Particulate sampling device and method of sampling particulates

Abstract

A fine particle sampling device (10) includes: a first electrode (22) that is cylindrical, has a first opening at a first end in an axial direction of the cylinder and a second opening at a second end in the axial direction of the cylinder; a second electrode (24) that extends in the axial direction, is disposed in the first electrode with a space from an inner surface of the first electrode; a third electrode (25) that extends in the axial direction, is disposed in the first electrode with a space from the inner surface, is thicker than the second electrode, and is disposed at a different position in the axial direction than the second electrode; a supply portion (28) that supplies a liquid into the first electrode so that the liquid is stored on a portion of the inner surface of the first electrode in the axial direction; a voltage application portion (26) that applies a first voltage between the first electrode and the second electrode and applies a second voltage between the first electrode and the third electrode; a drive portion (32) that rotates the first electrode around a rotation axis that extends in the axial direction and passes through the first electrode; and a recovery portion (30) that recovers the stored liquid.

Description

Technical Field

[0001] This disclosure relates to a particle sampling device and a particle sampling method for sampling particles. Background Technology

[0002] Previously, devices and methods for sampling particles in gases using the inertia and centrifugal force of particles were known (see, for example, Patent Documents 1, 2, and 3). Patent Document 1 discloses a method that captures airborne microorganisms onto a membrane filter by drawing in air through the membrane filter. Patent Document 2 discloses an airborne microbial sampler that captures airborne microorganisms by colliding the air drawn in by the suction unit with a culture medium, thereby causing the airborne microorganisms to adhere to the culture medium. Patent Document 3 discloses a device that captures particles by separating them from the air using the centrifugal force generated by the swirling of the drawn-in air.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2008-161143

[0006] Patent Document 2: Japanese Patent Application Publication No. 2009-11265

[0007] Patent Document 3: Japanese Patent Application Publication No. 2012-52866 Summary of the Invention

[0008] However, in the aforementioned conventional configurations, aerosol particles separated from the drawn air tend to accumulate in a dry state, requiring an additional step of retrieving them from the solution for analysis. When the sampled particles are biological, it is impossible to maintain their activity during capture. Even when recovery into a liquid is intended to address these issues, achieving high concentrations requires significant time due to the large volume of solution, resulting in substantial pressure loss and / or high noise levels caused by the suction. Furthermore, the capture performance is highly dependent on the shape and / or size of the device, the suction speed, and / or the size of the target aerosol, leading to inefficient capture.

[0009] Electrostatic collection typically allows for efficient particle sampling by charging more particles through discharge. However, this discharge generates reactive substances such as ozone. These substances can oxidize the sampled particles, potentially negatively impacting post-sampling particle inspection.

[0010] This disclosure was made in view of the aforementioned prior art problems, and provides a particle sampling apparatus and a particle sampling method that can efficiently sample particles while suppressing the generation of active substances.

[0011] One technical solution disclosed herein relates to a particulate sampling device comprising: a first electrode, which is cylindrical, having a first opening at a first end located in the axial direction of the cylinder and a second opening at a second end located in the axial direction of the cylinder; a second electrode extending in the axial direction and disposed within the first electrode at a distance from the inner surface of the first electrode; and a third electrode extending in the axial direction and disposed within the first electrode at a distance from the inner surface of the first electrode, the third electrode being thicker than the second electrode, and in the axial direction, the third electrode... The positions of the first and second electrodes are different; a supply unit supplies liquid to the first electrode, causing the liquid to accumulate on a portion of the inner surface of the first electrode in the direction about its axis; a voltage application unit applies a first voltage between the first and second electrodes and a second voltage between the first and third electrodes; a drive unit rotates the first electrode about a rotation axis that extends in the direction about its axis and passes through the first electrode; and a recovery unit recovers the accumulated liquid.

[0012] One technical solution disclosed herein relates to a particle sampling method for a particle sampling device, the particle sampling device comprising: a first electrode, which is cylindrical, having a first opening at a first end in the axial direction of the cylinder and a second opening at a second end in the axial direction of the cylinder; a second electrode extending in the axial direction and disposed within the first electrode at a distance from the inner surface of the first electrode; and a third electrode extending in the axial direction and disposed within the first electrode at a distance from the inner surface of the first electrode, the third electrode being larger than the first electrode. The first electrode is coarse, and the position of the third electrode is different from that of the second electrode in the axial direction. The particle sampling method includes: supplying liquid into the first electrode, causing the liquid to accumulate on a portion of the inner surface of the first electrode in the axial direction; applying a first voltage between the first electrode and the second electrode, and applying a second voltage between the first electrode and the third electrode; rotating the first electrode about a rotation axis that extends in the axial direction and passes through the first electrode; and recovering the accumulated liquid.

[0013] One of the technical solutions disclosed herein relates to a particulate sampling device and a particulate sampling method that can efficiently sample particulates while suppressing the generation of active substances. Attached Figure Description

[0014] Figure 1 This is a perspective view showing the appearance of the particulate sampling device according to the first embodiment.

[0015] Figure 2 It means Figure 1 A side view of the appearance of the particle sampling device.

[0016] Figure 3 yes Figure 1 Sectional view along line III-III.

[0017] Figure 4 yes Figure 1 Sectional view along line IV-IV.

[0018] Figure 5 It means Figure 1 A block diagram illustrating the structure of a particulate sampling device.

[0019] Figure 6 It means Figure 1 A flowchart illustrating an example of the operation of a particulate sampling device.

[0020] Figure 7 yes Figure 1 The section view along line III-III is used to illustrate... Figure 1 An illustrative diagram illustrating an example of the operation of a particulate sampling device.

[0021] Figure 8 This is a graph showing the experimental results of experiments conducted to determine ozone generation and dust collection efficiency with and without a covering.

[0022] Figure 9 This is a cross-sectional view of the particulate sampling device according to the second embodiment.

[0023] Figure 10 This is a cross-sectional view of the particulate sampling device according to the third embodiment. Detailed Implementation

[0024] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0025] However, the particulate sampling apparatus and particulate sampling method disclosed herein are not intended to be limited to the embodiments described below and / or the configurations shown in the accompanying drawings, but also include equivalent configurations.

[0026] The embodiments described below are general or specific examples. The values, shapes, materials, constituent elements, their arrangement, connection methods, steps, and order of steps shown in the following embodiments are examples and are not intended to limit the scope of the claimed protection. The figures are not strictly illustrative. In the figures, substantially identical components are sometimes given the same reference numerals, and repeated descriptions are omitted or simplified.

[0027] In the following, terms such as parallel and perpendicular that indicate the relationship between elements, terms such as cylindrical shape that indicate the shape of elements, and numerical ranges do not have a strict meaning, but rather mean that they also include substantially equivalent ranges, such as differences of about a few percent.

[0028] In the following figures, the X-axis and Y-axis are mutually orthogonal axes on the horizontal plane. The Z-axis is perpendicular to the horizontal plane. On the Z-axis, a positive direction indicates vertical upward, and a negative direction indicates vertical downward.

[0029] (First Embodiment)

[0030] Figure 1 This is a perspective view showing the appearance of the particulate sampling device 10 according to the first embodiment. Figure 2 It means Figure 1 A side view of the appearance of the particle sampling device 10. Figure 3 yes Figure 1 An internal view of the particle sampling device 10 is shown. Figure 1 Sectional view along line III-III. Figure 4 yes Figure 1 A sectional view along line IV-IV. Furthermore, in Figure 1 The illustration of wind speed sensor 34, etc., is omitted in the text. (Refer to...) Figures 1-4 The particulate sampling device 10 according to the first embodiment will be described.

[0031] like Figures 1-4 As shown, the particulate sampling device 10 is a device for sampling particulates in a liquid. Specifically, the particulate sampling device 10 is a device for sampling particulates in a liquid 68 (described later) by capturing particulates in a gas. Examples of particulates include fungi, bacteria, viruses, and aerosols. The particulate sampling device 10 includes a duct 12, a first bearing seal 14, a second bearing seal 16, a first flange member 18, a second flange member 20, a first electrode 22, a second electrode 24, a third electrode 25, a voltage application unit 26, a supply unit 28, a recovery unit 30, a drive unit 32, a wind speed sensor 34, a gas concentration sensor 36, a liquid concentration sensor 38, and a galvanometer 40.

[0032] The particulate sampling device 10 is constructed by a conduit 12, a first flange member 18, and a second flange member 20 surrounding a rotating first electrode 22, a second electrode 24, and a third electrode 25 disposed at the center of the first electrode 22. Inside the particulate sampling device 10, in the direction that allows the particulate sampling device 10 to be inserted (e.g., from...) Figure 2 Air or other gases can be passed through the particulate sampling device 10 in the direction indicated by arrow A. For example, air can be directly introduced into the particulate sampling device 10 via a pump (not shown). For example, the particulate sampling device 10 can be installed in a device that allows the flow of gases such as air, such as an air conditioner, air purifier, or ventilation port, and air can be introduced into the particulate sampling device 10 for processing. In this way, by installing the particulate sampling device 10 in a device that allows the flow of gases, it is not necessary to integrate a pump or the like for allowing the flow of gases into the particulate sampling device 10, and a small, quiet device with low pressure loss can be easily realized. As a result, the particulate sampling device 10 can be installed and integrated into a variety of locations with less selective placement. The various components of the particulate sampling device 10 will be described below.

