Dust collection device and ventilation system

Abstract

To provide a dust collection device capable of improving dust collection efficiency.SOLUTION: A dust collection device 1 includes: discharge electrodes 20 to which a voltage is applied; counter electrodes 30 which are disposed so as to face the discharge electrodes 20, respectively, to each generate corona discharge between the discharge electrodes 20 and the counter electrode; and a rectangular-parallelepiped housing 10 which accommodates the discharge electrodes 20 and the counter electrodes 30. The housing 10 includes: a first wall surface 11a formed with a first opening 13 for allowing air to flow in; and a second wall surface 12a facing the first wall surface 11a and formed with a second opening 14 for discharging the air that has flowed in from the first opening 13. At a position of facing the first opening 13 in the second wall surface 12a, there is provided a blocking portion 15 that prevents the air that has flowed in from the first opening 13, from traveling straight.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a dust collector that uses electrostatic dust collection and a ventilation system that includes the dust collector. [Background technology]

[0002] Dust collectors are widely used to keep the air inside buildings clean. One type of dust collector known in the art is one that removes dust in the air by utilizing electrostatic force (see, for example, Patent Document 1). The conventional dust collector described in Patent Document 1 includes a charging unit that charges dust in the air by corona discharge, and a dust collecting unit that attaches the charged dust to a dust collecting plate by Coulomb force. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-171232 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional dust collector described in Patent Document 1 has an air inlet and an outlet facing each other, and the air flow is perpendicular to the direction in which the electrodes extend, so the air passes through the electrode area where Coulomb force acts in the shortest time possible, resulting in low dust collection efficiency.

[0005] The present disclosure has been made to solve such problems, and has an object to provide a dust collecting device that can improve dust collection efficiency. [Means for solving the problem]

[0006] A dust collecting device according to the present disclosure includes a discharge electrode to which a voltage is applied, a counter electrode disposed opposite the discharge electrode and generating a corona discharge between the discharge electrode and the counter electrode, and a rectangular parallelepiped housing that houses the discharge electrode and the counter electrode; The housing has a first wall surface in which a first opening is formed to allow air to flow in, and a second wall surface facing the first wall surface in which a second opening is formed to exhaust the air that has flowed in from the first opening, and at a position on the second wall surface facing the first opening, there is a blocking portion that prevents the air that has flowed in from the first opening from traveling in a straight line. [Effects of the Invention]

[0007] The dust collecting device according to the present disclosure has an effect of improving the dust collection efficiency. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a dust collecting device according to a first embodiment. [Figure 2] 1 is a perspective view showing a state in which a first frame is removed in a dust collecting device according to a first embodiment. FIG. [Figure 3] 1 is an exploded perspective view showing a dust collecting device according to a first embodiment. [Figure 4] 3 is a cross-sectional view schematically showing the flow of air in the dust collecting device according to the first embodiment. FIG. [Figure 5] FIG. 10 is a perspective view showing a conventional dust collecting device according to a comparative example. [Figure 6] FIG. 10 is an exploded perspective view showing a conventional dust collecting device according to a comparative example. [Figure 7] FIG. 10 is a cross-sectional view schematically showing the flow of air in a conventional dust collecting device according to a comparative example. [Figure 8] FIG. 10 is a perspective view showing a dust collecting device according to a second embodiment. [Figure 9] 10 is a cross-sectional view schematically showing the flow of air in a dust collecting device according to a second embodiment. FIG. [Figure 10] FIG. 10 is a perspective view showing a dust collecting device according to a third embodiment. [Figure 11]FIG. 10 is a diagram illustrating a configuration example of a ventilation system according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same functions are designated by the same reference numerals, and redundant description will be omitted. Furthermore, in the drawings, diagrams showing the configuration of an apparatus are merely diagrams showing the schematic configuration of the apparatus. The relative sizes and relative positions of the components shown in the drawings do not necessarily accurately represent the size and positional relationships between the actual components.

[0010] Embodiment 1 Fig. 1 is a perspective view showing a dust collecting device 1 according to embodiment 1. Fig. 2 is a perspective view showing a state in which a first frame 11 is removed from the dust collecting device 1 according to embodiment 1. Fig. 3 is an exploded perspective view showing the dust collecting device 1 according to embodiment 1. As shown in Figures 1 to 3, the dust collecting device 1 includes a housing 10, a plurality of discharge electrodes 20 installed in the housing 10, a plurality of counter electrodes 30 installed in the housing 10, a first support member 40 that supports one ends of the plurality of discharge electrodes 20 and the plurality of counter electrodes 30, and a second support member 41 that supports the other ends of the plurality of discharge electrodes 20 and the plurality of counter electrodes 30.

