 Concentrations of fine dust having a particle diameter of less than μm and ultrafine dust having a particle diameter of 2.5 μm or less can be measured, respectively.

The apparatus for measuring fine dust according to the first embodiment of the present invention as described above is configured to continuously collect two fine particles and collect fine dust and ultra fine dust for each size, thereby enabling simultaneous measurement of fine dust and ultra fine dust. Can.

In addition, the reliability of the measurement of the fine dust and the fine dust can be improved by classifying the fine dust from the fine dust once again.

In addition, the first collecting part 40 and the second collecting part 50 constitute a metal cloth or a metal mesh to form the collecting means 42, so that the contact area with the fine dust is wider compared to that provided with a separate electrode or the like. As a result, the capture rate can be significantly improved and manufacturing costs can be significantly reduced.

Next, another embodiment of the first collecting portion and the second collecting portion of the present invention will be described, and representatively, the first collecting portion will be described as an example.

8 is a detailed view of a second embodiment of the first collecting part of the present invention. Referring to FIG. 8, as another embodiment of the first collecting part of the present invention, the first collecting part 40 may further include a supporting means 45 coupled with the lower end of the collecting means 42.

On one surface of the support means 45, support grooves 45a are formed along the wound form of the collection means 42, and the lower end of the collection means 42 is coupled to the support grooves 45a, thereby collecting means 42 ) Can be supported.

In addition, when the support means 45 is made of a conductive material, the current applying means 43 is connected to the support means 45 so that the collecting means 42 can be electrically connected.

9 is a detailed view of a third embodiment of the first collecting part of the present invention. Referring to FIG. 9, as another embodiment of the present invention collecting part, a cylindrical filter 46 made of a metallic material between the housing 41 and the collecting means 42 of the first collecting part 40 according to the first embodiment ) May be further included.

The cylindrical filter 46 is installed to abut against the outer surface of the collecting means 42 to support the collecting means 42, and may be electrically connected to the current applying means 43. Through this, while supporting the collecting means 42 from the outside, it is possible to further enlarge the contact area with the fine dust.

FIG. 10 is a detailed view of a fourth embodiment of the first collecting part of the present invention, in the fourth embodiment when both the supporting means 45 of the second embodiment and the cylindrical filter 46 of the third embodiment are configured.

The fine dust measuring device according to the present invention as described above can substantially lower the manufacturing cost while substantially making the measured value of the conventional expensive optical measuring device substantially the same.

In addition, it is possible to simultaneously measure both fine dust and ultra fine dust by constructing two sorting sections to collect fine dust and ultra fine dust by size, and by separately classifying fine dust and ultra fine dust, The reliability of the ultrafine dust measurement can be improved.

The scope of the present invention is not limited to the above-described embodiments, but may be implemented in various types of embodiments within the scope of the appended claims. Any person skilled in the art to which the invention pertains without departing from the gist of the invention as claimed in the claims is deemed to be within the scope of the claims of the invention to a wide range that can be modified.

※Explanation of symbols for the main parts of the drawing※
1: main body 2, 34: substrate
3: sealing part 10: charging part
10a: channel body 11: high voltage application unit
12: inlet 13: outlet
14: fine channel 15: first electrode
16: second electrode
20: first classification
20a: first classification body 21: first nozzle
22: 1st low speed passage 23: 1st high speed passage
24: first discharge unit
30: second classification
32: second low-speed passage 33: second high-speed passage
34: second discharge unit
40: collecting part
41: housing 41a: air inlet
41b: air outlet 42: collecting means
43: current application means 45: support means
46: cylindrical filter 50: measuring unit

Claims (11)

A charging unit including a micro channel, and electrically charging particles of air flowing into the micro channel;
A first classification unit located at the front end or the rear end of the charged part and aerodynamically classifying the fine dust contained in the inflowing air into relatively large first fine dust and relatively small second fine dust;
Located at the rear end of the first classification unit, air containing the relatively small second fine dust flows in, and aerodynamically classifies the introduced air into a relatively large third fine dust and a relatively small fourth fine dust. A second classification unit;
A first collecting part in which air including the third fine dust discharged from the second classification part is collected;
A second collecting part in which air including the fourth fine dust discharged from the second classification part is collected; And,
And a measuring unit configured to measure the concentration of fine dust with an induced current value proportional to the concentration of fine dust collected in the first collection part and the second collection part. According to claim 1,
The fine channel of the charged portion is a fine dust measuring device in which the right and left side walls in the flow direction of the air are formed as inclined surfaces. The method according to claim 1 or 2,
The bottom surface of the fine channel of the charged portion is a fine dust measuring device is formed to gradually rise along the flow direction of the air. According to claim 1,
The collecting part is a measurement of fine dust comprising an air inlet and a housing having an air outlet formed to allow air to flow in and out, and a collecting means for collecting charged fine particles by being electrically connected to the inside of the housing. Device. According to claim 4,
The collecting unit fine dust measuring device further comprises a cylindrical filter of a metal material installed between the housing and the collecting means. According to claim 4,
The collecting unit further comprises a supporting means coupled with the lower end of the collecting means to support the wound form of the collecting means. According to claim 4,
The collecting means is a metal mesh or metal cloth fine dust measuring device. According to claim 1,
The first classification unit and the second classification unit,
A nozzle through which air containing fine dust is introduced and injected; And,
A fine dust measuring apparatus comprising; a low-speed flow path and a high-speed flow path through which one fine dust and the other fine dust are branched from the nozzle. The method of claim 8,
The low-speed flow path is formed to be positioned in a straight direction with the nozzle, and the high-speed flow path is a fine dust measuring device formed to be located in the vertical direction with the nozzle and the low-speed flow path. According to claim 1,
The charged portion, the first classification portion, and the second classification portion are formed on a single body coupled on a substrate in the form of an analysis chip that is collectively manufactured by a MEMS process, and fine dust is interposed between the body and the substrate. Measuring device. According to claim 1,
The first fine dust having a particle diameter of 10.0 µm or more, the second fine dust having a particle size of less than 10.0 µm, the third fine dust having a particle size of more than 2.5 µm, and the fourth fine dust having a particle size of 2.5 µm or less .

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