JP2020030966A - Particle adhesion prevention device and separation system comprising the same - Google Patents

Abstract

To provide a particle adhesion prevention device and a separation system, capable of preventing adhesion of particles.SOLUTION: A particle adhesion prevention device 6 comprises: a piezoelectric material part 60; a capacitor first electrode 61; a capacitor second electrode 62; and a discharge electrode 63. The piezoelectric material part 60 has a first principal surface 601 and a second principal surface 602. The capacitor first electrode 61 is disposed on the first principal surface 601 so as to expose a part of the first principal surface 601 of the piezoelectric material part 60 as a pressure receiving surface 64 for receiving a pressure of gas. The capacitor first electrode 61 collects positive electric charge generated at the piezoelectric material part 60. The capacitor second electrode 62 is disposed on the second principal surface 602 of the piezoelectric material part 60 so as to face the capacitor first electrode 61. The capacitor second electrode 62 collects negative electric charge generated at the piezoelectric material part 60. The discharge electrode 63 protrudes, from the capacitor first electrode 61, at an opposite side to a side of the piezoelectric material part 60 and has a sharp tip.SELECTED DRAWING: Figure 6

Description

  The present disclosure relates to a particle adhesion preventing device and a separation system including the same, and more particularly, to a particle adhesion preventing device for preventing particle adhesion, and a separation system including a cyclone and a particle adhesion preventing device.

  BACKGROUND ART Conventionally, a separator including a cyclone portion and an outer shell has been known (Patent Document 1).

  The cyclone unit includes a shaft, a frame, and a plurality of partition plates. The frame is cylindrical, and is arranged coaxially with the shaft surrounding the shaft. The plurality of partition plate portions are arranged apart from each other in the outer peripheral direction of the shaft between the shaft and the frame, and are connected to the shaft. The cyclone unit spirally circulates the gas between the shaft, the frame, and the plurality of partition plates, and separates the solid by using the centrifugal force of the solid (particles or the like) due to the swirl.

  In the separator, an outlet is formed in the outer shell, and solids given a greater centrifugal force are discharged through the outlet.

International Publication No. WO 2016/092847

  In the separator described in Patent Literature 1, solids (particles) discharged from the cyclone portion when the rotating body is rotated adhere to the inner peripheral surface of the outer shell (cover), and a desired separation performance (for example, , Separation efficiency).

  An object of the present disclosure is to provide a particle adhesion preventing device capable of preventing particle adhesion and a separation system including the same.

  A particle adhesion preventing device according to an aspect of the present disclosure includes a piezoelectric material portion, a first electrode for a capacitor, a second electrode for a capacitor, and an electrode for discharging. The piezoelectric material portion has a first main surface and a second main surface. The piezoelectric material portion has piezoelectricity. The first electrode for a capacitor is arranged on the first main surface so as to expose a part of the first main surface of the piezoelectric material portion as a pressure receiving surface that receives gas pressure. The first electrode for a capacitor collects positive charges generated in the piezoelectric material portion. The second electrode for a capacitor is disposed on the second main surface of the piezoelectric material portion so as to face the first electrode for a capacitor. The second electrode for a capacitor collects a negative charge generated in the piezoelectric material portion. The discharge electrode protrudes from the capacitor first electrode to the opposite side to the piezoelectric material portion side and has a sharp tip.

  A separation system according to an aspect of the present disclosure includes a cyclone, a cover, and the particle adhesion preventing device. The cyclone has an inlet, an outlet, and a discharge hole. The cyclone discharges particles from the discharge holes using centrifugal force generated in particles in the gas by a swirling flow of gas flowing from the inlet and flowing out of the outlet. The cover has first and second openings corresponding to the inlet and the outlet, respectively, and an exhaust hole. The cover surrounds the cyclone. The particle adhesion preventing device is disposed such that the first main surface of the first main surface and the second main surface of the piezoelectric material portion faces the cyclone.

  ADVANTAGE OF THE INVENTION The particle adhesion prevention apparatus of this indication and the separation system provided with the same can prevent adhesion of particles.

FIG. 1 is a schematic configuration diagram of a separation system including a particle adhesion preventing device according to Embodiment 1 of the present disclosure. FIG. 2A is a perspective view showing a cyclone in a separation system including the above-described particle adhesion preventing device, as viewed from an inlet side of a cylindrical body. FIG. 2B is a perspective view showing a cyclone in the separation system provided with the above-described particle adhesion preventing device, viewed from an outlet side of a cylindrical body. FIG. 3 is an exploded perspective view of the separation system including the particle adhesion preventing device according to the first embodiment, with a part thereof omitted. FIG. 4 is a cross-sectional view of the cyclone, the cover, and the particle adhesion preventing device in the separation system including the above particle adhesion preventing device, taken along the center axis of the cylinder. FIG. 5 is a cross-sectional view of the cyclone, the cover, and the particle adhesion preventing device in the separation system including the particle adhesion preventing device, which is orthogonal to the central axis of the cylinder. FIG. 6 is a perspective view of the above particle adhesion preventing device. FIG. 7A is an operation explanatory diagram when a gas pressure is applied to the above-described particle adhesion preventing device. FIG. 7B is an operation explanatory diagram when a positively charged particle approaches the above-described particle adhesion preventing device. FIG. 8A is a cross-sectional view of a separation system including a particle adhesion prevention device according to Embodiment 2 of the present disclosure. FIG. 8B is a perspective view of a main part of a separation system including the above-described particle adhesion preventing device.

  Each drawing described in the following embodiments and the like is a schematic drawing, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio.

(Embodiment 1)
Hereinafter, a particle adhesion preventing device 6 according to the first embodiment and a separation system 100 including the same will be described with reference to FIGS.

  The separation system 100 includes a cyclone 1, a cover 10 surrounding the cyclone 1, and a particle adhesion preventing device 6.

The cyclone 1 is provided, for example, on the upstream side of an air conditioner having a blowing function, and separates solids (particles) in air (gas). The air conditioner is, for example, a blower that blows air from an upstream side to a downstream side. The blower is, for example, an electric fan. The air conditioner is not limited to the blower, but may be, for example, a ventilator, an air conditioner, an air supply cabinet fan, or an air conditioning system including a blower and a heat exchanger. Flow rate of air flowing through the cyclone 1 by the air conditioning equipment, for example, a 100m ³ / h~300m ³ / h. The amount of outflow from the cyclone 1 to the air conditioning equipment is substantially the same as the flow rate of air flowing through the air conditioning equipment.

  As shown in FIGS. 2A and 2B to 5, the cyclone 1 includes a cylinder 2, a rotating body 3, a plurality of blades 36, and a motor 4. The cylindrical body 2 has a gas inlet 23 at a first end 21 and a gas outlet 24 at a second end 22. The rotating body 3 is disposed inside the cylindrical body 2. The plurality of blades 36 are connected to the rotating body 3. In the cyclone 1, as shown in FIG. 4, a flow path 5 from the inflow port 23 to the outflow port 24 is formed between the cylindrical body 2 and the rotating body 3. The motor 4 rotates the rotating body 3. Here, the cyclone 1 includes a shaft 7 connected to both the rotating body 3 and the rotating shaft 42 of the motor 4. Further, the cyclone 1 includes a shaft coupling (shaft coupling) 8 for connecting the shaft 7 and the rotating shaft 42 of the motor 4 (see FIGS. 3 and 4). In the separation system 100, the motor 4 constitutes a driving device for rotating the rotating body 3.

  The cyclone 1 can flow the air that has flowed into the flow path 5 from the upstream side to the downstream side of the flow path 5 while spirally rotating around the rotating body 3. The “upstream side” here means the upstream side (primary side) when viewed in the direction of air flow. Further, “downstream side” means the downstream side (secondary side) when viewed in the direction of air flow. The cylinder 2 of the cyclone 1 has a discharge hole 25 (see FIGS. 3 and 5) penetrating in the thickness direction of the cylinder 2 in order to discharge solids contained in air to the outside of the cylinder 2. . The discharge hole 25 connects the internal space of the cylindrical body 2 and the external space of the cylindrical body 2 (the space between the cylindrical body 2 and the cover 10). In other words, the discharge hole 25 connects the inside and the outside of the cylindrical body 2.