[0011] The housing 10 is composed of a first frame 11 in the shape of a rectangular parallelepiped with one open side, and a second frame 12 also in the shape of a rectangular parallelepiped with one open side. The first frame 11 and the second frame 12 are made of an insulator, and insulate the discharge electrode 20 and the counter electrode 30 installed inside from other external components.

[0012] The first frame 11 has a rectangular first wall surface 11a that forms the bottom surface, and peripheral surfaces 11b, 11c, 11d, and 11e that extend perpendicularly from four end sides of the first wall surface 11a. The surface of the first frame 11 that faces the first wall surface 11a is an open surface. Similarly, the second frame 12 has a rectangular second wall surface 12a that forms the bottom surface, and peripheral surfaces 12b, 12c, 12d, and 12e that extend perpendicularly from four end sides of the second wall surface 12a. The surface of the second frame 12 that faces the second wall surface 12a is an open surface.

[0013] The first wall surface 11a of the first frame 11 is formed slightly larger than the second wall surface 12a of the second frame 12. Therefore, by inserting the second frame 12 into the first frame 11 so that the open surfaces of both frames face each other, the first frame 11 and the second frame 12 are fitted together so that the four peripheral surfaces 11b, 11c, 11d, and 11e of the first frame 11 cover the four peripheral surfaces 12b, 12c, 12d, and 12e of the second frame 12, thereby forming a box-shaped housing 10 having a substantially rectangular parallelepiped shape.

[0014] In this embodiment, the direction in which first wall surface 11a and second wall surface 12a face each other corresponds to the Z-axis direction. Of first wall surface 11a and second wall surface 12a, the side on which first wall surface 11a is located is the positive side of the Z-axis. Among the directions perpendicular to the Z-axis direction, the longitudinal direction of first wall surface 11a corresponds to the X-axis direction. Furthermore, the directions perpendicular to both the Z-axis direction and the X-axis direction correspond to the Y-axis direction.

[0015] A rectangular first opening 13 is formed in the first wall surface 11a of the first frame 11. The first opening 13 has a length that is approximately 1 / 3 of the length of the housing 10 in the X-axis direction. The first opening 13 is disposed on the first wall surface 11a, closer to one end in the X-axis direction. Similarly, a rectangular second opening 14 is formed in the second wall surface 12a of the second frame 12. The second opening 14 has a length that is approximately 1 / 3 of the length of the housing 10 in the X-axis direction. The second opening 14 is disposed on the second wall surface 12a, closer to the other end in the X-axis direction. That is, the direction in which first opening 13 is moved and the direction in which second opening 14 is moved are opposite directions, and first opening 13 and second opening 14 are arranged to be shifted in the X-axis direction. In the following description, the side to which the first opening 13 is positioned is the positive side of the X axis, and the side to which the second opening 14 is positioned is the negative side of the X axis.

[0016] By configuring it in this manner, in the housing 10 formed by fitting the first frame 11 and the second frame 12 together, a first opening 13 and a second opening 14 are formed on the opposing surfaces, the first wall surface 11a and the second wall surface 12a, respectively. By arranging the first wall surface 11a of the first frame 11 facing upstream (the positive side of the Z axis) and the second wall surface 12a of the second frame 12 facing downstream (the negative side of the Z axis), the first opening 13 functions as an air intake port and the second opening 14 functions as an exhaust port in the dust collecting device 1. That is, upstream air containing dust flows into the housing 10 through the first opening 13, and the air from which the dust has been removed inside the housing 10 is discharged downstream through the second opening 14.

[0017] Additionally, second wall surface 12a has a blocking portion 15 at a position facing first opening 13, which blocks air that flows in from first opening 13 from traveling in a straight line. Similarly, first wall surface 11a has a blocking portion 16 at a position facing second opening 14, which blocks air that flows in from first opening 13 and flows inside housing 10 from flowing out from anywhere other than second opening 14. Blocking portion 16 is also referred to as a "second blocking portion."

[0018] The discharge electrodes 20 have an elongated, flat plate shape. The discharge electrodes 20 are needle-shaped discharge electrodes formed with a plurality of needle-shaped protrusions 21 aligned in the longitudinal direction (X-axis direction). A first discharge electrode connecting terminal 22 that electrically connects the plurality of discharge electrodes 20 is provided on one end side (the positive side of the X-axis) of the plurality of discharge electrodes 20. Furthermore, a second discharge electrode connecting terminal 23 that electrically connects the plurality of discharge electrodes 20 is provided on the other end side (the negative side of the X-axis) of the plurality of discharge electrodes 20. The first discharge electrode connecting terminal 22 and the second discharge electrode connecting terminal 23 connect the plurality of discharge electrodes 20 at intervals so that their flat plate portions face each other.

