Particle collection device and particle collection method using the same

Abstract

To provide a particle collection device which can inhibit reduction of a particle collection solution from a stirring container.SOLUTION: A particle collection device 1 includes an outer cylinder 2, an inner cylinder 3, a spiral plate 4, and a stirring container 5. Air A is guided to the outer cylinder 2 from the outside. The inner cylinder 3 is disposed within the outer cylinder 2. The spiral plate 4 is disposed between the outer cylinder 2 and the inner cylinder 3 and guides the air A downward while swirling the air A. The stirring container 5 is connected to the lower side of the outer cylinder 2 and stirs a particle collection solution L with the swirling air A from the outer cylinder 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a particle collecting device and a particle collecting method using the same. [Background technology]

[0002] A particle collection device is a device that collects particles contained in the air. When equipped with a mechanism for measuring the collected particles, the particle collection device becomes a particle measurement device.

[0003] Conventional particle measuring devices are equipped with a swirl-promoting surface (see, for example, Patent Document 1). The swirl-promoting surface guides air introduced into the device upward while swirling. In the particle measuring device described in Patent Document 1, the air introduced into the device swirls, so that the destinations of particles contained in the air vary depending on the size of their particle diameter. Once the particles are introduced to their destinations, they are measured according to their particle diameter. Therefore, the particle measuring device described in Patent Document 1 is capable of measuring even small particles with high accuracy. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-190998 Summary of the Invention [Problem to be solved by the invention]

[0005] Generally, it is effective to use a particle-collecting solution to collect particles. The particle-collecting solution is contained in an agitating vessel and agitated with air to collect particles contained in the air.

[0006] However, the particle measuring device described in Patent Document 1 is not designed to use a particle collection solution. Therefore, if a particle collection solution is used with the particle measuring device described in Patent Document 1, the particle collection solution will be carried away little by little by the swirling air that is guided upward, and will gradually decrease.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a particle collection device that can suppress the loss of particle collection solution from a stirring vessel, and a particle collection method using the same. [Means for solving the problem]

[0008] According to one aspect of the present invention, a particle collection device includes an outer cylinder, an inner cylinder, a spiral plate, and a stirring vessel. Air is introduced into the outer cylinder from the outside. The inner cylinder is disposed inside the outer cylinder. The spiral plate is disposed between the outer and inner cylinders and introduces the air downward while swirling it. The stirring vessel is connected below the outer cylinder and stirs the particle collection solution with the swirling air from the outer cylinder.

[0009] According to another aspect of the present invention, a particle collection device includes an outer cylinder, an inner cylinder, a stirring container, a sprayer, and a circulation path. Air is introduced into the outer cylinder from the outside. The inner cylinder is disposed inside the outer cylinder. The stirring container is connected below the outer cylinder and stirs the particle collection solution with swirling air from the outer cylinder. The sprayer sprays the particle collection solution into the air introduced into the outer cylinder from the outside. The circulation path circulates the particle collection solution from the stirring container to the sprayer. [Effects of the Invention]

[0010] According to the particle collecting device and the particle collecting method using the same of the present invention, it is possible to suppress the loss of particle collection solution from the stirring vessel. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic vertical cross-sectional view of a particle collecting device according to a first embodiment. [Figure 2]FIG. 10 is a schematic vertical cross-sectional view of a particle collecting device according to a second embodiment. [Figure 3] FIG. 10 is a schematic vertical cross-sectional view of a particle collecting device according to a third embodiment. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. [Figure 5] FIG. 11 is a schematic vertical cross-sectional view of a particle collecting device according to a modified example of the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and the description will not be repeated. In the following description, terms meaning specific positions and directions, such as "upper," "lower," "left," "right," "front," or "rear," may be used. However, these terms are used for convenience to facilitate understanding of the contents of the embodiments, and do not relate to the directions when actually implemented. [Embodiment 1]

[0013] A particle collecting device 1 according to the first embodiment will be described with reference to Fig. 1. Fig. 1 is a schematic vertical cross-sectional view of the particle collecting device 1 according to the first embodiment.