  Examples of the solids (particles) in the air include fine particles and dust. Examples of the fine particles include a particulate substance. Examples of the particulate matter include primary product particles that are directly released into the air as fine particles, and secondary product particles that are generated as fine particles in the air that are released into the air as a gas. Examples of the primary particles include soil particles (eg, yellow sand), dust, plant particles (eg, pollen), animal particles (eg, mold spores), and soot. As the classification of the size of the particulate matter, for example, PM2.5 (fine particulate matter), PM10, SPM (suspended particulate matter), and the like can be given. PM2.5 is fine particles that pass through a particle sizer having a particle diameter of 2.5 μm and a collection efficiency of 50%. PM10 is fine particles that pass through a particle sizer having a particle diameter of 10 μm and a collection efficiency of 50%. SPM is a fine particle that passes through a particle sizer having a particle diameter of 10 μm and a collection efficiency of 100%, corresponds to PM 6.5-7.0, and is slightly smaller than PM10.

  Each component of the separation system 100 is described in more detail below.

  As described above, the cyclone 1 includes the cylindrical body 2, the rotating body 3, the plurality of blades 36, the motor 4, the shaft 7, and the shaft coupling 8.

  The cylindrical body 2 is formed in a cylindrical shape, and has a gas inlet 23 at a first end 21 and a gas outlet 24 at a second end 22. The material of the cylinder 2 is, for example, an ABS resin.

  As shown in FIGS. 4 and 5, the rotating body 3 is disposed coaxially with the cylindrical body 2 inside the cylindrical body 2. The phrase “disposed coaxially with the cylinder 2” means that the rotating body 3 aligns the rotation center axis 30 (see FIG. 4) of the rotating body 3 with the center axis 20 (see FIG. 4) of the cylinder 2. It means that it is arranged in. In the rotating body 3, an outer peripheral line in a cross section orthogonal to the rotation center axis 30 (for example, see FIG. 5) is circular. The material of the rotating body 3 is, for example, a polycarbonate resin.

  In the direction along the rotation center axis 30 of the rotating body 3, the length of the rotating body 3 is shorter than the length of the cylindrical body 2. As shown in FIG. 4, the rotating body 3 has a first end 31 on the inlet 23 side and a second end 32 on the outlet 24 side. The first end 31 of the rotating body 3 is disposed between the inlet 23 and the outlet 24 of the cylindrical body 2 and near the inlet 23 in a direction along the central axis 20 of the cylindrical body 2. The second end 32 of the rotating body 3 is disposed between the inflow port 23 and the outflow port 24 of the cylinder 2 and near the outflow port 24 in a direction along the central axis 20 of the cylinder 2. I have.

  A plurality of (here, 24) blades 36 connected to the rotating body 3 are arranged between the cylindrical body 2 and the rotating body 3. The material of each of the plurality of blades 36 is, for example, a polycarbonate resin.

  Each of the plurality of blades 36 is arranged such that a gap is formed between the plurality of blades 36 and the inner peripheral surface 27 of the cylindrical body 2 as shown in FIGS. In other words, the cyclone 1 has a gap between each of the plurality of blades 36 and the inner peripheral surface 27 of the cylindrical body 2. That is, the length of each of the plurality of blades 36 protruding from the outer circumferential surface 37 of the rotating body 3 is determined by the distance between the outer circumferential surface 37 of the rotating body 3 and the inner circumferential surface 27 of the cylindrical body 2 in the radial direction of the rotating body 3. Is also short. Each of the plurality of blades 36 is disposed parallel to the rotation center axis 30 of the rotating body 3 in a space (flow path 5) between the outer circumferential surface 37 of the rotating body 3 and the inner circumferential surface 27 of the cylindrical body 2. . Each of the plurality of blades 36 has a flat plate shape. Each of the plurality of blades 36 is inclined by a predetermined angle (for example, 45 degrees) with respect to one radial direction of the rotating body 3 when viewed from the inflow port 23 side in a direction along the central axis 20 of the cylindrical body 2. . Here, in each of the plurality of blades 36, the distal end on the side of the cylindrical body 2 in the protruding direction from the rotating body 3 is positioned behind the base end on the rotating body 3 side in the rotating direction A1 of the rotating body 3. I have. That is, in the cyclone 1, each of the plurality of blades 36 is inclined by a predetermined angle (for example, 45 degrees) in the rotation direction A1 of the rotating body 3 with respect to one radial direction of the rotating body 3. The predetermined angle is not limited to 45 degrees, and may be an angle greater than 0 degrees and 90 degrees or less. For example, the predetermined angle may be an angle in a range from 10 degrees to 80 degrees. Each of the plurality of blades 36 is not limited to a case in which the blade 36 is inclined by a predetermined angle in the rotation direction A1 of the rotating body 3 with respect to the radial direction of the rotating body 3. May be 0 degrees. That is, the plurality of blades 36 may extend radially from the rotating body 3. The plurality of blades 36 are arranged at substantially equal intervals in the circumferential direction of the rotating body 3 as shown in FIG.

  As shown in FIGS. 3 and 4, the rotating body 3 includes two rotating members 3a and 3b arranged in a direction along the central axis 20 of the cylindrical body 2 (see FIG. 4). The rotating members 3a and 3b are formed in a bottomed cylindrical shape as shown in FIG. More specifically, the two rotating members 3a, 3b have bottom walls 33a, 33b at first ends 31a, 31b on the inlet 23 side, and openings 34a, 32b at second ends 32a, 32b on the outlet 24 side. 34b. Hereinafter, of the two rotating members 3a and 3b, for convenience of description, the rotating member 3a located closer to the inlet 23 (relatively upstream) is referred to as the upstream rotating member 3a, and is located closer to the outlet 24 ( The rotating member 3b located on the relatively downstream side may be referred to as a downstream rotating member 3b. In the bottomed cylindrical upstream rotating member 3a, the bottom wall 33a is formed in a shape bulging toward the inflow port 23 side. Thereby, in the cyclone 1, it is possible to reduce the pressure loss of the gas flowing from the inlet 23 of the cylinder 2. A reinforcing wall 38 integral with the upstream rotating member 3a is provided inside the upstream rotating member 3a. Further, inside the bottomed cylindrical downstream rotating member 3b, a cylindrical rib 39 protruding from the center of the bottom wall 33b of the downstream rotating member 3b toward the opening 34b is provided. In the direction along the central axis 20 of the cylindrical body 2, the length of the rib 39 is shorter than the length of the downstream rotation member 3b.

  In the cyclone 1, each of the plurality of blades 36 includes a blade piece 36a protruding from the outer peripheral surface of the upstream rotating member 3a and a blade piece 36b protruding from the outer peripheral surface of the downstream rotating member 3b. (See FIG. 4). In other words, in the cyclone 1, a plurality (24) blade pieces 36 a connected to the upstream rotation member 3 a and a plurality (24) blade pieces 36 b connected to the downstream rotation member 3 b are one-to-one. And a plurality of (24) blades 36 are configured. Hereinafter, for convenience of description, the blade piece 36a may be referred to as an upstream blade piece 36a, and the blade piece 36b may be referred to as a downstream blade piece 36b.