[0033] The conduit 12 is cylindrical, and the first electrode 22 is rotatably supported inside the conduit 12. The conduit 12 has a main body 42, a first support portion 44, and a second support portion 46. The main body 42, the first support portion 44, and the second support portion 46 are insulating.

[0034] The main body 42 is cylindrical, with an opening at one end in the axial direction and an opening at the other end in the axial direction.

[0035] The first support portion 44 protrudes radially outward from one end of the main body 42 in the axial direction and is integrally formed with the main body 42. The first support portion 44 is recessed radially outward from the main body 42 and is approximately U-shaped (see reference). Figure 3 When viewed from the axial direction of the main body 42, the first support portion 44 is annular. A first bearing seal 14 is disposed on the inner side of the first support portion 44. The first bearing seal 14 seals the first support portion 44 and the first outer flange portion 58 (described later) to prevent gas leakage between the first support portion 44 and the first outer flange portion 58. The first support portion 44 rotatably supports the first electrode 22 via the first bearing seal 14.

[0036] The second support portion 46 protrudes radially outward from the other end of the main body 42 in the axial direction and is integrally formed with the main body 42. The second support portion 46 is recessed radially outward from the main body 42 and is generally U-shaped (see reference). Figure 3When viewed from the axial direction of the main body 42, the second support portion 46 is annular. A second bearing seal 16 is disposed on the inner side of the second support portion 46. The second bearing seal 16 seals the second support portion 46 and the second outer flange portion (described later) 60 so as to prevent gas leakage between the second support portion 46 and the second outer flange portion 60. The second support portion 46 rotatably supports the first electrode 22 via the second bearing seal 16.

[0037] The first flange member 18 is cylindrical and is connected to the pipe 12. The first flange member 18 has a body 48 and a flange 50.

[0038] The main body 48 is cylindrical, with an opening at one end in the axial direction and an opening at the other end in the axial direction. A flange 50 protrudes radially outward from one end of the main body 48 in the axial direction and is integrally formed with the main body 48. When viewed from the axial direction of the main body 48, the flange 50 is annular. The other end of the main body 48 in the axial direction is connected to one end of the conduit 12 in the axial direction.

[0039] The second flange member 20 is cylindrical and is connected to the pipe 12. The second flange member 20 has a body 52 and a flange 54.

[0040] The main body 52 is cylindrical, with an opening at one end in the axial direction and an opening at the other end in the axial direction. The axial end of the main body 52 is connected to the other end in the axial direction of the pipe 12. A flange 54 protrudes radially outward from the other end in the axial direction of the main body 52 and is integrally formed with the main body 52. ​​When viewed from the axial direction of the main body 52, the flange 54 is annular.

[0041] The first electrode 22 is cylindrical, with an opening at one end in the axial direction and an opening at the other end in the axial direction. The first electrode 22 is grounded via a second wire 76 (described later). The first electrode 22 has a body 56, a first outer flange 58, a second outer flange 60, a first inner flange 62, and a second inner flange 64. For example, the body 56, the first outer flange 58, the second outer flange 60, the first inner flange 62, and the second inner flange 64 are formed using stainless steel such as SUS.

[0042] The main body 56 is cylindrical, with an opening at one end in the axial direction and an opening at the other end in the axial direction. The axial direction of the main body 56 refers to the direction in which the axis B of the main body 56 extends (X-axis direction). The main body 56 has external teeth (not shown) on its outer peripheral surface that mesh with the external teeth (not shown) of the gear 86 (described later). The inner surface 66 of the main body 56 is subjected to a hydrophilic treatment. The hydrophilic treatment is a process that processes the inner surface 66 into a small irregular shape. For example, the hydrophilic treatment is performed by plasma treatment. For example, the hydrophilic treatment is performed by alkaline treatment using potassium hydroxide (KOH). An adhesion-inhibiting member is attached to the inner surface 66 of the main body 56 to inhibit the adhesion of microparticles. For example, the adhesion-inhibiting member is a blocker such as skim milk, BSA (bovine serum albumin), and PEG (polyethylene glycol). The axis of the main body 56 is aligned with the axis of the first electrode 22.

[0043] The first outer flange portion 58 protrudes radially outward from one end of the main body 56 in the axial direction and is integrally formed with the main body 56. The first outer flange portion 58 is annular around the axis B of the main body 56. That is, when viewed from the axial direction of the main body 56, the first outer flange portion 58 is annular. The first outer flange portion 58 is disposed inside the first bearing seal 14.

[0044] The second outer flange portion 60 protrudes radially outward from the other end of the main body 56 in the axial direction and is integrally formed with the main body 56. The second outer flange portion 60 is annular around the axis B of the main body 56. That is, when viewed from the axial direction of the main body 56, the second outer flange portion 60 is annular. The second outer flange portion 60 is disposed inside the second bearing seal 16.

[0045] The first inner flange portion 62 protrudes radially inward from one end of the main body 56 in the axial direction and is integrally formed with the main body 56. The first inner flange portion 62 is annular around the axis B of the main body 56. That is, when viewed from the axial direction of the main body 56, the first inner flange portion 62 is annular.

[0046] The second inner flange portion 64 protrudes radially inward from the other end of the main body 56 in the axial direction and is integrally formed with the main body 56. The second inner flange portion 64 is annular around the axis B of the main body 56. That is, when viewed from the axial direction of the main body 56, the second inner flange portion 64 is annular.

[0047] The first electrode 22 is positioned with the axis B of the main body 56 parallel to the horizontal direction. The first electrode 22 is supported in a manner that allows it to rotate about the axis B of the main body 56 (see reference). Figure 4 Arrow C). In other words, the first electrode 22 is supported in a manner that allows it to rotate.

[0048] The first electrode 22 has liquid 68 deposited on the inner surface 66 of the main body 56. Specifically, the first electrode 22 is located in the direction of the main body 56 about the axis B (refer to...). Figure 4 A portion of the inner surface 66 on arrow D) stores liquid 68. The stored liquid 68 is located below the axis B of the body 56. The first electrode 22 stores liquid 68 in this portion of the inner surface 66 along the axial direction of the body 56. The first inner flange 62 holds the liquid 68 so that the liquid 68 stored in the portion of the inner surface 66 of the body 56 does not overflow from one end of the body 56 in the axial direction. The second inner flange 64 holds the liquid 68 so that the liquid 68 held in the portion of the inner surface 66 of the body 56 does not overflow from the other end of the body 56 in the axial direction. Thus, the first electrode 22 has a structure that allows liquid 68 to be stored in a portion of the inner surface 66, and the liquid 68 is stored in a portion of the inner surface 66 of the body 56 so that the liquid 68 does not flow out to the outside of the body 56. Inside the body 56, a space 69 is formed above the stored liquid 68, penetrating the body 56 in the axial direction.

[0049] The second electrode 24 is linear and extends along the axial direction of the body 56 of the first electrode 22. The second electrode 24 is inserted radially inward at one end of the body 56 along the axial direction, located inside the body 56. The second electrode 24 protrudes outward along the axial direction of the body 56, relative to the opposite side of one end of the body 56. The second electrode 24 extends from a position opposite to one end of the first electrode 22 to a position within the first electrode 22 at a point G along the axial direction closer to one end of the first electrode 22. For example, the center G is the center between one end and the other end of the body 56 along the axial direction. The second electrode 24 faces the first inner flange 62 in a direction orthogonal to the axial direction of the body 56 of the first electrode 22.

[0050] The second electrode 24 is disposed with a gap between it and the inner surface 66 of the body 56 of the first electrode 22, and is disposed near the center of the first electrode 22. The second electrode 24 is disposed within the space 69. In this embodiment, the second electrode 24 is arranged with its axis aligned with the axis B of the body 56 of the first electrode 22. For example, the second electrode 24 is formed of tungsten or the like.

[0051] The second electrode 24 is disposed within the first electrode 22 at one end closer to the center G of the first electrode 22 in the axial direction, or at the other end closer to the center G of the first electrode 22. That is, the second electrode 24 is not disposed at the other end closer to the center G of the first electrode 22.

[0052] The configuration of the second electrode 24 can also be explained as follows. The first electrode 22 has a first opening at a first end located in the axial direction of the first electrode 22, and a second opening at a second end located in the axial direction of the first electrode 22. Within the first electrode 22, regarding the second electrode 24, (i) it is disposed between the first opening and the first surface, (ii) it is not disposed between the first surface and the second opening, and (iii) it is in direct contact with the third electrode 25 on the first surface. The distance between the first surface and the first opening is smaller than the distance between the first surface and the second opening, and the first surface is perpendicular to the axial direction of the first electrode 22.