[0014] As shown in FIG. 1, particle collection device 1 includes outer cylinder 2, inner cylinder 3, spiral plate 4, and stirring vessel 5. Air A is introduced into outer cylinder 2 from the outside. Inner cylinder 3 is disposed inside outer cylinder 2. Spiral plate 4 is disposed between outer cylinder 2 and inner cylinder 3 and introduces air A downward while swirling it. Spiral plate 4 is inclined downward toward outer cylinder 2; in other words, it is preferably inclined upward toward inner cylinder 3. Stirring vessel 5 is connected below outer cylinder 2 and stirs particle collection solution L with the swirling air A from outer cylinder 2. The air A that has stirred particle collection solution L passes from bottom to top inside inner cylinder 3 and is discharged. Meanwhile, particle collection solution L captures particles contained in air A through stirring. Therefore, if viruses or other contaminants are attached to particles, the viruses or other contaminants will be collected in particle collection solution L along with the particles through stirring.

[0015] The spiral plate 4 swirls the air A while directing it downward, and the air A is straightened downward in the swirling direction and the axial direction of the inner cylinder 3. In other words, the air A swirling while being directed into the stirring vessel 5 by the spiral plate 4 becomes a flow suitable for stirring the particle collection solution L. Therefore, the particle collection solution L is properly stirred and is less likely to be carried away by the air A discharged from the inner cylinder 3. As a result, it is possible to prevent the particle collection solution L from being lost from the stirring vessel 5.

[0016] In particular, by inclining the spiral plate 4 downward toward the outer cylinder 2, the air A that is swirled by the spiral plate 4 and introduced into the stirring vessel 5 becomes a flow that is more suitable for stirring the particle collection solution L. Therefore, the particle collection solution L is more appropriately stirred, and is less likely to be carried away by the air A discharged from the inner cylinder 3. As a result, the loss of particle collection solution L from the stirring vessel 5 can be further suppressed.

[0017] The axial direction of the spiral plate 4, together with the outer cylinder 2 and the inner cylinder 3, is the vertical direction. The spiral plate 4 is a plate that is arranged spirally around the outer periphery of the inner cylinder 3 and along the axial direction of the inner cylinder 3. Preferably, the angle θ between the top surface of the spiral plate 4 and the horizontal plane is 15° or more and 45° or less. More preferably, the angle θ between the horizontal plane and the top surface of the spiral plate 4 is 25° or more and 35° or less. Due to this angle θ, the air A that is introduced into the stirring vessel 5 while swirling becomes a flow that is more suitable for stirring the particle collection solution L. Therefore, the particle collection solution L is more appropriately stirred and is less likely to be carried by the air A discharged from the inner cylinder 3. As a result, loss of the particle collection solution L from the stirring vessel 5 can be further suppressed.

[0018] Preferably, the spiral plate 4 is attached to the outer peripheral surface of the inner cylinder 3. This rectifies the flow of the air A in the swirling direction and downward in the axial direction of the inner cylinder 3. In other words, the air A that is swirled by the spiral plate 4 and introduced into the stirring vessel 5 becomes a flow that is more suitable for stirring the particle collection solution L. Therefore, the particle collection solution L is more appropriately stirred, and is less likely to be carried away by the air A discharged from the inner cylinder 3. As a result, loss of the particle collection solution L from the stirring vessel 5 can be further suppressed.

[0019] Preferably, the outer peripheral end of the spiral plate 4 does not contact the inner peripheral surface of the outer cylinder 2. This allows the particle collection solution L adhering to the inner peripheral surface of the outer cylinder 2 to flow along the inner peripheral surface of the outer cylinder 2 and be guided to the stirring vessel 5. This further prevents the particle collection solution L from being lost from the stirring vessel 5.