[0019] The counter electrodes 30 have an elongated, flat plate shape. A first counter electrode connecting terminal 31 that electrically connects the plurality of counter electrodes 30 is provided on one end side (the positive side of the X-axis) of each of the plurality of counter electrodes 30. A second counter electrode connecting terminal 32 that electrically connects the plurality of counter electrodes 30 is provided on the other end side (the negative side of the X-axis) of each of the plurality of counter electrodes 30. The first counter electrode connecting terminal 31 and the second counter electrode connecting terminal 32 connect the plurality of counter electrodes 30 with a gap between them so that their flat plate portions face each other.

[0020] The first support member 40 supports one ends of the plurality of discharge electrodes 20 and one ends of the plurality of counter electrodes 30 with a gap therebetween. The second support member 41 supports the other ends of the plurality of discharge electrodes 20 and the other ends of the plurality of counter electrodes 30 with a gap therebetween. The first support member 40 and the second support member 41 determine the relative positional relationship between the plurality of discharge electrodes 20 and the plurality of counter electrodes 30. The first support member 40 and the second support member 41 are made of an insulator and support the discharge electrodes 20 and the counter electrodes 30 while insulating them from each other.

[0021] Dust collecting device 1 further includes a power supply (not shown) that supplies electric power, a blower (not shown) that sends dust-containing air into housing 10 through first opening 13, and a control circuit (not shown) that controls the output of the power supply and blower. The power supply, blower, and control circuit are similar to those included in a typical dust collecting device. The power supply, the blower, and the control circuit may be provided as separate components from the dust collecting device 1.

[0022] Next, the operation of the dust collecting device 1 according to the first embodiment will be described. When the control circuit controls the power supply to apply a voltage to each discharge electrode 20, a potential difference of ±several kV to ±tens of kV occurs between each discharge electrode 20 and the counter electrode 30 adjacent to this discharge electrode 20. This causes a corona discharge to occur between the adjacent discharge electrode 20 and counter electrode 30 (more specifically, between each of the multiple protrusions 21 of the discharge electrode 20 and the counter electrode 30 adjacent to this discharge electrode 20).

[0023] In this state, when air containing dust passes between the discharge electrode 20 and the counter electrode 30, ions emitted by the corona discharge collide with the dust, causing the dust to become electrically charged. The charged dust is attracted to and adsorbed by the counter electrode 30. In other words, the counter electrode 30 functions as a dust collecting plate. In this way, the dust collector 1 removes dust from the air.

[0024] As described above, the first opening 13 and the second opening 14 are arranged offset in the X-axis direction. Therefore, air containing dust flows inside the housing 10 through a flow path as shown in FIG. 4. Hereinafter, the air flow inside the housing 10 will be described with reference to FIG. 4. Here, FIG. 4 is a diagram showing a cross-sectional structure of the central part of the housing 10 in the Y-axis direction cut along the XZ plane in a state in which the first frame 11 and the second frame 12 are combined. Note that, for ease of viewing, the discharge electrode 20, the counter electrode 30, the first support member 40, and the second support member 41 of the dust collecting device 1 are not shown.

[0025] As shown in FIG. 4, dust-laden air A1 flows into the housing 10 through the first opening 13. Because a blocking portion 15 is provided on the second wall surface 12a facing the first opening 13, the air A1 that flows into the housing 10 cannot travel in a straight line and instead travels toward the other end (the end in the negative direction of the X-axis) inside the housing 10. Because the discharge electrode 20 and the counter electrode 30 extend parallel to each other along the X-axis inside the housing 10, the air A1 traveling inside the housing 10 passes between the discharge electrode 20 and the counter electrode 30 over time, and much of the dust becomes charged by corona discharge. As a result, much of the dust is attracted to the counter electrode 30, and the air A1 from which the dust has been sufficiently removed reaches the other end (the end in the negative direction of the X-axis) inside the housing 10.

[0026] Here, a blocking portion 16 is provided on the first wall surface 11a facing the second opening 14. Therefore, the blocking portion 16 prevents the air A1 that has reached the other end inside the housing 10 from flowing out from anywhere other than the second opening 14. As a result, all of the air A1 that has reached the other end inside the housing 10 is discharged from the second opening 14.