[0053] The third electrode 25 extends along the axial direction of the body 56 of the first electrode 22. The third electrode 25 has a core member 100 and a covering member 102 covering the core member 100. The core member 100 is linear and extends along the axial direction of the body 56 of the first electrode 22. The covering member 102 is cylindrical and extends along the axial direction of the body 56 of the first electrode 22. Both the core member 100 and the covering member 102 are conductive.

[0054] A core member 100 is disposed inside the covering member 102, and the covering member 102 covers the outer side of the core member 100. For example, the covering member 102 can cover the core member 100 either in a state of being in close contact with the core member 100, or it can cover the core member 100 with a slight gap between the covering member 102 and the core member 100. The covering member 102 covers the core member 100 with at least a portion of the covering member 102 in contact with the core member 100 to achieve conductivity with the core member 100.

[0055] The third electrode 25 is disposed within the first electrode 22, spaced apart from the inner surface 66 of the body 56 of the first electrode 22. Specifically, the core member 100 and the cover member 102 are disposed spaced apart from the inner surface 66 of the body 56 of the first electrode 22, and are disposed near the center of the first electrode 22. The core member 100 and the cover member 102 are disposed within the space 69. In this embodiment, the core member 100 is arranged with its axis aligned with the axis B of the body 56 of the first electrode 22, and the cover member 102 is arranged with its axis aligned with the axis B of the body 56 of the first electrode 22.

[0056] The third electrode 25 is thicker than the second electrode 24. Here, thickness refers to the dimension in a direction orthogonal to the extension direction. That is, the thickness of the third electrode 25 is the dimension H1 of the third electrode 25 in a direction orthogonal to the axial direction of the body 56 of the first electrode 22, and the thickness of the second electrode 24 is the dimension H2 of the second electrode 24 in a direction orthogonal to the axial direction of the body 56 of the first electrode 22. The dimension H1 of the third electrode 25 in a direction orthogonal to the axial direction of the body 56 of the first electrode 22 is larger than the dimension H2 of the second electrode 24.

[0057] Furthermore, for example, if the shape of the third electrode 25 in a cross-section orthogonal to the extension direction is circular, the diameter of this shape is used as the thickness of the third electrode 25. For example, if the shape of the third electrode 25 in a cross-section orthogonal to the extension direction is not circular, the thickness of the third electrode 25 can be determined by the size of the thickest part of the shape, the size of the thinnest part of the shape, or the average of the sizes of the thickest and thinnest parts. If the thickness of the third electrode 25 varies at different positions in the extension direction, the thickness of the third electrode 25 can be determined by the size of the thickest part, the size of the thinnest part, or the average of the sizes of the thickest and thinnest parts. The same applies to the second electrode 24. If the shape of the second electrode 24 in a cross-section orthogonal to the extension direction is circular, the diameter of this shape is used as the thickness of the second electrode 24. For example, if the shape of the second electrode 24 in a cross-section orthogonal to the extension direction is not circular, the thickness of the second electrode 24 can be defined as either the size of the thickest part of the shape, the size of the thinnest part of the shape, or the average of the sizes of the thickest and thinnest parts. Similarly, if the thickness of the second electrode 24 varies at different locations along the extension direction, the thickness of the second electrode 24 can be defined as either the size of the thickest part, the size of the thinnest part, or the average of the sizes of the thickest and thinnest parts.

[0058] In this embodiment, the core member 100 has a thickness approximately the same as the second electrode 24, and the covering member 102 covers the core member 100, thereby making the third electrode 25 thicker than the second electrode 24. That is, in this embodiment, the covering member 102 is a member used to make the third electrode 25 thicker than the second electrode 24.

[0059] For example, the thickness of the second electrode 24 is such that a discharge such as corona discharge is generated when a voltage is applied between the first electrode 22 and the second electrode 24. Specifically, for example, the thickness of the second electrode 24 is such that a discharge such as corona discharge is easily generated when a voltage is applied between the first electrode 22 and the second electrode 24.

[0060] For example, the thickness of the third electrode 25 is such that it is difficult to generate a discharge such as corona discharge when a voltage is applied between the first electrode 22 and the third electrode 25. Specifically, for example, the thickness of the third electrode 25 is such that it does not generate a discharge such as corona discharge when a voltage is applied between the first electrode 22 and the third electrode 25.

[0061] The third electrode 25 is disposed at a position different from the second electrode 24 in the axial direction of the body 56 of the first electrode 22. In this embodiment, the third electrode 25 is disposed in the axial direction of the body 56 of the first electrode 22 at a position closer to the other end of the first electrode 22 than the second electrode 24. That is, in this embodiment, the second electrode 24 is disposed in the axial direction of the body 56 of the first electrode 22 at a position closer to the other end of the first electrode 22 than the third electrode 25.

[0062] Specifically, the core member 100 and the cover member 102 are arranged at positions different from those of the second electrode 24 in the axial direction of the body 56 of the first electrode 22. When viewed from one end side in the axial direction of the body 56 of the first electrode 22, the second electrode 24 is located closer to the front than the core member 100 and the cover member 102, while the core member 100 and the cover member 102 are located further inward than the second electrode 24. Therefore, when gas flows into the first electrode 22 from this end, the gas passes between the second electrode 24 and the first electrode 22, then between the cover member 102 and the first electrode 22, and is then released from the other end of the first electrode 22 to the outside of the first electrode 22.

[0063] The third electrode 25 is arranged with the second electrode 24 in the axial direction of the body 56 of the first electrode 22. Specifically, the core member 100 and the cover member 102 are arranged with the second electrode 24 in the axial direction of the body 56 of the first electrode 22. When viewed from the axial direction of the body 56 of the first electrode 22, the core member 100 overlaps with the second electrode 24, and the core member 100 is arranged with the second electrode 24 in the axial direction of the body 56 of the first electrode 22. When viewed from the axial direction of the body 56 of the first electrode 22, at least a portion of the second electrode 24 is located inside the outer shape of the cover member 102, and the cover member 102 is arranged with the second electrode 24 in the axial direction of the body 56 of the first electrode 22.

[0064] Within the first electrode 22, the third electrode 25 is longer than the second electrode 24. That is, the length of the third electrode 25 within the first electrode 22 is longer than the length of the second electrode 24 within the first electrode 22. Here, length refers to the dimension in the extending direction. Specifically, the length of the third electrode 25 within the first electrode 22 is the dimension I1 of the portion of the third electrode 25 located within the first electrode 22 in the axial direction of the body 56 of the first electrode 22. The length of the second electrode 24 within the first electrode 22 is the dimension I2 of the portion of the second electrode 24 located within the first electrode 22 in the axial direction of the body 56 of the first electrode 22. The dimension I1 of the portion of the third electrode 25 located within the first electrode 22 is larger than the dimension I2 of the portion of the second electrode 24 located within the first electrode 22. Specifically, the dimension I1 of the portion of the core member 100 located within the first electrode 22 is larger than the dimension I2 of the portion of the second electrode 24 located within the first electrode 22. The size I1 of the portion of the cover member 102 located within the first electrode 22 is larger than the size I2 of the portion of the second electrode 24 located within the first electrode 22.

[0065] The third electrode 25 extends from a position closer to the center G of the first electrode 22 to one end of the first electrode 22, and then to a position opposite to that end of the first electrode 22. Specifically, the core member 100 and the cover member 102 extend from a position closer to the center G of the first electrode 22 to one end of the body 56 of the first electrode 22, and then to a position opposite to that end of the body 56 of the first electrode 22. That is, the core member 100 and the cover member 102 are inserted radially inward at the other end of the body 56 of the first electrode 22 in the axial direction, and protrude outward at the opposite end of the other end of the body 56, that is, outward. The cover member 102 faces the second inner flange 64 in a direction orthogonal to the axial direction of the body 56 of the first electrode 22.

[0066] The configuration of the third electrode 25 can also be explained as follows. The first electrode 22 has a first opening at a first end located in the axial direction of the first electrode 22 and a second opening at a second end located in the axial direction of the first electrode 22. Within the first electrode 22, regarding the third electrode 25, (i) it is not disposed between the first opening and the first surface, (ii) it is disposed between the first surface and the second opening, and (iii) it is in direct contact with the second electrode 24 on the first surface. The distance between the first surface and the first opening is smaller than the distance between the first surface and the second opening, and the first surface is perpendicular to the axial direction of the first electrode 22.

[0067] At least a portion of the third electrode 25 is integrally formed with the second electrode 24. Specifically, the core member 100 is integrally formed with the second electrode 24 such that the second electrode 24 and the core member 100 are continuous in the axial direction of the body 56 of the first electrode 22. On the other hand, the cover member 102 is separate from the core member 100 and the second electrode 24 and is not integrally formed with the second electrode 24.

[0068] In this embodiment, the second electrode 24 and the core member 100 are formed by a conductive member having conductivity. The portion of the conductive member covered by the covering member 102 is the core member 100, and the portion exposed outside the covering member 102 is the second electrode 24. For example, the core member 100 is integrally formed with the second electrode 24 using tungsten or the like, and the covering member 102 is formed using stainless steel such as SUS.