[0020] Preferably, the lower end of the spiral plate 4 is located below the vertical middle of the outer cylinder 2. More preferably, the spiral of the spiral plate 4 is at least half a turn (even more preferably at least one turn). The spiral plate 4 makes it difficult for the particle collection solution L to flow back to the side of the outer cylinder 2 that introduces air A. This makes it possible to further prevent the particle collection solution L from being lost from the stirring vessel 5.

[0021] The particle collection solution L is not limited to water or a solution using water as a medium, and may be a liquid to which additives have been added. Addition of additives has the effect of promoting particle capture, stabilizing the particles, and contributing to the stabilization of the particle collection solution L. Examples of additives include pH adjusters, buffers, antioxidants, antibacterial agents, antibiotics, chelating agents, nutrients, surfactants, antifoaming agents, and culture media, but the presence or absence of these is not particularly limited.

[0022] Preferably, the stirring vessel 5 has an inner diameter that decreases toward the bottom; in other words, the inner circumferential surface is in an inverted cone shape. This is because the particle collection solution L in the stirring vessel 5 has a large area at the top surface that comes into contact with the air A. As a result, particles contained in the air A are efficiently collected by the particle collection solution L, and the velocity of the air A introduced into the stirring vessel 5 does not need to be high. Therefore, the stirred particle collection solution L is less likely to be carried by the air A discharged from the inner cylinder 3, and loss from the stirring vessel 5 can be further reduced. Furthermore, because the stirring vessel 5 has an inverted cone shape, when the intake velocity of the air A is high, the particle collection solution L rises along the inverted cone shape. Therefore, the particle collection solution L is less likely to be carried by the air A discharged from the inner cylinder 3, and loss from the stirring vessel 5 can be further reduced. The stirring vessel 5 may have a base 51 at its lower end.

[0023] The particle collecting device 1 may be configured to introduce air A from the outside to the outer cylinder 2, and may include an air introduction section 10 that introduces air A to the outer cylinder 2, and an air pump (not shown) that sends air A from the outside to the air introduction section 10. The air pump (not shown) is not limited to one that sends air A from the upstream side of air A, but may also be one that sucks air A from the downstream side of air A. [Embodiment 2]

[0024] A particle collecting device 1 according to a second embodiment will be described with reference to Fig. 2. Fig. 2 is a schematic vertical cross-sectional view of the particle collecting device 1 according to the second embodiment. The second embodiment differs from the first embodiment in that it does not need to include a spiral plate 4 and in that it includes a sprayer 6 and a circulation path 7. The differences between the second embodiment and the first embodiment will be described below.

[0025] As shown in FIG. 2, the particle collecting device 1 further includes a sprayer 6 and a circulation path 7. The sprayer 6 sprays the particle collecting solution L into the air A introduced from the outside into the outer cylinder 2. The sprayer 6 is provided, for example, in the air introduction section 10. The circulation path 7 circulates the particle collecting solution L from the stirring vessel 5 to the sprayer 6.

[0026] The particle collection solution L, which has collected particles in the agitator vessel 5, travels from the agitator vessel 5 to the sprayer 6 via a circulation path 7. The particle collection solution L that has reached the sprayer 6 is sprayed by the sprayer 6 onto air A, which is being led from the outside to the outer cylinder 2. The sprayed particle collection solution L becomes mist-like, so the surface area that comes into contact with the air A is large. As a result, the particles contained in the air A are efficiently collected by the particle collection solution L, and it is not necessary to increase the speed of the air A that is led into the agitator vessel 5. Therefore, the particle collection solution L that is being stirred is even less likely to be carried by the air A that is discharged from the inner cylinder 3, and loss from the agitator vessel 5 can be further reduced.

[0027] Preferably, the sprayer 6 further increases the surface area of ​​the particle-collecting solution L that comes into contact with the air A. Specifically, the sprayer 6 continuously sprays the particle-collecting solution L in the form of a mist with a diameter of 200 μm or less, and the spray flow rate is 100 mm 3 / s or more. Because the particles contained in the air A are efficiently collected in the particle-collection solution L by the sprayer 6, it is not necessary to increase the velocity of the air A introduced into the stirring vessel 5. Therefore, the particle-collection solution L being stirred is even less likely to be carried by the air A discharged from the inner cylinder 3, and loss of the solution from the stirring vessel 5 can be further suppressed.