[0027] As described above, the dust collecting device 1 according to the first embodiment has the blocking portion 15 on the second wall surface 12a facing the first opening 13. Therefore, the blocking portion 15 prevents the air A1 that flows into the housing 10 from moving straight ahead, and the air A1 changes direction at the blocking portion 15 and moves inside the housing 10 toward the other end (the end in the negative direction of the X axis). That is, the flow of the air A1 has components in the X-axis direction and the Y-axis direction. The air A1 moving inside the housing 10 passes between the discharge electrode 20 and the counter electrode 30 over time, and dust contained in the air A1 is sufficiently removed during this time. As a result, the dust collecting efficiency of the dust collecting device 1 according to the first embodiment is improved.

[0028] Furthermore, the dust collecting device 1 according to the first embodiment has a blocking portion 16 on the first wall surface 11a facing the second opening 14. Therefore, all of the air A1 that reaches the other end of the housing 10 is discharged from the second opening 14. In this way, there is no loss (for example, backflow to the upstream side) caused by the air A1 from which dust has been sufficiently removed flowing out from anywhere other than the second opening 14, and therefore the dust collecting capacity of the dust collecting device 1 is improved.

[0029] Furthermore, first opening 13 and second opening 14 are provided so as to be offset in the X-axis direction, which is the direction along first wall surface 11a. As shown in Figures 1 to 3, housing 10 is configured so that the dimension in the X-axis direction is longer than the dimension in the Y-axis direction. Also, housing 10 is configured so that the dimension in the Y-axis direction is longer than the dimension in the Z-axis direction. In this configuration, by displacing the first opening 13 and the second opening 14 in the X-axis direction, the air A1 that flows into the housing 10 from the first opening 13 flows in the X-axis direction, which is a longer distance, and it is possible to lengthen the time that the air A1 passes around the discharge electrode 20. As a result, the dust collecting device 1 according to the first embodiment has improved dust collection efficiency.

[0030] Furthermore, the first opening 13 and the second opening 14 do not overlap in the Z-axis direction, which is a direction perpendicular to the first wall surface 11a. Therefore, a blocking portion 15, not the second opening 14, is disposed at a position on the second wall surface 12a opposite the first opening 13. With this configuration, the blocking portion 15 prevents the air A1 that flows into the housing 10 from flowing straight through the first opening 13, and the air A1 changes direction at the blocking portion 15 and travels inside the housing 10 toward the other end (the end in the negative direction of the X-axis). As a result, the time that the air A1 passes around the discharge electrode 20 can be lengthened. Therefore, the dust collecting device 1 according to the first embodiment has improved dust collection efficiency. The X-axis direction is also referred to as the "first direction," the Z-axis direction is also referred to as the "second direction," and the Y-axis direction is also referred to as the "third direction."

[0031] Next, a comparative example of the dust collecting device 1 according to the first embodiment will be described with reference to FIGS. Fig. 5 is a perspective view showing a conventional dust collecting device 100 according to a comparative example. Fig. 6 is an exploded perspective view showing a conventional dust collecting device 100 according to a comparative example. Fig. 7 is a cross-sectional view schematically showing air flow in a conventional dust collecting device 100 according to a comparative example. The conventional dust collecting device 100 has the same configuration as the dust collecting device 1 according to embodiment 1, except that the first frame 111 and the second frame 112 constituting the housing 110 are different from the first frame 11 and the second frame 12 described above.

[0032] 5 and 6, the first opening 113 formed in the first wall surface 111a of the first frame 111 has a rectangular shape that extends long in the X-axis direction so as to be the longest length without exposing the first support member 40 and the second support member 41. The second opening 114 formed in the second wall surface 112a of the second frame 112 has the same rectangular shape as the first opening 113, and is disposed at a position facing the first opening 113. Next, the air flow inside the housing 110 will be described with reference to Fig. 7. Fig. 7 is a diagram showing a cross-sectional structure of the housing 110, taken along the XZ plane at the center portion in the Y-axis direction, when the first frame 111 and the second frame 112 are combined. For ease of viewing, the discharge electrode 20, the counter electrode 30, the first support member 40, and the second support member 41 of the dust collecting device 100 are not shown.

[0033] 7, air A2 containing dust flows into housing 110 from first opening 113. Air A2 that has flowed into housing 110 continues to travel straight and is discharged from second opening 114 opposite first opening 113. That is, air A2 that has flowed into housing 110 travels straight in a direction (Z-axis direction) perpendicular to the direction in which discharge electrode 20 and counter electrode 30 extend (X-axis direction), and passes between discharge electrode 20 and counter electrode 30 in a short time.