  The plurality of upstream blade pieces 36a are arranged at equal angular intervals (15 degrees) in the circumferential direction of the rotating body 3. The “equiangular intervals” here need not be exactly the same intervals, but may be any angular intervals within a predetermined angle range (specified angle ± 20%: 15 degrees ± 3 degrees). The plurality of downstream blade pieces 36b are arranged at equal angular intervals (15 degrees) in the circumferential direction of the rotating body 3. The “equiangular intervals” here need not be exactly the same intervals, but may be any angular intervals within a predetermined angle range (specified angle ± 20%: 15 degrees ± 3 degrees). The one-to-one upstream blade piece 36a and the downstream blade piece 36b are aligned on a straight line in a direction parallel to the central axis 20 of the cylindrical body 2.

  The rotating body 3 is connected to a rotating shaft (shaft) 42 of the motor 4 via a shaft 7 and a shaft coupling 8 as shown in FIGS. More specifically, in the cyclone 1, the rotating body 3 is connected to the shaft 7, and the shaft 7 is connected to the rotating shaft 42 of the motor 4 by the shaft coupling 8. In the cyclone 1, the rotation shaft 42 and the shaft 7 are arranged so as to be aligned.

  The motor 4 rotates the rotating body 3 around the rotation center axis 30 of the rotating body 3. The rotation speed of the rotating body 3 is, for example, 1500 rpm to 3000 rpm. The motor 4 is, for example, a DC motor. The motor 4 is driven by, for example, an external drive circuit.

  As shown in FIG. 4, the motor 4 includes a motor main body 41 and the above-described rotating shaft 42 partially projecting from the motor main body 41. The rotation shaft 42 has a columnar shape. The motor 4 is arranged inside the rotating body 3. More specifically, the motor 4 is disposed inside the downstream rotation member 3b. Here, the cyclone 1 includes a motor housing 9 (see FIGS. 3 and 4) that houses the motor 4 and the shaft coupling 8. The motor housing 9 is housed in the downstream rotation member 3b. The motor housing 9 is fixed to a rear cover 12 described later by a plurality of screws.

  The material of the motor housing 9 is, for example, aluminum. The motor housing 9 has a housing body 90 and a flange 95 as shown in FIG. The housing main body 90 has a bottom wall 93 at a first end 91 on the inflow port 23 side, and has an opening 94 on a second end 92 on the outflow port 24 side. Here, in the motor housing 9, a circular hole 931 through which the shaft coupling 8 passes is formed in the bottom wall 93 of the housing main body 90. The motor housing 9 also has a bottomed cylindrical shaft coupling housing 98 that protrudes from the periphery of the hole 931 in the bottom wall 93 toward the inflow port 23. In the motor housing 9, a circular hole 987 through which the shaft 7 passes is formed in the bottom wall 983 of the shaft coupling housing 98. The flange 95 protrudes from the second end 92 of the housing main body 90 radially outward of the housing main body 90. The flange portion 95 is provided for fixing the motor housing 9 to the rear cover 12 with a plurality of screws.

  The shaft 7 (see FIGS. 3, 4 and 5) is in the shape of a round bar and has a first end 71 in the longitudinal direction and a second end 72 opposite to the first end 71. The material of the shaft 7 is, for example, stainless steel. The shaft 7 is arranged such that its axis coincides with the rotation center axis 30 of the rotating body 3. In other words, the shaft 7 is arranged such that its axis coincides with the central axis 20 of the cylinder 2. The shaft 7 is partially disposed in the rotating body 3. More specifically, in the cyclone 1, the first end 71 of the shaft 7 is disposed outside the first end 21 of the cylinder 2 in a direction along the central axis 20 of the cylinder 2, and the second end of the shaft 7 The end 72 is disposed inside the downstream rotation member 3b. Here, as shown in FIG. 4, the shaft 7 has a hole 35a formed at the center of the bottom wall 33a of the upstream rotating member 3a and a hole 35b formed at the center of the bottom wall 33b of the downstream rotating member 3b. And, it passes. The rotating body 3 is connected to the shaft 7 by two bolts 78 (see FIG. 4) and two nuts corresponding to the two bolts 78 one-to-one. Each of the two bolts 78 passes through a hole that penetrates the shaft 7 in the radial direction. Thereby, the rotating body 3 can rotate together with the shaft 7.

  The cyclone 1 includes a first bearing 75 and a second bearing 76 (see FIGS. 3 and 4) for rotatably supporting the shaft 7. Thereby, in the cyclone 1, the rotating body 3 can be more stably rotated by the motor 4. In the cyclone 1, the first bearing 75 rotatably supports the first end 71 of the shaft 7. In the cyclone 1, the second bearing 76 rotatably supports a portion near the second end 72 of the shaft 7. The second bearing 76 is fixed to the bottom wall 983 of the shaft coupling housing 98 with two screws. The second end 72 of the shaft 7 is connected to the rotating shaft 42 of the motor 4 by the shaft coupling 8. The shaft coupling 8 is arranged inside the downstream rotation member 3b.

  The cyclone 1 further includes a front cover 11 and a rear cover 12, as shown in FIGS.

  The front cover 11 is detachably attached to a first flange 211 (see FIG. 2B) protruding outward from the first end 21 of the cylindrical body 2 by a plurality of (for example, four) screws. The rear cover 12 is detachably attached to a second flange 221 (see FIG. 2A) protruding outward from the second end 22 of the cylindrical body 2 by a plurality of (for example, four) screws.

  When viewed from one direction along the center axis 20 of the cylindrical body 2, the outer peripheral shape of the front cover 11 is square. As shown in FIG. 2A, the front cover 11 includes a first frame portion 111, a bearing mounting portion 112, and four first beam portions 113. The first frame portion 111 is disposed so as to overlap the first flange 211. The outer peripheral shape of the first frame portion 111 is the same as the outer peripheral shape of the front cover 11. The inner peripheral shape of the first frame portion 111 is a circular shape. The inner diameter of the first frame portion 111 is substantially the same as the inner diameter of the cylinder 2. The first frame portion 111 is fixed to the first flange 211 with a plurality of screws. The bearing mounting portion 112 has an annular shape and is arranged inside the first frame portion 111. The first bearing 75 described above is attached to the bearing attachment portion 112. The four first beam portions 113 connect the first frame portion 111 and the bearing mounting portion 112. The four first beam portions 113 are arranged at substantially equal intervals in the circumferential direction of the bearing attachment portion 112. The first bearing 75 is a bush bearing, and is mounted on the bearing mounting portion 112 by being press-fitted into the bearing mounting portion 112. The material of the front cover 11 is, for example, aluminum.

  When viewed from one direction along the center axis 20 of the cylindrical body 2, the outer peripheral shape of the rear cover 12 is square. As shown in FIG. 2B, the rear cover 12 includes a second frame portion 121, a housing attachment portion 122, and four second beam portions 123. The outer peripheral shape of the second frame portion 121 is the same as the outer peripheral shape of the rear cover 12. The inner peripheral shape of the second frame portion 121 is a circular shape. The inner diameter of the second frame portion 121 is preferably the same as the inner diameter of the cylinder 2. The second frame portion 121 is disposed so as to overlap the second flange 221. The second frame portion 121 is fixed to the second flange 221 by a plurality of screws. The housing attachment part 122 is annular and is arranged inside the second frame part 121. The flange portion 95 of the motor housing 9 is disposed on the housing mounting portion 122 so as to overlap. The flange portion 95 of the motor housing 9 is fixed to the housing attachment portion 122 with a plurality of screws. The four second beam portions 123 connect the second frame portion 121 and the housing mounting portion 122. The four second beam portions 123 are arranged at substantially equal intervals in the circumferential direction of the housing attachment portion 122. The material of the rear cover 12 is, for example, aluminum.

  The cyclone 1 further includes a front panel 16, a rear panel 17, and a ventilation panel 18, as shown in FIGS.