[0028] Preferably, the upstream end of the circulation path 7 is connected to the bottom of the stirring vessel 5. This is because, even if the liquid level of the particle collection solution L changes due to stirring, the particle collection solution L remains stable at the bottom of the stirring vessel 5. For this reason, the particle collection solution L reaches the sprayer 6 from the stirring vessel 5 via the circulation path 7 in a stable manner. When the particle collection solution L is stably sprayed from the sprayer 6, it is not necessary to increase the speed of the air A introduced into the stirring vessel 5. Therefore, the particle collection solution L being stirred is even less likely to be carried by the air A discharged from the inner cylinder 3, and loss of the particle collection solution L from the stirring vessel 5 can be further prevented.

[0029] Although not shown, a detector for detecting particles or viruses attached to the particles may be connected to the circulation path 7. Since the particle collection solution L circulated through the circulation path 7 collects particles again, the concentration of particles in the particle collection solution L increases. When the concentration of particles in the particle collection solution L increases, it becomes easier for the detector to detect the particles or viruses attached to the particles.

[0030] FIG. 2 shows a state in which the air A introduced into the stirring container 5 is swirling. However, the particle collection device 1 does not necessarily need to swirl the air A introduced into the stirring container 5, and it is sufficient to stir the particle collection solution L. Note that the particle collection device 1 can swirl the air A depending on the angle of the air A introduced from the outside into the outer cylinder 2 even without including the spiral plate 4. [Embodiment 3]

[0031] Referring to FIGS. 3 and 4, the particle collection device 1 according to Embodiment 3 will be described. FIG. 3 is a schematic longitudinal sectional view of the particle collection device 1 according to Embodiment 3. FIG. 4 is a sectional view taken along line IV-IV of FIG. 3. In Embodiment 3, further configurations are provided in combination with Embodiments 1 and 2. Hereinafter, the further configurations will be mainly described. In FIG. 3, for ease of understanding of the drawing, the air A between the outer cylinder 2 and the inner cylinder 3 and the air A introduced into the stirring container 5 are omitted.

[0032] As shown in FIG. 3, the particle collection device 1 includes an outer cylinder 2, an inner cylinder 3, a spiral plate 4, a stirring container 5, a sprayer 6, and a circulation path 7, similar to the configurations of Embodiments 1 and 2.

[0033] As a further configuration, the particle collection device 1 includes an exhaust pipe 8. The exhaust pipe 8 is connected above the inner cylinder 3 and discharges the air A from the inner cylinder 3 to the outside from the upper end. The exhaust pipe 8 has the same diameter as the outer cylinder 2 or a larger diameter than the outer cylinder 2 (D≧d), and is longer in the axial direction than in the radial direction (D<H). Preferably, the exhaust pipe 8 has an exhaust pipe 80 at the upper part and a funnel part 81 at the lower part. The funnel part 81 has a reduced diameter downward.

[0034] The particle collection solution L carried by the air A from the inner cylinder 3 tends to adhere to the inner surface of the exhaust cylinder 8. This is because the air A introduced from the inner cylinder 3 to the exhaust cylinder 8 continues to swirl in the outer cylinder 2 and inner cylinder 3. Because the air A continues to swirl inside the exhaust cylinder 8, the particle collection solution L carried by the air A adheres to the inner surface of the exhaust cylinder 8. The particle collection solution L that has adhered to the inner surface of the exhaust cylinder 8 flows along the inner surfaces of the exhaust cylinder 8 and inner cylinder 3 and returns to the stirring vessel 5. Because the exhaust cylinder 8 has a funnel section 81 at its bottom, the particle collection solution L that has adhered to the inner surface of the exhaust cylinder 8 quickly flows down the inner surface of the funnel section 81 due to its own weight and quickly returns to the stirring vessel 5. This further reduces the loss of the particle collection solution L from the stirring vessel 5.