[0034] Comparing air A1 passing through housing 10 in the first embodiment with air A2 passing through housing 110 in the comparative example, if air A1 and air A2 travel at the same speed, air A1 takes longer to pass between discharge electrode 20 and counter electrode 30. The area between discharge electrode 20 and counter electrode 30 is an area where Coulomb force acts, and dust becomes charged while passing through this area, and the charged dust is adsorbed to the counter electrode 30. Therefore, air A1 is subjected to Coulomb force for a longer time than air A2, and therefore more dust can be removed. Therefore, dust collector 1 using housing 10 achieves higher collection efficiency for dust-laden air traveling at the same speed than dust collector 100 using housing 110.

[0035] Here, in a conventional dust collector 100, if one were to attempt to increase the collection efficiency without changing the shapes of the first opening 113 and the second opening 114, one possible structure would be to arrange the discharge electrodes 20 and the counter electrodes 30 in multiple stages in the Z-axis direction. However, in this structure, the shape of the housing 110 would become large in the Z-axis direction because multiple stages of the discharge electrodes 20 and the counter electrodes 30 must be accommodated. This would increase the size of the dust collector 100 itself, and depending on the environment in which the dust collector 100 is installed, it may be impossible to install a dust collector 100 of such a large size. In contrast, the dust collecting device 1 according to the first embodiment has high dust collection efficiency, so there is no need to connect the discharge electrodes 20 and the counter electrodes 30 in multiple stages in the Z-axis direction. As a result, the size of the dust collecting device 1 does not increase, so the dust collecting device 1 can be installed even if a large space is not available.

[0036] Embodiment 2 8 is a perspective view showing a dust collecting device 200 according to embodiment 2. Dust collecting device 200 according to embodiment 2 differs from dust collecting device 1 according to embodiment 1 in that dust collecting device 200 according to embodiment 2 includes a housing 210 instead of housing 10. Other configurations of dust collecting device 200 are the same as or equivalent to those of dust collecting device 1, and therefore, redundant explanations will be omitted.

[0037] As shown in FIG. 8, the housing 210 is made up of a first frame 211 in the shape of a rectangular parallelepiped with one open face, and a second frame 212 also in the shape of a rectangular parallelepiped with one open face. The first frame 211 has a rectangular first wall surface 211a that forms the bottom surface, and peripheral surfaces 211b, 211c, 211d, and 211e that extend perpendicularly from four end sides of the first wall surface 211a. The surface of the first frame 211 that faces the first wall surface 211a is an open surface.

[0038] Similarly, second frame 212 has a rectangular second wall surface 212a that forms the bottom surface, and peripheral surfaces 212b, 212c, 212d, and 212e that extend perpendicularly from four end sides of second wall surface 212a. The surface of second frame 212 that faces second wall surface 212a is an open surface.

[0039] First wall surface 211a of first frame 211 is formed slightly larger than second wall surface 212a of second frame 212. Therefore, by inserting second frame 212 into first frame 211 with their open surfaces facing each other, the two are fitted together such that four peripheral surfaces 211b, 211c, 211d, and 211e of first frame 211 cover four peripheral surfaces 212b, 212c, 212d, and 212e of second frame 212, thereby forming box-shaped housing 210 having a substantially rectangular parallelepiped shape.

[0040] A rectangular first opening 213 is formed in the first wall surface 211a of the first frame 211. The first opening 213 has a shape that extends long in the X-axis direction so as to be the longest size without exposing the first support member 40 and the second support member 41. Meanwhile, a rectangular second opening 214 is formed in the second wall surface 212a of the second frame 212. The second opening 214 has a length that is approximately one-third of the length of the housing 210 in the X-axis direction. The second opening 214 is disposed closer to the other end side (the negative side of the X-axis) of the second wall surface 212a. With this configuration, the opening area of ​​the first opening 213 formed in the first wall surface 211a is larger than the opening area of ​​the second opening 214 formed in the second wall surface 212a.

[0041] The second wall surface 212a has a blocking portion 215 that prevents air that has flowed in from the first opening 213 from traveling in a straight line. Here, the blocking portion 215 and the second opening 214 are arranged side by side at a position on the second wall surface 212a opposite the first opening 213. That is, the blocking portion 215 is arranged on one end side (the positive side of the X axis) at a position opposite the first opening 213. The second opening 214 is arranged on the other end side (the negative side of the X axis) at a position opposite the first opening 213.