  The outer peripheral shape of the front panel 16 is square. The front panel 16 has a ventilation hole 160 (see FIGS. 2A, 3 and 4) penetrating in the thickness direction. The front panel 16 is disposed on the front cover 11 on the side opposite to the cylinder 2 side. The front panel 16 is fixed to the front cover 11 by a plurality of screws. The opening shape of the ventilation hole 160 is circular. The inside diameter of the ventilation hole 160 is smaller than the inside diameter of the cylindrical body 2 and the outside diameter of the rotating body 3 and larger than the outside diameter of the bearing mounting portion 112 of the front cover 11. The material of the front panel 16 is, for example, aluminum.

  The outer peripheral shape of the rear panel 17 is square. The rear panel 17 has a ventilation hole 171 (see FIGS. 3 and 4) penetrating in the thickness direction. The rear panel 17 is arranged on the rear cover 12 on the side opposite to the cylinder 2 side. The rear panel 17 is fixed to the rear cover 12 with a plurality of screws. The opening shape of the ventilation hole 171 is circular. The inner diameter of the ventilation hole 171 is smaller than the inner diameter of the cylindrical body 2 and larger than the outer diameter of the rotating body 3 and the outer diameter of the housing mounting portion 122 of the rear cover 12. The material of the rear panel 17 is, for example, aluminum.

  The outer peripheral shape of the ventilation panel 18 is substantially circular. The outer diameter of the ventilation panel 18 is the same as the outer diameter of the housing mounting portion 122 (see FIG. 2B) of the rear cover 12. A mesh 181 (see FIG. 4) is provided at the center of the ventilation panel 18. The ventilation panel 18 is disposed on the housing cover 122 on the side of the rear cover 12 opposite to the side of the cylinder 2. The ventilation panel 18 is fixed to the housing mounting part 122 by a plurality of screws.

  In the cyclone 1, the rotating direction of the rotating body 3 connected to the shaft 7 is the same as the rotating direction of the rotating shaft 42 of the motor 4 (see FIG. 4). The rotation direction of the rotating body 3 is a clockwise direction (the direction of the arrow A1 in FIG. 5) when viewed from the inflow port 23 side of the cylindrical body 2. The rotation direction of the rotating body 3 is a counterclockwise direction when viewed from the outlet 24 side of the cylindrical body 2. The rotation angular velocity of the rotating body 3 is the same as the rotation angular velocity of the rotation shaft 42 of the motor 4.

  In the cyclone 1, when the rotating body 3 rotates by the rotation of the rotating shaft 42 of the motor 4, the rotating body 3 and the plurality of blades 36 rotate in the same direction. The cyclone 1 can apply a force in the rotation direction about the rotation center axis 30 (see FIG. 4) to the air flowing into the flow path 5 (see FIGS. 4 and 5) by the rotation of the rotating body 3. It becomes possible. In the cyclone 1, the rotation of the rotating body 3 causes the velocity vector of the air flowing through the flow path 5 to include a velocity component in a direction parallel to the rotation center axis 30 and a velocity component in a rotation direction around the rotation center axis 30. ,

  Regarding the separation characteristics of the cyclone 1, the separation efficiency tends to increase as the rotation speed of the rotating body 3 increases. Regarding the separation characteristics of the cyclone 1, the separation efficiency tends to increase as the particle size increases. In the cyclone 1, for example, the rotation speed of the rotating body 3 is preferably set so as to separate fine particles having a specified particle size or more. As the fine particles having a specified particle size, for example, particles having an aerodynamic particle size of 0.3 μm to 10 μm are assumed. By "aerodynamic particle size" is meant the diameter of a particle whose aerodynamic behavior is equivalent to a spherical particle with a specific gravity of 1.0. The aerodynamic particle size is the particle size determined from the sedimentation velocity of the particles. Examples of the solid that remains in the air without being separated by the cyclone 1 include, for example, fine particles having a smaller particle diameter than the particle that is assumed to be separated by the cyclone 1 (in other words, the particle that is separated by the cyclone 1 Fine particles having a mass smaller than the mass of the present fine particles).

  As described above, the cylinder 2 of the cyclone 1 has the discharge hole 25 (see FIGS. 3 and 5) penetrating in the thickness direction of the cylinder 2 between the first end 21 and the second end 22 of the cylinder 2. )have.

  The discharge hole 25 has an elongated slit shape in a direction inclined with respect to a direction parallel to the rotation center axis 30. Here, the discharge hole 25 has an elongated slit shape in a direction between a direction parallel to the rotation center axis 30 and the rotation direction A1 of the rotating body 3. More specifically, the discharge hole 25 has a spiral shape in a spiral direction along the rotation direction A1 of the rotating body 3. The “helical shape in the spiral direction” means a shape formed by at least a part of the spiral. At least a part of the helix means that the rotation number of the helix may be less than one. In the cyclone 1 in the separation system 100, the discharge hole 25 has a spiral rotation number of less than one.

  The above-described discharge hole 25 is formed from the first end 21 to the second end 22 of the cylindrical body 2. Thereby, in the cyclone 1, the inner peripheral surface 27 of the cylindrical body 2 is independent of the size of the solid in the air flowing into the cylindrical body 2 and the position in the direction along the central axis 20 (see FIG. 4) of the cylindrical body 2. (Refer to FIGS. 4 and 5) The solid passing through the vicinity can be discharged from the discharge hole 25.

  In the cyclone 1, the cylinder 2 has a plurality of discharge holes 25. The plurality of discharge holes 25 are arranged in the circumferential direction of the cylinder 2. Here, the plurality of discharge holes 25 are arranged at equal intervals in the circumferential direction of the cylindrical body 2. The “equal intervals” here need not be exactly the same intervals, and may be intervals within the first specified range (first specified distance ± 20%). In the cyclone 1, the plurality of discharge holes 25 have the same shape.

  In the cyclone 1, the outside air flows into the cylindrical body 2 through the ventilation hole 160 (see FIGS. 2A, 3 and 4) of the front panel 16 and the space inside the first frame portion 111 (see FIG. 2A) of the front cover 11. 23. The solids contained in the air that has flowed into the cylindrical body 2 move from the rotation center axis 30 of the rotating body 3 (see FIG. 4) to the inside of the cylindrical body 2 when spirally rotating in the flow path 5 (see FIG. 4). It receives centrifugal force in the direction toward the peripheral surface 27. The solid that has been subjected to the centrifugal force moves toward the inner peripheral surface 27 of the cylindrical body 2 and spirally rotates along the inner peripheral surface 27 near the inner peripheral surface 27 of the cylindrical body 2. Then, in the cyclone 1, some of the solids in the air are discharged from the discharge holes 25 (see FIG. 5) while passing through the flow path 5.

  In the cyclone 1, a swirling flow is generated inside the cylinder 2, so that a part of solids (dust and the like) in the air that has flowed into the cylinder 2 from the inlet 23 of the cylinder 2 is discharged through the discharge hole 25. Then, a part of the air (purified air) from which the solids (dust and the like) are separated (removed) flows out from the outlet 24 of the cylindrical body 2.

  The cyclone 1 can discharge the solids in the air flowing into the flow path 5 from the discharge holes 25 and can flow the air from which the solids have been separated to the downstream side. It becomes possible to separate well.

  The cyclone 1 is used, for example, in an air purification system installed in a house or the like, arranged upstream of an air filter such as a HEPA filter (high efficiency particulate air filter) arranged upstream of an air conditioner. The “HEPA filter” is an air filter having a particle collection rate of 99.97% or more for particles having a particle diameter of 0.3 μm at a rated flow rate and having an initial pressure loss of 245 Pa or less. The air filter does not require 100% particle collection efficiency as an essential condition. Since the air purification system includes the cyclone 1, it is possible to suppress particles such as PM2.5 from reaching the air filter. Therefore, in the air purification system, it is possible to extend the life of the air filter and the like located downstream of the cyclone 1. For example, in an air purification system, it is possible to suppress an increase in pressure loss due to an increase in the total mass of fine particles and the like collected by the air filter. Thus, in the air purification system, the frequency of replacing the air filter can be reduced. The air purification system is not limited to a configuration in which the air filter and the air conditioning equipment are housed in different housings, and may include an air filter in the housing of the air conditioning equipment. In other words, the air conditioner may include an air filter in addition to the air blower.