[0069] For example, the second electrode 24 and the third electrode 25 can also be constructed by further covering a portion of the linear electrode with a conductive material. In this case, the covered position of the electrode can also be located on the rear side (inner side) relative to the uncovered exposed position of the electrode along the fluid flow direction. As a result, the local electric field formed by the voltage difference increases between the portion on the front side (near side) of the electrode and the first inner flange 62, etc., generating a discharge therebetween. Through this discharge, the target particles, which are the particles to be sampled, can be charged while the target particles are oxidized by the generated ozone and other substances. On the other hand, in the covered portion on the rear side of the electrode, the electric field concentration is smaller, and therefore, no discharge occurs. However, the distance between this portion and the first electrode 22 is smaller, so the electric field between the electrodes increases, and the target particles passing between the electrodes are collected with a stronger force. Thus, by not charging the particles as necessary, the amount of dust collected can be increased while suppressing the generation of active substances such as ozone. Adjustments can be made by sliding the covering member 102, etc., allowing the covering position and length to be changed according to the dust collection environment and / or the target particles. When changes to the covering position are not required, the second electrode 24 and the third electrode 25 can also be constructed with a shape that is thinner at the front and thicker at the back (see reference). Figure 10 ).

[0070] The voltage applying unit 26 applies voltage between the first electrode 22 and the second electrode 24, and between the first electrode 22 and the third electrode 25. Specifically, the voltage applying unit 26 applies voltage between the first electrode 22 and the second electrode 24 to create an electric field between them. The voltage applying unit 26 also applies voltage between the first electrode 22 and the third electrode 25 to create an electric field between them. The voltage applying unit 26 includes a first support 70, a second support 72, a first wire 74, and a second wire 76.

[0071] The first support 70 is fixed to the first flange member 18 and located inside the first flange member 18. The first support 70 is connected to one end of the second electrode 24 in the axial direction, supporting the second electrode 24. The second support 72 is fixed to the second flange member 20 and located inside the second flange member 20. The second support 72 is connected to the other end of the third electrode 25 in the axial direction, supporting the third electrode 25. The first support 70 and the second support 72 are conductive and electrically connected to the second electrode 24 and the third electrode 25. The first wire 74 is electrically connected to the second electrode 24 and the third electrode 25 via the second support 72. The second wire 76 is electrically connected to the first electrode 22 via a gear 86, etc.

[0072] The voltage application unit 26 can supply electricity of arbitrary magnitude and waveform to the first electrode 22 and the second electrode 24 and third electrode 25 located near the center of the first electrode 22 via the first wire 74 and the second wire 76. Thus, the particle sampling device 10 performs electrostatic dust collection of particles. Furthermore, the second electrode 24 and the core member 100 can be constructed not as wires, but as plates or needles, etc., and there are no limitations on their construction or placement, as long as a non-uniform electric field can be formed. For example, the voltage application unit 26 can be implemented by a power supply circuit including a converter, etc. For example, the voltage application unit 26 applies a DC voltage of 6 kV.

[0073] For example, the voltage application unit 26 applies voltages between the first electrode 22 and the second electrode 24, and between the first electrode 22 and the third electrode 25, such that the potential on the second electrode 24 side is higher than that on the first electrode 22 side, and the potential on the third electrode 25 side is higher than that on the first electrode 22 side. Thus, within the space 69, an electric field is generated from the second electrode 24 toward the first electrode 22, and an electric field is generated from the third electrode 25 toward the first electrode 22 (see reference). Figure 3 Arrow E and Figure 4 Arrow E).

[0074] The supply unit 28 supplies liquid 68 into the first electrode 22, causing the liquid 68 to accumulate on a portion of the inner surface 66 of the first electrode 22 in the direction about the axis B. In other words, the supply unit 28 supplies liquid 68 into the first electrode 22 in order to accumulate liquid 68 on a portion of the inner surface 66 of the first electrode 22 in the direction about the axis B. Thus, the liquid 68 supplied by the supply unit 28 is accumulated on the inner surface 66 of the body 56 of the first electrode 22. The supply unit 28 has a tank 78 and an injection unit 80.

[0075] The container 78 holds liquid 68 for supplying to the first electrode 22. The liquid 68 held in the container 78 is discharged from the injection section 80 by a pump (not shown) and supplied to the body 56 of the first electrode 22. In this way, the container 78, which is provided with liquid 68 for pre-accumulating capture fluid for influenza virus sensing, supplies liquid 68 to the interior of the first electrode 22 through the injection section 80.

[0076] In this embodiment, the supply unit 28 supplies a liquid for particle analysis as liquid 68. For example, liquid for particle analysis means a liquid for analysis, a liquid that maintains the activity of the target substance contained in the particle for analysis, a liquid that identifies the target substance contained in the particle for analysis, a liquid that protects the target substance contained in the particle for analysis, or any combination thereof. Liquid 68 may also be a liquid intended for dissolution and preservation. Examples of liquids intended for dissolution and preservation include physiological saline, PBS buffer, EDTA buffer, and bicarbonate buffer. Liquid 68 may be a liquid containing a substance that specifically binds to a virus and emits magnetic and / or fluorescent properties. Furthermore, liquid 68 may not be a liquid for particle analysis; for example, it may be pure water.

[0077] Furthermore, the target substance is not limited to influenza virus. For example, the target substance can be other viruses or living organisms other than viruses (such as bacteria). The target substance may also not be a living organism; it can be environmental pollutants or allergens, etc.

[0078] The recovery unit 30 recovers a portion of the liquid 68 accumulated on the inner surface 66 of the first electrode 22 in the direction about the axis B. The recovery unit 30 includes a tank 82 and an extraction unit 84. The liquid 68 accumulated on the portion of the inner surface 66 of the first electrode 22 in the direction about the axis B is drawn from the extraction unit 84 by a pump (not shown) and held in the tank 82 for recovery. In this way, the liquid 68 containing the trapping liquid of particles is drawn by the extraction unit 84 and held in the tank 82.

[0079] The drive unit 32 rotates the first electrode 22 about a rotation axis that extends in the axial direction of the body 56 of the first electrode 22 and passes through the first electrode 22. In this embodiment, this rotation axis coincides with the axis B of the body 56. That is, in this embodiment, the drive unit 32 rotates the first electrode 22 about the axis B of the body 56 of the first electrode 22. The drive unit 32 has a gear 86 and a motor 88 for rotating the gear 86. The gear 86 has external teeth (not shown) that mesh with the external teeth (not shown) of the first electrode 22. The gear 86 is rotated by the motor 88 (see reference). Figure 4 Arrow F), thus, the first electrode 22 rotates about the axis B of the main body 56 (see arrow F). Figure 4 (arrow C). Thus, the first electrode 22 is rotated by the gear 86 driven by the motor 88.

[0080] An anemometer 34 is disposed on the inner surface of the body 48 of the first flange member 18 to measure the wind speed of the (predetermined) gas passing through the first electrode 22. Gas outside the particulate sampling device 10 passes through the inner side of the first flange member 18 and then through the inner side of the body 56 of the first electrode 22, and is released to the outside of the particulate sampling device 10 through the inner side of the second flange member 20 (see reference). Figure 2 Arrow A and Figure 3 Arrow A). The wind speed sensor 34 measures the wind speed of the gas that is to pass through the first electrode 22 (i.e., the gas that has passed through the first electrode 22 before).

[0081] Furthermore, gas outside the particulate sampling device 10 can also pass through the inside of the second flange member 20 and the inside of the body 56 of the first electrode 22, and be released from the first flange member 18 to the outside of the particulate sampling device 10. In this case, the wind speed sensor 34 can measure the wind speed of the gas passing through the inside of the first electrode 22 (i.e., the gas after passing through the first electrode 22).

[0082] The control unit 90 receives the wind speed measured by the wind speed sensor 34, and the control unit 90 can also determine that the wind speed is the wind speed of the gas inside the first electrode 22.

[0083] A gas concentration sensor 36 is disposed on the inner surface of the main body 48 of the first flange member 18, and measures the concentration of particulate matter in the gas before or after passing through the first electrode 22, as described above. For example, the gas concentration sensor 36 is an optical sensor. The control unit 90 receives the concentration of particulate matter measured by the gas concentration sensor 36, and the control unit 90 may also determine that the concentration is the concentration of particulate matter in the gas within the first electrode 22.

[0084] A liquid concentration sensor 38 is disposed in a portion of the liquid 68 stored on the inner surface 66 of the first electrode 22 in the direction about the axis B, and measures the concentration of particles in the liquid 68. For example, the liquid concentration sensor 38 is an optical sensor.

[0085] The ammeter 40 is connected to the second wire 76 and measures the first current value of the first current flowing between the first electrode 22 and the second electrode 24, the second current value of the second current flowing between the first electrode 22 and the third electrode 25, or a third current value based on the first and second currents. Furthermore, the ammeter 40 can be positioned where it can measure the first current value of the first current, the second current value of the second current, or the third current value based on the first and second currents.