[0042] Next, the air flow in the dust collecting device 200 according to the second embodiment will be described with reference to Fig. 9. Fig. 9 is a diagram showing a cross-sectional structure of the central portion in the Y-axis direction of the housing 210 cut along the XZ plane in a state in which the first frame 211 and the second frame 212 are combined. For ease of viewing, the discharge electrode 20, the counter electrode 30, the first support member 40, and the second support member 41 of the dust collecting device 200 are not shown.

[0043] 9, dust-laden air A31, A32, and A33 flows into housing 210 from first opening 213. Second opening 214 is provided on the other end side (the negative side of the X axis) of second wall surface 212a facing first opening 213. Therefore, air A31 that flows into housing 210 from the other end side (the negative side of the X axis) of first opening 213 travels straight and is discharged from second opening 214 facing first opening 213. On the other hand, a blocking portion 215 is provided on one end side (the positive side of the X axis) of the second wall surface 212a facing the first opening 213. Therefore, the air A32, A33 that flows into the housing 210 from one end side (the positive side of the X axis) of the first opening 213 cannot travel in a straight line and instead travels inside the housing 210 toward the other end (the end in the negative direction of the X axis). Because the discharge electrode 20 and the counter electrode 30 extend parallel to each other along the X axis inside the housing 10, the air A32, A33 traveling inside the housing 10 passes between the discharge electrode 20 and the counter electrode 30 over time, during which time much dust is charged by corona discharge. As a result, much dust is adsorbed onto the counter electrode 30, and the air A32, A33 from which the dust has been sufficiently removed reaches the other end (the end in the negative direction of the X axis) inside the housing 210. Then, the air A32 and A33 that reaches the other end of the housing 210 is discharged from the second opening 214.

[0044] As described above, dust collecting device 200 according to the second embodiment has blocking portion 215 on one end side (positive side of the X axis) of second wall surface 212a facing first opening 213. Therefore, air A32, A33 that flows into housing 210 from one end side (positive side of the X axis) of first opening 213 travels toward the other end (end on the negative side of the X axis) and passes between discharge electrode 20 and counter electrode 30 extending along the X axis direction over a period of time, thereby sufficiently removing dust contained in air A32, A33. As a result, dust collecting efficiency of dust collecting device 200 according to the second embodiment is improved.

[0045] Furthermore, first opening 213 has a shape that is elongated in the X-axis direction, and therefore has a larger opening area than second opening 214. That is, the opening area of ​​first opening 213 is the sum of the opening area of ​​second opening 214 and the area of ​​closing portion 215. Therefore, dust collecting device 200 according to the second embodiment can reduce the load on the blower that sends in dust-containing air A31, A32, A33.

[0046] Embodiment 3 10 is a perspective view showing a dust collecting device 300 according to embodiment 3. The dust collecting device 300 according to embodiment 3 differs from the dust collecting device 1 according to embodiment 1 in that it includes a wire-shaped discharge electrode 320 instead of the needle-shaped discharge electrode 20, a first support member 340 and a second support member 341 instead of the first support member 40 and the second support member 41, and a discharge electrode connecting terminal 321 instead of the first discharge electrode connecting terminal 22 and the second discharge electrode connecting terminal 23. The other configuration of the dust collecting device 300 is the same as or equivalent to that of the dust collecting device 1, and therefore a duplicated description will be omitted.

[0047] 10, the wire-shaped discharge electrode 320 is supported by a first support member 340 and a second support member 341 while being folded back multiple times at positions that correspond to the ends of the counter electrode 30. The folded back ends of the wire-shaped discharge electrode 320 are electrically connected by a discharge electrode connection terminal 321.

[0048] 10 shows an exploded perspective view, and when the dust collecting device 200 is assembled from the state shown in this figure, the discharge electrode 320 and the counter electrode 30 are arranged so that each of the multiple portions of the discharge electrode 320 extending in the X-axis direction is located between multiple counter electrodes 30 that are arranged opposite each other in the Y-axis direction. In other words, the discharge electrode 320 and the counter electrode 30 are arranged so as to face each other in the Y-axis direction. With this configuration, the discharge electrode 320 functions as a charging part, and the counter electrode 30 functions as a dust collecting part, similar to when a needle-shaped discharge electrode 20 is used. Furthermore, if the discharge electrode 320 is wire-shaped, the parts can be easily replaced, and therefore maintenance performance is excellent. In the third embodiment, as an example, a configuration has been described in which the wire-shaped discharge electrode 320 is provided instead of the needle-shaped discharge electrode 20, but the discharge electrode may be other than wire-shaped, for example, rod-shaped.