  The separation system 100 further includes a cover 10 and an exhaust device 13.

  The cover 10 surrounds the cyclone 1 as shown in FIG. Here, the cover 10 is arranged so as to surround the cylindrical body 2 over the entire circumference. The cover 10 has a first opening 103 and a second opening 104 corresponding to the inlet 23 and the outlet 24 of the cyclone 1, respectively. The first opening 103 and the second opening 104 are larger than the inlet 23 and the outlet 24, respectively. The cover 10 is cylindrical and has a first opening 103 at a first end 101 and a second opening 104 at a second end 102. Here, the cover 10 has a rectangular cylindrical shape whose longitudinal direction is along the center axis 20 of the cylindrical body 2. The opening shape of each of the first opening 103 and the second opening 104 is, for example, a square shape. The cover 10 has an exhaust hole 105 between the first end 101 and the second end 102. The exhaust hole 105 penetrates in the thickness direction of the cover 10. The opening shape of the exhaust hole 105 is, for example, circular. The material of the cover 10 is, for example, an ABS resin.

  The cover 10 is connected to the front cover 11 and the rear cover 12. More specifically, in the separation system 100, the first end 101 of the cover 10 is fixed to the front cover 11 by a plurality of screws, and the second end 102 of the cover 10 is fixed to the rear cover 12 by a plurality of screws. ing. In the direction along the center axis 20 of the cylinder 2, the length of the cover 10 is longer than the length of the cylinder 2. The length of the cover 10 in the direction orthogonal to the central axis 20 of the cylinder 2 is longer than the length (outer diameter) of the cylinder 2. In the separation system 100 shown in FIG. 1, the first duct 201 is connected to the front cover 11, and the second duct 202 is connected to the rear cover 12.

  The exhaust device 13 exhausts the inside of the cover 10 through the exhaust hole 105. Here, the exhaust device 13 includes a fan 131. The fan 131 is an exhaust fan. The exhaust fan is, for example, a sirocco fan, but is not limited to this. The separation system 100 includes an exhaust duct 108 extending from a peripheral edge of the exhaust hole 105 on the outer peripheral surface 107 of the cover 10. The separation system 100 includes an exhaust tube 109 connected to an exhaust duct 108. The exhaust device 13 exhausts the inside of the cover 10 through the exhaust hole 105, the exhaust duct 108, and the exhaust tube 109.

  The exhaust device 13 sucks a gas containing solids (particles 161 and the like) existing in the cover 10 by the fan 131. In the separation system 100, the gas exhausted from the inside of the cover 10 and the solid contained in the gas pass through the fan 131. The fan 131 is preferably, for example, an exhaust fan capable of adjusting an exhaust amount. In FIG. 1, the flow of air entering the cyclone 1 through the first duct 201 is indicated by a dotted arrow F1, and the flow of air exiting from the cyclone 1 through the second duct 202 is indicated by a dotted arrow F2. In FIG. 1, the flow of air exhausted from the cyclone 1 to the exhaust tube 109 through the exhaust hole 105 of the cover 10 is indicated by a solid arrow F3. FIG. 1 schematically shows the particles 161 contained in the air.

  As shown in FIG. 6, the particle adhesion preventing device 6 includes a piezoelectric material portion 60, a first electrode 61 for a capacitor, a second electrode 62 for a capacitor, and an electrode 63 for discharging.

The piezoelectric material section 60 has a first main surface 601 and a second main surface 602. The piezoelectric material part 60 has piezoelectricity. The piezoelectric material of the piezoelectric material part 60 is, for example, barium titanate (BaTiO ₃ ). The piezoelectric material is not limited to barium titanate. For example, lead titanate (PbTiO ₃ ), zirconate titanate (PZT), lithium niobate (LiNbO ₃ ), lithium tantalate (LiTaO ₃ ), polyvinylidene fluoride ( (PVDF) or the like. The piezoelectric material part 60 has a sheet shape. The piezoelectric material portion 60 may be in the form of a film or a plate. The film shape means a film formed by a film forming technique (for example, a sputtering method, a CVD method, a sol-gel method, a coating method, or the like). The thickness of this film is, for example, not less than 20 nm and less than 1 mm. The plate shape means that the piezoelectric material portion 60 is a plate that can handle itself. The thickness of this plate is, for example, 1 mm or more and 20 mm or less. The outer peripheral shape of the piezoelectric material portion 60 as viewed from the thickness direction of the piezoelectric material portion 60 is, for example, a rectangular shape.

  The capacitor first electrode 61 is arranged on the first main surface 601 of the piezoelectric material portion 60. The material of the capacitor first electrode 61 is, for example, a metal or an alloy. The capacitor first electrode 61 may be in the form of a film or a plate.

  The capacitor second electrode 62 is disposed on the second main surface 602 of the piezoelectric material section 60. The material of the capacitor second electrode 62 is, for example, a metal or an alloy. The capacitor second electrode 62 may be in the form of a film or a plate.

  The capacitor second electrode 62 is disposed on the second main surface 602 of the piezoelectric material section 60 so as to face the capacitor first electrode 61. Here, the capacitor second electrode 62 faces the capacitor first electrode 61 with the piezoelectric material portion 60 interposed therebetween in the thickness direction of the piezoelectric material portion 60. The capacitor second electrode 62 is larger than the capacitor first electrode 61 in a plan view from the thickness direction of the piezoelectric material portion 60, and overlaps the entire capacitor first electrode 61.

  In the particle adhesion preventing device 6, the capacitor first electrode 61, the capacitor second electrode 62 facing the capacitor first electrode 61, and the capacitor first electrode 61 and the capacitor second electrode of the piezoelectric material portion 60. 62 and a portion 603 interposed therebetween constitute a capacitor C6.

  In the particle adhesion preventing device 6, the capacitor first electrode 61 is disposed on the first main surface 601 so as to expose a part of the first main surface 601 of the piezoelectric material portion 60. Here, in the particle adhesion preventing device 6, an exposed portion of the first main surface 601 of the piezoelectric material portion 60 forms a pressure receiving surface 64 that receives gas pressure. In short, in the particle adhesion preventing device 6, the first electrode 61 for the capacitor is formed on the first main surface 601 so as to expose a part of the first main surface 601 of the piezoelectric material portion 60 as the pressure receiving surface 64 that receives the pressure of gas. Are located in

  In the particle adhesion preventing device 6, when the pressure of the gas is received on the pressure receiving surface 64, the piezoelectric material portion 60 generates a positive charge and a negative charge by the piezoelectric effect. In the particle adhesion preventing device 6, the capacitor first electrode 61 collects positive charges generated in the piezoelectric material portion 60. The capacitor second electrode 62 collects negative charges generated in the piezoelectric material section 60.

  The discharge electrode 63 protrudes from the capacitor first electrode 61 to the side opposite to the piezoelectric material portion 60 side, and has a sharp tip. The shape of the discharge electrode 63 is needle-like. The shape of the discharge electrode 63 is not limited to a needle shape, and may be, for example, a conical shape (a conical shape, a quadrangular pyramid shape, etc.). The material of the discharge electrode 63 is, for example, a metal or an alloy.