[0086] Figure 5 This is a block diagram illustrating the functional configuration of the particulate sampling device 10. (Refer to...) Figure 5 The functional structure of the particulate sampling device 10 will be explained.

[0087] like Figure 5 As shown, the particulate sampling device 10 also includes a control unit 90.

[0088] The control unit 90 is electrically connected to the wind speed sensor 34, the air concentration sensor 36, the liquid concentration sensor 38, the ammeter 40, the voltage application unit 26, the supply unit 28, the recovery unit 30, and the drive unit 32. Based on the measurement results from the wind speed sensor 34, the air concentration sensor 36, the liquid concentration sensor 38, and the ammeter 40, the control unit 90 controls the voltage application unit 26, the supply unit 28, the recovery unit 30, and the drive unit 32. For example, the control unit 90 can be implemented using a microcomputer, a processor, or a dedicated circuit.

[0089] Based on the measurement results of the wind speed sensor 34, the control unit 90 calculates the flow rate of the gas passing inside the main body 56 of the first electrode 22 and outputs the flow rate. For example, the control unit 90 uses the wind speed of the gas passing inside the main body 56 of the first electrode 22 and the cross-sectional area of ​​the flow path through which the gas passes to calculate the flow rate. The control unit 90 outputs the calculated flow rate to other devices (not shown). Thus, the flow rate calculated by the control unit 90 can be used for particle analysis, etc.

[0090] Based on the measurement results of the gas concentration sensor 36, the control unit 90 controls the voltage application unit 26 and the drive unit 32. Specifically, when the concentration of particles in the gas is higher than a predetermined concentration, the control unit 90 causes the voltage application unit 26 to apply a voltage between the first electrode 22 and the second electrode 24, and also to apply a voltage between the first electrode 22 and the third electrode 25. When the concentration of particles in the gas is higher than a predetermined concentration, the control unit 90 causes the drive unit 32 to rotate the first electrode 22.

[0091] The control unit 90 controls the voltage application unit 26 based on the measurement results of the liquid concentration sensor 38. Specifically, when the concentration of particles in the accumulated liquid 68 is higher than a predetermined concentration, the control unit 90 stops the voltage application unit 26 from applying voltage between the first electrode 22 and the second electrode 24, and also stops the voltage application unit 26 from applying voltage between the first electrode 22 and the third electrode 25. Furthermore, for example, the control unit 90 may also stop the rotation of the drive unit 32 when the concentration of particles in the accumulated liquid 68 is higher than a predetermined concentration. For example, the control unit 90 may also cause the recovery unit 30 to recover the accumulated liquid 68 when the concentration of particles in the accumulated liquid 68 is higher than a predetermined concentration.

[0092] The control unit 90 controls the supply unit 28 based on the measurement results of the ammeter 40. For example, when the amount of liquid 68 stored decreases, the resistance between the first electrode 22 and the second electrode 24, and between the first electrode 22 and the third electrode 25, decreases. As a result, the current values ​​flowing between the first electrode 22 and the second electrode 24, and between the first electrode 22 and the third electrode 25, increase. Therefore, when the current value measured by the ammeter 40 is greater than a predetermined value, the control unit 90 causes the supply unit 28 to supply liquid 68 into the body 56 of the first electrode 22, replenishing the body 56 of the first electrode 22 with liquid 68. For example, if the first current value of the first current flowing between the first electrode 22 and the second electrode 24 is greater than a predetermined value, if the second current value of the second current flowing between the first electrode 22 and the third electrode 25 is greater than a predetermined value, or if the third current value based on the first current and the second current is greater than a predetermined value, the control unit 90 causes the supply unit 28 to replenish the body 56 of the first electrode 22 with liquid 68.

[0093] Next, the operation of the particulate sampling device 10 configured as described above will be explained. Figure 6 This is a flowchart illustrating an example of the operation of the particulate sampling device 10. Figure 7 This is an explanatory diagram illustrating an example of the operation of the particle sampling device 10, showing the movement of the virus inside the particle sampling device 10 until the virus is actually recovered. (See reference...) Figure 6 and Figure 7 An example of the operation of the particulate sampling device 10, which includes the capture of influenza virus 1, the liquid recovery of influenza virus 1, and the recovery of liquid 68 in this embodiment, will be described. Here, liquid capture is performed by the particulate sampling device 10 with the aim of recovering influenza virus 1, which is believed to cause airborne infection, as a liquid sample that can be analyzed by sensors or the like.

[0094] like Figure 6 As shown, firstly, the supply unit 28 supplies liquid 68 into the first electrode 22, causing a portion of the inner surface 66 of the first electrode 22 in the direction about axis B to accumulate liquid 68 (supply step) (step S1). For example, the control unit 90 receives an instruction from the user via an operation button (not shown), and the control unit 90 causes the supply unit 28 to supply liquid 68 into the body 56 of the first electrode 22. Alternatively, for example, the control unit 90 may also cause the supply unit 28 to supply liquid 68 into the body 56 of the first electrode 22 based on the measurement result of the gas concentration sensor 36.

[0095] like Figure 7 As shown, liquid 68 is supplied to the body 56 of the first electrode 22, and liquid 68 accumulates on a portion of the inner surface 66 of the body 56 of the first electrode 22 in the direction about axis B.

[0096] return Figure 6 Next, the voltage application unit 26 applies voltage between the first electrode 22 and the second electrode 24, and between the first electrode 22 and the third electrode 25 (voltage application step) (step S2). For example, based on the measurement results of the gas concentration sensor 36, the control unit 90 causes the voltage application unit 26 to apply voltage between the first electrode 22 and the second electrode 24, and between the first electrode 22 and the third electrode 25. Alternatively, for example, the control unit 90 may receive instructions from the user via an operation button (not shown), and the control unit 90 may cause the voltage application unit 26 to apply voltage between the first electrode 22 and the second electrode 24, and between the first electrode 22 and the third electrode 25.

[0097] like Figure 7 As shown, through arbitrary airflow (refer to...) Figure 7 Arrow A) indicates that the influenza virus 1 in the gas introduced into the particulate sampling device 10 is first charged to one of positive or negative due to ions 2, which are emitted by the discharge of the second electrode 24 under a high voltage. Here, the case where the influenza virus 1 is positively charged will be explained. The influenza virus 1, now in a charged state, is charged by the electric field formed between the second electrode 24 and the first electrode 22, and the electric field formed between the third electrode 25 and the first electrode 22 (see reference). Figure 7 Arrow E) moves as in trajectory 3, and is drawn towards the inner surface 66 of the first electrode 22 to collect dust. In this way, influenza virus 1 attaches to the inner surface 66 of the first electrode 22 and is captured on the inner surface 66.

[0098] return Figure 6 Next, the drive unit 32 rotates the first electrode 22 around the axis B (drive step) (step S3). For example, based on the measurement result of the gas concentration sensor 36, the control unit 90 causes the drive unit 32 to rotate the first electrode 22. Alternatively, for example, the control unit 90 may receive an instruction from the user via an operation button (not shown), and the control unit 90 may cause the drive unit 32 to rotate the first electrode 22.

[0099] like Figure 7 As shown, the first electrode 22 rotates about the axis B with liquid 68 accumulated on a portion of the inner surface 66 of the body 56 of the first electrode 22 in the direction about the axis B. In other words, the first electrode 22 rotates about the axis B with liquid 68 accumulated below the axis B so that the liquid 68 does not flow out to the outside of the body 56. As a result, the portion of the inner surface 66 of the first electrode 22 located vertically below the axis B comes into contact with the accumulated liquid 68 in sequence.

[0100] The influenza virus 1 accumulated on the inner surface 66 is recovered at any given time by the liquid 68 stored within the body 56 of the first electrode 22. Specifically, the influenza virus 1 adhering to the inner surface 66 of the body 56 of the first electrode 22 is recovered into the liquid 68 by contacting it. By moving (rotating) the first electrode 22, which is rotated using a motor 88 and a gear 86, the entire inner surface 66 of the first electrode 22 can be rinsed with the stored liquid 68.

[0101] Alternatively, before applying voltage between the first electrode 22 and the second electrode 24 and between the first electrode 22 and the third electrode 25, the first electrode 22 may be rotated about axis B, and voltage may be applied between the first electrode 22 and the second electrode 24 and between the first electrode 22 and the third electrode 25 while the first electrode 22 has been rotated about axis B.

[0102] return Figure 6Finally, the recovery unit 30 recovers the accumulated liquid 68 (recovery step) (step S4). For example, after the first electrode 22 has been rotated for a certain period of time, the liquid 68 can be recovered in the recovery unit 30 (tank 82) by the extraction unit 84 at any time interval. Thus, a liquid sample (liquid 68) containing influenza virus 1 separated from the gas can be obtained. Alternatively, for example, based on the measurement result of the liquid concentration sensor 38, the control unit 90 can cause the recovery unit 30 to recover the liquid 68 accumulated in the body 56 of the first electrode 22. For example, the control unit 90 can receive an instruction from the user via an operation button (not shown), and the control unit 90 can cause the recovery unit 30 to recover the liquid 68 accumulated in the body 56 of the first electrode 22.