[0049] Embodiment 4 Next, application examples of the dust collecting devices 1, 200, and 300 according to the first, second, and third embodiments will be described. Here, the dust collecting devices 1, 200, and 300 may be used alone or in combination with other devices. In the present embodiment, a ventilation system including the dust collecting device 1, 200, and 300 and a ventilation device will be described as an example of combining the dust collecting device 1, 200, and 300 with other devices.

[0050] FIG. 11 is a diagram showing an example of the configuration of a ventilation system 400 according to the fourth embodiment. As shown in Fig. 11, ventilation system 400 includes dust collecting device 1 and ventilation device 410. Fig. 11 illustrates, as an example, a device configuration in which ventilation system 400 is installed in the attic of a house. Dust collecting device 1 and ventilation device 410 are installed on ceiling 420. Although not shown, dust collecting device 1 and ventilation device 410 are installed by being suspended by support members such as anchor bolts. Note that when dust collecting device 1 is used in combination with ventilation device 410 as in this embodiment, a fan provided in ventilation device 410 controls the flow rate of air flowing into dust collecting device 1, so dust collecting device 1 does not need to be provided with a fan.

[0051] An outdoor air inlet 422 is provided on an exterior wall 421 of the house. An indoor air inlet 423 is provided on a ceiling 420. The outdoor air inlet 422 and dust collecting device 1 are connected by a duct 424a. The dust collecting device 1 and ventilation device 410 are connected by a duct 424b. The ventilation device 410 and indoor air inlet 423 are connected by a duct 424c. That is, in ventilation system 400, the dust collecting device 1 and ventilation device 410 are arranged in this order in the air intake flow path leading from the outdoor air inlet 422 to the indoor air inlet 423. Duct 424a is also referred to as a "first duct." Duct 424b and duct 424c are also referred to as a "second duct."

[0052] When ventilation device 410 is driven, air flows from outdoor air inlet 422 toward indoor air inlet 423. That is, outdoor air is supplied indoors. At this time, the outdoor air is air A41 containing dust such as PM2.5 and pollen. In ventilation system 400, dust collector 1 and ventilation device 410 are disposed in the air supply flow path from outdoor air inlet 422 toward indoor air inlet 423, so that dust can be removed from air A41 by dust collector 1. As a result, purified air A42 is supplied indoors.

[0053] The order in which the dust collecting device 1 and the ventilation device 410 are arranged in the air supply passage may be reversed. That is, in the present embodiment, the dust collecting device 1 is arranged on the upstream side and the ventilation device 410 is arranged on the downstream side in the air supply passage, but this embodiment is not limited to this arrangement, and the ventilation device 410 may be arranged on the upstream side and the dust collecting device 1 on the downstream side.

[0054] The ventilation device 410 is, for example, a total heat exchange type ventilation device equipped with a total heat exchanger (not shown). When the ventilation device 410 is a total heat exchange type ventilation device, the ventilation system 400 is provided with an exhaust passage (not shown). In the ventilation device 410, air that flows through the intake air passage from outdoors to indoors and air that flows through the exhaust passage from indoors to outdoors pass through the total heat exchanger, and heat exchange occurs between the two. However, this embodiment is not limited to such a configuration, and various known devices may be used as the ventilation device 410. For example, the ventilation device 410 may not have a heat exchange function and may simply supply and exhaust air.

[0055] As described above, the ventilation system 400 according to the fourth embodiment includes the dust collecting device 1 according to the first embodiment, and therefore, the same effects as those of the dust collecting device 1 described above can be obtained. In this embodiment, as an example, a case has been described in which the ventilation system 400 is equipped with the dust collecting device 1, but the ventilation system may be equipped with the above-mentioned dust collecting device 200 or dust collecting device 300 instead of the dust collecting device 1.

[0056] The configurations described in the above embodiments are merely examples, and may be combined with other known technologies. Furthermore, embodiments may be combined with each other, and some of the configurations may be omitted or modified without departing from the spirit of the invention.

[0057] Various aspects of the present disclosure are summarized below as appendices.