  The particle adhesion preventing device 6 includes a plurality of capacitor first electrodes 61. Here, the capacitor first electrode 61 has a long shape in plan view from the thickness direction of the piezoelectric material portion 60. The plurality of capacitor first electrodes 61 are arranged in a stripe pattern on the first main surface 601 of the piezoelectric material portion 60. Accordingly, in the particle adhesion preventing device 6, the plurality of first electrodes 61 for capacitors and the plurality of pressure receiving surfaces 64 are orthogonal to the thickness direction of the piezoelectric material portion 60 in a plan view from the thickness direction of the piezoelectric material portion 60. Are arranged alternately in one direction. The plurality of capacitor first electrodes 61 are arranged at equal intervals in the one direction. The “equal intervals” here need not be exactly the same intervals, and may be intervals within the second specified range (second specified distance ± 20%). In the particle adhesion preventing device 6, the capacitor second electrode 62 covers the entire surface of the second main surface 602 of the piezoelectric material portion 60. In the particle adhesion preventing device 6, one capacitor second electrode 62 overlaps the plurality of capacitor first electrodes 61 and the plurality of pressure receiving surfaces 64 in the thickness direction of the piezoelectric material portion 60.

  Further, the particle adhesion preventing device 6 includes a plurality of discharging electrodes 63 with respect to the first electrode 61 for the capacitor. The plurality of discharge electrodes 63 are arranged, for example, at equal intervals in the longitudinal direction of the first capacitor electrode 61, but are not limited thereto. For example, they may be arranged randomly or staggered. May be.

  In the separation system 100 including the particle adhesion preventing device 6, the particle adhesion preventing device 6 is provided, for example, on the cover 10. More specifically, the particle adhesion preventing device 6 is disposed on the inner peripheral surface 106 of the cover 10. The particle adhesion preventing device 6 is separated from the cylinder 2. Each discharge electrode 63 in the particle adhesion preventing device 6 is located between the first capacitor electrode 61 and the cylindrical body 2. Here, each discharge electrode 63 is separated from the cylinder 2 of the cyclone 1. In the particle adhesion preventing device 6, the longitudinal direction of the first electrode 61 for the capacitor is arranged so as to be parallel to one radial direction of the cylindrical body 2. However, the present invention is not limited to this. It may be arranged so that the longitudinal direction is parallel to the central axis 20 of the cylinder 2.

  The pressure of the gas received on the pressure receiving surface 64 of the piezoelectric material portion 60 in the particle adhesion preventing device 6 is, for example, the pressure of the gas discharged from the discharge hole 25 of the cylinder 2 of the cyclone 1. In other words, the particle adhesion preventing device 6 is arranged so that the pressure (wind pressure) of the gas discharged from the discharge hole 25 of the cylinder 2 can be received by the pressure receiving surface 64. Thus, when the pressure (wind pressure) of the gas discharged from the discharge hole 25 of the cylindrical body 2 is received on the pressure receiving surface 64, the particle adhesion preventing device 6 generates a positive charge and a negative charge by the piezoelectric effect. Can occur. The separation system 100 includes a plurality (four) of the particle adhesion preventing devices 6. The four particle adhesion preventing devices 6 are arranged one by one on four inner surfaces constituting the inner peripheral surface 106 of the cover 10.

  As shown in FIG. 7A, when the pressure (wind pressure) of the gas discharged from the discharge hole 25 of the cylindrical body 2 is received by the pressure receiving surface 64, the particle adhesion preventing device 6 generates a positive charge and a negative charge by the piezoelectric effect. Generates a charge. Positive charges generated in the piezoelectric material section 60 are collected by the first electrode 61 for the capacitor. The negative charges generated in the piezoelectric material part 60 are collected by the capacitor second electrode 62. In FIG. 7A, the wind pressure applied to the pressure receiving surface 64 is indicated by a white arrow. In the particle adhesion preventing device 6, for example, as shown in FIG. 7B, positively charged particles 161 (positively charged particles among a plurality of particles contained in the gas discharged from the discharge hole 25 of the cylinder 2) are formed. When approaching the tip of the discharge electrode 63, the negative charges that have been attracted to the surface of the capacitor first electrode 61 are attracted to the tip of the discharge electrode 63. Then, the electric field concentrates near the tip of the discharge electrode 63, and discharge (corona discharge) occurs, and negative ions are generated. Then, the negative ions and the positive charges charged on the particles 161 are neutralized, and the particles 161 are discharged. This makes it difficult for the particles 161 to adhere to the particle adhesion preventing device 6, the exposed portion of the inner peripheral surface 106 of the cover 10, and the like. In the particle adhesion preventing device 6, the electric charge of the piezoelectric material portion 60 is replenished by receiving the gas pressure on the pressure receiving surface 64 of the piezoelectric material portion 60. Therefore, the particle adhesion preventing device 6 can neutralize the electric charge of the charged particles 161 contained in the gas by using the energy of the gas from the cyclone 1 without requiring the power supply from the power supply.

  The particle adhesion preventing device 6 according to the first embodiment described above includes the piezoelectric material portion 60, the first electrode 61 for a capacitor, the second electrode 62 for a capacitor, and the electrode 63 for discharging. The piezoelectric material section 60 has a first main surface 601 and a second main surface 602. The piezoelectric material part 60 has piezoelectricity. The capacitor first electrode 61 is disposed on the first main surface 601 so as to expose a part of the first main surface 601 of the piezoelectric material portion 60 as a pressure receiving surface 64 that receives gas pressure. The capacitor first electrode 61 collects positive charges generated in the piezoelectric material portion 60. The capacitor second electrode 62 is disposed on the second main surface 602 of the piezoelectric material section 60 so as to face the capacitor first electrode 61. The capacitor second electrode 62 collects negative charges generated in the piezoelectric material section 60. The discharge electrode 63 protrudes from the capacitor first electrode 61 to the side opposite to the piezoelectric material portion 60 side, and has a sharp tip. With the above configuration, the particle adhesion preventing device 6 according to the first embodiment can prevent the adhesion of particles.

  Further, the separation system 100 includes the cyclone 1, the cover 10, the exhaust device 13, and the particle adhesion preventing device 6. The cyclone 1 has an inlet 23, an outlet 24, and a discharge hole 25. The cyclone 1 discharges the particles from the discharge holes 25 using centrifugal force generated in the particles in the gas by the swirling flow of the gas flowing in from the inlet 23 and flowing out from the outlet 24. The cover 10 has a first opening 103 and a second opening 104 corresponding to the inlet 23 and the outlet 24, respectively, and an exhaust hole 105. The cover 10 surrounds the cyclone 1. The particle adhesion preventing device 6 is disposed so that the first main surface 601 of the first main surface 601 and the second main surface 602 of the piezoelectric material portion 60 faces the cyclone 1 (opposes the cyclone 1).

  In the separation system 100, adhesion of particles can be prevented. Thereby, in the separation system 100, it is possible to improve the separation efficiency, which is one of the separation performances.

  Further, the separation system 100 further includes an exhaust device 13. In the separation system 100, when the gas and particles in the cover 10 are naturally exhausted from the exhaust holes 105 without providing the exhaust device 13, the gas and particles in the cover 10 are exhausted from the cyclone 1 into the cover 10 because the amount of exhaust from the exhaust holes 105 is small. Solids easily stay. On the other hand, by providing the exhaust system 13, the separation system 100 can suck the gas and particles exhausted into the cover 10 from the exhaust holes 25 of the cyclone 1 by the exhaust system 13. Solids are less likely to stay than in the case where the exhaust device 13 is not provided. Thereby, in the separation system 100, it is possible to further improve the separation efficiency.

(Embodiment 2)
Hereinafter, a particle adhesion preventing device 6a according to the second embodiment and a separation system 100a including the same will be described with reference to FIGS. 8A and 8B. The basic configurations of the particle adhesion preventing device 6a according to the second embodiment and the separation system 100a including the same are the same as those of the particle adhesion prevention device 6 according to the first embodiment and the separation system 100 including the same. Are denoted by the same reference numerals and description thereof is omitted.

  In the separation system 100a, the cover 10a has conductivity and doubles as the capacitor second electrode 62a of the particle adhesion preventing device 6a. In other words, the capacitor second electrode 62a of the particle adhesion preventing device 6a is configured by the cover 10a of the separation system 100a. The material of the cover 10a is, for example, aluminum, stainless steel, or the like.