[0035] When the particle collection solution L is sprayed into the air A introduced into the outer cylinder 2, the atomized particle collection solution L carried by the swirling air A tends to adhere to the outer peripheral surface of the inner cylinder 3. The particle collection solution L that has adhered to the outer peripheral surface of the inner cylinder 3 flows down the outer peripheral surface of the inner cylinder 3 to the bottom end, then rises up the inner peripheral surface of the inner cylinder 3, and is easily carried by the air A that is discharged from the inner cylinder 3.

[0036] However, because the spiral plate 4 is attached to the outer peripheral surface of the inner cylinder 3, even if the particle collection solution L adheres to the outer peripheral surface of the inner cylinder 3, it is guided by the spiral plate 4 to the inner peripheral surface of the outer cylinder 2. For this reason, the particle collection solution L is less likely to reach the bottom end of the outer peripheral surface of the inner cylinder 3, and is less likely to rise up the inner peripheral surface of the inner cylinder 3. Therefore, the particle collection solution L is even less likely to be carried by the air A discharged from the inner cylinder 3, and loss of the particle collection solution L from the stirring vessel 5 can be further suppressed.

[0037] In particular, because the spiral plate 4 is inclined downward toward the outer cylinder 2, the air A that is swirling and guided into the stirring vessel 5 by the spiral plate 4 is more likely to cause the particle collection solution L that it is carrying to adhere to the inner circumferential surface of the outer cylinder 2 than to the outer circumferential surface of the inner cylinder 3. For this reason, the particle collection solution L is less likely to reach the bottom end of the outer circumferential surface of the inner cylinder 3, and is less likely to rise along the inner circumferential surface of the inner cylinder 3. Therefore, the particle collection solution L is even less likely to be carried by the air A discharged from the inner cylinder 3, and loss of the particle collection solution L from the stirring vessel 5 can be further suppressed.

[0038] The inner peripheral surface of the outer cylinder 2 has grooves 21 (hereinafter referred to as vertical grooves 21) that run in the vertical direction. Because the spiral plate 4 is inclined downward toward the outer cylinder 2, the air A that is swirled by the spiral plate 4 and guided into the stirring vessel 5 easily causes the atomized particle collection solution L to adhere to the inner peripheral surface of the outer cylinder 2. The particle collection solution L that has adhered to the inner peripheral surface of the outer cylinder 2 flows down the vertical grooves 21 and is guided into the stirring vessel 5. This makes it possible to further prevent the particle collection solution L from being lost from the stirring vessel 5.

[0039] The vertical grooves 21 extend from the height at which air A is introduced into the outer cylinder 2 to the lower end of the outer cylinder 2. As shown in Fig. 4, there are multiple (for example, four) vertical grooves 21, and they are formed at equal intervals. By forming the vertical grooves 21 at equal intervals, the particle collection solution L is efficiently taken into the vertical grooves 21 from the swirling air A.

[0040] In cross-sectional view, each vertical groove 21 has a shape such that a rear surface 21f is positioned further in the direction of travel of air A than an opening surface 21m. Due to this shape, each vertical groove 21 efficiently takes in particle collection solution L from the swirling air A into vertical groove 21.

[0041] By efficiently taking in the particle collection solution L from the swirling air A into the vertical grooves 21, the particle collection solution L is not discharged together with the air A but is guided along the vertical grooves 21 into the stirring vessel 5. This makes it possible to further prevent the particle collection solution L from being lost from the stirring vessel 5. [Experimental Example]

[0042] In order to investigate how much the exhaust pipe 8, the spiral plate 4, and the four longitudinal grooves 21 described in the third embodiment contribute to the effect, the following experiments shown in Experimental Examples 1 to 4 were carried out.