[0058] (Appendix 1) a discharge electrode to which a voltage is applied; a counter electrode disposed opposite the discharge electrode and generating a corona discharge between the counter electrode and the discharge electrode; a rectangular parallelepiped housing that houses the discharge electrode and the counter electrode, The housing includes: a first wall surface having a first opening formed therein for allowing air to flow in; a second wall surface facing the first wall surface and having a second opening formed therein for discharging the air that has flowed in from the first opening, The dust collecting device has a blocking portion at a position on the second wall surface opposite the first opening, the blocking portion preventing the air that has flowed in from the first opening from traveling in a straight line. (Appendix 2) The dust collecting device described in Appendix 1 has a second blocking portion at a position on the first wall surface opposite the second opening, which prevents air that flows in from the first opening and flows inside the housing from flowing out from any opening other than the second opening. (Appendix 3) The dust collecting device according to claim 1 or 2, wherein the first opening and the second opening are provided so as to be shifted from each other in a first direction that is a longitudinal direction of the first wall surface. (Appendix 4) 4. The dust collecting device according to claim 3, wherein the first opening and the second opening do not overlap in a second direction that is a direction perpendicular to the first wall surface. (Appendix 5) The discharge electrodes and the counter electrodes are each provided in plurality, The discharge electrodes and the counter electrodes extend in the first direction and are arranged alternately in a third direction perpendicular to the first direction and the second direction, The dust collecting device according to claim 4, wherein the housing has a dimension in the first direction that is longer than a dimension in the third direction, and the dimension in the third direction that is longer than a dimension in the second direction. (Appendix 6) 2. The dust collecting device according to claim 1, wherein an opening area of ​​the first opening is larger than an opening area of ​​the second opening. (Appendix 7) 7. The dust collecting device according to claim 6, wherein the closing portion and the second opening are arranged side by side at a position on the second wall surface opposite to the first opening. (Appendix 8) 8. The dust collecting device according to claim 1, wherein the discharge electrode is a wire electrode. (Appendix 9) A dust collecting device according to any one of Supplementary Note 1 to Supplementary Note 8; a first duct connecting the outdoor supply port and the dust collecting device; a second duct connecting the indoor supply port and the dust collecting device; a ventilation device provided in either the first duct or the second duct, for supplying outdoor air into the room. [Explanation of symbols]

[0059] 1,200,300 Dust collecting device, 10,210 Housing, 11a,211a First wall, 12a,212a Second wall, 13,213 First opening, 14,214 Second opening, 15,215 Blocking portion, 16 Blocking portion (second blocking portion), 20,320 Discharge electrode, 30 Counter electrode, 400 Ventilation system, 410 Ventilation device, 422 Outdoor air intake, 423 Indoor air intake, 424a Duct (first duct), 424b,424c Duct (second duct).

Claims

1. a discharge electrode to which a voltage is applied; a counter electrode disposed opposite the discharge electrode and generating a corona discharge between the counter electrode and the discharge electrode; a rectangular parallelepiped housing that houses the discharge electrode and the counter electrode, The housing includes: a first wall surface having a first opening formed therein for allowing air to flow in; a second wall surface facing the first wall surface and having a second opening formed therein for discharging the air that has flowed in from the first opening, The dust collecting device has a blocking portion at a position on the second wall surface opposite the first opening, which prevents air that has flowed in through the first opening from traveling in a straight line.

2. The dust collecting device according to claim 1, further comprising a second blocking portion at a position on the first wall surface opposite the second opening, the second blocking portion preventing air flowing in through the first opening and flowing inside the housing from flowing out through any opening other than the second opening.

3. The dust collecting device according to claim 1 or 2, wherein the first opening and the second opening are provided so as to be shifted from each other in a first direction, which is a longitudinal direction of the first wall surface.

4. The dust collecting device according to claim 3 , wherein the first opening and the second opening do not overlap in a second direction that is a direction perpendicular to the first wall surface.

5. The discharge electrodes and the counter electrodes are each provided in plurality, the discharge electrodes and the counter electrodes extend in the first direction and are arranged alternately in a third direction perpendicular to the first direction and the second direction, The dust collecting device according to claim 4 , wherein the dimension of the housing in the first direction is longer than the dimension in the third direction, and the dimension in the third direction is longer than the dimension in the second direction.

6. The dust collecting device according to claim 1 , wherein an opening area of ​​the first opening is larger than an opening area of ​​the second opening.

7. The dust collecting device according to claim 6 , wherein the closing portion and the second opening are arranged side by side at a position on the second wall surface opposite to the first opening.

8. 3. The dust collecting device according to claim 1, wherein the discharge electrode is a wire electrode.

9. The dust collecting device according to claim 1 or 2; a first duct connecting the outdoor supply port and the dust collecting device; a second duct connecting the indoor supply port and the dust collecting device; a ventilation device provided in either the first duct or the second duct, which supplies outdoor air into the room.

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