[0103] When sampling particles, sampling can be performed more appropriately and efficiently by using an anemometer 34, an air concentration sensor 36, and a liquid concentration sensor 38. By combining the wind speed information obtained from the anemometer 34 with the area information at the measurement point of the anemometer 34 and the operating time information, information on the volume of air processed can be obtained. Information on the concentration of particles contained in the inhaled air can be obtained from the air concentration sensor 36. Information on the concentration of particles in the stored liquid 68 can be obtained from the liquid concentration sensor 38. By using these sensors, the duration of particle sampling by the particle sampling device 10, the timing of starting particle sampling operation, and the timing of stopping particle sampling operation can be set to conditions desired by the user. For example, "10,000 particles / cm²" can be used. 3 "The air with a particle concentration arrives and the operation begins," "Because of the 1m 3 The system can select the optimal sampling method that best suits the intended purpose, such as "the air has been treated and the operation has ended" or "the operation has ended because it has reached 1000 samples / mL".

[0104] By adding a function to simultaneously read the current when a high voltage is applied, it is possible to prevent the supply of liquid 68 from exceeding the necessary amount, and to prevent the liquid 68 from drying up. Specifically, the control unit 90 reads the current value measured by the ammeter 40, and when the current value exceeds a predetermined threshold, the supply unit 28 supplies a minimum amount of liquid 68 to the body 56 of the first electrode 22. This allows the concentration of particles in the stored liquid 68 to be maintained at a high concentration as much as possible.

[0105] As described above, the particulate sampling device 10 of this embodiment can recover influenza virus 1 from the air into liquid 68 at a high concentration. By combining information obtained from various sensors, sampling can be performed efficiently and under optimal conditions according to the user's intended use.

[0106] Furthermore, the particulate sampling device 10 can also grade and recover influenza virus-containing aerosols from the air into the liquid 68 according to two particle size ranges. This allows for the analysis of the amount of influenza virus in each particle size range.

[0107] The particulate sampling device 10 can accumulate particulates in the liquid 68 stored in the first electrode 22 without circulating the liquid 68. Therefore, it is easy to recover the particulates in the liquid 68 to achieve a high concentration. The particulate sampling device 10 does not require equipment to circulate the liquid 68, and it is a device that can be easily miniaturized and energy-efficient.

[0108] Figure 8 This is a graph showing the experimental results of experiments conducted to confirm ozone generation and dust collection efficiency with and without the covering member 102. Figure 8 The experimental results shown represent the results of dust collection experiments conducted using a first electrode 22 with an inner diameter of 15 mm, a second electrode 24 with an outer diameter of 150 μm, a core member 100, and a covering member 102 with an outer diameter of 2.6 mm, with a dust collection flow rate of 30 L / min, a target particle diameter of 1 μm, and an applied voltage of 6 kV. Furthermore, gas was allowed to flow into the first electrode 22 from one end (the end on the side of the first flange member 18). Regarding the case with the covering member 102, approximately 70% (that is, approximately 70% of I1 + I2) of the linear members constituting the second electrode 24 and the core member 100 is covered by the covering member 102.

[0109] like Figure 8 As shown, without coverage (i.e., without the covering member 102), the ozone generation is 0.66 ppm, and with approximately 70% coverage (i.e., with the covering member 102), the ozone generation is 0.19 ppm. By providing the covering member 102, the ozone generation is suppressed.

[0110] Without a cover, i.e., without the cover member 102, the dust collection efficiency is approximately 85%, and with approximately 70% coverage, i.e., with the cover member 102, the dust collection efficiency is approximately 90%. For example, dust collection efficiency is the ratio of the number of target particles captured in the liquid 68 to the number of target particles in the gas flowing into the first electrode 22. By providing the cover member 102, the dust collection efficiency is improved.

[0111] Furthermore, the thicker the covering member 102, the smaller the gap between the covering member 102 and the first electrode 22, and the higher the electric field strength between the covering member 102 and the first electrode 22, thus improving the collection efficiency.

[0112] As described above, the particle sampling device 10 according to this embodiment is a particle sampling device comprising: a first electrode 22, which is cylindrical and has a first opening at a first end in the axial direction of the cylinder and a second opening at a second end in the axial direction of the cylinder; a second electrode 24, which extends in the axial direction and is disposed within the first electrode 22 at a distance from the inner surface 66 of the first electrode 22; and a third electrode 25, which extends in the axial direction and is disposed within the first electrode 22 at a distance from the inner surface 66, wherein the third electrode 25 is thicker than the second electrode 24, and in the axial direction, the third electrode 25 is thicker than the second electrode 24. The positions of electrode 25 and the second electrode 24 are different; the supply unit 28 supplies liquid 68 into the first electrode 22, so that the liquid 68 accumulates in a portion of the inner surface 66 of the first electrode 22 in the direction about the axis B; the voltage application unit 26 applies a first voltage between the first electrode 22 and the second electrode 24, and applies a second voltage between the first electrode 22 and the third electrode 25; the drive unit 32 rotates the first electrode 22 about a rotation axis that extends in the axial direction and passes through the first electrode 22; and the recovery unit 30 recovers the accumulated liquid 68.

[0113] Therefore, since the third electrode 25 is thicker than the second electrode 24, it is more difficult to concentrate the electric field between the third electrode 25 and the first electrode 22 than between the second electrode 24 and the first electrode 22, making discharge less likely. Thus, the generation of active substances such as ozone between the third electrode 25 and the first electrode 22 can be suppressed. Because the third electrode 25 is thicker than the second electrode 24, the electric field strength between the third electrode 25 and the first electrode 22 becomes higher than that between the second electrode 24 and the first electrode 22. Therefore, when gas flows into the first electrode 22 from the end closest to the second electrode 24, the particles in the gas can be easily charged first through the discharge between the second electrode 24 and the first electrode 22. Furthermore, after the particles in the gas are charged, the charged particles can easily adhere to the inner surface 66 of the first electrode 22 through the electric field between the third electrode 25 and the first electrode 22. In this way, by making the third electrode 25 thicker than the second electrode 24, and by arranging the second electrode 24 and the third electrode 25 at different positions along the axial direction of the first electrode 22, it is possible to efficiently sample particles while suppressing the generation of active substances. Furthermore, the first voltage and the second voltage can be the same potential or different potentials.

[0114] In the particle sampling device 10 of this embodiment, the third electrode 25 is arranged with the second electrode 24 in the axial direction.

[0115] Therefore, it is possible to suppress the particle sampling device 10 from increasing in size in a direction orthogonal to the axis of the first electrode 22, and to sample particles efficiently while suppressing the generation of active substances.

[0116] In the particulate sampling device 10 of this embodiment, the third electrode 25 is longer than the second electrode 24 within the first electrode 22.

[0117] As a result, the region where discharge is difficult and the electric field intensity is high becomes longer than the region where discharge is easy. Therefore, it is possible to further suppress the generation of active substances while sampling particles more efficiently.

[0118] In the particle sampling device 10 of this embodiment, the second electrode 24 is disposed between the first opening and the first surface within the first electrode 22, but not between the first surface and the second opening. The third electrode 25 is disposed between the first surface and the second opening within the first electrode 22, but not between the first opening and the first surface. The second electrode 24 and the third electrode 25 are in direct contact on the first surface. The distance between the first surface and the first opening is smaller than the distance between the first surface and the second opening. The first surface is perpendicular to the axial direction.

[0119] Therefore, the second electrode 24 is positioned at one end closer to the center G, thus preventing the second electrode 24 from becoming too long and further suppressing the generation of active substances. The third electrode 25 extends from one end closer to the center G to a position opposite to the other end, thus allowing the third electrode 25 to be longer than the second electrode 24 at the other end, enabling more efficient sampling of particles.

[0120] In the particulate sampling device 10 of this embodiment, at least a portion of the third electrode 25 is integrally formed with the second electrode 24.

[0121] Therefore, at least a portion of the third electrode 25 and the second electrode 24 can be easily formed using a single component.

[0122] In the particle sampling device 10 of this embodiment, the third electrode 25 has a core member 100 extending in the axial direction and a cover member 102 that is conductive and covers the core member 100.

[0123] Therefore, by covering the core member 100 with the covering member 102, the third electrode 25 can be easily made to be grouped with the second electrode 24.

[0124] In the particle sampling apparatus 10 of this embodiment, the core member 100 is integrally formed with the second electrode 24 such that the second electrode 24 and the core member 100 are continuous in the axial direction.

[0125] Therefore, the core member 100 and the second electrode 24 can be easily formed using a single conductive member, and the third electrode 25 can be easily made thicker than the second electrode 24 using the covering member 102.

[0126] The particulate sampling device 10 according to this embodiment also includes a wind speed sensor 34, and the control unit 90 determines that the measured value of the wind speed sensor 34 represents the wind speed of the gas in the first electrode 22.