  The particle adhesion preventing device 6a according to the second embodiment includes a piezoelectric material portion 60, a first capacitor electrode 61, a second capacitor electrode 62a, and a discharge electrode 63. The piezoelectric material section 60 has a first main surface 601 and a second main surface 602. The piezoelectric material part 60 has piezoelectricity. The capacitor first electrode 61 is disposed on the first main surface 601 so as to expose a part of the first main surface 601 of the piezoelectric material portion 60 as a pressure receiving surface 64 that receives gas pressure. The capacitor first electrode 61 collects positive charges generated in the piezoelectric material portion 60. The capacitor second electrode 62 a is arranged on the second main surface 602 of the piezoelectric material section 60 so as to face the capacitor first electrode 61. The capacitor second electrode 62a collects negative charges generated in the piezoelectric material portion 60. The discharge electrode 63 protrudes from the capacitor first electrode 61 to the side opposite to the piezoelectric material portion 60 side, and has a sharp tip.

  Therefore, the particle adhesion preventing device 6a and the separation system 100a including the same can prevent the particles from adhering.

  Embodiments 1 and 2 are only one of various embodiments of the present disclosure. Various changes can be made to the first and second embodiments according to the design and the like as long as the object of the present disclosure can be achieved.

(Modification)
For example, the particle adhesion preventing devices 6 and 6a include a plurality of capacitor first electrodes 61. However, the number of capacitor first electrodes 61 in the particle adhesion preventing devices 6 and 6a is not limited to a plurality and may be one. Good.

  In addition, in the particle adhesion preventing devices 6 and 6a, a plurality of discharge electrodes 63 are provided for the first capacitor electrode 61, but the number of discharge electrodes 63 provided for the first capacitor electrode 61 is plural. The number is not limited to one and may be one.

  In the particle adhesion preventing device 6, the capacitor second electrode 62 may have the same size as the capacitor first electrode 61 in a plan view from the thickness direction of the piezoelectric material portion 60.

  Further, in the cyclone 1, not only the entire discharge hole 25 is formed in a slit shape elongated in a direction inclined with respect to a direction parallel to the rotation center axis 30, but for example, at least a part of the discharge hole 25 is rotated. Any slit shape may be used as long as it is elongated in a direction inclined with respect to a direction parallel to the central axis 30.

  The discharge hole 25 is not limited to the case where the discharge hole 25 is formed from the first end 21 to the second end 22 of the cylinder 2, and may be, for example, a central portion of the cylinder 2 in a direction along the central axis 20 of the cylinder 2. From the first end 21 to the center in the direction along the central axis 20 of the cylindrical body 2.

  Further, in the cyclone 1, the cylindrical body 2 has a plurality of discharge holes 25, but the number of the discharge holes 25 is not limited to plural, and may be one, for example.

  Further, the plurality of discharge holes 25 are not limited to the case where they are arranged at equal intervals in the circumferential direction of the cylindrical body 2 and may be at irregular intervals.

  The material of the rotating body 3 and the plurality of blades 36 is not limited to a synthetic resin such as a polycarbonate resin, but may be a metal or the like. Further, the material of the rotating body 3 and the material of the plurality of blades 36 may be different from each other.

  Each of the plurality of blades 36 may be formed as a separate member from the rotating body 3 and fixed to the rotating body 3 to be connected to the rotating body 3.

  Further, each of the plurality of blades 36 may be spirally formed around the rotation center axis 30 of the rotating body 3. Here, the “spiral shape” is not limited to a spiral shape having a rotation speed of 1 or more, but also includes a part of the spiral shape having a rotation speed of 1.

  The rotating body 3 is not limited to the configuration including the two rotating members 3a and 3b arranged in the direction along the center axis 20 of the cylindrical body 2, but includes, for example, only one of the two rotating members 3a and 3b. May be. The rotating body 3 may include at least one rotating member (a rotating member having the same shape as the rotating member 3b) between the two rotating members 3a and 3b. In this case, it is preferable that a blade member forming a part of each of the plurality of blades 36 is also connected to the rotation member between the two rotation members 3a and 3b.

  The number of the blades 36 in the cyclone 1 is not limited to a plurality, and may be, for example, one.

  Further, in the separation systems 100 and 100a, the driving device for driving the rotating body 3 includes the motor 4 and the driving circuit, but is not limited thereto. For example, in addition to the motor and the driving circuit, a pulley and a rotation A belt may be included.

  Further, the cyclone 1 is not limited to a mechanical rotary cyclone having a configuration in which one or a plurality of blades 36 are connected to the rotating body 3. For example, the cyclone 1 includes a solid in the cylindrical body 2 in a tangential direction of the cylindrical body 2. A tangential inflow cyclone for inflow of gas or an axial flow cyclone using a swirler blade may be used.

  Further, the shape of the covers 10, 10a is not limited to a rectangular tube shape, and may be, for example, a cylindrical shape.

  In the separation systems 100 and 100a, the covers 10 and 10a may include a plurality of exhaust holes 105 and a plurality of exhaust ducts 108. The plurality of exhaust ducts 108 correspond to the plurality of exhaust holes 105, respectively. Thereby, in the separation systems 100 and 100a, the separation performance can be improved as compared with the case where only one combination of the exhaust hole 105 and the exhaust duct 108 is provided.

  Further, the separation systems 100 and 100a may further include a collector into which the solid discharged through the exhaust device 13 enters.

  Further, the exhaust device 13 is not limited to a fan, and may be configured by, for example, an exhaust pump and a valve.

The separation systems 100 and 100a may further include a control device that controls the exhaust device 13. In this case, the fan 131 can adjust the exhaust amount by controlling the intake amount under the control of the control device. The separation systems 100 and 100a further include a pressure sensor for measuring the pressure (gauge pressure) in the covers 10 and 10a, and the control device controls the exhaust of the exhaust device so that the measured value of the pressure sensor falls within a predetermined range. It may be configured to control the amount. The predetermined range is determined, for example, in a simulation so that the separation efficiency of particles having a predetermined particle size (for example, 2.5 μm) in the separation systems 100 and 100a is equal to or more than a desired value (for example, 60%). preferable. In the separation systems 100 and 100a, the exhaust device 13 is controlled such that the outflow amount per unit time of the gas flowing from the inlet 23 of the cyclone 1 and flowing out of the outlet 24 becomes a predetermined amount (for example, 250 m ³ / h). Is smaller than the amount of inflow per unit time flowing into the inlet 23 of the cyclone 1. In order to keep the cyclone 1 outflow amount at a predetermined amount even when the exhaust amount in the exhaust device 13 is changed, it is necessary to change the inflow amount of the cyclone 1 according to the exhaust amount, and the inflow amount increases as the exhaust amount increases. Is preferred. When the inflow amount of the cyclone 1 is determined, it is preferable to set the exhaust amount according to the difference between the inflow amount and the outflow amount. The predetermined range is, for example, a range including the atmospheric pressure. The upper limit value (first threshold value) of the predetermined range is, for example, a value corresponding to a predetermined positive pressure. The lower limit value (second threshold value) of the predetermined range is, for example, a value corresponding to a predetermined negative pressure.

(Summary)
The following aspects are disclosed from the embodiments and the like described above.

  The particle adhesion preventing device (6; 6a) according to the first aspect includes a piezoelectric material part (60), a first capacitor electrode (61), a second capacitor electrode (62; 62a), and a discharge electrode. (63). The piezoelectric material part (60) has a first main surface (601) and a second main surface (602). The piezoelectric material part (60) has piezoelectricity. The first electrode (61) for the capacitor is configured such that a part of the first main surface (601) of the piezoelectric material portion (60) is exposed as a pressure receiving surface (64) that receives gas pressure. Is placed on top. The first electrode for a capacitor (61) collects positive charges generated in the piezoelectric material section (60). The capacitor second electrode (62; 62a) is disposed on the second main surface (602) of the piezoelectric material portion (60) so as to face the capacitor first electrode (61). The capacitor second electrode (62; 62a) collects negative charges generated in the piezoelectric material section (60). The discharge electrode (63) protrudes from the capacitor first electrode (61) to the side opposite to the piezoelectric material portion (60) side and has a sharp tip.

