KR20200044486A - Fine dust measuring device - Google Patents

Abstract

The present invention relates to a fine dust measuring device comprising: an electrically charging unit including a microchannel of which at least one of side walls formed along the flow direction of introduced air is formed by an inclined surface, and electrically charging particles of air introduced through the microchannel; a classification unit located at the front end or the rear end of the electrically charging part, and aerodynamically classifying fine dust contained in introduced air into relatively large first fine dust and relatively small second fine dust; a collection unit for collecting electrically charged and classified fine dust; and a measurement unit for measuring the concentration of fine dust with an induced current value proportional to the concentration of collected fine dust. According to the present invention, the electrically charging rate of particles the collection rate of electrically charged particles can be enhanced, and production costs can be reduced.

Description

Fine dust measuring device {FINE DUST MEASURING DEVICE}

The present invention relates to a fine dust measuring device, and more particularly, to a fine dust measuring device capable of achieving a low manufacturing cost while guaranteeing substantially the same level of fine dust measurement values as an expensive optical fine dust device. will be.

Recently, the concentration of fine dust floating in the air has been increasing significantly due to the continuous industrial development and the inflow 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, thereby providing a wide area forecast system that provides an average concentration per hour for fine dust. However, in recent cities, 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 complex, 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, the main reason why conventional air pollution monitoring stations equipped with fine dust measuring equipment are not installed in a small area unit but are mainly installed in a wide area in a city or district unit is because the fine dust measurement equipment is formed at a very high price. Is known.

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

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"

An object of the present invention is to solve the conventional problems as described above, and aims to provide a fine dust measuring device capable of improving the accuracy of fine dust measurement values while realizing a low manufacturing cost.

Specifically, 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 airtightness in a charged part and improving accuracy of a 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 is, in accordance with an embodiment of the present invention, at least one sidewall of the sidewalls formed along the flow direction of the introduced air, including a fine channel formed in an inclined surface, electrically charged particles of air flowing into the fine channel Prescribing charges; A classification unit located at the front end or the rear end of the charged portion and aerodynamically classifying fine dust contained in the inflowing air into relatively large first fine dust and relatively small second fine dust; A collecting unit for collecting charged and classified fine dust; And, it may include a; measuring unit for measuring the concentration of the fine dust with an induced current value proportional to the concentration of the collected fine dust.

Here, the bottom surface of the microchannel is preferably formed to gradually rise along the flow direction of the air.

In addition, the collecting unit includes a housing formed with an air inlet and an air outlet respectively 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 in a wound form. desirable.

Further, it is preferable that the collecting part further includes a cylindrical filter made of a metal material installed between the housing and the collecting means.

In addition, it is preferable that the collecting part further includes support means coupled with a lower end of the collecting means to support the wound form of the collecting means.

At this time, the collecting means may be a metal mesh or a metal cloth.

On the other hand, the subject, according to another embodiment of the present invention, includes a microchannel, a charging unit for electrically charging the particles of air flowing into the microchannel; A classification unit located at the front end or the rear end of the charged portion and aerodynamically classifying fine dust contained in the inflowing air into relatively large first fine dust and relatively small second fine dust; A collecting unit that collects fine dust by introducing charged and classified fine dust; And, The measurement unit for measuring the concentration with an induction current value proportional to the concentration of the collected fine dust; Includes, the collection unit, the housing is formed with an inlet and an outlet respectively formed so that air is introduced and discharged; And, it is preferable that it includes; collecting means for collecting charged microparticles by being electrically connected to and installed in a wound form inside the housing.

Here, it is preferable that the collecting part further includes a cylindrical filter made of a metal material installed between the housing and the collecting means.

In addition, it is preferable that the collecting part further includes support means coupled with a lower end of the collecting means to support the wound form of the collecting means.

At this time, the collecting means may be a metal mesh or a metal cloth.

In addition, it is preferable that the left and right sidewalls of the air flow direction are formed in an inclined surface.

In addition, the bottom surface of the microchannel is preferably formed to gradually rise along the flow direction of the air.

In addition, the sorting unit is a nozzle in which air containing fine dust is introduced and injected; And, it is preferred to include a; a low-speed flow path and a high-speed flow path that flows from the nozzle to the first fine dust and the second fine dust, respectively.

In addition, it is preferable that the low-speed flow path is formed to be located in a straight direction with the nozzle, and the high-speed flow path is formed to be located in a vertical direction with the nozzle and the high-speed flow path.

In addition, the charged portion and the sorting portion are formed on a single body coupled on a substrate in the form of an analytical chip that is collectively manufactured by the MEMS process.