[0127] Therefore, the wind speed of the gas passing through the first electrode 22 can be measured, making it easy to determine whether gas is flowing within the first electrode 22. For example, when gas is flowing within the first electrode 22, applying voltage can easily capture particles, thus enabling more efficient particle sampling. Based on the wind speed information from the wind speed sensor 34, the timing of applying voltage between the first and second electrodes 24 and between the first and third electrodes 25, the timing of ending voltage application, and the timing of starting liquid recovery 68 can be adjusted. This allows for easy and optimal timing and operating time sampling based on the intended use and purpose of the sampling.

[0128] The particulate sampling device 10 according to this embodiment also includes a control unit 90, which calculates the gas flow rate based on the measurement results of the wind speed sensor 34 and outputs the flow rate.

[0129] Therefore, the timing of the end of voltage application and the timing of the start of liquid recovery 68 can be adjusted based on the flow rate of the gas passing through the first electrode 22, enabling more efficient sampling of particles.

[0130] The particulate sampling device 10 according to this embodiment also includes a gas concentration sensor 36. The control unit 90 determines that the measured value of the gas concentration sensor 36 represents the concentration of particulates in the gas within the first electrode 22. Based on the measurement result of the gas concentration sensor 36, the control unit 90 controls the voltage application unit 26 and the drive unit 32.

[0131] Therefore, when a concentration higher than the predetermined concentration is detected, applying a voltage causes the first electrode 22 to rotate, thereby easily capturing particles in the gas. In this way, by operating the system with a gas containing the desired particle concentration, particle sampling can be performed more efficiently.

[0132] The particulate sampling device 10 according to this embodiment also includes a liquid concentration sensor 38 for measuring the concentration of particulates in the stored liquid 68. When the concentration measured by the liquid concentration sensor 38 is higher than the predetermined concentration, the control unit 90 stops the application of voltage by the voltage application unit 26.

[0133] Therefore, when particles accumulate in liquid 68 or the concentration of particles in liquid 68 becomes higher than the predetermined concentration, the application of voltage is stopped, and sampling ends. This avoids unnecessarily long sampling times and situations where the concentration of particles in liquid 68 is too low to analyze, allowing for more efficient particle sampling.

[0134] The particulate sampling apparatus 10 according to this embodiment also includes an ammeter 40 that measures the value of a first current flowing between the first electrode 22 and the second electrode 24, the value of a second current flowing between the first electrode 22 and the third electrode 25, or the value of a third current based on the first current and the second current. When the current value measured by the ammeter 40 is greater than a predetermined value, the control unit 90 causes the supply unit 28 to replenish the first electrode 22 with liquid 68.

[0135] Therefore, the value of the first current flowing between the first electrode 22 and the second electrode 24, the value of the second current flowing between the first electrode 22 and the third electrode 25, or the value of a third current based on the first and second currents can be measured. If the measured current value is greater than a predetermined value, liquid 68 is replenished into the first electrode 22 through the supply unit 28. For example, when the volume of liquid 68 decreases over time and the current value becomes greater than a predetermined value, a predetermined amount of liquid 68 can be replenished. Therefore, the decrease in particle concentration caused by the necessary increase in the volume of liquid 68 stored in the first electrode 22 can be suppressed, and the depletion of liquid 68 can be prevented. Therefore, particle sampling can be performed more efficiently.

[0136] In the particulate sampling device 10 of this embodiment, the inner surface 66 of the first electrode 22 is subjected to hydrophilic treatment.

[0137] Therefore, the particles attached to the inner surface 66 can easily leave the inner surface 66 upon contact with the accumulated liquid 68. Thus, loss during the recovery of particles collected on the inner surface 66 can be suppressed, and particle sampling can be performed more efficiently.

[0138] In the particulate sampling device 10 of this embodiment, an adhesion suppression member for suppressing the adhesion of particulates is attached to the inner surface 66 of the first electrode 22.

[0139] Therefore, the particles attached to the inner surface 66 can easily leave the inner surface 66 upon contact with the accumulated liquid 68. Thus, loss during the recovery of particles collected on the inner surface 66 can be suppressed, and particle sampling can be performed more efficiently.

[0140] In the particulate sampling device 10 of this embodiment, liquid 68 is a liquid used for the analysis of particulates in the liquid.

[0141] Therefore, it is possible to easily extract the target substances contained in the particles. By selecting an appropriate liquid 68 according to the purpose and / or use, it is possible to implement an appropriate detection protocol and / or prevent damage to the sampling.

[0142] (Second Implementation)

[0143] Figure 9 This is a cross-sectional view of the particulate sampling device 10a according to the second embodiment. (Refer to...) Figure 9 The particulate sampling device 10a according to the second embodiment will be described.

[0144] like Figure 9 As shown, the particle sampling device 10a includes a second electrode 24a and a third electrode 25a. The particle sampling device 10a differs from the particle sampling device 10 mainly in that the third electrode 25a and the second electrode 24a are separate.

[0145] The third electrode 25a has a core member 100a extending in the axial direction of the first electrode 22 and a conductive covering member 102a covering the core member 100a. The core member 100a and the covering member 102a are separate from the second electrode 24a. The third electrode 25a is arranged at an open distance from the second electrode 24a in the axial direction of the first electrode 22. The first wire 74 can also be electrically connected to the second electrode 24a via the first support 70 (not shown).

[0146] For example, when the second electrode 24a and the third electrode 25a are separated, the ammeter 40 is installed at a position that can measure the current value of the current flowing between the first electrode 22 and the second electrode 24a, and measures the current value of the current flowing between the first electrode 22 and the second electrode 24a.

[0147] Furthermore, for example, the third electrode 25a may also be in contact with the second electrode 24a. For example, the third electrode 25a may also be arranged in a position that is not aligned with the second electrode 24a in the axial direction of the first electrode 22. That is, for example, when viewed from the axial direction of the first electrode 22, the third electrode 25a may also be arranged in a position that does not overlap with the second electrode 24a.

[0148] (Third Implementation)

[0149] Figure 10 This is a cross-sectional view of the particulate sampling device 10b according to the third embodiment. (Refer to...) Figure 10 The particulate sampling device 10b according to the third embodiment will be described.

[0150] like Figure 10 As shown, the particle sampling device 10b includes a second electrode 24b and a third electrode 25b. The particle sampling device 10b differs from the particle sampling device 10 mainly in that the third electrode 25b does not have a covering member 102 and the third electrode 25b is composed of a conductive member that is thicker than the second electrode 24b.

[0151] The third electrode 25b is integrally formed with the second electrode 24b. For example, by thinning one end of the rod-shaped conductive member, the second electrode 24b and the third electrode 25b can be integrally formed with a single conductive member.

[0152] Furthermore, for example, the third electrode 25b can be separate from the second electrode 24b, or it can be configured with an open gap between it and the second electrode 24b.

[0153] (Other implementation methods, etc.)

[0154] In the above embodiments, the case where the third electrode 25 is longer than the second electrode 24 within the first electrode 22 has been described, but this is not a limitation. For example, the third electrode may also be shorter than the second electrode within the first electrode.

[0155] In the above embodiments, the second electrode 24 is described in either a position closer to the center G of the first electrode 22 in the axial direction than the center G of the first electrode 22, or a position closer to the other end of the first electrode 22 than the center G of the first electrode 22, but this is not a limitation. For example, the second electrode may be positioned from a position closer to the center of the first electrode in the axial direction than the center of the first electrode to a position closer to the other end of the first electrode than the center of the first electrode.

[0156] In the above embodiment, the third electrode 25 is described as extending from a position near one end of the first electrode 22, which is closer to the center G in the axial direction than the first electrode 22, to a position opposite to the other end of the first electrode 22, but this is not a limitation. For example, the third electrode may also be positioned within the first electrode, near the other end of the first electrode, which is closer to the center in the axial direction than the first electrode.

[0157] In the above embodiments, the case where the core member 100 has a thickness approximately the same as the second electrode 24 has been described, but this is not a limitation. For example, the core member may be thicker or thinner than the second electrode. For example, if the core member is thinner than the second electrode, the third electrode may be thicker than the second electrode by covering the core member with a covering member.

[0158] The above-described embodiment describes the particulate sampling device 10 as having a second electrode 24 and a third electrode 25, but is not limited thereto. For example, the particulate sampling device may also have multiple second electrodes and multiple third electrodes. In this case, for example, the second and third electrodes may be arranged alternately in the axial direction of the first electrode.

[0159] In the above embodiments, the case where the main body 56 of the first electrode 22 is cylindrical has been described, but it is not limited to this. For example, the main body of the first electrode may also be an elliptical cylinder or a polygonal cylinder, etc.

[0160] In the above embodiment, the case where the first electrode 22 is arranged with the axis B of the main body 56 parallel to the horizontal direction has been described. However, this is not a limitation. The first electrode 22 may not be arranged with the axis B of the main body 56 parallel to the horizontal direction. For example, the first electrode 22 may be arranged with the axis B of the main body 56 inclined relative to the horizontal direction, as long as liquid 68 can be accumulated on a portion of the inner surface 66 of the main body 56 in the direction around the axis B so that the liquid 68 does not flow out to the outside of the main body 56. In other words, the first electrode 22 may be configured in a way that allows liquid 68 to be accumulated on the inner surface 66.