  In the particle adhesion preventing device (6; 6a) according to the first aspect, it is possible to prevent particle adhesion.

  The particle adhesion preventing device (6; 6a) according to the second aspect, in the first aspect, includes a plurality of capacitor first electrodes (61).

  In the particle adhesion preventing device (6; 6a) according to the second aspect, it is possible to further prevent the particle adhesion.

  A particle adhesion preventing device (6; 6a) according to a third aspect, in the first or second aspect, includes a plurality of discharge electrodes (63) with respect to the capacitor first electrode (61).

  In the particle adhesion preventing device (6; 6a) according to the third aspect, compared to the case where the area of the capacitor first electrode (61) is the same and the number of discharge electrodes (63) is one, the particle adhesion is further reduced. This can be prevented.

  A separation system (100; 100a) according to a fourth aspect is a cyclone (1), a cover (10; 10a), an exhaust device (13), and particle adhesion prevention of any one of the first to third aspects. Device (6; 6a). The cyclone (1) has an inlet (23), an outlet (24), and a discharge hole (25). The cyclone (1) discharges particles from a discharge hole (25) by utilizing centrifugal force generated in particles in the gas by a swirling flow of gas flowing in from an inlet (23) and flowing out from an outlet (24). The cover (10; 10a) has a first opening (103) and a second opening (104) corresponding to an inlet (23) and an outlet (24), respectively, and an exhaust hole (105). The cover (10; 10a) surrounds the cyclone (1). In the particle adhesion preventing device (6; 6a), the first main surface (601) of the first main surface (601) and the second main surface (602) of the piezoelectric material portion (60) faces the cyclone (1). Are arranged as follows.

  In the separation system (100; 100a) according to the fourth aspect, it is possible to prevent the adhesion of particles.

  In the separation system (100) according to the fifth aspect, in the fourth aspect, the particle adhesion preventing device (6) is disposed on the inner peripheral surface (106) of the cover (10).

  In the separation system (100) according to the fifth aspect, it is possible to prevent particles from adhering to the particle adhesion preventing device (6) and the inner peripheral surface (106) of the cover (10).

  In the separation system (100a) according to the sixth aspect, in the fourth aspect, the cover (10a) has conductivity, and also serves as the second electrode for a capacitor (62a) of the particle adhesion preventing device (6a). I have.

  In the separation system (100a) according to the sixth aspect, it is possible to prevent particles from adhering to the inner peripheral surface (106) of the particle adhesion preventing device (6a) and the cover (10a).

  The separation system (100; 100a) according to the seventh aspect, in any one of the fourth to sixth aspects, provides an exhaust device (13) that exhausts the inside of the cover (10; 10a) through the exhaust hole (105). ) Is further provided.

  In the separation system (100; 100a) according to the seventh aspect, the separation efficiency can be improved as compared with the case where natural exhaust is performed from the exhaust hole (105).

  In the separation system according to the eighth aspect, in any one of the fourth to seventh aspects, the cyclone (1) includes a cylinder (2), a rotating body (3), a blade (36), and a motor. (4). The cylinder (2) is cylindrical and has an inlet (23) at a first end (21) and an outlet (24) at a second end (22). The rotating body (3) is disposed inside the cylindrical body (2) such that the rotation center axis (30) is aligned with the central axis (20) of the cylindrical body (2). The blade (36) is disposed between the rotating body (3) and the cylindrical body (2), and is provided integrally with the rotating body (3) among the rotating body (3) and the cylindrical body (2). ing. The motor (4) rotates the rotating body (3) around the rotation center axis (30). The discharge hole (25) penetrates in the thickness direction of the cylinder (2) between the first end (21) and the second end (22) of the cylinder (2).

  In the separation system (100; 100a) according to the eighth aspect, the solid that is swirling in the cylinder (2) between the first end (21) and the second end (22) of the cylinder (2). Can be discharged from the discharge hole (25).

  In the separation system (100; 100a) according to the ninth aspect, in the eighth aspect, the cyclone (1) has a plurality of blades (36). The plurality of blades (36) are spaced apart in the circumferential direction of the rotating body (3).

  In the separation system (100; 100a) according to the ninth aspect, the separation performance can be improved as compared with the case where the cyclone (1) has one blade (36).

DESCRIPTION OF SYMBOLS 1 Cyclone 2 cylinder 20 center axis 21 1st end 22 2nd end 23 inflow port 24 outflow port 25 discharge hole 3 rotating body 30 rotation center axis 31 1st end 32 2nd end 36 blade 4 motor 6, 6a Prevention of particle adhesion Apparatus 60 Piezoelectric material part 601 First main surface 602 Second main surface 603 Part of piezoelectric material part interposed between first electrode for capacitor and second electrode for capacitor 61 First electrode for capacitor 62 Second for capacitor Electrode 63 Discharge electrode 64 Pressure receiving surface 10, 10a Cover 103 First opening 104 Second opening 105 Exhaust hole 106 Inner peripheral surface 13 Exhaust device 100, 100a Separation system C6 Capacitor

Claims (9)

A piezoelectric material portion having a first main surface and a second main surface and having piezoelectricity;
The piezoelectric material portion is disposed on the first main surface so as to expose a part of the first main surface as a pressure receiving surface that receives gas pressure, and collects positive charges generated in the piezoelectric material portion. A first electrode for a capacitor,
A second electrode for a capacitor, which is arranged on the second main surface of the piezoelectric material portion so as to face the first electrode for the capacitor, and collects negative charges generated in the piezoelectric material portion;
A discharge electrode projecting from the first electrode for the capacitor to the side opposite to the piezoelectric material portion side and having a sharp tip.
Particle adhesion prevention device. Comprising a plurality of first electrodes for the capacitor,
The particle adhesion preventing device according to claim 1. For the capacitor first electrode, a plurality of the discharge electrodes are provided,
The particle adhesion preventing device according to claim 1. The device has an inlet, an outlet, and a discharge hole, and discharges particles from the discharge hole using centrifugal force generated in particles in the gas by a swirling flow of gas flowing in from the inlet and flowing out from the outlet. With a cyclone,
A cover having a first opening and a second opening respectively corresponding to the inflow port and the outflow port, and an exhaust hole, surrounding the cyclone;
A device for preventing particle adhesion according to any one of claims 1 to 3, comprising:
The particle adhesion preventing device is disposed so that the first main surface of the first main surface and the second main surface of the piezoelectric material portion faces the cyclone,
Separation system. The particle adhesion preventing device is disposed on an inner peripheral surface of the cover.
The separation system according to claim 4. The cover has conductivity, and also serves as the second electrode for the capacitor of the particle adhesion preventing device,
The separation system according to claim 4. Further comprising an exhaust device for exhausting the inside of the cover through the exhaust hole,
A separation system according to any one of claims 4 to 6. The cyclone is
A cylindrical tube having the inlet at a first end and the outlet at a second end;
Inside the cylindrical body, a rotating body arranged such that the rotation center axis is aligned with the central axis of the cylindrical body,
A blade that is disposed between the rotating body and the cylindrical body and that is provided integrally with the rotating body among the rotating body and the cylindrical body;
A motor that rotates the rotating body around the rotation center axis;
With
The discharge hole penetrates in a thickness direction of the cylindrical body between the first end and the second end of the cylindrical body,
A separation system according to any one of claims 4 to 7. The cyclone has a plurality of the blades,
The plurality of blades are spaced apart in a circumferential direction of the rotating body,
A separation system according to claim 8.

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