In addition, the first fine dust is preferably larger than the particle diameter of 2.5㎛, the second fine dust is smaller than the particle diameter of 2.5㎛.

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

Specifically, 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 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 device 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 an exploded perspective view of the bottom of Figure 2,
4 is a cross-sectional view taken along line A-A 'in FIG. 3,
5 is a sectional view taken along line B-B 'in FIG. 3,
Figure 6 is an enlarged view of the classification unit of Figure 3,
Figure 7 is a detailed view of the collecting part of Figure 1,
8 is a detailed view of a second embodiment of the collecting part of the present invention,
9 is a detailed view of a third embodiment of the collecting part of the present invention,
10 is a detailed view of a fourth embodiment of the 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 ultra fine 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 various modified examples such as measuring the concentration of fine dust of 10 μm or less including ultrafine dust.

2 is a schematic view of the fine dust concentration measuring apparatus of FIG. 1, FIG. 3 is an exploded perspective view of the bottom of FIG. 2, FIG. 4 is an A-A 'sectional view of FIG. 3, and FIG. 5 is a B-B' sectional view of FIG. to be.

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 and the sorting portion 20, which will be described later, are integrally formed with the body 1 coupled on the substrate 2, and the sealing portion 3 is provided between the body 1 and the substrate 2. Is interposed. 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 includes a substrate 2 on which a high voltage conversion circuit is formed, a channel body 10a on which a fine channel 14 is formed, 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 sidewall of the microchannel 14, preferably, the left and right sidewalls are formed in an inclined surface such 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 and the channel inner region substantially coincide, so that the charge rate of fine dust due to corona discharge can be remarkably improved.

In addition, the bottom surface of the microchannel 14 may be formed to gradually rise along the flow direction of air. That is, the flow speed of the sorting unit 20 to be described later to the nozzle 21 can be increased.

The high voltage application 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.

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. As the corona discharge occurs nearby, electrons accelerate and collide 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.

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

Specifically, the sorting body (20a) is formed extending from the channel body (10a), the sorting body (20a) is a nozzle (21) and the nozzle (21) through which air passing through the charged portion (10) is injected and injected It comprises a low-speed flow path 22 and the high-speed flow path 23 and the discharge portion 24 formed at the end of each flow path.

The sealing part 3 is interposed between the sorting body 20a and the substrate, thereby ensuring airtightness to the internal space of each flow path formed in the sorting body 20a.

The low-speed flow path 22 is formed to be located in a straight direction with the nozzle 21, and the high-speed flow path 23 is formed to be located in a vertical direction with the nozzle 21 and the low-speed flow path 22. In this embodiment, a pair of high-speed flow passages 23 are formed to the left and right of the low-speed flow passage 22.

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

Here, the first fine dust (F1) flowing into the low-speed flow path (22) has a particle diameter larger than 2.5㎛, the second fine dust flowing into the high-speed flow path (23) located in the vertical direction with the low-speed flow path (22) ( F2) has a particle diameter smaller than 2.5 μm.

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

In the present embodiment, the charging unit 10 is described as being positioned at the front end of the sorting unit 20, but the charging unit 10 may be located at the rear end of the sorting unit 20.

Next, the collecting portion will be described. 7 is a detailed view of the collecting part of FIG. 1. Referring to FIG. 7, the collecting part 30 according to the first embodiment of the present invention is fine dust having a particle diameter smaller than 2.5 μm that is charged in the above-described charged part 10 and sorted through the sorting part 20. It is provided to collect, it is configured to include a housing 31 and the collecting means (32).

The housing 31 is provided in the form of an open lower side is installed on top of a predetermined substrate 34, and the like, the air inlet 31a and air outlet 31b through which the air flows in and out through the sorting unit 20 Are formed respectively. In this embodiment, the air inlet (31a) is formed on the top of the housing 31, the air outlet (31b) is shown that is formed on the side of the housing 31, the housing (31) is in a closed form It may be formed.

The collecting means 32 is made of a metal cloth or a metal mesh containing a predetermined metal, and is installed in a wound form inside the housing 31, 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 31a of the housing 31, it is collected by the collecting means 32, and the remaining air except for the second fine dust is discharged through the air outlet 31b. Can be.

The measuring unit 40 may measure the concentration of fine dust collected in the collecting unit 30 by a pre-installed control circuit or the like based on the current value to be measured.

In the collecting part 30 according to the first embodiment of the present invention as described above, the collecting means 32 constitutes a metal cloth or a metal mesh, and thus has a contact area with fine dust as compared with a conventional electrode. It can be widened to significantly improve the collection rate and at the same time significantly lower the manufacturing cost.