[0161] In the above embodiments, the case where the second electrode 24 is set in an orientation where the axis of the second electrode 24 coincides with the axis B of the main body 56 of the first electrode 22 has been described, but this is not a limitation. The second electrode 24 may also be set in an orientation where its axis does not coincide with the axis B of the main body 56 of the first electrode 22. For example, the second electrode 24 may be set in an orientation where its axis is inclined relative to the axis B of the main body 56, and it may extend at least in the axial direction of the main body 56 of the first electrode 22. For example, the second electrode 24 may also be set in an orientation where its axis does not coincide with the axis B of the main body 56 of the first electrode 22, and its axis is parallel to the axis B of the main body 56 of the first electrode 22.

[0162] In the above embodiments, the case where the third electrode 25 is set in an orientation where its axis coincides with the axis B of the main body 56 of the first electrode 22 has been described, but this is not a limitation. The third electrode 25 may not be set in an orientation where its axis coincides with the axis B of the main body 56 of the first electrode 22. For example, the third electrode 25 may be set in an orientation where its axis is inclined relative to the axis B of the main body 56, and it may extend at least in the axial direction of the main body 56 of the first electrode 22. For example, the third electrode 25 may also be set in an orientation where its axis does not coincide with the axis B of the main body 56 of the first electrode 22, and its axis is parallel to the axis B of the main body 56 of the first electrode 22.

[0163] In the above embodiments, the case where the second electrode 24 is linear has been described, but it is not limited to this. For example, the second electrode may also be plate-shaped or needle-shaped.

[0164] In the above embodiments, the case where the core member 100 is linear has been described, but it is not limited to this. For example, the core member may also be plate-shaped or needle-shaped.

[0165] In the above embodiment, the case where the second electrode 24 protrudes further outward than one end of the main body 56 has been described, but this is not a limitation. For example, the second electrode may not protrude further outward than the first electrode.

[0166] In the above embodiment, the case where the third electrode 25 protrudes further outward than the other end of the main body 56 has been described, but it is not limited to this. For example, the third electrode may not protrude further outward than the first electrode.

[0167] In the above embodiment, the driving unit 32 was described as rotating the first electrode 22 about the axis B of the body 56 of the first electrode 22, but it is not limited to this. For example, the driving unit may also rotate the first electrode about a rotation axis that is slightly inclined relative to the axis of the body of the first electrode. The driving unit may also rotate the first electrode about a rotation axis that is parallel to the axis of the body of the first electrode. The driving unit may simply rotate the first electrode about a rotation axis that extends in the axial direction of the first electrode and passes through the first electrode.

[0168] Industrial availability

[0169] This disclosure is applicable to a device for sampling aerosols and other particles from gases such as air.

[0170] Label Explanation

[0171] 10, 10a, 10b particulate sampling devices

[0172] 12 Piping

[0173] 14. Bearing Seal of Bearing No. 1

[0174] 16. Second bearing seal

[0175] 18 First flange member

[0176] 20 Second flange member

[0177] 22 Electrode 1

[0178] 24, 24a, 24b, second electrode

[0179] 25, 25a, 25b, third electrode

[0180] 26 Voltage application section

[0181] 28 Supply Department

[0182] 30 Recycling Department

[0183] 32 Drive Unit

[0184] 34 wind speed sensors

[0185] 36. Atmospheric Concentration Sensor

[0186] 38 Liquid Concentration Sensor

[0187] 40 Ammeter

[0188] 42, 48, 52, 56 (main body)

[0189] 44 First Support

[0190] 46 Second Support

[0191] 50, 54 flanges

[0192] 58 First outer flange portion

[0193] 60 Second outer flange portion

[0194] 62 First inner flange portion

[0195] 64 Second inner flange

[0196] 66 Inner Surface

[0197] 68 Liquid

[0198] 69 Space

[0199] 70 First Support

[0200] 72 Second Support

[0201] 74 First Wire

[0202] 76. Second wire

[0203] 78 cans

[0204] 80 injection section

[0205] 82 cans

[0206] 84 Extraction Section

[0207] 86 Gears

[0208] 88 motor

[0209] 90 Control Department

[0210] 100, 100a core components

[0211] 102, 102a Covering Components

Claims

1. A particulate sampling device, comprising: The first electrode is cylindrical and has a first opening at a first end in the axial direction of the cylinder and a second opening at a second end in the axial direction of the cylinder. The second electrode extends in the axial direction and is disposed within the first electrode at a distance from the inner surface of the first electrode. A third electrode extends in the axial direction and is disposed within the first electrode at a distance from the inner surface. The third electrode is thicker than the second electrode, and the positions of the third electrode and the second electrode are different in the axial direction. A supply unit supplies liquid to the first electrode, causing the liquid to accumulate on a portion of the inner surface of the first electrode in the direction about its axis. A voltage applying unit applies a first voltage between the first electrode and the second electrode, and applies a second voltage between the first electrode and the third electrode; A drive unit that rotates the first electrode about a rotation axis extending in the axial direction and passing through the first electrode; and The recovery unit recovers the accumulated liquid.

2. The particulate sampling device according to claim 1, The third electrode is arranged in the same configuration as the second electrode in the axial direction.

3. The particulate sampling device according to claim 1, Within the first electrode, the third electrode is longer than the second electrode.

4. The particulate sampling device according to claim 3, Within the first electrode, the second electrode is disposed between the first opening and the first surface, but not between the first surface and the second opening. Within the first electrode, the third electrode is not disposed between the first opening and the first surface, but rather between the first surface and the second opening. The second electrode and the third electrode are in direct contact on the first surface. The distance between the first surface and the first opening is smaller than the distance between the first surface and the second opening. The first surface is perpendicular to the axial direction.

5. The particulate sampling device according to any one of claims 1 to 4, At least a portion of the third electrode is integrally formed with the second electrode.

6. The particulate sampling device according to any one of claims 1 to 4, The third electrode has a core member extending in the axial direction and a cover member that is conductive and covers the core member.

7. The particulate sampling device according to claim 6, The core component is integrally formed with the second electrode such that the second electrode and the core component are continuous in the axial direction.

8. The particulate sampling device according to any one of claims 1 to 4, 7, It also has a wind speed sensor. The control unit determines that the measured value of the wind speed sensor represents the wind speed of the gas inside the first electrode.

9. The particulate sampling device according to claim 8, It also includes a control unit that calculates the gas flow rate based on the measurement results of the wind speed sensor and outputs the flow rate.

10. The particulate sampling device according to claim 9, It also includes a gas concentration sensor, and the control unit determines that the measured value of the gas concentration sensor represents the concentration of particulate matter in the gas within the first electrode. The control unit controls the voltage application unit and the drive unit based on the measurement results of the gas concentration sensor.

11. The particulate sampling device according to claim 9, It also includes a liquid concentration sensor for measuring the concentration of particles in the accumulated liquid. If the concentration measured by the concentration sensor in the liquid is higher than the predetermined concentration, the control unit stops the application of voltage by the voltage application unit.

12. The particulate sampling device according to any one of claims 9 to 11, It also includes a galvanometer for measuring the value of a first current flowing between the first electrode and the second electrode, the value of a second current flowing between the first electrode and the third electrode, or the value of a third current based on the first current and the second current. If the current value measured by the ammeter is greater than a predetermined value, the control unit causes the liquid to be replenished into the first electrode through the supply unit.

13. The particulate sampling device according to any one of claims 1 to 4, 7, 9 to 11, The inner surface of the first electrode was subjected to a hydrophilic treatment.

14. The particulate sampling device according to any one of claims 1 to 4, 7, 9 to 11, An adhesion inhibition member is attached to the inner surface of the first electrode to inhibit the adhesion of microparticles.

15. The particulate sampling device according to any one of claims 1 to 4, 7, 9 to 11, The liquid is a liquid used for the analysis of particles in the liquid.

16. A particulate sampling method, which is a particulate sampling method for a particulate sampling device. The particulate sampling device includes: The first electrode is cylindrical and has a first opening at a first end in the axial direction of the cylinder and a second opening at a second end in the axial direction of the cylinder. A second electrode, extending in the axial direction, is disposed within the first electrode, spaced apart from the inner surface of the first electrode; and A third electrode, extending in the axial direction, is disposed within the first electrode at a distance from the inner surface. The third electrode is thicker than the second electrode, and the position of the third electrode is different from that of the second electrode in the axial direction. The particle sampling method includes: Liquid is supplied to the first electrode, so that the liquid accumulates on a portion of the inner surface of the first electrode in the direction about its axis; A first voltage is applied between the first electrode and the second electrode, and a second voltage is applied between the first electrode and the third electrode; Rotate the first electrode about a rotation axis that extends in the axial direction and passes through the first electrode; and The accumulated liquid is recovered.

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