[0043] In Experimental Example 1, a particle collector 1 according to Embodiment 3 was used that did not have the spiral plate 4 and the four longitudinal grooves 21. In Experimental Example 2, a particle collector 1 according to Embodiment 3 was used that did not have the spiral plate 4. In Experimental Example 3, a particle collector 1 according to Embodiment 3 was used that did not have the four longitudinal grooves 21. In Experimental Example 4, a particle collector 1 according to Embodiment 3 was used.

[0044] In all of Experimental Examples 1 to 4, the experimental conditions were a test time of 5 minutes, a flow rate of air A introduced from the outside into the outer cylinder 2 of 5000 cm 3 / s], particle collection solution L was water, inner diameter D of exhaust tube 8 was 50 [mm], axial length H of exhaust tube 8 was 60 [mm], inner diameter d of outer tube 2 was 40 [mm], height of outer tube 2 was 65 [mm], height of stirring vessel 5 was 120 [mm], and inclination of the inner surface of stirring vessel 5 with respect to the vertical axis was 10 [°].

[0045] Other experimental conditions and experimental results in Experimental Examples 1 to 4 are shown in Table 1 below.

[0046] [Table 1]

[0047] As shown in Table 1, in Experimental Example 4, the "average of the left column," i.e., the "post-experiment average weight" of the "weight of the particle collection solution in the entire particle collection device" (hereinafter referred to as the "post-experiment average weight"), was large at 11.47 g. Furthermore, the particle collection solution L did not disappear from the stirring vessel 5, which was the most favorable result.

[0048] In Experimental Example 3, the "average of the left column," i.e., the average weight after the experiment, was 11.82 g, the largest. However, since most of the particle collection solution L remained in the exhaust stack 8 rather than the stirring vessel 5, this is not the most preferable result. Therefore, this was the second most preferable result.

[0049] In Experimental Example 2, the "average of the left column," i.e., the average weight after the experiment, was 9.83 g, the smallest. However, the number of times that particle collection solution L disappeared from stirring vessel 5 was once, the same as in Experimental Example 1, and the time until particle collection solution L disappeared from stirring vessel 5 was 5 minutes 00 seconds, which was longer than in Experimental Example 1, so it cannot be said to be the least favorable. Therefore, it was the third most favorable result.

[0050] In Experimental Example 1, as explained above in Experimental Examples 2 to 4, the fourth most favorable results were obtained.

[0051] From the experimental results of Experimental Examples 1 to 4, the most preferable is the configuration of Experimental Example 4, i.e., the particle collector 1 according to Embodiment 3. The next preferable is the configuration of Experimental Example 3, i.e., the particle collector 1 according to Embodiment 3 without the four longitudinal grooves 21. The next preferable is the configuration of Experimental Example 2, i.e., the particle collector 1 according to Embodiment 3 without the spiral plate 4. The next preferable is the configuration of Experimental Example 1, i.e., the particle collector 1 according to Embodiment 3 without the spiral plate 4 and the four longitudinal grooves 21.

[0052] Even if the particle collection device 1 according to the third embodiment does not have the exhaust pipe 8, the spiral plate 4, and the four vertical grooves 21, it is possible to suppress the decrease in the particle collection solution L from the stirring vessel 5 as long as the sprayer 6 and the circulation path 7 are provided, as described in the second embodiment.

[0053] The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above embodiments and can be embodied in various forms without departing from the spirit of the present invention. The drawings mainly show each component in a schematic manner to facilitate understanding, and the thickness, length, number, spacing, etc. of each component shown in the drawings may differ from the actual ones due to the convenience of creating the drawings. Furthermore, the speed, material, shape, dimensions, etc. of each component shown in the above embodiments are merely examples and are not particularly limited, and various modifications are possible within a range that does not substantially deviate from the configuration of the present invention.