8 is a detailed view of a second embodiment of the collecting part of the present invention. Referring to FIG. 8, as another embodiment of the present invention collecting part, the collecting part 30 may further include a supporting means 35 engaged with the lower end of the collecting means 32.

On one surface of the support means 35, a support groove 35a is formed along a wound form of the collection means 32, and the lower end of the collection means 32 is coupled to the support groove 35a, thereby collecting means 32 ) Can be supported.

In addition, when the support means 35 is made of a conductive material, the collection means 32 may be electrically connected by connecting the current applying means 33 to the support means 35.

9 is a detailed view of a third embodiment of the collecting part of the present invention. Referring to FIG. 9, as another embodiment of the present invention, a cylindrical filter 36 made of metal is provided between the housing 31 and the collecting means 32 of the collecting unit 30 according to the first embodiment. It may further include.

The cylindrical filter 36 is installed to contact the outer surface of the collecting means 32 to support the collecting means 32, and may be electrically connected to the current applying means 33. Through this, while supporting the collecting means 32 from the outside, it is possible to further expand the contact area with the fine dust.

10 is a detailed view of a fourth embodiment of the collecting part of the present invention, in the fourth embodiment, when both the supporting means 35 of the second embodiment and the cylindrical filter 36 of the third embodiment are configured.

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

The scope of the present invention is not limited to the above-described embodiments, but may be implemented in various forms of embodiments within the scope of the appended claims. Any person having ordinary skill 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: classification unit
20a: classification body 21: nozzle
22: low-speed passage 23: high-speed passage
24: discharge unit 30: collection unit
31: housing 31a: air inlet
31b: air outlet 32: collection means
33: current application means 35: support means
36: cylindrical filter 40: measuring unit
F: fine dust F1: fine first dust
F2: 2nd fine dust

Claims (16)

A charging unit for electrically charging particles of air flowing into the microchannel, including a microchannel in which at least one of the sidewalls formed along the flow direction of the introduced air has an inclined surface;
A classification unit located at the front end or the rear end of the charged part and aerodynamically classifying fine dust contained in the inflowing air into relatively large first fine dust and relatively small second fine dust;
A collecting unit for collecting charged and classified fine dust; And,
A fine dust measuring device comprising a; measuring unit for measuring the concentration of the fine dust with an induced current value proportional to the concentration of the collected fine dust. According to claim 1,
A fine dust measuring device is formed so that the bottom surface of the fine channel gradually rises along the flow direction of 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 3,
The collecting unit fine dust measuring device further comprises a cylindrical filter of a metal material that is installed between the housing and the collecting means. According to claim 3,
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 3,
The collecting means is a metal mesh or metal cloth fine dust measuring device. It includes a micro-channel, a charging unit for electrically charging the particles of air flowing into the micro-channel;
A classification unit located at the front end or the rear end of the charged part and aerodynamically classifying fine dust contained in the inflowing air into relatively large first fine dust and relatively small second fine dust;
A collecting unit that collects fine dust by introducing charged and classified fine dust; And,
Includes a measuring unit for measuring the concentration with an induced current value proportional to the concentration of the collected fine dust;
The collecting unit,
A housing formed with inlets and outlets respectively formed to allow air to flow in and out; And,
A fine dust measuring device comprising a; collecting means for collecting charged fine particles by being electrically connected to and installed in a wound form inside the housing. The method of claim 7,
The collecting unit fine dust measuring device further comprises a cylindrical filter of a metal material that is installed between the housing and the collecting means. The method of claim 7,
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. The method of claim 7,
The collecting means is a metal mesh or metal cloth fine dust measuring device. The method of claim 7,
The fine channel is an apparatus for measuring fine dust in which left and right sidewalls in the flow direction of air are formed as inclined surfaces. The method of claim 11,
A fine dust measuring device is formed so that the bottom surface of the fine channel gradually rises along the flow direction of air. The method of claim 1 or 7,
The sorting unit may include 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 the first fine dust and the second fine dust flow, respectively, branched from the nozzle. The method of claim 13,
The low-speed flow path is formed to be located in a straight direction with the nozzle, the high-speed flow path is a fine dust measuring device is formed to be located in the vertical direction with the nozzle and the high-speed flow path. The method of claim 1 or 7,
The charged part and the sorting part 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 fine dust measuring device in which a sealing part is interposed between the body and the substrate. The method of claim 1 or 7,
The first fine dust is greater than 2.5㎛ particle size, the second fine dust is less than 2.5㎛ particle size measuring device.

Images