[0054] In the first to third embodiments, the inside of the inner cylinder 3 was not described in detail. Here, as shown in Fig. 5, the particle collection device 1 may include a small cylinder 30 arranged inside the inner cylinder 3, and a ring-shaped plate 31 that connects the upper end of the inner cylinder 3 to the upper end of the small cylinder 30, thereby sealing them. When the particle collection solution L rises along the inner circumferential surface of the inner cylinder 3, even if it reaches the upper end of the inner circumferential surface of the inner cylinder 3, it is prevented from being discharged to the outside because it is blocked by the ring-shaped plate 31 and the small cylinder 30. This makes it possible to further prevent the particle collection solution L from being lost from the stirring vessel 5.

[0055] In the first to third embodiments, no explanation has been given regarding the types of particles that are collected in the particle collection solution L. Here, the particles are not particularly limited as long as they can be collected in the particle collection solution L. Examples of particles include so-called dust, dirt, and aerosols that exist in the gas phase, as well as biological substances such as spores and microorganisms, viruses, and complexes thereof.

[0056] In the first and second embodiments, the exhaust pipe 8 and the vertical grooves 21 described in the third embodiment are not described. Here, the first and second embodiments may include one or both of the exhaust pipe 8 and the vertical grooves 21. Note that the vertical grooves 21 provided in the first embodiment are sufficient if they extend up to the height of the lowest stage of the spiral plate 4 (the lower surface of which faces the stirring vessel 5). [Industrial Applicability]

[0057] The present invention provides a particle collecting device and has industrial applicability. [Explanation of symbols]

[0058] A. Air L particle collection solution 1 Particle collection device 2 outer cylinder 3 Inner cylinder 4 spiral plate 5 Stirring vessel 6 sprayer 7 Circulation Route 8 Exhaust stack 10 Air intake section 21 Vertical grooves 30 Small tube 31 Ring Plate 51 Foundation 80 Exhaust pipe 81 Funnel part

Claims

1. an outer cylinder into which air is introduced from the outside; an inner cylinder disposed inside the outer cylinder; a spiral plate disposed between the outer cylinder and the inner cylinder for swirling and directing air downward; a stirring vessel connected below the outer cylinder for stirring the particle collection solution with swirling air from the outer cylinder; an exhaust pipe connected to the top of the inner pipe and discharging air from the inner pipe to the outside; Equipped with the exhaust tube has the same diameter as the outer tube or a larger diameter than the outer tube, and is longer in the axial direction than in the radial direction; The particle collecting device, wherein the exhaust stack has a funnel portion at a lower portion, the diameter of which decreases downward and the lower end of which is connected to the upper end of the inner tube.

2. The particle collection device according to claim 1 , wherein the spiral plate is inclined downward toward the outer cylinder.

3. a sprayer that sprays the particle collection solution into air that is introduced into the outer cylinder from the outside; a circulation path for circulating the particle collection solution from the stirring vessel to the sprayer; The particle collecting device according to claim 1 or claim 2, further comprising:

4. The particle collecting device according to claim 1 , wherein the spiral plate is attached to an outer peripheral surface of the inner cylinder.

5. an outer cylinder into which air is introduced from the outside; an inner cylinder disposed inside the outer cylinder; a stirring vessel connected below the outer cylinder for stirring the particle collection solution with air from the outer cylinder; a sprayer that sprays the particle collection solution into air that is introduced into the outer cylinder from the outside; a circulation path for circulating the particle collection solution from the stirring vessel to the sprayer; an exhaust pipe connected to the top of the inner pipe and discharging air from the inner pipe to the outside; Equipped with the exhaust tube has the same diameter as the outer tube or a larger diameter than the outer tube, and is longer in the axial direction than in the radial direction; The particle collecting device, wherein the exhaust stack has a funnel portion at a lower portion, the diameter of which decreases downward and the lower end of which is connected to the upper end of the inner tube.

6. The particle collecting device according to claim 1 , wherein the inner peripheral surface of the outer cylinder has a groove extending in the vertical direction.

7. A particle collection method using the particle collection device according to any one of claims 1 to 6, comprising: Air is introduced into the outer cylinder from the outside, The particle collection method includes stirring the particle collection solution in the stirring vessel with air from the outer cylinder.

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